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lib:util: Remove redundant casts in PUSH_*() macros
[Samba.git] / lib / krb5_wrap / krb5_samba.c
blob116f916234da7e74117dae70f95146ce552c29d8
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/md4.h"
27 #include "../libds/common/flags.h"
28
29 #ifdef HAVE_COM_ERR_H
30 #include <com_err.h>
31 #endif /* HAVE_COM_ERR_H */
32
33 #ifndef KRB5_AUTHDATA_WIN2K_PAC
34 #define KRB5_AUTHDATA_WIN2K_PAC 128
35 #endif
36
37 #ifndef KRB5_AUTHDATA_IF_RELEVANT
38 #define KRB5_AUTHDATA_IF_RELEVANT 1
39 #endif
40
41 #ifdef HAVE_KRB5
42
43 #define GSSAPI_CHECKSUM 0x8003 /* Checksum type value for Kerberos */
44 #define GSSAPI_BNDLENGTH 16 /* Bind Length (rfc-1964 pg.3) */
45 #define GSSAPI_CHECKSUM_SIZE (4+GSSAPI_BNDLENGTH+4) /* Length of bind length,
46 bind field, flags field. */
47 #define GSS_C_DELEG_FLAG 1
48
49 /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
50 but still has the symbol */
51 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
52 krb5_error_code krb5_auth_con_set_req_cksumtype(
53 krb5_context context,
54 krb5_auth_context auth_context,
55 krb5_cksumtype cksumtype);
56 #endif
57
58 #if !defined(SMB_MALLOC)
59 #undef malloc
60 #define SMB_MALLOC(s) malloc((s))
61 #endif
62
63 #ifndef SMB_STRDUP
64 #define SMB_STRDUP(s) strdup(s)
65 #endif
66
67 /**********************************************************
68 * MISSING FUNCTIONS
69 **********************************************************/
70
71 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
72
73 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
74
75 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
76 * to krb5_set_default_tgs_ktypes. See
77 * http://lists.samba.org/archive/samba-technical/2006-July/048271.html
78 *
79 * If the MIT libraries are not exporting internal symbols, we will end up in
80 * this branch, which is correct. Otherwise we will continue to use the
81 * internal symbol
82 */
83 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
84 {
85 return krb5_set_default_tgs_enctypes(ctx, enc);
86 }
87
88 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
89
90 /* Heimdal */
91 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
92 {
93 return krb5_set_default_in_tkt_etypes(ctx, enc);
94 }
95
96 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
97
98 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
99
100
101 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
102 krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
103 krb5_auth_context auth_context,
104 krb5_keyblock *keyblock)
105 {
106 return krb5_auth_con_setkey(context, auth_context, keyblock);
107 }
108 #endif
109
110 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
111 void krb5_free_unparsed_name(krb5_context context, char *val)
112 {
113 SAFE_FREE(val);
114 }
115 #endif
116
117 #if !defined(HAVE_KRB5_FREE_ENCTYPES)
118 void krb5_free_enctypes(krb5_context context, krb5_enctype *val) {
119 krb5_xfree(val);
120 }
121 #endif
122
123 #if !defined(HAVE_KRB5_FREE_STRING)
124 void krb5_free_string(krb5_context context, char *val) {
125 SAFE_FREE(val);
126 }
127 #endif
128
129 krb5_error_code smb_krb5_princ_component(krb5_context context,
130 krb5_const_principal principal,
131 int i,
132 krb5_data *data);
133 krb5_error_code smb_krb5_princ_component(krb5_context context,
134 krb5_const_principal principal,
135 int i,
136 krb5_data *data)
137 {
138 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
139 const char *component = NULL;
140
141 if (i < 0) {
142 return EINVAL;
143 }
144
145 component = krb5_principal_get_comp_string(context, principal, i);
146 if (component == NULL) {
147 return ENOENT;
148 }
149
150 *data = smb_krb5_make_data(discard_const_p(char, component), strlen(component));
151
152 return 0;
153 #else
154 const krb5_data *kdata = NULL;
155
156 if (i < 0) {
157 return EINVAL;
158 }
159
160 kdata = krb5_princ_component(context, principal, i);
161 if (kdata == NULL) {
162 return ENOENT;
163 }
164
165 *data = *kdata;
166
167 return 0;
168 #endif
169 }
170
171 /**********************************************************
172 * WRAPPING FUNCTIONS
173 **********************************************************/
174
175 /**
176 * @brief Stores the address of a 'struct sockaddr_storage' into a krb5_address
177 *
178 * @param[in] paddr A pointer to a 'struct sockaddr_storage to extract the
179 * address from.
180 *
181 * @param[out] pkaddr A Kerberos address to store the address in.
182 *
183 * @return True on success, false if an error occurred.
184 */
185 bool smb_krb5_sockaddr_to_kaddr(struct sockaddr_storage *paddr,
186 krb5_address *pkaddr)
187 {
188 memset(pkaddr, '\0', sizeof(krb5_address));
189 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
190 /* HEIMDAL */
191 #ifdef HAVE_IPV6
192 if (paddr->ss_family == AF_INET6) {
193 pkaddr->addr_type = KRB5_ADDRESS_INET6;
194 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
195 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
196 return true;
197 }
198 #endif
199 if (paddr->ss_family == AF_INET) {
200 pkaddr->addr_type = KRB5_ADDRESS_INET;
201 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
202 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
203 return true;
204 }
205 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
206 /* MIT */
207 #ifdef HAVE_IPV6
208 if (paddr->ss_family == AF_INET6) {
209 pkaddr->addrtype = ADDRTYPE_INET6;
210 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
211 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
212 return true;
213 }
214 #endif
215 if (paddr->ss_family == AF_INET) {
216 pkaddr->addrtype = ADDRTYPE_INET;
217 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
218 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
219 return true;
220 }
221 #else
222 #error UNKNOWN_ADDRTYPE
223 #endif
224 return false;
225 }
226
227 krb5_error_code smb_krb5_mk_error(krb5_context context,
228 krb5_error_code error_code,
229 const char *e_text,
230 krb5_data *e_data,
231 const krb5_principal client,
232 const krb5_principal server,
233 krb5_data *enc_err)
234 {
235 krb5_error_code code = EINVAL;
236 #ifdef SAMBA4_USES_HEIMDAL
237 code = krb5_mk_error(context,
238 error_code,
239 e_text,
240 e_data,
241 client,
242 server,
243 NULL, /* client_time */
244 NULL, /* client_usec */
245 enc_err);
246 #else
247 krb5_principal unspec_server = NULL;
248 krb5_error errpkt;
249
250 errpkt.ctime = 0;
251 errpkt.cusec = 0;
252
253 code = krb5_us_timeofday(context,
254 &errpkt.stime,
255 &errpkt.susec);
256 if (code != 0) {
257 return code;
258 }
259
260 errpkt.error = error_code - ERROR_TABLE_BASE_krb5;
261
262 errpkt.text.length = 0;
263 if (e_text != NULL) {
264 errpkt.text = smb_krb5_make_data(discard_const_p(char, e_text), strlen(e_text));
265 }
266
267 errpkt.e_data = smb_krb5_make_data(NULL, 0);
268 if (e_data != NULL) {
269 errpkt.e_data = *e_data;
270 }
271
272 errpkt.client = client;
273
274 if (server != NULL) {
275 errpkt.server = server;
276 } else {
277 code = smb_krb5_make_principal(context,
278 &unspec_server,
279 "<unspecified realm>",
280 NULL);
281 if (code != 0) {
282 return code;
283 }
284 errpkt.server = unspec_server;
285 }
286
287 code = krb5_mk_error(context,
288 &errpkt,
289 enc_err);
290 krb5_free_principal(context, unspec_server);
291 #endif
292 return code;
293 }
294
295 /**
296 * @brief Create a keyblock based on input parameters
297 *
298 * @param context The krb5_context
299 * @param host_princ The krb5_principal to use
300 * @param salt The optional salt, if omitted, salt is calculated with
301 * the provided principal.
302 * @param password The krb5_data containing the password
303 * @param enctype The krb5_enctype to use for the keyblock generation
304 * @param key The returned krb5_keyblock, caller needs to free with
305 * krb5_free_keyblock().
306 *
307 * @return krb5_error_code
308 */
309 int smb_krb5_create_key_from_string(krb5_context context,
310 krb5_const_principal host_princ,
311 const krb5_data *salt,
312 const krb5_data *password,
313 krb5_enctype enctype,
314 krb5_keyblock *key)
315 {
316 int ret = 0;
317
318 if (host_princ == NULL && salt == NULL) {
319 return -1;
320 }
321
322 if ((int)enctype == (int)ENCTYPE_ARCFOUR_HMAC) {
323 TALLOC_CTX *frame = talloc_stackframe();
324 uint8_t *utf16 = NULL;
325 size_t utf16_size = 0;
326 uint8_t nt_hash[16];
327 bool ok;
328
329 ok = convert_string_talloc(frame, CH_UNIX, CH_UTF16LE,
330 password->data, password->length,
331 &utf16, &utf16_size);
332 if (!ok) {
333 if (errno == 0) {
334 errno = EINVAL;
335 }
336 ret = errno;
337 TALLOC_FREE(frame);
338 return ret;
339 }
340
341 mdfour(nt_hash, utf16, utf16_size);
342 BURN_PTR_SIZE(utf16, utf16_size);
343 ret = smb_krb5_keyblock_init_contents(context,
344 ENCTYPE_ARCFOUR_HMAC,
345 nt_hash,
346 sizeof(nt_hash),
347 key);
348 ZERO_STRUCT(nt_hash);
349 if (ret != 0) {
350 TALLOC_FREE(frame);
351 return ret;
352 }
353
354 TALLOC_FREE(frame);
355 return 0;
356 }
357
358 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_C_STRING_TO_KEY)
359 {/* MIT */
360 krb5_data _salt;
361
362 if (salt == NULL) {
363 ret = krb5_principal2salt(context, host_princ, &_salt);
364 if (ret) {
365 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
366 return ret;
367 }
368 } else {
369 _salt = *salt;
370 }
371 ret = krb5_c_string_to_key(context, enctype, password, &_salt, key);
372 if (salt == NULL) {
373 SAFE_FREE(_salt.data);
374 }
375 }
376 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
377 {/* Heimdal */
378 krb5_salt _salt;
379
380 if (salt == NULL) {
381 ret = krb5_get_pw_salt(context, host_princ, &_salt);
382 if (ret) {
383 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
384 return ret;
385 }
386 } else {
387 _salt.saltvalue = *salt;
388 _salt.salttype = KRB5_PW_SALT;
389 }
390
391 ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, _salt, key);
392 if (salt == NULL) {
393 krb5_free_salt(context, _salt);
394 }
395 }
396 #else
397 #error UNKNOWN_CREATE_KEY_FUNCTIONS
398 #endif
399 return ret;
400 }
401
402 /**
403 * @brief Create a salt for a given principal
404 *
405 * @param context The initialized krb5_context
406 * @param host_princ The krb5_principal to create the salt for
407 * @param psalt A pointer to a krb5_data struct
408 *
409 * caller has to free the contents of psalt with smb_krb5_free_data_contents
410 * when function has succeeded
411 *
412 * @return krb5_error_code, returns 0 on success, error code otherwise
413 */
414
415 int smb_krb5_get_pw_salt(krb5_context context,
416 krb5_const_principal host_princ,
417 krb5_data *psalt)
418 #if defined(HAVE_KRB5_GET_PW_SALT)
419 /* Heimdal */
420 {
421 int ret;
422 krb5_salt salt;
423
424 ret = krb5_get_pw_salt(context, host_princ, &salt);
425 if (ret) {
426 return ret;
427 }
428
429 *psalt = salt.saltvalue;
430
431 return ret;
432 }
433 #elif defined(HAVE_KRB5_PRINCIPAL2SALT)
434 /* MIT */
435 {
436 return krb5_principal2salt(context, host_princ, psalt);
437 }
438 #else
439 #error UNKNOWN_SALT_FUNCTIONS
440 #endif
441
442 /**
443 * @brief This constructs the salt principal used by active directory
444 *
445 * Most Kerberos encryption types require a salt in order to
446 * calculate the long term private key for user/computer object
447 * based on a password.
448 *
449 * The returned _salt_principal is a string in forms like this:
450 * - host/somehost.example.com@EXAMPLE.COM
451 * - SomeAccount@EXAMPLE.COM
452 * - SomePrincipal@EXAMPLE.COM
453 *
454 * This is not the form that's used as salt, it's just
455 * the human readable form. It needs to be converted by
456 * smb_krb5_salt_principal2data().
457 *
458 * @param[in] realm The realm the user/computer is added too.
459 *
460 * @param[in] sAMAccountName The sAMAccountName attribute of the object.
461 *
462 * @param[in] userPrincipalName The userPrincipalName attribute of the object
463 * or NULL if not available.
464 *
465 * @param[in] uac_flags UF_ACCOUNT_TYPE_MASKed userAccountControl field
466 *
467 * @param[in] mem_ctx The TALLOC_CTX to allocate _salt_principal.
468 *
469 * @param[out] _salt_principal The resulting principal as string.
470 *
471 * @retval 0 Success; otherwise - Kerberos error codes
472 *
473 * @see smb_krb5_salt_principal2data
474 */
475 int smb_krb5_salt_principal(krb5_context krb5_ctx,
476 const char *realm,
477 const char *sAMAccountName,
478 const char *userPrincipalName,
479 uint32_t uac_flags,
480 krb5_principal *salt_princ)
481 {
482 TALLOC_CTX *frame = talloc_stackframe();
483 char *upper_realm = NULL;
484 const char *principal = NULL;
485 int principal_len = 0;
486 krb5_error_code krb5_ret;
487
488 *salt_princ = NULL;
489
490 if (sAMAccountName == NULL) {
491 TALLOC_FREE(frame);
492 return EINVAL;
493 }
494
495 if (realm == NULL) {
496 TALLOC_FREE(frame);
497 return EINVAL;
498 }
499
500 if (uac_flags & ~UF_ACCOUNT_TYPE_MASK) {
501 /*
502 * catch callers which still
503 * pass 'true'.
504 */
505 TALLOC_FREE(frame);
506 return EINVAL;
507 }
508 if (uac_flags == 0) {
509 /*
510 * catch callers which still
511 * pass 'false'.
512 */
513 TALLOC_FREE(frame);
514 return EINVAL;
515 }
516
517 upper_realm = strupper_talloc(frame, realm);
518 if (upper_realm == NULL) {
519 TALLOC_FREE(frame);
520 return ENOMEM;
521 }
522
523 /* Many, many thanks to lukeh@padl.com for this
524 * algorithm, described in his Nov 10 2004 mail to
525 * samba-technical@lists.samba.org */
526
527 /*
528 * Determine a salting principal
529 */
530 if (uac_flags & UF_TRUST_ACCOUNT_MASK) {
531 int computer_len = 0;
532
533 computer_len = strlen(sAMAccountName);
534 if (sAMAccountName[computer_len-1] == '$') {
535 computer_len -= 1;
536 }
537
538 if (uac_flags & UF_INTERDOMAIN_TRUST_ACCOUNT) {
539 const char *krbtgt = "krbtgt";
540 krb5_ret = krb5_build_principal_ext(krb5_ctx,
541 salt_princ,
542 strlen(upper_realm),
543 upper_realm,
544 strlen(krbtgt),
545 krbtgt,
546 computer_len,
547 sAMAccountName,
548 0);
549 if (krb5_ret != 0) {
550 TALLOC_FREE(frame);
551 return krb5_ret;
552 }
553 } else {
554 const char *host = "host";
555 char *tmp = NULL;
556 char *tmp_lower = NULL;
557
558 tmp = talloc_asprintf(frame, "%*.*s.%s",
559 computer_len,
560 computer_len,
561 sAMAccountName,
562 realm);
563 if (tmp == NULL) {
564 TALLOC_FREE(frame);
565 return ENOMEM;
566 }
567
568 tmp_lower = strlower_talloc(frame, tmp);
569 if (tmp_lower == NULL) {
570 TALLOC_FREE(frame);
571 return ENOMEM;
572 }
573
574 krb5_ret = krb5_build_principal_ext(krb5_ctx,
575 salt_princ,
576 strlen(upper_realm),
577 upper_realm,
578 strlen(host),
579 host,
580 strlen(tmp_lower),
581 tmp_lower,
582 0);
583 if (krb5_ret != 0) {
584 TALLOC_FREE(frame);
585 return krb5_ret;
586 }
587 }
588
589 } else if (userPrincipalName != NULL) {
590 /*
591 * We parse the name not only to allow an easy
592 * replacement of the realm (no matter the realm in
593 * the UPN, the salt comes from the upper-case real
594 * realm, but also to correctly provide a salt when
595 * the UPN is host/foo.bar
596 *
597 * This can fail for a UPN of the form foo@bar@REALM
598 * (which is accepted by windows) however.
599 */
600 krb5_ret = krb5_parse_name(krb5_ctx,
601 userPrincipalName,
602 salt_princ);
603
604 if (krb5_ret != 0) {
605 TALLOC_FREE(frame);
606 return krb5_ret;
607 }
608
609 /*
610 * No matter what realm (including none) in the UPN,
611 * the realm is replaced with our upper-case realm
612 */
613 krb5_ret = smb_krb5_principal_set_realm(krb5_ctx,
614 *salt_princ,
615 upper_realm);
616 if (krb5_ret != 0) {
617 krb5_free_principal(krb5_ctx, *salt_princ);
618 TALLOC_FREE(frame);
619 return krb5_ret;
620 }
621 } else {
622 principal = sAMAccountName;
623 principal_len = strlen(principal);
624
625 krb5_ret = krb5_build_principal_ext(krb5_ctx,
626 salt_princ,
627 strlen(upper_realm),
628 upper_realm,
629 principal_len,
630 principal,
631 0);
632 if (krb5_ret != 0) {
633 TALLOC_FREE(frame);
634 return krb5_ret;
635 }
636 }
637
638 TALLOC_FREE(frame);
639 return 0;
640 }
641
642 /**
643 * @brief This constructs the salt principal used by active directory
644 *
645 * Most Kerberos encryption types require a salt in order to
646 * calculate the long term private key for user/computer object
647 * based on a password.
648 *
649 * The returned _salt_principal is a string in forms like this:
650 * - host/somehost.example.com@EXAMPLE.COM
651 * - SomeAccount@EXAMPLE.COM
652 * - SomePrincipal@EXAMPLE.COM
653 *
654 * This is not the form that's used as salt, it's just
655 * the human readable form. It needs to be converted by
656 * smb_krb5_salt_principal2data().
657 *
658 * @param[in] realm The realm the user/computer is added too.
659 *
660 * @param[in] sAMAccountName The sAMAccountName attribute of the object.
661 *
662 * @param[in] userPrincipalName The userPrincipalName attribute of the object
663 * or NULL if not available.
664 *
665 * @param[in] uac_flags UF_ACCOUNT_TYPE_MASKed userAccountControl field
666 *
667 * @param[in] mem_ctx The TALLOC_CTX to allocate _salt_principal.
668 *
669 * @param[out] _salt_principal The resulting principal as string.
670 *
671 * @retval 0 Success; otherwise - Kerberos error codes
672 *
673 * @see smb_krb5_salt_principal2data
674 */
675 int smb_krb5_salt_principal_str(const char *realm,
676 const char *sAMAccountName,
677 const char *userPrincipalName,
678 uint32_t uac_flags,
679 TALLOC_CTX *mem_ctx,
680 char **_salt_principal_str)
681 {
682 krb5_principal salt_principal = NULL;
683 char *salt_principal_malloc;
684 krb5_context krb5_ctx;
685 krb5_error_code krb5_ret
686 = smb_krb5_init_context_common(&krb5_ctx);
687 if (krb5_ret != 0) {
688 DBG_ERR("kerberos init context failed (%s)\n",
689 error_message(krb5_ret));
690 return krb5_ret;
691 }
692
693 krb5_ret = smb_krb5_salt_principal(krb5_ctx,
694 realm,
695 sAMAccountName,
696 userPrincipalName,
697 uac_flags,
698 &salt_principal);
699 if (krb5_ret != 0) {
700 DBG_ERR("unable to create salt principal:%s\n",
701 error_message(krb5_ret));
702 return krb5_ret;
703 }
704
705 krb5_ret = krb5_unparse_name(krb5_ctx, salt_principal,
706 &salt_principal_malloc);
707 if (krb5_ret != 0) {
708 krb5_free_principal(krb5_ctx, salt_principal);
709 DBG_ERR("kerberos unparse of salt principal failed (%s)\n",
710 error_message(krb5_ret));
711 return krb5_ret;
712 }
713 krb5_free_principal(krb5_ctx, salt_principal);
714 *_salt_principal_str
715 = talloc_strdup(mem_ctx, salt_principal_malloc);
716 krb5_free_unparsed_name(krb5_ctx, salt_principal_malloc);
717
718 if (*_salt_principal_str == NULL) {
719 return ENOMEM;
720 }
721 return 0;
722 }
723
724 /**
725 * @brief Converts the salt principal string into the salt data blob
726 *
727 * This function takes a salt_principal as string in forms like this:
728 * - host/somehost.example.com@EXAMPLE.COM
729 * - SomeAccount@EXAMPLE.COM
730 * - SomePrincipal@EXAMPLE.COM
731 *
732 * It generates values like:
733 * - EXAMPLE.COMhost/somehost.example.com
734 * - EXAMPLE.COMSomeAccount
735 * - EXAMPLE.COMSomePrincipal
736 *
737 * @param[in] realm The realm the user/computer is added too.
738 *
739 * @param[in] sAMAccountName The sAMAccountName attribute of the object.
740 *
741 * @param[in] userPrincipalName The userPrincipalName attribute of the object
742 * or NULL if not available.
743 *
744 * @param[in] is_computer The indication of the object includes
745 * objectClass=computer.
746 *
747 * @param[in] mem_ctx The TALLOC_CTX to allocate _salt_principal.
748 *
749 * @param[out] _salt_principal The resulting principal as string.
750 *
751 * @retval 0 Success; otherwise - Kerberos error codes
752 *
753 * @see smb_krb5_salt_principal
754 */
755 int smb_krb5_salt_principal2data(krb5_context context,
756 const char *salt_principal,
757 TALLOC_CTX *mem_ctx,
758 char **_salt_data)
759 {
760 krb5_error_code ret;
761 krb5_principal salt_princ = NULL;
762 krb5_data salt;
763
764 *_salt_data = NULL;
765
766 ret = krb5_parse_name(context, salt_principal, &salt_princ);
767 if (ret != 0) {
768 return ret;
769 }
770
771 ret = smb_krb5_get_pw_salt(context, salt_princ, &salt);
772 krb5_free_principal(context, salt_princ);
773 if (ret != 0) {
774 return ret;
775 }
776
777 *_salt_data = talloc_strndup(mem_ctx,
778 (char *)salt.data,
779 salt.length);
780 smb_krb5_free_data_contents(context, &salt);
781 if (*_salt_data == NULL) {
782 return ENOMEM;
783 }
784
785 return 0;
786 }
787
788 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
789 /**
790 * @brief Get a list of encryption types allowed for session keys
791 *
792 * @param[in] context The library context
793 *
794 * @param[in] enctypes An allocated, zero-terminated list of encryption types
795 *
796 * This function returns an allocated list of encryption types allowed for
797 * session keys.
798 *
799 * Use krb5_free_enctypes() to free the enctypes when it is no longer needed.
800 *
801 * @retval 0 Success; otherwise - Kerberos error codes
802 */
803 krb5_error_code smb_krb5_get_allowed_etypes(krb5_context context,
804 krb5_enctype **enctypes)
805 {
806 return krb5_get_permitted_enctypes(context, enctypes);
807 }
808 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
809 krb5_error_code smb_krb5_get_allowed_etypes(krb5_context context,
810 krb5_enctype **enctypes)
811 {
812 #ifdef HAVE_KRB5_PDU_NONE_DECL
813 return krb5_get_default_in_tkt_etypes(context, KRB5_PDU_NONE, enctypes);
814 #else
815 return krb5_get_default_in_tkt_etypes(context, enctypes);
816 #endif
817 }
818 #else
819 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
820 #endif
821
822
823 /**
824 * @brief Convert a string principal name to a Kerberos principal.
825 *
826 * @param[in] context The library context
827 *
828 * @param[in] name The principal as a unix charset string.
829 *
830 * @param[out] principal The newly allocated principal.
831 *
832 * Use krb5_free_principal() to free a principal when it is no longer needed.
833 *
834 * @return 0 on success, a Kerberos error code otherwise.
835 */
836 krb5_error_code smb_krb5_parse_name(krb5_context context,
837 const char *name,
838 krb5_principal *principal)
839 {
840 krb5_error_code ret;
841 char *utf8_name;
842 size_t converted_size;
843 TALLOC_CTX *frame = talloc_stackframe();
844
845 if (!push_utf8_talloc(frame, &utf8_name, name, &converted_size)) {
846 talloc_free(frame);
847 return ENOMEM;
848 }
849
850 ret = krb5_parse_name(context, utf8_name, principal);
851 if (ret == KRB5_PARSE_MALFORMED) {
852 ret = krb5_parse_name_flags(context, utf8_name,
853 KRB5_PRINCIPAL_PARSE_ENTERPRISE,
854 principal);
855 }
856 TALLOC_FREE(frame);
857 return ret;
858 }
859
860 /**
861 * @brief Convert a Kerberos principal structure to a string representation.
862 *
863 * The resulting string representation will be a unix charset name and is
864 * talloc'ed.
865 *
866 * @param[in] mem_ctx The talloc context to allocate memory on.
867 *
868 * @param[in] context The library context.
869 *
870 * @param[in] principal The principal.
871 *
872 * @param[out] unix_name A string representation of the principal name as with
873 * unix charset.
874 *
875 * Use talloc_free() to free the string representation if it is no longer
876 * needed.
877 *
878 * @return 0 on success, a Kerberos error code otherwise.
879 */
880 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
881 krb5_context context,
882 krb5_const_principal principal,
883 char **unix_name)
884 {
885 krb5_error_code ret;
886 char *utf8_name;
887 size_t converted_size;
888
889 *unix_name = NULL;
890 ret = krb5_unparse_name(context, principal, &utf8_name);
891 if (ret) {
892 return ret;
893 }
894
895 if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
896 krb5_free_unparsed_name(context, utf8_name);
897 return ENOMEM;
898 }
899 krb5_free_unparsed_name(context, utf8_name);
900 return 0;
901 }
902
903 /**
904 * @brief Free the contents of a krb5_data structure and zero the data field.
905 *
906 * @param[in] context The krb5 context
907 *
908 * @param[in] pdata The data structure to free contents of
909 *
910 * This function frees the contents, not the structure itself.
911 */
912 void smb_krb5_free_data_contents(krb5_context context, krb5_data *pdata)
913 {
914 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
915 if (pdata->data) {
916 krb5_free_data_contents(context, pdata);
917 }
918 #elif defined(HAVE_KRB5_DATA_FREE)
919 krb5_data_free(context, pdata);
920 #else
921 SAFE_FREE(pdata->data);
922 #endif
923 }
924
925 /*
926 * @brief copy a buffer into a krb5_data struct
927 *
928 * @param[in] p The krb5_data
929 * @param[in] data The data to copy
930 * @param[in] length The length of the data to copy
931 * @return krb5_error_code
932 *
933 * Caller has to free krb5_data with smb_krb5_free_data_contents().
934 */
935 krb5_error_code smb_krb5_copy_data_contents(krb5_data *p,
936 const void *data,
937 size_t len)
938 {
939 #if defined(HAVE_KRB5_DATA_COPY)
940 return krb5_data_copy(p, data, len);
941 #else
942 if (len) {
943 p->data = malloc(len);
944 if (p->data == NULL) {
945 return ENOMEM;
946 }
947 memmove(p->data, data, len);
948 } else {
949 p->data = NULL;
950 }
951 p->length = len;
952 p->magic = KV5M_DATA;
953 return 0;
954 #endif
955 }
956
957 /*
958 * @brief put a buffer reference into a krb5_data struct
959 *
960 * @param[in] data The data to reference
961 * @param[in] length The length of the data to reference
962 * @return krb5_data
963 *
964 * Caller should not free krb5_data.
965 */
966 krb5_data smb_krb5_make_data(void *data,
967 size_t len)
968 {
969 krb5_data d;
970
971 #ifdef SAMBA4_USES_HEIMDAL
972 d.data = (uint8_t *)data;
973 d.length = len;
974 #else
975 d.magic = KV5M_DATA;
976 d.data = data;
977 d.length = len;
978 #endif
979 return d;
980 }
981
982 krb5_data smb_krb5_data_from_blob(DATA_BLOB blob)
983 {
984 return smb_krb5_make_data(blob.data, blob.length);
985 }
986
987 bool smb_krb5_get_smb_session_key(TALLOC_CTX *mem_ctx,
988 krb5_context context,
989 krb5_auth_context auth_context,
990 DATA_BLOB *session_key,
991 bool remote)
992 {
993 krb5_keyblock *skey = NULL;
994 krb5_error_code err = 0;
995 bool ret = false;
996
997 if (remote) {
998 #ifdef HAVE_KRB5_AUTH_CON_GETRECVSUBKEY
999 err = krb5_auth_con_getrecvsubkey(context,
1000 auth_context,
1001 &skey);
1002 #else /* HAVE_KRB5_AUTH_CON_GETRECVSUBKEY */
1003 err = krb5_auth_con_getremotesubkey(context,
1004 auth_context, &skey);
1005 #endif /* HAVE_KRB5_AUTH_CON_GETRECVSUBKEY */
1006 } else {
1007 #ifdef HAVE_KRB5_AUTH_CON_GETSENDSUBKEY
1008 err = krb5_auth_con_getsendsubkey(context,
1009 auth_context,
1010 &skey);
1011 #else /* HAVE_KRB5_AUTH_CON_GETSENDSUBKEY */
1012 err = krb5_auth_con_getlocalsubkey(context,
1013 auth_context, &skey);
1014 #endif /* HAVE_KRB5_AUTH_CON_GETSENDSUBKEY */
1015 }
1016
1017 if (err || skey == NULL) {
1018 DEBUG(10, ("KRB5 error getting session key %d\n", err));
1019 goto done;
1020 }
1021
1022 DEBUG(10, ("Got KRB5 session key of length %d\n",
1023 (int)KRB5_KEY_LENGTH(skey)));
1024
1025 *session_key = data_blob_talloc(mem_ctx,
1026 KRB5_KEY_DATA(skey),
1027 KRB5_KEY_LENGTH(skey));
1028 dump_data_pw("KRB5 Session Key:\n",
1029 session_key->data,
1030 session_key->length);
1031
1032 ret = true;
1033
1034 done:
1035 if (skey) {
1036 krb5_free_keyblock(context, skey);
1037 }
1038
1039 return ret;
1040 }
1041
1042
1043 /**
1044 * @brief Get talloced string component of a principal
1045 *
1046 * @param[in] mem_ctx The TALLOC_CTX
1047 * @param[in] context The krb5_context
1048 * @param[in] principal The principal
1049 * @param[in] component The component
1050 * @param[out] out The output string
1051 * @return krb5_error_code
1052 *
1053 * Caller must talloc_free if the return value is not NULL.
1054 *
1055 */
1056 krb5_error_code smb_krb5_principal_get_comp_string(TALLOC_CTX *mem_ctx,
1057 krb5_context context,
1058 krb5_const_principal principal,
1059 unsigned int component,
1060 char **out)
1061 {
1062 char *out_str = NULL;
1063 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING)
1064 const char *str = NULL;
1065
1066 str = krb5_principal_get_comp_string(context, principal, component);
1067 if (str == NULL) {
1068 return ENOENT;
1069 }
1070
1071 out_str = talloc_strdup(mem_ctx, str);
1072 if (out_str == NULL) {
1073 return ENOMEM;
1074 }
1075 #else
1076 krb5_data *data;
1077
1078 if (component >= krb5_princ_size(context, principal)) {
1079 return ENOENT;
1080 }
1081
1082 data = krb5_princ_component(context, principal, component);
1083 if (data == NULL) {
1084 return ENOENT;
1085 }
1086
1087 out_str = talloc_strndup(mem_ctx, data->data, data->length);
1088 if (out_str == NULL) {
1089 return ENOMEM;
1090 }
1091 #endif
1092 *out = out_str;
1093 return 0;
1094 }
1095
1096 /**
1097 * @brief
1098 *
1099 * @param[in] ccache_string A string pointing to the cache to renew the ticket
1100 * (e.g. FILE:/tmp/krb5cc_0) or NULL. If the principal
1101 * ccache has not been specified, the default ccache
1102 * will be used.
1103 *
1104 * @param[in] client_string The client principal string (e.g. user@SAMBA.SITE)
1105 * or NULL. If the principal string has not been
1106 * specified, the principal from the ccache will be
1107 * retrieved.
1108 *
1109 * @param[in] service_string The service ticket string
1110 * (e.g. krbtgt/SAMBA.SITE@SAMBA.SITE) or NULL. If
1111 * the service ticket is specified, it is parsed
1112 * (with the realm part ignored) and used as the
1113 * server principal of the credential. Otherwise
1114 * the ticket-granting service is used.
1115 *
1116 * @param[in] expire_time A pointer to store the credentials end time or
1117 * NULL.
1118 *
1119 * @return 0 on Success, a Kerberos error code otherwise.
1120 */
1121 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,
1122 const char *client_string,
1123 const char *service_string,
1124 time_t *expire_time)
1125 {
1126 krb5_error_code ret;
1127 krb5_context context = NULL;
1128 krb5_ccache ccache = NULL;
1129 krb5_principal client = NULL;
1130 krb5_creds creds, creds_in;
1131
1132 ZERO_STRUCT(creds);
1133 ZERO_STRUCT(creds_in);
1134
1135 ret = smb_krb5_init_context_common(&context);
1136 if (ret) {
1137 DBG_ERR("kerberos init context failed (%s)\n",
1138 error_message(ret));
1139 goto done;
1140 }
1141
1142 if (!ccache_string) {
1143 ccache_string = krb5_cc_default_name(context);
1144 }
1145
1146 if (!ccache_string) {
1147 ret = EINVAL;
1148 goto done;
1149 }
1150
1151 DBG_DEBUG("Using %s as ccache for client '%s' and service '%s'\n",
1152 ccache_string, client_string, service_string);
1153
1154 /* FIXME: we should not fall back to defaults */
1155 ret = krb5_cc_resolve(context, discard_const_p(char, ccache_string), &ccache);
1156 if (ret) {
1157 goto done;
1158 }
1159
1160 if (client_string) {
1161 ret = smb_krb5_parse_name(context, client_string, &client);
1162 if (ret) {
1163 goto done;
1164 }
1165 } else {
1166 ret = krb5_cc_get_principal(context, ccache, &client);
1167 if (ret) {
1168 goto done;
1169 }
1170 }
1171
1172 ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string));
1173 if (ret) {
1174 DBG_DEBUG("krb5_get_renewed_creds using ccache '%s' "
1175 "for client '%s' and service '%s' failed: %s\n",
1176 ccache_string, client_string, service_string,
1177 error_message(ret));
1178 goto done;
1179 }
1180
1181 /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1182 ret = krb5_cc_initialize(context, ccache, client);
1183 if (ret) {
1184 goto done;
1185 }
1186
1187 ret = krb5_cc_store_cred(context, ccache, &creds);
1188
1189 if (expire_time) {
1190 *expire_time = (time_t) creds.times.endtime;
1191 }
1192
1193 done:
1194 krb5_free_cred_contents(context, &creds_in);
1195 krb5_free_cred_contents(context, &creds);
1196
1197 if (client) {
1198 krb5_free_principal(context, client);
1199 }
1200 if (ccache) {
1201 krb5_cc_close(context, ccache);
1202 }
1203 if (context) {
1204 krb5_free_context(context);
1205 }
1206
1207 return ret;
1208 }
1209
1210 /**
1211 * @brief Free the data stored in an smb_krb5_addresses structure.
1212 *
1213 * @param[in] context The library context
1214 *
1215 * @param[in] addr The address structure to free.
1216 *
1217 * @return 0 on success, a Kerberos error code otherwise.
1218 */
1219 krb5_error_code smb_krb5_free_addresses(krb5_context context,
1220 smb_krb5_addresses *addr)
1221 {
1222 krb5_error_code ret = 0;
1223 if (addr == NULL) {
1224 return ret;
1225 }
1226 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1227 krb5_free_addresses(context, addr->addrs);
1228 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1229 ret = krb5_free_addresses(context, addr->addrs);
1230 SAFE_FREE(addr->addrs);
1231 #endif
1232 SAFE_FREE(addr);
1233 addr = NULL;
1234 return ret;
1235 }
1236
1237 #define MAX_NETBIOSNAME_LEN 16
1238
1239 /**
1240 * @brief Add a netbios name to the array of addresses
1241 *
1242 * @param[in] kerb_addr A pointer to the smb_krb5_addresses to add the
1243 * netbios name to.
1244 *
1245 * @param[in] netbios_name The netbios name to add.
1246 *
1247 * @return 0 on success, a Kerberos error code otherwise.
1248 */
1249 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr,
1250 const char *netbios_name)
1251 {
1252 krb5_error_code ret = 0;
1253 char buf[MAX_NETBIOSNAME_LEN];
1254 int len;
1255 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1256 krb5_address **addrs = NULL;
1257 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1258 krb5_addresses *addrs = NULL;
1259 #endif
1260
1261 *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1262 if (*kerb_addr == NULL) {
1263 return ENOMEM;
1264 }
1265
1266 /* temporarily duplicate put_name() code here to avoid dependency
1267 * issues for a 5 lines function */
1268 len = strlen(netbios_name);
1269 memcpy(buf, netbios_name,
1270 (len < MAX_NETBIOSNAME_LEN) ? len : MAX_NETBIOSNAME_LEN - 1);
1271 if (len < MAX_NETBIOSNAME_LEN - 1) {
1272 memset(buf + len, ' ', MAX_NETBIOSNAME_LEN - 1 - len);
1273 }
1274 buf[MAX_NETBIOSNAME_LEN - 1] = 0x20;
1275
1276 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1277 {
1278 int num_addr = 2;
1279
1280 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1281 if (addrs == NULL) {
1282 SAFE_FREE(*kerb_addr);
1283 return ENOMEM;
1284 }
1285
1286 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1287
1288 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1289 if (addrs[0] == NULL) {
1290 SAFE_FREE(addrs);
1291 SAFE_FREE(*kerb_addr);
1292 return ENOMEM;
1293 }
1294
1295 addrs[0]->magic = KV5M_ADDRESS;
1296 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1297 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1298 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1299 if (addrs[0]->contents == NULL) {
1300 SAFE_FREE(addrs[0]);
1301 SAFE_FREE(addrs);
1302 SAFE_FREE(*kerb_addr);
1303 return ENOMEM;
1304 }
1305
1306 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1307
1308 addrs[1] = NULL;
1309 }
1310 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1311 {
1312 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1313 if (addrs == NULL) {
1314 SAFE_FREE(*kerb_addr);
1315 return ENOMEM;
1316 }
1317
1318 memset(addrs, 0, sizeof(krb5_addresses));
1319
1320 addrs->len = 1;
1321 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1322 if (addrs->val == NULL) {
1323 SAFE_FREE(addrs);
1324 SAFE_FREE(*kerb_addr);
1325 return ENOMEM;
1326 }
1327
1328 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1329 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1330 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1331 if (addrs->val[0].address.data == NULL) {
1332 SAFE_FREE(addrs->val);
1333 SAFE_FREE(addrs);
1334 SAFE_FREE(*kerb_addr);
1335 return ENOMEM;
1336 }
1337
1338 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1339 }
1340 #else
1341 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1342 #endif
1343 (*kerb_addr)->addrs = addrs;
1344
1345 return ret;
1346 }
1347
1348 /**
1349 * @brief Get the enctype from a key table entry
1350 *
1351 * @param[in] kt_entry Key table entry to get the enctype from.
1352 *
1353 * @return The enctype from the entry.
1354 */
1355 krb5_enctype smb_krb5_kt_get_enctype_from_entry(krb5_keytab_entry *kt_entry)
1356 {
1357 return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1358 }
1359
1360 /**
1361 * @brief Free the contents of a key table entry.
1362 *
1363 * @param[in] context The library context.
1364 *
1365 * @param[in] kt_entry The key table entry to free the contents of.
1366 *
1367 * @return 0 on success, a Kerberos error code otherwise.
1368 *
1369 * The pointer itself is not freed.
1370 */
1371 krb5_error_code smb_krb5_kt_free_entry(krb5_context context,
1372 krb5_keytab_entry *kt_entry)
1373 {
1374 /* Try krb5_free_keytab_entry_contents first, since
1375 * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
1376 * krb5_kt_free_entry but only has a prototype for the first, while the
1377 * second is considered private.
1378 */
1379 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
1380 return krb5_free_keytab_entry_contents(context, kt_entry);
1381 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
1382 return krb5_kt_free_entry(context, kt_entry);
1383 #else
1384 #error UNKNOWN_KT_FREE_FUNCTION
1385 #endif
1386 }
1387
1388
1389 /**
1390 * @brief Convert an encryption type to a string.
1391 *
1392 * @param[in] context The library context.
1393 *
1394 * @param[in] enctype The encryption type.
1395 *
1396 * @param[in] etype_s A pointer to store the allocated encryption type as a
1397 * string.
1398 *
1399 * @return 0 on success, a Kerberos error code otherwise.
1400 *
1401 * The caller needs to free the allocated string etype_s.
1402 */
1403 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1404 krb5_enctype enctype,
1405 char **etype_s)
1406 {
1407 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1408 return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1409 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1410 char buf[256];
1411 krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1412 if (ret) {
1413 return ret;
1414 }
1415 *etype_s = SMB_STRDUP(buf);
1416 if (!*etype_s) {
1417 return ENOMEM;
1418 }
1419 return ret;
1420 #else
1421 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1422 #endif
1423 }
1424
1425 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1426 #ifndef MAX_KEYTAB_NAME_LEN
1427 #define MAX_KEYTAB_NAME_LEN 1100
1428 #endif
1429
1430 /**
1431 * @brief Open a key table readonly or with readwrite access.
1432 *
1433 * Allows one to use a different keytab than the default one using a relative
1434 * path to the keytab.
1435 *
1436 * @param[in] context The library context
1437 *
1438 * @param[in] keytab_name_req The path to the key table.
1439 *
1440 * @param[in] write_access Open with readwrite access.
1441 *
1442 * @param[in] keytab A pointer to the opened key table.
1443 *
1444 * The keytab pointer should be freed using krb5_kt_close().
1445 *
1446 * @return 0 on success, a Kerberos error code otherwise.
1447 */
1448 krb5_error_code smb_krb5_kt_open_relative(krb5_context context,
1449 const char *keytab_name_req,
1450 bool write_access,
1451 krb5_keytab *keytab)
1452 {
1453 krb5_error_code ret = 0;
1454 TALLOC_CTX *mem_ctx;
1455 char keytab_string[MAX_KEYTAB_NAME_LEN];
1456 char *kt_str = NULL;
1457 bool found_valid_name = false;
1458 const char *pragma = "FILE";
1459 const char *tmp = NULL;
1460
1461 if (!write_access && !keytab_name_req) {
1462 /* caller just wants to read the default keytab readonly, so be it */
1463 return krb5_kt_default(context, keytab);
1464 }
1465
1466 mem_ctx = talloc_init("smb_krb5_kt_open_relative");
1467 if (!mem_ctx) {
1468 return ENOMEM;
1469 }
1470
1471 #ifdef HAVE_WRFILE_KEYTAB
1472 if (write_access) {
1473 pragma = "WRFILE";
1474 }
1475 #endif
1476
1477 if (keytab_name_req) {
1478
1479 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1480 ret = KRB5_CONFIG_NOTENUFSPACE;
1481 goto out;
1482 }
1483
1484 if ((strncmp(keytab_name_req, "WRFILE:", 7) == 0) ||
1485 (strncmp(keytab_name_req, "FILE:", 5) == 0)) {
1486 tmp = keytab_name_req;
1487 goto resolve;
1488 }
1489
1490 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1491 if (!tmp) {
1492 ret = ENOMEM;
1493 goto out;
1494 }
1495
1496 goto resolve;
1497 }
1498
1499 /* we need to handle more complex keytab_strings, like:
1500 * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1501
1502 ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1503 if (ret) {
1504 goto out;
1505 }
1506
1507 DBG_DEBUG("krb5_kt_default_name returned %s\n", keytab_string);
1508
1509 tmp = talloc_strdup(mem_ctx, keytab_string);
1510 if (!tmp) {
1511 ret = ENOMEM;
1512 goto out;
1513 }
1514
1515 if (strncmp(tmp, "ANY:", 4) == 0) {
1516 tmp += 4;
1517 }
1518
1519 memset(&keytab_string, '\0', sizeof(keytab_string));
1520
1521 while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1522 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1523 found_valid_name = true;
1524 tmp = kt_str;
1525 tmp += 7;
1526 }
1527
1528 if (strncmp(kt_str, "FILE:", 5) == 0) {
1529 found_valid_name = true;
1530 tmp = kt_str;
1531 tmp += 5;
1532 }
1533
1534 if (tmp[0] == '/') {
1535 /* Treat as a FILE: keytab definition. */
1536 found_valid_name = true;
1537 }
1538
1539 if (found_valid_name) {
1540 if (tmp[0] != '/') {
1541 ret = KRB5_KT_BADNAME;
1542 goto out;
1543 }
1544
1545 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1546 if (!tmp) {
1547 ret = ENOMEM;
1548 goto out;
1549 }
1550 break;
1551 }
1552 }
1553
1554 if (!found_valid_name) {
1555 ret = KRB5_KT_UNKNOWN_TYPE;
1556 goto out;
1557 }
1558
1559 resolve:
1560 DBG_DEBUG("resolving: %s\n", tmp);
1561 ret = krb5_kt_resolve(context, tmp, keytab);
1562
1563 out:
1564 TALLOC_FREE(mem_ctx);
1565 return ret;
1566 }
1567
1568 /**
1569 * @brief Open a key table readonly or with readwrite access.
1570 *
1571 * Allows one to use a different keytab than the default one. The path needs to be
1572 * an absolute path or an error will be returned.
1573 *
1574 * @param[in] context The library context
1575 *
1576 * @param[in] keytab_name_req The path to the key table.
1577 *
1578 * @param[in] write_access Open with readwrite access.
1579 *
1580 * @param[in] keytab A pointer to the opened key table.
1581 *
1582 * The keytab pointer should be freed using krb5_kt_close().
1583 *
1584 * @return 0 on success, a Kerberos error code otherwise.
1585 */
1586 krb5_error_code smb_krb5_kt_open(krb5_context context,
1587 const char *keytab_name_req,
1588 bool write_access,
1589 krb5_keytab *keytab)
1590 {
1591 int cmp;
1592
1593 if (keytab_name_req == NULL) {
1594 return KRB5_KT_BADNAME;
1595 }
1596
1597 if (keytab_name_req[0] == '/') {
1598 goto open_keytab;
1599 }
1600
1601 cmp = strncmp(keytab_name_req, "FILE:/", 6);
1602 if (cmp == 0) {
1603 goto open_keytab;
1604 }
1605
1606 cmp = strncmp(keytab_name_req, "WRFILE:/", 8);
1607 if (cmp == 0) {
1608 goto open_keytab;
1609 }
1610
1611 DBG_WARNING("ERROR: Invalid keytab name: %s\n", keytab_name_req);
1612
1613 return KRB5_KT_BADNAME;
1614
1615 open_keytab:
1616 return smb_krb5_kt_open_relative(context,
1617 keytab_name_req,
1618 write_access,
1619 keytab);
1620 }
1621
1622 /**
1623 * @brief Get a key table name.
1624 *
1625 * @param[in] mem_ctx The talloc context to use for allocation.
1626 *
1627 * @param[in] context The library context.
1628 *
1629 * @param[in] keytab The key table to get the name from.
1630 *
1631 * @param[in] keytab_name A talloc'ed string of the key table name.
1632 *
1633 * The talloc'ed name string needs to be freed with talloc_free().
1634 *
1635 * @return 0 on success, a Kerberos error code otherwise.
1636 */
1637 krb5_error_code smb_krb5_kt_get_name(TALLOC_CTX *mem_ctx,
1638 krb5_context context,
1639 krb5_keytab keytab,
1640 const char **keytab_name)
1641 {
1642 char keytab_string[MAX_KEYTAB_NAME_LEN];
1643 krb5_error_code ret = 0;
1644
1645 ret = krb5_kt_get_name(context, keytab,
1646 keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1647 if (ret) {
1648 return ret;
1649 }
1650
1651 *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1652 if (!*keytab_name) {
1653 return ENOMEM;
1654 }
1655
1656 return ret;
1657 }
1658
1659 /**
1660 * @brief Seek and delete old entries in a keytab based on the passed
1661 * principal.
1662 *
1663 * @param[in] context The KRB5 context to use.
1664 *
1665 * @param[in] keytab The keytab to operate on.
1666 *
1667 * @param[in] keep_old_kvno Keep the entries with the previous kvno.
1668 *
1669 * @param[in] kvno The kvno to use.
1670 *
1671 * @param[in] enctype_only Only evaluate the enctype argument if true
1672 *
1673 * @param[in] enctype Only search for entries with the specified enctype
1674 *
1675 * @param[in] princ_s The principal as a string to search for.
1676 *
1677 * @param[in] princ The principal as a krb5_principal to search for.
1678 *
1679 * @param[in] flush Whether to flush the complete keytab.
1680 *
1681 * @retval 0 on Success
1682 *
1683 * @return An appropriate KRB5 error code.
1684 */
1685 krb5_error_code smb_krb5_kt_seek_and_delete_old_entries(krb5_context context,
1686 krb5_keytab keytab,
1687 bool keep_old_kvno,
1688 krb5_kvno kvno,
1689 bool enctype_only,
1690 krb5_enctype enctype,
1691 const char *princ_s,
1692 krb5_principal princ,
1693 bool flush)
1694 {
1695 krb5_error_code ret;
1696 krb5_kt_cursor cursor;
1697 krb5_keytab_entry kt_entry;
1698 char *ktprinc = NULL;
1699 krb5_kvno old_kvno = kvno - 1;
1700 TALLOC_CTX *tmp_ctx;
1701
1702 if (flush) {
1703 SMB_ASSERT(!keep_old_kvno);
1704 SMB_ASSERT(!enctype_only);
1705 SMB_ASSERT(princ_s == NULL);
1706 SMB_ASSERT(princ == NULL);
1707 } else {
1708 SMB_ASSERT(princ_s != NULL);
1709 SMB_ASSERT(princ != NULL);
1710 }
1711
1712 ZERO_STRUCT(cursor);
1713 ZERO_STRUCT(kt_entry);
1714
1715 /*
1716 * Start with talloc_new() and only then call krb5_kt_start_seq_get().
1717 * If any of them fails, the cleanup code is simpler.
1718 */
1719 tmp_ctx = talloc_new(NULL);
1720 if (tmp_ctx == NULL) {
1721 return ENOMEM;
1722 }
1723
1724 ret = krb5_kt_start_seq_get(context, keytab, &cursor);
1725 if (ret == KRB5_KT_END || ret == ENOENT ) {
1726 /* no entries */
1727 talloc_free(tmp_ctx);
1728 return 0;
1729 }
1730
1731 DEBUG(3, (__location__ ": Will try to delete old keytab entries\n"));
1732 while (!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) {
1733 bool name_ok = false;
1734 krb5_enctype kt_entry_enctype =
1735 smb_krb5_kt_get_enctype_from_entry(&kt_entry);
1736
1737 if (princ_s != NULL) {
1738 ret = smb_krb5_unparse_name(tmp_ctx, context,
1739 kt_entry.principal,
1740 &ktprinc);
1741 if (ret) {
1742 DEBUG(1, (__location__
1743 ": smb_krb5_unparse_name failed "
1744 "(%s)\n", error_message(ret)));
1745 goto out;
1746 }
1747
1748 #ifdef HAVE_KRB5_KT_COMPARE
1749 name_ok = krb5_kt_compare(context, &kt_entry,
1750 princ, 0, 0);
1751 #else
1752 name_ok = (strcmp(ktprinc, princ_s) == 0);
1753 #endif
1754
1755 if (!name_ok) {
1756 DEBUG(10, (__location__ ": ignoring keytab "
1757 "entry principal %s, kvno = %d\n",
1758 ktprinc, kt_entry.vno));
1759
1760 /* Not a match,
1761 * just free this entry and continue. */
1762 ret = smb_krb5_kt_free_entry(context,
1763 &kt_entry);
1764 ZERO_STRUCT(kt_entry);
1765 if (ret) {
1766 DEBUG(1, (__location__
1767 ": smb_krb5_kt_free_entry "
1768 "failed (%s)\n",
1769 error_message(ret)));
1770 goto out;
1771 }
1772
1773 TALLOC_FREE(ktprinc);
1774 continue;
1775 }
1776
1777 TALLOC_FREE(ktprinc);
1778 }
1779
1780 /*------------------------------------------------------------
1781 * Save the entries with kvno - 1. This is what microsoft does
1782 * to allow people with existing sessions that have kvno - 1
1783 * to still work. Otherwise, when the password for the machine
1784 * changes, all kerberized sessions will 'break' until either
1785 * the client reboots or the client's session key expires and
1786 * they get a new session ticket with the new kvno.
1787 * Some keytab files only store the kvno in 8bits, limit
1788 * the compare accordingly.
1789 */
1790
1791 if (keep_old_kvno && ((kt_entry.vno & 0xff) == (old_kvno & 0xff))) {
1792 DEBUG(5, (__location__ ": Saving previous (kvno %d) "
1793 "entry for principal: %s.\n",
1794 old_kvno,
1795 princ_s != NULL ? princ_s : "UNKNOWN"));
1796 continue;
1797 }
1798
1799 if (enctype_only &&
1800 ((kt_entry.vno & 0xff) == (kvno & 0xff)) &&
1801 (kt_entry_enctype != enctype))
1802 {
1803 DEBUG(5, (__location__ ": Saving entry with kvno [%d] "
1804 "enctype [%d] for principal: %s.\n",
1805 kvno, kt_entry_enctype,
1806 princ_s != NULL ? princ_s : "UNKNOWN"));
1807 continue;
1808 }
1809
1810 DEBUG(5, (__location__ ": Found old entry for principal: %s "
1811 "(kvno %d) - trying to remove it.\n",
1812 princ_s != NULL ? princ_s : "UNKNOWN",
1813 kt_entry.vno));
1814
1815 ret = krb5_kt_end_seq_get(context, keytab, &cursor);
1816 ZERO_STRUCT(cursor);
1817 if (ret) {
1818 DEBUG(1, (__location__ ": krb5_kt_end_seq_get() "
1819 "failed (%s)\n", error_message(ret)));
1820 goto out;
1821 }
1822 ret = krb5_kt_remove_entry(context, keytab, &kt_entry);
1823 if (ret) {
1824 DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
1825 "failed (%s)\n", error_message(ret)));
1826 goto out;
1827 }
1828
1829 DEBUG(5, (__location__ ": removed old entry for principal: "
1830 "%s (kvno %d).\n",
1831 princ_s != NULL ? princ_s : "UNKNOWN",
1832 kt_entry.vno));
1833
1834 ret = krb5_kt_start_seq_get(context, keytab, &cursor);
1835 if (ret) {
1836 DEBUG(1, (__location__ ": krb5_kt_start_seq() failed "
1837 "(%s)\n", error_message(ret)));
1838 goto out;
1839 }
1840 ret = smb_krb5_kt_free_entry(context, &kt_entry);
1841 ZERO_STRUCT(kt_entry);
1842 if (ret) {
1843 DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
1844 "failed (%s)\n", error_message(ret)));
1845 goto out;
1846 }
1847 }
1848
1849 out:
1850 talloc_free(tmp_ctx);
1851 if (!all_zero((uint8_t *)&kt_entry, sizeof(kt_entry))) {
1852 smb_krb5_kt_free_entry(context, &kt_entry);
1853 }
1854 if (!all_zero((uint8_t *)&cursor, sizeof(cursor))) {
1855 krb5_kt_end_seq_get(context, keytab, &cursor);
1856 }
1857 return ret;
1858 }
1859
1860 /**
1861 * @brief Add a keytab entry for the given principal
1862 *
1863 * @param[in] context The krb5 context to use.
1864 *
1865 * @param[in] keytab The keytab to add the entry to.
1866 *
1867 * @param[in] kvno The kvno to use.
1868 *
1869 * @param[in] princ_s The principal as a string.
1870 *
1871 * @param[in] salt_principal The salt principal to salt the password with.
1872 * Only needed for keys which support salting.
1873 * If no salt is used set no_salt to false and
1874 * pass NULL here.
1875 *
1876 * @param[in] enctype The encryption type of the keytab entry.
1877 *
1878 * @param[in] password The password of the keytab entry.
1879 *
1880 * @param[in] no_salt If the password should not be salted. Normally
1881 * this is only set to false for encryption types
1882 * which do not support salting like RC4.
1883 *
1884 * @retval 0 on Success
1885 *
1886 * @return A corresponding KRB5 error code.
1887 *
1888 * @see smb_krb5_kt_open()
1889 */
1890 krb5_error_code smb_krb5_kt_add_entry(krb5_context context,
1891 krb5_keytab keytab,
1892 krb5_kvno kvno,
1893 const char *princ_s,
1894 const char *salt_principal,
1895 krb5_enctype enctype,
1896 krb5_data *password,
1897 bool no_salt)
1898 {
1899 krb5_error_code ret;
1900 krb5_keytab_entry kt_entry;
1901 krb5_principal princ = NULL;
1902 krb5_keyblock *keyp;
1903
1904 ZERO_STRUCT(kt_entry);
1905
1906 ret = smb_krb5_parse_name(context, princ_s, &princ);
1907 if (ret) {
1908 DEBUG(1, (__location__ ": smb_krb5_parse_name(%s) "
1909 "failed (%s)\n", princ_s, error_message(ret)));
1910 goto out;
1911 }
1912
1913 /* Seek and delete old keytab entries */
1914 ret = smb_krb5_kt_seek_and_delete_old_entries(context,
1915 keytab,
1916 true, /* keep_old_kvno */
1917 kvno,
1918 true, /* enctype_only */
1919 enctype,
1920 princ_s,
1921 princ,
1922 false); /* flush */
1923 if (ret) {
1924 goto out;
1925 }
1926
1927 /* If we get here, we have deleted all the old entries with kvno's
1928 * not equal to the current kvno-1. */
1929
1930 keyp = KRB5_KT_KEY(&kt_entry);
1931
1932 if (no_salt) {
1933 KRB5_KEY_DATA(keyp) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
1934 if (KRB5_KEY_DATA(keyp) == NULL) {
1935 ret = ENOMEM;
1936 goto out;
1937 }
1938 memcpy(KRB5_KEY_DATA(keyp), password->data, password->length);
1939 KRB5_KEY_LENGTH(keyp) = password->length;
1940 KRB5_KEY_TYPE(keyp) = enctype;
1941 } else {
1942 krb5_principal salt_princ = NULL;
1943
1944 /* Now add keytab entries for all encryption types */
1945 ret = smb_krb5_parse_name(context, salt_principal, &salt_princ);
1946 if (ret) {
1947 DBG_WARNING("krb5_parse_name(%s) failed (%s)\n",
1948 salt_principal, error_message(ret));
1949 goto out;
1950 }
1951
1952 ret = smb_krb5_create_key_from_string(context,
1953 salt_princ,
1954 NULL,
1955 password,
1956 enctype,
1957 keyp);
1958 krb5_free_principal(context, salt_princ);
1959 if (ret != 0) {
1960 goto out;
1961 }
1962 }
1963
1964 kt_entry.principal = princ;
1965 kt_entry.vno = kvno;
1966
1967 DEBUG(3, (__location__ ": adding keytab entry for (%s) with "
1968 "encryption type (%d) and version (%d)\n",
1969 princ_s, enctype, kt_entry.vno));
1970 ret = krb5_kt_add_entry(context, keytab, &kt_entry);
1971 krb5_free_keyblock_contents(context, keyp);
1972 ZERO_STRUCT(kt_entry);
1973 if (ret) {
1974 DEBUG(1, (__location__ ": adding entry to keytab "
1975 "failed (%s)\n", error_message(ret)));
1976 goto out;
1977 }
1978
1979 out:
1980 if (princ) {
1981 krb5_free_principal(context, princ);
1982 }
1983
1984 return ret;
1985 }
1986
1987 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1988 defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1989 defined(HAVE_KRB5_GET_CREDS)
1990 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1991 krb5_ccache ccache,
1992 krb5_principal me,
1993 krb5_principal server,
1994 krb5_principal impersonate_princ,
1995 krb5_creds **out_creds)
1996 {
1997 krb5_error_code ret;
1998 krb5_get_creds_opt opt;
1999
2000 ret = krb5_get_creds_opt_alloc(context, &opt);
2001 if (ret) {
2002 goto done;
2003 }
2004 krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
2005
2006 if (impersonate_princ) {
2007 ret = krb5_get_creds_opt_set_impersonate(context, opt,
2008 impersonate_princ);
2009 if (ret) {
2010 goto done;
2011 }
2012 }
2013
2014 ret = krb5_get_creds(context, opt, ccache, server, out_creds);
2015 if (ret) {
2016 goto done;
2017 }
2018
2019 done:
2020 if (opt) {
2021 krb5_get_creds_opt_free(context, opt);
2022 }
2023 return ret;
2024 }
2025 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
2026
2027 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
2028
2029 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
2030 krb5_error_code KRB5_CALLCONV
2031 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
2032 krb5_ccache ccache, krb5_creds *in_creds,
2033 krb5_data *subject_cert,
2034 krb5_creds **out_creds);
2035 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
2036
2037 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
2038 krb5_ccache ccache,
2039 krb5_principal me,
2040 krb5_principal server,
2041 krb5_principal impersonate_princ,
2042 krb5_creds **out_creds)
2043 {
2044 krb5_error_code ret;
2045 krb5_creds in_creds;
2046
2047 ZERO_STRUCT(in_creds);
2048
2049 if (impersonate_princ) {
2050
2051 in_creds.server = me;
2052 in_creds.client = impersonate_princ;
2053
2054 ret = krb5_get_credentials_for_user(context,
2055 0, /* krb5_flags options */
2056 ccache,
2057 &in_creds,
2058 NULL, /* krb5_data *subject_cert */
2059 out_creds);
2060 } else {
2061 in_creds.client = me;
2062 in_creds.server = server;
2063
2064 ret = krb5_get_credentials(context, 0, ccache,
2065 &in_creds, out_creds);
2066 }
2067
2068 return ret;
2069 }
2070 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
2071
2072 /*
2073 * smb_krb5_get_credentials
2074 *
2075 * @brief Get krb5 credentials for a server
2076 *
2077 * @param[in] context An initialized krb5_context
2078 * @param[in] ccache An initialized krb5_ccache
2079 * @param[in] me The krb5_principal of the caller
2080 * @param[in] server The krb5_principal of the requested service
2081 * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
2082 * @param[out] out_creds The returned krb5_creds structure
2083 * @return krb5_error_code
2084 *
2085 */
2086 krb5_error_code smb_krb5_get_credentials(krb5_context context,
2087 krb5_ccache ccache,
2088 krb5_principal me,
2089 krb5_principal server,
2090 krb5_principal impersonate_princ,
2091 krb5_creds **out_creds)
2092 {
2093 krb5_error_code ret;
2094 krb5_creds *creds = NULL;
2095
2096 if (out_creds != NULL) {
2097 *out_creds = NULL;
2098 }
2099
2100 if (impersonate_princ) {
2101 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
2102 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
2103 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
2104 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
2105 #else
2106 ret = ENOTSUP;
2107 #endif
2108 } else {
2109 krb5_creds in_creds;
2110
2111 ZERO_STRUCT(in_creds);
2112
2113 in_creds.client = me;
2114 in_creds.server = server;
2115
2116 ret = krb5_get_credentials(context, 0, ccache,
2117 &in_creds, &creds);
2118 }
2119 if (ret) {
2120 goto done;
2121 }
2122
2123 if (out_creds) {
2124 *out_creds = creds;
2125 }
2126
2127 done:
2128 if (creds && ret) {
2129 krb5_free_creds(context, creds);
2130 }
2131
2132 return ret;
2133 }
2134
2135 /**
2136 * @brief Initialize a krb5_keyblock with the given data.
2137 *
2138 * Initializes a new keyblock, allocates the contents for the key and
2139 * copies the data into the keyblock.
2140 *
2141 * @param[in] context The library context
2142 *
2143 * @param[in] enctype The encryption type.
2144 *
2145 * @param[in] data The date to initialize the keyblock with.
2146 *
2147 * @param[in] length The length of the keyblock.
2148 *
2149 * @param[in] key Newly allocated keyblock structure.
2150 *
2151 * The key date must be freed using krb5_free_keyblock_contents() when it is
2152 * no longer needed.
2153 *
2154 * @return 0 on success, a Kerberos error code otherwise.
2155 */
2156 krb5_error_code smb_krb5_keyblock_init_contents(krb5_context context,
2157 krb5_enctype enctype,
2158 const void *data,
2159 size_t length,
2160 krb5_keyblock *key)
2161 {
2162 #if defined(HAVE_KRB5_KEYBLOCK_INIT)
2163 return krb5_keyblock_init(context, enctype, data, length, key);
2164 #else
2165 memset(key, 0, sizeof(krb5_keyblock));
2166 KRB5_KEY_DATA(key) = SMB_MALLOC(length);
2167 if (NULL == KRB5_KEY_DATA(key)) {
2168 return ENOMEM;
2169 }
2170 memcpy(KRB5_KEY_DATA(key), data, length);
2171 KRB5_KEY_LENGTH(key) = length;
2172 KRB5_KEY_TYPE(key) = enctype;
2173 return 0;
2174 #endif
2175 }
2176
2177 /**
2178 * @brief Simulate a kinit by putting the tgt in the given credential cache.
2179 *
2180 * This function uses a keyblock rather than needing the original password.
2181 *
2182 * @param[in] ctx The library context
2183 *
2184 * @param[in] cc The credential cache to put the tgt in.
2185 *
2186 * @param[in] principal The client princial
2187 *
2188 * @param[in] keyblock The keyblock to use.
2189 *
2190 * @param[in] target_service The service name of the initial credentials (or NULL).
2191 *
2192 * @param[in] krb_options Initial credential options.
2193 *
2194 * @param[in] expire_time A pointer to store the expiration time of the
2195 * credentials (or NULL).
2196 *
2197 * @param[in] kdc_time A pointer to store the time when the ticket becomes
2198 * valid (or NULL).
2199 *
2200 * @return 0 on success, a Kerberos error code otherwise.
2201 */
2202 krb5_error_code smb_krb5_kinit_keyblock_ccache(krb5_context ctx,
2203 krb5_ccache cc,
2204 krb5_principal principal,
2205 krb5_keyblock *keyblock,
2206 const char *target_service,
2207 krb5_get_init_creds_opt *krb_options,
2208 time_t *expire_time,
2209 time_t *kdc_time)
2210 {
2211 krb5_error_code code = 0;
2212 krb5_creds my_creds;
2213
2214 #if defined(HAVE_KRB5_GET_INIT_CREDS_KEYBLOCK)
2215 code = krb5_get_init_creds_keyblock(ctx, &my_creds, principal,
2216 keyblock, 0, target_service,
2217 krb_options);
2218 #elif defined(HAVE_KRB5_GET_INIT_CREDS_KEYTAB)
2219 {
2220 #define SMB_CREDS_KEYTAB "MEMORY:tmp_kinit_keyblock_ccache"
2221 char tmp_name[64] = {0};
2222 krb5_keytab_entry entry;
2223 krb5_keytab keytab;
2224 int rc;
2225
2226 memset(&entry, 0, sizeof(entry));
2227 entry.principal = principal;
2228 *(KRB5_KT_KEY(&entry)) = *keyblock;
2229
2230 rc = snprintf(tmp_name, sizeof(tmp_name),
2231 "%s-%p",
2232 SMB_CREDS_KEYTAB,
2233 &my_creds);
2234 if (rc < 0) {
2235 return KRB5_KT_BADNAME;
2236 }
2237 code = krb5_kt_resolve(ctx, tmp_name, &keytab);
2238 if (code) {
2239 return code;
2240 }
2241
2242 code = krb5_kt_add_entry(ctx, keytab, &entry);
2243 if (code) {
2244 (void)krb5_kt_close(ctx, keytab);
2245 goto done;
2246 }
2247
2248 code = krb5_get_init_creds_keytab(ctx, &my_creds, principal,
2249 keytab, 0, target_service,
2250 krb_options);
2251 (void)krb5_kt_close(ctx, keytab);
2252 }
2253 #else
2254 #error krb5_get_init_creds_keyblock not available!
2255 #endif
2256 if (code) {
2257 return code;
2258 }
2259
2260 #ifndef SAMBA4_USES_HEIMDAL /* MIT */
2261 /*
2262 * We need to store the principal as returned from the KDC to the
2263 * credentials cache. If we don't do that the KRB5 library is not
2264 * able to find the tickets it is looking for
2265 */
2266 principal = my_creds.client;
2267 #endif
2268 code = krb5_cc_initialize(ctx, cc, principal);
2269 if (code) {
2270 goto done;
2271 }
2272
2273 code = krb5_cc_store_cred(ctx, cc, &my_creds);
2274 if (code) {
2275 goto done;
2276 }
2277
2278 if (expire_time) {
2279 *expire_time = (time_t) my_creds.times.endtime;
2280 }
2281
2282 if (kdc_time) {
2283 *kdc_time = (time_t) my_creds.times.starttime;
2284 }
2285
2286 code = 0;
2287 done:
2288 krb5_free_cred_contents(ctx, &my_creds);
2289 return code;
2290 }
2291
2292 /**
2293 * @brief Simulate a kinit by putting the tgt in the given credential cache.
2294 *
2295 * @param[in] ctx The library context
2296 *
2297 * @param[in] cc The credential cache to put the tgt in.
2298 *
2299 * @param[in] principal The client princial
2300 *
2301 * @param[in] password The password (or NULL).
2302 *
2303 * @param[in] target_service The service name of the initial credentials (or NULL).
2304 *
2305 * @param[in] krb_options Initial credential options.
2306 *
2307 * @param[in] expire_time A pointer to store the expiration time of the
2308 * credentials (or NULL).
2309 *
2310 * @param[in] kdc_time A pointer to store the time when the ticket becomes
2311 * valid (or NULL).
2312 *
2313 * @return 0 on success, a Kerberos error code otherwise.
2314 */
2315 krb5_error_code smb_krb5_kinit_password_ccache(krb5_context ctx,
2316 krb5_ccache cc,
2317 krb5_principal principal,
2318 const char *password,
2319 const char *target_service,
2320 krb5_get_init_creds_opt *krb_options,
2321 time_t *expire_time,
2322 time_t *kdc_time)
2323 {
2324 krb5_error_code code = 0;
2325 krb5_creds my_creds;
2326
2327 code = krb5_get_init_creds_password(ctx, &my_creds, principal,
2328 password, NULL, NULL, 0,
2329 target_service, krb_options);
2330 if (code) {
2331 return code;
2332 }
2333
2334 /*
2335 * We need to store the principal as returned from the KDC to the
2336 * credentials cache. If we don't do that the KRB5 library is not
2337 * able to find the tickets it is looking for
2338 */
2339 principal = my_creds.client;
2340 code = krb5_cc_initialize(ctx, cc, principal);
2341 if (code) {
2342 goto done;
2343 }
2344
2345 code = krb5_cc_store_cred(ctx, cc, &my_creds);
2346 if (code) {
2347 goto done;
2348 }
2349
2350 if (expire_time) {
2351 *expire_time = (time_t) my_creds.times.endtime;
2352 }
2353
2354 if (kdc_time) {
2355 *kdc_time = (time_t) my_creds.times.starttime;
2356 }
2357
2358 code = 0;
2359 done:
2360 krb5_free_cred_contents(ctx, &my_creds);
2361 return code;
2362 }
2363
2364 #ifdef SAMBA4_USES_HEIMDAL
2365 /**
2366 * @brief Simulate a kinit by putting the tgt in the given credential cache.
2367 *
2368 * @param[in] ctx The library context
2369 *
2370 * @param[in] cc The credential cache to store the tgt in.
2371 *
2372 * @param[in] principal The initial client princial.
2373 *
2374 * @param[in] password The password (or NULL).
2375 *
2376 * @param[in] impersonate_principal The impersonation principal (or NULL).
2377 *
2378 * @param[in] self_service The local service for S4U2Self if
2379 * impersonate_principal is specified).
2380 *
2381 * @param[in] target_service The service name of the initial credentials
2382 * (kpasswd/REALM or a remote service). It defaults
2383 * to the krbtgt if NULL.
2384 *
2385 * @param[in] krb_options Initial credential options.
2386 *
2387 * @param[in] expire_time A pointer to store the expiration time of the
2388 * credentials (or NULL).
2389 *
2390 * @param[in] kdc_time A pointer to store the time when the ticket becomes
2391 * valid (or NULL).
2392 *
2393 * @return 0 on success, a Kerberos error code otherwise.
2394 */
2395 krb5_error_code smb_krb5_kinit_s4u2_ccache(krb5_context ctx,
2396 krb5_ccache store_cc,
2397 krb5_principal init_principal,
2398 const char *init_password,
2399 krb5_principal impersonate_principal,
2400 const char *self_service,
2401 const char *target_service,
2402 krb5_get_init_creds_opt *krb_options,
2403 time_t *expire_time,
2404 time_t *kdc_time)
2405 {
2406 krb5_error_code code = 0;
2407 krb5_get_creds_opt options;
2408 krb5_principal store_principal;
2409 krb5_creds store_creds;
2410 krb5_creds *s4u2self_creds;
2411 Ticket s4u2self_ticket;
2412 size_t s4u2self_ticketlen;
2413 krb5_creds *s4u2proxy_creds;
2414 krb5_principal self_princ;
2415 bool s4u2proxy;
2416 krb5_principal target_princ;
2417 krb5_ccache tmp_cc;
2418 const char *self_realm;
2419 const char *client_realm = NULL;
2420 krb5_principal blacklist_principal = NULL;
2421 krb5_principal whitelist_principal = NULL;
2422
2423 code = krb5_get_init_creds_password(ctx, &store_creds,
2424 init_principal,
2425 init_password,
2426 NULL, NULL,
2427 0,
2428 NULL,
2429 krb_options);
2430 if (code != 0) {
2431 return code;
2432 }
2433
2434 store_principal = init_principal;
2435
2436 /*
2437 * We are trying S4U2Self now:
2438 *
2439 * As we do not want to expose our TGT in the
2440 * krb5_ccache, which is also holds the impersonated creds.
2441 *
2442 * Some low level krb5/gssapi function might use the TGT
2443 * identity and let the client act as our machine account.
2444 *
2445 * We need to avoid that and use a temporary krb5_ccache
2446 * in order to pass our TGT to the krb5_get_creds() function.
2447 */
2448 code = krb5_cc_new_unique(ctx, NULL, NULL, &tmp_cc);
2449 if (code != 0) {
2450 krb5_free_cred_contents(ctx, &store_creds);
2451 return code;
2452 }
2453
2454 code = krb5_cc_initialize(ctx, tmp_cc, store_creds.client);
2455 if (code != 0) {
2456 krb5_cc_destroy(ctx, tmp_cc);
2457 krb5_free_cred_contents(ctx, &store_creds);
2458 return code;
2459 }
2460
2461 code = krb5_cc_store_cred(ctx, tmp_cc, &store_creds);
2462 if (code != 0) {
2463 krb5_free_cred_contents(ctx, &store_creds);
2464 krb5_cc_destroy(ctx, tmp_cc);
2465 return code;
2466 }
2467
2468 /*
2469 * we need to remember the client principal of our
2470 * TGT and make sure the KDC does not return this
2471 * in the impersonated tickets. This can happen
2472 * if the KDC does not support S4U2Self and S4U2Proxy.
2473 */
2474 blacklist_principal = store_creds.client;
2475 store_creds.client = NULL;
2476 krb5_free_cred_contents(ctx, &store_creds);
2477
2478 /*
2479 * Check if we also need S4U2Proxy or if S4U2Self is
2480 * enough in order to get a ticket for the target.
2481 */
2482 if (target_service == NULL) {
2483 s4u2proxy = false;
2484 } else if (strcmp(target_service, self_service) == 0) {
2485 s4u2proxy = false;
2486 } else {
2487 s4u2proxy = true;
2488 }
2489
2490 /*
2491 * For S4U2Self we need our own service principal,
2492 * which belongs to our own realm (available on
2493 * our client principal).
2494 */
2495 self_realm = krb5_principal_get_realm(ctx, init_principal);
2496
2497 code = krb5_parse_name(ctx, self_service, &self_princ);
2498 if (code != 0) {
2499 krb5_free_principal(ctx, blacklist_principal);
2500 krb5_cc_destroy(ctx, tmp_cc);
2501 return code;
2502 }
2503
2504 code = krb5_principal_set_realm(ctx, self_princ, self_realm);
2505 if (code != 0) {
2506 krb5_free_principal(ctx, blacklist_principal);
2507 krb5_free_principal(ctx, self_princ);
2508 krb5_cc_destroy(ctx, tmp_cc);
2509 return code;
2510 }
2511
2512 code = krb5_get_creds_opt_alloc(ctx, &options);
2513 if (code != 0) {
2514 krb5_free_principal(ctx, blacklist_principal);
2515 krb5_free_principal(ctx, self_princ);
2516 krb5_cc_destroy(ctx, tmp_cc);
2517 return code;
2518 }
2519
2520 if (s4u2proxy) {
2521 /*
2522 * If we want S4U2Proxy, we need the forwardable flag
2523 * on the S4U2Self ticket.
2524 */
2525 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
2526 }
2527
2528 code = krb5_get_creds_opt_set_impersonate(ctx, options,
2529 impersonate_principal);
2530 if (code != 0) {
2531 krb5_get_creds_opt_free(ctx, options);
2532 krb5_free_principal(ctx, blacklist_principal);
2533 krb5_free_principal(ctx, self_princ);
2534 krb5_cc_destroy(ctx, tmp_cc);
2535 return code;
2536 }
2537
2538 code = krb5_get_creds(ctx, options, tmp_cc,
2539 self_princ, &s4u2self_creds);
2540 krb5_get_creds_opt_free(ctx, options);
2541 krb5_free_principal(ctx, self_princ);
2542 if (code != 0) {
2543 krb5_free_principal(ctx, blacklist_principal);
2544 krb5_cc_destroy(ctx, tmp_cc);
2545 return code;
2546 }
2547
2548 if (!s4u2proxy) {
2549 krb5_cc_destroy(ctx, tmp_cc);
2550
2551 /*
2552 * Now make sure we store the impersonated principal
2553 * and creds instead of the TGT related stuff
2554 * in the krb5_ccache of the caller.
2555 */
2556 code = krb5_copy_creds_contents(ctx, s4u2self_creds,
2557 &store_creds);
2558 krb5_free_creds(ctx, s4u2self_creds);
2559 if (code != 0) {
2560 return code;
2561 }
2562
2563 /*
2564 * It's important to store the principal the KDC
2565 * returned, as otherwise the caller would not find
2566 * the S4U2Self ticket in the krb5_ccache lookup.
2567 */
2568 store_principal = store_creds.client;
2569 goto store;
2570 }
2571
2572 /*
2573 * We are trying S4U2Proxy:
2574 *
2575 * We need the ticket from the S4U2Self step
2576 * and our TGT in order to get the delegated ticket.
2577 */
2578 code = decode_Ticket((const uint8_t *)s4u2self_creds->ticket.data,
2579 s4u2self_creds->ticket.length,
2580 &s4u2self_ticket,
2581 &s4u2self_ticketlen);
2582 if (code != 0) {
2583 krb5_free_creds(ctx, s4u2self_creds);
2584 krb5_free_principal(ctx, blacklist_principal);
2585 krb5_cc_destroy(ctx, tmp_cc);
2586 return code;
2587 }
2588
2589 /*
2590 * we need to remember the client principal of the
2591 * S4U2Self stage and as it needs to match the one we
2592 * will get for the S4U2Proxy stage. We need this
2593 * in order to detect KDCs which does not support S4U2Proxy.
2594 */
2595 whitelist_principal = s4u2self_creds->client;
2596 s4u2self_creds->client = NULL;
2597 krb5_free_creds(ctx, s4u2self_creds);
2598
2599 /*
2600 * For S4U2Proxy we also got a target service principal,
2601 * which also belongs to our own realm (available on
2602 * our client principal).
2603 */
2604 code = krb5_parse_name(ctx, target_service, &target_princ);
2605 if (code != 0) {
2606 free_Ticket(&s4u2self_ticket);
2607 krb5_free_principal(ctx, whitelist_principal);
2608 krb5_free_principal(ctx, blacklist_principal);
2609 krb5_cc_destroy(ctx, tmp_cc);
2610 return code;
2611 }
2612
2613 code = krb5_principal_set_realm(ctx, target_princ, self_realm);
2614 if (code != 0) {
2615 free_Ticket(&s4u2self_ticket);
2616 krb5_free_principal(ctx, target_princ);
2617 krb5_free_principal(ctx, whitelist_principal);
2618 krb5_free_principal(ctx, blacklist_principal);
2619 krb5_cc_destroy(ctx, tmp_cc);
2620 return code;
2621 }
2622
2623 code = krb5_get_creds_opt_alloc(ctx, &options);
2624 if (code != 0) {
2625 free_Ticket(&s4u2self_ticket);
2626 krb5_free_principal(ctx, target_princ);
2627 krb5_free_principal(ctx, whitelist_principal);
2628 krb5_free_principal(ctx, blacklist_principal);
2629 krb5_cc_destroy(ctx, tmp_cc);
2630 return code;
2631 }
2632
2633 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
2634 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_CONSTRAINED_DELEGATION);
2635
2636 code = krb5_get_creds_opt_set_ticket(ctx, options, &s4u2self_ticket);
2637 free_Ticket(&s4u2self_ticket);
2638 if (code != 0) {
2639 krb5_get_creds_opt_free(ctx, options);
2640 krb5_free_principal(ctx, target_princ);
2641 krb5_free_principal(ctx, whitelist_principal);
2642 krb5_free_principal(ctx, blacklist_principal);
2643 krb5_cc_destroy(ctx, tmp_cc);
2644 return code;
2645 }
2646
2647 code = krb5_get_creds(ctx, options, tmp_cc,
2648 target_princ, &s4u2proxy_creds);
2649 krb5_get_creds_opt_free(ctx, options);
2650 krb5_free_principal(ctx, target_princ);
2651 krb5_cc_destroy(ctx, tmp_cc);
2652 if (code != 0) {
2653 krb5_free_principal(ctx, whitelist_principal);
2654 krb5_free_principal(ctx, blacklist_principal);
2655 return code;
2656 }
2657
2658 /*
2659 * Now make sure we store the impersonated principal
2660 * and creds instead of the TGT related stuff
2661 * in the krb5_ccache of the caller.
2662 */
2663 code = krb5_copy_creds_contents(ctx, s4u2proxy_creds,
2664 &store_creds);
2665 krb5_free_creds(ctx, s4u2proxy_creds);
2666 if (code != 0) {
2667 krb5_free_principal(ctx, whitelist_principal);
2668 krb5_free_principal(ctx, blacklist_principal);
2669 return code;
2670 }
2671
2672 /*
2673 * It's important to store the principal the KDC
2674 * returned, as otherwise the caller would not find
2675 * the S4U2Self ticket in the krb5_ccache lookup.
2676 */
2677 store_principal = store_creds.client;
2678
2679 store:
2680 if (blacklist_principal &&
2681 krb5_principal_compare(ctx, store_creds.client, blacklist_principal)) {
2682 char *sp = NULL;
2683 char *ip = NULL;
2684
2685 code = krb5_unparse_name(ctx, blacklist_principal, &sp);
2686 if (code != 0) {
2687 sp = NULL;
2688 }
2689 code = krb5_unparse_name(ctx, impersonate_principal, &ip);
2690 if (code != 0) {
2691 ip = NULL;
2692 }
2693 DBG_WARNING("KDC returned self principal[%s] while impersonating [%s]\n",
2694 sp?sp:"<no memory>",
2695 ip?ip:"<no memory>");
2696
2697 SAFE_FREE(sp);
2698 SAFE_FREE(ip);
2699
2700 krb5_free_principal(ctx, whitelist_principal);
2701 krb5_free_principal(ctx, blacklist_principal);
2702 krb5_free_cred_contents(ctx, &store_creds);
2703 return KRB5_FWD_BAD_PRINCIPAL;
2704 }
2705 if (blacklist_principal) {
2706 krb5_free_principal(ctx, blacklist_principal);
2707 }
2708
2709 if (whitelist_principal &&
2710 !krb5_principal_compare(ctx, store_creds.client, whitelist_principal)) {
2711 char *sp = NULL;
2712 char *ep = NULL;
2713
2714 code = krb5_unparse_name(ctx, store_creds.client, &sp);
2715 if (code != 0) {
2716 sp = NULL;
2717 }
2718 code = krb5_unparse_name(ctx, whitelist_principal, &ep);
2719 if (code != 0) {
2720 ep = NULL;
2721 }
2722 DBG_WARNING("KDC returned wrong principal[%s] we expected [%s]\n",
2723 sp?sp:"<no memory>",
2724 ep?ep:"<no memory>");
2725
2726 SAFE_FREE(sp);
2727 SAFE_FREE(ep);
2728
2729 krb5_free_principal(ctx, whitelist_principal);
2730 krb5_free_cred_contents(ctx, &store_creds);
2731 return KRB5_FWD_BAD_PRINCIPAL;
2732 }
2733 if (whitelist_principal) {
2734 krb5_free_principal(ctx, whitelist_principal);
2735 }
2736
2737 code = krb5_cc_initialize(ctx, store_cc, store_principal);
2738 if (code != 0) {
2739 krb5_free_cred_contents(ctx, &store_creds);
2740 return code;
2741 }
2742
2743 code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
2744 if (code != 0) {
2745 krb5_free_cred_contents(ctx, &store_creds);
2746 return code;
2747 }
2748
2749 client_realm = krb5_principal_get_realm(ctx, store_creds.client);
2750 if (client_realm != NULL) {
2751 /*
2752 * Because the CANON flag doesn't have any impact
2753 * on the impersonate_principal => store_creds.client
2754 * realm mapping. We need to store the credentials twice,
2755 * once with the returned realm and once with the
2756 * realm of impersonate_principal.
2757 */
2758 code = krb5_principal_set_realm(ctx, store_creds.server,
2759 client_realm);
2760 if (code != 0) {
2761 krb5_free_cred_contents(ctx, &store_creds);
2762 return code;
2763 }
2764
2765 code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
2766 if (code != 0) {
2767 krb5_free_cred_contents(ctx, &store_creds);
2768 return code;
2769 }
2770 }
2771
2772 if (expire_time) {
2773 *expire_time = (time_t) store_creds.times.endtime;
2774 }
2775
2776 if (kdc_time) {
2777 *kdc_time = (time_t) store_creds.times.starttime;
2778 }
2779
2780 krb5_free_cred_contents(ctx, &store_creds);
2781
2782 return 0;
2783 }
2784
2785 #else /* MIT */
2786
2787 static bool princ_compare_no_dollar(krb5_context ctx,
2788 krb5_principal a,
2789 krb5_principal b)
2790 {
2791 krb5_principal mod = NULL;
2792 bool cmp;
2793
2794 if (a->length == 1 && b->length == 1 &&
2795 a->data[0].length != 0 && b->data[0].length != 0 &&
2796 a->data[0].data[a->data[0].length - 1] !=
2797 b->data[0].data[b->data[0].length - 1]) {
2798 if (a->data[0].data[a->data[0].length - 1] == '$') {
2799 mod = a;
2800 mod->data[0].length--;
2801 } else if (b->data[0].data[b->data[0].length - 1] == '$') {
2802 mod = b;
2803 mod->data[0].length--;
2804 }
2805 }
2806
2807 cmp = krb5_principal_compare_flags(ctx,
2808 a,
2809 b,
2810 KRB5_PRINCIPAL_COMPARE_CASEFOLD);
2811 if (mod != NULL) {
2812 mod->data[0].length++;
2813 }
2814
2815 return cmp;
2816 }
2817
2818 krb5_error_code smb_krb5_kinit_s4u2_ccache(krb5_context ctx,
2819 krb5_ccache store_cc,
2820 krb5_principal init_principal,
2821 const char *init_password,
2822 krb5_principal impersonate_principal,
2823 const char *self_service,
2824 const char *target_service,
2825 krb5_get_init_creds_opt *krb_options,
2826 time_t *expire_time,
2827 time_t *kdc_time)
2828 {
2829 krb5_error_code code;
2830 krb5_principal self_princ = NULL;
2831 krb5_principal target_princ = NULL;
2832 krb5_creds *store_creds = NULL;
2833 krb5_creds *s4u2self_creds = NULL;
2834 krb5_creds *s4u2proxy_creds = NULL;
2835 krb5_creds init_creds = {0};
2836 krb5_creds mcreds = {0};
2837 krb5_flags options = KRB5_GC_NO_STORE;
2838 krb5_ccache tmp_cc;
2839 bool s4u2proxy = false;
2840 bool ok;
2841
2842 code = krb5_cc_new_unique(ctx, "MEMORY", NULL, &tmp_cc);
2843 if (code != 0) {
2844 return code;
2845 }
2846
2847 code = krb5_get_init_creds_password(ctx,
2848 &init_creds,
2849 init_principal,
2850 init_password,
2851 NULL,
2852 NULL,
2853 0,
2854 NULL,
2855 krb_options);
2856 if (code != 0) {
2857 goto done;
2858 }
2859
2860 code = krb5_cc_initialize(ctx, tmp_cc, init_creds.client);
2861 if (code != 0) {
2862 goto done;
2863 }
2864
2865 code = krb5_cc_store_cred(ctx, tmp_cc, &init_creds);
2866 if (code != 0) {
2867 goto done;
2868 }
2869
2870 /*
2871 * Check if we also need S4U2Proxy or if S4U2Self is
2872 * enough in order to get a ticket for the target.
2873 */
2874 if (target_service == NULL) {
2875 s4u2proxy = false;
2876 } else if (strcmp(target_service, self_service) == 0) {
2877 s4u2proxy = false;
2878 } else {
2879 s4u2proxy = true;
2880 }
2881
2882 code = krb5_parse_name(ctx, self_service, &self_princ);
2883 if (code != 0) {
2884 goto done;
2885 }
2886
2887 /*
2888 * MIT lacks aliases support in S4U, for S4U2Self we require the tgt
2889 * client and the request server to be the same principal name.
2890 */
2891 ok = princ_compare_no_dollar(ctx, init_creds.client, self_princ);
2892 if (!ok) {
2893 code = KRB5KDC_ERR_PADATA_TYPE_NOSUPP;
2894 goto done;
2895 }
2896
2897 mcreds.client = impersonate_principal;
2898 mcreds.server = init_creds.client;
2899
2900 code = krb5_get_credentials_for_user(ctx, options, tmp_cc, &mcreds,
2901 NULL, &s4u2self_creds);
2902 if (code != 0) {
2903 goto done;
2904 }
2905
2906 if (s4u2proxy) {
2907 code = krb5_parse_name(ctx, target_service, &target_princ);
2908 if (code != 0) {
2909 goto done;
2910 }
2911
2912 mcreds.client = init_creds.client;
2913 mcreds.server = target_princ;
2914 mcreds.second_ticket = s4u2self_creds->ticket;
2915
2916 code = krb5_get_credentials(ctx, options |
2917 KRB5_GC_CONSTRAINED_DELEGATION,
2918 tmp_cc, &mcreds, &s4u2proxy_creds);
2919 if (code != 0) {
2920 goto done;
2921 }
2922
2923 /* Check KDC support of S4U2Proxy extension */
2924 if (!krb5_principal_compare(ctx, s4u2self_creds->client,
2925 s4u2proxy_creds->client)) {
2926 code = KRB5KDC_ERR_PADATA_TYPE_NOSUPP;
2927 goto done;
2928 }
2929
2930 store_creds = s4u2proxy_creds;
2931 } else {
2932 store_creds = s4u2self_creds;;
2933
2934 /* We need to save the ticket with the requested server name
2935 * or the caller won't be able to find it in cache. */
2936 if (!krb5_principal_compare(ctx, self_princ,
2937 store_creds->server)) {
2938 krb5_free_principal(ctx, store_creds->server);
2939 store_creds->server = NULL;
2940 code = krb5_copy_principal(ctx, self_princ,
2941 &store_creds->server);
2942 if (code != 0) {
2943 goto done;
2944 }
2945 }
2946 }
2947
2948 code = krb5_cc_initialize(ctx, store_cc, store_creds->client);
2949 if (code != 0) {
2950 goto done;
2951 }
2952
2953 code = krb5_cc_store_cred(ctx, store_cc, store_creds);
2954 if (code != 0) {
2955 goto done;
2956 }
2957
2958 if (expire_time) {
2959 *expire_time = (time_t) store_creds->times.endtime;
2960 }
2961
2962 if (kdc_time) {
2963 *kdc_time = (time_t) store_creds->times.starttime;
2964 }
2965
2966 done:
2967 krb5_cc_destroy(ctx, tmp_cc);
2968 krb5_free_cred_contents(ctx, &init_creds);
2969 krb5_free_creds(ctx, s4u2self_creds);
2970 krb5_free_creds(ctx, s4u2proxy_creds);
2971 krb5_free_principal(ctx, self_princ);
2972 krb5_free_principal(ctx, target_princ);
2973
2974 return code;
2975 }
2976 #endif
2977
2978 #if !defined(HAVE_KRB5_MAKE_PRINCIPAL) && defined(HAVE_KRB5_BUILD_PRINCIPAL_ALLOC_VA)
2979 /**
2980 * @brief Create a principal name using a variable argument list.
2981 *
2982 * @param[in] context The library context.
2983 *
2984 * @param[inout] principal A pointer to the principal structure.
2985 *
2986 * @param[in] _realm The realm to use. If NULL then the function will
2987 * get the default realm name.
2988 *
2989 * @param[in] ... A list of 'char *' components, ending with NULL.
2990 *
2991 * Use krb5_free_principal() to free the principal when it is no longer needed.
2992 *
2993 * @return 0 on success, a Kerberos error code otherwise.
2994 */
2995 krb5_error_code smb_krb5_make_principal(krb5_context context,
2996 krb5_principal *principal,
2997 const char *_realm, ...)
2998 {
2999 krb5_error_code code;
3000 bool free_realm;
3001 char *realm;
3002 va_list ap;
3003
3004 if (_realm) {
3005 realm = discard_const_p(char, _realm);
3006 free_realm = false;
3007 } else {
3008 code = krb5_get_default_realm(context, &realm);
3009 if (code) {
3010 return code;
3011 }
3012 free_realm = true;
3013 }
3014
3015 va_start(ap, _realm);
3016 code = krb5_build_principal_alloc_va(context, principal,
3017 strlen(realm), realm,
3018 ap);
3019 va_end(ap);
3020
3021 if (free_realm) {
3022 krb5_free_default_realm(context, realm);
3023 }
3024
3025 return code;
3026 }
3027 #endif
3028
3029 #if !defined(HAVE_KRB5_CC_GET_LIFETIME) && defined(HAVE_KRB5_CC_RETRIEVE_CRED)
3030 /**
3031 * @brief Get the lifetime of the initial ticket in the cache.
3032 *
3033 * @param[in] context The kerberos context.
3034 *
3035 * @param[in] id The credential cache to get the ticket lifetime.
3036 *
3037 * @param[out] t A pointer to a time value to store the lifetime.
3038 *
3039 * @return 0 on success, a krb5_error_code on error.
3040 */
3041 krb5_error_code smb_krb5_cc_get_lifetime(krb5_context context,
3042 krb5_ccache id,
3043 time_t *t)
3044 {
3045 krb5_cc_cursor cursor;
3046 krb5_error_code kerr;
3047 krb5_creds cred;
3048 krb5_timestamp now;
3049
3050 *t = 0;
3051
3052 kerr = krb5_timeofday(context, &now);
3053 if (kerr) {
3054 return kerr;
3055 }
3056
3057 kerr = krb5_cc_start_seq_get(context, id, &cursor);
3058 if (kerr) {
3059 return kerr;
3060 }
3061
3062 while ((kerr = krb5_cc_next_cred(context, id, &cursor, &cred)) == 0) {
3063 #ifndef HAVE_FLAGS_IN_KRB5_CREDS
3064 if (cred.ticket_flags & TKT_FLG_INITIAL) {
3065 #else
3066 if (cred.flags.b.initial) {
3067 #endif
3068 if (now < cred.times.endtime) {
3069 *t = (time_t) (cred.times.endtime - now);
3070 }
3071 krb5_free_cred_contents(context, &cred);
3072 break;
3073 }
3074 krb5_free_cred_contents(context, &cred);
3075 }
3076
3077 krb5_cc_end_seq_get(context, id, &cursor);
3078
3079 return kerr;
3080 }
3081 #endif /* HAVE_KRB5_CC_GET_LIFETIME */
3082
3083 #if !defined(HAVE_KRB5_FREE_CHECKSUM_CONTENTS) && defined(HAVE_FREE_CHECKSUM)
3084 void smb_krb5_free_checksum_contents(krb5_context ctx, krb5_checksum *cksum)
3085 {
3086 free_Checksum(cksum);
3087 }
3088 #endif
3089
3090 /**
3091 * @brief Compute a checksum operating on a keyblock.
3092 *
3093 * This function computes a checksum over a PAC using the keyblock for a keyed
3094 * checksum.
3095 *
3096 * @param[in] mem_ctx A talloc context to allocate the signature on.
3097 *
3098 * @param[in] pac_data The PAC as input.
3099 *
3100 * @param[in] context The library context.
3101 *
3102 * @param[in] keyblock Encryption key for a keyed checksum.
3103 *
3104 * @param[out] sig_type The checksum type
3105 *
3106 * @param[out] sig_blob The talloc'ed checksum
3107 *
3108 * The caller must free the sig_blob with talloc_free() when it is not needed
3109 * anymore.
3110 *
3111 * @return 0 on success, a Kerberos error code otherwise.
3112 */
3113 krb5_error_code smb_krb5_make_pac_checksum(TALLOC_CTX *mem_ctx,
3114 DATA_BLOB *pac_data,
3115 krb5_context context,
3116 const krb5_keyblock *keyblock,
3117 uint32_t *sig_type,
3118 DATA_BLOB *sig_blob)
3119 {
3120 krb5_error_code ret;
3121 krb5_checksum cksum;
3122 #if defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CREATE_CHECKSUM)
3123 krb5_crypto crypto;
3124
3125
3126 ret = krb5_crypto_init(context,
3127 keyblock,
3128 0,
3129 &crypto);
3130 if (ret) {
3131 DEBUG(0,("krb5_crypto_init() failed: %s\n",
3132 smb_get_krb5_error_message(context, ret, mem_ctx)));
3133 return ret;
3134 }
3135 ret = krb5_create_checksum(context,
3136 crypto,
3137 KRB5_KU_OTHER_CKSUM,
3138 0,
3139 pac_data->data,
3140 pac_data->length,
3141 &cksum);
3142 if (ret) {
3143 DEBUG(2, ("PAC Verification failed: %s\n",
3144 smb_get_krb5_error_message(context, ret, mem_ctx)));
3145 }
3146
3147 krb5_crypto_destroy(context, crypto);
3148
3149 if (ret) {
3150 return ret;
3151 }
3152
3153 *sig_type = cksum.cksumtype;
3154 *sig_blob = data_blob_talloc(mem_ctx,
3155 cksum.checksum.data,
3156 cksum.checksum.length);
3157 #elif defined(HAVE_KRB5_C_MAKE_CHECKSUM)
3158 krb5_data input;
3159
3160 input.data = (char *)pac_data->data;
3161 input.length = pac_data->length;
3162
3163 ret = krb5_c_make_checksum(context,
3164 0,
3165 keyblock,
3166 KRB5_KEYUSAGE_APP_DATA_CKSUM,
3167 &input,
3168 &cksum);
3169 if (ret) {
3170 DEBUG(2, ("PAC Verification failed: %s\n",
3171 smb_get_krb5_error_message(context, ret, mem_ctx)));
3172 return ret;
3173 }
3174
3175 *sig_type = cksum.checksum_type;
3176 *sig_blob = data_blob_talloc(mem_ctx,
3177 cksum.contents,
3178 cksum.length);
3179
3180 #else
3181 #error krb5_create_checksum or krb5_c_make_checksum not available
3182 #endif /* HAVE_KRB5_C_MAKE_CHECKSUM */
3183 smb_krb5_free_checksum_contents(context, &cksum);
3184
3185 return 0;
3186 }
3187
3188
3189 /**
3190 * @brief Get realm of a principal
3191 *
3192 * @param[in] mem_ctx The talloc ctx to put the result on
3193 *
3194 * @param[in] context The library context
3195 *
3196 * @param[in] principal The principal to get the realm from.
3197 *
3198 * @return A talloced string with the realm or NULL if an error occurred.
3199 */
3200 char *smb_krb5_principal_get_realm(TALLOC_CTX *mem_ctx,
3201 krb5_context context,
3202 krb5_const_principal principal)
3203 {
3204 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
3205 const char *realm = NULL;
3206
3207 realm = krb5_principal_get_realm(context, principal);
3208 if (realm == NULL) {
3209 return NULL;
3210 }
3211
3212 return talloc_strdup(mem_ctx, realm);
3213 #elif defined(krb5_princ_realm) /* MIT */
3214 const krb5_data *realm = NULL;
3215
3216 realm = krb5_princ_realm(context, principal);
3217 if (realm == NULL) {
3218 return NULL;
3219 }
3220
3221 return talloc_strndup(mem_ctx, realm->data, realm->length);
3222 #else
3223 #error UNKNOWN_GET_PRINC_REALM_FUNCTIONS
3224 #endif
3225 }
3226
3227 /**
3228 * @brief Get realm of a principal
3229 *
3230 * @param[in] context The library context
3231 *
3232 * @param[in] principal The principal to set the realm
3233 *
3234 * @param[in] realm The realm as a string to set.
3235 *
3236 * @return 0 on success, a Kerberos error code otherwise.
3237 */
3238 krb5_error_code smb_krb5_principal_set_realm(krb5_context context,
3239 krb5_principal principal,
3240 const char *realm)
3241 {
3242 #ifdef HAVE_KRB5_PRINCIPAL_SET_REALM /* Heimdal */
3243 return krb5_principal_set_realm(context, principal, realm);
3244 #elif defined(krb5_princ_realm) && defined(krb5_princ_set_realm) /* MIT */
3245 krb5_error_code ret;
3246 krb5_data data;
3247 krb5_data *old_data;
3248
3249 old_data = krb5_princ_realm(context, principal);
3250
3251 ret = smb_krb5_copy_data_contents(&data,
3252 realm,
3253 strlen(realm));
3254 if (ret) {
3255 return ret;
3256 }
3257
3258 /* free realm before setting */
3259 free(old_data->data);
3260
3261 krb5_princ_set_realm(context, principal, &data);
3262
3263 return ret;
3264 #else
3265 #error UNKNOWN_PRINC_SET_REALM_FUNCTION
3266 #endif
3267 }
3268
3269
3270 /**
3271 * @brief Get the realm from the service hostname.
3272 *
3273 * This function will look for a domain realm mapping in the [domain_realm]
3274 * section of the krb5.conf first and fallback to extract the realm from
3275 * the provided service hostname. As a last resort it will return the
3276 * provided client_realm.
3277 *
3278 * @param[in] mem_ctx The talloc context
3279 *
3280 * @param[in] hostname The service hostname
3281 *
3282 * @param[in] client_realm If we can not find a mapping, fall back to
3283 * this realm.
3284 *
3285 * @return The realm to use for the service hostname, NULL if a fatal error
3286 * occurred.
3287 */
3288 char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
3289 const char *hostname,
3290 const char *client_realm)
3291 {
3292 #if defined(HAVE_KRB5_REALM_TYPE)
3293 /* Heimdal. */
3294 krb5_realm *realm_list = NULL;
3295 #else
3296 /* MIT */
3297 char **realm_list = NULL;
3298 #endif
3299 char *realm = NULL;
3300 krb5_error_code kerr;
3301 krb5_context ctx = NULL;
3302
3303 kerr = smb_krb5_init_context_common(&ctx);
3304 if (kerr) {
3305 DBG_ERR("kerberos init context failed (%s)\n",
3306 error_message(kerr));
3307 return NULL;
3308 }
3309
3310 kerr = krb5_get_host_realm(ctx, hostname, &realm_list);
3311 if (kerr == KRB5_ERR_HOST_REALM_UNKNOWN) {
3312 realm_list = NULL;
3313 kerr = 0;
3314 }
3315 if (kerr != 0) {
3316 DEBUG(3,("kerberos_get_realm_from_hostname %s: "
3317 "failed %s\n",
3318 hostname ? hostname : "(NULL)",
3319 error_message(kerr) ));
3320 goto out;
3321 }
3322
3323 if (realm_list != NULL &&
3324 realm_list[0] != NULL &&
3325 realm_list[0][0] != '\0') {
3326 realm = talloc_strdup(mem_ctx, realm_list[0]);
3327 if (realm == NULL) {
3328 goto out;
3329 }
3330 } else {
3331 const char *p = NULL;
3332
3333 /*
3334 * "dc6.samba2003.example.com"
3335 * returns a realm of "SAMBA2003.EXAMPLE.COM"
3336 *
3337 * "dc6." returns realm as NULL
3338 */
3339 p = strchr_m(hostname, '.');
3340 if (p != NULL && p[1] != '\0') {
3341 realm = talloc_strdup_upper(mem_ctx, p + 1);
3342 if (realm == NULL) {
3343 goto out;
3344 }
3345 }
3346 }
3347
3348 if (realm == NULL) {
3349 realm = talloc_strdup(mem_ctx, client_realm);
3350 }
3351
3352 out:
3353
3354 if (ctx) {
3355 if (realm_list) {
3356 krb5_free_host_realm(ctx, realm_list);
3357 realm_list = NULL;
3358 }
3359 krb5_free_context(ctx);
3360 ctx = NULL;
3361 }
3362 return realm;
3363 }
3364
3365 /**
3366 * @brief Get an error string from a Kerberos error code.
3367 *
3368 * @param[in] context The library context.
3369 *
3370 * @param[in] code The Kerberos error code.
3371 *
3372 * @param[in] mem_ctx The talloc context to allocate the error string on.
3373 *
3374 * @return A talloc'ed error string or NULL if an error occurred.
3375 *
3376 * The caller must free the returned error string with talloc_free() if not
3377 * needed anymore
3378 */
3379 char *smb_get_krb5_error_message(krb5_context context,
3380 krb5_error_code code,
3381 TALLOC_CTX *mem_ctx)
3382 {
3383 char *ret;
3384
3385 #if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
3386 const char *context_error = krb5_get_error_message(context, code);
3387 if (context_error) {
3388 ret = talloc_asprintf(mem_ctx, "%s: %s",
3389 error_message(code), context_error);
3390 krb5_free_error_message(context, context_error);
3391 return ret;
3392 }
3393 #endif
3394 ret = talloc_strdup(mem_ctx, error_message(code));
3395 return ret;
3396 }
3397
3398 /**
3399 * @brief Return the type of a krb5_principal
3400 *
3401 * @param[in] context The library context.
3402 *
3403 * @param[in] principal The principal to get the type from.
3404 *
3405 * @return The integer type of the principal.
3406 */
3407 int smb_krb5_principal_get_type(krb5_context context,
3408 krb5_const_principal principal)
3409 {
3410 #ifdef HAVE_KRB5_PRINCIPAL_GET_TYPE /* Heimdal */
3411 return krb5_principal_get_type(context, principal);
3412 #elif defined(krb5_princ_type) /* MIT */
3413 return krb5_princ_type(context, principal);
3414 #else
3415 #error UNKNOWN_PRINC_GET_TYPE_FUNCTION
3416 #endif
3417 }
3418
3419 /**
3420 * @brief Set the type of a principal
3421 *
3422 * @param[in] context The library context
3423 *
3424 * @param[inout] principal The principal to set the type for.
3425 *
3426 * @param[in] type The principal type to set.
3427 */
3428 void smb_krb5_principal_set_type(krb5_context context,
3429 krb5_principal principal,
3430 int type)
3431 {
3432 #ifdef HAVE_KRB5_PRINCIPAL_SET_TYPE /* Heimdal */
3433 krb5_principal_set_type(context, principal, type);
3434 #elif defined(krb5_princ_type) /* MIT */
3435 krb5_princ_type(context, principal) = type;
3436 #else
3437 #error UNKNOWN_PRINC_SET_TYPE_FUNCTION
3438 #endif
3439 }
3440
3441 /**
3442 * @brief Check if a principal is a TGS
3443 *
3444 * @param[in] context The library context
3445 *
3446 * @param[inout] principal The principal to check.
3447 *
3448 * @returns 1 if equal, 0 if not and -1 on error.
3449 */
3450 int smb_krb5_principal_is_tgs(krb5_context context,
3451 krb5_const_principal principal)
3452 {
3453 char *p = NULL;
3454 int eq = 1;
3455 krb5_error_code ret = 0;
3456
3457 if (krb5_princ_size(context, principal) > 2) {
3458 return 0;
3459 }
3460
3461 ret = smb_krb5_principal_get_comp_string(NULL, context, principal, 0, &p);
3462 if (ret == ENOENT) {
3463 return 0;
3464 } else if (ret) {
3465 return -1;
3466 }
3467
3468 eq = strcmp(p, KRB5_TGS_NAME) == 0;
3469
3470 talloc_free(p);
3471
3472 return eq;
3473 }
3474
3475 #if !defined(HAVE_KRB5_WARNX)
3476 /**
3477 * @brief Log a Kerberos message
3478 *
3479 * It sends the message to com_err.
3480 *
3481 * @param[in] context The library context
3482 *
3483 * @param[in] fmt The message format
3484 *
3485 * @param[in] ... The message arguments
3486 *
3487 * @return 0 on success.
3488 */
3489 krb5_error_code krb5_warnx(krb5_context context, const char *fmt, ...)
3490 {
3491 va_list args;
3492
3493 va_start(args, fmt);
3494 com_err_va("samba-kdc", errno, fmt, args);
3495 va_end(args);
3496
3497 return 0;
3498 }
3499 #endif
3500
3501 /**
3502 * @brief Copy a credential cache.
3503 *
3504 * @param[in] context The library context.
3505 *
3506 * @param[in] incc Credential cache to be copied.
3507 *
3508 * @param[inout] outcc Copy of credential cache to be filled in.
3509 *
3510 * @return 0 on success, a Kerberos error code otherwise.
3511 */
3512 krb5_error_code smb_krb5_cc_copy_creds(krb5_context context,
3513 krb5_ccache incc, krb5_ccache outcc)
3514 {
3515 #ifdef HAVE_KRB5_CC_COPY_CACHE /* Heimdal */
3516 return krb5_cc_copy_cache(context, incc, outcc);
3517 #elif defined(HAVE_KRB5_CC_COPY_CREDS)
3518 krb5_error_code ret;
3519 krb5_principal princ = NULL;
3520
3521 ret = krb5_cc_get_principal(context, incc, &princ);
3522 if (ret != 0) {
3523 return ret;
3524 }
3525 ret = krb5_cc_initialize(context, outcc, princ);
3526 krb5_free_principal(context, princ);
3527 if (ret != 0) {
3528 return ret;
3529 }
3530 return krb5_cc_copy_creds(context, incc, outcc);
3531 #else
3532 #error UNKNOWN_KRB5_CC_COPY_CACHE_OR_CREDS_FUNCTION
3533 #endif
3534 }
3535
3536 /**********************************************************
3537 * ADS KRB5 CALLS
3538 **********************************************************/
3539
3540 static bool ads_cleanup_expired_creds(krb5_context context,
3541 krb5_ccache ccache,
3542 krb5_creds *credsp)
3543 {
3544 krb5_error_code retval;
3545 const char *cc_type = krb5_cc_get_type(context, ccache);
3546
3547 DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
3548 cc_type, krb5_cc_get_name(context, ccache),
3549 http_timestring(talloc_tos(), credsp->times.endtime)));
3550
3551 /* we will probably need new tickets if the current ones
3552 will expire within 10 seconds.
3553 */
3554 if (credsp->times.endtime >= (time(NULL) + 10))
3555 return false;
3556
3557 /* heimdal won't remove creds from a file ccache, and
3558 perhaps we shouldn't anyway, since internally we
3559 use memory ccaches, and a FILE one probably means that
3560 we're using creds obtained outside of our executable
3561 */
3562 if (strequal(cc_type, "FILE")) {
3563 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
3564 return false;
3565 }
3566
3567 retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
3568 if (retval) {
3569 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
3570 error_message(retval)));
3571 /* If we have an error in this, we want to display it,
3572 but continue as though we deleted it */
3573 }
3574 return true;
3575 }
3576
3577 /* Allocate and setup the auth context into the state we need. */
3578
3579 static krb5_error_code ads_setup_auth_context(krb5_context context,
3580 krb5_auth_context *auth_context)
3581 {
3582 krb5_error_code retval;
3583
3584 retval = krb5_auth_con_init(context, auth_context );
3585 if (retval) {
3586 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
3587 error_message(retval)));
3588 return retval;
3589 }
3590
3591 /* Ensure this is an addressless ticket. */
3592 retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
3593 if (retval) {
3594 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
3595 error_message(retval)));
3596 }
3597
3598 return retval;
3599 }
3600
3601 #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)
3602 static krb5_error_code ads_create_gss_checksum(krb5_data *in_data, /* [inout] */
3603 uint32_t gss_flags)
3604 {
3605 unsigned int orig_length = in_data->length;
3606 unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
3607 char *gss_cksum = NULL;
3608
3609 if (orig_length) {
3610 /* Extra length field for delegated ticket. */
3611 base_cksum_size += 4;
3612 }
3613
3614 if ((unsigned int)base_cksum_size + orig_length <
3615 (unsigned int)base_cksum_size) {
3616 return EINVAL;
3617 }
3618
3619 gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
3620 if (gss_cksum == NULL) {
3621 return ENOMEM;
3622 }
3623
3624 memset(gss_cksum, '\0', base_cksum_size + orig_length);
3625 SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
3626
3627 /*
3628 * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
3629 * This matches the behavior of heimdal and mit.
3630 *
3631 * And it is needed to work against some closed source
3632 * SMB servers.
3633 *
3634 * See bug #7883
3635 */
3636 memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
3637
3638 SIVAL(gss_cksum, 20, gss_flags);
3639
3640 if (orig_length && in_data->data != NULL) {
3641 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
3642 SSVAL(gss_cksum, 26, orig_length);
3643 /* Copy the kerberos KRB_CRED data */
3644 memcpy(gss_cksum + 28, in_data->data, orig_length);
3645 free(in_data->data);
3646 in_data->data = NULL;
3647 in_data->length = 0;
3648 }
3649 in_data->data = gss_cksum;
3650 in_data->length = base_cksum_size + orig_length;
3651 return 0;
3652 }
3653 #endif
3654
3655 /*
3656 * We can't use krb5_mk_req because w2k wants the service to be in a particular
3657 * format.
3658 */
3659 static krb5_error_code ads_krb5_mk_req(krb5_context context,
3660 krb5_auth_context *auth_context,
3661 const krb5_flags ap_req_options,
3662 const char *principal,
3663 krb5_ccache ccache,
3664 krb5_data *outbuf,
3665 time_t *expire_time,
3666 const char *impersonate_princ_s)
3667 {
3668 krb5_error_code retval;
3669 krb5_principal server;
3670 krb5_principal impersonate_princ = NULL;
3671 krb5_creds *credsp;
3672 krb5_creds creds;
3673 krb5_data in_data;
3674 bool creds_ready = false;
3675 int i = 0, maxtries = 3;
3676 bool ok;
3677
3678 ZERO_STRUCT(in_data);
3679
3680 retval = smb_krb5_parse_name(context, principal, &server);
3681 if (retval != 0) {
3682 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
3683 return retval;
3684 }
3685
3686 if (impersonate_princ_s) {
3687 retval = smb_krb5_parse_name(context, impersonate_princ_s,
3688 &impersonate_princ);
3689 if (retval) {
3690 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
3691 goto cleanup_princ;
3692 }
3693 }
3694
3695 /* obtain ticket & session key */
3696 ZERO_STRUCT(creds);
3697 if ((retval = krb5_copy_principal(context, server, &creds.server))) {
3698 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
3699 error_message(retval)));
3700 goto cleanup_princ;
3701 }
3702
3703 retval = krb5_cc_get_principal(context, ccache, &creds.client);
3704 if (retval != 0) {
3705 /* This can commonly fail on smbd startup with no ticket in the cache.
3706 * Report at higher level than 1. */
3707 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
3708 error_message(retval)));
3709 goto cleanup_creds;
3710 }
3711
3712 while (!creds_ready && (i < maxtries)) {
3713
3714 retval = smb_krb5_get_credentials(context,
3715 ccache,
3716 creds.client,
3717 creds.server,
3718 impersonate_princ,
3719 &credsp);
3720 if (retval != 0) {
3721 DBG_WARNING("smb_krb5_get_credentials failed for %s "
3722 "(%s)\n",
3723 principal,
3724 error_message(retval));
3725 goto cleanup_creds;
3726 }
3727
3728 /* cope with ticket being in the future due to clock skew */
3729 if ((unsigned)credsp->times.starttime > time(NULL)) {
3730 time_t t = time(NULL);
3731 int time_offset =(int)((unsigned)credsp->times.starttime-t);
3732 DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
3733 krb5_set_real_time(context, t + time_offset + 1, 0);
3734 }
3735
3736 ok = ads_cleanup_expired_creds(context, ccache, credsp);
3737 if (!ok) {
3738 creds_ready = true;
3739 }
3740
3741 i++;
3742 }
3743
3744 DBG_DEBUG("Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
3745 principal,
3746 krb5_cc_get_type(context, ccache),
3747 krb5_cc_get_name(context, ccache),
3748 http_timestring(talloc_tos(),
3749 (unsigned)credsp->times.endtime),
3750 (unsigned)credsp->times.endtime);
3751
3752 if (expire_time) {
3753 *expire_time = (time_t)credsp->times.endtime;
3754 }
3755
3756 /* Allocate the auth_context. */
3757 retval = ads_setup_auth_context(context, auth_context);
3758 if (retval != 0) {
3759 DBG_WARNING("ads_setup_auth_context failed (%s)\n",
3760 error_message(retval));
3761 goto cleanup_creds;
3762 }
3763
3764 #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)
3765 {
3766 uint32_t gss_flags = 0;
3767
3768 if (credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE) {
3769 /*
3770 * Fetch a forwarded TGT from the KDC so that we can
3771 * hand off a 2nd ticket as part of the kerberos
3772 * exchange.
3773 */
3774
3775 DBG_INFO("Server marked as OK to delegate to, building "
3776 "forwardable TGT\n");
3777
3778 retval = krb5_auth_con_setuseruserkey(context,
3779 *auth_context,
3780 &credsp->keyblock );
3781 if (retval != 0) {
3782 DBG_WARNING("krb5_auth_con_setuseruserkey "
3783 "failed (%s)\n",
3784 error_message(retval));
3785 goto cleanup_creds;
3786 }
3787
3788 /* Must use a subkey for forwarded tickets. */
3789 retval = krb5_auth_con_setflags(context,
3790 *auth_context,
3791 KRB5_AUTH_CONTEXT_USE_SUBKEY);
3792 if (retval != 0) {
3793 DBG_WARNING("krb5_auth_con_setflags failed (%s)\n",
3794 error_message(retval));
3795 goto cleanup_creds;
3796 }
3797
3798 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
3799 *auth_context, /* Authentication context [in] */
3800 discard_const_p(char, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
3801 credsp->client, /* Client principal for the tgt [in] */
3802 credsp->server, /* Server principal for the tgt [in] */
3803 ccache, /* Credential cache to use for storage [in] */
3804 1, /* Turn on for "Forwardable ticket" [in] */
3805 &in_data ); /* Resulting response [out] */
3806
3807 if (retval) {
3808 DBG_INFO("krb5_fwd_tgt_creds failed (%s)\n",
3809 error_message(retval));
3810
3811 /*
3812 * This is not fatal. Delete the *auth_context and continue
3813 * with krb5_mk_req_extended to get a non-forwardable ticket.
3814 */
3815
3816 if (in_data.data) {
3817 free( in_data.data );
3818 in_data.data = NULL;
3819 in_data.length = 0;
3820 }
3821 krb5_auth_con_free(context, *auth_context);
3822 *auth_context = NULL;
3823 retval = ads_setup_auth_context(context, auth_context);
3824 if (retval != 0) {
3825 DBG_WARNING("ads_setup_auth_context failed (%s)\n",
3826 error_message(retval));
3827 goto cleanup_creds;
3828 }
3829 } else {
3830 /* We got a delegated ticket. */
3831 gss_flags |= GSS_C_DELEG_FLAG;
3832 }
3833 }
3834
3835 /* Frees and reallocates in_data into a GSS checksum blob. */
3836 retval = ads_create_gss_checksum(&in_data, gss_flags);
3837 if (retval != 0) {
3838 goto cleanup_data;
3839 }
3840
3841 /* We always want GSS-checksum types. */
3842 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
3843 if (retval != 0) {
3844 DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
3845 error_message(retval)));
3846 goto cleanup_data;
3847 }
3848 }
3849 #endif
3850
3851 retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
3852 &in_data, credsp, outbuf);
3853 if (retval != 0) {
3854 DBG_WARNING("krb5_mk_req_extended failed (%s)\n",
3855 error_message(retval));
3856 }
3857
3858 #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)
3859 cleanup_data:
3860 #endif
3861
3862 if (in_data.data) {
3863 free( in_data.data );
3864 in_data.length = 0;
3865 }
3866
3867 krb5_free_creds(context, credsp);
3868
3869 cleanup_creds:
3870 krb5_free_cred_contents(context, &creds);
3871
3872 cleanup_princ:
3873 krb5_free_principal(context, server);
3874 if (impersonate_princ) {
3875 krb5_free_principal(context, impersonate_princ);
3876 }
3877
3878 return retval;
3879 }
3880
3881 /*
3882 get a kerberos5 ticket for the given service
3883 */
3884 int ads_krb5_cli_get_ticket(TALLOC_CTX *mem_ctx,
3885 const char *principal,
3886 time_t time_offset,
3887 DATA_BLOB *ticket,
3888 DATA_BLOB *session_key_krb5,
3889 uint32_t extra_ap_opts, const char *ccname,
3890 time_t *tgs_expire,
3891 const char *impersonate_princ_s)
3892 {
3893 krb5_error_code retval;
3894 krb5_data packet;
3895 krb5_context context = NULL;
3896 krb5_ccache ccdef = NULL;
3897 krb5_auth_context auth_context = NULL;
3898 krb5_enctype enc_types[] = {
3899 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
3900 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
3901 ENCTYPE_ARCFOUR_HMAC,
3902 ENCTYPE_NULL};
3903 bool ok;
3904
3905 DBG_DEBUG("Getting ticket for service [%s] using creds from [%s] "
3906 "and impersonating [%s]\n",
3907 principal, ccname, impersonate_princ_s);
3908
3909 retval = smb_krb5_init_context_common(&context);
3910 if (retval != 0) {
3911 DBG_ERR("kerberos init context failed (%s)\n",
3912 error_message(retval));
3913 goto failed;
3914 }
3915
3916 if (time_offset != 0) {
3917 krb5_set_real_time(context, time(NULL) + time_offset, 0);
3918 }
3919
3920 retval = krb5_cc_resolve(context,
3921 ccname ? ccname : krb5_cc_default_name(context),
3922 &ccdef);
3923 if (retval != 0) {
3924 DBG_WARNING("krb5_cc_default failed (%s)\n",
3925 error_message(retval));
3926 goto failed;
3927 }
3928
3929 retval = krb5_set_default_tgs_ktypes(context, enc_types);
3930 if (retval != 0) {
3931 DBG_WARNING("krb5_set_default_tgs_ktypes failed (%s)\n",
3932 error_message(retval));
3933 goto failed;
3934 }
3935
3936 retval = ads_krb5_mk_req(context,
3937 &auth_context,
3938 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
3939 principal,
3940 ccdef,
3941 &packet,
3942 tgs_expire,
3943 impersonate_princ_s);
3944 if (retval != 0) {
3945 goto failed;
3946 }
3947
3948 ok = smb_krb5_get_smb_session_key(mem_ctx,
3949 context,
3950 auth_context,
3951 session_key_krb5,
3952 false);
3953 if (!ok) {
3954 retval = ENOMEM;
3955 goto failed;
3956 }
3957
3958 *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
3959
3960 smb_krb5_free_data_contents(context, &packet);
3961
3962 failed:
3963
3964 if (context) {
3965 if (ccdef) {
3966 krb5_cc_close(context, ccdef);
3967 }
3968 if (auth_context) {
3969 krb5_auth_con_free(context, auth_context);
3970 }
3971 krb5_free_context(context);
3972 }
3973
3974 return retval;
3975 }
3976
3977 #ifndef SAMBA4_USES_HEIMDAL /* MITKRB5 tracing callback */
3978 static void smb_krb5_trace_cb(krb5_context ctx,
3979 #ifdef HAVE_KRB5_TRACE_INFO
3980 const krb5_trace_info *info,
3981 #elif defined(HAVE_KRB5_TRACE_INFO_STRUCT)
3982 const struct krb5_trace_info *info,
3983 #else
3984 #error unknown krb5_trace_info
3985 #endif
3986 void *data)
3987 {
3988 if (info != NULL) {
3989 DBGC_DEBUG(DBGC_KERBEROS, "%s", info->message);
3990 }
3991 }
3992 #endif
3993
3994 krb5_error_code smb_krb5_init_context_common(krb5_context *_krb5_context)
3995 {
3996 krb5_error_code ret;
3997 krb5_context krb5_ctx;
3998
3999 initialize_krb5_error_table();
4000
4001 ret = krb5_init_context(&krb5_ctx);
4002 if (ret) {
4003 DBG_ERR("Krb5 context initialization failed (%s)\n",
4004 error_message(ret));
4005 return ret;
4006 }
4007
4008 /* The MIT Kerberos build relies on using the system krb5.conf file.
4009 * If you really want to use another file please set KRB5_CONFIG
4010 * accordingly. */
4011 #ifndef SAMBA4_USES_HEIMDAL
4012 ret = krb5_set_trace_callback(krb5_ctx, smb_krb5_trace_cb, NULL);
4013 if (ret) {
4014 DBG_ERR("Failed to set MIT kerberos trace callback! (%s)\n",
4015 error_message(ret));
4016 }
4017 #endif
4018
4019 #ifdef SAMBA4_USES_HEIMDAL
4020 /* Set options in kerberos */
4021 krb5_set_dns_canonicalize_hostname(krb5_ctx, false);
4022 #endif
4023
4024 *_krb5_context = krb5_ctx;
4025 return 0;
4026 }
4027
4028 #else /* HAVE_KRB5 */
4029 /* This saves a few linking headaches */
4030 int ads_krb5_cli_get_ticket(TALLOC_CTX *mem_ctx,
4031 const char *principal,
4032 time_t time_offset,
4033 DATA_BLOB *ticket,
4034 DATA_BLOB *session_key_krb5,
4035 uint32_t extra_ap_opts, const char *ccname,
4036 time_t *tgs_expire,
4037 const char *impersonate_princ_s)
4038 {
4039 DEBUG(0,("NO KERBEROS SUPPORT\n"));
4040 return 1;
4041 }
4042
4043 #endif /* HAVE_KRB5 */
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