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s3: shortcut uid_to_sid when "ldapsam:trusted = yes"
[Samba.git] / source3 / libsmb / clikrb5.c
blob3da64d60c2f3704cbe029298da82363ea5f2fc7b
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 #define KRB5_PRIVATE 1 /* this file uses PRIVATE interfaces! */
24 #define KRB5_DEPRECATED 1 /* this file uses DEPRECATED interfaces! */
25
26 #include "includes.h"
27
28 #ifdef HAVE_KRB5
29
30 #define GSSAPI_CHECKSUM 0x8003 /* Checksum type value for Kerberos */
31 #define GSSAPI_BNDLENGTH 16 /* Bind Length (rfc-1964 pg.3) */
32 #define GSSAPI_CHECKSUM_SIZE (12+GSSAPI_BNDLENGTH)
33
34 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_FWD_TGT_CREDS) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY)
35 static krb5_error_code ads_krb5_get_fwd_ticket( krb5_context context,
36 krb5_auth_context *auth_context,
37 krb5_creds *credsp,
38 krb5_ccache ccache,
39 krb5_data *authenticator);
40 #endif
41
42 /**************************************************************
43 Wrappers around kerberos string functions that convert from
44 utf8 -> unix charset and vica versa.
45 **************************************************************/
46
47 /**************************************************************
48 krb5_parse_name that takes a UNIX charset.
49 **************************************************************/
50
51 krb5_error_code smb_krb5_parse_name(krb5_context context,
52 const char *name, /* in unix charset */
53 krb5_principal *principal)
54 {
55 krb5_error_code ret;
56 char *utf8_name;
57 size_t converted_size;
58
59 if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
60 return ENOMEM;
61 }
62
63 ret = krb5_parse_name(context, utf8_name, principal);
64 TALLOC_FREE(utf8_name);
65 return ret;
66 }
67
68 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
69 /**************************************************************
70 krb5_parse_name_norealm that takes a UNIX charset.
71 **************************************************************/
72
73 static krb5_error_code smb_krb5_parse_name_norealm_conv(krb5_context context,
74 const char *name, /* in unix charset */
75 krb5_principal *principal)
76 {
77 krb5_error_code ret;
78 char *utf8_name;
79 size_t converted_size;
80
81 *principal = NULL;
82 if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
83 return ENOMEM;
84 }
85
86 ret = krb5_parse_name_norealm(context, utf8_name, principal);
87 TALLOC_FREE(utf8_name);
88 return ret;
89 }
90 #endif
91
92 /**************************************************************
93 krb5_parse_name that returns a UNIX charset name. Must
94 be freed with talloc_free() call.
95 **************************************************************/
96
97 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
98 krb5_context context,
99 krb5_const_principal principal,
100 char **unix_name)
101 {
102 krb5_error_code ret;
103 char *utf8_name;
104 size_t converted_size;
105
106 *unix_name = NULL;
107 ret = krb5_unparse_name(context, principal, &utf8_name);
108 if (ret) {
109 return ret;
110 }
111
112 if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
113 krb5_free_unparsed_name(context, utf8_name);
114 return ENOMEM;
115 }
116 krb5_free_unparsed_name(context, utf8_name);
117 return 0;
118 }
119
120 #ifndef HAVE_KRB5_SET_REAL_TIME
121 /*
122 * This function is not in the Heimdal mainline.
123 */
124 krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds)
125 {
126 krb5_error_code ret;
127 int32_t sec, usec;
128
129 ret = krb5_us_timeofday(context, &sec, &usec);
130 if (ret)
131 return ret;
132
133 context->kdc_sec_offset = seconds - sec;
134 context->kdc_usec_offset = microseconds - usec;
135
136 return 0;
137 }
138 #endif
139
140 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
141
142 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
143
144 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
145 * to krb5_set_default_tgs_ktypes. See
146 * http://lists.samba.org/archive/samba-technical/2006-July/048271.html
147 *
148 * If the MIT libraries are not exporting internal symbols, we will end up in
149 * this branch, which is correct. Otherwise we will continue to use the
150 * internal symbol
151 */
152 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
153 {
154 return krb5_set_default_tgs_enctypes(ctx, enc);
155 }
156
157 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
158
159 /* Heimdal */
160 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
161 {
162 return krb5_set_default_in_tkt_etypes(ctx, enc);
163 }
164
165 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
166
167 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
168
169 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
170 /* HEIMDAL */
171 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
172 {
173 memset(pkaddr, '\0', sizeof(krb5_address));
174 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
175 if (paddr->ss_family == AF_INET6) {
176 pkaddr->addr_type = KRB5_ADDRESS_INET6;
177 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
178 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
179 return true;
180 }
181 #endif
182 if (paddr->ss_family == AF_INET) {
183 pkaddr->addr_type = KRB5_ADDRESS_INET;
184 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
185 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
186 return true;
187 }
188 return false;
189 }
190 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
191 /* MIT */
192 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
193 {
194 memset(pkaddr, '\0', sizeof(krb5_address));
195 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
196 if (paddr->ss_family == AF_INET6) {
197 pkaddr->addrtype = ADDRTYPE_INET6;
198 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
199 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
200 return true;
201 }
202 #endif
203 if (paddr->ss_family == AF_INET) {
204 pkaddr->addrtype = ADDRTYPE_INET;
205 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
206 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
207 return true;
208 }
209 return false;
210 }
211 #else
212 #error UNKNOWN_ADDRTYPE
213 #endif
214
215 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY) && defined(HAVE_KRB5_ENCRYPT_BLOCK)
216 static int create_kerberos_key_from_string_direct(krb5_context context,
217 krb5_principal host_princ,
218 krb5_data *password,
219 krb5_keyblock *key,
220 krb5_enctype enctype)
221 {
222 int ret = 0;
223 krb5_data salt;
224 krb5_encrypt_block eblock;
225
226 ret = krb5_principal2salt(context, host_princ, &salt);
227 if (ret) {
228 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
229 return ret;
230 }
231 krb5_use_enctype(context, &eblock, enctype);
232 ret = krb5_string_to_key(context, &eblock, key, password, &salt);
233 SAFE_FREE(salt.data);
234
235 return ret;
236 }
237 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
238 static int create_kerberos_key_from_string_direct(krb5_context context,
239 krb5_principal host_princ,
240 krb5_data *password,
241 krb5_keyblock *key,
242 krb5_enctype enctype)
243 {
244 int ret;
245 krb5_salt salt;
246
247 ret = krb5_get_pw_salt(context, host_princ, &salt);
248 if (ret) {
249 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
250 return ret;
251 }
252
253 ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
254 krb5_free_salt(context, salt);
255
256 return ret;
257 }
258 #else
259 #error UNKNOWN_CREATE_KEY_FUNCTIONS
260 #endif
261
262 int create_kerberos_key_from_string(krb5_context context,
263 krb5_principal host_princ,
264 krb5_data *password,
265 krb5_keyblock *key,
266 krb5_enctype enctype,
267 bool no_salt)
268 {
269 krb5_principal salt_princ = NULL;
270 int ret;
271 /*
272 * Check if we've determined that the KDC is salting keys for this
273 * principal/enctype in a non-obvious way. If it is, try to match
274 * its behavior.
275 */
276 if (no_salt) {
277 KRB5_KEY_DATA(key) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
278 if (!KRB5_KEY_DATA(key)) {
279 return ENOMEM;
280 }
281 memcpy(KRB5_KEY_DATA(key), password->data, password->length);
282 KRB5_KEY_LENGTH(key) = password->length;
283 KRB5_KEY_TYPE(key) = enctype;
284 return 0;
285 }
286 salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype);
287 ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype);
288 if (salt_princ) {
289 krb5_free_principal(context, salt_princ);
290 }
291 return ret;
292 }
293
294 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
295 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
296 krb5_enctype **enctypes)
297 {
298 return krb5_get_permitted_enctypes(context, enctypes);
299 }
300 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
301 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
302 krb5_enctype **enctypes)
303 {
304 return krb5_get_default_in_tkt_etypes(context, enctypes);
305 }
306 #else
307 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
308 #endif
309
310 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
311 krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
312 krb5_auth_context auth_context,
313 krb5_keyblock *keyblock)
314 {
315 return krb5_auth_con_setkey(context, auth_context, keyblock);
316 }
317 #endif
318
319 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
320 DATA_BLOB *edata,
321 DATA_BLOB *edata_out)
322 {
323 DATA_BLOB edata_contents;
324 ASN1_DATA *data;
325 int edata_type;
326
327 if (!edata->length) {
328 return False;
329 }
330
331 data = asn1_init(mem_ctx);
332 if (data == NULL) {
333 return false;
334 }
335
336 asn1_load(data, *edata);
337 asn1_start_tag(data, ASN1_SEQUENCE(0));
338 asn1_start_tag(data, ASN1_CONTEXT(1));
339 asn1_read_Integer(data, &edata_type);
340
341 if (edata_type != KRB5_PADATA_PW_SALT) {
342 DEBUG(0,("edata is not of required type %d but of type %d\n",
343 KRB5_PADATA_PW_SALT, edata_type));
344 asn1_free(data);
345 return False;
346 }
347
348 asn1_start_tag(data, ASN1_CONTEXT(2));
349 asn1_read_OctetString(data, talloc_autofree_context(), &edata_contents);
350 asn1_end_tag(data);
351 asn1_end_tag(data);
352 asn1_end_tag(data);
353 asn1_free(data);
354
355 *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
356
357 data_blob_free(&edata_contents);
358
359 return True;
360 }
361
362
363 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
364 {
365 DATA_BLOB pac_contents;
366 ASN1_DATA *data;
367 int data_type;
368
369 if (!auth_data->length) {
370 return False;
371 }
372
373 data = asn1_init(mem_ctx);
374 if (data == NULL) {
375 return false;
376 }
377
378 asn1_load(data, *auth_data);
379 asn1_start_tag(data, ASN1_SEQUENCE(0));
380 asn1_start_tag(data, ASN1_SEQUENCE(0));
381 asn1_start_tag(data, ASN1_CONTEXT(0));
382 asn1_read_Integer(data, &data_type);
383
384 if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) {
385 DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type));
386 asn1_free(data);
387 return False;
388 }
389
390 asn1_end_tag(data);
391 asn1_start_tag(data, ASN1_CONTEXT(1));
392 asn1_read_OctetString(data, talloc_autofree_context(), &pac_contents);
393 asn1_end_tag(data);
394 asn1_end_tag(data);
395 asn1_end_tag(data);
396 asn1_free(data);
397
398 *unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length);
399
400 data_blob_free(&pac_contents);
401
402 return True;
403 }
404
405 bool get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt)
406 {
407 DATA_BLOB auth_data_wrapped;
408 bool got_auth_data_pac = False;
409 int i;
410
411 #if defined(HAVE_KRB5_TKT_ENC_PART2)
412 if (tkt->enc_part2 && tkt->enc_part2->authorization_data &&
413 tkt->enc_part2->authorization_data[0] &&
414 tkt->enc_part2->authorization_data[0]->length)
415 {
416 for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) {
417
418 if (tkt->enc_part2->authorization_data[i]->ad_type !=
419 KRB5_AUTHDATA_IF_RELEVANT) {
420 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
421 tkt->enc_part2->authorization_data[i]->ad_type));
422 continue;
423 }
424
425 auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents,
426 tkt->enc_part2->authorization_data[i]->length);
427
428 /* check if it is a PAC */
429 got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
430 data_blob_free(&auth_data_wrapped);
431
432 if (got_auth_data_pac) {
433 return true;
434 }
435 }
436
437 return got_auth_data_pac;
438 }
439
440 #else
441 if (tkt->ticket.authorization_data &&
442 tkt->ticket.authorization_data->len)
443 {
444 for (i = 0; i < tkt->ticket.authorization_data->len; i++) {
445
446 if (tkt->ticket.authorization_data->val[i].ad_type !=
447 KRB5_AUTHDATA_IF_RELEVANT) {
448 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
449 tkt->ticket.authorization_data->val[i].ad_type));
450 continue;
451 }
452
453 auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data,
454 tkt->ticket.authorization_data->val[i].ad_data.length);
455
456 /* check if it is a PAC */
457 got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
458 data_blob_free(&auth_data_wrapped);
459
460 if (got_auth_data_pac) {
461 return true;
462 }
463 }
464
465 return got_auth_data_pac;
466 }
467 #endif
468 return False;
469 }
470
471 krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
472 {
473 #if defined(HAVE_KRB5_TKT_ENC_PART2)
474 return tkt->enc_part2->client;
475 #else
476 return tkt->client;
477 #endif
478 }
479
480 #if !defined(HAVE_KRB5_LOCATE_KDC)
481
482 /* krb5_locate_kdc is an internal MIT symbol. MIT are not yet willing to commit
483 * to a public interface for this functionality, so we have to be able to live
484 * without it if the MIT libraries are hiding their internal symbols.
485 */
486
487 #if defined(KRB5_KRBHST_INIT)
488 /* Heimdal */
489 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters)
490 {
491 krb5_krbhst_handle hnd;
492 krb5_krbhst_info *hinfo;
493 krb5_error_code rc;
494 int num_kdcs, i;
495 struct sockaddr *sa;
496 struct addrinfo *ai;
497
498 *addr_pp = NULL;
499 *naddrs = 0;
500
501 rc = krb5_krbhst_init(ctx, realm->data, KRB5_KRBHST_KDC, &hnd);
502 if (rc) {
503 DEBUG(0, ("smb_krb5_locate_kdc: krb5_krbhst_init failed (%s)\n", error_message(rc)));
504 return rc;
505 }
506
507 for ( num_kdcs = 0; (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); num_kdcs++)
508 ;
509
510 krb5_krbhst_reset(ctx, hnd);
511
512 if (!num_kdcs) {
513 DEBUG(0, ("smb_krb5_locate_kdc: zero kdcs found !\n"));
514 krb5_krbhst_free(ctx, hnd);
515 return -1;
516 }
517
518 sa = SMB_MALLOC_ARRAY( struct sockaddr, num_kdcs );
519 if (!sa) {
520 DEBUG(0, ("smb_krb5_locate_kdc: malloc failed\n"));
521 krb5_krbhst_free(ctx, hnd);
522 naddrs = 0;
523 return -1;
524 }
525
526 memset(sa, '\0', sizeof(struct sockaddr) * num_kdcs );
527
528 for (i = 0; i < num_kdcs && (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); i++) {
529
530 #if defined(HAVE_KRB5_KRBHST_GET_ADDRINFO)
531 rc = krb5_krbhst_get_addrinfo(ctx, hinfo, &ai);
532 if (rc) {
533 DEBUG(0,("krb5_krbhst_get_addrinfo failed: %s\n", error_message(rc)));
534 continue;
535 }
536 #endif
537 if (hinfo->ai && hinfo->ai->ai_family == AF_INET)
538 memcpy(&sa[i], hinfo->ai->ai_addr, sizeof(struct sockaddr));
539 }
540
541 krb5_krbhst_free(ctx, hnd);
542
543 *naddrs = num_kdcs;
544 *addr_pp = sa;
545 return 0;
546 }
547
548 #else /* ! defined(KRB5_KRBHST_INIT) */
549
550 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
551 struct sockaddr **addr_pp, int *naddrs, int get_masters)
552 {
553 DEBUG(0, ("unable to explicitly locate the KDC on this platform\n"));
554 return KRB5_KDC_UNREACH;
555 }
556
557 #endif /* KRB5_KRBHST_INIT */
558
559 #else /* ! HAVE_KRB5_LOCATE_KDC */
560
561 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
562 struct sockaddr **addr_pp, int *naddrs, int get_masters)
563 {
564 return krb5_locate_kdc(ctx, realm, addr_pp, naddrs, get_masters);
565 }
566
567 #endif /* HAVE_KRB5_LOCATE_KDC */
568
569 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
570 void krb5_free_unparsed_name(krb5_context context, char *val)
571 {
572 SAFE_FREE(val);
573 }
574 #endif
575
576 void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
577 {
578 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
579 if (pdata->data) {
580 krb5_free_data_contents(context, pdata);
581 }
582 #else
583 SAFE_FREE(pdata->data);
584 #endif
585 }
586
587 void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype)
588 {
589 #if defined(HAVE_KRB5_KEYBLOCK_IN_CREDS)
590 KRB5_KEY_TYPE((&pcreds->keyblock)) = enctype;
591 #elif defined(HAVE_KRB5_SESSION_IN_CREDS)
592 KRB5_KEY_TYPE((&pcreds->session)) = enctype;
593 #else
594 #error UNKNOWN_KEYBLOCK_MEMBER_IN_KRB5_CREDS_STRUCT
595 #endif
596 }
597
598 bool kerberos_compatible_enctypes(krb5_context context,
599 krb5_enctype enctype1,
600 krb5_enctype enctype2)
601 {
602 #if defined(HAVE_KRB5_C_ENCTYPE_COMPARE)
603 krb5_boolean similar = 0;
604
605 krb5_c_enctype_compare(context, enctype1, enctype2, &similar);
606 return similar ? True : False;
607 #elif defined(HAVE_KRB5_ENCTYPES_COMPATIBLE_KEYS)
608 return krb5_enctypes_compatible_keys(context, enctype1, enctype2) ? True : False;
609 #endif
610 }
611
612 static bool ads_cleanup_expired_creds(krb5_context context,
613 krb5_ccache ccache,
614 krb5_creds *credsp)
615 {
616 krb5_error_code retval;
617 const char *cc_type = krb5_cc_get_type(context, ccache);
618
619 DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
620 cc_type, krb5_cc_get_name(context, ccache),
621 http_timestring(talloc_tos(), credsp->times.endtime)));
622
623 /* we will probably need new tickets if the current ones
624 will expire within 10 seconds.
625 */
626 if (credsp->times.endtime >= (time(NULL) + 10))
627 return False;
628
629 /* heimdal won't remove creds from a file ccache, and
630 perhaps we shouldn't anyway, since internally we
631 use memory ccaches, and a FILE one probably means that
632 we're using creds obtained outside of our exectuable
633 */
634 if (strequal(cc_type, "FILE")) {
635 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
636 return False;
637 }
638
639 retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
640 if (retval) {
641 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
642 error_message(retval)));
643 /* If we have an error in this, we want to display it,
644 but continue as though we deleted it */
645 }
646 return True;
647 }
648
649 /*
650 we can't use krb5_mk_req because w2k wants the service to be in a particular format
651 */
652 static krb5_error_code ads_krb5_mk_req(krb5_context context,
653 krb5_auth_context *auth_context,
654 const krb5_flags ap_req_options,
655 const char *principal,
656 krb5_ccache ccache,
657 krb5_data *outbuf,
658 time_t *expire_time,
659 const char *impersonate_princ_s)
660 {
661 krb5_error_code retval;
662 krb5_principal server;
663 krb5_principal impersonate_princ = NULL;
664 krb5_creds * credsp;
665 krb5_creds creds;
666 krb5_data in_data;
667 bool creds_ready = False;
668 int i = 0, maxtries = 3;
669
670 ZERO_STRUCT(in_data);
671
672 retval = smb_krb5_parse_name(context, principal, &server);
673 if (retval) {
674 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
675 return retval;
676 }
677
678 if (impersonate_princ_s) {
679 retval = smb_krb5_parse_name(context, impersonate_princ_s,
680 &impersonate_princ);
681 if (retval) {
682 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
683 goto cleanup_princ;
684 }
685 }
686
687 /* obtain ticket & session key */
688 ZERO_STRUCT(creds);
689 if ((retval = krb5_copy_principal(context, server, &creds.server))) {
690 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
691 error_message(retval)));
692 goto cleanup_princ;
693 }
694
695 if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
696 /* This can commonly fail on smbd startup with no ticket in the cache.
697 * Report at higher level than 1. */
698 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
699 error_message(retval)));
700 goto cleanup_creds;
701 }
702
703 while (!creds_ready && (i < maxtries)) {
704
705 if ((retval = smb_krb5_get_credentials(context, ccache,
706 creds.client,
707 creds.server,
708 impersonate_princ,
709 &credsp))) {
710 DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
711 principal, error_message(retval)));
712 goto cleanup_creds;
713 }
714
715 /* cope with ticket being in the future due to clock skew */
716 if ((unsigned)credsp->times.starttime > time(NULL)) {
717 time_t t = time(NULL);
718 int time_offset =(int)((unsigned)credsp->times.starttime-t);
719 DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
720 krb5_set_real_time(context, t + time_offset + 1, 0);
721 }
722
723 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
724 creds_ready = True;
725 }
726
727 i++;
728 }
729
730 DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
731 principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
732 http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
733 (unsigned)credsp->times.endtime));
734
735 if (expire_time) {
736 *expire_time = (time_t)credsp->times.endtime;
737 }
738
739 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_FWD_TGT_CREDS) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY)
740 if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
741 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
742 as part of the kerberos exchange. */
743
744 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n") );
745
746 if( *auth_context == NULL ) {
747 /* Allocate if it has not yet been allocated. */
748 retval = krb5_auth_con_init( context, auth_context );
749 if (retval) {
750 DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_init failed (%s)\n",
751 error_message(retval)));
752 goto cleanup_creds;
753 }
754 }
755
756 retval = krb5_auth_con_setuseruserkey( context, *auth_context, &credsp->keyblock );
757 if (retval) {
758 DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_setuseruserkey failed (%s)\n",
759 error_message(retval)));
760 goto cleanup_creds;
761 }
762
763 /* Must use a subkey for forwarded tickets. */
764 retval = krb5_auth_con_setflags( context, *auth_context, KRB5_AUTH_CONTEXT_USE_SUBKEY);
765 if (retval) {
766 DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_setflags failed (%s)\n",
767 error_message(retval)));
768 goto cleanup_creds;
769 }
770
771 retval = ads_krb5_get_fwd_ticket( context,
772 auth_context,
773 credsp,
774 ccache,
775 &in_data );
776 if (retval) {
777 DEBUG( 3, ("ads_krb5_get_fwd_ticket failed (%s)\n",
778 error_message( retval ) ) );
779
780 /*
781 * This is not fatal. Delete the *auth_context and continue
782 * with krb5_mk_req_extended to get a non-forwardable ticket.
783 */
784
785 if (in_data.data) {
786 free( in_data.data );
787 in_data.data = NULL;
788 in_data.length = 0;
789 }
790 krb5_auth_con_free(context, *auth_context);
791 *auth_context = NULL;
792 }
793 }
794 #endif
795
796 retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
797 &in_data, credsp, outbuf);
798 if (retval) {
799 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
800 error_message(retval)));
801 }
802
803 if (in_data.data) {
804 free( in_data.data );
805 in_data.length = 0;
806 }
807
808 krb5_free_creds(context, credsp);
809
810 cleanup_creds:
811 krb5_free_cred_contents(context, &creds);
812
813 cleanup_princ:
814 krb5_free_principal(context, server);
815 if (impersonate_princ) {
816 krb5_free_principal(context, impersonate_princ);
817 }
818
819 return retval;
820 }
821
822 /*
823 get a kerberos5 ticket for the given service
824 */
825 int cli_krb5_get_ticket(const char *principal, time_t time_offset,
826 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
827 uint32 extra_ap_opts, const char *ccname,
828 time_t *tgs_expire,
829 const char *impersonate_princ_s)
830
831 {
832 krb5_error_code retval;
833 krb5_data packet;
834 krb5_context context = NULL;
835 krb5_ccache ccdef = NULL;
836 krb5_auth_context auth_context = NULL;
837 krb5_enctype enc_types[] = {
838 #ifdef ENCTYPE_ARCFOUR_HMAC
839 ENCTYPE_ARCFOUR_HMAC,
840 #endif
841 ENCTYPE_DES_CBC_MD5,
842 ENCTYPE_DES_CBC_CRC,
843 ENCTYPE_NULL};
844
845 initialize_krb5_error_table();
846 retval = krb5_init_context(&context);
847 if (retval) {
848 DEBUG(1,("cli_krb5_get_ticket: krb5_init_context failed (%s)\n",
849 error_message(retval)));
850 goto failed;
851 }
852
853 if (time_offset != 0) {
854 krb5_set_real_time(context, time(NULL) + time_offset, 0);
855 }
856
857 if ((retval = krb5_cc_resolve(context, ccname ?
858 ccname : krb5_cc_default_name(context), &ccdef))) {
859 DEBUG(1,("cli_krb5_get_ticket: krb5_cc_default failed (%s)\n",
860 error_message(retval)));
861 goto failed;
862 }
863
864 if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
865 DEBUG(1,("cli_krb5_get_ticket: krb5_set_default_tgs_ktypes failed (%s)\n",
866 error_message(retval)));
867 goto failed;
868 }
869
870 if ((retval = ads_krb5_mk_req(context,
871 &auth_context,
872 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
873 principal,
874 ccdef, &packet,
875 tgs_expire,
876 impersonate_princ_s))) {
877 goto failed;
878 }
879
880 get_krb5_smb_session_key(context, auth_context, session_key_krb5, False);
881
882 *ticket = data_blob(packet.data, packet.length);
883
884 kerberos_free_data_contents(context, &packet);
885
886 failed:
887
888 if ( context ) {
889 if (ccdef)
890 krb5_cc_close(context, ccdef);
891 if (auth_context)
892 krb5_auth_con_free(context, auth_context);
893 krb5_free_context(context);
894 }
895
896 return retval;
897 }
898
899 bool get_krb5_smb_session_key(krb5_context context, krb5_auth_context auth_context, DATA_BLOB *session_key, bool remote)
900 {
901 krb5_keyblock *skey = NULL;
902 krb5_error_code err = 0;
903 bool ret = false;
904
905 if (remote) {
906 err = krb5_auth_con_getremotesubkey(context, auth_context, &skey);
907 } else {
908 err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey);
909 }
910
911 if (err || skey == NULL) {
912 DEBUG(10, ("KRB5 error getting session key %d\n", err));
913 goto done;
914 }
915
916 DEBUG(10, ("Got KRB5 session key of length %d\n", (int)KRB5_KEY_LENGTH(skey)));
917 *session_key = data_blob(KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
918 dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
919
920 ret = true;
921
922 done:
923 if (skey) {
924 krb5_free_keyblock(context, skey);
925 }
926
927 return ret;
928 }
929
930
931 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
932 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
933
934 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
935 {
936 static krb5_data kdata;
937
938 kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
939 kdata.length = strlen((const char *)kdata.data);
940 return &kdata;
941 }
942 #endif
943
944 krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
945 {
946 /* Try krb5_free_keytab_entry_contents first, since
947 * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
948 * krb5_kt_free_entry but only has a prototype for the first, while the
949 * second is considered private.
950 */
951 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
952 return krb5_free_keytab_entry_contents(context, kt_entry);
953 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
954 return krb5_kt_free_entry(context, kt_entry);
955 #else
956 #error UNKNOWN_KT_FREE_FUNCTION
957 #endif
958 }
959
960 void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
961 struct PAC_SIGNATURE_DATA *sig)
962 {
963 #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
964 cksum->cksumtype = (krb5_cksumtype)sig->type;
965 cksum->checksum.length = sig->signature.length;
966 cksum->checksum.data = sig->signature.data;
967 #else
968 cksum->checksum_type = (krb5_cksumtype)sig->type;
969 cksum->length = sig->signature.length;
970 cksum->contents = sig->signature.data;
971 #endif
972 }
973
974 krb5_error_code smb_krb5_verify_checksum(krb5_context context,
975 const krb5_keyblock *keyblock,
976 krb5_keyusage usage,
977 krb5_checksum *cksum,
978 uint8 *data,
979 size_t length)
980 {
981 krb5_error_code ret;
982
983 /* verify the checksum */
984
985 /* welcome to the wonderful world of samba's kerberos abstraction layer:
986 *
987 * function heimdal 0.6.1rc3 heimdal 0.7 MIT krb 1.4.2
988 * -----------------------------------------------------------------------------
989 * krb5_c_verify_checksum - works works
990 * krb5_verify_checksum works (6 args) works (6 args) broken (7 args)
991 */
992
993 #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
994 {
995 krb5_boolean checksum_valid = False;
996 krb5_data input;
997
998 input.data = (char *)data;
999 input.length = length;
1000
1001 ret = krb5_c_verify_checksum(context,
1002 keyblock,
1003 usage,
1004 &input,
1005 cksum,
1006 &checksum_valid);
1007 if (ret) {
1008 DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
1009 error_message(ret)));
1010 return ret;
1011 }
1012
1013 if (!checksum_valid)
1014 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1015 }
1016
1017 #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
1018
1019 /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
1020 * without enctype and it ignores any key_usage types - Guenther */
1021
1022 {
1023
1024 krb5_crypto crypto;
1025 ret = krb5_crypto_init(context,
1026 keyblock,
1027 0,
1028 &crypto);
1029 if (ret) {
1030 DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
1031 error_message(ret)));
1032 return ret;
1033 }
1034
1035 ret = krb5_verify_checksum(context,
1036 crypto,
1037 usage,
1038 data,
1039 length,
1040 cksum);
1041
1042 krb5_crypto_destroy(context, crypto);
1043 }
1044
1045 #else
1046 #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
1047 #endif
1048
1049 return ret;
1050 }
1051
1052 time_t get_authtime_from_tkt(krb5_ticket *tkt)
1053 {
1054 #if defined(HAVE_KRB5_TKT_ENC_PART2)
1055 return tkt->enc_part2->times.authtime;
1056 #else
1057 return tkt->ticket.authtime;
1058 #endif
1059 }
1060
1061 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1062 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
1063 {
1064 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
1065 if (ap_req->ticket->enc_part.kvno)
1066 return ap_req->ticket->enc_part.kvno;
1067 #else /* Heimdal */
1068 if (ap_req->ticket.enc_part.kvno)
1069 return *ap_req->ticket.enc_part.kvno;
1070 #endif
1071 return 0;
1072 }
1073
1074 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
1075 {
1076 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
1077 return ap_req->ticket.enc_part.etype;
1078 #else /* MIT */
1079 return ap_req->ticket->enc_part.enctype;
1080 #endif
1081 }
1082 #endif /* HAVE_KRB5_DECODE_AP_REQ */
1083
1084 static krb5_error_code
1085 get_key_from_keytab(krb5_context context,
1086 krb5_const_principal server,
1087 krb5_enctype enctype,
1088 krb5_kvno kvno,
1089 krb5_keyblock **out_key)
1090 {
1091 krb5_keytab_entry entry;
1092 krb5_error_code ret;
1093 krb5_keytab keytab;
1094 char *name = NULL;
1095 krb5_keyblock *keyp;
1096
1097 /* We have to open a new keytab handle here, as MIT does
1098 an implicit open/getnext/close on krb5_kt_get_entry. We
1099 may be in the middle of a keytab enumeration when this is
1100 called. JRA. */
1101
1102 ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1103 if (ret) {
1104 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1105 return ret;
1106 }
1107
1108 if ( DEBUGLEVEL >= 10 ) {
1109 if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) {
1110 DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1111 kvno, enctype, name));
1112 TALLOC_FREE(name);
1113 }
1114 }
1115
1116 ret = krb5_kt_get_entry(context,
1117 keytab,
1118 server,
1119 kvno,
1120 enctype,
1121 &entry);
1122
1123 if (ret) {
1124 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1125 goto out;
1126 }
1127
1128 keyp = KRB5_KT_KEY(&entry);
1129
1130 ret = krb5_copy_keyblock(context, keyp, out_key);
1131 if (ret) {
1132 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1133 goto out;
1134 }
1135
1136 smb_krb5_kt_free_entry(context, &entry);
1137
1138 out:
1139 krb5_kt_close(context, keytab);
1140 return ret;
1141 }
1142
1143 /* Prototypes */
1144
1145 krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1146 const krb5_data *inbuf,
1147 krb5_kvno *kvno,
1148 krb5_enctype *enctype)
1149 {
1150 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1151 {
1152 krb5_error_code ret;
1153 krb5_ap_req ap_req;
1154
1155 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1156 if (ret)
1157 return ret;
1158
1159 *kvno = get_kvno_from_ap_req(&ap_req);
1160 *enctype = get_enctype_from_ap_req(&ap_req);
1161
1162 free_AP_REQ(&ap_req);
1163 return 0;
1164 }
1165 #endif
1166
1167 /* Possibly not an appropriate error code. */
1168 return KRB5KDC_ERR_BADOPTION;
1169 }
1170
1171 krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1172 krb5_auth_context *auth_context,
1173 const krb5_data *inbuf,
1174 krb5_const_principal server,
1175 krb5_keytab keytab,
1176 krb5_flags *ap_req_options,
1177 krb5_ticket **ticket,
1178 krb5_keyblock **keyblock)
1179 {
1180 krb5_error_code ret;
1181 krb5_kvno kvno;
1182 krb5_enctype enctype;
1183 krb5_keyblock *local_keyblock;
1184
1185 ret = krb5_rd_req(context,
1186 auth_context,
1187 inbuf,
1188 server,
1189 keytab,
1190 ap_req_options,
1191 ticket);
1192 if (ret) {
1193 return ret;
1194 }
1195
1196 #ifdef KRB5_TICKET_HAS_KEYINFO
1197 enctype = (*ticket)->enc_part.enctype;
1198 kvno = (*ticket)->enc_part.kvno;
1199 #else
1200 ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1201 if (ret) {
1202 return ret;
1203 }
1204 #endif
1205
1206 ret = get_key_from_keytab(context,
1207 server,
1208 enctype,
1209 kvno,
1210 &local_keyblock);
1211 if (ret) {
1212 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1213 goto out;
1214 }
1215
1216 out:
1217 if (ret && local_keyblock != NULL) {
1218 krb5_free_keyblock(context, local_keyblock);
1219 } else {
1220 *keyblock = local_keyblock;
1221 }
1222
1223 return ret;
1224 }
1225
1226 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1227 const char *name,
1228 krb5_principal *principal)
1229 {
1230 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1231 return smb_krb5_parse_name_norealm_conv(context, name, principal);
1232 #endif
1233
1234 /* we are cheating here because parse_name will in fact set the realm.
1235 * We don't care as the only caller of smb_krb5_parse_name_norealm
1236 * ignores the realm anyway when calling
1237 * smb_krb5_principal_compare_any_realm later - Guenther */
1238
1239 return smb_krb5_parse_name(context, name, principal);
1240 }
1241
1242 bool smb_krb5_principal_compare_any_realm(krb5_context context,
1243 krb5_const_principal princ1,
1244 krb5_const_principal princ2)
1245 {
1246 #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1247
1248 return krb5_principal_compare_any_realm(context, princ1, princ2);
1249
1250 /* krb5_princ_size is a macro in MIT */
1251 #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1252
1253 int i, len1, len2;
1254 const krb5_data *p1, *p2;
1255
1256 len1 = krb5_princ_size(context, princ1);
1257 len2 = krb5_princ_size(context, princ2);
1258
1259 if (len1 != len2)
1260 return False;
1261
1262 for (i = 0; i < len1; i++) {
1263
1264 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1265 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1266
1267 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1268 return False;
1269 }
1270
1271 return True;
1272 #else
1273 #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1274 #endif
1275 }
1276
1277 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, /* FILE:/tmp/krb5cc_0 */
1278 const char *client_string, /* gd@BER.SUSE.DE */
1279 const char *service_string, /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1280 time_t *expire_time)
1281 {
1282 krb5_error_code ret;
1283 krb5_context context = NULL;
1284 krb5_ccache ccache = NULL;
1285 krb5_principal client = NULL;
1286 krb5_creds creds, creds_in, *creds_out = NULL;
1287
1288 ZERO_STRUCT(creds);
1289 ZERO_STRUCT(creds_in);
1290
1291 initialize_krb5_error_table();
1292 ret = krb5_init_context(&context);
1293 if (ret) {
1294 goto done;
1295 }
1296
1297 if (!ccache_string) {
1298 ccache_string = krb5_cc_default_name(context);
1299 }
1300
1301 if (!ccache_string) {
1302 ret = EINVAL;
1303 goto done;
1304 }
1305
1306 DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1307
1308 /* FIXME: we should not fall back to defaults */
1309 ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1310 if (ret) {
1311 goto done;
1312 }
1313
1314 if (client_string) {
1315 ret = smb_krb5_parse_name(context, client_string, &client);
1316 if (ret) {
1317 goto done;
1318 }
1319 } else {
1320 ret = krb5_cc_get_principal(context, ccache, &client);
1321 if (ret) {
1322 goto done;
1323 }
1324 }
1325
1326 #ifdef HAVE_KRB5_GET_RENEWED_CREDS /* MIT */
1327 {
1328 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1329 if (ret) {
1330 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1331 goto done;
1332 }
1333 }
1334 #elif defined(HAVE_KRB5_GET_KDC_CRED) /* Heimdal */
1335 {
1336 krb5_kdc_flags flags;
1337 krb5_realm *client_realm = NULL;
1338
1339 ret = krb5_copy_principal(context, client, &creds_in.client);
1340 if (ret) {
1341 goto done;
1342 }
1343
1344 if (service_string) {
1345 ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1346 if (ret) {
1347 goto done;
1348 }
1349 } else {
1350 /* build tgt service by default */
1351 client_realm = krb5_princ_realm(context, creds_in.client);
1352 if (!client_realm) {
1353 ret = ENOMEM;
1354 goto done;
1355 }
1356 ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1357 if (ret) {
1358 goto done;
1359 }
1360 }
1361
1362 flags.i = 0;
1363 flags.b.renewable = flags.b.renew = True;
1364
1365 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1366 if (ret) {
1367 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1368 goto done;
1369 }
1370
1371 creds = *creds_out;
1372 }
1373 #else
1374 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1375 #endif
1376
1377 /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1378 ret = krb5_cc_initialize(context, ccache, client);
1379 if (ret) {
1380 goto done;
1381 }
1382
1383 ret = krb5_cc_store_cred(context, ccache, &creds);
1384
1385 if (expire_time) {
1386 *expire_time = (time_t) creds.times.endtime;
1387 }
1388
1389 done:
1390 krb5_free_cred_contents(context, &creds_in);
1391
1392 if (creds_out) {
1393 krb5_free_creds(context, creds_out);
1394 } else {
1395 krb5_free_cred_contents(context, &creds);
1396 }
1397
1398 if (client) {
1399 krb5_free_principal(context, client);
1400 }
1401 if (ccache) {
1402 krb5_cc_close(context, ccache);
1403 }
1404 if (context) {
1405 krb5_free_context(context);
1406 }
1407
1408 return ret;
1409 }
1410
1411 krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1412 {
1413 krb5_error_code ret = 0;
1414 if (addr == NULL) {
1415 return ret;
1416 }
1417 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1418 krb5_free_addresses(context, addr->addrs);
1419 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1420 ret = krb5_free_addresses(context, addr->addrs);
1421 SAFE_FREE(addr->addrs);
1422 #endif
1423 SAFE_FREE(addr);
1424 addr = NULL;
1425 return ret;
1426 }
1427
1428 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1429 {
1430 krb5_error_code ret = 0;
1431 nstring buf;
1432 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1433 krb5_address **addrs = NULL;
1434 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1435 krb5_addresses *addrs = NULL;
1436 #endif
1437
1438 *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1439 if (*kerb_addr == NULL) {
1440 return ENOMEM;
1441 }
1442
1443 put_name(buf, global_myname(), ' ', 0x20);
1444
1445 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1446 {
1447 int num_addr = 2;
1448
1449 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1450 if (addrs == NULL) {
1451 SAFE_FREE(*kerb_addr);
1452 return ENOMEM;
1453 }
1454
1455 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1456
1457 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1458 if (addrs[0] == NULL) {
1459 SAFE_FREE(addrs);
1460 SAFE_FREE(*kerb_addr);
1461 return ENOMEM;
1462 }
1463
1464 addrs[0]->magic = KV5M_ADDRESS;
1465 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1466 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1467 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1468 if (addrs[0]->contents == NULL) {
1469 SAFE_FREE(addrs[0]);
1470 SAFE_FREE(addrs);
1471 SAFE_FREE(*kerb_addr);
1472 return ENOMEM;
1473 }
1474
1475 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1476
1477 addrs[1] = NULL;
1478 }
1479 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1480 {
1481 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1482 if (addrs == NULL) {
1483 SAFE_FREE(*kerb_addr);
1484 return ENOMEM;
1485 }
1486
1487 memset(addrs, 0, sizeof(krb5_addresses));
1488
1489 addrs->len = 1;
1490 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1491 if (addrs->val == NULL) {
1492 SAFE_FREE(addrs);
1493 SAFE_FREE(kerb_addr);
1494 return ENOMEM;
1495 }
1496
1497 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1498 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1499 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1500 if (addrs->val[0].address.data == NULL) {
1501 SAFE_FREE(addrs->val);
1502 SAFE_FREE(addrs);
1503 SAFE_FREE(*kerb_addr);
1504 return ENOMEM;
1505 }
1506
1507 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1508 }
1509 #else
1510 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1511 #endif
1512 (*kerb_addr)->addrs = addrs;
1513
1514 return ret;
1515 }
1516
1517 void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1518 {
1519 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1520 krb5_free_error_contents(context, krberror);
1521 #else /* MIT */
1522 krb5_free_error(context, krberror);
1523 #endif
1524 }
1525
1526 krb5_error_code handle_krberror_packet(krb5_context context,
1527 krb5_data *packet)
1528 {
1529 krb5_error_code ret;
1530 bool got_error_code = False;
1531
1532 DEBUG(10,("handle_krberror_packet: got error packet\n"));
1533
1534 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1535 {
1536 krb5_error krberror;
1537
1538 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1539 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1540 error_message(ret)));
1541 return ret;
1542 }
1543
1544 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1545 ret = (krb5_error_code) krberror.error_code;
1546 got_error_code = True;
1547 }
1548
1549 smb_krb5_free_error(context, &krberror);
1550 }
1551 #else /* MIT */
1552 {
1553 krb5_error *krberror;
1554
1555 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1556 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1557 error_message(ret)));
1558 return ret;
1559 }
1560
1561 if (krberror->e_data.data == NULL) {
1562 #if defined(ERROR_TABLE_BASE_krb5)
1563 ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1564 #else
1565 ret = (krb5_error_code)krberror->error;
1566 #endif
1567 got_error_code = True;
1568 }
1569 smb_krb5_free_error(context, krberror);
1570 }
1571 #endif
1572 if (got_error_code) {
1573 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1574 error_message(ret), ret));
1575 }
1576 return ret;
1577 }
1578
1579 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1580 krb5_get_init_creds_opt **opt)
1581 {
1582 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1583 /* Heimdal or modern MIT version */
1584 return krb5_get_init_creds_opt_alloc(context, opt);
1585 #else
1586 /* Historical MIT version */
1587 krb5_get_init_creds_opt *my_opt;
1588
1589 *opt = NULL;
1590
1591 if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1592 return ENOMEM;
1593 }
1594
1595 krb5_get_init_creds_opt_init(my_opt);
1596
1597 *opt = my_opt;
1598 return 0;
1599 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC */
1600 }
1601
1602 void smb_krb5_get_init_creds_opt_free(krb5_context context,
1603 krb5_get_init_creds_opt *opt)
1604 {
1605 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1606
1607 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1608 /* Modern MIT or Heimdal version */
1609 krb5_get_init_creds_opt_free(context, opt);
1610 #else
1611 /* Heimdal version */
1612 krb5_get_init_creds_opt_free(opt);
1613 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1614
1615 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1616 /* Historical MIT version */
1617 SAFE_FREE(opt);
1618 opt = NULL;
1619 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1620 }
1621
1622 krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1623 {
1624 return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1625 }
1626
1627
1628 /* caller needs to free etype_s */
1629 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1630 krb5_enctype enctype,
1631 char **etype_s)
1632 {
1633 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1634 return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1635 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1636 char buf[256];
1637 krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1638 if (ret) {
1639 return ret;
1640 }
1641 *etype_s = SMB_STRDUP(buf);
1642 if (!*etype_s) {
1643 return ENOMEM;
1644 }
1645 return ret;
1646 #else
1647 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1648 #endif
1649 }
1650
1651 krb5_error_code smb_krb5_mk_error(krb5_context context,
1652 krb5_error_code error_code,
1653 const krb5_principal server,
1654 krb5_data *reply)
1655 {
1656 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1657 /*
1658 * The MIT interface is *terrible*.
1659 * We have to construct this ourselves...
1660 */
1661 krb5_error e;
1662
1663 memset(&e, 0, sizeof(e));
1664 krb5_us_timeofday(context, &e.stime, &e.susec);
1665 e.server = server;
1666 #if defined(krb5_err_base)
1667 e.error = error_code - krb5_err_base;
1668 #elif defined(ERROR_TABLE_BASE_krb5)
1669 e.error = error_code - ERROR_TABLE_BASE_krb5;
1670 #else
1671 e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1672 #endif
1673
1674 return krb5_mk_error(context, &e, reply);
1675 #else /* Heimdal. */
1676 return krb5_mk_error(context,
1677 error_code,
1678 NULL,
1679 NULL, /* e_data */
1680 NULL,
1681 server,
1682 NULL,
1683 NULL,
1684 reply);
1685 #endif
1686 }
1687
1688 /**********************************************************************
1689 * Open a krb5 keytab with flags, handles readonly or readwrite access and
1690 * allows to process non-default keytab names.
1691 * @param context krb5_context
1692 * @param keytab_name_req string
1693 * @param write_access bool if writable keytab is required
1694 * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1695 * @return krb5_error_code
1696 **********************************************************************/
1697
1698 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1699 #ifndef MAX_KEYTAB_NAME_LEN
1700 #define MAX_KEYTAB_NAME_LEN 1100
1701 #endif
1702
1703 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1704 const char *keytab_name_req,
1705 bool write_access,
1706 krb5_keytab *keytab)
1707 {
1708 krb5_error_code ret = 0;
1709 TALLOC_CTX *mem_ctx;
1710 char keytab_string[MAX_KEYTAB_NAME_LEN];
1711 char *kt_str = NULL;
1712 bool found_valid_name = False;
1713 const char *pragma = "FILE";
1714 const char *tmp = NULL;
1715
1716 if (!write_access && !keytab_name_req) {
1717 /* caller just wants to read the default keytab readonly, so be it */
1718 return krb5_kt_default(context, keytab);
1719 }
1720
1721 mem_ctx = talloc_init("smb_krb5_open_keytab");
1722 if (!mem_ctx) {
1723 return ENOMEM;
1724 }
1725
1726 #ifdef HAVE_WRFILE_KEYTAB
1727 if (write_access) {
1728 pragma = "WRFILE";
1729 }
1730 #endif
1731
1732 if (keytab_name_req) {
1733
1734 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1735 ret = KRB5_CONFIG_NOTENUFSPACE;
1736 goto out;
1737 }
1738
1739 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1740 (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1741 tmp = keytab_name_req;
1742 goto resolve;
1743 }
1744
1745 if (keytab_name_req[0] != '/') {
1746 ret = KRB5_KT_BADNAME;
1747 goto out;
1748 }
1749
1750 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1751 if (!tmp) {
1752 ret = ENOMEM;
1753 goto out;
1754 }
1755
1756 goto resolve;
1757 }
1758
1759 /* we need to handle more complex keytab_strings, like:
1760 * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1761
1762 ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1763 if (ret) {
1764 goto out;
1765 }
1766
1767 DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1768
1769 tmp = talloc_strdup(mem_ctx, keytab_string);
1770 if (!tmp) {
1771 ret = ENOMEM;
1772 goto out;
1773 }
1774
1775 if (strncmp(tmp, "ANY:", 4) == 0) {
1776 tmp += 4;
1777 }
1778
1779 memset(&keytab_string, '\0', sizeof(keytab_string));
1780
1781 while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1782 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1783 found_valid_name = True;
1784 tmp = kt_str;
1785 tmp += 7;
1786 }
1787
1788 if (strncmp(kt_str, "FILE:", 5) == 0) {
1789 found_valid_name = True;
1790 tmp = kt_str;
1791 tmp += 5;
1792 }
1793
1794 if (tmp[0] == '/') {
1795 /* Treat as a FILE: keytab definition. */
1796 found_valid_name = true;
1797 }
1798
1799 if (found_valid_name) {
1800 if (tmp[0] != '/') {
1801 ret = KRB5_KT_BADNAME;
1802 goto out;
1803 }
1804
1805 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1806 if (!tmp) {
1807 ret = ENOMEM;
1808 goto out;
1809 }
1810 break;
1811 }
1812 }
1813
1814 if (!found_valid_name) {
1815 ret = KRB5_KT_UNKNOWN_TYPE;
1816 goto out;
1817 }
1818
1819 resolve:
1820 DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1821 ret = krb5_kt_resolve(context, tmp, keytab);
1822
1823 out:
1824 TALLOC_FREE(mem_ctx);
1825 return ret;
1826 }
1827
1828 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1829 krb5_context context,
1830 krb5_keytab keytab,
1831 const char **keytab_name)
1832 {
1833 char keytab_string[MAX_KEYTAB_NAME_LEN];
1834 krb5_error_code ret = 0;
1835
1836 ret = krb5_kt_get_name(context, keytab,
1837 keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1838 if (ret) {
1839 return ret;
1840 }
1841
1842 *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1843 if (!*keytab_name) {
1844 return ENOMEM;
1845 }
1846
1847 return ret;
1848 }
1849
1850 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_FWD_TGT_CREDS) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY)
1851 /**************************************************************
1852 Routine: ads_krb5_get_fwd_ticket
1853 Description:
1854 When a service ticket is flagged as trusted
1855 for delegation we should provide a forwardable
1856 ticket so that the remote host can act on our
1857 behalf. This is done by taking the 2nd forwardable
1858 TGT and storing it in the GSS-API authenticator
1859 "checksum". This routine will populate
1860 the krb5_data authenticator with this TGT.
1861 Parameters:
1862 krb5_context context: The kerberos context for this authentication.
1863 krb5_auth_context: The authentication context.
1864 krb5_creds *credsp: The ticket credentials (AS-REP).
1865 krb5_ccache ccache: The credentials cache.
1866 krb5_data &authenticator: The checksum field that will store the TGT, and
1867 authenticator.data must be freed by the caller.
1868
1869 Returns:
1870 krb5_error_code: 0 if no errors, otherwise set.
1871 **************************************************************/
1872
1873 static krb5_error_code ads_krb5_get_fwd_ticket( krb5_context context,
1874 krb5_auth_context *auth_context,
1875 krb5_creds *credsp,
1876 krb5_ccache ccache,
1877 krb5_data *authenticator)
1878 {
1879 krb5_data fwdData;
1880 krb5_error_code retval = 0;
1881 char *pChksum = NULL;
1882 char *p = NULL;
1883
1884 /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
1885 but still has the symbol */
1886 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
1887 krb5_error_code krb5_auth_con_set_req_cksumtype(
1888 krb5_context context,
1889 krb5_auth_context auth_context,
1890 krb5_cksumtype cksumtype);
1891 #endif
1892
1893 ZERO_STRUCT(fwdData);
1894 ZERO_STRUCTP(authenticator);
1895
1896 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
1897 *auth_context, /* Authentication context [in] */
1898 CONST_DISCARD(char *, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
1899 credsp->client, /* Client principal for the tgt [in] */
1900 credsp->server, /* Server principal for the tgt [in] */
1901 ccache, /* Credential cache to use for storage [in] */
1902 1, /* Turn on for "Forwardable ticket" [in] */
1903 &fwdData ); /* Resulting response [out] */
1904
1905
1906 if (retval) {
1907 DEBUG(1,("ads_krb5_get_fwd_ticket: krb5_fwd_tgt_creds failed (%s)\n",
1908 error_message(retval)));
1909 goto out;
1910 }
1911
1912 if ((unsigned int)GSSAPI_CHECKSUM_SIZE + (unsigned int)fwdData.length <
1913 (unsigned int)GSSAPI_CHECKSUM_SIZE) {
1914 retval = EINVAL;
1915 goto out;
1916 }
1917
1918 /* We're going to allocate a gssChecksum structure with a little
1919 extra data the length of the kerberos credentials length
1920 (APPLICATION 22) so that we can pack it on the end of the structure.
1921 */
1922
1923 pChksum = (char *)SMB_MALLOC(GSSAPI_CHECKSUM_SIZE + fwdData.length );
1924 if (!pChksum) {
1925 retval = ENOMEM;
1926 goto out;
1927 }
1928
1929 p = pChksum;
1930
1931 SIVAL(p, 0, GSSAPI_BNDLENGTH);
1932 p += 4;
1933
1934 /* Zero out the bindings fields */
1935 memset(p, '\0', GSSAPI_BNDLENGTH );
1936 p += GSSAPI_BNDLENGTH;
1937
1938 SIVAL(p, 0, GSS_C_DELEG_FLAG );
1939 p += 4;
1940 SSVAL(p, 0, 1 );
1941 p += 2;
1942 SSVAL(p, 0, fwdData.length );
1943 p += 2;
1944
1945 /* Migrate the kerberos KRB_CRED data to the checksum delegation */
1946 memcpy(p, fwdData.data, fwdData.length );
1947 p += fwdData.length;
1948
1949 /* We need to do this in order to allow our GSS-API */
1950 retval = krb5_auth_con_set_req_cksumtype( context, *auth_context, GSSAPI_CHECKSUM );
1951 if (retval) {
1952 goto out;
1953 }
1954
1955 /* We now have a service ticket, now turn it into an AP-REQ. */
1956 authenticator->length = fwdData.length + GSSAPI_CHECKSUM_SIZE;
1957
1958 /* Caller should call free() when they're done with this. */
1959 authenticator->data = (char *)pChksum;
1960
1961 out:
1962
1963 /* Remove that input data, we never needed it anyway. */
1964 if (fwdData.length > 0) {
1965 krb5_free_data_contents( context, &fwdData );
1966 }
1967
1968 return retval;
1969 }
1970 #endif
1971
1972 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1973 defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1974 defined(HAVE_KRB5_GET_CREDS)
1975 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1976 krb5_ccache ccache,
1977 krb5_principal me,
1978 krb5_principal server,
1979 krb5_principal impersonate_princ,
1980 krb5_creds **out_creds)
1981 {
1982 krb5_error_code ret;
1983 krb5_get_creds_opt opt;
1984
1985 ret = krb5_get_creds_opt_alloc(context, &opt);
1986 if (ret) {
1987 goto done;
1988 }
1989 krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1990
1991 if (impersonate_princ) {
1992 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1993 impersonate_princ);
1994 if (ret) {
1995 goto done;
1996 }
1997 }
1998
1999 ret = krb5_get_creds(context, opt, ccache, server, out_creds);
2000 if (ret) {
2001 goto done;
2002 }
2003
2004 done:
2005 if (opt) {
2006 krb5_get_creds_opt_free(context, opt);
2007 }
2008 return ret;
2009 }
2010 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
2011
2012 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
2013 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
2014 krb5_ccache ccache,
2015 krb5_principal me,
2016 krb5_principal server,
2017 krb5_principal impersonate_princ,
2018 krb5_creds **out_creds)
2019 {
2020 krb5_error_code ret;
2021 krb5_creds in_creds;
2022
2023 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
2024 krb5_error_code KRB5_CALLCONV
2025 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
2026 krb5_ccache ccache, krb5_creds *in_creds,
2027 krb5_data *subject_cert,
2028 krb5_creds **out_creds);
2029 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
2030
2031 ZERO_STRUCT(in_creds);
2032
2033 if (impersonate_princ) {
2034
2035 in_creds.server = me;
2036 in_creds.client = impersonate_princ;
2037
2038 ret = krb5_get_credentials_for_user(context,
2039 0, /* krb5_flags options */
2040 ccache,
2041 &in_creds,
2042 NULL, /* krb5_data *subject_cert */
2043 out_creds);
2044 } else {
2045 in_creds.client = me;
2046 in_creds.server = server;
2047
2048 ret = krb5_get_credentials(context, 0, ccache,
2049 &in_creds, out_creds);
2050 }
2051
2052 return ret;
2053 }
2054 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
2055
2056 /*
2057 * smb_krb5_get_credentials
2058 *
2059 * @brief Get krb5 credentials for a server
2060 *
2061 * @param[in] context An initialized krb5_context
2062 * @param[in] ccache An initialized krb5_ccache
2063 * @param[in] me The krb5_principal of the caller
2064 * @param[in] server The krb5_principal of the requested service
2065 * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
2066 * @param[out] out_creds The returned krb5_creds structure
2067 * @return krb5_error_code
2068 *
2069 */
2070 krb5_error_code smb_krb5_get_credentials(krb5_context context,
2071 krb5_ccache ccache,
2072 krb5_principal me,
2073 krb5_principal server,
2074 krb5_principal impersonate_princ,
2075 krb5_creds **out_creds)
2076 {
2077 krb5_error_code ret;
2078 krb5_creds *creds = NULL;
2079
2080 *out_creds = NULL;
2081
2082 if (impersonate_princ) {
2083 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
2084 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
2085 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
2086 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
2087 #else
2088 ret = ENOTSUP;
2089 #endif
2090 } else {
2091 krb5_creds in_creds;
2092
2093 ZERO_STRUCT(in_creds);
2094
2095 in_creds.client = me;
2096 in_creds.server = server;
2097
2098 ret = krb5_get_credentials(context, 0, ccache,
2099 &in_creds, &creds);
2100 }
2101 if (ret) {
2102 goto done;
2103 }
2104
2105 ret = krb5_cc_store_cred(context, ccache, creds);
2106 if (ret) {
2107 goto done;
2108 }
2109
2110 if (out_creds) {
2111 *out_creds = creds;
2112 }
2113
2114 done:
2115 if (creds && ret) {
2116 krb5_free_creds(context, creds);
2117 }
2118
2119 return ret;
2120 }
2121
2122 /*
2123 * smb_krb5_get_creds
2124 *
2125 * @brief Get krb5 credentials for a server
2126 *
2127 * @param[in] server_s The string name of the service
2128 * @param[in] time_offset The offset to the KDCs time in seconds (optional)
2129 * @param[in] cc The krb5 credential cache string name (optional)
2130 * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
2131 * @param[out] creds_p The returned krb5_creds structure
2132 * @return krb5_error_code
2133 *
2134 */
2135 krb5_error_code smb_krb5_get_creds(const char *server_s,
2136 time_t time_offset,
2137 const char *cc,
2138 const char *impersonate_princ_s,
2139 krb5_creds **creds_p)
2140 {
2141 krb5_error_code ret;
2142 krb5_context context = NULL;
2143 krb5_principal me = NULL;
2144 krb5_principal server = NULL;
2145 krb5_principal impersonate_princ = NULL;
2146 krb5_creds *creds = NULL;
2147 krb5_ccache ccache = NULL;
2148
2149 *creds_p = NULL;
2150
2151 initialize_krb5_error_table();
2152 ret = krb5_init_context(&context);
2153 if (ret) {
2154 goto done;
2155 }
2156
2157 if (time_offset != 0) {
2158 krb5_set_real_time(context, time(NULL) + time_offset, 0);
2159 }
2160
2161 ret = krb5_cc_resolve(context, cc ? cc :
2162 krb5_cc_default_name(context), &ccache);
2163 if (ret) {
2164 goto done;
2165 }
2166
2167 ret = krb5_cc_get_principal(context, ccache, &me);
2168 if (ret) {
2169 goto done;
2170 }
2171
2172 ret = smb_krb5_parse_name(context, server_s, &server);
2173 if (ret) {
2174 goto done;
2175 }
2176
2177 if (impersonate_princ_s) {
2178 ret = smb_krb5_parse_name(context, impersonate_princ_s,
2179 &impersonate_princ);
2180 if (ret) {
2181 goto done;
2182 }
2183 }
2184
2185 ret = smb_krb5_get_credentials(context, ccache,
2186 me, server, impersonate_princ,
2187 &creds);
2188 if (ret) {
2189 goto done;
2190 }
2191
2192 ret = krb5_cc_store_cred(context, ccache, creds);
2193 if (ret) {
2194 goto done;
2195 }
2196
2197 if (creds_p) {
2198 *creds_p = creds;
2199 }
2200
2201 DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
2202 server_s));
2203
2204 if (impersonate_princ_s) {
2205 char *client = NULL;
2206
2207 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
2208 if (ret) {
2209 goto done;
2210 }
2211 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
2212 client));
2213 TALLOC_FREE(client);
2214 }
2215
2216 done:
2217 if (!context) {
2218 return ret;
2219 }
2220
2221 if (creds && ret) {
2222 krb5_free_creds(context, creds);
2223 }
2224 if (server) {
2225 krb5_free_principal(context, server);
2226 }
2227 if (me) {
2228 krb5_free_principal(context, me);
2229 }
2230 if (impersonate_princ) {
2231 krb5_free_principal(context, impersonate_princ);
2232 }
2233 if (ccache) {
2234 krb5_cc_close(context, ccache);
2235 }
2236 krb5_free_context(context);
2237
2238 return ret;
2239 }
2240
2241 /*
2242 * smb_krb5_principal_get_realm
2243 *
2244 * @brief Get realm of a principal
2245 *
2246 * @param[in] context The krb5_context
2247 * @param[in] principal The principal
2248 * @return pointer to the realm
2249 *
2250 */
2251
2252 char *smb_krb5_principal_get_realm(krb5_context context,
2253 krb5_principal principal)
2254 {
2255 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2256 return krb5_principal_get_realm(context, principal);
2257 #elif defined(krb5_princ_realm) /* MIT */
2258 krb5_data *realm;
2259 realm = krb5_princ_realm(context, principal);
2260 return (char *)realm->data;
2261 #else
2262 return NULL;
2263 #endif
2264 }
2265
2266 #else /* HAVE_KRB5 */
2267 /* this saves a few linking headaches */
2268 int cli_krb5_get_ticket(const char *principal, time_t time_offset,
2269 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, uint32 extra_ap_opts,
2270 const char *ccname, time_t *tgs_expire,
2271 const char *impersonate_princ_s)
2272 {
2273 DEBUG(0,("NO KERBEROS SUPPORT\n"));
2274 return 1;
2275 }
2276
2277 #endif
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