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"
22 #include "../librpc/gen_ndr/ndr_netlogon.h"
23 #include "rpc_client/cli_netlogon.h"
26 #define DBGC_CLASS DBGC_AUTH
28 static NTSTATUS
netlogond_validate(TALLOC_CTX
*mem_ctx
,
29 const struct auth_context
*auth_context
,
30 const char *ncalrpc_sockname
,
31 uint8_t schannel_key
[16],
32 const struct auth_usersupplied_info
*user_info
,
33 struct netr_SamInfo3
**pinfo3
,
34 NTSTATUS
*schannel_bind_result
)
36 struct rpc_pipe_client
*p
= NULL
;
37 struct cli_pipe_auth_data
*auth
= NULL
;
38 struct netr_SamInfo3
*info3
= NULL
;
41 *schannel_bind_result
= NT_STATUS_OK
;
43 status
= rpc_pipe_open_ncalrpc(talloc_tos(), ncalrpc_sockname
,
44 &ndr_table_netlogon
.syntax_id
, &p
);
45 if (!NT_STATUS_IS_OK(status
)) {
46 DEBUG(10, ("rpc_pipe_open_ncalrpc failed: %s\n",
52 * We have to fake a struct dcinfo, so that
53 * rpccli_netlogon_sam_network_logon_ex can decrypt the session keys.
56 p
->dc
= netlogon_creds_client_init_session_key(p
, schannel_key
);
58 DEBUG(0, ("talloc failed\n"));
60 return NT_STATUS_NO_MEMORY
;
63 status
= rpccli_schannel_bind_data(p
, lp_workgroup(),
64 DCERPC_AUTH_LEVEL_PRIVACY
,
66 if (!NT_STATUS_IS_OK(status
)) {
67 DEBUG(10, ("rpccli_schannel_bind_data failed: %s\n",
73 status
= rpc_pipe_bind(p
, auth
);
74 if (!NT_STATUS_IS_OK(status
)) {
75 DEBUG(10, ("rpc_pipe_bind failed: %s\n", nt_errstr(status
)));
77 *schannel_bind_result
= status
;
81 status
= rpccli_netlogon_sam_network_logon_ex(
83 user_info
->logon_parameters
, /* flags such as 'allow
84 * workstation logon' */
85 global_myname(), /* server name */
86 user_info
->smb_name
, /* user name logging on. */
87 user_info
->client_domain
, /* domain name */
88 user_info
->workstation_name
, /* workstation name */
89 (uchar
*)auth_context
->challenge
.data
, /* 8 byte challenge. */
90 user_info
->lm_resp
, /* lanman 24 byte response */
91 user_info
->nt_resp
, /* nt 24 byte response */
92 &info3
); /* info3 out */
94 DEBUG(10, ("rpccli_netlogon_sam_network_logon_ex returned %s\n",
97 if (!NT_STATUS_IS_OK(status
)) {
102 *pinfo3
= talloc_move(mem_ctx
, &info3
);
108 static char *mymachinepw(TALLOC_CTX
*mem_ctx
)
112 char *to_free
= NULL
;
116 script
= lp_parm_const_string(
117 GLOBAL_SECTION_SNUM
, "auth_netlogond", "machinepwscript",
120 if (script
== NULL
) {
121 to_free
= talloc_asprintf(talloc_tos(), "%s/%s",
122 get_dyn_SBINDIR(), "mymachinepw");
125 if (script
== NULL
) {
129 ret
= smbrun(script
, &fd
);
130 DEBUG(ret
? 0 : 3, ("mymachinepw: Running the command `%s' gave %d\n",
132 TALLOC_FREE(to_free
);
138 nread
= read(fd
, pwd
, sizeof(pwd
)-1);
142 DEBUG(3, ("mymachinepwd: Could not read password\n"));
148 if (pwd
[nread
-1] == '\n') {
152 return talloc_strdup(mem_ctx
, pwd
);
155 static NTSTATUS
check_netlogond_security(const struct auth_context
*auth_context
,
156 void *my_private_data
,
158 const struct auth_usersupplied_info
*user_info
,
159 struct auth_serversupplied_info
**server_info
)
161 TALLOC_CTX
*frame
= talloc_stackframe();
162 struct netr_SamInfo3
*info3
= NULL
;
163 struct rpc_pipe_client
*p
= NULL
;
164 struct cli_pipe_auth_data
*auth
= NULL
;
165 uint32_t neg_flags
= NETLOGON_NEG_AUTH2_ADS_FLAGS
;
166 char *plaintext_machinepw
= NULL
;
167 uint8_t machine_password
[16];
168 uint8_t schannel_key
[16];
169 NTSTATUS schannel_bind_result
, status
;
170 struct named_mutex
*mutex
= NULL
;
171 const char *ncalrpcsock
;
173 DEBUG(10, ("Check auth for: [%s]\n", user_info
->internal_username
));
175 ncalrpcsock
= lp_parm_const_string(
176 GLOBAL_SECTION_SNUM
, "auth_netlogond", "socket", NULL
);
178 if (ncalrpcsock
== NULL
) {
179 ncalrpcsock
= talloc_asprintf(talloc_tos(), "%s/%s",
180 get_dyn_NCALRPCDIR(), "DEFAULT");
183 if (ncalrpcsock
== NULL
) {
184 status
= NT_STATUS_NO_MEMORY
;
188 if (!secrets_fetch_local_schannel_key(schannel_key
)) {
192 status
= netlogond_validate(talloc_tos(), auth_context
, ncalrpcsock
,
193 schannel_key
, user_info
, &info3
,
194 &schannel_bind_result
);
196 DEBUG(10, ("netlogond_validate returned %s\n", nt_errstr(status
)));
198 if (NT_STATUS_IS_OK(status
)) {
202 if (NT_STATUS_IS_OK(schannel_bind_result
)) {
204 * This is a real failure from the DC
211 mutex
= grab_named_mutex(talloc_tos(), "LOCAL_SCHANNEL_KEY", 60);
213 DEBUG(10, ("Could not get mutex LOCAL_SCHANNEL_KEY\n"));
214 status
= NT_STATUS_ACCESS_DENIED
;
218 DEBUG(10, ("schannel bind failed, setting up new key\n"));
220 status
= rpc_pipe_open_ncalrpc(talloc_tos(), ncalrpcsock
,
221 &ndr_table_netlogon
.syntax_id
, &p
);
223 if (!NT_STATUS_IS_OK(status
)) {
224 DEBUG(10, ("rpc_pipe_open_ncalrpc failed: %s\n",
229 status
= rpccli_anon_bind_data(p
, &auth
);
230 if (!NT_STATUS_IS_OK(status
)) {
231 DEBUG(10, ("rpccli_anon_bind_data failed: %s\n",
236 status
= rpc_pipe_bind(p
, auth
);
237 if (!NT_STATUS_IS_OK(status
)) {
238 DEBUG(10, ("rpc_pipe_bind failed: %s\n", nt_errstr(status
)));
242 plaintext_machinepw
= mymachinepw(talloc_tos());
243 if (plaintext_machinepw
== NULL
) {
244 status
= NT_STATUS_NO_MEMORY
;
248 E_md4hash(plaintext_machinepw
, machine_password
);
250 TALLOC_FREE(plaintext_machinepw
);
252 status
= rpccli_netlogon_setup_creds(
253 p
, global_myname(), lp_workgroup(), global_myname(),
254 global_myname(), machine_password
, SEC_CHAN_BDC
, &neg_flags
);
256 if (!NT_STATUS_IS_OK(status
)) {
257 DEBUG(10, ("rpccli_netlogon_setup_creds failed: %s\n",
262 memcpy(schannel_key
, p
->dc
->session_key
, 16);
263 secrets_store_local_schannel_key(schannel_key
);
268 * Retry the authentication with the mutex held. This way nobody else
269 * can step on our toes.
272 status
= netlogond_validate(talloc_tos(), auth_context
, ncalrpcsock
,
273 schannel_key
, user_info
, &info3
,
274 &schannel_bind_result
);
276 DEBUG(10, ("netlogond_validate returned %s\n", nt_errstr(status
)));
278 if (!NT_STATUS_IS_OK(status
)) {
284 status
= make_server_info_info3(mem_ctx
, user_info
->smb_name
,
285 user_info
->domain
, server_info
,
287 if (!NT_STATUS_IS_OK(status
)) {
288 DEBUG(10, ("make_server_info_info3 failed: %s\n",
294 status
= NT_STATUS_OK
;
301 /* module initialisation */
302 static NTSTATUS
auth_init_netlogond(struct auth_context
*auth_context
,
304 auth_methods
**auth_method
)
306 struct auth_methods
*result
;
308 result
= TALLOC_ZERO_P(auth_context
, struct auth_methods
);
309 if (result
== NULL
) {
310 return NT_STATUS_NO_MEMORY
;
312 result
->name
= "netlogond";
313 result
->auth
= check_netlogond_security
;
315 *auth_method
= result
;
319 NTSTATUS
auth_netlogond_init(void)
321 smb_register_auth(AUTH_INTERFACE_VERSION
, "netlogond",
322 auth_init_netlogond
);