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_ntlmssp = {
28 GSS_NTLMSSP_OID_LENGTH, GSS_NTLMSSP_OID_STRING
31 const gss_OID_set_desc gss_mech_set_ntlmssp = {
32 1, discard_const(&gss_mech_ntlmssp)
35 #define MOD_AUTH_GSSAPI_VERSION PACKAGE_NAME "/" PACKAGE_VERSION
37 module AP_MODULE_DECLARE_DATA auth_gssapi_module;
39 APLOG_USE_MODULE(auth_gssapi);
41 static char *mag_status(request_rec *req, int type, uint32_t err)
43 uint32_t maj_ret, min_ret;
52 maj_ret = gss_display_status(&min_ret, err, type,
53 GSS_C_NO_OID, &msg_ctx, &text);
54 if (maj_ret != GSS_S_COMPLETE) {
60 msg_ret = apr_psprintf(req->pool, "%s, %*s",
61 msg_ret, len, (char *)text.value);
63 msg_ret = apr_psprintf(req->pool, "%*s", len, (char *)text.value);
65 gss_release_buffer(&min_ret, &text);
66 } while (msg_ctx != 0);
71 static char *mag_error(request_rec *req, const char *msg,
72 uint32_t maj, uint32_t min)
77 msg_maj = mag_status(req, GSS_C_GSS_CODE, maj);
78 msg_min = mag_status(req, GSS_C_MECH_CODE, min);
79 return apr_psprintf(req->pool, "%s: [%s (%s)]", msg, msg_maj, msg_min);
82 static APR_OPTIONAL_FN_TYPE(ssl_is_https) *mag_is_https = NULL;
84 static int mag_post_config(apr_pool_t *cfgpool, apr_pool_t *log,
85 apr_pool_t *temp, server_rec *s)
87 /* FIXME: create mutex to deal with connections and contexts ? */
88 mag_is_https = APR_RETRIEVE_OPTIONAL_FN(ssl_is_https);
89 mag_post_config_session();
90 ap_add_version_component(cfgpool, MOD_AUTH_GSSAPI_VERSION);
95 static int mag_pre_connection(conn_rec *c, void *csd)
99 mc = mag_new_conn_ctx(c->pool);
100 ap_set_module_config(c->conn_config, &auth_gssapi_module, (void*)mc);
104 static apr_status_t mag_conn_destroy(void *ptr)
106 struct mag_conn *mc = (struct mag_conn *)ptr;
110 (void)gss_delete_sec_context(&min, &mc->ctx, GSS_C_NO_BUFFER);
115 struct mag_conn *mag_new_conn_ctx(apr_pool_t *pool)
119 mc = apr_pcalloc(pool, sizeof(struct mag_conn));
120 apr_pool_create(&mc->pool, pool);
121 /* register the context in the memory pool, so it can be freed
122 * when the connection/request is terminated */
123 apr_pool_cleanup_register(mc->pool, (void *)mc,
124 mag_conn_destroy, apr_pool_cleanup_null);
129 static void mag_conn_clear(struct mag_conn *mc)
131 (void)mag_conn_destroy(mc);
134 apr_pool_clear(mc->pool);
136 memset(mc, 0, sizeof(struct mag_conn));
140 static bool mag_conn_is_https(conn_rec *c)
143 if (mag_is_https(c)) return true;
149 static bool mag_acquire_creds(request_rec *req,
150 struct mag_config *cfg,
151 gss_OID_set desired_mechs,
152 gss_cred_usage_t cred_usage,
153 gss_cred_id_t *creds,
154 gss_OID_set *actual_mechs)
157 #ifdef HAVE_CRED_STORE
158 gss_const_key_value_set_t store = cfg->cred_store;
160 maj = gss_acquire_cred_from(&min, GSS_C_NO_NAME, GSS_C_INDEFINITE,
161 desired_mechs, cred_usage, store, creds,
164 maj = gss_acquire_cred(&min, GSS_C_NO_NAME, GSS_C_INDEFINITE,
165 desired_mechs, cred_usage, creds,
169 if (GSS_ERROR(maj)) {
170 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req, "%s",
171 mag_error(req, "gss_acquire_cred[_from]() "
172 "failed to get server creds",
180 #ifdef HAVE_CRED_STORE
181 static char *escape(apr_pool_t *pool, const char *name,
182 char find, const char *replace)
184 char *escaped = NULL;
189 namecopy = apr_pstrdup(pool, name);
191 p = strchr(namecopy, find);
192 if (!p) return namecopy;
197 /* terminate previous segment */
200 escaped = apr_pstrcat(pool, escaped, n, replace, NULL);
202 escaped = apr_pstrcat(pool, n, replace, NULL);
204 /* move to next segment */
208 /* append last segment if any */
210 escaped = apr_pstrcat(pool, escaped, n, NULL);
216 static char *mag_gss_name_to_ccache_name(request_rec *req,
217 char *dir, const char *gss_name)
221 /* We need to escape away '/', we can't have path separators in
222 * a ccache file name */
223 /* first double escape the esacping char (~) if any */
224 escaped = escape(req->pool, gss_name, '~', "~~");
225 /* then escape away the separator (/) if any */
226 escaped = escape(req->pool, escaped, '/', "~");
228 return apr_psprintf(req->pool, "%s/%s", dir, escaped);
231 static void mag_set_KRB5CCANME(request_rec *req, char *ccname)
237 status = apr_stat(&finfo, ccname, APR_FINFO_MIN, req->pool);
238 if (status != APR_SUCCESS && status != APR_INCOMPLETE) {
239 /* set the file cache anyway, but warn */
240 ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req,
241 "KRB5CCNAME file (%s) lookup failed!", ccname);
244 value = apr_psprintf(req->pool, "FILE:%s", ccname);
245 apr_table_set(req->subprocess_env, "KRB5CCNAME", value);
248 static void mag_store_deleg_creds(request_rec *req,
249 char *dir, char *clientname,
250 gss_cred_id_t delegated_cred,
253 gss_key_value_element_desc element;
254 gss_key_value_set_desc store;
257 element.key = "ccache";
258 store.elements = &element;
261 ccname = mag_gss_name_to_ccache_name(req, dir, clientname);
262 element.value = apr_psprintf(req->pool, "FILE:%s", ccname);
264 maj = gss_store_cred_into(&min, delegated_cred, GSS_C_INITIATE,
265 GSS_C_NULL_OID, 1, 1, &store, NULL, NULL);
266 if (GSS_ERROR(maj)) {
267 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req, "%s",
268 mag_error(req, "failed to store delegated creds",
272 *ccachefile = ccname;
276 static bool parse_auth_header(apr_pool_t *pool, const char **auth_header,
279 char *auth_header_value;
281 auth_header_value = ap_getword_white(pool, auth_header);
282 if (!auth_header_value) return false;
283 value->length = apr_base64_decode_len(auth_header_value) + 1;
284 value->value = apr_pcalloc(pool, value->length);
285 if (!value->value) return false;
286 value->length = apr_base64_decode(value->value, auth_header_value);
291 static bool is_mech_allowed(struct mag_config *cfg, gss_const_OID mech)
293 if (cfg->allowed_mechs == GSS_C_NO_OID_SET) return true;
295 for (int i = 0; i < cfg->allowed_mechs->count; i++) {
296 if (gss_oid_equal(&cfg->allowed_mechs->elements[i], mech)) {
303 #define AUTH_TYPE_NEGOTIATE 0
304 #define AUTH_TYPE_BASIC 1
305 #define AUTH_TYPE_RAW_NTLM 2
306 const char *auth_types[] = {
313 static void mag_set_req_data(request_rec *req,
314 struct mag_config *cfg,
317 apr_table_set(req->subprocess_env, "GSS_NAME", mc->gss_name);
318 apr_table_set(req->subprocess_env, "GSS_SESSION_EXPIRATION",
319 apr_psprintf(req->pool,
320 "%ld", (long)mc->expiration));
321 req->ap_auth_type = apr_pstrdup(req->pool,
322 auth_types[mc->auth_type]);
323 req->user = apr_pstrdup(req->pool, mc->user_name);
324 if (cfg->deleg_ccache_dir && mc->delegated) {
326 ccname = mag_gss_name_to_ccache_name(req,
327 cfg->deleg_ccache_dir,
330 mag_set_KRB5CCANME(req, ccname);
335 static int mag_auth(request_rec *req)
339 struct mag_config *cfg;
340 const char *auth_header;
341 char *auth_header_type;
342 int ret = HTTP_UNAUTHORIZED;
343 gss_ctx_id_t ctx = GSS_C_NO_CONTEXT;
345 gss_buffer_desc input = GSS_C_EMPTY_BUFFER;
346 gss_buffer_desc output = GSS_C_EMPTY_BUFFER;
347 gss_buffer_desc name = GSS_C_EMPTY_BUFFER;
348 gss_buffer_desc ba_user;
349 gss_buffer_desc ba_pwd;
350 gss_name_t client = GSS_C_NO_NAME;
351 gss_cred_id_t user_cred = GSS_C_NO_CREDENTIAL;
352 gss_cred_id_t acquired_cred = GSS_C_NO_CREDENTIAL;
353 gss_cred_id_t server_cred = GSS_C_NO_CREDENTIAL;
354 gss_cred_id_t delegated_cred = GSS_C_NO_CREDENTIAL;
355 gss_cred_usage_t cred_usage = GSS_C_ACCEPT;
362 gss_OID mech_type = GSS_C_NO_OID;
363 gss_OID_set desired_mechs = GSS_C_NO_OID_SET;
364 gss_buffer_desc lname = GSS_C_EMPTY_BUFFER;
365 struct mag_conn *mc = NULL;
366 gss_ctx_id_t user_ctx = GSS_C_NO_CONTEXT;
367 gss_name_t server = GSS_C_NO_NAME;
368 #ifdef HAVE_GSS_KRB5_CCACHE_NAME
369 const char *user_ccache = NULL;
370 const char *orig_ccache = NULL;
372 uint32_t init_flags = 0;
376 type = ap_auth_type(req);
377 if ((type == NULL) || (strcasecmp(type, "GSSAPI") != 0)) {
381 cfg = ap_get_module_config(req->per_dir_config, &auth_gssapi_module);
383 if (!cfg->allowed_mechs) {
384 /* Try to fetch the default set if not explicitly configured */
385 (void)mag_acquire_creds(req, cfg, GSS_C_NO_OID_SET, GSS_C_ACCEPT,
386 &server_cred, &cfg->allowed_mechs);
387 (void)gss_release_cred(&min, &server_cred);
390 /* implicit auth for subrequests if main auth already happened */
391 if (!ap_is_initial_req(req) && req->main != NULL) {
392 type = ap_auth_type(req->main);
393 if ((type != NULL) && (strcasecmp(type, "GSSAPI") == 0)) {
394 /* warn if the subrequest location and the main request
395 * location have different configs */
396 if (cfg != ap_get_module_config(req->main->per_dir_config,
397 &auth_gssapi_module)) {
398 ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0,
399 req, "Subrequest authentication bypass on "
400 "location with different configuration!");
402 if (req->main->user) {
403 req->user = apr_pstrdup(req->pool, req->main->user);
406 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
407 "The main request is tasked to establish the "
408 "security context, can't proceed!");
409 return HTTP_UNAUTHORIZED;
412 ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, req,
413 "Subrequest GSSAPI auth with no auth on the main "
414 "request. This operation may fail if other "
415 "subrequests already established a context or the "
416 "mechanism requires multiple roundtrips.");
421 if (!mag_conn_is_https(req->connection)) {
422 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
423 "Not a TLS connection, refusing to authenticate!");
428 if (cfg->gss_conn_ctx) {
429 mc = (struct mag_conn *)ap_get_module_config(
430 req->connection->conn_config,
431 &auth_gssapi_module);
433 ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, req,
434 "Failed to retrieve connection context!");
439 /* if available, session always supersedes connection bound data */
440 if (cfg->use_sessions) {
441 mag_check_session(req, cfg, &mc);
444 auth_header = apr_table_get(req->headers_in, "Authorization");
447 if (mc->established && !auth_header) {
448 ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, req,
449 "Already established context found!");
450 mag_set_req_data(req, cfg, mc);
459 /* We can proceed only if we do have an auth header */
460 if (!auth_header) goto done;
462 auth_header_type = ap_getword_white(req->pool, &auth_header);
463 if (!auth_header_type) goto done;
465 for (i = 0; auth_types[i] != NULL; i++) {
466 if (strcasecmp(auth_header_type, auth_types[i]) == 0) {
473 case AUTH_TYPE_NEGOTIATE:
474 if (!parse_auth_header(req->pool, &auth_header, &input)) {
478 case AUTH_TYPE_BASIC:
479 if (!cfg->use_basic_auth) {
483 ba_pwd.value = ap_pbase64decode(req->pool, auth_header);
484 if (!ba_pwd.value) goto done;
485 ba_user.value = ap_getword_nulls_nc(req->pool,
486 (char **)&ba_pwd.value, ':');
487 if (!ba_user.value) goto done;
488 if (((char *)ba_user.value)[0] == '\0' ||
489 ((char *)ba_pwd.value)[0] == '\0') {
490 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
491 "Invalid empty user or password for Basic Auth");
494 ba_user.length = strlen(ba_user.value);
495 ba_pwd.length = strlen(ba_pwd.value);
497 if (mc && mc->established &&
498 mag_basic_check(cfg, mc, ba_user, ba_pwd)) {
499 ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, req,
500 "Already established BASIC AUTH context found!");
501 mag_set_req_data(req, cfg, mc);
508 case AUTH_TYPE_RAW_NTLM:
509 if (!is_mech_allowed(cfg, &gss_mech_ntlmssp)) {
510 ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, req,
511 "NTLM Authentication is not allowed!");
515 if (!parse_auth_header(req->pool, &auth_header, &input)) {
519 desired_mechs = discard_const(&gss_mech_set_ntlmssp);
526 if (mc && mc->established) {
527 /* if we are re-authenticating make sure the conn context
528 * is cleaned up so we do not accidentally reuse an existing
529 * established context */
533 req->ap_auth_type = apr_pstrdup(req->pool, auth_types[auth_type]);
535 #ifdef HAVE_CRED_STORE
536 if (cfg->use_s4u2proxy) {
537 cred_usage = GSS_C_BOTH;
540 if (!mag_acquire_creds(req, cfg, desired_mechs,
541 cred_usage, &acquired_cred, NULL)) {
545 if (auth_type == AUTH_TYPE_BASIC) {
546 maj = gss_import_name(&min, &ba_user, GSS_C_NT_USER_NAME, &client);
547 if (GSS_ERROR(maj)) {
548 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
550 mag_error(req, "gss_import_name() failed",
554 #ifdef HAVE_GSS_KRB5_CCACHE_NAME
555 /* Set a per-thread ccache in case we are using kerberos,
556 * it is not elegant but avoids interference between threads */
557 long long unsigned int rndname;
559 rs = apr_generate_random_bytes((unsigned char *)(&rndname),
560 sizeof(long long unsigned int));
561 if (rs != APR_SUCCESS) {
562 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
563 "Failed to generate random ccache name");
566 user_ccache = apr_psprintf(req->pool, "MEMORY:user_%qu", rndname);
567 maj = gss_krb5_ccache_name(&min, user_ccache, &orig_ccache);
568 if (GSS_ERROR(maj)) {
569 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
571 mag_error(req, "gss_krb5_ccache_name() "
572 "failed", maj, min));
576 maj = gss_acquire_cred_with_password(&min, client, &ba_pwd,
580 &user_cred, NULL, NULL);
581 if (GSS_ERROR(maj)) {
582 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
584 mag_error(req, "gss_acquire_cred_with_password() "
585 "failed", maj, min));
588 gss_release_name(&min, &client);
590 if (cred_usage == GSS_C_BOTH) {
591 /* If GSS_C_BOTH is used then inquire_cred will return the client
592 * name instead of the SPN of the server credentials. Therefore we
593 * need to acquire a different set of credential setting
594 * GSS_C_ACCEPT explicitly */
595 if (!mag_acquire_creds(req, cfg, cfg->allowed_mechs,
596 GSS_C_ACCEPT, &server_cred, NULL)) {
600 server_cred = acquired_cred;
602 maj = gss_inquire_cred(&min, server_cred, &server,
604 if (GSS_ERROR(maj)) {
605 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
606 "%s", mag_error(req, "gss_inquired_cred_() "
607 "failed", maj, min));
610 if (server_cred != acquired_cred) {
611 gss_release_cred(&min, &server_cred);
614 #ifdef HAVE_CRED_STORE
615 if (cfg->deleg_ccache_dir) {
616 /* delegate ourselves credentials so we store them as requested */
617 init_flags |= GSS_C_DELEG_FLAG;
621 /* output and input are inverted here, this is intentional */
622 maj = gss_init_sec_context(&min, user_cred, &user_ctx, server,
623 GSS_C_NO_OID, init_flags, 300,
624 GSS_C_NO_CHANNEL_BINDINGS, &output,
625 NULL, &input, NULL, NULL);
626 if (GSS_ERROR(maj)) {
627 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
628 "%s", mag_error(req, "gss_init_sec_context() "
629 "failed", maj, min));
634 if (auth_type == AUTH_TYPE_NEGOTIATE &&
635 cfg->allowed_mechs != GSS_C_NO_OID_SET) {
636 maj = gss_set_neg_mechs(&min, acquired_cred, cfg->allowed_mechs);
637 if (GSS_ERROR(maj)) {
638 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req, "%s",
639 mag_error(req, "gss_set_neg_mechs() failed",
645 maj = gss_accept_sec_context(&min, pctx, acquired_cred,
646 &input, GSS_C_NO_CHANNEL_BINDINGS,
647 &client, &mech_type, &output, &flags, &vtime,
649 if (GSS_ERROR(maj)) {
650 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req, "%s",
651 mag_error(req, "gss_accept_sec_context() failed",
655 if (auth_type == AUTH_TYPE_BASIC) {
656 while (maj == GSS_S_CONTINUE_NEEDED) {
657 gss_release_buffer(&min, &input);
658 /* output and input are inverted here, this is intentional */
659 maj = gss_init_sec_context(&min, user_cred, &user_ctx, server,
660 GSS_C_NO_OID, init_flags, 300,
661 GSS_C_NO_CHANNEL_BINDINGS, &output,
662 NULL, &input, NULL, NULL);
663 if (GSS_ERROR(maj)) {
664 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
665 "%s", mag_error(req, "gss_init_sec_context() "
666 "failed", maj, min));
669 gss_release_buffer(&min, &output);
670 maj = gss_accept_sec_context(&min, pctx, acquired_cred,
671 &input, GSS_C_NO_CHANNEL_BINDINGS,
672 &client, &mech_type, &output, &flags,
673 &vtime, &delegated_cred);
674 if (GSS_ERROR(maj)) {
675 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
676 "%s", mag_error(req, "gss_accept_sec_context()"
677 " failed", maj, min));
681 } else if (maj == GSS_S_CONTINUE_NEEDED) {
683 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
684 "Mechanism needs continuation but neither "
685 "GssapiConnectionBound nor "
686 "GssapiUseSessions are available");
687 gss_release_buffer(&min, &output);
690 /* auth not complete send token and wait next packet */
694 /* Always set the GSS name in an env var */
695 maj = gss_display_name(&min, client, &name, NULL);
696 if (GSS_ERROR(maj)) {
697 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req, "%s",
698 mag_error(req, "gss_display_name() failed",
702 clientname = apr_pstrndup(req->pool, name.value, name.length);
703 apr_table_set(req->subprocess_env, "GSS_NAME", clientname);
704 expiration = time(NULL) + vtime;
705 apr_table_set(req->subprocess_env, "GSS_SESSION_EXPIRATION",
706 apr_psprintf(req->pool, "%ld", (long)expiration));
708 #ifdef HAVE_CRED_STORE
709 if (cfg->deleg_ccache_dir && delegated_cred != GSS_C_NO_CREDENTIAL) {
710 char *ccachefile = NULL;
712 mag_store_deleg_creds(req, cfg->deleg_ccache_dir, clientname,
713 delegated_cred, &ccachefile);
716 mag_set_KRB5CCANME(req, ccachefile);
720 mc->delegated = true;
725 if (cfg->map_to_local) {
726 maj = gss_localname(&min, client, mech_type, &lname);
727 if (maj != GSS_S_COMPLETE) {
728 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req, "%s",
729 mag_error(req, "gss_localname() failed", maj, min));
732 req->user = apr_pstrndup(req->pool, lname.value, lname.length);
734 req->user = clientname;
738 mc->user_name = apr_pstrdup(mc->pool, req->user);
739 mc->gss_name = apr_pstrdup(mc->pool, clientname);
740 mc->established = true;
741 if (vtime == GSS_C_INDEFINITE || vtime < MIN_SESS_EXP_TIME) {
742 vtime = MIN_SESS_EXP_TIME;
744 mc->expiration = expiration;
745 mc->auth_type = auth_type;
746 if (auth_type == AUTH_TYPE_BASIC) {
747 mag_basic_cache(cfg, mc, ba_user, ba_pwd);
749 if (cfg->use_sessions) {
750 mag_attempt_session(req, cfg, mc);
754 if (cfg->send_persist)
755 apr_table_set(req->headers_out, "Persistent-Auth",
756 cfg->gss_conn_ctx ? "true" : "false");
761 if ((auth_type != AUTH_TYPE_BASIC) && (output.length != 0)) {
762 int prefixlen = strlen(auth_types[auth_type]) + 1;
763 replen = apr_base64_encode_len(output.length) + 1;
764 reply = apr_pcalloc(req->pool, prefixlen + replen);
766 memcpy(reply, auth_types[auth_type], prefixlen - 1);
767 reply[prefixlen - 1] = ' ';
768 apr_base64_encode(&reply[prefixlen], output.value, output.length);
769 apr_table_add(req->err_headers_out,
770 "WWW-Authenticate", reply);
772 } else if (ret == HTTP_UNAUTHORIZED) {
773 apr_table_add(req->err_headers_out, "WWW-Authenticate", "Negotiate");
774 if (is_mech_allowed(cfg, &gss_mech_ntlmssp)) {
775 apr_table_add(req->err_headers_out, "WWW-Authenticate", "NTLM");
777 if (cfg->use_basic_auth) {
778 apr_table_add(req->err_headers_out,
780 apr_psprintf(req->pool, "Basic realm=\"%s\"",
784 #ifdef HAVE_GSS_KRB5_CCACHE_NAME
785 if (user_ccache != NULL) {
786 maj = gss_krb5_ccache_name(&min, orig_ccache, NULL);
787 if (maj != GSS_S_COMPLETE) {
788 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, req,
789 "Failed to restore per-thread ccache, %s",
790 mag_error(req, "gss_krb5_ccache_name() "
791 "failed", maj, min));
795 if (ctx != GSS_C_NO_CONTEXT)
796 gss_delete_sec_context(&min, &ctx, GSS_C_NO_BUFFER);
797 gss_delete_sec_context(&min, &user_ctx, GSS_C_NO_BUFFER);
798 gss_release_cred(&min, &user_cred);
799 gss_release_cred(&min, &acquired_cred);
800 gss_release_cred(&min, &delegated_cred);
801 gss_release_buffer(&min, &output);
802 gss_release_name(&min, &client);
803 gss_release_name(&min, &server);
804 gss_release_buffer(&min, &name);
805 gss_release_buffer(&min, &lname);
810 static void *mag_create_dir_config(apr_pool_t *p, char *dir)
812 struct mag_config *cfg;
814 cfg = (struct mag_config *)apr_pcalloc(p, sizeof(struct mag_config));
820 static const char *mag_ssl_only(cmd_parms *parms, void *mconfig, int on)
822 struct mag_config *cfg = (struct mag_config *)mconfig;
823 cfg->ssl_only = on ? true : false;
827 static const char *mag_map_to_local(cmd_parms *parms, void *mconfig, int on)
829 struct mag_config *cfg = (struct mag_config *)mconfig;
830 cfg->map_to_local = on ? true : false;
834 static const char *mag_conn_ctx(cmd_parms *parms, void *mconfig, int on)
836 struct mag_config *cfg = (struct mag_config *)mconfig;
837 cfg->gss_conn_ctx = on ? true : false;
841 static const char *mag_send_persist(cmd_parms *parms, void *mconfig, int on)
843 struct mag_config *cfg = (struct mag_config *)mconfig;
844 cfg->send_persist = on ? true : false;
848 static const char *mag_use_sess(cmd_parms *parms, void *mconfig, int on)
850 struct mag_config *cfg = (struct mag_config *)mconfig;
851 cfg->use_sessions = on ? true : false;
855 #ifdef HAVE_CRED_STORE
856 static const char *mag_use_s4u2p(cmd_parms *parms, void *mconfig, int on)
858 struct mag_config *cfg = (struct mag_config *)mconfig;
859 cfg->use_s4u2proxy = on ? true : false;
861 if (cfg->deleg_ccache_dir == NULL) {
862 cfg->deleg_ccache_dir = apr_pstrdup(parms->pool, "/tmp");
868 static const char *mag_sess_key(cmd_parms *parms, void *mconfig, const char *w)
870 struct mag_config *cfg = (struct mag_config *)mconfig;
877 if (strncmp(w, "key:", 4) != 0) {
878 ap_log_error(APLOG_MARK, APLOG_ERR, 0, parms->server,
879 "Invalid key format, expected prefix 'key:'");
884 l = apr_base64_decode_len(k);
885 val = apr_palloc(parms->temp_pool, l);
887 keys.length = (int)apr_base64_decode_binary(val, k);
888 keys.value = (unsigned char *)val;
890 if (keys.length != 32) {
891 ap_log_error(APLOG_MARK, APLOG_ERR, 0, parms->server,
892 "Invalid key length, expected 32 got %d", keys.length);
896 rc = SEAL_KEY_CREATE(cfg->pool, &cfg->mag_skey, &keys);
898 ap_log_error(APLOG_MARK, APLOG_ERR, 0, parms->server,
899 "Failed to import sealing key!");
904 #ifdef HAVE_CRED_STORE
906 #define MAX_CRED_OPTIONS 10
908 static const char *mag_cred_store(cmd_parms *parms, void *mconfig,
911 struct mag_config *cfg = (struct mag_config *)mconfig;
912 gss_key_value_element_desc *elements;
921 ap_log_error(APLOG_MARK, APLOG_ERR, 0, parms->server,
922 "%s [%s]", "Invalid syntax for GssapiCredStore option", w);
926 key = apr_pstrndup(parms->pool, w, (p-w));
927 value = apr_pstrdup(parms->pool, p + 1);
929 if (!cfg->cred_store) {
930 cfg->cred_store = apr_pcalloc(parms->pool,
931 sizeof(gss_key_value_set_desc));
932 size = sizeof(gss_key_value_element_desc) * MAX_CRED_OPTIONS;
933 cfg->cred_store->elements = apr_palloc(parms->pool, size);
936 elements = cfg->cred_store->elements;
937 count = cfg->cred_store->count;
939 if (count >= MAX_CRED_OPTIONS) {
940 ap_log_error(APLOG_MARK, APLOG_ERR, 0, parms->server,
941 "Too many GssapiCredStore options (MAX: %d)",
945 cfg->cred_store->count++;
947 elements[count].key = key;
948 elements[count].value = value;
953 static const char *mag_deleg_ccache_dir(cmd_parms *parms, void *mconfig,
956 struct mag_config *cfg = (struct mag_config *)mconfig;
958 cfg->deleg_ccache_dir = apr_pstrdup(parms->pool, value);
964 static const char *mag_use_basic_auth(cmd_parms *parms, void *mconfig, int on)
966 struct mag_config *cfg = (struct mag_config *)mconfig;
968 cfg->use_basic_auth = on ? true : false;
972 #define MAX_ALLOWED_MECHS 10
974 static const char *mag_allow_mech(cmd_parms *parms, void *mconfig,
977 struct mag_config *cfg = (struct mag_config *)mconfig;
981 if (!cfg->allowed_mechs) {
982 cfg->allowed_mechs = apr_pcalloc(parms->pool,
983 sizeof(gss_OID_set_desc));
984 size = sizeof(gss_OID) * MAX_ALLOWED_MECHS;
985 cfg->allowed_mechs->elements = apr_palloc(parms->pool, size);
988 if (strcmp(w, "krb5") == 0) {
990 } else if (strcmp(w, "iakerb") == 0) {
991 oid = gss_mech_iakerb;
992 } else if (strcmp(w, "ntlmssp") == 0) {
993 oid = &gss_mech_ntlmssp;
995 ap_log_error(APLOG_MARK, APLOG_ERR, 0, parms->server,
996 "Unrecognized GSSAPI Mechanism: %s", w);
1000 if (cfg->allowed_mechs->count >= MAX_ALLOWED_MECHS) {
1001 ap_log_error(APLOG_MARK, APLOG_ERR, 0, parms->server,
1002 "Too many GssapiAllowedMech options (MAX: %d)",
1006 cfg->allowed_mechs->elements[cfg->allowed_mechs->count] = *oid;
1007 cfg->allowed_mechs->count++;
1012 static const command_rec mag_commands[] = {
1013 AP_INIT_FLAG("GssapiSSLonly", mag_ssl_only, NULL, OR_AUTHCFG,
1014 "Work only if connection is SSL Secured"),
1015 AP_INIT_FLAG("GssapiLocalName", mag_map_to_local, NULL, OR_AUTHCFG,
1016 "Translate principals to local names"),
1017 AP_INIT_FLAG("GssapiConnectionBound", mag_conn_ctx, NULL, OR_AUTHCFG,
1018 "Authentication is bound to the TCP connection"),
1019 AP_INIT_FLAG("GssapiSignalPersistentAuth", mag_send_persist, NULL, OR_AUTHCFG,
1020 "Send Persitent-Auth header according to connection bound"),
1021 AP_INIT_FLAG("GssapiUseSessions", mag_use_sess, NULL, OR_AUTHCFG,
1022 "Authentication uses mod_sessions to hold status"),
1023 AP_INIT_RAW_ARGS("GssapiSessionKey", mag_sess_key, NULL, OR_AUTHCFG,
1024 "Key Used to seal session data."),
1025 #ifdef HAVE_CRED_STORE
1026 AP_INIT_FLAG("GssapiUseS4U2Proxy", mag_use_s4u2p, NULL, OR_AUTHCFG,
1027 "Initializes credentials for s4u2proxy usage"),
1028 AP_INIT_ITERATE("GssapiCredStore", mag_cred_store, NULL, OR_AUTHCFG,
1029 "Credential Store"),
1030 AP_INIT_RAW_ARGS("GssapiDelegCcacheDir", mag_deleg_ccache_dir, NULL,
1031 OR_AUTHCFG, "Directory to store delegated credentials"),
1033 #ifdef HAVE_GSS_ACQUIRE_CRED_WITH_PASSWORD
1034 AP_INIT_FLAG("GssapiBasicAuth", mag_use_basic_auth, NULL, OR_AUTHCFG,
1035 "Allows use of Basic Auth for authentication"),
1037 AP_INIT_ITERATE("GssapiAllowedMech", mag_allow_mech, NULL, OR_AUTHCFG,
1038 "Allowed Mechanisms"),
1043 mag_register_hooks(apr_pool_t *p)
1045 ap_hook_check_user_id(mag_auth, NULL, NULL, APR_HOOK_MIDDLE);
1046 ap_hook_post_config(mag_post_config, NULL, NULL, APR_HOOK_MIDDLE);
1047 ap_hook_pre_connection(mag_pre_connection, NULL, NULL, APR_HOOK_MIDDLE);
1050 module AP_MODULE_DECLARE_DATA auth_gssapi_module =
1052 STANDARD20_MODULE_STUFF,
1053 mag_create_dir_config,