source: trunk/server/source3/libsmb/clikrb5.c@ 752

Last change on this file since 752 was 751, checked in by Silvan Scherrer, 13 years ago

Samba Server: updated trunk to 3.6.9
File size: 57.6 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 "../librpc/gen_ndr/krb5pac.h"
26#include "../lib/util/asn1.h"
27#include "libsmb/nmblib.h"
28
29#ifndef KRB5_AUTHDATA_WIN2K_PAC
30#define KRB5_AUTHDATA_WIN2K_PAC 128
31#endif
32
33#ifndef KRB5_AUTHDATA_IF_RELEVANT
34#define KRB5_AUTHDATA_IF_RELEVANT 1
35#endif
36
37#ifdef HAVE_KRB5
38
39#define GSSAPI_CHECKSUM 0x8003 /* Checksum type value for Kerberos */
40#define GSSAPI_BNDLENGTH 16 /* Bind Length (rfc-1964 pg.3) */
41#define GSSAPI_CHECKSUM_SIZE (4+GSSAPI_BNDLENGTH+4) /* Length of bind length,
42 bind field, flags field. */
43
44/* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
45 but still has the symbol */
46#if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
47krb5_error_code krb5_auth_con_set_req_cksumtype(
48 krb5_context context,
49 krb5_auth_context auth_context,
50 krb5_cksumtype cksumtype);
51#endif
52
53/**************************************************************
54 Wrappers around kerberos string functions that convert from
55 utf8 -> unix charset and vica versa.
56**************************************************************/
57
58/**************************************************************
59 krb5_parse_name that takes a UNIX charset.
60**************************************************************/
61
62 krb5_error_code smb_krb5_parse_name(krb5_context context,
63 const char *name, /* in unix charset */
64 krb5_principal *principal)
65{
66 krb5_error_code ret;
67 char *utf8_name;
68 size_t converted_size;
69
70 if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
71 return ENOMEM;
72 }
73
74 ret = krb5_parse_name(context, utf8_name, principal);
75 TALLOC_FREE(utf8_name);
76 return ret;
77}
78
79#ifdef HAVE_KRB5_PARSE_NAME_NOREALM
80/**************************************************************
81 krb5_parse_name_norealm that takes a UNIX charset.
82**************************************************************/
83
84static krb5_error_code smb_krb5_parse_name_norealm_conv(krb5_context context,
85 const char *name, /* in unix charset */
86 krb5_principal *principal)
87{
88 krb5_error_code ret;
89 char *utf8_name;
90 size_t converted_size;
91
92 *principal = NULL;
93 if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
94 return ENOMEM;
95 }
96
97 ret = krb5_parse_name_norealm(context, utf8_name, principal);
98 TALLOC_FREE(utf8_name);
99 return ret;
100}
101#endif
102
103/**************************************************************
104 krb5_parse_name that returns a UNIX charset name. Must
105 be freed with talloc_free() call.
106**************************************************************/
107
108krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
109 krb5_context context,
110 krb5_const_principal principal,
111 char **unix_name)
112{
113 krb5_error_code ret;
114 char *utf8_name;
115 size_t converted_size;
116
117 *unix_name = NULL;
118 ret = krb5_unparse_name(context, principal, &utf8_name);
119 if (ret) {
120 return ret;
121 }
122
123 if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
124 krb5_free_unparsed_name(context, utf8_name);
125 return ENOMEM;
126 }
127 krb5_free_unparsed_name(context, utf8_name);
128 return 0;
129}
130
131#ifndef HAVE_KRB5_SET_REAL_TIME
132/*
133 * This function is not in the Heimdal mainline.
134 */
135 krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds)
136{
137 krb5_error_code ret;
138 int32_t sec, usec;
139
140 ret = krb5_us_timeofday(context, &sec, &usec);
141 if (ret)
142 return ret;
143
144 context->kdc_sec_offset = seconds - sec;
145 context->kdc_usec_offset = microseconds - usec;
146
147 return 0;
148}
149#endif
150
151#if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
152
153#if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
154
155/* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
156 * to krb5_set_default_tgs_ktypes. See
157 * http://lists.samba.org/archive/samba-technical/2006-July/048271.html
158 *
159 * If the MIT libraries are not exporting internal symbols, we will end up in
160 * this branch, which is correct. Otherwise we will continue to use the
161 * internal symbol
162 */
163 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
164{
165 return krb5_set_default_tgs_enctypes(ctx, enc);
166}
167
168#elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
169
170/* Heimdal */
171 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
172{
173 return krb5_set_default_in_tkt_etypes(ctx, enc);
174}
175
176#endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
177
178#endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
179
180#if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
181/* HEIMDAL */
182 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
183{
184 memset(pkaddr, '\0', sizeof(krb5_address));
185#if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
186 if (paddr->ss_family == AF_INET6) {
187 pkaddr->addr_type = KRB5_ADDRESS_INET6;
188 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
189 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
190 return true;
191 }
192#endif
193 if (paddr->ss_family == AF_INET) {
194 pkaddr->addr_type = KRB5_ADDRESS_INET;
195 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
196 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
197 return true;
198 }
199 return false;
200}
201#elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
202/* MIT */
203 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
204{
205 memset(pkaddr, '\0', sizeof(krb5_address));
206#if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
207 if (paddr->ss_family == AF_INET6) {
208 pkaddr->addrtype = ADDRTYPE_INET6;
209 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
210 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
211 return true;
212 }
213#endif
214 if (paddr->ss_family == AF_INET) {
215 pkaddr->addrtype = ADDRTYPE_INET;
216 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
217 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
218 return true;
219 }
220 return false;
221}
222#else
223#error UNKNOWN_ADDRTYPE
224#endif
225
226#if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY) && defined(HAVE_KRB5_ENCRYPT_BLOCK)
227static int create_kerberos_key_from_string_direct(krb5_context context,
228 krb5_principal host_princ,
229 krb5_data *password,
230 krb5_keyblock *key,
231 krb5_enctype enctype)
232{
233 int ret = 0;
234 krb5_data salt;
235 krb5_encrypt_block eblock;
236
237 ret = krb5_principal2salt(context, host_princ, &salt);
238 if (ret) {
239 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
240 return ret;
241 }
242 krb5_use_enctype(context, &eblock, enctype);
243 ret = krb5_string_to_key(context, &eblock, key, password, &salt);
244 SAFE_FREE(salt.data);
245
246 return ret;
247}
248#elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
249static int create_kerberos_key_from_string_direct(krb5_context context,
250 krb5_principal host_princ,
251 krb5_data *password,
252 krb5_keyblock *key,
253 krb5_enctype enctype)
254{
255 int ret;
256 krb5_salt salt;
257
258 ret = krb5_get_pw_salt(context, host_princ, &salt);
259 if (ret) {
260 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
261 return ret;
262 }
263
264 ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
265 krb5_free_salt(context, salt);
266
267 return ret;
268}
269#else
270#error UNKNOWN_CREATE_KEY_FUNCTIONS
271#endif
272
273 int create_kerberos_key_from_string(krb5_context context,
274 krb5_principal host_princ,
275 krb5_data *password,
276 krb5_keyblock *key,
277 krb5_enctype enctype,
278 bool no_salt)
279{
280 krb5_principal salt_princ = NULL;
281 int ret;
282 /*
283 * Check if we've determined that the KDC is salting keys for this
284 * principal/enctype in a non-obvious way. If it is, try to match
285 * its behavior.
286 */
287 if (no_salt) {
288 KRB5_KEY_DATA(key) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
289 if (!KRB5_KEY_DATA(key)) {
290 return ENOMEM;
291 }
292 memcpy(KRB5_KEY_DATA(key), password->data, password->length);
293 KRB5_KEY_LENGTH(key) = password->length;
294 KRB5_KEY_TYPE(key) = enctype;
295 return 0;
296 }
297 salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype);
298 ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype);
299 if (salt_princ) {
300 krb5_free_principal(context, salt_princ);
301 }
302 return ret;
303}
304
305#if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
306 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
307 krb5_enctype **enctypes)
308{
309 return krb5_get_permitted_enctypes(context, enctypes);
310}
311#elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
312 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
313 krb5_enctype **enctypes)
314{
315 return krb5_get_default_in_tkt_etypes(context, enctypes);
316}
317#else
318#error UNKNOWN_GET_ENCTYPES_FUNCTIONS
319#endif
320
321#if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
322 krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
323 krb5_auth_context auth_context,
324 krb5_keyblock *keyblock)
325{
326 return krb5_auth_con_setkey(context, auth_context, keyblock);
327}
328#endif
329
330bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
331 DATA_BLOB *edata,
332 DATA_BLOB *edata_out)
333{
334 DATA_BLOB edata_contents;
335 ASN1_DATA *data;
336 int edata_type;
337
338 if (!edata->length) {
339 return False;
340 }
341
342 data = asn1_init(mem_ctx);
343 if (data == NULL) {
344 return false;
345 }
346
347 asn1_load(data, *edata);
348 asn1_start_tag(data, ASN1_SEQUENCE(0));
349 asn1_start_tag(data, ASN1_CONTEXT(1));
350 asn1_read_Integer(data, &edata_type);
351
352 if (edata_type != KRB5_PADATA_PW_SALT) {
353 DEBUG(0,("edata is not of required type %d but of type %d\n",
354 KRB5_PADATA_PW_SALT, edata_type));
355 asn1_free(data);
356 return False;
357 }
358
359 asn1_start_tag(data, ASN1_CONTEXT(2));
360 asn1_read_OctetString(data, talloc_tos(), &edata_contents);
361 asn1_end_tag(data);
362 asn1_end_tag(data);
363 asn1_end_tag(data);
364 asn1_free(data);
365
366 *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
367
368 data_blob_free(&edata_contents);
369
370 return True;
371}
372
373
374bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
375{
376 DATA_BLOB pac_contents;
377 ASN1_DATA *data;
378 int data_type;
379
380 if (!auth_data->length) {
381 return False;
382 }
383
384 data = asn1_init(mem_ctx);
385 if (data == NULL) {
386 return false;
387 }
388
389 asn1_load(data, *auth_data);
390 asn1_start_tag(data, ASN1_SEQUENCE(0));
391 asn1_start_tag(data, ASN1_SEQUENCE(0));
392 asn1_start_tag(data, ASN1_CONTEXT(0));
393 asn1_read_Integer(data, &data_type);
394
395 if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) {
396 DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type));
397 asn1_free(data);
398 return False;
399 }
400
401 asn1_end_tag(data);
402 asn1_start_tag(data, ASN1_CONTEXT(1));
403 asn1_read_OctetString(data, talloc_tos(), &pac_contents);
404 asn1_end_tag(data);
405 asn1_end_tag(data);
406 asn1_end_tag(data);
407 asn1_free(data);
408
409 *unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length);
410
411 data_blob_free(&pac_contents);
412
413 return True;
414}
415
416 bool get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt)
417{
418 DATA_BLOB auth_data_wrapped;
419 bool got_auth_data_pac = False;
420 int i;
421
422#if defined(HAVE_KRB5_TKT_ENC_PART2)
423 if (tkt->enc_part2 && tkt->enc_part2->authorization_data &&
424 tkt->enc_part2->authorization_data[0] &&
425 tkt->enc_part2->authorization_data[0]->length)
426 {
427 for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) {
428
429 if (tkt->enc_part2->authorization_data[i]->ad_type !=
430 KRB5_AUTHDATA_IF_RELEVANT) {
431 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
432 tkt->enc_part2->authorization_data[i]->ad_type));
433 continue;
434 }
435
436 auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents,
437 tkt->enc_part2->authorization_data[i]->length);
438
439 /* check if it is a PAC */
440 got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
441 data_blob_free(&auth_data_wrapped);
442
443 if (got_auth_data_pac) {
444 return true;
445 }
446 }
447
448 return got_auth_data_pac;
449 }
450
451#else
452 if (tkt->ticket.authorization_data &&
453 tkt->ticket.authorization_data->len)
454 {
455 for (i = 0; i < tkt->ticket.authorization_data->len; i++) {
456
457 if (tkt->ticket.authorization_data->val[i].ad_type !=
458 KRB5_AUTHDATA_IF_RELEVANT) {
459 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
460 tkt->ticket.authorization_data->val[i].ad_type));
461 continue;
462 }
463
464 auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data,
465 tkt->ticket.authorization_data->val[i].ad_data.length);
466
467 /* check if it is a PAC */
468 got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
469 data_blob_free(&auth_data_wrapped);
470
471 if (got_auth_data_pac) {
472 return true;
473 }
474 }
475
476 return got_auth_data_pac;
477 }
478#endif
479 return False;
480}
481
482 krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
483{
484#if defined(HAVE_KRB5_TKT_ENC_PART2)
485 return tkt->enc_part2->client;
486#else
487 return tkt->client;
488#endif
489}
490
491#if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
492 void krb5_free_unparsed_name(krb5_context context, char *val)
493{
494 SAFE_FREE(val);
495}
496#endif
497
498 void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
499{
500#if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
501 if (pdata->data) {
502 krb5_free_data_contents(context, pdata);
503 }
504#else
505 SAFE_FREE(pdata->data);
506#endif
507}
508
509 void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype)
510{
511#if defined(HAVE_KRB5_KEYBLOCK_IN_CREDS)
512 KRB5_KEY_TYPE((&pcreds->keyblock)) = enctype;
513#elif defined(HAVE_KRB5_SESSION_IN_CREDS)
514 KRB5_KEY_TYPE((&pcreds->session)) = enctype;
515#else
516#error UNKNOWN_KEYBLOCK_MEMBER_IN_KRB5_CREDS_STRUCT
517#endif
518}
519
520 bool kerberos_compatible_enctypes(krb5_context context,
521 krb5_enctype enctype1,
522 krb5_enctype enctype2)
523{
524#if defined(HAVE_KRB5_C_ENCTYPE_COMPARE)
525 krb5_boolean similar = 0;
526
527 krb5_c_enctype_compare(context, enctype1, enctype2, &similar);
528 return similar ? True : False;
529#elif defined(HAVE_KRB5_ENCTYPES_COMPATIBLE_KEYS)
530 return krb5_enctypes_compatible_keys(context, enctype1, enctype2) ? True : False;
531#endif
532}
533
534static bool ads_cleanup_expired_creds(krb5_context context,
535 krb5_ccache ccache,
536 krb5_creds *credsp)
537{
538 krb5_error_code retval;
539 const char *cc_type = krb5_cc_get_type(context, ccache);
540
541 DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
542 cc_type, krb5_cc_get_name(context, ccache),
543 http_timestring(talloc_tos(), credsp->times.endtime)));
544
545 /* we will probably need new tickets if the current ones
546 will expire within 10 seconds.
547 */
548 if (credsp->times.endtime >= (time(NULL) + 10))
549 return False;
550
551 /* heimdal won't remove creds from a file ccache, and
552 perhaps we shouldn't anyway, since internally we
553 use memory ccaches, and a FILE one probably means that
554 we're using creds obtained outside of our exectuable
555 */
556 if (strequal(cc_type, "FILE")) {
557 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
558 return False;
559 }
560
561 retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
562 if (retval) {
563 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
564 error_message(retval)));
565 /* If we have an error in this, we want to display it,
566 but continue as though we deleted it */
567 }
568 return True;
569}
570
571/* Allocate and setup the auth context into the state we need. */
572
573static krb5_error_code setup_auth_context(krb5_context context,
574 krb5_auth_context *auth_context)
575{
576 krb5_error_code retval;
577
578 retval = krb5_auth_con_init(context, auth_context );
579 if (retval) {
580 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
581 error_message(retval)));
582 return retval;
583 }
584
585 /* Ensure this is an addressless ticket. */
586 retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
587 if (retval) {
588 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
589 error_message(retval)));
590 }
591
592 return retval;
593}
594
595static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
596 uint32_t gss_flags)
597{
598 unsigned int orig_length = in_data->length;
599 unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
600 char *gss_cksum = NULL;
601
602 if (orig_length) {
603 /* Extra length field for delgated ticket. */
604 base_cksum_size += 4;
605 }
606
607 if ((unsigned int)base_cksum_size + orig_length <
608 (unsigned int)base_cksum_size) {
609 return EINVAL;
610 }
611
612 gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
613 if (gss_cksum == NULL) {
614 return ENOMEM;
615 }
616
617 memset(gss_cksum, '\0', base_cksum_size + orig_length);
618 SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
619
620 /*
621 * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
622 * This matches the behavior of heimdal and mit.
623 *
624 * And it is needed to work against some closed source
625 * SMB servers.
626 *
627 * See bug #7883
628 */
629 memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
630
631 SIVAL(gss_cksum, 20, gss_flags);
632
633 if (orig_length) {
634 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
635 SSVAL(gss_cksum, 26, orig_length);
636 /* Copy the kerberos KRB_CRED data */
637 memcpy(gss_cksum + 28, in_data->data, orig_length);
638 free(in_data->data);
639 in_data->data = NULL;
640 in_data->length = 0;
641 }
642 in_data->data = gss_cksum;
643 in_data->length = base_cksum_size + orig_length;
644 return 0;
645}
646
647/*
648 we can't use krb5_mk_req because w2k wants the service to be in a particular format
649*/
650static krb5_error_code ads_krb5_mk_req(krb5_context context,
651 krb5_auth_context *auth_context,
652 const krb5_flags ap_req_options,
653 const char *principal,
654 krb5_ccache ccache,
655 krb5_data *outbuf,
656 time_t *expire_time,
657 const char *impersonate_princ_s)
658{
659 krb5_error_code retval;
660 krb5_principal server;
661 krb5_principal impersonate_princ = NULL;
662 krb5_creds * credsp;
663 krb5_creds creds;
664 krb5_data in_data;
665 bool creds_ready = False;
666 int i = 0, maxtries = 3;
667 uint32_t gss_flags = 0;
668
669 ZERO_STRUCT(in_data);
670
671 retval = smb_krb5_parse_name(context, principal, &server);
672 if (retval) {
673 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
674 return retval;
675 }
676
677 if (impersonate_princ_s) {
678 retval = smb_krb5_parse_name(context, impersonate_princ_s,
679 &impersonate_princ);
680 if (retval) {
681 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
682 goto cleanup_princ;
683 }
684 }
685
686 /* obtain ticket & session key */
687 ZERO_STRUCT(creds);
688 if ((retval = krb5_copy_principal(context, server, &creds.server))) {
689 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
690 error_message(retval)));
691 goto cleanup_princ;
692 }
693
694 if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
695 /* This can commonly fail on smbd startup with no ticket in the cache.
696 * Report at higher level than 1. */
697 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
698 error_message(retval)));
699 goto cleanup_creds;
700 }
701
702 while (!creds_ready && (i < maxtries)) {
703
704 if ((retval = smb_krb5_get_credentials(context, ccache,
705 creds.client,
706 creds.server,
707 impersonate_princ,
708 &credsp))) {
709 DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
710 principal, error_message(retval)));
711 goto cleanup_creds;
712 }
713
714 /* cope with ticket being in the future due to clock skew */
715 if ((unsigned)credsp->times.starttime > time(NULL)) {
716 time_t t = time(NULL);
717 int time_offset =(int)((unsigned)credsp->times.starttime-t);
718 DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
719 krb5_set_real_time(context, t + time_offset + 1, 0);
720 }
721
722 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
723 creds_ready = True;
724 }
725
726 i++;
727 }
728
729 DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
730 principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
731 http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
732 (unsigned)credsp->times.endtime));
733
734 if (expire_time) {
735 *expire_time = (time_t)credsp->times.endtime;
736 }
737
738 /* Allocate the auth_context. */
739 retval = setup_auth_context(context, auth_context);
740 if (retval) {
741 DEBUG(1,("setup_auth_context failed (%s)\n",
742 error_message(retval)));
743 goto cleanup_creds;
744 }
745
746#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)
747 if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
748 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
749 as part of the kerberos exchange. */
750
751 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n") );
752
753 retval = krb5_auth_con_setuseruserkey(context,
754 *auth_context,
755 &credsp->keyblock );
756 if (retval) {
757 DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
758 error_message(retval)));
759 goto cleanup_creds;
760 }
761
762 /* Must use a subkey for forwarded tickets. */
763 retval = krb5_auth_con_setflags(context,
764 *auth_context,
765 KRB5_AUTH_CONTEXT_USE_SUBKEY);
766 if (retval) {
767 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
768 error_message(retval)));
769 goto cleanup_creds;
770 }
771
772 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
773 *auth_context, /* Authentication context [in] */
774 CONST_DISCARD(char *, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
775 credsp->client, /* Client principal for the tgt [in] */
776 credsp->server, /* Server principal for the tgt [in] */
777 ccache, /* Credential cache to use for storage [in] */
778 1, /* Turn on for "Forwardable ticket" [in] */
779 &in_data ); /* Resulting response [out] */
780
781 if (retval) {
782 DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
783 error_message( retval ) ) );
784
785 /*
786 * This is not fatal. Delete the *auth_context and continue
787 * with krb5_mk_req_extended to get a non-forwardable ticket.
788 */
789
790 if (in_data.data) {
791 free( in_data.data );
792 in_data.data = NULL;
793 in_data.length = 0;
794 }
795 krb5_auth_con_free(context, *auth_context);
796 *auth_context = NULL;
797 retval = setup_auth_context(context, auth_context);
798 if (retval) {
799 DEBUG(1,("setup_auth_context failed (%s)\n",
800 error_message(retval)));
801 goto cleanup_creds;
802 }
803 } else {
804 /* We got a delegated ticket. */
805 gss_flags |= GSS_C_DELEG_FLAG;
806 }
807 }
808
809 /* Frees and reallocates in_data into a GSS checksum blob. */
810 retval = create_gss_checksum(&in_data, gss_flags);
811 if (retval) {
812 goto cleanup_data;
813 }
814
815 /* We always want GSS-checksum types. */
816 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
817 if (retval) {
818 DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
819 error_message(retval)));
820 goto cleanup_data;
821 }
822#endif
823
824 retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
825 &in_data, credsp, outbuf);
826 if (retval) {
827 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
828 error_message(retval)));
829 }
830
831cleanup_data:
832 if (in_data.data) {
833 free( in_data.data );
834 in_data.length = 0;
835 }
836
837 krb5_free_creds(context, credsp);
838
839cleanup_creds:
840 krb5_free_cred_contents(context, &creds);
841
842cleanup_princ:
843 krb5_free_principal(context, server);
844 if (impersonate_princ) {
845 krb5_free_principal(context, impersonate_princ);
846 }
847
848 return retval;
849}
850
851/*
852 get a kerberos5 ticket for the given service
853*/
854int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
855 const char *principal, time_t time_offset,
856 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
857 uint32_t extra_ap_opts, const char *ccname,
858 time_t *tgs_expire,
859 const char *impersonate_princ_s)
860
861{
862 krb5_error_code retval;
863 krb5_data packet;
864 krb5_context context = NULL;
865 krb5_ccache ccdef = NULL;
866 krb5_auth_context auth_context = NULL;
867 krb5_enctype enc_types[] = {
868 ENCTYPE_ARCFOUR_HMAC,
869 ENCTYPE_DES_CBC_MD5,
870 ENCTYPE_DES_CBC_CRC,
871 ENCTYPE_NULL};
872
873 initialize_krb5_error_table();
874 retval = krb5_init_context(&context);
875 if (retval) {
876 DEBUG(1, ("krb5_init_context failed (%s)\n",
877 error_message(retval)));
878 goto failed;
879 }
880
881 if (time_offset != 0) {
882 krb5_set_real_time(context, time(NULL) + time_offset, 0);
883 }
884
885 if ((retval = krb5_cc_resolve(context, ccname ?
886 ccname : krb5_cc_default_name(context), &ccdef))) {
887 DEBUG(1, ("krb5_cc_default failed (%s)\n",
888 error_message(retval)));
889 goto failed;
890 }
891
892 if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
893 DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
894 error_message(retval)));
895 goto failed;
896 }
897
898 retval = ads_krb5_mk_req(context, &auth_context,
899 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
900 principal, ccdef, &packet,
901 tgs_expire, impersonate_princ_s);
902 if (retval) {
903 goto failed;
904 }
905
906 get_krb5_smb_session_key(mem_ctx, context, auth_context,
907 session_key_krb5, false);
908
909 *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
910
911 kerberos_free_data_contents(context, &packet);
912
913failed:
914
915 if (context) {
916 if (ccdef)
917 krb5_cc_close(context, ccdef);
918 if (auth_context)
919 krb5_auth_con_free(context, auth_context);
920 krb5_free_context(context);
921 }
922
923 return retval;
924}
925
926bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
927 krb5_context context,
928 krb5_auth_context auth_context,
929 DATA_BLOB *session_key, bool remote)
930{
931 krb5_keyblock *skey = NULL;
932 krb5_error_code err = 0;
933 bool ret = false;
934
935 if (remote) {
936 err = krb5_auth_con_getremotesubkey(context,
937 auth_context, &skey);
938 } else {
939 err = krb5_auth_con_getlocalsubkey(context,
940 auth_context, &skey);
941 }
942
943 if (err || skey == NULL) {
944 DEBUG(10, ("KRB5 error getting session key %d\n", err));
945 goto done;
946 }
947
948 DEBUG(10, ("Got KRB5 session key of length %d\n",
949 (int)KRB5_KEY_LENGTH(skey)));
950
951 *session_key = data_blob_talloc(mem_ctx,
952 KRB5_KEY_DATA(skey),
953 KRB5_KEY_LENGTH(skey));
954 dump_data_pw("KRB5 Session Key:\n",
955 session_key->data,
956 session_key->length);
957
958 ret = true;
959
960done:
961 if (skey) {
962 krb5_free_keyblock(context, skey);
963 }
964
965 return ret;
966}
967
968
969#if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
970 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
971
972 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
973{
974 static krb5_data kdata;
975
976 kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
977 kdata.length = strlen((const char *)kdata.data);
978 return &kdata;
979}
980#endif
981
982 krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
983{
984/* Try krb5_free_keytab_entry_contents first, since
985 * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
986 * krb5_kt_free_entry but only has a prototype for the first, while the
987 * second is considered private.
988 */
989#if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
990 return krb5_free_keytab_entry_contents(context, kt_entry);
991#elif defined(HAVE_KRB5_KT_FREE_ENTRY)
992 return krb5_kt_free_entry(context, kt_entry);
993#else
994#error UNKNOWN_KT_FREE_FUNCTION
995#endif
996}
997
998 void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
999 struct PAC_SIGNATURE_DATA *sig)
1000{
1001#ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
1002 cksum->cksumtype = (krb5_cksumtype)sig->type;
1003 cksum->checksum.length = sig->signature.length;
1004 cksum->checksum.data = sig->signature.data;
1005#else
1006 cksum->checksum_type = (krb5_cksumtype)sig->type;
1007 cksum->length = sig->signature.length;
1008 cksum->contents = sig->signature.data;
1009#endif
1010}
1011
1012 krb5_error_code smb_krb5_verify_checksum(krb5_context context,
1013 const krb5_keyblock *keyblock,
1014 krb5_keyusage usage,
1015 krb5_checksum *cksum,
1016 uint8 *data,
1017 size_t length)
1018{
1019 krb5_error_code ret;
1020
1021 /* verify the checksum */
1022
1023 /* welcome to the wonderful world of samba's kerberos abstraction layer:
1024 *
1025 * function heimdal 0.6.1rc3 heimdal 0.7 MIT krb 1.4.2
1026 * -----------------------------------------------------------------------------
1027 * krb5_c_verify_checksum - works works
1028 * krb5_verify_checksum works (6 args) works (6 args) broken (7 args)
1029 */
1030
1031#if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
1032 {
1033 krb5_boolean checksum_valid = False;
1034 krb5_data input;
1035
1036 input.data = (char *)data;
1037 input.length = length;
1038
1039 ret = krb5_c_verify_checksum(context,
1040 keyblock,
1041 usage,
1042 &input,
1043 cksum,
1044 &checksum_valid);
1045 if (ret) {
1046 DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
1047 error_message(ret)));
1048 return ret;
1049 }
1050
1051 if (!checksum_valid)
1052 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1053 }
1054
1055#elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
1056
1057 /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
1058 * without enctype and it ignores any key_usage types - Guenther */
1059
1060 {
1061
1062 krb5_crypto crypto;
1063 ret = krb5_crypto_init(context,
1064 keyblock,
1065 0,
1066 &crypto);
1067 if (ret) {
1068 DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
1069 error_message(ret)));
1070 return ret;
1071 }
1072
1073 ret = krb5_verify_checksum(context,
1074 crypto,
1075 usage,
1076 data,
1077 length,
1078 cksum);
1079
1080 krb5_crypto_destroy(context, crypto);
1081 }
1082
1083#else
1084#error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
1085#endif
1086
1087 return ret;
1088}
1089
1090 time_t get_authtime_from_tkt(krb5_ticket *tkt)
1091{
1092#if defined(HAVE_KRB5_TKT_ENC_PART2)
1093 return tkt->enc_part2->times.authtime;
1094#else
1095 return tkt->ticket.authtime;
1096#endif
1097}
1098
1099#ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1100static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
1101{
1102#ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
1103 if (ap_req->ticket->enc_part.kvno)
1104 return ap_req->ticket->enc_part.kvno;
1105#else /* Heimdal */
1106 if (ap_req->ticket.enc_part.kvno)
1107 return *ap_req->ticket.enc_part.kvno;
1108#endif
1109 return 0;
1110}
1111
1112static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
1113{
1114#ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
1115 return ap_req->ticket.enc_part.etype;
1116#else /* MIT */
1117 return ap_req->ticket->enc_part.enctype;
1118#endif
1119}
1120#endif /* HAVE_KRB5_DECODE_AP_REQ */
1121
1122static krb5_error_code
1123get_key_from_keytab(krb5_context context,
1124 krb5_const_principal server,
1125 krb5_enctype enctype,
1126 krb5_kvno kvno,
1127 krb5_keyblock **out_key)
1128{
1129 krb5_keytab_entry entry;
1130 krb5_error_code ret;
1131 krb5_keytab keytab;
1132 char *name = NULL;
1133 krb5_keyblock *keyp;
1134
1135 /* We have to open a new keytab handle here, as MIT does
1136 an implicit open/getnext/close on krb5_kt_get_entry. We
1137 may be in the middle of a keytab enumeration when this is
1138 called. JRA. */
1139
1140 ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1141 if (ret) {
1142 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1143 return ret;
1144 }
1145
1146 if ( DEBUGLEVEL >= 10 ) {
1147 if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) {
1148 DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1149 kvno, enctype, name));
1150 TALLOC_FREE(name);
1151 }
1152 }
1153
1154 ret = krb5_kt_get_entry(context,
1155 keytab,
1156 server,
1157 kvno,
1158 enctype,
1159 &entry);
1160
1161 if (ret) {
1162 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1163 goto out;
1164 }
1165
1166 keyp = KRB5_KT_KEY(&entry);
1167
1168 ret = krb5_copy_keyblock(context, keyp, out_key);
1169 if (ret) {
1170 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1171 goto out;
1172 }
1173
1174 smb_krb5_kt_free_entry(context, &entry);
1175
1176out:
1177 krb5_kt_close(context, keytab);
1178 return ret;
1179}
1180
1181/* Prototypes */
1182
1183 krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1184 const krb5_data *inbuf,
1185 krb5_kvno *kvno,
1186 krb5_enctype *enctype)
1187{
1188#ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1189 {
1190 krb5_error_code ret;
1191 krb5_ap_req ap_req;
1192
1193 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1194 if (ret)
1195 return ret;
1196
1197 *kvno = get_kvno_from_ap_req(&ap_req);
1198 *enctype = get_enctype_from_ap_req(&ap_req);
1199
1200 free_AP_REQ(&ap_req);
1201 return 0;
1202 }
1203#endif
1204
1205 /* Possibly not an appropriate error code. */
1206 return KRB5KDC_ERR_BADOPTION;
1207}
1208
1209 krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1210 krb5_auth_context *auth_context,
1211 const krb5_data *inbuf,
1212 krb5_const_principal server,
1213 krb5_keytab keytab,
1214 krb5_flags *ap_req_options,
1215 krb5_ticket **ticket,
1216 krb5_keyblock **keyblock)
1217{
1218 krb5_error_code ret;
1219 krb5_kvno kvno;
1220 krb5_enctype enctype;
1221 krb5_keyblock *local_keyblock;
1222
1223 ret = krb5_rd_req(context,
1224 auth_context,
1225 inbuf,
1226 server,
1227 keytab,
1228 ap_req_options,
1229 ticket);
1230 if (ret) {
1231 return ret;
1232 }
1233
1234#ifdef KRB5_TICKET_HAS_KEYINFO
1235 enctype = (*ticket)->enc_part.enctype;
1236 kvno = (*ticket)->enc_part.kvno;
1237#else
1238 ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1239 if (ret) {
1240 return ret;
1241 }
1242#endif
1243
1244 ret = get_key_from_keytab(context,
1245 server,
1246 enctype,
1247 kvno,
1248 &local_keyblock);
1249 if (ret) {
1250 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1251 goto out;
1252 }
1253
1254out:
1255 if (ret && local_keyblock != NULL) {
1256 krb5_free_keyblock(context, local_keyblock);
1257 } else {
1258 *keyblock = local_keyblock;
1259 }
1260
1261 return ret;
1262}
1263
1264 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1265 const char *name,
1266 krb5_principal *principal)
1267{
1268#ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1269 return smb_krb5_parse_name_norealm_conv(context, name, principal);
1270#endif
1271
1272 /* we are cheating here because parse_name will in fact set the realm.
1273 * We don't care as the only caller of smb_krb5_parse_name_norealm
1274 * ignores the realm anyway when calling
1275 * smb_krb5_principal_compare_any_realm later - Guenther */
1276
1277 return smb_krb5_parse_name(context, name, principal);
1278}
1279
1280 bool smb_krb5_principal_compare_any_realm(krb5_context context,
1281 krb5_const_principal princ1,
1282 krb5_const_principal princ2)
1283{
1284#ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1285
1286 return krb5_principal_compare_any_realm(context, princ1, princ2);
1287
1288/* krb5_princ_size is a macro in MIT */
1289#elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1290
1291 int i, len1, len2;
1292 const krb5_data *p1, *p2;
1293
1294 len1 = krb5_princ_size(context, princ1);
1295 len2 = krb5_princ_size(context, princ2);
1296
1297 if (len1 != len2)
1298 return False;
1299
1300 for (i = 0; i < len1; i++) {
1301
1302 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1303 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1304
1305 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1306 return False;
1307 }
1308
1309 return True;
1310#else
1311#error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1312#endif
1313}
1314
1315 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, /* FILE:/tmp/krb5cc_0 */
1316 const char *client_string, /* gd@BER.SUSE.DE */
1317 const char *service_string, /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1318 time_t *expire_time)
1319{
1320 krb5_error_code ret;
1321 krb5_context context = NULL;
1322 krb5_ccache ccache = NULL;
1323 krb5_principal client = NULL;
1324 krb5_creds creds, creds_in, *creds_out = NULL;
1325
1326 ZERO_STRUCT(creds);
1327 ZERO_STRUCT(creds_in);
1328
1329 initialize_krb5_error_table();
1330 ret = krb5_init_context(&context);
1331 if (ret) {
1332 goto done;
1333 }
1334
1335 if (!ccache_string) {
1336 ccache_string = krb5_cc_default_name(context);
1337 }
1338
1339 if (!ccache_string) {
1340 ret = EINVAL;
1341 goto done;
1342 }
1343
1344 DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1345
1346 /* FIXME: we should not fall back to defaults */
1347 ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1348 if (ret) {
1349 goto done;
1350 }
1351
1352 if (client_string) {
1353 ret = smb_krb5_parse_name(context, client_string, &client);
1354 if (ret) {
1355 goto done;
1356 }
1357 } else {
1358 ret = krb5_cc_get_principal(context, ccache, &client);
1359 if (ret) {
1360 goto done;
1361 }
1362 }
1363
1364#ifdef HAVE_KRB5_GET_RENEWED_CREDS /* MIT */
1365 {
1366 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1367 if (ret) {
1368 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1369 goto done;
1370 }
1371 }
1372#elif defined(HAVE_KRB5_GET_KDC_CRED) /* Heimdal */
1373 {
1374 krb5_kdc_flags flags;
1375 krb5_realm *client_realm = NULL;
1376
1377 ret = krb5_copy_principal(context, client, &creds_in.client);
1378 if (ret) {
1379 goto done;
1380 }
1381
1382 if (service_string) {
1383 ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1384 if (ret) {
1385 goto done;
1386 }
1387 } else {
1388 /* build tgt service by default */
1389 client_realm = krb5_princ_realm(context, creds_in.client);
1390 if (!client_realm) {
1391 ret = ENOMEM;
1392 goto done;
1393 }
1394 ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1395 if (ret) {
1396 goto done;
1397 }
1398 }
1399
1400 flags.i = 0;
1401 flags.b.renewable = flags.b.renew = True;
1402
1403 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1404 if (ret) {
1405 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1406 goto done;
1407 }
1408
1409 creds = *creds_out;
1410 }
1411#else
1412#error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1413#endif
1414
1415 /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1416 ret = krb5_cc_initialize(context, ccache, client);
1417 if (ret) {
1418 goto done;
1419 }
1420
1421 ret = krb5_cc_store_cred(context, ccache, &creds);
1422
1423 if (expire_time) {
1424 *expire_time = (time_t) creds.times.endtime;
1425 }
1426
1427done:
1428 krb5_free_cred_contents(context, &creds_in);
1429
1430 if (creds_out) {
1431 krb5_free_creds(context, creds_out);
1432 } else {
1433 krb5_free_cred_contents(context, &creds);
1434 }
1435
1436 if (client) {
1437 krb5_free_principal(context, client);
1438 }
1439 if (ccache) {
1440 krb5_cc_close(context, ccache);
1441 }
1442 if (context) {
1443 krb5_free_context(context);
1444 }
1445
1446 return ret;
1447}
1448
1449 krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1450{
1451 krb5_error_code ret = 0;
1452 if (addr == NULL) {
1453 return ret;
1454 }
1455#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1456 krb5_free_addresses(context, addr->addrs);
1457#elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1458 ret = krb5_free_addresses(context, addr->addrs);
1459 SAFE_FREE(addr->addrs);
1460#endif
1461 SAFE_FREE(addr);
1462 addr = NULL;
1463 return ret;
1464}
1465
1466 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1467{
1468 krb5_error_code ret = 0;
1469 nstring buf;
1470#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1471 krb5_address **addrs = NULL;
1472#elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1473 krb5_addresses *addrs = NULL;
1474#endif
1475
1476 *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1477 if (*kerb_addr == NULL) {
1478 return ENOMEM;
1479 }
1480
1481 put_name(buf, global_myname(), ' ', 0x20);
1482
1483#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1484 {
1485 int num_addr = 2;
1486
1487 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1488 if (addrs == NULL) {
1489 SAFE_FREE(*kerb_addr);
1490 return ENOMEM;
1491 }
1492
1493 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1494
1495 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1496 if (addrs[0] == NULL) {
1497 SAFE_FREE(addrs);
1498 SAFE_FREE(*kerb_addr);
1499 return ENOMEM;
1500 }
1501
1502 addrs[0]->magic = KV5M_ADDRESS;
1503 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1504 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1505 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1506 if (addrs[0]->contents == NULL) {
1507 SAFE_FREE(addrs[0]);
1508 SAFE_FREE(addrs);
1509 SAFE_FREE(*kerb_addr);
1510 return ENOMEM;
1511 }
1512
1513 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1514
1515 addrs[1] = NULL;
1516 }
1517#elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1518 {
1519 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1520 if (addrs == NULL) {
1521 SAFE_FREE(*kerb_addr);
1522 return ENOMEM;
1523 }
1524
1525 memset(addrs, 0, sizeof(krb5_addresses));
1526
1527 addrs->len = 1;
1528 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1529 if (addrs->val == NULL) {
1530 SAFE_FREE(addrs);
1531 SAFE_FREE(kerb_addr);
1532 return ENOMEM;
1533 }
1534
1535 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1536 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1537 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1538 if (addrs->val[0].address.data == NULL) {
1539 SAFE_FREE(addrs->val);
1540 SAFE_FREE(addrs);
1541 SAFE_FREE(*kerb_addr);
1542 return ENOMEM;
1543 }
1544
1545 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1546 }
1547#else
1548#error UNKNOWN_KRB5_ADDRESS_FORMAT
1549#endif
1550 (*kerb_addr)->addrs = addrs;
1551
1552 return ret;
1553}
1554
1555 void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1556{
1557#ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1558 krb5_free_error_contents(context, krberror);
1559#else /* MIT */
1560 krb5_free_error(context, krberror);
1561#endif
1562}
1563
1564 krb5_error_code handle_krberror_packet(krb5_context context,
1565 krb5_data *packet)
1566{
1567 krb5_error_code ret;
1568 bool got_error_code = False;
1569
1570 DEBUG(10,("handle_krberror_packet: got error packet\n"));
1571
1572#ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1573 {
1574 krb5_error krberror;
1575
1576 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1577 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1578 error_message(ret)));
1579 return ret;
1580 }
1581
1582 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1583 ret = (krb5_error_code) krberror.error_code;
1584 got_error_code = True;
1585 }
1586
1587 smb_krb5_free_error(context, &krberror);
1588 }
1589#else /* MIT */
1590 {
1591 krb5_error *krberror;
1592
1593 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1594 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1595 error_message(ret)));
1596 return ret;
1597 }
1598
1599 if (krberror->e_data.data == NULL) {
1600#if defined(ERROR_TABLE_BASE_krb5)
1601 ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1602#else
1603 ret = (krb5_error_code)krberror->error;
1604#endif
1605 got_error_code = True;
1606 }
1607 smb_krb5_free_error(context, krberror);
1608 }
1609#endif
1610 if (got_error_code) {
1611 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1612 error_message(ret), ret));
1613 }
1614 return ret;
1615}
1616
1617 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1618 krb5_get_init_creds_opt **opt)
1619{
1620#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1621 /* Heimdal or modern MIT version */
1622 return krb5_get_init_creds_opt_alloc(context, opt);
1623#else
1624 /* Historical MIT version */
1625 krb5_get_init_creds_opt *my_opt;
1626
1627 *opt = NULL;
1628
1629 if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1630 return ENOMEM;
1631 }
1632
1633 krb5_get_init_creds_opt_init(my_opt);
1634
1635 *opt = my_opt;
1636 return 0;
1637#endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC */
1638}
1639
1640 void smb_krb5_get_init_creds_opt_free(krb5_context context,
1641 krb5_get_init_creds_opt *opt)
1642{
1643#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1644
1645#ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1646 /* Modern MIT or Heimdal version */
1647 krb5_get_init_creds_opt_free(context, opt);
1648#else
1649 /* Heimdal version */
1650 krb5_get_init_creds_opt_free(opt);
1651#endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1652
1653#else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1654 /* Historical MIT version */
1655 SAFE_FREE(opt);
1656 opt = NULL;
1657#endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1658}
1659
1660 krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1661{
1662 return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1663}
1664
1665
1666/* caller needs to free etype_s */
1667 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1668 krb5_enctype enctype,
1669 char **etype_s)
1670{
1671#ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1672 return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1673#elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1674 char buf[256];
1675 krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1676 if (ret) {
1677 return ret;
1678 }
1679 *etype_s = SMB_STRDUP(buf);
1680 if (!*etype_s) {
1681 return ENOMEM;
1682 }
1683 return ret;
1684#else
1685#error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1686#endif
1687}
1688
1689 krb5_error_code smb_krb5_mk_error(krb5_context context,
1690 krb5_error_code error_code,
1691 const krb5_principal server,
1692 krb5_data *reply)
1693{
1694#ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1695 /*
1696 * The MIT interface is *terrible*.
1697 * We have to construct this ourselves...
1698 */
1699 krb5_error e;
1700
1701 memset(&e, 0, sizeof(e));
1702 krb5_us_timeofday(context, &e.stime, &e.susec);
1703 e.server = server;
1704#if defined(krb5_err_base)
1705 e.error = error_code - krb5_err_base;
1706#elif defined(ERROR_TABLE_BASE_krb5)
1707 e.error = error_code - ERROR_TABLE_BASE_krb5;
1708#else
1709 e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1710#endif
1711
1712 return krb5_mk_error(context, &e, reply);
1713#else /* Heimdal. */
1714 return krb5_mk_error(context,
1715 error_code,
1716 NULL,
1717 NULL, /* e_data */
1718 NULL,
1719 server,
1720 NULL,
1721 NULL,
1722 reply);
1723#endif
1724}
1725
1726/**********************************************************************
1727 * Open a krb5 keytab with flags, handles readonly or readwrite access and
1728 * allows to process non-default keytab names.
1729 * @param context krb5_context
1730 * @param keytab_name_req string
1731 * @param write_access bool if writable keytab is required
1732 * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1733 * @return krb5_error_code
1734**********************************************************************/
1735
1736/* This MAX_NAME_LEN is a constant defined in krb5.h */
1737#ifndef MAX_KEYTAB_NAME_LEN
1738#define MAX_KEYTAB_NAME_LEN 1100
1739#endif
1740
1741 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1742 const char *keytab_name_req,
1743 bool write_access,
1744 krb5_keytab *keytab)
1745{
1746 krb5_error_code ret = 0;
1747 TALLOC_CTX *mem_ctx;
1748 char keytab_string[MAX_KEYTAB_NAME_LEN];
1749 char *kt_str = NULL;
1750 bool found_valid_name = False;
1751 const char *pragma = "FILE";
1752 const char *tmp = NULL;
1753
1754 if (!write_access && !keytab_name_req) {
1755 /* caller just wants to read the default keytab readonly, so be it */
1756 return krb5_kt_default(context, keytab);
1757 }
1758
1759 mem_ctx = talloc_init("smb_krb5_open_keytab");
1760 if (!mem_ctx) {
1761 return ENOMEM;
1762 }
1763
1764#ifdef HAVE_WRFILE_KEYTAB
1765 if (write_access) {
1766 pragma = "WRFILE";
1767 }
1768#endif
1769
1770 if (keytab_name_req) {
1771
1772 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1773 ret = KRB5_CONFIG_NOTENUFSPACE;
1774 goto out;
1775 }
1776
1777 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1778 (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1779 tmp = keytab_name_req;
1780 goto resolve;
1781 }
1782
1783 if (keytab_name_req[0] != '/') {
1784 ret = KRB5_KT_BADNAME;
1785 goto out;
1786 }
1787
1788 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1789 if (!tmp) {
1790 ret = ENOMEM;
1791 goto out;
1792 }
1793
1794 goto resolve;
1795 }
1796
1797 /* we need to handle more complex keytab_strings, like:
1798 * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1799
1800 ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1801 if (ret) {
1802 goto out;
1803 }
1804
1805 DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1806
1807 tmp = talloc_strdup(mem_ctx, keytab_string);
1808 if (!tmp) {
1809 ret = ENOMEM;
1810 goto out;
1811 }
1812
1813 if (strncmp(tmp, "ANY:", 4) == 0) {
1814 tmp += 4;
1815 }
1816
1817 memset(&keytab_string, '\0', sizeof(keytab_string));
1818
1819 while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1820 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1821 found_valid_name = True;
1822 tmp = kt_str;
1823 tmp += 7;
1824 }
1825
1826 if (strncmp(kt_str, "FILE:", 5) == 0) {
1827 found_valid_name = True;
1828 tmp = kt_str;
1829 tmp += 5;
1830 }
1831
1832 if (tmp[0] == '/') {
1833 /* Treat as a FILE: keytab definition. */
1834 found_valid_name = true;
1835 }
1836
1837 if (found_valid_name) {
1838 if (tmp[0] != '/') {
1839 ret = KRB5_KT_BADNAME;
1840 goto out;
1841 }
1842
1843 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1844 if (!tmp) {
1845 ret = ENOMEM;
1846 goto out;
1847 }
1848 break;
1849 }
1850 }
1851
1852 if (!found_valid_name) {
1853 ret = KRB5_KT_UNKNOWN_TYPE;
1854 goto out;
1855 }
1856
1857 resolve:
1858 DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1859 ret = krb5_kt_resolve(context, tmp, keytab);
1860
1861 out:
1862 TALLOC_FREE(mem_ctx);
1863 return ret;
1864}
1865
1866krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1867 krb5_context context,
1868 krb5_keytab keytab,
1869 const char **keytab_name)
1870{
1871 char keytab_string[MAX_KEYTAB_NAME_LEN];
1872 krb5_error_code ret = 0;
1873
1874 ret = krb5_kt_get_name(context, keytab,
1875 keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1876 if (ret) {
1877 return ret;
1878 }
1879
1880 *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1881 if (!*keytab_name) {
1882 return ENOMEM;
1883 }
1884
1885 return ret;
1886}
1887
1888#if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1889 defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1890 defined(HAVE_KRB5_GET_CREDS)
1891static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1892 krb5_ccache ccache,
1893 krb5_principal me,
1894 krb5_principal server,
1895 krb5_principal impersonate_princ,
1896 krb5_creds **out_creds)
1897{
1898 krb5_error_code ret;
1899 krb5_get_creds_opt opt;
1900
1901 ret = krb5_get_creds_opt_alloc(context, &opt);
1902 if (ret) {
1903 goto done;
1904 }
1905 krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1906
1907 if (impersonate_princ) {
1908 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1909 impersonate_princ);
1910 if (ret) {
1911 goto done;
1912 }
1913 }
1914
1915 ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1916 if (ret) {
1917 goto done;
1918 }
1919
1920 done:
1921 if (opt) {
1922 krb5_get_creds_opt_free(context, opt);
1923 }
1924 return ret;
1925}
1926#endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1927
1928#ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1929static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1930 krb5_ccache ccache,
1931 krb5_principal me,
1932 krb5_principal server,
1933 krb5_principal impersonate_princ,
1934 krb5_creds **out_creds)
1935{
1936 krb5_error_code ret;
1937 krb5_creds in_creds;
1938
1939#if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1940krb5_error_code KRB5_CALLCONV
1941krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1942 krb5_ccache ccache, krb5_creds *in_creds,
1943 krb5_data *subject_cert,
1944 krb5_creds **out_creds);
1945#endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1946
1947 ZERO_STRUCT(in_creds);
1948
1949 if (impersonate_princ) {
1950
1951 in_creds.server = me;
1952 in_creds.client = impersonate_princ;
1953
1954 ret = krb5_get_credentials_for_user(context,
1955 0, /* krb5_flags options */
1956 ccache,
1957 &in_creds,
1958 NULL, /* krb5_data *subject_cert */
1959 out_creds);
1960 } else {
1961 in_creds.client = me;
1962 in_creds.server = server;
1963
1964 ret = krb5_get_credentials(context, 0, ccache,
1965 &in_creds, out_creds);
1966 }
1967
1968 return ret;
1969}
1970#endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1971
1972/*
1973 * smb_krb5_get_credentials
1974 *
1975 * @brief Get krb5 credentials for a server
1976 *
1977 * @param[in] context An initialized krb5_context
1978 * @param[in] ccache An initialized krb5_ccache
1979 * @param[in] me The krb5_principal of the caller
1980 * @param[in] server The krb5_principal of the requested service
1981 * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1982 * @param[out] out_creds The returned krb5_creds structure
1983 * @return krb5_error_code
1984 *
1985 */
1986krb5_error_code smb_krb5_get_credentials(krb5_context context,
1987 krb5_ccache ccache,
1988 krb5_principal me,
1989 krb5_principal server,
1990 krb5_principal impersonate_princ,
1991 krb5_creds **out_creds)
1992{
1993 krb5_error_code ret;
1994 krb5_creds *creds = NULL;
1995
1996 *out_creds = NULL;
1997
1998 if (impersonate_princ) {
1999#ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
2000 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
2001#elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
2002 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
2003#else
2004 ret = ENOTSUP;
2005#endif
2006 } else {
2007 krb5_creds in_creds;
2008
2009 ZERO_STRUCT(in_creds);
2010
2011 in_creds.client = me;
2012 in_creds.server = server;
2013
2014 ret = krb5_get_credentials(context, 0, ccache,
2015 &in_creds, &creds);
2016 }
2017 if (ret) {
2018 goto done;
2019 }
2020
2021 if (out_creds) {
2022 *out_creds = creds;
2023 }
2024
2025 done:
2026 if (creds && ret) {
2027 krb5_free_creds(context, creds);
2028 }
2029
2030 return ret;
2031}
2032
2033/*
2034 * smb_krb5_get_creds
2035 *
2036 * @brief Get krb5 credentials for a server
2037 *
2038 * @param[in] server_s The string name of the service
2039 * @param[in] time_offset The offset to the KDCs time in seconds (optional)
2040 * @param[in] cc The krb5 credential cache string name (optional)
2041 * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
2042 * @param[out] creds_p The returned krb5_creds structure
2043 * @return krb5_error_code
2044 *
2045 */
2046krb5_error_code smb_krb5_get_creds(const char *server_s,
2047 time_t time_offset,
2048 const char *cc,
2049 const char *impersonate_princ_s,
2050 krb5_creds **creds_p)
2051{
2052 krb5_error_code ret;
2053 krb5_context context = NULL;
2054 krb5_principal me = NULL;
2055 krb5_principal server = NULL;
2056 krb5_principal impersonate_princ = NULL;
2057 krb5_creds *creds = NULL;
2058 krb5_ccache ccache = NULL;
2059
2060 *creds_p = NULL;
2061
2062 initialize_krb5_error_table();
2063 ret = krb5_init_context(&context);
2064 if (ret) {
2065 goto done;
2066 }
2067
2068 if (time_offset != 0) {
2069 krb5_set_real_time(context, time(NULL) + time_offset, 0);
2070 }
2071
2072 ret = krb5_cc_resolve(context, cc ? cc :
2073 krb5_cc_default_name(context), &ccache);
2074 if (ret) {
2075 goto done;
2076 }
2077
2078 ret = krb5_cc_get_principal(context, ccache, &me);
2079 if (ret) {
2080 goto done;
2081 }
2082
2083 ret = smb_krb5_parse_name(context, server_s, &server);
2084 if (ret) {
2085 goto done;
2086 }
2087
2088 if (impersonate_princ_s) {
2089 ret = smb_krb5_parse_name(context, impersonate_princ_s,
2090 &impersonate_princ);
2091 if (ret) {
2092 goto done;
2093 }
2094 }
2095
2096 ret = smb_krb5_get_credentials(context, ccache,
2097 me, server, impersonate_princ,
2098 &creds);
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 (creds_p) {
2109 *creds_p = creds;
2110 }
2111
2112 DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
2113 server_s));
2114
2115 if (impersonate_princ_s) {
2116 char *client = NULL;
2117
2118 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
2119 if (ret) {
2120 goto done;
2121 }
2122 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
2123 client));
2124 TALLOC_FREE(client);
2125 }
2126
2127 done:
2128 if (!context) {
2129 return ret;
2130 }
2131
2132 if (creds && ret) {
2133 krb5_free_creds(context, creds);
2134 }
2135 if (server) {
2136 krb5_free_principal(context, server);
2137 }
2138 if (me) {
2139 krb5_free_principal(context, me);
2140 }
2141 if (impersonate_princ) {
2142 krb5_free_principal(context, impersonate_princ);
2143 }
2144 if (ccache) {
2145 krb5_cc_close(context, ccache);
2146 }
2147 krb5_free_context(context);
2148
2149 return ret;
2150}
2151
2152/*
2153 * smb_krb5_principal_get_realm
2154 *
2155 * @brief Get realm of a principal
2156 *
2157 * @param[in] context The krb5_context
2158 * @param[in] principal The principal
2159 * @return pointer to the realm
2160 *
2161 */
2162
2163char *smb_krb5_principal_get_realm(krb5_context context,
2164 krb5_principal principal)
2165{
2166#ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2167 return krb5_principal_get_realm(context, principal);
2168#elif defined(krb5_princ_realm) /* MIT */
2169 krb5_data *realm;
2170 realm = krb5_princ_realm(context, principal);
2171 return (char *)realm->data;
2172#else
2173 return NULL;
2174#endif
2175}
2176
2177#else /* HAVE_KRB5 */
2178 /* this saves a few linking headaches */
2179 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
2180 const char *principal, time_t time_offset,
2181 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
2182 uint32_t extra_ap_opts,
2183 const char *ccname, time_t *tgs_expire,
2184 const char *impersonate_princ_s)
2185{
2186 DEBUG(0,("NO KERBEROS SUPPORT\n"));
2187 return 1;
2188}
2189
2190bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
2191{
2192 DEBUG(0,("NO KERBEROS SUPPORT\n"));
2193 return false;
2194}
2195
2196#endif /* HAVE_KRB5 */
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