smb2srv: correctly hold the signing state per session
[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/gensec/gensec.h"
24 #include "libcli/raw/libcliraw.h"
25 #include "libcli/raw/raw_proto.h"
26 #include "libcli/smb2/smb2.h"
27 #include "libcli/smb2/smb2_calls.h"
28 #include "smb_server/smb_server.h"
29 #include "smb_server/service_smb_proto.h"
30 #include "smb_server/smb2/smb2_server.h"
31 #include "smbd/service_stream.h"
32 #include "param/param.h"
33 #include "librpc/ndr/libndr.h"
34
35 static NTSTATUS smb2srv_negprot_secblob(struct smb2srv_request *req, DATA_BLOB *_blob)
36 {
37         struct gensec_security *gensec_security;
38         DATA_BLOB null_data_blob = data_blob(NULL, 0);
39         DATA_BLOB blob;
40         NTSTATUS nt_status;
41         struct cli_credentials *server_credentials;
42
43         nt_status = gensec_server_start(req,
44                                         req->smb_conn->connection->event.ctx,
45                                         req->smb_conn->lp_ctx,
46                                         req->smb_conn->connection->msg_ctx,
47                                         &gensec_security);
48         if (!NT_STATUS_IS_OK(nt_status)) {
49                 DEBUG(0, ("Failed to start GENSEC: %s\n", nt_errstr(nt_status)));
50                 smbsrv_terminate_connection(req->smb_conn, "Failed to start GENSEC\n");
51                 return nt_status;
52         }
53
54         server_credentials = cli_credentials_init(req);
55         if (!server_credentials) {
56                 smbsrv_terminate_connection(req->smb_conn, "Failed to init server credentials\n");
57                 return NT_STATUS_NO_MEMORY;
58         }
59
60         cli_credentials_set_conf(server_credentials, req->smb_conn->lp_ctx);
61         nt_status = cli_credentials_set_machine_account(server_credentials, req->smb_conn->lp_ctx);
62         if (!NT_STATUS_IS_OK(nt_status)) {
63                 DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(nt_status)));
64                 talloc_free(server_credentials);
65                 server_credentials = NULL;
66         }
67
68         req->smb_conn->negotiate.server_credentials = talloc_steal(req->smb_conn, server_credentials);
69
70         gensec_set_target_service(gensec_security, "cifs");
71
72         gensec_set_credentials(gensec_security, server_credentials);
73
74         nt_status = gensec_start_mech_by_oid(gensec_security, GENSEC_OID_SPNEGO);
75         if (!NT_STATUS_IS_OK(nt_status)) {
76                 DEBUG(0, ("Failed to start SPNEGO: %s\n", nt_errstr(nt_status)));
77                 smbsrv_terminate_connection(req->smb_conn, "Failed to start SPNEGO\n");
78                 return nt_status;
79         }
80
81         nt_status = gensec_update(gensec_security, req, null_data_blob, &blob);
82         if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
83                 DEBUG(0, ("Failed to get SPNEGO to give us the first token: %s\n", nt_errstr(nt_status)));
84                 smbsrv_terminate_connection(req->smb_conn, "Failed to start SPNEGO - no first token\n");
85                 return nt_status;
86         }
87
88         *_blob = blob;
89         return NT_STATUS_OK;
90 }
91
92 static NTSTATUS smb2srv_negprot_backend(struct smb2srv_request *req, struct smb2_negprot *io)
93 {
94         NTSTATUS status;
95         struct timeval current_time;
96         struct timeval boot_time;
97
98         /* we only do one dialect for now */
99         if (io->in.dialect_count < 1) {
100                 return NT_STATUS_NOT_SUPPORTED;
101         }
102         if (io->in.dialects[0] != 0 &&
103             io->in.dialects[0] != SMB2_DIALECT_REVISION) {
104                 DEBUG(0,("Got unexpected SMB2 dialect %u\n", io->in.dialects[0]));
105                 return NT_STATUS_NOT_SUPPORTED;
106         }
107
108         req->smb_conn->negotiate.protocol = PROTOCOL_SMB2;
109
110         current_time = timeval_current(); /* TODO: handle timezone?! */
111         boot_time = timeval_current(); /* TODO: fix me */
112
113         ZERO_STRUCT(io->out);
114         switch (lp_server_signing(req->smb_conn->lp_ctx)) {
115         case SMB_SIGNING_OFF:
116                 io->out.security_mode = 0;
117                 break;
118         case SMB_SIGNING_SUPPORTED:
119         case SMB_SIGNING_AUTO:
120                 io->out.security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
121                 break;
122         case SMB_SIGNING_REQUIRED:
123                 io->out.security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED;
124                 /* force signing on immediately */
125                 req->smb_conn->smb2_signing_required = true;
126                 break;
127         }
128         io->out.dialect_revision   = SMB2_DIALECT_REVISION;
129         io->out.capabilities       = 0;
130         io->out.max_transact_size  = lp_parm_ulong(req->smb_conn->lp_ctx, NULL, 
131                                                    "smb2", "max transaction size", 0x10000);
132         io->out.max_read_size      = lp_parm_ulong(req->smb_conn->lp_ctx, NULL, 
133                                                    "smb2", "max read size", 0x10000);
134         io->out.max_write_size     = lp_parm_ulong(req->smb_conn->lp_ctx, NULL, 
135                                                    "smb2", "max write size", 0x10000);
136         io->out.system_time        = timeval_to_nttime(&current_time);
137         io->out.server_start_time  = timeval_to_nttime(&boot_time);
138         io->out.reserved2          = 0;
139         status = smb2srv_negprot_secblob(req, &io->out.secblob);
140         NT_STATUS_NOT_OK_RETURN(status);
141
142         return NT_STATUS_OK;
143 }
144
145 static void smb2srv_negprot_send(struct smb2srv_request *req, struct smb2_negprot *io)
146 {
147         NTSTATUS status;
148         enum ndr_err_code ndr_err;
149
150         if (NT_STATUS_IS_ERR(req->status)) {
151                 smb2srv_send_error(req, req->status); /* TODO: is this correct? */
152                 return;
153         }
154
155         status = smb2srv_setup_reply(req, 0x40, true, io->out.secblob.length);
156         if (!NT_STATUS_IS_OK(status)) {
157                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
158                 talloc_free(req);
159                 return;
160         }
161
162         SSVAL(req->out.body, 0x02, io->out.security_mode);
163         SIVAL(req->out.body, 0x04, io->out.dialect_revision);
164         SIVAL(req->out.body, 0x06, io->out.reserved);
165         ndr_err = smbcli_push_guid(req->out.body, 0x08, &io->out.server_guid);
166         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
167                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
168                 talloc_free(req);
169                 return;
170         }
171         SIVAL(req->out.body, 0x18, io->out.capabilities);
172         SIVAL(req->out.body, 0x1C, io->out.max_transact_size);
173         SIVAL(req->out.body, 0x20, io->out.max_read_size);
174         SIVAL(req->out.body, 0x24, io->out.max_write_size);
175         push_nttime(req->out.body, 0x28, io->out.system_time);
176         push_nttime(req->out.body, 0x30, io->out.server_start_time);
177         SIVAL(req->out.body, 0x3C, io->out.reserved2);
178         status = smb2_push_o16s16_blob(&req->out, 0x38, io->out.secblob);
179         if (!NT_STATUS_IS_OK(status)) {
180                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
181                 talloc_free(req);
182                 return;
183         }
184
185         smb2srv_send_reply(req);
186 }
187
188 void smb2srv_negprot_recv(struct smb2srv_request *req)
189 {
190         struct smb2_negprot *io;
191         int i;
192         enum ndr_err_code ndr_err;
193
194         if (req->in.body_size < 0x26) {
195                 smb2srv_send_error(req,  NT_STATUS_FOOBAR);
196                 return;
197         }
198
199         io = talloc(req, struct smb2_negprot);
200         if (!io) {
201                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
202                 talloc_free(req);
203                 return;
204         }
205
206         io->in.dialect_count = SVAL(req->in.body, 0x02);
207         io->in.security_mode = SVAL(req->in.body, 0x04);
208         io->in.reserved      = SVAL(req->in.body, 0x06);
209         io->in.capabilities  = IVAL(req->in.body, 0x08);
210         ndr_err = smbcli_pull_guid(req->in.body, 0xC, &io->in.client_guid);
211         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
212                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_FOOBAR));
213                 talloc_free(req);
214                 return;
215         }
216         io->in.start_time = smbcli_pull_nttime(req->in.body, 0x1C);
217
218         io->in.dialects = talloc_array(req, uint16_t, io->in.dialect_count);
219         if (io->in.dialects == NULL) {
220                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
221                 talloc_free(req);
222                 return;
223         }
224         for (i=0;i<io->in.dialect_count;i++) {
225                 io->in.dialects[i] = SVAL(req->in.body, 0x24+i*2);
226         }
227
228         req->status = smb2srv_negprot_backend(req, io);
229
230         if (req->control_flags & SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY) {
231                 talloc_free(req);
232                 return;
233         }
234         smb2srv_negprot_send(req, io);
235 }
236
237 /*
238  * reply to a SMB negprot request with dialect "SMB 2.002"
239  */
240 void smb2srv_reply_smb_negprot(struct smbsrv_request *smb_req)
241 {
242         struct smb2srv_request *req;
243         uint32_t body_fixed_size = 0x26;
244
245         req = talloc_zero(smb_req->smb_conn, struct smb2srv_request);
246         if (!req) goto nomem;
247         req->smb_conn           = smb_req->smb_conn;
248         req->request_time       = smb_req->request_time;
249         talloc_steal(req, smb_req);
250
251         req->in.size      = NBT_HDR_SIZE+SMB2_HDR_BODY+body_fixed_size;
252         req->in.allocated = req->in.size;
253         req->in.buffer    = talloc_array(req, uint8_t, req->in.allocated);
254         if (!req->in.buffer) goto nomem;
255         req->in.hdr       = req->in.buffer + NBT_HDR_SIZE;
256         req->in.body      = req->in.hdr + SMB2_HDR_BODY;
257         req->in.body_size = body_fixed_size;
258         req->in.dynamic   = NULL;
259
260         smb2srv_setup_bufinfo(req);
261
262         SIVAL(req->in.hdr, 0,                           SMB2_MAGIC);
263         SSVAL(req->in.hdr, SMB2_HDR_LENGTH,             SMB2_HDR_BODY);
264         SSVAL(req->in.hdr, SMB2_HDR_EPOCH,              0);
265         SIVAL(req->in.hdr, SMB2_HDR_STATUS,             0);
266         SSVAL(req->in.hdr, SMB2_HDR_OPCODE,             SMB2_OP_NEGPROT);
267         SSVAL(req->in.hdr, SMB2_HDR_CREDIT,             0);
268         SIVAL(req->in.hdr, SMB2_HDR_FLAGS,              0);
269         SIVAL(req->in.hdr, SMB2_HDR_NEXT_COMMAND,       0);
270         SBVAL(req->in.hdr, SMB2_HDR_MESSAGE_ID,         0);
271         SIVAL(req->in.hdr, SMB2_HDR_PID,                0);
272         SIVAL(req->in.hdr, SMB2_HDR_TID,                0);
273         SBVAL(req->in.hdr, SMB2_HDR_SESSION_ID,         0);
274         memset(req->in.hdr+SMB2_HDR_SIGNATURE, 0, 16);
275
276         /* this seems to be a bug, they use 0x24 but the length is 0x26 */
277         SSVAL(req->in.body, 0x00, 0x24);
278
279         SSVAL(req->in.body, 0x02, 1);
280         memset(req->in.body+0x04, 0, 32);
281         SSVAL(req->in.body, 0x24, 0);
282
283         smb2srv_negprot_recv(req);
284         return;
285 nomem:
286         smbsrv_terminate_connection(smb_req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
287         talloc_free(req);
288         return;
289 }