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s3:winbindd:cache: fix offline logons with cached credentials (bug #9321)
[Samba/gebeck_regimport.git] / lib / krb5_wrap / krb5_samba.c
blob8037337d6e9bcce33575f75cb6d4bb1e08e267e8
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 "krb5_samba.h"
25 #include "lib/util/asn1.h"
26
27 #ifndef KRB5_AUTHDATA_WIN2K_PAC
28 #define KRB5_AUTHDATA_WIN2K_PAC 128
29 #endif
30
31 #ifndef KRB5_AUTHDATA_IF_RELEVANT
32 #define KRB5_AUTHDATA_IF_RELEVANT 1
33 #endif
34
35 #ifdef HAVE_KRB5
36
37 #define GSSAPI_CHECKSUM 0x8003 /* Checksum type value for Kerberos */
38 #define GSSAPI_BNDLENGTH 16 /* Bind Length (rfc-1964 pg.3) */
39 #define GSSAPI_CHECKSUM_SIZE (4+GSSAPI_BNDLENGTH+4) /* Length of bind length,
40 bind field, flags field. */
41 #define GSS_C_DELEG_FLAG 1
42
43 /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
44 but still has the symbol */
45 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
46 krb5_error_code krb5_auth_con_set_req_cksumtype(
47 krb5_context context,
48 krb5_auth_context auth_context,
49 krb5_cksumtype cksumtype);
50 #endif
51
52 #if !defined(SMB_MALLOC)
53 #undef malloc
54 #define SMB_MALLOC(s) malloc((s))
55 #endif
56
57 #ifndef SMB_STRDUP
58 #define SMB_STRDUP(s) strdup(s)
59 #endif
60
61 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
62
63 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
64
65 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
66 * to krb5_set_default_tgs_ktypes. See
67 * http://lists.samba.org/archive/samba-technical/2006-July/048271.html
68 *
69 * If the MIT libraries are not exporting internal symbols, we will end up in
70 * this branch, which is correct. Otherwise we will continue to use the
71 * internal symbol
72 */
73 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
74 {
75 return krb5_set_default_tgs_enctypes(ctx, enc);
76 }
77
78 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
79
80 /* Heimdal */
81 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
82 {
83 return krb5_set_default_in_tkt_etypes(ctx, enc);
84 }
85
86 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
87
88 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
89
90 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
91 /* HEIMDAL */
92 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
93 {
94 memset(pkaddr, '\0', sizeof(krb5_address));
95 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
96 if (paddr->ss_family == AF_INET6) {
97 pkaddr->addr_type = KRB5_ADDRESS_INET6;
98 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
99 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
100 return true;
101 }
102 #endif
103 if (paddr->ss_family == AF_INET) {
104 pkaddr->addr_type = KRB5_ADDRESS_INET;
105 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
106 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
107 return true;
108 }
109 return false;
110 }
111 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
112 /* MIT */
113 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
114 {
115 memset(pkaddr, '\0', sizeof(krb5_address));
116 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
117 if (paddr->ss_family == AF_INET6) {
118 pkaddr->addrtype = ADDRTYPE_INET6;
119 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
120 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
121 return true;
122 }
123 #endif
124 if (paddr->ss_family == AF_INET) {
125 pkaddr->addrtype = ADDRTYPE_INET;
126 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
127 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
128 return true;
129 }
130 return false;
131 }
132 #else
133 #error UNKNOWN_ADDRTYPE
134 #endif
135
136 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_C_STRING_TO_KEY)
137 /* MIT */
138 int create_kerberos_key_from_string_direct(krb5_context context,
139 krb5_principal host_princ,
140 krb5_data *password,
141 krb5_keyblock *key,
142 krb5_enctype enctype)
143 {
144 int ret = 0;
145 krb5_data salt;
146
147 ret = krb5_principal2salt(context, host_princ, &salt);
148 if (ret) {
149 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
150 return ret;
151 }
152 ret = krb5_c_string_to_key(context, enctype, password, &salt, key);
153 SAFE_FREE(salt.data);
154
155 return ret;
156 }
157 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
158 /* Heimdal */
159 int create_kerberos_key_from_string_direct(krb5_context context,
160 krb5_principal host_princ,
161 krb5_data *password,
162 krb5_keyblock *key,
163 krb5_enctype enctype)
164 {
165 int ret;
166 krb5_salt salt;
167
168 ret = krb5_get_pw_salt(context, host_princ, &salt);
169 if (ret) {
170 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
171 return ret;
172 }
173
174 ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
175 krb5_free_salt(context, salt);
176
177 return ret;
178 }
179 #else
180 #error UNKNOWN_CREATE_KEY_FUNCTIONS
181 #endif
182
183 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
184 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
185 krb5_enctype **enctypes)
186 {
187 return krb5_get_permitted_enctypes(context, enctypes);
188 }
189 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
190 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
191 krb5_enctype **enctypes)
192 {
193 #ifdef HAVE_KRB5_PDU_NONE_DECL
194 return krb5_get_default_in_tkt_etypes(context, KRB5_PDU_NONE, enctypes);
195 #else
196 return krb5_get_default_in_tkt_etypes(context, enctypes);
197 #endif
198 }
199 #else
200 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
201 #endif
202
203 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
204 krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
205 krb5_auth_context auth_context,
206 krb5_keyblock *keyblock)
207 {
208 return krb5_auth_con_setkey(context, auth_context, keyblock);
209 }
210 #endif
211
212 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
213 DATA_BLOB *edata,
214 DATA_BLOB *edata_out)
215 {
216 DATA_BLOB edata_contents;
217 ASN1_DATA *data;
218 int edata_type;
219
220 if (!edata->length) {
221 return false;
222 }
223
224 data = asn1_init(mem_ctx);
225 if (data == NULL) {
226 return false;
227 }
228
229 asn1_load(data, *edata);
230 asn1_start_tag(data, ASN1_SEQUENCE(0));
231 asn1_start_tag(data, ASN1_CONTEXT(1));
232 asn1_read_Integer(data, &edata_type);
233
234 if (edata_type != KRB5_PADATA_PW_SALT) {
235 DEBUG(0,("edata is not of required type %d but of type %d\n",
236 KRB5_PADATA_PW_SALT, edata_type));
237 asn1_free(data);
238 return false;
239 }
240
241 asn1_start_tag(data, ASN1_CONTEXT(2));
242 asn1_read_OctetString(data, talloc_tos(), &edata_contents);
243 asn1_end_tag(data);
244 asn1_end_tag(data);
245 asn1_end_tag(data);
246 asn1_free(data);
247
248 *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
249
250 data_blob_free(&edata_contents);
251
252 return true;
253 }
254
255
256 static bool ads_cleanup_expired_creds(krb5_context context,
257 krb5_ccache ccache,
258 krb5_creds *credsp)
259 {
260 krb5_error_code retval;
261 const char *cc_type = krb5_cc_get_type(context, ccache);
262
263 DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
264 cc_type, krb5_cc_get_name(context, ccache),
265 http_timestring(talloc_tos(), credsp->times.endtime)));
266
267 /* we will probably need new tickets if the current ones
268 will expire within 10 seconds.
269 */
270 if (credsp->times.endtime >= (time(NULL) + 10))
271 return false;
272
273 /* heimdal won't remove creds from a file ccache, and
274 perhaps we shouldn't anyway, since internally we
275 use memory ccaches, and a FILE one probably means that
276 we're using creds obtained outside of our exectuable
277 */
278 if (strequal(cc_type, "FILE")) {
279 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
280 return false;
281 }
282
283 retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
284 if (retval) {
285 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
286 error_message(retval)));
287 /* If we have an error in this, we want to display it,
288 but continue as though we deleted it */
289 }
290 return true;
291 }
292
293 /* Allocate and setup the auth context into the state we need. */
294
295 static krb5_error_code setup_auth_context(krb5_context context,
296 krb5_auth_context *auth_context)
297 {
298 krb5_error_code retval;
299
300 retval = krb5_auth_con_init(context, auth_context );
301 if (retval) {
302 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
303 error_message(retval)));
304 return retval;
305 }
306
307 /* Ensure this is an addressless ticket. */
308 retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
309 if (retval) {
310 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
311 error_message(retval)));
312 }
313
314 return retval;
315 }
316
317 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
318 static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
319 uint32_t gss_flags)
320 {
321 unsigned int orig_length = in_data->length;
322 unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
323 char *gss_cksum = NULL;
324
325 if (orig_length) {
326 /* Extra length field for delgated ticket. */
327 base_cksum_size += 4;
328 }
329
330 if ((unsigned int)base_cksum_size + orig_length <
331 (unsigned int)base_cksum_size) {
332 return EINVAL;
333 }
334
335 gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
336 if (gss_cksum == NULL) {
337 return ENOMEM;
338 }
339
340 memset(gss_cksum, '\0', base_cksum_size + orig_length);
341 SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
342
343 /*
344 * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
345 * This matches the behavior of heimdal and mit.
346 *
347 * And it is needed to work against some closed source
348 * SMB servers.
349 *
350 * See bug #7883
351 */
352 memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
353
354 SIVAL(gss_cksum, 20, gss_flags);
355
356 if (orig_length) {
357 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
358 SSVAL(gss_cksum, 26, orig_length);
359 /* Copy the kerberos KRB_CRED data */
360 memcpy(gss_cksum + 28, in_data->data, orig_length);
361 free(in_data->data);
362 in_data->data = NULL;
363 in_data->length = 0;
364 }
365 in_data->data = gss_cksum;
366 in_data->length = base_cksum_size + orig_length;
367 return 0;
368 }
369 #endif
370
371 /**************************************************************
372 krb5_parse_name that takes a UNIX charset.
373 **************************************************************/
374
375 krb5_error_code smb_krb5_parse_name(krb5_context context,
376 const char *name, /* in unix charset */
377 krb5_principal *principal)
378 {
379 krb5_error_code ret;
380 char *utf8_name;
381 size_t converted_size;
382 TALLOC_CTX *frame = talloc_stackframe();
383
384 if (!push_utf8_talloc(frame, &utf8_name, name, &converted_size)) {
385 talloc_free(frame);
386 return ENOMEM;
387 }
388
389 ret = krb5_parse_name(context, utf8_name, principal);
390 TALLOC_FREE(frame);
391 return ret;
392 }
393
394 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
395 void krb5_free_unparsed_name(krb5_context context, char *val)
396 {
397 SAFE_FREE(val);
398 }
399 #endif
400
401 /**************************************************************
402 krb5_parse_name that returns a UNIX charset name. Must
403 be freed with talloc_free() call.
404 **************************************************************/
405
406 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
407 krb5_context context,
408 krb5_const_principal principal,
409 char **unix_name)
410 {
411 krb5_error_code ret;
412 char *utf8_name;
413 size_t converted_size;
414
415 *unix_name = NULL;
416 ret = krb5_unparse_name(context, principal, &utf8_name);
417 if (ret) {
418 return ret;
419 }
420
421 if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
422 krb5_free_unparsed_name(context, utf8_name);
423 return ENOMEM;
424 }
425 krb5_free_unparsed_name(context, utf8_name);
426 return 0;
427 }
428
429 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
430 const char *name,
431 krb5_principal *principal)
432 {
433 /* we are cheating here because parse_name will in fact set the realm.
434 * We don't care as the only caller of smb_krb5_parse_name_norealm
435 * ignores the realm anyway when calling
436 * smb_krb5_principal_compare_any_realm later - Guenther */
437
438 return smb_krb5_parse_name(context, name, principal);
439 }
440
441 bool smb_krb5_principal_compare_any_realm(krb5_context context,
442 krb5_const_principal princ1,
443 krb5_const_principal princ2)
444 {
445 return krb5_principal_compare_any_realm(context, princ1, princ2);
446 }
447
448 /*
449 we can't use krb5_mk_req because w2k wants the service to be in a particular format
450 */
451 static krb5_error_code ads_krb5_mk_req(krb5_context context,
452 krb5_auth_context *auth_context,
453 const krb5_flags ap_req_options,
454 const char *principal,
455 krb5_ccache ccache,
456 krb5_data *outbuf,
457 time_t *expire_time,
458 const char *impersonate_princ_s)
459 {
460 krb5_error_code retval;
461 krb5_principal server;
462 krb5_principal impersonate_princ = NULL;
463 krb5_creds * credsp;
464 krb5_creds creds;
465 krb5_data in_data;
466 bool creds_ready = false;
467 int i = 0, maxtries = 3;
468
469 ZERO_STRUCT(in_data);
470
471 retval = smb_krb5_parse_name(context, principal, &server);
472 if (retval) {
473 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
474 return retval;
475 }
476
477 if (impersonate_princ_s) {
478 retval = smb_krb5_parse_name(context, impersonate_princ_s,
479 &impersonate_princ);
480 if (retval) {
481 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
482 goto cleanup_princ;
483 }
484 }
485
486 /* obtain ticket & session key */
487 ZERO_STRUCT(creds);
488 if ((retval = krb5_copy_principal(context, server, &creds.server))) {
489 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
490 error_message(retval)));
491 goto cleanup_princ;
492 }
493
494 if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
495 /* This can commonly fail on smbd startup with no ticket in the cache.
496 * Report at higher level than 1. */
497 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
498 error_message(retval)));
499 goto cleanup_creds;
500 }
501
502 while (!creds_ready && (i < maxtries)) {
503
504 if ((retval = smb_krb5_get_credentials(context, ccache,
505 creds.client,
506 creds.server,
507 impersonate_princ,
508 &credsp))) {
509 DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
510 principal, error_message(retval)));
511 goto cleanup_creds;
512 }
513
514 /* cope with ticket being in the future due to clock skew */
515 if ((unsigned)credsp->times.starttime > time(NULL)) {
516 time_t t = time(NULL);
517 int time_offset =(int)((unsigned)credsp->times.starttime-t);
518 DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
519 krb5_set_real_time(context, t + time_offset + 1, 0);
520 }
521
522 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
523 creds_ready = true;
524 }
525
526 i++;
527 }
528
529 DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
530 principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
531 http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
532 (unsigned)credsp->times.endtime));
533
534 if (expire_time) {
535 *expire_time = (time_t)credsp->times.endtime;
536 }
537
538 /* Allocate the auth_context. */
539 retval = setup_auth_context(context, auth_context);
540 if (retval) {
541 DEBUG(1,("setup_auth_context failed (%s)\n",
542 error_message(retval)));
543 goto cleanup_creds;
544 }
545
546 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
547 {
548 uint32_t gss_flags = 0;
549
550 if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
551 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
552 as part of the kerberos exchange. */
553
554 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n") );
555
556 retval = krb5_auth_con_setuseruserkey(context,
557 *auth_context,
558 &credsp->keyblock );
559 if (retval) {
560 DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
561 error_message(retval)));
562 goto cleanup_creds;
563 }
564
565 /* Must use a subkey for forwarded tickets. */
566 retval = krb5_auth_con_setflags(context,
567 *auth_context,
568 KRB5_AUTH_CONTEXT_USE_SUBKEY);
569 if (retval) {
570 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
571 error_message(retval)));
572 goto cleanup_creds;
573 }
574
575 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
576 *auth_context, /* Authentication context [in] */
577 discard_const_p(char, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
578 credsp->client, /* Client principal for the tgt [in] */
579 credsp->server, /* Server principal for the tgt [in] */
580 ccache, /* Credential cache to use for storage [in] */
581 1, /* Turn on for "Forwardable ticket" [in] */
582 &in_data ); /* Resulting response [out] */
583
584 if (retval) {
585 DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
586 error_message( retval ) ) );
587
588 /*
589 * This is not fatal. Delete the *auth_context and continue
590 * with krb5_mk_req_extended to get a non-forwardable ticket.
591 */
592
593 if (in_data.data) {
594 free( in_data.data );
595 in_data.data = NULL;
596 in_data.length = 0;
597 }
598 krb5_auth_con_free(context, *auth_context);
599 *auth_context = NULL;
600 retval = setup_auth_context(context, auth_context);
601 if (retval) {
602 DEBUG(1,("setup_auth_context failed (%s)\n",
603 error_message(retval)));
604 goto cleanup_creds;
605 }
606 } else {
607 /* We got a delegated ticket. */
608 gss_flags |= GSS_C_DELEG_FLAG;
609 }
610 }
611
612 /* Frees and reallocates in_data into a GSS checksum blob. */
613 retval = create_gss_checksum(&in_data, gss_flags);
614 if (retval) {
615 goto cleanup_data;
616 }
617
618 /* We always want GSS-checksum types. */
619 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
620 if (retval) {
621 DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
622 error_message(retval)));
623 goto cleanup_data;
624 }
625 }
626 #endif
627
628 retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
629 &in_data, credsp, outbuf);
630 if (retval) {
631 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
632 error_message(retval)));
633 }
634
635 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
636 cleanup_data:
637 #endif
638
639 if (in_data.data) {
640 free( in_data.data );
641 in_data.length = 0;
642 }
643
644 krb5_free_creds(context, credsp);
645
646 cleanup_creds:
647 krb5_free_cred_contents(context, &creds);
648
649 cleanup_princ:
650 krb5_free_principal(context, server);
651 if (impersonate_princ) {
652 krb5_free_principal(context, impersonate_princ);
653 }
654
655 return retval;
656 }
657
658 void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
659 {
660 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
661 if (pdata->data) {
662 krb5_free_data_contents(context, pdata);
663 }
664 #elif defined(HAVE_KRB5_DATA_FREE)
665 krb5_data_free(context, pdata);
666 #else
667 SAFE_FREE(pdata->data);
668 #endif
669 }
670
671 /*
672 get a kerberos5 ticket for the given service
673 */
674 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
675 const char *principal, time_t time_offset,
676 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
677 uint32_t extra_ap_opts, const char *ccname,
678 time_t *tgs_expire,
679 const char *impersonate_princ_s)
680
681 {
682 krb5_error_code retval;
683 krb5_data packet;
684 krb5_context context = NULL;
685 krb5_ccache ccdef = NULL;
686 krb5_auth_context auth_context = NULL;
687 krb5_enctype enc_types[] = {
688 ENCTYPE_ARCFOUR_HMAC,
689 ENCTYPE_DES_CBC_MD5,
690 ENCTYPE_DES_CBC_CRC,
691 #ifdef HAVE_ENCTYPE_AES128_CTS_HMAC_SHA1_96
692 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
693 #endif
694 #ifdef HAVE_ENCTYPE_AES256_CTS_HMAC_SHA1_96
695 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
696 #endif
697 ENCTYPE_NULL};
698
699 initialize_krb5_error_table();
700 retval = krb5_init_context(&context);
701 if (retval) {
702 DEBUG(1, ("krb5_init_context failed (%s)\n",
703 error_message(retval)));
704 goto failed;
705 }
706
707 if (time_offset != 0) {
708 krb5_set_real_time(context, time(NULL) + time_offset, 0);
709 }
710
711 if ((retval = krb5_cc_resolve(context, ccname ?
712 ccname : krb5_cc_default_name(context), &ccdef))) {
713 DEBUG(1, ("krb5_cc_default failed (%s)\n",
714 error_message(retval)));
715 goto failed;
716 }
717
718 if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
719 DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
720 error_message(retval)));
721 goto failed;
722 }
723
724 retval = ads_krb5_mk_req(context, &auth_context,
725 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
726 principal, ccdef, &packet,
727 tgs_expire, impersonate_princ_s);
728 if (retval) {
729 goto failed;
730 }
731
732 get_krb5_smb_session_key(mem_ctx, context, auth_context,
733 session_key_krb5, false);
734
735 *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
736
737 kerberos_free_data_contents(context, &packet);
738
739 failed:
740
741 if (context) {
742 if (ccdef)
743 krb5_cc_close(context, ccdef);
744 if (auth_context)
745 krb5_auth_con_free(context, auth_context);
746 krb5_free_context(context);
747 }
748
749 return retval;
750 }
751
752 bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
753 krb5_context context,
754 krb5_auth_context auth_context,
755 DATA_BLOB *session_key, bool remote)
756 {
757 krb5_keyblock *skey = NULL;
758 krb5_error_code err = 0;
759 bool ret = false;
760
761 if (remote) {
762 err = krb5_auth_con_getremotesubkey(context,
763 auth_context, &skey);
764 } else {
765 err = krb5_auth_con_getlocalsubkey(context,
766 auth_context, &skey);
767 }
768
769 if (err || skey == NULL) {
770 DEBUG(10, ("KRB5 error getting session key %d\n", err));
771 goto done;
772 }
773
774 DEBUG(10, ("Got KRB5 session key of length %d\n",
775 (int)KRB5_KEY_LENGTH(skey)));
776
777 *session_key = data_blob_talloc(mem_ctx,
778 KRB5_KEY_DATA(skey),
779 KRB5_KEY_LENGTH(skey));
780 dump_data_pw("KRB5 Session Key:\n",
781 session_key->data,
782 session_key->length);
783
784 ret = true;
785
786 done:
787 if (skey) {
788 krb5_free_keyblock(context, skey);
789 }
790
791 return ret;
792 }
793
794
795 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
796 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
797
798 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
799 {
800 static krb5_data kdata;
801
802 kdata.data = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i));
803 kdata.length = strlen((const char *)kdata.data);
804 return &kdata;
805 }
806 #endif
807
808 /* Prototypes */
809
810 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, /* FILE:/tmp/krb5cc_0 */
811 const char *client_string, /* gd@BER.SUSE.DE */
812 const char *service_string, /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
813 time_t *expire_time)
814 {
815 krb5_error_code ret;
816 krb5_context context = NULL;
817 krb5_ccache ccache = NULL;
818 krb5_principal client = NULL;
819 krb5_creds creds, creds_in, *creds_out = NULL;
820
821 ZERO_STRUCT(creds);
822 ZERO_STRUCT(creds_in);
823
824 initialize_krb5_error_table();
825 ret = krb5_init_context(&context);
826 if (ret) {
827 goto done;
828 }
829
830 if (!ccache_string) {
831 ccache_string = krb5_cc_default_name(context);
832 }
833
834 if (!ccache_string) {
835 ret = EINVAL;
836 goto done;
837 }
838
839 DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
840
841 /* FIXME: we should not fall back to defaults */
842 ret = krb5_cc_resolve(context, discard_const_p(char, ccache_string), &ccache);
843 if (ret) {
844 goto done;
845 }
846
847 if (client_string) {
848 ret = smb_krb5_parse_name(context, client_string, &client);
849 if (ret) {
850 goto done;
851 }
852 } else {
853 ret = krb5_cc_get_principal(context, ccache, &client);
854 if (ret) {
855 goto done;
856 }
857 }
858
859 ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string));
860 if (ret) {
861 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
862 goto done;
863 }
864
865 /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
866 ret = krb5_cc_initialize(context, ccache, client);
867 if (ret) {
868 goto done;
869 }
870
871 ret = krb5_cc_store_cred(context, ccache, &creds);
872
873 if (expire_time) {
874 *expire_time = (time_t) creds.times.endtime;
875 }
876
877 done:
878 krb5_free_cred_contents(context, &creds_in);
879
880 if (creds_out) {
881 krb5_free_creds(context, creds_out);
882 } else {
883 krb5_free_cred_contents(context, &creds);
884 }
885
886 if (client) {
887 krb5_free_principal(context, client);
888 }
889 if (ccache) {
890 krb5_cc_close(context, ccache);
891 }
892 if (context) {
893 krb5_free_context(context);
894 }
895
896 return ret;
897 }
898
899 krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
900 {
901 krb5_error_code ret = 0;
902 if (addr == NULL) {
903 return ret;
904 }
905 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
906 krb5_free_addresses(context, addr->addrs);
907 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
908 ret = krb5_free_addresses(context, addr->addrs);
909 SAFE_FREE(addr->addrs);
910 #endif
911 SAFE_FREE(addr);
912 addr = NULL;
913 return ret;
914 }
915
916 #define MAX_NETBIOSNAME_LEN 16
917 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr,
918 const char *netbios_name)
919 {
920 krb5_error_code ret = 0;
921 char buf[MAX_NETBIOSNAME_LEN];
922 int len;
923 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
924 krb5_address **addrs = NULL;
925 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
926 krb5_addresses *addrs = NULL;
927 #endif
928
929 *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
930 if (*kerb_addr == NULL) {
931 return ENOMEM;
932 }
933
934 /* temporarily duplicate put_name() code here to avoid dependency
935 * issues for a 5 lines function */
936 len = strlen(netbios_name);
937 memcpy(buf, netbios_name,
938 (len < MAX_NETBIOSNAME_LEN) ? len : MAX_NETBIOSNAME_LEN - 1);
939 if (len < MAX_NETBIOSNAME_LEN - 1) {
940 memset(buf + len, ' ', MAX_NETBIOSNAME_LEN - 1 - len);
941 }
942 buf[MAX_NETBIOSNAME_LEN - 1] = 0x20;
943
944 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
945 {
946 int num_addr = 2;
947
948 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
949 if (addrs == NULL) {
950 SAFE_FREE(*kerb_addr);
951 return ENOMEM;
952 }
953
954 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
955
956 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
957 if (addrs[0] == NULL) {
958 SAFE_FREE(addrs);
959 SAFE_FREE(*kerb_addr);
960 return ENOMEM;
961 }
962
963 addrs[0]->magic = KV5M_ADDRESS;
964 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
965 addrs[0]->length = MAX_NETBIOSNAME_LEN;
966 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
967 if (addrs[0]->contents == NULL) {
968 SAFE_FREE(addrs[0]);
969 SAFE_FREE(addrs);
970 SAFE_FREE(*kerb_addr);
971 return ENOMEM;
972 }
973
974 memcpy(addrs[0]->contents, buf, addrs[0]->length);
975
976 addrs[1] = NULL;
977 }
978 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
979 {
980 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
981 if (addrs == NULL) {
982 SAFE_FREE(*kerb_addr);
983 return ENOMEM;
984 }
985
986 memset(addrs, 0, sizeof(krb5_addresses));
987
988 addrs->len = 1;
989 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
990 if (addrs->val == NULL) {
991 SAFE_FREE(addrs);
992 SAFE_FREE(kerb_addr);
993 return ENOMEM;
994 }
995
996 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
997 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
998 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
999 if (addrs->val[0].address.data == NULL) {
1000 SAFE_FREE(addrs->val);
1001 SAFE_FREE(addrs);
1002 SAFE_FREE(*kerb_addr);
1003 return ENOMEM;
1004 }
1005
1006 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1007 }
1008 #else
1009 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1010 #endif
1011 (*kerb_addr)->addrs = addrs;
1012
1013 return ret;
1014 }
1015
1016 void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1017 {
1018 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1019 krb5_free_error_contents(context, krberror);
1020 #else /* MIT */
1021 krb5_free_error(context, krberror);
1022 #endif
1023 }
1024
1025 krb5_error_code handle_krberror_packet(krb5_context context,
1026 krb5_data *packet)
1027 {
1028 krb5_error_code ret;
1029 bool got_error_code = false;
1030
1031 DEBUG(10,("handle_krberror_packet: got error packet\n"));
1032
1033 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1034 {
1035 krb5_error krberror;
1036
1037 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1038 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1039 error_message(ret)));
1040 return ret;
1041 }
1042
1043 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1044 ret = (krb5_error_code) krberror.error_code;
1045 got_error_code = true;
1046 }
1047
1048 smb_krb5_free_error(context, &krberror);
1049 }
1050 #else /* MIT */
1051 {
1052 krb5_error *krberror;
1053
1054 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1055 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1056 error_message(ret)));
1057 return ret;
1058 }
1059
1060 if (krberror->e_data.data == NULL) {
1061 #if defined(ERROR_TABLE_BASE_krb5)
1062 ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1063 #else
1064 ret = (krb5_error_code)krberror->error;
1065 #endif
1066 got_error_code = true;
1067 }
1068 smb_krb5_free_error(context, krberror);
1069 }
1070 #endif
1071 if (got_error_code) {
1072 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1073 error_message(ret), ret));
1074 }
1075 return ret;
1076 }
1077
1078 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1079 krb5_get_init_creds_opt **opt)
1080 {
1081 /* Heimdal or modern MIT version */
1082 return krb5_get_init_creds_opt_alloc(context, opt);
1083 }
1084
1085 void smb_krb5_get_init_creds_opt_free(krb5_context context,
1086 krb5_get_init_creds_opt *opt)
1087 {
1088 /* Modern MIT or Heimdal version */
1089 krb5_get_init_creds_opt_free(context, opt);
1090 }
1091
1092 krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1093 {
1094 return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1095 }
1096
1097 krb5_error_code smb_krb5_kt_free_entry(krb5_context context,
1098 krb5_keytab_entry *kt_entry)
1099 {
1100 /* Try krb5_free_keytab_entry_contents first, since
1101 * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
1102 * krb5_kt_free_entry but only has a prototype for the first, while the
1103 * second is considered private.
1104 */
1105 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
1106 return krb5_free_keytab_entry_contents(context, kt_entry);
1107 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
1108 return krb5_kt_free_entry(context, kt_entry);
1109 #else
1110 #error UNKNOWN_KT_FREE_FUNCTION
1111 #endif
1112 }
1113
1114
1115 /* caller needs to free etype_s */
1116 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1117 krb5_enctype enctype,
1118 char **etype_s)
1119 {
1120 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1121 return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1122 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1123 char buf[256];
1124 krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1125 if (ret) {
1126 return ret;
1127 }
1128 *etype_s = SMB_STRDUP(buf);
1129 if (!*etype_s) {
1130 return ENOMEM;
1131 }
1132 return ret;
1133 #else
1134 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1135 #endif
1136 }
1137
1138 /**********************************************************************
1139 * Open a krb5 keytab with flags, handles readonly or readwrite access and
1140 * allows to process non-default keytab names.
1141 * @param context krb5_context
1142 * @param keytab_name_req string
1143 * @param write_access bool if writable keytab is required
1144 * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1145 * @return krb5_error_code
1146 **********************************************************************/
1147
1148 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1149 #ifndef MAX_KEYTAB_NAME_LEN
1150 #define MAX_KEYTAB_NAME_LEN 1100
1151 #endif
1152
1153 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1154 const char *keytab_name_req,
1155 bool write_access,
1156 krb5_keytab *keytab)
1157 {
1158 krb5_error_code ret = 0;
1159 TALLOC_CTX *mem_ctx;
1160 char keytab_string[MAX_KEYTAB_NAME_LEN];
1161 char *kt_str = NULL;
1162 bool found_valid_name = false;
1163 const char *pragma = "FILE";
1164 const char *tmp = NULL;
1165
1166 if (!write_access && !keytab_name_req) {
1167 /* caller just wants to read the default keytab readonly, so be it */
1168 return krb5_kt_default(context, keytab);
1169 }
1170
1171 mem_ctx = talloc_init("smb_krb5_open_keytab");
1172 if (!mem_ctx) {
1173 return ENOMEM;
1174 }
1175
1176 #ifdef HAVE_WRFILE_KEYTAB
1177 if (write_access) {
1178 pragma = "WRFILE";
1179 }
1180 #endif
1181
1182 if (keytab_name_req) {
1183
1184 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1185 ret = KRB5_CONFIG_NOTENUFSPACE;
1186 goto out;
1187 }
1188
1189 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1190 (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1191 tmp = keytab_name_req;
1192 goto resolve;
1193 }
1194
1195 if (keytab_name_req[0] != '/') {
1196 ret = KRB5_KT_BADNAME;
1197 goto out;
1198 }
1199
1200 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1201 if (!tmp) {
1202 ret = ENOMEM;
1203 goto out;
1204 }
1205
1206 goto resolve;
1207 }
1208
1209 /* we need to handle more complex keytab_strings, like:
1210 * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1211
1212 ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1213 if (ret) {
1214 goto out;
1215 }
1216
1217 DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1218
1219 tmp = talloc_strdup(mem_ctx, keytab_string);
1220 if (!tmp) {
1221 ret = ENOMEM;
1222 goto out;
1223 }
1224
1225 if (strncmp(tmp, "ANY:", 4) == 0) {
1226 tmp += 4;
1227 }
1228
1229 memset(&keytab_string, '\0', sizeof(keytab_string));
1230
1231 while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1232 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1233 found_valid_name = true;
1234 tmp = kt_str;
1235 tmp += 7;
1236 }
1237
1238 if (strncmp(kt_str, "FILE:", 5) == 0) {
1239 found_valid_name = true;
1240 tmp = kt_str;
1241 tmp += 5;
1242 }
1243
1244 if (tmp[0] == '/') {
1245 /* Treat as a FILE: keytab definition. */
1246 found_valid_name = true;
1247 }
1248
1249 if (found_valid_name) {
1250 if (tmp[0] != '/') {
1251 ret = KRB5_KT_BADNAME;
1252 goto out;
1253 }
1254
1255 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1256 if (!tmp) {
1257 ret = ENOMEM;
1258 goto out;
1259 }
1260 break;
1261 }
1262 }
1263
1264 if (!found_valid_name) {
1265 ret = KRB5_KT_UNKNOWN_TYPE;
1266 goto out;
1267 }
1268
1269 resolve:
1270 DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1271 ret = krb5_kt_resolve(context, tmp, keytab);
1272
1273 out:
1274 TALLOC_FREE(mem_ctx);
1275 return ret;
1276 }
1277
1278 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1279 krb5_context context,
1280 krb5_keytab keytab,
1281 const char **keytab_name)
1282 {
1283 char keytab_string[MAX_KEYTAB_NAME_LEN];
1284 krb5_error_code ret = 0;
1285
1286 ret = krb5_kt_get_name(context, keytab,
1287 keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1288 if (ret) {
1289 return ret;
1290 }
1291
1292 *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1293 if (!*keytab_name) {
1294 return ENOMEM;
1295 }
1296
1297 return ret;
1298 }
1299
1300 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1301 defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1302 defined(HAVE_KRB5_GET_CREDS)
1303 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1304 krb5_ccache ccache,
1305 krb5_principal me,
1306 krb5_principal server,
1307 krb5_principal impersonate_princ,
1308 krb5_creds **out_creds)
1309 {
1310 krb5_error_code ret;
1311 krb5_get_creds_opt opt;
1312
1313 ret = krb5_get_creds_opt_alloc(context, &opt);
1314 if (ret) {
1315 goto done;
1316 }
1317 krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1318
1319 if (impersonate_princ) {
1320 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1321 impersonate_princ);
1322 if (ret) {
1323 goto done;
1324 }
1325 }
1326
1327 ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1328 if (ret) {
1329 goto done;
1330 }
1331
1332 done:
1333 if (opt) {
1334 krb5_get_creds_opt_free(context, opt);
1335 }
1336 return ret;
1337 }
1338 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1339
1340 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1341 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1342 krb5_ccache ccache,
1343 krb5_principal me,
1344 krb5_principal server,
1345 krb5_principal impersonate_princ,
1346 krb5_creds **out_creds)
1347 {
1348 krb5_error_code ret;
1349 krb5_creds in_creds;
1350
1351 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1352 krb5_error_code KRB5_CALLCONV
1353 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1354 krb5_ccache ccache, krb5_creds *in_creds,
1355 krb5_data *subject_cert,
1356 krb5_creds **out_creds);
1357 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1358
1359 ZERO_STRUCT(in_creds);
1360
1361 if (impersonate_princ) {
1362
1363 in_creds.server = me;
1364 in_creds.client = impersonate_princ;
1365
1366 ret = krb5_get_credentials_for_user(context,
1367 0, /* krb5_flags options */
1368 ccache,
1369 &in_creds,
1370 NULL, /* krb5_data *subject_cert */
1371 out_creds);
1372 } else {
1373 in_creds.client = me;
1374 in_creds.server = server;
1375
1376 ret = krb5_get_credentials(context, 0, ccache,
1377 &in_creds, out_creds);
1378 }
1379
1380 return ret;
1381 }
1382 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1383
1384 /*
1385 * smb_krb5_get_credentials
1386 *
1387 * @brief Get krb5 credentials for a server
1388 *
1389 * @param[in] context An initialized krb5_context
1390 * @param[in] ccache An initialized krb5_ccache
1391 * @param[in] me The krb5_principal of the caller
1392 * @param[in] server The krb5_principal of the requested service
1393 * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1394 * @param[out] out_creds The returned krb5_creds structure
1395 * @return krb5_error_code
1396 *
1397 */
1398 krb5_error_code smb_krb5_get_credentials(krb5_context context,
1399 krb5_ccache ccache,
1400 krb5_principal me,
1401 krb5_principal server,
1402 krb5_principal impersonate_princ,
1403 krb5_creds **out_creds)
1404 {
1405 krb5_error_code ret;
1406 krb5_creds *creds = NULL;
1407
1408 *out_creds = NULL;
1409
1410 if (impersonate_princ) {
1411 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
1412 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
1413 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
1414 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
1415 #else
1416 ret = ENOTSUP;
1417 #endif
1418 } else {
1419 krb5_creds in_creds;
1420
1421 ZERO_STRUCT(in_creds);
1422
1423 in_creds.client = me;
1424 in_creds.server = server;
1425
1426 ret = krb5_get_credentials(context, 0, ccache,
1427 &in_creds, &creds);
1428 }
1429 if (ret) {
1430 goto done;
1431 }
1432
1433 if (out_creds) {
1434 *out_creds = creds;
1435 }
1436
1437 done:
1438 if (creds && ret) {
1439 krb5_free_creds(context, creds);
1440 }
1441
1442 return ret;
1443 }
1444
1445 krb5_error_code smb_krb5_keyblock_init_contents(krb5_context context,
1446 krb5_enctype enctype,
1447 const void *data,
1448 size_t length,
1449 krb5_keyblock *key)
1450 {
1451 #if defined(HAVE_KRB5_KEYBLOCK_INIT)
1452 return krb5_keyblock_init(context, enctype, data, length, key);
1453 #else
1454 memset(key, 0, sizeof(krb5_keyblock));
1455 KRB5_KEY_DATA(key) = SMB_MALLOC(length);
1456 if (NULL == KRB5_KEY_DATA(key)) {
1457 return ENOMEM;
1458 }
1459 memcpy(KRB5_KEY_DATA(key), data, length);
1460 KRB5_KEY_LENGTH(key) = length;
1461 KRB5_KEY_TYPE(key) = enctype;
1462 return 0;
1463 #endif
1464 }
1465
1466 /*
1467 simulate a kinit, putting the tgt in the given credentials cache.
1468 Orignally by remus@snapserver.com
1469
1470 This version is built to use a keyblock, rather than needing the
1471 original password.
1472
1473 The impersonate_principal is the principal if NULL, or the principal
1474 to impersonate
1475
1476 The target_service defaults to the krbtgt if NULL, but could be
1477 kpasswd/realm or the local service (if we are doing s4u2self)
1478 */
1479 krb5_error_code kerberos_kinit_keyblock_cc(krb5_context ctx, krb5_ccache cc,
1480 krb5_principal principal,
1481 krb5_keyblock *keyblock,
1482 const char *target_service,
1483 krb5_get_init_creds_opt *krb_options,
1484 time_t *expire_time,
1485 time_t *kdc_time)
1486 {
1487 krb5_error_code code = 0;
1488 krb5_creds my_creds;
1489
1490 #if defined(HAVE_KRB5_GET_INIT_CREDS_KEYBLOCK)
1491 code = krb5_get_init_creds_keyblock(ctx, &my_creds, principal,
1492 keyblock, 0, target_service,
1493 krb_options);
1494 #elif defined(HAVE_KRB5_GET_INIT_CREDS_KEYTAB)
1495 {
1496 #define SMB_CREDS_KEYTAB "MEMORY:tmp_smb_creds_XXXXXX"
1497 char tmp_name[sizeof(SMB_CREDS_KEYTAB)];
1498 krb5_keytab_entry entry;
1499 krb5_keytab keytab;
1500
1501 memset(&entry, 0, sizeof(entry));
1502 entry.principal = principal;
1503 *(KRB5_KT_KEY(&entry)) = *keyblock;
1504
1505 memcpy(tmp_name, SMB_CREDS_KEYTAB, sizeof(SMB_CREDS_KEYTAB));
1506 mktemp(tmp_name);
1507 if (tmp_name[0] == 0) {
1508 return KRB5_KT_BADNAME;
1509 }
1510 code = krb5_kt_resolve(ctx, tmp_name, &keytab);
1511 if (code) {
1512 return code;
1513 }
1514
1515 code = krb5_kt_add_entry(ctx, keytab, &entry);
1516 if (code) {
1517 (void)krb5_kt_close(ctx, keytab);
1518 goto done;
1519 }
1520
1521 code = krb5_get_init_creds_keytab(ctx, &my_creds, principal,
1522 keytab, 0, target_service,
1523 krb_options);
1524 (void)krb5_kt_close(ctx, keytab);
1525 }
1526 #else
1527 #error krb5_get_init_creds_keyblock not available!
1528 #endif
1529 if (code) {
1530 return code;
1531 }
1532
1533 code = krb5_cc_initialize(ctx, cc, principal);
1534 if (code) {
1535 goto done;
1536 }
1537
1538 code = krb5_cc_store_cred(ctx, cc, &my_creds);
1539 if (code) {
1540 goto done;
1541 }
1542
1543 if (expire_time) {
1544 *expire_time = (time_t) my_creds.times.endtime;
1545 }
1546
1547 if (kdc_time) {
1548 *kdc_time = (time_t) my_creds.times.starttime;
1549 }
1550
1551 code = 0;
1552 done:
1553 krb5_free_cred_contents(ctx, &my_creds);
1554 return code;
1555 }
1556
1557 krb5_error_code kerberos_kinit_password_cc(krb5_context ctx, krb5_ccache cc,
1558 krb5_principal principal,
1559 const char *password,
1560 const char *target_service,
1561 krb5_get_init_creds_opt *krb_options,
1562 time_t *expire_time,
1563 time_t *kdc_time)
1564 {
1565 krb5_error_code code = 0;
1566 krb5_creds my_creds;
1567
1568 code = krb5_get_init_creds_password(ctx, &my_creds, principal,
1569 password, NULL, NULL, 0,
1570 target_service, krb_options);
1571 if (code) {
1572 return code;
1573 }
1574
1575 code = krb5_cc_initialize(ctx, cc, principal);
1576 if (code) {
1577 goto done;
1578 }
1579
1580 code = krb5_cc_store_cred(ctx, cc, &my_creds);
1581 if (code) {
1582 goto done;
1583 }
1584
1585 if (expire_time) {
1586 *expire_time = (time_t) my_creds.times.endtime;
1587 }
1588
1589 if (kdc_time) {
1590 *kdc_time = (time_t) my_creds.times.starttime;
1591 }
1592
1593 code = 0;
1594 done:
1595 krb5_free_cred_contents(ctx, &my_creds);
1596 return code;
1597 }
1598
1599 #ifdef SAMBA4_USES_HEIMDAL
1600 /*
1601 simulate a kinit, putting the tgt in the given credentials cache.
1602 Orignally by remus@snapserver.com
1603
1604 The impersonate_principal is the principal
1605
1606 The self_service, should be the local service (for S4U2Self if
1607 impersonate_principal is given).
1608
1609 The target_service defaults to the krbtgt if NULL, but could be
1610 kpasswd/realm or a remote service (for S4U2Proxy)
1611
1612 */
1613 krb5_error_code kerberos_kinit_s4u2_cc(krb5_context ctx,
1614 krb5_ccache store_cc,
1615 krb5_principal init_principal,
1616 const char *init_password,
1617 krb5_principal impersonate_principal,
1618 const char *self_service,
1619 const char *target_service,
1620 krb5_get_init_creds_opt *krb_options,
1621 time_t *expire_time,
1622 time_t *kdc_time)
1623 {
1624 krb5_error_code code = 0;
1625 krb5_get_creds_opt options;
1626 krb5_principal store_principal;
1627 krb5_creds store_creds;
1628 krb5_creds *s4u2self_creds;
1629 Ticket s4u2self_ticket;
1630 size_t s4u2self_ticketlen;
1631 krb5_creds *s4u2proxy_creds;
1632 krb5_principal self_princ;
1633 bool s4u2proxy;
1634 krb5_principal target_princ;
1635 krb5_ccache tmp_cc;
1636 const char *self_realm;
1637 krb5_principal blacklist_principal = NULL;
1638 krb5_principal whitelist_principal = NULL;
1639
1640 code = krb5_get_init_creds_password(ctx, &store_creds,
1641 init_principal,
1642 init_password,
1643 NULL, NULL,
1644 0,
1645 NULL,
1646 krb_options);
1647 if (code != 0) {
1648 return code;
1649 }
1650
1651 store_principal = init_principal;
1652
1653 /*
1654 * We are trying S4U2Self now:
1655 *
1656 * As we do not want to expose our TGT in the
1657 * krb5_ccache, which is also holds the impersonated creds.
1658 *
1659 * Some low level krb5/gssapi function might use the TGT
1660 * identity and let the client act as our machine account.
1661 *
1662 * We need to avoid that and use a temporary krb5_ccache
1663 * in order to pass our TGT to the krb5_get_creds() function.
1664 */
1665 code = krb5_cc_new_unique(ctx, NULL, NULL, &tmp_cc);
1666 if (code != 0) {
1667 krb5_free_cred_contents(ctx, &store_creds);
1668 return code;
1669 }
1670
1671 code = krb5_cc_initialize(ctx, tmp_cc, store_creds.client);
1672 if (code != 0) {
1673 krb5_cc_destroy(ctx, tmp_cc);
1674 krb5_free_cred_contents(ctx, &store_creds);
1675 return code;
1676 }
1677
1678 code = krb5_cc_store_cred(ctx, tmp_cc, &store_creds);
1679 if (code != 0) {
1680 krb5_free_cred_contents(ctx, &store_creds);
1681 krb5_cc_destroy(ctx, tmp_cc);
1682 return code;
1683 }
1684
1685 /*
1686 * we need to remember the client principal of our
1687 * TGT and make sure the KDC does not return this
1688 * in the impersonated tickets. This can happen
1689 * if the KDC does not support S4U2Self and S4U2Proxy.
1690 */
1691 blacklist_principal = store_creds.client;
1692 store_creds.client = NULL;
1693 krb5_free_cred_contents(ctx, &store_creds);
1694
1695 /*
1696 * Check if we also need S4U2Proxy or if S4U2Self is
1697 * enough in order to get a ticket for the target.
1698 */
1699 if (target_service == NULL) {
1700 s4u2proxy = false;
1701 } else if (strcmp(target_service, self_service) == 0) {
1702 s4u2proxy = false;
1703 } else {
1704 s4u2proxy = true;
1705 }
1706
1707 /*
1708 * For S4U2Self we need our own service principal,
1709 * which belongs to our own realm (available on
1710 * our client principal).
1711 */
1712 self_realm = krb5_principal_get_realm(ctx, init_principal);
1713
1714 code = krb5_parse_name(ctx, self_service, &self_princ);
1715 if (code != 0) {
1716 krb5_free_principal(ctx, blacklist_principal);
1717 krb5_cc_destroy(ctx, tmp_cc);
1718 return code;
1719 }
1720
1721 code = krb5_principal_set_realm(ctx, self_princ, self_realm);
1722 if (code != 0) {
1723 krb5_free_principal(ctx, blacklist_principal);
1724 krb5_free_principal(ctx, self_princ);
1725 krb5_cc_destroy(ctx, tmp_cc);
1726 return code;
1727 }
1728
1729 code = krb5_get_creds_opt_alloc(ctx, &options);
1730 if (code != 0) {
1731 krb5_free_principal(ctx, blacklist_principal);
1732 krb5_free_principal(ctx, self_princ);
1733 krb5_cc_destroy(ctx, tmp_cc);
1734 return code;
1735 }
1736
1737 if (s4u2proxy) {
1738 /*
1739 * If we want S4U2Proxy, we need the forwardable flag
1740 * on the S4U2Self ticket.
1741 */
1742 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
1743 }
1744
1745 code = krb5_get_creds_opt_set_impersonate(ctx, options,
1746 impersonate_principal);
1747 if (code != 0) {
1748 krb5_get_creds_opt_free(ctx, options);
1749 krb5_free_principal(ctx, blacklist_principal);
1750 krb5_free_principal(ctx, self_princ);
1751 krb5_cc_destroy(ctx, tmp_cc);
1752 return code;
1753 }
1754
1755 code = krb5_get_creds(ctx, options, tmp_cc,
1756 self_princ, &s4u2self_creds);
1757 krb5_get_creds_opt_free(ctx, options);
1758 krb5_free_principal(ctx, self_princ);
1759 if (code != 0) {
1760 krb5_free_principal(ctx, blacklist_principal);
1761 krb5_cc_destroy(ctx, tmp_cc);
1762 return code;
1763 }
1764
1765 if (!s4u2proxy) {
1766 krb5_cc_destroy(ctx, tmp_cc);
1767
1768 /*
1769 * Now make sure we store the impersonated principal
1770 * and creds instead of the TGT related stuff
1771 * in the krb5_ccache of the caller.
1772 */
1773 code = krb5_copy_creds_contents(ctx, s4u2self_creds,
1774 &store_creds);
1775 krb5_free_creds(ctx, s4u2self_creds);
1776 if (code != 0) {
1777 return code;
1778 }
1779
1780 /*
1781 * It's important to store the principal the KDC
1782 * returned, as otherwise the caller would not find
1783 * the S4U2Self ticket in the krb5_ccache lookup.
1784 */
1785 store_principal = store_creds.client;
1786 goto store;
1787 }
1788
1789 /*
1790 * We are trying S4U2Proxy:
1791 *
1792 * We need the ticket from the S4U2Self step
1793 * and our TGT in order to get the delegated ticket.
1794 */
1795 code = decode_Ticket((const uint8_t *)s4u2self_creds->ticket.data,
1796 s4u2self_creds->ticket.length,
1797 &s4u2self_ticket,
1798 &s4u2self_ticketlen);
1799 if (code != 0) {
1800 krb5_free_creds(ctx, s4u2self_creds);
1801 krb5_free_principal(ctx, blacklist_principal);
1802 krb5_cc_destroy(ctx, tmp_cc);
1803 return code;
1804 }
1805
1806 /*
1807 * we need to remember the client principal of the
1808 * S4U2Self stage and as it needs to match the one we
1809 * will get for the S4U2Proxy stage. We need this
1810 * in order to detect KDCs which does not support S4U2Proxy.
1811 */
1812 whitelist_principal = s4u2self_creds->client;
1813 s4u2self_creds->client = NULL;
1814 krb5_free_creds(ctx, s4u2self_creds);
1815
1816 /*
1817 * For S4U2Proxy we also got a target service principal,
1818 * which also belongs to our own realm (available on
1819 * our client principal).
1820 */
1821 code = krb5_parse_name(ctx, target_service, &target_princ);
1822 if (code != 0) {
1823 free_Ticket(&s4u2self_ticket);
1824 krb5_free_principal(ctx, whitelist_principal);
1825 krb5_free_principal(ctx, blacklist_principal);
1826 krb5_cc_destroy(ctx, tmp_cc);
1827 return code;
1828 }
1829
1830 code = krb5_principal_set_realm(ctx, target_princ, self_realm);
1831 if (code != 0) {
1832 free_Ticket(&s4u2self_ticket);
1833 krb5_free_principal(ctx, target_princ);
1834 krb5_free_principal(ctx, whitelist_principal);
1835 krb5_free_principal(ctx, blacklist_principal);
1836 krb5_cc_destroy(ctx, tmp_cc);
1837 return code;
1838 }
1839
1840 code = krb5_get_creds_opt_alloc(ctx, &options);
1841 if (code != 0) {
1842 free_Ticket(&s4u2self_ticket);
1843 krb5_free_principal(ctx, target_princ);
1844 krb5_free_principal(ctx, whitelist_principal);
1845 krb5_free_principal(ctx, blacklist_principal);
1846 krb5_cc_destroy(ctx, tmp_cc);
1847 return code;
1848 }
1849
1850 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
1851 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_CONSTRAINED_DELEGATION);
1852
1853 code = krb5_get_creds_opt_set_ticket(ctx, options, &s4u2self_ticket);
1854 free_Ticket(&s4u2self_ticket);
1855 if (code != 0) {
1856 krb5_get_creds_opt_free(ctx, options);
1857 krb5_free_principal(ctx, target_princ);
1858 krb5_free_principal(ctx, whitelist_principal);
1859 krb5_free_principal(ctx, blacklist_principal);
1860 krb5_cc_destroy(ctx, tmp_cc);
1861 return code;
1862 }
1863
1864 code = krb5_get_creds(ctx, options, tmp_cc,
1865 target_princ, &s4u2proxy_creds);
1866 krb5_get_creds_opt_free(ctx, options);
1867 krb5_free_principal(ctx, target_princ);
1868 krb5_cc_destroy(ctx, tmp_cc);
1869 if (code != 0) {
1870 krb5_free_principal(ctx, whitelist_principal);
1871 krb5_free_principal(ctx, blacklist_principal);
1872 return code;
1873 }
1874
1875 /*
1876 * Now make sure we store the impersonated principal
1877 * and creds instead of the TGT related stuff
1878 * in the krb5_ccache of the caller.
1879 */
1880 code = krb5_copy_creds_contents(ctx, s4u2proxy_creds,
1881 &store_creds);
1882 krb5_free_creds(ctx, s4u2proxy_creds);
1883 if (code != 0) {
1884 krb5_free_principal(ctx, whitelist_principal);
1885 krb5_free_principal(ctx, blacklist_principal);
1886 return code;
1887 }
1888
1889 /*
1890 * It's important to store the principal the KDC
1891 * returned, as otherwise the caller would not find
1892 * the S4U2Self ticket in the krb5_ccache lookup.
1893 */
1894 store_principal = store_creds.client;
1895
1896 store:
1897 if (blacklist_principal &&
1898 krb5_principal_compare(ctx, store_creds.client, blacklist_principal)) {
1899 char *sp = NULL;
1900 char *ip = NULL;
1901
1902 code = krb5_unparse_name(ctx, blacklist_principal, &sp);
1903 if (code != 0) {
1904 sp = NULL;
1905 }
1906 code = krb5_unparse_name(ctx, impersonate_principal, &ip);
1907 if (code != 0) {
1908 ip = NULL;
1909 }
1910 DEBUG(1, ("kerberos_kinit_password_cc: "
1911 "KDC returned self principal[%s] while impersonating [%s]\n",
1912 sp?sp:"<no memory>",
1913 ip?ip:"<no memory>"));
1914
1915 SAFE_FREE(sp);
1916 SAFE_FREE(ip);
1917
1918 krb5_free_principal(ctx, whitelist_principal);
1919 krb5_free_principal(ctx, blacklist_principal);
1920 krb5_free_cred_contents(ctx, &store_creds);
1921 return KRB5_FWD_BAD_PRINCIPAL;
1922 }
1923 if (blacklist_principal) {
1924 krb5_free_principal(ctx, blacklist_principal);
1925 }
1926
1927 if (whitelist_principal &&
1928 !krb5_principal_compare(ctx, store_creds.client, whitelist_principal)) {
1929 char *sp = NULL;
1930 char *ep = NULL;
1931
1932 code = krb5_unparse_name(ctx, store_creds.client, &sp);
1933 if (code != 0) {
1934 sp = NULL;
1935 }
1936 code = krb5_unparse_name(ctx, whitelist_principal, &ep);
1937 if (code != 0) {
1938 ep = NULL;
1939 }
1940 DEBUG(1, ("kerberos_kinit_password_cc: "
1941 "KDC returned wrong principal[%s] we expected [%s]\n",
1942 sp?sp:"<no memory>",
1943 ep?ep:"<no memory>"));
1944
1945 SAFE_FREE(sp);
1946 SAFE_FREE(ep);
1947
1948 krb5_free_principal(ctx, whitelist_principal);
1949 krb5_free_cred_contents(ctx, &store_creds);
1950 return KRB5_FWD_BAD_PRINCIPAL;
1951 }
1952 if (whitelist_principal) {
1953 krb5_free_principal(ctx, whitelist_principal);
1954 }
1955
1956 code = krb5_cc_initialize(ctx, store_cc, store_principal);
1957 if (code != 0) {
1958 krb5_free_cred_contents(ctx, &store_creds);
1959 return code;
1960 }
1961
1962 code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
1963 if (code != 0) {
1964 krb5_free_cred_contents(ctx, &store_creds);
1965 return code;
1966 }
1967
1968 if (expire_time) {
1969 *expire_time = (time_t) store_creds.times.endtime;
1970 }
1971
1972 if (kdc_time) {
1973 *kdc_time = (time_t) store_creds.times.starttime;
1974 }
1975
1976 krb5_free_cred_contents(ctx, &store_creds);
1977
1978 return 0;
1979 }
1980 #endif
1981
1982 #if !defined(HAVE_KRB5_MAKE_PRINCIPAL) && defined(HAVE_KRB5_BUILD_PRINCIPAL_ALLOC_VA)
1983 krb5_error_code smb_krb5_make_principal(krb5_context context,
1984 krb5_principal *principal,
1985 const char *_realm, ...)
1986 {
1987 krb5_error_code code;
1988 bool free_realm;
1989 char *realm;
1990 va_list ap;
1991
1992 if (_realm) {
1993 realm = _realm;
1994 free_realm = false;
1995 } else {
1996 code = krb5_get_default_realm(context, &realm);
1997 if (code) {
1998 return code;
1999 }
2000 free_realm = true;
2001 }
2002
2003 va_start(ap, _realm);
2004 code = krb5_build_principal_alloc_va(context, principal,
2005 strlen(realm), realm,
2006 ap);
2007 va_end(ap);
2008
2009 if (free_realm) {
2010 krb5_free_default_realm(context, realm);
2011 }
2012
2013 return code;
2014 }
2015 #endif
2016
2017 #if !defined(HAVE_KRB5_CC_GET_LIFETIME) && defined(HAVE_KRB5_CC_RETRIEVE_CRED)
2018 /**
2019 * @brief Get the lifetime of the initial ticket in the cache.
2020 *
2021 * @param[in] context The kerberos context.
2022 *
2023 * @param[in] id The credential cache to get the ticket lifetime.
2024 *
2025 * @param[out] t A pointer to a time value to store the lifetime.
2026 *
2027 * @return 0 on success, a krb5_error_code on error.
2028 */
2029 krb5_error_code smb_krb5_cc_get_lifetime(krb5_context context,
2030 krb5_ccache id,
2031 time_t *t)
2032 {
2033 krb5_cc_cursor cursor;
2034 krb5_error_code kerr;
2035 krb5_creds cred;
2036 krb5_timestamp now;
2037
2038 *t = 0;
2039
2040 kerr = krb5_timeofday(context, &now);
2041 if (kerr) {
2042 return kerr;
2043 }
2044
2045 kerr = krb5_cc_start_seq_get(context, id, &cursor);
2046 if (kerr) {
2047 return kerr;
2048 }
2049
2050 while ((kerr = krb5_cc_next_cred(context, id, &cursor, &cred)) == 0) {
2051 #ifndef HAVE_FLAGS_IN_KRB5_CREDS
2052 if (cred.ticket_flags & TKT_FLG_INITIAL) {
2053 #else
2054 if (cred.flags.b.initial) {
2055 #endif
2056 if (now < cred.times.endtime) {
2057 *t = (time_t) (cred.times.endtime - now);
2058 }
2059 krb5_free_cred_contents(context, &cred);
2060 break;
2061 }
2062 krb5_free_cred_contents(context, &cred);
2063 }
2064
2065 krb5_cc_end_seq_get(context, id, &cursor);
2066
2067 return kerr;
2068 }
2069 #endif /* HAVE_KRB5_CC_GET_LIFETIME */
2070
2071 #if !defined(HAVE_KRB5_FREE_CHECKSUM_CONTENTS) && defined(HAVE_FREE_CHECKSUM)
2072 void smb_krb5_free_checksum_contents(krb5_context ctx, krb5_checksum *cksum)
2073 {
2074 free_Checksum(cksum);
2075 }
2076 #endif
2077
2078 krb5_error_code smb_krb5_make_pac_checksum(TALLOC_CTX *mem_ctx,
2079 DATA_BLOB *pac_data,
2080 krb5_context context,
2081 const krb5_keyblock *keyblock,
2082 uint32_t *sig_type,
2083 DATA_BLOB *sig_blob)
2084 {
2085 krb5_error_code ret;
2086 krb5_checksum cksum;
2087 #if defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CREATE_CHECKSUM)
2088 krb5_crypto crypto;
2089
2090
2091 ret = krb5_crypto_init(context,
2092 keyblock,
2093 0,
2094 &crypto);
2095 if (ret) {
2096 DEBUG(0,("krb5_crypto_init() failed: %s\n",
2097 smb_get_krb5_error_message(context, ret, mem_ctx)));
2098 return ret;
2099 }
2100 ret = krb5_create_checksum(context,
2101 crypto,
2102 KRB5_KU_OTHER_CKSUM,
2103 0,
2104 pac_data->data,
2105 pac_data->length,
2106 &cksum);
2107 if (ret) {
2108 DEBUG(2, ("PAC Verification failed: %s\n",
2109 smb_get_krb5_error_message(context, ret, mem_ctx)));
2110 }
2111
2112 krb5_crypto_destroy(context, crypto);
2113
2114 if (ret) {
2115 return ret;
2116 }
2117
2118 *sig_type = cksum.cksumtype;
2119 *sig_blob = data_blob_talloc(mem_ctx,
2120 cksum.checksum.data,
2121 cksum.checksum.length);
2122 #elif defined(HAVE_KRB5_C_MAKE_CHECKSUM)
2123 krb5_data input;
2124
2125 input.data = (char *)pac_data->data;
2126 input.length = pac_data->length;
2127
2128 ret = krb5_c_make_checksum(context,
2129 0,
2130 keyblock,
2131 KRB5_KEYUSAGE_APP_DATA_CKSUM,
2132 &input,
2133 &cksum);
2134 if (ret) {
2135 DEBUG(2, ("PAC Verification failed: %s\n",
2136 smb_get_krb5_error_message(context, ret, mem_ctx)));
2137 return ret;
2138 }
2139
2140 *sig_type = cksum.checksum_type;
2141 *sig_blob = data_blob_talloc(mem_ctx,
2142 cksum.contents,
2143 cksum.length);
2144
2145 #else
2146 #error krb5_create_checksum or krb5_c_make_checksum not available
2147 #endif /* HAVE_KRB5_C_MAKE_CHECKSUM */
2148 smb_krb5_free_checksum_contents(context, &cksum);
2149
2150 return 0;
2151 }
2152
2153
2154 /*
2155 * smb_krb5_principal_get_realm
2156 *
2157 * @brief Get realm of a principal
2158 *
2159 * @param[in] context The krb5_context
2160 * @param[in] principal The principal
2161 * @return pointer to the realm
2162 *
2163 */
2164
2165 char *smb_krb5_principal_get_realm(krb5_context context,
2166 krb5_principal principal)
2167 {
2168 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2169 return discard_const_p(char, krb5_principal_get_realm(context, principal));
2170 #elif defined(krb5_princ_realm) /* MIT */
2171 krb5_data *realm;
2172 realm = krb5_princ_realm(context, principal);
2173 return discard_const_p(char, realm->data);
2174 #else
2175 return NULL;
2176 #endif
2177 }
2178
2179 /************************************************************************
2180 Routine to get the default realm from the kerberos credentials cache.
2181 Caller must free if the return value is not NULL.
2182 ************************************************************************/
2183
2184 static char *smb_krb5_get_default_realm_from_ccache(TALLOC_CTX *mem_ctx)
2185 {
2186 char *realm = NULL;
2187 krb5_context ctx = NULL;
2188 krb5_ccache cc = NULL;
2189 krb5_principal princ = NULL;
2190
2191 initialize_krb5_error_table();
2192 if (krb5_init_context(&ctx)) {
2193 return NULL;
2194 }
2195
2196 DEBUG(5,("kerberos_get_default_realm_from_ccache: "
2197 "Trying to read krb5 cache: %s\n",
2198 krb5_cc_default_name(ctx)));
2199 if (krb5_cc_default(ctx, &cc)) {
2200 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
2201 "failed to read default cache\n"));
2202 goto out;
2203 }
2204 if (krb5_cc_get_principal(ctx, cc, &princ)) {
2205 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
2206 "failed to get default principal\n"));
2207 goto out;
2208 }
2209
2210 #if defined(HAVE_KRB5_PRINCIPAL_GET_REALM)
2211 realm = talloc_strdup(mem_ctx, krb5_principal_get_realm(ctx, princ));
2212 #elif defined(HAVE_KRB5_PRINC_REALM)
2213 {
2214 krb5_data *realm_data = krb5_princ_realm(ctx, princ);
2215 realm = talloc_strndup(mem_ctx, realm_data->data, realm_data->length);
2216 }
2217 #endif
2218
2219 out:
2220
2221 if (ctx) {
2222 if (princ) {
2223 krb5_free_principal(ctx, princ);
2224 }
2225 if (cc) {
2226 krb5_cc_close(ctx, cc);
2227 }
2228 krb5_free_context(ctx);
2229 }
2230
2231 return realm;
2232 }
2233
2234 /************************************************************************
2235 Routine to get the realm from a given DNS name.
2236 ************************************************************************/
2237
2238 static char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
2239 const char *hostname)
2240 {
2241 #if defined(HAVE_KRB5_REALM_TYPE)
2242 /* Heimdal. */
2243 krb5_realm *realm_list = NULL;
2244 #else
2245 /* MIT */
2246 char **realm_list = NULL;
2247 #endif
2248 char *realm = NULL;
2249 krb5_error_code kerr;
2250 krb5_context ctx = NULL;
2251
2252 initialize_krb5_error_table();
2253 if (krb5_init_context(&ctx)) {
2254 return NULL;
2255 }
2256
2257 kerr = krb5_get_host_realm(ctx, hostname, &realm_list);
2258 if (kerr != 0) {
2259 DEBUG(3,("kerberos_get_realm_from_hostname %s: "
2260 "failed %s\n",
2261 hostname ? hostname : "(NULL)",
2262 error_message(kerr) ));
2263 goto out;
2264 }
2265
2266 if (realm_list && realm_list[0]) {
2267 realm = talloc_strdup(mem_ctx, realm_list[0]);
2268 }
2269
2270 out:
2271
2272 if (ctx) {
2273 if (realm_list) {
2274 krb5_free_host_realm(ctx, realm_list);
2275 realm_list = NULL;
2276 }
2277 krb5_free_context(ctx);
2278 ctx = NULL;
2279 }
2280 return realm;
2281 }
2282
2283 char *kerberos_get_principal_from_service_hostname(TALLOC_CTX *mem_ctx,
2284 const char *service,
2285 const char *remote_name,
2286 const char *default_realm)
2287 {
2288 char *realm = NULL;
2289 char *host = NULL;
2290 char *principal;
2291 host = strchr_m(remote_name, '.');
2292 if (host) {
2293 /* DNS name. */
2294 realm = smb_krb5_get_realm_from_hostname(talloc_tos(),
2295 remote_name);
2296 } else {
2297 /* NetBIOS name - use our realm. */
2298 realm = smb_krb5_get_default_realm_from_ccache(talloc_tos());
2299 }
2300
2301 if (realm == NULL || *realm == '\0') {
2302 realm = talloc_strdup(talloc_tos(), default_realm);
2303 if (!realm) {
2304 return NULL;
2305 }
2306 DEBUG(3,("kerberos_get_principal_from_service_hostname: "
2307 "cannot get realm from, "
2308 "desthost %s or default ccache. Using default "
2309 "smb.conf realm %s\n",
2310 remote_name,
2311 realm));
2312 }
2313
2314 principal = talloc_asprintf(mem_ctx,
2315 "%s/%s@%s",
2316 service, remote_name,
2317 realm);
2318 TALLOC_FREE(realm);
2319 return principal;
2320 }
2321
2322 char *smb_get_krb5_error_message(krb5_context context,
2323 krb5_error_code code,
2324 TALLOC_CTX *mem_ctx)
2325 {
2326 char *ret;
2327
2328 #if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
2329 const char *context_error = krb5_get_error_message(context, code);
2330 if (context_error) {
2331 ret = talloc_asprintf(mem_ctx, "%s: %s",
2332 error_message(code), context_error);
2333 krb5_free_error_message(context, context_error);
2334 return ret;
2335 }
2336 #endif
2337 ret = talloc_strdup(mem_ctx, error_message(code));
2338 return ret;
2339 }
2340
2341 #else /* HAVE_KRB5 */
2342 /* this saves a few linking headaches */
2343 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
2344 const char *principal, time_t time_offset,
2345 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
2346 uint32_t extra_ap_opts,
2347 const char *ccname, time_t *tgs_expire,
2348 const char *impersonate_princ_s)
2349 {
2350 DEBUG(0,("NO KERBEROS SUPPORT\n"));
2351 return 1;
2352 }
2353
2354 #endif /* HAVE_KRB5 */
reg import