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torture: Remove a use of get_my_vnn()
[Samba.git] / lib / krb5_wrap / krb5_samba.c
blob3cb1ceebb8be2054627b5600636ba6fa6cf34e5d
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 "system/filesys.h"
25 #include "krb5_samba.h"
26 #include "lib/util/asn1.h"
27
28 #ifdef HAVE_COM_ERR_H
29 #include <com_err.h>
30 #endif /* HAVE_COM_ERR_H */
31
32 #ifndef KRB5_AUTHDATA_WIN2K_PAC
33 #define KRB5_AUTHDATA_WIN2K_PAC 128
34 #endif
35
36 #ifndef KRB5_AUTHDATA_IF_RELEVANT
37 #define KRB5_AUTHDATA_IF_RELEVANT 1
38 #endif
39
40 #ifdef HAVE_KRB5
41
42 #define GSSAPI_CHECKSUM 0x8003 /* Checksum type value for Kerberos */
43 #define GSSAPI_BNDLENGTH 16 /* Bind Length (rfc-1964 pg.3) */
44 #define GSSAPI_CHECKSUM_SIZE (4+GSSAPI_BNDLENGTH+4) /* Length of bind length,
45 bind field, flags field. */
46 #define GSS_C_DELEG_FLAG 1
47
48 /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
49 but still has the symbol */
50 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
51 krb5_error_code krb5_auth_con_set_req_cksumtype(
52 krb5_context context,
53 krb5_auth_context auth_context,
54 krb5_cksumtype cksumtype);
55 #endif
56
57 #if !defined(SMB_MALLOC)
58 #undef malloc
59 #define SMB_MALLOC(s) malloc((s))
60 #endif
61
62 #ifndef SMB_STRDUP
63 #define SMB_STRDUP(s) strdup(s)
64 #endif
65
66 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
67
68 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
69
70 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
71 * to krb5_set_default_tgs_ktypes. See
72 * http://lists.samba.org/archive/samba-technical/2006-July/048271.html
73 *
74 * If the MIT libraries are not exporting internal symbols, we will end up in
75 * this branch, which is correct. Otherwise we will continue to use the
76 * internal symbol
77 */
78 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
79 {
80 return krb5_set_default_tgs_enctypes(ctx, enc);
81 }
82
83 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
84
85 /* Heimdal */
86 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
87 {
88 return krb5_set_default_in_tkt_etypes(ctx, enc);
89 }
90
91 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
92
93 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
94
95 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
96 /* HEIMDAL */
97 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
98 {
99 memset(pkaddr, '\0', sizeof(krb5_address));
100 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
101 if (paddr->ss_family == AF_INET6) {
102 pkaddr->addr_type = KRB5_ADDRESS_INET6;
103 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
104 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
105 return true;
106 }
107 #endif
108 if (paddr->ss_family == AF_INET) {
109 pkaddr->addr_type = KRB5_ADDRESS_INET;
110 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
111 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
112 return true;
113 }
114 return false;
115 }
116 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
117 /* MIT */
118 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
119 {
120 memset(pkaddr, '\0', sizeof(krb5_address));
121 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
122 if (paddr->ss_family == AF_INET6) {
123 pkaddr->addrtype = ADDRTYPE_INET6;
124 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
125 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
126 return true;
127 }
128 #endif
129 if (paddr->ss_family == AF_INET) {
130 pkaddr->addrtype = ADDRTYPE_INET;
131 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
132 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
133 return true;
134 }
135 return false;
136 }
137 #else
138 #error UNKNOWN_ADDRTYPE
139 #endif
140
141 /**
142 * @brief Create a keyblock based on input parameters
143 *
144 * @param context The krb5_context
145 * @param host_princ The krb5_principal to use
146 * @param salt The optional salt, if omitted, salt is calculated with
147 * the provided principal.
148 * @param password The krb5_data containing the password
149 * @param enctype The krb5_enctype to use for the keyblock generation
150 * @param key The returned krb5_keyblock, caller needs to free with
151 * krb5_free_keyblock().
152 *
153 * @return krb5_error_code
154 */
155 int smb_krb5_create_key_from_string(krb5_context context,
156 krb5_const_principal host_princ,
157 krb5_data *salt,
158 krb5_data *password,
159 krb5_enctype enctype,
160 krb5_keyblock *key)
161 {
162 int ret = 0;
163
164 if (host_princ == NULL && salt == NULL) {
165 return -1;
166 }
167
168 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_C_STRING_TO_KEY)
169 {/* MIT */
170 krb5_data _salt;
171
172 if (salt == NULL) {
173 ret = krb5_principal2salt(context, host_princ, &_salt);
174 if (ret) {
175 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
176 return ret;
177 }
178 } else {
179 _salt = *salt;
180 }
181 ret = krb5_c_string_to_key(context, enctype, password, &_salt, key);
182 if (salt == NULL) {
183 SAFE_FREE(_salt.data);
184 }
185 }
186 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
187 {/* Heimdal */
188 krb5_salt _salt;
189
190 if (salt == NULL) {
191 ret = krb5_get_pw_salt(context, host_princ, &_salt);
192 if (ret) {
193 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
194 return ret;
195 }
196 } else {
197 _salt.saltvalue = *salt;
198 _salt.salttype = KRB5_PW_SALT;
199 }
200
201 ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, _salt, key);
202 if (salt == NULL) {
203 krb5_free_salt(context, _salt);
204 }
205 }
206 #else
207 #error UNKNOWN_CREATE_KEY_FUNCTIONS
208 #endif
209 return ret;
210 }
211
212 /**
213 * @brief Create a salt for a given principal
214 *
215 * @param context The initialized krb5_context
216 * @param host_princ The krb5_principal to create the salt for
217 * @param psalt A pointer to a krb5_data struct
218 *
219 * caller has to free the contents of psalt with kerberos_free_data_contents
220 * when function has succeeded
221 *
222 * @return krb5_error_code, returns 0 on success, error code otherwise
223 */
224
225 int smb_krb5_get_pw_salt(krb5_context context,
226 krb5_const_principal host_princ,
227 krb5_data *psalt)
228 #if defined(HAVE_KRB5_GET_PW_SALT)
229 /* Heimdal */
230 {
231 int ret;
232 krb5_salt salt;
233
234 ret = krb5_get_pw_salt(context, host_princ, &salt);
235 if (ret) {
236 return ret;
237 }
238
239 psalt->data = salt.saltvalue.data;
240 psalt->length = salt.saltvalue.length;
241
242 return ret;
243 }
244 #elif defined(HAVE_KRB5_PRINCIPAL2SALT)
245 /* MIT */
246 {
247 return krb5_principal2salt(context, host_princ, psalt);
248 }
249 #else
250 #error UNKNOWN_SALT_FUNCTIONS
251 #endif
252
253 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
254 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
255 krb5_enctype **enctypes)
256 {
257 return krb5_get_permitted_enctypes(context, enctypes);
258 }
259 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
260 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
261 krb5_enctype **enctypes)
262 {
263 #ifdef HAVE_KRB5_PDU_NONE_DECL
264 return krb5_get_default_in_tkt_etypes(context, KRB5_PDU_NONE, enctypes);
265 #else
266 return krb5_get_default_in_tkt_etypes(context, enctypes);
267 #endif
268 }
269 #else
270 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
271 #endif
272
273 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
274 krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
275 krb5_auth_context auth_context,
276 krb5_keyblock *keyblock)
277 {
278 return krb5_auth_con_setkey(context, auth_context, keyblock);
279 }
280 #endif
281
282 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
283 DATA_BLOB *edata,
284 DATA_BLOB *edata_out)
285 {
286 DATA_BLOB edata_contents;
287 ASN1_DATA *data;
288 int edata_type;
289
290 if (!edata->length) {
291 return false;
292 }
293
294 data = asn1_init(mem_ctx);
295 if (data == NULL) {
296 return false;
297 }
298
299 if (!asn1_load(data, *edata)) goto err;
300 if (!asn1_start_tag(data, ASN1_SEQUENCE(0))) goto err;
301 if (!asn1_start_tag(data, ASN1_CONTEXT(1))) goto err;
302 if (!asn1_read_Integer(data, &edata_type)) goto err;
303
304 if (edata_type != KRB5_PADATA_PW_SALT) {
305 DEBUG(0,("edata is not of required type %d but of type %d\n",
306 KRB5_PADATA_PW_SALT, edata_type));
307 goto err;
308 }
309
310 if (!asn1_start_tag(data, ASN1_CONTEXT(2))) goto err;
311 if (!asn1_read_OctetString(data, talloc_tos(), &edata_contents)) goto err;
312 if (!asn1_end_tag(data)) goto err;
313 if (!asn1_end_tag(data)) goto err;
314 if (!asn1_end_tag(data)) goto err;
315 asn1_free(data);
316
317 *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
318
319 data_blob_free(&edata_contents);
320
321 return true;
322
323 err:
324
325 asn1_free(data);
326 return false;
327 }
328
329
330 static bool ads_cleanup_expired_creds(krb5_context context,
331 krb5_ccache ccache,
332 krb5_creds *credsp)
333 {
334 krb5_error_code retval;
335 const char *cc_type = krb5_cc_get_type(context, ccache);
336
337 DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
338 cc_type, krb5_cc_get_name(context, ccache),
339 http_timestring(talloc_tos(), credsp->times.endtime)));
340
341 /* we will probably need new tickets if the current ones
342 will expire within 10 seconds.
343 */
344 if (credsp->times.endtime >= (time(NULL) + 10))
345 return false;
346
347 /* heimdal won't remove creds from a file ccache, and
348 perhaps we shouldn't anyway, since internally we
349 use memory ccaches, and a FILE one probably means that
350 we're using creds obtained outside of our exectuable
351 */
352 if (strequal(cc_type, "FILE")) {
353 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
354 return false;
355 }
356
357 retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
358 if (retval) {
359 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
360 error_message(retval)));
361 /* If we have an error in this, we want to display it,
362 but continue as though we deleted it */
363 }
364 return true;
365 }
366
367 /* Allocate and setup the auth context into the state we need. */
368
369 static krb5_error_code setup_auth_context(krb5_context context,
370 krb5_auth_context *auth_context)
371 {
372 krb5_error_code retval;
373
374 retval = krb5_auth_con_init(context, auth_context );
375 if (retval) {
376 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
377 error_message(retval)));
378 return retval;
379 }
380
381 /* Ensure this is an addressless ticket. */
382 retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
383 if (retval) {
384 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
385 error_message(retval)));
386 }
387
388 return retval;
389 }
390
391 #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)
392 static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
393 uint32_t gss_flags)
394 {
395 unsigned int orig_length = in_data->length;
396 unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
397 char *gss_cksum = NULL;
398
399 if (orig_length) {
400 /* Extra length field for delgated ticket. */
401 base_cksum_size += 4;
402 }
403
404 if ((unsigned int)base_cksum_size + orig_length <
405 (unsigned int)base_cksum_size) {
406 return EINVAL;
407 }
408
409 gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
410 if (gss_cksum == NULL) {
411 return ENOMEM;
412 }
413
414 memset(gss_cksum, '\0', base_cksum_size + orig_length);
415 SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
416
417 /*
418 * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
419 * This matches the behavior of heimdal and mit.
420 *
421 * And it is needed to work against some closed source
422 * SMB servers.
423 *
424 * See bug #7883
425 */
426 memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
427
428 SIVAL(gss_cksum, 20, gss_flags);
429
430 if (orig_length) {
431 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
432 SSVAL(gss_cksum, 26, orig_length);
433 /* Copy the kerberos KRB_CRED data */
434 memcpy(gss_cksum + 28, in_data->data, orig_length);
435 free(in_data->data);
436 in_data->data = NULL;
437 in_data->length = 0;
438 }
439 in_data->data = gss_cksum;
440 in_data->length = base_cksum_size + orig_length;
441 return 0;
442 }
443 #endif
444
445 /**************************************************************
446 krb5_parse_name that takes a UNIX charset.
447 **************************************************************/
448
449 krb5_error_code smb_krb5_parse_name(krb5_context context,
450 const char *name, /* in unix charset */
451 krb5_principal *principal)
452 {
453 krb5_error_code ret;
454 char *utf8_name;
455 size_t converted_size;
456 TALLOC_CTX *frame = talloc_stackframe();
457
458 if (!push_utf8_talloc(frame, &utf8_name, name, &converted_size)) {
459 talloc_free(frame);
460 return ENOMEM;
461 }
462
463 ret = krb5_parse_name(context, utf8_name, principal);
464 TALLOC_FREE(frame);
465 return ret;
466 }
467
468 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
469 void krb5_free_unparsed_name(krb5_context context, char *val)
470 {
471 SAFE_FREE(val);
472 }
473 #endif
474
475 /**************************************************************
476 krb5_parse_name that returns a UNIX charset name. Must
477 be freed with talloc_free() call.
478 **************************************************************/
479
480 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
481 krb5_context context,
482 krb5_const_principal principal,
483 char **unix_name)
484 {
485 krb5_error_code ret;
486 char *utf8_name;
487 size_t converted_size;
488
489 *unix_name = NULL;
490 ret = krb5_unparse_name(context, principal, &utf8_name);
491 if (ret) {
492 return ret;
493 }
494
495 if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
496 krb5_free_unparsed_name(context, utf8_name);
497 return ENOMEM;
498 }
499 krb5_free_unparsed_name(context, utf8_name);
500 return 0;
501 }
502
503 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
504 const char *name,
505 krb5_principal *principal)
506 {
507 /* we are cheating here because parse_name will in fact set the realm.
508 * We don't care as the only caller of smb_krb5_parse_name_norealm
509 * ignores the realm anyway when calling
510 * smb_krb5_principal_compare_any_realm later - Guenther */
511
512 return smb_krb5_parse_name(context, name, principal);
513 }
514
515 bool smb_krb5_principal_compare_any_realm(krb5_context context,
516 krb5_const_principal princ1,
517 krb5_const_principal princ2)
518 {
519 return krb5_principal_compare_any_realm(context, princ1, princ2);
520 }
521
522 /*
523 we can't use krb5_mk_req because w2k wants the service to be in a particular format
524 */
525 static krb5_error_code ads_krb5_mk_req(krb5_context context,
526 krb5_auth_context *auth_context,
527 const krb5_flags ap_req_options,
528 const char *principal,
529 krb5_ccache ccache,
530 krb5_data *outbuf,
531 time_t *expire_time,
532 const char *impersonate_princ_s)
533 {
534 krb5_error_code retval;
535 krb5_principal server;
536 krb5_principal impersonate_princ = NULL;
537 krb5_creds * credsp;
538 krb5_creds creds;
539 krb5_data in_data;
540 bool creds_ready = false;
541 int i = 0, maxtries = 3;
542
543 ZERO_STRUCT(in_data);
544
545 retval = smb_krb5_parse_name(context, principal, &server);
546 if (retval) {
547 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
548 return retval;
549 }
550
551 if (impersonate_princ_s) {
552 retval = smb_krb5_parse_name(context, impersonate_princ_s,
553 &impersonate_princ);
554 if (retval) {
555 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
556 goto cleanup_princ;
557 }
558 }
559
560 /* obtain ticket & session key */
561 ZERO_STRUCT(creds);
562 if ((retval = krb5_copy_principal(context, server, &creds.server))) {
563 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
564 error_message(retval)));
565 goto cleanup_princ;
566 }
567
568 if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
569 /* This can commonly fail on smbd startup with no ticket in the cache.
570 * Report at higher level than 1. */
571 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
572 error_message(retval)));
573 goto cleanup_creds;
574 }
575
576 while (!creds_ready && (i < maxtries)) {
577
578 if ((retval = smb_krb5_get_credentials(context, ccache,
579 creds.client,
580 creds.server,
581 impersonate_princ,
582 &credsp))) {
583 DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
584 principal, error_message(retval)));
585 goto cleanup_creds;
586 }
587
588 /* cope with ticket being in the future due to clock skew */
589 if ((unsigned)credsp->times.starttime > time(NULL)) {
590 time_t t = time(NULL);
591 int time_offset =(int)((unsigned)credsp->times.starttime-t);
592 DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
593 krb5_set_real_time(context, t + time_offset + 1, 0);
594 }
595
596 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
597 creds_ready = true;
598 }
599
600 i++;
601 }
602
603 DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
604 principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
605 http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
606 (unsigned)credsp->times.endtime));
607
608 if (expire_time) {
609 *expire_time = (time_t)credsp->times.endtime;
610 }
611
612 /* Allocate the auth_context. */
613 retval = setup_auth_context(context, auth_context);
614 if (retval) {
615 DEBUG(1,("setup_auth_context failed (%s)\n",
616 error_message(retval)));
617 goto cleanup_creds;
618 }
619
620 #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)
621 {
622 uint32_t gss_flags = 0;
623
624 if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
625 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
626 as part of the kerberos exchange. */
627
628 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n") );
629
630 retval = krb5_auth_con_setuseruserkey(context,
631 *auth_context,
632 &credsp->keyblock );
633 if (retval) {
634 DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
635 error_message(retval)));
636 goto cleanup_creds;
637 }
638
639 /* Must use a subkey for forwarded tickets. */
640 retval = krb5_auth_con_setflags(context,
641 *auth_context,
642 KRB5_AUTH_CONTEXT_USE_SUBKEY);
643 if (retval) {
644 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
645 error_message(retval)));
646 goto cleanup_creds;
647 }
648
649 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
650 *auth_context, /* Authentication context [in] */
651 discard_const_p(char, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
652 credsp->client, /* Client principal for the tgt [in] */
653 credsp->server, /* Server principal for the tgt [in] */
654 ccache, /* Credential cache to use for storage [in] */
655 1, /* Turn on for "Forwardable ticket" [in] */
656 &in_data ); /* Resulting response [out] */
657
658 if (retval) {
659 DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
660 error_message( retval ) ) );
661
662 /*
663 * This is not fatal. Delete the *auth_context and continue
664 * with krb5_mk_req_extended to get a non-forwardable ticket.
665 */
666
667 if (in_data.data) {
668 free( in_data.data );
669 in_data.data = NULL;
670 in_data.length = 0;
671 }
672 krb5_auth_con_free(context, *auth_context);
673 *auth_context = NULL;
674 retval = setup_auth_context(context, auth_context);
675 if (retval) {
676 DEBUG(1,("setup_auth_context failed (%s)\n",
677 error_message(retval)));
678 goto cleanup_creds;
679 }
680 } else {
681 /* We got a delegated ticket. */
682 gss_flags |= GSS_C_DELEG_FLAG;
683 }
684 }
685
686 /* Frees and reallocates in_data into a GSS checksum blob. */
687 retval = create_gss_checksum(&in_data, gss_flags);
688 if (retval) {
689 goto cleanup_data;
690 }
691
692 /* We always want GSS-checksum types. */
693 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
694 if (retval) {
695 DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
696 error_message(retval)));
697 goto cleanup_data;
698 }
699 }
700 #endif
701
702 retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
703 &in_data, credsp, outbuf);
704 if (retval) {
705 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
706 error_message(retval)));
707 }
708
709 #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)
710 cleanup_data:
711 #endif
712
713 if (in_data.data) {
714 free( in_data.data );
715 in_data.length = 0;
716 }
717
718 krb5_free_creds(context, credsp);
719
720 cleanup_creds:
721 krb5_free_cred_contents(context, &creds);
722
723 cleanup_princ:
724 krb5_free_principal(context, server);
725 if (impersonate_princ) {
726 krb5_free_principal(context, impersonate_princ);
727 }
728
729 return retval;
730 }
731
732 void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
733 {
734 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
735 if (pdata->data) {
736 krb5_free_data_contents(context, pdata);
737 }
738 #elif defined(HAVE_KRB5_DATA_FREE)
739 krb5_data_free(context, pdata);
740 #else
741 SAFE_FREE(pdata->data);
742 #endif
743 }
744
745 /*
746 * @brief copy a buffer into a krb5_data struct
747 *
748 * @param[in] p The krb5_data
749 * @param[in] data The data to copy
750 * @param[in] length The length of the data to copy
751 * @return krb5_error_code
752 *
753 * Caller has to free krb5_data with kerberos_free_data_contents().
754 */
755
756 krb5_error_code krb5_copy_data_contents(krb5_data *p,
757 const void *data,
758 size_t len)
759 {
760 #if defined(HAVE_KRB5_DATA_COPY)
761 return krb5_data_copy(p, data, len);
762 #else
763 if (len) {
764 p->data = malloc(len);
765 if (p->data == NULL) {
766 return ENOMEM;
767 }
768 memmove(p->data, data, len);
769 } else {
770 p->data = NULL;
771 }
772 p->length = len;
773 p->magic = KV5M_DATA;
774 return 0;
775 #endif
776 }
777
778 /*
779 get a kerberos5 ticket for the given service
780 */
781 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
782 const char *principal, time_t time_offset,
783 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
784 uint32_t extra_ap_opts, const char *ccname,
785 time_t *tgs_expire,
786 const char *impersonate_princ_s)
787
788 {
789 krb5_error_code retval;
790 krb5_data packet;
791 krb5_context context = NULL;
792 krb5_ccache ccdef = NULL;
793 krb5_auth_context auth_context = NULL;
794 krb5_enctype enc_types[] = {
795 #ifdef HAVE_ENCTYPE_AES256_CTS_HMAC_SHA1_96
796 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
797 #endif
798 #ifdef HAVE_ENCTYPE_AES128_CTS_HMAC_SHA1_96
799 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
800 #endif
801 ENCTYPE_ARCFOUR_HMAC,
802 ENCTYPE_DES_CBC_MD5,
803 ENCTYPE_DES_CBC_CRC,
804 ENCTYPE_NULL};
805
806 initialize_krb5_error_table();
807 retval = krb5_init_context(&context);
808 if (retval) {
809 DEBUG(1, ("krb5_init_context failed (%s)\n",
810 error_message(retval)));
811 goto failed;
812 }
813
814 if (time_offset != 0) {
815 krb5_set_real_time(context, time(NULL) + time_offset, 0);
816 }
817
818 if ((retval = krb5_cc_resolve(context, ccname ?
819 ccname : krb5_cc_default_name(context), &ccdef))) {
820 DEBUG(1, ("krb5_cc_default failed (%s)\n",
821 error_message(retval)));
822 goto failed;
823 }
824
825 if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
826 DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
827 error_message(retval)));
828 goto failed;
829 }
830
831 retval = ads_krb5_mk_req(context, &auth_context,
832 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
833 principal, ccdef, &packet,
834 tgs_expire, impersonate_princ_s);
835 if (retval) {
836 goto failed;
837 }
838
839 get_krb5_smb_session_key(mem_ctx, context, auth_context,
840 session_key_krb5, false);
841
842 *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
843
844 kerberos_free_data_contents(context, &packet);
845
846 failed:
847
848 if (context) {
849 if (ccdef)
850 krb5_cc_close(context, ccdef);
851 if (auth_context)
852 krb5_auth_con_free(context, auth_context);
853 krb5_free_context(context);
854 }
855
856 return retval;
857 }
858
859 bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
860 krb5_context context,
861 krb5_auth_context auth_context,
862 DATA_BLOB *session_key, bool remote)
863 {
864 krb5_keyblock *skey = NULL;
865 krb5_error_code err = 0;
866 bool ret = false;
867
868 if (remote) {
869 #ifdef HAVE_KRB5_AUTH_CON_GETRECVSUBKEY
870 err = krb5_auth_con_getrecvsubkey(context,
871 auth_context,
872 &skey);
873 #else /* HAVE_KRB5_AUTH_CON_GETRECVSUBKEY */
874 err = krb5_auth_con_getremotesubkey(context,
875 auth_context, &skey);
876 #endif /* HAVE_KRB5_AUTH_CON_GETRECVSUBKEY */
877 } else {
878 #ifdef HAVE_KRB5_AUTH_CON_GETSENDSUBKEY
879 err = krb5_auth_con_getsendsubkey(context,
880 auth_context,
881 &skey);
882 #else /* HAVE_KRB5_AUTH_CON_GETSENDSUBKEY */
883 err = krb5_auth_con_getlocalsubkey(context,
884 auth_context, &skey);
885 #endif /* HAVE_KRB5_AUTH_CON_GETSENDSUBKEY */
886 }
887
888 if (err || skey == NULL) {
889 DEBUG(10, ("KRB5 error getting session key %d\n", err));
890 goto done;
891 }
892
893 DEBUG(10, ("Got KRB5 session key of length %d\n",
894 (int)KRB5_KEY_LENGTH(skey)));
895
896 *session_key = data_blob_talloc(mem_ctx,
897 KRB5_KEY_DATA(skey),
898 KRB5_KEY_LENGTH(skey));
899 dump_data_pw("KRB5 Session Key:\n",
900 session_key->data,
901 session_key->length);
902
903 ret = true;
904
905 done:
906 if (skey) {
907 krb5_free_keyblock(context, skey);
908 }
909
910 return ret;
911 }
912
913
914 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
915 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
916
917 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
918 {
919 static krb5_data kdata;
920
921 kdata.data = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i));
922 kdata.length = strlen((const char *)kdata.data);
923 return &kdata;
924 }
925 #endif
926
927 /*
928 * @brief Get talloced string component of a principal
929 *
930 * @param[in] mem_ctx The TALLOC_CTX
931 * @param[in] context The krb5_context
932 * @param[in] principal The principal
933 * @param[in] component The component
934 * @return string component
935 *
936 * Caller must talloc_free if the return value is not NULL.
937 *
938 */
939
940 /* caller has to free returned string with talloc_free() */
941 char *smb_krb5_principal_get_comp_string(TALLOC_CTX *mem_ctx,
942 krb5_context context,
943 krb5_const_principal principal,
944 unsigned int component)
945 {
946 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING)
947 return talloc_strdup(mem_ctx, krb5_principal_get_comp_string(context, principal, component));
948 #else
949 krb5_data *data;
950
951 if (component >= krb5_princ_size(context, principal)) {
952 return NULL;
953 }
954
955 data = krb5_princ_component(context, principal, component);
956 if (data == NULL) {
957 return NULL;
958 }
959
960 return talloc_strndup(mem_ctx, data->data, data->length);
961 #endif
962 }
963
964 /* Prototypes */
965
966 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, /* FILE:/tmp/krb5cc_0 */
967 const char *client_string, /* gd@BER.SUSE.DE */
968 const char *service_string, /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
969 time_t *expire_time)
970 {
971 krb5_error_code ret;
972 krb5_context context = NULL;
973 krb5_ccache ccache = NULL;
974 krb5_principal client = NULL;
975 krb5_creds creds, creds_in;
976
977 ZERO_STRUCT(creds);
978 ZERO_STRUCT(creds_in);
979
980 initialize_krb5_error_table();
981 ret = krb5_init_context(&context);
982 if (ret) {
983 goto done;
984 }
985
986 if (!ccache_string) {
987 ccache_string = krb5_cc_default_name(context);
988 }
989
990 if (!ccache_string) {
991 ret = EINVAL;
992 goto done;
993 }
994
995 DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
996
997 /* FIXME: we should not fall back to defaults */
998 ret = krb5_cc_resolve(context, discard_const_p(char, ccache_string), &ccache);
999 if (ret) {
1000 goto done;
1001 }
1002
1003 if (client_string) {
1004 ret = smb_krb5_parse_name(context, client_string, &client);
1005 if (ret) {
1006 goto done;
1007 }
1008 } else {
1009 ret = krb5_cc_get_principal(context, ccache, &client);
1010 if (ret) {
1011 goto done;
1012 }
1013 }
1014
1015 ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string));
1016 if (ret) {
1017 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1018 goto done;
1019 }
1020
1021 /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1022 ret = krb5_cc_initialize(context, ccache, client);
1023 if (ret) {
1024 goto done;
1025 }
1026
1027 ret = krb5_cc_store_cred(context, ccache, &creds);
1028
1029 if (expire_time) {
1030 *expire_time = (time_t) creds.times.endtime;
1031 }
1032
1033 done:
1034 krb5_free_cred_contents(context, &creds_in);
1035 krb5_free_cred_contents(context, &creds);
1036
1037 if (client) {
1038 krb5_free_principal(context, client);
1039 }
1040 if (ccache) {
1041 krb5_cc_close(context, ccache);
1042 }
1043 if (context) {
1044 krb5_free_context(context);
1045 }
1046
1047 return ret;
1048 }
1049
1050 krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1051 {
1052 krb5_error_code ret = 0;
1053 if (addr == NULL) {
1054 return ret;
1055 }
1056 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1057 krb5_free_addresses(context, addr->addrs);
1058 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1059 ret = krb5_free_addresses(context, addr->addrs);
1060 SAFE_FREE(addr->addrs);
1061 #endif
1062 SAFE_FREE(addr);
1063 addr = NULL;
1064 return ret;
1065 }
1066
1067 #define MAX_NETBIOSNAME_LEN 16
1068 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr,
1069 const char *netbios_name)
1070 {
1071 krb5_error_code ret = 0;
1072 char buf[MAX_NETBIOSNAME_LEN];
1073 int len;
1074 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1075 krb5_address **addrs = NULL;
1076 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1077 krb5_addresses *addrs = NULL;
1078 #endif
1079
1080 *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1081 if (*kerb_addr == NULL) {
1082 return ENOMEM;
1083 }
1084
1085 /* temporarily duplicate put_name() code here to avoid dependency
1086 * issues for a 5 lines function */
1087 len = strlen(netbios_name);
1088 memcpy(buf, netbios_name,
1089 (len < MAX_NETBIOSNAME_LEN) ? len : MAX_NETBIOSNAME_LEN - 1);
1090 if (len < MAX_NETBIOSNAME_LEN - 1) {
1091 memset(buf + len, ' ', MAX_NETBIOSNAME_LEN - 1 - len);
1092 }
1093 buf[MAX_NETBIOSNAME_LEN - 1] = 0x20;
1094
1095 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1096 {
1097 int num_addr = 2;
1098
1099 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1100 if (addrs == NULL) {
1101 SAFE_FREE(*kerb_addr);
1102 return ENOMEM;
1103 }
1104
1105 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1106
1107 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1108 if (addrs[0] == NULL) {
1109 SAFE_FREE(addrs);
1110 SAFE_FREE(*kerb_addr);
1111 return ENOMEM;
1112 }
1113
1114 addrs[0]->magic = KV5M_ADDRESS;
1115 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1116 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1117 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1118 if (addrs[0]->contents == NULL) {
1119 SAFE_FREE(addrs[0]);
1120 SAFE_FREE(addrs);
1121 SAFE_FREE(*kerb_addr);
1122 return ENOMEM;
1123 }
1124
1125 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1126
1127 addrs[1] = NULL;
1128 }
1129 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1130 {
1131 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1132 if (addrs == NULL) {
1133 SAFE_FREE(*kerb_addr);
1134 return ENOMEM;
1135 }
1136
1137 memset(addrs, 0, sizeof(krb5_addresses));
1138
1139 addrs->len = 1;
1140 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1141 if (addrs->val == NULL) {
1142 SAFE_FREE(addrs);
1143 SAFE_FREE(kerb_addr);
1144 return ENOMEM;
1145 }
1146
1147 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1148 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1149 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1150 if (addrs->val[0].address.data == NULL) {
1151 SAFE_FREE(addrs->val);
1152 SAFE_FREE(addrs);
1153 SAFE_FREE(*kerb_addr);
1154 return ENOMEM;
1155 }
1156
1157 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1158 }
1159 #else
1160 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1161 #endif
1162 (*kerb_addr)->addrs = addrs;
1163
1164 return ret;
1165 }
1166
1167 void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1168 {
1169 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1170 krb5_free_error_contents(context, krberror);
1171 #else /* MIT */
1172 krb5_free_error(context, krberror);
1173 #endif
1174 }
1175
1176 krb5_error_code handle_krberror_packet(krb5_context context,
1177 krb5_data *packet)
1178 {
1179 krb5_error_code ret;
1180 bool got_error_code = false;
1181
1182 DEBUG(10,("handle_krberror_packet: got error packet\n"));
1183
1184 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1185 {
1186 krb5_error krberror;
1187
1188 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1189 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1190 error_message(ret)));
1191 return ret;
1192 }
1193
1194 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1195 ret = (krb5_error_code) krberror.error_code;
1196 got_error_code = true;
1197 }
1198
1199 smb_krb5_free_error(context, &krberror);
1200 }
1201 #else /* MIT */
1202 {
1203 krb5_error *krberror;
1204
1205 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1206 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1207 error_message(ret)));
1208 return ret;
1209 }
1210
1211 if (krberror->e_data.data == NULL) {
1212 #if defined(ERROR_TABLE_BASE_krb5)
1213 ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1214 #else
1215 ret = (krb5_error_code)krberror->error;
1216 #endif
1217 got_error_code = true;
1218 }
1219 smb_krb5_free_error(context, krberror);
1220 }
1221 #endif
1222 if (got_error_code) {
1223 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1224 error_message(ret), ret));
1225 }
1226 return ret;
1227 }
1228
1229 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1230 krb5_get_init_creds_opt **opt)
1231 {
1232 /* Heimdal or modern MIT version */
1233 return krb5_get_init_creds_opt_alloc(context, opt);
1234 }
1235
1236 void smb_krb5_get_init_creds_opt_free(krb5_context context,
1237 krb5_get_init_creds_opt *opt)
1238 {
1239 /* Modern MIT or Heimdal version */
1240 krb5_get_init_creds_opt_free(context, opt);
1241 }
1242
1243 krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1244 {
1245 return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1246 }
1247
1248 krb5_error_code smb_krb5_kt_free_entry(krb5_context context,
1249 krb5_keytab_entry *kt_entry)
1250 {
1251 /* Try krb5_free_keytab_entry_contents first, since
1252 * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
1253 * krb5_kt_free_entry but only has a prototype for the first, while the
1254 * second is considered private.
1255 */
1256 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
1257 return krb5_free_keytab_entry_contents(context, kt_entry);
1258 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
1259 return krb5_kt_free_entry(context, kt_entry);
1260 #else
1261 #error UNKNOWN_KT_FREE_FUNCTION
1262 #endif
1263 }
1264
1265
1266 /* caller needs to free etype_s */
1267 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1268 krb5_enctype enctype,
1269 char **etype_s)
1270 {
1271 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1272 return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1273 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1274 char buf[256];
1275 krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1276 if (ret) {
1277 return ret;
1278 }
1279 *etype_s = SMB_STRDUP(buf);
1280 if (!*etype_s) {
1281 return ENOMEM;
1282 }
1283 return ret;
1284 #else
1285 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1286 #endif
1287 }
1288
1289 /**********************************************************************
1290 * Open a krb5 keytab with flags, handles readonly or readwrite access and
1291 * allows one to process non-default keytab names.
1292 * @param context krb5_context
1293 * @param keytab_name_req string
1294 * @param write_access bool if writable keytab is required
1295 * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1296 * @return krb5_error_code
1297 **********************************************************************/
1298
1299 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1300 #ifndef MAX_KEYTAB_NAME_LEN
1301 #define MAX_KEYTAB_NAME_LEN 1100
1302 #endif
1303
1304 krb5_error_code smb_krb5_open_keytab_relative(krb5_context context,
1305 const char *keytab_name_req,
1306 bool write_access,
1307 krb5_keytab *keytab)
1308 {
1309 krb5_error_code ret = 0;
1310 TALLOC_CTX *mem_ctx;
1311 char keytab_string[MAX_KEYTAB_NAME_LEN];
1312 char *kt_str = NULL;
1313 bool found_valid_name = false;
1314 const char *pragma = "FILE";
1315 const char *tmp = NULL;
1316
1317 if (!write_access && !keytab_name_req) {
1318 /* caller just wants to read the default keytab readonly, so be it */
1319 return krb5_kt_default(context, keytab);
1320 }
1321
1322 mem_ctx = talloc_init("smb_krb5_open_keytab");
1323 if (!mem_ctx) {
1324 return ENOMEM;
1325 }
1326
1327 #ifdef HAVE_WRFILE_KEYTAB
1328 if (write_access) {
1329 pragma = "WRFILE";
1330 }
1331 #endif
1332
1333 if (keytab_name_req) {
1334
1335 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1336 ret = KRB5_CONFIG_NOTENUFSPACE;
1337 goto out;
1338 }
1339
1340 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1341 (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1342 tmp = keytab_name_req;
1343 goto resolve;
1344 }
1345
1346 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1347 if (!tmp) {
1348 ret = ENOMEM;
1349 goto out;
1350 }
1351
1352 goto resolve;
1353 }
1354
1355 /* we need to handle more complex keytab_strings, like:
1356 * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1357
1358 ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1359 if (ret) {
1360 goto out;
1361 }
1362
1363 DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1364
1365 tmp = talloc_strdup(mem_ctx, keytab_string);
1366 if (!tmp) {
1367 ret = ENOMEM;
1368 goto out;
1369 }
1370
1371 if (strncmp(tmp, "ANY:", 4) == 0) {
1372 tmp += 4;
1373 }
1374
1375 memset(&keytab_string, '\0', sizeof(keytab_string));
1376
1377 while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1378 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1379 found_valid_name = true;
1380 tmp = kt_str;
1381 tmp += 7;
1382 }
1383
1384 if (strncmp(kt_str, "FILE:", 5) == 0) {
1385 found_valid_name = true;
1386 tmp = kt_str;
1387 tmp += 5;
1388 }
1389
1390 if (tmp[0] == '/') {
1391 /* Treat as a FILE: keytab definition. */
1392 found_valid_name = true;
1393 }
1394
1395 if (found_valid_name) {
1396 if (tmp[0] != '/') {
1397 ret = KRB5_KT_BADNAME;
1398 goto out;
1399 }
1400
1401 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1402 if (!tmp) {
1403 ret = ENOMEM;
1404 goto out;
1405 }
1406 break;
1407 }
1408 }
1409
1410 if (!found_valid_name) {
1411 ret = KRB5_KT_UNKNOWN_TYPE;
1412 goto out;
1413 }
1414
1415 resolve:
1416 DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1417 ret = krb5_kt_resolve(context, tmp, keytab);
1418
1419 out:
1420 TALLOC_FREE(mem_ctx);
1421 return ret;
1422 }
1423
1424 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1425 const char *keytab_name_req,
1426 bool write_access,
1427 krb5_keytab *keytab)
1428 {
1429 if (keytab_name_req != NULL) {
1430 if (keytab_name_req[0] != '/') {
1431 return KRB5_KT_BADNAME;
1432 }
1433 }
1434
1435 return smb_krb5_open_keytab_relative(context,
1436 keytab_name_req,
1437 write_access,
1438 keytab);
1439 }
1440
1441 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1442 krb5_context context,
1443 krb5_keytab keytab,
1444 const char **keytab_name)
1445 {
1446 char keytab_string[MAX_KEYTAB_NAME_LEN];
1447 krb5_error_code ret = 0;
1448
1449 ret = krb5_kt_get_name(context, keytab,
1450 keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1451 if (ret) {
1452 return ret;
1453 }
1454
1455 *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1456 if (!*keytab_name) {
1457 return ENOMEM;
1458 }
1459
1460 return ret;
1461 }
1462
1463 /**
1464 * @brief Seek and delete old entries in a keytab based on the passed
1465 * principal.
1466 *
1467 * @param[in] context The KRB5 context to use.
1468 *
1469 * @param[in] keytab The keytab to operate on.
1470 *
1471 * @param[in] kvno The kvnco to use.
1472 *
1473 * @param[in] princ_s The principal as a string to search for.
1474 *
1475 * @param[in] princ The principal as a krb5_principal to search for.
1476 *
1477 * @param[in] flush Weather to flush the complete keytab.
1478 *
1479 * @param[in] keep_old_entries Keep the entry with the previous kvno.
1480 *
1481 * @retval 0 on Sucess
1482 *
1483 * @return An appropriate KRB5 error code.
1484 */
1485 krb5_error_code smb_krb5_kt_seek_and_delete_old_entries(krb5_context context,
1486 krb5_keytab keytab,
1487 krb5_kvno kvno,
1488 krb5_enctype enctype,
1489 const char *princ_s,
1490 krb5_principal princ,
1491 bool flush,
1492 bool keep_old_entries)
1493 {
1494 krb5_error_code ret;
1495 krb5_kt_cursor cursor;
1496 krb5_kt_cursor zero_csr;
1497 krb5_keytab_entry kt_entry;
1498 krb5_keytab_entry zero_kt_entry;
1499 char *ktprinc = NULL;
1500 krb5_kvno old_kvno = kvno - 1;
1501 TALLOC_CTX *tmp_ctx;
1502
1503 ZERO_STRUCT(cursor);
1504 ZERO_STRUCT(zero_csr);
1505 ZERO_STRUCT(kt_entry);
1506 ZERO_STRUCT(zero_kt_entry);
1507
1508 ret = krb5_kt_start_seq_get(context, keytab, &cursor);
1509 if (ret == KRB5_KT_END || ret == ENOENT ) {
1510 /* no entries */
1511 return 0;
1512 }
1513
1514 tmp_ctx = talloc_new(NULL);
1515 if (tmp_ctx == NULL) {
1516 return ENOMEM;
1517 }
1518
1519 DEBUG(3, (__location__ ": Will try to delete old keytab entries\n"));
1520 while (!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) {
1521 bool name_ok = false;
1522 krb5_enctype kt_entry_enctype =
1523 smb_get_enctype_from_kt_entry(&kt_entry);
1524
1525 if (!flush && (princ_s != NULL)) {
1526 ret = smb_krb5_unparse_name(tmp_ctx, context,
1527 kt_entry.principal,
1528 &ktprinc);
1529 if (ret) {
1530 DEBUG(1, (__location__
1531 ": smb_krb5_unparse_name failed "
1532 "(%s)\n", error_message(ret)));
1533 goto out;
1534 }
1535
1536 #ifdef HAVE_KRB5_KT_COMPARE
1537 name_ok = krb5_kt_compare(context, &kt_entry,
1538 princ, 0, 0);
1539 #else
1540 name_ok = (strcmp(ktprinc, princ_s) == 0);
1541 #endif
1542
1543 if (!name_ok) {
1544 DEBUG(10, (__location__ ": ignoring keytab "
1545 "entry principal %s, kvno = %d\n",
1546 ktprinc, kt_entry.vno));
1547
1548 /* Not a match,
1549 * just free this entry and continue. */
1550 ret = smb_krb5_kt_free_entry(context,
1551 &kt_entry);
1552 ZERO_STRUCT(kt_entry);
1553 if (ret) {
1554 DEBUG(1, (__location__
1555 ": smb_krb5_kt_free_entry "
1556 "failed (%s)\n",
1557 error_message(ret)));
1558 goto out;
1559 }
1560
1561 TALLOC_FREE(ktprinc);
1562 continue;
1563 }
1564
1565 TALLOC_FREE(ktprinc);
1566 }
1567
1568 /*------------------------------------------------------------
1569 * Save the entries with kvno - 1. This is what microsoft does
1570 * to allow people with existing sessions that have kvno - 1
1571 * to still work. Otherwise, when the password for the machine
1572 * changes, all kerberizied sessions will 'break' until either
1573 * the client reboots or the client's session key expires and
1574 * they get a new session ticket with the new kvno.
1575 * Some keytab files only store the kvno in 8bits, limit
1576 * the compare accordingly.
1577 */
1578
1579 if (!flush && ((kt_entry.vno & 0xff) == (old_kvno & 0xff))) {
1580 DEBUG(5, (__location__ ": Saving previous (kvno %d) "
1581 "entry for principal: %s.\n",
1582 old_kvno, princ_s));
1583 continue;
1584 }
1585
1586 if (keep_old_entries) {
1587 DEBUG(5, (__location__ ": Saving old (kvno %d) "
1588 "entry for principal: %s.\n",
1589 kvno, princ_s));
1590 continue;
1591 }
1592
1593 if (!flush &&
1594 (kt_entry.vno == kvno) &&
1595 (kt_entry_enctype != enctype))
1596 {
1597 DEBUG(5, (__location__ ": Saving entry with kvno [%d] "
1598 "enctype [%d] for principal: %s.\n",
1599 kvno, kt_entry_enctype, princ_s));
1600 continue;
1601 }
1602
1603 DEBUG(5, (__location__ ": Found old entry for principal: %s "
1604 "(kvno %d) - trying to remove it.\n",
1605 princ_s, kt_entry.vno));
1606
1607 ret = krb5_kt_end_seq_get(context, keytab, &cursor);
1608 ZERO_STRUCT(cursor);
1609 if (ret) {
1610 DEBUG(1, (__location__ ": krb5_kt_end_seq_get() "
1611 "failed (%s)\n", error_message(ret)));
1612 goto out;
1613 }
1614 ret = krb5_kt_remove_entry(context, keytab, &kt_entry);
1615 if (ret) {
1616 DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
1617 "failed (%s)\n", error_message(ret)));
1618 goto out;
1619 }
1620
1621 DEBUG(5, (__location__ ": removed old entry for principal: "
1622 "%s (kvno %d).\n", princ_s, kt_entry.vno));
1623
1624 ret = krb5_kt_start_seq_get(context, keytab, &cursor);
1625 if (ret) {
1626 DEBUG(1, (__location__ ": krb5_kt_start_seq() failed "
1627 "(%s)\n", error_message(ret)));
1628 goto out;
1629 }
1630 ret = smb_krb5_kt_free_entry(context, &kt_entry);
1631 ZERO_STRUCT(kt_entry);
1632 if (ret) {
1633 DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
1634 "failed (%s)\n", error_message(ret)));
1635 goto out;
1636 }
1637 }
1638
1639 out:
1640 talloc_free(tmp_ctx);
1641 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
1642 smb_krb5_kt_free_entry(context, &kt_entry);
1643 }
1644 if (memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) {
1645 krb5_kt_end_seq_get(context, keytab, &cursor);
1646 }
1647 return ret;
1648 }
1649
1650 /**
1651 * @brief Add a keytab entry for the given principal
1652 *
1653 * @param[in] context The krb5 context to use.
1654 *
1655 * @param[in] keytab The keytab to add the entry to.
1656 *
1657 * @param[in] kvno The kvno to use.
1658 *
1659 * @param[in] princ_s The principal as a string.
1660 *
1661 * @param[in] salt_principal The salt principal to salt the password with.
1662 * Only needed for keys which support salting.
1663 * If no salt is used set no_salt to false and
1664 * pass NULL here.
1665 *
1666 * @param[in] enctype The encryption type of the keytab entry.
1667 *
1668 * @param[in] password The password of the keytab entry.
1669 *
1670 * @param[in] no_salt If the password should not be salted. Normally
1671 * this is only set to false for encryption types
1672 * which do not support salting like RC4.
1673 *
1674 * @param[in] keep_old_entries Wether to keep or delte old keytab entries.
1675 *
1676 * @retval 0 on Success
1677 *
1678 * @return A corresponding KRB5 error code.
1679 *
1680 * @see smb_krb5_open_keytab()
1681 */
1682 krb5_error_code smb_krb5_kt_add_entry(krb5_context context,
1683 krb5_keytab keytab,
1684 krb5_kvno kvno,
1685 const char *princ_s,
1686 const char *salt_principal,
1687 krb5_enctype enctype,
1688 krb5_data *password,
1689 bool no_salt,
1690 bool keep_old_entries)
1691 {
1692 krb5_error_code ret;
1693 krb5_keytab_entry kt_entry;
1694 krb5_principal princ = NULL;
1695 krb5_keyblock *keyp;
1696
1697 ZERO_STRUCT(kt_entry);
1698
1699 ret = smb_krb5_parse_name(context, princ_s, &princ);
1700 if (ret) {
1701 DEBUG(1, (__location__ ": smb_krb5_parse_name(%s) "
1702 "failed (%s)\n", princ_s, error_message(ret)));
1703 goto out;
1704 }
1705
1706 /* Seek and delete old keytab entries */
1707 ret = smb_krb5_kt_seek_and_delete_old_entries(context,
1708 keytab,
1709 kvno,
1710 enctype,
1711 princ_s,
1712 princ,
1713 false,
1714 keep_old_entries);
1715 if (ret) {
1716 goto out;
1717 }
1718
1719 /* If we get here, we have deleted all the old entries with kvno's
1720 * not equal to the current kvno-1. */
1721
1722 keyp = KRB5_KT_KEY(&kt_entry);
1723
1724 if (no_salt) {
1725 KRB5_KEY_DATA(keyp) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
1726 if (KRB5_KEY_DATA(keyp) == NULL) {
1727 ret = ENOMEM;
1728 goto out;
1729 }
1730 memcpy(KRB5_KEY_DATA(keyp), password->data, password->length);
1731 KRB5_KEY_LENGTH(keyp) = password->length;
1732 KRB5_KEY_TYPE(keyp) = enctype;
1733 } else {
1734 krb5_principal salt_princ = NULL;
1735
1736 /* Now add keytab entries for all encryption types */
1737 ret = smb_krb5_parse_name(context, salt_principal, &salt_princ);
1738 if (ret) {
1739 DBG_WARNING("krb5_parse_name(%s) failed (%s)\n",
1740 salt_principal, error_message(ret));
1741 goto out;
1742 }
1743
1744 ret = smb_krb5_create_key_from_string(context,
1745 salt_princ,
1746 NULL,
1747 password,
1748 enctype,
1749 keyp);
1750 krb5_free_principal(context, salt_princ);
1751 if (ret != 0) {
1752 goto out;
1753 }
1754 }
1755
1756 kt_entry.principal = princ;
1757 kt_entry.vno = kvno;
1758
1759 DEBUG(3, (__location__ ": adding keytab entry for (%s) with "
1760 "encryption type (%d) and version (%d)\n",
1761 princ_s, enctype, kt_entry.vno));
1762 ret = krb5_kt_add_entry(context, keytab, &kt_entry);
1763 krb5_free_keyblock_contents(context, keyp);
1764 ZERO_STRUCT(kt_entry);
1765 if (ret) {
1766 DEBUG(1, (__location__ ": adding entry to keytab "
1767 "failed (%s)\n", error_message(ret)));
1768 goto out;
1769 }
1770
1771 out:
1772 if (princ) {
1773 krb5_free_principal(context, princ);
1774 }
1775
1776 return ret;
1777 }
1778
1779 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1780 defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1781 defined(HAVE_KRB5_GET_CREDS)
1782 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1783 krb5_ccache ccache,
1784 krb5_principal me,
1785 krb5_principal server,
1786 krb5_principal impersonate_princ,
1787 krb5_creds **out_creds)
1788 {
1789 krb5_error_code ret;
1790 krb5_get_creds_opt opt;
1791
1792 ret = krb5_get_creds_opt_alloc(context, &opt);
1793 if (ret) {
1794 goto done;
1795 }
1796 krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1797
1798 if (impersonate_princ) {
1799 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1800 impersonate_princ);
1801 if (ret) {
1802 goto done;
1803 }
1804 }
1805
1806 ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1807 if (ret) {
1808 goto done;
1809 }
1810
1811 done:
1812 if (opt) {
1813 krb5_get_creds_opt_free(context, opt);
1814 }
1815 return ret;
1816 }
1817 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1818
1819 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1820
1821 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1822 krb5_error_code KRB5_CALLCONV
1823 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1824 krb5_ccache ccache, krb5_creds *in_creds,
1825 krb5_data *subject_cert,
1826 krb5_creds **out_creds);
1827 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1828
1829 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1830 krb5_ccache ccache,
1831 krb5_principal me,
1832 krb5_principal server,
1833 krb5_principal impersonate_princ,
1834 krb5_creds **out_creds)
1835 {
1836 krb5_error_code ret;
1837 krb5_creds in_creds;
1838
1839 ZERO_STRUCT(in_creds);
1840
1841 if (impersonate_princ) {
1842
1843 in_creds.server = me;
1844 in_creds.client = impersonate_princ;
1845
1846 ret = krb5_get_credentials_for_user(context,
1847 0, /* krb5_flags options */
1848 ccache,
1849 &in_creds,
1850 NULL, /* krb5_data *subject_cert */
1851 out_creds);
1852 } else {
1853 in_creds.client = me;
1854 in_creds.server = server;
1855
1856 ret = krb5_get_credentials(context, 0, ccache,
1857 &in_creds, out_creds);
1858 }
1859
1860 return ret;
1861 }
1862 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1863
1864 /*
1865 * smb_krb5_get_credentials
1866 *
1867 * @brief Get krb5 credentials for a server
1868 *
1869 * @param[in] context An initialized krb5_context
1870 * @param[in] ccache An initialized krb5_ccache
1871 * @param[in] me The krb5_principal of the caller
1872 * @param[in] server The krb5_principal of the requested service
1873 * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1874 * @param[out] out_creds The returned krb5_creds structure
1875 * @return krb5_error_code
1876 *
1877 */
1878 krb5_error_code smb_krb5_get_credentials(krb5_context context,
1879 krb5_ccache ccache,
1880 krb5_principal me,
1881 krb5_principal server,
1882 krb5_principal impersonate_princ,
1883 krb5_creds **out_creds)
1884 {
1885 krb5_error_code ret;
1886 krb5_creds *creds = NULL;
1887
1888 if (out_creds != NULL) {
1889 *out_creds = NULL;
1890 }
1891
1892 if (impersonate_princ) {
1893 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
1894 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
1895 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
1896 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
1897 #else
1898 ret = ENOTSUP;
1899 #endif
1900 } else {
1901 krb5_creds in_creds;
1902
1903 ZERO_STRUCT(in_creds);
1904
1905 in_creds.client = me;
1906 in_creds.server = server;
1907
1908 ret = krb5_get_credentials(context, 0, ccache,
1909 &in_creds, &creds);
1910 }
1911 if (ret) {
1912 goto done;
1913 }
1914
1915 if (out_creds) {
1916 *out_creds = creds;
1917 }
1918
1919 done:
1920 if (creds && ret) {
1921 krb5_free_creds(context, creds);
1922 }
1923
1924 return ret;
1925 }
1926
1927 krb5_error_code smb_krb5_keyblock_init_contents(krb5_context context,
1928 krb5_enctype enctype,
1929 const void *data,
1930 size_t length,
1931 krb5_keyblock *key)
1932 {
1933 #if defined(HAVE_KRB5_KEYBLOCK_INIT)
1934 return krb5_keyblock_init(context, enctype, data, length, key);
1935 #else
1936 memset(key, 0, sizeof(krb5_keyblock));
1937 KRB5_KEY_DATA(key) = SMB_MALLOC(length);
1938 if (NULL == KRB5_KEY_DATA(key)) {
1939 return ENOMEM;
1940 }
1941 memcpy(KRB5_KEY_DATA(key), data, length);
1942 KRB5_KEY_LENGTH(key) = length;
1943 KRB5_KEY_TYPE(key) = enctype;
1944 return 0;
1945 #endif
1946 }
1947
1948 /*
1949 simulate a kinit, putting the tgt in the given credentials cache.
1950 Orignally by remus@snapserver.com
1951
1952 This version is built to use a keyblock, rather than needing the
1953 original password.
1954
1955 The impersonate_principal is the principal if NULL, or the principal
1956 to impersonate
1957
1958 The target_service defaults to the krbtgt if NULL, but could be
1959 kpasswd/realm or the local service (if we are doing s4u2self)
1960 */
1961 krb5_error_code kerberos_kinit_keyblock_cc(krb5_context ctx, krb5_ccache cc,
1962 krb5_principal principal,
1963 krb5_keyblock *keyblock,
1964 const char *target_service,
1965 krb5_get_init_creds_opt *krb_options,
1966 time_t *expire_time,
1967 time_t *kdc_time)
1968 {
1969 krb5_error_code code = 0;
1970 krb5_creds my_creds;
1971
1972 #if defined(HAVE_KRB5_GET_INIT_CREDS_KEYBLOCK)
1973 code = krb5_get_init_creds_keyblock(ctx, &my_creds, principal,
1974 keyblock, 0, target_service,
1975 krb_options);
1976 #elif defined(HAVE_KRB5_GET_INIT_CREDS_KEYTAB)
1977 {
1978 #define SMB_CREDS_KEYTAB "MEMORY:tmp_smb_creds_XXXXXX"
1979 char tmp_name[sizeof(SMB_CREDS_KEYTAB)];
1980 krb5_keytab_entry entry;
1981 krb5_keytab keytab;
1982 mode_t mask;
1983
1984 memset(&entry, 0, sizeof(entry));
1985 entry.principal = principal;
1986 *(KRB5_KT_KEY(&entry)) = *keyblock;
1987
1988 memcpy(tmp_name, SMB_CREDS_KEYTAB, sizeof(SMB_CREDS_KEYTAB));
1989 mask = umask(S_IRWXO | S_IRWXG);
1990 mktemp(tmp_name);
1991 umask(mask);
1992 if (tmp_name[0] == 0) {
1993 return KRB5_KT_BADNAME;
1994 }
1995 code = krb5_kt_resolve(ctx, tmp_name, &keytab);
1996 if (code) {
1997 return code;
1998 }
1999
2000 code = krb5_kt_add_entry(ctx, keytab, &entry);
2001 if (code) {
2002 (void)krb5_kt_close(ctx, keytab);
2003 goto done;
2004 }
2005
2006 code = krb5_get_init_creds_keytab(ctx, &my_creds, principal,
2007 keytab, 0, target_service,
2008 krb_options);
2009 (void)krb5_kt_close(ctx, keytab);
2010 }
2011 #else
2012 #error krb5_get_init_creds_keyblock not available!
2013 #endif
2014 if (code) {
2015 return code;
2016 }
2017
2018 #ifndef SAMBA4_USES_HEIMDAL /* MIT */
2019 /*
2020 * We need to store the principal as returned from the KDC to the
2021 * credentials cache. If we don't do that the KRB5 library is not
2022 * able to find the tickets it is looking for
2023 */
2024 principal = my_creds.client;
2025 #endif
2026 code = krb5_cc_initialize(ctx, cc, principal);
2027 if (code) {
2028 goto done;
2029 }
2030
2031 code = krb5_cc_store_cred(ctx, cc, &my_creds);
2032 if (code) {
2033 goto done;
2034 }
2035
2036 if (expire_time) {
2037 *expire_time = (time_t) my_creds.times.endtime;
2038 }
2039
2040 if (kdc_time) {
2041 *kdc_time = (time_t) my_creds.times.starttime;
2042 }
2043
2044 code = 0;
2045 done:
2046 krb5_free_cred_contents(ctx, &my_creds);
2047 return code;
2048 }
2049
2050 krb5_error_code kerberos_kinit_password_cc(krb5_context ctx, krb5_ccache cc,
2051 krb5_principal principal,
2052 const char *password,
2053 const char *target_service,
2054 krb5_get_init_creds_opt *krb_options,
2055 time_t *expire_time,
2056 time_t *kdc_time)
2057 {
2058 krb5_error_code code = 0;
2059 krb5_creds my_creds;
2060
2061 code = krb5_get_init_creds_password(ctx, &my_creds, principal,
2062 password, NULL, NULL, 0,
2063 target_service, krb_options);
2064 if (code) {
2065 return code;
2066 }
2067
2068 #ifndef SAMBA4_USES_HEIMDAL /* MIT */
2069 /*
2070 * We need to store the principal as returned from the KDC to the
2071 * credentials cache. If we don't do that the KRB5 library is not
2072 * able to find the tickets it is looking for
2073 */
2074 principal = my_creds.client;
2075 #endif
2076 code = krb5_cc_initialize(ctx, cc, principal);
2077 if (code) {
2078 goto done;
2079 }
2080
2081 code = krb5_cc_store_cred(ctx, cc, &my_creds);
2082 if (code) {
2083 goto done;
2084 }
2085
2086 if (expire_time) {
2087 *expire_time = (time_t) my_creds.times.endtime;
2088 }
2089
2090 if (kdc_time) {
2091 *kdc_time = (time_t) my_creds.times.starttime;
2092 }
2093
2094 code = 0;
2095 done:
2096 krb5_free_cred_contents(ctx, &my_creds);
2097 return code;
2098 }
2099
2100 #ifdef SAMBA4_USES_HEIMDAL
2101 /*
2102 simulate a kinit, putting the tgt in the given credentials cache.
2103 Orignally by remus@snapserver.com
2104
2105 The impersonate_principal is the principal
2106
2107 The self_service, should be the local service (for S4U2Self if
2108 impersonate_principal is given).
2109
2110 The target_service defaults to the krbtgt if NULL, but could be
2111 kpasswd/realm or a remote service (for S4U2Proxy)
2112
2113 */
2114 krb5_error_code kerberos_kinit_s4u2_cc(krb5_context ctx,
2115 krb5_ccache store_cc,
2116 krb5_principal init_principal,
2117 const char *init_password,
2118 krb5_principal impersonate_principal,
2119 const char *self_service,
2120 const char *target_service,
2121 krb5_get_init_creds_opt *krb_options,
2122 time_t *expire_time,
2123 time_t *kdc_time)
2124 {
2125 krb5_error_code code = 0;
2126 krb5_get_creds_opt options;
2127 krb5_principal store_principal;
2128 krb5_creds store_creds;
2129 krb5_creds *s4u2self_creds;
2130 Ticket s4u2self_ticket;
2131 size_t s4u2self_ticketlen;
2132 krb5_creds *s4u2proxy_creds;
2133 krb5_principal self_princ;
2134 bool s4u2proxy;
2135 krb5_principal target_princ;
2136 krb5_ccache tmp_cc;
2137 const char *self_realm;
2138 krb5_principal blacklist_principal = NULL;
2139 krb5_principal whitelist_principal = NULL;
2140
2141 code = krb5_get_init_creds_password(ctx, &store_creds,
2142 init_principal,
2143 init_password,
2144 NULL, NULL,
2145 0,
2146 NULL,
2147 krb_options);
2148 if (code != 0) {
2149 return code;
2150 }
2151
2152 store_principal = init_principal;
2153
2154 /*
2155 * We are trying S4U2Self now:
2156 *
2157 * As we do not want to expose our TGT in the
2158 * krb5_ccache, which is also holds the impersonated creds.
2159 *
2160 * Some low level krb5/gssapi function might use the TGT
2161 * identity and let the client act as our machine account.
2162 *
2163 * We need to avoid that and use a temporary krb5_ccache
2164 * in order to pass our TGT to the krb5_get_creds() function.
2165 */
2166 code = krb5_cc_new_unique(ctx, NULL, NULL, &tmp_cc);
2167 if (code != 0) {
2168 krb5_free_cred_contents(ctx, &store_creds);
2169 return code;
2170 }
2171
2172 code = krb5_cc_initialize(ctx, tmp_cc, store_creds.client);
2173 if (code != 0) {
2174 krb5_cc_destroy(ctx, tmp_cc);
2175 krb5_free_cred_contents(ctx, &store_creds);
2176 return code;
2177 }
2178
2179 code = krb5_cc_store_cred(ctx, tmp_cc, &store_creds);
2180 if (code != 0) {
2181 krb5_free_cred_contents(ctx, &store_creds);
2182 krb5_cc_destroy(ctx, tmp_cc);
2183 return code;
2184 }
2185
2186 /*
2187 * we need to remember the client principal of our
2188 * TGT and make sure the KDC does not return this
2189 * in the impersonated tickets. This can happen
2190 * if the KDC does not support S4U2Self and S4U2Proxy.
2191 */
2192 blacklist_principal = store_creds.client;
2193 store_creds.client = NULL;
2194 krb5_free_cred_contents(ctx, &store_creds);
2195
2196 /*
2197 * Check if we also need S4U2Proxy or if S4U2Self is
2198 * enough in order to get a ticket for the target.
2199 */
2200 if (target_service == NULL) {
2201 s4u2proxy = false;
2202 } else if (strcmp(target_service, self_service) == 0) {
2203 s4u2proxy = false;
2204 } else {
2205 s4u2proxy = true;
2206 }
2207
2208 /*
2209 * For S4U2Self we need our own service principal,
2210 * which belongs to our own realm (available on
2211 * our client principal).
2212 */
2213 self_realm = krb5_principal_get_realm(ctx, init_principal);
2214
2215 code = krb5_parse_name(ctx, self_service, &self_princ);
2216 if (code != 0) {
2217 krb5_free_principal(ctx, blacklist_principal);
2218 krb5_cc_destroy(ctx, tmp_cc);
2219 return code;
2220 }
2221
2222 code = krb5_principal_set_realm(ctx, self_princ, self_realm);
2223 if (code != 0) {
2224 krb5_free_principal(ctx, blacklist_principal);
2225 krb5_free_principal(ctx, self_princ);
2226 krb5_cc_destroy(ctx, tmp_cc);
2227 return code;
2228 }
2229
2230 code = krb5_get_creds_opt_alloc(ctx, &options);
2231 if (code != 0) {
2232 krb5_free_principal(ctx, blacklist_principal);
2233 krb5_free_principal(ctx, self_princ);
2234 krb5_cc_destroy(ctx, tmp_cc);
2235 return code;
2236 }
2237
2238 if (s4u2proxy) {
2239 /*
2240 * If we want S4U2Proxy, we need the forwardable flag
2241 * on the S4U2Self ticket.
2242 */
2243 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
2244 }
2245
2246 code = krb5_get_creds_opt_set_impersonate(ctx, options,
2247 impersonate_principal);
2248 if (code != 0) {
2249 krb5_get_creds_opt_free(ctx, options);
2250 krb5_free_principal(ctx, blacklist_principal);
2251 krb5_free_principal(ctx, self_princ);
2252 krb5_cc_destroy(ctx, tmp_cc);
2253 return code;
2254 }
2255
2256 code = krb5_get_creds(ctx, options, tmp_cc,
2257 self_princ, &s4u2self_creds);
2258 krb5_get_creds_opt_free(ctx, options);
2259 krb5_free_principal(ctx, self_princ);
2260 if (code != 0) {
2261 krb5_free_principal(ctx, blacklist_principal);
2262 krb5_cc_destroy(ctx, tmp_cc);
2263 return code;
2264 }
2265
2266 if (!s4u2proxy) {
2267 krb5_cc_destroy(ctx, tmp_cc);
2268
2269 /*
2270 * Now make sure we store the impersonated principal
2271 * and creds instead of the TGT related stuff
2272 * in the krb5_ccache of the caller.
2273 */
2274 code = krb5_copy_creds_contents(ctx, s4u2self_creds,
2275 &store_creds);
2276 krb5_free_creds(ctx, s4u2self_creds);
2277 if (code != 0) {
2278 return code;
2279 }
2280
2281 /*
2282 * It's important to store the principal the KDC
2283 * returned, as otherwise the caller would not find
2284 * the S4U2Self ticket in the krb5_ccache lookup.
2285 */
2286 store_principal = store_creds.client;
2287 goto store;
2288 }
2289
2290 /*
2291 * We are trying S4U2Proxy:
2292 *
2293 * We need the ticket from the S4U2Self step
2294 * and our TGT in order to get the delegated ticket.
2295 */
2296 code = decode_Ticket((const uint8_t *)s4u2self_creds->ticket.data,
2297 s4u2self_creds->ticket.length,
2298 &s4u2self_ticket,
2299 &s4u2self_ticketlen);
2300 if (code != 0) {
2301 krb5_free_creds(ctx, s4u2self_creds);
2302 krb5_free_principal(ctx, blacklist_principal);
2303 krb5_cc_destroy(ctx, tmp_cc);
2304 return code;
2305 }
2306
2307 /*
2308 * we need to remember the client principal of the
2309 * S4U2Self stage and as it needs to match the one we
2310 * will get for the S4U2Proxy stage. We need this
2311 * in order to detect KDCs which does not support S4U2Proxy.
2312 */
2313 whitelist_principal = s4u2self_creds->client;
2314 s4u2self_creds->client = NULL;
2315 krb5_free_creds(ctx, s4u2self_creds);
2316
2317 /*
2318 * For S4U2Proxy we also got a target service principal,
2319 * which also belongs to our own realm (available on
2320 * our client principal).
2321 */
2322 code = krb5_parse_name(ctx, target_service, &target_princ);
2323 if (code != 0) {
2324 free_Ticket(&s4u2self_ticket);
2325 krb5_free_principal(ctx, whitelist_principal);
2326 krb5_free_principal(ctx, blacklist_principal);
2327 krb5_cc_destroy(ctx, tmp_cc);
2328 return code;
2329 }
2330
2331 code = krb5_principal_set_realm(ctx, target_princ, self_realm);
2332 if (code != 0) {
2333 free_Ticket(&s4u2self_ticket);
2334 krb5_free_principal(ctx, target_princ);
2335 krb5_free_principal(ctx, whitelist_principal);
2336 krb5_free_principal(ctx, blacklist_principal);
2337 krb5_cc_destroy(ctx, tmp_cc);
2338 return code;
2339 }
2340
2341 code = krb5_get_creds_opt_alloc(ctx, &options);
2342 if (code != 0) {
2343 free_Ticket(&s4u2self_ticket);
2344 krb5_free_principal(ctx, target_princ);
2345 krb5_free_principal(ctx, whitelist_principal);
2346 krb5_free_principal(ctx, blacklist_principal);
2347 krb5_cc_destroy(ctx, tmp_cc);
2348 return code;
2349 }
2350
2351 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
2352 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_CONSTRAINED_DELEGATION);
2353
2354 code = krb5_get_creds_opt_set_ticket(ctx, options, &s4u2self_ticket);
2355 free_Ticket(&s4u2self_ticket);
2356 if (code != 0) {
2357 krb5_get_creds_opt_free(ctx, options);
2358 krb5_free_principal(ctx, target_princ);
2359 krb5_free_principal(ctx, whitelist_principal);
2360 krb5_free_principal(ctx, blacklist_principal);
2361 krb5_cc_destroy(ctx, tmp_cc);
2362 return code;
2363 }
2364
2365 code = krb5_get_creds(ctx, options, tmp_cc,
2366 target_princ, &s4u2proxy_creds);
2367 krb5_get_creds_opt_free(ctx, options);
2368 krb5_free_principal(ctx, target_princ);
2369 krb5_cc_destroy(ctx, tmp_cc);
2370 if (code != 0) {
2371 krb5_free_principal(ctx, whitelist_principal);
2372 krb5_free_principal(ctx, blacklist_principal);
2373 return code;
2374 }
2375
2376 /*
2377 * Now make sure we store the impersonated principal
2378 * and creds instead of the TGT related stuff
2379 * in the krb5_ccache of the caller.
2380 */
2381 code = krb5_copy_creds_contents(ctx, s4u2proxy_creds,
2382 &store_creds);
2383 krb5_free_creds(ctx, s4u2proxy_creds);
2384 if (code != 0) {
2385 krb5_free_principal(ctx, whitelist_principal);
2386 krb5_free_principal(ctx, blacklist_principal);
2387 return code;
2388 }
2389
2390 /*
2391 * It's important to store the principal the KDC
2392 * returned, as otherwise the caller would not find
2393 * the S4U2Self ticket in the krb5_ccache lookup.
2394 */
2395 store_principal = store_creds.client;
2396
2397 store:
2398 if (blacklist_principal &&
2399 krb5_principal_compare(ctx, store_creds.client, blacklist_principal)) {
2400 char *sp = NULL;
2401 char *ip = NULL;
2402
2403 code = krb5_unparse_name(ctx, blacklist_principal, &sp);
2404 if (code != 0) {
2405 sp = NULL;
2406 }
2407 code = krb5_unparse_name(ctx, impersonate_principal, &ip);
2408 if (code != 0) {
2409 ip = NULL;
2410 }
2411 DEBUG(1, ("kerberos_kinit_password_cc: "
2412 "KDC returned self principal[%s] while impersonating [%s]\n",
2413 sp?sp:"<no memory>",
2414 ip?ip:"<no memory>"));
2415
2416 SAFE_FREE(sp);
2417 SAFE_FREE(ip);
2418
2419 krb5_free_principal(ctx, whitelist_principal);
2420 krb5_free_principal(ctx, blacklist_principal);
2421 krb5_free_cred_contents(ctx, &store_creds);
2422 return KRB5_FWD_BAD_PRINCIPAL;
2423 }
2424 if (blacklist_principal) {
2425 krb5_free_principal(ctx, blacklist_principal);
2426 }
2427
2428 if (whitelist_principal &&
2429 !krb5_principal_compare(ctx, store_creds.client, whitelist_principal)) {
2430 char *sp = NULL;
2431 char *ep = NULL;
2432
2433 code = krb5_unparse_name(ctx, store_creds.client, &sp);
2434 if (code != 0) {
2435 sp = NULL;
2436 }
2437 code = krb5_unparse_name(ctx, whitelist_principal, &ep);
2438 if (code != 0) {
2439 ep = NULL;
2440 }
2441 DEBUG(1, ("kerberos_kinit_password_cc: "
2442 "KDC returned wrong principal[%s] we expected [%s]\n",
2443 sp?sp:"<no memory>",
2444 ep?ep:"<no memory>"));
2445
2446 SAFE_FREE(sp);
2447 SAFE_FREE(ep);
2448
2449 krb5_free_principal(ctx, whitelist_principal);
2450 krb5_free_cred_contents(ctx, &store_creds);
2451 return KRB5_FWD_BAD_PRINCIPAL;
2452 }
2453 if (whitelist_principal) {
2454 krb5_free_principal(ctx, whitelist_principal);
2455 }
2456
2457 code = krb5_cc_initialize(ctx, store_cc, store_principal);
2458 if (code != 0) {
2459 krb5_free_cred_contents(ctx, &store_creds);
2460 return code;
2461 }
2462
2463 code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
2464 if (code != 0) {
2465 krb5_free_cred_contents(ctx, &store_creds);
2466 return code;
2467 }
2468
2469 if (expire_time) {
2470 *expire_time = (time_t) store_creds.times.endtime;
2471 }
2472
2473 if (kdc_time) {
2474 *kdc_time = (time_t) store_creds.times.starttime;
2475 }
2476
2477 krb5_free_cred_contents(ctx, &store_creds);
2478
2479 return 0;
2480 }
2481 #endif
2482
2483 #if !defined(HAVE_KRB5_MAKE_PRINCIPAL) && defined(HAVE_KRB5_BUILD_PRINCIPAL_ALLOC_VA)
2484 krb5_error_code smb_krb5_make_principal(krb5_context context,
2485 krb5_principal *principal,
2486 const char *_realm, ...)
2487 {
2488 krb5_error_code code;
2489 bool free_realm;
2490 char *realm;
2491 va_list ap;
2492
2493 if (_realm) {
2494 realm = discard_const_p(char, _realm);
2495 free_realm = false;
2496 } else {
2497 code = krb5_get_default_realm(context, &realm);
2498 if (code) {
2499 return code;
2500 }
2501 free_realm = true;
2502 }
2503
2504 va_start(ap, _realm);
2505 code = krb5_build_principal_alloc_va(context, principal,
2506 strlen(realm), realm,
2507 ap);
2508 va_end(ap);
2509
2510 if (free_realm) {
2511 krb5_free_default_realm(context, realm);
2512 }
2513
2514 return code;
2515 }
2516 #endif
2517
2518 #if !defined(HAVE_KRB5_CC_GET_LIFETIME) && defined(HAVE_KRB5_CC_RETRIEVE_CRED)
2519 /**
2520 * @brief Get the lifetime of the initial ticket in the cache.
2521 *
2522 * @param[in] context The kerberos context.
2523 *
2524 * @param[in] id The credential cache to get the ticket lifetime.
2525 *
2526 * @param[out] t A pointer to a time value to store the lifetime.
2527 *
2528 * @return 0 on success, a krb5_error_code on error.
2529 */
2530 krb5_error_code smb_krb5_cc_get_lifetime(krb5_context context,
2531 krb5_ccache id,
2532 time_t *t)
2533 {
2534 krb5_cc_cursor cursor;
2535 krb5_error_code kerr;
2536 krb5_creds cred;
2537 krb5_timestamp now;
2538
2539 *t = 0;
2540
2541 kerr = krb5_timeofday(context, &now);
2542 if (kerr) {
2543 return kerr;
2544 }
2545
2546 kerr = krb5_cc_start_seq_get(context, id, &cursor);
2547 if (kerr) {
2548 return kerr;
2549 }
2550
2551 while ((kerr = krb5_cc_next_cred(context, id, &cursor, &cred)) == 0) {
2552 #ifndef HAVE_FLAGS_IN_KRB5_CREDS
2553 if (cred.ticket_flags & TKT_FLG_INITIAL) {
2554 #else
2555 if (cred.flags.b.initial) {
2556 #endif
2557 if (now < cred.times.endtime) {
2558 *t = (time_t) (cred.times.endtime - now);
2559 }
2560 krb5_free_cred_contents(context, &cred);
2561 break;
2562 }
2563 krb5_free_cred_contents(context, &cred);
2564 }
2565
2566 krb5_cc_end_seq_get(context, id, &cursor);
2567
2568 return kerr;
2569 }
2570 #endif /* HAVE_KRB5_CC_GET_LIFETIME */
2571
2572 #if !defined(HAVE_KRB5_FREE_CHECKSUM_CONTENTS) && defined(HAVE_FREE_CHECKSUM)
2573 void smb_krb5_free_checksum_contents(krb5_context ctx, krb5_checksum *cksum)
2574 {
2575 free_Checksum(cksum);
2576 }
2577 #endif
2578
2579 krb5_error_code smb_krb5_make_pac_checksum(TALLOC_CTX *mem_ctx,
2580 DATA_BLOB *pac_data,
2581 krb5_context context,
2582 const krb5_keyblock *keyblock,
2583 uint32_t *sig_type,
2584 DATA_BLOB *sig_blob)
2585 {
2586 krb5_error_code ret;
2587 krb5_checksum cksum;
2588 #if defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CREATE_CHECKSUM)
2589 krb5_crypto crypto;
2590
2591
2592 ret = krb5_crypto_init(context,
2593 keyblock,
2594 0,
2595 &crypto);
2596 if (ret) {
2597 DEBUG(0,("krb5_crypto_init() failed: %s\n",
2598 smb_get_krb5_error_message(context, ret, mem_ctx)));
2599 return ret;
2600 }
2601 ret = krb5_create_checksum(context,
2602 crypto,
2603 KRB5_KU_OTHER_CKSUM,
2604 0,
2605 pac_data->data,
2606 pac_data->length,
2607 &cksum);
2608 if (ret) {
2609 DEBUG(2, ("PAC Verification failed: %s\n",
2610 smb_get_krb5_error_message(context, ret, mem_ctx)));
2611 }
2612
2613 krb5_crypto_destroy(context, crypto);
2614
2615 if (ret) {
2616 return ret;
2617 }
2618
2619 *sig_type = cksum.cksumtype;
2620 *sig_blob = data_blob_talloc(mem_ctx,
2621 cksum.checksum.data,
2622 cksum.checksum.length);
2623 #elif defined(HAVE_KRB5_C_MAKE_CHECKSUM)
2624 krb5_data input;
2625
2626 input.data = (char *)pac_data->data;
2627 input.length = pac_data->length;
2628
2629 ret = krb5_c_make_checksum(context,
2630 0,
2631 keyblock,
2632 KRB5_KEYUSAGE_APP_DATA_CKSUM,
2633 &input,
2634 &cksum);
2635 if (ret) {
2636 DEBUG(2, ("PAC Verification failed: %s\n",
2637 smb_get_krb5_error_message(context, ret, mem_ctx)));
2638 return ret;
2639 }
2640
2641 *sig_type = cksum.checksum_type;
2642 *sig_blob = data_blob_talloc(mem_ctx,
2643 cksum.contents,
2644 cksum.length);
2645
2646 #else
2647 #error krb5_create_checksum or krb5_c_make_checksum not available
2648 #endif /* HAVE_KRB5_C_MAKE_CHECKSUM */
2649 smb_krb5_free_checksum_contents(context, &cksum);
2650
2651 return 0;
2652 }
2653
2654
2655 /*
2656 * smb_krb5_principal_get_realm
2657 *
2658 * @brief Get realm of a principal
2659 *
2660 * @param[in] context The krb5_context
2661 * @param[in] principal The principal
2662 * @return pointer to the realm
2663 *
2664 * Caller must free if the return value is not NULL.
2665 *
2666 */
2667
2668 char *smb_krb5_principal_get_realm(krb5_context context,
2669 krb5_const_principal principal)
2670 {
2671 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2672 return strdup(discard_const_p(char, krb5_principal_get_realm(context, principal)));
2673 #elif defined(krb5_princ_realm) /* MIT */
2674 krb5_data *realm;
2675 realm = discard_const_p(krb5_data,
2676 krb5_princ_realm(context, principal));
2677 return strndup(realm->data, realm->length);
2678 #else
2679 #error UNKNOWN_GET_PRINC_REALM_FUNCTIONS
2680 #endif
2681 }
2682
2683 /*
2684 * smb_krb5_principal_set_realm
2685 *
2686 * @brief Get realm of a principal
2687 *
2688 * @param[in] context The krb5_context
2689 * @param[in] principal The principal
2690 * @param[in] realm The realm
2691 * @return 0 on success, a krb5_error_code on error.
2692 *
2693 */
2694
2695 krb5_error_code smb_krb5_principal_set_realm(krb5_context context,
2696 krb5_principal principal,
2697 const char *realm)
2698 {
2699 #ifdef HAVE_KRB5_PRINCIPAL_SET_REALM /* Heimdal */
2700 return krb5_principal_set_realm(context, principal, realm);
2701 #elif defined(krb5_princ_realm) && defined(krb5_princ_set_realm) /* MIT */
2702 krb5_error_code ret;
2703 krb5_data data;
2704 krb5_data *old_data;
2705
2706 old_data = krb5_princ_realm(context, principal);
2707
2708 ret = krb5_copy_data_contents(&data,
2709 realm,
2710 strlen(realm));
2711 if (ret) {
2712 return ret;
2713 }
2714
2715 /* free realm before setting */
2716 free(old_data->data);
2717
2718 krb5_princ_set_realm(context, principal, &data);
2719
2720 return ret;
2721 #else
2722 #error UNKNOWN_PRINC_SET_REALM_FUNCTION
2723 #endif
2724 }
2725
2726
2727 /************************************************************************
2728 Routine to get the default realm from the kerberos credentials cache.
2729 Caller must free if the return value is not NULL.
2730 ************************************************************************/
2731
2732 static char *smb_krb5_get_default_realm_from_ccache(TALLOC_CTX *mem_ctx)
2733 {
2734 char *realm = NULL;
2735 krb5_context ctx = NULL;
2736 krb5_ccache cc = NULL;
2737 krb5_principal princ = NULL;
2738
2739 initialize_krb5_error_table();
2740 if (krb5_init_context(&ctx)) {
2741 return NULL;
2742 }
2743
2744 DEBUG(5,("kerberos_get_default_realm_from_ccache: "
2745 "Trying to read krb5 cache: %s\n",
2746 krb5_cc_default_name(ctx)));
2747 if (krb5_cc_default(ctx, &cc)) {
2748 DEBUG(5,("kerberos_get_default_realm_from_ccache: "
2749 "failed to read default cache\n"));
2750 goto out;
2751 }
2752 if (krb5_cc_get_principal(ctx, cc, &princ)) {
2753 DEBUG(5,("kerberos_get_default_realm_from_ccache: "
2754 "failed to get default principal\n"));
2755 goto out;
2756 }
2757
2758 #if defined(HAVE_KRB5_PRINCIPAL_GET_REALM)
2759 realm = talloc_strdup(mem_ctx, krb5_principal_get_realm(ctx, princ));
2760 #elif defined(HAVE_KRB5_PRINC_REALM)
2761 {
2762 krb5_data *realm_data = krb5_princ_realm(ctx, princ);
2763 realm = talloc_strndup(mem_ctx, realm_data->data, realm_data->length);
2764 }
2765 #endif
2766
2767 out:
2768
2769 if (ctx) {
2770 if (princ) {
2771 krb5_free_principal(ctx, princ);
2772 }
2773 if (cc) {
2774 krb5_cc_close(ctx, cc);
2775 }
2776 krb5_free_context(ctx);
2777 }
2778
2779 return realm;
2780 }
2781
2782 /************************************************************************
2783 Routine to get the realm from a given DNS name.
2784 ************************************************************************/
2785
2786 static char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
2787 const char *hostname)
2788 {
2789 #if defined(HAVE_KRB5_REALM_TYPE)
2790 /* Heimdal. */
2791 krb5_realm *realm_list = NULL;
2792 #else
2793 /* MIT */
2794 char **realm_list = NULL;
2795 #endif
2796 char *realm = NULL;
2797 krb5_error_code kerr;
2798 krb5_context ctx = NULL;
2799
2800 initialize_krb5_error_table();
2801 if (krb5_init_context(&ctx)) {
2802 return NULL;
2803 }
2804
2805 kerr = krb5_get_host_realm(ctx, hostname, &realm_list);
2806 if (kerr != 0) {
2807 DEBUG(3,("kerberos_get_realm_from_hostname %s: "
2808 "failed %s\n",
2809 hostname ? hostname : "(NULL)",
2810 error_message(kerr) ));
2811 goto out;
2812 }
2813
2814 if (realm_list && realm_list[0]) {
2815 realm = talloc_strdup(mem_ctx, realm_list[0]);
2816 }
2817
2818 out:
2819
2820 if (ctx) {
2821 if (realm_list) {
2822 krb5_free_host_realm(ctx, realm_list);
2823 realm_list = NULL;
2824 }
2825 krb5_free_context(ctx);
2826 ctx = NULL;
2827 }
2828 return realm;
2829 }
2830
2831 char *kerberos_get_principal_from_service_hostname(TALLOC_CTX *mem_ctx,
2832 const char *service,
2833 const char *remote_name,
2834 const char *default_realm)
2835 {
2836 char *realm = NULL;
2837 char *host = NULL;
2838 char *principal;
2839 host = strchr_m(remote_name, '.');
2840 if (host) {
2841 /* DNS name. */
2842 realm = smb_krb5_get_realm_from_hostname(talloc_tos(),
2843 remote_name);
2844 } else {
2845 /* NetBIOS name - use our realm. */
2846 realm = smb_krb5_get_default_realm_from_ccache(talloc_tos());
2847 }
2848
2849 if (realm == NULL || *realm == '\0') {
2850 realm = talloc_strdup(talloc_tos(), default_realm);
2851 if (!realm) {
2852 return NULL;
2853 }
2854 DEBUG(3,("kerberos_get_principal_from_service_hostname: "
2855 "cannot get realm from, "
2856 "desthost %s or default ccache. Using default "
2857 "smb.conf realm %s\n",
2858 remote_name,
2859 realm));
2860 }
2861
2862 principal = talloc_asprintf(mem_ctx,
2863 "%s/%s@%s",
2864 service, remote_name,
2865 realm);
2866 TALLOC_FREE(realm);
2867 return principal;
2868 }
2869
2870 char *smb_get_krb5_error_message(krb5_context context,
2871 krb5_error_code code,
2872 TALLOC_CTX *mem_ctx)
2873 {
2874 char *ret;
2875
2876 #if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
2877 const char *context_error = krb5_get_error_message(context, code);
2878 if (context_error) {
2879 ret = talloc_asprintf(mem_ctx, "%s: %s",
2880 error_message(code), context_error);
2881 krb5_free_error_message(context, context_error);
2882 return ret;
2883 }
2884 #endif
2885 ret = talloc_strdup(mem_ctx, error_message(code));
2886 return ret;
2887 }
2888
2889
2890 /**
2891 * @brief Return the kerberos library setting for "libdefaults:allow_weak_crypto"
2892 *
2893 * @param context The krb5_context
2894 *
2895 * @return krb5_boolean
2896 *
2897 * Function returns true if weak crypto is allowd, false if not
2898 */
2899
2900 krb5_boolean smb_krb5_get_allowed_weak_crypto(krb5_context context)
2901 #if defined(HAVE_KRB5_CONFIG_GET_BOOL_DEFAULT)
2902 {
2903 return krb5_config_get_bool_default(context,
2904 NULL,
2905 FALSE,
2906 "libdefaults",
2907 "allow_weak_crypto",
2908 NULL);
2909 }
2910 #elif defined(HAVE_PROFILE_H) && defined(HAVE_KRB5_GET_PROFILE)
2911 {
2912 #include <profile.h>
2913 krb5_error_code ret;
2914 krb5_boolean ret_default = false;
2915 profile_t profile;
2916 int ret_profile;
2917
2918 ret = krb5_get_profile(context,
2919 &profile);
2920 if (ret) {
2921 return ret_default;
2922 }
2923
2924 ret = profile_get_boolean(profile,
2925 "libdefaults",
2926 "allow_weak_crypto",
2927 NULL, /* subsubname */
2928 ret_default, /* def_val */
2929 &ret_profile /* *ret_default */);
2930 if (ret) {
2931 return ret_default;
2932 }
2933
2934 profile_release(profile);
2935
2936 return ret_profile;
2937 }
2938 #else
2939 #error UNKNOWN_KRB5_CONFIG_ROUTINES
2940 #endif
2941
2942 /**
2943 * @brief Return the type of a krb5_principal
2944 *
2945 * @param context The krb5_context
2946 * @param principal The const krb5_principal
2947 *
2948 * @return integer type of the principal
2949 */
2950 int smb_krb5_principal_get_type(krb5_context context,
2951 krb5_const_principal principal)
2952 {
2953 #ifdef HAVE_KRB5_PRINCIPAL_GET_TYPE /* Heimdal */
2954 return krb5_principal_get_type(context, principal);
2955 #elif defined(krb5_princ_type) /* MIT */
2956 return krb5_princ_type(context, principal);
2957 #else
2958 #error UNKNOWN_PRINC_GET_TYPE_FUNCTION
2959 #endif
2960 }
2961
2962 /**
2963 * @brief Set the type of a krb5_principal
2964 *
2965 * @param context The krb5_context
2966 * @param principal The const krb5_principal
2967 * @param type The principal type
2968 *
2969 */
2970 void smb_krb5_principal_set_type(krb5_context context,
2971 krb5_principal principal,
2972 int type)
2973 {
2974 #ifdef HAVE_KRB5_PRINCIPAL_SET_TYPE /* Heimdal */
2975 krb5_principal_set_type(context, principal, type);
2976 #elif defined(krb5_princ_type) /* MIT */
2977 krb5_princ_type(context, principal) = type;
2978 #else
2979 #error UNKNOWN_PRINC_SET_TYPE_FUNCTION
2980 #endif
2981 }
2982
2983 /**
2984 * @brief Generate a krb5 warning, forwarding to com_err
2985 *
2986 * @param context The krb5_context
2987 * @param fmt The message format
2988 * @param ... The message arguments
2989 *
2990 * @return
2991 */
2992 #if !defined(HAVE_KRB5_WARNX)
2993 krb5_error_code krb5_warnx(krb5_context context, const char *fmt, ...)
2994 {
2995 va_list args;
2996
2997 va_start(args, fmt);
2998 com_err_va("kdb_samba", errno, fmt, args);
2999 va_end(args);
3000
3001 return 0;
3002 }
3003 #endif
3004
3005 #else /* HAVE_KRB5 */
3006 /* this saves a few linking headaches */
3007 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
3008 const char *principal, time_t time_offset,
3009 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
3010 uint32_t extra_ap_opts,
3011 const char *ccname, time_t *tgs_expire,
3012 const char *impersonate_princ_s)
3013 {
3014 DEBUG(0,("NO KERBEROS SUPPORT\n"));
3015 return 1;
3016 }
3017
3018 #endif /* HAVE_KRB5 */
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