source: branches/samba-3.2.x/source/libsmb/clikrb5.c@ 198

Last change on this file since 198 was 149, checked in by Paul Smedley, 17 years ago

Update trunk to v3.2.2
File size: 51.8 KB
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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)
45static 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
82static 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
312bool 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
351bool 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
595static 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*/
635static 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( 1, ("ads_krb5_get_fwd_ticket failed (%s)\n", error_message( retval ) ) );
747 goto cleanup_creds;
748 }
749
750 if (retval) {
751 DEBUG( 1, ("krb5_auth_con_set_req_cksumtype failed (%s)\n",
752 error_message( retval ) ) );
753 goto cleanup_creds;
754 }
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
773cleanup_creds:
774 krb5_free_cred_contents(context, &creds);
775
776cleanup_princ:
777 krb5_free_principal(context, server);
778
779 return retval;
780}
781
782/*
783 get a kerberos5 ticket for the given service
784*/
785int 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
844failed:
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 */
1009static 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
1021static 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
1031static krb5_error_code
1032get_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
1043 /* We have to open a new keytab handle here, as MIT does
1044 an implicit open/getnext/close on krb5_kt_get_entry. We
1045 may be in the middle of a keytab enumeration when this is
1046 called. JRA. */
1047
1048 ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1049 if (ret) {
1050 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1051 return ret;
1052 }
1053
1054 if ( DEBUGLEVEL >= 10 ) {
1055 if (smb_krb5_unparse_name(context, server, &name) == 0) {
1056 DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1057 kvno, enctype, name));
1058 SAFE_FREE(name);
1059 }
1060 }
1061
1062 ret = krb5_kt_get_entry(context,
1063 keytab,
1064 server,
1065 kvno,
1066 enctype,
1067 &entry);
1068
1069 if (ret) {
1070 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1071 goto out;
1072 }
1073
1074#ifdef HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK /* Heimdal */
1075 ret = krb5_copy_keyblock(context, &entry.keyblock, out_key);
1076#elif defined(HAVE_KRB5_KEYTAB_ENTRY_KEY) /* MIT */
1077 ret = krb5_copy_keyblock(context, &entry.key, out_key);
1078#else
1079#error UNKNOWN_KRB5_KEYTAB_ENTRY_FORMAT
1080#endif
1081
1082 if (ret) {
1083 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1084 goto out;
1085 }
1086
1087 smb_krb5_kt_free_entry(context, &entry);
1088
1089out:
1090 krb5_kt_close(context, keytab);
1091 return ret;
1092}
1093
1094/* Prototypes */
1095
1096 krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1097 const krb5_data *inbuf,
1098 krb5_kvno *kvno,
1099 krb5_enctype *enctype)
1100{
1101#ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1102 {
1103 krb5_error_code ret;
1104 krb5_ap_req ap_req;
1105
1106 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1107 if (ret)
1108 return ret;
1109
1110 *kvno = get_kvno_from_ap_req(&ap_req);
1111 *enctype = get_enctype_from_ap_req(&ap_req);
1112
1113 free_AP_REQ(&ap_req);
1114 return 0;
1115 }
1116#endif
1117
1118 /* Possibly not an appropriate error code. */
1119 return KRB5KDC_ERR_BADOPTION;
1120}
1121
1122 krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1123 krb5_auth_context *auth_context,
1124 const krb5_data *inbuf,
1125 krb5_const_principal server,
1126 krb5_keytab keytab,
1127 krb5_flags *ap_req_options,
1128 krb5_ticket **ticket,
1129 krb5_keyblock **keyblock)
1130{
1131 krb5_error_code ret;
1132 krb5_kvno kvno;
1133 krb5_enctype enctype;
1134 krb5_keyblock *local_keyblock;
1135
1136 ret = krb5_rd_req(context,
1137 auth_context,
1138 inbuf,
1139 server,
1140 keytab,
1141 ap_req_options,
1142 ticket);
1143 if (ret) {
1144 return ret;
1145 }
1146
1147#ifdef KRB5_TICKET_HAS_KEYINFO
1148 enctype = (*ticket)->enc_part.enctype;
1149 kvno = (*ticket)->enc_part.kvno;
1150#else
1151 ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1152 if (ret) {
1153 return ret;
1154 }
1155#endif
1156
1157 ret = get_key_from_keytab(context,
1158 server,
1159 enctype,
1160 kvno,
1161 &local_keyblock);
1162 if (ret) {
1163 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1164 goto out;
1165 }
1166
1167out:
1168 if (ret && local_keyblock != NULL) {
1169 krb5_free_keyblock(context, local_keyblock);
1170 } else {
1171 *keyblock = local_keyblock;
1172 }
1173
1174 return ret;
1175}
1176
1177 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1178 const char *name,
1179 krb5_principal *principal)
1180{
1181#ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1182 return smb_krb5_parse_name_norealm_conv(context, name, principal);
1183#endif
1184
1185 /* we are cheating here because parse_name will in fact set the realm.
1186 * We don't care as the only caller of smb_krb5_parse_name_norealm
1187 * ignores the realm anyway when calling
1188 * smb_krb5_principal_compare_any_realm later - Guenther */
1189
1190 return smb_krb5_parse_name(context, name, principal);
1191}
1192
1193 bool smb_krb5_principal_compare_any_realm(krb5_context context,
1194 krb5_const_principal princ1,
1195 krb5_const_principal princ2)
1196{
1197#ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1198
1199 return krb5_principal_compare_any_realm(context, princ1, princ2);
1200
1201/* krb5_princ_size is a macro in MIT */
1202#elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1203
1204 int i, len1, len2;
1205 const krb5_data *p1, *p2;
1206
1207 len1 = krb5_princ_size(context, princ1);
1208 len2 = krb5_princ_size(context, princ2);
1209
1210 if (len1 != len2)
1211 return False;
1212
1213 for (i = 0; i < len1; i++) {
1214
1215 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1216 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1217
1218 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1219 return False;
1220 }
1221
1222 return True;
1223#else
1224#error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1225#endif
1226}
1227
1228 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, /* FILE:/tmp/krb5cc_0 */
1229 const char *client_string, /* gd@BER.SUSE.DE */
1230 const char *service_string, /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1231 time_t *expire_time)
1232{
1233 krb5_error_code ret;
1234 krb5_context context = NULL;
1235 krb5_ccache ccache = NULL;
1236 krb5_principal client = NULL;
1237 krb5_creds creds, creds_in, *creds_out = NULL;
1238
1239 ZERO_STRUCT(creds);
1240 ZERO_STRUCT(creds_in);
1241
1242 initialize_krb5_error_table();
1243 ret = krb5_init_context(&context);
1244 if (ret) {
1245 goto done;
1246 }
1247
1248 if (!ccache_string) {
1249 ccache_string = krb5_cc_default_name(context);
1250 }
1251
1252 if (!ccache_string) {
1253 ret = EINVAL;
1254 goto done;
1255 }
1256
1257 DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1258
1259 /* FIXME: we should not fall back to defaults */
1260 ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1261 if (ret) {
1262 goto done;
1263 }
1264
1265 if (client_string) {
1266 ret = smb_krb5_parse_name(context, client_string, &client);
1267 if (ret) {
1268 goto done;
1269 }
1270 } else {
1271 ret = krb5_cc_get_principal(context, ccache, &client);
1272 if (ret) {
1273 goto done;
1274 }
1275 }
1276
1277#ifdef HAVE_KRB5_GET_RENEWED_CREDS /* MIT */
1278 {
1279 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1280 if (ret) {
1281 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1282 goto done;
1283 }
1284 }
1285#elif defined(HAVE_KRB5_GET_KDC_CRED) /* Heimdal */
1286 {
1287 krb5_kdc_flags flags;
1288 krb5_realm *client_realm = NULL;
1289
1290 ret = krb5_copy_principal(context, client, &creds_in.client);
1291 if (ret) {
1292 goto done;
1293 }
1294
1295 if (service_string) {
1296 ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1297 if (ret) {
1298 goto done;
1299 }
1300 } else {
1301 /* build tgt service by default */
1302 client_realm = krb5_princ_realm(context, creds_in.client);
1303 if (!client_realm) {
1304 ret = ENOMEM;
1305 goto done;
1306 }
1307 ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1308 if (ret) {
1309 goto done;
1310 }
1311 }
1312
1313 flags.i = 0;
1314 flags.b.renewable = flags.b.renew = True;
1315
1316 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1317 if (ret) {
1318 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1319 goto done;
1320 }
1321
1322 creds = *creds_out;
1323 }
1324#else
1325#error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1326#endif
1327
1328 /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1329 ret = krb5_cc_initialize(context, ccache, client);
1330 if (ret) {
1331 goto done;
1332 }
1333
1334 ret = krb5_cc_store_cred(context, ccache, &creds);
1335
1336 if (expire_time) {
1337 *expire_time = (time_t) creds.times.endtime;
1338 }
1339
1340done:
1341 krb5_free_cred_contents(context, &creds_in);
1342
1343 if (creds_out) {
1344 krb5_free_creds(context, creds_out);
1345 } else {
1346 krb5_free_cred_contents(context, &creds);
1347 }
1348
1349 if (client) {
1350 krb5_free_principal(context, client);
1351 }
1352 if (ccache) {
1353 krb5_cc_close(context, ccache);
1354 }
1355 if (context) {
1356 krb5_free_context(context);
1357 }
1358
1359 return ret;
1360}
1361
1362 krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1363{
1364 krb5_error_code ret = 0;
1365 if (addr == NULL) {
1366 return ret;
1367 }
1368#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1369 krb5_free_addresses(context, addr->addrs);
1370#elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1371 ret = krb5_free_addresses(context, addr->addrs);
1372 SAFE_FREE(addr->addrs);
1373#endif
1374 SAFE_FREE(addr);
1375 addr = NULL;
1376 return ret;
1377}
1378
1379 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1380{
1381 krb5_error_code ret = 0;
1382 nstring buf;
1383#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1384 krb5_address **addrs = NULL;
1385#elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1386 krb5_addresses *addrs = NULL;
1387#endif
1388
1389 *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1390 if (*kerb_addr == NULL) {
1391 return ENOMEM;
1392 }
1393
1394 put_name(buf, global_myname(), ' ', 0x20);
1395
1396#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1397 {
1398 int num_addr = 2;
1399
1400 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1401 if (addrs == NULL) {
1402 SAFE_FREE(kerb_addr);
1403 return ENOMEM;
1404 }
1405
1406 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1407
1408 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1409 if (addrs[0] == NULL) {
1410 SAFE_FREE(addrs);
1411 SAFE_FREE(kerb_addr);
1412 return ENOMEM;
1413 }
1414
1415 addrs[0]->magic = KV5M_ADDRESS;
1416 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1417 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1418 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1419 if (addrs[0]->contents == NULL) {
1420 SAFE_FREE(addrs[0]);
1421 SAFE_FREE(addrs);
1422 SAFE_FREE(kerb_addr);
1423 return ENOMEM;
1424 }
1425
1426 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1427
1428 addrs[1] = NULL;
1429 }
1430#elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1431 {
1432 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1433 if (addrs == NULL) {
1434 SAFE_FREE(kerb_addr);
1435 return ENOMEM;
1436 }
1437
1438 memset(addrs, 0, sizeof(krb5_addresses));
1439
1440 addrs->len = 1;
1441 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1442 if (addrs->val == NULL) {
1443 SAFE_FREE(addrs);
1444 SAFE_FREE(kerb_addr);
1445 return ENOMEM;
1446 }
1447
1448 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1449 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1450 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1451 if (addrs->val[0].address.data == NULL) {
1452 SAFE_FREE(addrs->val);
1453 SAFE_FREE(addrs);
1454 SAFE_FREE(kerb_addr);
1455 return ENOMEM;
1456 }
1457
1458 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1459 }
1460#else
1461#error UNKNOWN_KRB5_ADDRESS_FORMAT
1462#endif
1463 (*kerb_addr)->addrs = addrs;
1464
1465 return ret;
1466}
1467
1468 void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1469{
1470#ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1471 krb5_free_error_contents(context, krberror);
1472#else /* MIT */
1473 krb5_free_error(context, krberror);
1474#endif
1475}
1476
1477 krb5_error_code handle_krberror_packet(krb5_context context,
1478 krb5_data *packet)
1479{
1480 krb5_error_code ret;
1481 bool got_error_code = False;
1482
1483 DEBUG(10,("handle_krberror_packet: got error packet\n"));
1484
1485#ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1486 {
1487 krb5_error krberror;
1488
1489 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1490 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1491 error_message(ret)));
1492 return ret;
1493 }
1494
1495 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1496 ret = (krb5_error_code) krberror.error_code;
1497 got_error_code = True;
1498 }
1499
1500 smb_krb5_free_error(context, &krberror);
1501 }
1502#else /* MIT */
1503 {
1504 krb5_error *krberror;
1505
1506 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1507 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1508 error_message(ret)));
1509 return ret;
1510 }
1511
1512 if (krberror->e_data.data == NULL) {
1513 ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1514 got_error_code = True;
1515 }
1516 smb_krb5_free_error(context, krberror);
1517 }
1518#endif
1519 if (got_error_code) {
1520 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1521 error_message(ret), ret));
1522 }
1523 return ret;
1524}
1525
1526 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1527 krb5_get_init_creds_opt **opt)
1528{
1529#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1530 /* Heimdal or modern MIT version */
1531 return krb5_get_init_creds_opt_alloc(context, opt);
1532#else
1533 /* Historical MIT version */
1534 krb5_get_init_creds_opt *my_opt;
1535
1536 *opt = NULL;
1537
1538 if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1539 return ENOMEM;
1540 }
1541
1542 krb5_get_init_creds_opt_init(my_opt);
1543
1544 *opt = my_opt;
1545 return 0;
1546#endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC */
1547}
1548
1549 void smb_krb5_get_init_creds_opt_free(krb5_context context,
1550 krb5_get_init_creds_opt *opt)
1551{
1552#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1553
1554#ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1555 /* Modern MIT or Heimdal version */
1556 krb5_get_init_creds_opt_free(context, opt);
1557#else
1558 /* Heimdal version */
1559 krb5_get_init_creds_opt_free(opt);
1560#endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1561
1562#else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1563 /* Historical MIT version */
1564 SAFE_FREE(opt);
1565 opt = NULL;
1566#endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1567}
1568
1569 krb5_enctype smb_get_enctype_from_kt_entry(const krb5_keytab_entry *kt_entry)
1570{
1571#ifdef HAVE_KRB5_KEYTAB_ENTRY_KEY /* MIT */
1572 return kt_entry->key.enctype;
1573#elif defined(HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK) /* Heimdal */
1574 return kt_entry->keyblock.keytype;
1575#else
1576#error UNKNOWN_KRB5_KEYTAB_ENTRY_KEYBLOCK_FORMAT
1577#endif
1578}
1579
1580
1581/* caller needs to free etype_s */
1582 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1583 krb5_enctype enctype,
1584 char **etype_s)
1585{
1586#ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1587 return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1588#elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1589 char buf[256];
1590 krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1591 if (ret) {
1592 return ret;
1593 }
1594 *etype_s = SMB_STRDUP(buf);
1595 if (!*etype_s) {
1596 return ENOMEM;
1597 }
1598 return ret;
1599#else
1600#error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1601#endif
1602}
1603
1604 krb5_error_code smb_krb5_mk_error(krb5_context context,
1605 krb5_error_code error_code,
1606 const krb5_principal server,
1607 krb5_data *reply)
1608{
1609#ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1610 /*
1611 * The MIT interface is *terrible*.
1612 * We have to construct this ourselves...
1613 */
1614 krb5_error e;
1615
1616 memset(&e, 0, sizeof(e));
1617 krb5_us_timeofday(context, &e.stime, &e.susec);
1618 e.server = server;
1619#if defined(krb5_err_base)
1620 e.error = error_code - krb5_err_base;
1621#elif defined(ERROR_TABLE_BASE_krb5)
1622 e.error = error_code - ERROR_TABLE_BASE_krb5;
1623#else
1624 e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1625#endif
1626
1627 return krb5_mk_error(context, &e, reply);
1628#else /* Heimdal. */
1629 return krb5_mk_error(context,
1630 error_code,
1631 NULL,
1632 NULL, /* e_data */
1633 NULL,
1634 server,
1635 NULL,
1636 NULL,
1637 reply);
1638#endif
1639}
1640
1641/**********************************************************************
1642 * Open a krb5 keytab with flags, handles readonly or readwrite access and
1643 * allows to process non-default keytab names.
1644 * @param context krb5_context
1645 * @param keytab_name_req string
1646 * @param write_access bool if writable keytab is required
1647 * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1648 * @return krb5_error_code
1649**********************************************************************/
1650
1651/* This MAX_NAME_LEN is a constant defined in krb5.h */
1652#ifndef MAX_KEYTAB_NAME_LEN
1653#define MAX_KEYTAB_NAME_LEN 1100
1654#endif
1655
1656 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1657 const char *keytab_name_req,
1658 bool write_access,
1659 krb5_keytab *keytab)
1660{
1661 krb5_error_code ret = 0;
1662 TALLOC_CTX *mem_ctx;
1663 char keytab_string[MAX_KEYTAB_NAME_LEN];
1664 char *kt_str = NULL;
1665 bool found_valid_name = False;
1666 const char *pragma = "FILE";
1667 const char *tmp = NULL;
1668
1669 if (!write_access && !keytab_name_req) {
1670 /* caller just wants to read the default keytab readonly, so be it */
1671 return krb5_kt_default(context, keytab);
1672 }
1673
1674 mem_ctx = talloc_init("smb_krb5_open_keytab");
1675 if (!mem_ctx) {
1676 return ENOMEM;
1677 }
1678
1679#ifdef HAVE_WRFILE_KEYTAB
1680 if (write_access) {
1681 pragma = "WRFILE";
1682 }
1683#endif
1684
1685 if (keytab_name_req) {
1686
1687 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1688 ret = KRB5_CONFIG_NOTENUFSPACE;
1689 goto out;
1690 }
1691
1692 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1693 (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1694 tmp = keytab_name_req;
1695 goto resolve;
1696 }
1697
1698 if (keytab_name_req[0] != '/') {
1699 ret = KRB5_KT_BADNAME;
1700 goto out;
1701 }
1702
1703 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1704 if (!tmp) {
1705 ret = ENOMEM;
1706 goto out;
1707 }
1708
1709 goto resolve;
1710 }
1711
1712 /* we need to handle more complex keytab_strings, like:
1713 * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1714
1715 ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1716 if (ret) {
1717 goto out;
1718 }
1719
1720 DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1721
1722 tmp = talloc_strdup(mem_ctx, keytab_string);
1723 if (!tmp) {
1724 ret = ENOMEM;
1725 goto out;
1726 }
1727
1728 if (strncmp(tmp, "ANY:", 4) == 0) {
1729 tmp += 4;
1730 }
1731
1732 memset(&keytab_string, '\0', sizeof(keytab_string));
1733
1734 while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1735 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1736 found_valid_name = True;
1737 tmp = kt_str;
1738 tmp += 7;
1739 }
1740
1741 if (strncmp(kt_str, "FILE:", 5) == 0) {
1742 found_valid_name = True;
1743 tmp = kt_str;
1744 tmp += 5;
1745 }
1746
1747 if (found_valid_name) {
1748 if (tmp[0] != '/') {
1749 ret = KRB5_KT_BADNAME;
1750 goto out;
1751 }
1752
1753 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1754 if (!tmp) {
1755 ret = ENOMEM;
1756 goto out;
1757 }
1758 break;
1759 }
1760 }
1761
1762 if (!found_valid_name) {
1763 ret = KRB5_KT_UNKNOWN_TYPE;
1764 goto out;
1765 }
1766
1767 resolve:
1768 DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1769 ret = krb5_kt_resolve(context, tmp, keytab);
1770
1771 out:
1772 TALLOC_FREE(mem_ctx);
1773 return ret;
1774}
1775
1776#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)
1777/**************************************************************
1778Routine: ads_krb5_get_fwd_ticket
1779 Description:
1780 When a service ticket is flagged as trusted
1781 for delegation we should provide a forwardable
1782 ticket so that the remote host can act on our
1783 behalf. This is done by taking the 2nd forwardable
1784 TGT and storing it in the GSS-API authenticator
1785 "checksum". This routine will populate
1786 the krb5_data authenticator with this TGT.
1787 Parameters:
1788 krb5_context context: The kerberos context for this authentication.
1789 krb5_auth_context: The authentication context.
1790 krb5_creds *credsp: The ticket credentials (AS-REP).
1791 krb5_ccache ccache: The credentials cache.
1792 krb5_data &authenticator: The checksum field that will store the TGT, and
1793 authenticator.data must be freed by the caller.
1794
1795 Returns:
1796 krb5_error_code: 0 if no errors, otherwise set.
1797**************************************************************/
1798
1799static krb5_error_code ads_krb5_get_fwd_ticket( krb5_context context,
1800 krb5_auth_context *auth_context,
1801 krb5_creds *credsp,
1802 krb5_ccache ccache,
1803 krb5_data *authenticator)
1804{
1805 krb5_data fwdData;
1806 krb5_error_code retval = 0;
1807 char *pChksum = NULL;
1808 char *p = NULL;
1809
1810 ZERO_STRUCT(fwdData);
1811 ZERO_STRUCTP(authenticator);
1812
1813 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
1814 *auth_context, /* Authentication context [in] */
1815 CONST_DISCARD(char *, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
1816 credsp->client, /* Client principal for the tgt [in] */
1817 credsp->server, /* Server principal for the tgt [in] */
1818 ccache, /* Credential cache to use for storage [in] */
1819 1, /* Turn on for "Forwardable ticket" [in] */
1820 &fwdData ); /* Resulting response [out] */
1821
1822
1823 if (retval) {
1824 DEBUG(1,("ads_krb5_get_fwd_ticket: krb5_fwd_tgt_creds failed (%s)\n",
1825 error_message(retval)));
1826 goto out;
1827 }
1828
1829 if ((unsigned int)GSSAPI_CHECKSUM_SIZE + (unsigned int)fwdData.length <
1830 (unsigned int)GSSAPI_CHECKSUM_SIZE) {
1831 retval = EINVAL;
1832 goto out;
1833 }
1834
1835 /* We're going to allocate a gssChecksum structure with a little
1836 extra data the length of the kerberos credentials length
1837 (APPLICATION 22) so that we can pack it on the end of the structure.
1838 */
1839
1840 pChksum = (char *)SMB_MALLOC(GSSAPI_CHECKSUM_SIZE + fwdData.length );
1841 if (!pChksum) {
1842 retval = ENOMEM;
1843 goto out;
1844 }
1845
1846 p = pChksum;
1847
1848 SIVAL(p, 0, GSSAPI_BNDLENGTH);
1849 p += 4;
1850
1851 /* Zero out the bindings fields */
1852 memset(p, '\0', GSSAPI_BNDLENGTH );
1853 p += GSSAPI_BNDLENGTH;
1854
1855 SIVAL(p, 0, GSS_C_DELEG_FLAG );
1856 p += 4;
1857 SSVAL(p, 0, 1 );
1858 p += 2;
1859 SSVAL(p, 0, fwdData.length );
1860 p += 2;
1861
1862 /* Migrate the kerberos KRB_CRED data to the checksum delegation */
1863 memcpy(p, fwdData.data, fwdData.length );
1864 p += fwdData.length;
1865
1866 /* We need to do this in order to allow our GSS-API */
1867 retval = krb5_auth_con_set_req_cksumtype( context, *auth_context, GSSAPI_CHECKSUM );
1868 if (retval) {
1869 goto out;
1870 }
1871
1872 /* We now have a service ticket, now turn it into an AP-REQ. */
1873 authenticator->length = fwdData.length + GSSAPI_CHECKSUM_SIZE;
1874
1875 /* Caller should call free() when they're done with this. */
1876 authenticator->data = (char *)pChksum;
1877
1878 out:
1879
1880 /* Remove that input data, we never needed it anyway. */
1881 if (fwdData.length > 0) {
1882 krb5_free_data_contents( context, &fwdData );
1883 }
1884
1885 return retval;
1886}
1887#endif
1888
1889#else /* HAVE_KRB5 */
1890 /* this saves a few linking headaches */
1891 int cli_krb5_get_ticket(const char *principal, time_t time_offset,
1892 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, uint32 extra_ap_opts,
1893 const char *ccname, time_t *tgs_expire)
1894{
1895 DEBUG(0,("NO KERBEROS SUPPORT\n"));
1896 return 1;
1897}
1898
1899#endif
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