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26 <div id="page-content">
27 <div id="preamble"><h1>Apache Module mod_session_dbd</h1>
29 <p><span>Available Languages: </span><a href="../en/mod/mod_session_dbd.html" title="English"> en </a></p>
31 <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>DBD/SQL based session support</td></tr>
32 <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
33 <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>session_dbd_module</td></tr>
34 <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_session_dbd.c</td></tr>
35 <tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.3 and later</td></tr></table>
38 <div class="warning"><h3>Warning</h3>
39 <p>The session modules make use of HTTP cookies, and as such can fall
40 victim to Cross Site Scripting attacks, or expose potentially private
41 information to clients. Please ensure that the relevant risks have
42 been taken into account before enabling the session functionality on
46 <p>This submodule of <code class="module"><a href="../mod/mod_session.html">mod_session</a></code> provides support for the
47 storage of user sessions within a SQL database using the
48 <code class="module"><a href="../mod/mod_dbd.html">mod_dbd</a></code> module.</p>
50 <p>Sessions can either be <strong>anonymous</strong>, where the session is
51 keyed by a unique UUID string stored on the browser in a cookie, or
52 <strong>per user</strong>, where the session is keyed against the userid of
53 the logged in user.</p>
55 <p>SQL based sessions are hidden from the browser, and so offer a measure of
56 privacy without the need for encryption.</p>
58 <p>Different webservers within a server farm may choose to share a database,
59 and so share sessions with one another.</p>
61 <p>For more details on the session interface, see the documentation for
62 the <code class="module"><a href="../mod/mod_session.html">mod_session</a></code> module.</p>
65 <div id="quickview"><h3>Topics</h3>
67 <li><img alt="" src="../images/down.gif" /> <a href="#dbdconfig">DBD Configuration</a></li>
68 <li><img alt="" src="../images/down.gif" /> <a href="#anonymous">Anonymous Sessions</a></li>
69 <li><img alt="" src="../images/down.gif" /> <a href="#peruser">Per User Sessions</a></li>
70 <li><img alt="" src="../images/down.gif" /> <a href="#housekeeping">Database Housekeeping</a></li>
71 </ul><h3 class="directives">Directives</h3>
73 <li><img alt="" src="../images/down.gif" /> <a href="#sessiondbdcookiename">SessionDBDCookieName</a></li>
74 <li><img alt="" src="../images/down.gif" /> <a href="#sessiondbdcookiename2">SessionDBDCookieName2</a></li>
75 <li><img alt="" src="../images/down.gif" /> <a href="#sessiondbdcookieremove">SessionDBDCookieRemove</a></li>
76 <li><img alt="" src="../images/down.gif" /> <a href="#sessiondbddeletelabel">SessionDBDDeleteLabel</a></li>
77 <li><img alt="" src="../images/down.gif" /> <a href="#sessiondbdinsertlabel">SessionDBDInsertLabel</a></li>
78 <li><img alt="" src="../images/down.gif" /> <a href="#sessiondbdperuser">SessionDBDPerUser</a></li>
79 <li><img alt="" src="../images/down.gif" /> <a href="#sessiondbdselectlabel">SessionDBDSelectLabel</a></li>
80 <li><img alt="" src="../images/down.gif" /> <a href="#sessiondbdupdatelabel">SessionDBDUpdateLabel</a></li>
82 <h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_session_dbd">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_session_dbd">Report a bug</a></li></ul><h3>See also</h3>
84 <li><code class="module"><a href="../mod/mod_session.html">mod_session</a></code></li>
85 <li><code class="module"><a href="../mod/mod_session_crypto.html">mod_session_crypto</a></code></li>
86 <li><code class="module"><a href="../mod/mod_session_cookie.html">mod_session_cookie</a></code></li>
87 <li><code class="module"><a href="../mod/mod_dbd.html">mod_dbd</a></code></li>
88 </ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
89 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
91 <h2><a name="dbdconfig" id="dbdconfig">DBD Configuration</a></h2>
93 <p>Before the <code class="module"><a href="../mod/mod_session_dbd.html">mod_session_dbd</a></code> module can be configured to maintain a
94 session, the <code class="module"><a href="../mod/mod_dbd.html">mod_dbd</a></code> module must be configured to make the various database queries
95 available to the server.</p>
97 <p>There are four queries required to keep a session maintained, to select an existing session,
98 to update an existing session, to insert a new session, and to delete an expired or empty
99 session. These queries are configured as per the example below.</p>
101 <div class="example"><h3>Sample DBD configuration</h3><pre class="prettyprint lang-config">DBDriver pgsql
102 DBDParams "dbname=apachesession user=apache password=xxxxx host=localhost"
103 DBDPrepareSQL "delete from session where key = %s" deletesession
104 DBDPrepareSQL "update session set value = %s, expiry = %lld, key = %s where key = %s" updatesession
105 DBDPrepareSQL "insert into session (value, expiry, key) values (%s, %lld, %s)" insertsession
106 DBDPrepareSQL "select value from session where key = %s and (expiry = 0 or expiry > %lld)" selectsession
107 DBDPrepareSQL "delete from session where expiry != 0 and expiry < %lld" cleansession</pre>
110 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
111 <div class="section">
112 <h2><a name="anonymous" id="anonymous">Anonymous Sessions</a></h2>
114 <p>Anonymous sessions are keyed against a unique UUID, and stored on the
115 browser within an HTTP cookie. This method is similar to that used by most
116 application servers to store session information.</p>
118 <p>To create a simple anonymous session and store it in a postgres database
119 table called <var>apachesession</var>, and save the session ID in a cookie
120 called <var>session</var>, configure the session as follows:</p>
122 <div class="example"><h3>SQL based anonymous session</h3><pre class="prettyprint lang-config">Session On
123 SessionDBDCookieName session path=/</pre>
126 <p>For more examples on how the session can be configured to be read
127 from and written to by a CGI application, see the
128 <code class="module"><a href="../mod/mod_session.html">mod_session</a></code> examples section.</p>
130 <p>For documentation on how the session can be used to store username
131 and password details, see the <code class="module"><a href="../mod/mod_auth_form.html">mod_auth_form</a></code> module.</p>
133 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
134 <div class="section">
135 <h2><a name="peruser" id="peruser">Per User Sessions</a></h2>
137 <p>Per user sessions are keyed against the username of a successfully
138 authenticated user. It offers the most privacy, as no external handle
139 to the session exists outside of the authenticated realm.</p>
141 <p>Per user sessions work within a correctly configured authenticated
142 environment, be that using basic authentication, digest authentication
143 or SSL client certificates. Due to the limitations of who came first,
144 the chicken or the egg, per user sessions cannot be used to store
145 authentication credentials from a module like
146 <code class="module"><a href="../mod/mod_auth_form.html">mod_auth_form</a></code>.</p>
148 <p>To create a simple per user session and store it in a postgres database
149 table called <var>apachesession</var>, and with the session keyed to the
150 userid, configure the session as follows:</p>
152 <div class="example"><h3>SQL based per user session</h3><pre class="prettyprint lang-config">Session On
153 SessionDBDPerUser On</pre>
156 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
157 <div class="section">
158 <h2><a name="housekeeping" id="housekeeping">Database Housekeeping</a></h2>
159 <p>Over the course of time, the database can be expected to start accumulating
160 expired sessions. At this point, the <code class="module"><a href="../mod/mod_session_dbd.html">mod_session_dbd</a></code> module
161 is not yet able to handle session expiry automatically.</p>
163 <div class="warning"><h3>Warning</h3>
164 <p>The administrator will need to set up an external process via cron to clean
165 out expired sessions.</p>
169 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
170 <div class="directive-section"><h2><a name="SessionDBDCookieName" id="SessionDBDCookieName">SessionDBDCookieName</a> <a name="sessiondbdcookiename" id="sessiondbdcookiename">Directive</a></h2>
171 <table class="directive">
172 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Name and attributes for the RFC2109 cookie storing the session ID</td></tr>
173 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SessionDBDCookieName <var>name</var> <var>attributes</var></code></td></tr>
174 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</code></td></tr>
175 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
176 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
177 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_session_dbd</td></tr>
179 <p>The <code class="directive">SessionDBDCookieName</code> directive specifies the name and
180 optional attributes of an RFC2109 compliant cookie inside which the session ID will
181 be stored. RFC2109 cookies are set using the <code>Set-Cookie</code> HTTP header.
184 <p>An optional list of cookie attributes can be specified, as per the example below.
185 These attributes are inserted into the cookie as is, and are not interpreted by
186 Apache. Ensure that your attributes are defined correctly as per the cookie specification.
189 <div class="example"><h3>Cookie with attributes</h3><pre class="prettyprint lang-config">Session On
190 SessionDBDCookieName session path=/private;domain=example.com;httponly;secure;version=1;</pre>
195 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
196 <div class="directive-section"><h2><a name="SessionDBDCookieName2" id="SessionDBDCookieName2">SessionDBDCookieName2</a> <a name="sessiondbdcookiename2" id="sessiondbdcookiename2">Directive</a></h2>
197 <table class="directive">
198 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Name and attributes for the RFC2965 cookie storing the session ID</td></tr>
199 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SessionDBDCookieName2 <var>name</var> <var>attributes</var></code></td></tr>
200 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</code></td></tr>
201 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
202 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
203 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_session_dbd</td></tr>
205 <p>The <code class="directive">SessionDBDCookieName2</code> directive specifies the name and
206 optional attributes of an RFC2965 compliant cookie inside which the session ID will
207 be stored. RFC2965 cookies are set using the <code>Set-Cookie2</code> HTTP header.
210 <p>An optional list of cookie attributes can be specified, as per the example below.
211 These attributes are inserted into the cookie as is, and are not interpreted by
212 Apache. Ensure that your attributes are defined correctly as per the cookie specification.
215 <div class="example"><h3>Cookie2 with attributes</h3><pre class="prettyprint lang-config">Session On
216 SessionDBDCookieName2 session path=/private;domain=example.com;httponly;secure;version=1;</pre>
221 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
222 <div class="directive-section"><h2><a name="SessionDBDCookieRemove" id="SessionDBDCookieRemove">SessionDBDCookieRemove</a> <a name="sessiondbdcookieremove" id="sessiondbdcookieremove">Directive</a></h2>
223 <table class="directive">
224 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Control for whether session ID cookies should be removed from incoming HTTP headers</td></tr>
225 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SessionDBDCookieRemove On|Off</code></td></tr>
226 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SessionDBDCookieRemove On</code></td></tr>
227 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
228 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
229 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_session_dbd</td></tr>
231 <p>The <code class="directive">SessionDBDCookieRemove</code> flag controls whether the cookies
232 containing the session ID will be removed from the headers during request processing.</p>
234 <p>In a reverse proxy situation where the Apache server acts as a server frontend for
235 a backend origin server, revealing the contents of the session ID cookie to the backend
236 could be a potential privacy violation. When set to on, the session ID cookie will be
237 removed from the incoming HTTP headers.</p>
241 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
242 <div class="directive-section"><h2><a name="SessionDBDDeleteLabel" id="SessionDBDDeleteLabel">SessionDBDDeleteLabel</a> <a name="sessiondbddeletelabel" id="sessiondbddeletelabel">Directive</a></h2>
243 <table class="directive">
244 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The SQL query to use to remove sessions from the database</td></tr>
245 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SessionDBDDeleteLabel <var>label</var></code></td></tr>
246 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SessionDBDDeleteLabel deletesession</code></td></tr>
247 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
248 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
249 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_session_dbd</td></tr>
251 <p>The <code class="directive">SessionDBDDeleteLabel</code> directive sets the default delete
252 query label to be used to delete an expired or empty session. This label must have been previously
253 defined using the <code class="directive"><a href="../mod/mod_dbd.html#dbdpreparesql">DBDPrepareSQL</a></code> directive.</p>
257 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
258 <div class="directive-section"><h2><a name="SessionDBDInsertLabel" id="SessionDBDInsertLabel">SessionDBDInsertLabel</a> <a name="sessiondbdinsertlabel" id="sessiondbdinsertlabel">Directive</a></h2>
259 <table class="directive">
260 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The SQL query to use to insert sessions into the database</td></tr>
261 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SessionDBDInsertLabel <var>label</var></code></td></tr>
262 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SessionDBDInsertLabel insertsession</code></td></tr>
263 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
264 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
265 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_session_dbd</td></tr>
267 <p>The <code class="directive">SessionDBDInsertLabel</code> directive sets the default insert
268 query label to be used to load in a session. This label must have been previously defined using the
269 <code class="directive"><a href="../mod/mod_dbd.html#dbdpreparesql">DBDPrepareSQL</a></code> directive.</p>
271 <p>If an attempt to update the session affects no rows, this query will be called to insert the
272 session into the database.</p>
276 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
277 <div class="directive-section"><h2><a name="SessionDBDPerUser" id="SessionDBDPerUser">SessionDBDPerUser</a> <a name="sessiondbdperuser" id="sessiondbdperuser">Directive</a></h2>
278 <table class="directive">
279 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable a per user session</td></tr>
280 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SessionDBDPerUser On|Off</code></td></tr>
281 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SessionDBDPerUser Off</code></td></tr>
282 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
283 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
284 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_session_dbd</td></tr>
286 <p>The <code class="directive">SessionDBDPerUser</code> flag enables a per user session keyed
287 against the user's login name. If the user is not logged in, this directive will be
292 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
293 <div class="directive-section"><h2><a name="SessionDBDSelectLabel" id="SessionDBDSelectLabel">SessionDBDSelectLabel</a> <a name="sessiondbdselectlabel" id="sessiondbdselectlabel">Directive</a></h2>
294 <table class="directive">
295 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The SQL query to use to select sessions from the database</td></tr>
296 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SessionDBDSelectLabel <var>label</var></code></td></tr>
297 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SessionDBDSelectLabel selectsession</code></td></tr>
298 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
299 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
300 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_session_dbd</td></tr>
302 <p>The <code class="directive">SessionDBDSelectLabel</code> directive sets the default select
303 query label to be used to load in a session. This label must have been previously defined using the
304 <code class="directive"><a href="../mod/mod_dbd.html#dbdpreparesql">DBDPrepareSQL</a></code> directive.</p>
308 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
309 <div class="directive-section"><h2><a name="SessionDBDUpdateLabel" id="SessionDBDUpdateLabel">SessionDBDUpdateLabel</a> <a name="sessiondbdupdatelabel" id="sessiondbdupdatelabel">Directive</a></h2>
310 <table class="directive">
311 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The SQL query to use to update existing sessions in the database</td></tr>
312 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SessionDBDUpdateLabel <var>label</var></code></td></tr>
313 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SessionDBDUpdateLabel updatesession</code></td></tr>
314 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
315 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
316 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_session_dbd</td></tr>
318 <p>The <code class="directive">SessionDBDUpdateLabel</code> directive sets the default update
319 query label to be used to load in a session. This label must have been previously defined using the
320 <code class="directive"><a href="../mod/mod_dbd.html#dbdpreparesql">DBDPrepareSQL</a></code> directive.</p>
322 <p>If an attempt to update the session affects no rows, the insert query will be
323 called to insert the session into the database. If the database supports InsertOrUpdate,
324 override this query to perform the update in one query instead of two.</p>
329 <div class="bottomlang">
330 <p><span>Available Languages: </span><a href="../en/mod/mod_session_dbd.html" title="English"> en </a></p>
331 </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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