2 * Modifications for Lustre
4 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
6 * Author: Eric Mei <ericm@clusterfs.com>
10 * Adapted in part from MIT Kerberos 5-1.2.1 slave/kprop.c and from
11 * http://docs.sun.com/?p=/doc/816-1331/6m7oo9sms&a=view
13 * Copyright (c) 2002-2004 The Regents of the University of Michigan.
14 * All rights reserved.
16 * Andy Adamson <andros@umich.edu>
17 * J. Bruce Fields <bfields@umich.edu>
18 * Marius Aamodt Eriksen <marius@umich.edu>
19 * Kevin Coffman <kwc@umich.edu>
25 * Copyright 1990,1991 by the Massachusetts Institute of Technology.
26 * All Rights Reserved.
28 * Export of this software from the United States of America may
29 * require a specific license from the United States Government.
30 * It is the responsibility of any person or organization contemplating
31 * export to obtain such a license before exporting.
33 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
34 * distribute this software and its documentation for any purpose and
35 * without fee is hereby granted, provided that the above copyright
36 * notice appear in all copies and that both that copyright notice and
37 * this permission notice appear in supporting documentation, and that
38 * the name of M.I.T. not be used in advertising or publicity pertaining
39 * to distribution of the software without specific, written prior
40 * permission. Furthermore if you modify this software you must label
41 * your software as modified software and not distribute it in such a
42 * fashion that it might be confused with the original M.I.T. software.
43 * M.I.T. makes no representations about the suitability of
44 * this software for any purpose. It is provided "as is" without express
45 * or implied warranty.
49 * Copyright 1994 by OpenVision Technologies, Inc.
51 * Permission to use, copy, modify, distribute, and sell this software
52 * and its documentation for any purpose is hereby granted without fee,
53 * provided that the above copyright notice appears in all copies and
54 * that both that copyright notice and this permission notice appear in
55 * supporting documentation, and that the name of OpenVision not be used
56 * in advertising or publicity pertaining to distribution of the software
57 * without specific, written prior permission. OpenVision makes no
58 * representations about the suitability of this software for any
59 * purpose. It is provided "as is" without express or implied warranty.
61 * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
62 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
63 * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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65 * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
66 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
67 * PERFORMANCE OF THIS SOFTWARE.
72 Copyright (c) 2004 The Regents of the University of Michigan.
75 Redistribution and use in source and binary forms, with or without
76 modification, are permitted provided that the following conditions
79 1. Redistributions of source code must retain the above copyright
80 notice, this list of conditions and the following disclaimer.
81 2. Redistributions in binary form must reproduce the above copyright
82 notice, this list of conditions and the following disclaimer in the
83 documentation and/or other materials provided with the distribution.
84 3. Neither the name of the University nor the names of its
85 contributors may be used to endorse or promote products derived
86 from this software without specific prior written permission.
88 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
89 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
90 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
91 DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
92 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
93 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
94 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
95 BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
96 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
97 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
98 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
106 #include <sys/param.h>
107 //#include <rpc/rpc.h>
108 #include <sys/types.h>
109 #include <sys/stat.h>
110 #include <sys/utsname.h>
111 #include <sys/socket.h>
112 #include <arpa/inet.h>
125 #include <gssapi/gssapi.h>
126 #ifdef USE_PRIVATE_KRB5_FUNCTIONS
127 #include <gssapi/gssapi_krb5.h>
131 #include "lsupport.h"
132 #include "lgss_utils.h"
133 #include "lgss_krb5_utils.h"
135 static void lgss_krb5_mutex_lock(void)
137 if (lgss_mutex_lock(LGSS_MUTEX_KRB5)) {
138 logmsg(LL_ERR, "can't lock process, abort!\n");
143 static void lgss_krb5_mutex_unlock(void)
145 if (lgss_mutex_unlock(LGSS_MUTEX_KRB5)) {
146 logmsg(LL_WARN, "can't unlock process, other processes "
147 "might need to wait long time\n");
153 * - currently we only support "normal" cache types: "FILE" and "MEMORY".
156 #define krb5_err_msg(code) error_message(code)
158 const char *krb5_cc_type_mem = "MEMORY:";
159 const char *krb5_cc_type_file = "FILE:";
160 const char *krb5_cred_root_suffix = "lustre_root";
161 const char *krb5_cred_mds_suffix = "lustre_mds";
162 const char *krb5_cred_oss_suffix = "lustre_oss";
164 char *krb5_this_realm = NULL;
165 char *krb5_keytab_file = "/etc/krb5.keytab";
166 char *krb5_cc_type = "FILE:";
167 char *krb5_cc_dir = "/tmp";
168 char *krb5_cred_prefix = "krb5cc_";
170 struct lgss_krb5_cred {
172 int kc_remove; /* remove cache upon release */
176 int lgss_krb5_set_ccache_name(const char *ccname)
178 #ifdef USE_GSS_KRB5_CCACHE_NAME
179 unsigned int maj_stat, min_stat;
181 maj_stat = gss_krb5_ccache_name(&min_stat, ccname, NULL);
182 if (maj_stat != GSS_S_COMPLETE) {
183 logmsg(LL_ERR, "failed to set ccache name\n");
188 * Set the KRB5CCNAME environment variable to tell the krb5 code
189 * which credentials cache to use. (Instead of using the private
190 * function above for which there is no generic gssapi equivalent)
192 if (setenv("KRB5CCNAME", ccname, 1)) {
193 logmsg(LL_ERR, "set env of krb5 ccname: %s\n",
198 logmsg(LL_DEBUG, "set cc: %s\n", ccname);
203 int lgss_krb5_get_local_realm(void)
205 krb5_context context = NULL;
206 krb5_error_code code;
209 if (krb5_this_realm != NULL)
212 code = krb5_init_context(&context);
214 logmsg(LL_ERR, "init ctx: %s\n", krb5_err_msg(code));
218 code = krb5_get_default_realm(context, &krb5_this_realm);
220 logmsg(LL_ERR, "get default realm: %s\n", krb5_err_msg(code));
224 logmsg(LL_DEBUG, "Local realm: %s\n", krb5_this_realm);
227 krb5_free_context(context);
232 int princ_is_local_realm(krb5_context ctx, krb5_principal princ)
234 return (lgss_krb5_strcasecmp(krb5_princ_realm(ctx, princ),
235 krb5_this_realm) == 0);
239 int svc_princ_verify_host(krb5_context ctx,
240 krb5_principal princ,
244 struct utsname utsbuf;
245 struct hostent *host;
246 const int max_namelen = 512;
247 char namebuf[max_namelen];
250 if (krb5_princ_component(ctx, princ, 1) == NULL) {
251 logmsg(loglevel, "service principal has no host part\n");
256 if (lnet_nid2hostname(self_nid, namebuf, max_namelen)) {
258 "can't resolve hostname from nid %llx\n",
264 if (uname(&utsbuf)) {
265 logmsg(loglevel, "get UTS name: %s\n", strerror(errno));
269 host = gethostbyname(utsbuf.nodename);
271 logmsg(loglevel, "failed to get local hostname\n");
274 h_name = host->h_name;
277 if (lgss_krb5_strcasecmp(krb5_princ_component(ctx, princ, 1),
279 logmsg(loglevel, "service principal: hostname %.*s "
280 "doesn't match localhost %s\n",
281 krb5_princ_component(ctx, princ, 1)->length,
282 krb5_princ_component(ctx, princ, 1)->data,
291 int lkrb5_cc_check_tgt_princ(krb5_context ctx,
293 krb5_principal princ,
297 const char *princ_name;
299 logmsg(LL_DEBUG, "principal: realm %.*s, type %d, size %d, name %.*s\n",
300 krb5_princ_realm(ctx, princ)->length,
301 krb5_princ_realm(ctx, princ)->data,
302 krb5_princ_type(ctx, princ),
303 krb5_princ_size(ctx, princ),
304 krb5_princ_name(ctx, princ)->length,
305 krb5_princ_name(ctx, princ)->data);
308 if (krb5_princ_type(ctx, princ) != KRB5_NT_PRINCIPAL) {
309 logmsg(LL_WARN, "principal type %d is not I want\n",
310 krb5_princ_type(ctx, princ));
314 /* check local realm */
315 if (!princ_is_local_realm(ctx, princ)) {
316 logmsg(LL_WARN, "principal realm %.*s not local: %s\n",
317 krb5_princ_realm(ctx, princ)->length,
318 krb5_princ_realm(ctx, princ)->data,
323 /* check principal name */
325 case LGSS_ROOT_CRED_ROOT:
326 princ_name = LGSS_USR_ROOT_STR;
328 case LGSS_ROOT_CRED_MDT:
329 princ_name = LGSS_SVC_MDS_STR;
331 case LGSS_ROOT_CRED_OST:
332 princ_name = LGSS_SVC_OSS_STR;
338 if (lgss_krb5_strcmp(krb5_princ_name(ctx, princ), princ_name)) {
339 logmsg(LL_WARN, "%.*s: we expect %s instead\n",
340 krb5_princ_name(ctx, princ)->length,
341 krb5_princ_name(ctx, princ)->data,
347 * verify the hostname part of the principal, except we do allow
348 * lustre_root without binding to a host.
350 if (krb5_princ_component(ctx, princ, 1) == NULL) {
351 if (flag != LGSS_ROOT_CRED_ROOT) {
352 logmsg(LL_WARN, "%.*s: missing hostname\n",
353 krb5_princ_name(ctx, princ)->length,
354 krb5_princ_name(ctx, princ)->data);
358 if (svc_princ_verify_host(ctx, princ, self_nid, LL_WARN)) {
359 logmsg(LL_DEBUG, "%.*s: doesn't belong to this node\n",
360 krb5_princ_name(ctx, princ)->length,
361 krb5_princ_name(ctx, princ)->data);
366 logmsg(LL_TRACE, "principal is OK\n");
371 * compose the TGT cc name, according to the root flags.
374 void get_root_tgt_ccname(char *ccname, int size, unsigned int flag)
379 case LGSS_ROOT_CRED_ROOT:
380 suffix = krb5_cred_root_suffix;
382 case LGSS_ROOT_CRED_MDT:
383 suffix = krb5_cred_mds_suffix;
385 case LGSS_ROOT_CRED_OST:
386 suffix = krb5_cred_oss_suffix;
392 snprintf(ccname, size, "%s%s/%s%s_%s",
393 krb5_cc_type, krb5_cc_dir, krb5_cred_prefix,
394 suffix, krb5_this_realm);
398 int lkrb5_check_root_tgt_cc_base(krb5_context ctx,
404 krb5_ccache tgt_ccache;
406 krb5_principal princ;
407 krb5_cc_cursor cursor;
408 krb5_error_code code;
410 int rc = -1, found = 0;
412 /* prepare parsing the cache file */
413 code = krb5_cc_resolve(ctx, ccname, &tgt_ccache);
415 logmsg(LL_ERR, "resolve krb5 cc %s: %s\n",
416 ccname, krb5_err_msg(code));
420 /* checks the principal */
421 code = krb5_cc_get_principal(ctx, tgt_ccache, &princ);
423 logmsg(LL_ERR, "get cc principal: %s\n", krb5_err_msg(code));
427 if (lkrb5_cc_check_tgt_princ(ctx, tgt_ccache, princ, flag, self_nid))
433 code = krb5_cc_start_seq_get(ctx, tgt_ccache, &cursor);
435 logmsg(LL_ERR, "start cc iteration: %s\n", krb5_err_msg(code));
441 krb5_timestamp duration, delta;
443 code = krb5_cc_next_cred(ctx, tgt_ccache, &cursor, &cred);
447 logmsg(LL_DEBUG, "cred: server realm %.*s, type %d, name %.*s; "
448 "time (%d-%d, renew till %d), valid %d\n",
449 krb5_princ_realm(ctx, cred.server)->length,
450 krb5_princ_realm(ctx, cred.server)->data,
451 krb5_princ_type(ctx, cred.server),
452 krb5_princ_name(ctx, cred.server)->length,
453 krb5_princ_name(ctx, cred.server)->data,
454 cred.times.starttime, cred.times.endtime,
455 cred.times.renew_till, cred.times.endtime - now);
458 * we found the princ type is always 0 (KRB5_NT_UNKNOWN), why???
461 /* FIXME how about inter-realm TGT??? FIXME */
462 if (lgss_krb5_strcasecmp(krb5_princ_name(ctx, cred.server),
466 if (lgss_krb5_strcasecmp(krb5_princ_realm(ctx, cred.server),
470 /* check validity of time */
471 delta = 60 * 30; /* half an hour */
472 duration = cred.times.endtime - cred.times.starttime;
473 if (duration / 4 < delta)
474 delta = duration / 4;
476 if (cred.times.starttime <= now &&
477 cred.times.endtime >= now + delta) {
484 logmsg(LL_DEBUG, "doesn't find good TGT cache\n");
488 /* found a good cred, store it into @ccache */
489 logmsg(LL_DEBUG, "found good TGT cache\n");
491 code = krb5_cc_initialize(ctx, ccache, princ);
493 logmsg(LL_ERR, "init private cc: %s\n", krb5_err_msg(code));
497 code = krb5_cc_store_cred(ctx, ccache, &cred);
499 logmsg(LL_ERR, "store private cred: %s\n", krb5_err_msg(code));
503 logmsg(LL_DEBUG, "store private ccache OK\n");
507 krb5_cc_end_seq_get(ctx, tgt_ccache, &cursor);
509 krb5_free_principal(ctx, princ);
511 krb5_cc_close(ctx, tgt_ccache);
517 * find out whether current TGT cache is valid or not
520 int lkrb5_check_root_tgt_cc(krb5_context ctx,
522 unsigned int root_flags,
531 for (i = 0; i < LGSS_ROOT_CRED_NR; i++) {
534 if ((root_flags & flag) == 0)
537 get_root_tgt_ccname(ccname, sizeof(ccname), flag);
538 logmsg(LL_DEBUG, "root krb5 TGT ccname: %s\n", ccname);
540 /* currently we only support type "FILE", firstly make sure
541 * the cache file is there */
542 ccfile = ccname + strlen(krb5_cc_type);
543 if (stat(ccfile, &statbuf)) {
544 logmsg(LL_DEBUG, "krb5 cc %s: %s\n",
545 ccname, strerror(errno));
549 rc = lkrb5_check_root_tgt_cc_base(ctx, ccache, ccname, flag,
555 logmsg(LL_TRACE, "doesn't find a valid tgt cc\n");
560 int lkrb5_get_root_tgt_keytab(krb5_context ctx,
563 krb5_principal princ,
566 krb5_get_init_creds_opt opts;
568 krb5_ccache tgt_ccache;
569 krb5_error_code code;
572 krb5_get_init_creds_opt_init(&opts);
573 krb5_get_init_creds_opt_set_address_list(&opts, NULL);
575 * by default krb5 library obtain ticket with lifetime shorter
576 * than the max value. we can change it here if we want. but
577 * seems not necessary now.
579 krb5_get_init_creds_opt_set_tkt_life(&opts, very-long-time);
584 * obtain TGT and store into global ccache
586 code = krb5_get_init_creds_keytab(ctx, &cred, princ, kt,
589 logmsg(LL_ERR, "failed to get root TGT for "
590 "principal %.*s: %s\n",
591 krb5_princ_name(ctx, princ)->length,
592 krb5_princ_name(ctx, princ)->data,
597 code = krb5_cc_resolve(ctx, ccname, &tgt_ccache);
599 logmsg(LL_ERR, "resolve cc %s: %s\n",
600 ccname, krb5_err_msg(code));
604 code = krb5_cc_initialize(ctx, tgt_ccache, princ);
606 logmsg(LL_ERR, "initialize cc %s: %s\n",
607 ccname, krb5_err_msg(code));
611 code = krb5_cc_store_cred(ctx, tgt_ccache, &cred);
613 logmsg(LL_ERR, "store cred to cc %s: %s\n",
614 ccname, krb5_err_msg(code));
618 logmsg(LL_INFO, "installed TGT of %.*s in cc %s\n",
619 krb5_princ_name(ctx, princ)->length,
620 krb5_princ_name(ctx, princ)->data,
624 * now store the cred into my own cc too
626 code = krb5_cc_initialize(ctx, ccache, princ);
628 logmsg(LL_ERR, "init mem cc: %s\n", krb5_err_msg(code));
632 code = krb5_cc_store_cred(ctx, ccache, &cred);
634 logmsg(LL_ERR, "store mm cred: %s\n", krb5_err_msg(code));
638 logmsg(LL_DEBUG, "stored TGT into mem cc OK\n");
641 krb5_cc_close(ctx, tgt_ccache);
643 krb5_free_cred_contents(ctx, &cred);
648 * obtain a new root TGT
651 int lkrb5_refresh_root_tgt_cc(krb5_context ctx,
653 unsigned int root_flags,
657 krb5_keytab_entry kte;
658 krb5_kt_cursor cursor;
659 krb5_principal princ = NULL;
660 krb5_error_code code;
662 unsigned int flag = 0;
665 /* prepare parsing the keytab file */
666 code = krb5_kt_resolve(ctx, krb5_keytab_file, &kt);
668 logmsg(LL_ERR, "resolve keytab %s: %s\n",
669 krb5_keytab_file, krb5_err_msg(code));
673 code = krb5_kt_start_seq_get(ctx, kt, &cursor);
675 logmsg(LL_ERR, "start kt iteration: %s\n", krb5_err_msg(code));
679 /* iterate keytab to find proper an entry */
681 krb5_data *princname;
683 code = krb5_kt_next_entry(ctx, kt, &kte, &cursor);
687 logmsg(LL_TRACE, "kt entry: realm %.*s, type %d, "
688 "size %d, name %.*s\n",
689 krb5_princ_realm(ctx, kte.principal)->length,
690 krb5_princ_realm(ctx, kte.principal)->data,
691 krb5_princ_type(ctx, kte.principal),
692 krb5_princ_size(ctx, kte.principal),
693 krb5_princ_name(ctx, kte.principal)->length,
694 krb5_princ_name(ctx, kte.principal)->data);
696 if (!princ_is_local_realm(ctx, kte.principal))
699 princname = krb5_princ_name(ctx, kte.principal);
701 if ((root_flags & LGSS_ROOT_CRED_ROOT) != 0 &&
702 lgss_krb5_strcmp(princname, LGSS_USR_ROOT_STR) == 0) {
703 flag = LGSS_ROOT_CRED_ROOT;
704 } else if ((root_flags & LGSS_ROOT_CRED_MDT) != 0 &&
705 lgss_krb5_strcmp(princname, LGSS_SVC_MDS_STR) == 0) {
706 flag = LGSS_ROOT_CRED_MDT;
707 } else if ((root_flags & LGSS_ROOT_CRED_OST) != 0 &&
708 lgss_krb5_strcmp(princname, LGSS_SVC_OSS_STR) == 0) {
709 flag = LGSS_ROOT_CRED_OST;
711 logmsg(LL_TRACE, "not what we want, skip\n");
715 if (krb5_princ_component(ctx, kte.principal, 1) == NULL) {
716 if (flag != LGSS_ROOT_CRED_ROOT) {
717 logmsg(LL_TRACE, "no hostname, skip\n");
721 if (svc_princ_verify_host(ctx, kte.principal, self_nid,
723 logmsg(LL_TRACE, "doesn't belong to this "
729 code = krb5_copy_principal(ctx, kte.principal, &princ);
731 logmsg(LL_ERR, "copy princ: %s\n", krb5_err_msg(code));
735 lassert(princ != NULL);
739 krb5_kt_end_seq_get(ctx, kt, &cursor);
742 logmsg(LL_ERR, "can't find proper keytab entry\n");
746 /* obtain root TGT */
747 get_root_tgt_ccname(ccname, sizeof(ccname), flag);
748 rc = lkrb5_get_root_tgt_keytab(ctx, ccache, kt, princ, ccname);
750 krb5_free_principal(ctx, princ);
752 krb5_kt_close(ctx, kt);
757 int lkrb5_prepare_root_cred(struct lgss_cred *cred)
761 krb5_error_code code;
762 struct lgss_krb5_cred *kcred;
765 lassert(krb5_this_realm != NULL);
767 kcred = (struct lgss_krb5_cred *) cred->lc_mech_cred;
769 /* compose the memory cc name, since the only user is myself,
770 * the name could be fixed */
771 snprintf(kcred->kc_ccname, sizeof(kcred->kc_ccname),
772 "%s/self", krb5_cc_type_mem);
773 logmsg(LL_TRACE, "private cc: %s\n", kcred->kc_ccname);
775 code = krb5_init_context(&ctx);
777 logmsg(LL_ERR, "initialize krb5 context: %s\n",
782 code = krb5_cc_resolve(ctx, kcred->kc_ccname, &ccache);
784 logmsg(LL_ERR, "resolve krb5 cc %s: %s\n",
785 kcred->kc_ccname, krb5_err_msg(code));
790 * search and/or obtain root TGT credential.
791 * it touched global (on-disk) tgt cache, do it inside mutex locking
793 lgss_krb5_mutex_lock();
795 rc = lkrb5_check_root_tgt_cc(ctx, ccache, cred->lc_root_flags,
798 rc = lkrb5_refresh_root_tgt_cc(ctx, ccache,
803 rc = lgss_krb5_set_ccache_name(kcred->kc_ccname);
805 lgss_krb5_mutex_unlock();
807 krb5_cc_close(ctx, ccache);
809 krb5_free_context(ctx);
811 logmsg(LL_DEBUG, "prepare root credentail %s\n", rc ? "failed" : "OK");
816 int lkrb5_prepare_user_cred(struct lgss_cred *cred)
818 struct lgss_krb5_cred *kcred;
821 lassert(krb5_this_realm == NULL);
823 kcred = (struct lgss_krb5_cred *) cred->lc_mech_cred;
826 * here we just specified a fix ccname, instead of searching
827 * entire cc dir. is this OK??
829 snprintf(kcred->kc_ccname, sizeof(kcred->kc_ccname),
831 krb5_cc_type, krb5_cc_dir, krb5_cred_prefix, cred->lc_uid);
832 logmsg(LL_DEBUG, "using krb5 cache name: %s\n", kcred->kc_ccname);
834 rc = lgss_krb5_set_ccache_name(kcred->kc_ccname);
836 logmsg(LL_ERR, "can't set krb5 ccache name: %s\n",
843 int lgss_krb5_prepare_cred(struct lgss_cred *cred)
845 struct lgss_krb5_cred *kcred;
848 kcred = malloc(sizeof(*kcred));
850 logmsg(LL_ERR, "can't allocate krb5 cred\n");
854 kcred->kc_ccname[0] = '\0';
855 kcred->kc_remove = 0;
856 cred->lc_mech_cred = kcred;
858 if (cred->lc_root_flags != 0) {
859 if (lgss_krb5_get_local_realm())
862 rc = lkrb5_prepare_root_cred(cred);
864 rc = lkrb5_prepare_user_cred(cred);
871 void lgss_krb5_release_cred(struct lgss_cred *cred)
873 struct lgss_krb5_cred *kcred;
875 kcred = (struct lgss_krb5_cred *) cred->lc_mech_cred;
878 cred->lc_mech_cred = NULL;
881 struct lgss_mech_type lgss_mech_krb5 =
884 .lmt_mech_n = LGSS_MECH_KRB5,
885 .lmt_prepare_cred = lgss_krb5_prepare_cred,
886 .lmt_release_cred = lgss_krb5_release_cred,