source: branches/samba-3.5.x/source4/auth/sam.c@ 717

Last change on this file since 717 was 414, checked in by Herwig Bauernfeind, 15 years ago

Samba 3.5.0: Initial import
File size: 16.9 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 Password and authentication handling
4 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2004
5 Copyright (C) Gerald Carter 2003
6 Copyright (C) Stefan Metzmacher 2005
7 Copyright (C) Matthias Dieter Wallnöfer 2009
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
21*/
22
23#include "includes.h"
24#include "system/time.h"
25#include "auth/auth.h"
26#include <ldb.h>
27#include "../lib/util/util_ldb.h"
28#include "dsdb/samdb/samdb.h"
29#include "libcli/security/security.h"
30#include "libcli/ldap/ldap.h"
31#include "../libcli/ldap/ldap_ndr.h"
32#include "librpc/gen_ndr/ndr_netlogon.h"
33#include "librpc/gen_ndr/ndr_security.h"
34#include "param/param.h"
35#include "auth/auth_sam.h"
36
37#define KRBTGT_ATTRS \
38 /* required for the krb5 kdc */ \
39 "objectClass", \
40 "sAMAccountName", \
41 "userPrincipalName", \
42 "servicePrincipalName", \
43 "msDS-KeyVersionNumber", \
44 "supplementalCredentials", \
45 \
46 /* passwords */ \
47 "dBCSPwd", \
48 "unicodePwd", \
49 \
50 "userAccountControl", \
51 "objectSid", \
52 \
53 "pwdLastSet", \
54 "accountExpires"
55
56const char *krbtgt_attrs[] = {
57 KRBTGT_ATTRS
58};
59
60const char *server_attrs[] = {
61 KRBTGT_ATTRS
62};
63
64const char *user_attrs[] = {
65 KRBTGT_ATTRS,
66
67 "logonHours",
68
69 /* check 'allowed workstations' */
70 "userWorkstations",
71
72 /* required for server_info, not access control: */
73 "displayName",
74 "scriptPath",
75 "profilePath",
76 "homeDirectory",
77 "homeDrive",
78 "lastLogon",
79 "lastLogoff",
80 "accountExpires",
81 "badPwdCount",
82 "logonCount",
83 "primaryGroupID",
84 "memberOf",
85 NULL,
86};
87
88/****************************************************************************
89 Check if a user is allowed to logon at this time. Note this is the
90 servers local time, as logon hours are just specified as a weekly
91 bitmask.
92****************************************************************************/
93
94static bool logon_hours_ok(struct ldb_message *msg, const char *name_for_logs)
95{
96 /* In logon hours first bit is Sunday from 12AM to 1AM */
97 const struct ldb_val *hours;
98 struct tm *utctime;
99 time_t lasttime;
100 const char *asct;
101 uint8_t bitmask, bitpos;
102
103 hours = ldb_msg_find_ldb_val(msg, "logonHours");
104 if (!hours) {
105 DEBUG(5,("logon_hours_ok: No hours restrictions for user %s\n", name_for_logs));
106 return true;
107 }
108
109 if (hours->length != 168/8) {
110 DEBUG(5,("logon_hours_ok: malformed logon hours restrictions for user %s\n", name_for_logs));
111 return true;
112 }
113
114 lasttime = time(NULL);
115 utctime = gmtime(&lasttime);
116 if (!utctime) {
117 DEBUG(1, ("logon_hours_ok: failed to get gmtime. Failing logon for user %s\n",
118 name_for_logs));
119 return false;
120 }
121
122 /* find the corresponding byte and bit */
123 bitpos = (utctime->tm_wday * 24 + utctime->tm_hour) % 168;
124 bitmask = 1 << (bitpos % 8);
125
126 if (! (hours->data[bitpos/8] & bitmask)) {
127 struct tm *t = localtime(&lasttime);
128 if (!t) {
129 asct = "INVALID TIME";
130 } else {
131 asct = asctime(t);
132 if (!asct) {
133 asct = "INVALID TIME";
134 }
135 }
136
137 DEBUG(1, ("logon_hours_ok: Account for user %s not allowed to "
138 "logon at this time (%s).\n",
139 name_for_logs, asct ));
140 return false;
141 }
142
143 asct = asctime(utctime);
144 DEBUG(5,("logon_hours_ok: user %s allowed to logon at this time (%s)\n",
145 name_for_logs, asct ? asct : "UNKNOWN TIME" ));
146
147 return true;
148}
149
150/****************************************************************************
151 Do a specific test for a SAM_ACCOUNT being vaild for this connection
152 (ie not disabled, expired and the like).
153****************************************************************************/
154_PUBLIC_ NTSTATUS authsam_account_ok(TALLOC_CTX *mem_ctx,
155 struct ldb_context *sam_ctx,
156 uint32_t logon_parameters,
157 struct ldb_dn *domain_dn,
158 struct ldb_message *msg,
159 const char *logon_workstation,
160 const char *name_for_logs,
161 bool allow_domain_trust,
162 bool password_change)
163{
164 uint16_t acct_flags;
165 const char *workstation_list;
166 NTTIME acct_expiry;
167 NTTIME must_change_time;
168
169 NTTIME now;
170 DEBUG(4,("authsam_account_ok: Checking SMB password for user %s\n", name_for_logs));
171
172 acct_flags = samdb_result_acct_flags(sam_ctx, mem_ctx, msg, domain_dn);
173
174 acct_expiry = samdb_result_account_expires(msg);
175
176 /* Check for when we must change this password, taking the
177 * userAccountControl flags into account */
178 must_change_time = samdb_result_force_password_change(sam_ctx, mem_ctx,
179 domain_dn, msg);
180
181 workstation_list = samdb_result_string(msg, "userWorkstations", NULL);
182
183 /* Quit if the account was disabled. */
184 if (acct_flags & ACB_DISABLED) {
185 DEBUG(1,("authsam_account_ok: Account for user '%s' was disabled.\n", name_for_logs));
186 return NT_STATUS_ACCOUNT_DISABLED;
187 }
188
189 /* Quit if the account was locked out. */
190 if (acct_flags & ACB_AUTOLOCK) {
191 DEBUG(1,("authsam_account_ok: Account for user %s was locked out.\n", name_for_logs));
192 return NT_STATUS_ACCOUNT_LOCKED_OUT;
193 }
194
195 /* Test account expire time */
196 unix_to_nt_time(&now, time(NULL));
197 if (now > acct_expiry) {
198 DEBUG(1,("authsam_account_ok: Account for user '%s' has expired.\n", name_for_logs));
199 DEBUG(3,("authsam_account_ok: Account expired at '%s'.\n",
200 nt_time_string(mem_ctx, acct_expiry)));
201 return NT_STATUS_ACCOUNT_EXPIRED;
202 }
203
204 /* check for immediate expiry "must change at next logon" (but not if this is a password change request) */
205 if ((must_change_time == 0) && !password_change) {
206 DEBUG(1,("sam_account_ok: Account for user '%s' password must change!.\n",
207 name_for_logs));
208 return NT_STATUS_PASSWORD_MUST_CHANGE;
209 }
210
211 /* check for expired password (but not if this is a password change request) */
212 if ((must_change_time < now) && !password_change) {
213 DEBUG(1,("sam_account_ok: Account for user '%s' password expired!.\n",
214 name_for_logs));
215 DEBUG(1,("sam_account_ok: Password expired at '%s' unix time.\n",
216 nt_time_string(mem_ctx, must_change_time)));
217 return NT_STATUS_PASSWORD_EXPIRED;
218 }
219
220 /* Test workstation. Workstation list is comma separated. */
221 if (logon_workstation && workstation_list && *workstation_list) {
222 bool invalid_ws = true;
223 int i;
224 const char **workstations = (const char **)str_list_make(mem_ctx, workstation_list, ",");
225
226 for (i = 0; workstations && workstations[i]; i++) {
227 DEBUG(10,("sam_account_ok: checking for workstation match '%s' and '%s'\n",
228 workstations[i], logon_workstation));
229
230 if (strequal(workstations[i], logon_workstation)) {
231 invalid_ws = false;
232 break;
233 }
234 }
235
236 talloc_free(workstations);
237
238 if (invalid_ws) {
239 return NT_STATUS_INVALID_WORKSTATION;
240 }
241 }
242
243 if (!logon_hours_ok(msg, name_for_logs)) {
244 return NT_STATUS_INVALID_LOGON_HOURS;
245 }
246
247 if (!allow_domain_trust) {
248 if (acct_flags & ACB_DOMTRUST) {
249 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", name_for_logs));
250 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
251 }
252 }
253 if (!(logon_parameters & MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT)) {
254 if (acct_flags & ACB_SVRTRUST) {
255 DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", name_for_logs));
256 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
257 }
258 }
259 if (!(logon_parameters & MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)) {
260 /* TODO: this fails with current solaris client. We
261 need to work with Gordon to work out why */
262 if (acct_flags & ACB_WSTRUST) {
263 DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", name_for_logs));
264 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
265 }
266 }
267
268 return NT_STATUS_OK;
269}
270
271/* This function tests if a SID structure "sids" contains the SID "sid" */
272static bool sids_contains_sid(const struct dom_sid **sids, const int num_sids,
273 const struct dom_sid *sid)
274{
275 int i;
276
277 for (i = 0; i < num_sids; i++) {
278 if (dom_sid_equal(sids[i], sid))
279 return true;
280 }
281 return false;
282}
283
284/*
285 * This function generates the transitive closure of a given SID "sid" (it
286 * basically expands nested groups of a SID).
287 * If the SID isn't located in the "res_sids" structure yet and the
288 * "only_childs" flag is negative, we add it to "res_sids".
289 * Then we've always to consider the "memberOf" attributes. We invoke the
290 * function recursively on each item of it with the "only_childs" flag set to
291 * "false".
292 * The "only_childs" flag is particularly useful if you have a user SID and
293 * want to include all his groups (referenced with "memberOf") without his SID
294 * itself.
295 *
296 * At the beginning "res_sids" should reference to a NULL pointer.
297 */
298static NTSTATUS authsam_expand_nested_groups(struct ldb_context *sam_ctx,
299 const struct dom_sid *sid, const bool only_childs,
300 TALLOC_CTX *res_sids_ctx, struct dom_sid ***res_sids,
301 int *num_res_sids)
302{
303 const char * const attrs[] = { "memberOf", NULL };
304 int i, ret;
305 bool already_there;
306 struct ldb_dn *tmp_dn;
307 struct dom_sid *tmp_sid;
308 TALLOC_CTX *tmp_ctx;
309 struct ldb_message **res;
310 NTSTATUS status;
311
312 if (*res_sids == NULL) {
313 *num_res_sids = 0;
314 }
315
316 if (sid == NULL) {
317 return NT_STATUS_OK;
318 }
319
320 already_there = sids_contains_sid((const struct dom_sid**) *res_sids,
321 *num_res_sids, sid);
322 if (already_there) {
323 return NT_STATUS_OK;
324 }
325
326 if (!only_childs) {
327 tmp_sid = dom_sid_dup(res_sids_ctx, sid);
328 NT_STATUS_HAVE_NO_MEMORY(tmp_sid);
329 *res_sids = talloc_realloc(res_sids_ctx, *res_sids,
330 struct dom_sid *, *num_res_sids + 1);
331 NT_STATUS_HAVE_NO_MEMORY(*res_sids);
332 (*res_sids)[*num_res_sids] = tmp_sid;
333 ++(*num_res_sids);
334 }
335
336 tmp_ctx = talloc_new(sam_ctx);
337
338 ret = gendb_search(sam_ctx, tmp_ctx, NULL, &res, attrs,
339 "objectSid=%s", ldap_encode_ndr_dom_sid(tmp_ctx, sid));
340 if (ret != 1) {
341 talloc_free(tmp_ctx);
342 return NT_STATUS_INTERNAL_DB_CORRUPTION;
343 }
344
345 if (res[0]->num_elements == 0) {
346 talloc_free(res);
347 talloc_free(tmp_ctx);
348 return NT_STATUS_OK;
349 }
350
351 for (i = 0; i < res[0]->elements[0].num_values; i++) {
352 tmp_dn = ldb_dn_from_ldb_val(tmp_ctx, sam_ctx,
353 &res[0]->elements[0].values[i]);
354 tmp_sid = samdb_search_dom_sid(sam_ctx, tmp_ctx, tmp_dn,
355 "objectSid", NULL);
356
357 status = authsam_expand_nested_groups(sam_ctx, tmp_sid,
358 false, res_sids_ctx, res_sids, num_res_sids);
359 if (!NT_STATUS_IS_OK(status)) {
360 talloc_free(res);
361 talloc_free(tmp_ctx);
362 return status;
363 }
364 }
365
366 talloc_free(res);
367 talloc_free(tmp_ctx);
368
369 return NT_STATUS_OK;
370}
371
372_PUBLIC_ NTSTATUS authsam_make_server_info(TALLOC_CTX *mem_ctx,
373 struct ldb_context *sam_ctx,
374 const char *netbios_name,
375 const char *domain_name,
376 struct ldb_dn *domain_dn,
377 struct ldb_message *msg,
378 DATA_BLOB user_sess_key,
379 DATA_BLOB lm_sess_key,
380 struct auth_serversupplied_info
381 **_server_info)
382{
383 NTSTATUS status;
384 struct auth_serversupplied_info *server_info;
385 const char *str;
386 struct dom_sid *tmp_sid;
387 /* SIDs for the account and his primary group */
388 struct dom_sid *account_sid;
389 struct dom_sid *primary_group_sid;
390 /* SID structures for the expanded group memberships */
391 struct dom_sid **groupSIDs = NULL, **groupSIDs_2 = NULL;
392 int num_groupSIDs = 0, num_groupSIDs_2 = 0, i;
393 uint32_t userAccountControl;
394
395 server_info = talloc(mem_ctx, struct auth_serversupplied_info);
396 NT_STATUS_HAVE_NO_MEMORY(server_info);
397
398 account_sid = samdb_result_dom_sid(server_info, msg, "objectSid");
399 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(account_sid, server_info);
400
401 primary_group_sid = dom_sid_add_rid(server_info,
402 samdb_domain_sid(sam_ctx),
403 samdb_result_uint(msg, "primaryGroupID", ~0));
404 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(primary_group_sid, server_info);
405
406 /* Expands the primary group */
407 status = authsam_expand_nested_groups(sam_ctx, primary_group_sid, false,
408 server_info, &groupSIDs, &num_groupSIDs);
409 if (!NT_STATUS_IS_OK(status)) {
410 talloc_free(server_info);
411 return status;
412 }
413
414 /* Expands the additional groups */
415 status = authsam_expand_nested_groups(sam_ctx, account_sid, true,
416 server_info, &groupSIDs_2, &num_groupSIDs_2);
417 if (!NT_STATUS_IS_OK(status)) {
418 talloc_free(server_info);
419 return status;
420 }
421
422 /* Merge the two expanded structures (groupSIDs, groupSIDs_2) */
423 for (i = 0; i < num_groupSIDs_2; i++)
424 if (!sids_contains_sid((const struct dom_sid **) groupSIDs,
425 num_groupSIDs, groupSIDs_2[i])) {
426 tmp_sid = dom_sid_dup(server_info, groupSIDs_2[i]);
427 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(tmp_sid, server_info);
428 groupSIDs = talloc_realloc(server_info, groupSIDs,
429 struct dom_sid *, num_groupSIDs + 1);
430 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(groupSIDs,
431 server_info);
432 groupSIDs[num_groupSIDs] = tmp_sid;
433 ++num_groupSIDs;
434 }
435 talloc_free(groupSIDs_2);
436
437 server_info->account_sid = account_sid;
438 server_info->primary_group_sid = primary_group_sid;
439
440 /* DCs also get SID_NT_ENTERPRISE_DCS */
441 userAccountControl = ldb_msg_find_attr_as_uint(msg, "userAccountControl", 0);
442 if (userAccountControl & UF_SERVER_TRUST_ACCOUNT) {
443 groupSIDs = talloc_realloc(server_info, groupSIDs, struct dom_sid *,
444 num_groupSIDs+1);
445 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(groupSIDs, server_info);
446 groupSIDs[num_groupSIDs] = dom_sid_parse_talloc(groupSIDs, SID_NT_ENTERPRISE_DCS);
447 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(groupSIDs[num_groupSIDs], server_info);
448 num_groupSIDs++;
449 }
450
451 server_info->domain_groups = groupSIDs;
452 server_info->n_domain_groups = num_groupSIDs;
453
454 server_info->account_name = talloc_steal(server_info,
455 samdb_result_string(msg, "sAMAccountName", NULL));
456
457 server_info->domain_name = talloc_strdup(server_info, domain_name);
458 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->domain_name,
459 server_info);
460
461 str = samdb_result_string(msg, "displayName", "");
462 server_info->full_name = talloc_strdup(server_info, str);
463 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->full_name, server_info);
464
465 str = samdb_result_string(msg, "scriptPath", "");
466 server_info->logon_script = talloc_strdup(server_info, str);
467 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->logon_script,
468 server_info);
469
470 str = samdb_result_string(msg, "profilePath", "");
471 server_info->profile_path = talloc_strdup(server_info, str);
472 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->profile_path,
473 server_info);
474
475 str = samdb_result_string(msg, "homeDirectory", "");
476 server_info->home_directory = talloc_strdup(server_info, str);
477 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->home_directory,
478 server_info);
479
480 str = samdb_result_string(msg, "homeDrive", "");
481 server_info->home_drive = talloc_strdup(server_info, str);
482 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->home_drive, server_info);
483
484 server_info->logon_server = talloc_strdup(server_info, netbios_name);
485 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->logon_server,
486 server_info);
487
488 server_info->last_logon = samdb_result_nttime(msg, "lastLogon", 0);
489 server_info->last_logoff = samdb_result_last_logoff(msg);
490 server_info->acct_expiry = samdb_result_account_expires(msg);
491 server_info->last_password_change = samdb_result_nttime(msg,
492 "pwdLastSet", 0);
493 server_info->allow_password_change
494 = samdb_result_allow_password_change(sam_ctx, mem_ctx,
495 domain_dn, msg, "pwdLastSet");
496 server_info->force_password_change
497 = samdb_result_force_password_change(sam_ctx, mem_ctx,
498 domain_dn, msg);
499 server_info->logon_count = samdb_result_uint(msg, "logonCount", 0);
500 server_info->bad_password_count = samdb_result_uint(msg, "badPwdCount",
501 0);
502
503 server_info->acct_flags = samdb_result_acct_flags(sam_ctx, mem_ctx,
504 msg, domain_dn);
505
506 server_info->user_session_key = data_blob_talloc_reference(server_info,
507 &user_sess_key);
508 server_info->lm_session_key = data_blob_talloc_reference(server_info,
509 &lm_sess_key);
510
511 server_info->authenticated = true;
512
513 *_server_info = server_info;
514
515 return NT_STATUS_OK;
516}
517
518NTSTATUS sam_get_results_principal(struct ldb_context *sam_ctx,
519 TALLOC_CTX *mem_ctx, const char *principal,
520 const char **attrs,
521 struct ldb_dn **domain_dn,
522 struct ldb_message **msg)
523{
524 struct ldb_dn *user_dn;
525 NTSTATUS nt_status;
526 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
527 int ret;
528
529 if (!tmp_ctx) {
530 return NT_STATUS_NO_MEMORY;
531 }
532
533 nt_status = crack_user_principal_name(sam_ctx, tmp_ctx, principal,
534 &user_dn, domain_dn);
535 if (!NT_STATUS_IS_OK(nt_status)) {
536 talloc_free(tmp_ctx);
537 return nt_status;
538 }
539
540 /* pull the user attributes */
541 ret = gendb_search_single_extended_dn(sam_ctx, tmp_ctx, user_dn,
542 LDB_SCOPE_BASE, msg, attrs, "(objectClass=*)");
543 if (ret != LDB_SUCCESS) {
544 talloc_free(tmp_ctx);
545 return NT_STATUS_INTERNAL_DB_CORRUPTION;
546 }
547 talloc_steal(mem_ctx, *msg);
548 talloc_steal(mem_ctx, *domain_dn);
549 talloc_free(tmp_ctx);
550
551 return NT_STATUS_OK;
552}
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