s3-secrets: only include secrets.h when needed.
[samba.git] / source3 / auth / auth_domain.c
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 #include "../libcli/auth/libcli_auth.h"
23 #include "../librpc/gen_ndr/ndr_netlogon.h"
24 #include "rpc_client/cli_netlogon.h"
25 #include "secrets.h"
26
27 #undef DBGC_CLASS
28 #define DBGC_CLASS DBGC_AUTH
29
30 extern bool global_machine_password_needs_changing;
31 static struct named_mutex *mutex;
32
33 /*
34  * Change machine password (called from main loop
35  * idle timeout. Must be done as root.
36  */
37
38 void attempt_machine_password_change(void)
39 {
40         unsigned char trust_passwd_hash[16];
41         time_t lct;
42         void *lock;
43
44         if (!global_machine_password_needs_changing) {
45                 return;
46         }
47
48         if (lp_security() != SEC_DOMAIN) {
49                 return;
50         }
51
52         /*
53          * We're in domain level security, and the code that
54          * read the machine password flagged that the machine
55          * password needs changing.
56          */
57
58         /*
59          * First, open the machine password file with an exclusive lock.
60          */
61
62         lock = secrets_get_trust_account_lock(NULL, lp_workgroup());
63
64         if (lock == NULL) {
65                 DEBUG(0,("attempt_machine_password_change: unable to lock "
66                         "the machine account password for machine %s in "
67                         "domain %s.\n",
68                         global_myname(), lp_workgroup() ));
69                 return;
70         }
71
72         if(!secrets_fetch_trust_account_password(lp_workgroup(),
73                         trust_passwd_hash, &lct, NULL)) {
74                 DEBUG(0,("attempt_machine_password_change: unable to read the "
75                         "machine account password for %s in domain %s.\n",
76                         global_myname(), lp_workgroup()));
77                 TALLOC_FREE(lock);
78                 return;
79         }
80
81         /*
82          * Make sure someone else hasn't already done this.
83          */
84
85         if(time(NULL) < lct + lp_machine_password_timeout()) {
86                 global_machine_password_needs_changing = false;
87                 TALLOC_FREE(lock);
88                 return;
89         }
90
91         /* always just contact the PDC here */
92
93         change_trust_account_password( lp_workgroup(), NULL);
94         global_machine_password_needs_changing = false;
95         TALLOC_FREE(lock);
96 }
97
98 /**
99  * Connect to a remote server for (inter)domain security authenticaion.
100  *
101  * @param cli the cli to return containing the active connection
102  * @param server either a machine name or text IP address to
103  *               connect to.
104  * @param setup_creds_as domain account to setup credentials as
105  * @param sec_chan a switch value to distinguish between domain
106  *                 member and interdomain authentication
107  * @param trust_passwd the trust password to establish the
108  *                     credentials with.
109  *
110  **/
111
112 static NTSTATUS connect_to_domain_password_server(struct cli_state **cli,
113                                                 const char *domain,
114                                                 const char *dc_name,
115                                                 struct sockaddr_storage *dc_ss, 
116                                                 struct rpc_pipe_client **pipe_ret,
117                                                 bool *retry)
118 {
119         NTSTATUS result;
120         struct rpc_pipe_client *netlogon_pipe = NULL;
121
122         *cli = NULL;
123
124         *pipe_ret = NULL;
125
126         /* TODO: Send a SAMLOGON request to determine whether this is a valid
127            logonserver.  We can avoid a 30-second timeout if the DC is down
128            if the SAMLOGON request fails as it is only over UDP. */
129
130         /* we use a mutex to prevent two connections at once - when a 
131            Win2k PDC get two connections where one hasn't completed a 
132            session setup yet it will send a TCP reset to the first 
133            connection (tridge) */
134
135         /*
136          * With NT4.x DC's *all* authentication must be serialized to avoid
137          * ACCESS_DENIED errors if 2 auths are done from the same machine. JRA.
138          */
139
140         mutex = grab_named_mutex(NULL, dc_name, 10);
141         if (mutex == NULL) {
142                 return NT_STATUS_NO_LOGON_SERVERS;
143         }
144
145         /* Attempt connection */
146         *retry = True;
147         result = cli_full_connection(cli, global_myname(), dc_name, dc_ss, 0, 
148                 "IPC$", "IPC", "", "", "", 0, Undefined, retry);
149
150         if (!NT_STATUS_IS_OK(result)) {
151                 /* map to something more useful */
152                 if (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)) {
153                         result = NT_STATUS_NO_LOGON_SERVERS;
154                 }
155
156                 if (*cli) {
157                         cli_shutdown(*cli);
158                         *cli = NULL;
159                 }
160
161                 TALLOC_FREE(mutex);
162                 return result;
163         }
164
165         /*
166          * We now have an anonymous connection to IPC$ on the domain password server.
167          */
168
169         /*
170          * Even if the connect succeeds we need to setup the netlogon
171          * pipe here. We do this as we may just have changed the domain
172          * account password on the PDC and yet we may be talking to
173          * a BDC that doesn't have this replicated yet. In this case
174          * a successful connect to a DC needs to take the netlogon connect
175          * into account also. This patch from "Bjart Kvarme" <bjart.kvarme@usit.uio.no>.
176          */
177
178         /* open the netlogon pipe. */
179         if (lp_client_schannel()) {
180                 /* We also setup the creds chain in the open_schannel call. */
181                 result = cli_rpc_pipe_open_schannel(
182                         *cli, &ndr_table_netlogon.syntax_id, NCACN_NP,
183                         DCERPC_AUTH_LEVEL_PRIVACY, domain, &netlogon_pipe);
184         } else {
185                 result = cli_rpc_pipe_open_noauth(
186                         *cli, &ndr_table_netlogon.syntax_id, &netlogon_pipe);
187         }
188
189         if (!NT_STATUS_IS_OK(result)) {
190                 DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
191 machine %s. Error was : %s.\n", dc_name, nt_errstr(result)));
192                 cli_shutdown(*cli);
193                 *cli = NULL;
194                 TALLOC_FREE(mutex);
195                 return result;
196         }
197
198         if (!lp_client_schannel()) {
199                 /* We need to set up a creds chain on an unauthenticated netlogon pipe. */
200                 uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
201                 enum netr_SchannelType sec_chan_type = 0;
202                 unsigned char machine_pwd[16];
203                 const char *account_name;
204
205                 if (!get_trust_pw_hash(domain, machine_pwd, &account_name,
206                                        &sec_chan_type))
207                 {
208                         DEBUG(0, ("connect_to_domain_password_server: could not fetch "
209                         "trust account password for domain '%s'\n",
210                                 domain));
211                         cli_shutdown(*cli);
212                         *cli = NULL;
213                         TALLOC_FREE(mutex);
214                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
215                 }
216
217                 result = rpccli_netlogon_setup_creds(netlogon_pipe,
218                                         dc_name, /* server name */
219                                         domain, /* domain */
220                                         global_myname(), /* client name */
221                                         account_name, /* machine account name */
222                                         machine_pwd,
223                                         sec_chan_type,
224                                         &neg_flags);
225
226                 if (!NT_STATUS_IS_OK(result)) {
227                         cli_shutdown(*cli);
228                         *cli = NULL;
229                         TALLOC_FREE(mutex);
230                         return result;
231                 }
232         }
233
234         if(!netlogon_pipe) {
235                 DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
236 machine %s. Error was : %s.\n", dc_name, cli_errstr(*cli)));
237                 cli_shutdown(*cli);
238                 *cli = NULL;
239                 TALLOC_FREE(mutex);
240                 return NT_STATUS_NO_LOGON_SERVERS;
241         }
242
243         /* We exit here with the mutex *locked*. JRA */
244
245         *pipe_ret = netlogon_pipe;
246
247         return NT_STATUS_OK;
248 }
249
250 /***********************************************************************
251  Do the same as security=server, but using NT Domain calls and a session
252  key from the machine password.  If the server parameter is specified
253  use it, otherwise figure out a server from the 'password server' param.
254 ************************************************************************/
255
256 static NTSTATUS domain_client_validate(TALLOC_CTX *mem_ctx,
257                                         const struct auth_usersupplied_info *user_info,
258                                         const char *domain,
259                                         uchar chal[8],
260                                         struct auth_serversupplied_info **server_info,
261                                         const char *dc_name,
262                                         struct sockaddr_storage *dc_ss)
263
264 {
265         struct netr_SamInfo3 *info3 = NULL;
266         struct cli_state *cli = NULL;
267         struct rpc_pipe_client *netlogon_pipe = NULL;
268         NTSTATUS nt_status = NT_STATUS_NO_LOGON_SERVERS;
269         int i;
270         bool retry = True;
271
272         /*
273          * At this point, smb_apasswd points to the lanman response to
274          * the challenge in local_challenge, and smb_ntpasswd points to
275          * the NT response to the challenge in local_challenge. Ship
276          * these over the secure channel to a domain controller and
277          * see if they were valid.
278          */
279
280         /* rety loop for robustness */
281
282         for (i = 0; !NT_STATUS_IS_OK(nt_status) && retry && (i < 3); i++) {
283                 nt_status = connect_to_domain_password_server(&cli,
284                                                         domain,
285                                                         dc_name,
286                                                         dc_ss,
287                                                         &netlogon_pipe,
288                                                         &retry);
289         }
290
291         if ( !NT_STATUS_IS_OK(nt_status) ) {
292                 DEBUG(0,("domain_client_validate: Domain password server not available.\n"));
293                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
294                         return NT_STATUS_TRUSTED_RELATIONSHIP_FAILURE;
295                 }
296                 return nt_status;
297         }
298
299         /* store a successful connection */
300
301         saf_store( domain, cli->desthost );
302
303         /*
304          * If this call succeeds, we now have lots of info about the user
305          * in the info3 structure.  
306          */
307
308         nt_status = rpccli_netlogon_sam_network_logon(netlogon_pipe,
309                                                       mem_ctx,
310                                                       user_info->logon_parameters,/* flags such as 'allow workstation logon' */ 
311                                                       dc_name,                    /* server name */
312                                                       user_info->client.account_name,        /* user name logging on. */
313                                                       user_info->client.domain_name,   /* domain name */
314                                                       user_info->workstation_name,/* workstation name */
315                                                       chal,                       /* 8 byte challenge. */
316                                                       user_info->lm_resp,         /* lanman 24 byte response */
317                                                       user_info->nt_resp,         /* nt 24 byte response */
318                                                       &info3);                    /* info3 out */
319
320         /* Let go as soon as possible so we avoid any potential deadlocks
321            with winbind lookup up users or groups. */
322
323         TALLOC_FREE(mutex);
324
325         if (!NT_STATUS_IS_OK(nt_status)) {
326                 DEBUG(0,("domain_client_validate: unable to validate password "
327                          "for user %s in domain %s to Domain controller %s. "
328                          "Error was %s.\n", user_info->client.account_name,
329                          user_info->client.domain_name, dc_name,
330                          nt_errstr(nt_status)));
331
332                 /* map to something more useful */
333                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
334                         nt_status = NT_STATUS_NO_LOGON_SERVERS;
335                 }
336         } else {
337                 nt_status = make_server_info_info3(mem_ctx,
338                                                 user_info->client.account_name,
339                                                 domain,
340                                                 server_info,
341                                                 info3);
342
343                 if (NT_STATUS_IS_OK(nt_status)) {
344                         (*server_info)->nss_token |= user_info->was_mapped;
345
346                         if ( ! (*server_info)->guest) {
347                                 /* if a real user check pam account restrictions */
348                                 /* only really perfomed if "obey pam restriction" is true */
349                                 nt_status = smb_pam_accountcheck((*server_info)->unix_name);
350                                 if (  !NT_STATUS_IS_OK(nt_status)) {
351                                         DEBUG(1, ("PAM account restriction prevents user login\n"));
352                                         cli_shutdown(cli);
353                                         TALLOC_FREE(info3);
354                                         return nt_status;
355                                 }
356                         }
357                 }
358
359                 netsamlogon_cache_store(user_info->client.account_name, info3);
360                 TALLOC_FREE(info3);
361         }
362
363         /* Note - once the cli stream is shutdown the mem_ctx used
364            to allocate the other_sids and gids structures has been deleted - so
365            these pointers are no longer valid..... */
366
367         cli_shutdown(cli);
368         return nt_status;
369 }
370
371 /****************************************************************************
372  Check for a valid username and password in security=domain mode.
373 ****************************************************************************/
374
375 static NTSTATUS check_ntdomain_security(const struct auth_context *auth_context,
376                                         void *my_private_data, 
377                                         TALLOC_CTX *mem_ctx,
378                                         const struct auth_usersupplied_info *user_info,
379                                         struct auth_serversupplied_info **server_info)
380 {
381         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
382         const char *domain = lp_workgroup();
383         fstring dc_name;
384         struct sockaddr_storage dc_ss;
385
386         if ( lp_server_role() != ROLE_DOMAIN_MEMBER ) {
387                 DEBUG(0,("check_ntdomain_security: Configuration error!  Cannot use "
388                         "ntdomain auth method when not a member of a domain.\n"));
389                 return NT_STATUS_NOT_IMPLEMENTED;
390         }
391
392         if (!user_info || !server_info || !auth_context) {
393                 DEBUG(1,("check_ntdomain_security: Critical variables not present.  Failing.\n"));
394                 return NT_STATUS_INVALID_PARAMETER;
395         }
396
397         DEBUG(10, ("Check auth for: [%s]\n", user_info->mapped.account_name));
398
399         /* 
400          * Check that the requested domain is not our own machine name.
401          * If it is, we should never check the PDC here, we use our own local
402          * password file.
403          */
404
405         if(strequal(get_global_sam_name(), user_info->mapped.domain_name)) {
406                 DEBUG(3,("check_ntdomain_security: Requested domain was for this machine.\n"));
407                 return NT_STATUS_NOT_IMPLEMENTED;
408         }
409
410         /* we need our DC to send the net_sam_logon() request to */
411
412         if ( !get_dc_name(domain, NULL, dc_name, &dc_ss) ) {
413                 DEBUG(5,("check_ntdomain_security: unable to locate a DC for domain %s\n",
414                         user_info->mapped.domain_name));
415                 return NT_STATUS_NO_LOGON_SERVERS;
416         }
417
418         nt_status = domain_client_validate(mem_ctx,
419                                         user_info,
420                                         domain,
421                                         (uchar *)auth_context->challenge.data,
422                                         server_info,
423                                         dc_name,
424                                         &dc_ss);
425
426         return nt_status;
427 }
428
429 /* module initialisation */
430 static NTSTATUS auth_init_ntdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method) 
431 {
432         struct auth_methods *result;
433
434         result = TALLOC_ZERO_P(auth_context, struct auth_methods);
435         if (result == NULL) {
436                 return NT_STATUS_NO_MEMORY;
437         }
438         result->name = "ntdomain";
439         result->auth = check_ntdomain_security;
440
441         *auth_method = result;
442         return NT_STATUS_OK;
443 }
444
445
446 /****************************************************************************
447  Check for a valid username and password in a trusted domain
448 ****************************************************************************/
449
450 static NTSTATUS check_trustdomain_security(const struct auth_context *auth_context,
451                                            void *my_private_data, 
452                                            TALLOC_CTX *mem_ctx,
453                                            const struct auth_usersupplied_info *user_info,
454                                            struct auth_serversupplied_info **server_info)
455 {
456         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
457         unsigned char trust_md4_password[16];
458         char *trust_password;
459         fstring dc_name;
460         struct sockaddr_storage dc_ss;
461
462         if (!user_info || !server_info || !auth_context) {
463                 DEBUG(1,("check_trustdomain_security: Critical variables not present.  Failing.\n"));
464                 return NT_STATUS_INVALID_PARAMETER;
465         }
466
467         DEBUG(10, ("Check auth for: [%s]\n", user_info->mapped.account_name));
468
469         /* 
470          * Check that the requested domain is not our own machine name or domain name.
471          */
472
473         if( strequal(get_global_sam_name(), user_info->mapped.domain_name)) {
474                 DEBUG(3,("check_trustdomain_security: Requested domain [%s] was for this machine.\n",
475                         user_info->mapped.domain_name));
476                 return NT_STATUS_NOT_IMPLEMENTED;
477         }
478
479         /* No point is bothering if this is not a trusted domain.
480            This return makes "map to guest = bad user" work again.
481            The logic is that if we know nothing about the domain, that
482            user is not known to us and does not exist */
483
484         if ( !is_trusted_domain( user_info->mapped.domain_name ) )
485                 return NT_STATUS_NOT_IMPLEMENTED;
486
487         /*
488          * Get the trusted account password for the trusted domain
489          * No need to become_root() as secrets_init() is done at startup.
490          */
491
492         if (!pdb_get_trusteddom_pw(user_info->mapped.domain_name, &trust_password,
493                                    NULL, NULL)) {
494                 DEBUG(0, ("check_trustdomain_security: could not fetch trust "
495                           "account password for domain %s\n",
496                           user_info->mapped.domain_name));
497                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
498         }
499
500 #ifdef DEBUG_PASSWORD
501         DEBUG(100, ("Trust password for domain %s is %s\n", user_info->mapped.domain_name,
502                     trust_password));
503 #endif
504         E_md4hash(trust_password, trust_md4_password);
505         SAFE_FREE(trust_password);
506
507 #if 0
508         /* Test if machine password is expired and need to be changed */
509         if (time(NULL) > last_change_time + (time_t)lp_machine_password_timeout())
510         {
511                 global_machine_password_needs_changing = True;
512         }
513 #endif
514
515         /* use get_dc_name() for consistency even through we know that it will be 
516            a netbios name */
517
518         if ( !get_dc_name(user_info->mapped.domain_name, NULL, dc_name, &dc_ss) ) {
519                 DEBUG(5,("check_trustdomain_security: unable to locate a DC for domain %s\n",
520                         user_info->mapped.domain_name));
521                 return NT_STATUS_NO_LOGON_SERVERS;
522         }
523
524         nt_status = domain_client_validate(mem_ctx,
525                                         user_info,
526                                         user_info->mapped.domain_name,
527                                         (uchar *)auth_context->challenge.data,
528                                         server_info,
529                                         dc_name,
530                                         &dc_ss);
531
532         return nt_status;
533 }
534
535 /* module initialisation */
536 static NTSTATUS auth_init_trustdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method) 
537 {
538         struct auth_methods *result;
539
540         result = TALLOC_ZERO_P(auth_context, struct auth_methods);
541         if (result == NULL) {
542                 return NT_STATUS_NO_MEMORY;
543         }
544         result->name = "trustdomain";
545         result->auth = check_trustdomain_security;
546
547         *auth_method = result;
548         return NT_STATUS_OK;
549 }
550
551 NTSTATUS auth_domain_init(void) 
552 {
553         smb_register_auth(AUTH_INTERFACE_VERSION, "trustdomain", auth_init_trustdomain);
554         smb_register_auth(AUTH_INTERFACE_VERSION, "ntdomain", auth_init_ntdomain);
555         return NT_STATUS_OK;
556 }