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