source: vendor/3.5.8/source3/smbd/smb2_sesssetup.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 16 years ago

Samba 3.5.0: Initial import
File size: 11.7 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 Core SMB2 server
4
5 Copyright (C) Stefan Metzmacher 2009
6
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.
11
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.
16
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/>.
19*/
20
21#include "includes.h"
22#include "smbd/globals.h"
23#include "../libcli/smb/smb_common.h"
24#include "../libcli/auth/spnego.h"
25
26static NTSTATUS smbd_smb2_session_setup(struct smbd_smb2_request *req,
27 uint64_t in_session_id,
28 uint8_t in_security_mode,
29 DATA_BLOB in_security_buffer,
30 uint16_t *out_session_flags,
31 DATA_BLOB *out_security_buffer,
32 uint64_t *out_session_id);
33
34NTSTATUS smbd_smb2_request_process_sesssetup(struct smbd_smb2_request *req)
35{
36 const uint8_t *inhdr;
37 const uint8_t *inbody;
38 int i = req->current_idx;
39 uint8_t *outhdr;
40 DATA_BLOB outbody;
41 DATA_BLOB outdyn;
42 size_t expected_body_size = 0x19;
43 size_t body_size;
44 uint64_t in_session_id;
45 uint8_t in_security_mode;
46 uint16_t in_security_offset;
47 uint16_t in_security_length;
48 DATA_BLOB in_security_buffer;
49 uint16_t out_session_flags;
50 uint64_t out_session_id;
51 uint16_t out_security_offset;
52 DATA_BLOB out_security_buffer;
53 NTSTATUS status;
54
55 inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
56
57 if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
58 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
59 }
60
61 inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
62
63 body_size = SVAL(inbody, 0x00);
64 if (body_size != expected_body_size) {
65 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
66 }
67
68 in_security_offset = SVAL(inbody, 0x0C);
69 in_security_length = SVAL(inbody, 0x0E);
70
71 if (in_security_offset != (SMB2_HDR_BODY + (body_size & 0xFFFFFFFE))) {
72 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
73 }
74
75 if (in_security_length > req->in.vector[i+2].iov_len) {
76 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
77 }
78
79 in_session_id = BVAL(inhdr, SMB2_HDR_SESSION_ID);
80 in_security_mode = CVAL(inbody, 0x03);
81 in_security_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
82 in_security_buffer.length = in_security_length;
83
84 status = smbd_smb2_session_setup(req,
85 in_session_id,
86 in_security_mode,
87 in_security_buffer,
88 &out_session_flags,
89 &out_security_buffer,
90 &out_session_id);
91 if (!NT_STATUS_IS_OK(status) &&
92 !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
93 status = nt_status_squash(status);
94 return smbd_smb2_request_error(req, status);
95 }
96
97 out_security_offset = SMB2_HDR_BODY + 0x08;
98
99 outhdr = (uint8_t *)req->out.vector[i].iov_base;
100
101 outbody = data_blob_talloc(req->out.vector, NULL, 0x08);
102 if (outbody.data == NULL) {
103 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
104 }
105
106 SBVAL(outhdr, SMB2_HDR_SESSION_ID, out_session_id);
107
108 SSVAL(outbody.data, 0x00, 0x08 + 1); /* struct size */
109 SSVAL(outbody.data, 0x02,
110 out_session_flags); /* session flags */
111 SSVAL(outbody.data, 0x04,
112 out_security_offset); /* security buffer offset */
113 SSVAL(outbody.data, 0x06,
114 out_security_buffer.length); /* security buffer length */
115
116 outdyn = out_security_buffer;
117
118 return smbd_smb2_request_done_ex(req, status, outbody, &outdyn,
119 __location__);
120}
121
122static int smbd_smb2_session_destructor(struct smbd_smb2_session *session)
123{
124 if (session->sconn == NULL) {
125 return 0;
126 }
127
128 /* first free all tcons */
129 while (session->tcons.list) {
130 talloc_free(session->tcons.list);
131 }
132
133 idr_remove(session->sconn->smb2.sessions.idtree, session->vuid);
134 DLIST_REMOVE(session->sconn->smb2.sessions.list, session);
135 invalidate_vuid(session->sconn, session->vuid);
136
137 session->vuid = 0;
138 session->status = NT_STATUS_USER_SESSION_DELETED;
139 session->sconn = NULL;
140
141 return 0;
142}
143
144static NTSTATUS smbd_smb2_session_setup(struct smbd_smb2_request *req,
145 uint64_t in_session_id,
146 uint8_t in_security_mode,
147 DATA_BLOB in_security_buffer,
148 uint16_t *out_session_flags,
149 DATA_BLOB *out_security_buffer,
150 uint64_t *out_session_id)
151{
152 struct smbd_smb2_session *session;
153 NTSTATUS status;
154
155 *out_session_flags = 0;
156 *out_session_id = 0;
157
158 if (in_session_id == 0) {
159 int id;
160
161 /* create a new session */
162 session = talloc_zero(req->sconn, struct smbd_smb2_session);
163 if (session == NULL) {
164 return NT_STATUS_NO_MEMORY;
165 }
166 session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
167 id = idr_get_new_random(req->sconn->smb2.sessions.idtree,
168 session,
169 req->sconn->smb2.sessions.limit);
170 if (id == -1) {
171 return NT_STATUS_INSUFFICIENT_RESOURCES;
172 }
173 session->vuid = id;
174
175 session->tcons.idtree = idr_init(session);
176 if (session->tcons.idtree == NULL) {
177 return NT_STATUS_NO_MEMORY;
178 }
179 session->tcons.limit = 0x0000FFFE;
180 session->tcons.list = NULL;
181
182 DLIST_ADD_END(req->sconn->smb2.sessions.list, session,
183 struct smbd_smb2_session *);
184 session->sconn = req->sconn;
185 talloc_set_destructor(session, smbd_smb2_session_destructor);
186 } else {
187 void *p;
188
189 /* lookup an existing session */
190 p = idr_find(req->sconn->smb2.sessions.idtree, in_session_id);
191 if (p == NULL) {
192 return NT_STATUS_USER_SESSION_DELETED;
193 }
194 session = talloc_get_type_abort(p, struct smbd_smb2_session);
195 }
196
197 if (NT_STATUS_IS_OK(session->status)) {
198 return NT_STATUS_REQUEST_NOT_ACCEPTED;
199 }
200
201 if (session->auth_ntlmssp_state == NULL) {
202 status = auth_ntlmssp_start(&session->auth_ntlmssp_state);
203 if (!NT_STATUS_IS_OK(status)) {
204 TALLOC_FREE(session);
205 return status;
206 }
207 }
208
209 if (in_security_buffer.data[0] == ASN1_APPLICATION(0)) {
210 DATA_BLOB secblob_in;
211 DATA_BLOB chal_out;
212 char *kerb_mech = NULL;
213
214 status = parse_spnego_mechanisms(in_security_buffer,
215 &secblob_in, &kerb_mech);
216 if (!NT_STATUS_IS_OK(status)) {
217 TALLOC_FREE(session);
218 return nt_status_squash(status);
219 }
220
221 /* For now, just SPNEGO NTLMSSP - krb5 goes here later.. */
222 status = auth_ntlmssp_update(session->auth_ntlmssp_state,
223 secblob_in,
224 &chal_out);
225
226 if (!NT_STATUS_IS_OK(status) &&
227 !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
228 auth_ntlmssp_end(&session->auth_ntlmssp_state);
229 TALLOC_FREE(session);
230 return nt_status_squash(status);
231 }
232
233 *out_security_buffer = spnego_gen_auth_response(&chal_out,
234 status, OID_NTLMSSP);
235
236 *out_session_id = session->vuid;
237 return status;
238 } else if (in_security_buffer.data[0] == ASN1_CONTEXT(1)) {
239 DATA_BLOB auth = data_blob_null;
240 DATA_BLOB auth_out = data_blob_null;
241
242 /* its an auth packet */
243 if (!spnego_parse_auth(in_security_buffer, &auth)) {
244 TALLOC_FREE(session);
245 return NT_STATUS_LOGON_FAILURE;
246 }
247 /* For now, just SPNEGO NTLMSSP - krb5 goes here later.. */
248 status = auth_ntlmssp_update(session->auth_ntlmssp_state,
249 auth,
250 &auth_out);
251 if (!NT_STATUS_IS_OK(status)) {
252 auth_ntlmssp_end(&session->auth_ntlmssp_state);
253 TALLOC_FREE(session);
254 return nt_status_squash(status);
255 }
256
257 *out_security_buffer = spnego_gen_auth_response(&auth_out,
258 status, NULL);
259
260 *out_session_id = session->vuid;
261 } else if (strncmp((char *)(in_security_buffer.data), "NTLMSSP", 7) == 0) {
262
263 /* RAW NTLMSSP */
264 status = auth_ntlmssp_update(session->auth_ntlmssp_state,
265 in_security_buffer,
266 out_security_buffer);
267
268 if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
269 *out_session_id = session->vuid;
270 return status;
271 }
272 if (!NT_STATUS_IS_OK(status)) {
273 auth_ntlmssp_end(&session->auth_ntlmssp_state);
274 TALLOC_FREE(session);
275 return nt_status_squash(status);
276 }
277 *out_session_id = session->vuid;
278 }
279
280 /* TODO: setup session key for signing */
281
282 if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
283 lp_server_signing() == Required) {
284 session->do_signing = true;
285 }
286
287 if (session->auth_ntlmssp_state->server_info->guest) {
288 /* we map anonymous to guest internally */
289 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
290 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
291 /* force no signing */
292 session->do_signing = false;
293 }
294
295 session->server_info = session->auth_ntlmssp_state->server_info;
296 data_blob_free(&session->server_info->user_session_key);
297 session->server_info->user_session_key =
298 data_blob_talloc(
299 session->server_info,
300 session->auth_ntlmssp_state->ntlmssp_state->session_key.data,
301 session->auth_ntlmssp_state->ntlmssp_state->session_key.length);
302 if (session->auth_ntlmssp_state->ntlmssp_state->session_key.length > 0) {
303 if (session->server_info->user_session_key.data == NULL) {
304 TALLOC_FREE(session);
305 return NT_STATUS_NO_MEMORY;
306 }
307 }
308 session->session_key = session->server_info->user_session_key;
309
310 session->compat_vuser = talloc_zero(session, user_struct);
311 if (session->compat_vuser == NULL) {
312 TALLOC_FREE(session);
313 return NT_STATUS_NO_MEMORY;
314 }
315 session->compat_vuser->auth_ntlmssp_state = session->auth_ntlmssp_state;
316 session->compat_vuser->homes_snum = -1;
317 session->compat_vuser->server_info = session->server_info;
318 session->compat_vuser->session_keystr = NULL;
319 session->compat_vuser->vuid = session->vuid;
320 DLIST_ADD(session->sconn->smb1.sessions.validated_users, session->compat_vuser);
321
322 session->status = NT_STATUS_OK;
323
324 /*
325 * we attach the session to the request
326 * so that the response can be signed
327 */
328 req->session = session;
329 if (session->do_signing) {
330 req->do_signing = true;
331 }
332
333 *out_session_id = session->vuid;
334 return status;
335}
336
337NTSTATUS smbd_smb2_request_check_session(struct smbd_smb2_request *req)
338{
339 const uint8_t *inhdr;
340 int i = req->current_idx;
341 uint64_t in_session_id;
342 void *p;
343 struct smbd_smb2_session *session;
344
345 inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
346
347 in_session_id = BVAL(inhdr, SMB2_HDR_SESSION_ID);
348
349 /* lookup an existing session */
350 p = idr_find(req->sconn->smb2.sessions.idtree, in_session_id);
351 if (p == NULL) {
352 return NT_STATUS_USER_SESSION_DELETED;
353 }
354 session = talloc_get_type_abort(p, struct smbd_smb2_session);
355
356 if (!NT_STATUS_IS_OK(session->status)) {
357 return NT_STATUS_ACCESS_DENIED;
358 }
359
360 set_current_user_info(session->server_info->sanitized_username,
361 session->server_info->unix_name,
362 pdb_get_domain(session->server_info->sam_account));
363
364 req->session = session;
365 return NT_STATUS_OK;
366}
367
368NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
369{
370 const uint8_t *inbody;
371 int i = req->current_idx;
372 DATA_BLOB outbody;
373 size_t expected_body_size = 0x04;
374 size_t body_size;
375
376 if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
377 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
378 }
379
380 inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
381
382 body_size = SVAL(inbody, 0x00);
383 if (body_size != expected_body_size) {
384 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
385 }
386
387 /*
388 * TODO: cancel all outstanding requests on the session
389 * and delete all tree connections.
390 */
391 smbd_smb2_session_destructor(req->session);
392 /*
393 * we may need to sign the response, so we need to keep
394 * the session until the response is sent to the wire.
395 */
396 talloc_steal(req, req->session);
397
398 outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
399 if (outbody.data == NULL) {
400 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
401 }
402
403 SSVAL(outbody.data, 0x00, 0x04); /* struct size */
404 SSVAL(outbody.data, 0x02, 0); /* reserved */
405
406 return smbd_smb2_request_done(req, outbody, NULL);
407}
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