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winbindd: let wb_lookupsids_move_name() handle domain_index UINT32_MAX
[Samba.git] / lib / krb5_wrap / krb5_samba.c
blob2e43f797144098db3a855fb1a6d18372713592ac
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 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
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 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
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 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
426 /**
427 * @brief Get a list of encryption types allowed for session keys
428 *
429 * @param[in] context The library context
430 *
431 * @param[in] enctypes An allocated, zero-terminated list of encryption types
432 *
433 * This function returns an allocated list of encryption types allowed for
434 * session keys.
435 *
436 * Use free() to free the enctypes when it is no longer needed.
437 *
438 * @retval 0 Success; otherwise - Kerberos error codes
439 */
440 krb5_error_code smb_krb5_get_allowed_etypes(krb5_context context,
441 krb5_enctype **enctypes)
442 {
443 return krb5_get_permitted_enctypes(context, enctypes);
444 }
445 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
446 krb5_error_code smb_krb5_get_allowed_etypes(krb5_context context,
447 krb5_enctype **enctypes)
448 {
449 #ifdef HAVE_KRB5_PDU_NONE_DECL
450 return krb5_get_default_in_tkt_etypes(context, KRB5_PDU_NONE, enctypes);
451 #else
452 return krb5_get_default_in_tkt_etypes(context, enctypes);
453 #endif
454 }
455 #else
456 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
457 #endif
458
459
460 /**
461 * @brief Convert a string principal name to a Kerberos principal.
462 *
463 * @param[in] context The library context
464 *
465 * @param[in] name The principal as a unix charset string.
466 *
467 * @param[out] principal The newly allocated principal.
468 *
469 * Use krb5_free_principal() to free a principal when it is no longer needed.
470 *
471 * @return 0 on success, a Kerberos error code otherwise.
472 */
473 krb5_error_code smb_krb5_parse_name(krb5_context context,
474 const char *name,
475 krb5_principal *principal)
476 {
477 krb5_error_code ret;
478 char *utf8_name;
479 size_t converted_size;
480 TALLOC_CTX *frame = talloc_stackframe();
481
482 if (!push_utf8_talloc(frame, &utf8_name, name, &converted_size)) {
483 talloc_free(frame);
484 return ENOMEM;
485 }
486
487 ret = krb5_parse_name(context, utf8_name, principal);
488 TALLOC_FREE(frame);
489 return ret;
490 }
491
492 /**
493 * @brief Convert a Kerberos principal structure to a string representation.
494 *
495 * The resulting string representation will be a unix charset name and is
496 * talloc'ed.
497 *
498 * @param[in] mem_ctx The talloc context to allocate memory on.
499 *
500 * @param[in] context The library context.
501 *
502 * @param[in] principal The principal.
503 *
504 * @param[out] unix_name A string representation of the princpial name as with
505 * unix charset.
506 *
507 * Use talloc_free() to free the string representation if it is no longer
508 * needed.
509 *
510 * @return 0 on success, a Kerberos error code otherwise.
511 */
512 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
513 krb5_context context,
514 krb5_const_principal principal,
515 char **unix_name)
516 {
517 krb5_error_code ret;
518 char *utf8_name;
519 size_t converted_size;
520
521 *unix_name = NULL;
522 ret = krb5_unparse_name(context, principal, &utf8_name);
523 if (ret) {
524 return ret;
525 }
526
527 if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
528 krb5_free_unparsed_name(context, utf8_name);
529 return ENOMEM;
530 }
531 krb5_free_unparsed_name(context, utf8_name);
532 return 0;
533 }
534
535 /**
536 * @brief Free the contents of a krb5_data structure and zero the data field.
537 *
538 * @param[in] context The krb5 context
539 *
540 * @param[in] pdata The data structure to free contents of
541 *
542 * This function frees the contents, not the structure itself.
543 */
544 void smb_krb5_free_data_contents(krb5_context context, krb5_data *pdata)
545 {
546 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
547 if (pdata->data) {
548 krb5_free_data_contents(context, pdata);
549 }
550 #elif defined(HAVE_KRB5_DATA_FREE)
551 krb5_data_free(context, pdata);
552 #else
553 SAFE_FREE(pdata->data);
554 #endif
555 }
556
557 /*
558 * @brief copy a buffer into a krb5_data struct
559 *
560 * @param[in] p The krb5_data
561 * @param[in] data The data to copy
562 * @param[in] length The length of the data to copy
563 * @return krb5_error_code
564 *
565 * Caller has to free krb5_data with smb_krb5_free_data_contents().
566 */
567 krb5_error_code smb_krb5_copy_data_contents(krb5_data *p,
568 const void *data,
569 size_t len)
570 {
571 #if defined(HAVE_KRB5_DATA_COPY)
572 return krb5_data_copy(p, data, len);
573 #else
574 if (len) {
575 p->data = malloc(len);
576 if (p->data == NULL) {
577 return ENOMEM;
578 }
579 memmove(p->data, data, len);
580 } else {
581 p->data = NULL;
582 }
583 p->length = len;
584 p->magic = KV5M_DATA;
585 return 0;
586 #endif
587 }
588
589 bool smb_krb5_get_smb_session_key(TALLOC_CTX *mem_ctx,
590 krb5_context context,
591 krb5_auth_context auth_context,
592 DATA_BLOB *session_key,
593 bool remote)
594 {
595 krb5_keyblock *skey = NULL;
596 krb5_error_code err = 0;
597 bool ret = false;
598
599 if (remote) {
600 #ifdef HAVE_KRB5_AUTH_CON_GETRECVSUBKEY
601 err = krb5_auth_con_getrecvsubkey(context,
602 auth_context,
603 &skey);
604 #else /* HAVE_KRB5_AUTH_CON_GETRECVSUBKEY */
605 err = krb5_auth_con_getremotesubkey(context,
606 auth_context, &skey);
607 #endif /* HAVE_KRB5_AUTH_CON_GETRECVSUBKEY */
608 } else {
609 #ifdef HAVE_KRB5_AUTH_CON_GETSENDSUBKEY
610 err = krb5_auth_con_getsendsubkey(context,
611 auth_context,
612 &skey);
613 #else /* HAVE_KRB5_AUTH_CON_GETSENDSUBKEY */
614 err = krb5_auth_con_getlocalsubkey(context,
615 auth_context, &skey);
616 #endif /* HAVE_KRB5_AUTH_CON_GETSENDSUBKEY */
617 }
618
619 if (err || skey == NULL) {
620 DEBUG(10, ("KRB5 error getting session key %d\n", err));
621 goto done;
622 }
623
624 DEBUG(10, ("Got KRB5 session key of length %d\n",
625 (int)KRB5_KEY_LENGTH(skey)));
626
627 *session_key = data_blob_talloc(mem_ctx,
628 KRB5_KEY_DATA(skey),
629 KRB5_KEY_LENGTH(skey));
630 dump_data_pw("KRB5 Session Key:\n",
631 session_key->data,
632 session_key->length);
633
634 ret = true;
635
636 done:
637 if (skey) {
638 krb5_free_keyblock(context, skey);
639 }
640
641 return ret;
642 }
643
644
645 /**
646 * @brief Get talloced string component of a principal
647 *
648 * @param[in] mem_ctx The TALLOC_CTX
649 * @param[in] context The krb5_context
650 * @param[in] principal The principal
651 * @param[in] component The component
652 * @return string component
653 *
654 * Caller must talloc_free if the return value is not NULL.
655 *
656 */
657 char *smb_krb5_principal_get_comp_string(TALLOC_CTX *mem_ctx,
658 krb5_context context,
659 krb5_const_principal principal,
660 unsigned int component)
661 {
662 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING)
663 return talloc_strdup(mem_ctx, krb5_principal_get_comp_string(context, principal, component));
664 #else
665 krb5_data *data;
666
667 if (component >= krb5_princ_size(context, principal)) {
668 return NULL;
669 }
670
671 data = krb5_princ_component(context, principal, component);
672 if (data == NULL) {
673 return NULL;
674 }
675
676 return talloc_strndup(mem_ctx, data->data, data->length);
677 #endif
678 }
679
680 /**
681 * @brief
682 *
683 * @param[in] ccache_string A string pointing to the cache to renew the ticket
684 * (e.g. FILE:/tmp/krb5cc_0) or NULL. If the principal
685 * ccache has not been specified, the default ccache
686 * will be used.
687 *
688 * @param[in] client_string The client principal string (e.g. user@SAMBA.SITE)
689 * or NULL. If the principal string has not been
690 * specified, the principal from the ccache will be
691 * retrieved.
692 *
693 * @param[in] service_string The service ticket string
694 * (e.g. krbtgt/SAMBA.SITE@SAMBA.SITE) or NULL. If
695 * the sevice ticket is specified, it is parsed (
696 * with the realm part ignored) and used as the
697 * server principal of the credential. Otherwise
698 * the ticket-granting service is used.
699 *
700 * @param[in] expire_time A pointer to store the credentials end time or
701 * NULL.
702 *
703 * @return 0 on Succes, a Kerberos error code otherwise.
704 */
705 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,
706 const char *client_string,
707 const char *service_string,
708 time_t *expire_time)
709 {
710 krb5_error_code ret;
711 krb5_context context = NULL;
712 krb5_ccache ccache = NULL;
713 krb5_principal client = NULL;
714 krb5_creds creds, creds_in;
715
716 ZERO_STRUCT(creds);
717 ZERO_STRUCT(creds_in);
718
719 initialize_krb5_error_table();
720 ret = krb5_init_context(&context);
721 if (ret) {
722 goto done;
723 }
724
725 if (!ccache_string) {
726 ccache_string = krb5_cc_default_name(context);
727 }
728
729 if (!ccache_string) {
730 ret = EINVAL;
731 goto done;
732 }
733
734 DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
735
736 /* FIXME: we should not fall back to defaults */
737 ret = krb5_cc_resolve(context, discard_const_p(char, ccache_string), &ccache);
738 if (ret) {
739 goto done;
740 }
741
742 if (client_string) {
743 ret = smb_krb5_parse_name(context, client_string, &client);
744 if (ret) {
745 goto done;
746 }
747 } else {
748 ret = krb5_cc_get_principal(context, ccache, &client);
749 if (ret) {
750 goto done;
751 }
752 }
753
754 ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string));
755 if (ret) {
756 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
757 goto done;
758 }
759
760 /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
761 ret = krb5_cc_initialize(context, ccache, client);
762 if (ret) {
763 goto done;
764 }
765
766 ret = krb5_cc_store_cred(context, ccache, &creds);
767
768 if (expire_time) {
769 *expire_time = (time_t) creds.times.endtime;
770 }
771
772 done:
773 krb5_free_cred_contents(context, &creds_in);
774 krb5_free_cred_contents(context, &creds);
775
776 if (client) {
777 krb5_free_principal(context, client);
778 }
779 if (ccache) {
780 krb5_cc_close(context, ccache);
781 }
782 if (context) {
783 krb5_free_context(context);
784 }
785
786 return ret;
787 }
788
789 /**
790 * @brief Free the data stored in an smb_krb5_addresses structure.
791 *
792 * @param[in] context The library context
793 *
794 * @param[in] addr The address structure to free.
795 *
796 * @return 0 on success, a Kerberos error code otherwise.
797 */
798 krb5_error_code smb_krb5_free_addresses(krb5_context context,
799 smb_krb5_addresses *addr)
800 {
801 krb5_error_code ret = 0;
802 if (addr == NULL) {
803 return ret;
804 }
805 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
806 krb5_free_addresses(context, addr->addrs);
807 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
808 ret = krb5_free_addresses(context, addr->addrs);
809 SAFE_FREE(addr->addrs);
810 #endif
811 SAFE_FREE(addr);
812 addr = NULL;
813 return ret;
814 }
815
816 #define MAX_NETBIOSNAME_LEN 16
817
818 /**
819 * @brief Add a netbios name to the array of addresses
820 *
821 * @param[in] kerb_addr A pointer to the smb_krb5_addresses to add the
822 * netbios name to.
823 *
824 * @param[in] netbios_name The netbios name to add.
825 *
826 * @return 0 on success, a Kerberos error code otherwise.
827 */
828 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr,
829 const char *netbios_name)
830 {
831 krb5_error_code ret = 0;
832 char buf[MAX_NETBIOSNAME_LEN];
833 int len;
834 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
835 krb5_address **addrs = NULL;
836 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
837 krb5_addresses *addrs = NULL;
838 #endif
839
840 *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
841 if (*kerb_addr == NULL) {
842 return ENOMEM;
843 }
844
845 /* temporarily duplicate put_name() code here to avoid dependency
846 * issues for a 5 lines function */
847 len = strlen(netbios_name);
848 memcpy(buf, netbios_name,
849 (len < MAX_NETBIOSNAME_LEN) ? len : MAX_NETBIOSNAME_LEN - 1);
850 if (len < MAX_NETBIOSNAME_LEN - 1) {
851 memset(buf + len, ' ', MAX_NETBIOSNAME_LEN - 1 - len);
852 }
853 buf[MAX_NETBIOSNAME_LEN - 1] = 0x20;
854
855 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
856 {
857 int num_addr = 2;
858
859 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
860 if (addrs == NULL) {
861 SAFE_FREE(*kerb_addr);
862 return ENOMEM;
863 }
864
865 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
866
867 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
868 if (addrs[0] == NULL) {
869 SAFE_FREE(addrs);
870 SAFE_FREE(*kerb_addr);
871 return ENOMEM;
872 }
873
874 addrs[0]->magic = KV5M_ADDRESS;
875 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
876 addrs[0]->length = MAX_NETBIOSNAME_LEN;
877 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
878 if (addrs[0]->contents == NULL) {
879 SAFE_FREE(addrs[0]);
880 SAFE_FREE(addrs);
881 SAFE_FREE(*kerb_addr);
882 return ENOMEM;
883 }
884
885 memcpy(addrs[0]->contents, buf, addrs[0]->length);
886
887 addrs[1] = NULL;
888 }
889 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
890 {
891 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
892 if (addrs == NULL) {
893 SAFE_FREE(*kerb_addr);
894 return ENOMEM;
895 }
896
897 memset(addrs, 0, sizeof(krb5_addresses));
898
899 addrs->len = 1;
900 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
901 if (addrs->val == NULL) {
902 SAFE_FREE(addrs);
903 SAFE_FREE(kerb_addr);
904 return ENOMEM;
905 }
906
907 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
908 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
909 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
910 if (addrs->val[0].address.data == NULL) {
911 SAFE_FREE(addrs->val);
912 SAFE_FREE(addrs);
913 SAFE_FREE(*kerb_addr);
914 return ENOMEM;
915 }
916
917 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
918 }
919 #else
920 #error UNKNOWN_KRB5_ADDRESS_FORMAT
921 #endif
922 (*kerb_addr)->addrs = addrs;
923
924 return ret;
925 }
926
927 /**
928 * @brief Get the enctype from a key table entry
929 *
930 * @param[in] kt_entry Key table entry to get the enctype from.
931 *
932 * @return The enctype from the entry.
933 */
934 krb5_enctype smb_krb5_kt_get_enctype_from_entry(krb5_keytab_entry *kt_entry)
935 {
936 return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
937 }
938
939 /**
940 * @brief Free the contents of a key table entry.
941 *
942 * @param[in] context The library context.
943 *
944 * @param[in] kt_entry The key table entry to free the contents of.
945 *
946 * @return 0 on success, a Kerberos error code otherwise.
947 *
948 * The pointer itself is not freed.
949 */
950 krb5_error_code smb_krb5_kt_free_entry(krb5_context context,
951 krb5_keytab_entry *kt_entry)
952 {
953 /* Try krb5_free_keytab_entry_contents first, since
954 * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
955 * krb5_kt_free_entry but only has a prototype for the first, while the
956 * second is considered private.
957 */
958 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
959 return krb5_free_keytab_entry_contents(context, kt_entry);
960 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
961 return krb5_kt_free_entry(context, kt_entry);
962 #else
963 #error UNKNOWN_KT_FREE_FUNCTION
964 #endif
965 }
966
967
968 /**
969 * @brief Convert an encryption type to a string.
970 *
971 * @param[in] context The library context.
972 *
973 * @param[in] enctype The encryption type.
974 *
975 * @param[in] etype_s A pointer to store the allocated encryption type as a
976 * string.
977 *
978 * @return 0 on success, a Kerberos error code otherwise.
979 *
980 * The caller needs to free the allocated string etype_s.
981 */
982 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
983 krb5_enctype enctype,
984 char **etype_s)
985 {
986 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
987 return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
988 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
989 char buf[256];
990 krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
991 if (ret) {
992 return ret;
993 }
994 *etype_s = SMB_STRDUP(buf);
995 if (!*etype_s) {
996 return ENOMEM;
997 }
998 return ret;
999 #else
1000 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1001 #endif
1002 }
1003
1004 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1005 #ifndef MAX_KEYTAB_NAME_LEN
1006 #define MAX_KEYTAB_NAME_LEN 1100
1007 #endif
1008
1009 /**
1010 * @brief Open a key table readonly or with readwrite access.
1011 *
1012 * Allows to use a different keytab than the default one using a relative
1013 * path to the keytab.
1014 *
1015 * @param[in] context The library context
1016 *
1017 * @param[in] keytab_name_req The path to the key table.
1018 *
1019 * @param[in] write_access Open with readwrite access.
1020 *
1021 * @param[in] keytab A pointer o the opended key table.
1022 *
1023 * The keytab pointer should be freed using krb5_kt_close().
1024 *
1025 * @return 0 on success, a Kerberos error code otherwise.
1026 */
1027 krb5_error_code smb_krb5_kt_open_relative(krb5_context context,
1028 const char *keytab_name_req,
1029 bool write_access,
1030 krb5_keytab *keytab)
1031 {
1032 krb5_error_code ret = 0;
1033 TALLOC_CTX *mem_ctx;
1034 char keytab_string[MAX_KEYTAB_NAME_LEN];
1035 char *kt_str = NULL;
1036 bool found_valid_name = false;
1037 const char *pragma = "FILE";
1038 const char *tmp = NULL;
1039
1040 if (!write_access && !keytab_name_req) {
1041 /* caller just wants to read the default keytab readonly, so be it */
1042 return krb5_kt_default(context, keytab);
1043 }
1044
1045 mem_ctx = talloc_init("smb_krb5_open_keytab");
1046 if (!mem_ctx) {
1047 return ENOMEM;
1048 }
1049
1050 #ifdef HAVE_WRFILE_KEYTAB
1051 if (write_access) {
1052 pragma = "WRFILE";
1053 }
1054 #endif
1055
1056 if (keytab_name_req) {
1057
1058 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1059 ret = KRB5_CONFIG_NOTENUFSPACE;
1060 goto out;
1061 }
1062
1063 if ((strncmp(keytab_name_req, "WRFILE:", 7) == 0) ||
1064 (strncmp(keytab_name_req, "FILE:", 5) == 0)) {
1065 tmp = keytab_name_req;
1066 goto resolve;
1067 }
1068
1069 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1070 if (!tmp) {
1071 ret = ENOMEM;
1072 goto out;
1073 }
1074
1075 goto resolve;
1076 }
1077
1078 /* we need to handle more complex keytab_strings, like:
1079 * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1080
1081 ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1082 if (ret) {
1083 goto out;
1084 }
1085
1086 DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1087
1088 tmp = talloc_strdup(mem_ctx, keytab_string);
1089 if (!tmp) {
1090 ret = ENOMEM;
1091 goto out;
1092 }
1093
1094 if (strncmp(tmp, "ANY:", 4) == 0) {
1095 tmp += 4;
1096 }
1097
1098 memset(&keytab_string, '\0', sizeof(keytab_string));
1099
1100 while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1101 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1102 found_valid_name = true;
1103 tmp = kt_str;
1104 tmp += 7;
1105 }
1106
1107 if (strncmp(kt_str, "FILE:", 5) == 0) {
1108 found_valid_name = true;
1109 tmp = kt_str;
1110 tmp += 5;
1111 }
1112
1113 if (tmp[0] == '/') {
1114 /* Treat as a FILE: keytab definition. */
1115 found_valid_name = true;
1116 }
1117
1118 if (found_valid_name) {
1119 if (tmp[0] != '/') {
1120 ret = KRB5_KT_BADNAME;
1121 goto out;
1122 }
1123
1124 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1125 if (!tmp) {
1126 ret = ENOMEM;
1127 goto out;
1128 }
1129 break;
1130 }
1131 }
1132
1133 if (!found_valid_name) {
1134 ret = KRB5_KT_UNKNOWN_TYPE;
1135 goto out;
1136 }
1137
1138 resolve:
1139 DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1140 ret = krb5_kt_resolve(context, tmp, keytab);
1141
1142 out:
1143 TALLOC_FREE(mem_ctx);
1144 return ret;
1145 }
1146
1147 /**
1148 * @brief Open a key table readonly or with readwrite access.
1149 *
1150 * Allows to use a different keytab than the default one. The path needs to be
1151 * an absolute path or an error will be returned.
1152 *
1153 * @param[in] context The library context
1154 *
1155 * @param[in] keytab_name_req The path to the key table.
1156 *
1157 * @param[in] write_access Open with readwrite access.
1158 *
1159 * @param[in] keytab A pointer o the opended key table.
1160 *
1161 * The keytab pointer should be freed using krb5_kt_close().
1162 *
1163 * @return 0 on success, a Kerberos error code otherwise.
1164 */
1165 krb5_error_code smb_krb5_kt_open(krb5_context context,
1166 const char *keytab_name_req,
1167 bool write_access,
1168 krb5_keytab *keytab)
1169 {
1170 int cmp;
1171
1172 if (keytab_name_req == NULL) {
1173 return KRB5_KT_BADNAME;
1174 }
1175
1176 if (keytab_name_req[0] == '/') {
1177 goto open_keytab;
1178 }
1179
1180 cmp = strncmp(keytab_name_req, "FILE:/", 6);
1181 if (cmp == 0) {
1182 goto open_keytab;
1183 }
1184
1185 cmp = strncmp(keytab_name_req, "WRFILE:/", 8);
1186 if (cmp == 0) {
1187 goto open_keytab;
1188 }
1189
1190 DBG_WARNING("ERROR: Invalid keytab name: %s\n", keytab_name_req);
1191
1192 return KRB5_KT_BADNAME;
1193
1194 open_keytab:
1195 return smb_krb5_kt_open_relative(context,
1196 keytab_name_req,
1197 write_access,
1198 keytab);
1199 }
1200
1201 /**
1202 * @brief Get a key table name.
1203 *
1204 * @param[in] mem_ctx The talloc context to use for allocation.
1205 *
1206 * @param[in] context The library context.
1207 *
1208 * @param[in] keytab The key table to get the name from.
1209 *
1210 * @param[in] keytab_name A talloc'ed string of the key table name.
1211 *
1212 * The talloc'ed name string needs to be freed with talloc_free().
1213 *
1214 * @return 0 on success, a Kerberos error code otherwise.
1215 */
1216 krb5_error_code smb_krb5_kt_get_name(TALLOC_CTX *mem_ctx,
1217 krb5_context context,
1218 krb5_keytab keytab,
1219 const char **keytab_name)
1220 {
1221 char keytab_string[MAX_KEYTAB_NAME_LEN];
1222 krb5_error_code ret = 0;
1223
1224 ret = krb5_kt_get_name(context, keytab,
1225 keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1226 if (ret) {
1227 return ret;
1228 }
1229
1230 *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1231 if (!*keytab_name) {
1232 return ENOMEM;
1233 }
1234
1235 return ret;
1236 }
1237
1238 /**
1239 * @brief Seek and delete old entries in a keytab based on the passed
1240 * principal.
1241 *
1242 * @param[in] context The KRB5 context to use.
1243 *
1244 * @param[in] keytab The keytab to operate on.
1245 *
1246 * @param[in] kvno The kvnco to use.
1247 *
1248 * @param[in] princ_s The principal as a string to search for.
1249 *
1250 * @param[in] princ The principal as a krb5_principal to search for.
1251 *
1252 * @param[in] flush Weather to flush the complete keytab.
1253 *
1254 * @param[in] keep_old_entries Keep the entry with the previous kvno.
1255 *
1256 * @retval 0 on Sucess
1257 *
1258 * @return An appropriate KRB5 error code.
1259 */
1260 krb5_error_code smb_krb5_kt_seek_and_delete_old_entries(krb5_context context,
1261 krb5_keytab keytab,
1262 krb5_kvno kvno,
1263 krb5_enctype enctype,
1264 const char *princ_s,
1265 krb5_principal princ,
1266 bool flush,
1267 bool keep_old_entries)
1268 {
1269 krb5_error_code ret;
1270 krb5_kt_cursor cursor;
1271 krb5_keytab_entry kt_entry;
1272 char *ktprinc = NULL;
1273 krb5_kvno old_kvno = kvno - 1;
1274 TALLOC_CTX *tmp_ctx;
1275
1276 ZERO_STRUCT(cursor);
1277 ZERO_STRUCT(kt_entry);
1278
1279 ret = krb5_kt_start_seq_get(context, keytab, &cursor);
1280 if (ret == KRB5_KT_END || ret == ENOENT ) {
1281 /* no entries */
1282 return 0;
1283 }
1284
1285 tmp_ctx = talloc_new(NULL);
1286 if (tmp_ctx == NULL) {
1287 return ENOMEM;
1288 }
1289
1290 DEBUG(3, (__location__ ": Will try to delete old keytab entries\n"));
1291 while (!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) {
1292 bool name_ok = false;
1293 krb5_enctype kt_entry_enctype =
1294 smb_krb5_kt_get_enctype_from_entry(&kt_entry);
1295
1296 if (!flush && (princ_s != NULL)) {
1297 ret = smb_krb5_unparse_name(tmp_ctx, context,
1298 kt_entry.principal,
1299 &ktprinc);
1300 if (ret) {
1301 DEBUG(1, (__location__
1302 ": smb_krb5_unparse_name failed "
1303 "(%s)\n", error_message(ret)));
1304 goto out;
1305 }
1306
1307 #ifdef HAVE_KRB5_KT_COMPARE
1308 name_ok = krb5_kt_compare(context, &kt_entry,
1309 princ, 0, 0);
1310 #else
1311 name_ok = (strcmp(ktprinc, princ_s) == 0);
1312 #endif
1313
1314 if (!name_ok) {
1315 DEBUG(10, (__location__ ": ignoring keytab "
1316 "entry principal %s, kvno = %d\n",
1317 ktprinc, kt_entry.vno));
1318
1319 /* Not a match,
1320 * just free this entry and continue. */
1321 ret = smb_krb5_kt_free_entry(context,
1322 &kt_entry);
1323 ZERO_STRUCT(kt_entry);
1324 if (ret) {
1325 DEBUG(1, (__location__
1326 ": smb_krb5_kt_free_entry "
1327 "failed (%s)\n",
1328 error_message(ret)));
1329 goto out;
1330 }
1331
1332 TALLOC_FREE(ktprinc);
1333 continue;
1334 }
1335
1336 TALLOC_FREE(ktprinc);
1337 }
1338
1339 /*------------------------------------------------------------
1340 * Save the entries with kvno - 1. This is what microsoft does
1341 * to allow people with existing sessions that have kvno - 1
1342 * to still work. Otherwise, when the password for the machine
1343 * changes, all kerberizied sessions will 'break' until either
1344 * the client reboots or the client's session key expires and
1345 * they get a new session ticket with the new kvno.
1346 * Some keytab files only store the kvno in 8bits, limit
1347 * the compare accordingly.
1348 */
1349
1350 if (!flush && ((kt_entry.vno & 0xff) == (old_kvno & 0xff))) {
1351 DEBUG(5, (__location__ ": Saving previous (kvno %d) "
1352 "entry for principal: %s.\n",
1353 old_kvno, princ_s));
1354 continue;
1355 }
1356
1357 if (keep_old_entries) {
1358 DEBUG(5, (__location__ ": Saving old (kvno %d) "
1359 "entry for principal: %s.\n",
1360 kvno, princ_s));
1361 continue;
1362 }
1363
1364 if (!flush &&
1365 (kt_entry.vno == kvno) &&
1366 (kt_entry_enctype != enctype))
1367 {
1368 DEBUG(5, (__location__ ": Saving entry with kvno [%d] "
1369 "enctype [%d] for principal: %s.\n",
1370 kvno, kt_entry_enctype, princ_s));
1371 continue;
1372 }
1373
1374 DEBUG(5, (__location__ ": Found old entry for principal: %s "
1375 "(kvno %d) - trying to remove it.\n",
1376 princ_s, kt_entry.vno));
1377
1378 ret = krb5_kt_end_seq_get(context, keytab, &cursor);
1379 ZERO_STRUCT(cursor);
1380 if (ret) {
1381 DEBUG(1, (__location__ ": krb5_kt_end_seq_get() "
1382 "failed (%s)\n", error_message(ret)));
1383 goto out;
1384 }
1385 ret = krb5_kt_remove_entry(context, keytab, &kt_entry);
1386 if (ret) {
1387 DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
1388 "failed (%s)\n", error_message(ret)));
1389 goto out;
1390 }
1391
1392 DEBUG(5, (__location__ ": removed old entry for principal: "
1393 "%s (kvno %d).\n", princ_s, kt_entry.vno));
1394
1395 ret = krb5_kt_start_seq_get(context, keytab, &cursor);
1396 if (ret) {
1397 DEBUG(1, (__location__ ": krb5_kt_start_seq() failed "
1398 "(%s)\n", error_message(ret)));
1399 goto out;
1400 }
1401 ret = smb_krb5_kt_free_entry(context, &kt_entry);
1402 ZERO_STRUCT(kt_entry);
1403 if (ret) {
1404 DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
1405 "failed (%s)\n", error_message(ret)));
1406 goto out;
1407 }
1408 }
1409
1410 out:
1411 talloc_free(tmp_ctx);
1412 if (!all_zero((uint8_t *)&kt_entry, sizeof(kt_entry))) {
1413 smb_krb5_kt_free_entry(context, &kt_entry);
1414 }
1415 if (!all_zero((uint8_t *)&cursor, sizeof(cursor))) {
1416 krb5_kt_end_seq_get(context, keytab, &cursor);
1417 }
1418 return ret;
1419 }
1420
1421 /**
1422 * @brief Add a keytab entry for the given principal
1423 *
1424 * @param[in] context The krb5 context to use.
1425 *
1426 * @param[in] keytab The keytab to add the entry to.
1427 *
1428 * @param[in] kvno The kvno to use.
1429 *
1430 * @param[in] princ_s The principal as a string.
1431 *
1432 * @param[in] salt_principal The salt principal to salt the password with.
1433 * Only needed for keys which support salting.
1434 * If no salt is used set no_salt to false and
1435 * pass NULL here.
1436 *
1437 * @param[in] enctype The encryption type of the keytab entry.
1438 *
1439 * @param[in] password The password of the keytab entry.
1440 *
1441 * @param[in] no_salt If the password should not be salted. Normally
1442 * this is only set to false for encryption types
1443 * which do not support salting like RC4.
1444 *
1445 * @param[in] keep_old_entries Wether to keep or delte old keytab entries.
1446 *
1447 * @retval 0 on Success
1448 *
1449 * @return A corresponding KRB5 error code.
1450 *
1451 * @see smb_krb5_kt_open()
1452 */
1453 krb5_error_code smb_krb5_kt_add_entry(krb5_context context,
1454 krb5_keytab keytab,
1455 krb5_kvno kvno,
1456 const char *princ_s,
1457 const char *salt_principal,
1458 krb5_enctype enctype,
1459 krb5_data *password,
1460 bool no_salt,
1461 bool keep_old_entries)
1462 {
1463 krb5_error_code ret;
1464 krb5_keytab_entry kt_entry;
1465 krb5_principal princ = NULL;
1466 krb5_keyblock *keyp;
1467
1468 ZERO_STRUCT(kt_entry);
1469
1470 ret = smb_krb5_parse_name(context, princ_s, &princ);
1471 if (ret) {
1472 DEBUG(1, (__location__ ": smb_krb5_parse_name(%s) "
1473 "failed (%s)\n", princ_s, error_message(ret)));
1474 goto out;
1475 }
1476
1477 /* Seek and delete old keytab entries */
1478 ret = smb_krb5_kt_seek_and_delete_old_entries(context,
1479 keytab,
1480 kvno,
1481 enctype,
1482 princ_s,
1483 princ,
1484 false,
1485 keep_old_entries);
1486 if (ret) {
1487 goto out;
1488 }
1489
1490 /* If we get here, we have deleted all the old entries with kvno's
1491 * not equal to the current kvno-1. */
1492
1493 keyp = KRB5_KT_KEY(&kt_entry);
1494
1495 if (no_salt) {
1496 KRB5_KEY_DATA(keyp) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
1497 if (KRB5_KEY_DATA(keyp) == NULL) {
1498 ret = ENOMEM;
1499 goto out;
1500 }
1501 memcpy(KRB5_KEY_DATA(keyp), password->data, password->length);
1502 KRB5_KEY_LENGTH(keyp) = password->length;
1503 KRB5_KEY_TYPE(keyp) = enctype;
1504 } else {
1505 krb5_principal salt_princ = NULL;
1506
1507 /* Now add keytab entries for all encryption types */
1508 ret = smb_krb5_parse_name(context, salt_principal, &salt_princ);
1509 if (ret) {
1510 DBG_WARNING("krb5_parse_name(%s) failed (%s)\n",
1511 salt_principal, error_message(ret));
1512 goto out;
1513 }
1514
1515 ret = smb_krb5_create_key_from_string(context,
1516 salt_princ,
1517 NULL,
1518 password,
1519 enctype,
1520 keyp);
1521 krb5_free_principal(context, salt_princ);
1522 if (ret != 0) {
1523 goto out;
1524 }
1525 }
1526
1527 kt_entry.principal = princ;
1528 kt_entry.vno = kvno;
1529
1530 DEBUG(3, (__location__ ": adding keytab entry for (%s) with "
1531 "encryption type (%d) and version (%d)\n",
1532 princ_s, enctype, kt_entry.vno));
1533 ret = krb5_kt_add_entry(context, keytab, &kt_entry);
1534 krb5_free_keyblock_contents(context, keyp);
1535 ZERO_STRUCT(kt_entry);
1536 if (ret) {
1537 DEBUG(1, (__location__ ": adding entry to keytab "
1538 "failed (%s)\n", error_message(ret)));
1539 goto out;
1540 }
1541
1542 out:
1543 if (princ) {
1544 krb5_free_principal(context, princ);
1545 }
1546
1547 return ret;
1548 }
1549
1550 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1551 defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1552 defined(HAVE_KRB5_GET_CREDS)
1553 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1554 krb5_ccache ccache,
1555 krb5_principal me,
1556 krb5_principal server,
1557 krb5_principal impersonate_princ,
1558 krb5_creds **out_creds)
1559 {
1560 krb5_error_code ret;
1561 krb5_get_creds_opt opt;
1562
1563 ret = krb5_get_creds_opt_alloc(context, &opt);
1564 if (ret) {
1565 goto done;
1566 }
1567 krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1568
1569 if (impersonate_princ) {
1570 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1571 impersonate_princ);
1572 if (ret) {
1573 goto done;
1574 }
1575 }
1576
1577 ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1578 if (ret) {
1579 goto done;
1580 }
1581
1582 done:
1583 if (opt) {
1584 krb5_get_creds_opt_free(context, opt);
1585 }
1586 return ret;
1587 }
1588 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1589
1590 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1591
1592 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1593 krb5_error_code KRB5_CALLCONV
1594 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1595 krb5_ccache ccache, krb5_creds *in_creds,
1596 krb5_data *subject_cert,
1597 krb5_creds **out_creds);
1598 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1599
1600 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1601 krb5_ccache ccache,
1602 krb5_principal me,
1603 krb5_principal server,
1604 krb5_principal impersonate_princ,
1605 krb5_creds **out_creds)
1606 {
1607 krb5_error_code ret;
1608 krb5_creds in_creds;
1609
1610 ZERO_STRUCT(in_creds);
1611
1612 if (impersonate_princ) {
1613
1614 in_creds.server = me;
1615 in_creds.client = impersonate_princ;
1616
1617 ret = krb5_get_credentials_for_user(context,
1618 0, /* krb5_flags options */
1619 ccache,
1620 &in_creds,
1621 NULL, /* krb5_data *subject_cert */
1622 out_creds);
1623 } else {
1624 in_creds.client = me;
1625 in_creds.server = server;
1626
1627 ret = krb5_get_credentials(context, 0, ccache,
1628 &in_creds, out_creds);
1629 }
1630
1631 return ret;
1632 }
1633 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1634
1635 /*
1636 * smb_krb5_get_credentials
1637 *
1638 * @brief Get krb5 credentials for a server
1639 *
1640 * @param[in] context An initialized krb5_context
1641 * @param[in] ccache An initialized krb5_ccache
1642 * @param[in] me The krb5_principal of the caller
1643 * @param[in] server The krb5_principal of the requested service
1644 * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1645 * @param[out] out_creds The returned krb5_creds structure
1646 * @return krb5_error_code
1647 *
1648 */
1649 krb5_error_code smb_krb5_get_credentials(krb5_context context,
1650 krb5_ccache ccache,
1651 krb5_principal me,
1652 krb5_principal server,
1653 krb5_principal impersonate_princ,
1654 krb5_creds **out_creds)
1655 {
1656 krb5_error_code ret;
1657 krb5_creds *creds = NULL;
1658
1659 if (out_creds != NULL) {
1660 *out_creds = NULL;
1661 }
1662
1663 if (impersonate_princ) {
1664 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
1665 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
1666 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
1667 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
1668 #else
1669 ret = ENOTSUP;
1670 #endif
1671 } else {
1672 krb5_creds in_creds;
1673
1674 ZERO_STRUCT(in_creds);
1675
1676 in_creds.client = me;
1677 in_creds.server = server;
1678
1679 ret = krb5_get_credentials(context, 0, ccache,
1680 &in_creds, &creds);
1681 }
1682 if (ret) {
1683 goto done;
1684 }
1685
1686 if (out_creds) {
1687 *out_creds = creds;
1688 }
1689
1690 done:
1691 if (creds && ret) {
1692 krb5_free_creds(context, creds);
1693 }
1694
1695 return ret;
1696 }
1697
1698 /**
1699 * @brief Initialize a krb5_keyblock with the given data.
1700 *
1701 * Initialized a new keyblock, allocates the contents fo the key and
1702 * copies the data into the keyblock.
1703 *
1704 * @param[in] context The library context
1705 *
1706 * @param[in] enctype The encryption type.
1707 *
1708 * @param[in] data The date to initialize the keyblock with.
1709 *
1710 * @param[in] length The length of the keyblock.
1711 *
1712 * @param[in] key Newly allocated keyblock structure.
1713 *
1714 * The key date must be freed using krb5_free_keyblock_contents() when it is
1715 * no longer needed.
1716 *
1717 * @return 0 on success, a Kerberos error code otherwise.
1718 */
1719 krb5_error_code smb_krb5_keyblock_init_contents(krb5_context context,
1720 krb5_enctype enctype,
1721 const void *data,
1722 size_t length,
1723 krb5_keyblock *key)
1724 {
1725 #if defined(HAVE_KRB5_KEYBLOCK_INIT)
1726 return krb5_keyblock_init(context, enctype, data, length, key);
1727 #else
1728 memset(key, 0, sizeof(krb5_keyblock));
1729 KRB5_KEY_DATA(key) = SMB_MALLOC(length);
1730 if (NULL == KRB5_KEY_DATA(key)) {
1731 return ENOMEM;
1732 }
1733 memcpy(KRB5_KEY_DATA(key), data, length);
1734 KRB5_KEY_LENGTH(key) = length;
1735 KRB5_KEY_TYPE(key) = enctype;
1736 return 0;
1737 #endif
1738 }
1739
1740 /**
1741 * @brief Simulate a kinit by putting the tgt in the given credential cache.
1742 *
1743 * This function uses a keyblock rather than needingthe original password.
1744 *
1745 * @param[in] ctx The library context
1746 *
1747 * @param[in] cc The credential cache to put the tgt in.
1748 *
1749 * @param[in] principal The client princial
1750 *
1751 * @param[in] keyblock The keyblock to use.
1752 *
1753 * @param[in] target_service The service name of the initial credentials (or NULL).
1754 *
1755 * @param[in] krb_options Initial credential options.
1756 *
1757 * @param[in] expire_time A pointer to store the experation time of the
1758 * credentials (or NULL).
1759 *
1760 * @param[in] kdc_time A pointer to store the time when the ticket becomes
1761 * valid (or NULL).
1762 *
1763 * @return 0 on success, a Kerberos error code otherwise.
1764 */
1765 krb5_error_code smb_krb5_kinit_keyblock_ccache(krb5_context ctx,
1766 krb5_ccache cc,
1767 krb5_principal principal,
1768 krb5_keyblock *keyblock,
1769 const char *target_service,
1770 krb5_get_init_creds_opt *krb_options,
1771 time_t *expire_time,
1772 time_t *kdc_time)
1773 {
1774 krb5_error_code code = 0;
1775 krb5_creds my_creds;
1776
1777 #if defined(HAVE_KRB5_GET_INIT_CREDS_KEYBLOCK)
1778 code = krb5_get_init_creds_keyblock(ctx, &my_creds, principal,
1779 keyblock, 0, target_service,
1780 krb_options);
1781 #elif defined(HAVE_KRB5_GET_INIT_CREDS_KEYTAB)
1782 {
1783 #define SMB_CREDS_KEYTAB "MEMORY:tmp_smb_creds_XXXXXX"
1784 char tmp_name[sizeof(SMB_CREDS_KEYTAB)];
1785 krb5_keytab_entry entry;
1786 krb5_keytab keytab;
1787 mode_t mask;
1788
1789 memset(&entry, 0, sizeof(entry));
1790 entry.principal = principal;
1791 *(KRB5_KT_KEY(&entry)) = *keyblock;
1792
1793 memcpy(tmp_name, SMB_CREDS_KEYTAB, sizeof(SMB_CREDS_KEYTAB));
1794 mask = umask(S_IRWXO | S_IRWXG);
1795 mktemp(tmp_name);
1796 umask(mask);
1797 if (tmp_name[0] == 0) {
1798 return KRB5_KT_BADNAME;
1799 }
1800 code = krb5_kt_resolve(ctx, tmp_name, &keytab);
1801 if (code) {
1802 return code;
1803 }
1804
1805 code = krb5_kt_add_entry(ctx, keytab, &entry);
1806 if (code) {
1807 (void)krb5_kt_close(ctx, keytab);
1808 goto done;
1809 }
1810
1811 code = krb5_get_init_creds_keytab(ctx, &my_creds, principal,
1812 keytab, 0, target_service,
1813 krb_options);
1814 (void)krb5_kt_close(ctx, keytab);
1815 }
1816 #else
1817 #error krb5_get_init_creds_keyblock not available!
1818 #endif
1819 if (code) {
1820 return code;
1821 }
1822
1823 #ifndef SAMBA4_USES_HEIMDAL /* MIT */
1824 /*
1825 * We need to store the principal as returned from the KDC to the
1826 * credentials cache. If we don't do that the KRB5 library is not
1827 * able to find the tickets it is looking for
1828 */
1829 principal = my_creds.client;
1830 #endif
1831 code = krb5_cc_initialize(ctx, cc, principal);
1832 if (code) {
1833 goto done;
1834 }
1835
1836 code = krb5_cc_store_cred(ctx, cc, &my_creds);
1837 if (code) {
1838 goto done;
1839 }
1840
1841 if (expire_time) {
1842 *expire_time = (time_t) my_creds.times.endtime;
1843 }
1844
1845 if (kdc_time) {
1846 *kdc_time = (time_t) my_creds.times.starttime;
1847 }
1848
1849 code = 0;
1850 done:
1851 krb5_free_cred_contents(ctx, &my_creds);
1852 return code;
1853 }
1854
1855 /**
1856 * @brief Simulate a kinit by putting the tgt in the given credential cache.
1857 *
1858 * @param[in] ctx The library context
1859 *
1860 * @param[in] cc The credential cache to put the tgt in.
1861 *
1862 * @param[in] principal The client princial
1863 *
1864 * @param[in] password The password (or NULL).
1865 *
1866 * @param[in] target_service The service name of the initial credentials (or NULL).
1867 *
1868 * @param[in] krb_options Initial credential options.
1869 *
1870 * @param[in] expire_time A pointer to store the experation time of the
1871 * credentials (or NULL).
1872 *
1873 * @param[in] kdc_time A pointer to store the time when the ticket becomes
1874 * valid (or NULL).
1875 *
1876 * @return 0 on success, a Kerberos error code otherwise.
1877 */
1878 krb5_error_code smb_krb5_kinit_password_ccache(krb5_context ctx,
1879 krb5_ccache cc,
1880 krb5_principal principal,
1881 const char *password,
1882 const char *target_service,
1883 krb5_get_init_creds_opt *krb_options,
1884 time_t *expire_time,
1885 time_t *kdc_time)
1886 {
1887 krb5_error_code code = 0;
1888 krb5_creds my_creds;
1889
1890 code = krb5_get_init_creds_password(ctx, &my_creds, principal,
1891 password, NULL, NULL, 0,
1892 target_service, krb_options);
1893 if (code) {
1894 return code;
1895 }
1896
1897 #ifndef SAMBA4_USES_HEIMDAL /* MIT */
1898 /*
1899 * We need to store the principal as returned from the KDC to the
1900 * credentials cache. If we don't do that the KRB5 library is not
1901 * able to find the tickets it is looking for
1902 */
1903 principal = my_creds.client;
1904 #endif
1905 code = krb5_cc_initialize(ctx, cc, principal);
1906 if (code) {
1907 goto done;
1908 }
1909
1910 code = krb5_cc_store_cred(ctx, cc, &my_creds);
1911 if (code) {
1912 goto done;
1913 }
1914
1915 if (expire_time) {
1916 *expire_time = (time_t) my_creds.times.endtime;
1917 }
1918
1919 if (kdc_time) {
1920 *kdc_time = (time_t) my_creds.times.starttime;
1921 }
1922
1923 code = 0;
1924 done:
1925 krb5_free_cred_contents(ctx, &my_creds);
1926 return code;
1927 }
1928
1929 #ifdef SAMBA4_USES_HEIMDAL
1930 /**
1931 * @brief Simulate a kinit by putting the tgt in the given credential cache.
1932 *
1933 * @param[in] ctx The library context
1934 *
1935 * @param[in] cc The credential cache to store the tgt in.
1936 *
1937 * @param[in] principal The initial client princial.
1938 *
1939 * @param[in] password The password (or NULL).
1940 *
1941 * @param[in] impersonate_principal The impersonatiion principal (or NULL).
1942 *
1943 * @param[in] self_service The local service for S4U2Self if
1944 * impersonate_principal is specified).
1945 *
1946 * @param[in] target_service The service name of the initial credentials
1947 * (kpasswd/REALM or a remote service). It defaults
1948 * to the krbtgt if NULL.
1949 *
1950 * @param[in] krb_options Initial credential options.
1951 *
1952 * @param[in] expire_time A pointer to store the experation time of the
1953 * credentials (or NULL).
1954 *
1955 * @param[in] kdc_time A pointer to store the time when the ticket becomes
1956 * valid (or NULL).
1957 *
1958 * @return 0 on success, a Kerberos error code otherwise.
1959 */
1960 krb5_error_code smb_krb5_kinit_s4u2_ccache(krb5_context ctx,
1961 krb5_ccache store_cc,
1962 krb5_principal init_principal,
1963 const char *init_password,
1964 krb5_principal impersonate_principal,
1965 const char *self_service,
1966 const char *target_service,
1967 krb5_get_init_creds_opt *krb_options,
1968 time_t *expire_time,
1969 time_t *kdc_time)
1970 {
1971 krb5_error_code code = 0;
1972 krb5_get_creds_opt options;
1973 krb5_principal store_principal;
1974 krb5_creds store_creds;
1975 krb5_creds *s4u2self_creds;
1976 Ticket s4u2self_ticket;
1977 size_t s4u2self_ticketlen;
1978 krb5_creds *s4u2proxy_creds;
1979 krb5_principal self_princ;
1980 bool s4u2proxy;
1981 krb5_principal target_princ;
1982 krb5_ccache tmp_cc;
1983 const char *self_realm;
1984 const char *client_realm = NULL;
1985 krb5_principal blacklist_principal = NULL;
1986 krb5_principal whitelist_principal = NULL;
1987
1988 code = krb5_get_init_creds_password(ctx, &store_creds,
1989 init_principal,
1990 init_password,
1991 NULL, NULL,
1992 0,
1993 NULL,
1994 krb_options);
1995 if (code != 0) {
1996 return code;
1997 }
1998
1999 store_principal = init_principal;
2000
2001 /*
2002 * We are trying S4U2Self now:
2003 *
2004 * As we do not want to expose our TGT in the
2005 * krb5_ccache, which is also holds the impersonated creds.
2006 *
2007 * Some low level krb5/gssapi function might use the TGT
2008 * identity and let the client act as our machine account.
2009 *
2010 * We need to avoid that and use a temporary krb5_ccache
2011 * in order to pass our TGT to the krb5_get_creds() function.
2012 */
2013 code = krb5_cc_new_unique(ctx, NULL, NULL, &tmp_cc);
2014 if (code != 0) {
2015 krb5_free_cred_contents(ctx, &store_creds);
2016 return code;
2017 }
2018
2019 code = krb5_cc_initialize(ctx, tmp_cc, store_creds.client);
2020 if (code != 0) {
2021 krb5_cc_destroy(ctx, tmp_cc);
2022 krb5_free_cred_contents(ctx, &store_creds);
2023 return code;
2024 }
2025
2026 code = krb5_cc_store_cred(ctx, tmp_cc, &store_creds);
2027 if (code != 0) {
2028 krb5_free_cred_contents(ctx, &store_creds);
2029 krb5_cc_destroy(ctx, tmp_cc);
2030 return code;
2031 }
2032
2033 /*
2034 * we need to remember the client principal of our
2035 * TGT and make sure the KDC does not return this
2036 * in the impersonated tickets. This can happen
2037 * if the KDC does not support S4U2Self and S4U2Proxy.
2038 */
2039 blacklist_principal = store_creds.client;
2040 store_creds.client = NULL;
2041 krb5_free_cred_contents(ctx, &store_creds);
2042
2043 /*
2044 * Check if we also need S4U2Proxy or if S4U2Self is
2045 * enough in order to get a ticket for the target.
2046 */
2047 if (target_service == NULL) {
2048 s4u2proxy = false;
2049 } else if (strcmp(target_service, self_service) == 0) {
2050 s4u2proxy = false;
2051 } else {
2052 s4u2proxy = true;
2053 }
2054
2055 /*
2056 * For S4U2Self we need our own service principal,
2057 * which belongs to our own realm (available on
2058 * our client principal).
2059 */
2060 self_realm = krb5_principal_get_realm(ctx, init_principal);
2061
2062 code = krb5_parse_name(ctx, self_service, &self_princ);
2063 if (code != 0) {
2064 krb5_free_principal(ctx, blacklist_principal);
2065 krb5_cc_destroy(ctx, tmp_cc);
2066 return code;
2067 }
2068
2069 code = krb5_principal_set_realm(ctx, self_princ, self_realm);
2070 if (code != 0) {
2071 krb5_free_principal(ctx, blacklist_principal);
2072 krb5_free_principal(ctx, self_princ);
2073 krb5_cc_destroy(ctx, tmp_cc);
2074 return code;
2075 }
2076
2077 code = krb5_get_creds_opt_alloc(ctx, &options);
2078 if (code != 0) {
2079 krb5_free_principal(ctx, blacklist_principal);
2080 krb5_free_principal(ctx, self_princ);
2081 krb5_cc_destroy(ctx, tmp_cc);
2082 return code;
2083 }
2084
2085 if (s4u2proxy) {
2086 /*
2087 * If we want S4U2Proxy, we need the forwardable flag
2088 * on the S4U2Self ticket.
2089 */
2090 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
2091 }
2092
2093 code = krb5_get_creds_opt_set_impersonate(ctx, options,
2094 impersonate_principal);
2095 if (code != 0) {
2096 krb5_get_creds_opt_free(ctx, options);
2097 krb5_free_principal(ctx, blacklist_principal);
2098 krb5_free_principal(ctx, self_princ);
2099 krb5_cc_destroy(ctx, tmp_cc);
2100 return code;
2101 }
2102
2103 code = krb5_get_creds(ctx, options, tmp_cc,
2104 self_princ, &s4u2self_creds);
2105 krb5_get_creds_opt_free(ctx, options);
2106 krb5_free_principal(ctx, self_princ);
2107 if (code != 0) {
2108 krb5_free_principal(ctx, blacklist_principal);
2109 krb5_cc_destroy(ctx, tmp_cc);
2110 return code;
2111 }
2112
2113 if (!s4u2proxy) {
2114 krb5_cc_destroy(ctx, tmp_cc);
2115
2116 /*
2117 * Now make sure we store the impersonated principal
2118 * and creds instead of the TGT related stuff
2119 * in the krb5_ccache of the caller.
2120 */
2121 code = krb5_copy_creds_contents(ctx, s4u2self_creds,
2122 &store_creds);
2123 krb5_free_creds(ctx, s4u2self_creds);
2124 if (code != 0) {
2125 return code;
2126 }
2127
2128 /*
2129 * It's important to store the principal the KDC
2130 * returned, as otherwise the caller would not find
2131 * the S4U2Self ticket in the krb5_ccache lookup.
2132 */
2133 store_principal = store_creds.client;
2134 goto store;
2135 }
2136
2137 /*
2138 * We are trying S4U2Proxy:
2139 *
2140 * We need the ticket from the S4U2Self step
2141 * and our TGT in order to get the delegated ticket.
2142 */
2143 code = decode_Ticket((const uint8_t *)s4u2self_creds->ticket.data,
2144 s4u2self_creds->ticket.length,
2145 &s4u2self_ticket,
2146 &s4u2self_ticketlen);
2147 if (code != 0) {
2148 krb5_free_creds(ctx, s4u2self_creds);
2149 krb5_free_principal(ctx, blacklist_principal);
2150 krb5_cc_destroy(ctx, tmp_cc);
2151 return code;
2152 }
2153
2154 /*
2155 * we need to remember the client principal of the
2156 * S4U2Self stage and as it needs to match the one we
2157 * will get for the S4U2Proxy stage. We need this
2158 * in order to detect KDCs which does not support S4U2Proxy.
2159 */
2160 whitelist_principal = s4u2self_creds->client;
2161 s4u2self_creds->client = NULL;
2162 krb5_free_creds(ctx, s4u2self_creds);
2163
2164 /*
2165 * For S4U2Proxy we also got a target service principal,
2166 * which also belongs to our own realm (available on
2167 * our client principal).
2168 */
2169 code = krb5_parse_name(ctx, target_service, &target_princ);
2170 if (code != 0) {
2171 free_Ticket(&s4u2self_ticket);
2172 krb5_free_principal(ctx, whitelist_principal);
2173 krb5_free_principal(ctx, blacklist_principal);
2174 krb5_cc_destroy(ctx, tmp_cc);
2175 return code;
2176 }
2177
2178 code = krb5_principal_set_realm(ctx, target_princ, self_realm);
2179 if (code != 0) {
2180 free_Ticket(&s4u2self_ticket);
2181 krb5_free_principal(ctx, target_princ);
2182 krb5_free_principal(ctx, whitelist_principal);
2183 krb5_free_principal(ctx, blacklist_principal);
2184 krb5_cc_destroy(ctx, tmp_cc);
2185 return code;
2186 }
2187
2188 code = krb5_get_creds_opt_alloc(ctx, &options);
2189 if (code != 0) {
2190 free_Ticket(&s4u2self_ticket);
2191 krb5_free_principal(ctx, target_princ);
2192 krb5_free_principal(ctx, whitelist_principal);
2193 krb5_free_principal(ctx, blacklist_principal);
2194 krb5_cc_destroy(ctx, tmp_cc);
2195 return code;
2196 }
2197
2198 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
2199 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_CONSTRAINED_DELEGATION);
2200
2201 code = krb5_get_creds_opt_set_ticket(ctx, options, &s4u2self_ticket);
2202 free_Ticket(&s4u2self_ticket);
2203 if (code != 0) {
2204 krb5_get_creds_opt_free(ctx, options);
2205 krb5_free_principal(ctx, target_princ);
2206 krb5_free_principal(ctx, whitelist_principal);
2207 krb5_free_principal(ctx, blacklist_principal);
2208 krb5_cc_destroy(ctx, tmp_cc);
2209 return code;
2210 }
2211
2212 code = krb5_get_creds(ctx, options, tmp_cc,
2213 target_princ, &s4u2proxy_creds);
2214 krb5_get_creds_opt_free(ctx, options);
2215 krb5_free_principal(ctx, target_princ);
2216 krb5_cc_destroy(ctx, tmp_cc);
2217 if (code != 0) {
2218 krb5_free_principal(ctx, whitelist_principal);
2219 krb5_free_principal(ctx, blacklist_principal);
2220 return code;
2221 }
2222
2223 /*
2224 * Now make sure we store the impersonated principal
2225 * and creds instead of the TGT related stuff
2226 * in the krb5_ccache of the caller.
2227 */
2228 code = krb5_copy_creds_contents(ctx, s4u2proxy_creds,
2229 &store_creds);
2230 krb5_free_creds(ctx, s4u2proxy_creds);
2231 if (code != 0) {
2232 krb5_free_principal(ctx, whitelist_principal);
2233 krb5_free_principal(ctx, blacklist_principal);
2234 return code;
2235 }
2236
2237 /*
2238 * It's important to store the principal the KDC
2239 * returned, as otherwise the caller would not find
2240 * the S4U2Self ticket in the krb5_ccache lookup.
2241 */
2242 store_principal = store_creds.client;
2243
2244 store:
2245 if (blacklist_principal &&
2246 krb5_principal_compare(ctx, store_creds.client, blacklist_principal)) {
2247 char *sp = NULL;
2248 char *ip = NULL;
2249
2250 code = krb5_unparse_name(ctx, blacklist_principal, &sp);
2251 if (code != 0) {
2252 sp = NULL;
2253 }
2254 code = krb5_unparse_name(ctx, impersonate_principal, &ip);
2255 if (code != 0) {
2256 ip = NULL;
2257 }
2258 DEBUG(1, ("smb_krb5_kinit_password_cache: "
2259 "KDC returned self principal[%s] while impersonating [%s]\n",
2260 sp?sp:"<no memory>",
2261 ip?ip:"<no memory>"));
2262
2263 SAFE_FREE(sp);
2264 SAFE_FREE(ip);
2265
2266 krb5_free_principal(ctx, whitelist_principal);
2267 krb5_free_principal(ctx, blacklist_principal);
2268 krb5_free_cred_contents(ctx, &store_creds);
2269 return KRB5_FWD_BAD_PRINCIPAL;
2270 }
2271 if (blacklist_principal) {
2272 krb5_free_principal(ctx, blacklist_principal);
2273 }
2274
2275 if (whitelist_principal &&
2276 !krb5_principal_compare(ctx, store_creds.client, whitelist_principal)) {
2277 char *sp = NULL;
2278 char *ep = NULL;
2279
2280 code = krb5_unparse_name(ctx, store_creds.client, &sp);
2281 if (code != 0) {
2282 sp = NULL;
2283 }
2284 code = krb5_unparse_name(ctx, whitelist_principal, &ep);
2285 if (code != 0) {
2286 ep = NULL;
2287 }
2288 DEBUG(1, ("smb_krb5_kinit_password_cache: "
2289 "KDC returned wrong principal[%s] we expected [%s]\n",
2290 sp?sp:"<no memory>",
2291 ep?ep:"<no memory>"));
2292
2293 SAFE_FREE(sp);
2294 SAFE_FREE(ep);
2295
2296 krb5_free_principal(ctx, whitelist_principal);
2297 krb5_free_cred_contents(ctx, &store_creds);
2298 return KRB5_FWD_BAD_PRINCIPAL;
2299 }
2300 if (whitelist_principal) {
2301 krb5_free_principal(ctx, whitelist_principal);
2302 }
2303
2304 code = krb5_cc_initialize(ctx, store_cc, store_principal);
2305 if (code != 0) {
2306 krb5_free_cred_contents(ctx, &store_creds);
2307 return code;
2308 }
2309
2310 code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
2311 if (code != 0) {
2312 krb5_free_cred_contents(ctx, &store_creds);
2313 return code;
2314 }
2315
2316 client_realm = krb5_principal_get_realm(ctx, store_creds.client);
2317 if (client_realm != NULL) {
2318 /*
2319 * Because the CANON flag doesn't have any impact
2320 * on the impersonate_principal => store_creds.client
2321 * realm mapping. We need to store the credentials twice,
2322 * once with the returned realm and once with the
2323 * realm of impersonate_principal.
2324 */
2325 code = krb5_principal_set_realm(ctx, store_creds.server,
2326 client_realm);
2327 if (code != 0) {
2328 krb5_free_cred_contents(ctx, &store_creds);
2329 return code;
2330 }
2331
2332 code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
2333 if (code != 0) {
2334 krb5_free_cred_contents(ctx, &store_creds);
2335 return code;
2336 }
2337 }
2338
2339 if (expire_time) {
2340 *expire_time = (time_t) store_creds.times.endtime;
2341 }
2342
2343 if (kdc_time) {
2344 *kdc_time = (time_t) store_creds.times.starttime;
2345 }
2346
2347 krb5_free_cred_contents(ctx, &store_creds);
2348
2349 return 0;
2350 }
2351 #endif
2352
2353 #if !defined(HAVE_KRB5_MAKE_PRINCIPAL) && defined(HAVE_KRB5_BUILD_PRINCIPAL_ALLOC_VA)
2354 /**
2355 * @brief Create a principal name using a variable argument list.
2356 *
2357 * @param[in] context The library context.
2358 *
2359 * @param[inout] principal A pointer to the principal structure.
2360 *
2361 * @param[in] _realm The realm to use. If NULL then the function will
2362 * get the default realm name.
2363 *
2364 * @param[in] ... A list of 'char *' components, ending with NULL.
2365 *
2366 * Use krb5_free_principal() to free the principal when it is no longer needed.
2367 *
2368 * @return 0 on success, a Kerberos error code otherwise.
2369 */
2370 krb5_error_code smb_krb5_make_principal(krb5_context context,
2371 krb5_principal *principal,
2372 const char *_realm, ...)
2373 {
2374 krb5_error_code code;
2375 bool free_realm;
2376 char *realm;
2377 va_list ap;
2378
2379 if (_realm) {
2380 realm = discard_const_p(char, _realm);
2381 free_realm = false;
2382 } else {
2383 code = krb5_get_default_realm(context, &realm);
2384 if (code) {
2385 return code;
2386 }
2387 free_realm = true;
2388 }
2389
2390 va_start(ap, _realm);
2391 code = krb5_build_principal_alloc_va(context, principal,
2392 strlen(realm), realm,
2393 ap);
2394 va_end(ap);
2395
2396 if (free_realm) {
2397 krb5_free_default_realm(context, realm);
2398 }
2399
2400 return code;
2401 }
2402 #endif
2403
2404 #if !defined(HAVE_KRB5_CC_GET_LIFETIME) && defined(HAVE_KRB5_CC_RETRIEVE_CRED)
2405 /**
2406 * @brief Get the lifetime of the initial ticket in the cache.
2407 *
2408 * @param[in] context The kerberos context.
2409 *
2410 * @param[in] id The credential cache to get the ticket lifetime.
2411 *
2412 * @param[out] t A pointer to a time value to store the lifetime.
2413 *
2414 * @return 0 on success, a krb5_error_code on error.
2415 */
2416 krb5_error_code smb_krb5_cc_get_lifetime(krb5_context context,
2417 krb5_ccache id,
2418 time_t *t)
2419 {
2420 krb5_cc_cursor cursor;
2421 krb5_error_code kerr;
2422 krb5_creds cred;
2423 krb5_timestamp now;
2424
2425 *t = 0;
2426
2427 kerr = krb5_timeofday(context, &now);
2428 if (kerr) {
2429 return kerr;
2430 }
2431
2432 kerr = krb5_cc_start_seq_get(context, id, &cursor);
2433 if (kerr) {
2434 return kerr;
2435 }
2436
2437 while ((kerr = krb5_cc_next_cred(context, id, &cursor, &cred)) == 0) {
2438 #ifndef HAVE_FLAGS_IN_KRB5_CREDS
2439 if (cred.ticket_flags & TKT_FLG_INITIAL) {
2440 #else
2441 if (cred.flags.b.initial) {
2442 #endif
2443 if (now < cred.times.endtime) {
2444 *t = (time_t) (cred.times.endtime - now);
2445 }
2446 krb5_free_cred_contents(context, &cred);
2447 break;
2448 }
2449 krb5_free_cred_contents(context, &cred);
2450 }
2451
2452 krb5_cc_end_seq_get(context, id, &cursor);
2453
2454 return kerr;
2455 }
2456 #endif /* HAVE_KRB5_CC_GET_LIFETIME */
2457
2458 #if !defined(HAVE_KRB5_FREE_CHECKSUM_CONTENTS) && defined(HAVE_FREE_CHECKSUM)
2459 void smb_krb5_free_checksum_contents(krb5_context ctx, krb5_checksum *cksum)
2460 {
2461 free_Checksum(cksum);
2462 }
2463 #endif
2464
2465 /**
2466 * @brief Compute a checksum operating on a keyblock.
2467 *
2468 * This function computes a checksum over a PAC using the keyblock for a keyed
2469 * checksum.
2470 *
2471 * @param[in] mem_ctx A talloc context to alocate the signature on.
2472 *
2473 * @param[in] pac_data The PAC as input.
2474 *
2475 * @param[in] context The library context.
2476 *
2477 * @param[in] keyblock Encryption key for a keyed checksum.
2478 *
2479 * @param[out] sig_type The checksum type
2480 *
2481 * @param[out] sig_blob The talloc'ed checksum
2482 *
2483 * The caller must free the sig_blob with talloc_free() when it is not needed
2484 * anymore.
2485 *
2486 * @return 0 on success, a Kerberos error code otherwise.
2487 */
2488 krb5_error_code smb_krb5_make_pac_checksum(TALLOC_CTX *mem_ctx,
2489 DATA_BLOB *pac_data,
2490 krb5_context context,
2491 const krb5_keyblock *keyblock,
2492 uint32_t *sig_type,
2493 DATA_BLOB *sig_blob)
2494 {
2495 krb5_error_code ret;
2496 krb5_checksum cksum;
2497 #if defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CREATE_CHECKSUM)
2498 krb5_crypto crypto;
2499
2500
2501 ret = krb5_crypto_init(context,
2502 keyblock,
2503 0,
2504 &crypto);
2505 if (ret) {
2506 DEBUG(0,("krb5_crypto_init() failed: %s\n",
2507 smb_get_krb5_error_message(context, ret, mem_ctx)));
2508 return ret;
2509 }
2510 ret = krb5_create_checksum(context,
2511 crypto,
2512 KRB5_KU_OTHER_CKSUM,
2513 0,
2514 pac_data->data,
2515 pac_data->length,
2516 &cksum);
2517 if (ret) {
2518 DEBUG(2, ("PAC Verification failed: %s\n",
2519 smb_get_krb5_error_message(context, ret, mem_ctx)));
2520 }
2521
2522 krb5_crypto_destroy(context, crypto);
2523
2524 if (ret) {
2525 return ret;
2526 }
2527
2528 *sig_type = cksum.cksumtype;
2529 *sig_blob = data_blob_talloc(mem_ctx,
2530 cksum.checksum.data,
2531 cksum.checksum.length);
2532 #elif defined(HAVE_KRB5_C_MAKE_CHECKSUM)
2533 krb5_data input;
2534
2535 input.data = (char *)pac_data->data;
2536 input.length = pac_data->length;
2537
2538 ret = krb5_c_make_checksum(context,
2539 0,
2540 keyblock,
2541 KRB5_KEYUSAGE_APP_DATA_CKSUM,
2542 &input,
2543 &cksum);
2544 if (ret) {
2545 DEBUG(2, ("PAC Verification failed: %s\n",
2546 smb_get_krb5_error_message(context, ret, mem_ctx)));
2547 return ret;
2548 }
2549
2550 *sig_type = cksum.checksum_type;
2551 *sig_blob = data_blob_talloc(mem_ctx,
2552 cksum.contents,
2553 cksum.length);
2554
2555 #else
2556 #error krb5_create_checksum or krb5_c_make_checksum not available
2557 #endif /* HAVE_KRB5_C_MAKE_CHECKSUM */
2558 smb_krb5_free_checksum_contents(context, &cksum);
2559
2560 return 0;
2561 }
2562
2563
2564 /**
2565 * @brief Get realm of a principal
2566 *
2567 * @param[in] context The library context
2568 *
2569 * @param[in] principal The principal to get the realm from.
2570 *
2571 * @return An allocated string with the realm or NULL if an error occurred.
2572 *
2573 * The caller must free the realm string with free() if not needed anymore.
2574 */
2575 char *smb_krb5_principal_get_realm(krb5_context context,
2576 krb5_const_principal principal)
2577 {
2578 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2579 return strdup(discard_const_p(char, krb5_principal_get_realm(context, principal)));
2580 #elif defined(krb5_princ_realm) /* MIT */
2581 krb5_data *realm;
2582 realm = discard_const_p(krb5_data,
2583 krb5_princ_realm(context, principal));
2584 return strndup(realm->data, realm->length);
2585 #else
2586 #error UNKNOWN_GET_PRINC_REALM_FUNCTIONS
2587 #endif
2588 }
2589
2590 /**
2591 * @brief Get realm of a principal
2592 *
2593 * @param[in] context The library context
2594 *
2595 * @param[in] principal The principal to set the realm
2596 *
2597 * @param[in] realm The realm as a string to set.
2598 *
2599 * @retur 0 on success, a Kerberos error code otherwise.
2600 */
2601 krb5_error_code smb_krb5_principal_set_realm(krb5_context context,
2602 krb5_principal principal,
2603 const char *realm)
2604 {
2605 #ifdef HAVE_KRB5_PRINCIPAL_SET_REALM /* Heimdal */
2606 return krb5_principal_set_realm(context, principal, realm);
2607 #elif defined(krb5_princ_realm) && defined(krb5_princ_set_realm) /* MIT */
2608 krb5_error_code ret;
2609 krb5_data data;
2610 krb5_data *old_data;
2611
2612 old_data = krb5_princ_realm(context, principal);
2613
2614 ret = smb_krb5_copy_data_contents(&data,
2615 realm,
2616 strlen(realm));
2617 if (ret) {
2618 return ret;
2619 }
2620
2621 /* free realm before setting */
2622 free(old_data->data);
2623
2624 krb5_princ_set_realm(context, principal, &data);
2625
2626 return ret;
2627 #else
2628 #error UNKNOWN_PRINC_SET_REALM_FUNCTION
2629 #endif
2630 }
2631
2632
2633 /**
2634 * @brief Get the realm from the service hostname.
2635 *
2636 * This function will look for a domain realm mapping in the [domain_realm]
2637 * section of the krb5.conf first and fallback to extract the realm from
2638 * the provided service hostname. As a last resort it will return the
2639 * provided client_realm.
2640 *
2641 * @param[in] mem_ctx The talloc context
2642 *
2643 * @param[in] hostname The service hostname
2644 *
2645 * @param[in] client_realm If we can not find a mapping, fall back to
2646 * this realm.
2647 *
2648 * @return The realm to use for the service hostname, NULL if a fatal error
2649 * occured.
2650 */
2651 char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
2652 const char *hostname,
2653 const char *client_realm)
2654 {
2655 #if defined(HAVE_KRB5_REALM_TYPE)
2656 /* Heimdal. */
2657 krb5_realm *realm_list = NULL;
2658 #else
2659 /* MIT */
2660 char **realm_list = NULL;
2661 #endif
2662 char *realm = NULL;
2663 krb5_error_code kerr;
2664 krb5_context ctx = NULL;
2665
2666 initialize_krb5_error_table();
2667 if (krb5_init_context(&ctx)) {
2668 return NULL;
2669 }
2670
2671 kerr = krb5_get_host_realm(ctx, hostname, &realm_list);
2672 if (kerr != 0) {
2673 DEBUG(3,("kerberos_get_realm_from_hostname %s: "
2674 "failed %s\n",
2675 hostname ? hostname : "(NULL)",
2676 error_message(kerr) ));
2677 goto out;
2678 }
2679
2680 if (realm_list != NULL &&
2681 realm_list[0] != NULL &&
2682 realm_list[0][0] != '\0') {
2683 realm = talloc_strdup(mem_ctx, realm_list[0]);
2684 if (realm == NULL) {
2685 goto out;
2686 }
2687 } else {
2688 const char *p = NULL;
2689
2690 /*
2691 * "dc6.samba2003.example.com"
2692 * returns a realm of "SAMBA2003.EXAMPLE.COM"
2693 *
2694 * "dc6." returns realm as NULL
2695 */
2696 p = strchr_m(hostname, '.');
2697 if (p != NULL && p[1] != '\0') {
2698 realm = talloc_strdup_upper(mem_ctx, p + 1);
2699 if (realm == NULL) {
2700 goto out;
2701 }
2702 }
2703 }
2704
2705 if (realm == NULL) {
2706 realm = talloc_strdup(mem_ctx, client_realm);
2707 }
2708
2709 out:
2710
2711 if (ctx) {
2712 if (realm_list) {
2713 krb5_free_host_realm(ctx, realm_list);
2714 realm_list = NULL;
2715 }
2716 krb5_free_context(ctx);
2717 ctx = NULL;
2718 }
2719 return realm;
2720 }
2721
2722 /**
2723 * @brief Get an error string from a Kerberos error code.
2724 *
2725 * @param[in] context The library context.
2726 *
2727 * @param[in] code The Kerberos error code.
2728 *
2729 * @param[in] mem_ctx The talloc context to allocate the error string on.
2730 *
2731 * @return A talloc'ed error string or NULL if an error occurred.
2732 *
2733 * The caller must free the returned error string with talloc_free() if not
2734 * needed anymore
2735 */
2736 char *smb_get_krb5_error_message(krb5_context context,
2737 krb5_error_code code,
2738 TALLOC_CTX *mem_ctx)
2739 {
2740 char *ret;
2741
2742 #if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
2743 const char *context_error = krb5_get_error_message(context, code);
2744 if (context_error) {
2745 ret = talloc_asprintf(mem_ctx, "%s: %s",
2746 error_message(code), context_error);
2747 krb5_free_error_message(context, context_error);
2748 return ret;
2749 }
2750 #endif
2751 ret = talloc_strdup(mem_ctx, error_message(code));
2752 return ret;
2753 }
2754
2755
2756 /**
2757 * @brief Return the kerberos library setting for: libdefaults:allow_weak_crypto
2758 *
2759 * @param[in] context The library context
2760 *
2761 * @return True if weak crypto is allowed, false if not.
2762 */
2763 krb5_boolean smb_krb5_get_allowed_weak_crypto(krb5_context context)
2764 #if defined(HAVE_KRB5_CONFIG_GET_BOOL_DEFAULT)
2765 {
2766 return krb5_config_get_bool_default(context,
2767 NULL,
2768 FALSE,
2769 "libdefaults",
2770 "allow_weak_crypto",
2771 NULL);
2772 }
2773 #elif defined(HAVE_PROFILE_H) && defined(HAVE_KRB5_GET_PROFILE)
2774 {
2775 #include <profile.h>
2776 krb5_error_code ret;
2777 krb5_boolean ret_default = false;
2778 profile_t profile;
2779 int ret_profile;
2780
2781 ret = krb5_get_profile(context,
2782 &profile);
2783 if (ret) {
2784 return ret_default;
2785 }
2786
2787 ret = profile_get_boolean(profile,
2788 "libdefaults",
2789 "allow_weak_crypto",
2790 NULL, /* subsubname */
2791 ret_default, /* def_val */
2792 &ret_profile /* *ret_default */);
2793 if (ret) {
2794 return ret_default;
2795 }
2796
2797 profile_release(profile);
2798
2799 return ret_profile;
2800 }
2801 #else
2802 #error UNKNOWN_KRB5_CONFIG_ROUTINES
2803 #endif
2804
2805 /**
2806 * @brief Return the type of a krb5_principal
2807 *
2808 * @param[in] context The library context.
2809 *
2810 * @param[in] principal The principal to get the type from.
2811 *
2812 * @return The integer type of the principal.
2813 */
2814 int smb_krb5_principal_get_type(krb5_context context,
2815 krb5_const_principal principal)
2816 {
2817 #ifdef HAVE_KRB5_PRINCIPAL_GET_TYPE /* Heimdal */
2818 return krb5_principal_get_type(context, principal);
2819 #elif defined(krb5_princ_type) /* MIT */
2820 return krb5_princ_type(context, principal);
2821 #else
2822 #error UNKNOWN_PRINC_GET_TYPE_FUNCTION
2823 #endif
2824 }
2825
2826 /**
2827 * @brief Set the type of a principal
2828 *
2829 * @param[in] context The library context
2830 *
2831 * @param[inout] principal The principal to set the type for.
2832 *
2833 * @param[in] type The principal type to set.
2834 */
2835 void smb_krb5_principal_set_type(krb5_context context,
2836 krb5_principal principal,
2837 int type)
2838 {
2839 #ifdef HAVE_KRB5_PRINCIPAL_SET_TYPE /* Heimdal */
2840 krb5_principal_set_type(context, principal, type);
2841 #elif defined(krb5_princ_type) /* MIT */
2842 krb5_princ_type(context, principal) = type;
2843 #else
2844 #error UNKNOWN_PRINC_SET_TYPE_FUNCTION
2845 #endif
2846 }
2847
2848 #if !defined(HAVE_KRB5_WARNX)
2849 /**
2850 * @brief Log a Kerberos message
2851 *
2852 * It sends the message to com_err.
2853 *
2854 * @param[in] context The library context
2855 *
2856 * @param[in] fmt The message format
2857 *
2858 * @param[in] ... The message arguments
2859 *
2860 * @return 0 on success.
2861 */
2862 krb5_error_code krb5_warnx(krb5_context context, const char *fmt, ...)
2863 {
2864 va_list args;
2865
2866 va_start(args, fmt);
2867 com_err_va("samba-kdc", errno, fmt, args);
2868 va_end(args);
2869
2870 return 0;
2871 }
2872 #endif
2873
2874 /**
2875 * @brief Copy a credential cache.
2876 *
2877 * @param[in] context The library context.
2878 *
2879 * @param[in] incc Credential cache to be copied.
2880 *
2881 * @param[inout] outcc Copy of credential cache to be filled in.
2882 *
2883 * @return 0 on success, a Kerberos error code otherwise.
2884 */
2885 krb5_error_code smb_krb5_cc_copy_creds(krb5_context context,
2886 krb5_ccache incc, krb5_ccache outcc)
2887 {
2888 #ifdef HAVE_KRB5_CC_COPY_CACHE /* Heimdal */
2889 return krb5_cc_copy_cache(context, incc, outcc);
2890 #elif defined(HAVE_KRB5_CC_COPY_CREDS)
2891 krb5_error_code ret;
2892 krb5_principal princ = NULL;
2893
2894 ret = krb5_cc_get_principal(context, incc, &princ);
2895 if (ret != 0) {
2896 return ret;
2897 }
2898 ret = krb5_cc_initialize(context, outcc, princ);
2899 krb5_free_principal(context, princ);
2900 if (ret != 0) {
2901 return ret;
2902 }
2903 return krb5_cc_copy_creds(context, incc, outcc);
2904 #else
2905 #error UNKNOWN_KRB5_CC_COPY_CACHE_OR_CREDS_FUNCTION
2906 #endif
2907 }
2908
2909 /**********************************************************
2910 * ADS KRB5 CALLS
2911 **********************************************************/
2912
2913 static bool ads_cleanup_expired_creds(krb5_context context,
2914 krb5_ccache ccache,
2915 krb5_creds *credsp)
2916 {
2917 krb5_error_code retval;
2918 const char *cc_type = krb5_cc_get_type(context, ccache);
2919
2920 DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
2921 cc_type, krb5_cc_get_name(context, ccache),
2922 http_timestring(talloc_tos(), credsp->times.endtime)));
2923
2924 /* we will probably need new tickets if the current ones
2925 will expire within 10 seconds.
2926 */
2927 if (credsp->times.endtime >= (time(NULL) + 10))
2928 return false;
2929
2930 /* heimdal won't remove creds from a file ccache, and
2931 perhaps we shouldn't anyway, since internally we
2932 use memory ccaches, and a FILE one probably means that
2933 we're using creds obtained outside of our exectuable
2934 */
2935 if (strequal(cc_type, "FILE")) {
2936 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
2937 return false;
2938 }
2939
2940 retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
2941 if (retval) {
2942 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
2943 error_message(retval)));
2944 /* If we have an error in this, we want to display it,
2945 but continue as though we deleted it */
2946 }
2947 return true;
2948 }
2949
2950 /* Allocate and setup the auth context into the state we need. */
2951
2952 static krb5_error_code ads_setup_auth_context(krb5_context context,
2953 krb5_auth_context *auth_context)
2954 {
2955 krb5_error_code retval;
2956
2957 retval = krb5_auth_con_init(context, auth_context );
2958 if (retval) {
2959 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
2960 error_message(retval)));
2961 return retval;
2962 }
2963
2964 /* Ensure this is an addressless ticket. */
2965 retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
2966 if (retval) {
2967 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
2968 error_message(retval)));
2969 }
2970
2971 return retval;
2972 }
2973
2974 #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)
2975 static krb5_error_code ads_create_gss_checksum(krb5_data *in_data, /* [inout] */
2976 uint32_t gss_flags)
2977 {
2978 unsigned int orig_length = in_data->length;
2979 unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
2980 char *gss_cksum = NULL;
2981
2982 if (orig_length) {
2983 /* Extra length field for delgated ticket. */
2984 base_cksum_size += 4;
2985 }
2986
2987 if ((unsigned int)base_cksum_size + orig_length <
2988 (unsigned int)base_cksum_size) {
2989 return EINVAL;
2990 }
2991
2992 gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
2993 if (gss_cksum == NULL) {
2994 return ENOMEM;
2995 }
2996
2997 memset(gss_cksum, '\0', base_cksum_size + orig_length);
2998 SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
2999
3000 /*
3001 * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
3002 * This matches the behavior of heimdal and mit.
3003 *
3004 * And it is needed to work against some closed source
3005 * SMB servers.
3006 *
3007 * See bug #7883
3008 */
3009 memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
3010
3011 SIVAL(gss_cksum, 20, gss_flags);
3012
3013 if (orig_length) {
3014 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
3015 SSVAL(gss_cksum, 26, orig_length);
3016 /* Copy the kerberos KRB_CRED data */
3017 memcpy(gss_cksum + 28, in_data->data, orig_length);
3018 free(in_data->data);
3019 in_data->data = NULL;
3020 in_data->length = 0;
3021 }
3022 in_data->data = gss_cksum;
3023 in_data->length = base_cksum_size + orig_length;
3024 return 0;
3025 }
3026 #endif
3027
3028 /*
3029 * We can't use krb5_mk_req because w2k wants the service to be in a particular
3030 * format.
3031 */
3032 static krb5_error_code ads_krb5_mk_req(krb5_context context,
3033 krb5_auth_context *auth_context,
3034 const krb5_flags ap_req_options,
3035 const char *principal,
3036 krb5_ccache ccache,
3037 krb5_data *outbuf,
3038 time_t *expire_time,
3039 const char *impersonate_princ_s)
3040 {
3041 krb5_error_code retval;
3042 krb5_principal server;
3043 krb5_principal impersonate_princ = NULL;
3044 krb5_creds *credsp;
3045 krb5_creds creds;
3046 krb5_data in_data;
3047 bool creds_ready = false;
3048 int i = 0, maxtries = 3;
3049 bool ok;
3050
3051 ZERO_STRUCT(in_data);
3052
3053 retval = smb_krb5_parse_name(context, principal, &server);
3054 if (retval != 0) {
3055 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
3056 return retval;
3057 }
3058
3059 if (impersonate_princ_s) {
3060 retval = smb_krb5_parse_name(context, impersonate_princ_s,
3061 &impersonate_princ);
3062 if (retval) {
3063 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
3064 goto cleanup_princ;
3065 }
3066 }
3067
3068 /* obtain ticket & session key */
3069 ZERO_STRUCT(creds);
3070 if ((retval = krb5_copy_principal(context, server, &creds.server))) {
3071 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
3072 error_message(retval)));
3073 goto cleanup_princ;
3074 }
3075
3076 retval = krb5_cc_get_principal(context, ccache, &creds.client);
3077 if (retval != 0) {
3078 /* This can commonly fail on smbd startup with no ticket in the cache.
3079 * Report at higher level than 1. */
3080 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
3081 error_message(retval)));
3082 goto cleanup_creds;
3083 }
3084
3085 while (!creds_ready && (i < maxtries)) {
3086
3087 retval = smb_krb5_get_credentials(context,
3088 ccache,
3089 creds.client,
3090 creds.server,
3091 impersonate_princ,
3092 &credsp);
3093 if (retval != 0) {
3094 DBG_WARNING("smb_krb5_get_credentials failed for %s "
3095 "(%s)\n",
3096 principal,
3097 error_message(retval));
3098 goto cleanup_creds;
3099 }
3100
3101 /* cope with ticket being in the future due to clock skew */
3102 if ((unsigned)credsp->times.starttime > time(NULL)) {
3103 time_t t = time(NULL);
3104 int time_offset =(int)((unsigned)credsp->times.starttime-t);
3105 DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
3106 krb5_set_real_time(context, t + time_offset + 1, 0);
3107 }
3108
3109 ok = ads_cleanup_expired_creds(context, ccache, credsp);
3110 if (!ok) {
3111 creds_ready = true;
3112 }
3113
3114 i++;
3115 }
3116
3117 DBG_DEBUG("Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
3118 principal,
3119 krb5_cc_get_type(context, ccache),
3120 krb5_cc_get_name(context, ccache),
3121 http_timestring(talloc_tos(),
3122 (unsigned)credsp->times.endtime),
3123 (unsigned)credsp->times.endtime);
3124
3125 if (expire_time) {
3126 *expire_time = (time_t)credsp->times.endtime;
3127 }
3128
3129 /* Allocate the auth_context. */
3130 retval = ads_setup_auth_context(context, auth_context);
3131 if (retval != 0) {
3132 DBG_WARNING("ads_setup_auth_context failed (%s)\n",
3133 error_message(retval));
3134 goto cleanup_creds;
3135 }
3136
3137 #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)
3138 {
3139 uint32_t gss_flags = 0;
3140
3141 if (credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE) {
3142 /*
3143 * Fetch a forwarded TGT from the KDC so that we can
3144 * hand off a 2nd ticket as part of the kerberos
3145 * exchange.
3146 */
3147
3148 DBG_INFO("Server marked as OK to delegate to, building "
3149 "forwardable TGT\n");
3150
3151 retval = krb5_auth_con_setuseruserkey(context,
3152 *auth_context,
3153 &credsp->keyblock );
3154 if (retval != 0) {
3155 DBG_WARNING("krb5_auth_con_setuseruserkey "
3156 "failed (%s)\n",
3157 error_message(retval));
3158 goto cleanup_creds;
3159 }
3160
3161 /* Must use a subkey for forwarded tickets. */
3162 retval = krb5_auth_con_setflags(context,
3163 *auth_context,
3164 KRB5_AUTH_CONTEXT_USE_SUBKEY);
3165 if (retval != 0) {
3166 DBG_WARNING("krb5_auth_con_setflags failed (%s)\n",
3167 error_message(retval));
3168 goto cleanup_creds;
3169 }
3170
3171 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
3172 *auth_context, /* Authentication context [in] */
3173 discard_const_p(char, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
3174 credsp->client, /* Client principal for the tgt [in] */
3175 credsp->server, /* Server principal for the tgt [in] */
3176 ccache, /* Credential cache to use for storage [in] */
3177 1, /* Turn on for "Forwardable ticket" [in] */
3178 &in_data ); /* Resulting response [out] */
3179
3180 if (retval) {
3181 DBG_INFO("krb5_fwd_tgt_creds failed (%s)\n",
3182 error_message(retval));
3183
3184 /*
3185 * This is not fatal. Delete the *auth_context and continue
3186 * with krb5_mk_req_extended to get a non-forwardable ticket.
3187 */
3188
3189 if (in_data.data) {
3190 free( in_data.data );
3191 in_data.data = NULL;
3192 in_data.length = 0;
3193 }
3194 krb5_auth_con_free(context, *auth_context);
3195 *auth_context = NULL;
3196 retval = ads_setup_auth_context(context, auth_context);
3197 if (retval != 0) {
3198 DBG_WARNING("ads_setup_auth_context failed (%s)\n",
3199 error_message(retval));
3200 goto cleanup_creds;
3201 }
3202 } else {
3203 /* We got a delegated ticket. */
3204 gss_flags |= GSS_C_DELEG_FLAG;
3205 }
3206 }
3207
3208 /* Frees and reallocates in_data into a GSS checksum blob. */
3209 retval = ads_create_gss_checksum(&in_data, gss_flags);
3210 if (retval != 0) {
3211 goto cleanup_data;
3212 }
3213
3214 /* We always want GSS-checksum types. */
3215 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
3216 if (retval != 0) {
3217 DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
3218 error_message(retval)));
3219 goto cleanup_data;
3220 }
3221 }
3222 #endif
3223
3224 retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
3225 &in_data, credsp, outbuf);
3226 if (retval != 0) {
3227 DBG_WARNING("krb5_mk_req_extended failed (%s)\n",
3228 error_message(retval));
3229 }
3230
3231 #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)
3232 cleanup_data:
3233 #endif
3234
3235 if (in_data.data) {
3236 free( in_data.data );
3237 in_data.length = 0;
3238 }
3239
3240 krb5_free_creds(context, credsp);
3241
3242 cleanup_creds:
3243 krb5_free_cred_contents(context, &creds);
3244
3245 cleanup_princ:
3246 krb5_free_principal(context, server);
3247 if (impersonate_princ) {
3248 krb5_free_principal(context, impersonate_princ);
3249 }
3250
3251 return retval;
3252 }
3253
3254 /*
3255 get a kerberos5 ticket for the given service
3256 */
3257 int ads_krb5_cli_get_ticket(TALLOC_CTX *mem_ctx,
3258 const char *principal,
3259 time_t time_offset,
3260 DATA_BLOB *ticket,
3261 DATA_BLOB *session_key_krb5,
3262 uint32_t extra_ap_opts, const char *ccname,
3263 time_t *tgs_expire,
3264 const char *impersonate_princ_s)
3265 {
3266 krb5_error_code retval;
3267 krb5_data packet;
3268 krb5_context context = NULL;
3269 krb5_ccache ccdef = NULL;
3270 krb5_auth_context auth_context = NULL;
3271 krb5_enctype enc_types[] = {
3272 #ifdef HAVE_ENCTYPE_AES256_CTS_HMAC_SHA1_96
3273 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
3274 #endif
3275 #ifdef HAVE_ENCTYPE_AES128_CTS_HMAC_SHA1_96
3276 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
3277 #endif
3278 ENCTYPE_ARCFOUR_HMAC,
3279 ENCTYPE_DES_CBC_MD5,
3280 ENCTYPE_DES_CBC_CRC,
3281 ENCTYPE_NULL};
3282 bool ok;
3283
3284 initialize_krb5_error_table();
3285 retval = krb5_init_context(&context);
3286 if (retval != 0) {
3287 DBG_WARNING("krb5_init_context failed (%s)\n",
3288 error_message(retval));
3289 goto failed;
3290 }
3291
3292 if (time_offset != 0) {
3293 krb5_set_real_time(context, time(NULL) + time_offset, 0);
3294 }
3295
3296 retval = krb5_cc_resolve(context,
3297 ccname ? ccname : krb5_cc_default_name(context),
3298 &ccdef);
3299 if (retval != 0) {
3300 DBG_WARNING("krb5_cc_default failed (%s)\n",
3301 error_message(retval));
3302 goto failed;
3303 }
3304
3305 retval = krb5_set_default_tgs_ktypes(context, enc_types);
3306 if (retval != 0) {
3307 DBG_WARNING("krb5_set_default_tgs_ktypes failed (%s)\n",
3308 error_message(retval));
3309 goto failed;
3310 }
3311
3312 retval = ads_krb5_mk_req(context,
3313 &auth_context,
3314 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
3315 principal,
3316 ccdef,
3317 &packet,
3318 tgs_expire,
3319 impersonate_princ_s);
3320 if (retval != 0) {
3321 goto failed;
3322 }
3323
3324 ok = smb_krb5_get_smb_session_key(mem_ctx,
3325 context,
3326 auth_context,
3327 session_key_krb5,
3328 false);
3329 if (!ok) {
3330 retval = ENOMEM;
3331 goto failed;
3332 }
3333
3334 *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
3335
3336 smb_krb5_free_data_contents(context, &packet);
3337
3338 failed:
3339
3340 if (context) {
3341 if (ccdef) {
3342 krb5_cc_close(context, ccdef);
3343 }
3344 if (auth_context) {
3345 krb5_auth_con_free(context, auth_context);
3346 }
3347 krb5_free_context(context);
3348 }
3349
3350 return retval;
3351 }
3352
3353 #else /* HAVE_KRB5 */
3354 /* This saves a few linking headaches */
3355 int ads_krb5_cli_get_ticket(TALLOC_CTX *mem_ctx,
3356 const char *principal,
3357 time_t time_offset,
3358 DATA_BLOB *ticket,
3359 DATA_BLOB *session_key_krb5,
3360 uint32_t extra_ap_opts, const char *ccname,
3361 time_t *tgs_expire,
3362 const char *impersonate_princ_s)
3363 {
3364 DEBUG(0,("NO KERBEROS SUPPORT\n"));
3365 return 1;
3366 }
3367
3368 #endif /* HAVE_KRB5 */
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