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gnutls_hooks.c @ 04753db8

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debian/masterproxy-ticket

Last change on this file since 04753db8 was 04753db8, checked in by Fiona Klute <fiona.klute@…>, 21 months ago

Require Host header to match SNI hostname (if any)

This is a conformance check on top of requiring virtual hosts of
connection and request to match.

Property mode set to 100644

File size: 80.1 KB

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1	/*
2	* Copyright 2004-2005 Paul Querna
3	* Copyright 2008, 2014 Nikos Mavrogiannopoulos
4	* Copyright 2011 Dash Shendy
5	* Copyright 2013-2014 Daniel Kahn Gillmor
6	* Copyright 2015-2018 Fiona Klute
7	*
8	* Licensed under the Apache License, Version 2.0 (the "License");
9	* you may not use this file except in compliance with the License.
10	* You may obtain a copy of the License at
11	*
12	* http://www.apache.org/licenses/LICENSE-2.0
13	*
14	* Unless required by applicable law or agreed to in writing, software
15	* distributed under the License is distributed on an "AS IS" BASIS,
16	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17	* See the License for the specific language governing permissions and
18	* limitations under the License.
19	*/
20
21	#include "mod_gnutls.h"
22	#include "gnutls_cache.h"
23	#include "gnutls_config.h"
24	#include "gnutls_ocsp.h"
25	#include "gnutls_util.h"
26	#include "gnutls_watchdog.h"
27
28	#include "http_vhost.h"
29	#include "ap_mpm.h"
30	#include "mod_status.h"
31	#include <util_mutex.h>
32	#include <apr_escape.h>
33
34	#ifdef ENABLE_MSVA
35	#include <msv/msv.h>
36	#endif
37
38	#ifdef APLOG_USE_MODULE
39	APLOG_USE_MODULE(gnutls);
40	#endif
41
42	#if MOD_GNUTLS_DEBUG
43	static apr_file_t *debug_log_fp;
44	#endif
45
46	#define IS_PROXY_STR(c) \
47	((c->is_proxy == GNUTLS_ENABLED_TRUE) ? "proxy " : "")
48
49	/** Key to encrypt session tickets. Must be kept secret. This key is
50	* generated in the `pre_config` hook and thus constant across
51	* forks. The problem with this approach is that it does not support
52	* regular key rotation. */
53	static gnutls_datum_t session_ticket_key = {NULL, 0};
54
55
56	/** Default GnuTLS priority string for mod_gnutls */
57	#define MGS_DEFAULT_PRIORITY "NORMAL"
58	/** Compiled version of MGS_DEFAULT_PRIORITY (initialized in the
59	* pre_config hook) */
60	static gnutls_priority_t default_prio;
61
62
63	static int mgs_cert_verify(request_rec * r, mgs_handle_t * ctxt);
64	/* use side==0 for server and side==1 for client */
65	static void mgs_add_common_cert_vars(request_rec * r, gnutls_x509_crt_t cert, int side, size_t export_cert_size);
66	static int mgs_status_hook(request_rec *r, int flags);
67	#ifdef ENABLE_MSVA
68	static const char* mgs_x509_construct_uid(request_rec * pool, gnutls_x509_crt_t cert);
69	#endif
70	static int load_proxy_x509_credentials(apr_pool_t pconf, apr_pool_t ptemp, server_rec *s)
71	__attribute__((nonnull));
72
73	/* Pool Cleanup Function */
74	apr_status_t mgs_cleanup_pre_config(void *data __attribute__((unused)))
75	{
76	/* Free session ticket master key */
77	#if GNUTLS_VERSION_NUMBER >= 0x030400
78	gnutls_memset(session_ticket_key.data, 0, session_ticket_key.size);
79	#endif
80	gnutls_free(session_ticket_key.data);
81	session_ticket_key.data = NULL;
82	session_ticket_key.size = 0;
83
84	/* Deinit default priority setting */
85	gnutls_priority_deinit(default_prio);
86	return APR_SUCCESS;
87	}
88
89	/* Logging Function for Maintainers */
90	#if MOD_GNUTLS_DEBUG
91	static void gnutls_debug_log_all(int level, const char *str) {
92	apr_file_printf(debug_log_fp, "<%d> %s", level, str);
93	}
94	#define _gnutls_log apr_file_printf
95	#else
96	#define _gnutls_log(...)
97	#endif
98
99	static const char* mgs_readable_cvm(mgs_client_verification_method_e m) {
100	switch(m) {
101	case mgs_cvm_unset:
102	return "unset";
103	case mgs_cvm_cartel:
104	return "cartel";
105	case mgs_cvm_msva:
106	return "msva";
107	}
108	return "unknown";
109	}
110
111	/* Pre-Configuration HOOK: Runs First */
112	int mgs_hook_pre_config(apr_pool_t * pconf, apr_pool_t * plog, apr_pool_t * ptemp __attribute__((unused))) {
113
114	/* Maintainer Logging */
115	#if MOD_GNUTLS_DEBUG
116	apr_file_open(&debug_log_fp, "/tmp/gnutls_debug", APR_APPEND \| APR_WRITE \| APR_CREATE, APR_OS_DEFAULT, pconf);
117	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
118	gnutls_global_set_log_level(9);
119	gnutls_global_set_log_function(gnutls_debug_log_all);
120	_gnutls_log(debug_log_fp, "gnutls: %s\n", gnutls_check_version(NULL));
121	#endif
122
123	int ret;
124
125	/* Check for required GnuTLS Library Version */
126	if (gnutls_check_version(LIBGNUTLS_VERSION) == NULL) {
127	ap_log_perror(APLOG_MARK, APLOG_EMERG, 0, plog, "gnutls_check_version() failed. Required: "
128	"gnutls-%s Found: gnutls-%s", LIBGNUTLS_VERSION, gnutls_check_version(NULL));
129	return DONE;
130	}
131
132	/* Generate a Session Key */
133	ret = gnutls_session_ticket_key_generate(&session_ticket_key);
134	if (ret < 0) {
135	ap_log_perror(APLOG_MARK, APLOG_EMERG, 0, plog, "gnutls_session_ticket_key_generate: %s", gnutls_strerror(ret));
136	return DONE;
137	}
138
139	/* Initialize default priority setting */
140	ret = gnutls_priority_init(&default_prio, MGS_DEFAULT_PRIORITY, NULL);
141	if (ret < 0)
142	{
143	ap_log_perror(APLOG_MARK, APLOG_EMERG, 0, plog,
144	"gnutls_priority_init failed for default '%s': %s (%d)",
145	MGS_DEFAULT_PRIORITY, gnutls_strerror(ret), ret);
146	return DONE;
147	}
148
149	AP_OPTIONAL_HOOK(status_hook, mgs_status_hook, NULL, NULL, APR_HOOK_MIDDLE);
150
151	ap_mutex_register(pconf, MGS_CACHE_MUTEX_NAME, NULL, APR_LOCK_DEFAULT, 0);
152	ap_mutex_register(pconf, MGS_OCSP_MUTEX_NAME, NULL, APR_LOCK_DEFAULT, 0);
153	ap_mutex_register(pconf, MGS_OCSP_CACHE_MUTEX_NAME, NULL,
154	APR_LOCK_DEFAULT, 0);
155
156	/* Register a pool clean-up function */
157	apr_pool_cleanup_register(pconf, NULL, mgs_cleanup_pre_config, apr_pool_cleanup_null);
158
159	return OK;
160	}
161
162
163
164	/**
165	* Get the list of available protocols for this connection and add it
166	* to the GnuTLS session. Must run before the client hello function.
167	*/
168	static void prepare_alpn_proposals(mgs_handle_t *ctxt)
169	{
170	/* Check if any protocol upgrades are available
171	*
172	* The "report_all" parameter to ap_get_protocol_upgrades() is 0
173	* (report only more preferable protocols) because setting it to 1
174	* doesn't actually report ALL protocols, but only all except the
175	* current one. This way we can at least list the current one as
176	* available by appending it without potentially negotiating a
177	* less preferred protocol. */
178	const apr_array_header_t *pupgrades = NULL;
179	apr_status_t ret =
180	ap_get_protocol_upgrades(ctxt->c, NULL, ctxt->c->base_server,
181	/report_all/ 0, &pupgrades);
182	if (ret != APR_SUCCESS)
183	{
184	ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, ctxt->c,
185	"%s: ap_get_protocol_upgrades() failed, "
186	"cannot configure ALPN!", __func__);
187	return;
188	}
189
190	if (pupgrades == NULL \|\| pupgrades->nelts == 0)
191	{
192	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, ctxt->c,
193	"%s: No protocol upgrades available.", __func__);
194	return;
195	}
196
197	ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, ctxt->c,
198	"%s: Found %d protocol upgrade(s) for ALPN: %s",
199	__func__, pupgrades->nelts,
200	apr_array_pstrcat(ctxt->c->pool, pupgrades, ','));
201	gnutls_datum_t *alpn_protos =
202	apr_palloc(ctxt->c->pool,
203	(pupgrades->nelts + 1) * sizeof(gnutls_datum_t));
204	for (int i = 0; i < pupgrades->nelts; i++)
205	{
206	alpn_protos[i].data = (void ) APR_ARRAY_IDX(pupgrades, i, char );
207	alpn_protos[i].size =
208	strnlen(APR_ARRAY_IDX(pupgrades, i, char *),
209	pupgrades->elt_size);
210	}
211
212	/* Add the current (default) protocol at the end of the list */
213	alpn_protos[pupgrades->nelts].data =
214	(void*) apr_pstrdup(ctxt->c->pool, ap_get_protocol(ctxt->c));
215	alpn_protos[pupgrades->nelts].size =
216	strlen((char*) alpn_protos[pupgrades->nelts].data);
217	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, ctxt->c,
218	"%s: Adding current protocol %s to ALPN set.",
219	__func__, alpn_protos[pupgrades->nelts].data);
220
221	gnutls_alpn_set_protocols(ctxt->session,
222	alpn_protos,
223	pupgrades->nelts,
224	GNUTLS_ALPN_SERVER_PRECEDENCE);
225	}
226
227
228
229	/**
230	* Check if ALPN selected any protocol upgrade, try to switch if so.
231	*/
232	static int process_alpn_result(mgs_handle_t *ctxt)
233	{
234	int ret = 0;
235	gnutls_datum_t alpn_proto;
236	ret = gnutls_alpn_get_selected_protocol(ctxt->session, &alpn_proto);
237	if (ret != GNUTLS_E_SUCCESS)
238	{
239	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, APR_SUCCESS, ctxt->c,
240	"%s: No ALPN result: %s (%d)",
241	__func__, gnutls_strerror(ret), ret);
242	return GNUTLS_E_SUCCESS;
243	}
244
245	apr_array_header_t *client_protos =
246	apr_array_make(ctxt->c->pool, 1, sizeof(char *));
247	/* apr_pstrndup to ensure that the protocol is null terminated */
248	APR_ARRAY_PUSH(client_protos, char *) =
249	apr_pstrndup(ctxt->c->pool, (char*) alpn_proto.data, alpn_proto.size);
250	const char *selected =
251	ap_select_protocol(ctxt->c, NULL, ctxt->c->base_server,
252	client_protos);
253
254	/* ap_select_protocol() will return NULL if none of the ALPN
255	* proposals matched. GnuTLS negotiated alpn_proto based on the
256	* list provided by the server, but the vhost might have changed
257	* based on SNI. Apache seems to adjust the proposal list to avoid
258	* such issues though.
259	*
260	* GnuTLS will return a fatal "no_application_protocol" alert as
261	* required by RFC 7301 if the post client hello function returns
262	* GNUTLS_E_NO_APPLICATION_PROTOCOL. */
263	if (!selected)
264	{
265	ap_log_cerror(APLOG_MARK, APLOG_ERR, APR_EGENERAL, ctxt->c,
266	"%s: ap_select_protocol() returned NULL! Please "
267	"make sure any overlapping vhosts have the same "
268	"protocols available.",
269	__func__);
270	return GNUTLS_E_NO_APPLICATION_PROTOCOL;
271	}
272
273	if (strcmp(selected, ap_get_protocol(ctxt->c)) == 0)
274	{
275	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, APR_SUCCESS, ctxt->c,
276	"%s: Already using protocol '%s', nothing to do.",
277	__func__, selected);
278	return GNUTLS_E_SUCCESS;
279	}
280
281	ap_log_cerror(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, ctxt->c,
282	"%s: Switching protocol to '%s' based on ALPN.",
283	__func__, selected);
284	apr_status_t status = ap_switch_protocol(ctxt->c, NULL,
285	ctxt->c->base_server,
286	selected);
287	if (status != APR_SUCCESS)
288	{
289	ap_log_cerror(APLOG_MARK, APLOG_ERR, status, ctxt->c,
290	"%s: Protocol switch to '%s' failed!",
291	__func__, selected);
292	return GNUTLS_E_NO_APPLICATION_PROTOCOL;
293	}
294	/* ALPN done! */
295	return GNUTLS_E_SUCCESS;
296	}
297
298
299
300	/**
301	* Post client hello function for GnuTLS, used to configure the TLS
302	* server based on virtual host configuration. Uses SNI to select the
303	* virtual host if available.
304	*
305	* @param session the TLS session
306	*
307	* @return zero or a GnuTLS error code, as required by GnuTLS hook
308	* definition
309	*/
310	static int mgs_select_virtual_server_cb(gnutls_session_t session)
311	{
312	int ret = 0;
313	mgs_handle_t *ctxt = gnutls_session_get_ptr(session);
314
315	/* try to find a virtual host */
316	mgs_srvconf_rec *tsc = mgs_find_sni_server(session);
317	if (tsc != NULL)
318	{
319	/* Found a TLS vhost based on the SNI, configure the
320	* connection context. */
321	ctxt->sc = tsc;
322	}
323
324	gnutls_certificate_server_set_request(session, ctxt->sc->client_verify_mode);
325
326	/* Set x509 credentials */
327	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, ctxt->sc->certs);
328	/* Set Anon credentials */
329	gnutls_credentials_set(session, GNUTLS_CRD_ANON, ctxt->sc->anon_creds);
330
331	#ifdef ENABLE_SRP
332	/* Set SRP credentials */
333	if (ctxt->sc->srp_tpasswd_conf_file != NULL && ctxt->sc->srp_tpasswd_file != NULL) {
334	gnutls_credentials_set(session, GNUTLS_CRD_SRP, ctxt->sc->srp_creds);
335	}
336	#endif
337
338	/* Enable session tickets */
339	if (session_ticket_key.data != NULL &&
340	ctxt->sc->tickets == GNUTLS_ENABLED_TRUE)
341	{
342	ret = gnutls_session_ticket_enable_server(ctxt->session, &session_ticket_key);
343	if (ret != GNUTLS_E_SUCCESS)
344	ap_log_cerror(APLOG_MARK, APLOG_ERR, APR_EGENERAL, ctxt->c,
345	"gnutls_session_ticket_enable_server failed: %s (%d)",
346	gnutls_strerror(ret), ret);
347	}
348
349	ret = process_alpn_result(ctxt);
350	if (ret != GNUTLS_E_SUCCESS)
351	return ret;
352
353	/* Update the priorities - to avoid negotiating a ciphersuite that is not
354	* enabled on this virtual server. Note that here we ignore the version
355	* negotiation. */
356	ret = gnutls_priority_set(session, ctxt->sc->priorities);
357
358	/* actually it shouldn't fail since we have checked at startup */
359	return ret;
360	}
361
362	static int cert_retrieve_fn(gnutls_session_t session,
363	const gnutls_datum_t * req_ca_rdn __attribute__((unused)),
364	int nreqs __attribute__((unused)),
365	const gnutls_pk_algorithm_t * pk_algos __attribute__((unused)),
366	int pk_algos_length __attribute__((unused)),
367	gnutls_pcert_st **pcerts,
368	unsigned int *pcert_length,
369	gnutls_privkey_t *privkey)
370	{
371	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
372
373	mgs_handle_t *ctxt;
374
375	if (session == NULL) {
376	// ERROR INVALID SESSION
377	return -1;
378	}
379
380	ctxt = gnutls_transport_get_ptr(session);
381
382	if (gnutls_certificate_type_get(session) == GNUTLS_CRT_X509) {
383	// X509 CERTIFICATE
384	*pcerts = ctxt->sc->certs_x509_chain;
385	*pcert_length = ctxt->sc->certs_x509_chain_num;
386	*privkey = ctxt->sc->privkey_x509;
387	return 0;
388	} else {
389	// UNKNOWN CERTIFICATE
390	return -1;
391	}
392	}
393
394
395
396	#if GNUTLS_VERSION_NUMBER >= 0x030506
397	#define HAVE_KNOWN_DH_GROUPS 1
398	#endif
399	#ifdef HAVE_KNOWN_DH_GROUPS
400	/**
401	* Try to estimate a GnuTLS security parameter based on the given
402	* private key. Any errors are logged.
403	*
404	* @param s The `server_rec` to use for logging
405	*
406	* @param key The private key to use
407	*
408	* @return `gnutls_sec_param_t` as returned by
409	* `gnutls_pk_bits_to_sec_param` for the key properties, or
410	* GNUTLS_SEC_PARAM_UNKNOWN in case of error
411	*/
412	static gnutls_sec_param_t sec_param_from_privkey(server_rec *server,
413	gnutls_privkey_t key)
414	{
415	unsigned int bits = 0;
416	int pk_algo = gnutls_privkey_get_pk_algorithm(key, &bits);
417	if (pk_algo < 0)
418	{
419	ap_log_error(APLOG_MARK, APLOG_ERR, APR_EGENERAL, server,
420	"%s: Could not get private key parameters: %s (%d)",
421	__func__, gnutls_strerror(pk_algo), pk_algo);
422	return GNUTLS_SEC_PARAM_UNKNOWN;
423	}
424	return gnutls_pk_bits_to_sec_param(pk_algo, bits);
425	}
426	#else
427	/** ffdhe2048 DH group as defined in RFC 7919, Appendix A.1. This is
428	* the default DH group if mod_gnutls is compiled agains a GnuTLS
429	* version that does not provide known DH groups based on security
430	* parameters (before 3.5.6). */
431	static const char FFDHE2048_PKCS3[] =
432	"-----BEGIN DH PARAMETERS-----\n"
433	"MIIBDAKCAQEA//////////+t+FRYortKmq/cViAnPTzx2LnFg84tNpWp4TZBFGQz\n"
434	"+8yTnc4kmz75fS/jY2MMddj2gbICrsRhetPfHtXV/WVhJDP1H18GbtCFY2VVPe0a\n"
435	"87VXE15/V8k1mE8McODmi3fipona8+/och3xWKE2rec1MKzKT0g6eXq8CrGCsyT7\n"
436	"YdEIqUuyyOP7uWrat2DX9GgdT0Kj3jlN9K5W7edjcrsZCwenyO4KbXCeAvzhzffi\n"
437	"7MA0BM0oNC9hkXL+nOmFg/+OTxIy7vKBg8P+OxtMb61zO7X8vC7CIAXFjvGDfRaD\n"
438	"ssbzSibBsu/6iGtCOGEoXJf//////////wIBAgICAQA=\n"
439	"-----END DH PARAMETERS-----\n";
440	const gnutls_datum_t default_dh_params = {
441	(void *) FFDHE2048_PKCS3,
442	sizeof(FFDHE2048_PKCS3)
443	};
444	#endif
445
446
447
448	/**
449	* Configure the default DH groups to use for the given server. When
450	* compiled against GnuTLS version 3.5.6 or newer the known DH group
451	* matching the GnuTLS security parameter estimated from the private
452	* key is used. Otherwise the ffdhe2048 DH group as defined in RFC
453	* 7919, Appendix A.1 is the default.
454	*
455	* @param server the host to configure
456	*
457	* @return `OK` on success, `HTTP_UNAUTHORIZED` otherwise
458	*/
459	static int set_default_dh_param(server_rec *server)
460	{
461	mgs_srvconf_rec sc = (mgs_srvconf_rec )
462	ap_get_module_config(server->module_config, &gnutls_module);
463
464	#ifdef HAVE_KNOWN_DH_GROUPS
465	gnutls_sec_param_t seclevel = GNUTLS_SEC_PARAM_UNKNOWN;
466	if (sc->privkey_x509)
467	{
468	seclevel = sec_param_from_privkey(server, sc->privkey_x509);
469	ap_log_error(APLOG_MARK, APLOG_TRACE1, APR_SUCCESS, server,
470	"%s: GnuTLS security param estimated based on "
471	"private key '%s': %s",
472	__func__, sc->x509_key_file,
473	gnutls_sec_param_get_name(seclevel));
474	}
475
476	if (seclevel == GNUTLS_SEC_PARAM_UNKNOWN)
477	seclevel = GNUTLS_SEC_PARAM_MEDIUM;
478	ap_log_error(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, server,
479	"%s: Setting DH params for security level '%s'.",
480	__func__, gnutls_sec_param_get_name(seclevel));
481
482	int ret = gnutls_certificate_set_known_dh_params(sc->certs, seclevel);
483	if (ret < 0)
484	{
485	ap_log_error(APLOG_MARK, APLOG_EMERG, APR_EGENERAL, server,
486	"%s: setting known DH params failed: %s (%d)",
487	__func__, gnutls_strerror(ret), ret);
488	return HTTP_UNAUTHORIZED;
489	}
490	ret = gnutls_anon_set_server_known_dh_params(sc->anon_creds, seclevel);
491	if (ret < 0)
492	{
493	ap_log_error(APLOG_MARK, APLOG_EMERG, APR_EGENERAL, server,
494	"%s: setting known DH params failed: %s (%d)",
495	__func__, gnutls_strerror(ret), ret);
496	return HTTP_UNAUTHORIZED;
497	}
498	#else
499	int ret = gnutls_dh_params_init(&sc->dh_params);
500	if (ret < 0)
501	{
502	ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, server,
503	"%s: Failed to initialize DH params structure: "
504	"%s (%d)", __func__, gnutls_strerror(ret), ret);
505	return HTTP_UNAUTHORIZED;
506	}
507	ret = gnutls_dh_params_import_pkcs3(sc->dh_params, &default_dh_params,
508	GNUTLS_X509_FMT_PEM);
509	if (ret < 0)
510	{
511	ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, server,
512	"%s: Failed to import default DH params: %s (%d)",
513	__func__, gnutls_strerror(ret), ret);
514	return HTTP_UNAUTHORIZED;
515	}
516
517	gnutls_certificate_set_dh_params(sc->certs, sc->dh_params);
518	gnutls_anon_set_server_dh_params(sc->anon_creds, sc->dh_params);
519	#endif
520
521	return OK;
522	}
523
524
525
526	/**
527	* Post config hook.
528	*
529	* Must return OK or DECLINED on success, something else on
530	* error. These codes are defined in Apache httpd.h along with the
531	* HTTP status codes, so I'm going to use HTTP error codes both for
532	* fun (and to avoid conflicts).
533	*/
534	int mgs_hook_post_config(apr_pool_t *pconf,
535	apr_pool_t *plog __attribute__((unused)),
536	apr_pool_t *ptemp,
537	server_rec *base_server)
538	{
539	int rv;
540	server_rec *s;
541	mgs_srvconf_rec *sc;
542	mgs_srvconf_rec *sc_base;
543	void *data = NULL;
544	const char *userdata_key = "mgs_init";
545
546	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
547
548	apr_pool_userdata_get(&data, userdata_key, base_server->process->pool);
549	if (data == NULL) {
550	apr_pool_userdata_set((const void *) 1, userdata_key, apr_pool_cleanup_null, base_server->process->pool);
551	}
552
553	s = base_server;
554	sc_base = (mgs_srvconf_rec *) ap_get_module_config(s->module_config, &gnutls_module);
555
556
557	rv = mgs_cache_post_config(pconf, ptemp, s, sc_base);
558	if (rv != APR_SUCCESS)
559	{
560	ap_log_error(APLOG_MARK, APLOG_STARTUP, rv, s,
561	"Post config for cache failed.");
562	return HTTP_INSUFFICIENT_STORAGE;
563	}
564
565	if (sc_base->ocsp_mutex == NULL)
566	{
567	rv = ap_global_mutex_create(&sc_base->ocsp_mutex, NULL,
568	MGS_OCSP_MUTEX_NAME, NULL,
569	base_server, pconf, 0);
570	if (rv != APR_SUCCESS)
571	return rv;
572	}
573
574	/* If GnuTLSP11Module is set, load the listed PKCS #11
575	* modules. Otherwise system defaults will be used. */
576	if (sc_base->p11_modules != NULL)
577	{
578	rv = gnutls_pkcs11_init(GNUTLS_PKCS11_FLAG_MANUAL, NULL);
579	if (rv < 0)
580	{
581	ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, s,
582	"GnuTLS: Initializing PKCS #11 "
583	"failed: %s (%d).",
584	gnutls_strerror(rv), rv);
585	}
586	else
587	{
588	for (int i = 0; i < sc_base->p11_modules->nelts; i++)
589	{
590	char *p11_module =
591	APR_ARRAY_IDX(sc_base->p11_modules, i, char *);
592	rv = gnutls_pkcs11_add_provider(p11_module, NULL);
593	if (rv != GNUTLS_E_SUCCESS)
594	ap_log_error(APLOG_MARK, APLOG_STARTUP, APR_EGENERAL, s,
595	"GnuTLS: Loading PKCS #11 provider module %s "
596	"failed: %s (%d).",
597	p11_module, gnutls_strerror(rv), rv);
598	else
599	ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s,
600	"%s: PKCS #11 provider module %s loaded.",
601	__func__, p11_module);
602	}
603	}
604	}
605
606	sc_base->singleton_wd =
607	mgs_new_singleton_watchdog(base_server, MGS_SINGLETON_WATCHDOG, pconf);
608
609	for (s = base_server; s; s = s->next)
610	{
611	sc = (mgs_srvconf_rec *) ap_get_module_config(s->module_config, &gnutls_module);
612	sc->cache_enable = sc_base->cache_enable;
613	sc->cache = sc_base->cache;
614	if (sc->cache_timeout == MGS_TIMEOUT_UNSET)
615	sc->cache_timeout = sc_base->cache_timeout;
616	sc->ocsp_cache = sc_base->ocsp_cache;
617
618	sc->singleton_wd = sc_base->singleton_wd;
619
620	/* defaults for unset values: */
621	if (sc->enabled == GNUTLS_ENABLED_UNSET)
622	sc->enabled = GNUTLS_ENABLED_FALSE;
623	if (sc->tickets == GNUTLS_ENABLED_UNSET)
624	{
625	/* GnuTLS 3.6.4 introduced automatic master key rotation */
626	if (gnutls_check_version_numeric(3, 6, 4))
627	sc->tickets = GNUTLS_ENABLED_TRUE;
628	else
629	sc->tickets = GNUTLS_ENABLED_FALSE;
630	}
631	if (sc->export_certificates_size < 0)
632	sc->export_certificates_size = 0;
633	if (sc->client_verify_mode == -1)
634	sc->client_verify_mode = GNUTLS_CERT_IGNORE;
635	if (sc->client_verify_method == mgs_cvm_unset)
636	sc->client_verify_method = mgs_cvm_cartel;
637
638	// TODO: None of the stuff below needs to be done if
639	// sc->enabled == GNUTLS_ENABLED_FALSE, we could just continue
640	// to the next host.
641
642	/* Load certificates and stuff (includes parsing priority) */
643	rv = mgs_load_files(pconf, ptemp, s);
644	if (rv != 0) {
645	ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, s,
646	"%s: Loading credentials failed!", __func__);
647	return HTTP_NOT_FOUND;
648	}
649
650	sc->ocsp_mutex = sc_base->ocsp_mutex;
651	/* init OCSP configuration unless explicitly disabled */
652	if (sc->enabled && sc->ocsp_staple != GNUTLS_ENABLED_FALSE)
653	{
654	const char *err = mgs_ocsp_configure_stapling(pconf, ptemp, s);
655	if (err != NULL)
656	{
657	/* If OCSP stapling is enabled only by default ignore
658	* error and disable stapling */
659	if (sc->ocsp_staple == GNUTLS_ENABLED_UNSET)
660	{
661	ap_log_error(APLOG_MARK, APLOG_INFO, APR_SUCCESS, s,
662	"Cannnot enable OCSP stapling for "
663	"host '%s:%d': %s",
664	s->server_hostname, s->addrs->host_port, err);
665	sc->ocsp_staple = GNUTLS_ENABLED_FALSE;
666	}
667	/* If OCSP stapling is explicitly enabled this is a
668	* critical error. */
669	else
670	{
671	ap_log_error(APLOG_MARK, APLOG_STARTUP, APR_EINVAL, s,
672	"OCSP stapling configuration failed for "
673	"host '%s:%d': %s",
674	s->server_hostname, s->addrs->host_port, err);
675	return HTTP_INTERNAL_SERVER_ERROR;
676	}
677	}
678	else
679	{
680	/* Might already be set */
681	sc->ocsp_staple = GNUTLS_ENABLED_TRUE;
682	/* Set up stapling */
683	rv = mgs_ocsp_enable_stapling(pconf, ptemp, s);
684	if (rv != OK && rv != DECLINED)
685	return rv;
686	}
687	}
688
689	/* Check if the priorities have been set */
690	if (sc->priorities == NULL && sc->enabled == GNUTLS_ENABLED_TRUE) {
691	ap_log_error(APLOG_MARK, APLOG_INFO, 0, s,
692	"No GnuTLSPriorities directive for host '%s:%d', "
693	"using default '%s'.",
694	s->server_hostname, s->addrs->host_port,
695	MGS_DEFAULT_PRIORITY);
696	sc->priorities = default_prio;
697	}
698
699	/* Set host DH params from user configuration or defaults */
700	if (sc->dh_params != NULL) {
701	gnutls_certificate_set_dh_params(sc->certs, sc->dh_params);
702	gnutls_anon_set_server_dh_params(sc->anon_creds, sc->dh_params);
703	} else {
704	rv = set_default_dh_param(s);
705	if (rv != OK)
706	return rv;
707	}
708
709	/* The call after this comment is a workaround for bug in
710	* gnutls_certificate_set_retrieve_function2 that ignores
711	* supported certificate types. Should be fixed in GnuTLS
712	* 3.3.12.
713	*
714	* Details:
715	* https://lists.gnupg.org/pipermail/gnutls-devel/2015-January/007377.html
716	* Workaround from:
717	* https://github.com/vanrein/tlspool/commit/4938102d3d1b086491d147e6c8e4e2a02825fc12 */
718	#if GNUTLS_VERSION_NUMBER < 0x030312
719	gnutls_certificate_set_retrieve_function(sc->certs, (void *) exit);
720	#endif
721
722	gnutls_certificate_set_retrieve_function2(sc->certs, cert_retrieve_fn);
723
724	if ((sc->certs_x509_chain == NULL \|\| sc->certs_x509_chain_num < 1) &&
725	sc->enabled == GNUTLS_ENABLED_TRUE) {
726	ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, s,
727	"GnuTLS: Host '%s:%d' is missing a Certificate File!",
728	s->server_hostname, s->addrs->host_port);
729	return HTTP_UNAUTHORIZED;
730	}
731	if (sc->enabled == GNUTLS_ENABLED_TRUE &&
732	(sc->certs_x509_chain_num > 0 && sc->privkey_x509 == NULL))
733	{
734	ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, s,
735	"GnuTLS: Host '%s:%d' is missing a Private Key File!",
736	s->server_hostname, s->addrs->host_port);
737	return HTTP_UNAUTHORIZED;
738	}
739
740	if (sc->enabled == GNUTLS_ENABLED_TRUE
741	&& sc->proxy_enabled == GNUTLS_ENABLED_TRUE
742	&& load_proxy_x509_credentials(pconf, ptemp, s) != APR_SUCCESS)
743	{
744	ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, s,
745	"%s: loading proxy credentials for host "
746	"'%s:%d' failed, exiting!",
747	__func__, s->server_hostname, s->addrs->host_port);
748	return HTTP_PROXY_AUTHENTICATION_REQUIRED;
749	}
750	}
751
752
753	ap_add_version_component(pconf, "mod_gnutls/" MOD_GNUTLS_VERSION);
754
755	{
756	const char* libvers = gnutls_check_version(NULL);
757	char* gnutls_version = NULL;
758	if(libvers && (gnutls_version = apr_psprintf(pconf, "GnuTLS/%s", libvers))) {
759	ap_add_version_component(pconf, gnutls_version);
760	} else {
761	// In case we could not create the above string go for the static version instead
762	ap_add_version_component(pconf, "GnuTLS/" GNUTLS_VERSION "-static");
763	}
764	}
765
766	return OK;
767	}
768
769	void mgs_hook_child_init(apr_pool_t p, server_rec s)
770	{
771	apr_status_t rv = APR_SUCCESS;
772	mgs_srvconf_rec sc = (mgs_srvconf_rec )
773	ap_get_module_config(s->module_config, &gnutls_module);
774
775	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
776
777	/* if we use PKCS #11 reinitialize it */
778	if (mgs_pkcs11_reinit(s) < 0) {
779	ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s,
780	"GnuTLS: Failed to reinitialize PKCS #11");
781	exit(-1);
782	}
783
784	if (sc->cache_enable == GNUTLS_ENABLED_TRUE)
785	{
786	rv = mgs_cache_child_init(p, s, sc->cache, MGS_CACHE_MUTEX_NAME);
787	if (rv != APR_SUCCESS)
788	ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
789	"Child init for session cache failed!");
790	}
791
792	if (sc->ocsp_cache != NULL)
793	{
794	rv = mgs_cache_child_init(p, s, sc->ocsp_cache,
795	MGS_OCSP_CACHE_MUTEX_NAME);
796	if (rv != APR_SUCCESS)
797	ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
798	"Child init for OCSP cache failed!");
799	}
800
801	/* reinit OCSP request mutex */
802	const char *lockfile = apr_global_mutex_lockfile(sc->ocsp_mutex);
803	rv = apr_global_mutex_child_init(&sc->ocsp_mutex, lockfile, p);
804	if (rv != APR_SUCCESS)
805	ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
806	"Failed to reinit mutex '" MGS_OCSP_MUTEX_NAME "'.");
807
808	/* Block SIGPIPE Signals */
809	rv = apr_signal_block(SIGPIPE);
810	if(rv != APR_SUCCESS) {
811	/* error sending output */
812	ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
813	"GnuTLS: Error Blocking SIGPIPE Signal!");
814	}
815	}
816
817	const char mgs_hook_http_scheme(const request_rec r) {
818	mgs_srvconf_rec *sc;
819
820	if (r == NULL)
821	return NULL;
822
823	sc = (mgs_srvconf_rec *) ap_get_module_config(r->
824	server->module_config,
825	&gnutls_module);
826
827	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
828	if (sc->enabled == GNUTLS_ENABLED_FALSE) {
829	return NULL;
830	}
831
832	return "https";
833	}
834
835	apr_port_t mgs_hook_default_port(const request_rec * r) {
836	mgs_srvconf_rec *sc;
837
838	if (r == NULL)
839	return 0;
840
841	sc = (mgs_srvconf_rec *) ap_get_module_config(r->
842	server->module_config,
843	&gnutls_module);
844
845	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
846	if (sc->enabled == GNUTLS_ENABLED_FALSE) {
847	return 0;
848	}
849
850	return 443;
851	}
852
853	/**
854	* Default buffer size for SNI data, including the terminating NULL
855	* byte. The size matches what gnutls-cli uses initially.
856	*/
857	#define DEFAULT_SNI_HOST_LEN 256
858
859	typedef struct {
860	mgs_handle_t *ctxt;
861	mgs_srvconf_rec *sc;
862	const char *sni_name;
863	} vhost_cb_rec;
864
865	/**
866	* Matches the current vhost's ServerAlias directives
867	*
868	* @param x vhost callback record
869	* @param s server record
870	* @param tsc mod_gnutls server data for `s`
871	*
872	* @return true if a match, false otherwise
873	*
874	*/
875	int check_server_aliases(vhost_cb_rec x, server_rec s, mgs_srvconf_rec *tsc)
876	{
877	apr_array_header_t *names;
878	int rv = 0;
879	char ** name;
880
881	/* Check ServerName First! */
882	if(apr_strnatcasecmp(x->sni_name, s->server_hostname) == 0) {
883	// We have a match, save this server configuration
884	x->sc = tsc;
885	rv = 1;
886	/* Check any ServerAlias directives */
887	} else if(s->names->nelts) {
888	names = s->names;
889	name = (char **)names->elts;
890	for (int i = 0; i < names->nelts; ++i)
891	{
892	if (!name[i]) { continue; }
893	if (apr_strnatcasecmp(x->sni_name, name[i]) == 0) {
894	// We have a match, save this server configuration
895	x->sc = tsc;
896	rv = 1;
897	}
898	}
899	/* Wild any ServerAlias Directives */
900	} else if(s->wild_names->nelts) {
901	names = s->wild_names;
902	name = (char **)names->elts;
903	for (int i = 0; i < names->nelts; ++i)
904	{
905	if (!name[i]) { continue; }
906	if(apr_fnmatch(name[i], x->sni_name ,
907	APR_FNM_CASE_BLIND\|
908	APR_FNM_PERIOD\|
909	APR_FNM_PATHNAME\|
910	APR_FNM_NOESCAPE) == APR_SUCCESS) {
911	x->sc = tsc;
912	rv = 1;
913	}
914	}
915	}
916	return rv;
917	}
918
919	static int vhost_cb(void baton, conn_rec conn, server_rec * s)
920	{
921	mgs_srvconf_rec *tsc;
922	vhost_cb_rec *x = baton;
923	int ret;
924
925	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
926	tsc = (mgs_srvconf_rec *) ap_get_module_config(s->module_config,
927	&gnutls_module);
928
929	if (tsc->enabled != GNUTLS_ENABLED_TRUE) {
930	return 0;
931	}
932
933	if (tsc->certs_x509_chain_num > 0) {
934	/* this check is there to warn administrator of any missing hostname
935	* in the certificate. */
936	ret = gnutls_x509_crt_check_hostname(tsc->certs_x509_crt_chain[0], s->server_hostname);
937	if (0 == ret)
938	ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, conn,
939	"GnuTLS: the certificate doesn't match requested "
940	"hostname '%s'", s->server_hostname);
941	} else {
942	ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, conn,
943	"GnuTLS: SNI request for '%s' but no X.509 certs "
944	"available at all",
945	s->server_hostname);
946	}
947	return check_server_aliases(x, s, tsc);
948	}
949
950	/**
951	* Get SNI data from GnuTLS (if any) and search for a matching virtual
952	* host configuration. This method is called from the post client
953	* hello function.
954	*
955	* @param session the GnuTLS session
956	*
957	* @return either the matching mod_gnutls server config, or `NULL`
958	*/
959	mgs_srvconf_rec *mgs_find_sni_server(gnutls_session_t session)
960	{
961	mgs_handle_t *ctxt = gnutls_session_get_ptr(session);
962
963	char *sni_name = apr_palloc(ctxt->c->pool, DEFAULT_SNI_HOST_LEN);
964	size_t sni_len = DEFAULT_SNI_HOST_LEN;
965	unsigned int sni_type;
966
967	/* Search for a DNS SNI element. Note that RFC 6066 prohibits more
968	* than one server name per type. */
969	int sni_index = -1;
970	int rv = 0;
971	do {
972	/* The sni_index is incremented before each use, so if the
973	* loop terminates with a type match we will have the right
974	* one stored. */
975	rv = gnutls_server_name_get(session, sni_name,
976	&sni_len, &sni_type, ++sni_index);
977	if (rv == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
978	{
979	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, APR_EGENERAL, ctxt->c,
980	"%s: no DNS SNI found (last index: %d).",
981	__func__, sni_index);
982	return NULL;
983	}
984	} while (sni_type != GNUTLS_NAME_DNS);
985	/* The (rv == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) path inside
986	* the loop above returns, so if we reach this point we have a DNS
987	* SNI at the current index. */
988
989	if (rv == GNUTLS_E_SHORT_MEMORY_BUFFER)
990	{
991	/* Allocate a new buffer of the right size and retry */
992	sni_name = apr_palloc(ctxt->c->pool, sni_len);
993	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, APR_SUCCESS, ctxt->c,
994	"%s: reallocated SNI data buffer for %" APR_SIZE_T_FMT
995	" bytes.", __func__, sni_len);
996	rv = gnutls_server_name_get(session, sni_name,
997	&sni_len, &sni_type, sni_index);
998	}
999
1000	/* Unless there's a bug in the GnuTLS API only GNUTLS_E_IDNA_ERROR
1001	* can occur here, but a catch all is safer and no more
1002	* complicated. */
1003	if (rv != GNUTLS_E_SUCCESS)
1004	{
1005	ap_log_cerror(APLOG_MARK, APLOG_INFO, APR_EGENERAL, ctxt->c,
1006	"%s: error while getting SNI DNS data: '%s' (%d).",
1007	__func__, gnutls_strerror(rv), rv);
1008	return NULL;
1009	}
1010
1011	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, APR_SUCCESS, ctxt->c,
1012	"%s: client requested server '%s'.",
1013	__func__, sni_name);
1014	ctxt->sni_name = sni_name;
1015
1016	/* Search for vhosts matching connection parameters and the
1017	* SNI. If a match is found, cbx.sc will contain the mod_gnutls
1018	* server config for the vhost. */
1019	vhost_cb_rec cbx = {
1020	.ctxt = ctxt,
1021	.sc = NULL,
1022	.sni_name = sni_name
1023	};
1024	rv = ap_vhost_iterate_given_conn(ctxt->c, vhost_cb, &cbx);
1025	if (rv == 1) {
1026	return cbx.sc;
1027	}
1028	return NULL;
1029	}
1030
1031	/**
1032	* This function is intended as a cleanup handler for connections
1033	* using GnuTLS. If attached to the connection pool, it ensures that
1034	* session resources are released with the connection pool even if the
1035	* session wasn't terminated properly.
1036	*
1037	* @param data must point to the mgs_handle_t associated with the
1038	* connection
1039	*/
1040	static apr_status_t cleanup_gnutls_session(void *data)
1041	{
1042	/* nothing to do */
1043	if (data == NULL)
1044	return APR_SUCCESS;
1045
1046	/* check if session needs closing */
1047	mgs_handle_t ctxt = (mgs_handle_t ) data;
1048	if (ctxt->session != NULL)
1049	{
1050	ap_log_cerror(APLOG_MARK, APLOG_WARNING, APR_ECONNABORTED, ctxt->c,
1051	"%s: connection pool cleanup in progress but %sTLS "
1052	"session hasn't been terminated, trying to close",
1053	__func__, IS_PROXY_STR(ctxt));
1054	int ret;
1055	/* Try A Clean Shutdown */
1056	do
1057	ret = gnutls_bye(ctxt->session, GNUTLS_SHUT_WR);
1058	while (ret == GNUTLS_E_INTERRUPTED \|\| ret == GNUTLS_E_AGAIN);
1059	if (ret != GNUTLS_E_SUCCESS)
1060	ap_log_cerror(APLOG_MARK, APLOG_INFO, APR_EGENERAL, ctxt->c,
1061	"%s: error while closing TLS %sconnection: %s (%d)",
1062	__func__, IS_PROXY_STR(ctxt),
1063	gnutls_strerror(ret), ret);
1064	else
1065	ap_log_cerror(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, ctxt->c,
1066	"%s: TLS %sconnection closed.",
1067	__func__, IS_PROXY_STR(ctxt));
1068	/* De-Initialize Session */
1069	gnutls_deinit(ctxt->session);
1070	ctxt->session = NULL;
1071	}
1072	return APR_SUCCESS;
1073	}
1074
1075	static void create_gnutls_handle(conn_rec * c)
1076	{
1077	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
1078
1079	/* Get connection specific configuration */
1080	mgs_handle_t *ctxt = init_gnutls_ctxt(c);
1081	ctxt->enabled = GNUTLS_ENABLED_TRUE;
1082	ctxt->status = 0;
1083	ctxt->input_rc = APR_SUCCESS;
1084	ctxt->input_bb = apr_brigade_create(c->pool, c->bucket_alloc);
1085	ctxt->input_cbuf.length = 0;
1086	ctxt->output_rc = APR_SUCCESS;
1087	ctxt->output_bb = apr_brigade_create(c->pool, c->bucket_alloc);
1088	ctxt->output_blen = 0;
1089	ctxt->output_length = 0;
1090
1091	/* Initialize GnuTLS Library */
1092	int err = 0;
1093	if (ctxt->is_proxy == GNUTLS_ENABLED_TRUE)
1094	{
1095	/* this is an outgoing proxy connection, client mode */
1096	err = gnutls_init(&ctxt->session, GNUTLS_CLIENT);
1097	if (err != GNUTLS_E_SUCCESS)
1098	ap_log_cerror(APLOG_MARK, APLOG_ERR, err, c,
1099	"gnutls_init for proxy connection failed: %s (%d)",
1100	gnutls_strerror(err), err);
1101	}
1102	else
1103	{
1104	/* incoming connection, server mode */
1105	err = gnutls_init(&ctxt->session, GNUTLS_SERVER);
1106	if (err != GNUTLS_E_SUCCESS)
1107	ap_log_cerror(APLOG_MARK, APLOG_ERR, err, c,
1108	"gnutls_init for server side failed: %s (%d)",
1109	gnutls_strerror(err), err);
1110	}
1111
1112	/* Ensure TLS session resources are released when the connection
1113	* pool is cleared, if the filters haven't done that already. */
1114	apr_pool_pre_cleanup_register(c->pool, ctxt, cleanup_gnutls_session);
1115
1116	/* Set Default Priority */
1117	err = gnutls_priority_set(ctxt->session, default_prio);
1118	if (err != GNUTLS_E_SUCCESS)
1119	ap_log_cerror(APLOG_MARK, APLOG_ERR, err, c,
1120	"gnutls_priority_set failed!");
1121	/* Set Handshake function */
1122	gnutls_handshake_set_post_client_hello_function(ctxt->session,
1123	mgs_select_virtual_server_cb);
1124
1125	/* Set GnuTLS user pointer, so we can access the module session
1126	* context in GnuTLS callbacks */
1127	gnutls_session_set_ptr(ctxt->session, ctxt);
1128
1129	/* If mod_gnutls is the TLS server, mgs_select_virtual_server_cb
1130	* will load appropriate credentials during handshake. However,
1131	* when handling a proxy backend connection, mod_gnutls acts as
1132	* TLS client and credentials must be loaded here. */
1133	if (ctxt->is_proxy == GNUTLS_ENABLED_TRUE)
1134	{
1135	/* Set anonymous client credentials for proxy connections */
1136	gnutls_credentials_set(ctxt->session, GNUTLS_CRD_ANON,
1137	ctxt->sc->anon_client_creds);
1138	/* Set x509 credentials */
1139	gnutls_credentials_set(ctxt->session, GNUTLS_CRD_CERTIFICATE,
1140	ctxt->sc->proxy_x509_creds);
1141	/* Load priorities from the server configuration */
1142	err = gnutls_priority_set(ctxt->session, ctxt->sc->proxy_priorities);
1143	if (err != GNUTLS_E_SUCCESS)
1144	ap_log_cerror(APLOG_MARK, APLOG_ERR, err, c,
1145	"%s: setting priorities for proxy connection "
1146	"failed: %s (%d)",
1147	__func__, gnutls_strerror(err), err);
1148	}
1149
1150	prepare_alpn_proposals(ctxt);
1151
1152	/* Initialize Session Cache */
1153	mgs_cache_session_init(ctxt);
1154
1155	/* Set pull, push & ptr functions */
1156	gnutls_transport_set_pull_function(ctxt->session,
1157	mgs_transport_read);
1158	gnutls_transport_set_push_function(ctxt->session,
1159	mgs_transport_write);
1160	gnutls_transport_set_ptr(ctxt->session, ctxt);
1161	/* Add IO filters */
1162	ctxt->input_filter = ap_add_input_filter(GNUTLS_INPUT_FILTER_NAME,
1163	ctxt, NULL, c);
1164	ctxt->output_filter = ap_add_output_filter(GNUTLS_OUTPUT_FILTER_NAME,
1165	ctxt, NULL, c);
1166	}
1167
1168	int mgs_hook_pre_connection(conn_rec * c, void *csd __attribute__((unused)))
1169	{
1170	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
1171
1172	if (c->master)
1173	{
1174	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, c,
1175	"%s declined secondary connection", __func__);
1176	return DECLINED;
1177	}
1178
1179	mgs_srvconf_rec sc = (mgs_srvconf_rec )
1180	ap_get_module_config(c->base_server->module_config, &gnutls_module);
1181	mgs_handle_t ctxt = (mgs_handle_t )
1182	ap_get_module_config(c->conn_config, &gnutls_module);
1183
1184	if ((sc && (!sc->enabled))
1185	\|\| (ctxt && ctxt->enabled == GNUTLS_ENABLED_FALSE))
1186	{
1187	ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, "%s declined connection",
1188	__func__);
1189	return DECLINED;
1190	}
1191
1192	create_gnutls_handle(c);
1193	return OK;
1194	}
1195
1196
1197
1198	/**
1199	* process_connection hook: Do a zero byte read to trigger the
1200	* handshake. Doesn't change anything for traditional protocols that
1201	* just do reads, but HTTP/2 needs the TLS handshake and ALPN to
1202	* happen before its process_connection hook runs.
1203	*/
1204	int mgs_hook_process_connection(conn_rec* c)
1205	{
1206	mgs_handle_t ctxt = (mgs_handle_t )
1207	ap_get_module_config(c->conn_config, &gnutls_module);
1208
1209	if ((ctxt != NULL) && (ctxt->enabled == GNUTLS_ENABLED_TRUE))
1210	{
1211	/* This connection is supposed to use TLS. Give the filters a
1212	* kick with a zero byte read to trigger the handshake. */
1213	apr_bucket_brigade* temp =
1214	apr_brigade_create(c->pool, c->bucket_alloc);
1215	ap_get_brigade(c->input_filters, temp,
1216	AP_MODE_INIT, APR_BLOCK_READ, 0);
1217	apr_brigade_destroy(temp);
1218	}
1219	return DECLINED;
1220	}
1221
1222
1223
1224	/* Post request hook, checks if TLS connection and vhost match */
1225	int mgs_req_vhost_check(request_rec *r)
1226	{
1227	/* mod_gnutls server record for the request vhost */
1228	mgs_srvconf_rec r_sc = (mgs_srvconf_rec )
1229	ap_get_module_config(r->server->module_config, &gnutls_module);
1230	mgs_handle_t *ctxt = get_effective_gnutls_ctxt(r->connection);
1231
1232	/* Nothing to check for non-TLS and outgoing proxy connections */
1233	if (ctxt == NULL \|\| !ctxt->enabled \|\| ctxt->is_proxy)
1234	return DECLINED;
1235
1236	if (ctxt->sc != r_sc)
1237	{
1238	ap_log_cerror(APLOG_MARK, APLOG_ERR, APR_SUCCESS, ctxt->c,
1239	"%s: Mismatch between handshake and request servers!",
1240	__func__);
1241	return HTTP_MISDIRECTED_REQUEST;
1242	}
1243
1244	if (!ctxt->sni_name)
1245	return DECLINED;
1246
1247	/* Got an SNI name, so verify it matches. */
1248	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, APR_SUCCESS, ctxt->c,
1249	"%s: Checking request hostname against SNI name '%s'.",
1250	__func__, ctxt->sni_name);
1251
1252	if (!r->hostname)
1253	{
1254	ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, r->connection,
1255	"Client requested '%s' via SNI, but provided "
1256	"no hostname in HTTP request!", ctxt->sni_name);
1257	return HTTP_MISDIRECTED_REQUEST;
1258	}
1259
1260	if (strcasecmp(r->hostname, ctxt->sni_name) != 0)
1261	{
1262	ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, r->connection,
1263	"Client requested '%s' via SNI, but '%s' in "
1264	"the HTTP request!", ctxt->sni_name, r->hostname);
1265	return HTTP_MISDIRECTED_REQUEST;
1266	}
1267
1268	return DECLINED;
1269	}
1270
1271
1272
1273	int mgs_hook_fixups(request_rec * r) {
1274	unsigned char sbuf[GNUTLS_MAX_SESSION_ID];
1275	const char *tmp;
1276	size_t len;
1277	mgs_handle_t *ctxt;
1278	int rv = OK;
1279
1280	if (r == NULL)
1281	return DECLINED;
1282
1283	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
1284	apr_table_t *env = r->subprocess_env;
1285
1286	ctxt = get_effective_gnutls_ctxt(r->connection);
1287
1288	if (!ctxt \|\| ctxt->enabled != GNUTLS_ENABLED_TRUE \|\| ctxt->session == NULL)
1289	{
1290	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "request declined in %s", __func__);
1291	return DECLINED;
1292	}
1293
1294	apr_table_setn(env, "HTTPS", "on");
1295
1296	apr_table_setn(env, "SSL_VERSION_LIBRARY",
1297	"GnuTLS/" LIBGNUTLS_VERSION);
1298	apr_table_setn(env, "SSL_VERSION_INTERFACE",
1299	"mod_gnutls/" MOD_GNUTLS_VERSION);
1300
1301	apr_table_setn(env, "SSL_PROTOCOL",
1302	gnutls_protocol_get_name(gnutls_protocol_get_version(ctxt->session)));
1303
1304	/* should have been called SSL_CIPHERSUITE instead */
1305	apr_table_setn(env, "SSL_CIPHER",
1306	gnutls_cipher_suite_get_name(gnutls_kx_get(ctxt->session),
1307	gnutls_cipher_get(ctxt->session),
1308	gnutls_mac_get(ctxt->session)));
1309
1310	#if GNUTLS_VERSION_NUMBER >= 0x030600
1311	/* Compression support has been removed since GnuTLS 3.6.0 */
1312	apr_table_setn(env, "SSL_COMPRESS_METHOD", "NULL");
1313	#else
1314	apr_table_setn(env, "SSL_COMPRESS_METHOD",
1315	gnutls_compression_get_name(gnutls_compression_get(ctxt->session)));
1316	#endif
1317
1318	#ifdef ENABLE_SRP
1319	if (ctxt->sc->srp_tpasswd_conf_file != NULL && ctxt->sc->srp_tpasswd_file != NULL) {
1320	tmp = gnutls_srp_server_get_username(ctxt->session);
1321	apr_table_setn(env, "SSL_SRP_USER", (tmp != NULL) ? tmp : "");
1322	} else {
1323	apr_table_unset(env, "SSL_SRP_USER");
1324	}
1325	#endif
1326
1327	if (apr_table_get(env, "SSL_CLIENT_VERIFY") == NULL)
1328	apr_table_setn(env, "SSL_CLIENT_VERIFY", "NONE");
1329
1330	unsigned int key_size = 8 * gnutls_cipher_get_key_size(gnutls_cipher_get(ctxt->session));
1331	tmp = apr_psprintf(r->pool, "%u", key_size);
1332
1333	apr_table_setn(env, "SSL_CIPHER_USEKEYSIZE", tmp);
1334
1335	apr_table_setn(env, "SSL_CIPHER_ALGKEYSIZE", tmp);
1336
1337	apr_table_setn(env, "SSL_CIPHER_EXPORT",
1338	(key_size <= 40) ? "true" : "false");
1339
1340	int dhsize = gnutls_dh_get_prime_bits(ctxt->session);
1341	if (dhsize > 0) {
1342	tmp = apr_psprintf(r->pool, "%d", dhsize);
1343	apr_table_setn(env, "SSL_DH_PRIME_BITS", tmp);
1344	}
1345
1346	len = sizeof (sbuf);
1347	gnutls_session_get_id(ctxt->session, sbuf, &len);
1348	apr_table_setn(env, "SSL_SESSION_ID",
1349	apr_pescape_hex(r->pool, sbuf, len, 0));
1350
1351	if (gnutls_certificate_type_get(ctxt->session) == GNUTLS_CRT_X509) {
1352	mgs_add_common_cert_vars(r, ctxt->sc->certs_x509_crt_chain[0], 0,
1353	ctxt->sc->export_certificates_size);
1354	}
1355
1356	return rv;
1357	}
1358
1359	int mgs_hook_authz(request_rec * r) {
1360	int rv;
1361	mgs_handle_t *ctxt;
1362	mgs_dirconf_rec *dc;
1363
1364	if (r == NULL)
1365	return DECLINED;
1366
1367	dc = ap_get_module_config(r->per_dir_config, &gnutls_module);
1368
1369	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
1370	ctxt = get_effective_gnutls_ctxt(r->connection);
1371
1372	if (!ctxt \|\| ctxt->session == NULL) {
1373	return DECLINED;
1374	}
1375
1376	if (dc->client_verify_mode == GNUTLS_CERT_IGNORE) {
1377	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1378	"GnuTLS: Directory set to Ignore Client Certificate!");
1379	} else {
1380	if (ctxt->sc->client_verify_mode < dc->client_verify_mode) {
1381	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1382	"GnuTLS: Attempting to rehandshake with peer. %d %d",
1383	ctxt->sc->client_verify_mode,
1384	dc->client_verify_mode);
1385
1386	/* If we already have a client certificate, there's no point in
1387	* re-handshaking... */
1388	rv = mgs_cert_verify(r, ctxt);
1389	if (rv != DECLINED && rv != HTTP_FORBIDDEN)
1390	return rv;
1391
1392	gnutls_certificate_server_set_request
1393	(ctxt->session, dc->client_verify_mode);
1394
1395	if (mgs_rehandshake(ctxt) != 0) {
1396	return HTTP_FORBIDDEN;
1397	}
1398	} else if (ctxt->sc->client_verify_mode ==
1399	GNUTLS_CERT_IGNORE) {
1400	#if MOD_GNUTLS_DEBUG
1401	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1402	"GnuTLS: Peer is set to IGNORE");
1403	#endif
1404	return DECLINED;
1405	}
1406	rv = mgs_cert_verify(r, ctxt);
1407	if (rv != DECLINED
1408	&& (rv != HTTP_FORBIDDEN
1409	\|\| dc->client_verify_mode == GNUTLS_CERT_REQUIRE
1410	\|\| (dc->client_verify_mode == -1
1411	&& ctxt->sc->client_verify_mode == GNUTLS_CERT_REQUIRE)))
1412	{
1413	return rv;
1414	}
1415	}
1416
1417	return DECLINED;
1418	}
1419
1420	/* variables that are not sent by default:
1421	*
1422	* SSL_CLIENT_CERT string PEM-encoded client certificate
1423	* SSL_SERVER_CERT string PEM-encoded client certificate
1424	*/
1425
1426	/* @param side is either 0 for SERVER or 1 for CLIENT
1427	*
1428	* @param export_cert_size (int) maximum size for environment variable
1429	* to use for the PEM-encoded certificate (0 means do not export)
1430	*/
1431	#define MGS_SIDE(suffix) ((side==0) ? "SSL_SERVER" suffix : "SSL_CLIENT" suffix)
1432
1433	static void mgs_add_common_cert_vars(request_rec * r, gnutls_x509_crt_t cert, int side, size_t export_cert_size) {
1434	unsigned char sbuf[64]; /* buffer to hold serials */
1435	char buf[AP_IOBUFSIZE];
1436	const char *tmp;
1437	char *tmp2;
1438	size_t len;
1439	int ret;
1440
1441	if (r == NULL)
1442	return;
1443
1444	apr_table_t *env = r->subprocess_env;
1445
1446	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
1447	if (export_cert_size > 0) {
1448	len = 0;
1449	ret = gnutls_x509_crt_export(cert, GNUTLS_X509_FMT_PEM, NULL, &len);
1450	if (ret == GNUTLS_E_SHORT_MEMORY_BUFFER) {
1451	if (len >= export_cert_size) {
1452	apr_table_setn(env, MGS_SIDE("_CERT"), "GNUTLS_CERTIFICATE_SIZE_LIMIT_EXCEEDED");
1453	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1454	"GnuTLS: Failed to export too-large X.509 certificate to environment");
1455	} else {
1456	char* cert_buf = apr_palloc(r->pool, len + 1);
1457	if (cert_buf != NULL && gnutls_x509_crt_export(cert, GNUTLS_X509_FMT_PEM, cert_buf, &len) >= 0) {
1458	cert_buf[len] = 0;
1459	apr_table_setn(env, MGS_SIDE("_CERT"), cert_buf);
1460	} else {
1461	ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r,
1462	"GnuTLS: failed to export X.509 certificate");
1463	}
1464	}
1465	} else {
1466	ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r,
1467	"GnuTLS: dazed and confused about X.509 certificate size");
1468	}
1469	}
1470
1471	len = sizeof (buf);
1472	gnutls_x509_crt_get_dn(cert, buf, &len);
1473	apr_table_setn(env, MGS_SIDE("_S_DN"), apr_pstrmemdup(r->pool, buf, len));
1474
1475	len = sizeof (buf);
1476	gnutls_x509_crt_get_issuer_dn(cert, buf, &len);
1477	apr_table_setn(env, MGS_SIDE("_I_DN"), apr_pstrmemdup(r->pool, buf, len));
1478
1479	len = sizeof (sbuf);
1480	gnutls_x509_crt_get_serial(cert, sbuf, &len);
1481	apr_table_setn(env, MGS_SIDE("_M_SERIAL"),
1482	apr_pescape_hex(r->pool, sbuf, len, 0));
1483
1484	ret = gnutls_x509_crt_get_version(cert);
1485	if (ret > 0)
1486	apr_table_setn(env, MGS_SIDE("_M_VERSION"),
1487	apr_psprintf(r->pool, "%u", ret));
1488
1489	apr_table_setn(env, MGS_SIDE("_CERT_TYPE"), "X.509");
1490
1491	tmp =
1492	mgs_time2sz(gnutls_x509_crt_get_expiration_time
1493	(cert), buf, sizeof (buf));
1494	apr_table_setn(env, MGS_SIDE("_V_END"), apr_pstrdup(r->pool, tmp));
1495
1496	tmp =
1497	mgs_time2sz(gnutls_x509_crt_get_activation_time
1498	(cert), buf, sizeof (buf));
1499	apr_table_setn(env, MGS_SIDE("_V_START"), apr_pstrdup(r->pool, tmp));
1500
1501	ret = gnutls_x509_crt_get_signature_algorithm(cert);
1502	if (ret >= 0) {
1503	apr_table_setn(env, MGS_SIDE("_A_SIG"),
1504	gnutls_sign_algorithm_get_name(ret));
1505	}
1506
1507	ret = gnutls_x509_crt_get_pk_algorithm(cert, NULL);
1508	if (ret >= 0) {
1509	apr_table_setn(env, MGS_SIDE("_A_KEY"),
1510	gnutls_pk_algorithm_get_name(ret));
1511	}
1512
1513	/* export all the alternative names (DNS, RFC822 and URI) */
1514	for (int i = 0; !(ret < 0); i++)
1515	{
1516	const char san, sanlabel;
1517	len = 0;
1518	ret = gnutls_x509_crt_get_subject_alt_name(cert, i,
1519	NULL, &len,
1520	NULL);
1521
1522	if (ret == GNUTLS_E_SHORT_MEMORY_BUFFER && len > 1) {
1523	tmp2 = apr_palloc(r->pool, len + 1);
1524
1525	ret =
1526	gnutls_x509_crt_get_subject_alt_name(cert, i,
1527	tmp2,
1528	&len,
1529	NULL);
1530	tmp2[len] = 0;
1531
1532	sanlabel = apr_psprintf(r->pool, "%s%u", MGS_SIDE("_S_AN"), i);
1533	if (ret == GNUTLS_SAN_DNSNAME) {
1534	san = apr_psprintf(r->pool, "DNSNAME:%s", tmp2);
1535	} else if (ret == GNUTLS_SAN_RFC822NAME) {
1536	san = apr_psprintf(r->pool, "RFC822NAME:%s", tmp2);
1537	} else if (ret == GNUTLS_SAN_URI) {
1538	san = apr_psprintf(r->pool, "URI:%s", tmp2);
1539	} else {
1540	san = "UNSUPPORTED";
1541	}
1542	apr_table_setn(env, sanlabel, san);
1543	}
1544	}
1545	}
1546
1547
1548
1549	/* TODO: Allow client sending a X.509 certificate chain */
1550	static int mgs_cert_verify(request_rec * r, mgs_handle_t * ctxt) {
1551	const gnutls_datum_t *cert_list;
1552	unsigned int cert_list_size;
1553	/* assume the certificate is invalid unless explicitly set
1554	* otherwise */
1555	unsigned int status = GNUTLS_CERT_INVALID;
1556	int rv = GNUTLS_E_NO_CERTIFICATE_FOUND, ret;
1557	unsigned int ch_size = 0;
1558
1559	// TODO: union no longer needed here after removing its "pgp" component.
1560	union {
1561	gnutls_x509_crt_t x509[MAX_CHAIN_SIZE];
1562	} cert;
1563	apr_time_t expiration_time, cur_time;
1564
1565	if (r == NULL \|\| ctxt == NULL \|\| ctxt->session == NULL)
1566	return HTTP_FORBIDDEN;
1567
1568	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
1569	cert_list =
1570	gnutls_certificate_get_peers(ctxt->session, &cert_list_size);
1571
1572	if (cert_list == NULL \|\| cert_list_size == 0) {
1573	/* It is perfectly OK for a client not to send a certificate if on REQUEST mode
1574	*/
1575	if (ctxt->sc->client_verify_mode == GNUTLS_CERT_REQUEST)
1576	return OK;
1577
1578	/* no certificate provided by the client, but one was required. */
1579	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1580	"GnuTLS: Failed to Verify Peer: "
1581	"Client did not submit a certificate");
1582	return HTTP_FORBIDDEN;
1583	}
1584
1585	if (gnutls_certificate_type_get(ctxt->session) == GNUTLS_CRT_X509) {
1586	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1587	"GnuTLS: A Chain of %d certificate(s) was provided for validation",
1588	cert_list_size);
1589
1590	for (ch_size = 0; ch_size < cert_list_size; ch_size++) {
1591	gnutls_x509_crt_init(&cert.x509[ch_size]);
1592	rv = gnutls_x509_crt_import(cert.x509[ch_size],
1593	&cert_list[ch_size],
1594	GNUTLS_X509_FMT_DER);
1595	// When failure to import, leave the loop
1596	if (rv != GNUTLS_E_SUCCESS) {
1597	if (ch_size < 1) {
1598	ap_log_rerror(APLOG_MARK,
1599	APLOG_INFO, 0, r,
1600	"GnuTLS: Failed to Verify Peer: "
1601	"Failed to import peer certificates.");
1602	ret = HTTP_FORBIDDEN;
1603	goto exit;
1604	}
1605	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1606	"GnuTLS: Failed to import some peer certificates. Using %d certificates",
1607	ch_size);
1608	rv = GNUTLS_E_SUCCESS;
1609	break;
1610	}
1611	}
1612	} else
1613	return HTTP_FORBIDDEN;
1614
1615	if (rv < 0) {
1616	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1617	"GnuTLS: Failed to Verify Peer: "
1618	"Failed to import peer certificates.");
1619	ret = HTTP_FORBIDDEN;
1620	goto exit;
1621	}
1622
1623	if (gnutls_certificate_type_get(ctxt->session) == GNUTLS_CRT_X509) {
1624	apr_time_ansi_put(&expiration_time,
1625	gnutls_x509_crt_get_expiration_time
1626	(cert.x509[0]));
1627
1628	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1629	"GnuTLS: Verifying list of %d certificate(s) via method '%s'",
1630	ch_size, mgs_readable_cvm(ctxt->sc->client_verify_method));
1631	switch(ctxt->sc->client_verify_method) {
1632	case mgs_cvm_cartel:
1633	rv = gnutls_x509_crt_list_verify(cert.x509, ch_size,
1634	ctxt->sc->ca_list,
1635	ctxt->sc->ca_list_size,
1636	NULL, 0, 0, &status);
1637	break;
1638	#ifdef ENABLE_MSVA
1639	case mgs_cvm_msva:
1640	{
1641	struct msv_response* resp = NULL;
1642	struct msv_query q = { .context="https", .peertype="client", .pkctype="x509pem" };
1643	msv_ctxt_t ctx = msv_ctxt_init(NULL);
1644	char cert_pem_buf[10 * 1024];
1645	size_t len = sizeof (cert_pem_buf);
1646
1647	rv = 0;
1648	if (gnutls_x509_crt_export(cert.x509[0], GNUTLS_X509_FMT_PEM, cert_pem_buf, &len) >= 0) {
1649	/* FIXME : put together a name from the cert we received, instead of hard-coding this value: */
1650	q.peername = mgs_x509_construct_uid(r, cert.x509[0]);
1651	q.pkcdata = cert_pem_buf;
1652	rv = msv_query_agent(ctx, q, &resp);
1653	if (rv == LIBMSV_ERROR_SUCCESS) {
1654	status = 0;
1655	} else if (rv == LIBMSV_ERROR_INVALID) {
1656	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1657	"GnuTLS: Monkeysphere validation failed: (message: %s)", resp->message);
1658	status = GNUTLS_CERT_INVALID;
1659	} else {
1660	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1661	"GnuTLS: Error communicating with the Monkeysphere Validation Agent: (%d) %s", rv, msv_strerror(ctx, rv));
1662	status = GNUTLS_CERT_INVALID;
1663	rv = -1;
1664	}
1665	} else {
1666	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1667	"GnuTLS: Could not convert the client certificate to PEM format");
1668	status = GNUTLS_CERT_INVALID;
1669	rv = GNUTLS_E_ASN1_ELEMENT_NOT_FOUND;
1670	}
1671	msv_response_destroy(resp);
1672	msv_ctxt_destroy(ctx);
1673	}
1674	break;
1675	#endif
1676	default:
1677	/* If this block is reached, that indicates a
1678	* configuration error or bug in mod_gnutls (invalid value
1679	* of ctxt->sc->client_verify_method). */
1680	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1681	"GnuTLS: Failed to Verify X.509 Peer: method '%s' is not supported",
1682	mgs_readable_cvm(ctxt->sc->client_verify_method));
1683	rv = GNUTLS_E_UNIMPLEMENTED_FEATURE;
1684	}
1685
1686	} else {
1687	/* Unknown certificate type */
1688	rv = GNUTLS_E_UNIMPLEMENTED_FEATURE;
1689	}
1690
1691	/* "goto exit" at the end of this block skips evaluation of the
1692	* "status" variable */
1693	if (rv < 0) {
1694	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1695	"GnuTLS: Failed to Verify Peer certificate: (%d) %s",
1696	rv, gnutls_strerror(rv));
1697	if (rv == GNUTLS_E_NO_CERTIFICATE_FOUND)
1698	ap_log_rerror(APLOG_MARK, APLOG_EMERG, 0, r,
1699	"GnuTLS: No certificate was found for verification. Did you set the GnuTLSClientCAFile directive?");
1700	ret = HTTP_FORBIDDEN;
1701	goto exit;
1702	}
1703
1704	/* TODO: X509 CRL Verification. */
1705	/* May add later if anyone needs it.
1706	*/
1707	/* ret = gnutls_x509_crt_check_revocation(crt, crl_list, crl_list_size); */
1708
1709	cur_time = apr_time_now();
1710
1711	if (status & GNUTLS_CERT_SIGNER_NOT_FOUND) {
1712	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1713	"GnuTLS: Could not find Signer for Peer Certificate");
1714	}
1715
1716	if (status & GNUTLS_CERT_SIGNER_NOT_CA) {
1717	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1718	"GnuTLS: Peer's Certificate signer is not a CA");
1719	}
1720
1721	if (status & GNUTLS_CERT_INSECURE_ALGORITHM) {
1722	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1723	"GnuTLS: Peer's Certificate is using insecure algorithms");
1724	}
1725
1726	if (status & GNUTLS_CERT_EXPIRED
1727	\|\| status & GNUTLS_CERT_NOT_ACTIVATED) {
1728	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1729	"GnuTLS: Peer's Certificate signer is expired or not yet activated");
1730	}
1731
1732	if (status & GNUTLS_CERT_INVALID) {
1733	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1734	"GnuTLS: Peer Certificate is invalid.");
1735	} else if (status & GNUTLS_CERT_REVOKED) {
1736	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1737	"GnuTLS: Peer Certificate is revoked.");
1738	}
1739
1740	mgs_add_common_cert_vars(r, cert.x509[0], 1, ctxt->sc->export_certificates_size);
1741
1742	{
1743	/* days remaining */
1744	unsigned long remain =
1745	(apr_time_sec(expiration_time) -
1746	apr_time_sec(cur_time)) / 86400;
1747	apr_table_setn(r->subprocess_env, "SSL_CLIENT_V_REMAIN",
1748	apr_psprintf(r->pool, "%lu", remain));
1749	}
1750
1751	if (status == 0) {
1752	apr_table_setn(r->subprocess_env, "SSL_CLIENT_VERIFY",
1753	"SUCCESS");
1754	ret = OK;
1755	} else {
1756	apr_table_setn(r->subprocess_env, "SSL_CLIENT_VERIFY",
1757	"FAILED");
1758	if (ctxt->sc->client_verify_mode == GNUTLS_CERT_REQUEST)
1759	ret = OK;
1760	else
1761	ret = HTTP_FORBIDDEN;
1762	}
1763
1764	exit:
1765	if (gnutls_certificate_type_get(ctxt->session) == GNUTLS_CRT_X509)
1766	for (unsigned int i = 0; i < ch_size; i++)
1767	gnutls_x509_crt_deinit(cert.x509[i]);
1768
1769	return ret;
1770	}
1771
1772
1773
1774	#ifdef ENABLE_MSVA
1775	/* this section of code is used only when trying to talk to the MSVA */
1776	static const char* mgs_x509_leaf_oid_from_dn(apr_pool_t pool, const char oid, gnutls_x509_crt_t cert) {
1777	int rv=GNUTLS_E_SUCCESS, i;
1778	size_t sz=0, lastsz=0;
1779	char* data=NULL;
1780
1781	i = -1;
1782	while(rv != GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
1783	i++;
1784	lastsz=sz;
1785	sz=0;
1786	rv = gnutls_x509_crt_get_dn_by_oid (cert, oid, i, 0, NULL, &sz);
1787	}
1788	if (i > 0) {
1789	data = apr_palloc(pool, lastsz);
1790	sz=lastsz;
1791	rv = gnutls_x509_crt_get_dn_by_oid (cert, oid, i-1, 0, data, &sz);
1792	if (rv == GNUTLS_E_SUCCESS)
1793	return data;
1794	}
1795	return NULL;
1796	}
1797
1798	static const char* mgs_x509_first_type_from_san(apr_pool_t *pool, gnutls_x509_subject_alt_name_t target, gnutls_x509_crt_t cert) {
1799	int rv=GNUTLS_E_SUCCESS;
1800	size_t sz;
1801	char* data=NULL;
1802	unsigned int i;
1803	gnutls_x509_subject_alt_name_t thistype;
1804
1805	i = 0;
1806	while(rv != GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
1807	sz = 0;
1808	rv = gnutls_x509_crt_get_subject_alt_name2(cert, i, NULL, &sz, &thistype, NULL);
1809	if (rv == GNUTLS_E_SHORT_MEMORY_BUFFER && thistype == target) {
1810	data = apr_palloc(pool, sz);
1811	rv = gnutls_x509_crt_get_subject_alt_name2(cert, i, data, &sz, &thistype, NULL);
1812	if (rv >=0 && (thistype == target))
1813	return data;
1814	}
1815	i++;
1816	}
1817	return NULL;
1818	}
1819
1820
1821	/* Create a string representing a candidate User ID from an X.509
1822	* certificate
1823
1824	* We need this for client certification because a client gives us a
1825	* certificate, but doesn't tell us (in any other way) who they are
1826	* trying to authenticate as.
1827
1828	* one complaint might be "but the user wanted to be another identity,
1829	* which is also in the certificate (e.g. in a SubjectAltName)"
1830	* However, given that any user can regenerate their own X.509
1831	* certificate with their own public key content, they should just do
1832	* so, and not expect us to guess at their identity :)
1833
1834	* This function allocates it's response from the pool given it. When
1835	* that pool is reclaimed, the response will also be deallocated.
1836
1837	* FIXME: what about extracting a server-style cert
1838	* (e.g. https://imposter.example) from the DN or any sAN?
1839
1840	* FIXME: what if we want to call this outside the context of a
1841	* request? That complicates the logging.
1842	*/
1843	static const char* mgs_x509_construct_uid(request_rec *r, gnutls_x509_crt_t cert) {
1844	/* basic strategy, assuming humans are the users: we are going to
1845	* try to reconstruct a "conventional" User ID by pulling in a
1846	* name, comment, and e-mail address.
1847	*/
1848	apr_pool_t *pool = r->pool;
1849	const char name=NULL, comment=NULL, *email=NULL;
1850	const char *ret=NULL;
1851	/* subpool for temporary allocation: */
1852	apr_pool_t *sp=NULL;
1853
1854	if (APR_SUCCESS != apr_pool_create(&sp, pool))
1855	return NULL; /* i'm assuming that libapr would log this kind
1856	* of error on its own */
1857
1858	/* Name
1859
1860	the name comes from the leaf commonName of the cert's Subject.
1861
1862	(MAYBE: should we look at trying to assemble a candidate from
1863	givenName, surName, suffix, etc? the "name" field
1864	appears to be case-insensitive, which seems problematic
1865	from what we expect; see:
1866	http://www.itu.int/rec/T-REC-X.520-200102-s/e )
1867
1868	(MAYBE: should we try pulling a commonName or otherName or
1869	something from subjectAltName? see:
1870	https://tools.ietf.org/html/rfc5280#section-4.2.1.6
1871	GnuTLS does not support looking for Common Names in the
1872	SAN yet)
1873	*/
1874	name = mgs_x509_leaf_oid_from_dn(sp, GNUTLS_OID_X520_COMMON_NAME, cert);
1875
1876	/* Comment
1877
1878	I am inclined to punt on this for now, as Comment has been so
1879	atrociously misused in OpenPGP. Perhaps if there is a
1880	pseudonym (OID 2.5.4.65, aka GNUTLS_OID_X520_PSEUDONYM) field
1881	in the subject or sAN?
1882	*/
1883	comment = mgs_x509_leaf_oid_from_dn(sp, GNUTLS_OID_X520_PSEUDONYM, cert);
1884
1885	/* E-mail
1886
1887	This should be the the first rfc822Name from the sAN.
1888
1889	failing that, we'll take the leaf email in the certificate's
1890	subject; this is a deprecated use though.
1891	*/
1892	email = mgs_x509_first_type_from_san(sp, GNUTLS_SAN_RFC822NAME, cert);
1893	if (email == NULL)
1894	email = mgs_x509_leaf_oid_from_dn(sp, GNUTLS_OID_PKCS9_EMAIL, cert);
1895
1896	/* assemble all the parts: */
1897
1898	/* must have at least a name or an e-mail. */
1899	if (name == NULL && email == NULL) {
1900	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1901	"GnuTLS: Need either a name or an e-mail address to get a User ID from an X.509 certificate.");
1902	goto end;
1903	}
1904	if (name) {
1905	if (comment) {
1906	if (email) {
1907	ret = apr_psprintf(pool, "%s (%s) <%s>", name, comment, email);
1908	} else {
1909	ret = apr_psprintf(pool, "%s (%s)", name, comment);
1910	}
1911	} else {
1912	if (email) {
1913	ret = apr_psprintf(pool, "%s <%s>", name, email);
1914	} else {
1915	ret = apr_pstrdup(pool, name);
1916	}
1917	}
1918	} else {
1919	if (comment) {
1920	ret = apr_psprintf(pool, "(%s) <%s>", comment, email);
1921	} else {
1922	ret = apr_psprintf(pool, "<%s>", email);
1923	}
1924	}
1925
1926	end:
1927	apr_pool_destroy(sp);
1928	return ret;
1929	}
1930	#endif /* ENABLE_MSVA */
1931
1932
1933
1934	/*
1935	* This hook writes the mod_gnutls status message for a mod_status
1936	* report. According to the comments in mod_status.h, the "flags"
1937	* parameter is a bitwise OR of the AP_STATUS_ flags.
1938	*
1939	* Note that this implementation gives flags explicitly requesting a
1940	* simple response priority, e.g. if AP_STATUS_SHORT is set, flags
1941	* requesting an HTML report will be ignored. As of Apache 2.4.10, the
1942	* following flags were defined in mod_status.h:
1943	*
1944	* AP_STATUS_SHORT (short, non-HTML report requested)
1945	* AP_STATUS_NOTABLE (HTML report without tables)
1946	* AP_STATUS_EXTENDED (detailed report)
1947	*/
1948	static int mgs_status_hook(request_rec *r, int flags)
1949	{
1950	if (r == NULL)
1951	return OK;
1952
1953	mgs_srvconf_rec sc = (mgs_srvconf_rec )
1954	ap_get_module_config(r->server->module_config, &gnutls_module);
1955
1956	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
1957
1958	if (flags & AP_STATUS_SHORT)
1959	{
1960	ap_rprintf(r, "Using GnuTLS version: %s\n", gnutls_check_version(NULL));
1961	ap_rputs("Built against GnuTLS version: " GNUTLS_VERSION "\n", r);
1962	}
1963	else
1964	{
1965	ap_rputs("<hr>\n", r);
1966	ap_rputs("<h2>GnuTLS Information:</h2>\n<dl>\n", r);
1967
1968	ap_rprintf(r, "<dt>Using GnuTLS version:</dt><dd>%s</dd>\n",
1969	gnutls_check_version(NULL));
1970	ap_rputs("<dt>Built against GnuTLS version:</dt><dd>"
1971	GNUTLS_VERSION "</dd>\n", r);
1972	ap_rprintf(r, "<dt>Using TLS:</dt><dd>%s</dd>\n",
1973	(sc->enabled == GNUTLS_ENABLED_FALSE ? "no" : "yes"));
1974	}
1975
1976	if (sc->enabled != GNUTLS_ENABLED_FALSE)
1977	{
1978	mgs_handle_t* ctxt = get_effective_gnutls_ctxt(r->connection);
1979	if (ctxt && ctxt->session != NULL)
1980	{
1981	char* s_info = gnutls_session_get_desc(ctxt->session);
1982	if (s_info)
1983	{
1984	if (flags & AP_STATUS_SHORT)
1985	ap_rprintf(r, "Current TLS session: %s\n", s_info);
1986	else
1987	ap_rprintf(r, "<dt>Current TLS session:</dt><dd>%s</dd>\n",
1988	s_info);
1989	gnutls_free(s_info);
1990	}
1991	}
1992	}
1993
1994	if (!(flags & AP_STATUS_SHORT))
1995	ap_rputs("</dl>\n", r);
1996
1997	return OK;
1998	}
1999
2000
2001
2002	/*
2003	* Callback to check the server certificate for proxy HTTPS
2004	* connections, to be used with
2005	* gnutls_certificate_set_verify_function.
2006
2007	* Returns: 0 if certificate check was successful (certificate
2008	* trusted), non-zero otherwise (error during check or untrusted
2009	* certificate).
2010	*/
2011	static int gtls_check_server_cert(gnutls_session_t session)
2012	{
2013	mgs_handle_t ctxt = (mgs_handle_t ) gnutls_session_get_ptr(session);
2014	unsigned int status;
2015
2016	/* Get peer hostname from a note left by mod_proxy */
2017	const char *peer_hostname =
2018	apr_table_get(ctxt->c->notes, PROXY_SNI_NOTE);
2019	if (peer_hostname == NULL)
2020	ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, ctxt->c,
2021	"%s: " PROXY_SNI_NOTE " NULL, cannot check "
2022	"peer's hostname", __func__);
2023
2024	/* Verify certificate, including hostname match. Should
2025	* peer_hostname be NULL for some reason, the name is not
2026	* checked. */
2027	int err = gnutls_certificate_verify_peers3(session, peer_hostname,
2028	&status);
2029	if (err != GNUTLS_E_SUCCESS)
2030	{
2031	ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, ctxt->c,
2032	"%s: server certificate check failed: %s (%d)",
2033	__func__, gnutls_strerror(err), err);
2034	return err;
2035	}
2036
2037	if (status == 0)
2038	ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, ctxt->c,
2039	"%s: server certificate is trusted.",
2040	__func__);
2041	else
2042	{
2043	gnutls_datum_t out;
2044	/* GNUTLS_CRT_X509: ATM, only X509 is supported for proxy
2045	* certs 0: according to function API, the last argument
2046	* should be 0 */
2047	err = gnutls_certificate_verification_status_print(status,
2048	GNUTLS_CRT_X509,
2049	&out, 0);
2050	if (err != GNUTLS_E_SUCCESS)
2051	ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, ctxt->c,
2052	"%s: server verify print failed: %s (%d)",
2053	__func__, gnutls_strerror(err), err);
2054	else
2055	ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, ctxt->c,
2056	"%s: %s",
2057	__func__, out.data);
2058	gnutls_free(out.data);
2059	}
2060
2061	return status;
2062	}
2063
2064
2065
2066	static apr_status_t cleanup_proxy_x509_credentials(void *arg)
2067	{
2068	mgs_srvconf_rec sc = (mgs_srvconf_rec ) arg;
2069
2070	if (sc->proxy_x509_creds)
2071	{
2072	/* This implicitly releases the associated trust list
2073	* sc->proxy_x509_tl, too. */
2074	gnutls_certificate_free_credentials(sc->proxy_x509_creds);
2075	sc->proxy_x509_creds = NULL;
2076	sc->proxy_x509_tl = NULL;
2077	}
2078
2079	if (sc->anon_client_creds)
2080	{
2081	gnutls_anon_free_client_credentials(sc->anon_client_creds);
2082	sc->anon_client_creds = NULL;
2083	}
2084
2085	/* Deinit proxy priorities only if set from
2086	* sc->proxy_priorities_str. Otherwise the server is using the
2087	* default global priority cache, which must not be deinitialized
2088	* here. */
2089	if (sc->proxy_priorities_str && sc->proxy_priorities)
2090	{
2091	gnutls_priority_deinit(sc->proxy_priorities);
2092	sc->proxy_priorities = NULL;
2093	}
2094
2095	return APR_SUCCESS;
2096	}
2097
2098
2099
2100	static apr_status_t load_proxy_x509_credentials(apr_pool_t *pconf,
2101	apr_pool_t *ptemp,
2102	server_rec *s)
2103	{
2104	mgs_srvconf_rec sc = (mgs_srvconf_rec )
2105	ap_get_module_config(s->module_config, &gnutls_module);
2106
2107	if (sc == NULL)
2108	return APR_EGENERAL;
2109
2110	apr_status_t ret = APR_EINIT;
2111	int err = GNUTLS_E_SUCCESS;
2112
2113	/* Cleanup function for the GnuTLS structures allocated below */
2114	apr_pool_cleanup_register(pconf, sc, cleanup_proxy_x509_credentials,
2115	apr_pool_cleanup_null);
2116
2117	/* Function pool, gets destroyed before exit. */
2118	apr_pool_t *pool;
2119	ret = apr_pool_create(&pool, ptemp);
2120	if (ret != APR_SUCCESS)
2121	{
2122	ap_log_error(APLOG_MARK, APLOG_ERR, ret, s,
2123	"%s: failed to allocate function memory pool.", __func__);
2124	return ret;
2125	}
2126
2127	/* allocate credentials structures */
2128	err = gnutls_certificate_allocate_credentials(&sc->proxy_x509_creds);
2129	if (err != GNUTLS_E_SUCCESS)
2130	{
2131	ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
2132	"%s: Failed to initialize proxy credentials: (%d) %s",
2133	__func__, err, gnutls_strerror(err));
2134	return APR_EGENERAL;
2135	}
2136	err = gnutls_anon_allocate_client_credentials(&sc->anon_client_creds);
2137	if (err != GNUTLS_E_SUCCESS)
2138	{
2139	ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
2140	"%s: Failed to initialize anon credentials for proxy: "
2141	"(%d) %s", __func__, err, gnutls_strerror(err));
2142	return APR_EGENERAL;
2143	}
2144
2145	/* Check if the proxy priorities have been set, fail immediately
2146	* if not */
2147	if (sc->proxy_priorities_str == NULL)
2148	{
2149	ap_log_error(APLOG_MARK, APLOG_INFO, 0, s,
2150	"No GnuTLSProxyPriorities directive for host '%s:%d', "
2151	"using default '%s'.",
2152	s->server_hostname, s->addrs->host_port,
2153	MGS_DEFAULT_PRIORITY);
2154	sc->proxy_priorities = default_prio;
2155	}
2156	else
2157	{
2158	/* parse proxy priorities */
2159	const char *err_pos = NULL;
2160	err = gnutls_priority_init(&sc->proxy_priorities,
2161	sc->proxy_priorities_str, &err_pos);
2162	if (err != GNUTLS_E_SUCCESS)
2163	{
2164	if (ret == GNUTLS_E_INVALID_REQUEST)
2165	ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
2166	"%s: Syntax error parsing proxy priorities "
2167	"string at: %s",
2168	__func__, err_pos);
2169	else
2170	ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
2171	"Error setting proxy priorities: %s (%d)",
2172	gnutls_strerror(err), err);
2173	ret = APR_EGENERAL;
2174	}
2175	}
2176
2177	/* load certificate and key for client auth, if configured */
2178	if (sc->proxy_x509_key_file && sc->proxy_x509_cert_file)
2179	{
2180	char* cert_file = ap_server_root_relative(pool,
2181	sc->proxy_x509_cert_file);
2182	char* key_file = ap_server_root_relative(pool,
2183	sc->proxy_x509_key_file);
2184	err = gnutls_certificate_set_x509_key_file(sc->proxy_x509_creds,
2185	cert_file,
2186	key_file,
2187	GNUTLS_X509_FMT_PEM);
2188	if (err != GNUTLS_E_SUCCESS)
2189	{
2190	ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
2191	"%s: loading proxy client credentials failed: %s (%d)",
2192	__func__, gnutls_strerror(err), err);
2193	ret = APR_EGENERAL;
2194	}
2195	}
2196	else if (!sc->proxy_x509_key_file && sc->proxy_x509_cert_file)
2197	{
2198	ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
2199	"%s: proxy key file not set!", __func__);
2200	ret = APR_EGENERAL;
2201	}
2202	else if (!sc->proxy_x509_cert_file && sc->proxy_x509_key_file)
2203	{
2204	ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
2205	"%s: proxy certificate file not set!", __func__);
2206	ret = APR_EGENERAL;
2207	}
2208	else
2209	/* if both key and cert are NULL, client auth is not used */
2210	ap_log_error(APLOG_MARK, APLOG_INFO, 0, s,
2211	"%s: no client credentials for proxy", __func__);
2212
2213	/* must be set if the server certificate is to be checked */
2214	if (sc->proxy_x509_ca_file)
2215	{
2216	/* initialize the trust list */
2217	err = gnutls_x509_trust_list_init(&sc->proxy_x509_tl, 0);
2218	if (err != GNUTLS_E_SUCCESS)
2219	{
2220	ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
2221	"%s: gnutls_x509_trust_list_init failed: %s (%d)",
2222	__func__, gnutls_strerror(err), err);
2223	ret = APR_EGENERAL;
2224	}
2225
2226	char* ca_file = ap_server_root_relative(pool,
2227	sc->proxy_x509_ca_file);
2228	/* if no CRL is used, sc->proxy_x509_crl_file is NULL */
2229	char* crl_file = NULL;
2230	if (sc->proxy_x509_crl_file)
2231	crl_file = ap_server_root_relative(pool,
2232	sc->proxy_x509_crl_file);
2233
2234	/* returns number of loaded elements */
2235	err = gnutls_x509_trust_list_add_trust_file(sc->proxy_x509_tl,
2236	ca_file,
2237	crl_file,
2238	GNUTLS_X509_FMT_PEM,
2239	0 /* tl_flags */,
2240	0 /* tl_vflags */);
2241	if (err > 0)
2242	ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s,
2243	"%s: proxy CA trust list: %d structures loaded",
2244	__func__, err);
2245	else if (err == 0)
2246	ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
2247	"%s: proxy CA trust list is empty (%d)",
2248	__func__, err);
2249	else /* err < 0 */
2250	{
2251	ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
2252	"%s: error loading proxy CA trust list: %s (%d)",
2253	__func__, gnutls_strerror(err), err);
2254	ret = APR_EGENERAL;
2255	}
2256
2257	/* attach trust list to credentials */
2258	gnutls_certificate_set_trust_list(sc->proxy_x509_creds,
2259	sc->proxy_x509_tl, 0);
2260	}
2261	else
2262	ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
2263	"%s: no CA trust list for proxy connections, "
2264	"TLS connections will fail!", __func__);
2265
2266	gnutls_certificate_set_verify_function(sc->proxy_x509_creds,
2267	gtls_check_server_cert);
2268	apr_pool_destroy(pool);
2269	return ret;
2270	}

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source: mod_gnutls/src/gnutls_hooks.c @ 04753db8

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