2 Unix SMB/CIFS implementation.
3 Authenticate against a netlogon pipe listening on a unix domain socket
4 Copyright (C) Volker Lendecke 2008
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #include "../libcli/auth/libcli_auth.h"
24 #define DBGC_CLASS DBGC_AUTH
26 static NTSTATUS
netlogond_validate(TALLOC_CTX
*mem_ctx
,
27 const struct auth_context
*auth_context
,
28 const char *ncalrpc_sockname
,
29 uint8_t schannel_key
[16],
30 const auth_usersupplied_info
*user_info
,
31 struct netr_SamInfo3
**pinfo3
,
32 NTSTATUS
*schannel_bind_result
)
34 struct rpc_pipe_client
*p
= NULL
;
35 struct cli_pipe_auth_data
*auth
= NULL
;
36 struct netr_SamInfo3
*info3
= NULL
;
39 *schannel_bind_result
= NT_STATUS_OK
;
41 status
= rpc_pipe_open_ncalrpc(talloc_tos(), ncalrpc_sockname
,
42 &ndr_table_netlogon
.syntax_id
, &p
);
43 if (!NT_STATUS_IS_OK(status
)) {
44 DEBUG(10, ("rpc_pipe_open_ncalrpc failed: %s\n",
50 * We have to fake a struct dcinfo, so that
51 * rpccli_netlogon_sam_network_logon_ex can decrypt the session keys.
54 p
->dc
= netlogon_creds_client_init_session_key(p
, schannel_key
);
56 DEBUG(0, ("talloc failed\n"));
58 return NT_STATUS_NO_MEMORY
;
61 status
= rpccli_schannel_bind_data(p
, lp_workgroup(),
62 DCERPC_AUTH_LEVEL_PRIVACY
,
64 if (!NT_STATUS_IS_OK(status
)) {
65 DEBUG(10, ("rpccli_schannel_bind_data failed: %s\n",
71 status
= rpc_pipe_bind(p
, auth
);
72 if (!NT_STATUS_IS_OK(status
)) {
73 DEBUG(10, ("rpc_pipe_bind failed: %s\n", nt_errstr(status
)));
75 *schannel_bind_result
= status
;
79 status
= rpccli_netlogon_sam_network_logon_ex(
81 user_info
->logon_parameters
,/* flags such as 'allow
82 * workstation logon' */
83 global_myname(), /* server name */
84 user_info
->smb_name
, /* user name logging on. */
85 user_info
->client_domain
, /* domain name */
86 user_info
->wksta_name
, /* workstation name */
87 (uchar
*)auth_context
->challenge
.data
, /* 8 byte challenge. */
88 3, /* validation level */
89 user_info
->lm_resp
, /* lanman 24 byte response */
90 user_info
->nt_resp
, /* nt 24 byte response */
91 &info3
); /* info3 out */
93 DEBUG(10, ("rpccli_netlogon_sam_network_logon_ex returned %s\n",
96 if (!NT_STATUS_IS_OK(status
)) {
101 *pinfo3
= talloc_move(mem_ctx
, &info3
);
107 static char *mymachinepw(TALLOC_CTX
*mem_ctx
)
111 char *to_free
= NULL
;
115 script
= lp_parm_const_string(
116 GLOBAL_SECTION_SNUM
, "auth_netlogond", "machinepwscript",
119 if (script
== NULL
) {
120 to_free
= talloc_asprintf(talloc_tos(), "%s/%s",
121 get_dyn_SBINDIR(), "mymachinepw");
124 if (script
== NULL
) {
128 ret
= smbrun(script
, &fd
);
129 DEBUG(ret
? 0 : 3, ("mymachinepw: Running the command `%s' gave %d\n",
131 TALLOC_FREE(to_free
);
137 nread
= read(fd
, pwd
, sizeof(pwd
)-1);
141 DEBUG(3, ("mymachinepwd: Could not read password\n"));
147 if (pwd
[nread
-1] == '\n') {
151 return talloc_strdup(mem_ctx
, pwd
);
154 static NTSTATUS
check_netlogond_security(const struct auth_context
*auth_context
,
155 void *my_private_data
,
157 const auth_usersupplied_info
*user_info
,
158 auth_serversupplied_info
**server_info
)
160 TALLOC_CTX
*frame
= talloc_stackframe();
161 struct netr_SamInfo3
*info3
= NULL
;
162 struct rpc_pipe_client
*p
= NULL
;
163 struct cli_pipe_auth_data
*auth
= NULL
;
164 uint32_t neg_flags
= NETLOGON_NEG_AUTH2_ADS_FLAGS
;
165 char *plaintext_machinepw
= NULL
;
166 uint8_t machine_password
[16];
167 uint8_t schannel_key
[16];
168 NTSTATUS schannel_bind_result
, status
;
169 struct named_mutex
*mutex
= NULL
;
170 const char *ncalrpcsock
;
172 ncalrpcsock
= lp_parm_const_string(
173 GLOBAL_SECTION_SNUM
, "auth_netlogond", "socket", NULL
);
175 if (ncalrpcsock
== NULL
) {
176 ncalrpcsock
= talloc_asprintf(talloc_tos(), "%s/%s",
177 get_dyn_NCALRPCDIR(), "DEFAULT");
180 if (ncalrpcsock
== NULL
) {
181 status
= NT_STATUS_NO_MEMORY
;
185 if (!secrets_fetch_local_schannel_key(schannel_key
)) {
189 status
= netlogond_validate(talloc_tos(), auth_context
, ncalrpcsock
,
190 schannel_key
, user_info
, &info3
,
191 &schannel_bind_result
);
193 DEBUG(10, ("netlogond_validate returned %s\n", nt_errstr(status
)));
195 if (NT_STATUS_IS_OK(status
)) {
199 if (NT_STATUS_IS_OK(schannel_bind_result
)) {
201 * This is a real failure from the DC
208 mutex
= grab_named_mutex(talloc_tos(), "LOCAL_SCHANNEL_KEY", 60);
210 DEBUG(10, ("Could not get mutex LOCAL_SCHANNEL_KEY\n"));
211 status
= NT_STATUS_ACCESS_DENIED
;
215 DEBUG(10, ("schannel bind failed, setting up new key\n"));
217 status
= rpc_pipe_open_ncalrpc(talloc_tos(), ncalrpcsock
,
218 &ndr_table_netlogon
.syntax_id
, &p
);
220 if (!NT_STATUS_IS_OK(status
)) {
221 DEBUG(10, ("rpc_pipe_open_ncalrpc failed: %s\n",
226 status
= rpccli_anon_bind_data(p
, &auth
);
227 if (!NT_STATUS_IS_OK(status
)) {
228 DEBUG(10, ("rpccli_anon_bind_data failed: %s\n",
233 status
= rpc_pipe_bind(p
, auth
);
234 if (!NT_STATUS_IS_OK(status
)) {
235 DEBUG(10, ("rpc_pipe_bind failed: %s\n", nt_errstr(status
)));
239 plaintext_machinepw
= mymachinepw(talloc_tos());
240 if (plaintext_machinepw
== NULL
) {
241 status
= NT_STATUS_NO_MEMORY
;
245 E_md4hash(plaintext_machinepw
, machine_password
);
247 TALLOC_FREE(plaintext_machinepw
);
249 status
= rpccli_netlogon_setup_creds(
250 p
, global_myname(), lp_workgroup(), global_myname(),
251 global_myname(), machine_password
, SEC_CHAN_BDC
, &neg_flags
);
253 if (!NT_STATUS_IS_OK(status
)) {
254 DEBUG(10, ("rpccli_netlogon_setup_creds failed: %s\n",
259 memcpy(schannel_key
, p
->dc
->session_key
, 16);
260 secrets_store_local_schannel_key(schannel_key
);
265 * Retry the authentication with the mutex held. This way nobody else
266 * can step on our toes.
269 status
= netlogond_validate(talloc_tos(), auth_context
, ncalrpcsock
,
270 schannel_key
, user_info
, &info3
,
271 &schannel_bind_result
);
273 DEBUG(10, ("netlogond_validate returned %s\n", nt_errstr(status
)));
275 if (!NT_STATUS_IS_OK(status
)) {
281 status
= make_server_info_info3(mem_ctx
, user_info
->smb_name
,
282 user_info
->domain
, server_info
,
284 if (!NT_STATUS_IS_OK(status
)) {
285 DEBUG(10, ("make_server_info_info3 failed: %s\n",
291 status
= NT_STATUS_OK
;
298 /* module initialisation */
299 static NTSTATUS
auth_init_netlogond(struct auth_context
*auth_context
,
301 auth_methods
**auth_method
)
303 if (!make_auth_methods(auth_context
, auth_method
)) {
304 return NT_STATUS_NO_MEMORY
;
307 (*auth_method
)->name
= "netlogond";
308 (*auth_method
)->auth
= check_netlogond_security
;
312 NTSTATUS
auth_netlogond_init(void)
314 smb_register_auth(AUTH_INTERFACE_VERSION
, "netlogond",
315 auth_init_netlogond
);