source: trunk-3.0/source/auth/auth_domain.c@ 101

Last change on this file since 101 was 22, checked in by Yuri Dario, 18 years ago

Source code upgrade to 3.0.25pre2.
File size: 15.0 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 2 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, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20*/
21
22#include "includes.h"
23
24#undef DBGC_CLASS
25#define DBGC_CLASS DBGC_AUTH
26
27extern BOOL global_machine_password_needs_changing;
28
29/**
30 * Connect to a remote server for (inter)domain security authenticaion.
31 *
32 * @param cli the cli to return containing the active connection
33 * @param server either a machine name or text IP address to
34 * connect to.
35 * @param setup_creds_as domain account to setup credentials as
36 * @param sec_chan a switch value to distinguish between domain
37 * member and interdomain authentication
38 * @param trust_passwd the trust password to establish the
39 * credentials with.
40 *
41 **/
42
43static NTSTATUS connect_to_domain_password_server(struct cli_state **cli,
44 const char *domain,
45 const char *dc_name,
46 struct in_addr dc_ip,
47 struct rpc_pipe_client **pipe_ret,
48 BOOL *retry)
49{
50 NTSTATUS result;
51 struct rpc_pipe_client *netlogon_pipe = NULL;
52
53 *cli = NULL;
54
55 *pipe_ret = NULL;
56
57 /* TODO: Send a SAMLOGON request to determine whether this is a valid
58 logonserver. We can avoid a 30-second timeout if the DC is down
59 if the SAMLOGON request fails as it is only over UDP. */
60
61 /* we use a mutex to prevent two connections at once - when a
62 Win2k PDC get two connections where one hasn't completed a
63 session setup yet it will send a TCP reset to the first
64 connection (tridge) */
65
66 /*
67 * With NT4.x DC's *all* authentication must be serialized to avoid
68 * ACCESS_DENIED errors if 2 auths are done from the same machine. JRA.
69 */
70
71 if (!grab_server_mutex(dc_name)) {
72 return NT_STATUS_NO_LOGON_SERVERS;
73 }
74
75 /* Attempt connection */
76 *retry = True;
77 result = cli_full_connection(cli, global_myname(), dc_name, &dc_ip, 0,
78 "IPC$", "IPC", "", "", "", 0, Undefined, retry);
79
80 if (!NT_STATUS_IS_OK(result)) {
81 /* map to something more useful */
82 if (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)) {
83 result = NT_STATUS_NO_LOGON_SERVERS;
84 }
85
86 if (*cli) {
87 cli_shutdown(*cli);
88 *cli = NULL;
89 }
90
91 release_server_mutex();
92 return result;
93 }
94
95 /*
96 * We now have an anonymous connection to IPC$ on the domain password server.
97 */
98
99 /*
100 * Even if the connect succeeds we need to setup the netlogon
101 * pipe here. We do this as we may just have changed the domain
102 * account password on the PDC and yet we may be talking to
103 * a BDC that doesn't have this replicated yet. In this case
104 * a successful connect to a DC needs to take the netlogon connect
105 * into account also. This patch from "Bjart Kvarme" <bjart.kvarme@usit.uio.no>.
106 */
107
108 /* open the netlogon pipe. */
109 if (lp_client_schannel()) {
110 /* We also setup the creds chain in the open_schannel call. */
111 netlogon_pipe = cli_rpc_pipe_open_schannel(*cli, PI_NETLOGON,
112 PIPE_AUTH_LEVEL_PRIVACY, domain, &result);
113 } else {
114 netlogon_pipe = cli_rpc_pipe_open_noauth(*cli, PI_NETLOGON, &result);
115 }
116
117 if(!netlogon_pipe) {
118 DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
119machine %s. Error was : %s.\n", dc_name, nt_errstr(result)));
120 cli_shutdown(*cli);
121 *cli = NULL;
122 release_server_mutex();
123 return result;
124 }
125
126 if (!lp_client_schannel()) {
127 /* We need to set up a creds chain on an unauthenticated netlogon pipe. */
128 uint32 neg_flags = NETLOGON_NEG_AUTH2_FLAGS;
129 uint32 sec_chan_type = 0;
130 unsigned char machine_pwd[16];
131
132 if (!get_trust_pw(domain, machine_pwd, &sec_chan_type)) {
133 DEBUG(0, ("connect_to_domain_password_server: could not fetch "
134 "trust account password for domain '%s'\n",
135 domain));
136 cli_shutdown(*cli);
137 *cli = NULL;
138 release_server_mutex();
139 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
140 }
141
142 result = rpccli_netlogon_setup_creds(netlogon_pipe,
143 dc_name, /* server name */
144 domain, /* domain */
145 global_myname(), /* client name */
146 global_myname(), /* machine account name */
147 machine_pwd,
148 sec_chan_type,
149 &neg_flags);
150
151 if (!NT_STATUS_IS_OK(result)) {
152 cli_shutdown(*cli);
153 *cli = NULL;
154 release_server_mutex();
155 return result;
156 }
157 }
158
159 if(!netlogon_pipe) {
160 DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
161machine %s. Error was : %s.\n", dc_name, cli_errstr(*cli)));
162 cli_shutdown(*cli);
163 *cli = NULL;
164 release_server_mutex();
165 return NT_STATUS_NO_LOGON_SERVERS;
166 }
167
168 /* We exit here with the mutex *locked*. JRA */
169
170 *pipe_ret = netlogon_pipe;
171
172 return NT_STATUS_OK;
173}
174
175/***********************************************************************
176 Do the same as security=server, but using NT Domain calls and a session
177 key from the machine password. If the server parameter is specified
178 use it, otherwise figure out a server from the 'password server' param.
179************************************************************************/
180
181static NTSTATUS domain_client_validate(TALLOC_CTX *mem_ctx,
182 const auth_usersupplied_info *user_info,
183 const char *domain,
184 uchar chal[8],
185 auth_serversupplied_info **server_info,
186 const char *dc_name,
187 struct in_addr dc_ip)
188
189{
190 NET_USER_INFO_3 info3;
191 struct cli_state *cli = NULL;
192 struct rpc_pipe_client *netlogon_pipe = NULL;
193 NTSTATUS nt_status = NT_STATUS_NO_LOGON_SERVERS;
194 int i;
195 BOOL retry = True;
196
197 /*
198 * At this point, smb_apasswd points to the lanman response to
199 * the challenge in local_challenge, and smb_ntpasswd points to
200 * the NT response to the challenge in local_challenge. Ship
201 * these over the secure channel to a domain controller and
202 * see if they were valid.
203 */
204
205 /* rety loop for robustness */
206
207 for (i = 0; !NT_STATUS_IS_OK(nt_status) && retry && (i < 3); i++) {
208 nt_status = connect_to_domain_password_server(&cli,
209 domain,
210 dc_name,
211 dc_ip,
212 &netlogon_pipe,
213 &retry);
214 }
215
216 if ( !NT_STATUS_IS_OK(nt_status) ) {
217 DEBUG(0,("domain_client_validate: Domain password server not available.\n"));
218 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
219 return NT_STATUS_TRUSTED_RELATIONSHIP_FAILURE;
220 }
221 return nt_status;
222 }
223
224 /* store a successful connection */
225
226 saf_store( domain, cli->desthost );
227
228 ZERO_STRUCT(info3);
229
230 /*
231 * If this call succeeds, we now have lots of info about the user
232 * in the info3 structure.
233 */
234
235 nt_status = rpccli_netlogon_sam_network_logon(netlogon_pipe,
236 mem_ctx,
237 user_info->logon_parameters,/* flags such as 'allow workstation logon' */
238 dc_name, /* server name */
239 user_info->smb_name, /* user name logging on. */
240 user_info->client_domain, /* domain name */
241 user_info->wksta_name, /* workstation name */
242 chal, /* 8 byte challenge. */
243 user_info->lm_resp, /* lanman 24 byte response */
244 user_info->nt_resp, /* nt 24 byte response */
245 &info3); /* info3 out */
246
247 /* Let go as soon as possible so we avoid any potential deadlocks
248 with winbind lookup up users or groups. */
249
250 release_server_mutex();
251
252 if (!NT_STATUS_IS_OK(nt_status)) {
253 DEBUG(0,("domain_client_validate: unable to validate password "
254 "for user %s in domain %s to Domain controller %s. "
255 "Error was %s.\n", user_info->smb_name,
256 user_info->domain, dc_name,
257 nt_errstr(nt_status)));
258
259 /* map to something more useful */
260 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
261 nt_status = NT_STATUS_NO_LOGON_SERVERS;
262 }
263 } else {
264 nt_status = make_server_info_info3(mem_ctx,
265 user_info->smb_name,
266 domain,
267 server_info,
268 &info3);
269
270 if (NT_STATUS_IS_OK(nt_status)) {
271 (*server_info)->was_mapped |= user_info->was_mapped;
272
273 if ( ! (*server_info)->guest) {
274 /* if a real user check pam account restrictions */
275 /* only really perfomed if "obey pam restriction" is true */
276 nt_status = smb_pam_accountcheck((*server_info)->unix_name);
277 if ( !NT_STATUS_IS_OK(nt_status)) {
278 DEBUG(1, ("PAM account restriction prevents user login\n"));
279 cli_shutdown(cli);
280 return nt_status;
281 }
282 }
283 }
284
285 netsamlogon_cache_store( user_info->smb_name, &info3 );
286 }
287
288 /* Note - once the cli stream is shutdown the mem_ctx used
289 to allocate the other_sids and gids structures has been deleted - so
290 these pointers are no longer valid..... */
291
292 cli_shutdown(cli);
293 return nt_status;
294}
295
296/****************************************************************************
297 Check for a valid username and password in security=domain mode.
298****************************************************************************/
299
300static NTSTATUS check_ntdomain_security(const struct auth_context *auth_context,
301 void *my_private_data,
302 TALLOC_CTX *mem_ctx,
303 const auth_usersupplied_info *user_info,
304 auth_serversupplied_info **server_info)
305{
306 NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
307 const char *domain = lp_workgroup();
308 fstring dc_name;
309 struct in_addr dc_ip;
310
311 if ( lp_server_role() != ROLE_DOMAIN_MEMBER ) {
312 DEBUG(0,("check_ntdomain_security: Configuration error! Cannot use "
313 "ntdomain auth method when not a member of a domain.\n"));
314 return NT_STATUS_NOT_IMPLEMENTED;
315 }
316
317 if (!user_info || !server_info || !auth_context) {
318 DEBUG(1,("check_ntdomain_security: Critical variables not present. Failing.\n"));
319 return NT_STATUS_INVALID_PARAMETER;
320 }
321
322 /*
323 * Check that the requested domain is not our own machine name.
324 * If it is, we should never check the PDC here, we use our own local
325 * password file.
326 */
327
328 if(strequal(get_global_sam_name(), user_info->domain)) {
329 DEBUG(3,("check_ntdomain_security: Requested domain was for this machine.\n"));
330 return NT_STATUS_NOT_IMPLEMENTED;
331 }
332
333 /* we need our DC to send the net_sam_logon() request to */
334
335 if ( !get_dc_name(domain, NULL, dc_name, &dc_ip) ) {
336 DEBUG(5,("check_ntdomain_security: unable to locate a DC for domain %s\n",
337 user_info->domain));
338 return NT_STATUS_NO_LOGON_SERVERS;
339 }
340
341 nt_status = domain_client_validate(mem_ctx,
342 user_info,
343 domain,
344 (uchar *)auth_context->challenge.data,
345 server_info,
346 dc_name,
347 dc_ip);
348
349 return nt_status;
350}
351
352/* module initialisation */
353static NTSTATUS auth_init_ntdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
354{
355 if (!make_auth_methods(auth_context, auth_method)) {
356 return NT_STATUS_NO_MEMORY;
357 }
358
359 (*auth_method)->name = "ntdomain";
360 (*auth_method)->auth = check_ntdomain_security;
361 return NT_STATUS_OK;
362}
363
364
365/****************************************************************************
366 Check for a valid username and password in a trusted domain
367****************************************************************************/
368
369static NTSTATUS check_trustdomain_security(const struct auth_context *auth_context,
370 void *my_private_data,
371 TALLOC_CTX *mem_ctx,
372 const auth_usersupplied_info *user_info,
373 auth_serversupplied_info **server_info)
374{
375 NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
376 unsigned char trust_md4_password[16];
377 char *trust_password;
378 time_t last_change_time;
379 DOM_SID sid;
380 fstring dc_name;
381 struct in_addr dc_ip;
382
383 if (!user_info || !server_info || !auth_context) {
384 DEBUG(1,("check_trustdomain_security: Critical variables not present. Failing.\n"));
385 return NT_STATUS_INVALID_PARAMETER;
386 }
387
388 /*
389 * Check that the requested domain is not our own machine name or domain name.
390 */
391
392 if( strequal(get_global_sam_name(), user_info->domain)) {
393 DEBUG(3,("check_trustdomain_security: Requested domain [%s] was for this machine.\n",
394 user_info->domain));
395 return NT_STATUS_NOT_IMPLEMENTED;
396 }
397
398 /* No point is bothering if this is not a trusted domain.
399 This return makes "map to guest = bad user" work again.
400 The logic is that if we know nothing about the domain, that
401 user is not known to us and does not exist */
402
403 if ( !is_trusted_domain( user_info->domain ) )
404 return NT_STATUS_NOT_IMPLEMENTED;
405
406 /*
407 * Get the trusted account password for the trusted domain
408 * No need to become_root() as secrets_init() is done at startup.
409 */
410
411 if (!secrets_fetch_trusted_domain_password(user_info->domain, &trust_password,
412 &sid, &last_change_time)) {
413 DEBUG(0, ("check_trustdomain_security: could not fetch trust "
414 "account password for domain %s\n",
415 user_info->domain));
416 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
417 }
418
419#ifdef DEBUG_PASSWORD
420 DEBUG(100, ("Trust password for domain %s is %s\n", user_info->domain,
421 trust_password));
422#endif
423 E_md4hash(trust_password, trust_md4_password);
424 SAFE_FREE(trust_password);
425
426#if 0
427 /* Test if machine password is expired and need to be changed */
428 if (time(NULL) > last_change_time + (time_t)lp_machine_password_timeout())
429 {
430 global_machine_password_needs_changing = True;
431 }
432#endif
433
434 /* use get_dc_name() for consistency even through we know that it will be
435 a netbios name */
436
437 if ( !get_dc_name(user_info->domain, NULL, dc_name, &dc_ip) ) {
438 DEBUG(5,("check_trustdomain_security: unable to locate a DC for domain %s\n",
439 user_info->domain));
440 return NT_STATUS_NO_LOGON_SERVERS;
441 }
442
443 nt_status = domain_client_validate(mem_ctx,
444 user_info,
445 user_info->domain,
446 (uchar *)auth_context->challenge.data,
447 server_info,
448 dc_name,
449 dc_ip);
450
451 return nt_status;
452}
453
454/* module initialisation */
455static NTSTATUS auth_init_trustdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
456{
457 if (!make_auth_methods(auth_context, auth_method)) {
458 return NT_STATUS_NO_MEMORY;
459 }
460
461 (*auth_method)->name = "trustdomain";
462 (*auth_method)->auth = check_trustdomain_security;
463 return NT_STATUS_OK;
464}
465
466NTSTATUS auth_domain_init(void)
467{
468 smb_register_auth(AUTH_INTERFACE_VERSION, "trustdomain", auth_init_trustdomain);
469 smb_register_auth(AUTH_INTERFACE_VERSION, "ntdomain", auth_init_ntdomain);
470 return NT_STATUS_OK;
471}
Note: See TracBrowser for help on using the repository browser.