summaryrefslogtreecommitdiff
path: root/source4/ldap_server/ldap_bind.c
blob: 9abc6115e673f1e4be090f2bcfc234f9c6802cd2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
/* 
   Unix SMB/CIFS implementation.
   LDAP server
   Copyright (C) Stefan Metzmacher 2004
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "ldap_server/ldap_server.h"
#include "auth/auth.h"
#include "libcli/ldap/ldap.h"
#include "smbd/service.h"
#include "lib/ldb/include/ldb.h"
#include "lib/ldb/include/ldb_errors.h"
#include "dsdb/samdb/samdb.h"
#include "auth/gensec/gensec.h"
#include "param/param.h"

static NTSTATUS ldapsrv_BindSimple(struct ldapsrv_call *call)
{
	struct ldap_BindRequest *req = &call->request->r.BindRequest;
	struct ldapsrv_reply *reply;
	struct ldap_BindResponse *resp;

	int result;
	const char *errstr;
	const char *nt4_domain, *nt4_account;

	struct auth_session_info *session_info;

	NTSTATUS status;

	DEBUG(10, ("BindSimple dn: %s\n",req->dn));

	status = crack_auto_name_to_nt4_name(call, call->conn->connection->event.ctx, call->conn->lp_ctx, req->dn, &nt4_domain, &nt4_account);
	if (NT_STATUS_IS_OK(status)) {
		status = authenticate_username_pw(call,
						  call->conn->connection->event.ctx,
						  call->conn->connection->msg_ctx,
						  call->conn->lp_ctx,
						  nt4_domain, nt4_account, 
						  req->creds.password,
						  &session_info);
	}

	reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
	if (!reply) {
		return NT_STATUS_NO_MEMORY;
	}

	if (NT_STATUS_IS_OK(status)) {
		result = LDAP_SUCCESS;
		errstr = NULL;

		talloc_free(call->conn->session_info);
		call->conn->session_info = session_info;
		talloc_steal(call->conn, session_info);

		/* don't leak the old LDB */
		talloc_free(call->conn->ldb);

		status = ldapsrv_backend_Init(call->conn);		
		
		if (!NT_STATUS_IS_OK(status)) {
			result = LDAP_OPERATIONS_ERROR;
			errstr = talloc_asprintf(reply, "Simple Bind: Failed to advise ldb new credentials: %s", nt_errstr(status));
		}
	} else {
		status = auth_nt_status_squash(status);

		result = LDAP_INVALID_CREDENTIALS;
		errstr = talloc_asprintf(reply, "Simple Bind Failed: %s", nt_errstr(status));
	}

	resp = &reply->msg->r.BindResponse;
	resp->response.resultcode = result;
	resp->response.errormessage = errstr;
	resp->response.dn = NULL;
	resp->response.referral = NULL;
	resp->SASL.secblob = NULL;

	ldapsrv_queue_reply(call, reply);
	return NT_STATUS_OK;
}

struct ldapsrv_sasl_context {
	struct ldapsrv_connection *conn;
	struct socket_context *sasl_socket;
};

static void ldapsrv_set_sasl(void *private_data)
{
	struct ldapsrv_sasl_context *ctx = talloc_get_type(private_data, struct ldapsrv_sasl_context);
	talloc_steal(ctx->conn->connection, ctx->sasl_socket);
	talloc_unlink(ctx->conn->connection, ctx->conn->connection->socket);

	ctx->conn->sockets.sasl = ctx->sasl_socket;
	ctx->conn->connection->socket = ctx->sasl_socket;
	packet_set_socket(ctx->conn->packet, ctx->conn->connection->socket);
}

static NTSTATUS ldapsrv_BindSASL(struct ldapsrv_call *call)
{
	struct ldap_BindRequest *req = &call->request->r.BindRequest;
	struct ldapsrv_reply *reply;
	struct ldap_BindResponse *resp;
	struct ldapsrv_connection *conn;
	int result = 0;
	const char *errstr=NULL;
	NTSTATUS status = NT_STATUS_OK;

	DEBUG(10, ("BindSASL dn: %s\n",req->dn));

	reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
	if (!reply) {
		return NT_STATUS_NO_MEMORY;
	}
	resp = &reply->msg->r.BindResponse;
	
	conn = call->conn;

	/* 
	 * TODO: a SASL bind with a different mechanism
	 *       should cancel an inprogress SASL bind.
	 *       (see RFC 4513)
	 */

	if (!conn->gensec) {
		conn->session_info = NULL;

		status = samba_server_gensec_start(conn,
						   conn->connection->event.ctx,
						   conn->connection->msg_ctx,
						   conn->lp_ctx,
						   conn->server_credentials,
						   "ldap",
						   &conn->gensec);
		if (!NT_STATUS_IS_OK(status)) {
			DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
			result = LDAP_OPERATIONS_ERROR;
			errstr = talloc_asprintf(reply, "SASL: Failed to start authentication system: %s", 
						 nt_errstr(status));
		} else {
		
			gensec_want_feature(conn->gensec, GENSEC_FEATURE_SIGN);
			gensec_want_feature(conn->gensec, GENSEC_FEATURE_SEAL);
			gensec_want_feature(conn->gensec, GENSEC_FEATURE_ASYNC_REPLIES);
			
			status = gensec_start_mech_by_sasl_name(conn->gensec, req->creds.SASL.mechanism);
			
			if (!NT_STATUS_IS_OK(status)) {
				DEBUG(1, ("Failed to start GENSEC SASL[%s] server code: %s\n", 
					  req->creds.SASL.mechanism, nt_errstr(status)));
				result = LDAP_OPERATIONS_ERROR;
				errstr = talloc_asprintf(reply, "SASL:[%s]: Failed to start authentication backend: %s", 
							 req->creds.SASL.mechanism, nt_errstr(status));
			}
		}
	}

	if (NT_STATUS_IS_OK(status)) {
		DATA_BLOB input = data_blob(NULL, 0);
		DATA_BLOB output = data_blob(NULL, 0);

		if (req->creds.SASL.secblob) {
			input = *req->creds.SASL.secblob;
		}

		status = gensec_update(conn->gensec, reply,
				       input, &output);

		/* Windows 2000 mmc doesn't like secblob == NULL and reports a decoding error */
		resp->SASL.secblob = talloc(reply, DATA_BLOB);
		NT_STATUS_HAVE_NO_MEMORY(resp->SASL.secblob);
		*resp->SASL.secblob = output;
	} else {
		resp->SASL.secblob = NULL;
	}

	if (NT_STATUS_EQUAL(NT_STATUS_MORE_PROCESSING_REQUIRED, status)) {
		result = LDAP_SASL_BIND_IN_PROGRESS;
		errstr = NULL;
	} else if (NT_STATUS_IS_OK(status)) {
		struct auth_session_info *old_session_info=NULL;
		struct ldapsrv_sasl_context *ctx;

		result = LDAP_SUCCESS;
		errstr = NULL;

		ctx = talloc(call, struct ldapsrv_sasl_context); 

		if (!ctx) {
			status = NT_STATUS_NO_MEMORY;
		} else {
			ctx->conn = conn;
			status = gensec_socket_init(conn->gensec, 
						    conn->connection,
						    conn->connection->socket,
						    conn->connection->event.ctx, 
						    stream_io_handler_callback,
						    conn->connection,
						    &ctx->sasl_socket);
		} 

		if (!ctx || !NT_STATUS_IS_OK(status)) {
			conn->session_info = old_session_info;
			result = LDAP_OPERATIONS_ERROR;
			errstr = talloc_asprintf(reply, 
						 "SASL:[%s]: Failed to setup SASL socket: %s", 
						 req->creds.SASL.mechanism, nt_errstr(status));
		} else {

			call->send_callback = ldapsrv_set_sasl;
			call->send_private = ctx;
		
			old_session_info = conn->session_info;
			conn->session_info = NULL;
			status = gensec_session_info(conn->gensec, &conn->session_info);
			if (!NT_STATUS_IS_OK(status)) {
				conn->session_info = old_session_info;
				result = LDAP_OPERATIONS_ERROR;
				errstr = talloc_asprintf(reply, 
							 "SASL:[%s]: Failed to get session info: %s", 
							 req->creds.SASL.mechanism, nt_errstr(status));
			} else {
				talloc_free(old_session_info);
				talloc_steal(conn, conn->session_info);
				
				/* don't leak the old LDB */
				talloc_free(conn->ldb);
				
				status = ldapsrv_backend_Init(conn);		
				
				if (!NT_STATUS_IS_OK(status)) {
					result = LDAP_OPERATIONS_ERROR;
					errstr = talloc_asprintf(reply, 
								 "SASL:[%s]: Failed to advise samdb of new credentials: %s", 
								 req->creds.SASL.mechanism, 
								 nt_errstr(status));
				}
			}
		}
	} else {
		status = auth_nt_status_squash(status);
		if (result == 0) {
			result = LDAP_INVALID_CREDENTIALS;
			errstr = talloc_asprintf(reply, "SASL:[%s]: %s", req->creds.SASL.mechanism, nt_errstr(status));
		}
	}

	resp->response.resultcode = result;
	resp->response.dn = NULL;
	resp->response.errormessage = errstr;
	resp->response.referral = NULL;

	ldapsrv_queue_reply(call, reply);
	return NT_STATUS_OK;
}

NTSTATUS ldapsrv_BindRequest(struct ldapsrv_call *call)
{
	struct ldap_BindRequest *req = &call->request->r.BindRequest;
	struct ldapsrv_reply *reply;
	struct ldap_BindResponse *resp;

	/* 
	 * TODO: we should fail the bind request
	 *       if there're any pending requests.
	 *
	 *       also a simple bind should cancel an
	 *       inprogress SASL bind.
	 *       (see RFC 4513)
	 */
	switch (req->mechanism) {
		case LDAP_AUTH_MECH_SIMPLE:
			return ldapsrv_BindSimple(call);
		case LDAP_AUTH_MECH_SASL:
			return ldapsrv_BindSASL(call);
	}

	reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
	if (!reply) {
		return NT_STATUS_NO_MEMORY;
	}

	resp = &reply->msg->r.BindResponse;
	resp->response.resultcode = 7;
	resp->response.dn = NULL;
	resp->response.errormessage = talloc_asprintf(reply, "Bad AuthenticationChoice [%d]", req->mechanism);
	resp->response.referral = NULL;
	resp->SASL.secblob = NULL;

	ldapsrv_queue_reply(call, reply);
	return NT_STATUS_OK;
}

NTSTATUS ldapsrv_UnbindRequest(struct ldapsrv_call *call)
{
	DEBUG(10, ("UnbindRequest\n"));
	return NT_STATUS_OK;
}