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s3: QNX doesn't know uint - replace with uint_t
[Samba.git] / source3 / libsmb / clikrb5.c
blobaa98d7668f1894e6533e8dc6587c1298cad43414
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 2005-2007
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, NULL, &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, NULL, &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 {
660 krb5_error_code retval;
661 krb5_principal server;
662 krb5_creds * credsp;
663 krb5_creds creds;
664 krb5_data in_data;
665 bool creds_ready = False;
666 int i = 0, maxtries = 3;
667
668 ZERO_STRUCT(in_data);
669
670 retval = smb_krb5_parse_name(context, principal, &server);
671 if (retval) {
672 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
673 return retval;
674 }
675
676 /* obtain ticket & session key */
677 ZERO_STRUCT(creds);
678 if ((retval = krb5_copy_principal(context, server, &creds.server))) {
679 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
680 error_message(retval)));
681 goto cleanup_princ;
682 }
683
684 if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
685 /* This can commonly fail on smbd startup with no ticket in the cache.
686 * Report at higher level than 1. */
687 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
688 error_message(retval)));
689 goto cleanup_creds;
690 }
691
692 while (!creds_ready && (i < maxtries)) {
693
694 if ((retval = krb5_get_credentials(context, 0, ccache,
695 &creds, &credsp))) {
696 DEBUG(1,("ads_krb5_mk_req: krb5_get_credentials failed for %s (%s)\n",
697 principal, error_message(retval)));
698 goto cleanup_creds;
699 }
700
701 /* cope with ticket being in the future due to clock skew */
702 if ((unsigned)credsp->times.starttime > time(NULL)) {
703 time_t t = time(NULL);
704 int time_offset =(int)((unsigned)credsp->times.starttime-t);
705 DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
706 krb5_set_real_time(context, t + time_offset + 1, 0);
707 }
708
709 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
710 creds_ready = True;
711 }
712
713 i++;
714 }
715
716 DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
717 principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
718 http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
719 (unsigned)credsp->times.endtime));
720
721 if (expire_time) {
722 *expire_time = (time_t)credsp->times.endtime;
723 }
724
725 #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)
726 if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
727 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
728 as part of the kerberos exchange. */
729
730 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n") );
731
732 if( *auth_context == NULL ) {
733 /* Allocate if it has not yet been allocated. */
734 retval = krb5_auth_con_init( context, auth_context );
735 if (retval) {
736 DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_init failed (%s)\n",
737 error_message(retval)));
738 goto cleanup_creds;
739 }
740 }
741
742 retval = krb5_auth_con_setuseruserkey( context, *auth_context, &credsp->keyblock );
743 if (retval) {
744 DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_setuseruserkey failed (%s)\n",
745 error_message(retval)));
746 goto cleanup_creds;
747 }
748
749 /* Must use a subkey for forwarded tickets. */
750 retval = krb5_auth_con_setflags( context, *auth_context, KRB5_AUTH_CONTEXT_USE_SUBKEY);
751 if (retval) {
752 DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_setflags failed (%s)\n",
753 error_message(retval)));
754 goto cleanup_creds;
755 }
756
757 retval = ads_krb5_get_fwd_ticket( context,
758 auth_context,
759 credsp,
760 ccache,
761 &in_data );
762 if (retval) {
763 DEBUG( 3, ("ads_krb5_get_fwd_ticket failed (%s)\n",
764 error_message( retval ) ) );
765
766 /*
767 * This is not fatal. Delete the *auth_context and continue
768 * with krb5_mk_req_extended to get a non-forwardable ticket.
769 */
770
771 if (in_data.data) {
772 free( in_data.data );
773 in_data.data = NULL;
774 in_data.length = 0;
775 }
776 krb5_auth_con_free(context, *auth_context);
777 *auth_context = NULL;
778 }
779 }
780 #endif
781
782 retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
783 &in_data, credsp, outbuf);
784 if (retval) {
785 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
786 error_message(retval)));
787 }
788
789 if (in_data.data) {
790 free( in_data.data );
791 in_data.length = 0;
792 }
793
794 krb5_free_creds(context, credsp);
795
796 cleanup_creds:
797 krb5_free_cred_contents(context, &creds);
798
799 cleanup_princ:
800 krb5_free_principal(context, server);
801
802 return retval;
803 }
804
805 /*
806 get a kerberos5 ticket for the given service
807 */
808 int cli_krb5_get_ticket(const char *principal, time_t time_offset,
809 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
810 uint32 extra_ap_opts, const char *ccname,
811 time_t *tgs_expire)
812
813 {
814 krb5_error_code retval;
815 krb5_data packet;
816 krb5_context context = NULL;
817 krb5_ccache ccdef = NULL;
818 krb5_auth_context auth_context = NULL;
819 krb5_enctype enc_types[] = {
820 #ifdef ENCTYPE_ARCFOUR_HMAC
821 ENCTYPE_ARCFOUR_HMAC,
822 #endif
823 ENCTYPE_DES_CBC_MD5,
824 ENCTYPE_DES_CBC_CRC,
825 ENCTYPE_NULL};
826
827 initialize_krb5_error_table();
828 retval = krb5_init_context(&context);
829 if (retval) {
830 DEBUG(1,("cli_krb5_get_ticket: krb5_init_context failed (%s)\n",
831 error_message(retval)));
832 goto failed;
833 }
834
835 if (time_offset != 0) {
836 krb5_set_real_time(context, time(NULL) + time_offset, 0);
837 }
838
839 if ((retval = krb5_cc_resolve(context, ccname ?
840 ccname : krb5_cc_default_name(context), &ccdef))) {
841 DEBUG(1,("cli_krb5_get_ticket: krb5_cc_default failed (%s)\n",
842 error_message(retval)));
843 goto failed;
844 }
845
846 if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
847 DEBUG(1,("cli_krb5_get_ticket: krb5_set_default_tgs_ktypes failed (%s)\n",
848 error_message(retval)));
849 goto failed;
850 }
851
852 if ((retval = ads_krb5_mk_req(context,
853 &auth_context,
854 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
855 principal,
856 ccdef, &packet,
857 tgs_expire))) {
858 goto failed;
859 }
860
861 get_krb5_smb_session_key(context, auth_context, session_key_krb5, False);
862
863 *ticket = data_blob(packet.data, packet.length);
864
865 kerberos_free_data_contents(context, &packet);
866
867 failed:
868
869 if ( context ) {
870 if (ccdef)
871 krb5_cc_close(context, ccdef);
872 if (auth_context)
873 krb5_auth_con_free(context, auth_context);
874 krb5_free_context(context);
875 }
876
877 return retval;
878 }
879
880 bool get_krb5_smb_session_key(krb5_context context, krb5_auth_context auth_context, DATA_BLOB *session_key, bool remote)
881 {
882 krb5_keyblock *skey = NULL;
883 krb5_error_code err = 0;
884 bool ret = false;
885
886 if (remote) {
887 err = krb5_auth_con_getremotesubkey(context, auth_context, &skey);
888 } else {
889 err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey);
890 }
891
892 if (err || skey == NULL) {
893 DEBUG(10, ("KRB5 error getting session key %d\n", err));
894 goto done;
895 }
896
897 DEBUG(10, ("Got KRB5 session key of length %d\n", (int)KRB5_KEY_LENGTH(skey)));
898 *session_key = data_blob(KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
899 dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
900
901 ret = true;
902
903 done:
904 if (skey) {
905 krb5_free_keyblock(context, skey);
906 }
907
908 return ret;
909 }
910
911
912 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
913 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
914
915 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
916 {
917 static krb5_data kdata;
918
919 kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
920 kdata.length = strlen((const char *)kdata.data);
921 return &kdata;
922 }
923 #endif
924
925 krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
926 {
927 #if defined(HAVE_KRB5_KT_FREE_ENTRY)
928 return krb5_kt_free_entry(context, kt_entry);
929 #elif defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
930 return krb5_free_keytab_entry_contents(context, kt_entry);
931 #else
932 #error UNKNOWN_KT_FREE_FUNCTION
933 #endif
934 }
935
936 void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
937 struct PAC_SIGNATURE_DATA *sig)
938 {
939 #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
940 cksum->cksumtype = (krb5_cksumtype)sig->type;
941 cksum->checksum.length = sig->signature.length;
942 cksum->checksum.data = sig->signature.data;
943 #else
944 cksum->checksum_type = (krb5_cksumtype)sig->type;
945 cksum->length = sig->signature.length;
946 cksum->contents = sig->signature.data;
947 #endif
948 }
949
950 krb5_error_code smb_krb5_verify_checksum(krb5_context context,
951 const krb5_keyblock *keyblock,
952 krb5_keyusage usage,
953 krb5_checksum *cksum,
954 uint8 *data,
955 size_t length)
956 {
957 krb5_error_code ret;
958
959 /* verify the checksum */
960
961 /* welcome to the wonderful world of samba's kerberos abstraction layer:
962 *
963 * function heimdal 0.6.1rc3 heimdal 0.7 MIT krb 1.4.2
964 * -----------------------------------------------------------------------------
965 * krb5_c_verify_checksum - works works
966 * krb5_verify_checksum works (6 args) works (6 args) broken (7 args)
967 */
968
969 #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
970 {
971 krb5_boolean checksum_valid = False;
972 krb5_data input;
973
974 input.data = (char *)data;
975 input.length = length;
976
977 ret = krb5_c_verify_checksum(context,
978 keyblock,
979 usage,
980 &input,
981 cksum,
982 &checksum_valid);
983 if (ret) {
984 DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
985 error_message(ret)));
986 return ret;
987 }
988
989 if (!checksum_valid)
990 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
991 }
992
993 #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
994
995 /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
996 * without enctype and it ignores any key_usage types - Guenther */
997
998 {
999
1000 krb5_crypto crypto;
1001 ret = krb5_crypto_init(context,
1002 keyblock,
1003 0,
1004 &crypto);
1005 if (ret) {
1006 DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
1007 error_message(ret)));
1008 return ret;
1009 }
1010
1011 ret = krb5_verify_checksum(context,
1012 crypto,
1013 usage,
1014 data,
1015 length,
1016 cksum);
1017
1018 krb5_crypto_destroy(context, crypto);
1019 }
1020
1021 #else
1022 #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
1023 #endif
1024
1025 return ret;
1026 }
1027
1028 time_t get_authtime_from_tkt(krb5_ticket *tkt)
1029 {
1030 #if defined(HAVE_KRB5_TKT_ENC_PART2)
1031 return tkt->enc_part2->times.authtime;
1032 #else
1033 return tkt->ticket.authtime;
1034 #endif
1035 }
1036
1037 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1038 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
1039 {
1040 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
1041 if (ap_req->ticket->enc_part.kvno)
1042 return ap_req->ticket->enc_part.kvno;
1043 #else /* Heimdal */
1044 if (ap_req->ticket.enc_part.kvno)
1045 return *ap_req->ticket.enc_part.kvno;
1046 #endif
1047 return 0;
1048 }
1049
1050 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
1051 {
1052 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
1053 return ap_req->ticket.enc_part.etype;
1054 #else /* MIT */
1055 return ap_req->ticket->enc_part.enctype;
1056 #endif
1057 }
1058 #endif /* HAVE_KRB5_DECODE_AP_REQ */
1059
1060 static krb5_error_code
1061 get_key_from_keytab(krb5_context context,
1062 krb5_const_principal server,
1063 krb5_enctype enctype,
1064 krb5_kvno kvno,
1065 krb5_keyblock **out_key)
1066 {
1067 krb5_keytab_entry entry;
1068 krb5_error_code ret;
1069 krb5_keytab keytab;
1070 char *name = NULL;
1071 krb5_keyblock *keyp;
1072
1073 /* We have to open a new keytab handle here, as MIT does
1074 an implicit open/getnext/close on krb5_kt_get_entry. We
1075 may be in the middle of a keytab enumeration when this is
1076 called. JRA. */
1077
1078 ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1079 if (ret) {
1080 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1081 return ret;
1082 }
1083
1084 if ( DEBUGLEVEL >= 10 ) {
1085 if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) {
1086 DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1087 kvno, enctype, name));
1088 TALLOC_FREE(name);
1089 }
1090 }
1091
1092 ret = krb5_kt_get_entry(context,
1093 keytab,
1094 server,
1095 kvno,
1096 enctype,
1097 &entry);
1098
1099 if (ret) {
1100 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1101 goto out;
1102 }
1103
1104 keyp = KRB5_KT_KEY(&entry);
1105
1106 ret = krb5_copy_keyblock(context, keyp, out_key);
1107 if (ret) {
1108 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1109 goto out;
1110 }
1111
1112 smb_krb5_kt_free_entry(context, &entry);
1113
1114 out:
1115 krb5_kt_close(context, keytab);
1116 return ret;
1117 }
1118
1119 /* Prototypes */
1120
1121 krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1122 const krb5_data *inbuf,
1123 krb5_kvno *kvno,
1124 krb5_enctype *enctype)
1125 {
1126 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1127 {
1128 krb5_error_code ret;
1129 krb5_ap_req ap_req;
1130
1131 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1132 if (ret)
1133 return ret;
1134
1135 *kvno = get_kvno_from_ap_req(&ap_req);
1136 *enctype = get_enctype_from_ap_req(&ap_req);
1137
1138 free_AP_REQ(&ap_req);
1139 return 0;
1140 }
1141 #endif
1142
1143 /* Possibly not an appropriate error code. */
1144 return KRB5KDC_ERR_BADOPTION;
1145 }
1146
1147 krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1148 krb5_auth_context *auth_context,
1149 const krb5_data *inbuf,
1150 krb5_const_principal server,
1151 krb5_keytab keytab,
1152 krb5_flags *ap_req_options,
1153 krb5_ticket **ticket,
1154 krb5_keyblock **keyblock)
1155 {
1156 krb5_error_code ret;
1157 krb5_kvno kvno;
1158 krb5_enctype enctype;
1159 krb5_keyblock *local_keyblock;
1160
1161 ret = krb5_rd_req(context,
1162 auth_context,
1163 inbuf,
1164 server,
1165 keytab,
1166 ap_req_options,
1167 ticket);
1168 if (ret) {
1169 return ret;
1170 }
1171
1172 #ifdef KRB5_TICKET_HAS_KEYINFO
1173 enctype = (*ticket)->enc_part.enctype;
1174 kvno = (*ticket)->enc_part.kvno;
1175 #else
1176 ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1177 if (ret) {
1178 return ret;
1179 }
1180 #endif
1181
1182 ret = get_key_from_keytab(context,
1183 server,
1184 enctype,
1185 kvno,
1186 &local_keyblock);
1187 if (ret) {
1188 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1189 goto out;
1190 }
1191
1192 out:
1193 if (ret && local_keyblock != NULL) {
1194 krb5_free_keyblock(context, local_keyblock);
1195 } else {
1196 *keyblock = local_keyblock;
1197 }
1198
1199 return ret;
1200 }
1201
1202 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1203 const char *name,
1204 krb5_principal *principal)
1205 {
1206 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1207 return smb_krb5_parse_name_norealm_conv(context, name, principal);
1208 #endif
1209
1210 /* we are cheating here because parse_name will in fact set the realm.
1211 * We don't care as the only caller of smb_krb5_parse_name_norealm
1212 * ignores the realm anyway when calling
1213 * smb_krb5_principal_compare_any_realm later - Guenther */
1214
1215 return smb_krb5_parse_name(context, name, principal);
1216 }
1217
1218 bool smb_krb5_principal_compare_any_realm(krb5_context context,
1219 krb5_const_principal princ1,
1220 krb5_const_principal princ2)
1221 {
1222 #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1223
1224 return krb5_principal_compare_any_realm(context, princ1, princ2);
1225
1226 /* krb5_princ_size is a macro in MIT */
1227 #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1228
1229 int i, len1, len2;
1230 const krb5_data *p1, *p2;
1231
1232 len1 = krb5_princ_size(context, princ1);
1233 len2 = krb5_princ_size(context, princ2);
1234
1235 if (len1 != len2)
1236 return False;
1237
1238 for (i = 0; i < len1; i++) {
1239
1240 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1241 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1242
1243 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1244 return False;
1245 }
1246
1247 return True;
1248 #else
1249 #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1250 #endif
1251 }
1252
1253 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, /* FILE:/tmp/krb5cc_0 */
1254 const char *client_string, /* gd@BER.SUSE.DE */
1255 const char *service_string, /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1256 time_t *expire_time)
1257 {
1258 krb5_error_code ret;
1259 krb5_context context = NULL;
1260 krb5_ccache ccache = NULL;
1261 krb5_principal client = NULL;
1262 krb5_creds creds, creds_in, *creds_out = NULL;
1263
1264 ZERO_STRUCT(creds);
1265 ZERO_STRUCT(creds_in);
1266
1267 initialize_krb5_error_table();
1268 ret = krb5_init_context(&context);
1269 if (ret) {
1270 goto done;
1271 }
1272
1273 if (!ccache_string) {
1274 ccache_string = krb5_cc_default_name(context);
1275 }
1276
1277 if (!ccache_string) {
1278 ret = EINVAL;
1279 goto done;
1280 }
1281
1282 DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1283
1284 /* FIXME: we should not fall back to defaults */
1285 ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1286 if (ret) {
1287 goto done;
1288 }
1289
1290 if (client_string) {
1291 ret = smb_krb5_parse_name(context, client_string, &client);
1292 if (ret) {
1293 goto done;
1294 }
1295 } else {
1296 ret = krb5_cc_get_principal(context, ccache, &client);
1297 if (ret) {
1298 goto done;
1299 }
1300 }
1301
1302 #ifdef HAVE_KRB5_GET_RENEWED_CREDS /* MIT */
1303 {
1304 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1305 if (ret) {
1306 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1307 goto done;
1308 }
1309 }
1310 #elif defined(HAVE_KRB5_GET_KDC_CRED) /* Heimdal */
1311 {
1312 krb5_kdc_flags flags;
1313 krb5_realm *client_realm = NULL;
1314
1315 ret = krb5_copy_principal(context, client, &creds_in.client);
1316 if (ret) {
1317 goto done;
1318 }
1319
1320 if (service_string) {
1321 ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1322 if (ret) {
1323 goto done;
1324 }
1325 } else {
1326 /* build tgt service by default */
1327 client_realm = krb5_princ_realm(context, creds_in.client);
1328 if (!client_realm) {
1329 ret = ENOMEM;
1330 goto done;
1331 }
1332 ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1333 if (ret) {
1334 goto done;
1335 }
1336 }
1337
1338 flags.i = 0;
1339 flags.b.renewable = flags.b.renew = True;
1340
1341 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1342 if (ret) {
1343 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1344 goto done;
1345 }
1346
1347 creds = *creds_out;
1348 }
1349 #else
1350 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1351 #endif
1352
1353 /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1354 ret = krb5_cc_initialize(context, ccache, client);
1355 if (ret) {
1356 goto done;
1357 }
1358
1359 ret = krb5_cc_store_cred(context, ccache, &creds);
1360
1361 if (expire_time) {
1362 *expire_time = (time_t) creds.times.endtime;
1363 }
1364
1365 done:
1366 krb5_free_cred_contents(context, &creds_in);
1367
1368 if (creds_out) {
1369 krb5_free_creds(context, creds_out);
1370 } else {
1371 krb5_free_cred_contents(context, &creds);
1372 }
1373
1374 if (client) {
1375 krb5_free_principal(context, client);
1376 }
1377 if (ccache) {
1378 krb5_cc_close(context, ccache);
1379 }
1380 if (context) {
1381 krb5_free_context(context);
1382 }
1383
1384 return ret;
1385 }
1386
1387 krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1388 {
1389 krb5_error_code ret = 0;
1390 if (addr == NULL) {
1391 return ret;
1392 }
1393 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1394 krb5_free_addresses(context, addr->addrs);
1395 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1396 ret = krb5_free_addresses(context, addr->addrs);
1397 SAFE_FREE(addr->addrs);
1398 #endif
1399 SAFE_FREE(addr);
1400 addr = NULL;
1401 return ret;
1402 }
1403
1404 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1405 {
1406 krb5_error_code ret = 0;
1407 nstring buf;
1408 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1409 krb5_address **addrs = NULL;
1410 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1411 krb5_addresses *addrs = NULL;
1412 #endif
1413
1414 *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1415 if (*kerb_addr == NULL) {
1416 return ENOMEM;
1417 }
1418
1419 put_name(buf, global_myname(), ' ', 0x20);
1420
1421 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1422 {
1423 int num_addr = 2;
1424
1425 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1426 if (addrs == NULL) {
1427 SAFE_FREE(*kerb_addr);
1428 return ENOMEM;
1429 }
1430
1431 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1432
1433 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1434 if (addrs[0] == NULL) {
1435 SAFE_FREE(addrs);
1436 SAFE_FREE(*kerb_addr);
1437 return ENOMEM;
1438 }
1439
1440 addrs[0]->magic = KV5M_ADDRESS;
1441 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1442 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1443 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1444 if (addrs[0]->contents == NULL) {
1445 SAFE_FREE(addrs[0]);
1446 SAFE_FREE(addrs);
1447 SAFE_FREE(*kerb_addr);
1448 return ENOMEM;
1449 }
1450
1451 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1452
1453 addrs[1] = NULL;
1454 }
1455 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1456 {
1457 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1458 if (addrs == NULL) {
1459 SAFE_FREE(*kerb_addr);
1460 return ENOMEM;
1461 }
1462
1463 memset(addrs, 0, sizeof(krb5_addresses));
1464
1465 addrs->len = 1;
1466 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1467 if (addrs->val == NULL) {
1468 SAFE_FREE(addrs);
1469 SAFE_FREE(kerb_addr);
1470 return ENOMEM;
1471 }
1472
1473 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1474 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1475 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1476 if (addrs->val[0].address.data == NULL) {
1477 SAFE_FREE(addrs->val);
1478 SAFE_FREE(addrs);
1479 SAFE_FREE(*kerb_addr);
1480 return ENOMEM;
1481 }
1482
1483 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1484 }
1485 #else
1486 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1487 #endif
1488 (*kerb_addr)->addrs = addrs;
1489
1490 return ret;
1491 }
1492
1493 void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1494 {
1495 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1496 krb5_free_error_contents(context, krberror);
1497 #else /* MIT */
1498 krb5_free_error(context, krberror);
1499 #endif
1500 }
1501
1502 krb5_error_code handle_krberror_packet(krb5_context context,
1503 krb5_data *packet)
1504 {
1505 krb5_error_code ret;
1506 bool got_error_code = False;
1507
1508 DEBUG(10,("handle_krberror_packet: got error packet\n"));
1509
1510 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1511 {
1512 krb5_error krberror;
1513
1514 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1515 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1516 error_message(ret)));
1517 return ret;
1518 }
1519
1520 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1521 ret = (krb5_error_code) krberror.error_code;
1522 got_error_code = True;
1523 }
1524
1525 smb_krb5_free_error(context, &krberror);
1526 }
1527 #else /* MIT */
1528 {
1529 krb5_error *krberror;
1530
1531 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1532 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1533 error_message(ret)));
1534 return ret;
1535 }
1536
1537 if (krberror->e_data.data == NULL) {
1538 ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1539 got_error_code = True;
1540 }
1541 smb_krb5_free_error(context, krberror);
1542 }
1543 #endif
1544 if (got_error_code) {
1545 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1546 error_message(ret), ret));
1547 }
1548 return ret;
1549 }
1550
1551 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1552 krb5_get_init_creds_opt **opt)
1553 {
1554 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1555 /* Heimdal or modern MIT version */
1556 return krb5_get_init_creds_opt_alloc(context, opt);
1557 #else
1558 /* Historical MIT version */
1559 krb5_get_init_creds_opt *my_opt;
1560
1561 *opt = NULL;
1562
1563 if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1564 return ENOMEM;
1565 }
1566
1567 krb5_get_init_creds_opt_init(my_opt);
1568
1569 *opt = my_opt;
1570 return 0;
1571 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC */
1572 }
1573
1574 void smb_krb5_get_init_creds_opt_free(krb5_context context,
1575 krb5_get_init_creds_opt *opt)
1576 {
1577 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1578
1579 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1580 /* Modern MIT or Heimdal version */
1581 krb5_get_init_creds_opt_free(context, opt);
1582 #else
1583 /* Heimdal version */
1584 krb5_get_init_creds_opt_free(opt);
1585 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1586
1587 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1588 /* Historical MIT version */
1589 SAFE_FREE(opt);
1590 opt = NULL;
1591 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1592 }
1593
1594 krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1595 {
1596 return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1597 }
1598
1599
1600 /* caller needs to free etype_s */
1601 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1602 krb5_enctype enctype,
1603 char **etype_s)
1604 {
1605 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1606 return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1607 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1608 char buf[256];
1609 krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1610 if (ret) {
1611 return ret;
1612 }
1613 *etype_s = SMB_STRDUP(buf);
1614 if (!*etype_s) {
1615 return ENOMEM;
1616 }
1617 return ret;
1618 #else
1619 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1620 #endif
1621 }
1622
1623 krb5_error_code smb_krb5_mk_error(krb5_context context,
1624 krb5_error_code error_code,
1625 const krb5_principal server,
1626 krb5_data *reply)
1627 {
1628 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1629 /*
1630 * The MIT interface is *terrible*.
1631 * We have to construct this ourselves...
1632 */
1633 krb5_error e;
1634
1635 memset(&e, 0, sizeof(e));
1636 krb5_us_timeofday(context, &e.stime, &e.susec);
1637 e.server = server;
1638 #if defined(krb5_err_base)
1639 e.error = error_code - krb5_err_base;
1640 #elif defined(ERROR_TABLE_BASE_krb5)
1641 e.error = error_code - ERROR_TABLE_BASE_krb5;
1642 #else
1643 e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1644 #endif
1645
1646 return krb5_mk_error(context, &e, reply);
1647 #else /* Heimdal. */
1648 return krb5_mk_error(context,
1649 error_code,
1650 NULL,
1651 NULL, /* e_data */
1652 NULL,
1653 server,
1654 NULL,
1655 NULL,
1656 reply);
1657 #endif
1658 }
1659
1660 /**********************************************************************
1661 * Open a krb5 keytab with flags, handles readonly or readwrite access and
1662 * allows to process non-default keytab names.
1663 * @param context krb5_context
1664 * @param keytab_name_req string
1665 * @param write_access bool if writable keytab is required
1666 * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1667 * @return krb5_error_code
1668 **********************************************************************/
1669
1670 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1671 #ifndef MAX_KEYTAB_NAME_LEN
1672 #define MAX_KEYTAB_NAME_LEN 1100
1673 #endif
1674
1675 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1676 const char *keytab_name_req,
1677 bool write_access,
1678 krb5_keytab *keytab)
1679 {
1680 krb5_error_code ret = 0;
1681 TALLOC_CTX *mem_ctx;
1682 char keytab_string[MAX_KEYTAB_NAME_LEN];
1683 char *kt_str = NULL;
1684 bool found_valid_name = False;
1685 const char *pragma = "FILE";
1686 const char *tmp = NULL;
1687
1688 if (!write_access && !keytab_name_req) {
1689 /* caller just wants to read the default keytab readonly, so be it */
1690 return krb5_kt_default(context, keytab);
1691 }
1692
1693 mem_ctx = talloc_init("smb_krb5_open_keytab");
1694 if (!mem_ctx) {
1695 return ENOMEM;
1696 }
1697
1698 #ifdef HAVE_WRFILE_KEYTAB
1699 if (write_access) {
1700 pragma = "WRFILE";
1701 }
1702 #endif
1703
1704 if (keytab_name_req) {
1705
1706 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1707 ret = KRB5_CONFIG_NOTENUFSPACE;
1708 goto out;
1709 }
1710
1711 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1712 (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1713 tmp = keytab_name_req;
1714 goto resolve;
1715 }
1716
1717 if (keytab_name_req[0] != '/') {
1718 ret = KRB5_KT_BADNAME;
1719 goto out;
1720 }
1721
1722 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1723 if (!tmp) {
1724 ret = ENOMEM;
1725 goto out;
1726 }
1727
1728 goto resolve;
1729 }
1730
1731 /* we need to handle more complex keytab_strings, like:
1732 * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1733
1734 ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1735 if (ret) {
1736 goto out;
1737 }
1738
1739 DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1740
1741 tmp = talloc_strdup(mem_ctx, keytab_string);
1742 if (!tmp) {
1743 ret = ENOMEM;
1744 goto out;
1745 }
1746
1747 if (strncmp(tmp, "ANY:", 4) == 0) {
1748 tmp += 4;
1749 }
1750
1751 memset(&keytab_string, '\0', sizeof(keytab_string));
1752
1753 while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1754 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1755 found_valid_name = True;
1756 tmp = kt_str;
1757 tmp += 7;
1758 }
1759
1760 if (strncmp(kt_str, "FILE:", 5) == 0) {
1761 found_valid_name = True;
1762 tmp = kt_str;
1763 tmp += 5;
1764 }
1765
1766 if (tmp[0] == '/') {
1767 /* Treat as a FILE: keytab definition. */
1768 found_valid_name = true;
1769 }
1770
1771 if (found_valid_name) {
1772 if (tmp[0] != '/') {
1773 ret = KRB5_KT_BADNAME;
1774 goto out;
1775 }
1776
1777 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1778 if (!tmp) {
1779 ret = ENOMEM;
1780 goto out;
1781 }
1782 break;
1783 }
1784 }
1785
1786 if (!found_valid_name) {
1787 ret = KRB5_KT_UNKNOWN_TYPE;
1788 goto out;
1789 }
1790
1791 resolve:
1792 DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1793 ret = krb5_kt_resolve(context, tmp, keytab);
1794
1795 out:
1796 TALLOC_FREE(mem_ctx);
1797 return ret;
1798 }
1799
1800 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1801 krb5_context context,
1802 krb5_keytab keytab,
1803 const char **keytab_name)
1804 {
1805 char keytab_string[MAX_KEYTAB_NAME_LEN];
1806 krb5_error_code ret = 0;
1807
1808 ret = krb5_kt_get_name(context, keytab,
1809 keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1810 if (ret) {
1811 return ret;
1812 }
1813
1814 *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1815 if (!*keytab_name) {
1816 return ENOMEM;
1817 }
1818
1819 return ret;
1820 }
1821
1822 #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)
1823 /**************************************************************
1824 Routine: ads_krb5_get_fwd_ticket
1825 Description:
1826 When a service ticket is flagged as trusted
1827 for delegation we should provide a forwardable
1828 ticket so that the remote host can act on our
1829 behalf. This is done by taking the 2nd forwardable
1830 TGT and storing it in the GSS-API authenticator
1831 "checksum". This routine will populate
1832 the krb5_data authenticator with this TGT.
1833 Parameters:
1834 krb5_context context: The kerberos context for this authentication.
1835 krb5_auth_context: The authentication context.
1836 krb5_creds *credsp: The ticket credentials (AS-REP).
1837 krb5_ccache ccache: The credentials cache.
1838 krb5_data &authenticator: The checksum field that will store the TGT, and
1839 authenticator.data must be freed by the caller.
1840
1841 Returns:
1842 krb5_error_code: 0 if no errors, otherwise set.
1843 **************************************************************/
1844
1845 static krb5_error_code ads_krb5_get_fwd_ticket( krb5_context context,
1846 krb5_auth_context *auth_context,
1847 krb5_creds *credsp,
1848 krb5_ccache ccache,
1849 krb5_data *authenticator)
1850 {
1851 krb5_data fwdData;
1852 krb5_error_code retval = 0;
1853 char *pChksum = NULL;
1854 char *p = NULL;
1855
1856 ZERO_STRUCT(fwdData);
1857 ZERO_STRUCTP(authenticator);
1858
1859 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
1860 *auth_context, /* Authentication context [in] */
1861 CONST_DISCARD(char *, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
1862 credsp->client, /* Client principal for the tgt [in] */
1863 credsp->server, /* Server principal for the tgt [in] */
1864 ccache, /* Credential cache to use for storage [in] */
1865 1, /* Turn on for "Forwardable ticket" [in] */
1866 &fwdData ); /* Resulting response [out] */
1867
1868
1869 if (retval) {
1870 DEBUG(1,("ads_krb5_get_fwd_ticket: krb5_fwd_tgt_creds failed (%s)\n",
1871 error_message(retval)));
1872 goto out;
1873 }
1874
1875 if ((unsigned int)GSSAPI_CHECKSUM_SIZE + (unsigned int)fwdData.length <
1876 (unsigned int)GSSAPI_CHECKSUM_SIZE) {
1877 retval = EINVAL;
1878 goto out;
1879 }
1880
1881 /* We're going to allocate a gssChecksum structure with a little
1882 extra data the length of the kerberos credentials length
1883 (APPLICATION 22) so that we can pack it on the end of the structure.
1884 */
1885
1886 pChksum = (char *)SMB_MALLOC(GSSAPI_CHECKSUM_SIZE + fwdData.length );
1887 if (!pChksum) {
1888 retval = ENOMEM;
1889 goto out;
1890 }
1891
1892 p = pChksum;
1893
1894 SIVAL(p, 0, GSSAPI_BNDLENGTH);
1895 p += 4;
1896
1897 /* Zero out the bindings fields */
1898 memset(p, '\0', GSSAPI_BNDLENGTH );
1899 p += GSSAPI_BNDLENGTH;
1900
1901 SIVAL(p, 0, GSS_C_DELEG_FLAG );
1902 p += 4;
1903 SSVAL(p, 0, 1 );
1904 p += 2;
1905 SSVAL(p, 0, fwdData.length );
1906 p += 2;
1907
1908 /* Migrate the kerberos KRB_CRED data to the checksum delegation */
1909 memcpy(p, fwdData.data, fwdData.length );
1910 p += fwdData.length;
1911
1912 /* We need to do this in order to allow our GSS-API */
1913 retval = krb5_auth_con_set_req_cksumtype( context, *auth_context, GSSAPI_CHECKSUM );
1914 if (retval) {
1915 goto out;
1916 }
1917
1918 /* We now have a service ticket, now turn it into an AP-REQ. */
1919 authenticator->length = fwdData.length + GSSAPI_CHECKSUM_SIZE;
1920
1921 /* Caller should call free() when they're done with this. */
1922 authenticator->data = (char *)pChksum;
1923
1924 out:
1925
1926 /* Remove that input data, we never needed it anyway. */
1927 if (fwdData.length > 0) {
1928 krb5_free_data_contents( context, &fwdData );
1929 }
1930
1931 return retval;
1932 }
1933 #endif
1934
1935 #else /* HAVE_KRB5 */
1936 /* this saves a few linking headaches */
1937 int cli_krb5_get_ticket(const char *principal, time_t time_offset,
1938 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, uint32 extra_ap_opts,
1939 const char *ccname, time_t *tgs_expire)
1940 {
1941 DEBUG(0,("NO KERBEROS SUPPORT\n"));
1942 return 1;
1943 }
1944
1945 #endif
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