?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
s3-krb5: Fix Coverity #722 (RESOURCE_LEAK).
[Samba.git] / source / libsmb / clikrb5.c
blob007fd8de7c40a2ca6360beef190bd66a0aa351ef
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 #ifdef HAVE_KRB5_KEYBLOCK_KEYVALUE /* Heimdal */
31 #define KRB5_KEY_TYPE(k) ((k)->keytype)
32 #define KRB5_KEY_LENGTH(k) ((k)->keyvalue.length)
33 #define KRB5_KEY_DATA(k) ((k)->keyvalue.data)
34 #else /* MIT */
35 #define KRB5_KEY_TYPE(k) ((k)->enctype)
36 #define KRB5_KEY_LENGTH(k) ((k)->length)
37 #define KRB5_KEY_DATA(k) ((k)->contents)
38 #endif /* HAVE_KRB5_KEYBLOCK_KEYVALUE */
39
40 #define GSSAPI_CHECKSUM 0x8003 /* Checksum type value for Kerberos */
41 #define GSSAPI_BNDLENGTH 16 /* Bind Length (rfc-1964 pg.3) */
42 #define GSSAPI_CHECKSUM_SIZE (12+GSSAPI_BNDLENGTH)
43
44 #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)
45 static krb5_error_code ads_krb5_get_fwd_ticket( krb5_context context,
46 krb5_auth_context *auth_context,
47 krb5_creds *credsp,
48 krb5_ccache ccache,
49 krb5_data *authenticator);
50 #endif
51
52 /**************************************************************
53 Wrappers around kerberos string functions that convert from
54 utf8 -> unix charset and vica versa.
55 **************************************************************/
56
57 /**************************************************************
58 krb5_parse_name that takes a UNIX charset.
59 **************************************************************/
60
61 krb5_error_code smb_krb5_parse_name(krb5_context context,
62 const char *name, /* in unix charset */
63 krb5_principal *principal)
64 {
65 krb5_error_code ret;
66 char *utf8_name;
67
68 if (push_utf8_allocate(&utf8_name, name) == (size_t)-1) {
69 return ENOMEM;
70 }
71
72 ret = krb5_parse_name(context, utf8_name, principal);
73 SAFE_FREE(utf8_name);
74 return ret;
75 }
76
77 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
78 /**************************************************************
79 krb5_parse_name_norealm that takes a UNIX charset.
80 **************************************************************/
81
82 static krb5_error_code smb_krb5_parse_name_norealm_conv(krb5_context context,
83 const char *name, /* in unix charset */
84 krb5_principal *principal)
85 {
86 krb5_error_code ret;
87 char *utf8_name;
88
89 *principal = NULL;
90 if (push_utf8_allocate(&utf8_name, name) == (size_t)-1) {
91 return ENOMEM;
92 }
93
94 ret = krb5_parse_name_norealm(context, utf8_name, principal);
95 SAFE_FREE(utf8_name);
96 return ret;
97 }
98 #endif
99
100 /**************************************************************
101 krb5_parse_name that returns a UNIX charset name. Must
102 be freed with normal free() call.
103 **************************************************************/
104
105 krb5_error_code smb_krb5_unparse_name(krb5_context context,
106 krb5_const_principal principal,
107 char **unix_name)
108 {
109 krb5_error_code ret;
110 char *utf8_name;
111
112 *unix_name = NULL;
113 ret = krb5_unparse_name(context, principal, &utf8_name);
114 if (ret) {
115 return ret;
116 }
117
118 if (pull_utf8_allocate(unix_name, utf8_name)==-1) {
119 krb5_free_unparsed_name(context, utf8_name);
120 return ENOMEM;
121 }
122 krb5_free_unparsed_name(context, utf8_name);
123 return 0;
124 }
125
126 #ifndef HAVE_KRB5_SET_REAL_TIME
127 /*
128 * This function is not in the Heimdal mainline.
129 */
130 krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds)
131 {
132 krb5_error_code ret;
133 int32_t sec, usec;
134
135 ret = krb5_us_timeofday(context, &sec, &usec);
136 if (ret)
137 return ret;
138
139 context->kdc_sec_offset = seconds - sec;
140 context->kdc_usec_offset = microseconds - usec;
141
142 return 0;
143 }
144 #endif
145
146 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
147
148 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
149
150 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
151 * to krb5_set_default_tgs_ktypes. See
152 * http://lists.samba.org/archive/samba-technical/2006-July/048271.html
153 *
154 * If the MIT libraries are not exporting internal symbols, we will end up in
155 * this branch, which is correct. Otherwise we will continue to use the
156 * internal symbol
157 */
158 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
159 {
160 return krb5_set_default_tgs_enctypes(ctx, enc);
161 }
162
163 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
164
165 /* Heimdal */
166 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
167 {
168 return krb5_set_default_in_tkt_etypes(ctx, enc);
169 }
170
171 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
172
173 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
174
175 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
176 /* HEIMDAL */
177 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
178 {
179 memset(pkaddr, '\0', sizeof(krb5_address));
180 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
181 if (paddr->ss_family == AF_INET6) {
182 pkaddr->addr_type = KRB5_ADDRESS_INET6;
183 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
184 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
185 return true;
186 }
187 #endif
188 if (paddr->ss_family == AF_INET) {
189 pkaddr->addr_type = KRB5_ADDRESS_INET;
190 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
191 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
192 return true;
193 }
194 return false;
195 }
196 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
197 /* MIT */
198 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
199 {
200 memset(pkaddr, '\0', sizeof(krb5_address));
201 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
202 if (paddr->ss_family == AF_INET6) {
203 pkaddr->addrtype = ADDRTYPE_INET6;
204 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
205 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
206 return true;
207 }
208 #endif
209 if (paddr->ss_family == AF_INET) {
210 pkaddr->addrtype = ADDRTYPE_INET;
211 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
212 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
213 return true;
214 }
215 return false;
216 }
217 #else
218 #error UNKNOWN_ADDRTYPE
219 #endif
220
221 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY) && defined(HAVE_KRB5_ENCRYPT_BLOCK)
222 int create_kerberos_key_from_string_direct(krb5_context context,
223 krb5_principal host_princ,
224 krb5_data *password,
225 krb5_keyblock *key,
226 krb5_enctype enctype)
227 {
228 int ret;
229 krb5_data salt;
230 krb5_encrypt_block eblock;
231
232 ret = krb5_principal2salt(context, host_princ, &salt);
233 if (ret) {
234 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
235 return ret;
236 }
237 krb5_use_enctype(context, &eblock, enctype);
238 ret = krb5_string_to_key(context, &eblock, key, password, &salt);
239 SAFE_FREE(salt.data);
240 return ret;
241 }
242 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
243 int create_kerberos_key_from_string_direct(krb5_context context,
244 krb5_principal host_princ,
245 krb5_data *password,
246 krb5_keyblock *key,
247 krb5_enctype enctype)
248 {
249 int ret;
250 krb5_salt salt;
251
252 ret = krb5_get_pw_salt(context, host_princ, &salt);
253 if (ret) {
254 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
255 return ret;
256 }
257
258 ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
259 krb5_free_salt(context, salt);
260 return ret;
261 }
262 #else
263 #error UNKNOWN_CREATE_KEY_FUNCTIONS
264 #endif
265
266 int create_kerberos_key_from_string(krb5_context context,
267 krb5_principal host_princ,
268 krb5_data *password,
269 krb5_keyblock *key,
270 krb5_enctype enctype)
271 {
272 krb5_principal salt_princ = NULL;
273 int ret;
274 /*
275 * Check if we've determined that the KDC is salting keys for this
276 * principal/enctype in a non-obvious way. If it is, try to match
277 * its behavior.
278 */
279 salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype);
280 ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype);
281 if (salt_princ) {
282 krb5_free_principal(context, salt_princ);
283 }
284 return ret;
285 }
286
287 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
288 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
289 krb5_enctype **enctypes)
290 {
291 return krb5_get_permitted_enctypes(context, enctypes);
292 }
293 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
294 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
295 krb5_enctype **enctypes)
296 {
297 return krb5_get_default_in_tkt_etypes(context, enctypes);
298 }
299 #else
300 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
301 #endif
302
303 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
304 krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
305 krb5_auth_context auth_context,
306 krb5_keyblock *keyblock)
307 {
308 return krb5_auth_con_setkey(context, auth_context, keyblock);
309 }
310 #endif
311
312 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
313 DATA_BLOB *edata,
314 DATA_BLOB *edata_out)
315 {
316 DATA_BLOB edata_contents;
317 ASN1_DATA data;
318 int edata_type;
319
320 if (!edata->length) {
321 return False;
322 }
323
324 asn1_load(&data, *edata);
325 asn1_start_tag(&data, ASN1_SEQUENCE(0));
326 asn1_start_tag(&data, ASN1_CONTEXT(1));
327 asn1_read_Integer(&data, &edata_type);
328
329 if (edata_type != KRB5_PADATA_PW_SALT) {
330 DEBUG(0,("edata is not of required type %d but of type %d\n",
331 KRB5_PADATA_PW_SALT, edata_type));
332 asn1_free(&data);
333 return False;
334 }
335
336 asn1_start_tag(&data, ASN1_CONTEXT(2));
337 asn1_read_OctetString(&data, &edata_contents);
338 asn1_end_tag(&data);
339 asn1_end_tag(&data);
340 asn1_end_tag(&data);
341 asn1_free(&data);
342
343 *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
344
345 data_blob_free(&edata_contents);
346
347 return True;
348 }
349
350
351 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
352 {
353 DATA_BLOB pac_contents;
354 ASN1_DATA data;
355 int data_type;
356
357 if (!auth_data->length) {
358 return False;
359 }
360
361 asn1_load(&data, *auth_data);
362 asn1_start_tag(&data, ASN1_SEQUENCE(0));
363 asn1_start_tag(&data, ASN1_SEQUENCE(0));
364 asn1_start_tag(&data, ASN1_CONTEXT(0));
365 asn1_read_Integer(&data, &data_type);
366
367 if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) {
368 DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type));
369 asn1_free(&data);
370 return False;
371 }
372
373 asn1_end_tag(&data);
374 asn1_start_tag(&data, ASN1_CONTEXT(1));
375 asn1_read_OctetString(&data, &pac_contents);
376 asn1_end_tag(&data);
377 asn1_end_tag(&data);
378 asn1_end_tag(&data);
379 asn1_free(&data);
380
381 *unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length);
382
383 data_blob_free(&pac_contents);
384
385 return True;
386 }
387
388 bool get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt)
389 {
390 DATA_BLOB auth_data_wrapped;
391 bool got_auth_data_pac = False;
392 int i;
393
394 #if defined(HAVE_KRB5_TKT_ENC_PART2)
395 if (tkt->enc_part2 && tkt->enc_part2->authorization_data &&
396 tkt->enc_part2->authorization_data[0] &&
397 tkt->enc_part2->authorization_data[0]->length)
398 {
399 for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) {
400
401 if (tkt->enc_part2->authorization_data[i]->ad_type !=
402 KRB5_AUTHDATA_IF_RELEVANT) {
403 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
404 tkt->enc_part2->authorization_data[i]->ad_type));
405 continue;
406 }
407
408 auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents,
409 tkt->enc_part2->authorization_data[i]->length);
410
411 /* check if it is a PAC */
412 got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
413 data_blob_free(&auth_data_wrapped);
414
415 if (got_auth_data_pac) {
416 return true;
417 }
418 }
419
420 return got_auth_data_pac;
421 }
422
423 #else
424 if (tkt->ticket.authorization_data &&
425 tkt->ticket.authorization_data->len)
426 {
427 for (i = 0; i < tkt->ticket.authorization_data->len; i++) {
428
429 if (tkt->ticket.authorization_data->val[i].ad_type !=
430 KRB5_AUTHDATA_IF_RELEVANT) {
431 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
432 tkt->ticket.authorization_data->val[i].ad_type));
433 continue;
434 }
435
436 auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data,
437 tkt->ticket.authorization_data->val[i].ad_data.length);
438
439 /* check if it is a PAC */
440 got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
441 data_blob_free(&auth_data_wrapped);
442
443 if (got_auth_data_pac) {
444 return true;
445 }
446 }
447
448 return got_auth_data_pac;
449 }
450 #endif
451 return False;
452 }
453
454 krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
455 {
456 #if defined(HAVE_KRB5_TKT_ENC_PART2)
457 return tkt->enc_part2->client;
458 #else
459 return tkt->client;
460 #endif
461 }
462
463 #if !defined(HAVE_KRB5_LOCATE_KDC)
464
465 /* krb5_locate_kdc is an internal MIT symbol. MIT are not yet willing to commit
466 * to a public interface for this functionality, so we have to be able to live
467 * without it if the MIT libraries are hiding their internal symbols.
468 */
469
470 #if defined(KRB5_KRBHST_INIT)
471 /* Heimdal */
472 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters)
473 {
474 krb5_krbhst_handle hnd;
475 krb5_krbhst_info *hinfo;
476 krb5_error_code rc;
477 int num_kdcs, i;
478 struct sockaddr *sa;
479 struct addrinfo *ai;
480
481 *addr_pp = NULL;
482 *naddrs = 0;
483
484 rc = krb5_krbhst_init(ctx, realm->data, KRB5_KRBHST_KDC, &hnd);
485 if (rc) {
486 DEBUG(0, ("smb_krb5_locate_kdc: krb5_krbhst_init failed (%s)\n", error_message(rc)));
487 return rc;
488 }
489
490 for ( num_kdcs = 0; (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); num_kdcs++)
491 ;
492
493 krb5_krbhst_reset(ctx, hnd);
494
495 if (!num_kdcs) {
496 DEBUG(0, ("smb_krb5_locate_kdc: zero kdcs found !\n"));
497 krb5_krbhst_free(ctx, hnd);
498 return -1;
499 }
500
501 sa = SMB_MALLOC_ARRAY( struct sockaddr, num_kdcs );
502 if (!sa) {
503 DEBUG(0, ("smb_krb5_locate_kdc: malloc failed\n"));
504 krb5_krbhst_free(ctx, hnd);
505 naddrs = 0;
506 return -1;
507 }
508
509 memset(sa, '\0', sizeof(struct sockaddr) * num_kdcs );
510
511 for (i = 0; i < num_kdcs && (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); i++) {
512
513 #if defined(HAVE_KRB5_KRBHST_GET_ADDRINFO)
514 rc = krb5_krbhst_get_addrinfo(ctx, hinfo, &ai);
515 if (rc) {
516 DEBUG(0,("krb5_krbhst_get_addrinfo failed: %s\n", error_message(rc)));
517 continue;
518 }
519 #endif
520 if (hinfo->ai && hinfo->ai->ai_family == AF_INET)
521 memcpy(&sa[i], hinfo->ai->ai_addr, sizeof(struct sockaddr));
522 }
523
524 krb5_krbhst_free(ctx, hnd);
525
526 *naddrs = num_kdcs;
527 *addr_pp = sa;
528 return 0;
529 }
530
531 #else /* ! defined(KRB5_KRBHST_INIT) */
532
533 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
534 struct sockaddr **addr_pp, int *naddrs, int get_masters)
535 {
536 DEBUG(0, ("unable to explicitly locate the KDC on this platform\n"));
537 return KRB5_KDC_UNREACH;
538 }
539
540 #endif /* KRB5_KRBHST_INIT */
541
542 #else /* ! HAVE_KRB5_LOCATE_KDC */
543
544 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
545 struct sockaddr **addr_pp, int *naddrs, int get_masters)
546 {
547 return krb5_locate_kdc(ctx, realm, addr_pp, naddrs, get_masters);
548 }
549
550 #endif /* HAVE_KRB5_LOCATE_KDC */
551
552 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
553 void krb5_free_unparsed_name(krb5_context context, char *val)
554 {
555 SAFE_FREE(val);
556 }
557 #endif
558
559 void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
560 {
561 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
562 if (pdata->data) {
563 krb5_free_data_contents(context, pdata);
564 }
565 #else
566 SAFE_FREE(pdata->data);
567 #endif
568 }
569
570 void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype)
571 {
572 #if defined(HAVE_KRB5_KEYBLOCK_IN_CREDS)
573 KRB5_KEY_TYPE((&pcreds->keyblock)) = enctype;
574 #elif defined(HAVE_KRB5_SESSION_IN_CREDS)
575 KRB5_KEY_TYPE((&pcreds->session)) = enctype;
576 #else
577 #error UNKNOWN_KEYBLOCK_MEMBER_IN_KRB5_CREDS_STRUCT
578 #endif
579 }
580
581 bool kerberos_compatible_enctypes(krb5_context context,
582 krb5_enctype enctype1,
583 krb5_enctype enctype2)
584 {
585 #if defined(HAVE_KRB5_C_ENCTYPE_COMPARE)
586 krb5_boolean similar = 0;
587
588 krb5_c_enctype_compare(context, enctype1, enctype2, &similar);
589 return similar ? True : False;
590 #elif defined(HAVE_KRB5_ENCTYPES_COMPATIBLE_KEYS)
591 return krb5_enctypes_compatible_keys(context, enctype1, enctype2) ? True : False;
592 #endif
593 }
594
595 static bool ads_cleanup_expired_creds(krb5_context context,
596 krb5_ccache ccache,
597 krb5_creds *credsp)
598 {
599 krb5_error_code retval;
600 const char *cc_type = krb5_cc_get_type(context, ccache);
601
602 DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
603 cc_type, krb5_cc_get_name(context, ccache),
604 http_timestring(credsp->times.endtime)));
605
606 /* we will probably need new tickets if the current ones
607 will expire within 10 seconds.
608 */
609 if (credsp->times.endtime >= (time(NULL) + 10))
610 return False;
611
612 /* heimdal won't remove creds from a file ccache, and
613 perhaps we shouldn't anyway, since internally we
614 use memory ccaches, and a FILE one probably means that
615 we're using creds obtained outside of our exectuable
616 */
617 if (strequal(cc_type, "FILE")) {
618 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
619 return False;
620 }
621
622 retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
623 if (retval) {
624 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
625 error_message(retval)));
626 /* If we have an error in this, we want to display it,
627 but continue as though we deleted it */
628 }
629 return True;
630 }
631
632 /*
633 we can't use krb5_mk_req because w2k wants the service to be in a particular format
634 */
635 static krb5_error_code ads_krb5_mk_req(krb5_context context,
636 krb5_auth_context *auth_context,
637 const krb5_flags ap_req_options,
638 const char *principal,
639 krb5_ccache ccache,
640 krb5_data *outbuf,
641 time_t *expire_time)
642 {
643 krb5_error_code retval;
644 krb5_principal server;
645 krb5_creds * credsp;
646 krb5_creds creds;
647 krb5_data in_data;
648 bool creds_ready = False;
649 int i = 0, maxtries = 3;
650
651 ZERO_STRUCT(in_data);
652
653 retval = smb_krb5_parse_name(context, principal, &server);
654 if (retval) {
655 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
656 return retval;
657 }
658
659 /* obtain ticket & session key */
660 ZERO_STRUCT(creds);
661 if ((retval = krb5_copy_principal(context, server, &creds.server))) {
662 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
663 error_message(retval)));
664 goto cleanup_princ;
665 }
666
667 if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
668 /* This can commonly fail on smbd startup with no ticket in the cache.
669 * Report at higher level than 1. */
670 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
671 error_message(retval)));
672 goto cleanup_creds;
673 }
674
675 while (!creds_ready && (i < maxtries)) {
676
677 if ((retval = krb5_get_credentials(context, 0, ccache,
678 &creds, &credsp))) {
679 DEBUG(1,("ads_krb5_mk_req: krb5_get_credentials failed for %s (%s)\n",
680 principal, error_message(retval)));
681 goto cleanup_creds;
682 }
683
684 /* cope with ticket being in the future due to clock skew */
685 if ((unsigned)credsp->times.starttime > time(NULL)) {
686 time_t t = time(NULL);
687 int time_offset =(int)((unsigned)credsp->times.starttime-t);
688 DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
689 krb5_set_real_time(context, t + time_offset + 1, 0);
690 }
691
692 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
693 creds_ready = True;
694 }
695
696 i++;
697 }
698
699 DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
700 principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
701 http_timestring((unsigned)credsp->times.endtime),
702 (unsigned)credsp->times.endtime));
703
704 if (expire_time) {
705 *expire_time = (time_t)credsp->times.endtime;
706 }
707
708 #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)
709 if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
710 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
711 as part of the kerberos exchange. */
712
713 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n") );
714
715 if( *auth_context == NULL ) {
716 /* Allocate if it has not yet been allocated. */
717 retval = krb5_auth_con_init( context, auth_context );
718 if (retval) {
719 DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_init failed (%s)\n",
720 error_message(retval)));
721 goto cleanup_creds;
722 }
723 }
724
725 retval = krb5_auth_con_setuseruserkey( context, *auth_context, &credsp->keyblock );
726 if (retval) {
727 DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_setuseruserkey failed (%s)\n",
728 error_message(retval)));
729 goto cleanup_creds;
730 }
731
732 /* Must use a subkey for forwarded tickets. */
733 retval = krb5_auth_con_setflags( context, *auth_context, KRB5_AUTH_CONTEXT_USE_SUBKEY);
734 if (retval) {
735 DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_setflags failed (%s)\n",
736 error_message(retval)));
737 goto cleanup_creds;
738 }
739
740 retval = ads_krb5_get_fwd_ticket( context,
741 auth_context,
742 credsp,
743 ccache,
744 &in_data );
745 if (retval) {
746 DEBUG( 3, ("ads_krb5_get_fwd_ticket failed (%s)\n", error_message( retval ) ) );
747
748 /*
749 * This is not fatal. Delete the *auth_context and continue
750 * with krb5_mk_req_extended to get a non-forwardable ticket.
751 */
752
753 if (in_data.data) {
754 free( in_data.data );
755 in_data.data = NULL;
756 in_data.length = 0;
757 }
758 krb5_auth_con_free(context, *auth_context);
759 *auth_context = NULL;
760 }
761 }
762 #endif
763
764 retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
765 &in_data, credsp, outbuf);
766 if (retval) {
767 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
768 error_message(retval)));
769 }
770
771 if (in_data.data) {
772 free( in_data.data );
773 in_data.length = 0;
774 }
775
776 krb5_free_creds(context, credsp);
777
778 cleanup_creds:
779 krb5_free_cred_contents(context, &creds);
780
781 cleanup_princ:
782 krb5_free_principal(context, server);
783
784 return retval;
785 }
786
787 /*
788 get a kerberos5 ticket for the given service
789 */
790 int cli_krb5_get_ticket(const char *principal, time_t time_offset,
791 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
792 uint32 extra_ap_opts, const char *ccname,
793 time_t *tgs_expire)
794
795 {
796 krb5_error_code retval;
797 krb5_data packet;
798 krb5_context context = NULL;
799 krb5_ccache ccdef = NULL;
800 krb5_auth_context auth_context = NULL;
801 krb5_enctype enc_types[] = {
802 #ifdef ENCTYPE_ARCFOUR_HMAC
803 ENCTYPE_ARCFOUR_HMAC,
804 #endif
805 ENCTYPE_DES_CBC_MD5,
806 ENCTYPE_DES_CBC_CRC,
807 ENCTYPE_NULL};
808
809 initialize_krb5_error_table();
810 retval = krb5_init_context(&context);
811 if (retval) {
812 DEBUG(1,("cli_krb5_get_ticket: krb5_init_context failed (%s)\n",
813 error_message(retval)));
814 goto failed;
815 }
816
817 if (time_offset != 0) {
818 krb5_set_real_time(context, time(NULL) + time_offset, 0);
819 }
820
821 if ((retval = krb5_cc_resolve(context, ccname ?
822 ccname : krb5_cc_default_name(context), &ccdef))) {
823 DEBUG(1,("cli_krb5_get_ticket: krb5_cc_default failed (%s)\n",
824 error_message(retval)));
825 goto failed;
826 }
827
828 if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
829 DEBUG(1,("cli_krb5_get_ticket: krb5_set_default_tgs_ktypes failed (%s)\n",
830 error_message(retval)));
831 goto failed;
832 }
833
834 if ((retval = ads_krb5_mk_req(context,
835 &auth_context,
836 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
837 principal,
838 ccdef, &packet,
839 tgs_expire))) {
840 goto failed;
841 }
842
843 get_krb5_smb_session_key(context, auth_context, session_key_krb5, False);
844
845 *ticket = data_blob(packet.data, packet.length);
846
847 kerberos_free_data_contents(context, &packet);
848
849 failed:
850
851 if ( context ) {
852 if (ccdef)
853 krb5_cc_close(context, ccdef);
854 if (auth_context)
855 krb5_auth_con_free(context, auth_context);
856 krb5_free_context(context);
857 }
858
859 return retval;
860 }
861
862 bool get_krb5_smb_session_key(krb5_context context, krb5_auth_context auth_context, DATA_BLOB *session_key, bool remote)
863 {
864 krb5_keyblock *skey = NULL;
865 krb5_error_code err = 0;
866 bool ret = false;
867
868 if (remote) {
869 err = krb5_auth_con_getremotesubkey(context, auth_context, &skey);
870 } else {
871 err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey);
872 }
873
874 if (err || skey == NULL) {
875 DEBUG(10, ("KRB5 error getting session key %d\n", err));
876 goto done;
877 }
878
879 DEBUG(10, ("Got KRB5 session key of length %d\n", (int)KRB5_KEY_LENGTH(skey)));
880 *session_key = data_blob(KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
881 dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
882
883 ret = true;
884
885 done:
886 if (skey) {
887 krb5_free_keyblock(context, skey);
888 }
889
890 return ret;
891 }
892
893
894 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
895 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
896
897 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
898 {
899 static krb5_data kdata;
900
901 kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
902 kdata.length = strlen((const char *)kdata.data);
903 return &kdata;
904 }
905 #endif
906
907 krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
908 {
909 #if defined(HAVE_KRB5_KT_FREE_ENTRY)
910 return krb5_kt_free_entry(context, kt_entry);
911 #elif defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
912 return krb5_free_keytab_entry_contents(context, kt_entry);
913 #else
914 #error UNKNOWN_KT_FREE_FUNCTION
915 #endif
916 }
917
918 void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
919 struct PAC_SIGNATURE_DATA *sig)
920 {
921 #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
922 cksum->cksumtype = (krb5_cksumtype)sig->type;
923 cksum->checksum.length = sig->signature.length;
924 cksum->checksum.data = sig->signature.data;
925 #else
926 cksum->checksum_type = (krb5_cksumtype)sig->type;
927 cksum->length = sig->signature.length;
928 cksum->contents = sig->signature.data;
929 #endif
930 }
931
932 krb5_error_code smb_krb5_verify_checksum(krb5_context context,
933 const krb5_keyblock *keyblock,
934 krb5_keyusage usage,
935 krb5_checksum *cksum,
936 uint8 *data,
937 size_t length)
938 {
939 krb5_error_code ret;
940
941 /* verify the checksum */
942
943 /* welcome to the wonderful world of samba's kerberos abstraction layer:
944 *
945 * function heimdal 0.6.1rc3 heimdal 0.7 MIT krb 1.4.2
946 * -----------------------------------------------------------------------------
947 * krb5_c_verify_checksum - works works
948 * krb5_verify_checksum works (6 args) works (6 args) broken (7 args)
949 */
950
951 #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
952 {
953 krb5_boolean checksum_valid = False;
954 krb5_data input;
955
956 input.data = (char *)data;
957 input.length = length;
958
959 ret = krb5_c_verify_checksum(context,
960 keyblock,
961 usage,
962 &input,
963 cksum,
964 &checksum_valid);
965 if (ret) {
966 DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
967 error_message(ret)));
968 return ret;
969 }
970
971 if (!checksum_valid)
972 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
973 }
974
975 #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
976
977 /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
978 * without enctype and it ignores any key_usage types - Guenther */
979
980 {
981
982 krb5_crypto crypto;
983 ret = krb5_crypto_init(context,
984 keyblock,
985 0,
986 &crypto);
987 if (ret) {
988 DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
989 error_message(ret)));
990 return ret;
991 }
992
993 ret = krb5_verify_checksum(context,
994 crypto,
995 usage,
996 data,
997 length,
998 cksum);
999
1000 krb5_crypto_destroy(context, crypto);
1001 }
1002
1003 #else
1004 #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
1005 #endif
1006
1007 return ret;
1008 }
1009
1010 time_t get_authtime_from_tkt(krb5_ticket *tkt)
1011 {
1012 #if defined(HAVE_KRB5_TKT_ENC_PART2)
1013 return tkt->enc_part2->times.authtime;
1014 #else
1015 return tkt->ticket.authtime;
1016 #endif
1017 }
1018
1019 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1020 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
1021 {
1022 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
1023 if (ap_req->ticket->enc_part.kvno)
1024 return ap_req->ticket->enc_part.kvno;
1025 #else /* Heimdal */
1026 if (ap_req->ticket.enc_part.kvno)
1027 return *ap_req->ticket.enc_part.kvno;
1028 #endif
1029 return 0;
1030 }
1031
1032 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
1033 {
1034 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
1035 return ap_req->ticket.enc_part.etype;
1036 #else /* MIT */
1037 return ap_req->ticket->enc_part.enctype;
1038 #endif
1039 }
1040 #endif /* HAVE_KRB5_DECODE_AP_REQ */
1041
1042 static krb5_error_code
1043 get_key_from_keytab(krb5_context context,
1044 krb5_const_principal server,
1045 krb5_enctype enctype,
1046 krb5_kvno kvno,
1047 krb5_keyblock **out_key)
1048 {
1049 krb5_keytab_entry entry;
1050 krb5_error_code ret;
1051 krb5_keytab keytab;
1052 char *name = NULL;
1053
1054 /* We have to open a new keytab handle here, as MIT does
1055 an implicit open/getnext/close on krb5_kt_get_entry. We
1056 may be in the middle of a keytab enumeration when this is
1057 called. JRA. */
1058
1059 ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1060 if (ret) {
1061 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1062 return ret;
1063 }
1064
1065 if ( DEBUGLEVEL >= 10 ) {
1066 if (smb_krb5_unparse_name(context, server, &name) == 0) {
1067 DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1068 kvno, enctype, name));
1069 SAFE_FREE(name);
1070 }
1071 }
1072
1073 ret = krb5_kt_get_entry(context,
1074 keytab,
1075 server,
1076 kvno,
1077 enctype,
1078 &entry);
1079
1080 if (ret) {
1081 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1082 goto out;
1083 }
1084
1085 #ifdef HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK /* Heimdal */
1086 ret = krb5_copy_keyblock(context, &entry.keyblock, out_key);
1087 #elif defined(HAVE_KRB5_KEYTAB_ENTRY_KEY) /* MIT */
1088 ret = krb5_copy_keyblock(context, &entry.key, out_key);
1089 #else
1090 #error UNKNOWN_KRB5_KEYTAB_ENTRY_FORMAT
1091 #endif
1092
1093 if (ret) {
1094 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1095 goto out;
1096 }
1097
1098 smb_krb5_kt_free_entry(context, &entry);
1099
1100 out:
1101 krb5_kt_close(context, keytab);
1102 return ret;
1103 }
1104
1105 /* Prototypes */
1106
1107 krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1108 const krb5_data *inbuf,
1109 krb5_kvno *kvno,
1110 krb5_enctype *enctype)
1111 {
1112 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1113 {
1114 krb5_error_code ret;
1115 krb5_ap_req ap_req;
1116
1117 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1118 if (ret)
1119 return ret;
1120
1121 *kvno = get_kvno_from_ap_req(&ap_req);
1122 *enctype = get_enctype_from_ap_req(&ap_req);
1123
1124 free_AP_REQ(&ap_req);
1125 return 0;
1126 }
1127 #endif
1128
1129 /* Possibly not an appropriate error code. */
1130 return KRB5KDC_ERR_BADOPTION;
1131 }
1132
1133 krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1134 krb5_auth_context *auth_context,
1135 const krb5_data *inbuf,
1136 krb5_const_principal server,
1137 krb5_keytab keytab,
1138 krb5_flags *ap_req_options,
1139 krb5_ticket **ticket,
1140 krb5_keyblock **keyblock)
1141 {
1142 krb5_error_code ret;
1143 krb5_kvno kvno;
1144 krb5_enctype enctype;
1145 krb5_keyblock *local_keyblock;
1146
1147 ret = krb5_rd_req(context,
1148 auth_context,
1149 inbuf,
1150 server,
1151 keytab,
1152 ap_req_options,
1153 ticket);
1154 if (ret) {
1155 return ret;
1156 }
1157
1158 #ifdef KRB5_TICKET_HAS_KEYINFO
1159 enctype = (*ticket)->enc_part.enctype;
1160 kvno = (*ticket)->enc_part.kvno;
1161 #else
1162 ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1163 if (ret) {
1164 return ret;
1165 }
1166 #endif
1167
1168 ret = get_key_from_keytab(context,
1169 server,
1170 enctype,
1171 kvno,
1172 &local_keyblock);
1173 if (ret) {
1174 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1175 goto out;
1176 }
1177
1178 out:
1179 if (ret && local_keyblock != NULL) {
1180 krb5_free_keyblock(context, local_keyblock);
1181 } else {
1182 *keyblock = local_keyblock;
1183 }
1184
1185 return ret;
1186 }
1187
1188 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1189 const char *name,
1190 krb5_principal *principal)
1191 {
1192 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1193 return smb_krb5_parse_name_norealm_conv(context, name, principal);
1194 #endif
1195
1196 /* we are cheating here because parse_name will in fact set the realm.
1197 * We don't care as the only caller of smb_krb5_parse_name_norealm
1198 * ignores the realm anyway when calling
1199 * smb_krb5_principal_compare_any_realm later - Guenther */
1200
1201 return smb_krb5_parse_name(context, name, principal);
1202 }
1203
1204 bool smb_krb5_principal_compare_any_realm(krb5_context context,
1205 krb5_const_principal princ1,
1206 krb5_const_principal princ2)
1207 {
1208 #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1209
1210 return krb5_principal_compare_any_realm(context, princ1, princ2);
1211
1212 /* krb5_princ_size is a macro in MIT */
1213 #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1214
1215 int i, len1, len2;
1216 const krb5_data *p1, *p2;
1217
1218 len1 = krb5_princ_size(context, princ1);
1219 len2 = krb5_princ_size(context, princ2);
1220
1221 if (len1 != len2)
1222 return False;
1223
1224 for (i = 0; i < len1; i++) {
1225
1226 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1227 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1228
1229 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1230 return False;
1231 }
1232
1233 return True;
1234 #else
1235 #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1236 #endif
1237 }
1238
1239 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, /* FILE:/tmp/krb5cc_0 */
1240 const char *client_string, /* gd@BER.SUSE.DE */
1241 const char *service_string, /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1242 time_t *expire_time)
1243 {
1244 krb5_error_code ret;
1245 krb5_context context = NULL;
1246 krb5_ccache ccache = NULL;
1247 krb5_principal client = NULL;
1248 krb5_creds creds, creds_in, *creds_out = NULL;
1249
1250 ZERO_STRUCT(creds);
1251 ZERO_STRUCT(creds_in);
1252
1253 initialize_krb5_error_table();
1254 ret = krb5_init_context(&context);
1255 if (ret) {
1256 goto done;
1257 }
1258
1259 if (!ccache_string) {
1260 ccache_string = krb5_cc_default_name(context);
1261 }
1262
1263 if (!ccache_string) {
1264 ret = EINVAL;
1265 goto done;
1266 }
1267
1268 DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1269
1270 /* FIXME: we should not fall back to defaults */
1271 ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1272 if (ret) {
1273 goto done;
1274 }
1275
1276 if (client_string) {
1277 ret = smb_krb5_parse_name(context, client_string, &client);
1278 if (ret) {
1279 goto done;
1280 }
1281 } else {
1282 ret = krb5_cc_get_principal(context, ccache, &client);
1283 if (ret) {
1284 goto done;
1285 }
1286 }
1287
1288 #ifdef HAVE_KRB5_GET_RENEWED_CREDS /* MIT */
1289 {
1290 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1291 if (ret) {
1292 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1293 goto done;
1294 }
1295 }
1296 #elif defined(HAVE_KRB5_GET_KDC_CRED) /* Heimdal */
1297 {
1298 krb5_kdc_flags flags;
1299 krb5_realm *client_realm = NULL;
1300
1301 ret = krb5_copy_principal(context, client, &creds_in.client);
1302 if (ret) {
1303 goto done;
1304 }
1305
1306 if (service_string) {
1307 ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1308 if (ret) {
1309 goto done;
1310 }
1311 } else {
1312 /* build tgt service by default */
1313 client_realm = krb5_princ_realm(context, creds_in.client);
1314 if (!client_realm) {
1315 ret = ENOMEM;
1316 goto done;
1317 }
1318 ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1319 if (ret) {
1320 goto done;
1321 }
1322 }
1323
1324 flags.i = 0;
1325 flags.b.renewable = flags.b.renew = True;
1326
1327 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1328 if (ret) {
1329 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1330 goto done;
1331 }
1332
1333 creds = *creds_out;
1334 }
1335 #else
1336 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1337 #endif
1338
1339 /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1340 ret = krb5_cc_initialize(context, ccache, client);
1341 if (ret) {
1342 goto done;
1343 }
1344
1345 ret = krb5_cc_store_cred(context, ccache, &creds);
1346
1347 if (expire_time) {
1348 *expire_time = (time_t) creds.times.endtime;
1349 }
1350
1351 done:
1352 krb5_free_cred_contents(context, &creds_in);
1353
1354 if (creds_out) {
1355 krb5_free_creds(context, creds_out);
1356 } else {
1357 krb5_free_cred_contents(context, &creds);
1358 }
1359
1360 if (client) {
1361 krb5_free_principal(context, client);
1362 }
1363 if (ccache) {
1364 krb5_cc_close(context, ccache);
1365 }
1366 if (context) {
1367 krb5_free_context(context);
1368 }
1369
1370 return ret;
1371 }
1372
1373 krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1374 {
1375 krb5_error_code ret = 0;
1376 if (addr == NULL) {
1377 return ret;
1378 }
1379 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1380 krb5_free_addresses(context, addr->addrs);
1381 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1382 ret = krb5_free_addresses(context, addr->addrs);
1383 SAFE_FREE(addr->addrs);
1384 #endif
1385 SAFE_FREE(addr);
1386 addr = NULL;
1387 return ret;
1388 }
1389
1390 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1391 {
1392 krb5_error_code ret = 0;
1393 nstring buf;
1394 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1395 krb5_address **addrs = NULL;
1396 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1397 krb5_addresses *addrs = NULL;
1398 #endif
1399
1400 *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1401 if (*kerb_addr == NULL) {
1402 return ENOMEM;
1403 }
1404
1405 put_name(buf, global_myname(), ' ', 0x20);
1406
1407 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1408 {
1409 int num_addr = 2;
1410
1411 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1412 if (addrs == NULL) {
1413 SAFE_FREE(kerb_addr);
1414 return ENOMEM;
1415 }
1416
1417 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1418
1419 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1420 if (addrs[0] == NULL) {
1421 SAFE_FREE(addrs);
1422 SAFE_FREE(kerb_addr);
1423 return ENOMEM;
1424 }
1425
1426 addrs[0]->magic = KV5M_ADDRESS;
1427 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1428 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1429 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1430 if (addrs[0]->contents == NULL) {
1431 SAFE_FREE(addrs[0]);
1432 SAFE_FREE(addrs);
1433 SAFE_FREE(kerb_addr);
1434 return ENOMEM;
1435 }
1436
1437 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1438
1439 addrs[1] = NULL;
1440 }
1441 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1442 {
1443 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1444 if (addrs == NULL) {
1445 SAFE_FREE(kerb_addr);
1446 return ENOMEM;
1447 }
1448
1449 memset(addrs, 0, sizeof(krb5_addresses));
1450
1451 addrs->len = 1;
1452 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1453 if (addrs->val == NULL) {
1454 SAFE_FREE(addrs);
1455 SAFE_FREE(kerb_addr);
1456 return ENOMEM;
1457 }
1458
1459 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1460 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1461 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1462 if (addrs->val[0].address.data == NULL) {
1463 SAFE_FREE(addrs->val);
1464 SAFE_FREE(addrs);
1465 SAFE_FREE(kerb_addr);
1466 return ENOMEM;
1467 }
1468
1469 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1470 }
1471 #else
1472 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1473 #endif
1474 (*kerb_addr)->addrs = addrs;
1475
1476 return ret;
1477 }
1478
1479 void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1480 {
1481 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1482 krb5_free_error_contents(context, krberror);
1483 #else /* MIT */
1484 krb5_free_error(context, krberror);
1485 #endif
1486 }
1487
1488 krb5_error_code handle_krberror_packet(krb5_context context,
1489 krb5_data *packet)
1490 {
1491 krb5_error_code ret;
1492 bool got_error_code = False;
1493
1494 DEBUG(10,("handle_krberror_packet: got error packet\n"));
1495
1496 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1497 {
1498 krb5_error krberror;
1499
1500 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1501 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1502 error_message(ret)));
1503 return ret;
1504 }
1505
1506 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1507 ret = (krb5_error_code) krberror.error_code;
1508 got_error_code = True;
1509 }
1510
1511 smb_krb5_free_error(context, &krberror);
1512 }
1513 #else /* MIT */
1514 {
1515 krb5_error *krberror;
1516
1517 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1518 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1519 error_message(ret)));
1520 return ret;
1521 }
1522
1523 if (krberror->e_data.data == NULL) {
1524 ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1525 got_error_code = True;
1526 }
1527 smb_krb5_free_error(context, krberror);
1528 }
1529 #endif
1530 if (got_error_code) {
1531 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1532 error_message(ret), ret));
1533 }
1534 return ret;
1535 }
1536
1537 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1538 krb5_get_init_creds_opt **opt)
1539 {
1540 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1541 /* Heimdal or modern MIT version */
1542 return krb5_get_init_creds_opt_alloc(context, opt);
1543 #else
1544 /* Historical MIT version */
1545 krb5_get_init_creds_opt *my_opt;
1546
1547 *opt = NULL;
1548
1549 if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1550 return ENOMEM;
1551 }
1552
1553 krb5_get_init_creds_opt_init(my_opt);
1554
1555 *opt = my_opt;
1556 return 0;
1557 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC */
1558 }
1559
1560 void smb_krb5_get_init_creds_opt_free(krb5_context context,
1561 krb5_get_init_creds_opt *opt)
1562 {
1563 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1564
1565 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1566 /* Modern MIT or Heimdal version */
1567 krb5_get_init_creds_opt_free(context, opt);
1568 #else
1569 /* Heimdal version */
1570 krb5_get_init_creds_opt_free(opt);
1571 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1572
1573 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1574 /* Historical MIT version */
1575 SAFE_FREE(opt);
1576 opt = NULL;
1577 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1578 }
1579
1580 krb5_enctype smb_get_enctype_from_kt_entry(const krb5_keytab_entry *kt_entry)
1581 {
1582 #ifdef HAVE_KRB5_KEYTAB_ENTRY_KEY /* MIT */
1583 return kt_entry->key.enctype;
1584 #elif defined(HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK) /* Heimdal */
1585 return kt_entry->keyblock.keytype;
1586 #else
1587 #error UNKNOWN_KRB5_KEYTAB_ENTRY_KEYBLOCK_FORMAT
1588 #endif
1589 }
1590
1591
1592 /* caller needs to free etype_s */
1593 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1594 krb5_enctype enctype,
1595 char **etype_s)
1596 {
1597 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1598 return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1599 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1600 char buf[256];
1601 krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1602 if (ret) {
1603 return ret;
1604 }
1605 *etype_s = SMB_STRDUP(buf);
1606 if (!*etype_s) {
1607 return ENOMEM;
1608 }
1609 return ret;
1610 #else
1611 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1612 #endif
1613 }
1614
1615 krb5_error_code smb_krb5_mk_error(krb5_context context,
1616 krb5_error_code error_code,
1617 const krb5_principal server,
1618 krb5_data *reply)
1619 {
1620 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1621 /*
1622 * The MIT interface is *terrible*.
1623 * We have to construct this ourselves...
1624 */
1625 krb5_error e;
1626
1627 memset(&e, 0, sizeof(e));
1628 krb5_us_timeofday(context, &e.stime, &e.susec);
1629 e.server = server;
1630 #if defined(krb5_err_base)
1631 e.error = error_code - krb5_err_base;
1632 #elif defined(ERROR_TABLE_BASE_krb5)
1633 e.error = error_code - ERROR_TABLE_BASE_krb5;
1634 #else
1635 e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1636 #endif
1637
1638 return krb5_mk_error(context, &e, reply);
1639 #else /* Heimdal. */
1640 return krb5_mk_error(context,
1641 error_code,
1642 NULL,
1643 NULL, /* e_data */
1644 NULL,
1645 server,
1646 NULL,
1647 NULL,
1648 reply);
1649 #endif
1650 }
1651
1652 /**********************************************************************
1653 * Open a krb5 keytab with flags, handles readonly or readwrite access and
1654 * allows to process non-default keytab names.
1655 * @param context krb5_context
1656 * @param keytab_name_req string
1657 * @param write_access bool if writable keytab is required
1658 * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1659 * @return krb5_error_code
1660 **********************************************************************/
1661
1662 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1663 #ifndef MAX_KEYTAB_NAME_LEN
1664 #define MAX_KEYTAB_NAME_LEN 1100
1665 #endif
1666
1667 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1668 const char *keytab_name_req,
1669 bool write_access,
1670 krb5_keytab *keytab)
1671 {
1672 krb5_error_code ret = 0;
1673 TALLOC_CTX *mem_ctx;
1674 char keytab_string[MAX_KEYTAB_NAME_LEN];
1675 char *kt_str = NULL;
1676 bool found_valid_name = False;
1677 const char *pragma = "FILE";
1678 const char *tmp = NULL;
1679
1680 if (!write_access && !keytab_name_req) {
1681 /* caller just wants to read the default keytab readonly, so be it */
1682 return krb5_kt_default(context, keytab);
1683 }
1684
1685 mem_ctx = talloc_init("smb_krb5_open_keytab");
1686 if (!mem_ctx) {
1687 return ENOMEM;
1688 }
1689
1690 #ifdef HAVE_WRFILE_KEYTAB
1691 if (write_access) {
1692 pragma = "WRFILE";
1693 }
1694 #endif
1695
1696 if (keytab_name_req) {
1697
1698 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1699 ret = KRB5_CONFIG_NOTENUFSPACE;
1700 goto out;
1701 }
1702
1703 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1704 (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1705 tmp = keytab_name_req;
1706 goto resolve;
1707 }
1708
1709 if (keytab_name_req[0] != '/') {
1710 ret = KRB5_KT_BADNAME;
1711 goto out;
1712 }
1713
1714 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1715 if (!tmp) {
1716 ret = ENOMEM;
1717 goto out;
1718 }
1719
1720 goto resolve;
1721 }
1722
1723 /* we need to handle more complex keytab_strings, like:
1724 * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1725
1726 ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1727 if (ret) {
1728 goto out;
1729 }
1730
1731 DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1732
1733 tmp = talloc_strdup(mem_ctx, keytab_string);
1734 if (!tmp) {
1735 ret = ENOMEM;
1736 goto out;
1737 }
1738
1739 if (strncmp(tmp, "ANY:", 4) == 0) {
1740 tmp += 4;
1741 }
1742
1743 memset(&keytab_string, '\0', sizeof(keytab_string));
1744
1745 while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1746 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1747 found_valid_name = True;
1748 tmp = kt_str;
1749 tmp += 7;
1750 }
1751
1752 if (strncmp(kt_str, "FILE:", 5) == 0) {
1753 found_valid_name = True;
1754 tmp = kt_str;
1755 tmp += 5;
1756 }
1757
1758 if (tmp[0] == '/') {
1759 /* Treat as a FILE: keytab definition. */
1760 found_valid_name = true;
1761 }
1762
1763 if (found_valid_name) {
1764 if (tmp[0] != '/') {
1765 ret = KRB5_KT_BADNAME;
1766 goto out;
1767 }
1768
1769 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1770 if (!tmp) {
1771 ret = ENOMEM;
1772 goto out;
1773 }
1774 break;
1775 }
1776 }
1777
1778 if (!found_valid_name) {
1779 ret = KRB5_KT_UNKNOWN_TYPE;
1780 goto out;
1781 }
1782
1783 resolve:
1784 DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1785 ret = krb5_kt_resolve(context, tmp, keytab);
1786
1787 out:
1788 TALLOC_FREE(mem_ctx);
1789 return ret;
1790 }
1791
1792 #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)
1793 /**************************************************************
1794 Routine: ads_krb5_get_fwd_ticket
1795 Description:
1796 When a service ticket is flagged as trusted
1797 for delegation we should provide a forwardable
1798 ticket so that the remote host can act on our
1799 behalf. This is done by taking the 2nd forwardable
1800 TGT and storing it in the GSS-API authenticator
1801 "checksum". This routine will populate
1802 the krb5_data authenticator with this TGT.
1803 Parameters:
1804 krb5_context context: The kerberos context for this authentication.
1805 krb5_auth_context: The authentication context.
1806 krb5_creds *credsp: The ticket credentials (AS-REP).
1807 krb5_ccache ccache: The credentials cache.
1808 krb5_data &authenticator: The checksum field that will store the TGT, and
1809 authenticator.data must be freed by the caller.
1810
1811 Returns:
1812 krb5_error_code: 0 if no errors, otherwise set.
1813 **************************************************************/
1814
1815 static krb5_error_code ads_krb5_get_fwd_ticket( krb5_context context,
1816 krb5_auth_context *auth_context,
1817 krb5_creds *credsp,
1818 krb5_ccache ccache,
1819 krb5_data *authenticator)
1820 {
1821 krb5_data fwdData;
1822 krb5_error_code retval = 0;
1823 char *pChksum = NULL;
1824 char *p = NULL;
1825
1826 ZERO_STRUCT(fwdData);
1827 ZERO_STRUCTP(authenticator);
1828
1829 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
1830 *auth_context, /* Authentication context [in] */
1831 CONST_DISCARD(char *, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
1832 credsp->client, /* Client principal for the tgt [in] */
1833 credsp->server, /* Server principal for the tgt [in] */
1834 ccache, /* Credential cache to use for storage [in] */
1835 1, /* Turn on for "Forwardable ticket" [in] */
1836 &fwdData ); /* Resulting response [out] */
1837
1838
1839 if (retval) {
1840 DEBUG(1,("ads_krb5_get_fwd_ticket: krb5_fwd_tgt_creds failed (%s)\n",
1841 error_message(retval)));
1842 goto out;
1843 }
1844
1845 if ((unsigned int)GSSAPI_CHECKSUM_SIZE + (unsigned int)fwdData.length <
1846 (unsigned int)GSSAPI_CHECKSUM_SIZE) {
1847 retval = EINVAL;
1848 goto out;
1849 }
1850
1851 /* We're going to allocate a gssChecksum structure with a little
1852 extra data the length of the kerberos credentials length
1853 (APPLICATION 22) so that we can pack it on the end of the structure.
1854 */
1855
1856 pChksum = (char *)SMB_MALLOC(GSSAPI_CHECKSUM_SIZE + fwdData.length );
1857 if (!pChksum) {
1858 retval = ENOMEM;
1859 goto out;
1860 }
1861
1862 p = pChksum;
1863
1864 SIVAL(p, 0, GSSAPI_BNDLENGTH);
1865 p += 4;
1866
1867 /* Zero out the bindings fields */
1868 memset(p, '\0', GSSAPI_BNDLENGTH );
1869 p += GSSAPI_BNDLENGTH;
1870
1871 SIVAL(p, 0, GSS_C_DELEG_FLAG );
1872 p += 4;
1873 SSVAL(p, 0, 1 );
1874 p += 2;
1875 SSVAL(p, 0, fwdData.length );
1876 p += 2;
1877
1878 /* Migrate the kerberos KRB_CRED data to the checksum delegation */
1879 memcpy(p, fwdData.data, fwdData.length );
1880 p += fwdData.length;
1881
1882 /* We need to do this in order to allow our GSS-API */
1883 retval = krb5_auth_con_set_req_cksumtype( context, *auth_context, GSSAPI_CHECKSUM );
1884 if (retval) {
1885 goto out;
1886 }
1887
1888 /* We now have a service ticket, now turn it into an AP-REQ. */
1889 authenticator->length = fwdData.length + GSSAPI_CHECKSUM_SIZE;
1890
1891 /* Caller should call free() when they're done with this. */
1892 authenticator->data = (char *)pChksum;
1893
1894 out:
1895
1896 /* Remove that input data, we never needed it anyway. */
1897 if (fwdData.length > 0) {
1898 krb5_free_data_contents( context, &fwdData );
1899 }
1900
1901 return retval;
1902 }
1903 #endif
1904
1905 #else /* HAVE_KRB5 */
1906 /* this saves a few linking headaches */
1907 int cli_krb5_get_ticket(const char *principal, time_t time_offset,
1908 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, uint32 extra_ap_opts,
1909 const char *ccname, time_t *tgs_expire)
1910 {
1911 DEBUG(0,("NO KERBEROS SUPPORT\n"));
1912 return 1;
1913 }
1914
1915 #endif
Samba GIT mirror