source: branches/samba-3.3.x/source/auth/auth_domain.c@ 221

Last change on this file since 221 was 206, checked in by Herwig Bauernfeind, 17 years ago

Import Samba 3.3 branch at 3.0.0 level (psmedley's port)
File size: 16.1 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 Authenticate against a remote domain
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Andrew Bartlett 2001
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
19*/
20
21#include "includes.h"
22
23#undef DBGC_CLASS
24#define DBGC_CLASS DBGC_AUTH
25
26extern bool global_machine_password_needs_changing;
27static struct named_mutex *mutex;
28
29/*
30 * Change machine password (called from main loop
31 * idle timeout. Must be done as root.
32 */
33
34void attempt_machine_password_change(void)
35{
36 unsigned char trust_passwd_hash[16];
37 time_t lct;
38 void *lock;
39
40 if (!global_machine_password_needs_changing) {
41 return;
42 }
43
44 if (lp_security() != SEC_DOMAIN) {
45 return;
46 }
47
48 /*
49 * We're in domain level security, and the code that
50 * read the machine password flagged that the machine
51 * password needs changing.
52 */
53
54 /*
55 * First, open the machine password file with an exclusive lock.
56 */
57
58 lock = secrets_get_trust_account_lock(NULL, lp_workgroup());
59
60 if (lock == NULL) {
61 DEBUG(0,("attempt_machine_password_change: unable to lock "
62 "the machine account password for machine %s in "
63 "domain %s.\n",
64 global_myname(), lp_workgroup() ));
65 return;
66 }
67
68 if(!secrets_fetch_trust_account_password(lp_workgroup(),
69 trust_passwd_hash, &lct, NULL)) {
70 DEBUG(0,("attempt_machine_password_change: unable to read the "
71 "machine account password for %s in domain %s.\n",
72 global_myname(), lp_workgroup()));
73 TALLOC_FREE(lock);
74 return;
75 }
76
77 /*
78 * Make sure someone else hasn't already done this.
79 */
80
81 if(time(NULL) < lct + lp_machine_password_timeout()) {
82 global_machine_password_needs_changing = false;
83 TALLOC_FREE(lock);
84 return;
85 }
86
87 /* always just contact the PDC here */
88
89 change_trust_account_password( lp_workgroup(), NULL);
90 global_machine_password_needs_changing = false;
91 TALLOC_FREE(lock);
92}
93
94/**
95 * Connect to a remote server for (inter)domain security authenticaion.
96 *
97 * @param cli the cli to return containing the active connection
98 * @param server either a machine name or text IP address to
99 * connect to.
100 * @param setup_creds_as domain account to setup credentials as
101 * @param sec_chan a switch value to distinguish between domain
102 * member and interdomain authentication
103 * @param trust_passwd the trust password to establish the
104 * credentials with.
105 *
106 **/
107
108static NTSTATUS connect_to_domain_password_server(struct cli_state **cli,
109 const char *domain,
110 const char *dc_name,
111 struct sockaddr_storage *dc_ss,
112 struct rpc_pipe_client **pipe_ret,
113 bool *retry)
114{
115 NTSTATUS result;
116 struct rpc_pipe_client *netlogon_pipe = NULL;
117
118 *cli = NULL;
119
120 *pipe_ret = NULL;
121
122 /* TODO: Send a SAMLOGON request to determine whether this is a valid
123 logonserver. We can avoid a 30-second timeout if the DC is down
124 if the SAMLOGON request fails as it is only over UDP. */
125
126 /* we use a mutex to prevent two connections at once - when a
127 Win2k PDC get two connections where one hasn't completed a
128 session setup yet it will send a TCP reset to the first
129 connection (tridge) */
130
131 /*
132 * With NT4.x DC's *all* authentication must be serialized to avoid
133 * ACCESS_DENIED errors if 2 auths are done from the same machine. JRA.
134 */
135
136 mutex = grab_named_mutex(NULL, dc_name, 10);
137 if (mutex == NULL) {
138 return NT_STATUS_NO_LOGON_SERVERS;
139 }
140
141 /* Attempt connection */
142 *retry = True;
143 result = cli_full_connection(cli, global_myname(), dc_name, dc_ss, 0,
144 "IPC$", "IPC", "", "", "", 0, Undefined, retry);
145
146 if (!NT_STATUS_IS_OK(result)) {
147 /* map to something more useful */
148 if (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)) {
149 result = NT_STATUS_NO_LOGON_SERVERS;
150 }
151
152 if (*cli) {
153 cli_shutdown(*cli);
154 *cli = NULL;
155 }
156
157 TALLOC_FREE(mutex);
158 return result;
159 }
160
161 /*
162 * We now have an anonymous connection to IPC$ on the domain password server.
163 */
164
165 /*
166 * Even if the connect succeeds we need to setup the netlogon
167 * pipe here. We do this as we may just have changed the domain
168 * account password on the PDC and yet we may be talking to
169 * a BDC that doesn't have this replicated yet. In this case
170 * a successful connect to a DC needs to take the netlogon connect
171 * into account also. This patch from "Bjart Kvarme" <[email protected]>.
172 */
173
174 /* open the netlogon pipe. */
175 if (lp_client_schannel()) {
176 /* We also setup the creds chain in the open_schannel call. */
177 result = cli_rpc_pipe_open_schannel(
178 *cli, &ndr_table_netlogon.syntax_id,
179 PIPE_AUTH_LEVEL_PRIVACY, domain, &netlogon_pipe);
180 } else {
181 result = cli_rpc_pipe_open_noauth(
182 *cli, &ndr_table_netlogon.syntax_id, &netlogon_pipe);
183 }
184
185 if (!NT_STATUS_IS_OK(result)) {
186 DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
187machine %s. Error was : %s.\n", dc_name, nt_errstr(result)));
188 cli_shutdown(*cli);
189 *cli = NULL;
190 TALLOC_FREE(mutex);
191 return result;
192 }
193
194 if (!lp_client_schannel()) {
195 /* We need to set up a creds chain on an unauthenticated netlogon pipe. */
196 uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
197 uint32 sec_chan_type = 0;
198 unsigned char machine_pwd[16];
199 const char *account_name;
200
201 if (!get_trust_pw_hash(domain, machine_pwd, &account_name,
202 &sec_chan_type))
203 {
204 DEBUG(0, ("connect_to_domain_password_server: could not fetch "
205 "trust account password for domain '%s'\n",
206 domain));
207 cli_shutdown(*cli);
208 *cli = NULL;
209 TALLOC_FREE(mutex);
210 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
211 }
212
213 result = rpccli_netlogon_setup_creds(netlogon_pipe,
214 dc_name, /* server name */
215 domain, /* domain */
216 global_myname(), /* client name */
217 account_name, /* machine account name */
218 machine_pwd,
219 sec_chan_type,
220 &neg_flags);
221
222 if (!NT_STATUS_IS_OK(result)) {
223 cli_shutdown(*cli);
224 *cli = NULL;
225 TALLOC_FREE(mutex);
226 return result;
227 }
228 }
229
230 if(!netlogon_pipe) {
231 DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
232machine %s. Error was : %s.\n", dc_name, cli_errstr(*cli)));
233 cli_shutdown(*cli);
234 *cli = NULL;
235 TALLOC_FREE(mutex);
236 return NT_STATUS_NO_LOGON_SERVERS;
237 }
238
239 /* We exit here with the mutex *locked*. JRA */
240
241 *pipe_ret = netlogon_pipe;
242
243 return NT_STATUS_OK;
244}
245
246/***********************************************************************
247 Do the same as security=server, but using NT Domain calls and a session
248 key from the machine password. If the server parameter is specified
249 use it, otherwise figure out a server from the 'password server' param.
250************************************************************************/
251
252static NTSTATUS domain_client_validate(TALLOC_CTX *mem_ctx,
253 const auth_usersupplied_info *user_info,
254 const char *domain,
255 uchar chal[8],
256 auth_serversupplied_info **server_info,
257 const char *dc_name,
258 struct sockaddr_storage *dc_ss)
259
260{
261 struct netr_SamInfo3 *info3 = NULL;
262 struct cli_state *cli = NULL;
263 struct rpc_pipe_client *netlogon_pipe = NULL;
264 NTSTATUS nt_status = NT_STATUS_NO_LOGON_SERVERS;
265 int i;
266 bool retry = True;
267
268 /*
269 * At this point, smb_apasswd points to the lanman response to
270 * the challenge in local_challenge, and smb_ntpasswd points to
271 * the NT response to the challenge in local_challenge. Ship
272 * these over the secure channel to a domain controller and
273 * see if they were valid.
274 */
275
276 /* rety loop for robustness */
277
278 for (i = 0; !NT_STATUS_IS_OK(nt_status) && retry && (i < 3); i++) {
279 nt_status = connect_to_domain_password_server(&cli,
280 domain,
281 dc_name,
282 dc_ss,
283 &netlogon_pipe,
284 &retry);
285 }
286
287 if ( !NT_STATUS_IS_OK(nt_status) ) {
288 DEBUG(0,("domain_client_validate: Domain password server not available.\n"));
289 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
290 return NT_STATUS_TRUSTED_RELATIONSHIP_FAILURE;
291 }
292 return nt_status;
293 }
294
295 /* store a successful connection */
296
297 saf_store( domain, cli->desthost );
298
299 /*
300 * If this call succeeds, we now have lots of info about the user
301 * in the info3 structure.
302 */
303
304 nt_status = rpccli_netlogon_sam_network_logon(netlogon_pipe,
305 mem_ctx,
306 user_info->logon_parameters,/* flags such as 'allow workstation logon' */
307 dc_name, /* server name */
308 user_info->smb_name, /* user name logging on. */
309 user_info->client_domain, /* domain name */
310 user_info->wksta_name, /* workstation name */
311 chal, /* 8 byte challenge. */
312 user_info->lm_resp, /* lanman 24 byte response */
313 user_info->nt_resp, /* nt 24 byte response */
314 &info3); /* info3 out */
315
316 /* Let go as soon as possible so we avoid any potential deadlocks
317 with winbind lookup up users or groups. */
318
319 TALLOC_FREE(mutex);
320
321 if (!NT_STATUS_IS_OK(nt_status)) {
322 DEBUG(0,("domain_client_validate: unable to validate password "
323 "for user %s in domain %s to Domain controller %s. "
324 "Error was %s.\n", user_info->smb_name,
325 user_info->client_domain, dc_name,
326 nt_errstr(nt_status)));
327
328 /* map to something more useful */
329 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
330 nt_status = NT_STATUS_NO_LOGON_SERVERS;
331 }
332 } else {
333 nt_status = make_server_info_info3(mem_ctx,
334 user_info->smb_name,
335 domain,
336 server_info,
337 info3);
338
339 if (NT_STATUS_IS_OK(nt_status)) {
340 (*server_info)->nss_token |= user_info->was_mapped;
341
342 if ( ! (*server_info)->guest) {
343 /* if a real user check pam account restrictions */
344 /* only really perfomed if "obey pam restriction" is true */
345 nt_status = smb_pam_accountcheck((*server_info)->unix_name);
346 if ( !NT_STATUS_IS_OK(nt_status)) {
347 DEBUG(1, ("PAM account restriction prevents user login\n"));
348 cli_shutdown(cli);
349 TALLOC_FREE(info3);
350 return nt_status;
351 }
352 }
353 }
354
355 netsamlogon_cache_store(user_info->smb_name, info3);
356 TALLOC_FREE(info3);
357 }
358
359 /* Note - once the cli stream is shutdown the mem_ctx used
360 to allocate the other_sids and gids structures has been deleted - so
361 these pointers are no longer valid..... */
362
363 cli_shutdown(cli);
364 return nt_status;
365}
366
367/****************************************************************************
368 Check for a valid username and password in security=domain mode.
369****************************************************************************/
370
371static NTSTATUS check_ntdomain_security(const struct auth_context *auth_context,
372 void *my_private_data,
373 TALLOC_CTX *mem_ctx,
374 const auth_usersupplied_info *user_info,
375 auth_serversupplied_info **server_info)
376{
377 NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
378 const char *domain = lp_workgroup();
379 fstring dc_name;
380 struct sockaddr_storage dc_ss;
381
382 if ( lp_server_role() != ROLE_DOMAIN_MEMBER ) {
383 DEBUG(0,("check_ntdomain_security: Configuration error! Cannot use "
384 "ntdomain auth method when not a member of a domain.\n"));
385 return NT_STATUS_NOT_IMPLEMENTED;
386 }
387
388 if (!user_info || !server_info || !auth_context) {
389 DEBUG(1,("check_ntdomain_security: Critical variables not present. Failing.\n"));
390 return NT_STATUS_INVALID_PARAMETER;
391 }
392
393 /*
394 * Check that the requested domain is not our own machine name.
395 * If it is, we should never check the PDC here, we use our own local
396 * password file.
397 */
398
399 if(strequal(get_global_sam_name(), user_info->domain)) {
400 DEBUG(3,("check_ntdomain_security: Requested domain was for this machine.\n"));
401 return NT_STATUS_NOT_IMPLEMENTED;
402 }
403
404 /* we need our DC to send the net_sam_logon() request to */
405
406 if ( !get_dc_name(domain, NULL, dc_name, &dc_ss) ) {
407 DEBUG(5,("check_ntdomain_security: unable to locate a DC for domain %s\n",
408 user_info->domain));
409 return NT_STATUS_NO_LOGON_SERVERS;
410 }
411
412 nt_status = domain_client_validate(mem_ctx,
413 user_info,
414 domain,
415 (uchar *)auth_context->challenge.data,
416 server_info,
417 dc_name,
418 &dc_ss);
419
420 return nt_status;
421}
422
423/* module initialisation */
424static NTSTATUS auth_init_ntdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
425{
426 if (!make_auth_methods(auth_context, auth_method)) {
427 return NT_STATUS_NO_MEMORY;
428 }
429
430 (*auth_method)->name = "ntdomain";
431 (*auth_method)->auth = check_ntdomain_security;
432 return NT_STATUS_OK;
433}
434
435
436/****************************************************************************
437 Check for a valid username and password in a trusted domain
438****************************************************************************/
439
440static NTSTATUS check_trustdomain_security(const struct auth_context *auth_context,
441 void *my_private_data,
442 TALLOC_CTX *mem_ctx,
443 const auth_usersupplied_info *user_info,
444 auth_serversupplied_info **server_info)
445{
446 NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
447 unsigned char trust_md4_password[16];
448 char *trust_password;
449 time_t last_change_time;
450 DOM_SID sid;
451 fstring dc_name;
452 struct sockaddr_storage dc_ss;
453
454 if (!user_info || !server_info || !auth_context) {
455 DEBUG(1,("check_trustdomain_security: Critical variables not present. Failing.\n"));
456 return NT_STATUS_INVALID_PARAMETER;
457 }
458
459 /*
460 * Check that the requested domain is not our own machine name or domain name.
461 */
462
463 if( strequal(get_global_sam_name(), user_info->domain)) {
464 DEBUG(3,("check_trustdomain_security: Requested domain [%s] was for this machine.\n",
465 user_info->domain));
466 return NT_STATUS_NOT_IMPLEMENTED;
467 }
468
469 /* No point is bothering if this is not a trusted domain.
470 This return makes "map to guest = bad user" work again.
471 The logic is that if we know nothing about the domain, that
472 user is not known to us and does not exist */
473
474 if ( !is_trusted_domain( user_info->domain ) )
475 return NT_STATUS_NOT_IMPLEMENTED;
476
477 /*
478 * Get the trusted account password for the trusted domain
479 * No need to become_root() as secrets_init() is done at startup.
480 */
481
482 if (!pdb_get_trusteddom_pw(user_info->domain, &trust_password,
483 &sid, &last_change_time)) {
484 DEBUG(0, ("check_trustdomain_security: could not fetch trust "
485 "account password for domain %s\n",
486 user_info->domain));
487 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
488 }
489
490#ifdef DEBUG_PASSWORD
491 DEBUG(100, ("Trust password for domain %s is %s\n", user_info->domain,
492 trust_password));
493#endif
494 E_md4hash(trust_password, trust_md4_password);
495 SAFE_FREE(trust_password);
496
497#if 0
498 /* Test if machine password is expired and need to be changed */
499 if (time(NULL) > last_change_time + (time_t)lp_machine_password_timeout())
500 {
501 global_machine_password_needs_changing = True;
502 }
503#endif
504
505 /* use get_dc_name() for consistency even through we know that it will be
506 a netbios name */
507
508 if ( !get_dc_name(user_info->domain, NULL, dc_name, &dc_ss) ) {
509 DEBUG(5,("check_trustdomain_security: unable to locate a DC for domain %s\n",
510 user_info->domain));
511 return NT_STATUS_NO_LOGON_SERVERS;
512 }
513
514 nt_status = domain_client_validate(mem_ctx,
515 user_info,
516 user_info->domain,
517 (uchar *)auth_context->challenge.data,
518 server_info,
519 dc_name,
520 &dc_ss);
521
522 return nt_status;
523}
524
525/* module initialisation */
526static NTSTATUS auth_init_trustdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
527{
528 if (!make_auth_methods(auth_context, auth_method)) {
529 return NT_STATUS_NO_MEMORY;
530 }
531
532 (*auth_method)->name = "trustdomain";
533 (*auth_method)->auth = check_trustdomain_security;
534 return NT_STATUS_OK;
535}
536
537NTSTATUS auth_domain_init(void)
538{
539 smb_register_auth(AUTH_INTERFACE_VERSION, "trustdomain", auth_init_trustdomain);
540 smb_register_auth(AUTH_INTERFACE_VERSION, "ntdomain", auth_init_ntdomain);
541 return NT_STATUS_OK;
542}
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