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 #ifdef HAVE_SET_ALLOWABLE_ENCTYPES
133 int limit_to_legacy_enctypes = 0;
136 /*==========================*/
137 /*=== Internal routines ===*/
138 /*==========================*/
140 static int select_krb5_ccache(const struct dirent *d);
141 static int gssd_find_existing_krb5_ccache(uid_t uid, char *dirname,
142 const char **cctype, struct dirent **d);
143 static int gssd_get_single_krb5_cred(krb5_context context,
144 krb5_keytab kt, struct gssd_k5_kt_princ *ple, int nocache);
145 static int query_krb5_ccache(const char* cred_cache, char **ret_princname,
149 * Called from the scandir function to weed out potential krb5
150 * credentials cache files
153 * 0 => don't select this one
154 * 1 => select this one
157 select_krb5_ccache(const struct dirent *d)
160 * Note: We used to check d->d_type for DT_REG here,
161 * but apparenlty reiser4 always has DT_UNKNOWN.
162 * Check for IS_REG after stat() call instead.
164 if (strstr(d->d_name, GSSD_DEFAULT_CRED_PREFIX))
171 * Look in directory "dirname" for files that look like they
172 * are Kerberos Credential Cache files for a given UID.
174 * Returns 0 if a valid-looking entry is found. "*cctype" is
175 * set to the name of the cache type. A pointer to the dirent
176 * is planted in "*d". Caller must free "*d" with free(3).
178 * Otherwise, a negative errno is returned.
181 gssd_find_existing_krb5_ccache(uid_t uid, char *dirname,
182 const char **cctype, struct dirent **d)
184 struct dirent **namelist;
188 struct dirent *best_match_dir = NULL;
189 struct stat best_match_stat, tmp_stat;
191 char *princname = NULL;
193 int score, best_match_score = 0, err = -EACCES;
195 memset(&best_match_stat, 0, sizeof(best_match_stat));
198 n = scandir(dirname, &namelist, select_krb5_ccache, 0);
200 printerr(1, "Error doing scandir on directory '%s': %s\n",
201 dirname, strerror(errno));
205 for (i = 0; i < n; i++) {
206 snprintf(statname, sizeof(statname),
207 "%s/%s", dirname, namelist[i]->d_name);
208 printerr(3, "CC '%s' being considered, "
209 "with preferred realm '%s'\n",
210 statname, preferred_realm ?
211 preferred_realm : "<none selected>");
212 if (lstat(statname, &tmp_stat)) {
213 printerr(0, "Error doing stat on '%s'\n",
218 /* Only pick caches owned by the user (uid) */
219 if (tmp_stat.st_uid != uid) {
220 printerr(3, "CC '%s' owned by %u, not %u\n",
221 statname, tmp_stat.st_uid, uid);
225 if (!S_ISREG(tmp_stat.st_mode) &&
226 !S_ISDIR(tmp_stat.st_mode)) {
227 printerr(3, "CC '%s' is not a regular "
228 "file or directory\n",
233 if (uid == 0 && !root_uses_machine_creds &&
234 strstr(namelist[i]->d_name, "_machine_")) {
235 printerr(3, "CC '%s' not available to root\n",
240 if (S_ISDIR(tmp_stat.st_mode)) {
243 if (S_ISREG(tmp_stat.st_mode)) {
248 snprintf(buf, sizeof(buf), "%s:%s/%s", *cctype,
249 dirname, namelist[i]->d_name);
250 if (!query_krb5_ccache(buf, &princname, &realm)) {
251 printerr(3, "CC '%s' is expired or corrupt\n",
259 if (preferred_realm &&
260 strcmp(realm, preferred_realm) == 0)
263 printerr(3, "CC '%s'(%s@%s) passed all checks and"
264 " has mtime of %u\n",
265 buf, princname, realm,
268 * if more than one match is found, return the most
269 * recent (the one with the latest mtime), and
270 * don't free the dirent
273 best_match_dir = namelist[i];
274 best_match_stat = tmp_stat;
275 best_match_score = score;
280 * If current score is higher than best match
281 * score, we use the current match. Otherwise,
282 * if the current match has an mtime later
283 * than the one we are looking at, then use
284 * the current match. Otherwise, we still
285 * have the best match.
287 if (best_match_score < score ||
288 (best_match_score == score &&
290 best_match_stat.st_mtime)) {
291 free(best_match_dir);
292 best_match_dir = namelist[i];
293 best_match_stat = tmp_stat;
294 best_match_score = score;
299 printerr(3, "CC '%s:%s/%s' is our "
300 "current best match "
301 "with mtime of %u\n",
303 best_match_dir->d_name,
304 best_match_stat.st_mtime);
320 * Obtain credentials via a key in the keytab given
321 * a keytab handle and a gssd_k5_kt_princ structure.
322 * Checks to see if current credentials are expired,
323 * if not, uses the keytab to obtain new credentials.
326 * 0 => success (or credentials have not expired)
330 gssd_get_single_krb5_cred(krb5_context context,
332 struct gssd_k5_kt_princ *ple,
335 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
336 krb5_get_init_creds_opt *init_opts = NULL;
338 krb5_get_init_creds_opt options;
340 krb5_get_init_creds_opt *opts;
342 krb5_ccache ccache = NULL;
343 char kt_name[BUFSIZ];
344 char cc_name[BUFSIZ];
346 time_t now = time(0);
351 memset(&my_creds, 0, sizeof(my_creds));
354 * Workaround for clock skew among NFS server, NFS client and KDC
355 * 300 because clock skew must be within 300sec for kerberos
358 if (ple->ccname && ple->endtime > now && !nocache) {
359 printerr(2, "INFO: Credentials in CC '%s' are good until %d\n",
360 ple->ccname, ple->endtime);
365 if ((code = krb5_kt_get_name(context, kt, kt_name, BUFSIZ))) {
366 printerr(0, "ERROR: Unable to get keytab name in "
367 "gssd_get_single_krb5_cred\n");
371 if ((krb5_unparse_name(context, ple->princ, &pname)))
374 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
375 code = krb5_get_init_creds_opt_alloc(context, &init_opts);
377 k5err = gssd_k5_err_msg(context, code);
378 printerr(0, "ERROR: %s allocating gic options\n", k5err);
381 if (krb5_get_init_creds_opt_set_addressless(context, init_opts, 1))
382 printerr(1, "WARNING: Unable to set option for addressless "
383 "tickets. May have problems behind a NAT.\n");
384 #ifdef TEST_SHORT_LIFETIME
385 /* set a short lifetime (for debugging only!) */
386 printerr(0, "WARNING: Using (debug) short machine cred lifetime!\n");
387 krb5_get_init_creds_opt_set_tkt_life(init_opts, 5*60);
391 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS */
393 krb5_get_init_creds_opt_init(&options);
394 krb5_get_init_creds_opt_set_address_list(&options, NULL);
395 #ifdef TEST_SHORT_LIFETIME
396 /* set a short lifetime (for debugging only!) */
397 printerr(0, "WARNING: Using (debug) short machine cred lifetime!\n");
398 krb5_get_init_creds_opt_set_tkt_life(&options, 5*60);
403 if ((code = krb5_get_init_creds_keytab(context, &my_creds, ple->princ,
404 kt, 0, NULL, opts))) {
405 k5err = gssd_k5_err_msg(context, code);
406 printerr(1, "WARNING: %s while getting initial ticket for "
407 "principal '%s' using keytab '%s'\n", k5err,
408 pname ? pname : "<unparsable>", kt_name);
413 * Initialize cache file which we're going to be using
417 cache_type = "MEMORY";
420 snprintf(cc_name, sizeof(cc_name), "%s:%s/%s%s_%s",
422 ccachesearch[0], GSSD_DEFAULT_CRED_PREFIX,
423 GSSD_DEFAULT_MACHINE_CRED_SUFFIX, ple->realm);
424 ple->endtime = my_creds.times.endtime;
425 if (ple->ccname != NULL)
427 ple->ccname = strdup(cc_name);
428 if (ple->ccname == NULL) {
429 printerr(0, "ERROR: no storage to duplicate credentials "
430 "cache name '%s'\n", cc_name);
434 if ((code = krb5_cc_resolve(context, cc_name, &ccache))) {
435 k5err = gssd_k5_err_msg(context, code);
436 printerr(0, "ERROR: %s while opening credential cache '%s'\n",
440 if ((code = krb5_cc_initialize(context, ccache, ple->princ))) {
441 k5err = gssd_k5_err_msg(context, code);
442 printerr(0, "ERROR: %s while initializing credential "
443 "cache '%s'\n", k5err, cc_name);
446 if ((code = krb5_cc_store_cred(context, ccache, &my_creds))) {
447 k5err = gssd_k5_err_msg(context, code);
448 printerr(0, "ERROR: %s while storing credentials in '%s'\n",
454 printerr(2, "Successfully obtained machine credentials for "
455 "principal '%s' stored in ccache '%s'\n", pname, cc_name);
457 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
459 krb5_get_init_creds_opt_free(context, init_opts);
462 k5_free_unparsed_name(context, pname);
464 krb5_cc_close(context, ccache);
465 krb5_free_cred_contents(context, &my_creds);
471 * Depending on the version of Kerberos, we either need to use
472 * a private function, or simply set the environment variable.
475 gssd_set_krb5_ccache_name(char *ccname)
477 #ifdef USE_GSS_KRB5_CCACHE_NAME
478 u_int maj_stat, min_stat;
480 printerr(2, "using gss_krb5_ccache_name to select krb5 ccache %s\n",
482 maj_stat = gss_krb5_ccache_name(&min_stat, ccname, NULL);
483 if (maj_stat != GSS_S_COMPLETE) {
484 printerr(0, "WARNING: gss_krb5_ccache_name with "
485 "name '%s' failed (%s)\n",
486 ccname, error_message(min_stat));
490 * Set the KRB5CCNAME environment variable to tell the krb5 code
491 * which credentials cache to use. (Instead of using the private
492 * function above for which there is no generic gssapi
495 printerr(2, "using environment variable to select krb5 ccache %s\n",
497 setenv("KRB5CCNAME", ccname, 1);
502 * Given a principal, find a matching ple structure
504 static struct gssd_k5_kt_princ *
505 find_ple_by_princ(krb5_context context, krb5_principal princ)
507 struct gssd_k5_kt_princ *ple;
509 for (ple = gssd_k5_kt_princ_list; ple != NULL; ple = ple->next) {
510 if (krb5_principal_compare(context, ple->princ, princ))
518 * Create, initialize, and add a new ple structure to the global list
520 static struct gssd_k5_kt_princ *
521 new_ple(krb5_context context, krb5_principal princ)
523 struct gssd_k5_kt_princ *ple = NULL, *p;
524 krb5_error_code code;
526 int is_default_realm = 0;
528 ple = malloc(sizeof(struct gssd_k5_kt_princ));
531 memset(ple, 0, sizeof(*ple));
534 ple->realm = strndup(princ->realm.data,
535 princ->realm.length);
537 ple->realm = strdup(princ->realm);
539 if (ple->realm == NULL)
541 code = krb5_copy_principal(context, princ, &ple->princ);
546 * Add new entry onto the list (if this is the default
547 * realm, always add to the front of the list)
550 code = krb5_get_default_realm(context, &default_realm);
552 if (strcmp(ple->realm, default_realm) == 0)
553 is_default_realm = 1;
554 k5_free_default_realm(context, default_realm);
557 if (is_default_realm) {
558 ple->next = gssd_k5_kt_princ_list;
559 gssd_k5_kt_princ_list = ple;
561 p = gssd_k5_kt_princ_list;
562 while (p != NULL && p->next != NULL)
565 gssd_k5_kt_princ_list = ple;
581 * Given a principal, find an existing ple structure, or create one
583 static struct gssd_k5_kt_princ *
584 get_ple_by_princ(krb5_context context, krb5_principal princ)
586 struct gssd_k5_kt_princ *ple;
588 /* Need to serialize list if we ever become multi-threaded! */
590 ple = find_ple_by_princ(context, princ);
592 ple = new_ple(context, princ);
599 * Given a (possibly unqualified) hostname,
600 * return the fully qualified (lower-case!) hostname
603 get_full_hostname(const char *inhost, char *outhost, int outhostlen)
605 struct addrinfo *addrs = NULL;
606 struct addrinfo hints;
610 memset(&hints, 0, sizeof(hints));
611 hints.ai_socktype = SOCK_STREAM;
612 hints.ai_family = PF_UNSPEC;
613 hints.ai_flags = AI_CANONNAME;
615 /* Get full target hostname */
616 retval = getaddrinfo(inhost, NULL, &hints, &addrs);
618 printerr(1, "%s while getting full hostname for '%s'\n",
619 gai_strerror(retval), inhost);
622 strncpy(outhost, addrs->ai_canonname, outhostlen);
624 for (c = outhost; *c != '\0'; c++)
627 printerr(3, "Full hostname for '%s' is '%s'\n", inhost, outhost);
634 * If principal matches the given realm and service name,
635 * and has *any* instance (hostname), return 1.
636 * Otherwise return 0, indicating no match.
640 realm_and_service_match(krb5_principal p, const char *realm, const char *service)
642 /* Must have two components */
646 if ((strlen(realm) == p->realm.length)
647 && (strncmp(realm, p->realm.data, p->realm.length) == 0)
648 && (strlen(service) == p->data[0].length)
649 && (strncmp(service, p->data[0].data, p->data[0].length) == 0))
656 realm_and_service_match(krb5_context context, krb5_principal p,
657 const char *realm, const char *service)
659 const char *name, *inst;
661 if (p->name.name_string.len != 2)
664 name = krb5_principal_get_comp_string(context, p, 0);
665 inst = krb5_principal_get_comp_string(context, p, 1);
666 if (name == NULL || inst == NULL)
668 if ((strcmp(realm, p->realm) == 0)
669 && (strcmp(service, name) == 0))
677 * Search the given keytab file looking for an entry with the given
678 * service name and realm, ignoring hostname (instance).
682 * non-zero => An error occurred
684 * If a keytab entry is found, "found" is set to one, and the keytab
685 * entry is returned in "kte". Otherwise, "found" is zero, and the
686 * value of "kte" is unpredictable.
689 gssd_search_krb5_keytab(krb5_context context, krb5_keytab kt,
690 const char *realm, const char *service,
691 int *found, krb5_keytab_entry *kte)
693 krb5_kt_cursor cursor;
694 krb5_error_code code;
695 struct gssd_k5_kt_princ *ple;
696 int retval = -1, status;
697 char kt_name[BUFSIZ];
708 * Look through each entry in the keytab file and determine
709 * if we might want to use it as machine credentials. If so,
710 * save info in the global principal list (gssd_k5_kt_princ_list).
712 if ((code = krb5_kt_get_name(context, kt, kt_name, BUFSIZ))) {
713 k5err = gssd_k5_err_msg(context, code);
714 printerr(0, "ERROR: %s attempting to get keytab name\n", k5err);
718 if ((code = krb5_kt_start_seq_get(context, kt, &cursor))) {
719 k5err = gssd_k5_err_msg(context, code);
720 printerr(0, "ERROR: %s while beginning keytab scan "
721 "for keytab '%s'\n", k5err, kt_name);
726 while ((code = krb5_kt_next_entry(context, kt, kte, &cursor)) == 0) {
727 if ((code = krb5_unparse_name(context, kte->principal,
729 k5err = gssd_k5_err_msg(context, code);
730 printerr(0, "WARNING: Skipping keytab entry because "
731 "we failed to unparse principal name: %s\n",
733 k5_free_kt_entry(context, kte);
736 printerr(4, "Processing keytab entry for principal '%s'\n",
738 /* Use the first matching keytab entry found */
740 status = realm_and_service_match(kte->principal, realm, service);
742 status = realm_and_service_match(context, kte->principal, realm, service);
745 printerr(4, "We WILL use this entry (%s)\n", pname);
746 ple = get_ple_by_princ(context, kte->principal);
748 * Return, don't free, keytab entry if
749 * we were successful!
753 k5_free_kt_entry(context, kte);
758 k5_free_unparsed_name(context, pname);
762 printerr(4, "We will NOT use this entry (%s)\n",
765 k5_free_unparsed_name(context, pname);
766 k5_free_kt_entry(context, kte);
769 if ((code = krb5_kt_end_seq_get(context, kt, &cursor))) {
770 k5err = gssd_k5_err_msg(context, code);
771 printerr(0, "WARNING: %s while ending keytab scan for "
772 "keytab '%s'\n", k5err, kt_name);
782 * Find a keytab entry to use for a given target realm.
783 * Tries to find the most appropriate keytab to use given the
784 * name of the host we are trying to connect with.
786 * Note: the tgtname contains a hostname in the realm that we
787 * are authenticating to. It may, or may not be the same as
788 * the server hostname.
791 find_keytab_entry(krb5_context context, krb5_keytab kt, const char *tgtname,
792 krb5_keytab_entry *kte, const char **svcnames)
794 krb5_error_code code;
795 char **realmnames = NULL;
796 char myhostname[NI_MAXHOST], targethostname[NI_MAXHOST];
797 char myhostad[NI_MAXHOST+1];
799 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(tgtname, targethostname,
808 sizeof(targethostname));
812 /* Get full local hostname */
813 if (gethostname(myhostname, sizeof(myhostname)) == -1) {
815 k5err = gssd_k5_err_msg(context, retval);
816 printerr(1, "%s while getting local hostname\n", k5err);
820 /* Compute the active directory machine name HOST$ */
821 strcpy(myhostad, myhostname);
822 for (i = 0; myhostad[i] != 0; ++i)
823 myhostad[i] = toupper(myhostad[i]);
827 retval = get_full_hostname(myhostname, myhostname, sizeof(myhostname));
831 code = krb5_get_default_realm(context, &default_realm);
834 k5err = gssd_k5_err_msg(context, code);
835 printerr(1, "%s while getting default realm name\n", k5err);
840 * Get the realm name(s) for the target hostname.
841 * In reality, this function currently only returns a
842 * single realm, but we code with the assumption that
843 * someday it may actually return a list.
845 code = krb5_get_host_realm(context, targethostname, &realmnames);
847 k5err = gssd_k5_err_msg(context, code);
848 printerr(0, "ERROR: %s while getting realm(s) for host '%s'\n",
849 k5err, targethostname);
855 * Try the "appropriate" realm first, and if nothing found for that
856 * realm, try the default realm (if it hasn't already been tried).
859 realm = realmnames[i];
864 realm = default_realm;
866 if (tried_all && tried_default)
868 if (strcmp(realm, default_realm) == 0)
870 for (j = 0; svcnames[j] != NULL; j++) {
874 * The special svcname "$" means 'try the active
875 * directory machine account'
877 if (strcmp(svcnames[j],"$") == 0) {
878 snprintf(spn, sizeof(spn), "%s@%s", myhostad, realm);
879 code = krb5_build_principal_ext(context, &princ,
886 snprintf(spn, sizeof(spn), "%s/%s@%s",
887 svcnames[j], myhostname, realm);
888 code = krb5_build_principal_ext(context, &princ,
899 k5err = gssd_k5_err_msg(context, code);
900 printerr(1, "%s while building principal for '%s'\n",
904 code = krb5_kt_get_entry(context, kt, princ, 0, 0, kte);
905 krb5_free_principal(context, princ);
907 k5err = gssd_k5_err_msg(context, code);
908 printerr(3, "%s while getting keytab entry for '%s'\n",
911 printerr(3, "Success getting keytab entry for '%s'\n",spn);
918 * Nothing found with our hostname instance, now look for
919 * names with any instance (they must have an instance)
921 for (j = 0; svcnames[j] != NULL; j++) {
923 if (strcmp(svcnames[j],"$") == 0)
925 code = gssd_search_krb5_keytab(context, kt, realm,
926 svcnames[j], &found, kte);
927 if (!code && found) {
928 printerr(3, "Success getting keytab entry for "
929 "%s/*@%s\n", svcnames[j], realm);
936 realm = realmnames[i];
941 k5_free_default_realm(context, default_realm);
943 krb5_free_host_realm(context, realmnames);
949 static inline int data_is_equal(krb5_data d1, krb5_data d2)
951 return (d1.length == d2.length
952 && memcmp(d1.data, d2.data, d1.length) == 0);
956 check_for_tgt(krb5_context context, krb5_ccache ccache,
957 krb5_principal principal)
964 ret = krb5_cc_start_seq_get(context, ccache, &cur);
969 (ret = krb5_cc_next_cred(context, ccache, &cur, &creds)) == 0) {
970 if (creds.server->length == 2 &&
971 data_is_equal(creds.server->realm,
973 creds.server->data[0].length == 6 &&
974 memcmp(creds.server->data[0].data,
976 data_is_equal(creds.server->data[1],
978 creds.times.endtime > time(NULL))
980 krb5_free_cred_contents(context, &creds);
982 krb5_cc_end_seq_get(context, ccache, &cur);
988 query_krb5_ccache(const char* cred_cache, char **ret_princname,
992 krb5_context context;
994 krb5_principal principal;
999 ret = krb5_init_context(&context);
1003 if(!cred_cache || krb5_cc_resolve(context, cred_cache, &ccache))
1006 if (krb5_cc_set_flags(context, ccache, 0))
1009 ret = krb5_cc_get_principal(context, ccache, &principal);
1013 found = check_for_tgt(context, ccache, principal);
1015 ret = krb5_unparse_name(context, principal, &princstring);
1017 if ((str = strchr(princstring, '@')) != NULL) {
1019 *ret_princname = strdup(princstring);
1020 *ret_realm = strdup(str+1);
1022 k5_free_unparsed_name(context, princstring);
1027 krb5_free_principal(context, principal);
1029 krb5_cc_set_flags(context, ccache, KRB5_TC_OPENCLOSE);
1030 krb5_cc_close(context, ccache);
1032 krb5_free_context(context);
1036 /*==========================*/
1037 /*=== External routines ===*/
1038 /*==========================*/
1041 * Attempt to find the best match for a credentials cache file
1042 * given only a UID. We really need more information, but we
1043 * do the best we can.
1045 * Returns 0 if a ccache was found, or a negative errno otherwise.
1048 gssd_setup_krb5_user_gss_ccache(uid_t uid, char *servername, char *dirpattern)
1050 char buf[MAX_NETOBJ_SZ], dirname[PATH_MAX];
1055 printerr(2, "getting credentials for client with uid %u for "
1056 "server %s\n", uid, servername);
1058 for (i = 0, j = 0; dirpattern[i] != '\0'; i++) {
1059 switch (dirpattern[i]) {
1061 switch (dirpattern[i + 1]) {
1063 dirname[j++] = dirpattern[i];
1067 j += sprintf(dirname + j, "%lu",
1068 (unsigned long) uid);
1074 dirname[j++] = dirpattern[i];
1080 err = gssd_find_existing_krb5_ccache(uid, dirname, &cctype, &d);
1084 snprintf(buf, sizeof(buf), "%s:%s/%s", cctype, dirname, d->d_name);
1087 printerr(2, "using %s as credentials cache for client with "
1088 "uid %u for server %s\n", buf, uid, servername);
1089 gssd_set_krb5_ccache_name(buf);
1094 * Let the gss code know where to find the machine credentials ccache.
1100 gssd_setup_krb5_machine_gss_ccache(char *ccname)
1102 printerr(2, "using %s as credentials cache for machine creds\n",
1104 gssd_set_krb5_ccache_name(ccname);
1108 * Return an array of pointers to names of credential cache files
1109 * which can be used to try to create gss contexts with a server.
1112 * 0 => list is attached
1116 gssd_get_krb5_machine_cred_list(char ***list)
1120 int listsize = listinc;
1123 struct gssd_k5_kt_princ *ple;
1125 /* Assume failure */
1127 *list = (char **) NULL;
1129 if ((l = (char **) malloc(listsize * sizeof(char *))) == NULL) {
1134 /* Need to serialize list if we ever become multi-threaded! */
1136 for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
1138 /* Make sure cred is up-to-date before returning it */
1139 retval = gssd_refresh_krb5_machine_credential(NULL, ple,
1143 if (i + 1 > listsize) {
1144 listsize += listinc;
1146 realloc(l, listsize * sizeof(char *));
1152 if ((l[i++] = strdup(ple->ccname)) == NULL) {
1169 * Frees the list of names returned in get_krb5_machine_cred_list()
1172 gssd_free_krb5_machine_cred_list(char **list)
1178 for (n = list; n && *n; n++) {
1185 * Called upon exit. Destroys machine credentials.
1188 gssd_destroy_krb5_machine_creds(void)
1190 krb5_context context;
1191 krb5_error_code code = 0;
1193 struct gssd_k5_kt_princ *ple;
1196 code = krb5_init_context(&context);
1198 k5err = gssd_k5_err_msg(NULL, code);
1199 printerr(0, "ERROR: %s while initializing krb5\n", k5err);
1203 for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
1206 if ((code = krb5_cc_resolve(context, ple->ccname, &ccache))) {
1207 k5err = gssd_k5_err_msg(context, code);
1208 printerr(0, "WARNING: %s while resolving credential "
1209 "cache '%s' for destruction\n", k5err,
1214 if ((code = krb5_cc_destroy(context, ccache))) {
1215 k5err = gssd_k5_err_msg(context, code);
1216 printerr(0, "WARNING: %s while destroying credential "
1217 "cache '%s'\n", k5err, ple->ccname);
1220 krb5_free_context(context);
1226 * Obtain (or refresh if necessary) Kerberos machine credentials
1229 gssd_refresh_krb5_machine_credential(char *hostname,
1230 struct gssd_k5_kt_princ *ple,
1234 krb5_error_code code = 0;
1235 krb5_context context;
1236 krb5_keytab kt = NULL;;
1239 const char *svcnames[5] = { "$", "root", "nfs", "host", NULL };
1242 * If a specific service name was specified, use it.
1243 * Otherwise, use the default list.
1245 if (service != NULL && strcmp(service, "*") != 0) {
1246 svcnames[0] = service;
1249 if (hostname == NULL && ple == NULL)
1252 code = krb5_init_context(&context);
1254 k5err = gssd_k5_err_msg(NULL, code);
1255 printerr(0, "ERROR: %s: %s while initializing krb5 context\n",
1261 if ((code = krb5_kt_resolve(context, keytabfile, &kt))) {
1262 k5err = gssd_k5_err_msg(context, code);
1263 printerr(0, "ERROR: %s: %s while resolving keytab '%s'\n",
1264 __func__, k5err, keytabfile);
1265 goto out_free_context;
1269 krb5_keytab_entry kte;
1271 if (tgtname == NULL)
1274 code = find_keytab_entry(context, kt, tgtname, &kte, svcnames);
1276 printerr(0, "ERROR: %s: no usable keytab entry found "
1277 "in keytab %s for connection with host %s\n",
1278 __FUNCTION__, keytabfile, hostname);
1283 ple = get_ple_by_princ(context, kte.principal);
1284 k5_free_kt_entry(context, &kte);
1287 if ((krb5_unparse_name(context, kte.principal, &pname))) {
1290 printerr(0, "ERROR: %s: Could not locate or create "
1291 "ple struct for principal %s for connection "
1293 __FUNCTION__, pname ? pname : "<unparsable>",
1295 if (pname) k5_free_unparsed_name(context, pname);
1299 retval = gssd_get_single_krb5_cred(context, kt, ple, 0);
1301 krb5_kt_close(context, kt);
1303 krb5_free_context(context);
1310 * A common routine for getting the Kerberos error message
1313 gssd_k5_err_msg(krb5_context context, krb5_error_code code)
1315 const char *origmsg;
1318 #if HAVE_KRB5_GET_ERROR_MESSAGE
1319 if (context != NULL) {
1320 origmsg = krb5_get_error_message(context, code);
1321 msg = strdup(origmsg);
1322 krb5_free_error_message(context, origmsg);
1328 return strdup(error_message(code));
1330 if (context != NULL)
1331 return strdup(krb5_get_err_text(context, code));
1333 return strdup(error_message(code));
1338 * Return default Kerberos realm
1341 gssd_k5_get_default_realm(char **def_realm)
1343 krb5_context context;
1345 if (krb5_init_context(&context))
1348 krb5_get_default_realm(context, def_realm);
1350 krb5_free_context(context);
1354 gssd_acquire_krb5_cred(gss_name_t name, gss_cred_id_t *gss_cred)
1356 OM_uint32 maj_stat, min_stat;
1357 gss_OID_set_desc desired_mechs = { 1, &krb5oid };
1359 maj_stat = gss_acquire_cred(&min_stat, name, GSS_C_INDEFINITE,
1360 &desired_mechs, GSS_C_INITIATE,
1361 gss_cred, NULL, NULL);
1363 if (maj_stat != GSS_S_COMPLETE) {
1364 if (get_verbosity() > 0)
1365 pgsserr("gss_acquire_cred",
1366 maj_stat, min_stat, &krb5oid);
1374 gssd_acquire_user_cred(uid_t uid, gss_cred_id_t *gss_cred)
1376 OM_uint32 maj_stat, min_stat;
1377 gss_buffer_desc name_buf;
1382 ret = snprintf(buf, 11, "%u", uid);
1383 if (ret < 1 || ret > 10) {
1386 name_buf.value = buf;
1387 name_buf.length = ret + 1;
1389 maj_stat = gss_import_name(&min_stat, &name_buf,
1390 GSS_C_NT_STRING_UID_NAME, &name);
1391 if (maj_stat != GSS_S_COMPLETE) {
1392 if (get_verbosity() > 0)
1393 pgsserr("gss_import_name",
1394 maj_stat, min_stat, &krb5oid);
1398 ret = gssd_acquire_krb5_cred(name, gss_cred);
1400 maj_stat = gss_release_name(&min_stat, &name);
1404 #ifdef HAVE_SET_ALLOWABLE_ENCTYPES
1406 * this routine obtains a credentials handle via gss_acquire_cred()
1407 * then calls gss_krb5_set_allowable_enctypes() to limit the encryption
1410 * XXX Should call some function to determine the enctypes supported
1411 * by the kernel. (Only need to do that once!)
1414 * 0 => all went well
1415 * -1 => there was an error
1419 limit_krb5_enctypes(struct rpc_gss_sec *sec)
1421 u_int maj_stat, min_stat;
1422 krb5_enctype enctypes[] = { ENCTYPE_DES_CBC_CRC,
1423 ENCTYPE_DES_CBC_MD5,
1424 ENCTYPE_DES_CBC_MD4 };
1425 int num_enctypes = sizeof(enctypes) / sizeof(enctypes[0]);
1426 extern int num_krb5_enctypes;
1427 extern krb5_enctype *krb5_enctypes;
1430 if (sec->cred == GSS_C_NO_CREDENTIAL) {
1431 err = gssd_acquire_krb5_cred(GSS_C_NO_NAME, &sec->cred);
1437 * If we failed for any reason to produce global
1438 * list of supported enctypes, use local default here.
1440 if (krb5_enctypes == NULL || limit_to_legacy_enctypes)
1441 maj_stat = gss_set_allowable_enctypes(&min_stat, sec->cred,
1442 &krb5oid, num_enctypes, enctypes);
1444 maj_stat = gss_set_allowable_enctypes(&min_stat, sec->cred,
1445 &krb5oid, num_krb5_enctypes, krb5_enctypes);
1447 if (maj_stat != GSS_S_COMPLETE) {
1448 pgsserr("gss_set_allowable_enctypes",
1449 maj_stat, min_stat, &krb5oid);
1455 #endif /* HAVE_SET_ALLOWABLE_ENCTYPES */