?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
s3-smbclient: Fix cli_errstr() usage (part of bug #7864)
[Samba/vl.git] / source3 / libsmb / clikrb5.c
blobb4962a02032ee35d9fc6e52af873721d60c07823
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 /*
708 * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
709 * This matches the behavior of heimdal and mit.
710 *
711 * And it is needed to work against some closed source
712 * SMB servers.
713 *
714 * See bug #7883
715 */
716 memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
717
718 SIVAL(gss_cksum, 20, gss_flags);
719
720 if (orig_length) {
721 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
722 SSVAL(gss_cksum, 26, orig_length);
723 /* Copy the kerberos KRB_CRED data */
724 memcpy(gss_cksum + 28, in_data->data, orig_length);
725 free(in_data->data);
726 in_data->data = NULL;
727 in_data->length = 0;
728 }
729 in_data->data = gss_cksum;
730 in_data->length = base_cksum_size + orig_length;
731 return 0;
732 }
733
734 /*
735 we can't use krb5_mk_req because w2k wants the service to be in a particular format
736 */
737 static krb5_error_code ads_krb5_mk_req(krb5_context context,
738 krb5_auth_context *auth_context,
739 const krb5_flags ap_req_options,
740 const char *principal,
741 krb5_ccache ccache,
742 krb5_data *outbuf,
743 time_t *expire_time,
744 const char *impersonate_princ_s)
745 {
746 krb5_error_code retval;
747 krb5_principal server;
748 krb5_principal impersonate_princ = NULL;
749 krb5_creds * credsp;
750 krb5_creds creds;
751 krb5_data in_data;
752 bool creds_ready = False;
753 int i = 0, maxtries = 3;
754 uint32_t gss_flags = 0;
755
756 ZERO_STRUCT(in_data);
757
758 retval = smb_krb5_parse_name(context, principal, &server);
759 if (retval) {
760 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
761 return retval;
762 }
763
764 if (impersonate_princ_s) {
765 retval = smb_krb5_parse_name(context, impersonate_princ_s,
766 &impersonate_princ);
767 if (retval) {
768 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
769 goto cleanup_princ;
770 }
771 }
772
773 /* obtain ticket & session key */
774 ZERO_STRUCT(creds);
775 if ((retval = krb5_copy_principal(context, server, &creds.server))) {
776 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
777 error_message(retval)));
778 goto cleanup_princ;
779 }
780
781 if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
782 /* This can commonly fail on smbd startup with no ticket in the cache.
783 * Report at higher level than 1. */
784 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
785 error_message(retval)));
786 goto cleanup_creds;
787 }
788
789 while (!creds_ready && (i < maxtries)) {
790
791 if ((retval = smb_krb5_get_credentials(context, ccache,
792 creds.client,
793 creds.server,
794 impersonate_princ,
795 &credsp))) {
796 DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
797 principal, error_message(retval)));
798 goto cleanup_creds;
799 }
800
801 /* cope with ticket being in the future due to clock skew */
802 if ((unsigned)credsp->times.starttime > time(NULL)) {
803 time_t t = time(NULL);
804 int time_offset =(int)((unsigned)credsp->times.starttime-t);
805 DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
806 krb5_set_real_time(context, t + time_offset + 1, 0);
807 }
808
809 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
810 creds_ready = True;
811 }
812
813 i++;
814 }
815
816 DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
817 principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
818 http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
819 (unsigned)credsp->times.endtime));
820
821 if (expire_time) {
822 *expire_time = (time_t)credsp->times.endtime;
823 }
824
825 /* Allocate the auth_context. */
826 retval = setup_auth_context(context, auth_context);
827 if (retval) {
828 DEBUG(1,("setup_auth_context failed (%s)\n",
829 error_message(retval)));
830 goto cleanup_creds;
831 }
832
833 #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)
834 if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
835 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
836 as part of the kerberos exchange. */
837
838 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n") );
839
840 retval = krb5_auth_con_setuseruserkey(context,
841 *auth_context,
842 &credsp->keyblock );
843 if (retval) {
844 DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
845 error_message(retval)));
846 goto cleanup_creds;
847 }
848
849 /* Must use a subkey for forwarded tickets. */
850 retval = krb5_auth_con_setflags(context,
851 *auth_context,
852 KRB5_AUTH_CONTEXT_USE_SUBKEY);
853 if (retval) {
854 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
855 error_message(retval)));
856 goto cleanup_creds;
857 }
858
859 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
860 *auth_context, /* Authentication context [in] */
861 CONST_DISCARD(char *, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
862 credsp->client, /* Client principal for the tgt [in] */
863 credsp->server, /* Server principal for the tgt [in] */
864 ccache, /* Credential cache to use for storage [in] */
865 1, /* Turn on for "Forwardable ticket" [in] */
866 &in_data ); /* Resulting response [out] */
867
868 if (retval) {
869 DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
870 error_message( retval ) ) );
871
872 /*
873 * This is not fatal. Delete the *auth_context and continue
874 * with krb5_mk_req_extended to get a non-forwardable ticket.
875 */
876
877 if (in_data.data) {
878 free( in_data.data );
879 in_data.data = NULL;
880 in_data.length = 0;
881 }
882 krb5_auth_con_free(context, *auth_context);
883 *auth_context = NULL;
884 retval = setup_auth_context(context, auth_context);
885 if (retval) {
886 DEBUG(1,("setup_auth_context failed (%s)\n",
887 error_message(retval)));
888 goto cleanup_creds;
889 }
890 } else {
891 /* We got a delegated ticket. */
892 gss_flags |= GSS_C_DELEG_FLAG;
893 }
894 }
895
896 /* Frees and reallocates in_data into a GSS checksum blob. */
897 retval = create_gss_checksum(&in_data, gss_flags);
898 if (retval) {
899 goto cleanup_data;
900 }
901
902 /* We always want GSS-checksum types. */
903 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
904 if (retval) {
905 DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
906 error_message(retval)));
907 goto cleanup_data;
908 }
909 #endif
910
911 retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
912 &in_data, credsp, outbuf);
913 if (retval) {
914 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
915 error_message(retval)));
916 }
917
918 cleanup_data:
919 if (in_data.data) {
920 free( in_data.data );
921 in_data.length = 0;
922 }
923
924 krb5_free_creds(context, credsp);
925
926 cleanup_creds:
927 krb5_free_cred_contents(context, &creds);
928
929 cleanup_princ:
930 krb5_free_principal(context, server);
931 if (impersonate_princ) {
932 krb5_free_principal(context, impersonate_princ);
933 }
934
935 return retval;
936 }
937
938 /*
939 get a kerberos5 ticket for the given service
940 */
941 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
942 const char *principal, time_t time_offset,
943 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
944 uint32_t extra_ap_opts, const char *ccname,
945 time_t *tgs_expire,
946 const char *impersonate_princ_s)
947
948 {
949 krb5_error_code retval;
950 krb5_data packet;
951 krb5_context context = NULL;
952 krb5_ccache ccdef = NULL;
953 krb5_auth_context auth_context = NULL;
954 krb5_enctype enc_types[] = {
955 ENCTYPE_ARCFOUR_HMAC,
956 ENCTYPE_DES_CBC_MD5,
957 ENCTYPE_DES_CBC_CRC,
958 ENCTYPE_NULL};
959
960 initialize_krb5_error_table();
961 retval = krb5_init_context(&context);
962 if (retval) {
963 DEBUG(1, ("krb5_init_context failed (%s)\n",
964 error_message(retval)));
965 goto failed;
966 }
967
968 if (time_offset != 0) {
969 krb5_set_real_time(context, time(NULL) + time_offset, 0);
970 }
971
972 if ((retval = krb5_cc_resolve(context, ccname ?
973 ccname : krb5_cc_default_name(context), &ccdef))) {
974 DEBUG(1, ("krb5_cc_default failed (%s)\n",
975 error_message(retval)));
976 goto failed;
977 }
978
979 if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
980 DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
981 error_message(retval)));
982 goto failed;
983 }
984
985 retval = ads_krb5_mk_req(context, &auth_context,
986 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
987 principal, ccdef, &packet,
988 tgs_expire, impersonate_princ_s);
989 if (retval) {
990 goto failed;
991 }
992
993 get_krb5_smb_session_key(mem_ctx, context, auth_context,
994 session_key_krb5, false);
995
996 *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
997
998 kerberos_free_data_contents(context, &packet);
999
1000 failed:
1001
1002 if (context) {
1003 if (ccdef)
1004 krb5_cc_close(context, ccdef);
1005 if (auth_context)
1006 krb5_auth_con_free(context, auth_context);
1007 krb5_free_context(context);
1008 }
1009
1010 return retval;
1011 }
1012
1013 bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
1014 krb5_context context,
1015 krb5_auth_context auth_context,
1016 DATA_BLOB *session_key, bool remote)
1017 {
1018 krb5_keyblock *skey = NULL;
1019 krb5_error_code err = 0;
1020 bool ret = false;
1021
1022 if (remote) {
1023 err = krb5_auth_con_getremotesubkey(context,
1024 auth_context, &skey);
1025 } else {
1026 err = krb5_auth_con_getlocalsubkey(context,
1027 auth_context, &skey);
1028 }
1029
1030 if (err || skey == NULL) {
1031 DEBUG(10, ("KRB5 error getting session key %d\n", err));
1032 goto done;
1033 }
1034
1035 DEBUG(10, ("Got KRB5 session key of length %d\n",
1036 (int)KRB5_KEY_LENGTH(skey)));
1037
1038 *session_key = data_blob_talloc(mem_ctx,
1039 KRB5_KEY_DATA(skey),
1040 KRB5_KEY_LENGTH(skey));
1041 dump_data_pw("KRB5 Session Key:\n",
1042 session_key->data,
1043 session_key->length);
1044
1045 ret = true;
1046
1047 done:
1048 if (skey) {
1049 krb5_free_keyblock(context, skey);
1050 }
1051
1052 return ret;
1053 }
1054
1055
1056 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
1057 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
1058
1059 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
1060 {
1061 static krb5_data kdata;
1062
1063 kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
1064 kdata.length = strlen((const char *)kdata.data);
1065 return &kdata;
1066 }
1067 #endif
1068
1069 krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
1070 {
1071 /* Try krb5_free_keytab_entry_contents first, since
1072 * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
1073 * krb5_kt_free_entry but only has a prototype for the first, while the
1074 * second is considered private.
1075 */
1076 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
1077 return krb5_free_keytab_entry_contents(context, kt_entry);
1078 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
1079 return krb5_kt_free_entry(context, kt_entry);
1080 #else
1081 #error UNKNOWN_KT_FREE_FUNCTION
1082 #endif
1083 }
1084
1085 void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
1086 struct PAC_SIGNATURE_DATA *sig)
1087 {
1088 #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
1089 cksum->cksumtype = (krb5_cksumtype)sig->type;
1090 cksum->checksum.length = sig->signature.length;
1091 cksum->checksum.data = sig->signature.data;
1092 #else
1093 cksum->checksum_type = (krb5_cksumtype)sig->type;
1094 cksum->length = sig->signature.length;
1095 cksum->contents = sig->signature.data;
1096 #endif
1097 }
1098
1099 krb5_error_code smb_krb5_verify_checksum(krb5_context context,
1100 const krb5_keyblock *keyblock,
1101 krb5_keyusage usage,
1102 krb5_checksum *cksum,
1103 uint8 *data,
1104 size_t length)
1105 {
1106 krb5_error_code ret;
1107
1108 /* verify the checksum */
1109
1110 /* welcome to the wonderful world of samba's kerberos abstraction layer:
1111 *
1112 * function heimdal 0.6.1rc3 heimdal 0.7 MIT krb 1.4.2
1113 * -----------------------------------------------------------------------------
1114 * krb5_c_verify_checksum - works works
1115 * krb5_verify_checksum works (6 args) works (6 args) broken (7 args)
1116 */
1117
1118 #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
1119 {
1120 krb5_boolean checksum_valid = False;
1121 krb5_data input;
1122
1123 input.data = (char *)data;
1124 input.length = length;
1125
1126 ret = krb5_c_verify_checksum(context,
1127 keyblock,
1128 usage,
1129 &input,
1130 cksum,
1131 &checksum_valid);
1132 if (ret) {
1133 DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
1134 error_message(ret)));
1135 return ret;
1136 }
1137
1138 if (!checksum_valid)
1139 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1140 }
1141
1142 #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
1143
1144 /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
1145 * without enctype and it ignores any key_usage types - Guenther */
1146
1147 {
1148
1149 krb5_crypto crypto;
1150 ret = krb5_crypto_init(context,
1151 keyblock,
1152 0,
1153 &crypto);
1154 if (ret) {
1155 DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
1156 error_message(ret)));
1157 return ret;
1158 }
1159
1160 ret = krb5_verify_checksum(context,
1161 crypto,
1162 usage,
1163 data,
1164 length,
1165 cksum);
1166
1167 krb5_crypto_destroy(context, crypto);
1168 }
1169
1170 #else
1171 #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
1172 #endif
1173
1174 return ret;
1175 }
1176
1177 time_t get_authtime_from_tkt(krb5_ticket *tkt)
1178 {
1179 #if defined(HAVE_KRB5_TKT_ENC_PART2)
1180 return tkt->enc_part2->times.authtime;
1181 #else
1182 return tkt->ticket.authtime;
1183 #endif
1184 }
1185
1186 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1187 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
1188 {
1189 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
1190 if (ap_req->ticket->enc_part.kvno)
1191 return ap_req->ticket->enc_part.kvno;
1192 #else /* Heimdal */
1193 if (ap_req->ticket.enc_part.kvno)
1194 return *ap_req->ticket.enc_part.kvno;
1195 #endif
1196 return 0;
1197 }
1198
1199 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
1200 {
1201 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
1202 return ap_req->ticket.enc_part.etype;
1203 #else /* MIT */
1204 return ap_req->ticket->enc_part.enctype;
1205 #endif
1206 }
1207 #endif /* HAVE_KRB5_DECODE_AP_REQ */
1208
1209 static krb5_error_code
1210 get_key_from_keytab(krb5_context context,
1211 krb5_const_principal server,
1212 krb5_enctype enctype,
1213 krb5_kvno kvno,
1214 krb5_keyblock **out_key)
1215 {
1216 krb5_keytab_entry entry;
1217 krb5_error_code ret;
1218 krb5_keytab keytab;
1219 char *name = NULL;
1220 krb5_keyblock *keyp;
1221
1222 /* We have to open a new keytab handle here, as MIT does
1223 an implicit open/getnext/close on krb5_kt_get_entry. We
1224 may be in the middle of a keytab enumeration when this is
1225 called. JRA. */
1226
1227 ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1228 if (ret) {
1229 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1230 return ret;
1231 }
1232
1233 if ( DEBUGLEVEL >= 10 ) {
1234 if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) {
1235 DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1236 kvno, enctype, name));
1237 TALLOC_FREE(name);
1238 }
1239 }
1240
1241 ret = krb5_kt_get_entry(context,
1242 keytab,
1243 server,
1244 kvno,
1245 enctype,
1246 &entry);
1247
1248 if (ret) {
1249 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1250 goto out;
1251 }
1252
1253 keyp = KRB5_KT_KEY(&entry);
1254
1255 ret = krb5_copy_keyblock(context, keyp, out_key);
1256 if (ret) {
1257 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1258 goto out;
1259 }
1260
1261 smb_krb5_kt_free_entry(context, &entry);
1262
1263 out:
1264 krb5_kt_close(context, keytab);
1265 return ret;
1266 }
1267
1268 /* Prototypes */
1269
1270 krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1271 const krb5_data *inbuf,
1272 krb5_kvno *kvno,
1273 krb5_enctype *enctype)
1274 {
1275 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1276 {
1277 krb5_error_code ret;
1278 krb5_ap_req ap_req;
1279
1280 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1281 if (ret)
1282 return ret;
1283
1284 *kvno = get_kvno_from_ap_req(&ap_req);
1285 *enctype = get_enctype_from_ap_req(&ap_req);
1286
1287 free_AP_REQ(&ap_req);
1288 return 0;
1289 }
1290 #endif
1291
1292 /* Possibly not an appropriate error code. */
1293 return KRB5KDC_ERR_BADOPTION;
1294 }
1295
1296 krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1297 krb5_auth_context *auth_context,
1298 const krb5_data *inbuf,
1299 krb5_const_principal server,
1300 krb5_keytab keytab,
1301 krb5_flags *ap_req_options,
1302 krb5_ticket **ticket,
1303 krb5_keyblock **keyblock)
1304 {
1305 krb5_error_code ret;
1306 krb5_kvno kvno;
1307 krb5_enctype enctype;
1308 krb5_keyblock *local_keyblock;
1309
1310 ret = krb5_rd_req(context,
1311 auth_context,
1312 inbuf,
1313 server,
1314 keytab,
1315 ap_req_options,
1316 ticket);
1317 if (ret) {
1318 return ret;
1319 }
1320
1321 #ifdef KRB5_TICKET_HAS_KEYINFO
1322 enctype = (*ticket)->enc_part.enctype;
1323 kvno = (*ticket)->enc_part.kvno;
1324 #else
1325 ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1326 if (ret) {
1327 return ret;
1328 }
1329 #endif
1330
1331 ret = get_key_from_keytab(context,
1332 server,
1333 enctype,
1334 kvno,
1335 &local_keyblock);
1336 if (ret) {
1337 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1338 goto out;
1339 }
1340
1341 out:
1342 if (ret && local_keyblock != NULL) {
1343 krb5_free_keyblock(context, local_keyblock);
1344 } else {
1345 *keyblock = local_keyblock;
1346 }
1347
1348 return ret;
1349 }
1350
1351 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1352 const char *name,
1353 krb5_principal *principal)
1354 {
1355 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1356 return smb_krb5_parse_name_norealm_conv(context, name, principal);
1357 #endif
1358
1359 /* we are cheating here because parse_name will in fact set the realm.
1360 * We don't care as the only caller of smb_krb5_parse_name_norealm
1361 * ignores the realm anyway when calling
1362 * smb_krb5_principal_compare_any_realm later - Guenther */
1363
1364 return smb_krb5_parse_name(context, name, principal);
1365 }
1366
1367 bool smb_krb5_principal_compare_any_realm(krb5_context context,
1368 krb5_const_principal princ1,
1369 krb5_const_principal princ2)
1370 {
1371 #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1372
1373 return krb5_principal_compare_any_realm(context, princ1, princ2);
1374
1375 /* krb5_princ_size is a macro in MIT */
1376 #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1377
1378 int i, len1, len2;
1379 const krb5_data *p1, *p2;
1380
1381 len1 = krb5_princ_size(context, princ1);
1382 len2 = krb5_princ_size(context, princ2);
1383
1384 if (len1 != len2)
1385 return False;
1386
1387 for (i = 0; i < len1; i++) {
1388
1389 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1390 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1391
1392 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1393 return False;
1394 }
1395
1396 return True;
1397 #else
1398 #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1399 #endif
1400 }
1401
1402 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, /* FILE:/tmp/krb5cc_0 */
1403 const char *client_string, /* gd@BER.SUSE.DE */
1404 const char *service_string, /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1405 time_t *expire_time)
1406 {
1407 krb5_error_code ret;
1408 krb5_context context = NULL;
1409 krb5_ccache ccache = NULL;
1410 krb5_principal client = NULL;
1411 krb5_creds creds, creds_in, *creds_out = NULL;
1412
1413 ZERO_STRUCT(creds);
1414 ZERO_STRUCT(creds_in);
1415
1416 initialize_krb5_error_table();
1417 ret = krb5_init_context(&context);
1418 if (ret) {
1419 goto done;
1420 }
1421
1422 if (!ccache_string) {
1423 ccache_string = krb5_cc_default_name(context);
1424 }
1425
1426 if (!ccache_string) {
1427 ret = EINVAL;
1428 goto done;
1429 }
1430
1431 DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1432
1433 /* FIXME: we should not fall back to defaults */
1434 ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1435 if (ret) {
1436 goto done;
1437 }
1438
1439 if (client_string) {
1440 ret = smb_krb5_parse_name(context, client_string, &client);
1441 if (ret) {
1442 goto done;
1443 }
1444 } else {
1445 ret = krb5_cc_get_principal(context, ccache, &client);
1446 if (ret) {
1447 goto done;
1448 }
1449 }
1450
1451 #ifdef HAVE_KRB5_GET_RENEWED_CREDS /* MIT */
1452 {
1453 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1454 if (ret) {
1455 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1456 goto done;
1457 }
1458 }
1459 #elif defined(HAVE_KRB5_GET_KDC_CRED) /* Heimdal */
1460 {
1461 krb5_kdc_flags flags;
1462 krb5_realm *client_realm = NULL;
1463
1464 ret = krb5_copy_principal(context, client, &creds_in.client);
1465 if (ret) {
1466 goto done;
1467 }
1468
1469 if (service_string) {
1470 ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1471 if (ret) {
1472 goto done;
1473 }
1474 } else {
1475 /* build tgt service by default */
1476 client_realm = krb5_princ_realm(context, creds_in.client);
1477 if (!client_realm) {
1478 ret = ENOMEM;
1479 goto done;
1480 }
1481 ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1482 if (ret) {
1483 goto done;
1484 }
1485 }
1486
1487 flags.i = 0;
1488 flags.b.renewable = flags.b.renew = True;
1489
1490 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1491 if (ret) {
1492 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1493 goto done;
1494 }
1495
1496 creds = *creds_out;
1497 }
1498 #else
1499 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1500 #endif
1501
1502 /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1503 ret = krb5_cc_initialize(context, ccache, client);
1504 if (ret) {
1505 goto done;
1506 }
1507
1508 ret = krb5_cc_store_cred(context, ccache, &creds);
1509
1510 if (expire_time) {
1511 *expire_time = (time_t) creds.times.endtime;
1512 }
1513
1514 done:
1515 krb5_free_cred_contents(context, &creds_in);
1516
1517 if (creds_out) {
1518 krb5_free_creds(context, creds_out);
1519 } else {
1520 krb5_free_cred_contents(context, &creds);
1521 }
1522
1523 if (client) {
1524 krb5_free_principal(context, client);
1525 }
1526 if (ccache) {
1527 krb5_cc_close(context, ccache);
1528 }
1529 if (context) {
1530 krb5_free_context(context);
1531 }
1532
1533 return ret;
1534 }
1535
1536 krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1537 {
1538 krb5_error_code ret = 0;
1539 if (addr == NULL) {
1540 return ret;
1541 }
1542 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1543 krb5_free_addresses(context, addr->addrs);
1544 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1545 ret = krb5_free_addresses(context, addr->addrs);
1546 SAFE_FREE(addr->addrs);
1547 #endif
1548 SAFE_FREE(addr);
1549 addr = NULL;
1550 return ret;
1551 }
1552
1553 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1554 {
1555 krb5_error_code ret = 0;
1556 nstring buf;
1557 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1558 krb5_address **addrs = NULL;
1559 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1560 krb5_addresses *addrs = NULL;
1561 #endif
1562
1563 *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1564 if (*kerb_addr == NULL) {
1565 return ENOMEM;
1566 }
1567
1568 put_name(buf, global_myname(), ' ', 0x20);
1569
1570 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1571 {
1572 int num_addr = 2;
1573
1574 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1575 if (addrs == NULL) {
1576 SAFE_FREE(*kerb_addr);
1577 return ENOMEM;
1578 }
1579
1580 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1581
1582 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1583 if (addrs[0] == NULL) {
1584 SAFE_FREE(addrs);
1585 SAFE_FREE(*kerb_addr);
1586 return ENOMEM;
1587 }
1588
1589 addrs[0]->magic = KV5M_ADDRESS;
1590 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1591 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1592 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1593 if (addrs[0]->contents == NULL) {
1594 SAFE_FREE(addrs[0]);
1595 SAFE_FREE(addrs);
1596 SAFE_FREE(*kerb_addr);
1597 return ENOMEM;
1598 }
1599
1600 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1601
1602 addrs[1] = NULL;
1603 }
1604 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1605 {
1606 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1607 if (addrs == NULL) {
1608 SAFE_FREE(*kerb_addr);
1609 return ENOMEM;
1610 }
1611
1612 memset(addrs, 0, sizeof(krb5_addresses));
1613
1614 addrs->len = 1;
1615 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1616 if (addrs->val == NULL) {
1617 SAFE_FREE(addrs);
1618 SAFE_FREE(kerb_addr);
1619 return ENOMEM;
1620 }
1621
1622 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1623 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1624 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1625 if (addrs->val[0].address.data == NULL) {
1626 SAFE_FREE(addrs->val);
1627 SAFE_FREE(addrs);
1628 SAFE_FREE(*kerb_addr);
1629 return ENOMEM;
1630 }
1631
1632 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1633 }
1634 #else
1635 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1636 #endif
1637 (*kerb_addr)->addrs = addrs;
1638
1639 return ret;
1640 }
1641
1642 void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1643 {
1644 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1645 krb5_free_error_contents(context, krberror);
1646 #else /* MIT */
1647 krb5_free_error(context, krberror);
1648 #endif
1649 }
1650
1651 krb5_error_code handle_krberror_packet(krb5_context context,
1652 krb5_data *packet)
1653 {
1654 krb5_error_code ret;
1655 bool got_error_code = False;
1656
1657 DEBUG(10,("handle_krberror_packet: got error packet\n"));
1658
1659 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
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 == NULL || krberror.e_data->data == NULL) {
1670 ret = (krb5_error_code) krberror.error_code;
1671 got_error_code = True;
1672 }
1673
1674 smb_krb5_free_error(context, &krberror);
1675 }
1676 #else /* MIT */
1677 {
1678 krb5_error *krberror;
1679
1680 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1681 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1682 error_message(ret)));
1683 return ret;
1684 }
1685
1686 if (krberror->e_data.data == NULL) {
1687 #if defined(ERROR_TABLE_BASE_krb5)
1688 ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1689 #else
1690 ret = (krb5_error_code)krberror->error;
1691 #endif
1692 got_error_code = True;
1693 }
1694 smb_krb5_free_error(context, krberror);
1695 }
1696 #endif
1697 if (got_error_code) {
1698 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1699 error_message(ret), ret));
1700 }
1701 return ret;
1702 }
1703
1704 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1705 krb5_get_init_creds_opt **opt)
1706 {
1707 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1708 /* Heimdal or modern MIT version */
1709 return krb5_get_init_creds_opt_alloc(context, opt);
1710 #else
1711 /* Historical MIT version */
1712 krb5_get_init_creds_opt *my_opt;
1713
1714 *opt = NULL;
1715
1716 if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1717 return ENOMEM;
1718 }
1719
1720 krb5_get_init_creds_opt_init(my_opt);
1721
1722 *opt = my_opt;
1723 return 0;
1724 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC */
1725 }
1726
1727 void smb_krb5_get_init_creds_opt_free(krb5_context context,
1728 krb5_get_init_creds_opt *opt)
1729 {
1730 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1731
1732 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1733 /* Modern MIT or Heimdal version */
1734 krb5_get_init_creds_opt_free(context, opt);
1735 #else
1736 /* Heimdal version */
1737 krb5_get_init_creds_opt_free(opt);
1738 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1739
1740 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1741 /* Historical MIT version */
1742 SAFE_FREE(opt);
1743 opt = NULL;
1744 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1745 }
1746
1747 krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1748 {
1749 return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1750 }
1751
1752
1753 /* caller needs to free etype_s */
1754 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1755 krb5_enctype enctype,
1756 char **etype_s)
1757 {
1758 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1759 return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1760 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1761 char buf[256];
1762 krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1763 if (ret) {
1764 return ret;
1765 }
1766 *etype_s = SMB_STRDUP(buf);
1767 if (!*etype_s) {
1768 return ENOMEM;
1769 }
1770 return ret;
1771 #else
1772 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1773 #endif
1774 }
1775
1776 krb5_error_code smb_krb5_mk_error(krb5_context context,
1777 krb5_error_code error_code,
1778 const krb5_principal server,
1779 krb5_data *reply)
1780 {
1781 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1782 /*
1783 * The MIT interface is *terrible*.
1784 * We have to construct this ourselves...
1785 */
1786 krb5_error e;
1787
1788 memset(&e, 0, sizeof(e));
1789 krb5_us_timeofday(context, &e.stime, &e.susec);
1790 e.server = server;
1791 #if defined(krb5_err_base)
1792 e.error = error_code - krb5_err_base;
1793 #elif defined(ERROR_TABLE_BASE_krb5)
1794 e.error = error_code - ERROR_TABLE_BASE_krb5;
1795 #else
1796 e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1797 #endif
1798
1799 return krb5_mk_error(context, &e, reply);
1800 #else /* Heimdal. */
1801 return krb5_mk_error(context,
1802 error_code,
1803 NULL,
1804 NULL, /* e_data */
1805 NULL,
1806 server,
1807 NULL,
1808 NULL,
1809 reply);
1810 #endif
1811 }
1812
1813 /**********************************************************************
1814 * Open a krb5 keytab with flags, handles readonly or readwrite access and
1815 * allows to process non-default keytab names.
1816 * @param context krb5_context
1817 * @param keytab_name_req string
1818 * @param write_access bool if writable keytab is required
1819 * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1820 * @return krb5_error_code
1821 **********************************************************************/
1822
1823 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1824 #ifndef MAX_KEYTAB_NAME_LEN
1825 #define MAX_KEYTAB_NAME_LEN 1100
1826 #endif
1827
1828 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1829 const char *keytab_name_req,
1830 bool write_access,
1831 krb5_keytab *keytab)
1832 {
1833 krb5_error_code ret = 0;
1834 TALLOC_CTX *mem_ctx;
1835 char keytab_string[MAX_KEYTAB_NAME_LEN];
1836 char *kt_str = NULL;
1837 bool found_valid_name = False;
1838 const char *pragma = "FILE";
1839 const char *tmp = NULL;
1840
1841 if (!write_access && !keytab_name_req) {
1842 /* caller just wants to read the default keytab readonly, so be it */
1843 return krb5_kt_default(context, keytab);
1844 }
1845
1846 mem_ctx = talloc_init("smb_krb5_open_keytab");
1847 if (!mem_ctx) {
1848 return ENOMEM;
1849 }
1850
1851 #ifdef HAVE_WRFILE_KEYTAB
1852 if (write_access) {
1853 pragma = "WRFILE";
1854 }
1855 #endif
1856
1857 if (keytab_name_req) {
1858
1859 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1860 ret = KRB5_CONFIG_NOTENUFSPACE;
1861 goto out;
1862 }
1863
1864 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1865 (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1866 tmp = keytab_name_req;
1867 goto resolve;
1868 }
1869
1870 if (keytab_name_req[0] != '/') {
1871 ret = KRB5_KT_BADNAME;
1872 goto out;
1873 }
1874
1875 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1876 if (!tmp) {
1877 ret = ENOMEM;
1878 goto out;
1879 }
1880
1881 goto resolve;
1882 }
1883
1884 /* we need to handle more complex keytab_strings, like:
1885 * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1886
1887 ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1888 if (ret) {
1889 goto out;
1890 }
1891
1892 DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1893
1894 tmp = talloc_strdup(mem_ctx, keytab_string);
1895 if (!tmp) {
1896 ret = ENOMEM;
1897 goto out;
1898 }
1899
1900 if (strncmp(tmp, "ANY:", 4) == 0) {
1901 tmp += 4;
1902 }
1903
1904 memset(&keytab_string, '\0', sizeof(keytab_string));
1905
1906 while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1907 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1908 found_valid_name = True;
1909 tmp = kt_str;
1910 tmp += 7;
1911 }
1912
1913 if (strncmp(kt_str, "FILE:", 5) == 0) {
1914 found_valid_name = True;
1915 tmp = kt_str;
1916 tmp += 5;
1917 }
1918
1919 if (tmp[0] == '/') {
1920 /* Treat as a FILE: keytab definition. */
1921 found_valid_name = true;
1922 }
1923
1924 if (found_valid_name) {
1925 if (tmp[0] != '/') {
1926 ret = KRB5_KT_BADNAME;
1927 goto out;
1928 }
1929
1930 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1931 if (!tmp) {
1932 ret = ENOMEM;
1933 goto out;
1934 }
1935 break;
1936 }
1937 }
1938
1939 if (!found_valid_name) {
1940 ret = KRB5_KT_UNKNOWN_TYPE;
1941 goto out;
1942 }
1943
1944 resolve:
1945 DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1946 ret = krb5_kt_resolve(context, tmp, keytab);
1947
1948 out:
1949 TALLOC_FREE(mem_ctx);
1950 return ret;
1951 }
1952
1953 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1954 krb5_context context,
1955 krb5_keytab keytab,
1956 const char **keytab_name)
1957 {
1958 char keytab_string[MAX_KEYTAB_NAME_LEN];
1959 krb5_error_code ret = 0;
1960
1961 ret = krb5_kt_get_name(context, keytab,
1962 keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1963 if (ret) {
1964 return ret;
1965 }
1966
1967 *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1968 if (!*keytab_name) {
1969 return ENOMEM;
1970 }
1971
1972 return ret;
1973 }
1974
1975 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1976 defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1977 defined(HAVE_KRB5_GET_CREDS)
1978 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1979 krb5_ccache ccache,
1980 krb5_principal me,
1981 krb5_principal server,
1982 krb5_principal impersonate_princ,
1983 krb5_creds **out_creds)
1984 {
1985 krb5_error_code ret;
1986 krb5_get_creds_opt opt;
1987
1988 ret = krb5_get_creds_opt_alloc(context, &opt);
1989 if (ret) {
1990 goto done;
1991 }
1992 krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1993
1994 if (impersonate_princ) {
1995 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1996 impersonate_princ);
1997 if (ret) {
1998 goto done;
1999 }
2000 }
2001
2002 ret = krb5_get_creds(context, opt, ccache, server, out_creds);
2003 if (ret) {
2004 goto done;
2005 }
2006
2007 done:
2008 if (opt) {
2009 krb5_get_creds_opt_free(context, opt);
2010 }
2011 return ret;
2012 }
2013 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
2014
2015 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
2016 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
2017 krb5_ccache ccache,
2018 krb5_principal me,
2019 krb5_principal server,
2020 krb5_principal impersonate_princ,
2021 krb5_creds **out_creds)
2022 {
2023 krb5_error_code ret;
2024 krb5_creds in_creds;
2025
2026 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
2027 krb5_error_code KRB5_CALLCONV
2028 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
2029 krb5_ccache ccache, krb5_creds *in_creds,
2030 krb5_data *subject_cert,
2031 krb5_creds **out_creds);
2032 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
2033
2034 ZERO_STRUCT(in_creds);
2035
2036 if (impersonate_princ) {
2037
2038 in_creds.server = me;
2039 in_creds.client = impersonate_princ;
2040
2041 ret = krb5_get_credentials_for_user(context,
2042 0, /* krb5_flags options */
2043 ccache,
2044 &in_creds,
2045 NULL, /* krb5_data *subject_cert */
2046 out_creds);
2047 } else {
2048 in_creds.client = me;
2049 in_creds.server = server;
2050
2051 ret = krb5_get_credentials(context, 0, ccache,
2052 &in_creds, out_creds);
2053 }
2054
2055 return ret;
2056 }
2057 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
2058
2059 /*
2060 * smb_krb5_get_credentials
2061 *
2062 * @brief Get krb5 credentials for a server
2063 *
2064 * @param[in] context An initialized krb5_context
2065 * @param[in] ccache An initialized krb5_ccache
2066 * @param[in] me The krb5_principal of the caller
2067 * @param[in] server The krb5_principal of the requested service
2068 * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
2069 * @param[out] out_creds The returned krb5_creds structure
2070 * @return krb5_error_code
2071 *
2072 */
2073 krb5_error_code smb_krb5_get_credentials(krb5_context context,
2074 krb5_ccache ccache,
2075 krb5_principal me,
2076 krb5_principal server,
2077 krb5_principal impersonate_princ,
2078 krb5_creds **out_creds)
2079 {
2080 krb5_error_code ret;
2081 krb5_creds *creds = NULL;
2082
2083 *out_creds = NULL;
2084
2085 if (impersonate_princ) {
2086 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
2087 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
2088 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
2089 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
2090 #else
2091 ret = ENOTSUP;
2092 #endif
2093 } else {
2094 krb5_creds in_creds;
2095
2096 ZERO_STRUCT(in_creds);
2097
2098 in_creds.client = me;
2099 in_creds.server = server;
2100
2101 ret = krb5_get_credentials(context, 0, ccache,
2102 &in_creds, &creds);
2103 }
2104 if (ret) {
2105 goto done;
2106 }
2107
2108 ret = krb5_cc_store_cred(context, ccache, creds);
2109 if (ret) {
2110 goto done;
2111 }
2112
2113 if (out_creds) {
2114 *out_creds = creds;
2115 }
2116
2117 done:
2118 if (creds && ret) {
2119 krb5_free_creds(context, creds);
2120 }
2121
2122 return ret;
2123 }
2124
2125 /*
2126 * smb_krb5_get_creds
2127 *
2128 * @brief Get krb5 credentials for a server
2129 *
2130 * @param[in] server_s The string name of the service
2131 * @param[in] time_offset The offset to the KDCs time in seconds (optional)
2132 * @param[in] cc The krb5 credential cache string name (optional)
2133 * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
2134 * @param[out] creds_p The returned krb5_creds structure
2135 * @return krb5_error_code
2136 *
2137 */
2138 krb5_error_code smb_krb5_get_creds(const char *server_s,
2139 time_t time_offset,
2140 const char *cc,
2141 const char *impersonate_princ_s,
2142 krb5_creds **creds_p)
2143 {
2144 krb5_error_code ret;
2145 krb5_context context = NULL;
2146 krb5_principal me = NULL;
2147 krb5_principal server = NULL;
2148 krb5_principal impersonate_princ = NULL;
2149 krb5_creds *creds = NULL;
2150 krb5_ccache ccache = NULL;
2151
2152 *creds_p = NULL;
2153
2154 initialize_krb5_error_table();
2155 ret = krb5_init_context(&context);
2156 if (ret) {
2157 goto done;
2158 }
2159
2160 if (time_offset != 0) {
2161 krb5_set_real_time(context, time(NULL) + time_offset, 0);
2162 }
2163
2164 ret = krb5_cc_resolve(context, cc ? cc :
2165 krb5_cc_default_name(context), &ccache);
2166 if (ret) {
2167 goto done;
2168 }
2169
2170 ret = krb5_cc_get_principal(context, ccache, &me);
2171 if (ret) {
2172 goto done;
2173 }
2174
2175 ret = smb_krb5_parse_name(context, server_s, &server);
2176 if (ret) {
2177 goto done;
2178 }
2179
2180 if (impersonate_princ_s) {
2181 ret = smb_krb5_parse_name(context, impersonate_princ_s,
2182 &impersonate_princ);
2183 if (ret) {
2184 goto done;
2185 }
2186 }
2187
2188 ret = smb_krb5_get_credentials(context, ccache,
2189 me, server, impersonate_princ,
2190 &creds);
2191 if (ret) {
2192 goto done;
2193 }
2194
2195 ret = krb5_cc_store_cred(context, ccache, creds);
2196 if (ret) {
2197 goto done;
2198 }
2199
2200 if (creds_p) {
2201 *creds_p = creds;
2202 }
2203
2204 DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
2205 server_s));
2206
2207 if (impersonate_princ_s) {
2208 char *client = NULL;
2209
2210 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
2211 if (ret) {
2212 goto done;
2213 }
2214 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
2215 client));
2216 TALLOC_FREE(client);
2217 }
2218
2219 done:
2220 if (!context) {
2221 return ret;
2222 }
2223
2224 if (creds && ret) {
2225 krb5_free_creds(context, creds);
2226 }
2227 if (server) {
2228 krb5_free_principal(context, server);
2229 }
2230 if (me) {
2231 krb5_free_principal(context, me);
2232 }
2233 if (impersonate_princ) {
2234 krb5_free_principal(context, impersonate_princ);
2235 }
2236 if (ccache) {
2237 krb5_cc_close(context, ccache);
2238 }
2239 krb5_free_context(context);
2240
2241 return ret;
2242 }
2243
2244 /*
2245 * smb_krb5_principal_get_realm
2246 *
2247 * @brief Get realm of a principal
2248 *
2249 * @param[in] context The krb5_context
2250 * @param[in] principal The principal
2251 * @return pointer to the realm
2252 *
2253 */
2254
2255 char *smb_krb5_principal_get_realm(krb5_context context,
2256 krb5_principal principal)
2257 {
2258 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2259 return krb5_principal_get_realm(context, principal);
2260 #elif defined(krb5_princ_realm) /* MIT */
2261 krb5_data *realm;
2262 realm = krb5_princ_realm(context, principal);
2263 return (char *)realm->data;
2264 #else
2265 return NULL;
2266 #endif
2267 }
2268
2269 #else /* HAVE_KRB5 */
2270 /* this saves a few linking headaches */
2271 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
2272 const char *principal, time_t time_offset,
2273 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
2274 uint32_t extra_ap_opts,
2275 const char *ccname, time_t *tgs_expire,
2276 const char *impersonate_princ_s)
2277 {
2278 DEBUG(0,("NO KERBEROS SUPPORT\n"));
2279 return 1;
2280 }
2281
2282 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
2283 {
2284 DEBUG(0,("NO KERBEROS SUPPORT\n"));
2285 return false;
2286 }
2287
2288 #endif /* HAVE_KRB5 */