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s3-lib: Make it clear that we want to fall trough here.
[Samba.git] / source3 / auth / auth_util.c
blob1367186a55e3f04031183fc90bf4c00028036a90
1 /*
2 Unix SMB/CIFS implementation.
3 Authentication utility functions
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Andrew Bartlett 2001-2011
6 Copyright (C) Jeremy Allison 2000-2001
7 Copyright (C) Rafal Szczesniak 2002
8 Copyright (C) Volker Lendecke 2006-2008
9
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
14
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
22 */
23
24 #include "includes.h"
25 #include "auth.h"
26 #include "../libcli/auth/libcli_auth.h"
27 #include "../lib/crypto/arcfour.h"
28 #include "rpc_client/init_lsa.h"
29 #include "../libcli/security/security.h"
30 #include "../lib/util/util_pw.h"
31 #include "lib/winbind_util.h"
32 #include "passdb.h"
33 #include "../librpc/gen_ndr/ndr_auth.h"
34 #include "../auth/auth_sam_reply.h"
35 #include "../librpc/gen_ndr/idmap.h"
36 #include "lib/param/loadparm.h"
37
38 #undef DBGC_CLASS
39 #define DBGC_CLASS DBGC_AUTH
40
41 /****************************************************************************
42 Create a UNIX user on demand.
43 ****************************************************************************/
44
45 static int _smb_create_user(const char *domain, const char *unix_username, const char *homedir)
46 {
47 TALLOC_CTX *ctx = talloc_tos();
48 char *add_script;
49 int ret;
50
51 add_script = lp_adduser_script(ctx);
52 if (!add_script || !*add_script) {
53 return -1;
54 }
55 add_script = talloc_all_string_sub(ctx,
56 add_script,
57 "%u",
58 unix_username);
59 if (!add_script) {
60 return -1;
61 }
62 if (domain) {
63 add_script = talloc_all_string_sub(ctx,
64 add_script,
65 "%D",
66 domain);
67 if (!add_script) {
68 return -1;
69 }
70 }
71 if (homedir) {
72 add_script = talloc_all_string_sub(ctx,
73 add_script,
74 "%H",
75 homedir);
76 if (!add_script) {
77 return -1;
78 }
79 }
80 ret = smbrun(add_script,NULL);
81 flush_pwnam_cache();
82 DEBUG(ret ? 0 : 3,
83 ("smb_create_user: Running the command `%s' gave %d\n",
84 add_script,ret));
85 return ret;
86 }
87
88 /****************************************************************************
89 Create an auth_usersupplied_data structure after appropriate mapping.
90 ****************************************************************************/
91
92 NTSTATUS make_user_info_map(struct auth_usersupplied_info **user_info,
93 const char *smb_name,
94 const char *client_domain,
95 const char *workstation_name,
96 const struct tsocket_address *remote_address,
97 const DATA_BLOB *lm_pwd,
98 const DATA_BLOB *nt_pwd,
99 const struct samr_Password *lm_interactive_pwd,
100 const struct samr_Password *nt_interactive_pwd,
101 const char *plaintext,
102 enum auth_password_state password_state)
103 {
104 const char *domain;
105 NTSTATUS result;
106 bool was_mapped;
107 char *internal_username = NULL;
108
109 was_mapped = map_username(talloc_tos(), smb_name, &internal_username);
110 if (!internal_username) {
111 return NT_STATUS_NO_MEMORY;
112 }
113
114 DEBUG(5, ("Mapping user [%s]\\[%s] from workstation [%s]\n",
115 client_domain, smb_name, workstation_name));
116
117 domain = client_domain;
118
119 /* If you connect to a Windows domain member using a bogus domain name,
120 * the Windows box will map the BOGUS\user to SAMNAME\user. Thus, if
121 * the Windows box is a DC the name will become DOMAIN\user and be
122 * authenticated against AD, if the Windows box is a member server but
123 * not a DC the name will become WORKSTATION\user. A standalone
124 * non-domain member box will also map to WORKSTATION\user.
125 * This also deals with the client passing in a "" domain */
126
127 if (!is_trusted_domain(domain) &&
128 !strequal(domain, my_sam_name()))
129 {
130 if (lp_map_untrusted_to_domain())
131 domain = my_sam_name();
132 else
133 domain = get_global_sam_name();
134 DEBUG(5, ("Mapped domain from [%s] to [%s] for user [%s] from "
135 "workstation [%s]\n",
136 client_domain, domain, smb_name, workstation_name));
137 }
138
139 /* We know that the given domain is trusted (and we are allowing them),
140 * it is our global SAM name, or for legacy behavior it is our
141 * primary domain name */
142
143 result = make_user_info(user_info, smb_name, internal_username,
144 client_domain, domain, workstation_name,
145 remote_address, lm_pwd, nt_pwd,
146 lm_interactive_pwd, nt_interactive_pwd,
147 plaintext, password_state);
148 if (NT_STATUS_IS_OK(result)) {
149 /* We have tried mapping */
150 (*user_info)->mapped_state = true;
151 /* did we actually map the user to a different name? */
152 (*user_info)->was_mapped = was_mapped;
153 }
154 return result;
155 }
156
157 /****************************************************************************
158 Create an auth_usersupplied_data, making the DATA_BLOBs here.
159 Decrypt and encrypt the passwords.
160 ****************************************************************************/
161
162 bool make_user_info_netlogon_network(struct auth_usersupplied_info **user_info,
163 const char *smb_name,
164 const char *client_domain,
165 const char *workstation_name,
166 const struct tsocket_address *remote_address,
167 uint32 logon_parameters,
168 const uchar *lm_network_pwd,
169 int lm_pwd_len,
170 const uchar *nt_network_pwd,
171 int nt_pwd_len)
172 {
173 bool ret;
174 NTSTATUS status;
175 DATA_BLOB lm_blob = data_blob(lm_network_pwd, lm_pwd_len);
176 DATA_BLOB nt_blob = data_blob(nt_network_pwd, nt_pwd_len);
177
178 status = make_user_info_map(user_info,
179 smb_name, client_domain,
180 workstation_name,
181 remote_address,
182 lm_pwd_len ? &lm_blob : NULL,
183 nt_pwd_len ? &nt_blob : NULL,
184 NULL, NULL, NULL,
185 AUTH_PASSWORD_RESPONSE);
186
187 if (NT_STATUS_IS_OK(status)) {
188 (*user_info)->logon_parameters = logon_parameters;
189 }
190 ret = NT_STATUS_IS_OK(status) ? true : false;
191
192 data_blob_free(&lm_blob);
193 data_blob_free(&nt_blob);
194 return ret;
195 }
196
197 /****************************************************************************
198 Create an auth_usersupplied_data, making the DATA_BLOBs here.
199 Decrypt and encrypt the passwords.
200 ****************************************************************************/
201
202 bool make_user_info_netlogon_interactive(struct auth_usersupplied_info **user_info,
203 const char *smb_name,
204 const char *client_domain,
205 const char *workstation_name,
206 const struct tsocket_address *remote_address,
207 uint32 logon_parameters,
208 const uchar chal[8],
209 const uchar lm_interactive_pwd[16],
210 const uchar nt_interactive_pwd[16])
211 {
212 struct samr_Password lm_pwd;
213 struct samr_Password nt_pwd;
214 unsigned char local_lm_response[24];
215 unsigned char local_nt_response[24];
216
217 if (lm_interactive_pwd)
218 memcpy(lm_pwd.hash, lm_interactive_pwd, sizeof(lm_pwd.hash));
219
220 if (nt_interactive_pwd)
221 memcpy(nt_pwd.hash, nt_interactive_pwd, sizeof(nt_pwd.hash));
222
223 if (lm_interactive_pwd)
224 SMBOWFencrypt(lm_pwd.hash, chal,
225 local_lm_response);
226
227 if (nt_interactive_pwd)
228 SMBOWFencrypt(nt_pwd.hash, chal,
229 local_nt_response);
230
231 {
232 bool ret;
233 NTSTATUS nt_status;
234 DATA_BLOB local_lm_blob = data_blob_null;
235 DATA_BLOB local_nt_blob = data_blob_null;
236
237 if (lm_interactive_pwd) {
238 local_lm_blob = data_blob(local_lm_response,
239 sizeof(local_lm_response));
240 }
241
242 if (nt_interactive_pwd) {
243 local_nt_blob = data_blob(local_nt_response,
244 sizeof(local_nt_response));
245 }
246
247 nt_status = make_user_info_map(
248 user_info,
249 smb_name, client_domain, workstation_name,
250 remote_address,
251 lm_interactive_pwd ? &local_lm_blob : NULL,
252 nt_interactive_pwd ? &local_nt_blob : NULL,
253 lm_interactive_pwd ? &lm_pwd : NULL,
254 nt_interactive_pwd ? &nt_pwd : NULL,
255 NULL, AUTH_PASSWORD_HASH);
256
257 if (NT_STATUS_IS_OK(nt_status)) {
258 (*user_info)->logon_parameters = logon_parameters;
259 }
260
261 ret = NT_STATUS_IS_OK(nt_status) ? true : false;
262 data_blob_free(&local_lm_blob);
263 data_blob_free(&local_nt_blob);
264 return ret;
265 }
266 }
267
268
269 /****************************************************************************
270 Create an auth_usersupplied_data structure
271 ****************************************************************************/
272
273 bool make_user_info_for_reply(struct auth_usersupplied_info **user_info,
274 const char *smb_name,
275 const char *client_domain,
276 const struct tsocket_address *remote_address,
277 const uint8 chal[8],
278 DATA_BLOB plaintext_password)
279 {
280
281 DATA_BLOB local_lm_blob;
282 DATA_BLOB local_nt_blob;
283 NTSTATUS ret = NT_STATUS_UNSUCCESSFUL;
284 char *plaintext_password_string;
285 /*
286 * Not encrypted - do so.
287 */
288
289 DEBUG(5,("make_user_info_for_reply: User passwords not in encrypted "
290 "format.\n"));
291 if (plaintext_password.data && plaintext_password.length) {
292 unsigned char local_lm_response[24];
293
294 #ifdef DEBUG_PASSWORD
295 DEBUG(10,("Unencrypted password (len %d):\n",
296 (int)plaintext_password.length));
297 dump_data(100, plaintext_password.data,
298 plaintext_password.length);
299 #endif
300
301 SMBencrypt( (const char *)plaintext_password.data,
302 (const uchar*)chal, local_lm_response);
303 local_lm_blob = data_blob(local_lm_response, 24);
304
305 /* We can't do an NT hash here, as the password needs to be
306 case insensitive */
307 local_nt_blob = data_blob_null;
308 } else {
309 local_lm_blob = data_blob_null;
310 local_nt_blob = data_blob_null;
311 }
312
313 plaintext_password_string = talloc_strndup(talloc_tos(),
314 (const char *)plaintext_password.data,
315 plaintext_password.length);
316 if (!plaintext_password_string) {
317 return false;
318 }
319
320 ret = make_user_info(
321 user_info, smb_name, smb_name, client_domain, client_domain,
322 get_remote_machine_name(),
323 remote_address,
324 local_lm_blob.data ? &local_lm_blob : NULL,
325 local_nt_blob.data ? &local_nt_blob : NULL,
326 NULL, NULL,
327 plaintext_password_string,
328 AUTH_PASSWORD_PLAIN);
329
330 if (plaintext_password_string) {
331 memset(plaintext_password_string, '\0', strlen(plaintext_password_string));
332 talloc_free(plaintext_password_string);
333 }
334
335 data_blob_free(&local_lm_blob);
336 return NT_STATUS_IS_OK(ret) ? true : false;
337 }
338
339 /****************************************************************************
340 Create an auth_usersupplied_data structure
341 ****************************************************************************/
342
343 NTSTATUS make_user_info_for_reply_enc(struct auth_usersupplied_info **user_info,
344 const char *smb_name,
345 const char *client_domain,
346 const struct tsocket_address *remote_address,
347 DATA_BLOB lm_resp, DATA_BLOB nt_resp)
348 {
349 return make_user_info(user_info, smb_name, smb_name,
350 client_domain, client_domain,
351 get_remote_machine_name(),
352 remote_address,
353 lm_resp.data && (lm_resp.length > 0) ? &lm_resp : NULL,
354 nt_resp.data && (nt_resp.length > 0) ? &nt_resp : NULL,
355 NULL, NULL, NULL,
356 AUTH_PASSWORD_RESPONSE);
357 }
358
359 /****************************************************************************
360 Create a guest user_info blob, for anonymous authentication.
361 ****************************************************************************/
362
363 bool make_user_info_guest(const struct tsocket_address *remote_address,
364 struct auth_usersupplied_info **user_info)
365 {
366 NTSTATUS nt_status;
367
368 nt_status = make_user_info(user_info,
369 "","",
370 "","",
371 "",
372 remote_address,
373 NULL, NULL,
374 NULL, NULL,
375 NULL,
376 AUTH_PASSWORD_RESPONSE);
377
378 return NT_STATUS_IS_OK(nt_status) ? true : false;
379 }
380
381 static NTSTATUS log_nt_token(struct security_token *token)
382 {
383 TALLOC_CTX *frame = talloc_stackframe();
384 char *command;
385 char *group_sidstr;
386 size_t i;
387
388 if ((lp_log_nt_token_command(frame) == NULL) ||
389 (strlen(lp_log_nt_token_command(frame)) == 0)) {
390 TALLOC_FREE(frame);
391 return NT_STATUS_OK;
392 }
393
394 group_sidstr = talloc_strdup(frame, "");
395 for (i=1; i<token->num_sids; i++) {
396 group_sidstr = talloc_asprintf(
397 frame, "%s %s", group_sidstr,
398 sid_string_talloc(frame, &token->sids[i]));
399 }
400
401 command = talloc_string_sub(
402 frame, lp_log_nt_token_command(frame),
403 "%s", sid_string_talloc(frame, &token->sids[0]));
404 command = talloc_string_sub(frame, command, "%t", group_sidstr);
405
406 if (command == NULL) {
407 TALLOC_FREE(frame);
408 return NT_STATUS_NO_MEMORY;
409 }
410
411 DEBUG(8, ("running command: [%s]\n", command));
412 if (smbrun(command, NULL) != 0) {
413 DEBUG(0, ("Could not log NT token\n"));
414 TALLOC_FREE(frame);
415 return NT_STATUS_ACCESS_DENIED;
416 }
417
418 TALLOC_FREE(frame);
419 return NT_STATUS_OK;
420 }
421
422 /*
423 * Create the token to use from server_info->info3 and
424 * server_info->sids (the info3/sam groups). Find the unix gids.
425 */
426
427 NTSTATUS create_local_token(TALLOC_CTX *mem_ctx,
428 const struct auth_serversupplied_info *server_info,
429 DATA_BLOB *session_key,
430 const char *smb_username, /* for ->sanitized_username, for %U subs */
431 struct auth_session_info **session_info_out)
432 {
433 struct security_token *t;
434 NTSTATUS status;
435 size_t i;
436 struct dom_sid tmp_sid;
437 struct auth_session_info *session_info;
438 struct unixid *ids;
439 fstring tmp;
440
441 /* Ensure we can't possible take a code path leading to a
442 * null defref. */
443 if (!server_info) {
444 return NT_STATUS_LOGON_FAILURE;
445 }
446
447 session_info = talloc_zero(mem_ctx, struct auth_session_info);
448 if (!session_info) {
449 return NT_STATUS_NO_MEMORY;
450 }
451
452 session_info->unix_token = talloc_zero(session_info, struct security_unix_token);
453 if (!session_info->unix_token) {
454 TALLOC_FREE(session_info);
455 return NT_STATUS_NO_MEMORY;
456 }
457
458 session_info->unix_token->uid = server_info->utok.uid;
459 session_info->unix_token->gid = server_info->utok.gid;
460
461 session_info->unix_info = talloc_zero(session_info, struct auth_user_info_unix);
462 if (!session_info->unix_info) {
463 TALLOC_FREE(session_info);
464 return NT_STATUS_NO_MEMORY;
465 }
466
467 session_info->unix_info->unix_name = talloc_strdup(session_info, server_info->unix_name);
468 if (!session_info->unix_info->unix_name) {
469 TALLOC_FREE(session_info);
470 return NT_STATUS_NO_MEMORY;
471 }
472
473 /* This is a potentially untrusted username for use in %U */
474 alpha_strcpy(tmp, smb_username, ". _-$", sizeof(tmp));
475 session_info->unix_info->sanitized_username =
476 talloc_strdup(session_info->unix_info, tmp);
477
478 if (session_key) {
479 data_blob_free(&session_info->session_key);
480 session_info->session_key = data_blob_talloc(session_info,
481 session_key->data,
482 session_key->length);
483 if (!session_info->session_key.data && session_key->length) {
484 return NT_STATUS_NO_MEMORY;
485 }
486 } else {
487 session_info->session_key = data_blob_talloc( session_info, server_info->session_key.data,
488 server_info->session_key.length);
489 }
490
491 /* We need to populate session_info->info with the information found in server_info->info3 */
492 status = make_user_info_SamBaseInfo(session_info, "", &server_info->info3->base,
493 server_info->guest == false,
494 &session_info->info);
495 if (!NT_STATUS_IS_OK(status)) {
496 DEBUG(0, ("conversion of info3 into auth_user_info failed!\n"));
497 TALLOC_FREE(session_info);
498 return status;
499 }
500
501 if (server_info->security_token) {
502 /* Just copy the token, it has already been finalised
503 * (nasty hack to support a cached guest/system session_info
504 */
505
506 session_info->security_token = dup_nt_token(session_info, server_info->security_token);
507 if (!session_info->security_token) {
508 TALLOC_FREE(session_info);
509 return NT_STATUS_NO_MEMORY;
510 }
511
512 session_info->unix_token->ngroups = server_info->utok.ngroups;
513 if (server_info->utok.ngroups != 0) {
514 session_info->unix_token->groups = (gid_t *)talloc_memdup(
515 session_info->unix_token, server_info->utok.groups,
516 sizeof(gid_t)*session_info->unix_token->ngroups);
517 } else {
518 session_info->unix_token->groups = NULL;
519 }
520
521 *session_info_out = session_info;
522 return NT_STATUS_OK;
523 }
524
525 /*
526 * If winbind is not around, we can not make much use of the SIDs the
527 * domain controller provided us with. Likewise if the user name was
528 * mapped to some local unix user.
529 */
530
531 if (((lp_server_role() == ROLE_DOMAIN_MEMBER) && !winbind_ping()) ||
532 (server_info->nss_token)) {
533 char *found_username = NULL;
534 status = create_token_from_username(session_info,
535 server_info->unix_name,
536 server_info->guest,
537 &session_info->unix_token->uid,
538 &session_info->unix_token->gid,
539 &found_username,
540 &session_info->security_token);
541 if (NT_STATUS_IS_OK(status)) {
542 session_info->unix_info->unix_name = found_username;
543 }
544 } else {
545 status = create_local_nt_token_from_info3(session_info,
546 server_info->guest,
547 server_info->info3,
548 &server_info->extra,
549 &session_info->security_token);
550 }
551
552 if (!NT_STATUS_IS_OK(status)) {
553 return status;
554 }
555
556 /* Convert the SIDs to gids. */
557
558 session_info->unix_token->ngroups = 0;
559 session_info->unix_token->groups = NULL;
560
561 t = session_info->security_token;
562
563 ids = talloc_array(talloc_tos(), struct unixid,
564 t->num_sids);
565 if (ids == NULL) {
566 return NT_STATUS_NO_MEMORY;
567 }
568
569 if (!sids_to_unixids(t->sids, t->num_sids, ids)) {
570 TALLOC_FREE(ids);
571 return NT_STATUS_NO_MEMORY;
572 }
573
574 for (i=0; i<t->num_sids; i++) {
575
576 if (i == 0 && ids[i].type != ID_TYPE_BOTH) {
577 continue;
578 }
579
580 if (ids[i].type != ID_TYPE_GID &&
581 ids[i].type != ID_TYPE_BOTH) {
582 DEBUG(10, ("Could not convert SID %s to gid, "
583 "ignoring it\n",
584 sid_string_dbg(&t->sids[i])));
585 continue;
586 }
587 if (!add_gid_to_array_unique(session_info, ids[i].id,
588 &session_info->unix_token->groups,
589 &session_info->unix_token->ngroups)) {
590 return NT_STATUS_NO_MEMORY;
591 }
592 }
593
594 /*
595 * Add the "Unix Group" SID for each gid to catch mapped groups
596 * and their Unix equivalent. This is to solve the backwards
597 * compatibility problem of 'valid users = +ntadmin' where
598 * ntadmin has been paired with "Domain Admins" in the group
599 * mapping table. Otherwise smb.conf would need to be changed
600 * to 'valid user = "Domain Admins"'. --jerry
601 *
602 * For consistency we also add the "Unix User" SID,
603 * so that the complete unix token is represented within
604 * the nt token.
605 */
606
607 uid_to_unix_users_sid(session_info->unix_token->uid, &tmp_sid);
608
609 add_sid_to_array_unique(session_info->security_token, &tmp_sid,
610 &session_info->security_token->sids,
611 &session_info->security_token->num_sids);
612
613 for ( i=0; i<session_info->unix_token->ngroups; i++ ) {
614 gid_to_unix_groups_sid(session_info->unix_token->groups[i], &tmp_sid);
615 add_sid_to_array_unique(session_info->security_token, &tmp_sid,
616 &session_info->security_token->sids,
617 &session_info->security_token->num_sids);
618 }
619
620 security_token_debug(DBGC_AUTH, 10, session_info->security_token);
621 debug_unix_user_token(DBGC_AUTH, 10,
622 session_info->unix_token->uid,
623 session_info->unix_token->gid,
624 session_info->unix_token->ngroups,
625 session_info->unix_token->groups);
626
627 status = log_nt_token(session_info->security_token);
628 if (!NT_STATUS_IS_OK(status)) {
629 return status;
630 }
631
632 *session_info_out = session_info;
633 return NT_STATUS_OK;
634 }
635
636 /***************************************************************************
637 Make (and fill) a server_info struct from a 'struct passwd' by conversion
638 to a struct samu
639 ***************************************************************************/
640
641 NTSTATUS make_server_info_pw(struct auth_serversupplied_info **server_info,
642 char *unix_username,
643 struct passwd *pwd)
644 {
645 NTSTATUS status;
646 struct samu *sampass = NULL;
647 char *qualified_name = NULL;
648 TALLOC_CTX *mem_ctx = NULL;
649 struct dom_sid u_sid;
650 enum lsa_SidType type;
651 struct auth_serversupplied_info *result;
652
653 /*
654 * The SID returned in server_info->sam_account is based
655 * on our SAM sid even though for a pure UNIX account this should
656 * not be the case as it doesn't really exist in the SAM db.
657 * This causes lookups on "[in]valid users" to fail as they
658 * will lookup this name as a "Unix User" SID to check against
659 * the user token. Fix this by adding the "Unix User"\unix_username
660 * SID to the sid array. The correct fix should probably be
661 * changing the server_info->sam_account user SID to be a
662 * S-1-22 Unix SID, but this might break old configs where
663 * plaintext passwords were used with no SAM backend.
664 */
665
666 mem_ctx = talloc_init("make_server_info_pw_tmp");
667 if (!mem_ctx) {
668 return NT_STATUS_NO_MEMORY;
669 }
670
671 qualified_name = talloc_asprintf(mem_ctx, "%s\\%s",
672 unix_users_domain_name(),
673 unix_username );
674 if (!qualified_name) {
675 TALLOC_FREE(mem_ctx);
676 return NT_STATUS_NO_MEMORY;
677 }
678
679 if (!lookup_name(mem_ctx, qualified_name, LOOKUP_NAME_ALL,
680 NULL, NULL,
681 &u_sid, &type)) {
682 TALLOC_FREE(mem_ctx);
683 return NT_STATUS_NO_SUCH_USER;
684 }
685
686 TALLOC_FREE(mem_ctx);
687
688 if (type != SID_NAME_USER) {
689 return NT_STATUS_NO_SUCH_USER;
690 }
691
692 if ( !(sampass = samu_new( NULL )) ) {
693 return NT_STATUS_NO_MEMORY;
694 }
695
696 status = samu_set_unix( sampass, pwd );
697 if (!NT_STATUS_IS_OK(status)) {
698 return status;
699 }
700
701 /* In pathological cases the above call can set the account
702 * name to the DOMAIN\username form. Reset the account name
703 * using unix_username */
704 pdb_set_username(sampass, unix_username, PDB_SET);
705
706 /* set the user sid to be the calculated u_sid */
707 pdb_set_user_sid(sampass, &u_sid, PDB_SET);
708
709 result = make_server_info(NULL);
710 if (result == NULL) {
711 TALLOC_FREE(sampass);
712 return NT_STATUS_NO_MEMORY;
713 }
714
715 status = samu_to_SamInfo3(result, sampass, lp_netbios_name(),
716 &result->info3, &result->extra);
717 TALLOC_FREE(sampass);
718 if (!NT_STATUS_IS_OK(status)) {
719 DEBUG(10, ("Failed to convert samu to info3: %s\n",
720 nt_errstr(status)));
721 TALLOC_FREE(result);
722 return status;
723 }
724
725 result->unix_name = talloc_strdup(result, unix_username);
726
727 if (result->unix_name == NULL) {
728 TALLOC_FREE(result);
729 return NT_STATUS_NO_MEMORY;
730 }
731
732 result->utok.uid = pwd->pw_uid;
733 result->utok.gid = pwd->pw_gid;
734
735 *server_info = result;
736
737 return NT_STATUS_OK;
738 }
739
740 static NTSTATUS get_system_info3(TALLOC_CTX *mem_ctx,
741 struct netr_SamInfo3 *info3)
742 {
743 NTSTATUS status;
744 struct dom_sid *system_sid;
745
746 /* Set account name */
747 init_lsa_String(&info3->base.account_name, "SYSTEM");
748
749 /* Set domain name */
750 init_lsa_StringLarge(&info3->base.logon_domain, "NT AUTHORITY");
751
752
753 /* The SID set here will be overwirtten anyway, but try and make it SID_NT_SYSTEM anyway */
754 /* Domain sid is NT_AUTHORITY */
755
756 system_sid = dom_sid_parse_talloc(mem_ctx, SID_NT_SYSTEM);
757 if (system_sid == NULL) {
758 return NT_STATUS_NO_MEMORY;
759 }
760
761 status = dom_sid_split_rid(mem_ctx, system_sid, &info3->base.domain_sid,
762 &info3->base.rid);
763 TALLOC_FREE(system_sid);
764 if (!NT_STATUS_IS_OK(status)) {
765 return status;
766 }
767
768 /* Primary gid is the same */
769 info3->base.primary_gid = info3->base.rid;
770
771 return NT_STATUS_OK;
772 }
773
774 static NTSTATUS get_guest_info3(TALLOC_CTX *mem_ctx,
775 struct netr_SamInfo3 *info3)
776 {
777 const char *guest_account = lp_guestaccount();
778 struct dom_sid domain_sid;
779 struct passwd *pwd;
780 const char *tmp;
781
782 pwd = Get_Pwnam_alloc(mem_ctx, guest_account);
783 if (pwd == NULL) {
784 DEBUG(0,("SamInfo3_for_guest: Unable to locate guest "
785 "account [%s]!\n", guest_account));
786 return NT_STATUS_NO_SUCH_USER;
787 }
788
789 /* Set account name */
790 tmp = talloc_strdup(mem_ctx, pwd->pw_name);
791 if (tmp == NULL) {
792 return NT_STATUS_NO_MEMORY;
793 }
794 init_lsa_String(&info3->base.account_name, tmp);
795
796 /* Set domain name */
797 tmp = talloc_strdup(mem_ctx, get_global_sam_name());
798 if (tmp == NULL) {
799 return NT_STATUS_NO_MEMORY;
800 }
801 init_lsa_StringLarge(&info3->base.logon_domain, tmp);
802
803 /* Domain sid */
804 sid_copy(&domain_sid, get_global_sam_sid());
805
806 info3->base.domain_sid = dom_sid_dup(mem_ctx, &domain_sid);
807 if (info3->base.domain_sid == NULL) {
808 return NT_STATUS_NO_MEMORY;
809 }
810
811 /* Guest rid */
812 info3->base.rid = DOMAIN_RID_GUEST;
813
814 /* Primary gid */
815 info3->base.primary_gid = DOMAIN_RID_GUESTS;
816
817 /* Set as guest */
818 info3->base.user_flags = NETLOGON_GUEST;
819
820 TALLOC_FREE(pwd);
821 return NT_STATUS_OK;
822 }
823
824 /***************************************************************************
825 Make (and fill) a user_info struct for a guest login.
826 This *must* succeed for smbd to start. If there is no mapping entry for
827 the guest gid, then create one.
828
829 The resulting structure is a 'session_info' because
830 create_local_token() has already been called on it. This is quite
831 nasty, as the auth subsystem isn't expect this, but the behavior is
832 left as-is for now.
833 ***************************************************************************/
834
835 static NTSTATUS make_new_session_info_guest(struct auth_session_info **session_info, struct auth_serversupplied_info **server_info)
836 {
837 static const char zeros[16] = {0};
838 const char *guest_account = lp_guestaccount();
839 const char *domain = lp_netbios_name();
840 struct netr_SamInfo3 info3;
841 TALLOC_CTX *tmp_ctx;
842 NTSTATUS status;
843
844 tmp_ctx = talloc_stackframe();
845 if (tmp_ctx == NULL) {
846 return NT_STATUS_NO_MEMORY;
847 }
848
849 ZERO_STRUCT(info3);
850
851 status = get_guest_info3(tmp_ctx, &info3);
852 if (!NT_STATUS_IS_OK(status)) {
853 DEBUG(0, ("get_guest_info3 failed with %s\n",
854 nt_errstr(status)));
855 goto done;
856 }
857
858 status = make_server_info_info3(tmp_ctx,
859 guest_account,
860 domain,
861 server_info,
862 &info3);
863 if (!NT_STATUS_IS_OK(status)) {
864 DEBUG(0, ("make_server_info_info3 failed with %s\n",
865 nt_errstr(status)));
866 goto done;
867 }
868
869 (*server_info)->guest = true;
870
871 /* This should not be done here (we should produce a server
872 * info, and later construct a session info from it), but for
873 * now this does not change the previous behavior */
874 status = create_local_token(tmp_ctx, *server_info, NULL,
875 (*server_info)->info3->base.account_name.string,
876 session_info);
877 if (!NT_STATUS_IS_OK(status)) {
878 DEBUG(0, ("create_local_token failed: %s\n",
879 nt_errstr(status)));
880 goto done;
881 }
882 talloc_steal(NULL, *session_info);
883 talloc_steal(NULL, *server_info);
884
885 /* annoying, but the Guest really does have a session key, and it is
886 all zeros! */
887 (*session_info)->session_key = data_blob(zeros, sizeof(zeros));
888
889 status = NT_STATUS_OK;
890 done:
891 TALLOC_FREE(tmp_ctx);
892 return status;
893 }
894
895 /***************************************************************************
896 Make (and fill) a auth_session_info struct for a system user login.
897 This *must* succeed for smbd to start.
898 ***************************************************************************/
899
900 static NTSTATUS make_new_session_info_system(TALLOC_CTX *mem_ctx,
901 struct auth_session_info **session_info)
902 {
903 NTSTATUS status;
904 struct auth_serversupplied_info *server_info;
905 TALLOC_CTX *tmp_ctx;
906
907 tmp_ctx = talloc_stackframe();
908 if (tmp_ctx == NULL) {
909 return NT_STATUS_NO_MEMORY;
910 }
911
912 server_info = make_server_info(tmp_ctx);
913 if (!server_info) {
914 status = NT_STATUS_NO_MEMORY;
915 DEBUG(0, ("failed making server_info\n"));
916 goto done;
917 }
918
919 server_info->info3 = talloc_zero(server_info, struct netr_SamInfo3);
920 if (!server_info->info3) {
921 status = NT_STATUS_NO_MEMORY;
922 DEBUG(0, ("talloc failed setting info3\n"));
923 goto done;
924 }
925
926 status = get_system_info3(server_info, server_info->info3);
927 if (!NT_STATUS_IS_OK(status)) {
928 DEBUG(0, ("Failed creating system info3 with %s\n",
929 nt_errstr(status)));
930 goto done;
931 }
932
933 server_info->utok.uid = sec_initial_uid();
934 server_info->utok.gid = sec_initial_gid();
935 server_info->unix_name = talloc_asprintf(server_info,
936 "NT AUTHORITY%cSYSTEM",
937 *lp_winbind_separator());
938
939 if (!server_info->unix_name) {
940 status = NT_STATUS_NO_MEMORY;
941 DEBUG(0, ("talloc_asprintf failed setting unix_name\n"));
942 goto done;
943 }
944
945 server_info->security_token = talloc_zero(server_info, struct security_token);
946 if (!server_info->security_token) {
947 status = NT_STATUS_NO_MEMORY;
948 DEBUG(0, ("talloc failed setting security token\n"));
949 goto done;
950 }
951
952 status = add_sid_to_array_unique(server_info->security_token->sids,
953 &global_sid_System,
954 &server_info->security_token->sids,
955 &server_info->security_token->num_sids);
956 if (!NT_STATUS_IS_OK(status)) {
957 goto done;
958 }
959
960 /* SYSTEM has all privilages */
961 server_info->security_token->privilege_mask = ~0;
962
963 /* Now turn the server_info into a session_info with the full token etc */
964 status = create_local_token(mem_ctx, server_info, NULL, "SYSTEM", session_info);
965 talloc_free(server_info);
966
967 if (!NT_STATUS_IS_OK(status)) {
968 DEBUG(0, ("create_local_token failed: %s\n",
969 nt_errstr(status)));
970 goto done;
971 }
972
973 talloc_steal(mem_ctx, *session_info);
974
975 done:
976 TALLOC_FREE(tmp_ctx);
977 return status;
978 }
979
980 /****************************************************************************
981 Fake a auth_session_info just from a username (as a
982 session_info structure, with create_local_token() already called on
983 it.
984 ****************************************************************************/
985
986 NTSTATUS make_session_info_from_username(TALLOC_CTX *mem_ctx,
987 const char *username,
988 bool is_guest,
989 struct auth_session_info **session_info)
990 {
991 struct passwd *pwd;
992 NTSTATUS status;
993 struct auth_serversupplied_info *result;
994
995 pwd = Get_Pwnam_alloc(talloc_tos(), username);
996 if (pwd == NULL) {
997 return NT_STATUS_NO_SUCH_USER;
998 }
999
1000 status = make_server_info_pw(&result, pwd->pw_name, pwd);
1001
1002 if (!NT_STATUS_IS_OK(status)) {
1003 return status;
1004 }
1005
1006 result->nss_token = true;
1007 result->guest = is_guest;
1008
1009 /* Now turn the server_info into a session_info with the full token etc */
1010 status = create_local_token(mem_ctx, result, NULL, pwd->pw_name, session_info);
1011 TALLOC_FREE(result);
1012 TALLOC_FREE(pwd);
1013
1014 return status;
1015 }
1016
1017 /* This function MUST only used to create the cached server_info for
1018 * guest.
1019 *
1020 * This is a lossy conversion. Variables known to be lost so far
1021 * include:
1022 *
1023 * - nss_token (not needed because the only read doesn't happen
1024 * for the GUEST user, as this routine populates ->security_token
1025 *
1026 * - extra (not needed because the guest account must have valid RIDs per the output of get_guest_info3())
1027 *
1028 * - The 'server_info' parameter allows the missing 'info3' to be copied across.
1029 */
1030 static struct auth_serversupplied_info *copy_session_info_serverinfo_guest(TALLOC_CTX *mem_ctx,
1031 const struct auth_session_info *src,
1032 struct auth_serversupplied_info *server_info)
1033 {
1034 struct auth_serversupplied_info *dst;
1035
1036 dst = make_server_info(mem_ctx);
1037 if (dst == NULL) {
1038 return NULL;
1039 }
1040
1041 /* This element must be provided to convert back to an auth_serversupplied_info */
1042 SMB_ASSERT(src->unix_info);
1043
1044 dst->guest = true;
1045 dst->system = false;
1046
1047 /* This element must be provided to convert back to an
1048 * auth_serversupplied_info. This needs to be from the
1049 * auth_session_info because the group values in particular
1050 * may change during create_local_token() processing */
1051 SMB_ASSERT(src->unix_token);
1052 dst->utok.uid = src->unix_token->uid;
1053 dst->utok.gid = src->unix_token->gid;
1054 dst->utok.ngroups = src->unix_token->ngroups;
1055 if (src->unix_token->ngroups != 0) {
1056 dst->utok.groups = (gid_t *)talloc_memdup(
1057 dst, src->unix_token->groups,
1058 sizeof(gid_t)*dst->utok.ngroups);
1059 } else {
1060 dst->utok.groups = NULL;
1061 }
1062
1063 /* We must have a security_token as otherwise the lossy
1064 * conversion without nss_token would cause create_local_token
1065 * to take the wrong path */
1066 SMB_ASSERT(src->security_token);
1067
1068 dst->security_token = dup_nt_token(dst, src->security_token);
1069 if (!dst->security_token) {
1070 TALLOC_FREE(dst);
1071 return NULL;
1072 }
1073
1074 dst->session_key = data_blob_talloc( dst, src->session_key.data,
1075 src->session_key.length);
1076
1077 /* This is OK because this functions is only used for the
1078 * GUEST account, which has all-zero keys for both values */
1079 dst->lm_session_key = data_blob_talloc(dst, src->session_key.data,
1080 src->session_key.length);
1081
1082 dst->info3 = copy_netr_SamInfo3(dst, server_info->info3);
1083 if (!dst->info3) {
1084 TALLOC_FREE(dst);
1085 return NULL;
1086 }
1087
1088 dst->unix_name = talloc_strdup(dst, src->unix_info->unix_name);
1089 if (!dst->unix_name) {
1090 TALLOC_FREE(dst);
1091 return NULL;
1092 }
1093
1094 return dst;
1095 }
1096
1097 struct auth_session_info *copy_session_info(TALLOC_CTX *mem_ctx,
1098 const struct auth_session_info *src)
1099 {
1100 struct auth_session_info *dst;
1101 DATA_BLOB blob;
1102 enum ndr_err_code ndr_err;
1103
1104 ndr_err = ndr_push_struct_blob(
1105 &blob, talloc_tos(), src,
1106 (ndr_push_flags_fn_t)ndr_push_auth_session_info);
1107 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1108 DEBUG(0, ("copy_session_info(): ndr_push_auth_session_info failed: "
1109 "%s\n", ndr_errstr(ndr_err)));
1110 return NULL;
1111 }
1112
1113 dst = talloc(mem_ctx, struct auth_session_info);
1114 if (dst == NULL) {
1115 DEBUG(0, ("talloc failed\n"));
1116 TALLOC_FREE(blob.data);
1117 return NULL;
1118 }
1119
1120 ndr_err = ndr_pull_struct_blob(
1121 &blob, dst, dst,
1122 (ndr_pull_flags_fn_t)ndr_pull_auth_session_info);
1123 TALLOC_FREE(blob.data);
1124
1125 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1126 DEBUG(0, ("copy_session_info(): ndr_pull_auth_session_info failed: "
1127 "%s\n", ndr_errstr(ndr_err)));
1128 TALLOC_FREE(dst);
1129 return NULL;
1130 }
1131
1132 return dst;
1133 }
1134
1135 /*
1136 * Set a new session key. Used in the rpc server where we have to override the
1137 * SMB level session key with SystemLibraryDTC
1138 */
1139
1140 bool session_info_set_session_key(struct auth_session_info *info,
1141 DATA_BLOB session_key)
1142 {
1143 TALLOC_FREE(info->session_key.data);
1144
1145 info->session_key = data_blob_talloc(
1146 info, session_key.data, session_key.length);
1147
1148 return (info->session_key.data != NULL);
1149 }
1150
1151 static struct auth_session_info *guest_info = NULL;
1152
1153 static struct auth_serversupplied_info *guest_server_info = NULL;
1154
1155 bool init_guest_info(void)
1156 {
1157 if (guest_info != NULL)
1158 return true;
1159
1160 return NT_STATUS_IS_OK(make_new_session_info_guest(&guest_info, &guest_server_info));
1161 }
1162
1163 NTSTATUS make_server_info_guest(TALLOC_CTX *mem_ctx,
1164 struct auth_serversupplied_info **server_info)
1165 {
1166 /* This is trickier than it would appear to need to be because
1167 * we are trying to avoid certain costly operations when the
1168 * structure is converted to a 'auth_session_info' again in
1169 * create_local_token() */
1170 *server_info = copy_session_info_serverinfo_guest(mem_ctx, guest_info, guest_server_info);
1171 return (*server_info != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
1172 }
1173
1174 NTSTATUS make_session_info_guest(TALLOC_CTX *mem_ctx,
1175 struct auth_session_info **session_info)
1176 {
1177 *session_info = copy_session_info(mem_ctx, guest_info);
1178 return (*session_info != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
1179 }
1180
1181 static struct auth_session_info *system_info = NULL;
1182
1183 NTSTATUS init_system_session_info(void)
1184 {
1185 if (system_info != NULL)
1186 return NT_STATUS_OK;
1187
1188 return make_new_session_info_system(NULL, &system_info);
1189 }
1190
1191 NTSTATUS make_session_info_system(TALLOC_CTX *mem_ctx,
1192 struct auth_session_info **session_info)
1193 {
1194 if (system_info == NULL) return NT_STATUS_UNSUCCESSFUL;
1195 *session_info = copy_session_info(mem_ctx, system_info);
1196 return (*session_info != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
1197 }
1198
1199 const struct auth_session_info *get_session_info_system(void)
1200 {
1201 return system_info;
1202 }
1203
1204 /***************************************************************************
1205 Purely internal function for make_server_info_info3
1206 ***************************************************************************/
1207
1208 static NTSTATUS check_account(TALLOC_CTX *mem_ctx, const char *domain,
1209 const char *username, char **found_username,
1210 struct passwd **pwd,
1211 bool *username_was_mapped)
1212 {
1213 char *orig_dom_user = NULL;
1214 char *dom_user = NULL;
1215 char *lower_username = NULL;
1216 char *real_username = NULL;
1217 struct passwd *passwd;
1218
1219 lower_username = talloc_strdup(mem_ctx, username);
1220 if (!lower_username) {
1221 return NT_STATUS_NO_MEMORY;
1222 }
1223 if (!strlower_m( lower_username )) {
1224 return NT_STATUS_INVALID_PARAMETER;
1225 }
1226
1227 orig_dom_user = talloc_asprintf(mem_ctx,
1228 "%s%c%s",
1229 domain,
1230 *lp_winbind_separator(),
1231 lower_username);
1232 if (!orig_dom_user) {
1233 return NT_STATUS_NO_MEMORY;
1234 }
1235
1236 /* Get the passwd struct. Try to create the account if necessary. */
1237
1238 *username_was_mapped = map_username(mem_ctx, orig_dom_user, &dom_user);
1239 if (!dom_user) {
1240 return NT_STATUS_NO_MEMORY;
1241 }
1242
1243 passwd = smb_getpwnam(mem_ctx, dom_user, &real_username, true );
1244 if (!passwd) {
1245 DEBUG(3, ("Failed to find authenticated user %s via "
1246 "getpwnam(), denying access.\n", dom_user));
1247 return NT_STATUS_NO_SUCH_USER;
1248 }
1249
1250 if (!real_username) {
1251 return NT_STATUS_NO_MEMORY;
1252 }
1253
1254 *pwd = passwd;
1255
1256 /* This is pointless -- there is no support for differing
1257 unix and windows names. Make sure to always store the
1258 one we actually looked up and succeeded. Have I mentioned
1259 why I hate the 'winbind use default domain' parameter?
1260 --jerry */
1261
1262 *found_username = talloc_strdup( mem_ctx, real_username );
1263
1264 return NT_STATUS_OK;
1265 }
1266
1267 /****************************************************************************
1268 Wrapper to allow the getpwnam() call to strip the domain name and
1269 try again in case a local UNIX user is already there. Also run through
1270 the username if we fallback to the username only.
1271 ****************************************************************************/
1272
1273 struct passwd *smb_getpwnam( TALLOC_CTX *mem_ctx, const char *domuser,
1274 char **p_save_username, bool create )
1275 {
1276 struct passwd *pw = NULL;
1277 char *p = NULL;
1278 char *username = NULL;
1279
1280 /* we only save a copy of the username it has been mangled
1281 by winbindd use default domain */
1282 *p_save_username = NULL;
1283
1284 /* don't call map_username() here since it has to be done higher
1285 up the stack so we don't call it multiple times */
1286
1287 username = talloc_strdup(mem_ctx, domuser);
1288 if (!username) {
1289 return NULL;
1290 }
1291
1292 p = strchr_m( username, *lp_winbind_separator() );
1293
1294 /* code for a DOMAIN\user string */
1295
1296 if ( p ) {
1297 pw = Get_Pwnam_alloc( mem_ctx, domuser );
1298 if ( pw ) {
1299 /* make sure we get the case of the username correct */
1300 /* work around 'winbind use default domain = yes' */
1301
1302 if ( lp_winbind_use_default_domain() &&
1303 !strchr_m( pw->pw_name, *lp_winbind_separator() ) ) {
1304 char *domain;
1305
1306 /* split the domain and username into 2 strings */
1307 *p = '\0';
1308 domain = username;
1309
1310 *p_save_username = talloc_asprintf(mem_ctx,
1311 "%s%c%s",
1312 domain,
1313 *lp_winbind_separator(),
1314 pw->pw_name);
1315 if (!*p_save_username) {
1316 TALLOC_FREE(pw);
1317 return NULL;
1318 }
1319 } else {
1320 *p_save_username = talloc_strdup(mem_ctx, pw->pw_name);
1321 }
1322
1323 /* whew -- done! */
1324 return pw;
1325 }
1326
1327 /* setup for lookup of just the username */
1328 /* remember that p and username are overlapping memory */
1329
1330 p++;
1331 username = talloc_strdup(mem_ctx, p);
1332 if (!username) {
1333 return NULL;
1334 }
1335 }
1336
1337 /* just lookup a plain username */
1338
1339 pw = Get_Pwnam_alloc(mem_ctx, username);
1340
1341 /* Create local user if requested but only if winbindd
1342 is not running. We need to protect against cases
1343 where winbindd is failing and then prematurely
1344 creating users in /etc/passwd */
1345
1346 if ( !pw && create && !winbind_ping() ) {
1347 /* Don't add a machine account. */
1348 if (username[strlen(username)-1] == '$')
1349 return NULL;
1350
1351 _smb_create_user(NULL, username, NULL);
1352 pw = Get_Pwnam_alloc(mem_ctx, username);
1353 }
1354
1355 /* one last check for a valid passwd struct */
1356
1357 if (pw) {
1358 *p_save_username = talloc_strdup(mem_ctx, pw->pw_name);
1359 }
1360 return pw;
1361 }
1362
1363 /***************************************************************************
1364 Make a server_info struct from the info3 returned by a domain logon
1365 ***************************************************************************/
1366
1367 NTSTATUS make_server_info_info3(TALLOC_CTX *mem_ctx,
1368 const char *sent_nt_username,
1369 const char *domain,
1370 struct auth_serversupplied_info **server_info,
1371 struct netr_SamInfo3 *info3)
1372 {
1373 static const char zeros[16] = {0, };
1374
1375 NTSTATUS nt_status = NT_STATUS_OK;
1376 char *found_username = NULL;
1377 const char *nt_domain;
1378 const char *nt_username;
1379 struct dom_sid user_sid;
1380 struct dom_sid group_sid;
1381 bool username_was_mapped;
1382 struct passwd *pwd;
1383 struct auth_serversupplied_info *result;
1384
1385 /*
1386 Here is where we should check the list of
1387 trusted domains, and verify that the SID
1388 matches.
1389 */
1390
1391 if (!sid_compose(&user_sid, info3->base.domain_sid, info3->base.rid)) {
1392 return NT_STATUS_INVALID_PARAMETER;
1393 }
1394
1395 if (!sid_compose(&group_sid, info3->base.domain_sid,
1396 info3->base.primary_gid)) {
1397 return NT_STATUS_INVALID_PARAMETER;
1398 }
1399
1400 nt_username = talloc_strdup(mem_ctx, info3->base.account_name.string);
1401 if (!nt_username) {
1402 /* If the server didn't give us one, just use the one we sent
1403 * them */
1404 nt_username = sent_nt_username;
1405 }
1406
1407 nt_domain = talloc_strdup(mem_ctx, info3->base.logon_domain.string);
1408 if (!nt_domain) {
1409 /* If the server didn't give us one, just use the one we sent
1410 * them */
1411 nt_domain = domain;
1412 }
1413
1414 /* If getpwnam() fails try the add user script (2.2.x behavior).
1415
1416 We use the _unmapped_ username here in an attempt to provide
1417 consistent username mapping behavior between kerberos and NTLM[SSP]
1418 authentication in domain mode security. I.E. Username mapping
1419 should be applied to the fully qualified username
1420 (e.g. DOMAIN\user) and not just the login name. Yes this means we
1421 called map_username() unnecessarily in make_user_info_map() but
1422 that is how the current code is designed. Making the change here
1423 is the least disruptive place. -- jerry */
1424
1425 /* this call will try to create the user if necessary */
1426
1427 nt_status = check_account(mem_ctx, nt_domain, sent_nt_username,
1428 &found_username, &pwd,
1429 &username_was_mapped);
1430
1431 if (!NT_STATUS_IS_OK(nt_status)) {
1432 return nt_status;
1433 }
1434
1435 result = make_server_info(NULL);
1436 if (result == NULL) {
1437 DEBUG(4, ("make_server_info failed!\n"));
1438 return NT_STATUS_NO_MEMORY;
1439 }
1440
1441 result->unix_name = talloc_strdup(result, found_username);
1442
1443 /* copy in the info3 */
1444 result->info3 = copy_netr_SamInfo3(result, info3);
1445 if (result->info3 == NULL) {
1446 TALLOC_FREE(result);
1447 return NT_STATUS_NO_MEMORY;
1448 }
1449
1450 /* Fill in the unix info we found on the way */
1451
1452 result->utok.uid = pwd->pw_uid;
1453 result->utok.gid = pwd->pw_gid;
1454
1455 /* ensure we are never given NULL session keys */
1456
1457 if (memcmp(info3->base.key.key, zeros, sizeof(zeros)) == 0) {
1458 result->session_key = data_blob_null;
1459 } else {
1460 result->session_key = data_blob_talloc(
1461 result, info3->base.key.key,
1462 sizeof(info3->base.key.key));
1463 }
1464
1465 if (memcmp(info3->base.LMSessKey.key, zeros, 8) == 0) {
1466 result->lm_session_key = data_blob_null;
1467 } else {
1468 result->lm_session_key = data_blob_talloc(
1469 result, info3->base.LMSessKey.key,
1470 sizeof(info3->base.LMSessKey.key));
1471 }
1472
1473 result->nss_token |= username_was_mapped;
1474
1475 result->guest = (info3->base.user_flags & NETLOGON_GUEST);
1476
1477 *server_info = result;
1478
1479 return NT_STATUS_OK;
1480 }
1481
1482 /*****************************************************************************
1483 Make a server_info struct from the wbcAuthUserInfo returned by a domain logon
1484 ******************************************************************************/
1485
1486 NTSTATUS make_server_info_wbcAuthUserInfo(TALLOC_CTX *mem_ctx,
1487 const char *sent_nt_username,
1488 const char *domain,
1489 const struct wbcAuthUserInfo *info,
1490 struct auth_serversupplied_info **server_info)
1491 {
1492 struct netr_SamInfo3 *info3;
1493
1494 info3 = wbcAuthUserInfo_to_netr_SamInfo3(mem_ctx, info);
1495 if (!info3) {
1496 return NT_STATUS_NO_MEMORY;
1497 }
1498
1499 return make_server_info_info3(mem_ctx,
1500 sent_nt_username, domain,
1501 server_info, info3);
1502 }
1503
1504 /**
1505 * Verify whether or not given domain is trusted.
1506 *
1507 * @param domain_name name of the domain to be verified
1508 * @return true if domain is one of the trusted ones or
1509 * false if otherwise
1510 **/
1511
1512 bool is_trusted_domain(const char* dom_name)
1513 {
1514 struct dom_sid trustdom_sid;
1515 bool ret;
1516
1517 /* no trusted domains for a standalone server */
1518
1519 if ( lp_server_role() == ROLE_STANDALONE )
1520 return false;
1521
1522 if (dom_name == NULL || dom_name[0] == '\0') {
1523 return false;
1524 }
1525
1526 if (strequal(dom_name, get_global_sam_name())) {
1527 return false;
1528 }
1529
1530 /* if we are a DC, then check for a direct trust relationships */
1531
1532 if ( IS_DC ) {
1533 become_root();
1534 DEBUG (5,("is_trusted_domain: Checking for domain trust with "
1535 "[%s]\n", dom_name ));
1536 ret = pdb_get_trusteddom_pw(dom_name, NULL, NULL, NULL);
1537 unbecome_root();
1538 if (ret)
1539 return true;
1540 }
1541 else {
1542 wbcErr result;
1543
1544 /* If winbind is around, ask it */
1545
1546 result = wb_is_trusted_domain(dom_name);
1547
1548 if (result == WBC_ERR_SUCCESS) {
1549 return true;
1550 }
1551
1552 if (result == WBC_ERR_DOMAIN_NOT_FOUND) {
1553 /* winbind could not find the domain */
1554 return false;
1555 }
1556
1557 /* The only other possible result is that winbind is not up
1558 and running. We need to update the trustdom_cache
1559 ourselves */
1560
1561 update_trustdom_cache();
1562 }
1563
1564 /* now the trustdom cache should be available a DC could still
1565 * have a transitive trust so fall back to the cache of trusted
1566 * domains (like a domain member would use */
1567
1568 if ( trustdom_cache_fetch(dom_name, &trustdom_sid) ) {
1569 return true;
1570 }
1571
1572 return false;
1573 }
1574
1575
1576
1577 /*
1578 on a logon error possibly map the error to success if "map to guest"
1579 is set approriately
1580 */
1581 NTSTATUS do_map_to_guest_server_info(NTSTATUS status,
1582 struct auth_serversupplied_info **server_info,
1583 const char *user, const char *domain)
1584 {
1585 user = user ? user : "";
1586 domain = domain ? domain : "";
1587
1588 if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_USER)) {
1589 if ((lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_USER) ||
1590 (lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_PASSWORD)) {
1591 DEBUG(3,("No such user %s [%s] - using guest account\n",
1592 user, domain));
1593 return make_server_info_guest(NULL, server_info);
1594 }
1595 } else if (NT_STATUS_EQUAL(status, NT_STATUS_WRONG_PASSWORD)) {
1596 if (lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_PASSWORD) {
1597 DEBUG(3,("Registered username %s for guest access\n",
1598 user));
1599 return make_server_info_guest(NULL, server_info);
1600 }
1601 }
1602
1603 return status;
1604 }
1605
1606 /*
1607 Extract session key from a session info and return it in a blob
1608 if intent is KEY_USE_16BYTES, truncate it to 16 bytes
1609
1610 See sections 3.2.4.15 and 3.3.4.2 of MS-SMB
1611 Also see https://lists.samba.org/archive/cifs-protocol/2012-January/002265.html for details
1612
1613 Note that returned session_key is referencing the original key, it is supposed to be
1614 short-lived. If original session_info->session_key is gone, the reference will be broken.
1615 */
1616 NTSTATUS session_extract_session_key(const struct auth_session_info *session_info, DATA_BLOB *session_key, enum session_key_use_intent intent)
1617 {
1618
1619 if (session_key == NULL || session_info == NULL) {
1620 return NT_STATUS_INVALID_PARAMETER;
1621 }
1622
1623 if (session_info->session_key.length == 0) {
1624 return NT_STATUS_NO_USER_SESSION_KEY;
1625 }
1626
1627 *session_key = session_info->session_key;
1628 if (intent == KEY_USE_16BYTES) {
1629 session_key->length = MIN(session_info->session_key.length, 16);
1630 }
1631 return NT_STATUS_OK;
1632 }
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