source: mod_gnutls/src/gnutls_hooks.c

asyncio
Last change on this file was d54572e, checked in by Fiona Klute <fiona.klute@…>, 7 months ago

Limit variable scopes in gnutls_hooks.c

This fixes issues found using CppCheck?.

  • Property mode set to 100644
File size: 72.4 KB
RevLine 
[104e881]1/*
[c301152]2 *  Copyright 2004-2005 Paul Querna
[e021722]3 *  Copyright 2008, 2014 Nikos Mavrogiannopoulos
[e183628]4 *  Copyright 2011 Dash Shendy
[765cac2]5 *  Copyright 2013-2014 Daniel Kahn Gillmor
[cf6f974]6 *  Copyright 2015-2020 Fiona Klute
[c301152]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"
[04e6e65]22#include "gnutls_cache.h"
[f52f1b4]23#include "gnutls_config.h"
[05e2d9e]24#include "gnutls_io.h"
[94cb972]25#include "gnutls_ocsp.h"
[68b5156]26#include "gnutls_proxy.h"
[7ff6c6c]27#include "gnutls_sni.h"
[235e109]28#include "gnutls_util.h"
[0e3f8c6]29#include "gnutls_watchdog.h"
30
[c301152]31#include "http_vhost.h"
[84cb5b2]32#include "ap_mpm.h"
[3aff94d]33#include <mod_status.h>
[c005645]34#include <util_mutex.h>
[f450ac9]35#include <apr_escape.h>
[4e388b0]36/* This provides strcmp and related functions */
37#define APR_WANT_STRFUNC
38#include <apr_want.h>
[c301152]39
[33fa7d5]40#include <gnutls/x509-ext.h>
41
[07889ab]42#ifdef ENABLE_MSVA
43#include <msv/msv.h>
44#endif
[0499540]45
[55dc3f0]46#ifdef APLOG_USE_MODULE
47APLOG_USE_MODULE(gnutls);
48#endif
49
[c301152]50#if MOD_GNUTLS_DEBUG
[7bebb42]51static apr_file_t *debug_log_fp;
[c301152]52#endif
53
[b429e4c]54#define IS_PROXY_STR(c) \
55    ((c->is_proxy == GNUTLS_ENABLED_TRUE) ? "proxy " : "")
56
[33fa7d5]57/** Feature number for "must-staple" in the RFC 7633 X.509 TLS Feature
58 * Extension (status_request, defined in RFC 6066) */
59#define TLSFEATURE_MUST_STAPLE 5
60
[346c03b]61/**
62 * Request protocol string for HTTP/2, as hard-coded in mod_http2
63 * h2_request.c.
64 */
65#define HTTP2_PROTOCOL "HTTP/2.0"
66
67/**
68 * mod_http2 checks this note, set it to signal that a request would
69 * require renegotiation/reauth, which isn't allowed under HTTP/2. The
70 * content of the note is expected to be a string giving the reason
71 * renegotiation would be needed.
72 *
73 * See: https://tools.ietf.org/html/rfc7540#section-9.2.1
74 */
75#define RENEGOTIATE_FORBIDDEN_NOTE "ssl-renegotiate-forbidden"
76
[104e881]77/** Key to encrypt session tickets. Must be kept secret. This key is
78 * generated in the `pre_config` hook and thus constant across
79 * forks. The problem with this approach is that it does not support
80 * regular key rotation. */
[b8df283]81static gnutls_datum_t session_ticket_key = {NULL, 0};
[84cb5b2]82
[60868d2]83
84
[7bebb42]85static int mgs_cert_verify(request_rec * r, mgs_handle_t * ctxt);
[c0fc11e]86/** use side==0 for server and side==1 for client */
[fd82e59]87static void mgs_add_common_cert_vars(request_rec * r, gnutls_x509_crt_t cert, int side, size_t export_cert_size);
[c0fc11e]88mgs_srvconf_rec* mgs_find_sni_server(mgs_handle_t *ctxt);
[b4739cd]89static int mgs_status_hook(request_rec *r, int flags);
[fd82e59]90#ifdef ENABLE_MSVA
91static const char* mgs_x509_construct_uid(request_rec * pool, gnutls_x509_crt_t cert);
92#endif
[e183628]93
[3b4c0d0]94/* Pool Cleanup Function */
[87d507b]95apr_status_t mgs_cleanup_pre_config(void *data __attribute__((unused)))
96{
97    /* Free session ticket master key */
98    gnutls_memset(session_ticket_key.data, 0, session_ticket_key.size);
[e183628]99    gnutls_free(session_ticket_key.data);
100    session_ticket_key.data = NULL;
101    session_ticket_key.size = 0;
[60868d2]102
103    /* Deinit default priority setting */
[0fcba60]104    mgs_default_priority_deinit();
[e183628]105    return APR_SUCCESS;
[c301152]106}
107
[3b4c0d0]108/* Logging Function for Maintainers */
[c301152]109#if MOD_GNUTLS_DEBUG
[e183628]110static void gnutls_debug_log_all(int level, const char *str) {
[9ecd212]111    apr_file_printf(debug_log_fp, "<%d> %s", level, str);
[c301152]112}
[a208cd3]113#define _gnutls_log apr_file_printf
114#else
[e183628]115#define _gnutls_log(...)
[c301152]116#endif
117
[07889ab]118static const char* mgs_readable_cvm(mgs_client_verification_method_e m) {
119    switch(m) {
120    case mgs_cvm_unset:
121        return "unset";
122    case mgs_cvm_cartel:
123        return "cartel";
124    case mgs_cvm_msva:
125        return "msva";
126    }
127    return "unknown";
128}
129
[3b4c0d0]130/* Pre-Configuration HOOK: Runs First */
[fd82e59]131int mgs_hook_pre_config(apr_pool_t * pconf, apr_pool_t * plog, apr_pool_t * ptemp __attribute__((unused))) {
[26b08fd]132
[3b4c0d0]133/* Maintainer Logging */
134#if MOD_GNUTLS_DEBUG
135    apr_file_open(&debug_log_fp, "/tmp/gnutls_debug", APR_APPEND | APR_WRITE | APR_CREATE, APR_OS_DEFAULT, pconf);
[e183628]136    _gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
137    gnutls_global_set_log_level(9);
138    gnutls_global_set_log_function(gnutls_debug_log_all);
[37f8282]139    _gnutls_log(debug_log_fp, "gnutls: %s\n", gnutls_check_version(NULL));
[671b64f]140#endif
[3b4c0d0]141
[33826c5]142    int ret;
[26b08fd]143
[3b4c0d0]144        /* Check for required GnuTLS Library Version */
[932b68e]145    if (gnutls_check_version(LIBGNUTLS_VERSION) == NULL) {
[cb5188f]146                ap_log_perror(APLOG_MARK, APLOG_EMERG, 0, plog, "gnutls_check_version() failed. Required: "
[9ecd212]147                                        "gnutls-%s Found: gnutls-%s", LIBGNUTLS_VERSION, gnutls_check_version(NULL));
[421ef1c]148        return DONE;
[e183628]149    }
[e02dd8c]150
[3b4c0d0]151        /* Generate a Session Key */
[e183628]152    ret = gnutls_session_ticket_key_generate(&session_ticket_key);
153    if (ret < 0) {
[9ecd212]154                ap_log_perror(APLOG_MARK, APLOG_EMERG, 0, plog, "gnutls_session_ticket_key_generate: %s", gnutls_strerror(ret));
[421ef1c]155                return DONE;
[e183628]156    }
[e5bbda4]157
[60868d2]158    /* Initialize default priority setting */
[0fcba60]159    ret = mgs_default_priority_init();
[60868d2]160    if (ret < 0)
161    {
162        ap_log_perror(APLOG_MARK, APLOG_EMERG, 0, plog,
[a66b5be]163                      "gnutls_priority_init failed for default '"
164                      MGS_DEFAULT_PRIORITY "': %s (%d)",
165                      gnutls_strerror(ret), ret);
[60868d2]166        return DONE;
167    }
168
[b4739cd]169    AP_OPTIONAL_HOOK(status_hook, mgs_status_hook, NULL, NULL, APR_HOOK_MIDDLE);
170
[c005645]171    ap_mutex_register(pconf, MGS_CACHE_MUTEX_NAME, NULL, APR_LOCK_DEFAULT, 0);
[d6834e0]172    ap_mutex_register(pconf, MGS_OCSP_MUTEX_NAME, NULL, APR_LOCK_DEFAULT, 0);
[babdb29]173    ap_mutex_register(pconf, MGS_OCSP_CACHE_MUTEX_NAME, NULL,
174                      APR_LOCK_DEFAULT, 0);
[c005645]175
176    /* Register a pool clean-up function */
[421ef1c]177    apr_pool_cleanup_register(pconf, NULL, mgs_cleanup_pre_config, apr_pool_cleanup_null);
[c301152]178
[e183628]179    return OK;
[c301152]180}
181
[9cee2e9]182
183
184/**
185 * Get the list of available protocols for this connection and add it
186 * to the GnuTLS session. Must run before the client hello function.
187 */
188static void prepare_alpn_proposals(mgs_handle_t *ctxt)
189{
190    /* Check if any protocol upgrades are available
191     *
192     * The "report_all" parameter to ap_get_protocol_upgrades() is 0
193     * (report only more preferable protocols) because setting it to 1
194     * doesn't actually report ALL protocols, but only all except the
195     * current one. This way we can at least list the current one as
196     * available by appending it without potentially negotiating a
197     * less preferred protocol. */
198    const apr_array_header_t *pupgrades = NULL;
199    apr_status_t ret =
[4963516]200        ap_get_protocol_upgrades(ctxt->c, NULL, ctxt->sc->s,
[9cee2e9]201                                 /*report_all*/ 0, &pupgrades);
202    if (ret != APR_SUCCESS)
203    {
204        ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, ctxt->c,
205                      "%s: ap_get_protocol_upgrades() failed, "
206                      "cannot configure ALPN!", __func__);
207        return;
208    }
209
210    if (pupgrades == NULL || pupgrades->nelts == 0)
211    {
212        ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, ctxt->c,
213                      "%s: No protocol upgrades available.", __func__);
214        return;
215    }
216
[6200f6f]217    ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, ctxt->c,
[9cee2e9]218                  "%s: Found %d protocol upgrade(s) for ALPN: %s",
219                  __func__, pupgrades->nelts,
220                  apr_array_pstrcat(ctxt->c->pool, pupgrades, ','));
221    gnutls_datum_t *alpn_protos =
[08c48d7]222        mgs_str_array_to_datum_array(pupgrades,
223                                     ctxt->c->pool,
224                                     pupgrades->nelts + 1);
[9cee2e9]225
226    /* Add the current (default) protocol at the end of the list */
227    alpn_protos[pupgrades->nelts].data =
228        (void*) apr_pstrdup(ctxt->c->pool, ap_get_protocol(ctxt->c));
229    alpn_protos[pupgrades->nelts].size =
230        strlen((char*) alpn_protos[pupgrades->nelts].data);
231    ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, ctxt->c,
232                  "%s: Adding current protocol %s to ALPN set.",
233                  __func__, alpn_protos[pupgrades->nelts].data);
234
235    gnutls_alpn_set_protocols(ctxt->session,
236                              alpn_protos,
237                              pupgrades->nelts,
238                              GNUTLS_ALPN_SERVER_PRECEDENCE);
239}
240
241
242
243/**
244 * Check if ALPN selected any protocol upgrade, try to switch if so.
245 */
246static int process_alpn_result(mgs_handle_t *ctxt)
247{
248    int ret = 0;
249    gnutls_datum_t alpn_proto;
250    ret = gnutls_alpn_get_selected_protocol(ctxt->session, &alpn_proto);
251    if (ret != GNUTLS_E_SUCCESS)
252    {
253        ap_log_cerror(APLOG_MARK, APLOG_TRACE1, APR_SUCCESS, ctxt->c,
254                      "%s: No ALPN result: %s (%d)",
255                      __func__, gnutls_strerror(ret), ret);
256        return GNUTLS_E_SUCCESS;
257    }
258
259    apr_array_header_t *client_protos =
260        apr_array_make(ctxt->c->pool, 1, sizeof(char *));
261    /* apr_pstrndup to ensure that the protocol is null terminated */
262    APR_ARRAY_PUSH(client_protos, char *) =
263        apr_pstrndup(ctxt->c->pool, (char*) alpn_proto.data, alpn_proto.size);
264    const char *selected =
[4963516]265        ap_select_protocol(ctxt->c, NULL, ctxt->sc->s, client_protos);
[9cee2e9]266
267    /* ap_select_protocol() will return NULL if none of the ALPN
268     * proposals matched. GnuTLS negotiated alpn_proto based on the
269     * list provided by the server, but the vhost might have changed
270     * based on SNI. Apache seems to adjust the proposal list to avoid
271     * such issues though.
272     *
273     * GnuTLS will return a fatal "no_application_protocol" alert as
274     * required by RFC 7301 if the post client hello function returns
275     * GNUTLS_E_NO_APPLICATION_PROTOCOL. */
276    if (!selected)
277    {
278        ap_log_cerror(APLOG_MARK, APLOG_ERR, APR_EGENERAL, ctxt->c,
279                      "%s: ap_select_protocol() returned NULL! Please "
280                      "make sure any overlapping vhosts have the same "
281                      "protocols available.",
282                      __func__);
283        return GNUTLS_E_NO_APPLICATION_PROTOCOL;
284    }
285
286    if (strcmp(selected, ap_get_protocol(ctxt->c)) == 0)
287    {
288        ap_log_cerror(APLOG_MARK, APLOG_TRACE1, APR_SUCCESS, ctxt->c,
289                      "%s: Already using protocol '%s', nothing to do.",
290                      __func__, selected);
291        return GNUTLS_E_SUCCESS;
292    }
293
294    ap_log_cerror(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, ctxt->c,
295                  "%s: Switching protocol to '%s' based on ALPN.",
296                  __func__, selected);
297    apr_status_t status = ap_switch_protocol(ctxt->c, NULL,
[4963516]298                                             ctxt->sc->s,
[9cee2e9]299                                             selected);
300    if (status != APR_SUCCESS)
301    {
302        ap_log_cerror(APLOG_MARK, APLOG_ERR, status, ctxt->c,
303                      "%s: Protocol switch to '%s' failed!",
304                      __func__, selected);
305        return GNUTLS_E_NO_APPLICATION_PROTOCOL;
306    }
307    /* ALPN done! */
308    return GNUTLS_E_SUCCESS;
309}
310
311
312
[017ef2d]313/**
[c0fc11e]314 * (Re-)Load credentials and priorities for the connection. This is
315 * meant to be called after virtual host selection in the pre or post
316 * client hello hook.
[017ef2d]317 */
[c0fc11e]318static int reload_session_credentials(mgs_handle_t *ctxt)
[017ef2d]319{
[9180a60]320    int ret = 0;
[7bebb42]321
[c0fc11e]322    gnutls_certificate_server_set_request(ctxt->session,
323                                          ctxt->sc->client_verify_mode);
[7bebb42]324
[beb14d9]325    /* Set x509 credentials */
[c0fc11e]326    gnutls_credentials_set(ctxt->session,
327                           GNUTLS_CRD_CERTIFICATE, ctxt->sc->certs);
[beb14d9]328    /* Set Anon credentials */
[c0fc11e]329    gnutls_credentials_set(ctxt->session, GNUTLS_CRD_ANON,
330                           ctxt->sc->anon_creds);
[7bebb42]331
[787dab7]332#ifdef ENABLE_SRP
[3b4c0d0]333        /* Set SRP credentials */
334    if (ctxt->sc->srp_tpasswd_conf_file != NULL && ctxt->sc->srp_tpasswd_file != NULL) {
[c0fc11e]335        gnutls_credentials_set(ctxt->session, GNUTLS_CRD_SRP,
336                               ctxt->sc->srp_creds);
[e183628]337    }
[787dab7]338#endif
[7bebb42]339
[469861a]340    /* Enable session tickets */
341    if (session_ticket_key.data != NULL &&
342        ctxt->sc->tickets == GNUTLS_ENABLED_TRUE)
343    {
344        ret = gnutls_session_ticket_enable_server(ctxt->session, &session_ticket_key);
345        if (ret != GNUTLS_E_SUCCESS)
346            ap_log_cerror(APLOG_MARK, APLOG_ERR, APR_EGENERAL, ctxt->c,
347                          "gnutls_session_ticket_enable_server failed: %s (%d)",
348                          gnutls_strerror(ret), ret);
349    }
350
[9cee2e9]351    /* Update the priorities - to avoid negotiating a ciphersuite that is not
[e183628]352     * enabled on this virtual server. Note that here we ignore the version
[9cee2e9]353     * negotiation. */
[c0fc11e]354    ret = gnutls_priority_set(ctxt->session, ctxt->sc->priorities);
355
356    return ret;
357}
358
359
360
361/**
[0da10eb]362 * Post client hello hook function for GnuTLS. This function has two
363 * purposes: Firstly, it acts as a fallback for early_sni_hook(), by
364 * parsing SNI and selecting a virtual host based on it if
365 * necessary. Secondly, it calls ALPN processing.
[c0fc11e]366 *
367 * @param session the TLS session
368 *
369 * @return zero or a GnuTLS error code, as required by GnuTLS hook
370 * definition
371 */
[0da10eb]372static int post_client_hello_hook(gnutls_session_t session)
[c0fc11e]373{
374    int ret = 0;
375    mgs_handle_t *ctxt = gnutls_session_get_ptr(session);
376
[64470ce]377    /* If ctxt->sni_name is set at this point the early_sni_hook()
378     * function ran, found an SNI server name, selected a virtual
379     * host, and set up credentials, so we don't need to do that
380     * again. Otherwise try again, to cover GnuTLS versions < 3.6.3
381     * and pick up future extensions to gnutls_server_name_get(). */
382    if (ctxt->sni_name == NULL)
[c0fc11e]383    {
[64470ce]384        /* try to find a virtual host */
385        mgs_srvconf_rec *tsc = mgs_find_sni_server(ctxt);
386        if (tsc != NULL)
387        {
388            /* Found a TLS vhost based on the SNI, configure the
389             * connection context. */
390            ctxt->sc = tsc;
391        }
[c0fc11e]392
[64470ce]393        ap_log_cerror(APLOG_MARK, APLOG_TRACE1, APR_SUCCESS, ctxt->c,
394                      "%s: Loading credentials in post client hello hook",
395                      __func__);
396        reload_session_credentials(ctxt);
397    }
[c0fc11e]398
399    ret = process_alpn_result(ctxt);
400    if (ret != GNUTLS_E_SUCCESS)
401        return ret;
[017ef2d]402
[e183628]403    /* actually it shouldn't fail since we have checked at startup */
[9180a60]404    return ret;
[7bebb42]405}
406
[671b64f]407static int cert_retrieve_fn(gnutls_session_t session,
[65c84e5]408                            const struct gnutls_cert_retr_st *info __attribute__((unused)),
[259e835]409                            gnutls_pcert_st **pcerts,
410                            unsigned int *pcert_length,
[65c84e5]411                            gnutls_ocsp_data_st **ocsp,
412                            unsigned int *ocsp_length,
413                            gnutls_privkey_t *privkey,
414                            unsigned int *flags)
[031acac]415{
416    _gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
[3b4c0d0]417
[031acac]418    mgs_handle_t *ctxt;
[3b4c0d0]419
420    if (session == NULL) {
421                // ERROR INVALID SESSION
422        return -1;
[031acac]423    }
424
[c0dd3ab]425    ctxt = gnutls_transport_get_ptr(session);
426
427    if (gnutls_certificate_type_get(session) == GNUTLS_CRT_X509) {
[3b4c0d0]428                // X509 CERTIFICATE
[031acac]429        *pcerts = ctxt->sc->certs_x509_chain;
430        *pcert_length = ctxt->sc->certs_x509_chain_num;
[65c84e5]431        *ocsp = NULL;
432        *ocsp_length = 0;
[031acac]433        *privkey = ctxt->sc->privkey_x509;
[65c84e5]434        *flags = 0;
[556783e]435
436        if (ctxt->sc->ocsp_staple == GNUTLS_ENABLED_TRUE)
437        {
438            gnutls_ocsp_data_st *resp =
[1c3853a]439                apr_palloc(ctxt->c->pool,
[845c112]440                           sizeof(gnutls_ocsp_data_st) * ctxt->sc->ocsp_num);
[556783e]441
[1c3853a]442            for (unsigned int i = 0; i < ctxt->sc->ocsp_num; i++)
[556783e]443            {
[1c3853a]444                resp[i].version = 0;
445                resp[i].exptime = 0;
446
447                int ret = mgs_get_ocsp_response(ctxt, ctxt->sc->ocsp[i],
448                                                &resp[i].response);
449                if (ret == GNUTLS_E_SUCCESS)
450                {
451                    ocsp[i] = resp;
452                    *ocsp_length = i + 1;
453                }
454                else
455                    break;
[556783e]456            }
457        }
458
[e183628]459        return 0;
[3b4c0d0]460    } else {
461                // UNKNOWN CERTIFICATE
462            return -1;
463        }
[7bebb42]464}
465
[a2b4ab6]466
467
468/**
469 * Try to estimate a GnuTLS security parameter based on the given
470 * private key. Any errors are logged.
471 *
472 * @param s The `server_rec` to use for logging
473 *
474 * @param key The private key to use
475 *
476 * @return `gnutls_sec_param_t` as returned by
477 * `gnutls_pk_bits_to_sec_param` for the key properties, or
478 * GNUTLS_SEC_PARAM_UNKNOWN in case of error
479 */
480static gnutls_sec_param_t sec_param_from_privkey(server_rec *server,
481                                                 gnutls_privkey_t key)
482{
483    unsigned int bits = 0;
484    int pk_algo = gnutls_privkey_get_pk_algorithm(key, &bits);
485    if (pk_algo < 0)
486    {
487        ap_log_error(APLOG_MARK, APLOG_ERR, APR_EGENERAL, server,
488                     "%s: Could not get private key parameters: %s (%d)",
489                     __func__, gnutls_strerror(pk_algo), pk_algo);
490        return GNUTLS_SEC_PARAM_UNKNOWN;
491    }
492    return gnutls_pk_bits_to_sec_param(pk_algo, bits);
493}
494
495
496
497/**
498 * Configure the default DH groups to use for the given server. When
499 * compiled against GnuTLS version 3.5.6 or newer the known DH group
500 * matching the GnuTLS security parameter estimated from the private
501 * key is used. Otherwise the ffdhe2048 DH group as defined in RFC
502 * 7919, Appendix A.1 is the default.
503 *
504 * @param server the host to configure
505 *
506 * @return `OK` on success, `HTTP_UNAUTHORIZED` otherwise
507 */
508static int set_default_dh_param(server_rec *server)
509{
510    mgs_srvconf_rec *sc = (mgs_srvconf_rec *)
511        ap_get_module_config(server->module_config, &gnutls_module);
512
513    gnutls_sec_param_t seclevel = GNUTLS_SEC_PARAM_UNKNOWN;
514    if (sc->privkey_x509)
515    {
516        seclevel = sec_param_from_privkey(server, sc->privkey_x509);
517        ap_log_error(APLOG_MARK, APLOG_TRACE1, APR_SUCCESS, server,
518                     "%s: GnuTLS security param estimated based on "
519                     "private key '%s': %s",
520                     __func__, sc->x509_key_file,
521                     gnutls_sec_param_get_name(seclevel));
522    }
523
524    if (seclevel == GNUTLS_SEC_PARAM_UNKNOWN)
525        seclevel = GNUTLS_SEC_PARAM_MEDIUM;
526    ap_log_error(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, server,
527                 "%s: Setting DH params for security level '%s'.",
528                 __func__, gnutls_sec_param_get_name(seclevel));
529
530    int ret = gnutls_certificate_set_known_dh_params(sc->certs, seclevel);
531    if (ret < 0)
532    {
533        ap_log_error(APLOG_MARK, APLOG_EMERG, APR_EGENERAL, server,
534                     "%s: setting known DH params failed: %s (%d)",
535                     __func__, gnutls_strerror(ret), ret);
536        return HTTP_UNAUTHORIZED;
537    }
538    ret = gnutls_anon_set_server_known_dh_params(sc->anon_creds, seclevel);
539    if (ret < 0)
540    {
541        ap_log_error(APLOG_MARK, APLOG_EMERG, APR_EGENERAL, server,
542                     "%s: setting known DH params failed: %s (%d)",
543                     __func__, gnutls_strerror(ret), ret);
544        return HTTP_UNAUTHORIZED;
545    }
546
547    return OK;
548}
549
550
551
[104e881]552/**
[33fa7d5]553 * Pool cleanup hook to release a gnutls_x509_tlsfeatures_t structure.
554 */
555apr_status_t mgs_cleanup_tlsfeatures(void *data)
556{
557    gnutls_x509_tlsfeatures_t feat = *((gnutls_x509_tlsfeatures_t*) data);
558    gnutls_x509_tlsfeatures_deinit(feat);
559    return APR_SUCCESS;
560}
561
562
563
564/**
[104e881]565 * Post config hook.
566 *
[64856fd]567 * Must return OK or DECLINED on success, something else on
568 * error. These codes are defined in Apache httpd.h along with the
569 * HTTP status codes, so I'm going to use HTTP error codes both for
570 * fun (and to avoid conflicts).
571 */
572int mgs_hook_post_config(apr_pool_t *pconf,
573                         apr_pool_t *plog __attribute__((unused)),
[eee1432]574                         apr_pool_t *ptemp,
[64856fd]575                         server_rec *base_server)
576{
[e183628]577    int rv;
578    server_rec *s;
579    mgs_srvconf_rec *sc_base;
580
581    s = base_server;
[3b4c0d0]582    sc_base = (mgs_srvconf_rec *) ap_get_module_config(s->module_config, &gnutls_module);
[e183628]583
584
[de1ceab]585    rv = mgs_cache_post_config(pconf, ptemp, s, sc_base);
[c005645]586    if (rv != APR_SUCCESS)
587    {
[e183628]588        ap_log_error(APLOG_MARK, APLOG_STARTUP, rv, s,
[c005645]589                     "Post config for cache failed.");
[64856fd]590        return HTTP_INSUFFICIENT_STORAGE;
[e183628]591    }
592
[d6834e0]593    if (sc_base->ocsp_mutex == NULL)
594    {
595        rv = ap_global_mutex_create(&sc_base->ocsp_mutex, NULL,
596                                    MGS_OCSP_MUTEX_NAME, NULL,
597                                    base_server, pconf, 0);
598        if (rv != APR_SUCCESS)
[4f7edd5]599            return rv;
[d6834e0]600    }
601
[9ca1f21]602    /* If GnuTLSP11Module is set, load the listed PKCS #11
603     * modules. Otherwise system defaults will be used. */
604    if (sc_base->p11_modules != NULL)
[87f1ed2]605    {
[746e993]606        rv = gnutls_pkcs11_init(GNUTLS_PKCS11_FLAG_MANUAL, NULL);
607        if (rv < 0)
608        {
[87f1ed2]609            ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, s,
[f21d2a6]610                         "GnuTLS: Initializing PKCS #11 "
[87f1ed2]611                         "failed: %s (%d).",
[f21d2a6]612                         gnutls_strerror(rv), rv);
[746e993]613        }
614        else
615        {
[dff03fa]616            for (int i = 0; i < sc_base->p11_modules->nelts; i++)
[9ca1f21]617            {
618                char *p11_module =
619                    APR_ARRAY_IDX(sc_base->p11_modules, i, char *);
620                rv = gnutls_pkcs11_add_provider(p11_module, NULL);
621                if (rv != GNUTLS_E_SUCCESS)
[15368a4]622                    ap_log_error(APLOG_MARK, APLOG_STARTUP, APR_EGENERAL, s,
[9ca1f21]623                                 "GnuTLS: Loading PKCS #11 provider module %s "
624                                 "failed: %s (%d).",
625                                 p11_module, gnutls_strerror(rv), rv);
[15368a4]626                else
627                    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s,
628                                 "%s: PKCS #11 provider module %s loaded.",
629                                 __func__, p11_module);
[9ca1f21]630            }
[746e993]631        }
[87f1ed2]632    }
633
[0e3f8c6]634    sc_base->singleton_wd =
635        mgs_new_singleton_watchdog(base_server, MGS_SINGLETON_WATCHDOG, pconf);
636
[33fa7d5]637    gnutls_x509_tlsfeatures_t *must_staple =
638        apr_palloc(ptemp, sizeof(gnutls_x509_tlsfeatures_t));
639    gnutls_x509_tlsfeatures_init(must_staple);
640    gnutls_x509_tlsfeatures_add(*must_staple, TLSFEATURE_MUST_STAPLE);
641    apr_pool_cleanup_register(ptemp, must_staple,
642                              mgs_cleanup_tlsfeatures,
643                              apr_pool_cleanup_null);
644
[d6834e0]645    for (s = base_server; s; s = s->next)
646    {
[d54572e]647        mgs_srvconf_rec *sc = (mgs_srvconf_rec *)
648            ap_get_module_config(s->module_config, &gnutls_module);
[d4c1a4e]649        sc->s = s;
[b94aee2]650        sc->cache_enable = sc_base->cache_enable;
[e809fb3]651        sc->cache = sc_base->cache;
[f52f1b4]652        if (sc->cache_timeout == MGS_TIMEOUT_UNSET)
653            sc->cache_timeout = sc_base->cache_timeout;
[babdb29]654        sc->ocsp_cache = sc_base->ocsp_cache;
[040387c]655
[0e3f8c6]656        sc->singleton_wd = sc_base->singleton_wd;
657
[040387c]658        /* defaults for unset values: */
659        if (sc->enabled == GNUTLS_ENABLED_UNSET)
660            sc->enabled = GNUTLS_ENABLED_FALSE;
[7d1ab49]661        if (sc->tickets == GNUTLS_ENABLED_UNSET)
[8d0efdc]662            sc->tickets = GNUTLS_ENABLED_FALSE;
[2aaf4f5]663        if (sc->export_certificates_size < 0)
664            sc->export_certificates_size = 0;
[efd3cfe]665        if (sc->client_verify_mode == -1)
[040387c]666            sc->client_verify_mode = GNUTLS_CERT_IGNORE;
[efd3cfe]667        if (sc->client_verify_method == mgs_cvm_unset)
[cf2b905]668            sc->client_verify_method = mgs_cvm_cartel;
[cb6476c]669
[bac1a32]670        // TODO: None of the stuff below needs to be done if
671        // sc->enabled == GNUTLS_ENABLED_FALSE, we could just continue
672        // to the next host.
673
674        /* Load certificates and stuff (includes parsing priority) */
675        rv = mgs_load_files(pconf, ptemp, s);
676        if (rv != 0) {
677            ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, s,
678                         "%s: Loading credentials failed!", __func__);
679            return HTTP_NOT_FOUND;
680        }
[fa6d0bb]681
682        sc->ocsp_mutex = sc_base->ocsp_mutex;
[cb6476c]683        /* init OCSP configuration unless explicitly disabled */
684        if (sc->enabled && sc->ocsp_staple != GNUTLS_ENABLED_FALSE)
[fa6d0bb]685        {
[efc43b4]686            const char *err = mgs_ocsp_configure_stapling(pconf, ptemp, s);
687            if (err != NULL)
688            {
[cb6476c]689                /* If OCSP stapling is enabled only by default ignore
690                 * error and disable stapling */
691                if (sc->ocsp_staple == GNUTLS_ENABLED_UNSET)
692                {
693                    ap_log_error(APLOG_MARK, APLOG_INFO, APR_SUCCESS, s,
694                                 "Cannnot enable OCSP stapling for "
695                                 "host '%s:%d': %s",
696                                 s->server_hostname, s->addrs->host_port, err);
697                    sc->ocsp_staple = GNUTLS_ENABLED_FALSE;
698                }
699                /* If OCSP stapling is explicitly enabled this is a
700                 * critical error. */
701                else
702                {
703                    ap_log_error(APLOG_MARK, APLOG_STARTUP, APR_EINVAL, s,
704                                 "OCSP stapling configuration failed for "
705                                 "host '%s:%d': %s",
706                                 s->server_hostname, s->addrs->host_port, err);
707                    return HTTP_INTERNAL_SERVER_ERROR;
708                }
709            }
710            else
711            {
712                /* Might already be set */
713                sc->ocsp_staple = GNUTLS_ENABLED_TRUE;
714                /* Set up stapling */
715                rv = mgs_ocsp_enable_stapling(pconf, ptemp, s);
716                if (rv != OK && rv != DECLINED)
717                    return rv;
[efc43b4]718            }
[fa6d0bb]719        }
[040387c]720
[e183628]721        /* Check if the priorities have been set */
[33826c5]722        if (sc->priorities == NULL && sc->enabled == GNUTLS_ENABLED_TRUE) {
[60868d2]723            ap_log_error(APLOG_MARK, APLOG_INFO, 0, s,
724                         "No GnuTLSPriorities directive for host '%s:%d', "
[a66b5be]725                         "using default '" MGS_DEFAULT_PRIORITY "'.",
726                         s->server_hostname, s->addrs->host_port);
[0fcba60]727            sc->priorities = mgs_get_default_prio();
[e183628]728        }
729
[a2b4ab6]730        /* Set host DH params from user configuration or defaults */
[410d216]731        if (sc->dh_params != NULL) {
732            gnutls_certificate_set_dh_params(sc->certs, sc->dh_params);
[671b64f]733            gnutls_anon_set_server_dh_params(sc->anon_creds, sc->dh_params);
[a2b4ab6]734        } else {
735            rv = set_default_dh_param(s);
736            if (rv != OK)
737                return rv;
[e183628]738        }
739
[65c84e5]740        gnutls_certificate_set_retrieve_function3(sc->certs, cert_retrieve_fn);
[7bebb42]741
[2b76a9c]742        if ((sc->certs_x509_chain == NULL || sc->certs_x509_chain_num < 1) &&
[7921dc7]743            sc->enabled == GNUTLS_ENABLED_TRUE) {
[671b64f]744                        ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, s,
[031acac]745                                                "GnuTLS: Host '%s:%d' is missing a Certificate File!",
[8273683]746                                                s->server_hostname, s->addrs->host_port);
[64856fd]747            return HTTP_UNAUTHORIZED;
[e183628]748        }
[2b76a9c]749        if (sc->enabled == GNUTLS_ENABLED_TRUE &&
[7921dc7]750            (sc->certs_x509_chain_num > 0 && sc->privkey_x509 == NULL))
[44e8944]751        {
[671b64f]752                        ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, s,
[031acac]753                                                "GnuTLS: Host '%s:%d' is missing a Private Key File!",
[8273683]754                                                s->server_hostname, s->addrs->host_port);
[64856fd]755            return HTTP_UNAUTHORIZED;
[e183628]756        }
757
[33fa7d5]758        if (sc->certs_x509_chain_num > 0
759            && gnutls_x509_tlsfeatures_check_crt(*must_staple,
760                                                 sc->certs_x509_crt_chain[0])
761            && sc->ocsp_staple == GNUTLS_ENABLED_FALSE)
762        {
763            ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
764                         "Must-Staple is set in the host certificate "
765                         "of '%s:%d', but stapling is disabled!",
766                         s->server_hostname, s->addrs->host_port);
767            return HTTP_UNAUTHORIZED;
768        }
769
[0de1839]770        if (sc->enabled == GNUTLS_ENABLED_TRUE
[4133f2d]771            && sc->proxy_enabled == GNUTLS_ENABLED_TRUE
[f265001]772            && load_proxy_x509_credentials(pconf, ptemp, s) != APR_SUCCESS)
[0de1839]773        {
[4133f2d]774            ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, s,
775                         "%s: loading proxy credentials for host "
776                         "'%s:%d' failed, exiting!",
[8273683]777                         __func__, s->server_hostname, s->addrs->host_port);
[64856fd]778            return HTTP_PROXY_AUTHENTICATION_REQUIRED;
[0de1839]779        }
[e183628]780    }
781
782
[64856fd]783    ap_add_version_component(pconf, "mod_gnutls/" MOD_GNUTLS_VERSION);
[e183628]784
[4ec9183]785    {
[83eafed]786        const char* libvers = gnutls_check_version(NULL);
787        char* gnutls_version = NULL;
[64856fd]788        if(libvers && (gnutls_version = apr_psprintf(pconf, "GnuTLS/%s", libvers))) {
789            ap_add_version_component(pconf, gnutls_version);
[83eafed]790        } else {
[4ec9183]791            // In case we could not create the above string go for the static version instead
[64856fd]792            ap_add_version_component(pconf, "GnuTLS/" GNUTLS_VERSION "-static");
[4ec9183]793        }
794    }
795
[e183628]796    return OK;
[c301152]797}
798
[c005645]799void mgs_hook_child_init(apr_pool_t *p, server_rec *s)
800{
[e183628]801    apr_status_t rv = APR_SUCCESS;
[c005645]802    mgs_srvconf_rec *sc = (mgs_srvconf_rec *)
803        ap_get_module_config(s->module_config, &gnutls_module);
[e183628]804
805    _gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
[031acac]806
[c005645]807    /* if we use PKCS #11 reinitialize it */
[031acac]808    if (mgs_pkcs11_reinit(s) < 0) {
809            ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s,
810                    "GnuTLS: Failed to reinitialize PKCS #11");
811            exit(-1);
812    }
813
[babdb29]814    if (sc->cache_enable == GNUTLS_ENABLED_TRUE)
815    {
816        rv = mgs_cache_child_init(p, s, sc->cache, MGS_CACHE_MUTEX_NAME);
817        if (rv != APR_SUCCESS)
[e183628]818            ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
[babdb29]819                    "Child init for session cache failed!");
820    }
821
[eced11a]822    if (sc->ocsp_cache != NULL)
[babdb29]823    {
824        rv = mgs_cache_child_init(p, s, sc->ocsp_cache,
825                                  MGS_OCSP_CACHE_MUTEX_NAME);
826        if (rv != APR_SUCCESS)
827            ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
828                    "Child init for OCSP cache failed!");
[e183628]829    }
[c005645]830
[babdb29]831    /* reinit OCSP request mutex */
[d6834e0]832    const char *lockfile = apr_global_mutex_lockfile(sc->ocsp_mutex);
833    rv = apr_global_mutex_child_init(&sc->ocsp_mutex, lockfile, p);
834    if (rv != APR_SUCCESS)
835        ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
836                     "Failed to reinit mutex '" MGS_OCSP_MUTEX_NAME "'.");
[c301152]837}
838
[e183628]839const char *mgs_hook_http_scheme(const request_rec * r) {
840    mgs_srvconf_rec *sc;
[c301152]841
[e183628]842    if (r == NULL)
843        return NULL;
[e02dd8c]844
[e183628]845    sc = (mgs_srvconf_rec *) ap_get_module_config(r->
846            server->module_config,
847            &gnutls_module);
[e02dd8c]848
[e183628]849    _gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
850    if (sc->enabled == GNUTLS_ENABLED_FALSE) {
851        return NULL;
852    }
[e02dd8c]853
[e183628]854    return "https";
[c301152]855}
856
[e183628]857apr_port_t mgs_hook_default_port(const request_rec * r) {
858    mgs_srvconf_rec *sc;
[e02dd8c]859
[e183628]860    if (r == NULL)
861        return 0;
[e02dd8c]862
[e183628]863    sc = (mgs_srvconf_rec *) ap_get_module_config(r->
864            server->module_config,
865            &gnutls_module);
[e02dd8c]866
[e183628]867    _gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
868    if (sc->enabled == GNUTLS_ENABLED_FALSE) {
869        return 0;
870    }
[c301152]871
[e183628]872    return 443;
[c301152]873}
874
[c0fc11e]875
[c301152]876
[7bebb42]877typedef struct {
[e183628]878    mgs_handle_t *ctxt;
879    mgs_srvconf_rec *sc;
880    const char *sni_name;
[c301152]881} vhost_cb_rec;
882
[14d718f]883/**
884 * Matches the current vhost's ServerAlias directives
885 *
886 * @param x vhost callback record
887 * @param s server record
[104e881]888 * @param tsc mod_gnutls server data for `s`
889 *
[14d718f]890 * @return true if a match, false otherwise
891 *
892 */
[104e881]893int check_server_aliases(vhost_cb_rec *x, server_rec * s, mgs_srvconf_rec *tsc)
894{
[3c6645b]895    apr_array_header_t *names;
896    char ** name;
897
[e63515a]898    /* Check ServerName first */
899    if (strcasecmp(x->sni_name, s->server_hostname) == 0)
900    {
[3c6645b]901        // We have a match, save this server configuration
902        x->sc = tsc;
[e63515a]903        return 1;
904    }
905
906    /* Check any ServerAlias directives */
907    if(s->names->nelts)
908    {
[3c6645b]909        names = s->names;
[4e388b0]910        name = (char **) names->elts;
[3c6645b]911        for (int i = 0; i < names->nelts; ++i)
[dff03fa]912        {
[4e388b0]913            if (!name[i])
914                continue;
915            if (strcasecmp(x->sni_name, name[i]) == 0)
916            {
[3c6645b]917                x->sc = tsc;
[e63515a]918                return 1;
[3c6645b]919            }
920        }
[e63515a]921    }
922
923    /* ServerAlias directives may contain wildcards, check those last. */
924    if(s->wild_names->nelts)
925    {
[3c6645b]926        names = s->wild_names;
[f06c148]927        name = (char **) names->elts;
[3c6645b]928        for (int i = 0; i < names->nelts; ++i)
[dff03fa]929        {
[f06c148]930            if (!name[i])
931                continue;
932            if (ap_strcasecmp_match(x->sni_name, name[i]) == 0)
933            {
[3c6645b]934                x->sc = tsc;
[e63515a]935                return 1;
[3c6645b]936            }
937        }
938    }
[e63515a]939    return 0;
[14d718f]940}
941
[7511bfa]942static int vhost_cb(void *baton, conn_rec *conn, server_rec * s)
943{
[e183628]944    vhost_cb_rec *x = baton;
[d54572e]945    mgs_srvconf_rec *tsc = (mgs_srvconf_rec *)
946        ap_get_module_config(s->module_config, &gnutls_module);
[e183628]947    _gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
[7bebb42]948
[adceac0]949    if (tsc->enabled != GNUTLS_ENABLED_TRUE) {
[e183628]950        return 0;
951    }
[671b64f]952
[b1c2b01]953    if (tsc->certs_x509_chain_num > 0) {
[031acac]954        /* this check is there to warn administrator of any missing hostname
955         * in the certificate. */
[d54572e]956        int ret = gnutls_x509_crt_check_hostname(tsc->certs_x509_crt_chain[0],
957                                                 s->server_hostname);
[b1c2b01]958        if (0 == ret)
[7511bfa]959            ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, conn,
960                          "GnuTLS: the certificate doesn't match requested "
961                          "hostname '%s'", s->server_hostname);
[b1c2b01]962    } else {
[7511bfa]963        ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, conn,
964                      "GnuTLS: SNI request for '%s' but no X.509 certs "
965                      "available at all",
966                      s->server_hostname);
[b1c2b01]967    }
[3b4c0d0]968        return check_server_aliases(x, s, tsc);
[c301152]969}
970
[98cf33f]971/**
972 * Get SNI data from GnuTLS (if any) and search for a matching virtual
973 * host configuration. This method is called from the post client
974 * hello function.
975 *
[c0fc11e]976 * @param ctxt the mod_gnutls connection handle
[98cf33f]977 *
978 * @return either the matching mod_gnutls server config, or `NULL`
979 */
[c0fc11e]980mgs_srvconf_rec *mgs_find_sni_server(mgs_handle_t *ctxt)
[5342265]981{
[c0fc11e]982    if (ctxt->sni_name == NULL)
[98cf33f]983    {
[c0fc11e]984        const char *sni_name = mgs_server_name_get(ctxt);
985        if (sni_name != NULL)
986            ctxt->sni_name = sni_name;
[79fc46b]987        else
988            return NULL;
[e183628]989    }
[7bebb42]990
[98cf33f]991    ap_log_cerror(APLOG_MARK, APLOG_TRACE1, APR_SUCCESS, ctxt->c,
[017ef2d]992                  "%s: client requested server '%s'.",
[c0fc11e]993                  __func__, ctxt->sni_name);
[017ef2d]994
995    /* Search for vhosts matching connection parameters and the
996     * SNI. If a match is found, cbx.sc will contain the mod_gnutls
997     * server config for the vhost. */
998    vhost_cb_rec cbx = {
999        .ctxt = ctxt,
1000        .sc = NULL,
[c0fc11e]1001        .sni_name = ctxt->sni_name
[017ef2d]1002    };
[c0fc11e]1003    int rv = ap_vhost_iterate_given_conn(ctxt->c, vhost_cb, &cbx);
[e183628]1004    if (rv == 1) {
1005        return cbx.sc;
1006    }
1007    return NULL;
[836417f]1008}
1009
[7ff6c6c]1010
1011
[0da10eb]1012/**
1013 * Pre client hello hook function for GnuTLS that implements early SNI
1014 * processing using `gnutls_ext_raw_parse()` (available since GnuTLS
1015 * 3.6.3). Reading the SNI (if any) before GnuTLS processes the client
1016 * hello allows loading virtual host settings that cannot be changed
1017 * in the post client hello hook, including ALPN proposals (required
1018 * for HTTP/2 support using the `Protocols` directive). In addition to
1019 * ALPN this function configures the server credentials.
1020 *
1021 * The function signature is required by the GnuTLS API.
1022 *
1023 * @param session the current session
1024 * @param htype handshake message type
1025 * @param when hook position relative to GnuTLS processing
1026 * @param incoming true if the message is incoming, for client hello
1027 * that means the hook is running on the server
1028 * @param msg raw message data
1029 *
1030 * @return `GNUTLS_E_SUCCESS` or a GnuTLS error code
1031 */
[7ff6c6c]1032static int early_sni_hook(gnutls_session_t session,
[0da10eb]1033                          unsigned int htype,
1034                          unsigned when,
[7ff6c6c]1035                          unsigned int incoming,
1036                          const gnutls_datum_t *msg)
1037{
1038    if (!incoming)
1039        return 0;
1040
1041    mgs_handle_t *ctxt = (mgs_handle_t *) gnutls_session_get_ptr(session);
[a26d3f6]1042
1043    /* This is a hook for pre client hello ONLY! */
1044    if (htype != GNUTLS_HANDSHAKE_CLIENT_HELLO || when != GNUTLS_HOOK_PRE)
1045    {
1046        ap_log_cerror(APLOG_MARK, APLOG_ERR, APR_EINVAL, ctxt->c,
1047                      "%s called outside pre client hello hook, this "
1048                      "indicates a programming error!",
1049                      __func__);
1050        return GNUTLS_E_SELF_TEST_ERROR;
1051    }
1052
[7ff6c6c]1053    int ret = gnutls_ext_raw_parse(session, mgs_sni_ext_hook, msg,
1054                                   GNUTLS_EXT_RAW_FLAG_TLS_CLIENT_HELLO);
1055    if (ret == 0 && ctxt->sni_name != NULL)
[6200f6f]1056    {
1057        ap_log_cerror(APLOG_MARK, APLOG_TRACE1, APR_SUCCESS, ctxt->c,
[64470ce]1058                      "%s found SNI name: '%s'",
[7ff6c6c]1059                      __func__, ctxt->sni_name);
[64470ce]1060
[6200f6f]1061        /* try to find a virtual host for that name */
1062        mgs_srvconf_rec *tsc = mgs_find_sni_server(ctxt);
1063        if (tsc != NULL)
1064        {
1065            /* Found a TLS vhost based on the SNI, configure the
1066             * connection context. */
1067            ctxt->sc = tsc;
1068            ap_log_cerror(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, ctxt->c,
1069                          "%s: Selected virtual host %s from early SNI, "
1070                          "connection server is %s.",
1071                          __func__, ctxt->sc->s->server_hostname,
1072                          ctxt->c->base_server->server_hostname);
1073        }
[64470ce]1074    }
1075
1076    reload_session_credentials(ctxt);
1077
1078    prepare_alpn_proposals(ctxt);
1079
[7ff6c6c]1080    return ret;
1081}
1082
1083
1084
[2ceb836]1085/**
[b429e4c]1086 * This function is intended as a cleanup handler for connections
[2ceb836]1087 * using GnuTLS. If attached to the connection pool, it ensures that
1088 * session resources are released with the connection pool even if the
1089 * session wasn't terminated properly.
[b429e4c]1090 *
1091 * @param data must point to the mgs_handle_t associated with the
1092 * connection
1093 */
1094static apr_status_t cleanup_gnutls_session(void *data)
1095{
1096    /* nothing to do */
1097    if (data == NULL)
1098        return APR_SUCCESS;
1099
1100    /* check if session needs closing */
1101    mgs_handle_t *ctxt = (mgs_handle_t *) data;
1102    if (ctxt->session != NULL)
1103    {
[2ceb836]1104        ap_log_cerror(APLOG_MARK, APLOG_WARNING, APR_ECONNABORTED, ctxt->c,
1105                      "%s: connection pool cleanup in progress but %sTLS "
1106                      "session hasn't been terminated, trying to close",
1107                      __func__, IS_PROXY_STR(ctxt));
[b429e4c]1108        int ret;
1109        /* Try A Clean Shutdown */
1110        do
1111            ret = gnutls_bye(ctxt->session, GNUTLS_SHUT_WR);
1112        while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN);
1113        if (ret != GNUTLS_E_SUCCESS)
[2ceb836]1114            ap_log_cerror(APLOG_MARK, APLOG_INFO, APR_EGENERAL, ctxt->c,
[b429e4c]1115                          "%s: error while closing TLS %sconnection: %s (%d)",
1116                          __func__, IS_PROXY_STR(ctxt),
1117                          gnutls_strerror(ret), ret);
1118        else
[2ceb836]1119            ap_log_cerror(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, ctxt->c,
[b429e4c]1120                          "%s: TLS %sconnection closed.",
1121                          __func__, IS_PROXY_STR(ctxt));
1122        /* De-Initialize Session */
1123        gnutls_deinit(ctxt->session);
1124        ctxt->session = NULL;
1125    }
1126    return APR_SUCCESS;
1127}
1128
[e8acf05]1129static void create_gnutls_handle(conn_rec * c)
1130{
[e183628]1131    _gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
[e8acf05]1132
1133    /* Get connection specific configuration */
[235e109]1134    mgs_handle_t *ctxt = init_gnutls_ctxt(c);
[e8acf05]1135    ctxt->enabled = GNUTLS_ENABLED_TRUE;
[e183628]1136    ctxt->status = 0;
1137    ctxt->input_rc = APR_SUCCESS;
1138    ctxt->input_bb = apr_brigade_create(c->pool, c->bucket_alloc);
1139    ctxt->input_cbuf.length = 0;
1140    ctxt->output_rc = APR_SUCCESS;
1141    ctxt->output_bb = apr_brigade_create(c->pool, c->bucket_alloc);
1142    ctxt->output_blen = 0;
1143    ctxt->output_length = 0;
[e8acf05]1144
[d0be765]1145    /* Initialize GnuTLS Library */
[beb14d9]1146    int err = 0;
1147    if (ctxt->is_proxy == GNUTLS_ENABLED_TRUE)
1148    {
1149        /* this is an outgoing proxy connection, client mode */
1150        err = gnutls_init(&ctxt->session, GNUTLS_CLIENT);
1151        if (err != GNUTLS_E_SUCCESS)
1152            ap_log_cerror(APLOG_MARK, APLOG_ERR, err, c,
1153                          "gnutls_init for proxy connection failed: %s (%d)",
1154                          gnutls_strerror(err), err);
[33d812d]1155        gnutls_handshake_set_hook_function(ctxt->session,
1156                                           GNUTLS_HANDSHAKE_NEW_SESSION_TICKET,
[e6d9e47]1157                                           GNUTLS_HOOK_POST,
1158                                           mgs_proxy_got_ticket_func);
[411d286]1159        ctxt->proxy_ticket_key = mgs_proxy_ticket_id(ctxt, NULL);
[beb14d9]1160    }
1161    else
1162    {
1163        /* incoming connection, server mode */
[6fa6095]1164        err = gnutls_init(&ctxt->session,
1165                          GNUTLS_SERVER | GNUTLS_POST_HANDSHAKE_AUTH);
[e4b58b6]1166        if (err != GNUTLS_E_SUCCESS)
[beb14d9]1167            ap_log_cerror(APLOG_MARK, APLOG_ERR, err, c,
1168                          "gnutls_init for server side failed: %s (%d)",
1169                          gnutls_strerror(err), err);
[33d812d]1170
1171        /* Pre-handshake hook for early SNI parsing */
1172        gnutls_handshake_set_hook_function(ctxt->session,
1173                                           GNUTLS_HANDSHAKE_CLIENT_HELLO,
1174                                           GNUTLS_HOOK_PRE, early_sni_hook);
[d0be765]1175    }
[e183628]1176
[a2368a4]1177    /* Ensure TLS session resources are released when the connection
1178     * pool is cleared, if the filters haven't done that already. */
1179    apr_pool_pre_cleanup_register(c->pool, ctxt, cleanup_gnutls_session);
1180
[d0be765]1181    /* Set Default Priority */
[0fcba60]1182        err = gnutls_priority_set(ctxt->session, mgs_get_default_prio());
[e4b58b6]1183    if (err != GNUTLS_E_SUCCESS)
[60868d2]1184        ap_log_cerror(APLOG_MARK, APLOG_ERR, err, c,
1185                      "gnutls_priority_set failed!");
[64470ce]1186
1187    /* Post client hello hook (called after GnuTLS has parsed it) */
[e183628]1188    gnutls_handshake_set_post_client_hello_function(ctxt->session,
[0da10eb]1189            post_client_hello_hook);
[beb14d9]1190
[0de1839]1191    /* Set GnuTLS user pointer, so we can access the module session
1192     * context in GnuTLS callbacks */
1193    gnutls_session_set_ptr(ctxt->session, ctxt);
1194
[0da10eb]1195    /* If mod_gnutls is the TLS server, early_sni_hook (or
1196     * post_client_hello_hook, if early SNI is not available) will
1197     * load appropriate credentials during the handshake. However,
[beb14d9]1198     * when handling a proxy backend connection, mod_gnutls acts as
1199     * TLS client and credentials must be loaded here. */
1200    if (ctxt->is_proxy == GNUTLS_ENABLED_TRUE)
1201    {
1202        /* Set anonymous client credentials for proxy connections */
1203        gnutls_credentials_set(ctxt->session, GNUTLS_CRD_ANON,
1204                               ctxt->sc->anon_client_creds);
1205        /* Set x509 credentials */
1206        gnutls_credentials_set(ctxt->session, GNUTLS_CRD_CERTIFICATE,
[0de1839]1207                               ctxt->sc->proxy_x509_creds);
[beb14d9]1208        /* Load priorities from the server configuration */
[f030883]1209        err = gnutls_priority_set(ctxt->session, ctxt->sc->proxy_priorities);
[beb14d9]1210        if (err != GNUTLS_E_SUCCESS)
1211            ap_log_cerror(APLOG_MARK, APLOG_ERR, err, c,
[f030883]1212                          "%s: setting priorities for proxy connection "
1213                          "failed: %s (%d)",
[beb14d9]1214                          __func__, gnutls_strerror(err), err);
1215    }
1216
[d0be765]1217    /* Initialize Session Cache */
[e183628]1218    mgs_cache_session_init(ctxt);
[671b64f]1219
[33826c5]1220    /* Set pull, push & ptr functions */
1221    gnutls_transport_set_pull_function(ctxt->session,
[132eadc]1222                                       mgs_transport_read);
1223    gnutls_transport_set_pull_timeout_function(ctxt->session,
1224                                               mgs_transport_read_ready);
[33826c5]1225    gnutls_transport_set_push_function(ctxt->session,
[132eadc]1226                                       mgs_transport_write);
[9ee0464]1227    gnutls_transport_set_ptr(ctxt->session, ctxt);
[33826c5]1228    /* Add IO filters */
[671b64f]1229    ctxt->input_filter = ap_add_input_filter(GNUTLS_INPUT_FILTER_NAME,
1230            ctxt, NULL, c);
1231    ctxt->output_filter = ap_add_output_filter(GNUTLS_OUTPUT_FILTER_NAME,
[33826c5]1232            ctxt, NULL, c);
[e183628]1233}
[e02dd8c]1234
[e8acf05]1235int mgs_hook_pre_connection(conn_rec * c, void *csd __attribute__((unused)))
1236{
[e183628]1237    _gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
[e02dd8c]1238
[2f10643]1239    if (c->master)
1240    {
1241        ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, c,
1242                      "%s declined secondary connection", __func__);
1243        return DECLINED;
1244    }
1245
[e8acf05]1246    mgs_srvconf_rec *sc = (mgs_srvconf_rec *)
1247        ap_get_module_config(c->base_server->module_config, &gnutls_module);
1248    mgs_handle_t *ctxt = (mgs_handle_t *)
1249        ap_get_module_config(c->conn_config, &gnutls_module);
[c301152]1250
[2f10643]1251    if ((sc && (!sc->enabled))
1252        || (ctxt && ctxt->enabled == GNUTLS_ENABLED_FALSE))
[e8acf05]1253    {
1254        ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, "%s declined connection",
1255                      __func__);
[e183628]1256        return DECLINED;
1257    }
[ae4a2b0]1258
[33826c5]1259    create_gnutls_handle(c);
[e183628]1260    return OK;
1261}
[e02dd8c]1262
[e7cf823]1263
1264
1265/**
1266 * process_connection hook: Do a zero byte read to trigger the
1267 * handshake. Doesn't change anything for traditional protocols that
1268 * just do reads, but HTTP/2 needs the TLS handshake and ALPN to
1269 * happen before its process_connection hook runs.
1270 */
1271int mgs_hook_process_connection(conn_rec* c)
1272{
1273    mgs_handle_t *ctxt = (mgs_handle_t *)
1274        ap_get_module_config(c->conn_config, &gnutls_module);
1275
1276    if ((ctxt != NULL) && (ctxt->enabled == GNUTLS_ENABLED_TRUE))
1277    {
1278        /* This connection is supposed to use TLS. Give the filters a
1279         * kick with a zero byte read to trigger the handshake. */
1280        apr_bucket_brigade* temp =
1281            apr_brigade_create(c->pool, c->bucket_alloc);
1282        ap_get_brigade(c->input_filters, temp,
1283                       AP_MODE_INIT, APR_BLOCK_READ, 0);
1284        apr_brigade_destroy(temp);
1285    }
1286    return DECLINED;
1287}
1288
1289
1290
[de3fad3]1291/* Post request hook, checks if TLS connection and vhost match */
1292int mgs_req_vhost_check(request_rec *r)
1293{
1294    /* mod_gnutls server record for the request vhost */
1295    mgs_srvconf_rec *r_sc = (mgs_srvconf_rec *)
1296        ap_get_module_config(r->server->module_config, &gnutls_module);
1297    mgs_handle_t *ctxt = get_effective_gnutls_ctxt(r->connection);
1298
1299    /* Nothing to check for non-TLS and outgoing proxy connections */
1300    if (ctxt == NULL || !ctxt->enabled || ctxt->is_proxy)
1301        return DECLINED;
1302
1303    if (ctxt->sc != r_sc)
1304    {
1305        ap_log_cerror(APLOG_MARK, APLOG_ERR, APR_SUCCESS, ctxt->c,
1306                      "%s: Mismatch between handshake and request servers!",
1307                      __func__);
1308        return HTTP_MISDIRECTED_REQUEST;
1309    }
1310
[04753db8]1311    if (!ctxt->sni_name)
1312        return DECLINED;
1313
1314    /* Got an SNI name, so verify it matches. */
1315    ap_log_cerror(APLOG_MARK, APLOG_TRACE1, APR_SUCCESS, ctxt->c,
1316                  "%s: Checking request hostname against SNI name '%s'.",
1317                  __func__, ctxt->sni_name);
1318
1319    if (!r->hostname)
1320    {
1321        ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, r->connection,
1322                      "Client requested '%s' via SNI, but provided "
1323                      "no hostname in HTTP request!", ctxt->sni_name);
1324        return HTTP_MISDIRECTED_REQUEST;
1325    }
1326
1327    if (strcasecmp(r->hostname, ctxt->sni_name) != 0)
1328    {
1329        ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, r->connection,
1330                      "Client requested '%s' via SNI, but '%s' in "
1331                      "the HTTP request!", ctxt->sni_name, r->hostname);
1332        return HTTP_MISDIRECTED_REQUEST;
1333    }
1334
[de3fad3]1335    return DECLINED;
1336}
1337
1338
1339
[e183628]1340int mgs_hook_fixups(request_rec * r) {
1341    unsigned char sbuf[GNUTLS_MAX_SESSION_ID];
1342    const char *tmp;
1343    size_t len;
1344    mgs_handle_t *ctxt;
1345    int rv = OK;
[c301152]1346
[e183628]1347    if (r == NULL)
1348        return DECLINED;
[c301152]1349
[e183628]1350    _gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
1351    apr_table_t *env = r->subprocess_env;
[7bebb42]1352
[2f10643]1353    ctxt = get_effective_gnutls_ctxt(r->connection);
[c301152]1354
[e8acf05]1355    if (!ctxt || ctxt->enabled != GNUTLS_ENABLED_TRUE || ctxt->session == NULL)
1356    {
1357        ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "request declined in %s", __func__);
[e183628]1358        return DECLINED;
1359    }
[c301152]1360
[e183628]1361    apr_table_setn(env, "HTTPS", "on");
1362
1363    apr_table_setn(env, "SSL_VERSION_LIBRARY",
1364            "GnuTLS/" LIBGNUTLS_VERSION);
1365    apr_table_setn(env, "SSL_VERSION_INTERFACE",
1366            "mod_gnutls/" MOD_GNUTLS_VERSION);
1367
1368    apr_table_setn(env, "SSL_PROTOCOL",
[9720026]1369            gnutls_protocol_get_name(gnutls_protocol_get_version(ctxt->session)));
[e183628]1370
1371    /* should have been called SSL_CIPHERSUITE instead */
1372    apr_table_setn(env, "SSL_CIPHER",
[9720026]1373            gnutls_cipher_suite_get_name(gnutls_kx_get(ctxt->session),
1374                                         gnutls_cipher_get(ctxt->session),
1375                                         gnutls_mac_get(ctxt->session)));
[e183628]1376
[72377cf]1377    /* Compression support has been removed since GnuTLS 3.6.0 */
1378    apr_table_setn(env, "SSL_COMPRESS_METHOD", "NULL");
[7bebb42]1379
[787dab7]1380#ifdef ENABLE_SRP
[369f47a]1381    if (ctxt->sc->srp_tpasswd_conf_file != NULL && ctxt->sc->srp_tpasswd_file != NULL) {
1382        tmp = gnutls_srp_server_get_username(ctxt->session);
1383        apr_table_setn(env, "SSL_SRP_USER", (tmp != NULL) ? tmp : "");
1384    } else {
1385        apr_table_unset(env, "SSL_SRP_USER");
1386    }
[787dab7]1387#endif
[c301152]1388
[e183628]1389    if (apr_table_get(env, "SSL_CLIENT_VERIFY") == NULL)
1390        apr_table_setn(env, "SSL_CLIENT_VERIFY", "NONE");
[c301152]1391
[9720026]1392    unsigned int key_size = 8 * gnutls_cipher_get_key_size(gnutls_cipher_get(ctxt->session));
[e183628]1393    tmp = apr_psprintf(r->pool, "%u", key_size);
[c301152]1394
[e183628]1395    apr_table_setn(env, "SSL_CIPHER_USEKEYSIZE", tmp);
[c301152]1396
[e183628]1397    apr_table_setn(env, "SSL_CIPHER_ALGKEYSIZE", tmp);
[c301152]1398
[e183628]1399    apr_table_setn(env, "SSL_CIPHER_EXPORT",
1400            (key_size <= 40) ? "true" : "false");
[7bebb42]1401
[5674676]1402    int dhsize = gnutls_dh_get_prime_bits(ctxt->session);
1403    if (dhsize > 0) {
1404        tmp = apr_psprintf(r->pool, "%d", dhsize);
1405        apr_table_setn(env, "SSL_DH_PRIME_BITS", tmp);
1406    }
1407
[e183628]1408    len = sizeof (sbuf);
1409    gnutls_session_get_id(ctxt->session, sbuf, &len);
[f450ac9]1410    apr_table_setn(env, "SSL_SESSION_ID",
1411                   apr_pescape_hex(r->pool, sbuf, len, 0));
[7ba803b]1412
[3b4c0d0]1413    if (gnutls_certificate_type_get(ctxt->session) == GNUTLS_CRT_X509) {
[7921dc7]1414        mgs_add_common_cert_vars(r, ctxt->sc->certs_x509_crt_chain[0], 0,
1415                                 ctxt->sc->export_certificates_size);
[031acac]1416    }
[7bebb42]1417
[e183628]1418    return rv;
[c301152]1419}
1420
[e24e3bf9]1421int mgs_hook_authz(request_rec *r)
1422{
[e183628]1423    if (r == NULL)
1424        return DECLINED;
1425
[e24e3bf9]1426    mgs_dirconf_rec *dc = ap_get_module_config(
1427        r->per_dir_config, &gnutls_module);
[e183628]1428
[e24e3bf9]1429    mgs_handle_t *ctxt = get_effective_gnutls_ctxt(r->connection);
[e183628]1430    if (!ctxt || ctxt->session == NULL) {
1431        return DECLINED;
1432    }
1433
[e24e3bf9]1434    /* The effective verify mode. Directory configuration takes
1435     * precedence if present (-1 means it is unset). */
1436    int client_verify_mode = ctxt->sc->client_verify_mode;
1437    if (dc->client_verify_mode != -1)
1438        client_verify_mode = dc->client_verify_mode;
1439
[f94938c]1440    char *verify_mode;
1441    if (client_verify_mode == GNUTLS_CERT_IGNORE)
1442        verify_mode = "ignore";
1443    else if (client_verify_mode == GNUTLS_CERT_REQUEST)
1444        verify_mode = "request";
1445    else if (client_verify_mode == GNUTLS_CERT_REQUIRE)
1446        verify_mode = "require";
1447    else
1448        verify_mode = "(undefined)";
1449    ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1450                  "%s: verify mode is \"%s\"", __func__, verify_mode);
1451
[e24e3bf9]1452    if (client_verify_mode == GNUTLS_CERT_IGNORE)
1453    {
1454        return DECLINED;
1455    }
[e183628]1456
[e24e3bf9]1457    /* At this point the verify mode is either request or require */
1458    unsigned int cert_list_size;
1459    const gnutls_datum_t *cert_list =
1460        gnutls_certificate_get_peers(ctxt->session, &cert_list_size);
[346c03b]1461
[6fa6095]1462    /* We can reauthenticate the client if using TLS 1.3 and the
1463     * client annouced support. Note that there may still not be any
1464     * client certificate after. */
1465    if ((cert_list == NULL || cert_list_size == 0)
1466        && gnutls_protocol_get_version(ctxt->session) == GNUTLS_TLS1_3
1467        && (gnutls_session_get_flags(ctxt->session)
1468            & GNUTLS_SFLAGS_POST_HANDSHAKE_AUTH))
1469    {
[e24e3bf9]1470        ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
[f94938c]1471                      "%s: No certificate, attempting post-handshake "
1472                      "authentication (%d)",
[e24e3bf9]1473                      __func__, client_verify_mode);
[e183628]1474
[e24e3bf9]1475        if (r->proto_num == HTTP_VERSION(2, 0))
[5a8a32b]1476        {
[e24e3bf9]1477            ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1478                          "Rehandshake is prohibited for HTTP/2 "
1479                          "(RFC 7540, section 9.2.1).");
1480
1481            /* This also applies to request mode, otherwise
1482             * per-directory request would never work with HTTP/2. The
1483             * note makes mod_http2 send an HTTP_1_1_REQUIRED
1484             * error to tell the client to switch. */
1485            apr_table_setn(r->notes, RENEGOTIATE_FORBIDDEN_NOTE,
1486                           "verify-client");
1487            return HTTP_FORBIDDEN;
1488        }
1489
[4f2c988]1490        /* The request mode sent to the client is always "request"
1491         * because if reauth with "require" fails GnuTLS invalidates
1492         * the session, so we couldn't send 403 to the client. */
[e24e3bf9]1493        gnutls_certificate_server_set_request(ctxt->session,
[4f2c988]1494                                              GNUTLS_CERT_REQUEST);
[9db4dcd]1495        int rv = mgs_reauth(ctxt, r);
1496        if (rv != GNUTLS_E_SUCCESS) {
1497            if (rv == GNUTLS_E_GOT_APPLICATION_DATA)
1498                return HTTP_REQUEST_ENTITY_TOO_LARGE;
1499            else
1500                return HTTP_FORBIDDEN;
[e183628]1501        }
1502    }
1503
[9db4dcd]1504    int ret = mgs_cert_verify(r, ctxt);
[e24e3bf9]1505    /* In "request" mode we always allow the request, otherwise the
1506     * verify result decides. */
1507    if (client_verify_mode == GNUTLS_CERT_REQUEST)
1508        return DECLINED;
[9db4dcd]1509    return ret;
[7bebb42]1510}
1511
1512/* variables that are not sent by default:
1513 *
1514 * SSL_CLIENT_CERT      string  PEM-encoded client certificate
1515 * SSL_SERVER_CERT      string  PEM-encoded client certificate
1516 */
[836c2f9]1517
[7d1ab49]1518/* @param side is either 0 for SERVER or 1 for CLIENT
[671b64f]1519 *
[2aaf4f5]1520 * @param export_cert_size (int) maximum size for environment variable
1521 * to use for the PEM-encoded certificate (0 means do not export)
[7bebb42]1522 */
[765cac2]1523#define MGS_SIDE(suffix) ((side==0) ? "SSL_SERVER" suffix : "SSL_CLIENT" suffix)
[e183628]1524
[fd82e59]1525static void mgs_add_common_cert_vars(request_rec * r, gnutls_x509_crt_t cert, int side, size_t export_cert_size) {
[e183628]1526    unsigned char sbuf[64]; /* buffer to hold serials */
1527    char buf[AP_IOBUFSIZE];
1528    const char *tmp;
1529    char *tmp2;
1530    size_t len;
[dff03fa]1531    int ret;
[e183628]1532
1533    if (r == NULL)
1534        return;
1535
1536    apr_table_t *env = r->subprocess_env;
1537
1538    _gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
[2aaf4f5]1539    if (export_cert_size > 0) {
1540        len = 0;
1541        ret = gnutls_x509_crt_export(cert, GNUTLS_X509_FMT_PEM, NULL, &len);
1542        if (ret == GNUTLS_E_SHORT_MEMORY_BUFFER) {
1543            if (len >= export_cert_size) {
[765cac2]1544                apr_table_setn(env, MGS_SIDE("_CERT"), "GNUTLS_CERTIFICATE_SIZE_LIMIT_EXCEEDED");
[2aaf4f5]1545                ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1546                              "GnuTLS: Failed to export too-large X.509 certificate to environment");
1547            } else {
1548                char* cert_buf = apr_palloc(r->pool, len + 1);
1549                if (cert_buf != NULL && gnutls_x509_crt_export(cert, GNUTLS_X509_FMT_PEM, cert_buf, &len) >= 0) {
1550                    cert_buf[len] = 0;
[765cac2]1551                    apr_table_setn(env, MGS_SIDE("_CERT"), cert_buf);
[2aaf4f5]1552                } else {
1553                    ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r,
1554                                  "GnuTLS: failed to export X.509 certificate");
1555                }
1556            }
1557        } else {
1558            ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r,
1559                          "GnuTLS: dazed and confused about X.509 certificate size");
1560        }
[7d1ab49]1561    }
[671b64f]1562
[e183628]1563    len = sizeof (buf);
1564    gnutls_x509_crt_get_dn(cert, buf, &len);
[765cac2]1565    apr_table_setn(env, MGS_SIDE("_S_DN"), apr_pstrmemdup(r->pool, buf, len));
[e183628]1566
1567    len = sizeof (buf);
1568    gnutls_x509_crt_get_issuer_dn(cert, buf, &len);
[765cac2]1569    apr_table_setn(env, MGS_SIDE("_I_DN"), apr_pstrmemdup(r->pool, buf, len));
[e183628]1570
1571    len = sizeof (sbuf);
1572    gnutls_x509_crt_get_serial(cert, sbuf, &len);
[f450ac9]1573    apr_table_setn(env, MGS_SIDE("_M_SERIAL"),
1574                   apr_pescape_hex(r->pool, sbuf, len, 0));
[e183628]1575
1576    ret = gnutls_x509_crt_get_version(cert);
1577    if (ret > 0)
[765cac2]1578        apr_table_setn(env, MGS_SIDE("_M_VERSION"),
1579                       apr_psprintf(r->pool, "%u", ret));
[e183628]1580
[765cac2]1581    apr_table_setn(env, MGS_SIDE("_CERT_TYPE"), "X.509");
[e183628]1582
1583    tmp =
1584            mgs_time2sz(gnutls_x509_crt_get_expiration_time
1585            (cert), buf, sizeof (buf));
[765cac2]1586    apr_table_setn(env, MGS_SIDE("_V_END"), apr_pstrdup(r->pool, tmp));
[e183628]1587
1588    tmp =
1589            mgs_time2sz(gnutls_x509_crt_get_activation_time
1590            (cert), buf, sizeof (buf));
[765cac2]1591    apr_table_setn(env, MGS_SIDE("_V_START"), apr_pstrdup(r->pool, tmp));
[e183628]1592
1593    ret = gnutls_x509_crt_get_signature_algorithm(cert);
1594    if (ret >= 0) {
[765cac2]1595        apr_table_setn(env, MGS_SIDE("_A_SIG"),
[e183628]1596                gnutls_sign_algorithm_get_name(ret));
1597    }
1598
1599    ret = gnutls_x509_crt_get_pk_algorithm(cert, NULL);
1600    if (ret >= 0) {
[765cac2]1601        apr_table_setn(env, MGS_SIDE("_A_KEY"),
[e183628]1602                gnutls_pk_algorithm_get_name(ret));
1603    }
1604
1605    /* export all the alternative names (DNS, RFC822 and URI) */
[dff03fa]1606    for (int i = 0; !(ret < 0); i++)
1607    {
[e183628]1608        len = 0;
1609        ret = gnutls_x509_crt_get_subject_alt_name(cert, i,
1610                NULL, &len,
1611                NULL);
1612
1613        if (ret == GNUTLS_E_SHORT_MEMORY_BUFFER && len > 1) {
1614            tmp2 = apr_palloc(r->pool, len + 1);
1615
1616            ret =
1617                    gnutls_x509_crt_get_subject_alt_name(cert, i,
1618                    tmp2,
1619                    &len,
1620                    NULL);
1621            tmp2[len] = 0;
1622
[d54572e]1623            const char *san, *sanlabel;
[765cac2]1624            sanlabel = apr_psprintf(r->pool, "%s%u", MGS_SIDE("_S_AN"), i);
[e183628]1625            if (ret == GNUTLS_SAN_DNSNAME) {
[765cac2]1626                san = apr_psprintf(r->pool, "DNSNAME:%s", tmp2);
[e183628]1627            } else if (ret == GNUTLS_SAN_RFC822NAME) {
[765cac2]1628                san = apr_psprintf(r->pool, "RFC822NAME:%s", tmp2);
[e183628]1629            } else if (ret == GNUTLS_SAN_URI) {
[765cac2]1630                san = apr_psprintf(r->pool, "URI:%s", tmp2);
[e183628]1631            } else {
[765cac2]1632                san = "UNSUPPORTED";
[e183628]1633            }
[765cac2]1634            apr_table_setn(env, sanlabel, san);
[e183628]1635        }
1636    }
[e5bbda4]1637}
[7bebb42]1638
[7d1ab49]1639
[e5bbda4]1640
[2b3a248b]1641/* TODO: Allow client sending a X.509 certificate chain */
[e183628]1642static int mgs_cert_verify(request_rec * r, mgs_handle_t * ctxt) {
1643    const gnutls_datum_t *cert_list;
[99f8375]1644    unsigned int cert_list_size;
1645    /* assume the certificate is invalid unless explicitly set
1646     * otherwise */
1647    unsigned int status = GNUTLS_CERT_INVALID;
[e183628]1648    int rv = GNUTLS_E_NO_CERTIFICATE_FOUND, ret;
1649    unsigned int ch_size = 0;
1650
[7921dc7]1651    // TODO: union no longer needed here after removing its "pgp" component.
[e183628]1652    union {
1653        gnutls_x509_crt_t x509[MAX_CHAIN_SIZE];
1654    } cert;
1655    apr_time_t expiration_time, cur_time;
1656
1657    if (r == NULL || ctxt == NULL || ctxt->session == NULL)
1658        return HTTP_FORBIDDEN;
1659
1660    _gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
1661    cert_list =
1662            gnutls_certificate_get_peers(ctxt->session, &cert_list_size);
1663
1664    if (cert_list == NULL || cert_list_size == 0) {
1665        /* It is perfectly OK for a client not to send a certificate if on REQUEST mode
1666         */
1667        if (ctxt->sc->client_verify_mode == GNUTLS_CERT_REQUEST)
[0dc1a31]1668            return DECLINED;
[e183628]1669
1670        /* no certificate provided by the client, but one was required. */
1671        ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1672                "GnuTLS: Failed to Verify Peer: "
1673                "Client did not submit a certificate");
1674        return HTTP_FORBIDDEN;
1675    }
1676
1677    if (gnutls_certificate_type_get(ctxt->session) == GNUTLS_CRT_X509) {
1678        ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1679                "GnuTLS: A Chain of %d certificate(s) was provided for validation",
1680                cert_list_size);
1681
1682        for (ch_size = 0; ch_size < cert_list_size; ch_size++) {
1683            gnutls_x509_crt_init(&cert.x509[ch_size]);
1684            rv = gnutls_x509_crt_import(cert.x509[ch_size],
1685                    &cert_list[ch_size],
1686                    GNUTLS_X509_FMT_DER);
1687            // When failure to import, leave the loop
1688            if (rv != GNUTLS_E_SUCCESS) {
1689                if (ch_size < 1) {
1690                    ap_log_rerror(APLOG_MARK,
1691                            APLOG_INFO, 0, r,
1692                            "GnuTLS: Failed to Verify Peer: "
1693                            "Failed to import peer certificates.");
1694                    ret = HTTP_FORBIDDEN;
1695                    goto exit;
1696                }
1697                ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1698                        "GnuTLS: Failed to import some peer certificates. Using %d certificates",
1699                        ch_size);
1700                rv = GNUTLS_E_SUCCESS;
1701                break;
1702            }
1703        }
1704    } else
1705        return HTTP_FORBIDDEN;
1706
1707    if (rv < 0) {
1708        ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1709                "GnuTLS: Failed to Verify Peer: "
1710                "Failed to import peer certificates.");
1711        ret = HTTP_FORBIDDEN;
1712        goto exit;
1713    }
1714
1715    if (gnutls_certificate_type_get(ctxt->session) == GNUTLS_CRT_X509) {
1716        apr_time_ansi_put(&expiration_time,
1717                gnutls_x509_crt_get_expiration_time
1718                (cert.x509[0]));
1719
1720        ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
[5c0d491]1721                      "GnuTLS: Verifying list of %d certificate(s) via method '%s'",
1722                      ch_size, mgs_readable_cvm(ctxt->sc->client_verify_method));
1723        switch(ctxt->sc->client_verify_method) {
1724        case mgs_cvm_cartel:
1725            rv = gnutls_x509_crt_list_verify(cert.x509, ch_size,
1726                                             ctxt->sc->ca_list,
1727                                             ctxt->sc->ca_list_size,
1728                                             NULL, 0, 0, &status);
1729            break;
1730#ifdef ENABLE_MSVA
1731        case mgs_cvm_msva:
1732        {
[a01f8ab]1733            struct msv_response* resp = NULL;
1734            struct msv_query q = { .context="https", .peertype="client", .pkctype="x509pem" };
1735            msv_ctxt_t ctx = msv_ctxt_init(NULL);
[5c0d491]1736            char cert_pem_buf[10 * 1024];
1737            size_t len = sizeof (cert_pem_buf);
1738
1739            if (gnutls_x509_crt_export(cert.x509[0], GNUTLS_X509_FMT_PEM, cert_pem_buf, &len) >= 0) {
1740                /* FIXME : put together a name from the cert we received, instead of hard-coding this value: */
[a01f8ab]1741                q.peername = mgs_x509_construct_uid(r, cert.x509[0]);
1742                q.pkcdata = cert_pem_buf;
1743                rv = msv_query_agent(ctx, q, &resp);
[5c0d491]1744                if (rv == LIBMSV_ERROR_SUCCESS) {
1745                    status = 0;
1746                } else if (rv == LIBMSV_ERROR_INVALID) {
1747                    ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
[a01f8ab]1748                                  "GnuTLS: Monkeysphere validation failed: (message: %s)", resp->message);
[5c0d491]1749                    status = GNUTLS_CERT_INVALID;
1750                } else {
1751                    ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
[a01f8ab]1752                                  "GnuTLS: Error communicating with the Monkeysphere Validation Agent: (%d) %s", rv, msv_strerror(ctx, rv));
[5c0d491]1753                    status = GNUTLS_CERT_INVALID;
1754                    rv = -1;
[671b64f]1755                }
[5c0d491]1756            } else {
1757                ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1758                              "GnuTLS: Could not convert the client certificate to PEM format");
1759                status = GNUTLS_CERT_INVALID;
1760                rv = GNUTLS_E_ASN1_ELEMENT_NOT_FOUND;
1761            }
[a01f8ab]1762            msv_response_destroy(resp);
1763            msv_ctxt_destroy(ctx);
[5c0d491]1764        }
1765            break;
1766#endif
1767        default:
[99f8375]1768            /* If this block is reached, that indicates a
1769             * configuration error or bug in mod_gnutls (invalid value
1770             * of ctxt->sc->client_verify_method). */
[5c0d491]1771            ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1772                          "GnuTLS: Failed to Verify X.509 Peer: method '%s' is not supported",
1773                          mgs_readable_cvm(ctxt->sc->client_verify_method));
[99f8375]1774            rv = GNUTLS_E_UNIMPLEMENTED_FEATURE;
[5c0d491]1775        }
[671b64f]1776
[e183628]1777    } else {
[7921dc7]1778        /* Unknown certificate type */
1779        rv = GNUTLS_E_UNIMPLEMENTED_FEATURE;
[e183628]1780    }
1781
[99f8375]1782    /* "goto exit" at the end of this block skips evaluation of the
1783     * "status" variable */
[e183628]1784    if (rv < 0) {
1785        ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1786                "GnuTLS: Failed to Verify Peer certificate: (%d) %s",
1787                rv, gnutls_strerror(rv));
1788        if (rv == GNUTLS_E_NO_CERTIFICATE_FOUND)
1789            ap_log_rerror(APLOG_MARK, APLOG_EMERG, 0, r,
[7921dc7]1790                "GnuTLS: No certificate was found for verification. Did you set the GnuTLSClientCAFile directive?");
[e183628]1791        ret = HTTP_FORBIDDEN;
1792        goto exit;
1793    }
1794
1795    /* TODO: X509 CRL Verification. */
1796    /* May add later if anyone needs it.
1797     */
1798    /* ret = gnutls_x509_crt_check_revocation(crt, crl_list, crl_list_size); */
1799
1800    cur_time = apr_time_now();
1801
[3b2edd6]1802    if (status != 0) {
1803        gnutls_datum_t errmsg;
1804        gnutls_certificate_verification_status_print(
1805            status, gnutls_certificate_type_get(ctxt->session),
1806            &errmsg, 0);
[e183628]1807        ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
[3b2edd6]1808                      "Client authentication failed: %s", errmsg.data);
1809        gnutls_free(errmsg.data);
[e183628]1810    }
1811
[7921dc7]1812    mgs_add_common_cert_vars(r, cert.x509[0], 1, ctxt->sc->export_certificates_size);
[e183628]1813
1814    {
1815        /* days remaining */
1816        unsigned long remain =
1817                (apr_time_sec(expiration_time) -
1818                apr_time_sec(cur_time)) / 86400;
1819        apr_table_setn(r->subprocess_env, "SSL_CLIENT_V_REMAIN",
1820                apr_psprintf(r->pool, "%lu", remain));
1821    }
1822
1823    if (status == 0) {
1824        apr_table_setn(r->subprocess_env, "SSL_CLIENT_VERIFY",
1825                "SUCCESS");
[0dc1a31]1826        ret = DECLINED;
[e183628]1827    } else {
1828        apr_table_setn(r->subprocess_env, "SSL_CLIENT_VERIFY",
1829                "FAILED");
1830        if (ctxt->sc->client_verify_mode == GNUTLS_CERT_REQUEST)
[ee2854b]1831            ret = DECLINED;
[e183628]1832        else
1833            ret = HTTP_FORBIDDEN;
1834    }
1835
1836exit:
[dff03fa]1837    if (gnutls_certificate_type_get(ctxt->session) == GNUTLS_CRT_X509)
1838        for (unsigned int i = 0; i < ch_size; i++)
[e183628]1839            gnutls_x509_crt_deinit(cert.x509[i]);
[7921dc7]1840
[e183628]1841    return ret;
[dff03fa]1842}
[7bebb42]1843
1844
[832182b]1845
[fd82e59]1846#ifdef ENABLE_MSVA
1847/* this section of code is used only when trying to talk to the MSVA */
[832182b]1848static const char* mgs_x509_leaf_oid_from_dn(apr_pool_t *pool, const char* oid, gnutls_x509_crt_t cert) {
1849    int rv=GNUTLS_E_SUCCESS, i;
1850    size_t sz=0, lastsz=0;
1851    char* data=NULL;
1852
1853    i = -1;
1854    while(rv != GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
1855        i++;
1856        lastsz=sz;
1857        sz=0;
1858        rv = gnutls_x509_crt_get_dn_by_oid (cert, oid, i, 0, NULL, &sz);
1859    }
1860    if (i > 0) {
1861        data = apr_palloc(pool, lastsz);
1862        sz=lastsz;
1863        rv = gnutls_x509_crt_get_dn_by_oid (cert, oid, i-1, 0, data, &sz);
1864        if (rv == GNUTLS_E_SUCCESS)
1865            return data;
1866    }
1867    return NULL;
1868}
1869
1870static const char* mgs_x509_first_type_from_san(apr_pool_t *pool, gnutls_x509_subject_alt_name_t target, gnutls_x509_crt_t cert) {
1871    int rv=GNUTLS_E_SUCCESS;
1872    size_t sz;
1873    char* data=NULL;
1874    unsigned int i;
1875    gnutls_x509_subject_alt_name_t thistype;
1876
1877    i = 0;
1878    while(rv != GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
1879        sz = 0;
1880        rv = gnutls_x509_crt_get_subject_alt_name2(cert, i, NULL, &sz, &thistype, NULL);
1881        if (rv == GNUTLS_E_SHORT_MEMORY_BUFFER && thistype == target) {
1882            data = apr_palloc(pool, sz);
1883            rv = gnutls_x509_crt_get_subject_alt_name2(cert, i, data, &sz, &thistype, NULL);
[fd82e59]1884            if (rv >=0 && (thistype == target))
[832182b]1885                return data;
1886        }
1887        i++;
1888    }
1889    return NULL;
1890}
1891
[fd82e59]1892
[832182b]1893/* Create a string representing a candidate User ID from an X.509
1894 * certificate
1895
1896 * We need this for client certification because a client gives us a
1897 * certificate, but doesn't tell us (in any other way) who they are
1898 * trying to authenticate as.
1899
1900 * one complaint might be "but the user wanted to be another identity,
1901 * which is also in the certificate (e.g. in a SubjectAltName)"
1902 * However, given that any user can regenerate their own X.509
1903 * certificate with their own public key content, they should just do
1904 * so, and not expect us to guess at their identity :)
1905
1906 * This function allocates it's response from the pool given it.  When
1907 * that pool is reclaimed, the response will also be deallocated.
1908
1909 * FIXME: what about extracting a server-style cert
1910 *        (e.g. https://imposter.example) from the DN or any sAN?
1911
1912 * FIXME: what if we want to call this outside the context of a
1913 *        request?  That complicates the logging.
1914 */
1915static const char* mgs_x509_construct_uid(request_rec *r, gnutls_x509_crt_t cert) {
1916    /* basic strategy, assuming humans are the users: we are going to
1917     * try to reconstruct a "conventional" User ID by pulling in a
1918     * name, comment, and e-mail address.
1919     */
1920    apr_pool_t *pool = r->pool;
1921    const char *name=NULL, *comment=NULL, *email=NULL;
1922    const char *ret=NULL;
1923    /* subpool for temporary allocation: */
1924    apr_pool_t *sp=NULL;
1925
[671b64f]1926    if (APR_SUCCESS != apr_pool_create(&sp, pool))
[832182b]1927        return NULL; /* i'm assuming that libapr would log this kind
1928                      * of error on its own */
1929
1930     /* Name
[671b64f]1931
[832182b]1932     the name comes from the leaf commonName of the cert's Subject.
[671b64f]1933
[832182b]1934     (MAYBE: should we look at trying to assemble a candidate from
1935             givenName, surName, suffix, etc?  the "name" field
1936             appears to be case-insensitive, which seems problematic
1937             from what we expect; see:
1938             http://www.itu.int/rec/T-REC-X.520-200102-s/e )
1939
1940     (MAYBE: should we try pulling a commonName or otherName or
1941             something from subjectAltName? see:
1942             https://tools.ietf.org/html/rfc5280#section-4.2.1.6
1943             GnuTLS does not support looking for Common Names in the
1944             SAN yet)
1945     */
1946    name = mgs_x509_leaf_oid_from_dn(sp, GNUTLS_OID_X520_COMMON_NAME, cert);
1947
1948    /* Comment
1949
1950       I am inclined to punt on this for now, as Comment has been so
1951       atrociously misused in OpenPGP.  Perhaps if there is a
1952       pseudonym (OID 2.5.4.65, aka GNUTLS_OID_X520_PSEUDONYM) field
1953       in the subject or sAN?
1954    */
1955    comment = mgs_x509_leaf_oid_from_dn(sp, GNUTLS_OID_X520_PSEUDONYM, cert);
1956
1957    /* E-mail
1958
1959       This should be the the first rfc822Name from the sAN.
1960
[b55bf71]1961       failing that, we'll take the leaf email in the certificate's
1962       subject; this is a deprecated use though.
[832182b]1963     */
1964    email = mgs_x509_first_type_from_san(sp, GNUTLS_SAN_RFC822NAME, cert);
[b55bf71]1965    if (email == NULL)
1966        email = mgs_x509_leaf_oid_from_dn(sp, GNUTLS_OID_PKCS9_EMAIL, cert);
[832182b]1967
1968    /* assemble all the parts: */
1969
1970    /* must have at least a name or an e-mail. */
1971    if (name == NULL && email == NULL) {
1972        ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
1973                "GnuTLS: Need either a name or an e-mail address to get a User ID from an X.509 certificate.");
1974        goto end;
1975    }
1976    if (name) {
1977        if (comment) {
1978            if (email) {
1979                ret = apr_psprintf(pool, "%s (%s) <%s>", name, comment, email);
1980            } else {
1981                ret = apr_psprintf(pool, "%s (%s)", name, comment);
1982            }
1983        } else {
1984            if (email) {
1985                ret = apr_psprintf(pool, "%s <%s>", name, email);
1986            } else {
1987                ret = apr_pstrdup(pool, name);
1988            }
1989        }
1990    } else {
1991        if (comment) {
1992            ret = apr_psprintf(pool, "(%s) <%s>", comment, email);
1993        } else {
1994            ret = apr_psprintf(pool, "<%s>", email);
1995        }
1996    }
1997
1998end:
1999    apr_pool_destroy(sp);
2000    return ret;
2001}
[fd82e59]2002#endif /* ENABLE_MSVA */
[b4739cd]2003
2004
[bc539d5]2005
2006/*
2007 * This hook writes the mod_gnutls status message for a mod_status
2008 * report. According to the comments in mod_status.h, the "flags"
2009 * parameter is a bitwise OR of the AP_STATUS_ flags.
2010 *
2011 * Note that this implementation gives flags explicitly requesting a
2012 * simple response priority, e.g. if AP_STATUS_SHORT is set, flags
2013 * requesting an HTML report will be ignored. As of Apache 2.4.10, the
2014 * following flags were defined in mod_status.h:
2015 *
2016 * AP_STATUS_SHORT (short, non-HTML report requested)
2017 * AP_STATUS_NOTABLE (HTML report without tables)
2018 * AP_STATUS_EXTENDED (detailed report)
2019 */
2020static int mgs_status_hook(request_rec *r, int flags)
2021{
[b4739cd]2022    if (r == NULL)
2023        return OK;
2024
[bc539d5]2025    mgs_srvconf_rec *sc = (mgs_srvconf_rec *)
2026        ap_get_module_config(r->server->module_config, &gnutls_module);
[b4739cd]2027
2028    _gnutls_log(debug_log_fp, "%s: %d\n", __func__, __LINE__);
2029
[bc539d5]2030    if (flags & AP_STATUS_SHORT)
2031    {
2032        ap_rprintf(r, "Using GnuTLS version: %s\n", gnutls_check_version(NULL));
2033        ap_rputs("Built against GnuTLS version: " GNUTLS_VERSION "\n", r);
2034    }
2035    else
2036    {
2037        ap_rputs("<hr>\n", r);
2038        ap_rputs("<h2>GnuTLS Information:</h2>\n<dl>\n", r);
2039
2040        ap_rprintf(r, "<dt>Using GnuTLS version:</dt><dd>%s</dd>\n",
2041                   gnutls_check_version(NULL));
2042        ap_rputs("<dt>Built against GnuTLS version:</dt><dd>"
2043                 GNUTLS_VERSION "</dd>\n", r);
2044        ap_rprintf(r, "<dt>Using TLS:</dt><dd>%s</dd>\n",
2045                   (sc->enabled == GNUTLS_ENABLED_FALSE ? "no" : "yes"));
2046    }
[b4739cd]2047
[bc539d5]2048    if (sc->enabled != GNUTLS_ENABLED_FALSE)
2049    {
[2f10643]2050        mgs_handle_t* ctxt = get_effective_gnutls_ctxt(r->connection);
[600cf16]2051        if (ctxt && ctxt->session != NULL)
2052        {
[bc539d5]2053            char* s_info = gnutls_session_get_desc(ctxt->session);
2054            if (s_info)
2055            {
2056                if (flags & AP_STATUS_SHORT)
2057                    ap_rprintf(r, "Current TLS session: %s\n", s_info);
2058                else
2059                    ap_rprintf(r, "<dt>Current TLS session:</dt><dd>%s</dd>\n",
2060                               s_info);
2061                gnutls_free(s_info);
[b4739cd]2062            }
2063        }
2064    }
2065
[bc539d5]2066    if (!(flags & AP_STATUS_SHORT))
2067        ap_rputs("</dl>\n", r);
2068
[3aff94d]2069    if (sc->ocsp_cache)
2070        mgs_cache_status(sc->ocsp_cache, "GnuTLS OCSP Cache", r, flags);
2071    if (sc->cache_enable)
2072        mgs_cache_status(sc->cache, "GnuTLS Session Cache", r, flags);
2073
[b4739cd]2074    return OK;
2075}
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