source: vendor/3.5.7/source3/libsmb/clikrb5.c

Last change on this file was 587, checked in by Herwig Bauernfeind, 14 years ago

Samba 3.5: Update vendor to version 3.5.6
File size: 60.1 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 simple kerberos5 routines for active directory
4 Copyright (C) Andrew Tridgell 2001
5 Copyright (C) Luke Howard 2002-2003
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
7 Copyright (C) Guenther Deschner 2005-2009
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
21*/
22
23#include "includes.h"
24#include "smb_krb5.h"
25#include "authdata.h"
26
27#ifdef HAVE_KRB5
28
29#define GSSAPI_CHECKSUM 0x8003 /* Checksum type value for Kerberos */
30#define GSSAPI_BNDLENGTH 16 /* Bind Length (rfc-1964 pg.3) */
31#define GSSAPI_CHECKSUM_SIZE (4+GSSAPI_BNDLENGTH+4) /* Length of bind length,
32 bind field, flags field. */
33
34/* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
35 but still has the symbol */
36#if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
37krb5_error_code krb5_auth_con_set_req_cksumtype(
38 krb5_context context,
39 krb5_auth_context auth_context,
40 krb5_cksumtype cksumtype);
41#endif
42
43/**************************************************************
44 Wrappers around kerberos string functions that convert from
45 utf8 -> unix charset and vica versa.
46**************************************************************/
47
48/**************************************************************
49 krb5_parse_name that takes a UNIX charset.
50**************************************************************/
51
52 krb5_error_code smb_krb5_parse_name(krb5_context context,
53 const char *name, /* in unix charset */
54 krb5_principal *principal)
55{
56 krb5_error_code ret;
57 char *utf8_name;
58 size_t converted_size;
59
60 if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
61 return ENOMEM;
62 }
63
64 ret = krb5_parse_name(context, utf8_name, principal);
65 TALLOC_FREE(utf8_name);
66 return ret;
67}
68
69#ifdef HAVE_KRB5_PARSE_NAME_NOREALM
70/**************************************************************
71 krb5_parse_name_norealm that takes a UNIX charset.
72**************************************************************/
73
74static krb5_error_code smb_krb5_parse_name_norealm_conv(krb5_context context,
75 const char *name, /* in unix charset */
76 krb5_principal *principal)
77{
78 krb5_error_code ret;
79 char *utf8_name;
80 size_t converted_size;
81
82 *principal = NULL;
83 if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
84 return ENOMEM;
85 }
86
87 ret = krb5_parse_name_norealm(context, utf8_name, principal);
88 TALLOC_FREE(utf8_name);
89 return ret;
90}
91#endif
92
93/**************************************************************
94 krb5_parse_name that returns a UNIX charset name. Must
95 be freed with talloc_free() call.
96**************************************************************/
97
98krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
99 krb5_context context,
100 krb5_const_principal principal,
101 char **unix_name)
102{
103 krb5_error_code ret;
104 char *utf8_name;
105 size_t converted_size;
106
107 *unix_name = NULL;
108 ret = krb5_unparse_name(context, principal, &utf8_name);
109 if (ret) {
110 return ret;
111 }
112
113 if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
114 krb5_free_unparsed_name(context, utf8_name);
115 return ENOMEM;
116 }
117 krb5_free_unparsed_name(context, utf8_name);
118 return 0;
119}
120
121#ifndef HAVE_KRB5_SET_REAL_TIME
122/*
123 * This function is not in the Heimdal mainline.
124 */
125 krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds)
126{
127 krb5_error_code ret;
128 int32_t sec, usec;
129
130 ret = krb5_us_timeofday(context, &sec, &usec);
131 if (ret)
132 return ret;
133
134 context->kdc_sec_offset = seconds - sec;
135 context->kdc_usec_offset = microseconds - usec;
136
137 return 0;
138}
139#endif
140
141#if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
142
143#if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
144
145/* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
146 * to krb5_set_default_tgs_ktypes. See
147 * http://lists.samba.org/archive/samba-technical/2006-July/048271.html
148 *
149 * If the MIT libraries are not exporting internal symbols, we will end up in
150 * this branch, which is correct. Otherwise we will continue to use the
151 * internal symbol
152 */
153 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
154{
155 return krb5_set_default_tgs_enctypes(ctx, enc);
156}
157
158#elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
159
160/* Heimdal */
161 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
162{
163 return krb5_set_default_in_tkt_etypes(ctx, enc);
164}
165
166#endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
167
168#endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
169
170#if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
171/* HEIMDAL */
172 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
173{
174 memset(pkaddr, '\0', sizeof(krb5_address));
175#if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
176 if (paddr->ss_family == AF_INET6) {
177 pkaddr->addr_type = KRB5_ADDRESS_INET6;
178 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
179 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
180 return true;
181 }
182#endif
183 if (paddr->ss_family == AF_INET) {
184 pkaddr->addr_type = KRB5_ADDRESS_INET;
185 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
186 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
187 return true;
188 }
189 return false;
190}
191#elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
192/* MIT */
193 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
194{
195 memset(pkaddr, '\0', sizeof(krb5_address));
196#if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
197 if (paddr->ss_family == AF_INET6) {
198 pkaddr->addrtype = ADDRTYPE_INET6;
199 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
200 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
201 return true;
202 }
203#endif
204 if (paddr->ss_family == AF_INET) {
205 pkaddr->addrtype = ADDRTYPE_INET;
206 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
207 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
208 return true;
209 }
210 return false;
211}
212#else
213#error UNKNOWN_ADDRTYPE
214#endif
215
216#if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY) && defined(HAVE_KRB5_ENCRYPT_BLOCK)
217static int create_kerberos_key_from_string_direct(krb5_context context,
218 krb5_principal host_princ,
219 krb5_data *password,
220 krb5_keyblock *key,
221 krb5_enctype enctype)
222{
223 int ret = 0;
224 krb5_data salt;
225 krb5_encrypt_block eblock;
226
227 ret = krb5_principal2salt(context, host_princ, &salt);
228 if (ret) {
229 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
230 return ret;
231 }
232 krb5_use_enctype(context, &eblock, enctype);
233 ret = krb5_string_to_key(context, &eblock, key, password, &salt);
234 SAFE_FREE(salt.data);
235
236 return ret;
237}
238#elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
239static int create_kerberos_key_from_string_direct(krb5_context context,
240 krb5_principal host_princ,
241 krb5_data *password,
242 krb5_keyblock *key,
243 krb5_enctype enctype)
244{
245 int ret;
246 krb5_salt salt;
247
248 ret = krb5_get_pw_salt(context, host_princ, &salt);
249 if (ret) {
250 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
251 return ret;
252 }
253
254 ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
255 krb5_free_salt(context, salt);
256
257 return ret;
258}
259#else
260#error UNKNOWN_CREATE_KEY_FUNCTIONS
261#endif
262
263 int create_kerberos_key_from_string(krb5_context context,
264 krb5_principal host_princ,
265 krb5_data *password,
266 krb5_keyblock *key,
267 krb5_enctype enctype,
268 bool no_salt)
269{
270 krb5_principal salt_princ = NULL;
271 int ret;
272 /*
273 * Check if we've determined that the KDC is salting keys for this
274 * principal/enctype in a non-obvious way. If it is, try to match
275 * its behavior.
276 */
277 if (no_salt) {
278 KRB5_KEY_DATA(key) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
279 if (!KRB5_KEY_DATA(key)) {
280 return ENOMEM;
281 }
282 memcpy(KRB5_KEY_DATA(key), password->data, password->length);
283 KRB5_KEY_LENGTH(key) = password->length;
284 KRB5_KEY_TYPE(key) = enctype;
285 return 0;
286 }
287 salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype);
288 ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype);
289 if (salt_princ) {
290 krb5_free_principal(context, salt_princ);
291 }
292 return ret;
293}
294
295#if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
296 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
297 krb5_enctype **enctypes)
298{
299 return krb5_get_permitted_enctypes(context, enctypes);
300}
301#elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
302 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
303 krb5_enctype **enctypes)
304{
305 return krb5_get_default_in_tkt_etypes(context, enctypes);
306}
307#else
308#error UNKNOWN_GET_ENCTYPES_FUNCTIONS
309#endif
310
311#if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
312 krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
313 krb5_auth_context auth_context,
314 krb5_keyblock *keyblock)
315{
316 return krb5_auth_con_setkey(context, auth_context, keyblock);
317}
318#endif
319
320bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
321 DATA_BLOB *edata,
322 DATA_BLOB *edata_out)
323{
324 DATA_BLOB edata_contents;
325 ASN1_DATA *data;
326 int edata_type;
327
328 if (!edata->length) {
329 return False;
330 }
331
332 data = asn1_init(mem_ctx);
333 if (data == NULL) {
334 return false;
335 }
336
337 asn1_load(data, *edata);
338 asn1_start_tag(data, ASN1_SEQUENCE(0));
339 asn1_start_tag(data, ASN1_CONTEXT(1));
340 asn1_read_Integer(data, &edata_type);
341
342 if (edata_type != KRB5_PADATA_PW_SALT) {
343 DEBUG(0,("edata is not of required type %d but of type %d\n",
344 KRB5_PADATA_PW_SALT, edata_type));
345 asn1_free(data);
346 return False;
347 }
348
349 asn1_start_tag(data, ASN1_CONTEXT(2));
350 asn1_read_OctetString(data, talloc_autofree_context(), &edata_contents);
351 asn1_end_tag(data);
352 asn1_end_tag(data);
353 asn1_end_tag(data);
354 asn1_free(data);
355
356 *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
357
358 data_blob_free(&edata_contents);
359
360 return True;
361}
362
363
364bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
365{
366 DATA_BLOB pac_contents;
367 ASN1_DATA *data;
368 int data_type;
369
370 if (!auth_data->length) {
371 return False;
372 }
373
374 data = asn1_init(mem_ctx);
375 if (data == NULL) {
376 return false;
377 }
378
379 asn1_load(data, *auth_data);
380 asn1_start_tag(data, ASN1_SEQUENCE(0));
381 asn1_start_tag(data, ASN1_SEQUENCE(0));
382 asn1_start_tag(data, ASN1_CONTEXT(0));
383 asn1_read_Integer(data, &data_type);
384
385 if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) {
386 DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type));
387 asn1_free(data);
388 return False;
389 }
390
391 asn1_end_tag(data);
392 asn1_start_tag(data, ASN1_CONTEXT(1));
393 asn1_read_OctetString(data, talloc_autofree_context(), &pac_contents);
394 asn1_end_tag(data);
395 asn1_end_tag(data);
396 asn1_end_tag(data);
397 asn1_free(data);
398
399 *unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length);
400
401 data_blob_free(&pac_contents);
402
403 return True;
404}
405
406 bool get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt)
407{
408 DATA_BLOB auth_data_wrapped;
409 bool got_auth_data_pac = False;
410 int i;
411
412#if defined(HAVE_KRB5_TKT_ENC_PART2)
413 if (tkt->enc_part2 && tkt->enc_part2->authorization_data &&
414 tkt->enc_part2->authorization_data[0] &&
415 tkt->enc_part2->authorization_data[0]->length)
416 {
417 for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) {
418
419 if (tkt->enc_part2->authorization_data[i]->ad_type !=
420 KRB5_AUTHDATA_IF_RELEVANT) {
421 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
422 tkt->enc_part2->authorization_data[i]->ad_type));
423 continue;
424 }
425
426 auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents,
427 tkt->enc_part2->authorization_data[i]->length);
428
429 /* check if it is a PAC */
430 got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
431 data_blob_free(&auth_data_wrapped);
432
433 if (got_auth_data_pac) {
434 return true;
435 }
436 }
437
438 return got_auth_data_pac;
439 }
440
441#else
442 if (tkt->ticket.authorization_data &&
443 tkt->ticket.authorization_data->len)
444 {
445 for (i = 0; i < tkt->ticket.authorization_data->len; i++) {
446
447 if (tkt->ticket.authorization_data->val[i].ad_type !=
448 KRB5_AUTHDATA_IF_RELEVANT) {
449 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
450 tkt->ticket.authorization_data->val[i].ad_type));
451 continue;
452 }
453
454 auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data,
455 tkt->ticket.authorization_data->val[i].ad_data.length);
456
457 /* check if it is a PAC */
458 got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
459 data_blob_free(&auth_data_wrapped);
460
461 if (got_auth_data_pac) {
462 return true;
463 }
464 }
465
466 return got_auth_data_pac;
467 }
468#endif
469 return False;
470}
471
472 krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
473{
474#if defined(HAVE_KRB5_TKT_ENC_PART2)
475 return tkt->enc_part2->client;
476#else
477 return tkt->client;
478#endif
479}
480
481#if !defined(HAVE_KRB5_LOCATE_KDC)
482
483/* krb5_locate_kdc is an internal MIT symbol. MIT are not yet willing to commit
484 * to a public interface for this functionality, so we have to be able to live
485 * without it if the MIT libraries are hiding their internal symbols.
486 */
487
488#if defined(KRB5_KRBHST_INIT)
489/* Heimdal */
490 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters)
491{
492 krb5_krbhst_handle hnd;
493 krb5_krbhst_info *hinfo;
494 krb5_error_code rc;
495 int num_kdcs, i;
496 struct sockaddr *sa;
497 struct addrinfo *ai;
498
499 *addr_pp = NULL;
500 *naddrs = 0;
501
502 rc = krb5_krbhst_init(ctx, realm->data, KRB5_KRBHST_KDC, &hnd);
503 if (rc) {
504 DEBUG(0, ("smb_krb5_locate_kdc: krb5_krbhst_init failed (%s)\n", error_message(rc)));
505 return rc;
506 }
507
508 for ( num_kdcs = 0; (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); num_kdcs++)
509 ;
510
511 krb5_krbhst_reset(ctx, hnd);
512
513 if (!num_kdcs) {
514 DEBUG(0, ("smb_krb5_locate_kdc: zero kdcs found !\n"));
515 krb5_krbhst_free(ctx, hnd);
516 return -1;
517 }
518
519 sa = SMB_MALLOC_ARRAY( struct sockaddr, num_kdcs );
520 if (!sa) {
521 DEBUG(0, ("smb_krb5_locate_kdc: malloc failed\n"));
522 krb5_krbhst_free(ctx, hnd);
523 naddrs = 0;
524 return -1;
525 }
526
527 memset(sa, '\0', sizeof(struct sockaddr) * num_kdcs );
528
529 for (i = 0; i < num_kdcs && (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); i++) {
530
531#if defined(HAVE_KRB5_KRBHST_GET_ADDRINFO)
532 rc = krb5_krbhst_get_addrinfo(ctx, hinfo, &ai);
533 if (rc) {
534 DEBUG(0,("krb5_krbhst_get_addrinfo failed: %s\n", error_message(rc)));
535 continue;
536 }
537#endif
538 if (hinfo->ai && hinfo->ai->ai_family == AF_INET)
539 memcpy(&sa[i], hinfo->ai->ai_addr, sizeof(struct sockaddr));
540 }
541
542 krb5_krbhst_free(ctx, hnd);
543
544 *naddrs = num_kdcs;
545 *addr_pp = sa;
546 return 0;
547}
548
549#else /* ! defined(KRB5_KRBHST_INIT) */
550
551 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
552 struct sockaddr **addr_pp, int *naddrs, int get_masters)
553{
554 DEBUG(0, ("unable to explicitly locate the KDC on this platform\n"));
555 return KRB5_KDC_UNREACH;
556}
557
558#endif /* KRB5_KRBHST_INIT */
559
560#else /* ! HAVE_KRB5_LOCATE_KDC */
561
562 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
563 struct sockaddr **addr_pp, int *naddrs, int get_masters)
564{
565 return krb5_locate_kdc(ctx, realm, addr_pp, naddrs, get_masters);
566}
567
568#endif /* HAVE_KRB5_LOCATE_KDC */
569
570#if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
571 void krb5_free_unparsed_name(krb5_context context, char *val)
572{
573 SAFE_FREE(val);
574}
575#endif
576
577 void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
578{
579#if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
580 if (pdata->data) {
581 krb5_free_data_contents(context, pdata);
582 }
583#else
584 SAFE_FREE(pdata->data);
585#endif
586}
587
588 void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype)
589{
590#if defined(HAVE_KRB5_KEYBLOCK_IN_CREDS)
591 KRB5_KEY_TYPE((&pcreds->keyblock)) = enctype;
592#elif defined(HAVE_KRB5_SESSION_IN_CREDS)
593 KRB5_KEY_TYPE((&pcreds->session)) = enctype;
594#else
595#error UNKNOWN_KEYBLOCK_MEMBER_IN_KRB5_CREDS_STRUCT
596#endif
597}
598
599 bool kerberos_compatible_enctypes(krb5_context context,
600 krb5_enctype enctype1,
601 krb5_enctype enctype2)
602{
603#if defined(HAVE_KRB5_C_ENCTYPE_COMPARE)
604 krb5_boolean similar = 0;
605
606 krb5_c_enctype_compare(context, enctype1, enctype2, &similar);
607 return similar ? True : False;
608#elif defined(HAVE_KRB5_ENCTYPES_COMPATIBLE_KEYS)
609 return krb5_enctypes_compatible_keys(context, enctype1, enctype2) ? True : False;
610#endif
611}
612
613static bool ads_cleanup_expired_creds(krb5_context context,
614 krb5_ccache ccache,
615 krb5_creds *credsp)
616{
617 krb5_error_code retval;
618 const char *cc_type = krb5_cc_get_type(context, ccache);
619
620 DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
621 cc_type, krb5_cc_get_name(context, ccache),
622 http_timestring(talloc_tos(), credsp->times.endtime)));
623
624 /* we will probably need new tickets if the current ones
625 will expire within 10 seconds.
626 */
627 if (credsp->times.endtime >= (time(NULL) + 10))
628 return False;
629
630 /* heimdal won't remove creds from a file ccache, and
631 perhaps we shouldn't anyway, since internally we
632 use memory ccaches, and a FILE one probably means that
633 we're using creds obtained outside of our exectuable
634 */
635 if (strequal(cc_type, "FILE")) {
636 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
637 return False;
638 }
639
640 retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
641 if (retval) {
642 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
643 error_message(retval)));
644 /* If we have an error in this, we want to display it,
645 but continue as though we deleted it */
646 }
647 return True;
648}
649
650/* Allocate and setup the auth context into the state we need. */
651
652static krb5_error_code setup_auth_context(krb5_context context,
653 krb5_auth_context *auth_context)
654{
655 krb5_error_code retval;
656
657 retval = krb5_auth_con_init(context, auth_context );
658 if (retval) {
659 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
660 error_message(retval)));
661 return retval;
662 }
663
664 /* Ensure this is an addressless ticket. */
665 retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
666 if (retval) {
667 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
668 error_message(retval)));
669 }
670
671 return retval;
672}
673
674static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
675 uint32_t gss_flags)
676{
677 unsigned int orig_length = in_data->length;
678 unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
679 char *gss_cksum = NULL;
680
681 if (orig_length) {
682 /* Extra length field for delgated ticket. */
683 base_cksum_size += 4;
684 }
685
686 if ((unsigned int)base_cksum_size + orig_length <
687 (unsigned int)base_cksum_size) {
688 return EINVAL;
689 }
690
691 gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
692 if (gss_cksum == NULL) {
693 return ENOMEM;
694 }
695
696 memset(gss_cksum, '\0', base_cksum_size + orig_length);
697 SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
698
699 /* Precalculated MD5sum of NULL channel bindings (20 bytes) */
700 /* Channel bindings are: (all ints encoded as little endian)
701
702 [4 bytes] initiator_addrtype (255 for null bindings)
703 [4 bytes] initiator_address length
704 [n bytes] .. initiator_address data - not present
705 in null bindings.
706 [4 bytes] acceptor_addrtype (255 for null bindings)
707 [4 bytes] acceptor_address length
708 [n bytes] .. acceptor_address data - not present
709 in null bindings.
710 [4 bytes] application_data length
711 [n bytes] .. application_ data - not present
712 in null bindings.
713 MD5 of this is ""\x14\x8f\x0c\xf7\xb1u\xdey*J\x9a%\xdfV\xc5\x18"
714 */
715
716 memcpy(&gss_cksum[4],
717 "\x14\x8f\x0c\xf7\xb1u\xdey*J\x9a%\xdfV\xc5\x18",
718 GSSAPI_BNDLENGTH);
719
720 SIVAL(gss_cksum, 20, gss_flags);
721
722 if (orig_length) {
723 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
724 SSVAL(gss_cksum, 26, orig_length);
725 /* Copy the kerberos KRB_CRED data */
726 memcpy(gss_cksum + 28, in_data->data, orig_length);
727 free(in_data->data);
728 in_data->data = NULL;
729 in_data->length = 0;
730 }
731 in_data->data = gss_cksum;
732 in_data->length = base_cksum_size + orig_length;
733 return 0;
734}
735
736/*
737 we can't use krb5_mk_req because w2k wants the service to be in a particular format
738*/
739static krb5_error_code ads_krb5_mk_req(krb5_context context,
740 krb5_auth_context *auth_context,
741 const krb5_flags ap_req_options,
742 const char *principal,
743 krb5_ccache ccache,
744 krb5_data *outbuf,
745 time_t *expire_time,
746 const char *impersonate_princ_s)
747{
748 krb5_error_code retval;
749 krb5_principal server;
750 krb5_principal impersonate_princ = NULL;
751 krb5_creds * credsp;
752 krb5_creds creds;
753 krb5_data in_data;
754 bool creds_ready = False;
755 int i = 0, maxtries = 3;
756 uint32_t gss_flags = 0;
757
758 ZERO_STRUCT(in_data);
759
760 retval = smb_krb5_parse_name(context, principal, &server);
761 if (retval) {
762 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
763 return retval;
764 }
765
766 if (impersonate_princ_s) {
767 retval = smb_krb5_parse_name(context, impersonate_princ_s,
768 &impersonate_princ);
769 if (retval) {
770 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
771 goto cleanup_princ;
772 }
773 }
774
775 /* obtain ticket & session key */
776 ZERO_STRUCT(creds);
777 if ((retval = krb5_copy_principal(context, server, &creds.server))) {
778 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
779 error_message(retval)));
780 goto cleanup_princ;
781 }
782
783 if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
784 /* This can commonly fail on smbd startup with no ticket in the cache.
785 * Report at higher level than 1. */
786 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
787 error_message(retval)));
788 goto cleanup_creds;
789 }
790
791 while (!creds_ready && (i < maxtries)) {
792
793 if ((retval = smb_krb5_get_credentials(context, ccache,
794 creds.client,
795 creds.server,
796 impersonate_princ,
797 &credsp))) {
798 DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
799 principal, error_message(retval)));
800 goto cleanup_creds;
801 }
802
803 /* cope with ticket being in the future due to clock skew */
804 if ((unsigned)credsp->times.starttime > time(NULL)) {
805 time_t t = time(NULL);
806 int time_offset =(int)((unsigned)credsp->times.starttime-t);
807 DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
808 krb5_set_real_time(context, t + time_offset + 1, 0);
809 }
810
811 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
812 creds_ready = True;
813 }
814
815 i++;
816 }
817
818 DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
819 principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
820 http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
821 (unsigned)credsp->times.endtime));
822
823 if (expire_time) {
824 *expire_time = (time_t)credsp->times.endtime;
825 }
826
827 /* Allocate the auth_context. */
828 retval = setup_auth_context(context, auth_context);
829 if (retval) {
830 DEBUG(1,("setup_auth_context failed (%s)\n",
831 error_message(retval)));
832 goto cleanup_creds;
833 }
834
835#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)
836 if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
837 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
838 as part of the kerberos exchange. */
839
840 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n") );
841
842 retval = krb5_auth_con_setuseruserkey(context,
843 *auth_context,
844 &credsp->keyblock );
845 if (retval) {
846 DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
847 error_message(retval)));
848 goto cleanup_creds;
849 }
850
851 /* Must use a subkey for forwarded tickets. */
852 retval = krb5_auth_con_setflags(context,
853 *auth_context,
854 KRB5_AUTH_CONTEXT_USE_SUBKEY);
855 if (retval) {
856 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
857 error_message(retval)));
858 goto cleanup_creds;
859 }
860
861 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
862 *auth_context, /* Authentication context [in] */
863 CONST_DISCARD(char *, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
864 credsp->client, /* Client principal for the tgt [in] */
865 credsp->server, /* Server principal for the tgt [in] */
866 ccache, /* Credential cache to use for storage [in] */
867 1, /* Turn on for "Forwardable ticket" [in] */
868 &in_data ); /* Resulting response [out] */
869
870 if (retval) {
871 DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
872 error_message( retval ) ) );
873
874 /*
875 * This is not fatal. Delete the *auth_context and continue
876 * with krb5_mk_req_extended to get a non-forwardable ticket.
877 */
878
879 if (in_data.data) {
880 free( in_data.data );
881 in_data.data = NULL;
882 in_data.length = 0;
883 }
884 krb5_auth_con_free(context, *auth_context);
885 *auth_context = NULL;
886 retval = setup_auth_context(context, auth_context);
887 if (retval) {
888 DEBUG(1,("setup_auth_context failed (%s)\n",
889 error_message(retval)));
890 goto cleanup_creds;
891 }
892 } else {
893 /* We got a delegated ticket. */
894 gss_flags |= GSS_C_DELEG_FLAG;
895 }
896 }
897#endif
898
899 /* Frees and reallocates in_data into a GSS checksum blob. */
900 retval = create_gss_checksum(&in_data, gss_flags);
901 if (retval) {
902 goto cleanup_data;
903 }
904
905#if defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
906 /* We always want GSS-checksum types. */
907 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
908 if (retval) {
909 DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
910 error_message(retval)));
911 goto cleanup_data;
912 }
913#endif
914
915 retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
916 &in_data, credsp, outbuf);
917 if (retval) {
918 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
919 error_message(retval)));
920 }
921
922cleanup_data:
923 if (in_data.data) {
924 free( in_data.data );
925 in_data.length = 0;
926 }
927
928 krb5_free_creds(context, credsp);
929
930cleanup_creds:
931 krb5_free_cred_contents(context, &creds);
932
933cleanup_princ:
934 krb5_free_principal(context, server);
935 if (impersonate_princ) {
936 krb5_free_principal(context, impersonate_princ);
937 }
938
939 return retval;
940}
941
942/*
943 get a kerberos5 ticket for the given service
944*/
945int cli_krb5_get_ticket(const char *principal, time_t time_offset,
946 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
947 uint32 extra_ap_opts, const char *ccname,
948 time_t *tgs_expire,
949 const char *impersonate_princ_s)
950
951{
952 krb5_error_code retval;
953 krb5_data packet;
954 krb5_context context = NULL;
955 krb5_ccache ccdef = NULL;
956 krb5_auth_context auth_context = NULL;
957 krb5_enctype enc_types[] = {
958#ifdef ENCTYPE_ARCFOUR_HMAC
959 ENCTYPE_ARCFOUR_HMAC,
960#endif
961 ENCTYPE_DES_CBC_MD5,
962 ENCTYPE_DES_CBC_CRC,
963 ENCTYPE_NULL};
964
965 initialize_krb5_error_table();
966 retval = krb5_init_context(&context);
967 if (retval) {
968 DEBUG(1,("cli_krb5_get_ticket: krb5_init_context failed (%s)\n",
969 error_message(retval)));
970 goto failed;
971 }
972
973 if (time_offset != 0) {
974 krb5_set_real_time(context, time(NULL) + time_offset, 0);
975 }
976
977 if ((retval = krb5_cc_resolve(context, ccname ?
978 ccname : krb5_cc_default_name(context), &ccdef))) {
979 DEBUG(1,("cli_krb5_get_ticket: krb5_cc_default failed (%s)\n",
980 error_message(retval)));
981 goto failed;
982 }
983
984 if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
985 DEBUG(1,("cli_krb5_get_ticket: krb5_set_default_tgs_ktypes failed (%s)\n",
986 error_message(retval)));
987 goto failed;
988 }
989
990 if ((retval = ads_krb5_mk_req(context,
991 &auth_context,
992 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
993 principal,
994 ccdef, &packet,
995 tgs_expire,
996 impersonate_princ_s))) {
997 goto failed;
998 }
999
1000 get_krb5_smb_session_key(context, auth_context, session_key_krb5, False);
1001
1002 *ticket = data_blob(packet.data, packet.length);
1003
1004 kerberos_free_data_contents(context, &packet);
1005
1006failed:
1007
1008 if ( context ) {
1009 if (ccdef)
1010 krb5_cc_close(context, ccdef);
1011 if (auth_context)
1012 krb5_auth_con_free(context, auth_context);
1013 krb5_free_context(context);
1014 }
1015
1016 return retval;
1017}
1018
1019 bool get_krb5_smb_session_key(krb5_context context, krb5_auth_context auth_context, DATA_BLOB *session_key, bool remote)
1020 {
1021 krb5_keyblock *skey = NULL;
1022 krb5_error_code err = 0;
1023 bool ret = false;
1024
1025 if (remote) {
1026 err = krb5_auth_con_getremotesubkey(context, auth_context, &skey);
1027 } else {
1028 err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey);
1029 }
1030
1031 if (err || skey == NULL) {
1032 DEBUG(10, ("KRB5 error getting session key %d\n", err));
1033 goto done;
1034 }
1035
1036 DEBUG(10, ("Got KRB5 session key of length %d\n", (int)KRB5_KEY_LENGTH(skey)));
1037 *session_key = data_blob(KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
1038 dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
1039
1040 ret = true;
1041
1042 done:
1043 if (skey) {
1044 krb5_free_keyblock(context, skey);
1045 }
1046
1047 return ret;
1048 }
1049
1050
1051#if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
1052 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
1053
1054 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
1055{
1056 static krb5_data kdata;
1057
1058 kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
1059 kdata.length = strlen((const char *)kdata.data);
1060 return &kdata;
1061}
1062#endif
1063
1064 krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
1065{
1066/* Try krb5_free_keytab_entry_contents first, since
1067 * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
1068 * krb5_kt_free_entry but only has a prototype for the first, while the
1069 * second is considered private.
1070 */
1071#if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
1072 return krb5_free_keytab_entry_contents(context, kt_entry);
1073#elif defined(HAVE_KRB5_KT_FREE_ENTRY)
1074 return krb5_kt_free_entry(context, kt_entry);
1075#else
1076#error UNKNOWN_KT_FREE_FUNCTION
1077#endif
1078}
1079
1080 void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
1081 struct PAC_SIGNATURE_DATA *sig)
1082{
1083#ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
1084 cksum->cksumtype = (krb5_cksumtype)sig->type;
1085 cksum->checksum.length = sig->signature.length;
1086 cksum->checksum.data = sig->signature.data;
1087#else
1088 cksum->checksum_type = (krb5_cksumtype)sig->type;
1089 cksum->length = sig->signature.length;
1090 cksum->contents = sig->signature.data;
1091#endif
1092}
1093
1094 krb5_error_code smb_krb5_verify_checksum(krb5_context context,
1095 const krb5_keyblock *keyblock,
1096 krb5_keyusage usage,
1097 krb5_checksum *cksum,
1098 uint8 *data,
1099 size_t length)
1100{
1101 krb5_error_code ret;
1102
1103 /* verify the checksum */
1104
1105 /* welcome to the wonderful world of samba's kerberos abstraction layer:
1106 *
1107 * function heimdal 0.6.1rc3 heimdal 0.7 MIT krb 1.4.2
1108 * -----------------------------------------------------------------------------
1109 * krb5_c_verify_checksum - works works
1110 * krb5_verify_checksum works (6 args) works (6 args) broken (7 args)
1111 */
1112
1113#if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
1114 {
1115 krb5_boolean checksum_valid = False;
1116 krb5_data input;
1117
1118 input.data = (char *)data;
1119 input.length = length;
1120
1121 ret = krb5_c_verify_checksum(context,
1122 keyblock,
1123 usage,
1124 &input,
1125 cksum,
1126 &checksum_valid);
1127 if (ret) {
1128 DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
1129 error_message(ret)));
1130 return ret;
1131 }
1132
1133 if (!checksum_valid)
1134 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1135 }
1136
1137#elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
1138
1139 /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
1140 * without enctype and it ignores any key_usage types - Guenther */
1141
1142 {
1143
1144 krb5_crypto crypto;
1145 ret = krb5_crypto_init(context,
1146 keyblock,
1147 0,
1148 &crypto);
1149 if (ret) {
1150 DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
1151 error_message(ret)));
1152 return ret;
1153 }
1154
1155 ret = krb5_verify_checksum(context,
1156 crypto,
1157 usage,
1158 data,
1159 length,
1160 cksum);
1161
1162 krb5_crypto_destroy(context, crypto);
1163 }
1164
1165#else
1166#error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
1167#endif
1168
1169 return ret;
1170}
1171
1172 time_t get_authtime_from_tkt(krb5_ticket *tkt)
1173{
1174#if defined(HAVE_KRB5_TKT_ENC_PART2)
1175 return tkt->enc_part2->times.authtime;
1176#else
1177 return tkt->ticket.authtime;
1178#endif
1179}
1180
1181#ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1182static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
1183{
1184#ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
1185 if (ap_req->ticket->enc_part.kvno)
1186 return ap_req->ticket->enc_part.kvno;
1187#else /* Heimdal */
1188 if (ap_req->ticket.enc_part.kvno)
1189 return *ap_req->ticket.enc_part.kvno;
1190#endif
1191 return 0;
1192}
1193
1194static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
1195{
1196#ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
1197 return ap_req->ticket.enc_part.etype;
1198#else /* MIT */
1199 return ap_req->ticket->enc_part.enctype;
1200#endif
1201}
1202#endif /* HAVE_KRB5_DECODE_AP_REQ */
1203
1204static krb5_error_code
1205get_key_from_keytab(krb5_context context,
1206 krb5_const_principal server,
1207 krb5_enctype enctype,
1208 krb5_kvno kvno,
1209 krb5_keyblock **out_key)
1210{
1211 krb5_keytab_entry entry;
1212 krb5_error_code ret;
1213 krb5_keytab keytab;
1214 char *name = NULL;
1215 krb5_keyblock *keyp;
1216
1217 /* We have to open a new keytab handle here, as MIT does
1218 an implicit open/getnext/close on krb5_kt_get_entry. We
1219 may be in the middle of a keytab enumeration when this is
1220 called. JRA. */
1221
1222 ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1223 if (ret) {
1224 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1225 return ret;
1226 }
1227
1228 if ( DEBUGLEVEL >= 10 ) {
1229 if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) {
1230 DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1231 kvno, enctype, name));
1232 TALLOC_FREE(name);
1233 }
1234 }
1235
1236 ret = krb5_kt_get_entry(context,
1237 keytab,
1238 server,
1239 kvno,
1240 enctype,
1241 &entry);
1242
1243 if (ret) {
1244 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1245 goto out;
1246 }
1247
1248 keyp = KRB5_KT_KEY(&entry);
1249
1250 ret = krb5_copy_keyblock(context, keyp, out_key);
1251 if (ret) {
1252 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1253 goto out;
1254 }
1255
1256 smb_krb5_kt_free_entry(context, &entry);
1257
1258out:
1259 krb5_kt_close(context, keytab);
1260 return ret;
1261}
1262
1263/* Prototypes */
1264
1265 krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1266 const krb5_data *inbuf,
1267 krb5_kvno *kvno,
1268 krb5_enctype *enctype)
1269{
1270#ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1271 {
1272 krb5_error_code ret;
1273 krb5_ap_req ap_req;
1274
1275 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1276 if (ret)
1277 return ret;
1278
1279 *kvno = get_kvno_from_ap_req(&ap_req);
1280 *enctype = get_enctype_from_ap_req(&ap_req);
1281
1282 free_AP_REQ(&ap_req);
1283 return 0;
1284 }
1285#endif
1286
1287 /* Possibly not an appropriate error code. */
1288 return KRB5KDC_ERR_BADOPTION;
1289}
1290
1291 krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1292 krb5_auth_context *auth_context,
1293 const krb5_data *inbuf,
1294 krb5_const_principal server,
1295 krb5_keytab keytab,
1296 krb5_flags *ap_req_options,
1297 krb5_ticket **ticket,
1298 krb5_keyblock **keyblock)
1299{
1300 krb5_error_code ret;
1301 krb5_kvno kvno;
1302 krb5_enctype enctype;
1303 krb5_keyblock *local_keyblock;
1304
1305 ret = krb5_rd_req(context,
1306 auth_context,
1307 inbuf,
1308 server,
1309 keytab,
1310 ap_req_options,
1311 ticket);
1312 if (ret) {
1313 return ret;
1314 }
1315
1316#ifdef KRB5_TICKET_HAS_KEYINFO
1317 enctype = (*ticket)->enc_part.enctype;
1318 kvno = (*ticket)->enc_part.kvno;
1319#else
1320 ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1321 if (ret) {
1322 return ret;
1323 }
1324#endif
1325
1326 ret = get_key_from_keytab(context,
1327 server,
1328 enctype,
1329 kvno,
1330 &local_keyblock);
1331 if (ret) {
1332 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1333 goto out;
1334 }
1335
1336out:
1337 if (ret && local_keyblock != NULL) {
1338 krb5_free_keyblock(context, local_keyblock);
1339 } else {
1340 *keyblock = local_keyblock;
1341 }
1342
1343 return ret;
1344}
1345
1346 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1347 const char *name,
1348 krb5_principal *principal)
1349{
1350#ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1351 return smb_krb5_parse_name_norealm_conv(context, name, principal);
1352#endif
1353
1354 /* we are cheating here because parse_name will in fact set the realm.
1355 * We don't care as the only caller of smb_krb5_parse_name_norealm
1356 * ignores the realm anyway when calling
1357 * smb_krb5_principal_compare_any_realm later - Guenther */
1358
1359 return smb_krb5_parse_name(context, name, principal);
1360}
1361
1362 bool smb_krb5_principal_compare_any_realm(krb5_context context,
1363 krb5_const_principal princ1,
1364 krb5_const_principal princ2)
1365{
1366#ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1367
1368 return krb5_principal_compare_any_realm(context, princ1, princ2);
1369
1370/* krb5_princ_size is a macro in MIT */
1371#elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1372
1373 int i, len1, len2;
1374 const krb5_data *p1, *p2;
1375
1376 len1 = krb5_princ_size(context, princ1);
1377 len2 = krb5_princ_size(context, princ2);
1378
1379 if (len1 != len2)
1380 return False;
1381
1382 for (i = 0; i < len1; i++) {
1383
1384 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1385 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1386
1387 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1388 return False;
1389 }
1390
1391 return True;
1392#else
1393#error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1394#endif
1395}
1396
1397 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, /* FILE:/tmp/krb5cc_0 */
1398 const char *client_string, /* gd@BER.SUSE.DE */
1399 const char *service_string, /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1400 time_t *expire_time)
1401{
1402 krb5_error_code ret;
1403 krb5_context context = NULL;
1404 krb5_ccache ccache = NULL;
1405 krb5_principal client = NULL;
1406 krb5_creds creds, creds_in, *creds_out = NULL;
1407
1408 ZERO_STRUCT(creds);
1409 ZERO_STRUCT(creds_in);
1410
1411 initialize_krb5_error_table();
1412 ret = krb5_init_context(&context);
1413 if (ret) {
1414 goto done;
1415 }
1416
1417 if (!ccache_string) {
1418 ccache_string = krb5_cc_default_name(context);
1419 }
1420
1421 if (!ccache_string) {
1422 ret = EINVAL;
1423 goto done;
1424 }
1425
1426 DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1427
1428 /* FIXME: we should not fall back to defaults */
1429 ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1430 if (ret) {
1431 goto done;
1432 }
1433
1434 if (client_string) {
1435 ret = smb_krb5_parse_name(context, client_string, &client);
1436 if (ret) {
1437 goto done;
1438 }
1439 } else {
1440 ret = krb5_cc_get_principal(context, ccache, &client);
1441 if (ret) {
1442 goto done;
1443 }
1444 }
1445
1446#ifdef HAVE_KRB5_GET_RENEWED_CREDS /* MIT */
1447 {
1448 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1449 if (ret) {
1450 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1451 goto done;
1452 }
1453 }
1454#elif defined(HAVE_KRB5_GET_KDC_CRED) /* Heimdal */
1455 {
1456 krb5_kdc_flags flags;
1457 krb5_realm *client_realm = NULL;
1458
1459 ret = krb5_copy_principal(context, client, &creds_in.client);
1460 if (ret) {
1461 goto done;
1462 }
1463
1464 if (service_string) {
1465 ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1466 if (ret) {
1467 goto done;
1468 }
1469 } else {
1470 /* build tgt service by default */
1471 client_realm = krb5_princ_realm(context, creds_in.client);
1472 if (!client_realm) {
1473 ret = ENOMEM;
1474 goto done;
1475 }
1476 ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1477 if (ret) {
1478 goto done;
1479 }
1480 }
1481
1482 flags.i = 0;
1483 flags.b.renewable = flags.b.renew = True;
1484
1485 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1486 if (ret) {
1487 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1488 goto done;
1489 }
1490
1491 creds = *creds_out;
1492 }
1493#else
1494#error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1495#endif
1496
1497 /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1498 ret = krb5_cc_initialize(context, ccache, client);
1499 if (ret) {
1500 goto done;
1501 }
1502
1503 ret = krb5_cc_store_cred(context, ccache, &creds);
1504
1505 if (expire_time) {
1506 *expire_time = (time_t) creds.times.endtime;
1507 }
1508
1509done:
1510 krb5_free_cred_contents(context, &creds_in);
1511
1512 if (creds_out) {
1513 krb5_free_creds(context, creds_out);
1514 } else {
1515 krb5_free_cred_contents(context, &creds);
1516 }
1517
1518 if (client) {
1519 krb5_free_principal(context, client);
1520 }
1521 if (ccache) {
1522 krb5_cc_close(context, ccache);
1523 }
1524 if (context) {
1525 krb5_free_context(context);
1526 }
1527
1528 return ret;
1529}
1530
1531 krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1532{
1533 krb5_error_code ret = 0;
1534 if (addr == NULL) {
1535 return ret;
1536 }
1537#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1538 krb5_free_addresses(context, addr->addrs);
1539#elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1540 ret = krb5_free_addresses(context, addr->addrs);
1541 SAFE_FREE(addr->addrs);
1542#endif
1543 SAFE_FREE(addr);
1544 addr = NULL;
1545 return ret;
1546}
1547
1548 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1549{
1550 krb5_error_code ret = 0;
1551 nstring buf;
1552#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1553 krb5_address **addrs = NULL;
1554#elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1555 krb5_addresses *addrs = NULL;
1556#endif
1557
1558 *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1559 if (*kerb_addr == NULL) {
1560 return ENOMEM;
1561 }
1562
1563 put_name(buf, global_myname(), ' ', 0x20);
1564
1565#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1566 {
1567 int num_addr = 2;
1568
1569 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1570 if (addrs == NULL) {
1571 SAFE_FREE(*kerb_addr);
1572 return ENOMEM;
1573 }
1574
1575 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1576
1577 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1578 if (addrs[0] == NULL) {
1579 SAFE_FREE(addrs);
1580 SAFE_FREE(*kerb_addr);
1581 return ENOMEM;
1582 }
1583
1584 addrs[0]->magic = KV5M_ADDRESS;
1585 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1586 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1587 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1588 if (addrs[0]->contents == NULL) {
1589 SAFE_FREE(addrs[0]);
1590 SAFE_FREE(addrs);
1591 SAFE_FREE(*kerb_addr);
1592 return ENOMEM;
1593 }
1594
1595 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1596
1597 addrs[1] = NULL;
1598 }
1599#elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1600 {
1601 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1602 if (addrs == NULL) {
1603 SAFE_FREE(*kerb_addr);
1604 return ENOMEM;
1605 }
1606
1607 memset(addrs, 0, sizeof(krb5_addresses));
1608
1609 addrs->len = 1;
1610 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1611 if (addrs->val == NULL) {
1612 SAFE_FREE(addrs);
1613 SAFE_FREE(kerb_addr);
1614 return ENOMEM;
1615 }
1616
1617 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1618 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1619 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1620 if (addrs->val[0].address.data == NULL) {
1621 SAFE_FREE(addrs->val);
1622 SAFE_FREE(addrs);
1623 SAFE_FREE(*kerb_addr);
1624 return ENOMEM;
1625 }
1626
1627 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1628 }
1629#else
1630#error UNKNOWN_KRB5_ADDRESS_FORMAT
1631#endif
1632 (*kerb_addr)->addrs = addrs;
1633
1634 return ret;
1635}
1636
1637 void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1638{
1639#ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1640 krb5_free_error_contents(context, krberror);
1641#else /* MIT */
1642 krb5_free_error(context, krberror);
1643#endif
1644}
1645
1646 krb5_error_code handle_krberror_packet(krb5_context context,
1647 krb5_data *packet)
1648{
1649 krb5_error_code ret;
1650 bool got_error_code = False;
1651
1652 DEBUG(10,("handle_krberror_packet: got error packet\n"));
1653
1654#ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1655 {
1656 krb5_error krberror;
1657
1658 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1659 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1660 error_message(ret)));
1661 return ret;
1662 }
1663
1664 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1665 ret = (krb5_error_code) krberror.error_code;
1666 got_error_code = True;
1667 }
1668
1669 smb_krb5_free_error(context, &krberror);
1670 }
1671#else /* MIT */
1672 {
1673 krb5_error *krberror;
1674
1675 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1676 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1677 error_message(ret)));
1678 return ret;
1679 }
1680
1681 if (krberror->e_data.data == NULL) {
1682#if defined(ERROR_TABLE_BASE_krb5)
1683 ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1684#else
1685 ret = (krb5_error_code)krberror->error;
1686#endif
1687 got_error_code = True;
1688 }
1689 smb_krb5_free_error(context, krberror);
1690 }
1691#endif
1692 if (got_error_code) {
1693 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1694 error_message(ret), ret));
1695 }
1696 return ret;
1697}
1698
1699 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1700 krb5_get_init_creds_opt **opt)
1701{
1702#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1703 /* Heimdal or modern MIT version */
1704 return krb5_get_init_creds_opt_alloc(context, opt);
1705#else
1706 /* Historical MIT version */
1707 krb5_get_init_creds_opt *my_opt;
1708
1709 *opt = NULL;
1710
1711 if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1712 return ENOMEM;
1713 }
1714
1715 krb5_get_init_creds_opt_init(my_opt);
1716
1717 *opt = my_opt;
1718 return 0;
1719#endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC */
1720}
1721
1722 void smb_krb5_get_init_creds_opt_free(krb5_context context,
1723 krb5_get_init_creds_opt *opt)
1724{
1725#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1726
1727#ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1728 /* Modern MIT or Heimdal version */
1729 krb5_get_init_creds_opt_free(context, opt);
1730#else
1731 /* Heimdal version */
1732 krb5_get_init_creds_opt_free(opt);
1733#endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1734
1735#else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1736 /* Historical MIT version */
1737 SAFE_FREE(opt);
1738 opt = NULL;
1739#endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1740}
1741
1742 krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1743{
1744 return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1745}
1746
1747
1748/* caller needs to free etype_s */
1749 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1750 krb5_enctype enctype,
1751 char **etype_s)
1752{
1753#ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1754 return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1755#elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1756 char buf[256];
1757 krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1758 if (ret) {
1759 return ret;
1760 }
1761 *etype_s = SMB_STRDUP(buf);
1762 if (!*etype_s) {
1763 return ENOMEM;
1764 }
1765 return ret;
1766#else
1767#error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1768#endif
1769}
1770
1771 krb5_error_code smb_krb5_mk_error(krb5_context context,
1772 krb5_error_code error_code,
1773 const krb5_principal server,
1774 krb5_data *reply)
1775{
1776#ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1777 /*
1778 * The MIT interface is *terrible*.
1779 * We have to construct this ourselves...
1780 */
1781 krb5_error e;
1782
1783 memset(&e, 0, sizeof(e));
1784 krb5_us_timeofday(context, &e.stime, &e.susec);
1785 e.server = server;
1786#if defined(krb5_err_base)
1787 e.error = error_code - krb5_err_base;
1788#elif defined(ERROR_TABLE_BASE_krb5)
1789 e.error = error_code - ERROR_TABLE_BASE_krb5;
1790#else
1791 e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1792#endif
1793
1794 return krb5_mk_error(context, &e, reply);
1795#else /* Heimdal. */
1796 return krb5_mk_error(context,
1797 error_code,
1798 NULL,
1799 NULL, /* e_data */
1800 NULL,
1801 server,
1802 NULL,
1803 NULL,
1804 reply);
1805#endif
1806}
1807
1808/**********************************************************************
1809 * Open a krb5 keytab with flags, handles readonly or readwrite access and
1810 * allows to process non-default keytab names.
1811 * @param context krb5_context
1812 * @param keytab_name_req string
1813 * @param write_access bool if writable keytab is required
1814 * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1815 * @return krb5_error_code
1816**********************************************************************/
1817
1818/* This MAX_NAME_LEN is a constant defined in krb5.h */
1819#ifndef MAX_KEYTAB_NAME_LEN
1820#define MAX_KEYTAB_NAME_LEN 1100
1821#endif
1822
1823 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1824 const char *keytab_name_req,
1825 bool write_access,
1826 krb5_keytab *keytab)
1827{
1828 krb5_error_code ret = 0;
1829 TALLOC_CTX *mem_ctx;
1830 char keytab_string[MAX_KEYTAB_NAME_LEN];
1831 char *kt_str = NULL;
1832 bool found_valid_name = False;
1833 const char *pragma = "FILE";
1834 const char *tmp = NULL;
1835
1836 if (!write_access && !keytab_name_req) {
1837 /* caller just wants to read the default keytab readonly, so be it */
1838 return krb5_kt_default(context, keytab);
1839 }
1840
1841 mem_ctx = talloc_init("smb_krb5_open_keytab");
1842 if (!mem_ctx) {
1843 return ENOMEM;
1844 }
1845
1846#ifdef HAVE_WRFILE_KEYTAB
1847 if (write_access) {
1848 pragma = "WRFILE";
1849 }
1850#endif
1851
1852 if (keytab_name_req) {
1853
1854 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1855 ret = KRB5_CONFIG_NOTENUFSPACE;
1856 goto out;
1857 }
1858
1859 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1860 (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1861 tmp = keytab_name_req;
1862 goto resolve;
1863 }
1864
1865 if (keytab_name_req[0] != '/') {
1866 ret = KRB5_KT_BADNAME;
1867 goto out;
1868 }
1869
1870 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1871 if (!tmp) {
1872 ret = ENOMEM;
1873 goto out;
1874 }
1875
1876 goto resolve;
1877 }
1878
1879 /* we need to handle more complex keytab_strings, like:
1880 * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1881
1882 ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1883 if (ret) {
1884 goto out;
1885 }
1886
1887 DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1888
1889 tmp = talloc_strdup(mem_ctx, keytab_string);
1890 if (!tmp) {
1891 ret = ENOMEM;
1892 goto out;
1893 }
1894
1895 if (strncmp(tmp, "ANY:", 4) == 0) {
1896 tmp += 4;
1897 }
1898
1899 memset(&keytab_string, '\0', sizeof(keytab_string));
1900
1901 while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1902 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1903 found_valid_name = True;
1904 tmp = kt_str;
1905 tmp += 7;
1906 }
1907
1908 if (strncmp(kt_str, "FILE:", 5) == 0) {
1909 found_valid_name = True;
1910 tmp = kt_str;
1911 tmp += 5;
1912 }
1913
1914 if (tmp[0] == '/') {
1915 /* Treat as a FILE: keytab definition. */
1916 found_valid_name = true;
1917 }
1918
1919 if (found_valid_name) {
1920 if (tmp[0] != '/') {
1921 ret = KRB5_KT_BADNAME;
1922 goto out;
1923 }
1924
1925 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1926 if (!tmp) {
1927 ret = ENOMEM;
1928 goto out;
1929 }
1930 break;
1931 }
1932 }
1933
1934 if (!found_valid_name) {
1935 ret = KRB5_KT_UNKNOWN_TYPE;
1936 goto out;
1937 }
1938
1939 resolve:
1940 DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1941 ret = krb5_kt_resolve(context, tmp, keytab);
1942
1943 out:
1944 TALLOC_FREE(mem_ctx);
1945 return ret;
1946}
1947
1948krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1949 krb5_context context,
1950 krb5_keytab keytab,
1951 const char **keytab_name)
1952{
1953 char keytab_string[MAX_KEYTAB_NAME_LEN];
1954 krb5_error_code ret = 0;
1955
1956 ret = krb5_kt_get_name(context, keytab,
1957 keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1958 if (ret) {
1959 return ret;
1960 }
1961
1962 *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1963 if (!*keytab_name) {
1964 return ENOMEM;
1965 }
1966
1967 return ret;
1968}
1969
1970#if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1971 defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1972 defined(HAVE_KRB5_GET_CREDS)
1973static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1974 krb5_ccache ccache,
1975 krb5_principal me,
1976 krb5_principal server,
1977 krb5_principal impersonate_princ,
1978 krb5_creds **out_creds)
1979{
1980 krb5_error_code ret;
1981 krb5_get_creds_opt opt;
1982
1983 ret = krb5_get_creds_opt_alloc(context, &opt);
1984 if (ret) {
1985 goto done;
1986 }
1987 krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1988
1989 if (impersonate_princ) {
1990 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1991 impersonate_princ);
1992 if (ret) {
1993 goto done;
1994 }
1995 }
1996
1997 ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1998 if (ret) {
1999 goto done;
2000 }
2001
2002 done:
2003 if (opt) {
2004 krb5_get_creds_opt_free(context, opt);
2005 }
2006 return ret;
2007}
2008#endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
2009
2010#ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
2011static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
2012 krb5_ccache ccache,
2013 krb5_principal me,
2014 krb5_principal server,
2015 krb5_principal impersonate_princ,
2016 krb5_creds **out_creds)
2017{
2018 krb5_error_code ret;
2019 krb5_creds in_creds;
2020
2021#if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
2022krb5_error_code KRB5_CALLCONV
2023krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
2024 krb5_ccache ccache, krb5_creds *in_creds,
2025 krb5_data *subject_cert,
2026 krb5_creds **out_creds);
2027#endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
2028
2029 ZERO_STRUCT(in_creds);
2030
2031 if (impersonate_princ) {
2032
2033 in_creds.server = me;
2034 in_creds.client = impersonate_princ;
2035
2036 ret = krb5_get_credentials_for_user(context,
2037 0, /* krb5_flags options */
2038 ccache,
2039 &in_creds,
2040 NULL, /* krb5_data *subject_cert */
2041 out_creds);
2042 } else {
2043 in_creds.client = me;
2044 in_creds.server = server;
2045
2046 ret = krb5_get_credentials(context, 0, ccache,
2047 &in_creds, out_creds);
2048 }
2049
2050 return ret;
2051}
2052#endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
2053
2054/*
2055 * smb_krb5_get_credentials
2056 *
2057 * @brief Get krb5 credentials for a server
2058 *
2059 * @param[in] context An initialized krb5_context
2060 * @param[in] ccache An initialized krb5_ccache
2061 * @param[in] me The krb5_principal of the caller
2062 * @param[in] server The krb5_principal of the requested service
2063 * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
2064 * @param[out] out_creds The returned krb5_creds structure
2065 * @return krb5_error_code
2066 *
2067 */
2068krb5_error_code smb_krb5_get_credentials(krb5_context context,
2069 krb5_ccache ccache,
2070 krb5_principal me,
2071 krb5_principal server,
2072 krb5_principal impersonate_princ,
2073 krb5_creds **out_creds)
2074{
2075 krb5_error_code ret;
2076 krb5_creds *creds = NULL;
2077
2078 *out_creds = NULL;
2079
2080 if (impersonate_princ) {
2081#ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
2082 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
2083#elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
2084 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
2085#else
2086 ret = ENOTSUP;
2087#endif
2088 } else {
2089 krb5_creds in_creds;
2090
2091 ZERO_STRUCT(in_creds);
2092
2093 in_creds.client = me;
2094 in_creds.server = server;
2095
2096 ret = krb5_get_credentials(context, 0, ccache,
2097 &in_creds, &creds);
2098 }
2099 if (ret) {
2100 goto done;
2101 }
2102
2103 ret = krb5_cc_store_cred(context, ccache, creds);
2104 if (ret) {
2105 goto done;
2106 }
2107
2108 if (out_creds) {
2109 *out_creds = creds;
2110 }
2111
2112 done:
2113 if (creds && ret) {
2114 krb5_free_creds(context, creds);
2115 }
2116
2117 return ret;
2118}
2119
2120/*
2121 * smb_krb5_get_creds
2122 *
2123 * @brief Get krb5 credentials for a server
2124 *
2125 * @param[in] server_s The string name of the service
2126 * @param[in] time_offset The offset to the KDCs time in seconds (optional)
2127 * @param[in] cc The krb5 credential cache string name (optional)
2128 * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
2129 * @param[out] creds_p The returned krb5_creds structure
2130 * @return krb5_error_code
2131 *
2132 */
2133krb5_error_code smb_krb5_get_creds(const char *server_s,
2134 time_t time_offset,
2135 const char *cc,
2136 const char *impersonate_princ_s,
2137 krb5_creds **creds_p)
2138{
2139 krb5_error_code ret;
2140 krb5_context context = NULL;
2141 krb5_principal me = NULL;
2142 krb5_principal server = NULL;
2143 krb5_principal impersonate_princ = NULL;
2144 krb5_creds *creds = NULL;
2145 krb5_ccache ccache = NULL;
2146
2147 *creds_p = NULL;
2148
2149 initialize_krb5_error_table();
2150 ret = krb5_init_context(&context);
2151 if (ret) {
2152 goto done;
2153 }
2154
2155 if (time_offset != 0) {
2156 krb5_set_real_time(context, time(NULL) + time_offset, 0);
2157 }
2158
2159 ret = krb5_cc_resolve(context, cc ? cc :
2160 krb5_cc_default_name(context), &ccache);
2161 if (ret) {
2162 goto done;
2163 }
2164
2165 ret = krb5_cc_get_principal(context, ccache, &me);
2166 if (ret) {
2167 goto done;
2168 }
2169
2170 ret = smb_krb5_parse_name(context, server_s, &server);
2171 if (ret) {
2172 goto done;
2173 }
2174
2175 if (impersonate_princ_s) {
2176 ret = smb_krb5_parse_name(context, impersonate_princ_s,
2177 &impersonate_princ);
2178 if (ret) {
2179 goto done;
2180 }
2181 }
2182
2183 ret = smb_krb5_get_credentials(context, ccache,
2184 me, server, impersonate_princ,
2185 &creds);
2186 if (ret) {
2187 goto done;
2188 }
2189
2190 ret = krb5_cc_store_cred(context, ccache, creds);
2191 if (ret) {
2192 goto done;
2193 }
2194
2195 if (creds_p) {
2196 *creds_p = creds;
2197 }
2198
2199 DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
2200 server_s));
2201
2202 if (impersonate_princ_s) {
2203 char *client = NULL;
2204
2205 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
2206 if (ret) {
2207 goto done;
2208 }
2209 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
2210 client));
2211 TALLOC_FREE(client);
2212 }
2213
2214 done:
2215 if (!context) {
2216 return ret;
2217 }
2218
2219 if (creds && ret) {
2220 krb5_free_creds(context, creds);
2221 }
2222 if (server) {
2223 krb5_free_principal(context, server);
2224 }
2225 if (me) {
2226 krb5_free_principal(context, me);
2227 }
2228 if (impersonate_princ) {
2229 krb5_free_principal(context, impersonate_princ);
2230 }
2231 if (ccache) {
2232 krb5_cc_close(context, ccache);
2233 }
2234 krb5_free_context(context);
2235
2236 return ret;
2237}
2238
2239/*
2240 * smb_krb5_principal_get_realm
2241 *
2242 * @brief Get realm of a principal
2243 *
2244 * @param[in] context The krb5_context
2245 * @param[in] principal The principal
2246 * @return pointer to the realm
2247 *
2248 */
2249
2250char *smb_krb5_principal_get_realm(krb5_context context,
2251 krb5_principal principal)
2252{
2253#ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2254 return krb5_principal_get_realm(context, principal);
2255#elif defined(krb5_princ_realm) /* MIT */
2256 krb5_data *realm;
2257 realm = krb5_princ_realm(context, principal);
2258 return (char *)realm->data;
2259#else
2260 return NULL;
2261#endif
2262}
2263
2264#else /* HAVE_KRB5 */
2265 /* this saves a few linking headaches */
2266 int cli_krb5_get_ticket(const char *principal, time_t time_offset,
2267 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, uint32 extra_ap_opts,
2268 const char *ccname, time_t *tgs_expire,
2269 const char *impersonate_princ_s)
2270{
2271 DEBUG(0,("NO KERBEROS SUPPORT\n"));
2272 return 1;
2273}
2274
2275#endif
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