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) 2004-2005 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 "5.0-rc6"
54 #define MECH_NEGOTIATE "Negotiate"
57 #include <http_config.h>
58 #include <http_core.h>
60 #include <http_protocol.h>
61 #include <http_request.h>
63 #ifdef STANDARD20_MODULE_STUFF
64 #include <apr_strings.h>
65 #include <apr_base64.h>
67 #define ap_null_cleanup NULL
68 #define ap_register_cleanup apr_pool_cleanup_register
70 #define ap_pstrdup apr_pstrdup
71 #define ap_pstrcat apr_pstrcat
72 #define ap_pcalloc apr_pcalloc
73 #define ap_psprintf apr_psprintf
75 #define ap_base64decode_len apr_base64_decode_len
76 #define ap_base64decode apr_base64_decode
77 #define ap_base64encode_len apr_base64_encode_len
78 #define ap_base64encode apr_base64_encode
80 #define ap_table_setn apr_table_setn
81 #define ap_table_add apr_table_add
83 #define ap_pstrchr_c strchr
84 #endif /* STANDARD20_MODULE_STUFF */
87 #define vsnprintf _vsnprintf
88 #define snprintf _snprintf
91 #ifndef KRB5_LIB_FUNCTION
93 # define KRB5_LIB_FUNCTION _stdcall
95 # define KRB5_LIB_FUNCTION
103 # include <gssapi/gssapi.h>
104 # include <gssapi/gssapi_generic.h>
105 # include <gssapi/gssapi_krb5.h>
106 # define GSS_C_NT_USER_NAME gss_nt_user_name
107 # define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name
108 # define krb5_get_err_text(context,code) error_message(code)
110 #include "spnegokrb5.h"
114 /* Prevent warning about closesocket redefinition (Apache's ap_config.h and
115 * MIT Kerberos' port-sockets.h both define it as close) */
120 #include <netdb.h> /* gethostbyname() */
124 /* should be HAVE_UNISTD_H instead */
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;
162 int krb_method_gssapi;
163 int krb_method_k5pass;
167 int krb_method_k4pass;
172 set_kerb_auth_headers(request_rec *r, const kerb_auth_config *conf,
173 int use_krb4, int use_krb5pwd, char *negotiate_ret_value);
176 krb5_save_realms(cmd_parms *cmd, void *sec, const char *arg);
178 #ifdef STANDARD20_MODULE_STUFF
179 #define command(name, func, var, type, usage) \
180 AP_INIT_ ## type (name, (void*) func, \
181 (void*)APR_OFFSETOF(kerb_auth_config, var), \
182 OR_AUTHCFG | RSRC_CONF, usage)
184 #define command(name, func, var, type, usage) \
186 (void*)XtOffsetOf(kerb_auth_config, var), \
187 OR_AUTHCFG | RSRC_CONF, type, usage }
190 static const command_rec kerb_auth_cmds[] = {
191 command("KrbAuthRealms", krb5_save_realms, krb_auth_realms,
192 RAW_ARGS, "Realms to attempt authentication against (can be multiple)."),
194 command("KrbAuthRealm", krb5_save_realms, krb_auth_realms,
195 RAW_ARGS, "Alias for KrbAuthRealms."),
197 command("KrbSaveCredentials", ap_set_flag_slot, krb_save_credentials,
198 FLAG, "Save and store credentials/tickets retrieved during auth."),
200 command("KrbVerifyKDC", ap_set_flag_slot, krb_verify_kdc,
201 FLAG, "Verify tickets against keytab to prevent KDC spoofing attacks."),
203 command("KrbServiceName", ap_set_string_slot, krb_service_name,
204 TAKE1, "Service name to be used by Apache for authentication."),
206 command("KrbAuthoritative", ap_set_flag_slot, krb_authoritative,
207 FLAG, "Set to 'off' to allow access control to be passed along to lower modules iff the UserID is not known to this module."),
209 command("KrbDelegateBasic", ap_set_flag_slot, krb_delegate_basic,
210 FLAG, "Always offer Basic authentication regardless of KrbMethodK5Pass and pass on authentication to lower modules if Basic headers arrive."),
213 command("Krb5Keytab", ap_set_file_slot, krb_5_keytab,
214 TAKE1, "Location of Kerberos V5 keytab file."),
216 command("KrbMethodNegotiate", ap_set_flag_slot, krb_method_gssapi,
217 FLAG, "Enable Negotiate authentication method."),
219 command("KrbMethodK5Passwd", ap_set_flag_slot, krb_method_k5pass,
220 FLAG, "Enable Kerberos V5 password authentication."),
224 command("Krb4Srvtab", ap_set_file_slot, krb_4_srvtab,
225 TAKE1, "Location of Kerberos V4 srvtab file."),
227 command("KrbMethodK4Passwd", ap_set_flag_slot, krb_method_k4pass,
228 FLAG, "Enable Kerberos V4 password authentication."),
236 mkstemp(char *template)
241 start = strlen(template) - 1;
242 while(template[start] == 'X') {
243 template[start] = '0' + val % 10;
250 fd = open(template, O_RDWR | O_CREAT | O_EXCL, 0600);
251 if(fd >= 0 || errno != EEXIST)
258 if(template[i] == '9' + 1)
260 if(template[i] <= 'z')
269 #if defined(KRB5) && !defined(HEIMDAL)
270 /* Needed to work around problems with replay caches */
271 #include "mit-internals.h"
273 /* This is our replacement krb5_rc_store function */
274 static krb5_error_code KRB5_LIB_FUNCTION
275 mod_auth_kerb_rc_store(krb5_context context, krb5_rcache rcache,
276 krb5_donot_replay_internal *donot_replay)
281 /* And this is the operations vector for our replay cache */
282 const krb5_rc_ops_internal mod_auth_kerb_rc_ops = {
289 mod_auth_kerb_rc_store,
291 krb5_rc_dfl_get_span,
292 krb5_rc_dfl_get_name,
298 /***************************************************************************
299 Auth Configuration Initialization
300 ***************************************************************************/
301 static void *kerb_dir_create_config(MK_POOL *p, char *d)
303 kerb_auth_config *rec;
305 rec = (kerb_auth_config *) ap_pcalloc(p, sizeof(kerb_auth_config));
306 ((kerb_auth_config *)rec)->krb_verify_kdc = 1;
307 ((kerb_auth_config *)rec)->krb_service_name = "HTTP";
308 ((kerb_auth_config *)rec)->krb_authoritative = 1;
309 ((kerb_auth_config *)rec)->krb_delegate_basic = 0;
311 ((kerb_auth_config *)rec)->krb_method_k5pass = 1;
312 ((kerb_auth_config *)rec)->krb_method_gssapi = 1;
315 ((kerb_auth_config *)rec)->krb_method_k4pass = 1;
321 krb5_save_realms(cmd_parms *cmd, void *vsec, const char *arg)
323 kerb_auth_config *sec = (kerb_auth_config *) vsec;
324 sec->krb_auth_realms= ap_pstrdup(cmd->pool, arg);
329 log_rerror(const char *file, int line, int level, int status,
330 const request_rec *r, const char *fmt, ...)
336 vsnprintf(errstr, sizeof(errstr), fmt, ap);
340 #ifdef STANDARD20_MODULE_STUFF
341 ap_log_rerror(file, line, level | APLOG_NOERRNO, status, r, "%s", errstr);
343 ap_log_rerror(file, line, level | APLOG_NOERRNO, r, "%s", errstr);
348 /***************************************************************************
349 Username/Password Validation for Krb4
350 ***************************************************************************/
352 verify_krb4_user(request_rec *r, char *name, char *instance, char *realm,
353 char *password, char *linstance, char *srvtab, int krb_verify_kdc)
359 const char *hostname;
362 char lrealm[REALM_SZ];
364 ret = krb_get_pw_in_tkt(name, instance, realm, "krbtgt", realm,
365 DEFAULT_TKT_LIFE, password);
367 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
368 "Cannot get krb4 ticket: krb_get_pw_in_tkt() failed: %s",
369 krb_get_err_text(ret));
376 hostname = ap_get_server_name(r);
378 hp = gethostbyname(hostname);
381 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
382 "Cannot verify krb4 ticket: gethostbyname() failed: %s",
386 memcpy(&addr, hp->h_addr, sizeof(addr));
388 phost = krb_get_phost((char *)hostname);
390 krb_get_lrealm(lrealm, 1);
392 ret = krb_mk_req(&ticket, linstance, phost, lrealm, 0);
394 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
395 "Cannot verify krb4 ticket: krb_mk_req() failed: %s",
396 krb_get_err_text(ret));
401 ret = krb_rd_req(&ticket, linstance, phost, addr, &authdata, srvtab);
403 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
404 "Cannot verify krb4 ticket: krb_rd_req() failed: %s",
405 krb_get_err_text(ret));
413 krb4_cache_cleanup(void *data)
415 char *tkt_file = (char *) data;
417 krb_set_tkt_string(tkt_file);
423 authenticate_user_krb4pwd(request_rec *r,
424 kerb_auth_config *conf,
425 const char *auth_line)
429 const char *sent_name;
432 char *tkt_file_p = NULL;
437 char lrealm[REALM_SZ];
438 int all_principals_unkown;
440 sent_pw = ap_pbase64decode(r->pool, auth_line);
441 sent_name = ap_getword (r->pool, &sent_pw, ':');
443 /* do not allow user to override realm setting of server */
444 if (ap_strchr_c(sent_name, '@')) {
445 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
446 "specifying realm in user name is prohibited");
447 return HTTP_UNAUTHORIZED;
450 sent_instance = strchr(sent_name, '.');
452 *sent_instance++ = '\0';
454 snprintf(tkt_file, sizeof(tkt_file), "/tmp/apache_tkt_XXXXXX");
455 fd = mkstemp(tkt_file);
457 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
458 "Cannot create krb4 ccache: mkstemp() failed: %s",
460 return HTTP_INTERNAL_SERVER_ERROR;
463 tkt_file_p = ap_pstrdup(r->pool, tkt_file);
464 ap_register_cleanup(r->pool, tkt_file_p,
465 krb4_cache_cleanup, ap_null_cleanup);
467 krb_set_tkt_string(tkt_file);
469 all_principals_unkown = 1;
470 realms = conf->krb_auth_realms;
472 memset(lrealm, 0, sizeof(lrealm));
475 realm = ap_getword_white(r->pool, &realms);
478 ret = krb_get_lrealm(lrealm, 1);
484 ret = verify_krb4_user(r, (char *)sent_name,
485 (sent_instance) ? sent_instance : "",
486 (char *)realm, (char *)sent_pw,
487 conf->krb_service_name,
488 conf->krb_4_srvtab, conf->krb_verify_kdc);
489 if (!conf->krb_authoritative && ret) {
490 /* if we're not authoritative, we allow authentication to pass on
491 * to another modules if (and only if) the user is not known to us */
492 if (all_principals_unkown && ret != KDC_PR_UNKNOWN)
493 all_principals_unkown = 0;
498 } while (realms && *realms);
501 /* XXX log only in the verify_krb4_user() call */
502 log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "Verifying krb4 password failed");
503 ret = (!conf->krb_authoritative && all_principals_unkown == 1 && ret == KDC_PR_UNKNOWN) ?
504 DECLINED : HTTP_UNAUTHORIZED;
508 user = ap_pstrdup(r->pool, sent_name);
510 user = ap_pstrcat(r->pool, user, ".", sent_instance, NULL);
511 user = ap_pstrcat(r->pool, user, "@", realm, NULL);
514 MK_AUTH_TYPE = "Basic";
515 ap_table_setn(r->subprocess_env, "KRBTKFILE", tkt_file_p);
517 if (!conf->krb_save_credentials)
518 krb4_cache_cleanup(tkt_file);
522 krb4_cache_cleanup(tkt_file);
531 /***************************************************************************
532 Username/Password Validation for Krb5
533 ***************************************************************************/
535 /* MIT kerberos uses replay cache checks even during credential verification
536 * (i.e. in krb5_verify_init_creds()), which is obviosuly useless. In order to
537 * avoid problems with multiple apache processes accessing the same rcache file
538 * we had to use this call instead, which is only a bit modified version of
539 * krb5_verify_init_creds() */
540 static krb5_error_code
541 verify_krb5_init_creds(request_rec *r, krb5_context context, krb5_creds *creds,
542 krb5_principal ap_req_server, krb5_keytab ap_req_keytab)
546 krb5_ccache local_ccache = NULL;
547 krb5_creds *new_creds = NULL;
548 krb5_auth_context auth_context = NULL;
549 krb5_keytab keytab = NULL;
552 memset(&req, 0, sizeof(req));
554 if (ap_req_keytab == NULL) {
555 ret = krb5_kt_default (context, &keytab);
559 keytab = ap_req_keytab;
561 ret = krb5_cc_resolve(context, "MEMORY:", &local_ccache);
563 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
564 "krb5_cc_resolve() failed when verifying KDC");
568 ret = krb5_cc_initialize(context, local_ccache, creds->client);
570 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
571 "krb5_cc_initialize() failed when verifying KDC");
575 ret = krb5_cc_store_cred (context, local_ccache, creds);
577 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
578 "krb5_cc_initialize() failed when verifying KDC");
582 ret = krb5_unparse_name(context, ap_req_server, &server_name);
584 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
585 "krb5_unparse_name() failed when verifying KDC");
588 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
589 "Trying to verify authenticity of KDC using principal %s", server_name);
592 if (!krb5_principal_compare (context, ap_req_server, creds->server)) {
593 krb5_creds match_cred;
595 memset (&match_cred, 0, sizeof(match_cred));
597 match_cred.client = creds->client;
598 match_cred.server = ap_req_server;
600 ret = krb5_get_credentials (context, 0, local_ccache,
601 &match_cred, &new_creds);
603 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
604 "krb5_get_credentials() failed when verifying KDC");
610 ret = krb5_mk_req_extended (context, &auth_context, 0, NULL, creds, &req);
612 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
613 "krb5_mk_req_extended() failed when verifying KDC");
617 krb5_auth_con_free (context, auth_context);
619 ret = krb5_auth_con_init(context, &auth_context);
621 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
622 "krb5_auth_con_init() failed when verifying KDC");
625 /* use KRB5_AUTH_CONTEXT_DO_SEQUENCE to skip replay cache checks */
626 krb5_auth_con_setflags(context, auth_context, KRB5_AUTH_CONTEXT_DO_SEQUENCE);
628 ret = krb5_rd_req (context, &auth_context, &req, ap_req_server,
631 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
632 "krb5_rd_req() failed when verifying KDC");
638 /* XXX Do I ever want to support Heimdal 0.4 ??? */
639 krb5_data_free(&req);
641 krb5_free_data_contents(context, &req);
644 krb5_auth_con_free (context, auth_context);
646 krb5_free_creds (context, new_creds);
647 if (ap_req_keytab == NULL && keytab)
648 krb5_kt_close (context, keytab);
650 krb5_cc_destroy (context, local_ccache);
655 /* Inspired by krb5_verify_user from Heimdal */
656 static krb5_error_code
657 verify_krb5_user(request_rec *r, krb5_context context, krb5_principal principal,
658 const char *password, const char *service, krb5_keytab keytab,
659 int krb_verify_kdc, krb5_ccache *ccache)
662 krb5_principal server = NULL;
664 krb5_ccache ret_ccache = NULL;
667 /* XXX error messages shouldn't be logged here (and in the while() loop in
668 * authenticate_user_krb5pwd() as weell), in order to avoid confusing log
669 * entries when using multiple realms */
671 memset(&creds, 0, sizeof(creds));
673 ret = krb5_unparse_name(context, principal, &name);
675 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
676 "Trying to get TGT for user %s", name);
680 ret = krb5_get_init_creds_password(context, &creds, principal,
681 (char *)password, NULL,
682 NULL, 0, NULL, NULL);
684 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
685 "krb5_get_init_creds_password() failed: %s",
686 krb5_get_err_text(context, ret));
690 ret = krb5_sname_to_principal(context, ap_get_server_name(r), service,
691 KRB5_NT_SRV_HST, &server);
693 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
694 "krb5_sname_to_principal() failed: %s",
695 krb5_get_err_text(context, ret));
698 /* XXX log_debug: lookig for <server_princ> in keytab */
704 krb5_get_default_realm(context, &realm);
705 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
706 "trying to verify password using key for %s/%s@%s",
707 service, ap_get_server_name(r), realm);
711 if (krb_verify_kdc &&
712 (ret = verify_krb5_init_creds(r, context, &creds, server, keytab))) {
713 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
714 "failed to verify krb5 credentials: %s",
715 krb5_get_err_text(context, ret));
719 ret = krb5_cc_resolve(context, "MEMORY:", &ret_ccache);
721 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
722 "generating new memory ccache failed: %s",
723 krb5_get_err_text(context, ret));
727 ret = krb5_cc_initialize(context, ret_ccache, principal);
729 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
730 "krb5_cc_initialize() failed: %s",
731 krb5_get_err_text(context, ret));
735 ret = krb5_cc_store_cred(context, ret_ccache, &creds);
737 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
738 "krb5_cc_store_cred() failed: %s",
739 krb5_get_err_text(context, ret));
742 *ccache = ret_ccache;
746 krb5_free_cred_contents(context, &creds);
748 krb5_free_principal(context, server);
750 krb5_cc_destroy(context, ret_ccache);
756 krb5_cache_cleanup(void *data)
758 krb5_context context;
760 krb5_error_code problem;
761 char *cache_name = (char *) data;
763 problem = krb5_init_context(&context);
765 /* ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL, "krb5_init_context() failed"); */
766 return HTTP_INTERNAL_SERVER_ERROR;
769 problem = krb5_cc_resolve(context, cache_name, &cache);
771 /* log_error(APLOG_MARK, APLOG_ERR, 0, NULL,
772 "krb5_cc_resolve() failed (%s: %s)",
773 cache_name, krb5_get_err_text(context, problem)); */
774 return HTTP_INTERNAL_SERVER_ERROR;
777 krb5_cc_destroy(context, cache);
778 krb5_free_context(context);
783 create_krb5_ccache(krb5_context kcontext,
785 kerb_auth_config *conf,
786 krb5_principal princ,
791 krb5_error_code problem;
793 krb5_ccache tmp_ccache = NULL;
795 ccname = ap_psprintf(r->pool, "FILE:%s/krb5cc_apache_XXXXXX", P_tmpdir);
796 fd = mkstemp(ccname + strlen("FILE:"));
798 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
799 "mkstemp() failed: %s", strerror(errno));
800 ret = HTTP_INTERNAL_SERVER_ERROR;
805 problem = krb5_cc_resolve(kcontext, ccname, &tmp_ccache);
807 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
808 "krb5_cc_resolve() failed: %s",
809 krb5_get_err_text(kcontext, problem));
810 ret = HTTP_INTERNAL_SERVER_ERROR;
815 problem = krb5_cc_initialize(kcontext, tmp_ccache, princ);
817 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
818 "Cannot initialize krb5 ccache %s: krb5_cc_initialize() failed: %s",
819 ccname, krb5_get_err_text(kcontext, problem));
820 ret = HTTP_INTERNAL_SERVER_ERROR;
824 ap_table_setn(r->subprocess_env, "KRB5CCNAME", ccname);
825 ap_register_cleanup(r->pool, ccname,
826 krb5_cache_cleanup, ap_null_cleanup);
828 *ccache = tmp_ccache;
835 krb5_cc_destroy(kcontext, tmp_ccache);
841 store_krb5_creds(krb5_context kcontext,
843 kerb_auth_config *conf,
844 krb5_ccache delegated_cred)
847 krb5_error_code problem;
848 krb5_principal princ;
852 problem = krb5_cc_get_principal(kcontext, delegated_cred, &princ);
854 snprintf(errstr, sizeof(errstr), "krb5_cc_get_principal() failed: %s",
855 krb5_get_err_text(kcontext, problem));
856 return HTTP_INTERNAL_SERVER_ERROR;
859 ret = create_krb5_ccache(kcontext, r, conf, princ, &ccache);
861 krb5_free_principal(kcontext, princ);
866 problem = krb5_cc_copy_cache(kcontext, delegated_cred, ccache);
868 problem = krb5_cc_copy_creds(kcontext, delegated_cred, ccache);
870 krb5_free_principal(kcontext, princ);
872 snprintf(errstr, sizeof(errstr), "Failed to store credentials: %s",
873 krb5_get_err_text(kcontext, problem));
874 krb5_cc_destroy(kcontext, ccache);
875 return HTTP_INTERNAL_SERVER_ERROR;
878 krb5_cc_close(kcontext, ccache);
884 authenticate_user_krb5pwd(request_rec *r,
885 kerb_auth_config *conf,
886 const char *auth_line)
888 const char *sent_pw = NULL;
889 const char *sent_name = NULL;
890 const char *realms = NULL;
891 const char *realm = NULL;
892 krb5_context kcontext = NULL;
893 krb5_error_code code;
894 krb5_principal client = NULL;
895 krb5_ccache ccache = NULL;
896 krb5_keytab keytab = NULL;
899 int all_principals_unkown;
902 code = krb5_init_context(&kcontext);
904 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
905 "Cannot initialize Kerberos5 context (%d)", code);
906 return HTTP_INTERNAL_SERVER_ERROR;
909 sent_pw = ap_pbase64decode(r->pool, auth_line);
910 sent_name = ap_getword (r->pool, &sent_pw, ':');
912 if (sent_pw == NULL || *sent_pw == '\0') {
913 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
914 "empty passwords are not accepted");
915 ret = HTTP_UNAUTHORIZED;
919 if (conf->krb_5_keytab)
920 krb5_kt_resolve(kcontext, conf->krb_5_keytab, &keytab);
922 p = strchr(sent_name, '@');
925 if (conf->krb_auth_realms && !ap_find_token(r->pool, conf->krb_auth_realms, p)) {
926 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
927 "Specified realm `%s' not allowed by configuration", p);
928 ret = HTTP_UNAUTHORIZED;
933 realms = (p) ? p : conf->krb_auth_realms;
934 all_principals_unkown = 1;
936 name = (char *) sent_name;
937 if (realms && (realm = ap_getword_white(r->pool, &realms)))
938 name = ap_psprintf(r->pool, "%s@%s", sent_name, realm);
941 krb5_free_principal(kcontext, client);
945 code = krb5_parse_name(kcontext, name, &client);
947 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
948 "krb5_parse_name() failed: %s",
949 krb5_get_err_text(kcontext, code));
953 code = verify_krb5_user(r, kcontext, client, sent_pw,
954 conf->krb_service_name,
955 keytab, conf->krb_verify_kdc, &ccache);
956 if (!conf->krb_authoritative && code) {
957 /* if we're not authoritative, we allow authentication to pass on
958 * to another modules if (and only if) the user is not known to us */
959 if (all_principals_unkown && code != KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN)
960 all_principals_unkown = 0;
966 /* ap_getword_white() used above shifts the parameter, so it's not
967 needed to touch the realms variable */
968 } while (realms && *realms);
970 memset((char *)sent_pw, 0, strlen(sent_pw));
973 if (!conf->krb_authoritative && all_principals_unkown == 1 && code == KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN)
976 ret = HTTP_UNAUTHORIZED;
981 code = krb5_unparse_name(kcontext, client, &name);
983 log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "krb5_unparse_name() failed: %s",
984 krb5_get_err_text(kcontext, code));
985 ret = HTTP_UNAUTHORIZED;
988 MK_USER = ap_pstrdup (r->pool, name);
989 MK_AUTH_TYPE = "Basic";
992 if (conf->krb_save_credentials)
993 store_krb5_creds(kcontext, r, conf, ccache);
998 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
999 "kerb_authenticate_user_krb5pwd ret=%d user=%s authtype=%s",
1000 ret, (MK_USER)?MK_USER:"(NULL)", (MK_AUTH_TYPE)?MK_AUTH_TYPE:"(NULL)");
1002 krb5_free_principal(kcontext, client);
1004 krb5_cc_destroy(kcontext, ccache);
1006 krb5_kt_close(kcontext, keytab);
1007 krb5_free_context(kcontext);
1012 /*********************************************************************
1013 * GSSAPI Authentication
1014 ********************************************************************/
1017 get_gss_error(MK_POOL *p, OM_uint32 err_maj, OM_uint32 err_min, char *prefix)
1019 OM_uint32 maj_stat, min_stat;
1020 OM_uint32 msg_ctx = 0;
1021 gss_buffer_desc status_string;
1024 err_msg = ap_pstrdup(p, prefix);
1026 maj_stat = gss_display_status (&min_stat,
1032 if (GSS_ERROR(maj_stat))
1034 err_msg = ap_pstrcat(p, err_msg, ": ", (char*) status_string.value, NULL);
1035 gss_release_buffer(&min_stat, &status_string);
1037 maj_stat = gss_display_status (&min_stat,
1043 if (!GSS_ERROR(maj_stat)) {
1044 err_msg = ap_pstrcat(p, err_msg,
1045 " (", (char*) status_string.value, ")", NULL);
1046 gss_release_buffer(&min_stat, &status_string);
1048 } while (!GSS_ERROR(maj_stat) && msg_ctx != 0);
1054 store_gss_creds(request_rec *r, kerb_auth_config *conf, char *princ_name,
1055 gss_cred_id_t delegated_cred)
1057 OM_uint32 maj_stat, min_stat;
1058 krb5_principal princ = NULL;
1059 krb5_ccache ccache = NULL;
1060 krb5_error_code problem;
1061 krb5_context context;
1062 int ret = HTTP_INTERNAL_SERVER_ERROR;
1064 problem = krb5_init_context(&context);
1066 log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "Cannot initialize krb5 context");
1067 return HTTP_INTERNAL_SERVER_ERROR;
1070 problem = krb5_parse_name(context, princ_name, &princ);
1072 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1073 "Cannot parse delegated username (%s)", krb5_get_err_text(context, problem));
1077 problem = create_krb5_ccache(context, r, conf, princ, &ccache);
1079 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1080 "Cannot create krb5 ccache (%s)", krb5_get_err_text(context, problem));
1084 maj_stat = gss_krb5_copy_ccache(&min_stat, delegated_cred, ccache);
1085 if (GSS_ERROR(maj_stat)) {
1086 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1087 "Cannot store delegated credential (%s)",
1088 get_gss_error(r->pool, maj_stat, min_stat, "gss_krb5_copy_ccache"));
1092 krb5_cc_close(context, ccache);
1098 krb5_free_principal(context, princ);
1100 krb5_cc_destroy(context, ccache);
1101 krb5_free_context(context);
1106 get_gss_creds(request_rec *r,
1107 kerb_auth_config *conf,
1108 gss_cred_id_t *server_creds)
1110 gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
1111 OM_uint32 major_status, minor_status, minor_status2;
1112 gss_name_t server_name = GSS_C_NO_NAME;
1115 snprintf(buf, sizeof(buf), "%s@%s", conf->krb_service_name,
1116 ap_get_server_name(r));
1119 token.length = strlen(buf) + 1;
1121 major_status = gss_import_name(&minor_status, &token,
1122 GSS_C_NT_HOSTBASED_SERVICE,
1124 memset(&token, 0, sizeof(token));
1125 if (GSS_ERROR(major_status)) {
1126 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1127 "%s", get_gss_error(r->pool, major_status, minor_status,
1128 "gss_import_name() failed"));
1129 return HTTP_INTERNAL_SERVER_ERROR;
1132 major_status = gss_display_name(&minor_status, server_name, &token, NULL);
1133 if (GSS_ERROR(major_status)) {
1134 /* Perhaps we could just ignore this error but it's safer to give up now,
1136 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1137 "%s", get_gss_error(r->pool, major_status, minor_status,
1138 "gss_display_name() failed"));
1139 return HTTP_INTERNAL_SERVER_ERROR;
1142 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "Acquiring creds for %s",
1144 gss_release_buffer(&minor_status, &token);
1146 major_status = gss_acquire_cred(&minor_status, server_name, GSS_C_INDEFINITE,
1147 GSS_C_NO_OID_SET, GSS_C_ACCEPT,
1148 server_creds, NULL, NULL);
1149 gss_release_name(&minor_status2, &server_name);
1150 if (GSS_ERROR(major_status)) {
1151 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1152 "%s", get_gss_error(r->pool, major_status, minor_status,
1153 "gss_acquire_cred() failed"));
1154 return HTTP_INTERNAL_SERVER_ERROR;
1159 * With MIT Kerberos 5 1.3.x the gss_cred_id_t is the same as
1160 * krb5_gss_cred_id_t and krb5_gss_cred_id_rec contains a pointer to
1162 * This allows us to override the replay cache function vector with
1164 * Note that this is a dirty hack to get things working and there may
1165 * well be unknown side-effects.
1168 krb5_gss_cred_id_t gss_creds = (krb5_gss_cred_id_t) *server_creds;
1170 if (gss_creds && gss_creds->rcache && gss_creds->rcache->ops &&
1171 gss_creds->rcache->ops->type &&
1172 memcmp(gss_creds->rcache->ops->type, "dfl", 3) == 0)
1173 /* Override the rcache operations */
1174 gss_creds->rcache->ops = &mod_auth_kerb_rc_ops;
1182 cmp_gss_type(gss_buffer_t token, gss_OID oid)
1187 if (token->length == 0)
1188 return GSS_S_DEFECTIVE_TOKEN;
1192 return GSS_S_DEFECTIVE_TOKEN;
1195 if ((len & 0x7f) > 4)
1196 return GSS_S_DEFECTIVE_TOKEN;
1200 return GSS_S_DEFECTIVE_TOKEN;
1202 if (((OM_uint32) *p++) != oid->length)
1203 return GSS_S_DEFECTIVE_TOKEN;
1205 return memcmp(p, oid->elements, oid->length);
1209 authenticate_user_gss(request_rec *r, kerb_auth_config *conf,
1210 const char *auth_line, char **negotiate_ret_value)
1212 OM_uint32 major_status, minor_status, minor_status2;
1213 gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
1214 gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
1215 const char *auth_param = NULL;
1217 gss_name_t client_name = GSS_C_NO_NAME;
1218 gss_cred_id_t delegated_cred = GSS_C_NO_CREDENTIAL;
1219 OM_uint32 (KRB5_LIB_FUNCTION *accept_sec_token)
1220 (OM_uint32 *, gss_ctx_id_t *, const gss_cred_id_t,
1221 const gss_buffer_t, const gss_channel_bindings_t,
1222 gss_name_t *, gss_OID *, gss_buffer_t, OM_uint32 *,
1223 OM_uint32 *, gss_cred_id_t *);
1224 gss_OID_desc spnego_oid;
1225 gss_ctx_id_t context = GSS_C_NO_CONTEXT;
1226 gss_cred_id_t server_creds = GSS_C_NO_CREDENTIAL;
1228 *negotiate_ret_value = "\0";
1230 spnego_oid.length = 6;
1231 spnego_oid.elements = (void *)"\x2b\x06\x01\x05\x05\x02";
1233 if (conf->krb_5_keytab) {
1235 /* we don't use the ap_* calls here, since the string passed to putenv()
1236 * will become part of the enviroment and shouldn't be free()ed by apache
1238 ktname = malloc(strlen("KRB5_KTNAME=") + strlen(conf->krb_5_keytab) + 1);
1239 if (ktname == NULL) {
1240 log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "malloc() failed: not enough memory");
1241 ret = HTTP_INTERNAL_SERVER_ERROR;
1244 sprintf(ktname, "KRB5_KTNAME=%s", conf->krb_5_keytab);
1247 /* Seems to be also supported by latest MIT */
1248 gsskrb5_register_acceptor_identity(conf->krb_5_keytab);
1252 ret = get_gss_creds(r, conf, &server_creds);
1256 /* ap_getword() shifts parameter */
1257 auth_param = ap_getword_white(r->pool, &auth_line);
1258 if (auth_param == NULL) {
1259 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1260 "No Authorization parameter in request from client");
1261 ret = HTTP_UNAUTHORIZED;
1265 input_token.length = ap_base64decode_len(auth_param) + 1;
1266 input_token.value = ap_pcalloc(r->connection->pool, input_token.length);
1267 if (input_token.value == NULL) {
1268 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1269 "ap_pcalloc() failed (not enough memory)");
1270 ret = HTTP_INTERNAL_SERVER_ERROR;
1273 input_token.length = ap_base64decode(input_token.value, auth_param);
1275 accept_sec_token = (cmp_gss_type(&input_token, &spnego_oid) == 0) ?
1276 gss_accept_sec_context_spnego : gss_accept_sec_context;
1278 /* pridat: Read client Negotiate data of length XXX, prefix YYY */
1279 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "Verifying client data using %s",
1280 (accept_sec_token == gss_accept_sec_context)
1282 : "SPNEGO GSS-API");
1284 major_status = accept_sec_token(&minor_status,
1288 GSS_C_NO_CHANNEL_BINDINGS,
1295 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1296 "Verification returned code %d", major_status);
1297 if (output_token.length) {
1301 len = ap_base64encode_len(output_token.length) + 1;
1302 token = ap_pcalloc(r->connection->pool, len + 1);
1303 if (token == NULL) {
1304 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1305 "ap_pcalloc() failed (not enough memory)");
1306 ret = HTTP_INTERNAL_SERVER_ERROR;
1307 gss_release_buffer(&minor_status2, &output_token);
1310 ap_base64encode(token, output_token.value, output_token.length);
1312 *negotiate_ret_value = token;
1313 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1314 "GSS-API token of length %d bytes will be sent back",
1315 output_token.length);
1316 gss_release_buffer(&minor_status2, &output_token);
1317 set_kerb_auth_headers(r, conf, 0, 0, *negotiate_ret_value);
1320 if (GSS_ERROR(major_status)) {
1321 if (input_token.length > 7 && memcmp(input_token.value, "NTLMSSP", 7) == 0)
1322 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1323 "Warning: received token seems to be NTLM, which isn't supported by the Kerberos module. Check your IE configuration.");
1325 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1326 "%s", get_gss_error(r->pool, major_status, minor_status,
1327 "gss_accept_sec_context() failed"));
1328 /* Don't offer the Negotiate method again if call to GSS layer failed */
1329 *negotiate_ret_value = NULL;
1330 ret = HTTP_UNAUTHORIZED;
1335 /* This is a _Kerberos_ module so multiple authentication rounds aren't
1336 * supported. If we wanted a generic GSS authentication we would have to do
1337 * some magic with exporting context etc. */
1338 if (major_status & GSS_S_CONTINUE_NEEDED) {
1339 ret = HTTP_UNAUTHORIZED;
1344 major_status = gss_display_name(&minor_status, client_name, &output_token, NULL);
1345 gss_release_name(&minor_status, &client_name);
1346 if (GSS_ERROR(major_status)) {
1347 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1348 "%s", get_gss_error(r->pool, major_status, minor_status,
1349 "gss_export_name() failed"));
1350 ret = HTTP_INTERNAL_SERVER_ERROR;
1354 MK_AUTH_TYPE = MECH_NEGOTIATE;
1355 MK_USER = ap_pstrdup(r->pool, output_token.value);
1357 if (conf->krb_save_credentials && delegated_cred != GSS_C_NO_CREDENTIAL)
1358 store_gss_creds(r, conf, (char *)output_token.value, delegated_cred);
1360 gss_release_buffer(&minor_status, &output_token);
1366 gss_release_cred(&minor_status, &delegated_cred);
1368 if (output_token.length)
1369 gss_release_buffer(&minor_status, &output_token);
1371 if (client_name != GSS_C_NO_NAME)
1372 gss_release_name(&minor_status, &client_name);
1374 if (server_creds != GSS_C_NO_CREDENTIAL)
1375 gss_release_cred(&minor_status, &server_creds);
1377 if (context != GSS_C_NO_CONTEXT)
1378 gss_delete_sec_context(&minor_status, &context, GSS_C_NO_BUFFER);
1385 already_succeeded(request_rec *r)
1387 if (ap_is_initial_req(r) || MK_AUTH_TYPE == NULL)
1389 if (strcmp(MK_AUTH_TYPE, MECH_NEGOTIATE) ||
1390 (strcmp(MK_AUTH_TYPE, "Basic") && strchr(MK_USER, '@')))
1396 set_kerb_auth_headers(request_rec *r, const kerb_auth_config *conf,
1397 int use_krb4, int use_krb5pwd, char *negotiate_ret_value)
1399 const char *auth_name = NULL;
1401 char *negoauth_param;
1402 const char *header_name =
1403 (r->proxyreq == PROXYREQ_PROXY) ? "Proxy-Authenticate" : "WWW-Authenticate";
1405 /* get the user realm specified in .htaccess */
1406 auth_name = ap_auth_name(r);
1408 /* XXX should the WWW-Authenticate header be cleared first?
1409 * apache in the proxy mode should retain client's authN headers? */
1411 if (negotiate_ret_value != NULL && conf->krb_method_gssapi) {
1412 negoauth_param = (*negotiate_ret_value == '\0') ? MECH_NEGOTIATE :
1413 ap_pstrcat(r->pool, MECH_NEGOTIATE " ", negotiate_ret_value, NULL);
1414 ap_table_add(r->err_headers_out, header_name, negoauth_param);
1416 if ((use_krb5pwd && conf->krb_method_k5pass) || conf->krb_delegate_basic) {
1417 ap_table_add(r->err_headers_out, header_name,
1418 ap_pstrcat(r->pool, "Basic realm=\"", auth_name, "\"", NULL));
1425 ((use_krb4 && conf->krb_method_k4pass) || conf->krb_delegate_basic))
1426 ap_table_add(r->err_headers_out, header_name,
1427 ap_pstrcat(r->pool, "Basic realm=\"", auth_name, "\"", NULL));
1432 kerb_authenticate_user(request_rec *r)
1434 kerb_auth_config *conf =
1435 (kerb_auth_config *) ap_get_module_config(r->per_dir_config,
1437 const char *auth_type = NULL;
1438 const char *auth_line = NULL;
1439 const char *type = NULL;
1440 int use_krb5 = 0, use_krb4 = 0;
1442 static int last_return = HTTP_UNAUTHORIZED;
1443 char *negotiate_ret_value = NULL;
1445 /* get the type specified in .htaccess */
1446 type = ap_auth_type(r);
1448 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1449 "kerb_authenticate_user entered with user %s and auth_type %s",
1450 (MK_USER)?MK_USER:"(NULL)",type?type:"(NULL)");
1452 if (type && strcasecmp(type, "Kerberos") == 0)
1453 use_krb5 = use_krb4 = 1;
1454 else if(type && strcasecmp(type, "KerberosV5") == 0)
1456 else if(type && strcasecmp(type, "KerberosV4") == 0)
1461 /* get what the user sent us in the HTTP header */
1462 auth_line = MK_TABLE_GET(r->headers_in, (r->proxyreq == PROXYREQ_PROXY)
1463 ? "Proxy-Authorization"
1466 set_kerb_auth_headers(r, conf, use_krb4, use_krb5,
1467 (use_krb5) ? "\0" : NULL);
1468 return HTTP_UNAUTHORIZED;
1470 auth_type = ap_getword_white(r->pool, &auth_line);
1472 /* If we are delegating Basic to other modules, DECLINE the request */
1473 if (conf->krb_delegate_basic &&
1475 !conf->krb_method_k5pass &&
1478 !conf->krb_method_k4pass &&
1480 (strcasecmp(auth_type, "Basic") == 0))
1483 if (already_succeeded(r))
1486 ret = HTTP_UNAUTHORIZED;
1489 if (use_krb5 && conf->krb_method_gssapi &&
1490 strcasecmp(auth_type, MECH_NEGOTIATE) == 0) {
1491 ret = authenticate_user_gss(r, conf, auth_line, &negotiate_ret_value);
1492 } else if (use_krb5 && conf->krb_method_k5pass &&
1493 strcasecmp(auth_type, "Basic") == 0) {
1494 ret = authenticate_user_krb5pwd(r, conf, auth_line);
1499 if (ret == HTTP_UNAUTHORIZED && use_krb4 && conf->krb_method_k4pass &&
1500 strcasecmp(auth_type, "Basic") == 0)
1501 ret = authenticate_user_krb4pwd(r, conf, auth_line);
1504 if (ret == HTTP_UNAUTHORIZED)
1505 set_kerb_auth_headers(r, conf, use_krb4, use_krb5, negotiate_ret_value);
1507 /* XXX log_debug: if ret==OK, log(user XY authenticated) */
1514 /***************************************************************************
1515 Module Setup/Configuration
1516 ***************************************************************************/
1517 #ifndef STANDARD20_MODULE_STUFF
1518 module MODULE_VAR_EXPORT auth_kerb_module = {
1519 STANDARD_MODULE_STUFF,
1520 NULL, /* module initializer */
1521 kerb_dir_create_config, /* per-directory config creator */
1522 NULL, /* per-directory config merger */
1523 NULL, /* per-server config creator */
1524 NULL, /* per-server config merger */
1525 kerb_auth_cmds, /* command table */
1526 NULL, /* [ 9] content handlers */
1527 NULL, /* [ 2] URI-to-filename translation */
1528 kerb_authenticate_user, /* [ 5] check/validate user_id */
1529 NULL, /* [ 6] check user_id is valid *here* */
1530 NULL, /* [ 4] check access by host address */
1531 NULL, /* [ 7] MIME type checker/setter */
1532 NULL, /* [ 8] fixups */
1533 NULL, /* [10] logger */
1534 NULL, /* [ 3] header parser */
1535 NULL, /* process initialization */
1536 NULL, /* process exit/cleanup */
1537 NULL /* [ 1] post read_request handling */
1539 ,NULL, /* EAPI: add_module */
1540 NULL, /* EAPI: remove_module */
1541 NULL, /* EAPI: rewrite_command */
1542 NULL /* EAPI: new_connection */
1547 kerb_init_handler(apr_pool_t *p, apr_pool_t *plog,
1548 apr_pool_t *ptemp, server_rec *s)
1550 ap_add_version_component(p, "mod_auth_kerb/" MODAUTHKERB_VERSION);
1555 kerb_register_hooks(apr_pool_t *p)
1557 ap_hook_post_config(kerb_init_handler, NULL, NULL, APR_HOOK_MIDDLE);
1558 ap_hook_check_user_id(kerb_authenticate_user, NULL, NULL, APR_HOOK_MIDDLE);
1561 module AP_MODULE_DECLARE_DATA auth_kerb_module =
1563 STANDARD20_MODULE_STUFF,
1564 kerb_dir_create_config, /* create per-dir conf structures */
1565 NULL, /* merge per-dir conf structures */
1566 NULL, /* create per-server conf structures */
1567 NULL, /* merge per-server conf structures */
1568 kerb_auth_cmds, /* table of configuration directives */
1569 kerb_register_hooks /* register hooks */