2 Unix SMB/CIFS implementation.
3 simple kerberos5 routines for active directory
4 Copyright (C) Andrew Tridgell 2001
5 Copyright (C) Luke Howard 2002-2003
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
7 Copyright (C) Guenther Deschner 2005-2009
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 #include "krb5_samba.h"
25 #include "librpc/gen_ndr/krb5pac.h"
26 #include "lib/util/asn1.h"
28 #ifndef KRB5_AUTHDATA_WIN2K_PAC
29 #define KRB5_AUTHDATA_WIN2K_PAC 128
32 #ifndef KRB5_AUTHDATA_IF_RELEVANT
33 #define KRB5_AUTHDATA_IF_RELEVANT 1
38 #define GSSAPI_CHECKSUM 0x8003 /* Checksum type value for Kerberos */
39 #define GSSAPI_BNDLENGTH 16 /* Bind Length (rfc-1964 pg.3) */
40 #define GSSAPI_CHECKSUM_SIZE (4+GSSAPI_BNDLENGTH+4) /* Length of bind length,
41 bind field, flags field. */
42 #define GSS_C_DELEG_FLAG 1
44 /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
45 but still has the symbol */
46 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
47 krb5_error_code krb5_auth_con_set_req_cksumtype(
49 krb5_auth_context auth_context,
50 krb5_cksumtype cksumtype);
53 #if !defined(SMB_MALLOC)
55 #define SMB_MALLOC(s) malloc((s))
58 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
60 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
62 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
63 * to krb5_set_default_tgs_ktypes. See
64 * http://lists.samba.org/archive/samba-technical/2006-July/048271.html
66 * If the MIT libraries are not exporting internal symbols, we will end up in
67 * this branch, which is correct. Otherwise we will continue to use the
70 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
72 return krb5_set_default_tgs_enctypes(ctx, enc);
75 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
78 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
80 return krb5_set_default_in_tkt_etypes(ctx, enc);
83 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
85 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
87 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
89 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
91 memset(pkaddr, '\0', sizeof(krb5_address));
92 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
93 if (paddr->ss_family == AF_INET6) {
94 pkaddr->addr_type = KRB5_ADDRESS_INET6;
95 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
96 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
100 if (paddr->ss_family == AF_INET) {
101 pkaddr->addr_type = KRB5_ADDRESS_INET;
102 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
103 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
108 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
110 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
112 memset(pkaddr, '\0', sizeof(krb5_address));
113 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
114 if (paddr->ss_family == AF_INET6) {
115 pkaddr->addrtype = ADDRTYPE_INET6;
116 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
117 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
121 if (paddr->ss_family == AF_INET) {
122 pkaddr->addrtype = ADDRTYPE_INET;
123 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
124 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
130 #error UNKNOWN_ADDRTYPE
133 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_C_STRING_TO_KEY)
135 int create_kerberos_key_from_string_direct(krb5_context context,
136 krb5_principal host_princ,
139 krb5_enctype enctype)
144 ret = krb5_principal2salt(context, host_princ, &salt);
146 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
149 ret = krb5_c_string_to_key(context, enctype, password, &salt, key);
150 SAFE_FREE(salt.data);
154 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
156 int create_kerberos_key_from_string_direct(krb5_context context,
157 krb5_principal host_princ,
160 krb5_enctype enctype)
165 ret = krb5_get_pw_salt(context, host_princ, &salt);
167 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
171 ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
172 krb5_free_salt(context, salt);
177 #error UNKNOWN_CREATE_KEY_FUNCTIONS
180 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
181 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
182 krb5_enctype **enctypes)
184 return krb5_get_permitted_enctypes(context, enctypes);
186 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
187 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
188 krb5_enctype **enctypes)
190 #ifdef HAVE_KRB5_PDU_NONE_DECL
191 return krb5_get_default_in_tkt_etypes(context, KRB5_PDU_NONE, enctypes);
193 return krb5_get_default_in_tkt_etypes(context, enctypes);
197 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
200 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
201 krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
202 krb5_auth_context auth_context,
203 krb5_keyblock *keyblock)
205 return krb5_auth_con_setkey(context, auth_context, keyblock);
209 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
211 DATA_BLOB *edata_out)
213 DATA_BLOB edata_contents;
217 if (!edata->length) {
221 data = asn1_init(mem_ctx);
226 asn1_load(data, *edata);
227 asn1_start_tag(data, ASN1_SEQUENCE(0));
228 asn1_start_tag(data, ASN1_CONTEXT(1));
229 asn1_read_Integer(data, &edata_type);
231 if (edata_type != KRB5_PADATA_PW_SALT) {
232 DEBUG(0,("edata is not of required type %d but of type %d\n",
233 KRB5_PADATA_PW_SALT, edata_type));
238 asn1_start_tag(data, ASN1_CONTEXT(2));
239 asn1_read_OctetString(data, talloc_tos(), &edata_contents);
245 *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
247 data_blob_free(&edata_contents);
253 static bool ads_cleanup_expired_creds(krb5_context context,
257 krb5_error_code retval;
258 const char *cc_type = krb5_cc_get_type(context, ccache);
260 DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
261 cc_type, krb5_cc_get_name(context, ccache),
262 http_timestring(talloc_tos(), credsp->times.endtime)));
264 /* we will probably need new tickets if the current ones
265 will expire within 10 seconds.
267 if (credsp->times.endtime >= (time(NULL) + 10))
270 /* heimdal won't remove creds from a file ccache, and
271 perhaps we shouldn't anyway, since internally we
272 use memory ccaches, and a FILE one probably means that
273 we're using creds obtained outside of our exectuable
275 if (strequal(cc_type, "FILE")) {
276 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
280 retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
282 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
283 error_message(retval)));
284 /* If we have an error in this, we want to display it,
285 but continue as though we deleted it */
290 /* Allocate and setup the auth context into the state we need. */
292 static krb5_error_code setup_auth_context(krb5_context context,
293 krb5_auth_context *auth_context)
295 krb5_error_code retval;
297 retval = krb5_auth_con_init(context, auth_context );
299 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
300 error_message(retval)));
304 /* Ensure this is an addressless ticket. */
305 retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
307 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
308 error_message(retval)));
314 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
315 static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
318 unsigned int orig_length = in_data->length;
319 unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
320 char *gss_cksum = NULL;
323 /* Extra length field for delgated ticket. */
324 base_cksum_size += 4;
327 if ((unsigned int)base_cksum_size + orig_length <
328 (unsigned int)base_cksum_size) {
332 gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
333 if (gss_cksum == NULL) {
337 memset(gss_cksum, '\0', base_cksum_size + orig_length);
338 SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
341 * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
342 * This matches the behavior of heimdal and mit.
344 * And it is needed to work against some closed source
349 memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
351 SIVAL(gss_cksum, 20, gss_flags);
354 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
355 SSVAL(gss_cksum, 26, orig_length);
356 /* Copy the kerberos KRB_CRED data */
357 memcpy(gss_cksum + 28, in_data->data, orig_length);
359 in_data->data = NULL;
362 in_data->data = gss_cksum;
363 in_data->length = base_cksum_size + orig_length;
368 /**************************************************************
369 krb5_parse_name that takes a UNIX charset.
370 **************************************************************/
372 krb5_error_code smb_krb5_parse_name(krb5_context context,
373 const char *name, /* in unix charset */
374 krb5_principal *principal)
378 size_t converted_size;
379 TALLOC_CTX *frame = talloc_stackframe();
381 if (!push_utf8_talloc(frame, &utf8_name, name, &converted_size)) {
386 ret = krb5_parse_name(context, utf8_name, principal);
391 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
392 void krb5_free_unparsed_name(krb5_context context, char *val)
398 /**************************************************************
399 krb5_parse_name that returns a UNIX charset name. Must
400 be freed with talloc_free() call.
401 **************************************************************/
403 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
404 krb5_context context,
405 krb5_const_principal principal,
410 size_t converted_size;
413 ret = krb5_unparse_name(context, principal, &utf8_name);
418 if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
419 krb5_free_unparsed_name(context, utf8_name);
422 krb5_free_unparsed_name(context, utf8_name);
426 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
428 krb5_principal *principal)
430 /* we are cheating here because parse_name will in fact set the realm.
431 * We don't care as the only caller of smb_krb5_parse_name_norealm
432 * ignores the realm anyway when calling
433 * smb_krb5_principal_compare_any_realm later - Guenther */
435 return smb_krb5_parse_name(context, name, principal);
438 bool smb_krb5_principal_compare_any_realm(krb5_context context,
439 krb5_const_principal princ1,
440 krb5_const_principal princ2)
442 return krb5_principal_compare_any_realm(context, princ1, princ2);
446 we can't use krb5_mk_req because w2k wants the service to be in a particular format
448 static krb5_error_code ads_krb5_mk_req(krb5_context context,
449 krb5_auth_context *auth_context,
450 const krb5_flags ap_req_options,
451 const char *principal,
455 const char *impersonate_princ_s)
457 krb5_error_code retval;
458 krb5_principal server;
459 krb5_principal impersonate_princ = NULL;
463 bool creds_ready = false;
464 int i = 0, maxtries = 3;
466 ZERO_STRUCT(in_data);
468 retval = smb_krb5_parse_name(context, principal, &server);
470 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
474 if (impersonate_princ_s) {
475 retval = smb_krb5_parse_name(context, impersonate_princ_s,
478 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
483 /* obtain ticket & session key */
485 if ((retval = krb5_copy_principal(context, server, &creds.server))) {
486 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
487 error_message(retval)));
491 if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
492 /* This can commonly fail on smbd startup with no ticket in the cache.
493 * Report at higher level than 1. */
494 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
495 error_message(retval)));
499 while (!creds_ready && (i < maxtries)) {
501 if ((retval = smb_krb5_get_credentials(context, ccache,
506 DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
507 principal, error_message(retval)));
511 /* cope with ticket being in the future due to clock skew */
512 if ((unsigned)credsp->times.starttime > time(NULL)) {
513 time_t t = time(NULL);
514 int time_offset =(int)((unsigned)credsp->times.starttime-t);
515 DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
516 krb5_set_real_time(context, t + time_offset + 1, 0);
519 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
526 DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
527 principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
528 http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
529 (unsigned)credsp->times.endtime));
532 *expire_time = (time_t)credsp->times.endtime;
535 /* Allocate the auth_context. */
536 retval = setup_auth_context(context, auth_context);
538 DEBUG(1,("setup_auth_context failed (%s)\n",
539 error_message(retval)));
543 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
545 uint32_t gss_flags = 0;
547 if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
548 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
549 as part of the kerberos exchange. */
551 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n") );
553 retval = krb5_auth_con_setuseruserkey(context,
557 DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
558 error_message(retval)));
562 /* Must use a subkey for forwarded tickets. */
563 retval = krb5_auth_con_setflags(context,
565 KRB5_AUTH_CONTEXT_USE_SUBKEY);
567 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
568 error_message(retval)));
572 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
573 *auth_context, /* Authentication context [in] */
574 discard_const_p(char, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
575 credsp->client, /* Client principal for the tgt [in] */
576 credsp->server, /* Server principal for the tgt [in] */
577 ccache, /* Credential cache to use for storage [in] */
578 1, /* Turn on for "Forwardable ticket" [in] */
579 &in_data ); /* Resulting response [out] */
582 DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
583 error_message( retval ) ) );
586 * This is not fatal. Delete the *auth_context and continue
587 * with krb5_mk_req_extended to get a non-forwardable ticket.
591 free( in_data.data );
595 krb5_auth_con_free(context, *auth_context);
596 *auth_context = NULL;
597 retval = setup_auth_context(context, auth_context);
599 DEBUG(1,("setup_auth_context failed (%s)\n",
600 error_message(retval)));
604 /* We got a delegated ticket. */
605 gss_flags |= GSS_C_DELEG_FLAG;
609 /* Frees and reallocates in_data into a GSS checksum blob. */
610 retval = create_gss_checksum(&in_data, gss_flags);
615 /* We always want GSS-checksum types. */
616 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
618 DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
619 error_message(retval)));
625 retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
626 &in_data, credsp, outbuf);
628 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
629 error_message(retval)));
632 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
637 free( in_data.data );
641 krb5_free_creds(context, credsp);
644 krb5_free_cred_contents(context, &creds);
647 krb5_free_principal(context, server);
648 if (impersonate_princ) {
649 krb5_free_principal(context, impersonate_princ);
655 void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
657 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
659 krb5_free_data_contents(context, pdata);
661 #elif defined(HAVE_KRB5_DATA_FREE)
662 krb5_data_free(context, pdata);
664 SAFE_FREE(pdata->data);
669 get a kerberos5 ticket for the given service
671 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
672 const char *principal, time_t time_offset,
673 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
674 uint32_t extra_ap_opts, const char *ccname,
676 const char *impersonate_princ_s)
679 krb5_error_code retval;
681 krb5_context context = NULL;
682 krb5_ccache ccdef = NULL;
683 krb5_auth_context auth_context = NULL;
684 krb5_enctype enc_types[] = {
685 ENCTYPE_ARCFOUR_HMAC,
690 initialize_krb5_error_table();
691 retval = krb5_init_context(&context);
693 DEBUG(1, ("krb5_init_context failed (%s)\n",
694 error_message(retval)));
698 if (time_offset != 0) {
699 krb5_set_real_time(context, time(NULL) + time_offset, 0);
702 if ((retval = krb5_cc_resolve(context, ccname ?
703 ccname : krb5_cc_default_name(context), &ccdef))) {
704 DEBUG(1, ("krb5_cc_default failed (%s)\n",
705 error_message(retval)));
709 if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
710 DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
711 error_message(retval)));
715 retval = ads_krb5_mk_req(context, &auth_context,
716 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
717 principal, ccdef, &packet,
718 tgs_expire, impersonate_princ_s);
723 get_krb5_smb_session_key(mem_ctx, context, auth_context,
724 session_key_krb5, false);
726 *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
728 kerberos_free_data_contents(context, &packet);
734 krb5_cc_close(context, ccdef);
736 krb5_auth_con_free(context, auth_context);
737 krb5_free_context(context);
743 bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
744 krb5_context context,
745 krb5_auth_context auth_context,
746 DATA_BLOB *session_key, bool remote)
748 krb5_keyblock *skey = NULL;
749 krb5_error_code err = 0;
753 err = krb5_auth_con_getremotesubkey(context,
754 auth_context, &skey);
756 err = krb5_auth_con_getlocalsubkey(context,
757 auth_context, &skey);
760 if (err || skey == NULL) {
761 DEBUG(10, ("KRB5 error getting session key %d\n", err));
765 DEBUG(10, ("Got KRB5 session key of length %d\n",
766 (int)KRB5_KEY_LENGTH(skey)));
768 *session_key = data_blob_talloc(mem_ctx,
770 KRB5_KEY_LENGTH(skey));
771 dump_data_pw("KRB5 Session Key:\n",
773 session_key->length);
779 krb5_free_keyblock(context, skey);
786 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
787 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
789 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
791 static krb5_data kdata;
793 kdata.data = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i));
794 kdata.length = strlen((const char *)kdata.data);
801 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, /* FILE:/tmp/krb5cc_0 */
802 const char *client_string, /* gd@BER.SUSE.DE */
803 const char *service_string, /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
807 krb5_context context = NULL;
808 krb5_ccache ccache = NULL;
809 krb5_principal client = NULL;
810 krb5_creds creds, creds_in, *creds_out = NULL;
813 ZERO_STRUCT(creds_in);
815 initialize_krb5_error_table();
816 ret = krb5_init_context(&context);
821 if (!ccache_string) {
822 ccache_string = krb5_cc_default_name(context);
825 if (!ccache_string) {
830 DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
832 /* FIXME: we should not fall back to defaults */
833 ret = krb5_cc_resolve(context, discard_const_p(char, ccache_string), &ccache);
839 ret = smb_krb5_parse_name(context, client_string, &client);
844 ret = krb5_cc_get_principal(context, ccache, &client);
850 ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string));
852 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
856 /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
857 ret = krb5_cc_initialize(context, ccache, client);
862 ret = krb5_cc_store_cred(context, ccache, &creds);
865 *expire_time = (time_t) creds.times.endtime;
869 krb5_free_cred_contents(context, &creds_in);
872 krb5_free_creds(context, creds_out);
874 krb5_free_cred_contents(context, &creds);
878 krb5_free_principal(context, client);
881 krb5_cc_close(context, ccache);
884 krb5_free_context(context);
890 krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
892 krb5_error_code ret = 0;
896 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
897 krb5_free_addresses(context, addr->addrs);
898 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
899 ret = krb5_free_addresses(context, addr->addrs);
900 SAFE_FREE(addr->addrs);
907 #define MAX_NETBIOSNAME_LEN 16
908 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr,
909 const char *netbios_name)
911 krb5_error_code ret = 0;
912 char buf[MAX_NETBIOSNAME_LEN];
914 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
915 krb5_address **addrs = NULL;
916 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
917 krb5_addresses *addrs = NULL;
920 *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
921 if (*kerb_addr == NULL) {
925 /* temporarily duplicate put_name() code here to avoid dependency
926 * issues for a 5 lines function */
927 len = strlen(netbios_name);
928 memcpy(buf, netbios_name,
929 (len < MAX_NETBIOSNAME_LEN) ? len : MAX_NETBIOSNAME_LEN - 1);
930 if (len < MAX_NETBIOSNAME_LEN - 1) {
931 memset(buf + len, ' ', MAX_NETBIOSNAME_LEN - 1 - len);
933 buf[MAX_NETBIOSNAME_LEN - 1] = 0x20;
935 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
939 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
941 SAFE_FREE(*kerb_addr);
945 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
947 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
948 if (addrs[0] == NULL) {
950 SAFE_FREE(*kerb_addr);
954 addrs[0]->magic = KV5M_ADDRESS;
955 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
956 addrs[0]->length = MAX_NETBIOSNAME_LEN;
957 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
958 if (addrs[0]->contents == NULL) {
961 SAFE_FREE(*kerb_addr);
965 memcpy(addrs[0]->contents, buf, addrs[0]->length);
969 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
971 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
973 SAFE_FREE(*kerb_addr);
977 memset(addrs, 0, sizeof(krb5_addresses));
980 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
981 if (addrs->val == NULL) {
983 SAFE_FREE(kerb_addr);
987 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
988 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
989 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
990 if (addrs->val[0].address.data == NULL) {
991 SAFE_FREE(addrs->val);
993 SAFE_FREE(*kerb_addr);
997 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1000 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1002 (*kerb_addr)->addrs = addrs;
1007 void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1009 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1010 krb5_free_error_contents(context, krberror);
1012 krb5_free_error(context, krberror);
1016 krb5_error_code handle_krberror_packet(krb5_context context,
1019 krb5_error_code ret;
1020 bool got_error_code = false;
1022 DEBUG(10,("handle_krberror_packet: got error packet\n"));
1024 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1026 krb5_error krberror;
1028 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1029 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1030 error_message(ret)));
1034 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1035 ret = (krb5_error_code) krberror.error_code;
1036 got_error_code = true;
1039 smb_krb5_free_error(context, &krberror);
1043 krb5_error *krberror;
1045 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1046 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1047 error_message(ret)));
1051 if (krberror->e_data.data == NULL) {
1052 #if defined(ERROR_TABLE_BASE_krb5)
1053 ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1055 ret = (krb5_error_code)krberror->error;
1057 got_error_code = true;
1059 smb_krb5_free_error(context, krberror);
1062 if (got_error_code) {
1063 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1064 error_message(ret), ret));
1069 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1070 krb5_get_init_creds_opt **opt)
1072 /* Heimdal or modern MIT version */
1073 return krb5_get_init_creds_opt_alloc(context, opt);
1076 void smb_krb5_get_init_creds_opt_free(krb5_context context,
1077 krb5_get_init_creds_opt *opt)
1079 /* Modern MIT or Heimdal version */
1080 krb5_get_init_creds_opt_free(context, opt);
1083 krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1085 return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1088 krb5_error_code smb_krb5_kt_free_entry(krb5_context context,
1089 krb5_keytab_entry *kt_entry)
1091 /* Try krb5_free_keytab_entry_contents first, since
1092 * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
1093 * krb5_kt_free_entry but only has a prototype for the first, while the
1094 * second is considered private.
1096 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
1097 return krb5_free_keytab_entry_contents(context, kt_entry);
1098 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
1099 return krb5_kt_free_entry(context, kt_entry);
1101 #error UNKNOWN_KT_FREE_FUNCTION
1106 /* caller needs to free etype_s */
1107 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1108 krb5_enctype enctype,
1111 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1112 return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1113 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1115 krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1119 *etype_s = SMB_STRDUP(buf);
1125 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1129 /**********************************************************************
1130 * Open a krb5 keytab with flags, handles readonly or readwrite access and
1131 * allows to process non-default keytab names.
1132 * @param context krb5_context
1133 * @param keytab_name_req string
1134 * @param write_access bool if writable keytab is required
1135 * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1136 * @return krb5_error_code
1137 **********************************************************************/
1139 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1140 #ifndef MAX_KEYTAB_NAME_LEN
1141 #define MAX_KEYTAB_NAME_LEN 1100
1144 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1145 const char *keytab_name_req,
1147 krb5_keytab *keytab)
1149 krb5_error_code ret = 0;
1150 TALLOC_CTX *mem_ctx;
1151 char keytab_string[MAX_KEYTAB_NAME_LEN];
1152 char *kt_str = NULL;
1153 bool found_valid_name = false;
1154 const char *pragma = "FILE";
1155 const char *tmp = NULL;
1157 if (!write_access && !keytab_name_req) {
1158 /* caller just wants to read the default keytab readonly, so be it */
1159 return krb5_kt_default(context, keytab);
1162 mem_ctx = talloc_init("smb_krb5_open_keytab");
1167 #ifdef HAVE_WRFILE_KEYTAB
1173 if (keytab_name_req) {
1175 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1176 ret = KRB5_CONFIG_NOTENUFSPACE;
1180 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1181 (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1182 tmp = keytab_name_req;
1186 if (keytab_name_req[0] != '/') {
1187 ret = KRB5_KT_BADNAME;
1191 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1200 /* we need to handle more complex keytab_strings, like:
1201 * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1203 ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1208 DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1210 tmp = talloc_strdup(mem_ctx, keytab_string);
1216 if (strncmp(tmp, "ANY:", 4) == 0) {
1220 memset(&keytab_string, '\0', sizeof(keytab_string));
1222 while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1223 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1224 found_valid_name = true;
1229 if (strncmp(kt_str, "FILE:", 5) == 0) {
1230 found_valid_name = true;
1235 if (tmp[0] == '/') {
1236 /* Treat as a FILE: keytab definition. */
1237 found_valid_name = true;
1240 if (found_valid_name) {
1241 if (tmp[0] != '/') {
1242 ret = KRB5_KT_BADNAME;
1246 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1255 if (!found_valid_name) {
1256 ret = KRB5_KT_UNKNOWN_TYPE;
1261 DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1262 ret = krb5_kt_resolve(context, tmp, keytab);
1265 TALLOC_FREE(mem_ctx);
1269 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1270 krb5_context context,
1272 const char **keytab_name)
1274 char keytab_string[MAX_KEYTAB_NAME_LEN];
1275 krb5_error_code ret = 0;
1277 ret = krb5_kt_get_name(context, keytab,
1278 keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1283 *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1284 if (!*keytab_name) {
1291 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1292 defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1293 defined(HAVE_KRB5_GET_CREDS)
1294 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1297 krb5_principal server,
1298 krb5_principal impersonate_princ,
1299 krb5_creds **out_creds)
1301 krb5_error_code ret;
1302 krb5_get_creds_opt opt;
1304 ret = krb5_get_creds_opt_alloc(context, &opt);
1308 krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1310 if (impersonate_princ) {
1311 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1318 ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1325 krb5_get_creds_opt_free(context, opt);
1329 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1331 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1332 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1335 krb5_principal server,
1336 krb5_principal impersonate_princ,
1337 krb5_creds **out_creds)
1339 krb5_error_code ret;
1340 krb5_creds in_creds;
1342 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1343 krb5_error_code KRB5_CALLCONV
1344 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1345 krb5_ccache ccache, krb5_creds *in_creds,
1346 krb5_data *subject_cert,
1347 krb5_creds **out_creds);
1348 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1350 ZERO_STRUCT(in_creds);
1352 if (impersonate_princ) {
1354 in_creds.server = me;
1355 in_creds.client = impersonate_princ;
1357 ret = krb5_get_credentials_for_user(context,
1358 0, /* krb5_flags options */
1361 NULL, /* krb5_data *subject_cert */
1364 in_creds.client = me;
1365 in_creds.server = server;
1367 ret = krb5_get_credentials(context, 0, ccache,
1368 &in_creds, out_creds);
1373 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1376 * smb_krb5_get_credentials
1378 * @brief Get krb5 credentials for a server
1380 * @param[in] context An initialized krb5_context
1381 * @param[in] ccache An initialized krb5_ccache
1382 * @param[in] me The krb5_principal of the caller
1383 * @param[in] server The krb5_principal of the requested service
1384 * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1385 * @param[out] out_creds The returned krb5_creds structure
1386 * @return krb5_error_code
1389 krb5_error_code smb_krb5_get_credentials(krb5_context context,
1392 krb5_principal server,
1393 krb5_principal impersonate_princ,
1394 krb5_creds **out_creds)
1396 krb5_error_code ret;
1397 krb5_creds *creds = NULL;
1401 if (impersonate_princ) {
1402 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
1403 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
1404 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
1405 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
1410 krb5_creds in_creds;
1412 ZERO_STRUCT(in_creds);
1414 in_creds.client = me;
1415 in_creds.server = server;
1417 ret = krb5_get_credentials(context, 0, ccache,
1430 krb5_free_creds(context, creds);
1437 * smb_krb5_get_creds
1439 * @brief Get krb5 credentials for a server
1441 * @param[in] server_s The string name of the service
1442 * @param[in] time_offset The offset to the KDCs time in seconds (optional)
1443 * @param[in] cc The krb5 credential cache string name (optional)
1444 * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
1445 * @param[out] creds_p The returned krb5_creds structure
1446 * @return krb5_error_code
1449 krb5_error_code smb_krb5_get_creds(const char *server_s,
1452 const char *impersonate_princ_s,
1453 krb5_creds **creds_p)
1455 krb5_error_code ret;
1456 krb5_context context = NULL;
1457 krb5_principal me = NULL;
1458 krb5_principal server = NULL;
1459 krb5_principal impersonate_princ = NULL;
1460 krb5_creds *creds = NULL;
1461 krb5_ccache ccache = NULL;
1465 initialize_krb5_error_table();
1466 ret = krb5_init_context(&context);
1471 if (time_offset != 0) {
1472 krb5_set_real_time(context, time(NULL) + time_offset, 0);
1475 ret = krb5_cc_resolve(context, cc ? cc :
1476 krb5_cc_default_name(context), &ccache);
1481 ret = krb5_cc_get_principal(context, ccache, &me);
1486 ret = smb_krb5_parse_name(context, server_s, &server);
1491 if (impersonate_princ_s) {
1492 ret = smb_krb5_parse_name(context, impersonate_princ_s,
1493 &impersonate_princ);
1499 ret = smb_krb5_get_credentials(context, ccache,
1500 me, server, impersonate_princ,
1506 ret = krb5_cc_store_cred(context, ccache, creds);
1515 DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
1518 if (impersonate_princ_s) {
1519 char *client = NULL;
1521 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
1525 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
1527 TALLOC_FREE(client);
1536 krb5_free_creds(context, creds);
1539 krb5_free_principal(context, server);
1542 krb5_free_principal(context, me);
1544 if (impersonate_princ) {
1545 krb5_free_principal(context, impersonate_princ);
1548 krb5_cc_close(context, ccache);
1550 krb5_free_context(context);
1556 simulate a kinit, putting the tgt in the given credentials cache.
1557 Orignally by remus@snapserver.com
1559 This version is built to use a keyblock, rather than needing the
1562 The impersonate_principal is the principal if NULL, or the principal
1565 The target_service defaults to the krbtgt if NULL, but could be
1566 kpasswd/realm or the local service (if we are doing s4u2self)
1568 krb5_error_code kerberos_kinit_keyblock_cc(krb5_context ctx, krb5_ccache cc,
1569 krb5_principal principal,
1570 krb5_keyblock *keyblock,
1571 const char *target_service,
1572 krb5_get_init_creds_opt *krb_options,
1573 time_t *expire_time,
1576 krb5_error_code code = 0;
1577 krb5_creds my_creds;
1579 #if defined(HAVE_KRB5_GET_INIT_CREDS_KEYBLOCK)
1580 code = krb5_get_init_creds_keyblock(ctx, &my_creds, principal,
1581 keyblock, 0, target_service,
1583 #elif defined(HAVE_KRB5_GET_INIT_CREDS_KEYTAB)
1585 #define SMB_CREDS_KEYTAB "MEMORY:tmp_smb_creds_XXXXXX"
1586 char *tmp_name[sizeof(SMB_CREDS_KEYTAB)];
1587 krb5_keytab_entry entry;
1590 memset(entry, 0, sizeof(entry));
1591 entry.principal = principal;
1592 entry.key = keyblock;
1594 memcpy(tmp_name, SMB_CREDS_KEYTAB, sizeof(SMB_CREDS_KEYTAB))
1596 if (tmp_name[0] == 0) {
1597 return KRB5_KT_BADNAME;
1599 code = krb5_kt_resolve(ctx, tmp_name, &keytab);
1604 code = krb5_kt_add_entry(ctx, keytab, &entry);
1606 (void)krb5_kt_close(ctx, keytab);
1610 code = krb5_get_init_creds_keytab(ctx, &my_creds, principal,
1611 keytab, 0, target_service,
1613 (void)krb5_kt_close(ctx, keytab);
1616 #error krb5_get_init_creds_keyblock not available!
1622 code = krb5_cc_initialize(ctx, cc, principal);
1627 code = krb5_cc_store_cred(ctx, cc, &my_creds);
1633 *expire_time = (time_t) my_creds.times.endtime;
1637 *kdc_time = (time_t) my_creds.times.starttime;
1642 krb5_free_cred_contents(ctx, &my_creds);
1647 simulate a kinit, putting the tgt in the given credentials cache.
1648 Orignally by remus@snapserver.com
1650 The impersonate_principal is the principal if NULL, or the principal to
1653 The self_service, should be the local service (for S4U2Self if
1654 impersonate_principal is given).
1656 The target_service defaults to the krbtgt if NULL, but could be
1657 kpasswd/realm or a remote service (for S4U2Proxy)
1660 krb5_error_code kerberos_kinit_password_cc(krb5_context ctx,
1661 krb5_ccache store_cc,
1662 krb5_principal init_principal,
1663 const char *init_password,
1664 krb5_principal impersonate_principal,
1665 const char *self_service,
1666 const char *target_service,
1667 krb5_get_init_creds_opt *krb_options,
1668 time_t *expire_time,
1671 krb5_error_code code = 0;
1672 krb5_get_creds_opt options;
1673 krb5_principal store_principal;
1674 krb5_creds store_creds;
1675 krb5_creds *s4u2self_creds;
1676 Ticket s4u2self_ticket;
1677 size_t s4u2self_ticketlen;
1678 krb5_creds *s4u2proxy_creds;
1679 krb5_principal self_princ;
1681 krb5_principal target_princ;
1683 const char *self_realm;
1684 krb5_principal blacklist_principal = NULL;
1685 krb5_principal whitelist_principal = NULL;
1687 if (impersonate_principal && self_service == NULL) {
1692 * If we are not impersonating, then get this ticket for the
1693 * target service, otherwise a krbtgt, and get the next ticket
1696 code = krb5_get_init_creds_password(ctx, &store_creds,
1701 impersonate_principal ? NULL : target_service,
1707 store_principal = init_principal;
1709 if (impersonate_principal == NULL) {
1714 * We are trying S4U2Self now:
1716 * As we do not want to expose our TGT in the
1717 * krb5_ccache, which is also holds the impersonated creds.
1719 * Some low level krb5/gssapi function might use the TGT
1720 * identity and let the client act as our machine account.
1722 * We need to avoid that and use a temporary krb5_ccache
1723 * in order to pass our TGT to the krb5_get_creds() function.
1725 code = krb5_cc_new_unique(ctx, NULL, NULL, &tmp_cc);
1727 krb5_free_cred_contents(ctx, &store_creds);
1731 code = krb5_cc_initialize(ctx, tmp_cc, store_creds.client);
1733 krb5_cc_destroy(ctx, tmp_cc);
1734 krb5_free_cred_contents(ctx, &store_creds);
1738 code = krb5_cc_store_cred(ctx, tmp_cc, &store_creds);
1740 krb5_free_cred_contents(ctx, &store_creds);
1741 krb5_cc_destroy(ctx, tmp_cc);
1746 * we need to remember the client principal of our
1747 * TGT and make sure the KDC does not return this
1748 * in the impersonated tickets. This can happen
1749 * if the KDC does not support S4U2Self and S4U2Proxy.
1751 blacklist_principal = store_creds.client;
1752 store_creds.client = NULL;
1753 krb5_free_cred_contents(ctx, &store_creds);
1756 * Check if we also need S4U2Proxy or if S4U2Self is
1757 * enough in order to get a ticket for the target.
1759 if (target_service == NULL) {
1761 } else if (strcmp(target_service, self_service) == 0) {
1768 * For S4U2Self we need our own service principal,
1769 * which belongs to our own realm (available on
1770 * our client principal).
1772 self_realm = krb5_principal_get_realm(ctx, init_principal);
1774 code = krb5_parse_name(ctx, self_service, &self_princ);
1776 krb5_free_principal(ctx, blacklist_principal);
1777 krb5_cc_destroy(ctx, tmp_cc);
1781 code = krb5_principal_set_realm(ctx, self_princ, self_realm);
1783 krb5_free_principal(ctx, blacklist_principal);
1784 krb5_free_principal(ctx, self_princ);
1785 krb5_cc_destroy(ctx, tmp_cc);
1789 code = krb5_get_creds_opt_alloc(ctx, &options);
1791 krb5_free_principal(ctx, blacklist_principal);
1792 krb5_free_principal(ctx, self_princ);
1793 krb5_cc_destroy(ctx, tmp_cc);
1799 * If we want S4U2Proxy, we need the forwardable flag
1800 * on the S4U2Self ticket.
1802 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
1805 code = krb5_get_creds_opt_set_impersonate(ctx, options,
1806 impersonate_principal);
1808 krb5_get_creds_opt_free(ctx, options);
1809 krb5_free_principal(ctx, blacklist_principal);
1810 krb5_free_principal(ctx, self_princ);
1811 krb5_cc_destroy(ctx, tmp_cc);
1815 code = krb5_get_creds(ctx, options, tmp_cc,
1816 self_princ, &s4u2self_creds);
1817 krb5_get_creds_opt_free(ctx, options);
1818 krb5_free_principal(ctx, self_princ);
1820 krb5_free_principal(ctx, blacklist_principal);
1821 krb5_cc_destroy(ctx, tmp_cc);
1826 krb5_cc_destroy(ctx, tmp_cc);
1829 * Now make sure we store the impersonated principal
1830 * and creds instead of the TGT related stuff
1831 * in the krb5_ccache of the caller.
1833 code = krb5_copy_creds_contents(ctx, s4u2self_creds,
1835 krb5_free_creds(ctx, s4u2self_creds);
1841 * It's important to store the principal the KDC
1842 * returned, as otherwise the caller would not find
1843 * the S4U2Self ticket in the krb5_ccache lookup.
1845 store_principal = store_creds.client;
1850 * We are trying S4U2Proxy:
1852 * We need the ticket from the S4U2Self step
1853 * and our TGT in order to get the delegated ticket.
1855 code = decode_Ticket((const uint8_t *)s4u2self_creds->ticket.data,
1856 s4u2self_creds->ticket.length,
1858 &s4u2self_ticketlen);
1860 krb5_free_creds(ctx, s4u2self_creds);
1861 krb5_free_principal(ctx, blacklist_principal);
1862 krb5_cc_destroy(ctx, tmp_cc);
1867 * we need to remember the client principal of the
1868 * S4U2Self stage and as it needs to match the one we
1869 * will get for the S4U2Proxy stage. We need this
1870 * in order to detect KDCs which does not support S4U2Proxy.
1872 whitelist_principal = s4u2self_creds->client;
1873 s4u2self_creds->client = NULL;
1874 krb5_free_creds(ctx, s4u2self_creds);
1877 * For S4U2Proxy we also got a target service principal,
1878 * which also belongs to our own realm (available on
1879 * our client principal).
1881 code = krb5_parse_name(ctx, target_service, &target_princ);
1883 free_Ticket(&s4u2self_ticket);
1884 krb5_free_principal(ctx, whitelist_principal);
1885 krb5_free_principal(ctx, blacklist_principal);
1886 krb5_cc_destroy(ctx, tmp_cc);
1890 code = krb5_principal_set_realm(ctx, target_princ, self_realm);
1892 free_Ticket(&s4u2self_ticket);
1893 krb5_free_principal(ctx, target_princ);
1894 krb5_free_principal(ctx, whitelist_principal);
1895 krb5_free_principal(ctx, blacklist_principal);
1896 krb5_cc_destroy(ctx, tmp_cc);
1900 code = krb5_get_creds_opt_alloc(ctx, &options);
1902 free_Ticket(&s4u2self_ticket);
1903 krb5_free_principal(ctx, target_princ);
1904 krb5_free_principal(ctx, whitelist_principal);
1905 krb5_free_principal(ctx, blacklist_principal);
1906 krb5_cc_destroy(ctx, tmp_cc);
1910 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
1911 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_CONSTRAINED_DELEGATION);
1913 code = krb5_get_creds_opt_set_ticket(ctx, options, &s4u2self_ticket);
1914 free_Ticket(&s4u2self_ticket);
1916 krb5_get_creds_opt_free(ctx, options);
1917 krb5_free_principal(ctx, target_princ);
1918 krb5_free_principal(ctx, whitelist_principal);
1919 krb5_free_principal(ctx, blacklist_principal);
1920 krb5_cc_destroy(ctx, tmp_cc);
1924 code = krb5_get_creds(ctx, options, tmp_cc,
1925 target_princ, &s4u2proxy_creds);
1926 krb5_get_creds_opt_free(ctx, options);
1927 krb5_free_principal(ctx, target_princ);
1928 krb5_cc_destroy(ctx, tmp_cc);
1930 krb5_free_principal(ctx, whitelist_principal);
1931 krb5_free_principal(ctx, blacklist_principal);
1936 * Now make sure we store the impersonated principal
1937 * and creds instead of the TGT related stuff
1938 * in the krb5_ccache of the caller.
1940 code = krb5_copy_creds_contents(ctx, s4u2proxy_creds,
1942 krb5_free_creds(ctx, s4u2proxy_creds);
1944 krb5_free_principal(ctx, whitelist_principal);
1945 krb5_free_principal(ctx, blacklist_principal);
1950 * It's important to store the principal the KDC
1951 * returned, as otherwise the caller would not find
1952 * the S4U2Self ticket in the krb5_ccache lookup.
1954 store_principal = store_creds.client;
1957 if (blacklist_principal &&
1958 krb5_principal_compare(ctx, store_creds.client, blacklist_principal)) {
1962 code = krb5_unparse_name(ctx, blacklist_principal, &sp);
1966 code = krb5_unparse_name(ctx, impersonate_principal, &ip);
1970 DEBUG(1, ("kerberos_kinit_password_cc: "
1971 "KDC returned self principal[%s] while impersonating [%s]\n",
1972 sp?sp:"<no memory>",
1973 ip?ip:"<no memory>"));
1978 krb5_free_principal(ctx, whitelist_principal);
1979 krb5_free_principal(ctx, blacklist_principal);
1980 krb5_free_cred_contents(ctx, &store_creds);
1981 return KRB5_FWD_BAD_PRINCIPAL;
1983 if (blacklist_principal) {
1984 krb5_free_principal(ctx, blacklist_principal);
1987 if (whitelist_principal &&
1988 !krb5_principal_compare(ctx, store_creds.client, whitelist_principal)) {
1992 code = krb5_unparse_name(ctx, store_creds.client, &sp);
1996 code = krb5_unparse_name(ctx, whitelist_principal, &ep);
2000 DEBUG(1, ("kerberos_kinit_password_cc: "
2001 "KDC returned wrong principal[%s] we expected [%s]\n",
2002 sp?sp:"<no memory>",
2003 ep?ep:"<no memory>"));
2008 krb5_free_principal(ctx, whitelist_principal);
2009 krb5_free_cred_contents(ctx, &store_creds);
2010 return KRB5_FWD_BAD_PRINCIPAL;
2012 if (whitelist_principal) {
2013 krb5_free_principal(ctx, whitelist_principal);
2016 code = krb5_cc_initialize(ctx, store_cc, store_principal);
2018 krb5_free_cred_contents(ctx, &store_creds);
2022 code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
2024 krb5_free_cred_contents(ctx, &store_creds);
2029 *expire_time = (time_t) store_creds.times.endtime;
2033 *kdc_time = (time_t) store_creds.times.starttime;
2036 krb5_free_cred_contents(ctx, &store_creds);
2042 * smb_krb5_principal_get_realm
2044 * @brief Get realm of a principal
2046 * @param[in] context The krb5_context
2047 * @param[in] principal The principal
2048 * @return pointer to the realm
2052 char *smb_krb5_principal_get_realm(krb5_context context,
2053 krb5_principal principal)
2055 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2056 return discard_const_p(char, krb5_principal_get_realm(context, principal));
2057 #elif defined(krb5_princ_realm) /* MIT */
2059 realm = krb5_princ_realm(context, principal);
2060 return discard_const_p(char, realm->data);
2066 /************************************************************************
2067 Routine to get the default realm from the kerberos credentials cache.
2068 Caller must free if the return value is not NULL.
2069 ************************************************************************/
2071 static char *smb_krb5_get_default_realm_from_ccache(TALLOC_CTX *mem_ctx)
2074 krb5_context ctx = NULL;
2075 krb5_ccache cc = NULL;
2076 krb5_principal princ = NULL;
2078 initialize_krb5_error_table();
2079 if (krb5_init_context(&ctx)) {
2083 DEBUG(5,("kerberos_get_default_realm_from_ccache: "
2084 "Trying to read krb5 cache: %s\n",
2085 krb5_cc_default_name(ctx)));
2086 if (krb5_cc_default(ctx, &cc)) {
2087 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
2088 "failed to read default cache\n"));
2091 if (krb5_cc_get_principal(ctx, cc, &princ)) {
2092 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
2093 "failed to get default principal\n"));
2097 #if defined(HAVE_KRB5_PRINCIPAL_GET_REALM)
2098 realm = talloc_strdup(mem_ctx, krb5_principal_get_realm(ctx, princ));
2099 #elif defined(HAVE_KRB5_PRINC_REALM)
2101 krb5_data *realm_data = krb5_princ_realm(ctx, princ);
2102 realm = talloc_strndup(mem_ctx, realm_data->data, realm_data->length);
2110 krb5_free_principal(ctx, princ);
2113 krb5_cc_close(ctx, cc);
2115 krb5_free_context(ctx);
2121 /************************************************************************
2122 Routine to get the realm from a given DNS name.
2123 ************************************************************************/
2125 static char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
2126 const char *hostname)
2128 #if defined(HAVE_KRB5_REALM_TYPE)
2130 krb5_realm *realm_list = NULL;
2133 char **realm_list = NULL;
2136 krb5_error_code kerr;
2137 krb5_context ctx = NULL;
2139 initialize_krb5_error_table();
2140 if (krb5_init_context(&ctx)) {
2144 kerr = krb5_get_host_realm(ctx, hostname, &realm_list);
2146 DEBUG(3,("kerberos_get_realm_from_hostname %s: "
2148 hostname ? hostname : "(NULL)",
2149 error_message(kerr) ));
2153 if (realm_list && realm_list[0]) {
2154 realm = talloc_strdup(mem_ctx, realm_list[0]);
2161 krb5_free_host_realm(ctx, realm_list);
2164 krb5_free_context(ctx);
2170 char *kerberos_get_principal_from_service_hostname(TALLOC_CTX *mem_ctx,
2171 const char *service,
2172 const char *remote_name,
2173 const char *default_realm)
2178 host = strchr_m(remote_name, '.');
2181 realm = smb_krb5_get_realm_from_hostname(talloc_tos(),
2184 /* NetBIOS name - use our realm. */
2185 realm = smb_krb5_get_default_realm_from_ccache(talloc_tos());
2188 if (realm == NULL || *realm == '\0') {
2189 realm = talloc_strdup(talloc_tos(), default_realm);
2193 DEBUG(3,("kerberos_get_principal_from_service_hostname: "
2194 "cannot get realm from, "
2195 "desthost %s or default ccache. Using default "
2196 "smb.conf realm %s\n",
2201 principal = talloc_asprintf(mem_ctx,
2203 service, remote_name,
2209 char *smb_get_krb5_error_message(krb5_context context,
2210 krb5_error_code code,
2211 TALLOC_CTX *mem_ctx)
2215 #if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
2216 const char *context_error = krb5_get_error_message(context, code);
2217 if (context_error) {
2218 ret = talloc_asprintf(mem_ctx, "%s: %s",
2219 error_message(code), context_error);
2220 krb5_free_error_message(context, context_error);
2224 ret = talloc_strdup(mem_ctx, error_message(code));
2228 #else /* HAVE_KRB5 */
2229 /* this saves a few linking headaches */
2230 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
2231 const char *principal, time_t time_offset,
2232 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
2233 uint32_t extra_ap_opts,
2234 const char *ccname, time_t *tgs_expire,
2235 const char *impersonate_princ_s)
2237 DEBUG(0,("NO KERBEROS SUPPORT\n"));
2241 #endif /* HAVE_KRB5 */