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
 104         if (tevent_req_is_in_progress(subreq)) {
 105                 return smbd_smb2_request_pending_queue(req);
 106         }
 107
 108         return NT_STATUS_OK;
 109 }
 110
 111 static void smbd_smb2_request_read_done(struct tevent_req *subreq)
 112 {
 113         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 114                                         struct smbd_smb2_request);
 115         int i = req->current_idx;
 116         uint8_t *outhdr;
 117         DATA_BLOB outbody;
 118         DATA_BLOB outdyn;
 119         uint8_t out_data_offset;
 120         DATA_BLOB out_data_buffer = data_blob_null;
 121         uint32_t out_data_remaining = 0;
 122         NTSTATUS status;
 123         NTSTATUS error; /* transport error */
 124
 125         status = smbd_smb2_read_recv(subreq,
 126                                      req,
 127                                      &out_data_buffer,
 128                                      &out_data_remaining);
 129         TALLOC_FREE(subreq);
 130         if (!NT_STATUS_IS_OK(status)) {
 131                 error = smbd_smb2_request_error(req, status);
 132                 if (!NT_STATUS_IS_OK(error)) {
 133                         smbd_server_connection_terminate(req->conn,
 134                                                          nt_errstr(error));
 135                         return;
 136                 }
 137                 return;
 138         }
 139
 140         out_data_offset = SMB2_HDR_BODY + 0x10;
 141
 142         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 143
 144         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
 145         if (outbody.data == NULL) {
 146                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 147                 if (!NT_STATUS_IS_OK(error)) {
 148                         smbd_server_connection_terminate(req->conn,
 149                                                          nt_errstr(error));
 150                         return;
 151                 }
 152                 return;
 153         }
 154
 155         SSVAL(outbody.data, 0x00, 0x10 + 1);    /* struct size */
 156         SCVAL(outbody.data, 0x02,
 157               out_data_offset);                 /* data offset */
 158         SCVAL(outbody.data, 0x03, 0);           /* reserved */
 159         SIVAL(outbody.data, 0x04,
 160               out_data_buffer.length);          /* data length */
 161         SIVAL(outbody.data, 0x08,
 162               out_data_remaining);              /* data remaining */
 163         SIVAL(outbody.data, 0x0C, 0);           /* reserved */
 164
 165         outdyn = out_data_buffer;
 166
 167         error = smbd_smb2_request_done(req, outbody, &outdyn);
 168         if (!NT_STATUS_IS_OK(error)) {
 169                 smbd_server_connection_terminate(req->conn,
 170                                                  nt_errstr(error));
 171                 return;
 172         }
 173 }
 174
 175 struct smbd_smb2_read_state {
 176         struct smbd_smb2_request *smb2req;
 177         DATA_BLOB out_data;
 178         uint32_t out_remaining;
 179 };
 180
 181 static void smbd_smb2_read_pipe_done(struct tevent_req *subreq);
 182
 183 static struct tevent_req *smbd_smb2_read_send(TALLOC_CTX *mem_ctx,
 184                                               struct tevent_context *ev,
 185                                               struct smbd_smb2_request *smb2req,
 186                                               uint32_t in_smbpid,
 187                                               uint64_t in_file_id_volatile,
 188                                               uint32_t in_length,
 189                                               uint64_t in_offset,
 190                                               uint32_t in_minimum,
 191                                               uint32_t in_remaining)
 192 {
 193         struct tevent_req *req;
 194         struct smbd_smb2_read_state *state;
 195         struct smb_request *smbreq;
 196         connection_struct *conn = smb2req->tcon->compat_conn;
 197         files_struct *fsp;
 198         ssize_t nread = -1;
 199         struct lock_struct lock;
 200
 201         req = tevent_req_create(mem_ctx, &state,
 202                                 struct smbd_smb2_read_state);
 203         if (req == NULL) {
 204                 return NULL;
 205         }
 206         state->smb2req = smb2req;
 207         state->out_data = data_blob_null;
 208         state->out_remaining = 0;
 209
 210         DEBUG(10,("smbd_smb2_read: file_id[0x%016llX]\n",
 211                   (unsigned long long)in_file_id_volatile));
 212
 213         smbreq = smbd_smb2_fake_smb_request(smb2req);
 214         if (tevent_req_nomem(smbreq, req)) {
 215                 return tevent_req_post(req, ev);
 216         }
 217
 218         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 219         if (fsp == NULL) {
 220                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 221                 return tevent_req_post(req, ev);
 222         }
 223         if (conn != fsp->conn) {
 224                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 225                 return tevent_req_post(req, ev);
 226         }
 227         if (smb2req->session->vuid != fsp->vuid) {
 228                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 229                 return tevent_req_post(req, ev);
 230         }
 231
 232         state->out_data = data_blob_talloc(state, NULL, in_length);
 233         if (in_length > 0 && tevent_req_nomem(state->out_data.data, req)) {
 234                 return tevent_req_post(req, ev);
 235         }
 236
 237         if (IS_IPC(smbreq->conn)) {
 238                 struct tevent_req *subreq;
 239
 240                 if (!fsp_is_np(fsp)) {
 241                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 242                         return tevent_req_post(req, ev);
 243                 }
 244
 245                 subreq = np_read_send(state, smbd_event_context(),
 246                                       fsp->fake_file_handle,
 247                                       state->out_data.data,
 248                                       state->out_data.length);
 249                 if (tevent_req_nomem(subreq, req)) {
 250                         return tevent_req_post(req, ev);
 251                 }
 252                 tevent_req_set_callback(subreq,
 253                                         smbd_smb2_read_pipe_done,
 254                                         req);
 255                 return req;
 256         }
 257
 258         if (!CHECK_READ(fsp, smbreq)) {
 259                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 260                 return tevent_req_post(req, ev);
 261         }
 262
 263         init_strict_lock_struct(fsp,
 264                                 in_smbpid,
 265                                 in_offset,
 266                                 in_length,
 267                                 READ_LOCK,
 268                                 &lock);
 269
 270         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
 271                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 272                 return tevent_req_post(req, ev);
 273         }
 274
 275         nread = read_file(fsp,
 276                           (char *)state->out_data.data,
 277                           in_offset,
 278                           in_length);
 279
 280         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 281
 282         if (nread < 0) {
 283                 DEBUG(5,("smbd_smb2_read: read_file[%s] nread[%lld]\n",
 284                          fsp_str_dbg(fsp), (long long)nread));
 285                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 286                 return tevent_req_post(req, ev);
 287         }
 288         if (nread == 0 && in_length != 0) {
 289                 DEBUG(5,("smbd_smb2_read: read_file[%s] end of file\n",
 290                          fsp_str_dbg(fsp)));
 291                 tevent_req_nterror(req, NT_STATUS_END_OF_FILE);
 292                 return tevent_req_post(req, ev);
 293         }
 294
 295         state->out_data.length = nread;
 296         state->out_remaining = 0;
 297         tevent_req_done(req);
 298         return tevent_req_post(req, ev);
 299 }
 300
 301 static void smbd_smb2_read_pipe_done(struct tevent_req *subreq)
 302 {
 303         struct tevent_req *req = tevent_req_callback_data(subreq,
 304                                  struct tevent_req);
 305         struct smbd_smb2_read_state *state = tevent_req_data(req,
 306                                              struct smbd_smb2_read_state);
 307         NTSTATUS status;
 308         ssize_t nread = -1;
 309         bool is_data_outstanding;
 310
 311         status = np_read_recv(subreq, &nread, &is_data_outstanding);
 312         TALLOC_FREE(subreq);
 313         if (!NT_STATUS_IS_OK(status)) {
 314                 tevent_req_nterror(req, status);
 315                 return;
 316         }
 317
 318         if (nread == 0 && state->out_data.length != 0) {
 319                 tevent_req_nterror(req, NT_STATUS_END_OF_FILE);
 320                 return;
 321         }
 322
 323         state->out_data.length = nread;
 324         state->out_remaining = 0;
 325
 326         tevent_req_done(req);
 327 }
 328
 329 static NTSTATUS smbd_smb2_read_recv(struct tevent_req *req,
 330                                     TALLOC_CTX *mem_ctx,
 331                                     DATA_BLOB *out_data,
 332                                     uint32_t *out_remaining)
 333 {
 334         NTSTATUS status;
 335         struct smbd_smb2_read_state *state = tevent_req_data(req,
 336                                              struct smbd_smb2_read_state);
 337
 338         if (tevent_req_is_nterror(req, &status)) {
 339                 tevent_req_received(req);
 340                 return status;
 341         }
 342
 343         *out_data = state->out_data;
 344         talloc_steal(mem_ctx, out_data->data);
 345         *out_remaining = state->out_remaining;
 346
 347         tevent_req_received(req);
 348         return NT_STATUS_OK;
 349 }