source3/smbd/smb2_read.c

   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 "../source4/libcli/smb2/smb2_constants.h"
  24
  25 static struct tevent_req *smbd_smb2_read_send(TALLOC_CTX *mem_ctx,
  26                                               struct tevent_context *ev,
  27                                               struct smbd_smb2_request *smb2req,
  28                                               uint32_t in_smbpid,
  29                                               uint64_t in_file_id_volatile,
  30                                               uint32_t in_length,
  31                                               uint64_t in_offset,
  32                                               uint32_t in_minimum,
  33                                               uint32_t in_remaining);
  34 static NTSTATUS smbd_smb2_read_recv(struct tevent_req *req,
  35                                     TALLOC_CTX *mem_ctx,
  36                                     DATA_BLOB *out_data,
  37                                     uint32_t *out_remaining);
  38
  39 static void smbd_smb2_request_read_done(struct tevent_req *subreq);
  40 NTSTATUS smbd_smb2_request_process_read(struct smbd_smb2_request *req)
  41 {
  42         const uint8_t *inhdr;
  43         const uint8_t *inbody;
  44         int i = req->current_idx;
  45         size_t expected_body_size = 0x31;
  46         size_t body_size;
  47         uint32_t in_smbpid;
  48         uint32_t in_length;
  49         uint64_t in_offset;
  50         uint64_t in_file_id_persistent;
  51         uint64_t in_file_id_volatile;
  52         uint32_t in_minimum_count;
  53         uint32_t in_remaining_bytes;
  54         struct tevent_req *subreq;
  55
  56         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
  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_smbpid = IVAL(inhdr, SMB2_HDR_PID);
  69
  70         in_length               = IVAL(inbody, 0x04);
  71         in_offset               = BVAL(inbody, 0x08);
  72         in_file_id_persistent   = BVAL(inbody, 0x10);
  73         in_file_id_volatile     = BVAL(inbody, 0x18);
  74         in_minimum_count        = IVAL(inbody, 0x20);
  75         in_remaining_bytes      = IVAL(inbody, 0x28);
  76
  77         /* check the max read size */
  78         if (in_length > 0x00010000) {
  79                 DEBUG(0,("here:%s: 0x%08X: 0x%08X\n",
  80                         __location__, in_length, 0x00010000));
  81                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  82         }
  83
  84         if (req->compat_chain_fsp) {
  85                 /* skip check */
  86         } else if (in_file_id_persistent != 0) {
  87                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  88         }
  89
  90         subreq = smbd_smb2_read_send(req,
  91                                      req->conn->smb2.event_ctx,
  92                                      req,
  93                                      in_smbpid,
  94                                      in_file_id_volatile,
  95                                      in_length,
  96                                      in_offset,
  97                                      in_minimum_count,
  98                                      in_remaining_bytes);
  99         if (subreq == NULL) {
 100                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 101         }
 102         tevent_req_set_callback(subreq, smbd_smb2_request_read_done, req);
 103         return NT_STATUS_OK;
 104 }
 105
 106 static void smbd_smb2_request_read_done(struct tevent_req *subreq)
 107 {
 108         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 109                                         struct smbd_smb2_request);
 110         int i = req->current_idx;
 111         uint8_t *outhdr;
 112         DATA_BLOB outbody;
 113         DATA_BLOB outdyn;
 114         uint8_t out_data_offset;
 115         DATA_BLOB out_data_buffer;
 116         uint32_t out_data_remaining;
 117         NTSTATUS status;
 118         NTSTATUS error; /* transport error */
 119
 120         status = smbd_smb2_read_recv(subreq,
 121                                      req,
 122                                      &out_data_buffer,
 123                                      &out_data_remaining);
 124         TALLOC_FREE(subreq);
 125         if (!NT_STATUS_IS_OK(status)) {
 126                 error = smbd_smb2_request_error(req, status);
 127                 if (!NT_STATUS_IS_OK(error)) {
 128                         smbd_server_connection_terminate(req->conn,
 129                                                          nt_errstr(error));
 130                         return;
 131                 }
 132                 return;
 133         }
 134
 135         out_data_offset = SMB2_HDR_BODY + 0x10;
 136
 137         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 138
 139         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
 140         if (outbody.data == NULL) {
 141                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 142                 if (!NT_STATUS_IS_OK(error)) {
 143                         smbd_server_connection_terminate(req->conn,
 144                                                          nt_errstr(error));
 145                         return;
 146                 }
 147                 return;
 148         }
 149
 150         SSVAL(outbody.data, 0x00, 0x10 + 1);    /* struct size */
 151         SCVAL(outbody.data, 0x02,
 152               out_data_offset);                 /* data offset */
 153         SCVAL(outbody.data, 0x03, 0);           /* reserved */
 154         SIVAL(outbody.data, 0x04,
 155               out_data_buffer.length);          /* data length */
 156         SIVAL(outbody.data, 0x08,
 157               out_data_remaining);              /* data remaining */
 158         SIVAL(outbody.data, 0x0C, 0);           /* reserved */
 159
 160         outdyn = out_data_buffer;
 161
 162         error = smbd_smb2_request_done(req, outbody, &outdyn);
 163         if (!NT_STATUS_IS_OK(error)) {
 164                 smbd_server_connection_terminate(req->conn,
 165                                                  nt_errstr(error));
 166                 return;
 167         }
 168 }
 169
 170 struct smbd_smb2_read_state {
 171         struct smbd_smb2_request *smb2req;
 172         DATA_BLOB out_data;
 173         uint32_t out_remaining;
 174 };
 175
 176 static void smbd_smb2_read_pipe_done(struct tevent_req *subreq);
 177
 178 static struct tevent_req *smbd_smb2_read_send(TALLOC_CTX *mem_ctx,
 179                                               struct tevent_context *ev,
 180                                               struct smbd_smb2_request *smb2req,
 181                                               uint32_t in_smbpid,
 182                                               uint64_t in_file_id_volatile,
 183                                               uint32_t in_length,
 184                                               uint64_t in_offset,
 185                                               uint32_t in_minimum,
 186                                               uint32_t in_remaining)
 187 {
 188         struct tevent_req *req;
 189         struct smbd_smb2_read_state *state;
 190         struct smb_request *smbreq;
 191         connection_struct *conn = smb2req->tcon->compat_conn;
 192         files_struct *fsp;
 193         ssize_t nread = -1;
 194         struct lock_struct lock;
 195
 196         req = tevent_req_create(mem_ctx, &state,
 197                                 struct smbd_smb2_read_state);
 198         if (req == NULL) {
 199                 return NULL;
 200         }
 201         state->smb2req = smb2req;
 202         state->out_data = data_blob_null;
 203         state->out_remaining = 0;
 204
 205         DEBUG(10,("smbd_smb2_read: file_id[0x%016llX]\n",
 206                   (unsigned long long)in_file_id_volatile));
 207
 208         smbreq = smbd_smb2_fake_smb_request(smb2req);
 209         if (tevent_req_nomem(smbreq, req)) {
 210                 return tevent_req_post(req, ev);
 211         }
 212
 213         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 214         if (fsp == NULL) {
 215                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 216                 return tevent_req_post(req, ev);
 217         }
 218         if (conn != fsp->conn) {
 219                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 220                 return tevent_req_post(req, ev);
 221         }
 222         if (smb2req->session->vuid != fsp->vuid) {
 223                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 224                 return tevent_req_post(req, ev);
 225         }
 226
 227         state->out_data = data_blob_talloc(state, NULL, in_length);
 228         if (in_length > 0 && tevent_req_nomem(state->out_data.data, req)) {
 229                 return tevent_req_post(req, ev);
 230         }
 231
 232         if (IS_IPC(smbreq->conn)) {
 233                 struct tevent_req *subreq;
 234
 235                 if (!fsp_is_np(fsp)) {
 236                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 237                         return tevent_req_post(req, ev);
 238                 }
 239
 240                 subreq = np_read_send(state, smbd_event_context(),
 241                                       fsp->fake_file_handle,
 242                                       state->out_data.data,
 243                                       state->out_data.length);
 244                 if (tevent_req_nomem(subreq, req)) {
 245                         return tevent_req_post(req, ev);
 246                 }
 247                 tevent_req_set_callback(subreq,
 248                                         smbd_smb2_read_pipe_done,
 249                                         req);
 250                 return req;
 251         }
 252
 253         if (!CHECK_READ(fsp, smbreq)) {
 254                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 255                 return tevent_req_post(req, ev);
 256         }
 257
 258         init_strict_lock_struct(fsp,
 259                                 in_smbpid,
 260                                 in_offset,
 261                                 in_length,
 262                                 READ_LOCK,
 263                                 &lock);
 264
 265         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
 266                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 267                 return tevent_req_post(req, ev);
 268         }
 269
 270         nread = read_file(fsp,
 271                           (char *)state->out_data.data,
 272                           in_offset,
 273                           in_length);
 274
 275         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 276
 277         if (nread < 0) {
 278                 DEBUG(5,("smbd_smb2_read: read_file[%s] nread[%lld]\n",
 279                         fsp->fsp_name, (long long)nread));
 280                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 281                 return tevent_req_post(req, ev);
 282         }
 283         if (nread == 0 && in_length != 0) {
 284                 DEBUG(5,("smbd_smb2_read: read_file[%s] end of file\n",
 285                         fsp->fsp_name));
 286                 tevent_req_nterror(req, NT_STATUS_END_OF_FILE);
 287                 return tevent_req_post(req, ev);
 288         }
 289
 290         state->out_data.length = nread;
 291         state->out_remaining = 0;
 292         tevent_req_done(req);
 293         return tevent_req_post(req, ev);
 294 }
 295
 296 static void smbd_smb2_read_pipe_done(struct tevent_req *subreq)
 297 {
 298         struct tevent_req *req = tevent_req_callback_data(subreq,
 299                                  struct tevent_req);
 300         struct smbd_smb2_read_state *state = tevent_req_data(req,
 301                                              struct smbd_smb2_read_state);
 302         NTSTATUS status;
 303         ssize_t nread = -1;
 304         bool is_data_outstanding;
 305
 306         status = np_read_recv(subreq, &nread, &is_data_outstanding);
 307         TALLOC_FREE(subreq);
 308         if (!NT_STATUS_IS_OK(status)) {
 309                 tevent_req_nterror(req, status);
 310                 return;
 311         }
 312
 313         if (nread == 0 && state->out_data.length != 0) {
 314                 tevent_req_nterror(req, NT_STATUS_END_OF_FILE);
 315                 return;
 316         }
 317
 318         state->out_data.length = nread;
 319         state->out_remaining = 0;
 320
 321         tevent_req_done(req);
 322 }
 323
 324 static NTSTATUS smbd_smb2_read_recv(struct tevent_req *req,
 325                                     TALLOC_CTX *mem_ctx,
 326                                     DATA_BLOB *out_data,
 327                                     uint32_t *out_remaining)
 328 {
 329         NTSTATUS status;
 330         struct smbd_smb2_read_state *state = tevent_req_data(req,
 331                                              struct smbd_smb2_read_state);
 332
 333         if (tevent_req_is_nterror(req, &status)) {
 334                 tevent_req_received(req);
 335                 return status;
 336         }
 337
 338         *out_data = state->out_data;
 339         talloc_steal(mem_ctx, out_data->data);
 340         *out_remaining = state->out_remaining;
 341
 342         tevent_req_received(req);
 343         return NT_STATUS_OK;
 344 }