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Do proper error handling if the socket is closed
[Samba/gebeck_regimport.git] / source3 / libsmb / clikrb5.c
blobf940081072ae3cc183ccb585ff09cb43c8ceed7b
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_allocate(&utf8_name, name, &converted_size)) {
60 return ENOMEM;
61 }
62
63 ret = krb5_parse_name(context, utf8_name, principal);
64 SAFE_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_allocate(&utf8_name, name, &converted_size)) {
83 return ENOMEM;
84 }
85
86 ret = krb5_parse_name_norealm(context, utf8_name, principal);
87 SAFE_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 normal free() call.
95 **************************************************************/
96
97 krb5_error_code smb_krb5_unparse_name(krb5_context context,
98 krb5_const_principal principal,
99 char **unix_name)
100 {
101 krb5_error_code ret;
102 char *utf8_name;
103 size_t converted_size;
104
105 *unix_name = NULL;
106 ret = krb5_unparse_name(context, principal, &utf8_name);
107 if (ret) {
108 return ret;
109 }
110
111 if (!pull_utf8_allocate(unix_name, utf8_name, &converted_size)) {
112 krb5_free_unparsed_name(context, utf8_name);
113 return ENOMEM;
114 }
115 krb5_free_unparsed_name(context, utf8_name);
116 return 0;
117 }
118
119 #ifndef HAVE_KRB5_SET_REAL_TIME
120 /*
121 * This function is not in the Heimdal mainline.
122 */
123 krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds)
124 {
125 krb5_error_code ret;
126 int32_t sec, usec;
127
128 ret = krb5_us_timeofday(context, &sec, &usec);
129 if (ret)
130 return ret;
131
132 context->kdc_sec_offset = seconds - sec;
133 context->kdc_usec_offset = microseconds - usec;
134
135 return 0;
136 }
137 #endif
138
139 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
140
141 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
142
143 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
144 * to krb5_set_default_tgs_ktypes. See
145 * http://lists.samba.org/archive/samba-technical/2006-July/048271.html
146 *
147 * If the MIT libraries are not exporting internal symbols, we will end up in
148 * this branch, which is correct. Otherwise we will continue to use the
149 * internal symbol
150 */
151 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
152 {
153 return krb5_set_default_tgs_enctypes(ctx, enc);
154 }
155
156 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
157
158 /* Heimdal */
159 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
160 {
161 return krb5_set_default_in_tkt_etypes(ctx, enc);
162 }
163
164 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
165
166 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
167
168 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
169 /* HEIMDAL */
170 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
171 {
172 memset(pkaddr, '\0', sizeof(krb5_address));
173 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
174 if (paddr->ss_family == AF_INET6) {
175 pkaddr->addr_type = KRB5_ADDRESS_INET6;
176 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
177 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
178 return true;
179 }
180 #endif
181 if (paddr->ss_family == AF_INET) {
182 pkaddr->addr_type = KRB5_ADDRESS_INET;
183 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
184 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
185 return true;
186 }
187 return false;
188 }
189 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
190 /* MIT */
191 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
192 {
193 memset(pkaddr, '\0', sizeof(krb5_address));
194 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
195 if (paddr->ss_family == AF_INET6) {
196 pkaddr->addrtype = ADDRTYPE_INET6;
197 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
198 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
199 return true;
200 }
201 #endif
202 if (paddr->ss_family == AF_INET) {
203 pkaddr->addrtype = ADDRTYPE_INET;
204 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
205 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
206 return true;
207 }
208 return false;
209 }
210 #else
211 #error UNKNOWN_ADDRTYPE
212 #endif
213
214 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY) && defined(HAVE_KRB5_ENCRYPT_BLOCK)
215 static int create_kerberos_key_from_string_direct(krb5_context context,
216 krb5_principal host_princ,
217 krb5_data *password,
218 krb5_keyblock *key,
219 krb5_enctype enctype)
220 {
221 int ret = 0;
222 krb5_data salt;
223 krb5_encrypt_block eblock;
224
225 ret = krb5_principal2salt(context, host_princ, &salt);
226 if (ret) {
227 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
228 return ret;
229 }
230 krb5_use_enctype(context, &eblock, enctype);
231 ret = krb5_string_to_key(context, &eblock, key, password, &salt);
232 SAFE_FREE(salt.data);
233
234 return ret;
235 }
236 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
237 static int create_kerberos_key_from_string_direct(krb5_context context,
238 krb5_principal host_princ,
239 krb5_data *password,
240 krb5_keyblock *key,
241 krb5_enctype enctype)
242 {
243 int ret;
244 krb5_salt salt;
245
246 ret = krb5_get_pw_salt(context, host_princ, &salt);
247 if (ret) {
248 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
249 return ret;
250 }
251
252 ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
253 krb5_free_salt(context, salt);
254
255 return ret;
256 }
257 #else
258 #error UNKNOWN_CREATE_KEY_FUNCTIONS
259 #endif
260
261 int create_kerberos_key_from_string(krb5_context context,
262 krb5_principal host_princ,
263 krb5_data *password,
264 krb5_keyblock *key,
265 krb5_enctype enctype,
266 bool no_salt)
267 {
268 krb5_principal salt_princ = NULL;
269 int ret;
270 /*
271 * Check if we've determined that the KDC is salting keys for this
272 * principal/enctype in a non-obvious way. If it is, try to match
273 * its behavior.
274 */
275 if (no_salt) {
276 KRB5_KEY_DATA(key) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
277 if (!KRB5_KEY_DATA(key)) {
278 return ENOMEM;
279 }
280 memcpy(KRB5_KEY_DATA(key), password->data, password->length);
281 KRB5_KEY_LENGTH(key) = password->length;
282 KRB5_KEY_TYPE(key) = enctype;
283 return 0;
284 }
285 salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype);
286 ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype);
287 if (salt_princ) {
288 krb5_free_principal(context, salt_princ);
289 }
290 return ret;
291 }
292
293 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
294 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
295 krb5_enctype **enctypes)
296 {
297 return krb5_get_permitted_enctypes(context, enctypes);
298 }
299 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
300 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
301 krb5_enctype **enctypes)
302 {
303 return krb5_get_default_in_tkt_etypes(context, enctypes);
304 }
305 #else
306 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
307 #endif
308
309 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
310 krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
311 krb5_auth_context auth_context,
312 krb5_keyblock *keyblock)
313 {
314 return krb5_auth_con_setkey(context, auth_context, keyblock);
315 }
316 #endif
317
318 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
319 DATA_BLOB *edata,
320 DATA_BLOB *edata_out)
321 {
322 DATA_BLOB edata_contents;
323 ASN1_DATA data;
324 int edata_type;
325
326 if (!edata->length) {
327 return False;
328 }
329
330 asn1_load(&data, *edata);
331 asn1_start_tag(&data, ASN1_SEQUENCE(0));
332 asn1_start_tag(&data, ASN1_CONTEXT(1));
333 asn1_read_Integer(&data, &edata_type);
334
335 if (edata_type != KRB5_PADATA_PW_SALT) {
336 DEBUG(0,("edata is not of required type %d but of type %d\n",
337 KRB5_PADATA_PW_SALT, edata_type));
338 asn1_free(&data);
339 return False;
340 }
341
342 asn1_start_tag(&data, ASN1_CONTEXT(2));
343 asn1_read_OctetString(&data, &edata_contents);
344 asn1_end_tag(&data);
345 asn1_end_tag(&data);
346 asn1_end_tag(&data);
347 asn1_free(&data);
348
349 *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
350
351 data_blob_free(&edata_contents);
352
353 return True;
354 }
355
356
357 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
358 {
359 DATA_BLOB pac_contents;
360 ASN1_DATA data;
361 int data_type;
362
363 if (!auth_data->length) {
364 return False;
365 }
366
367 asn1_load(&data, *auth_data);
368 asn1_start_tag(&data, ASN1_SEQUENCE(0));
369 asn1_start_tag(&data, ASN1_SEQUENCE(0));
370 asn1_start_tag(&data, ASN1_CONTEXT(0));
371 asn1_read_Integer(&data, &data_type);
372
373 if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) {
374 DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type));
375 asn1_free(&data);
376 return False;
377 }
378
379 asn1_end_tag(&data);
380 asn1_start_tag(&data, ASN1_CONTEXT(1));
381 asn1_read_OctetString(&data, &pac_contents);
382 asn1_end_tag(&data);
383 asn1_end_tag(&data);
384 asn1_end_tag(&data);
385 asn1_free(&data);
386
387 *unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length);
388
389 data_blob_free(&pac_contents);
390
391 return True;
392 }
393
394 bool get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt)
395 {
396 DATA_BLOB auth_data_wrapped;
397 bool got_auth_data_pac = False;
398 int i;
399
400 #if defined(HAVE_KRB5_TKT_ENC_PART2)
401 if (tkt->enc_part2 && tkt->enc_part2->authorization_data &&
402 tkt->enc_part2->authorization_data[0] &&
403 tkt->enc_part2->authorization_data[0]->length)
404 {
405 for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) {
406
407 if (tkt->enc_part2->authorization_data[i]->ad_type !=
408 KRB5_AUTHDATA_IF_RELEVANT) {
409 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
410 tkt->enc_part2->authorization_data[i]->ad_type));
411 continue;
412 }
413
414 auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents,
415 tkt->enc_part2->authorization_data[i]->length);
416
417 /* check if it is a PAC */
418 got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
419 data_blob_free(&auth_data_wrapped);
420
421 if (got_auth_data_pac) {
422 return true;
423 }
424 }
425
426 return got_auth_data_pac;
427 }
428
429 #else
430 if (tkt->ticket.authorization_data &&
431 tkt->ticket.authorization_data->len)
432 {
433 for (i = 0; i < tkt->ticket.authorization_data->len; i++) {
434
435 if (tkt->ticket.authorization_data->val[i].ad_type !=
436 KRB5_AUTHDATA_IF_RELEVANT) {
437 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
438 tkt->ticket.authorization_data->val[i].ad_type));
439 continue;
440 }
441
442 auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data,
443 tkt->ticket.authorization_data->val[i].ad_data.length);
444
445 /* check if it is a PAC */
446 got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
447 data_blob_free(&auth_data_wrapped);
448
449 if (got_auth_data_pac) {
450 return true;
451 }
452 }
453
454 return got_auth_data_pac;
455 }
456 #endif
457 return False;
458 }
459
460 krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
461 {
462 #if defined(HAVE_KRB5_TKT_ENC_PART2)
463 return tkt->enc_part2->client;
464 #else
465 return tkt->client;
466 #endif
467 }
468
469 #if !defined(HAVE_KRB5_LOCATE_KDC)
470
471 /* krb5_locate_kdc is an internal MIT symbol. MIT are not yet willing to commit
472 * to a public interface for this functionality, so we have to be able to live
473 * without it if the MIT libraries are hiding their internal symbols.
474 */
475
476 #if defined(KRB5_KRBHST_INIT)
477 /* Heimdal */
478 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters)
479 {
480 krb5_krbhst_handle hnd;
481 krb5_krbhst_info *hinfo;
482 krb5_error_code rc;
483 int num_kdcs, i;
484 struct sockaddr *sa;
485 struct addrinfo *ai;
486
487 *addr_pp = NULL;
488 *naddrs = 0;
489
490 rc = krb5_krbhst_init(ctx, realm->data, KRB5_KRBHST_KDC, &hnd);
491 if (rc) {
492 DEBUG(0, ("smb_krb5_locate_kdc: krb5_krbhst_init failed (%s)\n", error_message(rc)));
493 return rc;
494 }
495
496 for ( num_kdcs = 0; (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); num_kdcs++)
497 ;
498
499 krb5_krbhst_reset(ctx, hnd);
500
501 if (!num_kdcs) {
502 DEBUG(0, ("smb_krb5_locate_kdc: zero kdcs found !\n"));
503 krb5_krbhst_free(ctx, hnd);
504 return -1;
505 }
506
507 sa = SMB_MALLOC_ARRAY( struct sockaddr, num_kdcs );
508 if (!sa) {
509 DEBUG(0, ("smb_krb5_locate_kdc: malloc failed\n"));
510 krb5_krbhst_free(ctx, hnd);
511 naddrs = 0;
512 return -1;
513 }
514
515 memset(sa, '\0', sizeof(struct sockaddr) * num_kdcs );
516
517 for (i = 0; i < num_kdcs && (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); i++) {
518
519 #if defined(HAVE_KRB5_KRBHST_GET_ADDRINFO)
520 rc = krb5_krbhst_get_addrinfo(ctx, hinfo, &ai);
521 if (rc) {
522 DEBUG(0,("krb5_krbhst_get_addrinfo failed: %s\n", error_message(rc)));
523 continue;
524 }
525 #endif
526 if (hinfo->ai && hinfo->ai->ai_family == AF_INET)
527 memcpy(&sa[i], hinfo->ai->ai_addr, sizeof(struct sockaddr));
528 }
529
530 krb5_krbhst_free(ctx, hnd);
531
532 *naddrs = num_kdcs;
533 *addr_pp = sa;
534 return 0;
535 }
536
537 #else /* ! defined(KRB5_KRBHST_INIT) */
538
539 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
540 struct sockaddr **addr_pp, int *naddrs, int get_masters)
541 {
542 DEBUG(0, ("unable to explicitly locate the KDC on this platform\n"));
543 return KRB5_KDC_UNREACH;
544 }
545
546 #endif /* KRB5_KRBHST_INIT */
547
548 #else /* ! HAVE_KRB5_LOCATE_KDC */
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 return krb5_locate_kdc(ctx, realm, addr_pp, naddrs, get_masters);
554 }
555
556 #endif /* HAVE_KRB5_LOCATE_KDC */
557
558 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
559 void krb5_free_unparsed_name(krb5_context context, char *val)
560 {
561 SAFE_FREE(val);
562 }
563 #endif
564
565 void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
566 {
567 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
568 if (pdata->data) {
569 krb5_free_data_contents(context, pdata);
570 }
571 #else
572 SAFE_FREE(pdata->data);
573 #endif
574 }
575
576 void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype)
577 {
578 #if defined(HAVE_KRB5_KEYBLOCK_IN_CREDS)
579 KRB5_KEY_TYPE((&pcreds->keyblock)) = enctype;
580 #elif defined(HAVE_KRB5_SESSION_IN_CREDS)
581 KRB5_KEY_TYPE((&pcreds->session)) = enctype;
582 #else
583 #error UNKNOWN_KEYBLOCK_MEMBER_IN_KRB5_CREDS_STRUCT
584 #endif
585 }
586
587 bool kerberos_compatible_enctypes(krb5_context context,
588 krb5_enctype enctype1,
589 krb5_enctype enctype2)
590 {
591 #if defined(HAVE_KRB5_C_ENCTYPE_COMPARE)
592 krb5_boolean similar = 0;
593
594 krb5_c_enctype_compare(context, enctype1, enctype2, &similar);
595 return similar ? True : False;
596 #elif defined(HAVE_KRB5_ENCTYPES_COMPATIBLE_KEYS)
597 return krb5_enctypes_compatible_keys(context, enctype1, enctype2) ? True : False;
598 #endif
599 }
600
601 static bool ads_cleanup_expired_creds(krb5_context context,
602 krb5_ccache ccache,
603 krb5_creds *credsp)
604 {
605 krb5_error_code retval;
606 const char *cc_type = krb5_cc_get_type(context, ccache);
607
608 DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
609 cc_type, krb5_cc_get_name(context, ccache),
610 http_timestring(credsp->times.endtime)));
611
612 /* we will probably need new tickets if the current ones
613 will expire within 10 seconds.
614 */
615 if (credsp->times.endtime >= (time(NULL) + 10))
616 return False;
617
618 /* heimdal won't remove creds from a file ccache, and
619 perhaps we shouldn't anyway, since internally we
620 use memory ccaches, and a FILE one probably means that
621 we're using creds obtained outside of our exectuable
622 */
623 if (strequal(cc_type, "FILE")) {
624 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
625 return False;
626 }
627
628 retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
629 if (retval) {
630 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
631 error_message(retval)));
632 /* If we have an error in this, we want to display it,
633 but continue as though we deleted it */
634 }
635 return True;
636 }
637
638 /*
639 we can't use krb5_mk_req because w2k wants the service to be in a particular format
640 */
641 static krb5_error_code ads_krb5_mk_req(krb5_context context,
642 krb5_auth_context *auth_context,
643 const krb5_flags ap_req_options,
644 const char *principal,
645 krb5_ccache ccache,
646 krb5_data *outbuf,
647 time_t *expire_time)
648 {
649 krb5_error_code retval;
650 krb5_principal server;
651 krb5_creds * credsp;
652 krb5_creds creds;
653 krb5_data in_data;
654 bool creds_ready = False;
655 int i = 0, maxtries = 3;
656
657 ZERO_STRUCT(in_data);
658
659 retval = smb_krb5_parse_name(context, principal, &server);
660 if (retval) {
661 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
662 return retval;
663 }
664
665 /* obtain ticket & session key */
666 ZERO_STRUCT(creds);
667 if ((retval = krb5_copy_principal(context, server, &creds.server))) {
668 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
669 error_message(retval)));
670 goto cleanup_princ;
671 }
672
673 if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
674 /* This can commonly fail on smbd startup with no ticket in the cache.
675 * Report at higher level than 1. */
676 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
677 error_message(retval)));
678 goto cleanup_creds;
679 }
680
681 while (!creds_ready && (i < maxtries)) {
682
683 if ((retval = krb5_get_credentials(context, 0, ccache,
684 &creds, &credsp))) {
685 DEBUG(1,("ads_krb5_mk_req: krb5_get_credentials failed for %s (%s)\n",
686 principal, error_message(retval)));
687 goto cleanup_creds;
688 }
689
690 /* cope with ticket being in the future due to clock skew */
691 if ((unsigned)credsp->times.starttime > time(NULL)) {
692 time_t t = time(NULL);
693 int time_offset =(int)((unsigned)credsp->times.starttime-t);
694 DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
695 krb5_set_real_time(context, t + time_offset + 1, 0);
696 }
697
698 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
699 creds_ready = True;
700 }
701
702 i++;
703 }
704
705 DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
706 principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
707 http_timestring((unsigned)credsp->times.endtime),
708 (unsigned)credsp->times.endtime));
709
710 if (expire_time) {
711 *expire_time = (time_t)credsp->times.endtime;
712 }
713
714 #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)
715 if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
716 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
717 as part of the kerberos exchange. */
718
719 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n") );
720
721 if( *auth_context == NULL ) {
722 /* Allocate if it has not yet been allocated. */
723 retval = krb5_auth_con_init( context, auth_context );
724 if (retval) {
725 DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_init failed (%s)\n",
726 error_message(retval)));
727 goto cleanup_creds;
728 }
729 }
730
731 retval = krb5_auth_con_setuseruserkey( context, *auth_context, &credsp->keyblock );
732 if (retval) {
733 DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_setuseruserkey failed (%s)\n",
734 error_message(retval)));
735 goto cleanup_creds;
736 }
737
738 /* Must use a subkey for forwarded tickets. */
739 retval = krb5_auth_con_setflags( context, *auth_context, KRB5_AUTH_CONTEXT_USE_SUBKEY);
740 if (retval) {
741 DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_setflags failed (%s)\n",
742 error_message(retval)));
743 goto cleanup_creds;
744 }
745
746 retval = ads_krb5_get_fwd_ticket( context,
747 auth_context,
748 credsp,
749 ccache,
750 &in_data );
751 if (retval) {
752 DEBUG( 1, ("ads_krb5_get_fwd_ticket failed (%s)\n",
753 error_message( retval ) ) );
754 goto cleanup_creds;
755 }
756 }
757 #endif
758
759 retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
760 &in_data, credsp, outbuf);
761 if (retval) {
762 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
763 error_message(retval)));
764 }
765
766 if (in_data.data) {
767 free( in_data.data );
768 in_data.length = 0;
769 }
770
771 krb5_free_creds(context, credsp);
772
773 cleanup_creds:
774 krb5_free_cred_contents(context, &creds);
775
776 cleanup_princ:
777 krb5_free_principal(context, server);
778
779 return retval;
780 }
781
782 /*
783 get a kerberos5 ticket for the given service
784 */
785 int cli_krb5_get_ticket(const char *principal, time_t time_offset,
786 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
787 uint32 extra_ap_opts, const char *ccname,
788 time_t *tgs_expire)
789
790 {
791 krb5_error_code retval;
792 krb5_data packet;
793 krb5_context context = NULL;
794 krb5_ccache ccdef = NULL;
795 krb5_auth_context auth_context = NULL;
796 krb5_enctype enc_types[] = {
797 #ifdef ENCTYPE_ARCFOUR_HMAC
798 ENCTYPE_ARCFOUR_HMAC,
799 #endif
800 ENCTYPE_DES_CBC_MD5,
801 ENCTYPE_DES_CBC_CRC,
802 ENCTYPE_NULL};
803
804 initialize_krb5_error_table();
805 retval = krb5_init_context(&context);
806 if (retval) {
807 DEBUG(1,("cli_krb5_get_ticket: krb5_init_context failed (%s)\n",
808 error_message(retval)));
809 goto failed;
810 }
811
812 if (time_offset != 0) {
813 krb5_set_real_time(context, time(NULL) + time_offset, 0);
814 }
815
816 if ((retval = krb5_cc_resolve(context, ccname ?
817 ccname : krb5_cc_default_name(context), &ccdef))) {
818 DEBUG(1,("cli_krb5_get_ticket: krb5_cc_default failed (%s)\n",
819 error_message(retval)));
820 goto failed;
821 }
822
823 if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
824 DEBUG(1,("cli_krb5_get_ticket: krb5_set_default_tgs_ktypes failed (%s)\n",
825 error_message(retval)));
826 goto failed;
827 }
828
829 if ((retval = ads_krb5_mk_req(context,
830 &auth_context,
831 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
832 principal,
833 ccdef, &packet,
834 tgs_expire))) {
835 goto failed;
836 }
837
838 get_krb5_smb_session_key(context, auth_context, session_key_krb5, False);
839
840 *ticket = data_blob(packet.data, packet.length);
841
842 kerberos_free_data_contents(context, &packet);
843
844 failed:
845
846 if ( context ) {
847 if (ccdef)
848 krb5_cc_close(context, ccdef);
849 if (auth_context)
850 krb5_auth_con_free(context, auth_context);
851 krb5_free_context(context);
852 }
853
854 return retval;
855 }
856
857 bool get_krb5_smb_session_key(krb5_context context, krb5_auth_context auth_context, DATA_BLOB *session_key, bool remote)
858 {
859 krb5_keyblock *skey;
860 krb5_error_code err;
861 bool ret = False;
862
863 if (remote)
864 err = krb5_auth_con_getremotesubkey(context, auth_context, &skey);
865 else
866 err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey);
867 if (err == 0 && skey != NULL) {
868 DEBUG(10, ("Got KRB5 session key of length %d\n", (int)KRB5_KEY_LENGTH(skey)));
869 *session_key = data_blob(KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
870 dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
871
872 ret = True;
873
874 krb5_free_keyblock(context, skey);
875 } else {
876 DEBUG(10, ("KRB5 error getting session key %d\n", err));
877 }
878
879 return ret;
880 }
881
882
883 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
884 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
885
886 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
887 {
888 static krb5_data kdata;
889
890 kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
891 kdata.length = strlen((const char *)kdata.data);
892 return &kdata;
893 }
894 #endif
895
896 krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
897 {
898 #if defined(HAVE_KRB5_KT_FREE_ENTRY)
899 return krb5_kt_free_entry(context, kt_entry);
900 #elif defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
901 return krb5_free_keytab_entry_contents(context, kt_entry);
902 #else
903 #error UNKNOWN_KT_FREE_FUNCTION
904 #endif
905 }
906
907 void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
908 struct PAC_SIGNATURE_DATA *sig)
909 {
910 #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
911 cksum->cksumtype = (krb5_cksumtype)sig->type;
912 cksum->checksum.length = sig->signature.length;
913 cksum->checksum.data = sig->signature.data;
914 #else
915 cksum->checksum_type = (krb5_cksumtype)sig->type;
916 cksum->length = sig->signature.length;
917 cksum->contents = sig->signature.data;
918 #endif
919 }
920
921 krb5_error_code smb_krb5_verify_checksum(krb5_context context,
922 const krb5_keyblock *keyblock,
923 krb5_keyusage usage,
924 krb5_checksum *cksum,
925 uint8 *data,
926 size_t length)
927 {
928 krb5_error_code ret;
929
930 /* verify the checksum */
931
932 /* welcome to the wonderful world of samba's kerberos abstraction layer:
933 *
934 * function heimdal 0.6.1rc3 heimdal 0.7 MIT krb 1.4.2
935 * -----------------------------------------------------------------------------
936 * krb5_c_verify_checksum - works works
937 * krb5_verify_checksum works (6 args) works (6 args) broken (7 args)
938 */
939
940 #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
941 {
942 krb5_boolean checksum_valid = False;
943 krb5_data input;
944
945 input.data = (char *)data;
946 input.length = length;
947
948 ret = krb5_c_verify_checksum(context,
949 keyblock,
950 usage,
951 &input,
952 cksum,
953 &checksum_valid);
954 if (ret) {
955 DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
956 error_message(ret)));
957 return ret;
958 }
959
960 if (!checksum_valid)
961 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
962 }
963
964 #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
965
966 /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
967 * without enctype and it ignores any key_usage types - Guenther */
968
969 {
970
971 krb5_crypto crypto;
972 ret = krb5_crypto_init(context,
973 keyblock,
974 0,
975 &crypto);
976 if (ret) {
977 DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
978 error_message(ret)));
979 return ret;
980 }
981
982 ret = krb5_verify_checksum(context,
983 crypto,
984 usage,
985 data,
986 length,
987 cksum);
988
989 krb5_crypto_destroy(context, crypto);
990 }
991
992 #else
993 #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
994 #endif
995
996 return ret;
997 }
998
999 time_t get_authtime_from_tkt(krb5_ticket *tkt)
1000 {
1001 #if defined(HAVE_KRB5_TKT_ENC_PART2)
1002 return tkt->enc_part2->times.authtime;
1003 #else
1004 return tkt->ticket.authtime;
1005 #endif
1006 }
1007
1008 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1009 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
1010 {
1011 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
1012 if (ap_req->ticket->enc_part.kvno)
1013 return ap_req->ticket->enc_part.kvno;
1014 #else /* Heimdal */
1015 if (ap_req->ticket.enc_part.kvno)
1016 return *ap_req->ticket.enc_part.kvno;
1017 #endif
1018 return 0;
1019 }
1020
1021 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
1022 {
1023 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
1024 return ap_req->ticket.enc_part.etype;
1025 #else /* MIT */
1026 return ap_req->ticket->enc_part.enctype;
1027 #endif
1028 }
1029 #endif /* HAVE_KRB5_DECODE_AP_REQ */
1030
1031 static krb5_error_code
1032 get_key_from_keytab(krb5_context context,
1033 krb5_const_principal server,
1034 krb5_enctype enctype,
1035 krb5_kvno kvno,
1036 krb5_keyblock **out_key)
1037 {
1038 krb5_keytab_entry entry;
1039 krb5_error_code ret;
1040 krb5_keytab keytab;
1041 char *name = NULL;
1042 krb5_keyblock *keyp;
1043
1044 /* We have to open a new keytab handle here, as MIT does
1045 an implicit open/getnext/close on krb5_kt_get_entry. We
1046 may be in the middle of a keytab enumeration when this is
1047 called. JRA. */
1048
1049 ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1050 if (ret) {
1051 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1052 return ret;
1053 }
1054
1055 if ( DEBUGLEVEL >= 10 ) {
1056 if (smb_krb5_unparse_name(context, server, &name) == 0) {
1057 DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1058 kvno, enctype, name));
1059 SAFE_FREE(name);
1060 }
1061 }
1062
1063 ret = krb5_kt_get_entry(context,
1064 keytab,
1065 server,
1066 kvno,
1067 enctype,
1068 &entry);
1069
1070 if (ret) {
1071 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1072 goto out;
1073 }
1074
1075 keyp = KRB5_KT_KEY(&entry);
1076
1077 ret = krb5_copy_keyblock(context, keyp, out_key);
1078 if (ret) {
1079 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1080 goto out;
1081 }
1082
1083 smb_krb5_kt_free_entry(context, &entry);
1084
1085 out:
1086 krb5_kt_close(context, keytab);
1087 return ret;
1088 }
1089
1090 /* Prototypes */
1091
1092 krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1093 const krb5_data *inbuf,
1094 krb5_kvno *kvno,
1095 krb5_enctype *enctype)
1096 {
1097 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1098 {
1099 krb5_error_code ret;
1100 krb5_ap_req ap_req;
1101
1102 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1103 if (ret)
1104 return ret;
1105
1106 *kvno = get_kvno_from_ap_req(&ap_req);
1107 *enctype = get_enctype_from_ap_req(&ap_req);
1108
1109 free_AP_REQ(&ap_req);
1110 return 0;
1111 }
1112 #endif
1113
1114 /* Possibly not an appropriate error code. */
1115 return KRB5KDC_ERR_BADOPTION;
1116 }
1117
1118 krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1119 krb5_auth_context *auth_context,
1120 const krb5_data *inbuf,
1121 krb5_const_principal server,
1122 krb5_keytab keytab,
1123 krb5_flags *ap_req_options,
1124 krb5_ticket **ticket,
1125 krb5_keyblock **keyblock)
1126 {
1127 krb5_error_code ret;
1128 krb5_kvno kvno;
1129 krb5_enctype enctype;
1130 krb5_keyblock *local_keyblock;
1131
1132 ret = krb5_rd_req(context,
1133 auth_context,
1134 inbuf,
1135 server,
1136 keytab,
1137 ap_req_options,
1138 ticket);
1139 if (ret) {
1140 return ret;
1141 }
1142
1143 #ifdef KRB5_TICKET_HAS_KEYINFO
1144 enctype = (*ticket)->enc_part.enctype;
1145 kvno = (*ticket)->enc_part.kvno;
1146 #else
1147 ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1148 if (ret) {
1149 return ret;
1150 }
1151 #endif
1152
1153 ret = get_key_from_keytab(context,
1154 server,
1155 enctype,
1156 kvno,
1157 &local_keyblock);
1158 if (ret) {
1159 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1160 goto out;
1161 }
1162
1163 out:
1164 if (ret && local_keyblock != NULL) {
1165 krb5_free_keyblock(context, local_keyblock);
1166 } else {
1167 *keyblock = local_keyblock;
1168 }
1169
1170 return ret;
1171 }
1172
1173 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1174 const char *name,
1175 krb5_principal *principal)
1176 {
1177 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1178 return smb_krb5_parse_name_norealm_conv(context, name, principal);
1179 #endif
1180
1181 /* we are cheating here because parse_name will in fact set the realm.
1182 * We don't care as the only caller of smb_krb5_parse_name_norealm
1183 * ignores the realm anyway when calling
1184 * smb_krb5_principal_compare_any_realm later - Guenther */
1185
1186 return smb_krb5_parse_name(context, name, principal);
1187 }
1188
1189 bool smb_krb5_principal_compare_any_realm(krb5_context context,
1190 krb5_const_principal princ1,
1191 krb5_const_principal princ2)
1192 {
1193 #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1194
1195 return krb5_principal_compare_any_realm(context, princ1, princ2);
1196
1197 /* krb5_princ_size is a macro in MIT */
1198 #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1199
1200 int i, len1, len2;
1201 const krb5_data *p1, *p2;
1202
1203 len1 = krb5_princ_size(context, princ1);
1204 len2 = krb5_princ_size(context, princ2);
1205
1206 if (len1 != len2)
1207 return False;
1208
1209 for (i = 0; i < len1; i++) {
1210
1211 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1212 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1213
1214 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1215 return False;
1216 }
1217
1218 return True;
1219 #else
1220 #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1221 #endif
1222 }
1223
1224 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, /* FILE:/tmp/krb5cc_0 */
1225 const char *client_string, /* gd@BER.SUSE.DE */
1226 const char *service_string, /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1227 time_t *expire_time)
1228 {
1229 krb5_error_code ret;
1230 krb5_context context = NULL;
1231 krb5_ccache ccache = NULL;
1232 krb5_principal client = NULL;
1233 krb5_creds creds, creds_in, *creds_out = NULL;
1234
1235 ZERO_STRUCT(creds);
1236 ZERO_STRUCT(creds_in);
1237
1238 initialize_krb5_error_table();
1239 ret = krb5_init_context(&context);
1240 if (ret) {
1241 goto done;
1242 }
1243
1244 if (!ccache_string) {
1245 ccache_string = krb5_cc_default_name(context);
1246 }
1247
1248 if (!ccache_string) {
1249 ret = EINVAL;
1250 goto done;
1251 }
1252
1253 DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1254
1255 /* FIXME: we should not fall back to defaults */
1256 ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1257 if (ret) {
1258 goto done;
1259 }
1260
1261 if (client_string) {
1262 ret = smb_krb5_parse_name(context, client_string, &client);
1263 if (ret) {
1264 goto done;
1265 }
1266 } else {
1267 ret = krb5_cc_get_principal(context, ccache, &client);
1268 if (ret) {
1269 goto done;
1270 }
1271 }
1272
1273 #ifdef HAVE_KRB5_GET_RENEWED_CREDS /* MIT */
1274 {
1275 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1276 if (ret) {
1277 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1278 goto done;
1279 }
1280 }
1281 #elif defined(HAVE_KRB5_GET_KDC_CRED) /* Heimdal */
1282 {
1283 krb5_kdc_flags flags;
1284 krb5_realm *client_realm = NULL;
1285
1286 ret = krb5_copy_principal(context, client, &creds_in.client);
1287 if (ret) {
1288 goto done;
1289 }
1290
1291 if (service_string) {
1292 ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1293 if (ret) {
1294 goto done;
1295 }
1296 } else {
1297 /* build tgt service by default */
1298 client_realm = krb5_princ_realm(context, creds_in.client);
1299 if (!client_realm) {
1300 ret = ENOMEM;
1301 goto done;
1302 }
1303 ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1304 if (ret) {
1305 goto done;
1306 }
1307 }
1308
1309 flags.i = 0;
1310 flags.b.renewable = flags.b.renew = True;
1311
1312 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1313 if (ret) {
1314 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1315 goto done;
1316 }
1317
1318 creds = *creds_out;
1319 }
1320 #else
1321 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1322 #endif
1323
1324 /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1325 ret = krb5_cc_initialize(context, ccache, client);
1326 if (ret) {
1327 goto done;
1328 }
1329
1330 ret = krb5_cc_store_cred(context, ccache, &creds);
1331
1332 if (expire_time) {
1333 *expire_time = (time_t) creds.times.endtime;
1334 }
1335
1336 done:
1337 krb5_free_cred_contents(context, &creds_in);
1338
1339 if (creds_out) {
1340 krb5_free_creds(context, creds_out);
1341 } else {
1342 krb5_free_cred_contents(context, &creds);
1343 }
1344
1345 if (client) {
1346 krb5_free_principal(context, client);
1347 }
1348 if (ccache) {
1349 krb5_cc_close(context, ccache);
1350 }
1351 if (context) {
1352 krb5_free_context(context);
1353 }
1354
1355 return ret;
1356 }
1357
1358 krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1359 {
1360 krb5_error_code ret = 0;
1361 if (addr == NULL) {
1362 return ret;
1363 }
1364 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1365 krb5_free_addresses(context, addr->addrs);
1366 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1367 ret = krb5_free_addresses(context, addr->addrs);
1368 SAFE_FREE(addr->addrs);
1369 #endif
1370 SAFE_FREE(addr);
1371 addr = NULL;
1372 return ret;
1373 }
1374
1375 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1376 {
1377 krb5_error_code ret = 0;
1378 nstring buf;
1379 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1380 krb5_address **addrs = NULL;
1381 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1382 krb5_addresses *addrs = NULL;
1383 #endif
1384
1385 *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1386 if (*kerb_addr == NULL) {
1387 return ENOMEM;
1388 }
1389
1390 put_name(buf, global_myname(), ' ', 0x20);
1391
1392 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1393 {
1394 int num_addr = 2;
1395
1396 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1397 if (addrs == NULL) {
1398 SAFE_FREE(kerb_addr);
1399 return ENOMEM;
1400 }
1401
1402 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1403
1404 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1405 if (addrs[0] == NULL) {
1406 SAFE_FREE(addrs);
1407 SAFE_FREE(kerb_addr);
1408 return ENOMEM;
1409 }
1410
1411 addrs[0]->magic = KV5M_ADDRESS;
1412 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1413 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1414 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1415 if (addrs[0]->contents == NULL) {
1416 SAFE_FREE(addrs[0]);
1417 SAFE_FREE(addrs);
1418 SAFE_FREE(kerb_addr);
1419 return ENOMEM;
1420 }
1421
1422 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1423
1424 addrs[1] = NULL;
1425 }
1426 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1427 {
1428 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1429 if (addrs == NULL) {
1430 SAFE_FREE(kerb_addr);
1431 return ENOMEM;
1432 }
1433
1434 memset(addrs, 0, sizeof(krb5_addresses));
1435
1436 addrs->len = 1;
1437 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1438 if (addrs->val == NULL) {
1439 SAFE_FREE(addrs);
1440 SAFE_FREE(kerb_addr);
1441 return ENOMEM;
1442 }
1443
1444 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1445 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1446 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1447 if (addrs->val[0].address.data == NULL) {
1448 SAFE_FREE(addrs->val);
1449 SAFE_FREE(addrs);
1450 SAFE_FREE(kerb_addr);
1451 return ENOMEM;
1452 }
1453
1454 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1455 }
1456 #else
1457 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1458 #endif
1459 (*kerb_addr)->addrs = addrs;
1460
1461 return ret;
1462 }
1463
1464 void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1465 {
1466 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1467 krb5_free_error_contents(context, krberror);
1468 #else /* MIT */
1469 krb5_free_error(context, krberror);
1470 #endif
1471 }
1472
1473 krb5_error_code handle_krberror_packet(krb5_context context,
1474 krb5_data *packet)
1475 {
1476 krb5_error_code ret;
1477 bool got_error_code = False;
1478
1479 DEBUG(10,("handle_krberror_packet: got error packet\n"));
1480
1481 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1482 {
1483 krb5_error krberror;
1484
1485 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1486 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1487 error_message(ret)));
1488 return ret;
1489 }
1490
1491 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1492 ret = (krb5_error_code) krberror.error_code;
1493 got_error_code = True;
1494 }
1495
1496 smb_krb5_free_error(context, &krberror);
1497 }
1498 #else /* MIT */
1499 {
1500 krb5_error *krberror;
1501
1502 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1503 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1504 error_message(ret)));
1505 return ret;
1506 }
1507
1508 if (krberror->e_data.data == NULL) {
1509 ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1510 got_error_code = True;
1511 }
1512 smb_krb5_free_error(context, krberror);
1513 }
1514 #endif
1515 if (got_error_code) {
1516 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1517 error_message(ret), ret));
1518 }
1519 return ret;
1520 }
1521
1522 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1523 krb5_get_init_creds_opt **opt)
1524 {
1525 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1526 /* Heimdal or modern MIT version */
1527 return krb5_get_init_creds_opt_alloc(context, opt);
1528 #else
1529 /* Historical MIT version */
1530 krb5_get_init_creds_opt *my_opt;
1531
1532 *opt = NULL;
1533
1534 if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1535 return ENOMEM;
1536 }
1537
1538 krb5_get_init_creds_opt_init(my_opt);
1539
1540 *opt = my_opt;
1541 return 0;
1542 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC */
1543 }
1544
1545 void smb_krb5_get_init_creds_opt_free(krb5_context context,
1546 krb5_get_init_creds_opt *opt)
1547 {
1548 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1549
1550 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1551 /* Modern MIT or Heimdal version */
1552 krb5_get_init_creds_opt_free(context, opt);
1553 #else
1554 /* Heimdal version */
1555 krb5_get_init_creds_opt_free(opt);
1556 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1557
1558 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1559 /* Historical MIT version */
1560 SAFE_FREE(opt);
1561 opt = NULL;
1562 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1563 }
1564
1565 krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1566 {
1567 return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1568 }
1569
1570
1571 /* caller needs to free etype_s */
1572 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1573 krb5_enctype enctype,
1574 char **etype_s)
1575 {
1576 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1577 return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1578 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1579 char buf[256];
1580 krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1581 if (ret) {
1582 return ret;
1583 }
1584 *etype_s = SMB_STRDUP(buf);
1585 if (!*etype_s) {
1586 return ENOMEM;
1587 }
1588 return ret;
1589 #else
1590 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1591 #endif
1592 }
1593
1594 krb5_error_code smb_krb5_mk_error(krb5_context context,
1595 krb5_error_code error_code,
1596 const krb5_principal server,
1597 krb5_data *reply)
1598 {
1599 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1600 /*
1601 * The MIT interface is *terrible*.
1602 * We have to construct this ourselves...
1603 */
1604 krb5_error e;
1605
1606 memset(&e, 0, sizeof(e));
1607 krb5_us_timeofday(context, &e.stime, &e.susec);
1608 e.server = server;
1609 #if defined(krb5_err_base)
1610 e.error = error_code - krb5_err_base;
1611 #elif defined(ERROR_TABLE_BASE_krb5)
1612 e.error = error_code - ERROR_TABLE_BASE_krb5;
1613 #else
1614 e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1615 #endif
1616
1617 return krb5_mk_error(context, &e, reply);
1618 #else /* Heimdal. */
1619 return krb5_mk_error(context,
1620 error_code,
1621 NULL,
1622 NULL, /* e_data */
1623 NULL,
1624 server,
1625 NULL,
1626 NULL,
1627 reply);
1628 #endif
1629 }
1630
1631 /**********************************************************************
1632 * Open a krb5 keytab with flags, handles readonly or readwrite access and
1633 * allows to process non-default keytab names.
1634 * @param context krb5_context
1635 * @param keytab_name_req string
1636 * @param write_access bool if writable keytab is required
1637 * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1638 * @return krb5_error_code
1639 **********************************************************************/
1640
1641 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1642 #ifndef MAX_KEYTAB_NAME_LEN
1643 #define MAX_KEYTAB_NAME_LEN 1100
1644 #endif
1645
1646 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1647 const char *keytab_name_req,
1648 bool write_access,
1649 krb5_keytab *keytab)
1650 {
1651 krb5_error_code ret = 0;
1652 TALLOC_CTX *mem_ctx;
1653 char keytab_string[MAX_KEYTAB_NAME_LEN];
1654 char *kt_str = NULL;
1655 bool found_valid_name = False;
1656 const char *pragma = "FILE";
1657 const char *tmp = NULL;
1658
1659 if (!write_access && !keytab_name_req) {
1660 /* caller just wants to read the default keytab readonly, so be it */
1661 return krb5_kt_default(context, keytab);
1662 }
1663
1664 mem_ctx = talloc_init("smb_krb5_open_keytab");
1665 if (!mem_ctx) {
1666 return ENOMEM;
1667 }
1668
1669 #ifdef HAVE_WRFILE_KEYTAB
1670 if (write_access) {
1671 pragma = "WRFILE";
1672 }
1673 #endif
1674
1675 if (keytab_name_req) {
1676
1677 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1678 ret = KRB5_CONFIG_NOTENUFSPACE;
1679 goto out;
1680 }
1681
1682 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1683 (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1684 tmp = keytab_name_req;
1685 goto resolve;
1686 }
1687
1688 if (keytab_name_req[0] != '/') {
1689 ret = KRB5_KT_BADNAME;
1690 goto out;
1691 }
1692
1693 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1694 if (!tmp) {
1695 ret = ENOMEM;
1696 goto out;
1697 }
1698
1699 goto resolve;
1700 }
1701
1702 /* we need to handle more complex keytab_strings, like:
1703 * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1704
1705 ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1706 if (ret) {
1707 goto out;
1708 }
1709
1710 DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1711
1712 tmp = talloc_strdup(mem_ctx, keytab_string);
1713 if (!tmp) {
1714 ret = ENOMEM;
1715 goto out;
1716 }
1717
1718 if (strncmp(tmp, "ANY:", 4) == 0) {
1719 tmp += 4;
1720 }
1721
1722 memset(&keytab_string, '\0', sizeof(keytab_string));
1723
1724 while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1725 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1726 found_valid_name = True;
1727 tmp = kt_str;
1728 tmp += 7;
1729 }
1730
1731 if (strncmp(kt_str, "FILE:", 5) == 0) {
1732 found_valid_name = True;
1733 tmp = kt_str;
1734 tmp += 5;
1735 }
1736
1737 if (found_valid_name) {
1738 if (tmp[0] != '/') {
1739 ret = KRB5_KT_BADNAME;
1740 goto out;
1741 }
1742
1743 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1744 if (!tmp) {
1745 ret = ENOMEM;
1746 goto out;
1747 }
1748 break;
1749 }
1750 }
1751
1752 if (!found_valid_name) {
1753 ret = KRB5_KT_UNKNOWN_TYPE;
1754 goto out;
1755 }
1756
1757 resolve:
1758 DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1759 ret = krb5_kt_resolve(context, tmp, keytab);
1760
1761 out:
1762 TALLOC_FREE(mem_ctx);
1763 return ret;
1764 }
1765
1766 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1767 krb5_context context,
1768 krb5_keytab keytab,
1769 const char **keytab_name)
1770 {
1771 char keytab_string[MAX_KEYTAB_NAME_LEN];
1772 krb5_error_code ret = 0;
1773
1774 ret = krb5_kt_get_name(context, keytab,
1775 keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1776 if (ret) {
1777 return ret;
1778 }
1779
1780 *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1781 if (!*keytab_name) {
1782 return ENOMEM;
1783 }
1784
1785 return ret;
1786 }
1787
1788 #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)
1789 /**************************************************************
1790 Routine: ads_krb5_get_fwd_ticket
1791 Description:
1792 When a service ticket is flagged as trusted
1793 for delegation we should provide a forwardable
1794 ticket so that the remote host can act on our
1795 behalf. This is done by taking the 2nd forwardable
1796 TGT and storing it in the GSS-API authenticator
1797 "checksum". This routine will populate
1798 the krb5_data authenticator with this TGT.
1799 Parameters:
1800 krb5_context context: The kerberos context for this authentication.
1801 krb5_auth_context: The authentication context.
1802 krb5_creds *credsp: The ticket credentials (AS-REP).
1803 krb5_ccache ccache: The credentials cache.
1804 krb5_data &authenticator: The checksum field that will store the TGT, and
1805 authenticator.data must be freed by the caller.
1806
1807 Returns:
1808 krb5_error_code: 0 if no errors, otherwise set.
1809 **************************************************************/
1810
1811 static krb5_error_code ads_krb5_get_fwd_ticket( krb5_context context,
1812 krb5_auth_context *auth_context,
1813 krb5_creds *credsp,
1814 krb5_ccache ccache,
1815 krb5_data *authenticator)
1816 {
1817 krb5_data fwdData;
1818 krb5_error_code retval = 0;
1819 char *pChksum = NULL;
1820 char *p = NULL;
1821
1822 ZERO_STRUCT(fwdData);
1823 ZERO_STRUCTP(authenticator);
1824
1825 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
1826 *auth_context, /* Authentication context [in] */
1827 CONST_DISCARD(char *, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
1828 credsp->client, /* Client principal for the tgt [in] */
1829 credsp->server, /* Server principal for the tgt [in] */
1830 ccache, /* Credential cache to use for storage [in] */
1831 1, /* Turn on for "Forwardable ticket" [in] */
1832 &fwdData ); /* Resulting response [out] */
1833
1834
1835 if (retval) {
1836 DEBUG(1,("ads_krb5_get_fwd_ticket: krb5_fwd_tgt_creds failed (%s)\n",
1837 error_message(retval)));
1838 goto out;
1839 }
1840
1841 if ((unsigned int)GSSAPI_CHECKSUM_SIZE + (unsigned int)fwdData.length <
1842 (unsigned int)GSSAPI_CHECKSUM_SIZE) {
1843 retval = EINVAL;
1844 goto out;
1845 }
1846
1847 /* We're going to allocate a gssChecksum structure with a little
1848 extra data the length of the kerberos credentials length
1849 (APPLICATION 22) so that we can pack it on the end of the structure.
1850 */
1851
1852 pChksum = (char *)SMB_MALLOC(GSSAPI_CHECKSUM_SIZE + fwdData.length );
1853 if (!pChksum) {
1854 retval = ENOMEM;
1855 goto out;
1856 }
1857
1858 p = pChksum;
1859
1860 SIVAL(p, 0, GSSAPI_BNDLENGTH);
1861 p += 4;
1862
1863 /* Zero out the bindings fields */
1864 memset(p, '\0', GSSAPI_BNDLENGTH );
1865 p += GSSAPI_BNDLENGTH;
1866
1867 SIVAL(p, 0, GSS_C_DELEG_FLAG );
1868 p += 4;
1869 SSVAL(p, 0, 1 );
1870 p += 2;
1871 SSVAL(p, 0, fwdData.length );
1872 p += 2;
1873
1874 /* Migrate the kerberos KRB_CRED data to the checksum delegation */
1875 memcpy(p, fwdData.data, fwdData.length );
1876 p += fwdData.length;
1877
1878 /* We need to do this in order to allow our GSS-API */
1879 retval = krb5_auth_con_set_req_cksumtype( context, *auth_context, GSSAPI_CHECKSUM );
1880 if (retval) {
1881 goto out;
1882 }
1883
1884 /* We now have a service ticket, now turn it into an AP-REQ. */
1885 authenticator->length = fwdData.length + GSSAPI_CHECKSUM_SIZE;
1886
1887 /* Caller should call free() when they're done with this. */
1888 authenticator->data = (char *)pChksum;
1889
1890 out:
1891
1892 /* Remove that input data, we never needed it anyway. */
1893 if (fwdData.length > 0) {
1894 krb5_free_data_contents( context, &fwdData );
1895 }
1896
1897 return retval;
1898 }
1899 #endif
1900
1901 #else /* HAVE_KRB5 */
1902 /* this saves a few linking headaches */
1903 int cli_krb5_get_ticket(const char *principal, time_t time_offset,
1904 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, uint32 extra_ap_opts,
1905 const char *ccname, time_t *tgs_expire)
1906 {
1907 DEBUG(0,("NO KERBEROS SUPPORT\n"));
1908 return 1;
1909 }
1910
1911 #endif
reg import