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.
96 #endif /* HAVE_CONFIG_H */
102 #include <sys/param.h>
104 #include <sys/stat.h>
105 #include <sys/socket.h>
106 #include <arpa/inet.h>
117 #include <gssapi/gssapi.h>
118 #ifdef USE_PRIVATE_KRB5_FUNCTIONS
119 #include <gssapi/gssapi_krb5.h>
122 #include <rpc/auth_gss.h>
125 #include "err_util.h"
126 #include "gss_util.h"
127 #include "gss_oids.h"
128 #include "krb5_util.h"
130 /* Global list of principals/cache file names for machine credentials */
131 struct gssd_k5_kt_princ *gssd_k5_kt_princ_list = NULL;
133 /*==========================*/
134 /*=== Internal routines ===*/
135 /*==========================*/
137 static int select_krb5_ccache(const struct dirent *d);
138 static int gssd_find_existing_krb5_ccache(uid_t uid, char *dirname,
140 static int gssd_get_single_krb5_cred(krb5_context context,
141 krb5_keytab kt, struct gssd_k5_kt_princ *ple);
142 static int query_krb5_ccache(const char* cred_cache, char **ret_princname,
146 * Called from the scandir function to weed out potential krb5
147 * credentials cache files
150 * 0 => don't select this one
151 * 1 => select this one
154 select_krb5_ccache(const struct dirent *d)
157 * Note: We used to check d->d_type for DT_REG here,
158 * but apparenlty reiser4 always has DT_UNKNOWN.
159 * Check for IS_REG after stat() call instead.
161 if (strstr(d->d_name, GSSD_DEFAULT_CRED_PREFIX))
168 * Look in directory "dirname" for files that look like they
169 * are Kerberos Credential Cache files for a given UID. Return
170 * non-zero and the dirent pointer for the entry most likely to be
171 * what we want. Otherwise, return zero and no dirent pointer.
172 * The caller is responsible for freeing the dirent if one is returned.
175 * 0 => could not find an existing entry
176 * 1 => found an existing entry
179 gssd_find_existing_krb5_ccache(uid_t uid, char *dirname, struct dirent **d)
181 struct dirent **namelist;
185 struct dirent *best_match_dir = NULL;
186 struct stat best_match_stat, tmp_stat;
188 char *princname = NULL;
190 int score, best_match_score = 0;
192 memset(&best_match_stat, 0, sizeof(best_match_stat));
194 n = scandir(dirname, &namelist, select_krb5_ccache, 0);
196 printerr(1, "Error doing scandir on directory '%s': %s\n",
197 dirname, strerror(errno));
201 for (i = 0; i < n; i++) {
202 snprintf(statname, sizeof(statname),
203 "%s/%s", dirname, namelist[i]->d_name);
204 printerr(3, "CC file '%s' being considered, "
205 "with preferred realm '%s'\n",
206 statname, preferred_realm ?
207 preferred_realm : "<none selected>");
208 snprintf(buf, sizeof(buf), "FILE:%s/%s", dirname,
209 namelist[i]->d_name);
210 if (lstat(statname, &tmp_stat)) {
211 printerr(0, "Error doing stat on file '%s'\n",
216 /* Only pick caches owned by the user (uid) */
217 if (tmp_stat.st_uid != uid) {
218 printerr(3, "CC file '%s' owned by %u, not %u\n",
219 statname, tmp_stat.st_uid, uid);
223 if (!S_ISREG(tmp_stat.st_mode)) {
224 printerr(3, "CC file '%s' is not a regular file\n",
229 if (!query_krb5_ccache(buf, &princname, &realm)) {
230 printerr(3, "CC file '%s' is expired or corrupt\n",
237 if (preferred_realm &&
238 strcmp(realm, preferred_realm) == 0)
241 printerr(3, "CC file '%s'(%s@%s) passed all checks and"
242 " has mtime of %u\n",
243 statname, princname, realm,
246 * if more than one match is found, return the most
247 * recent (the one with the latest mtime), and
248 * don't free the dirent
251 best_match_dir = namelist[i];
252 best_match_stat = tmp_stat;
253 best_match_score = score;
258 * If current score is higher than best match
259 * score, we use the current match. Otherwise,
260 * if the current match has an mtime later
261 * than the one we are looking at, then use
262 * the current match. Otherwise, we still
263 * have the best match.
265 if (best_match_score < score ||
266 (best_match_score == score &&
268 best_match_stat.st_mtime)) {
269 free(best_match_dir);
270 best_match_dir = namelist[i];
271 best_match_stat = tmp_stat;
272 best_match_score = score;
277 printerr(3, "CC file '%s/%s' is our "
278 "current best match "
279 "with mtime of %u\n",
280 dirname, best_match_dir->d_name,
281 best_match_stat.st_mtime);
296 #ifdef HAVE_SET_ALLOWABLE_ENCTYPES
298 * this routine obtains a credentials handle via gss_acquire_cred()
299 * then calls gss_krb5_set_allowable_enctypes() to limit the encryption
302 * XXX Should call some function to determine the enctypes supported
303 * by the kernel. (Only need to do that once!)
307 * -1 => there was an error
311 limit_krb5_enctypes(struct rpc_gss_sec *sec, uid_t uid)
313 u_int maj_stat, min_stat;
315 gss_OID_set_desc desired_mechs;
316 krb5_enctype enctypes[] = { ENCTYPE_DES_CBC_CRC,
318 ENCTYPE_DES_CBC_MD4 };
319 int num_enctypes = sizeof(enctypes) / sizeof(enctypes[0]);
321 /* We only care about getting a krb5 cred */
322 desired_mechs.count = 1;
323 desired_mechs.elements = &krb5oid;
325 maj_stat = gss_acquire_cred(&min_stat, NULL, 0,
326 &desired_mechs, GSS_C_INITIATE,
329 if (maj_stat != GSS_S_COMPLETE) {
330 if (get_verbosity() > 0)
331 pgsserr("gss_acquire_cred",
332 maj_stat, min_stat, &krb5oid);
336 maj_stat = gss_set_allowable_enctypes(&min_stat, credh, &krb5oid,
337 num_enctypes, &enctypes);
338 if (maj_stat != GSS_S_COMPLETE) {
339 pgsserr("gss_set_allowable_enctypes",
340 maj_stat, min_stat, &krb5oid);
341 gss_release_cred(&min_stat, &credh);
348 #endif /* HAVE_SET_ALLOWABLE_ENCTYPES */
351 * Obtain credentials via a key in the keytab given
352 * a keytab handle and a gssd_k5_kt_princ structure.
353 * Checks to see if current credentials are expired,
354 * if not, uses the keytab to obtain new credentials.
357 * 0 => success (or credentials have not expired)
361 gssd_get_single_krb5_cred(krb5_context context,
363 struct gssd_k5_kt_princ *ple)
365 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
366 krb5_get_init_creds_opt *init_opts = NULL;
368 krb5_get_init_creds_opt options;
370 krb5_get_init_creds_opt *opts;
372 krb5_ccache ccache = NULL;
373 char kt_name[BUFSIZ];
374 char cc_name[BUFSIZ];
376 time_t now = time(0);
380 memset(&my_creds, 0, sizeof(my_creds));
382 if (ple->ccname && ple->endtime > now) {
383 printerr(2, "INFO: Credentials in CC '%s' are good until %d\n",
384 ple->ccname, ple->endtime);
389 if ((code = krb5_kt_get_name(context, kt, kt_name, BUFSIZ))) {
390 printerr(0, "ERROR: Unable to get keytab name in "
391 "gssd_get_single_krb5_cred\n");
395 if ((krb5_unparse_name(context, ple->princ, &pname)))
398 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
399 code = krb5_get_init_creds_opt_alloc(context, &init_opts);
401 printerr(0, "ERROR: %s allocating gic options\n",
402 gssd_k5_err_msg(context, code));
405 if (krb5_get_init_creds_opt_set_addressless(context, init_opts, 1))
406 printerr(1, "WARNING: Unable to set option for addressless "
407 "tickets. May have problems behind a NAT.\n");
408 #ifdef TEST_SHORT_LIFETIME
409 /* set a short lifetime (for debugging only!) */
410 printerr(0, "WARNING: Using (debug) short machine cred lifetime!\n");
411 krb5_get_init_creds_opt_set_tkt_life(init_opts, 5*60);
415 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS */
417 krb5_get_init_creds_opt_init(&options);
418 krb5_get_init_creds_opt_set_address_list(&options, NULL);
419 #ifdef TEST_SHORT_LIFETIME
420 /* set a short lifetime (for debugging only!) */
421 printerr(0, "WARNING: Using (debug) short machine cred lifetime!\n");
422 krb5_get_init_creds_opt_set_tkt_life(&options, 5*60);
427 if ((code = krb5_get_init_creds_keytab(context, &my_creds, ple->princ,
428 kt, 0, NULL, opts))) {
429 printerr(1, "WARNING: %s while getting initial ticket for "
430 "principal '%s' using keytab '%s'\n",
431 gssd_k5_err_msg(context, code),
432 pname ? pname : "<unparsable>", kt_name);
437 * Initialize cache file which we're going to be using
441 cache_type = "MEMORY";
444 snprintf(cc_name, sizeof(cc_name), "%s:%s/%s%s_%s",
446 ccachesearch[0], GSSD_DEFAULT_CRED_PREFIX,
447 GSSD_DEFAULT_MACHINE_CRED_SUFFIX, ple->realm);
448 ple->endtime = my_creds.times.endtime;
449 if (ple->ccname != NULL)
451 ple->ccname = strdup(cc_name);
452 if (ple->ccname == NULL) {
453 printerr(0, "ERROR: no storage to duplicate credentials "
454 "cache name '%s'\n", cc_name);
458 if ((code = krb5_cc_resolve(context, cc_name, &ccache))) {
459 printerr(0, "ERROR: %s while opening credential cache '%s'\n",
460 gssd_k5_err_msg(context, code), cc_name);
463 if ((code = krb5_cc_initialize(context, ccache, ple->princ))) {
464 printerr(0, "ERROR: %s while initializing credential "
465 "cache '%s'\n", gssd_k5_err_msg(context, code),
469 if ((code = krb5_cc_store_cred(context, ccache, &my_creds))) {
470 printerr(0, "ERROR: %s while storing credentials in '%s'\n",
471 gssd_k5_err_msg(context, code), cc_name);
476 printerr(2, "Successfully obtained machine credentials for "
477 "principal '%s' stored in ccache '%s'\n", pname, cc_name);
479 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
481 krb5_get_init_creds_opt_free(context, init_opts);
484 k5_free_unparsed_name(context, pname);
486 krb5_cc_close(context, ccache);
487 krb5_free_cred_contents(context, &my_creds);
492 * Depending on the version of Kerberos, we either need to use
493 * a private function, or simply set the environment variable.
496 gssd_set_krb5_ccache_name(char *ccname)
498 #ifdef USE_GSS_KRB5_CCACHE_NAME
499 u_int maj_stat, min_stat;
501 printerr(2, "using gss_krb5_ccache_name to select krb5 ccache %s\n",
503 maj_stat = gss_krb5_ccache_name(&min_stat, ccname, NULL);
504 if (maj_stat != GSS_S_COMPLETE) {
505 printerr(0, "WARNING: gss_krb5_ccache_name with "
506 "name '%s' failed (%s)\n",
507 ccname, error_message(min_stat));
511 * Set the KRB5CCNAME environment variable to tell the krb5 code
512 * which credentials cache to use. (Instead of using the private
513 * function above for which there is no generic gssapi
516 printerr(2, "using environment variable to select krb5 ccache %s\n",
518 setenv("KRB5CCNAME", ccname, 1);
523 * Given a principal, find a matching ple structure
525 static struct gssd_k5_kt_princ *
526 find_ple_by_princ(krb5_context context, krb5_principal princ)
528 struct gssd_k5_kt_princ *ple;
530 for (ple = gssd_k5_kt_princ_list; ple != NULL; ple = ple->next) {
531 if (krb5_principal_compare(context, ple->princ, princ))
539 * Create, initialize, and add a new ple structure to the global list
541 static struct gssd_k5_kt_princ *
542 new_ple(krb5_context context, krb5_principal princ)
544 struct gssd_k5_kt_princ *ple = NULL, *p;
545 krb5_error_code code;
547 int is_default_realm = 0;
549 ple = malloc(sizeof(struct gssd_k5_kt_princ));
552 memset(ple, 0, sizeof(*ple));
555 ple->realm = strndup(princ->realm.data,
556 princ->realm.length);
558 ple->realm = strdup(princ->realm);
560 if (ple->realm == NULL)
562 code = krb5_copy_principal(context, princ, &ple->princ);
567 * Add new entry onto the list (if this is the default
568 * realm, always add to the front of the list)
571 code = krb5_get_default_realm(context, &default_realm);
573 if (strcmp(ple->realm, default_realm) == 0)
574 is_default_realm = 1;
575 k5_free_default_realm(context, default_realm);
578 if (is_default_realm) {
579 ple->next = gssd_k5_kt_princ_list;
580 gssd_k5_kt_princ_list = ple;
582 p = gssd_k5_kt_princ_list;
583 while (p != NULL && p->next != NULL)
586 gssd_k5_kt_princ_list = ple;
602 * Given a principal, find an existing ple structure, or create one
604 static struct gssd_k5_kt_princ *
605 get_ple_by_princ(krb5_context context, krb5_principal princ)
607 struct gssd_k5_kt_princ *ple;
609 /* Need to serialize list if we ever become multi-threaded! */
611 ple = find_ple_by_princ(context, princ);
613 ple = new_ple(context, princ);
620 * Given a (possibly unqualified) hostname,
621 * return the fully qualified (lower-case!) hostname
624 get_full_hostname(const char *inhost, char *outhost, int outhostlen)
626 struct addrinfo *addrs = NULL;
627 struct addrinfo hints;
631 memset(&hints, 0, sizeof(hints));
632 hints.ai_socktype = SOCK_STREAM;
633 hints.ai_family = PF_UNSPEC;
634 hints.ai_flags = AI_CANONNAME;
636 /* Get full target hostname */
637 retval = getaddrinfo(inhost, NULL, &hints, &addrs);
639 printerr(1, "%s while getting full hostname for '%s'\n",
640 gai_strerror(retval), inhost);
643 strncpy(outhost, addrs->ai_canonname, outhostlen);
645 for (c = outhost; *c != '\0'; c++)
648 printerr(3, "Full hostname for '%s' is '%s'\n", inhost, outhost);
655 * If principal matches the given realm and service name,
656 * and has *any* instance (hostname), return 1.
657 * Otherwise return 0, indicating no match.
660 realm_and_service_match(krb5_context context, krb5_principal p,
661 const char *realm, const char *service)
664 /* Must have two components */
667 if ((strlen(realm) == p->realm.length)
668 && (strncmp(realm, p->realm.data, p->realm.length) == 0)
669 && (strlen(service) == p->data[0].length)
670 && (strncmp(service, p->data[0].data, p->data[0].length) == 0))
673 const char *name, *inst;
675 if (p->name.name_string.len != 2)
677 name = krb5_principal_get_comp_string(context, p, 0);
678 inst = krb5_principal_get_comp_string(context, p, 1);
679 if (name == NULL || inst == NULL)
681 if ((strcmp(realm, p->realm) == 0)
682 && (strcmp(service, name) == 0))
689 * Search the given keytab file looking for an entry with the given
690 * service name and realm, ignoring hostname (instance).
694 * non-zero => An error occurred
696 * If a keytab entry is found, "found" is set to one, and the keytab
697 * entry is returned in "kte". Otherwise, "found" is zero, and the
698 * value of "kte" is unpredictable.
701 gssd_search_krb5_keytab(krb5_context context, krb5_keytab kt,
702 const char *realm, const char *service,
703 int *found, krb5_keytab_entry *kte)
705 krb5_kt_cursor cursor;
706 krb5_error_code code;
707 struct gssd_k5_kt_princ *ple;
709 char kt_name[BUFSIZ];
719 * Look through each entry in the keytab file and determine
720 * if we might want to use it as machine credentials. If so,
721 * save info in the global principal list (gssd_k5_kt_princ_list).
723 if ((code = krb5_kt_get_name(context, kt, kt_name, BUFSIZ))) {
724 printerr(0, "ERROR: %s attempting to get keytab name\n",
725 gssd_k5_err_msg(context, code));
729 if ((code = krb5_kt_start_seq_get(context, kt, &cursor))) {
730 printerr(0, "ERROR: %s while beginning keytab scan "
732 gssd_k5_err_msg(context, code), kt_name);
737 while ((code = krb5_kt_next_entry(context, kt, kte, &cursor)) == 0) {
738 if ((code = krb5_unparse_name(context, kte->principal,
740 printerr(0, "WARNING: Skipping keytab entry because "
741 "we failed to unparse principal name: %s\n",
742 gssd_k5_err_msg(context, code));
743 k5_free_kt_entry(context, kte);
746 printerr(4, "Processing keytab entry for principal '%s'\n",
748 /* Use the first matching keytab entry found */
749 if ((realm_and_service_match(context, kte->principal, realm,
751 printerr(4, "We WILL use this entry (%s)\n", pname);
752 ple = get_ple_by_princ(context, kte->principal);
754 * Return, don't free, keytab entry if
755 * we were successful!
759 k5_free_kt_entry(context, kte);
764 k5_free_unparsed_name(context, pname);
768 printerr(4, "We will NOT use this entry (%s)\n",
771 k5_free_unparsed_name(context, pname);
772 k5_free_kt_entry(context, kte);
775 if ((code = krb5_kt_end_seq_get(context, kt, &cursor))) {
776 printerr(0, "WARNING: %s while ending keytab scan for "
778 gssd_k5_err_msg(context, code), kt_name);
787 * Find a keytab entry to use for a given target hostname.
788 * Tries to find the most appropriate keytab to use given the
789 * name of the host we are trying to connect with.
792 find_keytab_entry(krb5_context context, krb5_keytab kt, const char *hostname,
793 krb5_keytab_entry *kte)
795 krb5_error_code code;
796 const char *svcnames[] = { "root", "nfs", "host", NULL };
797 char **realmnames = NULL;
798 char myhostname[NI_MAXHOST], targethostname[NI_MAXHOST];
800 char *default_realm = NULL;
802 int tried_all = 0, tried_default = 0;
803 krb5_principal princ;
806 /* Get full target hostname */
807 retval = get_full_hostname(hostname, targethostname,
808 sizeof(targethostname));
812 /* Get full local hostname */
813 retval = gethostname(myhostname, sizeof(myhostname));
815 printerr(1, "%s while getting local hostname\n",
816 gssd_k5_err_msg(context, retval));
819 retval = get_full_hostname(myhostname, myhostname, sizeof(myhostname));
823 code = krb5_get_default_realm(context, &default_realm);
826 printerr(1, "%s while getting default realm name\n",
827 gssd_k5_err_msg(context, code));
832 * Get the realm name(s) for the target hostname.
833 * In reality, this function currently only returns a
834 * single realm, but we code with the assumption that
835 * someday it may actually return a list.
837 code = krb5_get_host_realm(context, targethostname, &realmnames);
839 printerr(0, "ERROR: %s while getting realm(s) for host '%s'\n",
840 gssd_k5_err_msg(context, code), targethostname);
846 * Try the "appropriate" realm first, and if nothing found for that
847 * realm, try the default realm (if it hasn't already been tried).
850 realm = realmnames[i];
855 realm = default_realm;
857 if (tried_all && tried_default)
859 if (strcmp(realm, default_realm) == 0)
861 for (j = 0; svcnames[j] != NULL; j++) {
862 code = krb5_build_principal_ext(context, &princ,
871 printerr(1, "%s while building principal for "
873 gssd_k5_err_msg(context, code),
874 svcnames[j], myhostname, realm);
877 code = krb5_kt_get_entry(context, kt, princ, 0, 0, kte);
878 krb5_free_principal(context, princ);
880 printerr(3, "%s while getting keytab entry for "
882 gssd_k5_err_msg(context, code),
883 svcnames[j], myhostname, realm);
885 printerr(3, "Success getting keytab entry for "
887 svcnames[j], myhostname, realm);
894 * Nothing found with our hostname instance, now look for
895 * names with any instance (they must have an instance)
897 for (j = 0; svcnames[j] != NULL; j++) {
899 code = gssd_search_krb5_keytab(context, kt, realm,
900 svcnames[j], &found, kte);
901 if (!code && found) {
902 printerr(3, "Success getting keytab entry for "
903 "%s/*@%s\n", svcnames[j], realm);
910 realm = realmnames[i];
915 k5_free_default_realm(context, default_realm);
917 krb5_free_host_realm(context, realmnames);
922 static inline int data_is_equal(krb5_data d1, krb5_data d2)
924 return (d1.length == d2.length
925 && memcmp(d1.data, d2.data, d1.length) == 0);
929 check_for_tgt(krb5_context context, krb5_ccache ccache,
930 krb5_principal principal)
937 ret = krb5_cc_start_seq_get(context, ccache, &cur);
942 (ret = krb5_cc_next_cred(context, ccache, &cur, &creds)) == 0) {
943 if (creds.server->length == 2 &&
944 data_is_equal(creds.server->realm,
946 creds.server->data[0].length == 6 &&
947 memcmp(creds.server->data[0].data,
949 data_is_equal(creds.server->data[1],
951 creds.times.endtime > time(NULL))
953 krb5_free_cred_contents(context, &creds);
955 krb5_cc_end_seq_get(context, ccache, &cur);
961 query_krb5_ccache(const char* cred_cache, char **ret_princname,
965 krb5_context context;
967 krb5_principal principal;
972 ret = krb5_init_context(&context);
976 if(!cred_cache || krb5_cc_resolve(context, cred_cache, &ccache))
979 if (krb5_cc_set_flags(context, ccache, 0))
982 ret = krb5_cc_get_principal(context, ccache, &principal);
986 found = check_for_tgt(context, ccache, principal);
988 ret = krb5_unparse_name(context, principal, &princstring);
990 if ((str = strchr(princstring, '@')) != NULL) {
992 *ret_princname = strdup(princstring);
993 *ret_realm = strdup(str+1);
995 k5_free_unparsed_name(context, princstring);
1000 krb5_free_principal(context, principal);
1002 krb5_cc_set_flags(context, ccache, KRB5_TC_OPENCLOSE);
1003 krb5_cc_close(context, ccache);
1005 krb5_free_context(context);
1009 /*==========================*/
1010 /*=== External routines ===*/
1011 /*==========================*/
1014 * Attempt to find the best match for a credentials cache file
1015 * given only a UID. We really need more information, but we
1016 * do the best we can.
1019 * 0 => a ccache was found
1020 * 1 => no ccache was found
1023 gssd_setup_krb5_user_gss_ccache(uid_t uid, char *servername, char *dirname)
1025 char buf[MAX_NETOBJ_SZ];
1028 printerr(2, "getting credentials for client with uid %u for "
1029 "server %s\n", uid, servername);
1030 memset(buf, 0, sizeof(buf));
1031 if (gssd_find_existing_krb5_ccache(uid, dirname, &d)) {
1032 snprintf(buf, sizeof(buf), "FILE:%s/%s", dirname, d->d_name);
1037 printerr(2, "using %s as credentials cache for client with "
1038 "uid %u for server %s\n", buf, uid, servername);
1039 gssd_set_krb5_ccache_name(buf);
1044 * Let the gss code know where to find the machine credentials ccache.
1050 gssd_setup_krb5_machine_gss_ccache(char *ccname)
1052 printerr(2, "using %s as credentials cache for machine creds\n",
1054 gssd_set_krb5_ccache_name(ccname);
1058 * Return an array of pointers to names of credential cache files
1059 * which can be used to try to create gss contexts with a server.
1062 * 0 => list is attached
1066 gssd_get_krb5_machine_cred_list(char ***list)
1070 int listsize = listinc;
1073 struct gssd_k5_kt_princ *ple;
1075 /* Assume failure */
1077 *list = (char **) NULL;
1079 if ((l = (char **) malloc(listsize * sizeof(char *))) == NULL) {
1084 /* Need to serialize list if we ever become multi-threaded! */
1086 for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
1088 /* Make sure cred is up-to-date before returning it */
1089 retval = gssd_refresh_krb5_machine_credential(NULL, ple);
1092 if (i + 1 > listsize) {
1093 listsize += listinc;
1095 realloc(l, listsize * sizeof(char *));
1101 if ((l[i++] = strdup(ple->ccname)) == NULL) {
1118 * Frees the list of names returned in get_krb5_machine_cred_list()
1121 gssd_free_krb5_machine_cred_list(char **list)
1127 for (n = list; n && *n; n++) {
1134 * Called upon exit. Destroys machine credentials.
1137 gssd_destroy_krb5_machine_creds(void)
1139 krb5_context context;
1140 krb5_error_code code = 0;
1142 struct gssd_k5_kt_princ *ple;
1144 code = krb5_init_context(&context);
1146 printerr(0, "ERROR: %s while initializing krb5\n",
1147 gssd_k5_err_msg(NULL, code));
1151 for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
1154 if ((code = krb5_cc_resolve(context, ple->ccname, &ccache))) {
1155 printerr(0, "WARNING: %s while resolving credential "
1156 "cache '%s' for destruction\n",
1157 gssd_k5_err_msg(context, code), ple->ccname);
1161 if ((code = krb5_cc_destroy(context, ccache))) {
1162 printerr(0, "WARNING: %s while destroying credential "
1164 gssd_k5_err_msg(context, code), ple->ccname);
1168 krb5_free_context(context);
1172 * Obtain (or refresh if necessary) Kerberos machine credentials
1175 gssd_refresh_krb5_machine_credential(char *hostname,
1176 struct gssd_k5_kt_princ *ple)
1178 krb5_error_code code = 0;
1179 krb5_context context;
1180 krb5_keytab kt = NULL;;
1183 if (hostname == NULL && ple == NULL)
1186 code = krb5_init_context(&context);
1188 printerr(0, "ERROR: %s: %s while initializing krb5 context\n",
1189 __FUNCTION__, gssd_k5_err_msg(NULL, code));
1194 if ((code = krb5_kt_resolve(context, keytabfile, &kt))) {
1195 printerr(0, "ERROR: %s: %s while resolving keytab '%s'\n",
1196 __FUNCTION__, gssd_k5_err_msg(context, code),
1202 krb5_keytab_entry kte;
1204 code = find_keytab_entry(context, kt, hostname, &kte);
1206 printerr(0, "ERROR: %s: no usable keytab entry found "
1207 "in keytab %s for connection with host %s\n",
1208 __FUNCTION__, keytabfile, hostname);
1213 ple = get_ple_by_princ(context, kte.principal);
1214 k5_free_kt_entry(context, &kte);
1217 if ((krb5_unparse_name(context, kte.principal, &pname))) {
1220 printerr(0, "ERROR: %s: Could not locate or create "
1221 "ple struct for principal %s for connection "
1223 __FUNCTION__, pname ? pname : "<unparsable>",
1225 if (pname) k5_free_unparsed_name(context, pname);
1229 retval = gssd_get_single_krb5_cred(context, kt, ple);
1232 krb5_kt_close(context, kt);
1233 krb5_free_context(context);
1238 * A common routine for getting the Kerberos error message
1241 gssd_k5_err_msg(krb5_context context, krb5_error_code code)
1243 const char *msg = NULL;
1244 #if HAVE_KRB5_GET_ERROR_MESSAGE
1245 if (context != NULL)
1246 msg = krb5_get_error_message(context, code);
1251 return error_message(code);
1253 if (context != NULL)
1254 return krb5_get_err_text(context, code);
1256 return error_message(code);
1261 * Return default Kerberos realm
1264 gssd_k5_get_default_realm(char **def_realm)
1266 krb5_context context;
1268 if (krb5_init_context(&context))
1271 krb5_get_default_realm(context, def_realm);
1273 krb5_free_context(context);