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krb5samba: Add krb5_free_checksum_contents wrapper
[Samba/bjacke.git] / lib / krb5_wrap / krb5_samba.c
blobcbfaa9c9fb90fcf1b4226f5ff08c709d7af134ea
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 /*
1440 * smb_krb5_get_creds
1441 *
1442 * @brief Get krb5 credentials for a server
1443 *
1444 * @param[in] server_s The string name of the service
1445 * @param[in] time_offset The offset to the KDCs time in seconds (optional)
1446 * @param[in] cc The krb5 credential cache string name (optional)
1447 * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
1448 * @param[out] creds_p The returned krb5_creds structure
1449 * @return krb5_error_code
1450 *
1451 */
1452 krb5_error_code smb_krb5_get_creds(const char *server_s,
1453 time_t time_offset,
1454 const char *cc,
1455 const char *impersonate_princ_s,
1456 krb5_creds **creds_p)
1457 {
1458 krb5_error_code ret;
1459 krb5_context context = NULL;
1460 krb5_principal me = NULL;
1461 krb5_principal server = NULL;
1462 krb5_principal impersonate_princ = NULL;
1463 krb5_creds *creds = NULL;
1464 krb5_ccache ccache = NULL;
1465
1466 *creds_p = NULL;
1467
1468 initialize_krb5_error_table();
1469 ret = krb5_init_context(&context);
1470 if (ret) {
1471 goto done;
1472 }
1473
1474 if (time_offset != 0) {
1475 krb5_set_real_time(context, time(NULL) + time_offset, 0);
1476 }
1477
1478 ret = krb5_cc_resolve(context, cc ? cc :
1479 krb5_cc_default_name(context), &ccache);
1480 if (ret) {
1481 goto done;
1482 }
1483
1484 ret = krb5_cc_get_principal(context, ccache, &me);
1485 if (ret) {
1486 goto done;
1487 }
1488
1489 ret = smb_krb5_parse_name(context, server_s, &server);
1490 if (ret) {
1491 goto done;
1492 }
1493
1494 if (impersonate_princ_s) {
1495 ret = smb_krb5_parse_name(context, impersonate_princ_s,
1496 &impersonate_princ);
1497 if (ret) {
1498 goto done;
1499 }
1500 }
1501
1502 ret = smb_krb5_get_credentials(context, ccache,
1503 me, server, impersonate_princ,
1504 &creds);
1505 if (ret) {
1506 goto done;
1507 }
1508
1509 ret = krb5_cc_store_cred(context, ccache, creds);
1510 if (ret) {
1511 goto done;
1512 }
1513
1514 if (creds_p) {
1515 *creds_p = creds;
1516 }
1517
1518 DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
1519 server_s));
1520
1521 if (impersonate_princ_s) {
1522 char *client = NULL;
1523
1524 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
1525 if (ret) {
1526 goto done;
1527 }
1528 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
1529 client));
1530 TALLOC_FREE(client);
1531 }
1532
1533 done:
1534 if (!context) {
1535 return ret;
1536 }
1537
1538 if (creds && ret) {
1539 krb5_free_creds(context, creds);
1540 }
1541 if (server) {
1542 krb5_free_principal(context, server);
1543 }
1544 if (me) {
1545 krb5_free_principal(context, me);
1546 }
1547 if (impersonate_princ) {
1548 krb5_free_principal(context, impersonate_princ);
1549 }
1550 if (ccache) {
1551 krb5_cc_close(context, ccache);
1552 }
1553 krb5_free_context(context);
1554
1555 return ret;
1556 }
1557
1558
1559 krb5_error_code smb_krb5_keyblock_init_contents(krb5_context context,
1560 krb5_enctype enctype,
1561 const void *data,
1562 size_t length,
1563 krb5_keyblock *key)
1564 {
1565 #if defined(HAVE_KRB5_KEYBLOCK_INIT)
1566 return krb5_keyblock_init(context, enctype, data, length, key);
1567 #else
1568 memset(key, 0, sizeof(krb5_keyblock));
1569 KRB5_KEY_DATA(key) = SMB_MALLOC(length);
1570 if (NULL == KRB5_KEY_DATA(key)) {
1571 return ENOMEM;
1572 }
1573 memcpy(KRB5_KEY_DATA(key), data, length);
1574 KRB5_KEY_LENGTH(key) = length;
1575 KRB5_KEY_TYPE(key) = enctype;
1576 return 0;
1577 #endif
1578 }
1579
1580 /*
1581 simulate a kinit, putting the tgt in the given credentials cache.
1582 Orignally by remus@snapserver.com
1583
1584 This version is built to use a keyblock, rather than needing the
1585 original password.
1586
1587 The impersonate_principal is the principal if NULL, or the principal
1588 to impersonate
1589
1590 The target_service defaults to the krbtgt if NULL, but could be
1591 kpasswd/realm or the local service (if we are doing s4u2self)
1592 */
1593 krb5_error_code kerberos_kinit_keyblock_cc(krb5_context ctx, krb5_ccache cc,
1594 krb5_principal principal,
1595 krb5_keyblock *keyblock,
1596 const char *target_service,
1597 krb5_get_init_creds_opt *krb_options,
1598 time_t *expire_time,
1599 time_t *kdc_time)
1600 {
1601 krb5_error_code code = 0;
1602 krb5_creds my_creds;
1603
1604 #if defined(HAVE_KRB5_GET_INIT_CREDS_KEYBLOCK)
1605 code = krb5_get_init_creds_keyblock(ctx, &my_creds, principal,
1606 keyblock, 0, target_service,
1607 krb_options);
1608 #elif defined(HAVE_KRB5_GET_INIT_CREDS_KEYTAB)
1609 {
1610 #define SMB_CREDS_KEYTAB "MEMORY:tmp_smb_creds_XXXXXX"
1611 char tmp_name[sizeof(SMB_CREDS_KEYTAB)];
1612 krb5_keytab_entry entry;
1613 krb5_keytab keytab;
1614
1615 memset(&entry, 0, sizeof(entry));
1616 entry.principal = principal;
1617 *(KRB5_KT_KEY(&entry)) = *keyblock;
1618
1619 memcpy(tmp_name, SMB_CREDS_KEYTAB, sizeof(SMB_CREDS_KEYTAB));
1620 mktemp(tmp_name);
1621 if (tmp_name[0] == 0) {
1622 return KRB5_KT_BADNAME;
1623 }
1624 code = krb5_kt_resolve(ctx, tmp_name, &keytab);
1625 if (code) {
1626 return code;
1627 }
1628
1629 code = krb5_kt_add_entry(ctx, keytab, &entry);
1630 if (code) {
1631 (void)krb5_kt_close(ctx, keytab);
1632 goto done;
1633 }
1634
1635 code = krb5_get_init_creds_keytab(ctx, &my_creds, principal,
1636 keytab, 0, target_service,
1637 krb_options);
1638 (void)krb5_kt_close(ctx, keytab);
1639 }
1640 #else
1641 #error krb5_get_init_creds_keyblock not available!
1642 #endif
1643 if (code) {
1644 return code;
1645 }
1646
1647 code = krb5_cc_initialize(ctx, cc, principal);
1648 if (code) {
1649 goto done;
1650 }
1651
1652 code = krb5_cc_store_cred(ctx, cc, &my_creds);
1653 if (code) {
1654 goto done;
1655 }
1656
1657 if (expire_time) {
1658 *expire_time = (time_t) my_creds.times.endtime;
1659 }
1660
1661 if (kdc_time) {
1662 *kdc_time = (time_t) my_creds.times.starttime;
1663 }
1664
1665 code = 0;
1666 done:
1667 krb5_free_cred_contents(ctx, &my_creds);
1668 return code;
1669 }
1670
1671 krb5_error_code kerberos_kinit_password_cc(krb5_context ctx, krb5_ccache cc,
1672 krb5_principal principal,
1673 const char *password,
1674 const char *target_service,
1675 krb5_get_init_creds_opt *krb_options,
1676 time_t *expire_time,
1677 time_t *kdc_time)
1678 {
1679 krb5_error_code code = 0;
1680 krb5_creds my_creds;
1681
1682 code = krb5_get_init_creds_password(ctx, &my_creds, principal,
1683 password, NULL, NULL, 0,
1684 target_service, krb_options);
1685 if (code) {
1686 return code;
1687 }
1688
1689 code = krb5_cc_initialize(ctx, cc, principal);
1690 if (code) {
1691 goto done;
1692 }
1693
1694 code = krb5_cc_store_cred(ctx, cc, &my_creds);
1695 if (code) {
1696 goto done;
1697 }
1698
1699 if (expire_time) {
1700 *expire_time = (time_t) my_creds.times.endtime;
1701 }
1702
1703 if (kdc_time) {
1704 *kdc_time = (time_t) my_creds.times.starttime;
1705 }
1706
1707 code = 0;
1708 done:
1709 krb5_free_cred_contents(ctx, &my_creds);
1710 return code;
1711 }
1712
1713 #ifdef SAMBA4_USES_HEIMDAL
1714 /*
1715 simulate a kinit, putting the tgt in the given credentials cache.
1716 Orignally by remus@snapserver.com
1717
1718 The impersonate_principal is the principal
1719
1720 The self_service, should be the local service (for S4U2Self if
1721 impersonate_principal is given).
1722
1723 The target_service defaults to the krbtgt if NULL, but could be
1724 kpasswd/realm or a remote service (for S4U2Proxy)
1725
1726 */
1727 krb5_error_code kerberos_kinit_s4u2_cc(krb5_context ctx,
1728 krb5_ccache store_cc,
1729 krb5_principal init_principal,
1730 const char *init_password,
1731 krb5_principal impersonate_principal,
1732 const char *self_service,
1733 const char *target_service,
1734 krb5_get_init_creds_opt *krb_options,
1735 time_t *expire_time,
1736 time_t *kdc_time)
1737 {
1738 krb5_error_code code = 0;
1739 krb5_get_creds_opt options;
1740 krb5_principal store_principal;
1741 krb5_creds store_creds;
1742 krb5_creds *s4u2self_creds;
1743 Ticket s4u2self_ticket;
1744 size_t s4u2self_ticketlen;
1745 krb5_creds *s4u2proxy_creds;
1746 krb5_principal self_princ;
1747 bool s4u2proxy;
1748 krb5_principal target_princ;
1749 krb5_ccache tmp_cc;
1750 const char *self_realm;
1751 krb5_principal blacklist_principal = NULL;
1752 krb5_principal whitelist_principal = NULL;
1753
1754 code = krb5_get_init_creds_password(ctx, &store_creds,
1755 init_principal,
1756 init_password,
1757 NULL, NULL,
1758 0,
1759 NULL,
1760 krb_options);
1761 if (code != 0) {
1762 return code;
1763 }
1764
1765 store_principal = init_principal;
1766
1767 /*
1768 * We are trying S4U2Self now:
1769 *
1770 * As we do not want to expose our TGT in the
1771 * krb5_ccache, which is also holds the impersonated creds.
1772 *
1773 * Some low level krb5/gssapi function might use the TGT
1774 * identity and let the client act as our machine account.
1775 *
1776 * We need to avoid that and use a temporary krb5_ccache
1777 * in order to pass our TGT to the krb5_get_creds() function.
1778 */
1779 code = krb5_cc_new_unique(ctx, NULL, NULL, &tmp_cc);
1780 if (code != 0) {
1781 krb5_free_cred_contents(ctx, &store_creds);
1782 return code;
1783 }
1784
1785 code = krb5_cc_initialize(ctx, tmp_cc, store_creds.client);
1786 if (code != 0) {
1787 krb5_cc_destroy(ctx, tmp_cc);
1788 krb5_free_cred_contents(ctx, &store_creds);
1789 return code;
1790 }
1791
1792 code = krb5_cc_store_cred(ctx, tmp_cc, &store_creds);
1793 if (code != 0) {
1794 krb5_free_cred_contents(ctx, &store_creds);
1795 krb5_cc_destroy(ctx, tmp_cc);
1796 return code;
1797 }
1798
1799 /*
1800 * we need to remember the client principal of our
1801 * TGT and make sure the KDC does not return this
1802 * in the impersonated tickets. This can happen
1803 * if the KDC does not support S4U2Self and S4U2Proxy.
1804 */
1805 blacklist_principal = store_creds.client;
1806 store_creds.client = NULL;
1807 krb5_free_cred_contents(ctx, &store_creds);
1808
1809 /*
1810 * Check if we also need S4U2Proxy or if S4U2Self is
1811 * enough in order to get a ticket for the target.
1812 */
1813 if (target_service == NULL) {
1814 s4u2proxy = false;
1815 } else if (strcmp(target_service, self_service) == 0) {
1816 s4u2proxy = false;
1817 } else {
1818 s4u2proxy = true;
1819 }
1820
1821 /*
1822 * For S4U2Self we need our own service principal,
1823 * which belongs to our own realm (available on
1824 * our client principal).
1825 */
1826 self_realm = krb5_principal_get_realm(ctx, init_principal);
1827
1828 code = krb5_parse_name(ctx, self_service, &self_princ);
1829 if (code != 0) {
1830 krb5_free_principal(ctx, blacklist_principal);
1831 krb5_cc_destroy(ctx, tmp_cc);
1832 return code;
1833 }
1834
1835 code = krb5_principal_set_realm(ctx, self_princ, self_realm);
1836 if (code != 0) {
1837 krb5_free_principal(ctx, blacklist_principal);
1838 krb5_free_principal(ctx, self_princ);
1839 krb5_cc_destroy(ctx, tmp_cc);
1840 return code;
1841 }
1842
1843 code = krb5_get_creds_opt_alloc(ctx, &options);
1844 if (code != 0) {
1845 krb5_free_principal(ctx, blacklist_principal);
1846 krb5_free_principal(ctx, self_princ);
1847 krb5_cc_destroy(ctx, tmp_cc);
1848 return code;
1849 }
1850
1851 if (s4u2proxy) {
1852 /*
1853 * If we want S4U2Proxy, we need the forwardable flag
1854 * on the S4U2Self ticket.
1855 */
1856 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
1857 }
1858
1859 code = krb5_get_creds_opt_set_impersonate(ctx, options,
1860 impersonate_principal);
1861 if (code != 0) {
1862 krb5_get_creds_opt_free(ctx, options);
1863 krb5_free_principal(ctx, blacklist_principal);
1864 krb5_free_principal(ctx, self_princ);
1865 krb5_cc_destroy(ctx, tmp_cc);
1866 return code;
1867 }
1868
1869 code = krb5_get_creds(ctx, options, tmp_cc,
1870 self_princ, &s4u2self_creds);
1871 krb5_get_creds_opt_free(ctx, options);
1872 krb5_free_principal(ctx, self_princ);
1873 if (code != 0) {
1874 krb5_free_principal(ctx, blacklist_principal);
1875 krb5_cc_destroy(ctx, tmp_cc);
1876 return code;
1877 }
1878
1879 if (!s4u2proxy) {
1880 krb5_cc_destroy(ctx, tmp_cc);
1881
1882 /*
1883 * Now make sure we store the impersonated principal
1884 * and creds instead of the TGT related stuff
1885 * in the krb5_ccache of the caller.
1886 */
1887 code = krb5_copy_creds_contents(ctx, s4u2self_creds,
1888 &store_creds);
1889 krb5_free_creds(ctx, s4u2self_creds);
1890 if (code != 0) {
1891 return code;
1892 }
1893
1894 /*
1895 * It's important to store the principal the KDC
1896 * returned, as otherwise the caller would not find
1897 * the S4U2Self ticket in the krb5_ccache lookup.
1898 */
1899 store_principal = store_creds.client;
1900 goto store;
1901 }
1902
1903 /*
1904 * We are trying S4U2Proxy:
1905 *
1906 * We need the ticket from the S4U2Self step
1907 * and our TGT in order to get the delegated ticket.
1908 */
1909 code = decode_Ticket((const uint8_t *)s4u2self_creds->ticket.data,
1910 s4u2self_creds->ticket.length,
1911 &s4u2self_ticket,
1912 &s4u2self_ticketlen);
1913 if (code != 0) {
1914 krb5_free_creds(ctx, s4u2self_creds);
1915 krb5_free_principal(ctx, blacklist_principal);
1916 krb5_cc_destroy(ctx, tmp_cc);
1917 return code;
1918 }
1919
1920 /*
1921 * we need to remember the client principal of the
1922 * S4U2Self stage and as it needs to match the one we
1923 * will get for the S4U2Proxy stage. We need this
1924 * in order to detect KDCs which does not support S4U2Proxy.
1925 */
1926 whitelist_principal = s4u2self_creds->client;
1927 s4u2self_creds->client = NULL;
1928 krb5_free_creds(ctx, s4u2self_creds);
1929
1930 /*
1931 * For S4U2Proxy we also got a target service principal,
1932 * which also belongs to our own realm (available on
1933 * our client principal).
1934 */
1935 code = krb5_parse_name(ctx, target_service, &target_princ);
1936 if (code != 0) {
1937 free_Ticket(&s4u2self_ticket);
1938 krb5_free_principal(ctx, whitelist_principal);
1939 krb5_free_principal(ctx, blacklist_principal);
1940 krb5_cc_destroy(ctx, tmp_cc);
1941 return code;
1942 }
1943
1944 code = krb5_principal_set_realm(ctx, target_princ, self_realm);
1945 if (code != 0) {
1946 free_Ticket(&s4u2self_ticket);
1947 krb5_free_principal(ctx, target_princ);
1948 krb5_free_principal(ctx, whitelist_principal);
1949 krb5_free_principal(ctx, blacklist_principal);
1950 krb5_cc_destroy(ctx, tmp_cc);
1951 return code;
1952 }
1953
1954 code = krb5_get_creds_opt_alloc(ctx, &options);
1955 if (code != 0) {
1956 free_Ticket(&s4u2self_ticket);
1957 krb5_free_principal(ctx, target_princ);
1958 krb5_free_principal(ctx, whitelist_principal);
1959 krb5_free_principal(ctx, blacklist_principal);
1960 krb5_cc_destroy(ctx, tmp_cc);
1961 return code;
1962 }
1963
1964 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
1965 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_CONSTRAINED_DELEGATION);
1966
1967 code = krb5_get_creds_opt_set_ticket(ctx, options, &s4u2self_ticket);
1968 free_Ticket(&s4u2self_ticket);
1969 if (code != 0) {
1970 krb5_get_creds_opt_free(ctx, options);
1971 krb5_free_principal(ctx, target_princ);
1972 krb5_free_principal(ctx, whitelist_principal);
1973 krb5_free_principal(ctx, blacklist_principal);
1974 krb5_cc_destroy(ctx, tmp_cc);
1975 return code;
1976 }
1977
1978 code = krb5_get_creds(ctx, options, tmp_cc,
1979 target_princ, &s4u2proxy_creds);
1980 krb5_get_creds_opt_free(ctx, options);
1981 krb5_free_principal(ctx, target_princ);
1982 krb5_cc_destroy(ctx, tmp_cc);
1983 if (code != 0) {
1984 krb5_free_principal(ctx, whitelist_principal);
1985 krb5_free_principal(ctx, blacklist_principal);
1986 return code;
1987 }
1988
1989 /*
1990 * Now make sure we store the impersonated principal
1991 * and creds instead of the TGT related stuff
1992 * in the krb5_ccache of the caller.
1993 */
1994 code = krb5_copy_creds_contents(ctx, s4u2proxy_creds,
1995 &store_creds);
1996 krb5_free_creds(ctx, s4u2proxy_creds);
1997 if (code != 0) {
1998 krb5_free_principal(ctx, whitelist_principal);
1999 krb5_free_principal(ctx, blacklist_principal);
2000 return code;
2001 }
2002
2003 /*
2004 * It's important to store the principal the KDC
2005 * returned, as otherwise the caller would not find
2006 * the S4U2Self ticket in the krb5_ccache lookup.
2007 */
2008 store_principal = store_creds.client;
2009
2010 store:
2011 if (blacklist_principal &&
2012 krb5_principal_compare(ctx, store_creds.client, blacklist_principal)) {
2013 char *sp = NULL;
2014 char *ip = NULL;
2015
2016 code = krb5_unparse_name(ctx, blacklist_principal, &sp);
2017 if (code != 0) {
2018 sp = NULL;
2019 }
2020 code = krb5_unparse_name(ctx, impersonate_principal, &ip);
2021 if (code != 0) {
2022 ip = NULL;
2023 }
2024 DEBUG(1, ("kerberos_kinit_password_cc: "
2025 "KDC returned self principal[%s] while impersonating [%s]\n",
2026 sp?sp:"<no memory>",
2027 ip?ip:"<no memory>"));
2028
2029 SAFE_FREE(sp);
2030 SAFE_FREE(ip);
2031
2032 krb5_free_principal(ctx, whitelist_principal);
2033 krb5_free_principal(ctx, blacklist_principal);
2034 krb5_free_cred_contents(ctx, &store_creds);
2035 return KRB5_FWD_BAD_PRINCIPAL;
2036 }
2037 if (blacklist_principal) {
2038 krb5_free_principal(ctx, blacklist_principal);
2039 }
2040
2041 if (whitelist_principal &&
2042 !krb5_principal_compare(ctx, store_creds.client, whitelist_principal)) {
2043 char *sp = NULL;
2044 char *ep = NULL;
2045
2046 code = krb5_unparse_name(ctx, store_creds.client, &sp);
2047 if (code != 0) {
2048 sp = NULL;
2049 }
2050 code = krb5_unparse_name(ctx, whitelist_principal, &ep);
2051 if (code != 0) {
2052 ep = NULL;
2053 }
2054 DEBUG(1, ("kerberos_kinit_password_cc: "
2055 "KDC returned wrong principal[%s] we expected [%s]\n",
2056 sp?sp:"<no memory>",
2057 ep?ep:"<no memory>"));
2058
2059 SAFE_FREE(sp);
2060 SAFE_FREE(ep);
2061
2062 krb5_free_principal(ctx, whitelist_principal);
2063 krb5_free_cred_contents(ctx, &store_creds);
2064 return KRB5_FWD_BAD_PRINCIPAL;
2065 }
2066 if (whitelist_principal) {
2067 krb5_free_principal(ctx, whitelist_principal);
2068 }
2069
2070 code = krb5_cc_initialize(ctx, store_cc, store_principal);
2071 if (code != 0) {
2072 krb5_free_cred_contents(ctx, &store_creds);
2073 return code;
2074 }
2075
2076 code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
2077 if (code != 0) {
2078 krb5_free_cred_contents(ctx, &store_creds);
2079 return code;
2080 }
2081
2082 if (expire_time) {
2083 *expire_time = (time_t) store_creds.times.endtime;
2084 }
2085
2086 if (kdc_time) {
2087 *kdc_time = (time_t) store_creds.times.starttime;
2088 }
2089
2090 krb5_free_cred_contents(ctx, &store_creds);
2091
2092 return 0;
2093 }
2094 #endif
2095
2096 #if !defined(HAVE_KRB5_MAKE_PRINCIPAL) && defined(HAVE_KRB5_BUILD_PRINCIPAL_ALLOC_VA)
2097 krb5_error_code smb_krb5_make_principal(krb5_context context,
2098 krb5_principal *principal,
2099 const char *_realm, ...)
2100 {
2101 krb5_error_code code;
2102 bool free_realm;
2103 char *realm;
2104 va_list ap;
2105
2106 if (_realm) {
2107 realm = _realm;
2108 free_realm = false;
2109 } else {
2110 code = krb5_get_default_realm(context, &realm);
2111 if (code) {
2112 return code;
2113 }
2114 free_realm = true;
2115 }
2116
2117 va_start(ap, _realm);
2118 code = krb5_build_principal_alloc_va(context, principal,
2119 strlen(realm), realm,
2120 ap);
2121 va_end(ap);
2122
2123 if (free_realm) {
2124 krb5_free_default_realm(context, &realm);
2125 }
2126
2127 return code;
2128 }
2129 #endif
2130
2131 #if !defined(HAVE_KRB5_CC_GET_LIFETIME) && defined(HAVE_KRB5_CC_RETRIEVE_CRED)
2132 /**
2133 * @brief Get the lifetime of the initial ticket in the cache.
2134 *
2135 * @param[in] context The kerberos context.
2136 *
2137 * @param[in] id The credential cache to get the ticket lifetime.
2138 *
2139 * @param[out] t A pointer to a time value to store the lifetime.
2140 *
2141 * @return 0 on success, a krb5_error_code on error.
2142 */
2143 krb5_error_code smb_krb5_cc_get_lifetime(krb5_context context,
2144 krb5_ccache id,
2145 time_t *t)
2146 {
2147 krb5_error_code rc;
2148 krb5_creds mcreds;
2149 krb5_creds creds;
2150 krb5_timestamp now;
2151
2152 ZERO_STRUCT(mcreds);
2153
2154 mcreds.ticket_flags = TKT_FLG_INITIAL;
2155
2156 rc = krb5_cc_retrieve_cred(context,
2157 id,
2158 KRB5_TC_MATCH_FLAGS,
2159 &mcreds,
2160 &creds);
2161 if (rc != 0) {
2162 return rc;
2163 }
2164
2165 rc = krb5_timeofday(context, &now);
2166 if (rc != 0) {
2167 return rc;
2168 }
2169
2170 *t = (time_t) (creds.times.endtime - now);
2171
2172 krb5_free_creds(context, &creds);
2173
2174 return 0;
2175 }
2176 #endif /* HAVE_KRB5_CC_GET_LIFETIME */
2177
2178 #if !defined(HAVE_KRB5_FREE_CHECKSUM_CONTENTS) && defined(HAVE_FREE_CHECKSUM)
2179 void smb_krb5_free_checksum_contents(krb5_context ctx, krb5_checksum *cksum)
2180 {
2181 free_Checksum(cksum);
2182 }
2183 #endif
2184
2185 /*
2186 * smb_krb5_principal_get_realm
2187 *
2188 * @brief Get realm of a principal
2189 *
2190 * @param[in] context The krb5_context
2191 * @param[in] principal The principal
2192 * @return pointer to the realm
2193 *
2194 */
2195
2196 char *smb_krb5_principal_get_realm(krb5_context context,
2197 krb5_principal principal)
2198 {
2199 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2200 return discard_const_p(char, krb5_principal_get_realm(context, principal));
2201 #elif defined(krb5_princ_realm) /* MIT */
2202 krb5_data *realm;
2203 realm = krb5_princ_realm(context, principal);
2204 return discard_const_p(char, realm->data);
2205 #else
2206 return NULL;
2207 #endif
2208 }
2209
2210 /************************************************************************
2211 Routine to get the default realm from the kerberos credentials cache.
2212 Caller must free if the return value is not NULL.
2213 ************************************************************************/
2214
2215 static char *smb_krb5_get_default_realm_from_ccache(TALLOC_CTX *mem_ctx)
2216 {
2217 char *realm = NULL;
2218 krb5_context ctx = NULL;
2219 krb5_ccache cc = NULL;
2220 krb5_principal princ = NULL;
2221
2222 initialize_krb5_error_table();
2223 if (krb5_init_context(&ctx)) {
2224 return NULL;
2225 }
2226
2227 DEBUG(5,("kerberos_get_default_realm_from_ccache: "
2228 "Trying to read krb5 cache: %s\n",
2229 krb5_cc_default_name(ctx)));
2230 if (krb5_cc_default(ctx, &cc)) {
2231 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
2232 "failed to read default cache\n"));
2233 goto out;
2234 }
2235 if (krb5_cc_get_principal(ctx, cc, &princ)) {
2236 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
2237 "failed to get default principal\n"));
2238 goto out;
2239 }
2240
2241 #if defined(HAVE_KRB5_PRINCIPAL_GET_REALM)
2242 realm = talloc_strdup(mem_ctx, krb5_principal_get_realm(ctx, princ));
2243 #elif defined(HAVE_KRB5_PRINC_REALM)
2244 {
2245 krb5_data *realm_data = krb5_princ_realm(ctx, princ);
2246 realm = talloc_strndup(mem_ctx, realm_data->data, realm_data->length);
2247 }
2248 #endif
2249
2250 out:
2251
2252 if (ctx) {
2253 if (princ) {
2254 krb5_free_principal(ctx, princ);
2255 }
2256 if (cc) {
2257 krb5_cc_close(ctx, cc);
2258 }
2259 krb5_free_context(ctx);
2260 }
2261
2262 return realm;
2263 }
2264
2265 /************************************************************************
2266 Routine to get the realm from a given DNS name.
2267 ************************************************************************/
2268
2269 static char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
2270 const char *hostname)
2271 {
2272 #if defined(HAVE_KRB5_REALM_TYPE)
2273 /* Heimdal. */
2274 krb5_realm *realm_list = NULL;
2275 #else
2276 /* MIT */
2277 char **realm_list = NULL;
2278 #endif
2279 char *realm = NULL;
2280 krb5_error_code kerr;
2281 krb5_context ctx = NULL;
2282
2283 initialize_krb5_error_table();
2284 if (krb5_init_context(&ctx)) {
2285 return NULL;
2286 }
2287
2288 kerr = krb5_get_host_realm(ctx, hostname, &realm_list);
2289 if (kerr != 0) {
2290 DEBUG(3,("kerberos_get_realm_from_hostname %s: "
2291 "failed %s\n",
2292 hostname ? hostname : "(NULL)",
2293 error_message(kerr) ));
2294 goto out;
2295 }
2296
2297 if (realm_list && realm_list[0]) {
2298 realm = talloc_strdup(mem_ctx, realm_list[0]);
2299 }
2300
2301 out:
2302
2303 if (ctx) {
2304 if (realm_list) {
2305 krb5_free_host_realm(ctx, realm_list);
2306 realm_list = NULL;
2307 }
2308 krb5_free_context(ctx);
2309 ctx = NULL;
2310 }
2311 return realm;
2312 }
2313
2314 char *kerberos_get_principal_from_service_hostname(TALLOC_CTX *mem_ctx,
2315 const char *service,
2316 const char *remote_name,
2317 const char *default_realm)
2318 {
2319 char *realm = NULL;
2320 char *host = NULL;
2321 char *principal;
2322 host = strchr_m(remote_name, '.');
2323 if (host) {
2324 /* DNS name. */
2325 realm = smb_krb5_get_realm_from_hostname(talloc_tos(),
2326 remote_name);
2327 } else {
2328 /* NetBIOS name - use our realm. */
2329 realm = smb_krb5_get_default_realm_from_ccache(talloc_tos());
2330 }
2331
2332 if (realm == NULL || *realm == '\0') {
2333 realm = talloc_strdup(talloc_tos(), default_realm);
2334 if (!realm) {
2335 return NULL;
2336 }
2337 DEBUG(3,("kerberos_get_principal_from_service_hostname: "
2338 "cannot get realm from, "
2339 "desthost %s or default ccache. Using default "
2340 "smb.conf realm %s\n",
2341 remote_name,
2342 realm));
2343 }
2344
2345 principal = talloc_asprintf(mem_ctx,
2346 "%s/%s@%s",
2347 service, remote_name,
2348 realm);
2349 TALLOC_FREE(realm);
2350 return principal;
2351 }
2352
2353 char *smb_get_krb5_error_message(krb5_context context,
2354 krb5_error_code code,
2355 TALLOC_CTX *mem_ctx)
2356 {
2357 char *ret;
2358
2359 #if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
2360 const char *context_error = krb5_get_error_message(context, code);
2361 if (context_error) {
2362 ret = talloc_asprintf(mem_ctx, "%s: %s",
2363 error_message(code), context_error);
2364 krb5_free_error_message(context, context_error);
2365 return ret;
2366 }
2367 #endif
2368 ret = talloc_strdup(mem_ctx, error_message(code));
2369 return ret;
2370 }
2371
2372 #else /* HAVE_KRB5 */
2373 /* this saves a few linking headaches */
2374 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
2375 const char *principal, time_t time_offset,
2376 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
2377 uint32_t extra_ap_opts,
2378 const char *ccname, time_t *tgs_expire,
2379 const char *impersonate_princ_s)
2380 {
2381 DEBUG(0,("NO KERBEROS SUPPORT\n"));
2382 return 1;
2383 }
2384
2385 #endif /* HAVE_KRB5 */
stuff from bjacke