2 Unix SMB/CIFS implementation.
3 kerberos utility library
4 Copyright (C) Andrew Tridgell 2001
5 Copyright (C) Remus Koos 2001
6 Copyright (C) Nalin Dahyabhai <nalin@redhat.com> 2004.
7 Copyright (C) Jeremy Allison 2004.
8 Copyright (C) Gerald Carter 2006.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
25 #include "libsmb/namequery.h"
26 #include "system/filesys.h"
28 #include "../librpc/gen_ndr/ndr_misc.h"
29 #include "libads/kerberos_proto.h"
30 #include "libads/cldap.h"
32 #include "../lib/tsocket/tsocket.h"
33 #include "lib/util/asn1.h"
37 #define LIBADS_CCACHE_NAME "MEMORY:libads"
40 we use a prompter to avoid a crash bug in the kerberos libs when
41 dealing with empty passwords
42 this prompter is just a string copy ...
44 static krb5_error_code
45 kerb_prompter(krb5_context ctx, void *data,
49 krb5_prompt prompts[])
51 if (num_prompts == 0) return 0;
52 if (num_prompts == 2) {
54 * only heimdal has a prompt type and we need to deal with it here to
57 * removing the prompter completely is not an option as at least these
58 * versions would crash: heimdal-1.0.2 and heimdal-1.1. Later heimdal
59 * version have looping detection and return with a proper error code.
62 #if HAVE_KRB5_PROMPT_TYPE /* Heimdal */
63 if (prompts[0].type == KRB5_PROMPT_TYPE_NEW_PASSWORD &&
64 prompts[1].type == KRB5_PROMPT_TYPE_NEW_PASSWORD_AGAIN) {
66 * We don't want to change passwords here. We're
67 * called from heimal when the KDC returns
68 * KRB5KDC_ERR_KEY_EXPIRED, but at this point we don't
69 * have the chance to ask the user for a new
70 * password. If we return 0 (i.e. success), we will be
71 * spinning in the endless for-loop in
72 * change_password() in
73 * source4/heimdal/lib/krb5/init_creds_pw.c:526ff
75 return KRB5KDC_ERR_KEY_EXPIRED;
77 #elif defined(HAVE_KRB5_GET_PROMPT_TYPES) /* MIT */
78 krb5_prompt_type *prompt_types = NULL;
80 prompt_types = krb5_get_prompt_types(ctx);
81 if (prompt_types != NULL) {
82 if (prompt_types[0] == KRB5_PROMPT_TYPE_NEW_PASSWORD &&
83 prompt_types[1] == KRB5_PROMPT_TYPE_NEW_PASSWORD_AGAIN) {
84 return KRB5KDC_ERR_KEY_EXP;
90 memset(prompts[0].reply->data, '\0', prompts[0].reply->length);
91 if (prompts[0].reply->length > 0) {
93 strncpy((char *)prompts[0].reply->data, (const char *)data,
94 prompts[0].reply->length-1);
95 prompts[0].reply->length = strlen((const char *)prompts[0].reply->data);
97 prompts[0].reply->length = 0;
104 simulate a kinit, putting the tgt in the given cache location. If cache_name == NULL
105 place in default cache location.
108 int kerberos_kinit_password_ext(const char *principal,
109 const char *password,
112 time_t *renew_till_time,
113 const char *cache_name,
115 bool add_netbios_addr,
116 time_t renewable_time,
119 krb5_context ctx = NULL;
120 krb5_error_code code = 0;
121 krb5_ccache cc = NULL;
122 krb5_principal me = NULL;
123 krb5_principal canon_princ = NULL;
125 krb5_get_init_creds_opt *opt = NULL;
126 smb_krb5_addresses *addr = NULL;
128 ZERO_STRUCT(my_creds);
130 initialize_krb5_error_table();
131 if ((code = krb5_init_context(&ctx)))
134 if (time_offset != 0) {
135 krb5_set_real_time(ctx, time(NULL) + time_offset, 0);
138 DEBUG(10,("kerberos_kinit_password: as %s using [%s] as ccache and config [%s]\n",
140 cache_name ? cache_name: krb5_cc_default_name(ctx),
141 getenv("KRB5_CONFIG")));
143 if ((code = krb5_cc_resolve(ctx, cache_name ? cache_name : krb5_cc_default_name(ctx), &cc))) {
147 if ((code = smb_krb5_parse_name(ctx, principal, &me))) {
151 if ((code = krb5_get_init_creds_opt_alloc(ctx, &opt))) {
155 krb5_get_init_creds_opt_set_renew_life(opt, renewable_time);
156 krb5_get_init_creds_opt_set_forwardable(opt, True);
158 /* Turn on canonicalization for lower case realm support */
159 #ifndef SAMBA4_USES_HEIMDAL /* MIT */
160 krb5_get_init_creds_opt_set_canonicalize(opt, true);
164 krb5_get_init_creds_opt_set_tkt_life(opt, 60);
167 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_SET_PAC_REQUEST
169 if ((code = krb5_get_init_creds_opt_set_pac_request(ctx, opt, (krb5_boolean)request_pac))) {
174 if (add_netbios_addr) {
175 if ((code = smb_krb5_gen_netbios_krb5_address(&addr,
176 lp_netbios_name()))) {
179 krb5_get_init_creds_opt_set_address_list(opt, addr->addrs);
182 if ((code = krb5_get_init_creds_password(ctx, &my_creds, me, discard_const_p(char,password),
183 kerb_prompter, discard_const_p(char, password),
189 #ifndef SAMBA4_USES_HEIMDAL /* MIT */
190 canon_princ = my_creds.client;
193 if ((code = krb5_cc_initialize(ctx, cc, canon_princ))) {
197 if ((code = krb5_cc_store_cred(ctx, cc, &my_creds))) {
202 *expire_time = (time_t) my_creds.times.endtime;
205 if (renew_till_time) {
206 *renew_till_time = (time_t) my_creds.times.renew_till;
212 *ntstatus = NT_STATUS_OK;
216 /* fall back to self-made-mapping */
217 *ntstatus = krb5_to_nt_status(code);
221 krb5_free_cred_contents(ctx, &my_creds);
223 krb5_free_principal(ctx, me);
226 smb_krb5_free_addresses(ctx, addr);
229 krb5_get_init_creds_opt_free(ctx, opt);
232 krb5_cc_close(ctx, cc);
235 krb5_free_context(ctx);
240 int ads_kdestroy(const char *cc_name)
242 krb5_error_code code;
243 krb5_context ctx = NULL;
244 krb5_ccache cc = NULL;
246 initialize_krb5_error_table();
247 if ((code = krb5_init_context (&ctx))) {
248 DEBUG(3, ("ads_kdestroy: kdb5_init_context failed: %s\n",
249 error_message(code)));
254 if ((code = krb5_cc_default(ctx, &cc))) {
255 krb5_free_context(ctx);
259 if ((code = krb5_cc_resolve(ctx, cc_name, &cc))) {
260 DEBUG(3, ("ads_kdestroy: krb5_cc_resolve failed: %s\n",
261 error_message(code)));
262 krb5_free_context(ctx);
267 if ((code = krb5_cc_destroy (ctx, cc))) {
268 DEBUG(3, ("ads_kdestroy: krb5_cc_destroy failed: %s\n",
269 error_message(code)));
272 krb5_free_context (ctx);
276 int create_kerberos_key_from_string(krb5_context context,
277 krb5_principal host_princ,
278 krb5_principal salt_princ,
281 krb5_enctype enctype,
286 * Check if we've determined that the KDC is salting keys for this
287 * principal/enctype in a non-obvious way. If it is, try to match
291 KRB5_KEY_DATA(key) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
292 if (!KRB5_KEY_DATA(key)) {
295 memcpy(KRB5_KEY_DATA(key), password->data, password->length);
296 KRB5_KEY_LENGTH(key) = password->length;
297 KRB5_KEY_TYPE(key) = enctype;
300 ret = smb_krb5_create_key_from_string(context,
301 salt_princ ? salt_princ : host_princ,
309 /************************************************************************
310 ************************************************************************/
312 int kerberos_kinit_password(const char *principal,
313 const char *password,
315 const char *cache_name)
317 return kerberos_kinit_password_ext(principal,
329 /************************************************************************
330 ************************************************************************/
332 /************************************************************************
333 Create a string list of available kdc's, possibly searching by sitename.
336 If "sitename" is given, the DC's in that site are listed first.
338 ************************************************************************/
340 static void add_sockaddr_unique(struct sockaddr_storage *addrs, size_t *num_addrs,
341 const struct sockaddr_storage *addr)
345 for (i=0; i<*num_addrs; i++) {
346 if (sockaddr_equal((const struct sockaddr *)&addrs[i],
347 (const struct sockaddr *)addr)) {
355 /* print_canonical_sockaddr prints an ipv6 addr in the form of
356 * [ipv6.addr]. This string, when put in a generated krb5.conf file is not
357 * always properly dealt with by some older krb5 libraries. Adding the hard-coded
358 * portnumber workarounds the issue. - gd */
360 static char *print_canonical_sockaddr_with_port(TALLOC_CTX *mem_ctx,
361 const struct sockaddr_storage *pss)
365 str = print_canonical_sockaddr(mem_ctx, pss);
370 if (pss->ss_family != AF_INET6) {
374 #if defined(HAVE_IPV6)
375 str = talloc_asprintf_append(str, ":88");
380 static char *get_kdc_ip_string(char *mem_ctx,
382 const char *sitename,
383 const struct sockaddr_storage *pss)
385 TALLOC_CTX *frame = talloc_stackframe();
387 struct ip_service *ip_srv_site = NULL;
388 struct ip_service *ip_srv_nonsite = NULL;
392 struct sockaddr_storage *dc_addrs;
393 struct tsocket_address **dc_addrs2 = NULL;
394 const struct tsocket_address * const *dc_addrs3 = NULL;
396 struct netlogon_samlogon_response **responses = NULL;
398 char *kdc_str = talloc_asprintf(mem_ctx, "%s\t\tkdc = %s\n", "",
399 print_canonical_sockaddr_with_port(mem_ctx, pss));
401 if (kdc_str == NULL) {
407 * First get the KDC's only in this site, the rest will be
412 get_kdc_list(realm, sitename, &ip_srv_site, &count_site);
413 DEBUG(10, ("got %d addresses from site %s search\n", count_site,
419 get_kdc_list(realm, NULL, &ip_srv_nonsite, &count_nonsite);
420 DEBUG(10, ("got %d addresses from site-less search\n", count_nonsite));
422 dc_addrs = talloc_array(talloc_tos(), struct sockaddr_storage,
423 count_site + count_nonsite);
424 if (dc_addrs == NULL) {
430 for (i = 0; i < count_site; i++) {
432 (const struct sockaddr *)pss,
433 (const struct sockaddr *)&ip_srv_site[i].ss)) {
434 add_sockaddr_unique(dc_addrs, &num_dcs,
439 for (i = 0; i < count_nonsite; i++) {
441 (const struct sockaddr *)pss,
442 (const struct sockaddr *)&ip_srv_nonsite[i].ss)) {
443 add_sockaddr_unique(dc_addrs, &num_dcs,
444 &ip_srv_nonsite[i].ss);
448 dc_addrs2 = talloc_zero_array(talloc_tos(),
449 struct tsocket_address *,
452 DBG_DEBUG("%zu additional KDCs to test\n", num_dcs);
456 if (dc_addrs2 == NULL) {
460 for (i=0; i<num_dcs; i++) {
461 char addr[INET6_ADDRSTRLEN];
464 print_sockaddr(addr, sizeof(addr), &dc_addrs[i]);
466 ret = tsocket_address_inet_from_strings(dc_addrs2, "ip",
470 status = map_nt_error_from_unix(errno);
471 DEBUG(2,("Failed to create tsocket_address for %s - %s\n",
472 addr, nt_errstr(status)));
477 dc_addrs3 = (const struct tsocket_address * const *)dc_addrs2;
479 status = cldap_multi_netlogon(talloc_tos(),
481 realm, lp_netbios_name(),
482 NETLOGON_NT_VERSION_5 | NETLOGON_NT_VERSION_5EX,
483 MIN(num_dcs, 3), timeval_current_ofs(3, 0), &responses);
484 TALLOC_FREE(dc_addrs2);
487 if (!NT_STATUS_IS_OK(status)) {
488 DEBUG(10,("get_kdc_ip_string: cldap_multi_netlogon failed: "
489 "%s\n", nt_errstr(status)));
493 for (i=0; i<num_dcs; i++) {
496 if (responses[i] == NULL) {
500 /* Append to the string - inefficient but not done often. */
501 new_kdc_str = talloc_asprintf(mem_ctx, "%s\t\tkdc = %s\n",
503 print_canonical_sockaddr_with_port(mem_ctx, &dc_addrs[i]));
504 if (new_kdc_str == NULL) {
507 TALLOC_FREE(kdc_str);
508 kdc_str = new_kdc_str;
512 DEBUG(10, ("get_kdc_ip_string: Returning %s\n", kdc_str));
515 SAFE_FREE(ip_srv_site);
516 SAFE_FREE(ip_srv_nonsite);
521 /************************************************************************
522 Create a specific krb5.conf file in the private directory pointing
523 at a specific kdc for a realm. Keyed off domain name. Sets
524 KRB5_CONFIG environment variable to point to this file. Must be
525 run as root or will fail (which is a good thing :-).
526 ************************************************************************/
528 #if !defined(SAMBA4_USES_HEIMDAL) /* MIT version */
529 static char *get_enctypes(TALLOC_CTX *mem_ctx)
531 char *aes_enctypes = NULL;
532 const char *legacy_enctypes = "";
533 char *enctypes = NULL;
535 aes_enctypes = talloc_strdup(mem_ctx, "");
536 if (aes_enctypes == NULL) {
540 if (lp_kerberos_encryption_types() == KERBEROS_ETYPES_ALL ||
541 lp_kerberos_encryption_types() == KERBEROS_ETYPES_STRONG) {
542 #ifdef HAVE_ENCTYPE_AES256_CTS_HMAC_SHA1_96
543 aes_enctypes = talloc_asprintf_append(
544 aes_enctypes, "%s", "aes256-cts-hmac-sha1-96 ");
545 if (aes_enctypes == NULL) {
549 #ifdef HAVE_ENCTYPE_AES128_CTS_HMAC_SHA1_96
550 aes_enctypes = talloc_asprintf_append(
551 aes_enctypes, "%s", "aes128-cts-hmac-sha1-96");
552 if (aes_enctypes == NULL) {
558 if (lp_kerberos_encryption_types() == KERBEROS_ETYPES_ALL ||
559 lp_kerberos_encryption_types() == KERBEROS_ETYPES_LEGACY) {
560 legacy_enctypes = "RC4-HMAC DES-CBC-CRC DES-CBC-MD5";
564 talloc_asprintf(mem_ctx, "\tdefault_tgs_enctypes = %s %s\n"
565 "\tdefault_tkt_enctypes = %s %s\n"
566 "\tpreferred_enctypes = %s %s\n",
567 aes_enctypes, legacy_enctypes, aes_enctypes,
568 legacy_enctypes, aes_enctypes, legacy_enctypes);
570 TALLOC_FREE(aes_enctypes);
573 #else /* Heimdal version */
574 static char *get_enctypes(TALLOC_CTX *mem_ctx)
576 const char *aes_enctypes = "";
577 const char *legacy_enctypes = "";
578 char *enctypes = NULL;
580 if (lp_kerberos_encryption_types() == KERBEROS_ETYPES_ALL ||
581 lp_kerberos_encryption_types() == KERBEROS_ETYPES_STRONG) {
583 "aes256-cts-hmac-sha1-96 aes128-cts-hmac-sha1-96";
586 if (lp_kerberos_encryption_types() == KERBEROS_ETYPES_ALL ||
587 lp_kerberos_encryption_types() == KERBEROS_ETYPES_LEGACY) {
588 legacy_enctypes = "arcfour-hmac-md5 des-cbc-crc des-cbc-md5";
591 enctypes = talloc_asprintf(mem_ctx, "\tdefault_etypes = %s %s\n",
592 aes_enctypes, legacy_enctypes);
598 bool create_local_private_krb5_conf_for_domain(const char *realm,
600 const char *sitename,
601 const struct sockaddr_storage *pss)
604 char *tmpname = NULL;
606 char *file_contents = NULL;
607 char *kdc_ip_string = NULL;
611 char *realm_upper = NULL;
613 char *enctypes = NULL;
614 const char *include_system_krb5 = "";
617 if (!lp_create_krb5_conf()) {
622 DEBUG(0, ("No realm has been specified! Do you really want to "
623 "join an Active Directory server?\n"));
627 if (domain == NULL || pss == NULL) {
631 dname = lock_path("smb_krb5");
635 if ((mkdir(dname, 0755)==-1) && (errno != EEXIST)) {
636 DEBUG(0,("create_local_private_krb5_conf_for_domain: "
637 "failed to create directory %s. Error was %s\n",
638 dname, strerror(errno) ));
642 tmpname = lock_path("smb_tmp_krb5.XXXXXX");
647 fname = talloc_asprintf(dname, "%s/krb5.conf.%s", dname, domain);
652 DEBUG(10,("create_local_private_krb5_conf_for_domain: fname = %s, realm = %s, domain = %s\n",
653 fname, realm, domain ));
655 realm_upper = talloc_strdup(fname, realm);
656 if (!strupper_m(realm_upper)) {
660 kdc_ip_string = get_kdc_ip_string(dname, realm, sitename, pss);
661 if (!kdc_ip_string) {
665 enctypes = get_enctypes(fname);
666 if (enctypes == NULL) {
670 #if !defined(SAMBA4_USES_HEIMDAL)
671 if (lp_include_system_krb5_conf()) {
672 include_system_krb5 = "include /etc/krb5.conf";
677 talloc_asprintf(fname,
678 "[libdefaults]\n\tdefault_realm = %s\n"
680 "\tdns_lookup_realm = false\n\n"
681 "[realms]\n\t%s = {\n"
688 include_system_krb5);
690 if (!file_contents) {
694 flen = strlen(file_contents);
696 mask = umask(S_IRWXO | S_IRWXG);
697 fd = mkstemp(tmpname);
700 DEBUG(0,("create_local_private_krb5_conf_for_domain: smb_mkstemp failed,"
701 " for file %s. Errno %s\n",
702 tmpname, strerror(errno) ));
706 if (fchmod(fd, 0644)==-1) {
707 DEBUG(0,("create_local_private_krb5_conf_for_domain: fchmod failed for %s."
709 tmpname, strerror(errno) ));
715 ret = write(fd, file_contents, flen);
717 DEBUG(0,("create_local_private_krb5_conf_for_domain: write failed,"
718 " returned %d (should be %u). Errno %s\n",
719 (int)ret, (unsigned int)flen, strerror(errno) ));
725 DEBUG(0,("create_local_private_krb5_conf_for_domain: close failed."
726 " Errno %s\n", strerror(errno) ));
731 if (rename(tmpname, fname) == -1) {
732 DEBUG(0,("create_local_private_krb5_conf_for_domain: rename "
733 "of %s to %s failed. Errno %s\n",
734 tmpname, fname, strerror(errno) ));
739 DEBUG(5,("create_local_private_krb5_conf_for_domain: wrote "
740 "file %s with realm %s KDC list = %s\n",
741 fname, realm_upper, kdc_ip_string));
743 /* Set the environment variable to this file. */
744 setenv("KRB5_CONFIG", fname, 1);
748 #if defined(OVERWRITE_SYSTEM_KRB5_CONF)
750 #define SYSTEM_KRB5_CONF_PATH "/etc/krb5.conf"
751 /* Insanity, sheer insanity..... */
753 if (strequal(realm, lp_realm())) {
754 SMB_STRUCT_STAT sbuf;
756 if (sys_lstat(SYSTEM_KRB5_CONF_PATH, &sbuf, false) == 0) {
757 if (S_ISLNK(sbuf.st_ex_mode) && sbuf.st_ex_size) {
759 size_t alloc_size = sbuf.st_ex_size + 1;
760 char *linkpath = talloc_array(talloc_tos(), char,
765 lret = readlink(SYSTEM_KRB5_CONF_PATH, linkpath,
768 TALLOC_FREE(linkpath);
771 linkpath[lret] = '\0';
773 if (strcmp(linkpath, fname) == 0) {
774 /* Symlink already exists. */
775 TALLOC_FREE(linkpath);
778 TALLOC_FREE(linkpath);
782 /* Try and replace with a symlink. */
783 if (symlink(fname, SYSTEM_KRB5_CONF_PATH) == -1) {
784 const char *newpath = SYSTEM_KRB5_CONF_PATH ".saved";
785 if (errno != EEXIST) {
786 DEBUG(0,("create_local_private_krb5_conf_for_domain: symlink "
787 "of %s to %s failed. Errno %s\n",
788 fname, SYSTEM_KRB5_CONF_PATH, strerror(errno) ));
789 goto done; /* Not a fatal error. */
792 /* Yes, this is a race conditon... too bad. */
793 if (rename(SYSTEM_KRB5_CONF_PATH, newpath) == -1) {
794 DEBUG(0,("create_local_private_krb5_conf_for_domain: rename "
795 "of %s to %s failed. Errno %s\n",
796 SYSTEM_KRB5_CONF_PATH, newpath,
798 goto done; /* Not a fatal error. */
801 if (symlink(fname, SYSTEM_KRB5_CONF_PATH) == -1) {
802 DEBUG(0,("create_local_private_krb5_conf_for_domain: "
803 "forced symlink of %s to /etc/krb5.conf failed. Errno %s\n",
804 fname, strerror(errno) ));
805 goto done; /* Not a fatal error. */
812 TALLOC_FREE(tmpname);