source: branches/samba-3.5.x/source3/auth/auth_netlogond.c

Last change on this file was 596, checked in by Herwig Bauernfeind, 14 years ago

Samba 3.5: Update trunk to 3.5.8
File size: 8.3 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 Authenticate against a netlogon pipe listening on a unix domain socket
4 Copyright (C) Volker Lendecke 2008
5
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.
10
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.
15
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/>.
18*/
19
20#include "includes.h"
21#include "../libcli/auth/libcli_auth.h"
22
23#undef DBGC_CLASS
24#define DBGC_CLASS DBGC_AUTH
25
26static 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)
33{
34 struct rpc_pipe_client *p = NULL;
35 struct cli_pipe_auth_data *auth = NULL;
36 struct netr_SamInfo3 *info3 = NULL;
37 NTSTATUS status;
38
39 *schannel_bind_result = NT_STATUS_OK;
40
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",
45 nt_errstr(status)));
46 return status;
47 }
48
49 /*
50 * We have to fake a struct dcinfo, so that
51 * rpccli_netlogon_sam_network_logon_ex can decrypt the session keys.
52 */
53
54 p->dc = netlogon_creds_client_init_session_key(p, schannel_key);
55 if (p->dc == NULL) {
56 DEBUG(0, ("talloc failed\n"));
57 TALLOC_FREE(p);
58 return NT_STATUS_NO_MEMORY;
59 }
60
61 status = rpccli_schannel_bind_data(p, lp_workgroup(),
62 DCERPC_AUTH_LEVEL_PRIVACY,
63 p->dc, &auth);
64 if (!NT_STATUS_IS_OK(status)) {
65 DEBUG(10, ("rpccli_schannel_bind_data failed: %s\n",
66 nt_errstr(status)));
67 TALLOC_FREE(p);
68 return status;
69 }
70
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)));
74 TALLOC_FREE(p);
75 *schannel_bind_result = status;
76 return status;
77 }
78
79 status = rpccli_netlogon_sam_network_logon_ex(
80 p, p,
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 */
92
93 DEBUG(10, ("rpccli_netlogon_sam_network_logon_ex returned %s\n",
94 nt_errstr(status)));
95
96 if (!NT_STATUS_IS_OK(status)) {
97 TALLOC_FREE(p);
98 return status;
99 }
100
101 *pinfo3 = talloc_move(mem_ctx, &info3);
102
103 TALLOC_FREE(p);
104 return NT_STATUS_OK;
105}
106
107static char *mymachinepw(TALLOC_CTX *mem_ctx)
108{
109 fstring pwd;
110 const char *script;
111 char *to_free = NULL;
112 ssize_t nread;
113 int ret, fd;
114
115 script = lp_parm_const_string(
116 GLOBAL_SECTION_SNUM, "auth_netlogond", "machinepwscript",
117 NULL);
118
119 if (script == NULL) {
120 to_free = talloc_asprintf(talloc_tos(), "%s/%s",
121 get_dyn_SBINDIR(), "mymachinepw");
122 script = to_free;
123 }
124 if (script == NULL) {
125 return NULL;
126 }
127
128 ret = smbrun(script, &fd);
129 DEBUG(ret ? 0 : 3, ("mymachinepw: Running the command `%s' gave %d\n",
130 script, ret));
131 TALLOC_FREE(to_free);
132
133 if (ret != 0) {
134 return NULL;
135 }
136
137 nread = read(fd, pwd, sizeof(pwd)-1);
138 close(fd);
139
140 if (nread <= 0) {
141 DEBUG(3, ("mymachinepwd: Could not read password\n"));
142 return NULL;
143 }
144
145 pwd[nread] = '\0';
146
147 if (pwd[nread-1] == '\n') {
148 pwd[nread-1] = '\0';
149 }
150
151 return talloc_strdup(mem_ctx, pwd);
152}
153
154static NTSTATUS check_netlogond_security(const struct auth_context *auth_context,
155 void *my_private_data,
156 TALLOC_CTX *mem_ctx,
157 const auth_usersupplied_info *user_info,
158 auth_serversupplied_info **server_info)
159{
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;
171
172 ncalrpcsock = lp_parm_const_string(
173 GLOBAL_SECTION_SNUM, "auth_netlogond", "socket", NULL);
174
175 if (ncalrpcsock == NULL) {
176 ncalrpcsock = talloc_asprintf(talloc_tos(), "%s/%s",
177 get_dyn_NCALRPCDIR(), "DEFAULT");
178 }
179
180 if (ncalrpcsock == NULL) {
181 status = NT_STATUS_NO_MEMORY;
182 goto done;
183 }
184
185 if (!secrets_fetch_local_schannel_key(schannel_key)) {
186 goto new_key;
187 }
188
189 status = netlogond_validate(talloc_tos(), auth_context, ncalrpcsock,
190 schannel_key, user_info, &info3,
191 &schannel_bind_result);
192
193 DEBUG(10, ("netlogond_validate returned %s\n", nt_errstr(status)));
194
195 if (NT_STATUS_IS_OK(status)) {
196 goto okay;
197 }
198
199 if (NT_STATUS_IS_OK(schannel_bind_result)) {
200 /*
201 * This is a real failure from the DC
202 */
203 goto done;
204 }
205
206 new_key:
207
208 mutex = grab_named_mutex(talloc_tos(), "LOCAL_SCHANNEL_KEY", 60);
209 if (mutex == NULL) {
210 DEBUG(10, ("Could not get mutex LOCAL_SCHANNEL_KEY\n"));
211 status = NT_STATUS_ACCESS_DENIED;
212 goto done;
213 }
214
215 DEBUG(10, ("schannel bind failed, setting up new key\n"));
216
217 status = rpc_pipe_open_ncalrpc(talloc_tos(), ncalrpcsock,
218 &ndr_table_netlogon.syntax_id, &p);
219
220 if (!NT_STATUS_IS_OK(status)) {
221 DEBUG(10, ("rpc_pipe_open_ncalrpc failed: %s\n",
222 nt_errstr(status)));
223 goto done;
224 }
225
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",
229 nt_errstr(status)));
230 goto done;
231 }
232
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)));
236 goto done;
237 }
238
239 plaintext_machinepw = mymachinepw(talloc_tos());
240 if (plaintext_machinepw == NULL) {
241 status = NT_STATUS_NO_MEMORY;
242 goto done;
243 }
244
245 E_md4hash(plaintext_machinepw, machine_password);
246
247 TALLOC_FREE(plaintext_machinepw);
248
249 status = rpccli_netlogon_setup_creds(
250 p, global_myname(), lp_workgroup(), global_myname(),
251 global_myname(), machine_password, SEC_CHAN_BDC, &neg_flags);
252
253 if (!NT_STATUS_IS_OK(status)) {
254 DEBUG(10, ("rpccli_netlogon_setup_creds failed: %s\n",
255 nt_errstr(status)));
256 goto done;
257 }
258
259 memcpy(schannel_key, p->dc->session_key, 16);
260 secrets_store_local_schannel_key(schannel_key);
261
262 TALLOC_FREE(p);
263
264 /*
265 * Retry the authentication with the mutex held. This way nobody else
266 * can step on our toes.
267 */
268
269 status = netlogond_validate(talloc_tos(), auth_context, ncalrpcsock,
270 schannel_key, user_info, &info3,
271 &schannel_bind_result);
272
273 DEBUG(10, ("netlogond_validate returned %s\n", nt_errstr(status)));
274
275 if (!NT_STATUS_IS_OK(status)) {
276 goto done;
277 }
278
279 okay:
280
281 status = make_server_info_info3(mem_ctx, user_info->smb_name,
282 user_info->domain, server_info,
283 info3);
284 if (!NT_STATUS_IS_OK(status)) {
285 DEBUG(10, ("make_server_info_info3 failed: %s\n",
286 nt_errstr(status)));
287 TALLOC_FREE(frame);
288 return status;
289 }
290
291 status = NT_STATUS_OK;
292
293 done:
294 TALLOC_FREE(frame);
295 return status;
296}
297
298/* module initialisation */
299static NTSTATUS auth_init_netlogond(struct auth_context *auth_context,
300 const char *param,
301 auth_methods **auth_method)
302{
303 if (!make_auth_methods(auth_context, auth_method)) {
304 return NT_STATUS_NO_MEMORY;
305 }
306
307 (*auth_method)->name = "netlogond";
308 (*auth_method)->auth = check_netlogond_security;
309 return NT_STATUS_OK;
310}
311
312NTSTATUS auth_netlogond_init(void)
313{
314 smb_register_auth(AUTH_INTERFACE_VERSION, "netlogond",
315 auth_init_netlogond);
316 return NT_STATUS_OK;
317}
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