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s3:libsmb: add tstream_is_cli_np()
[Samba/gebeck_regimport.git] / source3 / libsmb / clikrb5.c
blob5d51a5b19c85d0966ccfa0f7b55a540a74db86ac
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 "../librpc/gen_ndr/krb5pac.h"
26
27 #ifndef KRB5_AUTHDATA_WIN2K_PAC
28 #define KRB5_AUTHDATA_WIN2K_PAC 128
29 #endif
30
31 #ifndef KRB5_AUTHDATA_IF_RELEVANT
32 #define KRB5_AUTHDATA_IF_RELEVANT 1
33 #endif
34
35 #ifdef HAVE_KRB5
36
37 #define GSSAPI_CHECKSUM 0x8003 /* Checksum type value for Kerberos */
38 #define GSSAPI_BNDLENGTH 16 /* Bind Length (rfc-1964 pg.3) */
39 #define GSSAPI_CHECKSUM_SIZE (4+GSSAPI_BNDLENGTH+4) /* Length of bind length,
40 bind field, flags field. */
41
42 /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
43 but still has the symbol */
44 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
45 krb5_error_code krb5_auth_con_set_req_cksumtype(
46 krb5_context context,
47 krb5_auth_context auth_context,
48 krb5_cksumtype cksumtype);
49 #endif
50
51 /**************************************************************
52 Wrappers around kerberos string functions that convert from
53 utf8 -> unix charset and vica versa.
54 **************************************************************/
55
56 /**************************************************************
57 krb5_parse_name that takes a UNIX charset.
58 **************************************************************/
59
60 krb5_error_code smb_krb5_parse_name(krb5_context context,
61 const char *name, /* in unix charset */
62 krb5_principal *principal)
63 {
64 krb5_error_code ret;
65 char *utf8_name;
66 size_t converted_size;
67
68 if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
69 return ENOMEM;
70 }
71
72 ret = krb5_parse_name(context, utf8_name, principal);
73 TALLOC_FREE(utf8_name);
74 return ret;
75 }
76
77 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
78 /**************************************************************
79 krb5_parse_name_norealm that takes a UNIX charset.
80 **************************************************************/
81
82 static krb5_error_code smb_krb5_parse_name_norealm_conv(krb5_context context,
83 const char *name, /* in unix charset */
84 krb5_principal *principal)
85 {
86 krb5_error_code ret;
87 char *utf8_name;
88 size_t converted_size;
89
90 *principal = NULL;
91 if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
92 return ENOMEM;
93 }
94
95 ret = krb5_parse_name_norealm(context, utf8_name, principal);
96 TALLOC_FREE(utf8_name);
97 return ret;
98 }
99 #endif
100
101 /**************************************************************
102 krb5_parse_name that returns a UNIX charset name. Must
103 be freed with talloc_free() call.
104 **************************************************************/
105
106 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
107 krb5_context context,
108 krb5_const_principal principal,
109 char **unix_name)
110 {
111 krb5_error_code ret;
112 char *utf8_name;
113 size_t converted_size;
114
115 *unix_name = NULL;
116 ret = krb5_unparse_name(context, principal, &utf8_name);
117 if (ret) {
118 return ret;
119 }
120
121 if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
122 krb5_free_unparsed_name(context, utf8_name);
123 return ENOMEM;
124 }
125 krb5_free_unparsed_name(context, utf8_name);
126 return 0;
127 }
128
129 #ifndef HAVE_KRB5_SET_REAL_TIME
130 /*
131 * This function is not in the Heimdal mainline.
132 */
133 krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds)
134 {
135 krb5_error_code ret;
136 int32_t sec, usec;
137
138 ret = krb5_us_timeofday(context, &sec, &usec);
139 if (ret)
140 return ret;
141
142 context->kdc_sec_offset = seconds - sec;
143 context->kdc_usec_offset = microseconds - usec;
144
145 return 0;
146 }
147 #endif
148
149 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
150
151 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
152
153 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
154 * to krb5_set_default_tgs_ktypes. See
155 * http://lists.samba.org/archive/samba-technical/2006-July/048271.html
156 *
157 * If the MIT libraries are not exporting internal symbols, we will end up in
158 * this branch, which is correct. Otherwise we will continue to use the
159 * internal symbol
160 */
161 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
162 {
163 return krb5_set_default_tgs_enctypes(ctx, enc);
164 }
165
166 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
167
168 /* Heimdal */
169 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
170 {
171 return krb5_set_default_in_tkt_etypes(ctx, enc);
172 }
173
174 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
175
176 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
177
178 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
179 /* HEIMDAL */
180 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
181 {
182 memset(pkaddr, '\0', sizeof(krb5_address));
183 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
184 if (paddr->ss_family == AF_INET6) {
185 pkaddr->addr_type = KRB5_ADDRESS_INET6;
186 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
187 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
188 return true;
189 }
190 #endif
191 if (paddr->ss_family == AF_INET) {
192 pkaddr->addr_type = KRB5_ADDRESS_INET;
193 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
194 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
195 return true;
196 }
197 return false;
198 }
199 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
200 /* MIT */
201 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
202 {
203 memset(pkaddr, '\0', sizeof(krb5_address));
204 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
205 if (paddr->ss_family == AF_INET6) {
206 pkaddr->addrtype = ADDRTYPE_INET6;
207 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
208 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
209 return true;
210 }
211 #endif
212 if (paddr->ss_family == AF_INET) {
213 pkaddr->addrtype = ADDRTYPE_INET;
214 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
215 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
216 return true;
217 }
218 return false;
219 }
220 #else
221 #error UNKNOWN_ADDRTYPE
222 #endif
223
224 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY) && defined(HAVE_KRB5_ENCRYPT_BLOCK)
225 static int create_kerberos_key_from_string_direct(krb5_context context,
226 krb5_principal host_princ,
227 krb5_data *password,
228 krb5_keyblock *key,
229 krb5_enctype enctype)
230 {
231 int ret = 0;
232 krb5_data salt;
233 krb5_encrypt_block eblock;
234
235 ret = krb5_principal2salt(context, host_princ, &salt);
236 if (ret) {
237 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
238 return ret;
239 }
240 krb5_use_enctype(context, &eblock, enctype);
241 ret = krb5_string_to_key(context, &eblock, key, password, &salt);
242 SAFE_FREE(salt.data);
243
244 return ret;
245 }
246 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
247 static int create_kerberos_key_from_string_direct(krb5_context context,
248 krb5_principal host_princ,
249 krb5_data *password,
250 krb5_keyblock *key,
251 krb5_enctype enctype)
252 {
253 int ret;
254 krb5_salt salt;
255
256 ret = krb5_get_pw_salt(context, host_princ, &salt);
257 if (ret) {
258 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
259 return ret;
260 }
261
262 ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
263 krb5_free_salt(context, salt);
264
265 return ret;
266 }
267 #else
268 #error UNKNOWN_CREATE_KEY_FUNCTIONS
269 #endif
270
271 int create_kerberos_key_from_string(krb5_context context,
272 krb5_principal host_princ,
273 krb5_data *password,
274 krb5_keyblock *key,
275 krb5_enctype enctype,
276 bool no_salt)
277 {
278 krb5_principal salt_princ = NULL;
279 int ret;
280 /*
281 * Check if we've determined that the KDC is salting keys for this
282 * principal/enctype in a non-obvious way. If it is, try to match
283 * its behavior.
284 */
285 if (no_salt) {
286 KRB5_KEY_DATA(key) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
287 if (!KRB5_KEY_DATA(key)) {
288 return ENOMEM;
289 }
290 memcpy(KRB5_KEY_DATA(key), password->data, password->length);
291 KRB5_KEY_LENGTH(key) = password->length;
292 KRB5_KEY_TYPE(key) = enctype;
293 return 0;
294 }
295 salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype);
296 ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype);
297 if (salt_princ) {
298 krb5_free_principal(context, salt_princ);
299 }
300 return ret;
301 }
302
303 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
304 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
305 krb5_enctype **enctypes)
306 {
307 return krb5_get_permitted_enctypes(context, enctypes);
308 }
309 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
310 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
311 krb5_enctype **enctypes)
312 {
313 return krb5_get_default_in_tkt_etypes(context, enctypes);
314 }
315 #else
316 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
317 #endif
318
319 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
320 krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
321 krb5_auth_context auth_context,
322 krb5_keyblock *keyblock)
323 {
324 return krb5_auth_con_setkey(context, auth_context, keyblock);
325 }
326 #endif
327
328 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
329 DATA_BLOB *edata,
330 DATA_BLOB *edata_out)
331 {
332 DATA_BLOB edata_contents;
333 ASN1_DATA *data;
334 int edata_type;
335
336 if (!edata->length) {
337 return False;
338 }
339
340 data = asn1_init(mem_ctx);
341 if (data == NULL) {
342 return false;
343 }
344
345 asn1_load(data, *edata);
346 asn1_start_tag(data, ASN1_SEQUENCE(0));
347 asn1_start_tag(data, ASN1_CONTEXT(1));
348 asn1_read_Integer(data, &edata_type);
349
350 if (edata_type != KRB5_PADATA_PW_SALT) {
351 DEBUG(0,("edata is not of required type %d but of type %d\n",
352 KRB5_PADATA_PW_SALT, edata_type));
353 asn1_free(data);
354 return False;
355 }
356
357 asn1_start_tag(data, ASN1_CONTEXT(2));
358 asn1_read_OctetString(data, talloc_tos(), &edata_contents);
359 asn1_end_tag(data);
360 asn1_end_tag(data);
361 asn1_end_tag(data);
362 asn1_free(data);
363
364 *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
365
366 data_blob_free(&edata_contents);
367
368 return True;
369 }
370
371
372 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
373 {
374 DATA_BLOB pac_contents;
375 ASN1_DATA *data;
376 int data_type;
377
378 if (!auth_data->length) {
379 return False;
380 }
381
382 data = asn1_init(mem_ctx);
383 if (data == NULL) {
384 return false;
385 }
386
387 asn1_load(data, *auth_data);
388 asn1_start_tag(data, ASN1_SEQUENCE(0));
389 asn1_start_tag(data, ASN1_SEQUENCE(0));
390 asn1_start_tag(data, ASN1_CONTEXT(0));
391 asn1_read_Integer(data, &data_type);
392
393 if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) {
394 DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type));
395 asn1_free(data);
396 return False;
397 }
398
399 asn1_end_tag(data);
400 asn1_start_tag(data, ASN1_CONTEXT(1));
401 asn1_read_OctetString(data, talloc_tos(), &pac_contents);
402 asn1_end_tag(data);
403 asn1_end_tag(data);
404 asn1_end_tag(data);
405 asn1_free(data);
406
407 *unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length);
408
409 data_blob_free(&pac_contents);
410
411 return True;
412 }
413
414 bool get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt)
415 {
416 DATA_BLOB auth_data_wrapped;
417 bool got_auth_data_pac = False;
418 int i;
419
420 #if defined(HAVE_KRB5_TKT_ENC_PART2)
421 if (tkt->enc_part2 && tkt->enc_part2->authorization_data &&
422 tkt->enc_part2->authorization_data[0] &&
423 tkt->enc_part2->authorization_data[0]->length)
424 {
425 for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) {
426
427 if (tkt->enc_part2->authorization_data[i]->ad_type !=
428 KRB5_AUTHDATA_IF_RELEVANT) {
429 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
430 tkt->enc_part2->authorization_data[i]->ad_type));
431 continue;
432 }
433
434 auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents,
435 tkt->enc_part2->authorization_data[i]->length);
436
437 /* check if it is a PAC */
438 got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
439 data_blob_free(&auth_data_wrapped);
440
441 if (got_auth_data_pac) {
442 return true;
443 }
444 }
445
446 return got_auth_data_pac;
447 }
448
449 #else
450 if (tkt->ticket.authorization_data &&
451 tkt->ticket.authorization_data->len)
452 {
453 for (i = 0; i < tkt->ticket.authorization_data->len; i++) {
454
455 if (tkt->ticket.authorization_data->val[i].ad_type !=
456 KRB5_AUTHDATA_IF_RELEVANT) {
457 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
458 tkt->ticket.authorization_data->val[i].ad_type));
459 continue;
460 }
461
462 auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data,
463 tkt->ticket.authorization_data->val[i].ad_data.length);
464
465 /* check if it is a PAC */
466 got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
467 data_blob_free(&auth_data_wrapped);
468
469 if (got_auth_data_pac) {
470 return true;
471 }
472 }
473
474 return got_auth_data_pac;
475 }
476 #endif
477 return False;
478 }
479
480 krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
481 {
482 #if defined(HAVE_KRB5_TKT_ENC_PART2)
483 return tkt->enc_part2->client;
484 #else
485 return tkt->client;
486 #endif
487 }
488
489 #if !defined(HAVE_KRB5_LOCATE_KDC)
490
491 /* krb5_locate_kdc is an internal MIT symbol. MIT are not yet willing to commit
492 * to a public interface for this functionality, so we have to be able to live
493 * without it if the MIT libraries are hiding their internal symbols.
494 */
495
496 #if defined(KRB5_KRBHST_INIT)
497 /* Heimdal */
498 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters)
499 {
500 krb5_krbhst_handle hnd;
501 krb5_krbhst_info *hinfo;
502 krb5_error_code rc;
503 int num_kdcs, i;
504 struct sockaddr *sa;
505 struct addrinfo *ai;
506
507 *addr_pp = NULL;
508 *naddrs = 0;
509
510 rc = krb5_krbhst_init(ctx, realm->data, KRB5_KRBHST_KDC, &hnd);
511 if (rc) {
512 DEBUG(0, ("smb_krb5_locate_kdc: krb5_krbhst_init failed (%s)\n", error_message(rc)));
513 return rc;
514 }
515
516 for ( num_kdcs = 0; (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); num_kdcs++)
517 ;
518
519 krb5_krbhst_reset(ctx, hnd);
520
521 if (!num_kdcs) {
522 DEBUG(0, ("smb_krb5_locate_kdc: zero kdcs found !\n"));
523 krb5_krbhst_free(ctx, hnd);
524 return -1;
525 }
526
527 sa = SMB_MALLOC_ARRAY( struct sockaddr, num_kdcs );
528 if (!sa) {
529 DEBUG(0, ("smb_krb5_locate_kdc: malloc failed\n"));
530 krb5_krbhst_free(ctx, hnd);
531 naddrs = 0;
532 return -1;
533 }
534
535 memset(sa, '\0', sizeof(struct sockaddr) * num_kdcs );
536
537 for (i = 0; i < num_kdcs && (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); i++) {
538
539 #if defined(HAVE_KRB5_KRBHST_GET_ADDRINFO)
540 rc = krb5_krbhst_get_addrinfo(ctx, hinfo, &ai);
541 if (rc) {
542 DEBUG(0,("krb5_krbhst_get_addrinfo failed: %s\n", error_message(rc)));
543 continue;
544 }
545 #endif
546 if (hinfo->ai && hinfo->ai->ai_family == AF_INET)
547 memcpy(&sa[i], hinfo->ai->ai_addr, sizeof(struct sockaddr));
548 }
549
550 krb5_krbhst_free(ctx, hnd);
551
552 *naddrs = num_kdcs;
553 *addr_pp = sa;
554 return 0;
555 }
556
557 #else /* ! defined(KRB5_KRBHST_INIT) */
558
559 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
560 struct sockaddr **addr_pp, int *naddrs, int get_masters)
561 {
562 DEBUG(0, ("unable to explicitly locate the KDC on this platform\n"));
563 return KRB5_KDC_UNREACH;
564 }
565
566 #endif /* KRB5_KRBHST_INIT */
567
568 #else /* ! HAVE_KRB5_LOCATE_KDC */
569
570 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
571 struct sockaddr **addr_pp, int *naddrs, int get_masters)
572 {
573 return krb5_locate_kdc(ctx, realm, addr_pp, naddrs, get_masters);
574 }
575
576 #endif /* HAVE_KRB5_LOCATE_KDC */
577
578 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
579 void krb5_free_unparsed_name(krb5_context context, char *val)
580 {
581 SAFE_FREE(val);
582 }
583 #endif
584
585 void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
586 {
587 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
588 if (pdata->data) {
589 krb5_free_data_contents(context, pdata);
590 }
591 #else
592 SAFE_FREE(pdata->data);
593 #endif
594 }
595
596 void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype)
597 {
598 #if defined(HAVE_KRB5_KEYBLOCK_IN_CREDS)
599 KRB5_KEY_TYPE((&pcreds->keyblock)) = enctype;
600 #elif defined(HAVE_KRB5_SESSION_IN_CREDS)
601 KRB5_KEY_TYPE((&pcreds->session)) = enctype;
602 #else
603 #error UNKNOWN_KEYBLOCK_MEMBER_IN_KRB5_CREDS_STRUCT
604 #endif
605 }
606
607 bool kerberos_compatible_enctypes(krb5_context context,
608 krb5_enctype enctype1,
609 krb5_enctype enctype2)
610 {
611 #if defined(HAVE_KRB5_C_ENCTYPE_COMPARE)
612 krb5_boolean similar = 0;
613
614 krb5_c_enctype_compare(context, enctype1, enctype2, &similar);
615 return similar ? True : False;
616 #elif defined(HAVE_KRB5_ENCTYPES_COMPATIBLE_KEYS)
617 return krb5_enctypes_compatible_keys(context, enctype1, enctype2) ? True : False;
618 #endif
619 }
620
621 static bool ads_cleanup_expired_creds(krb5_context context,
622 krb5_ccache ccache,
623 krb5_creds *credsp)
624 {
625 krb5_error_code retval;
626 const char *cc_type = krb5_cc_get_type(context, ccache);
627
628 DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
629 cc_type, krb5_cc_get_name(context, ccache),
630 http_timestring(talloc_tos(), credsp->times.endtime)));
631
632 /* we will probably need new tickets if the current ones
633 will expire within 10 seconds.
634 */
635 if (credsp->times.endtime >= (time(NULL) + 10))
636 return False;
637
638 /* heimdal won't remove creds from a file ccache, and
639 perhaps we shouldn't anyway, since internally we
640 use memory ccaches, and a FILE one probably means that
641 we're using creds obtained outside of our exectuable
642 */
643 if (strequal(cc_type, "FILE")) {
644 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
645 return False;
646 }
647
648 retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
649 if (retval) {
650 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
651 error_message(retval)));
652 /* If we have an error in this, we want to display it,
653 but continue as though we deleted it */
654 }
655 return True;
656 }
657
658 /* Allocate and setup the auth context into the state we need. */
659
660 static krb5_error_code setup_auth_context(krb5_context context,
661 krb5_auth_context *auth_context)
662 {
663 krb5_error_code retval;
664
665 retval = krb5_auth_con_init(context, auth_context );
666 if (retval) {
667 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
668 error_message(retval)));
669 return retval;
670 }
671
672 /* Ensure this is an addressless ticket. */
673 retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
674 if (retval) {
675 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
676 error_message(retval)));
677 }
678
679 return retval;
680 }
681
682 static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
683 uint32_t gss_flags)
684 {
685 unsigned int orig_length = in_data->length;
686 unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
687 char *gss_cksum = NULL;
688
689 if (orig_length) {
690 /* Extra length field for delgated ticket. */
691 base_cksum_size += 4;
692 }
693
694 if ((unsigned int)base_cksum_size + orig_length <
695 (unsigned int)base_cksum_size) {
696 return EINVAL;
697 }
698
699 gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
700 if (gss_cksum == NULL) {
701 return ENOMEM;
702 }
703
704 memset(gss_cksum, '\0', base_cksum_size + orig_length);
705 SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
706
707 /* Precalculated MD5sum of NULL channel bindings (20 bytes) */
708 /* Channel bindings are: (all ints encoded as little endian)
709
710 [4 bytes] initiator_addrtype (255 for null bindings)
711 [4 bytes] initiator_address length
712 [n bytes] .. initiator_address data - not present
713 in null bindings.
714 [4 bytes] acceptor_addrtype (255 for null bindings)
715 [4 bytes] acceptor_address length
716 [n bytes] .. acceptor_address data - not present
717 in null bindings.
718 [4 bytes] application_data length
719 [n bytes] .. application_ data - not present
720 in null bindings.
721 MD5 of this is ""\x14\x8f\x0c\xf7\xb1u\xdey*J\x9a%\xdfV\xc5\x18"
722 */
723
724 memcpy(&gss_cksum[4],
725 "\x14\x8f\x0c\xf7\xb1u\xdey*J\x9a%\xdfV\xc5\x18",
726 GSSAPI_BNDLENGTH);
727
728 SIVAL(gss_cksum, 20, gss_flags);
729
730 if (orig_length) {
731 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
732 SSVAL(gss_cksum, 26, orig_length);
733 /* Copy the kerberos KRB_CRED data */
734 memcpy(gss_cksum + 28, in_data->data, orig_length);
735 free(in_data->data);
736 in_data->data = NULL;
737 in_data->length = 0;
738 }
739 in_data->data = gss_cksum;
740 in_data->length = base_cksum_size + orig_length;
741 return 0;
742 }
743
744 /*
745 we can't use krb5_mk_req because w2k wants the service to be in a particular format
746 */
747 static krb5_error_code ads_krb5_mk_req(krb5_context context,
748 krb5_auth_context *auth_context,
749 const krb5_flags ap_req_options,
750 const char *principal,
751 krb5_ccache ccache,
752 krb5_data *outbuf,
753 time_t *expire_time,
754 const char *impersonate_princ_s)
755 {
756 krb5_error_code retval;
757 krb5_principal server;
758 krb5_principal impersonate_princ = NULL;
759 krb5_creds * credsp;
760 krb5_creds creds;
761 krb5_data in_data;
762 bool creds_ready = False;
763 int i = 0, maxtries = 3;
764 uint32_t gss_flags = 0;
765
766 ZERO_STRUCT(in_data);
767
768 retval = smb_krb5_parse_name(context, principal, &server);
769 if (retval) {
770 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
771 return retval;
772 }
773
774 if (impersonate_princ_s) {
775 retval = smb_krb5_parse_name(context, impersonate_princ_s,
776 &impersonate_princ);
777 if (retval) {
778 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
779 goto cleanup_princ;
780 }
781 }
782
783 /* obtain ticket & session key */
784 ZERO_STRUCT(creds);
785 if ((retval = krb5_copy_principal(context, server, &creds.server))) {
786 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
787 error_message(retval)));
788 goto cleanup_princ;
789 }
790
791 if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
792 /* This can commonly fail on smbd startup with no ticket in the cache.
793 * Report at higher level than 1. */
794 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
795 error_message(retval)));
796 goto cleanup_creds;
797 }
798
799 while (!creds_ready && (i < maxtries)) {
800
801 if ((retval = smb_krb5_get_credentials(context, ccache,
802 creds.client,
803 creds.server,
804 impersonate_princ,
805 &credsp))) {
806 DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
807 principal, error_message(retval)));
808 goto cleanup_creds;
809 }
810
811 /* cope with ticket being in the future due to clock skew */
812 if ((unsigned)credsp->times.starttime > time(NULL)) {
813 time_t t = time(NULL);
814 int time_offset =(int)((unsigned)credsp->times.starttime-t);
815 DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
816 krb5_set_real_time(context, t + time_offset + 1, 0);
817 }
818
819 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
820 creds_ready = True;
821 }
822
823 i++;
824 }
825
826 DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
827 principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
828 http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
829 (unsigned)credsp->times.endtime));
830
831 if (expire_time) {
832 *expire_time = (time_t)credsp->times.endtime;
833 }
834
835 /* Allocate the auth_context. */
836 retval = setup_auth_context(context, auth_context);
837 if (retval) {
838 DEBUG(1,("setup_auth_context failed (%s)\n",
839 error_message(retval)));
840 goto cleanup_creds;
841 }
842
843 #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)
844 if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
845 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
846 as part of the kerberos exchange. */
847
848 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n") );
849
850 retval = krb5_auth_con_setuseruserkey(context,
851 *auth_context,
852 &credsp->keyblock );
853 if (retval) {
854 DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
855 error_message(retval)));
856 goto cleanup_creds;
857 }
858
859 /* Must use a subkey for forwarded tickets. */
860 retval = krb5_auth_con_setflags(context,
861 *auth_context,
862 KRB5_AUTH_CONTEXT_USE_SUBKEY);
863 if (retval) {
864 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
865 error_message(retval)));
866 goto cleanup_creds;
867 }
868
869 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
870 *auth_context, /* Authentication context [in] */
871 CONST_DISCARD(char *, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
872 credsp->client, /* Client principal for the tgt [in] */
873 credsp->server, /* Server principal for the tgt [in] */
874 ccache, /* Credential cache to use for storage [in] */
875 1, /* Turn on for "Forwardable ticket" [in] */
876 &in_data ); /* Resulting response [out] */
877
878 if (retval) {
879 DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
880 error_message( retval ) ) );
881
882 /*
883 * This is not fatal. Delete the *auth_context and continue
884 * with krb5_mk_req_extended to get a non-forwardable ticket.
885 */
886
887 if (in_data.data) {
888 free( in_data.data );
889 in_data.data = NULL;
890 in_data.length = 0;
891 }
892 krb5_auth_con_free(context, *auth_context);
893 *auth_context = NULL;
894 retval = setup_auth_context(context, auth_context);
895 if (retval) {
896 DEBUG(1,("setup_auth_context failed (%s)\n",
897 error_message(retval)));
898 goto cleanup_creds;
899 }
900 } else {
901 /* We got a delegated ticket. */
902 gss_flags |= GSS_C_DELEG_FLAG;
903 }
904 }
905
906 /* Frees and reallocates in_data into a GSS checksum blob. */
907 retval = create_gss_checksum(&in_data, gss_flags);
908 if (retval) {
909 goto cleanup_data;
910 }
911
912 /* We always want GSS-checksum types. */
913 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
914 if (retval) {
915 DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
916 error_message(retval)));
917 goto cleanup_data;
918 }
919 #endif
920
921 retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
922 &in_data, credsp, outbuf);
923 if (retval) {
924 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
925 error_message(retval)));
926 }
927
928 cleanup_data:
929 if (in_data.data) {
930 free( in_data.data );
931 in_data.length = 0;
932 }
933
934 krb5_free_creds(context, credsp);
935
936 cleanup_creds:
937 krb5_free_cred_contents(context, &creds);
938
939 cleanup_princ:
940 krb5_free_principal(context, server);
941 if (impersonate_princ) {
942 krb5_free_principal(context, impersonate_princ);
943 }
944
945 return retval;
946 }
947
948 /*
949 get a kerberos5 ticket for the given service
950 */
951 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
952 const char *principal, time_t time_offset,
953 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
954 uint32_t extra_ap_opts, const char *ccname,
955 time_t *tgs_expire,
956 const char *impersonate_princ_s)
957
958 {
959 krb5_error_code retval;
960 krb5_data packet;
961 krb5_context context = NULL;
962 krb5_ccache ccdef = NULL;
963 krb5_auth_context auth_context = NULL;
964 krb5_enctype enc_types[] = {
965 ENCTYPE_ARCFOUR_HMAC,
966 ENCTYPE_DES_CBC_MD5,
967 ENCTYPE_DES_CBC_CRC,
968 ENCTYPE_NULL};
969
970 initialize_krb5_error_table();
971 retval = krb5_init_context(&context);
972 if (retval) {
973 DEBUG(1, ("krb5_init_context failed (%s)\n",
974 error_message(retval)));
975 goto failed;
976 }
977
978 if (time_offset != 0) {
979 krb5_set_real_time(context, time(NULL) + time_offset, 0);
980 }
981
982 if ((retval = krb5_cc_resolve(context, ccname ?
983 ccname : krb5_cc_default_name(context), &ccdef))) {
984 DEBUG(1, ("krb5_cc_default failed (%s)\n",
985 error_message(retval)));
986 goto failed;
987 }
988
989 if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
990 DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
991 error_message(retval)));
992 goto failed;
993 }
994
995 retval = ads_krb5_mk_req(context, &auth_context,
996 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
997 principal, ccdef, &packet,
998 tgs_expire, impersonate_princ_s);
999 if (retval) {
1000 goto failed;
1001 }
1002
1003 get_krb5_smb_session_key(mem_ctx, context, auth_context,
1004 session_key_krb5, false);
1005
1006 *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
1007
1008 kerberos_free_data_contents(context, &packet);
1009
1010 failed:
1011
1012 if (context) {
1013 if (ccdef)
1014 krb5_cc_close(context, ccdef);
1015 if (auth_context)
1016 krb5_auth_con_free(context, auth_context);
1017 krb5_free_context(context);
1018 }
1019
1020 return retval;
1021 }
1022
1023 bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
1024 krb5_context context,
1025 krb5_auth_context auth_context,
1026 DATA_BLOB *session_key, bool remote)
1027 {
1028 krb5_keyblock *skey = NULL;
1029 krb5_error_code err = 0;
1030 bool ret = false;
1031
1032 if (remote) {
1033 err = krb5_auth_con_getremotesubkey(context,
1034 auth_context, &skey);
1035 } else {
1036 err = krb5_auth_con_getlocalsubkey(context,
1037 auth_context, &skey);
1038 }
1039
1040 if (err || skey == NULL) {
1041 DEBUG(10, ("KRB5 error getting session key %d\n", err));
1042 goto done;
1043 }
1044
1045 DEBUG(10, ("Got KRB5 session key of length %d\n",
1046 (int)KRB5_KEY_LENGTH(skey)));
1047
1048 *session_key = data_blob_talloc(mem_ctx,
1049 KRB5_KEY_DATA(skey),
1050 KRB5_KEY_LENGTH(skey));
1051 dump_data_pw("KRB5 Session Key:\n",
1052 session_key->data,
1053 session_key->length);
1054
1055 ret = true;
1056
1057 done:
1058 if (skey) {
1059 krb5_free_keyblock(context, skey);
1060 }
1061
1062 return ret;
1063 }
1064
1065
1066 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
1067 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
1068
1069 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
1070 {
1071 static krb5_data kdata;
1072
1073 kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
1074 kdata.length = strlen((const char *)kdata.data);
1075 return &kdata;
1076 }
1077 #endif
1078
1079 krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
1080 {
1081 /* Try krb5_free_keytab_entry_contents first, since
1082 * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
1083 * krb5_kt_free_entry but only has a prototype for the first, while the
1084 * second is considered private.
1085 */
1086 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
1087 return krb5_free_keytab_entry_contents(context, kt_entry);
1088 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
1089 return krb5_kt_free_entry(context, kt_entry);
1090 #else
1091 #error UNKNOWN_KT_FREE_FUNCTION
1092 #endif
1093 }
1094
1095 void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
1096 struct PAC_SIGNATURE_DATA *sig)
1097 {
1098 #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
1099 cksum->cksumtype = (krb5_cksumtype)sig->type;
1100 cksum->checksum.length = sig->signature.length;
1101 cksum->checksum.data = sig->signature.data;
1102 #else
1103 cksum->checksum_type = (krb5_cksumtype)sig->type;
1104 cksum->length = sig->signature.length;
1105 cksum->contents = sig->signature.data;
1106 #endif
1107 }
1108
1109 krb5_error_code smb_krb5_verify_checksum(krb5_context context,
1110 const krb5_keyblock *keyblock,
1111 krb5_keyusage usage,
1112 krb5_checksum *cksum,
1113 uint8 *data,
1114 size_t length)
1115 {
1116 krb5_error_code ret;
1117
1118 /* verify the checksum */
1119
1120 /* welcome to the wonderful world of samba's kerberos abstraction layer:
1121 *
1122 * function heimdal 0.6.1rc3 heimdal 0.7 MIT krb 1.4.2
1123 * -----------------------------------------------------------------------------
1124 * krb5_c_verify_checksum - works works
1125 * krb5_verify_checksum works (6 args) works (6 args) broken (7 args)
1126 */
1127
1128 #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
1129 {
1130 krb5_boolean checksum_valid = False;
1131 krb5_data input;
1132
1133 input.data = (char *)data;
1134 input.length = length;
1135
1136 ret = krb5_c_verify_checksum(context,
1137 keyblock,
1138 usage,
1139 &input,
1140 cksum,
1141 &checksum_valid);
1142 if (ret) {
1143 DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
1144 error_message(ret)));
1145 return ret;
1146 }
1147
1148 if (!checksum_valid)
1149 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1150 }
1151
1152 #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
1153
1154 /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
1155 * without enctype and it ignores any key_usage types - Guenther */
1156
1157 {
1158
1159 krb5_crypto crypto;
1160 ret = krb5_crypto_init(context,
1161 keyblock,
1162 0,
1163 &crypto);
1164 if (ret) {
1165 DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
1166 error_message(ret)));
1167 return ret;
1168 }
1169
1170 ret = krb5_verify_checksum(context,
1171 crypto,
1172 usage,
1173 data,
1174 length,
1175 cksum);
1176
1177 krb5_crypto_destroy(context, crypto);
1178 }
1179
1180 #else
1181 #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
1182 #endif
1183
1184 return ret;
1185 }
1186
1187 time_t get_authtime_from_tkt(krb5_ticket *tkt)
1188 {
1189 #if defined(HAVE_KRB5_TKT_ENC_PART2)
1190 return tkt->enc_part2->times.authtime;
1191 #else
1192 return tkt->ticket.authtime;
1193 #endif
1194 }
1195
1196 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1197 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
1198 {
1199 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
1200 if (ap_req->ticket->enc_part.kvno)
1201 return ap_req->ticket->enc_part.kvno;
1202 #else /* Heimdal */
1203 if (ap_req->ticket.enc_part.kvno)
1204 return *ap_req->ticket.enc_part.kvno;
1205 #endif
1206 return 0;
1207 }
1208
1209 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
1210 {
1211 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
1212 return ap_req->ticket.enc_part.etype;
1213 #else /* MIT */
1214 return ap_req->ticket->enc_part.enctype;
1215 #endif
1216 }
1217 #endif /* HAVE_KRB5_DECODE_AP_REQ */
1218
1219 static krb5_error_code
1220 get_key_from_keytab(krb5_context context,
1221 krb5_const_principal server,
1222 krb5_enctype enctype,
1223 krb5_kvno kvno,
1224 krb5_keyblock **out_key)
1225 {
1226 krb5_keytab_entry entry;
1227 krb5_error_code ret;
1228 krb5_keytab keytab;
1229 char *name = NULL;
1230 krb5_keyblock *keyp;
1231
1232 /* We have to open a new keytab handle here, as MIT does
1233 an implicit open/getnext/close on krb5_kt_get_entry. We
1234 may be in the middle of a keytab enumeration when this is
1235 called. JRA. */
1236
1237 ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1238 if (ret) {
1239 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1240 return ret;
1241 }
1242
1243 if ( DEBUGLEVEL >= 10 ) {
1244 if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) {
1245 DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1246 kvno, enctype, name));
1247 TALLOC_FREE(name);
1248 }
1249 }
1250
1251 ret = krb5_kt_get_entry(context,
1252 keytab,
1253 server,
1254 kvno,
1255 enctype,
1256 &entry);
1257
1258 if (ret) {
1259 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1260 goto out;
1261 }
1262
1263 keyp = KRB5_KT_KEY(&entry);
1264
1265 ret = krb5_copy_keyblock(context, keyp, out_key);
1266 if (ret) {
1267 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1268 goto out;
1269 }
1270
1271 smb_krb5_kt_free_entry(context, &entry);
1272
1273 out:
1274 krb5_kt_close(context, keytab);
1275 return ret;
1276 }
1277
1278 /* Prototypes */
1279
1280 krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1281 const krb5_data *inbuf,
1282 krb5_kvno *kvno,
1283 krb5_enctype *enctype)
1284 {
1285 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1286 {
1287 krb5_error_code ret;
1288 krb5_ap_req ap_req;
1289
1290 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1291 if (ret)
1292 return ret;
1293
1294 *kvno = get_kvno_from_ap_req(&ap_req);
1295 *enctype = get_enctype_from_ap_req(&ap_req);
1296
1297 free_AP_REQ(&ap_req);
1298 return 0;
1299 }
1300 #endif
1301
1302 /* Possibly not an appropriate error code. */
1303 return KRB5KDC_ERR_BADOPTION;
1304 }
1305
1306 krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1307 krb5_auth_context *auth_context,
1308 const krb5_data *inbuf,
1309 krb5_const_principal server,
1310 krb5_keytab keytab,
1311 krb5_flags *ap_req_options,
1312 krb5_ticket **ticket,
1313 krb5_keyblock **keyblock)
1314 {
1315 krb5_error_code ret;
1316 krb5_kvno kvno;
1317 krb5_enctype enctype;
1318 krb5_keyblock *local_keyblock;
1319
1320 ret = krb5_rd_req(context,
1321 auth_context,
1322 inbuf,
1323 server,
1324 keytab,
1325 ap_req_options,
1326 ticket);
1327 if (ret) {
1328 return ret;
1329 }
1330
1331 #ifdef KRB5_TICKET_HAS_KEYINFO
1332 enctype = (*ticket)->enc_part.enctype;
1333 kvno = (*ticket)->enc_part.kvno;
1334 #else
1335 ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1336 if (ret) {
1337 return ret;
1338 }
1339 #endif
1340
1341 ret = get_key_from_keytab(context,
1342 server,
1343 enctype,
1344 kvno,
1345 &local_keyblock);
1346 if (ret) {
1347 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1348 goto out;
1349 }
1350
1351 out:
1352 if (ret && local_keyblock != NULL) {
1353 krb5_free_keyblock(context, local_keyblock);
1354 } else {
1355 *keyblock = local_keyblock;
1356 }
1357
1358 return ret;
1359 }
1360
1361 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1362 const char *name,
1363 krb5_principal *principal)
1364 {
1365 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1366 return smb_krb5_parse_name_norealm_conv(context, name, principal);
1367 #endif
1368
1369 /* we are cheating here because parse_name will in fact set the realm.
1370 * We don't care as the only caller of smb_krb5_parse_name_norealm
1371 * ignores the realm anyway when calling
1372 * smb_krb5_principal_compare_any_realm later - Guenther */
1373
1374 return smb_krb5_parse_name(context, name, principal);
1375 }
1376
1377 bool smb_krb5_principal_compare_any_realm(krb5_context context,
1378 krb5_const_principal princ1,
1379 krb5_const_principal princ2)
1380 {
1381 #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1382
1383 return krb5_principal_compare_any_realm(context, princ1, princ2);
1384
1385 /* krb5_princ_size is a macro in MIT */
1386 #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1387
1388 int i, len1, len2;
1389 const krb5_data *p1, *p2;
1390
1391 len1 = krb5_princ_size(context, princ1);
1392 len2 = krb5_princ_size(context, princ2);
1393
1394 if (len1 != len2)
1395 return False;
1396
1397 for (i = 0; i < len1; i++) {
1398
1399 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1400 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1401
1402 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1403 return False;
1404 }
1405
1406 return True;
1407 #else
1408 #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1409 #endif
1410 }
1411
1412 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, /* FILE:/tmp/krb5cc_0 */
1413 const char *client_string, /* gd@BER.SUSE.DE */
1414 const char *service_string, /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1415 time_t *expire_time)
1416 {
1417 krb5_error_code ret;
1418 krb5_context context = NULL;
1419 krb5_ccache ccache = NULL;
1420 krb5_principal client = NULL;
1421 krb5_creds creds, creds_in, *creds_out = NULL;
1422
1423 ZERO_STRUCT(creds);
1424 ZERO_STRUCT(creds_in);
1425
1426 initialize_krb5_error_table();
1427 ret = krb5_init_context(&context);
1428 if (ret) {
1429 goto done;
1430 }
1431
1432 if (!ccache_string) {
1433 ccache_string = krb5_cc_default_name(context);
1434 }
1435
1436 if (!ccache_string) {
1437 ret = EINVAL;
1438 goto done;
1439 }
1440
1441 DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1442
1443 /* FIXME: we should not fall back to defaults */
1444 ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1445 if (ret) {
1446 goto done;
1447 }
1448
1449 if (client_string) {
1450 ret = smb_krb5_parse_name(context, client_string, &client);
1451 if (ret) {
1452 goto done;
1453 }
1454 } else {
1455 ret = krb5_cc_get_principal(context, ccache, &client);
1456 if (ret) {
1457 goto done;
1458 }
1459 }
1460
1461 #ifdef HAVE_KRB5_GET_RENEWED_CREDS /* MIT */
1462 {
1463 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1464 if (ret) {
1465 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1466 goto done;
1467 }
1468 }
1469 #elif defined(HAVE_KRB5_GET_KDC_CRED) /* Heimdal */
1470 {
1471 krb5_kdc_flags flags;
1472 krb5_realm *client_realm = NULL;
1473
1474 ret = krb5_copy_principal(context, client, &creds_in.client);
1475 if (ret) {
1476 goto done;
1477 }
1478
1479 if (service_string) {
1480 ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1481 if (ret) {
1482 goto done;
1483 }
1484 } else {
1485 /* build tgt service by default */
1486 client_realm = krb5_princ_realm(context, creds_in.client);
1487 if (!client_realm) {
1488 ret = ENOMEM;
1489 goto done;
1490 }
1491 ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1492 if (ret) {
1493 goto done;
1494 }
1495 }
1496
1497 flags.i = 0;
1498 flags.b.renewable = flags.b.renew = True;
1499
1500 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1501 if (ret) {
1502 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1503 goto done;
1504 }
1505
1506 creds = *creds_out;
1507 }
1508 #else
1509 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1510 #endif
1511
1512 /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1513 ret = krb5_cc_initialize(context, ccache, client);
1514 if (ret) {
1515 goto done;
1516 }
1517
1518 ret = krb5_cc_store_cred(context, ccache, &creds);
1519
1520 if (expire_time) {
1521 *expire_time = (time_t) creds.times.endtime;
1522 }
1523
1524 done:
1525 krb5_free_cred_contents(context, &creds_in);
1526
1527 if (creds_out) {
1528 krb5_free_creds(context, creds_out);
1529 } else {
1530 krb5_free_cred_contents(context, &creds);
1531 }
1532
1533 if (client) {
1534 krb5_free_principal(context, client);
1535 }
1536 if (ccache) {
1537 krb5_cc_close(context, ccache);
1538 }
1539 if (context) {
1540 krb5_free_context(context);
1541 }
1542
1543 return ret;
1544 }
1545
1546 krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1547 {
1548 krb5_error_code ret = 0;
1549 if (addr == NULL) {
1550 return ret;
1551 }
1552 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1553 krb5_free_addresses(context, addr->addrs);
1554 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1555 ret = krb5_free_addresses(context, addr->addrs);
1556 SAFE_FREE(addr->addrs);
1557 #endif
1558 SAFE_FREE(addr);
1559 addr = NULL;
1560 return ret;
1561 }
1562
1563 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1564 {
1565 krb5_error_code ret = 0;
1566 nstring buf;
1567 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1568 krb5_address **addrs = NULL;
1569 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1570 krb5_addresses *addrs = NULL;
1571 #endif
1572
1573 *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1574 if (*kerb_addr == NULL) {
1575 return ENOMEM;
1576 }
1577
1578 put_name(buf, global_myname(), ' ', 0x20);
1579
1580 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1581 {
1582 int num_addr = 2;
1583
1584 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1585 if (addrs == NULL) {
1586 SAFE_FREE(*kerb_addr);
1587 return ENOMEM;
1588 }
1589
1590 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1591
1592 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1593 if (addrs[0] == NULL) {
1594 SAFE_FREE(addrs);
1595 SAFE_FREE(*kerb_addr);
1596 return ENOMEM;
1597 }
1598
1599 addrs[0]->magic = KV5M_ADDRESS;
1600 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1601 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1602 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1603 if (addrs[0]->contents == NULL) {
1604 SAFE_FREE(addrs[0]);
1605 SAFE_FREE(addrs);
1606 SAFE_FREE(*kerb_addr);
1607 return ENOMEM;
1608 }
1609
1610 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1611
1612 addrs[1] = NULL;
1613 }
1614 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1615 {
1616 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1617 if (addrs == NULL) {
1618 SAFE_FREE(*kerb_addr);
1619 return ENOMEM;
1620 }
1621
1622 memset(addrs, 0, sizeof(krb5_addresses));
1623
1624 addrs->len = 1;
1625 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1626 if (addrs->val == NULL) {
1627 SAFE_FREE(addrs);
1628 SAFE_FREE(kerb_addr);
1629 return ENOMEM;
1630 }
1631
1632 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1633 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1634 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1635 if (addrs->val[0].address.data == NULL) {
1636 SAFE_FREE(addrs->val);
1637 SAFE_FREE(addrs);
1638 SAFE_FREE(*kerb_addr);
1639 return ENOMEM;
1640 }
1641
1642 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1643 }
1644 #else
1645 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1646 #endif
1647 (*kerb_addr)->addrs = addrs;
1648
1649 return ret;
1650 }
1651
1652 void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1653 {
1654 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1655 krb5_free_error_contents(context, krberror);
1656 #else /* MIT */
1657 krb5_free_error(context, krberror);
1658 #endif
1659 }
1660
1661 krb5_error_code handle_krberror_packet(krb5_context context,
1662 krb5_data *packet)
1663 {
1664 krb5_error_code ret;
1665 bool got_error_code = False;
1666
1667 DEBUG(10,("handle_krberror_packet: got error packet\n"));
1668
1669 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1670 {
1671 krb5_error krberror;
1672
1673 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1674 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1675 error_message(ret)));
1676 return ret;
1677 }
1678
1679 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1680 ret = (krb5_error_code) krberror.error_code;
1681 got_error_code = True;
1682 }
1683
1684 smb_krb5_free_error(context, &krberror);
1685 }
1686 #else /* MIT */
1687 {
1688 krb5_error *krberror;
1689
1690 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1691 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1692 error_message(ret)));
1693 return ret;
1694 }
1695
1696 if (krberror->e_data.data == NULL) {
1697 #if defined(ERROR_TABLE_BASE_krb5)
1698 ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1699 #else
1700 ret = (krb5_error_code)krberror->error;
1701 #endif
1702 got_error_code = True;
1703 }
1704 smb_krb5_free_error(context, krberror);
1705 }
1706 #endif
1707 if (got_error_code) {
1708 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1709 error_message(ret), ret));
1710 }
1711 return ret;
1712 }
1713
1714 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1715 krb5_get_init_creds_opt **opt)
1716 {
1717 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1718 /* Heimdal or modern MIT version */
1719 return krb5_get_init_creds_opt_alloc(context, opt);
1720 #else
1721 /* Historical MIT version */
1722 krb5_get_init_creds_opt *my_opt;
1723
1724 *opt = NULL;
1725
1726 if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1727 return ENOMEM;
1728 }
1729
1730 krb5_get_init_creds_opt_init(my_opt);
1731
1732 *opt = my_opt;
1733 return 0;
1734 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC */
1735 }
1736
1737 void smb_krb5_get_init_creds_opt_free(krb5_context context,
1738 krb5_get_init_creds_opt *opt)
1739 {
1740 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1741
1742 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1743 /* Modern MIT or Heimdal version */
1744 krb5_get_init_creds_opt_free(context, opt);
1745 #else
1746 /* Heimdal version */
1747 krb5_get_init_creds_opt_free(opt);
1748 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1749
1750 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1751 /* Historical MIT version */
1752 SAFE_FREE(opt);
1753 opt = NULL;
1754 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1755 }
1756
1757 krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1758 {
1759 return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1760 }
1761
1762
1763 /* caller needs to free etype_s */
1764 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1765 krb5_enctype enctype,
1766 char **etype_s)
1767 {
1768 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1769 return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1770 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1771 char buf[256];
1772 krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1773 if (ret) {
1774 return ret;
1775 }
1776 *etype_s = SMB_STRDUP(buf);
1777 if (!*etype_s) {
1778 return ENOMEM;
1779 }
1780 return ret;
1781 #else
1782 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1783 #endif
1784 }
1785
1786 krb5_error_code smb_krb5_mk_error(krb5_context context,
1787 krb5_error_code error_code,
1788 const krb5_principal server,
1789 krb5_data *reply)
1790 {
1791 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1792 /*
1793 * The MIT interface is *terrible*.
1794 * We have to construct this ourselves...
1795 */
1796 krb5_error e;
1797
1798 memset(&e, 0, sizeof(e));
1799 krb5_us_timeofday(context, &e.stime, &e.susec);
1800 e.server = server;
1801 #if defined(krb5_err_base)
1802 e.error = error_code - krb5_err_base;
1803 #elif defined(ERROR_TABLE_BASE_krb5)
1804 e.error = error_code - ERROR_TABLE_BASE_krb5;
1805 #else
1806 e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1807 #endif
1808
1809 return krb5_mk_error(context, &e, reply);
1810 #else /* Heimdal. */
1811 return krb5_mk_error(context,
1812 error_code,
1813 NULL,
1814 NULL, /* e_data */
1815 NULL,
1816 server,
1817 NULL,
1818 NULL,
1819 reply);
1820 #endif
1821 }
1822
1823 /**********************************************************************
1824 * Open a krb5 keytab with flags, handles readonly or readwrite access and
1825 * allows to process non-default keytab names.
1826 * @param context krb5_context
1827 * @param keytab_name_req string
1828 * @param write_access bool if writable keytab is required
1829 * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1830 * @return krb5_error_code
1831 **********************************************************************/
1832
1833 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1834 #ifndef MAX_KEYTAB_NAME_LEN
1835 #define MAX_KEYTAB_NAME_LEN 1100
1836 #endif
1837
1838 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1839 const char *keytab_name_req,
1840 bool write_access,
1841 krb5_keytab *keytab)
1842 {
1843 krb5_error_code ret = 0;
1844 TALLOC_CTX *mem_ctx;
1845 char keytab_string[MAX_KEYTAB_NAME_LEN];
1846 char *kt_str = NULL;
1847 bool found_valid_name = False;
1848 const char *pragma = "FILE";
1849 const char *tmp = NULL;
1850
1851 if (!write_access && !keytab_name_req) {
1852 /* caller just wants to read the default keytab readonly, so be it */
1853 return krb5_kt_default(context, keytab);
1854 }
1855
1856 mem_ctx = talloc_init("smb_krb5_open_keytab");
1857 if (!mem_ctx) {
1858 return ENOMEM;
1859 }
1860
1861 #ifdef HAVE_WRFILE_KEYTAB
1862 if (write_access) {
1863 pragma = "WRFILE";
1864 }
1865 #endif
1866
1867 if (keytab_name_req) {
1868
1869 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1870 ret = KRB5_CONFIG_NOTENUFSPACE;
1871 goto out;
1872 }
1873
1874 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1875 (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1876 tmp = keytab_name_req;
1877 goto resolve;
1878 }
1879
1880 if (keytab_name_req[0] != '/') {
1881 ret = KRB5_KT_BADNAME;
1882 goto out;
1883 }
1884
1885 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1886 if (!tmp) {
1887 ret = ENOMEM;
1888 goto out;
1889 }
1890
1891 goto resolve;
1892 }
1893
1894 /* we need to handle more complex keytab_strings, like:
1895 * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1896
1897 ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1898 if (ret) {
1899 goto out;
1900 }
1901
1902 DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1903
1904 tmp = talloc_strdup(mem_ctx, keytab_string);
1905 if (!tmp) {
1906 ret = ENOMEM;
1907 goto out;
1908 }
1909
1910 if (strncmp(tmp, "ANY:", 4) == 0) {
1911 tmp += 4;
1912 }
1913
1914 memset(&keytab_string, '\0', sizeof(keytab_string));
1915
1916 while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1917 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1918 found_valid_name = True;
1919 tmp = kt_str;
1920 tmp += 7;
1921 }
1922
1923 if (strncmp(kt_str, "FILE:", 5) == 0) {
1924 found_valid_name = True;
1925 tmp = kt_str;
1926 tmp += 5;
1927 }
1928
1929 if (tmp[0] == '/') {
1930 /* Treat as a FILE: keytab definition. */
1931 found_valid_name = true;
1932 }
1933
1934 if (found_valid_name) {
1935 if (tmp[0] != '/') {
1936 ret = KRB5_KT_BADNAME;
1937 goto out;
1938 }
1939
1940 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1941 if (!tmp) {
1942 ret = ENOMEM;
1943 goto out;
1944 }
1945 break;
1946 }
1947 }
1948
1949 if (!found_valid_name) {
1950 ret = KRB5_KT_UNKNOWN_TYPE;
1951 goto out;
1952 }
1953
1954 resolve:
1955 DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1956 ret = krb5_kt_resolve(context, tmp, keytab);
1957
1958 out:
1959 TALLOC_FREE(mem_ctx);
1960 return ret;
1961 }
1962
1963 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1964 krb5_context context,
1965 krb5_keytab keytab,
1966 const char **keytab_name)
1967 {
1968 char keytab_string[MAX_KEYTAB_NAME_LEN];
1969 krb5_error_code ret = 0;
1970
1971 ret = krb5_kt_get_name(context, keytab,
1972 keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1973 if (ret) {
1974 return ret;
1975 }
1976
1977 *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1978 if (!*keytab_name) {
1979 return ENOMEM;
1980 }
1981
1982 return ret;
1983 }
1984
1985 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1986 defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1987 defined(HAVE_KRB5_GET_CREDS)
1988 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1989 krb5_ccache ccache,
1990 krb5_principal me,
1991 krb5_principal server,
1992 krb5_principal impersonate_princ,
1993 krb5_creds **out_creds)
1994 {
1995 krb5_error_code ret;
1996 krb5_get_creds_opt opt;
1997
1998 ret = krb5_get_creds_opt_alloc(context, &opt);
1999 if (ret) {
2000 goto done;
2001 }
2002 krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
2003
2004 if (impersonate_princ) {
2005 ret = krb5_get_creds_opt_set_impersonate(context, opt,
2006 impersonate_princ);
2007 if (ret) {
2008 goto done;
2009 }
2010 }
2011
2012 ret = krb5_get_creds(context, opt, ccache, server, out_creds);
2013 if (ret) {
2014 goto done;
2015 }
2016
2017 done:
2018 if (opt) {
2019 krb5_get_creds_opt_free(context, opt);
2020 }
2021 return ret;
2022 }
2023 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
2024
2025 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
2026 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
2027 krb5_ccache ccache,
2028 krb5_principal me,
2029 krb5_principal server,
2030 krb5_principal impersonate_princ,
2031 krb5_creds **out_creds)
2032 {
2033 krb5_error_code ret;
2034 krb5_creds in_creds;
2035
2036 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
2037 krb5_error_code KRB5_CALLCONV
2038 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
2039 krb5_ccache ccache, krb5_creds *in_creds,
2040 krb5_data *subject_cert,
2041 krb5_creds **out_creds);
2042 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
2043
2044 ZERO_STRUCT(in_creds);
2045
2046 if (impersonate_princ) {
2047
2048 in_creds.server = me;
2049 in_creds.client = impersonate_princ;
2050
2051 ret = krb5_get_credentials_for_user(context,
2052 0, /* krb5_flags options */
2053 ccache,
2054 &in_creds,
2055 NULL, /* krb5_data *subject_cert */
2056 out_creds);
2057 } else {
2058 in_creds.client = me;
2059 in_creds.server = server;
2060
2061 ret = krb5_get_credentials(context, 0, ccache,
2062 &in_creds, out_creds);
2063 }
2064
2065 return ret;
2066 }
2067 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
2068
2069 /*
2070 * smb_krb5_get_credentials
2071 *
2072 * @brief Get krb5 credentials for a server
2073 *
2074 * @param[in] context An initialized krb5_context
2075 * @param[in] ccache An initialized krb5_ccache
2076 * @param[in] me The krb5_principal of the caller
2077 * @param[in] server The krb5_principal of the requested service
2078 * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
2079 * @param[out] out_creds The returned krb5_creds structure
2080 * @return krb5_error_code
2081 *
2082 */
2083 krb5_error_code smb_krb5_get_credentials(krb5_context context,
2084 krb5_ccache ccache,
2085 krb5_principal me,
2086 krb5_principal server,
2087 krb5_principal impersonate_princ,
2088 krb5_creds **out_creds)
2089 {
2090 krb5_error_code ret;
2091 krb5_creds *creds = NULL;
2092
2093 *out_creds = NULL;
2094
2095 if (impersonate_princ) {
2096 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
2097 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
2098 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
2099 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
2100 #else
2101 ret = ENOTSUP;
2102 #endif
2103 } else {
2104 krb5_creds in_creds;
2105
2106 ZERO_STRUCT(in_creds);
2107
2108 in_creds.client = me;
2109 in_creds.server = server;
2110
2111 ret = krb5_get_credentials(context, 0, ccache,
2112 &in_creds, &creds);
2113 }
2114 if (ret) {
2115 goto done;
2116 }
2117
2118 ret = krb5_cc_store_cred(context, ccache, creds);
2119 if (ret) {
2120 goto done;
2121 }
2122
2123 if (out_creds) {
2124 *out_creds = creds;
2125 }
2126
2127 done:
2128 if (creds && ret) {
2129 krb5_free_creds(context, creds);
2130 }
2131
2132 return ret;
2133 }
2134
2135 /*
2136 * smb_krb5_get_creds
2137 *
2138 * @brief Get krb5 credentials for a server
2139 *
2140 * @param[in] server_s The string name of the service
2141 * @param[in] time_offset The offset to the KDCs time in seconds (optional)
2142 * @param[in] cc The krb5 credential cache string name (optional)
2143 * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
2144 * @param[out] creds_p The returned krb5_creds structure
2145 * @return krb5_error_code
2146 *
2147 */
2148 krb5_error_code smb_krb5_get_creds(const char *server_s,
2149 time_t time_offset,
2150 const char *cc,
2151 const char *impersonate_princ_s,
2152 krb5_creds **creds_p)
2153 {
2154 krb5_error_code ret;
2155 krb5_context context = NULL;
2156 krb5_principal me = NULL;
2157 krb5_principal server = NULL;
2158 krb5_principal impersonate_princ = NULL;
2159 krb5_creds *creds = NULL;
2160 krb5_ccache ccache = NULL;
2161
2162 *creds_p = NULL;
2163
2164 initialize_krb5_error_table();
2165 ret = krb5_init_context(&context);
2166 if (ret) {
2167 goto done;
2168 }
2169
2170 if (time_offset != 0) {
2171 krb5_set_real_time(context, time(NULL) + time_offset, 0);
2172 }
2173
2174 ret = krb5_cc_resolve(context, cc ? cc :
2175 krb5_cc_default_name(context), &ccache);
2176 if (ret) {
2177 goto done;
2178 }
2179
2180 ret = krb5_cc_get_principal(context, ccache, &me);
2181 if (ret) {
2182 goto done;
2183 }
2184
2185 ret = smb_krb5_parse_name(context, server_s, &server);
2186 if (ret) {
2187 goto done;
2188 }
2189
2190 if (impersonate_princ_s) {
2191 ret = smb_krb5_parse_name(context, impersonate_princ_s,
2192 &impersonate_princ);
2193 if (ret) {
2194 goto done;
2195 }
2196 }
2197
2198 ret = smb_krb5_get_credentials(context, ccache,
2199 me, server, impersonate_princ,
2200 &creds);
2201 if (ret) {
2202 goto done;
2203 }
2204
2205 ret = krb5_cc_store_cred(context, ccache, creds);
2206 if (ret) {
2207 goto done;
2208 }
2209
2210 if (creds_p) {
2211 *creds_p = creds;
2212 }
2213
2214 DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
2215 server_s));
2216
2217 if (impersonate_princ_s) {
2218 char *client = NULL;
2219
2220 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
2221 if (ret) {
2222 goto done;
2223 }
2224 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
2225 client));
2226 TALLOC_FREE(client);
2227 }
2228
2229 done:
2230 if (!context) {
2231 return ret;
2232 }
2233
2234 if (creds && ret) {
2235 krb5_free_creds(context, creds);
2236 }
2237 if (server) {
2238 krb5_free_principal(context, server);
2239 }
2240 if (me) {
2241 krb5_free_principal(context, me);
2242 }
2243 if (impersonate_princ) {
2244 krb5_free_principal(context, impersonate_princ);
2245 }
2246 if (ccache) {
2247 krb5_cc_close(context, ccache);
2248 }
2249 krb5_free_context(context);
2250
2251 return ret;
2252 }
2253
2254 /*
2255 * smb_krb5_principal_get_realm
2256 *
2257 * @brief Get realm of a principal
2258 *
2259 * @param[in] context The krb5_context
2260 * @param[in] principal The principal
2261 * @return pointer to the realm
2262 *
2263 */
2264
2265 char *smb_krb5_principal_get_realm(krb5_context context,
2266 krb5_principal principal)
2267 {
2268 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2269 return krb5_principal_get_realm(context, principal);
2270 #elif defined(krb5_princ_realm) /* MIT */
2271 krb5_data *realm;
2272 realm = krb5_princ_realm(context, principal);
2273 return (char *)realm->data;
2274 #else
2275 return NULL;
2276 #endif
2277 }
2278
2279 #else /* HAVE_KRB5 */
2280 /* this saves a few linking headaches */
2281 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
2282 const char *principal, time_t time_offset,
2283 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
2284 uint32_t extra_ap_opts,
2285 const char *ccname, time_t *tgs_expire,
2286 const char *impersonate_princ_s)
2287 {
2288 DEBUG(0,("NO KERBEROS SUPPORT\n"));
2289 return 1;
2290 }
2291
2292 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
2293 {
2294 DEBUG(0,("NO KERBEROS SUPPORT\n"));
2295 return false;
2296 }
2297
2298 #endif /* HAVE_KRB5 */
reg import