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s3:libsmb: use 16 zero bytes as channel binding checksum in the gssapi checksum ...
[Samba.git] / source3 / libsmb / clikrb5.c
blob7b5cd094337bee3a27192f7396814f52f64d612e
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 2005-2009
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 #include "includes.h"
24 #include "smb_krb5.h"
25 #include "authdata.h"
26
27 #ifdef HAVE_KRB5
28
29 #define GSSAPI_CHECKSUM 0x8003 /* Checksum type value for Kerberos */
30 #define GSSAPI_BNDLENGTH 16 /* Bind Length (rfc-1964 pg.3) */
31 #define GSSAPI_CHECKSUM_SIZE (4+GSSAPI_BNDLENGTH+4) /* Length of bind length,
32 bind field, flags field. */
33
34 /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
35 but still has the symbol */
36 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
37 krb5_error_code krb5_auth_con_set_req_cksumtype(
38 krb5_context context,
39 krb5_auth_context auth_context,
40 krb5_cksumtype cksumtype);
41 #endif
42
43 /**************************************************************
44 Wrappers around kerberos string functions that convert from
45 utf8 -> unix charset and vica versa.
46 **************************************************************/
47
48 /**************************************************************
49 krb5_parse_name that takes a UNIX charset.
50 **************************************************************/
51
52 krb5_error_code smb_krb5_parse_name(krb5_context context,
53 const char *name, /* in unix charset */
54 krb5_principal *principal)
55 {
56 krb5_error_code ret;
57 char *utf8_name;
58 size_t converted_size;
59
60 if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
61 return ENOMEM;
62 }
63
64 ret = krb5_parse_name(context, utf8_name, principal);
65 TALLOC_FREE(utf8_name);
66 return ret;
67 }
68
69 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
70 /**************************************************************
71 krb5_parse_name_norealm that takes a UNIX charset.
72 **************************************************************/
73
74 static krb5_error_code smb_krb5_parse_name_norealm_conv(krb5_context context,
75 const char *name, /* in unix charset */
76 krb5_principal *principal)
77 {
78 krb5_error_code ret;
79 char *utf8_name;
80 size_t converted_size;
81
82 *principal = NULL;
83 if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
84 return ENOMEM;
85 }
86
87 ret = krb5_parse_name_norealm(context, utf8_name, principal);
88 TALLOC_FREE(utf8_name);
89 return ret;
90 }
91 #endif
92
93 /**************************************************************
94 krb5_parse_name that returns a UNIX charset name. Must
95 be freed with talloc_free() call.
96 **************************************************************/
97
98 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
99 krb5_context context,
100 krb5_const_principal principal,
101 char **unix_name)
102 {
103 krb5_error_code ret;
104 char *utf8_name;
105 size_t converted_size;
106
107 *unix_name = NULL;
108 ret = krb5_unparse_name(context, principal, &utf8_name);
109 if (ret) {
110 return ret;
111 }
112
113 if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
114 krb5_free_unparsed_name(context, utf8_name);
115 return ENOMEM;
116 }
117 krb5_free_unparsed_name(context, utf8_name);
118 return 0;
119 }
120
121 #ifndef HAVE_KRB5_SET_REAL_TIME
122 /*
123 * This function is not in the Heimdal mainline.
124 */
125 krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds)
126 {
127 krb5_error_code ret;
128 int32_t sec, usec;
129
130 ret = krb5_us_timeofday(context, &sec, &usec);
131 if (ret)
132 return ret;
133
134 context->kdc_sec_offset = seconds - sec;
135 context->kdc_usec_offset = microseconds - usec;
136
137 return 0;
138 }
139 #endif
140
141 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
142
143 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
144
145 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
146 * to krb5_set_default_tgs_ktypes. See
147 * http://lists.samba.org/archive/samba-technical/2006-July/048271.html
148 *
149 * If the MIT libraries are not exporting internal symbols, we will end up in
150 * this branch, which is correct. Otherwise we will continue to use the
151 * internal symbol
152 */
153 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
154 {
155 return krb5_set_default_tgs_enctypes(ctx, enc);
156 }
157
158 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
159
160 /* Heimdal */
161 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
162 {
163 return krb5_set_default_in_tkt_etypes(ctx, enc);
164 }
165
166 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
167
168 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
169
170 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
171 /* HEIMDAL */
172 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
173 {
174 memset(pkaddr, '\0', sizeof(krb5_address));
175 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
176 if (paddr->ss_family == AF_INET6) {
177 pkaddr->addr_type = KRB5_ADDRESS_INET6;
178 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
179 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
180 return true;
181 }
182 #endif
183 if (paddr->ss_family == AF_INET) {
184 pkaddr->addr_type = KRB5_ADDRESS_INET;
185 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
186 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
187 return true;
188 }
189 return false;
190 }
191 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
192 /* MIT */
193 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
194 {
195 memset(pkaddr, '\0', sizeof(krb5_address));
196 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
197 if (paddr->ss_family == AF_INET6) {
198 pkaddr->addrtype = ADDRTYPE_INET6;
199 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
200 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
201 return true;
202 }
203 #endif
204 if (paddr->ss_family == AF_INET) {
205 pkaddr->addrtype = ADDRTYPE_INET;
206 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
207 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
208 return true;
209 }
210 return false;
211 }
212 #else
213 #error UNKNOWN_ADDRTYPE
214 #endif
215
216 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY) && defined(HAVE_KRB5_ENCRYPT_BLOCK)
217 static int create_kerberos_key_from_string_direct(krb5_context context,
218 krb5_principal host_princ,
219 krb5_data *password,
220 krb5_keyblock *key,
221 krb5_enctype enctype)
222 {
223 int ret = 0;
224 krb5_data salt;
225 krb5_encrypt_block eblock;
226
227 ret = krb5_principal2salt(context, host_princ, &salt);
228 if (ret) {
229 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
230 return ret;
231 }
232 krb5_use_enctype(context, &eblock, enctype);
233 ret = krb5_string_to_key(context, &eblock, key, password, &salt);
234 SAFE_FREE(salt.data);
235
236 return ret;
237 }
238 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
239 static int create_kerberos_key_from_string_direct(krb5_context context,
240 krb5_principal host_princ,
241 krb5_data *password,
242 krb5_keyblock *key,
243 krb5_enctype enctype)
244 {
245 int ret;
246 krb5_salt salt;
247
248 ret = krb5_get_pw_salt(context, host_princ, &salt);
249 if (ret) {
250 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
251 return ret;
252 }
253
254 ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
255 krb5_free_salt(context, salt);
256
257 return ret;
258 }
259 #else
260 #error UNKNOWN_CREATE_KEY_FUNCTIONS
261 #endif
262
263 int create_kerberos_key_from_string(krb5_context context,
264 krb5_principal host_princ,
265 krb5_data *password,
266 krb5_keyblock *key,
267 krb5_enctype enctype,
268 bool no_salt)
269 {
270 krb5_principal salt_princ = NULL;
271 int ret;
272 /*
273 * Check if we've determined that the KDC is salting keys for this
274 * principal/enctype in a non-obvious way. If it is, try to match
275 * its behavior.
276 */
277 if (no_salt) {
278 KRB5_KEY_DATA(key) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
279 if (!KRB5_KEY_DATA(key)) {
280 return ENOMEM;
281 }
282 memcpy(KRB5_KEY_DATA(key), password->data, password->length);
283 KRB5_KEY_LENGTH(key) = password->length;
284 KRB5_KEY_TYPE(key) = enctype;
285 return 0;
286 }
287 salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype);
288 ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype);
289 if (salt_princ) {
290 krb5_free_principal(context, salt_princ);
291 }
292 return ret;
293 }
294
295 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
296 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
297 krb5_enctype **enctypes)
298 {
299 return krb5_get_permitted_enctypes(context, enctypes);
300 }
301 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
302 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
303 krb5_enctype **enctypes)
304 {
305 return krb5_get_default_in_tkt_etypes(context, enctypes);
306 }
307 #else
308 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
309 #endif
310
311 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
312 krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
313 krb5_auth_context auth_context,
314 krb5_keyblock *keyblock)
315 {
316 return krb5_auth_con_setkey(context, auth_context, keyblock);
317 }
318 #endif
319
320 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
321 DATA_BLOB *edata,
322 DATA_BLOB *edata_out)
323 {
324 DATA_BLOB edata_contents;
325 ASN1_DATA *data;
326 int edata_type;
327
328 if (!edata->length) {
329 return False;
330 }
331
332 data = asn1_init(mem_ctx);
333 if (data == NULL) {
334 return false;
335 }
336
337 asn1_load(data, *edata);
338 asn1_start_tag(data, ASN1_SEQUENCE(0));
339 asn1_start_tag(data, ASN1_CONTEXT(1));
340 asn1_read_Integer(data, &edata_type);
341
342 if (edata_type != KRB5_PADATA_PW_SALT) {
343 DEBUG(0,("edata is not of required type %d but of type %d\n",
344 KRB5_PADATA_PW_SALT, edata_type));
345 asn1_free(data);
346 return False;
347 }
348
349 asn1_start_tag(data, ASN1_CONTEXT(2));
350 asn1_read_OctetString(data, talloc_autofree_context(), &edata_contents);
351 asn1_end_tag(data);
352 asn1_end_tag(data);
353 asn1_end_tag(data);
354 asn1_free(data);
355
356 *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
357
358 data_blob_free(&edata_contents);
359
360 return True;
361 }
362
363
364 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
365 {
366 DATA_BLOB pac_contents;
367 ASN1_DATA *data;
368 int data_type;
369
370 if (!auth_data->length) {
371 return False;
372 }
373
374 data = asn1_init(mem_ctx);
375 if (data == NULL) {
376 return false;
377 }
378
379 asn1_load(data, *auth_data);
380 asn1_start_tag(data, ASN1_SEQUENCE(0));
381 asn1_start_tag(data, ASN1_SEQUENCE(0));
382 asn1_start_tag(data, ASN1_CONTEXT(0));
383 asn1_read_Integer(data, &data_type);
384
385 if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) {
386 DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type));
387 asn1_free(data);
388 return False;
389 }
390
391 asn1_end_tag(data);
392 asn1_start_tag(data, ASN1_CONTEXT(1));
393 asn1_read_OctetString(data, talloc_autofree_context(), &pac_contents);
394 asn1_end_tag(data);
395 asn1_end_tag(data);
396 asn1_end_tag(data);
397 asn1_free(data);
398
399 *unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length);
400
401 data_blob_free(&pac_contents);
402
403 return True;
404 }
405
406 bool get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt)
407 {
408 DATA_BLOB auth_data_wrapped;
409 bool got_auth_data_pac = False;
410 int i;
411
412 #if defined(HAVE_KRB5_TKT_ENC_PART2)
413 if (tkt->enc_part2 && tkt->enc_part2->authorization_data &&
414 tkt->enc_part2->authorization_data[0] &&
415 tkt->enc_part2->authorization_data[0]->length)
416 {
417 for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) {
418
419 if (tkt->enc_part2->authorization_data[i]->ad_type !=
420 KRB5_AUTHDATA_IF_RELEVANT) {
421 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
422 tkt->enc_part2->authorization_data[i]->ad_type));
423 continue;
424 }
425
426 auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents,
427 tkt->enc_part2->authorization_data[i]->length);
428
429 /* check if it is a PAC */
430 got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
431 data_blob_free(&auth_data_wrapped);
432
433 if (got_auth_data_pac) {
434 return true;
435 }
436 }
437
438 return got_auth_data_pac;
439 }
440
441 #else
442 if (tkt->ticket.authorization_data &&
443 tkt->ticket.authorization_data->len)
444 {
445 for (i = 0; i < tkt->ticket.authorization_data->len; i++) {
446
447 if (tkt->ticket.authorization_data->val[i].ad_type !=
448 KRB5_AUTHDATA_IF_RELEVANT) {
449 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
450 tkt->ticket.authorization_data->val[i].ad_type));
451 continue;
452 }
453
454 auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data,
455 tkt->ticket.authorization_data->val[i].ad_data.length);
456
457 /* check if it is a PAC */
458 got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
459 data_blob_free(&auth_data_wrapped);
460
461 if (got_auth_data_pac) {
462 return true;
463 }
464 }
465
466 return got_auth_data_pac;
467 }
468 #endif
469 return False;
470 }
471
472 krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
473 {
474 #if defined(HAVE_KRB5_TKT_ENC_PART2)
475 return tkt->enc_part2->client;
476 #else
477 return tkt->client;
478 #endif
479 }
480
481 #if !defined(HAVE_KRB5_LOCATE_KDC)
482
483 /* krb5_locate_kdc is an internal MIT symbol. MIT are not yet willing to commit
484 * to a public interface for this functionality, so we have to be able to live
485 * without it if the MIT libraries are hiding their internal symbols.
486 */
487
488 #if defined(KRB5_KRBHST_INIT)
489 /* Heimdal */
490 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters)
491 {
492 krb5_krbhst_handle hnd;
493 krb5_krbhst_info *hinfo;
494 krb5_error_code rc;
495 int num_kdcs, i;
496 struct sockaddr *sa;
497 struct addrinfo *ai;
498
499 *addr_pp = NULL;
500 *naddrs = 0;
501
502 rc = krb5_krbhst_init(ctx, realm->data, KRB5_KRBHST_KDC, &hnd);
503 if (rc) {
504 DEBUG(0, ("smb_krb5_locate_kdc: krb5_krbhst_init failed (%s)\n", error_message(rc)));
505 return rc;
506 }
507
508 for ( num_kdcs = 0; (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); num_kdcs++)
509 ;
510
511 krb5_krbhst_reset(ctx, hnd);
512
513 if (!num_kdcs) {
514 DEBUG(0, ("smb_krb5_locate_kdc: zero kdcs found !\n"));
515 krb5_krbhst_free(ctx, hnd);
516 return -1;
517 }
518
519 sa = SMB_MALLOC_ARRAY( struct sockaddr, num_kdcs );
520 if (!sa) {
521 DEBUG(0, ("smb_krb5_locate_kdc: malloc failed\n"));
522 krb5_krbhst_free(ctx, hnd);
523 naddrs = 0;
524 return -1;
525 }
526
527 memset(sa, '\0', sizeof(struct sockaddr) * num_kdcs );
528
529 for (i = 0; i < num_kdcs && (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); i++) {
530
531 #if defined(HAVE_KRB5_KRBHST_GET_ADDRINFO)
532 rc = krb5_krbhst_get_addrinfo(ctx, hinfo, &ai);
533 if (rc) {
534 DEBUG(0,("krb5_krbhst_get_addrinfo failed: %s\n", error_message(rc)));
535 continue;
536 }
537 #endif
538 if (hinfo->ai && hinfo->ai->ai_family == AF_INET)
539 memcpy(&sa[i], hinfo->ai->ai_addr, sizeof(struct sockaddr));
540 }
541
542 krb5_krbhst_free(ctx, hnd);
543
544 *naddrs = num_kdcs;
545 *addr_pp = sa;
546 return 0;
547 }
548
549 #else /* ! defined(KRB5_KRBHST_INIT) */
550
551 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
552 struct sockaddr **addr_pp, int *naddrs, int get_masters)
553 {
554 DEBUG(0, ("unable to explicitly locate the KDC on this platform\n"));
555 return KRB5_KDC_UNREACH;
556 }
557
558 #endif /* KRB5_KRBHST_INIT */
559
560 #else /* ! HAVE_KRB5_LOCATE_KDC */
561
562 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
563 struct sockaddr **addr_pp, int *naddrs, int get_masters)
564 {
565 return krb5_locate_kdc(ctx, realm, addr_pp, naddrs, get_masters);
566 }
567
568 #endif /* HAVE_KRB5_LOCATE_KDC */
569
570 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
571 void krb5_free_unparsed_name(krb5_context context, char *val)
572 {
573 SAFE_FREE(val);
574 }
575 #endif
576
577 void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
578 {
579 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
580 if (pdata->data) {
581 krb5_free_data_contents(context, pdata);
582 }
583 #else
584 SAFE_FREE(pdata->data);
585 #endif
586 }
587
588 void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype)
589 {
590 #if defined(HAVE_KRB5_KEYBLOCK_IN_CREDS)
591 KRB5_KEY_TYPE((&pcreds->keyblock)) = enctype;
592 #elif defined(HAVE_KRB5_SESSION_IN_CREDS)
593 KRB5_KEY_TYPE((&pcreds->session)) = enctype;
594 #else
595 #error UNKNOWN_KEYBLOCK_MEMBER_IN_KRB5_CREDS_STRUCT
596 #endif
597 }
598
599 bool kerberos_compatible_enctypes(krb5_context context,
600 krb5_enctype enctype1,
601 krb5_enctype enctype2)
602 {
603 #if defined(HAVE_KRB5_C_ENCTYPE_COMPARE)
604 krb5_boolean similar = 0;
605
606 krb5_c_enctype_compare(context, enctype1, enctype2, &similar);
607 return similar ? True : False;
608 #elif defined(HAVE_KRB5_ENCTYPES_COMPATIBLE_KEYS)
609 return krb5_enctypes_compatible_keys(context, enctype1, enctype2) ? True : False;
610 #endif
611 }
612
613 static bool ads_cleanup_expired_creds(krb5_context context,
614 krb5_ccache ccache,
615 krb5_creds *credsp)
616 {
617 krb5_error_code retval;
618 const char *cc_type = krb5_cc_get_type(context, ccache);
619
620 DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
621 cc_type, krb5_cc_get_name(context, ccache),
622 http_timestring(talloc_tos(), credsp->times.endtime)));
623
624 /* we will probably need new tickets if the current ones
625 will expire within 10 seconds.
626 */
627 if (credsp->times.endtime >= (time(NULL) + 10))
628 return False;
629
630 /* heimdal won't remove creds from a file ccache, and
631 perhaps we shouldn't anyway, since internally we
632 use memory ccaches, and a FILE one probably means that
633 we're using creds obtained outside of our exectuable
634 */
635 if (strequal(cc_type, "FILE")) {
636 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
637 return False;
638 }
639
640 retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
641 if (retval) {
642 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
643 error_message(retval)));
644 /* If we have an error in this, we want to display it,
645 but continue as though we deleted it */
646 }
647 return True;
648 }
649
650 /* Allocate and setup the auth context into the state we need. */
651
652 static krb5_error_code setup_auth_context(krb5_context context,
653 krb5_auth_context *auth_context)
654 {
655 krb5_error_code retval;
656
657 retval = krb5_auth_con_init(context, auth_context );
658 if (retval) {
659 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
660 error_message(retval)));
661 return retval;
662 }
663
664 /* Ensure this is an addressless ticket. */
665 retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
666 if (retval) {
667 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
668 error_message(retval)));
669 }
670
671 return retval;
672 }
673
674 static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
675 uint32_t gss_flags)
676 {
677 unsigned int orig_length = in_data->length;
678 unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
679 char *gss_cksum = NULL;
680
681 if (orig_length) {
682 /* Extra length field for delgated ticket. */
683 base_cksum_size += 4;
684 }
685
686 if ((unsigned int)base_cksum_size + orig_length <
687 (unsigned int)base_cksum_size) {
688 return EINVAL;
689 }
690
691 gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
692 if (gss_cksum == NULL) {
693 return ENOMEM;
694 }
695
696 memset(gss_cksum, '\0', base_cksum_size + orig_length);
697 SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
698
699 /*
700 * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
701 * This matches the behavior of heimdal and mit.
702 *
703 * And it is needed to work against some closed source
704 * SMB servers.
705 *
706 * See bug #7883
707 */
708 memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
709
710 SIVAL(gss_cksum, 20, gss_flags);
711
712 if (orig_length) {
713 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
714 SSVAL(gss_cksum, 26, orig_length);
715 /* Copy the kerberos KRB_CRED data */
716 memcpy(gss_cksum + 28, in_data->data, orig_length);
717 free(in_data->data);
718 in_data->data = NULL;
719 in_data->length = 0;
720 }
721 in_data->data = gss_cksum;
722 in_data->length = base_cksum_size + orig_length;
723 return 0;
724 }
725
726 /*
727 we can't use krb5_mk_req because w2k wants the service to be in a particular format
728 */
729 static krb5_error_code ads_krb5_mk_req(krb5_context context,
730 krb5_auth_context *auth_context,
731 const krb5_flags ap_req_options,
732 const char *principal,
733 krb5_ccache ccache,
734 krb5_data *outbuf,
735 time_t *expire_time,
736 const char *impersonate_princ_s)
737 {
738 krb5_error_code retval;
739 krb5_principal server;
740 krb5_principal impersonate_princ = NULL;
741 krb5_creds * credsp;
742 krb5_creds creds;
743 krb5_data in_data;
744 bool creds_ready = False;
745 int i = 0, maxtries = 3;
746 uint32_t gss_flags = 0;
747
748 ZERO_STRUCT(in_data);
749
750 retval = smb_krb5_parse_name(context, principal, &server);
751 if (retval) {
752 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
753 return retval;
754 }
755
756 if (impersonate_princ_s) {
757 retval = smb_krb5_parse_name(context, impersonate_princ_s,
758 &impersonate_princ);
759 if (retval) {
760 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
761 goto cleanup_princ;
762 }
763 }
764
765 /* obtain ticket & session key */
766 ZERO_STRUCT(creds);
767 if ((retval = krb5_copy_principal(context, server, &creds.server))) {
768 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
769 error_message(retval)));
770 goto cleanup_princ;
771 }
772
773 if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
774 /* This can commonly fail on smbd startup with no ticket in the cache.
775 * Report at higher level than 1. */
776 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
777 error_message(retval)));
778 goto cleanup_creds;
779 }
780
781 while (!creds_ready && (i < maxtries)) {
782
783 if ((retval = smb_krb5_get_credentials(context, ccache,
784 creds.client,
785 creds.server,
786 impersonate_princ,
787 &credsp))) {
788 DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
789 principal, error_message(retval)));
790 goto cleanup_creds;
791 }
792
793 /* cope with ticket being in the future due to clock skew */
794 if ((unsigned)credsp->times.starttime > time(NULL)) {
795 time_t t = time(NULL);
796 int time_offset =(int)((unsigned)credsp->times.starttime-t);
797 DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
798 krb5_set_real_time(context, t + time_offset + 1, 0);
799 }
800
801 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
802 creds_ready = True;
803 }
804
805 i++;
806 }
807
808 DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
809 principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
810 http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
811 (unsigned)credsp->times.endtime));
812
813 if (expire_time) {
814 *expire_time = (time_t)credsp->times.endtime;
815 }
816
817 /* Allocate the auth_context. */
818 retval = setup_auth_context(context, auth_context);
819 if (retval) {
820 DEBUG(1,("setup_auth_context failed (%s)\n",
821 error_message(retval)));
822 goto cleanup_creds;
823 }
824
825 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_FWD_TGT_CREDS) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
826 if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
827 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
828 as part of the kerberos exchange. */
829
830 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n") );
831
832 retval = krb5_auth_con_setuseruserkey(context,
833 *auth_context,
834 &credsp->keyblock );
835 if (retval) {
836 DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
837 error_message(retval)));
838 goto cleanup_creds;
839 }
840
841 /* Must use a subkey for forwarded tickets. */
842 retval = krb5_auth_con_setflags(context,
843 *auth_context,
844 KRB5_AUTH_CONTEXT_USE_SUBKEY);
845 if (retval) {
846 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
847 error_message(retval)));
848 goto cleanup_creds;
849 }
850
851 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
852 *auth_context, /* Authentication context [in] */
853 CONST_DISCARD(char *, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
854 credsp->client, /* Client principal for the tgt [in] */
855 credsp->server, /* Server principal for the tgt [in] */
856 ccache, /* Credential cache to use for storage [in] */
857 1, /* Turn on for "Forwardable ticket" [in] */
858 &in_data ); /* Resulting response [out] */
859
860 if (retval) {
861 DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
862 error_message( retval ) ) );
863
864 /*
865 * This is not fatal. Delete the *auth_context and continue
866 * with krb5_mk_req_extended to get a non-forwardable ticket.
867 */
868
869 if (in_data.data) {
870 free( in_data.data );
871 in_data.data = NULL;
872 in_data.length = 0;
873 }
874 krb5_auth_con_free(context, *auth_context);
875 *auth_context = NULL;
876 retval = setup_auth_context(context, auth_context);
877 if (retval) {
878 DEBUG(1,("setup_auth_context failed (%s)\n",
879 error_message(retval)));
880 goto cleanup_creds;
881 }
882 } else {
883 /* We got a delegated ticket. */
884 gss_flags |= GSS_C_DELEG_FLAG;
885 }
886 }
887
888 /* Frees and reallocates in_data into a GSS checksum blob. */
889 retval = create_gss_checksum(&in_data, gss_flags);
890 if (retval) {
891 goto cleanup_data;
892 }
893
894 /* We always want GSS-checksum types. */
895 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
896 if (retval) {
897 DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
898 error_message(retval)));
899 goto cleanup_data;
900 }
901 #endif
902
903 retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
904 &in_data, credsp, outbuf);
905 if (retval) {
906 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
907 error_message(retval)));
908 }
909
910 cleanup_data:
911 if (in_data.data) {
912 free( in_data.data );
913 in_data.length = 0;
914 }
915
916 krb5_free_creds(context, credsp);
917
918 cleanup_creds:
919 krb5_free_cred_contents(context, &creds);
920
921 cleanup_princ:
922 krb5_free_principal(context, server);
923 if (impersonate_princ) {
924 krb5_free_principal(context, impersonate_princ);
925 }
926
927 return retval;
928 }
929
930 /*
931 get a kerberos5 ticket for the given service
932 */
933 int cli_krb5_get_ticket(const char *principal, time_t time_offset,
934 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
935 uint32 extra_ap_opts, const char *ccname,
936 time_t *tgs_expire,
937 const char *impersonate_princ_s)
938
939 {
940 krb5_error_code retval;
941 krb5_data packet;
942 krb5_context context = NULL;
943 krb5_ccache ccdef = NULL;
944 krb5_auth_context auth_context = NULL;
945 krb5_enctype enc_types[] = {
946 #ifdef ENCTYPE_ARCFOUR_HMAC
947 ENCTYPE_ARCFOUR_HMAC,
948 #endif
949 ENCTYPE_DES_CBC_MD5,
950 ENCTYPE_DES_CBC_CRC,
951 ENCTYPE_NULL};
952
953 initialize_krb5_error_table();
954 retval = krb5_init_context(&context);
955 if (retval) {
956 DEBUG(1,("cli_krb5_get_ticket: krb5_init_context failed (%s)\n",
957 error_message(retval)));
958 goto failed;
959 }
960
961 if (time_offset != 0) {
962 krb5_set_real_time(context, time(NULL) + time_offset, 0);
963 }
964
965 if ((retval = krb5_cc_resolve(context, ccname ?
966 ccname : krb5_cc_default_name(context), &ccdef))) {
967 DEBUG(1,("cli_krb5_get_ticket: krb5_cc_default failed (%s)\n",
968 error_message(retval)));
969 goto failed;
970 }
971
972 if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
973 DEBUG(1,("cli_krb5_get_ticket: krb5_set_default_tgs_ktypes failed (%s)\n",
974 error_message(retval)));
975 goto failed;
976 }
977
978 if ((retval = ads_krb5_mk_req(context,
979 &auth_context,
980 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
981 principal,
982 ccdef, &packet,
983 tgs_expire,
984 impersonate_princ_s))) {
985 goto failed;
986 }
987
988 get_krb5_smb_session_key(context, auth_context, session_key_krb5, False);
989
990 *ticket = data_blob(packet.data, packet.length);
991
992 kerberos_free_data_contents(context, &packet);
993
994 failed:
995
996 if ( context ) {
997 if (ccdef)
998 krb5_cc_close(context, ccdef);
999 if (auth_context)
1000 krb5_auth_con_free(context, auth_context);
1001 krb5_free_context(context);
1002 }
1003
1004 return retval;
1005 }
1006
1007 bool get_krb5_smb_session_key(krb5_context context, krb5_auth_context auth_context, DATA_BLOB *session_key, bool remote)
1008 {
1009 krb5_keyblock *skey = NULL;
1010 krb5_error_code err = 0;
1011 bool ret = false;
1012
1013 if (remote) {
1014 err = krb5_auth_con_getremotesubkey(context, auth_context, &skey);
1015 } else {
1016 err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey);
1017 }
1018
1019 if (err || skey == NULL) {
1020 DEBUG(10, ("KRB5 error getting session key %d\n", err));
1021 goto done;
1022 }
1023
1024 DEBUG(10, ("Got KRB5 session key of length %d\n", (int)KRB5_KEY_LENGTH(skey)));
1025 *session_key = data_blob(KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
1026 dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
1027
1028 ret = true;
1029
1030 done:
1031 if (skey) {
1032 krb5_free_keyblock(context, skey);
1033 }
1034
1035 return ret;
1036 }
1037
1038
1039 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
1040 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
1041
1042 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
1043 {
1044 static krb5_data kdata;
1045
1046 kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
1047 kdata.length = strlen((const char *)kdata.data);
1048 return &kdata;
1049 }
1050 #endif
1051
1052 krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
1053 {
1054 /* Try krb5_free_keytab_entry_contents first, since
1055 * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
1056 * krb5_kt_free_entry but only has a prototype for the first, while the
1057 * second is considered private.
1058 */
1059 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
1060 return krb5_free_keytab_entry_contents(context, kt_entry);
1061 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
1062 return krb5_kt_free_entry(context, kt_entry);
1063 #else
1064 #error UNKNOWN_KT_FREE_FUNCTION
1065 #endif
1066 }
1067
1068 void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
1069 struct PAC_SIGNATURE_DATA *sig)
1070 {
1071 #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
1072 cksum->cksumtype = (krb5_cksumtype)sig->type;
1073 cksum->checksum.length = sig->signature.length;
1074 cksum->checksum.data = sig->signature.data;
1075 #else
1076 cksum->checksum_type = (krb5_cksumtype)sig->type;
1077 cksum->length = sig->signature.length;
1078 cksum->contents = sig->signature.data;
1079 #endif
1080 }
1081
1082 krb5_error_code smb_krb5_verify_checksum(krb5_context context,
1083 const krb5_keyblock *keyblock,
1084 krb5_keyusage usage,
1085 krb5_checksum *cksum,
1086 uint8 *data,
1087 size_t length)
1088 {
1089 krb5_error_code ret;
1090
1091 /* verify the checksum */
1092
1093 /* welcome to the wonderful world of samba's kerberos abstraction layer:
1094 *
1095 * function heimdal 0.6.1rc3 heimdal 0.7 MIT krb 1.4.2
1096 * -----------------------------------------------------------------------------
1097 * krb5_c_verify_checksum - works works
1098 * krb5_verify_checksum works (6 args) works (6 args) broken (7 args)
1099 */
1100
1101 #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
1102 {
1103 krb5_boolean checksum_valid = False;
1104 krb5_data input;
1105
1106 input.data = (char *)data;
1107 input.length = length;
1108
1109 ret = krb5_c_verify_checksum(context,
1110 keyblock,
1111 usage,
1112 &input,
1113 cksum,
1114 &checksum_valid);
1115 if (ret) {
1116 DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
1117 error_message(ret)));
1118 return ret;
1119 }
1120
1121 if (!checksum_valid)
1122 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1123 }
1124
1125 #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
1126
1127 /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
1128 * without enctype and it ignores any key_usage types - Guenther */
1129
1130 {
1131
1132 krb5_crypto crypto;
1133 ret = krb5_crypto_init(context,
1134 keyblock,
1135 0,
1136 &crypto);
1137 if (ret) {
1138 DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
1139 error_message(ret)));
1140 return ret;
1141 }
1142
1143 ret = krb5_verify_checksum(context,
1144 crypto,
1145 usage,
1146 data,
1147 length,
1148 cksum);
1149
1150 krb5_crypto_destroy(context, crypto);
1151 }
1152
1153 #else
1154 #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
1155 #endif
1156
1157 return ret;
1158 }
1159
1160 time_t get_authtime_from_tkt(krb5_ticket *tkt)
1161 {
1162 #if defined(HAVE_KRB5_TKT_ENC_PART2)
1163 return tkt->enc_part2->times.authtime;
1164 #else
1165 return tkt->ticket.authtime;
1166 #endif
1167 }
1168
1169 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1170 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
1171 {
1172 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
1173 if (ap_req->ticket->enc_part.kvno)
1174 return ap_req->ticket->enc_part.kvno;
1175 #else /* Heimdal */
1176 if (ap_req->ticket.enc_part.kvno)
1177 return *ap_req->ticket.enc_part.kvno;
1178 #endif
1179 return 0;
1180 }
1181
1182 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
1183 {
1184 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
1185 return ap_req->ticket.enc_part.etype;
1186 #else /* MIT */
1187 return ap_req->ticket->enc_part.enctype;
1188 #endif
1189 }
1190 #endif /* HAVE_KRB5_DECODE_AP_REQ */
1191
1192 static krb5_error_code
1193 get_key_from_keytab(krb5_context context,
1194 krb5_const_principal server,
1195 krb5_enctype enctype,
1196 krb5_kvno kvno,
1197 krb5_keyblock **out_key)
1198 {
1199 krb5_keytab_entry entry;
1200 krb5_error_code ret;
1201 krb5_keytab keytab;
1202 char *name = NULL;
1203 krb5_keyblock *keyp;
1204
1205 /* We have to open a new keytab handle here, as MIT does
1206 an implicit open/getnext/close on krb5_kt_get_entry. We
1207 may be in the middle of a keytab enumeration when this is
1208 called. JRA. */
1209
1210 ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1211 if (ret) {
1212 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1213 return ret;
1214 }
1215
1216 if ( DEBUGLEVEL >= 10 ) {
1217 if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) {
1218 DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1219 kvno, enctype, name));
1220 TALLOC_FREE(name);
1221 }
1222 }
1223
1224 ret = krb5_kt_get_entry(context,
1225 keytab,
1226 server,
1227 kvno,
1228 enctype,
1229 &entry);
1230
1231 if (ret) {
1232 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1233 goto out;
1234 }
1235
1236 keyp = KRB5_KT_KEY(&entry);
1237
1238 ret = krb5_copy_keyblock(context, keyp, out_key);
1239 if (ret) {
1240 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1241 goto out;
1242 }
1243
1244 smb_krb5_kt_free_entry(context, &entry);
1245
1246 out:
1247 krb5_kt_close(context, keytab);
1248 return ret;
1249 }
1250
1251 /* Prototypes */
1252
1253 krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1254 const krb5_data *inbuf,
1255 krb5_kvno *kvno,
1256 krb5_enctype *enctype)
1257 {
1258 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1259 {
1260 krb5_error_code ret;
1261 krb5_ap_req ap_req;
1262
1263 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1264 if (ret)
1265 return ret;
1266
1267 *kvno = get_kvno_from_ap_req(&ap_req);
1268 *enctype = get_enctype_from_ap_req(&ap_req);
1269
1270 free_AP_REQ(&ap_req);
1271 return 0;
1272 }
1273 #endif
1274
1275 /* Possibly not an appropriate error code. */
1276 return KRB5KDC_ERR_BADOPTION;
1277 }
1278
1279 krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1280 krb5_auth_context *auth_context,
1281 const krb5_data *inbuf,
1282 krb5_const_principal server,
1283 krb5_keytab keytab,
1284 krb5_flags *ap_req_options,
1285 krb5_ticket **ticket,
1286 krb5_keyblock **keyblock)
1287 {
1288 krb5_error_code ret;
1289 krb5_kvno kvno;
1290 krb5_enctype enctype;
1291 krb5_keyblock *local_keyblock;
1292
1293 ret = krb5_rd_req(context,
1294 auth_context,
1295 inbuf,
1296 server,
1297 keytab,
1298 ap_req_options,
1299 ticket);
1300 if (ret) {
1301 return ret;
1302 }
1303
1304 #ifdef KRB5_TICKET_HAS_KEYINFO
1305 enctype = (*ticket)->enc_part.enctype;
1306 kvno = (*ticket)->enc_part.kvno;
1307 #else
1308 ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1309 if (ret) {
1310 return ret;
1311 }
1312 #endif
1313
1314 ret = get_key_from_keytab(context,
1315 server,
1316 enctype,
1317 kvno,
1318 &local_keyblock);
1319 if (ret) {
1320 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1321 goto out;
1322 }
1323
1324 out:
1325 if (ret && local_keyblock != NULL) {
1326 krb5_free_keyblock(context, local_keyblock);
1327 } else {
1328 *keyblock = local_keyblock;
1329 }
1330
1331 return ret;
1332 }
1333
1334 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1335 const char *name,
1336 krb5_principal *principal)
1337 {
1338 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1339 return smb_krb5_parse_name_norealm_conv(context, name, principal);
1340 #endif
1341
1342 /* we are cheating here because parse_name will in fact set the realm.
1343 * We don't care as the only caller of smb_krb5_parse_name_norealm
1344 * ignores the realm anyway when calling
1345 * smb_krb5_principal_compare_any_realm later - Guenther */
1346
1347 return smb_krb5_parse_name(context, name, principal);
1348 }
1349
1350 bool smb_krb5_principal_compare_any_realm(krb5_context context,
1351 krb5_const_principal princ1,
1352 krb5_const_principal princ2)
1353 {
1354 #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1355
1356 return krb5_principal_compare_any_realm(context, princ1, princ2);
1357
1358 /* krb5_princ_size is a macro in MIT */
1359 #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1360
1361 int i, len1, len2;
1362 const krb5_data *p1, *p2;
1363
1364 len1 = krb5_princ_size(context, princ1);
1365 len2 = krb5_princ_size(context, princ2);
1366
1367 if (len1 != len2)
1368 return False;
1369
1370 for (i = 0; i < len1; i++) {
1371
1372 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1373 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1374
1375 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1376 return False;
1377 }
1378
1379 return True;
1380 #else
1381 #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1382 #endif
1383 }
1384
1385 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, /* FILE:/tmp/krb5cc_0 */
1386 const char *client_string, /* gd@BER.SUSE.DE */
1387 const char *service_string, /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1388 time_t *expire_time)
1389 {
1390 krb5_error_code ret;
1391 krb5_context context = NULL;
1392 krb5_ccache ccache = NULL;
1393 krb5_principal client = NULL;
1394 krb5_creds creds, creds_in, *creds_out = NULL;
1395
1396 ZERO_STRUCT(creds);
1397 ZERO_STRUCT(creds_in);
1398
1399 initialize_krb5_error_table();
1400 ret = krb5_init_context(&context);
1401 if (ret) {
1402 goto done;
1403 }
1404
1405 if (!ccache_string) {
1406 ccache_string = krb5_cc_default_name(context);
1407 }
1408
1409 if (!ccache_string) {
1410 ret = EINVAL;
1411 goto done;
1412 }
1413
1414 DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1415
1416 /* FIXME: we should not fall back to defaults */
1417 ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1418 if (ret) {
1419 goto done;
1420 }
1421
1422 if (client_string) {
1423 ret = smb_krb5_parse_name(context, client_string, &client);
1424 if (ret) {
1425 goto done;
1426 }
1427 } else {
1428 ret = krb5_cc_get_principal(context, ccache, &client);
1429 if (ret) {
1430 goto done;
1431 }
1432 }
1433
1434 #ifdef HAVE_KRB5_GET_RENEWED_CREDS /* MIT */
1435 {
1436 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1437 if (ret) {
1438 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1439 goto done;
1440 }
1441 }
1442 #elif defined(HAVE_KRB5_GET_KDC_CRED) /* Heimdal */
1443 {
1444 krb5_kdc_flags flags;
1445 krb5_realm *client_realm = NULL;
1446
1447 ret = krb5_copy_principal(context, client, &creds_in.client);
1448 if (ret) {
1449 goto done;
1450 }
1451
1452 if (service_string) {
1453 ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1454 if (ret) {
1455 goto done;
1456 }
1457 } else {
1458 /* build tgt service by default */
1459 client_realm = krb5_princ_realm(context, creds_in.client);
1460 if (!client_realm) {
1461 ret = ENOMEM;
1462 goto done;
1463 }
1464 ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1465 if (ret) {
1466 goto done;
1467 }
1468 }
1469
1470 flags.i = 0;
1471 flags.b.renewable = flags.b.renew = True;
1472
1473 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1474 if (ret) {
1475 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1476 goto done;
1477 }
1478
1479 creds = *creds_out;
1480 }
1481 #else
1482 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1483 #endif
1484
1485 /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1486 ret = krb5_cc_initialize(context, ccache, client);
1487 if (ret) {
1488 goto done;
1489 }
1490
1491 ret = krb5_cc_store_cred(context, ccache, &creds);
1492
1493 if (expire_time) {
1494 *expire_time = (time_t) creds.times.endtime;
1495 }
1496
1497 done:
1498 krb5_free_cred_contents(context, &creds_in);
1499
1500 if (creds_out) {
1501 krb5_free_creds(context, creds_out);
1502 } else {
1503 krb5_free_cred_contents(context, &creds);
1504 }
1505
1506 if (client) {
1507 krb5_free_principal(context, client);
1508 }
1509 if (ccache) {
1510 krb5_cc_close(context, ccache);
1511 }
1512 if (context) {
1513 krb5_free_context(context);
1514 }
1515
1516 return ret;
1517 }
1518
1519 krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1520 {
1521 krb5_error_code ret = 0;
1522 if (addr == NULL) {
1523 return ret;
1524 }
1525 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1526 krb5_free_addresses(context, addr->addrs);
1527 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1528 ret = krb5_free_addresses(context, addr->addrs);
1529 SAFE_FREE(addr->addrs);
1530 #endif
1531 SAFE_FREE(addr);
1532 addr = NULL;
1533 return ret;
1534 }
1535
1536 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1537 {
1538 krb5_error_code ret = 0;
1539 nstring buf;
1540 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1541 krb5_address **addrs = NULL;
1542 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1543 krb5_addresses *addrs = NULL;
1544 #endif
1545
1546 *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1547 if (*kerb_addr == NULL) {
1548 return ENOMEM;
1549 }
1550
1551 put_name(buf, global_myname(), ' ', 0x20);
1552
1553 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1554 {
1555 int num_addr = 2;
1556
1557 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1558 if (addrs == NULL) {
1559 SAFE_FREE(*kerb_addr);
1560 return ENOMEM;
1561 }
1562
1563 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1564
1565 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1566 if (addrs[0] == NULL) {
1567 SAFE_FREE(addrs);
1568 SAFE_FREE(*kerb_addr);
1569 return ENOMEM;
1570 }
1571
1572 addrs[0]->magic = KV5M_ADDRESS;
1573 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1574 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1575 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1576 if (addrs[0]->contents == NULL) {
1577 SAFE_FREE(addrs[0]);
1578 SAFE_FREE(addrs);
1579 SAFE_FREE(*kerb_addr);
1580 return ENOMEM;
1581 }
1582
1583 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1584
1585 addrs[1] = NULL;
1586 }
1587 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1588 {
1589 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1590 if (addrs == NULL) {
1591 SAFE_FREE(*kerb_addr);
1592 return ENOMEM;
1593 }
1594
1595 memset(addrs, 0, sizeof(krb5_addresses));
1596
1597 addrs->len = 1;
1598 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1599 if (addrs->val == NULL) {
1600 SAFE_FREE(addrs);
1601 SAFE_FREE(kerb_addr);
1602 return ENOMEM;
1603 }
1604
1605 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1606 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1607 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1608 if (addrs->val[0].address.data == NULL) {
1609 SAFE_FREE(addrs->val);
1610 SAFE_FREE(addrs);
1611 SAFE_FREE(*kerb_addr);
1612 return ENOMEM;
1613 }
1614
1615 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1616 }
1617 #else
1618 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1619 #endif
1620 (*kerb_addr)->addrs = addrs;
1621
1622 return ret;
1623 }
1624
1625 void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1626 {
1627 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1628 krb5_free_error_contents(context, krberror);
1629 #else /* MIT */
1630 krb5_free_error(context, krberror);
1631 #endif
1632 }
1633
1634 krb5_error_code handle_krberror_packet(krb5_context context,
1635 krb5_data *packet)
1636 {
1637 krb5_error_code ret;
1638 bool got_error_code = False;
1639
1640 DEBUG(10,("handle_krberror_packet: got error packet\n"));
1641
1642 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1643 {
1644 krb5_error krberror;
1645
1646 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1647 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1648 error_message(ret)));
1649 return ret;
1650 }
1651
1652 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1653 ret = (krb5_error_code) krberror.error_code;
1654 got_error_code = True;
1655 }
1656
1657 smb_krb5_free_error(context, &krberror);
1658 }
1659 #else /* MIT */
1660 {
1661 krb5_error *krberror;
1662
1663 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1664 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1665 error_message(ret)));
1666 return ret;
1667 }
1668
1669 if (krberror->e_data.data == NULL) {
1670 #if defined(ERROR_TABLE_BASE_krb5)
1671 ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1672 #else
1673 ret = (krb5_error_code)krberror->error;
1674 #endif
1675 got_error_code = True;
1676 }
1677 smb_krb5_free_error(context, krberror);
1678 }
1679 #endif
1680 if (got_error_code) {
1681 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1682 error_message(ret), ret));
1683 }
1684 return ret;
1685 }
1686
1687 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1688 krb5_get_init_creds_opt **opt)
1689 {
1690 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1691 /* Heimdal or modern MIT version */
1692 return krb5_get_init_creds_opt_alloc(context, opt);
1693 #else
1694 /* Historical MIT version */
1695 krb5_get_init_creds_opt *my_opt;
1696
1697 *opt = NULL;
1698
1699 if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1700 return ENOMEM;
1701 }
1702
1703 krb5_get_init_creds_opt_init(my_opt);
1704
1705 *opt = my_opt;
1706 return 0;
1707 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC */
1708 }
1709
1710 void smb_krb5_get_init_creds_opt_free(krb5_context context,
1711 krb5_get_init_creds_opt *opt)
1712 {
1713 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1714
1715 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1716 /* Modern MIT or Heimdal version */
1717 krb5_get_init_creds_opt_free(context, opt);
1718 #else
1719 /* Heimdal version */
1720 krb5_get_init_creds_opt_free(opt);
1721 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1722
1723 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1724 /* Historical MIT version */
1725 SAFE_FREE(opt);
1726 opt = NULL;
1727 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1728 }
1729
1730 krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1731 {
1732 return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1733 }
1734
1735
1736 /* caller needs to free etype_s */
1737 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1738 krb5_enctype enctype,
1739 char **etype_s)
1740 {
1741 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1742 return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1743 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1744 char buf[256];
1745 krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1746 if (ret) {
1747 return ret;
1748 }
1749 *etype_s = SMB_STRDUP(buf);
1750 if (!*etype_s) {
1751 return ENOMEM;
1752 }
1753 return ret;
1754 #else
1755 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1756 #endif
1757 }
1758
1759 krb5_error_code smb_krb5_mk_error(krb5_context context,
1760 krb5_error_code error_code,
1761 const krb5_principal server,
1762 krb5_data *reply)
1763 {
1764 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1765 /*
1766 * The MIT interface is *terrible*.
1767 * We have to construct this ourselves...
1768 */
1769 krb5_error e;
1770
1771 memset(&e, 0, sizeof(e));
1772 krb5_us_timeofday(context, &e.stime, &e.susec);
1773 e.server = server;
1774 #if defined(krb5_err_base)
1775 e.error = error_code - krb5_err_base;
1776 #elif defined(ERROR_TABLE_BASE_krb5)
1777 e.error = error_code - ERROR_TABLE_BASE_krb5;
1778 #else
1779 e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1780 #endif
1781
1782 return krb5_mk_error(context, &e, reply);
1783 #else /* Heimdal. */
1784 return krb5_mk_error(context,
1785 error_code,
1786 NULL,
1787 NULL, /* e_data */
1788 NULL,
1789 server,
1790 NULL,
1791 NULL,
1792 reply);
1793 #endif
1794 }
1795
1796 /**********************************************************************
1797 * Open a krb5 keytab with flags, handles readonly or readwrite access and
1798 * allows to process non-default keytab names.
1799 * @param context krb5_context
1800 * @param keytab_name_req string
1801 * @param write_access bool if writable keytab is required
1802 * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1803 * @return krb5_error_code
1804 **********************************************************************/
1805
1806 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1807 #ifndef MAX_KEYTAB_NAME_LEN
1808 #define MAX_KEYTAB_NAME_LEN 1100
1809 #endif
1810
1811 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1812 const char *keytab_name_req,
1813 bool write_access,
1814 krb5_keytab *keytab)
1815 {
1816 krb5_error_code ret = 0;
1817 TALLOC_CTX *mem_ctx;
1818 char keytab_string[MAX_KEYTAB_NAME_LEN];
1819 char *kt_str = NULL;
1820 bool found_valid_name = False;
1821 const char *pragma = "FILE";
1822 const char *tmp = NULL;
1823
1824 if (!write_access && !keytab_name_req) {
1825 /* caller just wants to read the default keytab readonly, so be it */
1826 return krb5_kt_default(context, keytab);
1827 }
1828
1829 mem_ctx = talloc_init("smb_krb5_open_keytab");
1830 if (!mem_ctx) {
1831 return ENOMEM;
1832 }
1833
1834 #ifdef HAVE_WRFILE_KEYTAB
1835 if (write_access) {
1836 pragma = "WRFILE";
1837 }
1838 #endif
1839
1840 if (keytab_name_req) {
1841
1842 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1843 ret = KRB5_CONFIG_NOTENUFSPACE;
1844 goto out;
1845 }
1846
1847 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1848 (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1849 tmp = keytab_name_req;
1850 goto resolve;
1851 }
1852
1853 if (keytab_name_req[0] != '/') {
1854 ret = KRB5_KT_BADNAME;
1855 goto out;
1856 }
1857
1858 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1859 if (!tmp) {
1860 ret = ENOMEM;
1861 goto out;
1862 }
1863
1864 goto resolve;
1865 }
1866
1867 /* we need to handle more complex keytab_strings, like:
1868 * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1869
1870 ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1871 if (ret) {
1872 goto out;
1873 }
1874
1875 DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1876
1877 tmp = talloc_strdup(mem_ctx, keytab_string);
1878 if (!tmp) {
1879 ret = ENOMEM;
1880 goto out;
1881 }
1882
1883 if (strncmp(tmp, "ANY:", 4) == 0) {
1884 tmp += 4;
1885 }
1886
1887 memset(&keytab_string, '\0', sizeof(keytab_string));
1888
1889 while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1890 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1891 found_valid_name = True;
1892 tmp = kt_str;
1893 tmp += 7;
1894 }
1895
1896 if (strncmp(kt_str, "FILE:", 5) == 0) {
1897 found_valid_name = True;
1898 tmp = kt_str;
1899 tmp += 5;
1900 }
1901
1902 if (tmp[0] == '/') {
1903 /* Treat as a FILE: keytab definition. */
1904 found_valid_name = true;
1905 }
1906
1907 if (found_valid_name) {
1908 if (tmp[0] != '/') {
1909 ret = KRB5_KT_BADNAME;
1910 goto out;
1911 }
1912
1913 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1914 if (!tmp) {
1915 ret = ENOMEM;
1916 goto out;
1917 }
1918 break;
1919 }
1920 }
1921
1922 if (!found_valid_name) {
1923 ret = KRB5_KT_UNKNOWN_TYPE;
1924 goto out;
1925 }
1926
1927 resolve:
1928 DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1929 ret = krb5_kt_resolve(context, tmp, keytab);
1930
1931 out:
1932 TALLOC_FREE(mem_ctx);
1933 return ret;
1934 }
1935
1936 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1937 krb5_context context,
1938 krb5_keytab keytab,
1939 const char **keytab_name)
1940 {
1941 char keytab_string[MAX_KEYTAB_NAME_LEN];
1942 krb5_error_code ret = 0;
1943
1944 ret = krb5_kt_get_name(context, keytab,
1945 keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1946 if (ret) {
1947 return ret;
1948 }
1949
1950 *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1951 if (!*keytab_name) {
1952 return ENOMEM;
1953 }
1954
1955 return ret;
1956 }
1957
1958 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1959 defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1960 defined(HAVE_KRB5_GET_CREDS)
1961 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1962 krb5_ccache ccache,
1963 krb5_principal me,
1964 krb5_principal server,
1965 krb5_principal impersonate_princ,
1966 krb5_creds **out_creds)
1967 {
1968 krb5_error_code ret;
1969 krb5_get_creds_opt opt;
1970
1971 ret = krb5_get_creds_opt_alloc(context, &opt);
1972 if (ret) {
1973 goto done;
1974 }
1975 krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1976
1977 if (impersonate_princ) {
1978 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1979 impersonate_princ);
1980 if (ret) {
1981 goto done;
1982 }
1983 }
1984
1985 ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1986 if (ret) {
1987 goto done;
1988 }
1989
1990 done:
1991 if (opt) {
1992 krb5_get_creds_opt_free(context, opt);
1993 }
1994 return ret;
1995 }
1996 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1997
1998 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1999 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
2000 krb5_ccache ccache,
2001 krb5_principal me,
2002 krb5_principal server,
2003 krb5_principal impersonate_princ,
2004 krb5_creds **out_creds)
2005 {
2006 krb5_error_code ret;
2007 krb5_creds in_creds;
2008
2009 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
2010 krb5_error_code KRB5_CALLCONV
2011 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
2012 krb5_ccache ccache, krb5_creds *in_creds,
2013 krb5_data *subject_cert,
2014 krb5_creds **out_creds);
2015 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
2016
2017 ZERO_STRUCT(in_creds);
2018
2019 if (impersonate_princ) {
2020
2021 in_creds.server = me;
2022 in_creds.client = impersonate_princ;
2023
2024 ret = krb5_get_credentials_for_user(context,
2025 0, /* krb5_flags options */
2026 ccache,
2027 &in_creds,
2028 NULL, /* krb5_data *subject_cert */
2029 out_creds);
2030 } else {
2031 in_creds.client = me;
2032 in_creds.server = server;
2033
2034 ret = krb5_get_credentials(context, 0, ccache,
2035 &in_creds, out_creds);
2036 }
2037
2038 return ret;
2039 }
2040 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
2041
2042 /*
2043 * smb_krb5_get_credentials
2044 *
2045 * @brief Get krb5 credentials for a server
2046 *
2047 * @param[in] context An initialized krb5_context
2048 * @param[in] ccache An initialized krb5_ccache
2049 * @param[in] me The krb5_principal of the caller
2050 * @param[in] server The krb5_principal of the requested service
2051 * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
2052 * @param[out] out_creds The returned krb5_creds structure
2053 * @return krb5_error_code
2054 *
2055 */
2056 krb5_error_code smb_krb5_get_credentials(krb5_context context,
2057 krb5_ccache ccache,
2058 krb5_principal me,
2059 krb5_principal server,
2060 krb5_principal impersonate_princ,
2061 krb5_creds **out_creds)
2062 {
2063 krb5_error_code ret;
2064 krb5_creds *creds = NULL;
2065
2066 *out_creds = NULL;
2067
2068 if (impersonate_princ) {
2069 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
2070 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
2071 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
2072 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
2073 #else
2074 ret = ENOTSUP;
2075 #endif
2076 } else {
2077 krb5_creds in_creds;
2078
2079 ZERO_STRUCT(in_creds);
2080
2081 in_creds.client = me;
2082 in_creds.server = server;
2083
2084 ret = krb5_get_credentials(context, 0, ccache,
2085 &in_creds, &creds);
2086 }
2087 if (ret) {
2088 goto done;
2089 }
2090
2091 ret = krb5_cc_store_cred(context, ccache, creds);
2092 if (ret) {
2093 goto done;
2094 }
2095
2096 if (out_creds) {
2097 *out_creds = creds;
2098 }
2099
2100 done:
2101 if (creds && ret) {
2102 krb5_free_creds(context, creds);
2103 }
2104
2105 return ret;
2106 }
2107
2108 /*
2109 * smb_krb5_get_creds
2110 *
2111 * @brief Get krb5 credentials for a server
2112 *
2113 * @param[in] server_s The string name of the service
2114 * @param[in] time_offset The offset to the KDCs time in seconds (optional)
2115 * @param[in] cc The krb5 credential cache string name (optional)
2116 * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
2117 * @param[out] creds_p The returned krb5_creds structure
2118 * @return krb5_error_code
2119 *
2120 */
2121 krb5_error_code smb_krb5_get_creds(const char *server_s,
2122 time_t time_offset,
2123 const char *cc,
2124 const char *impersonate_princ_s,
2125 krb5_creds **creds_p)
2126 {
2127 krb5_error_code ret;
2128 krb5_context context = NULL;
2129 krb5_principal me = NULL;
2130 krb5_principal server = NULL;
2131 krb5_principal impersonate_princ = NULL;
2132 krb5_creds *creds = NULL;
2133 krb5_ccache ccache = NULL;
2134
2135 *creds_p = NULL;
2136
2137 initialize_krb5_error_table();
2138 ret = krb5_init_context(&context);
2139 if (ret) {
2140 goto done;
2141 }
2142
2143 if (time_offset != 0) {
2144 krb5_set_real_time(context, time(NULL) + time_offset, 0);
2145 }
2146
2147 ret = krb5_cc_resolve(context, cc ? cc :
2148 krb5_cc_default_name(context), &ccache);
2149 if (ret) {
2150 goto done;
2151 }
2152
2153 ret = krb5_cc_get_principal(context, ccache, &me);
2154 if (ret) {
2155 goto done;
2156 }
2157
2158 ret = smb_krb5_parse_name(context, server_s, &server);
2159 if (ret) {
2160 goto done;
2161 }
2162
2163 if (impersonate_princ_s) {
2164 ret = smb_krb5_parse_name(context, impersonate_princ_s,
2165 &impersonate_princ);
2166 if (ret) {
2167 goto done;
2168 }
2169 }
2170
2171 ret = smb_krb5_get_credentials(context, ccache,
2172 me, server, impersonate_princ,
2173 &creds);
2174 if (ret) {
2175 goto done;
2176 }
2177
2178 ret = krb5_cc_store_cred(context, ccache, creds);
2179 if (ret) {
2180 goto done;
2181 }
2182
2183 if (creds_p) {
2184 *creds_p = creds;
2185 }
2186
2187 DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
2188 server_s));
2189
2190 if (impersonate_princ_s) {
2191 char *client = NULL;
2192
2193 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
2194 if (ret) {
2195 goto done;
2196 }
2197 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
2198 client));
2199 TALLOC_FREE(client);
2200 }
2201
2202 done:
2203 if (!context) {
2204 return ret;
2205 }
2206
2207 if (creds && ret) {
2208 krb5_free_creds(context, creds);
2209 }
2210 if (server) {
2211 krb5_free_principal(context, server);
2212 }
2213 if (me) {
2214 krb5_free_principal(context, me);
2215 }
2216 if (impersonate_princ) {
2217 krb5_free_principal(context, impersonate_princ);
2218 }
2219 if (ccache) {
2220 krb5_cc_close(context, ccache);
2221 }
2222 krb5_free_context(context);
2223
2224 return ret;
2225 }
2226
2227 /*
2228 * smb_krb5_principal_get_realm
2229 *
2230 * @brief Get realm of a principal
2231 *
2232 * @param[in] context The krb5_context
2233 * @param[in] principal The principal
2234 * @return pointer to the realm
2235 *
2236 */
2237
2238 char *smb_krb5_principal_get_realm(krb5_context context,
2239 krb5_principal principal)
2240 {
2241 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2242 return krb5_principal_get_realm(context, principal);
2243 #elif defined(krb5_princ_realm) /* MIT */
2244 krb5_data *realm;
2245 realm = krb5_princ_realm(context, principal);
2246 return (char *)realm->data;
2247 #else
2248 return NULL;
2249 #endif
2250 }
2251
2252 #else /* HAVE_KRB5 */
2253 /* this saves a few linking headaches */
2254 int cli_krb5_get_ticket(const char *principal, time_t time_offset,
2255 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, uint32 extra_ap_opts,
2256 const char *ccname, time_t *tgs_expire,
2257 const char *impersonate_princ_s)
2258 {
2259 DEBUG(0,("NO KERBEROS SUPPORT\n"));
2260 return 1;
2261 }
2262
2263 #endif
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