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.
98 #include <sys/param.h>
100 #include <sys/stat.h>
101 #include <sys/socket.h>
102 #include <arpa/inet.h>
113 #include <gssapi/gssapi.h>
114 #ifdef USE_PRIVATE_KRB5_FUNCTIONS
115 #include <gssapi/gssapi_krb5.h>
118 #include <rpc/auth_gss.h>
121 #include "err_util.h"
122 #include "gss_util.h"
123 #include "gss_oids.h"
124 #include "krb5_util.h"
126 /* Global list of principals/cache file names for machine credentials */
127 struct gssd_k5_kt_princ *gssd_k5_kt_princ_list = NULL;
129 /*==========================*/
130 /*=== Internal routines ===*/
131 /*==========================*/
133 static int select_krb5_ccache(const struct dirent *d);
134 static int gssd_find_existing_krb5_ccache(uid_t uid, char *dirname,
136 static int gssd_get_single_krb5_cred(krb5_context context,
137 krb5_keytab kt, struct gssd_k5_kt_princ *ple);
138 static int query_krb5_ccache(const char* cred_cache, char **ret_princname,
142 * Called from the scandir function to weed out potential krb5
143 * credentials cache files
146 * 0 => don't select this one
147 * 1 => select this one
150 select_krb5_ccache(const struct dirent *d)
153 * Note: We used to check d->d_type for DT_REG here,
154 * but apparenlty reiser4 always has DT_UNKNOWN.
155 * Check for IS_REG after stat() call instead.
157 if (strstr(d->d_name, GSSD_DEFAULT_CRED_PREFIX))
164 * Look in directory "dirname" for files that look like they
165 * are Kerberos Credential Cache files for a given UID. Return
166 * non-zero and the dirent pointer for the entry most likely to be
167 * what we want. Otherwise, return zero and no dirent pointer.
168 * The caller is responsible for freeing the dirent if one is returned.
171 * 0 => could not find an existing entry
172 * 1 => found an existing entry
175 gssd_find_existing_krb5_ccache(uid_t uid, char *dirname, struct dirent **d)
177 struct dirent **namelist;
181 struct dirent *best_match_dir = NULL;
182 struct stat best_match_stat, tmp_stat;
184 char *princname = NULL;
186 int score, best_match_score = 0;
188 memset(&best_match_stat, 0, sizeof(best_match_stat));
190 n = scandir(dirname, &namelist, select_krb5_ccache, 0);
192 printerr(1, "Error doing scandir on directory '%s': %s\n",
193 dirname, strerror(errno));
197 for (i = 0; i < n; i++) {
198 snprintf(statname, sizeof(statname),
199 "%s/%s", dirname, namelist[i]->d_name);
200 printerr(3, "CC file '%s' being considered, "
201 "with preferred realm '%s'\n",
202 statname, preferred_realm ?
203 preferred_realm : "<none selected>");
204 snprintf(buf, sizeof(buf), "FILE:%s/%s", dirname,
205 namelist[i]->d_name);
206 if (lstat(statname, &tmp_stat)) {
207 printerr(0, "Error doing stat on file '%s'\n",
212 /* Only pick caches owned by the user (uid) */
213 if (tmp_stat.st_uid != uid) {
214 printerr(3, "CC file '%s' owned by %u, not %u\n",
215 statname, tmp_stat.st_uid, uid);
219 if (!S_ISREG(tmp_stat.st_mode)) {
220 printerr(3, "CC file '%s' is not a regular file\n",
225 if (!query_krb5_ccache(buf, &princname, &realm)) {
226 printerr(3, "CC file '%s' is expired or corrupt\n",
233 if (preferred_realm &&
234 strcmp(realm, preferred_realm) == 0)
237 printerr(3, "CC file '%s'(%s@%s) passed all checks and"
238 " has mtime of %u\n",
239 statname, princname, realm,
242 * if more than one match is found, return the most
243 * recent (the one with the latest mtime), and
244 * don't free the dirent
247 best_match_dir = namelist[i];
248 best_match_stat = tmp_stat;
249 best_match_score = score;
254 * If current score is higher than best match
255 * score, we use the current match. Otherwise,
256 * if the current match has an mtime later
257 * than the one we are looking at, then use
258 * the current match. Otherwise, we still
259 * have the best match.
261 if (best_match_score < score ||
262 (best_match_score == score &&
264 best_match_stat.st_mtime)) {
265 free(best_match_dir);
266 best_match_dir = namelist[i];
267 best_match_stat = tmp_stat;
268 best_match_score = score;
273 printerr(3, "CC file '%s/%s' is our "
274 "current best match "
275 "with mtime of %u\n",
276 dirname, best_match_dir->d_name,
277 best_match_stat.st_mtime);
292 #ifdef HAVE_SET_ALLOWABLE_ENCTYPES
294 * this routine obtains a credentials handle via gss_acquire_cred()
295 * then calls gss_krb5_set_allowable_enctypes() to limit the encryption
298 * XXX Should call some function to determine the enctypes supported
299 * by the kernel. (Only need to do that once!)
303 * -1 => there was an error
307 limit_krb5_enctypes(struct rpc_gss_sec *sec, uid_t uid)
309 u_int maj_stat, min_stat;
311 gss_OID_set_desc desired_mechs;
312 krb5_enctype enctypes[] = { ENCTYPE_DES_CBC_CRC,
314 ENCTYPE_DES_CBC_MD4 };
315 int num_enctypes = sizeof(enctypes) / sizeof(enctypes[0]);
317 /* We only care about getting a krb5 cred */
318 desired_mechs.count = 1;
319 desired_mechs.elements = &krb5oid;
321 maj_stat = gss_acquire_cred(&min_stat, NULL, 0,
322 &desired_mechs, GSS_C_INITIATE,
325 if (maj_stat != GSS_S_COMPLETE) {
326 if (get_verbosity() > 0)
327 pgsserr("gss_acquire_cred",
328 maj_stat, min_stat, &krb5oid);
332 maj_stat = gss_set_allowable_enctypes(&min_stat, credh, &krb5oid,
333 num_enctypes, &enctypes);
334 if (maj_stat != GSS_S_COMPLETE) {
335 pgsserr("gss_set_allowable_enctypes",
336 maj_stat, min_stat, &krb5oid);
337 gss_release_cred(&min_stat, &credh);
344 #endif /* HAVE_SET_ALLOWABLE_ENCTYPES */
347 * Obtain credentials via a key in the keytab given
348 * a keytab handle and a gssd_k5_kt_princ structure.
349 * Checks to see if current credentials are expired,
350 * if not, uses the keytab to obtain new credentials.
353 * 0 => success (or credentials have not expired)
357 gssd_get_single_krb5_cred(krb5_context context,
359 struct gssd_k5_kt_princ *ple)
361 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
362 krb5_get_init_creds_opt *init_opts = NULL;
364 krb5_get_init_creds_opt options;
366 krb5_get_init_creds_opt *opts;
368 krb5_ccache ccache = NULL;
369 char kt_name[BUFSIZ];
370 char cc_name[BUFSIZ];
372 time_t now = time(0);
376 memset(&my_creds, 0, sizeof(my_creds));
378 if (ple->ccname && ple->endtime > now) {
379 printerr(2, "INFO: Credentials in CC '%s' are good until %d\n",
380 ple->ccname, ple->endtime);
385 if ((code = krb5_kt_get_name(context, kt, kt_name, BUFSIZ))) {
386 printerr(0, "ERROR: Unable to get keytab name in "
387 "gssd_get_single_krb5_cred\n");
391 if ((krb5_unparse_name(context, ple->princ, &pname)))
394 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
395 code = krb5_get_init_creds_opt_alloc(context, &init_opts);
397 printerr(0, "ERROR: %s allocating gic options\n",
398 gssd_k5_err_msg(context, code));
401 if (krb5_get_init_creds_opt_set_addressless(context, init_opts, 1))
402 printerr(0, "WARNING: Unable to set option for addressless "
403 "tickets. May have problems behind a NAT.\n");
404 #ifdef TEST_SHORT_LIFETIME
405 /* set a short lifetime (for debugging only!) */
406 printerr(0, "WARNING: Using (debug) short machine cred lifetime!\n");
407 krb5_get_init_creds_opt_set_tkt_life(init_opts, 5*60);
411 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS */
413 krb5_get_init_creds_opt_init(&options);
414 krb5_get_init_creds_opt_set_address_list(&options, NULL);
415 #ifdef TEST_SHORT_LIFETIME
416 /* set a short lifetime (for debugging only!) */
417 printerr(0, "WARNING: Using (debug) short machine cred lifetime!\n");
418 krb5_get_init_creds_opt_set_tkt_life(&options, 5*60);
423 if ((code = krb5_get_init_creds_keytab(context, &my_creds, ple->princ,
424 kt, 0, NULL, opts))) {
425 printerr(0, "WARNING: %s while getting initial ticket for "
426 "principal '%s' using keytab '%s'\n",
427 gssd_k5_err_msg(context, code),
428 pname ? pname : "<unparsable>", kt_name);
433 * Initialize cache file which we're going to be using
437 cache_type = "MEMORY";
440 snprintf(cc_name, sizeof(cc_name), "%s:%s/%s%s_%s",
442 ccachesearch[0], GSSD_DEFAULT_CRED_PREFIX,
443 GSSD_DEFAULT_MACHINE_CRED_SUFFIX, ple->realm);
444 ple->endtime = my_creds.times.endtime;
445 if (ple->ccname != NULL)
447 ple->ccname = strdup(cc_name);
448 if (ple->ccname == NULL) {
449 printerr(0, "ERROR: no storage to duplicate credentials "
450 "cache name '%s'\n", cc_name);
454 if ((code = krb5_cc_resolve(context, cc_name, &ccache))) {
455 printerr(0, "ERROR: %s while opening credential cache '%s'\n",
456 gssd_k5_err_msg(context, code), cc_name);
459 if ((code = krb5_cc_initialize(context, ccache, ple->princ))) {
460 printerr(0, "ERROR: %s while initializing credential "
461 "cache '%s'\n", gssd_k5_err_msg(context, code),
465 if ((code = krb5_cc_store_cred(context, ccache, &my_creds))) {
466 printerr(0, "ERROR: %s while storing credentials in '%s'\n",
467 gssd_k5_err_msg(context, code), cc_name);
472 printerr(2, "Successfully obtained machine credentials for "
473 "principal '%s' stored in ccache '%s'\n", pname, cc_name);
475 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
477 krb5_get_init_creds_opt_free(context, init_opts);
480 k5_free_unparsed_name(context, pname);
482 krb5_cc_close(context, ccache);
483 krb5_free_cred_contents(context, &my_creds);
488 * Depending on the version of Kerberos, we either need to use
489 * a private function, or simply set the environment variable.
492 gssd_set_krb5_ccache_name(char *ccname)
494 #ifdef USE_GSS_KRB5_CCACHE_NAME
495 u_int maj_stat, min_stat;
497 printerr(2, "using gss_krb5_ccache_name to select krb5 ccache %s\n",
499 maj_stat = gss_krb5_ccache_name(&min_stat, ccname, NULL);
500 if (maj_stat != GSS_S_COMPLETE) {
501 printerr(0, "WARNING: gss_krb5_ccache_name with "
502 "name '%s' failed (%s)\n",
503 ccname, error_message(min_stat));
507 * Set the KRB5CCNAME environment variable to tell the krb5 code
508 * which credentials cache to use. (Instead of using the private
509 * function above for which there is no generic gssapi
512 printerr(2, "using environment variable to select krb5 ccache %s\n",
514 setenv("KRB5CCNAME", ccname, 1);
519 * Given a principal, find a matching ple structure
521 static struct gssd_k5_kt_princ *
522 find_ple_by_princ(krb5_context context, krb5_principal princ)
524 struct gssd_k5_kt_princ *ple;
526 for (ple = gssd_k5_kt_princ_list; ple != NULL; ple = ple->next) {
527 if (krb5_principal_compare(context, ple->princ, princ))
535 * Create, initialize, and add a new ple structure to the global list
537 static struct gssd_k5_kt_princ *
538 new_ple(krb5_context context, krb5_principal princ)
540 struct gssd_k5_kt_princ *ple = NULL, *p;
541 krb5_error_code code;
543 int is_default_realm = 0;
545 ple = malloc(sizeof(struct gssd_k5_kt_princ));
548 memset(ple, 0, sizeof(*ple));
551 ple->realm = strndup(princ->realm.data,
552 princ->realm.length);
554 ple->realm = strdup(princ->realm);
556 if (ple->realm == NULL)
558 code = krb5_copy_principal(context, princ, &ple->princ);
563 * Add new entry onto the list (if this is the default
564 * realm, always add to the front of the list)
567 code = krb5_get_default_realm(context, &default_realm);
569 if (strcmp(ple->realm, default_realm) == 0)
570 is_default_realm = 1;
571 k5_free_default_realm(context, default_realm);
574 if (is_default_realm) {
575 ple->next = gssd_k5_kt_princ_list;
576 gssd_k5_kt_princ_list = ple;
578 p = gssd_k5_kt_princ_list;
579 while (p != NULL && p->next != NULL)
582 gssd_k5_kt_princ_list = ple;
598 * Given a principal, find an existing ple structure, or create one
600 static struct gssd_k5_kt_princ *
601 get_ple_by_princ(krb5_context context, krb5_principal princ)
603 struct gssd_k5_kt_princ *ple;
605 /* Need to serialize list if we ever become multi-threaded! */
607 ple = find_ple_by_princ(context, princ);
609 ple = new_ple(context, princ);
616 * Given a (possibly unqualified) hostname,
617 * return the fully qualified (lower-case!) hostname
620 get_full_hostname(const char *inhost, char *outhost, int outhostlen)
622 struct addrinfo *addrs = NULL;
623 struct addrinfo hints;
627 memset(&hints, 0, sizeof(hints));
628 hints.ai_socktype = SOCK_STREAM;
629 hints.ai_family = PF_UNSPEC;
630 hints.ai_flags = AI_CANONNAME;
632 /* Get full target hostname */
633 retval = getaddrinfo(inhost, NULL, &hints, &addrs);
635 printerr(0, "%s while getting full hostname for '%s'\n",
636 gai_strerror(retval), inhost);
639 strncpy(outhost, addrs->ai_canonname, outhostlen);
641 for (c = outhost; *c != '\0'; c++)
644 printerr(3, "Full hostname for '%s' is '%s'\n", inhost, outhost);
651 * If principal matches the given realm and service name,
652 * and has *any* instance (hostname), return 1.
653 * Otherwise return 0, indicating no match.
656 realm_and_service_match(krb5_context context, krb5_principal p,
657 const char *realm, const char *service)
660 /* Must have two components */
663 if ((strlen(realm) == p->realm.length)
664 && (strncmp(realm, p->realm.data, p->realm.length) == 0)
665 && (strlen(service) == p->data[0].length)
666 && (strncmp(service, p->data[0].data, p->data[0].length) == 0))
669 const char *name, *inst;
671 if (p->name.name_string.len != 2)
673 name = krb5_principal_get_comp_string(context, p, 0);
674 inst = krb5_principal_get_comp_string(context, p, 1);
675 if (name == NULL || inst == NULL)
677 if ((strcmp(realm, p->realm) == 0)
678 && (strcmp(service, name) == 0))
685 * Search the given keytab file looking for an entry with the given
686 * service name and realm, ignoring hostname (instance).
690 * non-zero => An error occurred
692 * If a keytab entry is found, "found" is set to one, and the keytab
693 * entry is returned in "kte". Otherwise, "found" is zero, and the
694 * value of "kte" is unpredictable.
697 gssd_search_krb5_keytab(krb5_context context, krb5_keytab kt,
698 const char *realm, const char *service,
699 int *found, krb5_keytab_entry *kte)
701 krb5_kt_cursor cursor;
702 krb5_error_code code;
703 struct gssd_k5_kt_princ *ple;
705 char kt_name[BUFSIZ];
715 * Look through each entry in the keytab file and determine
716 * if we might want to use it as machine credentials. If so,
717 * save info in the global principal list (gssd_k5_kt_princ_list).
719 if ((code = krb5_kt_get_name(context, kt, kt_name, BUFSIZ))) {
720 printerr(0, "ERROR: %s attempting to get keytab name\n",
721 gssd_k5_err_msg(context, code));
725 if ((code = krb5_kt_start_seq_get(context, kt, &cursor))) {
726 printerr(0, "ERROR: %s while beginning keytab scan "
728 gssd_k5_err_msg(context, code), kt_name);
733 while ((code = krb5_kt_next_entry(context, kt, kte, &cursor)) == 0) {
734 if ((code = krb5_unparse_name(context, kte->principal,
736 printerr(0, "WARNING: Skipping keytab entry because "
737 "we failed to unparse principal name: %s\n",
738 gssd_k5_err_msg(context, code));
739 k5_free_kt_entry(context, kte);
742 printerr(4, "Processing keytab entry for principal '%s'\n",
744 /* Use the first matching keytab entry found */
745 if ((realm_and_service_match(context, kte->principal, realm,
747 printerr(4, "We WILL use this entry (%s)\n", pname);
748 ple = get_ple_by_princ(context, kte->principal);
750 * Return, don't free, keytab entry if
751 * we were successful!
755 k5_free_kt_entry(context, kte);
760 k5_free_unparsed_name(context, pname);
764 printerr(4, "We will NOT use this entry (%s)\n",
767 k5_free_unparsed_name(context, pname);
768 k5_free_kt_entry(context, kte);
771 if ((code = krb5_kt_end_seq_get(context, kt, &cursor))) {
772 printerr(0, "WARNING: %s while ending keytab scan for "
774 gssd_k5_err_msg(context, code), kt_name);
783 * Find a keytab entry to use for a given target hostname.
784 * Tries to find the most appropriate keytab to use given the
785 * name of the host we are trying to connect with.
788 find_keytab_entry(krb5_context context, krb5_keytab kt, const char *hostname,
789 krb5_keytab_entry *kte)
791 krb5_error_code code;
792 const char *svcnames[] = { "root", "nfs", "host", NULL };
793 char **realmnames = NULL;
794 char myhostname[NI_MAXHOST], targethostname[NI_MAXHOST];
796 char *default_realm = NULL;
798 int tried_all = 0, tried_default = 0;
799 krb5_principal princ;
802 /* Get full target hostname */
803 retval = get_full_hostname(hostname, targethostname,
804 sizeof(targethostname));
808 /* Get full local hostname */
809 retval = gethostname(myhostname, sizeof(myhostname));
811 printerr(1, "%s while getting local hostname\n",
812 gssd_k5_err_msg(context, retval));
815 retval = get_full_hostname(myhostname, myhostname, sizeof(myhostname));
819 code = krb5_get_default_realm(context, &default_realm);
822 printerr(1, "%s while getting default realm name\n",
823 gssd_k5_err_msg(context, code));
828 * Get the realm name(s) for the target hostname.
829 * In reality, this function currently only returns a
830 * single realm, but we code with the assumption that
831 * someday it may actually return a list.
833 code = krb5_get_host_realm(context, targethostname, &realmnames);
835 printerr(0, "ERROR: %s while getting realm(s) for host '%s'\n",
836 gssd_k5_err_msg(context, code), targethostname);
842 * Try the "appropriate" realm first, and if nothing found for that
843 * realm, try the default realm (if it hasn't already been tried).
846 realm = realmnames[i];
851 realm = default_realm;
853 if (tried_all && tried_default)
855 if (strcmp(realm, default_realm) == 0)
857 for (j = 0; svcnames[j] != NULL; j++) {
858 code = krb5_build_principal_ext(context, &princ,
867 printerr(1, "%s while building principal for "
869 gssd_k5_err_msg(context, code),
870 svcnames[j], myhostname, realm);
873 code = krb5_kt_get_entry(context, kt, princ, 0, 0, kte);
874 krb5_free_principal(context, princ);
876 printerr(3, "%s while getting keytab entry for "
878 gssd_k5_err_msg(context, code),
879 svcnames[j], myhostname, realm);
881 printerr(3, "Success getting keytab entry for "
883 svcnames[j], myhostname, realm);
890 * Nothing found with our hostname instance, now look for
891 * names with any instance (they must have an instance)
893 for (j = 0; svcnames[j] != NULL; j++) {
895 code = gssd_search_krb5_keytab(context, kt, realm,
896 svcnames[j], &found, kte);
897 if (!code && found) {
898 printerr(3, "Success getting keytab entry for "
899 "%s/*@%s\n", svcnames[j], realm);
906 realm = realmnames[i];
911 k5_free_default_realm(context, default_realm);
913 krb5_free_host_realm(context, realmnames);
918 static inline int data_is_equal(krb5_data d1, krb5_data d2)
920 return (d1.length == d2.length
921 && memcmp(d1.data, d2.data, d1.length) == 0);
925 check_for_tgt(krb5_context context, krb5_ccache ccache,
926 krb5_principal principal)
933 ret = krb5_cc_start_seq_get(context, ccache, &cur);
938 (ret = krb5_cc_next_cred(context, ccache, &cur, &creds)) == 0) {
939 if (creds.server->length == 2 &&
940 data_is_equal(creds.server->realm,
942 creds.server->data[0].length == 6 &&
943 memcmp(creds.server->data[0].data,
945 data_is_equal(creds.server->data[1],
947 creds.times.endtime > time(NULL))
949 krb5_free_cred_contents(context, &creds);
951 krb5_cc_end_seq_get(context, ccache, &cur);
957 query_krb5_ccache(const char* cred_cache, char **ret_princname,
961 krb5_context context;
963 krb5_principal principal;
968 ret = krb5_init_context(&context);
972 if(!cred_cache || krb5_cc_resolve(context, cred_cache, &ccache))
975 if (krb5_cc_set_flags(context, ccache, 0))
978 ret = krb5_cc_get_principal(context, ccache, &principal);
982 found = check_for_tgt(context, ccache, principal);
984 ret = krb5_unparse_name(context, principal, &princstring);
986 if ((str = strchr(princstring, '@')) != NULL) {
988 *ret_princname = strdup(princstring);
989 *ret_realm = strdup(str+1);
991 k5_free_unparsed_name(context, princstring);
996 krb5_free_principal(context, principal);
998 krb5_cc_set_flags(context, ccache, KRB5_TC_OPENCLOSE);
999 krb5_cc_close(context, ccache);
1001 krb5_free_context(context);
1005 /*==========================*/
1006 /*=== External routines ===*/
1007 /*==========================*/
1010 * Attempt to find the best match for a credentials cache file
1011 * given only a UID. We really need more information, but we
1012 * do the best we can.
1015 * 0 => a ccache was found
1016 * 1 => no ccache was found
1019 gssd_setup_krb5_user_gss_ccache(uid_t uid, char *servername, char *dirname)
1021 char buf[MAX_NETOBJ_SZ];
1024 printerr(2, "getting credentials for client with uid %u for "
1025 "server %s\n", uid, servername);
1026 memset(buf, 0, sizeof(buf));
1027 if (gssd_find_existing_krb5_ccache(uid, dirname, &d)) {
1028 snprintf(buf, sizeof(buf), "FILE:%s/%s", dirname, d->d_name);
1033 printerr(2, "using %s as credentials cache for client with "
1034 "uid %u for server %s\n", buf, uid, servername);
1035 gssd_set_krb5_ccache_name(buf);
1040 * Let the gss code know where to find the machine credentials ccache.
1046 gssd_setup_krb5_machine_gss_ccache(char *ccname)
1048 printerr(2, "using %s as credentials cache for machine creds\n",
1050 gssd_set_krb5_ccache_name(ccname);
1054 * Return an array of pointers to names of credential cache files
1055 * which can be used to try to create gss contexts with a server.
1058 * 0 => list is attached
1062 gssd_get_krb5_machine_cred_list(char ***list)
1066 int listsize = listinc;
1069 struct gssd_k5_kt_princ *ple;
1071 /* Assume failure */
1073 *list = (char **) NULL;
1075 if ((l = (char **) malloc(listsize * sizeof(char *))) == NULL) {
1080 /* Need to serialize list if we ever become multi-threaded! */
1082 for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
1084 /* Make sure cred is up-to-date before returning it */
1085 retval = gssd_refresh_krb5_machine_credential(NULL, ple);
1088 if (i + 1 > listsize) {
1089 listsize += listinc;
1091 realloc(l, listsize * sizeof(char *));
1097 if ((l[i++] = strdup(ple->ccname)) == NULL) {
1114 * Frees the list of names returned in get_krb5_machine_cred_list()
1117 gssd_free_krb5_machine_cred_list(char **list)
1123 for (n = list; n && *n; n++) {
1130 * Called upon exit. Destroys machine credentials.
1133 gssd_destroy_krb5_machine_creds(void)
1135 krb5_context context;
1136 krb5_error_code code = 0;
1138 struct gssd_k5_kt_princ *ple;
1140 code = krb5_init_context(&context);
1142 printerr(0, "ERROR: %s while initializing krb5\n",
1143 gssd_k5_err_msg(NULL, code));
1147 for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
1150 if ((code = krb5_cc_resolve(context, ple->ccname, &ccache))) {
1151 printerr(0, "WARNING: %s while resolving credential "
1152 "cache '%s' for destruction\n",
1153 gssd_k5_err_msg(context, code), ple->ccname);
1157 if ((code = krb5_cc_destroy(context, ccache))) {
1158 printerr(0, "WARNING: %s while destroying credential "
1160 gssd_k5_err_msg(context, code), ple->ccname);
1164 krb5_free_context(context);
1168 * Obtain (or refresh if necessary) Kerberos machine credentials
1171 gssd_refresh_krb5_machine_credential(char *hostname,
1172 struct gssd_k5_kt_princ *ple)
1174 krb5_error_code code = 0;
1175 krb5_context context;
1176 krb5_keytab kt = NULL;;
1179 if (hostname == NULL && ple == NULL)
1182 code = krb5_init_context(&context);
1184 printerr(0, "ERROR: %s: %s while initializing krb5 context\n",
1185 __FUNCTION__, gssd_k5_err_msg(NULL, code));
1190 if ((code = krb5_kt_resolve(context, keytabfile, &kt))) {
1191 printerr(0, "ERROR: %s: %s while resolving keytab '%s'\n",
1192 __FUNCTION__, gssd_k5_err_msg(context, code),
1198 krb5_keytab_entry kte;
1200 code = find_keytab_entry(context, kt, hostname, &kte);
1202 printerr(0, "ERROR: %s: no usable keytab entry found "
1203 "in keytab %s for connection with host %s\n",
1204 __FUNCTION__, keytabfile, hostname);
1209 ple = get_ple_by_princ(context, kte.principal);
1210 k5_free_kt_entry(context, &kte);
1213 if ((krb5_unparse_name(context, kte.principal, &pname))) {
1216 printerr(0, "ERROR: %s: Could not locate or create "
1217 "ple struct for principal %s for connection "
1219 __FUNCTION__, pname ? pname : "<unparsable>",
1221 if (pname) k5_free_unparsed_name(context, pname);
1225 retval = gssd_get_single_krb5_cred(context, kt, ple);
1228 krb5_kt_close(context, kt);
1229 krb5_free_context(context);
1234 * A common routine for getting the Kerberos error message
1237 gssd_k5_err_msg(krb5_context context, krb5_error_code code)
1239 const char *msg = NULL;
1240 #if HAVE_KRB5_GET_ERROR_MESSAGE
1241 if (context != NULL)
1242 msg = krb5_get_error_message(context, code);
1247 return error_message(code);
1249 if (context != NULL)
1250 return krb5_get_err_text(context, code);
1252 return error_message(code);
1257 * Return default Kerberos realm
1260 gssd_k5_get_default_realm(char **def_realm)
1262 krb5_context context;
1264 if (krb5_init_context(&context))
1267 krb5_get_default_realm(context, def_realm);
1269 krb5_free_context(context);