1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 * _ __ ___ ___ __| | ___ ___| | mod_ssl
19 * | '_ ` _ \ / _ \ / _` | / __/ __| | Apache Interface to OpenSSL
20 * | | | | | | (_) | (_| | \__ \__ \ |
21 * |_| |_| |_|\___/ \__,_|___|___/___/_|
24 * Apache API interface structures
27 #include "ssl_private.h"
30 #include "util_mutex.h"
34 * the table of configuration directives we provide
37 #define SSL_CMD_ALL(name, args, desc) \
38 AP_INIT_##args("SSL"#name, ssl_cmd_SSL##name, \
39 NULL, RSRC_CONF|OR_AUTHCFG, desc),
41 #define SSL_CMD_SRV(name, args, desc) \
42 AP_INIT_##args("SSL"#name, ssl_cmd_SSL##name, \
43 NULL, RSRC_CONF, desc),
45 #define SSL_CMD_DIR(name, type, args, desc) \
46 AP_INIT_##args("SSL"#name, ssl_cmd_SSL##name, \
47 NULL, OR_##type, desc),
49 #define AP_END_CMD { NULL }
51 static const command_rec ssl_config_cmds[] = {
53 * Global (main-server) context configuration directives
55 SSL_CMD_SRV(Mutex, TAKE1, AP_ALL_AVAILABLE_MUTEXES_STRING)
56 SSL_CMD_SRV(PassPhraseDialog, TAKE1,
57 "SSL dialog mechanism for the pass phrase query "
58 "(`builtin', `|/path/to/pipe_program`, "
59 "or `exec:/path/to/cgi_program')")
60 SSL_CMD_SRV(SessionCache, TAKE1,
61 "SSL Session Cache storage "
62 "(`none', `nonenotnull', `dbm:/path/to/file')")
63 #if defined(HAVE_OPENSSL_ENGINE_H) && defined(HAVE_ENGINE_INIT)
64 SSL_CMD_SRV(CryptoDevice, TAKE1,
65 "SSL external Crypto Device usage "
68 SSL_CMD_SRV(RandomSeed, TAKE23,
69 "SSL Pseudo Random Number Generator (PRNG) seeding source "
70 "(`startup|connect builtin|file:/path|exec:/path [bytes]')")
73 * Per-server context configuration directives
75 SSL_CMD_SRV(Engine, TAKE1,
76 "SSL switch for the protocol engine "
78 SSL_CMD_ALL(CipherSuite, TAKE1,
79 "Colon-delimited list of permitted SSL Ciphers "
80 "(`XXX:...:XXX' - see manual)")
81 SSL_CMD_SRV(CertificateFile, TAKE1,
82 "SSL Server Certificate file "
83 "(`/path/to/file' - PEM or DER encoded)")
84 SSL_CMD_SRV(CertificateKeyFile, TAKE1,
85 "SSL Server Private Key file "
86 "(`/path/to/file' - PEM or DER encoded)")
87 SSL_CMD_SRV(CertificateChainFile, TAKE1,
88 "SSL Server CA Certificate Chain file "
89 "(`/path/to/file' - PEM encoded)")
90 SSL_CMD_SRV(PKCS7CertificateFile, TAKE1,
91 "PKCS#7 file containing server certificate and chain"
92 " certificates (`/path/to/file' - PEM encoded)")
93 SSL_CMD_ALL(CACertificatePath, TAKE1,
94 "SSL CA Certificate path "
95 "(`/path/to/dir' - contains PEM encoded files)")
96 SSL_CMD_ALL(CACertificateFile, TAKE1,
97 "SSL CA Certificate file "
98 "(`/path/to/file' - PEM encoded)")
99 SSL_CMD_SRV(CADNRequestPath, TAKE1,
100 "SSL CA Distinguished Name path "
101 "(`/path/to/dir' - symlink hashes to PEM of acceptable CA names to request)")
102 SSL_CMD_SRV(CADNRequestFile, TAKE1,
103 "SSL CA Distinguished Name file "
104 "(`/path/to/file' - PEM encoded to derive acceptable CA names to request)")
105 SSL_CMD_SRV(CARevocationPath, TAKE1,
106 "SSL CA Certificate Revocation List (CRL) path "
107 "(`/path/to/dir' - contains PEM encoded files)")
108 SSL_CMD_SRV(CARevocationFile, TAKE1,
109 "SSL CA Certificate Revocation List (CRL) file "
110 "(`/path/to/file' - PEM encoded)")
111 SSL_CMD_ALL(VerifyClient, TAKE1,
112 "SSL Client verify type "
113 "(`none', `optional', `require', `optional_no_ca')")
114 SSL_CMD_ALL(VerifyDepth, TAKE1,
115 "SSL Client verify depth "
116 "(`N' - number of intermediate certificates)")
117 SSL_CMD_SRV(SessionCacheTimeout, TAKE1,
118 "SSL Session Cache object lifetime "
119 "(`N' - number of seconds)")
120 SSL_CMD_SRV(Protocol, RAW_ARGS,
121 "Enable or disable various SSL protocols"
122 "(`[+-][SSLv2|SSLv3|TLSv1] ...' - see manual)")
123 SSL_CMD_SRV(HonorCipherOrder, FLAG,
124 "Use the server's cipher ordering preference")
125 SSL_CMD_ALL(UserName, TAKE1,
126 "Set user name to SSL variable value")
127 SSL_CMD_SRV(LogLevelDebugDump, TAKE1,
128 "Include I/O Dump when LogLevel is set to Debug "
129 "([ None (default) | IO (not bytes) | Bytes ])")
132 * Proxy configuration for remote SSL connections
134 SSL_CMD_SRV(ProxyEngine, FLAG,
135 "SSL switch for the proxy protocol engine "
137 SSL_CMD_SRV(ProxyProtocol, RAW_ARGS,
138 "SSL Proxy: enable or disable SSL protocol flavors "
139 "(`[+-][SSLv2|SSLv3|TLSv1] ...' - see manual)")
140 SSL_CMD_SRV(ProxyCipherSuite, TAKE1,
141 "SSL Proxy: colon-delimited list of permitted SSL ciphers "
142 "(`XXX:...:XXX' - see manual)")
143 SSL_CMD_SRV(ProxyVerify, TAKE1,
144 "SSL Proxy: whether to verify the remote certificate "
146 SSL_CMD_SRV(ProxyVerifyDepth, TAKE1,
147 "SSL Proxy: maximum certificate verification depth "
148 "(`N' - number of intermediate certificates)")
149 SSL_CMD_SRV(ProxyCACertificateFile, TAKE1,
150 "SSL Proxy: file containing server certificates "
151 "(`/path/to/file' - PEM encoded certificates)")
152 SSL_CMD_SRV(ProxyCACertificatePath, TAKE1,
153 "SSL Proxy: directory containing server certificates "
154 "(`/path/to/dir' - contains PEM encoded certificates)")
155 SSL_CMD_SRV(ProxyCARevocationPath, TAKE1,
156 "SSL Proxy: CA Certificate Revocation List (CRL) path "
157 "(`/path/to/dir' - contains PEM encoded files)")
158 SSL_CMD_SRV(ProxyCARevocationFile, TAKE1,
159 "SSL Proxy: CA Certificate Revocation List (CRL) file "
160 "(`/path/to/file' - PEM encoded)")
161 SSL_CMD_SRV(ProxyMachineCertificateFile, TAKE1,
162 "SSL Proxy: file containing client certificates "
163 "(`/path/to/file' - PEM encoded certificates)")
164 SSL_CMD_SRV(ProxyMachineCertificatePath, TAKE1,
165 "SSL Proxy: directory containing client certificates "
166 "(`/path/to/dir' - contains PEM encoded certificates)")
169 * Per-directory context configuration directives
171 SSL_CMD_DIR(Options, OPTIONS, RAW_ARGS,
172 "Set one or more options to configure the SSL engine"
173 "(`[+-]option[=value] ...' - see manual)")
174 SSL_CMD_DIR(RequireSSL, AUTHCFG, NO_ARGS,
175 "Require the SSL protocol for the per-directory context "
177 SSL_CMD_DIR(Require, AUTHCFG, RAW_ARGS,
178 "Require a boolean expression to evaluate to true for granting access"
179 "(arbitrary complex boolean expression - see manual)")
181 /* Deprecated directives. */
182 AP_INIT_RAW_ARGS("SSLLog", ap_set_deprecated, NULL, OR_ALL,
183 "SSLLog directive is no longer supported - use ErrorLog."),
184 AP_INIT_RAW_ARGS("SSLLogLevel", ap_set_deprecated, NULL, OR_ALL,
185 "SSLLogLevel directive is no longer supported - use LogLevel."),
191 * the various processing hooks
193 static apr_status_t ssl_cleanup_pre_config(void *data)
196 * Try to kill the internals of the SSL library.
199 #if OPENSSL_VERSION_NUMBER >= 0x00907001
200 /* Corresponds to OPENSSL_load_builtin_modules():
201 * XXX: borrowed from apps.h, but why not CONF_modules_free()
202 * which also invokes CONF_modules_finish()?
204 CONF_modules_unload(1);
207 /* Corresponds to SSL_library_init: */
209 #if HAVE_ENGINE_LOAD_BUILTIN_ENGINES
213 #if OPENSSL_VERSION_NUMBER >= 0x00907001
214 CRYPTO_cleanup_all_ex_data();
219 /* Don't call ERR_free_strings here; ERR_load_*_strings only
220 * actually load the error strings once per process due to static
221 * variable abuse in OpenSSL. */
224 * TODO: determine somewhere we can safely shove out diagnostics
225 * (when enabled) at this late stage in the game:
226 * CRYPTO_mem_leaks_fp(stderr);
231 static int ssl_hook_pre_config(apr_pool_t *pconf,
235 /* We must register the library in full, to ensure our configuration
236 * code can successfully test the SSL environment.
238 CRYPTO_malloc_init();
240 ERR_load_crypto_strings();
242 SSL_load_error_strings();
244 #if HAVE_ENGINE_LOAD_BUILTIN_ENGINES
245 ENGINE_load_builtin_engines();
248 OpenSSL_add_all_algorithms();
249 #if OPENSSL_VERSION_NUMBER >= 0x00907001
250 OPENSSL_load_builtin_modules();
255 * Let us cleanup the ssl library when the module is unloaded
257 apr_pool_cleanup_register(pconf, NULL, ssl_cleanup_pre_config,
258 apr_pool_cleanup_null);
260 /* Register us to handle mod_log_config %c/%x variables */
261 ssl_var_log_config_register(pconf);
263 /* Register to handle mod_status status page generation */
264 ssl_scache_status_register(pconf);
269 static SSLConnRec *ssl_init_connection_ctx(conn_rec *c)
271 SSLConnRec *sslconn = myConnConfig(c);
277 sslconn = apr_pcalloc(c->pool, sizeof(*sslconn));
279 myConnConfigSet(c, sslconn);
284 int ssl_proxy_enable(conn_rec *c)
286 SSLSrvConfigRec *sc = mySrvConfig(c->base_server);
288 SSLConnRec *sslconn = ssl_init_connection_ctx(c);
290 if (!sc->proxy_enabled) {
291 ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c,
292 "SSL Proxy requested for %s but not enabled "
293 "[Hint: SSLProxyEngine]", sc->vhost_id);
298 sslconn->is_proxy = 1;
299 sslconn->disabled = 0;
304 int ssl_engine_disable(conn_rec *c)
306 SSLSrvConfigRec *sc = mySrvConfig(c->base_server);
310 if (sc->enabled == SSL_ENABLED_FALSE) {
314 sslconn = ssl_init_connection_ctx(c);
316 sslconn->disabled = 1;
321 int ssl_init_ssl_connection(conn_rec *c)
323 SSLSrvConfigRec *sc = mySrvConfig(c->base_server);
325 SSLConnRec *sslconn = myConnConfig(c);
330 * Seed the Pseudo Random Number Generator (PRNG)
332 ssl_rand_seed(c->base_server, c->pool, SSL_RSCTX_CONNECT, "");
335 sslconn = ssl_init_connection_ctx(c);
338 mctx = sslconn->is_proxy ? sc->proxy : sc->server;
341 * Create a new SSL connection with the configured server SSL context and
342 * attach this to the socket. Additionally we register this attachment
343 * so we can detach later.
345 if (!(ssl = SSL_new(mctx->ssl_ctx))) {
346 ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c,
347 "Unable to create a new SSL connection from the SSL "
349 ssl_log_ssl_error(APLOG_MARK, APLOG_ERR, c->base_server);
353 return DECLINED; /* XXX */
356 vhost_md5 = ap_md5_binary(c->pool, (unsigned char *)sc->vhost_id,
359 if (!SSL_set_session_id_context(ssl, (unsigned char *)vhost_md5,
360 APR_MD5_DIGESTSIZE*2))
362 ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c,
363 "Unable to set session id context to `%s'", vhost_md5);
364 ssl_log_ssl_error(APLOG_MARK, APLOG_ERR, c->base_server);
368 return DECLINED; /* XXX */
371 SSL_set_app_data(ssl, c);
372 SSL_set_app_data2(ssl, NULL); /* will be request_rec */
377 * Configure callbacks for SSL connection
379 SSL_set_tmp_rsa_callback(ssl, ssl_callback_TmpRSA);
380 SSL_set_tmp_dh_callback(ssl, ssl_callback_TmpDH);
382 SSL_set_verify_result(ssl, X509_V_OK);
384 ssl_io_filter_init(c, ssl);
389 static const char *ssl_hook_http_scheme(const request_rec *r)
391 SSLSrvConfigRec *sc = mySrvConfig(r->server);
393 if (sc->enabled == SSL_ENABLED_FALSE || sc->enabled == SSL_ENABLED_OPTIONAL) {
400 static apr_port_t ssl_hook_default_port(const request_rec *r)
402 SSLSrvConfigRec *sc = mySrvConfig(r->server);
404 if (sc->enabled == SSL_ENABLED_FALSE || sc->enabled == SSL_ENABLED_OPTIONAL) {
411 static int ssl_hook_pre_connection(conn_rec *c, void *csd)
413 SSLSrvConfigRec *sc = mySrvConfig(c->base_server);
414 SSLConnRec *sslconn = myConnConfig(c);
417 * Immediately stop processing if SSL is disabled for this connection
419 if (!(sc && (sc->enabled == SSL_ENABLED_TRUE ||
420 (sslconn && sslconn->is_proxy))))
429 sslconn = ssl_init_connection_ctx(c);
432 if (sslconn->disabled) {
437 * Remember the connection information for
438 * later access inside callback functions
441 ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, c,
442 "Connection to child %ld established "
443 "(server %s)", c->id, sc->vhost_id);
445 return ssl_init_ssl_connection(c);
449 static void ssl_hook_Insert_Filter(request_rec *r)
451 SSLSrvConfigRec *sc = mySrvConfig(r->server);
453 if (sc->enabled == SSL_ENABLED_OPTIONAL) {
454 ap_add_output_filter("UPGRADE_FILTER", NULL, r, r->connection);
459 * the module registration phase
462 static void ssl_register_hooks(apr_pool_t *p)
464 /* ssl_hook_ReadReq needs to use the BrowserMatch settings so must
465 * run after mod_setenvif's post_read_request hook. */
466 static const char *pre_prr[] = { "mod_setenvif.c", NULL };
468 ssl_io_filter_register(p);
470 ap_hook_pre_connection(ssl_hook_pre_connection,NULL,NULL, APR_HOOK_MIDDLE);
471 ap_hook_test_config (ssl_hook_ConfigTest, NULL,NULL, APR_HOOK_MIDDLE);
472 ap_hook_post_config (ssl_init_Module, NULL,NULL, APR_HOOK_MIDDLE);
473 ap_hook_http_scheme (ssl_hook_http_scheme, NULL,NULL, APR_HOOK_MIDDLE);
474 ap_hook_default_port (ssl_hook_default_port, NULL,NULL, APR_HOOK_MIDDLE);
475 ap_hook_pre_config (ssl_hook_pre_config, NULL,NULL, APR_HOOK_MIDDLE);
476 ap_hook_child_init (ssl_init_Child, NULL,NULL, APR_HOOK_MIDDLE);
477 ap_hook_check_user_id (ssl_hook_UserCheck, NULL,NULL, APR_HOOK_FIRST);
478 ap_hook_fixups (ssl_hook_Fixup, NULL,NULL, APR_HOOK_MIDDLE);
479 ap_hook_access_checker(ssl_hook_Access, NULL,NULL, APR_HOOK_MIDDLE);
480 ap_hook_auth_checker (ssl_hook_Auth, NULL,NULL, APR_HOOK_MIDDLE);
481 ap_hook_post_read_request(ssl_hook_ReadReq, pre_prr,NULL, APR_HOOK_MIDDLE);
482 ap_hook_insert_filter (ssl_hook_Insert_Filter, NULL,NULL, APR_HOOK_MIDDLE);
483 /* ap_hook_handler (ssl_hook_Upgrade, NULL,NULL, APR_HOOK_MIDDLE); */
487 APR_REGISTER_OPTIONAL_FN(ssl_proxy_enable);
488 APR_REGISTER_OPTIONAL_FN(ssl_engine_disable);
491 module AP_MODULE_DECLARE_DATA ssl_module = {
492 STANDARD20_MODULE_STUFF,
493 ssl_config_perdir_create, /* create per-dir config structures */
494 ssl_config_perdir_merge, /* merge per-dir config structures */
495 ssl_config_server_create, /* create per-server config structures */
496 ssl_config_server_merge, /* merge per-server config structures */
497 ssl_config_cmds, /* table of configuration directives */
498 ssl_register_hooks /* register hooks */