summaryrefslogtreecommitdiff
path: root/source4/smb_server/smb/sesssetup.c
blob: 225f0f7c479a53bf89cd9b946d2f2da1abd00a27 (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
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383

/* 
   Unix SMB/CIFS implementation.
   handle SMBsessionsetup
   Copyright (C) Andrew Tridgell                      1998-2001
   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005
   Copyright (C) Jim McDonough                        2002
   Copyright (C) Luke Howard                          2003
   Copyright (C) Stefan Metzmacher                    2005
   
   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 2 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, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"
#include "version.h"
#include "auth/auth.h"
#include "smb_server/smb_server.h"
#include "smbd/service_stream.h"

/*
  setup the OS, Lanman and domain portions of a session setup reply
*/
static void sesssetup_common_strings(struct smbsrv_request *req,
				     char **os, char **lanman, char **domain)
{
	(*os) = talloc_asprintf(req, "Unix");
	(*lanman) = talloc_asprintf(req, "Samba %s", SAMBA_VERSION_STRING);
	(*domain) = talloc_asprintf(req, "%s", lp_workgroup());
}


/*
  handler for old style session setup
*/
static NTSTATUS sesssetup_old(struct smbsrv_request *req, union smb_sesssetup *sess)
{
	NTSTATUS status;
	struct auth_usersupplied_info *user_info = NULL;
	struct auth_serversupplied_info *server_info = NULL;
	struct auth_session_info *session_info;
	struct smbsrv_session *smb_sess;
	struct socket_address *remote_address;
	const char *remote_machine = NULL;

	sess->old.out.vuid = 0;
	sess->old.out.action = 0;

	if (!req->smb_conn->negotiate.done_sesssetup) {
		req->smb_conn->negotiate.max_send = sess->old.in.bufsize;
	}
	
	if (req->smb_conn->negotiate.calling_name) {
		remote_machine = req->smb_conn->negotiate.calling_name->name;
	}
	
	remote_address = socket_get_peer_addr(req->smb_conn->connection->socket, req);
	NT_STATUS_HAVE_NO_MEMORY(remote_address);

	if (!remote_machine) {
		remote_machine = remote_address->addr;
	}

	user_info = talloc(req, struct auth_usersupplied_info);
	NT_STATUS_HAVE_NO_MEMORY(user_info);
	
	user_info->mapped_state = False;
	user_info->logon_parameters = 0;
	user_info->flags = 0;
	user_info->client.account_name = sess->old.in.user;
	user_info->client.domain_name = sess->old.in.domain;
	user_info->workstation_name = remote_machine;
	user_info->remote_host = talloc_steal(user_info, remote_address);
	
	user_info->password_state = AUTH_PASSWORD_RESPONSE;
	user_info->password.response.lanman = sess->old.in.password;
	user_info->password.response.lanman.data = talloc_steal(user_info, sess->old.in.password.data);
	user_info->password.response.nt = data_blob(NULL, 0);

	status = auth_check_password(req->smb_conn->negotiate.auth_context,
				     req, user_info, &server_info);
	if (!NT_STATUS_IS_OK(status)) {
		return auth_nt_status_squash(status);
	}

	/* This references server_info into session_info */
	status = auth_generate_session_info(req, server_info, &session_info);
	if (!NT_STATUS_IS_OK(status)) {
		return auth_nt_status_squash(status);
	}

	/* allocate a new session */
	smb_sess = smbsrv_session_new(req->smb_conn, NULL);
	if (!smb_sess) {
		return NT_STATUS_ACCESS_DENIED;
	}

	/* Ensure this is marked as a 'real' vuid, not one
	 * simply valid for the session setup leg */
	status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
	if (!NT_STATUS_IS_OK(status)) {
		return auth_nt_status_squash(status);
	}

	/* To correctly process any AndX packet (like a tree connect)
	 * we need to fill in the session on the request here */
	req->session = smb_sess;
	sess->old.out.vuid = smb_sess->vuid;

	sesssetup_common_strings(req, 
				 &sess->old.out.os,
				 &sess->old.out.lanman,
				 &sess->old.out.domain);

	return NT_STATUS_OK;
}


/*
  handler for NT1 style session setup
*/
static NTSTATUS sesssetup_nt1(struct smbsrv_request *req, union smb_sesssetup *sess)
{
	NTSTATUS status;
	struct auth_context *auth_context;
	struct auth_usersupplied_info *user_info = NULL;
	struct auth_serversupplied_info *server_info = NULL;
	struct auth_session_info *session_info;
	struct smbsrv_session *smb_sess;
	struct socket_address *remote_address;
	const char *remote_machine = NULL;
	
	sess->nt1.out.vuid = 0;
	sess->nt1.out.action = 0;

	if (!req->smb_conn->negotiate.done_sesssetup) {
		req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
		req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
	}

	if (req->smb_conn->negotiate.spnego_negotiated) {
		if (sess->nt1.in.user && *sess->nt1.in.user) {
			/* We can't accept a normal login, because we
			 * don't have a challenge */
			return NT_STATUS_LOGON_FAILURE;
		}

		/* TODO: should we use just "anonymous" here? */
		status = auth_context_create(req, lp_auth_methods(), 
					     &auth_context, 
					     req->smb_conn->connection->event.ctx);
		NT_STATUS_NOT_OK_RETURN(status);
	} else {
		auth_context = req->smb_conn->negotiate.auth_context;
	}

	if (req->smb_conn->negotiate.calling_name) {
		remote_machine = req->smb_conn->negotiate.calling_name->name;
	}

	remote_address = socket_get_peer_addr(req->smb_conn->connection->socket, req);
	NT_STATUS_HAVE_NO_MEMORY(remote_address);

	if (!remote_machine) {
		remote_machine = remote_address->addr;
	}

	user_info = talloc(req, struct auth_usersupplied_info);
	NT_STATUS_HAVE_NO_MEMORY(user_info);
	
	user_info->mapped_state = False;
	user_info->logon_parameters = 0;
	user_info->flags = 0;
	user_info->client.account_name = sess->nt1.in.user;
	user_info->client.domain_name = sess->nt1.in.domain;
	user_info->workstation_name = remote_machine;
	user_info->remote_host = talloc_steal(user_info, remote_address);
	
	user_info->password_state = AUTH_PASSWORD_RESPONSE;
	user_info->password.response.lanman = sess->nt1.in.password1;
	user_info->password.response.lanman.data = talloc_steal(user_info, sess->nt1.in.password1.data);
	user_info->password.response.nt = sess->nt1.in.password2;
	user_info->password.response.nt.data = talloc_steal(user_info, sess->nt1.in.password2.data);

	status = auth_check_password(auth_context, req, user_info, &server_info);
	if (!NT_STATUS_IS_OK(status)) {
		return auth_nt_status_squash(status);
	}

	/* This references server_info into session_info */
	status = auth_generate_session_info(req, server_info, &session_info);
	if (!NT_STATUS_IS_OK(status)) {
		return auth_nt_status_squash(status);
	}

	/* allocate a new session */
	smb_sess = smbsrv_session_new(req->smb_conn, NULL);
	if (!smb_sess) {
		return NT_STATUS_ACCESS_DENIED;
	}

	/* Ensure this is marked as a 'real' vuid, not one
	 * simply valid for the session setup leg */
	status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
	if (!NT_STATUS_IS_OK(status)) {
		return auth_nt_status_squash(status);
	}

	/* To correctly process any AndX packet (like a tree connect)
	 * we need to fill in the session on the request here */
	req->session = smb_sess;
	sess->nt1.out.vuid = smb_sess->vuid;

	sesssetup_common_strings(req, 
				 &sess->nt1.out.os,
				 &sess->nt1.out.lanman,
				 &sess->nt1.out.domain);

	if (!session_info->server_info->authenticated) {
		return NT_STATUS_OK;
	}

 	if (!srv_setup_signing(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2)) {
		/* Already signing, or disabled */
		return NT_STATUS_OK;
	}

	/* Force check of the request packet, now we know the session key */
	req_signing_check_incoming(req);
/* TODO: why don't we check the result here? */

	/* Unfortunetly win2k3 as a client doesn't sign the request
	 * packet here, so we have to force signing to start again */

	srv_signing_restart(req->smb_conn,  &session_info->session_key, &sess->nt1.in.password2);

	return NT_STATUS_OK;
}


/*
  handler for SPNEGO style session setup
*/
static NTSTATUS sesssetup_spnego(struct smbsrv_request *req, union smb_sesssetup *sess)
{
	NTSTATUS status;
	NTSTATUS skey_status;
	struct smbsrv_session *smb_sess = NULL;
	struct auth_session_info *session_info = NULL;
	DATA_BLOB session_key;
	uint16_t vuid;

	sess->spnego.out.vuid = 0;
	sess->spnego.out.action = 0;

	sesssetup_common_strings(req, 
				 &sess->spnego.out.os,
				 &sess->spnego.out.lanman,
				 &sess->spnego.out.workgroup);

	if (!req->smb_conn->negotiate.done_sesssetup) {
		req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
		req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
	}

	vuid = SVAL(req->in.hdr,HDR_UID);

	/* lookup an existing session */
	smb_sess = smbsrv_session_find_sesssetup(req->smb_conn, vuid);
	if (!smb_sess) {
		struct gensec_security *gensec_ctx;

		status = gensec_server_start(req, &gensec_ctx,
					     req->smb_conn->connection->event.ctx);
		if (!NT_STATUS_IS_OK(status)) {
			DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
			return status;
		}

		gensec_set_credentials(gensec_ctx, req->smb_conn->negotiate.server_credentials);

		gensec_set_target_service(gensec_ctx, "cifs");

		gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);

		status = gensec_start_mech_by_oid(gensec_ctx, GENSEC_OID_SPNEGO);
		if (!NT_STATUS_IS_OK(status)) {
			DEBUG(1, ("Failed to start GENSEC SPNEGO server code: %s\n", nt_errstr(status)));
			return status;
		}

		/* allocate a new session */
		smb_sess = smbsrv_session_new(req->smb_conn, gensec_ctx);
	}

	if (!smb_sess) {
		return NT_STATUS_ACCESS_DENIED;
	}

	if (!smb_sess->gensec_ctx) {
		status = NT_STATUS_INTERNAL_ERROR;
		DEBUG(1, ("Internal ERROR: no gensec_ctx on session: %s\n", nt_errstr(status)));
		goto failed;
	}

	status = gensec_update(smb_sess->gensec_ctx, req, sess->spnego.in.secblob, &sess->spnego.out.secblob);
	if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
		sess->spnego.out.vuid = smb_sess->vuid;
		return status;
	} else if (!NT_STATUS_IS_OK(status)) {
		goto failed;
	}

	status = gensec_session_info(smb_sess->gensec_ctx, &session_info);
	if (!NT_STATUS_IS_OK(status)) {
		goto failed;
	}

	skey_status = gensec_session_key(smb_sess->gensec_ctx, &session_key);
	if (NT_STATUS_IS_OK(skey_status) &&
	    session_info->server_info->authenticated &&
	    srv_setup_signing(req->smb_conn, &session_key, NULL)) {
		/* Force check of the request packet, now we know the session key */
		req_signing_check_incoming(req);

		srv_signing_restart(req->smb_conn, &session_key, NULL);
	}

	/* Ensure this is marked as a 'real' vuid, not one
	 * simply valid for the session setup leg */
	status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
	if (!NT_STATUS_IS_OK(status)) {
		goto failed;
	}
	req->session = smb_sess;

	sess->spnego.out.vuid = smb_sess->vuid;
	return NT_STATUS_OK;

failed:
	talloc_free(smb_sess);
	return auth_nt_status_squash(status);
}

/*
  backend for sessionsetup call - this takes all 3 variants of the call
*/
NTSTATUS sesssetup_backend(struct smbsrv_request *req, 
			   union smb_sesssetup *sess)
{
	NTSTATUS status = NT_STATUS_INVALID_LEVEL;

	switch (sess->old.level) {
		case RAW_SESSSETUP_OLD:
			status = sesssetup_old(req, sess);
			break;
		case RAW_SESSSETUP_NT1:
			status = sesssetup_nt1(req, sess);
			break;
		case RAW_SESSSETUP_SPNEGO:
			status = sesssetup_spnego(req, sess);
			break;
	}

	if (NT_STATUS_IS_OK(status)) {
		req->smb_conn->negotiate.done_sesssetup = True;
	}

	return status;
}