?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
winbind: Implement forall_children()
[Samba.git] / lib / krb5_wrap / krb5_samba.c
blob7c461e5c2860b6f3bb5d8af4adacd8f4ba319cff
1 /*
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
8
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.
13
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.
18
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/>.
21 */
22
23 #include "includes.h"
24 #include "system/filesys.h"
25 #include "krb5_samba.h"
26 #include "lib/crypto/crypto.h"
27
28 #ifdef HAVE_COM_ERR_H
29 #include <com_err.h>
30 #endif /* HAVE_COM_ERR_H */
31
32 #ifndef KRB5_AUTHDATA_WIN2K_PAC
33 #define KRB5_AUTHDATA_WIN2K_PAC 128
34 #endif
35
36 #ifndef KRB5_AUTHDATA_IF_RELEVANT
37 #define KRB5_AUTHDATA_IF_RELEVANT 1
38 #endif
39
40 #ifdef HAVE_KRB5
41
42 #define GSSAPI_CHECKSUM 0x8003 /* Checksum type value for Kerberos */
43 #define GSSAPI_BNDLENGTH 16 /* Bind Length (rfc-1964 pg.3) */
44 #define GSSAPI_CHECKSUM_SIZE (4+GSSAPI_BNDLENGTH+4) /* Length of bind length,
45 bind field, flags field. */
46 #define GSS_C_DELEG_FLAG 1
47
48 /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
49 but still has the symbol */
50 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
51 krb5_error_code krb5_auth_con_set_req_cksumtype(
52 krb5_context context,
53 krb5_auth_context auth_context,
54 krb5_cksumtype cksumtype);
55 #endif
56
57 #if !defined(SMB_MALLOC)
58 #undef malloc
59 #define SMB_MALLOC(s) malloc((s))
60 #endif
61
62 #ifndef SMB_STRDUP
63 #define SMB_STRDUP(s) strdup(s)
64 #endif
65
66 /**********************************************************
67 * MISSING FUNCTIONS
68 **********************************************************/
69
70 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
71
72 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
73
74 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
75 * to krb5_set_default_tgs_ktypes. See
76 * http://lists.samba.org/archive/samba-technical/2006-July/048271.html
77 *
78 * If the MIT libraries are not exporting internal symbols, we will end up in
79 * this branch, which is correct. Otherwise we will continue to use the
80 * internal symbol
81 */
82 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
83 {
84 return krb5_set_default_tgs_enctypes(ctx, enc);
85 }
86
87 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
88
89 /* Heimdal */
90 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
91 {
92 return krb5_set_default_in_tkt_etypes(ctx, enc);
93 }
94
95 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
96
97 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
98
99
100 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
101 krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
102 krb5_auth_context auth_context,
103 krb5_keyblock *keyblock)
104 {
105 return krb5_auth_con_setkey(context, auth_context, keyblock);
106 }
107 #endif
108
109 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
110 void krb5_free_unparsed_name(krb5_context context, char *val)
111 {
112 SAFE_FREE(val);
113 }
114 #endif
115
116 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
117 const krb5_data *krb5_princ_component(krb5_context context,
118 krb5_principal principal, int i);
119
120 const krb5_data *krb5_princ_component(krb5_context context,
121 krb5_principal principal, int i)
122 {
123 static krb5_data kdata;
124
125 kdata.data = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i));
126 kdata.length = strlen((const char *)kdata.data);
127 return &kdata;
128 }
129 #endif
130
131
132 /**********************************************************
133 * WRAPPING FUNCTIONS
134 **********************************************************/
135
136 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
137 /* HEIMDAL */
138
139 /**
140 * @brief Stores the address of a 'struct sockaddr_storage' a krb5_address
141 *
142 * @param[in] paddr A pointer to a 'struct sockaddr_storage to extract the
143 * address from.
144 *
145 * @param[out] pkaddr A Kerberos address to store tha address in.
146 *
147 * @return True on success, false if an error occurred.
148 */
149 bool smb_krb5_sockaddr_to_kaddr(struct sockaddr_storage *paddr,
150 krb5_address *pkaddr)
151 {
152 memset(pkaddr, '\0', sizeof(krb5_address));
153 #ifdef HAVE_IPV6
154 if (paddr->ss_family == AF_INET6) {
155 pkaddr->addr_type = KRB5_ADDRESS_INET6;
156 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
157 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
158 return true;
159 }
160 #endif
161 if (paddr->ss_family == AF_INET) {
162 pkaddr->addr_type = KRB5_ADDRESS_INET;
163 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
164 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
165 return true;
166 }
167 return false;
168 }
169 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
170 /* MIT */
171
172 /**
173 * @brief Stores the address of a 'struct sockaddr_storage' a krb5_address
174 *
175 * @param[in] paddr A pointer to a 'struct sockaddr_storage to extract the
176 * address from.
177 *
178 * @param[in] pkaddr A Kerberos address to store tha address in.
179 *
180 * @return True on success, false if an error occurred.
181 */
182 bool smb_krb5_sockaddr_to_kaddr(struct sockaddr_storage *paddr,
183 krb5_address *pkaddr)
184 {
185 memset(pkaddr, '\0', sizeof(krb5_address));
186 #ifdef HAVE_IPV6
187 if (paddr->ss_family == AF_INET6) {
188 pkaddr->addrtype = ADDRTYPE_INET6;
189 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
190 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
191 return true;
192 }
193 #endif
194 if (paddr->ss_family == AF_INET) {
195 pkaddr->addrtype = ADDRTYPE_INET;
196 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
197 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
198 return true;
199 }
200 return false;
201 }
202 #else
203 #error UNKNOWN_ADDRTYPE
204 #endif
205
206 krb5_error_code smb_krb5_mk_error(krb5_context context,
207 krb5_error_code error_code,
208 const char *e_text,
209 krb5_data *e_data,
210 const krb5_principal client,
211 const krb5_principal server,
212 krb5_data *enc_err)
213 {
214 krb5_error_code code = EINVAL;
215 #ifdef SAMBA4_USES_HEIMDAL
216 code = krb5_mk_error(context,
217 error_code,
218 e_text,
219 e_data,
220 client,
221 server,
222 NULL, /* client_time */
223 NULL, /* client_usec */
224 enc_err);
225 #else
226 krb5_principal unspec_server = NULL;
227 krb5_error errpkt;
228
229 errpkt.ctime = 0;
230 errpkt.cusec = 0;
231
232 code = krb5_us_timeofday(context,
233 &errpkt.stime,
234 &errpkt.susec);
235 if (code != 0) {
236 return code;
237 }
238
239 errpkt.error = error_code;
240
241 errpkt.text.length = 0;
242 if (e_text != NULL) {
243 errpkt.text.length = strlen(e_text);
244 errpkt.text.data = discard_const_p(char, e_text);
245 }
246
247 errpkt.e_data.magic = KV5M_DATA;
248 errpkt.e_data.length = 0;
249 errpkt.e_data.data = NULL;
250 if (e_data != NULL) {
251 errpkt.e_data = *e_data;
252 }
253
254 errpkt.client = client;
255
256 if (server != NULL) {
257 errpkt.server = server;
258 } else {
259 code = smb_krb5_make_principal(context,
260 &unspec_server,
261 "<unspecified realm>",
262 NULL);
263 if (code != 0) {
264 return code;
265 }
266 errpkt.server = unspec_server;
267 }
268
269 code = krb5_mk_error(context,
270 &errpkt,
271 enc_err);
272 krb5_free_principal(context, unspec_server);
273 #endif
274 return code;
275 }
276
277 /**
278 * @brief Create a keyblock based on input parameters
279 *
280 * @param context The krb5_context
281 * @param host_princ The krb5_principal to use
282 * @param salt The optional salt, if omitted, salt is calculated with
283 * the provided principal.
284 * @param password The krb5_data containing the password
285 * @param enctype The krb5_enctype to use for the keyblock generation
286 * @param key The returned krb5_keyblock, caller needs to free with
287 * krb5_free_keyblock().
288 *
289 * @return krb5_error_code
290 */
291 int smb_krb5_create_key_from_string(krb5_context context,
292 krb5_const_principal host_princ,
293 krb5_data *salt,
294 krb5_data *password,
295 krb5_enctype enctype,
296 krb5_keyblock *key)
297 {
298 int ret = 0;
299
300 if (host_princ == NULL && salt == NULL) {
301 return -1;
302 }
303
304 if ((int)enctype == (int)ENCTYPE_ARCFOUR_HMAC) {
305 TALLOC_CTX *frame = talloc_stackframe();
306 uint8_t *utf16 = NULL;
307 size_t utf16_size = 0;
308 uint8_t nt_hash[16];
309 bool ok;
310
311 ok = convert_string_talloc(frame, CH_UNIX, CH_UTF16LE,
312 password->data, password->length,
313 (void **)&utf16, &utf16_size);
314 if (!ok) {
315 if (errno == 0) {
316 errno = EINVAL;
317 }
318 ret = errno;
319 TALLOC_FREE(frame);
320 return ret;
321 }
322
323 mdfour(nt_hash, utf16, utf16_size);
324 memset(utf16, 0, utf16_size);
325 ret = smb_krb5_keyblock_init_contents(context,
326 ENCTYPE_ARCFOUR_HMAC,
327 nt_hash,
328 sizeof(nt_hash),
329 key);
330 ZERO_STRUCT(nt_hash);
331 if (ret != 0) {
332 TALLOC_FREE(frame);
333 return ret;
334 }
335
336 TALLOC_FREE(frame);
337 return 0;
338 }
339
340 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_C_STRING_TO_KEY)
341 {/* MIT */
342 krb5_data _salt;
343
344 if (salt == NULL) {
345 ret = krb5_principal2salt(context, host_princ, &_salt);
346 if (ret) {
347 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
348 return ret;
349 }
350 } else {
351 _salt = *salt;
352 }
353 ret = krb5_c_string_to_key(context, enctype, password, &_salt, key);
354 if (salt == NULL) {
355 SAFE_FREE(_salt.data);
356 }
357 }
358 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
359 {/* Heimdal */
360 krb5_salt _salt;
361
362 if (salt == NULL) {
363 ret = krb5_get_pw_salt(context, host_princ, &_salt);
364 if (ret) {
365 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
366 return ret;
367 }
368 } else {
369 _salt.saltvalue = *salt;
370 _salt.salttype = KRB5_PW_SALT;
371 }
372
373 ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, _salt, key);
374 if (salt == NULL) {
375 krb5_free_salt(context, _salt);
376 }
377 }
378 #else
379 #error UNKNOWN_CREATE_KEY_FUNCTIONS
380 #endif
381 return ret;
382 }
383
384 /**
385 * @brief Create a salt for a given principal
386 *
387 * @param context The initialized krb5_context
388 * @param host_princ The krb5_principal to create the salt for
389 * @param psalt A pointer to a krb5_data struct
390 *
391 * caller has to free the contents of psalt with smb_krb5_free_data_contents
392 * when function has succeeded
393 *
394 * @return krb5_error_code, returns 0 on success, error code otherwise
395 */
396
397 int smb_krb5_get_pw_salt(krb5_context context,
398 krb5_const_principal host_princ,
399 krb5_data *psalt)
400 #if defined(HAVE_KRB5_GET_PW_SALT)
401 /* Heimdal */
402 {
403 int ret;
404 krb5_salt salt;
405
406 ret = krb5_get_pw_salt(context, host_princ, &salt);
407 if (ret) {
408 return ret;
409 }
410
411 psalt->data = salt.saltvalue.data;
412 psalt->length = salt.saltvalue.length;
413
414 return ret;
415 }
416 #elif defined(HAVE_KRB5_PRINCIPAL2SALT)
417 /* MIT */
418 {
419 return krb5_principal2salt(context, host_princ, psalt);
420 }
421 #else
422 #error UNKNOWN_SALT_FUNCTIONS
423 #endif
424
425 /**
426 * @brief This constructs the salt principal used by active directory
427 *
428 * Most Kerberos encryption types require a salt in order to
429 * calculate the long term private key for user/computer object
430 * based on a password.
431 *
432 * The returned _salt_principal is a string in forms like this:
433 * - host/somehost.example.com@EXAMPLE.COM
434 * - SomeAccount@EXAMPLE.COM
435 * - SomePrincipal@EXAMPLE.COM
436 *
437 * This is not the form that's used as salt, it's just
438 * the human readable form. It needs to be converted by
439 * smb_krb5_salt_principal2data().
440 *
441 * @param[in] realm The realm the user/computer is added too.
442 *
443 * @param[in] sAMAccountName The sAMAccountName attribute of the object.
444 *
445 * @param[in] userPrincipalName The userPrincipalName attribute of the object
446 * or NULL is not available.
447 *
448 * @param[in] is_computer The indication of the object includes
449 * objectClass=computer.
450 *
451 * @param[in] mem_ctx The TALLOC_CTX to allocate _salt_principal.
452 *
453 * @param[out] _salt_principal The resulting principal as string.
454 *
455 * @retval 0 Success; otherwise - Kerberos error codes
456 *
457 * @see smb_krb5_salt_principal2data
458 */
459 int smb_krb5_salt_principal(const char *realm,
460 const char *sAMAccountName,
461 const char *userPrincipalName,
462 bool is_computer,
463 TALLOC_CTX *mem_ctx,
464 char **_salt_principal)
465 {
466 TALLOC_CTX *frame = talloc_stackframe();
467 char *upper_realm = NULL;
468 const char *principal = NULL;
469 int principal_len = 0;
470
471 *_salt_principal = NULL;
472
473 if (sAMAccountName == NULL) {
474 TALLOC_FREE(frame);
475 return EINVAL;
476 }
477
478 if (realm == NULL) {
479 TALLOC_FREE(frame);
480 return EINVAL;
481 }
482
483 upper_realm = strupper_talloc(frame, realm);
484 if (upper_realm == NULL) {
485 TALLOC_FREE(frame);
486 return ENOMEM;
487 }
488
489 /* Many, many thanks to lukeh@padl.com for this
490 * algorithm, described in his Nov 10 2004 mail to
491 * samba-technical@lists.samba.org */
492
493 /*
494 * Determine a salting principal
495 */
496 if (is_computer) {
497 int computer_len = 0;
498 char *tmp = NULL;
499
500 computer_len = strlen(sAMAccountName);
501 if (sAMAccountName[computer_len-1] == '$') {
502 computer_len -= 1;
503 }
504
505 tmp = talloc_asprintf(frame, "host/%*.*s.%s",
506 computer_len, computer_len,
507 sAMAccountName, realm);
508 if (tmp == NULL) {
509 TALLOC_FREE(frame);
510 return ENOMEM;
511 }
512
513 principal = strlower_talloc(frame, tmp);
514 TALLOC_FREE(tmp);
515 if (principal == NULL) {
516 TALLOC_FREE(frame);
517 return ENOMEM;
518 }
519 principal_len = strlen(principal);
520
521 } else if (userPrincipalName != NULL) {
522 char *p;
523
524 principal = userPrincipalName;
525 p = strchr(principal, '@');
526 if (p != NULL) {
527 principal_len = PTR_DIFF(p, principal);
528 } else {
529 principal_len = strlen(principal);
530 }
531 } else {
532 principal = sAMAccountName;
533 principal_len = strlen(principal);
534 }
535
536 *_salt_principal = talloc_asprintf(mem_ctx, "%*.*s@%s",
537 principal_len, principal_len,
538 principal, upper_realm);
539 if (*_salt_principal == NULL) {
540 TALLOC_FREE(frame);
541 return ENOMEM;
542 }
543
544 TALLOC_FREE(frame);
545 return 0;
546 }
547
548 /**
549 * @brief Converts the salt principal string into the salt data blob
550 *
551 * This function takes a salt_principal as string in forms like this:
552 * - host/somehost.example.com@EXAMPLE.COM
553 * - SomeAccount@EXAMPLE.COM
554 * - SomePrincipal@EXAMPLE.COM
555 *
556 * It generates values like:
557 * - EXAMPLE.COMhost/somehost.example.com
558 * - EXAMPLE.COMSomeAccount
559 * - EXAMPLE.COMSomePrincipal
560 *
561 * @param[in] realm The realm the user/computer is added too.
562 *
563 * @param[in] sAMAccountName The sAMAccountName attribute of the object.
564 *
565 * @param[in] userPrincipalName The userPrincipalName attribute of the object
566 * or NULL is not available.
567 *
568 * @param[in] is_computer The indication of the object includes
569 * objectClass=computer.
570 *
571 * @param[in] mem_ctx The TALLOC_CTX to allocate _salt_principal.
572 *
573 * @param[out] _salt_principal The resulting principal as string.
574 *
575 * @retval 0 Success; otherwise - Kerberos error codes
576 *
577 * @see smb_krb5_salt_principal
578 */
579 int smb_krb5_salt_principal2data(krb5_context context,
580 const char *salt_principal,
581 TALLOC_CTX *mem_ctx,
582 char **_salt_data)
583 {
584 krb5_error_code ret;
585 krb5_principal salt_princ = NULL;
586 krb5_data salt;
587
588 *_salt_data = NULL;
589
590 ret = krb5_parse_name(context, salt_principal, &salt_princ);
591 if (ret != 0) {
592 return ret;
593 }
594
595 ret = smb_krb5_get_pw_salt(context, salt_princ, &salt);
596 krb5_free_principal(context, salt_princ);
597 if (ret != 0) {
598 return ret;
599 }
600
601 *_salt_data = talloc_strndup(mem_ctx,
602 (char *)salt.data,
603 salt.length);
604 smb_krb5_free_data_contents(context, &salt);
605 if (*_salt_data == NULL) {
606 return ENOMEM;
607 }
608
609 return 0;
610 }
611
612 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
613 /**
614 * @brief Get a list of encryption types allowed for session keys
615 *
616 * @param[in] context The library context
617 *
618 * @param[in] enctypes An allocated, zero-terminated list of encryption types
619 *
620 * This function returns an allocated list of encryption types allowed for
621 * session keys.
622 *
623 * Use free() to free the enctypes when it is no longer needed.
624 *
625 * @retval 0 Success; otherwise - Kerberos error codes
626 */
627 krb5_error_code smb_krb5_get_allowed_etypes(krb5_context context,
628 krb5_enctype **enctypes)
629 {
630 return krb5_get_permitted_enctypes(context, enctypes);
631 }
632 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
633 krb5_error_code smb_krb5_get_allowed_etypes(krb5_context context,
634 krb5_enctype **enctypes)
635 {
636 #ifdef HAVE_KRB5_PDU_NONE_DECL
637 return krb5_get_default_in_tkt_etypes(context, KRB5_PDU_NONE, enctypes);
638 #else
639 return krb5_get_default_in_tkt_etypes(context, enctypes);
640 #endif
641 }
642 #else
643 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
644 #endif
645
646
647 /**
648 * @brief Convert a string principal name to a Kerberos principal.
649 *
650 * @param[in] context The library context
651 *
652 * @param[in] name The principal as a unix charset string.
653 *
654 * @param[out] principal The newly allocated principal.
655 *
656 * Use krb5_free_principal() to free a principal when it is no longer needed.
657 *
658 * @return 0 on success, a Kerberos error code otherwise.
659 */
660 krb5_error_code smb_krb5_parse_name(krb5_context context,
661 const char *name,
662 krb5_principal *principal)
663 {
664 krb5_error_code ret;
665 char *utf8_name;
666 size_t converted_size;
667 TALLOC_CTX *frame = talloc_stackframe();
668
669 if (!push_utf8_talloc(frame, &utf8_name, name, &converted_size)) {
670 talloc_free(frame);
671 return ENOMEM;
672 }
673
674 ret = krb5_parse_name(context, utf8_name, principal);
675 TALLOC_FREE(frame);
676 return ret;
677 }
678
679 /**
680 * @brief Convert a Kerberos principal structure to a string representation.
681 *
682 * The resulting string representation will be a unix charset name and is
683 * talloc'ed.
684 *
685 * @param[in] mem_ctx The talloc context to allocate memory on.
686 *
687 * @param[in] context The library context.
688 *
689 * @param[in] principal The principal.
690 *
691 * @param[out] unix_name A string representation of the princpial name as with
692 * unix charset.
693 *
694 * Use talloc_free() to free the string representation if it is no longer
695 * needed.
696 *
697 * @return 0 on success, a Kerberos error code otherwise.
698 */
699 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
700 krb5_context context,
701 krb5_const_principal principal,
702 char **unix_name)
703 {
704 krb5_error_code ret;
705 char *utf8_name;
706 size_t converted_size;
707
708 *unix_name = NULL;
709 ret = krb5_unparse_name(context, principal, &utf8_name);
710 if (ret) {
711 return ret;
712 }
713
714 if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
715 krb5_free_unparsed_name(context, utf8_name);
716 return ENOMEM;
717 }
718 krb5_free_unparsed_name(context, utf8_name);
719 return 0;
720 }
721
722 /**
723 * @brief Free the contents of a krb5_data structure and zero the data field.
724 *
725 * @param[in] context The krb5 context
726 *
727 * @param[in] pdata The data structure to free contents of
728 *
729 * This function frees the contents, not the structure itself.
730 */
731 void smb_krb5_free_data_contents(krb5_context context, krb5_data *pdata)
732 {
733 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
734 if (pdata->data) {
735 krb5_free_data_contents(context, pdata);
736 }
737 #elif defined(HAVE_KRB5_DATA_FREE)
738 krb5_data_free(context, pdata);
739 #else
740 SAFE_FREE(pdata->data);
741 #endif
742 }
743
744 /*
745 * @brief copy a buffer into a krb5_data struct
746 *
747 * @param[in] p The krb5_data
748 * @param[in] data The data to copy
749 * @param[in] length The length of the data to copy
750 * @return krb5_error_code
751 *
752 * Caller has to free krb5_data with smb_krb5_free_data_contents().
753 */
754 krb5_error_code smb_krb5_copy_data_contents(krb5_data *p,
755 const void *data,
756 size_t len)
757 {
758 #if defined(HAVE_KRB5_DATA_COPY)
759 return krb5_data_copy(p, data, len);
760 #else
761 if (len) {
762 p->data = malloc(len);
763 if (p->data == NULL) {
764 return ENOMEM;
765 }
766 memmove(p->data, data, len);
767 } else {
768 p->data = NULL;
769 }
770 p->length = len;
771 p->magic = KV5M_DATA;
772 return 0;
773 #endif
774 }
775
776 bool smb_krb5_get_smb_session_key(TALLOC_CTX *mem_ctx,
777 krb5_context context,
778 krb5_auth_context auth_context,
779 DATA_BLOB *session_key,
780 bool remote)
781 {
782 krb5_keyblock *skey = NULL;
783 krb5_error_code err = 0;
784 bool ret = false;
785
786 if (remote) {
787 #ifdef HAVE_KRB5_AUTH_CON_GETRECVSUBKEY
788 err = krb5_auth_con_getrecvsubkey(context,
789 auth_context,
790 &skey);
791 #else /* HAVE_KRB5_AUTH_CON_GETRECVSUBKEY */
792 err = krb5_auth_con_getremotesubkey(context,
793 auth_context, &skey);
794 #endif /* HAVE_KRB5_AUTH_CON_GETRECVSUBKEY */
795 } else {
796 #ifdef HAVE_KRB5_AUTH_CON_GETSENDSUBKEY
797 err = krb5_auth_con_getsendsubkey(context,
798 auth_context,
799 &skey);
800 #else /* HAVE_KRB5_AUTH_CON_GETSENDSUBKEY */
801 err = krb5_auth_con_getlocalsubkey(context,
802 auth_context, &skey);
803 #endif /* HAVE_KRB5_AUTH_CON_GETSENDSUBKEY */
804 }
805
806 if (err || skey == NULL) {
807 DEBUG(10, ("KRB5 error getting session key %d\n", err));
808 goto done;
809 }
810
811 DEBUG(10, ("Got KRB5 session key of length %d\n",
812 (int)KRB5_KEY_LENGTH(skey)));
813
814 *session_key = data_blob_talloc(mem_ctx,
815 KRB5_KEY_DATA(skey),
816 KRB5_KEY_LENGTH(skey));
817 dump_data_pw("KRB5 Session Key:\n",
818 session_key->data,
819 session_key->length);
820
821 ret = true;
822
823 done:
824 if (skey) {
825 krb5_free_keyblock(context, skey);
826 }
827
828 return ret;
829 }
830
831
832 /**
833 * @brief Get talloced string component of a principal
834 *
835 * @param[in] mem_ctx The TALLOC_CTX
836 * @param[in] context The krb5_context
837 * @param[in] principal The principal
838 * @param[in] component The component
839 * @return string component
840 *
841 * Caller must talloc_free if the return value is not NULL.
842 *
843 */
844 char *smb_krb5_principal_get_comp_string(TALLOC_CTX *mem_ctx,
845 krb5_context context,
846 krb5_const_principal principal,
847 unsigned int component)
848 {
849 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING)
850 return talloc_strdup(mem_ctx, krb5_principal_get_comp_string(context, principal, component));
851 #else
852 krb5_data *data;
853
854 if (component >= krb5_princ_size(context, principal)) {
855 return NULL;
856 }
857
858 data = krb5_princ_component(context, principal, component);
859 if (data == NULL) {
860 return NULL;
861 }
862
863 return talloc_strndup(mem_ctx, data->data, data->length);
864 #endif
865 }
866
867 /**
868 * @brief
869 *
870 * @param[in] ccache_string A string pointing to the cache to renew the ticket
871 * (e.g. FILE:/tmp/krb5cc_0) or NULL. If the principal
872 * ccache has not been specified, the default ccache
873 * will be used.
874 *
875 * @param[in] client_string The client principal string (e.g. user@SAMBA.SITE)
876 * or NULL. If the principal string has not been
877 * specified, the principal from the ccache will be
878 * retrieved.
879 *
880 * @param[in] service_string The service ticket string
881 * (e.g. krbtgt/SAMBA.SITE@SAMBA.SITE) or NULL. If
882 * the sevice ticket is specified, it is parsed (
883 * with the realm part ignored) and used as the
884 * server principal of the credential. Otherwise
885 * the ticket-granting service is used.
886 *
887 * @param[in] expire_time A pointer to store the credentials end time or
888 * NULL.
889 *
890 * @return 0 on Succes, a Kerberos error code otherwise.
891 */
892 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,
893 const char *client_string,
894 const char *service_string,
895 time_t *expire_time)
896 {
897 krb5_error_code ret;
898 krb5_context context = NULL;
899 krb5_ccache ccache = NULL;
900 krb5_principal client = NULL;
901 krb5_creds creds, creds_in;
902
903 ZERO_STRUCT(creds);
904 ZERO_STRUCT(creds_in);
905
906 initialize_krb5_error_table();
907 ret = krb5_init_context(&context);
908 if (ret) {
909 goto done;
910 }
911
912 if (!ccache_string) {
913 ccache_string = krb5_cc_default_name(context);
914 }
915
916 if (!ccache_string) {
917 ret = EINVAL;
918 goto done;
919 }
920
921 DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
922
923 /* FIXME: we should not fall back to defaults */
924 ret = krb5_cc_resolve(context, discard_const_p(char, ccache_string), &ccache);
925 if (ret) {
926 goto done;
927 }
928
929 if (client_string) {
930 ret = smb_krb5_parse_name(context, client_string, &client);
931 if (ret) {
932 goto done;
933 }
934 } else {
935 ret = krb5_cc_get_principal(context, ccache, &client);
936 if (ret) {
937 goto done;
938 }
939 }
940
941 ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string));
942 if (ret) {
943 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
944 goto done;
945 }
946
947 /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
948 ret = krb5_cc_initialize(context, ccache, client);
949 if (ret) {
950 goto done;
951 }
952
953 ret = krb5_cc_store_cred(context, ccache, &creds);
954
955 if (expire_time) {
956 *expire_time = (time_t) creds.times.endtime;
957 }
958
959 done:
960 krb5_free_cred_contents(context, &creds_in);
961 krb5_free_cred_contents(context, &creds);
962
963 if (client) {
964 krb5_free_principal(context, client);
965 }
966 if (ccache) {
967 krb5_cc_close(context, ccache);
968 }
969 if (context) {
970 krb5_free_context(context);
971 }
972
973 return ret;
974 }
975
976 /**
977 * @brief Free the data stored in an smb_krb5_addresses structure.
978 *
979 * @param[in] context The library context
980 *
981 * @param[in] addr The address structure to free.
982 *
983 * @return 0 on success, a Kerberos error code otherwise.
984 */
985 krb5_error_code smb_krb5_free_addresses(krb5_context context,
986 smb_krb5_addresses *addr)
987 {
988 krb5_error_code ret = 0;
989 if (addr == NULL) {
990 return ret;
991 }
992 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
993 krb5_free_addresses(context, addr->addrs);
994 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
995 ret = krb5_free_addresses(context, addr->addrs);
996 SAFE_FREE(addr->addrs);
997 #endif
998 SAFE_FREE(addr);
999 addr = NULL;
1000 return ret;
1001 }
1002
1003 #define MAX_NETBIOSNAME_LEN 16
1004
1005 /**
1006 * @brief Add a netbios name to the array of addresses
1007 *
1008 * @param[in] kerb_addr A pointer to the smb_krb5_addresses to add the
1009 * netbios name to.
1010 *
1011 * @param[in] netbios_name The netbios name to add.
1012 *
1013 * @return 0 on success, a Kerberos error code otherwise.
1014 */
1015 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr,
1016 const char *netbios_name)
1017 {
1018 krb5_error_code ret = 0;
1019 char buf[MAX_NETBIOSNAME_LEN];
1020 int 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;
1025 #endif
1026
1027 *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1028 if (*kerb_addr == NULL) {
1029 return ENOMEM;
1030 }
1031
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);
1039 }
1040 buf[MAX_NETBIOSNAME_LEN - 1] = 0x20;
1041
1042 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1043 {
1044 int num_addr = 2;
1045
1046 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1047 if (addrs == NULL) {
1048 SAFE_FREE(*kerb_addr);
1049 return ENOMEM;
1050 }
1051
1052 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1053
1054 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1055 if (addrs[0] == NULL) {
1056 SAFE_FREE(addrs);
1057 SAFE_FREE(*kerb_addr);
1058 return ENOMEM;
1059 }
1060
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]);
1067 SAFE_FREE(addrs);
1068 SAFE_FREE(*kerb_addr);
1069 return ENOMEM;
1070 }
1071
1072 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1073
1074 addrs[1] = NULL;
1075 }
1076 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1077 {
1078 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1079 if (addrs == NULL) {
1080 SAFE_FREE(*kerb_addr);
1081 return ENOMEM;
1082 }
1083
1084 memset(addrs, 0, sizeof(krb5_addresses));
1085
1086 addrs->len = 1;
1087 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1088 if (addrs->val == NULL) {
1089 SAFE_FREE(addrs);
1090 SAFE_FREE(kerb_addr);
1091 return ENOMEM;
1092 }
1093
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);
1099 SAFE_FREE(addrs);
1100 SAFE_FREE(*kerb_addr);
1101 return ENOMEM;
1102 }
1103
1104 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1105 }
1106 #else
1107 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1108 #endif
1109 (*kerb_addr)->addrs = addrs;
1110
1111 return ret;
1112 }
1113
1114 /**
1115 * @brief Get the enctype from a key table entry
1116 *
1117 * @param[in] kt_entry Key table entry to get the enctype from.
1118 *
1119 * @return The enctype from the entry.
1120 */
1121 krb5_enctype smb_krb5_kt_get_enctype_from_entry(krb5_keytab_entry *kt_entry)
1122 {
1123 return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1124 }
1125
1126 /**
1127 * @brief Free the contents of a key table entry.
1128 *
1129 * @param[in] context The library context.
1130 *
1131 * @param[in] kt_entry The key table entry to free the contents of.
1132 *
1133 * @return 0 on success, a Kerberos error code otherwise.
1134 *
1135 * The pointer itself is not freed.
1136 */
1137 krb5_error_code smb_krb5_kt_free_entry(krb5_context context,
1138 krb5_keytab_entry *kt_entry)
1139 {
1140 /* Try krb5_free_keytab_entry_contents first, since
1141 * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
1142 * krb5_kt_free_entry but only has a prototype for the first, while the
1143 * second is considered private.
1144 */
1145 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
1146 return krb5_free_keytab_entry_contents(context, kt_entry);
1147 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
1148 return krb5_kt_free_entry(context, kt_entry);
1149 #else
1150 #error UNKNOWN_KT_FREE_FUNCTION
1151 #endif
1152 }
1153
1154
1155 /**
1156 * @brief Convert an encryption type to a string.
1157 *
1158 * @param[in] context The library context.
1159 *
1160 * @param[in] enctype The encryption type.
1161 *
1162 * @param[in] etype_s A pointer to store the allocated encryption type as a
1163 * string.
1164 *
1165 * @return 0 on success, a Kerberos error code otherwise.
1166 *
1167 * The caller needs to free the allocated string etype_s.
1168 */
1169 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1170 krb5_enctype enctype,
1171 char **etype_s)
1172 {
1173 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1174 return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1175 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1176 char buf[256];
1177 krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1178 if (ret) {
1179 return ret;
1180 }
1181 *etype_s = SMB_STRDUP(buf);
1182 if (!*etype_s) {
1183 return ENOMEM;
1184 }
1185 return ret;
1186 #else
1187 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1188 #endif
1189 }
1190
1191 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1192 #ifndef MAX_KEYTAB_NAME_LEN
1193 #define MAX_KEYTAB_NAME_LEN 1100
1194 #endif
1195
1196 /**
1197 * @brief Open a key table readonly or with readwrite access.
1198 *
1199 * Allows to use a different keytab than the default one using a relative
1200 * path to the keytab.
1201 *
1202 * @param[in] context The library context
1203 *
1204 * @param[in] keytab_name_req The path to the key table.
1205 *
1206 * @param[in] write_access Open with readwrite access.
1207 *
1208 * @param[in] keytab A pointer o the opended key table.
1209 *
1210 * The keytab pointer should be freed using krb5_kt_close().
1211 *
1212 * @return 0 on success, a Kerberos error code otherwise.
1213 */
1214 krb5_error_code smb_krb5_kt_open_relative(krb5_context context,
1215 const char *keytab_name_req,
1216 bool write_access,
1217 krb5_keytab *keytab)
1218 {
1219 krb5_error_code ret = 0;
1220 TALLOC_CTX *mem_ctx;
1221 char keytab_string[MAX_KEYTAB_NAME_LEN];
1222 char *kt_str = NULL;
1223 bool found_valid_name = false;
1224 const char *pragma = "FILE";
1225 const char *tmp = NULL;
1226
1227 if (!write_access && !keytab_name_req) {
1228 /* caller just wants to read the default keytab readonly, so be it */
1229 return krb5_kt_default(context, keytab);
1230 }
1231
1232 mem_ctx = talloc_init("smb_krb5_open_keytab");
1233 if (!mem_ctx) {
1234 return ENOMEM;
1235 }
1236
1237 #ifdef HAVE_WRFILE_KEYTAB
1238 if (write_access) {
1239 pragma = "WRFILE";
1240 }
1241 #endif
1242
1243 if (keytab_name_req) {
1244
1245 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1246 ret = KRB5_CONFIG_NOTENUFSPACE;
1247 goto out;
1248 }
1249
1250 if ((strncmp(keytab_name_req, "WRFILE:", 7) == 0) ||
1251 (strncmp(keytab_name_req, "FILE:", 5) == 0)) {
1252 tmp = keytab_name_req;
1253 goto resolve;
1254 }
1255
1256 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1257 if (!tmp) {
1258 ret = ENOMEM;
1259 goto out;
1260 }
1261
1262 goto resolve;
1263 }
1264
1265 /* we need to handle more complex keytab_strings, like:
1266 * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1267
1268 ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1269 if (ret) {
1270 goto out;
1271 }
1272
1273 DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1274
1275 tmp = talloc_strdup(mem_ctx, keytab_string);
1276 if (!tmp) {
1277 ret = ENOMEM;
1278 goto out;
1279 }
1280
1281 if (strncmp(tmp, "ANY:", 4) == 0) {
1282 tmp += 4;
1283 }
1284
1285 memset(&keytab_string, '\0', sizeof(keytab_string));
1286
1287 while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1288 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1289 found_valid_name = true;
1290 tmp = kt_str;
1291 tmp += 7;
1292 }
1293
1294 if (strncmp(kt_str, "FILE:", 5) == 0) {
1295 found_valid_name = true;
1296 tmp = kt_str;
1297 tmp += 5;
1298 }
1299
1300 if (tmp[0] == '/') {
1301 /* Treat as a FILE: keytab definition. */
1302 found_valid_name = true;
1303 }
1304
1305 if (found_valid_name) {
1306 if (tmp[0] != '/') {
1307 ret = KRB5_KT_BADNAME;
1308 goto out;
1309 }
1310
1311 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1312 if (!tmp) {
1313 ret = ENOMEM;
1314 goto out;
1315 }
1316 break;
1317 }
1318 }
1319
1320 if (!found_valid_name) {
1321 ret = KRB5_KT_UNKNOWN_TYPE;
1322 goto out;
1323 }
1324
1325 resolve:
1326 DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1327 ret = krb5_kt_resolve(context, tmp, keytab);
1328
1329 out:
1330 TALLOC_FREE(mem_ctx);
1331 return ret;
1332 }
1333
1334 /**
1335 * @brief Open a key table readonly or with readwrite access.
1336 *
1337 * Allows to use a different keytab than the default one. The path needs to be
1338 * an absolute path or an error will be returned.
1339 *
1340 * @param[in] context The library context
1341 *
1342 * @param[in] keytab_name_req The path to the key table.
1343 *
1344 * @param[in] write_access Open with readwrite access.
1345 *
1346 * @param[in] keytab A pointer o the opended key table.
1347 *
1348 * The keytab pointer should be freed using krb5_kt_close().
1349 *
1350 * @return 0 on success, a Kerberos error code otherwise.
1351 */
1352 krb5_error_code smb_krb5_kt_open(krb5_context context,
1353 const char *keytab_name_req,
1354 bool write_access,
1355 krb5_keytab *keytab)
1356 {
1357 int cmp;
1358
1359 if (keytab_name_req == NULL) {
1360 return KRB5_KT_BADNAME;
1361 }
1362
1363 if (keytab_name_req[0] == '/') {
1364 goto open_keytab;
1365 }
1366
1367 cmp = strncmp(keytab_name_req, "FILE:/", 6);
1368 if (cmp == 0) {
1369 goto open_keytab;
1370 }
1371
1372 cmp = strncmp(keytab_name_req, "WRFILE:/", 8);
1373 if (cmp == 0) {
1374 goto open_keytab;
1375 }
1376
1377 DBG_WARNING("ERROR: Invalid keytab name: %s\n", keytab_name_req);
1378
1379 return KRB5_KT_BADNAME;
1380
1381 open_keytab:
1382 return smb_krb5_kt_open_relative(context,
1383 keytab_name_req,
1384 write_access,
1385 keytab);
1386 }
1387
1388 /**
1389 * @brief Get a key table name.
1390 *
1391 * @param[in] mem_ctx The talloc context to use for allocation.
1392 *
1393 * @param[in] context The library context.
1394 *
1395 * @param[in] keytab The key table to get the name from.
1396 *
1397 * @param[in] keytab_name A talloc'ed string of the key table name.
1398 *
1399 * The talloc'ed name string needs to be freed with talloc_free().
1400 *
1401 * @return 0 on success, a Kerberos error code otherwise.
1402 */
1403 krb5_error_code smb_krb5_kt_get_name(TALLOC_CTX *mem_ctx,
1404 krb5_context context,
1405 krb5_keytab keytab,
1406 const char **keytab_name)
1407 {
1408 char keytab_string[MAX_KEYTAB_NAME_LEN];
1409 krb5_error_code ret = 0;
1410
1411 ret = krb5_kt_get_name(context, keytab,
1412 keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1413 if (ret) {
1414 return ret;
1415 }
1416
1417 *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1418 if (!*keytab_name) {
1419 return ENOMEM;
1420 }
1421
1422 return ret;
1423 }
1424
1425 /**
1426 * @brief Seek and delete old entries in a keytab based on the passed
1427 * principal.
1428 *
1429 * @param[in] context The KRB5 context to use.
1430 *
1431 * @param[in] keytab The keytab to operate on.
1432 *
1433 * @param[in] kvno The kvnco to use.
1434 *
1435 * @param[in] princ_s The principal as a string to search for.
1436 *
1437 * @param[in] princ The principal as a krb5_principal to search for.
1438 *
1439 * @param[in] flush Weather to flush the complete keytab.
1440 *
1441 * @param[in] keep_old_entries Keep the entry with the previous kvno.
1442 *
1443 * @retval 0 on Sucess
1444 *
1445 * @return An appropriate KRB5 error code.
1446 */
1447 krb5_error_code smb_krb5_kt_seek_and_delete_old_entries(krb5_context context,
1448 krb5_keytab keytab,
1449 krb5_kvno kvno,
1450 krb5_enctype enctype,
1451 const char *princ_s,
1452 krb5_principal princ,
1453 bool flush,
1454 bool keep_old_entries)
1455 {
1456 krb5_error_code ret;
1457 krb5_kt_cursor cursor;
1458 krb5_keytab_entry kt_entry;
1459 char *ktprinc = NULL;
1460 krb5_kvno old_kvno = kvno - 1;
1461 TALLOC_CTX *tmp_ctx;
1462
1463 ZERO_STRUCT(cursor);
1464 ZERO_STRUCT(kt_entry);
1465
1466 ret = krb5_kt_start_seq_get(context, keytab, &cursor);
1467 if (ret == KRB5_KT_END || ret == ENOENT ) {
1468 /* no entries */
1469 return 0;
1470 }
1471
1472 tmp_ctx = talloc_new(NULL);
1473 if (tmp_ctx == NULL) {
1474 return ENOMEM;
1475 }
1476
1477 DEBUG(3, (__location__ ": Will try to delete old keytab entries\n"));
1478 while (!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) {
1479 bool name_ok = false;
1480 krb5_enctype kt_entry_enctype =
1481 smb_krb5_kt_get_enctype_from_entry(&kt_entry);
1482
1483 if (!flush && (princ_s != NULL)) {
1484 ret = smb_krb5_unparse_name(tmp_ctx, context,
1485 kt_entry.principal,
1486 &ktprinc);
1487 if (ret) {
1488 DEBUG(1, (__location__
1489 ": smb_krb5_unparse_name failed "
1490 "(%s)\n", error_message(ret)));
1491 goto out;
1492 }
1493
1494 #ifdef HAVE_KRB5_KT_COMPARE
1495 name_ok = krb5_kt_compare(context, &kt_entry,
1496 princ, 0, 0);
1497 #else
1498 name_ok = (strcmp(ktprinc, princ_s) == 0);
1499 #endif
1500
1501 if (!name_ok) {
1502 DEBUG(10, (__location__ ": ignoring keytab "
1503 "entry principal %s, kvno = %d\n",
1504 ktprinc, kt_entry.vno));
1505
1506 /* Not a match,
1507 * just free this entry and continue. */
1508 ret = smb_krb5_kt_free_entry(context,
1509 &kt_entry);
1510 ZERO_STRUCT(kt_entry);
1511 if (ret) {
1512 DEBUG(1, (__location__
1513 ": smb_krb5_kt_free_entry "
1514 "failed (%s)\n",
1515 error_message(ret)));
1516 goto out;
1517 }
1518
1519 TALLOC_FREE(ktprinc);
1520 continue;
1521 }
1522
1523 TALLOC_FREE(ktprinc);
1524 }
1525
1526 /*------------------------------------------------------------
1527 * Save the entries with kvno - 1. This is what microsoft does
1528 * to allow people with existing sessions that have kvno - 1
1529 * to still work. Otherwise, when the password for the machine
1530 * changes, all kerberizied sessions will 'break' until either
1531 * the client reboots or the client's session key expires and
1532 * they get a new session ticket with the new kvno.
1533 * Some keytab files only store the kvno in 8bits, limit
1534 * the compare accordingly.
1535 */
1536
1537 if (!flush && ((kt_entry.vno & 0xff) == (old_kvno & 0xff))) {
1538 DEBUG(5, (__location__ ": Saving previous (kvno %d) "
1539 "entry for principal: %s.\n",
1540 old_kvno, princ_s));
1541 continue;
1542 }
1543
1544 if (keep_old_entries) {
1545 DEBUG(5, (__location__ ": Saving old (kvno %d) "
1546 "entry for principal: %s.\n",
1547 kvno, princ_s));
1548 continue;
1549 }
1550
1551 if (!flush &&
1552 (kt_entry.vno == kvno) &&
1553 (kt_entry_enctype != enctype))
1554 {
1555 DEBUG(5, (__location__ ": Saving entry with kvno [%d] "
1556 "enctype [%d] for principal: %s.\n",
1557 kvno, kt_entry_enctype, princ_s));
1558 continue;
1559 }
1560
1561 DEBUG(5, (__location__ ": Found old entry for principal: %s "
1562 "(kvno %d) - trying to remove it.\n",
1563 princ_s, kt_entry.vno));
1564
1565 ret = krb5_kt_end_seq_get(context, keytab, &cursor);
1566 ZERO_STRUCT(cursor);
1567 if (ret) {
1568 DEBUG(1, (__location__ ": krb5_kt_end_seq_get() "
1569 "failed (%s)\n", error_message(ret)));
1570 goto out;
1571 }
1572 ret = krb5_kt_remove_entry(context, keytab, &kt_entry);
1573 if (ret) {
1574 DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
1575 "failed (%s)\n", error_message(ret)));
1576 goto out;
1577 }
1578
1579 DEBUG(5, (__location__ ": removed old entry for principal: "
1580 "%s (kvno %d).\n", princ_s, kt_entry.vno));
1581
1582 ret = krb5_kt_start_seq_get(context, keytab, &cursor);
1583 if (ret) {
1584 DEBUG(1, (__location__ ": krb5_kt_start_seq() failed "
1585 "(%s)\n", error_message(ret)));
1586 goto out;
1587 }
1588 ret = smb_krb5_kt_free_entry(context, &kt_entry);
1589 ZERO_STRUCT(kt_entry);
1590 if (ret) {
1591 DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
1592 "failed (%s)\n", error_message(ret)));
1593 goto out;
1594 }
1595 }
1596
1597 out:
1598 talloc_free(tmp_ctx);
1599 if (!all_zero((uint8_t *)&kt_entry, sizeof(kt_entry))) {
1600 smb_krb5_kt_free_entry(context, &kt_entry);
1601 }
1602 if (!all_zero((uint8_t *)&cursor, sizeof(cursor))) {
1603 krb5_kt_end_seq_get(context, keytab, &cursor);
1604 }
1605 return ret;
1606 }
1607
1608 /**
1609 * @brief Add a keytab entry for the given principal
1610 *
1611 * @param[in] context The krb5 context to use.
1612 *
1613 * @param[in] keytab The keytab to add the entry to.
1614 *
1615 * @param[in] kvno The kvno to use.
1616 *
1617 * @param[in] princ_s The principal as a string.
1618 *
1619 * @param[in] salt_principal The salt principal to salt the password with.
1620 * Only needed for keys which support salting.
1621 * If no salt is used set no_salt to false and
1622 * pass NULL here.
1623 *
1624 * @param[in] enctype The encryption type of the keytab entry.
1625 *
1626 * @param[in] password The password of the keytab entry.
1627 *
1628 * @param[in] no_salt If the password should not be salted. Normally
1629 * this is only set to false for encryption types
1630 * which do not support salting like RC4.
1631 *
1632 * @param[in] keep_old_entries Wether to keep or delte old keytab entries.
1633 *
1634 * @retval 0 on Success
1635 *
1636 * @return A corresponding KRB5 error code.
1637 *
1638 * @see smb_krb5_kt_open()
1639 */
1640 krb5_error_code smb_krb5_kt_add_entry(krb5_context context,
1641 krb5_keytab keytab,
1642 krb5_kvno kvno,
1643 const char *princ_s,
1644 const char *salt_principal,
1645 krb5_enctype enctype,
1646 krb5_data *password,
1647 bool no_salt,
1648 bool keep_old_entries)
1649 {
1650 krb5_error_code ret;
1651 krb5_keytab_entry kt_entry;
1652 krb5_principal princ = NULL;
1653 krb5_keyblock *keyp;
1654
1655 ZERO_STRUCT(kt_entry);
1656
1657 ret = smb_krb5_parse_name(context, princ_s, &princ);
1658 if (ret) {
1659 DEBUG(1, (__location__ ": smb_krb5_parse_name(%s) "
1660 "failed (%s)\n", princ_s, error_message(ret)));
1661 goto out;
1662 }
1663
1664 /* Seek and delete old keytab entries */
1665 ret = smb_krb5_kt_seek_and_delete_old_entries(context,
1666 keytab,
1667 kvno,
1668 enctype,
1669 princ_s,
1670 princ,
1671 false,
1672 keep_old_entries);
1673 if (ret) {
1674 goto out;
1675 }
1676
1677 /* If we get here, we have deleted all the old entries with kvno's
1678 * not equal to the current kvno-1. */
1679
1680 keyp = KRB5_KT_KEY(&kt_entry);
1681
1682 if (no_salt) {
1683 KRB5_KEY_DATA(keyp) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
1684 if (KRB5_KEY_DATA(keyp) == NULL) {
1685 ret = ENOMEM;
1686 goto out;
1687 }
1688 memcpy(KRB5_KEY_DATA(keyp), password->data, password->length);
1689 KRB5_KEY_LENGTH(keyp) = password->length;
1690 KRB5_KEY_TYPE(keyp) = enctype;
1691 } else {
1692 krb5_principal salt_princ = NULL;
1693
1694 /* Now add keytab entries for all encryption types */
1695 ret = smb_krb5_parse_name(context, salt_principal, &salt_princ);
1696 if (ret) {
1697 DBG_WARNING("krb5_parse_name(%s) failed (%s)\n",
1698 salt_principal, error_message(ret));
1699 goto out;
1700 }
1701
1702 ret = smb_krb5_create_key_from_string(context,
1703 salt_princ,
1704 NULL,
1705 password,
1706 enctype,
1707 keyp);
1708 krb5_free_principal(context, salt_princ);
1709 if (ret != 0) {
1710 goto out;
1711 }
1712 }
1713
1714 kt_entry.principal = princ;
1715 kt_entry.vno = kvno;
1716
1717 DEBUG(3, (__location__ ": adding keytab entry for (%s) with "
1718 "encryption type (%d) and version (%d)\n",
1719 princ_s, enctype, kt_entry.vno));
1720 ret = krb5_kt_add_entry(context, keytab, &kt_entry);
1721 krb5_free_keyblock_contents(context, keyp);
1722 ZERO_STRUCT(kt_entry);
1723 if (ret) {
1724 DEBUG(1, (__location__ ": adding entry to keytab "
1725 "failed (%s)\n", error_message(ret)));
1726 goto out;
1727 }
1728
1729 out:
1730 if (princ) {
1731 krb5_free_principal(context, princ);
1732 }
1733
1734 return ret;
1735 }
1736
1737 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1738 defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1739 defined(HAVE_KRB5_GET_CREDS)
1740 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1741 krb5_ccache ccache,
1742 krb5_principal me,
1743 krb5_principal server,
1744 krb5_principal impersonate_princ,
1745 krb5_creds **out_creds)
1746 {
1747 krb5_error_code ret;
1748 krb5_get_creds_opt opt;
1749
1750 ret = krb5_get_creds_opt_alloc(context, &opt);
1751 if (ret) {
1752 goto done;
1753 }
1754 krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1755
1756 if (impersonate_princ) {
1757 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1758 impersonate_princ);
1759 if (ret) {
1760 goto done;
1761 }
1762 }
1763
1764 ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1765 if (ret) {
1766 goto done;
1767 }
1768
1769 done:
1770 if (opt) {
1771 krb5_get_creds_opt_free(context, opt);
1772 }
1773 return ret;
1774 }
1775 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1776
1777 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1778
1779 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1780 krb5_error_code KRB5_CALLCONV
1781 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1782 krb5_ccache ccache, krb5_creds *in_creds,
1783 krb5_data *subject_cert,
1784 krb5_creds **out_creds);
1785 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1786
1787 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1788 krb5_ccache ccache,
1789 krb5_principal me,
1790 krb5_principal server,
1791 krb5_principal impersonate_princ,
1792 krb5_creds **out_creds)
1793 {
1794 krb5_error_code ret;
1795 krb5_creds in_creds;
1796
1797 ZERO_STRUCT(in_creds);
1798
1799 if (impersonate_princ) {
1800
1801 in_creds.server = me;
1802 in_creds.client = impersonate_princ;
1803
1804 ret = krb5_get_credentials_for_user(context,
1805 0, /* krb5_flags options */
1806 ccache,
1807 &in_creds,
1808 NULL, /* krb5_data *subject_cert */
1809 out_creds);
1810 } else {
1811 in_creds.client = me;
1812 in_creds.server = server;
1813
1814 ret = krb5_get_credentials(context, 0, ccache,
1815 &in_creds, out_creds);
1816 }
1817
1818 return ret;
1819 }
1820 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1821
1822 /*
1823 * smb_krb5_get_credentials
1824 *
1825 * @brief Get krb5 credentials for a server
1826 *
1827 * @param[in] context An initialized krb5_context
1828 * @param[in] ccache An initialized krb5_ccache
1829 * @param[in] me The krb5_principal of the caller
1830 * @param[in] server The krb5_principal of the requested service
1831 * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1832 * @param[out] out_creds The returned krb5_creds structure
1833 * @return krb5_error_code
1834 *
1835 */
1836 krb5_error_code smb_krb5_get_credentials(krb5_context context,
1837 krb5_ccache ccache,
1838 krb5_principal me,
1839 krb5_principal server,
1840 krb5_principal impersonate_princ,
1841 krb5_creds **out_creds)
1842 {
1843 krb5_error_code ret;
1844 krb5_creds *creds = NULL;
1845
1846 if (out_creds != NULL) {
1847 *out_creds = NULL;
1848 }
1849
1850 if (impersonate_princ) {
1851 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
1852 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
1853 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
1854 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
1855 #else
1856 ret = ENOTSUP;
1857 #endif
1858 } else {
1859 krb5_creds in_creds;
1860
1861 ZERO_STRUCT(in_creds);
1862
1863 in_creds.client = me;
1864 in_creds.server = server;
1865
1866 ret = krb5_get_credentials(context, 0, ccache,
1867 &in_creds, &creds);
1868 }
1869 if (ret) {
1870 goto done;
1871 }
1872
1873 if (out_creds) {
1874 *out_creds = creds;
1875 }
1876
1877 done:
1878 if (creds && ret) {
1879 krb5_free_creds(context, creds);
1880 }
1881
1882 return ret;
1883 }
1884
1885 /**
1886 * @brief Initialize a krb5_keyblock with the given data.
1887 *
1888 * Initialized a new keyblock, allocates the contents fo the key and
1889 * copies the data into the keyblock.
1890 *
1891 * @param[in] context The library context
1892 *
1893 * @param[in] enctype The encryption type.
1894 *
1895 * @param[in] data The date to initialize the keyblock with.
1896 *
1897 * @param[in] length The length of the keyblock.
1898 *
1899 * @param[in] key Newly allocated keyblock structure.
1900 *
1901 * The key date must be freed using krb5_free_keyblock_contents() when it is
1902 * no longer needed.
1903 *
1904 * @return 0 on success, a Kerberos error code otherwise.
1905 */
1906 krb5_error_code smb_krb5_keyblock_init_contents(krb5_context context,
1907 krb5_enctype enctype,
1908 const void *data,
1909 size_t length,
1910 krb5_keyblock *key)
1911 {
1912 #if defined(HAVE_KRB5_KEYBLOCK_INIT)
1913 return krb5_keyblock_init(context, enctype, data, length, key);
1914 #else
1915 memset(key, 0, sizeof(krb5_keyblock));
1916 KRB5_KEY_DATA(key) = SMB_MALLOC(length);
1917 if (NULL == KRB5_KEY_DATA(key)) {
1918 return ENOMEM;
1919 }
1920 memcpy(KRB5_KEY_DATA(key), data, length);
1921 KRB5_KEY_LENGTH(key) = length;
1922 KRB5_KEY_TYPE(key) = enctype;
1923 return 0;
1924 #endif
1925 }
1926
1927 /**
1928 * @brief Simulate a kinit by putting the tgt in the given credential cache.
1929 *
1930 * This function uses a keyblock rather than needingthe original password.
1931 *
1932 * @param[in] ctx The library context
1933 *
1934 * @param[in] cc The credential cache to put the tgt in.
1935 *
1936 * @param[in] principal The client princial
1937 *
1938 * @param[in] keyblock The keyblock to use.
1939 *
1940 * @param[in] target_service The service name of the initial credentials (or NULL).
1941 *
1942 * @param[in] krb_options Initial credential options.
1943 *
1944 * @param[in] expire_time A pointer to store the experation time of the
1945 * credentials (or NULL).
1946 *
1947 * @param[in] kdc_time A pointer to store the time when the ticket becomes
1948 * valid (or NULL).
1949 *
1950 * @return 0 on success, a Kerberos error code otherwise.
1951 */
1952 krb5_error_code smb_krb5_kinit_keyblock_ccache(krb5_context ctx,
1953 krb5_ccache cc,
1954 krb5_principal principal,
1955 krb5_keyblock *keyblock,
1956 const char *target_service,
1957 krb5_get_init_creds_opt *krb_options,
1958 time_t *expire_time,
1959 time_t *kdc_time)
1960 {
1961 krb5_error_code code = 0;
1962 krb5_creds my_creds;
1963
1964 #if defined(HAVE_KRB5_GET_INIT_CREDS_KEYBLOCK)
1965 code = krb5_get_init_creds_keyblock(ctx, &my_creds, principal,
1966 keyblock, 0, target_service,
1967 krb_options);
1968 #elif defined(HAVE_KRB5_GET_INIT_CREDS_KEYTAB)
1969 {
1970 #define SMB_CREDS_KEYTAB "MEMORY:tmp_smb_creds_XXXXXX"
1971 char tmp_name[sizeof(SMB_CREDS_KEYTAB)];
1972 krb5_keytab_entry entry;
1973 krb5_keytab keytab;
1974 mode_t mask;
1975
1976 memset(&entry, 0, sizeof(entry));
1977 entry.principal = principal;
1978 *(KRB5_KT_KEY(&entry)) = *keyblock;
1979
1980 memcpy(tmp_name, SMB_CREDS_KEYTAB, sizeof(SMB_CREDS_KEYTAB));
1981 mask = umask(S_IRWXO | S_IRWXG);
1982 mktemp(tmp_name);
1983 umask(mask);
1984 if (tmp_name[0] == 0) {
1985 return KRB5_KT_BADNAME;
1986 }
1987 code = krb5_kt_resolve(ctx, tmp_name, &keytab);
1988 if (code) {
1989 return code;
1990 }
1991
1992 code = krb5_kt_add_entry(ctx, keytab, &entry);
1993 if (code) {
1994 (void)krb5_kt_close(ctx, keytab);
1995 goto done;
1996 }
1997
1998 code = krb5_get_init_creds_keytab(ctx, &my_creds, principal,
1999 keytab, 0, target_service,
2000 krb_options);
2001 (void)krb5_kt_close(ctx, keytab);
2002 }
2003 #else
2004 #error krb5_get_init_creds_keyblock not available!
2005 #endif
2006 if (code) {
2007 return code;
2008 }
2009
2010 #ifndef SAMBA4_USES_HEIMDAL /* MIT */
2011 /*
2012 * We need to store the principal as returned from the KDC to the
2013 * credentials cache. If we don't do that the KRB5 library is not
2014 * able to find the tickets it is looking for
2015 */
2016 principal = my_creds.client;
2017 #endif
2018 code = krb5_cc_initialize(ctx, cc, principal);
2019 if (code) {
2020 goto done;
2021 }
2022
2023 code = krb5_cc_store_cred(ctx, cc, &my_creds);
2024 if (code) {
2025 goto done;
2026 }
2027
2028 if (expire_time) {
2029 *expire_time = (time_t) my_creds.times.endtime;
2030 }
2031
2032 if (kdc_time) {
2033 *kdc_time = (time_t) my_creds.times.starttime;
2034 }
2035
2036 code = 0;
2037 done:
2038 krb5_free_cred_contents(ctx, &my_creds);
2039 return code;
2040 }
2041
2042 /**
2043 * @brief Simulate a kinit by putting the tgt in the given credential cache.
2044 *
2045 * @param[in] ctx The library context
2046 *
2047 * @param[in] cc The credential cache to put the tgt in.
2048 *
2049 * @param[in] principal The client princial
2050 *
2051 * @param[in] password The password (or NULL).
2052 *
2053 * @param[in] target_service The service name of the initial credentials (or NULL).
2054 *
2055 * @param[in] krb_options Initial credential options.
2056 *
2057 * @param[in] expire_time A pointer to store the experation time of the
2058 * credentials (or NULL).
2059 *
2060 * @param[in] kdc_time A pointer to store the time when the ticket becomes
2061 * valid (or NULL).
2062 *
2063 * @return 0 on success, a Kerberos error code otherwise.
2064 */
2065 krb5_error_code smb_krb5_kinit_password_ccache(krb5_context ctx,
2066 krb5_ccache cc,
2067 krb5_principal principal,
2068 const char *password,
2069 const char *target_service,
2070 krb5_get_init_creds_opt *krb_options,
2071 time_t *expire_time,
2072 time_t *kdc_time)
2073 {
2074 krb5_error_code code = 0;
2075 krb5_creds my_creds;
2076
2077 code = krb5_get_init_creds_password(ctx, &my_creds, principal,
2078 password, NULL, NULL, 0,
2079 target_service, krb_options);
2080 if (code) {
2081 return code;
2082 }
2083
2084 #ifndef SAMBA4_USES_HEIMDAL /* MIT */
2085 /*
2086 * We need to store the principal as returned from the KDC to the
2087 * credentials cache. If we don't do that the KRB5 library is not
2088 * able to find the tickets it is looking for
2089 */
2090 principal = my_creds.client;
2091 #endif
2092 code = krb5_cc_initialize(ctx, cc, principal);
2093 if (code) {
2094 goto done;
2095 }
2096
2097 code = krb5_cc_store_cred(ctx, cc, &my_creds);
2098 if (code) {
2099 goto done;
2100 }
2101
2102 if (expire_time) {
2103 *expire_time = (time_t) my_creds.times.endtime;
2104 }
2105
2106 if (kdc_time) {
2107 *kdc_time = (time_t) my_creds.times.starttime;
2108 }
2109
2110 code = 0;
2111 done:
2112 krb5_free_cred_contents(ctx, &my_creds);
2113 return code;
2114 }
2115
2116 #ifdef SAMBA4_USES_HEIMDAL
2117 /**
2118 * @brief Simulate a kinit by putting the tgt in the given credential cache.
2119 *
2120 * @param[in] ctx The library context
2121 *
2122 * @param[in] cc The credential cache to store the tgt in.
2123 *
2124 * @param[in] principal The initial client princial.
2125 *
2126 * @param[in] password The password (or NULL).
2127 *
2128 * @param[in] impersonate_principal The impersonatiion principal (or NULL).
2129 *
2130 * @param[in] self_service The local service for S4U2Self if
2131 * impersonate_principal is specified).
2132 *
2133 * @param[in] target_service The service name of the initial credentials
2134 * (kpasswd/REALM or a remote service). It defaults
2135 * to the krbtgt if NULL.
2136 *
2137 * @param[in] krb_options Initial credential options.
2138 *
2139 * @param[in] expire_time A pointer to store the experation time of the
2140 * credentials (or NULL).
2141 *
2142 * @param[in] kdc_time A pointer to store the time when the ticket becomes
2143 * valid (or NULL).
2144 *
2145 * @return 0 on success, a Kerberos error code otherwise.
2146 */
2147 krb5_error_code smb_krb5_kinit_s4u2_ccache(krb5_context ctx,
2148 krb5_ccache store_cc,
2149 krb5_principal init_principal,
2150 const char *init_password,
2151 krb5_principal impersonate_principal,
2152 const char *self_service,
2153 const char *target_service,
2154 krb5_get_init_creds_opt *krb_options,
2155 time_t *expire_time,
2156 time_t *kdc_time)
2157 {
2158 krb5_error_code code = 0;
2159 krb5_get_creds_opt options;
2160 krb5_principal store_principal;
2161 krb5_creds store_creds;
2162 krb5_creds *s4u2self_creds;
2163 Ticket s4u2self_ticket;
2164 size_t s4u2self_ticketlen;
2165 krb5_creds *s4u2proxy_creds;
2166 krb5_principal self_princ;
2167 bool s4u2proxy;
2168 krb5_principal target_princ;
2169 krb5_ccache tmp_cc;
2170 const char *self_realm;
2171 const char *client_realm = NULL;
2172 krb5_principal blacklist_principal = NULL;
2173 krb5_principal whitelist_principal = NULL;
2174
2175 code = krb5_get_init_creds_password(ctx, &store_creds,
2176 init_principal,
2177 init_password,
2178 NULL, NULL,
2179 0,
2180 NULL,
2181 krb_options);
2182 if (code != 0) {
2183 return code;
2184 }
2185
2186 store_principal = init_principal;
2187
2188 /*
2189 * We are trying S4U2Self now:
2190 *
2191 * As we do not want to expose our TGT in the
2192 * krb5_ccache, which is also holds the impersonated creds.
2193 *
2194 * Some low level krb5/gssapi function might use the TGT
2195 * identity and let the client act as our machine account.
2196 *
2197 * We need to avoid that and use a temporary krb5_ccache
2198 * in order to pass our TGT to the krb5_get_creds() function.
2199 */
2200 code = krb5_cc_new_unique(ctx, NULL, NULL, &tmp_cc);
2201 if (code != 0) {
2202 krb5_free_cred_contents(ctx, &store_creds);
2203 return code;
2204 }
2205
2206 code = krb5_cc_initialize(ctx, tmp_cc, store_creds.client);
2207 if (code != 0) {
2208 krb5_cc_destroy(ctx, tmp_cc);
2209 krb5_free_cred_contents(ctx, &store_creds);
2210 return code;
2211 }
2212
2213 code = krb5_cc_store_cred(ctx, tmp_cc, &store_creds);
2214 if (code != 0) {
2215 krb5_free_cred_contents(ctx, &store_creds);
2216 krb5_cc_destroy(ctx, tmp_cc);
2217 return code;
2218 }
2219
2220 /*
2221 * we need to remember the client principal of our
2222 * TGT and make sure the KDC does not return this
2223 * in the impersonated tickets. This can happen
2224 * if the KDC does not support S4U2Self and S4U2Proxy.
2225 */
2226 blacklist_principal = store_creds.client;
2227 store_creds.client = NULL;
2228 krb5_free_cred_contents(ctx, &store_creds);
2229
2230 /*
2231 * Check if we also need S4U2Proxy or if S4U2Self is
2232 * enough in order to get a ticket for the target.
2233 */
2234 if (target_service == NULL) {
2235 s4u2proxy = false;
2236 } else if (strcmp(target_service, self_service) == 0) {
2237 s4u2proxy = false;
2238 } else {
2239 s4u2proxy = true;
2240 }
2241
2242 /*
2243 * For S4U2Self we need our own service principal,
2244 * which belongs to our own realm (available on
2245 * our client principal).
2246 */
2247 self_realm = krb5_principal_get_realm(ctx, init_principal);
2248
2249 code = krb5_parse_name(ctx, self_service, &self_princ);
2250 if (code != 0) {
2251 krb5_free_principal(ctx, blacklist_principal);
2252 krb5_cc_destroy(ctx, tmp_cc);
2253 return code;
2254 }
2255
2256 code = krb5_principal_set_realm(ctx, self_princ, self_realm);
2257 if (code != 0) {
2258 krb5_free_principal(ctx, blacklist_principal);
2259 krb5_free_principal(ctx, self_princ);
2260 krb5_cc_destroy(ctx, tmp_cc);
2261 return code;
2262 }
2263
2264 code = krb5_get_creds_opt_alloc(ctx, &options);
2265 if (code != 0) {
2266 krb5_free_principal(ctx, blacklist_principal);
2267 krb5_free_principal(ctx, self_princ);
2268 krb5_cc_destroy(ctx, tmp_cc);
2269 return code;
2270 }
2271
2272 if (s4u2proxy) {
2273 /*
2274 * If we want S4U2Proxy, we need the forwardable flag
2275 * on the S4U2Self ticket.
2276 */
2277 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
2278 }
2279
2280 code = krb5_get_creds_opt_set_impersonate(ctx, options,
2281 impersonate_principal);
2282 if (code != 0) {
2283 krb5_get_creds_opt_free(ctx, options);
2284 krb5_free_principal(ctx, blacklist_principal);
2285 krb5_free_principal(ctx, self_princ);
2286 krb5_cc_destroy(ctx, tmp_cc);
2287 return code;
2288 }
2289
2290 code = krb5_get_creds(ctx, options, tmp_cc,
2291 self_princ, &s4u2self_creds);
2292 krb5_get_creds_opt_free(ctx, options);
2293 krb5_free_principal(ctx, self_princ);
2294 if (code != 0) {
2295 krb5_free_principal(ctx, blacklist_principal);
2296 krb5_cc_destroy(ctx, tmp_cc);
2297 return code;
2298 }
2299
2300 if (!s4u2proxy) {
2301 krb5_cc_destroy(ctx, tmp_cc);
2302
2303 /*
2304 * Now make sure we store the impersonated principal
2305 * and creds instead of the TGT related stuff
2306 * in the krb5_ccache of the caller.
2307 */
2308 code = krb5_copy_creds_contents(ctx, s4u2self_creds,
2309 &store_creds);
2310 krb5_free_creds(ctx, s4u2self_creds);
2311 if (code != 0) {
2312 return code;
2313 }
2314
2315 /*
2316 * It's important to store the principal the KDC
2317 * returned, as otherwise the caller would not find
2318 * the S4U2Self ticket in the krb5_ccache lookup.
2319 */
2320 store_principal = store_creds.client;
2321 goto store;
2322 }
2323
2324 /*
2325 * We are trying S4U2Proxy:
2326 *
2327 * We need the ticket from the S4U2Self step
2328 * and our TGT in order to get the delegated ticket.
2329 */
2330 code = decode_Ticket((const uint8_t *)s4u2self_creds->ticket.data,
2331 s4u2self_creds->ticket.length,
2332 &s4u2self_ticket,
2333 &s4u2self_ticketlen);
2334 if (code != 0) {
2335 krb5_free_creds(ctx, s4u2self_creds);
2336 krb5_free_principal(ctx, blacklist_principal);
2337 krb5_cc_destroy(ctx, tmp_cc);
2338 return code;
2339 }
2340
2341 /*
2342 * we need to remember the client principal of the
2343 * S4U2Self stage and as it needs to match the one we
2344 * will get for the S4U2Proxy stage. We need this
2345 * in order to detect KDCs which does not support S4U2Proxy.
2346 */
2347 whitelist_principal = s4u2self_creds->client;
2348 s4u2self_creds->client = NULL;
2349 krb5_free_creds(ctx, s4u2self_creds);
2350
2351 /*
2352 * For S4U2Proxy we also got a target service principal,
2353 * which also belongs to our own realm (available on
2354 * our client principal).
2355 */
2356 code = krb5_parse_name(ctx, target_service, &target_princ);
2357 if (code != 0) {
2358 free_Ticket(&s4u2self_ticket);
2359 krb5_free_principal(ctx, whitelist_principal);
2360 krb5_free_principal(ctx, blacklist_principal);
2361 krb5_cc_destroy(ctx, tmp_cc);
2362 return code;
2363 }
2364
2365 code = krb5_principal_set_realm(ctx, target_princ, self_realm);
2366 if (code != 0) {
2367 free_Ticket(&s4u2self_ticket);
2368 krb5_free_principal(ctx, target_princ);
2369 krb5_free_principal(ctx, whitelist_principal);
2370 krb5_free_principal(ctx, blacklist_principal);
2371 krb5_cc_destroy(ctx, tmp_cc);
2372 return code;
2373 }
2374
2375 code = krb5_get_creds_opt_alloc(ctx, &options);
2376 if (code != 0) {
2377 free_Ticket(&s4u2self_ticket);
2378 krb5_free_principal(ctx, target_princ);
2379 krb5_free_principal(ctx, whitelist_principal);
2380 krb5_free_principal(ctx, blacklist_principal);
2381 krb5_cc_destroy(ctx, tmp_cc);
2382 return code;
2383 }
2384
2385 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
2386 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_CONSTRAINED_DELEGATION);
2387
2388 code = krb5_get_creds_opt_set_ticket(ctx, options, &s4u2self_ticket);
2389 free_Ticket(&s4u2self_ticket);
2390 if (code != 0) {
2391 krb5_get_creds_opt_free(ctx, options);
2392 krb5_free_principal(ctx, target_princ);
2393 krb5_free_principal(ctx, whitelist_principal);
2394 krb5_free_principal(ctx, blacklist_principal);
2395 krb5_cc_destroy(ctx, tmp_cc);
2396 return code;
2397 }
2398
2399 code = krb5_get_creds(ctx, options, tmp_cc,
2400 target_princ, &s4u2proxy_creds);
2401 krb5_get_creds_opt_free(ctx, options);
2402 krb5_free_principal(ctx, target_princ);
2403 krb5_cc_destroy(ctx, tmp_cc);
2404 if (code != 0) {
2405 krb5_free_principal(ctx, whitelist_principal);
2406 krb5_free_principal(ctx, blacklist_principal);
2407 return code;
2408 }
2409
2410 /*
2411 * Now make sure we store the impersonated principal
2412 * and creds instead of the TGT related stuff
2413 * in the krb5_ccache of the caller.
2414 */
2415 code = krb5_copy_creds_contents(ctx, s4u2proxy_creds,
2416 &store_creds);
2417 krb5_free_creds(ctx, s4u2proxy_creds);
2418 if (code != 0) {
2419 krb5_free_principal(ctx, whitelist_principal);
2420 krb5_free_principal(ctx, blacklist_principal);
2421 return code;
2422 }
2423
2424 /*
2425 * It's important to store the principal the KDC
2426 * returned, as otherwise the caller would not find
2427 * the S4U2Self ticket in the krb5_ccache lookup.
2428 */
2429 store_principal = store_creds.client;
2430
2431 store:
2432 if (blacklist_principal &&
2433 krb5_principal_compare(ctx, store_creds.client, blacklist_principal)) {
2434 char *sp = NULL;
2435 char *ip = NULL;
2436
2437 code = krb5_unparse_name(ctx, blacklist_principal, &sp);
2438 if (code != 0) {
2439 sp = NULL;
2440 }
2441 code = krb5_unparse_name(ctx, impersonate_principal, &ip);
2442 if (code != 0) {
2443 ip = NULL;
2444 }
2445 DEBUG(1, ("smb_krb5_kinit_password_cache: "
2446 "KDC returned self principal[%s] while impersonating [%s]\n",
2447 sp?sp:"<no memory>",
2448 ip?ip:"<no memory>"));
2449
2450 SAFE_FREE(sp);
2451 SAFE_FREE(ip);
2452
2453 krb5_free_principal(ctx, whitelist_principal);
2454 krb5_free_principal(ctx, blacklist_principal);
2455 krb5_free_cred_contents(ctx, &store_creds);
2456 return KRB5_FWD_BAD_PRINCIPAL;
2457 }
2458 if (blacklist_principal) {
2459 krb5_free_principal(ctx, blacklist_principal);
2460 }
2461
2462 if (whitelist_principal &&
2463 !krb5_principal_compare(ctx, store_creds.client, whitelist_principal)) {
2464 char *sp = NULL;
2465 char *ep = NULL;
2466
2467 code = krb5_unparse_name(ctx, store_creds.client, &sp);
2468 if (code != 0) {
2469 sp = NULL;
2470 }
2471 code = krb5_unparse_name(ctx, whitelist_principal, &ep);
2472 if (code != 0) {
2473 ep = NULL;
2474 }
2475 DEBUG(1, ("smb_krb5_kinit_password_cache: "
2476 "KDC returned wrong principal[%s] we expected [%s]\n",
2477 sp?sp:"<no memory>",
2478 ep?ep:"<no memory>"));
2479
2480 SAFE_FREE(sp);
2481 SAFE_FREE(ep);
2482
2483 krb5_free_principal(ctx, whitelist_principal);
2484 krb5_free_cred_contents(ctx, &store_creds);
2485 return KRB5_FWD_BAD_PRINCIPAL;
2486 }
2487 if (whitelist_principal) {
2488 krb5_free_principal(ctx, whitelist_principal);
2489 }
2490
2491 code = krb5_cc_initialize(ctx, store_cc, store_principal);
2492 if (code != 0) {
2493 krb5_free_cred_contents(ctx, &store_creds);
2494 return code;
2495 }
2496
2497 code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
2498 if (code != 0) {
2499 krb5_free_cred_contents(ctx, &store_creds);
2500 return code;
2501 }
2502
2503 client_realm = krb5_principal_get_realm(ctx, store_creds.client);
2504 if (client_realm != NULL) {
2505 /*
2506 * Because the CANON flag doesn't have any impact
2507 * on the impersonate_principal => store_creds.client
2508 * realm mapping. We need to store the credentials twice,
2509 * once with the returned realm and once with the
2510 * realm of impersonate_principal.
2511 */
2512 code = krb5_principal_set_realm(ctx, store_creds.server,
2513 client_realm);
2514 if (code != 0) {
2515 krb5_free_cred_contents(ctx, &store_creds);
2516 return code;
2517 }
2518
2519 code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
2520 if (code != 0) {
2521 krb5_free_cred_contents(ctx, &store_creds);
2522 return code;
2523 }
2524 }
2525
2526 if (expire_time) {
2527 *expire_time = (time_t) store_creds.times.endtime;
2528 }
2529
2530 if (kdc_time) {
2531 *kdc_time = (time_t) store_creds.times.starttime;
2532 }
2533
2534 krb5_free_cred_contents(ctx, &store_creds);
2535
2536 return 0;
2537 }
2538 #endif
2539
2540 #if !defined(HAVE_KRB5_MAKE_PRINCIPAL) && defined(HAVE_KRB5_BUILD_PRINCIPAL_ALLOC_VA)
2541 /**
2542 * @brief Create a principal name using a variable argument list.
2543 *
2544 * @param[in] context The library context.
2545 *
2546 * @param[inout] principal A pointer to the principal structure.
2547 *
2548 * @param[in] _realm The realm to use. If NULL then the function will
2549 * get the default realm name.
2550 *
2551 * @param[in] ... A list of 'char *' components, ending with NULL.
2552 *
2553 * Use krb5_free_principal() to free the principal when it is no longer needed.
2554 *
2555 * @return 0 on success, a Kerberos error code otherwise.
2556 */
2557 krb5_error_code smb_krb5_make_principal(krb5_context context,
2558 krb5_principal *principal,
2559 const char *_realm, ...)
2560 {
2561 krb5_error_code code;
2562 bool free_realm;
2563 char *realm;
2564 va_list ap;
2565
2566 if (_realm) {
2567 realm = discard_const_p(char, _realm);
2568 free_realm = false;
2569 } else {
2570 code = krb5_get_default_realm(context, &realm);
2571 if (code) {
2572 return code;
2573 }
2574 free_realm = true;
2575 }
2576
2577 va_start(ap, _realm);
2578 code = krb5_build_principal_alloc_va(context, principal,
2579 strlen(realm), realm,
2580 ap);
2581 va_end(ap);
2582
2583 if (free_realm) {
2584 krb5_free_default_realm(context, realm);
2585 }
2586
2587 return code;
2588 }
2589 #endif
2590
2591 #if !defined(HAVE_KRB5_CC_GET_LIFETIME) && defined(HAVE_KRB5_CC_RETRIEVE_CRED)
2592 /**
2593 * @brief Get the lifetime of the initial ticket in the cache.
2594 *
2595 * @param[in] context The kerberos context.
2596 *
2597 * @param[in] id The credential cache to get the ticket lifetime.
2598 *
2599 * @param[out] t A pointer to a time value to store the lifetime.
2600 *
2601 * @return 0 on success, a krb5_error_code on error.
2602 */
2603 krb5_error_code smb_krb5_cc_get_lifetime(krb5_context context,
2604 krb5_ccache id,
2605 time_t *t)
2606 {
2607 krb5_cc_cursor cursor;
2608 krb5_error_code kerr;
2609 krb5_creds cred;
2610 krb5_timestamp now;
2611
2612 *t = 0;
2613
2614 kerr = krb5_timeofday(context, &now);
2615 if (kerr) {
2616 return kerr;
2617 }
2618
2619 kerr = krb5_cc_start_seq_get(context, id, &cursor);
2620 if (kerr) {
2621 return kerr;
2622 }
2623
2624 while ((kerr = krb5_cc_next_cred(context, id, &cursor, &cred)) == 0) {
2625 #ifndef HAVE_FLAGS_IN_KRB5_CREDS
2626 if (cred.ticket_flags & TKT_FLG_INITIAL) {
2627 #else
2628 if (cred.flags.b.initial) {
2629 #endif
2630 if (now < cred.times.endtime) {
2631 *t = (time_t) (cred.times.endtime - now);
2632 }
2633 krb5_free_cred_contents(context, &cred);
2634 break;
2635 }
2636 krb5_free_cred_contents(context, &cred);
2637 }
2638
2639 krb5_cc_end_seq_get(context, id, &cursor);
2640
2641 return kerr;
2642 }
2643 #endif /* HAVE_KRB5_CC_GET_LIFETIME */
2644
2645 #if !defined(HAVE_KRB5_FREE_CHECKSUM_CONTENTS) && defined(HAVE_FREE_CHECKSUM)
2646 void smb_krb5_free_checksum_contents(krb5_context ctx, krb5_checksum *cksum)
2647 {
2648 free_Checksum(cksum);
2649 }
2650 #endif
2651
2652 /**
2653 * @brief Compute a checksum operating on a keyblock.
2654 *
2655 * This function computes a checksum over a PAC using the keyblock for a keyed
2656 * checksum.
2657 *
2658 * @param[in] mem_ctx A talloc context to alocate the signature on.
2659 *
2660 * @param[in] pac_data The PAC as input.
2661 *
2662 * @param[in] context The library context.
2663 *
2664 * @param[in] keyblock Encryption key for a keyed checksum.
2665 *
2666 * @param[out] sig_type The checksum type
2667 *
2668 * @param[out] sig_blob The talloc'ed checksum
2669 *
2670 * The caller must free the sig_blob with talloc_free() when it is not needed
2671 * anymore.
2672 *
2673 * @return 0 on success, a Kerberos error code otherwise.
2674 */
2675 krb5_error_code smb_krb5_make_pac_checksum(TALLOC_CTX *mem_ctx,
2676 DATA_BLOB *pac_data,
2677 krb5_context context,
2678 const krb5_keyblock *keyblock,
2679 uint32_t *sig_type,
2680 DATA_BLOB *sig_blob)
2681 {
2682 krb5_error_code ret;
2683 krb5_checksum cksum;
2684 #if defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CREATE_CHECKSUM)
2685 krb5_crypto crypto;
2686
2687
2688 ret = krb5_crypto_init(context,
2689 keyblock,
2690 0,
2691 &crypto);
2692 if (ret) {
2693 DEBUG(0,("krb5_crypto_init() failed: %s\n",
2694 smb_get_krb5_error_message(context, ret, mem_ctx)));
2695 return ret;
2696 }
2697 ret = krb5_create_checksum(context,
2698 crypto,
2699 KRB5_KU_OTHER_CKSUM,
2700 0,
2701 pac_data->data,
2702 pac_data->length,
2703 &cksum);
2704 if (ret) {
2705 DEBUG(2, ("PAC Verification failed: %s\n",
2706 smb_get_krb5_error_message(context, ret, mem_ctx)));
2707 }
2708
2709 krb5_crypto_destroy(context, crypto);
2710
2711 if (ret) {
2712 return ret;
2713 }
2714
2715 *sig_type = cksum.cksumtype;
2716 *sig_blob = data_blob_talloc(mem_ctx,
2717 cksum.checksum.data,
2718 cksum.checksum.length);
2719 #elif defined(HAVE_KRB5_C_MAKE_CHECKSUM)
2720 krb5_data input;
2721
2722 input.data = (char *)pac_data->data;
2723 input.length = pac_data->length;
2724
2725 ret = krb5_c_make_checksum(context,
2726 0,
2727 keyblock,
2728 KRB5_KEYUSAGE_APP_DATA_CKSUM,
2729 &input,
2730 &cksum);
2731 if (ret) {
2732 DEBUG(2, ("PAC Verification failed: %s\n",
2733 smb_get_krb5_error_message(context, ret, mem_ctx)));
2734 return ret;
2735 }
2736
2737 *sig_type = cksum.checksum_type;
2738 *sig_blob = data_blob_talloc(mem_ctx,
2739 cksum.contents,
2740 cksum.length);
2741
2742 #else
2743 #error krb5_create_checksum or krb5_c_make_checksum not available
2744 #endif /* HAVE_KRB5_C_MAKE_CHECKSUM */
2745 smb_krb5_free_checksum_contents(context, &cksum);
2746
2747 return 0;
2748 }
2749
2750
2751 /**
2752 * @brief Get realm of a principal
2753 *
2754 * @param[in] context The library context
2755 *
2756 * @param[in] principal The principal to get the realm from.
2757 *
2758 * @return An allocated string with the realm or NULL if an error occurred.
2759 *
2760 * The caller must free the realm string with free() if not needed anymore.
2761 */
2762 char *smb_krb5_principal_get_realm(krb5_context context,
2763 krb5_const_principal principal)
2764 {
2765 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2766 return strdup(discard_const_p(char, krb5_principal_get_realm(context, principal)));
2767 #elif defined(krb5_princ_realm) /* MIT */
2768 krb5_data *realm;
2769 realm = discard_const_p(krb5_data,
2770 krb5_princ_realm(context, principal));
2771 return strndup(realm->data, realm->length);
2772 #else
2773 #error UNKNOWN_GET_PRINC_REALM_FUNCTIONS
2774 #endif
2775 }
2776
2777 /**
2778 * @brief Get realm of a principal
2779 *
2780 * @param[in] context The library context
2781 *
2782 * @param[in] principal The principal to set the realm
2783 *
2784 * @param[in] realm The realm as a string to set.
2785 *
2786 * @retur 0 on success, a Kerberos error code otherwise.
2787 */
2788 krb5_error_code smb_krb5_principal_set_realm(krb5_context context,
2789 krb5_principal principal,
2790 const char *realm)
2791 {
2792 #ifdef HAVE_KRB5_PRINCIPAL_SET_REALM /* Heimdal */
2793 return krb5_principal_set_realm(context, principal, realm);
2794 #elif defined(krb5_princ_realm) && defined(krb5_princ_set_realm) /* MIT */
2795 krb5_error_code ret;
2796 krb5_data data;
2797 krb5_data *old_data;
2798
2799 old_data = krb5_princ_realm(context, principal);
2800
2801 ret = smb_krb5_copy_data_contents(&data,
2802 realm,
2803 strlen(realm));
2804 if (ret) {
2805 return ret;
2806 }
2807
2808 /* free realm before setting */
2809 free(old_data->data);
2810
2811 krb5_princ_set_realm(context, principal, &data);
2812
2813 return ret;
2814 #else
2815 #error UNKNOWN_PRINC_SET_REALM_FUNCTION
2816 #endif
2817 }
2818
2819
2820 /**
2821 * @brief Get the realm from the service hostname.
2822 *
2823 * This function will look for a domain realm mapping in the [domain_realm]
2824 * section of the krb5.conf first and fallback to extract the realm from
2825 * the provided service hostname. As a last resort it will return the
2826 * provided client_realm.
2827 *
2828 * @param[in] mem_ctx The talloc context
2829 *
2830 * @param[in] hostname The service hostname
2831 *
2832 * @param[in] client_realm If we can not find a mapping, fall back to
2833 * this realm.
2834 *
2835 * @return The realm to use for the service hostname, NULL if a fatal error
2836 * occured.
2837 */
2838 char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
2839 const char *hostname,
2840 const char *client_realm)
2841 {
2842 #if defined(HAVE_KRB5_REALM_TYPE)
2843 /* Heimdal. */
2844 krb5_realm *realm_list = NULL;
2845 #else
2846 /* MIT */
2847 char **realm_list = NULL;
2848 #endif
2849 char *realm = NULL;
2850 krb5_error_code kerr;
2851 krb5_context ctx = NULL;
2852
2853 initialize_krb5_error_table();
2854 if (krb5_init_context(&ctx)) {
2855 return NULL;
2856 }
2857
2858 kerr = krb5_get_host_realm(ctx, hostname, &realm_list);
2859 if (kerr == KRB5_ERR_HOST_REALM_UNKNOWN) {
2860 realm_list = NULL;
2861 kerr = 0;
2862 }
2863 if (kerr != 0) {
2864 DEBUG(3,("kerberos_get_realm_from_hostname %s: "
2865 "failed %s\n",
2866 hostname ? hostname : "(NULL)",
2867 error_message(kerr) ));
2868 goto out;
2869 }
2870
2871 if (realm_list != NULL &&
2872 realm_list[0] != NULL &&
2873 realm_list[0][0] != '\0') {
2874 realm = talloc_strdup(mem_ctx, realm_list[0]);
2875 if (realm == NULL) {
2876 goto out;
2877 }
2878 } else {
2879 const char *p = NULL;
2880
2881 /*
2882 * "dc6.samba2003.example.com"
2883 * returns a realm of "SAMBA2003.EXAMPLE.COM"
2884 *
2885 * "dc6." returns realm as NULL
2886 */
2887 p = strchr_m(hostname, '.');
2888 if (p != NULL && p[1] != '\0') {
2889 realm = talloc_strdup_upper(mem_ctx, p + 1);
2890 if (realm == NULL) {
2891 goto out;
2892 }
2893 }
2894 }
2895
2896 if (realm == NULL) {
2897 realm = talloc_strdup(mem_ctx, client_realm);
2898 }
2899
2900 out:
2901
2902 if (ctx) {
2903 if (realm_list) {
2904 krb5_free_host_realm(ctx, realm_list);
2905 realm_list = NULL;
2906 }
2907 krb5_free_context(ctx);
2908 ctx = NULL;
2909 }
2910 return realm;
2911 }
2912
2913 /**
2914 * @brief Get an error string from a Kerberos error code.
2915 *
2916 * @param[in] context The library context.
2917 *
2918 * @param[in] code The Kerberos error code.
2919 *
2920 * @param[in] mem_ctx The talloc context to allocate the error string on.
2921 *
2922 * @return A talloc'ed error string or NULL if an error occurred.
2923 *
2924 * The caller must free the returned error string with talloc_free() if not
2925 * needed anymore
2926 */
2927 char *smb_get_krb5_error_message(krb5_context context,
2928 krb5_error_code code,
2929 TALLOC_CTX *mem_ctx)
2930 {
2931 char *ret;
2932
2933 #if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
2934 const char *context_error = krb5_get_error_message(context, code);
2935 if (context_error) {
2936 ret = talloc_asprintf(mem_ctx, "%s: %s",
2937 error_message(code), context_error);
2938 krb5_free_error_message(context, context_error);
2939 return ret;
2940 }
2941 #endif
2942 ret = talloc_strdup(mem_ctx, error_message(code));
2943 return ret;
2944 }
2945
2946
2947 /**
2948 * @brief Return the kerberos library setting for: libdefaults:allow_weak_crypto
2949 *
2950 * @param[in] context The library context
2951 *
2952 * @return True if weak crypto is allowed, false if not.
2953 */
2954 krb5_boolean smb_krb5_get_allowed_weak_crypto(krb5_context context)
2955 #if defined(HAVE_KRB5_CONFIG_GET_BOOL_DEFAULT)
2956 {
2957 return krb5_config_get_bool_default(context,
2958 NULL,
2959 FALSE,
2960 "libdefaults",
2961 "allow_weak_crypto",
2962 NULL);
2963 }
2964 #elif defined(HAVE_PROFILE_H) && defined(HAVE_KRB5_GET_PROFILE)
2965 {
2966 #include <profile.h>
2967 krb5_error_code ret;
2968 krb5_boolean ret_default = false;
2969 profile_t profile;
2970 int ret_profile;
2971
2972 ret = krb5_get_profile(context,
2973 &profile);
2974 if (ret) {
2975 return ret_default;
2976 }
2977
2978 ret = profile_get_boolean(profile,
2979 "libdefaults",
2980 "allow_weak_crypto",
2981 NULL, /* subsubname */
2982 ret_default, /* def_val */
2983 &ret_profile /* *ret_default */);
2984 if (ret) {
2985 return ret_default;
2986 }
2987
2988 profile_release(profile);
2989
2990 return ret_profile;
2991 }
2992 #else
2993 #error UNKNOWN_KRB5_CONFIG_ROUTINES
2994 #endif
2995
2996 /**
2997 * @brief Return the type of a krb5_principal
2998 *
2999 * @param[in] context The library context.
3000 *
3001 * @param[in] principal The principal to get the type from.
3002 *
3003 * @return The integer type of the principal.
3004 */
3005 int smb_krb5_principal_get_type(krb5_context context,
3006 krb5_const_principal principal)
3007 {
3008 #ifdef HAVE_KRB5_PRINCIPAL_GET_TYPE /* Heimdal */
3009 return krb5_principal_get_type(context, principal);
3010 #elif defined(krb5_princ_type) /* MIT */
3011 return krb5_princ_type(context, principal);
3012 #else
3013 #error UNKNOWN_PRINC_GET_TYPE_FUNCTION
3014 #endif
3015 }
3016
3017 /**
3018 * @brief Set the type of a principal
3019 *
3020 * @param[in] context The library context
3021 *
3022 * @param[inout] principal The principal to set the type for.
3023 *
3024 * @param[in] type The principal type to set.
3025 */
3026 void smb_krb5_principal_set_type(krb5_context context,
3027 krb5_principal principal,
3028 int type)
3029 {
3030 #ifdef HAVE_KRB5_PRINCIPAL_SET_TYPE /* Heimdal */
3031 krb5_principal_set_type(context, principal, type);
3032 #elif defined(krb5_princ_type) /* MIT */
3033 krb5_princ_type(context, principal) = type;
3034 #else
3035 #error UNKNOWN_PRINC_SET_TYPE_FUNCTION
3036 #endif
3037 }
3038
3039 #if !defined(HAVE_KRB5_WARNX)
3040 /**
3041 * @brief Log a Kerberos message
3042 *
3043 * It sends the message to com_err.
3044 *
3045 * @param[in] context The library context
3046 *
3047 * @param[in] fmt The message format
3048 *
3049 * @param[in] ... The message arguments
3050 *
3051 * @return 0 on success.
3052 */
3053 krb5_error_code krb5_warnx(krb5_context context, const char *fmt, ...)
3054 {
3055 va_list args;
3056
3057 va_start(args, fmt);
3058 com_err_va("samba-kdc", errno, fmt, args);
3059 va_end(args);
3060
3061 return 0;
3062 }
3063 #endif
3064
3065 /**
3066 * @brief Copy a credential cache.
3067 *
3068 * @param[in] context The library context.
3069 *
3070 * @param[in] incc Credential cache to be copied.
3071 *
3072 * @param[inout] outcc Copy of credential cache to be filled in.
3073 *
3074 * @return 0 on success, a Kerberos error code otherwise.
3075 */
3076 krb5_error_code smb_krb5_cc_copy_creds(krb5_context context,
3077 krb5_ccache incc, krb5_ccache outcc)
3078 {
3079 #ifdef HAVE_KRB5_CC_COPY_CACHE /* Heimdal */
3080 return krb5_cc_copy_cache(context, incc, outcc);
3081 #elif defined(HAVE_KRB5_CC_COPY_CREDS)
3082 krb5_error_code ret;
3083 krb5_principal princ = NULL;
3084
3085 ret = krb5_cc_get_principal(context, incc, &princ);
3086 if (ret != 0) {
3087 return ret;
3088 }
3089 ret = krb5_cc_initialize(context, outcc, princ);
3090 krb5_free_principal(context, princ);
3091 if (ret != 0) {
3092 return ret;
3093 }
3094 return krb5_cc_copy_creds(context, incc, outcc);
3095 #else
3096 #error UNKNOWN_KRB5_CC_COPY_CACHE_OR_CREDS_FUNCTION
3097 #endif
3098 }
3099
3100 /**********************************************************
3101 * ADS KRB5 CALLS
3102 **********************************************************/
3103
3104 static bool ads_cleanup_expired_creds(krb5_context context,
3105 krb5_ccache ccache,
3106 krb5_creds *credsp)
3107 {
3108 krb5_error_code retval;
3109 const char *cc_type = krb5_cc_get_type(context, ccache);
3110
3111 DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
3112 cc_type, krb5_cc_get_name(context, ccache),
3113 http_timestring(talloc_tos(), credsp->times.endtime)));
3114
3115 /* we will probably need new tickets if the current ones
3116 will expire within 10 seconds.
3117 */
3118 if (credsp->times.endtime >= (time(NULL) + 10))
3119 return false;
3120
3121 /* heimdal won't remove creds from a file ccache, and
3122 perhaps we shouldn't anyway, since internally we
3123 use memory ccaches, and a FILE one probably means that
3124 we're using creds obtained outside of our exectuable
3125 */
3126 if (strequal(cc_type, "FILE")) {
3127 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
3128 return false;
3129 }
3130
3131 retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
3132 if (retval) {
3133 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
3134 error_message(retval)));
3135 /* If we have an error in this, we want to display it,
3136 but continue as though we deleted it */
3137 }
3138 return true;
3139 }
3140
3141 /* Allocate and setup the auth context into the state we need. */
3142
3143 static krb5_error_code ads_setup_auth_context(krb5_context context,
3144 krb5_auth_context *auth_context)
3145 {
3146 krb5_error_code retval;
3147
3148 retval = krb5_auth_con_init(context, auth_context );
3149 if (retval) {
3150 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
3151 error_message(retval)));
3152 return retval;
3153 }
3154
3155 /* Ensure this is an addressless ticket. */
3156 retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
3157 if (retval) {
3158 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
3159 error_message(retval)));
3160 }
3161
3162 return retval;
3163 }
3164
3165 #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)
3166 static krb5_error_code ads_create_gss_checksum(krb5_data *in_data, /* [inout] */
3167 uint32_t gss_flags)
3168 {
3169 unsigned int orig_length = in_data->length;
3170 unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
3171 char *gss_cksum = NULL;
3172
3173 if (orig_length) {
3174 /* Extra length field for delgated ticket. */
3175 base_cksum_size += 4;
3176 }
3177
3178 if ((unsigned int)base_cksum_size + orig_length <
3179 (unsigned int)base_cksum_size) {
3180 return EINVAL;
3181 }
3182
3183 gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
3184 if (gss_cksum == NULL) {
3185 return ENOMEM;
3186 }
3187
3188 memset(gss_cksum, '\0', base_cksum_size + orig_length);
3189 SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
3190
3191 /*
3192 * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
3193 * This matches the behavior of heimdal and mit.
3194 *
3195 * And it is needed to work against some closed source
3196 * SMB servers.
3197 *
3198 * See bug #7883
3199 */
3200 memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
3201
3202 SIVAL(gss_cksum, 20, gss_flags);
3203
3204 if (orig_length) {
3205 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
3206 SSVAL(gss_cksum, 26, orig_length);
3207 /* Copy the kerberos KRB_CRED data */
3208 memcpy(gss_cksum + 28, in_data->data, orig_length);
3209 free(in_data->data);
3210 in_data->data = NULL;
3211 in_data->length = 0;
3212 }
3213 in_data->data = gss_cksum;
3214 in_data->length = base_cksum_size + orig_length;
3215 return 0;
3216 }
3217 #endif
3218
3219 /*
3220 * We can't use krb5_mk_req because w2k wants the service to be in a particular
3221 * format.
3222 */
3223 static krb5_error_code ads_krb5_mk_req(krb5_context context,
3224 krb5_auth_context *auth_context,
3225 const krb5_flags ap_req_options,
3226 const char *principal,
3227 krb5_ccache ccache,
3228 krb5_data *outbuf,
3229 time_t *expire_time,
3230 const char *impersonate_princ_s)
3231 {
3232 krb5_error_code retval;
3233 krb5_principal server;
3234 krb5_principal impersonate_princ = NULL;
3235 krb5_creds *credsp;
3236 krb5_creds creds;
3237 krb5_data in_data;
3238 bool creds_ready = false;
3239 int i = 0, maxtries = 3;
3240 bool ok;
3241
3242 ZERO_STRUCT(in_data);
3243
3244 retval = smb_krb5_parse_name(context, principal, &server);
3245 if (retval != 0) {
3246 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
3247 return retval;
3248 }
3249
3250 if (impersonate_princ_s) {
3251 retval = smb_krb5_parse_name(context, impersonate_princ_s,
3252 &impersonate_princ);
3253 if (retval) {
3254 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
3255 goto cleanup_princ;
3256 }
3257 }
3258
3259 /* obtain ticket & session key */
3260 ZERO_STRUCT(creds);
3261 if ((retval = krb5_copy_principal(context, server, &creds.server))) {
3262 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
3263 error_message(retval)));
3264 goto cleanup_princ;
3265 }
3266
3267 retval = krb5_cc_get_principal(context, ccache, &creds.client);
3268 if (retval != 0) {
3269 /* This can commonly fail on smbd startup with no ticket in the cache.
3270 * Report at higher level than 1. */
3271 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
3272 error_message(retval)));
3273 goto cleanup_creds;
3274 }
3275
3276 while (!creds_ready && (i < maxtries)) {
3277
3278 retval = smb_krb5_get_credentials(context,
3279 ccache,
3280 creds.client,
3281 creds.server,
3282 impersonate_princ,
3283 &credsp);
3284 if (retval != 0) {
3285 DBG_WARNING("smb_krb5_get_credentials failed for %s "
3286 "(%s)\n",
3287 principal,
3288 error_message(retval));
3289 goto cleanup_creds;
3290 }
3291
3292 /* cope with ticket being in the future due to clock skew */
3293 if ((unsigned)credsp->times.starttime > time(NULL)) {
3294 time_t t = time(NULL);
3295 int time_offset =(int)((unsigned)credsp->times.starttime-t);
3296 DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
3297 krb5_set_real_time(context, t + time_offset + 1, 0);
3298 }
3299
3300 ok = ads_cleanup_expired_creds(context, ccache, credsp);
3301 if (!ok) {
3302 creds_ready = true;
3303 }
3304
3305 i++;
3306 }
3307
3308 DBG_DEBUG("Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
3309 principal,
3310 krb5_cc_get_type(context, ccache),
3311 krb5_cc_get_name(context, ccache),
3312 http_timestring(talloc_tos(),
3313 (unsigned)credsp->times.endtime),
3314 (unsigned)credsp->times.endtime);
3315
3316 if (expire_time) {
3317 *expire_time = (time_t)credsp->times.endtime;
3318 }
3319
3320 /* Allocate the auth_context. */
3321 retval = ads_setup_auth_context(context, auth_context);
3322 if (retval != 0) {
3323 DBG_WARNING("ads_setup_auth_context failed (%s)\n",
3324 error_message(retval));
3325 goto cleanup_creds;
3326 }
3327
3328 #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)
3329 {
3330 uint32_t gss_flags = 0;
3331
3332 if (credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE) {
3333 /*
3334 * Fetch a forwarded TGT from the KDC so that we can
3335 * hand off a 2nd ticket as part of the kerberos
3336 * exchange.
3337 */
3338
3339 DBG_INFO("Server marked as OK to delegate to, building "
3340 "forwardable TGT\n");
3341
3342 retval = krb5_auth_con_setuseruserkey(context,
3343 *auth_context,
3344 &credsp->keyblock );
3345 if (retval != 0) {
3346 DBG_WARNING("krb5_auth_con_setuseruserkey "
3347 "failed (%s)\n",
3348 error_message(retval));
3349 goto cleanup_creds;
3350 }
3351
3352 /* Must use a subkey for forwarded tickets. */
3353 retval = krb5_auth_con_setflags(context,
3354 *auth_context,
3355 KRB5_AUTH_CONTEXT_USE_SUBKEY);
3356 if (retval != 0) {
3357 DBG_WARNING("krb5_auth_con_setflags failed (%s)\n",
3358 error_message(retval));
3359 goto cleanup_creds;
3360 }
3361
3362 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
3363 *auth_context, /* Authentication context [in] */
3364 discard_const_p(char, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
3365 credsp->client, /* Client principal for the tgt [in] */
3366 credsp->server, /* Server principal for the tgt [in] */
3367 ccache, /* Credential cache to use for storage [in] */
3368 1, /* Turn on for "Forwardable ticket" [in] */
3369 &in_data ); /* Resulting response [out] */
3370
3371 if (retval) {
3372 DBG_INFO("krb5_fwd_tgt_creds failed (%s)\n",
3373 error_message(retval));
3374
3375 /*
3376 * This is not fatal. Delete the *auth_context and continue
3377 * with krb5_mk_req_extended to get a non-forwardable ticket.
3378 */
3379
3380 if (in_data.data) {
3381 free( in_data.data );
3382 in_data.data = NULL;
3383 in_data.length = 0;
3384 }
3385 krb5_auth_con_free(context, *auth_context);
3386 *auth_context = NULL;
3387 retval = ads_setup_auth_context(context, auth_context);
3388 if (retval != 0) {
3389 DBG_WARNING("ads_setup_auth_context failed (%s)\n",
3390 error_message(retval));
3391 goto cleanup_creds;
3392 }
3393 } else {
3394 /* We got a delegated ticket. */
3395 gss_flags |= GSS_C_DELEG_FLAG;
3396 }
3397 }
3398
3399 /* Frees and reallocates in_data into a GSS checksum blob. */
3400 retval = ads_create_gss_checksum(&in_data, gss_flags);
3401 if (retval != 0) {
3402 goto cleanup_data;
3403 }
3404
3405 /* We always want GSS-checksum types. */
3406 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
3407 if (retval != 0) {
3408 DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
3409 error_message(retval)));
3410 goto cleanup_data;
3411 }
3412 }
3413 #endif
3414
3415 retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
3416 &in_data, credsp, outbuf);
3417 if (retval != 0) {
3418 DBG_WARNING("krb5_mk_req_extended failed (%s)\n",
3419 error_message(retval));
3420 }
3421
3422 #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)
3423 cleanup_data:
3424 #endif
3425
3426 if (in_data.data) {
3427 free( in_data.data );
3428 in_data.length = 0;
3429 }
3430
3431 krb5_free_creds(context, credsp);
3432
3433 cleanup_creds:
3434 krb5_free_cred_contents(context, &creds);
3435
3436 cleanup_princ:
3437 krb5_free_principal(context, server);
3438 if (impersonate_princ) {
3439 krb5_free_principal(context, impersonate_princ);
3440 }
3441
3442 return retval;
3443 }
3444
3445 /*
3446 get a kerberos5 ticket for the given service
3447 */
3448 int ads_krb5_cli_get_ticket(TALLOC_CTX *mem_ctx,
3449 const char *principal,
3450 time_t time_offset,
3451 DATA_BLOB *ticket,
3452 DATA_BLOB *session_key_krb5,
3453 uint32_t extra_ap_opts, const char *ccname,
3454 time_t *tgs_expire,
3455 const char *impersonate_princ_s)
3456 {
3457 krb5_error_code retval;
3458 krb5_data packet;
3459 krb5_context context = NULL;
3460 krb5_ccache ccdef = NULL;
3461 krb5_auth_context auth_context = NULL;
3462 krb5_enctype enc_types[] = {
3463 #ifdef HAVE_ENCTYPE_AES256_CTS_HMAC_SHA1_96
3464 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
3465 #endif
3466 #ifdef HAVE_ENCTYPE_AES128_CTS_HMAC_SHA1_96
3467 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
3468 #endif
3469 ENCTYPE_ARCFOUR_HMAC,
3470 ENCTYPE_DES_CBC_MD5,
3471 ENCTYPE_DES_CBC_CRC,
3472 ENCTYPE_NULL};
3473 bool ok;
3474
3475 initialize_krb5_error_table();
3476 retval = krb5_init_context(&context);
3477 if (retval != 0) {
3478 DBG_WARNING("krb5_init_context failed (%s)\n",
3479 error_message(retval));
3480 goto failed;
3481 }
3482
3483 if (time_offset != 0) {
3484 krb5_set_real_time(context, time(NULL) + time_offset, 0);
3485 }
3486
3487 retval = krb5_cc_resolve(context,
3488 ccname ? ccname : krb5_cc_default_name(context),
3489 &ccdef);
3490 if (retval != 0) {
3491 DBG_WARNING("krb5_cc_default failed (%s)\n",
3492 error_message(retval));
3493 goto failed;
3494 }
3495
3496 retval = krb5_set_default_tgs_ktypes(context, enc_types);
3497 if (retval != 0) {
3498 DBG_WARNING("krb5_set_default_tgs_ktypes failed (%s)\n",
3499 error_message(retval));
3500 goto failed;
3501 }
3502
3503 retval = ads_krb5_mk_req(context,
3504 &auth_context,
3505 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
3506 principal,
3507 ccdef,
3508 &packet,
3509 tgs_expire,
3510 impersonate_princ_s);
3511 if (retval != 0) {
3512 goto failed;
3513 }
3514
3515 ok = smb_krb5_get_smb_session_key(mem_ctx,
3516 context,
3517 auth_context,
3518 session_key_krb5,
3519 false);
3520 if (!ok) {
3521 retval = ENOMEM;
3522 goto failed;
3523 }
3524
3525 *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
3526
3527 smb_krb5_free_data_contents(context, &packet);
3528
3529 failed:
3530
3531 if (context) {
3532 if (ccdef) {
3533 krb5_cc_close(context, ccdef);
3534 }
3535 if (auth_context) {
3536 krb5_auth_con_free(context, auth_context);
3537 }
3538 krb5_free_context(context);
3539 }
3540
3541 return retval;
3542 }
3543
3544 #else /* HAVE_KRB5 */
3545 /* This saves a few linking headaches */
3546 int ads_krb5_cli_get_ticket(TALLOC_CTX *mem_ctx,
3547 const char *principal,
3548 time_t time_offset,
3549 DATA_BLOB *ticket,
3550 DATA_BLOB *session_key_krb5,
3551 uint32_t extra_ap_opts, const char *ccname,
3552 time_t *tgs_expire,
3553 const char *impersonate_princ_s)
3554 {
3555 DEBUG(0,("NO KERBEROS SUPPORT\n"));
3556 return 1;
3557 }
3558
3559 #endif /* HAVE_KRB5 */
Samba GIT mirror