source3/smbd/smb2_notify.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 "../libcli/smb/smb_common.h"
  24
  25 static struct tevent_req *smbd_smb2_notify_send(TALLOC_CTX *mem_ctx,
  26                                                 struct tevent_context *ev,
  27                                                 struct smbd_smb2_request *smb2req,
  28                                                 uint16_t in_flags,
  29                                                 uint32_t in_output_buffer_length,
  30                                                 uint64_t in_file_id_volatile,
  31                                                 uint64_t in_completion_filter);
  32 static NTSTATUS smbd_smb2_notify_recv(struct tevent_req *req,
  33                                       TALLOC_CTX *mem_ctx,
  34                                       DATA_BLOB *out_output_buffer);
  35
  36 static void smbd_smb2_request_notify_done(struct tevent_req *subreq);
  37 NTSTATUS smbd_smb2_request_process_notify(struct smbd_smb2_request *req)
  38 {
  39         const uint8_t *inhdr;
  40         const uint8_t *inbody;
  41         int i = req->current_idx;
  42         size_t expected_body_size = 0x20;
  43         size_t body_size;
  44         uint16_t in_flags;
  45         uint32_t in_output_buffer_length;
  46         uint64_t in_file_id_persistent;
  47         uint64_t in_file_id_volatile;
  48         uint64_t in_completion_filter;
  49         struct tevent_req *subreq;
  50
  51         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
  52         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
  53                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  54         }
  55
  56         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  57
  58         body_size = SVAL(inbody, 0x00);
  59         if (body_size != expected_body_size) {
  60                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  61         }
  62
  63         in_flags                = SVAL(inbody, 0x02);
  64         in_output_buffer_length = IVAL(inbody, 0x04);
  65         in_file_id_persistent   = BVAL(inbody, 0x08);
  66         in_file_id_volatile     = BVAL(inbody, 0x10);
  67         in_completion_filter    = IVAL(inbody, 0x18);
  68
  69         /*
  70          * 0x00010000 is what Windows 7 uses,
  71          * Windows 2008 uses 0x00080000
  72          */
  73         if (in_output_buffer_length > 0x00010000) {
  74                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  75         }
  76
  77         if (req->compat_chain_fsp) {
  78                 /* skip check */
  79         } else if (in_file_id_persistent != 0) {
  80                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  81         }
  82
  83         subreq = smbd_smb2_notify_send(req,
  84                                        req->sconn->smb2.event_ctx,
  85                                        req,
  86                                        in_flags,
  87                                        in_output_buffer_length,
  88                                        in_file_id_volatile,
  89                                        in_completion_filter);
  90         if (subreq == NULL) {
  91                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  92         }
  93         tevent_req_set_callback(subreq, smbd_smb2_request_notify_done, req);
  94
  95         return smbd_smb2_request_pending_queue(req, subreq);
  96 }
  97
  98 static void smbd_smb2_request_notify_done(struct tevent_req *subreq)
  99 {
 100         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 101                                         struct smbd_smb2_request);
 102         int i = req->current_idx;
 103         uint8_t *outhdr;
 104         DATA_BLOB outbody;
 105         DATA_BLOB outdyn;
 106         uint16_t out_output_buffer_offset;
 107         DATA_BLOB out_output_buffer = data_blob_null;
 108         NTSTATUS status;
 109         NTSTATUS error; /* transport error */
 110
 111         status = smbd_smb2_notify_recv(subreq,
 112                                        req,
 113                                        &out_output_buffer);
 114         TALLOC_FREE(subreq);
 115         if (!NT_STATUS_IS_OK(status)) {
 116                 error = smbd_smb2_request_error(req, status);
 117                 if (!NT_STATUS_IS_OK(error)) {
 118                         smbd_server_connection_terminate(req->sconn,
 119                                                          nt_errstr(error));
 120                         return;
 121                 }
 122                 return;
 123         }
 124
 125         out_output_buffer_offset = SMB2_HDR_BODY + 0x08;
 126
 127         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 128
 129         outbody = data_blob_talloc(req->out.vector, NULL, 0x08);
 130         if (outbody.data == NULL) {
 131                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 132                 if (!NT_STATUS_IS_OK(error)) {
 133                         smbd_server_connection_terminate(req->sconn,
 134                                                          nt_errstr(error));
 135                         return;
 136                 }
 137                 return;
 138         }
 139
 140         SSVAL(outbody.data, 0x00, 0x08 + 1);    /* struct size */
 141         SSVAL(outbody.data, 0x02,
 142               out_output_buffer_offset);        /* output buffer offset */
 143         SIVAL(outbody.data, 0x04,
 144               out_output_buffer.length);        /* output buffer length */
 145
 146         outdyn = out_output_buffer;
 147
 148         error = smbd_smb2_request_done(req, outbody, &outdyn);
 149         if (!NT_STATUS_IS_OK(error)) {
 150                 smbd_server_connection_terminate(req->sconn,
 151                                                  nt_errstr(error));
 152                 return;
 153         }
 154 }
 155
 156 struct smbd_smb2_notify_state {
 157         struct smbd_smb2_request *smb2req;
 158         struct smb_request *smbreq;
 159         struct tevent_immediate *im;
 160         NTSTATUS status;
 161         DATA_BLOB out_output_buffer;
 162 };
 163
 164 static void smbd_smb2_notify_reply(struct smb_request *smbreq,
 165                                    NTSTATUS error_code,
 166                                    uint8_t *buf, size_t len);
 167 static void smbd_smb2_notify_reply_trigger(struct tevent_context *ctx,
 168                                            struct tevent_immediate *im,
 169                                            void *private_data);
 170 static bool smbd_smb2_notify_cancel(struct tevent_req *req);
 171
 172 static struct tevent_req *smbd_smb2_notify_send(TALLOC_CTX *mem_ctx,
 173                                                 struct tevent_context *ev,
 174                                                 struct smbd_smb2_request *smb2req,
 175                                                 uint16_t in_flags,
 176                                                 uint32_t in_output_buffer_length,
 177                                                 uint64_t in_file_id_volatile,
 178                                                 uint64_t in_completion_filter)
 179 {
 180         struct tevent_req *req;
 181         struct smbd_smb2_notify_state *state;
 182         struct smb_request *smbreq;
 183         connection_struct *conn = smb2req->tcon->compat_conn;
 184         files_struct *fsp;
 185         bool recursive = (in_flags & 0x0001) ? true : false;
 186         NTSTATUS status;
 187
 188         req = tevent_req_create(mem_ctx, &state,
 189                                 struct smbd_smb2_notify_state);
 190         if (req == NULL) {
 191                 return NULL;
 192         }
 193         state->smb2req = smb2req;
 194         state->status = NT_STATUS_INTERNAL_ERROR;
 195         state->out_output_buffer = data_blob_null;
 196         state->im = NULL;
 197
 198         DEBUG(10,("smbd_smb2_notify_send: file_id[0x%016llX]\n",
 199                   (unsigned long long)in_file_id_volatile));
 200
 201         smbreq = smbd_smb2_fake_smb_request(smb2req);
 202         if (tevent_req_nomem(smbreq, req)) {
 203                 return tevent_req_post(req, ev);
 204         }
 205
 206         state->smbreq = smbreq;
 207         smbreq->async_priv = (void *)req;
 208
 209         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 210         if (fsp == NULL) {
 211                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 212                 return tevent_req_post(req, ev);
 213         }
 214         if (conn != fsp->conn) {
 215                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 216                 return tevent_req_post(req, ev);
 217         }
 218         if (smb2req->session->vuid != fsp->vuid) {
 219                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 220                 return tevent_req_post(req, ev);
 221         }
 222
 223         {
 224                 char *filter_string;
 225
 226                 filter_string = notify_filter_string(NULL, in_completion_filter);
 227                 if (tevent_req_nomem(filter_string, req)) {
 228                         return tevent_req_post(req, ev);
 229                 }
 230
 231                 DEBUG(3,("smbd_smb2_notify_send: notify change "
 232                          "called on %s, filter = %s, recursive = %d\n",
 233                          fsp_str_dbg(fsp), filter_string, recursive));
 234
 235                 TALLOC_FREE(filter_string);
 236         }
 237
 238         if ((!fsp->is_directory) || (conn != fsp->conn)) {
 239                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 240                 return tevent_req_post(req, ev);
 241         }
 242
 243         if (fsp->notify == NULL) {
 244
 245                 status = change_notify_create(fsp,
 246                                               in_completion_filter,
 247                                               recursive);
 248                 if (!NT_STATUS_IS_OK(status)) {
 249                         DEBUG(10, ("change_notify_create returned %s\n",
 250                                    nt_errstr(status)));
 251                         tevent_req_nterror(req, status);
 252                         return tevent_req_post(req, ev);
 253                 }
 254         }
 255
 256         if (fsp->notify->num_changes != 0) {
 257
 258                 /*
 259                  * We've got changes pending, respond immediately
 260                  */
 261
 262                 /*
 263                  * TODO: write a torture test to check the filtering behaviour
 264                  * here.
 265                  */
 266
 267                 change_notify_reply(fsp->conn, smbreq,
 268                                     NT_STATUS_OK,
 269                                     in_output_buffer_length,
 270                                     fsp->notify,
 271                                     smbd_smb2_notify_reply);
 272
 273                 /*
 274                  * change_notify_reply() above has independently
 275                  * called tevent_req_done().
 276                  */
 277                 return tevent_req_post(req, ev);
 278         }
 279
 280         state->im = tevent_create_immediate(state);
 281         if (tevent_req_nomem(state->im, req)) {
 282                 return tevent_req_post(req, ev);
 283         }
 284
 285         /*
 286          * No changes pending, queue the request
 287          */
 288
 289         status = change_notify_add_request(smbreq,
 290                         in_output_buffer_length,
 291                         in_completion_filter,
 292                         recursive, fsp,
 293                         smbd_smb2_notify_reply);
 294         if (!NT_STATUS_IS_OK(status)) {
 295                 tevent_req_nterror(req, status);
 296                 return tevent_req_post(req, ev);
 297         }
 298
 299         /* allow this request to be canceled */
 300         tevent_req_set_cancel_fn(req, smbd_smb2_notify_cancel);
 301
 302         return req;
 303 }
 304
 305 static void smbd_smb2_notify_reply(struct smb_request *smbreq,
 306                                    NTSTATUS error_code,
 307                                    uint8_t *buf, size_t len)
 308 {
 309         struct tevent_req *req = talloc_get_type_abort(smbreq->async_priv,
 310                                                        struct tevent_req);
 311         struct smbd_smb2_notify_state *state = tevent_req_data(req,
 312                                                struct smbd_smb2_notify_state);
 313
 314         state->status = error_code;
 315         if (!NT_STATUS_IS_OK(error_code)) {
 316                 /* nothing */
 317         } else if (len == 0) {
 318                 state->status = STATUS_NOTIFY_ENUM_DIR;
 319         } else {
 320                 state->out_output_buffer = data_blob_talloc(state, buf, len);
 321                 if (state->out_output_buffer.data == NULL) {
 322                         state->status = NT_STATUS_NO_MEMORY;
 323                 }
 324         }
 325
 326         if (state->im == NULL) {
 327                 smbd_smb2_notify_reply_trigger(NULL, NULL, req);
 328                 return;
 329         }
 330
 331         /*
 332          * if this is called async, we need to go via an immediate event
 333          * because the caller replies on the smb_request (a child of req
 334          * being arround after calling this function
 335          */
 336         tevent_schedule_immediate(state->im,
 337                                   state->smb2req->sconn->smb2.event_ctx,
 338                                   smbd_smb2_notify_reply_trigger,
 339                                   req);
 340 }
 341
 342 static void smbd_smb2_notify_reply_trigger(struct tevent_context *ctx,
 343                                            struct tevent_immediate *im,
 344                                            void *private_data)
 345 {
 346         struct tevent_req *req = talloc_get_type_abort(private_data,
 347                                                        struct tevent_req);
 348         struct smbd_smb2_notify_state *state = tevent_req_data(req,
 349                                                struct smbd_smb2_notify_state);
 350
 351         if (!NT_STATUS_IS_OK(state->status)) {
 352                 tevent_req_nterror(req, state->status);
 353                 return;
 354         }
 355
 356         tevent_req_done(req);
 357 }
 358
 359 static bool smbd_smb2_notify_cancel(struct tevent_req *req)
 360 {
 361         struct smbd_smb2_notify_state *state = tevent_req_data(req,
 362                                                struct smbd_smb2_notify_state);
 363
 364         smbd_notify_cancel_by_smbreq(state->smb2req->sconn,
 365                                      state->smbreq);
 366
 367         return true;
 368 }
 369
 370 static NTSTATUS smbd_smb2_notify_recv(struct tevent_req *req,
 371                                       TALLOC_CTX *mem_ctx,
 372                                       DATA_BLOB *out_output_buffer)
 373 {
 374         NTSTATUS status;
 375         struct smbd_smb2_notify_state *state = tevent_req_data(req,
 376                                                struct smbd_smb2_notify_state);
 377
 378         if (tevent_req_is_nterror(req, &status)) {
 379                 tevent_req_received(req);
 380                 return status;
 381         }
 382
 383         *out_output_buffer = state->out_output_buffer;
 384         talloc_steal(mem_ctx, out_output_buffer->data);
 385
 386         tevent_req_received(req);
 387         return NT_STATUS_OK;
 388 }