2 Unix SMB/CIFS implementation.
3 Authenticate against Samba4's auth subsystem
4 Copyright (C) Volker Lendecke 2008
5 Copyright (C) Andrew Bartlett 2010
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 "source3/include/auth.h"
23 #include "source4/auth/auth.h"
24 #include "auth/auth_sam_reply.h"
25 #include "param/param.h"
26 #include "source4/lib/events/events.h"
27 #include "source4/lib/messaging/messaging.h"
28 #include "auth/gensec/gensec.h"
29 #include "auth/credentials/credentials.h"
32 #define DBGC_CLASS DBGC_AUTH
34 static NTSTATUS
make_auth4_context_s4(const struct auth_context
*auth_context
,
36 struct auth4_context
**auth4_context
);
38 static struct idr_context
*task_id_tree
;
40 static int free_task_id(struct server_id
*server_id
)
42 idr_remove(task_id_tree
, server_id
->task_id
);
46 /* Return a server_id with a unique task_id element. Free the
47 * returned pointer to de-allocate the task_id via a talloc destructor
48 * (ie, use talloc_free()) */
49 static struct server_id
*new_server_id_task(TALLOC_CTX
*mem_ctx
)
51 struct server_id
*server_id
;
54 task_id_tree
= idr_init(NULL
);
60 server_id
= talloc(mem_ctx
, struct server_id
);
65 *server_id
= procid_self();
67 /* 0 is the default server_id, so we need to start with 1 */
68 task_id
= idr_get_new_above(task_id_tree
, server_id
, 1, INT32_MAX
);
71 talloc_free(server_id
);
75 talloc_set_destructor(server_id
, free_task_id
);
76 server_id
->task_id
= task_id
;
81 * This module is not an ordinary authentication module. It is really
82 * a way to redirect the whole authentication and authorization stack
83 * to use the source4 auth code, not a way to just handle NTLM
86 * See the comments above each function for how that hook changes the
91 * This hook is currently used by winbindd only, as all other NTLM
92 * logins go via the hooks provided by make_auth4_context_s4() below.
94 * This is only left in case we find a way that it might become useful
95 * in future. Importantly, this routine returns the information
96 * needed for a NETLOGON SamLogon, not what is needed to establish a
99 * We expect we may use this hook in the source3/ winbind when this
100 * services the AD DC. It is tested via pdbtest.
103 static NTSTATUS
check_samba4_security(const struct auth_context
*auth_context
,
104 void *my_private_data
,
106 const struct auth_usersupplied_info
*user_info
,
107 struct auth_serversupplied_info
**server_info
)
109 TALLOC_CTX
*frame
= talloc_stackframe();
110 struct netr_SamInfo3
*info3
= NULL
;
112 struct auth_user_info_dc
*user_info_dc
;
113 struct auth4_context
*auth4_context
;
115 nt_status
= make_auth4_context_s4(auth_context
, mem_ctx
, &auth4_context
);
116 if (!NT_STATUS_IS_OK(nt_status
)) {
121 nt_status
= auth_context_set_challenge(auth4_context
, auth_context
->challenge
.data
, "auth_samba4");
122 if (!NT_STATUS_IS_OK(nt_status
)) {
123 TALLOC_FREE(auth4_context
);
128 nt_status
= auth_check_password(auth4_context
, auth4_context
, user_info
, &user_info_dc
);
129 if (!NT_STATUS_IS_OK(nt_status
)) {
130 TALLOC_FREE(auth4_context
);
135 nt_status
= auth_convert_user_info_dc_saminfo3(mem_ctx
,
138 if (NT_STATUS_IS_OK(nt_status
)) {
139 /* We need the strings from the server_info to be valid as long as the info3 is around */
140 talloc_steal(info3
, user_info_dc
);
142 talloc_free(auth4_context
);
144 if (!NT_STATUS_IS_OK(nt_status
)) {
148 nt_status
= make_server_info_info3(mem_ctx
, user_info
->client
.account_name
,
149 user_info
->mapped
.domain_name
, server_info
,
151 if (!NT_STATUS_IS_OK(nt_status
)) {
152 DEBUG(10, ("make_server_info_info3 failed: %s\n",
153 nt_errstr(nt_status
)));
158 nt_status
= NT_STATUS_OK
;
166 * Hook to allow the source4 set of GENSEC modules to handle
167 * blob-based authentication mechanisms, without directly linking the
170 * This may eventually go away, when the GSSAPI acceptors are merged,
171 * when we will just rely on the make_auth4_context_s4 hook instead.
173 * Even for NTLMSSP, which has a common module, significant parts of
174 * the behaviour are overridden here, because it uses the source4 NTLM
175 * stack and the source4 mapping between the PAC/SamLogon response and
178 * It is important to override all this to ensure that the exact same
179 * token is generated and used in the SMB and LDAP servers, for NTLM
182 static NTSTATUS
prepare_gensec(struct auth_context
*auth_context
,
184 struct gensec_security
**gensec_context
)
187 struct loadparm_context
*lp_ctx
;
188 struct tevent_context
*event_ctx
;
189 TALLOC_CTX
*frame
= talloc_stackframe();
190 struct gensec_security
*gensec_ctx
;
191 struct imessaging_context
*msg_ctx
;
192 struct cli_credentials
*server_credentials
;
193 struct server_id
*server_id
;
195 lp_ctx
= loadparm_init_s3(frame
, loadparm_s3_helpers());
196 if (lp_ctx
== NULL
) {
197 DEBUG(1, ("loadparm_init_s3 failed\n"));
199 return NT_STATUS_INVALID_SERVER_STATE
;
201 event_ctx
= s4_event_context_init(frame
);
202 if (event_ctx
== NULL
) {
203 DEBUG(1, ("s4_event_context_init failed\n"));
205 return NT_STATUS_INVALID_SERVER_STATE
;
208 server_id
= new_server_id_task(frame
);
209 if (server_id
== NULL
) {
210 DEBUG(1, ("new_server_id_task failed\n"));
212 return NT_STATUS_INVALID_SERVER_STATE
;
215 msg_ctx
= imessaging_init(frame
,
219 if (msg_ctx
== NULL
) {
220 DEBUG(1, ("imessaging_init failed\n"));
222 return NT_STATUS_INVALID_SERVER_STATE
;
225 talloc_reparent(frame
, msg_ctx
, server_id
);
228 = cli_credentials_init(frame
);
229 if (!server_credentials
) {
230 DEBUG(1, ("Failed to init server credentials"));
232 return NT_STATUS_INVALID_SERVER_STATE
;
235 cli_credentials_set_conf(server_credentials
, lp_ctx
);
236 status
= cli_credentials_set_machine_account(server_credentials
, lp_ctx
);
237 if (!NT_STATUS_IS_OK(status
)) {
238 DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(status
)));
239 talloc_free(server_credentials
);
240 server_credentials
= NULL
;
243 status
= samba_server_gensec_start(mem_ctx
,
245 lp_ctx
, server_credentials
, "cifs",
247 if (!NT_STATUS_IS_OK(status
)) {
248 DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status
)));
253 talloc_reparent(frame
, gensec_ctx
, msg_ctx
);
254 talloc_reparent(frame
, gensec_ctx
, event_ctx
);
255 talloc_reparent(frame
, gensec_ctx
, lp_ctx
);
256 talloc_reparent(frame
, gensec_ctx
, server_credentials
);
258 gensec_want_feature(gensec_ctx
, GENSEC_FEATURE_SESSION_KEY
);
259 gensec_want_feature(gensec_ctx
, GENSEC_FEATURE_UNIX_TOKEN
);
261 *gensec_context
= gensec_ctx
;
267 * Hook to allow handling of NTLM authentication for AD operation
268 * without directly linking the s4 auth stack
270 * This ensures we use the source4 authentication stack, as well as
271 * the authorization stack to create the user's token. This ensures
272 * consistency between NTLM logins and NTLMSSP logins, as NTLMSSP is
273 * handled by the hook above.
275 static NTSTATUS
make_auth4_context_s4(const struct auth_context
*auth_context
,
277 struct auth4_context
**auth4_context
)
280 struct loadparm_context
*lp_ctx
;
281 struct tevent_context
*event_ctx
;
282 TALLOC_CTX
*frame
= talloc_stackframe();
283 struct imessaging_context
*msg_ctx
;
284 struct server_id
*server_id
;
286 lp_ctx
= loadparm_init_s3(frame
, loadparm_s3_helpers());
287 if (lp_ctx
== NULL
) {
288 DEBUG(1, ("loadparm_init_s3 failed\n"));
290 return NT_STATUS_INVALID_SERVER_STATE
;
292 event_ctx
= s4_event_context_init(frame
);
293 if (event_ctx
== NULL
) {
294 DEBUG(1, ("s4_event_context_init failed\n"));
296 return NT_STATUS_INVALID_SERVER_STATE
;
299 server_id
= new_server_id_task(frame
);
300 if (server_id
== NULL
) {
301 DEBUG(1, ("new_server_id_task failed\n"));
303 return NT_STATUS_INVALID_SERVER_STATE
;
306 msg_ctx
= imessaging_init(frame
,
310 if (msg_ctx
== NULL
) {
311 DEBUG(1, ("imessaging_init failed\n"));
313 return NT_STATUS_INVALID_SERVER_STATE
;
315 talloc_reparent(frame
, msg_ctx
, server_id
);
317 /* Allow forcing a specific auth4 module */
318 if (!auth_context
->forced_samba4_methods
) {
319 status
= auth_context_create(mem_ctx
,
325 const char * const *forced_auth_methods
= (const char * const *)str_list_make(mem_ctx
, auth_context
->forced_samba4_methods
, NULL
);
326 status
= auth_context_create_methods(mem_ctx
, forced_auth_methods
, event_ctx
, msg_ctx
, lp_ctx
, NULL
, auth4_context
);
328 if (!NT_STATUS_IS_OK(status
)) {
329 DEBUG(1, ("Failed to start auth server code: %s\n", nt_errstr(status
)));
334 talloc_reparent(frame
, *auth4_context
, msg_ctx
);
335 talloc_reparent(frame
, *auth4_context
, event_ctx
);
336 talloc_reparent(frame
, *auth4_context
, lp_ctx
);
342 /* module initialisation */
343 static NTSTATUS
auth_init_samba4(struct auth_context
*auth_context
,
345 auth_methods
**auth_method
)
347 struct auth_methods
*result
;
351 result
= talloc_zero(auth_context
, struct auth_methods
);
352 if (result
== NULL
) {
353 return NT_STATUS_NO_MEMORY
;
355 result
->name
= "samba4";
356 result
->auth
= check_samba4_security
;
357 result
->prepare_gensec
= prepare_gensec
;
358 result
->make_auth4_context
= make_auth4_context_s4
;
360 if (param
&& *param
) {
361 auth_context
->forced_samba4_methods
= talloc_strdup(result
, param
);
362 if (!auth_context
->forced_samba4_methods
) {
363 return NT_STATUS_NO_MEMORY
;
367 *auth_method
= result
;
371 NTSTATUS
auth_samba4_init(void);
372 NTSTATUS
auth_samba4_init(void)
374 smb_register_auth(AUTH_INTERFACE_VERSION
, "samba4",