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lib: uid_wrapper: Fix setgroups and syscall detection on a system without native...
[Samba.git] / lib / krb5_wrap / krb5_samba.c
blob5f0378b26120c5e320b65176a6bd3b61905b2d09
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 ommitted, 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_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_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 err = krb5_auth_con_getremotesubkey(context,
870 auth_context, &skey);
871 } else {
872 err = krb5_auth_con_getlocalsubkey(context,
873 auth_context, &skey);
874 }
875
876 if (err || skey == NULL) {
877 DEBUG(10, ("KRB5 error getting session key %d\n", err));
878 goto done;
879 }
880
881 DEBUG(10, ("Got KRB5 session key of length %d\n",
882 (int)KRB5_KEY_LENGTH(skey)));
883
884 *session_key = data_blob_talloc(mem_ctx,
885 KRB5_KEY_DATA(skey),
886 KRB5_KEY_LENGTH(skey));
887 dump_data_pw("KRB5 Session Key:\n",
888 session_key->data,
889 session_key->length);
890
891 ret = true;
892
893 done:
894 if (skey) {
895 krb5_free_keyblock(context, skey);
896 }
897
898 return ret;
899 }
900
901
902 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
903 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
904
905 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
906 {
907 static krb5_data kdata;
908
909 kdata.data = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i));
910 kdata.length = strlen((const char *)kdata.data);
911 return &kdata;
912 }
913 #endif
914
915 /*
916 * @brief Get talloced string component of a principal
917 *
918 * @param[in] mem_ctx The TALLOC_CTX
919 * @param[in] context The krb5_context
920 * @param[in] principal The principal
921 * @param[in] component The component
922 * @return string component
923 *
924 * Caller must talloc_free if the return value is not NULL.
925 *
926 */
927
928 /* caller has to free returned string with free() */
929 char *smb_krb5_principal_get_comp_string(TALLOC_CTX *mem_ctx,
930 krb5_context context,
931 krb5_const_principal principal,
932 unsigned int component)
933 {
934 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING)
935 return talloc_strdup(mem_ctx, krb5_principal_get_comp_string(context, principal, component));
936 #else
937 krb5_data *data;
938
939 if (component >= krb5_princ_size(context, principal)) {
940 return NULL;
941 }
942
943 data = krb5_princ_component(context, principal, component);
944 if (data == NULL) {
945 return NULL;
946 }
947
948 return talloc_strndup(mem_ctx, data->data, data->length);
949 #endif
950 }
951
952 /* Prototypes */
953
954 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, /* FILE:/tmp/krb5cc_0 */
955 const char *client_string, /* gd@BER.SUSE.DE */
956 const char *service_string, /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
957 time_t *expire_time)
958 {
959 krb5_error_code ret;
960 krb5_context context = NULL;
961 krb5_ccache ccache = NULL;
962 krb5_principal client = NULL;
963 krb5_creds creds, creds_in;
964
965 ZERO_STRUCT(creds);
966 ZERO_STRUCT(creds_in);
967
968 initialize_krb5_error_table();
969 ret = krb5_init_context(&context);
970 if (ret) {
971 goto done;
972 }
973
974 if (!ccache_string) {
975 ccache_string = krb5_cc_default_name(context);
976 }
977
978 if (!ccache_string) {
979 ret = EINVAL;
980 goto done;
981 }
982
983 DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
984
985 /* FIXME: we should not fall back to defaults */
986 ret = krb5_cc_resolve(context, discard_const_p(char, ccache_string), &ccache);
987 if (ret) {
988 goto done;
989 }
990
991 if (client_string) {
992 ret = smb_krb5_parse_name(context, client_string, &client);
993 if (ret) {
994 goto done;
995 }
996 } else {
997 ret = krb5_cc_get_principal(context, ccache, &client);
998 if (ret) {
999 goto done;
1000 }
1001 }
1002
1003 ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string));
1004 if (ret) {
1005 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1006 goto done;
1007 }
1008
1009 /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1010 ret = krb5_cc_initialize(context, ccache, client);
1011 if (ret) {
1012 goto done;
1013 }
1014
1015 ret = krb5_cc_store_cred(context, ccache, &creds);
1016
1017 if (expire_time) {
1018 *expire_time = (time_t) creds.times.endtime;
1019 }
1020
1021 done:
1022 krb5_free_cred_contents(context, &creds_in);
1023 krb5_free_cred_contents(context, &creds);
1024
1025 if (client) {
1026 krb5_free_principal(context, client);
1027 }
1028 if (ccache) {
1029 krb5_cc_close(context, ccache);
1030 }
1031 if (context) {
1032 krb5_free_context(context);
1033 }
1034
1035 return ret;
1036 }
1037
1038 krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1039 {
1040 krb5_error_code ret = 0;
1041 if (addr == NULL) {
1042 return ret;
1043 }
1044 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1045 krb5_free_addresses(context, addr->addrs);
1046 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1047 ret = krb5_free_addresses(context, addr->addrs);
1048 SAFE_FREE(addr->addrs);
1049 #endif
1050 SAFE_FREE(addr);
1051 addr = NULL;
1052 return ret;
1053 }
1054
1055 #define MAX_NETBIOSNAME_LEN 16
1056 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr,
1057 const char *netbios_name)
1058 {
1059 krb5_error_code ret = 0;
1060 char buf[MAX_NETBIOSNAME_LEN];
1061 int len;
1062 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1063 krb5_address **addrs = NULL;
1064 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1065 krb5_addresses *addrs = NULL;
1066 #endif
1067
1068 *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1069 if (*kerb_addr == NULL) {
1070 return ENOMEM;
1071 }
1072
1073 /* temporarily duplicate put_name() code here to avoid dependency
1074 * issues for a 5 lines function */
1075 len = strlen(netbios_name);
1076 memcpy(buf, netbios_name,
1077 (len < MAX_NETBIOSNAME_LEN) ? len : MAX_NETBIOSNAME_LEN - 1);
1078 if (len < MAX_NETBIOSNAME_LEN - 1) {
1079 memset(buf + len, ' ', MAX_NETBIOSNAME_LEN - 1 - len);
1080 }
1081 buf[MAX_NETBIOSNAME_LEN - 1] = 0x20;
1082
1083 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1084 {
1085 int num_addr = 2;
1086
1087 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1088 if (addrs == NULL) {
1089 SAFE_FREE(*kerb_addr);
1090 return ENOMEM;
1091 }
1092
1093 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1094
1095 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1096 if (addrs[0] == NULL) {
1097 SAFE_FREE(addrs);
1098 SAFE_FREE(*kerb_addr);
1099 return ENOMEM;
1100 }
1101
1102 addrs[0]->magic = KV5M_ADDRESS;
1103 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1104 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1105 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1106 if (addrs[0]->contents == NULL) {
1107 SAFE_FREE(addrs[0]);
1108 SAFE_FREE(addrs);
1109 SAFE_FREE(*kerb_addr);
1110 return ENOMEM;
1111 }
1112
1113 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1114
1115 addrs[1] = NULL;
1116 }
1117 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1118 {
1119 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1120 if (addrs == NULL) {
1121 SAFE_FREE(*kerb_addr);
1122 return ENOMEM;
1123 }
1124
1125 memset(addrs, 0, sizeof(krb5_addresses));
1126
1127 addrs->len = 1;
1128 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1129 if (addrs->val == NULL) {
1130 SAFE_FREE(addrs);
1131 SAFE_FREE(kerb_addr);
1132 return ENOMEM;
1133 }
1134
1135 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1136 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1137 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1138 if (addrs->val[0].address.data == NULL) {
1139 SAFE_FREE(addrs->val);
1140 SAFE_FREE(addrs);
1141 SAFE_FREE(*kerb_addr);
1142 return ENOMEM;
1143 }
1144
1145 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1146 }
1147 #else
1148 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1149 #endif
1150 (*kerb_addr)->addrs = addrs;
1151
1152 return ret;
1153 }
1154
1155 void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1156 {
1157 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1158 krb5_free_error_contents(context, krberror);
1159 #else /* MIT */
1160 krb5_free_error(context, krberror);
1161 #endif
1162 }
1163
1164 krb5_error_code handle_krberror_packet(krb5_context context,
1165 krb5_data *packet)
1166 {
1167 krb5_error_code ret;
1168 bool got_error_code = false;
1169
1170 DEBUG(10,("handle_krberror_packet: got error packet\n"));
1171
1172 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1173 {
1174 krb5_error krberror;
1175
1176 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1177 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1178 error_message(ret)));
1179 return ret;
1180 }
1181
1182 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1183 ret = (krb5_error_code) krberror.error_code;
1184 got_error_code = true;
1185 }
1186
1187 smb_krb5_free_error(context, &krberror);
1188 }
1189 #else /* MIT */
1190 {
1191 krb5_error *krberror;
1192
1193 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1194 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1195 error_message(ret)));
1196 return ret;
1197 }
1198
1199 if (krberror->e_data.data == NULL) {
1200 #if defined(ERROR_TABLE_BASE_krb5)
1201 ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1202 #else
1203 ret = (krb5_error_code)krberror->error;
1204 #endif
1205 got_error_code = true;
1206 }
1207 smb_krb5_free_error(context, krberror);
1208 }
1209 #endif
1210 if (got_error_code) {
1211 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1212 error_message(ret), ret));
1213 }
1214 return ret;
1215 }
1216
1217 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1218 krb5_get_init_creds_opt **opt)
1219 {
1220 /* Heimdal or modern MIT version */
1221 return krb5_get_init_creds_opt_alloc(context, opt);
1222 }
1223
1224 void smb_krb5_get_init_creds_opt_free(krb5_context context,
1225 krb5_get_init_creds_opt *opt)
1226 {
1227 /* Modern MIT or Heimdal version */
1228 krb5_get_init_creds_opt_free(context, opt);
1229 }
1230
1231 krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1232 {
1233 return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1234 }
1235
1236 krb5_error_code smb_krb5_kt_free_entry(krb5_context context,
1237 krb5_keytab_entry *kt_entry)
1238 {
1239 /* Try krb5_free_keytab_entry_contents first, since
1240 * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
1241 * krb5_kt_free_entry but only has a prototype for the first, while the
1242 * second is considered private.
1243 */
1244 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
1245 return krb5_free_keytab_entry_contents(context, kt_entry);
1246 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
1247 return krb5_kt_free_entry(context, kt_entry);
1248 #else
1249 #error UNKNOWN_KT_FREE_FUNCTION
1250 #endif
1251 }
1252
1253
1254 /* caller needs to free etype_s */
1255 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1256 krb5_enctype enctype,
1257 char **etype_s)
1258 {
1259 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1260 return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1261 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1262 char buf[256];
1263 krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1264 if (ret) {
1265 return ret;
1266 }
1267 *etype_s = SMB_STRDUP(buf);
1268 if (!*etype_s) {
1269 return ENOMEM;
1270 }
1271 return ret;
1272 #else
1273 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1274 #endif
1275 }
1276
1277 /**********************************************************************
1278 * Open a krb5 keytab with flags, handles readonly or readwrite access and
1279 * allows to process non-default keytab names.
1280 * @param context krb5_context
1281 * @param keytab_name_req string
1282 * @param write_access bool if writable keytab is required
1283 * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1284 * @return krb5_error_code
1285 **********************************************************************/
1286
1287 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1288 #ifndef MAX_KEYTAB_NAME_LEN
1289 #define MAX_KEYTAB_NAME_LEN 1100
1290 #endif
1291
1292 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1293 const char *keytab_name_req,
1294 bool write_access,
1295 krb5_keytab *keytab)
1296 {
1297 krb5_error_code ret = 0;
1298 TALLOC_CTX *mem_ctx;
1299 char keytab_string[MAX_KEYTAB_NAME_LEN];
1300 char *kt_str = NULL;
1301 bool found_valid_name = false;
1302 const char *pragma = "FILE";
1303 const char *tmp = NULL;
1304
1305 if (!write_access && !keytab_name_req) {
1306 /* caller just wants to read the default keytab readonly, so be it */
1307 return krb5_kt_default(context, keytab);
1308 }
1309
1310 mem_ctx = talloc_init("smb_krb5_open_keytab");
1311 if (!mem_ctx) {
1312 return ENOMEM;
1313 }
1314
1315 #ifdef HAVE_WRFILE_KEYTAB
1316 if (write_access) {
1317 pragma = "WRFILE";
1318 }
1319 #endif
1320
1321 if (keytab_name_req) {
1322
1323 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1324 ret = KRB5_CONFIG_NOTENUFSPACE;
1325 goto out;
1326 }
1327
1328 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1329 (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1330 tmp = keytab_name_req;
1331 goto resolve;
1332 }
1333
1334 if (keytab_name_req[0] != '/') {
1335 ret = KRB5_KT_BADNAME;
1336 goto out;
1337 }
1338
1339 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1340 if (!tmp) {
1341 ret = ENOMEM;
1342 goto out;
1343 }
1344
1345 goto resolve;
1346 }
1347
1348 /* we need to handle more complex keytab_strings, like:
1349 * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1350
1351 ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1352 if (ret) {
1353 goto out;
1354 }
1355
1356 DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1357
1358 tmp = talloc_strdup(mem_ctx, keytab_string);
1359 if (!tmp) {
1360 ret = ENOMEM;
1361 goto out;
1362 }
1363
1364 if (strncmp(tmp, "ANY:", 4) == 0) {
1365 tmp += 4;
1366 }
1367
1368 memset(&keytab_string, '\0', sizeof(keytab_string));
1369
1370 while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1371 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1372 found_valid_name = true;
1373 tmp = kt_str;
1374 tmp += 7;
1375 }
1376
1377 if (strncmp(kt_str, "FILE:", 5) == 0) {
1378 found_valid_name = true;
1379 tmp = kt_str;
1380 tmp += 5;
1381 }
1382
1383 if (tmp[0] == '/') {
1384 /* Treat as a FILE: keytab definition. */
1385 found_valid_name = true;
1386 }
1387
1388 if (found_valid_name) {
1389 if (tmp[0] != '/') {
1390 ret = KRB5_KT_BADNAME;
1391 goto out;
1392 }
1393
1394 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1395 if (!tmp) {
1396 ret = ENOMEM;
1397 goto out;
1398 }
1399 break;
1400 }
1401 }
1402
1403 if (!found_valid_name) {
1404 ret = KRB5_KT_UNKNOWN_TYPE;
1405 goto out;
1406 }
1407
1408 resolve:
1409 DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1410 ret = krb5_kt_resolve(context, tmp, keytab);
1411
1412 out:
1413 TALLOC_FREE(mem_ctx);
1414 return ret;
1415 }
1416
1417 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1418 krb5_context context,
1419 krb5_keytab keytab,
1420 const char **keytab_name)
1421 {
1422 char keytab_string[MAX_KEYTAB_NAME_LEN];
1423 krb5_error_code ret = 0;
1424
1425 ret = krb5_kt_get_name(context, keytab,
1426 keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1427 if (ret) {
1428 return ret;
1429 }
1430
1431 *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1432 if (!*keytab_name) {
1433 return ENOMEM;
1434 }
1435
1436 return ret;
1437 }
1438
1439 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1440 defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1441 defined(HAVE_KRB5_GET_CREDS)
1442 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1443 krb5_ccache ccache,
1444 krb5_principal me,
1445 krb5_principal server,
1446 krb5_principal impersonate_princ,
1447 krb5_creds **out_creds)
1448 {
1449 krb5_error_code ret;
1450 krb5_get_creds_opt opt;
1451
1452 ret = krb5_get_creds_opt_alloc(context, &opt);
1453 if (ret) {
1454 goto done;
1455 }
1456 krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1457
1458 if (impersonate_princ) {
1459 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1460 impersonate_princ);
1461 if (ret) {
1462 goto done;
1463 }
1464 }
1465
1466 ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1467 if (ret) {
1468 goto done;
1469 }
1470
1471 done:
1472 if (opt) {
1473 krb5_get_creds_opt_free(context, opt);
1474 }
1475 return ret;
1476 }
1477 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1478
1479 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1480
1481 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1482 krb5_error_code KRB5_CALLCONV
1483 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1484 krb5_ccache ccache, krb5_creds *in_creds,
1485 krb5_data *subject_cert,
1486 krb5_creds **out_creds);
1487 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1488
1489 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1490 krb5_ccache ccache,
1491 krb5_principal me,
1492 krb5_principal server,
1493 krb5_principal impersonate_princ,
1494 krb5_creds **out_creds)
1495 {
1496 krb5_error_code ret;
1497 krb5_creds in_creds;
1498
1499 ZERO_STRUCT(in_creds);
1500
1501 if (impersonate_princ) {
1502
1503 in_creds.server = me;
1504 in_creds.client = impersonate_princ;
1505
1506 ret = krb5_get_credentials_for_user(context,
1507 0, /* krb5_flags options */
1508 ccache,
1509 &in_creds,
1510 NULL, /* krb5_data *subject_cert */
1511 out_creds);
1512 } else {
1513 in_creds.client = me;
1514 in_creds.server = server;
1515
1516 ret = krb5_get_credentials(context, 0, ccache,
1517 &in_creds, out_creds);
1518 }
1519
1520 return ret;
1521 }
1522 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1523
1524 /*
1525 * smb_krb5_get_credentials
1526 *
1527 * @brief Get krb5 credentials for a server
1528 *
1529 * @param[in] context An initialized krb5_context
1530 * @param[in] ccache An initialized krb5_ccache
1531 * @param[in] me The krb5_principal of the caller
1532 * @param[in] server The krb5_principal of the requested service
1533 * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1534 * @param[out] out_creds The returned krb5_creds structure
1535 * @return krb5_error_code
1536 *
1537 */
1538 krb5_error_code smb_krb5_get_credentials(krb5_context context,
1539 krb5_ccache ccache,
1540 krb5_principal me,
1541 krb5_principal server,
1542 krb5_principal impersonate_princ,
1543 krb5_creds **out_creds)
1544 {
1545 krb5_error_code ret;
1546 krb5_creds *creds = NULL;
1547
1548 if (out_creds != NULL) {
1549 *out_creds = NULL;
1550 }
1551
1552 if (impersonate_princ) {
1553 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
1554 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
1555 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
1556 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
1557 #else
1558 ret = ENOTSUP;
1559 #endif
1560 } else {
1561 krb5_creds in_creds;
1562
1563 ZERO_STRUCT(in_creds);
1564
1565 in_creds.client = me;
1566 in_creds.server = server;
1567
1568 ret = krb5_get_credentials(context, 0, ccache,
1569 &in_creds, &creds);
1570 }
1571 if (ret) {
1572 goto done;
1573 }
1574
1575 if (out_creds) {
1576 *out_creds = creds;
1577 }
1578
1579 done:
1580 if (creds && ret) {
1581 krb5_free_creds(context, creds);
1582 }
1583
1584 return ret;
1585 }
1586
1587 krb5_error_code smb_krb5_keyblock_init_contents(krb5_context context,
1588 krb5_enctype enctype,
1589 const void *data,
1590 size_t length,
1591 krb5_keyblock *key)
1592 {
1593 #if defined(HAVE_KRB5_KEYBLOCK_INIT)
1594 return krb5_keyblock_init(context, enctype, data, length, key);
1595 #else
1596 memset(key, 0, sizeof(krb5_keyblock));
1597 KRB5_KEY_DATA(key) = SMB_MALLOC(length);
1598 if (NULL == KRB5_KEY_DATA(key)) {
1599 return ENOMEM;
1600 }
1601 memcpy(KRB5_KEY_DATA(key), data, length);
1602 KRB5_KEY_LENGTH(key) = length;
1603 KRB5_KEY_TYPE(key) = enctype;
1604 return 0;
1605 #endif
1606 }
1607
1608 /*
1609 simulate a kinit, putting the tgt in the given credentials cache.
1610 Orignally by remus@snapserver.com
1611
1612 This version is built to use a keyblock, rather than needing the
1613 original password.
1614
1615 The impersonate_principal is the principal if NULL, or the principal
1616 to impersonate
1617
1618 The target_service defaults to the krbtgt if NULL, but could be
1619 kpasswd/realm or the local service (if we are doing s4u2self)
1620 */
1621 krb5_error_code kerberos_kinit_keyblock_cc(krb5_context ctx, krb5_ccache cc,
1622 krb5_principal principal,
1623 krb5_keyblock *keyblock,
1624 const char *target_service,
1625 krb5_get_init_creds_opt *krb_options,
1626 time_t *expire_time,
1627 time_t *kdc_time)
1628 {
1629 krb5_error_code code = 0;
1630 krb5_creds my_creds;
1631
1632 #if defined(HAVE_KRB5_GET_INIT_CREDS_KEYBLOCK)
1633 code = krb5_get_init_creds_keyblock(ctx, &my_creds, principal,
1634 keyblock, 0, target_service,
1635 krb_options);
1636 #elif defined(HAVE_KRB5_GET_INIT_CREDS_KEYTAB)
1637 {
1638 #define SMB_CREDS_KEYTAB "MEMORY:tmp_smb_creds_XXXXXX"
1639 char tmp_name[sizeof(SMB_CREDS_KEYTAB)];
1640 krb5_keytab_entry entry;
1641 krb5_keytab keytab;
1642 mode_t mask;
1643
1644 memset(&entry, 0, sizeof(entry));
1645 entry.principal = principal;
1646 *(KRB5_KT_KEY(&entry)) = *keyblock;
1647
1648 memcpy(tmp_name, SMB_CREDS_KEYTAB, sizeof(SMB_CREDS_KEYTAB));
1649 mask = umask(S_IRWXO | S_IRWXG);
1650 mktemp(tmp_name);
1651 umask(mask);
1652 if (tmp_name[0] == 0) {
1653 return KRB5_KT_BADNAME;
1654 }
1655 code = krb5_kt_resolve(ctx, tmp_name, &keytab);
1656 if (code) {
1657 return code;
1658 }
1659
1660 code = krb5_kt_add_entry(ctx, keytab, &entry);
1661 if (code) {
1662 (void)krb5_kt_close(ctx, keytab);
1663 goto done;
1664 }
1665
1666 code = krb5_get_init_creds_keytab(ctx, &my_creds, principal,
1667 keytab, 0, target_service,
1668 krb_options);
1669 (void)krb5_kt_close(ctx, keytab);
1670 }
1671 #else
1672 #error krb5_get_init_creds_keyblock not available!
1673 #endif
1674 if (code) {
1675 return code;
1676 }
1677
1678 code = krb5_cc_initialize(ctx, cc, principal);
1679 if (code) {
1680 goto done;
1681 }
1682
1683 code = krb5_cc_store_cred(ctx, cc, &my_creds);
1684 if (code) {
1685 goto done;
1686 }
1687
1688 if (expire_time) {
1689 *expire_time = (time_t) my_creds.times.endtime;
1690 }
1691
1692 if (kdc_time) {
1693 *kdc_time = (time_t) my_creds.times.starttime;
1694 }
1695
1696 code = 0;
1697 done:
1698 krb5_free_cred_contents(ctx, &my_creds);
1699 return code;
1700 }
1701
1702 krb5_error_code kerberos_kinit_password_cc(krb5_context ctx, krb5_ccache cc,
1703 krb5_principal principal,
1704 const char *password,
1705 const char *target_service,
1706 krb5_get_init_creds_opt *krb_options,
1707 time_t *expire_time,
1708 time_t *kdc_time)
1709 {
1710 krb5_error_code code = 0;
1711 krb5_creds my_creds;
1712
1713 code = krb5_get_init_creds_password(ctx, &my_creds, principal,
1714 password, NULL, NULL, 0,
1715 target_service, krb_options);
1716 if (code) {
1717 return code;
1718 }
1719
1720 code = krb5_cc_initialize(ctx, cc, principal);
1721 if (code) {
1722 goto done;
1723 }
1724
1725 code = krb5_cc_store_cred(ctx, cc, &my_creds);
1726 if (code) {
1727 goto done;
1728 }
1729
1730 if (expire_time) {
1731 *expire_time = (time_t) my_creds.times.endtime;
1732 }
1733
1734 if (kdc_time) {
1735 *kdc_time = (time_t) my_creds.times.starttime;
1736 }
1737
1738 code = 0;
1739 done:
1740 krb5_free_cred_contents(ctx, &my_creds);
1741 return code;
1742 }
1743
1744 #ifdef SAMBA4_USES_HEIMDAL
1745 /*
1746 simulate a kinit, putting the tgt in the given credentials cache.
1747 Orignally by remus@snapserver.com
1748
1749 The impersonate_principal is the principal
1750
1751 The self_service, should be the local service (for S4U2Self if
1752 impersonate_principal is given).
1753
1754 The target_service defaults to the krbtgt if NULL, but could be
1755 kpasswd/realm or a remote service (for S4U2Proxy)
1756
1757 */
1758 krb5_error_code kerberos_kinit_s4u2_cc(krb5_context ctx,
1759 krb5_ccache store_cc,
1760 krb5_principal init_principal,
1761 const char *init_password,
1762 krb5_principal impersonate_principal,
1763 const char *self_service,
1764 const char *target_service,
1765 krb5_get_init_creds_opt *krb_options,
1766 time_t *expire_time,
1767 time_t *kdc_time)
1768 {
1769 krb5_error_code code = 0;
1770 krb5_get_creds_opt options;
1771 krb5_principal store_principal;
1772 krb5_creds store_creds;
1773 krb5_creds *s4u2self_creds;
1774 Ticket s4u2self_ticket;
1775 size_t s4u2self_ticketlen;
1776 krb5_creds *s4u2proxy_creds;
1777 krb5_principal self_princ;
1778 bool s4u2proxy;
1779 krb5_principal target_princ;
1780 krb5_ccache tmp_cc;
1781 const char *self_realm;
1782 krb5_principal blacklist_principal = NULL;
1783 krb5_principal whitelist_principal = NULL;
1784
1785 code = krb5_get_init_creds_password(ctx, &store_creds,
1786 init_principal,
1787 init_password,
1788 NULL, NULL,
1789 0,
1790 NULL,
1791 krb_options);
1792 if (code != 0) {
1793 return code;
1794 }
1795
1796 store_principal = init_principal;
1797
1798 /*
1799 * We are trying S4U2Self now:
1800 *
1801 * As we do not want to expose our TGT in the
1802 * krb5_ccache, which is also holds the impersonated creds.
1803 *
1804 * Some low level krb5/gssapi function might use the TGT
1805 * identity and let the client act as our machine account.
1806 *
1807 * We need to avoid that and use a temporary krb5_ccache
1808 * in order to pass our TGT to the krb5_get_creds() function.
1809 */
1810 code = krb5_cc_new_unique(ctx, NULL, NULL, &tmp_cc);
1811 if (code != 0) {
1812 krb5_free_cred_contents(ctx, &store_creds);
1813 return code;
1814 }
1815
1816 code = krb5_cc_initialize(ctx, tmp_cc, store_creds.client);
1817 if (code != 0) {
1818 krb5_cc_destroy(ctx, tmp_cc);
1819 krb5_free_cred_contents(ctx, &store_creds);
1820 return code;
1821 }
1822
1823 code = krb5_cc_store_cred(ctx, tmp_cc, &store_creds);
1824 if (code != 0) {
1825 krb5_free_cred_contents(ctx, &store_creds);
1826 krb5_cc_destroy(ctx, tmp_cc);
1827 return code;
1828 }
1829
1830 /*
1831 * we need to remember the client principal of our
1832 * TGT and make sure the KDC does not return this
1833 * in the impersonated tickets. This can happen
1834 * if the KDC does not support S4U2Self and S4U2Proxy.
1835 */
1836 blacklist_principal = store_creds.client;
1837 store_creds.client = NULL;
1838 krb5_free_cred_contents(ctx, &store_creds);
1839
1840 /*
1841 * Check if we also need S4U2Proxy or if S4U2Self is
1842 * enough in order to get a ticket for the target.
1843 */
1844 if (target_service == NULL) {
1845 s4u2proxy = false;
1846 } else if (strcmp(target_service, self_service) == 0) {
1847 s4u2proxy = false;
1848 } else {
1849 s4u2proxy = true;
1850 }
1851
1852 /*
1853 * For S4U2Self we need our own service principal,
1854 * which belongs to our own realm (available on
1855 * our client principal).
1856 */
1857 self_realm = krb5_principal_get_realm(ctx, init_principal);
1858
1859 code = krb5_parse_name(ctx, self_service, &self_princ);
1860 if (code != 0) {
1861 krb5_free_principal(ctx, blacklist_principal);
1862 krb5_cc_destroy(ctx, tmp_cc);
1863 return code;
1864 }
1865
1866 code = krb5_principal_set_realm(ctx, self_princ, self_realm);
1867 if (code != 0) {
1868 krb5_free_principal(ctx, blacklist_principal);
1869 krb5_free_principal(ctx, self_princ);
1870 krb5_cc_destroy(ctx, tmp_cc);
1871 return code;
1872 }
1873
1874 code = krb5_get_creds_opt_alloc(ctx, &options);
1875 if (code != 0) {
1876 krb5_free_principal(ctx, blacklist_principal);
1877 krb5_free_principal(ctx, self_princ);
1878 krb5_cc_destroy(ctx, tmp_cc);
1879 return code;
1880 }
1881
1882 if (s4u2proxy) {
1883 /*
1884 * If we want S4U2Proxy, we need the forwardable flag
1885 * on the S4U2Self ticket.
1886 */
1887 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
1888 }
1889
1890 code = krb5_get_creds_opt_set_impersonate(ctx, options,
1891 impersonate_principal);
1892 if (code != 0) {
1893 krb5_get_creds_opt_free(ctx, options);
1894 krb5_free_principal(ctx, blacklist_principal);
1895 krb5_free_principal(ctx, self_princ);
1896 krb5_cc_destroy(ctx, tmp_cc);
1897 return code;
1898 }
1899
1900 code = krb5_get_creds(ctx, options, tmp_cc,
1901 self_princ, &s4u2self_creds);
1902 krb5_get_creds_opt_free(ctx, options);
1903 krb5_free_principal(ctx, self_princ);
1904 if (code != 0) {
1905 krb5_free_principal(ctx, blacklist_principal);
1906 krb5_cc_destroy(ctx, tmp_cc);
1907 return code;
1908 }
1909
1910 if (!s4u2proxy) {
1911 krb5_cc_destroy(ctx, tmp_cc);
1912
1913 /*
1914 * Now make sure we store the impersonated principal
1915 * and creds instead of the TGT related stuff
1916 * in the krb5_ccache of the caller.
1917 */
1918 code = krb5_copy_creds_contents(ctx, s4u2self_creds,
1919 &store_creds);
1920 krb5_free_creds(ctx, s4u2self_creds);
1921 if (code != 0) {
1922 return code;
1923 }
1924
1925 /*
1926 * It's important to store the principal the KDC
1927 * returned, as otherwise the caller would not find
1928 * the S4U2Self ticket in the krb5_ccache lookup.
1929 */
1930 store_principal = store_creds.client;
1931 goto store;
1932 }
1933
1934 /*
1935 * We are trying S4U2Proxy:
1936 *
1937 * We need the ticket from the S4U2Self step
1938 * and our TGT in order to get the delegated ticket.
1939 */
1940 code = decode_Ticket((const uint8_t *)s4u2self_creds->ticket.data,
1941 s4u2self_creds->ticket.length,
1942 &s4u2self_ticket,
1943 &s4u2self_ticketlen);
1944 if (code != 0) {
1945 krb5_free_creds(ctx, s4u2self_creds);
1946 krb5_free_principal(ctx, blacklist_principal);
1947 krb5_cc_destroy(ctx, tmp_cc);
1948 return code;
1949 }
1950
1951 /*
1952 * we need to remember the client principal of the
1953 * S4U2Self stage and as it needs to match the one we
1954 * will get for the S4U2Proxy stage. We need this
1955 * in order to detect KDCs which does not support S4U2Proxy.
1956 */
1957 whitelist_principal = s4u2self_creds->client;
1958 s4u2self_creds->client = NULL;
1959 krb5_free_creds(ctx, s4u2self_creds);
1960
1961 /*
1962 * For S4U2Proxy we also got a target service principal,
1963 * which also belongs to our own realm (available on
1964 * our client principal).
1965 */
1966 code = krb5_parse_name(ctx, target_service, &target_princ);
1967 if (code != 0) {
1968 free_Ticket(&s4u2self_ticket);
1969 krb5_free_principal(ctx, whitelist_principal);
1970 krb5_free_principal(ctx, blacklist_principal);
1971 krb5_cc_destroy(ctx, tmp_cc);
1972 return code;
1973 }
1974
1975 code = krb5_principal_set_realm(ctx, target_princ, self_realm);
1976 if (code != 0) {
1977 free_Ticket(&s4u2self_ticket);
1978 krb5_free_principal(ctx, target_princ);
1979 krb5_free_principal(ctx, whitelist_principal);
1980 krb5_free_principal(ctx, blacklist_principal);
1981 krb5_cc_destroy(ctx, tmp_cc);
1982 return code;
1983 }
1984
1985 code = krb5_get_creds_opt_alloc(ctx, &options);
1986 if (code != 0) {
1987 free_Ticket(&s4u2self_ticket);
1988 krb5_free_principal(ctx, target_princ);
1989 krb5_free_principal(ctx, whitelist_principal);
1990 krb5_free_principal(ctx, blacklist_principal);
1991 krb5_cc_destroy(ctx, tmp_cc);
1992 return code;
1993 }
1994
1995 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
1996 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_CONSTRAINED_DELEGATION);
1997
1998 code = krb5_get_creds_opt_set_ticket(ctx, options, &s4u2self_ticket);
1999 free_Ticket(&s4u2self_ticket);
2000 if (code != 0) {
2001 krb5_get_creds_opt_free(ctx, options);
2002 krb5_free_principal(ctx, target_princ);
2003 krb5_free_principal(ctx, whitelist_principal);
2004 krb5_free_principal(ctx, blacklist_principal);
2005 krb5_cc_destroy(ctx, tmp_cc);
2006 return code;
2007 }
2008
2009 code = krb5_get_creds(ctx, options, tmp_cc,
2010 target_princ, &s4u2proxy_creds);
2011 krb5_get_creds_opt_free(ctx, options);
2012 krb5_free_principal(ctx, target_princ);
2013 krb5_cc_destroy(ctx, tmp_cc);
2014 if (code != 0) {
2015 krb5_free_principal(ctx, whitelist_principal);
2016 krb5_free_principal(ctx, blacklist_principal);
2017 return code;
2018 }
2019
2020 /*
2021 * Now make sure we store the impersonated principal
2022 * and creds instead of the TGT related stuff
2023 * in the krb5_ccache of the caller.
2024 */
2025 code = krb5_copy_creds_contents(ctx, s4u2proxy_creds,
2026 &store_creds);
2027 krb5_free_creds(ctx, s4u2proxy_creds);
2028 if (code != 0) {
2029 krb5_free_principal(ctx, whitelist_principal);
2030 krb5_free_principal(ctx, blacklist_principal);
2031 return code;
2032 }
2033
2034 /*
2035 * It's important to store the principal the KDC
2036 * returned, as otherwise the caller would not find
2037 * the S4U2Self ticket in the krb5_ccache lookup.
2038 */
2039 store_principal = store_creds.client;
2040
2041 store:
2042 if (blacklist_principal &&
2043 krb5_principal_compare(ctx, store_creds.client, blacklist_principal)) {
2044 char *sp = NULL;
2045 char *ip = NULL;
2046
2047 code = krb5_unparse_name(ctx, blacklist_principal, &sp);
2048 if (code != 0) {
2049 sp = NULL;
2050 }
2051 code = krb5_unparse_name(ctx, impersonate_principal, &ip);
2052 if (code != 0) {
2053 ip = NULL;
2054 }
2055 DEBUG(1, ("kerberos_kinit_password_cc: "
2056 "KDC returned self principal[%s] while impersonating [%s]\n",
2057 sp?sp:"<no memory>",
2058 ip?ip:"<no memory>"));
2059
2060 SAFE_FREE(sp);
2061 SAFE_FREE(ip);
2062
2063 krb5_free_principal(ctx, whitelist_principal);
2064 krb5_free_principal(ctx, blacklist_principal);
2065 krb5_free_cred_contents(ctx, &store_creds);
2066 return KRB5_FWD_BAD_PRINCIPAL;
2067 }
2068 if (blacklist_principal) {
2069 krb5_free_principal(ctx, blacklist_principal);
2070 }
2071
2072 if (whitelist_principal &&
2073 !krb5_principal_compare(ctx, store_creds.client, whitelist_principal)) {
2074 char *sp = NULL;
2075 char *ep = NULL;
2076
2077 code = krb5_unparse_name(ctx, store_creds.client, &sp);
2078 if (code != 0) {
2079 sp = NULL;
2080 }
2081 code = krb5_unparse_name(ctx, whitelist_principal, &ep);
2082 if (code != 0) {
2083 ep = NULL;
2084 }
2085 DEBUG(1, ("kerberos_kinit_password_cc: "
2086 "KDC returned wrong principal[%s] we expected [%s]\n",
2087 sp?sp:"<no memory>",
2088 ep?ep:"<no memory>"));
2089
2090 SAFE_FREE(sp);
2091 SAFE_FREE(ep);
2092
2093 krb5_free_principal(ctx, whitelist_principal);
2094 krb5_free_cred_contents(ctx, &store_creds);
2095 return KRB5_FWD_BAD_PRINCIPAL;
2096 }
2097 if (whitelist_principal) {
2098 krb5_free_principal(ctx, whitelist_principal);
2099 }
2100
2101 code = krb5_cc_initialize(ctx, store_cc, store_principal);
2102 if (code != 0) {
2103 krb5_free_cred_contents(ctx, &store_creds);
2104 return code;
2105 }
2106
2107 code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
2108 if (code != 0) {
2109 krb5_free_cred_contents(ctx, &store_creds);
2110 return code;
2111 }
2112
2113 if (expire_time) {
2114 *expire_time = (time_t) store_creds.times.endtime;
2115 }
2116
2117 if (kdc_time) {
2118 *kdc_time = (time_t) store_creds.times.starttime;
2119 }
2120
2121 krb5_free_cred_contents(ctx, &store_creds);
2122
2123 return 0;
2124 }
2125 #endif
2126
2127 #if !defined(HAVE_KRB5_MAKE_PRINCIPAL) && defined(HAVE_KRB5_BUILD_PRINCIPAL_ALLOC_VA)
2128 krb5_error_code smb_krb5_make_principal(krb5_context context,
2129 krb5_principal *principal,
2130 const char *_realm, ...)
2131 {
2132 krb5_error_code code;
2133 bool free_realm;
2134 char *realm;
2135 va_list ap;
2136
2137 if (_realm) {
2138 realm = _realm;
2139 free_realm = false;
2140 } else {
2141 code = krb5_get_default_realm(context, &realm);
2142 if (code) {
2143 return code;
2144 }
2145 free_realm = true;
2146 }
2147
2148 va_start(ap, _realm);
2149 code = krb5_build_principal_alloc_va(context, principal,
2150 strlen(realm), realm,
2151 ap);
2152 va_end(ap);
2153
2154 if (free_realm) {
2155 krb5_free_default_realm(context, realm);
2156 }
2157
2158 return code;
2159 }
2160 #endif
2161
2162 #if !defined(HAVE_KRB5_CC_GET_LIFETIME) && defined(HAVE_KRB5_CC_RETRIEVE_CRED)
2163 /**
2164 * @brief Get the lifetime of the initial ticket in the cache.
2165 *
2166 * @param[in] context The kerberos context.
2167 *
2168 * @param[in] id The credential cache to get the ticket lifetime.
2169 *
2170 * @param[out] t A pointer to a time value to store the lifetime.
2171 *
2172 * @return 0 on success, a krb5_error_code on error.
2173 */
2174 krb5_error_code smb_krb5_cc_get_lifetime(krb5_context context,
2175 krb5_ccache id,
2176 time_t *t)
2177 {
2178 krb5_cc_cursor cursor;
2179 krb5_error_code kerr;
2180 krb5_creds cred;
2181 krb5_timestamp now;
2182
2183 *t = 0;
2184
2185 kerr = krb5_timeofday(context, &now);
2186 if (kerr) {
2187 return kerr;
2188 }
2189
2190 kerr = krb5_cc_start_seq_get(context, id, &cursor);
2191 if (kerr) {
2192 return kerr;
2193 }
2194
2195 while ((kerr = krb5_cc_next_cred(context, id, &cursor, &cred)) == 0) {
2196 #ifndef HAVE_FLAGS_IN_KRB5_CREDS
2197 if (cred.ticket_flags & TKT_FLG_INITIAL) {
2198 #else
2199 if (cred.flags.b.initial) {
2200 #endif
2201 if (now < cred.times.endtime) {
2202 *t = (time_t) (cred.times.endtime - now);
2203 }
2204 krb5_free_cred_contents(context, &cred);
2205 break;
2206 }
2207 krb5_free_cred_contents(context, &cred);
2208 }
2209
2210 krb5_cc_end_seq_get(context, id, &cursor);
2211
2212 return kerr;
2213 }
2214 #endif /* HAVE_KRB5_CC_GET_LIFETIME */
2215
2216 #if !defined(HAVE_KRB5_FREE_CHECKSUM_CONTENTS) && defined(HAVE_FREE_CHECKSUM)
2217 void smb_krb5_free_checksum_contents(krb5_context ctx, krb5_checksum *cksum)
2218 {
2219 free_Checksum(cksum);
2220 }
2221 #endif
2222
2223 krb5_error_code smb_krb5_make_pac_checksum(TALLOC_CTX *mem_ctx,
2224 DATA_BLOB *pac_data,
2225 krb5_context context,
2226 const krb5_keyblock *keyblock,
2227 uint32_t *sig_type,
2228 DATA_BLOB *sig_blob)
2229 {
2230 krb5_error_code ret;
2231 krb5_checksum cksum;
2232 #if defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CREATE_CHECKSUM)
2233 krb5_crypto crypto;
2234
2235
2236 ret = krb5_crypto_init(context,
2237 keyblock,
2238 0,
2239 &crypto);
2240 if (ret) {
2241 DEBUG(0,("krb5_crypto_init() failed: %s\n",
2242 smb_get_krb5_error_message(context, ret, mem_ctx)));
2243 return ret;
2244 }
2245 ret = krb5_create_checksum(context,
2246 crypto,
2247 KRB5_KU_OTHER_CKSUM,
2248 0,
2249 pac_data->data,
2250 pac_data->length,
2251 &cksum);
2252 if (ret) {
2253 DEBUG(2, ("PAC Verification failed: %s\n",
2254 smb_get_krb5_error_message(context, ret, mem_ctx)));
2255 }
2256
2257 krb5_crypto_destroy(context, crypto);
2258
2259 if (ret) {
2260 return ret;
2261 }
2262
2263 *sig_type = cksum.cksumtype;
2264 *sig_blob = data_blob_talloc(mem_ctx,
2265 cksum.checksum.data,
2266 cksum.checksum.length);
2267 #elif defined(HAVE_KRB5_C_MAKE_CHECKSUM)
2268 krb5_data input;
2269
2270 input.data = (char *)pac_data->data;
2271 input.length = pac_data->length;
2272
2273 ret = krb5_c_make_checksum(context,
2274 0,
2275 keyblock,
2276 KRB5_KEYUSAGE_APP_DATA_CKSUM,
2277 &input,
2278 &cksum);
2279 if (ret) {
2280 DEBUG(2, ("PAC Verification failed: %s\n",
2281 smb_get_krb5_error_message(context, ret, mem_ctx)));
2282 return ret;
2283 }
2284
2285 *sig_type = cksum.checksum_type;
2286 *sig_blob = data_blob_talloc(mem_ctx,
2287 cksum.contents,
2288 cksum.length);
2289
2290 #else
2291 #error krb5_create_checksum or krb5_c_make_checksum not available
2292 #endif /* HAVE_KRB5_C_MAKE_CHECKSUM */
2293 smb_krb5_free_checksum_contents(context, &cksum);
2294
2295 return 0;
2296 }
2297
2298
2299 /*
2300 * smb_krb5_principal_get_realm
2301 *
2302 * @brief Get realm of a principal
2303 *
2304 * @param[in] context The krb5_context
2305 * @param[in] principal The principal
2306 * @return pointer to the realm
2307 *
2308 * Caller must free if the return value is not NULL.
2309 *
2310 */
2311
2312 char *smb_krb5_principal_get_realm(krb5_context context,
2313 krb5_const_principal principal)
2314 {
2315 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2316 return strdup(discard_const_p(char, krb5_principal_get_realm(context, principal)));
2317 #elif defined(krb5_princ_realm) /* MIT */
2318 krb5_data *realm;
2319 realm = krb5_princ_realm(context, principal);
2320 return strndup(realm->data, realm->length);
2321 #else
2322 #error UNKNOWN_GET_PRINC_REALM_FUNCTIONS
2323 #endif
2324 }
2325
2326 /*
2327 * smb_krb5_principal_set_realm
2328 *
2329 * @brief Get realm of a principal
2330 *
2331 * @param[in] context The krb5_context
2332 * @param[in] principal The principal
2333 * @param[in] realm The realm
2334 * @return 0 on success, a krb5_error_code on error.
2335 *
2336 */
2337
2338 krb5_error_code smb_krb5_principal_set_realm(krb5_context context,
2339 krb5_principal principal,
2340 const char *realm)
2341 {
2342 #ifdef HAVE_KRB5_PRINCIPAL_SET_REALM /* Heimdal */
2343 return krb5_principal_set_realm(context, principal, realm);
2344 #elif defined(krb5_princ_realm) && defined(krb5_princ_set_realm) /* MIT */
2345 krb5_error_code ret;
2346 krb5_data data;
2347 krb5_data *old_data;
2348
2349 old_data = krb5_princ_realm(context, principal);
2350
2351 ret = krb5_copy_data_contents(&data,
2352 realm,
2353 strlen(realm));
2354 if (ret) {
2355 return ret;
2356 }
2357
2358 /* free realm before setting */
2359 free(old_data->data);
2360
2361 krb5_princ_set_realm(context, principal, &data);
2362
2363 return ret;
2364 #else
2365 #error UNKNOWN_PRINC_SET_REALM_FUNCTION
2366 #endif
2367 }
2368
2369
2370 /************************************************************************
2371 Routine to get the default realm from the kerberos credentials cache.
2372 Caller must free if the return value is not NULL.
2373 ************************************************************************/
2374
2375 static char *smb_krb5_get_default_realm_from_ccache(TALLOC_CTX *mem_ctx)
2376 {
2377 char *realm = NULL;
2378 krb5_context ctx = NULL;
2379 krb5_ccache cc = NULL;
2380 krb5_principal princ = NULL;
2381
2382 initialize_krb5_error_table();
2383 if (krb5_init_context(&ctx)) {
2384 return NULL;
2385 }
2386
2387 DEBUG(5,("kerberos_get_default_realm_from_ccache: "
2388 "Trying to read krb5 cache: %s\n",
2389 krb5_cc_default_name(ctx)));
2390 if (krb5_cc_default(ctx, &cc)) {
2391 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
2392 "failed to read default cache\n"));
2393 goto out;
2394 }
2395 if (krb5_cc_get_principal(ctx, cc, &princ)) {
2396 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
2397 "failed to get default principal\n"));
2398 goto out;
2399 }
2400
2401 #if defined(HAVE_KRB5_PRINCIPAL_GET_REALM)
2402 realm = talloc_strdup(mem_ctx, krb5_principal_get_realm(ctx, princ));
2403 #elif defined(HAVE_KRB5_PRINC_REALM)
2404 {
2405 krb5_data *realm_data = krb5_princ_realm(ctx, princ);
2406 realm = talloc_strndup(mem_ctx, realm_data->data, realm_data->length);
2407 }
2408 #endif
2409
2410 out:
2411
2412 if (ctx) {
2413 if (princ) {
2414 krb5_free_principal(ctx, princ);
2415 }
2416 if (cc) {
2417 krb5_cc_close(ctx, cc);
2418 }
2419 krb5_free_context(ctx);
2420 }
2421
2422 return realm;
2423 }
2424
2425 /************************************************************************
2426 Routine to get the realm from a given DNS name.
2427 ************************************************************************/
2428
2429 static char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
2430 const char *hostname)
2431 {
2432 #if defined(HAVE_KRB5_REALM_TYPE)
2433 /* Heimdal. */
2434 krb5_realm *realm_list = NULL;
2435 #else
2436 /* MIT */
2437 char **realm_list = NULL;
2438 #endif
2439 char *realm = NULL;
2440 krb5_error_code kerr;
2441 krb5_context ctx = NULL;
2442
2443 initialize_krb5_error_table();
2444 if (krb5_init_context(&ctx)) {
2445 return NULL;
2446 }
2447
2448 kerr = krb5_get_host_realm(ctx, hostname, &realm_list);
2449 if (kerr != 0) {
2450 DEBUG(3,("kerberos_get_realm_from_hostname %s: "
2451 "failed %s\n",
2452 hostname ? hostname : "(NULL)",
2453 error_message(kerr) ));
2454 goto out;
2455 }
2456
2457 if (realm_list && realm_list[0]) {
2458 realm = talloc_strdup(mem_ctx, realm_list[0]);
2459 }
2460
2461 out:
2462
2463 if (ctx) {
2464 if (realm_list) {
2465 krb5_free_host_realm(ctx, realm_list);
2466 realm_list = NULL;
2467 }
2468 krb5_free_context(ctx);
2469 ctx = NULL;
2470 }
2471 return realm;
2472 }
2473
2474 char *kerberos_get_principal_from_service_hostname(TALLOC_CTX *mem_ctx,
2475 const char *service,
2476 const char *remote_name,
2477 const char *default_realm)
2478 {
2479 char *realm = NULL;
2480 char *host = NULL;
2481 char *principal;
2482 host = strchr_m(remote_name, '.');
2483 if (host) {
2484 /* DNS name. */
2485 realm = smb_krb5_get_realm_from_hostname(talloc_tos(),
2486 remote_name);
2487 } else {
2488 /* NetBIOS name - use our realm. */
2489 realm = smb_krb5_get_default_realm_from_ccache(talloc_tos());
2490 }
2491
2492 if (realm == NULL || *realm == '\0') {
2493 realm = talloc_strdup(talloc_tos(), default_realm);
2494 if (!realm) {
2495 return NULL;
2496 }
2497 DEBUG(3,("kerberos_get_principal_from_service_hostname: "
2498 "cannot get realm from, "
2499 "desthost %s or default ccache. Using default "
2500 "smb.conf realm %s\n",
2501 remote_name,
2502 realm));
2503 }
2504
2505 principal = talloc_asprintf(mem_ctx,
2506 "%s/%s@%s",
2507 service, remote_name,
2508 realm);
2509 TALLOC_FREE(realm);
2510 return principal;
2511 }
2512
2513 char *smb_get_krb5_error_message(krb5_context context,
2514 krb5_error_code code,
2515 TALLOC_CTX *mem_ctx)
2516 {
2517 char *ret;
2518
2519 #if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
2520 const char *context_error = krb5_get_error_message(context, code);
2521 if (context_error) {
2522 ret = talloc_asprintf(mem_ctx, "%s: %s",
2523 error_message(code), context_error);
2524 krb5_free_error_message(context, context_error);
2525 return ret;
2526 }
2527 #endif
2528 ret = talloc_strdup(mem_ctx, error_message(code));
2529 return ret;
2530 }
2531
2532
2533 /**
2534 * @brief Return the kerberos library setting for "libdefaults:allow_weak_crypto"
2535 *
2536 * @param context The krb5_context
2537 *
2538 * @return krb5_boolean
2539 *
2540 * Function returns true if weak crypto is allowd, false if not
2541 */
2542
2543 krb5_boolean smb_krb5_get_allowed_weak_crypto(krb5_context context)
2544 #if defined(HAVE_KRB5_CONFIG_GET_BOOL_DEFAULT)
2545 {
2546 return krb5_config_get_bool_default(context,
2547 NULL,
2548 FALSE,
2549 "libdefaults",
2550 "allow_weak_crypto",
2551 NULL);
2552 }
2553 #elif defined(HAVE_PROFILE_H) && defined(HAVE_KRB5_GET_PROFILE)
2554 {
2555 #include <profile.h>
2556 krb5_error_code ret;
2557 krb5_boolean ret_default = false;
2558 profile_t profile;
2559 int ret_profile;
2560
2561 ret = krb5_get_profile(context,
2562 &profile);
2563 if (ret) {
2564 return ret_default;
2565 }
2566
2567 ret = profile_get_boolean(profile,
2568 "libdefaults",
2569 "allow_weak_crypto",
2570 NULL, /* subsubname */
2571 ret_default, /* def_val */
2572 &ret_profile /* *ret_default */);
2573 if (ret) {
2574 return ret_default;
2575 }
2576
2577 profile_release(profile);
2578
2579 return ret_profile;
2580 }
2581 #else
2582 #error UNKNOWN_KRB5_CONFIG_ROUTINES
2583 #endif
2584
2585 /**
2586 * @brief Return the type of a krb5_principal
2587 *
2588 * @param context The krb5_context
2589 * @param principal The const krb5_principal
2590 *
2591 * @return integer type of the principal
2592 */
2593 int smb_krb5_principal_get_type(krb5_context context,
2594 krb5_const_principal principal)
2595 {
2596 #ifdef HAVE_KRB5_PRINCIPAL_GET_TYPE /* Heimdal */
2597 return krb5_principal_get_type(context, principal);
2598 #elif defined(krb5_princ_type) /* MIT */
2599 return krb5_princ_type(context, principal);
2600 #else
2601 #error UNKNOWN_PRINC_GET_TYPE_FUNCTION
2602 #endif
2603 }
2604
2605 /**
2606 * @brief Generate a krb5 warning, forwarding to com_err
2607 *
2608 * @param context The krb5_context
2609 * @param fmt The message format
2610 * @param ... The message arguments
2611 *
2612 * @return
2613 */
2614 #if !defined(HAVE_KRB5_WARNX)
2615 krb5_error_code krb5_warnx(krb5_context context, const char *fmt, ...)
2616 {
2617 va_list args;
2618
2619 va_start(args, fmt);
2620 com_err_va("kdb_samba", errno, fmt, args);
2621 va_end(args);
2622
2623 return 0;
2624 }
2625 #endif
2626
2627 #else /* HAVE_KRB5 */
2628 /* this saves a few linking headaches */
2629 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
2630 const char *principal, time_t time_offset,
2631 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
2632 uint32_t extra_ap_opts,
2633 const char *ccname, time_t *tgs_expire,
2634 const char *impersonate_princ_s)
2635 {
2636 DEBUG(0,("NO KERBEROS SUPPORT\n"));
2637 return 1;
2638 }
2639
2640 #endif /* HAVE_KRB5 */
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