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 (!query_krb5_ccache(buf, &princname, &realm)) {
228 printerr(3, "CC file '%s' is expired or corrupt\n",
236 if (preferred_realm &&
237 strcmp(realm, preferred_realm) == 0)
240 printerr(3, "CC file '%s'(%s@%s) passed all checks and"
241 " has mtime of %u\n",
242 statname, princname, realm,
245 * if more than one match is found, return the most
246 * recent (the one with the latest mtime), and
247 * don't free the dirent
250 best_match_dir = namelist[i];
251 best_match_stat = tmp_stat;
252 best_match_score = score;
257 * If current score is higher than best match
258 * score, we use the current match. Otherwise,
259 * if the current match has an mtime later
260 * than the one we are looking at, then use
261 * the current match. Otherwise, we still
262 * have the best match.
264 if (best_match_score < score ||
265 (best_match_score == score &&
267 best_match_stat.st_mtime)) {
268 free(best_match_dir);
269 best_match_dir = namelist[i];
270 best_match_stat = tmp_stat;
271 best_match_score = score;
276 printerr(3, "CC file '%s/%s' is our "
277 "current best match "
278 "with mtime of %u\n",
279 dirname, best_match_dir->d_name,
280 best_match_stat.st_mtime);
296 * Obtain credentials via a key in the keytab given
297 * a keytab handle and a gssd_k5_kt_princ structure.
298 * Checks to see if current credentials are expired,
299 * if not, uses the keytab to obtain new credentials.
302 * 0 => success (or credentials have not expired)
306 gssd_get_single_krb5_cred(krb5_context context,
308 struct gssd_k5_kt_princ *ple,
311 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
312 krb5_get_init_creds_opt *init_opts = NULL;
314 krb5_get_init_creds_opt options;
316 krb5_get_init_creds_opt *opts;
318 krb5_ccache ccache = NULL;
319 char kt_name[BUFSIZ];
320 char cc_name[BUFSIZ];
322 time_t now = time(0);
327 memset(&my_creds, 0, sizeof(my_creds));
329 if (ple->ccname && ple->endtime > now && !nocache) {
330 printerr(2, "INFO: Credentials in CC '%s' are good until %d\n",
331 ple->ccname, ple->endtime);
336 if ((code = krb5_kt_get_name(context, kt, kt_name, BUFSIZ))) {
337 printerr(0, "ERROR: Unable to get keytab name in "
338 "gssd_get_single_krb5_cred\n");
342 if ((krb5_unparse_name(context, ple->princ, &pname)))
345 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
346 code = krb5_get_init_creds_opt_alloc(context, &init_opts);
348 k5err = gssd_k5_err_msg(context, code);
349 printerr(0, "ERROR: %s allocating gic options\n", k5err);
352 if (krb5_get_init_creds_opt_set_addressless(context, init_opts, 1))
353 printerr(1, "WARNING: Unable to set option for addressless "
354 "tickets. May have problems behind a NAT.\n");
355 #ifdef TEST_SHORT_LIFETIME
356 /* set a short lifetime (for debugging only!) */
357 printerr(0, "WARNING: Using (debug) short machine cred lifetime!\n");
358 krb5_get_init_creds_opt_set_tkt_life(init_opts, 5*60);
362 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS */
364 krb5_get_init_creds_opt_init(&options);
365 krb5_get_init_creds_opt_set_address_list(&options, NULL);
366 #ifdef TEST_SHORT_LIFETIME
367 /* set a short lifetime (for debugging only!) */
368 printerr(0, "WARNING: Using (debug) short machine cred lifetime!\n");
369 krb5_get_init_creds_opt_set_tkt_life(&options, 5*60);
374 if ((code = krb5_get_init_creds_keytab(context, &my_creds, ple->princ,
375 kt, 0, NULL, opts))) {
376 k5err = gssd_k5_err_msg(context, code);
377 printerr(1, "WARNING: %s while getting initial ticket for "
378 "principal '%s' using keytab '%s'\n", k5err,
379 pname ? pname : "<unparsable>", kt_name);
384 * Initialize cache file which we're going to be using
388 cache_type = "MEMORY";
391 snprintf(cc_name, sizeof(cc_name), "%s:%s/%s%s_%s",
393 ccachesearch[0], GSSD_DEFAULT_CRED_PREFIX,
394 GSSD_DEFAULT_MACHINE_CRED_SUFFIX, ple->realm);
395 ple->endtime = my_creds.times.endtime;
396 if (ple->ccname != NULL)
398 ple->ccname = strdup(cc_name);
399 if (ple->ccname == NULL) {
400 printerr(0, "ERROR: no storage to duplicate credentials "
401 "cache name '%s'\n", cc_name);
405 if ((code = krb5_cc_resolve(context, cc_name, &ccache))) {
406 k5err = gssd_k5_err_msg(context, code);
407 printerr(0, "ERROR: %s while opening credential cache '%s'\n",
411 if ((code = krb5_cc_initialize(context, ccache, ple->princ))) {
412 k5err = gssd_k5_err_msg(context, code);
413 printerr(0, "ERROR: %s while initializing credential "
414 "cache '%s'\n", k5err, cc_name);
417 if ((code = krb5_cc_store_cred(context, ccache, &my_creds))) {
418 k5err = gssd_k5_err_msg(context, code);
419 printerr(0, "ERROR: %s while storing credentials in '%s'\n",
425 printerr(2, "Successfully obtained machine credentials for "
426 "principal '%s' stored in ccache '%s'\n", pname, cc_name);
428 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
430 krb5_get_init_creds_opt_free(context, init_opts);
433 k5_free_unparsed_name(context, pname);
435 krb5_cc_close(context, ccache);
436 krb5_free_cred_contents(context, &my_creds);
442 * Depending on the version of Kerberos, we either need to use
443 * a private function, or simply set the environment variable.
446 gssd_set_krb5_ccache_name(char *ccname)
448 #ifdef USE_GSS_KRB5_CCACHE_NAME
449 u_int maj_stat, min_stat;
451 printerr(2, "using gss_krb5_ccache_name to select krb5 ccache %s\n",
453 maj_stat = gss_krb5_ccache_name(&min_stat, ccname, NULL);
454 if (maj_stat != GSS_S_COMPLETE) {
455 printerr(0, "WARNING: gss_krb5_ccache_name with "
456 "name '%s' failed (%s)\n",
457 ccname, error_message(min_stat));
461 * Set the KRB5CCNAME environment variable to tell the krb5 code
462 * which credentials cache to use. (Instead of using the private
463 * function above for which there is no generic gssapi
466 printerr(2, "using environment variable to select krb5 ccache %s\n",
468 setenv("KRB5CCNAME", ccname, 1);
473 * Given a principal, find a matching ple structure
475 static struct gssd_k5_kt_princ *
476 find_ple_by_princ(krb5_context context, krb5_principal princ)
478 struct gssd_k5_kt_princ *ple;
480 for (ple = gssd_k5_kt_princ_list; ple != NULL; ple = ple->next) {
481 if (krb5_principal_compare(context, ple->princ, princ))
489 * Create, initialize, and add a new ple structure to the global list
491 static struct gssd_k5_kt_princ *
492 new_ple(krb5_context context, krb5_principal princ)
494 struct gssd_k5_kt_princ *ple = NULL, *p;
495 krb5_error_code code;
497 int is_default_realm = 0;
499 ple = malloc(sizeof(struct gssd_k5_kt_princ));
502 memset(ple, 0, sizeof(*ple));
505 ple->realm = strndup(princ->realm.data,
506 princ->realm.length);
508 ple->realm = strdup(princ->realm);
510 if (ple->realm == NULL)
512 code = krb5_copy_principal(context, princ, &ple->princ);
517 * Add new entry onto the list (if this is the default
518 * realm, always add to the front of the list)
521 code = krb5_get_default_realm(context, &default_realm);
523 if (strcmp(ple->realm, default_realm) == 0)
524 is_default_realm = 1;
525 k5_free_default_realm(context, default_realm);
528 if (is_default_realm) {
529 ple->next = gssd_k5_kt_princ_list;
530 gssd_k5_kt_princ_list = ple;
532 p = gssd_k5_kt_princ_list;
533 while (p != NULL && p->next != NULL)
536 gssd_k5_kt_princ_list = ple;
552 * Given a principal, find an existing ple structure, or create one
554 static struct gssd_k5_kt_princ *
555 get_ple_by_princ(krb5_context context, krb5_principal princ)
557 struct gssd_k5_kt_princ *ple;
559 /* Need to serialize list if we ever become multi-threaded! */
561 ple = find_ple_by_princ(context, princ);
563 ple = new_ple(context, princ);
570 * Given a (possibly unqualified) hostname,
571 * return the fully qualified (lower-case!) hostname
574 get_full_hostname(const char *inhost, char *outhost, int outhostlen)
576 struct addrinfo *addrs = NULL;
577 struct addrinfo hints;
581 memset(&hints, 0, sizeof(hints));
582 hints.ai_socktype = SOCK_STREAM;
583 hints.ai_family = PF_UNSPEC;
584 hints.ai_flags = AI_CANONNAME;
586 /* Get full target hostname */
587 retval = getaddrinfo(inhost, NULL, &hints, &addrs);
589 printerr(1, "%s while getting full hostname for '%s'\n",
590 gai_strerror(retval), inhost);
593 strncpy(outhost, addrs->ai_canonname, outhostlen);
595 for (c = outhost; *c != '\0'; c++)
598 printerr(3, "Full hostname for '%s' is '%s'\n", inhost, outhost);
605 * If principal matches the given realm and service name,
606 * and has *any* instance (hostname), return 1.
607 * Otherwise return 0, indicating no match.
610 realm_and_service_match(krb5_context context, krb5_principal p,
611 const char *realm, const char *service)
614 /* Must have two components */
617 if ((strlen(realm) == p->realm.length)
618 && (strncmp(realm, p->realm.data, p->realm.length) == 0)
619 && (strlen(service) == p->data[0].length)
620 && (strncmp(service, p->data[0].data, p->data[0].length) == 0))
623 const char *name, *inst;
625 if (p->name.name_string.len != 2)
627 name = krb5_principal_get_comp_string(context, p, 0);
628 inst = krb5_principal_get_comp_string(context, p, 1);
629 if (name == NULL || inst == NULL)
631 if ((strcmp(realm, p->realm) == 0)
632 && (strcmp(service, name) == 0))
639 * Search the given keytab file looking for an entry with the given
640 * service name and realm, ignoring hostname (instance).
644 * non-zero => An error occurred
646 * If a keytab entry is found, "found" is set to one, and the keytab
647 * entry is returned in "kte". Otherwise, "found" is zero, and the
648 * value of "kte" is unpredictable.
651 gssd_search_krb5_keytab(krb5_context context, krb5_keytab kt,
652 const char *realm, const char *service,
653 int *found, krb5_keytab_entry *kte)
655 krb5_kt_cursor cursor;
656 krb5_error_code code;
657 struct gssd_k5_kt_princ *ple;
659 char kt_name[BUFSIZ];
670 * Look through each entry in the keytab file and determine
671 * if we might want to use it as machine credentials. If so,
672 * save info in the global principal list (gssd_k5_kt_princ_list).
674 if ((code = krb5_kt_get_name(context, kt, kt_name, BUFSIZ))) {
675 k5err = gssd_k5_err_msg(context, code);
676 printerr(0, "ERROR: %s attempting to get keytab name\n", k5err);
680 if ((code = krb5_kt_start_seq_get(context, kt, &cursor))) {
681 k5err = gssd_k5_err_msg(context, code);
682 printerr(0, "ERROR: %s while beginning keytab scan "
683 "for keytab '%s'\n", k5err, kt_name);
688 while ((code = krb5_kt_next_entry(context, kt, kte, &cursor)) == 0) {
689 if ((code = krb5_unparse_name(context, kte->principal,
691 k5err = gssd_k5_err_msg(context, code);
692 printerr(0, "WARNING: Skipping keytab entry because "
693 "we failed to unparse principal name: %s\n",
695 k5_free_kt_entry(context, kte);
698 printerr(4, "Processing keytab entry for principal '%s'\n",
700 /* Use the first matching keytab entry found */
701 if ((realm_and_service_match(context, kte->principal, realm,
703 printerr(4, "We WILL use this entry (%s)\n", pname);
704 ple = get_ple_by_princ(context, kte->principal);
706 * Return, don't free, keytab entry if
707 * we were successful!
711 k5_free_kt_entry(context, kte);
716 k5_free_unparsed_name(context, pname);
720 printerr(4, "We will NOT use this entry (%s)\n",
723 k5_free_unparsed_name(context, pname);
724 k5_free_kt_entry(context, kte);
727 if ((code = krb5_kt_end_seq_get(context, kt, &cursor))) {
728 k5err = gssd_k5_err_msg(context, code);
729 printerr(0, "WARNING: %s while ending keytab scan for "
730 "keytab '%s'\n", k5err, kt_name);
740 * Find a keytab entry to use for a given target hostname.
741 * Tries to find the most appropriate keytab to use given the
742 * name of the host we are trying to connect with.
745 find_keytab_entry(krb5_context context, krb5_keytab kt, const char *hostname,
746 krb5_keytab_entry *kte, const char **svcnames)
748 krb5_error_code code;
749 char **realmnames = NULL;
750 char myhostname[NI_MAXHOST], targethostname[NI_MAXHOST];
752 char *default_realm = NULL;
755 int tried_all = 0, tried_default = 0;
756 krb5_principal princ;
759 /* Get full target hostname */
760 retval = get_full_hostname(hostname, targethostname,
761 sizeof(targethostname));
765 /* Get full local hostname */
766 retval = gethostname(myhostname, sizeof(myhostname));
768 k5err = gssd_k5_err_msg(context, retval);
769 printerr(1, "%s while getting local hostname\n", k5err);
772 retval = get_full_hostname(myhostname, myhostname, sizeof(myhostname));
776 code = krb5_get_default_realm(context, &default_realm);
779 k5err = gssd_k5_err_msg(context, code);
780 printerr(1, "%s while getting default realm name\n", k5err);
785 * Get the realm name(s) for the target hostname.
786 * In reality, this function currently only returns a
787 * single realm, but we code with the assumption that
788 * someday it may actually return a list.
790 code = krb5_get_host_realm(context, targethostname, &realmnames);
792 k5err = gssd_k5_err_msg(context, code);
793 printerr(0, "ERROR: %s while getting realm(s) for host '%s'\n",
794 k5err, targethostname);
800 * Try the "appropriate" realm first, and if nothing found for that
801 * realm, try the default realm (if it hasn't already been tried).
804 realm = realmnames[i];
809 realm = default_realm;
811 if (tried_all && tried_default)
813 if (strcmp(realm, default_realm) == 0)
815 for (j = 0; svcnames[j] != NULL; j++) {
816 code = krb5_build_principal_ext(context, &princ,
825 k5err = gssd_k5_err_msg(context, code);
826 printerr(1, "%s while building principal for "
827 "'%s/%s@%s'\n", k5err, svcnames[j],
831 code = krb5_kt_get_entry(context, kt, princ, 0, 0, kte);
832 krb5_free_principal(context, princ);
834 k5err = gssd_k5_err_msg(context, code);
835 printerr(3, "%s while getting keytab entry for "
836 "'%s/%s@%s'\n", k5err, svcnames[j],
839 printerr(3, "Success getting keytab entry for "
841 svcnames[j], myhostname, realm);
848 * Nothing found with our hostname instance, now look for
849 * names with any instance (they must have an instance)
851 for (j = 0; svcnames[j] != NULL; j++) {
853 code = gssd_search_krb5_keytab(context, kt, realm,
854 svcnames[j], &found, kte);
855 if (!code && found) {
856 printerr(3, "Success getting keytab entry for "
857 "%s/*@%s\n", svcnames[j], realm);
864 realm = realmnames[i];
869 k5_free_default_realm(context, default_realm);
871 krb5_free_host_realm(context, realmnames);
877 static inline int data_is_equal(krb5_data d1, krb5_data d2)
879 return (d1.length == d2.length
880 && memcmp(d1.data, d2.data, d1.length) == 0);
884 check_for_tgt(krb5_context context, krb5_ccache ccache,
885 krb5_principal principal)
892 ret = krb5_cc_start_seq_get(context, ccache, &cur);
897 (ret = krb5_cc_next_cred(context, ccache, &cur, &creds)) == 0) {
898 if (creds.server->length == 2 &&
899 data_is_equal(creds.server->realm,
901 creds.server->data[0].length == 6 &&
902 memcmp(creds.server->data[0].data,
904 data_is_equal(creds.server->data[1],
906 creds.times.endtime > time(NULL))
908 krb5_free_cred_contents(context, &creds);
910 krb5_cc_end_seq_get(context, ccache, &cur);
916 query_krb5_ccache(const char* cred_cache, char **ret_princname,
920 krb5_context context;
922 krb5_principal principal;
927 ret = krb5_init_context(&context);
931 if(!cred_cache || krb5_cc_resolve(context, cred_cache, &ccache))
934 if (krb5_cc_set_flags(context, ccache, 0))
937 ret = krb5_cc_get_principal(context, ccache, &principal);
941 found = check_for_tgt(context, ccache, principal);
943 ret = krb5_unparse_name(context, principal, &princstring);
945 if ((str = strchr(princstring, '@')) != NULL) {
947 *ret_princname = strdup(princstring);
948 *ret_realm = strdup(str+1);
950 k5_free_unparsed_name(context, princstring);
955 krb5_free_principal(context, principal);
957 krb5_cc_set_flags(context, ccache, KRB5_TC_OPENCLOSE);
958 krb5_cc_close(context, ccache);
960 krb5_free_context(context);
964 /*==========================*/
965 /*=== External routines ===*/
966 /*==========================*/
969 * Attempt to find the best match for a credentials cache file
970 * given only a UID. We really need more information, but we
971 * do the best we can.
973 * Returns 0 if a ccache was found, and a non-zero error code otherwise.
976 gssd_setup_krb5_user_gss_ccache(uid_t uid, char *servername, char *dirname)
978 char buf[MAX_NETOBJ_SZ];
982 printerr(2, "getting credentials for client with uid %u for "
983 "server %s\n", uid, servername);
984 memset(buf, 0, sizeof(buf));
985 err = gssd_find_existing_krb5_ccache(uid, dirname, &d);
989 snprintf(buf, sizeof(buf), "FILE:%s/%s", dirname, d->d_name);
992 printerr(2, "using %s as credentials cache for client with "
993 "uid %u for server %s\n", buf, uid, servername);
994 gssd_set_krb5_ccache_name(buf);
999 * Let the gss code know where to find the machine credentials ccache.
1005 gssd_setup_krb5_machine_gss_ccache(char *ccname)
1007 printerr(2, "using %s as credentials cache for machine creds\n",
1009 gssd_set_krb5_ccache_name(ccname);
1013 * Return an array of pointers to names of credential cache files
1014 * which can be used to try to create gss contexts with a server.
1017 * 0 => list is attached
1021 gssd_get_krb5_machine_cred_list(char ***list)
1025 int listsize = listinc;
1028 struct gssd_k5_kt_princ *ple;
1030 /* Assume failure */
1032 *list = (char **) NULL;
1034 if ((l = (char **) malloc(listsize * sizeof(char *))) == NULL) {
1039 /* Need to serialize list if we ever become multi-threaded! */
1041 for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
1043 /* Make sure cred is up-to-date before returning it */
1044 retval = gssd_refresh_krb5_machine_credential(NULL, ple,
1048 if (i + 1 > listsize) {
1049 listsize += listinc;
1051 realloc(l, listsize * sizeof(char *));
1057 if ((l[i++] = strdup(ple->ccname)) == NULL) {
1074 * Frees the list of names returned in get_krb5_machine_cred_list()
1077 gssd_free_krb5_machine_cred_list(char **list)
1083 for (n = list; n && *n; n++) {
1090 * Called upon exit. Destroys machine credentials.
1093 gssd_destroy_krb5_machine_creds(void)
1095 krb5_context context;
1096 krb5_error_code code = 0;
1098 struct gssd_k5_kt_princ *ple;
1101 code = krb5_init_context(&context);
1103 k5err = gssd_k5_err_msg(NULL, code);
1104 printerr(0, "ERROR: %s while initializing krb5\n", k5err);
1108 for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
1111 if ((code = krb5_cc_resolve(context, ple->ccname, &ccache))) {
1112 k5err = gssd_k5_err_msg(context, code);
1113 printerr(0, "WARNING: %s while resolving credential "
1114 "cache '%s' for destruction\n", k5err,
1119 if ((code = krb5_cc_destroy(context, ccache))) {
1120 k5err = gssd_k5_err_msg(context, code);
1121 printerr(0, "WARNING: %s while destroying credential "
1122 "cache '%s'\n", k5err, ple->ccname);
1127 krb5_free_context(context);
1131 * Obtain (or refresh if necessary) Kerberos machine credentials
1134 gssd_refresh_krb5_machine_credential(char *hostname,
1135 struct gssd_k5_kt_princ *ple,
1138 krb5_error_code code = 0;
1139 krb5_context context;
1140 krb5_keytab kt = NULL;;
1143 const char *svcnames[4] = { "root", "nfs", "host", NULL };
1146 * If a specific service name was specified, use it.
1147 * Otherwise, use the default list.
1149 if (service != NULL && strcmp(service, "*") != 0) {
1150 svcnames[0] = service;
1153 if (hostname == NULL && ple == NULL)
1156 code = krb5_init_context(&context);
1158 k5err = gssd_k5_err_msg(NULL, code);
1159 printerr(0, "ERROR: %s: %s while initializing krb5 context\n",
1165 if ((code = krb5_kt_resolve(context, keytabfile, &kt))) {
1166 k5err = gssd_k5_err_msg(context, code);
1167 printerr(0, "ERROR: %s: %s while resolving keytab '%s'\n",
1168 __func__, k5err, keytabfile);
1173 krb5_keytab_entry kte;
1175 code = find_keytab_entry(context, kt, hostname, &kte, svcnames);
1177 printerr(0, "ERROR: %s: no usable keytab entry found "
1178 "in keytab %s for connection with host %s\n",
1179 __FUNCTION__, keytabfile, hostname);
1184 ple = get_ple_by_princ(context, kte.principal);
1185 k5_free_kt_entry(context, &kte);
1188 if ((krb5_unparse_name(context, kte.principal, &pname))) {
1191 printerr(0, "ERROR: %s: Could not locate or create "
1192 "ple struct for principal %s for connection "
1194 __FUNCTION__, pname ? pname : "<unparsable>",
1196 if (pname) k5_free_unparsed_name(context, pname);
1200 retval = gssd_get_single_krb5_cred(context, kt, ple, 0);
1203 krb5_kt_close(context, kt);
1204 krb5_free_context(context);
1210 * A common routine for getting the Kerberos error message
1213 gssd_k5_err_msg(krb5_context context, krb5_error_code code)
1215 const char *origmsg;
1218 #if HAVE_KRB5_GET_ERROR_MESSAGE
1219 if (context != NULL) {
1220 origmsg = krb5_get_error_message(context, code);
1221 msg = strdup(origmsg);
1222 krb5_free_error_message(context, origmsg);
1228 return strdup(error_message(code));
1230 if (context != NULL)
1231 return strdup(krb5_get_err_text(context, code));
1233 return strdup(error_message(code));
1238 * Return default Kerberos realm
1241 gssd_k5_get_default_realm(char **def_realm)
1243 krb5_context context;
1245 if (krb5_init_context(&context))
1248 krb5_get_default_realm(context, def_realm);
1250 krb5_free_context(context);
1253 #ifdef HAVE_SET_ALLOWABLE_ENCTYPES
1255 * this routine obtains a credentials handle via gss_acquire_cred()
1256 * then calls gss_krb5_set_allowable_enctypes() to limit the encryption
1259 * XXX Should call some function to determine the enctypes supported
1260 * by the kernel. (Only need to do that once!)
1263 * 0 => all went well
1264 * -1 => there was an error
1268 limit_krb5_enctypes(struct rpc_gss_sec *sec, uid_t uid)
1270 u_int maj_stat, min_stat;
1271 gss_cred_id_t credh;
1272 gss_OID_set_desc desired_mechs;
1273 krb5_enctype enctypes[] = { ENCTYPE_DES_CBC_CRC,
1274 ENCTYPE_DES_CBC_MD5,
1275 ENCTYPE_DES_CBC_MD4 };
1276 int num_enctypes = sizeof(enctypes) / sizeof(enctypes[0]);
1277 extern int num_krb5_enctypes;
1278 extern krb5_enctype *krb5_enctypes;
1280 /* We only care about getting a krb5 cred */
1281 desired_mechs.count = 1;
1282 desired_mechs.elements = &krb5oid;
1284 maj_stat = gss_acquire_cred(&min_stat, NULL, 0,
1285 &desired_mechs, GSS_C_INITIATE,
1286 &credh, NULL, NULL);
1288 if (maj_stat != GSS_S_COMPLETE) {
1289 if (get_verbosity() > 0)
1290 pgsserr("gss_acquire_cred",
1291 maj_stat, min_stat, &krb5oid);
1296 * If we failed for any reason to produce global
1297 * list of supported enctypes, use local default here.
1299 if (krb5_enctypes == NULL)
1300 maj_stat = gss_set_allowable_enctypes(&min_stat, credh,
1301 &krb5oid, num_enctypes, enctypes);
1303 maj_stat = gss_set_allowable_enctypes(&min_stat, credh,
1304 &krb5oid, num_krb5_enctypes, krb5_enctypes);
1306 if (maj_stat != GSS_S_COMPLETE) {
1307 pgsserr("gss_set_allowable_enctypes",
1308 maj_stat, min_stat, &krb5oid);
1309 gss_release_cred(&min_stat, &credh);
1316 #endif /* HAVE_SET_ALLOWABLE_ENCTYPES */