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source: mod_gnutls/src/gnutls_hooks.c @ 4e388b0

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Last change on this file since 4e388b0 was 4e388b0, checked in by Fiona Klute <fiona.klute@…>, 4 years ago
Consistently use strcasecmp() instead of mixing in apr_strnatcasecmp()
Property mode set to `100644`
File size: 80.5 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	/* This provides strcmp and related functions */
34	#define APR_WANT_STRFUNC
35	#include <apr_want.h>
36
37	#ifdef ENABLE_MSVA
38	#include <msv/msv.h>
39	#endif
40
41	#ifdef APLOG_USE_MODULE
42	APLOG_USE_MODULE(gnutls);
43	#endif
44
45	#if MOD_GNUTLS_DEBUG
46	static apr_file_t *debug_log_fp;
47	#endif
48
49	#define IS_PROXY_STR(c) \
50	((c->is_proxy == GNUTLS_ENABLED_TRUE) ? "proxy " : "")
51
52	/** Key to encrypt session tickets. Must be kept secret. This key is
53	* generated in the `pre_config` hook and thus constant across
54	* forks. The problem with this approach is that it does not support
55	* regular key rotation. */
56	static gnutls_datum_t session_ticket_key = {NULL, 0};
57
58
59	/** Default GnuTLS priority string for mod_gnutls */
60	#define MGS_DEFAULT_PRIORITY "NORMAL"
61	/** Compiled version of MGS_DEFAULT_PRIORITY (initialized in the
62	* pre_config hook) */
63	static gnutls_priority_t default_prio;
64
65
66	static int mgs_cert_verify(request_rec * r, mgs_handle_t * ctxt);
67	/* use side==0 for server and side==1 for client */
68	static void mgs_add_common_cert_vars(request_rec * r, gnutls_x509_crt_t cert, int side, size_t export_cert_size);
69	static int mgs_status_hook(request_rec *r, int flags);
70	#ifdef ENABLE_MSVA
71	static const char* mgs_x509_construct_uid(request_rec * pool, gnutls_x509_crt_t cert);
72	#endif
73	static int load_proxy_x509_credentials(apr_pool_t pconf, apr_pool_t ptemp, server_rec *s)
74	__attribute__((nonnull));
75
76	/* Pool Cleanup Function */
77	apr_status_t mgs_cleanup_pre_config(void *data __attribute__((unused)))
78	{
79	/* Free session ticket master key */
80	#if GNUTLS_VERSION_NUMBER >= 0x030400
81	gnutls_memset(session_ticket_key.data, 0, session_ticket_key.size);
82	#endif
83	gnutls_free(session_ticket_key.data);
84	session_ticket_key.data = NULL;
85	session_ticket_key.size = 0;
86
87	/* Deinit default priority setting */
88	gnutls_priority_deinit(default_prio);
89	return APR_SUCCESS;
90	}
91
92	/* Logging Function for Maintainers */
93	#if MOD_GNUTLS_DEBUG
94	static void gnutls_debug_log_all(int level, const char *str) {
95	apr_file_printf(debug_log_fp, "<%d> %s", level, str);
96	}
97	#define _gnutls_log apr_file_printf
98	#else
99	#define _gnutls_log(...)
100	#endif
101
102	static const char* mgs_readable_cvm(mgs_client_verification_method_e m) {
103	switch(m) {
104	case mgs_cvm_unset:
105	return "unset";
106	case mgs_cvm_cartel:
107	return "cartel";
108	case mgs_cvm_msva:
109	return "msva";
110	}
111	return "unknown";
112	}
113
114	/* Pre-Configuration HOOK: Runs First */
115	int mgs_hook_pre_config(apr_pool_t * pconf, apr_pool_t * plog, apr_pool_t * ptemp __attribute__((unused))) {
116
117	/* Maintainer Logging */
118	#if MOD_GNUTLS_DEBUG
119	apr_file_open(&debug_log_fp, "/tmp/gnutls_debug", APR_APPEND \| APR_WRITE \| APR_CREATE, APR_OS_DEFAULT, pconf);
120	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
121	gnutls_global_set_log_level(9);
122	gnutls_global_set_log_function(gnutls_debug_log_all);
123	_gnutls_log(debug_log_fp, "gnutls: %s\n", gnutls_check_version(NULL));
124	#endif
125
126	int ret;
127
128	/* Check for required GnuTLS Library Version */
129	if (gnutls_check_version(LIBGNUTLS_VERSION) == NULL) {
130	ap_log_perror(APLOG_MARK, APLOG_EMERG, 0, plog, "gnutls_check_version() failed. Required: "
131	"gnutls-%s Found: gnutls-%s", LIBGNUTLS_VERSION, gnutls_check_version(NULL));
132	return DONE;
133	}
134
135	/* Generate a Session Key */
136	ret = gnutls_session_ticket_key_generate(&session_ticket_key);
137	if (ret < 0) {
138	ap_log_perror(APLOG_MARK, APLOG_EMERG, 0, plog, "gnutls_session_ticket_key_generate: %s", gnutls_strerror(ret));
139	return DONE;
140	}
141
142	/* Initialize default priority setting */
143	ret = gnutls_priority_init(&default_prio, MGS_DEFAULT_PRIORITY, NULL);
144	if (ret < 0)
145	{
146	ap_log_perror(APLOG_MARK, APLOG_EMERG, 0, plog,
147	"gnutls_priority_init failed for default '%s': %s (%d)",
148	MGS_DEFAULT_PRIORITY, gnutls_strerror(ret), ret);
149	return DONE;
150	}
151
152	AP_OPTIONAL_HOOK(status_hook, mgs_status_hook, NULL, NULL, APR_HOOK_MIDDLE);
153
154	ap_mutex_register(pconf, MGS_CACHE_MUTEX_NAME, NULL, APR_LOCK_DEFAULT, 0);
155	ap_mutex_register(pconf, MGS_OCSP_MUTEX_NAME, NULL, APR_LOCK_DEFAULT, 0);
156	ap_mutex_register(pconf, MGS_OCSP_CACHE_MUTEX_NAME, NULL,
157	APR_LOCK_DEFAULT, 0);
158
159	/* Register a pool clean-up function */
160	apr_pool_cleanup_register(pconf, NULL, mgs_cleanup_pre_config, apr_pool_cleanup_null);
161
162	return OK;
163	}
164
165
166
167	/**
168	* Get the list of available protocols for this connection and add it
169	* to the GnuTLS session. Must run before the client hello function.
170	*/
171	static void prepare_alpn_proposals(mgs_handle_t *ctxt)
172	{
173	/* Check if any protocol upgrades are available
174	*
175	* The "report_all" parameter to ap_get_protocol_upgrades() is 0
176	* (report only more preferable protocols) because setting it to 1
177	* doesn't actually report ALL protocols, but only all except the
178	* current one. This way we can at least list the current one as
179	* available by appending it without potentially negotiating a
180	* less preferred protocol. */
181	const apr_array_header_t *pupgrades = NULL;
182	apr_status_t ret =
183	ap_get_protocol_upgrades(ctxt->c, NULL, ctxt->c->base_server,
184	/report_all/ 0, &pupgrades);
185	if (ret != APR_SUCCESS)
186	{
187	ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, ctxt->c,
188	"%s: ap_get_protocol_upgrades() failed, "
189	"cannot configure ALPN!", __func__);
190	return;
191	}
192
193	if (pupgrades == NULL \|\| pupgrades->nelts == 0)
194	{
195	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, ctxt->c,
196	"%s: No protocol upgrades available.", __func__);
197	return;
198	}
199
200	ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, ctxt->c,
201	"%s: Found %d protocol upgrade(s) for ALPN: %s",
202	__func__, pupgrades->nelts,
203	apr_array_pstrcat(ctxt->c->pool, pupgrades, ','));
204	gnutls_datum_t *alpn_protos =
205	apr_palloc(ctxt->c->pool,
206	(pupgrades->nelts + 1) * sizeof(gnutls_datum_t));
207	for (int i = 0; i < pupgrades->nelts; i++)
208	{
209	alpn_protos[i].data = (void ) APR_ARRAY_IDX(pupgrades, i, char );
210	alpn_protos[i].size =
211	strnlen(APR_ARRAY_IDX(pupgrades, i, char *),
212	pupgrades->elt_size);
213	}
214
215	/* Add the current (default) protocol at the end of the list */
216	alpn_protos[pupgrades->nelts].data =
217	(void*) apr_pstrdup(ctxt->c->pool, ap_get_protocol(ctxt->c));
218	alpn_protos[pupgrades->nelts].size =
219	strlen((char*) alpn_protos[pupgrades->nelts].data);
220	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, ctxt->c,
221	"%s: Adding current protocol %s to ALPN set.",
222	__func__, alpn_protos[pupgrades->nelts].data);
223
224	gnutls_alpn_set_protocols(ctxt->session,
225	alpn_protos,
226	pupgrades->nelts,
227	GNUTLS_ALPN_SERVER_PRECEDENCE);
228	}
229
230
231
232	/**
233	* Check if ALPN selected any protocol upgrade, try to switch if so.
234	*/
235	static int process_alpn_result(mgs_handle_t *ctxt)
236	{
237	int ret = 0;
238	gnutls_datum_t alpn_proto;
239	ret = gnutls_alpn_get_selected_protocol(ctxt->session, &alpn_proto);
240	if (ret != GNUTLS_E_SUCCESS)
241	{
242	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, APR_SUCCESS, ctxt->c,
243	"%s: No ALPN result: %s (%d)",
244	__func__, gnutls_strerror(ret), ret);
245	return GNUTLS_E_SUCCESS;
246	}
247
248	apr_array_header_t *client_protos =
249	apr_array_make(ctxt->c->pool, 1, sizeof(char *));
250	/* apr_pstrndup to ensure that the protocol is null terminated */
251	APR_ARRAY_PUSH(client_protos, char *) =
252	apr_pstrndup(ctxt->c->pool, (char*) alpn_proto.data, alpn_proto.size);
253	const char *selected =
254	ap_select_protocol(ctxt->c, NULL, ctxt->c->base_server,
255	client_protos);
256
257	/* ap_select_protocol() will return NULL if none of the ALPN
258	* proposals matched. GnuTLS negotiated alpn_proto based on the
259	* list provided by the server, but the vhost might have changed
260	* based on SNI. Apache seems to adjust the proposal list to avoid
261	* such issues though.
262	*
263	* GnuTLS will return a fatal "no_application_protocol" alert as
264	* required by RFC 7301 if the post client hello function returns
265	* GNUTLS_E_NO_APPLICATION_PROTOCOL. */
266	if (!selected)
267	{
268	ap_log_cerror(APLOG_MARK, APLOG_ERR, APR_EGENERAL, ctxt->c,
269	"%s: ap_select_protocol() returned NULL! Please "
270	"make sure any overlapping vhosts have the same "
271	"protocols available.",
272	__func__);
273	return GNUTLS_E_NO_APPLICATION_PROTOCOL;
274	}
275
276	if (strcmp(selected, ap_get_protocol(ctxt->c)) == 0)
277	{
278	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, APR_SUCCESS, ctxt->c,
279	"%s: Already using protocol '%s', nothing to do.",
280	__func__, selected);
281	return GNUTLS_E_SUCCESS;
282	}
283
284	ap_log_cerror(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, ctxt->c,
285	"%s: Switching protocol to '%s' based on ALPN.",
286	__func__, selected);
287	apr_status_t status = ap_switch_protocol(ctxt->c, NULL,
288	ctxt->c->base_server,
289	selected);
290	if (status != APR_SUCCESS)
291	{
292	ap_log_cerror(APLOG_MARK, APLOG_ERR, status, ctxt->c,
293	"%s: Protocol switch to '%s' failed!",
294	__func__, selected);
295	return GNUTLS_E_NO_APPLICATION_PROTOCOL;
296	}
297	/* ALPN done! */
298	return GNUTLS_E_SUCCESS;
299	}
300
301
302
303	/**
304	* Post client hello function for GnuTLS, used to configure the TLS
305	* server based on virtual host configuration. Uses SNI to select the
306	* virtual host if available.
307	*
308	* @param session the TLS session
309	*
310	* @return zero or a GnuTLS error code, as required by GnuTLS hook
311	* definition
312	*/
313	static int mgs_select_virtual_server_cb(gnutls_session_t session)
314	{
315	int ret = 0;
316	mgs_handle_t *ctxt = gnutls_session_get_ptr(session);
317
318	/* try to find a virtual host */
319	mgs_srvconf_rec *tsc = mgs_find_sni_server(session);
320	if (tsc != NULL)
321	{
322	/* Found a TLS vhost based on the SNI, configure the
323	* connection context. */
324	ctxt->sc = tsc;
325	}
326
327	gnutls_certificate_server_set_request(session, ctxt->sc->client_verify_mode);
328
329	/* Set x509 credentials */
330	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, ctxt->sc->certs);
331	/* Set Anon credentials */
332	gnutls_credentials_set(session, GNUTLS_CRD_ANON, ctxt->sc->anon_creds);
333
334	#ifdef ENABLE_SRP
335	/* Set SRP credentials */
336	if (ctxt->sc->srp_tpasswd_conf_file != NULL && ctxt->sc->srp_tpasswd_file != NULL) {
337	gnutls_credentials_set(session, GNUTLS_CRD_SRP, ctxt->sc->srp_creds);
338	}
339	#endif
340
341	/* Enable session tickets */
342	if (session_ticket_key.data != NULL &&
343	ctxt->sc->tickets == GNUTLS_ENABLED_TRUE)
344	{
345	ret = gnutls_session_ticket_enable_server(ctxt->session, &session_ticket_key);
346	if (ret != GNUTLS_E_SUCCESS)
347	ap_log_cerror(APLOG_MARK, APLOG_ERR, APR_EGENERAL, ctxt->c,
348	"gnutls_session_ticket_enable_server failed: %s (%d)",
349	gnutls_strerror(ret), ret);
350	}
351
352	ret = process_alpn_result(ctxt);
353	if (ret != GNUTLS_E_SUCCESS)
354	return ret;
355
356	/* Update the priorities - to avoid negotiating a ciphersuite that is not
357	* enabled on this virtual server. Note that here we ignore the version
358	* negotiation. */
359	ret = gnutls_priority_set(session, ctxt->sc->priorities);
360
361	/* actually it shouldn't fail since we have checked at startup */
362	return ret;
363	}
364
365	static int cert_retrieve_fn(gnutls_session_t session,
366	const gnutls_datum_t * req_ca_rdn __attribute__((unused)),
367	int nreqs __attribute__((unused)),
368	const gnutls_pk_algorithm_t * pk_algos __attribute__((unused)),
369	int pk_algos_length __attribute__((unused)),
370	gnutls_pcert_st **pcerts,
371	unsigned int *pcert_length,
372	gnutls_privkey_t *privkey)
373	{
374	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
375
376	mgs_handle_t *ctxt;
377
378	if (session == NULL) {
379	// ERROR INVALID SESSION
380	return -1;
381	}
382
383	ctxt = gnutls_transport_get_ptr(session);
384
385	if (gnutls_certificate_type_get(session) == GNUTLS_CRT_X509) {
386	// X509 CERTIFICATE
387	*pcerts = ctxt->sc->certs_x509_chain;
388	*pcert_length = ctxt->sc->certs_x509_chain_num;
389	*privkey = ctxt->sc->privkey_x509;
390	return 0;
391	} else {
392	// UNKNOWN CERTIFICATE
393	return -1;
394	}
395	}
396
397
398
399	#if GNUTLS_VERSION_NUMBER >= 0x030506
400	#define HAVE_KNOWN_DH_GROUPS 1
401	#endif
402	#ifdef HAVE_KNOWN_DH_GROUPS
403	/**
404	* Try to estimate a GnuTLS security parameter based on the given
405	* private key. Any errors are logged.
406	*
407	* @param s The `server_rec` to use for logging
408	*
409	* @param key The private key to use
410	*
411	* @return `gnutls_sec_param_t` as returned by
412	* `gnutls_pk_bits_to_sec_param` for the key properties, or
413	* GNUTLS_SEC_PARAM_UNKNOWN in case of error
414	*/
415	static gnutls_sec_param_t sec_param_from_privkey(server_rec *server,
416	gnutls_privkey_t key)
417	{
418	unsigned int bits = 0;
419	int pk_algo = gnutls_privkey_get_pk_algorithm(key, &bits);
420	if (pk_algo < 0)
421	{
422	ap_log_error(APLOG_MARK, APLOG_ERR, APR_EGENERAL, server,
423	"%s: Could not get private key parameters: %s (%d)",
424	__func__, gnutls_strerror(pk_algo), pk_algo);
425	return GNUTLS_SEC_PARAM_UNKNOWN;
426	}
427	return gnutls_pk_bits_to_sec_param(pk_algo, bits);
428	}
429	#else
430	/** ffdhe2048 DH group as defined in RFC 7919, Appendix A.1. This is
431	* the default DH group if mod_gnutls is compiled agains a GnuTLS
432	* version that does not provide known DH groups based on security
433	* parameters (before 3.5.6). */
434	static const char FFDHE2048_PKCS3[] =
435	"-----BEGIN DH PARAMETERS-----\n"
436	"MIIBDAKCAQEA//////////+t+FRYortKmq/cViAnPTzx2LnFg84tNpWp4TZBFGQz\n"
437	"+8yTnc4kmz75fS/jY2MMddj2gbICrsRhetPfHtXV/WVhJDP1H18GbtCFY2VVPe0a\n"
438	"87VXE15/V8k1mE8McODmi3fipona8+/och3xWKE2rec1MKzKT0g6eXq8CrGCsyT7\n"
439	"YdEIqUuyyOP7uWrat2DX9GgdT0Kj3jlN9K5W7edjcrsZCwenyO4KbXCeAvzhzffi\n"
440	"7MA0BM0oNC9hkXL+nOmFg/+OTxIy7vKBg8P+OxtMb61zO7X8vC7CIAXFjvGDfRaD\n"
441	"ssbzSibBsu/6iGtCOGEoXJf//////////wIBAgICAQA=\n"
442	"-----END DH PARAMETERS-----\n";
443	const gnutls_datum_t default_dh_params = {
444	(void *) FFDHE2048_PKCS3,
445	sizeof(FFDHE2048_PKCS3)
446	};
447	#endif
448
449
450
451	/**
452	* Configure the default DH groups to use for the given server. When
453	* compiled against GnuTLS version 3.5.6 or newer the known DH group
454	* matching the GnuTLS security parameter estimated from the private
455	* key is used. Otherwise the ffdhe2048 DH group as defined in RFC
456	* 7919, Appendix A.1 is the default.
457	*
458	* @param server the host to configure
459	*
460	* @return `OK` on success, `HTTP_UNAUTHORIZED` otherwise
461	*/
462	static int set_default_dh_param(server_rec *server)
463	{
464	mgs_srvconf_rec sc = (mgs_srvconf_rec )
465	ap_get_module_config(server->module_config, &gnutls_module);
466
467	#ifdef HAVE_KNOWN_DH_GROUPS
468	gnutls_sec_param_t seclevel = GNUTLS_SEC_PARAM_UNKNOWN;
469	if (sc->privkey_x509)
470	{
471	seclevel = sec_param_from_privkey(server, sc->privkey_x509);
472	ap_log_error(APLOG_MARK, APLOG_TRACE1, APR_SUCCESS, server,
473	"%s: GnuTLS security param estimated based on "
474	"private key '%s': %s",
475	__func__, sc->x509_key_file,
476	gnutls_sec_param_get_name(seclevel));
477	}
478
479	if (seclevel == GNUTLS_SEC_PARAM_UNKNOWN)
480	seclevel = GNUTLS_SEC_PARAM_MEDIUM;
481	ap_log_error(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, server,
482	"%s: Setting DH params for security level '%s'.",
483	__func__, gnutls_sec_param_get_name(seclevel));
484
485	int ret = gnutls_certificate_set_known_dh_params(sc->certs, seclevel);
486	if (ret < 0)
487	{
488	ap_log_error(APLOG_MARK, APLOG_EMERG, APR_EGENERAL, server,
489	"%s: setting known DH params failed: %s (%d)",
490	__func__, gnutls_strerror(ret), ret);
491	return HTTP_UNAUTHORIZED;
492	}
493	ret = gnutls_anon_set_server_known_dh_params(sc->anon_creds, seclevel);
494	if (ret < 0)
495	{
496	ap_log_error(APLOG_MARK, APLOG_EMERG, APR_EGENERAL, server,
497	"%s: setting known DH params failed: %s (%d)",
498	__func__, gnutls_strerror(ret), ret);
499	return HTTP_UNAUTHORIZED;
500	}
501	#else
502	int ret = gnutls_dh_params_init(&sc->dh_params);
503	if (ret < 0)
504	{
505	ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, server,
506	"%s: Failed to initialize DH params structure: "
507	"%s (%d)", __func__, gnutls_strerror(ret), ret);
508	return HTTP_UNAUTHORIZED;
509	}
510	ret = gnutls_dh_params_import_pkcs3(sc->dh_params, &default_dh_params,
511	GNUTLS_X509_FMT_PEM);
512	if (ret < 0)
513	{
514	ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, server,
515	"%s: Failed to import default DH params: %s (%d)",
516	__func__, gnutls_strerror(ret), ret);
517	return HTTP_UNAUTHORIZED;
518	}
519
520	gnutls_certificate_set_dh_params(sc->certs, sc->dh_params);
521	gnutls_anon_set_server_dh_params(sc->anon_creds, sc->dh_params);
522	#endif
523
524	return OK;
525	}
526
527
528
529	/**
530	* Post config hook.
531	*
532	* Must return OK or DECLINED on success, something else on
533	* error. These codes are defined in Apache httpd.h along with the
534	* HTTP status codes, so I'm going to use HTTP error codes both for
535	* fun (and to avoid conflicts).
536	*/
537	int mgs_hook_post_config(apr_pool_t *pconf,
538	apr_pool_t *plog __attribute__((unused)),
539	apr_pool_t *ptemp,
540	server_rec *base_server)
541	{
542	int rv;
543	server_rec *s;
544	mgs_srvconf_rec *sc;
545	mgs_srvconf_rec *sc_base;
546	void *data = NULL;
547	const char *userdata_key = "mgs_init";
548
549	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
550
551	apr_pool_userdata_get(&data, userdata_key, base_server->process->pool);
552	if (data == NULL) {
553	apr_pool_userdata_set((const void *) 1, userdata_key, apr_pool_cleanup_null, base_server->process->pool);
554	}
555
556	s = base_server;
557	sc_base = (mgs_srvconf_rec *) ap_get_module_config(s->module_config, &gnutls_module);
558
559
560	rv = mgs_cache_post_config(pconf, ptemp, s, sc_base);
561	if (rv != APR_SUCCESS)
562	{
563	ap_log_error(APLOG_MARK, APLOG_STARTUP, rv, s,
564	"Post config for cache failed.");
565	return HTTP_INSUFFICIENT_STORAGE;
566	}
567
568	if (sc_base->ocsp_mutex == NULL)
569	{
570	rv = ap_global_mutex_create(&sc_base->ocsp_mutex, NULL,
571	MGS_OCSP_MUTEX_NAME, NULL,
572	base_server, pconf, 0);
573	if (rv != APR_SUCCESS)
574	return rv;
575	}
576
577	/* If GnuTLSP11Module is set, load the listed PKCS #11
578	* modules. Otherwise system defaults will be used. */
579	if (sc_base->p11_modules != NULL)
580	{
581	rv = gnutls_pkcs11_init(GNUTLS_PKCS11_FLAG_MANUAL, NULL);
582	if (rv < 0)
583	{
584	ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, s,
585	"GnuTLS: Initializing PKCS #11 "
586	"failed: %s (%d).",
587	gnutls_strerror(rv), rv);
588	}
589	else
590	{
591	for (int i = 0; i < sc_base->p11_modules->nelts; i++)
592	{
593	char *p11_module =
594	APR_ARRAY_IDX(sc_base->p11_modules, i, char *);
595	rv = gnutls_pkcs11_add_provider(p11_module, NULL);
596	if (rv != GNUTLS_E_SUCCESS)
597	ap_log_error(APLOG_MARK, APLOG_STARTUP, APR_EGENERAL, s,
598	"GnuTLS: Loading PKCS #11 provider module %s "
599	"failed: %s (%d).",
600	p11_module, gnutls_strerror(rv), rv);
601	else
602	ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s,
603	"%s: PKCS #11 provider module %s loaded.",
604	__func__, p11_module);
605	}
606	}
607	}
608
609	sc_base->singleton_wd =
610	mgs_new_singleton_watchdog(base_server, MGS_SINGLETON_WATCHDOG, pconf);
611
612	for (s = base_server; s; s = s->next)
613	{
614	sc = (mgs_srvconf_rec *) ap_get_module_config(s->module_config, &gnutls_module);
615	sc->cache_enable = sc_base->cache_enable;
616	sc->cache = sc_base->cache;
617	if (sc->cache_timeout == MGS_TIMEOUT_UNSET)
618	sc->cache_timeout = sc_base->cache_timeout;
619	sc->ocsp_cache = sc_base->ocsp_cache;
620
621	sc->singleton_wd = sc_base->singleton_wd;
622
623	/* defaults for unset values: */
624	if (sc->enabled == GNUTLS_ENABLED_UNSET)
625	sc->enabled = GNUTLS_ENABLED_FALSE;
626	if (sc->tickets == GNUTLS_ENABLED_UNSET)
627	{
628	/* GnuTLS 3.6.4 introduced automatic master key rotation */
629	if (gnutls_check_version_numeric(3, 6, 4))
630	sc->tickets = GNUTLS_ENABLED_TRUE;
631	else
632	sc->tickets = GNUTLS_ENABLED_FALSE;
633	}
634	if (sc->export_certificates_size < 0)
635	sc->export_certificates_size = 0;
636	if (sc->client_verify_mode == -1)
637	sc->client_verify_mode = GNUTLS_CERT_IGNORE;
638	if (sc->client_verify_method == mgs_cvm_unset)
639	sc->client_verify_method = mgs_cvm_cartel;
640
641	// TODO: None of the stuff below needs to be done if
642	// sc->enabled == GNUTLS_ENABLED_FALSE, we could just continue
643	// to the next host.
644
645	/* Load certificates and stuff (includes parsing priority) */
646	rv = mgs_load_files(pconf, ptemp, s);
647	if (rv != 0) {
648	ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, s,
649	"%s: Loading credentials failed!", __func__);
650	return HTTP_NOT_FOUND;
651	}
652
653	sc->ocsp_mutex = sc_base->ocsp_mutex;
654	/* init OCSP configuration unless explicitly disabled */
655	if (sc->enabled && sc->ocsp_staple != GNUTLS_ENABLED_FALSE)
656	{
657	const char *err = mgs_ocsp_configure_stapling(pconf, ptemp, s);
658	if (err != NULL)
659	{
660	/* If OCSP stapling is enabled only by default ignore
661	* error and disable stapling */
662	if (sc->ocsp_staple == GNUTLS_ENABLED_UNSET)
663	{
664	ap_log_error(APLOG_MARK, APLOG_INFO, APR_SUCCESS, s,
665	"Cannnot enable OCSP stapling for "
666	"host '%s:%d': %s",
667	s->server_hostname, s->addrs->host_port, err);
668	sc->ocsp_staple = GNUTLS_ENABLED_FALSE;
669	}
670	/* If OCSP stapling is explicitly enabled this is a
671	* critical error. */
672	else
673	{
674	ap_log_error(APLOG_MARK, APLOG_STARTUP, APR_EINVAL, s,
675	"OCSP stapling configuration failed for "
676	"host '%s:%d': %s",
677	s->server_hostname, s->addrs->host_port, err);
678	return HTTP_INTERNAL_SERVER_ERROR;
679	}
680	}
681	else
682	{
683	/* Might already be set */
684	sc->ocsp_staple = GNUTLS_ENABLED_TRUE;
685	/* Set up stapling */
686	rv = mgs_ocsp_enable_stapling(pconf, ptemp, s);
687	if (rv != OK && rv != DECLINED)
688	return rv;
689	}
690	}
691
692	/* Check if the priorities have been set */
693	if (sc->priorities == NULL && sc->enabled == GNUTLS_ENABLED_TRUE) {
694	ap_log_error(APLOG_MARK, APLOG_INFO, 0, s,
695	"No GnuTLSPriorities directive for host '%s:%d', "
696	"using default '%s'.",
697	s->server_hostname, s->addrs->host_port,
698	MGS_DEFAULT_PRIORITY);
699	sc->priorities = default_prio;
700	}
701
702	/* Set host DH params from user configuration or defaults */
703	if (sc->dh_params != NULL) {
704	gnutls_certificate_set_dh_params(sc->certs, sc->dh_params);
705	gnutls_anon_set_server_dh_params(sc->anon_creds, sc->dh_params);
706	} else {
707	rv = set_default_dh_param(s);
708	if (rv != OK)
709	return rv;
710	}
711
712	/* The call after this comment is a workaround for bug in
713	* gnutls_certificate_set_retrieve_function2 that ignores
714	* supported certificate types. Should be fixed in GnuTLS
715	* 3.3.12.
716	*
717	* Details:
718	* https://lists.gnupg.org/pipermail/gnutls-devel/2015-January/007377.html
719	* Workaround from:
720	* https://github.com/vanrein/tlspool/commit/4938102d3d1b086491d147e6c8e4e2a02825fc12 */
721	#if GNUTLS_VERSION_NUMBER < 0x030312
722	gnutls_certificate_set_retrieve_function(sc->certs, (void *) exit);
723	#endif
724
725	gnutls_certificate_set_retrieve_function2(sc->certs, cert_retrieve_fn);
726
727	if ((sc->certs_x509_chain == NULL \|\| sc->certs_x509_chain_num < 1) &&
728	sc->enabled == GNUTLS_ENABLED_TRUE) {
729	ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, s,
730	"GnuTLS: Host '%s:%d' is missing a Certificate File!",
731	s->server_hostname, s->addrs->host_port);
732	return HTTP_UNAUTHORIZED;
733	}
734	if (sc->enabled == GNUTLS_ENABLED_TRUE &&
735	(sc->certs_x509_chain_num > 0 && sc->privkey_x509 == NULL))
736	{
737	ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, s,
738	"GnuTLS: Host '%s:%d' is missing a Private Key File!",
739	s->server_hostname, s->addrs->host_port);
740	return HTTP_UNAUTHORIZED;
741	}
742
743	if (sc->enabled == GNUTLS_ENABLED_TRUE
744	&& sc->proxy_enabled == GNUTLS_ENABLED_TRUE
745	&& load_proxy_x509_credentials(pconf, ptemp, s) != APR_SUCCESS)
746	{
747	ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, s,
748	"%s: loading proxy credentials for host "
749	"'%s:%d' failed, exiting!",
750	__func__, s->server_hostname, s->addrs->host_port);
751	return HTTP_PROXY_AUTHENTICATION_REQUIRED;
752	}
753	}
754
755
756	ap_add_version_component(pconf, "mod_gnutls/" MOD_GNUTLS_VERSION);
757
758	{
759	const char* libvers = gnutls_check_version(NULL);
760	char* gnutls_version = NULL;
761	if(libvers && (gnutls_version = apr_psprintf(pconf, "GnuTLS/%s", libvers))) {
762	ap_add_version_component(pconf, gnutls_version);
763	} else {
764	// In case we could not create the above string go for the static version instead
765	ap_add_version_component(pconf, "GnuTLS/" GNUTLS_VERSION "-static");
766	}
767	}
768
769	return OK;
770	}
771
772	void mgs_hook_child_init(apr_pool_t p, server_rec s)
773	{
774	apr_status_t rv = APR_SUCCESS;
775	mgs_srvconf_rec sc = (mgs_srvconf_rec )
776	ap_get_module_config(s->module_config, &gnutls_module);
777
778	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
779
780	/* if we use PKCS #11 reinitialize it */
781	if (mgs_pkcs11_reinit(s) < 0) {
782	ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s,
783	"GnuTLS: Failed to reinitialize PKCS #11");
784	exit(-1);
785	}
786
787	if (sc->cache_enable == GNUTLS_ENABLED_TRUE)
788	{
789	rv = mgs_cache_child_init(p, s, sc->cache, MGS_CACHE_MUTEX_NAME);
790	if (rv != APR_SUCCESS)
791	ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
792	"Child init for session cache failed!");
793	}
794
795	if (sc->ocsp_cache != NULL)
796	{
797	rv = mgs_cache_child_init(p, s, sc->ocsp_cache,
798	MGS_OCSP_CACHE_MUTEX_NAME);
799	if (rv != APR_SUCCESS)
800	ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
801	"Child init for OCSP cache failed!");
802	}
803
804	/* reinit OCSP request mutex */
805	const char *lockfile = apr_global_mutex_lockfile(sc->ocsp_mutex);
806	rv = apr_global_mutex_child_init(&sc->ocsp_mutex, lockfile, p);
807	if (rv != APR_SUCCESS)
808	ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
809	"Failed to reinit mutex '" MGS_OCSP_MUTEX_NAME "'.");
810
811	/* Block SIGPIPE Signals */
812	rv = apr_signal_block(SIGPIPE);
813	if(rv != APR_SUCCESS) {
814	/* error sending output */
815	ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
816	"GnuTLS: Error Blocking SIGPIPE Signal!");
817	}
818	}
819
820	const char mgs_hook_http_scheme(const request_rec r) {
821	mgs_srvconf_rec *sc;
822
823	if (r == NULL)
824	return NULL;
825
826	sc = (mgs_srvconf_rec *) ap_get_module_config(r->
827	server->module_config,
828	&gnutls_module);
829
830	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
831	if (sc->enabled == GNUTLS_ENABLED_FALSE) {
832	return NULL;
833	}
834
835	return "https";
836	}
837
838	apr_port_t mgs_hook_default_port(const request_rec * r) {
839	mgs_srvconf_rec *sc;
840
841	if (r == NULL)
842	return 0;
843
844	sc = (mgs_srvconf_rec *) ap_get_module_config(r->
845	server->module_config,
846	&gnutls_module);
847
848	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
849	if (sc->enabled == GNUTLS_ENABLED_FALSE) {
850	return 0;
851	}
852
853	return 443;
854	}
855
856	/**
857	* Default buffer size for SNI data, including the terminating NULL
858	* byte. The size matches what gnutls-cli uses initially.
859	*/
860	#define DEFAULT_SNI_HOST_LEN 256
861
862	typedef struct {
863	mgs_handle_t *ctxt;
864	mgs_srvconf_rec *sc;
865	const char *sni_name;
866	} vhost_cb_rec;
867
868	/**
869	* Matches the current vhost's ServerAlias directives
870	*
871	* @param x vhost callback record
872	* @param s server record
873	* @param tsc mod_gnutls server data for `s`
874	*
875	* @return true if a match, false otherwise
876	*
877	*/
878	int check_server_aliases(vhost_cb_rec x, server_rec s, mgs_srvconf_rec *tsc)
879	{
880	apr_array_header_t *names;
881	int rv = 0;
882	char ** name;
883
884	/* Check ServerName First! */
885	if (strcasecmp(x->sni_name, s->server_hostname) == 0) {
886	// We have a match, save this server configuration
887	x->sc = tsc;
888	rv = 1;
889	/* Check any ServerAlias directives */
890	} else if(s->names->nelts) {
891	names = s->names;
892	name = (char **) names->elts;
893	for (int i = 0; i < names->nelts; ++i)
894	{
895	if (!name[i])
896	continue;
897	if (strcasecmp(x->sni_name, name[i]) == 0)
898	{
899	// We have a match, save this server configuration
900	x->sc = tsc;
901	rv = 1;
902	}
903	}
904	/* ServerAlias directives may contain wildcards, check those last. */
905	} else if(s->wild_names->nelts) {
906	names = s->wild_names;
907	name = (char **) names->elts;
908	for (int i = 0; i < names->nelts; ++i)
909	{
910	if (!name[i])
911	continue;
912	if (ap_strcasecmp_match(x->sni_name, name[i]) == 0)
913	{
914	x->sc = tsc;
915	rv = 1;
916	}
917	}
918	}
919	return rv;
920	}
921
922	static int vhost_cb(void baton, conn_rec conn, server_rec * s)
923	{
924	mgs_srvconf_rec *tsc;
925	vhost_cb_rec *x = baton;
926	int ret;
927
928	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
929	tsc = (mgs_srvconf_rec *) ap_get_module_config(s->module_config,
930	&gnutls_module);
931
932	if (tsc->enabled != GNUTLS_ENABLED_TRUE) {
933	return 0;
934	}
935
936	if (tsc->certs_x509_chain_num > 0) {
937	/* this check is there to warn administrator of any missing hostname
938	* in the certificate. */
939	ret = gnutls_x509_crt_check_hostname(tsc->certs_x509_crt_chain[0], s->server_hostname);
940	if (0 == ret)
941	ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, conn,
942	"GnuTLS: the certificate doesn't match requested "
943	"hostname '%s'", s->server_hostname);
944	} else {
945	ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, conn,
946	"GnuTLS: SNI request for '%s' but no X.509 certs "
947	"available at all",
948	s->server_hostname);
949	}
950	return check_server_aliases(x, s, tsc);
951	}
952
953	/**
954	* Get SNI data from GnuTLS (if any) and search for a matching virtual
955	* host configuration. This method is called from the post client
956	* hello function.
957	*
958	* @param session the GnuTLS session
959	*
960	* @return either the matching mod_gnutls server config, or `NULL`
961	*/
962	mgs_srvconf_rec *mgs_find_sni_server(gnutls_session_t session)
963	{
964	mgs_handle_t *ctxt = gnutls_session_get_ptr(session);
965
966	char *sni_name = apr_palloc(ctxt->c->pool, DEFAULT_SNI_HOST_LEN);
967	size_t sni_len = DEFAULT_SNI_HOST_LEN;
968	unsigned int sni_type;
969
970	/* Search for a DNS SNI element. Note that RFC 6066 prohibits more
971	* than one server name per type. */
972	int sni_index = -1;
973	int rv = 0;
974	do {
975	/* The sni_index is incremented before each use, so if the
976	* loop terminates with a type match we will have the right
977	* one stored. */
978	rv = gnutls_server_name_get(session, sni_name,
979	&sni_len, &sni_type, ++sni_index);
980	if (rv == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
981	{
982	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, APR_EGENERAL, ctxt->c,
983	"%s: no DNS SNI found (last index: %d).",
984	__func__, sni_index);
985	return NULL;
986	}
987	} while (sni_type != GNUTLS_NAME_DNS);
988	/* The (rv == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) path inside
989	* the loop above returns, so if we reach this point we have a DNS
990	* SNI at the current index. */
991
992	if (rv == GNUTLS_E_SHORT_MEMORY_BUFFER)
993	{
994	/* Allocate a new buffer of the right size and retry */
995	sni_name = apr_palloc(ctxt->c->pool, sni_len);
996	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, APR_SUCCESS, ctxt->c,
997	"%s: reallocated SNI data buffer for %" APR_SIZE_T_FMT
998	" bytes.", __func__, sni_len);
999	rv = gnutls_server_name_get(session, sni_name,
1000	&sni_len, &sni_type, sni_index);
1001	}
1002
1003	/* Unless there's a bug in the GnuTLS API only GNUTLS_E_IDNA_ERROR
1004	* can occur here, but a catch all is safer and no more
1005	* complicated. */
1006	if (rv != GNUTLS_E_SUCCESS)
1007	{
1008	ap_log_cerror(APLOG_MARK, APLOG_INFO, APR_EGENERAL, ctxt->c,
1009	"%s: error while getting SNI DNS data: '%s' (%d).",
1010	__func__, gnutls_strerror(rv), rv);
1011	return NULL;
1012	}
1013
1014	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, APR_SUCCESS, ctxt->c,
1015	"%s: client requested server '%s'.",
1016	__func__, sni_name);
1017	ctxt->sni_name = sni_name;
1018
1019	/* Search for vhosts matching connection parameters and the
1020	* SNI. If a match is found, cbx.sc will contain the mod_gnutls
1021	* server config for the vhost. */
1022	vhost_cb_rec cbx = {
1023	.ctxt = ctxt,
1024	.sc = NULL,
1025	.sni_name = sni_name
1026	};
1027	rv = ap_vhost_iterate_given_conn(ctxt->c, vhost_cb, &cbx);
1028	if (rv == 1) {
1029	return cbx.sc;
1030	}
1031	return NULL;
1032	}
1033
1034	/**
1035	* This function is intended as a cleanup handler for connections
1036	* using GnuTLS. If attached to the connection pool, it ensures that
1037	* session resources are released with the connection pool even if the
1038	* session wasn't terminated properly.
1039	*
1040	* @param data must point to the mgs_handle_t associated with the
1041	* connection
1042	*/
1043	static apr_status_t cleanup_gnutls_session(void *data)
1044	{
1045	/* nothing to do */
1046	if (data == NULL)
1047	return APR_SUCCESS;
1048
1049	/* check if session needs closing */
1050	mgs_handle_t ctxt = (mgs_handle_t ) data;
1051	if (ctxt->session != NULL)
1052	{
1053	ap_log_cerror(APLOG_MARK, APLOG_WARNING, APR_ECONNABORTED, ctxt->c,
1054	"%s: connection pool cleanup in progress but %sTLS "
1055	"session hasn't been terminated, trying to close",
1056	__func__, IS_PROXY_STR(ctxt));
1057	int ret;
1058	/* Try A Clean Shutdown */
1059	do
1060	ret = gnutls_bye(ctxt->session, GNUTLS_SHUT_WR);
1061	while (ret == GNUTLS_E_INTERRUPTED \|\| ret == GNUTLS_E_AGAIN);
1062	if (ret != GNUTLS_E_SUCCESS)
1063	ap_log_cerror(APLOG_MARK, APLOG_INFO, APR_EGENERAL, ctxt->c,
1064	"%s: error while closing TLS %sconnection: %s (%d)",
1065	__func__, IS_PROXY_STR(ctxt),
1066	gnutls_strerror(ret), ret);
1067	else
1068	ap_log_cerror(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, ctxt->c,
1069	"%s: TLS %sconnection closed.",
1070	__func__, IS_PROXY_STR(ctxt));
1071	/* De-Initialize Session */
1072	gnutls_deinit(ctxt->session);
1073	ctxt->session = NULL;
1074	}
1075	return APR_SUCCESS;
1076	}
1077
1078	static void create_gnutls_handle(conn_rec * c)
1079	{
1080	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
1081
1082	/* Get connection specific configuration */
1083	mgs_handle_t *ctxt = init_gnutls_ctxt(c);
1084	ctxt->enabled = GNUTLS_ENABLED_TRUE;
1085	ctxt->status = 0;
1086	ctxt->input_rc = APR_SUCCESS;
1087	ctxt->input_bb = apr_brigade_create(c->pool, c->bucket_alloc);
1088	ctxt->input_cbuf.length = 0;
1089	ctxt->output_rc = APR_SUCCESS;
1090	ctxt->output_bb = apr_brigade_create(c->pool, c->bucket_alloc);
1091	ctxt->output_blen = 0;
1092	ctxt->output_length = 0;
1093
1094	/* Initialize GnuTLS Library */
1095	int err = 0;
1096	if (ctxt->is_proxy == GNUTLS_ENABLED_TRUE)
1097	{
1098	/* this is an outgoing proxy connection, client mode */
1099	err = gnutls_init(&ctxt->session, GNUTLS_CLIENT);
1100	if (err != GNUTLS_E_SUCCESS)
1101	ap_log_cerror(APLOG_MARK, APLOG_ERR, err, c,
1102	"gnutls_init for proxy connection failed: %s (%d)",
1103	gnutls_strerror(err), err);
1104	}
1105	else
1106	{
1107	/* incoming connection, server mode */
1108	err = gnutls_init(&ctxt->session, GNUTLS_SERVER);
1109	if (err != GNUTLS_E_SUCCESS)
1110	ap_log_cerror(APLOG_MARK, APLOG_ERR, err, c,
1111	"gnutls_init for server side failed: %s (%d)",
1112	gnutls_strerror(err), err);
1113	}
1114
1115	/* Ensure TLS session resources are released when the connection
1116	* pool is cleared, if the filters haven't done that already. */
1117	apr_pool_pre_cleanup_register(c->pool, ctxt, cleanup_gnutls_session);
1118
1119	/* Set Default Priority */
1120	err = gnutls_priority_set(ctxt->session, default_prio);
1121	if (err != GNUTLS_E_SUCCESS)
1122	ap_log_cerror(APLOG_MARK, APLOG_ERR, err, c,
1123	"gnutls_priority_set failed!");
1124	/* Set Handshake function */
1125	gnutls_handshake_set_post_client_hello_function(ctxt->session,
1126	mgs_select_virtual_server_cb);
1127
1128	/* Set GnuTLS user pointer, so we can access the module session
1129	* context in GnuTLS callbacks */
1130	gnutls_session_set_ptr(ctxt->session, ctxt);
1131
1132	/* If mod_gnutls is the TLS server, mgs_select_virtual_server_cb
1133	* will load appropriate credentials during handshake. However,
1134	* when handling a proxy backend connection, mod_gnutls acts as
1135	* TLS client and credentials must be loaded here. */
1136	if (ctxt->is_proxy == GNUTLS_ENABLED_TRUE)
1137	{
1138	/* Set anonymous client credentials for proxy connections */
1139	gnutls_credentials_set(ctxt->session, GNUTLS_CRD_ANON,
1140	ctxt->sc->anon_client_creds);
1141	/* Set x509 credentials */
1142	gnutls_credentials_set(ctxt->session, GNUTLS_CRD_CERTIFICATE,
1143	ctxt->sc->proxy_x509_creds);
1144	/* Load priorities from the server configuration */
1145	err = gnutls_priority_set(ctxt->session, ctxt->sc->proxy_priorities);
1146	if (err != GNUTLS_E_SUCCESS)
1147	ap_log_cerror(APLOG_MARK, APLOG_ERR, err, c,
1148	"%s: setting priorities for proxy connection "
1149	"failed: %s (%d)",
1150	__func__, gnutls_strerror(err), err);
1151	}
1152
1153	prepare_alpn_proposals(ctxt);
1154
1155	/* Initialize Session Cache */
1156	mgs_cache_session_init(ctxt);
1157
1158	/* Set pull, push & ptr functions */
1159	gnutls_transport_set_pull_function(ctxt->session,
1160	mgs_transport_read);
1161	gnutls_transport_set_push_function(ctxt->session,
1162	mgs_transport_write);
1163	gnutls_transport_set_ptr(ctxt->session, ctxt);
1164	/* Add IO filters */
1165	ctxt->input_filter = ap_add_input_filter(GNUTLS_INPUT_FILTER_NAME,
1166	ctxt, NULL, c);
1167	ctxt->output_filter = ap_add_output_filter(GNUTLS_OUTPUT_FILTER_NAME,
1168	ctxt, NULL, c);
1169	}
1170
1171	int mgs_hook_pre_connection(conn_rec * c, void *csd __attribute__((unused)))
1172	{
1173	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
1174
1175	if (c->master)
1176	{
1177	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, c,
1178	"%s declined secondary connection", __func__);
1179	return DECLINED;
1180	}
1181
1182	mgs_srvconf_rec sc = (mgs_srvconf_rec )
1183	ap_get_module_config(c->base_server->module_config, &gnutls_module);
1184	mgs_handle_t ctxt = (mgs_handle_t )
1185	ap_get_module_config(c->conn_config, &gnutls_module);
1186
1187	if ((sc && (!sc->enabled))
1188	\|\| (ctxt && ctxt->enabled == GNUTLS_ENABLED_FALSE))
1189	{
1190	ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, "%s declined connection",
1191	__func__);
1192	return DECLINED;
1193	}
1194
1195	create_gnutls_handle(c);
1196	return OK;
1197	}
1198
1199
1200
1201	/**
1202	* process_connection hook: Do a zero byte read to trigger the
1203	* handshake. Doesn't change anything for traditional protocols that
1204	* just do reads, but HTTP/2 needs the TLS handshake and ALPN to
1205	* happen before its process_connection hook runs.
1206	*/
1207	int mgs_hook_process_connection(conn_rec* c)
1208	{
1209	mgs_handle_t ctxt = (mgs_handle_t )
1210	ap_get_module_config(c->conn_config, &gnutls_module);
1211
1212	if ((ctxt != NULL) && (ctxt->enabled == GNUTLS_ENABLED_TRUE))
1213	{
1214	/* This connection is supposed to use TLS. Give the filters a
1215	* kick with a zero byte read to trigger the handshake. */
1216	apr_bucket_brigade* temp =
1217	apr_brigade_create(c->pool, c->bucket_alloc);
1218	ap_get_brigade(c->input_filters, temp,
1219	AP_MODE_INIT, APR_BLOCK_READ, 0);
1220	apr_brigade_destroy(temp);
1221	}
1222	return DECLINED;
1223	}
1224
1225
1226
1227	/* Post request hook, checks if TLS connection and vhost match */
1228	int mgs_req_vhost_check(request_rec *r)
1229	{
1230	/* mod_gnutls server record for the request vhost */
1231	mgs_srvconf_rec r_sc = (mgs_srvconf_rec )
1232	ap_get_module_config(r->server->module_config, &gnutls_module);
1233	mgs_handle_t *ctxt = get_effective_gnutls_ctxt(r->connection);
1234
1235	/* Nothing to check for non-TLS and outgoing proxy connections */
1236	if (ctxt == NULL \|\| !ctxt->enabled \|\| ctxt->is_proxy)
1237	return DECLINED;
1238
1239	if (ctxt->sc != r_sc)
1240	{
1241	ap_log_cerror(APLOG_MARK, APLOG_ERR, APR_SUCCESS, ctxt->c,
1242	"%s: Mismatch between handshake and request servers!",
1243	__func__);
1244	return HTTP_MISDIRECTED_REQUEST;
1245	}
1246
1247	if (!ctxt->sni_name)
1248	return DECLINED;
1249
1250	/* Got an SNI name, so verify it matches. */
1251	ap_log_cerror(APLOG_MARK, APLOG_TRACE1, APR_SUCCESS, ctxt->c,
1252	"%s: Checking request hostname against SNI name '%s'.",
1253	__func__, ctxt->sni_name);
1254
1255	if (!r->hostname)
1256	{
1257	ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, r->connection,
1258	"Client requested '%s' via SNI, but provided "
1259	"no hostname in HTTP request!", ctxt->sni_name);
1260	return HTTP_MISDIRECTED_REQUEST;
1261	}
1262
1263	if (strcasecmp(r->hostname, ctxt->sni_name) != 0)
1264	{
1265	ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, r->connection,
1266	"Client requested '%s' via SNI, but '%s' in "
1267	"the HTTP request!", ctxt->sni_name, r->hostname);
1268	return HTTP_MISDIRECTED_REQUEST;
1269	}
1270
1271	return DECLINED;
1272	}
1273
1274
1275
1276	int mgs_hook_fixups(request_rec * r) {
1277	unsigned char sbuf[GNUTLS_MAX_SESSION_ID];
1278	const char *tmp;
1279	size_t len;
1280	mgs_handle_t *ctxt;
1281	int rv = OK;
1282
1283	if (r == NULL)
1284	return DECLINED;
1285
1286	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
1287	apr_table_t *env = r->subprocess_env;
1288
1289	ctxt = get_effective_gnutls_ctxt(r->connection);
1290
1291	if (!ctxt \|\| ctxt->enabled != GNUTLS_ENABLED_TRUE \|\| ctxt->session == NULL)
1292	{
1293	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "request declined in %s", __func__);
1294	return DECLINED;
1295	}
1296
1297	apr_table_setn(env, "HTTPS", "on");
1298
1299	apr_table_setn(env, "SSL_VERSION_LIBRARY",
1300	"GnuTLS/" LIBGNUTLS_VERSION);
1301	apr_table_setn(env, "SSL_VERSION_INTERFACE",
1302	"mod_gnutls/" MOD_GNUTLS_VERSION);
1303
1304	apr_table_setn(env, "SSL_PROTOCOL",
1305	gnutls_protocol_get_name(gnutls_protocol_get_version(ctxt->session)));
1306
1307	/* should have been called SSL_CIPHERSUITE instead */
1308	apr_table_setn(env, "SSL_CIPHER",
1309	gnutls_cipher_suite_get_name(gnutls_kx_get(ctxt->session),
1310	gnutls_cipher_get(ctxt->session),
1311	gnutls_mac_get(ctxt->session)));
1312
1313	#if GNUTLS_VERSION_NUMBER >= 0x030600
1314	/* Compression support has been removed since GnuTLS 3.6.0 */
1315	apr_table_setn(env, "SSL_COMPRESS_METHOD", "NULL");
1316	#else
1317	apr_table_setn(env, "SSL_COMPRESS_METHOD",
1318	gnutls_compression_get_name(gnutls_compression_get(ctxt->session)));
1319	#endif
1320
1321	#ifdef ENABLE_SRP
1322	if (ctxt->sc->srp_tpasswd_conf_file != NULL && ctxt->sc->srp_tpasswd_file != NULL) {
1323	tmp = gnutls_srp_server_get_username(ctxt->session);
1324	apr_table_setn(env, "SSL_SRP_USER", (tmp != NULL) ? tmp : "");
1325	} else {
1326	apr_table_unset(env, "SSL_SRP_USER");
1327	}
1328	#endif
1329
1330	if (apr_table_get(env, "SSL_CLIENT_VERIFY") == NULL)
1331	apr_table_setn(env, "SSL_CLIENT_VERIFY", "NONE");
1332
1333	unsigned int key_size = 8 * gnutls_cipher_get_key_size(gnutls_cipher_get(ctxt->session));
1334	tmp = apr_psprintf(r->pool, "%u", key_size);
1335
1336	apr_table_setn(env, "SSL_CIPHER_USEKEYSIZE", tmp);
1337
1338	apr_table_setn(env, "SSL_CIPHER_ALGKEYSIZE", tmp);
1339
1340	apr_table_setn(env, "SSL_CIPHER_EXPORT",
1341	(key_size <= 40) ? "true" : "false");
1342
1343	int dhsize = gnutls_dh_get_prime_bits(ctxt->session);
1344	if (dhsize > 0) {
1345	tmp = apr_psprintf(r->pool, "%d", dhsize);
1346	apr_table_setn(env, "SSL_DH_PRIME_BITS", tmp);
1347	}
1348
1349	len = sizeof (sbuf);
1350	gnutls_session_get_id(ctxt->session, sbuf, &len);
1351	apr_table_setn(env, "SSL_SESSION_ID",
1352	apr_pescape_hex(r->pool, sbuf, len, 0));
1353
1354	if (gnutls_certificate_type_get(ctxt->session) == GNUTLS_CRT_X509) {
1355	mgs_add_common_cert_vars(r, ctxt->sc->certs_x509_crt_chain[0], 0,
1356	ctxt->sc->export_certificates_size);
1357	}
1358
1359	return rv;
1360	}
1361
1362	int mgs_hook_authz(request_rec * r) {
1363	int rv;
1364	mgs_handle_t *ctxt;
1365	mgs_dirconf_rec *dc;
1366
1367	if (r == NULL)
1368	return DECLINED;
1369
1370	dc = ap_get_module_config(r->per_dir_config, &gnutls_module);
1371
1372	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
1373	ctxt = get_effective_gnutls_ctxt(r->connection);
1374
1375	if (!ctxt \|\| ctxt->session == NULL) {
1376	return DECLINED;
1377	}
1378
1379	if (dc->client_verify_mode == GNUTLS_CERT_IGNORE) {
1380	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1381	"GnuTLS: Directory set to Ignore Client Certificate!");
1382	} else {
1383	if (ctxt->sc->client_verify_mode < dc->client_verify_mode) {
1384	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1385	"GnuTLS: Attempting to rehandshake with peer. %d %d",
1386	ctxt->sc->client_verify_mode,
1387	dc->client_verify_mode);
1388
1389	/* If we already have a client certificate, there's no point in
1390	* re-handshaking... */
1391	rv = mgs_cert_verify(r, ctxt);
1392	if (rv != DECLINED && rv != HTTP_FORBIDDEN)
1393	return rv;
1394
1395	gnutls_certificate_server_set_request
1396	(ctxt->session, dc->client_verify_mode);
1397
1398	if (mgs_rehandshake(ctxt) != 0) {
1399	return HTTP_FORBIDDEN;
1400	}
1401	} else if (ctxt->sc->client_verify_mode ==
1402	GNUTLS_CERT_IGNORE) {
1403	#if MOD_GNUTLS_DEBUG
1404	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1405	"GnuTLS: Peer is set to IGNORE");
1406	#endif
1407	return DECLINED;
1408	}
1409	rv = mgs_cert_verify(r, ctxt);
1410	if (rv != DECLINED
1411	&& (rv != HTTP_FORBIDDEN
1412	\|\| dc->client_verify_mode == GNUTLS_CERT_REQUIRE
1413	\|\| (dc->client_verify_mode == -1
1414	&& ctxt->sc->client_verify_mode == GNUTLS_CERT_REQUIRE)))
1415	{
1416	return rv;
1417	}
1418	}
1419
1420	return DECLINED;
1421	}
1422
1423	/* variables that are not sent by default:
1424	*
1425	* SSL_CLIENT_CERT string PEM-encoded client certificate
1426	* SSL_SERVER_CERT string PEM-encoded client certificate
1427	*/
1428
1429	/* @param side is either 0 for SERVER or 1 for CLIENT
1430	*
1431	* @param export_cert_size (int) maximum size for environment variable
1432	* to use for the PEM-encoded certificate (0 means do not export)
1433	*/
1434	#define MGS_SIDE(suffix) ((side==0) ? "SSL_SERVER" suffix : "SSL_CLIENT" suffix)
1435
1436	static void mgs_add_common_cert_vars(request_rec * r, gnutls_x509_crt_t cert, int side, size_t export_cert_size) {
1437	unsigned char sbuf[64]; /* buffer to hold serials */
1438	char buf[AP_IOBUFSIZE];
1439	const char *tmp;
1440	char *tmp2;
1441	size_t len;
1442	int ret;
1443
1444	if (r == NULL)
1445	return;
1446
1447	apr_table_t *env = r->subprocess_env;
1448
1449	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
1450	if (export_cert_size > 0) {
1451	len = 0;
1452	ret = gnutls_x509_crt_export(cert, GNUTLS_X509_FMT_PEM, NULL, &len);
1453	if (ret == GNUTLS_E_SHORT_MEMORY_BUFFER) {
1454	if (len >= export_cert_size) {
1455	apr_table_setn(env, MGS_SIDE("_CERT"), "GNUTLS_CERTIFICATE_SIZE_LIMIT_EXCEEDED");
1456	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1457	"GnuTLS: Failed to export too-large X.509 certificate to environment");
1458	} else {
1459	char* cert_buf = apr_palloc(r->pool, len + 1);
1460	if (cert_buf != NULL && gnutls_x509_crt_export(cert, GNUTLS_X509_FMT_PEM, cert_buf, &len) >= 0) {
1461	cert_buf[len] = 0;
1462	apr_table_setn(env, MGS_SIDE("_CERT"), cert_buf);
1463	} else {
1464	ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r,
1465	"GnuTLS: failed to export X.509 certificate");
1466	}
1467	}
1468	} else {
1469	ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r,
1470	"GnuTLS: dazed and confused about X.509 certificate size");
1471	}
1472	}
1473
1474	len = sizeof (buf);
1475	gnutls_x509_crt_get_dn(cert, buf, &len);
1476	apr_table_setn(env, MGS_SIDE("_S_DN"), apr_pstrmemdup(r->pool, buf, len));
1477
1478	len = sizeof (buf);
1479	gnutls_x509_crt_get_issuer_dn(cert, buf, &len);
1480	apr_table_setn(env, MGS_SIDE("_I_DN"), apr_pstrmemdup(r->pool, buf, len));
1481
1482	len = sizeof (sbuf);
1483	gnutls_x509_crt_get_serial(cert, sbuf, &len);
1484	apr_table_setn(env, MGS_SIDE("_M_SERIAL"),
1485	apr_pescape_hex(r->pool, sbuf, len, 0));
1486
1487	ret = gnutls_x509_crt_get_version(cert);
1488	if (ret > 0)
1489	apr_table_setn(env, MGS_SIDE("_M_VERSION"),
1490	apr_psprintf(r->pool, "%u", ret));
1491
1492	apr_table_setn(env, MGS_SIDE("_CERT_TYPE"), "X.509");
1493
1494	tmp =
1495	mgs_time2sz(gnutls_x509_crt_get_expiration_time
1496	(cert), buf, sizeof (buf));
1497	apr_table_setn(env, MGS_SIDE("_V_END"), apr_pstrdup(r->pool, tmp));
1498
1499	tmp =
1500	mgs_time2sz(gnutls_x509_crt_get_activation_time
1501	(cert), buf, sizeof (buf));
1502	apr_table_setn(env, MGS_SIDE("_V_START"), apr_pstrdup(r->pool, tmp));
1503
1504	ret = gnutls_x509_crt_get_signature_algorithm(cert);
1505	if (ret >= 0) {
1506	apr_table_setn(env, MGS_SIDE("_A_SIG"),
1507	gnutls_sign_algorithm_get_name(ret));
1508	}
1509
1510	ret = gnutls_x509_crt_get_pk_algorithm(cert, NULL);
1511	if (ret >= 0) {
1512	apr_table_setn(env, MGS_SIDE("_A_KEY"),
1513	gnutls_pk_algorithm_get_name(ret));
1514	}
1515
1516	/* export all the alternative names (DNS, RFC822 and URI) */
1517	for (int i = 0; !(ret < 0); i++)
1518	{
1519	const char san, sanlabel;
1520	len = 0;
1521	ret = gnutls_x509_crt_get_subject_alt_name(cert, i,
1522	NULL, &len,
1523	NULL);
1524
1525	if (ret == GNUTLS_E_SHORT_MEMORY_BUFFER && len > 1) {
1526	tmp2 = apr_palloc(r->pool, len + 1);
1527
1528	ret =
1529	gnutls_x509_crt_get_subject_alt_name(cert, i,
1530	tmp2,
1531	&len,
1532	NULL);
1533	tmp2[len] = 0;
1534
1535	sanlabel = apr_psprintf(r->pool, "%s%u", MGS_SIDE("_S_AN"), i);
1536	if (ret == GNUTLS_SAN_DNSNAME) {
1537	san = apr_psprintf(r->pool, "DNSNAME:%s", tmp2);
1538	} else if (ret == GNUTLS_SAN_RFC822NAME) {
1539	san = apr_psprintf(r->pool, "RFC822NAME:%s", tmp2);
1540	} else if (ret == GNUTLS_SAN_URI) {
1541	san = apr_psprintf(r->pool, "URI:%s", tmp2);
1542	} else {
1543	san = "UNSUPPORTED";
1544	}
1545	apr_table_setn(env, sanlabel, san);
1546	}
1547	}
1548	}
1549
1550
1551
1552	/* TODO: Allow client sending a X.509 certificate chain */
1553	static int mgs_cert_verify(request_rec * r, mgs_handle_t * ctxt) {
1554	const gnutls_datum_t *cert_list;
1555	unsigned int cert_list_size;
1556	/* assume the certificate is invalid unless explicitly set
1557	* otherwise */
1558	unsigned int status = GNUTLS_CERT_INVALID;
1559	int rv = GNUTLS_E_NO_CERTIFICATE_FOUND, ret;
1560	unsigned int ch_size = 0;
1561
1562	// TODO: union no longer needed here after removing its "pgp" component.
1563	union {
1564	gnutls_x509_crt_t x509[MAX_CHAIN_SIZE];
1565	} cert;
1566	apr_time_t expiration_time, cur_time;
1567
1568	if (r == NULL \|\| ctxt == NULL \|\| ctxt->session == NULL)
1569	return HTTP_FORBIDDEN;
1570
1571	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
1572	cert_list =
1573	gnutls_certificate_get_peers(ctxt->session, &cert_list_size);
1574
1575	if (cert_list == NULL \|\| cert_list_size == 0) {
1576	/* It is perfectly OK for a client not to send a certificate if on REQUEST mode
1577	*/
1578	if (ctxt->sc->client_verify_mode == GNUTLS_CERT_REQUEST)
1579	return OK;
1580
1581	/* no certificate provided by the client, but one was required. */
1582	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1583	"GnuTLS: Failed to Verify Peer: "
1584	"Client did not submit a certificate");
1585	return HTTP_FORBIDDEN;
1586	}
1587
1588	if (gnutls_certificate_type_get(ctxt->session) == GNUTLS_CRT_X509) {
1589	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1590	"GnuTLS: A Chain of %d certificate(s) was provided for validation",
1591	cert_list_size);
1592
1593	for (ch_size = 0; ch_size < cert_list_size; ch_size++) {
1594	gnutls_x509_crt_init(&cert.x509[ch_size]);
1595	rv = gnutls_x509_crt_import(cert.x509[ch_size],
1596	&cert_list[ch_size],
1597	GNUTLS_X509_FMT_DER);
1598	// When failure to import, leave the loop
1599	if (rv != GNUTLS_E_SUCCESS) {
1600	if (ch_size < 1) {
1601	ap_log_rerror(APLOG_MARK,
1602	APLOG_INFO, 0, r,
1603	"GnuTLS: Failed to Verify Peer: "
1604	"Failed to import peer certificates.");
1605	ret = HTTP_FORBIDDEN;
1606	goto exit;
1607	}
1608	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1609	"GnuTLS: Failed to import some peer certificates. Using %d certificates",
1610	ch_size);
1611	rv = GNUTLS_E_SUCCESS;
1612	break;
1613	}
1614	}
1615	} else
1616	return HTTP_FORBIDDEN;
1617
1618	if (rv < 0) {
1619	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1620	"GnuTLS: Failed to Verify Peer: "
1621	"Failed to import peer certificates.");
1622	ret = HTTP_FORBIDDEN;
1623	goto exit;
1624	}
1625
1626	if (gnutls_certificate_type_get(ctxt->session) == GNUTLS_CRT_X509) {
1627	apr_time_ansi_put(&expiration_time,
1628	gnutls_x509_crt_get_expiration_time
1629	(cert.x509[0]));
1630
1631	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1632	"GnuTLS: Verifying list of %d certificate(s) via method '%s'",
1633	ch_size, mgs_readable_cvm(ctxt->sc->client_verify_method));
1634	switch(ctxt->sc->client_verify_method) {
1635	case mgs_cvm_cartel:
1636	rv = gnutls_x509_crt_list_verify(cert.x509, ch_size,
1637	ctxt->sc->ca_list,
1638	ctxt->sc->ca_list_size,
1639	NULL, 0, 0, &status);
1640	break;
1641	#ifdef ENABLE_MSVA
1642	case mgs_cvm_msva:
1643	{
1644	struct msv_response* resp = NULL;
1645	struct msv_query q = { .context="https", .peertype="client", .pkctype="x509pem" };
1646	msv_ctxt_t ctx = msv_ctxt_init(NULL);
1647	char cert_pem_buf[10 * 1024];
1648	size_t len = sizeof (cert_pem_buf);
1649
1650	rv = 0;
1651	if (gnutls_x509_crt_export(cert.x509[0], GNUTLS_X509_FMT_PEM, cert_pem_buf, &len) >= 0) {
1652	/* FIXME : put together a name from the cert we received, instead of hard-coding this value: */
1653	q.peername = mgs_x509_construct_uid(r, cert.x509[0]);
1654	q.pkcdata = cert_pem_buf;
1655	rv = msv_query_agent(ctx, q, &resp);
1656	if (rv == LIBMSV_ERROR_SUCCESS) {
1657	status = 0;
1658	} else if (rv == LIBMSV_ERROR_INVALID) {
1659	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1660	"GnuTLS: Monkeysphere validation failed: (message: %s)", resp->message);
1661	status = GNUTLS_CERT_INVALID;
1662	} else {
1663	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1664	"GnuTLS: Error communicating with the Monkeysphere Validation Agent: (%d) %s", rv, msv_strerror(ctx, rv));
1665	status = GNUTLS_CERT_INVALID;
1666	rv = -1;
1667	}
1668	} else {
1669	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1670	"GnuTLS: Could not convert the client certificate to PEM format");
1671	status = GNUTLS_CERT_INVALID;
1672	rv = GNUTLS_E_ASN1_ELEMENT_NOT_FOUND;
1673	}
1674	msv_response_destroy(resp);
1675	msv_ctxt_destroy(ctx);
1676	}
1677	break;
1678	#endif
1679	default:
1680	/* If this block is reached, that indicates a
1681	* configuration error or bug in mod_gnutls (invalid value
1682	* of ctxt->sc->client_verify_method). */
1683	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1684	"GnuTLS: Failed to Verify X.509 Peer: method '%s' is not supported",
1685	mgs_readable_cvm(ctxt->sc->client_verify_method));
1686	rv = GNUTLS_E_UNIMPLEMENTED_FEATURE;
1687	}
1688
1689	} else {
1690	/* Unknown certificate type */
1691	rv = GNUTLS_E_UNIMPLEMENTED_FEATURE;
1692	}
1693
1694	/* "goto exit" at the end of this block skips evaluation of the
1695	* "status" variable */
1696	if (rv < 0) {
1697	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1698	"GnuTLS: Failed to Verify Peer certificate: (%d) %s",
1699	rv, gnutls_strerror(rv));
1700	if (rv == GNUTLS_E_NO_CERTIFICATE_FOUND)
1701	ap_log_rerror(APLOG_MARK, APLOG_EMERG, 0, r,
1702	"GnuTLS: No certificate was found for verification. Did you set the GnuTLSClientCAFile directive?");
1703	ret = HTTP_FORBIDDEN;
1704	goto exit;
1705	}
1706
1707	/* TODO: X509 CRL Verification. */
1708	/* May add later if anyone needs it.
1709	*/
1710	/* ret = gnutls_x509_crt_check_revocation(crt, crl_list, crl_list_size); */
1711
1712	cur_time = apr_time_now();
1713
1714	if (status & GNUTLS_CERT_SIGNER_NOT_FOUND) {
1715	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1716	"GnuTLS: Could not find Signer for Peer Certificate");
1717	}
1718
1719	if (status & GNUTLS_CERT_SIGNER_NOT_CA) {
1720	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1721	"GnuTLS: Peer's Certificate signer is not a CA");
1722	}
1723
1724	if (status & GNUTLS_CERT_INSECURE_ALGORITHM) {
1725	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1726	"GnuTLS: Peer's Certificate is using insecure algorithms");
1727	}
1728
1729	if (status & GNUTLS_CERT_EXPIRED
1730	\|\| status & GNUTLS_CERT_NOT_ACTIVATED) {
1731	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1732	"GnuTLS: Peer's Certificate signer is expired or not yet activated");
1733	}
1734
1735	if (status & GNUTLS_CERT_INVALID) {
1736	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1737	"GnuTLS: Peer Certificate is invalid.");
1738	} else if (status & GNUTLS_CERT_REVOKED) {
1739	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1740	"GnuTLS: Peer Certificate is revoked.");
1741	}
1742
1743	mgs_add_common_cert_vars(r, cert.x509[0], 1, ctxt->sc->export_certificates_size);
1744
1745	{
1746	/* days remaining */
1747	unsigned long remain =
1748	(apr_time_sec(expiration_time) -
1749	apr_time_sec(cur_time)) / 86400;
1750	apr_table_setn(r->subprocess_env, "SSL_CLIENT_V_REMAIN",
1751	apr_psprintf(r->pool, "%lu", remain));
1752	}
1753
1754	if (status == 0) {
1755	apr_table_setn(r->subprocess_env, "SSL_CLIENT_VERIFY",
1756	"SUCCESS");
1757	ret = OK;
1758	} else {
1759	apr_table_setn(r->subprocess_env, "SSL_CLIENT_VERIFY",
1760	"FAILED");
1761	if (ctxt->sc->client_verify_mode == GNUTLS_CERT_REQUEST)
1762	ret = OK;
1763	else
1764	ret = HTTP_FORBIDDEN;
1765	}
1766
1767	exit:
1768	if (gnutls_certificate_type_get(ctxt->session) == GNUTLS_CRT_X509)
1769	for (unsigned int i = 0; i < ch_size; i++)
1770	gnutls_x509_crt_deinit(cert.x509[i]);
1771
1772	return ret;
1773	}
1774
1775
1776
1777	#ifdef ENABLE_MSVA
1778	/* this section of code is used only when trying to talk to the MSVA */
1779	static const char* mgs_x509_leaf_oid_from_dn(apr_pool_t pool, const char oid, gnutls_x509_crt_t cert) {
1780	int rv=GNUTLS_E_SUCCESS, i;
1781	size_t sz=0, lastsz=0;
1782	char* data=NULL;
1783
1784	i = -1;
1785	while(rv != GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
1786	i++;
1787	lastsz=sz;
1788	sz=0;
1789	rv = gnutls_x509_crt_get_dn_by_oid (cert, oid, i, 0, NULL, &sz);
1790	}
1791	if (i > 0) {
1792	data = apr_palloc(pool, lastsz);
1793	sz=lastsz;
1794	rv = gnutls_x509_crt_get_dn_by_oid (cert, oid, i-1, 0, data, &sz);
1795	if (rv == GNUTLS_E_SUCCESS)
1796	return data;
1797	}
1798	return NULL;
1799	}
1800
1801	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) {
1802	int rv=GNUTLS_E_SUCCESS;
1803	size_t sz;
1804	char* data=NULL;
1805	unsigned int i;
1806	gnutls_x509_subject_alt_name_t thistype;
1807
1808	i = 0;
1809	while(rv != GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
1810	sz = 0;
1811	rv = gnutls_x509_crt_get_subject_alt_name2(cert, i, NULL, &sz, &thistype, NULL);
1812	if (rv == GNUTLS_E_SHORT_MEMORY_BUFFER && thistype == target) {
1813	data = apr_palloc(pool, sz);
1814	rv = gnutls_x509_crt_get_subject_alt_name2(cert, i, data, &sz, &thistype, NULL);
1815	if (rv >=0 && (thistype == target))
1816	return data;
1817	}
1818	i++;
1819	}
1820	return NULL;
1821	}
1822
1823
1824	/* Create a string representing a candidate User ID from an X.509
1825	* certificate
1826
1827	* We need this for client certification because a client gives us a
1828	* certificate, but doesn't tell us (in any other way) who they are
1829	* trying to authenticate as.
1830
1831	* one complaint might be "but the user wanted to be another identity,
1832	* which is also in the certificate (e.g. in a SubjectAltName)"
1833	* However, given that any user can regenerate their own X.509
1834	* certificate with their own public key content, they should just do
1835	* so, and not expect us to guess at their identity :)
1836
1837	* This function allocates it's response from the pool given it. When
1838	* that pool is reclaimed, the response will also be deallocated.
1839
1840	* FIXME: what about extracting a server-style cert
1841	* (e.g. https://imposter.example) from the DN or any sAN?
1842
1843	* FIXME: what if we want to call this outside the context of a
1844	* request? That complicates the logging.
1845	*/
1846	static const char* mgs_x509_construct_uid(request_rec *r, gnutls_x509_crt_t cert) {
1847	/* basic strategy, assuming humans are the users: we are going to
1848	* try to reconstruct a "conventional" User ID by pulling in a
1849	* name, comment, and e-mail address.
1850	*/
1851	apr_pool_t *pool = r->pool;
1852	const char name=NULL, comment=NULL, *email=NULL;
1853	const char *ret=NULL;
1854	/* subpool for temporary allocation: */
1855	apr_pool_t *sp=NULL;
1856
1857	if (APR_SUCCESS != apr_pool_create(&sp, pool))
1858	return NULL; /* i'm assuming that libapr would log this kind
1859	* of error on its own */
1860
1861	/* Name
1862
1863	the name comes from the leaf commonName of the cert's Subject.
1864
1865	(MAYBE: should we look at trying to assemble a candidate from
1866	givenName, surName, suffix, etc? the "name" field
1867	appears to be case-insensitive, which seems problematic
1868	from what we expect; see:
1869	http://www.itu.int/rec/T-REC-X.520-200102-s/e )
1870
1871	(MAYBE: should we try pulling a commonName or otherName or
1872	something from subjectAltName? see:
1873	https://tools.ietf.org/html/rfc5280#section-4.2.1.6
1874	GnuTLS does not support looking for Common Names in the
1875	SAN yet)
1876	*/
1877	name = mgs_x509_leaf_oid_from_dn(sp, GNUTLS_OID_X520_COMMON_NAME, cert);
1878
1879	/* Comment
1880
1881	I am inclined to punt on this for now, as Comment has been so
1882	atrociously misused in OpenPGP. Perhaps if there is a
1883	pseudonym (OID 2.5.4.65, aka GNUTLS_OID_X520_PSEUDONYM) field
1884	in the subject or sAN?
1885	*/
1886	comment = mgs_x509_leaf_oid_from_dn(sp, GNUTLS_OID_X520_PSEUDONYM, cert);
1887
1888	/* E-mail
1889
1890	This should be the the first rfc822Name from the sAN.
1891
1892	failing that, we'll take the leaf email in the certificate's
1893	subject; this is a deprecated use though.
1894	*/
1895	email = mgs_x509_first_type_from_san(sp, GNUTLS_SAN_RFC822NAME, cert);
1896	if (email == NULL)
1897	email = mgs_x509_leaf_oid_from_dn(sp, GNUTLS_OID_PKCS9_EMAIL, cert);
1898
1899	/* assemble all the parts: */
1900
1901	/* must have at least a name or an e-mail. */
1902	if (name == NULL && email == NULL) {
1903	ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1904	"GnuTLS: Need either a name or an e-mail address to get a User ID from an X.509 certificate.");
1905	goto end;
1906	}
1907	if (name) {
1908	if (comment) {
1909	if (email) {
1910	ret = apr_psprintf(pool, "%s (%s) <%s>", name, comment, email);
1911	} else {
1912	ret = apr_psprintf(pool, "%s (%s)", name, comment);
1913	}
1914	} else {
1915	if (email) {
1916	ret = apr_psprintf(pool, "%s <%s>", name, email);
1917	} else {
1918	ret = apr_pstrdup(pool, name);
1919	}
1920	}
1921	} else {
1922	if (comment) {
1923	ret = apr_psprintf(pool, "(%s) <%s>", comment, email);
1924	} else {
1925	ret = apr_psprintf(pool, "<%s>", email);
1926	}
1927	}
1928
1929	end:
1930	apr_pool_destroy(sp);
1931	return ret;
1932	}
1933	#endif /* ENABLE_MSVA */
1934
1935
1936
1937	/*
1938	* This hook writes the mod_gnutls status message for a mod_status
1939	* report. According to the comments in mod_status.h, the "flags"
1940	* parameter is a bitwise OR of the AP_STATUS_ flags.
1941	*
1942	* Note that this implementation gives flags explicitly requesting a
1943	* simple response priority, e.g. if AP_STATUS_SHORT is set, flags
1944	* requesting an HTML report will be ignored. As of Apache 2.4.10, the
1945	* following flags were defined in mod_status.h:
1946	*
1947	* AP_STATUS_SHORT (short, non-HTML report requested)
1948	* AP_STATUS_NOTABLE (HTML report without tables)
1949	* AP_STATUS_EXTENDED (detailed report)
1950	*/
1951	static int mgs_status_hook(request_rec *r, int flags)
1952	{
1953	if (r == NULL)
1954	return OK;
1955
1956	mgs_srvconf_rec sc = (mgs_srvconf_rec )
1957	ap_get_module_config(r->server->module_config, &gnutls_module);
1958
1959	_gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
1960
1961	if (flags & AP_STATUS_SHORT)
1962	{
1963	ap_rprintf(r, "Using GnuTLS version: %s\n", gnutls_check_version(NULL));
1964	ap_rputs("Built against GnuTLS version: " GNUTLS_VERSION "\n", r);
1965	}
1966	else
1967	{
1968	ap_rputs("<hr>\n", r);
1969	ap_rputs("<h2>GnuTLS Information:</h2>\n<dl>\n", r);
1970
1971	ap_rprintf(r, "<dt>Using GnuTLS version:</dt><dd>%s</dd>\n",
1972	gnutls_check_version(NULL));
1973	ap_rputs("<dt>Built against GnuTLS version:</dt><dd>"
1974	GNUTLS_VERSION "</dd>\n", r);
1975	ap_rprintf(r, "<dt>Using TLS:</dt><dd>%s</dd>\n",
1976	(sc->enabled == GNUTLS_ENABLED_FALSE ? "no" : "yes"));
1977	}
1978
1979	if (sc->enabled != GNUTLS_ENABLED_FALSE)
1980	{
1981	mgs_handle_t* ctxt = get_effective_gnutls_ctxt(r->connection);
1982	if (ctxt && ctxt->session != NULL)
1983	{
1984	char* s_info = gnutls_session_get_desc(ctxt->session);
1985	if (s_info)
1986	{
1987	if (flags & AP_STATUS_SHORT)
1988	ap_rprintf(r, "Current TLS session: %s\n", s_info);
1989	else
1990	ap_rprintf(r, "<dt>Current TLS session:</dt><dd>%s</dd>\n",
1991	s_info);
1992	gnutls_free(s_info);
1993	}
1994	}
1995	}
1996
1997	if (!(flags & AP_STATUS_SHORT))
1998	ap_rputs("</dl>\n", r);
1999
2000	if (sc->ocsp_cache)
2001	mgs_cache_status(sc->ocsp_cache, "GnuTLS OCSP Cache", r, flags);
2002	if (sc->cache_enable)
2003	mgs_cache_status(sc->cache, "GnuTLS Session Cache", r, flags);
2004
2005	return OK;
2006	}
2007
2008
2009
2010	/*
2011	* Callback to check the server certificate for proxy HTTPS
2012	* connections, to be used with
2013	* gnutls_certificate_set_verify_function.
2014
2015	* Returns: 0 if certificate check was successful (certificate
2016	* trusted), non-zero otherwise (error during check or untrusted
2017	* certificate).
2018	*/
2019	static int gtls_check_server_cert(gnutls_session_t session)
2020	{
2021	mgs_handle_t ctxt = (mgs_handle_t ) gnutls_session_get_ptr(session);
2022	unsigned int status;
2023
2024	/* Get peer hostname from a note left by mod_proxy */
2025	const char *peer_hostname =
2026	apr_table_get(ctxt->c->notes, PROXY_SNI_NOTE);
2027	if (peer_hostname == NULL)
2028	ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, ctxt->c,
2029	"%s: " PROXY_SNI_NOTE " NULL, cannot check "
2030	"peer's hostname", __func__);
2031
2032	/* Verify certificate, including hostname match. Should
2033	* peer_hostname be NULL for some reason, the name is not
2034	* checked. */
2035	int err = gnutls_certificate_verify_peers3(session, peer_hostname,
2036	&status);
2037	if (err != GNUTLS_E_SUCCESS)
2038	{
2039	ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, ctxt->c,
2040	"%s: server certificate check failed: %s (%d)",
2041	__func__, gnutls_strerror(err), err);
2042	return err;
2043	}
2044
2045	if (status == 0)
2046	ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, ctxt->c,
2047	"%s: server certificate is trusted.",
2048	__func__);
2049	else
2050	{
2051	gnutls_datum_t out;
2052	/* GNUTLS_CRT_X509: ATM, only X509 is supported for proxy
2053	* certs 0: according to function API, the last argument
2054	* should be 0 */
2055	err = gnutls_certificate_verification_status_print(status,
2056	GNUTLS_CRT_X509,
2057	&out, 0);
2058	if (err != GNUTLS_E_SUCCESS)
2059	ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, ctxt->c,
2060	"%s: server verify print failed: %s (%d)",
2061	__func__, gnutls_strerror(err), err);
2062	else
2063	ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, ctxt->c,
2064	"%s: %s",
2065	__func__, out.data);
2066	gnutls_free(out.data);
2067	}
2068
2069	return status;
2070	}
2071
2072
2073
2074	static apr_status_t cleanup_proxy_x509_credentials(void *arg)
2075	{
2076	mgs_srvconf_rec sc = (mgs_srvconf_rec ) arg;
2077
2078	if (sc->proxy_x509_creds)
2079	{
2080	/* This implicitly releases the associated trust list
2081	* sc->proxy_x509_tl, too. */
2082	gnutls_certificate_free_credentials(sc->proxy_x509_creds);
2083	sc->proxy_x509_creds = NULL;
2084	sc->proxy_x509_tl = NULL;
2085	}
2086
2087	if (sc->anon_client_creds)
2088	{
2089	gnutls_anon_free_client_credentials(sc->anon_client_creds);
2090	sc->anon_client_creds = NULL;
2091	}
2092
2093	/* Deinit proxy priorities only if set from
2094	* sc->proxy_priorities_str. Otherwise the server is using the
2095	* default global priority cache, which must not be deinitialized
2096	* here. */
2097	if (sc->proxy_priorities_str && sc->proxy_priorities)
2098	{
2099	gnutls_priority_deinit(sc->proxy_priorities);
2100	sc->proxy_priorities = NULL;
2101	}
2102
2103	return APR_SUCCESS;
2104	}
2105
2106
2107
2108	static apr_status_t load_proxy_x509_credentials(apr_pool_t *pconf,
2109	apr_pool_t *ptemp,
2110	server_rec *s)
2111	{
2112	mgs_srvconf_rec sc = (mgs_srvconf_rec )
2113	ap_get_module_config(s->module_config, &gnutls_module);
2114
2115	if (sc == NULL)
2116	return APR_EGENERAL;
2117
2118	apr_status_t ret = APR_EINIT;
2119	int err = GNUTLS_E_SUCCESS;
2120
2121	/* Cleanup function for the GnuTLS structures allocated below */
2122	apr_pool_cleanup_register(pconf, sc, cleanup_proxy_x509_credentials,
2123	apr_pool_cleanup_null);
2124
2125	/* Function pool, gets destroyed before exit. */
2126	apr_pool_t *pool;
2127	ret = apr_pool_create(&pool, ptemp);
2128	if (ret != APR_SUCCESS)
2129	{
2130	ap_log_error(APLOG_MARK, APLOG_ERR, ret, s,
2131	"%s: failed to allocate function memory pool.", __func__);
2132	return ret;
2133	}
2134
2135	/* allocate credentials structures */
2136	err = gnutls_certificate_allocate_credentials(&sc->proxy_x509_creds);
2137	if (err != GNUTLS_E_SUCCESS)
2138	{
2139	ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
2140	"%s: Failed to initialize proxy credentials: (%d) %s",
2141	__func__, err, gnutls_strerror(err));
2142	return APR_EGENERAL;
2143	}
2144	err = gnutls_anon_allocate_client_credentials(&sc->anon_client_creds);
2145	if (err != GNUTLS_E_SUCCESS)
2146	{
2147	ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
2148	"%s: Failed to initialize anon credentials for proxy: "
2149	"(%d) %s", __func__, err, gnutls_strerror(err));
2150	return APR_EGENERAL;
2151	}
2152
2153	/* Check if the proxy priorities have been set, fail immediately
2154	* if not */
2155	if (sc->proxy_priorities_str == NULL)
2156	{
2157	ap_log_error(APLOG_MARK, APLOG_INFO, 0, s,
2158	"No GnuTLSProxyPriorities directive for host '%s:%d', "
2159	"using default '%s'.",
2160	s->server_hostname, s->addrs->host_port,
2161	MGS_DEFAULT_PRIORITY);
2162	sc->proxy_priorities = default_prio;
2163	}
2164	else
2165	{
2166	/* parse proxy priorities */
2167	const char *err_pos = NULL;
2168	err = gnutls_priority_init(&sc->proxy_priorities,
2169	sc->proxy_priorities_str, &err_pos);
2170	if (err != GNUTLS_E_SUCCESS)
2171	{
2172	if (ret == GNUTLS_E_INVALID_REQUEST)
2173	ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
2174	"%s: Syntax error parsing proxy priorities "
2175	"string at: %s",
2176	__func__, err_pos);
2177	else
2178	ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
2179	"Error setting proxy priorities: %s (%d)",
2180	gnutls_strerror(err), err);
2181	ret = APR_EGENERAL;
2182	}
2183	}
2184
2185	/* load certificate and key for client auth, if configured */
2186	if (sc->proxy_x509_key_file && sc->proxy_x509_cert_file)
2187	{
2188	char* cert_file = ap_server_root_relative(pool,
2189	sc->proxy_x509_cert_file);
2190	char* key_file = ap_server_root_relative(pool,
2191	sc->proxy_x509_key_file);
2192	err = gnutls_certificate_set_x509_key_file(sc->proxy_x509_creds,
2193	cert_file,
2194	key_file,
2195	GNUTLS_X509_FMT_PEM);
2196	if (err != GNUTLS_E_SUCCESS)
2197	{
2198	ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
2199	"%s: loading proxy client credentials failed: %s (%d)",
2200	__func__, gnutls_strerror(err), err);
2201	ret = APR_EGENERAL;
2202	}
2203	}
2204	else if (!sc->proxy_x509_key_file && sc->proxy_x509_cert_file)
2205	{
2206	ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
2207	"%s: proxy key file not set!", __func__);
2208	ret = APR_EGENERAL;
2209	}
2210	else if (!sc->proxy_x509_cert_file && sc->proxy_x509_key_file)
2211	{
2212	ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
2213	"%s: proxy certificate file not set!", __func__);
2214	ret = APR_EGENERAL;
2215	}
2216	else
2217	/* if both key and cert are NULL, client auth is not used */
2218	ap_log_error(APLOG_MARK, APLOG_INFO, 0, s,
2219	"%s: no client credentials for proxy", __func__);
2220
2221	/* must be set if the server certificate is to be checked */
2222	if (sc->proxy_x509_ca_file)
2223	{
2224	/* initialize the trust list */
2225	err = gnutls_x509_trust_list_init(&sc->proxy_x509_tl, 0);
2226	if (err != GNUTLS_E_SUCCESS)
2227	{
2228	ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
2229	"%s: gnutls_x509_trust_list_init failed: %s (%d)",
2230	__func__, gnutls_strerror(err), err);
2231	ret = APR_EGENERAL;
2232	}
2233
2234	char* ca_file = ap_server_root_relative(pool,
2235	sc->proxy_x509_ca_file);
2236	/* if no CRL is used, sc->proxy_x509_crl_file is NULL */
2237	char* crl_file = NULL;
2238	if (sc->proxy_x509_crl_file)
2239	crl_file = ap_server_root_relative(pool,
2240	sc->proxy_x509_crl_file);
2241
2242	/* returns number of loaded elements */
2243	err = gnutls_x509_trust_list_add_trust_file(sc->proxy_x509_tl,
2244	ca_file,
2245	crl_file,
2246	GNUTLS_X509_FMT_PEM,
2247	0 /* tl_flags */,
2248	0 /* tl_vflags */);
2249	if (err > 0)
2250	ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s,
2251	"%s: proxy CA trust list: %d structures loaded",
2252	__func__, err);
2253	else if (err == 0)
2254	ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
2255	"%s: proxy CA trust list is empty (%d)",
2256	__func__, err);
2257	else /* err < 0 */
2258	{
2259	ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
2260	"%s: error loading proxy CA trust list: %s (%d)",
2261	__func__, gnutls_strerror(err), err);
2262	ret = APR_EGENERAL;
2263	}
2264
2265	/* attach trust list to credentials */
2266	gnutls_certificate_set_trust_list(sc->proxy_x509_creds,
2267	sc->proxy_x509_tl, 0);
2268	}
2269	else
2270	ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
2271	"%s: no CA trust list for proxy connections, "
2272	"TLS connections will fail!", __func__);
2273
2274	gnutls_certificate_set_verify_function(sc->proxy_x509_creds,
2275	gtls_check_server_cert);
2276	apr_pool_destroy(pool);
2277	return ret;
2278	}

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