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 */
krb5_set_default_tgs_ktypes(krb5_context ctx,const krb5_enctype * enc)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 */
krb5_set_default_tgs_ktypes(krb5_context ctx,const krb5_enctype * enc)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)
krb5_auth_con_setuseruserkey(krb5_context context,krb5_auth_context auth_context,krb5_keyblock * keyblock)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)
krb5_free_unparsed_name(krb5_context context,char * val)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_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
118 const krb5_data *krb5_princ_component(krb5_context context,
119 krb5_principal principal, int i);
120
krb5_princ_component(krb5_context context,krb5_principal principal,int i)121 const krb5_data *krb5_princ_component(krb5_context context,
122 krb5_principal principal, int i)
123 {
124 static krb5_data kdata;
125
126 kdata.data = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i));
127 kdata.length = strlen((const char *)kdata.data);
128 return &kdata;
129 }
130 #endif
131
132
133 /**********************************************************
134 * WRAPPING FUNCTIONS
135 **********************************************************/
136
137 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
138 /* HEIMDAL */
139
140 /**
141 * @brief Stores the address of a 'struct sockaddr_storage' a krb5_address
142 *
143 * @param[in] paddr A pointer to a 'struct sockaddr_storage to extract the
144 * address from.
145 *
146 * @param[out] pkaddr A Kerberos address to store tha address in.
147 *
148 * @return True on success, false if an error occurred.
149 */
smb_krb5_sockaddr_to_kaddr(struct sockaddr_storage * paddr,krb5_address * pkaddr)150 bool smb_krb5_sockaddr_to_kaddr(struct sockaddr_storage *paddr,
151 krb5_address *pkaddr)
152 {
153 memset(pkaddr, '\0', sizeof(krb5_address));
154 #ifdef HAVE_IPV6
155 if (paddr->ss_family == AF_INET6) {
156 pkaddr->addr_type = KRB5_ADDRESS_INET6;
157 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
158 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
159 return true;
160 }
161 #endif
162 if (paddr->ss_family == AF_INET) {
163 pkaddr->addr_type = KRB5_ADDRESS_INET;
164 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
165 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
166 return true;
167 }
168 return false;
169 }
170 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
171 /* MIT */
172
173 /**
174 * @brief Stores the address of a 'struct sockaddr_storage' a krb5_address
175 *
176 * @param[in] paddr A pointer to a 'struct sockaddr_storage to extract the
177 * address from.
178 *
179 * @param[in] pkaddr A Kerberos address to store tha address in.
180 *
181 * @return True on success, false if an error occurred.
182 */
smb_krb5_sockaddr_to_kaddr(struct sockaddr_storage * paddr,krb5_address * pkaddr)183 bool smb_krb5_sockaddr_to_kaddr(struct sockaddr_storage *paddr,
184 krb5_address *pkaddr)
185 {
186 memset(pkaddr, '\0', sizeof(krb5_address));
187 #ifdef HAVE_IPV6
188 if (paddr->ss_family == AF_INET6) {
189 pkaddr->addrtype = ADDRTYPE_INET6;
190 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
191 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
192 return true;
193 }
194 #endif
195 if (paddr->ss_family == AF_INET) {
196 pkaddr->addrtype = ADDRTYPE_INET;
197 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
198 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
199 return true;
200 }
201 return false;
202 }
203 #else
204 #error UNKNOWN_ADDRTYPE
205 #endif
206
smb_krb5_mk_error(krb5_context context,krb5_error_code error_code,const char * e_text,krb5_data * e_data,const krb5_principal client,const krb5_principal server,krb5_data * enc_err)207 krb5_error_code smb_krb5_mk_error(krb5_context context,
208 krb5_error_code error_code,
209 const char *e_text,
210 krb5_data *e_data,
211 const krb5_principal client,
212 const krb5_principal server,
213 krb5_data *enc_err)
214 {
215 krb5_error_code code = EINVAL;
216 #ifdef SAMBA4_USES_HEIMDAL
217 code = krb5_mk_error(context,
218 error_code,
219 e_text,
220 e_data,
221 client,
222 server,
223 NULL, /* client_time */
224 NULL, /* client_usec */
225 enc_err);
226 #else
227 krb5_principal unspec_server = NULL;
228 krb5_error errpkt;
229
230 errpkt.ctime = 0;
231 errpkt.cusec = 0;
232
233 code = krb5_us_timeofday(context,
234 &errpkt.stime,
235 &errpkt.susec);
236 if (code != 0) {
237 return code;
238 }
239
240 errpkt.error = error_code;
241
242 errpkt.text.length = 0;
243 if (e_text != NULL) {
244 errpkt.text.length = strlen(e_text);
245 errpkt.text.data = discard_const_p(char, e_text);
246 }
247
248 errpkt.e_data.magic = KV5M_DATA;
249 errpkt.e_data.length = 0;
250 errpkt.e_data.data = NULL;
251 if (e_data != NULL) {
252 errpkt.e_data = *e_data;
253 }
254
255 errpkt.client = client;
256
257 if (server != NULL) {
258 errpkt.server = server;
259 } else {
260 code = smb_krb5_make_principal(context,
261 &unspec_server,
262 "<unspecified realm>",
263 NULL);
264 if (code != 0) {
265 return code;
266 }
267 errpkt.server = unspec_server;
268 }
269
270 code = krb5_mk_error(context,
271 &errpkt,
272 enc_err);
273 krb5_free_principal(context, unspec_server);
274 #endif
275 return code;
276 }
277
278 /**
279 * @brief Create a keyblock based on input parameters
280 *
281 * @param context The krb5_context
282 * @param host_princ The krb5_principal to use
283 * @param salt The optional salt, if omitted, salt is calculated with
284 * the provided principal.
285 * @param password The krb5_data containing the password
286 * @param enctype The krb5_enctype to use for the keyblock generation
287 * @param key The returned krb5_keyblock, caller needs to free with
288 * krb5_free_keyblock().
289 *
290 * @return krb5_error_code
291 */
smb_krb5_create_key_from_string(krb5_context context,krb5_const_principal host_princ,krb5_data * salt,krb5_data * password,krb5_enctype enctype,krb5_keyblock * key)292 int smb_krb5_create_key_from_string(krb5_context context,
293 krb5_const_principal host_princ,
294 krb5_data *salt,
295 krb5_data *password,
296 krb5_enctype enctype,
297 krb5_keyblock *key)
298 {
299 int ret = 0;
300
301 if (host_princ == NULL && salt == NULL) {
302 return -1;
303 }
304
305 if ((int)enctype == (int)ENCTYPE_ARCFOUR_HMAC) {
306 TALLOC_CTX *frame = talloc_stackframe();
307 uint8_t *utf16 = NULL;
308 size_t utf16_size = 0;
309 uint8_t nt_hash[16];
310 bool ok;
311
312 ok = convert_string_talloc(frame, CH_UNIX, CH_UTF16LE,
313 password->data, password->length,
314 (void **)&utf16, &utf16_size);
315 if (!ok) {
316 if (errno == 0) {
317 errno = EINVAL;
318 }
319 ret = errno;
320 TALLOC_FREE(frame);
321 return ret;
322 }
323
324 mdfour(nt_hash, utf16, utf16_size);
325 memset(utf16, 0, utf16_size);
326 ret = smb_krb5_keyblock_init_contents(context,
327 ENCTYPE_ARCFOUR_HMAC,
328 nt_hash,
329 sizeof(nt_hash),
330 key);
331 ZERO_STRUCT(nt_hash);
332 if (ret != 0) {
333 TALLOC_FREE(frame);
334 return ret;
335 }
336
337 TALLOC_FREE(frame);
338 return 0;
339 }
340
341 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_C_STRING_TO_KEY)
342 {/* MIT */
343 krb5_data _salt;
344
345 if (salt == NULL) {
346 ret = krb5_principal2salt(context, host_princ, &_salt);
347 if (ret) {
348 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
349 return ret;
350 }
351 } else {
352 _salt = *salt;
353 }
354 ret = krb5_c_string_to_key(context, enctype, password, &_salt, key);
355 if (salt == NULL) {
356 SAFE_FREE(_salt.data);
357 }
358 }
359 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
360 {/* Heimdal */
361 krb5_salt _salt;
362
363 if (salt == NULL) {
364 ret = krb5_get_pw_salt(context, host_princ, &_salt);
365 if (ret) {
366 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
367 return ret;
368 }
369 } else {
370 _salt.saltvalue = *salt;
371 _salt.salttype = KRB5_PW_SALT;
372 }
373
374 ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, _salt, key);
375 if (salt == NULL) {
376 krb5_free_salt(context, _salt);
377 }
378 }
379 #else
380 #error UNKNOWN_CREATE_KEY_FUNCTIONS
381 #endif
382 return ret;
383 }
384
385 /**
386 * @brief Create a salt for a given principal
387 *
388 * @param context The initialized krb5_context
389 * @param host_princ The krb5_principal to create the salt for
390 * @param psalt A pointer to a krb5_data struct
391 *
392 * caller has to free the contents of psalt with smb_krb5_free_data_contents
393 * when function has succeeded
394 *
395 * @return krb5_error_code, returns 0 on success, error code otherwise
396 */
397
smb_krb5_get_pw_salt(krb5_context context,krb5_const_principal host_princ,krb5_data * psalt)398 int smb_krb5_get_pw_salt(krb5_context context,
399 krb5_const_principal host_princ,
400 krb5_data *psalt)
401 #if defined(HAVE_KRB5_GET_PW_SALT)
402 /* Heimdal */
403 {
404 int ret;
405 krb5_salt salt;
406
407 ret = krb5_get_pw_salt(context, host_princ, &salt);
408 if (ret) {
409 return ret;
410 }
411
412 psalt->data = salt.saltvalue.data;
413 psalt->length = salt.saltvalue.length;
414
415 return ret;
416 }
417 #elif defined(HAVE_KRB5_PRINCIPAL2SALT)
418 /* MIT */
419 {
420 return krb5_principal2salt(context, host_princ, psalt);
421 }
422 #else
423 #error UNKNOWN_SALT_FUNCTIONS
424 #endif
425
426 /**
427 * @brief This constructs the salt principal used by active directory
428 *
429 * Most Kerberos encryption types require a salt in order to
430 * calculate the long term private key for user/computer object
431 * based on a password.
432 *
433 * The returned _salt_principal is a string in forms like this:
434 * - host/somehost.example.com@EXAMPLE.COM
435 * - SomeAccount@EXAMPLE.COM
436 * - SomePrincipal@EXAMPLE.COM
437 *
438 * This is not the form that's used as salt, it's just
439 * the human readable form. It needs to be converted by
440 * smb_krb5_salt_principal2data().
441 *
442 * @param[in] realm The realm the user/computer is added too.
443 *
444 * @param[in] sAMAccountName The sAMAccountName attribute of the object.
445 *
446 * @param[in] userPrincipalName The userPrincipalName attribute of the object
447 * or NULL is not available.
448 *
449 * @param[in] uac_flags UF_ACCOUNT_TYPE_MASKed userAccountControl field
450 *
451 * @param[in] mem_ctx The TALLOC_CTX to allocate _salt_principal.
452 *
453 * @param[out] _salt_principal The resulting principal as string.
454 *
455 * @retval 0 Success; otherwise - Kerberos error codes
456 *
457 * @see smb_krb5_salt_principal2data
458 */
smb_krb5_salt_principal(const char * realm,const char * sAMAccountName,const char * userPrincipalName,uint32_t uac_flags,TALLOC_CTX * mem_ctx,char ** _salt_principal)459 int smb_krb5_salt_principal(const char *realm,
460 const char *sAMAccountName,
461 const char *userPrincipalName,
462 uint32_t uac_flags,
463 TALLOC_CTX *mem_ctx,
464 char **_salt_principal)
465 {
466 TALLOC_CTX *frame = talloc_stackframe();
467 char *upper_realm = NULL;
468 const char *principal = NULL;
469 int principal_len = 0;
470
471 *_salt_principal = NULL;
472
473 if (sAMAccountName == NULL) {
474 TALLOC_FREE(frame);
475 return EINVAL;
476 }
477
478 if (realm == NULL) {
479 TALLOC_FREE(frame);
480 return EINVAL;
481 }
482
483 if (uac_flags & ~UF_ACCOUNT_TYPE_MASK) {
484 /*
485 * catch callers which still
486 * pass 'true'.
487 */
488 TALLOC_FREE(frame);
489 return EINVAL;
490 }
491 if (uac_flags == 0) {
492 /*
493 * catch callers which still
494 * pass 'false'.
495 */
496 TALLOC_FREE(frame);
497 return EINVAL;
498 }
499
500 upper_realm = strupper_talloc(frame, realm);
501 if (upper_realm == NULL) {
502 TALLOC_FREE(frame);
503 return ENOMEM;
504 }
505
506 /* Many, many thanks to lukeh@padl.com for this
507 * algorithm, described in his Nov 10 2004 mail to
508 * samba-technical@lists.samba.org */
509
510 /*
511 * Determine a salting principal
512 */
513 if (uac_flags & UF_TRUST_ACCOUNT_MASK) {
514 int computer_len = 0;
515 char *tmp = NULL;
516
517 computer_len = strlen(sAMAccountName);
518 if (sAMAccountName[computer_len-1] == '$') {
519 computer_len -= 1;
520 }
521
522 if (uac_flags & UF_INTERDOMAIN_TRUST_ACCOUNT) {
523 principal = talloc_asprintf(frame, "krbtgt/%*.*s",
524 computer_len, computer_len,
525 sAMAccountName);
526 if (principal == NULL) {
527 TALLOC_FREE(frame);
528 return ENOMEM;
529 }
530 } else {
531
532 tmp = talloc_asprintf(frame, "host/%*.*s.%s",
533 computer_len, computer_len,
534 sAMAccountName, realm);
535 if (tmp == NULL) {
536 TALLOC_FREE(frame);
537 return ENOMEM;
538 }
539
540 principal = strlower_talloc(frame, tmp);
541 TALLOC_FREE(tmp);
542 if (principal == NULL) {
543 TALLOC_FREE(frame);
544 return ENOMEM;
545 }
546 }
547
548 principal_len = strlen(principal);
549
550 } else if (userPrincipalName != NULL) {
551 char *p;
552
553 principal = userPrincipalName;
554 p = strchr(principal, '@');
555 if (p != NULL) {
556 principal_len = PTR_DIFF(p, principal);
557 } else {
558 principal_len = strlen(principal);
559 }
560 } else {
561 principal = sAMAccountName;
562 principal_len = strlen(principal);
563 }
564
565 *_salt_principal = talloc_asprintf(mem_ctx, "%*.*s@%s",
566 principal_len, principal_len,
567 principal, upper_realm);
568 if (*_salt_principal == NULL) {
569 TALLOC_FREE(frame);
570 return ENOMEM;
571 }
572
573 TALLOC_FREE(frame);
574 return 0;
575 }
576
577 /**
578 * @brief Converts the salt principal string into the salt data blob
579 *
580 * This function takes a salt_principal as string in forms like this:
581 * - host/somehost.example.com@EXAMPLE.COM
582 * - SomeAccount@EXAMPLE.COM
583 * - SomePrincipal@EXAMPLE.COM
584 *
585 * It generates values like:
586 * - EXAMPLE.COMhost/somehost.example.com
587 * - EXAMPLE.COMSomeAccount
588 * - EXAMPLE.COMSomePrincipal
589 *
590 * @param[in] realm The realm the user/computer is added too.
591 *
592 * @param[in] sAMAccountName The sAMAccountName attribute of the object.
593 *
594 * @param[in] userPrincipalName The userPrincipalName attribute of the object
595 * or NULL is not available.
596 *
597 * @param[in] is_computer The indication of the object includes
598 * objectClass=computer.
599 *
600 * @param[in] mem_ctx The TALLOC_CTX to allocate _salt_principal.
601 *
602 * @param[out] _salt_principal The resulting principal as string.
603 *
604 * @retval 0 Success; otherwise - Kerberos error codes
605 *
606 * @see smb_krb5_salt_principal
607 */
smb_krb5_salt_principal2data(krb5_context context,const char * salt_principal,TALLOC_CTX * mem_ctx,char ** _salt_data)608 int smb_krb5_salt_principal2data(krb5_context context,
609 const char *salt_principal,
610 TALLOC_CTX *mem_ctx,
611 char **_salt_data)
612 {
613 krb5_error_code ret;
614 krb5_principal salt_princ = NULL;
615 krb5_data salt;
616
617 *_salt_data = NULL;
618
619 ret = krb5_parse_name(context, salt_principal, &salt_princ);
620 if (ret != 0) {
621 return ret;
622 }
623
624 ret = smb_krb5_get_pw_salt(context, salt_princ, &salt);
625 krb5_free_principal(context, salt_princ);
626 if (ret != 0) {
627 return ret;
628 }
629
630 *_salt_data = talloc_strndup(mem_ctx,
631 (char *)salt.data,
632 salt.length);
633 smb_krb5_free_data_contents(context, &salt);
634 if (*_salt_data == NULL) {
635 return ENOMEM;
636 }
637
638 return 0;
639 }
640
641 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
642 /**
643 * @brief Get a list of encryption types allowed for session keys
644 *
645 * @param[in] context The library context
646 *
647 * @param[in] enctypes An allocated, zero-terminated list of encryption types
648 *
649 * This function returns an allocated list of encryption types allowed for
650 * session keys.
651 *
652 * Use free() to free the enctypes when it is no longer needed.
653 *
654 * @retval 0 Success; otherwise - Kerberos error codes
655 */
smb_krb5_get_allowed_etypes(krb5_context context,krb5_enctype ** enctypes)656 krb5_error_code smb_krb5_get_allowed_etypes(krb5_context context,
657 krb5_enctype **enctypes)
658 {
659 return krb5_get_permitted_enctypes(context, enctypes);
660 }
661 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
smb_krb5_get_allowed_etypes(krb5_context context,krb5_enctype ** enctypes)662 krb5_error_code smb_krb5_get_allowed_etypes(krb5_context context,
663 krb5_enctype **enctypes)
664 {
665 #ifdef HAVE_KRB5_PDU_NONE_DECL
666 return krb5_get_default_in_tkt_etypes(context, KRB5_PDU_NONE, enctypes);
667 #else
668 return krb5_get_default_in_tkt_etypes(context, enctypes);
669 #endif
670 }
671 #else
672 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
673 #endif
674
675
676 /**
677 * @brief Convert a string principal name to a Kerberos principal.
678 *
679 * @param[in] context The library context
680 *
681 * @param[in] name The principal as a unix charset string.
682 *
683 * @param[out] principal The newly allocated principal.
684 *
685 * Use krb5_free_principal() to free a principal when it is no longer needed.
686 *
687 * @return 0 on success, a Kerberos error code otherwise.
688 */
smb_krb5_parse_name(krb5_context context,const char * name,krb5_principal * principal)689 krb5_error_code smb_krb5_parse_name(krb5_context context,
690 const char *name,
691 krb5_principal *principal)
692 {
693 krb5_error_code ret;
694 char *utf8_name;
695 size_t converted_size;
696 TALLOC_CTX *frame = talloc_stackframe();
697
698 if (!push_utf8_talloc(frame, &utf8_name, name, &converted_size)) {
699 talloc_free(frame);
700 return ENOMEM;
701 }
702
703 ret = krb5_parse_name(context, utf8_name, principal);
704 if (ret == KRB5_PARSE_MALFORMED) {
705 ret = krb5_parse_name_flags(context, utf8_name,
706 KRB5_PRINCIPAL_PARSE_ENTERPRISE,
707 principal);
708 }
709 TALLOC_FREE(frame);
710 return ret;
711 }
712
713 /**
714 * @brief Convert a Kerberos principal structure to a string representation.
715 *
716 * The resulting string representation will be a unix charset name and is
717 * talloc'ed.
718 *
719 * @param[in] mem_ctx The talloc context to allocate memory on.
720 *
721 * @param[in] context The library context.
722 *
723 * @param[in] principal The principal.
724 *
725 * @param[out] unix_name A string representation of the princpial name as with
726 * unix charset.
727 *
728 * Use talloc_free() to free the string representation if it is no longer
729 * needed.
730 *
731 * @return 0 on success, a Kerberos error code otherwise.
732 */
smb_krb5_unparse_name(TALLOC_CTX * mem_ctx,krb5_context context,krb5_const_principal principal,char ** unix_name)733 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
734 krb5_context context,
735 krb5_const_principal principal,
736 char **unix_name)
737 {
738 krb5_error_code ret;
739 char *utf8_name;
740 size_t converted_size;
741
742 *unix_name = NULL;
743 ret = krb5_unparse_name(context, principal, &utf8_name);
744 if (ret) {
745 return ret;
746 }
747
748 if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
749 krb5_free_unparsed_name(context, utf8_name);
750 return ENOMEM;
751 }
752 krb5_free_unparsed_name(context, utf8_name);
753 return 0;
754 }
755
756 /**
757 * @brief Free the contents of a krb5_data structure and zero the data field.
758 *
759 * @param[in] context The krb5 context
760 *
761 * @param[in] pdata The data structure to free contents of
762 *
763 * This function frees the contents, not the structure itself.
764 */
smb_krb5_free_data_contents(krb5_context context,krb5_data * pdata)765 void smb_krb5_free_data_contents(krb5_context context, krb5_data *pdata)
766 {
767 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
768 if (pdata->data) {
769 krb5_free_data_contents(context, pdata);
770 }
771 #elif defined(HAVE_KRB5_DATA_FREE)
772 krb5_data_free(context, pdata);
773 #else
774 SAFE_FREE(pdata->data);
775 #endif
776 }
777
778 /*
779 * @brief copy a buffer into a krb5_data struct
780 *
781 * @param[in] p The krb5_data
782 * @param[in] data The data to copy
783 * @param[in] length The length of the data to copy
784 * @return krb5_error_code
785 *
786 * Caller has to free krb5_data with smb_krb5_free_data_contents().
787 */
smb_krb5_copy_data_contents(krb5_data * p,const void * data,size_t len)788 krb5_error_code smb_krb5_copy_data_contents(krb5_data *p,
789 const void *data,
790 size_t len)
791 {
792 #if defined(HAVE_KRB5_DATA_COPY)
793 return krb5_data_copy(p, data, len);
794 #else
795 if (len) {
796 p->data = malloc(len);
797 if (p->data == NULL) {
798 return ENOMEM;
799 }
800 memmove(p->data, data, len);
801 } else {
802 p->data = NULL;
803 }
804 p->length = len;
805 p->magic = KV5M_DATA;
806 return 0;
807 #endif
808 }
809
smb_krb5_get_smb_session_key(TALLOC_CTX * mem_ctx,krb5_context context,krb5_auth_context auth_context,DATA_BLOB * session_key,bool remote)810 bool smb_krb5_get_smb_session_key(TALLOC_CTX *mem_ctx,
811 krb5_context context,
812 krb5_auth_context auth_context,
813 DATA_BLOB *session_key,
814 bool remote)
815 {
816 krb5_keyblock *skey = NULL;
817 krb5_error_code err = 0;
818 bool ret = false;
819
820 if (remote) {
821 #ifdef HAVE_KRB5_AUTH_CON_GETRECVSUBKEY
822 err = krb5_auth_con_getrecvsubkey(context,
823 auth_context,
824 &skey);
825 #else /* HAVE_KRB5_AUTH_CON_GETRECVSUBKEY */
826 err = krb5_auth_con_getremotesubkey(context,
827 auth_context, &skey);
828 #endif /* HAVE_KRB5_AUTH_CON_GETRECVSUBKEY */
829 } else {
830 #ifdef HAVE_KRB5_AUTH_CON_GETSENDSUBKEY
831 err = krb5_auth_con_getsendsubkey(context,
832 auth_context,
833 &skey);
834 #else /* HAVE_KRB5_AUTH_CON_GETSENDSUBKEY */
835 err = krb5_auth_con_getlocalsubkey(context,
836 auth_context, &skey);
837 #endif /* HAVE_KRB5_AUTH_CON_GETSENDSUBKEY */
838 }
839
840 if (err || skey == NULL) {
841 DEBUG(10, ("KRB5 error getting session key %d\n", err));
842 goto done;
843 }
844
845 DEBUG(10, ("Got KRB5 session key of length %d\n",
846 (int)KRB5_KEY_LENGTH(skey)));
847
848 *session_key = data_blob_talloc(mem_ctx,
849 KRB5_KEY_DATA(skey),
850 KRB5_KEY_LENGTH(skey));
851 dump_data_pw("KRB5 Session Key:\n",
852 session_key->data,
853 session_key->length);
854
855 ret = true;
856
857 done:
858 if (skey) {
859 krb5_free_keyblock(context, skey);
860 }
861
862 return ret;
863 }
864
865
866 /**
867 * @brief Get talloced string component of a principal
868 *
869 * @param[in] mem_ctx The TALLOC_CTX
870 * @param[in] context The krb5_context
871 * @param[in] principal The principal
872 * @param[in] component The component
873 * @return string component
874 *
875 * Caller must talloc_free if the return value is not NULL.
876 *
877 */
smb_krb5_principal_get_comp_string(TALLOC_CTX * mem_ctx,krb5_context context,krb5_const_principal principal,unsigned int component)878 char *smb_krb5_principal_get_comp_string(TALLOC_CTX *mem_ctx,
879 krb5_context context,
880 krb5_const_principal principal,
881 unsigned int component)
882 {
883 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING)
884 return talloc_strdup(mem_ctx, krb5_principal_get_comp_string(context, principal, component));
885 #else
886 krb5_data *data;
887
888 if (component >= krb5_princ_size(context, principal)) {
889 return NULL;
890 }
891
892 data = krb5_princ_component(context, principal, component);
893 if (data == NULL) {
894 return NULL;
895 }
896
897 return talloc_strndup(mem_ctx, data->data, data->length);
898 #endif
899 }
900
901 /**
902 * @brief
903 *
904 * @param[in] ccache_string A string pointing to the cache to renew the ticket
905 * (e.g. FILE:/tmp/krb5cc_0) or NULL. If the principal
906 * ccache has not been specified, the default ccache
907 * will be used.
908 *
909 * @param[in] client_string The client principal string (e.g. user@SAMBA.SITE)
910 * or NULL. If the principal string has not been
911 * specified, the principal from the ccache will be
912 * retrieved.
913 *
914 * @param[in] service_string The service ticket string
915 * (e.g. krbtgt/SAMBA.SITE@SAMBA.SITE) or NULL. If
916 * the sevice ticket is specified, it is parsed (
917 * with the realm part ignored) and used as the
918 * server principal of the credential. Otherwise
919 * the ticket-granting service is used.
920 *
921 * @param[in] expire_time A pointer to store the credentials end time or
922 * NULL.
923 *
924 * @return 0 on Succes, a Kerberos error code otherwise.
925 */
smb_krb5_renew_ticket(const char * ccache_string,const char * client_string,const char * service_string,time_t * expire_time)926 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,
927 const char *client_string,
928 const char *service_string,
929 time_t *expire_time)
930 {
931 krb5_error_code ret;
932 krb5_context context = NULL;
933 krb5_ccache ccache = NULL;
934 krb5_principal client = NULL;
935 krb5_creds creds, creds_in;
936
937 ZERO_STRUCT(creds);
938 ZERO_STRUCT(creds_in);
939
940 ret = smb_krb5_init_context_common(&context);
941 if (ret) {
942 DBG_ERR("kerberos init context failed (%s)\n",
943 error_message(ret));
944 goto done;
945 }
946
947 if (!ccache_string) {
948 ccache_string = krb5_cc_default_name(context);
949 }
950
951 if (!ccache_string) {
952 ret = EINVAL;
953 goto done;
954 }
955
956 DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
957
958 /* FIXME: we should not fall back to defaults */
959 ret = krb5_cc_resolve(context, discard_const_p(char, ccache_string), &ccache);
960 if (ret) {
961 goto done;
962 }
963
964 if (client_string) {
965 ret = smb_krb5_parse_name(context, client_string, &client);
966 if (ret) {
967 goto done;
968 }
969 } else {
970 ret = krb5_cc_get_principal(context, ccache, &client);
971 if (ret) {
972 goto done;
973 }
974 }
975
976 ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string));
977 if (ret) {
978 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
979 goto done;
980 }
981
982 /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
983 ret = krb5_cc_initialize(context, ccache, client);
984 if (ret) {
985 goto done;
986 }
987
988 ret = krb5_cc_store_cred(context, ccache, &creds);
989
990 if (expire_time) {
991 *expire_time = (time_t) creds.times.endtime;
992 }
993
994 done:
995 krb5_free_cred_contents(context, &creds_in);
996 krb5_free_cred_contents(context, &creds);
997
998 if (client) {
999 krb5_free_principal(context, client);
1000 }
1001 if (ccache) {
1002 krb5_cc_close(context, ccache);
1003 }
1004 if (context) {
1005 krb5_free_context(context);
1006 }
1007
1008 return ret;
1009 }
1010
1011 /**
1012 * @brief Free the data stored in an smb_krb5_addresses structure.
1013 *
1014 * @param[in] context The library context
1015 *
1016 * @param[in] addr The address structure to free.
1017 *
1018 * @return 0 on success, a Kerberos error code otherwise.
1019 */
smb_krb5_free_addresses(krb5_context context,smb_krb5_addresses * addr)1020 krb5_error_code smb_krb5_free_addresses(krb5_context context,
1021 smb_krb5_addresses *addr)
1022 {
1023 krb5_error_code ret = 0;
1024 if (addr == NULL) {
1025 return ret;
1026 }
1027 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1028 krb5_free_addresses(context, addr->addrs);
1029 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1030 ret = krb5_free_addresses(context, addr->addrs);
1031 SAFE_FREE(addr->addrs);
1032 #endif
1033 SAFE_FREE(addr);
1034 addr = NULL;
1035 return ret;
1036 }
1037
1038 #define MAX_NETBIOSNAME_LEN 16
1039
1040 /**
1041 * @brief Add a netbios name to the array of addresses
1042 *
1043 * @param[in] kerb_addr A pointer to the smb_krb5_addresses to add the
1044 * netbios name to.
1045 *
1046 * @param[in] netbios_name The netbios name to add.
1047 *
1048 * @return 0 on success, a Kerberos error code otherwise.
1049 */
smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses ** kerb_addr,const char * netbios_name)1050 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr,
1051 const char *netbios_name)
1052 {
1053 krb5_error_code ret = 0;
1054 char buf[MAX_NETBIOSNAME_LEN];
1055 int len;
1056 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1057 krb5_address **addrs = NULL;
1058 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1059 krb5_addresses *addrs = NULL;
1060 #endif
1061
1062 *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1063 if (*kerb_addr == NULL) {
1064 return ENOMEM;
1065 }
1066
1067 /* temporarily duplicate put_name() code here to avoid dependency
1068 * issues for a 5 lines function */
1069 len = strlen(netbios_name);
1070 memcpy(buf, netbios_name,
1071 (len < MAX_NETBIOSNAME_LEN) ? len : MAX_NETBIOSNAME_LEN - 1);
1072 if (len < MAX_NETBIOSNAME_LEN - 1) {
1073 memset(buf + len, ' ', MAX_NETBIOSNAME_LEN - 1 - len);
1074 }
1075 buf[MAX_NETBIOSNAME_LEN - 1] = 0x20;
1076
1077 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1078 {
1079 int num_addr = 2;
1080
1081 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1082 if (addrs == NULL) {
1083 SAFE_FREE(*kerb_addr);
1084 return ENOMEM;
1085 }
1086
1087 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1088
1089 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1090 if (addrs[0] == NULL) {
1091 SAFE_FREE(addrs);
1092 SAFE_FREE(*kerb_addr);
1093 return ENOMEM;
1094 }
1095
1096 addrs[0]->magic = KV5M_ADDRESS;
1097 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1098 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1099 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1100 if (addrs[0]->contents == NULL) {
1101 SAFE_FREE(addrs[0]);
1102 SAFE_FREE(addrs);
1103 SAFE_FREE(*kerb_addr);
1104 return ENOMEM;
1105 }
1106
1107 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1108
1109 addrs[1] = NULL;
1110 }
1111 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1112 {
1113 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1114 if (addrs == NULL) {
1115 SAFE_FREE(*kerb_addr);
1116 return ENOMEM;
1117 }
1118
1119 memset(addrs, 0, sizeof(krb5_addresses));
1120
1121 addrs->len = 1;
1122 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1123 if (addrs->val == NULL) {
1124 SAFE_FREE(addrs);
1125 SAFE_FREE(*kerb_addr);
1126 return ENOMEM;
1127 }
1128
1129 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1130 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1131 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1132 if (addrs->val[0].address.data == NULL) {
1133 SAFE_FREE(addrs->val);
1134 SAFE_FREE(addrs);
1135 SAFE_FREE(*kerb_addr);
1136 return ENOMEM;
1137 }
1138
1139 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1140 }
1141 #else
1142 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1143 #endif
1144 (*kerb_addr)->addrs = addrs;
1145
1146 return ret;
1147 }
1148
1149 /**
1150 * @brief Get the enctype from a key table entry
1151 *
1152 * @param[in] kt_entry Key table entry to get the enctype from.
1153 *
1154 * @return The enctype from the entry.
1155 */
smb_krb5_kt_get_enctype_from_entry(krb5_keytab_entry * kt_entry)1156 krb5_enctype smb_krb5_kt_get_enctype_from_entry(krb5_keytab_entry *kt_entry)
1157 {
1158 return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1159 }
1160
1161 /**
1162 * @brief Free the contents of a key table entry.
1163 *
1164 * @param[in] context The library context.
1165 *
1166 * @param[in] kt_entry The key table entry to free the contents of.
1167 *
1168 * @return 0 on success, a Kerberos error code otherwise.
1169 *
1170 * The pointer itself is not freed.
1171 */
smb_krb5_kt_free_entry(krb5_context context,krb5_keytab_entry * kt_entry)1172 krb5_error_code smb_krb5_kt_free_entry(krb5_context context,
1173 krb5_keytab_entry *kt_entry)
1174 {
1175 /* Try krb5_free_keytab_entry_contents first, since
1176 * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
1177 * krb5_kt_free_entry but only has a prototype for the first, while the
1178 * second is considered private.
1179 */
1180 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
1181 return krb5_free_keytab_entry_contents(context, kt_entry);
1182 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
1183 return krb5_kt_free_entry(context, kt_entry);
1184 #else
1185 #error UNKNOWN_KT_FREE_FUNCTION
1186 #endif
1187 }
1188
1189
1190 /**
1191 * @brief Convert an encryption type to a string.
1192 *
1193 * @param[in] context The library context.
1194 *
1195 * @param[in] enctype The encryption type.
1196 *
1197 * @param[in] etype_s A pointer to store the allocated encryption type as a
1198 * string.
1199 *
1200 * @return 0 on success, a Kerberos error code otherwise.
1201 *
1202 * The caller needs to free the allocated string etype_s.
1203 */
smb_krb5_enctype_to_string(krb5_context context,krb5_enctype enctype,char ** etype_s)1204 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1205 krb5_enctype enctype,
1206 char **etype_s)
1207 {
1208 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1209 return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1210 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1211 char buf[256];
1212 krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1213 if (ret) {
1214 return ret;
1215 }
1216 *etype_s = SMB_STRDUP(buf);
1217 if (!*etype_s) {
1218 return ENOMEM;
1219 }
1220 return ret;
1221 #else
1222 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1223 #endif
1224 }
1225
1226 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1227 #ifndef MAX_KEYTAB_NAME_LEN
1228 #define MAX_KEYTAB_NAME_LEN 1100
1229 #endif
1230
1231 /**
1232 * @brief Open a key table readonly or with readwrite access.
1233 *
1234 * Allows one to use a different keytab than the default one using a relative
1235 * path to the keytab.
1236 *
1237 * @param[in] context The library context
1238 *
1239 * @param[in] keytab_name_req The path to the key table.
1240 *
1241 * @param[in] write_access Open with readwrite access.
1242 *
1243 * @param[in] keytab A pointer o the opended key table.
1244 *
1245 * The keytab pointer should be freed using krb5_kt_close().
1246 *
1247 * @return 0 on success, a Kerberos error code otherwise.
1248 */
smb_krb5_kt_open_relative(krb5_context context,const char * keytab_name_req,bool write_access,krb5_keytab * keytab)1249 krb5_error_code smb_krb5_kt_open_relative(krb5_context context,
1250 const char *keytab_name_req,
1251 bool write_access,
1252 krb5_keytab *keytab)
1253 {
1254 krb5_error_code ret = 0;
1255 TALLOC_CTX *mem_ctx;
1256 char keytab_string[MAX_KEYTAB_NAME_LEN];
1257 char *kt_str = NULL;
1258 bool found_valid_name = false;
1259 const char *pragma = "FILE";
1260 const char *tmp = NULL;
1261
1262 if (!write_access && !keytab_name_req) {
1263 /* caller just wants to read the default keytab readonly, so be it */
1264 return krb5_kt_default(context, keytab);
1265 }
1266
1267 mem_ctx = talloc_init("smb_krb5_open_keytab");
1268 if (!mem_ctx) {
1269 return ENOMEM;
1270 }
1271
1272 #ifdef HAVE_WRFILE_KEYTAB
1273 if (write_access) {
1274 pragma = "WRFILE";
1275 }
1276 #endif
1277
1278 if (keytab_name_req) {
1279
1280 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1281 ret = KRB5_CONFIG_NOTENUFSPACE;
1282 goto out;
1283 }
1284
1285 if ((strncmp(keytab_name_req, "WRFILE:", 7) == 0) ||
1286 (strncmp(keytab_name_req, "FILE:", 5) == 0)) {
1287 tmp = keytab_name_req;
1288 goto resolve;
1289 }
1290
1291 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1292 if (!tmp) {
1293 ret = ENOMEM;
1294 goto out;
1295 }
1296
1297 goto resolve;
1298 }
1299
1300 /* we need to handle more complex keytab_strings, like:
1301 * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1302
1303 ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1304 if (ret) {
1305 goto out;
1306 }
1307
1308 DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1309
1310 tmp = talloc_strdup(mem_ctx, keytab_string);
1311 if (!tmp) {
1312 ret = ENOMEM;
1313 goto out;
1314 }
1315
1316 if (strncmp(tmp, "ANY:", 4) == 0) {
1317 tmp += 4;
1318 }
1319
1320 memset(&keytab_string, '\0', sizeof(keytab_string));
1321
1322 while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1323 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1324 found_valid_name = true;
1325 tmp = kt_str;
1326 tmp += 7;
1327 }
1328
1329 if (strncmp(kt_str, "FILE:", 5) == 0) {
1330 found_valid_name = true;
1331 tmp = kt_str;
1332 tmp += 5;
1333 }
1334
1335 if (tmp[0] == '/') {
1336 /* Treat as a FILE: keytab definition. */
1337 found_valid_name = true;
1338 }
1339
1340 if (found_valid_name) {
1341 if (tmp[0] != '/') {
1342 ret = KRB5_KT_BADNAME;
1343 goto out;
1344 }
1345
1346 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1347 if (!tmp) {
1348 ret = ENOMEM;
1349 goto out;
1350 }
1351 break;
1352 }
1353 }
1354
1355 if (!found_valid_name) {
1356 ret = KRB5_KT_UNKNOWN_TYPE;
1357 goto out;
1358 }
1359
1360 resolve:
1361 DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1362 ret = krb5_kt_resolve(context, tmp, keytab);
1363
1364 out:
1365 TALLOC_FREE(mem_ctx);
1366 return ret;
1367 }
1368
1369 /**
1370 * @brief Open a key table readonly or with readwrite access.
1371 *
1372 * Allows one to use a different keytab than the default one. The path needs to be
1373 * an absolute path or an error will be returned.
1374 *
1375 * @param[in] context The library context
1376 *
1377 * @param[in] keytab_name_req The path to the key table.
1378 *
1379 * @param[in] write_access Open with readwrite access.
1380 *
1381 * @param[in] keytab A pointer o the opended key table.
1382 *
1383 * The keytab pointer should be freed using krb5_kt_close().
1384 *
1385 * @return 0 on success, a Kerberos error code otherwise.
1386 */
smb_krb5_kt_open(krb5_context context,const char * keytab_name_req,bool write_access,krb5_keytab * keytab)1387 krb5_error_code smb_krb5_kt_open(krb5_context context,
1388 const char *keytab_name_req,
1389 bool write_access,
1390 krb5_keytab *keytab)
1391 {
1392 int cmp;
1393
1394 if (keytab_name_req == NULL) {
1395 return KRB5_KT_BADNAME;
1396 }
1397
1398 if (keytab_name_req[0] == '/') {
1399 goto open_keytab;
1400 }
1401
1402 cmp = strncmp(keytab_name_req, "FILE:/", 6);
1403 if (cmp == 0) {
1404 goto open_keytab;
1405 }
1406
1407 cmp = strncmp(keytab_name_req, "WRFILE:/", 8);
1408 if (cmp == 0) {
1409 goto open_keytab;
1410 }
1411
1412 DBG_WARNING("ERROR: Invalid keytab name: %s\n", keytab_name_req);
1413
1414 return KRB5_KT_BADNAME;
1415
1416 open_keytab:
1417 return smb_krb5_kt_open_relative(context,
1418 keytab_name_req,
1419 write_access,
1420 keytab);
1421 }
1422
1423 /**
1424 * @brief Get a key table name.
1425 *
1426 * @param[in] mem_ctx The talloc context to use for allocation.
1427 *
1428 * @param[in] context The library context.
1429 *
1430 * @param[in] keytab The key table to get the name from.
1431 *
1432 * @param[in] keytab_name A talloc'ed string of the key table name.
1433 *
1434 * The talloc'ed name string needs to be freed with talloc_free().
1435 *
1436 * @return 0 on success, a Kerberos error code otherwise.
1437 */
smb_krb5_kt_get_name(TALLOC_CTX * mem_ctx,krb5_context context,krb5_keytab keytab,const char ** keytab_name)1438 krb5_error_code smb_krb5_kt_get_name(TALLOC_CTX *mem_ctx,
1439 krb5_context context,
1440 krb5_keytab keytab,
1441 const char **keytab_name)
1442 {
1443 char keytab_string[MAX_KEYTAB_NAME_LEN];
1444 krb5_error_code ret = 0;
1445
1446 ret = krb5_kt_get_name(context, keytab,
1447 keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1448 if (ret) {
1449 return ret;
1450 }
1451
1452 *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1453 if (!*keytab_name) {
1454 return ENOMEM;
1455 }
1456
1457 return ret;
1458 }
1459
1460 /**
1461 * @brief Seek and delete old entries in a keytab based on the passed
1462 * principal.
1463 *
1464 * @param[in] context The KRB5 context to use.
1465 *
1466 * @param[in] keytab The keytab to operate on.
1467 *
1468 * @param[in] kvno The kvnco to use.
1469 *
1470 * @param[in] princ_s The principal as a string to search for.
1471 *
1472 * @param[in] princ The principal as a krb5_principal to search for.
1473 *
1474 * @param[in] flush Whether to flush the complete keytab.
1475 *
1476 * @param[in] keep_old_entries Keep the entry with the previous kvno.
1477 *
1478 * @retval 0 on Sucess
1479 *
1480 * @return An appropriate KRB5 error code.
1481 */
smb_krb5_kt_seek_and_delete_old_entries(krb5_context context,krb5_keytab keytab,krb5_kvno kvno,krb5_enctype enctype,const char * princ_s,krb5_principal princ,bool flush,bool keep_old_entries)1482 krb5_error_code smb_krb5_kt_seek_and_delete_old_entries(krb5_context context,
1483 krb5_keytab keytab,
1484 krb5_kvno kvno,
1485 krb5_enctype enctype,
1486 const char *princ_s,
1487 krb5_principal princ,
1488 bool flush,
1489 bool keep_old_entries)
1490 {
1491 krb5_error_code ret;
1492 krb5_kt_cursor cursor;
1493 krb5_keytab_entry kt_entry;
1494 char *ktprinc = NULL;
1495 krb5_kvno old_kvno = kvno - 1;
1496 TALLOC_CTX *tmp_ctx;
1497
1498 ZERO_STRUCT(cursor);
1499 ZERO_STRUCT(kt_entry);
1500
1501 ret = krb5_kt_start_seq_get(context, keytab, &cursor);
1502 if (ret == KRB5_KT_END || ret == ENOENT ) {
1503 /* no entries */
1504 return 0;
1505 }
1506
1507 tmp_ctx = talloc_new(NULL);
1508 if (tmp_ctx == NULL) {
1509 return ENOMEM;
1510 }
1511
1512 DEBUG(3, (__location__ ": Will try to delete old keytab entries\n"));
1513 while (!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) {
1514 bool name_ok = false;
1515 krb5_enctype kt_entry_enctype =
1516 smb_krb5_kt_get_enctype_from_entry(&kt_entry);
1517
1518 if (!flush && (princ_s != NULL)) {
1519 ret = smb_krb5_unparse_name(tmp_ctx, context,
1520 kt_entry.principal,
1521 &ktprinc);
1522 if (ret) {
1523 DEBUG(1, (__location__
1524 ": smb_krb5_unparse_name failed "
1525 "(%s)\n", error_message(ret)));
1526 goto out;
1527 }
1528
1529 #ifdef HAVE_KRB5_KT_COMPARE
1530 name_ok = krb5_kt_compare(context, &kt_entry,
1531 princ, 0, 0);
1532 #else
1533 name_ok = (strcmp(ktprinc, princ_s) == 0);
1534 #endif
1535
1536 if (!name_ok) {
1537 DEBUG(10, (__location__ ": ignoring keytab "
1538 "entry principal %s, kvno = %d\n",
1539 ktprinc, kt_entry.vno));
1540
1541 /* Not a match,
1542 * just free this entry and continue. */
1543 ret = smb_krb5_kt_free_entry(context,
1544 &kt_entry);
1545 ZERO_STRUCT(kt_entry);
1546 if (ret) {
1547 DEBUG(1, (__location__
1548 ": smb_krb5_kt_free_entry "
1549 "failed (%s)\n",
1550 error_message(ret)));
1551 goto out;
1552 }
1553
1554 TALLOC_FREE(ktprinc);
1555 continue;
1556 }
1557
1558 TALLOC_FREE(ktprinc);
1559 }
1560
1561 /*------------------------------------------------------------
1562 * Save the entries with kvno - 1. This is what microsoft does
1563 * to allow people with existing sessions that have kvno - 1
1564 * to still work. Otherwise, when the password for the machine
1565 * changes, all kerberizied sessions will 'break' until either
1566 * the client reboots or the client's session key expires and
1567 * they get a new session ticket with the new kvno.
1568 * Some keytab files only store the kvno in 8bits, limit
1569 * the compare accordingly.
1570 */
1571
1572 if (!flush && ((kt_entry.vno & 0xff) == (old_kvno & 0xff))) {
1573 DEBUG(5, (__location__ ": Saving previous (kvno %d) "
1574 "entry for principal: %s.\n",
1575 old_kvno, princ_s));
1576 continue;
1577 }
1578
1579 if (keep_old_entries) {
1580 DEBUG(5, (__location__ ": Saving old (kvno %d) "
1581 "entry for principal: %s.\n",
1582 kvno, princ_s));
1583 continue;
1584 }
1585
1586 if (!flush &&
1587 ((kt_entry.vno & 0xff) == (kvno & 0xff)) &&
1588 (kt_entry_enctype != enctype))
1589 {
1590 DEBUG(5, (__location__ ": Saving entry with kvno [%d] "
1591 "enctype [%d] for principal: %s.\n",
1592 kvno, kt_entry_enctype, princ_s));
1593 continue;
1594 }
1595
1596 DEBUG(5, (__location__ ": Found old entry for principal: %s "
1597 "(kvno %d) - trying to remove it.\n",
1598 princ_s, kt_entry.vno));
1599
1600 ret = krb5_kt_end_seq_get(context, keytab, &cursor);
1601 ZERO_STRUCT(cursor);
1602 if (ret) {
1603 DEBUG(1, (__location__ ": krb5_kt_end_seq_get() "
1604 "failed (%s)\n", error_message(ret)));
1605 goto out;
1606 }
1607 ret = krb5_kt_remove_entry(context, keytab, &kt_entry);
1608 if (ret) {
1609 DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
1610 "failed (%s)\n", error_message(ret)));
1611 goto out;
1612 }
1613
1614 DEBUG(5, (__location__ ": removed old entry for principal: "
1615 "%s (kvno %d).\n", princ_s, kt_entry.vno));
1616
1617 ret = krb5_kt_start_seq_get(context, keytab, &cursor);
1618 if (ret) {
1619 DEBUG(1, (__location__ ": krb5_kt_start_seq() failed "
1620 "(%s)\n", error_message(ret)));
1621 goto out;
1622 }
1623 ret = smb_krb5_kt_free_entry(context, &kt_entry);
1624 ZERO_STRUCT(kt_entry);
1625 if (ret) {
1626 DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
1627 "failed (%s)\n", error_message(ret)));
1628 goto out;
1629 }
1630 }
1631
1632 out:
1633 talloc_free(tmp_ctx);
1634 if (!all_zero((uint8_t *)&kt_entry, sizeof(kt_entry))) {
1635 smb_krb5_kt_free_entry(context, &kt_entry);
1636 }
1637 if (!all_zero((uint8_t *)&cursor, sizeof(cursor))) {
1638 krb5_kt_end_seq_get(context, keytab, &cursor);
1639 }
1640 return ret;
1641 }
1642
1643 /**
1644 * @brief Add a keytab entry for the given principal
1645 *
1646 * @param[in] context The krb5 context to use.
1647 *
1648 * @param[in] keytab The keytab to add the entry to.
1649 *
1650 * @param[in] kvno The kvno to use.
1651 *
1652 * @param[in] princ_s The principal as a string.
1653 *
1654 * @param[in] salt_principal The salt principal to salt the password with.
1655 * Only needed for keys which support salting.
1656 * If no salt is used set no_salt to false and
1657 * pass NULL here.
1658 *
1659 * @param[in] enctype The encryption type of the keytab entry.
1660 *
1661 * @param[in] password The password of the keytab entry.
1662 *
1663 * @param[in] no_salt If the password should not be salted. Normally
1664 * this is only set to false for encryption types
1665 * which do not support salting like RC4.
1666 *
1667 * @param[in] keep_old_entries Whether to keep or delete old keytab entries.
1668 *
1669 * @retval 0 on Success
1670 *
1671 * @return A corresponding KRB5 error code.
1672 *
1673 * @see smb_krb5_kt_open()
1674 */
smb_krb5_kt_add_entry(krb5_context context,krb5_keytab keytab,krb5_kvno kvno,const char * princ_s,const char * salt_principal,krb5_enctype enctype,krb5_data * password,bool no_salt,bool keep_old_entries)1675 krb5_error_code smb_krb5_kt_add_entry(krb5_context context,
1676 krb5_keytab keytab,
1677 krb5_kvno kvno,
1678 const char *princ_s,
1679 const char *salt_principal,
1680 krb5_enctype enctype,
1681 krb5_data *password,
1682 bool no_salt,
1683 bool keep_old_entries)
1684 {
1685 krb5_error_code ret;
1686 krb5_keytab_entry kt_entry;
1687 krb5_principal princ = NULL;
1688 krb5_keyblock *keyp;
1689
1690 ZERO_STRUCT(kt_entry);
1691
1692 ret = smb_krb5_parse_name(context, princ_s, &princ);
1693 if (ret) {
1694 DEBUG(1, (__location__ ": smb_krb5_parse_name(%s) "
1695 "failed (%s)\n", princ_s, error_message(ret)));
1696 goto out;
1697 }
1698
1699 /* Seek and delete old keytab entries */
1700 ret = smb_krb5_kt_seek_and_delete_old_entries(context,
1701 keytab,
1702 kvno,
1703 enctype,
1704 princ_s,
1705 princ,
1706 false,
1707 keep_old_entries);
1708 if (ret) {
1709 goto out;
1710 }
1711
1712 /* If we get here, we have deleted all the old entries with kvno's
1713 * not equal to the current kvno-1. */
1714
1715 keyp = KRB5_KT_KEY(&kt_entry);
1716
1717 if (no_salt) {
1718 KRB5_KEY_DATA(keyp) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
1719 if (KRB5_KEY_DATA(keyp) == NULL) {
1720 ret = ENOMEM;
1721 goto out;
1722 }
1723 memcpy(KRB5_KEY_DATA(keyp), password->data, password->length);
1724 KRB5_KEY_LENGTH(keyp) = password->length;
1725 KRB5_KEY_TYPE(keyp) = enctype;
1726 } else {
1727 krb5_principal salt_princ = NULL;
1728
1729 /* Now add keytab entries for all encryption types */
1730 ret = smb_krb5_parse_name(context, salt_principal, &salt_princ);
1731 if (ret) {
1732 DBG_WARNING("krb5_parse_name(%s) failed (%s)\n",
1733 salt_principal, error_message(ret));
1734 goto out;
1735 }
1736
1737 ret = smb_krb5_create_key_from_string(context,
1738 salt_princ,
1739 NULL,
1740 password,
1741 enctype,
1742 keyp);
1743 krb5_free_principal(context, salt_princ);
1744 if (ret != 0) {
1745 goto out;
1746 }
1747 }
1748
1749 kt_entry.principal = princ;
1750 kt_entry.vno = kvno;
1751
1752 DEBUG(3, (__location__ ": adding keytab entry for (%s) with "
1753 "encryption type (%d) and version (%d)\n",
1754 princ_s, enctype, kt_entry.vno));
1755 ret = krb5_kt_add_entry(context, keytab, &kt_entry);
1756 krb5_free_keyblock_contents(context, keyp);
1757 ZERO_STRUCT(kt_entry);
1758 if (ret) {
1759 DEBUG(1, (__location__ ": adding entry to keytab "
1760 "failed (%s)\n", error_message(ret)));
1761 goto out;
1762 }
1763
1764 out:
1765 if (princ) {
1766 krb5_free_principal(context, princ);
1767 }
1768
1769 return ret;
1770 }
1771
1772 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1773 defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1774 defined(HAVE_KRB5_GET_CREDS)
smb_krb5_get_credentials_for_user_opt(krb5_context context,krb5_ccache ccache,krb5_principal me,krb5_principal server,krb5_principal impersonate_princ,krb5_creds ** out_creds)1775 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1776 krb5_ccache ccache,
1777 krb5_principal me,
1778 krb5_principal server,
1779 krb5_principal impersonate_princ,
1780 krb5_creds **out_creds)
1781 {
1782 krb5_error_code ret;
1783 krb5_get_creds_opt opt;
1784
1785 ret = krb5_get_creds_opt_alloc(context, &opt);
1786 if (ret) {
1787 goto done;
1788 }
1789 krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1790
1791 if (impersonate_princ) {
1792 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1793 impersonate_princ);
1794 if (ret) {
1795 goto done;
1796 }
1797 }
1798
1799 ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1800 if (ret) {
1801 goto done;
1802 }
1803
1804 done:
1805 if (opt) {
1806 krb5_get_creds_opt_free(context, opt);
1807 }
1808 return ret;
1809 }
1810 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1811
1812 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1813
1814 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1815 krb5_error_code KRB5_CALLCONV
1816 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1817 krb5_ccache ccache, krb5_creds *in_creds,
1818 krb5_data *subject_cert,
1819 krb5_creds **out_creds);
1820 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1821
smb_krb5_get_credentials_for_user(krb5_context context,krb5_ccache ccache,krb5_principal me,krb5_principal server,krb5_principal impersonate_princ,krb5_creds ** out_creds)1822 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1823 krb5_ccache ccache,
1824 krb5_principal me,
1825 krb5_principal server,
1826 krb5_principal impersonate_princ,
1827 krb5_creds **out_creds)
1828 {
1829 krb5_error_code ret;
1830 krb5_creds in_creds;
1831
1832 ZERO_STRUCT(in_creds);
1833
1834 if (impersonate_princ) {
1835
1836 in_creds.server = me;
1837 in_creds.client = impersonate_princ;
1838
1839 ret = krb5_get_credentials_for_user(context,
1840 0, /* krb5_flags options */
1841 ccache,
1842 &in_creds,
1843 NULL, /* krb5_data *subject_cert */
1844 out_creds);
1845 } else {
1846 in_creds.client = me;
1847 in_creds.server = server;
1848
1849 ret = krb5_get_credentials(context, 0, ccache,
1850 &in_creds, out_creds);
1851 }
1852
1853 return ret;
1854 }
1855 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1856
1857 /*
1858 * smb_krb5_get_credentials
1859 *
1860 * @brief Get krb5 credentials for a server
1861 *
1862 * @param[in] context An initialized krb5_context
1863 * @param[in] ccache An initialized krb5_ccache
1864 * @param[in] me The krb5_principal of the caller
1865 * @param[in] server The krb5_principal of the requested service
1866 * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1867 * @param[out] out_creds The returned krb5_creds structure
1868 * @return krb5_error_code
1869 *
1870 */
smb_krb5_get_credentials(krb5_context context,krb5_ccache ccache,krb5_principal me,krb5_principal server,krb5_principal impersonate_princ,krb5_creds ** out_creds)1871 krb5_error_code smb_krb5_get_credentials(krb5_context context,
1872 krb5_ccache ccache,
1873 krb5_principal me,
1874 krb5_principal server,
1875 krb5_principal impersonate_princ,
1876 krb5_creds **out_creds)
1877 {
1878 krb5_error_code ret;
1879 krb5_creds *creds = NULL;
1880
1881 if (out_creds != NULL) {
1882 *out_creds = NULL;
1883 }
1884
1885 if (impersonate_princ) {
1886 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
1887 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
1888 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
1889 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
1890 #else
1891 ret = ENOTSUP;
1892 #endif
1893 } else {
1894 krb5_creds in_creds;
1895
1896 ZERO_STRUCT(in_creds);
1897
1898 in_creds.client = me;
1899 in_creds.server = server;
1900
1901 ret = krb5_get_credentials(context, 0, ccache,
1902 &in_creds, &creds);
1903 }
1904 if (ret) {
1905 goto done;
1906 }
1907
1908 if (out_creds) {
1909 *out_creds = creds;
1910 }
1911
1912 done:
1913 if (creds && ret) {
1914 krb5_free_creds(context, creds);
1915 }
1916
1917 return ret;
1918 }
1919
1920 /**
1921 * @brief Initialize a krb5_keyblock with the given data.
1922 *
1923 * Initialized a new keyblock, allocates the contents fo the key and
1924 * copies the data into the keyblock.
1925 *
1926 * @param[in] context The library context
1927 *
1928 * @param[in] enctype The encryption type.
1929 *
1930 * @param[in] data The date to initialize the keyblock with.
1931 *
1932 * @param[in] length The length of the keyblock.
1933 *
1934 * @param[in] key Newly allocated keyblock structure.
1935 *
1936 * The key date must be freed using krb5_free_keyblock_contents() when it is
1937 * no longer needed.
1938 *
1939 * @return 0 on success, a Kerberos error code otherwise.
1940 */
smb_krb5_keyblock_init_contents(krb5_context context,krb5_enctype enctype,const void * data,size_t length,krb5_keyblock * key)1941 krb5_error_code smb_krb5_keyblock_init_contents(krb5_context context,
1942 krb5_enctype enctype,
1943 const void *data,
1944 size_t length,
1945 krb5_keyblock *key)
1946 {
1947 #if defined(HAVE_KRB5_KEYBLOCK_INIT)
1948 return krb5_keyblock_init(context, enctype, data, length, key);
1949 #else
1950 memset(key, 0, sizeof(krb5_keyblock));
1951 KRB5_KEY_DATA(key) = SMB_MALLOC(length);
1952 if (NULL == KRB5_KEY_DATA(key)) {
1953 return ENOMEM;
1954 }
1955 memcpy(KRB5_KEY_DATA(key), data, length);
1956 KRB5_KEY_LENGTH(key) = length;
1957 KRB5_KEY_TYPE(key) = enctype;
1958 return 0;
1959 #endif
1960 }
1961
1962 /**
1963 * @brief Simulate a kinit by putting the tgt in the given credential cache.
1964 *
1965 * This function uses a keyblock rather than needing the original password.
1966 *
1967 * @param[in] ctx The library context
1968 *
1969 * @param[in] cc The credential cache to put the tgt in.
1970 *
1971 * @param[in] principal The client princial
1972 *
1973 * @param[in] keyblock The keyblock to use.
1974 *
1975 * @param[in] target_service The service name of the initial credentials (or NULL).
1976 *
1977 * @param[in] krb_options Initial credential options.
1978 *
1979 * @param[in] expire_time A pointer to store the experation time of the
1980 * credentials (or NULL).
1981 *
1982 * @param[in] kdc_time A pointer to store the time when the ticket becomes
1983 * valid (or NULL).
1984 *
1985 * @return 0 on success, a Kerberos error code otherwise.
1986 */
smb_krb5_kinit_keyblock_ccache(krb5_context ctx,krb5_ccache cc,krb5_principal principal,krb5_keyblock * keyblock,const char * target_service,krb5_get_init_creds_opt * krb_options,time_t * expire_time,time_t * kdc_time)1987 krb5_error_code smb_krb5_kinit_keyblock_ccache(krb5_context ctx,
1988 krb5_ccache cc,
1989 krb5_principal principal,
1990 krb5_keyblock *keyblock,
1991 const char *target_service,
1992 krb5_get_init_creds_opt *krb_options,
1993 time_t *expire_time,
1994 time_t *kdc_time)
1995 {
1996 krb5_error_code code = 0;
1997 krb5_creds my_creds;
1998
1999 #if defined(HAVE_KRB5_GET_INIT_CREDS_KEYBLOCK)
2000 code = krb5_get_init_creds_keyblock(ctx, &my_creds, principal,
2001 keyblock, 0, target_service,
2002 krb_options);
2003 #elif defined(HAVE_KRB5_GET_INIT_CREDS_KEYTAB)
2004 {
2005 #define SMB_CREDS_KEYTAB "MEMORY:tmp_kinit_keyblock_ccache"
2006 char tmp_name[64] = {0};
2007 krb5_keytab_entry entry;
2008 krb5_keytab keytab;
2009 int rc;
2010
2011 memset(&entry, 0, sizeof(entry));
2012 entry.principal = principal;
2013 *(KRB5_KT_KEY(&entry)) = *keyblock;
2014
2015 rc = snprintf(tmp_name, sizeof(tmp_name),
2016 "%s-%p",
2017 SMB_CREDS_KEYTAB,
2018 &my_creds);
2019 if (rc < 0) {
2020 return KRB5_KT_BADNAME;
2021 }
2022 code = krb5_kt_resolve(ctx, tmp_name, &keytab);
2023 if (code) {
2024 return code;
2025 }
2026
2027 code = krb5_kt_add_entry(ctx, keytab, &entry);
2028 if (code) {
2029 (void)krb5_kt_close(ctx, keytab);
2030 goto done;
2031 }
2032
2033 code = krb5_get_init_creds_keytab(ctx, &my_creds, principal,
2034 keytab, 0, target_service,
2035 krb_options);
2036 (void)krb5_kt_close(ctx, keytab);
2037 }
2038 #else
2039 #error krb5_get_init_creds_keyblock not available!
2040 #endif
2041 if (code) {
2042 return code;
2043 }
2044
2045 #ifndef SAMBA4_USES_HEIMDAL /* MIT */
2046 /*
2047 * We need to store the principal as returned from the KDC to the
2048 * credentials cache. If we don't do that the KRB5 library is not
2049 * able to find the tickets it is looking for
2050 */
2051 principal = my_creds.client;
2052 #endif
2053 code = krb5_cc_initialize(ctx, cc, principal);
2054 if (code) {
2055 goto done;
2056 }
2057
2058 code = krb5_cc_store_cred(ctx, cc, &my_creds);
2059 if (code) {
2060 goto done;
2061 }
2062
2063 if (expire_time) {
2064 *expire_time = (time_t) my_creds.times.endtime;
2065 }
2066
2067 if (kdc_time) {
2068 *kdc_time = (time_t) my_creds.times.starttime;
2069 }
2070
2071 code = 0;
2072 done:
2073 krb5_free_cred_contents(ctx, &my_creds);
2074 return code;
2075 }
2076
2077 /**
2078 * @brief Simulate a kinit by putting the tgt in the given credential cache.
2079 *
2080 * @param[in] ctx The library context
2081 *
2082 * @param[in] cc The credential cache to put the tgt in.
2083 *
2084 * @param[in] principal The client princial
2085 *
2086 * @param[in] password The password (or NULL).
2087 *
2088 * @param[in] target_service The service name of the initial credentials (or NULL).
2089 *
2090 * @param[in] krb_options Initial credential options.
2091 *
2092 * @param[in] expire_time A pointer to store the experation time of the
2093 * credentials (or NULL).
2094 *
2095 * @param[in] kdc_time A pointer to store the time when the ticket becomes
2096 * valid (or NULL).
2097 *
2098 * @return 0 on success, a Kerberos error code otherwise.
2099 */
smb_krb5_kinit_password_ccache(krb5_context ctx,krb5_ccache cc,krb5_principal principal,const char * password,const char * target_service,krb5_get_init_creds_opt * krb_options,time_t * expire_time,time_t * kdc_time)2100 krb5_error_code smb_krb5_kinit_password_ccache(krb5_context ctx,
2101 krb5_ccache cc,
2102 krb5_principal principal,
2103 const char *password,
2104 const char *target_service,
2105 krb5_get_init_creds_opt *krb_options,
2106 time_t *expire_time,
2107 time_t *kdc_time)
2108 {
2109 krb5_error_code code = 0;
2110 krb5_creds my_creds;
2111
2112 code = krb5_get_init_creds_password(ctx, &my_creds, principal,
2113 password, NULL, NULL, 0,
2114 target_service, krb_options);
2115 if (code) {
2116 return code;
2117 }
2118
2119 /*
2120 * We need to store the principal as returned from the KDC to the
2121 * credentials cache. If we don't do that the KRB5 library is not
2122 * able to find the tickets it is looking for
2123 */
2124 principal = my_creds.client;
2125 code = krb5_cc_initialize(ctx, cc, principal);
2126 if (code) {
2127 goto done;
2128 }
2129
2130 code = krb5_cc_store_cred(ctx, cc, &my_creds);
2131 if (code) {
2132 goto done;
2133 }
2134
2135 if (expire_time) {
2136 *expire_time = (time_t) my_creds.times.endtime;
2137 }
2138
2139 if (kdc_time) {
2140 *kdc_time = (time_t) my_creds.times.starttime;
2141 }
2142
2143 code = 0;
2144 done:
2145 krb5_free_cred_contents(ctx, &my_creds);
2146 return code;
2147 }
2148
2149 #ifdef SAMBA4_USES_HEIMDAL
2150 /**
2151 * @brief Simulate a kinit by putting the tgt in the given credential cache.
2152 *
2153 * @param[in] ctx The library context
2154 *
2155 * @param[in] cc The credential cache to store the tgt in.
2156 *
2157 * @param[in] principal The initial client princial.
2158 *
2159 * @param[in] password The password (or NULL).
2160 *
2161 * @param[in] impersonate_principal The impersonatiion principal (or NULL).
2162 *
2163 * @param[in] self_service The local service for S4U2Self if
2164 * impersonate_principal is specified).
2165 *
2166 * @param[in] target_service The service name of the initial credentials
2167 * (kpasswd/REALM or a remote service). It defaults
2168 * to the krbtgt if NULL.
2169 *
2170 * @param[in] krb_options Initial credential options.
2171 *
2172 * @param[in] expire_time A pointer to store the experation time of the
2173 * credentials (or NULL).
2174 *
2175 * @param[in] kdc_time A pointer to store the time when the ticket becomes
2176 * valid (or NULL).
2177 *
2178 * @return 0 on success, a Kerberos error code otherwise.
2179 */
smb_krb5_kinit_s4u2_ccache(krb5_context ctx,krb5_ccache store_cc,krb5_principal init_principal,const char * init_password,krb5_principal impersonate_principal,const char * self_service,const char * target_service,krb5_get_init_creds_opt * krb_options,time_t * expire_time,time_t * kdc_time)2180 krb5_error_code smb_krb5_kinit_s4u2_ccache(krb5_context ctx,
2181 krb5_ccache store_cc,
2182 krb5_principal init_principal,
2183 const char *init_password,
2184 krb5_principal impersonate_principal,
2185 const char *self_service,
2186 const char *target_service,
2187 krb5_get_init_creds_opt *krb_options,
2188 time_t *expire_time,
2189 time_t *kdc_time)
2190 {
2191 krb5_error_code code = 0;
2192 krb5_get_creds_opt options;
2193 krb5_principal store_principal;
2194 krb5_creds store_creds;
2195 krb5_creds *s4u2self_creds;
2196 Ticket s4u2self_ticket;
2197 size_t s4u2self_ticketlen;
2198 krb5_creds *s4u2proxy_creds;
2199 krb5_principal self_princ;
2200 bool s4u2proxy;
2201 krb5_principal target_princ;
2202 krb5_ccache tmp_cc;
2203 const char *self_realm;
2204 const char *client_realm = NULL;
2205 krb5_principal blacklist_principal = NULL;
2206 krb5_principal whitelist_principal = NULL;
2207
2208 code = krb5_get_init_creds_password(ctx, &store_creds,
2209 init_principal,
2210 init_password,
2211 NULL, NULL,
2212 0,
2213 NULL,
2214 krb_options);
2215 if (code != 0) {
2216 return code;
2217 }
2218
2219 store_principal = init_principal;
2220
2221 /*
2222 * We are trying S4U2Self now:
2223 *
2224 * As we do not want to expose our TGT in the
2225 * krb5_ccache, which is also holds the impersonated creds.
2226 *
2227 * Some low level krb5/gssapi function might use the TGT
2228 * identity and let the client act as our machine account.
2229 *
2230 * We need to avoid that and use a temporary krb5_ccache
2231 * in order to pass our TGT to the krb5_get_creds() function.
2232 */
2233 code = krb5_cc_new_unique(ctx, NULL, NULL, &tmp_cc);
2234 if (code != 0) {
2235 krb5_free_cred_contents(ctx, &store_creds);
2236 return code;
2237 }
2238
2239 code = krb5_cc_initialize(ctx, tmp_cc, store_creds.client);
2240 if (code != 0) {
2241 krb5_cc_destroy(ctx, tmp_cc);
2242 krb5_free_cred_contents(ctx, &store_creds);
2243 return code;
2244 }
2245
2246 code = krb5_cc_store_cred(ctx, tmp_cc, &store_creds);
2247 if (code != 0) {
2248 krb5_free_cred_contents(ctx, &store_creds);
2249 krb5_cc_destroy(ctx, tmp_cc);
2250 return code;
2251 }
2252
2253 /*
2254 * we need to remember the client principal of our
2255 * TGT and make sure the KDC does not return this
2256 * in the impersonated tickets. This can happen
2257 * if the KDC does not support S4U2Self and S4U2Proxy.
2258 */
2259 blacklist_principal = store_creds.client;
2260 store_creds.client = NULL;
2261 krb5_free_cred_contents(ctx, &store_creds);
2262
2263 /*
2264 * Check if we also need S4U2Proxy or if S4U2Self is
2265 * enough in order to get a ticket for the target.
2266 */
2267 if (target_service == NULL) {
2268 s4u2proxy = false;
2269 } else if (strcmp(target_service, self_service) == 0) {
2270 s4u2proxy = false;
2271 } else {
2272 s4u2proxy = true;
2273 }
2274
2275 /*
2276 * For S4U2Self we need our own service principal,
2277 * which belongs to our own realm (available on
2278 * our client principal).
2279 */
2280 self_realm = krb5_principal_get_realm(ctx, init_principal);
2281
2282 code = krb5_parse_name(ctx, self_service, &self_princ);
2283 if (code != 0) {
2284 krb5_free_principal(ctx, blacklist_principal);
2285 krb5_cc_destroy(ctx, tmp_cc);
2286 return code;
2287 }
2288
2289 code = krb5_principal_set_realm(ctx, self_princ, self_realm);
2290 if (code != 0) {
2291 krb5_free_principal(ctx, blacklist_principal);
2292 krb5_free_principal(ctx, self_princ);
2293 krb5_cc_destroy(ctx, tmp_cc);
2294 return code;
2295 }
2296
2297 code = krb5_get_creds_opt_alloc(ctx, &options);
2298 if (code != 0) {
2299 krb5_free_principal(ctx, blacklist_principal);
2300 krb5_free_principal(ctx, self_princ);
2301 krb5_cc_destroy(ctx, tmp_cc);
2302 return code;
2303 }
2304
2305 if (s4u2proxy) {
2306 /*
2307 * If we want S4U2Proxy, we need the forwardable flag
2308 * on the S4U2Self ticket.
2309 */
2310 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
2311 }
2312
2313 code = krb5_get_creds_opt_set_impersonate(ctx, options,
2314 impersonate_principal);
2315 if (code != 0) {
2316 krb5_get_creds_opt_free(ctx, options);
2317 krb5_free_principal(ctx, blacklist_principal);
2318 krb5_free_principal(ctx, self_princ);
2319 krb5_cc_destroy(ctx, tmp_cc);
2320 return code;
2321 }
2322
2323 code = krb5_get_creds(ctx, options, tmp_cc,
2324 self_princ, &s4u2self_creds);
2325 krb5_get_creds_opt_free(ctx, options);
2326 krb5_free_principal(ctx, self_princ);
2327 if (code != 0) {
2328 krb5_free_principal(ctx, blacklist_principal);
2329 krb5_cc_destroy(ctx, tmp_cc);
2330 return code;
2331 }
2332
2333 if (!s4u2proxy) {
2334 krb5_cc_destroy(ctx, tmp_cc);
2335
2336 /*
2337 * Now make sure we store the impersonated principal
2338 * and creds instead of the TGT related stuff
2339 * in the krb5_ccache of the caller.
2340 */
2341 code = krb5_copy_creds_contents(ctx, s4u2self_creds,
2342 &store_creds);
2343 krb5_free_creds(ctx, s4u2self_creds);
2344 if (code != 0) {
2345 return code;
2346 }
2347
2348 /*
2349 * It's important to store the principal the KDC
2350 * returned, as otherwise the caller would not find
2351 * the S4U2Self ticket in the krb5_ccache lookup.
2352 */
2353 store_principal = store_creds.client;
2354 goto store;
2355 }
2356
2357 /*
2358 * We are trying S4U2Proxy:
2359 *
2360 * We need the ticket from the S4U2Self step
2361 * and our TGT in order to get the delegated ticket.
2362 */
2363 code = decode_Ticket((const uint8_t *)s4u2self_creds->ticket.data,
2364 s4u2self_creds->ticket.length,
2365 &s4u2self_ticket,
2366 &s4u2self_ticketlen);
2367 if (code != 0) {
2368 krb5_free_creds(ctx, s4u2self_creds);
2369 krb5_free_principal(ctx, blacklist_principal);
2370 krb5_cc_destroy(ctx, tmp_cc);
2371 return code;
2372 }
2373
2374 /*
2375 * we need to remember the client principal of the
2376 * S4U2Self stage and as it needs to match the one we
2377 * will get for the S4U2Proxy stage. We need this
2378 * in order to detect KDCs which does not support S4U2Proxy.
2379 */
2380 whitelist_principal = s4u2self_creds->client;
2381 s4u2self_creds->client = NULL;
2382 krb5_free_creds(ctx, s4u2self_creds);
2383
2384 /*
2385 * For S4U2Proxy we also got a target service principal,
2386 * which also belongs to our own realm (available on
2387 * our client principal).
2388 */
2389 code = krb5_parse_name(ctx, target_service, &target_princ);
2390 if (code != 0) {
2391 free_Ticket(&s4u2self_ticket);
2392 krb5_free_principal(ctx, whitelist_principal);
2393 krb5_free_principal(ctx, blacklist_principal);
2394 krb5_cc_destroy(ctx, tmp_cc);
2395 return code;
2396 }
2397
2398 code = krb5_principal_set_realm(ctx, target_princ, self_realm);
2399 if (code != 0) {
2400 free_Ticket(&s4u2self_ticket);
2401 krb5_free_principal(ctx, target_princ);
2402 krb5_free_principal(ctx, whitelist_principal);
2403 krb5_free_principal(ctx, blacklist_principal);
2404 krb5_cc_destroy(ctx, tmp_cc);
2405 return code;
2406 }
2407
2408 code = krb5_get_creds_opt_alloc(ctx, &options);
2409 if (code != 0) {
2410 free_Ticket(&s4u2self_ticket);
2411 krb5_free_principal(ctx, target_princ);
2412 krb5_free_principal(ctx, whitelist_principal);
2413 krb5_free_principal(ctx, blacklist_principal);
2414 krb5_cc_destroy(ctx, tmp_cc);
2415 return code;
2416 }
2417
2418 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
2419 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_CONSTRAINED_DELEGATION);
2420
2421 code = krb5_get_creds_opt_set_ticket(ctx, options, &s4u2self_ticket);
2422 free_Ticket(&s4u2self_ticket);
2423 if (code != 0) {
2424 krb5_get_creds_opt_free(ctx, options);
2425 krb5_free_principal(ctx, target_princ);
2426 krb5_free_principal(ctx, whitelist_principal);
2427 krb5_free_principal(ctx, blacklist_principal);
2428 krb5_cc_destroy(ctx, tmp_cc);
2429 return code;
2430 }
2431
2432 code = krb5_get_creds(ctx, options, tmp_cc,
2433 target_princ, &s4u2proxy_creds);
2434 krb5_get_creds_opt_free(ctx, options);
2435 krb5_free_principal(ctx, target_princ);
2436 krb5_cc_destroy(ctx, tmp_cc);
2437 if (code != 0) {
2438 krb5_free_principal(ctx, whitelist_principal);
2439 krb5_free_principal(ctx, blacklist_principal);
2440 return code;
2441 }
2442
2443 /*
2444 * Now make sure we store the impersonated principal
2445 * and creds instead of the TGT related stuff
2446 * in the krb5_ccache of the caller.
2447 */
2448 code = krb5_copy_creds_contents(ctx, s4u2proxy_creds,
2449 &store_creds);
2450 krb5_free_creds(ctx, s4u2proxy_creds);
2451 if (code != 0) {
2452 krb5_free_principal(ctx, whitelist_principal);
2453 krb5_free_principal(ctx, blacklist_principal);
2454 return code;
2455 }
2456
2457 /*
2458 * It's important to store the principal the KDC
2459 * returned, as otherwise the caller would not find
2460 * the S4U2Self ticket in the krb5_ccache lookup.
2461 */
2462 store_principal = store_creds.client;
2463
2464 store:
2465 if (blacklist_principal &&
2466 krb5_principal_compare(ctx, store_creds.client, blacklist_principal)) {
2467 char *sp = NULL;
2468 char *ip = NULL;
2469
2470 code = krb5_unparse_name(ctx, blacklist_principal, &sp);
2471 if (code != 0) {
2472 sp = NULL;
2473 }
2474 code = krb5_unparse_name(ctx, impersonate_principal, &ip);
2475 if (code != 0) {
2476 ip = NULL;
2477 }
2478 DEBUG(1, ("smb_krb5_kinit_password_cache: "
2479 "KDC returned self principal[%s] while impersonating [%s]\n",
2480 sp?sp:"<no memory>",
2481 ip?ip:"<no memory>"));
2482
2483 SAFE_FREE(sp);
2484 SAFE_FREE(ip);
2485
2486 krb5_free_principal(ctx, whitelist_principal);
2487 krb5_free_principal(ctx, blacklist_principal);
2488 krb5_free_cred_contents(ctx, &store_creds);
2489 return KRB5_FWD_BAD_PRINCIPAL;
2490 }
2491 if (blacklist_principal) {
2492 krb5_free_principal(ctx, blacklist_principal);
2493 }
2494
2495 if (whitelist_principal &&
2496 !krb5_principal_compare(ctx, store_creds.client, whitelist_principal)) {
2497 char *sp = NULL;
2498 char *ep = NULL;
2499
2500 code = krb5_unparse_name(ctx, store_creds.client, &sp);
2501 if (code != 0) {
2502 sp = NULL;
2503 }
2504 code = krb5_unparse_name(ctx, whitelist_principal, &ep);
2505 if (code != 0) {
2506 ep = NULL;
2507 }
2508 DEBUG(1, ("smb_krb5_kinit_password_cache: "
2509 "KDC returned wrong principal[%s] we expected [%s]\n",
2510 sp?sp:"<no memory>",
2511 ep?ep:"<no memory>"));
2512
2513 SAFE_FREE(sp);
2514 SAFE_FREE(ep);
2515
2516 krb5_free_principal(ctx, whitelist_principal);
2517 krb5_free_cred_contents(ctx, &store_creds);
2518 return KRB5_FWD_BAD_PRINCIPAL;
2519 }
2520 if (whitelist_principal) {
2521 krb5_free_principal(ctx, whitelist_principal);
2522 }
2523
2524 code = krb5_cc_initialize(ctx, store_cc, store_principal);
2525 if (code != 0) {
2526 krb5_free_cred_contents(ctx, &store_creds);
2527 return code;
2528 }
2529
2530 code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
2531 if (code != 0) {
2532 krb5_free_cred_contents(ctx, &store_creds);
2533 return code;
2534 }
2535
2536 client_realm = krb5_principal_get_realm(ctx, store_creds.client);
2537 if (client_realm != NULL) {
2538 /*
2539 * Because the CANON flag doesn't have any impact
2540 * on the impersonate_principal => store_creds.client
2541 * realm mapping. We need to store the credentials twice,
2542 * once with the returned realm and once with the
2543 * realm of impersonate_principal.
2544 */
2545 code = krb5_principal_set_realm(ctx, store_creds.server,
2546 client_realm);
2547 if (code != 0) {
2548 krb5_free_cred_contents(ctx, &store_creds);
2549 return code;
2550 }
2551
2552 code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
2553 if (code != 0) {
2554 krb5_free_cred_contents(ctx, &store_creds);
2555 return code;
2556 }
2557 }
2558
2559 if (expire_time) {
2560 *expire_time = (time_t) store_creds.times.endtime;
2561 }
2562
2563 if (kdc_time) {
2564 *kdc_time = (time_t) store_creds.times.starttime;
2565 }
2566
2567 krb5_free_cred_contents(ctx, &store_creds);
2568
2569 return 0;
2570 }
2571 #endif
2572
2573 #if !defined(HAVE_KRB5_MAKE_PRINCIPAL) && defined(HAVE_KRB5_BUILD_PRINCIPAL_ALLOC_VA)
2574 /**
2575 * @brief Create a principal name using a variable argument list.
2576 *
2577 * @param[in] context The library context.
2578 *
2579 * @param[inout] principal A pointer to the principal structure.
2580 *
2581 * @param[in] _realm The realm to use. If NULL then the function will
2582 * get the default realm name.
2583 *
2584 * @param[in] ... A list of 'char *' components, ending with NULL.
2585 *
2586 * Use krb5_free_principal() to free the principal when it is no longer needed.
2587 *
2588 * @return 0 on success, a Kerberos error code otherwise.
2589 */
smb_krb5_make_principal(krb5_context context,krb5_principal * principal,const char * _realm,...)2590 krb5_error_code smb_krb5_make_principal(krb5_context context,
2591 krb5_principal *principal,
2592 const char *_realm, ...)
2593 {
2594 krb5_error_code code;
2595 bool free_realm;
2596 char *realm;
2597 va_list ap;
2598
2599 if (_realm) {
2600 realm = discard_const_p(char, _realm);
2601 free_realm = false;
2602 } else {
2603 code = krb5_get_default_realm(context, &realm);
2604 if (code) {
2605 return code;
2606 }
2607 free_realm = true;
2608 }
2609
2610 va_start(ap, _realm);
2611 code = krb5_build_principal_alloc_va(context, principal,
2612 strlen(realm), realm,
2613 ap);
2614 va_end(ap);
2615
2616 if (free_realm) {
2617 krb5_free_default_realm(context, realm);
2618 }
2619
2620 return code;
2621 }
2622 #endif
2623
2624 #if !defined(HAVE_KRB5_CC_GET_LIFETIME) && defined(HAVE_KRB5_CC_RETRIEVE_CRED)
2625 /**
2626 * @brief Get the lifetime of the initial ticket in the cache.
2627 *
2628 * @param[in] context The kerberos context.
2629 *
2630 * @param[in] id The credential cache to get the ticket lifetime.
2631 *
2632 * @param[out] t A pointer to a time value to store the lifetime.
2633 *
2634 * @return 0 on success, a krb5_error_code on error.
2635 */
smb_krb5_cc_get_lifetime(krb5_context context,krb5_ccache id,time_t * t)2636 krb5_error_code smb_krb5_cc_get_lifetime(krb5_context context,
2637 krb5_ccache id,
2638 time_t *t)
2639 {
2640 krb5_cc_cursor cursor;
2641 krb5_error_code kerr;
2642 krb5_creds cred;
2643 krb5_timestamp now;
2644
2645 *t = 0;
2646
2647 kerr = krb5_timeofday(context, &now);
2648 if (kerr) {
2649 return kerr;
2650 }
2651
2652 kerr = krb5_cc_start_seq_get(context, id, &cursor);
2653 if (kerr) {
2654 return kerr;
2655 }
2656
2657 while ((kerr = krb5_cc_next_cred(context, id, &cursor, &cred)) == 0) {
2658 #ifndef HAVE_FLAGS_IN_KRB5_CREDS
2659 if (cred.ticket_flags & TKT_FLG_INITIAL) {
2660 #else
2661 if (cred.flags.b.initial) {
2662 #endif
2663 if (now < cred.times.endtime) {
2664 *t = (time_t) (cred.times.endtime - now);
2665 }
2666 krb5_free_cred_contents(context, &cred);
2667 break;
2668 }
2669 krb5_free_cred_contents(context, &cred);
2670 }
2671
2672 krb5_cc_end_seq_get(context, id, &cursor);
2673
2674 return kerr;
2675 }
2676 #endif /* HAVE_KRB5_CC_GET_LIFETIME */
2677
2678 #if !defined(HAVE_KRB5_FREE_CHECKSUM_CONTENTS) && defined(HAVE_FREE_CHECKSUM)
2679 void smb_krb5_free_checksum_contents(krb5_context ctx, krb5_checksum *cksum)
2680 {
2681 free_Checksum(cksum);
2682 }
2683 #endif
2684
2685 /**
2686 * @brief Compute a checksum operating on a keyblock.
2687 *
2688 * This function computes a checksum over a PAC using the keyblock for a keyed
2689 * checksum.
2690 *
2691 * @param[in] mem_ctx A talloc context to alocate the signature on.
2692 *
2693 * @param[in] pac_data The PAC as input.
2694 *
2695 * @param[in] context The library context.
2696 *
2697 * @param[in] keyblock Encryption key for a keyed checksum.
2698 *
2699 * @param[out] sig_type The checksum type
2700 *
2701 * @param[out] sig_blob The talloc'ed checksum
2702 *
2703 * The caller must free the sig_blob with talloc_free() when it is not needed
2704 * anymore.
2705 *
2706 * @return 0 on success, a Kerberos error code otherwise.
2707 */
2708 krb5_error_code smb_krb5_make_pac_checksum(TALLOC_CTX *mem_ctx,
2709 DATA_BLOB *pac_data,
2710 krb5_context context,
2711 const krb5_keyblock *keyblock,
2712 uint32_t *sig_type,
2713 DATA_BLOB *sig_blob)
2714 {
2715 krb5_error_code ret;
2716 krb5_checksum cksum;
2717 #if defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CREATE_CHECKSUM)
2718 krb5_crypto crypto;
2719
2720
2721 ret = krb5_crypto_init(context,
2722 keyblock,
2723 0,
2724 &crypto);
2725 if (ret) {
2726 DEBUG(0,("krb5_crypto_init() failed: %s\n",
2727 smb_get_krb5_error_message(context, ret, mem_ctx)));
2728 return ret;
2729 }
2730 ret = krb5_create_checksum(context,
2731 crypto,
2732 KRB5_KU_OTHER_CKSUM,
2733 0,
2734 pac_data->data,
2735 pac_data->length,
2736 &cksum);
2737 if (ret) {
2738 DEBUG(2, ("PAC Verification failed: %s\n",
2739 smb_get_krb5_error_message(context, ret, mem_ctx)));
2740 }
2741
2742 krb5_crypto_destroy(context, crypto);
2743
2744 if (ret) {
2745 return ret;
2746 }
2747
2748 *sig_type = cksum.cksumtype;
2749 *sig_blob = data_blob_talloc(mem_ctx,
2750 cksum.checksum.data,
2751 cksum.checksum.length);
2752 #elif defined(HAVE_KRB5_C_MAKE_CHECKSUM)
2753 krb5_data input;
2754
2755 input.data = (char *)pac_data->data;
2756 input.length = pac_data->length;
2757
2758 ret = krb5_c_make_checksum(context,
2759 0,
2760 keyblock,
2761 KRB5_KEYUSAGE_APP_DATA_CKSUM,
2762 &input,
2763 &cksum);
2764 if (ret) {
2765 DEBUG(2, ("PAC Verification failed: %s\n",
2766 smb_get_krb5_error_message(context, ret, mem_ctx)));
2767 return ret;
2768 }
2769
2770 *sig_type = cksum.checksum_type;
2771 *sig_blob = data_blob_talloc(mem_ctx,
2772 cksum.contents,
2773 cksum.length);
2774
2775 #else
2776 #error krb5_create_checksum or krb5_c_make_checksum not available
2777 #endif /* HAVE_KRB5_C_MAKE_CHECKSUM */
2778 smb_krb5_free_checksum_contents(context, &cksum);
2779
2780 return 0;
2781 }
2782
2783
2784 /**
2785 * @brief Get realm of a principal
2786 *
2787 * @param[in] mem_ctx The talloc ctx to put the result on
2788 *
2789 * @param[in] context The library context
2790 *
2791 * @param[in] principal The principal to get the realm from.
2792 *
2793 * @return A talloced string with the realm or NULL if an error occurred.
2794 */
2795 char *smb_krb5_principal_get_realm(TALLOC_CTX *mem_ctx,
2796 krb5_context context,
2797 krb5_const_principal principal)
2798 {
2799 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2800 return talloc_strdup(mem_ctx,
2801 krb5_principal_get_realm(context, principal));
2802 #elif defined(krb5_princ_realm) /* MIT */
2803 const krb5_data *realm;
2804 realm = krb5_princ_realm(context, principal);
2805 return talloc_strndup(mem_ctx, realm->data, realm->length);
2806 #else
2807 #error UNKNOWN_GET_PRINC_REALM_FUNCTIONS
2808 #endif
2809 }
2810
2811 /**
2812 * @brief Get realm of a principal
2813 *
2814 * @param[in] context The library context
2815 *
2816 * @param[in] principal The principal to set the realm
2817 *
2818 * @param[in] realm The realm as a string to set.
2819 *
2820 * @retur 0 on success, a Kerberos error code otherwise.
2821 */
2822 krb5_error_code smb_krb5_principal_set_realm(krb5_context context,
2823 krb5_principal principal,
2824 const char *realm)
2825 {
2826 #ifdef HAVE_KRB5_PRINCIPAL_SET_REALM /* Heimdal */
2827 return krb5_principal_set_realm(context, principal, realm);
2828 #elif defined(krb5_princ_realm) && defined(krb5_princ_set_realm) /* MIT */
2829 krb5_error_code ret;
2830 krb5_data data;
2831 krb5_data *old_data;
2832
2833 old_data = krb5_princ_realm(context, principal);
2834
2835 ret = smb_krb5_copy_data_contents(&data,
2836 realm,
2837 strlen(realm));
2838 if (ret) {
2839 return ret;
2840 }
2841
2842 /* free realm before setting */
2843 free(old_data->data);
2844
2845 krb5_princ_set_realm(context, principal, &data);
2846
2847 return ret;
2848 #else
2849 #error UNKNOWN_PRINC_SET_REALM_FUNCTION
2850 #endif
2851 }
2852
2853
2854 /**
2855 * @brief Get the realm from the service hostname.
2856 *
2857 * This function will look for a domain realm mapping in the [domain_realm]
2858 * section of the krb5.conf first and fallback to extract the realm from
2859 * the provided service hostname. As a last resort it will return the
2860 * provided client_realm.
2861 *
2862 * @param[in] mem_ctx The talloc context
2863 *
2864 * @param[in] hostname The service hostname
2865 *
2866 * @param[in] client_realm If we can not find a mapping, fall back to
2867 * this realm.
2868 *
2869 * @return The realm to use for the service hostname, NULL if a fatal error
2870 * occured.
2871 */
2872 char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
2873 const char *hostname,
2874 const char *client_realm)
2875 {
2876 #if defined(HAVE_KRB5_REALM_TYPE)
2877 /* Heimdal. */
2878 krb5_realm *realm_list = NULL;
2879 #else
2880 /* MIT */
2881 char **realm_list = NULL;
2882 #endif
2883 char *realm = NULL;
2884 krb5_error_code kerr;
2885 krb5_context ctx = NULL;
2886
2887 kerr = smb_krb5_init_context_common(&ctx);
2888 if (kerr) {
2889 DBG_ERR("kerberos init context failed (%s)\n",
2890 error_message(kerr));
2891 return NULL;
2892 }
2893
2894 kerr = krb5_get_host_realm(ctx, hostname, &realm_list);
2895 if (kerr == KRB5_ERR_HOST_REALM_UNKNOWN) {
2896 realm_list = NULL;
2897 kerr = 0;
2898 }
2899 if (kerr != 0) {
2900 DEBUG(3,("kerberos_get_realm_from_hostname %s: "
2901 "failed %s\n",
2902 hostname ? hostname : "(NULL)",
2903 error_message(kerr) ));
2904 goto out;
2905 }
2906
2907 if (realm_list != NULL &&
2908 realm_list[0] != NULL &&
2909 realm_list[0][0] != '\0') {
2910 realm = talloc_strdup(mem_ctx, realm_list[0]);
2911 if (realm == NULL) {
2912 goto out;
2913 }
2914 } else {
2915 const char *p = NULL;
2916
2917 /*
2918 * "dc6.samba2003.example.com"
2919 * returns a realm of "SAMBA2003.EXAMPLE.COM"
2920 *
2921 * "dc6." returns realm as NULL
2922 */
2923 p = strchr_m(hostname, '.');
2924 if (p != NULL && p[1] != '\0') {
2925 realm = talloc_strdup_upper(mem_ctx, p + 1);
2926 if (realm == NULL) {
2927 goto out;
2928 }
2929 }
2930 }
2931
2932 if (realm == NULL) {
2933 realm = talloc_strdup(mem_ctx, client_realm);
2934 }
2935
2936 out:
2937
2938 if (ctx) {
2939 if (realm_list) {
2940 krb5_free_host_realm(ctx, realm_list);
2941 realm_list = NULL;
2942 }
2943 krb5_free_context(ctx);
2944 ctx = NULL;
2945 }
2946 return realm;
2947 }
2948
2949 /**
2950 * @brief Get an error string from a Kerberos error code.
2951 *
2952 * @param[in] context The library context.
2953 *
2954 * @param[in] code The Kerberos error code.
2955 *
2956 * @param[in] mem_ctx The talloc context to allocate the error string on.
2957 *
2958 * @return A talloc'ed error string or NULL if an error occurred.
2959 *
2960 * The caller must free the returned error string with talloc_free() if not
2961 * needed anymore
2962 */
2963 char *smb_get_krb5_error_message(krb5_context context,
2964 krb5_error_code code,
2965 TALLOC_CTX *mem_ctx)
2966 {
2967 char *ret;
2968
2969 #if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
2970 const char *context_error = krb5_get_error_message(context, code);
2971 if (context_error) {
2972 ret = talloc_asprintf(mem_ctx, "%s: %s",
2973 error_message(code), context_error);
2974 krb5_free_error_message(context, context_error);
2975 return ret;
2976 }
2977 #endif
2978 ret = talloc_strdup(mem_ctx, error_message(code));
2979 return ret;
2980 }
2981
2982 /**
2983 * @brief Return the type of a krb5_principal
2984 *
2985 * @param[in] context The library context.
2986 *
2987 * @param[in] principal The principal to get the type from.
2988 *
2989 * @return The integer type of the principal.
2990 */
2991 int smb_krb5_principal_get_type(krb5_context context,
2992 krb5_const_principal principal)
2993 {
2994 #ifdef HAVE_KRB5_PRINCIPAL_GET_TYPE /* Heimdal */
2995 return krb5_principal_get_type(context, principal);
2996 #elif defined(krb5_princ_type) /* MIT */
2997 return krb5_princ_type(context, principal);
2998 #else
2999 #error UNKNOWN_PRINC_GET_TYPE_FUNCTION
3000 #endif
3001 }
3002
3003 /**
3004 * @brief Set the type of a principal
3005 *
3006 * @param[in] context The library context
3007 *
3008 * @param[inout] principal The principal to set the type for.
3009 *
3010 * @param[in] type The principal type to set.
3011 */
3012 void smb_krb5_principal_set_type(krb5_context context,
3013 krb5_principal principal,
3014 int type)
3015 {
3016 #ifdef HAVE_KRB5_PRINCIPAL_SET_TYPE /* Heimdal */
3017 krb5_principal_set_type(context, principal, type);
3018 #elif defined(krb5_princ_type) /* MIT */
3019 krb5_princ_type(context, principal) = type;
3020 #else
3021 #error UNKNOWN_PRINC_SET_TYPE_FUNCTION
3022 #endif
3023 }
3024
3025 #if !defined(HAVE_KRB5_WARNX)
3026 /**
3027 * @brief Log a Kerberos message
3028 *
3029 * It sends the message to com_err.
3030 *
3031 * @param[in] context The library context
3032 *
3033 * @param[in] fmt The message format
3034 *
3035 * @param[in] ... The message arguments
3036 *
3037 * @return 0 on success.
3038 */
3039 krb5_error_code krb5_warnx(krb5_context context, const char *fmt, ...)
3040 {
3041 va_list args;
3042
3043 va_start(args, fmt);
3044 com_err_va("samba-kdc", errno, fmt, args);
3045 va_end(args);
3046
3047 return 0;
3048 }
3049 #endif
3050
3051 /**
3052 * @brief Copy a credential cache.
3053 *
3054 * @param[in] context The library context.
3055 *
3056 * @param[in] incc Credential cache to be copied.
3057 *
3058 * @param[inout] outcc Copy of credential cache to be filled in.
3059 *
3060 * @return 0 on success, a Kerberos error code otherwise.
3061 */
3062 krb5_error_code smb_krb5_cc_copy_creds(krb5_context context,
3063 krb5_ccache incc, krb5_ccache outcc)
3064 {
3065 #ifdef HAVE_KRB5_CC_COPY_CACHE /* Heimdal */
3066 return krb5_cc_copy_cache(context, incc, outcc);
3067 #elif defined(HAVE_KRB5_CC_COPY_CREDS)
3068 krb5_error_code ret;
3069 krb5_principal princ = NULL;
3070
3071 ret = krb5_cc_get_principal(context, incc, &princ);
3072 if (ret != 0) {
3073 return ret;
3074 }
3075 ret = krb5_cc_initialize(context, outcc, princ);
3076 krb5_free_principal(context, princ);
3077 if (ret != 0) {
3078 return ret;
3079 }
3080 return krb5_cc_copy_creds(context, incc, outcc);
3081 #else
3082 #error UNKNOWN_KRB5_CC_COPY_CACHE_OR_CREDS_FUNCTION
3083 #endif
3084 }
3085
3086 /**********************************************************
3087 * ADS KRB5 CALLS
3088 **********************************************************/
3089
3090 static bool ads_cleanup_expired_creds(krb5_context context,
3091 krb5_ccache ccache,
3092 krb5_creds *credsp)
3093 {
3094 krb5_error_code retval;
3095 const char *cc_type = krb5_cc_get_type(context, ccache);
3096
3097 DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
3098 cc_type, krb5_cc_get_name(context, ccache),
3099 http_timestring(talloc_tos(), credsp->times.endtime)));
3100
3101 /* we will probably need new tickets if the current ones
3102 will expire within 10 seconds.
3103 */
3104 if (credsp->times.endtime >= (time(NULL) + 10))
3105 return false;
3106
3107 /* heimdal won't remove creds from a file ccache, and
3108 perhaps we shouldn't anyway, since internally we
3109 use memory ccaches, and a FILE one probably means that
3110 we're using creds obtained outside of our exectuable
3111 */
3112 if (strequal(cc_type, "FILE")) {
3113 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
3114 return false;
3115 }
3116
3117 retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
3118 if (retval) {
3119 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
3120 error_message(retval)));
3121 /* If we have an error in this, we want to display it,
3122 but continue as though we deleted it */
3123 }
3124 return true;
3125 }
3126
3127 /* Allocate and setup the auth context into the state we need. */
3128
3129 static krb5_error_code ads_setup_auth_context(krb5_context context,
3130 krb5_auth_context *auth_context)
3131 {
3132 krb5_error_code retval;
3133
3134 retval = krb5_auth_con_init(context, auth_context );
3135 if (retval) {
3136 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
3137 error_message(retval)));
3138 return retval;
3139 }
3140
3141 /* Ensure this is an addressless ticket. */
3142 retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
3143 if (retval) {
3144 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
3145 error_message(retval)));
3146 }
3147
3148 return retval;
3149 }
3150
3151 #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)
3152 static krb5_error_code ads_create_gss_checksum(krb5_data *in_data, /* [inout] */
3153 uint32_t gss_flags)
3154 {
3155 unsigned int orig_length = in_data->length;
3156 unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
3157 char *gss_cksum = NULL;
3158
3159 if (orig_length) {
3160 /* Extra length field for delgated ticket. */
3161 base_cksum_size += 4;
3162 }
3163
3164 if ((unsigned int)base_cksum_size + orig_length <
3165 (unsigned int)base_cksum_size) {
3166 return EINVAL;
3167 }
3168
3169 gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
3170 if (gss_cksum == NULL) {
3171 return ENOMEM;
3172 }
3173
3174 memset(gss_cksum, '\0', base_cksum_size + orig_length);
3175 SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
3176
3177 /*
3178 * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
3179 * This matches the behavior of heimdal and mit.
3180 *
3181 * And it is needed to work against some closed source
3182 * SMB servers.
3183 *
3184 * See bug #7883
3185 */
3186 memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
3187
3188 SIVAL(gss_cksum, 20, gss_flags);
3189
3190 if (orig_length && in_data->data != NULL) {
3191 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
3192 SSVAL(gss_cksum, 26, orig_length);
3193 /* Copy the kerberos KRB_CRED data */
3194 memcpy(gss_cksum + 28, in_data->data, orig_length);
3195 free(in_data->data);
3196 in_data->data = NULL;
3197 in_data->length = 0;
3198 }
3199 in_data->data = gss_cksum;
3200 in_data->length = base_cksum_size + orig_length;
3201 return 0;
3202 }
3203 #endif
3204
3205 /*
3206 * We can't use krb5_mk_req because w2k wants the service to be in a particular
3207 * format.
3208 */
3209 static krb5_error_code ads_krb5_mk_req(krb5_context context,
3210 krb5_auth_context *auth_context,
3211 const krb5_flags ap_req_options,
3212 const char *principal,
3213 krb5_ccache ccache,
3214 krb5_data *outbuf,
3215 time_t *expire_time,
3216 const char *impersonate_princ_s)
3217 {
3218 krb5_error_code retval;
3219 krb5_principal server;
3220 krb5_principal impersonate_princ = NULL;
3221 krb5_creds *credsp;
3222 krb5_creds creds;
3223 krb5_data in_data;
3224 bool creds_ready = false;
3225 int i = 0, maxtries = 3;
3226 bool ok;
3227
3228 ZERO_STRUCT(in_data);
3229
3230 retval = smb_krb5_parse_name(context, principal, &server);
3231 if (retval != 0) {
3232 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
3233 return retval;
3234 }
3235
3236 if (impersonate_princ_s) {
3237 retval = smb_krb5_parse_name(context, impersonate_princ_s,
3238 &impersonate_princ);
3239 if (retval) {
3240 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
3241 goto cleanup_princ;
3242 }
3243 }
3244
3245 /* obtain ticket & session key */
3246 ZERO_STRUCT(creds);
3247 if ((retval = krb5_copy_principal(context, server, &creds.server))) {
3248 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
3249 error_message(retval)));
3250 goto cleanup_princ;
3251 }
3252
3253 retval = krb5_cc_get_principal(context, ccache, &creds.client);
3254 if (retval != 0) {
3255 /* This can commonly fail on smbd startup with no ticket in the cache.
3256 * Report at higher level than 1. */
3257 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
3258 error_message(retval)));
3259 goto cleanup_creds;
3260 }
3261
3262 while (!creds_ready && (i < maxtries)) {
3263
3264 retval = smb_krb5_get_credentials(context,
3265 ccache,
3266 creds.client,
3267 creds.server,
3268 impersonate_princ,
3269 &credsp);
3270 if (retval != 0) {
3271 DBG_WARNING("smb_krb5_get_credentials failed for %s "
3272 "(%s)\n",
3273 principal,
3274 error_message(retval));
3275 goto cleanup_creds;
3276 }
3277
3278 /* cope with ticket being in the future due to clock skew */
3279 if ((unsigned)credsp->times.starttime > time(NULL)) {
3280 time_t t = time(NULL);
3281 int time_offset =(int)((unsigned)credsp->times.starttime-t);
3282 DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
3283 krb5_set_real_time(context, t + time_offset + 1, 0);
3284 }
3285
3286 ok = ads_cleanup_expired_creds(context, ccache, credsp);
3287 if (!ok) {
3288 creds_ready = true;
3289 }
3290
3291 i++;
3292 }
3293
3294 DBG_DEBUG("Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
3295 principal,
3296 krb5_cc_get_type(context, ccache),
3297 krb5_cc_get_name(context, ccache),
3298 http_timestring(talloc_tos(),
3299 (unsigned)credsp->times.endtime),
3300 (unsigned)credsp->times.endtime);
3301
3302 if (expire_time) {
3303 *expire_time = (time_t)credsp->times.endtime;
3304 }
3305
3306 /* Allocate the auth_context. */
3307 retval = ads_setup_auth_context(context, auth_context);
3308 if (retval != 0) {
3309 DBG_WARNING("ads_setup_auth_context failed (%s)\n",
3310 error_message(retval));
3311 goto cleanup_creds;
3312 }
3313
3314 #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)
3315 {
3316 uint32_t gss_flags = 0;
3317
3318 if (credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE) {
3319 /*
3320 * Fetch a forwarded TGT from the KDC so that we can
3321 * hand off a 2nd ticket as part of the kerberos
3322 * exchange.
3323 */
3324
3325 DBG_INFO("Server marked as OK to delegate to, building "
3326 "forwardable TGT\n");
3327
3328 retval = krb5_auth_con_setuseruserkey(context,
3329 *auth_context,
3330 &credsp->keyblock );
3331 if (retval != 0) {
3332 DBG_WARNING("krb5_auth_con_setuseruserkey "
3333 "failed (%s)\n",
3334 error_message(retval));
3335 goto cleanup_creds;
3336 }
3337
3338 /* Must use a subkey for forwarded tickets. */
3339 retval = krb5_auth_con_setflags(context,
3340 *auth_context,
3341 KRB5_AUTH_CONTEXT_USE_SUBKEY);
3342 if (retval != 0) {
3343 DBG_WARNING("krb5_auth_con_setflags failed (%s)\n",
3344 error_message(retval));
3345 goto cleanup_creds;
3346 }
3347
3348 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
3349 *auth_context, /* Authentication context [in] */
3350 discard_const_p(char, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
3351 credsp->client, /* Client principal for the tgt [in] */
3352 credsp->server, /* Server principal for the tgt [in] */
3353 ccache, /* Credential cache to use for storage [in] */
3354 1, /* Turn on for "Forwardable ticket" [in] */
3355 &in_data ); /* Resulting response [out] */
3356
3357 if (retval) {
3358 DBG_INFO("krb5_fwd_tgt_creds failed (%s)\n",
3359 error_message(retval));
3360
3361 /*
3362 * This is not fatal. Delete the *auth_context and continue
3363 * with krb5_mk_req_extended to get a non-forwardable ticket.
3364 */
3365
3366 if (in_data.data) {
3367 free( in_data.data );
3368 in_data.data = NULL;
3369 in_data.length = 0;
3370 }
3371 krb5_auth_con_free(context, *auth_context);
3372 *auth_context = NULL;
3373 retval = ads_setup_auth_context(context, auth_context);
3374 if (retval != 0) {
3375 DBG_WARNING("ads_setup_auth_context failed (%s)\n",
3376 error_message(retval));
3377 goto cleanup_creds;
3378 }
3379 } else {
3380 /* We got a delegated ticket. */
3381 gss_flags |= GSS_C_DELEG_FLAG;
3382 }
3383 }
3384
3385 /* Frees and reallocates in_data into a GSS checksum blob. */
3386 retval = ads_create_gss_checksum(&in_data, gss_flags);
3387 if (retval != 0) {
3388 goto cleanup_data;
3389 }
3390
3391 /* We always want GSS-checksum types. */
3392 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
3393 if (retval != 0) {
3394 DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
3395 error_message(retval)));
3396 goto cleanup_data;
3397 }
3398 }
3399 #endif
3400
3401 retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
3402 &in_data, credsp, outbuf);
3403 if (retval != 0) {
3404 DBG_WARNING("krb5_mk_req_extended failed (%s)\n",
3405 error_message(retval));
3406 }
3407
3408 #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)
3409 cleanup_data:
3410 #endif
3411
3412 if (in_data.data) {
3413 free( in_data.data );
3414 in_data.length = 0;
3415 }
3416
3417 krb5_free_creds(context, credsp);
3418
3419 cleanup_creds:
3420 krb5_free_cred_contents(context, &creds);
3421
3422 cleanup_princ:
3423 krb5_free_principal(context, server);
3424 if (impersonate_princ) {
3425 krb5_free_principal(context, impersonate_princ);
3426 }
3427
3428 return retval;
3429 }
3430
3431 /*
3432 get a kerberos5 ticket for the given service
3433 */
3434 int ads_krb5_cli_get_ticket(TALLOC_CTX *mem_ctx,
3435 const char *principal,
3436 time_t time_offset,
3437 DATA_BLOB *ticket,
3438 DATA_BLOB *session_key_krb5,
3439 uint32_t extra_ap_opts, const char *ccname,
3440 time_t *tgs_expire,
3441 const char *impersonate_princ_s)
3442 {
3443 krb5_error_code retval;
3444 krb5_data packet;
3445 krb5_context context = NULL;
3446 krb5_ccache ccdef = NULL;
3447 krb5_auth_context auth_context = NULL;
3448 krb5_enctype enc_types[] = {
3449 #ifdef HAVE_ENCTYPE_AES256_CTS_HMAC_SHA1_96
3450 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
3451 #endif
3452 #ifdef HAVE_ENCTYPE_AES128_CTS_HMAC_SHA1_96
3453 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
3454 #endif
3455 ENCTYPE_ARCFOUR_HMAC,
3456 ENCTYPE_DES_CBC_MD5,
3457 ENCTYPE_DES_CBC_CRC,
3458 ENCTYPE_NULL};
3459 bool ok;
3460
3461 retval = smb_krb5_init_context_common(&context);
3462 if (retval != 0) {
3463 DBG_ERR("kerberos init context failed (%s)\n",
3464 error_message(retval));
3465 goto failed;
3466 }
3467
3468 if (time_offset != 0) {
3469 krb5_set_real_time(context, time(NULL) + time_offset, 0);
3470 }
3471
3472 retval = krb5_cc_resolve(context,
3473 ccname ? ccname : krb5_cc_default_name(context),
3474 &ccdef);
3475 if (retval != 0) {
3476 DBG_WARNING("krb5_cc_default failed (%s)\n",
3477 error_message(retval));
3478 goto failed;
3479 }
3480
3481 retval = krb5_set_default_tgs_ktypes(context, enc_types);
3482 if (retval != 0) {
3483 DBG_WARNING("krb5_set_default_tgs_ktypes failed (%s)\n",
3484 error_message(retval));
3485 goto failed;
3486 }
3487
3488 retval = ads_krb5_mk_req(context,
3489 &auth_context,
3490 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
3491 principal,
3492 ccdef,
3493 &packet,
3494 tgs_expire,
3495 impersonate_princ_s);
3496 if (retval != 0) {
3497 goto failed;
3498 }
3499
3500 ok = smb_krb5_get_smb_session_key(mem_ctx,
3501 context,
3502 auth_context,
3503 session_key_krb5,
3504 false);
3505 if (!ok) {
3506 retval = ENOMEM;
3507 goto failed;
3508 }
3509
3510 *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
3511
3512 smb_krb5_free_data_contents(context, &packet);
3513
3514 failed:
3515
3516 if (context) {
3517 if (ccdef) {
3518 krb5_cc_close(context, ccdef);
3519 }
3520 if (auth_context) {
3521 krb5_auth_con_free(context, auth_context);
3522 }
3523 krb5_free_context(context);
3524 }
3525
3526 return retval;
3527 }
3528
3529 #ifndef SAMBA4_USES_HEIMDAL /* MITKRB5 tracing callback */
3530 static void smb_krb5_trace_cb(krb5_context ctx,
3531 const krb5_trace_info *info,
3532 void *data)
3533 {
3534 if (info != NULL) {
3535 DBGC_DEBUG(DBGC_KERBEROS, "%s", info->message);
3536 }
3537 }
3538 #endif
3539
3540 krb5_error_code smb_krb5_init_context_common(krb5_context *_krb5_context)
3541 {
3542 krb5_error_code ret;
3543 krb5_context krb5_ctx;
3544
3545 initialize_krb5_error_table();
3546
3547 ret = krb5_init_context(&krb5_ctx);
3548 if (ret) {
3549 DBG_ERR("Krb5 context initialization failed (%s)\n",
3550 error_message(ret));
3551 return ret;
3552 }
3553
3554 /* The MIT Kerberos build relies on using the system krb5.conf file.
3555 * If you really want to use another file please set KRB5_CONFIG
3556 * accordingly. */
3557 #ifndef SAMBA4_USES_HEIMDAL
3558 ret = krb5_set_trace_callback(krb5_ctx, smb_krb5_trace_cb, NULL);
3559 if (ret) {
3560 DBG_ERR("Failed to set MIT kerberos trace callback! (%s)\n",
3561 error_message(ret));
3562 }
3563 #endif
3564
3565 #ifdef SAMBA4_USES_HEIMDAL
3566 /* Set options in kerberos */
3567 krb5_set_dns_canonicalize_hostname(krb5_ctx, false);
3568 #endif
3569
3570 *_krb5_context = krb5_ctx;
3571 return 0;
3572 }
3573
3574 #else /* HAVE_KRB5 */
3575 /* This saves a few linking headaches */
3576 int ads_krb5_cli_get_ticket(TALLOC_CTX *mem_ctx,
3577 const char *principal,
3578 time_t time_offset,
3579 DATA_BLOB *ticket,
3580 DATA_BLOB *session_key_krb5,
3581 uint32_t extra_ap_opts, const char *ccname,
3582 time_t *tgs_expire,
3583 const char *impersonate_princ_s)
3584 {
3585 DEBUG(0,("NO KERBEROS SUPPORT\n"));
3586 return 1;
3587 }
3588
3589 #endif /* HAVE_KRB5 */
3590