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,
282 ENCTYPE_DES_CBC_MD4 };
283 int num_enctypes = sizeof(enctypes) / sizeof(enctypes[0]);
285 /* We only care about getting a krb5 cred */
286 desired_mechs.count = 1;
287 desired_mechs.elements = &krb5oid;
289 maj_stat = gss_acquire_cred(&min_stat, NULL, 0,
290 &desired_mechs, GSS_C_INITIATE,
293 if (maj_stat != GSS_S_COMPLETE) {
294 pgsserr("gss_acquire_cred",
295 maj_stat, min_stat, &krb5oid);
299 maj_stat = gss_set_allowable_enctypes(&min_stat, credh, &krb5oid,
300 num_enctypes, &enctypes);
301 if (maj_stat != GSS_S_COMPLETE) {
302 pgsserr("gss_set_allowable_enctypes",
303 maj_stat, min_stat, &krb5oid);
304 gss_release_cred(&min_stat, &credh);
311 #endif /* HAVE_SET_ALLOWABLE_ENCTYPES */
314 * Obtain credentials via a key in the keytab given
315 * a keytab handle and a gssd_k5_kt_princ structure.
316 * Checks to see if current credentials are expired,
317 * if not, uses the keytab to obtain new credentials.
320 * 0 => success (or credentials have not expired)
324 gssd_get_single_krb5_cred(krb5_context context,
326 struct gssd_k5_kt_princ *ple)
328 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
329 krb5_get_init_creds_opt *init_opts = NULL;
331 krb5_get_init_creds_opt options;
333 krb5_get_init_creds_opt *opts;
335 krb5_ccache ccache = NULL;
336 char kt_name[BUFSIZ];
337 char cc_name[BUFSIZ];
339 time_t now = time(0);
343 memset(&my_creds, 0, sizeof(my_creds));
345 if (ple->ccname && ple->endtime > now) {
346 printerr(2, "INFO: Credentials in CC '%s' are good until %d\n",
347 ple->ccname, ple->endtime);
352 if ((code = krb5_kt_get_name(context, kt, kt_name, BUFSIZ))) {
353 printerr(0, "ERROR: Unable to get keytab name in "
354 "gssd_get_single_krb5_cred\n");
358 if ((krb5_unparse_name(context, ple->princ, &pname)))
361 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
362 code = krb5_get_init_creds_opt_alloc(context, &init_opts);
364 printerr(0, "ERROR: %s allocating gic options\n",
365 gssd_k5_err_msg(context, code));
368 if (krb5_get_init_creds_opt_set_addressless(context, init_opts, 1))
369 printerr(0, "WARNING: Unable to set option for addressless "
370 "tickets. May have problems behind a NAT.\n");
371 #ifdef TEST_SHORT_LIFETIME
372 /* set a short lifetime (for debugging only!) */
373 printerr(0, "WARNING: Using (debug) short machine cred lifetime!\n");
374 krb5_get_init_creds_opt_set_tkt_life(init_opts, 5*60);
378 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS */
380 krb5_get_init_creds_opt_init(&options);
381 krb5_get_init_creds_opt_set_address_list(&options, NULL);
382 #ifdef TEST_SHORT_LIFETIME
383 /* set a short lifetime (for debugging only!) */
384 printerr(0, "WARNING: Using (debug) short machine cred lifetime!\n");
385 krb5_get_init_creds_opt_set_tkt_life(&options, 5*60);
390 if ((code = krb5_get_init_creds_keytab(context, &my_creds, ple->princ,
391 kt, 0, NULL, opts))) {
392 printerr(0, "WARNING: %s while getting initial ticket for "
393 "principal '%s' using keytab '%s'\n",
394 gssd_k5_err_msg(context, code),
395 pname ? pname : "<unparsable>", kt_name);
400 * Initialize cache file which we're going to be using
404 cache_type = "MEMORY";
407 snprintf(cc_name, sizeof(cc_name), "%s:%s/%s%s_%s",
409 ccachedir, GSSD_DEFAULT_CRED_PREFIX,
410 GSSD_DEFAULT_MACHINE_CRED_SUFFIX, ple->realm);
411 ple->endtime = my_creds.times.endtime;
412 if (ple->ccname != NULL)
414 ple->ccname = strdup(cc_name);
415 if (ple->ccname == NULL) {
416 printerr(0, "ERROR: no storage to duplicate credentials "
417 "cache name '%s'\n", cc_name);
421 if ((code = krb5_cc_resolve(context, cc_name, &ccache))) {
422 printerr(0, "ERROR: %s while opening credential cache '%s'\n",
423 gssd_k5_err_msg(context, code), cc_name);
426 if ((code = krb5_cc_initialize(context, ccache, ple->princ))) {
427 printerr(0, "ERROR: %s while initializing credential "
428 "cache '%s'\n", gssd_k5_err_msg(context, code),
432 if ((code = krb5_cc_store_cred(context, ccache, &my_creds))) {
433 printerr(0, "ERROR: %s while storing credentials in '%s'\n",
434 gssd_k5_err_msg(context, code), cc_name);
439 printerr(2, "Successfully obtained machine credentials for "
440 "principal '%s' stored in ccache '%s'\n", pname, cc_name);
442 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
444 krb5_get_init_creds_opt_free(context, init_opts);
447 k5_free_unparsed_name(context, pname);
449 krb5_cc_close(context, ccache);
450 krb5_free_cred_contents(context, &my_creds);
455 * Depending on the version of Kerberos, we either need to use
456 * a private function, or simply set the environment variable.
459 gssd_set_krb5_ccache_name(char *ccname)
461 #ifdef USE_GSS_KRB5_CCACHE_NAME
462 u_int maj_stat, min_stat;
464 printerr(2, "using gss_krb5_ccache_name to select krb5 ccache %s\n",
466 maj_stat = gss_krb5_ccache_name(&min_stat, ccname, NULL);
467 if (maj_stat != GSS_S_COMPLETE) {
468 printerr(0, "WARNING: gss_krb5_ccache_name with "
469 "name '%s' failed (%s)\n",
470 ccname, error_message(min_stat));
474 * Set the KRB5CCNAME environment variable to tell the krb5 code
475 * which credentials cache to use. (Instead of using the private
476 * function above for which there is no generic gssapi
479 printerr(2, "using environment variable to select krb5 ccache %s\n",
481 setenv("KRB5CCNAME", ccname, 1);
486 * Given a principal, find a matching ple structure
488 static struct gssd_k5_kt_princ *
489 find_ple_by_princ(krb5_context context, krb5_principal princ)
491 struct gssd_k5_kt_princ *ple;
493 for (ple = gssd_k5_kt_princ_list; ple != NULL; ple = ple->next) {
494 if (krb5_principal_compare(context, ple->princ, princ))
502 * Create, initialize, and add a new ple structure to the global list
504 static struct gssd_k5_kt_princ *
505 new_ple(krb5_context context, krb5_principal princ)
507 struct gssd_k5_kt_princ *ple = NULL, *p;
508 krb5_error_code code;
510 int is_default_realm = 0;
512 ple = malloc(sizeof(struct gssd_k5_kt_princ));
515 memset(ple, 0, sizeof(*ple));
518 ple->realm = strndup(princ->realm.data,
519 princ->realm.length);
521 ple->realm = strdup(princ->realm);
523 if (ple->realm == NULL)
525 code = krb5_copy_principal(context, princ, &ple->princ);
530 * Add new entry onto the list (if this is the default
531 * realm, always add to the front of the list)
534 code = krb5_get_default_realm(context, &default_realm);
536 if (strcmp(ple->realm, default_realm) == 0)
537 is_default_realm = 1;
538 k5_free_default_realm(context, default_realm);
541 if (is_default_realm) {
542 ple->next = gssd_k5_kt_princ_list;
543 gssd_k5_kt_princ_list = ple;
545 p = gssd_k5_kt_princ_list;
546 while (p != NULL && p->next != NULL)
549 gssd_k5_kt_princ_list = ple;
565 * Given a principal, find an existing ple structure, or create one
567 static struct gssd_k5_kt_princ *
568 get_ple_by_princ(krb5_context context, krb5_principal princ)
570 struct gssd_k5_kt_princ *ple;
572 /* Need to serialize list if we ever become multi-threaded! */
574 ple = find_ple_by_princ(context, princ);
576 ple = new_ple(context, princ);
583 * Given a (possibly unqualified) hostname,
584 * return the fully qualified (lower-case!) hostname
587 get_full_hostname(const char *inhost, char *outhost, int outhostlen)
589 struct addrinfo *addrs = NULL;
590 struct addrinfo hints;
594 memset(&hints, 0, sizeof(hints));
595 hints.ai_socktype = SOCK_STREAM;
596 hints.ai_family = PF_UNSPEC;
597 hints.ai_flags = AI_CANONNAME;
599 /* Get full target hostname */
600 retval = getaddrinfo(inhost, NULL, &hints, &addrs);
602 printerr(0, "%s while getting full hostname for '%s'\n",
603 gai_strerror(retval), inhost);
606 strncpy(outhost, addrs->ai_canonname, outhostlen);
608 for (c = outhost; *c != '\0'; c++)
611 printerr(3, "Full hostname for '%s' is '%s'\n", inhost, outhost);
618 * If principal matches the given realm and service name,
619 * and has *any* instance (hostname), return 1.
620 * Otherwise return 0, indicating no match.
623 realm_and_service_match(krb5_context context, krb5_principal p,
624 const char *realm, const char *service)
627 /* Must have two components */
630 if ((strlen(realm) == p->realm.length)
631 && (strncmp(realm, p->realm.data, p->realm.length) == 0)
632 && (strlen(service) == p->data[0].length)
633 && (strncmp(service, p->data[0].data, p->data[0].length) == 0))
636 const char *name, *inst;
638 if (p->name.name_string.len != 2)
640 name = krb5_principal_get_comp_string(context, p, 0);
641 inst = krb5_principal_get_comp_string(context, p, 1);
642 if (name == NULL || inst == NULL)
644 if ((strcmp(realm, p->realm) == 0)
645 && (strcmp(service, name) == 0))
652 * Search the given keytab file looking for an entry with the given
653 * service name and realm, ignoring hostname (instance).
657 * non-zero => An error occurred
659 * If a keytab entry is found, "found" is set to one, and the keytab
660 * entry is returned in "kte". Otherwise, "found" is zero, and the
661 * value of "kte" is unpredictable.
664 gssd_search_krb5_keytab(krb5_context context, krb5_keytab kt,
665 const char *realm, const char *service,
666 int *found, krb5_keytab_entry *kte)
668 krb5_kt_cursor cursor;
669 krb5_error_code code;
670 struct gssd_k5_kt_princ *ple;
672 char kt_name[BUFSIZ];
682 * Look through each entry in the keytab file and determine
683 * if we might want to use it as machine credentials. If so,
684 * save info in the global principal list (gssd_k5_kt_princ_list).
686 if ((code = krb5_kt_get_name(context, kt, kt_name, BUFSIZ))) {
687 printerr(0, "ERROR: %s attempting to get keytab name\n",
688 gssd_k5_err_msg(context, code));
692 if ((code = krb5_kt_start_seq_get(context, kt, &cursor))) {
693 printerr(0, "ERROR: %s while beginning keytab scan "
695 gssd_k5_err_msg(context, code), kt_name);
700 while ((code = krb5_kt_next_entry(context, kt, kte, &cursor)) == 0) {
701 if ((code = krb5_unparse_name(context, kte->principal,
703 printerr(0, "WARNING: Skipping keytab entry because "
704 "we failed to unparse principal name: %s\n",
705 gssd_k5_err_msg(context, code));
706 k5_free_kt_entry(context, kte);
709 printerr(4, "Processing keytab entry for principal '%s'\n",
711 /* Use the first matching keytab entry found */
712 if ((realm_and_service_match(context, kte->principal, realm,
714 printerr(4, "We WILL use this entry (%s)\n", pname);
715 ple = get_ple_by_princ(context, kte->principal);
717 * Return, don't free, keytab entry if
718 * we were successful!
722 k5_free_kt_entry(context, kte);
727 k5_free_unparsed_name(context, pname);
731 printerr(4, "We will NOT use this entry (%s)\n",
734 k5_free_unparsed_name(context, pname);
735 k5_free_kt_entry(context, kte);
738 if ((code = krb5_kt_end_seq_get(context, kt, &cursor))) {
739 printerr(0, "WARNING: %s while ending keytab scan for "
741 gssd_k5_err_msg(context, code), kt_name);
750 * Find a keytab entry to use for a given target hostname.
751 * Tries to find the most appropriate keytab to use given the
752 * name of the host we are trying to connect with.
755 find_keytab_entry(krb5_context context, krb5_keytab kt, const char *hostname,
756 krb5_keytab_entry *kte)
758 krb5_error_code code;
759 const char *svcnames[] = { "root", "nfs", "host", NULL };
760 char **realmnames = NULL;
761 char myhostname[NI_MAXHOST], targethostname[NI_MAXHOST];
763 char *default_realm = NULL;
765 int tried_all = 0, tried_default = 0;
766 krb5_principal princ;
769 /* Get full target hostname */
770 retval = get_full_hostname(hostname, targethostname,
771 sizeof(targethostname));
775 /* Get full local hostname */
776 retval = gethostname(myhostname, sizeof(myhostname));
778 printerr(1, "%s while getting local hostname\n",
779 gssd_k5_err_msg(context, retval));
782 retval = get_full_hostname(myhostname, myhostname, sizeof(myhostname));
786 code = krb5_get_default_realm(context, &default_realm);
789 printerr(1, "%s while getting default realm name\n",
790 gssd_k5_err_msg(context, code));
795 * Get the realm name(s) for the target hostname.
796 * In reality, this function currently only returns a
797 * single realm, but we code with the assumption that
798 * someday it may actually return a list.
800 code = krb5_get_host_realm(context, targethostname, &realmnames);
802 printerr(0, "ERROR: %s while getting realm(s) for host '%s'\n",
803 gssd_k5_err_msg(context, code), targethostname);
809 * Try the "appropriate" realm first, and if nothing found for that
810 * realm, try the default realm (if it hasn't already been tried).
813 realm = realmnames[i];
818 realm = default_realm;
820 if (tried_all && tried_default)
822 if (strcmp(realm, default_realm) == 0)
824 for (j = 0; svcnames[j] != NULL; j++) {
825 code = krb5_build_principal_ext(context, &princ,
834 printerr(1, "%s while building principal for "
836 gssd_k5_err_msg(context, code),
837 svcnames[j], myhostname, realm);
840 code = krb5_kt_get_entry(context, kt, princ, 0, 0, kte);
841 krb5_free_principal(context, princ);
843 printerr(3, "%s while getting keytab entry for "
845 gssd_k5_err_msg(context, code),
846 svcnames[j], myhostname, realm);
848 printerr(3, "Success getting keytab entry for "
850 svcnames[j], myhostname, realm);
857 * Nothing found with our hostname instance, now look for
858 * names with any instance (they must have an instance)
860 for (j = 0; svcnames[j] != NULL; j++) {
862 code = gssd_search_krb5_keytab(context, kt, realm,
863 svcnames[j], &found, kte);
864 if (!code && found) {
865 printerr(3, "Success getting keytab entry for "
866 "%s/*@%s\n", svcnames[j], realm);
873 realm = realmnames[i];
878 k5_free_default_realm(context, default_realm);
880 krb5_free_host_realm(context, realmnames);
884 /*==========================*/
885 /*=== External routines ===*/
886 /*==========================*/
889 * Attempt to find the best match for a credentials cache file
890 * given only a UID. We really need more information, but we
891 * do the best we can.
897 gssd_setup_krb5_user_gss_ccache(uid_t uid, char *servername)
899 char buf[MAX_NETOBJ_SZ];
902 printerr(2, "getting credentials for client with uid %u for "
903 "server %s\n", uid, servername);
904 memset(buf, 0, sizeof(buf));
905 if (gssd_find_existing_krb5_ccache(uid, &d)) {
906 snprintf(buf, sizeof(buf), "FILE:%s/%s",
907 ccachedir, d->d_name);
911 snprintf(buf, sizeof(buf), "FILE:%s/%s%u",
912 ccachedir, GSSD_DEFAULT_CRED_PREFIX, uid);
913 printerr(2, "using %s as credentials cache for client with "
914 "uid %u for server %s\n", buf, uid, servername);
915 gssd_set_krb5_ccache_name(buf);
919 * Let the gss code know where to find the machine credentials ccache.
925 gssd_setup_krb5_machine_gss_ccache(char *ccname)
927 printerr(2, "using %s as credentials cache for machine creds\n",
929 gssd_set_krb5_ccache_name(ccname);
933 * Return an array of pointers to names of credential cache files
934 * which can be used to try to create gss contexts with a server.
937 * 0 => list is attached
941 gssd_get_krb5_machine_cred_list(char ***list)
945 int listsize = listinc;
948 struct gssd_k5_kt_princ *ple;
952 *list = (char **) NULL;
954 if ((l = (char **) malloc(listsize * sizeof(char *))) == NULL) {
959 /* Need to serialize list if we ever become multi-threaded! */
961 for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
963 /* Make sure cred is up-to-date before returning it */
964 retval = gssd_refresh_krb5_machine_credential(NULL, ple);
967 if (i + 1 > listsize) {
970 realloc(l, listsize * sizeof(char *));
976 if ((l[i++] = strdup(ple->ccname)) == NULL) {
993 * Frees the list of names returned in get_krb5_machine_cred_list()
996 gssd_free_krb5_machine_cred_list(char **list)
1002 for (n = list; n && *n; n++) {
1009 * Called upon exit. Destroys machine credentials.
1012 gssd_destroy_krb5_machine_creds(void)
1014 krb5_context context;
1015 krb5_error_code code = 0;
1017 struct gssd_k5_kt_princ *ple;
1019 code = krb5_init_context(&context);
1021 printerr(0, "ERROR: %s while initializing krb5\n",
1022 gssd_k5_err_msg(NULL, code));
1026 for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
1029 if ((code = krb5_cc_resolve(context, ple->ccname, &ccache))) {
1030 printerr(0, "WARNING: %s while resolving credential "
1031 "cache '%s' for destruction\n",
1032 gssd_k5_err_msg(context, code), ple->ccname);
1036 if ((code = krb5_cc_destroy(context, ccache))) {
1037 printerr(0, "WARNING: %s while destroying credential "
1039 gssd_k5_err_msg(context, code), ple->ccname);
1043 krb5_free_context(context);
1047 * Obtain (or refresh if necessary) Kerberos machine credentials
1050 gssd_refresh_krb5_machine_credential(char *hostname,
1051 struct gssd_k5_kt_princ *ple)
1053 krb5_error_code code = 0;
1054 krb5_context context;
1055 krb5_keytab kt = NULL;;
1058 if (hostname == NULL && ple == NULL)
1061 code = krb5_init_context(&context);
1063 printerr(0, "ERROR: %s: %s while initializing krb5 context\n",
1064 __FUNCTION__, gssd_k5_err_msg(NULL, code));
1069 if ((code = krb5_kt_resolve(context, keytabfile, &kt))) {
1070 printerr(0, "ERROR: %s: %s while resolving keytab '%s'\n",
1071 __FUNCTION__, gssd_k5_err_msg(context, code),
1077 krb5_keytab_entry kte;
1079 code = find_keytab_entry(context, kt, hostname, &kte);
1081 printerr(0, "ERROR: %s: no usable keytab entry found "
1082 "in keytab %s for connection with host %s\n",
1083 __FUNCTION__, keytabfile, hostname);
1088 ple = get_ple_by_princ(context, kte.principal);
1089 k5_free_kt_entry(context, &kte);
1092 if ((krb5_unparse_name(context, kte.principal, &pname))) {
1095 printerr(0, "ERROR: %s: Could not locate or create "
1096 "ple struct for principal %s for connection "
1098 __FUNCTION__, pname ? pname : "<unparsable>",
1100 if (pname) k5_free_unparsed_name(context, pname);
1104 retval = gssd_get_single_krb5_cred(context, kt, ple);
1107 krb5_kt_close(context, kt);
1108 krb5_free_context(context);
1113 * A common routine for getting the Kerberos error message
1116 gssd_k5_err_msg(krb5_context context, krb5_error_code code)
1118 const char *msg = NULL;
1119 #if HAVE_KRB5_GET_ERROR_MESSAGE
1120 if (context != NULL)
1121 msg = krb5_get_error_message(context, code);
1126 return error_message(code);
1128 if (context != NULL)
1129 return krb5_get_err_text(context, code);
1131 return error_message(code);