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s3: Fix a winbind race leading to 100% CPU
[Samba.git] / source3 / auth / auth_util.c
bloba904da445d79f9e654a8d23bc39b464b1159d059
1 /*
2 Unix SMB/CIFS implementation.
3 Authentication utility functions
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Andrew Bartlett 2001
6 Copyright (C) Jeremy Allison 2000-2001
7 Copyright (C) Rafal Szczesniak 2002
8 Copyright (C) Volker Lendecke 2006
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
34 #undef DBGC_CLASS
35 #define DBGC_CLASS DBGC_AUTH
36
37 /****************************************************************************
38 Create a UNIX user on demand.
39 ****************************************************************************/
40
41 static int _smb_create_user(const char *domain, const char *unix_username, const char *homedir)
42 {
43 TALLOC_CTX *ctx = talloc_tos();
44 char *add_script;
45 int ret;
46
47 add_script = talloc_strdup(ctx, lp_adduser_script());
48 if (!add_script || !*add_script) {
49 return -1;
50 }
51 add_script = talloc_all_string_sub(ctx,
52 add_script,
53 "%u",
54 unix_username);
55 if (!add_script) {
56 return -1;
57 }
58 if (domain) {
59 add_script = talloc_all_string_sub(ctx,
60 add_script,
61 "%D",
62 domain);
63 if (!add_script) {
64 return -1;
65 }
66 }
67 if (homedir) {
68 add_script = talloc_all_string_sub(ctx,
69 add_script,
70 "%H",
71 homedir);
72 if (!add_script) {
73 return -1;
74 }
75 }
76 ret = smbrun(add_script,NULL);
77 flush_pwnam_cache();
78 DEBUG(ret ? 0 : 3,
79 ("smb_create_user: Running the command `%s' gave %d\n",
80 add_script,ret));
81 return ret;
82 }
83
84 /****************************************************************************
85 Create an auth_usersupplied_data structure after appropriate mapping.
86 ****************************************************************************/
87
88 NTSTATUS make_user_info_map(struct auth_usersupplied_info **user_info,
89 const char *smb_name,
90 const char *client_domain,
91 const char *workstation_name,
92 DATA_BLOB *lm_pwd,
93 DATA_BLOB *nt_pwd,
94 const struct samr_Password *lm_interactive_pwd,
95 const struct samr_Password *nt_interactive_pwd,
96 const char *plaintext,
97 enum auth_password_state password_state)
98 {
99 const char *domain;
100 NTSTATUS result;
101 bool was_mapped;
102 char *internal_username = NULL;
103
104 was_mapped = map_username(talloc_tos(), smb_name, &internal_username);
105 if (!internal_username) {
106 return NT_STATUS_NO_MEMORY;
107 }
108
109 DEBUG(5, ("Mapping user [%s]\\[%s] from workstation [%s]\n",
110 client_domain, smb_name, workstation_name));
111
112 domain = client_domain;
113
114 /* If you connect to a Windows domain member using a bogus domain name,
115 * the Windows box will map the BOGUS\user to SAMNAME\user. Thus, if
116 * the Windows box is a DC the name will become DOMAIN\user and be
117 * authenticated against AD, if the Windows box is a member server but
118 * not a DC the name will become WORKSTATION\user. A standalone
119 * non-domain member box will also map to WORKSTATION\user.
120 * This also deals with the client passing in a "" domain */
121
122 if (!is_trusted_domain(domain) &&
123 !strequal(domain, my_sam_name()))
124 {
125 if (lp_map_untrusted_to_domain())
126 domain = my_sam_name();
127 else
128 domain = get_global_sam_name();
129 DEBUG(5, ("Mapped domain from [%s] to [%s] for user [%s] from "
130 "workstation [%s]\n",
131 client_domain, domain, smb_name, workstation_name));
132 }
133
134 /* We know that the given domain is trusted (and we are allowing them),
135 * it is our global SAM name, or for legacy behavior it is our
136 * primary domain name */
137
138 result = make_user_info(user_info, smb_name, internal_username,
139 client_domain, domain, workstation_name,
140 lm_pwd, nt_pwd,
141 lm_interactive_pwd, nt_interactive_pwd,
142 plaintext, password_state);
143 if (NT_STATUS_IS_OK(result)) {
144 /* We have tried mapping */
145 (*user_info)->mapped_state = True;
146 /* did we actually map the user to a different name? */
147 (*user_info)->was_mapped = was_mapped;
148 }
149 return result;
150 }
151
152 /****************************************************************************
153 Create an auth_usersupplied_data, making the DATA_BLOBs here.
154 Decrypt and encrypt the passwords.
155 ****************************************************************************/
156
157 bool make_user_info_netlogon_network(struct auth_usersupplied_info **user_info,
158 const char *smb_name,
159 const char *client_domain,
160 const char *workstation_name,
161 uint32 logon_parameters,
162 const uchar *lm_network_pwd,
163 int lm_pwd_len,
164 const uchar *nt_network_pwd,
165 int nt_pwd_len)
166 {
167 bool ret;
168 NTSTATUS status;
169 DATA_BLOB lm_blob = data_blob(lm_network_pwd, lm_pwd_len);
170 DATA_BLOB nt_blob = data_blob(nt_network_pwd, nt_pwd_len);
171
172 status = make_user_info_map(user_info,
173 smb_name, client_domain,
174 workstation_name,
175 lm_pwd_len ? &lm_blob : NULL,
176 nt_pwd_len ? &nt_blob : NULL,
177 NULL, NULL, NULL,
178 AUTH_PASSWORD_RESPONSE);
179
180 if (NT_STATUS_IS_OK(status)) {
181 (*user_info)->logon_parameters = logon_parameters;
182 }
183 ret = NT_STATUS_IS_OK(status) ? True : False;
184
185 data_blob_free(&lm_blob);
186 data_blob_free(&nt_blob);
187 return ret;
188 }
189
190 /****************************************************************************
191 Create an auth_usersupplied_data, making the DATA_BLOBs here.
192 Decrypt and encrypt the passwords.
193 ****************************************************************************/
194
195 bool make_user_info_netlogon_interactive(struct auth_usersupplied_info **user_info,
196 const char *smb_name,
197 const char *client_domain,
198 const char *workstation_name,
199 uint32 logon_parameters,
200 const uchar chal[8],
201 const uchar lm_interactive_pwd[16],
202 const uchar nt_interactive_pwd[16],
203 const uchar *dc_sess_key)
204 {
205 struct samr_Password lm_pwd;
206 struct samr_Password nt_pwd;
207 unsigned char local_lm_response[24];
208 unsigned char local_nt_response[24];
209 unsigned char key[16];
210
211 memcpy(key, dc_sess_key, 16);
212
213 if (lm_interactive_pwd)
214 memcpy(lm_pwd.hash, lm_interactive_pwd, sizeof(lm_pwd.hash));
215
216 if (nt_interactive_pwd)
217 memcpy(nt_pwd.hash, nt_interactive_pwd, sizeof(nt_pwd.hash));
218
219 #ifdef DEBUG_PASSWORD
220 DEBUG(100,("key:"));
221 dump_data(100, key, sizeof(key));
222
223 DEBUG(100,("lm owf password:"));
224 dump_data(100, lm_pwd.hash, sizeof(lm_pwd.hash));
225
226 DEBUG(100,("nt owf password:"));
227 dump_data(100, nt_pwd.hash, sizeof(nt_pwd.hash));
228 #endif
229
230 if (lm_interactive_pwd)
231 arcfour_crypt(lm_pwd.hash, key, sizeof(lm_pwd.hash));
232
233 if (nt_interactive_pwd)
234 arcfour_crypt(nt_pwd.hash, key, sizeof(nt_pwd.hash));
235
236 #ifdef DEBUG_PASSWORD
237 DEBUG(100,("decrypt of lm owf password:"));
238 dump_data(100, lm_pwd.hash, sizeof(lm_pwd));
239
240 DEBUG(100,("decrypt of nt owf password:"));
241 dump_data(100, nt_pwd.hash, sizeof(nt_pwd));
242 #endif
243
244 if (lm_interactive_pwd)
245 SMBOWFencrypt(lm_pwd.hash, chal,
246 local_lm_response);
247
248 if (nt_interactive_pwd)
249 SMBOWFencrypt(nt_pwd.hash, chal,
250 local_nt_response);
251
252 /* Password info paranoia */
253 ZERO_STRUCT(key);
254
255 {
256 bool ret;
257 NTSTATUS nt_status;
258 DATA_BLOB local_lm_blob;
259 DATA_BLOB local_nt_blob;
260
261 if (lm_interactive_pwd) {
262 local_lm_blob = data_blob(local_lm_response,
263 sizeof(local_lm_response));
264 }
265
266 if (nt_interactive_pwd) {
267 local_nt_blob = data_blob(local_nt_response,
268 sizeof(local_nt_response));
269 }
270
271 nt_status = make_user_info_map(
272 user_info,
273 smb_name, client_domain, workstation_name,
274 lm_interactive_pwd ? &local_lm_blob : NULL,
275 nt_interactive_pwd ? &local_nt_blob : NULL,
276 lm_interactive_pwd ? &lm_pwd : NULL,
277 nt_interactive_pwd ? &nt_pwd : NULL,
278 NULL, AUTH_PASSWORD_HASH);
279
280 if (NT_STATUS_IS_OK(nt_status)) {
281 (*user_info)->logon_parameters = logon_parameters;
282 }
283
284 ret = NT_STATUS_IS_OK(nt_status) ? True : False;
285 data_blob_free(&local_lm_blob);
286 data_blob_free(&local_nt_blob);
287 return ret;
288 }
289 }
290
291
292 /****************************************************************************
293 Create an auth_usersupplied_data structure
294 ****************************************************************************/
295
296 bool make_user_info_for_reply(struct auth_usersupplied_info **user_info,
297 const char *smb_name,
298 const char *client_domain,
299 const uint8 chal[8],
300 DATA_BLOB plaintext_password)
301 {
302
303 DATA_BLOB local_lm_blob;
304 DATA_BLOB local_nt_blob;
305 NTSTATUS ret = NT_STATUS_UNSUCCESSFUL;
306 char *plaintext_password_string;
307 /*
308 * Not encrypted - do so.
309 */
310
311 DEBUG(5,("make_user_info_for_reply: User passwords not in encrypted "
312 "format.\n"));
313 if (plaintext_password.data && plaintext_password.length) {
314 unsigned char local_lm_response[24];
315
316 #ifdef DEBUG_PASSWORD
317 DEBUG(10,("Unencrypted password (len %d):\n",
318 (int)plaintext_password.length));
319 dump_data(100, plaintext_password.data,
320 plaintext_password.length);
321 #endif
322
323 SMBencrypt( (const char *)plaintext_password.data,
324 (const uchar*)chal, local_lm_response);
325 local_lm_blob = data_blob(local_lm_response, 24);
326
327 /* We can't do an NT hash here, as the password needs to be
328 case insensitive */
329 local_nt_blob = data_blob_null;
330 } else {
331 local_lm_blob = data_blob_null;
332 local_nt_blob = data_blob_null;
333 }
334
335 plaintext_password_string = talloc_strndup(talloc_tos(),
336 (const char *)plaintext_password.data,
337 plaintext_password.length);
338 if (!plaintext_password_string) {
339 return False;
340 }
341
342 ret = make_user_info_map(
343 user_info, smb_name, client_domain,
344 get_remote_machine_name(),
345 local_lm_blob.data ? &local_lm_blob : NULL,
346 local_nt_blob.data ? &local_nt_blob : NULL,
347 NULL, NULL,
348 plaintext_password_string,
349 AUTH_PASSWORD_PLAIN);
350
351 if (plaintext_password_string) {
352 memset(plaintext_password_string, '\0', strlen(plaintext_password_string));
353 talloc_free(plaintext_password_string);
354 }
355
356 data_blob_free(&local_lm_blob);
357 return NT_STATUS_IS_OK(ret) ? True : False;
358 }
359
360 /****************************************************************************
361 Create an auth_usersupplied_data structure
362 ****************************************************************************/
363
364 NTSTATUS make_user_info_for_reply_enc(struct auth_usersupplied_info **user_info,
365 const char *smb_name,
366 const char *client_domain,
367 DATA_BLOB lm_resp, DATA_BLOB nt_resp)
368 {
369 return make_user_info_map(user_info, smb_name,
370 client_domain,
371 get_remote_machine_name(),
372 lm_resp.data && (lm_resp.length > 0) ? &lm_resp : NULL,
373 nt_resp.data && (nt_resp.length > 0) ? &nt_resp : NULL,
374 NULL, NULL, NULL,
375 AUTH_PASSWORD_RESPONSE);
376 }
377
378 /****************************************************************************
379 Create a guest user_info blob, for anonymous authenticaion.
380 ****************************************************************************/
381
382 bool make_user_info_guest(struct auth_usersupplied_info **user_info)
383 {
384 NTSTATUS nt_status;
385
386 nt_status = make_user_info(user_info,
387 "","",
388 "","",
389 "",
390 NULL, NULL,
391 NULL, NULL,
392 NULL,
393 AUTH_PASSWORD_RESPONSE);
394
395 return NT_STATUS_IS_OK(nt_status) ? True : False;
396 }
397
398 static NTSTATUS log_nt_token(struct security_token *token)
399 {
400 TALLOC_CTX *frame = talloc_stackframe();
401 char *command;
402 char *group_sidstr;
403 size_t i;
404
405 if ((lp_log_nt_token_command() == NULL) ||
406 (strlen(lp_log_nt_token_command()) == 0)) {
407 TALLOC_FREE(frame);
408 return NT_STATUS_OK;
409 }
410
411 group_sidstr = talloc_strdup(frame, "");
412 for (i=1; i<token->num_sids; i++) {
413 group_sidstr = talloc_asprintf(
414 frame, "%s %s", group_sidstr,
415 sid_string_talloc(frame, &token->sids[i]));
416 }
417
418 command = talloc_string_sub(
419 frame, lp_log_nt_token_command(),
420 "%s", sid_string_talloc(frame, &token->sids[0]));
421 command = talloc_string_sub(frame, command, "%t", group_sidstr);
422
423 if (command == NULL) {
424 TALLOC_FREE(frame);
425 return NT_STATUS_NO_MEMORY;
426 }
427
428 DEBUG(8, ("running command: [%s]\n", command));
429 if (smbrun(command, NULL) != 0) {
430 DEBUG(0, ("Could not log NT token\n"));
431 TALLOC_FREE(frame);
432 return NT_STATUS_ACCESS_DENIED;
433 }
434
435 TALLOC_FREE(frame);
436 return NT_STATUS_OK;
437 }
438
439 /*
440 * Create the token to use from server_info->info3 and
441 * server_info->sids (the info3/sam groups). Find the unix gids.
442 */
443
444 NTSTATUS create_local_token(struct auth_serversupplied_info *server_info)
445 {
446 struct security_token *t;
447 NTSTATUS status;
448 size_t i;
449 struct dom_sid tmp_sid;
450 struct wbcUnixId *ids;
451
452 /*
453 * If winbind is not around, we can not make much use of the SIDs the
454 * domain controller provided us with. Likewise if the user name was
455 * mapped to some local unix user.
456 */
457
458 if (((lp_server_role() == ROLE_DOMAIN_MEMBER) && !winbind_ping()) ||
459 (server_info->nss_token)) {
460 status = create_token_from_username(server_info,
461 server_info->unix_name,
462 server_info->guest,
463 &server_info->utok.uid,
464 &server_info->utok.gid,
465 &server_info->unix_name,
466 &server_info->security_token);
467
468 } else {
469 status = create_local_nt_token_from_info3(server_info,
470 server_info->guest,
471 server_info->info3,
472 &server_info->extra,
473 &server_info->security_token);
474 }
475
476 if (!NT_STATUS_IS_OK(status)) {
477 return status;
478 }
479
480 /* Convert the SIDs to gids. */
481
482 server_info->utok.ngroups = 0;
483 server_info->utok.groups = NULL;
484
485 t = server_info->security_token;
486
487 ids = TALLOC_ARRAY(talloc_tos(), struct wbcUnixId,
488 t->num_sids);
489 if (ids == NULL) {
490 return NT_STATUS_NO_MEMORY;
491 }
492
493 if (!sids_to_unix_ids(t->sids, t->num_sids, ids)) {
494 TALLOC_FREE(ids);
495 return NT_STATUS_NO_MEMORY;
496 }
497
498 /* Start at index 1, where the groups start. */
499
500 for (i=1; i<t->num_sids; i++) {
501
502 if (ids[i].type != WBC_ID_TYPE_GID) {
503 DEBUG(10, ("Could not convert SID %s to gid, "
504 "ignoring it\n",
505 sid_string_dbg(&t->sids[i])));
506 continue;
507 }
508 if (!add_gid_to_array_unique(server_info, ids[i].id.gid,
509 &server_info->utok.groups,
510 &server_info->utok.ngroups)) {
511 return NT_STATUS_NO_MEMORY;
512 }
513 }
514
515 /*
516 * Add the "Unix Group" SID for each gid to catch mapped groups
517 * and their Unix equivalent. This is to solve the backwards
518 * compatibility problem of 'valid users = +ntadmin' where
519 * ntadmin has been paired with "Domain Admins" in the group
520 * mapping table. Otherwise smb.conf would need to be changed
521 * to 'valid user = "Domain Admins"'. --jerry
522 *
523 * For consistency we also add the "Unix User" SID,
524 * so that the complete unix token is represented within
525 * the nt token.
526 */
527
528 uid_to_unix_users_sid(server_info->utok.uid, &tmp_sid);
529
530 add_sid_to_array_unique(server_info->security_token, &tmp_sid,
531 &server_info->security_token->sids,
532 &server_info->security_token->num_sids);
533
534 for ( i=0; i<server_info->utok.ngroups; i++ ) {
535 gid_to_unix_groups_sid(server_info->utok.groups[i], &tmp_sid);
536 add_sid_to_array_unique(server_info->security_token, &tmp_sid,
537 &server_info->security_token->sids,
538 &server_info->security_token->num_sids);
539 }
540
541 security_token_debug(DBGC_AUTH, 10, server_info->security_token);
542 debug_unix_user_token(DBGC_AUTH, 10,
543 server_info->utok.uid,
544 server_info->utok.gid,
545 server_info->utok.ngroups,
546 server_info->utok.groups);
547
548 status = log_nt_token(server_info->security_token);
549 return status;
550 }
551
552 /***************************************************************************
553 Make (and fill) a server_info struct from a 'struct passwd' by conversion
554 to a struct samu
555 ***************************************************************************/
556
557 NTSTATUS make_server_info_pw(struct auth_serversupplied_info **server_info,
558 char *unix_username,
559 struct passwd *pwd)
560 {
561 NTSTATUS status;
562 struct samu *sampass = NULL;
563 char *qualified_name = NULL;
564 TALLOC_CTX *mem_ctx = NULL;
565 struct dom_sid u_sid;
566 enum lsa_SidType type;
567 struct auth_serversupplied_info *result;
568
569 /*
570 * The SID returned in server_info->sam_account is based
571 * on our SAM sid even though for a pure UNIX account this should
572 * not be the case as it doesn't really exist in the SAM db.
573 * This causes lookups on "[in]valid users" to fail as they
574 * will lookup this name as a "Unix User" SID to check against
575 * the user token. Fix this by adding the "Unix User"\unix_username
576 * SID to the sid array. The correct fix should probably be
577 * changing the server_info->sam_account user SID to be a
578 * S-1-22 Unix SID, but this might break old configs where
579 * plaintext passwords were used with no SAM backend.
580 */
581
582 mem_ctx = talloc_init("make_server_info_pw_tmp");
583 if (!mem_ctx) {
584 return NT_STATUS_NO_MEMORY;
585 }
586
587 qualified_name = talloc_asprintf(mem_ctx, "%s\\%s",
588 unix_users_domain_name(),
589 unix_username );
590 if (!qualified_name) {
591 TALLOC_FREE(mem_ctx);
592 return NT_STATUS_NO_MEMORY;
593 }
594
595 if (!lookup_name(mem_ctx, qualified_name, LOOKUP_NAME_ALL,
596 NULL, NULL,
597 &u_sid, &type)) {
598 TALLOC_FREE(mem_ctx);
599 return NT_STATUS_NO_SUCH_USER;
600 }
601
602 TALLOC_FREE(mem_ctx);
603
604 if (type != SID_NAME_USER) {
605 return NT_STATUS_NO_SUCH_USER;
606 }
607
608 if ( !(sampass = samu_new( NULL )) ) {
609 return NT_STATUS_NO_MEMORY;
610 }
611
612 status = samu_set_unix( sampass, pwd );
613 if (!NT_STATUS_IS_OK(status)) {
614 return status;
615 }
616
617 /* In pathological cases the above call can set the account
618 * name to the DOMAIN\username form. Reset the account name
619 * using unix_username */
620 pdb_set_username(sampass, unix_username, PDB_SET);
621
622 /* set the user sid to be the calculated u_sid */
623 pdb_set_user_sid(sampass, &u_sid, PDB_SET);
624
625 result = make_server_info(NULL);
626 if (result == NULL) {
627 TALLOC_FREE(sampass);
628 return NT_STATUS_NO_MEMORY;
629 }
630
631 status = samu_to_SamInfo3(result, sampass, global_myname(),
632 &result->info3, &result->extra);
633 TALLOC_FREE(sampass);
634 if (!NT_STATUS_IS_OK(status)) {
635 DEBUG(10, ("Failed to convert samu to info3: %s\n",
636 nt_errstr(status)));
637 TALLOC_FREE(result);
638 return status;
639 }
640
641 result->unix_name = talloc_strdup(result, unix_username);
642 result->sanitized_username = sanitize_username(result, unix_username);
643
644 if ((result->unix_name == NULL)
645 || (result->sanitized_username == NULL)) {
646 TALLOC_FREE(result);
647 return NT_STATUS_NO_MEMORY;
648 }
649
650 result->utok.uid = pwd->pw_uid;
651 result->utok.gid = pwd->pw_gid;
652
653 *server_info = result;
654
655 return NT_STATUS_OK;
656 }
657
658 static NTSTATUS get_guest_info3(TALLOC_CTX *mem_ctx,
659 struct netr_SamInfo3 *info3)
660 {
661 const char *guest_account = lp_guestaccount();
662 struct dom_sid domain_sid;
663 struct passwd *pwd;
664 const char *tmp;
665
666 pwd = Get_Pwnam_alloc(mem_ctx, guest_account);
667 if (pwd == NULL) {
668 DEBUG(0,("SamInfo3_for_guest: Unable to locate guest "
669 "account [%s]!\n", guest_account));
670 return NT_STATUS_NO_SUCH_USER;
671 }
672
673 /* Set acount name */
674 tmp = talloc_strdup(mem_ctx, pwd->pw_name);
675 if (tmp == NULL) {
676 return NT_STATUS_NO_MEMORY;
677 }
678 init_lsa_String(&info3->base.account_name, tmp);
679
680 /* Set domain name */
681 tmp = talloc_strdup(mem_ctx, get_global_sam_name());
682 if (tmp == NULL) {
683 return NT_STATUS_NO_MEMORY;
684 }
685 init_lsa_StringLarge(&info3->base.domain, tmp);
686
687 /* Domain sid */
688 sid_copy(&domain_sid, get_global_sam_sid());
689
690 info3->base.domain_sid = dom_sid_dup(mem_ctx, &domain_sid);
691 if (info3->base.domain_sid == NULL) {
692 return NT_STATUS_NO_MEMORY;
693 }
694
695 /* Guest rid */
696 info3->base.rid = DOMAIN_RID_GUEST;
697
698 /* Primary gid */
699 info3->base.primary_gid = BUILTIN_RID_GUESTS;
700
701 TALLOC_FREE(pwd);
702 return NT_STATUS_OK;
703 }
704
705 /***************************************************************************
706 Make (and fill) a user_info struct for a guest login.
707 This *must* succeed for smbd to start. If there is no mapping entry for
708 the guest gid, then create one.
709 ***************************************************************************/
710
711 static NTSTATUS make_new_server_info_guest(struct auth_serversupplied_info **server_info)
712 {
713 static const char zeros[16] = {0};
714 const char *guest_account = lp_guestaccount();
715 const char *domain = global_myname();
716 struct netr_SamInfo3 info3;
717 TALLOC_CTX *tmp_ctx;
718 NTSTATUS status;
719 fstring tmp;
720
721 tmp_ctx = talloc_stackframe();
722 if (tmp_ctx == NULL) {
723 return NT_STATUS_NO_MEMORY;
724 }
725
726 ZERO_STRUCT(info3);
727
728 status = get_guest_info3(tmp_ctx, &info3);
729 if (!NT_STATUS_IS_OK(status)) {
730 goto done;
731 }
732
733 status = make_server_info_info3(tmp_ctx,
734 guest_account,
735 domain,
736 server_info,
737 &info3);
738 if (!NT_STATUS_IS_OK(status)) {
739 goto done;
740 }
741
742 (*server_info)->guest = True;
743
744 status = create_local_token(*server_info);
745 if (!NT_STATUS_IS_OK(status)) {
746 DEBUG(10, ("create_local_token failed: %s\n",
747 nt_errstr(status)));
748 goto done;
749 }
750
751 /* annoying, but the Guest really does have a session key, and it is
752 all zeros! */
753 (*server_info)->user_session_key = data_blob(zeros, sizeof(zeros));
754 (*server_info)->lm_session_key = data_blob(zeros, sizeof(zeros));
755
756 alpha_strcpy(tmp, (*server_info)->info3->base.account_name.string,
757 ". _-$", sizeof(tmp));
758 (*server_info)->sanitized_username = talloc_strdup(*server_info, tmp);
759
760 status = NT_STATUS_OK;
761 done:
762 TALLOC_FREE(tmp_ctx);
763 return NT_STATUS_OK;
764 }
765
766 /***************************************************************************
767 Make (and fill) a auth_session_info struct for a system user login.
768 This *must* succeed for smbd to start.
769 ***************************************************************************/
770
771 static NTSTATUS make_new_session_info_system(TALLOC_CTX *mem_ctx,
772 struct auth_serversupplied_info **session_info)
773 {
774 struct passwd *pwd;
775 NTSTATUS status;
776
777 pwd = getpwuid_alloc(mem_ctx, sec_initial_uid());
778 if (pwd == NULL) {
779 return NT_STATUS_NO_SUCH_USER;
780 }
781
782 status = make_serverinfo_from_username(mem_ctx,
783 pwd->pw_name,
784 false,
785 session_info);
786 TALLOC_FREE(pwd);
787 if (!NT_STATUS_IS_OK(status)) {
788 return status;
789 }
790
791 (*session_info)->system = true;
792
793 status = add_sid_to_array_unique((*session_info)->security_token->sids,
794 &global_sid_System,
795 &(*session_info)->security_token->sids,
796 &(*session_info)->security_token->num_sids);
797 if (!NT_STATUS_IS_OK(status)) {
798 TALLOC_FREE((*session_info));
799 return status;
800 }
801
802 return NT_STATUS_OK;
803 }
804
805 /****************************************************************************
806 Fake a auth_serversupplied_info just from a username
807 ****************************************************************************/
808
809 NTSTATUS make_serverinfo_from_username(TALLOC_CTX *mem_ctx,
810 const char *username,
811 bool is_guest,
812 struct auth_serversupplied_info **presult)
813 {
814 struct auth_serversupplied_info *result;
815 struct passwd *pwd;
816 NTSTATUS status;
817
818 pwd = Get_Pwnam_alloc(talloc_tos(), username);
819 if (pwd == NULL) {
820 return NT_STATUS_NO_SUCH_USER;
821 }
822
823 status = make_server_info_pw(&result, pwd->pw_name, pwd);
824
825 TALLOC_FREE(pwd);
826
827 if (!NT_STATUS_IS_OK(status)) {
828 return status;
829 }
830
831 result->nss_token = true;
832 result->guest = is_guest;
833
834 status = create_local_token(result);
835
836 if (!NT_STATUS_IS_OK(status)) {
837 TALLOC_FREE(result);
838 return status;
839 }
840
841 *presult = talloc_steal(mem_ctx, result);
842 return NT_STATUS_OK;
843 }
844
845
846 struct auth_serversupplied_info *copy_serverinfo(TALLOC_CTX *mem_ctx,
847 const struct auth_serversupplied_info *src)
848 {
849 struct auth_serversupplied_info *dst;
850
851 dst = make_server_info(mem_ctx);
852 if (dst == NULL) {
853 return NULL;
854 }
855
856 dst->guest = src->guest;
857 dst->system = src->system;
858 dst->utok.uid = src->utok.uid;
859 dst->utok.gid = src->utok.gid;
860 dst->utok.ngroups = src->utok.ngroups;
861 if (src->utok.ngroups != 0) {
862 dst->utok.groups = (gid_t *)TALLOC_MEMDUP(
863 dst, src->utok.groups,
864 sizeof(gid_t)*dst->utok.ngroups);
865 } else {
866 dst->utok.groups = NULL;
867 }
868
869 if (src->security_token) {
870 dst->security_token = dup_nt_token(dst, src->security_token);
871 if (!dst->security_token) {
872 TALLOC_FREE(dst);
873 return NULL;
874 }
875 }
876
877 dst->user_session_key = data_blob_talloc( dst, src->user_session_key.data,
878 src->user_session_key.length);
879
880 dst->lm_session_key = data_blob_talloc(dst, src->lm_session_key.data,
881 src->lm_session_key.length);
882
883 dst->info3 = copy_netr_SamInfo3(dst, src->info3);
884 if (!dst->info3) {
885 TALLOC_FREE(dst);
886 return NULL;
887 }
888 dst->extra = src->extra;
889
890 dst->unix_name = talloc_strdup(dst, src->unix_name);
891 if (!dst->unix_name) {
892 TALLOC_FREE(dst);
893 return NULL;
894 }
895
896 dst->sanitized_username = talloc_strdup(dst, src->sanitized_username);
897 if (!dst->sanitized_username) {
898 TALLOC_FREE(dst);
899 return NULL;
900 }
901
902 return dst;
903 }
904
905 /*
906 * Set a new session key. Used in the rpc server where we have to override the
907 * SMB level session key with SystemLibraryDTC
908 */
909
910 bool session_info_set_session_key(struct auth_serversupplied_info *info,
911 DATA_BLOB session_key)
912 {
913 TALLOC_FREE(info->user_session_key.data);
914
915 info->user_session_key = data_blob_talloc(
916 info, session_key.data, session_key.length);
917
918 return (info->user_session_key.data != NULL);
919 }
920
921 static struct auth_serversupplied_info *guest_info = NULL;
922
923 bool init_guest_info(void)
924 {
925 if (guest_info != NULL)
926 return True;
927
928 return NT_STATUS_IS_OK(make_new_server_info_guest(&guest_info));
929 }
930
931 NTSTATUS make_server_info_guest(TALLOC_CTX *mem_ctx,
932 struct auth_serversupplied_info **server_info)
933 {
934 *server_info = copy_serverinfo(mem_ctx, guest_info);
935 return (*server_info != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
936 }
937
938 static struct auth_serversupplied_info *system_info = NULL;
939
940 NTSTATUS init_system_info(void)
941 {
942 if (system_info != NULL)
943 return NT_STATUS_OK;
944
945 return make_new_session_info_system(NULL, &system_info);
946 }
947
948 NTSTATUS make_session_info_system(TALLOC_CTX *mem_ctx,
949 struct auth_serversupplied_info **session_info)
950 {
951 if (system_info == NULL) return NT_STATUS_UNSUCCESSFUL;
952 *session_info = copy_serverinfo(mem_ctx, system_info);
953 return (*session_info != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
954 }
955
956 const struct auth_serversupplied_info *get_session_info_system(void)
957 {
958 return system_info;
959 }
960
961 bool copy_current_user(struct current_user *dst, struct current_user *src)
962 {
963 gid_t *groups;
964 struct security_token *nt_token;
965
966 groups = (gid_t *)memdup(src->ut.groups,
967 sizeof(gid_t) * src->ut.ngroups);
968 if ((src->ut.ngroups != 0) && (groups == NULL)) {
969 return False;
970 }
971
972 nt_token = dup_nt_token(NULL, src->nt_user_token);
973 if (nt_token == NULL) {
974 SAFE_FREE(groups);
975 return False;
976 }
977
978 dst->conn = src->conn;
979 dst->vuid = src->vuid;
980 dst->ut.uid = src->ut.uid;
981 dst->ut.gid = src->ut.gid;
982 dst->ut.ngroups = src->ut.ngroups;
983 dst->ut.groups = groups;
984 dst->nt_user_token = nt_token;
985 return True;
986 }
987
988 /***************************************************************************
989 Purely internal function for make_server_info_info3
990 ***************************************************************************/
991
992 static NTSTATUS check_account(TALLOC_CTX *mem_ctx, const char *domain,
993 const char *username, char **found_username,
994 struct passwd **pwd,
995 bool *username_was_mapped)
996 {
997 char *orig_dom_user = NULL;
998 char *dom_user = NULL;
999 char *lower_username = NULL;
1000 char *real_username = NULL;
1001 struct passwd *passwd;
1002
1003 lower_username = talloc_strdup(mem_ctx, username);
1004 if (!lower_username) {
1005 return NT_STATUS_NO_MEMORY;
1006 }
1007 strlower_m( lower_username );
1008
1009 orig_dom_user = talloc_asprintf(mem_ctx,
1010 "%s%c%s",
1011 domain,
1012 *lp_winbind_separator(),
1013 lower_username);
1014 if (!orig_dom_user) {
1015 return NT_STATUS_NO_MEMORY;
1016 }
1017
1018 /* Get the passwd struct. Try to create the account if necessary. */
1019
1020 *username_was_mapped = map_username(mem_ctx, orig_dom_user, &dom_user);
1021 if (!dom_user) {
1022 return NT_STATUS_NO_MEMORY;
1023 }
1024
1025 passwd = smb_getpwnam(mem_ctx, dom_user, &real_username, True );
1026 if (!passwd) {
1027 DEBUG(3, ("Failed to find authenticated user %s via "
1028 "getpwnam(), denying access.\n", dom_user));
1029 return NT_STATUS_NO_SUCH_USER;
1030 }
1031
1032 if (!real_username) {
1033 return NT_STATUS_NO_MEMORY;
1034 }
1035
1036 *pwd = passwd;
1037
1038 /* This is pointless -- there is no suport for differing
1039 unix and windows names. Make sure to always store the
1040 one we actually looked up and succeeded. Have I mentioned
1041 why I hate the 'winbind use default domain' parameter?
1042 --jerry */
1043
1044 *found_username = talloc_strdup( mem_ctx, real_username );
1045
1046 return NT_STATUS_OK;
1047 }
1048
1049 /****************************************************************************
1050 Wrapper to allow the getpwnam() call to strip the domain name and
1051 try again in case a local UNIX user is already there. Also run through
1052 the username if we fallback to the username only.
1053 ****************************************************************************/
1054
1055 struct passwd *smb_getpwnam( TALLOC_CTX *mem_ctx, const char *domuser,
1056 char **p_save_username, bool create )
1057 {
1058 struct passwd *pw = NULL;
1059 char *p = NULL;
1060 char *username = NULL;
1061
1062 /* we only save a copy of the username it has been mangled
1063 by winbindd use default domain */
1064 *p_save_username = NULL;
1065
1066 /* don't call map_username() here since it has to be done higher
1067 up the stack so we don't call it multiple times */
1068
1069 username = talloc_strdup(mem_ctx, domuser);
1070 if (!username) {
1071 return NULL;
1072 }
1073
1074 p = strchr_m( username, *lp_winbind_separator() );
1075
1076 /* code for a DOMAIN\user string */
1077
1078 if ( p ) {
1079 pw = Get_Pwnam_alloc( mem_ctx, domuser );
1080 if ( pw ) {
1081 /* make sure we get the case of the username correct */
1082 /* work around 'winbind use default domain = yes' */
1083
1084 if ( !strchr_m( pw->pw_name, *lp_winbind_separator() ) ) {
1085 char *domain;
1086
1087 /* split the domain and username into 2 strings */
1088 *p = '\0';
1089 domain = username;
1090
1091 *p_save_username = talloc_asprintf(mem_ctx,
1092 "%s%c%s",
1093 domain,
1094 *lp_winbind_separator(),
1095 pw->pw_name);
1096 if (!*p_save_username) {
1097 TALLOC_FREE(pw);
1098 return NULL;
1099 }
1100 } else {
1101 *p_save_username = talloc_strdup(mem_ctx, pw->pw_name);
1102 }
1103
1104 /* whew -- done! */
1105 return pw;
1106 }
1107
1108 /* setup for lookup of just the username */
1109 /* remember that p and username are overlapping memory */
1110
1111 p++;
1112 username = talloc_strdup(mem_ctx, p);
1113 if (!username) {
1114 return NULL;
1115 }
1116 }
1117
1118 /* just lookup a plain username */
1119
1120 pw = Get_Pwnam_alloc(mem_ctx, username);
1121
1122 /* Create local user if requested but only if winbindd
1123 is not running. We need to protect against cases
1124 where winbindd is failing and then prematurely
1125 creating users in /etc/passwd */
1126
1127 if ( !pw && create && !winbind_ping() ) {
1128 /* Don't add a machine account. */
1129 if (username[strlen(username)-1] == '$')
1130 return NULL;
1131
1132 _smb_create_user(NULL, username, NULL);
1133 pw = Get_Pwnam_alloc(mem_ctx, username);
1134 }
1135
1136 /* one last check for a valid passwd struct */
1137
1138 if (pw) {
1139 *p_save_username = talloc_strdup(mem_ctx, pw->pw_name);
1140 }
1141 return pw;
1142 }
1143
1144 /***************************************************************************
1145 Make a server_info struct from the info3 returned by a domain logon
1146 ***************************************************************************/
1147
1148 NTSTATUS make_server_info_info3(TALLOC_CTX *mem_ctx,
1149 const char *sent_nt_username,
1150 const char *domain,
1151 struct auth_serversupplied_info **server_info,
1152 struct netr_SamInfo3 *info3)
1153 {
1154 static const char zeros[16] = {0, };
1155
1156 NTSTATUS nt_status = NT_STATUS_OK;
1157 char *found_username = NULL;
1158 const char *nt_domain;
1159 const char *nt_username;
1160 bool username_was_mapped;
1161 struct passwd *pwd;
1162 struct auth_serversupplied_info *result;
1163 struct dom_sid *group_sid;
1164 struct netr_SamInfo3 *i3;
1165
1166 /*
1167 Here is where we should check the list of
1168 trusted domains, and verify that the SID
1169 matches.
1170 */
1171
1172 nt_username = talloc_strdup(mem_ctx, info3->base.account_name.string);
1173 if (!nt_username) {
1174 /* If the server didn't give us one, just use the one we sent
1175 * them */
1176 nt_username = sent_nt_username;
1177 }
1178
1179 nt_domain = talloc_strdup(mem_ctx, info3->base.domain.string);
1180 if (!nt_domain) {
1181 /* If the server didn't give us one, just use the one we sent
1182 * them */
1183 nt_domain = domain;
1184 }
1185
1186 /* If getpwnam() fails try the add user script (2.2.x behavior).
1187
1188 We use the _unmapped_ username here in an attempt to provide
1189 consistent username mapping behavior between kerberos and NTLM[SSP]
1190 authentication in domain mode security. I.E. Username mapping
1191 should be applied to the fully qualified username
1192 (e.g. DOMAIN\user) and not just the login name. Yes this means we
1193 called map_username() unnecessarily in make_user_info_map() but
1194 that is how the current code is designed. Making the change here
1195 is the least disruptive place. -- jerry */
1196
1197 /* this call will try to create the user if necessary */
1198
1199 nt_status = check_account(mem_ctx, nt_domain, sent_nt_username,
1200 &found_username, &pwd,
1201 &username_was_mapped);
1202
1203 if (!NT_STATUS_IS_OK(nt_status)) {
1204 return nt_status;
1205 }
1206
1207 result = make_server_info(NULL);
1208 if (result == NULL) {
1209 DEBUG(4, ("make_server_info failed!\n"));
1210 return NT_STATUS_NO_MEMORY;
1211 }
1212
1213 result->unix_name = talloc_strdup(result, found_username);
1214
1215 result->sanitized_username = sanitize_username(result,
1216 result->unix_name);
1217 if (result->sanitized_username == NULL) {
1218 TALLOC_FREE(result);
1219 return NT_STATUS_NO_MEMORY;
1220 }
1221
1222 /* copy in the info3 */
1223 result->info3 = i3 = copy_netr_SamInfo3(result, info3);
1224 if (result->info3 == NULL) {
1225 TALLOC_FREE(result);
1226 return NT_STATUS_NO_MEMORY;
1227 }
1228
1229 /* Fill in the unix info we found on the way */
1230 result->utok.uid = pwd->pw_uid;
1231 result->utok.gid = pwd->pw_gid;
1232
1233 /* We can't just trust that the primary group sid sent us is something
1234 * we can really use. Obtain the useable sid, and store the original
1235 * one as an additional group if it had to be replaced */
1236 nt_status = get_primary_group_sid(mem_ctx, found_username,
1237 &pwd, &group_sid);
1238 if (!NT_STATUS_IS_OK(nt_status)) {
1239 TALLOC_FREE(result);
1240 return nt_status;
1241 }
1242
1243 /* store and check if it is the same we got originally */
1244 sid_peek_rid(group_sid, &i3->base.primary_gid);
1245 if (i3->base.primary_gid != info3->base.primary_gid) {
1246 uint32_t n = i3->base.groups.count;
1247 /* not the same, store the original as an additional group */
1248 i3->base.groups.rids =
1249 talloc_realloc(i3, i3->base.groups.rids,
1250 struct samr_RidWithAttribute, n + 1);
1251 if (i3->base.groups.rids == NULL) {
1252 TALLOC_FREE(result);
1253 return NT_STATUS_NO_MEMORY;
1254 }
1255 i3->base.groups.rids[n].rid = info3->base.primary_gid;
1256 i3->base.groups.rids[n].attributes = SE_GROUP_ENABLED;
1257 i3->base.groups.count = n + 1;
1258 }
1259
1260 /* ensure we are never given NULL session keys */
1261
1262 if (memcmp(info3->base.key.key, zeros, sizeof(zeros)) == 0) {
1263 result->user_session_key = data_blob_null;
1264 } else {
1265 result->user_session_key = data_blob_talloc(
1266 result, info3->base.key.key,
1267 sizeof(info3->base.key.key));
1268 }
1269
1270 if (memcmp(info3->base.LMSessKey.key, zeros, 8) == 0) {
1271 result->lm_session_key = data_blob_null;
1272 } else {
1273 result->lm_session_key = data_blob_talloc(
1274 result, info3->base.LMSessKey.key,
1275 sizeof(info3->base.LMSessKey.key));
1276 }
1277
1278 result->nss_token |= username_was_mapped;
1279
1280 *server_info = result;
1281
1282 return NT_STATUS_OK;
1283 }
1284
1285 /*****************************************************************************
1286 Make a server_info struct from the wbcAuthUserInfo returned by a domain logon
1287 ******************************************************************************/
1288
1289 NTSTATUS make_server_info_wbcAuthUserInfo(TALLOC_CTX *mem_ctx,
1290 const char *sent_nt_username,
1291 const char *domain,
1292 const struct wbcAuthUserInfo *info,
1293 struct auth_serversupplied_info **server_info)
1294 {
1295 struct netr_SamInfo3 *info3;
1296
1297 info3 = wbcAuthUserInfo_to_netr_SamInfo3(mem_ctx, info);
1298 if (!info3) {
1299 return NT_STATUS_NO_MEMORY;
1300 }
1301
1302 return make_server_info_info3(mem_ctx,
1303 sent_nt_username, domain,
1304 server_info, info3);
1305 }
1306
1307 /**
1308 * Verify whether or not given domain is trusted.
1309 *
1310 * @param domain_name name of the domain to be verified
1311 * @return true if domain is one of the trusted ones or
1312 * false if otherwise
1313 **/
1314
1315 bool is_trusted_domain(const char* dom_name)
1316 {
1317 struct dom_sid trustdom_sid;
1318 bool ret;
1319
1320 /* no trusted domains for a standalone server */
1321
1322 if ( lp_server_role() == ROLE_STANDALONE )
1323 return False;
1324
1325 if (dom_name == NULL || dom_name[0] == '\0') {
1326 return false;
1327 }
1328
1329 if (strequal(dom_name, get_global_sam_name())) {
1330 return false;
1331 }
1332
1333 /* if we are a DC, then check for a direct trust relationships */
1334
1335 if ( IS_DC ) {
1336 become_root();
1337 DEBUG (5,("is_trusted_domain: Checking for domain trust with "
1338 "[%s]\n", dom_name ));
1339 ret = pdb_get_trusteddom_pw(dom_name, NULL, NULL, NULL);
1340 unbecome_root();
1341 if (ret)
1342 return True;
1343 }
1344 else {
1345 wbcErr result;
1346
1347 /* If winbind is around, ask it */
1348
1349 result = wb_is_trusted_domain(dom_name);
1350
1351 if (result == WBC_ERR_SUCCESS) {
1352 return True;
1353 }
1354
1355 if (result == WBC_ERR_DOMAIN_NOT_FOUND) {
1356 /* winbind could not find the domain */
1357 return False;
1358 }
1359
1360 /* The only other possible result is that winbind is not up
1361 and running. We need to update the trustdom_cache
1362 ourselves */
1363
1364 update_trustdom_cache();
1365 }
1366
1367 /* now the trustdom cache should be available a DC could still
1368 * have a transitive trust so fall back to the cache of trusted
1369 * domains (like a domain member would use */
1370
1371 if ( trustdom_cache_fetch(dom_name, &trustdom_sid) ) {
1372 return True;
1373 }
1374
1375 return False;
1376 }
1377
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