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 (uid == 0 && !root_uses_machine_creds &&
228 strstr(namelist[i]->d_name, "_machine_")) {
229 printerr(3, "CC file '%s' not available to root\n",
234 if (!query_krb5_ccache(buf, &princname, &realm)) {
235 printerr(3, "CC file '%s' is expired or corrupt\n",
243 if (preferred_realm &&
244 strcmp(realm, preferred_realm) == 0)
247 printerr(3, "CC file '%s'(%s@%s) passed all checks and"
248 " has mtime of %u\n",
249 statname, princname, realm,
252 * if more than one match is found, return the most
253 * recent (the one with the latest mtime), and
254 * don't free the dirent
257 best_match_dir = namelist[i];
258 best_match_stat = tmp_stat;
259 best_match_score = score;
264 * If current score is higher than best match
265 * score, we use the current match. Otherwise,
266 * if the current match has an mtime later
267 * than the one we are looking at, then use
268 * the current match. Otherwise, we still
269 * have the best match.
271 if (best_match_score < score ||
272 (best_match_score == score &&
274 best_match_stat.st_mtime)) {
275 free(best_match_dir);
276 best_match_dir = namelist[i];
277 best_match_stat = tmp_stat;
278 best_match_score = score;
283 printerr(3, "CC file '%s/%s' is our "
284 "current best match "
285 "with mtime of %u\n",
286 dirname, best_match_dir->d_name,
287 best_match_stat.st_mtime);
303 * Obtain credentials via a key in the keytab given
304 * a keytab handle and a gssd_k5_kt_princ structure.
305 * Checks to see if current credentials are expired,
306 * if not, uses the keytab to obtain new credentials.
309 * 0 => success (or credentials have not expired)
313 gssd_get_single_krb5_cred(krb5_context context,
315 struct gssd_k5_kt_princ *ple,
318 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
319 krb5_get_init_creds_opt *init_opts = NULL;
321 krb5_get_init_creds_opt options;
323 krb5_get_init_creds_opt *opts;
325 krb5_ccache ccache = NULL;
326 char kt_name[BUFSIZ];
327 char cc_name[BUFSIZ];
329 time_t now = time(0);
334 memset(&my_creds, 0, sizeof(my_creds));
336 if (ple->ccname && ple->endtime > now && !nocache) {
337 printerr(2, "INFO: Credentials in CC '%s' are good until %d\n",
338 ple->ccname, ple->endtime);
343 if ((code = krb5_kt_get_name(context, kt, kt_name, BUFSIZ))) {
344 printerr(0, "ERROR: Unable to get keytab name in "
345 "gssd_get_single_krb5_cred\n");
349 if ((krb5_unparse_name(context, ple->princ, &pname)))
352 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
353 code = krb5_get_init_creds_opt_alloc(context, &init_opts);
355 k5err = gssd_k5_err_msg(context, code);
356 printerr(0, "ERROR: %s allocating gic options\n", k5err);
359 if (krb5_get_init_creds_opt_set_addressless(context, init_opts, 1))
360 printerr(1, "WARNING: Unable to set option for addressless "
361 "tickets. May have problems behind a NAT.\n");
362 #ifdef TEST_SHORT_LIFETIME
363 /* set a short lifetime (for debugging only!) */
364 printerr(0, "WARNING: Using (debug) short machine cred lifetime!\n");
365 krb5_get_init_creds_opt_set_tkt_life(init_opts, 5*60);
369 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS */
371 krb5_get_init_creds_opt_init(&options);
372 krb5_get_init_creds_opt_set_address_list(&options, NULL);
373 #ifdef TEST_SHORT_LIFETIME
374 /* set a short lifetime (for debugging only!) */
375 printerr(0, "WARNING: Using (debug) short machine cred lifetime!\n");
376 krb5_get_init_creds_opt_set_tkt_life(&options, 5*60);
381 if ((code = krb5_get_init_creds_keytab(context, &my_creds, ple->princ,
382 kt, 0, NULL, opts))) {
383 k5err = gssd_k5_err_msg(context, code);
384 printerr(1, "WARNING: %s while getting initial ticket for "
385 "principal '%s' using keytab '%s'\n", k5err,
386 pname ? pname : "<unparsable>", kt_name);
391 * Initialize cache file which we're going to be using
395 cache_type = "MEMORY";
398 snprintf(cc_name, sizeof(cc_name), "%s:%s/%s%s_%s",
400 ccachesearch[0], GSSD_DEFAULT_CRED_PREFIX,
401 GSSD_DEFAULT_MACHINE_CRED_SUFFIX, ple->realm);
402 ple->endtime = my_creds.times.endtime;
403 if (ple->ccname != NULL)
405 ple->ccname = strdup(cc_name);
406 if (ple->ccname == NULL) {
407 printerr(0, "ERROR: no storage to duplicate credentials "
408 "cache name '%s'\n", cc_name);
412 if ((code = krb5_cc_resolve(context, cc_name, &ccache))) {
413 k5err = gssd_k5_err_msg(context, code);
414 printerr(0, "ERROR: %s while opening credential cache '%s'\n",
418 if ((code = krb5_cc_initialize(context, ccache, ple->princ))) {
419 k5err = gssd_k5_err_msg(context, code);
420 printerr(0, "ERROR: %s while initializing credential "
421 "cache '%s'\n", k5err, cc_name);
424 if ((code = krb5_cc_store_cred(context, ccache, &my_creds))) {
425 k5err = gssd_k5_err_msg(context, code);
426 printerr(0, "ERROR: %s while storing credentials in '%s'\n",
432 printerr(2, "Successfully obtained machine credentials for "
433 "principal '%s' stored in ccache '%s'\n", pname, cc_name);
435 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
437 krb5_get_init_creds_opt_free(context, init_opts);
440 k5_free_unparsed_name(context, pname);
442 krb5_cc_close(context, ccache);
443 krb5_free_cred_contents(context, &my_creds);
449 * Depending on the version of Kerberos, we either need to use
450 * a private function, or simply set the environment variable.
453 gssd_set_krb5_ccache_name(char *ccname)
455 #ifdef USE_GSS_KRB5_CCACHE_NAME
456 u_int maj_stat, min_stat;
458 printerr(2, "using gss_krb5_ccache_name to select krb5 ccache %s\n",
460 maj_stat = gss_krb5_ccache_name(&min_stat, ccname, NULL);
461 if (maj_stat != GSS_S_COMPLETE) {
462 printerr(0, "WARNING: gss_krb5_ccache_name with "
463 "name '%s' failed (%s)\n",
464 ccname, error_message(min_stat));
468 * Set the KRB5CCNAME environment variable to tell the krb5 code
469 * which credentials cache to use. (Instead of using the private
470 * function above for which there is no generic gssapi
473 printerr(2, "using environment variable to select krb5 ccache %s\n",
475 setenv("KRB5CCNAME", ccname, 1);
480 * Given a principal, find a matching ple structure
482 static struct gssd_k5_kt_princ *
483 find_ple_by_princ(krb5_context context, krb5_principal princ)
485 struct gssd_k5_kt_princ *ple;
487 for (ple = gssd_k5_kt_princ_list; ple != NULL; ple = ple->next) {
488 if (krb5_principal_compare(context, ple->princ, princ))
496 * Create, initialize, and add a new ple structure to the global list
498 static struct gssd_k5_kt_princ *
499 new_ple(krb5_context context, krb5_principal princ)
501 struct gssd_k5_kt_princ *ple = NULL, *p;
502 krb5_error_code code;
504 int is_default_realm = 0;
506 ple = malloc(sizeof(struct gssd_k5_kt_princ));
509 memset(ple, 0, sizeof(*ple));
512 ple->realm = strndup(princ->realm.data,
513 princ->realm.length);
515 ple->realm = strdup(princ->realm);
517 if (ple->realm == NULL)
519 code = krb5_copy_principal(context, princ, &ple->princ);
524 * Add new entry onto the list (if this is the default
525 * realm, always add to the front of the list)
528 code = krb5_get_default_realm(context, &default_realm);
530 if (strcmp(ple->realm, default_realm) == 0)
531 is_default_realm = 1;
532 k5_free_default_realm(context, default_realm);
535 if (is_default_realm) {
536 ple->next = gssd_k5_kt_princ_list;
537 gssd_k5_kt_princ_list = ple;
539 p = gssd_k5_kt_princ_list;
540 while (p != NULL && p->next != NULL)
543 gssd_k5_kt_princ_list = ple;
559 * Given a principal, find an existing ple structure, or create one
561 static struct gssd_k5_kt_princ *
562 get_ple_by_princ(krb5_context context, krb5_principal princ)
564 struct gssd_k5_kt_princ *ple;
566 /* Need to serialize list if we ever become multi-threaded! */
568 ple = find_ple_by_princ(context, princ);
570 ple = new_ple(context, princ);
577 * Given a (possibly unqualified) hostname,
578 * return the fully qualified (lower-case!) hostname
581 get_full_hostname(const char *inhost, char *outhost, int outhostlen)
583 struct addrinfo *addrs = NULL;
584 struct addrinfo hints;
588 memset(&hints, 0, sizeof(hints));
589 hints.ai_socktype = SOCK_STREAM;
590 hints.ai_family = PF_UNSPEC;
591 hints.ai_flags = AI_CANONNAME;
593 /* Get full target hostname */
594 retval = getaddrinfo(inhost, NULL, &hints, &addrs);
596 printerr(1, "%s while getting full hostname for '%s'\n",
597 gai_strerror(retval), inhost);
600 strncpy(outhost, addrs->ai_canonname, outhostlen);
602 for (c = outhost; *c != '\0'; c++)
605 printerr(3, "Full hostname for '%s' is '%s'\n", inhost, outhost);
612 * If principal matches the given realm and service name,
613 * and has *any* instance (hostname), return 1.
614 * Otherwise return 0, indicating no match.
618 realm_and_service_match(krb5_principal p, const char *realm, const char *service)
620 /* Must have two components */
624 if ((strlen(realm) == p->realm.length)
625 && (strncmp(realm, p->realm.data, p->realm.length) == 0)
626 && (strlen(service) == p->data[0].length)
627 && (strncmp(service, p->data[0].data, p->data[0].length) == 0))
634 realm_and_service_match(krb5_context context, krb5_principal p,
635 const char *realm, const char *service)
637 const char *name, *inst;
639 if (p->name.name_string.len != 2)
642 name = krb5_principal_get_comp_string(context, p, 0);
643 inst = krb5_principal_get_comp_string(context, p, 1);
644 if (name == NULL || inst == NULL)
646 if ((strcmp(realm, p->realm) == 0)
647 && (strcmp(service, name) == 0))
655 * Search the given keytab file looking for an entry with the given
656 * service name and realm, ignoring hostname (instance).
660 * non-zero => An error occurred
662 * If a keytab entry is found, "found" is set to one, and the keytab
663 * entry is returned in "kte". Otherwise, "found" is zero, and the
664 * value of "kte" is unpredictable.
667 gssd_search_krb5_keytab(krb5_context context, krb5_keytab kt,
668 const char *realm, const char *service,
669 int *found, krb5_keytab_entry *kte)
671 krb5_kt_cursor cursor;
672 krb5_error_code code;
673 struct gssd_k5_kt_princ *ple;
674 int retval = -1, status;
675 char kt_name[BUFSIZ];
686 * Look through each entry in the keytab file and determine
687 * if we might want to use it as machine credentials. If so,
688 * save info in the global principal list (gssd_k5_kt_princ_list).
690 if ((code = krb5_kt_get_name(context, kt, kt_name, BUFSIZ))) {
691 k5err = gssd_k5_err_msg(context, code);
692 printerr(0, "ERROR: %s attempting to get keytab name\n", k5err);
696 if ((code = krb5_kt_start_seq_get(context, kt, &cursor))) {
697 k5err = gssd_k5_err_msg(context, code);
698 printerr(0, "ERROR: %s while beginning keytab scan "
699 "for keytab '%s'\n", k5err, kt_name);
704 while ((code = krb5_kt_next_entry(context, kt, kte, &cursor)) == 0) {
705 if ((code = krb5_unparse_name(context, kte->principal,
707 k5err = gssd_k5_err_msg(context, code);
708 printerr(0, "WARNING: Skipping keytab entry because "
709 "we failed to unparse principal name: %s\n",
711 k5_free_kt_entry(context, kte);
714 printerr(4, "Processing keytab entry for principal '%s'\n",
716 /* Use the first matching keytab entry found */
718 status = realm_and_service_match(kte->principal, realm, service);
720 status = realm_and_service_match(context, kte->principal, realm, service);
723 printerr(4, "We WILL use this entry (%s)\n", pname);
724 ple = get_ple_by_princ(context, kte->principal);
726 * Return, don't free, keytab entry if
727 * we were successful!
731 k5_free_kt_entry(context, kte);
736 k5_free_unparsed_name(context, pname);
740 printerr(4, "We will NOT use this entry (%s)\n",
743 k5_free_unparsed_name(context, pname);
744 k5_free_kt_entry(context, kte);
747 if ((code = krb5_kt_end_seq_get(context, kt, &cursor))) {
748 k5err = gssd_k5_err_msg(context, code);
749 printerr(0, "WARNING: %s while ending keytab scan for "
750 "keytab '%s'\n", k5err, kt_name);
760 * Find a keytab entry to use for a given target hostname.
761 * Tries to find the most appropriate keytab to use given the
762 * name of the host we are trying to connect with.
765 find_keytab_entry(krb5_context context, krb5_keytab kt, const char *hostname,
766 krb5_keytab_entry *kte, const char **svcnames)
768 krb5_error_code code;
769 char **realmnames = NULL;
770 char myhostname[NI_MAXHOST], targethostname[NI_MAXHOST];
771 char myhostad[NI_MAXHOST+1];
773 char *default_realm = NULL;
776 int tried_all = 0, tried_default = 0;
777 krb5_principal princ;
780 /* Get full target hostname */
781 retval = get_full_hostname(hostname, targethostname,
782 sizeof(targethostname));
786 /* Get full local hostname */
787 retval = gethostname(myhostname, sizeof(myhostname));
789 k5err = gssd_k5_err_msg(context, retval);
790 printerr(1, "%s while getting local hostname\n", k5err);
794 /* Compute the active directory machine name HOST$ */
795 strcpy(myhostad, myhostname);
796 for (i = 0; myhostad[i] != 0; ++i)
797 myhostad[i] = toupper(myhostad[i]);
801 retval = get_full_hostname(myhostname, myhostname, sizeof(myhostname));
805 code = krb5_get_default_realm(context, &default_realm);
808 k5err = gssd_k5_err_msg(context, code);
809 printerr(1, "%s while getting default realm name\n", k5err);
814 * Get the realm name(s) for the target hostname.
815 * In reality, this function currently only returns a
816 * single realm, but we code with the assumption that
817 * someday it may actually return a list.
819 code = krb5_get_host_realm(context, targethostname, &realmnames);
821 k5err = gssd_k5_err_msg(context, code);
822 printerr(0, "ERROR: %s while getting realm(s) for host '%s'\n",
823 k5err, targethostname);
829 * Try the "appropriate" realm first, and if nothing found for that
830 * realm, try the default realm (if it hasn't already been tried).
833 realm = realmnames[i];
838 realm = default_realm;
840 if (tried_all && tried_default)
842 if (strcmp(realm, default_realm) == 0)
844 for (j = 0; svcnames[j] != NULL; j++) {
848 * The special svcname "$" means 'try the active
849 * directory machine account'
851 if (strcmp(svcnames[j],"$") == 0) {
852 snprintf(spn, sizeof(spn), "%s@%s", myhostad, realm);
853 code = krb5_build_principal_ext(context, &princ,
860 snprintf(spn, sizeof(spn), "%s/%s@%s",
861 svcnames[j], myhostname, realm);
862 code = krb5_build_principal_ext(context, &princ,
873 k5err = gssd_k5_err_msg(context, code);
874 printerr(1, "%s while building principal for '%s'\n",
878 code = krb5_kt_get_entry(context, kt, princ, 0, 0, kte);
879 krb5_free_principal(context, princ);
881 k5err = gssd_k5_err_msg(context, code);
882 printerr(3, "%s while getting keytab entry for '%s'\n",
885 printerr(3, "Success getting keytab entry for '%s'\n",spn);
892 * Nothing found with our hostname instance, now look for
893 * names with any instance (they must have an instance)
895 for (j = 0; svcnames[j] != NULL; j++) {
897 if (strcmp(svcnames[j],"$") == 0)
899 code = gssd_search_krb5_keytab(context, kt, realm,
900 svcnames[j], &found, kte);
901 if (!code && found) {
902 printerr(3, "Success getting keytab entry for "
903 "%s/*@%s\n", svcnames[j], realm);
910 realm = realmnames[i];
915 k5_free_default_realm(context, default_realm);
917 krb5_free_host_realm(context, realmnames);
923 static inline int data_is_equal(krb5_data d1, krb5_data d2)
925 return (d1.length == d2.length
926 && memcmp(d1.data, d2.data, d1.length) == 0);
930 check_for_tgt(krb5_context context, krb5_ccache ccache,
931 krb5_principal principal)
938 ret = krb5_cc_start_seq_get(context, ccache, &cur);
943 (ret = krb5_cc_next_cred(context, ccache, &cur, &creds)) == 0) {
944 if (creds.server->length == 2 &&
945 data_is_equal(creds.server->realm,
947 creds.server->data[0].length == 6 &&
948 memcmp(creds.server->data[0].data,
950 data_is_equal(creds.server->data[1],
952 creds.times.endtime > time(NULL))
954 krb5_free_cred_contents(context, &creds);
956 krb5_cc_end_seq_get(context, ccache, &cur);
962 query_krb5_ccache(const char* cred_cache, char **ret_princname,
966 krb5_context context;
968 krb5_principal principal;
973 ret = krb5_init_context(&context);
977 if(!cred_cache || krb5_cc_resolve(context, cred_cache, &ccache))
980 if (krb5_cc_set_flags(context, ccache, 0))
983 ret = krb5_cc_get_principal(context, ccache, &principal);
987 found = check_for_tgt(context, ccache, principal);
989 ret = krb5_unparse_name(context, principal, &princstring);
991 if ((str = strchr(princstring, '@')) != NULL) {
993 *ret_princname = strdup(princstring);
994 *ret_realm = strdup(str+1);
996 k5_free_unparsed_name(context, princstring);
1001 krb5_free_principal(context, principal);
1003 krb5_cc_set_flags(context, ccache, KRB5_TC_OPENCLOSE);
1004 krb5_cc_close(context, ccache);
1006 krb5_free_context(context);
1010 /*==========================*/
1011 /*=== External routines ===*/
1012 /*==========================*/
1015 * Attempt to find the best match for a credentials cache file
1016 * given only a UID. We really need more information, but we
1017 * do the best we can.
1019 * Returns 0 if a ccache was found, and a non-zero error code otherwise.
1022 gssd_setup_krb5_user_gss_ccache(uid_t uid, char *servername, char *dirname)
1024 char buf[MAX_NETOBJ_SZ];
1028 printerr(2, "getting credentials for client with uid %u for "
1029 "server %s\n", uid, servername);
1030 memset(buf, 0, sizeof(buf));
1031 err = gssd_find_existing_krb5_ccache(uid, dirname, &d);
1035 snprintf(buf, sizeof(buf), "FILE:%s/%s", dirname, d->d_name);
1038 printerr(2, "using %s as credentials cache for client with "
1039 "uid %u for server %s\n", buf, uid, servername);
1040 gssd_set_krb5_ccache_name(buf);
1045 * Let the gss code know where to find the machine credentials ccache.
1051 gssd_setup_krb5_machine_gss_ccache(char *ccname)
1053 printerr(2, "using %s as credentials cache for machine creds\n",
1055 gssd_set_krb5_ccache_name(ccname);
1059 * Return an array of pointers to names of credential cache files
1060 * which can be used to try to create gss contexts with a server.
1063 * 0 => list is attached
1067 gssd_get_krb5_machine_cred_list(char ***list)
1071 int listsize = listinc;
1074 struct gssd_k5_kt_princ *ple;
1076 /* Assume failure */
1078 *list = (char **) NULL;
1080 if ((l = (char **) malloc(listsize * sizeof(char *))) == NULL) {
1085 /* Need to serialize list if we ever become multi-threaded! */
1087 for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
1089 /* Make sure cred is up-to-date before returning it */
1090 retval = gssd_refresh_krb5_machine_credential(NULL, ple,
1094 if (i + 1 > listsize) {
1095 listsize += listinc;
1097 realloc(l, listsize * sizeof(char *));
1103 if ((l[i++] = strdup(ple->ccname)) == NULL) {
1120 * Frees the list of names returned in get_krb5_machine_cred_list()
1123 gssd_free_krb5_machine_cred_list(char **list)
1129 for (n = list; n && *n; n++) {
1136 * Called upon exit. Destroys machine credentials.
1139 gssd_destroy_krb5_machine_creds(void)
1141 krb5_context context;
1142 krb5_error_code code = 0;
1144 struct gssd_k5_kt_princ *ple;
1147 code = krb5_init_context(&context);
1149 k5err = gssd_k5_err_msg(NULL, code);
1150 printerr(0, "ERROR: %s while initializing krb5\n", k5err);
1154 for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
1157 if ((code = krb5_cc_resolve(context, ple->ccname, &ccache))) {
1158 k5err = gssd_k5_err_msg(context, code);
1159 printerr(0, "WARNING: %s while resolving credential "
1160 "cache '%s' for destruction\n", k5err,
1165 if ((code = krb5_cc_destroy(context, ccache))) {
1166 k5err = gssd_k5_err_msg(context, code);
1167 printerr(0, "WARNING: %s while destroying credential "
1168 "cache '%s'\n", k5err, ple->ccname);
1173 krb5_free_context(context);
1177 * Obtain (or refresh if necessary) Kerberos machine credentials
1180 gssd_refresh_krb5_machine_credential(char *hostname,
1181 struct gssd_k5_kt_princ *ple,
1184 krb5_error_code code = 0;
1185 krb5_context context;
1186 krb5_keytab kt = NULL;;
1189 const char *svcnames[5] = { "$", "root", "nfs", "host", NULL };
1192 * If a specific service name was specified, use it.
1193 * Otherwise, use the default list.
1195 if (service != NULL && strcmp(service, "*") != 0) {
1196 svcnames[0] = service;
1199 if (hostname == NULL && ple == NULL)
1202 code = krb5_init_context(&context);
1204 k5err = gssd_k5_err_msg(NULL, code);
1205 printerr(0, "ERROR: %s: %s while initializing krb5 context\n",
1211 if ((code = krb5_kt_resolve(context, keytabfile, &kt))) {
1212 k5err = gssd_k5_err_msg(context, code);
1213 printerr(0, "ERROR: %s: %s while resolving keytab '%s'\n",
1214 __func__, k5err, keytabfile);
1219 krb5_keytab_entry kte;
1221 code = find_keytab_entry(context, kt, hostname, &kte, svcnames);
1223 printerr(0, "ERROR: %s: no usable keytab entry found "
1224 "in keytab %s for connection with host %s\n",
1225 __FUNCTION__, keytabfile, hostname);
1230 ple = get_ple_by_princ(context, kte.principal);
1231 k5_free_kt_entry(context, &kte);
1234 if ((krb5_unparse_name(context, kte.principal, &pname))) {
1237 printerr(0, "ERROR: %s: Could not locate or create "
1238 "ple struct for principal %s for connection "
1240 __FUNCTION__, pname ? pname : "<unparsable>",
1242 if (pname) k5_free_unparsed_name(context, pname);
1246 retval = gssd_get_single_krb5_cred(context, kt, ple, 0);
1249 krb5_kt_close(context, kt);
1250 krb5_free_context(context);
1256 * A common routine for getting the Kerberos error message
1259 gssd_k5_err_msg(krb5_context context, krb5_error_code code)
1261 const char *origmsg;
1264 #if HAVE_KRB5_GET_ERROR_MESSAGE
1265 if (context != NULL) {
1266 origmsg = krb5_get_error_message(context, code);
1267 msg = strdup(origmsg);
1268 krb5_free_error_message(context, origmsg);
1274 return strdup(error_message(code));
1276 if (context != NULL)
1277 return strdup(krb5_get_err_text(context, code));
1279 return strdup(error_message(code));
1284 * Return default Kerberos realm
1287 gssd_k5_get_default_realm(char **def_realm)
1289 krb5_context context;
1291 if (krb5_init_context(&context))
1294 krb5_get_default_realm(context, def_realm);
1296 krb5_free_context(context);
1299 #ifdef HAVE_SET_ALLOWABLE_ENCTYPES
1301 * this routine obtains a credentials handle via gss_acquire_cred()
1302 * then calls gss_krb5_set_allowable_enctypes() to limit the encryption
1305 * XXX Should call some function to determine the enctypes supported
1306 * by the kernel. (Only need to do that once!)
1309 * 0 => all went well
1310 * -1 => there was an error
1314 limit_krb5_enctypes(struct rpc_gss_sec *sec)
1316 u_int maj_stat, min_stat;
1317 gss_cred_id_t credh;
1318 gss_OID_set_desc desired_mechs;
1319 krb5_enctype enctypes[] = { ENCTYPE_DES_CBC_CRC,
1320 ENCTYPE_DES_CBC_MD5,
1321 ENCTYPE_DES_CBC_MD4 };
1322 int num_enctypes = sizeof(enctypes) / sizeof(enctypes[0]);
1323 extern int num_krb5_enctypes;
1324 extern krb5_enctype *krb5_enctypes;
1326 /* We only care about getting a krb5 cred */
1327 desired_mechs.count = 1;
1328 desired_mechs.elements = &krb5oid;
1330 maj_stat = gss_acquire_cred(&min_stat, NULL, 0,
1331 &desired_mechs, GSS_C_INITIATE,
1332 &credh, NULL, NULL);
1334 if (maj_stat != GSS_S_COMPLETE) {
1335 if (get_verbosity() > 0)
1336 pgsserr("gss_acquire_cred",
1337 maj_stat, min_stat, &krb5oid);
1342 * If we failed for any reason to produce global
1343 * list of supported enctypes, use local default here.
1345 if (krb5_enctypes == NULL)
1346 maj_stat = gss_set_allowable_enctypes(&min_stat, credh,
1347 &krb5oid, num_enctypes, enctypes);
1349 maj_stat = gss_set_allowable_enctypes(&min_stat, credh,
1350 &krb5oid, num_krb5_enctypes, krb5_enctypes);
1352 if (maj_stat != GSS_S_COMPLETE) {
1353 pgsserr("gss_set_allowable_enctypes",
1354 maj_stat, min_stat, &krb5oid);
1355 gss_release_cred(&min_stat, &credh);
1362 #endif /* HAVE_SET_ALLOWABLE_ENCTYPES */