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source3/wscript: Introduce auto mode to build ceph vfs modules
[Samba.git] / source4 / smb_server / smb2 / negprot.c
blob048d7b46837fb1296892fa223bbc0d5722e07605
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 "samba/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 =
43 cli_credentials_init_server(req, req->smb_conn->lp_ctx);
44 if (server_credentials == NULL) {
45 DBG_DEBUG("Failed to obtain server credentials, "
46 "perhaps a standalone server?\n");
47 /*
48 * Create anon server credentials for for the
49 * spoolss.notify test.
50 */
51 server_credentials = cli_credentials_init_anon(req);
52 if (server_credentials == NULL) {
53 smbsrv_terminate_connection(req->smb_conn,
54 "Failed to init server credentials\n");
55 return NT_STATUS_NO_MEMORY;
56 }
57 }
58
59 req->smb_conn->negotiate.server_credentials = talloc_steal(req->smb_conn, server_credentials);
60
61 nt_status = samba_server_gensec_start(req,
62 req->smb_conn->connection->event.ctx,
63 req->smb_conn->connection->msg_ctx,
64 req->smb_conn->lp_ctx,
65 server_credentials,
66 "cifs",
67 &gensec_security);
68 if (!NT_STATUS_IS_OK(nt_status)) {
69 DEBUG(0, ("Failed to start GENSEC: %s\n", nt_errstr(nt_status)));
70 smbsrv_terminate_connection(req->smb_conn, "Failed to start GENSEC\n");
71 return nt_status;
72 }
73
74 gensec_set_target_service(gensec_security, "cifs");
75
76 gensec_set_credentials(gensec_security, server_credentials);
77
78 nt_status = gensec_start_mech_by_oid(gensec_security, GENSEC_OID_SPNEGO);
79 if (!NT_STATUS_IS_OK(nt_status)) {
80 DEBUG(0, ("Failed to start SPNEGO: %s\n", nt_errstr(nt_status)));
81 smbsrv_terminate_connection(req->smb_conn, "Failed to start SPNEGO\n");
82 return nt_status;
83 }
84
85 nt_status = gensec_update(gensec_security, req,
86 null_data_blob, &blob);
87 if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
88 DEBUG(0, ("Failed to get SPNEGO to give us the first token: %s\n", nt_errstr(nt_status)));
89 smbsrv_terminate_connection(req->smb_conn, "Failed to start SPNEGO - no first token\n");
90 return nt_status;
91 }
92
93 *_blob = blob;
94 return NT_STATUS_OK;
95 }
96
97 static NTSTATUS smb2srv_negprot_backend(struct smb2srv_request *req, struct smb2_negprot *io)
98 {
99 NTSTATUS status;
100 struct timeval current_time;
101 struct timeval boot_time;
102 uint16_t i;
103 uint16_t dialect = 0;
104 enum smb_signing_setting signing_setting;
105 struct loadparm_context *lp_ctx = req->smb_conn->lp_ctx;
106
107 /* we only do one dialect for now */
108 if (io->in.dialect_count < 1) {
109 return NT_STATUS_NOT_SUPPORTED;
110 }
111 for (i=0; i < io->in.dialect_count; i++) {
112 dialect = io->in.dialects[i];
113 if (dialect == SMB2_DIALECT_REVISION_202) {
114 break;
115 }
116 }
117 if (dialect != SMB2_DIALECT_REVISION_202) {
118 DEBUG(0,("Got unexpected SMB2 dialect %u\n", dialect));
119 return NT_STATUS_NOT_SUPPORTED;
120 }
121
122 req->smb_conn->negotiate.protocol = PROTOCOL_SMB2_02;
123
124 current_time = timeval_current(); /* TODO: handle timezone?! */
125 boot_time = timeval_current(); /* TODO: fix me */
126
127 ZERO_STRUCT(io->out);
128
129 signing_setting = lpcfg_server_signing(lp_ctx);
130 if (signing_setting == SMB_SIGNING_DEFAULT) {
131 /*
132 * If we are a domain controller, SMB signing is
133 * really important, as it can prevent a number of
134 * attacks on communications between us and the
135 * clients
136 *
137 * However, it really sucks (no sendfile, CPU
138 * overhead) performance-wise when used on a
139 * file server, so disable it by default
140 * on non-DCs
141 */
142
143 if (lpcfg_server_role(lp_ctx) >= ROLE_ACTIVE_DIRECTORY_DC) {
144 signing_setting = SMB_SIGNING_REQUIRED;
145 } else {
146 signing_setting = SMB_SIGNING_OFF;
147 }
148 }
149
150 switch (signing_setting) {
151 case SMB_SIGNING_DEFAULT:
152 case SMB_SIGNING_IPC_DEFAULT:
153 smb_panic(__location__);
154 break;
155 case SMB_SIGNING_OFF:
156 io->out.security_mode = 0;
157 break;
158 case SMB_SIGNING_DESIRED:
159 case SMB_SIGNING_IF_REQUIRED:
160 io->out.security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
161 break;
162 case SMB_SIGNING_REQUIRED:
163 io->out.security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED;
164 /* force signing on immediately */
165 req->smb_conn->smb2_signing_required = true;
166 break;
167 }
168 io->out.dialect_revision = dialect;
169 io->out.capabilities = 0;
170 io->out.max_transact_size = lpcfg_parm_ulong(req->smb_conn->lp_ctx, NULL,
171 "smb2", "max transaction size", 0x10000);
172 io->out.max_read_size = lpcfg_parm_ulong(req->smb_conn->lp_ctx, NULL,
173 "smb2", "max read size", 0x10000);
174 io->out.max_write_size = lpcfg_parm_ulong(req->smb_conn->lp_ctx, NULL,
175 "smb2", "max write size", 0x10000);
176 io->out.system_time = timeval_to_nttime(&current_time);
177 io->out.server_start_time = timeval_to_nttime(&boot_time);
178 io->out.reserved2 = 0;
179 status = smb2srv_negprot_secblob(req, &io->out.secblob);
180 NT_STATUS_NOT_OK_RETURN(status);
181
182 return NT_STATUS_OK;
183 }
184
185 static void smb2srv_negprot_send(struct smb2srv_request *req, struct smb2_negprot *io)
186 {
187 NTSTATUS status;
188
189 if (NT_STATUS_IS_ERR(req->status)) {
190 smb2srv_send_error(req, req->status); /* TODO: is this correct? */
191 return;
192 }
193
194 status = smb2srv_setup_reply(req, 0x40, true, io->out.secblob.length);
195 if (!NT_STATUS_IS_OK(status)) {
196 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
197 talloc_free(req);
198 return;
199 }
200
201 SSVAL(req->out.body, 0x02, io->out.security_mode);
202 SIVAL(req->out.body, 0x04, io->out.dialect_revision);
203 SIVAL(req->out.body, 0x06, io->out.reserved);
204 status = smbcli_push_guid(req->out.body, 0x08, &io->out.server_guid);
205 if (!NT_STATUS_IS_OK(status)) {
206 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
207 talloc_free(req);
208 return;
209 }
210 SIVAL(req->out.body, 0x18, io->out.capabilities);
211 SIVAL(req->out.body, 0x1C, io->out.max_transact_size);
212 SIVAL(req->out.body, 0x20, io->out.max_read_size);
213 SIVAL(req->out.body, 0x24, io->out.max_write_size);
214 push_nttime(req->out.body, 0x28, io->out.system_time);
215 push_nttime(req->out.body, 0x30, io->out.server_start_time);
216 SIVAL(req->out.body, 0x3C, io->out.reserved2);
217 status = smb2_push_o16s16_blob(&req->out, 0x38, io->out.secblob);
218 if (!NT_STATUS_IS_OK(status)) {
219 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
220 talloc_free(req);
221 return;
222 }
223
224 smb2srv_send_reply(req);
225 }
226
227 void smb2srv_negprot_recv(struct smb2srv_request *req)
228 {
229 struct smb2_negprot *io;
230 int i;
231
232 if (req->in.body_size < 0x26) {
233 smbsrv_terminate_connection(req->smb_conn, "Bad body size in SMB2 negprot");
234 return;
235 }
236
237 io = talloc(req, struct smb2_negprot);
238 if (!io) {
239 smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
240 talloc_free(req);
241 return;
242 }
243
244 io->in.dialect_count = SVAL(req->in.body, 0x02);
245 io->in.security_mode = SVAL(req->in.body, 0x04);
246 io->in.reserved = SVAL(req->in.body, 0x06);
247 io->in.capabilities = IVAL(req->in.body, 0x08);
248 req->status = smbcli_pull_guid(req->in.body, 0xC, &io->in.client_guid);
249 if (!NT_STATUS_IS_OK(req->status)) {
250 smbsrv_terminate_connection(req->smb_conn, "Bad GUID in SMB2 negprot");
251 talloc_free(req);
252 return;
253 }
254 io->in.start_time = smbcli_pull_nttime(req->in.body, 0x1C);
255
256 io->in.dialects = talloc_array(req, uint16_t, io->in.dialect_count);
257 if (io->in.dialects == NULL) {
258 smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
259 talloc_free(req);
260 return;
261 }
262 for (i=0;i<io->in.dialect_count;i++) {
263 io->in.dialects[i] = SVAL(req->in.body, 0x24+i*2);
264 }
265
266 req->status = smb2srv_negprot_backend(req, io);
267
268 if (req->control_flags & SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY) {
269 talloc_free(req);
270 return;
271 }
272 smb2srv_negprot_send(req, io);
273 }
274
275 /*
276 * reply to a SMB negprot request with dialect "SMB 2.002"
277 */
278 void smb2srv_reply_smb_negprot(struct smbsrv_request *smb_req)
279 {
280 struct smb2srv_request *req;
281 uint32_t body_fixed_size = 0x26;
282
283 req = talloc_zero(smb_req->smb_conn, struct smb2srv_request);
284 if (!req) goto nomem;
285 req->smb_conn = smb_req->smb_conn;
286 req->request_time = smb_req->request_time;
287 talloc_steal(req, smb_req);
288
289 req->in.size = NBT_HDR_SIZE+SMB2_HDR_BODY+body_fixed_size;
290 req->in.allocated = req->in.size;
291 req->in.buffer = talloc_array(req, uint8_t, req->in.allocated);
292 if (!req->in.buffer) goto nomem;
293 req->in.hdr = req->in.buffer + NBT_HDR_SIZE;
294 req->in.body = req->in.hdr + SMB2_HDR_BODY;
295 req->in.body_size = body_fixed_size;
296 req->in.dynamic = NULL;
297
298 smb2srv_setup_bufinfo(req);
299
300 SIVAL(req->in.hdr, 0, SMB2_MAGIC);
301 SSVAL(req->in.hdr, SMB2_HDR_LENGTH, SMB2_HDR_BODY);
302 SSVAL(req->in.hdr, SMB2_HDR_EPOCH, 0);
303 SIVAL(req->in.hdr, SMB2_HDR_STATUS, 0);
304 SSVAL(req->in.hdr, SMB2_HDR_OPCODE, SMB2_OP_NEGPROT);
305 SSVAL(req->in.hdr, SMB2_HDR_CREDIT, 0);
306 SIVAL(req->in.hdr, SMB2_HDR_FLAGS, 0);
307 SIVAL(req->in.hdr, SMB2_HDR_NEXT_COMMAND, 0);
308 SBVAL(req->in.hdr, SMB2_HDR_MESSAGE_ID, 0);
309 SIVAL(req->in.hdr, SMB2_HDR_PID, 0);
310 SIVAL(req->in.hdr, SMB2_HDR_TID, 0);
311 SBVAL(req->in.hdr, SMB2_HDR_SESSION_ID, 0);
312 memset(req->in.hdr+SMB2_HDR_SIGNATURE, 0, 16);
313
314 /* this seems to be a bug, they use 0x24 but the length is 0x26 */
315 SSVAL(req->in.body, 0x00, 0x24);
316
317 SSVAL(req->in.body, 0x02, 1);
318 memset(req->in.body+0x04, 0, 32);
319 SSVAL(req->in.body, 0x24, SMB2_DIALECT_REVISION_202);
320
321 smb2srv_negprot_recv(req);
322 return;
323 nomem:
324 smbsrv_terminate_connection(smb_req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
325 talloc_free(req);
326 return;
327 }
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