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 "system/filesys.h"
25 #include "krb5_samba.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))
59 #define SMB_STRDUP(s) strdup(s)
62 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
64 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
66 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
67 * to krb5_set_default_tgs_ktypes. See
68 * http://lists.samba.org/archive/samba-technical/2006-July/048271.html
70 * If the MIT libraries are not exporting internal symbols, we will end up in
71 * this branch, which is correct. Otherwise we will continue to use the
74 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
76 return krb5_set_default_tgs_enctypes(ctx, enc);
79 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
82 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
84 return krb5_set_default_in_tkt_etypes(ctx, enc);
87 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
89 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
91 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
93 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
95 memset(pkaddr, '\0', sizeof(krb5_address));
96 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
97 if (paddr->ss_family == AF_INET6) {
98 pkaddr->addr_type = KRB5_ADDRESS_INET6;
99 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
100 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
104 if (paddr->ss_family == AF_INET) {
105 pkaddr->addr_type = KRB5_ADDRESS_INET;
106 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
107 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
112 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
114 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
116 memset(pkaddr, '\0', sizeof(krb5_address));
117 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
118 if (paddr->ss_family == AF_INET6) {
119 pkaddr->addrtype = ADDRTYPE_INET6;
120 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
121 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
125 if (paddr->ss_family == AF_INET) {
126 pkaddr->addrtype = ADDRTYPE_INET;
127 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
128 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
134 #error UNKNOWN_ADDRTYPE
138 * @brief Create a keyblock based on input parameters
140 * @param context The krb5_context
141 * @param host_princ The krb5_principal to use
142 * @param salt The optional salt, if ommitted, salt is calculated with
143 * the provided principal.
144 * @param password The krb5_data containing the password
145 * @param enctype The krb5_enctype to use for the keyblock generation
146 * @param key The returned krb5_keyblock, caller needs to free with
147 * krb5_free_keyblock().
149 * @return krb5_error_code
151 int smb_krb5_create_key_from_string(krb5_context context,
152 krb5_principal *host_princ,
155 krb5_enctype enctype,
160 if (host_princ == NULL && salt == NULL) {
164 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_C_STRING_TO_KEY)
169 ret = krb5_principal2salt(context, *host_princ, &_salt);
171 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
177 ret = krb5_c_string_to_key(context, enctype, password, &_salt, key);
179 SAFE_FREE(_salt.data);
182 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
187 ret = krb5_get_pw_salt(context, *host_princ, &_salt);
189 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
193 _salt.saltvalue = *salt;
194 _salt.salttype = KRB5_PW_SALT;
197 ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, _salt, key);
199 krb5_free_salt(context, _salt);
203 #error UNKNOWN_CREATE_KEY_FUNCTIONS
209 * @brief Create a salt for a given principal
211 * @param context The initialized krb5_context
212 * @param host_princ The krb5_principal to create the salt for
213 * @param psalt A pointer to a krb5_data struct
215 * caller has to free the contents of psalt with kerberos_free_data_contents
216 * when function has succeeded
218 * @return krb5_error_code, returns 0 on success, error code otherwise
221 int smb_krb5_get_pw_salt(krb5_context context,
222 krb5_principal host_princ,
224 #if defined(HAVE_KRB5_GET_PW_SALT)
230 ret = krb5_get_pw_salt(context, host_princ, &salt);
235 psalt->data = salt.saltvalue.data;
236 psalt->length = salt.saltvalue.length;
240 #elif defined(HAVE_KRB5_PRINCIPAL2SALT)
243 return krb5_principal2salt(context, host_princ, psalt);
246 #error UNKNOWN_SALT_FUNCTIONS
249 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
250 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
251 krb5_enctype **enctypes)
253 return krb5_get_permitted_enctypes(context, enctypes);
255 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
256 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
257 krb5_enctype **enctypes)
259 #ifdef HAVE_KRB5_PDU_NONE_DECL
260 return krb5_get_default_in_tkt_etypes(context, KRB5_PDU_NONE, enctypes);
262 return krb5_get_default_in_tkt_etypes(context, enctypes);
266 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
269 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
270 krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
271 krb5_auth_context auth_context,
272 krb5_keyblock *keyblock)
274 return krb5_auth_con_setkey(context, auth_context, keyblock);
278 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
280 DATA_BLOB *edata_out)
282 DATA_BLOB edata_contents;
286 if (!edata->length) {
290 data = asn1_init(mem_ctx);
295 asn1_load(data, *edata);
296 asn1_start_tag(data, ASN1_SEQUENCE(0));
297 asn1_start_tag(data, ASN1_CONTEXT(1));
298 asn1_read_Integer(data, &edata_type);
300 if (edata_type != KRB5_PADATA_PW_SALT) {
301 DEBUG(0,("edata is not of required type %d but of type %d\n",
302 KRB5_PADATA_PW_SALT, edata_type));
307 asn1_start_tag(data, ASN1_CONTEXT(2));
308 asn1_read_OctetString(data, talloc_tos(), &edata_contents);
314 *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
316 data_blob_free(&edata_contents);
322 static bool ads_cleanup_expired_creds(krb5_context context,
326 krb5_error_code retval;
327 const char *cc_type = krb5_cc_get_type(context, ccache);
329 DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
330 cc_type, krb5_cc_get_name(context, ccache),
331 http_timestring(talloc_tos(), credsp->times.endtime)));
333 /* we will probably need new tickets if the current ones
334 will expire within 10 seconds.
336 if (credsp->times.endtime >= (time(NULL) + 10))
339 /* heimdal won't remove creds from a file ccache, and
340 perhaps we shouldn't anyway, since internally we
341 use memory ccaches, and a FILE one probably means that
342 we're using creds obtained outside of our exectuable
344 if (strequal(cc_type, "FILE")) {
345 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
349 retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
351 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
352 error_message(retval)));
353 /* If we have an error in this, we want to display it,
354 but continue as though we deleted it */
359 /* Allocate and setup the auth context into the state we need. */
361 static krb5_error_code setup_auth_context(krb5_context context,
362 krb5_auth_context *auth_context)
364 krb5_error_code retval;
366 retval = krb5_auth_con_init(context, auth_context );
368 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
369 error_message(retval)));
373 /* Ensure this is an addressless ticket. */
374 retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
376 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
377 error_message(retval)));
383 #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)
384 static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
387 unsigned int orig_length = in_data->length;
388 unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
389 char *gss_cksum = NULL;
392 /* Extra length field for delgated ticket. */
393 base_cksum_size += 4;
396 if ((unsigned int)base_cksum_size + orig_length <
397 (unsigned int)base_cksum_size) {
401 gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
402 if (gss_cksum == NULL) {
406 memset(gss_cksum, '\0', base_cksum_size + orig_length);
407 SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
410 * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
411 * This matches the behavior of heimdal and mit.
413 * And it is needed to work against some closed source
418 memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
420 SIVAL(gss_cksum, 20, gss_flags);
423 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
424 SSVAL(gss_cksum, 26, orig_length);
425 /* Copy the kerberos KRB_CRED data */
426 memcpy(gss_cksum + 28, in_data->data, orig_length);
428 in_data->data = NULL;
431 in_data->data = gss_cksum;
432 in_data->length = base_cksum_size + orig_length;
437 /**************************************************************
438 krb5_parse_name that takes a UNIX charset.
439 **************************************************************/
441 krb5_error_code smb_krb5_parse_name(krb5_context context,
442 const char *name, /* in unix charset */
443 krb5_principal *principal)
447 size_t converted_size;
448 TALLOC_CTX *frame = talloc_stackframe();
450 if (!push_utf8_talloc(frame, &utf8_name, name, &converted_size)) {
455 ret = krb5_parse_name(context, utf8_name, principal);
460 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
461 void krb5_free_unparsed_name(krb5_context context, char *val)
467 /**************************************************************
468 krb5_parse_name that returns a UNIX charset name. Must
469 be freed with talloc_free() call.
470 **************************************************************/
472 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
473 krb5_context context,
474 krb5_const_principal principal,
479 size_t converted_size;
482 ret = krb5_unparse_name(context, principal, &utf8_name);
487 if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
488 krb5_free_unparsed_name(context, utf8_name);
491 krb5_free_unparsed_name(context, utf8_name);
495 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
497 krb5_principal *principal)
499 /* we are cheating here because parse_name will in fact set the realm.
500 * We don't care as the only caller of smb_krb5_parse_name_norealm
501 * ignores the realm anyway when calling
502 * smb_krb5_principal_compare_any_realm later - Guenther */
504 return smb_krb5_parse_name(context, name, principal);
507 bool smb_krb5_principal_compare_any_realm(krb5_context context,
508 krb5_const_principal princ1,
509 krb5_const_principal princ2)
511 return krb5_principal_compare_any_realm(context, princ1, princ2);
515 we can't use krb5_mk_req because w2k wants the service to be in a particular format
517 static krb5_error_code ads_krb5_mk_req(krb5_context context,
518 krb5_auth_context *auth_context,
519 const krb5_flags ap_req_options,
520 const char *principal,
524 const char *impersonate_princ_s)
526 krb5_error_code retval;
527 krb5_principal server;
528 krb5_principal impersonate_princ = NULL;
532 bool creds_ready = false;
533 int i = 0, maxtries = 3;
535 ZERO_STRUCT(in_data);
537 retval = smb_krb5_parse_name(context, principal, &server);
539 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
543 if (impersonate_princ_s) {
544 retval = smb_krb5_parse_name(context, impersonate_princ_s,
547 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
552 /* obtain ticket & session key */
554 if ((retval = krb5_copy_principal(context, server, &creds.server))) {
555 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
556 error_message(retval)));
560 if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
561 /* This can commonly fail on smbd startup with no ticket in the cache.
562 * Report at higher level than 1. */
563 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
564 error_message(retval)));
568 while (!creds_ready && (i < maxtries)) {
570 if ((retval = smb_krb5_get_credentials(context, ccache,
575 DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
576 principal, error_message(retval)));
580 /* cope with ticket being in the future due to clock skew */
581 if ((unsigned)credsp->times.starttime > time(NULL)) {
582 time_t t = time(NULL);
583 int time_offset =(int)((unsigned)credsp->times.starttime-t);
584 DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
585 krb5_set_real_time(context, t + time_offset + 1, 0);
588 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
595 DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
596 principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
597 http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
598 (unsigned)credsp->times.endtime));
601 *expire_time = (time_t)credsp->times.endtime;
604 /* Allocate the auth_context. */
605 retval = setup_auth_context(context, auth_context);
607 DEBUG(1,("setup_auth_context failed (%s)\n",
608 error_message(retval)));
612 #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)
614 uint32_t gss_flags = 0;
616 if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
617 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
618 as part of the kerberos exchange. */
620 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n") );
622 retval = krb5_auth_con_setuseruserkey(context,
626 DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
627 error_message(retval)));
631 /* Must use a subkey for forwarded tickets. */
632 retval = krb5_auth_con_setflags(context,
634 KRB5_AUTH_CONTEXT_USE_SUBKEY);
636 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
637 error_message(retval)));
641 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
642 *auth_context, /* Authentication context [in] */
643 discard_const_p(char, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
644 credsp->client, /* Client principal for the tgt [in] */
645 credsp->server, /* Server principal for the tgt [in] */
646 ccache, /* Credential cache to use for storage [in] */
647 1, /* Turn on for "Forwardable ticket" [in] */
648 &in_data ); /* Resulting response [out] */
651 DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
652 error_message( retval ) ) );
655 * This is not fatal. Delete the *auth_context and continue
656 * with krb5_mk_req_extended to get a non-forwardable ticket.
660 free( in_data.data );
664 krb5_auth_con_free(context, *auth_context);
665 *auth_context = NULL;
666 retval = setup_auth_context(context, auth_context);
668 DEBUG(1,("setup_auth_context failed (%s)\n",
669 error_message(retval)));
673 /* We got a delegated ticket. */
674 gss_flags |= GSS_C_DELEG_FLAG;
678 /* Frees and reallocates in_data into a GSS checksum blob. */
679 retval = create_gss_checksum(&in_data, gss_flags);
684 /* We always want GSS-checksum types. */
685 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
687 DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
688 error_message(retval)));
694 retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
695 &in_data, credsp, outbuf);
697 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
698 error_message(retval)));
701 #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)
706 free( in_data.data );
710 krb5_free_creds(context, credsp);
713 krb5_free_cred_contents(context, &creds);
716 krb5_free_principal(context, server);
717 if (impersonate_princ) {
718 krb5_free_principal(context, impersonate_princ);
724 void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
726 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
728 krb5_free_data_contents(context, pdata);
730 #elif defined(HAVE_KRB5_DATA_FREE)
731 krb5_data_free(context, pdata);
733 SAFE_FREE(pdata->data);
738 get a kerberos5 ticket for the given service
740 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
741 const char *principal, time_t time_offset,
742 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
743 uint32_t extra_ap_opts, const char *ccname,
745 const char *impersonate_princ_s)
748 krb5_error_code retval;
750 krb5_context context = NULL;
751 krb5_ccache ccdef = NULL;
752 krb5_auth_context auth_context = NULL;
753 krb5_enctype enc_types[] = {
754 #ifdef HAVE_ENCTYPE_AES256_CTS_HMAC_SHA1_96
755 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
757 #ifdef HAVE_ENCTYPE_AES128_CTS_HMAC_SHA1_96
758 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
760 ENCTYPE_ARCFOUR_HMAC,
765 initialize_krb5_error_table();
766 retval = krb5_init_context(&context);
768 DEBUG(1, ("krb5_init_context failed (%s)\n",
769 error_message(retval)));
773 if (time_offset != 0) {
774 krb5_set_real_time(context, time(NULL) + time_offset, 0);
777 if ((retval = krb5_cc_resolve(context, ccname ?
778 ccname : krb5_cc_default_name(context), &ccdef))) {
779 DEBUG(1, ("krb5_cc_default failed (%s)\n",
780 error_message(retval)));
784 if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
785 DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
786 error_message(retval)));
790 retval = ads_krb5_mk_req(context, &auth_context,
791 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
792 principal, ccdef, &packet,
793 tgs_expire, impersonate_princ_s);
798 get_krb5_smb_session_key(mem_ctx, context, auth_context,
799 session_key_krb5, false);
801 *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
803 kerberos_free_data_contents(context, &packet);
809 krb5_cc_close(context, ccdef);
811 krb5_auth_con_free(context, auth_context);
812 krb5_free_context(context);
818 bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
819 krb5_context context,
820 krb5_auth_context auth_context,
821 DATA_BLOB *session_key, bool remote)
823 krb5_keyblock *skey = NULL;
824 krb5_error_code err = 0;
828 err = krb5_auth_con_getremotesubkey(context,
829 auth_context, &skey);
831 err = krb5_auth_con_getlocalsubkey(context,
832 auth_context, &skey);
835 if (err || skey == NULL) {
836 DEBUG(10, ("KRB5 error getting session key %d\n", err));
840 DEBUG(10, ("Got KRB5 session key of length %d\n",
841 (int)KRB5_KEY_LENGTH(skey)));
843 *session_key = data_blob_talloc(mem_ctx,
845 KRB5_KEY_LENGTH(skey));
846 dump_data_pw("KRB5 Session Key:\n",
848 session_key->length);
854 krb5_free_keyblock(context, skey);
861 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
862 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
864 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
866 static krb5_data kdata;
868 kdata.data = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i));
869 kdata.length = strlen((const char *)kdata.data);
875 * @brief Get talloced string component of a principal
877 * @param[in] mem_ctx The TALLOC_CTX
878 * @param[in] context The krb5_context
879 * @param[in] principal The principal
880 * @param[in] component The component
881 * @return string component
883 * Caller must talloc_free if the return value is not NULL.
887 /* caller has to free returned string with free() */
888 char *smb_krb5_principal_get_comp_string(TALLOC_CTX *mem_ctx,
889 krb5_context context,
890 krb5_const_principal principal,
891 unsigned int component)
893 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING)
894 return talloc_strdup(mem_ctx, krb5_principal_get_comp_string(context, principal, component));
898 if (component >= krb5_princ_size(context, principal)) {
902 data = krb5_princ_component(context, principal, component);
907 return talloc_strndup(mem_ctx, data->data, data->length);
913 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, /* FILE:/tmp/krb5cc_0 */
914 const char *client_string, /* gd@BER.SUSE.DE */
915 const char *service_string, /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
919 krb5_context context = NULL;
920 krb5_ccache ccache = NULL;
921 krb5_principal client = NULL;
922 krb5_creds creds, creds_in;
925 ZERO_STRUCT(creds_in);
927 initialize_krb5_error_table();
928 ret = krb5_init_context(&context);
933 if (!ccache_string) {
934 ccache_string = krb5_cc_default_name(context);
937 if (!ccache_string) {
942 DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
944 /* FIXME: we should not fall back to defaults */
945 ret = krb5_cc_resolve(context, discard_const_p(char, ccache_string), &ccache);
951 ret = smb_krb5_parse_name(context, client_string, &client);
956 ret = krb5_cc_get_principal(context, ccache, &client);
962 ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string));
964 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
968 /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
969 ret = krb5_cc_initialize(context, ccache, client);
974 ret = krb5_cc_store_cred(context, ccache, &creds);
977 *expire_time = (time_t) creds.times.endtime;
981 krb5_free_cred_contents(context, &creds_in);
982 krb5_free_cred_contents(context, &creds);
985 krb5_free_principal(context, client);
988 krb5_cc_close(context, ccache);
991 krb5_free_context(context);
997 krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
999 krb5_error_code ret = 0;
1003 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1004 krb5_free_addresses(context, addr->addrs);
1005 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1006 ret = krb5_free_addresses(context, addr->addrs);
1007 SAFE_FREE(addr->addrs);
1014 #define MAX_NETBIOSNAME_LEN 16
1015 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr,
1016 const char *netbios_name)
1018 krb5_error_code ret = 0;
1019 char buf[MAX_NETBIOSNAME_LEN];
1021 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1022 krb5_address **addrs = NULL;
1023 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1024 krb5_addresses *addrs = NULL;
1027 *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1028 if (*kerb_addr == NULL) {
1032 /* temporarily duplicate put_name() code here to avoid dependency
1033 * issues for a 5 lines function */
1034 len = strlen(netbios_name);
1035 memcpy(buf, netbios_name,
1036 (len < MAX_NETBIOSNAME_LEN) ? len : MAX_NETBIOSNAME_LEN - 1);
1037 if (len < MAX_NETBIOSNAME_LEN - 1) {
1038 memset(buf + len, ' ', MAX_NETBIOSNAME_LEN - 1 - len);
1040 buf[MAX_NETBIOSNAME_LEN - 1] = 0x20;
1042 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1046 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1047 if (addrs == NULL) {
1048 SAFE_FREE(*kerb_addr);
1052 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1054 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1055 if (addrs[0] == NULL) {
1057 SAFE_FREE(*kerb_addr);
1061 addrs[0]->magic = KV5M_ADDRESS;
1062 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1063 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1064 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1065 if (addrs[0]->contents == NULL) {
1066 SAFE_FREE(addrs[0]);
1068 SAFE_FREE(*kerb_addr);
1072 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1076 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1078 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1079 if (addrs == NULL) {
1080 SAFE_FREE(*kerb_addr);
1084 memset(addrs, 0, sizeof(krb5_addresses));
1087 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1088 if (addrs->val == NULL) {
1090 SAFE_FREE(kerb_addr);
1094 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1095 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1096 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1097 if (addrs->val[0].address.data == NULL) {
1098 SAFE_FREE(addrs->val);
1100 SAFE_FREE(*kerb_addr);
1104 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1107 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1109 (*kerb_addr)->addrs = addrs;
1114 void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1116 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1117 krb5_free_error_contents(context, krberror);
1119 krb5_free_error(context, krberror);
1123 krb5_error_code handle_krberror_packet(krb5_context context,
1126 krb5_error_code ret;
1127 bool got_error_code = false;
1129 DEBUG(10,("handle_krberror_packet: got error packet\n"));
1131 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1133 krb5_error krberror;
1135 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1136 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1137 error_message(ret)));
1141 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1142 ret = (krb5_error_code) krberror.error_code;
1143 got_error_code = true;
1146 smb_krb5_free_error(context, &krberror);
1150 krb5_error *krberror;
1152 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1153 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1154 error_message(ret)));
1158 if (krberror->e_data.data == NULL) {
1159 #if defined(ERROR_TABLE_BASE_krb5)
1160 ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1162 ret = (krb5_error_code)krberror->error;
1164 got_error_code = true;
1166 smb_krb5_free_error(context, krberror);
1169 if (got_error_code) {
1170 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1171 error_message(ret), ret));
1176 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1177 krb5_get_init_creds_opt **opt)
1179 /* Heimdal or modern MIT version */
1180 return krb5_get_init_creds_opt_alloc(context, opt);
1183 void smb_krb5_get_init_creds_opt_free(krb5_context context,
1184 krb5_get_init_creds_opt *opt)
1186 /* Modern MIT or Heimdal version */
1187 krb5_get_init_creds_opt_free(context, opt);
1190 krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1192 return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1195 krb5_error_code smb_krb5_kt_free_entry(krb5_context context,
1196 krb5_keytab_entry *kt_entry)
1198 /* Try krb5_free_keytab_entry_contents first, since
1199 * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
1200 * krb5_kt_free_entry but only has a prototype for the first, while the
1201 * second is considered private.
1203 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
1204 return krb5_free_keytab_entry_contents(context, kt_entry);
1205 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
1206 return krb5_kt_free_entry(context, kt_entry);
1208 #error UNKNOWN_KT_FREE_FUNCTION
1213 /* caller needs to free etype_s */
1214 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1215 krb5_enctype enctype,
1218 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1219 return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1220 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1222 krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1226 *etype_s = SMB_STRDUP(buf);
1232 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1236 /**********************************************************************
1237 * Open a krb5 keytab with flags, handles readonly or readwrite access and
1238 * allows to process non-default keytab names.
1239 * @param context krb5_context
1240 * @param keytab_name_req string
1241 * @param write_access bool if writable keytab is required
1242 * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1243 * @return krb5_error_code
1244 **********************************************************************/
1246 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1247 #ifndef MAX_KEYTAB_NAME_LEN
1248 #define MAX_KEYTAB_NAME_LEN 1100
1251 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1252 const char *keytab_name_req,
1254 krb5_keytab *keytab)
1256 krb5_error_code ret = 0;
1257 TALLOC_CTX *mem_ctx;
1258 char keytab_string[MAX_KEYTAB_NAME_LEN];
1259 char *kt_str = NULL;
1260 bool found_valid_name = false;
1261 const char *pragma = "FILE";
1262 const char *tmp = NULL;
1264 if (!write_access && !keytab_name_req) {
1265 /* caller just wants to read the default keytab readonly, so be it */
1266 return krb5_kt_default(context, keytab);
1269 mem_ctx = talloc_init("smb_krb5_open_keytab");
1274 #ifdef HAVE_WRFILE_KEYTAB
1280 if (keytab_name_req) {
1282 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1283 ret = KRB5_CONFIG_NOTENUFSPACE;
1287 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1288 (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1289 tmp = keytab_name_req;
1293 if (keytab_name_req[0] != '/') {
1294 ret = KRB5_KT_BADNAME;
1298 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1307 /* we need to handle more complex keytab_strings, like:
1308 * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1310 ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1315 DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1317 tmp = talloc_strdup(mem_ctx, keytab_string);
1323 if (strncmp(tmp, "ANY:", 4) == 0) {
1327 memset(&keytab_string, '\0', sizeof(keytab_string));
1329 while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1330 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1331 found_valid_name = true;
1336 if (strncmp(kt_str, "FILE:", 5) == 0) {
1337 found_valid_name = true;
1342 if (tmp[0] == '/') {
1343 /* Treat as a FILE: keytab definition. */
1344 found_valid_name = true;
1347 if (found_valid_name) {
1348 if (tmp[0] != '/') {
1349 ret = KRB5_KT_BADNAME;
1353 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1362 if (!found_valid_name) {
1363 ret = KRB5_KT_UNKNOWN_TYPE;
1368 DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1369 ret = krb5_kt_resolve(context, tmp, keytab);
1372 TALLOC_FREE(mem_ctx);
1376 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1377 krb5_context context,
1379 const char **keytab_name)
1381 char keytab_string[MAX_KEYTAB_NAME_LEN];
1382 krb5_error_code ret = 0;
1384 ret = krb5_kt_get_name(context, keytab,
1385 keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1390 *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1391 if (!*keytab_name) {
1398 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1399 defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1400 defined(HAVE_KRB5_GET_CREDS)
1401 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1404 krb5_principal server,
1405 krb5_principal impersonate_princ,
1406 krb5_creds **out_creds)
1408 krb5_error_code ret;
1409 krb5_get_creds_opt opt;
1411 ret = krb5_get_creds_opt_alloc(context, &opt);
1415 krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1417 if (impersonate_princ) {
1418 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1425 ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1432 krb5_get_creds_opt_free(context, opt);
1436 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1438 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1440 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1441 krb5_error_code KRB5_CALLCONV
1442 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1443 krb5_ccache ccache, krb5_creds *in_creds,
1444 krb5_data *subject_cert,
1445 krb5_creds **out_creds);
1446 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1448 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1451 krb5_principal server,
1452 krb5_principal impersonate_princ,
1453 krb5_creds **out_creds)
1455 krb5_error_code ret;
1456 krb5_creds in_creds;
1458 ZERO_STRUCT(in_creds);
1460 if (impersonate_princ) {
1462 in_creds.server = me;
1463 in_creds.client = impersonate_princ;
1465 ret = krb5_get_credentials_for_user(context,
1466 0, /* krb5_flags options */
1469 NULL, /* krb5_data *subject_cert */
1472 in_creds.client = me;
1473 in_creds.server = server;
1475 ret = krb5_get_credentials(context, 0, ccache,
1476 &in_creds, out_creds);
1481 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1484 * smb_krb5_get_credentials
1486 * @brief Get krb5 credentials for a server
1488 * @param[in] context An initialized krb5_context
1489 * @param[in] ccache An initialized krb5_ccache
1490 * @param[in] me The krb5_principal of the caller
1491 * @param[in] server The krb5_principal of the requested service
1492 * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1493 * @param[out] out_creds The returned krb5_creds structure
1494 * @return krb5_error_code
1497 krb5_error_code smb_krb5_get_credentials(krb5_context context,
1500 krb5_principal server,
1501 krb5_principal impersonate_princ,
1502 krb5_creds **out_creds)
1504 krb5_error_code ret;
1505 krb5_creds *creds = NULL;
1507 if (out_creds != NULL) {
1511 if (impersonate_princ) {
1512 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
1513 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
1514 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
1515 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
1520 krb5_creds in_creds;
1522 ZERO_STRUCT(in_creds);
1524 in_creds.client = me;
1525 in_creds.server = server;
1527 ret = krb5_get_credentials(context, 0, ccache,
1540 krb5_free_creds(context, creds);
1546 krb5_error_code smb_krb5_keyblock_init_contents(krb5_context context,
1547 krb5_enctype enctype,
1552 #if defined(HAVE_KRB5_KEYBLOCK_INIT)
1553 return krb5_keyblock_init(context, enctype, data, length, key);
1555 memset(key, 0, sizeof(krb5_keyblock));
1556 KRB5_KEY_DATA(key) = SMB_MALLOC(length);
1557 if (NULL == KRB5_KEY_DATA(key)) {
1560 memcpy(KRB5_KEY_DATA(key), data, length);
1561 KRB5_KEY_LENGTH(key) = length;
1562 KRB5_KEY_TYPE(key) = enctype;
1568 simulate a kinit, putting the tgt in the given credentials cache.
1569 Orignally by remus@snapserver.com
1571 This version is built to use a keyblock, rather than needing the
1574 The impersonate_principal is the principal if NULL, or the principal
1577 The target_service defaults to the krbtgt if NULL, but could be
1578 kpasswd/realm or the local service (if we are doing s4u2self)
1580 krb5_error_code kerberos_kinit_keyblock_cc(krb5_context ctx, krb5_ccache cc,
1581 krb5_principal principal,
1582 krb5_keyblock *keyblock,
1583 const char *target_service,
1584 krb5_get_init_creds_opt *krb_options,
1585 time_t *expire_time,
1588 krb5_error_code code = 0;
1589 krb5_creds my_creds;
1591 #if defined(HAVE_KRB5_GET_INIT_CREDS_KEYBLOCK)
1592 code = krb5_get_init_creds_keyblock(ctx, &my_creds, principal,
1593 keyblock, 0, target_service,
1595 #elif defined(HAVE_KRB5_GET_INIT_CREDS_KEYTAB)
1597 #define SMB_CREDS_KEYTAB "MEMORY:tmp_smb_creds_XXXXXX"
1598 char tmp_name[sizeof(SMB_CREDS_KEYTAB)];
1599 krb5_keytab_entry entry;
1603 memset(&entry, 0, sizeof(entry));
1604 entry.principal = principal;
1605 *(KRB5_KT_KEY(&entry)) = *keyblock;
1607 memcpy(tmp_name, SMB_CREDS_KEYTAB, sizeof(SMB_CREDS_KEYTAB));
1608 mask = umask(S_IRWXO | S_IRWXG);
1611 if (tmp_name[0] == 0) {
1612 return KRB5_KT_BADNAME;
1614 code = krb5_kt_resolve(ctx, tmp_name, &keytab);
1619 code = krb5_kt_add_entry(ctx, keytab, &entry);
1621 (void)krb5_kt_close(ctx, keytab);
1625 code = krb5_get_init_creds_keytab(ctx, &my_creds, principal,
1626 keytab, 0, target_service,
1628 (void)krb5_kt_close(ctx, keytab);
1631 #error krb5_get_init_creds_keyblock not available!
1637 code = krb5_cc_initialize(ctx, cc, principal);
1642 code = krb5_cc_store_cred(ctx, cc, &my_creds);
1648 *expire_time = (time_t) my_creds.times.endtime;
1652 *kdc_time = (time_t) my_creds.times.starttime;
1657 krb5_free_cred_contents(ctx, &my_creds);
1661 krb5_error_code kerberos_kinit_password_cc(krb5_context ctx, krb5_ccache cc,
1662 krb5_principal principal,
1663 const char *password,
1664 const char *target_service,
1665 krb5_get_init_creds_opt *krb_options,
1666 time_t *expire_time,
1669 krb5_error_code code = 0;
1670 krb5_creds my_creds;
1672 code = krb5_get_init_creds_password(ctx, &my_creds, principal,
1673 password, NULL, NULL, 0,
1674 target_service, krb_options);
1679 code = krb5_cc_initialize(ctx, cc, principal);
1684 code = krb5_cc_store_cred(ctx, cc, &my_creds);
1690 *expire_time = (time_t) my_creds.times.endtime;
1694 *kdc_time = (time_t) my_creds.times.starttime;
1699 krb5_free_cred_contents(ctx, &my_creds);
1703 #ifdef SAMBA4_USES_HEIMDAL
1705 simulate a kinit, putting the tgt in the given credentials cache.
1706 Orignally by remus@snapserver.com
1708 The impersonate_principal is the principal
1710 The self_service, should be the local service (for S4U2Self if
1711 impersonate_principal is given).
1713 The target_service defaults to the krbtgt if NULL, but could be
1714 kpasswd/realm or a remote service (for S4U2Proxy)
1717 krb5_error_code kerberos_kinit_s4u2_cc(krb5_context ctx,
1718 krb5_ccache store_cc,
1719 krb5_principal init_principal,
1720 const char *init_password,
1721 krb5_principal impersonate_principal,
1722 const char *self_service,
1723 const char *target_service,
1724 krb5_get_init_creds_opt *krb_options,
1725 time_t *expire_time,
1728 krb5_error_code code = 0;
1729 krb5_get_creds_opt options;
1730 krb5_principal store_principal;
1731 krb5_creds store_creds;
1732 krb5_creds *s4u2self_creds;
1733 Ticket s4u2self_ticket;
1734 size_t s4u2self_ticketlen;
1735 krb5_creds *s4u2proxy_creds;
1736 krb5_principal self_princ;
1738 krb5_principal target_princ;
1740 const char *self_realm;
1741 krb5_principal blacklist_principal = NULL;
1742 krb5_principal whitelist_principal = NULL;
1744 code = krb5_get_init_creds_password(ctx, &store_creds,
1755 store_principal = init_principal;
1758 * We are trying S4U2Self now:
1760 * As we do not want to expose our TGT in the
1761 * krb5_ccache, which is also holds the impersonated creds.
1763 * Some low level krb5/gssapi function might use the TGT
1764 * identity and let the client act as our machine account.
1766 * We need to avoid that and use a temporary krb5_ccache
1767 * in order to pass our TGT to the krb5_get_creds() function.
1769 code = krb5_cc_new_unique(ctx, NULL, NULL, &tmp_cc);
1771 krb5_free_cred_contents(ctx, &store_creds);
1775 code = krb5_cc_initialize(ctx, tmp_cc, store_creds.client);
1777 krb5_cc_destroy(ctx, tmp_cc);
1778 krb5_free_cred_contents(ctx, &store_creds);
1782 code = krb5_cc_store_cred(ctx, tmp_cc, &store_creds);
1784 krb5_free_cred_contents(ctx, &store_creds);
1785 krb5_cc_destroy(ctx, tmp_cc);
1790 * we need to remember the client principal of our
1791 * TGT and make sure the KDC does not return this
1792 * in the impersonated tickets. This can happen
1793 * if the KDC does not support S4U2Self and S4U2Proxy.
1795 blacklist_principal = store_creds.client;
1796 store_creds.client = NULL;
1797 krb5_free_cred_contents(ctx, &store_creds);
1800 * Check if we also need S4U2Proxy or if S4U2Self is
1801 * enough in order to get a ticket for the target.
1803 if (target_service == NULL) {
1805 } else if (strcmp(target_service, self_service) == 0) {
1812 * For S4U2Self we need our own service principal,
1813 * which belongs to our own realm (available on
1814 * our client principal).
1816 self_realm = krb5_principal_get_realm(ctx, init_principal);
1818 code = krb5_parse_name(ctx, self_service, &self_princ);
1820 krb5_free_principal(ctx, blacklist_principal);
1821 krb5_cc_destroy(ctx, tmp_cc);
1825 code = krb5_principal_set_realm(ctx, self_princ, self_realm);
1827 krb5_free_principal(ctx, blacklist_principal);
1828 krb5_free_principal(ctx, self_princ);
1829 krb5_cc_destroy(ctx, tmp_cc);
1833 code = krb5_get_creds_opt_alloc(ctx, &options);
1835 krb5_free_principal(ctx, blacklist_principal);
1836 krb5_free_principal(ctx, self_princ);
1837 krb5_cc_destroy(ctx, tmp_cc);
1843 * If we want S4U2Proxy, we need the forwardable flag
1844 * on the S4U2Self ticket.
1846 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
1849 code = krb5_get_creds_opt_set_impersonate(ctx, options,
1850 impersonate_principal);
1852 krb5_get_creds_opt_free(ctx, options);
1853 krb5_free_principal(ctx, blacklist_principal);
1854 krb5_free_principal(ctx, self_princ);
1855 krb5_cc_destroy(ctx, tmp_cc);
1859 code = krb5_get_creds(ctx, options, tmp_cc,
1860 self_princ, &s4u2self_creds);
1861 krb5_get_creds_opt_free(ctx, options);
1862 krb5_free_principal(ctx, self_princ);
1864 krb5_free_principal(ctx, blacklist_principal);
1865 krb5_cc_destroy(ctx, tmp_cc);
1870 krb5_cc_destroy(ctx, tmp_cc);
1873 * Now make sure we store the impersonated principal
1874 * and creds instead of the TGT related stuff
1875 * in the krb5_ccache of the caller.
1877 code = krb5_copy_creds_contents(ctx, s4u2self_creds,
1879 krb5_free_creds(ctx, s4u2self_creds);
1885 * It's important to store the principal the KDC
1886 * returned, as otherwise the caller would not find
1887 * the S4U2Self ticket in the krb5_ccache lookup.
1889 store_principal = store_creds.client;
1894 * We are trying S4U2Proxy:
1896 * We need the ticket from the S4U2Self step
1897 * and our TGT in order to get the delegated ticket.
1899 code = decode_Ticket((const uint8_t *)s4u2self_creds->ticket.data,
1900 s4u2self_creds->ticket.length,
1902 &s4u2self_ticketlen);
1904 krb5_free_creds(ctx, s4u2self_creds);
1905 krb5_free_principal(ctx, blacklist_principal);
1906 krb5_cc_destroy(ctx, tmp_cc);
1911 * we need to remember the client principal of the
1912 * S4U2Self stage and as it needs to match the one we
1913 * will get for the S4U2Proxy stage. We need this
1914 * in order to detect KDCs which does not support S4U2Proxy.
1916 whitelist_principal = s4u2self_creds->client;
1917 s4u2self_creds->client = NULL;
1918 krb5_free_creds(ctx, s4u2self_creds);
1921 * For S4U2Proxy we also got a target service principal,
1922 * which also belongs to our own realm (available on
1923 * our client principal).
1925 code = krb5_parse_name(ctx, target_service, &target_princ);
1927 free_Ticket(&s4u2self_ticket);
1928 krb5_free_principal(ctx, whitelist_principal);
1929 krb5_free_principal(ctx, blacklist_principal);
1930 krb5_cc_destroy(ctx, tmp_cc);
1934 code = krb5_principal_set_realm(ctx, target_princ, self_realm);
1936 free_Ticket(&s4u2self_ticket);
1937 krb5_free_principal(ctx, target_princ);
1938 krb5_free_principal(ctx, whitelist_principal);
1939 krb5_free_principal(ctx, blacklist_principal);
1940 krb5_cc_destroy(ctx, tmp_cc);
1944 code = krb5_get_creds_opt_alloc(ctx, &options);
1946 free_Ticket(&s4u2self_ticket);
1947 krb5_free_principal(ctx, target_princ);
1948 krb5_free_principal(ctx, whitelist_principal);
1949 krb5_free_principal(ctx, blacklist_principal);
1950 krb5_cc_destroy(ctx, tmp_cc);
1954 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
1955 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_CONSTRAINED_DELEGATION);
1957 code = krb5_get_creds_opt_set_ticket(ctx, options, &s4u2self_ticket);
1958 free_Ticket(&s4u2self_ticket);
1960 krb5_get_creds_opt_free(ctx, options);
1961 krb5_free_principal(ctx, target_princ);
1962 krb5_free_principal(ctx, whitelist_principal);
1963 krb5_free_principal(ctx, blacklist_principal);
1964 krb5_cc_destroy(ctx, tmp_cc);
1968 code = krb5_get_creds(ctx, options, tmp_cc,
1969 target_princ, &s4u2proxy_creds);
1970 krb5_get_creds_opt_free(ctx, options);
1971 krb5_free_principal(ctx, target_princ);
1972 krb5_cc_destroy(ctx, tmp_cc);
1974 krb5_free_principal(ctx, whitelist_principal);
1975 krb5_free_principal(ctx, blacklist_principal);
1980 * Now make sure we store the impersonated principal
1981 * and creds instead of the TGT related stuff
1982 * in the krb5_ccache of the caller.
1984 code = krb5_copy_creds_contents(ctx, s4u2proxy_creds,
1986 krb5_free_creds(ctx, s4u2proxy_creds);
1988 krb5_free_principal(ctx, whitelist_principal);
1989 krb5_free_principal(ctx, blacklist_principal);
1994 * It's important to store the principal the KDC
1995 * returned, as otherwise the caller would not find
1996 * the S4U2Self ticket in the krb5_ccache lookup.
1998 store_principal = store_creds.client;
2001 if (blacklist_principal &&
2002 krb5_principal_compare(ctx, store_creds.client, blacklist_principal)) {
2006 code = krb5_unparse_name(ctx, blacklist_principal, &sp);
2010 code = krb5_unparse_name(ctx, impersonate_principal, &ip);
2014 DEBUG(1, ("kerberos_kinit_password_cc: "
2015 "KDC returned self principal[%s] while impersonating [%s]\n",
2016 sp?sp:"<no memory>",
2017 ip?ip:"<no memory>"));
2022 krb5_free_principal(ctx, whitelist_principal);
2023 krb5_free_principal(ctx, blacklist_principal);
2024 krb5_free_cred_contents(ctx, &store_creds);
2025 return KRB5_FWD_BAD_PRINCIPAL;
2027 if (blacklist_principal) {
2028 krb5_free_principal(ctx, blacklist_principal);
2031 if (whitelist_principal &&
2032 !krb5_principal_compare(ctx, store_creds.client, whitelist_principal)) {
2036 code = krb5_unparse_name(ctx, store_creds.client, &sp);
2040 code = krb5_unparse_name(ctx, whitelist_principal, &ep);
2044 DEBUG(1, ("kerberos_kinit_password_cc: "
2045 "KDC returned wrong principal[%s] we expected [%s]\n",
2046 sp?sp:"<no memory>",
2047 ep?ep:"<no memory>"));
2052 krb5_free_principal(ctx, whitelist_principal);
2053 krb5_free_cred_contents(ctx, &store_creds);
2054 return KRB5_FWD_BAD_PRINCIPAL;
2056 if (whitelist_principal) {
2057 krb5_free_principal(ctx, whitelist_principal);
2060 code = krb5_cc_initialize(ctx, store_cc, store_principal);
2062 krb5_free_cred_contents(ctx, &store_creds);
2066 code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
2068 krb5_free_cred_contents(ctx, &store_creds);
2073 *expire_time = (time_t) store_creds.times.endtime;
2077 *kdc_time = (time_t) store_creds.times.starttime;
2080 krb5_free_cred_contents(ctx, &store_creds);
2086 #if !defined(HAVE_KRB5_MAKE_PRINCIPAL) && defined(HAVE_KRB5_BUILD_PRINCIPAL_ALLOC_VA)
2087 krb5_error_code smb_krb5_make_principal(krb5_context context,
2088 krb5_principal *principal,
2089 const char *_realm, ...)
2091 krb5_error_code code;
2100 code = krb5_get_default_realm(context, &realm);
2107 va_start(ap, _realm);
2108 code = krb5_build_principal_alloc_va(context, principal,
2109 strlen(realm), realm,
2114 krb5_free_default_realm(context, realm);
2121 #if !defined(HAVE_KRB5_CC_GET_LIFETIME) && defined(HAVE_KRB5_CC_RETRIEVE_CRED)
2123 * @brief Get the lifetime of the initial ticket in the cache.
2125 * @param[in] context The kerberos context.
2127 * @param[in] id The credential cache to get the ticket lifetime.
2129 * @param[out] t A pointer to a time value to store the lifetime.
2131 * @return 0 on success, a krb5_error_code on error.
2133 krb5_error_code smb_krb5_cc_get_lifetime(krb5_context context,
2137 krb5_cc_cursor cursor;
2138 krb5_error_code kerr;
2144 kerr = krb5_timeofday(context, &now);
2149 kerr = krb5_cc_start_seq_get(context, id, &cursor);
2154 while ((kerr = krb5_cc_next_cred(context, id, &cursor, &cred)) == 0) {
2155 #ifndef HAVE_FLAGS_IN_KRB5_CREDS
2156 if (cred.ticket_flags & TKT_FLG_INITIAL) {
2158 if (cred.flags.b.initial) {
2160 if (now < cred.times.endtime) {
2161 *t = (time_t) (cred.times.endtime - now);
2163 krb5_free_cred_contents(context, &cred);
2166 krb5_free_cred_contents(context, &cred);
2169 krb5_cc_end_seq_get(context, id, &cursor);
2173 #endif /* HAVE_KRB5_CC_GET_LIFETIME */
2175 #if !defined(HAVE_KRB5_FREE_CHECKSUM_CONTENTS) && defined(HAVE_FREE_CHECKSUM)
2176 void smb_krb5_free_checksum_contents(krb5_context ctx, krb5_checksum *cksum)
2178 free_Checksum(cksum);
2182 krb5_error_code smb_krb5_make_pac_checksum(TALLOC_CTX *mem_ctx,
2183 DATA_BLOB *pac_data,
2184 krb5_context context,
2185 const krb5_keyblock *keyblock,
2187 DATA_BLOB *sig_blob)
2189 krb5_error_code ret;
2190 krb5_checksum cksum;
2191 #if defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CREATE_CHECKSUM)
2195 ret = krb5_crypto_init(context,
2200 DEBUG(0,("krb5_crypto_init() failed: %s\n",
2201 smb_get_krb5_error_message(context, ret, mem_ctx)));
2204 ret = krb5_create_checksum(context,
2206 KRB5_KU_OTHER_CKSUM,
2212 DEBUG(2, ("PAC Verification failed: %s\n",
2213 smb_get_krb5_error_message(context, ret, mem_ctx)));
2216 krb5_crypto_destroy(context, crypto);
2222 *sig_type = cksum.cksumtype;
2223 *sig_blob = data_blob_talloc(mem_ctx,
2224 cksum.checksum.data,
2225 cksum.checksum.length);
2226 #elif defined(HAVE_KRB5_C_MAKE_CHECKSUM)
2229 input.data = (char *)pac_data->data;
2230 input.length = pac_data->length;
2232 ret = krb5_c_make_checksum(context,
2235 KRB5_KEYUSAGE_APP_DATA_CKSUM,
2239 DEBUG(2, ("PAC Verification failed: %s\n",
2240 smb_get_krb5_error_message(context, ret, mem_ctx)));
2244 *sig_type = cksum.checksum_type;
2245 *sig_blob = data_blob_talloc(mem_ctx,
2250 #error krb5_create_checksum or krb5_c_make_checksum not available
2251 #endif /* HAVE_KRB5_C_MAKE_CHECKSUM */
2252 smb_krb5_free_checksum_contents(context, &cksum);
2259 * smb_krb5_principal_get_realm
2261 * @brief Get realm of a principal
2263 * @param[in] context The krb5_context
2264 * @param[in] principal The principal
2265 * @return pointer to the realm
2269 char *smb_krb5_principal_get_realm(krb5_context context,
2270 krb5_principal principal)
2272 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2273 return discard_const_p(char, krb5_principal_get_realm(context, principal));
2274 #elif defined(krb5_princ_realm) /* MIT */
2276 realm = krb5_princ_realm(context, principal);
2277 return discard_const_p(char, realm->data);
2283 /************************************************************************
2284 Routine to get the default realm from the kerberos credentials cache.
2285 Caller must free if the return value is not NULL.
2286 ************************************************************************/
2288 static char *smb_krb5_get_default_realm_from_ccache(TALLOC_CTX *mem_ctx)
2291 krb5_context ctx = NULL;
2292 krb5_ccache cc = NULL;
2293 krb5_principal princ = NULL;
2295 initialize_krb5_error_table();
2296 if (krb5_init_context(&ctx)) {
2300 DEBUG(5,("kerberos_get_default_realm_from_ccache: "
2301 "Trying to read krb5 cache: %s\n",
2302 krb5_cc_default_name(ctx)));
2303 if (krb5_cc_default(ctx, &cc)) {
2304 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
2305 "failed to read default cache\n"));
2308 if (krb5_cc_get_principal(ctx, cc, &princ)) {
2309 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
2310 "failed to get default principal\n"));
2314 #if defined(HAVE_KRB5_PRINCIPAL_GET_REALM)
2315 realm = talloc_strdup(mem_ctx, krb5_principal_get_realm(ctx, princ));
2316 #elif defined(HAVE_KRB5_PRINC_REALM)
2318 krb5_data *realm_data = krb5_princ_realm(ctx, princ);
2319 realm = talloc_strndup(mem_ctx, realm_data->data, realm_data->length);
2327 krb5_free_principal(ctx, princ);
2330 krb5_cc_close(ctx, cc);
2332 krb5_free_context(ctx);
2338 /************************************************************************
2339 Routine to get the realm from a given DNS name.
2340 ************************************************************************/
2342 static char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
2343 const char *hostname)
2345 #if defined(HAVE_KRB5_REALM_TYPE)
2347 krb5_realm *realm_list = NULL;
2350 char **realm_list = NULL;
2353 krb5_error_code kerr;
2354 krb5_context ctx = NULL;
2356 initialize_krb5_error_table();
2357 if (krb5_init_context(&ctx)) {
2361 kerr = krb5_get_host_realm(ctx, hostname, &realm_list);
2363 DEBUG(3,("kerberos_get_realm_from_hostname %s: "
2365 hostname ? hostname : "(NULL)",
2366 error_message(kerr) ));
2370 if (realm_list && realm_list[0]) {
2371 realm = talloc_strdup(mem_ctx, realm_list[0]);
2378 krb5_free_host_realm(ctx, realm_list);
2381 krb5_free_context(ctx);
2387 char *kerberos_get_principal_from_service_hostname(TALLOC_CTX *mem_ctx,
2388 const char *service,
2389 const char *remote_name,
2390 const char *default_realm)
2395 host = strchr_m(remote_name, '.');
2398 realm = smb_krb5_get_realm_from_hostname(talloc_tos(),
2401 /* NetBIOS name - use our realm. */
2402 realm = smb_krb5_get_default_realm_from_ccache(talloc_tos());
2405 if (realm == NULL || *realm == '\0') {
2406 realm = talloc_strdup(talloc_tos(), default_realm);
2410 DEBUG(3,("kerberos_get_principal_from_service_hostname: "
2411 "cannot get realm from, "
2412 "desthost %s or default ccache. Using default "
2413 "smb.conf realm %s\n",
2418 principal = talloc_asprintf(mem_ctx,
2420 service, remote_name,
2426 char *smb_get_krb5_error_message(krb5_context context,
2427 krb5_error_code code,
2428 TALLOC_CTX *mem_ctx)
2432 #if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
2433 const char *context_error = krb5_get_error_message(context, code);
2434 if (context_error) {
2435 ret = talloc_asprintf(mem_ctx, "%s: %s",
2436 error_message(code), context_error);
2437 krb5_free_error_message(context, context_error);
2441 ret = talloc_strdup(mem_ctx, error_message(code));
2447 * @brief Return the kerberos library setting for "libdefaults:allow_weak_crypto"
2449 * @param context The krb5_context
2451 * @return krb5_boolean
2453 * Function returns true if weak crypto is allowd, false if not
2456 krb5_boolean smb_krb5_get_allowed_weak_crypto(krb5_context context)
2457 #if defined(HAVE_KRB5_CONFIG_GET_BOOL_DEFAULT)
2459 return krb5_config_get_bool_default(context,
2463 "allow_weak_crypto",
2466 #elif defined(HAVE_PROFILE_H) && defined(HAVE_KRB5_GET_PROFILE)
2468 #include <profile.h>
2469 krb5_error_code ret;
2470 krb5_boolean ret_default = false;
2474 ret = krb5_get_profile(context,
2480 ret = profile_get_boolean(profile,
2482 "allow_weak_crypto",
2483 NULL, /* subsubname */
2484 ret_default, /* def_val */
2485 &ret_profile /* *ret_default */);
2490 profile_release(profile);
2495 #error UNKNOWN_KRB5_CONFIG_ROUTINES
2498 #else /* HAVE_KRB5 */
2499 /* this saves a few linking headaches */
2500 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
2501 const char *principal, time_t time_offset,
2502 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
2503 uint32_t extra_ap_opts,
2504 const char *ccname, time_t *tgs_expire,
2505 const char *impersonate_princ_s)
2507 DEBUG(0,("NO KERBEROS SUPPORT\n"));
2511 #endif /* HAVE_KRB5 */