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  • Committer: Chuck Short
  • Date: 2010-09-28 20:38:39 UTC
  • Revision ID: zulcss@ubuntu.com-20100928203839-pgjulytsi9ue63x1
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source4/auth/sam.c
 
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
   
 
8
   This program is free software; you can redistribute it and/or modify
 
9
   it under the terms of the GNU General Public License as published by
 
10
   the Free Software Foundation; either version 3 of the License, or
 
11
   (at your option) any later version.
 
12
   
 
13
   This program is distributed in the hope that it will be useful,
 
14
   but WITHOUT ANY WARRANTY; without even the implied warranty of
 
15
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
16
   GNU General Public License for more details.
 
17
   
 
18
   You should have received a copy of the GNU General Public License
 
19
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
20
*/
 
21
 
 
22
#include "includes.h"
 
23
#include "system/time.h"
 
24
#include "auth/auth.h"
 
25
#include <ldb.h>
 
26
#include "../lib/util/util_ldb.h"
 
27
#include "dsdb/samdb/samdb.h"
 
28
#include "libcli/security/security.h"
 
29
#include "libcli/ldap/ldap.h"
 
30
#include "librpc/gen_ndr/ndr_netlogon.h"
 
31
#include "param/param.h"
 
32
#include "auth/auth_sam.h"
 
33
 
 
34
const char *user_attrs[] = {
 
35
        /* required for the krb5 kdc */
 
36
        "objectClass",
 
37
        "sAMAccountName",
 
38
        "userPrincipalName",
 
39
        "servicePrincipalName",
 
40
        "msDS-KeyVersionNumber",
 
41
        "supplementalCredentials",
 
42
 
 
43
        /* passwords */
 
44
        "dBCSPwd", 
 
45
        "unicodePwd",
 
46
 
 
47
        "userAccountControl",
 
48
 
 
49
        "pwdLastSet",
 
50
        "accountExpires",
 
51
        "logonHours",
 
52
        "objectSid",
 
53
 
 
54
        /* check 'allowed workstations' */
 
55
        "userWorkstations",
 
56
                       
 
57
        /* required for server_info, not access control: */
 
58
        "displayName",
 
59
        "scriptPath",
 
60
        "profilePath",
 
61
        "homeDirectory",
 
62
        "homeDrive",
 
63
        "lastLogon",
 
64
        "lastLogoff",
 
65
        "accountExpires",
 
66
        "badPwdCount",
 
67
        "logonCount",
 
68
        "primaryGroupID",
 
69
        NULL,
 
70
};
 
71
 
 
72
const char *domain_ref_attrs[] =  {"nETBIOSName", "nCName", 
 
73
                                   "dnsRoot", "objectClass", NULL};
 
74
 
 
75
/****************************************************************************
 
76
 Check if a user is allowed to logon at this time. Note this is the
 
77
 servers local time, as logon hours are just specified as a weekly
 
78
 bitmask.
 
79
****************************************************************************/
 
80
                                                                                                              
 
81
static bool logon_hours_ok(struct ldb_message *msg, const char *name_for_logs)
 
82
{
 
83
        /* In logon hours first bit is Sunday from 12AM to 1AM */
 
84
        const struct ldb_val *hours;
 
85
        struct tm *utctime;
 
86
        time_t lasttime;
 
87
        const char *asct;
 
88
        uint8_t bitmask, bitpos;
 
89
 
 
90
        hours = ldb_msg_find_ldb_val(msg, "logonHours");
 
91
        if (!hours) {
 
92
                DEBUG(5,("logon_hours_ok: No hours restrictions for user %s\n", name_for_logs));
 
93
                return true;
 
94
        }
 
95
 
 
96
        if (hours->length != 168/8) {
 
97
                DEBUG(5,("logon_hours_ok: malformed logon hours restrictions for user %s\n", name_for_logs));
 
98
                return true;            
 
99
        }
 
100
 
 
101
        lasttime = time(NULL);
 
102
        utctime = gmtime(&lasttime);
 
103
        if (!utctime) {
 
104
                DEBUG(1, ("logon_hours_ok: failed to get gmtime. Failing logon for user %s\n",
 
105
                        name_for_logs));
 
106
                return false;
 
107
        }
 
108
 
 
109
        /* find the corresponding byte and bit */
 
110
        bitpos = (utctime->tm_wday * 24 + utctime->tm_hour) % 168;
 
111
        bitmask = 1 << (bitpos % 8);
 
112
 
 
113
        if (! (hours->data[bitpos/8] & bitmask)) {
 
114
                struct tm *t = localtime(&lasttime);
 
115
                if (!t) {
 
116
                        asct = "INVALID TIME";
 
117
                } else {
 
118
                        asct = asctime(t);
 
119
                        if (!asct) {
 
120
                                asct = "INVALID TIME";
 
121
                        }
 
122
                }
 
123
                
 
124
                DEBUG(1, ("logon_hours_ok: Account for user %s not allowed to "
 
125
                          "logon at this time (%s).\n",
 
126
                          name_for_logs, asct ));
 
127
                return false;
 
128
        }
 
129
 
 
130
        asct = asctime(utctime);
 
131
        DEBUG(5,("logon_hours_ok: user %s allowed to logon at this time (%s)\n",
 
132
                name_for_logs, asct ? asct : "UNKNOWN TIME" ));
 
133
 
 
134
        return true;
 
135
}
 
136
 
 
137
/****************************************************************************
 
138
 Do a specific test for a SAM_ACCOUNT being vaild for this connection 
 
139
 (ie not disabled, expired and the like).
 
140
****************************************************************************/
 
141
_PUBLIC_ NTSTATUS authsam_account_ok(TALLOC_CTX *mem_ctx,
 
142
                            struct ldb_context *sam_ctx,
 
143
                            uint32_t logon_parameters,
 
144
                            struct ldb_message *msg,
 
145
                            struct ldb_message *msg_domain_ref,
 
146
                            const char *logon_workstation,
 
147
                            const char *name_for_logs,
 
148
                            bool allow_domain_trust)
 
149
{
 
150
        uint16_t acct_flags;
 
151
        const char *workstation_list;
 
152
        NTTIME acct_expiry;
 
153
        NTTIME must_change_time;
 
154
 
 
155
        struct ldb_dn *domain_dn = samdb_result_dn(sam_ctx, mem_ctx, msg_domain_ref, "nCName", ldb_dn_new(mem_ctx, sam_ctx, NULL));
 
156
 
 
157
        NTTIME now;
 
158
        DEBUG(4,("authsam_account_ok: Checking SMB password for user %s\n", name_for_logs));
 
159
 
 
160
        acct_flags = samdb_result_acct_flags(sam_ctx, mem_ctx, msg, domain_dn);
 
161
        
 
162
        acct_expiry = samdb_result_account_expires(msg);
 
163
 
 
164
        /* Check for when we must change this password, taking the
 
165
         * userAccountControl flags into account */
 
166
        must_change_time = samdb_result_force_password_change(sam_ctx, mem_ctx, 
 
167
                                                              domain_dn, msg);
 
168
 
 
169
        workstation_list = samdb_result_string(msg, "userWorkstations", NULL);
 
170
 
 
171
        /* Quit if the account was disabled. */
 
172
        if (acct_flags & ACB_DISABLED) {
 
173
                DEBUG(1,("authsam_account_ok: Account for user '%s' was disabled.\n", name_for_logs));
 
174
                return NT_STATUS_ACCOUNT_DISABLED;
 
175
        }
 
176
 
 
177
        /* Quit if the account was locked out. */
 
178
        if (acct_flags & ACB_AUTOLOCK) {
 
179
                DEBUG(1,("authsam_account_ok: Account for user %s was locked out.\n", name_for_logs));
 
180
                return NT_STATUS_ACCOUNT_LOCKED_OUT;
 
181
        }
 
182
 
 
183
        /* Test account expire time */
 
184
        unix_to_nt_time(&now, time(NULL));
 
185
        if (now > acct_expiry) {
 
186
                DEBUG(1,("authsam_account_ok: Account for user '%s' has expired.\n", name_for_logs));
 
187
                DEBUG(3,("authsam_account_ok: Account expired at '%s'.\n", 
 
188
                         nt_time_string(mem_ctx, acct_expiry)));
 
189
                return NT_STATUS_ACCOUNT_EXPIRED;
 
190
        }
 
191
 
 
192
        /* check for immediate expiry "must change at next logon" */
 
193
        if (must_change_time == 0) {
 
194
                DEBUG(1,("sam_account_ok: Account for user '%s' password must change!.\n", 
 
195
                         name_for_logs));
 
196
                return NT_STATUS_PASSWORD_MUST_CHANGE;
 
197
        }
 
198
 
 
199
        /* check for expired password */
 
200
        if (must_change_time < now) {
 
201
                DEBUG(1,("sam_account_ok: Account for user '%s' password expired!.\n", 
 
202
                         name_for_logs));
 
203
                DEBUG(1,("sam_account_ok: Password expired at '%s' unix time.\n", 
 
204
                         nt_time_string(mem_ctx, must_change_time)));
 
205
                return NT_STATUS_PASSWORD_EXPIRED;
 
206
        }
 
207
 
 
208
        /* Test workstation. Workstation list is comma separated. */
 
209
        if (logon_workstation && workstation_list && *workstation_list) {
 
210
                bool invalid_ws = true;
 
211
                int i;
 
212
                const char **workstations = (const char **)str_list_make(mem_ctx, workstation_list, ",");
 
213
                
 
214
                for (i = 0; workstations && workstations[i]; i++) {
 
215
                        DEBUG(10,("sam_account_ok: checking for workstation match '%s' and '%s'\n",
 
216
                                  workstations[i], logon_workstation));
 
217
 
 
218
                        if (strequal(workstations[i], logon_workstation)) {
 
219
                                invalid_ws = false;
 
220
                                break;
 
221
                        }
 
222
                }
 
223
 
 
224
                talloc_free(workstations);
 
225
 
 
226
                if (invalid_ws) {
 
227
                        return NT_STATUS_INVALID_WORKSTATION;
 
228
                }
 
229
        }
 
230
        
 
231
        if (!logon_hours_ok(msg, name_for_logs)) {
 
232
                return NT_STATUS_INVALID_LOGON_HOURS;
 
233
        }
 
234
        
 
235
        if (!allow_domain_trust) {
 
236
                if (acct_flags & ACB_DOMTRUST) {
 
237
                        DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", name_for_logs));
 
238
                        return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
 
239
                }
 
240
        }
 
241
        if (!(logon_parameters & MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT)) {
 
242
                if (acct_flags & ACB_SVRTRUST) {
 
243
                        DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", name_for_logs));
 
244
                        return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
 
245
                }
 
246
        }
 
247
        if (!(logon_parameters & MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)) {
 
248
                if (acct_flags & ACB_WSTRUST) {
 
249
                        DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", name_for_logs));
 
250
                        return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
 
251
                }
 
252
        }
 
253
 
 
254
        return NT_STATUS_OK;
 
255
}
 
256
 
 
257
_PUBLIC_ NTSTATUS authsam_make_server_info(TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
 
258
                                           const char *netbios_name,
 
259
                                           struct ldb_message *msg,
 
260
                                           struct ldb_message *msg_domain_ref,
 
261
                                           DATA_BLOB user_sess_key, DATA_BLOB lm_sess_key,
 
262
                                           struct auth_serversupplied_info **_server_info)
 
263
{
 
264
        struct auth_serversupplied_info *server_info;
 
265
        struct ldb_message **group_msgs;
 
266
        int group_ret;
 
267
        const char *group_attrs[3] = { "sAMAccountType", "objectSid", NULL }; 
 
268
        /* find list of sids */
 
269
        struct dom_sid **groupSIDs = NULL;
 
270
        struct dom_sid *account_sid;
 
271
        struct dom_sid *primary_group_sid;
 
272
        struct ldb_dn *domain_dn;
 
273
        const char *str;
 
274
        struct ldb_dn *ncname;
 
275
        int i;
 
276
        uint_t rid;
 
277
        TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 
278
 
 
279
        group_ret = gendb_search(sam_ctx,
 
280
                                 tmp_ctx, NULL, &group_msgs, group_attrs,
 
281
                                 "(&(member=%s)(sAMAccountType=*))", 
 
282
                                 ldb_dn_get_linearized(msg->dn));
 
283
        if (group_ret == -1) {
 
284
                talloc_free(tmp_ctx);
 
285
                return NT_STATUS_INTERNAL_DB_CORRUPTION;
 
286
        }
 
287
 
 
288
        server_info = talloc(mem_ctx, struct auth_serversupplied_info);
 
289
        NT_STATUS_HAVE_NO_MEMORY(server_info);
 
290
        
 
291
        if (group_ret > 0) {
 
292
                groupSIDs = talloc_array(server_info, struct dom_sid *, group_ret);
 
293
                NT_STATUS_HAVE_NO_MEMORY(groupSIDs);
 
294
        }
 
295
 
 
296
        /* Need to unroll some nested groups, but not aliases */
 
297
        for (i = 0; i < group_ret; i++) {
 
298
                groupSIDs[i] = samdb_result_dom_sid(groupSIDs, 
 
299
                                                    group_msgs[i], "objectSid");
 
300
                NT_STATUS_HAVE_NO_MEMORY(groupSIDs[i]);
 
301
        }
 
302
 
 
303
        talloc_free(tmp_ctx);
 
304
 
 
305
        account_sid = samdb_result_dom_sid(server_info, msg, "objectSid");
 
306
        NT_STATUS_HAVE_NO_MEMORY(account_sid);
 
307
 
 
308
        primary_group_sid = dom_sid_dup(server_info, account_sid);
 
309
        NT_STATUS_HAVE_NO_MEMORY(primary_group_sid);
 
310
 
 
311
        rid = samdb_result_uint(msg, "primaryGroupID", ~0);
 
312
        if (rid == ~0) {
 
313
                if (group_ret > 0) {
 
314
                        primary_group_sid = groupSIDs[0];
 
315
                } else {
 
316
                        primary_group_sid = NULL;
 
317
                }
 
318
        } else {
 
319
                primary_group_sid->sub_auths[primary_group_sid->num_auths-1] = rid;
 
320
        }
 
321
 
 
322
        server_info->account_sid = account_sid;
 
323
        server_info->primary_group_sid = primary_group_sid;
 
324
        
 
325
        server_info->n_domain_groups = group_ret;
 
326
        server_info->domain_groups = groupSIDs;
 
327
 
 
328
        server_info->account_name = talloc_steal(server_info, samdb_result_string(msg, "sAMAccountName", NULL));
 
329
 
 
330
        server_info->domain_name = talloc_steal(server_info, samdb_result_string(msg_domain_ref, "nETBIOSName", NULL));
 
331
 
 
332
        str = samdb_result_string(msg, "displayName", "");
 
333
        server_info->full_name = talloc_strdup(server_info, str);
 
334
        NT_STATUS_HAVE_NO_MEMORY(server_info->full_name);
 
335
 
 
336
        str = samdb_result_string(msg, "scriptPath", "");
 
337
        server_info->logon_script = talloc_strdup(server_info, str);
 
338
        NT_STATUS_HAVE_NO_MEMORY(server_info->logon_script);
 
339
 
 
340
        str = samdb_result_string(msg, "profilePath", "");
 
341
        server_info->profile_path = talloc_strdup(server_info, str);
 
342
        NT_STATUS_HAVE_NO_MEMORY(server_info->profile_path);
 
343
 
 
344
        str = samdb_result_string(msg, "homeDirectory", "");
 
345
        server_info->home_directory = talloc_strdup(server_info, str);
 
346
        NT_STATUS_HAVE_NO_MEMORY(server_info->home_directory);
 
347
 
 
348
        str = samdb_result_string(msg, "homeDrive", "");
 
349
        server_info->home_drive = talloc_strdup(server_info, str);
 
350
        NT_STATUS_HAVE_NO_MEMORY(server_info->home_drive);
 
351
 
 
352
        server_info->logon_server = talloc_strdup(server_info, netbios_name);
 
353
        NT_STATUS_HAVE_NO_MEMORY(server_info->logon_server);
 
354
 
 
355
        server_info->last_logon = samdb_result_nttime(msg, "lastLogon", 0);
 
356
        server_info->last_logoff = samdb_result_nttime(msg, "lastLogoff", 0);
 
357
        server_info->acct_expiry = samdb_result_account_expires(msg);
 
358
        server_info->last_password_change = samdb_result_nttime(msg, "pwdLastSet", 0);
 
359
 
 
360
        ncname = samdb_result_dn(sam_ctx, mem_ctx, msg_domain_ref, "nCName", NULL);
 
361
        if (!ncname) {
 
362
                return NT_STATUS_INTERNAL_DB_CORRUPTION;
 
363
        }
 
364
        server_info->allow_password_change
 
365
                = samdb_result_allow_password_change(sam_ctx, mem_ctx, 
 
366
                                                     ncname, msg, "pwdLastSet");
 
367
        server_info->force_password_change
 
368
                = samdb_result_force_password_change(sam_ctx, mem_ctx, 
 
369
                                                     ncname, msg);
 
370
        
 
371
        server_info->logon_count = samdb_result_uint(msg, "logonCount", 0);
 
372
        server_info->bad_password_count = samdb_result_uint(msg, "badPwdCount", 0);
 
373
 
 
374
        domain_dn = samdb_result_dn(sam_ctx, mem_ctx, msg_domain_ref, "nCName", NULL);
 
375
 
 
376
        server_info->acct_flags = samdb_result_acct_flags(sam_ctx, mem_ctx, 
 
377
                                                          msg, domain_dn);
 
378
 
 
379
        server_info->user_session_key = user_sess_key;
 
380
        server_info->lm_session_key = lm_sess_key;
 
381
 
 
382
        server_info->authenticated = true;
 
383
 
 
384
        *_server_info = server_info;
 
385
 
 
386
        return NT_STATUS_OK;
 
387
}
 
388
 
 
389
NTSTATUS sam_get_results_principal(struct ldb_context *sam_ctx,
 
390
                                   TALLOC_CTX *mem_ctx, const char *principal,
 
391
                                   struct ldb_message ***msgs,
 
392
                                   struct ldb_message ***msgs_domain_ref)
 
393
{                          
 
394
        struct ldb_dn *user_dn, *domain_dn;
 
395
        NTSTATUS nt_status;
 
396
        TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 
397
        int ret;
 
398
        struct ldb_dn *partitions_basedn = samdb_partitions_dn(sam_ctx, mem_ctx);
 
399
 
 
400
        if (!tmp_ctx) {
 
401
                return NT_STATUS_NO_MEMORY;
 
402
        }
 
403
 
 
404
        nt_status = crack_user_principal_name(sam_ctx, tmp_ctx, principal, &user_dn, &domain_dn);
 
405
        if (!NT_STATUS_IS_OK(nt_status)) {
 
406
                talloc_free(tmp_ctx);
 
407
                return nt_status;
 
408
        }
 
409
        
 
410
        /* grab domain info from the reference */
 
411
        ret = gendb_search(sam_ctx, tmp_ctx, partitions_basedn, msgs_domain_ref, domain_ref_attrs,
 
412
                           "(ncName=%s)", ldb_dn_get_linearized(domain_dn));
 
413
 
 
414
        if (ret != 1) {
 
415
                talloc_free(tmp_ctx);
 
416
                return NT_STATUS_INTERNAL_DB_CORRUPTION;
 
417
        }
 
418
        
 
419
        /* pull the user attributes */
 
420
        ret = gendb_search_dn(sam_ctx, tmp_ctx, user_dn, msgs, user_attrs);
 
421
        if (ret != 1) {
 
422
                talloc_free(tmp_ctx);
 
423
                return NT_STATUS_INTERNAL_DB_CORRUPTION;
 
424
        }
 
425
        talloc_steal(mem_ctx, *msgs);
 
426
        talloc_steal(mem_ctx, *msgs_domain_ref);
 
427
        talloc_free(tmp_ctx);
 
428
        
 
429
        return NT_STATUS_OK;
 
430
}