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
84 #define ap_pstrchr_c strchr
92 # include <gssapi/gssapi.h>
93 # include <gssapi/gssapi_generic.h>
94 # include <gssapi/gssapi_krb5.h>
95 # define GSS_C_NT_USER_NAME gss_nt_user_name
96 # define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name
97 # define krb5_get_err_text(context,code) error_message(code)
99 #include "spnegokrb5.h"
103 /* Prevent warning about closesocket redefinition (Apache's ap_config.h and
104 * MIT Kerberos' port-sockets.h both define it as close) */
109 #include <netdb.h> /* gethostbyname() */
113 #define vsnprintf _vsnprintf
114 #define snprintf _snprintf
116 /* XXX remove dependency on unistd.h ??? */
120 #ifdef STANDARD20_MODULE_STUFF
121 module AP_MODULE_DECLARE_DATA auth_kerb_module;
123 module auth_kerb_module;
126 /***************************************************************************
127 Macros To Ease Compatibility
128 ***************************************************************************/
129 #ifdef STANDARD20_MODULE_STUFF
130 #define MK_POOL apr_pool_t
131 #define MK_TABLE_GET apr_table_get
132 #define MK_USER r->user
133 #define MK_AUTH_TYPE r->ap_auth_type
136 #define MK_TABLE_GET ap_table_get
137 #define MK_USER r->connection->user
138 #define MK_AUTH_TYPE r->connection->ap_auth_type
139 #define PROXYREQ_PROXY STD_PROXY
142 /***************************************************************************
143 Auth Configuration Structure
144 ***************************************************************************/
146 char *krb_auth_realms;
147 int krb_save_credentials;
149 char *krb_service_name;
150 int krb_authoritative;
151 int krb_delegate_basic;
154 int krb_method_gssapi;
155 int krb_method_k5pass;
159 int krb_method_k4pass;
164 set_kerb_auth_headers(request_rec *r, const kerb_auth_config *conf,
165 int use_krb4, int use_krb5pwd, char *negotiate_ret_value);
168 krb5_save_realms(cmd_parms *cmd, void *sec, const char *arg);
170 #ifdef STANDARD20_MODULE_STUFF
171 #define command(name, func, var, type, usage) \
172 AP_INIT_ ## type (name, (void*) func, \
173 (void*)APR_OFFSETOF(kerb_auth_config, var), \
174 OR_AUTHCFG | RSRC_CONF, usage)
176 #define command(name, func, var, type, usage) \
178 (void*)XtOffsetOf(kerb_auth_config, var), \
179 OR_AUTHCFG | RSRC_CONF, type, usage }
182 static const command_rec kerb_auth_cmds[] = {
183 command("KrbAuthRealms", krb5_save_realms, krb_auth_realms,
184 RAW_ARGS, "Realms to attempt authentication against (can be multiple)."),
186 command("KrbAuthRealm", krb5_save_realms, krb_auth_realms,
187 RAW_ARGS, "Alias for KrbAuthRealms."),
189 command("KrbSaveCredentials", ap_set_flag_slot, krb_save_credentials,
190 FLAG, "Save and store credentials/tickets retrieved during auth."),
192 command("KrbVerifyKDC", ap_set_flag_slot, krb_verify_kdc,
193 FLAG, "Verify tickets against keytab to prevent KDC spoofing attacks."),
195 command("KrbServiceName", ap_set_string_slot, krb_service_name,
196 TAKE1, "Service name to be used by Apache for authentication."),
198 command("KrbAuthoritative", ap_set_flag_slot, krb_authoritative,
199 FLAG, "Set to 'off' to allow access control to be passed along to lower modules iff the UserID is not known to this module."),
201 command("KrbDelegateBasic", ap_set_flag_slot, krb_delegate_basic,
202 FLAG, "Always offer Basic authentication regardless of KrbMethodK5Pass and pass on authentication to lower modules if Basic headers arrive."),
205 command("Krb5Keytab", ap_set_file_slot, krb_5_keytab,
206 TAKE1, "Location of Kerberos V5 keytab file."),
208 command("KrbMethodNegotiate", ap_set_flag_slot, krb_method_gssapi,
209 FLAG, "Enable Negotiate authentication method."),
211 command("KrbMethodK5Passwd", ap_set_flag_slot, krb_method_k5pass,
212 FLAG, "Enable Kerberos V5 password authentication."),
216 command("Krb4Srvtab", ap_set_file_slot, krb_4_srvtab,
217 TAKE1, "Location of Kerberos V4 srvtab file."),
219 command("KrbMethodK4Passwd", ap_set_flag_slot, krb_method_k4pass,
220 FLAG, "Enable Kerberos V4 password authentication."),
228 mkstemp(char *template)
233 start = strlen(template) - 1;
234 while(template[start] == 'X') {
235 template[start] = '0' + val % 10;
242 fd = open(template, O_RDWR | O_CREAT | O_EXCL, 0600);
243 if(fd >= 0 || errno != EEXIST)
250 if(template[i] == '9' + 1)
252 if(template[i] <= 'z')
261 #if defined(KRB5) && !defined(HEIMDAL)
262 /* Needed to work around problems with replay caches */
263 #include "mit-internals.h"
265 /* This is our replacement krb5_rc_store function */
266 static krb5_error_code
267 mod_auth_kerb_rc_store(krb5_context context, krb5_rcache rcache,
268 krb5_donot_replay_internal *donot_replay)
273 /* And this is the operations vector for our replay cache */
274 const krb5_rc_ops_internal mod_auth_kerb_rc_ops = {
281 mod_auth_kerb_rc_store,
283 krb5_rc_dfl_get_span,
284 krb5_rc_dfl_get_name,
290 /***************************************************************************
291 Auth Configuration Initialization
292 ***************************************************************************/
293 static void *kerb_dir_create_config(MK_POOL *p, char *d)
295 kerb_auth_config *rec;
297 rec = (kerb_auth_config *) ap_pcalloc(p, sizeof(kerb_auth_config));
298 ((kerb_auth_config *)rec)->krb_verify_kdc = 1;
299 ((kerb_auth_config *)rec)->krb_service_name = "HTTP";
300 ((kerb_auth_config *)rec)->krb_authoritative = 1;
301 ((kerb_auth_config *)rec)->krb_delegate_basic = 0;
303 ((kerb_auth_config *)rec)->krb_method_k5pass = 1;
304 ((kerb_auth_config *)rec)->krb_method_gssapi = 1;
307 ((kerb_auth_config *)rec)->krb_method_k4pass = 1;
313 krb5_save_realms(cmd_parms *cmd, void *vsec, const char *arg)
315 kerb_auth_config *sec = (kerb_auth_config *) vsec;
316 sec->krb_auth_realms= ap_pstrdup(cmd->pool, arg);
321 log_rerror(const char *file, int line, int level, int status,
322 const request_rec *r, const char *fmt, ...)
328 vsnprintf(errstr, sizeof(errstr), fmt, ap);
332 #ifdef STANDARD20_MODULE_STUFF
333 ap_log_rerror(file, line, level | APLOG_NOERRNO, status, r, "%s", errstr);
335 ap_log_rerror(file, line, level | APLOG_NOERRNO, r, "%s", errstr);
340 /***************************************************************************
341 Username/Password Validation for Krb4
342 ***************************************************************************/
344 verify_krb4_user(request_rec *r, char *name, char *instance, char *realm,
345 char *password, char *linstance, char *srvtab, int krb_verify_kdc)
351 const char *hostname;
354 char lrealm[REALM_SZ];
356 ret = krb_get_pw_in_tkt(name, instance, realm, "krbtgt", realm,
357 DEFAULT_TKT_LIFE, password);
359 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
360 "Cannot get krb4 ticket: krb_get_pw_in_tkt() failed: %s",
361 krb_get_err_text(ret));
368 hostname = ap_get_server_name(r);
370 hp = gethostbyname(hostname);
373 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
374 "Cannot verify krb4 ticket: gethostbyname() failed: %s",
378 memcpy(&addr, hp->h_addr, sizeof(addr));
380 phost = krb_get_phost((char *)hostname);
382 krb_get_lrealm(lrealm, 1);
384 ret = krb_mk_req(&ticket, linstance, phost, lrealm, 0);
386 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
387 "Cannot verify krb4 ticket: krb_mk_req() failed: %s",
388 krb_get_err_text(ret));
393 ret = krb_rd_req(&ticket, linstance, phost, addr, &authdata, srvtab);
395 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
396 "Cannot verify krb4 ticket: krb_rd_req() failed: %s",
397 krb_get_err_text(ret));
405 krb4_cache_cleanup(void *data)
407 char *tkt_file = (char *) data;
409 krb_set_tkt_string(tkt_file);
415 authenticate_user_krb4pwd(request_rec *r,
416 kerb_auth_config *conf,
417 const char *auth_line)
421 const char *sent_name;
424 char *tkt_file_p = NULL;
429 char lrealm[REALM_SZ];
430 int all_principals_unkown;
432 sent_pw = ap_pbase64decode(r->pool, auth_line);
433 sent_name = ap_getword (r->pool, &sent_pw, ':');
435 /* do not allow user to override realm setting of server */
436 if (ap_strchr_c(sent_name, '@')) {
437 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
438 "specifying realm in user name is prohibited");
439 return HTTP_UNAUTHORIZED;
442 sent_instance = strchr(sent_name, '.');
444 *sent_instance++ = '\0';
446 snprintf(tkt_file, sizeof(tkt_file), "/tmp/apache_tkt_XXXXXX");
447 fd = mkstemp(tkt_file);
449 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
450 "Cannot create krb4 ccache: mkstemp() failed: %s",
452 return HTTP_INTERNAL_SERVER_ERROR;
455 tkt_file_p = ap_pstrdup(r->pool, tkt_file);
456 ap_register_cleanup(r->pool, tkt_file_p,
457 krb4_cache_cleanup, ap_null_cleanup);
459 krb_set_tkt_string(tkt_file);
461 all_principals_unkown = 1;
462 realms = conf->krb_auth_realms;
464 memset(lrealm, 0, sizeof(lrealm));
467 realm = ap_getword_white(r->pool, &realms);
470 ret = krb_get_lrealm(lrealm, 1);
476 ret = verify_krb4_user(r, (char *)sent_name,
477 (sent_instance) ? sent_instance : "",
478 (char *)realm, (char *)sent_pw,
479 conf->krb_service_name,
480 conf->krb_4_srvtab, conf->krb_verify_kdc);
481 if (!conf->krb_authoritative && ret) {
482 /* if we're not authoritative, we allow authentication to pass on
483 * to another modules if (and only if) the user is not known to us */
484 if (all_principals_unkown && ret != KDC_PR_UNKNOWN)
485 all_principals_unkown = 0;
490 } while (realms && *realms);
493 /* XXX log only in the verify_krb4_user() call */
494 log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "Verifying krb4 password failed");
495 ret = (!conf->krb_authoritative && all_principals_unkown == 1 && ret == KDC_PR_UNKNOWN) ?
496 DECLINED : HTTP_UNAUTHORIZED;
500 user = ap_pstrdup(r->pool, sent_name);
502 user = ap_pstrcat(r->pool, user, ".", sent_instance, NULL);
503 user = ap_pstrcat(r->pool, user, "@", realm, NULL);
506 MK_AUTH_TYPE = "Basic";
507 ap_table_setn(r->subprocess_env, "KRBTKFILE", tkt_file_p);
509 if (!conf->krb_save_credentials)
510 krb4_cache_cleanup(tkt_file);
514 krb4_cache_cleanup(tkt_file);
523 /***************************************************************************
524 Username/Password Validation for Krb5
525 ***************************************************************************/
527 /* MIT kerberos uses replay cache checks even during credential verification
528 * (i.e. in krb5_verify_init_creds()), which is obviosuly useless. In order to
529 * avoid problems with multiple apache processes accessing the same rcache file
530 * we had to use this call instead, which is only a bit modified version of
531 * krb5_verify_init_creds() */
532 static krb5_error_code
533 verify_krb5_init_creds(request_rec *r, krb5_context context, krb5_creds *creds,
534 krb5_principal ap_req_server, krb5_keytab ap_req_keytab)
538 krb5_ccache local_ccache = NULL;
539 krb5_creds *new_creds = NULL;
540 krb5_auth_context auth_context = NULL;
541 krb5_keytab keytab = NULL;
544 memset(&req, 0, sizeof(req));
546 if (ap_req_keytab == NULL) {
547 ret = krb5_kt_default (context, &keytab);
551 keytab = ap_req_keytab;
553 ret = krb5_cc_resolve(context, "MEMORY:", &local_ccache);
555 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
556 "krb5_cc_resolve() failed when verifying KDC");
560 ret = krb5_cc_initialize(context, local_ccache, creds->client);
562 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
563 "krb5_cc_initialize() failed when verifying KDC");
567 ret = krb5_cc_store_cred (context, local_ccache, creds);
569 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
570 "krb5_cc_initialize() failed when verifying KDC");
574 ret = krb5_unparse_name(context, ap_req_server, &server_name);
576 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
577 "krb5_unparse_name() failed when verifying KDC");
580 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
581 "Trying to verify authenticity of KDC using principal %s", server_name);
584 if (!krb5_principal_compare (context, ap_req_server, creds->server)) {
585 krb5_creds match_cred;
587 memset (&match_cred, 0, sizeof(match_cred));
589 match_cred.client = creds->client;
590 match_cred.server = ap_req_server;
592 ret = krb5_get_credentials (context, 0, local_ccache,
593 &match_cred, &new_creds);
595 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
596 "krb5_get_credentials() failed when verifying KDC");
602 ret = krb5_mk_req_extended (context, &auth_context, 0, NULL, creds, &req);
604 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
605 "krb5_mk_req_extended() failed when verifying KDC");
609 krb5_auth_con_free (context, auth_context);
611 ret = krb5_auth_con_init(context, &auth_context);
613 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
614 "krb5_auth_con_init() failed when verifying KDC");
617 /* use KRB5_AUTH_CONTEXT_DO_SEQUENCE to skip replay cache checks */
618 krb5_auth_con_setflags(context, auth_context, KRB5_AUTH_CONTEXT_DO_SEQUENCE);
620 ret = krb5_rd_req (context, &auth_context, &req, ap_req_server,
623 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
624 "krb5_rd_req() failed when verifying KDC");
630 /* XXX Do I ever want to support Heimdal 0.4 ??? */
631 krb5_data_free(&req);
633 krb5_free_data_contents(context, &req);
636 krb5_auth_con_free (context, auth_context);
638 krb5_free_creds (context, new_creds);
639 if (ap_req_keytab == NULL && keytab)
640 krb5_kt_close (context, keytab);
642 krb5_cc_destroy (context, local_ccache);
647 /* Inspired by krb5_verify_user from Heimdal */
648 static krb5_error_code
649 verify_krb5_user(request_rec *r, krb5_context context, krb5_principal principal,
650 const char *password, const char *service, krb5_keytab keytab,
651 int krb_verify_kdc, krb5_ccache *ccache)
654 krb5_principal server = NULL;
656 krb5_ccache ret_ccache = NULL;
659 /* XXX error messages shouldn't be logged here (and in the while() loop in
660 * authenticate_user_krb5pwd() as weell), in order to avoid confusing log
661 * entries when using multiple realms */
663 memset(&creds, 0, sizeof(creds));
665 ret = krb5_unparse_name(context, principal, &name);
667 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
668 "Trying to get TGT for user %s", name);
672 ret = krb5_get_init_creds_password(context, &creds, principal,
673 (char *)password, NULL,
674 NULL, 0, NULL, NULL);
676 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
677 "krb5_get_init_creds_password() failed: %s",
678 krb5_get_err_text(context, ret));
682 ret = krb5_sname_to_principal(context, ap_get_server_name(r), service,
683 KRB5_NT_SRV_HST, &server);
685 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
686 "krb5_sname_to_principal() failed: %s",
687 krb5_get_err_text(context, ret));
690 /* XXX log_debug: lookig for <server_princ> in keytab */
696 krb5_get_default_realm(context, &realm);
697 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
698 "trying to verify password using key for %s/%s@%s",
699 service, ap_get_server_name(r), realm);
703 if (krb_verify_kdc &&
704 (ret = verify_krb5_init_creds(r, context, &creds, server, keytab))) {
705 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
706 "failed to verify krb5 credentials: %s",
707 krb5_get_err_text(context, ret));
711 ret = krb5_cc_resolve(context, "MEMORY:", &ret_ccache);
713 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
714 "generating new memory ccache failed: %s",
715 krb5_get_err_text(context, ret));
719 ret = krb5_cc_initialize(context, ret_ccache, principal);
721 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
722 "krb5_cc_initialize() failed: %s",
723 krb5_get_err_text(context, ret));
727 ret = krb5_cc_store_cred(context, ret_ccache, &creds);
729 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
730 "krb5_cc_store_cred() failed: %s",
731 krb5_get_err_text(context, ret));
734 *ccache = ret_ccache;
738 krb5_free_cred_contents(context, &creds);
740 krb5_free_principal(context, server);
742 krb5_cc_destroy(context, ret_ccache);
748 krb5_cache_cleanup(void *data)
750 krb5_context context;
752 krb5_error_code problem;
753 char *cache_name = (char *) data;
755 problem = krb5_init_context(&context);
757 /* ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL, "krb5_init_context() failed"); */
758 return HTTP_INTERNAL_SERVER_ERROR;
761 problem = krb5_cc_resolve(context, cache_name, &cache);
763 /* log_error(APLOG_MARK, APLOG_ERR, 0, NULL,
764 "krb5_cc_resolve() failed (%s: %s)",
765 cache_name, krb5_get_err_text(context, problem)); */
766 return HTTP_INTERNAL_SERVER_ERROR;
769 krb5_cc_destroy(context, cache);
770 krb5_free_context(context);
775 create_krb5_ccache(krb5_context kcontext,
777 kerb_auth_config *conf,
778 krb5_principal princ,
783 krb5_error_code problem;
785 krb5_ccache tmp_ccache = NULL;
787 ccname = ap_psprintf(r->pool, "FILE:%s/krb5cc_apache_XXXXXX", P_tmpdir);
788 fd = mkstemp(ccname + strlen("FILE:"));
790 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
791 "mkstemp() failed: %s", strerror(errno));
792 ret = HTTP_INTERNAL_SERVER_ERROR;
797 problem = krb5_cc_resolve(kcontext, ccname, &tmp_ccache);
799 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
800 "krb5_cc_resolve() failed: %s",
801 krb5_get_err_text(kcontext, problem));
802 ret = HTTP_INTERNAL_SERVER_ERROR;
807 problem = krb5_cc_initialize(kcontext, tmp_ccache, princ);
809 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
810 "Cannot initialize krb5 ccache %s: krb5_cc_initialize() failed: %s",
811 ccname, krb5_get_err_text(kcontext, problem));
812 ret = HTTP_INTERNAL_SERVER_ERROR;
816 ap_table_setn(r->subprocess_env, "KRB5CCNAME", ccname);
817 ap_register_cleanup(r->pool, ccname,
818 krb5_cache_cleanup, ap_null_cleanup);
820 *ccache = tmp_ccache;
827 krb5_cc_destroy(kcontext, tmp_ccache);
833 store_krb5_creds(krb5_context kcontext,
835 kerb_auth_config *conf,
836 krb5_ccache delegated_cred)
839 krb5_error_code problem;
840 krb5_principal princ;
844 problem = krb5_cc_get_principal(kcontext, delegated_cred, &princ);
846 snprintf(errstr, sizeof(errstr), "krb5_cc_get_principal() failed: %s",
847 krb5_get_err_text(kcontext, problem));
848 return HTTP_INTERNAL_SERVER_ERROR;
851 ret = create_krb5_ccache(kcontext, r, conf, princ, &ccache);
853 krb5_free_principal(kcontext, princ);
858 problem = krb5_cc_copy_cache(kcontext, delegated_cred, ccache);
860 problem = krb5_cc_copy_creds(kcontext, delegated_cred, ccache);
862 krb5_free_principal(kcontext, princ);
864 snprintf(errstr, sizeof(errstr), "Failed to store credentials: %s",
865 krb5_get_err_text(kcontext, problem));
866 krb5_cc_destroy(kcontext, ccache);
867 return HTTP_INTERNAL_SERVER_ERROR;
870 krb5_cc_close(kcontext, ccache);
876 authenticate_user_krb5pwd(request_rec *r,
877 kerb_auth_config *conf,
878 const char *auth_line)
880 const char *sent_pw = NULL;
881 const char *sent_name = NULL;
882 const char *realms = NULL;
883 const char *realm = NULL;
884 krb5_context kcontext = NULL;
885 krb5_error_code code;
886 krb5_principal client = NULL;
887 krb5_ccache ccache = NULL;
888 krb5_keytab keytab = NULL;
891 int all_principals_unkown;
894 code = krb5_init_context(&kcontext);
896 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
897 "Cannot initialize Kerberos5 context (%d)", code);
898 return HTTP_INTERNAL_SERVER_ERROR;
901 sent_pw = ap_pbase64decode(r->pool, auth_line);
902 sent_name = ap_getword (r->pool, &sent_pw, ':');
904 if (sent_pw == NULL || *sent_pw == '\0') {
905 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
906 "empty passwords are not accepted");
907 ret = HTTP_UNAUTHORIZED;
911 if (conf->krb_5_keytab)
912 krb5_kt_resolve(kcontext, conf->krb_5_keytab, &keytab);
914 p = strchr(sent_name, '@');
917 if (conf->krb_auth_realms && !ap_find_token(r->pool, conf->krb_auth_realms, p)) {
918 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
919 "Specified realm `%s' not allowed by configuration", p);
920 ret = HTTP_UNAUTHORIZED;
925 realms = (p) ? p : conf->krb_auth_realms;
926 all_principals_unkown = 1;
928 name = (char *) sent_name;
929 if (realms && (realm = ap_getword_white(r->pool, &realms)))
930 name = ap_psprintf(r->pool, "%s@%s", sent_name, realm);
933 krb5_free_principal(kcontext, client);
937 code = krb5_parse_name(kcontext, name, &client);
939 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
940 "krb5_parse_name() failed: %s",
941 krb5_get_err_text(kcontext, code));
945 code = verify_krb5_user(r, kcontext, client, sent_pw,
946 conf->krb_service_name,
947 keytab, conf->krb_verify_kdc, &ccache);
948 if (!conf->krb_authoritative && code) {
949 /* if we're not authoritative, we allow authentication to pass on
950 * to another modules if (and only if) the user is not known to us */
951 if (all_principals_unkown && code != KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN)
952 all_principals_unkown = 0;
958 /* ap_getword_white() used above shifts the parameter, so it's not
959 needed to touch the realms variable */
960 } while (realms && *realms);
962 memset((char *)sent_pw, 0, strlen(sent_pw));
965 if (!conf->krb_authoritative && all_principals_unkown == 1 && code == KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN)
968 ret = HTTP_UNAUTHORIZED;
973 code = krb5_unparse_name(kcontext, client, &name);
975 log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "krb5_unparse_name() failed: %s",
976 krb5_get_err_text(kcontext, code));
977 ret = HTTP_UNAUTHORIZED;
980 MK_USER = ap_pstrdup (r->pool, name);
981 MK_AUTH_TYPE = "Basic";
984 if (conf->krb_save_credentials)
985 store_krb5_creds(kcontext, r, conf, ccache);
990 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
991 "kerb_authenticate_user_krb5pwd ret=%d user=%s authtype=%s",
992 ret, (MK_USER)?MK_USER:"(NULL)", (MK_AUTH_TYPE)?MK_AUTH_TYPE:"(NULL)");
994 krb5_free_principal(kcontext, client);
996 krb5_cc_destroy(kcontext, ccache);
998 krb5_kt_close(kcontext, keytab);
999 krb5_free_context(kcontext);
1004 /*********************************************************************
1005 * GSSAPI Authentication
1006 ********************************************************************/
1009 get_gss_error(MK_POOL *p, OM_uint32 err_maj, OM_uint32 err_min, char *prefix)
1011 OM_uint32 maj_stat, min_stat;
1012 OM_uint32 msg_ctx = 0;
1013 gss_buffer_desc status_string;
1016 err_msg = ap_pstrdup(p, prefix);
1018 maj_stat = gss_display_status (&min_stat,
1024 if (GSS_ERROR(maj_stat))
1026 err_msg = ap_pstrcat(p, err_msg, ": ", (char*) status_string.value, NULL);
1027 gss_release_buffer(&min_stat, &status_string);
1029 maj_stat = gss_display_status (&min_stat,
1035 if (!GSS_ERROR(maj_stat)) {
1036 err_msg = ap_pstrcat(p, err_msg,
1037 " (", (char*) status_string.value, ")", NULL);
1038 gss_release_buffer(&min_stat, &status_string);
1040 } while (!GSS_ERROR(maj_stat) && msg_ctx != 0);
1046 store_gss_creds(request_rec *r, kerb_auth_config *conf, char *princ_name,
1047 gss_cred_id_t delegated_cred)
1049 OM_uint32 maj_stat, min_stat;
1050 krb5_principal princ = NULL;
1051 krb5_ccache ccache = NULL;
1052 krb5_error_code problem;
1053 krb5_context context;
1054 int ret = HTTP_INTERNAL_SERVER_ERROR;
1056 problem = krb5_init_context(&context);
1058 log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "Cannot initialize krb5 context");
1059 return HTTP_INTERNAL_SERVER_ERROR;
1062 problem = krb5_parse_name(context, princ_name, &princ);
1064 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1065 "Cannot parse delegated username (%s)", krb5_get_err_text(context, problem));
1069 problem = create_krb5_ccache(context, r, conf, princ, &ccache);
1071 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1072 "Cannot create krb5 ccache (%s)", krb5_get_err_text(context, problem));
1076 maj_stat = gss_krb5_copy_ccache(&min_stat, delegated_cred, ccache);
1077 if (GSS_ERROR(maj_stat)) {
1078 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1079 "Cannot store delegated credential (%s)",
1080 get_gss_error(r->pool, maj_stat, min_stat, "gss_krb5_copy_ccache"));
1084 krb5_cc_close(context, ccache);
1090 krb5_free_principal(context, princ);
1092 krb5_cc_destroy(context, ccache);
1093 krb5_free_context(context);
1098 get_gss_creds(request_rec *r,
1099 kerb_auth_config *conf,
1100 gss_cred_id_t *server_creds)
1102 gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
1103 OM_uint32 major_status, minor_status, minor_status2;
1104 gss_name_t server_name = GSS_C_NO_NAME;
1107 snprintf(buf, sizeof(buf), "%s@%s", conf->krb_service_name,
1108 ap_get_server_name(r));
1111 token.length = strlen(buf) + 1;
1113 major_status = gss_import_name(&minor_status, &token,
1114 GSS_C_NT_HOSTBASED_SERVICE,
1116 memset(&token, 0, sizeof(token));
1117 if (GSS_ERROR(major_status)) {
1118 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1119 "%s", get_gss_error(r->pool, major_status, minor_status,
1120 "gss_import_name() failed"));
1121 return HTTP_INTERNAL_SERVER_ERROR;
1124 major_status = gss_display_name(&minor_status, server_name, &token, NULL);
1125 if (GSS_ERROR(major_status)) {
1126 /* Perhaps we could just ignore this error but it's safer to give up now,
1128 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1129 "%s", get_gss_error(r->pool, major_status, minor_status,
1130 "gss_display_name() failed"));
1131 return HTTP_INTERNAL_SERVER_ERROR;
1134 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "Acquiring creds for %s",
1136 gss_release_buffer(&minor_status, &token);
1138 major_status = gss_acquire_cred(&minor_status, server_name, GSS_C_INDEFINITE,
1139 GSS_C_NO_OID_SET, GSS_C_ACCEPT,
1140 server_creds, NULL, NULL);
1141 gss_release_name(&minor_status2, &server_name);
1142 if (GSS_ERROR(major_status)) {
1143 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1144 "%s", get_gss_error(r->pool, major_status, minor_status,
1145 "gss_acquire_cred() failed"));
1146 return HTTP_INTERNAL_SERVER_ERROR;
1151 * With MIT Kerberos 5 1.3.x the gss_cred_id_t is the same as
1152 * krb5_gss_cred_id_t and krb5_gss_cred_id_rec contains a pointer to
1154 * This allows us to override the replay cache function vector with
1156 * Note that this is a dirty hack to get things working and there may
1157 * well be unknown side-effects.
1160 krb5_gss_cred_id_t gss_creds = (krb5_gss_cred_id_t) *server_creds;
1162 if (gss_creds && gss_creds->rcache && gss_creds->rcache->ops &&
1163 gss_creds->rcache->ops->type &&
1164 memcmp(gss_creds->rcache->ops->type, "dfl", 3) == 0)
1165 /* Override the rcache operations */
1166 gss_creds->rcache->ops = &mod_auth_kerb_rc_ops;
1174 cmp_gss_type(gss_buffer_t token, gss_OID oid)
1179 if (token->length == 0)
1180 return GSS_S_DEFECTIVE_TOKEN;
1184 return GSS_S_DEFECTIVE_TOKEN;
1187 if ((len & 0x7f) > 4)
1188 return GSS_S_DEFECTIVE_TOKEN;
1192 return GSS_S_DEFECTIVE_TOKEN;
1194 if (((OM_uint32) *p++) != oid->length)
1195 return GSS_S_DEFECTIVE_TOKEN;
1197 return memcmp(p, oid->elements, oid->length);
1201 authenticate_user_gss(request_rec *r, kerb_auth_config *conf,
1202 const char *auth_line, char **negotiate_ret_value)
1204 OM_uint32 major_status, minor_status, minor_status2;
1205 gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
1206 gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
1207 const char *auth_param = NULL;
1209 gss_name_t client_name = GSS_C_NO_NAME;
1210 gss_cred_id_t delegated_cred = GSS_C_NO_CREDENTIAL;
1212 (*accept_sec_token)(OM_uint32 *, gss_ctx_id_t *, const gss_cred_id_t,
1213 const gss_buffer_t, const gss_channel_bindings_t,
1214 gss_name_t *, gss_OID *, gss_buffer_t, OM_uint32 *,
1215 OM_uint32 *, gss_cred_id_t *);
1216 gss_OID_desc spnego_oid;
1217 gss_ctx_id_t context = GSS_C_NO_CONTEXT;
1218 gss_cred_id_t server_creds = GSS_C_NO_CREDENTIAL;
1220 *negotiate_ret_value = "\0";
1222 spnego_oid.length = 6;
1223 spnego_oid.elements = (void *)"\x2b\x06\x01\x05\x05\x02";
1225 if (conf->krb_5_keytab) {
1227 /* we don't use the ap_* calls here, since the string passed to putenv()
1228 * will become part of the enviroment and shouldn't be free()ed by apache
1230 ktname = malloc(strlen("KRB5_KTNAME=") + strlen(conf->krb_5_keytab) + 1);
1231 if (ktname == NULL) {
1232 log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "malloc() failed: not enough memory");
1233 ret = HTTP_INTERNAL_SERVER_ERROR;
1236 sprintf(ktname, "KRB5_KTNAME=%s", conf->krb_5_keytab);
1239 /* Seems to be also supported by latest MIT */
1240 gsskrb5_register_acceptor_identity(conf->krb_5_keytab);
1244 ret = get_gss_creds(r, conf, &server_creds);
1248 /* ap_getword() shifts parameter */
1249 auth_param = ap_getword_white(r->pool, &auth_line);
1250 if (auth_param == NULL) {
1251 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1252 "No Authorization parameter in request from client");
1253 ret = HTTP_UNAUTHORIZED;
1257 input_token.length = ap_base64decode_len(auth_param) + 1;
1258 input_token.value = ap_pcalloc(r->connection->pool, input_token.length);
1259 if (input_token.value == NULL) {
1260 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1261 "ap_pcalloc() failed (not enough memory)");
1262 ret = HTTP_INTERNAL_SERVER_ERROR;
1265 input_token.length = ap_base64decode(input_token.value, auth_param);
1267 accept_sec_token = (cmp_gss_type(&input_token, &spnego_oid) == 0) ?
1268 gss_accept_sec_context_spnego : gss_accept_sec_context;
1270 /* pridat: Read client Negotiate data of length XXX, prefix YYY */
1271 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "Verifying client data using %s",
1272 (accept_sec_token == gss_accept_sec_context)
1274 : "SPNEGO GSS-API");
1276 major_status = accept_sec_token(&minor_status,
1280 GSS_C_NO_CHANNEL_BINDINGS,
1287 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1288 "Verification returned code %d", major_status);
1289 if (output_token.length) {
1293 len = ap_base64encode_len(output_token.length) + 1;
1294 token = ap_pcalloc(r->connection->pool, len + 1);
1295 if (token == NULL) {
1296 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1297 "ap_pcalloc() failed (not enough memory)");
1298 ret = HTTP_INTERNAL_SERVER_ERROR;
1299 gss_release_buffer(&minor_status2, &output_token);
1302 ap_base64encode(token, output_token.value, output_token.length);
1304 *negotiate_ret_value = token;
1305 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1306 "GSS-API token of length %d bytes will be sent back",
1307 output_token.length);
1308 gss_release_buffer(&minor_status2, &output_token);
1309 set_kerb_auth_headers(r, conf, 0, 0, *negotiate_ret_value);
1312 if (GSS_ERROR(major_status)) {
1313 if (input_token.length > 7 && memcmp(input_token.value, "NTLMSSP", 7) == 0)
1314 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1315 "Warning: received token seems to be NTLM, which isn't supported by the Kerberos module. Check your IE configuration.");
1317 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1318 "%s", get_gss_error(r->pool, major_status, minor_status,
1319 "gss_accept_sec_context() failed"));
1320 /* Don't offer the Negotiate method again if call to GSS layer failed */
1321 *negotiate_ret_value = NULL;
1322 ret = HTTP_UNAUTHORIZED;
1327 /* This is a _Kerberos_ module so multiple authentication rounds aren't
1328 * supported. If we wanted a generic GSS authentication we would have to do
1329 * some magic with exporting context etc. */
1330 if (major_status & GSS_S_CONTINUE_NEEDED) {
1331 ret = HTTP_UNAUTHORIZED;
1336 major_status = gss_display_name(&minor_status, client_name, &output_token, NULL);
1337 gss_release_name(&minor_status, &client_name);
1338 if (GSS_ERROR(major_status)) {
1339 log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1340 "%s", get_gss_error(r->pool, major_status, minor_status,
1341 "gss_export_name() failed"));
1342 ret = HTTP_INTERNAL_SERVER_ERROR;
1346 MK_AUTH_TYPE = MECH_NEGOTIATE;
1347 MK_USER = ap_pstrdup(r->pool, output_token.value);
1349 if (conf->krb_save_credentials && delegated_cred != GSS_C_NO_CREDENTIAL)
1350 store_gss_creds(r, conf, (char *)output_token.value, delegated_cred);
1352 gss_release_buffer(&minor_status, &output_token);
1358 gss_release_cred(&minor_status, &delegated_cred);
1360 if (output_token.length)
1361 gss_release_buffer(&minor_status, &output_token);
1363 if (client_name != GSS_C_NO_NAME)
1364 gss_release_name(&minor_status, &client_name);
1366 if (server_creds != GSS_C_NO_CREDENTIAL)
1367 gss_release_cred(&minor_status, &server_creds);
1369 if (context != GSS_C_NO_CONTEXT)
1370 gss_delete_sec_context(&minor_status, &context, GSS_C_NO_BUFFER);
1377 already_succeeded(request_rec *r)
1379 if (ap_is_initial_req(r) || MK_AUTH_TYPE == NULL)
1381 if (strcmp(MK_AUTH_TYPE, MECH_NEGOTIATE) ||
1382 (strcmp(MK_AUTH_TYPE, "Basic") && strchr(MK_USER, '@')))
1388 set_kerb_auth_headers(request_rec *r, const kerb_auth_config *conf,
1389 int use_krb4, int use_krb5pwd, char *negotiate_ret_value)
1391 const char *auth_name = NULL;
1393 char *negoauth_param;
1394 const char *header_name =
1395 (r->proxyreq == PROXYREQ_PROXY) ? "Proxy-Authenticate" : "WWW-Authenticate";
1397 /* get the user realm specified in .htaccess */
1398 auth_name = ap_auth_name(r);
1400 /* XXX should the WWW-Authenticate header be cleared first?
1401 * apache in the proxy mode should retain client's authN headers? */
1403 if (negotiate_ret_value != NULL && conf->krb_method_gssapi) {
1404 negoauth_param = (*negotiate_ret_value == '\0') ? MECH_NEGOTIATE :
1405 ap_pstrcat(r->pool, MECH_NEGOTIATE " ", negotiate_ret_value, NULL);
1406 ap_table_add(r->err_headers_out, header_name, negoauth_param);
1408 if ((use_krb5pwd && conf->krb_method_k5pass) || conf->krb_delegate_basic) {
1409 ap_table_add(r->err_headers_out, header_name,
1410 ap_pstrcat(r->pool, "Basic realm=\"", auth_name, "\"", NULL));
1417 ((use_krb4 && conf->krb_method_k4pass) || conf->krb_delegate_basic))
1418 ap_table_add(r->err_headers_out, header_name,
1419 ap_pstrcat(r->pool, "Basic realm=\"", auth_name, "\"", NULL));
1424 kerb_authenticate_user(request_rec *r)
1426 kerb_auth_config *conf =
1427 (kerb_auth_config *) ap_get_module_config(r->per_dir_config,
1429 const char *auth_type = NULL;
1430 const char *auth_line = NULL;
1431 const char *type = NULL;
1432 int use_krb5 = 0, use_krb4 = 0;
1434 static int last_return = HTTP_UNAUTHORIZED;
1435 char *negotiate_ret_value = NULL;
1437 /* get the type specified in .htaccess */
1438 type = ap_auth_type(r);
1440 log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1441 "kerb_authenticate_user entered with user %s and auth_type %s",
1442 (MK_USER)?MK_USER:"(NULL)",type?type:"(NULL)");
1444 if (type && strcasecmp(type, "Kerberos") == 0)
1445 use_krb5 = use_krb4 = 1;
1446 else if(type && strcasecmp(type, "KerberosV5") == 0)
1448 else if(type && strcasecmp(type, "KerberosV4") == 0)
1453 /* get what the user sent us in the HTTP header */
1454 auth_line = MK_TABLE_GET(r->headers_in, (r->proxyreq == PROXYREQ_PROXY)
1455 ? "Proxy-Authorization"
1458 set_kerb_auth_headers(r, conf, use_krb4, use_krb5,
1459 (use_krb5) ? "\0" : NULL);
1460 return HTTP_UNAUTHORIZED;
1462 auth_type = ap_getword_white(r->pool, &auth_line);
1464 /* If we are delegating Basic to other modules, DECLINE the request */
1465 if (conf->krb_delegate_basic &&
1467 !conf->krb_method_k5pass &&
1470 !conf->krb_method_k4pass &&
1472 (strcasecmp(auth_type, "Basic") == 0))
1475 if (already_succeeded(r))
1478 ret = HTTP_UNAUTHORIZED;
1481 if (use_krb5 && conf->krb_method_gssapi &&
1482 strcasecmp(auth_type, MECH_NEGOTIATE) == 0) {
1483 ret = authenticate_user_gss(r, conf, auth_line, &negotiate_ret_value);
1484 } else if (use_krb5 && conf->krb_method_k5pass &&
1485 strcasecmp(auth_type, "Basic") == 0) {
1486 ret = authenticate_user_krb5pwd(r, conf, auth_line);
1491 if (ret == HTTP_UNAUTHORIZED && use_krb4 && conf->krb_method_k4pass &&
1492 strcasecmp(auth_type, "Basic") == 0)
1493 ret = authenticate_user_krb4pwd(r, conf, auth_line);
1496 if (ret == HTTP_UNAUTHORIZED)
1497 set_kerb_auth_headers(r, conf, use_krb4, use_krb5, negotiate_ret_value);
1499 /* XXX log_debug: if ret==OK, log(user XY authenticated) */
1506 /***************************************************************************
1507 Module Setup/Configuration
1508 ***************************************************************************/
1509 #ifndef STANDARD20_MODULE_STUFF
1510 module MODULE_VAR_EXPORT auth_kerb_module = {
1511 STANDARD_MODULE_STUFF,
1512 NULL, /* module initializer */
1513 kerb_dir_create_config, /* per-directory config creator */
1514 NULL, /* per-directory config merger */
1515 NULL, /* per-server config creator */
1516 NULL, /* per-server config merger */
1517 kerb_auth_cmds, /* command table */
1518 NULL, /* [ 9] content handlers */
1519 NULL, /* [ 2] URI-to-filename translation */
1520 kerb_authenticate_user, /* [ 5] check/validate user_id */
1521 NULL, /* [ 6] check user_id is valid *here* */
1522 NULL, /* [ 4] check access by host address */
1523 NULL, /* [ 7] MIME type checker/setter */
1524 NULL, /* [ 8] fixups */
1525 NULL, /* [10] logger */
1526 NULL, /* [ 3] header parser */
1527 NULL, /* process initialization */
1528 NULL, /* process exit/cleanup */
1529 NULL /* [ 1] post read_request handling */
1531 ,NULL, /* EAPI: add_module */
1532 NULL, /* EAPI: remove_module */
1533 NULL, /* EAPI: rewrite_command */
1534 NULL /* EAPI: new_connection */
1539 kerb_init_handler(apr_pool_t *p, apr_pool_t *plog,
1540 apr_pool_t *ptemp, server_rec *s)
1542 ap_add_version_component(p, "mod_auth_kerb/" MODAUTHKERB_VERSION);
1547 kerb_register_hooks(apr_pool_t *p)
1549 ap_hook_post_config(kerb_init_handler, NULL, NULL, APR_HOOK_MIDDLE);
1550 ap_hook_check_user_id(kerb_authenticate_user, NULL, NULL, APR_HOOK_MIDDLE);
1553 module AP_MODULE_DECLARE_DATA auth_kerb_module =
1555 STANDARD20_MODULE_STUFF,
1556 kerb_dir_create_config, /* create per-dir conf structures */
1557 NULL, /* merge per-dir conf structures */
1558 NULL, /* create per-server conf structures */
1559 NULL, /* merge per-server conf structures */
1560 kerb_auth_cmds, /* table of configuration directives */
1561 kerb_register_hooks /* register hooks */