source: mod_gnutls/src/mod_gnutls.c @ 265eafc

debian/masterdebian/stretch-backportsjessie-backportsupstream
Last change on this file since 265eafc was c1ef069, checked in by Thomas Klute <thomas2.klute@…>, 5 years ago

Record if a connection is a proxy connection

When handling a proxy request with TLS in the backend, the proxy server
acts as a TLS client. This requires a different setup of the GnuTLS
session, so we need to add a record to the connection configuration that
states whether it is a proxy backend connection or not.

  • Property mode set to 100644
File size: 8.0 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    ctxt->is_proxy = GNUTLS_ENABLED_TRUE;
104
105    if (c->input_filters)
106        ap_remove_input_filter(c->input_filters);
107    if (c->output_filters)
108        ap_remove_output_filter(c->output_filters);
109
110    return 1;
111}
112
113int ssl_proxy_enable(conn_rec *c)
114{
115    /* check if TLS proxy support is enabled */
116    mgs_srvconf_rec *sc = (mgs_srvconf_rec *)
117        ap_get_module_config(c->base_server->module_config, &gnutls_module);
118    if (sc->proxy_enabled != GNUTLS_ENABLED_TRUE)
119    {
120        ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c,
121                      "%s: mod_proxy requested TLS proxy, but not enabled "
122                      "for %s", __func__, sc->cert_cn);
123        return 0;
124    }
125
126    /* enable TLS for this connection */
127    mgs_handle_t *ctxt = (mgs_handle_t *)
128        ap_get_module_config(c->conn_config, &gnutls_module);
129    if (ctxt == NULL)
130    {
131        ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c,
132                      "%s: allocating connection memory", __func__);
133        ctxt = apr_pcalloc(c->pool, sizeof (*ctxt));
134        ap_set_module_config(c->conn_config, &gnutls_module, ctxt);
135    }
136    ctxt->enabled = GNUTLS_ENABLED_TRUE;
137    ctxt->is_proxy = GNUTLS_ENABLED_TRUE;
138    return 1;
139}
140
141static const command_rec mgs_config_cmds[] = {
142    AP_INIT_TAKE1("SSLProxyEngine", mgs_set_proxy_engine,
143    NULL,
144    RSRC_CONF | OR_AUTHCFG,
145    "Enable SSL Proxy Engine"),
146    AP_INIT_TAKE1("GnuTLSClientVerify", mgs_set_client_verify,
147    NULL,
148    RSRC_CONF | OR_AUTHCFG,
149    "Set Verification Requirements of the Client Certificate"),
150    AP_INIT_TAKE1("GnuTLSClientVerifyMethod", mgs_set_client_verify_method,
151    NULL,
152    RSRC_CONF,
153    "Set Verification Method of the Client Certificate"),
154    AP_INIT_TAKE1("GnuTLSClientCAFile", mgs_set_client_ca_file,
155    NULL,
156    RSRC_CONF,
157    "Set the CA File to verify Client Certificates"),
158    AP_INIT_TAKE1("GnuTLSX509CAFile", mgs_set_client_ca_file,
159    NULL,
160    RSRC_CONF,
161    "Set the CA File to verify Client Certificates"),
162    AP_INIT_TAKE1("GnuTLSPGPKeyringFile", mgs_set_keyring_file,
163    NULL,
164    RSRC_CONF,
165    "Set the Keyring File to verify Client Certificates"),
166    AP_INIT_TAKE1("GnuTLSDHFile", mgs_set_dh_file,
167    NULL,
168    RSRC_CONF,
169    "Set the file to read Diffie Hellman parameters from"),
170    AP_INIT_TAKE1("GnuTLSCertificateFile", mgs_set_cert_file,
171    NULL,
172    RSRC_CONF,
173    "SSL Server X509 Certificate file"),
174    AP_INIT_TAKE1("GnuTLSKeyFile", mgs_set_key_file,
175    NULL,
176    RSRC_CONF,
177    "SSL Server X509 Private Key file"),
178    AP_INIT_TAKE1("GnuTLSX509CertificateFile", mgs_set_cert_file,
179    NULL,
180    RSRC_CONF,
181    "SSL Server X509 Certificate file"),
182    AP_INIT_TAKE1("GnuTLSX509KeyFile", mgs_set_key_file,
183    NULL,
184    RSRC_CONF,
185    "SSL Server X509 Private Key file"),
186    AP_INIT_TAKE1("GnuTLSPGPCertificateFile", mgs_set_pgpcert_file,
187    NULL,
188    RSRC_CONF,
189    "SSL Server PGP Certificate file"),
190    AP_INIT_TAKE1("GnuTLSPGPKeyFile", mgs_set_pgpkey_file,
191    NULL,
192    RSRC_CONF,
193    "SSL Server PGP Private key file"),
194#ifdef ENABLE_SRP
195    AP_INIT_TAKE1("GnuTLSSRPPasswdFile", mgs_set_srp_tpasswd_file,
196    NULL,
197    RSRC_CONF,
198    "SSL Server SRP Password Conf file"),
199    AP_INIT_TAKE1("GnuTLSSRPPasswdConfFile",
200    mgs_set_srp_tpasswd_conf_file,
201    NULL,
202    RSRC_CONF,
203    "SSL Server SRP Parameters file"),
204#endif
205    AP_INIT_TAKE1("GnuTLSCacheTimeout", mgs_set_cache_timeout,
206    NULL,
207    RSRC_CONF,
208    "Cache Timeout"),
209    AP_INIT_TAKE12("GnuTLSCache", mgs_set_cache,
210    NULL,
211    RSRC_CONF,
212    "Cache Configuration"),
213    AP_INIT_TAKE1("GnuTLSSessionTickets", mgs_set_tickets,
214    NULL,
215    RSRC_CONF,
216    "Session Tickets Configuration"),
217    AP_INIT_RAW_ARGS("GnuTLSPriorities", mgs_set_priorities,
218    NULL,
219    RSRC_CONF,
220    "The priorities to enable (ciphers, Key exchange, macs, compression)."),
221    AP_INIT_TAKE1("GnuTLSEnable", mgs_set_enabled,
222    NULL,
223    RSRC_CONF,
224    "Whether this server has GnuTLS Enabled. Default: Off"),
225    AP_INIT_TAKE1("GnuTLSExportCertificates",
226    mgs_set_export_certificates_size,
227    NULL,
228    RSRC_CONF,
229    "Max size to export PEM encoded certificates to CGIs (or off to disable). Default: off"),
230    { NULL },
231};
232
233module AP_MODULE_DECLARE_DATA gnutls_module = {
234    STANDARD20_MODULE_STUFF,
235    .create_dir_config = mgs_config_dir_create,
236    .merge_dir_config = mgs_config_dir_merge,
237    .create_server_config = mgs_config_server_create,
238    .merge_server_config = mgs_config_server_merge,
239    .cmds = mgs_config_cmds,
240    .register_hooks = gnutls_hooks
241};
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