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./examples/scripts/SambaConfig.py: fix typo in "continue"
[Samba.git] / lib / krb5_wrap / krb5_samba.c
blob8ebf601689b884626d37d45802577fcf518b3718
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 return KRB5_KT_BADNAME;
1191
1192 open_keytab:
1193 return smb_krb5_kt_open_relative(context,
1194 keytab_name_req,
1195 write_access,
1196 keytab);
1197 }
1198
1199 /**
1200 * @brief Get a key table name.
1201 *
1202 * @param[in] mem_ctx The talloc context to use for allocation.
1203 *
1204 * @param[in] context The library context.
1205 *
1206 * @param[in] keytab The key table to get the name from.
1207 *
1208 * @param[in] keytab_name A talloc'ed string of the key table name.
1209 *
1210 * The talloc'ed name string needs to be freed with talloc_free().
1211 *
1212 * @return 0 on success, a Kerberos error code otherwise.
1213 */
1214 krb5_error_code smb_krb5_kt_get_name(TALLOC_CTX *mem_ctx,
1215 krb5_context context,
1216 krb5_keytab keytab,
1217 const char **keytab_name)
1218 {
1219 char keytab_string[MAX_KEYTAB_NAME_LEN];
1220 krb5_error_code ret = 0;
1221
1222 ret = krb5_kt_get_name(context, keytab,
1223 keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1224 if (ret) {
1225 return ret;
1226 }
1227
1228 *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1229 if (!*keytab_name) {
1230 return ENOMEM;
1231 }
1232
1233 return ret;
1234 }
1235
1236 /**
1237 * @brief Seek and delete old entries in a keytab based on the passed
1238 * principal.
1239 *
1240 * @param[in] context The KRB5 context to use.
1241 *
1242 * @param[in] keytab The keytab to operate on.
1243 *
1244 * @param[in] kvno The kvnco to use.
1245 *
1246 * @param[in] princ_s The principal as a string to search for.
1247 *
1248 * @param[in] princ The principal as a krb5_principal to search for.
1249 *
1250 * @param[in] flush Weather to flush the complete keytab.
1251 *
1252 * @param[in] keep_old_entries Keep the entry with the previous kvno.
1253 *
1254 * @retval 0 on Sucess
1255 *
1256 * @return An appropriate KRB5 error code.
1257 */
1258 krb5_error_code smb_krb5_kt_seek_and_delete_old_entries(krb5_context context,
1259 krb5_keytab keytab,
1260 krb5_kvno kvno,
1261 krb5_enctype enctype,
1262 const char *princ_s,
1263 krb5_principal princ,
1264 bool flush,
1265 bool keep_old_entries)
1266 {
1267 krb5_error_code ret;
1268 krb5_kt_cursor cursor;
1269 krb5_keytab_entry kt_entry;
1270 char *ktprinc = NULL;
1271 krb5_kvno old_kvno = kvno - 1;
1272 TALLOC_CTX *tmp_ctx;
1273
1274 ZERO_STRUCT(cursor);
1275 ZERO_STRUCT(kt_entry);
1276
1277 ret = krb5_kt_start_seq_get(context, keytab, &cursor);
1278 if (ret == KRB5_KT_END || ret == ENOENT ) {
1279 /* no entries */
1280 return 0;
1281 }
1282
1283 tmp_ctx = talloc_new(NULL);
1284 if (tmp_ctx == NULL) {
1285 return ENOMEM;
1286 }
1287
1288 DEBUG(3, (__location__ ": Will try to delete old keytab entries\n"));
1289 while (!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) {
1290 bool name_ok = false;
1291 krb5_enctype kt_entry_enctype =
1292 smb_krb5_kt_get_enctype_from_entry(&kt_entry);
1293
1294 if (!flush && (princ_s != NULL)) {
1295 ret = smb_krb5_unparse_name(tmp_ctx, context,
1296 kt_entry.principal,
1297 &ktprinc);
1298 if (ret) {
1299 DEBUG(1, (__location__
1300 ": smb_krb5_unparse_name failed "
1301 "(%s)\n", error_message(ret)));
1302 goto out;
1303 }
1304
1305 #ifdef HAVE_KRB5_KT_COMPARE
1306 name_ok = krb5_kt_compare(context, &kt_entry,
1307 princ, 0, 0);
1308 #else
1309 name_ok = (strcmp(ktprinc, princ_s) == 0);
1310 #endif
1311
1312 if (!name_ok) {
1313 DEBUG(10, (__location__ ": ignoring keytab "
1314 "entry principal %s, kvno = %d\n",
1315 ktprinc, kt_entry.vno));
1316
1317 /* Not a match,
1318 * just free this entry and continue. */
1319 ret = smb_krb5_kt_free_entry(context,
1320 &kt_entry);
1321 ZERO_STRUCT(kt_entry);
1322 if (ret) {
1323 DEBUG(1, (__location__
1324 ": smb_krb5_kt_free_entry "
1325 "failed (%s)\n",
1326 error_message(ret)));
1327 goto out;
1328 }
1329
1330 TALLOC_FREE(ktprinc);
1331 continue;
1332 }
1333
1334 TALLOC_FREE(ktprinc);
1335 }
1336
1337 /*------------------------------------------------------------
1338 * Save the entries with kvno - 1. This is what microsoft does
1339 * to allow people with existing sessions that have kvno - 1
1340 * to still work. Otherwise, when the password for the machine
1341 * changes, all kerberizied sessions will 'break' until either
1342 * the client reboots or the client's session key expires and
1343 * they get a new session ticket with the new kvno.
1344 * Some keytab files only store the kvno in 8bits, limit
1345 * the compare accordingly.
1346 */
1347
1348 if (!flush && ((kt_entry.vno & 0xff) == (old_kvno & 0xff))) {
1349 DEBUG(5, (__location__ ": Saving previous (kvno %d) "
1350 "entry for principal: %s.\n",
1351 old_kvno, princ_s));
1352 continue;
1353 }
1354
1355 if (keep_old_entries) {
1356 DEBUG(5, (__location__ ": Saving old (kvno %d) "
1357 "entry for principal: %s.\n",
1358 kvno, princ_s));
1359 continue;
1360 }
1361
1362 if (!flush &&
1363 (kt_entry.vno == kvno) &&
1364 (kt_entry_enctype != enctype))
1365 {
1366 DEBUG(5, (__location__ ": Saving entry with kvno [%d] "
1367 "enctype [%d] for principal: %s.\n",
1368 kvno, kt_entry_enctype, princ_s));
1369 continue;
1370 }
1371
1372 DEBUG(5, (__location__ ": Found old entry for principal: %s "
1373 "(kvno %d) - trying to remove it.\n",
1374 princ_s, kt_entry.vno));
1375
1376 ret = krb5_kt_end_seq_get(context, keytab, &cursor);
1377 ZERO_STRUCT(cursor);
1378 if (ret) {
1379 DEBUG(1, (__location__ ": krb5_kt_end_seq_get() "
1380 "failed (%s)\n", error_message(ret)));
1381 goto out;
1382 }
1383 ret = krb5_kt_remove_entry(context, keytab, &kt_entry);
1384 if (ret) {
1385 DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
1386 "failed (%s)\n", error_message(ret)));
1387 goto out;
1388 }
1389
1390 DEBUG(5, (__location__ ": removed old entry for principal: "
1391 "%s (kvno %d).\n", princ_s, kt_entry.vno));
1392
1393 ret = krb5_kt_start_seq_get(context, keytab, &cursor);
1394 if (ret) {
1395 DEBUG(1, (__location__ ": krb5_kt_start_seq() failed "
1396 "(%s)\n", error_message(ret)));
1397 goto out;
1398 }
1399 ret = smb_krb5_kt_free_entry(context, &kt_entry);
1400 ZERO_STRUCT(kt_entry);
1401 if (ret) {
1402 DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
1403 "failed (%s)\n", error_message(ret)));
1404 goto out;
1405 }
1406 }
1407
1408 out:
1409 talloc_free(tmp_ctx);
1410 if (!all_zero((uint8_t *)&kt_entry, sizeof(kt_entry))) {
1411 smb_krb5_kt_free_entry(context, &kt_entry);
1412 }
1413 if (!all_zero((uint8_t *)&cursor, sizeof(cursor))) {
1414 krb5_kt_end_seq_get(context, keytab, &cursor);
1415 }
1416 return ret;
1417 }
1418
1419 /**
1420 * @brief Add a keytab entry for the given principal
1421 *
1422 * @param[in] context The krb5 context to use.
1423 *
1424 * @param[in] keytab The keytab to add the entry to.
1425 *
1426 * @param[in] kvno The kvno to use.
1427 *
1428 * @param[in] princ_s The principal as a string.
1429 *
1430 * @param[in] salt_principal The salt principal to salt the password with.
1431 * Only needed for keys which support salting.
1432 * If no salt is used set no_salt to false and
1433 * pass NULL here.
1434 *
1435 * @param[in] enctype The encryption type of the keytab entry.
1436 *
1437 * @param[in] password The password of the keytab entry.
1438 *
1439 * @param[in] no_salt If the password should not be salted. Normally
1440 * this is only set to false for encryption types
1441 * which do not support salting like RC4.
1442 *
1443 * @param[in] keep_old_entries Wether to keep or delte old keytab entries.
1444 *
1445 * @retval 0 on Success
1446 *
1447 * @return A corresponding KRB5 error code.
1448 *
1449 * @see smb_krb5_kt_open()
1450 */
1451 krb5_error_code smb_krb5_kt_add_entry(krb5_context context,
1452 krb5_keytab keytab,
1453 krb5_kvno kvno,
1454 const char *princ_s,
1455 const char *salt_principal,
1456 krb5_enctype enctype,
1457 krb5_data *password,
1458 bool no_salt,
1459 bool keep_old_entries)
1460 {
1461 krb5_error_code ret;
1462 krb5_keytab_entry kt_entry;
1463 krb5_principal princ = NULL;
1464 krb5_keyblock *keyp;
1465
1466 ZERO_STRUCT(kt_entry);
1467
1468 ret = smb_krb5_parse_name(context, princ_s, &princ);
1469 if (ret) {
1470 DEBUG(1, (__location__ ": smb_krb5_parse_name(%s) "
1471 "failed (%s)\n", princ_s, error_message(ret)));
1472 goto out;
1473 }
1474
1475 /* Seek and delete old keytab entries */
1476 ret = smb_krb5_kt_seek_and_delete_old_entries(context,
1477 keytab,
1478 kvno,
1479 enctype,
1480 princ_s,
1481 princ,
1482 false,
1483 keep_old_entries);
1484 if (ret) {
1485 goto out;
1486 }
1487
1488 /* If we get here, we have deleted all the old entries with kvno's
1489 * not equal to the current kvno-1. */
1490
1491 keyp = KRB5_KT_KEY(&kt_entry);
1492
1493 if (no_salt) {
1494 KRB5_KEY_DATA(keyp) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
1495 if (KRB5_KEY_DATA(keyp) == NULL) {
1496 ret = ENOMEM;
1497 goto out;
1498 }
1499 memcpy(KRB5_KEY_DATA(keyp), password->data, password->length);
1500 KRB5_KEY_LENGTH(keyp) = password->length;
1501 KRB5_KEY_TYPE(keyp) = enctype;
1502 } else {
1503 krb5_principal salt_princ = NULL;
1504
1505 /* Now add keytab entries for all encryption types */
1506 ret = smb_krb5_parse_name(context, salt_principal, &salt_princ);
1507 if (ret) {
1508 DBG_WARNING("krb5_parse_name(%s) failed (%s)\n",
1509 salt_principal, error_message(ret));
1510 goto out;
1511 }
1512
1513 ret = smb_krb5_create_key_from_string(context,
1514 salt_princ,
1515 NULL,
1516 password,
1517 enctype,
1518 keyp);
1519 krb5_free_principal(context, salt_princ);
1520 if (ret != 0) {
1521 goto out;
1522 }
1523 }
1524
1525 kt_entry.principal = princ;
1526 kt_entry.vno = kvno;
1527
1528 DEBUG(3, (__location__ ": adding keytab entry for (%s) with "
1529 "encryption type (%d) and version (%d)\n",
1530 princ_s, enctype, kt_entry.vno));
1531 ret = krb5_kt_add_entry(context, keytab, &kt_entry);
1532 krb5_free_keyblock_contents(context, keyp);
1533 ZERO_STRUCT(kt_entry);
1534 if (ret) {
1535 DEBUG(1, (__location__ ": adding entry to keytab "
1536 "failed (%s)\n", error_message(ret)));
1537 goto out;
1538 }
1539
1540 out:
1541 if (princ) {
1542 krb5_free_principal(context, princ);
1543 }
1544
1545 return ret;
1546 }
1547
1548 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1549 defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1550 defined(HAVE_KRB5_GET_CREDS)
1551 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1552 krb5_ccache ccache,
1553 krb5_principal me,
1554 krb5_principal server,
1555 krb5_principal impersonate_princ,
1556 krb5_creds **out_creds)
1557 {
1558 krb5_error_code ret;
1559 krb5_get_creds_opt opt;
1560
1561 ret = krb5_get_creds_opt_alloc(context, &opt);
1562 if (ret) {
1563 goto done;
1564 }
1565 krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1566
1567 if (impersonate_princ) {
1568 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1569 impersonate_princ);
1570 if (ret) {
1571 goto done;
1572 }
1573 }
1574
1575 ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1576 if (ret) {
1577 goto done;
1578 }
1579
1580 done:
1581 if (opt) {
1582 krb5_get_creds_opt_free(context, opt);
1583 }
1584 return ret;
1585 }
1586 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1587
1588 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1589
1590 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1591 krb5_error_code KRB5_CALLCONV
1592 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1593 krb5_ccache ccache, krb5_creds *in_creds,
1594 krb5_data *subject_cert,
1595 krb5_creds **out_creds);
1596 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1597
1598 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1599 krb5_ccache ccache,
1600 krb5_principal me,
1601 krb5_principal server,
1602 krb5_principal impersonate_princ,
1603 krb5_creds **out_creds)
1604 {
1605 krb5_error_code ret;
1606 krb5_creds in_creds;
1607
1608 ZERO_STRUCT(in_creds);
1609
1610 if (impersonate_princ) {
1611
1612 in_creds.server = me;
1613 in_creds.client = impersonate_princ;
1614
1615 ret = krb5_get_credentials_for_user(context,
1616 0, /* krb5_flags options */
1617 ccache,
1618 &in_creds,
1619 NULL, /* krb5_data *subject_cert */
1620 out_creds);
1621 } else {
1622 in_creds.client = me;
1623 in_creds.server = server;
1624
1625 ret = krb5_get_credentials(context, 0, ccache,
1626 &in_creds, out_creds);
1627 }
1628
1629 return ret;
1630 }
1631 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1632
1633 /*
1634 * smb_krb5_get_credentials
1635 *
1636 * @brief Get krb5 credentials for a server
1637 *
1638 * @param[in] context An initialized krb5_context
1639 * @param[in] ccache An initialized krb5_ccache
1640 * @param[in] me The krb5_principal of the caller
1641 * @param[in] server The krb5_principal of the requested service
1642 * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1643 * @param[out] out_creds The returned krb5_creds structure
1644 * @return krb5_error_code
1645 *
1646 */
1647 krb5_error_code smb_krb5_get_credentials(krb5_context context,
1648 krb5_ccache ccache,
1649 krb5_principal me,
1650 krb5_principal server,
1651 krb5_principal impersonate_princ,
1652 krb5_creds **out_creds)
1653 {
1654 krb5_error_code ret;
1655 krb5_creds *creds = NULL;
1656
1657 if (out_creds != NULL) {
1658 *out_creds = NULL;
1659 }
1660
1661 if (impersonate_princ) {
1662 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
1663 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
1664 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
1665 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
1666 #else
1667 ret = ENOTSUP;
1668 #endif
1669 } else {
1670 krb5_creds in_creds;
1671
1672 ZERO_STRUCT(in_creds);
1673
1674 in_creds.client = me;
1675 in_creds.server = server;
1676
1677 ret = krb5_get_credentials(context, 0, ccache,
1678 &in_creds, &creds);
1679 }
1680 if (ret) {
1681 goto done;
1682 }
1683
1684 if (out_creds) {
1685 *out_creds = creds;
1686 }
1687
1688 done:
1689 if (creds && ret) {
1690 krb5_free_creds(context, creds);
1691 }
1692
1693 return ret;
1694 }
1695
1696 /**
1697 * @brief Initialize a krb5_keyblock with the given data.
1698 *
1699 * Initialized a new keyblock, allocates the contents fo the key and
1700 * copies the data into the keyblock.
1701 *
1702 * @param[in] context The library context
1703 *
1704 * @param[in] enctype The encryption type.
1705 *
1706 * @param[in] data The date to initialize the keyblock with.
1707 *
1708 * @param[in] length The length of the keyblock.
1709 *
1710 * @param[in] key Newly allocated keyblock structure.
1711 *
1712 * The key date must be freed using krb5_free_keyblock_contents() when it is
1713 * no longer needed.
1714 *
1715 * @return 0 on success, a Kerberos error code otherwise.
1716 */
1717 krb5_error_code smb_krb5_keyblock_init_contents(krb5_context context,
1718 krb5_enctype enctype,
1719 const void *data,
1720 size_t length,
1721 krb5_keyblock *key)
1722 {
1723 #if defined(HAVE_KRB5_KEYBLOCK_INIT)
1724 return krb5_keyblock_init(context, enctype, data, length, key);
1725 #else
1726 memset(key, 0, sizeof(krb5_keyblock));
1727 KRB5_KEY_DATA(key) = SMB_MALLOC(length);
1728 if (NULL == KRB5_KEY_DATA(key)) {
1729 return ENOMEM;
1730 }
1731 memcpy(KRB5_KEY_DATA(key), data, length);
1732 KRB5_KEY_LENGTH(key) = length;
1733 KRB5_KEY_TYPE(key) = enctype;
1734 return 0;
1735 #endif
1736 }
1737
1738 /**
1739 * @brief Simulate a kinit by putting the tgt in the given credential cache.
1740 *
1741 * This function uses a keyblock rather than needingthe original password.
1742 *
1743 * @param[in] ctx The library context
1744 *
1745 * @param[in] cc The credential cache to put the tgt in.
1746 *
1747 * @param[in] principal The client princial
1748 *
1749 * @param[in] keyblock The keyblock to use.
1750 *
1751 * @param[in] target_service The service name of the initial credentials (or NULL).
1752 *
1753 * @param[in] krb_options Initial credential options.
1754 *
1755 * @param[in] expire_time A pointer to store the experation time of the
1756 * credentials (or NULL).
1757 *
1758 * @param[in] kdc_time A pointer to store the time when the ticket becomes
1759 * valid (or NULL).
1760 *
1761 * @return 0 on success, a Kerberos error code otherwise.
1762 */
1763 krb5_error_code smb_krb5_kinit_keyblock_ccache(krb5_context ctx,
1764 krb5_ccache cc,
1765 krb5_principal principal,
1766 krb5_keyblock *keyblock,
1767 const char *target_service,
1768 krb5_get_init_creds_opt *krb_options,
1769 time_t *expire_time,
1770 time_t *kdc_time)
1771 {
1772 krb5_error_code code = 0;
1773 krb5_creds my_creds;
1774
1775 #if defined(HAVE_KRB5_GET_INIT_CREDS_KEYBLOCK)
1776 code = krb5_get_init_creds_keyblock(ctx, &my_creds, principal,
1777 keyblock, 0, target_service,
1778 krb_options);
1779 #elif defined(HAVE_KRB5_GET_INIT_CREDS_KEYTAB)
1780 {
1781 #define SMB_CREDS_KEYTAB "MEMORY:tmp_smb_creds_XXXXXX"
1782 char tmp_name[sizeof(SMB_CREDS_KEYTAB)];
1783 krb5_keytab_entry entry;
1784 krb5_keytab keytab;
1785 mode_t mask;
1786
1787 memset(&entry, 0, sizeof(entry));
1788 entry.principal = principal;
1789 *(KRB5_KT_KEY(&entry)) = *keyblock;
1790
1791 memcpy(tmp_name, SMB_CREDS_KEYTAB, sizeof(SMB_CREDS_KEYTAB));
1792 mask = umask(S_IRWXO | S_IRWXG);
1793 mktemp(tmp_name);
1794 umask(mask);
1795 if (tmp_name[0] == 0) {
1796 return KRB5_KT_BADNAME;
1797 }
1798 code = krb5_kt_resolve(ctx, tmp_name, &keytab);
1799 if (code) {
1800 return code;
1801 }
1802
1803 code = krb5_kt_add_entry(ctx, keytab, &entry);
1804 if (code) {
1805 (void)krb5_kt_close(ctx, keytab);
1806 goto done;
1807 }
1808
1809 code = krb5_get_init_creds_keytab(ctx, &my_creds, principal,
1810 keytab, 0, target_service,
1811 krb_options);
1812 (void)krb5_kt_close(ctx, keytab);
1813 }
1814 #else
1815 #error krb5_get_init_creds_keyblock not available!
1816 #endif
1817 if (code) {
1818 return code;
1819 }
1820
1821 #ifndef SAMBA4_USES_HEIMDAL /* MIT */
1822 /*
1823 * We need to store the principal as returned from the KDC to the
1824 * credentials cache. If we don't do that the KRB5 library is not
1825 * able to find the tickets it is looking for
1826 */
1827 principal = my_creds.client;
1828 #endif
1829 code = krb5_cc_initialize(ctx, cc, principal);
1830 if (code) {
1831 goto done;
1832 }
1833
1834 code = krb5_cc_store_cred(ctx, cc, &my_creds);
1835 if (code) {
1836 goto done;
1837 }
1838
1839 if (expire_time) {
1840 *expire_time = (time_t) my_creds.times.endtime;
1841 }
1842
1843 if (kdc_time) {
1844 *kdc_time = (time_t) my_creds.times.starttime;
1845 }
1846
1847 code = 0;
1848 done:
1849 krb5_free_cred_contents(ctx, &my_creds);
1850 return code;
1851 }
1852
1853 /**
1854 * @brief Simulate a kinit by putting the tgt in the given credential cache.
1855 *
1856 * @param[in] ctx The library context
1857 *
1858 * @param[in] cc The credential cache to put the tgt in.
1859 *
1860 * @param[in] principal The client princial
1861 *
1862 * @param[in] password The password (or NULL).
1863 *
1864 * @param[in] target_service The service name of the initial credentials (or NULL).
1865 *
1866 * @param[in] krb_options Initial credential options.
1867 *
1868 * @param[in] expire_time A pointer to store the experation time of the
1869 * credentials (or NULL).
1870 *
1871 * @param[in] kdc_time A pointer to store the time when the ticket becomes
1872 * valid (or NULL).
1873 *
1874 * @return 0 on success, a Kerberos error code otherwise.
1875 */
1876 krb5_error_code smb_krb5_kinit_password_ccache(krb5_context ctx,
1877 krb5_ccache cc,
1878 krb5_principal principal,
1879 const char *password,
1880 const char *target_service,
1881 krb5_get_init_creds_opt *krb_options,
1882 time_t *expire_time,
1883 time_t *kdc_time)
1884 {
1885 krb5_error_code code = 0;
1886 krb5_creds my_creds;
1887
1888 code = krb5_get_init_creds_password(ctx, &my_creds, principal,
1889 password, NULL, NULL, 0,
1890 target_service, krb_options);
1891 if (code) {
1892 return code;
1893 }
1894
1895 #ifndef SAMBA4_USES_HEIMDAL /* MIT */
1896 /*
1897 * We need to store the principal as returned from the KDC to the
1898 * credentials cache. If we don't do that the KRB5 library is not
1899 * able to find the tickets it is looking for
1900 */
1901 principal = my_creds.client;
1902 #endif
1903 code = krb5_cc_initialize(ctx, cc, principal);
1904 if (code) {
1905 goto done;
1906 }
1907
1908 code = krb5_cc_store_cred(ctx, cc, &my_creds);
1909 if (code) {
1910 goto done;
1911 }
1912
1913 if (expire_time) {
1914 *expire_time = (time_t) my_creds.times.endtime;
1915 }
1916
1917 if (kdc_time) {
1918 *kdc_time = (time_t) my_creds.times.starttime;
1919 }
1920
1921 code = 0;
1922 done:
1923 krb5_free_cred_contents(ctx, &my_creds);
1924 return code;
1925 }
1926
1927 #ifdef SAMBA4_USES_HEIMDAL
1928 /**
1929 * @brief Simulate a kinit by putting the tgt in the given credential cache.
1930 *
1931 * @param[in] ctx The library context
1932 *
1933 * @param[in] cc The credential cache to store the tgt in.
1934 *
1935 * @param[in] principal The initial client princial.
1936 *
1937 * @param[in] password The password (or NULL).
1938 *
1939 * @param[in] impersonate_principal The impersonatiion principal (or NULL).
1940 *
1941 * @param[in] self_service The local service for S4U2Self if
1942 * impersonate_principal is specified).
1943 *
1944 * @param[in] target_service The service name of the initial credentials
1945 * (kpasswd/REALM or a remote service). It defaults
1946 * to the krbtgt if NULL.
1947 *
1948 * @param[in] krb_options Initial credential options.
1949 *
1950 * @param[in] expire_time A pointer to store the experation time of the
1951 * credentials (or NULL).
1952 *
1953 * @param[in] kdc_time A pointer to store the time when the ticket becomes
1954 * valid (or NULL).
1955 *
1956 * @return 0 on success, a Kerberos error code otherwise.
1957 */
1958 krb5_error_code smb_krb5_kinit_s4u2_ccache(krb5_context ctx,
1959 krb5_ccache store_cc,
1960 krb5_principal init_principal,
1961 const char *init_password,
1962 krb5_principal impersonate_principal,
1963 const char *self_service,
1964 const char *target_service,
1965 krb5_get_init_creds_opt *krb_options,
1966 time_t *expire_time,
1967 time_t *kdc_time)
1968 {
1969 krb5_error_code code = 0;
1970 krb5_get_creds_opt options;
1971 krb5_principal store_principal;
1972 krb5_creds store_creds;
1973 krb5_creds *s4u2self_creds;
1974 Ticket s4u2self_ticket;
1975 size_t s4u2self_ticketlen;
1976 krb5_creds *s4u2proxy_creds;
1977 krb5_principal self_princ;
1978 bool s4u2proxy;
1979 krb5_principal target_princ;
1980 krb5_ccache tmp_cc;
1981 const char *self_realm;
1982 const char *client_realm = NULL;
1983 krb5_principal blacklist_principal = NULL;
1984 krb5_principal whitelist_principal = NULL;
1985
1986 code = krb5_get_init_creds_password(ctx, &store_creds,
1987 init_principal,
1988 init_password,
1989 NULL, NULL,
1990 0,
1991 NULL,
1992 krb_options);
1993 if (code != 0) {
1994 return code;
1995 }
1996
1997 store_principal = init_principal;
1998
1999 /*
2000 * We are trying S4U2Self now:
2001 *
2002 * As we do not want to expose our TGT in the
2003 * krb5_ccache, which is also holds the impersonated creds.
2004 *
2005 * Some low level krb5/gssapi function might use the TGT
2006 * identity and let the client act as our machine account.
2007 *
2008 * We need to avoid that and use a temporary krb5_ccache
2009 * in order to pass our TGT to the krb5_get_creds() function.
2010 */
2011 code = krb5_cc_new_unique(ctx, NULL, NULL, &tmp_cc);
2012 if (code != 0) {
2013 krb5_free_cred_contents(ctx, &store_creds);
2014 return code;
2015 }
2016
2017 code = krb5_cc_initialize(ctx, tmp_cc, store_creds.client);
2018 if (code != 0) {
2019 krb5_cc_destroy(ctx, tmp_cc);
2020 krb5_free_cred_contents(ctx, &store_creds);
2021 return code;
2022 }
2023
2024 code = krb5_cc_store_cred(ctx, tmp_cc, &store_creds);
2025 if (code != 0) {
2026 krb5_free_cred_contents(ctx, &store_creds);
2027 krb5_cc_destroy(ctx, tmp_cc);
2028 return code;
2029 }
2030
2031 /*
2032 * we need to remember the client principal of our
2033 * TGT and make sure the KDC does not return this
2034 * in the impersonated tickets. This can happen
2035 * if the KDC does not support S4U2Self and S4U2Proxy.
2036 */
2037 blacklist_principal = store_creds.client;
2038 store_creds.client = NULL;
2039 krb5_free_cred_contents(ctx, &store_creds);
2040
2041 /*
2042 * Check if we also need S4U2Proxy or if S4U2Self is
2043 * enough in order to get a ticket for the target.
2044 */
2045 if (target_service == NULL) {
2046 s4u2proxy = false;
2047 } else if (strcmp(target_service, self_service) == 0) {
2048 s4u2proxy = false;
2049 } else {
2050 s4u2proxy = true;
2051 }
2052
2053 /*
2054 * For S4U2Self we need our own service principal,
2055 * which belongs to our own realm (available on
2056 * our client principal).
2057 */
2058 self_realm = krb5_principal_get_realm(ctx, init_principal);
2059
2060 code = krb5_parse_name(ctx, self_service, &self_princ);
2061 if (code != 0) {
2062 krb5_free_principal(ctx, blacklist_principal);
2063 krb5_cc_destroy(ctx, tmp_cc);
2064 return code;
2065 }
2066
2067 code = krb5_principal_set_realm(ctx, self_princ, self_realm);
2068 if (code != 0) {
2069 krb5_free_principal(ctx, blacklist_principal);
2070 krb5_free_principal(ctx, self_princ);
2071 krb5_cc_destroy(ctx, tmp_cc);
2072 return code;
2073 }
2074
2075 code = krb5_get_creds_opt_alloc(ctx, &options);
2076 if (code != 0) {
2077 krb5_free_principal(ctx, blacklist_principal);
2078 krb5_free_principal(ctx, self_princ);
2079 krb5_cc_destroy(ctx, tmp_cc);
2080 return code;
2081 }
2082
2083 if (s4u2proxy) {
2084 /*
2085 * If we want S4U2Proxy, we need the forwardable flag
2086 * on the S4U2Self ticket.
2087 */
2088 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
2089 }
2090
2091 code = krb5_get_creds_opt_set_impersonate(ctx, options,
2092 impersonate_principal);
2093 if (code != 0) {
2094 krb5_get_creds_opt_free(ctx, options);
2095 krb5_free_principal(ctx, blacklist_principal);
2096 krb5_free_principal(ctx, self_princ);
2097 krb5_cc_destroy(ctx, tmp_cc);
2098 return code;
2099 }
2100
2101 code = krb5_get_creds(ctx, options, tmp_cc,
2102 self_princ, &s4u2self_creds);
2103 krb5_get_creds_opt_free(ctx, options);
2104 krb5_free_principal(ctx, self_princ);
2105 if (code != 0) {
2106 krb5_free_principal(ctx, blacklist_principal);
2107 krb5_cc_destroy(ctx, tmp_cc);
2108 return code;
2109 }
2110
2111 if (!s4u2proxy) {
2112 krb5_cc_destroy(ctx, tmp_cc);
2113
2114 /*
2115 * Now make sure we store the impersonated principal
2116 * and creds instead of the TGT related stuff
2117 * in the krb5_ccache of the caller.
2118 */
2119 code = krb5_copy_creds_contents(ctx, s4u2self_creds,
2120 &store_creds);
2121 krb5_free_creds(ctx, s4u2self_creds);
2122 if (code != 0) {
2123 return code;
2124 }
2125
2126 /*
2127 * It's important to store the principal the KDC
2128 * returned, as otherwise the caller would not find
2129 * the S4U2Self ticket in the krb5_ccache lookup.
2130 */
2131 store_principal = store_creds.client;
2132 goto store;
2133 }
2134
2135 /*
2136 * We are trying S4U2Proxy:
2137 *
2138 * We need the ticket from the S4U2Self step
2139 * and our TGT in order to get the delegated ticket.
2140 */
2141 code = decode_Ticket((const uint8_t *)s4u2self_creds->ticket.data,
2142 s4u2self_creds->ticket.length,
2143 &s4u2self_ticket,
2144 &s4u2self_ticketlen);
2145 if (code != 0) {
2146 krb5_free_creds(ctx, s4u2self_creds);
2147 krb5_free_principal(ctx, blacklist_principal);
2148 krb5_cc_destroy(ctx, tmp_cc);
2149 return code;
2150 }
2151
2152 /*
2153 * we need to remember the client principal of the
2154 * S4U2Self stage and as it needs to match the one we
2155 * will get for the S4U2Proxy stage. We need this
2156 * in order to detect KDCs which does not support S4U2Proxy.
2157 */
2158 whitelist_principal = s4u2self_creds->client;
2159 s4u2self_creds->client = NULL;
2160 krb5_free_creds(ctx, s4u2self_creds);
2161
2162 /*
2163 * For S4U2Proxy we also got a target service principal,
2164 * which also belongs to our own realm (available on
2165 * our client principal).
2166 */
2167 code = krb5_parse_name(ctx, target_service, &target_princ);
2168 if (code != 0) {
2169 free_Ticket(&s4u2self_ticket);
2170 krb5_free_principal(ctx, whitelist_principal);
2171 krb5_free_principal(ctx, blacklist_principal);
2172 krb5_cc_destroy(ctx, tmp_cc);
2173 return code;
2174 }
2175
2176 code = krb5_principal_set_realm(ctx, target_princ, self_realm);
2177 if (code != 0) {
2178 free_Ticket(&s4u2self_ticket);
2179 krb5_free_principal(ctx, target_princ);
2180 krb5_free_principal(ctx, whitelist_principal);
2181 krb5_free_principal(ctx, blacklist_principal);
2182 krb5_cc_destroy(ctx, tmp_cc);
2183 return code;
2184 }
2185
2186 code = krb5_get_creds_opt_alloc(ctx, &options);
2187 if (code != 0) {
2188 free_Ticket(&s4u2self_ticket);
2189 krb5_free_principal(ctx, target_princ);
2190 krb5_free_principal(ctx, whitelist_principal);
2191 krb5_free_principal(ctx, blacklist_principal);
2192 krb5_cc_destroy(ctx, tmp_cc);
2193 return code;
2194 }
2195
2196 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
2197 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_CONSTRAINED_DELEGATION);
2198
2199 code = krb5_get_creds_opt_set_ticket(ctx, options, &s4u2self_ticket);
2200 free_Ticket(&s4u2self_ticket);
2201 if (code != 0) {
2202 krb5_get_creds_opt_free(ctx, options);
2203 krb5_free_principal(ctx, target_princ);
2204 krb5_free_principal(ctx, whitelist_principal);
2205 krb5_free_principal(ctx, blacklist_principal);
2206 krb5_cc_destroy(ctx, tmp_cc);
2207 return code;
2208 }
2209
2210 code = krb5_get_creds(ctx, options, tmp_cc,
2211 target_princ, &s4u2proxy_creds);
2212 krb5_get_creds_opt_free(ctx, options);
2213 krb5_free_principal(ctx, target_princ);
2214 krb5_cc_destroy(ctx, tmp_cc);
2215 if (code != 0) {
2216 krb5_free_principal(ctx, whitelist_principal);
2217 krb5_free_principal(ctx, blacklist_principal);
2218 return code;
2219 }
2220
2221 /*
2222 * Now make sure we store the impersonated principal
2223 * and creds instead of the TGT related stuff
2224 * in the krb5_ccache of the caller.
2225 */
2226 code = krb5_copy_creds_contents(ctx, s4u2proxy_creds,
2227 &store_creds);
2228 krb5_free_creds(ctx, s4u2proxy_creds);
2229 if (code != 0) {
2230 krb5_free_principal(ctx, whitelist_principal);
2231 krb5_free_principal(ctx, blacklist_principal);
2232 return code;
2233 }
2234
2235 /*
2236 * It's important to store the principal the KDC
2237 * returned, as otherwise the caller would not find
2238 * the S4U2Self ticket in the krb5_ccache lookup.
2239 */
2240 store_principal = store_creds.client;
2241
2242 store:
2243 if (blacklist_principal &&
2244 krb5_principal_compare(ctx, store_creds.client, blacklist_principal)) {
2245 char *sp = NULL;
2246 char *ip = NULL;
2247
2248 code = krb5_unparse_name(ctx, blacklist_principal, &sp);
2249 if (code != 0) {
2250 sp = NULL;
2251 }
2252 code = krb5_unparse_name(ctx, impersonate_principal, &ip);
2253 if (code != 0) {
2254 ip = NULL;
2255 }
2256 DEBUG(1, ("smb_krb5_kinit_password_cache: "
2257 "KDC returned self principal[%s] while impersonating [%s]\n",
2258 sp?sp:"<no memory>",
2259 ip?ip:"<no memory>"));
2260
2261 SAFE_FREE(sp);
2262 SAFE_FREE(ip);
2263
2264 krb5_free_principal(ctx, whitelist_principal);
2265 krb5_free_principal(ctx, blacklist_principal);
2266 krb5_free_cred_contents(ctx, &store_creds);
2267 return KRB5_FWD_BAD_PRINCIPAL;
2268 }
2269 if (blacklist_principal) {
2270 krb5_free_principal(ctx, blacklist_principal);
2271 }
2272
2273 if (whitelist_principal &&
2274 !krb5_principal_compare(ctx, store_creds.client, whitelist_principal)) {
2275 char *sp = NULL;
2276 char *ep = NULL;
2277
2278 code = krb5_unparse_name(ctx, store_creds.client, &sp);
2279 if (code != 0) {
2280 sp = NULL;
2281 }
2282 code = krb5_unparse_name(ctx, whitelist_principal, &ep);
2283 if (code != 0) {
2284 ep = NULL;
2285 }
2286 DEBUG(1, ("smb_krb5_kinit_password_cache: "
2287 "KDC returned wrong principal[%s] we expected [%s]\n",
2288 sp?sp:"<no memory>",
2289 ep?ep:"<no memory>"));
2290
2291 SAFE_FREE(sp);
2292 SAFE_FREE(ep);
2293
2294 krb5_free_principal(ctx, whitelist_principal);
2295 krb5_free_cred_contents(ctx, &store_creds);
2296 return KRB5_FWD_BAD_PRINCIPAL;
2297 }
2298 if (whitelist_principal) {
2299 krb5_free_principal(ctx, whitelist_principal);
2300 }
2301
2302 code = krb5_cc_initialize(ctx, store_cc, store_principal);
2303 if (code != 0) {
2304 krb5_free_cred_contents(ctx, &store_creds);
2305 return code;
2306 }
2307
2308 code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
2309 if (code != 0) {
2310 krb5_free_cred_contents(ctx, &store_creds);
2311 return code;
2312 }
2313
2314 client_realm = krb5_principal_get_realm(ctx, store_creds.client);
2315 if (client_realm != NULL) {
2316 /*
2317 * Because the CANON flag doesn't have any impact
2318 * on the impersonate_principal => store_creds.client
2319 * realm mapping. We need to store the credentials twice,
2320 * once with the returned realm and once with the
2321 * realm of impersonate_principal.
2322 */
2323 code = krb5_principal_set_realm(ctx, store_creds.server,
2324 client_realm);
2325 if (code != 0) {
2326 krb5_free_cred_contents(ctx, &store_creds);
2327 return code;
2328 }
2329
2330 code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
2331 if (code != 0) {
2332 krb5_free_cred_contents(ctx, &store_creds);
2333 return code;
2334 }
2335 }
2336
2337 if (expire_time) {
2338 *expire_time = (time_t) store_creds.times.endtime;
2339 }
2340
2341 if (kdc_time) {
2342 *kdc_time = (time_t) store_creds.times.starttime;
2343 }
2344
2345 krb5_free_cred_contents(ctx, &store_creds);
2346
2347 return 0;
2348 }
2349 #endif
2350
2351 #if !defined(HAVE_KRB5_MAKE_PRINCIPAL) && defined(HAVE_KRB5_BUILD_PRINCIPAL_ALLOC_VA)
2352 /**
2353 * @brief Create a principal name using a variable argument list.
2354 *
2355 * @param[in] context The library context.
2356 *
2357 * @param[inout] principal A pointer to the principal structure.
2358 *
2359 * @param[in] _realm The realm to use. If NULL then the function will
2360 * get the default realm name.
2361 *
2362 * @param[in] ... A list of 'char *' components, ending with NULL.
2363 *
2364 * Use krb5_free_principal() to free the principal when it is no longer needed.
2365 *
2366 * @return 0 on success, a Kerberos error code otherwise.
2367 */
2368 krb5_error_code smb_krb5_make_principal(krb5_context context,
2369 krb5_principal *principal,
2370 const char *_realm, ...)
2371 {
2372 krb5_error_code code;
2373 bool free_realm;
2374 char *realm;
2375 va_list ap;
2376
2377 if (_realm) {
2378 realm = discard_const_p(char, _realm);
2379 free_realm = false;
2380 } else {
2381 code = krb5_get_default_realm(context, &realm);
2382 if (code) {
2383 return code;
2384 }
2385 free_realm = true;
2386 }
2387
2388 va_start(ap, _realm);
2389 code = krb5_build_principal_alloc_va(context, principal,
2390 strlen(realm), realm,
2391 ap);
2392 va_end(ap);
2393
2394 if (free_realm) {
2395 krb5_free_default_realm(context, realm);
2396 }
2397
2398 return code;
2399 }
2400 #endif
2401
2402 #if !defined(HAVE_KRB5_CC_GET_LIFETIME) && defined(HAVE_KRB5_CC_RETRIEVE_CRED)
2403 /**
2404 * @brief Get the lifetime of the initial ticket in the cache.
2405 *
2406 * @param[in] context The kerberos context.
2407 *
2408 * @param[in] id The credential cache to get the ticket lifetime.
2409 *
2410 * @param[out] t A pointer to a time value to store the lifetime.
2411 *
2412 * @return 0 on success, a krb5_error_code on error.
2413 */
2414 krb5_error_code smb_krb5_cc_get_lifetime(krb5_context context,
2415 krb5_ccache id,
2416 time_t *t)
2417 {
2418 krb5_cc_cursor cursor;
2419 krb5_error_code kerr;
2420 krb5_creds cred;
2421 krb5_timestamp now;
2422
2423 *t = 0;
2424
2425 kerr = krb5_timeofday(context, &now);
2426 if (kerr) {
2427 return kerr;
2428 }
2429
2430 kerr = krb5_cc_start_seq_get(context, id, &cursor);
2431 if (kerr) {
2432 return kerr;
2433 }
2434
2435 while ((kerr = krb5_cc_next_cred(context, id, &cursor, &cred)) == 0) {
2436 #ifndef HAVE_FLAGS_IN_KRB5_CREDS
2437 if (cred.ticket_flags & TKT_FLG_INITIAL) {
2438 #else
2439 if (cred.flags.b.initial) {
2440 #endif
2441 if (now < cred.times.endtime) {
2442 *t = (time_t) (cred.times.endtime - now);
2443 }
2444 krb5_free_cred_contents(context, &cred);
2445 break;
2446 }
2447 krb5_free_cred_contents(context, &cred);
2448 }
2449
2450 krb5_cc_end_seq_get(context, id, &cursor);
2451
2452 return kerr;
2453 }
2454 #endif /* HAVE_KRB5_CC_GET_LIFETIME */
2455
2456 #if !defined(HAVE_KRB5_FREE_CHECKSUM_CONTENTS) && defined(HAVE_FREE_CHECKSUM)
2457 void smb_krb5_free_checksum_contents(krb5_context ctx, krb5_checksum *cksum)
2458 {
2459 free_Checksum(cksum);
2460 }
2461 #endif
2462
2463 /**
2464 * @brief Compute a checksum operating on a keyblock.
2465 *
2466 * This function computes a checksum over a PAC using the keyblock for a keyed
2467 * checksum.
2468 *
2469 * @param[in] mem_ctx A talloc context to alocate the signature on.
2470 *
2471 * @param[in] pac_data The PAC as input.
2472 *
2473 * @param[in] context The library context.
2474 *
2475 * @param[in] keyblock Encryption key for a keyed checksum.
2476 *
2477 * @param[out] sig_type The checksum type
2478 *
2479 * @param[out] sig_blob The talloc'ed checksum
2480 *
2481 * The caller must free the sig_blob with talloc_free() when it is not needed
2482 * anymore.
2483 *
2484 * @return 0 on success, a Kerberos error code otherwise.
2485 */
2486 krb5_error_code smb_krb5_make_pac_checksum(TALLOC_CTX *mem_ctx,
2487 DATA_BLOB *pac_data,
2488 krb5_context context,
2489 const krb5_keyblock *keyblock,
2490 uint32_t *sig_type,
2491 DATA_BLOB *sig_blob)
2492 {
2493 krb5_error_code ret;
2494 krb5_checksum cksum;
2495 #if defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CREATE_CHECKSUM)
2496 krb5_crypto crypto;
2497
2498
2499 ret = krb5_crypto_init(context,
2500 keyblock,
2501 0,
2502 &crypto);
2503 if (ret) {
2504 DEBUG(0,("krb5_crypto_init() failed: %s\n",
2505 smb_get_krb5_error_message(context, ret, mem_ctx)));
2506 return ret;
2507 }
2508 ret = krb5_create_checksum(context,
2509 crypto,
2510 KRB5_KU_OTHER_CKSUM,
2511 0,
2512 pac_data->data,
2513 pac_data->length,
2514 &cksum);
2515 if (ret) {
2516 DEBUG(2, ("PAC Verification failed: %s\n",
2517 smb_get_krb5_error_message(context, ret, mem_ctx)));
2518 }
2519
2520 krb5_crypto_destroy(context, crypto);
2521
2522 if (ret) {
2523 return ret;
2524 }
2525
2526 *sig_type = cksum.cksumtype;
2527 *sig_blob = data_blob_talloc(mem_ctx,
2528 cksum.checksum.data,
2529 cksum.checksum.length);
2530 #elif defined(HAVE_KRB5_C_MAKE_CHECKSUM)
2531 krb5_data input;
2532
2533 input.data = (char *)pac_data->data;
2534 input.length = pac_data->length;
2535
2536 ret = krb5_c_make_checksum(context,
2537 0,
2538 keyblock,
2539 KRB5_KEYUSAGE_APP_DATA_CKSUM,
2540 &input,
2541 &cksum);
2542 if (ret) {
2543 DEBUG(2, ("PAC Verification failed: %s\n",
2544 smb_get_krb5_error_message(context, ret, mem_ctx)));
2545 return ret;
2546 }
2547
2548 *sig_type = cksum.checksum_type;
2549 *sig_blob = data_blob_talloc(mem_ctx,
2550 cksum.contents,
2551 cksum.length);
2552
2553 #else
2554 #error krb5_create_checksum or krb5_c_make_checksum not available
2555 #endif /* HAVE_KRB5_C_MAKE_CHECKSUM */
2556 smb_krb5_free_checksum_contents(context, &cksum);
2557
2558 return 0;
2559 }
2560
2561
2562 /**
2563 * @brief Get realm of a principal
2564 *
2565 * @param[in] context The library context
2566 *
2567 * @param[in] principal The principal to get the realm from.
2568 *
2569 * @return An allocated string with the realm or NULL if an error occurred.
2570 *
2571 * The caller must free the realm string with free() if not needed anymore.
2572 */
2573 char *smb_krb5_principal_get_realm(krb5_context context,
2574 krb5_const_principal principal)
2575 {
2576 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2577 return strdup(discard_const_p(char, krb5_principal_get_realm(context, principal)));
2578 #elif defined(krb5_princ_realm) /* MIT */
2579 krb5_data *realm;
2580 realm = discard_const_p(krb5_data,
2581 krb5_princ_realm(context, principal));
2582 return strndup(realm->data, realm->length);
2583 #else
2584 #error UNKNOWN_GET_PRINC_REALM_FUNCTIONS
2585 #endif
2586 }
2587
2588 /**
2589 * @brief Get realm of a principal
2590 *
2591 * @param[in] context The library context
2592 *
2593 * @param[in] principal The principal to set the realm
2594 *
2595 * @param[in] realm The realm as a string to set.
2596 *
2597 * @retur 0 on success, a Kerberos error code otherwise.
2598 */
2599 krb5_error_code smb_krb5_principal_set_realm(krb5_context context,
2600 krb5_principal principal,
2601 const char *realm)
2602 {
2603 #ifdef HAVE_KRB5_PRINCIPAL_SET_REALM /* Heimdal */
2604 return krb5_principal_set_realm(context, principal, realm);
2605 #elif defined(krb5_princ_realm) && defined(krb5_princ_set_realm) /* MIT */
2606 krb5_error_code ret;
2607 krb5_data data;
2608 krb5_data *old_data;
2609
2610 old_data = krb5_princ_realm(context, principal);
2611
2612 ret = smb_krb5_copy_data_contents(&data,
2613 realm,
2614 strlen(realm));
2615 if (ret) {
2616 return ret;
2617 }
2618
2619 /* free realm before setting */
2620 free(old_data->data);
2621
2622 krb5_princ_set_realm(context, principal, &data);
2623
2624 return ret;
2625 #else
2626 #error UNKNOWN_PRINC_SET_REALM_FUNCTION
2627 #endif
2628 }
2629
2630
2631 /************************************************************************
2632 Routine to get the default realm from the kerberos credentials cache.
2633 Caller must free if the return value is not NULL.
2634 ************************************************************************/
2635
2636 static char *smb_krb5_get_default_realm_from_ccache(TALLOC_CTX *mem_ctx)
2637 {
2638 char *realm = NULL;
2639 krb5_context ctx = NULL;
2640 krb5_ccache cc = NULL;
2641 krb5_principal princ = NULL;
2642
2643 initialize_krb5_error_table();
2644 if (krb5_init_context(&ctx)) {
2645 return NULL;
2646 }
2647
2648 DEBUG(5,("kerberos_get_default_realm_from_ccache: "
2649 "Trying to read krb5 cache: %s\n",
2650 krb5_cc_default_name(ctx)));
2651 if (krb5_cc_default(ctx, &cc)) {
2652 DEBUG(5,("kerberos_get_default_realm_from_ccache: "
2653 "failed to read default cache\n"));
2654 goto out;
2655 }
2656 if (krb5_cc_get_principal(ctx, cc, &princ)) {
2657 DEBUG(5,("kerberos_get_default_realm_from_ccache: "
2658 "failed to get default principal\n"));
2659 goto out;
2660 }
2661
2662 #if defined(HAVE_KRB5_PRINCIPAL_GET_REALM)
2663 realm = talloc_strdup(mem_ctx, krb5_principal_get_realm(ctx, princ));
2664 #elif defined(HAVE_KRB5_PRINC_REALM)
2665 {
2666 krb5_data *realm_data = krb5_princ_realm(ctx, princ);
2667 realm = talloc_strndup(mem_ctx, realm_data->data, realm_data->length);
2668 }
2669 #endif
2670
2671 out:
2672
2673 if (ctx) {
2674 if (princ) {
2675 krb5_free_principal(ctx, princ);
2676 }
2677 if (cc) {
2678 krb5_cc_close(ctx, cc);
2679 }
2680 krb5_free_context(ctx);
2681 }
2682
2683 return realm;
2684 }
2685
2686 /************************************************************************
2687 Routine to get the realm from a given DNS name.
2688 ************************************************************************/
2689
2690 static char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
2691 const char *hostname)
2692 {
2693 #if defined(HAVE_KRB5_REALM_TYPE)
2694 /* Heimdal. */
2695 krb5_realm *realm_list = NULL;
2696 #else
2697 /* MIT */
2698 char **realm_list = NULL;
2699 #endif
2700 char *realm = NULL;
2701 krb5_error_code kerr;
2702 krb5_context ctx = NULL;
2703
2704 initialize_krb5_error_table();
2705 if (krb5_init_context(&ctx)) {
2706 return NULL;
2707 }
2708
2709 kerr = krb5_get_host_realm(ctx, hostname, &realm_list);
2710 if (kerr != 0) {
2711 DEBUG(3,("kerberos_get_realm_from_hostname %s: "
2712 "failed %s\n",
2713 hostname ? hostname : "(NULL)",
2714 error_message(kerr) ));
2715 goto out;
2716 }
2717
2718 if (realm_list && realm_list[0]) {
2719 realm = talloc_strdup(mem_ctx, realm_list[0]);
2720 }
2721
2722 out:
2723
2724 if (ctx) {
2725 if (realm_list) {
2726 krb5_free_host_realm(ctx, realm_list);
2727 realm_list = NULL;
2728 }
2729 krb5_free_context(ctx);
2730 ctx = NULL;
2731 }
2732 return realm;
2733 }
2734
2735 /**
2736 * @brief Get the principal as a string from the service hostname.
2737 *
2738 * @param[in] mem_ctx The talloc context
2739 *
2740 * @param[in] service The service name
2741 *
2742 * @param[in] remote_name The remote name
2743 *
2744 * @param[in] default_realm The default_realm if we cannot get it from the
2745 * hostname or netbios name.
2746 *
2747 * @return A talloc'ed principal string or NULL if an error occurred.
2748 *
2749 * The caller needs to free the principal with talloc_free() if it isn't needed
2750 * anymore.
2751 */
2752 char *smb_krb5_get_principal_from_service_hostname(TALLOC_CTX *mem_ctx,
2753 const char *service,
2754 const char *remote_name,
2755 const char *default_realm)
2756 {
2757 char *realm = NULL;
2758 char *host = NULL;
2759 char *principal;
2760 host = strchr_m(remote_name, '.');
2761 if (host) {
2762 /* DNS name. */
2763 realm = smb_krb5_get_realm_from_hostname(talloc_tos(),
2764 remote_name);
2765 } else {
2766 /* NetBIOS name - use our realm. */
2767 realm = smb_krb5_get_default_realm_from_ccache(talloc_tos());
2768 }
2769
2770 if (realm == NULL || *realm == '\0') {
2771 realm = talloc_strdup(talloc_tos(), default_realm);
2772 if (!realm) {
2773 return NULL;
2774 }
2775 DEBUG(3,("Cannot get realm from, "
2776 "desthost %s or default ccache. Using default "
2777 "smb.conf realm %s\n",
2778 remote_name,
2779 realm));
2780 }
2781
2782 principal = talloc_asprintf(mem_ctx,
2783 "%s/%s@%s",
2784 service, remote_name,
2785 realm);
2786 TALLOC_FREE(realm);
2787 return principal;
2788 }
2789
2790 /**
2791 * @brief Get an error string from a Kerberos error code.
2792 *
2793 * @param[in] context The library context.
2794 *
2795 * @param[in] code The Kerberos error code.
2796 *
2797 * @param[in] mem_ctx The talloc context to allocate the error string on.
2798 *
2799 * @return A talloc'ed error string or NULL if an error occurred.
2800 *
2801 * The caller must free the returned error string with talloc_free() if not
2802 * needed anymore
2803 */
2804 char *smb_get_krb5_error_message(krb5_context context,
2805 krb5_error_code code,
2806 TALLOC_CTX *mem_ctx)
2807 {
2808 char *ret;
2809
2810 #if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
2811 const char *context_error = krb5_get_error_message(context, code);
2812 if (context_error) {
2813 ret = talloc_asprintf(mem_ctx, "%s: %s",
2814 error_message(code), context_error);
2815 krb5_free_error_message(context, context_error);
2816 return ret;
2817 }
2818 #endif
2819 ret = talloc_strdup(mem_ctx, error_message(code));
2820 return ret;
2821 }
2822
2823
2824 /**
2825 * @brief Return the kerberos library setting for: libdefaults:allow_weak_crypto
2826 *
2827 * @param[in] context The library context
2828 *
2829 * @return True if weak crypto is allowed, false if not.
2830 */
2831 krb5_boolean smb_krb5_get_allowed_weak_crypto(krb5_context context)
2832 #if defined(HAVE_KRB5_CONFIG_GET_BOOL_DEFAULT)
2833 {
2834 return krb5_config_get_bool_default(context,
2835 NULL,
2836 FALSE,
2837 "libdefaults",
2838 "allow_weak_crypto",
2839 NULL);
2840 }
2841 #elif defined(HAVE_PROFILE_H) && defined(HAVE_KRB5_GET_PROFILE)
2842 {
2843 #include <profile.h>
2844 krb5_error_code ret;
2845 krb5_boolean ret_default = false;
2846 profile_t profile;
2847 int ret_profile;
2848
2849 ret = krb5_get_profile(context,
2850 &profile);
2851 if (ret) {
2852 return ret_default;
2853 }
2854
2855 ret = profile_get_boolean(profile,
2856 "libdefaults",
2857 "allow_weak_crypto",
2858 NULL, /* subsubname */
2859 ret_default, /* def_val */
2860 &ret_profile /* *ret_default */);
2861 if (ret) {
2862 return ret_default;
2863 }
2864
2865 profile_release(profile);
2866
2867 return ret_profile;
2868 }
2869 #else
2870 #error UNKNOWN_KRB5_CONFIG_ROUTINES
2871 #endif
2872
2873 /**
2874 * @brief Return the type of a krb5_principal
2875 *
2876 * @param[in] context The library context.
2877 *
2878 * @param[in] principal The principal to get the type from.
2879 *
2880 * @return The integer type of the principal.
2881 */
2882 int smb_krb5_principal_get_type(krb5_context context,
2883 krb5_const_principal principal)
2884 {
2885 #ifdef HAVE_KRB5_PRINCIPAL_GET_TYPE /* Heimdal */
2886 return krb5_principal_get_type(context, principal);
2887 #elif defined(krb5_princ_type) /* MIT */
2888 return krb5_princ_type(context, principal);
2889 #else
2890 #error UNKNOWN_PRINC_GET_TYPE_FUNCTION
2891 #endif
2892 }
2893
2894 /**
2895 * @brief Set the type of a principal
2896 *
2897 * @param[in] context The library context
2898 *
2899 * @param[inout] principal The principal to set the type for.
2900 *
2901 * @param[in] type The principal type to set.
2902 */
2903 void smb_krb5_principal_set_type(krb5_context context,
2904 krb5_principal principal,
2905 int type)
2906 {
2907 #ifdef HAVE_KRB5_PRINCIPAL_SET_TYPE /* Heimdal */
2908 krb5_principal_set_type(context, principal, type);
2909 #elif defined(krb5_princ_type) /* MIT */
2910 krb5_princ_type(context, principal) = type;
2911 #else
2912 #error UNKNOWN_PRINC_SET_TYPE_FUNCTION
2913 #endif
2914 }
2915
2916 #if !defined(HAVE_KRB5_WARNX)
2917 /**
2918 * @brief Log a Kerberos message
2919 *
2920 * It sends the message to com_err.
2921 *
2922 * @param[in] context The library context
2923 *
2924 * @param[in] fmt The message format
2925 *
2926 * @param[in] ... The message arguments
2927 *
2928 * @return 0 on success.
2929 */
2930 krb5_error_code krb5_warnx(krb5_context context, const char *fmt, ...)
2931 {
2932 va_list args;
2933
2934 va_start(args, fmt);
2935 com_err_va("samba-kdc", errno, fmt, args);
2936 va_end(args);
2937
2938 return 0;
2939 }
2940 #endif
2941
2942 /**
2943 * @brief Copy a credential cache.
2944 *
2945 * @param[in] context The library context.
2946 *
2947 * @param[in] incc Credential cache to be copied.
2948 *
2949 * @param[inout] outcc Copy of credential cache to be filled in.
2950 *
2951 * @return 0 on success, a Kerberos error code otherwise.
2952 */
2953 krb5_error_code smb_krb5_cc_copy_creds(krb5_context context,
2954 krb5_ccache incc, krb5_ccache outcc)
2955 {
2956 #ifdef HAVE_KRB5_CC_COPY_CACHE /* Heimdal */
2957 return krb5_cc_copy_cache(context, incc, outcc);
2958 #elif defined(HAVE_KRB5_CC_COPY_CREDS)
2959 krb5_error_code ret;
2960 krb5_principal princ = NULL;
2961
2962 ret = krb5_cc_get_principal(context, incc, &princ);
2963 if (ret != 0) {
2964 return ret;
2965 }
2966 ret = krb5_cc_initialize(context, outcc, princ);
2967 krb5_free_principal(context, princ);
2968 if (ret != 0) {
2969 return ret;
2970 }
2971 return krb5_cc_copy_creds(context, incc, outcc);
2972 #else
2973 #error UNKNOWN_KRB5_CC_COPY_CACHE_OR_CREDS_FUNCTION
2974 #endif
2975 }
2976
2977 /**********************************************************
2978 * ADS KRB5 CALLS
2979 **********************************************************/
2980
2981 static bool ads_cleanup_expired_creds(krb5_context context,
2982 krb5_ccache ccache,
2983 krb5_creds *credsp)
2984 {
2985 krb5_error_code retval;
2986 const char *cc_type = krb5_cc_get_type(context, ccache);
2987
2988 DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
2989 cc_type, krb5_cc_get_name(context, ccache),
2990 http_timestring(talloc_tos(), credsp->times.endtime)));
2991
2992 /* we will probably need new tickets if the current ones
2993 will expire within 10 seconds.
2994 */
2995 if (credsp->times.endtime >= (time(NULL) + 10))
2996 return false;
2997
2998 /* heimdal won't remove creds from a file ccache, and
2999 perhaps we shouldn't anyway, since internally we
3000 use memory ccaches, and a FILE one probably means that
3001 we're using creds obtained outside of our exectuable
3002 */
3003 if (strequal(cc_type, "FILE")) {
3004 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
3005 return false;
3006 }
3007
3008 retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
3009 if (retval) {
3010 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
3011 error_message(retval)));
3012 /* If we have an error in this, we want to display it,
3013 but continue as though we deleted it */
3014 }
3015 return true;
3016 }
3017
3018 /* Allocate and setup the auth context into the state we need. */
3019
3020 static krb5_error_code ads_setup_auth_context(krb5_context context,
3021 krb5_auth_context *auth_context)
3022 {
3023 krb5_error_code retval;
3024
3025 retval = krb5_auth_con_init(context, auth_context );
3026 if (retval) {
3027 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
3028 error_message(retval)));
3029 return retval;
3030 }
3031
3032 /* Ensure this is an addressless ticket. */
3033 retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
3034 if (retval) {
3035 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
3036 error_message(retval)));
3037 }
3038
3039 return retval;
3040 }
3041
3042 #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)
3043 static krb5_error_code ads_create_gss_checksum(krb5_data *in_data, /* [inout] */
3044 uint32_t gss_flags)
3045 {
3046 unsigned int orig_length = in_data->length;
3047 unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
3048 char *gss_cksum = NULL;
3049
3050 if (orig_length) {
3051 /* Extra length field for delgated ticket. */
3052 base_cksum_size += 4;
3053 }
3054
3055 if ((unsigned int)base_cksum_size + orig_length <
3056 (unsigned int)base_cksum_size) {
3057 return EINVAL;
3058 }
3059
3060 gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
3061 if (gss_cksum == NULL) {
3062 return ENOMEM;
3063 }
3064
3065 memset(gss_cksum, '\0', base_cksum_size + orig_length);
3066 SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
3067
3068 /*
3069 * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
3070 * This matches the behavior of heimdal and mit.
3071 *
3072 * And it is needed to work against some closed source
3073 * SMB servers.
3074 *
3075 * See bug #7883
3076 */
3077 memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
3078
3079 SIVAL(gss_cksum, 20, gss_flags);
3080
3081 if (orig_length) {
3082 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
3083 SSVAL(gss_cksum, 26, orig_length);
3084 /* Copy the kerberos KRB_CRED data */
3085 memcpy(gss_cksum + 28, in_data->data, orig_length);
3086 free(in_data->data);
3087 in_data->data = NULL;
3088 in_data->length = 0;
3089 }
3090 in_data->data = gss_cksum;
3091 in_data->length = base_cksum_size + orig_length;
3092 return 0;
3093 }
3094 #endif
3095
3096 /*
3097 * We can't use krb5_mk_req because w2k wants the service to be in a particular
3098 * format.
3099 */
3100 static krb5_error_code ads_krb5_mk_req(krb5_context context,
3101 krb5_auth_context *auth_context,
3102 const krb5_flags ap_req_options,
3103 const char *principal,
3104 krb5_ccache ccache,
3105 krb5_data *outbuf,
3106 time_t *expire_time,
3107 const char *impersonate_princ_s)
3108 {
3109 krb5_error_code retval;
3110 krb5_principal server;
3111 krb5_principal impersonate_princ = NULL;
3112 krb5_creds *credsp;
3113 krb5_creds creds;
3114 krb5_data in_data;
3115 bool creds_ready = false;
3116 int i = 0, maxtries = 3;
3117 bool ok;
3118
3119 ZERO_STRUCT(in_data);
3120
3121 retval = smb_krb5_parse_name(context, principal, &server);
3122 if (retval != 0) {
3123 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
3124 return retval;
3125 }
3126
3127 if (impersonate_princ_s) {
3128 retval = smb_krb5_parse_name(context, impersonate_princ_s,
3129 &impersonate_princ);
3130 if (retval) {
3131 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
3132 goto cleanup_princ;
3133 }
3134 }
3135
3136 /* obtain ticket & session key */
3137 ZERO_STRUCT(creds);
3138 if ((retval = krb5_copy_principal(context, server, &creds.server))) {
3139 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
3140 error_message(retval)));
3141 goto cleanup_princ;
3142 }
3143
3144 retval = krb5_cc_get_principal(context, ccache, &creds.client);
3145 if (retval != 0) {
3146 /* This can commonly fail on smbd startup with no ticket in the cache.
3147 * Report at higher level than 1. */
3148 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
3149 error_message(retval)));
3150 goto cleanup_creds;
3151 }
3152
3153 while (!creds_ready && (i < maxtries)) {
3154
3155 retval = smb_krb5_get_credentials(context,
3156 ccache,
3157 creds.client,
3158 creds.server,
3159 impersonate_princ,
3160 &credsp);
3161 if (retval != 0) {
3162 DBG_WARNING("smb_krb5_get_credentials failed for %s "
3163 "(%s)\n",
3164 principal,
3165 error_message(retval));
3166 goto cleanup_creds;
3167 }
3168
3169 /* cope with ticket being in the future due to clock skew */
3170 if ((unsigned)credsp->times.starttime > time(NULL)) {
3171 time_t t = time(NULL);
3172 int time_offset =(int)((unsigned)credsp->times.starttime-t);
3173 DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
3174 krb5_set_real_time(context, t + time_offset + 1, 0);
3175 }
3176
3177 ok = ads_cleanup_expired_creds(context, ccache, credsp);
3178 if (!ok) {
3179 creds_ready = true;
3180 }
3181
3182 i++;
3183 }
3184
3185 DBG_DEBUG("Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
3186 principal,
3187 krb5_cc_get_type(context, ccache),
3188 krb5_cc_get_name(context, ccache),
3189 http_timestring(talloc_tos(),
3190 (unsigned)credsp->times.endtime),
3191 (unsigned)credsp->times.endtime);
3192
3193 if (expire_time) {
3194 *expire_time = (time_t)credsp->times.endtime;
3195 }
3196
3197 /* Allocate the auth_context. */
3198 retval = ads_setup_auth_context(context, auth_context);
3199 if (retval != 0) {
3200 DBG_WARNING("ads_setup_auth_context failed (%s)\n",
3201 error_message(retval));
3202 goto cleanup_creds;
3203 }
3204
3205 #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)
3206 {
3207 uint32_t gss_flags = 0;
3208
3209 if (credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE) {
3210 /*
3211 * Fetch a forwarded TGT from the KDC so that we can
3212 * hand off a 2nd ticket as part of the kerberos
3213 * exchange.
3214 */
3215
3216 DBG_INFO("Server marked as OK to delegate to, building "
3217 "forwardable TGT\n");
3218
3219 retval = krb5_auth_con_setuseruserkey(context,
3220 *auth_context,
3221 &credsp->keyblock );
3222 if (retval != 0) {
3223 DBG_WARNING("krb5_auth_con_setuseruserkey "
3224 "failed (%s)\n",
3225 error_message(retval));
3226 goto cleanup_creds;
3227 }
3228
3229 /* Must use a subkey for forwarded tickets. */
3230 retval = krb5_auth_con_setflags(context,
3231 *auth_context,
3232 KRB5_AUTH_CONTEXT_USE_SUBKEY);
3233 if (retval != 0) {
3234 DBG_WARNING("krb5_auth_con_setflags failed (%s)\n",
3235 error_message(retval));
3236 goto cleanup_creds;
3237 }
3238
3239 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
3240 *auth_context, /* Authentication context [in] */
3241 discard_const_p(char, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
3242 credsp->client, /* Client principal for the tgt [in] */
3243 credsp->server, /* Server principal for the tgt [in] */
3244 ccache, /* Credential cache to use for storage [in] */
3245 1, /* Turn on for "Forwardable ticket" [in] */
3246 &in_data ); /* Resulting response [out] */
3247
3248 if (retval) {
3249 DBG_INFO("krb5_fwd_tgt_creds failed (%s)\n",
3250 error_message(retval));
3251
3252 /*
3253 * This is not fatal. Delete the *auth_context and continue
3254 * with krb5_mk_req_extended to get a non-forwardable ticket.
3255 */
3256
3257 if (in_data.data) {
3258 free( in_data.data );
3259 in_data.data = NULL;
3260 in_data.length = 0;
3261 }
3262 krb5_auth_con_free(context, *auth_context);
3263 *auth_context = NULL;
3264 retval = ads_setup_auth_context(context, auth_context);
3265 if (retval != 0) {
3266 DBG_WARNING("ads_setup_auth_context failed (%s)\n",
3267 error_message(retval));
3268 goto cleanup_creds;
3269 }
3270 } else {
3271 /* We got a delegated ticket. */
3272 gss_flags |= GSS_C_DELEG_FLAG;
3273 }
3274 }
3275
3276 /* Frees and reallocates in_data into a GSS checksum blob. */
3277 retval = ads_create_gss_checksum(&in_data, gss_flags);
3278 if (retval != 0) {
3279 goto cleanup_data;
3280 }
3281
3282 /* We always want GSS-checksum types. */
3283 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
3284 if (retval != 0) {
3285 DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
3286 error_message(retval)));
3287 goto cleanup_data;
3288 }
3289 }
3290 #endif
3291
3292 retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
3293 &in_data, credsp, outbuf);
3294 if (retval != 0) {
3295 DBG_WARNING("krb5_mk_req_extended failed (%s)\n",
3296 error_message(retval));
3297 }
3298
3299 #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)
3300 cleanup_data:
3301 #endif
3302
3303 if (in_data.data) {
3304 free( in_data.data );
3305 in_data.length = 0;
3306 }
3307
3308 krb5_free_creds(context, credsp);
3309
3310 cleanup_creds:
3311 krb5_free_cred_contents(context, &creds);
3312
3313 cleanup_princ:
3314 krb5_free_principal(context, server);
3315 if (impersonate_princ) {
3316 krb5_free_principal(context, impersonate_princ);
3317 }
3318
3319 return retval;
3320 }
3321
3322 /*
3323 get a kerberos5 ticket for the given service
3324 */
3325 int ads_krb5_cli_get_ticket(TALLOC_CTX *mem_ctx,
3326 const char *principal,
3327 time_t time_offset,
3328 DATA_BLOB *ticket,
3329 DATA_BLOB *session_key_krb5,
3330 uint32_t extra_ap_opts, const char *ccname,
3331 time_t *tgs_expire,
3332 const char *impersonate_princ_s)
3333 {
3334 krb5_error_code retval;
3335 krb5_data packet;
3336 krb5_context context = NULL;
3337 krb5_ccache ccdef = NULL;
3338 krb5_auth_context auth_context = NULL;
3339 krb5_enctype enc_types[] = {
3340 #ifdef HAVE_ENCTYPE_AES256_CTS_HMAC_SHA1_96
3341 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
3342 #endif
3343 #ifdef HAVE_ENCTYPE_AES128_CTS_HMAC_SHA1_96
3344 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
3345 #endif
3346 ENCTYPE_ARCFOUR_HMAC,
3347 ENCTYPE_DES_CBC_MD5,
3348 ENCTYPE_DES_CBC_CRC,
3349 ENCTYPE_NULL};
3350 bool ok;
3351
3352 initialize_krb5_error_table();
3353 retval = krb5_init_context(&context);
3354 if (retval != 0) {
3355 DBG_WARNING("krb5_init_context failed (%s)\n",
3356 error_message(retval));
3357 goto failed;
3358 }
3359
3360 if (time_offset != 0) {
3361 krb5_set_real_time(context, time(NULL) + time_offset, 0);
3362 }
3363
3364 retval = krb5_cc_resolve(context,
3365 ccname ? ccname : krb5_cc_default_name(context),
3366 &ccdef);
3367 if (retval != 0) {
3368 DBG_WARNING("krb5_cc_default failed (%s)\n",
3369 error_message(retval));
3370 goto failed;
3371 }
3372
3373 retval = krb5_set_default_tgs_ktypes(context, enc_types);
3374 if (retval != 0) {
3375 DBG_WARNING("krb5_set_default_tgs_ktypes failed (%s)\n",
3376 error_message(retval));
3377 goto failed;
3378 }
3379
3380 retval = ads_krb5_mk_req(context,
3381 &auth_context,
3382 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
3383 principal,
3384 ccdef,
3385 &packet,
3386 tgs_expire,
3387 impersonate_princ_s);
3388 if (retval != 0) {
3389 goto failed;
3390 }
3391
3392 ok = smb_krb5_get_smb_session_key(mem_ctx,
3393 context,
3394 auth_context,
3395 session_key_krb5,
3396 false);
3397 if (!ok) {
3398 retval = ENOMEM;
3399 goto failed;
3400 }
3401
3402 *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
3403
3404 smb_krb5_free_data_contents(context, &packet);
3405
3406 failed:
3407
3408 if (context) {
3409 if (ccdef) {
3410 krb5_cc_close(context, ccdef);
3411 }
3412 if (auth_context) {
3413 krb5_auth_con_free(context, auth_context);
3414 }
3415 krb5_free_context(context);
3416 }
3417
3418 return retval;
3419 }
3420
3421 #else /* HAVE_KRB5 */
3422 /* This saves a few linking headaches */
3423 int ads_krb5_cli_get_ticket(TALLOC_CTX *mem_ctx,
3424 const char *principal,
3425 time_t time_offset,
3426 DATA_BLOB *ticket,
3427 DATA_BLOB *session_key_krb5,
3428 uint32_t extra_ap_opts, const char *ccname,
3429 time_t *tgs_expire,
3430 const char *impersonate_princ_s)
3431 {
3432 DEBUG(0,("NO KERBEROS SUPPORT\n"));
3433 return 1;
3434 }
3435
3436 #endif /* HAVE_KRB5 */
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