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 "source3/include/messages.h"
24 #include "source4/auth/auth.h"
25 #include "auth/auth_sam_reply.h"
26 #include "param/param.h"
27 #include "source4/lib/events/events.h"
28 #include "source4/lib/messaging/messaging.h"
29 #include "auth/gensec/gensec.h"
30 #include "auth/credentials/credentials.h"
31 #include "lib/global_contexts.h"
34 #define DBGC_CLASS DBGC_AUTH
36 static NTSTATUS
make_auth4_context_s4(const struct auth_context
*auth_context
,
38 struct auth4_context
**auth4_context
);
40 static struct idr_context
*task_id_tree
;
42 static int free_task_id(struct server_id
*server_id
)
44 idr_remove(task_id_tree
, server_id
->task_id
);
48 /* Return a server_id with a unique task_id element. Free the
49 * returned pointer to de-allocate the task_id via a talloc destructor
50 * (ie, use talloc_free()) */
51 static struct server_id
*new_server_id_task(TALLOC_CTX
*mem_ctx
)
53 struct messaging_context
*msg_ctx
;
54 struct server_id
*server_id
;
57 task_id_tree
= idr_init(NULL
);
63 msg_ctx
= global_messaging_context();
64 if (msg_ctx
== NULL
) {
68 server_id
= talloc(mem_ctx
, struct server_id
);
73 *server_id
= messaging_server_id(msg_ctx
);
75 /* 0 is the default server_id, so we need to start with 1 */
76 task_id
= idr_get_new_above(task_id_tree
, server_id
, 1, INT32_MAX
);
79 talloc_free(server_id
);
83 talloc_set_destructor(server_id
, free_task_id
);
84 server_id
->task_id
= task_id
;
89 * This module is not an ordinary authentication module. It is really
90 * a way to redirect the whole authentication and authorization stack
91 * to use the source4 auth code, not a way to just handle NTLM
94 * See the comments above each function for how that hook changes the
99 * This hook is currently used by winbindd only, as all other NTLM
100 * logins go via the hooks provided by make_auth4_context_s4() below.
102 * This is only left in case we find a way that it might become useful
103 * in future. Importantly, this routine returns the information
104 * needed for a NETLOGON SamLogon, not what is needed to establish a
107 * We expect we may use this hook in the source3/ winbind when this
108 * services the AD DC. It is tested via pdbtest.
111 static NTSTATUS
check_samba4_security(
112 const struct auth_context
*auth_context
,
113 void *my_private_data
,
115 const struct auth_usersupplied_info
*user_info
,
116 struct auth_serversupplied_info
**pserver_info
)
118 TALLOC_CTX
*frame
= talloc_stackframe();
119 struct netr_SamInfo3
*info3
= NULL
;
121 struct auth_user_info_dc
*user_info_dc
;
122 struct auth4_context
*auth4_context
;
123 uint8_t authoritative
= 1;
124 struct auth_serversupplied_info
*server_info
= NULL
;
126 nt_status
= make_auth4_context_s4(auth_context
, mem_ctx
, &auth4_context
);
127 if (!NT_STATUS_IS_OK(nt_status
)) {
132 nt_status
= auth_context_set_challenge(auth4_context
, auth_context
->challenge
.data
, "auth_samba4");
133 if (!NT_STATUS_IS_OK(nt_status
)) {
134 TALLOC_FREE(auth4_context
);
139 nt_status
= auth_check_password(auth4_context
, auth4_context
, user_info
,
140 &user_info_dc
, &authoritative
);
141 if (!NT_STATUS_IS_OK(nt_status
)) {
142 if (NT_STATUS_EQUAL(nt_status
, NT_STATUS_NO_SUCH_USER
) &&
145 nt_status
= NT_STATUS_NOT_IMPLEMENTED
;
147 TALLOC_FREE(auth4_context
);
152 nt_status
= auth_convert_user_info_dc_saminfo3(mem_ctx
,
155 if (NT_STATUS_IS_OK(nt_status
)) {
156 /* We need the strings from the server_info to be valid as long as the info3 is around */
157 talloc_steal(info3
, user_info_dc
);
159 talloc_free(auth4_context
);
161 if (!NT_STATUS_IS_OK(nt_status
)) {
165 if (user_info
->flags
& USER_INFO_INFO3_AND_NO_AUTHZ
) {
166 server_info
= make_server_info(mem_ctx
);
167 if (server_info
== NULL
) {
168 nt_status
= NT_STATUS_NO_MEMORY
;
171 server_info
->info3
= talloc_move(server_info
, &info3
);
173 nt_status
= make_server_info_info3(
175 user_info
->client
.account_name
,
176 user_info
->mapped
.domain_name
,
179 if (!NT_STATUS_IS_OK(nt_status
)) {
180 DEBUG(10, ("make_server_info_info3 failed: %s\n",
181 nt_errstr(nt_status
)));
186 *pserver_info
= server_info
;
187 nt_status
= NT_STATUS_OK
;
195 * Hook to allow the source4 set of GENSEC modules to handle
196 * blob-based authentication mechanisms, without directly linking the
199 * This may eventually go away, when the GSSAPI acceptors are merged,
200 * when we will just rely on the make_auth4_context_s4 hook instead.
202 * Even for NTLMSSP, which has a common module, significant parts of
203 * the behaviour are overridden here, because it uses the source4 NTLM
204 * stack and the source4 mapping between the PAC/SamLogon response and
207 * It is important to override all this to ensure that the exact same
208 * token is generated and used in the SMB and LDAP servers, for NTLM
211 static NTSTATUS
prepare_gensec(const struct auth_context
*auth_context
,
213 struct gensec_security
**gensec_context
)
216 struct loadparm_context
*lp_ctx
;
217 struct tevent_context
*event_ctx
;
218 TALLOC_CTX
*frame
= talloc_stackframe();
219 struct gensec_security
*gensec_ctx
;
220 struct imessaging_context
*msg_ctx
;
221 struct cli_credentials
*server_credentials
;
222 struct server_id
*server_id
;
224 lp_ctx
= loadparm_init_s3(frame
, loadparm_s3_helpers());
225 if (lp_ctx
== NULL
) {
226 DEBUG(1, ("loadparm_init_s3 failed\n"));
228 return NT_STATUS_INVALID_SERVER_STATE
;
230 event_ctx
= s4_event_context_init(frame
);
231 if (event_ctx
== NULL
) {
232 DEBUG(1, ("s4_event_context_init failed\n"));
234 return NT_STATUS_INVALID_SERVER_STATE
;
237 server_id
= new_server_id_task(frame
);
238 if (server_id
== NULL
) {
239 DEBUG(1, ("new_server_id_task failed\n"));
241 return NT_STATUS_INVALID_SERVER_STATE
;
244 msg_ctx
= imessaging_init(frame
,
248 if (msg_ctx
== NULL
) {
249 DEBUG(1, ("imessaging_init failed\n"));
251 return NT_STATUS_INVALID_SERVER_STATE
;
254 talloc_reparent(frame
, msg_ctx
, server_id
);
257 = cli_credentials_init_server(frame
, lp_ctx
);
258 if (!server_credentials
) {
259 DEBUG(1, ("Failed to init server credentials"));
261 return NT_STATUS_INVALID_SERVER_STATE
;
264 status
= samba_server_gensec_start(mem_ctx
,
266 lp_ctx
, server_credentials
, "cifs",
268 if (!NT_STATUS_IS_OK(status
)) {
269 DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status
)));
274 talloc_reparent(frame
, gensec_ctx
, msg_ctx
);
275 talloc_reparent(frame
, gensec_ctx
, event_ctx
);
276 talloc_reparent(frame
, gensec_ctx
, lp_ctx
);
277 talloc_reparent(frame
, gensec_ctx
, server_credentials
);
279 gensec_want_feature(gensec_ctx
, GENSEC_FEATURE_SESSION_KEY
);
280 gensec_want_feature(gensec_ctx
, GENSEC_FEATURE_UNIX_TOKEN
);
282 *gensec_context
= gensec_ctx
;
288 * Hook to allow handling of NTLM authentication for AD operation
289 * without directly linking the s4 auth stack
291 * This ensures we use the source4 authentication stack, as well as
292 * the authorization stack to create the user's token. This ensures
293 * consistency between NTLM logins and NTLMSSP logins, as NTLMSSP is
294 * handled by the hook above.
296 static NTSTATUS
make_auth4_context_s4(const struct auth_context
*auth_context
,
298 struct auth4_context
**auth4_context
)
301 struct loadparm_context
*lp_ctx
;
302 struct tevent_context
*event_ctx
;
303 TALLOC_CTX
*frame
= talloc_stackframe();
304 struct imessaging_context
*msg_ctx
;
305 struct server_id
*server_id
;
307 lp_ctx
= loadparm_init_s3(frame
, loadparm_s3_helpers());
308 if (lp_ctx
== NULL
) {
309 DEBUG(1, ("loadparm_init_s3 failed\n"));
311 return NT_STATUS_INVALID_SERVER_STATE
;
313 event_ctx
= s4_event_context_init(frame
);
314 if (event_ctx
== NULL
) {
315 DEBUG(1, ("s4_event_context_init failed\n"));
317 return NT_STATUS_INVALID_SERVER_STATE
;
320 server_id
= new_server_id_task(frame
);
321 if (server_id
== NULL
) {
322 DEBUG(1, ("new_server_id_task failed\n"));
324 return NT_STATUS_INVALID_SERVER_STATE
;
327 msg_ctx
= imessaging_init(frame
,
331 if (msg_ctx
== NULL
) {
332 DEBUG(1, ("imessaging_init failed\n"));
334 return NT_STATUS_INVALID_SERVER_STATE
;
336 talloc_reparent(frame
, msg_ctx
, server_id
);
338 /* Allow forcing a specific auth4 module */
339 if (!auth_context
->forced_samba4_methods
) {
340 status
= auth_context_create(mem_ctx
,
346 const char * const *forced_auth_methods
= (const char * const *)str_list_make(mem_ctx
, auth_context
->forced_samba4_methods
, NULL
);
347 status
= auth_context_create_methods(mem_ctx
, forced_auth_methods
, event_ctx
, msg_ctx
, lp_ctx
, NULL
, auth4_context
);
349 if (!NT_STATUS_IS_OK(status
)) {
350 DEBUG(1, ("Failed to start auth server code: %s\n", nt_errstr(status
)));
355 talloc_reparent(frame
, *auth4_context
, msg_ctx
);
356 talloc_reparent(frame
, *auth4_context
, event_ctx
);
357 talloc_reparent(frame
, *auth4_context
, lp_ctx
);
363 /* module initialisation */
364 static NTSTATUS
auth_init_samba4(struct auth_context
*auth_context
,
366 struct auth_methods
**auth_method
)
368 struct auth_methods
*result
;
372 result
= talloc_zero(auth_context
, struct auth_methods
);
373 if (result
== NULL
) {
374 return NT_STATUS_NO_MEMORY
;
376 result
->name
= "samba4";
377 result
->auth
= check_samba4_security
;
378 result
->prepare_gensec
= prepare_gensec
;
379 result
->make_auth4_context
= make_auth4_context_s4
;
381 if (param
&& *param
) {
382 auth_context
->forced_samba4_methods
= talloc_strdup(result
, param
);
383 if (!auth_context
->forced_samba4_methods
) {
384 return NT_STATUS_NO_MEMORY
;
388 *auth_method
= result
;
392 NTSTATUS
auth_samba4_init(TALLOC_CTX
*mem_ctx
);
393 NTSTATUS
auth_samba4_init(TALLOC_CTX
*mem_ctx
)
395 smb_register_auth(AUTH_INTERFACE_VERSION
, "samba4",