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Reserve IOCTL 0xACE for proxy<->proxy communication channel
[Samba/vfs_proxy.git] / source3 / libsmb / clikrb5.c
blob9f86b8b2f85df70570ec6f42e97395606ad22207
1 /*
2 Unix SMB/CIFS implementation.
3 simple kerberos5 routines for active directory
4 Copyright (C) Andrew Tridgell 2001
5 Copyright (C) Luke Howard 2002-2003
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
7 Copyright (C) Guenther Deschner 2005-2007
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 */
22
23 #define KRB5_PRIVATE 1 /* this file uses PRIVATE interfaces! */
24 #define KRB5_DEPRECATED 1 /* this file uses DEPRECATED interfaces! */
25
26 #include "includes.h"
27
28 #ifdef HAVE_KRB5
29
30 #define GSSAPI_CHECKSUM 0x8003 /* Checksum type value for Kerberos */
31 #define GSSAPI_BNDLENGTH 16 /* Bind Length (rfc-1964 pg.3) */
32 #define GSSAPI_CHECKSUM_SIZE (12+GSSAPI_BNDLENGTH)
33
34 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_FWD_TGT_CREDS) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY)
35 static krb5_error_code ads_krb5_get_fwd_ticket( krb5_context context,
36 krb5_auth_context *auth_context,
37 krb5_creds *credsp,
38 krb5_ccache ccache,
39 krb5_data *authenticator);
40 #endif
41
42 /**************************************************************
43 Wrappers around kerberos string functions that convert from
44 utf8 -> unix charset and vica versa.
45 **************************************************************/
46
47 /**************************************************************
48 krb5_parse_name that takes a UNIX charset.
49 **************************************************************/
50
51 krb5_error_code smb_krb5_parse_name(krb5_context context,
52 const char *name, /* in unix charset */
53 krb5_principal *principal)
54 {
55 krb5_error_code ret;
56 char *utf8_name;
57 size_t converted_size;
58
59 if (!push_utf8_allocate(&utf8_name, name, &converted_size)) {
60 return ENOMEM;
61 }
62
63 ret = krb5_parse_name(context, utf8_name, principal);
64 SAFE_FREE(utf8_name);
65 return ret;
66 }
67
68 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
69 /**************************************************************
70 krb5_parse_name_norealm that takes a UNIX charset.
71 **************************************************************/
72
73 static krb5_error_code smb_krb5_parse_name_norealm_conv(krb5_context context,
74 const char *name, /* in unix charset */
75 krb5_principal *principal)
76 {
77 krb5_error_code ret;
78 char *utf8_name;
79 size_t converted_size;
80
81 *principal = NULL;
82 if (!push_utf8_allocate(&utf8_name, name, &converted_size)) {
83 return ENOMEM;
84 }
85
86 ret = krb5_parse_name_norealm(context, utf8_name, principal);
87 SAFE_FREE(utf8_name);
88 return ret;
89 }
90 #endif
91
92 /**************************************************************
93 krb5_parse_name that returns a UNIX charset name. Must
94 be freed with normal free() call.
95 **************************************************************/
96
97 krb5_error_code smb_krb5_unparse_name(krb5_context context,
98 krb5_const_principal principal,
99 char **unix_name)
100 {
101 krb5_error_code ret;
102 char *utf8_name;
103 size_t converted_size;
104
105 *unix_name = NULL;
106 ret = krb5_unparse_name(context, principal, &utf8_name);
107 if (ret) {
108 return ret;
109 }
110
111 if (!pull_utf8_allocate(unix_name, utf8_name, &converted_size)) {
112 krb5_free_unparsed_name(context, utf8_name);
113 return ENOMEM;
114 }
115 krb5_free_unparsed_name(context, utf8_name);
116 return 0;
117 }
118
119 #ifndef HAVE_KRB5_SET_REAL_TIME
120 /*
121 * This function is not in the Heimdal mainline.
122 */
123 krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds)
124 {
125 krb5_error_code ret;
126 int32_t sec, usec;
127
128 ret = krb5_us_timeofday(context, &sec, &usec);
129 if (ret)
130 return ret;
131
132 context->kdc_sec_offset = seconds - sec;
133 context->kdc_usec_offset = microseconds - usec;
134
135 return 0;
136 }
137 #endif
138
139 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
140
141 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
142
143 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
144 * to krb5_set_default_tgs_ktypes. See
145 * http://lists.samba.org/archive/samba-technical/2006-July/048271.html
146 *
147 * If the MIT libraries are not exporting internal symbols, we will end up in
148 * this branch, which is correct. Otherwise we will continue to use the
149 * internal symbol
150 */
151 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
152 {
153 return krb5_set_default_tgs_enctypes(ctx, enc);
154 }
155
156 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
157
158 /* Heimdal */
159 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
160 {
161 return krb5_set_default_in_tkt_etypes(ctx, enc);
162 }
163
164 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
165
166 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
167
168 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
169 /* HEIMDAL */
170 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
171 {
172 memset(pkaddr, '\0', sizeof(krb5_address));
173 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
174 if (paddr->ss_family == AF_INET6) {
175 pkaddr->addr_type = KRB5_ADDRESS_INET6;
176 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
177 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
178 return true;
179 }
180 #endif
181 if (paddr->ss_family == AF_INET) {
182 pkaddr->addr_type = KRB5_ADDRESS_INET;
183 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
184 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
185 return true;
186 }
187 return false;
188 }
189 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
190 /* MIT */
191 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
192 {
193 memset(pkaddr, '\0', sizeof(krb5_address));
194 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
195 if (paddr->ss_family == AF_INET6) {
196 pkaddr->addrtype = ADDRTYPE_INET6;
197 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
198 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
199 return true;
200 }
201 #endif
202 if (paddr->ss_family == AF_INET) {
203 pkaddr->addrtype = ADDRTYPE_INET;
204 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
205 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
206 return true;
207 }
208 return false;
209 }
210 #else
211 #error UNKNOWN_ADDRTYPE
212 #endif
213
214 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY) && defined(HAVE_KRB5_ENCRYPT_BLOCK)
215 static int create_kerberos_key_from_string_direct(krb5_context context,
216 krb5_principal host_princ,
217 krb5_data *password,
218 krb5_keyblock *key,
219 krb5_enctype enctype)
220 {
221 int ret = 0;
222 krb5_data salt;
223 krb5_encrypt_block eblock;
224
225 ret = krb5_principal2salt(context, host_princ, &salt);
226 if (ret) {
227 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
228 return ret;
229 }
230 krb5_use_enctype(context, &eblock, enctype);
231 ret = krb5_string_to_key(context, &eblock, key, password, &salt);
232 SAFE_FREE(salt.data);
233
234 return ret;
235 }
236 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
237 static int create_kerberos_key_from_string_direct(krb5_context context,
238 krb5_principal host_princ,
239 krb5_data *password,
240 krb5_keyblock *key,
241 krb5_enctype enctype)
242 {
243 int ret;
244 krb5_salt salt;
245
246 ret = krb5_get_pw_salt(context, host_princ, &salt);
247 if (ret) {
248 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
249 return ret;
250 }
251
252 ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
253 krb5_free_salt(context, salt);
254
255 return ret;
256 }
257 #else
258 #error UNKNOWN_CREATE_KEY_FUNCTIONS
259 #endif
260
261 int create_kerberos_key_from_string(krb5_context context,
262 krb5_principal host_princ,
263 krb5_data *password,
264 krb5_keyblock *key,
265 krb5_enctype enctype,
266 bool no_salt)
267 {
268 krb5_principal salt_princ = NULL;
269 int ret;
270 /*
271 * Check if we've determined that the KDC is salting keys for this
272 * principal/enctype in a non-obvious way. If it is, try to match
273 * its behavior.
274 */
275 if (no_salt) {
276 KRB5_KEY_DATA(key) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
277 if (!KRB5_KEY_DATA(key)) {
278 return ENOMEM;
279 }
280 memcpy(KRB5_KEY_DATA(key), password->data, password->length);
281 KRB5_KEY_LENGTH(key) = password->length;
282 KRB5_KEY_TYPE(key) = enctype;
283 return 0;
284 }
285 salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype);
286 ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype);
287 if (salt_princ) {
288 krb5_free_principal(context, salt_princ);
289 }
290 return ret;
291 }
292
293 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
294 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
295 krb5_enctype **enctypes)
296 {
297 return krb5_get_permitted_enctypes(context, enctypes);
298 }
299 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
300 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
301 krb5_enctype **enctypes)
302 {
303 return krb5_get_default_in_tkt_etypes(context, enctypes);
304 }
305 #else
306 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
307 #endif
308
309 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
310 krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
311 krb5_auth_context auth_context,
312 krb5_keyblock *keyblock)
313 {
314 return krb5_auth_con_setkey(context, auth_context, keyblock);
315 }
316 #endif
317
318 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
319 DATA_BLOB *edata,
320 DATA_BLOB *edata_out)
321 {
322 DATA_BLOB edata_contents;
323 ASN1_DATA *data;
324 int edata_type;
325
326 if (!edata->length) {
327 return False;
328 }
329
330 data = asn1_init(mem_ctx);
331 if (data == NULL) {
332 return false;
333 }
334
335 asn1_load(data, *edata);
336 asn1_start_tag(data, ASN1_SEQUENCE(0));
337 asn1_start_tag(data, ASN1_CONTEXT(1));
338 asn1_read_Integer(data, &edata_type);
339
340 if (edata_type != KRB5_PADATA_PW_SALT) {
341 DEBUG(0,("edata is not of required type %d but of type %d\n",
342 KRB5_PADATA_PW_SALT, edata_type));
343 asn1_free(data);
344 return False;
345 }
346
347 asn1_start_tag(data, ASN1_CONTEXT(2));
348 asn1_read_OctetString(data, NULL, &edata_contents);
349 asn1_end_tag(data);
350 asn1_end_tag(data);
351 asn1_end_tag(data);
352 asn1_free(data);
353
354 *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
355
356 data_blob_free(&edata_contents);
357
358 return True;
359 }
360
361
362 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
363 {
364 DATA_BLOB pac_contents;
365 ASN1_DATA *data;
366 int data_type;
367
368 if (!auth_data->length) {
369 return False;
370 }
371
372 data = asn1_init(mem_ctx);
373 if (data == NULL) {
374 return false;
375 }
376
377 asn1_load(data, *auth_data);
378 asn1_start_tag(data, ASN1_SEQUENCE(0));
379 asn1_start_tag(data, ASN1_SEQUENCE(0));
380 asn1_start_tag(data, ASN1_CONTEXT(0));
381 asn1_read_Integer(data, &data_type);
382
383 if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) {
384 DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type));
385 asn1_free(data);
386 return False;
387 }
388
389 asn1_end_tag(data);
390 asn1_start_tag(data, ASN1_CONTEXT(1));
391 asn1_read_OctetString(data, NULL, &pac_contents);
392 asn1_end_tag(data);
393 asn1_end_tag(data);
394 asn1_end_tag(data);
395 asn1_free(data);
396
397 *unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length);
398
399 data_blob_free(&pac_contents);
400
401 return True;
402 }
403
404 bool get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt)
405 {
406 DATA_BLOB auth_data_wrapped;
407 bool got_auth_data_pac = False;
408 int i;
409
410 #if defined(HAVE_KRB5_TKT_ENC_PART2)
411 if (tkt->enc_part2 && tkt->enc_part2->authorization_data &&
412 tkt->enc_part2->authorization_data[0] &&
413 tkt->enc_part2->authorization_data[0]->length)
414 {
415 for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) {
416
417 if (tkt->enc_part2->authorization_data[i]->ad_type !=
418 KRB5_AUTHDATA_IF_RELEVANT) {
419 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
420 tkt->enc_part2->authorization_data[i]->ad_type));
421 continue;
422 }
423
424 auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents,
425 tkt->enc_part2->authorization_data[i]->length);
426
427 /* check if it is a PAC */
428 got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
429 data_blob_free(&auth_data_wrapped);
430
431 if (got_auth_data_pac) {
432 return true;
433 }
434 }
435
436 return got_auth_data_pac;
437 }
438
439 #else
440 if (tkt->ticket.authorization_data &&
441 tkt->ticket.authorization_data->len)
442 {
443 for (i = 0; i < tkt->ticket.authorization_data->len; i++) {
444
445 if (tkt->ticket.authorization_data->val[i].ad_type !=
446 KRB5_AUTHDATA_IF_RELEVANT) {
447 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
448 tkt->ticket.authorization_data->val[i].ad_type));
449 continue;
450 }
451
452 auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data,
453 tkt->ticket.authorization_data->val[i].ad_data.length);
454
455 /* check if it is a PAC */
456 got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
457 data_blob_free(&auth_data_wrapped);
458
459 if (got_auth_data_pac) {
460 return true;
461 }
462 }
463
464 return got_auth_data_pac;
465 }
466 #endif
467 return False;
468 }
469
470 krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
471 {
472 #if defined(HAVE_KRB5_TKT_ENC_PART2)
473 return tkt->enc_part2->client;
474 #else
475 return tkt->client;
476 #endif
477 }
478
479 #if !defined(HAVE_KRB5_LOCATE_KDC)
480
481 /* krb5_locate_kdc is an internal MIT symbol. MIT are not yet willing to commit
482 * to a public interface for this functionality, so we have to be able to live
483 * without it if the MIT libraries are hiding their internal symbols.
484 */
485
486 #if defined(KRB5_KRBHST_INIT)
487 /* Heimdal */
488 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters)
489 {
490 krb5_krbhst_handle hnd;
491 krb5_krbhst_info *hinfo;
492 krb5_error_code rc;
493 int num_kdcs, i;
494 struct sockaddr *sa;
495 struct addrinfo *ai;
496
497 *addr_pp = NULL;
498 *naddrs = 0;
499
500 rc = krb5_krbhst_init(ctx, realm->data, KRB5_KRBHST_KDC, &hnd);
501 if (rc) {
502 DEBUG(0, ("smb_krb5_locate_kdc: krb5_krbhst_init failed (%s)\n", error_message(rc)));
503 return rc;
504 }
505
506 for ( num_kdcs = 0; (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); num_kdcs++)
507 ;
508
509 krb5_krbhst_reset(ctx, hnd);
510
511 if (!num_kdcs) {
512 DEBUG(0, ("smb_krb5_locate_kdc: zero kdcs found !\n"));
513 krb5_krbhst_free(ctx, hnd);
514 return -1;
515 }
516
517 sa = SMB_MALLOC_ARRAY( struct sockaddr, num_kdcs );
518 if (!sa) {
519 DEBUG(0, ("smb_krb5_locate_kdc: malloc failed\n"));
520 krb5_krbhst_free(ctx, hnd);
521 naddrs = 0;
522 return -1;
523 }
524
525 memset(sa, '\0', sizeof(struct sockaddr) * num_kdcs );
526
527 for (i = 0; i < num_kdcs && (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); i++) {
528
529 #if defined(HAVE_KRB5_KRBHST_GET_ADDRINFO)
530 rc = krb5_krbhst_get_addrinfo(ctx, hinfo, &ai);
531 if (rc) {
532 DEBUG(0,("krb5_krbhst_get_addrinfo failed: %s\n", error_message(rc)));
533 continue;
534 }
535 #endif
536 if (hinfo->ai && hinfo->ai->ai_family == AF_INET)
537 memcpy(&sa[i], hinfo->ai->ai_addr, sizeof(struct sockaddr));
538 }
539
540 krb5_krbhst_free(ctx, hnd);
541
542 *naddrs = num_kdcs;
543 *addr_pp = sa;
544 return 0;
545 }
546
547 #else /* ! defined(KRB5_KRBHST_INIT) */
548
549 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
550 struct sockaddr **addr_pp, int *naddrs, int get_masters)
551 {
552 DEBUG(0, ("unable to explicitly locate the KDC on this platform\n"));
553 return KRB5_KDC_UNREACH;
554 }
555
556 #endif /* KRB5_KRBHST_INIT */
557
558 #else /* ! HAVE_KRB5_LOCATE_KDC */
559
560 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
561 struct sockaddr **addr_pp, int *naddrs, int get_masters)
562 {
563 return krb5_locate_kdc(ctx, realm, addr_pp, naddrs, get_masters);
564 }
565
566 #endif /* HAVE_KRB5_LOCATE_KDC */
567
568 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
569 void krb5_free_unparsed_name(krb5_context context, char *val)
570 {
571 SAFE_FREE(val);
572 }
573 #endif
574
575 void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
576 {
577 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
578 if (pdata->data) {
579 krb5_free_data_contents(context, pdata);
580 }
581 #else
582 SAFE_FREE(pdata->data);
583 #endif
584 }
585
586 void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype)
587 {
588 #if defined(HAVE_KRB5_KEYBLOCK_IN_CREDS)
589 KRB5_KEY_TYPE((&pcreds->keyblock)) = enctype;
590 #elif defined(HAVE_KRB5_SESSION_IN_CREDS)
591 KRB5_KEY_TYPE((&pcreds->session)) = enctype;
592 #else
593 #error UNKNOWN_KEYBLOCK_MEMBER_IN_KRB5_CREDS_STRUCT
594 #endif
595 }
596
597 bool kerberos_compatible_enctypes(krb5_context context,
598 krb5_enctype enctype1,
599 krb5_enctype enctype2)
600 {
601 #if defined(HAVE_KRB5_C_ENCTYPE_COMPARE)
602 krb5_boolean similar = 0;
603
604 krb5_c_enctype_compare(context, enctype1, enctype2, &similar);
605 return similar ? True : False;
606 #elif defined(HAVE_KRB5_ENCTYPES_COMPATIBLE_KEYS)
607 return krb5_enctypes_compatible_keys(context, enctype1, enctype2) ? True : False;
608 #endif
609 }
610
611 static bool ads_cleanup_expired_creds(krb5_context context,
612 krb5_ccache ccache,
613 krb5_creds *credsp)
614 {
615 krb5_error_code retval;
616 const char *cc_type = krb5_cc_get_type(context, ccache);
617
618 DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
619 cc_type, krb5_cc_get_name(context, ccache),
620 http_timestring(talloc_tos(), credsp->times.endtime)));
621
622 /* we will probably need new tickets if the current ones
623 will expire within 10 seconds.
624 */
625 if (credsp->times.endtime >= (time(NULL) + 10))
626 return False;
627
628 /* heimdal won't remove creds from a file ccache, and
629 perhaps we shouldn't anyway, since internally we
630 use memory ccaches, and a FILE one probably means that
631 we're using creds obtained outside of our exectuable
632 */
633 if (strequal(cc_type, "FILE")) {
634 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
635 return False;
636 }
637
638 retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
639 if (retval) {
640 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
641 error_message(retval)));
642 /* If we have an error in this, we want to display it,
643 but continue as though we deleted it */
644 }
645 return True;
646 }
647
648 /*
649 we can't use krb5_mk_req because w2k wants the service to be in a particular format
650 */
651 static krb5_error_code ads_krb5_mk_req(krb5_context context,
652 krb5_auth_context *auth_context,
653 const krb5_flags ap_req_options,
654 const char *principal,
655 krb5_ccache ccache,
656 krb5_data *outbuf,
657 time_t *expire_time)
658 {
659 krb5_error_code retval;
660 krb5_principal server;
661 krb5_creds * credsp;
662 krb5_creds creds;
663 krb5_data in_data;
664 bool creds_ready = False;
665 int i = 0, maxtries = 3;
666
667 ZERO_STRUCT(in_data);
668
669 retval = smb_krb5_parse_name(context, principal, &server);
670 if (retval) {
671 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
672 return retval;
673 }
674
675 /* obtain ticket & session key */
676 ZERO_STRUCT(creds);
677 if ((retval = krb5_copy_principal(context, server, &creds.server))) {
678 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
679 error_message(retval)));
680 goto cleanup_princ;
681 }
682
683 if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
684 /* This can commonly fail on smbd startup with no ticket in the cache.
685 * Report at higher level than 1. */
686 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
687 error_message(retval)));
688 goto cleanup_creds;
689 }
690
691 while (!creds_ready && (i < maxtries)) {
692
693 if ((retval = krb5_get_credentials(context, 0, ccache,
694 &creds, &credsp))) {
695 DEBUG(1,("ads_krb5_mk_req: krb5_get_credentials failed for %s (%s)\n",
696 principal, error_message(retval)));
697 goto cleanup_creds;
698 }
699
700 /* cope with ticket being in the future due to clock skew */
701 if ((unsigned)credsp->times.starttime > time(NULL)) {
702 time_t t = time(NULL);
703 int time_offset =(int)((unsigned)credsp->times.starttime-t);
704 DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
705 krb5_set_real_time(context, t + time_offset + 1, 0);
706 }
707
708 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
709 creds_ready = True;
710 }
711
712 i++;
713 }
714
715 DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
716 principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
717 http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
718 (unsigned)credsp->times.endtime));
719
720 if (expire_time) {
721 *expire_time = (time_t)credsp->times.endtime;
722 }
723
724 #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)
725 if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
726 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
727 as part of the kerberos exchange. */
728
729 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n") );
730
731 if( *auth_context == NULL ) {
732 /* Allocate if it has not yet been allocated. */
733 retval = krb5_auth_con_init( context, auth_context );
734 if (retval) {
735 DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_init failed (%s)\n",
736 error_message(retval)));
737 goto cleanup_creds;
738 }
739 }
740
741 retval = krb5_auth_con_setuseruserkey( context, *auth_context, &credsp->keyblock );
742 if (retval) {
743 DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_setuseruserkey failed (%s)\n",
744 error_message(retval)));
745 goto cleanup_creds;
746 }
747
748 /* Must use a subkey for forwarded tickets. */
749 retval = krb5_auth_con_setflags( context, *auth_context, KRB5_AUTH_CONTEXT_USE_SUBKEY);
750 if (retval) {
751 DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_setflags failed (%s)\n",
752 error_message(retval)));
753 goto cleanup_creds;
754 }
755
756 retval = ads_krb5_get_fwd_ticket( context,
757 auth_context,
758 credsp,
759 ccache,
760 &in_data );
761 if (retval) {
762 DEBUG( 3, ("ads_krb5_get_fwd_ticket failed (%s)\n",
763 error_message( retval ) ) );
764
765 /*
766 * This is not fatal. Delete the *auth_context and continue
767 * with krb5_mk_req_extended to get a non-forwardable ticket.
768 */
769
770 if (in_data.data) {
771 free( in_data.data );
772 in_data.data = NULL;
773 in_data.length = 0;
774 }
775 krb5_auth_con_free(context, *auth_context);
776 *auth_context = NULL;
777 }
778 }
779 #endif
780
781 retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
782 &in_data, credsp, outbuf);
783 if (retval) {
784 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
785 error_message(retval)));
786 }
787
788 if (in_data.data) {
789 free( in_data.data );
790 in_data.length = 0;
791 }
792
793 krb5_free_creds(context, credsp);
794
795 cleanup_creds:
796 krb5_free_cred_contents(context, &creds);
797
798 cleanup_princ:
799 krb5_free_principal(context, server);
800
801 return retval;
802 }
803
804 /*
805 get a kerberos5 ticket for the given service
806 */
807 int cli_krb5_get_ticket(const char *principal, time_t time_offset,
808 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
809 uint32 extra_ap_opts, const char *ccname,
810 time_t *tgs_expire)
811
812 {
813 krb5_error_code retval;
814 krb5_data packet;
815 krb5_context context = NULL;
816 krb5_ccache ccdef = NULL;
817 krb5_auth_context auth_context = NULL;
818 krb5_enctype enc_types[] = {
819 #ifdef ENCTYPE_ARCFOUR_HMAC
820 ENCTYPE_ARCFOUR_HMAC,
821 #endif
822 ENCTYPE_DES_CBC_MD5,
823 ENCTYPE_DES_CBC_CRC,
824 ENCTYPE_NULL};
825
826 initialize_krb5_error_table();
827 retval = krb5_init_context(&context);
828 if (retval) {
829 DEBUG(1,("cli_krb5_get_ticket: krb5_init_context failed (%s)\n",
830 error_message(retval)));
831 goto failed;
832 }
833
834 if (time_offset != 0) {
835 krb5_set_real_time(context, time(NULL) + time_offset, 0);
836 }
837
838 if ((retval = krb5_cc_resolve(context, ccname ?
839 ccname : krb5_cc_default_name(context), &ccdef))) {
840 DEBUG(1,("cli_krb5_get_ticket: krb5_cc_default failed (%s)\n",
841 error_message(retval)));
842 goto failed;
843 }
844
845 if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
846 DEBUG(1,("cli_krb5_get_ticket: krb5_set_default_tgs_ktypes failed (%s)\n",
847 error_message(retval)));
848 goto failed;
849 }
850
851 if ((retval = ads_krb5_mk_req(context,
852 &auth_context,
853 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
854 principal,
855 ccdef, &packet,
856 tgs_expire))) {
857 goto failed;
858 }
859
860 get_krb5_smb_session_key(context, auth_context, session_key_krb5, False);
861
862 *ticket = data_blob(packet.data, packet.length);
863
864 kerberos_free_data_contents(context, &packet);
865
866 failed:
867
868 if ( context ) {
869 if (ccdef)
870 krb5_cc_close(context, ccdef);
871 if (auth_context)
872 krb5_auth_con_free(context, auth_context);
873 krb5_free_context(context);
874 }
875
876 return retval;
877 }
878
879 bool get_krb5_smb_session_key(krb5_context context, krb5_auth_context auth_context, DATA_BLOB *session_key, bool remote)
880 {
881 krb5_keyblock *skey;
882 krb5_error_code err;
883 bool ret = False;
884
885 if (remote)
886 err = krb5_auth_con_getremotesubkey(context, auth_context, &skey);
887 else
888 err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey);
889 if (err == 0 && skey != NULL) {
890 DEBUG(10, ("Got KRB5 session key of length %d\n", (int)KRB5_KEY_LENGTH(skey)));
891 *session_key = data_blob(KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
892 dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
893
894 ret = True;
895
896 krb5_free_keyblock(context, skey);
897 } else {
898 DEBUG(10, ("KRB5 error getting session key %d\n", err));
899 }
900
901 return ret;
902 }
903
904
905 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
906 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
907
908 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
909 {
910 static krb5_data kdata;
911
912 kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
913 kdata.length = strlen((const char *)kdata.data);
914 return &kdata;
915 }
916 #endif
917
918 krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
919 {
920 #if defined(HAVE_KRB5_KT_FREE_ENTRY)
921 return krb5_kt_free_entry(context, kt_entry);
922 #elif defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
923 return krb5_free_keytab_entry_contents(context, kt_entry);
924 #else
925 #error UNKNOWN_KT_FREE_FUNCTION
926 #endif
927 }
928
929 void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
930 struct PAC_SIGNATURE_DATA *sig)
931 {
932 #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
933 cksum->cksumtype = (krb5_cksumtype)sig->type;
934 cksum->checksum.length = sig->signature.length;
935 cksum->checksum.data = sig->signature.data;
936 #else
937 cksum->checksum_type = (krb5_cksumtype)sig->type;
938 cksum->length = sig->signature.length;
939 cksum->contents = sig->signature.data;
940 #endif
941 }
942
943 krb5_error_code smb_krb5_verify_checksum(krb5_context context,
944 const krb5_keyblock *keyblock,
945 krb5_keyusage usage,
946 krb5_checksum *cksum,
947 uint8 *data,
948 size_t length)
949 {
950 krb5_error_code ret;
951
952 /* verify the checksum */
953
954 /* welcome to the wonderful world of samba's kerberos abstraction layer:
955 *
956 * function heimdal 0.6.1rc3 heimdal 0.7 MIT krb 1.4.2
957 * -----------------------------------------------------------------------------
958 * krb5_c_verify_checksum - works works
959 * krb5_verify_checksum works (6 args) works (6 args) broken (7 args)
960 */
961
962 #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
963 {
964 krb5_boolean checksum_valid = False;
965 krb5_data input;
966
967 input.data = (char *)data;
968 input.length = length;
969
970 ret = krb5_c_verify_checksum(context,
971 keyblock,
972 usage,
973 &input,
974 cksum,
975 &checksum_valid);
976 if (ret) {
977 DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
978 error_message(ret)));
979 return ret;
980 }
981
982 if (!checksum_valid)
983 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
984 }
985
986 #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
987
988 /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
989 * without enctype and it ignores any key_usage types - Guenther */
990
991 {
992
993 krb5_crypto crypto;
994 ret = krb5_crypto_init(context,
995 keyblock,
996 0,
997 &crypto);
998 if (ret) {
999 DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
1000 error_message(ret)));
1001 return ret;
1002 }
1003
1004 ret = krb5_verify_checksum(context,
1005 crypto,
1006 usage,
1007 data,
1008 length,
1009 cksum);
1010
1011 krb5_crypto_destroy(context, crypto);
1012 }
1013
1014 #else
1015 #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
1016 #endif
1017
1018 return ret;
1019 }
1020
1021 time_t get_authtime_from_tkt(krb5_ticket *tkt)
1022 {
1023 #if defined(HAVE_KRB5_TKT_ENC_PART2)
1024 return tkt->enc_part2->times.authtime;
1025 #else
1026 return tkt->ticket.authtime;
1027 #endif
1028 }
1029
1030 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1031 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
1032 {
1033 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
1034 if (ap_req->ticket->enc_part.kvno)
1035 return ap_req->ticket->enc_part.kvno;
1036 #else /* Heimdal */
1037 if (ap_req->ticket.enc_part.kvno)
1038 return *ap_req->ticket.enc_part.kvno;
1039 #endif
1040 return 0;
1041 }
1042
1043 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
1044 {
1045 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
1046 return ap_req->ticket.enc_part.etype;
1047 #else /* MIT */
1048 return ap_req->ticket->enc_part.enctype;
1049 #endif
1050 }
1051 #endif /* HAVE_KRB5_DECODE_AP_REQ */
1052
1053 static krb5_error_code
1054 get_key_from_keytab(krb5_context context,
1055 krb5_const_principal server,
1056 krb5_enctype enctype,
1057 krb5_kvno kvno,
1058 krb5_keyblock **out_key)
1059 {
1060 krb5_keytab_entry entry;
1061 krb5_error_code ret;
1062 krb5_keytab keytab;
1063 char *name = NULL;
1064 krb5_keyblock *keyp;
1065
1066 /* We have to open a new keytab handle here, as MIT does
1067 an implicit open/getnext/close on krb5_kt_get_entry. We
1068 may be in the middle of a keytab enumeration when this is
1069 called. JRA. */
1070
1071 ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1072 if (ret) {
1073 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1074 return ret;
1075 }
1076
1077 if ( DEBUGLEVEL >= 10 ) {
1078 if (smb_krb5_unparse_name(context, server, &name) == 0) {
1079 DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1080 kvno, enctype, name));
1081 SAFE_FREE(name);
1082 }
1083 }
1084
1085 ret = krb5_kt_get_entry(context,
1086 keytab,
1087 server,
1088 kvno,
1089 enctype,
1090 &entry);
1091
1092 if (ret) {
1093 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1094 goto out;
1095 }
1096
1097 keyp = KRB5_KT_KEY(&entry);
1098
1099 ret = krb5_copy_keyblock(context, keyp, out_key);
1100 if (ret) {
1101 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1102 goto out;
1103 }
1104
1105 smb_krb5_kt_free_entry(context, &entry);
1106
1107 out:
1108 krb5_kt_close(context, keytab);
1109 return ret;
1110 }
1111
1112 /* Prototypes */
1113
1114 krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1115 const krb5_data *inbuf,
1116 krb5_kvno *kvno,
1117 krb5_enctype *enctype)
1118 {
1119 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1120 {
1121 krb5_error_code ret;
1122 krb5_ap_req ap_req;
1123
1124 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1125 if (ret)
1126 return ret;
1127
1128 *kvno = get_kvno_from_ap_req(&ap_req);
1129 *enctype = get_enctype_from_ap_req(&ap_req);
1130
1131 free_AP_REQ(&ap_req);
1132 return 0;
1133 }
1134 #endif
1135
1136 /* Possibly not an appropriate error code. */
1137 return KRB5KDC_ERR_BADOPTION;
1138 }
1139
1140 krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1141 krb5_auth_context *auth_context,
1142 const krb5_data *inbuf,
1143 krb5_const_principal server,
1144 krb5_keytab keytab,
1145 krb5_flags *ap_req_options,
1146 krb5_ticket **ticket,
1147 krb5_keyblock **keyblock)
1148 {
1149 krb5_error_code ret;
1150 krb5_kvno kvno;
1151 krb5_enctype enctype;
1152 krb5_keyblock *local_keyblock;
1153
1154 ret = krb5_rd_req(context,
1155 auth_context,
1156 inbuf,
1157 server,
1158 keytab,
1159 ap_req_options,
1160 ticket);
1161 if (ret) {
1162 return ret;
1163 }
1164
1165 #ifdef KRB5_TICKET_HAS_KEYINFO
1166 enctype = (*ticket)->enc_part.enctype;
1167 kvno = (*ticket)->enc_part.kvno;
1168 #else
1169 ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1170 if (ret) {
1171 return ret;
1172 }
1173 #endif
1174
1175 ret = get_key_from_keytab(context,
1176 server,
1177 enctype,
1178 kvno,
1179 &local_keyblock);
1180 if (ret) {
1181 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1182 goto out;
1183 }
1184
1185 out:
1186 if (ret && local_keyblock != NULL) {
1187 krb5_free_keyblock(context, local_keyblock);
1188 } else {
1189 *keyblock = local_keyblock;
1190 }
1191
1192 return ret;
1193 }
1194
1195 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1196 const char *name,
1197 krb5_principal *principal)
1198 {
1199 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1200 return smb_krb5_parse_name_norealm_conv(context, name, principal);
1201 #endif
1202
1203 /* we are cheating here because parse_name will in fact set the realm.
1204 * We don't care as the only caller of smb_krb5_parse_name_norealm
1205 * ignores the realm anyway when calling
1206 * smb_krb5_principal_compare_any_realm later - Guenther */
1207
1208 return smb_krb5_parse_name(context, name, principal);
1209 }
1210
1211 bool smb_krb5_principal_compare_any_realm(krb5_context context,
1212 krb5_const_principal princ1,
1213 krb5_const_principal princ2)
1214 {
1215 #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1216
1217 return krb5_principal_compare_any_realm(context, princ1, princ2);
1218
1219 /* krb5_princ_size is a macro in MIT */
1220 #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1221
1222 int i, len1, len2;
1223 const krb5_data *p1, *p2;
1224
1225 len1 = krb5_princ_size(context, princ1);
1226 len2 = krb5_princ_size(context, princ2);
1227
1228 if (len1 != len2)
1229 return False;
1230
1231 for (i = 0; i < len1; i++) {
1232
1233 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1234 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1235
1236 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1237 return False;
1238 }
1239
1240 return True;
1241 #else
1242 #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1243 #endif
1244 }
1245
1246 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, /* FILE:/tmp/krb5cc_0 */
1247 const char *client_string, /* gd@BER.SUSE.DE */
1248 const char *service_string, /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1249 time_t *expire_time)
1250 {
1251 krb5_error_code ret;
1252 krb5_context context = NULL;
1253 krb5_ccache ccache = NULL;
1254 krb5_principal client = NULL;
1255 krb5_creds creds, creds_in, *creds_out = NULL;
1256
1257 ZERO_STRUCT(creds);
1258 ZERO_STRUCT(creds_in);
1259
1260 initialize_krb5_error_table();
1261 ret = krb5_init_context(&context);
1262 if (ret) {
1263 goto done;
1264 }
1265
1266 if (!ccache_string) {
1267 ccache_string = krb5_cc_default_name(context);
1268 }
1269
1270 if (!ccache_string) {
1271 ret = EINVAL;
1272 goto done;
1273 }
1274
1275 DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1276
1277 /* FIXME: we should not fall back to defaults */
1278 ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1279 if (ret) {
1280 goto done;
1281 }
1282
1283 if (client_string) {
1284 ret = smb_krb5_parse_name(context, client_string, &client);
1285 if (ret) {
1286 goto done;
1287 }
1288 } else {
1289 ret = krb5_cc_get_principal(context, ccache, &client);
1290 if (ret) {
1291 goto done;
1292 }
1293 }
1294
1295 #ifdef HAVE_KRB5_GET_RENEWED_CREDS /* MIT */
1296 {
1297 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1298 if (ret) {
1299 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1300 goto done;
1301 }
1302 }
1303 #elif defined(HAVE_KRB5_GET_KDC_CRED) /* Heimdal */
1304 {
1305 krb5_kdc_flags flags;
1306 krb5_realm *client_realm = NULL;
1307
1308 ret = krb5_copy_principal(context, client, &creds_in.client);
1309 if (ret) {
1310 goto done;
1311 }
1312
1313 if (service_string) {
1314 ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1315 if (ret) {
1316 goto done;
1317 }
1318 } else {
1319 /* build tgt service by default */
1320 client_realm = krb5_princ_realm(context, creds_in.client);
1321 if (!client_realm) {
1322 ret = ENOMEM;
1323 goto done;
1324 }
1325 ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1326 if (ret) {
1327 goto done;
1328 }
1329 }
1330
1331 flags.i = 0;
1332 flags.b.renewable = flags.b.renew = True;
1333
1334 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1335 if (ret) {
1336 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1337 goto done;
1338 }
1339
1340 creds = *creds_out;
1341 }
1342 #else
1343 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1344 #endif
1345
1346 /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1347 ret = krb5_cc_initialize(context, ccache, client);
1348 if (ret) {
1349 goto done;
1350 }
1351
1352 ret = krb5_cc_store_cred(context, ccache, &creds);
1353
1354 if (expire_time) {
1355 *expire_time = (time_t) creds.times.endtime;
1356 }
1357
1358 done:
1359 krb5_free_cred_contents(context, &creds_in);
1360
1361 if (creds_out) {
1362 krb5_free_creds(context, creds_out);
1363 } else {
1364 krb5_free_cred_contents(context, &creds);
1365 }
1366
1367 if (client) {
1368 krb5_free_principal(context, client);
1369 }
1370 if (ccache) {
1371 krb5_cc_close(context, ccache);
1372 }
1373 if (context) {
1374 krb5_free_context(context);
1375 }
1376
1377 return ret;
1378 }
1379
1380 krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1381 {
1382 krb5_error_code ret = 0;
1383 if (addr == NULL) {
1384 return ret;
1385 }
1386 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1387 krb5_free_addresses(context, addr->addrs);
1388 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1389 ret = krb5_free_addresses(context, addr->addrs);
1390 SAFE_FREE(addr->addrs);
1391 #endif
1392 SAFE_FREE(addr);
1393 addr = NULL;
1394 return ret;
1395 }
1396
1397 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1398 {
1399 krb5_error_code ret = 0;
1400 nstring buf;
1401 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1402 krb5_address **addrs = NULL;
1403 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1404 krb5_addresses *addrs = NULL;
1405 #endif
1406
1407 *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1408 if (*kerb_addr == NULL) {
1409 return ENOMEM;
1410 }
1411
1412 put_name(buf, global_myname(), ' ', 0x20);
1413
1414 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1415 {
1416 int num_addr = 2;
1417
1418 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1419 if (addrs == NULL) {
1420 SAFE_FREE(kerb_addr);
1421 return ENOMEM;
1422 }
1423
1424 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1425
1426 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1427 if (addrs[0] == NULL) {
1428 SAFE_FREE(addrs);
1429 SAFE_FREE(kerb_addr);
1430 return ENOMEM;
1431 }
1432
1433 addrs[0]->magic = KV5M_ADDRESS;
1434 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1435 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1436 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1437 if (addrs[0]->contents == NULL) {
1438 SAFE_FREE(addrs[0]);
1439 SAFE_FREE(addrs);
1440 SAFE_FREE(kerb_addr);
1441 return ENOMEM;
1442 }
1443
1444 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1445
1446 addrs[1] = NULL;
1447 }
1448 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1449 {
1450 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1451 if (addrs == NULL) {
1452 SAFE_FREE(kerb_addr);
1453 return ENOMEM;
1454 }
1455
1456 memset(addrs, 0, sizeof(krb5_addresses));
1457
1458 addrs->len = 1;
1459 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1460 if (addrs->val == NULL) {
1461 SAFE_FREE(addrs);
1462 SAFE_FREE(kerb_addr);
1463 return ENOMEM;
1464 }
1465
1466 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1467 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1468 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1469 if (addrs->val[0].address.data == NULL) {
1470 SAFE_FREE(addrs->val);
1471 SAFE_FREE(addrs);
1472 SAFE_FREE(kerb_addr);
1473 return ENOMEM;
1474 }
1475
1476 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1477 }
1478 #else
1479 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1480 #endif
1481 (*kerb_addr)->addrs = addrs;
1482
1483 return ret;
1484 }
1485
1486 void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1487 {
1488 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1489 krb5_free_error_contents(context, krberror);
1490 #else /* MIT */
1491 krb5_free_error(context, krberror);
1492 #endif
1493 }
1494
1495 krb5_error_code handle_krberror_packet(krb5_context context,
1496 krb5_data *packet)
1497 {
1498 krb5_error_code ret;
1499 bool got_error_code = False;
1500
1501 DEBUG(10,("handle_krberror_packet: got error packet\n"));
1502
1503 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1504 {
1505 krb5_error krberror;
1506
1507 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1508 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1509 error_message(ret)));
1510 return ret;
1511 }
1512
1513 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1514 ret = (krb5_error_code) krberror.error_code;
1515 got_error_code = True;
1516 }
1517
1518 smb_krb5_free_error(context, &krberror);
1519 }
1520 #else /* MIT */
1521 {
1522 krb5_error *krberror;
1523
1524 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1525 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1526 error_message(ret)));
1527 return ret;
1528 }
1529
1530 if (krberror->e_data.data == NULL) {
1531 ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1532 got_error_code = True;
1533 }
1534 smb_krb5_free_error(context, krberror);
1535 }
1536 #endif
1537 if (got_error_code) {
1538 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1539 error_message(ret), ret));
1540 }
1541 return ret;
1542 }
1543
1544 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1545 krb5_get_init_creds_opt **opt)
1546 {
1547 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1548 /* Heimdal or modern MIT version */
1549 return krb5_get_init_creds_opt_alloc(context, opt);
1550 #else
1551 /* Historical MIT version */
1552 krb5_get_init_creds_opt *my_opt;
1553
1554 *opt = NULL;
1555
1556 if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1557 return ENOMEM;
1558 }
1559
1560 krb5_get_init_creds_opt_init(my_opt);
1561
1562 *opt = my_opt;
1563 return 0;
1564 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC */
1565 }
1566
1567 void smb_krb5_get_init_creds_opt_free(krb5_context context,
1568 krb5_get_init_creds_opt *opt)
1569 {
1570 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1571
1572 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1573 /* Modern MIT or Heimdal version */
1574 krb5_get_init_creds_opt_free(context, opt);
1575 #else
1576 /* Heimdal version */
1577 krb5_get_init_creds_opt_free(opt);
1578 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1579
1580 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1581 /* Historical MIT version */
1582 SAFE_FREE(opt);
1583 opt = NULL;
1584 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1585 }
1586
1587 krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1588 {
1589 return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1590 }
1591
1592
1593 /* caller needs to free etype_s */
1594 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1595 krb5_enctype enctype,
1596 char **etype_s)
1597 {
1598 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1599 return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1600 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1601 char buf[256];
1602 krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1603 if (ret) {
1604 return ret;
1605 }
1606 *etype_s = SMB_STRDUP(buf);
1607 if (!*etype_s) {
1608 return ENOMEM;
1609 }
1610 return ret;
1611 #else
1612 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1613 #endif
1614 }
1615
1616 krb5_error_code smb_krb5_mk_error(krb5_context context,
1617 krb5_error_code error_code,
1618 const krb5_principal server,
1619 krb5_data *reply)
1620 {
1621 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1622 /*
1623 * The MIT interface is *terrible*.
1624 * We have to construct this ourselves...
1625 */
1626 krb5_error e;
1627
1628 memset(&e, 0, sizeof(e));
1629 krb5_us_timeofday(context, &e.stime, &e.susec);
1630 e.server = server;
1631 #if defined(krb5_err_base)
1632 e.error = error_code - krb5_err_base;
1633 #elif defined(ERROR_TABLE_BASE_krb5)
1634 e.error = error_code - ERROR_TABLE_BASE_krb5;
1635 #else
1636 e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1637 #endif
1638
1639 return krb5_mk_error(context, &e, reply);
1640 #else /* Heimdal. */
1641 return krb5_mk_error(context,
1642 error_code,
1643 NULL,
1644 NULL, /* e_data */
1645 NULL,
1646 server,
1647 NULL,
1648 NULL,
1649 reply);
1650 #endif
1651 }
1652
1653 /**********************************************************************
1654 * Open a krb5 keytab with flags, handles readonly or readwrite access and
1655 * allows to process non-default keytab names.
1656 * @param context krb5_context
1657 * @param keytab_name_req string
1658 * @param write_access bool if writable keytab is required
1659 * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1660 * @return krb5_error_code
1661 **********************************************************************/
1662
1663 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1664 #ifndef MAX_KEYTAB_NAME_LEN
1665 #define MAX_KEYTAB_NAME_LEN 1100
1666 #endif
1667
1668 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1669 const char *keytab_name_req,
1670 bool write_access,
1671 krb5_keytab *keytab)
1672 {
1673 krb5_error_code ret = 0;
1674 TALLOC_CTX *mem_ctx;
1675 char keytab_string[MAX_KEYTAB_NAME_LEN];
1676 char *kt_str = NULL;
1677 bool found_valid_name = False;
1678 const char *pragma = "FILE";
1679 const char *tmp = NULL;
1680
1681 if (!write_access && !keytab_name_req) {
1682 /* caller just wants to read the default keytab readonly, so be it */
1683 return krb5_kt_default(context, keytab);
1684 }
1685
1686 mem_ctx = talloc_init("smb_krb5_open_keytab");
1687 if (!mem_ctx) {
1688 return ENOMEM;
1689 }
1690
1691 #ifdef HAVE_WRFILE_KEYTAB
1692 if (write_access) {
1693 pragma = "WRFILE";
1694 }
1695 #endif
1696
1697 if (keytab_name_req) {
1698
1699 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1700 ret = KRB5_CONFIG_NOTENUFSPACE;
1701 goto out;
1702 }
1703
1704 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1705 (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1706 tmp = keytab_name_req;
1707 goto resolve;
1708 }
1709
1710 if (keytab_name_req[0] != '/') {
1711 ret = KRB5_KT_BADNAME;
1712 goto out;
1713 }
1714
1715 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1716 if (!tmp) {
1717 ret = ENOMEM;
1718 goto out;
1719 }
1720
1721 goto resolve;
1722 }
1723
1724 /* we need to handle more complex keytab_strings, like:
1725 * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1726
1727 ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1728 if (ret) {
1729 goto out;
1730 }
1731
1732 DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1733
1734 tmp = talloc_strdup(mem_ctx, keytab_string);
1735 if (!tmp) {
1736 ret = ENOMEM;
1737 goto out;
1738 }
1739
1740 if (strncmp(tmp, "ANY:", 4) == 0) {
1741 tmp += 4;
1742 }
1743
1744 memset(&keytab_string, '\0', sizeof(keytab_string));
1745
1746 while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1747 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1748 found_valid_name = True;
1749 tmp = kt_str;
1750 tmp += 7;
1751 }
1752
1753 if (strncmp(kt_str, "FILE:", 5) == 0) {
1754 found_valid_name = True;
1755 tmp = kt_str;
1756 tmp += 5;
1757 }
1758
1759 if (found_valid_name) {
1760 if (tmp[0] != '/') {
1761 ret = KRB5_KT_BADNAME;
1762 goto out;
1763 }
1764
1765 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1766 if (!tmp) {
1767 ret = ENOMEM;
1768 goto out;
1769 }
1770 break;
1771 }
1772 }
1773
1774 if (!found_valid_name) {
1775 ret = KRB5_KT_UNKNOWN_TYPE;
1776 goto out;
1777 }
1778
1779 resolve:
1780 DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1781 ret = krb5_kt_resolve(context, tmp, keytab);
1782
1783 out:
1784 TALLOC_FREE(mem_ctx);
1785 return ret;
1786 }
1787
1788 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1789 krb5_context context,
1790 krb5_keytab keytab,
1791 const char **keytab_name)
1792 {
1793 char keytab_string[MAX_KEYTAB_NAME_LEN];
1794 krb5_error_code ret = 0;
1795
1796 ret = krb5_kt_get_name(context, keytab,
1797 keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1798 if (ret) {
1799 return ret;
1800 }
1801
1802 *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1803 if (!*keytab_name) {
1804 return ENOMEM;
1805 }
1806
1807 return ret;
1808 }
1809
1810 #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)
1811 /**************************************************************
1812 Routine: ads_krb5_get_fwd_ticket
1813 Description:
1814 When a service ticket is flagged as trusted
1815 for delegation we should provide a forwardable
1816 ticket so that the remote host can act on our
1817 behalf. This is done by taking the 2nd forwardable
1818 TGT and storing it in the GSS-API authenticator
1819 "checksum". This routine will populate
1820 the krb5_data authenticator with this TGT.
1821 Parameters:
1822 krb5_context context: The kerberos context for this authentication.
1823 krb5_auth_context: The authentication context.
1824 krb5_creds *credsp: The ticket credentials (AS-REP).
1825 krb5_ccache ccache: The credentials cache.
1826 krb5_data &authenticator: The checksum field that will store the TGT, and
1827 authenticator.data must be freed by the caller.
1828
1829 Returns:
1830 krb5_error_code: 0 if no errors, otherwise set.
1831 **************************************************************/
1832
1833 static krb5_error_code ads_krb5_get_fwd_ticket( krb5_context context,
1834 krb5_auth_context *auth_context,
1835 krb5_creds *credsp,
1836 krb5_ccache ccache,
1837 krb5_data *authenticator)
1838 {
1839 krb5_data fwdData;
1840 krb5_error_code retval = 0;
1841 char *pChksum = NULL;
1842 char *p = NULL;
1843
1844 ZERO_STRUCT(fwdData);
1845 ZERO_STRUCTP(authenticator);
1846
1847 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
1848 *auth_context, /* Authentication context [in] */
1849 CONST_DISCARD(char *, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
1850 credsp->client, /* Client principal for the tgt [in] */
1851 credsp->server, /* Server principal for the tgt [in] */
1852 ccache, /* Credential cache to use for storage [in] */
1853 1, /* Turn on for "Forwardable ticket" [in] */
1854 &fwdData ); /* Resulting response [out] */
1855
1856
1857 if (retval) {
1858 DEBUG(1,("ads_krb5_get_fwd_ticket: krb5_fwd_tgt_creds failed (%s)\n",
1859 error_message(retval)));
1860 goto out;
1861 }
1862
1863 if ((unsigned int)GSSAPI_CHECKSUM_SIZE + (unsigned int)fwdData.length <
1864 (unsigned int)GSSAPI_CHECKSUM_SIZE) {
1865 retval = EINVAL;
1866 goto out;
1867 }
1868
1869 /* We're going to allocate a gssChecksum structure with a little
1870 extra data the length of the kerberos credentials length
1871 (APPLICATION 22) so that we can pack it on the end of the structure.
1872 */
1873
1874 pChksum = (char *)SMB_MALLOC(GSSAPI_CHECKSUM_SIZE + fwdData.length );
1875 if (!pChksum) {
1876 retval = ENOMEM;
1877 goto out;
1878 }
1879
1880 p = pChksum;
1881
1882 SIVAL(p, 0, GSSAPI_BNDLENGTH);
1883 p += 4;
1884
1885 /* Zero out the bindings fields */
1886 memset(p, '\0', GSSAPI_BNDLENGTH );
1887 p += GSSAPI_BNDLENGTH;
1888
1889 SIVAL(p, 0, GSS_C_DELEG_FLAG );
1890 p += 4;
1891 SSVAL(p, 0, 1 );
1892 p += 2;
1893 SSVAL(p, 0, fwdData.length );
1894 p += 2;
1895
1896 /* Migrate the kerberos KRB_CRED data to the checksum delegation */
1897 memcpy(p, fwdData.data, fwdData.length );
1898 p += fwdData.length;
1899
1900 /* We need to do this in order to allow our GSS-API */
1901 retval = krb5_auth_con_set_req_cksumtype( context, *auth_context, GSSAPI_CHECKSUM );
1902 if (retval) {
1903 goto out;
1904 }
1905
1906 /* We now have a service ticket, now turn it into an AP-REQ. */
1907 authenticator->length = fwdData.length + GSSAPI_CHECKSUM_SIZE;
1908
1909 /* Caller should call free() when they're done with this. */
1910 authenticator->data = (char *)pChksum;
1911
1912 out:
1913
1914 /* Remove that input data, we never needed it anyway. */
1915 if (fwdData.length > 0) {
1916 krb5_free_data_contents( context, &fwdData );
1917 }
1918
1919 return retval;
1920 }
1921 #endif
1922
1923 #else /* HAVE_KRB5 */
1924 /* this saves a few linking headaches */
1925 int cli_krb5_get_ticket(const char *principal, time_t time_offset,
1926 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, uint32 extra_ap_opts,
1927 const char *ccname, time_t *tgs_expire)
1928 {
1929 DEBUG(0,("NO KERBEROS SUPPORT\n"));
1930 return 1;
1931 }
1932
1933 #endif
Proof-of-concept samba4 based caching proxy