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 "krb5_util.h"
129 /* Global list of principals/cache file names for machine credentials */
130 struct gssd_k5_kt_princ *gssd_k5_kt_princ_list = NULL;
132 /*==========================*/
133 /*=== Internal routines ===*/
134 /*==========================*/
136 static int select_krb5_ccache(const struct dirent *d);
137 static int gssd_find_existing_krb5_ccache(uid_t uid, char *dirname,
139 static int gssd_get_single_krb5_cred(krb5_context context,
140 krb5_keytab kt, struct gssd_k5_kt_princ *ple, int nocache);
141 static int query_krb5_ccache(const char* cred_cache, char **ret_princname,
145 * Called from the scandir function to weed out potential krb5
146 * credentials cache files
149 * 0 => don't select this one
150 * 1 => select this one
153 select_krb5_ccache(const struct dirent *d)
156 * Note: We used to check d->d_type for DT_REG here,
157 * but apparenlty reiser4 always has DT_UNKNOWN.
158 * Check for IS_REG after stat() call instead.
160 if (strstr(d->d_name, GSSD_DEFAULT_CRED_PREFIX))
167 * Look in directory "dirname" for files that look like they
168 * are Kerberos Credential Cache files for a given UID. Return
169 * non-zero and the dirent pointer for the entry most likely to be
170 * what we want. Otherwise, return zero and no dirent pointer.
171 * The caller is responsible for freeing the dirent if one is returned.
173 * Returns 0 if a valid-looking entry was found and a non-zero error
177 gssd_find_existing_krb5_ccache(uid_t uid, char *dirname, struct dirent **d)
179 struct dirent **namelist;
183 struct dirent *best_match_dir = NULL;
184 struct stat best_match_stat, tmp_stat;
186 char *princname = NULL;
188 int score, best_match_score = 0, err = -EACCES;
190 memset(&best_match_stat, 0, sizeof(best_match_stat));
192 n = scandir(dirname, &namelist, select_krb5_ccache, 0);
194 printerr(1, "Error doing scandir on directory '%s': %s\n",
195 dirname, strerror(errno));
199 for (i = 0; i < n; i++) {
200 snprintf(statname, sizeof(statname),
201 "%s/%s", dirname, namelist[i]->d_name);
202 printerr(3, "CC file '%s' being considered, "
203 "with preferred realm '%s'\n",
204 statname, preferred_realm ?
205 preferred_realm : "<none selected>");
206 snprintf(buf, sizeof(buf), "FILE:%s/%s", dirname,
207 namelist[i]->d_name);
208 if (lstat(statname, &tmp_stat)) {
209 printerr(0, "Error doing stat on file '%s'\n",
214 /* Only pick caches owned by the user (uid) */
215 if (tmp_stat.st_uid != uid) {
216 printerr(3, "CC file '%s' owned by %u, not %u\n",
217 statname, tmp_stat.st_uid, uid);
221 if (!S_ISREG(tmp_stat.st_mode)) {
222 printerr(3, "CC file '%s' is not a regular file\n",
227 if (uid == 0 && !root_uses_machine_creds &&
228 strstr(namelist[i]->d_name, "_machine_")) {
229 printerr(3, "CC file '%s' not available to root\n",
234 if (!query_krb5_ccache(buf, &princname, &realm)) {
235 printerr(3, "CC file '%s' is expired or corrupt\n",
243 if (preferred_realm &&
244 strcmp(realm, preferred_realm) == 0)
247 printerr(3, "CC file '%s'(%s@%s) passed all checks and"
248 " has mtime of %u\n",
249 statname, princname, realm,
252 * if more than one match is found, return the most
253 * recent (the one with the latest mtime), and
254 * don't free the dirent
257 best_match_dir = namelist[i];
258 best_match_stat = tmp_stat;
259 best_match_score = score;
264 * If current score is higher than best match
265 * score, we use the current match. Otherwise,
266 * if the current match has an mtime later
267 * than the one we are looking at, then use
268 * the current match. Otherwise, we still
269 * have the best match.
271 if (best_match_score < score ||
272 (best_match_score == score &&
274 best_match_stat.st_mtime)) {
275 free(best_match_dir);
276 best_match_dir = namelist[i];
277 best_match_stat = tmp_stat;
278 best_match_score = score;
283 printerr(3, "CC file '%s/%s' is our "
284 "current best match "
285 "with mtime of %u\n",
286 dirname, best_match_dir->d_name,
287 best_match_stat.st_mtime);
303 * Obtain credentials via a key in the keytab given
304 * a keytab handle and a gssd_k5_kt_princ structure.
305 * Checks to see if current credentials are expired,
306 * if not, uses the keytab to obtain new credentials.
309 * 0 => success (or credentials have not expired)
313 gssd_get_single_krb5_cred(krb5_context context,
315 struct gssd_k5_kt_princ *ple,
318 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
319 krb5_get_init_creds_opt *init_opts = NULL;
321 krb5_get_init_creds_opt options;
323 krb5_get_init_creds_opt *opts;
325 krb5_ccache ccache = NULL;
326 char kt_name[BUFSIZ];
327 char cc_name[BUFSIZ];
329 time_t now = time(0);
334 memset(&my_creds, 0, sizeof(my_creds));
336 if (ple->ccname && ple->endtime > now && !nocache) {
337 printerr(2, "INFO: Credentials in CC '%s' are good until %d\n",
338 ple->ccname, ple->endtime);
343 if ((code = krb5_kt_get_name(context, kt, kt_name, BUFSIZ))) {
344 printerr(0, "ERROR: Unable to get keytab name in "
345 "gssd_get_single_krb5_cred\n");
349 if ((krb5_unparse_name(context, ple->princ, &pname)))
352 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
353 code = krb5_get_init_creds_opt_alloc(context, &init_opts);
355 k5err = gssd_k5_err_msg(context, code);
356 printerr(0, "ERROR: %s allocating gic options\n", k5err);
359 if (krb5_get_init_creds_opt_set_addressless(context, init_opts, 1))
360 printerr(1, "WARNING: Unable to set option for addressless "
361 "tickets. May have problems behind a NAT.\n");
362 #ifdef TEST_SHORT_LIFETIME
363 /* set a short lifetime (for debugging only!) */
364 printerr(0, "WARNING: Using (debug) short machine cred lifetime!\n");
365 krb5_get_init_creds_opt_set_tkt_life(init_opts, 5*60);
369 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS */
371 krb5_get_init_creds_opt_init(&options);
372 krb5_get_init_creds_opt_set_address_list(&options, NULL);
373 #ifdef TEST_SHORT_LIFETIME
374 /* set a short lifetime (for debugging only!) */
375 printerr(0, "WARNING: Using (debug) short machine cred lifetime!\n");
376 krb5_get_init_creds_opt_set_tkt_life(&options, 5*60);
381 if ((code = krb5_get_init_creds_keytab(context, &my_creds, ple->princ,
382 kt, 0, NULL, opts))) {
383 k5err = gssd_k5_err_msg(context, code);
384 printerr(1, "WARNING: %s while getting initial ticket for "
385 "principal '%s' using keytab '%s'\n", k5err,
386 pname ? pname : "<unparsable>", kt_name);
391 * Initialize cache file which we're going to be using
395 cache_type = "MEMORY";
398 snprintf(cc_name, sizeof(cc_name), "%s:%s/%s%s_%s",
400 ccachesearch[0], GSSD_DEFAULT_CRED_PREFIX,
401 GSSD_DEFAULT_MACHINE_CRED_SUFFIX, ple->realm);
402 ple->endtime = my_creds.times.endtime;
403 if (ple->ccname != NULL)
405 ple->ccname = strdup(cc_name);
406 if (ple->ccname == NULL) {
407 printerr(0, "ERROR: no storage to duplicate credentials "
408 "cache name '%s'\n", cc_name);
412 if ((code = krb5_cc_resolve(context, cc_name, &ccache))) {
413 k5err = gssd_k5_err_msg(context, code);
414 printerr(0, "ERROR: %s while opening credential cache '%s'\n",
418 if ((code = krb5_cc_initialize(context, ccache, ple->princ))) {
419 k5err = gssd_k5_err_msg(context, code);
420 printerr(0, "ERROR: %s while initializing credential "
421 "cache '%s'\n", k5err, cc_name);
424 if ((code = krb5_cc_store_cred(context, ccache, &my_creds))) {
425 k5err = gssd_k5_err_msg(context, code);
426 printerr(0, "ERROR: %s while storing credentials in '%s'\n",
432 printerr(2, "Successfully obtained machine credentials for "
433 "principal '%s' stored in ccache '%s'\n", pname, cc_name);
435 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
437 krb5_get_init_creds_opt_free(context, init_opts);
440 k5_free_unparsed_name(context, pname);
442 krb5_cc_close(context, ccache);
443 krb5_free_cred_contents(context, &my_creds);
449 * Depending on the version of Kerberos, we either need to use
450 * a private function, or simply set the environment variable.
453 gssd_set_krb5_ccache_name(char *ccname)
455 #ifdef USE_GSS_KRB5_CCACHE_NAME
456 u_int maj_stat, min_stat;
458 printerr(2, "using gss_krb5_ccache_name to select krb5 ccache %s\n",
460 maj_stat = gss_krb5_ccache_name(&min_stat, ccname, NULL);
461 if (maj_stat != GSS_S_COMPLETE) {
462 printerr(0, "WARNING: gss_krb5_ccache_name with "
463 "name '%s' failed (%s)\n",
464 ccname, error_message(min_stat));
468 * Set the KRB5CCNAME environment variable to tell the krb5 code
469 * which credentials cache to use. (Instead of using the private
470 * function above for which there is no generic gssapi
473 printerr(2, "using environment variable to select krb5 ccache %s\n",
475 setenv("KRB5CCNAME", ccname, 1);
480 * Given a principal, find a matching ple structure
482 static struct gssd_k5_kt_princ *
483 find_ple_by_princ(krb5_context context, krb5_principal princ)
485 struct gssd_k5_kt_princ *ple;
487 for (ple = gssd_k5_kt_princ_list; ple != NULL; ple = ple->next) {
488 if (krb5_principal_compare(context, ple->princ, princ))
496 * Create, initialize, and add a new ple structure to the global list
498 static struct gssd_k5_kt_princ *
499 new_ple(krb5_context context, krb5_principal princ)
501 struct gssd_k5_kt_princ *ple = NULL, *p;
502 krb5_error_code code;
504 int is_default_realm = 0;
506 ple = malloc(sizeof(struct gssd_k5_kt_princ));
509 memset(ple, 0, sizeof(*ple));
512 ple->realm = strndup(princ->realm.data,
513 princ->realm.length);
515 ple->realm = strdup(princ->realm);
517 if (ple->realm == NULL)
519 code = krb5_copy_principal(context, princ, &ple->princ);
524 * Add new entry onto the list (if this is the default
525 * realm, always add to the front of the list)
528 code = krb5_get_default_realm(context, &default_realm);
530 if (strcmp(ple->realm, default_realm) == 0)
531 is_default_realm = 1;
532 k5_free_default_realm(context, default_realm);
535 if (is_default_realm) {
536 ple->next = gssd_k5_kt_princ_list;
537 gssd_k5_kt_princ_list = ple;
539 p = gssd_k5_kt_princ_list;
540 while (p != NULL && p->next != NULL)
543 gssd_k5_kt_princ_list = ple;
559 * Given a principal, find an existing ple structure, or create one
561 static struct gssd_k5_kt_princ *
562 get_ple_by_princ(krb5_context context, krb5_principal princ)
564 struct gssd_k5_kt_princ *ple;
566 /* Need to serialize list if we ever become multi-threaded! */
568 ple = find_ple_by_princ(context, princ);
570 ple = new_ple(context, princ);
577 * Given a (possibly unqualified) hostname,
578 * return the fully qualified (lower-case!) hostname
581 get_full_hostname(const char *inhost, char *outhost, int outhostlen)
583 struct addrinfo *addrs = NULL;
584 struct addrinfo hints;
588 memset(&hints, 0, sizeof(hints));
589 hints.ai_socktype = SOCK_STREAM;
590 hints.ai_family = PF_UNSPEC;
591 hints.ai_flags = AI_CANONNAME;
593 /* Get full target hostname */
594 retval = getaddrinfo(inhost, NULL, &hints, &addrs);
596 printerr(1, "%s while getting full hostname for '%s'\n",
597 gai_strerror(retval), inhost);
600 strncpy(outhost, addrs->ai_canonname, outhostlen);
602 for (c = outhost; *c != '\0'; c++)
605 printerr(3, "Full hostname for '%s' is '%s'\n", inhost, outhost);
612 * If principal matches the given realm and service name,
613 * and has *any* instance (hostname), return 1.
614 * Otherwise return 0, indicating no match.
618 realm_and_service_match(krb5_principal p, const char *realm, const char *service)
620 /* Must have two components */
624 if ((strlen(realm) == p->realm.length)
625 && (strncmp(realm, p->realm.data, p->realm.length) == 0)
626 && (strlen(service) == p->data[0].length)
627 && (strncmp(service, p->data[0].data, p->data[0].length) == 0))
634 realm_and_service_match(krb5_context context, krb5_principal p,
635 const char *realm, const char *service)
637 const char *name, *inst;
639 if (p->name.name_string.len != 2)
642 name = krb5_principal_get_comp_string(context, p, 0);
643 inst = krb5_principal_get_comp_string(context, p, 1);
644 if (name == NULL || inst == NULL)
646 if ((strcmp(realm, p->realm) == 0)
647 && (strcmp(service, name) == 0))
655 * Search the given keytab file looking for an entry with the given
656 * service name and realm, ignoring hostname (instance).
660 * non-zero => An error occurred
662 * If a keytab entry is found, "found" is set to one, and the keytab
663 * entry is returned in "kte". Otherwise, "found" is zero, and the
664 * value of "kte" is unpredictable.
667 gssd_search_krb5_keytab(krb5_context context, krb5_keytab kt,
668 const char *realm, const char *service,
669 int *found, krb5_keytab_entry *kte)
671 krb5_kt_cursor cursor;
672 krb5_error_code code;
673 struct gssd_k5_kt_princ *ple;
674 int retval = -1, status;
675 char kt_name[BUFSIZ];
686 * Look through each entry in the keytab file and determine
687 * if we might want to use it as machine credentials. If so,
688 * save info in the global principal list (gssd_k5_kt_princ_list).
690 if ((code = krb5_kt_get_name(context, kt, kt_name, BUFSIZ))) {
691 k5err = gssd_k5_err_msg(context, code);
692 printerr(0, "ERROR: %s attempting to get keytab name\n", k5err);
696 if ((code = krb5_kt_start_seq_get(context, kt, &cursor))) {
697 k5err = gssd_k5_err_msg(context, code);
698 printerr(0, "ERROR: %s while beginning keytab scan "
699 "for keytab '%s'\n", k5err, kt_name);
704 while ((code = krb5_kt_next_entry(context, kt, kte, &cursor)) == 0) {
705 if ((code = krb5_unparse_name(context, kte->principal,
707 k5err = gssd_k5_err_msg(context, code);
708 printerr(0, "WARNING: Skipping keytab entry because "
709 "we failed to unparse principal name: %s\n",
711 k5_free_kt_entry(context, kte);
714 printerr(4, "Processing keytab entry for principal '%s'\n",
716 /* Use the first matching keytab entry found */
718 status = realm_and_service_match(kte->principal, realm, service);
720 status = realm_and_service_match(context, kte->principal, realm, service);
723 printerr(4, "We WILL use this entry (%s)\n", pname);
724 ple = get_ple_by_princ(context, kte->principal);
726 * Return, don't free, keytab entry if
727 * we were successful!
731 k5_free_kt_entry(context, kte);
736 k5_free_unparsed_name(context, pname);
740 printerr(4, "We will NOT use this entry (%s)\n",
743 k5_free_unparsed_name(context, pname);
744 k5_free_kt_entry(context, kte);
747 if ((code = krb5_kt_end_seq_get(context, kt, &cursor))) {
748 k5err = gssd_k5_err_msg(context, code);
749 printerr(0, "WARNING: %s while ending keytab scan for "
750 "keytab '%s'\n", k5err, kt_name);
760 * Find a keytab entry to use for a given target hostname.
761 * Tries to find the most appropriate keytab to use given the
762 * name of the host we are trying to connect with.
765 find_keytab_entry(krb5_context context, krb5_keytab kt, const char *hostname,
766 krb5_keytab_entry *kte, const char **svcnames)
768 krb5_error_code code;
769 char **realmnames = NULL;
770 char myhostname[NI_MAXHOST], targethostname[NI_MAXHOST];
772 char *default_realm = NULL;
775 int tried_all = 0, tried_default = 0;
776 krb5_principal princ;
779 /* Get full target hostname */
780 retval = get_full_hostname(hostname, targethostname,
781 sizeof(targethostname));
785 /* Get full local hostname */
786 retval = gethostname(myhostname, sizeof(myhostname));
788 k5err = gssd_k5_err_msg(context, retval);
789 printerr(1, "%s while getting local hostname\n", k5err);
792 retval = get_full_hostname(myhostname, myhostname, sizeof(myhostname));
796 code = krb5_get_default_realm(context, &default_realm);
799 k5err = gssd_k5_err_msg(context, code);
800 printerr(1, "%s while getting default realm name\n", k5err);
805 * Get the realm name(s) for the target hostname.
806 * In reality, this function currently only returns a
807 * single realm, but we code with the assumption that
808 * someday it may actually return a list.
810 code = krb5_get_host_realm(context, targethostname, &realmnames);
812 k5err = gssd_k5_err_msg(context, code);
813 printerr(0, "ERROR: %s while getting realm(s) for host '%s'\n",
814 k5err, targethostname);
820 * Try the "appropriate" realm first, and if nothing found for that
821 * realm, try the default realm (if it hasn't already been tried).
824 realm = realmnames[i];
829 realm = default_realm;
831 if (tried_all && tried_default)
833 if (strcmp(realm, default_realm) == 0)
835 for (j = 0; svcnames[j] != NULL; j++) {
836 code = krb5_build_principal_ext(context, &princ,
845 k5err = gssd_k5_err_msg(context, code);
846 printerr(1, "%s while building principal for "
847 "'%s/%s@%s'\n", k5err, svcnames[j],
851 code = krb5_kt_get_entry(context, kt, princ, 0, 0, kte);
852 krb5_free_principal(context, princ);
854 k5err = gssd_k5_err_msg(context, code);
855 printerr(3, "%s while getting keytab entry for "
856 "'%s/%s@%s'\n", k5err, svcnames[j],
859 printerr(3, "Success getting keytab entry for "
861 svcnames[j], myhostname, realm);
868 * Nothing found with our hostname instance, now look for
869 * names with any instance (they must have an instance)
871 for (j = 0; svcnames[j] != NULL; j++) {
873 code = gssd_search_krb5_keytab(context, kt, realm,
874 svcnames[j], &found, kte);
875 if (!code && found) {
876 printerr(3, "Success getting keytab entry for "
877 "%s/*@%s\n", svcnames[j], realm);
884 realm = realmnames[i];
889 k5_free_default_realm(context, default_realm);
891 krb5_free_host_realm(context, realmnames);
897 static inline int data_is_equal(krb5_data d1, krb5_data d2)
899 return (d1.length == d2.length
900 && memcmp(d1.data, d2.data, d1.length) == 0);
904 check_for_tgt(krb5_context context, krb5_ccache ccache,
905 krb5_principal principal)
912 ret = krb5_cc_start_seq_get(context, ccache, &cur);
917 (ret = krb5_cc_next_cred(context, ccache, &cur, &creds)) == 0) {
918 if (creds.server->length == 2 &&
919 data_is_equal(creds.server->realm,
921 creds.server->data[0].length == 6 &&
922 memcmp(creds.server->data[0].data,
924 data_is_equal(creds.server->data[1],
926 creds.times.endtime > time(NULL))
928 krb5_free_cred_contents(context, &creds);
930 krb5_cc_end_seq_get(context, ccache, &cur);
936 query_krb5_ccache(const char* cred_cache, char **ret_princname,
940 krb5_context context;
942 krb5_principal principal;
947 ret = krb5_init_context(&context);
951 if(!cred_cache || krb5_cc_resolve(context, cred_cache, &ccache))
954 if (krb5_cc_set_flags(context, ccache, 0))
957 ret = krb5_cc_get_principal(context, ccache, &principal);
961 found = check_for_tgt(context, ccache, principal);
963 ret = krb5_unparse_name(context, principal, &princstring);
965 if ((str = strchr(princstring, '@')) != NULL) {
967 *ret_princname = strdup(princstring);
968 *ret_realm = strdup(str+1);
970 k5_free_unparsed_name(context, princstring);
975 krb5_free_principal(context, principal);
977 krb5_cc_set_flags(context, ccache, KRB5_TC_OPENCLOSE);
978 krb5_cc_close(context, ccache);
980 krb5_free_context(context);
984 /*==========================*/
985 /*=== External routines ===*/
986 /*==========================*/
989 * Attempt to find the best match for a credentials cache file
990 * given only a UID. We really need more information, but we
991 * do the best we can.
993 * Returns 0 if a ccache was found, and a non-zero error code otherwise.
996 gssd_setup_krb5_user_gss_ccache(uid_t uid, char *servername, char *dirname)
998 char buf[MAX_NETOBJ_SZ];
1002 printerr(2, "getting credentials for client with uid %u for "
1003 "server %s\n", uid, servername);
1004 memset(buf, 0, sizeof(buf));
1005 err = gssd_find_existing_krb5_ccache(uid, dirname, &d);
1009 snprintf(buf, sizeof(buf), "FILE:%s/%s", dirname, d->d_name);
1012 printerr(2, "using %s as credentials cache for client with "
1013 "uid %u for server %s\n", buf, uid, servername);
1014 gssd_set_krb5_ccache_name(buf);
1019 * Let the gss code know where to find the machine credentials ccache.
1025 gssd_setup_krb5_machine_gss_ccache(char *ccname)
1027 printerr(2, "using %s as credentials cache for machine creds\n",
1029 gssd_set_krb5_ccache_name(ccname);
1033 * Return an array of pointers to names of credential cache files
1034 * which can be used to try to create gss contexts with a server.
1037 * 0 => list is attached
1041 gssd_get_krb5_machine_cred_list(char ***list)
1045 int listsize = listinc;
1048 struct gssd_k5_kt_princ *ple;
1050 /* Assume failure */
1052 *list = (char **) NULL;
1054 if ((l = (char **) malloc(listsize * sizeof(char *))) == NULL) {
1059 /* Need to serialize list if we ever become multi-threaded! */
1061 for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
1063 /* Make sure cred is up-to-date before returning it */
1064 retval = gssd_refresh_krb5_machine_credential(NULL, ple,
1068 if (i + 1 > listsize) {
1069 listsize += listinc;
1071 realloc(l, listsize * sizeof(char *));
1077 if ((l[i++] = strdup(ple->ccname)) == NULL) {
1094 * Frees the list of names returned in get_krb5_machine_cred_list()
1097 gssd_free_krb5_machine_cred_list(char **list)
1103 for (n = list; n && *n; n++) {
1110 * Called upon exit. Destroys machine credentials.
1113 gssd_destroy_krb5_machine_creds(void)
1115 krb5_context context;
1116 krb5_error_code code = 0;
1118 struct gssd_k5_kt_princ *ple;
1121 code = krb5_init_context(&context);
1123 k5err = gssd_k5_err_msg(NULL, code);
1124 printerr(0, "ERROR: %s while initializing krb5\n", k5err);
1128 for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
1131 if ((code = krb5_cc_resolve(context, ple->ccname, &ccache))) {
1132 k5err = gssd_k5_err_msg(context, code);
1133 printerr(0, "WARNING: %s while resolving credential "
1134 "cache '%s' for destruction\n", k5err,
1139 if ((code = krb5_cc_destroy(context, ccache))) {
1140 k5err = gssd_k5_err_msg(context, code);
1141 printerr(0, "WARNING: %s while destroying credential "
1142 "cache '%s'\n", k5err, ple->ccname);
1147 krb5_free_context(context);
1151 * Obtain (or refresh if necessary) Kerberos machine credentials
1154 gssd_refresh_krb5_machine_credential(char *hostname,
1155 struct gssd_k5_kt_princ *ple,
1158 krb5_error_code code = 0;
1159 krb5_context context;
1160 krb5_keytab kt = NULL;;
1163 const char *svcnames[4] = { "root", "nfs", "host", NULL };
1166 * If a specific service name was specified, use it.
1167 * Otherwise, use the default list.
1169 if (service != NULL && strcmp(service, "*") != 0) {
1170 svcnames[0] = service;
1173 if (hostname == NULL && ple == NULL)
1176 code = krb5_init_context(&context);
1178 k5err = gssd_k5_err_msg(NULL, code);
1179 printerr(0, "ERROR: %s: %s while initializing krb5 context\n",
1185 if ((code = krb5_kt_resolve(context, keytabfile, &kt))) {
1186 k5err = gssd_k5_err_msg(context, code);
1187 printerr(0, "ERROR: %s: %s while resolving keytab '%s'\n",
1188 __func__, k5err, keytabfile);
1193 krb5_keytab_entry kte;
1195 code = find_keytab_entry(context, kt, hostname, &kte, svcnames);
1197 printerr(0, "ERROR: %s: no usable keytab entry found "
1198 "in keytab %s for connection with host %s\n",
1199 __FUNCTION__, keytabfile, hostname);
1204 ple = get_ple_by_princ(context, kte.principal);
1205 k5_free_kt_entry(context, &kte);
1208 if ((krb5_unparse_name(context, kte.principal, &pname))) {
1211 printerr(0, "ERROR: %s: Could not locate or create "
1212 "ple struct for principal %s for connection "
1214 __FUNCTION__, pname ? pname : "<unparsable>",
1216 if (pname) k5_free_unparsed_name(context, pname);
1220 retval = gssd_get_single_krb5_cred(context, kt, ple, 0);
1223 krb5_kt_close(context, kt);
1224 krb5_free_context(context);
1230 * A common routine for getting the Kerberos error message
1233 gssd_k5_err_msg(krb5_context context, krb5_error_code code)
1235 const char *origmsg;
1238 #if HAVE_KRB5_GET_ERROR_MESSAGE
1239 if (context != NULL) {
1240 origmsg = krb5_get_error_message(context, code);
1241 msg = strdup(origmsg);
1242 krb5_free_error_message(context, origmsg);
1248 return strdup(error_message(code));
1250 if (context != NULL)
1251 return strdup(krb5_get_err_text(context, code));
1253 return strdup(error_message(code));
1258 * Return default Kerberos realm
1261 gssd_k5_get_default_realm(char **def_realm)
1263 krb5_context context;
1265 if (krb5_init_context(&context))
1268 krb5_get_default_realm(context, def_realm);
1270 krb5_free_context(context);
1273 #ifdef HAVE_SET_ALLOWABLE_ENCTYPES
1275 * this routine obtains a credentials handle via gss_acquire_cred()
1276 * then calls gss_krb5_set_allowable_enctypes() to limit the encryption
1279 * XXX Should call some function to determine the enctypes supported
1280 * by the kernel. (Only need to do that once!)
1283 * 0 => all went well
1284 * -1 => there was an error
1288 limit_krb5_enctypes(struct rpc_gss_sec *sec)
1290 u_int maj_stat, min_stat;
1291 gss_cred_id_t credh;
1292 gss_OID_set_desc desired_mechs;
1293 krb5_enctype enctypes[] = { ENCTYPE_DES_CBC_CRC,
1294 ENCTYPE_DES_CBC_MD5,
1295 ENCTYPE_DES_CBC_MD4 };
1296 int num_enctypes = sizeof(enctypes) / sizeof(enctypes[0]);
1297 extern int num_krb5_enctypes;
1298 extern krb5_enctype *krb5_enctypes;
1300 /* We only care about getting a krb5 cred */
1301 desired_mechs.count = 1;
1302 desired_mechs.elements = &krb5oid;
1304 maj_stat = gss_acquire_cred(&min_stat, NULL, 0,
1305 &desired_mechs, GSS_C_INITIATE,
1306 &credh, NULL, NULL);
1308 if (maj_stat != GSS_S_COMPLETE) {
1309 if (get_verbosity() > 0)
1310 pgsserr("gss_acquire_cred",
1311 maj_stat, min_stat, &krb5oid);
1316 * If we failed for any reason to produce global
1317 * list of supported enctypes, use local default here.
1319 if (krb5_enctypes == NULL)
1320 maj_stat = gss_set_allowable_enctypes(&min_stat, credh,
1321 &krb5oid, num_enctypes, enctypes);
1323 maj_stat = gss_set_allowable_enctypes(&min_stat, credh,
1324 &krb5oid, num_krb5_enctypes, krb5_enctypes);
1326 if (maj_stat != GSS_S_COMPLETE) {
1327 pgsserr("gss_set_allowable_enctypes",
1328 maj_stat, min_stat, &krb5oid);
1329 gss_release_cred(&min_stat, &credh);
1336 #endif /* HAVE_SET_ALLOWABLE_ENCTYPES */