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19 <p class="apache">Apache HTTP Server Version 2.5</p>
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23 <a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.5</a> > <a href="./">Modules</a></div>
24 <div id="page-content">
25 <div id="preamble"><h1>Apache Module mod_ssl</h1>
27 <p><span>Available Languages: </span><a href="../en/mod/mod_ssl.html" title="English"> en </a></p>
29 <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Strong cryptography using the Secure Sockets
30 Layer (SSL) and Transport Layer Security (TLS) protocols</td></tr>
31 <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
32 <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>ssl_module</td></tr>
33 <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_ssl.c</td></tr></table>
36 <p>This module provides SSL v3 and TLS v1.x support for the Apache
37 HTTP Server. SSL v2 is no longer supported.</p>
39 <p>This module relies on <a href="http://www.openssl.org/">OpenSSL</a>
40 to provide the cryptography engine.</p>
42 <p>Further details, discussion, and examples are provided in the
43 <a href="../ssl/">SSL documentation</a>.</p>
45 <div id="quickview"><h3 class="directives">Directives</h3>
47 <li><img alt="" src="../images/down.gif" /> <a href="#sslcacertificatefile">SSLCACertificateFile</a></li>
48 <li><img alt="" src="../images/down.gif" /> <a href="#sslcacertificatepath">SSLCACertificatePath</a></li>
49 <li><img alt="" src="../images/down.gif" /> <a href="#sslcadnrequestfile">SSLCADNRequestFile</a></li>
50 <li><img alt="" src="../images/down.gif" /> <a href="#sslcadnrequestpath">SSLCADNRequestPath</a></li>
51 <li><img alt="" src="../images/down.gif" /> <a href="#sslcarevocationcheck">SSLCARevocationCheck</a></li>
52 <li><img alt="" src="../images/down.gif" /> <a href="#sslcarevocationfile">SSLCARevocationFile</a></li>
53 <li><img alt="" src="../images/down.gif" /> <a href="#sslcarevocationpath">SSLCARevocationPath</a></li>
54 <li><img alt="" src="../images/down.gif" /> <a href="#sslcertificatechainfile">SSLCertificateChainFile</a></li>
55 <li><img alt="" src="../images/down.gif" /> <a href="#sslcertificatefile">SSLCertificateFile</a></li>
56 <li><img alt="" src="../images/down.gif" /> <a href="#sslcertificatekeyfile">SSLCertificateKeyFile</a></li>
57 <li><img alt="" src="../images/down.gif" /> <a href="#sslciphersuite">SSLCipherSuite</a></li>
58 <li><img alt="" src="../images/down.gif" /> <a href="#sslcompression">SSLCompression</a></li>
59 <li><img alt="" src="../images/down.gif" /> <a href="#sslcryptodevice">SSLCryptoDevice</a></li>
60 <li><img alt="" src="../images/down.gif" /> <a href="#sslengine">SSLEngine</a></li>
61 <li><img alt="" src="../images/down.gif" /> <a href="#sslfips">SSLFIPS</a></li>
62 <li><img alt="" src="../images/down.gif" /> <a href="#sslhonorcipherorder">SSLHonorCipherOrder</a></li>
63 <li><img alt="" src="../images/down.gif" /> <a href="#sslinsecurerenegotiation">SSLInsecureRenegotiation</a></li>
64 <li><img alt="" src="../images/down.gif" /> <a href="#sslocspdefaultresponder">SSLOCSPDefaultResponder</a></li>
65 <li><img alt="" src="../images/down.gif" /> <a href="#sslocspenable">SSLOCSPEnable</a></li>
66 <li><img alt="" src="../images/down.gif" /> <a href="#sslocspoverrideresponder">SSLOCSPOverrideResponder</a></li>
67 <li><img alt="" src="../images/down.gif" /> <a href="#sslocsprespondertimeout">SSLOCSPResponderTimeout</a></li>
68 <li><img alt="" src="../images/down.gif" /> <a href="#sslocspresponsemaxage">SSLOCSPResponseMaxAge</a></li>
69 <li><img alt="" src="../images/down.gif" /> <a href="#sslocspresponsetimeskew">SSLOCSPResponseTimeSkew</a></li>
70 <li><img alt="" src="../images/down.gif" /> <a href="#sslocspuserequestnonce">SSLOCSPUseRequestNonce</a></li>
71 <li><img alt="" src="../images/down.gif" /> <a href="#sslopensslconfcmd">SSLOpenSSLConfCmd</a></li>
72 <li><img alt="" src="../images/down.gif" /> <a href="#ssloptions">SSLOptions</a></li>
73 <li><img alt="" src="../images/down.gif" /> <a href="#sslpassphrasedialog">SSLPassPhraseDialog</a></li>
74 <li><img alt="" src="../images/down.gif" /> <a href="#sslprotocol">SSLProtocol</a></li>
75 <li><img alt="" src="../images/down.gif" /> <a href="#sslproxycacertificatefile">SSLProxyCACertificateFile</a></li>
76 <li><img alt="" src="../images/down.gif" /> <a href="#sslproxycacertificatepath">SSLProxyCACertificatePath</a></li>
77 <li><img alt="" src="../images/down.gif" /> <a href="#sslproxycarevocationcheck">SSLProxyCARevocationCheck</a></li>
78 <li><img alt="" src="../images/down.gif" /> <a href="#sslproxycarevocationfile">SSLProxyCARevocationFile</a></li>
79 <li><img alt="" src="../images/down.gif" /> <a href="#sslproxycarevocationpath">SSLProxyCARevocationPath</a></li>
80 <li><img alt="" src="../images/down.gif" /> <a href="#sslproxycheckpeercn">SSLProxyCheckPeerCN</a></li>
81 <li><img alt="" src="../images/down.gif" /> <a href="#sslproxycheckpeerexpire">SSLProxyCheckPeerExpire</a></li>
82 <li><img alt="" src="../images/down.gif" /> <a href="#sslproxycheckpeername">SSLProxyCheckPeerName</a></li>
83 <li><img alt="" src="../images/down.gif" /> <a href="#sslproxyciphersuite">SSLProxyCipherSuite</a></li>
84 <li><img alt="" src="../images/down.gif" /> <a href="#sslproxyengine">SSLProxyEngine</a></li>
85 <li><img alt="" src="../images/down.gif" /> <a href="#sslproxymachinecertificatechainfile">SSLProxyMachineCertificateChainFile</a></li>
86 <li><img alt="" src="../images/down.gif" /> <a href="#sslproxymachinecertificatefile">SSLProxyMachineCertificateFile</a></li>
87 <li><img alt="" src="../images/down.gif" /> <a href="#sslproxymachinecertificatepath">SSLProxyMachineCertificatePath</a></li>
88 <li><img alt="" src="../images/down.gif" /> <a href="#sslproxyprotocol">SSLProxyProtocol</a></li>
89 <li><img alt="" src="../images/down.gif" /> <a href="#sslproxyverify">SSLProxyVerify</a></li>
90 <li><img alt="" src="../images/down.gif" /> <a href="#sslproxyverifydepth">SSLProxyVerifyDepth</a></li>
91 <li><img alt="" src="../images/down.gif" /> <a href="#sslrandomseed">SSLRandomSeed</a></li>
92 <li><img alt="" src="../images/down.gif" /> <a href="#sslrenegbuffersize">SSLRenegBufferSize</a></li>
93 <li><img alt="" src="../images/down.gif" /> <a href="#sslrequire">SSLRequire</a></li>
94 <li><img alt="" src="../images/down.gif" /> <a href="#sslrequiressl">SSLRequireSSL</a></li>
95 <li><img alt="" src="../images/down.gif" /> <a href="#sslsessioncache">SSLSessionCache</a></li>
96 <li><img alt="" src="../images/down.gif" /> <a href="#sslsessioncachetimeout">SSLSessionCacheTimeout</a></li>
97 <li><img alt="" src="../images/down.gif" /> <a href="#sslsessionticketkeyfile">SSLSessionTicketKeyFile</a></li>
98 <li><img alt="" src="../images/down.gif" /> <a href="#sslsessiontickets">SSLSessionTickets</a></li>
99 <li><img alt="" src="../images/down.gif" /> <a href="#sslsrpunknownuserseed">SSLSRPUnknownUserSeed</a></li>
100 <li><img alt="" src="../images/down.gif" /> <a href="#sslsrpverifierfile">SSLSRPVerifierFile</a></li>
101 <li><img alt="" src="../images/down.gif" /> <a href="#sslstaplingcache">SSLStaplingCache</a></li>
102 <li><img alt="" src="../images/down.gif" /> <a href="#sslstaplingerrorcachetimeout">SSLStaplingErrorCacheTimeout</a></li>
103 <li><img alt="" src="../images/down.gif" /> <a href="#sslstaplingfaketrylater">SSLStaplingFakeTryLater</a></li>
104 <li><img alt="" src="../images/down.gif" /> <a href="#sslstaplingforceurl">SSLStaplingForceURL</a></li>
105 <li><img alt="" src="../images/down.gif" /> <a href="#sslstaplingrespondertimeout">SSLStaplingResponderTimeout</a></li>
106 <li><img alt="" src="../images/down.gif" /> <a href="#sslstaplingresponsemaxage">SSLStaplingResponseMaxAge</a></li>
107 <li><img alt="" src="../images/down.gif" /> <a href="#sslstaplingresponsetimeskew">SSLStaplingResponseTimeSkew</a></li>
108 <li><img alt="" src="../images/down.gif" /> <a href="#sslstaplingreturnrespondererrors">SSLStaplingReturnResponderErrors</a></li>
109 <li><img alt="" src="../images/down.gif" /> <a href="#sslstaplingstandardcachetimeout">SSLStaplingStandardCacheTimeout</a></li>
110 <li><img alt="" src="../images/down.gif" /> <a href="#sslstrictsnivhostcheck">SSLStrictSNIVHostCheck</a></li>
111 <li><img alt="" src="../images/down.gif" /> <a href="#sslusername">SSLUserName</a></li>
112 <li><img alt="" src="../images/down.gif" /> <a href="#sslusestapling">SSLUseStapling</a></li>
113 <li><img alt="" src="../images/down.gif" /> <a href="#sslverifyclient">SSLVerifyClient</a></li>
114 <li><img alt="" src="../images/down.gif" /> <a href="#sslverifydepth">SSLVerifyDepth</a></li>
118 <li><img alt="" src="../images/down.gif" /> <a href="#envvars">Environment Variables</a></li>
119 <li><img alt="" src="../images/down.gif" /> <a href="#logformats">Custom Log Formats</a></li>
120 <li><img alt="" src="../images/down.gif" /> <a href="#notes">Request Notes</a></li>
121 <li><img alt="" src="../images/down.gif" /> <a href="#authzproviders">Authorization providers for use with Require</a></li>
122 </ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
123 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
124 <div class="section">
125 <h2><a name="envvars" id="envvars">Environment Variables</a></h2>
127 <p>This module can be configured to provide several items of SSL information
128 as additional environment variables to the SSI and CGI namespace. This
129 information is not provided by default for performance reasons. (See
130 <code class="directive">SSLOptions</code> StdEnvVars, below.) The generated variables
131 are listed in the table below. For backward compatibility the information can
132 be made available under different names, too. Look in the <a href="../ssl/ssl_compat.html">Compatibility</a> chapter for details on the
133 compatibility variables.</p>
135 <table class="bordered">
138 <th><a name="table3">Variable Name:</a></th>
140 <th>Description:</th>
142 <tr><td><code>HTTPS</code></td> <td>flag</td> <td>HTTPS is being used.</td></tr>
143 <tr><td><code>SSL_PROTOCOL</code></td> <td>string</td> <td>The SSL protocol version (SSLv3, TLSv1, TLSv1.1, TLSv1.2)</td></tr>
144 <tr><td><code>SSL_SESSION_ID</code></td> <td>string</td> <td>The hex-encoded SSL session id</td></tr>
145 <tr><td><code>SSL_SESSION_RESUMED</code></td> <td>string</td> <td>Initial or Resumed SSL Session. Note: multiple requests may be served over the same (Initial or Resumed) SSL session if HTTP KeepAlive is in use</td></tr>
146 <tr><td><code>SSL_SECURE_RENEG</code></td> <td>string</td> <td><code>true</code> if secure renegotiation is supported, else <code>false</code></td></tr>
147 <tr><td><code>SSL_CIPHER</code></td> <td>string</td> <td>The cipher specification name</td></tr>
148 <tr><td><code>SSL_CIPHER_EXPORT</code></td> <td>string</td> <td><code>true</code> if cipher is an export cipher</td></tr>
149 <tr><td><code>SSL_CIPHER_USEKEYSIZE</code></td> <td>number</td> <td>Number of cipher bits (actually used)</td></tr>
150 <tr><td><code>SSL_CIPHER_ALGKEYSIZE</code></td> <td>number</td> <td>Number of cipher bits (possible)</td></tr>
151 <tr><td><code>SSL_COMPRESS_METHOD</code></td> <td>string</td> <td>SSL compression method negotiated</td></tr>
152 <tr><td><code>SSL_VERSION_INTERFACE</code></td> <td>string</td> <td>The mod_ssl program version</td></tr>
153 <tr><td><code>SSL_VERSION_LIBRARY</code></td> <td>string</td> <td>The OpenSSL program version</td></tr>
154 <tr><td><code>SSL_CLIENT_M_VERSION</code></td> <td>string</td> <td>The version of the client certificate</td></tr>
155 <tr><td><code>SSL_CLIENT_M_SERIAL</code></td> <td>string</td> <td>The serial of the client certificate</td></tr>
156 <tr><td><code>SSL_CLIENT_S_DN</code></td> <td>string</td> <td>Subject DN in client's certificate</td></tr>
157 <tr><td><code>SSL_CLIENT_S_DN_</code><em>x509</em></td> <td>string</td> <td>Component of client's Subject DN</td></tr>
158 <tr><td><code>SSL_CLIENT_SAN_Email_</code><em>n</em></td> <td>string</td> <td>Client certificate's subjectAltName extension entries of type rfc822Name</td></tr>
159 <tr><td><code>SSL_CLIENT_SAN_DNS_</code><em>n</em></td> <td>string</td> <td>Client certificate's subjectAltName extension entries of type dNSName</td></tr>
160 <tr><td><code>SSL_CLIENT_I_DN</code></td> <td>string</td> <td>Issuer DN of client's certificate</td></tr>
161 <tr><td><code>SSL_CLIENT_I_DN_</code><em>x509</em></td> <td>string</td> <td>Component of client's Issuer DN</td></tr>
162 <tr><td><code>SSL_CLIENT_V_START</code></td> <td>string</td> <td>Validity of client's certificate (start time)</td></tr>
163 <tr><td><code>SSL_CLIENT_V_END</code></td> <td>string</td> <td>Validity of client's certificate (end time)</td></tr>
164 <tr><td><code>SSL_CLIENT_V_REMAIN</code></td> <td>string</td> <td>Number of days until client's certificate expires</td></tr>
165 <tr><td><code>SSL_CLIENT_A_SIG</code></td> <td>string</td> <td>Algorithm used for the signature of client's certificate</td></tr>
166 <tr><td><code>SSL_CLIENT_A_KEY</code></td> <td>string</td> <td>Algorithm used for the public key of client's certificate</td></tr>
167 <tr><td><code>SSL_CLIENT_CERT</code></td> <td>string</td> <td>PEM-encoded client certificate</td></tr>
168 <tr><td><code>SSL_CLIENT_CERT_CHAIN_</code><em>n</em></td> <td>string</td> <td>PEM-encoded certificates in client certificate chain</td></tr>
169 <tr><td><code>SSL_CLIENT_VERIFY</code></td> <td>string</td> <td><code>NONE</code>, <code>SUCCESS</code>, <code>GENEROUS</code> or <code>FAILED:</code><em>reason</em></td></tr>
170 <tr><td><code>SSL_SERVER_M_VERSION</code></td> <td>string</td> <td>The version of the server certificate</td></tr>
171 <tr><td><code>SSL_SERVER_M_SERIAL</code></td> <td>string</td> <td>The serial of the server certificate</td></tr>
172 <tr><td><code>SSL_SERVER_S_DN</code></td> <td>string</td> <td>Subject DN in server's certificate</td></tr>
173 <tr><td><code>SSL_SERVER_SAN_Email_</code><em>n</em></td> <td>string</td> <td>Server certificate's subjectAltName extension entries of type rfc822Name</td></tr>
174 <tr><td><code>SSL_SERVER_SAN_DNS_</code><em>n</em></td> <td>string</td> <td>Server certificate's subjectAltName extension entries of type dNSName</td></tr>
175 <tr><td><code>SSL_SERVER_S_DN_</code><em>x509</em></td> <td>string</td> <td>Component of server's Subject DN</td></tr>
176 <tr><td><code>SSL_SERVER_I_DN</code></td> <td>string</td> <td>Issuer DN of server's certificate</td></tr>
177 <tr><td><code>SSL_SERVER_I_DN_</code><em>x509</em></td> <td>string</td> <td>Component of server's Issuer DN</td></tr>
178 <tr><td><code>SSL_SERVER_V_START</code></td> <td>string</td> <td>Validity of server's certificate (start time)</td></tr>
179 <tr><td><code>SSL_SERVER_V_END</code></td> <td>string</td> <td>Validity of server's certificate (end time)</td></tr>
180 <tr><td><code>SSL_SERVER_A_SIG</code></td> <td>string</td> <td>Algorithm used for the signature of server's certificate</td></tr>
181 <tr><td><code>SSL_SERVER_A_KEY</code></td> <td>string</td> <td>Algorithm used for the public key of server's certificate</td></tr>
182 <tr><td><code>SSL_SERVER_CERT</code></td> <td>string</td> <td>PEM-encoded server certificate</td></tr>
183 <tr><td><code>SSL_SRP_USER</code></td> <td>string</td> <td>SRP username</td></tr>
184 <tr><td><code>SSL_SRP_USERINFO</code></td> <td>string</td> <td>SRP user info</td></tr>
185 <tr><td><code>SSL_TLS_SNI</code></td> <td>string</td> <td>Contents of the SNI TLS extension (if supplied with ClientHello)</td></tr>
188 <p><em>x509</em> specifies a component of an X.509 DN; one of
189 <code>C,ST,L,O,OU,CN,T,I,G,S,D,UID,Email</code>. In Apache 2.1 and
190 later, <em>x509</em> may also include a numeric <code>_n</code>
191 suffix. If the DN in question contains multiple attributes of the
192 same name, this suffix is used as a zero-based index to select a
193 particular attribute. For example, where the server certificate
194 subject DN included two OU attributes, <code>SSL_SERVER_S_DN_OU_0</code>
196 <code>SSL_SERVER_S_DN_OU_1</code> could be used to reference each. A
197 variable name without a <code>_n</code> suffix is equivalent to that
198 name with a <code>_0</code> suffix; the first (or only) attribute.
199 When the environment table is populated using
200 the <code>StdEnvVars</code> option of
201 the <code class="directive"><a href="#ssloptions">SSLOptions</a></code> directive, the
202 first (or only) attribute of any DN is added only under a non-suffixed
203 name; i.e. no <code>_0</code> suffixed entries are added.</p>
205 <p>The format of the <em>*_DN</em> variables has changed in Apache HTTPD
206 2.3.11. See the <code>LegacyDNStringFormat</code> option for
207 <code class="directive"><a href="#ssloptions">SSLOptions</a></code> for details.</p>
209 <p><code>SSL_CLIENT_V_REMAIN</code> is only available in version 2.1
212 <p>A number of additional environment variables can also be used
213 in <code class="directive">SSLRequire</code> expressions, or in custom log
216 <div class="note"><pre>HTTP_USER_AGENT PATH_INFO AUTH_TYPE
217 HTTP_REFERER QUERY_STRING SERVER_SOFTWARE
218 HTTP_COOKIE REMOTE_HOST API_VERSION
219 HTTP_FORWARDED REMOTE_IDENT TIME_YEAR
220 HTTP_HOST IS_SUBREQ TIME_MON
221 HTTP_PROXY_CONNECTION DOCUMENT_ROOT TIME_DAY
222 HTTP_ACCEPT SERVER_ADMIN TIME_HOUR
223 THE_REQUEST SERVER_NAME TIME_MIN
224 REQUEST_FILENAME SERVER_PORT TIME_SEC
225 REQUEST_METHOD SERVER_PROTOCOL TIME_WDAY
226 REQUEST_SCHEME REMOTE_ADDR TIME
227 REQUEST_URI REMOTE_USER</pre></div>
229 <p>In these contexts, two special formats can also be used:</p>
232 <dt><code>ENV:<em>variablename</em></code></dt>
233 <dd>This will expand to the standard environment
234 variable <em>variablename</em>.</dd>
236 <dt><code>HTTP:<em>headername</em></code></dt>
237 <dd>This will expand to the value of the request header with name
238 <em>headername</em>.</dd>
241 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
242 <div class="section">
243 <h2><a name="logformats" id="logformats">Custom Log Formats</a></h2>
245 <p>When <code class="module"><a href="../mod/mod_ssl.html">mod_ssl</a></code> is built into Apache or at least
246 loaded (under DSO situation) additional functions exist for the <a href="mod_log_config.html#formats">Custom Log Format</a> of
247 <code class="module"><a href="../mod/mod_log_config.html">mod_log_config</a></code>. First there is an
248 additional ``<code>%{</code><em>varname</em><code>}x</code>''
249 eXtension format function which can be used to expand any variables
250 provided by any module, especially those provided by mod_ssl which can
251 you find in the above table.</p>
253 For backward compatibility there is additionally a special
254 ``<code>%{</code><em>name</em><code>}c</code>'' cryptography format function
255 provided. Information about this function is provided in the <a href="../ssl/ssl_compat.html">Compatibility</a> chapter.</p>
256 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">CustomLog logs/ssl_request_log "%t %h %{SSL_PROTOCOL}x %{SSL_CIPHER}x \"%r\" %b"</pre>
258 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
259 <div class="section">
260 <h2><a name="notes" id="notes">Request Notes</a></h2>
262 <p><code class="module"><a href="../mod/mod_ssl.html">mod_ssl</a></code> sets "notes" for the request which can be
263 used in logging with the <code>%{<em>name</em>}n</code> format
264 string in <code class="module"><a href="../mod/mod_log_config.html">mod_log_config</a></code>.</p>
266 <p>The notes supported are as follows:</p>
269 <dt><code>ssl-access-forbidden</code></dt>
270 <dd>This note is set to the value <code>1</code> if access was
271 denied due to an <code class="directive">SSLRequire</code>
272 or <code class="directive">SSLRequireSSL</code> directive.</dd>
274 <dt><code>ssl-secure-reneg</code></dt>
275 <dd>If <code class="module"><a href="../mod/mod_ssl.html">mod_ssl</a></code> is built against a version of
276 OpenSSL which supports the secure renegotiation extension, this note
277 is set to the value <code>1</code> if SSL is in used for the current
278 connection, and the client also supports the secure renegotiation
279 extension. If the client does not support the secure renegotiation
280 extension, the note is set to the value <code>0</code>.
281 If <code class="module"><a href="../mod/mod_ssl.html">mod_ssl</a></code> is not built against a version of
282 OpenSSL which supports secure renegotiation, or if SSL is not in use
283 for the current connection, the note is not set.</dd>
286 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
287 <div class="section">
288 <h2><a name="authzproviders" id="authzproviders">Authorization providers for use with Require</a></h2>
290 <p><code class="module"><a href="../mod/mod_ssl.html">mod_ssl</a></code> provides a few authentication providers for use
291 with <code class="module"><a href="../mod/mod_authz_core.html">mod_authz_core</a></code>'s
292 <code class="directive"><a href="../mod/mod_authz_core.html#require">Require</a></code> directive.</p>
294 <h3><a name="reqssl" id="reqssl">Require ssl</a></h3>
296 <p>The <code>ssl</code> provider denies access if a connection is not
297 encrypted with SSL. This is similar to the
298 <code class="directive">SSLRequireSSL</code> directive.</p>
300 <pre class="prettyprint lang-config">Require ssl</pre>
305 <h3><a name="reqverifyclient" id="reqverifyclient">Require ssl-verify-client</a></h3>
307 <p>The <code>ssl</code> provider allows access if the user is
308 authenticated with a valid client certificate. This is only
309 useful if <code>SSLVerifyClient optional</code> is in effect.</p>
311 <p>The following example grants access if the user is authenticated
312 either with a client certificate or by username and password.</p>
314 <pre class="prettyprint lang-config"> Require ssl-verify-client<br />
315 Require valid-user</pre>
321 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
322 <div class="directive-section"><h2><a name="SSLCACertificateFile" id="SSLCACertificateFile">SSLCACertificateFile</a> <a name="sslcacertificatefile" id="sslcacertificatefile">Directive</a></h2>
323 <table class="directive">
324 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>File of concatenated PEM-encoded CA Certificates
325 for Client Auth</td></tr>
326 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLCACertificateFile <em>file-path</em></code></td></tr>
327 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
328 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
329 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
332 This directive sets the <em>all-in-one</em> file where you can assemble the
333 Certificates of Certification Authorities (CA) whose <em>clients</em> you deal
334 with. These are used for Client Authentication. Such a file is simply the
335 concatenation of the various PEM-encoded Certificate files, in order of
336 preference. This can be used alternatively and/or additionally to
337 <code class="directive"><a href="#sslcacertificatepath">SSLCACertificatePath</a></code>.</p>
338 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLCACertificateFile /usr/local/apache2/conf/ssl.crt/ca-bundle-client.crt</pre>
342 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
343 <div class="directive-section"><h2><a name="SSLCACertificatePath" id="SSLCACertificatePath">SSLCACertificatePath</a> <a name="sslcacertificatepath" id="sslcacertificatepath">Directive</a></h2>
344 <table class="directive">
345 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Directory of PEM-encoded CA Certificates for
346 Client Auth</td></tr>
347 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLCACertificatePath <em>directory-path</em></code></td></tr>
348 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
349 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
350 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
353 This directive sets the directory where you keep the Certificates of
354 Certification Authorities (CAs) whose clients you deal with. These are used to
355 verify the client certificate on Client Authentication.</p>
357 The files in this directory have to be PEM-encoded and are accessed through
358 hash filenames. So usually you can't just place the Certificate files
359 there: you also have to create symbolic links named
360 <em>hash-value</em><code>.N</code>. And you should always make sure this directory
361 contains the appropriate symbolic links.</p>
362 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLCACertificatePath /usr/local/apache2/conf/ssl.crt/</pre>
366 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
367 <div class="directive-section"><h2><a name="SSLCADNRequestFile" id="SSLCADNRequestFile">SSLCADNRequestFile</a> <a name="sslcadnrequestfile" id="sslcadnrequestfile">Directive</a></h2>
368 <table class="directive">
369 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>File of concatenated PEM-encoded CA Certificates
370 for defining acceptable CA names</td></tr>
371 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLCADNRequestFile <em>file-path</em></code></td></tr>
372 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
373 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
374 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
376 <p>When a client certificate is requested by mod_ssl, a list of
377 <em>acceptable Certificate Authority names</em> is sent to the client
378 in the SSL handshake. These CA names can be used by the client to
379 select an appropriate client certificate out of those it has
382 <p>If neither of the directives <code class="directive"><a href="#sslcadnrequestpath">SSLCADNRequestPath</a></code> or <code class="directive"><a href="#sslcadnrequestfile">SSLCADNRequestFile</a></code> are given, then the
383 set of acceptable CA names sent to the client is the names of all the
384 CA certificates given by the <code class="directive"><a href="#sslcacertificatefile">SSLCACertificateFile</a></code> and <code class="directive"><a href="#sslcacertificatepath">SSLCACertificatePath</a></code> directives; in other
385 words, the names of the CAs which will actually be used to verify the
386 client certificate.</p>
388 <p>In some circumstances, it is useful to be able to send a set of
389 acceptable CA names which differs from the actual CAs used to verify
390 the client certificate - for example, if the client certificates are
391 signed by intermediate CAs. In such cases, <code class="directive"><a href="#sslcadnrequestpath">SSLCADNRequestPath</a></code> and/or <code class="directive"><a href="#sslcadnrequestfile">SSLCADNRequestFile</a></code> can be used; the
392 acceptable CA names are then taken from the complete set of
393 certificates in the directory and/or file specified by this pair of
396 <p><code class="directive"><a href="#sslcadnrequestfile">SSLCADNRequestFile</a></code> must
397 specify an <em>all-in-one</em> file containing a concatenation of
398 PEM-encoded CA certificates.</p>
400 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLCADNRequestFile /usr/local/apache2/conf/ca-names.crt</pre>
404 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
405 <div class="directive-section"><h2><a name="SSLCADNRequestPath" id="SSLCADNRequestPath">SSLCADNRequestPath</a> <a name="sslcadnrequestpath" id="sslcadnrequestpath">Directive</a></h2>
406 <table class="directive">
407 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Directory of PEM-encoded CA Certificates for
408 defining acceptable CA names</td></tr>
409 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLCADNRequestPath <em>directory-path</em></code></td></tr>
410 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
411 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
412 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
415 <p>This optional directive can be used to specify the set of
416 <em>acceptable CA names</em> which will be sent to the client when a
417 client certificate is requested. See the <code class="directive"><a href="#sslcadnrequestfile">SSLCADNRequestFile</a></code> directive for more
420 <p>The files in this directory have to be PEM-encoded and are accessed
421 through hash filenames. So usually you can't just place the
422 Certificate files there: you also have to create symbolic links named
423 <em>hash-value</em><code>.N</code>. And you should always make sure
424 this directory contains the appropriate symbolic links.</p>
425 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLCADNRequestPath /usr/local/apache2/conf/ca-names.crt/</pre>
429 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
430 <div class="directive-section"><h2><a name="SSLCARevocationCheck" id="SSLCARevocationCheck">SSLCARevocationCheck</a> <a name="sslcarevocationcheck" id="sslcarevocationcheck">Directive</a></h2>
431 <table class="directive">
432 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable CRL-based revocation checking</td></tr>
433 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLCARevocationCheck chain|leaf|none</code></td></tr>
434 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLCARevocationCheck none</code></td></tr>
435 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
436 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
437 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
440 Enables certificate revocation list (CRL) checking. At least one of
441 <code class="directive"><a href="#sslcarevocationfile">SSLCARevocationFile</a></code>
442 or <code class="directive"><a href="#sslcarevocationpath">SSLCARevocationPath</a></code> must be
443 configured. When set to <code>chain</code> (recommended setting),
444 CRL checks are applied to all certificates in the chain, while setting it to
445 <code>leaf</code> limits the checks to the end-entity cert.
448 <h3>When set to <code>chain</code> or <code>leaf</code>,
449 CRLs <em>must</em> be available for successful validation</h3>
451 Prior to version 2.3.15, CRL checking in mod_ssl also succeeded when
452 no CRL(s) were found in any of the locations configured with
453 <code class="directive"><a href="#sslcarevocationfile">SSLCARevocationFile</a></code>
454 or <code class="directive"><a href="#sslcarevocationpath">SSLCARevocationPath</a></code>.
455 With the introduction of this directive, the behavior has been changed:
456 when checking is enabled, CRLs <em>must</em> be present for the validation
457 to succeed - otherwise it will fail with an
458 <code>"unable to get certificate CRL"</code> error.
461 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLCARevocationCheck chain</pre>
465 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
466 <div class="directive-section"><h2><a name="SSLCARevocationFile" id="SSLCARevocationFile">SSLCARevocationFile</a> <a name="sslcarevocationfile" id="sslcarevocationfile">Directive</a></h2>
467 <table class="directive">
468 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>File of concatenated PEM-encoded CA CRLs for
469 Client Auth</td></tr>
470 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLCARevocationFile <em>file-path</em></code></td></tr>
471 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
472 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
473 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
476 This directive sets the <em>all-in-one</em> file where you can
477 assemble the Certificate Revocation Lists (CRL) of Certification
478 Authorities (CA) whose <em>clients</em> you deal with. These are used
479 for Client Authentication. Such a file is simply the concatenation of
480 the various PEM-encoded CRL files, in order of preference. This can be
481 used alternatively and/or additionally to <code class="directive"><a href="#sslcarevocationpath">SSLCARevocationPath</a></code>.</p>
482 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLCARevocationFile /usr/local/apache2/conf/ssl.crl/ca-bundle-client.crl</pre>
486 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
487 <div class="directive-section"><h2><a name="SSLCARevocationPath" id="SSLCARevocationPath">SSLCARevocationPath</a> <a name="sslcarevocationpath" id="sslcarevocationpath">Directive</a></h2>
488 <table class="directive">
489 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Directory of PEM-encoded CA CRLs for
490 Client Auth</td></tr>
491 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLCARevocationPath <em>directory-path</em></code></td></tr>
492 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
493 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
494 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
497 This directive sets the directory where you keep the Certificate Revocation
498 Lists (CRL) of Certification Authorities (CAs) whose clients you deal with.
499 These are used to revoke the client certificate on Client Authentication.</p>
501 The files in this directory have to be PEM-encoded and are accessed through
502 hash filenames. So usually you have not only to place the CRL files there.
503 Additionally you have to create symbolic links named
504 <em>hash-value</em><code>.rN</code>. And you should always make sure this directory
505 contains the appropriate symbolic links.</p>
506 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLCARevocationPath /usr/local/apache2/conf/ssl.crl/</pre>
510 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
511 <div class="directive-section"><h2><a name="SSLCertificateChainFile" id="SSLCertificateChainFile">SSLCertificateChainFile</a> <a name="sslcertificatechainfile" id="sslcertificatechainfile">Directive</a></h2>
512 <table class="directive">
513 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>File of PEM-encoded Server CA Certificates</td></tr>
514 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLCertificateChainFile <em>file-path</em></code></td></tr>
515 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
516 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
517 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
519 <div class="note"><h3>SSLCertificateChainFile is deprecated</h3>
520 <p><code>SSLCertificateChainFile</code> became obsolete with version
521 2.5.0-dev as of 2013-12-28, when
522 <code class="directive"><a href="#sslcertificatefile">SSLCertificateFile</a></code>
523 was extended to also load intermediate CA certificates from the server
524 certificate file.</p>
528 This directive sets the optional <em>all-in-one</em> file where you can
529 assemble the certificates of Certification Authorities (CA) which form the
530 certificate chain of the server certificate. This starts with the issuing CA
531 certificate of the server certificate and can range up to the root CA
532 certificate. Such a file is simply the concatenation of the various
533 PEM-encoded CA Certificate files, usually in certificate chain order.</p>
535 This should be used alternatively and/or additionally to <code class="directive"><a href="#sslcacertificatepath">SSLCACertificatePath</a></code> for explicitly
536 constructing the server certificate chain which is sent to the browser
537 in addition to the server certificate. It is especially useful to
538 avoid conflicts with CA certificates when using client
539 authentication. Because although placing a CA certificate of the
540 server certificate chain into <code class="directive"><a href="#sslcacertificatepath">SSLCACertificatePath</a></code> has the same effect
541 for the certificate chain construction, it has the side-effect that
542 client certificates issued by this same CA certificate are also
543 accepted on client authentication.</p>
545 But be careful: Providing the certificate chain works only if you are using a
546 <em>single</em> RSA <em>or</em> DSA based server certificate. If you are
547 using a coupled RSA+DSA certificate pair, this will work only if actually both
548 certificates use the <em>same</em> certificate chain. Else the browsers will be
549 confused in this situation.</p>
550 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLCertificateChainFile /usr/local/apache2/conf/ssl.crt/ca.crt</pre>
554 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
555 <div class="directive-section"><h2><a name="SSLCertificateFile" id="SSLCertificateFile">SSLCertificateFile</a> <a name="sslcertificatefile" id="sslcertificatefile">Directive</a></h2>
556 <table class="directive">
557 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Server PEM-encoded X.509 certificate data file</td></tr>
558 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLCertificateFile <em>file-path</em></code></td></tr>
559 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
560 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
561 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
564 This directive points to a file with certificate data in PEM format.
565 At a minimum, the file must include an end-entity (leaf) certificate.
566 Beginning with version 2.5.0-dev as of 2013-12-28, it may also
567 include intermediate CA certificates, sorted from leaf to root,
568 and obsoletes <code class="directive"><a href="#sslcertificatechainfile">SSLCertificateChainFile</a></code>.
572 Additional optional elements are DH parameters and/or an EC curve name
573 for ephemeral keys, as generated by <code>openssl dhparam</code> and
574 <code>openssl ecparam</code>, respectively (supported in version 2.5.0-dev
575 as of 2013-09-29), and finally, the end-entity certificate's private key.
576 If the private key is encrypted, the pass phrase dialog is forced
580 This directive can be used multiple times (referencing different filenames)
581 to support multiple algorithms for server authentication - typically
582 RSA, DSA, and ECC. The number of supported algorithms depends on the
583 OpenSSL version being used for mod_ssl: with version 1.0.0 or later,
584 <code>openssl list-public-key-algorithms</code> will output a list
585 of supported algorithms.</p>
588 When running with OpenSSL 1.0.2 or later, this directive allows
589 to configure the intermediate CA chain on a per-certificate basis,
590 which removes a limitation of the (now obsolete)
591 <code class="directive"><a href="#sslcertificatechainfile">SSLCertificateChainFile</a></code> directive.
592 DH and ECDH parameters, however, are only read from the first
593 <code class="directive">SSLCertificateFile</code> directive, as they
594 are applied independently of the authentication algorithm type.</p>
597 <h3>DH parameter interoperability with primes > 1024 bit</h3>
599 Beginning with version 2.4.7, mod_ssl makes use of
600 standardized DH parameters with prime lengths of 2048, 3072 and 4096 bits
601 and with additional prime lengths of 6144 and 8192 bits beginning with
603 (from <a href="http://www.ietf.org/rfc/rfc3526.txt">RFC 3526</a>), and hands
604 them out to clients based on the length of the certificate's RSA/DSA key.
605 With Java-based clients in particular (Java 7 or earlier), this may lead
606 to handshake failures - see this
607 <a href="../ssl/ssl_faq.html#javadh">FAQ answer</a> for working around
612 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLCertificateFile /usr/local/apache2/conf/ssl.crt/server.crt</pre>
616 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
617 <div class="directive-section"><h2><a name="SSLCertificateKeyFile" id="SSLCertificateKeyFile">SSLCertificateKeyFile</a> <a name="sslcertificatekeyfile" id="sslcertificatekeyfile">Directive</a></h2>
618 <table class="directive">
619 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Server PEM-encoded private key file</td></tr>
620 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLCertificateKeyFile <em>file-path</em></code></td></tr>
621 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
622 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
623 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
626 This directive points to the PEM-encoded private key file for the
627 server (the private key may also be combined with the certificate in the
628 <code class="directive"><a href="#sslcertificatefile">SSLCertificateFile</a></code>, but this practice
629 is discouraged). If the contained private key is encrypted, the pass phrase
630 dialog is forced at startup time.</p>
633 The directive can be used multiple times (referencing different filenames)
634 to support multiple algorithms for server authentication. For each
635 <code class="directive"><a href="#sslcertificatekeyfile">SSLCertificateKeyFile</a></code>
636 directive, there must be a matching <code class="directive">SSLCertificateFile</code>
639 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLCertificateKeyFile /usr/local/apache2/conf/ssl.key/server.key</pre>
643 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
644 <div class="directive-section"><h2><a name="SSLCipherSuite" id="SSLCipherSuite">SSLCipherSuite</a> <a name="sslciphersuite" id="sslciphersuite">Directive</a></h2>
645 <table class="directive">
646 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Cipher Suite available for negotiation in SSL
648 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLCipherSuite <em>cipher-spec</em></code></td></tr>
649 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLCipherSuite DEFAULT (depends on OpenSSL version)</code></td></tr>
650 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
651 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>AuthConfig</td></tr>
652 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
653 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
656 This complex directive uses a colon-separated <em>cipher-spec</em> string
657 consisting of OpenSSL cipher specifications to configure the Cipher Suite the
658 client is permitted to negotiate in the SSL handshake phase. Notice that this
659 directive can be used both in per-server and per-directory context. In
660 per-server context it applies to the standard SSL handshake when a connection
661 is established. In per-directory context it forces a SSL renegotiation with the
662 reconfigured Cipher Suite after the HTTP request was read but before the HTTP
663 response is sent.</p>
665 An SSL cipher specification in <em>cipher-spec</em> is composed of 4 major
666 attributes plus a few extra minor ones:</p>
668 <li><em>Key Exchange Algorithm</em>:<br />
669 RSA, Diffie-Hellman, Elliptic Curve Diffie-Hellman, Secure Remote Password
671 <li><em>Authentication Algorithm</em>:<br />
672 RSA, Diffie-Hellman, DSS, ECDSA, or none.
674 <li><em>Cipher/Encryption Algorithm</em>:<br />
675 AES, DES, Triple-DES, RC4, RC2, IDEA, etc.
677 <li><em>MAC Digest Algorithm</em>:<br />
678 MD5, SHA or SHA1, SHA256, SHA384.
681 <p>An SSL cipher can also be an export cipher. SSLv2 ciphers are no longer
682 supported. To specify which ciphers to use, one can either specify all the
683 Ciphers, one at a time, or use aliases to specify the preference and order
684 for the ciphers (see <a href="#table1">Table
685 1</a>). The actually available ciphers and aliases depends on the used
686 openssl version. Newer openssl versions may include additional ciphers.</p>
688 <table class="bordered">
690 <tr><th><a name="table1">Tag</a></th> <th>Description</th></tr>
691 <tr><td colspan="2"><em>Key Exchange Algorithm:</em></td></tr>
692 <tr><td><code>kRSA</code></td> <td>RSA key exchange</td></tr>
693 <tr><td><code>kDHr</code></td> <td>Diffie-Hellman key exchange with RSA key</td></tr>
694 <tr><td><code>kDHd</code></td> <td>Diffie-Hellman key exchange with DSA key</td></tr>
695 <tr><td><code>kEDH</code></td> <td>Ephemeral (temp.key) Diffie-Hellman key exchange (no cert)</td> </tr>
696 <tr><td><code>kSRP</code></td> <td>Secure Remote Password (SRP) key exchange</td></tr>
697 <tr><td colspan="2"><em>Authentication Algorithm:</em></td></tr>
698 <tr><td><code>aNULL</code></td> <td>No authentication</td></tr>
699 <tr><td><code>aRSA</code></td> <td>RSA authentication</td></tr>
700 <tr><td><code>aDSS</code></td> <td>DSS authentication</td> </tr>
701 <tr><td><code>aDH</code></td> <td>Diffie-Hellman authentication</td></tr>
702 <tr><td colspan="2"><em>Cipher Encoding Algorithm:</em></td></tr>
703 <tr><td><code>eNULL</code></td> <td>No encryption</td> </tr>
704 <tr><td><code>NULL</code></td> <td>alias for eNULL</td> </tr>
705 <tr><td><code>AES</code></td> <td>AES encryption</td> </tr>
706 <tr><td><code>DES</code></td> <td>DES encryption</td> </tr>
707 <tr><td><code>3DES</code></td> <td>Triple-DES encryption</td> </tr>
708 <tr><td><code>RC4</code></td> <td>RC4 encryption</td> </tr>
709 <tr><td><code>RC2</code></td> <td>RC2 encryption</td> </tr>
710 <tr><td><code>IDEA</code></td> <td>IDEA encryption</td> </tr>
711 <tr><td colspan="2"><em>MAC Digest Algorithm</em>:</td></tr>
712 <tr><td><code>MD5</code></td> <td>MD5 hash function</td></tr>
713 <tr><td><code>SHA1</code></td> <td>SHA1 hash function</td></tr>
714 <tr><td><code>SHA</code></td> <td>alias for SHA1</td> </tr>
715 <tr><td><code>SHA256</code></td> <td>SHA256 hash function</td> </tr>
716 <tr><td><code>SHA384</code></td> <td>SHA384 hash function</td> </tr>
717 <tr><td colspan="2"><em>Aliases:</em></td></tr>
718 <tr><td><code>SSLv3</code></td> <td>all SSL version 3.0 ciphers</td> </tr>
719 <tr><td><code>TLSv1</code></td> <td>all TLS version 1.0 ciphers</td> </tr>
720 <tr><td><code>EXP</code></td> <td>all export ciphers</td> </tr>
721 <tr><td><code>EXPORT40</code></td> <td>all 40-bit export ciphers only</td> </tr>
722 <tr><td><code>EXPORT56</code></td> <td>all 56-bit export ciphers only</td> </tr>
723 <tr><td><code>LOW</code></td> <td>all low strength ciphers (no export, single DES)</td></tr>
724 <tr><td><code>MEDIUM</code></td> <td>all ciphers with 128 bit encryption</td> </tr>
725 <tr><td><code>HIGH</code></td> <td>all ciphers using Triple-DES</td> </tr>
726 <tr><td><code>RSA</code></td> <td>all ciphers using RSA key exchange</td> </tr>
727 <tr><td><code>DH</code></td> <td>all ciphers using Diffie-Hellman key exchange</td> </tr>
728 <tr><td><code>EDH</code></td> <td>all ciphers using Ephemeral Diffie-Hellman key exchange</td> </tr>
729 <tr><td><code>ECDH</code></td> <td>Elliptic Curve Diffie-Hellman key exchange</td> </tr>
730 <tr><td><code>ADH</code></td> <td>all ciphers using Anonymous Diffie-Hellman key exchange</td> </tr>
731 <tr><td><code>AECDH</code></td> <td>all ciphers using Anonymous Elliptic Curve Diffie-Hellman key exchange</td> </tr>
732 <tr><td><code>SRP</code></td> <td>all ciphers using Secure Remote Password (SRP) key exchange</td> </tr>
733 <tr><td><code>DSS</code></td> <td>all ciphers using DSS authentication</td> </tr>
734 <tr><td><code>ECDSA</code></td> <td>all ciphers using ECDSA authentication</td> </tr>
735 <tr><td><code>aNULL</code></td> <td>all ciphers using no authentication</td> </tr>
738 Now where this becomes interesting is that these can be put together
739 to specify the order and ciphers you wish to use. To speed this up
740 there are also aliases (<code>SSLv3, TLSv1, EXP, LOW, MEDIUM,
741 HIGH</code>) for certain groups of ciphers. These tags can be joined
742 together with prefixes to form the <em>cipher-spec</em>. Available
745 <li>none: add cipher to list</li>
746 <li><code>+</code>: move matching ciphers to the current location in list</li>
747 <li><code>-</code>: remove cipher from list (can be added later again)</li>
748 <li><code>!</code>: kill cipher from list completely (can <strong>not</strong> be added later again)</li>
752 <h3><code>aNULL</code>, <code>eNULL</code> and <code>EXP</code>
753 ciphers are always disabled</h3>
754 <p>Beginning with version 2.5.0-dev as of 2013-09-25, null and export-grade
755 ciphers are always disabled, as mod_ssl unconditionally prepends any supplied
756 cipher suite string with <code>!aNULL:!eNULL:!EXP:</code> at initialization.</p>
759 <p>A simpler way to look at all of this is to use the ``<code>openssl ciphers
760 -v</code>'' command which provides a nice way to successively create the
761 correct <em>cipher-spec</em> string. The default <em>cipher-spec</em> string
762 depends on the version of the OpenSSL libraries used. Let's suppose it is
763 ``<code>RC4-SHA:AES128-SHA:HIGH:MEDIUM:!aNULL:!MD5</code>'' which
764 means the following: Put <code>RC4-SHA</code> and <code>AES128-SHA</code> at
765 the beginning. We do this, because these ciphers offer a good compromise
766 between speed and security. Next, include high and medium security ciphers.
767 Finally, remove all ciphers which do not authenticate, i.e. for SSL the
768 Anonymous Diffie-Hellman ciphers, as well as all ciphers which use
769 <code>MD5</code> as hash algorithm, because it has been proven insufficient.</p>
770 <div class="example"><pre>$ openssl ciphers -v 'RC4-SHA:AES128-SHA:HIGH:MEDIUM:!aNULL:!MD5'
771 RC4-SHA SSLv3 Kx=RSA Au=RSA Enc=RC4(128) Mac=SHA1
772 AES128-SHA SSLv3 Kx=RSA Au=RSA Enc=AES(128) Mac=SHA1
773 DHE-RSA-AES256-SHA SSLv3 Kx=DH Au=RSA Enc=AES(256) Mac=SHA1
775 SEED-SHA SSLv3 Kx=RSA Au=RSA Enc=SEED(128) Mac=SHA1
776 PSK-RC4-SHA SSLv3 Kx=PSK Au=PSK Enc=RC4(128) Mac=SHA1
777 KRB5-RC4-SHA SSLv3 Kx=KRB5 Au=KRB5 Enc=RC4(128) Mac=SHA1</pre></div>
778 <p>The complete list of particular RSA & DH ciphers for SSL is given in <a href="#table2">Table 2</a>.</p>
779 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLCipherSuite RSA:!EXP:!NULL:+HIGH:+MEDIUM:-LOW</pre>
781 <table class="bordered">
783 <tr><th><a name="table2">Cipher-Tag</a></th> <th>Protocol</th> <th>Key Ex.</th> <th>Auth.</th> <th>Enc.</th> <th>MAC</th> <th>Type</th> </tr>
784 <tr><td colspan="7"><em>RSA Ciphers:</em></td></tr>
785 <tr><td><code>DES-CBC3-SHA</code></td> <td>SSLv3</td> <td>RSA</td> <td>RSA</td> <td>3DES(168)</td> <td>SHA1</td> <td /> </tr>
786 <tr><td><code>IDEA-CBC-SHA</code></td> <td>SSLv3</td> <td>RSA</td> <td>RSA</td> <td>IDEA(128)</td> <td>SHA1</td> <td /> </tr>
787 <tr><td><code>RC4-SHA</code></td> <td>SSLv3</td> <td>RSA</td> <td>RSA</td> <td>RC4(128)</td> <td>SHA1</td> <td /> </tr>
788 <tr><td><code>RC4-MD5</code></td> <td>SSLv3</td> <td>RSA</td> <td>RSA</td> <td>RC4(128)</td> <td>MD5</td> <td /> </tr>
789 <tr><td><code>DES-CBC-SHA</code></td> <td>SSLv3</td> <td>RSA</td> <td>RSA</td> <td>DES(56)</td> <td>SHA1</td> <td /> </tr>
790 <tr><td><code>EXP-DES-CBC-SHA</code></td> <td>SSLv3</td> <td>RSA(512)</td> <td>RSA</td> <td>DES(40)</td> <td>SHA1</td> <td> export</td> </tr>
791 <tr><td><code>EXP-RC2-CBC-MD5</code></td> <td>SSLv3</td> <td>RSA(512)</td> <td>RSA</td> <td>RC2(40)</td> <td>MD5</td> <td> export</td> </tr>
792 <tr><td><code>EXP-RC4-MD5</code></td> <td>SSLv3</td> <td>RSA(512)</td> <td>RSA</td> <td>RC4(40)</td> <td>MD5</td> <td> export</td> </tr>
793 <tr><td><code>NULL-SHA</code></td> <td>SSLv3</td> <td>RSA</td> <td>RSA</td> <td>None</td> <td>SHA1</td> <td /> </tr>
794 <tr><td><code>NULL-MD5</code></td> <td>SSLv3</td> <td>RSA</td> <td>RSA</td> <td>None</td> <td>MD5</td> <td /> </tr>
795 <tr><td colspan="7"><em>Diffie-Hellman Ciphers:</em></td></tr>
796 <tr><td><code>ADH-DES-CBC3-SHA</code></td> <td>SSLv3</td> <td>DH</td> <td>None</td> <td>3DES(168)</td> <td>SHA1</td> <td /> </tr>
797 <tr><td><code>ADH-DES-CBC-SHA</code></td> <td>SSLv3</td> <td>DH</td> <td>None</td> <td>DES(56)</td> <td>SHA1</td> <td /> </tr>
798 <tr><td><code>ADH-RC4-MD5</code></td> <td>SSLv3</td> <td>DH</td> <td>None</td> <td>RC4(128)</td> <td>MD5</td> <td /> </tr>
799 <tr><td><code>EDH-RSA-DES-CBC3-SHA</code></td> <td>SSLv3</td> <td>DH</td> <td>RSA</td> <td>3DES(168)</td> <td>SHA1</td> <td /> </tr>
800 <tr><td><code>EDH-DSS-DES-CBC3-SHA</code></td> <td>SSLv3</td> <td>DH</td> <td>DSS</td> <td>3DES(168)</td> <td>SHA1</td> <td /> </tr>
801 <tr><td><code>EDH-RSA-DES-CBC-SHA</code></td> <td>SSLv3</td> <td>DH</td> <td>RSA</td> <td>DES(56)</td> <td>SHA1</td> <td /> </tr>
802 <tr><td><code>EDH-DSS-DES-CBC-SHA</code></td> <td>SSLv3</td> <td>DH</td> <td>DSS</td> <td>DES(56)</td> <td>SHA1</td> <td /> </tr>
803 <tr><td><code>EXP-EDH-RSA-DES-CBC-SHA</code></td> <td>SSLv3</td> <td>DH(512)</td> <td>RSA</td> <td>DES(40)</td> <td>SHA1</td> <td> export</td> </tr>
804 <tr><td><code>EXP-EDH-DSS-DES-CBC-SHA</code></td> <td>SSLv3</td> <td>DH(512)</td> <td>DSS</td> <td>DES(40)</td> <td>SHA1</td> <td> export</td> </tr>
805 <tr><td><code>EXP-ADH-DES-CBC-SHA</code></td> <td>SSLv3</td> <td>DH(512)</td> <td>None</td> <td>DES(40)</td> <td>SHA1</td> <td> export</td> </tr>
806 <tr><td><code>EXP-ADH-RC4-MD5</code></td> <td>SSLv3</td> <td>DH(512)</td> <td>None</td> <td>RC4(40)</td> <td>MD5</td> <td> export</td> </tr>
810 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
811 <div class="directive-section"><h2><a name="SSLCompression" id="SSLCompression">SSLCompression</a> <a name="sslcompression" id="sslcompression">Directive</a></h2>
812 <table class="directive">
813 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable compression on the SSL level</td></tr>
814 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLCompression on|off</code></td></tr>
815 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLCompression off</code></td></tr>
816 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
817 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
818 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
819 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in httpd 2.4.3 and later, if using OpenSSL 0.9.8 or later;
820 virtual host scope available if using OpenSSL 1.0.0 or later.
821 The default used to be <code>on</code> in version 2.4.3.</td></tr>
823 <p>This directive allows to enable compression on the SSL level.</p>
824 <div class="warning">
825 <p>Enabling compression causes security issues in most setups (the so called
830 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
831 <div class="directive-section"><h2><a name="SSLCryptoDevice" id="SSLCryptoDevice">SSLCryptoDevice</a> <a name="sslcryptodevice" id="sslcryptodevice">Directive</a></h2>
832 <table class="directive">
833 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable use of a cryptographic hardware accelerator</td></tr>
834 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLCryptoDevice <em>engine</em></code></td></tr>
835 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLCryptoDevice builtin</code></td></tr>
836 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
837 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
838 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
841 This directive enables use of a cryptographic hardware accelerator
842 board to offload some of the SSL processing overhead. This directive
843 can only be used if the SSL toolkit is built with "engine" support;
844 OpenSSL 0.9.7 and later releases have "engine" support by default, the
845 separate "-engine" releases of OpenSSL 0.9.6 must be used.</p>
847 <p>To discover which engine names are supported, run the command
848 "<code>openssl engine</code>".</p>
850 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config"># For a Broadcom accelerator:
851 SSLCryptoDevice ubsec</pre>
855 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
856 <div class="directive-section"><h2><a name="SSLEngine" id="SSLEngine">SSLEngine</a> <a name="sslengine" id="sslengine">Directive</a></h2>
857 <table class="directive">
858 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>SSL Engine Operation Switch</td></tr>
859 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLEngine on|off|optional</code></td></tr>
860 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLEngine off</code></td></tr>
861 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
862 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
863 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
866 This directive toggles the usage of the SSL/TLS Protocol Engine. This
867 is should be used inside a <code class="directive"><a href="../mod/core.html#virtualhost"><VirtualHost></a></code> section to enable SSL/TLS for a
868 that virtual host. By default the SSL/TLS Protocol Engine is
869 disabled for both the main server and all configured virtual hosts.</p>
870 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config"><VirtualHost _default_:443>
873 </VirtualHost></pre>
875 <p>In Apache 2.1 and later, <code class="directive">SSLEngine</code> can be set to
876 <code>optional</code>. This enables support for
877 <a href="http://www.ietf.org/rfc/rfc2817.txt">RFC 2817</a>, Upgrading to TLS
878 Within HTTP/1.1. At this time no web browsers support RFC 2817.</p>
881 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
882 <div class="directive-section"><h2><a name="SSLFIPS" id="SSLFIPS">SSLFIPS</a> <a name="sslfips" id="sslfips">Directive</a></h2>
883 <table class="directive">
884 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>SSL FIPS mode Switch</td></tr>
885 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLFIPS on|off</code></td></tr>
886 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLFIPS off</code></td></tr>
887 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
888 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
889 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
892 This directive toggles the usage of the SSL library FIPS_mode flag.
893 It must be set in the global server context and cannot be configured
894 with conflicting settings (SSLFIPS on followed by SSLFIPS off or
895 similar). The mode applies to all SSL library operations.
898 If httpd was compiled against an SSL library which did not support
899 the FIPS_mode flag, <code>SSLFIPS on</code> will fail. Refer to the
900 FIPS 140-2 Security Policy document of the SSL provider library for
901 specific requirements to use mod_ssl in a FIPS 140-2 approved mode
902 of operation; note that mod_ssl itself is not validated, but may be
903 described as using FIPS 140-2 validated cryptographic module, when
904 all components are assembled and operated under the guidelines imposed
905 by the applicable Security Policy.
909 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
910 <div class="directive-section"><h2><a name="SSLHonorCipherOrder" id="SSLHonorCipherOrder">SSLHonorCipherOrder</a> <a name="sslhonorcipherorder" id="sslhonorcipherorder">Directive</a></h2>
911 <table class="directive">
912 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Option to prefer the server's cipher preference order</td></tr>
913 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLHonorCipherOrder on|off</code></td></tr>
914 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLHonorCipherOrder off</code></td></tr>
915 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
916 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
917 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
919 <p>When choosing a cipher during an SSLv3 or TLSv1 handshake, normally
920 the client's preference is used. If this directive is enabled, the
921 server's preference will be used instead.</p>
922 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLHonorCipherOrder on</pre>
926 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
927 <div class="directive-section"><h2><a name="SSLInsecureRenegotiation" id="SSLInsecureRenegotiation">SSLInsecureRenegotiation</a> <a name="sslinsecurerenegotiation" id="sslinsecurerenegotiation">Directive</a></h2>
928 <table class="directive">
929 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Option to enable support for insecure renegotiation</td></tr>
930 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLInsecureRenegotiation on|off</code></td></tr>
931 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLInsecureRenegotiation off</code></td></tr>
932 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
933 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
934 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
935 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available if using OpenSSL 0.9.8m or later</td></tr>
937 <p>As originally specified, all versions of the SSL and TLS protocols
938 (up to and including TLS/1.2) were vulnerable to a Man-in-the-Middle
940 (<a href="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2009-3555">CVE-2009-3555</a>)
941 during a renegotiation. This vulnerability allowed an attacker to
942 "prefix" a chosen plaintext to the HTTP request as seen by the web
943 server. A protocol extension was developed which fixed this
944 vulnerability if supported by both client and server.</p>
946 <p>If <code class="module"><a href="../mod/mod_ssl.html">mod_ssl</a></code> is linked against OpenSSL version 0.9.8m
947 or later, by default renegotiation is only supported with
948 clients supporting the new protocol extension. If this directive is
949 enabled, renegotiation will be allowed with old (unpatched) clients,
950 albeit insecurely.</p>
952 <div class="warning"><h3>Security warning</h3>
953 <p>If this directive is enabled, SSL connections will be vulnerable to
954 the Man-in-the-Middle prefix attack as described
955 in <a href="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2009-3555">CVE-2009-3555</a>.</p>
958 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLInsecureRenegotiation on</pre>
961 <p>The <code>SSL_SECURE_RENEG</code> environment variable can be used
962 from an SSI or CGI script to determine whether secure renegotiation is
963 supported for a given SSL connection.</p>
967 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
968 <div class="directive-section"><h2><a name="SSLOCSPDefaultResponder" id="SSLOCSPDefaultResponder">SSLOCSPDefaultResponder</a> <a name="sslocspdefaultresponder" id="sslocspdefaultresponder">Directive</a></h2>
969 <table class="directive">
970 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Set the default responder URI for OCSP validation</td></tr>
971 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLOCSDefaultResponder <em>uri</em></code></td></tr>
972 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
973 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
974 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
976 <p>This option sets the default OCSP responder to use. If <code class="directive"><a href="#sslocspoverrideresponder">SSLOCSPOverrideResponder</a></code> is not enabled,
977 the URI given will be used only if no responder URI is specified in
978 the certificate being verified.</p>
981 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
982 <div class="directive-section"><h2><a name="SSLOCSPEnable" id="SSLOCSPEnable">SSLOCSPEnable</a> <a name="sslocspenable" id="sslocspenable">Directive</a></h2>
983 <table class="directive">
984 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable OCSP validation of the client certificate chain</td></tr>
985 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLOCSPEnable on|off</code></td></tr>
986 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLOCSPEnable off</code></td></tr>
987 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
988 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
989 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
991 <p>This option enables OCSP validation of the client certificate
992 chain. If this option is enabled, certificates in the client's
993 certificate chain will be validated against an OCSP responder after
994 normal verification (including CRL checks) have taken place.</p>
996 <p>The OCSP responder used is either extracted from the certificate
997 itself, or derived by configuration; see the
998 <code class="directive"><a href="#sslocspdefaultresponder">SSLOCSPDefaultResponder</a></code> and
999 <code class="directive"><a href="#sslocspoverrideresponder">SSLOCSPOverrideResponder</a></code>
1002 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLVerifyClient on
1004 SSLOCSPDefaultResponder http://responder.example.com:8888/responder
1005 SSLOCSPOverrideResponder on</pre>
1009 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1010 <div class="directive-section"><h2><a name="SSLOCSPOverrideResponder" id="SSLOCSPOverrideResponder">SSLOCSPOverrideResponder</a> <a name="sslocspoverrideresponder" id="sslocspoverrideresponder">Directive</a></h2>
1011 <table class="directive">
1012 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Force use of the default responder URI for OCSP validation</td></tr>
1013 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLOCSPOverrideResponder on|off</code></td></tr>
1014 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLOCSPOverrideResponder off</code></td></tr>
1015 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
1016 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1017 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1019 <p>This option forces the configured default OCSP responder to be used
1020 during OCSP certificate validation, regardless of whether the
1021 certificate being validated references an OCSP responder.</p>
1024 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1025 <div class="directive-section"><h2><a name="SSLOCSPResponderTimeout" id="SSLOCSPResponderTimeout">SSLOCSPResponderTimeout</a> <a name="sslocsprespondertimeout" id="sslocsprespondertimeout">Directive</a></h2>
1026 <table class="directive">
1027 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Timeout for OCSP queries</td></tr>
1028 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLOCSPResponderTimeout <em>seconds</em></code></td></tr>
1029 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLOCSPResponderTimeout 10</code></td></tr>
1030 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
1031 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1032 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1034 <p>This option sets the timeout for queries to OCSP responders, when
1035 <code class="directive"><a href="#sslocspenable">SSLOCSPEnable</a></code> is turned on.</p>
1038 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1039 <div class="directive-section"><h2><a name="SSLOCSPResponseMaxAge" id="SSLOCSPResponseMaxAge">SSLOCSPResponseMaxAge</a> <a name="sslocspresponsemaxage" id="sslocspresponsemaxage">Directive</a></h2>
1040 <table class="directive">
1041 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum allowable age for OCSP responses</td></tr>
1042 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLOCSPResponseMaxAge <em>seconds</em></code></td></tr>
1043 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLOCSPResponseMaxAge -1</code></td></tr>
1044 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
1045 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1046 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1048 <p>This option sets the maximum allowable age ("freshness") for OCSP responses.
1049 The default value (<code>-1</code>) does not enforce a maximum age,
1050 which means that OCSP responses are considered valid as long as their
1051 <code>nextUpdate</code> field is in the future.</p>
1054 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1055 <div class="directive-section"><h2><a name="SSLOCSPResponseTimeSkew" id="SSLOCSPResponseTimeSkew">SSLOCSPResponseTimeSkew</a> <a name="sslocspresponsetimeskew" id="sslocspresponsetimeskew">Directive</a></h2>
1056 <table class="directive">
1057 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum allowable time skew for OCSP response validation</td></tr>
1058 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLOCSPResponseTimeSkew <em>seconds</em></code></td></tr>
1059 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLOCSPResponseTimeSkew 300</code></td></tr>
1060 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
1061 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1062 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1064 <p>This option sets the maximum allowable time skew for OCSP responses
1065 (when checking their <code>thisUpdate</code> and <code>nextUpdate</code> fields).</p>
1068 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1069 <div class="directive-section"><h2><a name="SSLOCSPUseRequestNonce" id="SSLOCSPUseRequestNonce">SSLOCSPUseRequestNonce</a> <a name="sslocspuserequestnonce" id="sslocspuserequestnonce">Directive</a></h2>
1070 <table class="directive">
1071 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Use a nonce within OCSP queries</td></tr>
1072 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLOCSPUseRequestNonce on|off</code></td></tr>
1073 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLOCSPUseRequestNonce on</code></td></tr>
1074 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
1075 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1076 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1077 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in httpd 2.5-dev and later</td></tr>
1079 <p>This option determines whether queries to OCSP responders should contain
1080 a nonce or not. By default, a query nonce is always used and checked against
1081 the response's one. When the responder does not use nonces (e.g. Microsoft OCSP
1082 Responder), this option should be turned <code>off</code>.</p>
1085 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1086 <div class="directive-section"><h2><a name="SSLOpenSSLConfCmd" id="SSLOpenSSLConfCmd">SSLOpenSSLConfCmd</a> <a name="sslopensslconfcmd" id="sslopensslconfcmd">Directive</a></h2>
1087 <table class="directive">
1088 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Configure OpenSSL parameters through its <em>SSL_CONF</em> API</td></tr>
1089 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLOpenSSLConfCmd <em>command-name</em> <em>command-value</em></code></td></tr>
1090 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
1091 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1092 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1093 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in httpd 2.4.8 and later, if using OpenSSL 1.0.2 or later</td></tr>
1095 <p>This directive exposes OpenSSL's <em>SSL_CONF</em> API to mod_ssl,
1096 allowing a flexible configuration of OpenSSL parameters without the need
1097 of implementing additional <code class="module"><a href="../mod/mod_ssl.html">mod_ssl</a></code> directives when new
1098 features are added to OpenSSL.</p>
1100 <p>The set of available <code class="directive">SSLOpenSSLConfCmd</code> commands
1101 depends on the OpenSSL version being used for <code class="module"><a href="../mod/mod_ssl.html">mod_ssl</a></code>
1102 (at least version 1.0.2 is required). For a list of supported command
1103 names, see the section <em>Supported configuration file commands</em> in the
1104 <a href="http://www.openssl.org/docs/ssl/SSL_CONF_cmd.html#supported_configuration_file_commands">SSL_CONF_cmd(3)</a> manual page for OpenSSL.</p>
1106 <p>Some of the <code class="directive">SSLOpenSSLConfCmd</code> commands can be used
1107 as an alternative to existing directives (such as
1108 <code class="directive"><a href="#sslciphersuite">SSLCipherSuite</a></code> or
1109 <code class="directive"><a href="#sslprotocol">SSLProtocol</a></code>),
1110 though it should be noted that the syntax / allowable values for the parameters
1111 may sometimes differ.</p>
1113 <div class="example"><h3>Examples</h3><pre class="prettyprint lang-config">SSLOpenSSLConfCmd Options -SessionTicket,ServerPreference
1114 SSLOpenSSLConfCmd ECDHParameters brainpoolP256r1
1115 SSLOpenSSLConfCmd ServerInfoFile /usr/local/apache2/conf/server-info.pem
1116 SSLOpenSSLConfCmd Protocol "-ALL, TLSv1.2"
1117 SSLOpenSSLConfCmd SignatureAlgorithms RSA+SHA384:ECDSA+SHA256</pre>
1121 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1122 <div class="directive-section"><h2><a name="SSLOptions" id="SSLOptions">SSLOptions</a> <a name="ssloptions" id="ssloptions">Directive</a></h2>
1123 <table class="directive">
1124 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Configure various SSL engine run-time options</td></tr>
1125 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLOptions [+|-]<em>option</em> ...</code></td></tr>
1126 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1127 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>Options</td></tr>
1128 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1129 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1132 This directive can be used to control various run-time options on a
1133 per-directory basis. Normally, if multiple <code>SSLOptions</code>
1134 could apply to a directory, then the most specific one is taken
1135 completely; the options are not merged. However if <em>all</em> the
1136 options on the <code>SSLOptions</code> directive are preceded by a
1137 plus (<code>+</code>) or minus (<code>-</code>) symbol, the options
1138 are merged. Any options preceded by a <code>+</code> are added to the
1139 options currently in force, and any options preceded by a
1140 <code>-</code> are removed from the options currently in force.</p>
1142 The available <em>option</em>s are:</p>
1144 <li><code>StdEnvVars</code>
1146 When this option is enabled, the standard set of SSL related CGI/SSI
1147 environment variables are created. This per default is disabled for
1148 performance reasons, because the information extraction step is a
1149 rather expensive operation. So one usually enables this option for
1150 CGI and SSI requests only.</p>
1152 <li><code>ExportCertData</code>
1154 When this option is enabled, additional CGI/SSI environment variables are
1155 created: <code>SSL_SERVER_CERT</code>, <code>SSL_CLIENT_CERT</code> and
1156 <code>SSL_CLIENT_CERT_CHAIN_</code><em>n</em> (with <em>n</em> = 0,1,2,..).
1157 These contain the PEM-encoded X.509 Certificates of server and client for
1158 the current HTTPS connection and can be used by CGI scripts for deeper
1159 Certificate checking. Additionally all other certificates of the client
1160 certificate chain are provided, too. This bloats up the environment a
1161 little bit which is why you have to use this option to enable it on
1164 <li><code>FakeBasicAuth</code>
1166 When this option is enabled, the Subject Distinguished Name (DN) of the
1167 Client X509 Certificate is translated into a HTTP Basic Authorization
1168 username. This means that the standard Apache authentication methods can
1169 be used for access control. The user name is just the Subject of the
1170 Client's X509 Certificate (can be determined by running OpenSSL's
1171 <code>openssl x509</code> command: <code>openssl x509 -noout -subject -in
1172 </code><em>certificate</em><code>.crt</code>). The optional <code class="directive"><a href="#sslusername">SSLUserName</a></code> directive can be used to
1173 specify which part of the certificate Subject is embedded in the username.
1174 Note that no password is obtained from the user. Every entry in the user
1175 file needs this password: ``<code>xxj31ZMTZzkVA</code>'', which is the
1176 DES-encrypted version of the word `<code>password</code>''. Those who
1177 live under MD5-based encryption (for instance under FreeBSD or BSD/OS,
1178 etc.) should use the following MD5 hash of the same word:
1179 ``<code>$1$OXLyS...$Owx8s2/m9/gfkcRVXzgoE/</code>''.</p>
1181 <p>Note that the <code class="directive"><a href="../mod/mod_auth_basic.html#authbasicfake">AuthBasicFake</a></code>
1182 directive within <code class="module"><a href="../mod/mod_auth_basic.html">mod_auth_basic</a></code> can be used as a more
1183 general mechanism for faking basic authentication, giving control over the
1184 structure of both the username and password.</p>
1186 <li><code>StrictRequire</code>
1188 This <em>forces</em> forbidden access when <code>SSLRequireSSL</code> or
1189 <code>SSLRequire</code> successfully decided that access should be
1190 forbidden. Usually the default is that in the case where a ``<code>Satisfy
1191 any</code>'' directive is used, and other access restrictions are passed,
1192 denial of access due to <code>SSLRequireSSL</code> or
1193 <code>SSLRequire</code> is overridden (because that's how the Apache
1194 <code>Satisfy</code> mechanism should work.) But for strict access restriction
1195 you can use <code>SSLRequireSSL</code> and/or <code>SSLRequire</code> in
1196 combination with an ``<code>SSLOptions +StrictRequire</code>''. Then an
1197 additional ``<code>Satisfy Any</code>'' has no chance once mod_ssl has
1198 decided to deny access.</p>
1200 <li><code>OptRenegotiate</code>
1202 This enables optimized SSL connection renegotiation handling when SSL
1203 directives are used in per-directory context. By default a strict
1204 scheme is enabled where <em>every</em> per-directory reconfiguration of
1205 SSL parameters causes a <em>full</em> SSL renegotiation handshake. When this
1206 option is used mod_ssl tries to avoid unnecessary handshakes by doing more
1207 granular (but still safe) parameter checks. Nevertheless these granular
1208 checks sometimes may not be what the user expects, so enable this on a
1209 per-directory basis only, please.</p>
1211 <li><code>LegacyDNStringFormat</code>
1213 This option influences how values of the
1214 <code>SSL_{CLIENT,SERVER}_{I,S}_DN</code> variables are formatted. Since
1215 version 2.3.11, Apache HTTPD uses a RFC 2253 compatible format by
1216 default. This uses commas as delimiters between the attributes, allows the
1217 use of non-ASCII characters (which are converted to UTF8), escapes
1218 various special characters with backslashes, and sorts the attributes
1219 with the "C" attribute last.</p>
1221 <p>If <code>LegacyDNStringFormat</code> is set, the old format will be
1222 used which sorts the "C" attribute first, uses slashes as separators, and
1223 does not handle non-ASCII and special characters in any consistent way.
1227 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLOptions +FakeBasicAuth -StrictRequire
1228 <Files ~ "\.(cgi|shtml)$">
1229 SSLOptions +StdEnvVars -ExportCertData
1234 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1235 <div class="directive-section"><h2><a name="SSLPassPhraseDialog" id="SSLPassPhraseDialog">SSLPassPhraseDialog</a> <a name="sslpassphrasedialog" id="sslpassphrasedialog">Directive</a></h2>
1236 <table class="directive">
1237 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Type of pass phrase dialog for encrypted private
1239 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLPassPhraseDialog <em>type</em></code></td></tr>
1240 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLPassPhraseDialog builtin</code></td></tr>
1241 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
1242 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1243 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1246 When Apache starts up it has to read the various Certificate (see
1247 <code class="directive"><a href="#sslcertificatefile">SSLCertificateFile</a></code>) and
1248 Private Key (see <code class="directive"><a href="#sslcertificatekeyfile">SSLCertificateKeyFile</a></code>) files of the
1249 SSL-enabled virtual servers. Because for security reasons the Private
1250 Key files are usually encrypted, mod_ssl needs to query the
1251 administrator for a Pass Phrase in order to decrypt those files. This
1252 query can be done in two ways which can be configured by
1255 <li><code>builtin</code>
1257 This is the default where an interactive terminal dialog occurs at startup
1258 time just before Apache detaches from the terminal. Here the administrator
1259 has to manually enter the Pass Phrase for each encrypted Private Key file.
1260 Because a lot of SSL-enabled virtual hosts can be configured, the
1261 following reuse-scheme is used to minimize the dialog: When a Private Key
1262 file is encrypted, all known Pass Phrases (at the beginning there are
1263 none, of course) are tried. If one of those known Pass Phrases succeeds no
1264 dialog pops up for this particular Private Key file. If none succeeded,
1265 another Pass Phrase is queried on the terminal and remembered for the next
1266 round (where it perhaps can be reused).</p>
1268 This scheme allows mod_ssl to be maximally flexible (because for N encrypted
1269 Private Key files you <em>can</em> use N different Pass Phrases - but then
1270 you have to enter all of them, of course) while minimizing the terminal
1271 dialog (i.e. when you use a single Pass Phrase for all N Private Key files
1272 this Pass Phrase is queried only once).</p></li>
1274 <li><code>|/path/to/program [args...]</code>
1276 <p>This mode allows an external program to be used which acts as a
1277 pipe to a particular input device; the program is sent the standard
1278 prompt text used for the <code>builtin</code> mode on
1279 <code>stdin</code>, and is expected to write password strings on
1280 <code>stdout</code>. If several passwords are needed (or an
1281 incorrect password is entered), additional prompt text will be
1282 written subsequent to the first password being returned, and more
1283 passwords must then be written back.</p></li>
1285 <li><code>exec:/path/to/program</code>
1287 Here an external program is configured which is called at startup for each
1288 encrypted Private Key file. It is called with one argument, a string of the
1289 form ``<code>servername:portnumber:index</code>'' (with <code>index</code>
1290 being a zero-based sequence number), which indicates for which server,
1291 TCP port and certificate number it has to print the corresponding
1292 Pass Phrase to <code>stdout</code>. The intent is that this external
1293 program first runs security checks to make sure that the system is not
1294 compromised by an attacker, and only when these checks were passed
1295 successfully it provides the Pass Phrase.</p>
1297 Both these security checks, and the way the Pass Phrase is determined, can
1298 be as complex as you like. Mod_ssl just defines the interface: an
1299 executable program which provides the Pass Phrase on <code>stdout</code>.
1300 Nothing more or less! So, if you're really paranoid about security, here
1301 is your interface. Anything else has to be left as an exercise to the
1302 administrator, because local security requirements are so different.</p>
1304 The reuse-algorithm above is used here, too. In other words: The external
1305 program is called only once per unique Pass Phrase.</p></li>
1307 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLPassPhraseDialog exec:/usr/local/apache/sbin/pp-filter</pre>
1311 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1312 <div class="directive-section"><h2><a name="SSLProtocol" id="SSLProtocol">SSLProtocol</a> <a name="sslprotocol" id="sslprotocol">Directive</a></h2>
1313 <table class="directive">
1314 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Configure usable SSL/TLS protocol versions</td></tr>
1315 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLProtocol [+|-]<em>protocol</em> ...</code></td></tr>
1316 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLProtocol all</code></td></tr>
1317 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
1318 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1319 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1322 This directive can be used to control which versions of the SSL/TLS protocol
1323 will be accepted in new connections.</p>
1325 The available (case-insensitive) <em>protocol</em>s are:</p>
1327 <li><code>SSLv3</code>
1329 This is the Secure Sockets Layer (SSL) protocol, version 3.0, from
1330 the Netscape Corporation.
1331 It is the successor to SSLv2 and the predecessor to TLSv1.</p></li>
1333 <li><code>TLSv1</code>
1335 This is the Transport Layer Security (TLS) protocol, version 1.0.
1336 It is the successor to SSLv3 and is defined in
1337 <a href="http://www.ietf.org/rfc/rfc2246.txt">RFC 2246</a>.
1338 It is supported by nearly every client.</p></li>
1340 <li><code>TLSv1.1</code> (when using OpenSSL 1.0.1 and later)
1342 A revision of the TLS 1.0 protocol, as defined in
1343 <a href="http://www.ietf.org/rfc/rfc4346.txt">RFC 4346</a>.</p></li>
1345 <li><code>TLSv1.2</code> (when using OpenSSL 1.0.1 and later)
1347 A revision of the TLS 1.1 protocol, as defined in
1348 <a href="http://www.ietf.org/rfc/rfc5246.txt">RFC 5246</a>.</p></li>
1350 <li><code>all</code>
1352 This is a shortcut for ``<code>+SSLv3 +TLSv1</code>'' or
1353 - when using OpenSSL 1.0.1 and later -
1354 ``<code>+SSLv3 +TLSv1 +TLSv1.1 +TLSv1.2</code>, respectively.</p></li>
1356 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLProtocol TLSv1</pre>
1360 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1361 <div class="directive-section"><h2><a name="SSLProxyCACertificateFile" id="SSLProxyCACertificateFile">SSLProxyCACertificateFile</a> <a name="sslproxycacertificatefile" id="sslproxycacertificatefile">Directive</a></h2>
1362 <table class="directive">
1363 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>File of concatenated PEM-encoded CA Certificates
1364 for Remote Server Auth</td></tr>
1365 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLProxyCACertificateFile <em>file-path</em></code></td></tr>
1366 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
1367 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1368 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1371 This directive sets the <em>all-in-one</em> file where you can assemble the
1372 Certificates of Certification Authorities (CA) whose <em>remote servers</em> you deal
1373 with. These are used for Remote Server Authentication. Such a file is simply the
1374 concatenation of the various PEM-encoded Certificate files, in order of
1375 preference. This can be used alternatively and/or additionally to
1376 <code class="directive"><a href="#sslproxycacertificatepath">SSLProxyCACertificatePath</a></code>.</p>
1377 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLProxyCACertificateFile /usr/local/apache2/conf/ssl.crt/ca-bundle-remote-server.crt</pre>
1381 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1382 <div class="directive-section"><h2><a name="SSLProxyCACertificatePath" id="SSLProxyCACertificatePath">SSLProxyCACertificatePath</a> <a name="sslproxycacertificatepath" id="sslproxycacertificatepath">Directive</a></h2>
1383 <table class="directive">
1384 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Directory of PEM-encoded CA Certificates for
1385 Remote Server Auth</td></tr>
1386 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLProxyCACertificatePath <em>directory-path</em></code></td></tr>
1387 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
1388 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1389 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1392 This directive sets the directory where you keep the Certificates of
1393 Certification Authorities (CAs) whose remote servers you deal with. These are used to
1394 verify the remote server certificate on Remote Server Authentication.</p>
1396 The files in this directory have to be PEM-encoded and are accessed through
1397 hash filenames. So usually you can't just place the Certificate files
1398 there: you also have to create symbolic links named
1399 <em>hash-value</em><code>.N</code>. And you should always make sure this directory
1400 contains the appropriate symbolic links.</p>
1401 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLProxyCACertificatePath /usr/local/apache2/conf/ssl.crt/</pre>
1405 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1406 <div class="directive-section"><h2><a name="SSLProxyCARevocationCheck" id="SSLProxyCARevocationCheck">SSLProxyCARevocationCheck</a> <a name="sslproxycarevocationcheck" id="sslproxycarevocationcheck">Directive</a></h2>
1407 <table class="directive">
1408 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable CRL-based revocation checking for Remote Server Auth</td></tr>
1409 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLProxyCARevocationCheck chain|leaf|none</code></td></tr>
1410 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLProxyCARevocationCheck none</code></td></tr>
1411 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
1412 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1413 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1416 Enables certificate revocation list (CRL) checking for the
1417 <em>remote servers</em> you deal with. At least one of
1418 <code class="directive"><a href="#sslproxycarevocationfile">SSLProxyCARevocationFile</a></code>
1419 or <code class="directive"><a href="#sslproxycarevocationpath">SSLProxyCARevocationPath</a></code> must be
1420 configured. When set to <code>chain</code> (recommended setting),
1421 CRL checks are applied to all certificates in the chain, while setting it to
1422 <code>leaf</code> limits the checks to the end-entity cert.
1425 <h3>When set to <code>chain</code> or <code>leaf</code>,
1426 CRLs <em>must</em> be available for successful validation</h3>
1428 Prior to version 2.3.15, CRL checking in mod_ssl also succeeded when
1429 no CRL(s) were found in any of the locations configured with
1430 <code class="directive"><a href="#sslproxycarevocationfile">SSLProxyCARevocationFile</a></code>
1431 or <code class="directive"><a href="#sslproxycarevocationpath">SSLProxyCARevocationPath</a></code>.
1432 With the introduction of this directive, the behavior has been changed:
1433 when checking is enabled, CRLs <em>must</em> be present for the validation
1434 to succeed - otherwise it will fail with an
1435 <code>"unable to get certificate CRL"</code> error.
1438 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLProxyCARevocationCheck chain</pre>
1442 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1443 <div class="directive-section"><h2><a name="SSLProxyCARevocationFile" id="SSLProxyCARevocationFile">SSLProxyCARevocationFile</a> <a name="sslproxycarevocationfile" id="sslproxycarevocationfile">Directive</a></h2>
1444 <table class="directive">
1445 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>File of concatenated PEM-encoded CA CRLs for
1446 Remote Server Auth</td></tr>
1447 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLProxyCARevocationFile <em>file-path</em></code></td></tr>
1448 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
1449 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1450 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1453 This directive sets the <em>all-in-one</em> file where you can
1454 assemble the Certificate Revocation Lists (CRL) of Certification
1455 Authorities (CA) whose <em>remote servers</em> you deal with. These are used
1456 for Remote Server Authentication. Such a file is simply the concatenation of
1457 the various PEM-encoded CRL files, in order of preference. This can be
1458 used alternatively and/or additionally to <code class="directive"><a href="#sslproxycarevocationpath">SSLProxyCARevocationPath</a></code>.</p>
1459 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLProxyCARevocationFile /usr/local/apache2/conf/ssl.crl/ca-bundle-remote-server.crl</pre>
1463 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1464 <div class="directive-section"><h2><a name="SSLProxyCARevocationPath" id="SSLProxyCARevocationPath">SSLProxyCARevocationPath</a> <a name="sslproxycarevocationpath" id="sslproxycarevocationpath">Directive</a></h2>
1465 <table class="directive">
1466 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Directory of PEM-encoded CA CRLs for
1467 Remote Server Auth</td></tr>
1468 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLProxyCARevocationPath <em>directory-path</em></code></td></tr>
1469 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
1470 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1471 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1474 This directive sets the directory where you keep the Certificate Revocation
1475 Lists (CRL) of Certification Authorities (CAs) whose remote servers you deal with.
1476 These are used to revoke the remote server certificate on Remote Server Authentication.</p>
1478 The files in this directory have to be PEM-encoded and are accessed through
1479 hash filenames. So usually you have not only to place the CRL files there.
1480 Additionally you have to create symbolic links named
1481 <em>hash-value</em><code>.rN</code>. And you should always make sure this directory
1482 contains the appropriate symbolic links.</p>
1483 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLProxyCARevocationPath /usr/local/apache2/conf/ssl.crl/</pre>
1487 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1488 <div class="directive-section"><h2><a name="SSLProxyCheckPeerCN" id="SSLProxyCheckPeerCN">SSLProxyCheckPeerCN</a> <a name="sslproxycheckpeercn" id="sslproxycheckpeercn">Directive</a></h2>
1489 <table class="directive">
1490 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Whether to check the remote server certificate's CN field
1492 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLProxyCheckPeerCN on|off</code></td></tr>
1493 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLProxyCheckPeerCN on</code></td></tr>
1494 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
1495 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1496 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1499 This directive sets whether the remote server certificate's CN field is
1500 compared against the hostname of the request URL. If both are not equal
1501 a 502 status code (Bad Gateway) is sent.
1504 SSLProxyCheckPeerCN has been superseded by
1505 <code class="directive"><a href="#sslproxycheckpeername">SSLProxyCheckPeerName</a></code>, and its
1506 setting is only taken into account when
1507 <code>SSLProxyCheckPeerName off</code> is specified at the same time.
1509 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLProxyCheckPeerCN on</pre>
1513 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1514 <div class="directive-section"><h2><a name="SSLProxyCheckPeerExpire" id="SSLProxyCheckPeerExpire">SSLProxyCheckPeerExpire</a> <a name="sslproxycheckpeerexpire" id="sslproxycheckpeerexpire">Directive</a></h2>
1515 <table class="directive">
1516 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Whether to check if remote server certificate is expired
1518 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLProxyCheckPeerExpire on|off</code></td></tr>
1519 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLProxyCheckPeerExpire on</code></td></tr>
1520 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
1521 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1522 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1525 This directive sets whether it is checked if the remote server certificate
1526 is expired or not. If the check fails a 502 status code (Bad Gateway) is
1529 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLProxyCheckPeerExpire on</pre>
1533 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1534 <div class="directive-section"><h2><a name="SSLProxyCheckPeerName" id="SSLProxyCheckPeerName">SSLProxyCheckPeerName</a> <a name="sslproxycheckpeername" id="sslproxycheckpeername">Directive</a></h2>
1535 <table class="directive">
1536 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Configure host name checking for remote server certificates
1538 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLProxyCheckPeerName on|off</code></td></tr>
1539 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLProxyCheckPeerName on</code></td></tr>
1540 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
1541 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1542 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1545 This directive configures host name checking for server certificates
1546 when mod_ssl is acting as an SSL client. The check will
1547 succeed if the host name from the request URI is found in
1548 either the subjectAltName extension or (one of) the CN attribute(s)
1549 in the certificate's subject. If the check fails, the SSL request
1550 is aborted and a 502 status code (Bad Gateway) is returned.
1551 The directive supersedes <code class="directive"><a href="#sslproxycheckpeercn">SSLProxyCheckPeerCN</a></code>,
1552 which only checks for the expected host name in the first CN attribute.
1555 Wildcard matching is supported in one specific flavor: subjectAltName entries
1556 of type dNSName or CN attributes starting with <code>*.</code> will match
1557 for any DNS name with the same number of labels and the same suffix
1558 (i.e., <code>*.example.org</code> matches for <code>foo.example.org</code>,
1559 but not for <code>foo.bar.example.org</code>).
1563 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1564 <div class="directive-section"><h2><a name="SSLProxyCipherSuite" id="SSLProxyCipherSuite">SSLProxyCipherSuite</a> <a name="sslproxyciphersuite" id="sslproxyciphersuite">Directive</a></h2>
1565 <table class="directive">
1566 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Cipher Suite available for negotiation in SSL
1567 proxy handshake</td></tr>
1568 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLProxyCipherSuite <em>cipher-spec</em></code></td></tr>
1569 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLProxyCipherSuite ALL:!ADH:RC4+RSA:+HIGH:+MEDIUM:+LOW:+EXP</code></td></tr>
1570 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
1571 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>AuthConfig</td></tr>
1572 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1573 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1575 <p>Equivalent to <code>SSLCipherSuite</code>, but for the proxy connection.
1576 Please refer to <code class="directive"><a href="#sslciphersuite">SSLCipherSuite</a></code>
1577 for additional information.</p>
1580 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1581 <div class="directive-section"><h2><a name="SSLProxyEngine" id="SSLProxyEngine">SSLProxyEngine</a> <a name="sslproxyengine" id="sslproxyengine">Directive</a></h2>
1582 <table class="directive">
1583 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>SSL Proxy Engine Operation Switch</td></tr>
1584 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLProxyEngine on|off</code></td></tr>
1585 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLProxyEngine off</code></td></tr>
1586 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
1587 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1588 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1591 This directive toggles the usage of the SSL/TLS Protocol Engine for proxy. This
1592 is usually used inside a <code class="directive"><a href="../mod/core.html#virtualhost"><VirtualHost></a></code> section to enable SSL/TLS for proxy
1593 usage in a particular virtual host. By default the SSL/TLS Protocol Engine is
1594 disabled for proxy both for the main server and all configured virtual hosts.</p>
1596 <p>Note that the SSLProxyEngine directive should not, in
1597 general, be included in a virtual host that will be acting as a
1598 forward proxy (using <Proxy> or <ProxyRequest> directives.
1599 SSLProxyEngine is not required to enable a forward proxy server to
1600 proxy SSL/TLS requests.</p>
1602 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config"><VirtualHost _default_:443>
1605 </VirtualHost></pre>
1609 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1610 <div class="directive-section"><h2><a name="SSLProxyMachineCertificateChainFile" id="SSLProxyMachineCertificateChainFile">SSLProxyMachineCertificateChainFile</a> <a name="sslproxymachinecertificatechainfile" id="sslproxymachinecertificatechainfile">Directive</a></h2>
1611 <table class="directive">
1612 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>File of concatenated PEM-encoded CA certificates to be used by the proxy for choosing a certificate</td></tr>
1613 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLProxyMachineCertificateChainFile <em>filename</em></code></td></tr>
1614 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
1615 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>Not applicable</td></tr>
1616 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1617 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1620 This directive sets the all-in-one file where you keep the certificate chain
1621 for all of the client certs in use. This directive will be needed if the
1622 remote server presents a list of CA certificates that are not direct signers
1623 of one of the configured client certificates.
1626 This referenced file is simply the concatenation of the various PEM-encoded
1627 certificate files. Upon startup, each client certificate configured will
1628 be examined and a chain of trust will be constructed.
1630 <div class="warning"><h3>Security warning</h3>
1631 <p>If this directive is enabled, all of the certificates in the file will be
1632 trusted as if they were also in <code class="directive"><a href="#sslproxycacertificatefile">
1633 SSLProxyCACertificateFile</a></code>.</p>
1635 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLProxyMachineCertificateChainFile /usr/local/apache2/conf/ssl.crt/proxyCA.pem</pre>
1639 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1640 <div class="directive-section"><h2><a name="SSLProxyMachineCertificateFile" id="SSLProxyMachineCertificateFile">SSLProxyMachineCertificateFile</a> <a name="sslproxymachinecertificatefile" id="sslproxymachinecertificatefile">Directive</a></h2>
1641 <table class="directive">
1642 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>File of concatenated PEM-encoded client certificates and keys to be used by the proxy</td></tr>
1643 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLProxyMachineCertificateFile <em>filename</em></code></td></tr>
1644 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
1645 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>Not applicable</td></tr>
1646 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1647 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1650 This directive sets the all-in-one file where you keep the certificates and
1651 keys used for authentication of the proxy server to remote servers.
1654 This referenced file is simply the concatenation of the various PEM-encoded
1655 certificate files, in order of preference. Use this directive alternatively
1656 or additionally to <code>SSLProxyMachineCertificatePath</code>.
1658 <div class="warning">
1659 <p>Currently there is no support for encrypted private keys</p>
1661 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLProxyMachineCertificateFile /usr/local/apache2/conf/ssl.crt/proxy.pem</pre>
1665 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1666 <div class="directive-section"><h2><a name="SSLProxyMachineCertificatePath" id="SSLProxyMachineCertificatePath">SSLProxyMachineCertificatePath</a> <a name="sslproxymachinecertificatepath" id="sslproxymachinecertificatepath">Directive</a></h2>
1667 <table class="directive">
1668 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Directory of PEM-encoded client certificates and keys to be used by the proxy</td></tr>
1669 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLProxyMachineCertificatePath <em>directory</em></code></td></tr>
1670 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
1671 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>Not applicable</td></tr>
1672 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1673 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1676 This directive sets the directory where you keep the certificates and
1677 keys used for authentication of the proxy server to remote servers.
1679 <p>The files in this directory must be PEM-encoded and are accessed through
1680 hash filenames. Additionally, you must create symbolic links named
1681 <code><em>hash-value</em>.N</code>. And you should always make sure this
1682 directory contains the appropriate symbolic links.</p>
1683 <div class="warning">
1684 <p>Currently there is no support for encrypted private keys</p>
1686 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLProxyMachineCertificatePath /usr/local/apache2/conf/proxy.crt/</pre>
1690 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1691 <div class="directive-section"><h2><a name="SSLProxyProtocol" id="SSLProxyProtocol">SSLProxyProtocol</a> <a name="sslproxyprotocol" id="sslproxyprotocol">Directive</a></h2>
1692 <table class="directive">
1693 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Configure usable SSL protocol flavors for proxy usage</td></tr>
1694 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLProxyProtocol [+|-]<em>protocol</em> ...</code></td></tr>
1695 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLProxyProtocol all</code></td></tr>
1696 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
1697 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>Options</td></tr>
1698 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1699 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1703 This directive can be used to control the SSL protocol flavors mod_ssl should
1704 use when establishing its server environment for proxy . It will only connect
1705 to servers using one of the provided protocols.</p>
1706 <p>Please refer to <code class="directive"><a href="#sslprotocol">SSLProtocol</a></code>
1707 for additional information.
1711 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1712 <div class="directive-section"><h2><a name="SSLProxyVerify" id="SSLProxyVerify">SSLProxyVerify</a> <a name="sslproxyverify" id="sslproxyverify">Directive</a></h2>
1713 <table class="directive">
1714 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Type of remote server Certificate verification</td></tr>
1715 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLProxyVerify <em>level</em></code></td></tr>
1716 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLProxyVerify none</code></td></tr>
1717 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
1718 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1719 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1722 <p>When a proxy is configured to forward requests to a remote SSL
1723 server, this directive can be used to configure certificate
1724 verification of the remote server. </p>
1726 The following levels are available for <em>level</em>:</p>
1728 <li><strong>none</strong>:
1729 no remote server Certificate is required at all</li>
1730 <li><strong>optional</strong>:
1731 the remote server <em>may</em> present a valid Certificate</li>
1732 <li><strong>require</strong>:
1733 the remote server <em>has to</em> present a valid Certificate</li>
1734 <li><strong>optional_no_ca</strong>:
1735 the remote server may present a valid Certificate<br />
1736 but it need not to be (successfully) verifiable.</li>
1738 <p>In practice only levels <strong>none</strong> and
1739 <strong>require</strong> are really interesting, because level
1740 <strong>optional</strong> doesn't work with all servers and level
1741 <strong>optional_no_ca</strong> is actually against the idea of
1742 authentication (but can be used to establish SSL test pages, etc.)</p>
1743 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLProxyVerify require</pre>
1747 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1748 <div class="directive-section"><h2><a name="SSLProxyVerifyDepth" id="SSLProxyVerifyDepth">SSLProxyVerifyDepth</a> <a name="sslproxyverifydepth" id="sslproxyverifydepth">Directive</a></h2>
1749 <table class="directive">
1750 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum depth of CA Certificates in Remote Server
1751 Certificate verification</td></tr>
1752 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLProxyVerifyDepth <em>number</em></code></td></tr>
1753 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLProxyVerifyDepth 1</code></td></tr>
1754 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
1755 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1756 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1759 This directive sets how deeply mod_ssl should verify before deciding that the
1760 remote server does not have a valid certificate. </p>
1762 The depth actually is the maximum number of intermediate certificate issuers,
1763 i.e. the number of CA certificates which are max allowed to be followed while
1764 verifying the remote server certificate. A depth of 0 means that self-signed
1765 remote server certificates are accepted only, the default depth of 1 means
1766 the remote server certificate can be self-signed or has to be signed by a CA
1767 which is directly known to the server (i.e. the CA's certificate is under
1768 <code class="directive"><a href="#sslproxycacertificatepath">SSLProxyCACertificatePath</a></code>), etc.</p>
1769 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLProxyVerifyDepth 10</pre>
1773 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1774 <div class="directive-section"><h2><a name="SSLRandomSeed" id="SSLRandomSeed">SSLRandomSeed</a> <a name="sslrandomseed" id="sslrandomseed">Directive</a></h2>
1775 <table class="directive">
1776 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Pseudo Random Number Generator (PRNG) seeding
1778 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLRandomSeed <em>context</em> <em>source</em>
1779 [<em>bytes</em>]</code></td></tr>
1780 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
1781 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1782 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1785 This configures one or more sources for seeding the Pseudo Random Number
1786 Generator (PRNG) in OpenSSL at startup time (<em>context</em> is
1787 <code>startup</code>) and/or just before a new SSL connection is established
1788 (<em>context</em> is <code>connect</code>). This directive can only be used
1789 in the global server context because the PRNG is a global facility.</p>
1791 The following <em>source</em> variants are available:</p>
1793 <li><code>builtin</code>
1794 <p> This is the always available builtin seeding source. Its usage
1795 consumes minimum CPU cycles under runtime and hence can be always used
1796 without drawbacks. The source used for seeding the PRNG contains of the
1797 current time, the current process id and (when applicable) a randomly
1798 chosen 1KB extract of the inter-process scoreboard structure of Apache.
1799 The drawback is that this is not really a strong source and at startup
1800 time (where the scoreboard is still not available) this source just
1801 produces a few bytes of entropy. So you should always, at least for the
1802 startup, use an additional seeding source.</p></li>
1803 <li><code>file:/path/to/source</code>
1805 This variant uses an external file <code>/path/to/source</code> as the
1806 source for seeding the PRNG. When <em>bytes</em> is specified, only the
1807 first <em>bytes</em> number of bytes of the file form the entropy (and
1808 <em>bytes</em> is given to <code>/path/to/source</code> as the first
1809 argument). When <em>bytes</em> is not specified the whole file forms the
1810 entropy (and <code>0</code> is given to <code>/path/to/source</code> as
1811 the first argument). Use this especially at startup time, for instance
1812 with an available <code>/dev/random</code> and/or
1813 <code>/dev/urandom</code> devices (which usually exist on modern Unix
1814 derivatives like FreeBSD and Linux).</p>
1816 <em>But be careful</em>: Usually <code>/dev/random</code> provides only as
1817 much entropy data as it actually has, i.e. when you request 512 bytes of
1818 entropy, but the device currently has only 100 bytes available two things
1819 can happen: On some platforms you receive only the 100 bytes while on
1820 other platforms the read blocks until enough bytes are available (which
1821 can take a long time). Here using an existing <code>/dev/urandom</code> is
1822 better, because it never blocks and actually gives the amount of requested
1823 data. The drawback is just that the quality of the received data may not
1824 be the best.</p></li>
1826 <li><code>exec:/path/to/program</code>
1828 This variant uses an external executable
1829 <code>/path/to/program</code> as the source for seeding the
1830 PRNG. When <em>bytes</em> is specified, only the first
1831 <em>bytes</em> number of bytes of its <code>stdout</code> contents
1832 form the entropy. When <em>bytes</em> is not specified, the
1833 entirety of the data produced on <code>stdout</code> form the
1834 entropy. Use this only at startup time when you need a very strong
1835 seeding with the help of an external program (for instance as in
1836 the example above with the <code>truerand</code> utility you can
1837 find in the mod_ssl distribution which is based on the AT&T
1838 <em>truerand</em> library). Using this in the connection context
1839 slows down the server too dramatically, of course. So usually you
1840 should avoid using external programs in that context.</p></li>
1841 <li><code>egd:/path/to/egd-socket</code> (Unix only)
1843 This variant uses the Unix domain socket of the
1844 external Entropy Gathering Daemon (EGD) (see <a href="http://www.lothar.com/tech/crypto/">http://www.lothar.com/tech
1845 /crypto/</a>) to seed the PRNG. Use this if no random device exists
1846 on your platform.</p></li>
1848 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLRandomSeed startup builtin
1849 SSLRandomSeed startup file:/dev/random
1850 SSLRandomSeed startup file:/dev/urandom 1024
1851 SSLRandomSeed startup exec:/usr/local/bin/truerand 16
1852 SSLRandomSeed connect builtin
1853 SSLRandomSeed connect file:/dev/random
1854 SSLRandomSeed connect file:/dev/urandom 1024</pre>
1858 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1859 <div class="directive-section"><h2><a name="SSLRenegBufferSize" id="SSLRenegBufferSize">SSLRenegBufferSize</a> <a name="sslrenegbuffersize" id="sslrenegbuffersize">Directive</a></h2>
1860 <table class="directive">
1861 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Set the size for the SSL renegotiation buffer</td></tr>
1862 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLRenegBufferSize <var>bytes</var></code></td></tr>
1863 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLRenegBufferSize 131072</code></td></tr>
1864 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory, .htaccess</td></tr>
1865 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>AuthConfig</td></tr>
1866 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1867 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1870 <p>If an SSL renegotiation is required in per-location context, for
1871 example, any use of <code class="directive"><a href="#sslverifyclient">SSLVerifyClient</a></code> in a Directory or
1872 Location block, then <code class="module"><a href="../mod/mod_ssl.html">mod_ssl</a></code> must buffer any HTTP
1873 request body into memory until the new SSL handshake can be performed.
1874 This directive can be used to set the amount of memory that will be
1875 used for this buffer. </p>
1877 <div class="warning"><p>
1878 Note that in many configurations, the client sending the request body
1879 will be untrusted so a denial of service attack by consumption of
1880 memory must be considered when changing this configuration setting.
1883 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLRenegBufferSize 262144</pre>
1887 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
1888 <div class="directive-section"><h2><a name="SSLRequire" id="SSLRequire">SSLRequire</a> <a name="sslrequire" id="sslrequire">Directive</a></h2>
1889 <table class="directive">
1890 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Allow access only when an arbitrarily complex
1891 boolean expression is true</td></tr>
1892 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLRequire <em>expression</em></code></td></tr>
1893 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory, .htaccess</td></tr>
1894 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>AuthConfig</td></tr>
1895 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
1896 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
1899 <div class="note"><h3>SSLRequire is deprecated</h3>
1900 <p><code>SSLRequire</code> is deprecated and should in general be replaced
1901 by <a href="mod_authz_core.html#reqexpr">Require expr</a>. The so called
1902 <a href="../expr.html">ap_expr</a> syntax of <code>Require expr</code> is
1903 a superset of the syntax of <code>SSLRequire</code>, with the following
1906 <p>In <code>SSLRequire</code>, the comparison operators <code><</code>,
1907 <code><=</code>, ... are completely equivalent to the operators
1908 <code>lt</code>, <code>le</code>, ... and work in a somewhat peculiar way that
1909 first compares the length of two strings and then the lexical order.
1910 On the other hand, <a href="../expr.html">ap_expr</a> has two sets of
1911 comparison operators: The operators <code><</code>,
1912 <code><=</code>, ... do lexical string comparison, while the operators
1913 <code>-lt</code>, <code>-le</code>, ... do integer comparison.
1914 For the latter, there are also aliases without the leading dashes:
1915 <code>lt</code>, <code>le</code>, ...
1921 This directive specifies a general access requirement which has to be
1922 fulfilled in order to allow access. It is a very powerful directive because the
1923 requirement specification is an arbitrarily complex boolean expression
1924 containing any number of access checks.</p>
1926 The <em>expression</em> must match the following syntax (given as a BNF
1927 grammar notation):</p>
1929 <pre>expr ::= "<strong>true</strong>" | "<strong>false</strong>"
1930 | "<strong>!</strong>" expr
1931 | expr "<strong>&&</strong>" expr
1932 | expr "<strong>||</strong>" expr
1933 | "<strong>(</strong>" expr "<strong>)</strong>"
1936 comp ::= word "<strong>==</strong>" word | word "<strong>eq</strong>" word
1937 | word "<strong>!=</strong>" word | word "<strong>ne</strong>" word
1938 | word "<strong><</strong>" word | word "<strong>lt</strong>" word
1939 | word "<strong><=</strong>" word | word "<strong>le</strong>" word
1940 | word "<strong>></strong>" word | word "<strong>gt</strong>" word
1941 | word "<strong>>=</strong>" word | word "<strong>ge</strong>" word
1942 | word "<strong>in</strong>" "<strong>{</strong>" wordlist "<strong>}</strong>"
1943 | word "<strong>in</strong>" "<strong>PeerExtList(</strong>" word "<strong>)</strong>"
1944 | word "<strong>=~</strong>" regex
1945 | word "<strong>!~</strong>" regex
1948 | wordlist "<strong>,</strong>" word
1957 variable ::= "<strong>%{</strong>" varname "<strong>}</strong>"
1958 function ::= funcname "<strong>(</strong>" funcargs "<strong>)</strong>"</pre>
1960 <p>For <code>varname</code> any of the variables described in <a href="#envvars">Environment Variables</a> can be used. For
1961 <code>funcname</code> the available functions are listed in
1962 the <a href="../expr.html#functions">ap_expr documentation</a>.</p>
1964 <p>The <em>expression</em> is parsed into an internal machine
1965 representation when the configuration is loaded, and then evaluated
1966 during request processing. In .htaccess context, the <em>expression</em> is
1967 both parsed and executed each time the .htaccess file is encountered during
1968 request processing.</p>
1970 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLRequire ( %{SSL_CIPHER} !~ m/^(EXP|NULL)-/ \
1971 and %{SSL_CLIENT_S_DN_O} eq "Snake Oil, Ltd." \
1972 and %{SSL_CLIENT_S_DN_OU} in {"Staff", "CA", "Dev"} \
1973 and %{TIME_WDAY} -ge 1 and %{TIME_WDAY} -le 5 \
1974 and %{TIME_HOUR} -ge 8 and %{TIME_HOUR} -le 20 ) \
1975 or %{REMOTE_ADDR} =~ m/^192\.76\.162\.[0-9]+$/</pre>
1978 <p>The <code>PeerExtList(<em>object-ID</em>)</code> function expects
1979 to find zero or more instances of the X.509 certificate extension
1980 identified by the given <em>object ID</em> (OID) in the client certificate.
1981 The expression evaluates to true if the left-hand side string matches
1982 exactly against the value of an extension identified with this OID.
1983 (If multiple extensions with the same OID are present, at least one
1984 extension must match).</p>
1986 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLRequire "foobar" in PeerExtList("1.2.3.4.5.6")</pre>
1989 <div class="note"><h3>Notes on the PeerExtList function</h3>
1993 <li><p>The object ID can be specified either as a descriptive
1994 name recognized by the SSL library, such as <code>"nsComment"</code>,
1995 or as a numeric OID, such as <code>"1.2.3.4.5.6"</code>.</p></li>
1997 <li><p>Expressions with types known to the SSL library are rendered to
1998 a string before comparison. For an extension with a type not
1999 recognized by the SSL library, mod_ssl will parse the value if it is
2000 one of the primitive ASN.1 types UTF8String, IA5String, VisibleString,
2001 or BMPString. For an extension of one of these types, the string
2002 value will be converted to UTF-8 if necessary, then compared against
2003 the left-hand-side expression.</p></li>
2011 <li><a href="../env.html">Environment Variables in Apache HTTP Server</a>,
2012 for additional examples.
2014 <li><a href="mod_authz_core.html#reqexpr">Require expr</a></li>
2015 <li><a href="../expr.html">Generic expression syntax in Apache HTTP Server</a>
2019 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
2020 <div class="directive-section"><h2><a name="SSLRequireSSL" id="SSLRequireSSL">SSLRequireSSL</a> <a name="sslrequiressl" id="sslrequiressl">Directive</a></h2>
2021 <table class="directive">
2022 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Deny access when SSL is not used for the
2023 HTTP request</td></tr>
2024 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLRequireSSL</code></td></tr>
2025 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory, .htaccess</td></tr>
2026 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>AuthConfig</td></tr>
2027 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
2028 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
2031 This directive forbids access unless HTTP over SSL (i.e. HTTPS) is enabled for
2032 the current connection. This is very handy inside the SSL-enabled virtual
2033 host or directories for defending against configuration errors that expose
2034 stuff that should be protected. When this directive is present all requests
2035 are denied which are not using SSL.</p>
2036 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLRequireSSL</pre>
2040 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
2041 <div class="directive-section"><h2><a name="SSLSessionCache" id="SSLSessionCache">SSLSessionCache</a> <a name="sslsessioncache" id="sslsessioncache">Directive</a></h2>
2042 <table class="directive">
2043 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Type of the global/inter-process SSL Session
2045 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLSessionCache <em>type</em></code></td></tr>
2046 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLSessionCache none</code></td></tr>
2047 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
2048 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
2049 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
2052 This configures the storage type of the global/inter-process SSL Session
2053 Cache. This cache is an optional facility which speeds up parallel request
2054 processing. For requests to the same server process (via HTTP keep-alive),
2055 OpenSSL already caches the SSL session information locally. But because modern
2056 clients request inlined images and other data via parallel requests (usually
2057 up to four parallel requests are common) those requests are served by
2058 <em>different</em> pre-forked server processes. Here an inter-process cache
2059 helps to avoid unnecessary session handshakes.</p>
2061 The following five storage <em>type</em>s are currently supported:</p>
2063 <li><code>none</code>
2065 <p>This disables the global/inter-process Session Cache. This
2066 will incur a noticeable speed penalty and may cause problems if
2067 using certain browsers, particularly if client certificates are
2068 enabled. This setting is not recommended.</p></li>
2070 <li><code>nonenotnull</code>
2072 <p>This disables any global/inter-process Session Cache. However
2073 it does force OpenSSL to send a non-null session ID to
2074 accommodate buggy clients that require one.</p></li>
2076 <li><code>dbm:/path/to/datafile</code>
2078 <p>This makes use of a DBM hashfile on the local disk to
2079 synchronize the local OpenSSL memory caches of the server
2080 processes. This session cache may suffer reliability issues under
2081 high load. To use this, ensure that
2082 <code class="module"><a href="../mod/mod_socache_dbm.html">mod_socache_dbm</a></code> is loaded.</p></li>
2084 <li><code>shmcb:/path/to/datafile</code>[<code>(</code><em>size</em><code>)</code>]
2086 <p>This makes use of a high-performance cyclic buffer
2087 (approx. <em>size</em> bytes in size) inside a shared memory
2088 segment in RAM (established via <code>/path/to/datafile</code>) to
2089 synchronize the local OpenSSL memory caches of the server
2090 processes. This is the recommended session cache. To use this,
2091 ensure that <code class="module"><a href="../mod/mod_socache_shmcb.html">mod_socache_shmcb</a></code> is loaded.</p></li>
2093 <li><code>dc:UNIX:/path/to/socket</code>
2095 <p>This makes use of the <a href="http://www.distcache.org/">distcache</a> distributed session
2096 caching libraries. The argument should specify the location of
2097 the server or proxy to be used using the distcache address syntax;
2098 for example, <code>UNIX:/path/to/socket</code> specifies a UNIX
2099 domain socket (typically a local dc_client proxy);
2100 <code>IP:server.example.com:9001</code> specifies an IP
2101 address. To use this, ensure that
2102 <code class="module"><a href="../mod/mod_socache_dc.html">mod_socache_dc</a></code> is loaded.</p></li>
2106 <div class="example"><h3>Examples</h3><pre class="prettyprint lang-config">SSLSessionCache dbm:/usr/local/apache/logs/ssl_gcache_data
2107 SSLSessionCache shmcb:/usr/local/apache/logs/ssl_gcache_data(512000)</pre>
2110 <p>The <code>ssl-cache</code> mutex is used to serialize access to
2111 the session cache to prevent corruption. This mutex can be configured
2112 using the <code class="directive"><a href="../mod/core.html#mutex">Mutex</a></code> directive.</p>
2115 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
2116 <div class="directive-section"><h2><a name="SSLSessionCacheTimeout" id="SSLSessionCacheTimeout">SSLSessionCacheTimeout</a> <a name="sslsessioncachetimeout" id="sslsessioncachetimeout">Directive</a></h2>
2117 <table class="directive">
2118 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Number of seconds before an SSL session expires
2119 in the Session Cache</td></tr>
2120 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLSessionCacheTimeout <em>seconds</em></code></td></tr>
2121 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLSessionCacheTimeout 300</code></td></tr>
2122 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
2123 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
2124 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
2127 This directive sets the timeout in seconds for the information stored in the
2128 global/inter-process SSL Session Cache, the OpenSSL internal memory cache and
2129 for sessions resumed by TLS session resumption (RFC 5077).
2130 It can be set as low as 15 for testing, but should be set to higher
2131 values like 300 in real life.</p>
2132 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLSessionCacheTimeout 600</pre>
2136 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
2137 <div class="directive-section"><h2><a name="SSLSessionTicketKeyFile" id="SSLSessionTicketKeyFile">SSLSessionTicketKeyFile</a> <a name="sslsessionticketkeyfile" id="sslsessionticketkeyfile">Directive</a></h2>
2138 <table class="directive">
2139 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Persistent encryption/decryption key for TLS session tickets</td></tr>
2140 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLSessionTicketKeyFile <em>file-path</em></code></td></tr>
2141 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
2142 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
2143 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
2144 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in httpd 2.4.0 and later, if using OpenSSL 0.9.8h or later</td></tr>
2146 <p>Optionally configures a secret key for encrypting and decrypting
2147 TLS session tickets, as defined in
2148 <a href="http://www.ietf.org/rfc/rfc5077.txt">RFC 5077</a>.
2149 Primarily suitable for clustered environments where TLS sessions information
2150 should be shared between multiple nodes. For single-instance httpd setups,
2151 it is recommended to <em>not</em> configure a ticket key file, but to
2152 rely on (random) keys generated by mod_ssl at startup, instead.</p>
2153 <p>The ticket key file must contain 48 bytes of random data,
2154 preferrably created from a high-entropy source. On a Unix-based system,
2155 a ticket key file can be created as follows:</p>
2157 <div class="example"><p><code>
2158 dd if=/dev/random of=/path/to/file.tkey bs=1 count=48
2161 <p>Ticket keys should be rotated (replaced) on a frequent basis,
2162 as this is the only way to invalidate an existing session ticket -
2163 OpenSSL currently doesn't allow to specify a limit for ticket lifetimes.</p>
2165 <div class="warning">
2166 <p>The ticket key file contains sensitive keying material and should
2167 be protected with file permissions similar to those used for
2168 <code class="directive"><a href="#sslcertificatekeyfile">SSLCertificateKeyFile</a></code>.</p>
2172 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
2173 <div class="directive-section"><h2><a name="SSLSessionTickets" id="SSLSessionTickets">SSLSessionTickets</a> <a name="sslsessiontickets" id="sslsessiontickets">Directive</a></h2>
2174 <table class="directive">
2175 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable or disable use of TLS session tickets</td></tr>
2176 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLSessionTickets on|off</code></td></tr>
2177 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLSessionTickets on</code></td></tr>
2178 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
2179 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
2180 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
2181 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in httpd 2.4.11 and later, if using OpenSSL 0.9.8f
2184 <p>This directive allows to enable or disable the use of TLS session tickets
2186 <div class="warning">
2187 <p>TLS session tickets are enabled by default. Using them without restarting
2188 the web server with an appropriate frequency (e.g. daily) compromises perfect
2189 forward secrecy.</p>
2193 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
2194 <div class="directive-section"><h2><a name="SSLSRPUnknownUserSeed" id="SSLSRPUnknownUserSeed">SSLSRPUnknownUserSeed</a> <a name="sslsrpunknownuserseed" id="sslsrpunknownuserseed">Directive</a></h2>
2195 <table class="directive">
2196 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>SRP unknown user seed</td></tr>
2197 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLSRPUnknownUserSeed <em>secret-string</em></code></td></tr>
2198 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
2199 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
2200 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
2201 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in httpd 2.4.4 and later, if using OpenSSL 1.0.1 or
2205 This directive sets the seed used to fake SRP user parameters for unknown
2206 users, to avoid leaking whether a given user exists. Specify a secret
2207 string. If this directive is not used, then Apache will return the
2208 UNKNOWN_PSK_IDENTITY alert to clients who specify an unknown username.
2210 <div class="example"><h3>Example</h3><p><code>
2211 SSLSRPUnknownUserSeed "secret"
2215 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
2216 <div class="directive-section"><h2><a name="SSLSRPVerifierFile" id="SSLSRPVerifierFile">SSLSRPVerifierFile</a> <a name="sslsrpverifierfile" id="sslsrpverifierfile">Directive</a></h2>
2217 <table class="directive">
2218 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Path to SRP verifier file</td></tr>
2219 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLSRPVerifierFile <em>file-path</em></code></td></tr>
2220 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
2221 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
2222 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
2223 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in httpd 2.4.4 and later, if using OpenSSL 1.0.1 or
2227 This directive enables TLS-SRP and sets the path to the OpenSSL SRP (Secure
2228 Remote Password) verifier file containing TLS-SRP usernames, verifiers, salts,
2229 and group parameters.</p>
2230 <div class="example"><h3>Example</h3><p><code>
2231 SSLSRPVerifierFile "/path/to/file.srpv"
2234 The verifier file can be created with the <code>openssl</code> command line
2236 <div class="example"><h3>Creating the SRP verifier file</h3><p><code>
2237 openssl srp -srpvfile passwd.srpv -userinfo "some info" -add username
2239 <p> The value given with the optional <code>-userinfo</code> parameter is
2240 avalable in the <code>SSL_SRP_USERINFO</code> request environment variable.</p>
2244 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
2245 <div class="directive-section"><h2><a name="SSLStaplingCache" id="SSLStaplingCache">SSLStaplingCache</a> <a name="sslstaplingcache" id="sslstaplingcache">Directive</a></h2>
2246 <table class="directive">
2247 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Configures the OCSP stapling cache</td></tr>
2248 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLStaplingCache <em>type</em></code></td></tr>
2249 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
2250 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
2251 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
2252 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available if using OpenSSL 0.9.8h or later</td></tr>
2254 <p>Configures the cache used to store OCSP responses which get included
2255 in the TLS handshake if <code class="directive"><a href="#sslusestapling">SSLUseStapling</a></code>
2256 is enabled. Configuration of a cache is mandatory for OCSP stapling.
2257 With the exception of <code>none</code> and <code>nonenotnull</code>,
2258 the same storage types are supported as with
2259 <code class="directive"><a href="#sslsessioncache">SSLSessionCache</a></code>.</p>
2261 <p>The <code>ssl-stapling</code> mutex is used to serialize access to the
2262 OCSP stapling cache to prevent corruption. This mutex can be configured
2263 using the <code class="directive"><a href="../mod/core.html#mutex">Mutex</a></code> directive.</p>
2266 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
2267 <div class="directive-section"><h2><a name="SSLStaplingErrorCacheTimeout" id="SSLStaplingErrorCacheTimeout">SSLStaplingErrorCacheTimeout</a> <a name="sslstaplingerrorcachetimeout" id="sslstaplingerrorcachetimeout">Directive</a></h2>
2268 <table class="directive">
2269 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Number of seconds before expiring invalid responses in the OCSP stapling cache</td></tr>
2270 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLStaplingErrorCacheTimeout <em>seconds</em></code></td></tr>
2271 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLStaplingErrorCacheTimeout 600</code></td></tr>
2272 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
2273 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
2274 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
2275 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available if using OpenSSL 0.9.8h or later</td></tr>
2277 <p>Sets the timeout in seconds before <em>invalid</em> responses
2278 in the OCSP stapling cache (configured through <code class="directive"><a href="#sslstaplingcache">SSLStaplingCache</a></code>) will expire.
2279 To set the cache timeout for valid responses, see
2280 <code class="directive"><a href="#sslstaplingstandardcachetimeout">SSLStaplingStandardCacheTimeout</a></code>.</p>
2283 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
2284 <div class="directive-section"><h2><a name="SSLStaplingFakeTryLater" id="SSLStaplingFakeTryLater">SSLStaplingFakeTryLater</a> <a name="sslstaplingfaketrylater" id="sslstaplingfaketrylater">Directive</a></h2>
2285 <table class="directive">
2286 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Synthesize "tryLater" responses for failed OCSP stapling queries</td></tr>
2287 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLStaplingFakeTryLater on|off</code></td></tr>
2288 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLStaplingFakeTryLater on</code></td></tr>
2289 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
2290 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
2291 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
2292 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available if using OpenSSL 0.9.8h or later</td></tr>
2294 <p>When enabled and a query to an OCSP responder for stapling
2295 purposes fails, mod_ssl will synthesize a "tryLater" response for the
2296 client. Only effective if <code class="directive"><a href="#sslstaplingreturnrespondererrors">SSLStaplingReturnResponderErrors</a></code>
2297 is also enabled.</p>
2300 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
2301 <div class="directive-section"><h2><a name="SSLStaplingForceURL" id="SSLStaplingForceURL">SSLStaplingForceURL</a> <a name="sslstaplingforceurl" id="sslstaplingforceurl">Directive</a></h2>
2302 <table class="directive">
2303 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Override the OCSP responder URI specified in the certificate's AIA extension</td></tr>
2304 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLStaplingForceURL <em>uri</em></code></td></tr>
2305 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
2306 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
2307 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
2308 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available if using OpenSSL 0.9.8h or later</td></tr>
2310 <p>This directive overrides the URI of an OCSP responder as obtained from
2311 the authorityInfoAccess (AIA) extension of the certificate.
2312 One potential use is when a proxy is used for retrieving OCSP queries.</p>
2315 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
2316 <div class="directive-section"><h2><a name="SSLStaplingResponderTimeout" id="SSLStaplingResponderTimeout">SSLStaplingResponderTimeout</a> <a name="sslstaplingrespondertimeout" id="sslstaplingrespondertimeout">Directive</a></h2>
2317 <table class="directive">
2318 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Timeout for OCSP stapling queries</td></tr>
2319 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLStaplingResponderTimeout <em>seconds</em></code></td></tr>
2320 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLStaplingResponderTimeout 10</code></td></tr>
2321 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
2322 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
2323 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
2324 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available if using OpenSSL 0.9.8h or later</td></tr>
2326 <p>This option sets the timeout for queries to OCSP responders when
2327 <code class="directive"><a href="#sslusestapling">SSLUseStapling</a></code> is enabled
2328 and mod_ssl is querying a responder for OCSP stapling purposes.</p>
2331 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
2332 <div class="directive-section"><h2><a name="SSLStaplingResponseMaxAge" id="SSLStaplingResponseMaxAge">SSLStaplingResponseMaxAge</a> <a name="sslstaplingresponsemaxage" id="sslstaplingresponsemaxage">Directive</a></h2>
2333 <table class="directive">
2334 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum allowable age for OCSP stapling responses</td></tr>
2335 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLStaplingResponseMaxAge <em>seconds</em></code></td></tr>
2336 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLStaplingResponseMaxAge -1</code></td></tr>
2337 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
2338 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
2339 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
2340 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available if using OpenSSL 0.9.8h or later</td></tr>
2342 <p>This option sets the maximum allowable age ("freshness") when
2343 considering OCSP responses for stapling purposes, i.e. when
2344 <code class="directive"><a href="#sslusestapling">SSLUseStapling</a></code> is turned on.
2345 The default value (<code>-1</code>) does not enforce a maximum age,
2346 which means that OCSP responses are considered valid as long as their
2347 <code>nextUpdate</code> field is in the future.</p>
2350 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
2351 <div class="directive-section"><h2><a name="SSLStaplingResponseTimeSkew" id="SSLStaplingResponseTimeSkew">SSLStaplingResponseTimeSkew</a> <a name="sslstaplingresponsetimeskew" id="sslstaplingresponsetimeskew">Directive</a></h2>
2352 <table class="directive">
2353 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum allowable time skew for OCSP stapling response validation</td></tr>
2354 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLStaplingResponseTimeSkew <em>seconds</em></code></td></tr>
2355 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLStaplingResponseTimeSkew 300</code></td></tr>
2356 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
2357 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
2358 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
2359 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available if using OpenSSL 0.9.8h or later</td></tr>
2361 <p>This option sets the maximum allowable time skew when mod_ssl checks the
2362 <code>thisUpdate</code> and <code>nextUpdate</code> fields of OCSP responses
2363 which get included in the TLS handshake (OCSP stapling). Only applicable
2364 if <code class="directive"><a href="#sslusestapling">SSLUseStapling</a></code> is turned on.</p>
2367 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
2368 <div class="directive-section"><h2><a name="SSLStaplingReturnResponderErrors" id="SSLStaplingReturnResponderErrors">SSLStaplingReturnResponderErrors</a> <a name="sslstaplingreturnrespondererrors" id="sslstaplingreturnrespondererrors">Directive</a></h2>
2369 <table class="directive">
2370 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Pass stapling related OCSP errors on to client</td></tr>
2371 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLStaplingReturnResponderErrors on|off</code></td></tr>
2372 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLStaplingReturnResponderErrors on</code></td></tr>
2373 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
2374 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
2375 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
2376 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available if using OpenSSL 0.9.8h or later</td></tr>
2378 <p>When enabled, mod_ssl will pass responses from unsuccessful
2379 stapling related OCSP queries (such as status errors, expired responses etc.)
2380 on to the client. If set to <code>off</code>, no stapled responses
2381 for failed queries will be included in the TLS handshake.</p>
2384 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
2385 <div class="directive-section"><h2><a name="SSLStaplingStandardCacheTimeout" id="SSLStaplingStandardCacheTimeout">SSLStaplingStandardCacheTimeout</a> <a name="sslstaplingstandardcachetimeout" id="sslstaplingstandardcachetimeout">Directive</a></h2>
2386 <table class="directive">
2387 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Number of seconds before expiring responses in the OCSP stapling cache</td></tr>
2388 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLStaplingStandardCacheTimeout <em>seconds</em></code></td></tr>
2389 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLStaplingStandardCacheTimeout 3600</code></td></tr>
2390 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
2391 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
2392 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
2393 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available if using OpenSSL 0.9.8h or later</td></tr>
2395 <p>Sets the timeout in seconds before responses in the OCSP stapling cache
2396 (configured through <code class="directive"><a href="#sslstaplingcache">SSLStaplingCache</a></code>)
2397 will expire. This directive applies to <em>valid</em> responses, while
2398 <code class="directive"><a href="#sslstaplingerrorcachetimeout">SSLStaplingErrorCacheTimeout</a></code> is
2399 used for controlling the timeout for invalid/unavailable responses.
2403 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
2404 <div class="directive-section"><h2><a name="SSLStrictSNIVHostCheck" id="SSLStrictSNIVHostCheck">SSLStrictSNIVHostCheck</a> <a name="sslstrictsnivhostcheck" id="sslstrictsnivhostcheck">Directive</a></h2>
2405 <table class="directive">
2406 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Whether to allow non-SNI clients to access a name-based virtual
2409 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLStrictSNIVHostCheck on|off</code></td></tr>
2410 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLStrictSNIVHostCheck off</code></td></tr>
2411 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
2412 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
2413 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
2416 This directive sets whether a non-SNI client is allowed to access a name-based
2417 virtual host. If set to <code>on</code> in the default name-based virtual
2418 host, clients that are SNI unaware will not be allowed to access <em>any</em>
2419 virtual host, belonging to this particular IP / port combination.
2420 If set to <code>on</code> in any other virtual host, SNI unaware clients
2421 are not allowed to access this particular virtual host.
2424 <div class="warning"><p>
2425 This option is only available if httpd was compiled against an SNI capable
2429 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLStrictSNIVHostCheck on</pre>
2433 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
2434 <div class="directive-section"><h2><a name="SSLUserName" id="SSLUserName">SSLUserName</a> <a name="sslusername" id="sslusername">Directive</a></h2>
2435 <table class="directive">
2436 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Variable name to determine user name</td></tr>
2437 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLUserName <em>varname</em></code></td></tr>
2438 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, directory, .htaccess</td></tr>
2439 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>AuthConfig</td></tr>
2440 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
2441 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
2444 This directive sets the "user" field in the Apache request object.
2445 This is used by lower modules to identify the user with a character
2446 string. In particular, this may cause the environment variable
2447 <code>REMOTE_USER</code> to be set. The <em>varname</em> can be
2448 any of the <a href="#envvars">SSL environment variables</a>.</p>
2450 <p>When the <code>FakeBasicAuth</code> option is enabled, this directive
2451 instead controls the value of the username embedded within the basic
2452 authentication header (see <a href="#ssloptions">SSLOptions</a>).</p>
2454 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLUserName SSL_CLIENT_S_DN_CN</pre>
2458 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
2459 <div class="directive-section"><h2><a name="SSLUseStapling" id="SSLUseStapling">SSLUseStapling</a> <a name="sslusestapling" id="sslusestapling">Directive</a></h2>
2460 <table class="directive">
2461 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable stapling of OCSP responses in the TLS handshake</td></tr>
2462 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLUseStapling on|off</code></td></tr>
2463 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLUseStapling off</code></td></tr>
2464 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
2465 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
2466 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
2467 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available if using OpenSSL 0.9.8h or later</td></tr>
2469 <p>This option enables OCSP stapling, as defined by the "Certificate
2470 Status Request" TLS extension specified in RFC 6066. If enabled (and
2471 requested by the client), mod_ssl will include an OCSP response
2472 for its own certificate in the TLS handshake. Configuring an
2473 <code class="directive"><a href="#sslstaplingcache">SSLStaplingCache</a></code> is a
2474 prerequisite for enabling OCSP stapling.</p>
2476 <p>OCSP stapling relieves the client of querying the OCSP responder
2477 on its own, but it should be noted that with the RFC 6066 specification,
2478 the server's <code>CertificateStatus</code> reply may only include an
2479 OCSP response for a single cert. For server certificates with intermediate
2480 CA certificates in their chain (the typical case nowadays),
2481 stapling in its current implementation therefore only partially achieves the
2482 stated goal of "saving roundtrips and resources" - see also
2483 <a href="http://www.ietf.org/rfc/rfc6961.txt">RFC 6961</a>
2484 (TLS Multiple Certificate Status Extension).
2488 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
2489 <div class="directive-section"><h2><a name="SSLVerifyClient" id="SSLVerifyClient">SSLVerifyClient</a> <a name="sslverifyclient" id="sslverifyclient">Directive</a></h2>
2490 <table class="directive">
2491 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Type of Client Certificate verification</td></tr>
2492 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLVerifyClient <em>level</em></code></td></tr>
2493 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLVerifyClient none</code></td></tr>
2494 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
2495 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>AuthConfig</td></tr>
2496 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
2497 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
2500 This directive sets the Certificate verification level for the Client
2501 Authentication. Notice that this directive can be used both in per-server and
2502 per-directory context. In per-server context it applies to the client
2503 authentication process used in the standard SSL handshake when a connection is
2504 established. In per-directory context it forces a SSL renegotiation with the
2505 reconfigured client verification level after the HTTP request was read but
2506 before the HTTP response is sent.</p>
2508 The following levels are available for <em>level</em>:</p>
2510 <li><strong>none</strong>:
2511 no client Certificate is required at all</li>
2512 <li><strong>optional</strong>:
2513 the client <em>may</em> present a valid Certificate</li>
2514 <li><strong>require</strong>:
2515 the client <em>has to</em> present a valid Certificate</li>
2516 <li><strong>optional_no_ca</strong>:
2517 the client may present a valid Certificate<br />
2518 but it need not to be (successfully) verifiable.</li>
2520 <p>In practice only levels <strong>none</strong> and
2521 <strong>require</strong> are really interesting, because level
2522 <strong>optional</strong> doesn't work with all browsers and level
2523 <strong>optional_no_ca</strong> is actually against the idea of
2524 authentication (but can be used to establish SSL test pages, etc.)</p>
2525 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLVerifyClient require</pre>
2529 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
2530 <div class="directive-section"><h2><a name="SSLVerifyDepth" id="SSLVerifyDepth">SSLVerifyDepth</a> <a name="sslverifydepth" id="sslverifydepth">Directive</a></h2>
2531 <table class="directive">
2532 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum depth of CA Certificates in Client
2533 Certificate verification</td></tr>
2534 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SSLVerifyDepth <em>number</em></code></td></tr>
2535 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SSLVerifyDepth 1</code></td></tr>
2536 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
2537 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>AuthConfig</td></tr>
2538 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
2539 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ssl</td></tr>
2542 This directive sets how deeply mod_ssl should verify before deciding that the
2543 clients don't have a valid certificate. Notice that this directive can be
2544 used both in per-server and per-directory context. In per-server context it
2545 applies to the client authentication process used in the standard SSL
2546 handshake when a connection is established. In per-directory context it forces
2547 a SSL renegotiation with the reconfigured client verification depth after the
2548 HTTP request was read but before the HTTP response is sent.</p>
2550 The depth actually is the maximum number of intermediate certificate issuers,
2551 i.e. the number of CA certificates which are max allowed to be followed while
2552 verifying the client certificate. A depth of 0 means that self-signed client
2553 certificates are accepted only, the default depth of 1 means the client
2554 certificate can be self-signed or has to be signed by a CA which is directly
2555 known to the server (i.e. the CA's certificate is under
2556 <code class="directive"><a href="#sslcacertificatepath">SSLCACertificatePath</a></code>), etc.</p>
2557 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">SSLVerifyDepth 10</pre>
2562 <div class="bottomlang">
2563 <p><span>Available Languages: </span><a href="../en/mod/mod_ssl.html" title="English"> en </a></p>
2564 </div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
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