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Make krb5 wrapper library common so they can be used all over
[Samba/vl.git] / lib / krb5_wrap / krb5_samba.c
blob4e555b285331086e515ac564fb906c09a338187e
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
43 /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
44 but still has the symbol */
45 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
46 krb5_error_code krb5_auth_con_set_req_cksumtype(
47 krb5_context context,
48 krb5_auth_context auth_context,
49 krb5_cksumtype cksumtype);
50 #endif
51
52 #if !defined(SMB_MALLOC)
53 #undef malloc
54 #define SMB_MALLOC(s) malloc((s))
55 #endif
56
57 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
58
59 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
60
61 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
62 * to krb5_set_default_tgs_ktypes. See
63 * http://lists.samba.org/archive/samba-technical/2006-July/048271.html
64 *
65 * If the MIT libraries are not exporting internal symbols, we will end up in
66 * this branch, which is correct. Otherwise we will continue to use the
67 * internal symbol
68 */
69 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
70 {
71 return krb5_set_default_tgs_enctypes(ctx, enc);
72 }
73
74 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
75
76 /* Heimdal */
77 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
78 {
79 return krb5_set_default_in_tkt_etypes(ctx, enc);
80 }
81
82 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
83
84 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
85
86 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
87 /* HEIMDAL */
88 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
89 {
90 memset(pkaddr, '\0', sizeof(krb5_address));
91 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
92 if (paddr->ss_family == AF_INET6) {
93 pkaddr->addr_type = KRB5_ADDRESS_INET6;
94 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
95 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
96 return true;
97 }
98 #endif
99 if (paddr->ss_family == AF_INET) {
100 pkaddr->addr_type = KRB5_ADDRESS_INET;
101 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
102 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
103 return true;
104 }
105 return false;
106 }
107 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
108 /* MIT */
109 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
110 {
111 memset(pkaddr, '\0', sizeof(krb5_address));
112 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
113 if (paddr->ss_family == AF_INET6) {
114 pkaddr->addrtype = ADDRTYPE_INET6;
115 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
116 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
117 return true;
118 }
119 #endif
120 if (paddr->ss_family == AF_INET) {
121 pkaddr->addrtype = ADDRTYPE_INET;
122 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
123 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
124 return true;
125 }
126 return false;
127 }
128 #else
129 #error UNKNOWN_ADDRTYPE
130 #endif
131
132 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_C_STRING_TO_KEY)
133 /* MIT */
134 int create_kerberos_key_from_string_direct(krb5_context context,
135 krb5_principal host_princ,
136 krb5_data *password,
137 krb5_keyblock *key,
138 krb5_enctype enctype)
139 {
140 int ret = 0;
141 krb5_data salt;
142
143 ret = krb5_principal2salt(context, host_princ, &salt);
144 if (ret) {
145 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
146 return ret;
147 }
148 ret = krb5_c_string_to_key(context, enctype, password, &salt, key);
149 SAFE_FREE(salt.data);
150
151 return ret;
152 }
153 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
154 /* Heimdal */
155 int create_kerberos_key_from_string_direct(krb5_context context,
156 krb5_principal host_princ,
157 krb5_data *password,
158 krb5_keyblock *key,
159 krb5_enctype enctype)
160 {
161 int ret;
162 krb5_salt salt;
163
164 ret = krb5_get_pw_salt(context, host_princ, &salt);
165 if (ret) {
166 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
167 return ret;
168 }
169
170 ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
171 krb5_free_salt(context, salt);
172
173 return ret;
174 }
175 #else
176 #error UNKNOWN_CREATE_KEY_FUNCTIONS
177 #endif
178
179 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
180 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
181 krb5_enctype **enctypes)
182 {
183 return krb5_get_permitted_enctypes(context, enctypes);
184 }
185 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
186 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
187 krb5_enctype **enctypes)
188 {
189 #ifdef HAVE_KRB5_PDU_NONE_DECL
190 return krb5_get_default_in_tkt_etypes(context, KRB5_PDU_NONE, enctypes);
191 #else
192 return krb5_get_default_in_tkt_etypes(context, enctypes);
193 #endif
194 }
195 #else
196 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
197 #endif
198
199 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
200 krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
201 krb5_auth_context auth_context,
202 krb5_keyblock *keyblock)
203 {
204 return krb5_auth_con_setkey(context, auth_context, keyblock);
205 }
206 #endif
207
208 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
209 DATA_BLOB *edata,
210 DATA_BLOB *edata_out)
211 {
212 DATA_BLOB edata_contents;
213 ASN1_DATA *data;
214 int edata_type;
215
216 if (!edata->length) {
217 return false;
218 }
219
220 data = asn1_init(mem_ctx);
221 if (data == NULL) {
222 return false;
223 }
224
225 asn1_load(data, *edata);
226 asn1_start_tag(data, ASN1_SEQUENCE(0));
227 asn1_start_tag(data, ASN1_CONTEXT(1));
228 asn1_read_Integer(data, &edata_type);
229
230 if (edata_type != KRB5_PADATA_PW_SALT) {
231 DEBUG(0,("edata is not of required type %d but of type %d\n",
232 KRB5_PADATA_PW_SALT, edata_type));
233 asn1_free(data);
234 return false;
235 }
236
237 asn1_start_tag(data, ASN1_CONTEXT(2));
238 asn1_read_OctetString(data, talloc_tos(), &edata_contents);
239 asn1_end_tag(data);
240 asn1_end_tag(data);
241 asn1_end_tag(data);
242 asn1_free(data);
243
244 *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
245
246 data_blob_free(&edata_contents);
247
248 return true;
249 }
250
251
252 static bool ads_cleanup_expired_creds(krb5_context context,
253 krb5_ccache ccache,
254 krb5_creds *credsp)
255 {
256 krb5_error_code retval;
257 const char *cc_type = krb5_cc_get_type(context, ccache);
258
259 DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
260 cc_type, krb5_cc_get_name(context, ccache),
261 http_timestring(talloc_tos(), credsp->times.endtime)));
262
263 /* we will probably need new tickets if the current ones
264 will expire within 10 seconds.
265 */
266 if (credsp->times.endtime >= (time(NULL) + 10))
267 return false;
268
269 /* heimdal won't remove creds from a file ccache, and
270 perhaps we shouldn't anyway, since internally we
271 use memory ccaches, and a FILE one probably means that
272 we're using creds obtained outside of our exectuable
273 */
274 if (strequal(cc_type, "FILE")) {
275 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
276 return false;
277 }
278
279 retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
280 if (retval) {
281 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
282 error_message(retval)));
283 /* If we have an error in this, we want to display it,
284 but continue as though we deleted it */
285 }
286 return true;
287 }
288
289 /* Allocate and setup the auth context into the state we need. */
290
291 static krb5_error_code setup_auth_context(krb5_context context,
292 krb5_auth_context *auth_context)
293 {
294 krb5_error_code retval;
295
296 retval = krb5_auth_con_init(context, auth_context );
297 if (retval) {
298 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
299 error_message(retval)));
300 return retval;
301 }
302
303 /* Ensure this is an addressless ticket. */
304 retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
305 if (retval) {
306 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
307 error_message(retval)));
308 }
309
310 return retval;
311 }
312
313 #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)
314 static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
315 uint32_t gss_flags)
316 {
317 unsigned int orig_length = in_data->length;
318 unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
319 char *gss_cksum = NULL;
320
321 if (orig_length) {
322 /* Extra length field for delgated ticket. */
323 base_cksum_size += 4;
324 }
325
326 if ((unsigned int)base_cksum_size + orig_length <
327 (unsigned int)base_cksum_size) {
328 return EINVAL;
329 }
330
331 gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
332 if (gss_cksum == NULL) {
333 return ENOMEM;
334 }
335
336 memset(gss_cksum, '\0', base_cksum_size + orig_length);
337 SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
338
339 /*
340 * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
341 * This matches the behavior of heimdal and mit.
342 *
343 * And it is needed to work against some closed source
344 * SMB servers.
345 *
346 * See bug #7883
347 */
348 memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
349
350 SIVAL(gss_cksum, 20, gss_flags);
351
352 if (orig_length) {
353 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
354 SSVAL(gss_cksum, 26, orig_length);
355 /* Copy the kerberos KRB_CRED data */
356 memcpy(gss_cksum + 28, in_data->data, orig_length);
357 free(in_data->data);
358 in_data->data = NULL;
359 in_data->length = 0;
360 }
361 in_data->data = gss_cksum;
362 in_data->length = base_cksum_size + orig_length;
363 return 0;
364 }
365 #endif
366
367 /**************************************************************
368 krb5_parse_name that takes a UNIX charset.
369 **************************************************************/
370
371 krb5_error_code smb_krb5_parse_name(krb5_context context,
372 const char *name, /* in unix charset */
373 krb5_principal *principal)
374 {
375 krb5_error_code ret;
376 char *utf8_name;
377 size_t converted_size;
378 TALLOC_CTX *frame = talloc_stackframe();
379
380 if (!push_utf8_talloc(frame, &utf8_name, name, &converted_size)) {
381 talloc_free(frame);
382 return ENOMEM;
383 }
384
385 ret = krb5_parse_name(context, utf8_name, principal);
386 TALLOC_FREE(frame);
387 return ret;
388 }
389
390 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
391 void krb5_free_unparsed_name(krb5_context context, char *val)
392 {
393 SAFE_FREE(val);
394 }
395 #endif
396
397 /**************************************************************
398 krb5_parse_name that returns a UNIX charset name. Must
399 be freed with talloc_free() call.
400 **************************************************************/
401
402 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
403 krb5_context context,
404 krb5_const_principal principal,
405 char **unix_name)
406 {
407 krb5_error_code ret;
408 char *utf8_name;
409 size_t converted_size;
410
411 *unix_name = NULL;
412 ret = krb5_unparse_name(context, principal, &utf8_name);
413 if (ret) {
414 return ret;
415 }
416
417 if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
418 krb5_free_unparsed_name(context, utf8_name);
419 return ENOMEM;
420 }
421 krb5_free_unparsed_name(context, utf8_name);
422 return 0;
423 }
424
425 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
426 const char *name,
427 krb5_principal *principal)
428 {
429 /* we are cheating here because parse_name will in fact set the realm.
430 * We don't care as the only caller of smb_krb5_parse_name_norealm
431 * ignores the realm anyway when calling
432 * smb_krb5_principal_compare_any_realm later - Guenther */
433
434 return smb_krb5_parse_name(context, name, principal);
435 }
436
437 bool smb_krb5_principal_compare_any_realm(krb5_context context,
438 krb5_const_principal princ1,
439 krb5_const_principal princ2)
440 {
441 return krb5_principal_compare_any_realm(context, princ1, princ2);
442 }
443
444 /*
445 we can't use krb5_mk_req because w2k wants the service to be in a particular format
446 */
447 static krb5_error_code ads_krb5_mk_req(krb5_context context,
448 krb5_auth_context *auth_context,
449 const krb5_flags ap_req_options,
450 const char *principal,
451 krb5_ccache ccache,
452 krb5_data *outbuf,
453 time_t *expire_time,
454 const char *impersonate_princ_s)
455 {
456 krb5_error_code retval;
457 krb5_principal server;
458 krb5_principal impersonate_princ = NULL;
459 krb5_creds * credsp;
460 krb5_creds creds;
461 krb5_data in_data;
462 bool creds_ready = false;
463 int i = 0, maxtries = 3;
464
465 ZERO_STRUCT(in_data);
466
467 retval = smb_krb5_parse_name(context, principal, &server);
468 if (retval) {
469 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
470 return retval;
471 }
472
473 if (impersonate_princ_s) {
474 retval = smb_krb5_parse_name(context, impersonate_princ_s,
475 &impersonate_princ);
476 if (retval) {
477 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
478 goto cleanup_princ;
479 }
480 }
481
482 /* obtain ticket & session key */
483 ZERO_STRUCT(creds);
484 if ((retval = krb5_copy_principal(context, server, &creds.server))) {
485 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
486 error_message(retval)));
487 goto cleanup_princ;
488 }
489
490 if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
491 /* This can commonly fail on smbd startup with no ticket in the cache.
492 * Report at higher level than 1. */
493 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
494 error_message(retval)));
495 goto cleanup_creds;
496 }
497
498 while (!creds_ready && (i < maxtries)) {
499
500 if ((retval = smb_krb5_get_credentials(context, ccache,
501 creds.client,
502 creds.server,
503 impersonate_princ,
504 &credsp))) {
505 DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
506 principal, error_message(retval)));
507 goto cleanup_creds;
508 }
509
510 /* cope with ticket being in the future due to clock skew */
511 if ((unsigned)credsp->times.starttime > time(NULL)) {
512 time_t t = time(NULL);
513 int time_offset =(int)((unsigned)credsp->times.starttime-t);
514 DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
515 krb5_set_real_time(context, t + time_offset + 1, 0);
516 }
517
518 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
519 creds_ready = true;
520 }
521
522 i++;
523 }
524
525 DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
526 principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
527 http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
528 (unsigned)credsp->times.endtime));
529
530 if (expire_time) {
531 *expire_time = (time_t)credsp->times.endtime;
532 }
533
534 /* Allocate the auth_context. */
535 retval = setup_auth_context(context, auth_context);
536 if (retval) {
537 DEBUG(1,("setup_auth_context failed (%s)\n",
538 error_message(retval)));
539 goto cleanup_creds;
540 }
541
542 #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)
543 {
544 uint32_t gss_flags = 0;
545
546 if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
547 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
548 as part of the kerberos exchange. */
549
550 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n") );
551
552 retval = krb5_auth_con_setuseruserkey(context,
553 *auth_context,
554 &credsp->keyblock );
555 if (retval) {
556 DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
557 error_message(retval)));
558 goto cleanup_creds;
559 }
560
561 /* Must use a subkey for forwarded tickets. */
562 retval = krb5_auth_con_setflags(context,
563 *auth_context,
564 KRB5_AUTH_CONTEXT_USE_SUBKEY);
565 if (retval) {
566 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
567 error_message(retval)));
568 goto cleanup_creds;
569 }
570
571 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
572 *auth_context, /* Authentication context [in] */
573 discard_const_p(char, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
574 credsp->client, /* Client principal for the tgt [in] */
575 credsp->server, /* Server principal for the tgt [in] */
576 ccache, /* Credential cache to use for storage [in] */
577 1, /* Turn on for "Forwardable ticket" [in] */
578 &in_data ); /* Resulting response [out] */
579
580 if (retval) {
581 DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
582 error_message( retval ) ) );
583
584 /*
585 * This is not fatal. Delete the *auth_context and continue
586 * with krb5_mk_req_extended to get a non-forwardable ticket.
587 */
588
589 if (in_data.data) {
590 free( in_data.data );
591 in_data.data = NULL;
592 in_data.length = 0;
593 }
594 krb5_auth_con_free(context, *auth_context);
595 *auth_context = NULL;
596 retval = setup_auth_context(context, auth_context);
597 if (retval) {
598 DEBUG(1,("setup_auth_context failed (%s)\n",
599 error_message(retval)));
600 goto cleanup_creds;
601 }
602 } else {
603 /* We got a delegated ticket. */
604 gss_flags |= GSS_C_DELEG_FLAG;
605 }
606 }
607
608 /* Frees and reallocates in_data into a GSS checksum blob. */
609 retval = create_gss_checksum(&in_data, gss_flags);
610 if (retval) {
611 goto cleanup_data;
612 }
613
614 /* We always want GSS-checksum types. */
615 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
616 if (retval) {
617 DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
618 error_message(retval)));
619 goto cleanup_data;
620 }
621 }
622 #endif
623
624 retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
625 &in_data, credsp, outbuf);
626 if (retval) {
627 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
628 error_message(retval)));
629 }
630
631 #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)
632 cleanup_data:
633 #endif
634
635 if (in_data.data) {
636 free( in_data.data );
637 in_data.length = 0;
638 }
639
640 krb5_free_creds(context, credsp);
641
642 cleanup_creds:
643 krb5_free_cred_contents(context, &creds);
644
645 cleanup_princ:
646 krb5_free_principal(context, server);
647 if (impersonate_princ) {
648 krb5_free_principal(context, impersonate_princ);
649 }
650
651 return retval;
652 }
653
654 void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
655 {
656 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
657 if (pdata->data) {
658 krb5_free_data_contents(context, pdata);
659 }
660 #elif defined(HAVE_KRB5_DATA_FREE)
661 krb5_data_free(context, pdata);
662 #else
663 SAFE_FREE(pdata->data);
664 #endif
665 }
666
667 /*
668 get a kerberos5 ticket for the given service
669 */
670 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
671 const char *principal, time_t time_offset,
672 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
673 uint32_t extra_ap_opts, const char *ccname,
674 time_t *tgs_expire,
675 const char *impersonate_princ_s)
676
677 {
678 krb5_error_code retval;
679 krb5_data packet;
680 krb5_context context = NULL;
681 krb5_ccache ccdef = NULL;
682 krb5_auth_context auth_context = NULL;
683 krb5_enctype enc_types[] = {
684 ENCTYPE_ARCFOUR_HMAC,
685 ENCTYPE_DES_CBC_MD5,
686 ENCTYPE_DES_CBC_CRC,
687 ENCTYPE_NULL};
688
689 initialize_krb5_error_table();
690 retval = krb5_init_context(&context);
691 if (retval) {
692 DEBUG(1, ("krb5_init_context failed (%s)\n",
693 error_message(retval)));
694 goto failed;
695 }
696
697 if (time_offset != 0) {
698 krb5_set_real_time(context, time(NULL) + time_offset, 0);
699 }
700
701 if ((retval = krb5_cc_resolve(context, ccname ?
702 ccname : krb5_cc_default_name(context), &ccdef))) {
703 DEBUG(1, ("krb5_cc_default failed (%s)\n",
704 error_message(retval)));
705 goto failed;
706 }
707
708 if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
709 DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
710 error_message(retval)));
711 goto failed;
712 }
713
714 retval = ads_krb5_mk_req(context, &auth_context,
715 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
716 principal, ccdef, &packet,
717 tgs_expire, impersonate_princ_s);
718 if (retval) {
719 goto failed;
720 }
721
722 get_krb5_smb_session_key(mem_ctx, context, auth_context,
723 session_key_krb5, false);
724
725 *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
726
727 kerberos_free_data_contents(context, &packet);
728
729 failed:
730
731 if (context) {
732 if (ccdef)
733 krb5_cc_close(context, ccdef);
734 if (auth_context)
735 krb5_auth_con_free(context, auth_context);
736 krb5_free_context(context);
737 }
738
739 return retval;
740 }
741
742 bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
743 krb5_context context,
744 krb5_auth_context auth_context,
745 DATA_BLOB *session_key, bool remote)
746 {
747 krb5_keyblock *skey = NULL;
748 krb5_error_code err = 0;
749 bool ret = false;
750
751 if (remote) {
752 err = krb5_auth_con_getremotesubkey(context,
753 auth_context, &skey);
754 } else {
755 err = krb5_auth_con_getlocalsubkey(context,
756 auth_context, &skey);
757 }
758
759 if (err || skey == NULL) {
760 DEBUG(10, ("KRB5 error getting session key %d\n", err));
761 goto done;
762 }
763
764 DEBUG(10, ("Got KRB5 session key of length %d\n",
765 (int)KRB5_KEY_LENGTH(skey)));
766
767 *session_key = data_blob_talloc(mem_ctx,
768 KRB5_KEY_DATA(skey),
769 KRB5_KEY_LENGTH(skey));
770 dump_data_pw("KRB5 Session Key:\n",
771 session_key->data,
772 session_key->length);
773
774 ret = true;
775
776 done:
777 if (skey) {
778 krb5_free_keyblock(context, skey);
779 }
780
781 return ret;
782 }
783
784
785 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
786 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
787
788 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
789 {
790 static krb5_data kdata;
791
792 kdata.data = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i));
793 kdata.length = strlen((const char *)kdata.data);
794 return &kdata;
795 }
796 #endif
797
798 /* Prototypes */
799
800 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, /* FILE:/tmp/krb5cc_0 */
801 const char *client_string, /* gd@BER.SUSE.DE */
802 const char *service_string, /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
803 time_t *expire_time)
804 {
805 krb5_error_code ret;
806 krb5_context context = NULL;
807 krb5_ccache ccache = NULL;
808 krb5_principal client = NULL;
809 krb5_creds creds, creds_in, *creds_out = NULL;
810
811 ZERO_STRUCT(creds);
812 ZERO_STRUCT(creds_in);
813
814 initialize_krb5_error_table();
815 ret = krb5_init_context(&context);
816 if (ret) {
817 goto done;
818 }
819
820 if (!ccache_string) {
821 ccache_string = krb5_cc_default_name(context);
822 }
823
824 if (!ccache_string) {
825 ret = EINVAL;
826 goto done;
827 }
828
829 DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
830
831 /* FIXME: we should not fall back to defaults */
832 ret = krb5_cc_resolve(context, discard_const_p(char, ccache_string), &ccache);
833 if (ret) {
834 goto done;
835 }
836
837 if (client_string) {
838 ret = smb_krb5_parse_name(context, client_string, &client);
839 if (ret) {
840 goto done;
841 }
842 } else {
843 ret = krb5_cc_get_principal(context, ccache, &client);
844 if (ret) {
845 goto done;
846 }
847 }
848
849 ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string));
850 if (ret) {
851 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
852 goto done;
853 }
854
855 /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
856 ret = krb5_cc_initialize(context, ccache, client);
857 if (ret) {
858 goto done;
859 }
860
861 ret = krb5_cc_store_cred(context, ccache, &creds);
862
863 if (expire_time) {
864 *expire_time = (time_t) creds.times.endtime;
865 }
866
867 done:
868 krb5_free_cred_contents(context, &creds_in);
869
870 if (creds_out) {
871 krb5_free_creds(context, creds_out);
872 } else {
873 krb5_free_cred_contents(context, &creds);
874 }
875
876 if (client) {
877 krb5_free_principal(context, client);
878 }
879 if (ccache) {
880 krb5_cc_close(context, ccache);
881 }
882 if (context) {
883 krb5_free_context(context);
884 }
885
886 return ret;
887 }
888
889 krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
890 {
891 krb5_error_code ret = 0;
892 if (addr == NULL) {
893 return ret;
894 }
895 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
896 krb5_free_addresses(context, addr->addrs);
897 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
898 ret = krb5_free_addresses(context, addr->addrs);
899 SAFE_FREE(addr->addrs);
900 #endif
901 SAFE_FREE(addr);
902 addr = NULL;
903 return ret;
904 }
905
906 #define MAX_NETBIOSNAME_LEN 16
907 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr,
908 const char *netbios_name)
909 {
910 krb5_error_code ret = 0;
911 char buf[MAX_NETBIOSNAME_LEN];
912 int len;
913 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
914 krb5_address **addrs = NULL;
915 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
916 krb5_addresses *addrs = NULL;
917 #endif
918
919 *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
920 if (*kerb_addr == NULL) {
921 return ENOMEM;
922 }
923
924 /* temporarily duplicate put_name() code here to avoid dependency
925 * issues for a 5 lines function */
926 len = strlen(netbios_name);
927 memcpy(buf, netbios_name,
928 (len < MAX_NETBIOSNAME_LEN) ? len : MAX_NETBIOSNAME_LEN - 1);
929 if (len < MAX_NETBIOSNAME_LEN - 1) {
930 memset(buf + len, ' ', MAX_NETBIOSNAME_LEN - 1 - len);
931 }
932 buf[MAX_NETBIOSNAME_LEN - 1] = 0x20;
933
934 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
935 {
936 int num_addr = 2;
937
938 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
939 if (addrs == NULL) {
940 SAFE_FREE(*kerb_addr);
941 return ENOMEM;
942 }
943
944 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
945
946 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
947 if (addrs[0] == NULL) {
948 SAFE_FREE(addrs);
949 SAFE_FREE(*kerb_addr);
950 return ENOMEM;
951 }
952
953 addrs[0]->magic = KV5M_ADDRESS;
954 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
955 addrs[0]->length = MAX_NETBIOSNAME_LEN;
956 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
957 if (addrs[0]->contents == NULL) {
958 SAFE_FREE(addrs[0]);
959 SAFE_FREE(addrs);
960 SAFE_FREE(*kerb_addr);
961 return ENOMEM;
962 }
963
964 memcpy(addrs[0]->contents, buf, addrs[0]->length);
965
966 addrs[1] = NULL;
967 }
968 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
969 {
970 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
971 if (addrs == NULL) {
972 SAFE_FREE(*kerb_addr);
973 return ENOMEM;
974 }
975
976 memset(addrs, 0, sizeof(krb5_addresses));
977
978 addrs->len = 1;
979 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
980 if (addrs->val == NULL) {
981 SAFE_FREE(addrs);
982 SAFE_FREE(kerb_addr);
983 return ENOMEM;
984 }
985
986 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
987 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
988 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
989 if (addrs->val[0].address.data == NULL) {
990 SAFE_FREE(addrs->val);
991 SAFE_FREE(addrs);
992 SAFE_FREE(*kerb_addr);
993 return ENOMEM;
994 }
995
996 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
997 }
998 #else
999 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1000 #endif
1001 (*kerb_addr)->addrs = addrs;
1002
1003 return ret;
1004 }
1005
1006 void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1007 {
1008 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1009 krb5_free_error_contents(context, krberror);
1010 #else /* MIT */
1011 krb5_free_error(context, krberror);
1012 #endif
1013 }
1014
1015 krb5_error_code handle_krberror_packet(krb5_context context,
1016 krb5_data *packet)
1017 {
1018 krb5_error_code ret;
1019 bool got_error_code = false;
1020
1021 DEBUG(10,("handle_krberror_packet: got error packet\n"));
1022
1023 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1024 {
1025 krb5_error krberror;
1026
1027 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1028 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1029 error_message(ret)));
1030 return ret;
1031 }
1032
1033 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1034 ret = (krb5_error_code) krberror.error_code;
1035 got_error_code = true;
1036 }
1037
1038 smb_krb5_free_error(context, &krberror);
1039 }
1040 #else /* MIT */
1041 {
1042 krb5_error *krberror;
1043
1044 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1045 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1046 error_message(ret)));
1047 return ret;
1048 }
1049
1050 if (krberror->e_data.data == NULL) {
1051 #if defined(ERROR_TABLE_BASE_krb5)
1052 ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1053 #else
1054 ret = (krb5_error_code)krberror->error;
1055 #endif
1056 got_error_code = true;
1057 }
1058 smb_krb5_free_error(context, krberror);
1059 }
1060 #endif
1061 if (got_error_code) {
1062 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1063 error_message(ret), ret));
1064 }
1065 return ret;
1066 }
1067
1068 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1069 krb5_get_init_creds_opt **opt)
1070 {
1071 /* Heimdal or modern MIT version */
1072 return krb5_get_init_creds_opt_alloc(context, opt);
1073 }
1074
1075 void smb_krb5_get_init_creds_opt_free(krb5_context context,
1076 krb5_get_init_creds_opt *opt)
1077 {
1078 /* Modern MIT or Heimdal version */
1079 krb5_get_init_creds_opt_free(context, opt);
1080 }
1081
1082 krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1083 {
1084 return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1085 }
1086
1087 krb5_error_code smb_krb5_kt_free_entry(krb5_context context,
1088 krb5_keytab_entry *kt_entry)
1089 {
1090 /* Try krb5_free_keytab_entry_contents first, since
1091 * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
1092 * krb5_kt_free_entry but only has a prototype for the first, while the
1093 * second is considered private.
1094 */
1095 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
1096 return krb5_free_keytab_entry_contents(context, kt_entry);
1097 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
1098 return krb5_kt_free_entry(context, kt_entry);
1099 #else
1100 #error UNKNOWN_KT_FREE_FUNCTION
1101 #endif
1102 }
1103
1104
1105 /* caller needs to free etype_s */
1106 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1107 krb5_enctype enctype,
1108 char **etype_s)
1109 {
1110 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1111 return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1112 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1113 char buf[256];
1114 krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1115 if (ret) {
1116 return ret;
1117 }
1118 *etype_s = SMB_STRDUP(buf);
1119 if (!*etype_s) {
1120 return ENOMEM;
1121 }
1122 return ret;
1123 #else
1124 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1125 #endif
1126 }
1127
1128 /**********************************************************************
1129 * Open a krb5 keytab with flags, handles readonly or readwrite access and
1130 * allows to process non-default keytab names.
1131 * @param context krb5_context
1132 * @param keytab_name_req string
1133 * @param write_access bool if writable keytab is required
1134 * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1135 * @return krb5_error_code
1136 **********************************************************************/
1137
1138 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1139 #ifndef MAX_KEYTAB_NAME_LEN
1140 #define MAX_KEYTAB_NAME_LEN 1100
1141 #endif
1142
1143 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1144 const char *keytab_name_req,
1145 bool write_access,
1146 krb5_keytab *keytab)
1147 {
1148 krb5_error_code ret = 0;
1149 TALLOC_CTX *mem_ctx;
1150 char keytab_string[MAX_KEYTAB_NAME_LEN];
1151 char *kt_str = NULL;
1152 bool found_valid_name = false;
1153 const char *pragma = "FILE";
1154 const char *tmp = NULL;
1155
1156 if (!write_access && !keytab_name_req) {
1157 /* caller just wants to read the default keytab readonly, so be it */
1158 return krb5_kt_default(context, keytab);
1159 }
1160
1161 mem_ctx = talloc_init("smb_krb5_open_keytab");
1162 if (!mem_ctx) {
1163 return ENOMEM;
1164 }
1165
1166 #ifdef HAVE_WRFILE_KEYTAB
1167 if (write_access) {
1168 pragma = "WRFILE";
1169 }
1170 #endif
1171
1172 if (keytab_name_req) {
1173
1174 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1175 ret = KRB5_CONFIG_NOTENUFSPACE;
1176 goto out;
1177 }
1178
1179 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1180 (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1181 tmp = keytab_name_req;
1182 goto resolve;
1183 }
1184
1185 if (keytab_name_req[0] != '/') {
1186 ret = KRB5_KT_BADNAME;
1187 goto out;
1188 }
1189
1190 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1191 if (!tmp) {
1192 ret = ENOMEM;
1193 goto out;
1194 }
1195
1196 goto resolve;
1197 }
1198
1199 /* we need to handle more complex keytab_strings, like:
1200 * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1201
1202 ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1203 if (ret) {
1204 goto out;
1205 }
1206
1207 DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1208
1209 tmp = talloc_strdup(mem_ctx, keytab_string);
1210 if (!tmp) {
1211 ret = ENOMEM;
1212 goto out;
1213 }
1214
1215 if (strncmp(tmp, "ANY:", 4) == 0) {
1216 tmp += 4;
1217 }
1218
1219 memset(&keytab_string, '\0', sizeof(keytab_string));
1220
1221 while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1222 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1223 found_valid_name = true;
1224 tmp = kt_str;
1225 tmp += 7;
1226 }
1227
1228 if (strncmp(kt_str, "FILE:", 5) == 0) {
1229 found_valid_name = true;
1230 tmp = kt_str;
1231 tmp += 5;
1232 }
1233
1234 if (tmp[0] == '/') {
1235 /* Treat as a FILE: keytab definition. */
1236 found_valid_name = true;
1237 }
1238
1239 if (found_valid_name) {
1240 if (tmp[0] != '/') {
1241 ret = KRB5_KT_BADNAME;
1242 goto out;
1243 }
1244
1245 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1246 if (!tmp) {
1247 ret = ENOMEM;
1248 goto out;
1249 }
1250 break;
1251 }
1252 }
1253
1254 if (!found_valid_name) {
1255 ret = KRB5_KT_UNKNOWN_TYPE;
1256 goto out;
1257 }
1258
1259 resolve:
1260 DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1261 ret = krb5_kt_resolve(context, tmp, keytab);
1262
1263 out:
1264 TALLOC_FREE(mem_ctx);
1265 return ret;
1266 }
1267
1268 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1269 krb5_context context,
1270 krb5_keytab keytab,
1271 const char **keytab_name)
1272 {
1273 char keytab_string[MAX_KEYTAB_NAME_LEN];
1274 krb5_error_code ret = 0;
1275
1276 ret = krb5_kt_get_name(context, keytab,
1277 keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1278 if (ret) {
1279 return ret;
1280 }
1281
1282 *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1283 if (!*keytab_name) {
1284 return ENOMEM;
1285 }
1286
1287 return ret;
1288 }
1289
1290 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1291 defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1292 defined(HAVE_KRB5_GET_CREDS)
1293 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1294 krb5_ccache ccache,
1295 krb5_principal me,
1296 krb5_principal server,
1297 krb5_principal impersonate_princ,
1298 krb5_creds **out_creds)
1299 {
1300 krb5_error_code ret;
1301 krb5_get_creds_opt opt;
1302
1303 ret = krb5_get_creds_opt_alloc(context, &opt);
1304 if (ret) {
1305 goto done;
1306 }
1307 krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1308
1309 if (impersonate_princ) {
1310 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1311 impersonate_princ);
1312 if (ret) {
1313 goto done;
1314 }
1315 }
1316
1317 ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1318 if (ret) {
1319 goto done;
1320 }
1321
1322 done:
1323 if (opt) {
1324 krb5_get_creds_opt_free(context, opt);
1325 }
1326 return ret;
1327 }
1328 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1329
1330 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1331 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1332 krb5_ccache ccache,
1333 krb5_principal me,
1334 krb5_principal server,
1335 krb5_principal impersonate_princ,
1336 krb5_creds **out_creds)
1337 {
1338 krb5_error_code ret;
1339 krb5_creds in_creds;
1340
1341 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1342 krb5_error_code KRB5_CALLCONV
1343 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1344 krb5_ccache ccache, krb5_creds *in_creds,
1345 krb5_data *subject_cert,
1346 krb5_creds **out_creds);
1347 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1348
1349 ZERO_STRUCT(in_creds);
1350
1351 if (impersonate_princ) {
1352
1353 in_creds.server = me;
1354 in_creds.client = impersonate_princ;
1355
1356 ret = krb5_get_credentials_for_user(context,
1357 0, /* krb5_flags options */
1358 ccache,
1359 &in_creds,
1360 NULL, /* krb5_data *subject_cert */
1361 out_creds);
1362 } else {
1363 in_creds.client = me;
1364 in_creds.server = server;
1365
1366 ret = krb5_get_credentials(context, 0, ccache,
1367 &in_creds, out_creds);
1368 }
1369
1370 return ret;
1371 }
1372 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1373
1374 /*
1375 * smb_krb5_get_credentials
1376 *
1377 * @brief Get krb5 credentials for a server
1378 *
1379 * @param[in] context An initialized krb5_context
1380 * @param[in] ccache An initialized krb5_ccache
1381 * @param[in] me The krb5_principal of the caller
1382 * @param[in] server The krb5_principal of the requested service
1383 * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1384 * @param[out] out_creds The returned krb5_creds structure
1385 * @return krb5_error_code
1386 *
1387 */
1388 krb5_error_code smb_krb5_get_credentials(krb5_context context,
1389 krb5_ccache ccache,
1390 krb5_principal me,
1391 krb5_principal server,
1392 krb5_principal impersonate_princ,
1393 krb5_creds **out_creds)
1394 {
1395 krb5_error_code ret;
1396 krb5_creds *creds = NULL;
1397
1398 *out_creds = NULL;
1399
1400 if (impersonate_princ) {
1401 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
1402 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
1403 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
1404 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
1405 #else
1406 ret = ENOTSUP;
1407 #endif
1408 } else {
1409 krb5_creds in_creds;
1410
1411 ZERO_STRUCT(in_creds);
1412
1413 in_creds.client = me;
1414 in_creds.server = server;
1415
1416 ret = krb5_get_credentials(context, 0, ccache,
1417 &in_creds, &creds);
1418 }
1419 if (ret) {
1420 goto done;
1421 }
1422
1423 if (out_creds) {
1424 *out_creds = creds;
1425 }
1426
1427 done:
1428 if (creds && ret) {
1429 krb5_free_creds(context, creds);
1430 }
1431
1432 return ret;
1433 }
1434
1435 /*
1436 * smb_krb5_get_creds
1437 *
1438 * @brief Get krb5 credentials for a server
1439 *
1440 * @param[in] server_s The string name of the service
1441 * @param[in] time_offset The offset to the KDCs time in seconds (optional)
1442 * @param[in] cc The krb5 credential cache string name (optional)
1443 * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
1444 * @param[out] creds_p The returned krb5_creds structure
1445 * @return krb5_error_code
1446 *
1447 */
1448 krb5_error_code smb_krb5_get_creds(const char *server_s,
1449 time_t time_offset,
1450 const char *cc,
1451 const char *impersonate_princ_s,
1452 krb5_creds **creds_p)
1453 {
1454 krb5_error_code ret;
1455 krb5_context context = NULL;
1456 krb5_principal me = NULL;
1457 krb5_principal server = NULL;
1458 krb5_principal impersonate_princ = NULL;
1459 krb5_creds *creds = NULL;
1460 krb5_ccache ccache = NULL;
1461
1462 *creds_p = NULL;
1463
1464 initialize_krb5_error_table();
1465 ret = krb5_init_context(&context);
1466 if (ret) {
1467 goto done;
1468 }
1469
1470 if (time_offset != 0) {
1471 krb5_set_real_time(context, time(NULL) + time_offset, 0);
1472 }
1473
1474 ret = krb5_cc_resolve(context, cc ? cc :
1475 krb5_cc_default_name(context), &ccache);
1476 if (ret) {
1477 goto done;
1478 }
1479
1480 ret = krb5_cc_get_principal(context, ccache, &me);
1481 if (ret) {
1482 goto done;
1483 }
1484
1485 ret = smb_krb5_parse_name(context, server_s, &server);
1486 if (ret) {
1487 goto done;
1488 }
1489
1490 if (impersonate_princ_s) {
1491 ret = smb_krb5_parse_name(context, impersonate_princ_s,
1492 &impersonate_princ);
1493 if (ret) {
1494 goto done;
1495 }
1496 }
1497
1498 ret = smb_krb5_get_credentials(context, ccache,
1499 me, server, impersonate_princ,
1500 &creds);
1501 if (ret) {
1502 goto done;
1503 }
1504
1505 ret = krb5_cc_store_cred(context, ccache, creds);
1506 if (ret) {
1507 goto done;
1508 }
1509
1510 if (creds_p) {
1511 *creds_p = creds;
1512 }
1513
1514 DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
1515 server_s));
1516
1517 if (impersonate_princ_s) {
1518 char *client = NULL;
1519
1520 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
1521 if (ret) {
1522 goto done;
1523 }
1524 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
1525 client));
1526 TALLOC_FREE(client);
1527 }
1528
1529 done:
1530 if (!context) {
1531 return ret;
1532 }
1533
1534 if (creds && ret) {
1535 krb5_free_creds(context, creds);
1536 }
1537 if (server) {
1538 krb5_free_principal(context, server);
1539 }
1540 if (me) {
1541 krb5_free_principal(context, me);
1542 }
1543 if (impersonate_princ) {
1544 krb5_free_principal(context, impersonate_princ);
1545 }
1546 if (ccache) {
1547 krb5_cc_close(context, ccache);
1548 }
1549 krb5_free_context(context);
1550
1551 return ret;
1552 }
1553
1554 /*
1555 * smb_krb5_principal_get_realm
1556 *
1557 * @brief Get realm of a principal
1558 *
1559 * @param[in] context The krb5_context
1560 * @param[in] principal The principal
1561 * @return pointer to the realm
1562 *
1563 */
1564
1565 char *smb_krb5_principal_get_realm(krb5_context context,
1566 krb5_principal principal)
1567 {
1568 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
1569 return discard_const_p(char, krb5_principal_get_realm(context, principal));
1570 #elif defined(krb5_princ_realm) /* MIT */
1571 krb5_data *realm;
1572 realm = krb5_princ_realm(context, principal);
1573 return discard_const_p(char, realm->data);
1574 #else
1575 return NULL;
1576 #endif
1577 }
1578
1579 /************************************************************************
1580 Routine to get the default realm from the kerberos credentials cache.
1581 Caller must free if the return value is not NULL.
1582 ************************************************************************/
1583
1584 static char *smb_krb5_get_default_realm_from_ccache(TALLOC_CTX *mem_ctx)
1585 {
1586 char *realm = NULL;
1587 krb5_context ctx = NULL;
1588 krb5_ccache cc = NULL;
1589 krb5_principal princ = NULL;
1590
1591 initialize_krb5_error_table();
1592 if (krb5_init_context(&ctx)) {
1593 return NULL;
1594 }
1595
1596 DEBUG(5,("kerberos_get_default_realm_from_ccache: "
1597 "Trying to read krb5 cache: %s\n",
1598 krb5_cc_default_name(ctx)));
1599 if (krb5_cc_default(ctx, &cc)) {
1600 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
1601 "failed to read default cache\n"));
1602 goto out;
1603 }
1604 if (krb5_cc_get_principal(ctx, cc, &princ)) {
1605 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
1606 "failed to get default principal\n"));
1607 goto out;
1608 }
1609
1610 #if defined(HAVE_KRB5_PRINCIPAL_GET_REALM)
1611 realm = talloc_strdup(mem_ctx, krb5_principal_get_realm(ctx, princ));
1612 #elif defined(HAVE_KRB5_PRINC_REALM)
1613 {
1614 krb5_data *realm_data = krb5_princ_realm(ctx, princ);
1615 realm = talloc_strndup(mem_ctx, realm_data->data, realm_data->length);
1616 }
1617 #endif
1618
1619 out:
1620
1621 if (ctx) {
1622 if (princ) {
1623 krb5_free_principal(ctx, princ);
1624 }
1625 if (cc) {
1626 krb5_cc_close(ctx, cc);
1627 }
1628 krb5_free_context(ctx);
1629 }
1630
1631 return realm;
1632 }
1633
1634 /************************************************************************
1635 Routine to get the realm from a given DNS name.
1636 ************************************************************************/
1637
1638 static char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
1639 const char *hostname)
1640 {
1641 #if defined(HAVE_KRB5_REALM_TYPE)
1642 /* Heimdal. */
1643 krb5_realm *realm_list = NULL;
1644 #else
1645 /* MIT */
1646 char **realm_list = NULL;
1647 #endif
1648 char *realm = NULL;
1649 krb5_error_code kerr;
1650 krb5_context ctx = NULL;
1651
1652 initialize_krb5_error_table();
1653 if (krb5_init_context(&ctx)) {
1654 return NULL;
1655 }
1656
1657 kerr = krb5_get_host_realm(ctx, hostname, &realm_list);
1658 if (kerr != 0) {
1659 DEBUG(3,("kerberos_get_realm_from_hostname %s: "
1660 "failed %s\n",
1661 hostname ? hostname : "(NULL)",
1662 error_message(kerr) ));
1663 goto out;
1664 }
1665
1666 if (realm_list && realm_list[0]) {
1667 realm = talloc_strdup(mem_ctx, realm_list[0]);
1668 }
1669
1670 out:
1671
1672 if (ctx) {
1673 if (realm_list) {
1674 krb5_free_host_realm(ctx, realm_list);
1675 realm_list = NULL;
1676 }
1677 krb5_free_context(ctx);
1678 ctx = NULL;
1679 }
1680 return realm;
1681 }
1682
1683 char *kerberos_get_principal_from_service_hostname(TALLOC_CTX *mem_ctx,
1684 const char *service,
1685 const char *remote_name,
1686 const char *default_realm)
1687 {
1688 char *realm = NULL;
1689 char *host = NULL;
1690 char *principal;
1691 host = strchr_m(remote_name, '.');
1692 if (host) {
1693 /* DNS name. */
1694 realm = smb_krb5_get_realm_from_hostname(talloc_tos(),
1695 remote_name);
1696 } else {
1697 /* NetBIOS name - use our realm. */
1698 realm = smb_krb5_get_default_realm_from_ccache(talloc_tos());
1699 }
1700
1701 if (realm == NULL || *realm == '\0') {
1702 realm = talloc_strdup(talloc_tos(), default_realm);
1703 if (!realm) {
1704 return NULL;
1705 }
1706 DEBUG(3,("kerberos_get_principal_from_service_hostname: "
1707 "cannot get realm from, "
1708 "desthost %s or default ccache. Using default "
1709 "smb.conf realm %s\n",
1710 remote_name,
1711 realm));
1712 }
1713
1714 principal = talloc_asprintf(mem_ctx,
1715 "%s/%s@%s",
1716 service, remote_name,
1717 realm);
1718 TALLOC_FREE(realm);
1719 return principal;
1720 }
1721
1722 char *smb_get_krb5_error_message(krb5_context context,
1723 krb5_error_code code,
1724 TALLOC_CTX *mem_ctx)
1725 {
1726 char *ret;
1727
1728 #if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
1729 const char *context_error = krb5_get_error_message(context, code);
1730 if (context_error) {
1731 ret = talloc_asprintf(mem_ctx, "%s: %s",
1732 error_message(code), context_error);
1733 krb5_free_error_message(context, context_error);
1734 return ret;
1735 }
1736 #endif
1737 ret = talloc_strdup(mem_ctx, error_message(code));
1738 return ret;
1739 }
1740
1741 #else /* HAVE_KRB5 */
1742 /* this saves a few linking headaches */
1743 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
1744 const char *principal, time_t time_offset,
1745 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
1746 uint32_t extra_ap_opts,
1747 const char *ccname, time_t *tgs_expire,
1748 const char *impersonate_princ_s)
1749 {
1750 DEBUG(0,("NO KERBEROS SUPPORT\n"));
1751 return 1;
1752 }
1753
1754 #endif /* HAVE_KRB5 */