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 struct idr_context *task_id_tree;
36 static int free_task_id(struct server_id *server_id)
38 idr_remove(task_id_tree, server_id->task_id);
42 /* Return a server_id with a unique task_id element. Free the
43 * returned pointer to de-allocate the task_id via a talloc destructor
44 * (ie, use talloc_free()) */
45 static struct server_id *new_server_id_task(TALLOC_CTX *mem_ctx)
47 struct server_id *server_id;
50 task_id_tree = idr_init(NULL);
56 server_id = talloc(mem_ctx, struct server_id);
61 *server_id = procid_self();
63 /* 0 is the default server_id, so we need to start with 1 */
64 task_id = idr_get_new_above(task_id_tree, server_id, 1, INT32_MAX);
67 talloc_free(server_id);
71 talloc_set_destructor(server_id, free_task_id);
72 server_id->task_id = task_id;
77 * This module is not an ordinary authentication module. It is really
78 * a way to redirect the whole authentication and authorization stack
79 * to use the source4 auth code, not a way to just handle NTLM
82 * See the comments above each function for how that hook changes the
87 * This hook is currently unused, as all NTLM logins go via the hooks
88 * provided by make_auth4_context_s4() below.
90 * This is only left in case we find a way that it might become useful
91 * in future. Importantly, this routine returns the information
92 * needed for a NETLOGON SamLogon, not what is needed to establish a
95 * We expect we may use this hook in the source3/ winbind when this
96 * services the AD DC. It is tested via pdbtest.
99 static NTSTATUS check_samba4_security(const struct auth_context *auth_context,
100 void *my_private_data,
102 const struct auth_usersupplied_info *user_info,
103 struct auth_serversupplied_info **server_info)
105 TALLOC_CTX *frame = talloc_stackframe();
106 struct netr_SamInfo3 *info3 = NULL;
108 struct auth_user_info_dc *user_info_dc;
109 struct auth4_context *auth4_context;
110 struct loadparm_context *lp_ctx;
112 lp_ctx = loadparm_init_s3(frame, loadparm_s3_helpers());
113 if (lp_ctx == NULL) {
114 DEBUG(10, ("loadparm_init_s3 failed\n"));
116 return NT_STATUS_INVALID_SERVER_STATE;
119 /* We create a private tevent context here to avoid nested loops in
120 * the s3 one, as that may not be expected */
121 nt_status = auth_context_create(mem_ctx,
122 s4_event_context_init(frame), NULL,
125 NT_STATUS_NOT_OK_RETURN(nt_status);
127 nt_status = auth_context_set_challenge(auth4_context, auth_context->challenge.data, "auth_samba4");
128 if (!NT_STATUS_IS_OK(nt_status)) {
129 TALLOC_FREE(auth4_context);
133 nt_status = auth_check_password(auth4_context, auth4_context, user_info, &user_info_dc);
134 if (!NT_STATUS_IS_OK(nt_status)) {
135 TALLOC_FREE(auth4_context);
139 nt_status = auth_convert_user_info_dc_saminfo3(mem_ctx,
142 if (NT_STATUS_IS_OK(nt_status)) {
143 /* We need the strings from the server_info to be valid as long as the info3 is around */
144 talloc_steal(info3, user_info_dc);
146 talloc_free(auth4_context);
148 if (!NT_STATUS_IS_OK(nt_status)) {
152 nt_status = make_server_info_info3(mem_ctx, user_info->client.account_name,
153 user_info->mapped.domain_name, server_info,
155 if (!NT_STATUS_IS_OK(nt_status)) {
156 DEBUG(10, ("make_server_info_info3 failed: %s\n",
157 nt_errstr(nt_status)));
162 nt_status = NT_STATUS_OK;
170 * Hook to allow the source4 set of GENSEC modules to handle
171 * blob-based authentication mechanisms, without directly linking the
174 * This may eventually go away, when the GSSAPI acceptors are merged,
175 * when we will just rely on the make_auth4_context_s4 hook instead.
177 * Even for NTLMSSP, which has a common module, significant parts of
178 * the behaviour are overridden here, because it uses the source4 NTLM
179 * stack and the source4 mapping between the PAC/SamLogon response and
182 * It is important to override all this to ensure that the exact same
183 * token is generated and used in the SMB and LDAP servers, for NTLM
186 static NTSTATUS prepare_gensec(TALLOC_CTX *mem_ctx,
187 struct gensec_security **gensec_context)
190 struct loadparm_context *lp_ctx;
191 struct tevent_context *event_ctx;
192 TALLOC_CTX *frame = talloc_stackframe();
193 struct gensec_security *gensec_ctx;
194 struct imessaging_context *msg_ctx;
195 struct cli_credentials *server_credentials;
196 struct server_id *server_id;
198 lp_ctx = loadparm_init_s3(frame, loadparm_s3_helpers());
199 if (lp_ctx == NULL) {
200 DEBUG(1, ("loadparm_init_s3 failed\n"));
202 return NT_STATUS_INVALID_SERVER_STATE;
204 event_ctx = s4_event_context_init(frame);
205 if (event_ctx == NULL) {
206 DEBUG(1, ("s4_event_context_init failed\n"));
208 return NT_STATUS_INVALID_SERVER_STATE;
211 server_id = new_server_id_task(frame);
212 if (server_id == NULL) {
213 DEBUG(1, ("new_server_id_task failed\n"));
215 return NT_STATUS_INVALID_SERVER_STATE;
218 msg_ctx = imessaging_init(frame,
222 if (msg_ctx == NULL) {
223 DEBUG(1, ("imessaging_init failed\n"));
225 return NT_STATUS_INVALID_SERVER_STATE;
228 talloc_reparent(frame, msg_ctx, server_id);
231 = cli_credentials_init(frame);
232 if (!server_credentials) {
233 DEBUG(1, ("Failed to init server credentials"));
235 return NT_STATUS_INVALID_SERVER_STATE;
238 cli_credentials_set_conf(server_credentials, lp_ctx);
239 status = cli_credentials_set_machine_account(server_credentials, lp_ctx);
240 if (!NT_STATUS_IS_OK(status)) {
241 DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(status)));
242 talloc_free(server_credentials);
243 server_credentials = NULL;
246 status = samba_server_gensec_start(mem_ctx,
248 lp_ctx, server_credentials, "cifs",
250 if (!NT_STATUS_IS_OK(status)) {
251 DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
256 talloc_reparent(frame, gensec_ctx, msg_ctx);
257 talloc_reparent(frame, gensec_ctx, event_ctx);
258 talloc_reparent(frame, gensec_ctx, lp_ctx);
259 talloc_reparent(frame, gensec_ctx, server_credentials);
261 gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
262 gensec_want_feature(gensec_ctx, GENSEC_FEATURE_UNIX_TOKEN);
264 *gensec_context = gensec_ctx;
270 * Hook to allow handling of NTLM authentication for AD operation
271 * without directly linking the s4 auth stack
273 * This ensures we use the source4 authentication stack, as well as
274 * the authorization stack to create the user's token. This ensures
275 * consistency between NTLM logins and NTLMSSP logins, as NTLMSSP is
276 * handled by the hook above.
278 static NTSTATUS make_auth4_context_s4(TALLOC_CTX *mem_ctx,
279 struct auth4_context **auth4_context)
282 struct loadparm_context *lp_ctx;
283 struct tevent_context *event_ctx;
284 TALLOC_CTX *frame = talloc_stackframe();
285 struct imessaging_context *msg_ctx;
286 struct server_id *server_id;
288 lp_ctx = loadparm_init_s3(frame, loadparm_s3_helpers());
289 if (lp_ctx == NULL) {
290 DEBUG(1, ("loadparm_init_s3 failed\n"));
292 return NT_STATUS_INVALID_SERVER_STATE;
294 event_ctx = s4_event_context_init(frame);
295 if (event_ctx == NULL) {
296 DEBUG(1, ("s4_event_context_init failed\n"));
298 return NT_STATUS_INVALID_SERVER_STATE;
301 server_id = new_server_id_task(frame);
302 if (server_id == NULL) {
303 DEBUG(1, ("new_server_id_task failed\n"));
305 return NT_STATUS_INVALID_SERVER_STATE;
308 msg_ctx = imessaging_init(frame,
312 if (msg_ctx == NULL) {
313 DEBUG(1, ("imessaging_init failed\n"));
315 return NT_STATUS_INVALID_SERVER_STATE;
317 talloc_reparent(frame, msg_ctx, server_id);
319 status = auth_context_create(mem_ctx,
325 if (!NT_STATUS_IS_OK(status)) {
326 DEBUG(1, ("Failed to start auth server code: %s\n", nt_errstr(status)));
331 talloc_reparent(frame, *auth4_context, msg_ctx);
332 talloc_reparent(frame, *auth4_context, event_ctx);
333 talloc_reparent(frame, *auth4_context, lp_ctx);
339 /* module initialisation */
340 static NTSTATUS auth_init_samba4(struct auth_context *auth_context,
342 auth_methods **auth_method)
344 struct auth_methods *result;
348 result = talloc_zero(auth_context, struct auth_methods);
349 if (result == NULL) {
350 return NT_STATUS_NO_MEMORY;
352 result->name = "samba4";
353 result->auth = check_samba4_security;
354 result->prepare_gensec = prepare_gensec;
355 result->make_auth4_context = make_auth4_context_s4;
357 *auth_method = result;
361 NTSTATUS auth_samba4_init(void)
363 smb_register_auth(AUTH_INTERFACE_VERSION, "samba4",