krb5_wrap: handle KRB5_ERR_HOST_REALM_UNKNOWN in smb_krb5_get_realm_from_hostname()
[samba.git] / lib / krb5_wrap / krb5_samba.c
1 /*
2    Unix SMB/CIFS implementation.
3    simple kerberos5 routines for active directory
4    Copyright (C) Andrew Tridgell 2001
5    Copyright (C) Luke Howard 2002-2003
6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
7    Copyright (C) Guenther Deschner 2005-2009
8
9    This program is free software; you can redistribute it and/or modify
10    it under the terms of the GNU General Public License as published by
11    the Free Software Foundation; either version 3 of the License, or
12    (at your option) any later version.
13
14    This program is distributed in the hope that it will be useful,
15    but WITHOUT ANY WARRANTY; without even the implied warranty of
16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17    GNU General Public License for more details.
18
19    You should have received a copy of the GNU General Public License
20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
21 */
22
23 #include "includes.h"
24 #include "system/filesys.h"
25 #include "krb5_samba.h"
26 #include "lib/crypto/crypto.h"
27
28 #ifdef HAVE_COM_ERR_H
29 #include <com_err.h>
30 #endif /* HAVE_COM_ERR_H */
31
32 #ifndef KRB5_AUTHDATA_WIN2K_PAC
33 #define KRB5_AUTHDATA_WIN2K_PAC 128
34 #endif
35
36 #ifndef KRB5_AUTHDATA_IF_RELEVANT
37 #define KRB5_AUTHDATA_IF_RELEVANT 1
38 #endif
39
40 #ifdef HAVE_KRB5
41
42 #define GSSAPI_CHECKSUM      0x8003             /* Checksum type value for Kerberos */
43 #define GSSAPI_BNDLENGTH     16                 /* Bind Length (rfc-1964 pg.3) */
44 #define GSSAPI_CHECKSUM_SIZE (4+GSSAPI_BNDLENGTH+4) /* Length of bind length,
45                                                         bind field, flags field. */
46 #define GSS_C_DELEG_FLAG 1
47
48 /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
49    but still has the symbol */
50 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
51 krb5_error_code krb5_auth_con_set_req_cksumtype(
52         krb5_context     context,
53         krb5_auth_context      auth_context,
54         krb5_cksumtype     cksumtype);
55 #endif
56
57 #if !defined(SMB_MALLOC)
58 #undef malloc
59 #define SMB_MALLOC(s) malloc((s))
60 #endif
61
62 #ifndef SMB_STRDUP
63 #define SMB_STRDUP(s) strdup(s)
64 #endif
65
66 /**********************************************************
67  * MISSING FUNCTIONS
68  **********************************************************/
69
70 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
71
72 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
73
74 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
75  * to krb5_set_default_tgs_ktypes. See
76  *         http://lists.samba.org/archive/samba-technical/2006-July/048271.html
77  *
78  * If the MIT libraries are not exporting internal symbols, we will end up in
79  * this branch, which is correct. Otherwise we will continue to use the
80  * internal symbol
81  */
82  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
83 {
84     return krb5_set_default_tgs_enctypes(ctx, enc);
85 }
86
87 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
88
89 /* Heimdal */
90  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
91 {
92         return krb5_set_default_in_tkt_etypes(ctx, enc);
93 }
94
95 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
96
97 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
98
99
100 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
101 krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
102                                              krb5_auth_context auth_context,
103                                              krb5_keyblock *keyblock)
104 {
105         return krb5_auth_con_setkey(context, auth_context, keyblock);
106 }
107 #endif
108
109 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
110 void krb5_free_unparsed_name(krb5_context context, char *val)
111 {
112         SAFE_FREE(val);
113 }
114 #endif
115
116 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
117 const krb5_data *krb5_princ_component(krb5_context context,
118                                       krb5_principal principal, int i);
119
120 const krb5_data *krb5_princ_component(krb5_context context,
121                                       krb5_principal principal, int i)
122 {
123         static krb5_data kdata;
124
125         kdata.data = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i));
126         kdata.length = strlen((const char *)kdata.data);
127         return &kdata;
128 }
129 #endif
130
131
132 /**********************************************************
133  * WRAPPING FUNCTIONS
134  **********************************************************/
135
136 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
137 /* HEIMDAL */
138
139 /**
140  * @brief Stores the address of a 'struct sockaddr_storage' a krb5_address
141  *
142  * @param[in]  paddr    A pointer to a 'struct sockaddr_storage to extract the
143  *                      address from.
144  *
145  * @param[out] pkaddr   A Kerberos address to store tha address in.
146  *
147  * @return True on success, false if an error occurred.
148  */
149 bool smb_krb5_sockaddr_to_kaddr(struct sockaddr_storage *paddr,
150                                 krb5_address *pkaddr)
151 {
152         memset(pkaddr, '\0', sizeof(krb5_address));
153 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
154         if (paddr->ss_family == AF_INET6) {
155                 pkaddr->addr_type = KRB5_ADDRESS_INET6;
156                 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
157                 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
158                 return true;
159         }
160 #endif
161         if (paddr->ss_family == AF_INET) {
162                 pkaddr->addr_type = KRB5_ADDRESS_INET;
163                 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
164                 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
165                 return true;
166         }
167         return false;
168 }
169 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
170 /* MIT */
171
172 /**
173  * @brief Stores the address of a 'struct sockaddr_storage' a krb5_address
174  *
175  * @param[in]  paddr    A pointer to a 'struct sockaddr_storage to extract the
176  *                      address from.
177  *
178  * @param[in]  pkaddr A Kerberos address to store tha address in.
179  *
180  * @return True on success, false if an error occurred.
181  */
182 bool smb_krb5_sockaddr_to_kaddr(struct sockaddr_storage *paddr,
183                                 krb5_address *pkaddr)
184 {
185         memset(pkaddr, '\0', sizeof(krb5_address));
186 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
187         if (paddr->ss_family == AF_INET6) {
188                 pkaddr->addrtype = ADDRTYPE_INET6;
189                 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
190                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
191                 return true;
192         }
193 #endif
194         if (paddr->ss_family == AF_INET) {
195                 pkaddr->addrtype = ADDRTYPE_INET;
196                 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
197                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
198                 return true;
199         }
200         return false;
201 }
202 #else
203 #error UNKNOWN_ADDRTYPE
204 #endif
205
206 krb5_error_code smb_krb5_mk_error(krb5_context context,
207                                   krb5_error_code error_code,
208                                   const char *e_text,
209                                   krb5_data *e_data,
210                                   const krb5_principal client,
211                                   const krb5_principal server,
212                                   krb5_data *enc_err)
213 {
214         krb5_error_code code = EINVAL;
215 #ifdef SAMBA4_USES_HEIMDAL
216         code = krb5_mk_error(context,
217                              error_code,
218                              e_text,
219                              e_data,
220                              client,
221                              server,
222                              NULL, /* client_time */
223                              NULL, /* client_usec */
224                              enc_err);
225 #else
226         krb5_principal unspec_server = NULL;
227         krb5_error errpkt;
228
229         errpkt.ctime = 0;
230         errpkt.cusec = 0;
231
232         code = krb5_us_timeofday(context,
233                                  &errpkt.stime,
234                                  &errpkt.susec);
235         if (code != 0) {
236                 return code;
237         }
238
239         errpkt.error = error_code;
240
241         errpkt.text.length = 0;
242         if (e_text != NULL) {
243                 errpkt.text.length = strlen(e_text);
244                 errpkt.text.data = discard_const_p(char, e_text);
245         }
246
247         errpkt.e_data.magic = KV5M_DATA;
248         errpkt.e_data.length = 0;
249         errpkt.e_data.data = NULL;
250         if (e_data != NULL) {
251                 errpkt.e_data = *e_data;
252         }
253
254         errpkt.client = client;
255
256         if (server != NULL) {
257                 errpkt.server = server;
258         } else {
259                 code = smb_krb5_make_principal(context,
260                                                &unspec_server,
261                                                "<unspecified realm>",
262                                                NULL);
263                 if (code != 0) {
264                         return code;
265                 }
266                 errpkt.server = unspec_server;
267         }
268
269         code = krb5_mk_error(context,
270                              &errpkt,
271                              enc_err);
272         krb5_free_principal(context, unspec_server);
273 #endif
274         return code;
275 }
276
277 /**
278 * @brief Create a keyblock based on input parameters
279 *
280 * @param context        The krb5_context
281 * @param host_princ     The krb5_principal to use
282 * @param salt           The optional salt, if omitted, salt is calculated with
283 *                       the provided principal.
284 * @param password       The krb5_data containing the password
285 * @param enctype        The krb5_enctype to use for the keyblock generation
286 * @param key            The returned krb5_keyblock, caller needs to free with
287 *                       krb5_free_keyblock().
288 *
289 * @return krb5_error_code
290 */
291 int smb_krb5_create_key_from_string(krb5_context context,
292                                     krb5_const_principal host_princ,
293                                     krb5_data *salt,
294                                     krb5_data *password,
295                                     krb5_enctype enctype,
296                                     krb5_keyblock *key)
297 {
298         int ret = 0;
299
300         if (host_princ == NULL && salt == NULL) {
301                 return -1;
302         }
303
304         if ((int)enctype == (int)ENCTYPE_ARCFOUR_HMAC) {
305                 TALLOC_CTX *frame = talloc_stackframe();
306                 uint8_t *utf16 = NULL;
307                 size_t utf16_size = 0;
308                 uint8_t nt_hash[16];
309                 bool ok;
310
311                 ok = convert_string_talloc(frame, CH_UNIX, CH_UTF16LE,
312                                            password->data, password->length,
313                                            (void **)&utf16, &utf16_size);
314                 if (!ok) {
315                         if (errno == 0) {
316                                 errno = EINVAL;
317                         }
318                         ret = errno;
319                         TALLOC_FREE(frame);
320                         return ret;
321                 }
322
323                 mdfour(nt_hash, utf16, utf16_size);
324                 memset(utf16, 0, utf16_size);
325                 ret = smb_krb5_keyblock_init_contents(context,
326                                                       ENCTYPE_ARCFOUR_HMAC,
327                                                       nt_hash,
328                                                       sizeof(nt_hash),
329                                                       key);
330                 ZERO_STRUCT(nt_hash);
331                 if (ret != 0) {
332                         TALLOC_FREE(frame);
333                         return ret;
334                 }
335
336                 TALLOC_FREE(frame);
337                 return 0;
338         }
339
340 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_C_STRING_TO_KEY)
341 {/* MIT */
342         krb5_data _salt;
343
344         if (salt == NULL) {
345                 ret = krb5_principal2salt(context, host_princ, &_salt);
346                 if (ret) {
347                         DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
348                         return ret;
349                 }
350         } else {
351                 _salt = *salt;
352         }
353         ret = krb5_c_string_to_key(context, enctype, password, &_salt, key);
354         if (salt == NULL) {
355                 SAFE_FREE(_salt.data);
356         }
357 }
358 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
359 {/* Heimdal */
360         krb5_salt _salt;
361
362         if (salt == NULL) {
363                 ret = krb5_get_pw_salt(context, host_princ, &_salt);
364                 if (ret) {
365                         DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
366                         return ret;
367                 }
368         } else {
369                 _salt.saltvalue = *salt;
370                 _salt.salttype = KRB5_PW_SALT;
371         }
372
373         ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, _salt, key);
374         if (salt == NULL) {
375                 krb5_free_salt(context, _salt);
376         }
377 }
378 #else
379 #error UNKNOWN_CREATE_KEY_FUNCTIONS
380 #endif
381         return ret;
382 }
383
384 /**
385 * @brief Create a salt for a given principal
386 *
387 * @param context        The initialized krb5_context
388 * @param host_princ     The krb5_principal to create the salt for
389 * @param psalt          A pointer to a krb5_data struct
390 *
391 * caller has to free the contents of psalt with smb_krb5_free_data_contents
392 * when function has succeeded
393 *
394 * @return krb5_error_code, returns 0 on success, error code otherwise
395 */
396
397 int smb_krb5_get_pw_salt(krb5_context context,
398                          krb5_const_principal host_princ,
399                          krb5_data *psalt)
400 #if defined(HAVE_KRB5_GET_PW_SALT)
401 /* Heimdal */
402 {
403         int ret;
404         krb5_salt salt;
405
406         ret = krb5_get_pw_salt(context, host_princ, &salt);
407         if (ret) {
408                 return ret;
409         }
410
411         psalt->data = salt.saltvalue.data;
412         psalt->length = salt.saltvalue.length;
413
414         return ret;
415 }
416 #elif defined(HAVE_KRB5_PRINCIPAL2SALT)
417 /* MIT */
418 {
419         return krb5_principal2salt(context, host_princ, psalt);
420 }
421 #else
422 #error UNKNOWN_SALT_FUNCTIONS
423 #endif
424
425 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
426 /**
427  * @brief Get a list of encryption types allowed for session keys
428  *
429  * @param[in]  context  The library context
430  *
431  * @param[in]  enctypes An allocated, zero-terminated list of encryption types
432  *
433  * This function returns an allocated list of encryption types allowed for
434  * session keys.
435  *
436  * Use free() to free the enctypes when it is no longer needed.
437  *
438  * @retval 0 Success; otherwise - Kerberos error codes
439  */
440 krb5_error_code smb_krb5_get_allowed_etypes(krb5_context context,
441                                             krb5_enctype **enctypes)
442 {
443         return krb5_get_permitted_enctypes(context, enctypes);
444 }
445 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
446 krb5_error_code smb_krb5_get_allowed_etypes(krb5_context context,
447                                             krb5_enctype **enctypes)
448 {
449 #ifdef HAVE_KRB5_PDU_NONE_DECL
450         return krb5_get_default_in_tkt_etypes(context, KRB5_PDU_NONE, enctypes);
451 #else
452         return krb5_get_default_in_tkt_etypes(context, enctypes);
453 #endif
454 }
455 #else
456 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
457 #endif
458
459
460 /**
461  * @brief Convert a string principal name to a Kerberos principal.
462  *
463  * @param[in]  context  The library context
464  *
465  * @param[in]  name     The principal as a unix charset string.
466  *
467  * @param[out] principal The newly allocated principal.
468  *
469  * Use krb5_free_principal() to free a principal when it is no longer needed.
470  *
471  * @return 0 on success, a Kerberos error code otherwise.
472  */
473 krb5_error_code smb_krb5_parse_name(krb5_context context,
474                                     const char *name,
475                                     krb5_principal *principal)
476 {
477         krb5_error_code ret;
478         char *utf8_name;
479         size_t converted_size;
480         TALLOC_CTX *frame = talloc_stackframe();
481
482         if (!push_utf8_talloc(frame, &utf8_name, name, &converted_size)) {
483                 talloc_free(frame);
484                 return ENOMEM;
485         }
486
487         ret = krb5_parse_name(context, utf8_name, principal);
488         TALLOC_FREE(frame);
489         return ret;
490 }
491
492 /**
493  * @brief Convert a Kerberos principal structure to a string representation.
494  *
495  * The resulting string representation will be a unix charset name and is
496  * talloc'ed.
497  *
498  * @param[in]  mem_ctx  The talloc context to allocate memory on.
499  *
500  * @param[in]  context  The library context.
501  *
502  * @param[in]  principal The principal.
503  *
504  * @param[out] unix_name A string representation of the princpial name as with
505  *                       unix charset.
506  *
507  * Use talloc_free() to free the string representation if it is no longer
508  * needed.
509  *
510  * @return 0 on success, a Kerberos error code otherwise.
511  */
512 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
513                                       krb5_context context,
514                                       krb5_const_principal principal,
515                                       char **unix_name)
516 {
517         krb5_error_code ret;
518         char *utf8_name;
519         size_t converted_size;
520
521         *unix_name = NULL;
522         ret = krb5_unparse_name(context, principal, &utf8_name);
523         if (ret) {
524                 return ret;
525         }
526
527         if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
528                 krb5_free_unparsed_name(context, utf8_name);
529                 return ENOMEM;
530         }
531         krb5_free_unparsed_name(context, utf8_name);
532         return 0;
533 }
534
535 /**
536  * @brief Free the contents of a krb5_data structure and zero the data field.
537  *
538  * @param[in]  context  The krb5 context
539  *
540  * @param[in]  pdata    The data structure to free contents of
541  *
542  * This function frees the contents, not the structure itself.
543  */
544 void smb_krb5_free_data_contents(krb5_context context, krb5_data *pdata)
545 {
546 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
547         if (pdata->data) {
548                 krb5_free_data_contents(context, pdata);
549         }
550 #elif defined(HAVE_KRB5_DATA_FREE)
551         krb5_data_free(context, pdata);
552 #else
553         SAFE_FREE(pdata->data);
554 #endif
555 }
556
557 /*
558  * @brief copy a buffer into a krb5_data struct
559  *
560  * @param[in] p                 The krb5_data
561  * @param[in] data              The data to copy
562  * @param[in] length            The length of the data to copy
563  * @return krb5_error_code
564  *
565  * Caller has to free krb5_data with smb_krb5_free_data_contents().
566  */
567 krb5_error_code smb_krb5_copy_data_contents(krb5_data *p,
568                                             const void *data,
569                                             size_t len)
570 {
571 #if defined(HAVE_KRB5_DATA_COPY)
572         return krb5_data_copy(p, data, len);
573 #else
574         if (len) {
575                 p->data = malloc(len);
576                 if (p->data == NULL) {
577                         return ENOMEM;
578                 }
579                 memmove(p->data, data, len);
580         } else {
581                 p->data = NULL;
582         }
583         p->length = len;
584         p->magic = KV5M_DATA;
585         return 0;
586 #endif
587 }
588
589 bool smb_krb5_get_smb_session_key(TALLOC_CTX *mem_ctx,
590                                   krb5_context context,
591                                   krb5_auth_context auth_context,
592                                   DATA_BLOB *session_key,
593                                   bool remote)
594 {
595         krb5_keyblock *skey = NULL;
596         krb5_error_code err = 0;
597         bool ret = false;
598
599         if (remote) {
600 #ifdef HAVE_KRB5_AUTH_CON_GETRECVSUBKEY
601                 err = krb5_auth_con_getrecvsubkey(context,
602                                                   auth_context,
603                                                   &skey);
604 #else /* HAVE_KRB5_AUTH_CON_GETRECVSUBKEY */
605                 err = krb5_auth_con_getremotesubkey(context,
606                                                     auth_context, &skey);
607 #endif /* HAVE_KRB5_AUTH_CON_GETRECVSUBKEY */
608         } else {
609 #ifdef HAVE_KRB5_AUTH_CON_GETSENDSUBKEY
610                 err = krb5_auth_con_getsendsubkey(context,
611                                                   auth_context,
612                                                   &skey);
613 #else /* HAVE_KRB5_AUTH_CON_GETSENDSUBKEY */
614                 err = krb5_auth_con_getlocalsubkey(context,
615                                                    auth_context, &skey);
616 #endif /* HAVE_KRB5_AUTH_CON_GETSENDSUBKEY */
617         }
618
619         if (err || skey == NULL) {
620                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
621                 goto done;
622         }
623
624         DEBUG(10, ("Got KRB5 session key of length %d\n",
625                    (int)KRB5_KEY_LENGTH(skey)));
626
627         *session_key = data_blob_talloc(mem_ctx,
628                                          KRB5_KEY_DATA(skey),
629                                          KRB5_KEY_LENGTH(skey));
630         dump_data_pw("KRB5 Session Key:\n",
631                      session_key->data,
632                      session_key->length);
633
634         ret = true;
635
636 done:
637         if (skey) {
638                 krb5_free_keyblock(context, skey);
639         }
640
641         return ret;
642 }
643
644
645 /**
646  * @brief Get talloced string component of a principal
647  *
648  * @param[in] mem_ctx           The TALLOC_CTX
649  * @param[in] context           The krb5_context
650  * @param[in] principal         The principal
651  * @param[in] component         The component
652  * @return string component
653  *
654  * Caller must talloc_free if the return value is not NULL.
655  *
656  */
657 char *smb_krb5_principal_get_comp_string(TALLOC_CTX *mem_ctx,
658                                          krb5_context context,
659                                          krb5_const_principal principal,
660                                          unsigned int component)
661 {
662 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING)
663         return talloc_strdup(mem_ctx, krb5_principal_get_comp_string(context, principal, component));
664 #else
665         krb5_data *data;
666
667         if (component >= krb5_princ_size(context, principal)) {
668                 return NULL;
669         }
670
671         data = krb5_princ_component(context, principal, component);
672         if (data == NULL) {
673                 return NULL;
674         }
675
676         return talloc_strndup(mem_ctx, data->data, data->length);
677 #endif
678 }
679
680 /**
681  * @brief
682  *
683  * @param[in]  ccache_string A string pointing to the cache to renew the ticket
684  *                           (e.g. FILE:/tmp/krb5cc_0) or NULL. If the principal
685  *                           ccache has not been specified, the default ccache
686  *                           will be used.
687  *
688  * @param[in]  client_string The client principal string (e.g. user@SAMBA.SITE)
689  *                           or NULL. If the principal string has not been
690  *                           specified, the principal from the ccache will be
691  *                           retrieved.
692  *
693  * @param[in]  service_string The service ticket string
694  *                            (e.g. krbtgt/SAMBA.SITE@SAMBA.SITE) or NULL. If
695  *                            the sevice ticket is specified, it is parsed (
696  *                            with the realm part ignored) and used as the
697  *                            server principal of the credential. Otherwise
698  *                            the ticket-granting service is used.
699  *
700  * @param[in]  expire_time    A pointer to store the credentials end time or
701  *                            NULL.
702  *
703  * @return 0 on Succes, a Kerberos error code otherwise.
704  */
705 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,
706                                       const char *client_string,
707                                       const char *service_string,
708                                       time_t *expire_time)
709 {
710         krb5_error_code ret;
711         krb5_context context = NULL;
712         krb5_ccache ccache = NULL;
713         krb5_principal client = NULL;
714         krb5_creds creds, creds_in;
715
716         ZERO_STRUCT(creds);
717         ZERO_STRUCT(creds_in);
718
719         initialize_krb5_error_table();
720         ret = krb5_init_context(&context);
721         if (ret) {
722                 goto done;
723         }
724
725         if (!ccache_string) {
726                 ccache_string = krb5_cc_default_name(context);
727         }
728
729         if (!ccache_string) {
730                 ret = EINVAL;
731                 goto done;
732         }
733
734         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
735
736         /* FIXME: we should not fall back to defaults */
737         ret = krb5_cc_resolve(context, discard_const_p(char, ccache_string), &ccache);
738         if (ret) {
739                 goto done;
740         }
741
742         if (client_string) {
743                 ret = smb_krb5_parse_name(context, client_string, &client);
744                 if (ret) {
745                         goto done;
746                 }
747         } else {
748                 ret = krb5_cc_get_principal(context, ccache, &client);
749                 if (ret) {
750                         goto done;
751                 }
752         }
753
754         ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string));
755         if (ret) {
756                 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
757                 goto done;
758         }
759
760         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
761         ret = krb5_cc_initialize(context, ccache, client);
762         if (ret) {
763                 goto done;
764         }
765
766         ret = krb5_cc_store_cred(context, ccache, &creds);
767
768         if (expire_time) {
769                 *expire_time = (time_t) creds.times.endtime;
770         }
771
772 done:
773         krb5_free_cred_contents(context, &creds_in);
774         krb5_free_cred_contents(context, &creds);
775
776         if (client) {
777                 krb5_free_principal(context, client);
778         }
779         if (ccache) {
780                 krb5_cc_close(context, ccache);
781         }
782         if (context) {
783                 krb5_free_context(context);
784         }
785
786         return ret;
787 }
788
789 /**
790  * @brief Free the data stored in an smb_krb5_addresses structure.
791  *
792  * @param[in]  context  The library context
793  *
794  * @param[in]  addr     The address structure to free.
795  *
796  * @return 0 on success, a Kerberos error code otherwise.
797  */
798 krb5_error_code smb_krb5_free_addresses(krb5_context context,
799                                         smb_krb5_addresses *addr)
800 {
801         krb5_error_code ret = 0;
802         if (addr == NULL) {
803                 return ret;
804         }
805 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
806         krb5_free_addresses(context, addr->addrs);
807 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
808         ret = krb5_free_addresses(context, addr->addrs);
809         SAFE_FREE(addr->addrs);
810 #endif
811         SAFE_FREE(addr);
812         addr = NULL;
813         return ret;
814 }
815
816 #define MAX_NETBIOSNAME_LEN 16
817
818 /**
819  * @brief Add a netbios name to the array of addresses
820  *
821  * @param[in]  kerb_addr A pointer to the smb_krb5_addresses to add the
822  *                       netbios name to.
823  *
824  * @param[in]  netbios_name The netbios name to add.
825  *
826  * @return 0 on success, a Kerberos error code otherwise.
827  */
828 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr,
829                                                    const char *netbios_name)
830 {
831         krb5_error_code ret = 0;
832         char buf[MAX_NETBIOSNAME_LEN];
833         int len;
834 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
835         krb5_address **addrs = NULL;
836 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
837         krb5_addresses *addrs = NULL;
838 #endif
839
840         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
841         if (*kerb_addr == NULL) {
842                 return ENOMEM;
843         }
844
845         /* temporarily duplicate put_name() code here to avoid dependency
846          * issues for a 5 lines function */
847         len = strlen(netbios_name);
848         memcpy(buf, netbios_name,
849                 (len < MAX_NETBIOSNAME_LEN) ? len : MAX_NETBIOSNAME_LEN - 1);
850         if (len < MAX_NETBIOSNAME_LEN - 1) {
851                 memset(buf + len, ' ', MAX_NETBIOSNAME_LEN - 1 - len);
852         }
853         buf[MAX_NETBIOSNAME_LEN - 1] = 0x20;
854
855 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
856         {
857                 int num_addr = 2;
858
859                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
860                 if (addrs == NULL) {
861                         SAFE_FREE(*kerb_addr);
862                         return ENOMEM;
863                 }
864
865                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
866
867                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
868                 if (addrs[0] == NULL) {
869                         SAFE_FREE(addrs);
870                         SAFE_FREE(*kerb_addr);
871                         return ENOMEM;
872                 }
873
874                 addrs[0]->magic = KV5M_ADDRESS;
875                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
876                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
877                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
878                 if (addrs[0]->contents == NULL) {
879                         SAFE_FREE(addrs[0]);
880                         SAFE_FREE(addrs);
881                         SAFE_FREE(*kerb_addr);
882                         return ENOMEM;
883                 }
884
885                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
886
887                 addrs[1] = NULL;
888         }
889 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
890         {
891                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
892                 if (addrs == NULL) {
893                         SAFE_FREE(*kerb_addr);
894                         return ENOMEM;
895                 }
896
897                 memset(addrs, 0, sizeof(krb5_addresses));
898
899                 addrs->len = 1;
900                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
901                 if (addrs->val == NULL) {
902                         SAFE_FREE(addrs);
903                         SAFE_FREE(kerb_addr);
904                         return ENOMEM;
905                 }
906
907                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
908                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
909                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
910                 if (addrs->val[0].address.data == NULL) {
911                         SAFE_FREE(addrs->val);
912                         SAFE_FREE(addrs);
913                         SAFE_FREE(*kerb_addr);
914                         return ENOMEM;
915                 }
916
917                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
918         }
919 #else
920 #error UNKNOWN_KRB5_ADDRESS_FORMAT
921 #endif
922         (*kerb_addr)->addrs = addrs;
923
924         return ret;
925 }
926
927 /**
928  * @brief Get the enctype from a key table entry
929  *
930  * @param[in]  kt_entry Key table entry to get the enctype from.
931  *
932  * @return The enctype from the entry.
933  */
934 krb5_enctype smb_krb5_kt_get_enctype_from_entry(krb5_keytab_entry *kt_entry)
935 {
936         return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
937 }
938
939 /**
940  * @brief Free the contents of a key table entry.
941  *
942  * @param[in]  context The library context.
943  *
944  * @param[in]  kt_entry The key table entry to free the contents of.
945  *
946  * @return 0 on success, a Kerberos error code otherwise.
947  *
948  * The pointer itself is not freed.
949  */
950 krb5_error_code smb_krb5_kt_free_entry(krb5_context context,
951                                         krb5_keytab_entry *kt_entry)
952 {
953 /* Try krb5_free_keytab_entry_contents first, since
954  * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
955  * krb5_kt_free_entry but only has a prototype for the first, while the
956  * second is considered private.
957  */
958 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
959         return krb5_free_keytab_entry_contents(context, kt_entry);
960 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
961         return krb5_kt_free_entry(context, kt_entry);
962 #else
963 #error UNKNOWN_KT_FREE_FUNCTION
964 #endif
965 }
966
967
968 /**
969  * @brief Convert an encryption type to a string.
970  *
971  * @param[in]  context The library context.
972  *
973  * @param[in]  enctype The encryption type.
974  *
975  * @param[in]  etype_s A pointer to store the allocated encryption type as a
976  *                     string.
977  *
978  * @return 0 on success, a Kerberos error code otherwise.
979  *
980  * The caller needs to free the allocated string etype_s.
981  */
982 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
983                                            krb5_enctype enctype,
984                                            char **etype_s)
985 {
986 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
987         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
988 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
989         char buf[256];
990         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
991         if (ret) {
992                 return ret;
993         }
994         *etype_s = SMB_STRDUP(buf);
995         if (!*etype_s) {
996                 return ENOMEM;
997         }
998         return ret;
999 #else
1000 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1001 #endif
1002 }
1003
1004 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1005 #ifndef MAX_KEYTAB_NAME_LEN
1006 #define MAX_KEYTAB_NAME_LEN 1100
1007 #endif
1008
1009 /**
1010  * @brief Open a key table readonly or with readwrite access.
1011  *
1012  * Allows to use a different keytab than the default one using a relative
1013  * path to the keytab.
1014  *
1015  * @param[in]  context  The library context
1016  *
1017  * @param[in]  keytab_name_req The path to the key table.
1018  *
1019  * @param[in]  write_access Open with readwrite access.
1020  *
1021  * @param[in]  keytab A pointer o the opended key table.
1022  *
1023  * The keytab pointer should be freed using krb5_kt_close().
1024  *
1025  * @return 0 on success, a Kerberos error code otherwise.
1026  */
1027 krb5_error_code smb_krb5_kt_open_relative(krb5_context context,
1028                                           const char *keytab_name_req,
1029                                           bool write_access,
1030                                           krb5_keytab *keytab)
1031 {
1032         krb5_error_code ret = 0;
1033         TALLOC_CTX *mem_ctx;
1034         char keytab_string[MAX_KEYTAB_NAME_LEN];
1035         char *kt_str = NULL;
1036         bool found_valid_name = false;
1037         const char *pragma = "FILE";
1038         const char *tmp = NULL;
1039
1040         if (!write_access && !keytab_name_req) {
1041                 /* caller just wants to read the default keytab readonly, so be it */
1042                 return krb5_kt_default(context, keytab);
1043         }
1044
1045         mem_ctx = talloc_init("smb_krb5_open_keytab");
1046         if (!mem_ctx) {
1047                 return ENOMEM;
1048         }
1049
1050 #ifdef HAVE_WRFILE_KEYTAB
1051         if (write_access) {
1052                 pragma = "WRFILE";
1053         }
1054 #endif
1055
1056         if (keytab_name_req) {
1057
1058                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1059                         ret = KRB5_CONFIG_NOTENUFSPACE;
1060                         goto out;
1061                 }
1062
1063                 if ((strncmp(keytab_name_req, "WRFILE:", 7) == 0) ||
1064                     (strncmp(keytab_name_req, "FILE:", 5) == 0)) {
1065                         tmp = keytab_name_req;
1066                         goto resolve;
1067                 }
1068
1069                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1070                 if (!tmp) {
1071                         ret = ENOMEM;
1072                         goto out;
1073                 }
1074
1075                 goto resolve;
1076         }
1077
1078         /* we need to handle more complex keytab_strings, like:
1079          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1080
1081         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1082         if (ret) {
1083                 goto out;
1084         }
1085
1086         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1087
1088         tmp = talloc_strdup(mem_ctx, keytab_string);
1089         if (!tmp) {
1090                 ret = ENOMEM;
1091                 goto out;
1092         }
1093
1094         if (strncmp(tmp, "ANY:", 4) == 0) {
1095                 tmp += 4;
1096         }
1097
1098         memset(&keytab_string, '\0', sizeof(keytab_string));
1099
1100         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1101                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1102                         found_valid_name = true;
1103                         tmp = kt_str;
1104                         tmp += 7;
1105                 }
1106
1107                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1108                         found_valid_name = true;
1109                         tmp = kt_str;
1110                         tmp += 5;
1111                 }
1112
1113                 if (tmp[0] == '/') {
1114                         /* Treat as a FILE: keytab definition. */
1115                         found_valid_name = true;
1116                 }
1117
1118                 if (found_valid_name) {
1119                         if (tmp[0] != '/') {
1120                                 ret = KRB5_KT_BADNAME;
1121                                 goto out;
1122                         }
1123
1124                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1125                         if (!tmp) {
1126                                 ret = ENOMEM;
1127                                 goto out;
1128                         }
1129                         break;
1130                 }
1131         }
1132
1133         if (!found_valid_name) {
1134                 ret = KRB5_KT_UNKNOWN_TYPE;
1135                 goto out;
1136         }
1137
1138 resolve:
1139         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1140         ret = krb5_kt_resolve(context, tmp, keytab);
1141
1142 out:
1143         TALLOC_FREE(mem_ctx);
1144         return ret;
1145 }
1146
1147 /**
1148  * @brief Open a key table readonly or with readwrite access.
1149  *
1150  * Allows to use a different keytab than the default one. The path needs to be
1151  * an absolute path or an error will be returned.
1152  *
1153  * @param[in]  context  The library context
1154  *
1155  * @param[in]  keytab_name_req The path to the key table.
1156  *
1157  * @param[in]  write_access Open with readwrite access.
1158  *
1159  * @param[in]  keytab A pointer o the opended key table.
1160  *
1161  * The keytab pointer should be freed using krb5_kt_close().
1162  *
1163  * @return 0 on success, a Kerberos error code otherwise.
1164  */
1165 krb5_error_code smb_krb5_kt_open(krb5_context context,
1166                                  const char *keytab_name_req,
1167                                  bool write_access,
1168                                  krb5_keytab *keytab)
1169 {
1170         int cmp;
1171
1172         if (keytab_name_req == NULL) {
1173                 return KRB5_KT_BADNAME;
1174         }
1175
1176         if (keytab_name_req[0] == '/') {
1177                 goto open_keytab;
1178         }
1179
1180         cmp = strncmp(keytab_name_req, "FILE:/", 6);
1181         if (cmp == 0) {
1182                 goto open_keytab;
1183         }
1184
1185         cmp = strncmp(keytab_name_req, "WRFILE:/", 8);
1186         if (cmp == 0) {
1187                 goto open_keytab;
1188         }
1189
1190         DBG_WARNING("ERROR: Invalid keytab name: %s\n", keytab_name_req);
1191
1192         return KRB5_KT_BADNAME;
1193
1194 open_keytab:
1195         return smb_krb5_kt_open_relative(context,
1196                                          keytab_name_req,
1197                                          write_access,
1198                                          keytab);
1199 }
1200
1201 /**
1202  * @brief Get a key table name.
1203  *
1204  * @param[in]  mem_ctx The talloc context to use for allocation.
1205  *
1206  * @param[in]  context The library context.
1207  *
1208  * @param[in]  keytab The key table to get the name from.
1209  *
1210  * @param[in]  keytab_name A talloc'ed string of the key table name.
1211  *
1212  * The talloc'ed name string needs to be freed with talloc_free().
1213  *
1214  * @return 0 on success, a Kerberos error code otherwise.
1215  */
1216 krb5_error_code smb_krb5_kt_get_name(TALLOC_CTX *mem_ctx,
1217                                      krb5_context context,
1218                                      krb5_keytab keytab,
1219                                      const char **keytab_name)
1220 {
1221         char keytab_string[MAX_KEYTAB_NAME_LEN];
1222         krb5_error_code ret = 0;
1223
1224         ret = krb5_kt_get_name(context, keytab,
1225                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1226         if (ret) {
1227                 return ret;
1228         }
1229
1230         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1231         if (!*keytab_name) {
1232                 return ENOMEM;
1233         }
1234
1235         return ret;
1236 }
1237
1238 /**
1239  * @brief Seek and delete old entries in a keytab based on the passed
1240  *        principal.
1241  *
1242  * @param[in]  context       The KRB5 context to use.
1243  *
1244  * @param[in]  keytab        The keytab to operate on.
1245  *
1246  * @param[in]  kvno          The kvnco to use.
1247  *
1248  * @param[in]  princ_s       The principal as a string to search for.
1249  *
1250  * @param[in]  princ         The principal as a krb5_principal to search for.
1251  *
1252  * @param[in]  flush         Weather to flush the complete keytab.
1253  *
1254  * @param[in]  keep_old_entries Keep the entry with the previous kvno.
1255  *
1256  * @retval 0 on Sucess
1257  *
1258  * @return An appropriate KRB5 error code.
1259  */
1260 krb5_error_code smb_krb5_kt_seek_and_delete_old_entries(krb5_context context,
1261                                                         krb5_keytab keytab,
1262                                                         krb5_kvno kvno,
1263                                                         krb5_enctype enctype,
1264                                                         const char *princ_s,
1265                                                         krb5_principal princ,
1266                                                         bool flush,
1267                                                         bool keep_old_entries)
1268 {
1269         krb5_error_code ret;
1270         krb5_kt_cursor cursor;
1271         krb5_keytab_entry kt_entry;
1272         char *ktprinc = NULL;
1273         krb5_kvno old_kvno = kvno - 1;
1274         TALLOC_CTX *tmp_ctx;
1275
1276         ZERO_STRUCT(cursor);
1277         ZERO_STRUCT(kt_entry);
1278
1279         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
1280         if (ret == KRB5_KT_END || ret == ENOENT ) {
1281                 /* no entries */
1282                 return 0;
1283         }
1284
1285         tmp_ctx = talloc_new(NULL);
1286         if (tmp_ctx == NULL) {
1287                 return ENOMEM;
1288         }
1289
1290         DEBUG(3, (__location__ ": Will try to delete old keytab entries\n"));
1291         while (!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) {
1292                 bool name_ok = false;
1293                 krb5_enctype kt_entry_enctype =
1294                         smb_krb5_kt_get_enctype_from_entry(&kt_entry);
1295
1296                 if (!flush && (princ_s != NULL)) {
1297                         ret = smb_krb5_unparse_name(tmp_ctx, context,
1298                                                     kt_entry.principal,
1299                                                     &ktprinc);
1300                         if (ret) {
1301                                 DEBUG(1, (__location__
1302                                           ": smb_krb5_unparse_name failed "
1303                                           "(%s)\n", error_message(ret)));
1304                                 goto out;
1305                         }
1306
1307 #ifdef HAVE_KRB5_KT_COMPARE
1308                         name_ok = krb5_kt_compare(context, &kt_entry,
1309                                                   princ, 0, 0);
1310 #else
1311                         name_ok = (strcmp(ktprinc, princ_s) == 0);
1312 #endif
1313
1314                         if (!name_ok) {
1315                                 DEBUG(10, (__location__ ": ignoring keytab "
1316                                            "entry principal %s, kvno = %d\n",
1317                                            ktprinc, kt_entry.vno));
1318
1319                                 /* Not a match,
1320                                  * just free this entry and continue. */
1321                                 ret = smb_krb5_kt_free_entry(context,
1322                                                              &kt_entry);
1323                                 ZERO_STRUCT(kt_entry);
1324                                 if (ret) {
1325                                         DEBUG(1, (__location__
1326                                                   ": smb_krb5_kt_free_entry "
1327                                                   "failed (%s)\n",
1328                                                   error_message(ret)));
1329                                         goto out;
1330                                 }
1331
1332                                 TALLOC_FREE(ktprinc);
1333                                 continue;
1334                         }
1335
1336                         TALLOC_FREE(ktprinc);
1337                 }
1338
1339                 /*------------------------------------------------------------
1340                  * Save the entries with kvno - 1. This is what microsoft does
1341                  * to allow people with existing sessions that have kvno - 1
1342                  * to still work. Otherwise, when the password for the machine
1343                  * changes, all kerberizied sessions will 'break' until either
1344                  * the client reboots or the client's session key expires and
1345                  * they get a new session ticket with the new kvno.
1346                  * Some keytab files only store the kvno in 8bits, limit
1347                  * the compare accordingly.
1348                  */
1349
1350                 if (!flush && ((kt_entry.vno & 0xff) == (old_kvno & 0xff))) {
1351                         DEBUG(5, (__location__ ": Saving previous (kvno %d) "
1352                                   "entry for principal: %s.\n",
1353                                   old_kvno, princ_s));
1354                         continue;
1355                 }
1356
1357                 if (keep_old_entries) {
1358                         DEBUG(5, (__location__ ": Saving old (kvno %d) "
1359                                   "entry for principal: %s.\n",
1360                                   kvno, princ_s));
1361                         continue;
1362                 }
1363
1364                 if (!flush &&
1365                     (kt_entry.vno == kvno) &&
1366                     (kt_entry_enctype != enctype))
1367                 {
1368                         DEBUG(5, (__location__ ": Saving entry with kvno [%d] "
1369                                   "enctype [%d] for principal: %s.\n",
1370                                   kvno, kt_entry_enctype, princ_s));
1371                         continue;
1372                 }
1373
1374                 DEBUG(5, (__location__ ": Found old entry for principal: %s "
1375                           "(kvno %d) - trying to remove it.\n",
1376                           princ_s, kt_entry.vno));
1377
1378                 ret = krb5_kt_end_seq_get(context, keytab, &cursor);
1379                 ZERO_STRUCT(cursor);
1380                 if (ret) {
1381                         DEBUG(1, (__location__ ": krb5_kt_end_seq_get() "
1382                                   "failed (%s)\n", error_message(ret)));
1383                         goto out;
1384                 }
1385                 ret = krb5_kt_remove_entry(context, keytab, &kt_entry);
1386                 if (ret) {
1387                         DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
1388                                   "failed (%s)\n", error_message(ret)));
1389                         goto out;
1390                 }
1391
1392                 DEBUG(5, (__location__ ": removed old entry for principal: "
1393                           "%s (kvno %d).\n", princ_s, kt_entry.vno));
1394
1395                 ret = krb5_kt_start_seq_get(context, keytab, &cursor);
1396                 if (ret) {
1397                         DEBUG(1, (__location__ ": krb5_kt_start_seq() failed "
1398                                   "(%s)\n", error_message(ret)));
1399                         goto out;
1400                 }
1401                 ret = smb_krb5_kt_free_entry(context, &kt_entry);
1402                 ZERO_STRUCT(kt_entry);
1403                 if (ret) {
1404                         DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
1405                                   "failed (%s)\n", error_message(ret)));
1406                         goto out;
1407                 }
1408         }
1409
1410 out:
1411         talloc_free(tmp_ctx);
1412         if (!all_zero((uint8_t *)&kt_entry, sizeof(kt_entry))) {
1413                 smb_krb5_kt_free_entry(context, &kt_entry);
1414         }
1415         if (!all_zero((uint8_t *)&cursor, sizeof(cursor))) {
1416                 krb5_kt_end_seq_get(context, keytab, &cursor);
1417         }
1418         return ret;
1419 }
1420
1421 /**
1422  * @brief Add a keytab entry for the given principal
1423  *
1424  * @param[in]  context       The krb5 context to use.
1425  *
1426  * @param[in]  keytab        The keytab to add the entry to.
1427  *
1428  * @param[in]  kvno          The kvno to use.
1429  *
1430  * @param[in]  princ_s       The principal as a string.
1431  *
1432  * @param[in]  salt_principal The salt principal to salt the password with.
1433  *                            Only needed for keys which support salting.
1434  *                            If no salt is used set no_salt to false and
1435  *                            pass NULL here.
1436  *
1437  * @param[in]  enctype        The encryption type of the keytab entry.
1438  *
1439  * @param[in]  password       The password of the keytab entry.
1440  *
1441  * @param[in]  no_salt        If the password should not be salted. Normally
1442  *                            this is only set to false for encryption types
1443  *                            which do not support salting like RC4.
1444  *
1445  * @param[in]  keep_old_entries Wether to keep or delte old keytab entries.
1446  *
1447  * @retval 0 on Success
1448  *
1449  * @return A corresponding KRB5 error code.
1450  *
1451  * @see smb_krb5_kt_open()
1452  */
1453 krb5_error_code smb_krb5_kt_add_entry(krb5_context context,
1454                                       krb5_keytab keytab,
1455                                       krb5_kvno kvno,
1456                                       const char *princ_s,
1457                                       const char *salt_principal,
1458                                       krb5_enctype enctype,
1459                                       krb5_data *password,
1460                                       bool no_salt,
1461                                       bool keep_old_entries)
1462 {
1463         krb5_error_code ret;
1464         krb5_keytab_entry kt_entry;
1465         krb5_principal princ = NULL;
1466         krb5_keyblock *keyp;
1467
1468         ZERO_STRUCT(kt_entry);
1469
1470         ret = smb_krb5_parse_name(context, princ_s, &princ);
1471         if (ret) {
1472                 DEBUG(1, (__location__ ": smb_krb5_parse_name(%s) "
1473                           "failed (%s)\n", princ_s, error_message(ret)));
1474                 goto out;
1475         }
1476
1477         /* Seek and delete old keytab entries */
1478         ret = smb_krb5_kt_seek_and_delete_old_entries(context,
1479                                                       keytab,
1480                                                       kvno,
1481                                                       enctype,
1482                                                       princ_s,
1483                                                       princ,
1484                                                       false,
1485                                                       keep_old_entries);
1486         if (ret) {
1487                 goto out;
1488         }
1489
1490         /* If we get here, we have deleted all the old entries with kvno's
1491          * not equal to the current kvno-1. */
1492
1493         keyp = KRB5_KT_KEY(&kt_entry);
1494
1495         if (no_salt) {
1496                 KRB5_KEY_DATA(keyp) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
1497                 if (KRB5_KEY_DATA(keyp) == NULL) {
1498                         ret = ENOMEM;
1499                         goto out;
1500                 }
1501                 memcpy(KRB5_KEY_DATA(keyp), password->data, password->length);
1502                 KRB5_KEY_LENGTH(keyp) = password->length;
1503                 KRB5_KEY_TYPE(keyp) = enctype;
1504         } else {
1505                 krb5_principal salt_princ = NULL;
1506
1507                 /* Now add keytab entries for all encryption types */
1508                 ret = smb_krb5_parse_name(context, salt_principal, &salt_princ);
1509                 if (ret) {
1510                         DBG_WARNING("krb5_parse_name(%s) failed (%s)\n",
1511                                     salt_principal, error_message(ret));
1512                         goto out;
1513                 }
1514
1515                 ret = smb_krb5_create_key_from_string(context,
1516                                                       salt_princ,
1517                                                       NULL,
1518                                                       password,
1519                                                       enctype,
1520                                                       keyp);
1521                 krb5_free_principal(context, salt_princ);
1522                 if (ret != 0) {
1523                         goto out;
1524                 }
1525         }
1526
1527         kt_entry.principal = princ;
1528         kt_entry.vno       = kvno;
1529
1530         DEBUG(3, (__location__ ": adding keytab entry for (%s) with "
1531                   "encryption type (%d) and version (%d)\n",
1532                   princ_s, enctype, kt_entry.vno));
1533         ret = krb5_kt_add_entry(context, keytab, &kt_entry);
1534         krb5_free_keyblock_contents(context, keyp);
1535         ZERO_STRUCT(kt_entry);
1536         if (ret) {
1537                 DEBUG(1, (__location__ ": adding entry to keytab "
1538                           "failed (%s)\n", error_message(ret)));
1539                 goto out;
1540         }
1541
1542 out:
1543         if (princ) {
1544                 krb5_free_principal(context, princ);
1545         }
1546
1547         return ret;
1548 }
1549
1550 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1551     defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1552     defined(HAVE_KRB5_GET_CREDS)
1553 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1554                                                              krb5_ccache ccache,
1555                                                              krb5_principal me,
1556                                                              krb5_principal server,
1557                                                              krb5_principal impersonate_princ,
1558                                                              krb5_creds **out_creds)
1559 {
1560         krb5_error_code ret;
1561         krb5_get_creds_opt opt;
1562
1563         ret = krb5_get_creds_opt_alloc(context, &opt);
1564         if (ret) {
1565                 goto done;
1566         }
1567         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1568
1569         if (impersonate_princ) {
1570                 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1571                                                          impersonate_princ);
1572                 if (ret) {
1573                         goto done;
1574                 }
1575         }
1576
1577         ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1578         if (ret) {
1579                 goto done;
1580         }
1581
1582  done:
1583         if (opt) {
1584                 krb5_get_creds_opt_free(context, opt);
1585         }
1586         return ret;
1587 }
1588 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1589
1590 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1591
1592 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1593 krb5_error_code KRB5_CALLCONV
1594 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1595                               krb5_ccache ccache, krb5_creds *in_creds,
1596                               krb5_data *subject_cert,
1597                               krb5_creds **out_creds);
1598 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1599
1600 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1601                                                          krb5_ccache ccache,
1602                                                          krb5_principal me,
1603                                                          krb5_principal server,
1604                                                          krb5_principal impersonate_princ,
1605                                                          krb5_creds **out_creds)
1606 {
1607         krb5_error_code ret;
1608         krb5_creds in_creds;
1609
1610         ZERO_STRUCT(in_creds);
1611
1612         if (impersonate_princ) {
1613
1614                 in_creds.server = me;
1615                 in_creds.client = impersonate_princ;
1616
1617                 ret = krb5_get_credentials_for_user(context,
1618                                                     0, /* krb5_flags options */
1619                                                     ccache,
1620                                                     &in_creds,
1621                                                     NULL, /* krb5_data *subject_cert */
1622                                                     out_creds);
1623         } else {
1624                 in_creds.client = me;
1625                 in_creds.server = server;
1626
1627                 ret = krb5_get_credentials(context, 0, ccache,
1628                                            &in_creds, out_creds);
1629         }
1630
1631         return ret;
1632 }
1633 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1634
1635 /*
1636  * smb_krb5_get_credentials
1637  *
1638  * @brief Get krb5 credentials for a server
1639  *
1640  * @param[in] context           An initialized krb5_context
1641  * @param[in] ccache            An initialized krb5_ccache
1642  * @param[in] me                The krb5_principal of the caller
1643  * @param[in] server            The krb5_principal of the requested service
1644  * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1645  * @param[out] out_creds        The returned krb5_creds structure
1646  * @return krb5_error_code
1647  *
1648  */
1649 krb5_error_code smb_krb5_get_credentials(krb5_context context,
1650                                          krb5_ccache ccache,
1651                                          krb5_principal me,
1652                                          krb5_principal server,
1653                                          krb5_principal impersonate_princ,
1654                                          krb5_creds **out_creds)
1655 {
1656         krb5_error_code ret;
1657         krb5_creds *creds = NULL;
1658
1659         if (out_creds != NULL) {
1660                 *out_creds = NULL;
1661         }
1662
1663         if (impersonate_princ) {
1664 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
1665                 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
1666 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
1667                 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
1668 #else
1669                 ret = ENOTSUP;
1670 #endif
1671         } else {
1672                 krb5_creds in_creds;
1673
1674                 ZERO_STRUCT(in_creds);
1675
1676                 in_creds.client = me;
1677                 in_creds.server = server;
1678
1679                 ret = krb5_get_credentials(context, 0, ccache,
1680                                            &in_creds, &creds);
1681         }
1682         if (ret) {
1683                 goto done;
1684         }
1685
1686         if (out_creds) {
1687                 *out_creds = creds;
1688         }
1689
1690  done:
1691         if (creds && ret) {
1692                 krb5_free_creds(context, creds);
1693         }
1694
1695         return ret;
1696 }
1697
1698 /**
1699  * @brief Initialize a krb5_keyblock with the given data.
1700  *
1701  * Initialized a new keyblock, allocates the contents fo the key and
1702  * copies the data into the keyblock.
1703  *
1704  * @param[in]  context  The library context
1705  *
1706  * @param[in]  enctype  The encryption type.
1707  *
1708  * @param[in]  data     The date to initialize the keyblock with.
1709  *
1710  * @param[in]  length   The length of the keyblock.
1711  *
1712  * @param[in]  key      Newly allocated keyblock structure.
1713  *
1714  * The key date must be freed using krb5_free_keyblock_contents() when it is
1715  * no longer needed.
1716  *
1717  * @return 0 on success, a Kerberos error code otherwise.
1718  */
1719 krb5_error_code smb_krb5_keyblock_init_contents(krb5_context context,
1720                                                 krb5_enctype enctype,
1721                                                 const void *data,
1722                                                 size_t length,
1723                                                 krb5_keyblock *key)
1724 {
1725 #if defined(HAVE_KRB5_KEYBLOCK_INIT)
1726         return krb5_keyblock_init(context, enctype, data, length, key);
1727 #else
1728         memset(key, 0, sizeof(krb5_keyblock));
1729         KRB5_KEY_DATA(key) = SMB_MALLOC(length);
1730         if (NULL == KRB5_KEY_DATA(key)) {
1731                 return ENOMEM;
1732         }
1733         memcpy(KRB5_KEY_DATA(key), data, length);
1734         KRB5_KEY_LENGTH(key) = length;
1735         KRB5_KEY_TYPE(key) = enctype;
1736         return 0;
1737 #endif
1738 }
1739
1740 /**
1741  * @brief Simulate a kinit by putting the tgt in the given credential cache.
1742  *
1743  * This function uses a keyblock rather than needingthe original password.
1744  *
1745  * @param[in]  ctx      The library context
1746  *
1747  * @param[in]  cc       The credential cache to put the tgt in.
1748  *
1749  * @param[in]  principal The client princial
1750  *
1751  * @param[in]  keyblock  The keyblock to use.
1752  *
1753  * @param[in]  target_service The service name of the initial credentials (or NULL).
1754  *
1755  * @param[in]  krb_options Initial credential options.
1756  *
1757  * @param[in]  expire_time    A pointer to store the experation time of the
1758  *                            credentials (or NULL).
1759  *
1760  * @param[in]  kdc_time       A pointer to store the time when the ticket becomes
1761  *                            valid (or NULL).
1762  *
1763  * @return 0 on success, a Kerberos error code otherwise.
1764  */
1765 krb5_error_code smb_krb5_kinit_keyblock_ccache(krb5_context ctx,
1766                                                krb5_ccache cc,
1767                                                krb5_principal principal,
1768                                                krb5_keyblock *keyblock,
1769                                                const char *target_service,
1770                                                krb5_get_init_creds_opt *krb_options,
1771                                                time_t *expire_time,
1772                                                time_t *kdc_time)
1773 {
1774         krb5_error_code code = 0;
1775         krb5_creds my_creds;
1776
1777 #if defined(HAVE_KRB5_GET_INIT_CREDS_KEYBLOCK)
1778         code = krb5_get_init_creds_keyblock(ctx, &my_creds, principal,
1779                                             keyblock, 0, target_service,
1780                                             krb_options);
1781 #elif defined(HAVE_KRB5_GET_INIT_CREDS_KEYTAB)
1782 {
1783 #define SMB_CREDS_KEYTAB "MEMORY:tmp_smb_creds_XXXXXX"
1784         char tmp_name[sizeof(SMB_CREDS_KEYTAB)];
1785         krb5_keytab_entry entry;
1786         krb5_keytab keytab;
1787         mode_t mask;
1788
1789         memset(&entry, 0, sizeof(entry));
1790         entry.principal = principal;
1791         *(KRB5_KT_KEY(&entry)) = *keyblock;
1792
1793         memcpy(tmp_name, SMB_CREDS_KEYTAB, sizeof(SMB_CREDS_KEYTAB));
1794         mask = umask(S_IRWXO | S_IRWXG);
1795         mktemp(tmp_name);
1796         umask(mask);
1797         if (tmp_name[0] == 0) {
1798                 return KRB5_KT_BADNAME;
1799         }
1800         code = krb5_kt_resolve(ctx, tmp_name, &keytab);
1801         if (code) {
1802                 return code;
1803         }
1804
1805         code = krb5_kt_add_entry(ctx, keytab, &entry);
1806         if (code) {
1807                 (void)krb5_kt_close(ctx, keytab);
1808                 goto done;
1809         }
1810
1811         code = krb5_get_init_creds_keytab(ctx, &my_creds, principal,
1812                                           keytab, 0, target_service,
1813                                           krb_options);
1814         (void)krb5_kt_close(ctx, keytab);
1815 }
1816 #else
1817 #error krb5_get_init_creds_keyblock not available!
1818 #endif
1819         if (code) {
1820                 return code;
1821         }
1822
1823 #ifndef SAMBA4_USES_HEIMDAL /* MIT */
1824         /*
1825          * We need to store the principal as returned from the KDC to the
1826          * credentials cache. If we don't do that the KRB5 library is not
1827          * able to find the tickets it is looking for
1828          */
1829         principal = my_creds.client;
1830 #endif
1831         code = krb5_cc_initialize(ctx, cc, principal);
1832         if (code) {
1833                 goto done;
1834         }
1835
1836         code = krb5_cc_store_cred(ctx, cc, &my_creds);
1837         if (code) {
1838                 goto done;
1839         }
1840
1841         if (expire_time) {
1842                 *expire_time = (time_t) my_creds.times.endtime;
1843         }
1844
1845         if (kdc_time) {
1846                 *kdc_time = (time_t) my_creds.times.starttime;
1847         }
1848
1849         code = 0;
1850 done:
1851         krb5_free_cred_contents(ctx, &my_creds);
1852         return code;
1853 }
1854
1855 /**
1856  * @brief Simulate a kinit by putting the tgt in the given credential cache.
1857  *
1858  * @param[in]  ctx      The library context
1859  *
1860  * @param[in]  cc       The credential cache to put the tgt in.
1861  *
1862  * @param[in]  principal The client princial
1863  *
1864  * @param[in]  password  The password (or NULL).
1865  *
1866  * @param[in]  target_service The service name of the initial credentials (or NULL).
1867  *
1868  * @param[in]  krb_options Initial credential options.
1869  *
1870  * @param[in]  expire_time    A pointer to store the experation time of the
1871  *                            credentials (or NULL).
1872  *
1873  * @param[in]  kdc_time       A pointer to store the time when the ticket becomes
1874  *                            valid (or NULL).
1875  *
1876  * @return 0 on success, a Kerberos error code otherwise.
1877  */
1878 krb5_error_code smb_krb5_kinit_password_ccache(krb5_context ctx,
1879                                                krb5_ccache cc,
1880                                                krb5_principal principal,
1881                                                const char *password,
1882                                                const char *target_service,
1883                                                krb5_get_init_creds_opt *krb_options,
1884                                                time_t *expire_time,
1885                                                time_t *kdc_time)
1886 {
1887         krb5_error_code code = 0;
1888         krb5_creds my_creds;
1889
1890         code = krb5_get_init_creds_password(ctx, &my_creds, principal,
1891                                             password, NULL, NULL, 0,
1892                                             target_service, krb_options);
1893         if (code) {
1894                 return code;
1895         }
1896
1897 #ifndef SAMBA4_USES_HEIMDAL /* MIT */
1898         /*
1899          * We need to store the principal as returned from the KDC to the
1900          * credentials cache. If we don't do that the KRB5 library is not
1901          * able to find the tickets it is looking for
1902          */
1903         principal = my_creds.client;
1904 #endif
1905         code = krb5_cc_initialize(ctx, cc, principal);
1906         if (code) {
1907                 goto done;
1908         }
1909
1910         code = krb5_cc_store_cred(ctx, cc, &my_creds);
1911         if (code) {
1912                 goto done;
1913         }
1914
1915         if (expire_time) {
1916                 *expire_time = (time_t) my_creds.times.endtime;
1917         }
1918
1919         if (kdc_time) {
1920                 *kdc_time = (time_t) my_creds.times.starttime;
1921         }
1922
1923         code = 0;
1924 done:
1925         krb5_free_cred_contents(ctx, &my_creds);
1926         return code;
1927 }
1928
1929 #ifdef SAMBA4_USES_HEIMDAL
1930 /**
1931  * @brief Simulate a kinit by putting the tgt in the given credential cache.
1932  *
1933  * @param[in]  ctx      The library context
1934  *
1935  * @param[in]  cc       The credential cache to store the tgt in.
1936  *
1937  * @param[in]  principal The initial client princial.
1938  *
1939  * @param[in]  password  The password (or NULL).
1940  *
1941  * @param[in]  impersonate_principal The impersonatiion principal (or NULL).
1942  *
1943  * @param[in]  self_service The local service for S4U2Self if
1944  *                          impersonate_principal is specified).
1945  *
1946  * @param[in]  target_service The service name of the initial credentials
1947  *                            (kpasswd/REALM or a remote service). It defaults
1948  *                            to the krbtgt if NULL.
1949  *
1950  * @param[in]  krb_options Initial credential options.
1951  *
1952  * @param[in]  expire_time    A pointer to store the experation time of the
1953  *                            credentials (or NULL).
1954  *
1955  * @param[in]  kdc_time       A pointer to store the time when the ticket becomes
1956  *                            valid (or NULL).
1957  *
1958  * @return 0 on success, a Kerberos error code otherwise.
1959  */
1960 krb5_error_code smb_krb5_kinit_s4u2_ccache(krb5_context ctx,
1961                                            krb5_ccache store_cc,
1962                                            krb5_principal init_principal,
1963                                            const char *init_password,
1964                                            krb5_principal impersonate_principal,
1965                                            const char *self_service,
1966                                            const char *target_service,
1967                                            krb5_get_init_creds_opt *krb_options,
1968                                            time_t *expire_time,
1969                                            time_t *kdc_time)
1970 {
1971         krb5_error_code code = 0;
1972         krb5_get_creds_opt options;
1973         krb5_principal store_principal;
1974         krb5_creds store_creds;
1975         krb5_creds *s4u2self_creds;
1976         Ticket s4u2self_ticket;
1977         size_t s4u2self_ticketlen;
1978         krb5_creds *s4u2proxy_creds;
1979         krb5_principal self_princ;
1980         bool s4u2proxy;
1981         krb5_principal target_princ;
1982         krb5_ccache tmp_cc;
1983         const char *self_realm;
1984         const char *client_realm = NULL;
1985         krb5_principal blacklist_principal = NULL;
1986         krb5_principal whitelist_principal = NULL;
1987
1988         code = krb5_get_init_creds_password(ctx, &store_creds,
1989                                             init_principal,
1990                                             init_password,
1991                                             NULL, NULL,
1992                                             0,
1993                                             NULL,
1994                                             krb_options);
1995         if (code != 0) {
1996                 return code;
1997         }
1998
1999         store_principal = init_principal;
2000
2001         /*
2002          * We are trying S4U2Self now:
2003          *
2004          * As we do not want to expose our TGT in the
2005          * krb5_ccache, which is also holds the impersonated creds.
2006          *
2007          * Some low level krb5/gssapi function might use the TGT
2008          * identity and let the client act as our machine account.
2009          *
2010          * We need to avoid that and use a temporary krb5_ccache
2011          * in order to pass our TGT to the krb5_get_creds() function.
2012          */
2013         code = krb5_cc_new_unique(ctx, NULL, NULL, &tmp_cc);
2014         if (code != 0) {
2015                 krb5_free_cred_contents(ctx, &store_creds);
2016                 return code;
2017         }
2018
2019         code = krb5_cc_initialize(ctx, tmp_cc, store_creds.client);
2020         if (code != 0) {
2021                 krb5_cc_destroy(ctx, tmp_cc);
2022                 krb5_free_cred_contents(ctx, &store_creds);
2023                 return code;
2024         }
2025
2026         code = krb5_cc_store_cred(ctx, tmp_cc, &store_creds);
2027         if (code != 0) {
2028                 krb5_free_cred_contents(ctx, &store_creds);
2029                 krb5_cc_destroy(ctx, tmp_cc);
2030                 return code;
2031         }
2032
2033         /*
2034          * we need to remember the client principal of our
2035          * TGT and make sure the KDC does not return this
2036          * in the impersonated tickets. This can happen
2037          * if the KDC does not support S4U2Self and S4U2Proxy.
2038          */
2039         blacklist_principal = store_creds.client;
2040         store_creds.client = NULL;
2041         krb5_free_cred_contents(ctx, &store_creds);
2042
2043         /*
2044          * Check if we also need S4U2Proxy or if S4U2Self is
2045          * enough in order to get a ticket for the target.
2046          */
2047         if (target_service == NULL) {
2048                 s4u2proxy = false;
2049         } else if (strcmp(target_service, self_service) == 0) {
2050                 s4u2proxy = false;
2051         } else {
2052                 s4u2proxy = true;
2053         }
2054
2055         /*
2056          * For S4U2Self we need our own service principal,
2057          * which belongs to our own realm (available on
2058          * our client principal).
2059          */
2060         self_realm = krb5_principal_get_realm(ctx, init_principal);
2061
2062         code = krb5_parse_name(ctx, self_service, &self_princ);
2063         if (code != 0) {
2064                 krb5_free_principal(ctx, blacklist_principal);
2065                 krb5_cc_destroy(ctx, tmp_cc);
2066                 return code;
2067         }
2068
2069         code = krb5_principal_set_realm(ctx, self_princ, self_realm);
2070         if (code != 0) {
2071                 krb5_free_principal(ctx, blacklist_principal);
2072                 krb5_free_principal(ctx, self_princ);
2073                 krb5_cc_destroy(ctx, tmp_cc);
2074                 return code;
2075         }
2076
2077         code = krb5_get_creds_opt_alloc(ctx, &options);
2078         if (code != 0) {
2079                 krb5_free_principal(ctx, blacklist_principal);
2080                 krb5_free_principal(ctx, self_princ);
2081                 krb5_cc_destroy(ctx, tmp_cc);
2082                 return code;
2083         }
2084
2085         if (s4u2proxy) {
2086                 /*
2087                  * If we want S4U2Proxy, we need the forwardable flag
2088                  * on the S4U2Self ticket.
2089                  */
2090                 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
2091         }
2092
2093         code = krb5_get_creds_opt_set_impersonate(ctx, options,
2094                                                   impersonate_principal);
2095         if (code != 0) {
2096                 krb5_get_creds_opt_free(ctx, options);
2097                 krb5_free_principal(ctx, blacklist_principal);
2098                 krb5_free_principal(ctx, self_princ);
2099                 krb5_cc_destroy(ctx, tmp_cc);
2100                 return code;
2101         }
2102
2103         code = krb5_get_creds(ctx, options, tmp_cc,
2104                               self_princ, &s4u2self_creds);
2105         krb5_get_creds_opt_free(ctx, options);
2106         krb5_free_principal(ctx, self_princ);
2107         if (code != 0) {
2108                 krb5_free_principal(ctx, blacklist_principal);
2109                 krb5_cc_destroy(ctx, tmp_cc);
2110                 return code;
2111         }
2112
2113         if (!s4u2proxy) {
2114                 krb5_cc_destroy(ctx, tmp_cc);
2115
2116                 /*
2117                  * Now make sure we store the impersonated principal
2118                  * and creds instead of the TGT related stuff
2119                  * in the krb5_ccache of the caller.
2120                  */
2121                 code = krb5_copy_creds_contents(ctx, s4u2self_creds,
2122                                                 &store_creds);
2123                 krb5_free_creds(ctx, s4u2self_creds);
2124                 if (code != 0) {
2125                         return code;
2126                 }
2127
2128                 /*
2129                  * It's important to store the principal the KDC
2130                  * returned, as otherwise the caller would not find
2131                  * the S4U2Self ticket in the krb5_ccache lookup.
2132                  */
2133                 store_principal = store_creds.client;
2134                 goto store;
2135         }
2136
2137         /*
2138          * We are trying S4U2Proxy:
2139          *
2140          * We need the ticket from the S4U2Self step
2141          * and our TGT in order to get the delegated ticket.
2142          */
2143         code = decode_Ticket((const uint8_t *)s4u2self_creds->ticket.data,
2144                              s4u2self_creds->ticket.length,
2145                              &s4u2self_ticket,
2146                              &s4u2self_ticketlen);
2147         if (code != 0) {
2148                 krb5_free_creds(ctx, s4u2self_creds);
2149                 krb5_free_principal(ctx, blacklist_principal);
2150                 krb5_cc_destroy(ctx, tmp_cc);
2151                 return code;
2152         }
2153
2154         /*
2155          * we need to remember the client principal of the
2156          * S4U2Self stage and as it needs to match the one we
2157          * will get for the S4U2Proxy stage. We need this
2158          * in order to detect KDCs which does not support S4U2Proxy.
2159          */
2160         whitelist_principal = s4u2self_creds->client;
2161         s4u2self_creds->client = NULL;
2162         krb5_free_creds(ctx, s4u2self_creds);
2163
2164         /*
2165          * For S4U2Proxy we also got a target service principal,
2166          * which also belongs to our own realm (available on
2167          * our client principal).
2168          */
2169         code = krb5_parse_name(ctx, target_service, &target_princ);
2170         if (code != 0) {
2171                 free_Ticket(&s4u2self_ticket);
2172                 krb5_free_principal(ctx, whitelist_principal);
2173                 krb5_free_principal(ctx, blacklist_principal);
2174                 krb5_cc_destroy(ctx, tmp_cc);
2175                 return code;
2176         }
2177
2178         code = krb5_principal_set_realm(ctx, target_princ, self_realm);
2179         if (code != 0) {
2180                 free_Ticket(&s4u2self_ticket);
2181                 krb5_free_principal(ctx, target_princ);
2182                 krb5_free_principal(ctx, whitelist_principal);
2183                 krb5_free_principal(ctx, blacklist_principal);
2184                 krb5_cc_destroy(ctx, tmp_cc);
2185                 return code;
2186         }
2187
2188         code = krb5_get_creds_opt_alloc(ctx, &options);
2189         if (code != 0) {
2190                 free_Ticket(&s4u2self_ticket);
2191                 krb5_free_principal(ctx, target_princ);
2192                 krb5_free_principal(ctx, whitelist_principal);
2193                 krb5_free_principal(ctx, blacklist_principal);
2194                 krb5_cc_destroy(ctx, tmp_cc);
2195                 return code;
2196         }
2197
2198         krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
2199         krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_CONSTRAINED_DELEGATION);
2200
2201         code = krb5_get_creds_opt_set_ticket(ctx, options, &s4u2self_ticket);
2202         free_Ticket(&s4u2self_ticket);
2203         if (code != 0) {
2204                 krb5_get_creds_opt_free(ctx, options);
2205                 krb5_free_principal(ctx, target_princ);
2206                 krb5_free_principal(ctx, whitelist_principal);
2207                 krb5_free_principal(ctx, blacklist_principal);
2208                 krb5_cc_destroy(ctx, tmp_cc);
2209                 return code;
2210         }
2211
2212         code = krb5_get_creds(ctx, options, tmp_cc,
2213                               target_princ, &s4u2proxy_creds);
2214         krb5_get_creds_opt_free(ctx, options);
2215         krb5_free_principal(ctx, target_princ);
2216         krb5_cc_destroy(ctx, tmp_cc);
2217         if (code != 0) {
2218                 krb5_free_principal(ctx, whitelist_principal);
2219                 krb5_free_principal(ctx, blacklist_principal);
2220                 return code;
2221         }
2222
2223         /*
2224          * Now make sure we store the impersonated principal
2225          * and creds instead of the TGT related stuff
2226          * in the krb5_ccache of the caller.
2227          */
2228         code = krb5_copy_creds_contents(ctx, s4u2proxy_creds,
2229                                         &store_creds);
2230         krb5_free_creds(ctx, s4u2proxy_creds);
2231         if (code != 0) {
2232                 krb5_free_principal(ctx, whitelist_principal);
2233                 krb5_free_principal(ctx, blacklist_principal);
2234                 return code;
2235         }
2236
2237         /*
2238          * It's important to store the principal the KDC
2239          * returned, as otherwise the caller would not find
2240          * the S4U2Self ticket in the krb5_ccache lookup.
2241          */
2242         store_principal = store_creds.client;
2243
2244  store:
2245         if (blacklist_principal &&
2246             krb5_principal_compare(ctx, store_creds.client, blacklist_principal)) {
2247                 char *sp = NULL;
2248                 char *ip = NULL;
2249
2250                 code = krb5_unparse_name(ctx, blacklist_principal, &sp);
2251                 if (code != 0) {
2252                         sp = NULL;
2253                 }
2254                 code = krb5_unparse_name(ctx, impersonate_principal, &ip);
2255                 if (code != 0) {
2256                         ip = NULL;
2257                 }
2258                 DEBUG(1, ("smb_krb5_kinit_password_cache: "
2259                           "KDC returned self principal[%s] while impersonating [%s]\n",
2260                           sp?sp:"<no memory>",
2261                           ip?ip:"<no memory>"));
2262
2263                 SAFE_FREE(sp);
2264                 SAFE_FREE(ip);
2265
2266                 krb5_free_principal(ctx, whitelist_principal);
2267                 krb5_free_principal(ctx, blacklist_principal);
2268                 krb5_free_cred_contents(ctx, &store_creds);
2269                 return KRB5_FWD_BAD_PRINCIPAL;
2270         }
2271         if (blacklist_principal) {
2272                 krb5_free_principal(ctx, blacklist_principal);
2273         }
2274
2275         if (whitelist_principal &&
2276             !krb5_principal_compare(ctx, store_creds.client, whitelist_principal)) {
2277                 char *sp = NULL;
2278                 char *ep = NULL;
2279
2280                 code = krb5_unparse_name(ctx, store_creds.client, &sp);
2281                 if (code != 0) {
2282                         sp = NULL;
2283                 }
2284                 code = krb5_unparse_name(ctx, whitelist_principal, &ep);
2285                 if (code != 0) {
2286                         ep = NULL;
2287                 }
2288                 DEBUG(1, ("smb_krb5_kinit_password_cache: "
2289                           "KDC returned wrong principal[%s] we expected [%s]\n",
2290                           sp?sp:"<no memory>",
2291                           ep?ep:"<no memory>"));
2292
2293                 SAFE_FREE(sp);
2294                 SAFE_FREE(ep);
2295
2296                 krb5_free_principal(ctx, whitelist_principal);
2297                 krb5_free_cred_contents(ctx, &store_creds);
2298                 return KRB5_FWD_BAD_PRINCIPAL;
2299         }
2300         if (whitelist_principal) {
2301                 krb5_free_principal(ctx, whitelist_principal);
2302         }
2303
2304         code = krb5_cc_initialize(ctx, store_cc, store_principal);
2305         if (code != 0) {
2306                 krb5_free_cred_contents(ctx, &store_creds);
2307                 return code;
2308         }
2309
2310         code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
2311         if (code != 0) {
2312                 krb5_free_cred_contents(ctx, &store_creds);
2313                 return code;
2314         }
2315
2316         client_realm = krb5_principal_get_realm(ctx, store_creds.client);
2317         if (client_realm != NULL) {
2318                 /*
2319                  * Because the CANON flag doesn't have any impact
2320                  * on the impersonate_principal => store_creds.client
2321                  * realm mapping. We need to store the credentials twice,
2322                  * once with the returned realm and once with the
2323                  * realm of impersonate_principal.
2324                  */
2325                 code = krb5_principal_set_realm(ctx, store_creds.server,
2326                                                 client_realm);
2327                 if (code != 0) {
2328                         krb5_free_cred_contents(ctx, &store_creds);
2329                         return code;
2330                 }
2331
2332                 code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
2333                 if (code != 0) {
2334                         krb5_free_cred_contents(ctx, &store_creds);
2335                         return code;
2336                 }
2337         }
2338
2339         if (expire_time) {
2340                 *expire_time = (time_t) store_creds.times.endtime;
2341         }
2342
2343         if (kdc_time) {
2344                 *kdc_time = (time_t) store_creds.times.starttime;
2345         }
2346
2347         krb5_free_cred_contents(ctx, &store_creds);
2348
2349         return 0;
2350 }
2351 #endif
2352
2353 #if !defined(HAVE_KRB5_MAKE_PRINCIPAL) && defined(HAVE_KRB5_BUILD_PRINCIPAL_ALLOC_VA)
2354 /**
2355  * @brief Create a principal name using a variable argument list.
2356  *
2357  * @param[in]  context  The library context.
2358  *
2359  * @param[inout]  principal A pointer to the principal structure.
2360  *
2361  * @param[in]  _realm    The realm to use. If NULL then the function will
2362  *                       get the default realm name.
2363  *
2364  * @param[in]  ...       A list of 'char *' components, ending with NULL.
2365  *
2366  * Use krb5_free_principal() to free the principal when it is no longer needed.
2367  *
2368  * @return 0 on success, a Kerberos error code otherwise.
2369  */
2370 krb5_error_code smb_krb5_make_principal(krb5_context context,
2371                                         krb5_principal *principal,
2372                                         const char *_realm, ...)
2373 {
2374         krb5_error_code code;
2375         bool free_realm;
2376         char *realm;
2377         va_list ap;
2378
2379         if (_realm) {
2380                 realm = discard_const_p(char, _realm);
2381                 free_realm = false;
2382         } else {
2383                 code = krb5_get_default_realm(context, &realm);
2384                 if (code) {
2385                         return code;
2386                 }
2387                 free_realm = true;
2388         }
2389
2390         va_start(ap, _realm);
2391         code = krb5_build_principal_alloc_va(context, principal,
2392                                              strlen(realm), realm,
2393                                              ap);
2394         va_end(ap);
2395
2396         if (free_realm) {
2397                 krb5_free_default_realm(context, realm);
2398         }
2399
2400         return code;
2401 }
2402 #endif
2403
2404 #if !defined(HAVE_KRB5_CC_GET_LIFETIME) && defined(HAVE_KRB5_CC_RETRIEVE_CRED)
2405 /**
2406  * @brief Get the lifetime of the initial ticket in the cache.
2407  *
2408  * @param[in]  context  The kerberos context.
2409  *
2410  * @param[in]  id       The credential cache to get the ticket lifetime.
2411  *
2412  * @param[out] t        A pointer to a time value to store the lifetime.
2413  *
2414  * @return              0 on success, a krb5_error_code on error.
2415  */
2416 krb5_error_code smb_krb5_cc_get_lifetime(krb5_context context,
2417                                          krb5_ccache id,
2418                                          time_t *t)
2419 {
2420         krb5_cc_cursor cursor;
2421         krb5_error_code kerr;
2422         krb5_creds cred;
2423         krb5_timestamp now;
2424
2425         *t = 0;
2426
2427         kerr = krb5_timeofday(context, &now);
2428         if (kerr) {
2429                 return kerr;
2430         }
2431
2432         kerr = krb5_cc_start_seq_get(context, id, &cursor);
2433         if (kerr) {
2434                 return kerr;
2435         }
2436
2437         while ((kerr = krb5_cc_next_cred(context, id, &cursor, &cred)) == 0) {
2438 #ifndef HAVE_FLAGS_IN_KRB5_CREDS
2439                 if (cred.ticket_flags & TKT_FLG_INITIAL) {
2440 #else
2441                 if (cred.flags.b.initial) {
2442 #endif
2443                         if (now < cred.times.endtime) {
2444                                 *t = (time_t) (cred.times.endtime - now);
2445                         }
2446                         krb5_free_cred_contents(context, &cred);
2447                         break;
2448                 }
2449                 krb5_free_cred_contents(context, &cred);
2450         }
2451
2452         krb5_cc_end_seq_get(context, id, &cursor);
2453
2454         return kerr;
2455 }
2456 #endif /* HAVE_KRB5_CC_GET_LIFETIME */
2457
2458 #if !defined(HAVE_KRB5_FREE_CHECKSUM_CONTENTS) && defined(HAVE_FREE_CHECKSUM)
2459 void smb_krb5_free_checksum_contents(krb5_context ctx, krb5_checksum *cksum)
2460 {
2461         free_Checksum(cksum);
2462 }
2463 #endif
2464
2465 /**
2466  * @brief Compute a checksum operating on a keyblock.
2467  *
2468  * This function computes a checksum over a PAC using the keyblock for a keyed
2469  * checksum.
2470  *
2471  * @param[in]  mem_ctx A talloc context to alocate the signature on.
2472  *
2473  * @param[in]  pac_data The PAC as input.
2474  *
2475  * @param[in]  context  The library context.
2476  *
2477  * @param[in]  keyblock Encryption key for a keyed checksum.
2478  *
2479  * @param[out] sig_type The checksum type
2480  *
2481  * @param[out] sig_blob The talloc'ed checksum
2482  *
2483  * The caller must free the sig_blob with talloc_free() when it is not needed
2484  * anymore.
2485  *
2486  * @return 0 on success, a Kerberos error code otherwise.
2487  */
2488 krb5_error_code smb_krb5_make_pac_checksum(TALLOC_CTX *mem_ctx,
2489                                            DATA_BLOB *pac_data,
2490                                            krb5_context context,
2491                                            const krb5_keyblock *keyblock,
2492                                            uint32_t *sig_type,
2493                                            DATA_BLOB *sig_blob)
2494 {
2495         krb5_error_code ret;
2496         krb5_checksum cksum;
2497 #if defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CREATE_CHECKSUM)
2498         krb5_crypto crypto;
2499
2500
2501         ret = krb5_crypto_init(context,
2502                                keyblock,
2503                                0,
2504                                &crypto);
2505         if (ret) {
2506                 DEBUG(0,("krb5_crypto_init() failed: %s\n",
2507                           smb_get_krb5_error_message(context, ret, mem_ctx)));
2508                 return ret;
2509         }
2510         ret = krb5_create_checksum(context,
2511                                    crypto,
2512                                    KRB5_KU_OTHER_CKSUM,
2513                                    0,
2514                                    pac_data->data,
2515                                    pac_data->length,
2516                                    &cksum);
2517         if (ret) {
2518                 DEBUG(2, ("PAC Verification failed: %s\n",
2519                           smb_get_krb5_error_message(context, ret, mem_ctx)));
2520         }
2521
2522         krb5_crypto_destroy(context, crypto);
2523
2524         if (ret) {
2525                 return ret;
2526         }
2527
2528         *sig_type = cksum.cksumtype;
2529         *sig_blob = data_blob_talloc(mem_ctx,
2530                                         cksum.checksum.data,
2531                                         cksum.checksum.length);
2532 #elif defined(HAVE_KRB5_C_MAKE_CHECKSUM)
2533         krb5_data input;
2534
2535         input.data = (char *)pac_data->data;
2536         input.length = pac_data->length;
2537
2538         ret = krb5_c_make_checksum(context,
2539                                    0,
2540                                    keyblock,
2541                                    KRB5_KEYUSAGE_APP_DATA_CKSUM,
2542                                    &input,
2543                                    &cksum);
2544         if (ret) {
2545                 DEBUG(2, ("PAC Verification failed: %s\n",
2546                           smb_get_krb5_error_message(context, ret, mem_ctx)));
2547                 return ret;
2548         }
2549
2550         *sig_type = cksum.checksum_type;
2551         *sig_blob = data_blob_talloc(mem_ctx,
2552                                         cksum.contents,
2553                                         cksum.length);
2554
2555 #else
2556 #error krb5_create_checksum or krb5_c_make_checksum not available
2557 #endif /* HAVE_KRB5_C_MAKE_CHECKSUM */
2558         smb_krb5_free_checksum_contents(context, &cksum);
2559
2560         return 0;
2561 }
2562
2563
2564 /**
2565  * @brief Get realm of a principal
2566  *
2567  * @param[in] context   The library context
2568  *
2569  * @param[in] principal The principal to get the realm from.
2570  *
2571  * @return An allocated string with the realm or NULL if an error occurred.
2572  *
2573  * The caller must free the realm string with free() if not needed anymore.
2574  */
2575 char *smb_krb5_principal_get_realm(krb5_context context,
2576                                    krb5_const_principal principal)
2577 {
2578 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2579         return strdup(discard_const_p(char, krb5_principal_get_realm(context, principal)));
2580 #elif defined(krb5_princ_realm) /* MIT */
2581         krb5_data *realm;
2582         realm = discard_const_p(krb5_data,
2583                                 krb5_princ_realm(context, principal));
2584         return strndup(realm->data, realm->length);
2585 #else
2586 #error UNKNOWN_GET_PRINC_REALM_FUNCTIONS
2587 #endif
2588 }
2589
2590 /**
2591  * @brief Get realm of a principal
2592  *
2593  * @param[in] context   The library context
2594  *
2595  * @param[in] principal The principal to set the realm
2596  *
2597  * @param[in] realm     The realm as a string to set.
2598  *
2599  * @retur 0 on success, a Kerberos error code otherwise.
2600  */
2601 krb5_error_code smb_krb5_principal_set_realm(krb5_context context,
2602                                              krb5_principal principal,
2603                                              const char *realm)
2604 {
2605 #ifdef HAVE_KRB5_PRINCIPAL_SET_REALM /* Heimdal */
2606         return krb5_principal_set_realm(context, principal, realm);
2607 #elif defined(krb5_princ_realm) && defined(krb5_princ_set_realm) /* MIT */
2608         krb5_error_code ret;
2609         krb5_data data;
2610         krb5_data *old_data;
2611
2612         old_data = krb5_princ_realm(context, principal);
2613
2614         ret = smb_krb5_copy_data_contents(&data,
2615                                           realm,
2616                                           strlen(realm));
2617         if (ret) {
2618                 return ret;
2619         }
2620
2621         /* free realm before setting */
2622         free(old_data->data);
2623
2624         krb5_princ_set_realm(context, principal, &data);
2625
2626         return ret;
2627 #else
2628 #error UNKNOWN_PRINC_SET_REALM_FUNCTION
2629 #endif
2630 }
2631
2632
2633 /**
2634  * @brief Get the realm from the service hostname.
2635  *
2636  * This function will look for a domain realm mapping in the [domain_realm]
2637  * section of the krb5.conf first and fallback to extract the realm from
2638  * the provided service hostname. As a last resort it will return the
2639  * provided client_realm.
2640  *
2641  * @param[in]  mem_ctx     The talloc context
2642  *
2643  * @param[in]  hostname    The service hostname
2644  *
2645  * @param[in]  client_realm  If we can not find a mapping, fall back to
2646  *                           this realm.
2647  *
2648  * @return The realm to use for the service hostname, NULL if a fatal error
2649  *         occured.
2650  */
2651 char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
2652                                        const char *hostname,
2653                                        const char *client_realm)
2654 {
2655 #if defined(HAVE_KRB5_REALM_TYPE)
2656         /* Heimdal. */
2657         krb5_realm *realm_list = NULL;
2658 #else
2659         /* MIT */
2660         char **realm_list = NULL;
2661 #endif
2662         char *realm = NULL;
2663         krb5_error_code kerr;
2664         krb5_context ctx = NULL;
2665
2666         initialize_krb5_error_table();
2667         if (krb5_init_context(&ctx)) {
2668                 return NULL;
2669         }
2670
2671         kerr = krb5_get_host_realm(ctx, hostname, &realm_list);
2672         if (kerr == KRB5_ERR_HOST_REALM_UNKNOWN) {
2673                 realm_list = NULL;
2674                 kerr = 0;
2675         }
2676         if (kerr != 0) {
2677                 DEBUG(3,("kerberos_get_realm_from_hostname %s: "
2678                         "failed %s\n",
2679                         hostname ? hostname : "(NULL)",
2680                         error_message(kerr) ));
2681                 goto out;
2682         }
2683
2684         if (realm_list != NULL &&
2685             realm_list[0] != NULL &&
2686             realm_list[0][0] != '\0') {
2687                 realm = talloc_strdup(mem_ctx, realm_list[0]);
2688                 if (realm == NULL) {
2689                         goto out;
2690                 }
2691         } else {
2692                 const char *p = NULL;
2693
2694                 /*
2695                  * "dc6.samba2003.example.com"
2696                  * returns a realm of "SAMBA2003.EXAMPLE.COM"
2697                  *
2698                  * "dc6." returns realm as NULL
2699                  */
2700                 p = strchr_m(hostname, '.');
2701                 if (p != NULL && p[1] != '\0') {
2702                         realm = talloc_strdup_upper(mem_ctx, p + 1);
2703                         if (realm == NULL) {
2704                                 goto out;
2705                         }
2706                 }
2707         }
2708
2709         if (realm == NULL) {
2710                 realm = talloc_strdup(mem_ctx, client_realm);
2711         }
2712
2713   out:
2714
2715         if (ctx) {
2716                 if (realm_list) {
2717                         krb5_free_host_realm(ctx, realm_list);
2718                         realm_list = NULL;
2719                 }
2720                 krb5_free_context(ctx);
2721                 ctx = NULL;
2722         }
2723         return realm;
2724 }
2725
2726 /**
2727  * @brief Get an error string from a Kerberos error code.
2728  *
2729  * @param[in]  context  The library context.
2730  *
2731  * @param[in]  code     The Kerberos error code.
2732  *
2733  * @param[in]  mem_ctx  The talloc context to allocate the error string on.
2734  *
2735  * @return A talloc'ed error string or NULL if an error occurred.
2736  *
2737  * The caller must free the returned error string with talloc_free() if not
2738  * needed anymore
2739  */
2740 char *smb_get_krb5_error_message(krb5_context context,
2741                                  krb5_error_code code,
2742                                  TALLOC_CTX *mem_ctx)
2743 {
2744         char *ret;
2745
2746 #if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
2747         const char *context_error = krb5_get_error_message(context, code);
2748         if (context_error) {
2749                 ret = talloc_asprintf(mem_ctx, "%s: %s",
2750                                         error_message(code), context_error);
2751                 krb5_free_error_message(context, context_error);
2752                 return ret;
2753         }
2754 #endif
2755         ret = talloc_strdup(mem_ctx, error_message(code));
2756         return ret;
2757 }
2758
2759
2760 /**
2761  * @brief Return the kerberos library setting for: libdefaults:allow_weak_crypto
2762  *
2763  * @param[in]  context  The library context
2764  *
2765  * @return True if weak crypto is allowed, false if not.
2766  */
2767 krb5_boolean smb_krb5_get_allowed_weak_crypto(krb5_context context)
2768 #if defined(HAVE_KRB5_CONFIG_GET_BOOL_DEFAULT)
2769 {
2770         return krb5_config_get_bool_default(context,
2771                                             NULL,
2772                                             FALSE,
2773                                             "libdefaults",
2774                                             "allow_weak_crypto",
2775                                             NULL);
2776 }
2777 #elif defined(HAVE_PROFILE_H) && defined(HAVE_KRB5_GET_PROFILE)
2778 {
2779 #include <profile.h>
2780         krb5_error_code ret;
2781         krb5_boolean ret_default = false;
2782         profile_t profile;
2783         int ret_profile;
2784
2785         ret = krb5_get_profile(context,
2786                                &profile);
2787         if (ret) {
2788                 return ret_default;
2789         }
2790
2791         ret = profile_get_boolean(profile,
2792                                   "libdefaults",
2793                                   "allow_weak_crypto",
2794                                   NULL, /* subsubname */
2795                                   ret_default, /* def_val */
2796                                   &ret_profile /* *ret_default */);
2797         if (ret) {
2798                 return ret_default;
2799         }
2800
2801         profile_release(profile);
2802
2803         return ret_profile;
2804 }
2805 #else
2806 #error UNKNOWN_KRB5_CONFIG_ROUTINES
2807 #endif
2808
2809 /**
2810  * @brief Return the type of a krb5_principal
2811  *
2812  * @param[in]  context  The library context.
2813  *
2814  * @param[in]  principal The principal to get the type from.
2815  *
2816  * @return The integer type of the principal.
2817  */
2818 int smb_krb5_principal_get_type(krb5_context context,
2819                                 krb5_const_principal principal)
2820 {
2821 #ifdef HAVE_KRB5_PRINCIPAL_GET_TYPE /* Heimdal */
2822         return krb5_principal_get_type(context, principal);
2823 #elif defined(krb5_princ_type) /* MIT */
2824         return krb5_princ_type(context, principal);
2825 #else
2826 #error  UNKNOWN_PRINC_GET_TYPE_FUNCTION
2827 #endif
2828 }
2829
2830 /**
2831  * @brief Set the type of a principal
2832  *
2833  * @param[in]  context  The library context
2834  *
2835  * @param[inout] principal The principal to set the type for.
2836  *
2837  * @param[in]  type     The principal type to set.
2838  */
2839 void smb_krb5_principal_set_type(krb5_context context,
2840                                  krb5_principal principal,
2841                                  int type)
2842 {
2843 #ifdef HAVE_KRB5_PRINCIPAL_SET_TYPE /* Heimdal */
2844         krb5_principal_set_type(context, principal, type);
2845 #elif defined(krb5_princ_type) /* MIT */
2846         krb5_princ_type(context, principal) = type;
2847 #else
2848 #error  UNKNOWN_PRINC_SET_TYPE_FUNCTION
2849 #endif
2850 }
2851
2852 #if !defined(HAVE_KRB5_WARNX)
2853 /**
2854  * @brief Log a Kerberos message
2855  *
2856  * It sends the message to com_err.
2857  *
2858  * @param[in]  context  The library context
2859  *
2860  * @param[in]  fmt      The message format
2861  *
2862  * @param[in]  ...      The message arguments
2863  *
2864  * @return 0 on success.
2865  */
2866 krb5_error_code krb5_warnx(krb5_context context, const char *fmt, ...)
2867 {
2868         va_list args;
2869
2870         va_start(args, fmt);
2871         com_err_va("samba-kdc", errno, fmt, args);
2872         va_end(args);
2873
2874         return 0;
2875 }
2876 #endif
2877
2878 /**
2879  * @brief Copy a credential cache.
2880  *
2881  * @param[in]  context  The library context.
2882  *
2883  * @param[in]  incc     Credential cache to be copied.
2884  *
2885  * @param[inout] outcc  Copy of credential cache to be filled in.
2886  *
2887  * @return 0 on success, a Kerberos error code otherwise.
2888  */
2889 krb5_error_code smb_krb5_cc_copy_creds(krb5_context context,
2890                                        krb5_ccache incc, krb5_ccache outcc)
2891 {
2892 #ifdef HAVE_KRB5_CC_COPY_CACHE /* Heimdal */
2893         return krb5_cc_copy_cache(context, incc, outcc);
2894 #elif defined(HAVE_KRB5_CC_COPY_CREDS)
2895         krb5_error_code ret;
2896         krb5_principal princ = NULL;
2897
2898         ret = krb5_cc_get_principal(context, incc, &princ);
2899         if (ret != 0) {
2900                 return ret;
2901         }
2902         ret = krb5_cc_initialize(context, outcc, princ);
2903         krb5_free_principal(context, princ);
2904         if (ret != 0) {
2905                 return ret;
2906         }
2907         return krb5_cc_copy_creds(context, incc, outcc);
2908 #else
2909 #error UNKNOWN_KRB5_CC_COPY_CACHE_OR_CREDS_FUNCTION
2910 #endif
2911 }
2912
2913 /**********************************************************
2914  * ADS KRB5 CALLS
2915  **********************************************************/
2916
2917 static bool ads_cleanup_expired_creds(krb5_context context,
2918                                       krb5_ccache  ccache,
2919                                       krb5_creds  *credsp)
2920 {
2921         krb5_error_code retval;
2922         const char *cc_type = krb5_cc_get_type(context, ccache);
2923
2924         DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
2925                   cc_type, krb5_cc_get_name(context, ccache),
2926                   http_timestring(talloc_tos(), credsp->times.endtime)));
2927
2928         /* we will probably need new tickets if the current ones
2929            will expire within 10 seconds.
2930         */
2931         if (credsp->times.endtime >= (time(NULL) + 10))
2932                 return false;
2933
2934         /* heimdal won't remove creds from a file ccache, and
2935            perhaps we shouldn't anyway, since internally we
2936            use memory ccaches, and a FILE one probably means that
2937            we're using creds obtained outside of our exectuable
2938         */
2939         if (strequal(cc_type, "FILE")) {
2940                 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
2941                 return false;
2942         }
2943
2944         retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
2945         if (retval) {
2946                 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
2947                           error_message(retval)));
2948                 /* If we have an error in this, we want to display it,
2949                    but continue as though we deleted it */
2950         }
2951         return true;
2952 }
2953
2954 /* Allocate and setup the auth context into the state we need. */
2955
2956 static krb5_error_code ads_setup_auth_context(krb5_context context,
2957                                               krb5_auth_context *auth_context)
2958 {
2959         krb5_error_code retval;
2960
2961         retval = krb5_auth_con_init(context, auth_context );
2962         if (retval) {
2963                 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
2964                         error_message(retval)));
2965                 return retval;
2966         }
2967
2968         /* Ensure this is an addressless ticket. */
2969         retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
2970         if (retval) {
2971                 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
2972                         error_message(retval)));
2973         }
2974
2975         return retval;
2976 }
2977
2978 #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)
2979 static krb5_error_code ads_create_gss_checksum(krb5_data *in_data, /* [inout] */
2980                                                uint32_t gss_flags)
2981 {
2982         unsigned int orig_length = in_data->length;
2983         unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
2984         char *gss_cksum = NULL;
2985
2986         if (orig_length) {
2987                 /* Extra length field for delgated ticket. */
2988                 base_cksum_size += 4;
2989         }
2990
2991         if ((unsigned int)base_cksum_size + orig_length <
2992                         (unsigned int)base_cksum_size) {
2993                 return EINVAL;
2994         }
2995
2996         gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
2997         if (gss_cksum == NULL) {
2998                 return ENOMEM;
2999         }
3000
3001         memset(gss_cksum, '\0', base_cksum_size + orig_length);
3002         SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
3003
3004         /*
3005          * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
3006          * This matches the behavior of heimdal and mit.
3007          *
3008          * And it is needed to work against some closed source
3009          * SMB servers.
3010          *
3011          * See bug #7883
3012          */
3013         memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
3014
3015         SIVAL(gss_cksum, 20, gss_flags);
3016
3017         if (orig_length) {
3018                 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
3019                 SSVAL(gss_cksum, 26, orig_length);
3020                 /* Copy the kerberos KRB_CRED data */
3021                 memcpy(gss_cksum + 28, in_data->data, orig_length);
3022                 free(in_data->data);
3023                 in_data->data = NULL;
3024                 in_data->length = 0;
3025         }
3026         in_data->data = gss_cksum;
3027         in_data->length = base_cksum_size + orig_length;
3028         return 0;
3029 }
3030 #endif
3031
3032 /*
3033  * We can't use krb5_mk_req because w2k wants the service to be in a particular
3034  * format.
3035  */
3036 static krb5_error_code ads_krb5_mk_req(krb5_context context,
3037                                        krb5_auth_context *auth_context,
3038                                        const krb5_flags ap_req_options,
3039                                        const char *principal,
3040                                        krb5_ccache ccache,
3041                                        krb5_data *outbuf,
3042                                        time_t *expire_time,
3043                                        const char *impersonate_princ_s)
3044 {
3045         krb5_error_code retval;
3046         krb5_principal server;
3047         krb5_principal impersonate_princ = NULL;
3048         krb5_creds *credsp;
3049         krb5_creds creds;
3050         krb5_data in_data;
3051         bool creds_ready = false;
3052         int i = 0, maxtries = 3;
3053         bool ok;
3054
3055         ZERO_STRUCT(in_data);
3056
3057         retval = smb_krb5_parse_name(context, principal, &server);
3058         if (retval != 0) {
3059                 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
3060                 return retval;
3061         }
3062
3063         if (impersonate_princ_s) {
3064                 retval = smb_krb5_parse_name(context, impersonate_princ_s,
3065                                              &impersonate_princ);
3066                 if (retval) {
3067                         DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
3068                         goto cleanup_princ;
3069                 }
3070         }
3071
3072         /* obtain ticket & session key */
3073         ZERO_STRUCT(creds);
3074         if ((retval = krb5_copy_principal(context, server, &creds.server))) {
3075                 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
3076                          error_message(retval)));
3077                 goto cleanup_princ;
3078         }
3079
3080         retval = krb5_cc_get_principal(context, ccache, &creds.client);
3081         if (retval != 0) {
3082                 /* This can commonly fail on smbd startup with no ticket in the cache.
3083                  * Report at higher level than 1. */
3084                 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
3085                          error_message(retval)));
3086                 goto cleanup_creds;
3087         }
3088
3089         while (!creds_ready && (i < maxtries)) {
3090
3091                 retval = smb_krb5_get_credentials(context,
3092                                                   ccache,
3093                                                   creds.client,
3094                                                   creds.server,
3095                                                   impersonate_princ,
3096                                                   &credsp);
3097                 if (retval != 0) {
3098                         DBG_WARNING("smb_krb5_get_credentials failed for %s "
3099                                     "(%s)\n",
3100                                     principal,
3101                                     error_message(retval));
3102                         goto cleanup_creds;
3103                 }
3104
3105                 /* cope with ticket being in the future due to clock skew */
3106                 if ((unsigned)credsp->times.starttime > time(NULL)) {
3107                         time_t t = time(NULL);
3108                         int time_offset =(int)((unsigned)credsp->times.starttime-t);
3109                         DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
3110                         krb5_set_real_time(context, t + time_offset + 1, 0);
3111                 }
3112
3113                 ok = ads_cleanup_expired_creds(context, ccache, credsp);
3114                 if (!ok) {
3115                         creds_ready = true;
3116                 }
3117
3118                 i++;
3119         }
3120
3121         DBG_DEBUG("Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
3122                   principal,
3123                   krb5_cc_get_type(context, ccache),
3124                   krb5_cc_get_name(context, ccache),
3125                   http_timestring(talloc_tos(),
3126                                   (unsigned)credsp->times.endtime),
3127                   (unsigned)credsp->times.endtime);
3128
3129         if (expire_time) {
3130                 *expire_time = (time_t)credsp->times.endtime;
3131         }
3132
3133         /* Allocate the auth_context. */
3134         retval = ads_setup_auth_context(context, auth_context);
3135         if (retval != 0) {
3136                 DBG_WARNING("ads_setup_auth_context failed (%s)\n",
3137                             error_message(retval));
3138                 goto cleanup_creds;
3139         }
3140
3141 #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)
3142         {
3143                 uint32_t gss_flags = 0;
3144
3145                 if (credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE) {
3146                         /*
3147                          * Fetch a forwarded TGT from the KDC so that we can
3148                          * hand off a 2nd ticket as part of the kerberos
3149                          * exchange.
3150                          */
3151
3152                         DBG_INFO("Server marked as OK to delegate to, building "
3153                                  "forwardable TGT\n");
3154
3155                         retval = krb5_auth_con_setuseruserkey(context,
3156                                         *auth_context,
3157                                         &credsp->keyblock );
3158                         if (retval != 0) {
3159                                 DBG_WARNING("krb5_auth_con_setuseruserkey "
3160                                             "failed (%s)\n",
3161                                             error_message(retval));
3162                                 goto cleanup_creds;
3163                         }
3164
3165                         /* Must use a subkey for forwarded tickets. */
3166                         retval = krb5_auth_con_setflags(context,
3167                                                         *auth_context,
3168                                                         KRB5_AUTH_CONTEXT_USE_SUBKEY);
3169                         if (retval != 0) {
3170                                 DBG_WARNING("krb5_auth_con_setflags failed (%s)\n",
3171                                             error_message(retval));
3172                                 goto cleanup_creds;
3173                         }
3174
3175                         retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
3176                                 *auth_context,  /* Authentication context [in] */
3177                                 discard_const_p(char, KRB5_TGS_NAME),  /* Ticket service name ("krbtgt") [in] */
3178                                 credsp->client, /* Client principal for the tgt [in] */
3179                                 credsp->server, /* Server principal for the tgt [in] */
3180                                 ccache,         /* Credential cache to use for storage [in] */
3181                                 1,              /* Turn on for "Forwardable ticket" [in] */
3182                                 &in_data );     /* Resulting response [out] */
3183
3184                         if (retval) {
3185                                 DBG_INFO("krb5_fwd_tgt_creds failed (%s)\n",
3186                                          error_message(retval));
3187
3188                                 /*
3189                                  * This is not fatal. Delete the *auth_context and continue
3190                                  * with krb5_mk_req_extended to get a non-forwardable ticket.
3191                                  */
3192
3193                                 if (in_data.data) {
3194                                         free( in_data.data );
3195                                         in_data.data = NULL;
3196                                         in_data.length = 0;
3197                                 }
3198                                 krb5_auth_con_free(context, *auth_context);
3199                                 *auth_context = NULL;
3200                                 retval = ads_setup_auth_context(context, auth_context);
3201                                 if (retval != 0) {
3202                                         DBG_WARNING("ads_setup_auth_context failed (%s)\n",
3203                                                     error_message(retval));
3204                                         goto cleanup_creds;
3205                                 }
3206                         } else {
3207                                 /* We got a delegated ticket. */
3208                                 gss_flags |= GSS_C_DELEG_FLAG;
3209                         }
3210                 }
3211
3212                 /* Frees and reallocates in_data into a GSS checksum blob. */
3213                 retval = ads_create_gss_checksum(&in_data, gss_flags);
3214                 if (retval != 0) {
3215                         goto cleanup_data;
3216                 }
3217
3218                 /* We always want GSS-checksum types. */
3219                 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
3220                 if (retval != 0) {
3221                         DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
3222                                 error_message(retval)));
3223                         goto cleanup_data;
3224                 }
3225         }
3226 #endif
3227
3228         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
3229                                       &in_data, credsp, outbuf);
3230         if (retval != 0) {
3231                 DBG_WARNING("krb5_mk_req_extended failed (%s)\n",
3232                             error_message(retval));
3233         }
3234
3235 #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)
3236 cleanup_data:
3237 #endif
3238
3239         if (in_data.data) {
3240                 free( in_data.data );
3241                 in_data.length = 0;
3242         }
3243
3244         krb5_free_creds(context, credsp);
3245
3246 cleanup_creds:
3247         krb5_free_cred_contents(context, &creds);
3248
3249 cleanup_princ:
3250         krb5_free_principal(context, server);
3251         if (impersonate_princ) {
3252                 krb5_free_principal(context, impersonate_princ);
3253         }
3254
3255         return retval;
3256 }
3257
3258 /*
3259   get a kerberos5 ticket for the given service
3260 */
3261 int ads_krb5_cli_get_ticket(TALLOC_CTX *mem_ctx,
3262                             const char *principal,
3263                             time_t time_offset,
3264                             DATA_BLOB *ticket,
3265                             DATA_BLOB *session_key_krb5,
3266                             uint32_t extra_ap_opts, const char *ccname,
3267                             time_t *tgs_expire,
3268                             const char *impersonate_princ_s)
3269 {
3270         krb5_error_code retval;
3271         krb5_data packet;
3272         krb5_context context = NULL;
3273         krb5_ccache ccdef = NULL;
3274         krb5_auth_context auth_context = NULL;
3275         krb5_enctype enc_types[] = {
3276 #ifdef HAVE_ENCTYPE_AES256_CTS_HMAC_SHA1_96
3277                 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
3278 #endif
3279 #ifdef HAVE_ENCTYPE_AES128_CTS_HMAC_SHA1_96
3280                 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
3281 #endif
3282                 ENCTYPE_ARCFOUR_HMAC,
3283                 ENCTYPE_DES_CBC_MD5,
3284                 ENCTYPE_DES_CBC_CRC,
3285                 ENCTYPE_NULL};
3286         bool ok;
3287
3288         initialize_krb5_error_table();
3289         retval = krb5_init_context(&context);
3290         if (retval != 0) {
3291                 DBG_WARNING("krb5_init_context failed (%s)\n",
3292                             error_message(retval));
3293                 goto failed;
3294         }
3295
3296         if (time_offset != 0) {
3297                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
3298         }
3299
3300         retval = krb5_cc_resolve(context,
3301                                  ccname ? ccname : krb5_cc_default_name(context),
3302                                  &ccdef);
3303         if (retval != 0) {
3304                 DBG_WARNING("krb5_cc_default failed (%s)\n",
3305                             error_message(retval));
3306                 goto failed;
3307         }
3308
3309         retval = krb5_set_default_tgs_ktypes(context, enc_types);
3310         if (retval != 0) {
3311                 DBG_WARNING("krb5_set_default_tgs_ktypes failed (%s)\n",
3312                             error_message(retval));
3313                 goto failed;
3314         }
3315
3316         retval = ads_krb5_mk_req(context,
3317                                  &auth_context,
3318                                  AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
3319                                  principal,
3320                                  ccdef,
3321                                  &packet,
3322                                  tgs_expire,
3323                                  impersonate_princ_s);
3324         if (retval != 0) {
3325                 goto failed;
3326         }
3327
3328         ok = smb_krb5_get_smb_session_key(mem_ctx,
3329                                           context,
3330                                           auth_context,
3331                                           session_key_krb5,
3332                                           false);
3333         if (!ok) {
3334                 retval = ENOMEM;
3335                 goto failed;
3336         }
3337
3338         *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
3339
3340         smb_krb5_free_data_contents(context, &packet);
3341
3342 failed:
3343
3344         if (context) {
3345                 if (ccdef) {
3346                         krb5_cc_close(context, ccdef);
3347                 }
3348                 if (auth_context) {
3349                         krb5_auth_con_free(context, auth_context);
3350                 }
3351                 krb5_free_context(context);
3352         }
3353
3354         return retval;
3355 }
3356
3357 #else /* HAVE_KRB5 */
3358 /* This saves a few linking headaches */
3359 int ads_krb5_cli_get_ticket(TALLOC_CTX *mem_ctx,
3360                             const char *principal,
3361                             time_t time_offset,
3362                             DATA_BLOB *ticket,
3363                             DATA_BLOB *session_key_krb5,
3364                             uint32_t extra_ap_opts, const char *ccname,
3365                             time_t *tgs_expire,
3366                             const char *impersonate_princ_s)
3367 {
3368          DEBUG(0,("NO KERBEROS SUPPORT\n"));
3369          return 1;
3370 }
3371
3372 #endif /* HAVE_KRB5 */