2 * Adapted in part from MIT Kerberos 5-1.2.1 slave/kprop.c and from
3 * http://docs.sun.com/?p=/doc/816-1331/6m7oo9sms&a=view
5 * Copyright (c) 2002-2004 The Regents of the University of Michigan.
8 * Andy Adamson <andros@umich.edu>
9 * J. Bruce Fields <bfields@umich.edu>
10 * Marius Aamodt Eriksen <marius@umich.edu>
11 * Kevin Coffman <kwc@umich.edu>
17 * Copyright 1990,1991 by the Massachusetts Institute of Technology.
18 * All Rights Reserved.
20 * Export of this software from the United States of America may
21 * require a specific license from the United States Government.
22 * It is the responsibility of any person or organization contemplating
23 * export to obtain such a license before exporting.
25 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
26 * distribute this software and its documentation for any purpose and
27 * without fee is hereby granted, provided that the above copyright
28 * notice appear in all copies and that both that copyright notice and
29 * this permission notice appear in supporting documentation, and that
30 * the name of M.I.T. not be used in advertising or publicity pertaining
31 * to distribution of the software without specific, written prior
32 * permission. Furthermore if you modify this software you must label
33 * your software as modified software and not distribute it in such a
34 * fashion that it might be confused with the original M.I.T. software.
35 * M.I.T. makes no representations about the suitability of
36 * this software for any purpose. It is provided "as is" without express
37 * or implied warranty.
41 * Copyright 1994 by OpenVision Technologies, Inc.
43 * Permission to use, copy, modify, distribute, and sell this software
44 * and its documentation for any purpose is hereby granted without fee,
45 * provided that the above copyright notice appears in all copies and
46 * that both that copyright notice and this permission notice appear in
47 * supporting documentation, and that the name of OpenVision not be used
48 * in advertising or publicity pertaining to distribution of the software
49 * without specific, written prior permission. OpenVision makes no
50 * representations about the suitability of this software for any
51 * purpose. It is provided "as is" without express or implied warranty.
53 * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
54 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
55 * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
56 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
57 * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
58 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
59 * PERFORMANCE OF THIS SOFTWARE.
64 Copyright (c) 2004 The Regents of the University of Michigan.
67 Redistribution and use in source and binary forms, with or without
68 modification, are permitted provided that the following conditions
71 1. Redistributions of source code must retain the above copyright
72 notice, this list of conditions and the following disclaimer.
73 2. Redistributions in binary form must reproduce the above copyright
74 notice, this list of conditions and the following disclaimer in the
75 documentation and/or other materials provided with the distribution.
76 3. Neither the name of the University nor the names of its
77 contributors may be used to endorse or promote products derived
78 from this software without specific prior written permission.
80 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
81 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
82 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
83 DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
84 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
85 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
86 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
87 BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
88 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
89 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
90 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
96 #endif /* HAVE_CONFIG_H */
102 #include <sys/param.h>
104 #include <sys/stat.h>
105 #include <sys/socket.h>
106 #include <arpa/inet.h>
117 #include <gssapi/gssapi.h>
118 #ifdef USE_PRIVATE_KRB5_FUNCTIONS
119 #include <gssapi/gssapi_krb5.h>
122 #include <rpc/auth_gss.h>
125 #include "err_util.h"
126 #include "gss_util.h"
127 #include "krb5_util.h"
129 /* Global list of principals/cache file names for machine credentials */
130 struct gssd_k5_kt_princ *gssd_k5_kt_princ_list = NULL;
132 /*==========================*/
133 /*=== Internal routines ===*/
134 /*==========================*/
136 static int select_krb5_ccache(const struct dirent *d);
137 static int gssd_find_existing_krb5_ccache(uid_t uid, char *dirname,
139 static int gssd_get_single_krb5_cred(krb5_context context,
140 krb5_keytab kt, struct gssd_k5_kt_princ *ple, int nocache);
141 static int query_krb5_ccache(const char* cred_cache, char **ret_princname,
145 * Called from the scandir function to weed out potential krb5
146 * credentials cache files
149 * 0 => don't select this one
150 * 1 => select this one
153 select_krb5_ccache(const struct dirent *d)
156 * Note: We used to check d->d_type for DT_REG here,
157 * but apparenlty reiser4 always has DT_UNKNOWN.
158 * Check for IS_REG after stat() call instead.
160 if (strstr(d->d_name, GSSD_DEFAULT_CRED_PREFIX))
167 * Look in directory "dirname" for files that look like they
168 * are Kerberos Credential Cache files for a given UID. Return
169 * non-zero and the dirent pointer for the entry most likely to be
170 * what we want. Otherwise, return zero and no dirent pointer.
171 * The caller is responsible for freeing the dirent if one is returned.
173 * Returns 0 if a valid-looking entry was found and a non-zero error
177 gssd_find_existing_krb5_ccache(uid_t uid, char *dirname, struct dirent **d)
179 struct dirent **namelist;
183 struct dirent *best_match_dir = NULL;
184 struct stat best_match_stat, tmp_stat;
186 char *princname = NULL;
188 int score, best_match_score = 0, err = -EACCES;
190 memset(&best_match_stat, 0, sizeof(best_match_stat));
192 n = scandir(dirname, &namelist, select_krb5_ccache, 0);
194 printerr(1, "Error doing scandir on directory '%s': %s\n",
195 dirname, strerror(errno));
199 for (i = 0; i < n; i++) {
200 snprintf(statname, sizeof(statname),
201 "%s/%s", dirname, namelist[i]->d_name);
202 printerr(3, "CC file '%s' being considered, "
203 "with preferred realm '%s'\n",
204 statname, preferred_realm ?
205 preferred_realm : "<none selected>");
206 snprintf(buf, sizeof(buf), "FILE:%s/%s", dirname,
207 namelist[i]->d_name);
208 if (lstat(statname, &tmp_stat)) {
209 printerr(0, "Error doing stat on file '%s'\n",
214 /* Only pick caches owned by the user (uid) */
215 if (tmp_stat.st_uid != uid) {
216 printerr(3, "CC file '%s' owned by %u, not %u\n",
217 statname, tmp_stat.st_uid, uid);
221 if (!S_ISREG(tmp_stat.st_mode)) {
222 printerr(3, "CC file '%s' is not a regular file\n",
227 if (!query_krb5_ccache(buf, &princname, &realm)) {
228 printerr(3, "CC file '%s' is expired or corrupt\n",
236 if (preferred_realm &&
237 strcmp(realm, preferred_realm) == 0)
240 printerr(3, "CC file '%s'(%s@%s) passed all checks and"
241 " has mtime of %u\n",
242 statname, princname, realm,
245 * if more than one match is found, return the most
246 * recent (the one with the latest mtime), and
247 * don't free the dirent
250 best_match_dir = namelist[i];
251 best_match_stat = tmp_stat;
252 best_match_score = score;
257 * If current score is higher than best match
258 * score, we use the current match. Otherwise,
259 * if the current match has an mtime later
260 * than the one we are looking at, then use
261 * the current match. Otherwise, we still
262 * have the best match.
264 if (best_match_score < score ||
265 (best_match_score == score &&
267 best_match_stat.st_mtime)) {
268 free(best_match_dir);
269 best_match_dir = namelist[i];
270 best_match_stat = tmp_stat;
271 best_match_score = score;
276 printerr(3, "CC file '%s/%s' is our "
277 "current best match "
278 "with mtime of %u\n",
279 dirname, best_match_dir->d_name,
280 best_match_stat.st_mtime);
296 #ifdef HAVE_SET_ALLOWABLE_ENCTYPES
298 * this routine obtains a credentials handle via gss_acquire_cred()
299 * then calls gss_krb5_set_allowable_enctypes() to limit the encryption
302 * XXX Should call some function to determine the enctypes supported
303 * by the kernel. (Only need to do that once!)
307 * -1 => there was an error
311 limit_krb5_enctypes(struct rpc_gss_sec *sec, uid_t uid)
313 u_int maj_stat, min_stat;
315 gss_OID_set_desc desired_mechs;
316 krb5_enctype enctypes[] = { ENCTYPE_DES_CBC_CRC,
318 ENCTYPE_DES_CBC_MD4 };
319 int num_enctypes = sizeof(enctypes) / sizeof(enctypes[0]);
321 /* We only care about getting a krb5 cred */
322 desired_mechs.count = 1;
323 desired_mechs.elements = &krb5oid;
325 maj_stat = gss_acquire_cred(&min_stat, NULL, 0,
326 &desired_mechs, GSS_C_INITIATE,
329 if (maj_stat != GSS_S_COMPLETE) {
330 if (get_verbosity() > 0)
331 pgsserr("gss_acquire_cred",
332 maj_stat, min_stat, &krb5oid);
336 maj_stat = gss_set_allowable_enctypes(&min_stat, credh, &krb5oid,
337 num_enctypes, &enctypes);
338 if (maj_stat != GSS_S_COMPLETE) {
339 pgsserr("gss_set_allowable_enctypes",
340 maj_stat, min_stat, &krb5oid);
341 gss_release_cred(&min_stat, &credh);
348 #endif /* HAVE_SET_ALLOWABLE_ENCTYPES */
351 * Obtain credentials via a key in the keytab given
352 * a keytab handle and a gssd_k5_kt_princ structure.
353 * Checks to see if current credentials are expired,
354 * if not, uses the keytab to obtain new credentials.
357 * 0 => success (or credentials have not expired)
361 gssd_get_single_krb5_cred(krb5_context context,
363 struct gssd_k5_kt_princ *ple,
366 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
367 krb5_get_init_creds_opt *init_opts = NULL;
369 krb5_get_init_creds_opt options;
371 krb5_get_init_creds_opt *opts;
373 krb5_ccache ccache = NULL;
374 char kt_name[BUFSIZ];
375 char cc_name[BUFSIZ];
377 time_t now = time(0);
382 memset(&my_creds, 0, sizeof(my_creds));
384 if (ple->ccname && ple->endtime > now && !nocache) {
385 printerr(2, "INFO: Credentials in CC '%s' are good until %d\n",
386 ple->ccname, ple->endtime);
391 if ((code = krb5_kt_get_name(context, kt, kt_name, BUFSIZ))) {
392 printerr(0, "ERROR: Unable to get keytab name in "
393 "gssd_get_single_krb5_cred\n");
397 if ((krb5_unparse_name(context, ple->princ, &pname)))
400 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
401 code = krb5_get_init_creds_opt_alloc(context, &init_opts);
403 k5err = gssd_k5_err_msg(context, code);
404 printerr(0, "ERROR: %s allocating gic options\n", k5err);
407 if (krb5_get_init_creds_opt_set_addressless(context, init_opts, 1))
408 printerr(1, "WARNING: Unable to set option for addressless "
409 "tickets. May have problems behind a NAT.\n");
410 #ifdef TEST_SHORT_LIFETIME
411 /* set a short lifetime (for debugging only!) */
412 printerr(0, "WARNING: Using (debug) short machine cred lifetime!\n");
413 krb5_get_init_creds_opt_set_tkt_life(init_opts, 5*60);
417 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS */
419 krb5_get_init_creds_opt_init(&options);
420 krb5_get_init_creds_opt_set_address_list(&options, NULL);
421 #ifdef TEST_SHORT_LIFETIME
422 /* set a short lifetime (for debugging only!) */
423 printerr(0, "WARNING: Using (debug) short machine cred lifetime!\n");
424 krb5_get_init_creds_opt_set_tkt_life(&options, 5*60);
429 if ((code = krb5_get_init_creds_keytab(context, &my_creds, ple->princ,
430 kt, 0, NULL, opts))) {
431 k5err = gssd_k5_err_msg(context, code);
432 printerr(1, "WARNING: %s while getting initial ticket for "
433 "principal '%s' using keytab '%s'\n", k5err,
434 pname ? pname : "<unparsable>", kt_name);
439 * Initialize cache file which we're going to be using
443 cache_type = "MEMORY";
446 snprintf(cc_name, sizeof(cc_name), "%s:%s/%s%s_%s",
448 ccachesearch[0], GSSD_DEFAULT_CRED_PREFIX,
449 GSSD_DEFAULT_MACHINE_CRED_SUFFIX, ple->realm);
450 ple->endtime = my_creds.times.endtime;
451 if (ple->ccname != NULL)
453 ple->ccname = strdup(cc_name);
454 if (ple->ccname == NULL) {
455 printerr(0, "ERROR: no storage to duplicate credentials "
456 "cache name '%s'\n", cc_name);
460 if ((code = krb5_cc_resolve(context, cc_name, &ccache))) {
461 k5err = gssd_k5_err_msg(context, code);
462 printerr(0, "ERROR: %s while opening credential cache '%s'\n",
466 if ((code = krb5_cc_initialize(context, ccache, ple->princ))) {
467 k5err = gssd_k5_err_msg(context, code);
468 printerr(0, "ERROR: %s while initializing credential "
469 "cache '%s'\n", k5err, cc_name);
472 if ((code = krb5_cc_store_cred(context, ccache, &my_creds))) {
473 k5err = gssd_k5_err_msg(context, code);
474 printerr(0, "ERROR: %s while storing credentials in '%s'\n",
480 printerr(2, "Successfully obtained machine credentials for "
481 "principal '%s' stored in ccache '%s'\n", pname, cc_name);
483 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
485 krb5_get_init_creds_opt_free(context, init_opts);
488 k5_free_unparsed_name(context, pname);
490 krb5_cc_close(context, ccache);
491 krb5_free_cred_contents(context, &my_creds);
497 * Depending on the version of Kerberos, we either need to use
498 * a private function, or simply set the environment variable.
501 gssd_set_krb5_ccache_name(char *ccname)
503 #ifdef USE_GSS_KRB5_CCACHE_NAME
504 u_int maj_stat, min_stat;
506 printerr(2, "using gss_krb5_ccache_name to select krb5 ccache %s\n",
508 maj_stat = gss_krb5_ccache_name(&min_stat, ccname, NULL);
509 if (maj_stat != GSS_S_COMPLETE) {
510 printerr(0, "WARNING: gss_krb5_ccache_name with "
511 "name '%s' failed (%s)\n",
512 ccname, error_message(min_stat));
516 * Set the KRB5CCNAME environment variable to tell the krb5 code
517 * which credentials cache to use. (Instead of using the private
518 * function above for which there is no generic gssapi
521 printerr(2, "using environment variable to select krb5 ccache %s\n",
523 setenv("KRB5CCNAME", ccname, 1);
528 * Given a principal, find a matching ple structure
530 static struct gssd_k5_kt_princ *
531 find_ple_by_princ(krb5_context context, krb5_principal princ)
533 struct gssd_k5_kt_princ *ple;
535 for (ple = gssd_k5_kt_princ_list; ple != NULL; ple = ple->next) {
536 if (krb5_principal_compare(context, ple->princ, princ))
544 * Create, initialize, and add a new ple structure to the global list
546 static struct gssd_k5_kt_princ *
547 new_ple(krb5_context context, krb5_principal princ)
549 struct gssd_k5_kt_princ *ple = NULL, *p;
550 krb5_error_code code;
552 int is_default_realm = 0;
554 ple = malloc(sizeof(struct gssd_k5_kt_princ));
557 memset(ple, 0, sizeof(*ple));
560 ple->realm = strndup(princ->realm.data,
561 princ->realm.length);
563 ple->realm = strdup(princ->realm);
565 if (ple->realm == NULL)
567 code = krb5_copy_principal(context, princ, &ple->princ);
572 * Add new entry onto the list (if this is the default
573 * realm, always add to the front of the list)
576 code = krb5_get_default_realm(context, &default_realm);
578 if (strcmp(ple->realm, default_realm) == 0)
579 is_default_realm = 1;
580 k5_free_default_realm(context, default_realm);
583 if (is_default_realm) {
584 ple->next = gssd_k5_kt_princ_list;
585 gssd_k5_kt_princ_list = ple;
587 p = gssd_k5_kt_princ_list;
588 while (p != NULL && p->next != NULL)
591 gssd_k5_kt_princ_list = ple;
607 * Given a principal, find an existing ple structure, or create one
609 static struct gssd_k5_kt_princ *
610 get_ple_by_princ(krb5_context context, krb5_principal princ)
612 struct gssd_k5_kt_princ *ple;
614 /* Need to serialize list if we ever become multi-threaded! */
616 ple = find_ple_by_princ(context, princ);
618 ple = new_ple(context, princ);
625 * Given a (possibly unqualified) hostname,
626 * return the fully qualified (lower-case!) hostname
629 get_full_hostname(const char *inhost, char *outhost, int outhostlen)
631 struct addrinfo *addrs = NULL;
632 struct addrinfo hints;
636 memset(&hints, 0, sizeof(hints));
637 hints.ai_socktype = SOCK_STREAM;
638 hints.ai_family = PF_UNSPEC;
639 hints.ai_flags = AI_CANONNAME;
641 /* Get full target hostname */
642 retval = getaddrinfo(inhost, NULL, &hints, &addrs);
644 printerr(1, "%s while getting full hostname for '%s'\n",
645 gai_strerror(retval), inhost);
648 strncpy(outhost, addrs->ai_canonname, outhostlen);
650 for (c = outhost; *c != '\0'; c++)
653 printerr(3, "Full hostname for '%s' is '%s'\n", inhost, outhost);
660 * If principal matches the given realm and service name,
661 * and has *any* instance (hostname), return 1.
662 * Otherwise return 0, indicating no match.
665 realm_and_service_match(krb5_context context, krb5_principal p,
666 const char *realm, const char *service)
669 /* Must have two components */
672 if ((strlen(realm) == p->realm.length)
673 && (strncmp(realm, p->realm.data, p->realm.length) == 0)
674 && (strlen(service) == p->data[0].length)
675 && (strncmp(service, p->data[0].data, p->data[0].length) == 0))
678 const char *name, *inst;
680 if (p->name.name_string.len != 2)
682 name = krb5_principal_get_comp_string(context, p, 0);
683 inst = krb5_principal_get_comp_string(context, p, 1);
684 if (name == NULL || inst == NULL)
686 if ((strcmp(realm, p->realm) == 0)
687 && (strcmp(service, name) == 0))
694 * Search the given keytab file looking for an entry with the given
695 * service name and realm, ignoring hostname (instance).
699 * non-zero => An error occurred
701 * If a keytab entry is found, "found" is set to one, and the keytab
702 * entry is returned in "kte". Otherwise, "found" is zero, and the
703 * value of "kte" is unpredictable.
706 gssd_search_krb5_keytab(krb5_context context, krb5_keytab kt,
707 const char *realm, const char *service,
708 int *found, krb5_keytab_entry *kte)
710 krb5_kt_cursor cursor;
711 krb5_error_code code;
712 struct gssd_k5_kt_princ *ple;
714 char kt_name[BUFSIZ];
725 * Look through each entry in the keytab file and determine
726 * if we might want to use it as machine credentials. If so,
727 * save info in the global principal list (gssd_k5_kt_princ_list).
729 if ((code = krb5_kt_get_name(context, kt, kt_name, BUFSIZ))) {
730 k5err = gssd_k5_err_msg(context, code);
731 printerr(0, "ERROR: %s attempting to get keytab name\n", k5err);
735 if ((code = krb5_kt_start_seq_get(context, kt, &cursor))) {
736 k5err = gssd_k5_err_msg(context, code);
737 printerr(0, "ERROR: %s while beginning keytab scan "
738 "for keytab '%s'\n", k5err, kt_name);
743 while ((code = krb5_kt_next_entry(context, kt, kte, &cursor)) == 0) {
744 if ((code = krb5_unparse_name(context, kte->principal,
746 k5err = gssd_k5_err_msg(context, code);
747 printerr(0, "WARNING: Skipping keytab entry because "
748 "we failed to unparse principal name: %s\n",
750 k5_free_kt_entry(context, kte);
753 printerr(4, "Processing keytab entry for principal '%s'\n",
755 /* Use the first matching keytab entry found */
756 if ((realm_and_service_match(context, kte->principal, realm,
758 printerr(4, "We WILL use this entry (%s)\n", pname);
759 ple = get_ple_by_princ(context, kte->principal);
761 * Return, don't free, keytab entry if
762 * we were successful!
766 k5_free_kt_entry(context, kte);
771 k5_free_unparsed_name(context, pname);
775 printerr(4, "We will NOT use this entry (%s)\n",
778 k5_free_unparsed_name(context, pname);
779 k5_free_kt_entry(context, kte);
782 if ((code = krb5_kt_end_seq_get(context, kt, &cursor))) {
783 k5err = gssd_k5_err_msg(context, code);
784 printerr(0, "WARNING: %s while ending keytab scan for "
785 "keytab '%s'\n", k5err, kt_name);
795 * Find a keytab entry to use for a given target hostname.
796 * Tries to find the most appropriate keytab to use given the
797 * name of the host we are trying to connect with.
800 find_keytab_entry(krb5_context context, krb5_keytab kt, const char *hostname,
801 krb5_keytab_entry *kte, const char **svcnames)
803 krb5_error_code code;
804 char **realmnames = NULL;
805 char myhostname[NI_MAXHOST], targethostname[NI_MAXHOST];
807 char *default_realm = NULL;
810 int tried_all = 0, tried_default = 0;
811 krb5_principal princ;
814 /* Get full target hostname */
815 retval = get_full_hostname(hostname, targethostname,
816 sizeof(targethostname));
820 /* Get full local hostname */
821 retval = gethostname(myhostname, sizeof(myhostname));
823 k5err = gssd_k5_err_msg(context, retval);
824 printerr(1, "%s while getting local hostname\n", k5err);
827 retval = get_full_hostname(myhostname, myhostname, sizeof(myhostname));
831 code = krb5_get_default_realm(context, &default_realm);
834 k5err = gssd_k5_err_msg(context, code);
835 printerr(1, "%s while getting default realm name\n", k5err);
840 * Get the realm name(s) for the target hostname.
841 * In reality, this function currently only returns a
842 * single realm, but we code with the assumption that
843 * someday it may actually return a list.
845 code = krb5_get_host_realm(context, targethostname, &realmnames);
847 k5err = gssd_k5_err_msg(context, code);
848 printerr(0, "ERROR: %s while getting realm(s) for host '%s'\n",
849 k5err, targethostname);
855 * Try the "appropriate" realm first, and if nothing found for that
856 * realm, try the default realm (if it hasn't already been tried).
859 realm = realmnames[i];
864 realm = default_realm;
866 if (tried_all && tried_default)
868 if (strcmp(realm, default_realm) == 0)
870 for (j = 0; svcnames[j] != NULL; j++) {
871 code = krb5_build_principal_ext(context, &princ,
880 k5err = gssd_k5_err_msg(context, code);
881 printerr(1, "%s while building principal for "
882 "'%s/%s@%s'\n", k5err, svcnames[j],
886 code = krb5_kt_get_entry(context, kt, princ, 0, 0, kte);
887 krb5_free_principal(context, princ);
889 k5err = gssd_k5_err_msg(context, code);
890 printerr(3, "%s while getting keytab entry for "
891 "'%s/%s@%s'\n", k5err, svcnames[j],
894 printerr(3, "Success getting keytab entry for "
896 svcnames[j], myhostname, realm);
903 * Nothing found with our hostname instance, now look for
904 * names with any instance (they must have an instance)
906 for (j = 0; svcnames[j] != NULL; j++) {
908 code = gssd_search_krb5_keytab(context, kt, realm,
909 svcnames[j], &found, kte);
910 if (!code && found) {
911 printerr(3, "Success getting keytab entry for "
912 "%s/*@%s\n", svcnames[j], realm);
919 realm = realmnames[i];
924 k5_free_default_realm(context, default_realm);
926 krb5_free_host_realm(context, realmnames);
932 static inline int data_is_equal(krb5_data d1, krb5_data d2)
934 return (d1.length == d2.length
935 && memcmp(d1.data, d2.data, d1.length) == 0);
939 check_for_tgt(krb5_context context, krb5_ccache ccache,
940 krb5_principal principal)
947 ret = krb5_cc_start_seq_get(context, ccache, &cur);
952 (ret = krb5_cc_next_cred(context, ccache, &cur, &creds)) == 0) {
953 if (creds.server->length == 2 &&
954 data_is_equal(creds.server->realm,
956 creds.server->data[0].length == 6 &&
957 memcmp(creds.server->data[0].data,
959 data_is_equal(creds.server->data[1],
961 creds.times.endtime > time(NULL))
963 krb5_free_cred_contents(context, &creds);
965 krb5_cc_end_seq_get(context, ccache, &cur);
971 query_krb5_ccache(const char* cred_cache, char **ret_princname,
975 krb5_context context;
977 krb5_principal principal;
982 ret = krb5_init_context(&context);
986 if(!cred_cache || krb5_cc_resolve(context, cred_cache, &ccache))
989 if (krb5_cc_set_flags(context, ccache, 0))
992 ret = krb5_cc_get_principal(context, ccache, &principal);
996 found = check_for_tgt(context, ccache, principal);
998 ret = krb5_unparse_name(context, principal, &princstring);
1000 if ((str = strchr(princstring, '@')) != NULL) {
1002 *ret_princname = strdup(princstring);
1003 *ret_realm = strdup(str+1);
1005 k5_free_unparsed_name(context, princstring);
1010 krb5_free_principal(context, principal);
1012 krb5_cc_set_flags(context, ccache, KRB5_TC_OPENCLOSE);
1013 krb5_cc_close(context, ccache);
1015 krb5_free_context(context);
1019 /*==========================*/
1020 /*=== External routines ===*/
1021 /*==========================*/
1024 * Attempt to find the best match for a credentials cache file
1025 * given only a UID. We really need more information, but we
1026 * do the best we can.
1028 * Returns 0 if a ccache was found, and a non-zero error code otherwise.
1031 gssd_setup_krb5_user_gss_ccache(uid_t uid, char *servername, char *dirname)
1033 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 err = gssd_find_existing_krb5_ccache(uid, dirname, &d);
1044 snprintf(buf, sizeof(buf), "FILE:%s/%s", dirname, d->d_name);
1047 printerr(2, "using %s as credentials cache for client with "
1048 "uid %u for server %s\n", buf, uid, servername);
1049 gssd_set_krb5_ccache_name(buf);
1054 * Let the gss code know where to find the machine credentials ccache.
1060 gssd_setup_krb5_machine_gss_ccache(char *ccname)
1062 printerr(2, "using %s as credentials cache for machine creds\n",
1064 gssd_set_krb5_ccache_name(ccname);
1068 * Return an array of pointers to names of credential cache files
1069 * which can be used to try to create gss contexts with a server.
1072 * 0 => list is attached
1076 gssd_get_krb5_machine_cred_list(char ***list)
1080 int listsize = listinc;
1083 struct gssd_k5_kt_princ *ple;
1085 /* Assume failure */
1087 *list = (char **) NULL;
1089 if ((l = (char **) malloc(listsize * sizeof(char *))) == NULL) {
1094 /* Need to serialize list if we ever become multi-threaded! */
1096 for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
1098 /* Make sure cred is up-to-date before returning it */
1099 retval = gssd_refresh_krb5_machine_credential(NULL, ple,
1103 if (i + 1 > listsize) {
1104 listsize += listinc;
1106 realloc(l, listsize * sizeof(char *));
1112 if ((l[i++] = strdup(ple->ccname)) == NULL) {
1129 * Frees the list of names returned in get_krb5_machine_cred_list()
1132 gssd_free_krb5_machine_cred_list(char **list)
1138 for (n = list; n && *n; n++) {
1145 * Called upon exit. Destroys machine credentials.
1148 gssd_destroy_krb5_machine_creds(void)
1150 krb5_context context;
1151 krb5_error_code code = 0;
1153 struct gssd_k5_kt_princ *ple;
1156 code = krb5_init_context(&context);
1158 k5err = gssd_k5_err_msg(NULL, code);
1159 printerr(0, "ERROR: %s while initializing krb5\n", k5err);
1163 for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
1166 if ((code = krb5_cc_resolve(context, ple->ccname, &ccache))) {
1167 k5err = gssd_k5_err_msg(context, code);
1168 printerr(0, "WARNING: %s while resolving credential "
1169 "cache '%s' for destruction\n", k5err,
1174 if ((code = krb5_cc_destroy(context, ccache))) {
1175 k5err = gssd_k5_err_msg(context, code);
1176 printerr(0, "WARNING: %s while destroying credential "
1177 "cache '%s'\n", k5err, ple->ccname);
1182 krb5_free_context(context);
1186 * Obtain (or refresh if necessary) Kerberos machine credentials
1189 gssd_refresh_krb5_machine_credential(char *hostname,
1190 struct gssd_k5_kt_princ *ple,
1193 krb5_error_code code = 0;
1194 krb5_context context;
1195 krb5_keytab kt = NULL;;
1198 const char *svcnames[4] = { "root", "nfs", "host", NULL };
1201 * If a specific service name was specified, use it.
1202 * Otherwise, use the default list.
1204 if (service != NULL && strcmp(service, "*") != 0) {
1205 svcnames[0] = service;
1208 if (hostname == NULL && ple == NULL)
1211 code = krb5_init_context(&context);
1213 k5err = gssd_k5_err_msg(NULL, code);
1214 printerr(0, "ERROR: %s: %s while initializing krb5 context\n",
1220 if ((code = krb5_kt_resolve(context, keytabfile, &kt))) {
1221 k5err = gssd_k5_err_msg(context, code);
1222 printerr(0, "ERROR: %s: %s while resolving keytab '%s'\n",
1223 __func__, k5err, keytabfile);
1228 krb5_keytab_entry kte;
1230 code = find_keytab_entry(context, kt, hostname, &kte, svcnames);
1232 printerr(0, "ERROR: %s: no usable keytab entry found "
1233 "in keytab %s for connection with host %s\n",
1234 __FUNCTION__, keytabfile, hostname);
1239 ple = get_ple_by_princ(context, kte.principal);
1240 k5_free_kt_entry(context, &kte);
1243 if ((krb5_unparse_name(context, kte.principal, &pname))) {
1246 printerr(0, "ERROR: %s: Could not locate or create "
1247 "ple struct for principal %s for connection "
1249 __FUNCTION__, pname ? pname : "<unparsable>",
1251 if (pname) k5_free_unparsed_name(context, pname);
1255 retval = gssd_get_single_krb5_cred(context, kt, ple, 0);
1258 krb5_kt_close(context, kt);
1259 krb5_free_context(context);
1265 * A common routine for getting the Kerberos error message
1268 gssd_k5_err_msg(krb5_context context, krb5_error_code code)
1270 const char *origmsg;
1273 #if HAVE_KRB5_GET_ERROR_MESSAGE
1274 if (context != NULL) {
1275 origmsg = krb5_get_error_message(context, code);
1276 msg = strdup(origmsg);
1277 krb5_free_error_message(context, origmsg);
1283 return strdup(error_message(code));
1285 if (context != NULL)
1286 return strdup(krb5_get_err_text(context, code));
1288 return strdup(error_message(code));
1293 * Return default Kerberos realm
1296 gssd_k5_get_default_realm(char **def_realm)
1298 krb5_context context;
1300 if (krb5_init_context(&context))
1303 krb5_get_default_realm(context, def_realm);
1305 krb5_free_context(context);