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dbwrap: add dbwrap_check() function.
[Samba.git] / lib / krb5_wrap / krb5_samba.c
blob2d237ffa1242094b657f227ddaae798a24389032
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 ENCTYPE_NULL};
692
693 initialize_krb5_error_table();
694 retval = krb5_init_context(&context);
695 if (retval) {
696 DEBUG(1, ("krb5_init_context failed (%s)\n",
697 error_message(retval)));
698 goto failed;
699 }
700
701 if (time_offset != 0) {
702 krb5_set_real_time(context, time(NULL) + time_offset, 0);
703 }
704
705 if ((retval = krb5_cc_resolve(context, ccname ?
706 ccname : krb5_cc_default_name(context), &ccdef))) {
707 DEBUG(1, ("krb5_cc_default failed (%s)\n",
708 error_message(retval)));
709 goto failed;
710 }
711
712 if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
713 DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
714 error_message(retval)));
715 goto failed;
716 }
717
718 retval = ads_krb5_mk_req(context, &auth_context,
719 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
720 principal, ccdef, &packet,
721 tgs_expire, impersonate_princ_s);
722 if (retval) {
723 goto failed;
724 }
725
726 get_krb5_smb_session_key(mem_ctx, context, auth_context,
727 session_key_krb5, false);
728
729 *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
730
731 kerberos_free_data_contents(context, &packet);
732
733 failed:
734
735 if (context) {
736 if (ccdef)
737 krb5_cc_close(context, ccdef);
738 if (auth_context)
739 krb5_auth_con_free(context, auth_context);
740 krb5_free_context(context);
741 }
742
743 return retval;
744 }
745
746 bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
747 krb5_context context,
748 krb5_auth_context auth_context,
749 DATA_BLOB *session_key, bool remote)
750 {
751 krb5_keyblock *skey = NULL;
752 krb5_error_code err = 0;
753 bool ret = false;
754
755 if (remote) {
756 err = krb5_auth_con_getremotesubkey(context,
757 auth_context, &skey);
758 } else {
759 err = krb5_auth_con_getlocalsubkey(context,
760 auth_context, &skey);
761 }
762
763 if (err || skey == NULL) {
764 DEBUG(10, ("KRB5 error getting session key %d\n", err));
765 goto done;
766 }
767
768 DEBUG(10, ("Got KRB5 session key of length %d\n",
769 (int)KRB5_KEY_LENGTH(skey)));
770
771 *session_key = data_blob_talloc(mem_ctx,
772 KRB5_KEY_DATA(skey),
773 KRB5_KEY_LENGTH(skey));
774 dump_data_pw("KRB5 Session Key:\n",
775 session_key->data,
776 session_key->length);
777
778 ret = true;
779
780 done:
781 if (skey) {
782 krb5_free_keyblock(context, skey);
783 }
784
785 return ret;
786 }
787
788
789 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
790 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
791
792 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
793 {
794 static krb5_data kdata;
795
796 kdata.data = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i));
797 kdata.length = strlen((const char *)kdata.data);
798 return &kdata;
799 }
800 #endif
801
802 /* Prototypes */
803
804 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, /* FILE:/tmp/krb5cc_0 */
805 const char *client_string, /* gd@BER.SUSE.DE */
806 const char *service_string, /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
807 time_t *expire_time)
808 {
809 krb5_error_code ret;
810 krb5_context context = NULL;
811 krb5_ccache ccache = NULL;
812 krb5_principal client = NULL;
813 krb5_creds creds, creds_in, *creds_out = NULL;
814
815 ZERO_STRUCT(creds);
816 ZERO_STRUCT(creds_in);
817
818 initialize_krb5_error_table();
819 ret = krb5_init_context(&context);
820 if (ret) {
821 goto done;
822 }
823
824 if (!ccache_string) {
825 ccache_string = krb5_cc_default_name(context);
826 }
827
828 if (!ccache_string) {
829 ret = EINVAL;
830 goto done;
831 }
832
833 DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
834
835 /* FIXME: we should not fall back to defaults */
836 ret = krb5_cc_resolve(context, discard_const_p(char, ccache_string), &ccache);
837 if (ret) {
838 goto done;
839 }
840
841 if (client_string) {
842 ret = smb_krb5_parse_name(context, client_string, &client);
843 if (ret) {
844 goto done;
845 }
846 } else {
847 ret = krb5_cc_get_principal(context, ccache, &client);
848 if (ret) {
849 goto done;
850 }
851 }
852
853 ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string));
854 if (ret) {
855 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
856 goto done;
857 }
858
859 /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
860 ret = krb5_cc_initialize(context, ccache, client);
861 if (ret) {
862 goto done;
863 }
864
865 ret = krb5_cc_store_cred(context, ccache, &creds);
866
867 if (expire_time) {
868 *expire_time = (time_t) creds.times.endtime;
869 }
870
871 done:
872 krb5_free_cred_contents(context, &creds_in);
873
874 if (creds_out) {
875 krb5_free_creds(context, creds_out);
876 } else {
877 krb5_free_cred_contents(context, &creds);
878 }
879
880 if (client) {
881 krb5_free_principal(context, client);
882 }
883 if (ccache) {
884 krb5_cc_close(context, ccache);
885 }
886 if (context) {
887 krb5_free_context(context);
888 }
889
890 return ret;
891 }
892
893 krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
894 {
895 krb5_error_code ret = 0;
896 if (addr == NULL) {
897 return ret;
898 }
899 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
900 krb5_free_addresses(context, addr->addrs);
901 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
902 ret = krb5_free_addresses(context, addr->addrs);
903 SAFE_FREE(addr->addrs);
904 #endif
905 SAFE_FREE(addr);
906 addr = NULL;
907 return ret;
908 }
909
910 #define MAX_NETBIOSNAME_LEN 16
911 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr,
912 const char *netbios_name)
913 {
914 krb5_error_code ret = 0;
915 char buf[MAX_NETBIOSNAME_LEN];
916 int len;
917 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
918 krb5_address **addrs = NULL;
919 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
920 krb5_addresses *addrs = NULL;
921 #endif
922
923 *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
924 if (*kerb_addr == NULL) {
925 return ENOMEM;
926 }
927
928 /* temporarily duplicate put_name() code here to avoid dependency
929 * issues for a 5 lines function */
930 len = strlen(netbios_name);
931 memcpy(buf, netbios_name,
932 (len < MAX_NETBIOSNAME_LEN) ? len : MAX_NETBIOSNAME_LEN - 1);
933 if (len < MAX_NETBIOSNAME_LEN - 1) {
934 memset(buf + len, ' ', MAX_NETBIOSNAME_LEN - 1 - len);
935 }
936 buf[MAX_NETBIOSNAME_LEN - 1] = 0x20;
937
938 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
939 {
940 int num_addr = 2;
941
942 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
943 if (addrs == NULL) {
944 SAFE_FREE(*kerb_addr);
945 return ENOMEM;
946 }
947
948 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
949
950 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
951 if (addrs[0] == NULL) {
952 SAFE_FREE(addrs);
953 SAFE_FREE(*kerb_addr);
954 return ENOMEM;
955 }
956
957 addrs[0]->magic = KV5M_ADDRESS;
958 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
959 addrs[0]->length = MAX_NETBIOSNAME_LEN;
960 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
961 if (addrs[0]->contents == NULL) {
962 SAFE_FREE(addrs[0]);
963 SAFE_FREE(addrs);
964 SAFE_FREE(*kerb_addr);
965 return ENOMEM;
966 }
967
968 memcpy(addrs[0]->contents, buf, addrs[0]->length);
969
970 addrs[1] = NULL;
971 }
972 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
973 {
974 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
975 if (addrs == NULL) {
976 SAFE_FREE(*kerb_addr);
977 return ENOMEM;
978 }
979
980 memset(addrs, 0, sizeof(krb5_addresses));
981
982 addrs->len = 1;
983 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
984 if (addrs->val == NULL) {
985 SAFE_FREE(addrs);
986 SAFE_FREE(kerb_addr);
987 return ENOMEM;
988 }
989
990 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
991 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
992 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
993 if (addrs->val[0].address.data == NULL) {
994 SAFE_FREE(addrs->val);
995 SAFE_FREE(addrs);
996 SAFE_FREE(*kerb_addr);
997 return ENOMEM;
998 }
999
1000 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1001 }
1002 #else
1003 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1004 #endif
1005 (*kerb_addr)->addrs = addrs;
1006
1007 return ret;
1008 }
1009
1010 void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1011 {
1012 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1013 krb5_free_error_contents(context, krberror);
1014 #else /* MIT */
1015 krb5_free_error(context, krberror);
1016 #endif
1017 }
1018
1019 krb5_error_code handle_krberror_packet(krb5_context context,
1020 krb5_data *packet)
1021 {
1022 krb5_error_code ret;
1023 bool got_error_code = false;
1024
1025 DEBUG(10,("handle_krberror_packet: got error packet\n"));
1026
1027 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1028 {
1029 krb5_error krberror;
1030
1031 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1032 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1033 error_message(ret)));
1034 return ret;
1035 }
1036
1037 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1038 ret = (krb5_error_code) krberror.error_code;
1039 got_error_code = true;
1040 }
1041
1042 smb_krb5_free_error(context, &krberror);
1043 }
1044 #else /* MIT */
1045 {
1046 krb5_error *krberror;
1047
1048 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1049 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1050 error_message(ret)));
1051 return ret;
1052 }
1053
1054 if (krberror->e_data.data == NULL) {
1055 #if defined(ERROR_TABLE_BASE_krb5)
1056 ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1057 #else
1058 ret = (krb5_error_code)krberror->error;
1059 #endif
1060 got_error_code = true;
1061 }
1062 smb_krb5_free_error(context, krberror);
1063 }
1064 #endif
1065 if (got_error_code) {
1066 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1067 error_message(ret), ret));
1068 }
1069 return ret;
1070 }
1071
1072 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1073 krb5_get_init_creds_opt **opt)
1074 {
1075 /* Heimdal or modern MIT version */
1076 return krb5_get_init_creds_opt_alloc(context, opt);
1077 }
1078
1079 void smb_krb5_get_init_creds_opt_free(krb5_context context,
1080 krb5_get_init_creds_opt *opt)
1081 {
1082 /* Modern MIT or Heimdal version */
1083 krb5_get_init_creds_opt_free(context, opt);
1084 }
1085
1086 krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1087 {
1088 return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1089 }
1090
1091 krb5_error_code smb_krb5_kt_free_entry(krb5_context context,
1092 krb5_keytab_entry *kt_entry)
1093 {
1094 /* Try krb5_free_keytab_entry_contents first, since
1095 * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
1096 * krb5_kt_free_entry but only has a prototype for the first, while the
1097 * second is considered private.
1098 */
1099 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
1100 return krb5_free_keytab_entry_contents(context, kt_entry);
1101 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
1102 return krb5_kt_free_entry(context, kt_entry);
1103 #else
1104 #error UNKNOWN_KT_FREE_FUNCTION
1105 #endif
1106 }
1107
1108
1109 /* caller needs to free etype_s */
1110 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1111 krb5_enctype enctype,
1112 char **etype_s)
1113 {
1114 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1115 return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1116 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1117 char buf[256];
1118 krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1119 if (ret) {
1120 return ret;
1121 }
1122 *etype_s = SMB_STRDUP(buf);
1123 if (!*etype_s) {
1124 return ENOMEM;
1125 }
1126 return ret;
1127 #else
1128 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1129 #endif
1130 }
1131
1132 /**********************************************************************
1133 * Open a krb5 keytab with flags, handles readonly or readwrite access and
1134 * allows to process non-default keytab names.
1135 * @param context krb5_context
1136 * @param keytab_name_req string
1137 * @param write_access bool if writable keytab is required
1138 * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1139 * @return krb5_error_code
1140 **********************************************************************/
1141
1142 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1143 #ifndef MAX_KEYTAB_NAME_LEN
1144 #define MAX_KEYTAB_NAME_LEN 1100
1145 #endif
1146
1147 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1148 const char *keytab_name_req,
1149 bool write_access,
1150 krb5_keytab *keytab)
1151 {
1152 krb5_error_code ret = 0;
1153 TALLOC_CTX *mem_ctx;
1154 char keytab_string[MAX_KEYTAB_NAME_LEN];
1155 char *kt_str = NULL;
1156 bool found_valid_name = false;
1157 const char *pragma = "FILE";
1158 const char *tmp = NULL;
1159
1160 if (!write_access && !keytab_name_req) {
1161 /* caller just wants to read the default keytab readonly, so be it */
1162 return krb5_kt_default(context, keytab);
1163 }
1164
1165 mem_ctx = talloc_init("smb_krb5_open_keytab");
1166 if (!mem_ctx) {
1167 return ENOMEM;
1168 }
1169
1170 #ifdef HAVE_WRFILE_KEYTAB
1171 if (write_access) {
1172 pragma = "WRFILE";
1173 }
1174 #endif
1175
1176 if (keytab_name_req) {
1177
1178 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1179 ret = KRB5_CONFIG_NOTENUFSPACE;
1180 goto out;
1181 }
1182
1183 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1184 (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1185 tmp = keytab_name_req;
1186 goto resolve;
1187 }
1188
1189 if (keytab_name_req[0] != '/') {
1190 ret = KRB5_KT_BADNAME;
1191 goto out;
1192 }
1193
1194 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1195 if (!tmp) {
1196 ret = ENOMEM;
1197 goto out;
1198 }
1199
1200 goto resolve;
1201 }
1202
1203 /* we need to handle more complex keytab_strings, like:
1204 * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1205
1206 ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1207 if (ret) {
1208 goto out;
1209 }
1210
1211 DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1212
1213 tmp = talloc_strdup(mem_ctx, keytab_string);
1214 if (!tmp) {
1215 ret = ENOMEM;
1216 goto out;
1217 }
1218
1219 if (strncmp(tmp, "ANY:", 4) == 0) {
1220 tmp += 4;
1221 }
1222
1223 memset(&keytab_string, '\0', sizeof(keytab_string));
1224
1225 while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1226 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1227 found_valid_name = true;
1228 tmp = kt_str;
1229 tmp += 7;
1230 }
1231
1232 if (strncmp(kt_str, "FILE:", 5) == 0) {
1233 found_valid_name = true;
1234 tmp = kt_str;
1235 tmp += 5;
1236 }
1237
1238 if (tmp[0] == '/') {
1239 /* Treat as a FILE: keytab definition. */
1240 found_valid_name = true;
1241 }
1242
1243 if (found_valid_name) {
1244 if (tmp[0] != '/') {
1245 ret = KRB5_KT_BADNAME;
1246 goto out;
1247 }
1248
1249 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1250 if (!tmp) {
1251 ret = ENOMEM;
1252 goto out;
1253 }
1254 break;
1255 }
1256 }
1257
1258 if (!found_valid_name) {
1259 ret = KRB5_KT_UNKNOWN_TYPE;
1260 goto out;
1261 }
1262
1263 resolve:
1264 DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1265 ret = krb5_kt_resolve(context, tmp, keytab);
1266
1267 out:
1268 TALLOC_FREE(mem_ctx);
1269 return ret;
1270 }
1271
1272 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1273 krb5_context context,
1274 krb5_keytab keytab,
1275 const char **keytab_name)
1276 {
1277 char keytab_string[MAX_KEYTAB_NAME_LEN];
1278 krb5_error_code ret = 0;
1279
1280 ret = krb5_kt_get_name(context, keytab,
1281 keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1282 if (ret) {
1283 return ret;
1284 }
1285
1286 *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1287 if (!*keytab_name) {
1288 return ENOMEM;
1289 }
1290
1291 return ret;
1292 }
1293
1294 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1295 defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1296 defined(HAVE_KRB5_GET_CREDS)
1297 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1298 krb5_ccache ccache,
1299 krb5_principal me,
1300 krb5_principal server,
1301 krb5_principal impersonate_princ,
1302 krb5_creds **out_creds)
1303 {
1304 krb5_error_code ret;
1305 krb5_get_creds_opt opt;
1306
1307 ret = krb5_get_creds_opt_alloc(context, &opt);
1308 if (ret) {
1309 goto done;
1310 }
1311 krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1312
1313 if (impersonate_princ) {
1314 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1315 impersonate_princ);
1316 if (ret) {
1317 goto done;
1318 }
1319 }
1320
1321 ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1322 if (ret) {
1323 goto done;
1324 }
1325
1326 done:
1327 if (opt) {
1328 krb5_get_creds_opt_free(context, opt);
1329 }
1330 return ret;
1331 }
1332 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1333
1334 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1335 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1336 krb5_ccache ccache,
1337 krb5_principal me,
1338 krb5_principal server,
1339 krb5_principal impersonate_princ,
1340 krb5_creds **out_creds)
1341 {
1342 krb5_error_code ret;
1343 krb5_creds in_creds;
1344
1345 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1346 krb5_error_code KRB5_CALLCONV
1347 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1348 krb5_ccache ccache, krb5_creds *in_creds,
1349 krb5_data *subject_cert,
1350 krb5_creds **out_creds);
1351 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1352
1353 ZERO_STRUCT(in_creds);
1354
1355 if (impersonate_princ) {
1356
1357 in_creds.server = me;
1358 in_creds.client = impersonate_princ;
1359
1360 ret = krb5_get_credentials_for_user(context,
1361 0, /* krb5_flags options */
1362 ccache,
1363 &in_creds,
1364 NULL, /* krb5_data *subject_cert */
1365 out_creds);
1366 } else {
1367 in_creds.client = me;
1368 in_creds.server = server;
1369
1370 ret = krb5_get_credentials(context, 0, ccache,
1371 &in_creds, out_creds);
1372 }
1373
1374 return ret;
1375 }
1376 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1377
1378 /*
1379 * smb_krb5_get_credentials
1380 *
1381 * @brief Get krb5 credentials for a server
1382 *
1383 * @param[in] context An initialized krb5_context
1384 * @param[in] ccache An initialized krb5_ccache
1385 * @param[in] me The krb5_principal of the caller
1386 * @param[in] server The krb5_principal of the requested service
1387 * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1388 * @param[out] out_creds The returned krb5_creds structure
1389 * @return krb5_error_code
1390 *
1391 */
1392 krb5_error_code smb_krb5_get_credentials(krb5_context context,
1393 krb5_ccache ccache,
1394 krb5_principal me,
1395 krb5_principal server,
1396 krb5_principal impersonate_princ,
1397 krb5_creds **out_creds)
1398 {
1399 krb5_error_code ret;
1400 krb5_creds *creds = NULL;
1401
1402 *out_creds = NULL;
1403
1404 if (impersonate_princ) {
1405 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
1406 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
1407 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
1408 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
1409 #else
1410 ret = ENOTSUP;
1411 #endif
1412 } else {
1413 krb5_creds in_creds;
1414
1415 ZERO_STRUCT(in_creds);
1416
1417 in_creds.client = me;
1418 in_creds.server = server;
1419
1420 ret = krb5_get_credentials(context, 0, ccache,
1421 &in_creds, &creds);
1422 }
1423 if (ret) {
1424 goto done;
1425 }
1426
1427 if (out_creds) {
1428 *out_creds = creds;
1429 }
1430
1431 done:
1432 if (creds && ret) {
1433 krb5_free_creds(context, creds);
1434 }
1435
1436 return ret;
1437 }
1438
1439 krb5_error_code smb_krb5_keyblock_init_contents(krb5_context context,
1440 krb5_enctype enctype,
1441 const void *data,
1442 size_t length,
1443 krb5_keyblock *key)
1444 {
1445 #if defined(HAVE_KRB5_KEYBLOCK_INIT)
1446 return krb5_keyblock_init(context, enctype, data, length, key);
1447 #else
1448 memset(key, 0, sizeof(krb5_keyblock));
1449 KRB5_KEY_DATA(key) = SMB_MALLOC(length);
1450 if (NULL == KRB5_KEY_DATA(key)) {
1451 return ENOMEM;
1452 }
1453 memcpy(KRB5_KEY_DATA(key), data, length);
1454 KRB5_KEY_LENGTH(key) = length;
1455 KRB5_KEY_TYPE(key) = enctype;
1456 return 0;
1457 #endif
1458 }
1459
1460 /*
1461 simulate a kinit, putting the tgt in the given credentials cache.
1462 Orignally by remus@snapserver.com
1463
1464 This version is built to use a keyblock, rather than needing the
1465 original password.
1466
1467 The impersonate_principal is the principal if NULL, or the principal
1468 to impersonate
1469
1470 The target_service defaults to the krbtgt if NULL, but could be
1471 kpasswd/realm or the local service (if we are doing s4u2self)
1472 */
1473 krb5_error_code kerberos_kinit_keyblock_cc(krb5_context ctx, krb5_ccache cc,
1474 krb5_principal principal,
1475 krb5_keyblock *keyblock,
1476 const char *target_service,
1477 krb5_get_init_creds_opt *krb_options,
1478 time_t *expire_time,
1479 time_t *kdc_time)
1480 {
1481 krb5_error_code code = 0;
1482 krb5_creds my_creds;
1483
1484 #if defined(HAVE_KRB5_GET_INIT_CREDS_KEYBLOCK)
1485 code = krb5_get_init_creds_keyblock(ctx, &my_creds, principal,
1486 keyblock, 0, target_service,
1487 krb_options);
1488 #elif defined(HAVE_KRB5_GET_INIT_CREDS_KEYTAB)
1489 {
1490 #define SMB_CREDS_KEYTAB "MEMORY:tmp_smb_creds_XXXXXX"
1491 char tmp_name[sizeof(SMB_CREDS_KEYTAB)];
1492 krb5_keytab_entry entry;
1493 krb5_keytab keytab;
1494
1495 memset(&entry, 0, sizeof(entry));
1496 entry.principal = principal;
1497 *(KRB5_KT_KEY(&entry)) = *keyblock;
1498
1499 memcpy(tmp_name, SMB_CREDS_KEYTAB, sizeof(SMB_CREDS_KEYTAB));
1500 mktemp(tmp_name);
1501 if (tmp_name[0] == 0) {
1502 return KRB5_KT_BADNAME;
1503 }
1504 code = krb5_kt_resolve(ctx, tmp_name, &keytab);
1505 if (code) {
1506 return code;
1507 }
1508
1509 code = krb5_kt_add_entry(ctx, keytab, &entry);
1510 if (code) {
1511 (void)krb5_kt_close(ctx, keytab);
1512 goto done;
1513 }
1514
1515 code = krb5_get_init_creds_keytab(ctx, &my_creds, principal,
1516 keytab, 0, target_service,
1517 krb_options);
1518 (void)krb5_kt_close(ctx, keytab);
1519 }
1520 #else
1521 #error krb5_get_init_creds_keyblock not available!
1522 #endif
1523 if (code) {
1524 return code;
1525 }
1526
1527 code = krb5_cc_initialize(ctx, cc, principal);
1528 if (code) {
1529 goto done;
1530 }
1531
1532 code = krb5_cc_store_cred(ctx, cc, &my_creds);
1533 if (code) {
1534 goto done;
1535 }
1536
1537 if (expire_time) {
1538 *expire_time = (time_t) my_creds.times.endtime;
1539 }
1540
1541 if (kdc_time) {
1542 *kdc_time = (time_t) my_creds.times.starttime;
1543 }
1544
1545 code = 0;
1546 done:
1547 krb5_free_cred_contents(ctx, &my_creds);
1548 return code;
1549 }
1550
1551 krb5_error_code kerberos_kinit_password_cc(krb5_context ctx, krb5_ccache cc,
1552 krb5_principal principal,
1553 const char *password,
1554 const char *target_service,
1555 krb5_get_init_creds_opt *krb_options,
1556 time_t *expire_time,
1557 time_t *kdc_time)
1558 {
1559 krb5_error_code code = 0;
1560 krb5_creds my_creds;
1561
1562 code = krb5_get_init_creds_password(ctx, &my_creds, principal,
1563 password, NULL, NULL, 0,
1564 target_service, krb_options);
1565 if (code) {
1566 return code;
1567 }
1568
1569 code = krb5_cc_initialize(ctx, cc, principal);
1570 if (code) {
1571 goto done;
1572 }
1573
1574 code = krb5_cc_store_cred(ctx, cc, &my_creds);
1575 if (code) {
1576 goto done;
1577 }
1578
1579 if (expire_time) {
1580 *expire_time = (time_t) my_creds.times.endtime;
1581 }
1582
1583 if (kdc_time) {
1584 *kdc_time = (time_t) my_creds.times.starttime;
1585 }
1586
1587 code = 0;
1588 done:
1589 krb5_free_cred_contents(ctx, &my_creds);
1590 return code;
1591 }
1592
1593 #ifdef SAMBA4_USES_HEIMDAL
1594 /*
1595 simulate a kinit, putting the tgt in the given credentials cache.
1596 Orignally by remus@snapserver.com
1597
1598 The impersonate_principal is the principal
1599
1600 The self_service, should be the local service (for S4U2Self if
1601 impersonate_principal is given).
1602
1603 The target_service defaults to the krbtgt if NULL, but could be
1604 kpasswd/realm or a remote service (for S4U2Proxy)
1605
1606 */
1607 krb5_error_code kerberos_kinit_s4u2_cc(krb5_context ctx,
1608 krb5_ccache store_cc,
1609 krb5_principal init_principal,
1610 const char *init_password,
1611 krb5_principal impersonate_principal,
1612 const char *self_service,
1613 const char *target_service,
1614 krb5_get_init_creds_opt *krb_options,
1615 time_t *expire_time,
1616 time_t *kdc_time)
1617 {
1618 krb5_error_code code = 0;
1619 krb5_get_creds_opt options;
1620 krb5_principal store_principal;
1621 krb5_creds store_creds;
1622 krb5_creds *s4u2self_creds;
1623 Ticket s4u2self_ticket;
1624 size_t s4u2self_ticketlen;
1625 krb5_creds *s4u2proxy_creds;
1626 krb5_principal self_princ;
1627 bool s4u2proxy;
1628 krb5_principal target_princ;
1629 krb5_ccache tmp_cc;
1630 const char *self_realm;
1631 krb5_principal blacklist_principal = NULL;
1632 krb5_principal whitelist_principal = NULL;
1633
1634 code = krb5_get_init_creds_password(ctx, &store_creds,
1635 init_principal,
1636 init_password,
1637 NULL, NULL,
1638 0,
1639 NULL,
1640 krb_options);
1641 if (code != 0) {
1642 return code;
1643 }
1644
1645 store_principal = init_principal;
1646
1647 /*
1648 * We are trying S4U2Self now:
1649 *
1650 * As we do not want to expose our TGT in the
1651 * krb5_ccache, which is also holds the impersonated creds.
1652 *
1653 * Some low level krb5/gssapi function might use the TGT
1654 * identity and let the client act as our machine account.
1655 *
1656 * We need to avoid that and use a temporary krb5_ccache
1657 * in order to pass our TGT to the krb5_get_creds() function.
1658 */
1659 code = krb5_cc_new_unique(ctx, NULL, NULL, &tmp_cc);
1660 if (code != 0) {
1661 krb5_free_cred_contents(ctx, &store_creds);
1662 return code;
1663 }
1664
1665 code = krb5_cc_initialize(ctx, tmp_cc, store_creds.client);
1666 if (code != 0) {
1667 krb5_cc_destroy(ctx, tmp_cc);
1668 krb5_free_cred_contents(ctx, &store_creds);
1669 return code;
1670 }
1671
1672 code = krb5_cc_store_cred(ctx, tmp_cc, &store_creds);
1673 if (code != 0) {
1674 krb5_free_cred_contents(ctx, &store_creds);
1675 krb5_cc_destroy(ctx, tmp_cc);
1676 return code;
1677 }
1678
1679 /*
1680 * we need to remember the client principal of our
1681 * TGT and make sure the KDC does not return this
1682 * in the impersonated tickets. This can happen
1683 * if the KDC does not support S4U2Self and S4U2Proxy.
1684 */
1685 blacklist_principal = store_creds.client;
1686 store_creds.client = NULL;
1687 krb5_free_cred_contents(ctx, &store_creds);
1688
1689 /*
1690 * Check if we also need S4U2Proxy or if S4U2Self is
1691 * enough in order to get a ticket for the target.
1692 */
1693 if (target_service == NULL) {
1694 s4u2proxy = false;
1695 } else if (strcmp(target_service, self_service) == 0) {
1696 s4u2proxy = false;
1697 } else {
1698 s4u2proxy = true;
1699 }
1700
1701 /*
1702 * For S4U2Self we need our own service principal,
1703 * which belongs to our own realm (available on
1704 * our client principal).
1705 */
1706 self_realm = krb5_principal_get_realm(ctx, init_principal);
1707
1708 code = krb5_parse_name(ctx, self_service, &self_princ);
1709 if (code != 0) {
1710 krb5_free_principal(ctx, blacklist_principal);
1711 krb5_cc_destroy(ctx, tmp_cc);
1712 return code;
1713 }
1714
1715 code = krb5_principal_set_realm(ctx, self_princ, self_realm);
1716 if (code != 0) {
1717 krb5_free_principal(ctx, blacklist_principal);
1718 krb5_free_principal(ctx, self_princ);
1719 krb5_cc_destroy(ctx, tmp_cc);
1720 return code;
1721 }
1722
1723 code = krb5_get_creds_opt_alloc(ctx, &options);
1724 if (code != 0) {
1725 krb5_free_principal(ctx, blacklist_principal);
1726 krb5_free_principal(ctx, self_princ);
1727 krb5_cc_destroy(ctx, tmp_cc);
1728 return code;
1729 }
1730
1731 if (s4u2proxy) {
1732 /*
1733 * If we want S4U2Proxy, we need the forwardable flag
1734 * on the S4U2Self ticket.
1735 */
1736 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
1737 }
1738
1739 code = krb5_get_creds_opt_set_impersonate(ctx, options,
1740 impersonate_principal);
1741 if (code != 0) {
1742 krb5_get_creds_opt_free(ctx, options);
1743 krb5_free_principal(ctx, blacklist_principal);
1744 krb5_free_principal(ctx, self_princ);
1745 krb5_cc_destroy(ctx, tmp_cc);
1746 return code;
1747 }
1748
1749 code = krb5_get_creds(ctx, options, tmp_cc,
1750 self_princ, &s4u2self_creds);
1751 krb5_get_creds_opt_free(ctx, options);
1752 krb5_free_principal(ctx, self_princ);
1753 if (code != 0) {
1754 krb5_free_principal(ctx, blacklist_principal);
1755 krb5_cc_destroy(ctx, tmp_cc);
1756 return code;
1757 }
1758
1759 if (!s4u2proxy) {
1760 krb5_cc_destroy(ctx, tmp_cc);
1761
1762 /*
1763 * Now make sure we store the impersonated principal
1764 * and creds instead of the TGT related stuff
1765 * in the krb5_ccache of the caller.
1766 */
1767 code = krb5_copy_creds_contents(ctx, s4u2self_creds,
1768 &store_creds);
1769 krb5_free_creds(ctx, s4u2self_creds);
1770 if (code != 0) {
1771 return code;
1772 }
1773
1774 /*
1775 * It's important to store the principal the KDC
1776 * returned, as otherwise the caller would not find
1777 * the S4U2Self ticket in the krb5_ccache lookup.
1778 */
1779 store_principal = store_creds.client;
1780 goto store;
1781 }
1782
1783 /*
1784 * We are trying S4U2Proxy:
1785 *
1786 * We need the ticket from the S4U2Self step
1787 * and our TGT in order to get the delegated ticket.
1788 */
1789 code = decode_Ticket((const uint8_t *)s4u2self_creds->ticket.data,
1790 s4u2self_creds->ticket.length,
1791 &s4u2self_ticket,
1792 &s4u2self_ticketlen);
1793 if (code != 0) {
1794 krb5_free_creds(ctx, s4u2self_creds);
1795 krb5_free_principal(ctx, blacklist_principal);
1796 krb5_cc_destroy(ctx, tmp_cc);
1797 return code;
1798 }
1799
1800 /*
1801 * we need to remember the client principal of the
1802 * S4U2Self stage and as it needs to match the one we
1803 * will get for the S4U2Proxy stage. We need this
1804 * in order to detect KDCs which does not support S4U2Proxy.
1805 */
1806 whitelist_principal = s4u2self_creds->client;
1807 s4u2self_creds->client = NULL;
1808 krb5_free_creds(ctx, s4u2self_creds);
1809
1810 /*
1811 * For S4U2Proxy we also got a target service principal,
1812 * which also belongs to our own realm (available on
1813 * our client principal).
1814 */
1815 code = krb5_parse_name(ctx, target_service, &target_princ);
1816 if (code != 0) {
1817 free_Ticket(&s4u2self_ticket);
1818 krb5_free_principal(ctx, whitelist_principal);
1819 krb5_free_principal(ctx, blacklist_principal);
1820 krb5_cc_destroy(ctx, tmp_cc);
1821 return code;
1822 }
1823
1824 code = krb5_principal_set_realm(ctx, target_princ, self_realm);
1825 if (code != 0) {
1826 free_Ticket(&s4u2self_ticket);
1827 krb5_free_principal(ctx, target_princ);
1828 krb5_free_principal(ctx, whitelist_principal);
1829 krb5_free_principal(ctx, blacklist_principal);
1830 krb5_cc_destroy(ctx, tmp_cc);
1831 return code;
1832 }
1833
1834 code = krb5_get_creds_opt_alloc(ctx, &options);
1835 if (code != 0) {
1836 free_Ticket(&s4u2self_ticket);
1837 krb5_free_principal(ctx, target_princ);
1838 krb5_free_principal(ctx, whitelist_principal);
1839 krb5_free_principal(ctx, blacklist_principal);
1840 krb5_cc_destroy(ctx, tmp_cc);
1841 return code;
1842 }
1843
1844 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
1845 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_CONSTRAINED_DELEGATION);
1846
1847 code = krb5_get_creds_opt_set_ticket(ctx, options, &s4u2self_ticket);
1848 free_Ticket(&s4u2self_ticket);
1849 if (code != 0) {
1850 krb5_get_creds_opt_free(ctx, options);
1851 krb5_free_principal(ctx, target_princ);
1852 krb5_free_principal(ctx, whitelist_principal);
1853 krb5_free_principal(ctx, blacklist_principal);
1854 krb5_cc_destroy(ctx, tmp_cc);
1855 return code;
1856 }
1857
1858 code = krb5_get_creds(ctx, options, tmp_cc,
1859 target_princ, &s4u2proxy_creds);
1860 krb5_get_creds_opt_free(ctx, options);
1861 krb5_free_principal(ctx, target_princ);
1862 krb5_cc_destroy(ctx, tmp_cc);
1863 if (code != 0) {
1864 krb5_free_principal(ctx, whitelist_principal);
1865 krb5_free_principal(ctx, blacklist_principal);
1866 return code;
1867 }
1868
1869 /*
1870 * Now make sure we store the impersonated principal
1871 * and creds instead of the TGT related stuff
1872 * in the krb5_ccache of the caller.
1873 */
1874 code = krb5_copy_creds_contents(ctx, s4u2proxy_creds,
1875 &store_creds);
1876 krb5_free_creds(ctx, s4u2proxy_creds);
1877 if (code != 0) {
1878 krb5_free_principal(ctx, whitelist_principal);
1879 krb5_free_principal(ctx, blacklist_principal);
1880 return code;
1881 }
1882
1883 /*
1884 * It's important to store the principal the KDC
1885 * returned, as otherwise the caller would not find
1886 * the S4U2Self ticket in the krb5_ccache lookup.
1887 */
1888 store_principal = store_creds.client;
1889
1890 store:
1891 if (blacklist_principal &&
1892 krb5_principal_compare(ctx, store_creds.client, blacklist_principal)) {
1893 char *sp = NULL;
1894 char *ip = NULL;
1895
1896 code = krb5_unparse_name(ctx, blacklist_principal, &sp);
1897 if (code != 0) {
1898 sp = NULL;
1899 }
1900 code = krb5_unparse_name(ctx, impersonate_principal, &ip);
1901 if (code != 0) {
1902 ip = NULL;
1903 }
1904 DEBUG(1, ("kerberos_kinit_password_cc: "
1905 "KDC returned self principal[%s] while impersonating [%s]\n",
1906 sp?sp:"<no memory>",
1907 ip?ip:"<no memory>"));
1908
1909 SAFE_FREE(sp);
1910 SAFE_FREE(ip);
1911
1912 krb5_free_principal(ctx, whitelist_principal);
1913 krb5_free_principal(ctx, blacklist_principal);
1914 krb5_free_cred_contents(ctx, &store_creds);
1915 return KRB5_FWD_BAD_PRINCIPAL;
1916 }
1917 if (blacklist_principal) {
1918 krb5_free_principal(ctx, blacklist_principal);
1919 }
1920
1921 if (whitelist_principal &&
1922 !krb5_principal_compare(ctx, store_creds.client, whitelist_principal)) {
1923 char *sp = NULL;
1924 char *ep = NULL;
1925
1926 code = krb5_unparse_name(ctx, store_creds.client, &sp);
1927 if (code != 0) {
1928 sp = NULL;
1929 }
1930 code = krb5_unparse_name(ctx, whitelist_principal, &ep);
1931 if (code != 0) {
1932 ep = NULL;
1933 }
1934 DEBUG(1, ("kerberos_kinit_password_cc: "
1935 "KDC returned wrong principal[%s] we expected [%s]\n",
1936 sp?sp:"<no memory>",
1937 ep?ep:"<no memory>"));
1938
1939 SAFE_FREE(sp);
1940 SAFE_FREE(ep);
1941
1942 krb5_free_principal(ctx, whitelist_principal);
1943 krb5_free_cred_contents(ctx, &store_creds);
1944 return KRB5_FWD_BAD_PRINCIPAL;
1945 }
1946 if (whitelist_principal) {
1947 krb5_free_principal(ctx, whitelist_principal);
1948 }
1949
1950 code = krb5_cc_initialize(ctx, store_cc, store_principal);
1951 if (code != 0) {
1952 krb5_free_cred_contents(ctx, &store_creds);
1953 return code;
1954 }
1955
1956 code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
1957 if (code != 0) {
1958 krb5_free_cred_contents(ctx, &store_creds);
1959 return code;
1960 }
1961
1962 if (expire_time) {
1963 *expire_time = (time_t) store_creds.times.endtime;
1964 }
1965
1966 if (kdc_time) {
1967 *kdc_time = (time_t) store_creds.times.starttime;
1968 }
1969
1970 krb5_free_cred_contents(ctx, &store_creds);
1971
1972 return 0;
1973 }
1974 #endif
1975
1976 #if !defined(HAVE_KRB5_MAKE_PRINCIPAL) && defined(HAVE_KRB5_BUILD_PRINCIPAL_ALLOC_VA)
1977 krb5_error_code smb_krb5_make_principal(krb5_context context,
1978 krb5_principal *principal,
1979 const char *_realm, ...)
1980 {
1981 krb5_error_code code;
1982 bool free_realm;
1983 char *realm;
1984 va_list ap;
1985
1986 if (_realm) {
1987 realm = _realm;
1988 free_realm = false;
1989 } else {
1990 code = krb5_get_default_realm(context, &realm);
1991 if (code) {
1992 return code;
1993 }
1994 free_realm = true;
1995 }
1996
1997 va_start(ap, _realm);
1998 code = krb5_build_principal_alloc_va(context, principal,
1999 strlen(realm), realm,
2000 ap);
2001 va_end(ap);
2002
2003 if (free_realm) {
2004 krb5_free_default_realm(context, &realm);
2005 }
2006
2007 return code;
2008 }
2009 #endif
2010
2011 #if !defined(HAVE_KRB5_CC_GET_LIFETIME) && defined(HAVE_KRB5_CC_RETRIEVE_CRED)
2012 /**
2013 * @brief Get the lifetime of the initial ticket in the cache.
2014 *
2015 * @param[in] context The kerberos context.
2016 *
2017 * @param[in] id The credential cache to get the ticket lifetime.
2018 *
2019 * @param[out] t A pointer to a time value to store the lifetime.
2020 *
2021 * @return 0 on success, a krb5_error_code on error.
2022 */
2023 krb5_error_code smb_krb5_cc_get_lifetime(krb5_context context,
2024 krb5_ccache id,
2025 time_t *t)
2026 {
2027 krb5_cc_cursor cursor;
2028 krb5_error_code kerr;
2029 krb5_creds cred;
2030 krb5_timestamp now;
2031
2032 *t = 0;
2033
2034 kerr = krb5_timeofday(context, &now);
2035 if (kerr) {
2036 return kerr;
2037 }
2038
2039 kerr = krb5_cc_start_seq_get(context, id, &cursor);
2040 if (kerr) {
2041 return kerr;
2042 }
2043
2044 while ((kerr = krb5_cc_next_cred(context, id, &cursor, &cred)) == 0) {
2045 #ifndef HAVE_FLAGS_IN_KRB5_CREDS
2046 if (cred.ticket_flags & TKT_FLG_INITIAL) {
2047 #else
2048 if (cred.flags.b.initial) {
2049 #endif
2050 if (now < cred.times.endtime) {
2051 *t = (time_t) (cred.times.endtime - now);
2052 }
2053 krb5_free_cred_contents(context, &cred);
2054 break;
2055 }
2056 krb5_free_cred_contents(context, &cred);
2057 }
2058
2059 krb5_cc_end_seq_get(context, id, &cursor);
2060
2061 return kerr;
2062 }
2063 #endif /* HAVE_KRB5_CC_GET_LIFETIME */
2064
2065 #if !defined(HAVE_KRB5_FREE_CHECKSUM_CONTENTS) && defined(HAVE_FREE_CHECKSUM)
2066 void smb_krb5_free_checksum_contents(krb5_context ctx, krb5_checksum *cksum)
2067 {
2068 free_Checksum(cksum);
2069 }
2070 #endif
2071
2072 krb5_error_code smb_krb5_make_pac_checksum(TALLOC_CTX *mem_ctx,
2073 DATA_BLOB *pac_data,
2074 krb5_context context,
2075 const krb5_keyblock *keyblock,
2076 uint32_t *sig_type,
2077 DATA_BLOB *sig_blob)
2078 {
2079 krb5_error_code ret;
2080 krb5_checksum cksum;
2081 #if defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CREATE_CHECKSUM)
2082 krb5_crypto crypto;
2083
2084
2085 ret = krb5_crypto_init(context,
2086 keyblock,
2087 0,
2088 &crypto);
2089 if (ret) {
2090 DEBUG(0,("krb5_crypto_init() failed: %s\n",
2091 smb_get_krb5_error_message(context, ret, mem_ctx)));
2092 return ret;
2093 }
2094 ret = krb5_create_checksum(context,
2095 crypto,
2096 KRB5_KU_OTHER_CKSUM,
2097 0,
2098 pac_data->data,
2099 pac_data->length,
2100 &cksum);
2101 if (ret) {
2102 DEBUG(2, ("PAC Verification failed: %s\n",
2103 smb_get_krb5_error_message(context, ret, mem_ctx)));
2104 }
2105
2106 krb5_crypto_destroy(context, crypto);
2107
2108 if (ret) {
2109 return ret;
2110 }
2111
2112 *sig_type = cksum.cksumtype;
2113 *sig_blob = data_blob_talloc(mem_ctx,
2114 cksum.checksum.data,
2115 cksum.checksum.length);
2116 #elif defined(HAVE_KRB5_C_MAKE_CHECKSUM)
2117 krb5_data input;
2118
2119 input.data = (char *)pac_data->data;
2120 input.length = pac_data->length;
2121
2122 ret = krb5_c_make_checksum(context,
2123 0,
2124 keyblock,
2125 KRB5_KEYUSAGE_APP_DATA_CKSUM,
2126 &input,
2127 &cksum);
2128 if (ret) {
2129 DEBUG(2, ("PAC Verification failed: %s\n",
2130 smb_get_krb5_error_message(context, ret, mem_ctx)));
2131 return ret;
2132 }
2133
2134 *sig_type = cksum.checksum_type;
2135 *sig_blob = data_blob_talloc(mem_ctx,
2136 cksum.contents,
2137 cksum.length);
2138
2139 #else
2140 #error krb5_create_checksum or krb5_c_make_checksum not available
2141 #endif /* HAVE_KRB5_C_MAKE_CHECKSUM */
2142 smb_krb5_free_checksum_contents(context, &cksum);
2143
2144 return 0;
2145 }
2146
2147
2148 /*
2149 * smb_krb5_principal_get_realm
2150 *
2151 * @brief Get realm of a principal
2152 *
2153 * @param[in] context The krb5_context
2154 * @param[in] principal The principal
2155 * @return pointer to the realm
2156 *
2157 */
2158
2159 char *smb_krb5_principal_get_realm(krb5_context context,
2160 krb5_principal principal)
2161 {
2162 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2163 return discard_const_p(char, krb5_principal_get_realm(context, principal));
2164 #elif defined(krb5_princ_realm) /* MIT */
2165 krb5_data *realm;
2166 realm = krb5_princ_realm(context, principal);
2167 return discard_const_p(char, realm->data);
2168 #else
2169 return NULL;
2170 #endif
2171 }
2172
2173 /************************************************************************
2174 Routine to get the default realm from the kerberos credentials cache.
2175 Caller must free if the return value is not NULL.
2176 ************************************************************************/
2177
2178 static char *smb_krb5_get_default_realm_from_ccache(TALLOC_CTX *mem_ctx)
2179 {
2180 char *realm = NULL;
2181 krb5_context ctx = NULL;
2182 krb5_ccache cc = NULL;
2183 krb5_principal princ = NULL;
2184
2185 initialize_krb5_error_table();
2186 if (krb5_init_context(&ctx)) {
2187 return NULL;
2188 }
2189
2190 DEBUG(5,("kerberos_get_default_realm_from_ccache: "
2191 "Trying to read krb5 cache: %s\n",
2192 krb5_cc_default_name(ctx)));
2193 if (krb5_cc_default(ctx, &cc)) {
2194 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
2195 "failed to read default cache\n"));
2196 goto out;
2197 }
2198 if (krb5_cc_get_principal(ctx, cc, &princ)) {
2199 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
2200 "failed to get default principal\n"));
2201 goto out;
2202 }
2203
2204 #if defined(HAVE_KRB5_PRINCIPAL_GET_REALM)
2205 realm = talloc_strdup(mem_ctx, krb5_principal_get_realm(ctx, princ));
2206 #elif defined(HAVE_KRB5_PRINC_REALM)
2207 {
2208 krb5_data *realm_data = krb5_princ_realm(ctx, princ);
2209 realm = talloc_strndup(mem_ctx, realm_data->data, realm_data->length);
2210 }
2211 #endif
2212
2213 out:
2214
2215 if (ctx) {
2216 if (princ) {
2217 krb5_free_principal(ctx, princ);
2218 }
2219 if (cc) {
2220 krb5_cc_close(ctx, cc);
2221 }
2222 krb5_free_context(ctx);
2223 }
2224
2225 return realm;
2226 }
2227
2228 /************************************************************************
2229 Routine to get the realm from a given DNS name.
2230 ************************************************************************/
2231
2232 static char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
2233 const char *hostname)
2234 {
2235 #if defined(HAVE_KRB5_REALM_TYPE)
2236 /* Heimdal. */
2237 krb5_realm *realm_list = NULL;
2238 #else
2239 /* MIT */
2240 char **realm_list = NULL;
2241 #endif
2242 char *realm = NULL;
2243 krb5_error_code kerr;
2244 krb5_context ctx = NULL;
2245
2246 initialize_krb5_error_table();
2247 if (krb5_init_context(&ctx)) {
2248 return NULL;
2249 }
2250
2251 kerr = krb5_get_host_realm(ctx, hostname, &realm_list);
2252 if (kerr != 0) {
2253 DEBUG(3,("kerberos_get_realm_from_hostname %s: "
2254 "failed %s\n",
2255 hostname ? hostname : "(NULL)",
2256 error_message(kerr) ));
2257 goto out;
2258 }
2259
2260 if (realm_list && realm_list[0]) {
2261 realm = talloc_strdup(mem_ctx, realm_list[0]);
2262 }
2263
2264 out:
2265
2266 if (ctx) {
2267 if (realm_list) {
2268 krb5_free_host_realm(ctx, realm_list);
2269 realm_list = NULL;
2270 }
2271 krb5_free_context(ctx);
2272 ctx = NULL;
2273 }
2274 return realm;
2275 }
2276
2277 char *kerberos_get_principal_from_service_hostname(TALLOC_CTX *mem_ctx,
2278 const char *service,
2279 const char *remote_name,
2280 const char *default_realm)
2281 {
2282 char *realm = NULL;
2283 char *host = NULL;
2284 char *principal;
2285 host = strchr_m(remote_name, '.');
2286 if (host) {
2287 /* DNS name. */
2288 realm = smb_krb5_get_realm_from_hostname(talloc_tos(),
2289 remote_name);
2290 } else {
2291 /* NetBIOS name - use our realm. */
2292 realm = smb_krb5_get_default_realm_from_ccache(talloc_tos());
2293 }
2294
2295 if (realm == NULL || *realm == '\0') {
2296 realm = talloc_strdup(talloc_tos(), default_realm);
2297 if (!realm) {
2298 return NULL;
2299 }
2300 DEBUG(3,("kerberos_get_principal_from_service_hostname: "
2301 "cannot get realm from, "
2302 "desthost %s or default ccache. Using default "
2303 "smb.conf realm %s\n",
2304 remote_name,
2305 realm));
2306 }
2307
2308 principal = talloc_asprintf(mem_ctx,
2309 "%s/%s@%s",
2310 service, remote_name,
2311 realm);
2312 TALLOC_FREE(realm);
2313 return principal;
2314 }
2315
2316 char *smb_get_krb5_error_message(krb5_context context,
2317 krb5_error_code code,
2318 TALLOC_CTX *mem_ctx)
2319 {
2320 char *ret;
2321
2322 #if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
2323 const char *context_error = krb5_get_error_message(context, code);
2324 if (context_error) {
2325 ret = talloc_asprintf(mem_ctx, "%s: %s",
2326 error_message(code), context_error);
2327 krb5_free_error_message(context, context_error);
2328 return ret;
2329 }
2330 #endif
2331 ret = talloc_strdup(mem_ctx, error_message(code));
2332 return ret;
2333 }
2334
2335 #else /* HAVE_KRB5 */
2336 /* this saves a few linking headaches */
2337 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
2338 const char *principal, time_t time_offset,
2339 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
2340 uint32_t extra_ap_opts,
2341 const char *ccname, time_t *tgs_expire,
2342 const char *impersonate_princ_s)
2343 {
2344 DEBUG(0,("NO KERBEROS SUPPORT\n"));
2345 return 1;
2346 }
2347
2348 #endif /* HAVE_KRB5 */
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