s4:smb2srv: We only support SMB 2.002.
[kai/samba-autobuild/.git] / source4 / smb_server / smb2 / negprot.c
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/service_smb_proto.h"
31 #include "smb_server/smb2/smb2_server.h"
32 #include "smbd/service_stream.h"
33 #include "param/param.h"
34 #include "librpc/ndr/libndr.h"
35
36 static NTSTATUS smb2srv_negprot_secblob(struct smb2srv_request *req, DATA_BLOB *_blob)
37 {
38         struct gensec_security *gensec_security;
39         DATA_BLOB null_data_blob = data_blob(NULL, 0);
40         DATA_BLOB blob;
41         NTSTATUS nt_status;
42         struct cli_credentials *server_credentials;
43
44         server_credentials = cli_credentials_init(req);
45         if (!server_credentials) {
46                 smbsrv_terminate_connection(req->smb_conn, "Failed to init server credentials\n");
47                 return NT_STATUS_NO_MEMORY;
48         }
49
50         cli_credentials_set_conf(server_credentials, req->smb_conn->lp_ctx);
51         nt_status = cli_credentials_set_machine_account(server_credentials, req->smb_conn->lp_ctx);
52         if (!NT_STATUS_IS_OK(nt_status)) {
53                 DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(nt_status)));
54                 talloc_free(server_credentials);
55                 server_credentials = NULL;
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, null_data_blob, &blob);
85         if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
86                 DEBUG(0, ("Failed to get SPNEGO to give us the first token: %s\n", nt_errstr(nt_status)));
87                 smbsrv_terminate_connection(req->smb_conn, "Failed to start SPNEGO - no first token\n");
88                 return nt_status;
89         }
90
91         *_blob = blob;
92         return NT_STATUS_OK;
93 }
94
95 static NTSTATUS smb2srv_negprot_backend(struct smb2srv_request *req, struct smb2_negprot *io)
96 {
97         NTSTATUS status;
98         struct timeval current_time;
99         struct timeval boot_time;
100         uint16_t i;
101         uint16_t dialect = 0;
102
103         /* we only do one dialect for now */
104         if (io->in.dialect_count < 1) {
105                 return NT_STATUS_NOT_SUPPORTED;
106         }
107         for (i=0; i < io->in.dialect_count; i++) {
108                 dialect = io->in.dialects[i];
109                 if (dialect == SMB2_DIALECT_REVISION_202) {
110                         break;
111                 }
112         }
113         if (dialect != SMB2_DIALECT_REVISION_202) {
114                 DEBUG(0,("Got unexpected SMB2 dialect %u\n", dialect));
115                 return NT_STATUS_NOT_SUPPORTED;
116         }
117
118         req->smb_conn->negotiate.protocol = PROTOCOL_SMB2;
119
120         current_time = timeval_current(); /* TODO: handle timezone?! */
121         boot_time = timeval_current(); /* TODO: fix me */
122
123         ZERO_STRUCT(io->out);
124         switch (lp_server_signing(req->smb_conn->lp_ctx)) {
125         case SMB_SIGNING_OFF:
126                 io->out.security_mode = 0;
127                 break;
128         case SMB_SIGNING_SUPPORTED:
129         case SMB_SIGNING_AUTO:
130                 io->out.security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
131                 break;
132         case SMB_SIGNING_REQUIRED:
133                 io->out.security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED;
134                 /* force signing on immediately */
135                 req->smb_conn->smb2_signing_required = true;
136                 break;
137         }
138         io->out.dialect_revision   = dialect;
139         io->out.capabilities       = 0;
140         io->out.max_transact_size  = lp_parm_ulong(req->smb_conn->lp_ctx, NULL, 
141                                                    "smb2", "max transaction size", 0x10000);
142         io->out.max_read_size      = lp_parm_ulong(req->smb_conn->lp_ctx, NULL, 
143                                                    "smb2", "max read size", 0x10000);
144         io->out.max_write_size     = lp_parm_ulong(req->smb_conn->lp_ctx, NULL, 
145                                                    "smb2", "max write size", 0x10000);
146         io->out.system_time        = timeval_to_nttime(&current_time);
147         io->out.server_start_time  = timeval_to_nttime(&boot_time);
148         io->out.reserved2          = 0;
149         status = smb2srv_negprot_secblob(req, &io->out.secblob);
150         NT_STATUS_NOT_OK_RETURN(status);
151
152         return NT_STATUS_OK;
153 }
154
155 static void smb2srv_negprot_send(struct smb2srv_request *req, struct smb2_negprot *io)
156 {
157         NTSTATUS status;
158         enum ndr_err_code ndr_err;
159
160         if (NT_STATUS_IS_ERR(req->status)) {
161                 smb2srv_send_error(req, req->status); /* TODO: is this correct? */
162                 return;
163         }
164
165         status = smb2srv_setup_reply(req, 0x40, true, io->out.secblob.length);
166         if (!NT_STATUS_IS_OK(status)) {
167                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
168                 talloc_free(req);
169                 return;
170         }
171
172         SSVAL(req->out.body, 0x02, io->out.security_mode);
173         SIVAL(req->out.body, 0x04, io->out.dialect_revision);
174         SIVAL(req->out.body, 0x06, io->out.reserved);
175         ndr_err = smbcli_push_guid(req->out.body, 0x08, &io->out.server_guid);
176         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
177                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
178                 talloc_free(req);
179                 return;
180         }
181         SIVAL(req->out.body, 0x18, io->out.capabilities);
182         SIVAL(req->out.body, 0x1C, io->out.max_transact_size);
183         SIVAL(req->out.body, 0x20, io->out.max_read_size);
184         SIVAL(req->out.body, 0x24, io->out.max_write_size);
185         push_nttime(req->out.body, 0x28, io->out.system_time);
186         push_nttime(req->out.body, 0x30, io->out.server_start_time);
187         SIVAL(req->out.body, 0x3C, io->out.reserved2);
188         status = smb2_push_o16s16_blob(&req->out, 0x38, io->out.secblob);
189         if (!NT_STATUS_IS_OK(status)) {
190                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
191                 talloc_free(req);
192                 return;
193         }
194
195         smb2srv_send_reply(req);
196 }
197
198 void smb2srv_negprot_recv(struct smb2srv_request *req)
199 {
200         struct smb2_negprot *io;
201         int i;
202         enum ndr_err_code ndr_err;
203
204         if (req->in.body_size < 0x26) {
205                 smbsrv_terminate_connection(req->smb_conn, "Bad body size in SMB2 negprot");
206                 return;
207         }
208
209         io = talloc(req, struct smb2_negprot);
210         if (!io) {
211                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
212                 talloc_free(req);
213                 return;
214         }
215
216         io->in.dialect_count = SVAL(req->in.body, 0x02);
217         io->in.security_mode = SVAL(req->in.body, 0x04);
218         io->in.reserved      = SVAL(req->in.body, 0x06);
219         io->in.capabilities  = IVAL(req->in.body, 0x08);
220         ndr_err = smbcli_pull_guid(req->in.body, 0xC, &io->in.client_guid);
221         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
222                 smbsrv_terminate_connection(req->smb_conn, "Bad GUID in SMB2 negprot");
223                 talloc_free(req);
224                 return;
225         }
226         io->in.start_time = smbcli_pull_nttime(req->in.body, 0x1C);
227
228         io->in.dialects = talloc_array(req, uint16_t, io->in.dialect_count);
229         if (io->in.dialects == NULL) {
230                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
231                 talloc_free(req);
232                 return;
233         }
234         for (i=0;i<io->in.dialect_count;i++) {
235                 io->in.dialects[i] = SVAL(req->in.body, 0x24+i*2);
236         }
237
238         req->status = smb2srv_negprot_backend(req, io);
239
240         if (req->control_flags & SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY) {
241                 talloc_free(req);
242                 return;
243         }
244         smb2srv_negprot_send(req, io);
245 }
246
247 /*
248  * reply to a SMB negprot request with dialect "SMB 2.002"
249  */
250 void smb2srv_reply_smb_negprot(struct smbsrv_request *smb_req)
251 {
252         struct smb2srv_request *req;
253         uint32_t body_fixed_size = 0x26;
254
255         req = talloc_zero(smb_req->smb_conn, struct smb2srv_request);
256         if (!req) goto nomem;
257         req->smb_conn           = smb_req->smb_conn;
258         req->request_time       = smb_req->request_time;
259         talloc_steal(req, smb_req);
260
261         req->in.size      = NBT_HDR_SIZE+SMB2_HDR_BODY+body_fixed_size;
262         req->in.allocated = req->in.size;
263         req->in.buffer    = talloc_array(req, uint8_t, req->in.allocated);
264         if (!req->in.buffer) goto nomem;
265         req->in.hdr       = req->in.buffer + NBT_HDR_SIZE;
266         req->in.body      = req->in.hdr + SMB2_HDR_BODY;
267         req->in.body_size = body_fixed_size;
268         req->in.dynamic   = NULL;
269
270         smb2srv_setup_bufinfo(req);
271
272         SIVAL(req->in.hdr, 0,                           SMB2_MAGIC);
273         SSVAL(req->in.hdr, SMB2_HDR_LENGTH,             SMB2_HDR_BODY);
274         SSVAL(req->in.hdr, SMB2_HDR_EPOCH,              0);
275         SIVAL(req->in.hdr, SMB2_HDR_STATUS,             0);
276         SSVAL(req->in.hdr, SMB2_HDR_OPCODE,             SMB2_OP_NEGPROT);
277         SSVAL(req->in.hdr, SMB2_HDR_CREDIT,             0);
278         SIVAL(req->in.hdr, SMB2_HDR_FLAGS,              0);
279         SIVAL(req->in.hdr, SMB2_HDR_NEXT_COMMAND,       0);
280         SBVAL(req->in.hdr, SMB2_HDR_MESSAGE_ID,         0);
281         SIVAL(req->in.hdr, SMB2_HDR_PID,                0);
282         SIVAL(req->in.hdr, SMB2_HDR_TID,                0);
283         SBVAL(req->in.hdr, SMB2_HDR_SESSION_ID,         0);
284         memset(req->in.hdr+SMB2_HDR_SIGNATURE, 0, 16);
285
286         /* this seems to be a bug, they use 0x24 but the length is 0x26 */
287         SSVAL(req->in.body, 0x00, 0x24);
288
289         SSVAL(req->in.body, 0x02, 1);
290         memset(req->in.body+0x04, 0, 32);
291         SSVAL(req->in.body, 0x24, SMB2_DIALECT_REVISION_202);
292
293         smb2srv_negprot_recv(req);
294         return;
295 nomem:
296         smbsrv_terminate_connection(smb_req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
297         talloc_free(req);
298         return;
299 }