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);
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.
174 * 0 => could not find an existing entry
175 * 1 => found an existing entry
178 gssd_find_existing_krb5_ccache(uid_t uid, char *dirname, struct dirent **d)
180 struct dirent **namelist;
184 struct dirent *best_match_dir = NULL;
185 struct stat best_match_stat, tmp_stat;
187 char *princname = NULL;
189 int score, best_match_score = 0;
191 memset(&best_match_stat, 0, sizeof(best_match_stat));
193 n = scandir(dirname, &namelist, select_krb5_ccache, 0);
195 printerr(1, "Error doing scandir on directory '%s': %s\n",
196 dirname, strerror(errno));
200 for (i = 0; i < n; i++) {
201 snprintf(statname, sizeof(statname),
202 "%s/%s", dirname, namelist[i]->d_name);
203 printerr(3, "CC file '%s' being considered, "
204 "with preferred realm '%s'\n",
205 statname, preferred_realm ?
206 preferred_realm : "<none selected>");
207 snprintf(buf, sizeof(buf), "FILE:%s/%s", dirname,
208 namelist[i]->d_name);
209 if (lstat(statname, &tmp_stat)) {
210 printerr(0, "Error doing stat on file '%s'\n",
215 /* Only pick caches owned by the user (uid) */
216 if (tmp_stat.st_uid != uid) {
217 printerr(3, "CC file '%s' owned by %u, not %u\n",
218 statname, tmp_stat.st_uid, uid);
222 if (!S_ISREG(tmp_stat.st_mode)) {
223 printerr(3, "CC file '%s' is not a regular file\n",
228 if (!query_krb5_ccache(buf, &princname, &realm)) {
229 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);
295 #ifdef HAVE_SET_ALLOWABLE_ENCTYPES
297 * this routine obtains a credentials handle via gss_acquire_cred()
298 * then calls gss_krb5_set_allowable_enctypes() to limit the encryption
301 * XXX Should call some function to determine the enctypes supported
302 * by the kernel. (Only need to do that once!)
306 * -1 => there was an error
310 limit_krb5_enctypes(struct rpc_gss_sec *sec, uid_t uid)
312 u_int maj_stat, min_stat;
314 gss_OID_set_desc desired_mechs;
315 krb5_enctype enctypes[] = { ENCTYPE_DES_CBC_CRC,
317 ENCTYPE_DES_CBC_MD4 };
318 int num_enctypes = sizeof(enctypes) / sizeof(enctypes[0]);
320 /* We only care about getting a krb5 cred */
321 desired_mechs.count = 1;
322 desired_mechs.elements = &krb5oid;
324 maj_stat = gss_acquire_cred(&min_stat, NULL, 0,
325 &desired_mechs, GSS_C_INITIATE,
328 if (maj_stat != GSS_S_COMPLETE) {
329 if (get_verbosity() > 0)
330 pgsserr("gss_acquire_cred",
331 maj_stat, min_stat, &krb5oid);
335 maj_stat = gss_set_allowable_enctypes(&min_stat, credh, &krb5oid,
336 num_enctypes, &enctypes);
337 if (maj_stat != GSS_S_COMPLETE) {
338 pgsserr("gss_set_allowable_enctypes",
339 maj_stat, min_stat, &krb5oid);
340 gss_release_cred(&min_stat, &credh);
347 #endif /* HAVE_SET_ALLOWABLE_ENCTYPES */
350 * Obtain credentials via a key in the keytab given
351 * a keytab handle and a gssd_k5_kt_princ structure.
352 * Checks to see if current credentials are expired,
353 * if not, uses the keytab to obtain new credentials.
356 * 0 => success (or credentials have not expired)
360 gssd_get_single_krb5_cred(krb5_context context,
362 struct gssd_k5_kt_princ *ple)
364 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
365 krb5_get_init_creds_opt *init_opts = NULL;
367 krb5_get_init_creds_opt options;
369 krb5_get_init_creds_opt *opts;
371 krb5_ccache ccache = NULL;
372 char kt_name[BUFSIZ];
373 char cc_name[BUFSIZ];
375 time_t now = time(0);
380 memset(&my_creds, 0, sizeof(my_creds));
382 if (ple->ccname && ple->endtime > now) {
383 printerr(2, "INFO: Credentials in CC '%s' are good until %d\n",
384 ple->ccname, ple->endtime);
389 if ((code = krb5_kt_get_name(context, kt, kt_name, BUFSIZ))) {
390 printerr(0, "ERROR: Unable to get keytab name in "
391 "gssd_get_single_krb5_cred\n");
395 if ((krb5_unparse_name(context, ple->princ, &pname)))
398 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
399 code = krb5_get_init_creds_opt_alloc(context, &init_opts);
401 k5err = gssd_k5_err_msg(context, code);
402 printerr(0, "ERROR: %s allocating gic options\n", k5err);
405 if (krb5_get_init_creds_opt_set_addressless(context, init_opts, 1))
406 printerr(1, "WARNING: Unable to set option for addressless "
407 "tickets. May have problems behind a NAT.\n");
408 #ifdef TEST_SHORT_LIFETIME
409 /* set a short lifetime (for debugging only!) */
410 printerr(0, "WARNING: Using (debug) short machine cred lifetime!\n");
411 krb5_get_init_creds_opt_set_tkt_life(init_opts, 5*60);
415 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS */
417 krb5_get_init_creds_opt_init(&options);
418 krb5_get_init_creds_opt_set_address_list(&options, NULL);
419 #ifdef TEST_SHORT_LIFETIME
420 /* set a short lifetime (for debugging only!) */
421 printerr(0, "WARNING: Using (debug) short machine cred lifetime!\n");
422 krb5_get_init_creds_opt_set_tkt_life(&options, 5*60);
427 if ((code = krb5_get_init_creds_keytab(context, &my_creds, ple->princ,
428 kt, 0, NULL, opts))) {
429 k5err = gssd_k5_err_msg(context, code);
430 printerr(1, "WARNING: %s while getting initial ticket for "
431 "principal '%s' using keytab '%s'\n", k5err,
432 pname ? pname : "<unparsable>", kt_name);
437 * Initialize cache file which we're going to be using
441 cache_type = "MEMORY";
444 snprintf(cc_name, sizeof(cc_name), "%s:%s/%s%s_%s",
446 ccachesearch[0], GSSD_DEFAULT_CRED_PREFIX,
447 GSSD_DEFAULT_MACHINE_CRED_SUFFIX, ple->realm);
448 ple->endtime = my_creds.times.endtime;
449 if (ple->ccname != NULL)
451 ple->ccname = strdup(cc_name);
452 if (ple->ccname == NULL) {
453 printerr(0, "ERROR: no storage to duplicate credentials "
454 "cache name '%s'\n", cc_name);
458 if ((code = krb5_cc_resolve(context, cc_name, &ccache))) {
459 k5err = gssd_k5_err_msg(context, code);
460 printerr(0, "ERROR: %s while opening credential cache '%s'\n",
464 if ((code = krb5_cc_initialize(context, ccache, ple->princ))) {
465 k5err = gssd_k5_err_msg(context, code);
466 printerr(0, "ERROR: %s while initializing credential "
467 "cache '%s'\n", k5err, cc_name);
470 if ((code = krb5_cc_store_cred(context, ccache, &my_creds))) {
471 k5err = gssd_k5_err_msg(context, code);
472 printerr(0, "ERROR: %s while storing credentials in '%s'\n",
478 printerr(2, "Successfully obtained machine credentials for "
479 "principal '%s' stored in ccache '%s'\n", pname, cc_name);
481 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
483 krb5_get_init_creds_opt_free(context, init_opts);
486 k5_free_unparsed_name(context, pname);
488 krb5_cc_close(context, ccache);
489 krb5_free_cred_contents(context, &my_creds);
495 * Depending on the version of Kerberos, we either need to use
496 * a private function, or simply set the environment variable.
499 gssd_set_krb5_ccache_name(char *ccname)
501 #ifdef USE_GSS_KRB5_CCACHE_NAME
502 u_int maj_stat, min_stat;
504 printerr(2, "using gss_krb5_ccache_name to select krb5 ccache %s\n",
506 maj_stat = gss_krb5_ccache_name(&min_stat, ccname, NULL);
507 if (maj_stat != GSS_S_COMPLETE) {
508 printerr(0, "WARNING: gss_krb5_ccache_name with "
509 "name '%s' failed (%s)\n",
510 ccname, error_message(min_stat));
514 * Set the KRB5CCNAME environment variable to tell the krb5 code
515 * which credentials cache to use. (Instead of using the private
516 * function above for which there is no generic gssapi
519 printerr(2, "using environment variable to select krb5 ccache %s\n",
521 setenv("KRB5CCNAME", ccname, 1);
526 * Given a principal, find a matching ple structure
528 static struct gssd_k5_kt_princ *
529 find_ple_by_princ(krb5_context context, krb5_principal princ)
531 struct gssd_k5_kt_princ *ple;
533 for (ple = gssd_k5_kt_princ_list; ple != NULL; ple = ple->next) {
534 if (krb5_principal_compare(context, ple->princ, princ))
542 * Create, initialize, and add a new ple structure to the global list
544 static struct gssd_k5_kt_princ *
545 new_ple(krb5_context context, krb5_principal princ)
547 struct gssd_k5_kt_princ *ple = NULL, *p;
548 krb5_error_code code;
550 int is_default_realm = 0;
552 ple = malloc(sizeof(struct gssd_k5_kt_princ));
555 memset(ple, 0, sizeof(*ple));
558 ple->realm = strndup(princ->realm.data,
559 princ->realm.length);
561 ple->realm = strdup(princ->realm);
563 if (ple->realm == NULL)
565 code = krb5_copy_principal(context, princ, &ple->princ);
570 * Add new entry onto the list (if this is the default
571 * realm, always add to the front of the list)
574 code = krb5_get_default_realm(context, &default_realm);
576 if (strcmp(ple->realm, default_realm) == 0)
577 is_default_realm = 1;
578 k5_free_default_realm(context, default_realm);
581 if (is_default_realm) {
582 ple->next = gssd_k5_kt_princ_list;
583 gssd_k5_kt_princ_list = ple;
585 p = gssd_k5_kt_princ_list;
586 while (p != NULL && p->next != NULL)
589 gssd_k5_kt_princ_list = ple;
605 * Given a principal, find an existing ple structure, or create one
607 static struct gssd_k5_kt_princ *
608 get_ple_by_princ(krb5_context context, krb5_principal princ)
610 struct gssd_k5_kt_princ *ple;
612 /* Need to serialize list if we ever become multi-threaded! */
614 ple = find_ple_by_princ(context, princ);
616 ple = new_ple(context, princ);
623 * Given a (possibly unqualified) hostname,
624 * return the fully qualified (lower-case!) hostname
627 get_full_hostname(const char *inhost, char *outhost, int outhostlen)
629 struct addrinfo *addrs = NULL;
630 struct addrinfo hints;
634 memset(&hints, 0, sizeof(hints));
635 hints.ai_socktype = SOCK_STREAM;
636 hints.ai_family = PF_UNSPEC;
637 hints.ai_flags = AI_CANONNAME;
639 /* Get full target hostname */
640 retval = getaddrinfo(inhost, NULL, &hints, &addrs);
642 printerr(1, "%s while getting full hostname for '%s'\n",
643 gai_strerror(retval), inhost);
646 strncpy(outhost, addrs->ai_canonname, outhostlen);
648 for (c = outhost; *c != '\0'; c++)
651 printerr(3, "Full hostname for '%s' is '%s'\n", inhost, outhost);
658 * If principal matches the given realm and service name,
659 * and has *any* instance (hostname), return 1.
660 * Otherwise return 0, indicating no match.
663 realm_and_service_match(krb5_context context, krb5_principal p,
664 const char *realm, const char *service)
667 /* Must have two components */
670 if ((strlen(realm) == p->realm.length)
671 && (strncmp(realm, p->realm.data, p->realm.length) == 0)
672 && (strlen(service) == p->data[0].length)
673 && (strncmp(service, p->data[0].data, p->data[0].length) == 0))
676 const char *name, *inst;
678 if (p->name.name_string.len != 2)
680 name = krb5_principal_get_comp_string(context, p, 0);
681 inst = krb5_principal_get_comp_string(context, p, 1);
682 if (name == NULL || inst == NULL)
684 if ((strcmp(realm, p->realm) == 0)
685 && (strcmp(service, name) == 0))
692 * Search the given keytab file looking for an entry with the given
693 * service name and realm, ignoring hostname (instance).
697 * non-zero => An error occurred
699 * If a keytab entry is found, "found" is set to one, and the keytab
700 * entry is returned in "kte". Otherwise, "found" is zero, and the
701 * value of "kte" is unpredictable.
704 gssd_search_krb5_keytab(krb5_context context, krb5_keytab kt,
705 const char *realm, const char *service,
706 int *found, krb5_keytab_entry *kte)
708 krb5_kt_cursor cursor;
709 krb5_error_code code;
710 struct gssd_k5_kt_princ *ple;
712 char kt_name[BUFSIZ];
723 * Look through each entry in the keytab file and determine
724 * if we might want to use it as machine credentials. If so,
725 * save info in the global principal list (gssd_k5_kt_princ_list).
727 if ((code = krb5_kt_get_name(context, kt, kt_name, BUFSIZ))) {
728 k5err = gssd_k5_err_msg(context, code);
729 printerr(0, "ERROR: %s attempting to get keytab name\n", k5err);
733 if ((code = krb5_kt_start_seq_get(context, kt, &cursor))) {
734 k5err = gssd_k5_err_msg(context, code);
735 printerr(0, "ERROR: %s while beginning keytab scan "
736 "for keytab '%s'\n", k5err, kt_name);
741 while ((code = krb5_kt_next_entry(context, kt, kte, &cursor)) == 0) {
742 if ((code = krb5_unparse_name(context, kte->principal,
744 k5err = gssd_k5_err_msg(context, code);
745 printerr(0, "WARNING: Skipping keytab entry because "
746 "we failed to unparse principal name: %s\n",
748 k5_free_kt_entry(context, kte);
751 printerr(4, "Processing keytab entry for principal '%s'\n",
753 /* Use the first matching keytab entry found */
754 if ((realm_and_service_match(context, kte->principal, realm,
756 printerr(4, "We WILL use this entry (%s)\n", pname);
757 ple = get_ple_by_princ(context, kte->principal);
759 * Return, don't free, keytab entry if
760 * we were successful!
764 k5_free_kt_entry(context, kte);
769 k5_free_unparsed_name(context, pname);
773 printerr(4, "We will NOT use this entry (%s)\n",
776 k5_free_unparsed_name(context, pname);
777 k5_free_kt_entry(context, kte);
780 if ((code = krb5_kt_end_seq_get(context, kt, &cursor))) {
781 k5err = gssd_k5_err_msg(context, code);
782 printerr(0, "WARNING: %s while ending keytab scan for "
783 "keytab '%s'\n", k5err, kt_name);
793 * Find a keytab entry to use for a given target hostname.
794 * Tries to find the most appropriate keytab to use given the
795 * name of the host we are trying to connect with.
798 find_keytab_entry(krb5_context context, krb5_keytab kt, const char *hostname,
799 krb5_keytab_entry *kte)
801 krb5_error_code code;
802 const char *svcnames[] = { "root", "nfs", "host", NULL };
803 char **realmnames = NULL;
804 char myhostname[NI_MAXHOST], targethostname[NI_MAXHOST];
806 char *default_realm = NULL;
809 int tried_all = 0, tried_default = 0;
810 krb5_principal princ;
813 /* Get full target hostname */
814 retval = get_full_hostname(hostname, targethostname,
815 sizeof(targethostname));
819 /* Get full local hostname */
820 retval = gethostname(myhostname, sizeof(myhostname));
822 k5err = gssd_k5_err_msg(context, retval);
823 printerr(1, "%s while getting local hostname\n", k5err);
826 retval = get_full_hostname(myhostname, myhostname, sizeof(myhostname));
830 code = krb5_get_default_realm(context, &default_realm);
833 k5err = gssd_k5_err_msg(context, code);
834 printerr(1, "%s while getting default realm name\n", k5err);
839 * Get the realm name(s) for the target hostname.
840 * In reality, this function currently only returns a
841 * single realm, but we code with the assumption that
842 * someday it may actually return a list.
844 code = krb5_get_host_realm(context, targethostname, &realmnames);
846 k5err = gssd_k5_err_msg(context, code);
847 printerr(0, "ERROR: %s while getting realm(s) for host '%s'\n",
848 k5err, targethostname);
854 * Try the "appropriate" realm first, and if nothing found for that
855 * realm, try the default realm (if it hasn't already been tried).
858 realm = realmnames[i];
863 realm = default_realm;
865 if (tried_all && tried_default)
867 if (strcmp(realm, default_realm) == 0)
869 for (j = 0; svcnames[j] != NULL; j++) {
870 code = krb5_build_principal_ext(context, &princ,
879 k5err = gssd_k5_err_msg(context, code);
880 printerr(1, "%s while building principal for "
881 "'%s/%s@%s'\n", k5err, svcnames[j],
885 code = krb5_kt_get_entry(context, kt, princ, 0, 0, kte);
886 krb5_free_principal(context, princ);
888 k5err = gssd_k5_err_msg(context, code);
889 printerr(3, "%s while getting keytab entry for "
890 "'%s/%s@%s'\n", k5err, svcnames[j],
893 printerr(3, "Success getting keytab entry for "
895 svcnames[j], myhostname, realm);
902 * Nothing found with our hostname instance, now look for
903 * names with any instance (they must have an instance)
905 for (j = 0; svcnames[j] != NULL; j++) {
907 code = gssd_search_krb5_keytab(context, kt, realm,
908 svcnames[j], &found, kte);
909 if (!code && found) {
910 printerr(3, "Success getting keytab entry for "
911 "%s/*@%s\n", svcnames[j], realm);
918 realm = realmnames[i];
923 k5_free_default_realm(context, default_realm);
925 krb5_free_host_realm(context, realmnames);
931 static inline int data_is_equal(krb5_data d1, krb5_data d2)
933 return (d1.length == d2.length
934 && memcmp(d1.data, d2.data, d1.length) == 0);
938 check_for_tgt(krb5_context context, krb5_ccache ccache,
939 krb5_principal principal)
946 ret = krb5_cc_start_seq_get(context, ccache, &cur);
951 (ret = krb5_cc_next_cred(context, ccache, &cur, &creds)) == 0) {
952 if (creds.server->length == 2 &&
953 data_is_equal(creds.server->realm,
955 creds.server->data[0].length == 6 &&
956 memcmp(creds.server->data[0].data,
958 data_is_equal(creds.server->data[1],
960 creds.times.endtime > time(NULL))
962 krb5_free_cred_contents(context, &creds);
964 krb5_cc_end_seq_get(context, ccache, &cur);
970 query_krb5_ccache(const char* cred_cache, char **ret_princname,
974 krb5_context context;
976 krb5_principal principal;
981 ret = krb5_init_context(&context);
985 if(!cred_cache || krb5_cc_resolve(context, cred_cache, &ccache))
988 if (krb5_cc_set_flags(context, ccache, 0))
991 ret = krb5_cc_get_principal(context, ccache, &principal);
995 found = check_for_tgt(context, ccache, principal);
997 ret = krb5_unparse_name(context, principal, &princstring);
999 if ((str = strchr(princstring, '@')) != NULL) {
1001 *ret_princname = strdup(princstring);
1002 *ret_realm = strdup(str+1);
1004 k5_free_unparsed_name(context, princstring);
1009 krb5_free_principal(context, principal);
1011 krb5_cc_set_flags(context, ccache, KRB5_TC_OPENCLOSE);
1012 krb5_cc_close(context, ccache);
1014 krb5_free_context(context);
1018 /*==========================*/
1019 /*=== External routines ===*/
1020 /*==========================*/
1023 * Attempt to find the best match for a credentials cache file
1024 * given only a UID. We really need more information, but we
1025 * do the best we can.
1028 * 0 => a ccache was found
1029 * 1 => no ccache was found
1032 gssd_setup_krb5_user_gss_ccache(uid_t uid, char *servername, char *dirname)
1034 char buf[MAX_NETOBJ_SZ];
1037 printerr(2, "getting credentials for client with uid %u for "
1038 "server %s\n", uid, servername);
1039 memset(buf, 0, sizeof(buf));
1040 if (gssd_find_existing_krb5_ccache(uid, dirname, &d)) {
1041 snprintf(buf, sizeof(buf), "FILE:%s/%s", dirname, d->d_name);
1046 printerr(2, "using %s as credentials cache for client with "
1047 "uid %u for server %s\n", buf, uid, servername);
1048 gssd_set_krb5_ccache_name(buf);
1053 * Let the gss code know where to find the machine credentials ccache.
1059 gssd_setup_krb5_machine_gss_ccache(char *ccname)
1061 printerr(2, "using %s as credentials cache for machine creds\n",
1063 gssd_set_krb5_ccache_name(ccname);
1067 * Return an array of pointers to names of credential cache files
1068 * which can be used to try to create gss contexts with a server.
1071 * 0 => list is attached
1075 gssd_get_krb5_machine_cred_list(char ***list)
1079 int listsize = listinc;
1082 struct gssd_k5_kt_princ *ple;
1084 /* Assume failure */
1086 *list = (char **) NULL;
1088 if ((l = (char **) malloc(listsize * sizeof(char *))) == NULL) {
1093 /* Need to serialize list if we ever become multi-threaded! */
1095 for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
1097 /* Make sure cred is up-to-date before returning it */
1098 retval = gssd_refresh_krb5_machine_credential(NULL, ple);
1101 if (i + 1 > listsize) {
1102 listsize += listinc;
1104 realloc(l, listsize * sizeof(char *));
1110 if ((l[i++] = strdup(ple->ccname)) == NULL) {
1127 * Frees the list of names returned in get_krb5_machine_cred_list()
1130 gssd_free_krb5_machine_cred_list(char **list)
1136 for (n = list; n && *n; n++) {
1143 * Called upon exit. Destroys machine credentials.
1146 gssd_destroy_krb5_machine_creds(void)
1148 krb5_context context;
1149 krb5_error_code code = 0;
1151 struct gssd_k5_kt_princ *ple;
1154 code = krb5_init_context(&context);
1156 k5err = gssd_k5_err_msg(NULL, code);
1157 printerr(0, "ERROR: %s while initializing krb5\n", k5err);
1161 for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
1164 if ((code = krb5_cc_resolve(context, ple->ccname, &ccache))) {
1165 k5err = gssd_k5_err_msg(context, code);
1166 printerr(0, "WARNING: %s while resolving credential "
1167 "cache '%s' for destruction\n", k5err,
1172 if ((code = krb5_cc_destroy(context, ccache))) {
1173 k5err = gssd_k5_err_msg(context, code);
1174 printerr(0, "WARNING: %s while destroying credential "
1175 "cache '%s'\n", k5err, ple->ccname);
1180 krb5_free_context(context);
1184 * Obtain (or refresh if necessary) Kerberos machine credentials
1187 gssd_refresh_krb5_machine_credential(char *hostname,
1188 struct gssd_k5_kt_princ *ple)
1190 krb5_error_code code = 0;
1191 krb5_context context;
1192 krb5_keytab kt = NULL;;
1196 if (hostname == NULL && ple == NULL)
1199 code = krb5_init_context(&context);
1201 k5err = gssd_k5_err_msg(NULL, code);
1202 printerr(0, "ERROR: %s: %s while initializing krb5 context\n",
1208 if ((code = krb5_kt_resolve(context, keytabfile, &kt))) {
1209 k5err = gssd_k5_err_msg(context, code);
1210 printerr(0, "ERROR: %s: %s while resolving keytab '%s'\n",
1211 __func__, k5err, keytabfile);
1216 krb5_keytab_entry kte;
1218 code = find_keytab_entry(context, kt, hostname, &kte);
1220 printerr(0, "ERROR: %s: no usable keytab entry found "
1221 "in keytab %s for connection with host %s\n",
1222 __FUNCTION__, keytabfile, hostname);
1227 ple = get_ple_by_princ(context, kte.principal);
1228 k5_free_kt_entry(context, &kte);
1231 if ((krb5_unparse_name(context, kte.principal, &pname))) {
1234 printerr(0, "ERROR: %s: Could not locate or create "
1235 "ple struct for principal %s for connection "
1237 __FUNCTION__, pname ? pname : "<unparsable>",
1239 if (pname) k5_free_unparsed_name(context, pname);
1243 retval = gssd_get_single_krb5_cred(context, kt, ple);
1246 krb5_kt_close(context, kt);
1247 krb5_free_context(context);
1253 * A common routine for getting the Kerberos error message
1256 gssd_k5_err_msg(krb5_context context, krb5_error_code code)
1258 const char *origmsg;
1261 #if HAVE_KRB5_GET_ERROR_MESSAGE
1262 if (context != NULL) {
1263 origmsg = krb5_get_error_message(context, code);
1264 msg = strdup(origmsg);
1265 krb5_free_error_message(context, origmsg);
1271 return strdup(error_message(code));
1273 if (context != NULL)
1274 return strdup(krb5_get_err_text(context, code));
1276 return strdup(error_message(code));
1281 * Return default Kerberos realm
1284 gssd_k5_get_default_realm(char **def_realm)
1286 krb5_context context;
1288 if (krb5_init_context(&context))
1291 krb5_get_default_realm(context, def_realm);
1293 krb5_free_context(context);