2 * Adapted in part from MIT Kerberos 5-1.2.1 slave/kprop.c and from
3 * http://docs.sun.com/?p=/doc/816-1331/6m7oo9sms&a=view
5 * Copyright (c) 2002-2004 The Regents of the University of Michigan.
8 * Andy Adamson <andros@umich.edu>
9 * J. Bruce Fields <bfields@umich.edu>
10 * Marius Aamodt Eriksen <marius@umich.edu>
11 * Kevin Coffman <kwc@umich.edu>
17 * Copyright 1990,1991 by the Massachusetts Institute of Technology.
18 * All Rights Reserved.
20 * Export of this software from the United States of America may
21 * require a specific license from the United States Government.
22 * It is the responsibility of any person or organization contemplating
23 * export to obtain such a license before exporting.
25 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
26 * distribute this software and its documentation for any purpose and
27 * without fee is hereby granted, provided that the above copyright
28 * notice appear in all copies and that both that copyright notice and
29 * this permission notice appear in supporting documentation, and that
30 * the name of M.I.T. not be used in advertising or publicity pertaining
31 * to distribution of the software without specific, written prior
32 * permission. Furthermore if you modify this software you must label
33 * your software as modified software and not distribute it in such a
34 * fashion that it might be confused with the original M.I.T. software.
35 * M.I.T. makes no representations about the suitability of
36 * this software for any purpose. It is provided "as is" without express
37 * or implied warranty.
41 * Copyright 1994 by OpenVision Technologies, Inc.
43 * Permission to use, copy, modify, distribute, and sell this software
44 * and its documentation for any purpose is hereby granted without fee,
45 * provided that the above copyright notice appears in all copies and
46 * that both that copyright notice and this permission notice appear in
47 * supporting documentation, and that the name of OpenVision not be used
48 * in advertising or publicity pertaining to distribution of the software
49 * without specific, written prior permission. OpenVision makes no
50 * representations about the suitability of this software for any
51 * purpose. It is provided "as is" without express or implied warranty.
53 * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
54 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
55 * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
56 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
57 * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
58 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
59 * PERFORMANCE OF THIS SOFTWARE.
64 Copyright (c) 2004 The Regents of the University of Michigan.
67 Redistribution and use in source and binary forms, with or without
68 modification, are permitted provided that the following conditions
71 1. Redistributions of source code must retain the above copyright
72 notice, this list of conditions and the following disclaimer.
73 2. Redistributions in binary form must reproduce the above copyright
74 notice, this list of conditions and the following disclaimer in the
75 documentation and/or other materials provided with the distribution.
76 3. Neither the name of the University nor the names of its
77 contributors may be used to endorse or promote products derived
78 from this software without specific prior written permission.
80 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
81 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
82 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
83 DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
84 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
85 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
86 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
87 BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
88 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
89 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
90 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
98 #include <sys/param.h>
100 #include <sys/stat.h>
101 #include <sys/socket.h>
102 #include <arpa/inet.h>
113 #include <gssapi/gssapi.h>
114 #ifdef USE_PRIVATE_KRB5_FUNCTIONS
115 #include <gssapi/gssapi_krb5.h>
118 #include <rpc/auth_gss.h>
121 #include "err_util.h"
122 #include "gss_util.h"
123 #include "gss_oids.h"
124 #include "krb5_util.h"
126 /* Global list of principals/cache file names for machine credentials */
127 struct gssd_k5_kt_princ *gssd_k5_kt_princ_list = NULL;
129 /*==========================*/
130 /*=== Internal routines ===*/
131 /*==========================*/
133 static int select_krb5_ccache(const struct dirent *d);
134 static int gssd_find_existing_krb5_ccache(uid_t uid, struct dirent **d);
135 static int gssd_get_single_krb5_cred(krb5_context context,
136 krb5_keytab kt, struct gssd_k5_kt_princ *ple);
140 * Called from the scandir function to weed out potential krb5
141 * credentials cache files
144 * 0 => don't select this one
145 * 1 => select this one
148 select_krb5_ccache(const struct dirent *d)
151 * Note: We used to check d->d_type for DT_REG here,
152 * but apparenlty reiser4 always has DT_UNKNOWN.
153 * Check for IS_REG after stat() call instead.
155 if (strstr(d->d_name, GSSD_DEFAULT_CRED_PREFIX))
162 * Look in the ccachedir for files that look like they
163 * are Kerberos Credential Cache files for a given UID. Return
164 * non-zero and the dirent pointer for the entry most likely to be
165 * what we want. Otherwise, return zero and no dirent pointer.
166 * The caller is responsible for freeing the dirent if one is returned.
169 * 0 => could not find an existing entry
170 * 1 => found an existing entry
173 gssd_find_existing_krb5_ccache(uid_t uid, struct dirent **d)
175 struct dirent **namelist;
179 struct dirent *best_match_dir = NULL;
180 struct stat best_match_stat, tmp_stat;
182 memset(&best_match_stat, 0, sizeof(best_match_stat));
184 n = scandir(ccachedir, &namelist, select_krb5_ccache, 0);
186 perror("scandir looking for krb5 credentials caches");
190 for (i = 0; i < n; i++) {
191 printerr(3, "CC file '%s' being considered\n",
192 namelist[i]->d_name);
193 snprintf(statname, sizeof(statname),
194 "%s/%s", ccachedir, namelist[i]->d_name);
195 if (lstat(statname, &tmp_stat)) {
196 printerr(0, "Error doing stat on file '%s'\n",
201 /* Only pick caches owned by the user (uid) */
202 if (tmp_stat.st_uid != uid) {
203 printerr(3, "'%s' owned by %u, not %u\n",
204 statname, tmp_stat.st_uid, uid);
208 if (!S_ISREG(tmp_stat.st_mode)) {
209 printerr(3, "'%s' is not a regular file\n",
214 printerr(3, "CC file '%s' matches owner check and has "
216 namelist[i]->d_name, tmp_stat.st_mtime);
218 * if more than one match is found, return the most
219 * recent (the one with the latest mtime), and
220 * don't free the dirent
223 best_match_dir = namelist[i];
224 best_match_stat = tmp_stat;
229 * If the current match has an mtime later
230 * than the one we are looking at, then use
231 * the current match. Otherwise, we still
232 * have the best match.
234 if (tmp_stat.st_mtime >
235 best_match_stat.st_mtime) {
236 free(best_match_dir);
237 best_match_dir = namelist[i];
238 best_match_stat = tmp_stat;
243 printerr(3, "CC file '%s' is our "
244 "current best match "
245 "with mtime of %u\n",
246 best_match_dir->d_name,
247 best_match_stat.st_mtime);
260 #ifdef HAVE_SET_ALLOWABLE_ENCTYPES
262 * this routine obtains a credentials handle via gss_acquire_cred()
263 * then calls gss_krb5_set_allowable_enctypes() to limit the encryption
266 * XXX Should call some function to determine the enctypes supported
267 * by the kernel. (Only need to do that once!)
271 * -1 => there was an error
275 limit_krb5_enctypes(struct rpc_gss_sec *sec, uid_t uid)
277 u_int maj_stat, min_stat;
279 gss_OID_set_desc desired_mechs;
280 krb5_enctype enctypes[] = { ENCTYPE_DES_CBC_CRC };
281 int num_enctypes = sizeof(enctypes) / sizeof(enctypes[0]);
283 /* We only care about getting a krb5 cred */
284 desired_mechs.count = 1;
285 desired_mechs.elements = &krb5oid;
287 maj_stat = gss_acquire_cred(&min_stat, NULL, 0,
288 &desired_mechs, GSS_C_INITIATE,
291 if (maj_stat != GSS_S_COMPLETE) {
292 pgsserr("gss_acquire_cred",
293 maj_stat, min_stat, &krb5oid);
297 maj_stat = gss_set_allowable_enctypes(&min_stat, credh, &krb5oid,
298 num_enctypes, &enctypes);
299 if (maj_stat != GSS_S_COMPLETE) {
300 pgsserr("gss_set_allowable_enctypes",
301 maj_stat, min_stat, &krb5oid);
302 gss_release_cred(&min_stat, &credh);
309 #endif /* HAVE_SET_ALLOWABLE_ENCTYPES */
312 * Obtain credentials via a key in the keytab given
313 * a keytab handle and a gssd_k5_kt_princ structure.
314 * Checks to see if current credentials are expired,
315 * if not, uses the keytab to obtain new credentials.
318 * 0 => success (or credentials have not expired)
322 gssd_get_single_krb5_cred(krb5_context context,
324 struct gssd_k5_kt_princ *ple)
326 krb5_get_init_creds_opt options;
328 krb5_ccache ccache = NULL;
329 char kt_name[BUFSIZ];
330 char cc_name[BUFSIZ];
332 time_t now = time(0);
336 memset(&my_creds, 0, sizeof(my_creds));
338 if (ple->ccname && ple->endtime > now) {
339 printerr(2, "INFO: Credentials in CC '%s' are good until %d\n",
340 ple->ccname, ple->endtime);
345 if ((code = krb5_kt_get_name(context, kt, kt_name, BUFSIZ))) {
346 printerr(0, "ERROR: Unable to get keytab name in "
347 "gssd_get_single_krb5_cred\n");
351 if ((krb5_unparse_name(context, ple->princ, &pname)))
354 krb5_get_init_creds_opt_init(&options);
355 krb5_get_init_creds_opt_set_address_list(&options, NULL);
357 #ifdef TEST_SHORT_LIFETIME
358 /* set a short lifetime (for debugging only!) */
359 printerr(0, "WARNING: Using (debug) short machine cred lifetime!\n");
360 krb5_get_init_creds_opt_set_tkt_life(&options, 5*60);
362 if ((code = krb5_get_init_creds_keytab(context, &my_creds, ple->princ,
363 kt, 0, NULL, &options))) {
364 printerr(0, "WARNING: %s while getting initial ticket for "
365 "principal '%s' using keytab '%s'\n",
366 gssd_k5_err_msg(context, code),
367 pname ? pname : "<unparsable>", kt_name);
372 * Initialize cache file which we're going to be using
376 cache_type = "MEMORY";
379 snprintf(cc_name, sizeof(cc_name), "%s:%s/%s%s_%s",
381 GSSD_DEFAULT_CRED_DIR, GSSD_DEFAULT_CRED_PREFIX,
382 GSSD_DEFAULT_MACHINE_CRED_SUFFIX, ple->realm);
383 ple->endtime = my_creds.times.endtime;
384 if (ple->ccname != NULL)
386 ple->ccname = strdup(cc_name);
387 if (ple->ccname == NULL) {
388 printerr(0, "ERROR: no storage to duplicate credentials "
389 "cache name '%s'\n", cc_name);
393 if ((code = krb5_cc_resolve(context, cc_name, &ccache))) {
394 printerr(0, "ERROR: %s while opening credential cache '%s'\n",
395 gssd_k5_err_msg(context, code), cc_name);
398 if ((code = krb5_cc_initialize(context, ccache, ple->princ))) {
399 printerr(0, "ERROR: %s while initializing credential "
400 "cache '%s'\n", gssd_k5_err_msg(context, code),
404 if ((code = krb5_cc_store_cred(context, ccache, &my_creds))) {
405 printerr(0, "ERROR: %s while storing credentials in '%s'\n",
406 gssd_k5_err_msg(context, code), cc_name);
411 printerr(2, "Successfully obtained machine credentials for "
412 "principal '%s' stored in ccache '%s'\n", pname, cc_name);
415 k5_free_unparsed_name(context, pname);
417 krb5_cc_close(context, ccache);
418 krb5_free_cred_contents(context, &my_creds);
423 * Depending on the version of Kerberos, we either need to use
424 * a private function, or simply set the environment variable.
427 gssd_set_krb5_ccache_name(char *ccname)
429 #ifdef USE_GSS_KRB5_CCACHE_NAME
430 u_int maj_stat, min_stat;
432 printerr(2, "using gss_krb5_ccache_name to select krb5 ccache %s\n",
434 maj_stat = gss_krb5_ccache_name(&min_stat, ccname, NULL);
435 if (maj_stat != GSS_S_COMPLETE) {
436 printerr(0, "WARNING: gss_krb5_ccache_name with "
437 "name '%s' failed (%s)\n",
438 ccname, error_message(min_stat));
442 * Set the KRB5CCNAME environment variable to tell the krb5 code
443 * which credentials cache to use. (Instead of using the private
444 * function above for which there is no generic gssapi
447 printerr(2, "using environment variable to select krb5 ccache %s\n",
449 setenv("KRB5CCNAME", ccname, 1);
454 * Given a principal, find a matching ple structure
456 static struct gssd_k5_kt_princ *
457 find_ple_by_princ(krb5_context context, krb5_principal princ)
459 struct gssd_k5_kt_princ *ple;
461 for (ple = gssd_k5_kt_princ_list; ple != NULL; ple = ple->next) {
462 if (krb5_principal_compare(context, ple->princ, princ))
470 * Create, initialize, and add a new ple structure to the global list
472 static struct gssd_k5_kt_princ *
473 new_ple(krb5_context context, krb5_principal princ)
475 struct gssd_k5_kt_princ *ple = NULL, *p;
476 krb5_error_code code;
478 int is_default_realm = 0;
480 ple = malloc(sizeof(struct gssd_k5_kt_princ));
483 memset(ple, 0, sizeof(*ple));
486 ple->realm = strndup(princ->realm.data,
487 princ->realm.length);
489 ple->realm = strdup(princ->realm);
491 if (ple->realm == NULL)
493 code = krb5_copy_principal(context, princ, &ple->princ);
498 * Add new entry onto the list (if this is the default
499 * realm, always add to the front of the list)
502 code = krb5_get_default_realm(context, &default_realm);
504 if (strcmp(ple->realm, default_realm) == 0)
505 is_default_realm = 1;
506 k5_free_default_realm(context, default_realm);
509 if (is_default_realm) {
510 ple->next = gssd_k5_kt_princ_list;
511 gssd_k5_kt_princ_list = ple;
513 p = gssd_k5_kt_princ_list;
514 while (p != NULL && p->next != NULL)
517 gssd_k5_kt_princ_list = ple;
533 * Given a principal, find an existing ple structure, or create one
535 static struct gssd_k5_kt_princ *
536 get_ple_by_princ(krb5_context context, krb5_principal princ)
538 struct gssd_k5_kt_princ *ple;
540 /* Need to serialize list if we ever become multi-threaded! */
542 ple = find_ple_by_princ(context, princ);
544 ple = new_ple(context, princ);
551 * Given a (possibly unqualified) hostname,
552 * return the fully qualified (lower-case!) hostname
555 get_full_hostname(const char *inhost, char *outhost, int outhostlen)
557 struct addrinfo *addrs = NULL;
558 struct addrinfo hints;
562 memset(&hints, 0, sizeof(hints));
563 hints.ai_socktype = SOCK_STREAM;
564 hints.ai_family = PF_UNSPEC;
565 hints.ai_flags = AI_CANONNAME;
567 /* Get full target hostname */
568 retval = getaddrinfo(inhost, NULL, &hints, &addrs);
570 printerr(0, "%s while getting full hostname for '%s'\n",
571 gai_strerror(retval), inhost);
574 strncpy(outhost, addrs->ai_canonname, outhostlen);
576 for (c = outhost; *c != '\0'; c++)
579 printerr(3, "Full hostname for '%s' is '%s'\n", inhost, outhost);
586 * If principal matches the given realm and service name,
587 * and has *any* instance (hostname), return 1.
588 * Otherwise return 0, indicating no match.
591 realm_and_service_match(krb5_context context, krb5_principal p,
592 const char *realm, const char *service)
595 /* Must have two components */
598 if ((strlen(realm) == p->realm.length)
599 && (strncmp(realm, p->realm.data, p->realm.length) == 0)
600 && (strlen(service) == p->data[0].length)
601 && (strncmp(service, p->data[0].data, p->data[0].length) == 0))
604 const char *name, *inst;
606 if (p->name.name_string.len != 2)
608 name = krb5_principal_get_comp_string(context, p, 0);
609 inst = krb5_principal_get_comp_string(context, p, 1);
610 if (name == NULL || inst == NULL)
612 if ((strcmp(realm, p->realm) == 0)
613 && (strcmp(service, name) == 0))
620 * Search the given keytab file looking for an entry with the given
621 * service name and realm, ignoring hostname (instance).
625 * non-zero => An error occurred
627 * If a keytab entry is found, "found" is set to one, and the keytab
628 * entry is returned in "kte". Otherwise, "found" is zero, and the
629 * value of "kte" is unpredictable.
632 gssd_search_krb5_keytab(krb5_context context, krb5_keytab kt,
633 const char *realm, const char *service,
634 int *found, krb5_keytab_entry *kte)
636 krb5_kt_cursor cursor;
637 krb5_error_code code;
638 struct gssd_k5_kt_princ *ple;
640 char kt_name[BUFSIZ];
650 * Look through each entry in the keytab file and determine
651 * if we might want to use it as machine credentials. If so,
652 * save info in the global principal list (gssd_k5_kt_princ_list).
654 if ((code = krb5_kt_get_name(context, kt, kt_name, BUFSIZ))) {
655 printerr(0, "ERROR: %s attempting to get keytab name\n",
656 gssd_k5_err_msg(context, code));
660 if ((code = krb5_kt_start_seq_get(context, kt, &cursor))) {
661 printerr(0, "ERROR: %s while beginning keytab scan "
663 gssd_k5_err_msg(context, code), kt_name);
668 while ((code = krb5_kt_next_entry(context, kt, kte, &cursor)) == 0) {
669 if ((code = krb5_unparse_name(context, kte->principal,
671 printerr(0, "WARNING: Skipping keytab entry because "
672 "we failed to unparse principal name: %s\n",
673 gssd_k5_err_msg(context, code));
674 k5_free_kt_entry(context, kte);
677 printerr(4, "Processing keytab entry for principal '%s'\n",
679 /* Use the first matching keytab entry found */
680 if ((realm_and_service_match(context, kte->principal, realm,
682 printerr(4, "We WILL use this entry (%s)\n", pname);
683 ple = get_ple_by_princ(context, kte->principal);
685 * Return, don't free, keytab entry if
686 * we were successful!
690 k5_free_kt_entry(context, kte);
695 k5_free_unparsed_name(context, pname);
699 printerr(4, "We will NOT use this entry (%s)\n",
702 k5_free_unparsed_name(context, pname);
703 k5_free_kt_entry(context, kte);
706 if ((code = krb5_kt_end_seq_get(context, kt, &cursor))) {
707 printerr(0, "WARNING: %s while ending keytab scan for "
709 gssd_k5_err_msg(context, code), kt_name);
718 * Find a keytab entry to use for a given target hostname.
719 * Tries to find the most appropriate keytab to use given the
720 * name of the host we are trying to connect with.
723 find_keytab_entry(krb5_context context, krb5_keytab kt, const char *hostname,
724 krb5_keytab_entry *kte)
726 krb5_error_code code;
727 const char *svcnames[] = { "root", "nfs", "host", NULL };
728 char **realmnames = NULL;
729 char myhostname[NI_MAXHOST], targethostname[NI_MAXHOST];
731 char *default_realm = NULL;
733 int tried_all = 0, tried_default = 0;
734 krb5_principal princ;
737 /* Get full target hostname */
738 retval = get_full_hostname(hostname, targethostname,
739 sizeof(targethostname));
743 /* Get full local hostname */
744 retval = gethostname(myhostname, sizeof(myhostname));
746 printerr(1, "%s while getting local hostname\n",
747 gssd_k5_err_msg(context, retval));
750 retval = get_full_hostname(myhostname, myhostname, sizeof(myhostname));
754 code = krb5_get_default_realm(context, &default_realm);
757 printerr(1, "%s while getting default realm name\n",
758 gssd_k5_err_msg(context, code));
763 * Get the realm name(s) for the target hostname.
764 * In reality, this function currently only returns a
765 * single realm, but we code with the assumption that
766 * someday it may actually return a list.
768 code = krb5_get_host_realm(context, targethostname, &realmnames);
770 printerr(0, "ERROR: %s while getting realm(s) for host '%s'\n",
771 gssd_k5_err_msg(context, code), targethostname);
777 * Try the "appropriate" realm first, and if nothing found for that
778 * realm, try the default realm (if it hasn't already been tried).
781 realm = realmnames[i];
786 realm = default_realm;
788 if (tried_all && tried_default)
790 if (strcmp(realm, default_realm) == 0)
792 for (j = 0; svcnames[j] != NULL; j++) {
793 code = krb5_build_principal_ext(context, &princ,
802 printerr(1, "%s while building principal for "
804 gssd_k5_err_msg(context, code),
805 svcnames[j], myhostname, realm);
808 code = krb5_kt_get_entry(context, kt, princ, 0, 0, kte);
809 krb5_free_principal(context, princ);
811 printerr(3, "%s while getting keytab entry for "
813 gssd_k5_err_msg(context, code),
814 svcnames[j], myhostname, realm);
816 printerr(3, "Success getting keytab entry for "
818 svcnames[j], myhostname, realm);
825 * Nothing found with our hostname instance, now look for
826 * names with any instance (they must have an instance)
828 for (j = 0; svcnames[j] != NULL; j++) {
830 code = gssd_search_krb5_keytab(context, kt, realm,
831 svcnames[j], &found, kte);
832 if (!code && found) {
833 printerr(3, "Success getting keytab entry for "
834 "%s/*@%s\n", svcnames[j], realm);
841 realm = realmnames[i];
846 k5_free_default_realm(context, default_realm);
848 krb5_free_host_realm(context, realmnames);
852 /*==========================*/
853 /*=== External routines ===*/
854 /*==========================*/
857 * Attempt to find the best match for a credentials cache file
858 * given only a UID. We really need more information, but we
859 * do the best we can.
865 gssd_setup_krb5_user_gss_ccache(uid_t uid, char *servername)
867 char buf[MAX_NETOBJ_SZ];
870 printerr(2, "getting credentials for client with uid %u for "
871 "server %s\n", uid, servername);
872 memset(buf, 0, sizeof(buf));
873 if (gssd_find_existing_krb5_ccache(uid, &d)) {
874 snprintf(buf, sizeof(buf), "FILE:%s/%s",
875 ccachedir, d->d_name);
879 snprintf(buf, sizeof(buf), "FILE:%s/%s%u",
880 ccachedir, GSSD_DEFAULT_CRED_PREFIX, uid);
881 printerr(2, "using %s as credentials cache for client with "
882 "uid %u for server %s\n", buf, uid, servername);
883 gssd_set_krb5_ccache_name(buf);
887 * Let the gss code know where to find the machine credentials ccache.
893 gssd_setup_krb5_machine_gss_ccache(char *ccname)
895 printerr(2, "using %s as credentials cache for machine creds\n",
897 gssd_set_krb5_ccache_name(ccname);
901 * Return an array of pointers to names of credential cache files
902 * which can be used to try to create gss contexts with a server.
905 * 0 => list is attached
909 gssd_get_krb5_machine_cred_list(char ***list)
913 int listsize = listinc;
916 struct gssd_k5_kt_princ *ple;
920 *list = (char **) NULL;
922 if ((l = (char **) malloc(listsize * sizeof(char *))) == NULL) {
927 /* Need to serialize list if we ever become multi-threaded! */
929 for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
931 /* Make sure cred is up-to-date before returning it */
932 retval = gssd_refresh_krb5_machine_credential(NULL, ple);
935 if (i + 1 > listsize) {
938 realloc(l, listsize * sizeof(char *));
944 if ((l[i++] = strdup(ple->ccname)) == NULL) {
961 * Frees the list of names returned in get_krb5_machine_cred_list()
964 gssd_free_krb5_machine_cred_list(char **list)
970 for (n = list; n && *n; n++) {
977 * Called upon exit. Destroys machine credentials.
980 gssd_destroy_krb5_machine_creds(void)
982 krb5_context context;
983 krb5_error_code code = 0;
985 struct gssd_k5_kt_princ *ple;
987 code = krb5_init_context(&context);
989 printerr(0, "ERROR: %s while initializing krb5\n",
990 gssd_k5_err_msg(NULL, code));
994 for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
997 if ((code = krb5_cc_resolve(context, ple->ccname, &ccache))) {
998 printerr(0, "WARNING: %s while resolving credential "
999 "cache '%s' for destruction\n",
1000 gssd_k5_err_msg(context, code), ple->ccname);
1004 if ((code = krb5_cc_destroy(context, ccache))) {
1005 printerr(0, "WARNING: %s while destroying credential "
1007 gssd_k5_err_msg(context, code), ple->ccname);
1011 krb5_free_context(context);
1015 * Obtain (or refresh if necessary) Kerberos machine credentials
1018 gssd_refresh_krb5_machine_credential(char *hostname,
1019 struct gssd_k5_kt_princ *ple)
1021 krb5_error_code code = 0;
1022 krb5_context context;
1023 krb5_keytab kt = NULL;;
1026 if (hostname == NULL && ple == NULL)
1029 code = krb5_init_context(&context);
1031 printerr(0, "ERROR: %s: %s while initializing krb5 context\n",
1032 __FUNCTION__, gssd_k5_err_msg(NULL, code));
1037 if ((code = krb5_kt_resolve(context, keytabfile, &kt))) {
1038 printerr(0, "ERROR: %s: %s while resolving keytab '%s'\n",
1039 __FUNCTION__, gssd_k5_err_msg(context, code),
1045 krb5_keytab_entry kte;
1047 code = find_keytab_entry(context, kt, hostname, &kte);
1049 printerr(0, "ERROR: %s: no usable keytab entry found "
1050 "in keytab %s for connection with host %s\n",
1051 __FUNCTION__, keytabfile, hostname);
1056 ple = get_ple_by_princ(context, kte.principal);
1057 k5_free_kt_entry(context, &kte);
1060 if ((krb5_unparse_name(context, kte.principal, &pname))) {
1063 printerr(0, "ERROR: %s: Could not locate or create "
1064 "ple struct for principal %s for connection "
1066 __FUNCTION__, pname ? pname : "<unparsable>",
1068 if (pname) k5_free_unparsed_name(context, pname);
1072 retval = gssd_get_single_krb5_cred(context, kt, ple);
1075 krb5_kt_close(context, kt);
1076 krb5_free_context(context);
1081 * A common routine for getting the Kerberos error message
1084 gssd_k5_err_msg(krb5_context context, krb5_error_code code)
1086 const char *msg = NULL;
1087 #if HAVE_KRB5_GET_ERROR_MESSAGE
1088 if (context != NULL)
1089 msg = krb5_get_error_message(context, code);
1094 return error_message(code);
1096 if (context != NULL)
1097 return krb5_get_err_text(context, code);
1099 return error_message(code);