2 * Daniel Kouril <kouril@users.sourceforge.net>
4 * Source and Documentation can be found at:
5 * http://modauthkerb.sourceforge.net/
8 * James E. Robinson, III <james@ncstate.net>
9 * Daniel Henninger <daniel@ncsu.edu>
10 * Ludek Sulak <xsulak@fi.muni.cz>
14 * Copyright (c) 2004-2006 Masarykova universita
15 * (Masaryk University, Brno, Czech Republic)
16 * All rights reserved.
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions are met:
21 * 1. Redistributions of source code must retain the above copyright notice,
22 * this list of conditions and the following disclaimer.
24 * 2. Redistributions in binary form must reproduce the above copyright
25 * notice, this list of conditions and the following disclaimer in the
26 * documentation and/or other materials provided with the distribution.
28 * 3. Neither the name of the University nor the names of its contributors may
29 * be used to endorse or promote products derived from this software
30 * without specific prior written permission.
32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
33 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
34 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
35 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
36 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
37 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
38 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
39 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
40 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
41 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42 * POSSIBILITY OF SUCH DAMAGE.
53 #define MODAUTHKERB_VERSION "5.3"
55 #define MECH_NEGOTIATE "Negotiate"
56 #define SERVICE_NAME "HTTP"
59 #include <http_config.h>
60 #include <http_core.h>
62 #include <http_protocol.h>
63 #include <http_request.h>
65 #ifdef STANDARD20_MODULE_STUFF
66 #include <apr_strings.h>
67 #include <apr_base64.h>
69 #define apr_pstrdup ap_pstrdup
70 #define apr_psprintf ap_psprintf
71 #define apr_pstrcat ap_pstrcat
72 #define apr_pcalloc ap_pcalloc
73 #define apr_table_setn ap_table_setn
74 #define apr_table_add ap_table_add
75 #define apr_base64_decode_len ap_base64decode_len
76 #define apr_base64_decode ap_base64decode
77 #define apr_base64_encode_len ap_base64encode_len
78 #define apr_base64_encode ap_base64encode
79 #define apr_pool_cleanup_null ap_null_cleanup
80 #define apr_pool_cleanup_register ap_register_cleanup
81 #endif /* STANDARD20_MODULE_STUFF */
84 #define vsnprintf _vsnprintf
85 #define snprintf _snprintf
93 # include <gssapi/gssapi.h>
94 # include <gssapi/gssapi_generic.h>
95 # include <gssapi/gssapi_krb5.h>
96 # define GSS_C_NT_USER_NAME gss_nt_user_name
97 # define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name
98 # define GSS_KRB5_NT_PRINCIPAL_NAME gss_nt_krb5_name
99 # define krb5_get_err_text(context,code) error_message(code)
101 #ifndef GSSAPI_SUPPORTS_SPNEGO
102 # include "spnegokrb5.h"
107 /* Prevent warning about closesocket redefinition (Apache's ap_config.h and
108 * MIT Kerberos' port-sockets.h both define it as close) */
113 #include <netdb.h> /* gethostbyname() */
120 #ifndef KRB5_LIB_FUNCTION
122 # define KRB5_LIB_FUNCTION _stdcall
124 # define KRB5_LIB_FUNCTION
128 #ifdef STANDARD20_MODULE_STUFF
129 module AP_MODULE_DECLARE_DATA auth_kerb_module;
131 module auth_kerb_module;
134 /***************************************************************************
135 Macros To Ease Compatibility
136 ***************************************************************************/
137 #ifdef STANDARD20_MODULE_STUFF
138 #define MK_POOL apr_pool_t
139 #define MK_TABLE_GET apr_table_get
140 #define MK_USER r->user
141 #define MK_AUTH_TYPE r->ap_auth_type
144 #define MK_TABLE_GET ap_table_get
145 #define MK_USER r->connection->user
146 #define MK_AUTH_TYPE r->connection->ap_auth_type
147 #define PROXYREQ_PROXY STD_PROXY
150 /***************************************************************************
151 Auth Configuration Structure
152 ***************************************************************************/
154 char *krb_auth_realms;
155 int krb_save_credentials;
157 char *krb_service_name;
158 int krb_authoritative;
159 int krb_delegate_basic;
161 int krb_ssl_preauthentication;
165 int krb_method_gssapi;
166 int krb_method_k5pass;
167 int krb5_do_auth_to_local;
171 int krb_method_k4pass;
175 typedef struct krb5_conn_data {
183 set_kerb_auth_headers(request_rec *r, const kerb_auth_config *conf,
184 int use_krb4, int use_krb5pwd, char *negotiate_ret_value);
187 krb5_save_realms(cmd_parms *cmd, void *sec, const char *arg);
189 #ifdef STANDARD20_MODULE_STUFF
190 #define command(name, func, var, type, usage) \
191 AP_INIT_ ## type (name, (void*) func, \
192 (void*)APR_OFFSETOF(kerb_auth_config, var), \
193 OR_AUTHCFG | RSRC_CONF, usage)
195 #define command(name, func, var, type, usage) \
197 (void*)XtOffsetOf(kerb_auth_config, var), \
198 OR_AUTHCFG | RSRC_CONF, type, usage }
201 static const command_rec kerb_auth_cmds[] = {
202 command("KrbAuthRealms", krb5_save_realms, krb_auth_realms,
203 RAW_ARGS, "Realms to attempt authentication against (can be multiple)."),
205 command("KrbAuthRealm", krb5_save_realms, krb_auth_realms,
206 RAW_ARGS, "Alias for KrbAuthRealms."),
208 command("KrbSaveCredentials", ap_set_flag_slot, krb_save_credentials,
209 FLAG, "Save and store credentials/tickets retrieved during auth."),
211 command("KrbVerifyKDC", ap_set_flag_slot, krb_verify_kdc,
212 FLAG, "Verify tickets against keytab to prevent KDC spoofing attacks."),
214 command("KrbServiceName", ap_set_string_slot, krb_service_name,
215 TAKE1, "Full or partial service name to be used by Apache for authentication."),
217 command("KrbAuthoritative", ap_set_flag_slot, krb_authoritative,
218 FLAG, "Set to 'off' to allow access control to be passed along to lower modules iff the UserID is not known to this module."),
220 command("KrbDelegateBasic", ap_set_flag_slot, krb_delegate_basic,
221 FLAG, "Always offer Basic authentication regardless of KrbMethodK5Pass and pass on authentication to lower modules if Basic headers arrive."),
224 command("KrbEnableSSLPreauthentication", ap_set_flag_slot, krb_ssl_preauthentication,
225 FLAG, "Don't do Kerberos authentication if the user is already authenticated using SSL and her client certificate."),
229 command("Krb5Keytab", ap_set_file_slot, krb_5_keytab,
230 TAKE1, "Location of Kerberos V5 keytab file."),
232 command("KrbMethodNegotiate", ap_set_flag_slot, krb_method_gssapi,
233 FLAG, "Enable Negotiate authentication method."),
235 command("KrbMethodK5Passwd", ap_set_flag_slot, krb_method_k5pass,
236 FLAG, "Enable Kerberos V5 password authentication."),
238 command("KrbLocalUserMapping", ap_set_flag_slot, krb5_do_auth_to_local,
239 FLAG, "Set to 'on' to have Kerberos do auth_to_local mapping of principal names to system user names."),
243 command("Krb4Srvtab", ap_set_file_slot, krb_4_srvtab,
244 TAKE1, "Location of Kerberos V4 srvtab file."),
246 command("KrbMethodK4Passwd", ap_set_flag_slot, krb_method_k4pass,
247 FLAG, "Enable Kerberos V4 password authentication."),
255 mkstemp(char *template)
260 start = strlen(template) - 1;
261 while(template[start] == 'X') {
262 template[start] = '0' + val % 10;
269 fd = open(template, O_RDWR | O_CREAT | O_EXCL, 0600);
270 if(fd >= 0 || errno != EEXIST)
277 if(template[i] == '9' + 1)
279 if(template[i] <= 'z')
288 #if defined(KRB5) && !defined(HEIMDAL)
289 /* Needed to work around problems with replay caches */
290 #include "mit-internals.h"
292 /* This is our replacement krb5_rc_store function */
293 static krb5_error_code KRB5_LIB_FUNCTION
294 mod_auth_kerb_rc_store(krb5_context context, krb5_rcache rcache,
295 krb5_donot_replay_internal *donot_replay)
300 /* And this is the operations vector for our replay cache */
301 const krb5_rc_ops_internal mod_auth_kerb_rc_ops = {
308 mod_auth_kerb_rc_store,
310 krb5_rc_dfl_get_span,
311 krb5_rc_dfl_get_name,
316 /***************************************************************************
317 Auth Configuration Initialization
318 ***************************************************************************/
319 static void *kerb_dir_create_config(MK_POOL *p, char *d)
321 kerb_auth_config *rec;
323 rec = (kerb_auth_config *) apr_pcalloc(p, sizeof(kerb_auth_config));
324 ((kerb_auth_config *)rec)->krb_verify_kdc = 1;
325 ((kerb_auth_config *)rec)->krb_service_name = NULL;
326 ((kerb_auth_config *)rec)->krb_authoritative = 1;
327 ((kerb_auth_config *)rec)->krb_delegate_basic = 0;
329 ((kerb_auth_config *)rec)->krb_ssl_preauthentication = 0;
332 ((kerb_auth_config *)rec)->krb5_do_auth_to_local = 0;
333 ((kerb_auth_config *)rec)->krb_method_k5pass = 1;
334 ((kerb_auth_config *)rec)->krb_method_gssapi = 1;
337 ((kerb_auth_config *)rec)->krb_method_k4pass = 1;
343 krb5_save_realms(cmd_parms *cmd, void *vsec, const char *arg)
345 kerb_auth_config *sec = (kerb_auth_config *) vsec;
346 sec->krb_auth_realms= apr_pstrdup(cmd->pool, arg);
351 log_rerror(const char *file, int line, int level, int status,
352 const request_rec *r, const char *fmt, ...)
358 vsnprintf(errstr, sizeof(errstr), fmt, ap);
362 #ifdef STANDARD20_MODULE_STUFF
363 ap_log_rerror(file, line, level | APLOG_NOERRNO, status, r, "%s", errstr);
365 ap_log_rerror(file, line, level | APLOG_NOERRNO, r, "%s", errstr);
370 /***************************************************************************
371 Username/Password Validation for Krb4
372 ***************************************************************************/
374 verify_krb4_user(request_rec *r, const char *name, const char *instance,
375 const char *realm, const char *password, const char *linstance, const char *srvtab, int krb_verify_kdc)
381 const char *hostname;
384 char lrealm[REALM_SZ];
386 ret = krb_get_pw_in_tkt(name, instance, realm, "krbtgt", realm,
387 DEFAULT_TKT_LIFE, password);
389 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
390 "Cannot get krb4 ticket: krb_get_pw_in_tkt() failed: %s",
391 krb_get_err_text(ret));
398 hostname = ap_get_server_name(r);
400 hp = gethostbyname(hostname);
403 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
404 "Cannot verify krb4 ticket: gethostbyname() failed: %s",
408 memcpy(&addr, hp->h_addr, sizeof(addr));
410 phost = krb_get_phost((char *)hostname);
412 krb_get_lrealm(lrealm, 1);
414 ret = krb_mk_req(&ticket, linstance, phost, lrealm, 0);
416 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
417 "Cannot verify krb4 ticket: krb_mk_req() failed: %s",
418 krb_get_err_text(ret));
423 ret = krb_rd_req(&ticket, (char *)linstance, phost, addr, &authdata, (char *)srvtab);
425 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
426 "Cannot verify krb4 ticket: krb_rd_req() failed: %s",
427 krb_get_err_text(ret));
435 krb4_cache_cleanup(void *data)
437 char *tkt_file = (char *) data;
439 krb_set_tkt_string(tkt_file);
445 authenticate_user_krb4pwd(request_rec *r,
446 kerb_auth_config *conf,
447 const char *auth_line)
451 const char *sent_name;
454 char *tkt_file_p = NULL;
459 char lrealm[REALM_SZ];
460 int all_principals_unkown;
462 sent_pw = ap_pbase64decode(r->pool, auth_line);
463 sent_name = ap_getword_nulls_nc (r->pool, (char **) &sent_pw, ':');
465 sent_instance = strchr(sent_name, '.');
467 *sent_instance++ = '\0';
469 snprintf(tkt_file, sizeof(tkt_file), "/tmp/apache_tkt_XXXXXX");
470 fd = mkstemp(tkt_file);
472 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
473 "Cannot create krb4 ccache: mkstemp() failed: %s",
475 return HTTP_INTERNAL_SERVER_ERROR;
478 tkt_file_p = apr_pstrdup(r->pool, tkt_file);
479 apr_pool_cleanup_register(r->pool, tkt_file_p, krb4_cache_cleanup,
480 apr_pool_cleanup_null);
482 krb_set_tkt_string(tkt_file);
484 all_principals_unkown = 1;
485 realms = conf->krb_auth_realms;
487 memset(lrealm, 0, sizeof(lrealm));
490 realm = ap_getword_white(r->pool, &realms);
493 ret = krb_get_lrealm(lrealm, 1);
499 /* XXX conf->krb_service_name */
500 ret = verify_krb4_user(r, (char *)sent_name,
501 (sent_instance) ? sent_instance : "",
502 (char *)realm, (char *)sent_pw,
503 conf->krb_service_name,
504 conf->krb_4_srvtab, conf->krb_verify_kdc);
505 if (!conf->krb_authoritative && ret) {
506 /* if we're not authoritative, we allow authentication to pass on
507 * to another modules if (and only if) the user is not known to us */
508 if (all_principals_unkown && ret != KDC_PR_UNKNOWN)
509 all_principals_unkown = 0;
514 } while (realms && *realms);
517 /* XXX log only in the verify_krb4_user() call */
518 log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "Verifying krb4 password failed");
519 ret = (!conf->krb_authoritative && all_principals_unkown == 1 && ret == KDC_PR_UNKNOWN) ?
520 DECLINED : HTTP_UNAUTHORIZED;
524 user = apr_pstrdup(r->pool, sent_name);
526 user = apr_pstrcat(r->pool, user, ".", sent_instance, NULL);
527 user = apr_pstrcat(r->pool, user, "@", realm, NULL);
530 MK_AUTH_TYPE = "Basic";
531 apr_table_setn(r->subprocess_env, "KRBTKFILE", tkt_file_p);
533 if (!conf->krb_save_credentials)
534 krb4_cache_cleanup(tkt_file);
538 krb4_cache_cleanup(tkt_file);
547 /***************************************************************************
548 Username/Password Validation for Krb5
549 ***************************************************************************/
551 /* MIT kerberos uses replay cache checks even during credential verification
552 * (i.e. in krb5_verify_init_creds()), which is obviosuly useless. In order to
553 * avoid problems with multiple apache processes accessing the same rcache file
554 * we had to use this call instead, which is only a bit modified version of
555 * krb5_verify_init_creds() */
556 static krb5_error_code
557 verify_krb5_init_creds(request_rec *r, krb5_context context, krb5_creds *creds,
558 krb5_principal ap_req_server, krb5_keytab ap_req_keytab)
562 krb5_ccache local_ccache = NULL;
563 krb5_creds *new_creds = NULL;
564 krb5_auth_context auth_context = NULL;
565 krb5_keytab keytab = NULL;
568 memset(&req, 0, sizeof(req));
570 if (ap_req_keytab == NULL) {
571 ret = krb5_kt_default (context, &keytab);
575 keytab = ap_req_keytab;
577 #ifdef HAVE_KRB5_CC_NEW_UNIQUE
578 ret = krb5_cc_new_unique(context, "MEMORY", NULL, &local_ccache);
580 ret = krb5_cc_resolve(context, "MEMORY:", &local_ccache);
584 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
585 "krb5_cc_resolve() failed when verifying KDC");
589 ret = krb5_cc_initialize(context, local_ccache, creds->client);
591 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
592 "krb5_cc_initialize() failed when verifying KDC");
596 ret = krb5_cc_store_cred (context, local_ccache, creds);
598 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
599 "krb5_cc_initialize() failed when verifying KDC");
603 ret = krb5_unparse_name(context, ap_req_server, &server_name);
605 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
606 "krb5_unparse_name() failed when verifying KDC");
609 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
610 "Trying to verify authenticity of KDC using principal %s", server_name);
613 if (!krb5_principal_compare (context, ap_req_server, creds->server)) {
614 krb5_creds match_cred;
616 memset (&match_cred, 0, sizeof(match_cred));
618 match_cred.client = creds->client;
619 match_cred.server = ap_req_server;
621 ret = krb5_get_credentials (context, 0, local_ccache,
622 &match_cred, &new_creds);
624 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
625 "krb5_get_credentials() failed when verifying KDC");
631 ret = krb5_mk_req_extended (context, &auth_context, 0, NULL, creds, &req);
633 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
634 "krb5_mk_req_extended() failed when verifying KDC");
638 krb5_auth_con_free (context, auth_context);
640 ret = krb5_auth_con_init(context, &auth_context);
642 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
643 "krb5_auth_con_init() failed when verifying KDC");
646 /* use KRB5_AUTH_CONTEXT_DO_SEQUENCE to skip replay cache checks */
647 krb5_auth_con_setflags(context, auth_context, KRB5_AUTH_CONTEXT_DO_SEQUENCE);
649 ret = krb5_rd_req (context, &auth_context, &req, ap_req_server,
652 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
653 "krb5_rd_req() failed when verifying KDC");
659 /* XXX Do I ever want to support Heimdal 0.4 ??? */
660 krb5_data_free(&req);
662 krb5_free_data_contents(context, &req);
665 krb5_auth_con_free (context, auth_context);
667 krb5_free_creds (context, new_creds);
668 if (ap_req_keytab == NULL && keytab)
669 krb5_kt_close (context, keytab);
671 krb5_cc_destroy (context, local_ccache);
676 /* Inspired by krb5_verify_user from Heimdal */
677 static krb5_error_code
678 verify_krb5_user(request_rec *r, krb5_context context, krb5_principal principal,
679 const char *password, krb5_principal server,
680 krb5_keytab keytab, int krb_verify_kdc, char *krb_service_name, krb5_ccache *ccache)
683 krb5_get_init_creds_opt options;
685 krb5_ccache ret_ccache = NULL;
687 krb5_keytab_entry entry;
688 krb5_kt_cursor cursor;
690 /* XXX error messages shouldn't be logged here (and in the while() loop in
691 * authenticate_user_krb5pwd() as weell), in order to avoid confusing log
692 * entries when using multiple realms */
694 memset(&creds, 0, sizeof(creds));
696 ret = krb5_unparse_name(context, principal, &name);
698 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
699 "Trying to get TGT for user %s", name);
703 krb5_get_init_creds_opt_init(&options);
704 ret = krb5_get_init_creds_password(context, &creds, principal,
705 (char *)password, NULL,
706 NULL, 0, NULL, &options);
708 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
709 "krb5_get_init_creds_password() failed: %s",
710 krb5_get_err_text(context, ret));
718 krb5_get_default_realm(context, &realm);
719 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
720 "trying to verify password using key for %s/%s@%s",
721 service, ap_get_server_name(r), realm);
725 /*if (krb_verify_kdc &&
726 (ret = verify_krb5_init_creds(r, context, &creds, server, keytab))) {
727 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
728 "failed to verify krb5 credentials: %s",
729 krb5_get_err_text(context, ret));
733 if (krb_verify_kdc) {
734 if (krb_service_name && strcmp(krb_service_name,"Any") == 0) {
735 ret = krb5_kt_start_seq_get(context, keytab, &cursor);
737 while((krb5_kt_next_entry(context, keytab, &entry, &cursor)) == 0){
738 if ((ret = verify_krb5_init_creds(r, context, &creds, entry.principal, keytab)) == 0)
743 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
744 "failed to verify krb5 credentials: %s",
745 krb5_get_err_text(context, ret));
746 krb5_kt_end_seq_get(context, keytab, &cursor);
747 krb5_kt_close(context, keytab);
750 krb5_kt_end_seq_get(context, keytab, &cursor);
751 krb5_kt_close(context, keytab);
754 if ((ret = verify_krb5_init_creds(r, context, &creds, server, keytab))) {
755 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
756 "failed to verify krb5 credentials: %s",
757 krb5_get_err_text(context, ret));
763 #ifdef HAVE_KRB5_CC_NEW_UNIQUE
764 ret = krb5_cc_new_unique(context, "MEMORY", NULL, &ret_ccache);
766 ret = krb5_cc_resolve(context, "MEMORY:", &ret_ccache);
770 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
771 "generating new memory ccache failed: %s",
772 krb5_get_err_text(context, ret));
776 ret = krb5_cc_initialize(context, ret_ccache, principal);
778 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
779 "krb5_cc_initialize() failed: %s",
780 krb5_get_err_text(context, ret));
784 ret = krb5_cc_store_cred(context, ret_ccache, &creds);
786 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
787 "krb5_cc_store_cred() failed: %s",
788 krb5_get_err_text(context, ret));
791 *ccache = ret_ccache;
795 krb5_free_cred_contents(context, &creds);
797 krb5_cc_destroy(context, ret_ccache);
803 krb5_cache_cleanup(void *data)
805 krb5_context context;
807 krb5_error_code problem;
808 char *cache_name = (char *) data;
810 problem = krb5_init_context(&context);
812 /* ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL, "krb5_init_context() failed"); */
813 return HTTP_INTERNAL_SERVER_ERROR;
816 problem = krb5_cc_resolve(context, cache_name, &cache);
818 /* log_error(APLOG_MARK, APLOG_ERR, 0, NULL,
819 "krb5_cc_resolve() failed (%s: %s)",
820 cache_name, krb5_get_err_text(context, problem)); */
821 return HTTP_INTERNAL_SERVER_ERROR;
824 krb5_cc_destroy(context, cache);
825 krb5_free_context(context);
830 create_krb5_ccache(krb5_context kcontext,
832 kerb_auth_config *conf,
833 krb5_principal princ,
838 krb5_error_code problem;
840 krb5_ccache tmp_ccache = NULL;
842 ccname = apr_psprintf(r->pool, "FILE:%s/krb5cc_apache_XXXXXX", P_tmpdir);
843 fd = mkstemp(ccname + strlen("FILE:"));
845 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
846 "mkstemp() failed: %s", strerror(errno));
847 ret = HTTP_INTERNAL_SERVER_ERROR;
852 problem = krb5_cc_resolve(kcontext, ccname, &tmp_ccache);
854 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
855 "krb5_cc_resolve() failed: %s",
856 krb5_get_err_text(kcontext, problem));
857 ret = HTTP_INTERNAL_SERVER_ERROR;
862 problem = krb5_cc_initialize(kcontext, tmp_ccache, princ);
864 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
865 "Cannot initialize krb5 ccache %s: krb5_cc_initialize() failed: %s",
866 ccname, krb5_get_err_text(kcontext, problem));
867 ret = HTTP_INTERNAL_SERVER_ERROR;
871 apr_table_setn(r->subprocess_env, "KRB5CCNAME", ccname);
872 apr_pool_cleanup_register(r->pool, ccname, krb5_cache_cleanup,
873 apr_pool_cleanup_null);
875 *ccache = tmp_ccache;
882 krb5_cc_destroy(kcontext, tmp_ccache);
888 store_krb5_creds(krb5_context kcontext,
890 kerb_auth_config *conf,
891 krb5_ccache delegated_cred)
894 krb5_error_code problem;
895 krb5_principal princ;
899 problem = krb5_cc_get_principal(kcontext, delegated_cred, &princ);
901 snprintf(errstr, sizeof(errstr), "krb5_cc_get_principal() failed: %s",
902 krb5_get_err_text(kcontext, problem));
903 return HTTP_INTERNAL_SERVER_ERROR;
906 ret = create_krb5_ccache(kcontext, r, conf, princ, &ccache);
908 krb5_free_principal(kcontext, princ);
913 problem = krb5_cc_copy_cache(kcontext, delegated_cred, ccache);
915 problem = krb5_cc_copy_creds(kcontext, delegated_cred, ccache);
917 krb5_free_principal(kcontext, princ);
919 snprintf(errstr, sizeof(errstr), "Failed to store credentials: %s",
920 krb5_get_err_text(kcontext, problem));
921 krb5_cc_destroy(kcontext, ccache);
922 return HTTP_INTERNAL_SERVER_ERROR;
925 krb5_cc_close(kcontext, ccache);
931 authenticate_user_krb5pwd(request_rec *r,
932 kerb_auth_config *conf,
933 const char *auth_line)
935 const char *sent_pw = NULL;
936 char *sent_name = NULL;
937 const char *realms = NULL;
938 const char *realm = NULL;
939 krb5_context kcontext = NULL;
940 krb5_error_code code;
941 krb5_principal client = NULL;
942 krb5_principal server = NULL;
943 krb5_ccache ccache = NULL;
944 krb5_keytab keytab = NULL;
947 int all_principals_unkown;
950 code = krb5_init_context(&kcontext);
952 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
953 "Cannot initialize Kerberos5 context (%d)", code);
954 return HTTP_INTERNAL_SERVER_ERROR;
957 sent_pw = ap_pbase64decode(r->pool, auth_line);
958 sent_name = ap_getword_nulls_nc (r->pool, (char **) &sent_pw, ':');
960 if (sent_pw == NULL || *sent_pw == '\0') {
961 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
962 "empty passwords are not accepted");
963 ret = HTTP_UNAUTHORIZED;
967 if (conf->krb_5_keytab)
968 krb5_kt_resolve(kcontext, conf->krb_5_keytab, &keytab);
970 if (conf->krb_service_name && strchr(conf->krb_service_name, '/') != NULL)
971 ret = krb5_parse_name (kcontext, conf->krb_service_name, &server);
973 ret = krb5_sname_to_principal(kcontext, ap_get_server_name(r),
974 (conf->krb_service_name) ? conf->krb_service_name : SERVICE_NAME,
975 KRB5_NT_SRV_HST, &server);
978 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
979 "Error parsing server name (%s): %s",
980 (conf->krb_service_name) ? conf->krb_service_name : SERVICE_NAME,
981 krb5_get_err_text(kcontext, ret));
982 ret = HTTP_UNAUTHORIZED;
986 code = krb5_unparse_name(kcontext, server, &name);
988 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
989 "krb5_unparse_name() failed: %s",
990 krb5_get_err_text(kcontext, code));
991 ret = HTTP_UNAUTHORIZED;
994 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "Using %s as server principal for password verification", name);
998 p = strchr(sent_name, '@');
1001 if (conf->krb_auth_realms && !ap_find_token(r->pool, conf->krb_auth_realms, p)) {
1002 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1003 "Specified realm `%s' not allowed by configuration", p);
1004 ret = HTTP_UNAUTHORIZED;
1009 realms = (p) ? p : conf->krb_auth_realms;
1010 all_principals_unkown = 1;
1012 name = (char *) sent_name;
1013 if (realms && (realm = ap_getword_white(r->pool, &realms)))
1014 name = apr_psprintf(r->pool, "%s@%s", sent_name, realm);
1017 krb5_free_principal(kcontext, client);
1021 code = krb5_parse_name(kcontext, name, &client);
1023 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1024 "krb5_parse_name() failed: %s",
1025 krb5_get_err_text(kcontext, code));
1029 code = verify_krb5_user(r, kcontext, client, sent_pw,
1030 server, keytab, conf->krb_verify_kdc, conf->krb_service_name, &ccache);
1031 if (!conf->krb_authoritative && code) {
1032 /* if we're not authoritative, we allow authentication to pass on
1033 * to another modules if (and only if) the user is not known to us */
1034 if (all_principals_unkown && code != KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN)
1035 all_principals_unkown = 0;
1041 /* ap_getword_white() used above shifts the parameter, so it's not
1042 needed to touch the realms variable */
1043 } while (realms && *realms);
1045 memset((char *)sent_pw, 0, strlen(sent_pw));
1048 if (!conf->krb_authoritative && all_principals_unkown == 1 && code == KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN)
1051 ret = HTTP_UNAUTHORIZED;
1056 code = krb5_unparse_name(kcontext, client, &name);
1058 log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "krb5_unparse_name() failed: %s",
1059 krb5_get_err_text(kcontext, code));
1060 ret = HTTP_UNAUTHORIZED;
1063 MK_USER = apr_pstrdup (r->pool, name);
1064 MK_AUTH_TYPE = "Basic";
1067 if (conf->krb_save_credentials)
1068 store_krb5_creds(kcontext, r, conf, ccache);
1073 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1074 "kerb_authenticate_user_krb5pwd ret=%d user=%s authtype=%s",
1075 ret, (MK_USER)?MK_USER:"(NULL)", (MK_AUTH_TYPE)?MK_AUTH_TYPE:"(NULL)");
1077 krb5_free_principal(kcontext, client);
1079 krb5_free_principal(kcontext, server);
1081 krb5_cc_destroy(kcontext, ccache);
1083 krb5_kt_close(kcontext, keytab);
1084 krb5_free_context(kcontext);
1089 /*********************************************************************
1090 * GSSAPI Authentication
1091 ********************************************************************/
1094 get_gss_error(request_rec *r, OM_uint32 err_maj, OM_uint32 err_min, char *prefix)
1096 OM_uint32 maj_stat, min_stat;
1097 OM_uint32 msg_ctx = 0;
1098 gss_buffer_desc status_string;
1101 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1102 "GSS-API major_status:%8.8x, minor_status:%8.8x",
1105 err_msg = apr_pstrdup(r->pool, prefix);
1107 maj_stat = gss_display_status (&min_stat,
1113 if (!GSS_ERROR(maj_stat)) {
1114 err_msg = apr_pstrcat(r->pool, err_msg, ": ",
1115 (char*) status_string.value, NULL);
1116 gss_release_buffer(&min_stat, &status_string);
1118 } while (!GSS_ERROR(maj_stat) && msg_ctx != 0);
1121 err_msg = apr_pstrcat(r->pool, err_msg, " (", NULL);
1123 maj_stat = gss_display_status (&min_stat,
1129 if (!GSS_ERROR(maj_stat)) {
1130 err_msg = apr_pstrcat(r->pool, err_msg, ", ",
1131 (char *) status_string.value, NULL);
1132 gss_release_buffer(&min_stat, &status_string);
1134 } while (!GSS_ERROR(maj_stat) && msg_ctx != 0);
1135 err_msg = apr_pstrcat(r->pool, err_msg, ")", NULL);
1141 store_gss_creds(request_rec *r, kerb_auth_config *conf, char *princ_name,
1142 gss_cred_id_t delegated_cred)
1144 OM_uint32 maj_stat, min_stat;
1145 krb5_principal princ = NULL;
1146 krb5_ccache ccache = NULL;
1147 krb5_error_code problem;
1148 krb5_context context;
1149 int ret = HTTP_INTERNAL_SERVER_ERROR;
1151 problem = krb5_init_context(&context);
1153 log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "Cannot initialize krb5 context");
1154 return HTTP_INTERNAL_SERVER_ERROR;
1157 problem = krb5_parse_name(context, princ_name, &princ);
1159 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1160 "Cannot parse delegated username (%s)", krb5_get_err_text(context, problem));
1164 problem = create_krb5_ccache(context, r, conf, princ, &ccache);
1166 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1167 "Cannot create krb5 ccache (%s)", krb5_get_err_text(context, problem));
1171 maj_stat = gss_krb5_copy_ccache(&min_stat, delegated_cred, ccache);
1172 if (GSS_ERROR(maj_stat)) {
1173 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1174 "Cannot store delegated credential (%s)",
1175 get_gss_error(r, maj_stat, min_stat, "gss_krb5_copy_ccache"));
1179 krb5_cc_close(context, ccache);
1185 krb5_free_principal(context, princ);
1187 krb5_cc_destroy(context, ccache);
1188 krb5_free_context(context);
1193 get_gss_creds(request_rec *r,
1194 kerb_auth_config *conf,
1195 gss_cred_id_t *server_creds)
1197 gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
1198 OM_uint32 major_status, minor_status, minor_status2;
1199 gss_name_t server_name = GSS_C_NO_NAME;
1201 int have_server_princ;
1204 have_server_princ = conf->krb_service_name && strchr(conf->krb_service_name, '/') != NULL;
1205 if (have_server_princ)
1206 strncpy(buf, conf->krb_service_name, sizeof(buf));
1207 else if (conf->krb_service_name && strcmp(conf->krb_service_name,"Any") == 0) {
1208 *server_creds = GSS_C_NO_CREDENTIAL;
1212 snprintf(buf, sizeof(buf), "%s@%s",
1213 (conf->krb_service_name) ? conf->krb_service_name : SERVICE_NAME,
1214 ap_get_server_name(r));
1217 token.length = strlen(buf) + 1;
1219 major_status = gss_import_name(&minor_status, &token,
1220 (have_server_princ) ? GSS_KRB5_NT_PRINCIPAL_NAME : GSS_C_NT_HOSTBASED_SERVICE,
1222 memset(&token, 0, sizeof(token));
1223 if (GSS_ERROR(major_status)) {
1224 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1225 "%s", get_gss_error(r, major_status, minor_status,
1226 "gss_import_name() failed"));
1227 return HTTP_INTERNAL_SERVER_ERROR;
1230 major_status = gss_display_name(&minor_status, server_name, &token, NULL);
1231 if (GSS_ERROR(major_status)) {
1232 /* Perhaps we could just ignore this error but it's safer to give up now,
1234 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1235 "%s", get_gss_error(r, major_status, minor_status,
1236 "gss_display_name() failed"));
1237 return HTTP_INTERNAL_SERVER_ERROR;
1240 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "Acquiring creds for %s",
1242 gss_release_buffer(&minor_status, &token);
1244 major_status = gss_acquire_cred(&minor_status, server_name, GSS_C_INDEFINITE,
1245 GSS_C_NO_OID_SET, GSS_C_ACCEPT,
1246 server_creds, NULL, NULL);
1247 gss_release_name(&minor_status2, &server_name);
1248 if (GSS_ERROR(major_status)) {
1249 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1250 "%s", get_gss_error(r, major_status, minor_status,
1251 "gss_acquire_cred() failed"));
1252 return HTTP_INTERNAL_SERVER_ERROR;
1257 * With MIT Kerberos 5 1.3.x the gss_cred_id_t is the same as
1258 * krb5_gss_cred_id_t and krb5_gss_cred_id_rec contains a pointer to
1260 * This allows us to override the replay cache function vector with
1262 * Note that this is a dirty hack to get things working and there may
1263 * well be unknown side-effects.
1266 krb5_gss_cred_id_t gss_creds = (krb5_gss_cred_id_t) *server_creds;
1268 /* First we try to verify we are linked with 1.3.x to prevent from
1269 crashing when linked with 1.4.x */
1270 if (gss_creds && (gss_creds->usage == GSS_C_ACCEPT)) {
1271 if (gss_creds->rcache && gss_creds->rcache->ops &&
1272 gss_creds->rcache->ops->type &&
1273 memcmp(gss_creds->rcache->ops->type, "dfl", 3) == 0)
1274 /* Override the rcache operations */
1275 gss_creds->rcache->ops = &mod_auth_kerb_rc_ops;
1284 cmp_gss_type(gss_buffer_t token, gss_OID oid)
1289 if (token->length == 0)
1290 return GSS_S_DEFECTIVE_TOKEN;
1294 return GSS_S_DEFECTIVE_TOKEN;
1297 if ((len & 0x7f) > 4)
1298 return GSS_S_DEFECTIVE_TOKEN;
1302 return GSS_S_DEFECTIVE_TOKEN;
1304 if (((OM_uint32) *p++) != oid->length)
1305 return GSS_S_DEFECTIVE_TOKEN;
1307 return memcmp(p, oid->elements, oid->length);
1311 authenticate_user_gss(request_rec *r, kerb_auth_config *conf,
1312 const char *auth_line, char **negotiate_ret_value)
1314 OM_uint32 major_status, minor_status, minor_status2;
1315 gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
1316 gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
1317 const char *auth_param = NULL;
1319 gss_name_t client_name = GSS_C_NO_NAME;
1320 gss_cred_id_t delegated_cred = GSS_C_NO_CREDENTIAL;
1321 OM_uint32 (KRB5_LIB_FUNCTION *accept_sec_token)
1322 (OM_uint32 *, gss_ctx_id_t *, const gss_cred_id_t,
1323 const gss_buffer_t, const gss_channel_bindings_t,
1324 gss_name_t *, gss_OID *, gss_buffer_t, OM_uint32 *,
1325 OM_uint32 *, gss_cred_id_t *);
1326 gss_OID_desc spnego_oid;
1327 gss_ctx_id_t context = GSS_C_NO_CONTEXT;
1328 gss_cred_id_t server_creds = GSS_C_NO_CREDENTIAL;
1329 OM_uint32 ret_flags = 0;
1331 *negotiate_ret_value = "\0";
1333 spnego_oid.length = 6;
1334 spnego_oid.elements = (void *)"\x2b\x06\x01\x05\x05\x02";
1336 if (conf->krb_5_keytab) {
1338 /* we don't use the ap_* calls here, since the string passed to putenv()
1339 * will become part of the enviroment and shouldn't be free()ed by apache
1341 ktname = malloc(strlen("KRB5_KTNAME=") + strlen(conf->krb_5_keytab) + 1);
1342 if (ktname == NULL) {
1343 log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "malloc() failed: not enough memory");
1344 ret = HTTP_INTERNAL_SERVER_ERROR;
1347 sprintf(ktname, "KRB5_KTNAME=%s", conf->krb_5_keytab);
1350 /* Seems to be also supported by latest MIT */
1351 gsskrb5_register_acceptor_identity(conf->krb_5_keytab);
1355 ret = get_gss_creds(r, conf, &server_creds);
1359 /* ap_getword() shifts parameter */
1360 auth_param = ap_getword_white(r->pool, &auth_line);
1361 if (auth_param == NULL) {
1362 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1363 "No Authorization parameter in request from client");
1364 ret = HTTP_UNAUTHORIZED;
1368 input_token.length = apr_base64_decode_len(auth_param) + 1;
1369 input_token.value = apr_pcalloc(r->connection->pool, input_token.length);
1370 if (input_token.value == NULL) {
1371 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1372 "ap_pcalloc() failed (not enough memory)");
1373 ret = HTTP_INTERNAL_SERVER_ERROR;
1376 input_token.length = apr_base64_decode(input_token.value, auth_param);
1378 #ifdef GSSAPI_SUPPORTS_SPNEGO
1379 accept_sec_token = gss_accept_sec_context;
1381 accept_sec_token = (cmp_gss_type(&input_token, &spnego_oid) == 0) ?
1382 gss_accept_sec_context_spnego : gss_accept_sec_context;
1385 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "Verifying client data using %s",
1386 (accept_sec_token == gss_accept_sec_context)
1388 : "SPNEGO GSS-API");
1390 major_status = accept_sec_token(&minor_status,
1394 GSS_C_NO_CHANNEL_BINDINGS,
1401 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1402 "Client %s us their credential",
1403 (ret_flags & GSS_C_DELEG_FLAG) ? "sent" : "didn't send");
1404 if (output_token.length) {
1408 len = apr_base64_encode_len(output_token.length) + 1;
1409 token = apr_pcalloc(r->connection->pool, len + 1);
1410 if (token == NULL) {
1411 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1412 "ap_pcalloc() failed (not enough memory)");
1413 ret = HTTP_INTERNAL_SERVER_ERROR;
1414 gss_release_buffer(&minor_status2, &output_token);
1417 apr_base64_encode(token, output_token.value, output_token.length);
1419 *negotiate_ret_value = token;
1420 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1421 "GSS-API token of length %d bytes will be sent back",
1422 output_token.length);
1423 gss_release_buffer(&minor_status2, &output_token);
1424 set_kerb_auth_headers(r, conf, 0, 0, *negotiate_ret_value);
1427 if (GSS_ERROR(major_status)) {
1428 if (input_token.length > 7 && memcmp(input_token.value, "NTLMSSP", 7) == 0)
1429 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1430 "Warning: received token seems to be NTLM, which isn't supported by the Kerberos module. Check your IE configuration.");
1432 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1433 "%s", get_gss_error(r, major_status, minor_status,
1434 "gss_accept_sec_context() failed"));
1435 /* Don't offer the Negotiate method again if call to GSS layer failed */
1436 *negotiate_ret_value = NULL;
1437 ret = HTTP_UNAUTHORIZED;
1442 /* This is a _Kerberos_ module so multiple authentication rounds aren't
1443 * supported. If we wanted a generic GSS authentication we would have to do
1444 * some magic with exporting context etc. */
1445 if (major_status & GSS_S_CONTINUE_NEEDED) {
1446 ret = HTTP_UNAUTHORIZED;
1451 major_status = gss_display_name(&minor_status, client_name, &output_token, NULL);
1452 gss_release_name(&minor_status, &client_name);
1453 if (GSS_ERROR(major_status)) {
1454 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1455 "%s", get_gss_error(r, major_status, minor_status,
1456 "gss_display_name() failed"));
1457 ret = HTTP_INTERNAL_SERVER_ERROR;
1461 MK_AUTH_TYPE = MECH_NEGOTIATE;
1462 MK_USER = apr_pstrdup(r->pool, output_token.value);
1464 if (conf->krb_save_credentials && delegated_cred != GSS_C_NO_CREDENTIAL)
1465 store_gss_creds(r, conf, (char *)output_token.value, delegated_cred);
1467 gss_release_buffer(&minor_status, &output_token);
1473 gss_release_cred(&minor_status, &delegated_cred);
1475 if (output_token.length)
1476 gss_release_buffer(&minor_status, &output_token);
1478 if (client_name != GSS_C_NO_NAME)
1479 gss_release_name(&minor_status, &client_name);
1481 if (server_creds != GSS_C_NO_CREDENTIAL)
1482 gss_release_cred(&minor_status, &server_creds);
1484 if (context != GSS_C_NO_CONTEXT)
1485 gss_delete_sec_context(&minor_status, &context, GSS_C_NO_BUFFER);
1491 do_krb5_an_to_ln(request_rec *r) {
1492 krb5_error_code code;
1493 int ret = HTTP_INTERNAL_SERVER_ERROR;
1494 char *MK_USER_LNAME = NULL;
1495 krb5_context kcontext = NULL;
1496 krb5_principal client = NULL;
1498 code = krb5_init_context(&kcontext);
1500 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1501 "Cannot initialize Kerberos5 context (%d)", code);
1505 code = krb5_parse_name(kcontext, MK_USER, &client);
1507 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1508 "krb5_parse_name() failed: %s",
1509 krb5_get_err_text(kcontext, code));
1512 MK_USER_LNAME = apr_pcalloc(r->pool, strlen(MK_USER)+1);
1513 if (MK_USER_LNAME == NULL) {
1514 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1515 "ap_pcalloc() failed (not enough memory)");
1518 code = krb5_aname_to_localname(kcontext, client, strlen(MK_USER), MK_USER_LNAME);
1520 if (code != KRB5_LNAME_NOTRANS) {
1521 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1522 "krb5_aname_to_localname() failed: %s",
1523 krb5_get_err_text(kcontext, code));
1527 log_rerror(APLOG_MARK, APLOG_NOTICE, 0, r,
1528 "krb5_aname_to_localname() found no "
1529 "mapping for principal %s",
1534 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1535 "kerb_authenticate_a_name_to_local_name %s -> %s",
1536 (MK_USER)?MK_USER:"(NULL)", (MK_USER_LNAME)?MK_USER_LNAME:"(NULL)");
1537 MK_USER = apr_pstrdup(r->pool, MK_USER_LNAME);
1542 krb5_free_principal(kcontext, client);
1544 krb5_free_context(kcontext);
1551 static krb5_conn_data *
1552 already_succeeded(request_rec *r, char *auth_line)
1554 krb5_conn_data *conn_data;
1555 const char keyname[1024];
1557 snprintf(keyname, sizeof(keyname) - 1,
1558 "mod_auth_kerb::connection::%s::%ld", r->connection->remote_ip,
1561 if (apr_pool_userdata_get(&conn_data, keyname, r->connection->pool) != 0)
1565 if(strcmp(conn_data->authline, auth_line) == 0) {
1566 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "matched previous auth request");
1574 set_kerb_auth_headers(request_rec *r, const kerb_auth_config *conf,
1575 int use_krb4, int use_krb5pwd, char *negotiate_ret_value)
1577 const char *auth_name = NULL;
1579 char *negoauth_param;
1580 const char *header_name =
1581 (r->proxyreq == PROXYREQ_PROXY) ? "Proxy-Authenticate" : "WWW-Authenticate";
1583 /* get the user realm specified in .htaccess */
1584 auth_name = ap_auth_name(r);
1586 /* XXX should the WWW-Authenticate header be cleared first?
1587 * apache in the proxy mode should retain client's authN headers? */
1589 if (negotiate_ret_value != NULL && conf->krb_method_gssapi) {
1590 negoauth_param = (*negotiate_ret_value == '\0') ? MECH_NEGOTIATE :
1591 apr_pstrcat(r->pool, MECH_NEGOTIATE " ", negotiate_ret_value, NULL);
1592 apr_table_add(r->err_headers_out, header_name, negoauth_param);
1594 if ((use_krb5pwd && conf->krb_method_k5pass) || conf->krb_delegate_basic) {
1595 apr_table_add(r->err_headers_out, header_name,
1596 apr_pstrcat(r->pool, "Basic realm=\"", auth_name, "\"", NULL));
1603 ((use_krb4 && conf->krb_method_k4pass) || conf->krb_delegate_basic))
1604 apr_table_add(r->err_headers_out, header_name,
1605 apr_pstrcat(r->pool, "Basic realm=\"", auth_name, "\"", NULL));
1610 kerb_authenticate_user(request_rec *r)
1612 kerb_auth_config *conf =
1613 (kerb_auth_config *) ap_get_module_config(r->per_dir_config,
1615 krb5_conn_data *prevauth = NULL;
1616 const char *auth_type = NULL;
1617 const char *auth_line = NULL;
1618 const char *type = NULL;
1619 int use_krb5 = 0, use_krb4 = 0;
1621 static int last_return = HTTP_UNAUTHORIZED;
1622 char *negotiate_ret_value = NULL;
1625 /* get the type specified in .htaccess */
1626 type = ap_auth_type(r);
1628 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1629 "kerb_authenticate_user entered with user %s and auth_type %s",
1630 (MK_USER)?MK_USER:"(NULL)",type?type:"(NULL)");
1632 if (type && strcasecmp(type, "Kerberos") == 0)
1633 use_krb5 = use_krb4 = 1;
1634 else if(type && strcasecmp(type, "KerberosV5") == 0)
1636 else if(type && strcasecmp(type, "KerberosV4") == 0)
1642 if (conf->krb_ssl_preauthentication) {
1643 const char *ssl_client_verify = ssl_var_lookup(r->pool, r->server,
1644 r->connection, r, "SSL_CLIENT_VERIFY");
1646 if (ssl_client_verify && strcmp(ssl_client_verify, "SUCCESS") == 0)
1651 /* get what the user sent us in the HTTP header */
1652 auth_line = MK_TABLE_GET(r->headers_in, (r->proxyreq == PROXYREQ_PROXY)
1653 ? "Proxy-Authorization"
1656 set_kerb_auth_headers(r, conf, use_krb4, use_krb5,
1657 (use_krb5) ? "\0" : NULL);
1658 return HTTP_UNAUTHORIZED;
1660 auth_type = ap_getword_white(r->pool, &auth_line);
1662 /* If we are delegating Basic to other modules, DECLINE the request */
1663 if (conf->krb_delegate_basic &&
1665 !conf->krb_method_k5pass &&
1668 !conf->krb_method_k4pass &&
1670 (strcasecmp(auth_type, "Basic") == 0))
1673 if ( (prevauth = already_succeeded(r, auth_line)) == NULL) {
1674 ret = HTTP_UNAUTHORIZED;
1677 if (use_krb5 && conf->krb_method_gssapi &&
1678 strcasecmp(auth_type, MECH_NEGOTIATE) == 0) {
1679 ret = authenticate_user_gss(r, conf, auth_line, &negotiate_ret_value);
1680 } else if (use_krb5 && conf->krb_method_k5pass &&
1681 strcasecmp(auth_type, "Basic") == 0) {
1682 ret = authenticate_user_krb5pwd(r, conf, auth_line);
1687 if (ret == HTTP_UNAUTHORIZED && use_krb4 && conf->krb_method_k4pass &&
1688 strcasecmp(auth_type, "Basic") == 0)
1689 ret = authenticate_user_krb4pwd(r, conf, auth_line);
1692 if (ret == HTTP_UNAUTHORIZED)
1693 set_kerb_auth_headers(r, conf, use_krb4, use_krb5, negotiate_ret_value);
1696 ret = prevauth->last_return;
1697 MK_USER = prevauth->user;
1698 MK_AUTH_TYPE = prevauth->mech;
1702 * save who was auth'd, if it's not already stashed.
1705 prevauth = (krb5_conn_data *) apr_pcalloc(r->connection->pool, sizeof(krb5_conn_data));
1706 prevauth->user = apr_pstrdup(r->connection->pool, MK_USER);
1707 prevauth->authline = apr_pstrdup(r->connection->pool, auth_line);
1708 prevauth->mech = apr_pstrdup(r->connection->pool, auth_type);
1709 prevauth->last_return = ret;
1710 snprintf(keyname, sizeof(keyname) - 1,
1711 "mod_auth_kerb::connection::%s::%ld",
1712 r->connection->remote_ip, r->connection->id);
1713 apr_pool_userdata_set(prevauth, keyname, NULL, r->connection->pool);
1716 if (ret == OK && conf->krb5_do_auth_to_local)
1717 ret = do_krb5_an_to_ln(r);
1719 /* XXX log_debug: if ret==OK, log(user XY authenticated) */
1726 have_rcache_type(const char *type)
1728 krb5_error_code ret;
1729 krb5_context context;
1730 krb5_rcache id = NULL;
1733 ret = krb5_init_context(&context);
1737 ret = krb5_rc_resolve_full(context, &id, "none:");
1741 krb5_rc_destroy(context, id);
1742 krb5_free_context(context);
1747 /***************************************************************************
1748 Module Setup/Configuration
1749 ***************************************************************************/
1750 #ifndef STANDARD20_MODULE_STUFF
1752 kerb_module_init(server_rec *dummy, pool *p)
1755 /* Suppress the MIT replay cache. Requires MIT Kerberos 1.4.0 or later.
1756 1.3.x are covered by the hack overiding the replay calls */
1757 if (getenv("KRB5RCACHETYPE") == NULL && have_rcache_type("none"))
1758 putenv(strdup("KRB5RCACHETYPE=none"));
1762 module MODULE_VAR_EXPORT auth_kerb_module = {
1763 STANDARD_MODULE_STUFF,
1764 kerb_module_init, /* module initializer */
1765 kerb_dir_create_config, /* per-directory config creator */
1766 NULL, /* per-directory config merger */
1767 NULL, /* per-server config creator */
1768 NULL, /* per-server config merger */
1769 kerb_auth_cmds, /* command table */
1770 NULL, /* [ 9] content handlers */
1771 NULL, /* [ 2] URI-to-filename translation */
1772 kerb_authenticate_user, /* [ 5] check/validate user_id */
1773 NULL, /* [ 6] check user_id is valid *here* */
1774 NULL, /* [ 4] check access by host address */
1775 NULL, /* [ 7] MIME type checker/setter */
1776 NULL, /* [ 8] fixups */
1777 NULL, /* [10] logger */
1778 NULL, /* [ 3] header parser */
1779 NULL, /* process initialization */
1780 NULL, /* process exit/cleanup */
1781 NULL /* [ 1] post read_request handling */
1783 ,NULL, /* EAPI: add_module */
1784 NULL, /* EAPI: remove_module */
1785 NULL, /* EAPI: rewrite_command */
1786 NULL /* EAPI: new_connection */
1791 kerb_init_handler(apr_pool_t *p, apr_pool_t *plog,
1792 apr_pool_t *ptemp, server_rec *s)
1794 ap_add_version_component(p, "mod_auth_kerb/" MODAUTHKERB_VERSION);
1796 /* Suppress the MIT replay cache. Requires MIT Kerberos 1.4.0 or later.
1797 1.3.x are covered by the hack overiding the replay calls */
1798 if (getenv("KRB5RCACHETYPE") == NULL && have_rcache_type("none"))
1799 putenv(strdup("KRB5RCACHETYPE=none"));
1806 kerb_register_hooks(apr_pool_t *p)
1808 ap_hook_post_config(kerb_init_handler, NULL, NULL, APR_HOOK_MIDDLE);
1809 ap_hook_check_user_id(kerb_authenticate_user, NULL, NULL, APR_HOOK_MIDDLE);
1812 module AP_MODULE_DECLARE_DATA auth_kerb_module =
1814 STANDARD20_MODULE_STUFF,
1815 kerb_dir_create_config, /* create per-dir conf structures */
1816 NULL, /* merge per-dir conf structures */
1817 NULL, /* create per-server conf structures */
1818 NULL, /* merge per-server conf structures */
1819 kerb_auth_cmds, /* table of configuration directives */
1820 kerb_register_hooks /* register hooks */