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, struct dirent **d);
135 static int gssd_get_single_krb5_cred(krb5_context context,
136 krb5_keytab kt, struct gssd_k5_kt_princ *ple);
140 * Called from the scandir function to weed out potential krb5
141 * credentials cache files
144 * 0 => don't select this one
145 * 1 => select this one
148 select_krb5_ccache(const struct dirent *d)
151 * Note: We used to check d->d_type for DT_REG here,
152 * but apparenlty reiser4 always has DT_UNKNOWN.
153 * Check for IS_REG after stat() call instead.
155 if (strstr(d->d_name, GSSD_DEFAULT_CRED_PREFIX))
162 * Look in the ccachedir for files that look like they
163 * are Kerberos Credential Cache files for a given UID. Return
164 * non-zero and the dirent pointer for the entry most likely to be
165 * what we want. Otherwise, return zero and no dirent pointer.
166 * The caller is responsible for freeing the dirent if one is returned.
169 * 0 => could not find an existing entry
170 * 1 => found an existing entry
173 gssd_find_existing_krb5_ccache(uid_t uid, struct dirent **d)
175 struct dirent **namelist;
179 struct dirent *best_match_dir = NULL;
180 struct stat best_match_stat, tmp_stat;
182 memset(&best_match_stat, 0, sizeof(best_match_stat));
184 n = scandir(ccachedir, &namelist, select_krb5_ccache, 0);
186 perror("scandir looking for krb5 credentials caches");
190 for (i = 0; i < n; i++) {
191 printerr(3, "CC file '%s' being considered\n",
192 namelist[i]->d_name);
193 snprintf(statname, sizeof(statname),
194 "%s/%s", ccachedir, namelist[i]->d_name);
195 if (lstat(statname, &tmp_stat)) {
196 printerr(0, "Error doing stat on file '%s'\n",
201 /* Only pick caches owned by the user (uid) */
202 if (tmp_stat.st_uid != uid) {
203 printerr(3, "'%s' owned by %u, not %u\n",
204 statname, tmp_stat.st_uid, uid);
208 if (!S_ISREG(tmp_stat.st_mode)) {
209 printerr(3, "'%s' is not a regular file\n",
214 printerr(3, "CC file '%s' matches owner check and has "
216 namelist[i]->d_name, tmp_stat.st_mtime);
218 * if more than one match is found, return the most
219 * recent (the one with the latest mtime), and
220 * don't free the dirent
223 best_match_dir = namelist[i];
224 best_match_stat = tmp_stat;
229 * If the current match has an mtime later
230 * than the one we are looking at, then use
231 * the current match. Otherwise, we still
232 * have the best match.
234 if (tmp_stat.st_mtime >
235 best_match_stat.st_mtime) {
236 free(best_match_dir);
237 best_match_dir = namelist[i];
238 best_match_stat = tmp_stat;
243 printerr(3, "CC file '%s' is our "
244 "current best match "
245 "with mtime of %u\n",
246 best_match_dir->d_name,
247 best_match_stat.st_mtime);
260 #ifdef HAVE_SET_ALLOWABLE_ENCTYPES
262 * this routine obtains a credentials handle via gss_acquire_cred()
263 * then calls gss_krb5_set_allowable_enctypes() to limit the encryption
266 * XXX Should call some function to determine the enctypes supported
267 * by the kernel. (Only need to do that once!)
271 * -1 => there was an error
275 limit_krb5_enctypes(struct rpc_gss_sec *sec, uid_t uid)
277 u_int maj_stat, min_stat;
279 gss_OID_set_desc desired_mechs;
280 krb5_enctype enctypes[] = { ENCTYPE_DES_CBC_CRC };
281 int num_enctypes = sizeof(enctypes) / sizeof(enctypes[0]);
283 /* We only care about getting a krb5 cred */
284 desired_mechs.count = 1;
285 desired_mechs.elements = &krb5oid;
287 maj_stat = gss_acquire_cred(&min_stat, NULL, 0,
288 &desired_mechs, GSS_C_INITIATE,
291 if (maj_stat != GSS_S_COMPLETE) {
292 pgsserr("gss_acquire_cred",
293 maj_stat, min_stat, &krb5oid);
297 maj_stat = gss_set_allowable_enctypes(&min_stat, credh, &krb5oid,
298 num_enctypes, &enctypes);
299 if (maj_stat != GSS_S_COMPLETE) {
300 pgsserr("gss_set_allowable_enctypes",
301 maj_stat, min_stat, &krb5oid);
302 gss_release_cred(&min_stat, &credh);
309 #endif /* HAVE_SET_ALLOWABLE_ENCTYPES */
312 * Obtain credentials via a key in the keytab given
313 * a keytab handle and a gssd_k5_kt_princ structure.
314 * Checks to see if current credentials are expired,
315 * if not, uses the keytab to obtain new credentials.
318 * 0 => success (or credentials have not expired)
322 gssd_get_single_krb5_cred(krb5_context context,
324 struct gssd_k5_kt_princ *ple)
326 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
327 krb5_get_init_creds_opt *init_opts = NULL;
329 krb5_get_init_creds_opt options;
331 krb5_get_init_creds_opt *opts;
333 krb5_ccache ccache = NULL;
334 char kt_name[BUFSIZ];
335 char cc_name[BUFSIZ];
337 time_t now = time(0);
341 memset(&my_creds, 0, sizeof(my_creds));
343 if (ple->ccname && ple->endtime > now) {
344 printerr(2, "INFO: Credentials in CC '%s' are good until %d\n",
345 ple->ccname, ple->endtime);
350 if ((code = krb5_kt_get_name(context, kt, kt_name, BUFSIZ))) {
351 printerr(0, "ERROR: Unable to get keytab name in "
352 "gssd_get_single_krb5_cred\n");
356 if ((krb5_unparse_name(context, ple->princ, &pname)))
359 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
360 code = krb5_get_init_creds_opt_alloc(context, &init_opts);
362 printerr(0, "ERROR: %s allocating gic options\n",
363 gssd_k5_err_msg(context, code));
366 if (krb5_get_init_creds_opt_set_addressless(context, init_opts, 1))
367 printerr(0, "WARNING: Unable to set option for addressless "
368 "tickets. May have problems behind a NAT.\n");
369 #ifdef TEST_SHORT_LIFETIME
370 /* set a short lifetime (for debugging only!) */
371 printerr(0, "WARNING: Using (debug) short machine cred lifetime!\n");
372 krb5_get_init_creds_opt_set_tkt_life(init_opts, 5*60);
376 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS */
378 krb5_get_init_creds_opt_init(&options);
379 krb5_get_init_creds_opt_set_address_list(&options, NULL);
380 #ifdef TEST_SHORT_LIFETIME
381 /* set a short lifetime (for debugging only!) */
382 printerr(0, "WARNING: Using (debug) short machine cred lifetime!\n");
383 krb5_get_init_creds_opt_set_tkt_life(&options, 5*60);
388 if ((code = krb5_get_init_creds_keytab(context, &my_creds, ple->princ,
389 kt, 0, NULL, opts))) {
390 printerr(0, "WARNING: %s while getting initial ticket for "
391 "principal '%s' using keytab '%s'\n",
392 gssd_k5_err_msg(context, code),
393 pname ? pname : "<unparsable>", kt_name);
398 * Initialize cache file which we're going to be using
402 cache_type = "MEMORY";
405 snprintf(cc_name, sizeof(cc_name), "%s:%s/%s%s_%s",
407 GSSD_DEFAULT_CRED_DIR, GSSD_DEFAULT_CRED_PREFIX,
408 GSSD_DEFAULT_MACHINE_CRED_SUFFIX, ple->realm);
409 ple->endtime = my_creds.times.endtime;
410 if (ple->ccname != NULL)
412 ple->ccname = strdup(cc_name);
413 if (ple->ccname == NULL) {
414 printerr(0, "ERROR: no storage to duplicate credentials "
415 "cache name '%s'\n", cc_name);
419 if ((code = krb5_cc_resolve(context, cc_name, &ccache))) {
420 printerr(0, "ERROR: %s while opening credential cache '%s'\n",
421 gssd_k5_err_msg(context, code), cc_name);
424 if ((code = krb5_cc_initialize(context, ccache, ple->princ))) {
425 printerr(0, "ERROR: %s while initializing credential "
426 "cache '%s'\n", gssd_k5_err_msg(context, code),
430 if ((code = krb5_cc_store_cred(context, ccache, &my_creds))) {
431 printerr(0, "ERROR: %s while storing credentials in '%s'\n",
432 gssd_k5_err_msg(context, code), cc_name);
437 printerr(2, "Successfully obtained machine credentials for "
438 "principal '%s' stored in ccache '%s'\n", pname, cc_name);
440 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
442 krb5_get_init_creds_opt_free(context, init_opts);
445 k5_free_unparsed_name(context, pname);
447 krb5_cc_close(context, ccache);
448 krb5_free_cred_contents(context, &my_creds);
453 * Depending on the version of Kerberos, we either need to use
454 * a private function, or simply set the environment variable.
457 gssd_set_krb5_ccache_name(char *ccname)
459 #ifdef USE_GSS_KRB5_CCACHE_NAME
460 u_int maj_stat, min_stat;
462 printerr(2, "using gss_krb5_ccache_name to select krb5 ccache %s\n",
464 maj_stat = gss_krb5_ccache_name(&min_stat, ccname, NULL);
465 if (maj_stat != GSS_S_COMPLETE) {
466 printerr(0, "WARNING: gss_krb5_ccache_name with "
467 "name '%s' failed (%s)\n",
468 ccname, error_message(min_stat));
472 * Set the KRB5CCNAME environment variable to tell the krb5 code
473 * which credentials cache to use. (Instead of using the private
474 * function above for which there is no generic gssapi
477 printerr(2, "using environment variable to select krb5 ccache %s\n",
479 setenv("KRB5CCNAME", ccname, 1);
484 * Given a principal, find a matching ple structure
486 static struct gssd_k5_kt_princ *
487 find_ple_by_princ(krb5_context context, krb5_principal princ)
489 struct gssd_k5_kt_princ *ple;
491 for (ple = gssd_k5_kt_princ_list; ple != NULL; ple = ple->next) {
492 if (krb5_principal_compare(context, ple->princ, princ))
500 * Create, initialize, and add a new ple structure to the global list
502 static struct gssd_k5_kt_princ *
503 new_ple(krb5_context context, krb5_principal princ)
505 struct gssd_k5_kt_princ *ple = NULL, *p;
506 krb5_error_code code;
508 int is_default_realm = 0;
510 ple = malloc(sizeof(struct gssd_k5_kt_princ));
513 memset(ple, 0, sizeof(*ple));
516 ple->realm = strndup(princ->realm.data,
517 princ->realm.length);
519 ple->realm = strdup(princ->realm);
521 if (ple->realm == NULL)
523 code = krb5_copy_principal(context, princ, &ple->princ);
528 * Add new entry onto the list (if this is the default
529 * realm, always add to the front of the list)
532 code = krb5_get_default_realm(context, &default_realm);
534 if (strcmp(ple->realm, default_realm) == 0)
535 is_default_realm = 1;
536 k5_free_default_realm(context, default_realm);
539 if (is_default_realm) {
540 ple->next = gssd_k5_kt_princ_list;
541 gssd_k5_kt_princ_list = ple;
543 p = gssd_k5_kt_princ_list;
544 while (p != NULL && p->next != NULL)
547 gssd_k5_kt_princ_list = ple;
563 * Given a principal, find an existing ple structure, or create one
565 static struct gssd_k5_kt_princ *
566 get_ple_by_princ(krb5_context context, krb5_principal princ)
568 struct gssd_k5_kt_princ *ple;
570 /* Need to serialize list if we ever become multi-threaded! */
572 ple = find_ple_by_princ(context, princ);
574 ple = new_ple(context, princ);
581 * Given a (possibly unqualified) hostname,
582 * return the fully qualified (lower-case!) hostname
585 get_full_hostname(const char *inhost, char *outhost, int outhostlen)
587 struct addrinfo *addrs = NULL;
588 struct addrinfo hints;
592 memset(&hints, 0, sizeof(hints));
593 hints.ai_socktype = SOCK_STREAM;
594 hints.ai_family = PF_UNSPEC;
595 hints.ai_flags = AI_CANONNAME;
597 /* Get full target hostname */
598 retval = getaddrinfo(inhost, NULL, &hints, &addrs);
600 printerr(0, "%s while getting full hostname for '%s'\n",
601 gai_strerror(retval), inhost);
604 strncpy(outhost, addrs->ai_canonname, outhostlen);
606 for (c = outhost; *c != '\0'; c++)
609 printerr(3, "Full hostname for '%s' is '%s'\n", inhost, outhost);
616 * If principal matches the given realm and service name,
617 * and has *any* instance (hostname), return 1.
618 * Otherwise return 0, indicating no match.
621 realm_and_service_match(krb5_context context, krb5_principal p,
622 const char *realm, const char *service)
625 /* Must have two components */
628 if ((strlen(realm) == p->realm.length)
629 && (strncmp(realm, p->realm.data, p->realm.length) == 0)
630 && (strlen(service) == p->data[0].length)
631 && (strncmp(service, p->data[0].data, p->data[0].length) == 0))
634 const char *name, *inst;
636 if (p->name.name_string.len != 2)
638 name = krb5_principal_get_comp_string(context, p, 0);
639 inst = krb5_principal_get_comp_string(context, p, 1);
640 if (name == NULL || inst == NULL)
642 if ((strcmp(realm, p->realm) == 0)
643 && (strcmp(service, name) == 0))
650 * Search the given keytab file looking for an entry with the given
651 * service name and realm, ignoring hostname (instance).
655 * non-zero => An error occurred
657 * If a keytab entry is found, "found" is set to one, and the keytab
658 * entry is returned in "kte". Otherwise, "found" is zero, and the
659 * value of "kte" is unpredictable.
662 gssd_search_krb5_keytab(krb5_context context, krb5_keytab kt,
663 const char *realm, const char *service,
664 int *found, krb5_keytab_entry *kte)
666 krb5_kt_cursor cursor;
667 krb5_error_code code;
668 struct gssd_k5_kt_princ *ple;
670 char kt_name[BUFSIZ];
680 * Look through each entry in the keytab file and determine
681 * if we might want to use it as machine credentials. If so,
682 * save info in the global principal list (gssd_k5_kt_princ_list).
684 if ((code = krb5_kt_get_name(context, kt, kt_name, BUFSIZ))) {
685 printerr(0, "ERROR: %s attempting to get keytab name\n",
686 gssd_k5_err_msg(context, code));
690 if ((code = krb5_kt_start_seq_get(context, kt, &cursor))) {
691 printerr(0, "ERROR: %s while beginning keytab scan "
693 gssd_k5_err_msg(context, code), kt_name);
698 while ((code = krb5_kt_next_entry(context, kt, kte, &cursor)) == 0) {
699 if ((code = krb5_unparse_name(context, kte->principal,
701 printerr(0, "WARNING: Skipping keytab entry because "
702 "we failed to unparse principal name: %s\n",
703 gssd_k5_err_msg(context, code));
704 k5_free_kt_entry(context, kte);
707 printerr(4, "Processing keytab entry for principal '%s'\n",
709 /* Use the first matching keytab entry found */
710 if ((realm_and_service_match(context, kte->principal, realm,
712 printerr(4, "We WILL use this entry (%s)\n", pname);
713 ple = get_ple_by_princ(context, kte->principal);
715 * Return, don't free, keytab entry if
716 * we were successful!
720 k5_free_kt_entry(context, kte);
725 k5_free_unparsed_name(context, pname);
729 printerr(4, "We will NOT use this entry (%s)\n",
732 k5_free_unparsed_name(context, pname);
733 k5_free_kt_entry(context, kte);
736 if ((code = krb5_kt_end_seq_get(context, kt, &cursor))) {
737 printerr(0, "WARNING: %s while ending keytab scan for "
739 gssd_k5_err_msg(context, code), kt_name);
748 * Find a keytab entry to use for a given target hostname.
749 * Tries to find the most appropriate keytab to use given the
750 * name of the host we are trying to connect with.
753 find_keytab_entry(krb5_context context, krb5_keytab kt, const char *hostname,
754 krb5_keytab_entry *kte)
756 krb5_error_code code;
757 const char *svcnames[] = { "root", "nfs", "host", NULL };
758 char **realmnames = NULL;
759 char myhostname[NI_MAXHOST], targethostname[NI_MAXHOST];
761 char *default_realm = NULL;
763 int tried_all = 0, tried_default = 0;
764 krb5_principal princ;
767 /* Get full target hostname */
768 retval = get_full_hostname(hostname, targethostname,
769 sizeof(targethostname));
773 /* Get full local hostname */
774 retval = gethostname(myhostname, sizeof(myhostname));
776 printerr(1, "%s while getting local hostname\n",
777 gssd_k5_err_msg(context, retval));
780 retval = get_full_hostname(myhostname, myhostname, sizeof(myhostname));
784 code = krb5_get_default_realm(context, &default_realm);
787 printerr(1, "%s while getting default realm name\n",
788 gssd_k5_err_msg(context, code));
793 * Get the realm name(s) for the target hostname.
794 * In reality, this function currently only returns a
795 * single realm, but we code with the assumption that
796 * someday it may actually return a list.
798 code = krb5_get_host_realm(context, targethostname, &realmnames);
800 printerr(0, "ERROR: %s while getting realm(s) for host '%s'\n",
801 gssd_k5_err_msg(context, code), targethostname);
807 * Try the "appropriate" realm first, and if nothing found for that
808 * realm, try the default realm (if it hasn't already been tried).
811 realm = realmnames[i];
816 realm = default_realm;
818 if (tried_all && tried_default)
820 if (strcmp(realm, default_realm) == 0)
822 for (j = 0; svcnames[j] != NULL; j++) {
823 code = krb5_build_principal_ext(context, &princ,
832 printerr(1, "%s while building principal for "
834 gssd_k5_err_msg(context, code),
835 svcnames[j], myhostname, realm);
838 code = krb5_kt_get_entry(context, kt, princ, 0, 0, kte);
839 krb5_free_principal(context, princ);
841 printerr(3, "%s while getting keytab entry for "
843 gssd_k5_err_msg(context, code),
844 svcnames[j], myhostname, realm);
846 printerr(3, "Success getting keytab entry for "
848 svcnames[j], myhostname, realm);
855 * Nothing found with our hostname instance, now look for
856 * names with any instance (they must have an instance)
858 for (j = 0; svcnames[j] != NULL; j++) {
860 code = gssd_search_krb5_keytab(context, kt, realm,
861 svcnames[j], &found, kte);
862 if (!code && found) {
863 printerr(3, "Success getting keytab entry for "
864 "%s/*@%s\n", svcnames[j], realm);
871 realm = realmnames[i];
876 k5_free_default_realm(context, default_realm);
878 krb5_free_host_realm(context, realmnames);
882 /*==========================*/
883 /*=== External routines ===*/
884 /*==========================*/
887 * Attempt to find the best match for a credentials cache file
888 * given only a UID. We really need more information, but we
889 * do the best we can.
895 gssd_setup_krb5_user_gss_ccache(uid_t uid, char *servername)
897 char buf[MAX_NETOBJ_SZ];
900 printerr(2, "getting credentials for client with uid %u for "
901 "server %s\n", uid, servername);
902 memset(buf, 0, sizeof(buf));
903 if (gssd_find_existing_krb5_ccache(uid, &d)) {
904 snprintf(buf, sizeof(buf), "FILE:%s/%s",
905 ccachedir, d->d_name);
909 snprintf(buf, sizeof(buf), "FILE:%s/%s%u",
910 ccachedir, GSSD_DEFAULT_CRED_PREFIX, uid);
911 printerr(2, "using %s as credentials cache for client with "
912 "uid %u for server %s\n", buf, uid, servername);
913 gssd_set_krb5_ccache_name(buf);
917 * Let the gss code know where to find the machine credentials ccache.
923 gssd_setup_krb5_machine_gss_ccache(char *ccname)
925 printerr(2, "using %s as credentials cache for machine creds\n",
927 gssd_set_krb5_ccache_name(ccname);
931 * Return an array of pointers to names of credential cache files
932 * which can be used to try to create gss contexts with a server.
935 * 0 => list is attached
939 gssd_get_krb5_machine_cred_list(char ***list)
943 int listsize = listinc;
946 struct gssd_k5_kt_princ *ple;
950 *list = (char **) NULL;
952 if ((l = (char **) malloc(listsize * sizeof(char *))) == NULL) {
957 /* Need to serialize list if we ever become multi-threaded! */
959 for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
961 /* Make sure cred is up-to-date before returning it */
962 retval = gssd_refresh_krb5_machine_credential(NULL, ple);
965 if (i + 1 > listsize) {
968 realloc(l, listsize * sizeof(char *));
974 if ((l[i++] = strdup(ple->ccname)) == NULL) {
991 * Frees the list of names returned in get_krb5_machine_cred_list()
994 gssd_free_krb5_machine_cred_list(char **list)
1000 for (n = list; n && *n; n++) {
1007 * Called upon exit. Destroys machine credentials.
1010 gssd_destroy_krb5_machine_creds(void)
1012 krb5_context context;
1013 krb5_error_code code = 0;
1015 struct gssd_k5_kt_princ *ple;
1017 code = krb5_init_context(&context);
1019 printerr(0, "ERROR: %s while initializing krb5\n",
1020 gssd_k5_err_msg(NULL, code));
1024 for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
1027 if ((code = krb5_cc_resolve(context, ple->ccname, &ccache))) {
1028 printerr(0, "WARNING: %s while resolving credential "
1029 "cache '%s' for destruction\n",
1030 gssd_k5_err_msg(context, code), ple->ccname);
1034 if ((code = krb5_cc_destroy(context, ccache))) {
1035 printerr(0, "WARNING: %s while destroying credential "
1037 gssd_k5_err_msg(context, code), ple->ccname);
1041 krb5_free_context(context);
1045 * Obtain (or refresh if necessary) Kerberos machine credentials
1048 gssd_refresh_krb5_machine_credential(char *hostname,
1049 struct gssd_k5_kt_princ *ple)
1051 krb5_error_code code = 0;
1052 krb5_context context;
1053 krb5_keytab kt = NULL;;
1056 if (hostname == NULL && ple == NULL)
1059 code = krb5_init_context(&context);
1061 printerr(0, "ERROR: %s: %s while initializing krb5 context\n",
1062 __FUNCTION__, gssd_k5_err_msg(NULL, code));
1067 if ((code = krb5_kt_resolve(context, keytabfile, &kt))) {
1068 printerr(0, "ERROR: %s: %s while resolving keytab '%s'\n",
1069 __FUNCTION__, gssd_k5_err_msg(context, code),
1075 krb5_keytab_entry kte;
1077 code = find_keytab_entry(context, kt, hostname, &kte);
1079 printerr(0, "ERROR: %s: no usable keytab entry found "
1080 "in keytab %s for connection with host %s\n",
1081 __FUNCTION__, keytabfile, hostname);
1086 ple = get_ple_by_princ(context, kte.principal);
1087 k5_free_kt_entry(context, &kte);
1090 if ((krb5_unparse_name(context, kte.principal, &pname))) {
1093 printerr(0, "ERROR: %s: Could not locate or create "
1094 "ple struct for principal %s for connection "
1096 __FUNCTION__, pname ? pname : "<unparsable>",
1098 if (pname) k5_free_unparsed_name(context, pname);
1102 retval = gssd_get_single_krb5_cred(context, kt, ple);
1105 krb5_kt_close(context, kt);
1106 krb5_free_context(context);
1111 * A common routine for getting the Kerberos error message
1114 gssd_k5_err_msg(krb5_context context, krb5_error_code code)
1116 const char *msg = NULL;
1117 #if HAVE_KRB5_GET_ERROR_MESSAGE
1118 if (context != NULL)
1119 msg = krb5_get_error_message(context, code);
1124 return error_message(code);
1126 if (context != NULL)
1127 return krb5_get_err_text(context, code);
1129 return error_message(code);