source: mod_gnutls/src/mod_gnutls.c @ 07d548d

debian/masterdebian/stretch-backportsjessie-backportsupstream
Last change on this file since 07d548d was 07d548d, checked in by Thomas Klute <thomas2.klute@…>, 5 years ago

Properly use SSLProxyEngine option

ssl_proxy_enable now checks if SSLProxyEngine is enabled, and fails with
an error log entry if not. If it is, TLS is enabled in the mod_gnutls
connection structure.

The pre connection hook (mgs_hook_pre_connection) is changed such that
it does not decline any connection whatsoever if TLS proxy is enabled.

Not that actually using TLS in a proxy backend is still unsupported and
will NOT work.

  • Property mode set to 100644
File size: 7.9 KB
Line 
1/**
2 *  Copyright 2004-2005 Paul Querna
3 *  Copyright 2008 Nikos Mavrogiannopoulos
4 *  Copyright 2011 Dash Shendy
5 *
6 *  Licensed under the Apache License, Version 2.0 (the "License");
7 *  you may not use this file except in compliance with the License.
8 *  You may obtain a copy of the License at
9 *
10 *      http://www.apache.org/licenses/LICENSE-2.0
11 *
12 *  Unless required by applicable law or agreed to in writing, software
13 *  distributed under the License is distributed on an "AS IS" BASIS,
14 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 *  See the License for the specific language governing permissions and
16 *  limitations under the License.
17 *
18 */
19
20#include "mod_gnutls.h"
21
22#ifdef APLOG_USE_MODULE
23APLOG_USE_MODULE(gnutls);
24#endif
25
26static void gnutls_hooks(apr_pool_t * p __attribute__((unused)))
27{
28    /* Try Run Post-Config Hook After mod_proxy */
29    static const char * const aszPre[] = { "mod_proxy.c", NULL };
30    ap_hook_post_config(mgs_hook_post_config, aszPre, NULL,
31                        APR_HOOK_REALLY_LAST);
32    /* HTTP Scheme Hook */
33#if USING_2_1_RECENT
34    ap_hook_http_scheme(mgs_hook_http_scheme, NULL, NULL, APR_HOOK_MIDDLE);
35#else
36    ap_hook_http_method(mgs_hook_http_scheme, NULL, NULL, APR_HOOK_MIDDLE);
37#endif
38    /* Default Port Hook */
39    ap_hook_default_port(mgs_hook_default_port, NULL, NULL, APR_HOOK_MIDDLE);
40    /* Pre-Connect Hook */
41    ap_hook_pre_connection(mgs_hook_pre_connection, NULL, NULL,
42                           APR_HOOK_MIDDLE);
43    /* Pre-Config Hook */
44    ap_hook_pre_config(mgs_hook_pre_config, NULL, NULL,
45                       APR_HOOK_MIDDLE);
46    /* Child-Init Hook */
47    ap_hook_child_init(mgs_hook_child_init, NULL, NULL,
48                       APR_HOOK_MIDDLE);
49    /* Authentication Hook */
50    ap_hook_access_checker(mgs_hook_authz, NULL, NULL,
51                           APR_HOOK_REALLY_FIRST);
52    /* Fixups Hook */
53    ap_hook_fixups(mgs_hook_fixups, NULL, NULL, APR_HOOK_REALLY_FIRST);
54
55    /* TODO: HTTP Upgrade Filter */
56    /* ap_register_output_filter ("UPGRADE_FILTER",
57     *          ssl_io_filter_Upgrade, NULL, AP_FTYPE_PROTOCOL + 5);
58     */
59
60    /* Input Filter */
61    ap_register_input_filter(GNUTLS_INPUT_FILTER_NAME, mgs_filter_input,
62                             NULL, AP_FTYPE_CONNECTION + 5);
63    /* Output Filter */
64    ap_register_output_filter(GNUTLS_OUTPUT_FILTER_NAME, mgs_filter_output,
65                              NULL, AP_FTYPE_CONNECTION + 5);
66
67    /* mod_proxy calls these functions */
68    APR_REGISTER_OPTIONAL_FN(ssl_proxy_enable);
69    APR_REGISTER_OPTIONAL_FN(ssl_engine_disable);
70}
71
72int ssl_is_https(conn_rec *c)
73{
74    mgs_srvconf_rec *sc = (mgs_srvconf_rec *)
75        ap_get_module_config(c->base_server->module_config, &gnutls_module);
76    if(sc->enabled == 0 || sc->non_ssl_request == 1) {
77        /* SSL/TLS Disabled or Plain HTTP Connection Detected */
78        return 0;
79    }
80    /* Connection is Using SSL/TLS */
81    return 1;
82}
83
84int ssl_engine_disable(conn_rec *c)
85{
86    mgs_srvconf_rec *sc = (mgs_srvconf_rec *)
87        ap_get_module_config(c->base_server->module_config, &gnutls_module);
88    if(sc->enabled == GNUTLS_ENABLED_FALSE) {
89        return 1;
90    }
91
92    /* disable TLS for this connection */
93    mgs_handle_t *ctxt = (mgs_handle_t *)
94        ap_get_module_config(c->conn_config, &gnutls_module);
95    if (ctxt == NULL)
96    {
97        ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c,
98                      "%s: allocating connection memory", __func__);
99        ctxt = apr_pcalloc(c->pool, sizeof (*ctxt));
100        ap_set_module_config(c->conn_config, &gnutls_module, ctxt);
101    }
102    ctxt->enabled = GNUTLS_ENABLED_FALSE;
103
104    if (c->input_filters)
105        ap_remove_input_filter(c->input_filters);
106    if (c->output_filters)
107        ap_remove_output_filter(c->output_filters);
108
109    return 1;
110}
111
112int ssl_proxy_enable(conn_rec *c)
113{
114    /* check if TLS proxy support is enabled */
115    mgs_srvconf_rec *sc = (mgs_srvconf_rec *)
116        ap_get_module_config(c->base_server->module_config, &gnutls_module);
117    if (sc->proxy_enabled != GNUTLS_ENABLED_TRUE)
118    {
119        ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c,
120                      "%s: mod_proxy requested TLS proxy, but not enabled "
121                      "for %s", __func__, sc->cert_cn);
122        return 0;
123    }
124
125    /* enable TLS for this connection */
126    mgs_handle_t *ctxt = (mgs_handle_t *)
127        ap_get_module_config(c->conn_config, &gnutls_module);
128    if (ctxt == NULL)
129    {
130        ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c,
131                      "%s: allocating connection memory", __func__);
132        ctxt = apr_pcalloc(c->pool, sizeof (*ctxt));
133        ap_set_module_config(c->conn_config, &gnutls_module, ctxt);
134    }
135    ctxt->enabled = GNUTLS_ENABLED_TRUE;
136    return 1;
137}
138
139static const command_rec mgs_config_cmds[] = {
140    AP_INIT_TAKE1("SSLProxyEngine", mgs_set_proxy_engine,
141    NULL,
142    RSRC_CONF | OR_AUTHCFG,
143    "Enable SSL Proxy Engine"),
144    AP_INIT_TAKE1("GnuTLSClientVerify", mgs_set_client_verify,
145    NULL,
146    RSRC_CONF | OR_AUTHCFG,
147    "Set Verification Requirements of the Client Certificate"),
148    AP_INIT_TAKE1("GnuTLSClientVerifyMethod", mgs_set_client_verify_method,
149    NULL,
150    RSRC_CONF,
151    "Set Verification Method of the Client Certificate"),
152    AP_INIT_TAKE1("GnuTLSClientCAFile", mgs_set_client_ca_file,
153    NULL,
154    RSRC_CONF,
155    "Set the CA File to verify Client Certificates"),
156    AP_INIT_TAKE1("GnuTLSX509CAFile", mgs_set_client_ca_file,
157    NULL,
158    RSRC_CONF,
159    "Set the CA File to verify Client Certificates"),
160    AP_INIT_TAKE1("GnuTLSPGPKeyringFile", mgs_set_keyring_file,
161    NULL,
162    RSRC_CONF,
163    "Set the Keyring File to verify Client Certificates"),
164    AP_INIT_TAKE1("GnuTLSDHFile", mgs_set_dh_file,
165    NULL,
166    RSRC_CONF,
167    "Set the file to read Diffie Hellman parameters from"),
168    AP_INIT_TAKE1("GnuTLSCertificateFile", mgs_set_cert_file,
169    NULL,
170    RSRC_CONF,
171    "SSL Server X509 Certificate file"),
172    AP_INIT_TAKE1("GnuTLSKeyFile", mgs_set_key_file,
173    NULL,
174    RSRC_CONF,
175    "SSL Server X509 Private Key file"),
176    AP_INIT_TAKE1("GnuTLSX509CertificateFile", mgs_set_cert_file,
177    NULL,
178    RSRC_CONF,
179    "SSL Server X509 Certificate file"),
180    AP_INIT_TAKE1("GnuTLSX509KeyFile", mgs_set_key_file,
181    NULL,
182    RSRC_CONF,
183    "SSL Server X509 Private Key file"),
184    AP_INIT_TAKE1("GnuTLSPGPCertificateFile", mgs_set_pgpcert_file,
185    NULL,
186    RSRC_CONF,
187    "SSL Server PGP Certificate file"),
188    AP_INIT_TAKE1("GnuTLSPGPKeyFile", mgs_set_pgpkey_file,
189    NULL,
190    RSRC_CONF,
191    "SSL Server PGP Private key file"),
192#ifdef ENABLE_SRP
193    AP_INIT_TAKE1("GnuTLSSRPPasswdFile", mgs_set_srp_tpasswd_file,
194    NULL,
195    RSRC_CONF,
196    "SSL Server SRP Password Conf file"),
197    AP_INIT_TAKE1("GnuTLSSRPPasswdConfFile",
198    mgs_set_srp_tpasswd_conf_file,
199    NULL,
200    RSRC_CONF,
201    "SSL Server SRP Parameters file"),
202#endif
203    AP_INIT_TAKE1("GnuTLSCacheTimeout", mgs_set_cache_timeout,
204    NULL,
205    RSRC_CONF,
206    "Cache Timeout"),
207    AP_INIT_TAKE12("GnuTLSCache", mgs_set_cache,
208    NULL,
209    RSRC_CONF,
210    "Cache Configuration"),
211    AP_INIT_TAKE1("GnuTLSSessionTickets", mgs_set_tickets,
212    NULL,
213    RSRC_CONF,
214    "Session Tickets Configuration"),
215    AP_INIT_RAW_ARGS("GnuTLSPriorities", mgs_set_priorities,
216    NULL,
217    RSRC_CONF,
218    "The priorities to enable (ciphers, Key exchange, macs, compression)."),
219    AP_INIT_TAKE1("GnuTLSEnable", mgs_set_enabled,
220    NULL,
221    RSRC_CONF,
222    "Whether this server has GnuTLS Enabled. Default: Off"),
223    AP_INIT_TAKE1("GnuTLSExportCertificates",
224    mgs_set_export_certificates_size,
225    NULL,
226    RSRC_CONF,
227    "Max size to export PEM encoded certificates to CGIs (or off to disable). Default: off"),
228    { NULL },
229};
230
231module AP_MODULE_DECLARE_DATA gnutls_module = {
232    STANDARD20_MODULE_STUFF,
233    .create_dir_config = mgs_config_dir_create,
234    .merge_dir_config = mgs_config_dir_merge,
235    .create_server_config = mgs_config_server_create,
236    .merge_server_config = mgs_config_server_merge,
237    .cmds = mgs_config_cmds,
238    .register_hooks = gnutls_hooks
239};
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