4 Copyright (C) 2014 Simo Sorce <simo@redhat.com>
6 Permission is hereby granted, free of charge, to any person obtaining a
7 copy of this software and associated documentation files (the "Software"),
8 to deal in the Software without restriction, including without limitation
9 the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 and/or sell copies of the Software, and to permit persons to whom the
11 Software is furnished to do so, subject to the following conditions:
13 The above copyright notice and this permission notice shall be included in
14 all copies or substantial portions of the Software.
16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 DEALINGS IN THE SOFTWARE.
25 #include "mod_auth_gssapi.h"
27 const gss_OID_desc gss_mech_spnego = {
28 6, "\x2b\x06\x01\x05\x05\x02"
31 #ifdef HAVE_GSSAPI_GSSAPI_NTLMSSP_H
32 const gss_OID_desc gss_mech_ntlmssp_desc = {
33 GSS_NTLMSSP_OID_LENGTH, GSS_NTLMSSP_OID_STRING
35 gss_const_OID gss_mech_ntlmssp = &gss_mech_ntlmssp_desc;
37 const gss_OID_set_desc gss_mech_set_ntlmssp_desc = {
38 1, discard_const(&gss_mech_ntlmssp_desc)
40 gss_const_OID_set gss_mech_set_ntlmssp = &gss_mech_set_ntlmssp_desc;
43 gss_OID gss_mech_ntlmssp = GSS_C_NO_OID;
44 gss_OID_set gss_mech_set_ntlmssp = GSS_C_NO_OID_SET;
47 #define MOD_AUTH_GSSAPI_VERSION PACKAGE_NAME "/" PACKAGE_VERSION
49 module AP_MODULE_DECLARE_DATA auth_gssapi_module;
51 APLOG_USE_MODULE(auth_gssapi);
53 static char *mag_status(request_rec *req, int type, uint32_t err)
55 uint32_t maj_ret, min_ret;
64 maj_ret = gss_display_status(&min_ret, err, type,
65 GSS_C_NO_OID, &msg_ctx, &text);
66 if (maj_ret != GSS_S_COMPLETE) {
72 msg_ret = apr_psprintf(req->pool, "%s, %*s",
73 msg_ret, len, (char *)text.value);
75 msg_ret = apr_psprintf(req->pool, "%*s", len, (char *)text.value);
77 gss_release_buffer(&min_ret, &text);
78 } while (msg_ctx != 0);
83 char *mag_error(request_rec *req, const char *msg, uint32_t maj, uint32_t min)
88 msg_maj = mag_status(req, GSS_C_GSS_CODE, maj);
89 msg_min = mag_status(req, GSS_C_MECH_CODE, min);
90 return apr_psprintf(req->pool, "%s: [%s (%s)]", msg, msg_maj, msg_min);
93 static APR_OPTIONAL_FN_TYPE(ssl_is_https) *mag_is_https = NULL;
95 static int mag_post_config(apr_pool_t *cfgpool, apr_pool_t *log,
96 apr_pool_t *temp, server_rec *s)
98 /* FIXME: create mutex to deal with connections and contexts ? */
99 mag_is_https = APR_RETRIEVE_OPTIONAL_FN(ssl_is_https);
100 mag_post_config_session();
101 ap_add_version_component(cfgpool, MOD_AUTH_GSSAPI_VERSION);
106 static int mag_pre_connection(conn_rec *c, void *csd)
110 mc = mag_new_conn_ctx(c->pool);
111 mc->is_preserved = true;
112 ap_set_module_config(c->conn_config, &auth_gssapi_module, (void*)mc);
116 static apr_status_t mag_conn_destroy(void *ptr)
118 struct mag_conn *mc = (struct mag_conn *)ptr;
122 (void)gss_delete_sec_context(&min, &mc->ctx, GSS_C_NO_BUFFER);
127 struct mag_conn *mag_new_conn_ctx(apr_pool_t *pool)
131 mc = apr_pcalloc(pool, sizeof(struct mag_conn));
132 apr_pool_create(&mc->pool, pool);
133 /* register the context in the memory pool, so it can be freed
134 * when the connection/request is terminated */
135 apr_pool_cleanup_register(mc->pool, (void *)mc,
136 mag_conn_destroy, apr_pool_cleanup_null);
140 static void mag_conn_clear(struct mag_conn *mc)
142 (void)mag_conn_destroy(mc);
145 apr_pool_clear(mc->pool);
147 memset(mc, 0, sizeof(struct mag_conn));
151 static bool mag_conn_is_https(conn_rec *c)
154 if (mag_is_https(c)) return true;
160 static bool mag_acquire_creds(request_rec *req,
161 struct mag_config *cfg,
162 gss_OID_set desired_mechs,
163 gss_cred_usage_t cred_usage,
164 gss_cred_id_t *creds,
165 gss_OID_set *actual_mechs)
168 #ifdef HAVE_CRED_STORE
169 gss_const_key_value_set_t store = cfg->cred_store;
171 maj = gss_acquire_cred_from(&min, GSS_C_NO_NAME, GSS_C_INDEFINITE,
172 desired_mechs, cred_usage, store, creds,
175 maj = gss_acquire_cred(&min, GSS_C_NO_NAME, GSS_C_INDEFINITE,
176 desired_mechs, cred_usage, creds,
180 if (GSS_ERROR(maj)) {
181 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req, "%s",
182 mag_error(req, "gss_acquire_cred[_from]() "
183 "failed to get server creds",
191 #ifdef HAVE_CRED_STORE
192 static char *escape(apr_pool_t *pool, const char *name,
193 char find, const char *replace)
195 char *escaped = NULL;
200 namecopy = apr_pstrdup(pool, name);
202 p = strchr(namecopy, find);
203 if (!p) return namecopy;
208 /* terminate previous segment */
211 escaped = apr_pstrcat(pool, escaped, n, replace, NULL);
213 escaped = apr_pstrcat(pool, n, replace, NULL);
215 /* move to next segment */
219 /* append last segment if any */
221 escaped = apr_pstrcat(pool, escaped, n, NULL);
227 char *mag_gss_name_to_ccache_name(request_rec *req,
228 char *dir, const char *gss_name)
232 /* We need to escape away '/', we can't have path separators in
233 * a ccache file name */
234 /* first double escape the esacping char (~) if any */
235 escaped = escape(req->pool, gss_name, '~', "~~");
236 /* then escape away the separator (/) if any */
237 escaped = escape(req->pool, escaped, '/', "~");
239 return apr_psprintf(req->pool, "%s/%s", dir, escaped);
242 static void mag_store_deleg_creds(request_rec *req,
243 char *dir, const char *gss_name,
244 gss_cred_id_t delegated_cred)
246 gss_key_value_element_desc element;
247 gss_key_value_set_desc store;
250 element.key = "ccache";
251 store.elements = &element;
254 ccname = mag_gss_name_to_ccache_name(req, dir, gss_name);
255 element.value = apr_psprintf(req->pool, "FILE:%s", ccname);
257 maj = gss_store_cred_into(&min, delegated_cred, GSS_C_INITIATE,
258 GSS_C_NULL_OID, 1, 1, &store, NULL, NULL);
259 if (GSS_ERROR(maj)) {
260 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req, "%s",
261 mag_error(req, "failed to store delegated creds",
267 static bool parse_auth_header(apr_pool_t *pool, const char **auth_header,
270 char *auth_header_value;
272 auth_header_value = ap_getword_white(pool, auth_header);
273 if (!auth_header_value) return false;
274 value->length = apr_base64_decode_len(auth_header_value) + 1;
275 value->value = apr_pcalloc(pool, value->length);
276 if (!value->value) return false;
277 value->length = apr_base64_decode(value->value, auth_header_value);
282 static bool is_mech_allowed(gss_OID_set allowed_mechs, gss_const_OID mech,
283 bool multi_step_supported)
285 if (mech == GSS_C_NO_OID) return false;
287 if (!multi_step_supported && gss_oid_equal(gss_mech_ntlmssp, mech))
290 if (allowed_mechs == GSS_C_NO_OID_SET) return true;
292 for (int i = 0; i < allowed_mechs->count; i++) {
293 if (gss_oid_equal(&allowed_mechs->elements[i], mech)) {
300 #define AUTH_TYPE_NEGOTIATE 0
301 #define AUTH_TYPE_BASIC 1
302 #define AUTH_TYPE_RAW_NTLM 2
303 const char *auth_types[] = {
310 const char *mag_str_auth_type(int auth_type)
312 return auth_types[auth_type];
315 gss_OID_set mag_filter_unwanted_mechs(gss_OID_set src)
317 gss_const_OID unwanted_mechs[] = {
328 if (src == GSS_C_NO_OID_SET) return GSS_C_NO_OID_SET;
330 for (int i = 0; unwanted_mechs[i] != GSS_C_NO_OID; i++) {
331 maj = gss_test_oid_set_member(&min,
332 discard_const(unwanted_mechs[i]),
337 maj = gss_create_empty_oid_set(&min, &dst);
338 if (maj != GSS_S_COMPLETE) {
339 return GSS_C_NO_OID_SET;
341 for (int i = 0; i < src->count; i++) {
343 for (int j = 0; unwanted_mechs[j] != GSS_C_NO_OID; j++) {
344 if (gss_oid_equal(&src->elements[i], unwanted_mechs[j])) {
349 if (present) continue;
350 maj = gss_add_oid_set_member(&min, &src->elements[i], &dst);
351 if (maj != GSS_S_COMPLETE) {
352 gss_release_oid_set(&min, &dst);
353 return GSS_C_NO_OID_SET;
361 static bool mag_auth_basic(request_rec *req,
362 struct mag_config *cfg,
363 gss_buffer_desc ba_user,
364 gss_buffer_desc ba_pwd,
365 gss_cred_usage_t cred_usage,
368 gss_cred_id_t *delegated_cred,
371 #ifdef HAVE_GSS_KRB5_CCACHE_NAME
372 const char *user_ccache = NULL;
373 const char *orig_ccache = NULL;
374 long long unsigned int rndname;
377 gss_name_t user = GSS_C_NO_NAME;
378 gss_cred_id_t user_cred = GSS_C_NO_CREDENTIAL;
379 gss_ctx_id_t user_ctx = GSS_C_NO_CONTEXT;
380 gss_name_t server = GSS_C_NO_NAME;
381 gss_cred_id_t server_cred = GSS_C_NO_CREDENTIAL;
382 gss_ctx_id_t server_ctx = GSS_C_NO_CONTEXT;
383 gss_cred_id_t acquired_cred = GSS_C_NO_CREDENTIAL;
384 gss_buffer_desc input = GSS_C_EMPTY_BUFFER;
385 gss_buffer_desc output = GSS_C_EMPTY_BUFFER;
386 gss_OID_set allowed_mechs;
387 gss_OID_set filtered_mechs;
388 gss_OID_set actual_mechs = GSS_C_NO_OID_SET;
389 uint32_t init_flags = 0;
394 maj = gss_import_name(&min, &ba_user, GSS_C_NT_USER_NAME, &user);
395 if (GSS_ERROR(maj)) {
396 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
398 mag_error(req, "gss_import_name() failed",
403 if (cfg->basic_mechs) {
404 allowed_mechs = cfg->basic_mechs;
405 } else if (cfg->allowed_mechs) {
406 allowed_mechs = cfg->allowed_mechs;
408 struct mag_server_config *scfg;
409 /* Try to fetch the default set if not explicitly configured,
410 * We need to do this because gss_acquire_cred_with_password()
411 * is currently limited to acquire creds for a single "default"
412 * mechanism if no desired mechanisms are passed in. This causes
413 * authentication to fail for secondary mechanisms as no user
414 * credentials are generated for those. */
415 scfg = ap_get_module_config(req->server->module_config,
416 &auth_gssapi_module);
417 /* In the worst case scenario default_mechs equals to GSS_C_NO_OID_SET.
418 * This generally causes only the krb5 mechanism to be tried due
419 * to implementation constraints, but may change in future. */
420 allowed_mechs = scfg->default_mechs;
423 /* Remove Spnego if present, or we'd repeat failed authentiations
424 * multiple times, one within Spnego and then again with an explicit
425 * mechanism. We would normally just force Spnego and use
426 * gss_set_neg_mechs, but due to the way we source the server name
427 * and the fact MIT up to 1.14 at least does no handle union names,
428 * we can't provide spnego with a server name that can be used by
429 * multiple mechanisms, causing any but the first mechanism to fail.
430 * Also remove unwanted krb mechs, or AS requests will be repeated
431 * multiple times uselessly.
433 filtered_mechs = mag_filter_unwanted_mechs(allowed_mechs);
434 if (filtered_mechs == allowed_mechs) {
435 /* in case filtered_mechs was not allocated here don't free it */
436 filtered_mechs = GSS_C_NO_OID_SET;
437 } else if (filtered_mechs == GSS_C_NO_OID_SET) {
438 ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, req, "Fatal "
439 "failure while filtering mechs, aborting");
442 /* use the filtered list */
443 allowed_mechs = filtered_mechs;
446 #ifdef HAVE_GSS_KRB5_CCACHE_NAME
447 /* If we are using the krb5 mechanism make sure to set a per thread
448 * memory ccache so that there can't be interferences between threads.
449 * Also make sure we have new cache so no cached results end up being
450 * used. Some implementations of gss_acquire_cred_with_password() do
451 * not reacquire creds if cached ones are around, failing to check
452 * again for the password. */
453 maj = gss_test_oid_set_member(&min, discard_const(gss_mech_krb5),
454 allowed_mechs, &present);
455 if (GSS_ERROR(maj)) {
456 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
458 mag_error(req, "gss_test_oid_set_member() failed",
463 rs = apr_generate_random_bytes((unsigned char *)(&rndname),
464 sizeof(long long unsigned int));
465 if (rs != APR_SUCCESS) {
466 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
467 "Failed to generate random ccache name");
470 user_ccache = apr_psprintf(req->pool, "MEMORY:user_%qu", rndname);
471 maj = gss_krb5_ccache_name(&min, user_ccache, &orig_ccache);
472 if (GSS_ERROR(maj)) {
473 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
475 mag_error(req, "gss_krb5_ccache_name() "
476 "failed", maj, min));
482 maj = gss_acquire_cred_with_password(&min, user, &ba_pwd,
486 &user_cred, &actual_mechs, NULL);
487 if (GSS_ERROR(maj)) {
488 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
490 mag_error(req, "gss_acquire_cred_with_password() "
491 "failed", maj, min));
495 /* must acquire creds based on the actual mechs we want to try */
496 if (!mag_acquire_creds(req, cfg, actual_mechs,
497 cred_usage, &acquired_cred, NULL)) {
501 if (cred_usage == GSS_C_BOTH) {
502 /* must acquire with GSS_C_ACCEPT to get the server name */
503 if (!mag_acquire_creds(req, cfg, actual_mechs,
504 GSS_C_ACCEPT, &server_cred, NULL)) {
508 server_cred = acquired_cred;
511 #ifdef HAVE_CRED_STORE
512 if (cfg->deleg_ccache_dir) {
513 /* delegate ourselves credentials so we store them as requested */
514 init_flags |= GSS_C_DELEG_FLAG;
518 for (int i = 0; i < actual_mechs->count; i++) {
520 /* free these if looping */
521 gss_release_buffer(&min, &output);
522 gss_release_buffer(&min, &input);
523 gss_release_name(&min, &server);
525 maj = gss_inquire_cred_by_mech(&min, server_cred,
526 &actual_mechs->elements[i],
527 &server, NULL, NULL, NULL);
528 if (GSS_ERROR(maj)) {
529 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
530 "%s", mag_error(req, "gss_inquired_cred_by_mech() "
531 "failed", maj, min));
536 /* output and input are inverted here, this is intentional */
537 maj = gss_init_sec_context(&min, user_cred, &user_ctx, server,
538 &actual_mechs->elements[i], init_flags,
539 300, GSS_C_NO_CHANNEL_BINDINGS, &output,
540 NULL, &input, NULL, NULL);
541 if (GSS_ERROR(maj)) {
542 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
543 "%s", mag_error(req, "gss_init_sec_context() "
544 "failed", maj, min));
547 gss_release_buffer(&min, &output);
548 maj = gss_accept_sec_context(&min, &server_ctx, acquired_cred,
549 &input, GSS_C_NO_CHANNEL_BINDINGS,
550 client, mech_type, &output, NULL,
551 vtime, delegated_cred);
552 if (GSS_ERROR(maj)) {
553 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
554 "%s", mag_error(req, "gss_accept_sec_context()"
555 " failed", maj, min));
558 gss_release_buffer(&min, &input);
559 } while (maj == GSS_S_CONTINUE_NEEDED);
561 if (maj == GSS_S_COMPLETE) {
568 gss_release_buffer(&min, &output);
569 gss_release_buffer(&min, &input);
570 gss_release_name(&min, &server);
571 if (server_cred != acquired_cred)
572 gss_release_cred(&min, &server_cred);
573 gss_delete_sec_context(&min, &server_ctx, GSS_C_NO_BUFFER);
574 gss_release_cred(&min, &acquired_cred);
575 gss_release_name(&min, &user);
576 gss_release_cred(&min, &user_cred);
577 gss_delete_sec_context(&min, &user_ctx, GSS_C_NO_BUFFER);
578 gss_release_oid_set(&min, &actual_mechs);
579 gss_release_oid_set(&min, &filtered_mechs);
580 #ifdef HAVE_GSS_KRB5_CCACHE_NAME
581 if (user_ccache != NULL) {
582 maj = gss_krb5_ccache_name(&min, orig_ccache, NULL);
583 if (maj != GSS_S_COMPLETE) {
584 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
585 "Failed to restore per-thread ccache, %s",
586 mag_error(req, "gss_krb5_ccache_name() "
587 "failed", maj, min));
594 struct mag_req_cfg *mag_init_cfg(request_rec *req)
596 struct mag_server_config *scfg;
597 struct mag_req_cfg *req_cfg = apr_pcalloc(req->pool,
598 sizeof(struct mag_req_cfg));
600 req_cfg->cfg = ap_get_module_config(req->per_dir_config,
601 &auth_gssapi_module);
603 scfg = ap_get_module_config(req->server->module_config,
604 &auth_gssapi_module);
606 if (req_cfg->cfg->allowed_mechs) {
607 req_cfg->desired_mechs = req_cfg->cfg->allowed_mechs;
609 /* Use the default set if not explicitly configured */
610 req_cfg->desired_mechs = scfg->default_mechs;
613 if (req_cfg->cfg->mag_skey) {
614 req_cfg->mag_skey = req_cfg->cfg->mag_skey;
616 /* Use server random key if not explicitly configured */
617 req_cfg->mag_skey = scfg->mag_skey;
620 if (req->proxyreq == PROXYREQ_PROXY) {
621 req_cfg->req_proto = "Proxy-Authorization";
622 req_cfg->rep_proto = "Proxy-Authenticate";
624 req_cfg->req_proto = "Authorization";
625 req_cfg->rep_proto = "WWW-Authenticate";
626 req_cfg->use_sessions = req_cfg->cfg->use_sessions;
627 req_cfg->send_persist = req_cfg->cfg->send_persist;
633 static bool use_s4u2proxy(struct mag_req_cfg *req_cfg) {
634 if (req_cfg->cfg->use_s4u2proxy) {
635 if (req_cfg->cfg->deleg_ccache_dir != NULL) {
638 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req_cfg->req,
639 "S4U2 Proxy requested but GssapiDelegCcacheDir "
640 "is not set. Constrained delegation disabled!");
646 static int mag_auth(request_rec *req)
650 struct mag_req_cfg *req_cfg;
651 struct mag_config *cfg;
652 const char *auth_header;
653 char *auth_header_type;
654 int ret = HTTP_UNAUTHORIZED;
655 gss_ctx_id_t ctx = GSS_C_NO_CONTEXT;
657 gss_buffer_desc input = GSS_C_EMPTY_BUFFER;
658 gss_buffer_desc output = GSS_C_EMPTY_BUFFER;
659 gss_buffer_desc name = GSS_C_EMPTY_BUFFER;
660 gss_buffer_desc ba_user;
661 gss_buffer_desc ba_pwd;
662 gss_name_t client = GSS_C_NO_NAME;
663 gss_cred_id_t acquired_cred = GSS_C_NO_CREDENTIAL;
664 gss_cred_id_t delegated_cred = GSS_C_NO_CREDENTIAL;
665 gss_cred_usage_t cred_usage = GSS_C_ACCEPT;
670 gss_OID mech_type = GSS_C_NO_OID;
671 gss_OID_set desired_mechs = GSS_C_NO_OID_SET;
672 gss_buffer_desc lname = GSS_C_EMPTY_BUFFER;
673 struct mag_conn *mc = NULL;
676 type = ap_auth_type(req);
677 if ((type == NULL) || (strcasecmp(type, "GSSAPI") != 0)) {
681 req_cfg = mag_init_cfg(req);
685 desired_mechs = req_cfg->desired_mechs;
687 /* implicit auth for subrequests if main auth already happened */
688 if (!ap_is_initial_req(req) && req->main != NULL) {
689 type = ap_auth_type(req->main);
690 if ((type != NULL) && (strcasecmp(type, "GSSAPI") == 0)) {
691 /* warn if the subrequest location and the main request
692 * location have different configs */
693 if (cfg != ap_get_module_config(req->main->per_dir_config,
694 &auth_gssapi_module)) {
695 ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0,
696 req, "Subrequest authentication bypass on "
697 "location with different configuration!");
699 if (req->main->user) {
700 req->user = apr_pstrdup(req->pool, req->main->user);
703 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
704 "The main request is tasked to establish the "
705 "security context, can't proceed!");
706 return HTTP_UNAUTHORIZED;
709 ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, req,
710 "Subrequest GSSAPI auth with no auth on the main "
711 "request. This operation may fail if other "
712 "subrequests already established a context or the "
713 "mechanism requires multiple roundtrips.");
718 if (!mag_conn_is_https(req->connection)) {
719 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
720 "Not a TLS connection, refusing to authenticate!");
725 if (cfg->gss_conn_ctx) {
726 mc = (struct mag_conn *)ap_get_module_config(
727 req->connection->conn_config,
728 &auth_gssapi_module);
730 ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, req,
731 "Failed to retrieve connection context!");
736 /* if available, session always supersedes connection bound data */
737 if (req_cfg->use_sessions) {
738 mag_check_session(req_cfg, &mc);
741 auth_header = apr_table_get(req->headers_in, req_cfg->req_proto);
744 if (mc->established &&
745 (auth_header == NULL) &&
746 (mc->auth_type != AUTH_TYPE_BASIC)) {
747 ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, req,
748 "Already established context found!");
749 mag_set_req_data(req, cfg, mc);
755 /* no preserved mc, create one just for this request */
756 mc = mag_new_conn_ctx(req->pool);
760 /* We can proceed only if we do have an auth header */
761 if (!auth_header) goto done;
763 auth_header_type = ap_getword_white(req->pool, &auth_header);
764 if (!auth_header_type) goto done;
766 for (i = 0; auth_types[i] != NULL; i++) {
767 if (strcasecmp(auth_header_type, auth_types[i]) == 0) {
774 case AUTH_TYPE_NEGOTIATE:
775 if (!parse_auth_header(req->pool, &auth_header, &input)) {
779 case AUTH_TYPE_BASIC:
780 if (!cfg->use_basic_auth) {
784 ba_pwd.value = ap_pbase64decode(req->pool, auth_header);
785 if (!ba_pwd.value) goto done;
786 ba_user.value = ap_getword_nulls_nc(req->pool,
787 (char **)&ba_pwd.value, ':');
788 if (!ba_user.value) goto done;
790 if (((char *)ba_user.value)[0] == '\0' ||
791 ((char *)ba_pwd.value)[0] == '\0') {
792 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
793 "Invalid empty user or password for Basic Auth");
796 ba_user.length = strlen(ba_user.value);
797 ba_pwd.length = strlen(ba_pwd.value);
799 if (mc->is_preserved && mc->established &&
800 mag_basic_check(req_cfg, mc, ba_user, ba_pwd)) {
801 ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, req,
802 "Already established BASIC AUTH context found!");
803 mag_set_req_data(req, cfg, mc);
810 case AUTH_TYPE_RAW_NTLM:
811 if (!is_mech_allowed(desired_mechs, gss_mech_ntlmssp,
812 cfg->gss_conn_ctx)) {
813 ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, req,
814 "NTLM Authentication is not allowed!");
818 if (!parse_auth_header(req->pool, &auth_header, &input)) {
822 desired_mechs = discard_const(gss_mech_set_ntlmssp);
829 if (mc->established) {
830 /* if we are re-authenticating make sure the conn context
831 * is cleaned up so we do not accidentally reuse an existing
832 * established context */
836 mc->auth_type = auth_type;
838 #ifdef HAVE_CRED_STORE
839 if (use_s4u2proxy(req_cfg)) {
840 cred_usage = GSS_C_BOTH;
844 if (auth_type == AUTH_TYPE_BASIC) {
845 if (mag_auth_basic(req, cfg, ba_user, ba_pwd,
846 cred_usage, &client, &mech_type,
847 &delegated_cred, &vtime)) {
853 if (!mag_acquire_creds(req, cfg, desired_mechs,
854 cred_usage, &acquired_cred, NULL)) {
858 if (auth_type == AUTH_TYPE_NEGOTIATE &&
859 cfg->allowed_mechs != GSS_C_NO_OID_SET) {
860 maj = gss_set_neg_mechs(&min, acquired_cred, cfg->allowed_mechs);
861 if (GSS_ERROR(maj)) {
862 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req, "%s",
863 mag_error(req, "gss_set_neg_mechs() failed",
869 maj = gss_accept_sec_context(&min, pctx, acquired_cred,
870 &input, GSS_C_NO_CHANNEL_BINDINGS,
871 &client, &mech_type, &output, NULL, &vtime,
873 if (GSS_ERROR(maj)) {
874 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req, "%s",
875 mag_error(req, "gss_accept_sec_context() failed",
878 } else if (maj == GSS_S_CONTINUE_NEEDED) {
879 if (!mc->is_preserved) {
880 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
881 "Mechanism needs continuation but neither "
882 "GssapiConnectionBound nor "
883 "GssapiUseSessions are available");
884 gss_release_buffer(&min, &output);
887 /* auth not complete send token and wait next packet */
892 maj = gss_display_name(&min, client, &name, NULL);
893 if (GSS_ERROR(maj)) {
894 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req, "%s",
895 mag_error(req, "gss_display_name() failed",
900 mc->gss_name = apr_pstrndup(req->pool, name.value, name.length);
901 if (vtime == GSS_C_INDEFINITE || vtime < MIN_SESS_EXP_TIME) {
902 vtime = MIN_SESS_EXP_TIME;
904 mc->expiration = time(NULL) + vtime;
906 mag_get_name_attributes(req, cfg, client, mc);
908 #ifdef HAVE_CRED_STORE
909 if (cfg->deleg_ccache_dir && delegated_cred != GSS_C_NO_CREDENTIAL) {
910 mag_store_deleg_creds(req, cfg->deleg_ccache_dir, mc->gss_name,
912 mc->delegated = true;
916 if (cfg->map_to_local) {
917 maj = gss_localname(&min, client, mech_type, &lname);
918 if (maj != GSS_S_COMPLETE) {
919 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req, "%s",
920 mag_error(req, "gss_localname() failed", maj, min));
923 mc->user_name = apr_pstrndup(req->pool, lname.value, lname.length);
925 mc->user_name = apr_pstrdup(mc->pool, mc->gss_name);
928 mc->established = true;
929 if (auth_type == AUTH_TYPE_BASIC) {
930 mag_basic_cache(req_cfg, mc, ba_user, ba_pwd);
932 if (req_cfg->use_sessions) {
933 mag_attempt_session(req_cfg, mc);
936 /* Now set request data and env vars */
937 mag_set_req_data(req, cfg, mc);
939 if (req_cfg->send_persist)
940 apr_table_set(req->headers_out, "Persistent-Auth",
941 cfg->gss_conn_ctx ? "true" : "false");
947 if ((auth_type != AUTH_TYPE_BASIC) && (output.length != 0)) {
948 int prefixlen = strlen(mag_str_auth_type(auth_type)) + 1;
949 replen = apr_base64_encode_len(output.length) + 1;
950 reply = apr_pcalloc(req->pool, prefixlen + replen);
952 memcpy(reply, mag_str_auth_type(auth_type), prefixlen - 1);
953 reply[prefixlen - 1] = ' ';
954 apr_base64_encode(&reply[prefixlen], output.value, output.length);
955 apr_table_add(req->err_headers_out, req_cfg->rep_proto, reply);
957 } else if (ret == HTTP_UNAUTHORIZED) {
958 apr_table_add(req->err_headers_out, req_cfg->rep_proto, "Negotiate");
960 if (is_mech_allowed(desired_mechs, gss_mech_ntlmssp,
961 cfg->gss_conn_ctx)) {
962 apr_table_add(req->err_headers_out, req_cfg->rep_proto, "NTLM");
964 if (cfg->use_basic_auth) {
965 apr_table_add(req->err_headers_out, req_cfg->rep_proto,
966 apr_psprintf(req->pool, "Basic realm=\"%s\"",
971 if (ctx != GSS_C_NO_CONTEXT)
972 gss_delete_sec_context(&min, &ctx, GSS_C_NO_BUFFER);
973 gss_release_cred(&min, &acquired_cred);
974 gss_release_cred(&min, &delegated_cred);
975 gss_release_buffer(&min, &output);
976 gss_release_name(&min, &client);
977 gss_release_buffer(&min, &name);
978 gss_release_buffer(&min, &lname);
983 static void *mag_create_dir_config(apr_pool_t *p, char *dir)
985 struct mag_config *cfg;
987 cfg = (struct mag_config *)apr_pcalloc(p, sizeof(struct mag_config));
993 static const char *mag_ssl_only(cmd_parms *parms, void *mconfig, int on)
995 struct mag_config *cfg = (struct mag_config *)mconfig;
996 cfg->ssl_only = on ? true : false;
1000 static const char *mag_map_to_local(cmd_parms *parms, void *mconfig, int on)
1002 struct mag_config *cfg = (struct mag_config *)mconfig;
1003 cfg->map_to_local = on ? true : false;
1007 static const char *mag_conn_ctx(cmd_parms *parms, void *mconfig, int on)
1009 struct mag_config *cfg = (struct mag_config *)mconfig;
1010 cfg->gss_conn_ctx = on ? true : false;
1014 static const char *mag_send_persist(cmd_parms *parms, void *mconfig, int on)
1016 struct mag_config *cfg = (struct mag_config *)mconfig;
1017 cfg->send_persist = on ? true : false;
1021 static const char *mag_use_sess(cmd_parms *parms, void *mconfig, int on)
1023 struct mag_config *cfg = (struct mag_config *)mconfig;
1024 cfg->use_sessions = on ? true : false;
1028 #ifdef HAVE_CRED_STORE
1029 static const char *mag_use_s4u2p(cmd_parms *parms, void *mconfig, int on)
1031 struct mag_config *cfg = (struct mag_config *)mconfig;
1032 cfg->use_s4u2proxy = on ? true : false;
1038 static const char *mag_sess_key(cmd_parms *parms, void *mconfig, const char *w)
1040 struct mag_config *cfg = (struct mag_config *)mconfig;
1041 struct databuf keys;
1047 if (strncmp(w, "key:", 4) != 0) {
1048 ap_log_error(APLOG_MARK, APLOG_ERR, 0, parms->server,
1049 "Invalid key format, expected prefix 'key:'");
1054 l = apr_base64_decode_len(k);
1055 val = apr_palloc(parms->temp_pool, l);
1057 keys.length = (int)apr_base64_decode_binary(val, k);
1058 keys.value = (unsigned char *)val;
1060 if (keys.length != 32) {
1061 ap_log_error(APLOG_MARK, APLOG_ERR, 0, parms->server,
1062 "Invalid key length, expected 32 got %d", keys.length);
1066 rc = SEAL_KEY_CREATE(cfg->pool, &cfg->mag_skey, &keys);
1068 ap_log_error(APLOG_MARK, APLOG_ERR, 0, parms->server,
1069 "Failed to import sealing key!");
1074 #ifdef HAVE_CRED_STORE
1076 #define MAX_CRED_OPTIONS 10
1078 static const char *mag_cred_store(cmd_parms *parms, void *mconfig,
1081 struct mag_config *cfg = (struct mag_config *)mconfig;
1082 gss_key_value_element_desc *elements;
1091 ap_log_error(APLOG_MARK, APLOG_ERR, 0, parms->server,
1092 "%s [%s]", "Invalid syntax for GssapiCredStore option", w);
1096 key = apr_pstrndup(parms->pool, w, (p-w));
1097 value = apr_pstrdup(parms->pool, p + 1);
1099 if (!cfg->cred_store) {
1100 cfg->cred_store = apr_pcalloc(parms->pool,
1101 sizeof(gss_key_value_set_desc));
1102 size = sizeof(gss_key_value_element_desc) * MAX_CRED_OPTIONS;
1103 cfg->cred_store->elements = apr_palloc(parms->pool, size);
1106 elements = cfg->cred_store->elements;
1107 count = cfg->cred_store->count;
1109 if (count >= MAX_CRED_OPTIONS) {
1110 ap_log_error(APLOG_MARK, APLOG_ERR, 0, parms->server,
1111 "Too many GssapiCredStore options (MAX: %d)",
1115 cfg->cred_store->count++;
1117 elements[count].key = key;
1118 elements[count].value = value;
1123 static const char *mag_deleg_ccache_dir(cmd_parms *parms, void *mconfig,
1126 struct mag_config *cfg = (struct mag_config *)mconfig;
1128 cfg->deleg_ccache_dir = apr_pstrdup(parms->pool, value);
1134 #ifdef HAVE_GSS_ACQUIRE_CRED_WITH_PASSWORD
1135 static const char *mag_use_basic_auth(cmd_parms *parms, void *mconfig, int on)
1137 struct mag_config *cfg = (struct mag_config *)mconfig;
1139 cfg->use_basic_auth = on ? true : false;
1144 static apr_status_t mag_oid_set_destroy(void *ptr)
1147 gss_OID_set set = (gss_OID_set)ptr;
1148 (void)gss_release_oid_set(&min, &set);
1152 static bool mag_list_of_mechs(cmd_parms *parms, gss_OID_set *oidset,
1153 bool add_spnego, const char *w)
1155 gss_buffer_desc buf = { 0 };
1159 bool release_oid = false;
1161 if (NULL == *oidset) {
1162 maj = gss_create_empty_oid_set(&min, &set);
1163 if (maj != GSS_S_COMPLETE) {
1164 ap_log_error(APLOG_MARK, APLOG_ERR, 0, parms->server,
1165 "gss_create_empty_oid_set() failed.");
1166 *oidset = GSS_C_NO_OID_SET;
1170 oid = discard_const(&gss_mech_spnego);
1171 maj = gss_add_oid_set_member(&min, oid, &set);
1172 if (maj != GSS_S_COMPLETE) {
1173 ap_log_error(APLOG_MARK, APLOG_ERR, 0, parms->server,
1174 "gss_add_oid_set_member() failed.");
1175 (void)gss_release_oid_set(&min, &set);
1176 *oidset = GSS_C_NO_OID_SET;
1180 /* register in the pool so it can be released once the server
1182 apr_pool_cleanup_register(parms->pool, (void *)set,
1183 mag_oid_set_destroy,
1184 apr_pool_cleanup_null);
1190 if (strcmp(w, "krb5") == 0) {
1191 oid = discard_const(gss_mech_krb5);
1192 } else if (strcmp(w, "iakerb") == 0) {
1193 oid = discard_const(gss_mech_iakerb);
1194 } else if (strcmp(w, "ntlmssp") == 0) {
1195 oid = discard_const(gss_mech_ntlmssp);
1197 buf.value = discard_const(w);
1198 buf.length = strlen(w);
1199 maj = gss_str_to_oid(&min, &buf, &oid);
1200 if (maj != GSS_S_COMPLETE) {
1201 ap_log_error(APLOG_MARK, APLOG_ERR, 0, parms->server,
1202 "Unrecognized GSSAPI Mechanism: [%s]", w);
1207 maj = gss_add_oid_set_member(&min, oid, &set);
1208 if (maj != GSS_S_COMPLETE) {
1209 ap_log_error(APLOG_MARK, APLOG_ERR, 0, parms->server,
1210 "gss_add_oid_set_member() failed for [%s].", w);
1213 (void)gss_release_oid(&min, &oid);
1219 static const char *mag_allow_mech(cmd_parms *parms, void *mconfig,
1222 struct mag_config *cfg = (struct mag_config *)mconfig;
1224 if (!mag_list_of_mechs(parms, &cfg->allowed_mechs, true, w))
1225 return "Failed to apply GssapiAllowedMech directive";
1230 #define GSS_NAME_ATTR_USERDATA "GSS Name Attributes Userdata"
1232 static apr_status_t mag_name_attrs_cleanup(void *data)
1234 struct mag_config *cfg = (struct mag_config *)data;
1235 free(cfg->name_attributes);
1236 cfg->name_attributes = NULL;
1240 static const char *mag_name_attrs(cmd_parms *parms, void *mconfig,
1243 struct mag_config *cfg = (struct mag_config *)mconfig;
1249 if (!cfg->name_attributes) {
1250 size = sizeof(struct mag_name_attributes)
1251 + (sizeof(struct mag_na_map) * 16);
1252 } else if (cfg->name_attributes->map_count % 16 == 0) {
1253 size = sizeof(struct mag_name_attributes)
1254 + (sizeof(struct mag_na_map)
1255 * (cfg->name_attributes->map_count + 16));
1258 tmp_na = realloc(cfg->name_attributes, size);
1259 if (!tmp_na) apr_pool_abort_get(cfg->pool)(ENOMEM);
1261 if (cfg->name_attributes) {
1262 size_t empty = (sizeof(struct mag_na_map) * 16);
1263 memset(tmp_na + size - empty, 0, empty);
1265 memset(tmp_na, 0, size);
1267 cfg->name_attributes = (struct mag_name_attributes *)tmp_na;
1268 apr_pool_userdata_setn(cfg, GSS_NAME_ATTR_USERDATA,
1269 mag_name_attrs_cleanup, cfg->pool);
1274 if (strcmp(w, "json") == 0) {
1275 cfg->name_attributes->output_json = true;
1277 ap_log_error(APLOG_MARK, APLOG_ERR, 0, parms->server,
1278 "Invalid Name Attributes value [%s].", w);
1283 c = cfg->name_attributes->map_count;
1284 cfg->name_attributes->map[c].env_name = apr_pstrndup(cfg->pool, w, p-w);
1286 cfg->name_attributes->map[c].attr_name = apr_pstrdup(cfg->pool, p);
1287 cfg->name_attributes->map_count += 1;
1292 #ifdef HAVE_GSS_ACQUIRE_CRED_WITH_PASSWORD
1293 static const char *mag_basic_auth_mechs(cmd_parms *parms, void *mconfig,
1296 struct mag_config *cfg = (struct mag_config *)mconfig;
1298 if (!mag_list_of_mechs(parms, &cfg->basic_mechs, false, w))
1299 return "Failed to apply GssapiBasicAuthMech directive";
1305 static void *mag_create_server_config(apr_pool_t *p, server_rec *s)
1307 struct mag_server_config *scfg;
1311 scfg = apr_pcalloc(p, sizeof(struct mag_server_config));
1313 maj = gss_indicate_mechs(&min, &scfg->default_mechs);
1314 if (maj != GSS_S_COMPLETE) {
1315 ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
1316 "gss_indicate_mechs() failed");
1318 /* Register the set in pool */
1319 apr_pool_cleanup_register(p, (void *)scfg->default_mechs,
1320 mag_oid_set_destroy, apr_pool_cleanup_null);
1323 rc = SEAL_KEY_CREATE(p, &scfg->mag_skey, NULL);
1325 ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
1326 "Failed to generate random sealing key!");
1332 static const command_rec mag_commands[] = {
1333 AP_INIT_FLAG("GssapiSSLonly", mag_ssl_only, NULL, OR_AUTHCFG,
1334 "Work only if connection is SSL Secured"),
1335 AP_INIT_FLAG("GssapiLocalName", mag_map_to_local, NULL, OR_AUTHCFG,
1336 "Translate principals to local names"),
1337 AP_INIT_FLAG("GssapiConnectionBound", mag_conn_ctx, NULL, OR_AUTHCFG,
1338 "Authentication is bound to the TCP connection"),
1339 AP_INIT_FLAG("GssapiSignalPersistentAuth", mag_send_persist, NULL, OR_AUTHCFG,
1340 "Send Persitent-Auth header according to connection bound"),
1341 AP_INIT_FLAG("GssapiUseSessions", mag_use_sess, NULL, OR_AUTHCFG,
1342 "Authentication uses mod_sessions to hold status"),
1343 AP_INIT_RAW_ARGS("GssapiSessionKey", mag_sess_key, NULL, OR_AUTHCFG,
1344 "Key Used to seal session data."),
1345 #ifdef HAVE_CRED_STORE
1346 AP_INIT_FLAG("GssapiUseS4U2Proxy", mag_use_s4u2p, NULL, OR_AUTHCFG,
1347 "Initializes credentials for s4u2proxy usage"),
1348 AP_INIT_ITERATE("GssapiCredStore", mag_cred_store, NULL, OR_AUTHCFG,
1349 "Credential Store"),
1350 AP_INIT_RAW_ARGS("GssapiDelegCcacheDir", mag_deleg_ccache_dir, NULL,
1351 OR_AUTHCFG, "Directory to store delegated credentials"),
1353 #ifdef HAVE_GSS_ACQUIRE_CRED_WITH_PASSWORD
1354 AP_INIT_FLAG("GssapiBasicAuth", mag_use_basic_auth, NULL, OR_AUTHCFG,
1355 "Allows use of Basic Auth for authentication"),
1356 AP_INIT_ITERATE("GssapiBasicAuthMech", mag_basic_auth_mechs, NULL,
1357 OR_AUTHCFG, "Mechanisms to use for basic auth"),
1359 AP_INIT_ITERATE("GssapiAllowedMech", mag_allow_mech, NULL, OR_AUTHCFG,
1360 "Allowed Mechanisms"),
1361 AP_INIT_RAW_ARGS("GssapiNameAttributes", mag_name_attrs, NULL, OR_AUTHCFG,
1362 "Name Attributes to be exported as environ variables"),
1367 mag_register_hooks(apr_pool_t *p)
1369 ap_hook_check_user_id(mag_auth, NULL, NULL, APR_HOOK_MIDDLE);
1370 ap_hook_post_config(mag_post_config, NULL, NULL, APR_HOOK_MIDDLE);
1371 ap_hook_pre_connection(mag_pre_connection, NULL, NULL, APR_HOOK_MIDDLE);
1374 module AP_MODULE_DECLARE_DATA auth_gssapi_module =
1376 STANDARD20_MODULE_STUFF,
1377 mag_create_dir_config,
1379 mag_create_server_config,