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lib/replace: split out GSSAPI from lib/replace/system/kerberos.h into lib/replace...
[Samba.git] / lib / krb5_wrap / krb5_samba.c
blob10207b58bc4e47ebafc945db6db9e3cd565955cf
1 /*
2 Unix SMB/CIFS implementation.
3 simple kerberos5 routines for active directory
4 Copyright (C) Andrew Tridgell 2001
5 Copyright (C) Luke Howard 2002-2003
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
7 Copyright (C) Guenther Deschner 2005-2009
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 */
22
23 #include "includes.h"
24 #include "krb5_samba.h"
25 #include "librpc/gen_ndr/krb5pac.h"
26 #include "lib/util/asn1.h"
27
28 #ifndef KRB5_AUTHDATA_WIN2K_PAC
29 #define KRB5_AUTHDATA_WIN2K_PAC 128
30 #endif
31
32 #ifndef KRB5_AUTHDATA_IF_RELEVANT
33 #define KRB5_AUTHDATA_IF_RELEVANT 1
34 #endif
35
36 #ifdef HAVE_KRB5
37
38 #define GSSAPI_CHECKSUM 0x8003 /* Checksum type value for Kerberos */
39 #define GSSAPI_BNDLENGTH 16 /* Bind Length (rfc-1964 pg.3) */
40 #define GSSAPI_CHECKSUM_SIZE (4+GSSAPI_BNDLENGTH+4) /* Length of bind length,
41 bind field, flags field. */
42 #define GSS_C_DELEG_FLAG 1
43
44 /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
45 but still has the symbol */
46 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
47 krb5_error_code krb5_auth_con_set_req_cksumtype(
48 krb5_context context,
49 krb5_auth_context auth_context,
50 krb5_cksumtype cksumtype);
51 #endif
52
53 #if !defined(SMB_MALLOC)
54 #undef malloc
55 #define SMB_MALLOC(s) malloc((s))
56 #endif
57
58 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
59
60 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
61
62 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
63 * to krb5_set_default_tgs_ktypes. See
64 * http://lists.samba.org/archive/samba-technical/2006-July/048271.html
65 *
66 * If the MIT libraries are not exporting internal symbols, we will end up in
67 * this branch, which is correct. Otherwise we will continue to use the
68 * internal symbol
69 */
70 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
71 {
72 return krb5_set_default_tgs_enctypes(ctx, enc);
73 }
74
75 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
76
77 /* Heimdal */
78 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
79 {
80 return krb5_set_default_in_tkt_etypes(ctx, enc);
81 }
82
83 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
84
85 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
86
87 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
88 /* HEIMDAL */
89 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
90 {
91 memset(pkaddr, '\0', sizeof(krb5_address));
92 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
93 if (paddr->ss_family == AF_INET6) {
94 pkaddr->addr_type = KRB5_ADDRESS_INET6;
95 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
96 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
97 return true;
98 }
99 #endif
100 if (paddr->ss_family == AF_INET) {
101 pkaddr->addr_type = KRB5_ADDRESS_INET;
102 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
103 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
104 return true;
105 }
106 return false;
107 }
108 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
109 /* MIT */
110 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
111 {
112 memset(pkaddr, '\0', sizeof(krb5_address));
113 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
114 if (paddr->ss_family == AF_INET6) {
115 pkaddr->addrtype = ADDRTYPE_INET6;
116 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
117 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
118 return true;
119 }
120 #endif
121 if (paddr->ss_family == AF_INET) {
122 pkaddr->addrtype = ADDRTYPE_INET;
123 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
124 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
125 return true;
126 }
127 return false;
128 }
129 #else
130 #error UNKNOWN_ADDRTYPE
131 #endif
132
133 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_C_STRING_TO_KEY)
134 /* MIT */
135 int create_kerberos_key_from_string_direct(krb5_context context,
136 krb5_principal host_princ,
137 krb5_data *password,
138 krb5_keyblock *key,
139 krb5_enctype enctype)
140 {
141 int ret = 0;
142 krb5_data salt;
143
144 ret = krb5_principal2salt(context, host_princ, &salt);
145 if (ret) {
146 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
147 return ret;
148 }
149 ret = krb5_c_string_to_key(context, enctype, password, &salt, key);
150 SAFE_FREE(salt.data);
151
152 return ret;
153 }
154 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
155 /* Heimdal */
156 int create_kerberos_key_from_string_direct(krb5_context context,
157 krb5_principal host_princ,
158 krb5_data *password,
159 krb5_keyblock *key,
160 krb5_enctype enctype)
161 {
162 int ret;
163 krb5_salt salt;
164
165 ret = krb5_get_pw_salt(context, host_princ, &salt);
166 if (ret) {
167 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
168 return ret;
169 }
170
171 ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
172 krb5_free_salt(context, salt);
173
174 return ret;
175 }
176 #else
177 #error UNKNOWN_CREATE_KEY_FUNCTIONS
178 #endif
179
180 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
181 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
182 krb5_enctype **enctypes)
183 {
184 return krb5_get_permitted_enctypes(context, enctypes);
185 }
186 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
187 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
188 krb5_enctype **enctypes)
189 {
190 #ifdef HAVE_KRB5_PDU_NONE_DECL
191 return krb5_get_default_in_tkt_etypes(context, KRB5_PDU_NONE, enctypes);
192 #else
193 return krb5_get_default_in_tkt_etypes(context, enctypes);
194 #endif
195 }
196 #else
197 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
198 #endif
199
200 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
201 krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
202 krb5_auth_context auth_context,
203 krb5_keyblock *keyblock)
204 {
205 return krb5_auth_con_setkey(context, auth_context, keyblock);
206 }
207 #endif
208
209 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
210 DATA_BLOB *edata,
211 DATA_BLOB *edata_out)
212 {
213 DATA_BLOB edata_contents;
214 ASN1_DATA *data;
215 int edata_type;
216
217 if (!edata->length) {
218 return false;
219 }
220
221 data = asn1_init(mem_ctx);
222 if (data == NULL) {
223 return false;
224 }
225
226 asn1_load(data, *edata);
227 asn1_start_tag(data, ASN1_SEQUENCE(0));
228 asn1_start_tag(data, ASN1_CONTEXT(1));
229 asn1_read_Integer(data, &edata_type);
230
231 if (edata_type != KRB5_PADATA_PW_SALT) {
232 DEBUG(0,("edata is not of required type %d but of type %d\n",
233 KRB5_PADATA_PW_SALT, edata_type));
234 asn1_free(data);
235 return false;
236 }
237
238 asn1_start_tag(data, ASN1_CONTEXT(2));
239 asn1_read_OctetString(data, talloc_tos(), &edata_contents);
240 asn1_end_tag(data);
241 asn1_end_tag(data);
242 asn1_end_tag(data);
243 asn1_free(data);
244
245 *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
246
247 data_blob_free(&edata_contents);
248
249 return true;
250 }
251
252
253 static bool ads_cleanup_expired_creds(krb5_context context,
254 krb5_ccache ccache,
255 krb5_creds *credsp)
256 {
257 krb5_error_code retval;
258 const char *cc_type = krb5_cc_get_type(context, ccache);
259
260 DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
261 cc_type, krb5_cc_get_name(context, ccache),
262 http_timestring(talloc_tos(), credsp->times.endtime)));
263
264 /* we will probably need new tickets if the current ones
265 will expire within 10 seconds.
266 */
267 if (credsp->times.endtime >= (time(NULL) + 10))
268 return false;
269
270 /* heimdal won't remove creds from a file ccache, and
271 perhaps we shouldn't anyway, since internally we
272 use memory ccaches, and a FILE one probably means that
273 we're using creds obtained outside of our exectuable
274 */
275 if (strequal(cc_type, "FILE")) {
276 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
277 return false;
278 }
279
280 retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
281 if (retval) {
282 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
283 error_message(retval)));
284 /* If we have an error in this, we want to display it,
285 but continue as though we deleted it */
286 }
287 return true;
288 }
289
290 /* Allocate and setup the auth context into the state we need. */
291
292 static krb5_error_code setup_auth_context(krb5_context context,
293 krb5_auth_context *auth_context)
294 {
295 krb5_error_code retval;
296
297 retval = krb5_auth_con_init(context, auth_context );
298 if (retval) {
299 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
300 error_message(retval)));
301 return retval;
302 }
303
304 /* Ensure this is an addressless ticket. */
305 retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
306 if (retval) {
307 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
308 error_message(retval)));
309 }
310
311 return retval;
312 }
313
314 #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)
315 static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
316 uint32_t gss_flags)
317 {
318 unsigned int orig_length = in_data->length;
319 unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
320 char *gss_cksum = NULL;
321
322 if (orig_length) {
323 /* Extra length field for delgated ticket. */
324 base_cksum_size += 4;
325 }
326
327 if ((unsigned int)base_cksum_size + orig_length <
328 (unsigned int)base_cksum_size) {
329 return EINVAL;
330 }
331
332 gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
333 if (gss_cksum == NULL) {
334 return ENOMEM;
335 }
336
337 memset(gss_cksum, '\0', base_cksum_size + orig_length);
338 SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
339
340 /*
341 * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
342 * This matches the behavior of heimdal and mit.
343 *
344 * And it is needed to work against some closed source
345 * SMB servers.
346 *
347 * See bug #7883
348 */
349 memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
350
351 SIVAL(gss_cksum, 20, gss_flags);
352
353 if (orig_length) {
354 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
355 SSVAL(gss_cksum, 26, orig_length);
356 /* Copy the kerberos KRB_CRED data */
357 memcpy(gss_cksum + 28, in_data->data, orig_length);
358 free(in_data->data);
359 in_data->data = NULL;
360 in_data->length = 0;
361 }
362 in_data->data = gss_cksum;
363 in_data->length = base_cksum_size + orig_length;
364 return 0;
365 }
366 #endif
367
368 /**************************************************************
369 krb5_parse_name that takes a UNIX charset.
370 **************************************************************/
371
372 krb5_error_code smb_krb5_parse_name(krb5_context context,
373 const char *name, /* in unix charset */
374 krb5_principal *principal)
375 {
376 krb5_error_code ret;
377 char *utf8_name;
378 size_t converted_size;
379 TALLOC_CTX *frame = talloc_stackframe();
380
381 if (!push_utf8_talloc(frame, &utf8_name, name, &converted_size)) {
382 talloc_free(frame);
383 return ENOMEM;
384 }
385
386 ret = krb5_parse_name(context, utf8_name, principal);
387 TALLOC_FREE(frame);
388 return ret;
389 }
390
391 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
392 void krb5_free_unparsed_name(krb5_context context, char *val)
393 {
394 SAFE_FREE(val);
395 }
396 #endif
397
398 /**************************************************************
399 krb5_parse_name that returns a UNIX charset name. Must
400 be freed with talloc_free() call.
401 **************************************************************/
402
403 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
404 krb5_context context,
405 krb5_const_principal principal,
406 char **unix_name)
407 {
408 krb5_error_code ret;
409 char *utf8_name;
410 size_t converted_size;
411
412 *unix_name = NULL;
413 ret = krb5_unparse_name(context, principal, &utf8_name);
414 if (ret) {
415 return ret;
416 }
417
418 if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
419 krb5_free_unparsed_name(context, utf8_name);
420 return ENOMEM;
421 }
422 krb5_free_unparsed_name(context, utf8_name);
423 return 0;
424 }
425
426 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
427 const char *name,
428 krb5_principal *principal)
429 {
430 /* we are cheating here because parse_name will in fact set the realm.
431 * We don't care as the only caller of smb_krb5_parse_name_norealm
432 * ignores the realm anyway when calling
433 * smb_krb5_principal_compare_any_realm later - Guenther */
434
435 return smb_krb5_parse_name(context, name, principal);
436 }
437
438 bool smb_krb5_principal_compare_any_realm(krb5_context context,
439 krb5_const_principal princ1,
440 krb5_const_principal princ2)
441 {
442 return krb5_principal_compare_any_realm(context, princ1, princ2);
443 }
444
445 /*
446 we can't use krb5_mk_req because w2k wants the service to be in a particular format
447 */
448 static krb5_error_code ads_krb5_mk_req(krb5_context context,
449 krb5_auth_context *auth_context,
450 const krb5_flags ap_req_options,
451 const char *principal,
452 krb5_ccache ccache,
453 krb5_data *outbuf,
454 time_t *expire_time,
455 const char *impersonate_princ_s)
456 {
457 krb5_error_code retval;
458 krb5_principal server;
459 krb5_principal impersonate_princ = NULL;
460 krb5_creds * credsp;
461 krb5_creds creds;
462 krb5_data in_data;
463 bool creds_ready = false;
464 int i = 0, maxtries = 3;
465
466 ZERO_STRUCT(in_data);
467
468 retval = smb_krb5_parse_name(context, principal, &server);
469 if (retval) {
470 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
471 return retval;
472 }
473
474 if (impersonate_princ_s) {
475 retval = smb_krb5_parse_name(context, impersonate_princ_s,
476 &impersonate_princ);
477 if (retval) {
478 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
479 goto cleanup_princ;
480 }
481 }
482
483 /* obtain ticket & session key */
484 ZERO_STRUCT(creds);
485 if ((retval = krb5_copy_principal(context, server, &creds.server))) {
486 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
487 error_message(retval)));
488 goto cleanup_princ;
489 }
490
491 if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
492 /* This can commonly fail on smbd startup with no ticket in the cache.
493 * Report at higher level than 1. */
494 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
495 error_message(retval)));
496 goto cleanup_creds;
497 }
498
499 while (!creds_ready && (i < maxtries)) {
500
501 if ((retval = smb_krb5_get_credentials(context, ccache,
502 creds.client,
503 creds.server,
504 impersonate_princ,
505 &credsp))) {
506 DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
507 principal, error_message(retval)));
508 goto cleanup_creds;
509 }
510
511 /* cope with ticket being in the future due to clock skew */
512 if ((unsigned)credsp->times.starttime > time(NULL)) {
513 time_t t = time(NULL);
514 int time_offset =(int)((unsigned)credsp->times.starttime-t);
515 DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
516 krb5_set_real_time(context, t + time_offset + 1, 0);
517 }
518
519 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
520 creds_ready = true;
521 }
522
523 i++;
524 }
525
526 DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
527 principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
528 http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
529 (unsigned)credsp->times.endtime));
530
531 if (expire_time) {
532 *expire_time = (time_t)credsp->times.endtime;
533 }
534
535 /* Allocate the auth_context. */
536 retval = setup_auth_context(context, auth_context);
537 if (retval) {
538 DEBUG(1,("setup_auth_context failed (%s)\n",
539 error_message(retval)));
540 goto cleanup_creds;
541 }
542
543 #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)
544 {
545 uint32_t gss_flags = 0;
546
547 if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
548 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
549 as part of the kerberos exchange. */
550
551 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n") );
552
553 retval = krb5_auth_con_setuseruserkey(context,
554 *auth_context,
555 &credsp->keyblock );
556 if (retval) {
557 DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
558 error_message(retval)));
559 goto cleanup_creds;
560 }
561
562 /* Must use a subkey for forwarded tickets. */
563 retval = krb5_auth_con_setflags(context,
564 *auth_context,
565 KRB5_AUTH_CONTEXT_USE_SUBKEY);
566 if (retval) {
567 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
568 error_message(retval)));
569 goto cleanup_creds;
570 }
571
572 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
573 *auth_context, /* Authentication context [in] */
574 discard_const_p(char, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
575 credsp->client, /* Client principal for the tgt [in] */
576 credsp->server, /* Server principal for the tgt [in] */
577 ccache, /* Credential cache to use for storage [in] */
578 1, /* Turn on for "Forwardable ticket" [in] */
579 &in_data ); /* Resulting response [out] */
580
581 if (retval) {
582 DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
583 error_message( retval ) ) );
584
585 /*
586 * This is not fatal. Delete the *auth_context and continue
587 * with krb5_mk_req_extended to get a non-forwardable ticket.
588 */
589
590 if (in_data.data) {
591 free( in_data.data );
592 in_data.data = NULL;
593 in_data.length = 0;
594 }
595 krb5_auth_con_free(context, *auth_context);
596 *auth_context = NULL;
597 retval = setup_auth_context(context, auth_context);
598 if (retval) {
599 DEBUG(1,("setup_auth_context failed (%s)\n",
600 error_message(retval)));
601 goto cleanup_creds;
602 }
603 } else {
604 /* We got a delegated ticket. */
605 gss_flags |= GSS_C_DELEG_FLAG;
606 }
607 }
608
609 /* Frees and reallocates in_data into a GSS checksum blob. */
610 retval = create_gss_checksum(&in_data, gss_flags);
611 if (retval) {
612 goto cleanup_data;
613 }
614
615 /* We always want GSS-checksum types. */
616 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
617 if (retval) {
618 DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
619 error_message(retval)));
620 goto cleanup_data;
621 }
622 }
623 #endif
624
625 retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
626 &in_data, credsp, outbuf);
627 if (retval) {
628 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
629 error_message(retval)));
630 }
631
632 #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)
633 cleanup_data:
634 #endif
635
636 if (in_data.data) {
637 free( in_data.data );
638 in_data.length = 0;
639 }
640
641 krb5_free_creds(context, credsp);
642
643 cleanup_creds:
644 krb5_free_cred_contents(context, &creds);
645
646 cleanup_princ:
647 krb5_free_principal(context, server);
648 if (impersonate_princ) {
649 krb5_free_principal(context, impersonate_princ);
650 }
651
652 return retval;
653 }
654
655 void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
656 {
657 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
658 if (pdata->data) {
659 krb5_free_data_contents(context, pdata);
660 }
661 #elif defined(HAVE_KRB5_DATA_FREE)
662 krb5_data_free(context, pdata);
663 #else
664 SAFE_FREE(pdata->data);
665 #endif
666 }
667
668 /*
669 get a kerberos5 ticket for the given service
670 */
671 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
672 const char *principal, time_t time_offset,
673 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
674 uint32_t extra_ap_opts, const char *ccname,
675 time_t *tgs_expire,
676 const char *impersonate_princ_s)
677
678 {
679 krb5_error_code retval;
680 krb5_data packet;
681 krb5_context context = NULL;
682 krb5_ccache ccdef = NULL;
683 krb5_auth_context auth_context = NULL;
684 krb5_enctype enc_types[] = {
685 ENCTYPE_ARCFOUR_HMAC,
686 ENCTYPE_DES_CBC_MD5,
687 ENCTYPE_DES_CBC_CRC,
688 ENCTYPE_NULL};
689
690 initialize_krb5_error_table();
691 retval = krb5_init_context(&context);
692 if (retval) {
693 DEBUG(1, ("krb5_init_context failed (%s)\n",
694 error_message(retval)));
695 goto failed;
696 }
697
698 if (time_offset != 0) {
699 krb5_set_real_time(context, time(NULL) + time_offset, 0);
700 }
701
702 if ((retval = krb5_cc_resolve(context, ccname ?
703 ccname : krb5_cc_default_name(context), &ccdef))) {
704 DEBUG(1, ("krb5_cc_default failed (%s)\n",
705 error_message(retval)));
706 goto failed;
707 }
708
709 if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
710 DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
711 error_message(retval)));
712 goto failed;
713 }
714
715 retval = ads_krb5_mk_req(context, &auth_context,
716 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
717 principal, ccdef, &packet,
718 tgs_expire, impersonate_princ_s);
719 if (retval) {
720 goto failed;
721 }
722
723 get_krb5_smb_session_key(mem_ctx, context, auth_context,
724 session_key_krb5, false);
725
726 *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
727
728 kerberos_free_data_contents(context, &packet);
729
730 failed:
731
732 if (context) {
733 if (ccdef)
734 krb5_cc_close(context, ccdef);
735 if (auth_context)
736 krb5_auth_con_free(context, auth_context);
737 krb5_free_context(context);
738 }
739
740 return retval;
741 }
742
743 bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
744 krb5_context context,
745 krb5_auth_context auth_context,
746 DATA_BLOB *session_key, bool remote)
747 {
748 krb5_keyblock *skey = NULL;
749 krb5_error_code err = 0;
750 bool ret = false;
751
752 if (remote) {
753 err = krb5_auth_con_getremotesubkey(context,
754 auth_context, &skey);
755 } else {
756 err = krb5_auth_con_getlocalsubkey(context,
757 auth_context, &skey);
758 }
759
760 if (err || skey == NULL) {
761 DEBUG(10, ("KRB5 error getting session key %d\n", err));
762 goto done;
763 }
764
765 DEBUG(10, ("Got KRB5 session key of length %d\n",
766 (int)KRB5_KEY_LENGTH(skey)));
767
768 *session_key = data_blob_talloc(mem_ctx,
769 KRB5_KEY_DATA(skey),
770 KRB5_KEY_LENGTH(skey));
771 dump_data_pw("KRB5 Session Key:\n",
772 session_key->data,
773 session_key->length);
774
775 ret = true;
776
777 done:
778 if (skey) {
779 krb5_free_keyblock(context, skey);
780 }
781
782 return ret;
783 }
784
785
786 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
787 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
788
789 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
790 {
791 static krb5_data kdata;
792
793 kdata.data = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i));
794 kdata.length = strlen((const char *)kdata.data);
795 return &kdata;
796 }
797 #endif
798
799 /* Prototypes */
800
801 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, /* FILE:/tmp/krb5cc_0 */
802 const char *client_string, /* gd@BER.SUSE.DE */
803 const char *service_string, /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
804 time_t *expire_time)
805 {
806 krb5_error_code ret;
807 krb5_context context = NULL;
808 krb5_ccache ccache = NULL;
809 krb5_principal client = NULL;
810 krb5_creds creds, creds_in, *creds_out = NULL;
811
812 ZERO_STRUCT(creds);
813 ZERO_STRUCT(creds_in);
814
815 initialize_krb5_error_table();
816 ret = krb5_init_context(&context);
817 if (ret) {
818 goto done;
819 }
820
821 if (!ccache_string) {
822 ccache_string = krb5_cc_default_name(context);
823 }
824
825 if (!ccache_string) {
826 ret = EINVAL;
827 goto done;
828 }
829
830 DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
831
832 /* FIXME: we should not fall back to defaults */
833 ret = krb5_cc_resolve(context, discard_const_p(char, ccache_string), &ccache);
834 if (ret) {
835 goto done;
836 }
837
838 if (client_string) {
839 ret = smb_krb5_parse_name(context, client_string, &client);
840 if (ret) {
841 goto done;
842 }
843 } else {
844 ret = krb5_cc_get_principal(context, ccache, &client);
845 if (ret) {
846 goto done;
847 }
848 }
849
850 ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string));
851 if (ret) {
852 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
853 goto done;
854 }
855
856 /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
857 ret = krb5_cc_initialize(context, ccache, client);
858 if (ret) {
859 goto done;
860 }
861
862 ret = krb5_cc_store_cred(context, ccache, &creds);
863
864 if (expire_time) {
865 *expire_time = (time_t) creds.times.endtime;
866 }
867
868 done:
869 krb5_free_cred_contents(context, &creds_in);
870
871 if (creds_out) {
872 krb5_free_creds(context, creds_out);
873 } else {
874 krb5_free_cred_contents(context, &creds);
875 }
876
877 if (client) {
878 krb5_free_principal(context, client);
879 }
880 if (ccache) {
881 krb5_cc_close(context, ccache);
882 }
883 if (context) {
884 krb5_free_context(context);
885 }
886
887 return ret;
888 }
889
890 krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
891 {
892 krb5_error_code ret = 0;
893 if (addr == NULL) {
894 return ret;
895 }
896 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
897 krb5_free_addresses(context, addr->addrs);
898 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
899 ret = krb5_free_addresses(context, addr->addrs);
900 SAFE_FREE(addr->addrs);
901 #endif
902 SAFE_FREE(addr);
903 addr = NULL;
904 return ret;
905 }
906
907 #define MAX_NETBIOSNAME_LEN 16
908 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr,
909 const char *netbios_name)
910 {
911 krb5_error_code ret = 0;
912 char buf[MAX_NETBIOSNAME_LEN];
913 int len;
914 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
915 krb5_address **addrs = NULL;
916 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
917 krb5_addresses *addrs = NULL;
918 #endif
919
920 *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
921 if (*kerb_addr == NULL) {
922 return ENOMEM;
923 }
924
925 /* temporarily duplicate put_name() code here to avoid dependency
926 * issues for a 5 lines function */
927 len = strlen(netbios_name);
928 memcpy(buf, netbios_name,
929 (len < MAX_NETBIOSNAME_LEN) ? len : MAX_NETBIOSNAME_LEN - 1);
930 if (len < MAX_NETBIOSNAME_LEN - 1) {
931 memset(buf + len, ' ', MAX_NETBIOSNAME_LEN - 1 - len);
932 }
933 buf[MAX_NETBIOSNAME_LEN - 1] = 0x20;
934
935 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
936 {
937 int num_addr = 2;
938
939 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
940 if (addrs == NULL) {
941 SAFE_FREE(*kerb_addr);
942 return ENOMEM;
943 }
944
945 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
946
947 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
948 if (addrs[0] == NULL) {
949 SAFE_FREE(addrs);
950 SAFE_FREE(*kerb_addr);
951 return ENOMEM;
952 }
953
954 addrs[0]->magic = KV5M_ADDRESS;
955 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
956 addrs[0]->length = MAX_NETBIOSNAME_LEN;
957 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
958 if (addrs[0]->contents == NULL) {
959 SAFE_FREE(addrs[0]);
960 SAFE_FREE(addrs);
961 SAFE_FREE(*kerb_addr);
962 return ENOMEM;
963 }
964
965 memcpy(addrs[0]->contents, buf, addrs[0]->length);
966
967 addrs[1] = NULL;
968 }
969 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
970 {
971 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
972 if (addrs == NULL) {
973 SAFE_FREE(*kerb_addr);
974 return ENOMEM;
975 }
976
977 memset(addrs, 0, sizeof(krb5_addresses));
978
979 addrs->len = 1;
980 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
981 if (addrs->val == NULL) {
982 SAFE_FREE(addrs);
983 SAFE_FREE(kerb_addr);
984 return ENOMEM;
985 }
986
987 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
988 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
989 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
990 if (addrs->val[0].address.data == NULL) {
991 SAFE_FREE(addrs->val);
992 SAFE_FREE(addrs);
993 SAFE_FREE(*kerb_addr);
994 return ENOMEM;
995 }
996
997 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
998 }
999 #else
1000 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1001 #endif
1002 (*kerb_addr)->addrs = addrs;
1003
1004 return ret;
1005 }
1006
1007 void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1008 {
1009 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1010 krb5_free_error_contents(context, krberror);
1011 #else /* MIT */
1012 krb5_free_error(context, krberror);
1013 #endif
1014 }
1015
1016 krb5_error_code handle_krberror_packet(krb5_context context,
1017 krb5_data *packet)
1018 {
1019 krb5_error_code ret;
1020 bool got_error_code = false;
1021
1022 DEBUG(10,("handle_krberror_packet: got error packet\n"));
1023
1024 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1025 {
1026 krb5_error krberror;
1027
1028 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1029 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1030 error_message(ret)));
1031 return ret;
1032 }
1033
1034 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1035 ret = (krb5_error_code) krberror.error_code;
1036 got_error_code = true;
1037 }
1038
1039 smb_krb5_free_error(context, &krberror);
1040 }
1041 #else /* MIT */
1042 {
1043 krb5_error *krberror;
1044
1045 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1046 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1047 error_message(ret)));
1048 return ret;
1049 }
1050
1051 if (krberror->e_data.data == NULL) {
1052 #if defined(ERROR_TABLE_BASE_krb5)
1053 ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1054 #else
1055 ret = (krb5_error_code)krberror->error;
1056 #endif
1057 got_error_code = true;
1058 }
1059 smb_krb5_free_error(context, krberror);
1060 }
1061 #endif
1062 if (got_error_code) {
1063 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1064 error_message(ret), ret));
1065 }
1066 return ret;
1067 }
1068
1069 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1070 krb5_get_init_creds_opt **opt)
1071 {
1072 /* Heimdal or modern MIT version */
1073 return krb5_get_init_creds_opt_alloc(context, opt);
1074 }
1075
1076 void smb_krb5_get_init_creds_opt_free(krb5_context context,
1077 krb5_get_init_creds_opt *opt)
1078 {
1079 /* Modern MIT or Heimdal version */
1080 krb5_get_init_creds_opt_free(context, opt);
1081 }
1082
1083 krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1084 {
1085 return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1086 }
1087
1088 krb5_error_code smb_krb5_kt_free_entry(krb5_context context,
1089 krb5_keytab_entry *kt_entry)
1090 {
1091 /* Try krb5_free_keytab_entry_contents first, since
1092 * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
1093 * krb5_kt_free_entry but only has a prototype for the first, while the
1094 * second is considered private.
1095 */
1096 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
1097 return krb5_free_keytab_entry_contents(context, kt_entry);
1098 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
1099 return krb5_kt_free_entry(context, kt_entry);
1100 #else
1101 #error UNKNOWN_KT_FREE_FUNCTION
1102 #endif
1103 }
1104
1105
1106 /* caller needs to free etype_s */
1107 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1108 krb5_enctype enctype,
1109 char **etype_s)
1110 {
1111 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1112 return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1113 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1114 char buf[256];
1115 krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1116 if (ret) {
1117 return ret;
1118 }
1119 *etype_s = SMB_STRDUP(buf);
1120 if (!*etype_s) {
1121 return ENOMEM;
1122 }
1123 return ret;
1124 #else
1125 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1126 #endif
1127 }
1128
1129 /**********************************************************************
1130 * Open a krb5 keytab with flags, handles readonly or readwrite access and
1131 * allows to process non-default keytab names.
1132 * @param context krb5_context
1133 * @param keytab_name_req string
1134 * @param write_access bool if writable keytab is required
1135 * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1136 * @return krb5_error_code
1137 **********************************************************************/
1138
1139 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1140 #ifndef MAX_KEYTAB_NAME_LEN
1141 #define MAX_KEYTAB_NAME_LEN 1100
1142 #endif
1143
1144 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1145 const char *keytab_name_req,
1146 bool write_access,
1147 krb5_keytab *keytab)
1148 {
1149 krb5_error_code ret = 0;
1150 TALLOC_CTX *mem_ctx;
1151 char keytab_string[MAX_KEYTAB_NAME_LEN];
1152 char *kt_str = NULL;
1153 bool found_valid_name = false;
1154 const char *pragma = "FILE";
1155 const char *tmp = NULL;
1156
1157 if (!write_access && !keytab_name_req) {
1158 /* caller just wants to read the default keytab readonly, so be it */
1159 return krb5_kt_default(context, keytab);
1160 }
1161
1162 mem_ctx = talloc_init("smb_krb5_open_keytab");
1163 if (!mem_ctx) {
1164 return ENOMEM;
1165 }
1166
1167 #ifdef HAVE_WRFILE_KEYTAB
1168 if (write_access) {
1169 pragma = "WRFILE";
1170 }
1171 #endif
1172
1173 if (keytab_name_req) {
1174
1175 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1176 ret = KRB5_CONFIG_NOTENUFSPACE;
1177 goto out;
1178 }
1179
1180 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1181 (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1182 tmp = keytab_name_req;
1183 goto resolve;
1184 }
1185
1186 if (keytab_name_req[0] != '/') {
1187 ret = KRB5_KT_BADNAME;
1188 goto out;
1189 }
1190
1191 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1192 if (!tmp) {
1193 ret = ENOMEM;
1194 goto out;
1195 }
1196
1197 goto resolve;
1198 }
1199
1200 /* we need to handle more complex keytab_strings, like:
1201 * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1202
1203 ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1204 if (ret) {
1205 goto out;
1206 }
1207
1208 DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1209
1210 tmp = talloc_strdup(mem_ctx, keytab_string);
1211 if (!tmp) {
1212 ret = ENOMEM;
1213 goto out;
1214 }
1215
1216 if (strncmp(tmp, "ANY:", 4) == 0) {
1217 tmp += 4;
1218 }
1219
1220 memset(&keytab_string, '\0', sizeof(keytab_string));
1221
1222 while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1223 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1224 found_valid_name = true;
1225 tmp = kt_str;
1226 tmp += 7;
1227 }
1228
1229 if (strncmp(kt_str, "FILE:", 5) == 0) {
1230 found_valid_name = true;
1231 tmp = kt_str;
1232 tmp += 5;
1233 }
1234
1235 if (tmp[0] == '/') {
1236 /* Treat as a FILE: keytab definition. */
1237 found_valid_name = true;
1238 }
1239
1240 if (found_valid_name) {
1241 if (tmp[0] != '/') {
1242 ret = KRB5_KT_BADNAME;
1243 goto out;
1244 }
1245
1246 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1247 if (!tmp) {
1248 ret = ENOMEM;
1249 goto out;
1250 }
1251 break;
1252 }
1253 }
1254
1255 if (!found_valid_name) {
1256 ret = KRB5_KT_UNKNOWN_TYPE;
1257 goto out;
1258 }
1259
1260 resolve:
1261 DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1262 ret = krb5_kt_resolve(context, tmp, keytab);
1263
1264 out:
1265 TALLOC_FREE(mem_ctx);
1266 return ret;
1267 }
1268
1269 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1270 krb5_context context,
1271 krb5_keytab keytab,
1272 const char **keytab_name)
1273 {
1274 char keytab_string[MAX_KEYTAB_NAME_LEN];
1275 krb5_error_code ret = 0;
1276
1277 ret = krb5_kt_get_name(context, keytab,
1278 keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1279 if (ret) {
1280 return ret;
1281 }
1282
1283 *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1284 if (!*keytab_name) {
1285 return ENOMEM;
1286 }
1287
1288 return ret;
1289 }
1290
1291 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1292 defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1293 defined(HAVE_KRB5_GET_CREDS)
1294 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1295 krb5_ccache ccache,
1296 krb5_principal me,
1297 krb5_principal server,
1298 krb5_principal impersonate_princ,
1299 krb5_creds **out_creds)
1300 {
1301 krb5_error_code ret;
1302 krb5_get_creds_opt opt;
1303
1304 ret = krb5_get_creds_opt_alloc(context, &opt);
1305 if (ret) {
1306 goto done;
1307 }
1308 krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1309
1310 if (impersonate_princ) {
1311 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1312 impersonate_princ);
1313 if (ret) {
1314 goto done;
1315 }
1316 }
1317
1318 ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1319 if (ret) {
1320 goto done;
1321 }
1322
1323 done:
1324 if (opt) {
1325 krb5_get_creds_opt_free(context, opt);
1326 }
1327 return ret;
1328 }
1329 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1330
1331 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1332 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1333 krb5_ccache ccache,
1334 krb5_principal me,
1335 krb5_principal server,
1336 krb5_principal impersonate_princ,
1337 krb5_creds **out_creds)
1338 {
1339 krb5_error_code ret;
1340 krb5_creds in_creds;
1341
1342 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1343 krb5_error_code KRB5_CALLCONV
1344 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1345 krb5_ccache ccache, krb5_creds *in_creds,
1346 krb5_data *subject_cert,
1347 krb5_creds **out_creds);
1348 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1349
1350 ZERO_STRUCT(in_creds);
1351
1352 if (impersonate_princ) {
1353
1354 in_creds.server = me;
1355 in_creds.client = impersonate_princ;
1356
1357 ret = krb5_get_credentials_for_user(context,
1358 0, /* krb5_flags options */
1359 ccache,
1360 &in_creds,
1361 NULL, /* krb5_data *subject_cert */
1362 out_creds);
1363 } else {
1364 in_creds.client = me;
1365 in_creds.server = server;
1366
1367 ret = krb5_get_credentials(context, 0, ccache,
1368 &in_creds, out_creds);
1369 }
1370
1371 return ret;
1372 }
1373 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1374
1375 /*
1376 * smb_krb5_get_credentials
1377 *
1378 * @brief Get krb5 credentials for a server
1379 *
1380 * @param[in] context An initialized krb5_context
1381 * @param[in] ccache An initialized krb5_ccache
1382 * @param[in] me The krb5_principal of the caller
1383 * @param[in] server The krb5_principal of the requested service
1384 * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1385 * @param[out] out_creds The returned krb5_creds structure
1386 * @return krb5_error_code
1387 *
1388 */
1389 krb5_error_code smb_krb5_get_credentials(krb5_context context,
1390 krb5_ccache ccache,
1391 krb5_principal me,
1392 krb5_principal server,
1393 krb5_principal impersonate_princ,
1394 krb5_creds **out_creds)
1395 {
1396 krb5_error_code ret;
1397 krb5_creds *creds = NULL;
1398
1399 *out_creds = NULL;
1400
1401 if (impersonate_princ) {
1402 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
1403 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
1404 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
1405 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
1406 #else
1407 ret = ENOTSUP;
1408 #endif
1409 } else {
1410 krb5_creds in_creds;
1411
1412 ZERO_STRUCT(in_creds);
1413
1414 in_creds.client = me;
1415 in_creds.server = server;
1416
1417 ret = krb5_get_credentials(context, 0, ccache,
1418 &in_creds, &creds);
1419 }
1420 if (ret) {
1421 goto done;
1422 }
1423
1424 if (out_creds) {
1425 *out_creds = creds;
1426 }
1427
1428 done:
1429 if (creds && ret) {
1430 krb5_free_creds(context, creds);
1431 }
1432
1433 return ret;
1434 }
1435
1436 /*
1437 * smb_krb5_get_creds
1438 *
1439 * @brief Get krb5 credentials for a server
1440 *
1441 * @param[in] server_s The string name of the service
1442 * @param[in] time_offset The offset to the KDCs time in seconds (optional)
1443 * @param[in] cc The krb5 credential cache string name (optional)
1444 * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
1445 * @param[out] creds_p The returned krb5_creds structure
1446 * @return krb5_error_code
1447 *
1448 */
1449 krb5_error_code smb_krb5_get_creds(const char *server_s,
1450 time_t time_offset,
1451 const char *cc,
1452 const char *impersonate_princ_s,
1453 krb5_creds **creds_p)
1454 {
1455 krb5_error_code ret;
1456 krb5_context context = NULL;
1457 krb5_principal me = NULL;
1458 krb5_principal server = NULL;
1459 krb5_principal impersonate_princ = NULL;
1460 krb5_creds *creds = NULL;
1461 krb5_ccache ccache = NULL;
1462
1463 *creds_p = NULL;
1464
1465 initialize_krb5_error_table();
1466 ret = krb5_init_context(&context);
1467 if (ret) {
1468 goto done;
1469 }
1470
1471 if (time_offset != 0) {
1472 krb5_set_real_time(context, time(NULL) + time_offset, 0);
1473 }
1474
1475 ret = krb5_cc_resolve(context, cc ? cc :
1476 krb5_cc_default_name(context), &ccache);
1477 if (ret) {
1478 goto done;
1479 }
1480
1481 ret = krb5_cc_get_principal(context, ccache, &me);
1482 if (ret) {
1483 goto done;
1484 }
1485
1486 ret = smb_krb5_parse_name(context, server_s, &server);
1487 if (ret) {
1488 goto done;
1489 }
1490
1491 if (impersonate_princ_s) {
1492 ret = smb_krb5_parse_name(context, impersonate_princ_s,
1493 &impersonate_princ);
1494 if (ret) {
1495 goto done;
1496 }
1497 }
1498
1499 ret = smb_krb5_get_credentials(context, ccache,
1500 me, server, impersonate_princ,
1501 &creds);
1502 if (ret) {
1503 goto done;
1504 }
1505
1506 ret = krb5_cc_store_cred(context, ccache, creds);
1507 if (ret) {
1508 goto done;
1509 }
1510
1511 if (creds_p) {
1512 *creds_p = creds;
1513 }
1514
1515 DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
1516 server_s));
1517
1518 if (impersonate_princ_s) {
1519 char *client = NULL;
1520
1521 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
1522 if (ret) {
1523 goto done;
1524 }
1525 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
1526 client));
1527 TALLOC_FREE(client);
1528 }
1529
1530 done:
1531 if (!context) {
1532 return ret;
1533 }
1534
1535 if (creds && ret) {
1536 krb5_free_creds(context, creds);
1537 }
1538 if (server) {
1539 krb5_free_principal(context, server);
1540 }
1541 if (me) {
1542 krb5_free_principal(context, me);
1543 }
1544 if (impersonate_princ) {
1545 krb5_free_principal(context, impersonate_princ);
1546 }
1547 if (ccache) {
1548 krb5_cc_close(context, ccache);
1549 }
1550 krb5_free_context(context);
1551
1552 return ret;
1553 }
1554
1555 /*
1556 * smb_krb5_principal_get_realm
1557 *
1558 * @brief Get realm of a principal
1559 *
1560 * @param[in] context The krb5_context
1561 * @param[in] principal The principal
1562 * @return pointer to the realm
1563 *
1564 */
1565
1566 char *smb_krb5_principal_get_realm(krb5_context context,
1567 krb5_principal principal)
1568 {
1569 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
1570 return discard_const_p(char, krb5_principal_get_realm(context, principal));
1571 #elif defined(krb5_princ_realm) /* MIT */
1572 krb5_data *realm;
1573 realm = krb5_princ_realm(context, principal);
1574 return discard_const_p(char, realm->data);
1575 #else
1576 return NULL;
1577 #endif
1578 }
1579
1580 /************************************************************************
1581 Routine to get the default realm from the kerberos credentials cache.
1582 Caller must free if the return value is not NULL.
1583 ************************************************************************/
1584
1585 static char *smb_krb5_get_default_realm_from_ccache(TALLOC_CTX *mem_ctx)
1586 {
1587 char *realm = NULL;
1588 krb5_context ctx = NULL;
1589 krb5_ccache cc = NULL;
1590 krb5_principal princ = NULL;
1591
1592 initialize_krb5_error_table();
1593 if (krb5_init_context(&ctx)) {
1594 return NULL;
1595 }
1596
1597 DEBUG(5,("kerberos_get_default_realm_from_ccache: "
1598 "Trying to read krb5 cache: %s\n",
1599 krb5_cc_default_name(ctx)));
1600 if (krb5_cc_default(ctx, &cc)) {
1601 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
1602 "failed to read default cache\n"));
1603 goto out;
1604 }
1605 if (krb5_cc_get_principal(ctx, cc, &princ)) {
1606 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
1607 "failed to get default principal\n"));
1608 goto out;
1609 }
1610
1611 #if defined(HAVE_KRB5_PRINCIPAL_GET_REALM)
1612 realm = talloc_strdup(mem_ctx, krb5_principal_get_realm(ctx, princ));
1613 #elif defined(HAVE_KRB5_PRINC_REALM)
1614 {
1615 krb5_data *realm_data = krb5_princ_realm(ctx, princ);
1616 realm = talloc_strndup(mem_ctx, realm_data->data, realm_data->length);
1617 }
1618 #endif
1619
1620 out:
1621
1622 if (ctx) {
1623 if (princ) {
1624 krb5_free_principal(ctx, princ);
1625 }
1626 if (cc) {
1627 krb5_cc_close(ctx, cc);
1628 }
1629 krb5_free_context(ctx);
1630 }
1631
1632 return realm;
1633 }
1634
1635 /************************************************************************
1636 Routine to get the realm from a given DNS name.
1637 ************************************************************************/
1638
1639 static char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
1640 const char *hostname)
1641 {
1642 #if defined(HAVE_KRB5_REALM_TYPE)
1643 /* Heimdal. */
1644 krb5_realm *realm_list = NULL;
1645 #else
1646 /* MIT */
1647 char **realm_list = NULL;
1648 #endif
1649 char *realm = NULL;
1650 krb5_error_code kerr;
1651 krb5_context ctx = NULL;
1652
1653 initialize_krb5_error_table();
1654 if (krb5_init_context(&ctx)) {
1655 return NULL;
1656 }
1657
1658 kerr = krb5_get_host_realm(ctx, hostname, &realm_list);
1659 if (kerr != 0) {
1660 DEBUG(3,("kerberos_get_realm_from_hostname %s: "
1661 "failed %s\n",
1662 hostname ? hostname : "(NULL)",
1663 error_message(kerr) ));
1664 goto out;
1665 }
1666
1667 if (realm_list && realm_list[0]) {
1668 realm = talloc_strdup(mem_ctx, realm_list[0]);
1669 }
1670
1671 out:
1672
1673 if (ctx) {
1674 if (realm_list) {
1675 krb5_free_host_realm(ctx, realm_list);
1676 realm_list = NULL;
1677 }
1678 krb5_free_context(ctx);
1679 ctx = NULL;
1680 }
1681 return realm;
1682 }
1683
1684 char *kerberos_get_principal_from_service_hostname(TALLOC_CTX *mem_ctx,
1685 const char *service,
1686 const char *remote_name,
1687 const char *default_realm)
1688 {
1689 char *realm = NULL;
1690 char *host = NULL;
1691 char *principal;
1692 host = strchr_m(remote_name, '.');
1693 if (host) {
1694 /* DNS name. */
1695 realm = smb_krb5_get_realm_from_hostname(talloc_tos(),
1696 remote_name);
1697 } else {
1698 /* NetBIOS name - use our realm. */
1699 realm = smb_krb5_get_default_realm_from_ccache(talloc_tos());
1700 }
1701
1702 if (realm == NULL || *realm == '\0') {
1703 realm = talloc_strdup(talloc_tos(), default_realm);
1704 if (!realm) {
1705 return NULL;
1706 }
1707 DEBUG(3,("kerberos_get_principal_from_service_hostname: "
1708 "cannot get realm from, "
1709 "desthost %s or default ccache. Using default "
1710 "smb.conf realm %s\n",
1711 remote_name,
1712 realm));
1713 }
1714
1715 principal = talloc_asprintf(mem_ctx,
1716 "%s/%s@%s",
1717 service, remote_name,
1718 realm);
1719 TALLOC_FREE(realm);
1720 return principal;
1721 }
1722
1723 char *smb_get_krb5_error_message(krb5_context context,
1724 krb5_error_code code,
1725 TALLOC_CTX *mem_ctx)
1726 {
1727 char *ret;
1728
1729 #if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
1730 const char *context_error = krb5_get_error_message(context, code);
1731 if (context_error) {
1732 ret = talloc_asprintf(mem_ctx, "%s: %s",
1733 error_message(code), context_error);
1734 krb5_free_error_message(context, context_error);
1735 return ret;
1736 }
1737 #endif
1738 ret = talloc_strdup(mem_ctx, error_message(code));
1739 return ret;
1740 }
1741
1742 #else /* HAVE_KRB5 */
1743 /* this saves a few linking headaches */
1744 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
1745 const char *principal, time_t time_offset,
1746 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
1747 uint32_t extra_ap_opts,
1748 const char *ccname, time_t *tgs_expire,
1749 const char *impersonate_princ_s)
1750 {
1751 DEBUG(0,("NO KERBEROS SUPPORT\n"));
1752 return 1;
1753 }
1754
1755 #endif /* HAVE_KRB5 */
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