libcli/smb/smb2cli_ioctl.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    smb2 lib
   4    Copyright (C) Stefan Metzmacher 2011
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "system/network.h"
  22 #include "lib/util/tevent_ntstatus.h"
  23 #include "smb_common.h"
  24 #include "smbXcli_base.h"
  25 #include "librpc/ndr/libndr.h"
  26
  27 struct smb2cli_ioctl_state {
  28         uint8_t fixed[0x38];
  29         uint8_t dyn_pad[1];
  30         uint32_t max_input_length;
  31         uint32_t max_output_length;
  32         struct iovec *recv_iov;
  33         DATA_BLOB out_input_buffer;
  34         DATA_BLOB out_output_buffer;
  35 };
  36
  37 static void smb2cli_ioctl_done(struct tevent_req *subreq);
  38
  39 struct tevent_req *smb2cli_ioctl_send(TALLOC_CTX *mem_ctx,
  40                                       struct tevent_context *ev,
  41                                       struct smbXcli_conn *conn,
  42                                       uint32_t timeout_msec,
  43                                       struct smbXcli_session *session,
  44                                       struct smbXcli_tcon *tcon,
  45                                       uint64_t in_fid_persistent,
  46                                       uint64_t in_fid_volatile,
  47                                       uint32_t in_ctl_code,
  48                                       uint32_t in_max_input_length,
  49                                       const DATA_BLOB *in_input_buffer,
  50                                       uint32_t in_max_output_length,
  51                                       const DATA_BLOB *in_output_buffer,
  52                                       uint32_t in_flags)
  53 {
  54         struct tevent_req *req, *subreq;
  55         struct smb2cli_ioctl_state *state;
  56         uint8_t *fixed;
  57         uint8_t *dyn;
  58         size_t dyn_len;
  59         uint32_t input_buffer_offset = 0;
  60         uint32_t input_buffer_length = 0;
  61         uint32_t output_buffer_offset = 0;
  62         uint32_t output_buffer_length = 0;
  63         uint32_t pad_length = 0;
  64
  65         req = tevent_req_create(mem_ctx, &state,
  66                                 struct smb2cli_ioctl_state);
  67         if (req == NULL) {
  68                 return NULL;
  69         }
  70         state->max_input_length = in_max_input_length;
  71         state->max_output_length = in_max_output_length;
  72
  73         if (in_input_buffer) {
  74                 input_buffer_offset = SMB2_HDR_BODY+0x38;
  75                 input_buffer_length = in_input_buffer->length;
  76         }
  77
  78         if (in_output_buffer) {
  79                 output_buffer_offset = SMB2_HDR_BODY+0x38;
  80                 if (input_buffer_length > 0 && output_buffer_length > 0) {
  81                         uint32_t tmp;
  82                         output_buffer_offset += input_buffer_length;
  83                         tmp = output_buffer_offset;
  84                         output_buffer_offset = NDR_ROUND(output_buffer_offset, 8);
  85                         pad_length = output_buffer_offset - tmp;
  86                 }
  87                 output_buffer_length = in_output_buffer->length;
  88         }
  89
  90         fixed = state->fixed;
  91
  92         SSVAL(fixed, 0x00, 0x39);
  93         SSVAL(fixed, 0x02, 0); /* reserved */
  94         SIVAL(fixed, 0x04, in_ctl_code);
  95         SBVAL(fixed, 0x08, in_fid_persistent);
  96         SBVAL(fixed, 0x10, in_fid_volatile);
  97         SIVAL(fixed, 0x18, input_buffer_offset);
  98         SIVAL(fixed, 0x1C, input_buffer_length);
  99         SIVAL(fixed, 0x20, in_max_input_length);
 100         SIVAL(fixed, 0x24, output_buffer_offset);
 101         SIVAL(fixed, 0x28, output_buffer_length);
 102         SIVAL(fixed, 0x2C, in_max_output_length);
 103         SIVAL(fixed, 0x30, in_flags);
 104         SIVAL(fixed, 0x34, 0); /* reserved */
 105
 106         if (input_buffer_length > 0 && output_buffer_length > 0) {
 107                 size_t avail = UINT32_MAX - (input_buffer_length + pad_length);
 108                 size_t ofs = output_buffer_offset - input_buffer_offset;
 109
 110                 if (avail < output_buffer_length) {
 111                         tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
 112                         return tevent_req_post(req, ev);
 113                 }
 114
 115                 dyn_len = input_buffer_length + output_buffer_length + pad_length;
 116
 117                 dyn = talloc_zero_array(state, uint8_t, dyn_len);
 118                 if (tevent_req_nomem(dyn, req)) {
 119                         return tevent_req_post(req, ev);
 120                 }
 121                 memcpy(dyn, in_input_buffer->data,
 122                        in_input_buffer->length);
 123                 memcpy(dyn + ofs, in_output_buffer->data,
 124                        in_output_buffer->length);
 125         } else if (input_buffer_length > 0) {
 126                 dyn = in_input_buffer->data;
 127                 dyn_len = in_input_buffer->length;
 128         } else if (output_buffer_length > 0) {
 129                 dyn = in_output_buffer->data;
 130                 dyn_len = in_output_buffer->length;
 131         } else {
 132                 dyn = state->dyn_pad;
 133                 dyn_len = sizeof(state->dyn_pad);
 134         }
 135
 136         subreq = smb2cli_req_send(state, ev, conn, SMB2_OP_IOCTL,
 137                                   0, 0, /* flags */
 138                                   timeout_msec,
 139                                   tcon,
 140                                   session,
 141                                   state->fixed, sizeof(state->fixed),
 142                                   dyn, dyn_len);
 143         if (tevent_req_nomem(subreq, req)) {
 144                 return tevent_req_post(req, ev);
 145         }
 146         tevent_req_set_callback(subreq, smb2cli_ioctl_done, req);
 147         return req;
 148 }
 149
 150 static void smb2cli_ioctl_done(struct tevent_req *subreq)
 151 {
 152         struct tevent_req *req =
 153                 tevent_req_callback_data(subreq,
 154                 struct tevent_req);
 155         struct smb2cli_ioctl_state *state =
 156                 tevent_req_data(req,
 157                 struct smb2cli_ioctl_state);
 158         NTSTATUS status;
 159         struct iovec *iov;
 160         uint8_t *fixed;
 161         uint8_t *dyn;
 162         size_t dyn_len;
 163         uint32_t dyn_ofs = SMB2_HDR_BODY + 0x30;
 164         uint32_t input_buffer_offset;
 165         uint32_t input_buffer_length;
 166         uint32_t output_buffer_offset;
 167         uint32_t output_buffer_length;
 168         static const struct smb2cli_req_expected_response expected[] = {
 169         {
 170                 .status = NT_STATUS_OK,
 171                 .body_size = 0x31
 172         },
 173         {
 174                 .status = STATUS_BUFFER_OVERFLOW,
 175                 .body_size = 0x31
 176         }
 177         };
 178
 179         status = smb2cli_req_recv(subreq, state, &iov,
 180                                   expected, ARRAY_SIZE(expected));
 181         if (tevent_req_nterror(req, status)) {
 182                 return;
 183         }
 184
 185         state->recv_iov = iov;
 186         fixed = (uint8_t *)iov[1].iov_base;
 187         dyn = (uint8_t *)iov[2].iov_base;
 188         dyn_len = iov[2].iov_len;
 189
 190         input_buffer_offset = IVAL(fixed, 0x18);
 191         input_buffer_length = IVAL(fixed, 0x1C);
 192         output_buffer_offset = IVAL(fixed, 0x20);
 193         output_buffer_length = IVAL(fixed, 0x24);
 194
 195         if ((input_buffer_offset > 0) && (input_buffer_length > 0)) {
 196                 uint32_t ofs;
 197
 198                 if (input_buffer_offset != dyn_ofs) {
 199                         tevent_req_nterror(
 200                                 req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 201                         return;
 202                 }
 203
 204                 if (input_buffer_length < dyn_len) {
 205                         tevent_req_nterror(
 206                                 req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 207                         return;
 208                 }
 209
 210                 if (input_buffer_length > state->max_input_length) {
 211                         tevent_req_nterror(
 212                                 req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 213                         return;
 214                 }
 215
 216                 state->out_input_buffer.data = dyn;
 217                 state->out_input_buffer.length = input_buffer_length;
 218
 219                 ofs = input_buffer_length;
 220                 ofs = NDR_ROUND(ofs, 8);
 221
 222                 dyn_ofs += ofs;
 223                 dyn += ofs;
 224                 dyn_len -= ofs;
 225         }
 226
 227         if ((output_buffer_offset > 0) && (output_buffer_length > 0)) {
 228                 if (output_buffer_offset != dyn_ofs) {
 229                         tevent_req_nterror(
 230                                 req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 231                         return;
 232                 }
 233
 234                 if (output_buffer_length < dyn_len) {
 235                         tevent_req_nterror(
 236                                 req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 237                         return;
 238                 }
 239
 240                 if (output_buffer_length > state->max_output_length) {
 241                         tevent_req_nterror(
 242                                 req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 243                         return;
 244                 }
 245
 246                 state->out_output_buffer.data = dyn;
 247                 state->out_output_buffer.length = output_buffer_length;
 248         }
 249
 250         tevent_req_done(req);
 251 }
 252
 253 NTSTATUS smb2cli_ioctl_recv(struct tevent_req *req,
 254                             TALLOC_CTX *mem_ctx,
 255                             DATA_BLOB *out_input_buffer,
 256                             DATA_BLOB *out_output_buffer)
 257 {
 258         struct smb2cli_ioctl_state *state =
 259                 tevent_req_data(req,
 260                 struct smb2cli_ioctl_state);
 261         NTSTATUS status;
 262
 263         if (tevent_req_is_nterror(req, &status)) {
 264                 tevent_req_received(req);
 265                 return status;
 266         }
 267
 268         talloc_steal(mem_ctx, state->recv_iov);
 269         if (out_input_buffer) {
 270                 *out_input_buffer = state->out_input_buffer;
 271         }
 272         if (out_output_buffer) {
 273                 *out_output_buffer = state->out_output_buffer;
 274         }
 275
 276         tevent_req_received(req);
 277         return NT_STATUS_OK;
 278 }
 279
 280 NTSTATUS smb2cli_ioctl(struct smbXcli_conn *conn,
 281                        uint32_t timeout_msec,
 282                        struct smbXcli_session *session,
 283                        struct smbXcli_tcon *tcon,
 284                        uint64_t in_fid_persistent,
 285                        uint64_t in_fid_volatile,
 286                        uint32_t in_ctl_code,
 287                        uint32_t in_max_input_length,
 288                        const DATA_BLOB *in_input_buffer,
 289                        uint32_t in_max_output_length,
 290                        const DATA_BLOB *in_output_buffer,
 291                        uint32_t in_flags,
 292                        TALLOC_CTX *mem_ctx,
 293                        DATA_BLOB *out_input_buffer,
 294                        DATA_BLOB *out_output_buffer)
 295 {
 296         TALLOC_CTX *frame = talloc_stackframe();
 297         struct tevent_context *ev;
 298         struct tevent_req *req;
 299         NTSTATUS status = NT_STATUS_NO_MEMORY;
 300
 301         if (smbXcli_conn_has_async_calls(conn)) {
 302                 /*
 303                  * Can't use sync call while an async call is in flight
 304                  */
 305                 status = NT_STATUS_INVALID_PARAMETER_MIX;
 306                 goto fail;
 307         }
 308         ev = tevent_context_init(frame);
 309         if (ev == NULL) {
 310                 goto fail;
 311         }
 312         req = smb2cli_ioctl_send(frame, ev, conn, timeout_msec,
 313                                  session, tcon,
 314                                  in_fid_persistent,
 315                                  in_fid_volatile,
 316                                  in_ctl_code,
 317                                  in_max_input_length,
 318                                  in_input_buffer,
 319                                  in_max_output_length,
 320                                  in_output_buffer,
 321                                  in_flags);
 322         if (req == NULL) {
 323                 goto fail;
 324         }
 325         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 326                 goto fail;
 327         }
 328         status = smb2cli_ioctl_recv(req, mem_ctx,
 329                                     out_input_buffer,
 330                                     out_output_buffer);
 331  fail:
 332         TALLOC_FREE(frame);
 333         return status;
 334 }