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talloc_stack: Call talloc destructors while frame is still around
[Samba.git] / source4 / smb_server / smb2 / negprot.c
blob4aaaf46793bee4bce1a438e3e896b4042c8edc43
1 /*
2 Unix SMB2 implementation.
3
4 Copyright (C) Andrew Bartlett 2001-2005
5 Copyright (C) Stefan Metzmacher 2005
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 "auth/credentials/credentials.h"
23 #include "auth/auth.h"
24 #include "auth/gensec/gensec.h"
25 #include "libcli/raw/libcliraw.h"
26 #include "libcli/raw/raw_proto.h"
27 #include "libcli/smb2/smb2.h"
28 #include "libcli/smb2/smb2_calls.h"
29 #include "smb_server/smb_server.h"
30 #include "smb_server/smb2/smb2_server.h"
31 #include "smbd/service_stream.h"
32 #include "param/param.h"
33
34 static NTSTATUS smb2srv_negprot_secblob(struct smb2srv_request *req, DATA_BLOB *_blob)
35 {
36 struct gensec_security *gensec_security;
37 DATA_BLOB null_data_blob = data_blob(NULL, 0);
38 DATA_BLOB blob;
39 NTSTATUS nt_status;
40 struct cli_credentials *server_credentials;
41
42 server_credentials = cli_credentials_init(req);
43 if (!server_credentials) {
44 smbsrv_terminate_connection(req->smb_conn, "Failed to init server credentials\n");
45 return NT_STATUS_NO_MEMORY;
46 }
47
48 cli_credentials_set_conf(server_credentials, req->smb_conn->lp_ctx);
49 nt_status = cli_credentials_set_machine_account(server_credentials, req->smb_conn->lp_ctx);
50 if (!NT_STATUS_IS_OK(nt_status)) {
51 DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(nt_status)));
52 /*
53 * We keep the server_credentials as anonymous
54 * this is required for the spoolss.notify test
55 */
56 }
57
58 req->smb_conn->negotiate.server_credentials = talloc_steal(req->smb_conn, server_credentials);
59
60 nt_status = samba_server_gensec_start(req,
61 req->smb_conn->connection->event.ctx,
62 req->smb_conn->connection->msg_ctx,
63 req->smb_conn->lp_ctx,
64 server_credentials,
65 "cifs",
66 &gensec_security);
67 if (!NT_STATUS_IS_OK(nt_status)) {
68 DEBUG(0, ("Failed to start GENSEC: %s\n", nt_errstr(nt_status)));
69 smbsrv_terminate_connection(req->smb_conn, "Failed to start GENSEC\n");
70 return nt_status;
71 }
72
73 gensec_set_target_service(gensec_security, "cifs");
74
75 gensec_set_credentials(gensec_security, server_credentials);
76
77 nt_status = gensec_start_mech_by_oid(gensec_security, GENSEC_OID_SPNEGO);
78 if (!NT_STATUS_IS_OK(nt_status)) {
79 DEBUG(0, ("Failed to start SPNEGO: %s\n", nt_errstr(nt_status)));
80 smbsrv_terminate_connection(req->smb_conn, "Failed to start SPNEGO\n");
81 return nt_status;
82 }
83
84 nt_status = gensec_update(gensec_security, req,
85 null_data_blob, &blob);
86 if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
87 DEBUG(0, ("Failed to get SPNEGO to give us the first token: %s\n", nt_errstr(nt_status)));
88 smbsrv_terminate_connection(req->smb_conn, "Failed to start SPNEGO - no first token\n");
89 return nt_status;
90 }
91
92 *_blob = blob;
93 return NT_STATUS_OK;
94 }
95
96 static NTSTATUS smb2srv_negprot_backend(struct smb2srv_request *req, struct smb2_negprot *io)
97 {
98 NTSTATUS status;
99 struct timeval current_time;
100 struct timeval boot_time;
101 uint16_t i;
102 uint16_t dialect = 0;
103 enum smb_signing_setting signing_setting;
104 struct loadparm_context *lp_ctx = req->smb_conn->lp_ctx;
105
106 /* we only do one dialect for now */
107 if (io->in.dialect_count < 1) {
108 return NT_STATUS_NOT_SUPPORTED;
109 }
110 for (i=0; i < io->in.dialect_count; i++) {
111 dialect = io->in.dialects[i];
112 if (dialect == SMB2_DIALECT_REVISION_202) {
113 break;
114 }
115 }
116 if (dialect != SMB2_DIALECT_REVISION_202) {
117 DEBUG(0,("Got unexpected SMB2 dialect %u\n", dialect));
118 return NT_STATUS_NOT_SUPPORTED;
119 }
120
121 req->smb_conn->negotiate.protocol = PROTOCOL_SMB2_02;
122
123 current_time = timeval_current(); /* TODO: handle timezone?! */
124 boot_time = timeval_current(); /* TODO: fix me */
125
126 ZERO_STRUCT(io->out);
127
128 signing_setting = lpcfg_server_signing(lp_ctx);
129 if (signing_setting == SMB_SIGNING_DEFAULT) {
130 /*
131 * If we are a domain controller, SMB signing is
132 * really important, as it can prevent a number of
133 * attacks on communications between us and the
134 * clients
135 *
136 * However, it really sucks (no sendfile, CPU
137 * overhead) performance-wise when used on a
138 * file server, so disable it by default
139 * on non-DCs
140 */
141
142 if (lpcfg_server_role(lp_ctx) >= ROLE_ACTIVE_DIRECTORY_DC) {
143 signing_setting = SMB_SIGNING_REQUIRED;
144 } else {
145 signing_setting = SMB_SIGNING_OFF;
146 }
147 }
148
149 switch (signing_setting) {
150 case SMB_SIGNING_DEFAULT:
151 case SMB_SIGNING_IPC_DEFAULT:
152 smb_panic(__location__);
153 break;
154 case SMB_SIGNING_OFF:
155 io->out.security_mode = 0;
156 break;
157 case SMB_SIGNING_DESIRED:
158 case SMB_SIGNING_IF_REQUIRED:
159 io->out.security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
160 break;
161 case SMB_SIGNING_REQUIRED:
162 io->out.security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED;
163 /* force signing on immediately */
164 req->smb_conn->smb2_signing_required = true;
165 break;
166 }
167 io->out.dialect_revision = dialect;
168 io->out.capabilities = 0;
169 io->out.max_transact_size = lpcfg_parm_ulong(req->smb_conn->lp_ctx, NULL,
170 "smb2", "max transaction size", 0x10000);
171 io->out.max_read_size = lpcfg_parm_ulong(req->smb_conn->lp_ctx, NULL,
172 "smb2", "max read size", 0x10000);
173 io->out.max_write_size = lpcfg_parm_ulong(req->smb_conn->lp_ctx, NULL,
174 "smb2", "max write size", 0x10000);
175 io->out.system_time = timeval_to_nttime(&current_time);
176 io->out.server_start_time = timeval_to_nttime(&boot_time);
177 io->out.reserved2 = 0;
178 status = smb2srv_negprot_secblob(req, &io->out.secblob);
179 NT_STATUS_NOT_OK_RETURN(status);
180
181 return NT_STATUS_OK;
182 }
183
184 static void smb2srv_negprot_send(struct smb2srv_request *req, struct smb2_negprot *io)
185 {
186 NTSTATUS status;
187
188 if (NT_STATUS_IS_ERR(req->status)) {
189 smb2srv_send_error(req, req->status); /* TODO: is this correct? */
190 return;
191 }
192
193 status = smb2srv_setup_reply(req, 0x40, true, io->out.secblob.length);
194 if (!NT_STATUS_IS_OK(status)) {
195 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
196 talloc_free(req);
197 return;
198 }
199
200 SSVAL(req->out.body, 0x02, io->out.security_mode);
201 SIVAL(req->out.body, 0x04, io->out.dialect_revision);
202 SIVAL(req->out.body, 0x06, io->out.reserved);
203 status = smbcli_push_guid(req->out.body, 0x08, &io->out.server_guid);
204 if (!NT_STATUS_IS_OK(status)) {
205 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
206 talloc_free(req);
207 return;
208 }
209 SIVAL(req->out.body, 0x18, io->out.capabilities);
210 SIVAL(req->out.body, 0x1C, io->out.max_transact_size);
211 SIVAL(req->out.body, 0x20, io->out.max_read_size);
212 SIVAL(req->out.body, 0x24, io->out.max_write_size);
213 push_nttime(req->out.body, 0x28, io->out.system_time);
214 push_nttime(req->out.body, 0x30, io->out.server_start_time);
215 SIVAL(req->out.body, 0x3C, io->out.reserved2);
216 status = smb2_push_o16s16_blob(&req->out, 0x38, io->out.secblob);
217 if (!NT_STATUS_IS_OK(status)) {
218 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
219 talloc_free(req);
220 return;
221 }
222
223 smb2srv_send_reply(req);
224 }
225
226 void smb2srv_negprot_recv(struct smb2srv_request *req)
227 {
228 struct smb2_negprot *io;
229 int i;
230
231 if (req->in.body_size < 0x26) {
232 smbsrv_terminate_connection(req->smb_conn, "Bad body size in SMB2 negprot");
233 return;
234 }
235
236 io = talloc(req, struct smb2_negprot);
237 if (!io) {
238 smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
239 talloc_free(req);
240 return;
241 }
242
243 io->in.dialect_count = SVAL(req->in.body, 0x02);
244 io->in.security_mode = SVAL(req->in.body, 0x04);
245 io->in.reserved = SVAL(req->in.body, 0x06);
246 io->in.capabilities = IVAL(req->in.body, 0x08);
247 req->status = smbcli_pull_guid(req->in.body, 0xC, &io->in.client_guid);
248 if (!NT_STATUS_IS_OK(req->status)) {
249 smbsrv_terminate_connection(req->smb_conn, "Bad GUID in SMB2 negprot");
250 talloc_free(req);
251 return;
252 }
253 io->in.start_time = smbcli_pull_nttime(req->in.body, 0x1C);
254
255 io->in.dialects = talloc_array(req, uint16_t, io->in.dialect_count);
256 if (io->in.dialects == NULL) {
257 smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
258 talloc_free(req);
259 return;
260 }
261 for (i=0;i<io->in.dialect_count;i++) {
262 io->in.dialects[i] = SVAL(req->in.body, 0x24+i*2);
263 }
264
265 req->status = smb2srv_negprot_backend(req, io);
266
267 if (req->control_flags & SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY) {
268 talloc_free(req);
269 return;
270 }
271 smb2srv_negprot_send(req, io);
272 }
273
274 /*
275 * reply to a SMB negprot request with dialect "SMB 2.002"
276 */
277 void smb2srv_reply_smb_negprot(struct smbsrv_request *smb_req)
278 {
279 struct smb2srv_request *req;
280 uint32_t body_fixed_size = 0x26;
281
282 req = talloc_zero(smb_req->smb_conn, struct smb2srv_request);
283 if (!req) goto nomem;
284 req->smb_conn = smb_req->smb_conn;
285 req->request_time = smb_req->request_time;
286 talloc_steal(req, smb_req);
287
288 req->in.size = NBT_HDR_SIZE+SMB2_HDR_BODY+body_fixed_size;
289 req->in.allocated = req->in.size;
290 req->in.buffer = talloc_array(req, uint8_t, req->in.allocated);
291 if (!req->in.buffer) goto nomem;
292 req->in.hdr = req->in.buffer + NBT_HDR_SIZE;
293 req->in.body = req->in.hdr + SMB2_HDR_BODY;
294 req->in.body_size = body_fixed_size;
295 req->in.dynamic = NULL;
296
297 smb2srv_setup_bufinfo(req);
298
299 SIVAL(req->in.hdr, 0, SMB2_MAGIC);
300 SSVAL(req->in.hdr, SMB2_HDR_LENGTH, SMB2_HDR_BODY);
301 SSVAL(req->in.hdr, SMB2_HDR_EPOCH, 0);
302 SIVAL(req->in.hdr, SMB2_HDR_STATUS, 0);
303 SSVAL(req->in.hdr, SMB2_HDR_OPCODE, SMB2_OP_NEGPROT);
304 SSVAL(req->in.hdr, SMB2_HDR_CREDIT, 0);
305 SIVAL(req->in.hdr, SMB2_HDR_FLAGS, 0);
306 SIVAL(req->in.hdr, SMB2_HDR_NEXT_COMMAND, 0);
307 SBVAL(req->in.hdr, SMB2_HDR_MESSAGE_ID, 0);
308 SIVAL(req->in.hdr, SMB2_HDR_PID, 0);
309 SIVAL(req->in.hdr, SMB2_HDR_TID, 0);
310 SBVAL(req->in.hdr, SMB2_HDR_SESSION_ID, 0);
311 memset(req->in.hdr+SMB2_HDR_SIGNATURE, 0, 16);
312
313 /* this seems to be a bug, they use 0x24 but the length is 0x26 */
314 SSVAL(req->in.body, 0x00, 0x24);
315
316 SSVAL(req->in.body, 0x02, 1);
317 memset(req->in.body+0x04, 0, 32);
318 SSVAL(req->in.body, 0x24, SMB2_DIALECT_REVISION_202);
319
320 smb2srv_negprot_recv(req);
321 return;
322 nomem:
323 smbsrv_terminate_connection(smb_req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
324 talloc_free(req);
325 return;
326 }
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