2 Unix SMB/CIFS implementation.
3 Authenticate against a remote domain
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Andrew Bartlett 2001
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.
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.
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/>.
22 #include "../libcli/auth/libcli_auth.h"
23 #include "../librpc/gen_ndr/ndr_netlogon.h"
24 #include "rpc_client/cli_netlogon.h"
27 #define DBGC_CLASS DBGC_AUTH
29 extern bool global_machine_password_needs_changing
;
30 static struct named_mutex
*mutex
;
33 * Change machine password (called from main loop
34 * idle timeout. Must be done as root.
37 void attempt_machine_password_change(void)
39 unsigned char trust_passwd_hash
[16];
43 if (!global_machine_password_needs_changing
) {
47 if (lp_security() != SEC_DOMAIN
) {
52 * We're in domain level security, and the code that
53 * read the machine password flagged that the machine
54 * password needs changing.
58 * First, open the machine password file with an exclusive lock.
61 lock
= secrets_get_trust_account_lock(NULL
, lp_workgroup());
64 DEBUG(0,("attempt_machine_password_change: unable to lock "
65 "the machine account password for machine %s in "
67 global_myname(), lp_workgroup() ));
71 if(!secrets_fetch_trust_account_password(lp_workgroup(),
72 trust_passwd_hash
, &lct
, NULL
)) {
73 DEBUG(0,("attempt_machine_password_change: unable to read the "
74 "machine account password for %s in domain %s.\n",
75 global_myname(), lp_workgroup()));
81 * Make sure someone else hasn't already done this.
84 if(time(NULL
) < lct
+ lp_machine_password_timeout()) {
85 global_machine_password_needs_changing
= false;
90 /* always just contact the PDC here */
92 change_trust_account_password( lp_workgroup(), NULL
);
93 global_machine_password_needs_changing
= false;
98 * Connect to a remote server for (inter)domain security authenticaion.
100 * @param cli the cli to return containing the active connection
101 * @param server either a machine name or text IP address to
103 * @param setup_creds_as domain account to setup credentials as
104 * @param sec_chan a switch value to distinguish between domain
105 * member and interdomain authentication
106 * @param trust_passwd the trust password to establish the
111 static NTSTATUS
connect_to_domain_password_server(struct cli_state
**cli
,
114 struct sockaddr_storage
*dc_ss
,
115 struct rpc_pipe_client
**pipe_ret
,
119 struct rpc_pipe_client
*netlogon_pipe
= NULL
;
125 /* TODO: Send a SAMLOGON request to determine whether this is a valid
126 logonserver. We can avoid a 30-second timeout if the DC is down
127 if the SAMLOGON request fails as it is only over UDP. */
129 /* we use a mutex to prevent two connections at once - when a
130 Win2k PDC get two connections where one hasn't completed a
131 session setup yet it will send a TCP reset to the first
132 connection (tridge) */
135 * With NT4.x DC's *all* authentication must be serialized to avoid
136 * ACCESS_DENIED errors if 2 auths are done from the same machine. JRA.
139 mutex
= grab_named_mutex(NULL
, dc_name
, 10);
141 return NT_STATUS_NO_LOGON_SERVERS
;
144 /* Attempt connection */
146 result
= cli_full_connection(cli
, global_myname(), dc_name
, dc_ss
, 0,
147 "IPC$", "IPC", "", "", "", 0, Undefined
, retry
);
149 if (!NT_STATUS_IS_OK(result
)) {
150 /* map to something more useful */
151 if (NT_STATUS_EQUAL(result
, NT_STATUS_UNSUCCESSFUL
)) {
152 result
= NT_STATUS_NO_LOGON_SERVERS
;
165 * We now have an anonymous connection to IPC$ on the domain password server.
169 * Even if the connect succeeds we need to setup the netlogon
170 * pipe here. We do this as we may just have changed the domain
171 * account password on the PDC and yet we may be talking to
172 * a BDC that doesn't have this replicated yet. In this case
173 * a successful connect to a DC needs to take the netlogon connect
174 * into account also. This patch from "Bjart Kvarme" <bjart.kvarme@usit.uio.no>.
177 /* open the netlogon pipe. */
178 if (lp_client_schannel()) {
179 /* We also setup the creds chain in the open_schannel call. */
180 result
= cli_rpc_pipe_open_schannel(
181 *cli
, &ndr_table_netlogon
.syntax_id
, NCACN_NP
,
182 DCERPC_AUTH_LEVEL_PRIVACY
, domain
, &netlogon_pipe
);
184 result
= cli_rpc_pipe_open_noauth(
185 *cli
, &ndr_table_netlogon
.syntax_id
, &netlogon_pipe
);
188 if (!NT_STATUS_IS_OK(result
)) {
189 DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
190 machine %s. Error was : %s.\n", dc_name
, nt_errstr(result
)));
197 if (!lp_client_schannel()) {
198 /* We need to set up a creds chain on an unauthenticated netlogon pipe. */
199 uint32_t neg_flags
= NETLOGON_NEG_AUTH2_ADS_FLAGS
;
200 enum netr_SchannelType sec_chan_type
= 0;
201 unsigned char machine_pwd
[16];
202 const char *account_name
;
204 if (!get_trust_pw_hash(domain
, machine_pwd
, &account_name
,
207 DEBUG(0, ("connect_to_domain_password_server: could not fetch "
208 "trust account password for domain '%s'\n",
213 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO
;
216 result
= rpccli_netlogon_setup_creds(netlogon_pipe
,
217 dc_name
, /* server name */
219 global_myname(), /* client name */
220 account_name
, /* machine account name */
225 if (!NT_STATUS_IS_OK(result
)) {
234 DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
235 machine %s. Error was : %s.\n", dc_name
, cli_errstr(*cli
)));
239 return NT_STATUS_NO_LOGON_SERVERS
;
242 /* We exit here with the mutex *locked*. JRA */
244 *pipe_ret
= netlogon_pipe
;
249 /***********************************************************************
250 Do the same as security=server, but using NT Domain calls and a session
251 key from the machine password. If the server parameter is specified
252 use it, otherwise figure out a server from the 'password server' param.
253 ************************************************************************/
255 static NTSTATUS
domain_client_validate(TALLOC_CTX
*mem_ctx
,
256 const struct auth_usersupplied_info
*user_info
,
259 struct auth_serversupplied_info
**server_info
,
261 struct sockaddr_storage
*dc_ss
)
264 struct netr_SamInfo3
*info3
= NULL
;
265 struct cli_state
*cli
= NULL
;
266 struct rpc_pipe_client
*netlogon_pipe
= NULL
;
267 NTSTATUS nt_status
= NT_STATUS_NO_LOGON_SERVERS
;
272 * At this point, smb_apasswd points to the lanman response to
273 * the challenge in local_challenge, and smb_ntpasswd points to
274 * the NT response to the challenge in local_challenge. Ship
275 * these over the secure channel to a domain controller and
276 * see if they were valid.
279 /* rety loop for robustness */
281 for (i
= 0; !NT_STATUS_IS_OK(nt_status
) && retry
&& (i
< 3); i
++) {
282 nt_status
= connect_to_domain_password_server(&cli
,
290 if ( !NT_STATUS_IS_OK(nt_status
) ) {
291 DEBUG(0,("domain_client_validate: Domain password server not available.\n"));
292 if (NT_STATUS_EQUAL(nt_status
, NT_STATUS_ACCESS_DENIED
)) {
293 return NT_STATUS_TRUSTED_RELATIONSHIP_FAILURE
;
298 /* store a successful connection */
300 saf_store( domain
, cli
->desthost
);
303 * If this call succeeds, we now have lots of info about the user
304 * in the info3 structure.
307 nt_status
= rpccli_netlogon_sam_network_logon(netlogon_pipe
,
309 user_info
->logon_parameters
,/* flags such as 'allow workstation logon' */
310 dc_name
, /* server name */
311 user_info
->smb_name
, /* user name logging on. */
312 user_info
->client_domain
, /* domain name */
313 user_info
->workstation_name
,/* workstation name */
314 chal
, /* 8 byte challenge. */
315 user_info
->lm_resp
, /* lanman 24 byte response */
316 user_info
->nt_resp
, /* nt 24 byte response */
317 &info3
); /* info3 out */
319 /* Let go as soon as possible so we avoid any potential deadlocks
320 with winbind lookup up users or groups. */
324 if (!NT_STATUS_IS_OK(nt_status
)) {
325 DEBUG(0,("domain_client_validate: unable to validate password "
326 "for user %s in domain %s to Domain controller %s. "
327 "Error was %s.\n", user_info
->smb_name
,
328 user_info
->client_domain
, dc_name
,
329 nt_errstr(nt_status
)));
331 /* map to something more useful */
332 if (NT_STATUS_EQUAL(nt_status
, NT_STATUS_UNSUCCESSFUL
)) {
333 nt_status
= NT_STATUS_NO_LOGON_SERVERS
;
336 nt_status
= make_server_info_info3(mem_ctx
,
342 if (NT_STATUS_IS_OK(nt_status
)) {
343 (*server_info
)->nss_token
|= user_info
->was_mapped
;
345 if ( ! (*server_info
)->guest
) {
346 /* if a real user check pam account restrictions */
347 /* only really perfomed if "obey pam restriction" is true */
348 nt_status
= smb_pam_accountcheck((*server_info
)->unix_name
);
349 if ( !NT_STATUS_IS_OK(nt_status
)) {
350 DEBUG(1, ("PAM account restriction prevents user login\n"));
358 netsamlogon_cache_store(user_info
->smb_name
, info3
);
362 /* Note - once the cli stream is shutdown the mem_ctx used
363 to allocate the other_sids and gids structures has been deleted - so
364 these pointers are no longer valid..... */
370 /****************************************************************************
371 Check for a valid username and password in security=domain mode.
372 ****************************************************************************/
374 static NTSTATUS
check_ntdomain_security(const struct auth_context
*auth_context
,
375 void *my_private_data
,
377 const struct auth_usersupplied_info
*user_info
,
378 struct auth_serversupplied_info
**server_info
)
380 NTSTATUS nt_status
= NT_STATUS_LOGON_FAILURE
;
381 const char *domain
= lp_workgroup();
383 struct sockaddr_storage dc_ss
;
385 if ( lp_server_role() != ROLE_DOMAIN_MEMBER
) {
386 DEBUG(0,("check_ntdomain_security: Configuration error! Cannot use "
387 "ntdomain auth method when not a member of a domain.\n"));
388 return NT_STATUS_NOT_IMPLEMENTED
;
391 if (!user_info
|| !server_info
|| !auth_context
) {
392 DEBUG(1,("check_ntdomain_security: Critical variables not present. Failing.\n"));
393 return NT_STATUS_INVALID_PARAMETER
;
396 DEBUG(10, ("Check auth for: [%s]\n", user_info
->internal_username
));
399 * Check that the requested domain is not our own machine name.
400 * If it is, we should never check the PDC here, we use our own local
404 if(strequal(get_global_sam_name(), user_info
->domain
)) {
405 DEBUG(3,("check_ntdomain_security: Requested domain was for this machine.\n"));
406 return NT_STATUS_NOT_IMPLEMENTED
;
409 /* we need our DC to send the net_sam_logon() request to */
411 if ( !get_dc_name(domain
, NULL
, dc_name
, &dc_ss
) ) {
412 DEBUG(5,("check_ntdomain_security: unable to locate a DC for domain %s\n",
414 return NT_STATUS_NO_LOGON_SERVERS
;
417 nt_status
= domain_client_validate(mem_ctx
,
420 (uchar
*)auth_context
->challenge
.data
,
428 /* module initialisation */
429 static NTSTATUS
auth_init_ntdomain(struct auth_context
*auth_context
, const char* param
, auth_methods
**auth_method
)
431 struct auth_methods
*result
;
433 result
= TALLOC_ZERO_P(auth_context
, struct auth_methods
);
434 if (result
== NULL
) {
435 return NT_STATUS_NO_MEMORY
;
437 result
->name
= "ntdomain";
438 result
->auth
= check_ntdomain_security
;
440 *auth_method
= result
;
445 /****************************************************************************
446 Check for a valid username and password in a trusted domain
447 ****************************************************************************/
449 static NTSTATUS
check_trustdomain_security(const struct auth_context
*auth_context
,
450 void *my_private_data
,
452 const struct auth_usersupplied_info
*user_info
,
453 struct auth_serversupplied_info
**server_info
)
455 NTSTATUS nt_status
= NT_STATUS_LOGON_FAILURE
;
456 unsigned char trust_md4_password
[16];
457 char *trust_password
;
459 struct sockaddr_storage dc_ss
;
461 if (!user_info
|| !server_info
|| !auth_context
) {
462 DEBUG(1,("check_trustdomain_security: Critical variables not present. Failing.\n"));
463 return NT_STATUS_INVALID_PARAMETER
;
466 DEBUG(10, ("Check auth for: [%s]\n", user_info
->internal_username
));
469 * Check that the requested domain is not our own machine name or domain name.
472 if( strequal(get_global_sam_name(), user_info
->domain
)) {
473 DEBUG(3,("check_trustdomain_security: Requested domain [%s] was for this machine.\n",
475 return NT_STATUS_NOT_IMPLEMENTED
;
478 /* No point is bothering if this is not a trusted domain.
479 This return makes "map to guest = bad user" work again.
480 The logic is that if we know nothing about the domain, that
481 user is not known to us and does not exist */
483 if ( !is_trusted_domain( user_info
->domain
) )
484 return NT_STATUS_NOT_IMPLEMENTED
;
487 * Get the trusted account password for the trusted domain
488 * No need to become_root() as secrets_init() is done at startup.
491 if (!pdb_get_trusteddom_pw(user_info
->domain
, &trust_password
,
493 DEBUG(0, ("check_trustdomain_security: could not fetch trust "
494 "account password for domain %s\n",
496 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO
;
499 #ifdef DEBUG_PASSWORD
500 DEBUG(100, ("Trust password for domain %s is %s\n", user_info
->domain
,
503 E_md4hash(trust_password
, trust_md4_password
);
504 SAFE_FREE(trust_password
);
507 /* Test if machine password is expired and need to be changed */
508 if (time(NULL
) > last_change_time
+ (time_t)lp_machine_password_timeout())
510 global_machine_password_needs_changing
= True
;
514 /* use get_dc_name() for consistency even through we know that it will be
517 if ( !get_dc_name(user_info
->domain
, NULL
, dc_name
, &dc_ss
) ) {
518 DEBUG(5,("check_trustdomain_security: unable to locate a DC for domain %s\n",
520 return NT_STATUS_NO_LOGON_SERVERS
;
523 nt_status
= domain_client_validate(mem_ctx
,
526 (uchar
*)auth_context
->challenge
.data
,
534 /* module initialisation */
535 static NTSTATUS
auth_init_trustdomain(struct auth_context
*auth_context
, const char* param
, auth_methods
**auth_method
)
537 struct auth_methods
*result
;
539 result
= TALLOC_ZERO_P(auth_context
, struct auth_methods
);
540 if (result
== NULL
) {
541 return NT_STATUS_NO_MEMORY
;
543 result
->name
= "trustdomain";
544 result
->auth
= check_trustdomain_security
;
546 *auth_method
= result
;
550 NTSTATUS
auth_domain_init(void)
552 smb_register_auth(AUTH_INTERFACE_VERSION
, "trustdomain", auth_init_trustdomain
);
553 smb_register_auth(AUTH_INTERFACE_VERSION
, "ntdomain", auth_init_ntdomain
);