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 #ifdef HAVE_SET_ALLOWABLE_ENCTYPES
133 int limit_to_legacy_enctypes = 0;
136 /*==========================*/
137 /*=== Internal routines ===*/
138 /*==========================*/
140 static int select_krb5_ccache(const struct dirent *d);
141 static int gssd_find_existing_krb5_ccache(uid_t uid, char *dirname,
142 const char **cctype, struct dirent **d);
143 static int gssd_get_single_krb5_cred(krb5_context context,
144 krb5_keytab kt, struct gssd_k5_kt_princ *ple, int nocache);
145 static int query_krb5_ccache(const char* cred_cache, char **ret_princname,
149 * Called from the scandir function to weed out potential krb5
150 * credentials cache files
153 * 0 => don't select this one
154 * 1 => select this one
157 select_krb5_ccache(const struct dirent *d)
160 * Note: We used to check d->d_type for DT_REG here,
161 * but apparenlty reiser4 always has DT_UNKNOWN.
162 * Check for IS_REG after stat() call instead.
164 if (strstr(d->d_name, GSSD_DEFAULT_CRED_PREFIX))
171 * Look in directory "dirname" for files that look like they
172 * are Kerberos Credential Cache files for a given UID. Return
173 * non-zero and the dirent pointer for the entry most likely to be
174 * what we want. Otherwise, return zero and no dirent pointer.
175 * The caller is responsible for freeing the dirent if one is returned.
177 * Returns 0 if a valid-looking entry was found and a non-zero error
181 gssd_find_existing_krb5_ccache(uid_t uid, char *dirname,
182 const char **cctype, struct dirent **d)
184 struct dirent **namelist;
188 struct dirent *best_match_dir = NULL;
189 struct stat best_match_stat, tmp_stat;
191 char *princname = NULL;
193 int score, best_match_score = 0, err = -EACCES;
195 memset(&best_match_stat, 0, sizeof(best_match_stat));
198 n = scandir(dirname, &namelist, select_krb5_ccache, 0);
200 printerr(1, "Error doing scandir on directory '%s': %s\n",
201 dirname, strerror(errno));
205 for (i = 0; i < n; i++) {
206 snprintf(statname, sizeof(statname),
207 "%s/%s", dirname, namelist[i]->d_name);
208 printerr(3, "CC '%s' being considered, "
209 "with preferred realm '%s'\n",
210 statname, preferred_realm ?
211 preferred_realm : "<none selected>");
212 if (lstat(statname, &tmp_stat)) {
213 printerr(0, "Error doing stat on '%s'\n",
218 /* Only pick caches owned by the user (uid) */
219 if (tmp_stat.st_uid != uid) {
220 printerr(3, "CC '%s' owned by %u, not %u\n",
221 statname, tmp_stat.st_uid, uid);
225 if (!S_ISREG(tmp_stat.st_mode) &&
226 !S_ISDIR(tmp_stat.st_mode)) {
227 printerr(3, "CC '%s' is not a regular "
228 "file or directory\n",
233 if (uid == 0 && !root_uses_machine_creds &&
234 strstr(namelist[i]->d_name, "_machine_")) {
235 printerr(3, "CC '%s' not available to root\n",
240 if (S_ISDIR(tmp_stat.st_mode)) {
243 if (S_ISREG(tmp_stat.st_mode)) {
248 snprintf(buf, sizeof(buf), "%s:%s/%s", *cctype,
249 dirname, namelist[i]->d_name);
250 if (!query_krb5_ccache(buf, &princname, &realm)) {
251 printerr(3, "CC '%s' is expired or corrupt\n",
259 if (preferred_realm &&
260 strcmp(realm, preferred_realm) == 0)
263 printerr(3, "CC '%s'(%s@%s) passed all checks and"
264 " has mtime of %u\n",
265 buf, princname, realm,
268 * if more than one match is found, return the most
269 * recent (the one with the latest mtime), and
270 * don't free the dirent
273 best_match_dir = namelist[i];
274 best_match_stat = tmp_stat;
275 best_match_score = score;
280 * If current score is higher than best match
281 * score, we use the current match. Otherwise,
282 * if the current match has an mtime later
283 * than the one we are looking at, then use
284 * the current match. Otherwise, we still
285 * have the best match.
287 if (best_match_score < score ||
288 (best_match_score == score &&
290 best_match_stat.st_mtime)) {
291 free(best_match_dir);
292 best_match_dir = namelist[i];
293 best_match_stat = tmp_stat;
294 best_match_score = score;
299 printerr(3, "CC '%s:%s/%s' is our "
300 "current best match "
301 "with mtime of %u\n",
303 best_match_dir->d_name,
304 best_match_stat.st_mtime);
320 * Obtain credentials via a key in the keytab given
321 * a keytab handle and a gssd_k5_kt_princ structure.
322 * Checks to see if current credentials are expired,
323 * if not, uses the keytab to obtain new credentials.
326 * 0 => success (or credentials have not expired)
330 gssd_get_single_krb5_cred(krb5_context context,
332 struct gssd_k5_kt_princ *ple,
335 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
336 krb5_get_init_creds_opt *init_opts = NULL;
338 krb5_get_init_creds_opt options;
340 krb5_get_init_creds_opt *opts;
342 krb5_ccache ccache = NULL;
343 char kt_name[BUFSIZ];
344 char cc_name[BUFSIZ];
346 time_t now = time(0);
351 memset(&my_creds, 0, sizeof(my_creds));
353 if (ple->ccname && ple->endtime > now && !nocache) {
354 printerr(2, "INFO: Credentials in CC '%s' are good until %d\n",
355 ple->ccname, ple->endtime);
360 if ((code = krb5_kt_get_name(context, kt, kt_name, BUFSIZ))) {
361 printerr(0, "ERROR: Unable to get keytab name in "
362 "gssd_get_single_krb5_cred\n");
366 if ((krb5_unparse_name(context, ple->princ, &pname)))
369 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
370 code = krb5_get_init_creds_opt_alloc(context, &init_opts);
372 k5err = gssd_k5_err_msg(context, code);
373 printerr(0, "ERROR: %s allocating gic options\n", k5err);
376 if (krb5_get_init_creds_opt_set_addressless(context, init_opts, 1))
377 printerr(1, "WARNING: Unable to set option for addressless "
378 "tickets. May have problems behind a NAT.\n");
379 #ifdef TEST_SHORT_LIFETIME
380 /* set a short lifetime (for debugging only!) */
381 printerr(0, "WARNING: Using (debug) short machine cred lifetime!\n");
382 krb5_get_init_creds_opt_set_tkt_life(init_opts, 5*60);
386 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS */
388 krb5_get_init_creds_opt_init(&options);
389 krb5_get_init_creds_opt_set_address_list(&options, NULL);
390 #ifdef TEST_SHORT_LIFETIME
391 /* set a short lifetime (for debugging only!) */
392 printerr(0, "WARNING: Using (debug) short machine cred lifetime!\n");
393 krb5_get_init_creds_opt_set_tkt_life(&options, 5*60);
398 if ((code = krb5_get_init_creds_keytab(context, &my_creds, ple->princ,
399 kt, 0, NULL, opts))) {
400 k5err = gssd_k5_err_msg(context, code);
401 printerr(1, "WARNING: %s while getting initial ticket for "
402 "principal '%s' using keytab '%s'\n", k5err,
403 pname ? pname : "<unparsable>", kt_name);
408 * Initialize cache file which we're going to be using
412 cache_type = "MEMORY";
415 snprintf(cc_name, sizeof(cc_name), "%s:%s/%s%s_%s",
417 ccachesearch[0], GSSD_DEFAULT_CRED_PREFIX,
418 GSSD_DEFAULT_MACHINE_CRED_SUFFIX, ple->realm);
419 ple->endtime = my_creds.times.endtime;
420 if (ple->ccname != NULL)
422 ple->ccname = strdup(cc_name);
423 if (ple->ccname == NULL) {
424 printerr(0, "ERROR: no storage to duplicate credentials "
425 "cache name '%s'\n", cc_name);
429 if ((code = krb5_cc_resolve(context, cc_name, &ccache))) {
430 k5err = gssd_k5_err_msg(context, code);
431 printerr(0, "ERROR: %s while opening credential cache '%s'\n",
435 if ((code = krb5_cc_initialize(context, ccache, ple->princ))) {
436 k5err = gssd_k5_err_msg(context, code);
437 printerr(0, "ERROR: %s while initializing credential "
438 "cache '%s'\n", k5err, cc_name);
441 if ((code = krb5_cc_store_cred(context, ccache, &my_creds))) {
442 k5err = gssd_k5_err_msg(context, code);
443 printerr(0, "ERROR: %s while storing credentials in '%s'\n",
449 printerr(2, "Successfully obtained machine credentials for "
450 "principal '%s' stored in ccache '%s'\n", pname, cc_name);
452 #if HAVE_KRB5_GET_INIT_CREDS_OPT_SET_ADDRESSLESS
454 krb5_get_init_creds_opt_free(context, init_opts);
457 k5_free_unparsed_name(context, pname);
459 krb5_cc_close(context, ccache);
460 krb5_free_cred_contents(context, &my_creds);
466 * Depending on the version of Kerberos, we either need to use
467 * a private function, or simply set the environment variable.
470 gssd_set_krb5_ccache_name(char *ccname)
472 #ifdef USE_GSS_KRB5_CCACHE_NAME
473 u_int maj_stat, min_stat;
475 printerr(2, "using gss_krb5_ccache_name to select krb5 ccache %s\n",
477 maj_stat = gss_krb5_ccache_name(&min_stat, ccname, NULL);
478 if (maj_stat != GSS_S_COMPLETE) {
479 printerr(0, "WARNING: gss_krb5_ccache_name with "
480 "name '%s' failed (%s)\n",
481 ccname, error_message(min_stat));
485 * Set the KRB5CCNAME environment variable to tell the krb5 code
486 * which credentials cache to use. (Instead of using the private
487 * function above for which there is no generic gssapi
490 printerr(2, "using environment variable to select krb5 ccache %s\n",
492 setenv("KRB5CCNAME", ccname, 1);
497 * Given a principal, find a matching ple structure
499 static struct gssd_k5_kt_princ *
500 find_ple_by_princ(krb5_context context, krb5_principal princ)
502 struct gssd_k5_kt_princ *ple;
504 for (ple = gssd_k5_kt_princ_list; ple != NULL; ple = ple->next) {
505 if (krb5_principal_compare(context, ple->princ, princ))
513 * Create, initialize, and add a new ple structure to the global list
515 static struct gssd_k5_kt_princ *
516 new_ple(krb5_context context, krb5_principal princ)
518 struct gssd_k5_kt_princ *ple = NULL, *p;
519 krb5_error_code code;
521 int is_default_realm = 0;
523 ple = malloc(sizeof(struct gssd_k5_kt_princ));
526 memset(ple, 0, sizeof(*ple));
529 ple->realm = strndup(princ->realm.data,
530 princ->realm.length);
532 ple->realm = strdup(princ->realm);
534 if (ple->realm == NULL)
536 code = krb5_copy_principal(context, princ, &ple->princ);
541 * Add new entry onto the list (if this is the default
542 * realm, always add to the front of the list)
545 code = krb5_get_default_realm(context, &default_realm);
547 if (strcmp(ple->realm, default_realm) == 0)
548 is_default_realm = 1;
549 k5_free_default_realm(context, default_realm);
552 if (is_default_realm) {
553 ple->next = gssd_k5_kt_princ_list;
554 gssd_k5_kt_princ_list = ple;
556 p = gssd_k5_kt_princ_list;
557 while (p != NULL && p->next != NULL)
560 gssd_k5_kt_princ_list = ple;
576 * Given a principal, find an existing ple structure, or create one
578 static struct gssd_k5_kt_princ *
579 get_ple_by_princ(krb5_context context, krb5_principal princ)
581 struct gssd_k5_kt_princ *ple;
583 /* Need to serialize list if we ever become multi-threaded! */
585 ple = find_ple_by_princ(context, princ);
587 ple = new_ple(context, princ);
594 * Given a (possibly unqualified) hostname,
595 * return the fully qualified (lower-case!) hostname
598 get_full_hostname(const char *inhost, char *outhost, int outhostlen)
600 struct addrinfo *addrs = NULL;
601 struct addrinfo hints;
605 memset(&hints, 0, sizeof(hints));
606 hints.ai_socktype = SOCK_STREAM;
607 hints.ai_family = PF_UNSPEC;
608 hints.ai_flags = AI_CANONNAME;
610 /* Get full target hostname */
611 retval = getaddrinfo(inhost, NULL, &hints, &addrs);
613 printerr(1, "%s while getting full hostname for '%s'\n",
614 gai_strerror(retval), inhost);
617 strncpy(outhost, addrs->ai_canonname, outhostlen);
619 for (c = outhost; *c != '\0'; c++)
622 printerr(3, "Full hostname for '%s' is '%s'\n", inhost, outhost);
629 * If principal matches the given realm and service name,
630 * and has *any* instance (hostname), return 1.
631 * Otherwise return 0, indicating no match.
635 realm_and_service_match(krb5_principal p, const char *realm, const char *service)
637 /* Must have two components */
641 if ((strlen(realm) == p->realm.length)
642 && (strncmp(realm, p->realm.data, p->realm.length) == 0)
643 && (strlen(service) == p->data[0].length)
644 && (strncmp(service, p->data[0].data, p->data[0].length) == 0))
651 realm_and_service_match(krb5_context context, krb5_principal p,
652 const char *realm, const char *service)
654 const char *name, *inst;
656 if (p->name.name_string.len != 2)
659 name = krb5_principal_get_comp_string(context, p, 0);
660 inst = krb5_principal_get_comp_string(context, p, 1);
661 if (name == NULL || inst == NULL)
663 if ((strcmp(realm, p->realm) == 0)
664 && (strcmp(service, name) == 0))
672 * Search the given keytab file looking for an entry with the given
673 * service name and realm, ignoring hostname (instance).
677 * non-zero => An error occurred
679 * If a keytab entry is found, "found" is set to one, and the keytab
680 * entry is returned in "kte". Otherwise, "found" is zero, and the
681 * value of "kte" is unpredictable.
684 gssd_search_krb5_keytab(krb5_context context, krb5_keytab kt,
685 const char *realm, const char *service,
686 int *found, krb5_keytab_entry *kte)
688 krb5_kt_cursor cursor;
689 krb5_error_code code;
690 struct gssd_k5_kt_princ *ple;
691 int retval = -1, status;
692 char kt_name[BUFSIZ];
703 * Look through each entry in the keytab file and determine
704 * if we might want to use it as machine credentials. If so,
705 * save info in the global principal list (gssd_k5_kt_princ_list).
707 if ((code = krb5_kt_get_name(context, kt, kt_name, BUFSIZ))) {
708 k5err = gssd_k5_err_msg(context, code);
709 printerr(0, "ERROR: %s attempting to get keytab name\n", k5err);
713 if ((code = krb5_kt_start_seq_get(context, kt, &cursor))) {
714 k5err = gssd_k5_err_msg(context, code);
715 printerr(0, "ERROR: %s while beginning keytab scan "
716 "for keytab '%s'\n", k5err, kt_name);
721 while ((code = krb5_kt_next_entry(context, kt, kte, &cursor)) == 0) {
722 if ((code = krb5_unparse_name(context, kte->principal,
724 k5err = gssd_k5_err_msg(context, code);
725 printerr(0, "WARNING: Skipping keytab entry because "
726 "we failed to unparse principal name: %s\n",
728 k5_free_kt_entry(context, kte);
731 printerr(4, "Processing keytab entry for principal '%s'\n",
733 /* Use the first matching keytab entry found */
735 status = realm_and_service_match(kte->principal, realm, service);
737 status = realm_and_service_match(context, kte->principal, realm, service);
740 printerr(4, "We WILL use this entry (%s)\n", pname);
741 ple = get_ple_by_princ(context, kte->principal);
743 * Return, don't free, keytab entry if
744 * we were successful!
748 k5_free_kt_entry(context, kte);
753 k5_free_unparsed_name(context, pname);
757 printerr(4, "We will NOT use this entry (%s)\n",
760 k5_free_unparsed_name(context, pname);
761 k5_free_kt_entry(context, kte);
764 if ((code = krb5_kt_end_seq_get(context, kt, &cursor))) {
765 k5err = gssd_k5_err_msg(context, code);
766 printerr(0, "WARNING: %s while ending keytab scan for "
767 "keytab '%s'\n", k5err, kt_name);
777 * Find a keytab entry to use for a given target hostname.
778 * Tries to find the most appropriate keytab to use given the
779 * name of the host we are trying to connect with.
782 find_keytab_entry(krb5_context context, krb5_keytab kt, const char *hostname,
783 krb5_keytab_entry *kte, const char **svcnames)
785 krb5_error_code code;
786 char **realmnames = NULL;
787 char myhostname[NI_MAXHOST], targethostname[NI_MAXHOST];
788 char myhostad[NI_MAXHOST+1];
790 char *default_realm = NULL;
793 int tried_all = 0, tried_default = 0;
794 krb5_principal princ;
797 /* Get full target hostname */
798 retval = get_full_hostname(hostname, targethostname,
799 sizeof(targethostname));
803 /* Get full local hostname */
804 retval = gethostname(myhostname, sizeof(myhostname));
806 k5err = gssd_k5_err_msg(context, retval);
807 printerr(1, "%s while getting local hostname\n", k5err);
811 /* Compute the active directory machine name HOST$ */
812 strcpy(myhostad, myhostname);
813 for (i = 0; myhostad[i] != 0; ++i)
814 myhostad[i] = toupper(myhostad[i]);
818 retval = get_full_hostname(myhostname, myhostname, sizeof(myhostname));
822 code = krb5_get_default_realm(context, &default_realm);
825 k5err = gssd_k5_err_msg(context, code);
826 printerr(1, "%s while getting default realm name\n", k5err);
831 * Get the realm name(s) for the target hostname.
832 * In reality, this function currently only returns a
833 * single realm, but we code with the assumption that
834 * someday it may actually return a list.
836 code = krb5_get_host_realm(context, targethostname, &realmnames);
838 k5err = gssd_k5_err_msg(context, code);
839 printerr(0, "ERROR: %s while getting realm(s) for host '%s'\n",
840 k5err, targethostname);
846 * Try the "appropriate" realm first, and if nothing found for that
847 * realm, try the default realm (if it hasn't already been tried).
850 realm = realmnames[i];
855 realm = default_realm;
857 if (tried_all && tried_default)
859 if (strcmp(realm, default_realm) == 0)
861 for (j = 0; svcnames[j] != NULL; j++) {
865 * The special svcname "$" means 'try the active
866 * directory machine account'
868 if (strcmp(svcnames[j],"$") == 0) {
869 snprintf(spn, sizeof(spn), "%s@%s", myhostad, realm);
870 code = krb5_build_principal_ext(context, &princ,
877 snprintf(spn, sizeof(spn), "%s/%s@%s",
878 svcnames[j], myhostname, realm);
879 code = krb5_build_principal_ext(context, &princ,
890 k5err = gssd_k5_err_msg(context, code);
891 printerr(1, "%s while building principal for '%s'\n",
895 code = krb5_kt_get_entry(context, kt, princ, 0, 0, kte);
896 krb5_free_principal(context, princ);
898 k5err = gssd_k5_err_msg(context, code);
899 printerr(3, "%s while getting keytab entry for '%s'\n",
902 printerr(3, "Success getting keytab entry for '%s'\n",spn);
909 * Nothing found with our hostname instance, now look for
910 * names with any instance (they must have an instance)
912 for (j = 0; svcnames[j] != NULL; j++) {
914 if (strcmp(svcnames[j],"$") == 0)
916 code = gssd_search_krb5_keytab(context, kt, realm,
917 svcnames[j], &found, kte);
918 if (!code && found) {
919 printerr(3, "Success getting keytab entry for "
920 "%s/*@%s\n", svcnames[j], realm);
927 realm = realmnames[i];
932 k5_free_default_realm(context, default_realm);
934 krb5_free_host_realm(context, realmnames);
940 static inline int data_is_equal(krb5_data d1, krb5_data d2)
942 return (d1.length == d2.length
943 && memcmp(d1.data, d2.data, d1.length) == 0);
947 check_for_tgt(krb5_context context, krb5_ccache ccache,
948 krb5_principal principal)
955 ret = krb5_cc_start_seq_get(context, ccache, &cur);
960 (ret = krb5_cc_next_cred(context, ccache, &cur, &creds)) == 0) {
961 if (creds.server->length == 2 &&
962 data_is_equal(creds.server->realm,
964 creds.server->data[0].length == 6 &&
965 memcmp(creds.server->data[0].data,
967 data_is_equal(creds.server->data[1],
969 creds.times.endtime > time(NULL))
971 krb5_free_cred_contents(context, &creds);
973 krb5_cc_end_seq_get(context, ccache, &cur);
979 query_krb5_ccache(const char* cred_cache, char **ret_princname,
983 krb5_context context;
985 krb5_principal principal;
990 ret = krb5_init_context(&context);
994 if(!cred_cache || krb5_cc_resolve(context, cred_cache, &ccache))
997 if (krb5_cc_set_flags(context, ccache, 0))
1000 ret = krb5_cc_get_principal(context, ccache, &principal);
1004 found = check_for_tgt(context, ccache, principal);
1006 ret = krb5_unparse_name(context, principal, &princstring);
1008 if ((str = strchr(princstring, '@')) != NULL) {
1010 *ret_princname = strdup(princstring);
1011 *ret_realm = strdup(str+1);
1013 k5_free_unparsed_name(context, princstring);
1018 krb5_free_principal(context, principal);
1020 krb5_cc_set_flags(context, ccache, KRB5_TC_OPENCLOSE);
1021 krb5_cc_close(context, ccache);
1023 krb5_free_context(context);
1027 /*==========================*/
1028 /*=== External routines ===*/
1029 /*==========================*/
1032 * Attempt to find the best match for a credentials cache file
1033 * given only a UID. We really need more information, but we
1034 * do the best we can.
1036 * Returns 0 if a ccache was found, and a non-zero error code otherwise.
1039 gssd_setup_krb5_user_gss_ccache(uid_t uid, char *servername, char *dirpattern)
1041 char buf[MAX_NETOBJ_SZ], dirname[PATH_MAX];
1046 printerr(2, "getting credentials for client with uid %u for "
1047 "server %s\n", uid, servername);
1049 for (i = 0, j = 0; dirpattern[i] != '\0'; i++) {
1050 switch (dirpattern[i]) {
1052 switch (dirpattern[i + 1]) {
1054 dirname[j++] = dirpattern[i];
1058 j += sprintf(dirname + j, "%lu",
1059 (unsigned long) uid);
1065 dirname[j++] = dirpattern[i];
1071 err = gssd_find_existing_krb5_ccache(uid, dirname, &cctype, &d);
1075 snprintf(buf, sizeof(buf), "%s:%s/%s", cctype, dirname, d->d_name);
1078 printerr(2, "using %s as credentials cache for client with "
1079 "uid %u for server %s\n", buf, uid, servername);
1080 gssd_set_krb5_ccache_name(buf);
1085 * Let the gss code know where to find the machine credentials ccache.
1091 gssd_setup_krb5_machine_gss_ccache(char *ccname)
1093 printerr(2, "using %s as credentials cache for machine creds\n",
1095 gssd_set_krb5_ccache_name(ccname);
1099 * Return an array of pointers to names of credential cache files
1100 * which can be used to try to create gss contexts with a server.
1103 * 0 => list is attached
1107 gssd_get_krb5_machine_cred_list(char ***list)
1111 int listsize = listinc;
1114 struct gssd_k5_kt_princ *ple;
1116 /* Assume failure */
1118 *list = (char **) NULL;
1120 if ((l = (char **) malloc(listsize * sizeof(char *))) == NULL) {
1125 /* Need to serialize list if we ever become multi-threaded! */
1127 for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
1129 /* Make sure cred is up-to-date before returning it */
1130 retval = gssd_refresh_krb5_machine_credential(NULL, ple,
1134 if (i + 1 > listsize) {
1135 listsize += listinc;
1137 realloc(l, listsize * sizeof(char *));
1143 if ((l[i++] = strdup(ple->ccname)) == NULL) {
1160 * Frees the list of names returned in get_krb5_machine_cred_list()
1163 gssd_free_krb5_machine_cred_list(char **list)
1169 for (n = list; n && *n; n++) {
1176 * Called upon exit. Destroys machine credentials.
1179 gssd_destroy_krb5_machine_creds(void)
1181 krb5_context context;
1182 krb5_error_code code = 0;
1184 struct gssd_k5_kt_princ *ple;
1187 code = krb5_init_context(&context);
1189 k5err = gssd_k5_err_msg(NULL, code);
1190 printerr(0, "ERROR: %s while initializing krb5\n", k5err);
1194 for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
1197 if ((code = krb5_cc_resolve(context, ple->ccname, &ccache))) {
1198 k5err = gssd_k5_err_msg(context, code);
1199 printerr(0, "WARNING: %s while resolving credential "
1200 "cache '%s' for destruction\n", k5err,
1205 if ((code = krb5_cc_destroy(context, ccache))) {
1206 k5err = gssd_k5_err_msg(context, code);
1207 printerr(0, "WARNING: %s while destroying credential "
1208 "cache '%s'\n", k5err, ple->ccname);
1213 krb5_free_context(context);
1217 * Obtain (or refresh if necessary) Kerberos machine credentials
1220 gssd_refresh_krb5_machine_credential(char *hostname,
1221 struct gssd_k5_kt_princ *ple,
1224 krb5_error_code code = 0;
1225 krb5_context context;
1226 krb5_keytab kt = NULL;;
1229 const char *svcnames[5] = { "$", "root", "nfs", "host", NULL };
1232 * If a specific service name was specified, use it.
1233 * Otherwise, use the default list.
1235 if (service != NULL && strcmp(service, "*") != 0) {
1236 svcnames[0] = service;
1239 if (hostname == NULL && ple == NULL)
1242 code = krb5_init_context(&context);
1244 k5err = gssd_k5_err_msg(NULL, code);
1245 printerr(0, "ERROR: %s: %s while initializing krb5 context\n",
1251 if ((code = krb5_kt_resolve(context, keytabfile, &kt))) {
1252 k5err = gssd_k5_err_msg(context, code);
1253 printerr(0, "ERROR: %s: %s while resolving keytab '%s'\n",
1254 __func__, k5err, keytabfile);
1259 krb5_keytab_entry kte;
1261 code = find_keytab_entry(context, kt, hostname, &kte, svcnames);
1263 printerr(0, "ERROR: %s: no usable keytab entry found "
1264 "in keytab %s for connection with host %s\n",
1265 __FUNCTION__, keytabfile, hostname);
1270 ple = get_ple_by_princ(context, kte.principal);
1271 k5_free_kt_entry(context, &kte);
1274 if ((krb5_unparse_name(context, kte.principal, &pname))) {
1277 printerr(0, "ERROR: %s: Could not locate or create "
1278 "ple struct for principal %s for connection "
1280 __FUNCTION__, pname ? pname : "<unparsable>",
1282 if (pname) k5_free_unparsed_name(context, pname);
1286 retval = gssd_get_single_krb5_cred(context, kt, ple, 0);
1289 krb5_kt_close(context, kt);
1290 krb5_free_context(context);
1296 * A common routine for getting the Kerberos error message
1299 gssd_k5_err_msg(krb5_context context, krb5_error_code code)
1301 const char *origmsg;
1304 #if HAVE_KRB5_GET_ERROR_MESSAGE
1305 if (context != NULL) {
1306 origmsg = krb5_get_error_message(context, code);
1307 msg = strdup(origmsg);
1308 krb5_free_error_message(context, origmsg);
1314 return strdup(error_message(code));
1316 if (context != NULL)
1317 return strdup(krb5_get_err_text(context, code));
1319 return strdup(error_message(code));
1324 * Return default Kerberos realm
1327 gssd_k5_get_default_realm(char **def_realm)
1329 krb5_context context;
1331 if (krb5_init_context(&context))
1334 krb5_get_default_realm(context, def_realm);
1336 krb5_free_context(context);
1339 #ifdef HAVE_SET_ALLOWABLE_ENCTYPES
1341 * this routine obtains a credentials handle via gss_acquire_cred()
1342 * then calls gss_krb5_set_allowable_enctypes() to limit the encryption
1345 * XXX Should call some function to determine the enctypes supported
1346 * by the kernel. (Only need to do that once!)
1349 * 0 => all went well
1350 * -1 => there was an error
1354 limit_krb5_enctypes(struct rpc_gss_sec *sec)
1356 u_int maj_stat, min_stat;
1357 gss_cred_id_t credh;
1358 gss_OID_set_desc desired_mechs;
1359 krb5_enctype enctypes[] = { ENCTYPE_DES_CBC_CRC,
1360 ENCTYPE_DES_CBC_MD5,
1361 ENCTYPE_DES_CBC_MD4 };
1362 int num_enctypes = sizeof(enctypes) / sizeof(enctypes[0]);
1363 extern int num_krb5_enctypes;
1364 extern krb5_enctype *krb5_enctypes;
1366 /* We only care about getting a krb5 cred */
1367 desired_mechs.count = 1;
1368 desired_mechs.elements = &krb5oid;
1370 maj_stat = gss_acquire_cred(&min_stat, NULL, 0,
1371 &desired_mechs, GSS_C_INITIATE,
1372 &credh, NULL, NULL);
1374 if (maj_stat != GSS_S_COMPLETE) {
1375 if (get_verbosity() > 0)
1376 pgsserr("gss_acquire_cred",
1377 maj_stat, min_stat, &krb5oid);
1382 * If we failed for any reason to produce global
1383 * list of supported enctypes, use local default here.
1385 if (krb5_enctypes == NULL || limit_to_legacy_enctypes)
1386 maj_stat = gss_set_allowable_enctypes(&min_stat, credh,
1387 &krb5oid, num_enctypes, enctypes);
1389 maj_stat = gss_set_allowable_enctypes(&min_stat, credh,
1390 &krb5oid, num_krb5_enctypes, krb5_enctypes);
1392 if (maj_stat != GSS_S_COMPLETE) {
1393 pgsserr("gss_set_allowable_enctypes",
1394 maj_stat, min_stat, &krb5oid);
1395 gss_release_cred(&min_stat, &credh);
1402 #endif /* HAVE_SET_ALLOWABLE_ENCTYPES */