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                 output_buffer_length = in_output_buffer->length;
  81                 if (input_buffer_length > 0 && output_buffer_length > 0) {
  82                         uint32_t tmp;
  83                         output_buffer_offset += input_buffer_length;
  84                         tmp = output_buffer_offset;
  85                         output_buffer_offset = NDR_ROUND(output_buffer_offset, 8);
  86                         pad_length = output_buffer_offset - tmp;
  87                 }
  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         TALLOC_FREE(subreq);
 182         if (tevent_req_nterror(req, status)) {
 183                 return;
 184         }
 185
 186         state->recv_iov = iov;
 187         fixed = (uint8_t *)iov[1].iov_base;
 188         dyn = (uint8_t *)iov[2].iov_base;
 189         dyn_len = iov[2].iov_len;
 190
 191         input_buffer_offset = IVAL(fixed, 0x18);
 192         input_buffer_length = IVAL(fixed, 0x1C);
 193         output_buffer_offset = IVAL(fixed, 0x20);
 194         output_buffer_length = IVAL(fixed, 0x24);
 195
 196         if ((input_buffer_offset > 0) && (input_buffer_length > 0)) {
 197                 uint32_t ofs;
 198
 199                 if (input_buffer_offset != dyn_ofs) {
 200                         tevent_req_nterror(
 201                                 req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 202                         return;
 203                 }
 204
 205                 if (input_buffer_length < dyn_len) {
 206                         tevent_req_nterror(
 207                                 req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 208                         return;
 209                 }
 210
 211                 if (input_buffer_length > state->max_input_length) {
 212                         tevent_req_nterror(
 213                                 req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 214                         return;
 215                 }
 216
 217                 state->out_input_buffer.data = dyn;
 218                 state->out_input_buffer.length = input_buffer_length;
 219
 220                 ofs = input_buffer_length;
 221                 ofs = NDR_ROUND(ofs, 8);
 222
 223                 dyn_ofs += ofs;
 224                 dyn += ofs;
 225                 dyn_len -= ofs;
 226         }
 227
 228         if ((output_buffer_offset > 0) && (output_buffer_length > 0)) {
 229                 if (output_buffer_offset != dyn_ofs) {
 230                         tevent_req_nterror(
 231                                 req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 232                         return;
 233                 }
 234
 235                 if (output_buffer_length < dyn_len) {
 236                         tevent_req_nterror(
 237                                 req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 238                         return;
 239                 }
 240
 241                 if (output_buffer_length > state->max_output_length) {
 242                         tevent_req_nterror(
 243                                 req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 244                         return;
 245                 }
 246
 247                 state->out_output_buffer.data = dyn;
 248                 state->out_output_buffer.length = output_buffer_length;
 249         }
 250
 251         tevent_req_done(req);
 252 }
 253
 254 NTSTATUS smb2cli_ioctl_recv(struct tevent_req *req,
 255                             TALLOC_CTX *mem_ctx,
 256                             DATA_BLOB *out_input_buffer,
 257                             DATA_BLOB *out_output_buffer)
 258 {
 259         struct smb2cli_ioctl_state *state =
 260                 tevent_req_data(req,
 261                 struct smb2cli_ioctl_state);
 262         NTSTATUS status;
 263
 264         if (tevent_req_is_nterror(req, &status)) {
 265                 tevent_req_received(req);
 266                 return status;
 267         }
 268
 269         talloc_steal(mem_ctx, state->recv_iov);
 270         if (out_input_buffer) {
 271                 *out_input_buffer = state->out_input_buffer;
 272         }
 273         if (out_output_buffer) {
 274                 *out_output_buffer = state->out_output_buffer;
 275         }
 276
 277         tevent_req_received(req);
 278         return NT_STATUS_OK;
 279 }
 280
 281 NTSTATUS smb2cli_ioctl(struct smbXcli_conn *conn,
 282                        uint32_t timeout_msec,
 283                        struct smbXcli_session *session,
 284                        struct smbXcli_tcon *tcon,
 285                        uint64_t in_fid_persistent,
 286                        uint64_t in_fid_volatile,
 287                        uint32_t in_ctl_code,
 288                        uint32_t in_max_input_length,
 289                        const DATA_BLOB *in_input_buffer,
 290                        uint32_t in_max_output_length,
 291                        const DATA_BLOB *in_output_buffer,
 292                        uint32_t in_flags,
 293                        TALLOC_CTX *mem_ctx,
 294                        DATA_BLOB *out_input_buffer,
 295                        DATA_BLOB *out_output_buffer)
 296 {
 297         TALLOC_CTX *frame = talloc_stackframe();
 298         struct tevent_context *ev;
 299         struct tevent_req *req;
 300         NTSTATUS status = NT_STATUS_NO_MEMORY;
 301
 302         if (smbXcli_conn_has_async_calls(conn)) {
 303                 /*
 304                  * Can't use sync call while an async call is in flight
 305                  */
 306                 status = NT_STATUS_INVALID_PARAMETER_MIX;
 307                 goto fail;
 308         }
 309         ev = samba_tevent_context_init(frame);
 310         if (ev == NULL) {
 311                 goto fail;
 312         }
 313         req = smb2cli_ioctl_send(frame, ev, conn, timeout_msec,
 314                                  session, tcon,
 315                                  in_fid_persistent,
 316                                  in_fid_volatile,
 317                                  in_ctl_code,
 318                                  in_max_input_length,
 319                                  in_input_buffer,
 320                                  in_max_output_length,
 321                                  in_output_buffer,
 322                                  in_flags);
 323         if (req == NULL) {
 324                 goto fail;
 325         }
 326         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 327                 goto fail;
 328         }
 329         status = smb2cli_ioctl_recv(req, mem_ctx,
 330                                     out_input_buffer,
 331                                     out_output_buffer);
 332  fail:
 333         TALLOC_FREE(frame);
 334         return status;
 335 }