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 "../source4/libcli/smb2/smb2_constants.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         if (tevent_req_is_in_progress(subreq)) {
  96                 return smbd_smb2_request_pending_queue(req);
  97         }
  98
  99         return NT_STATUS_OK;
 100 }
 101
 102 static void smbd_smb2_request_notify_done(struct tevent_req *subreq)
 103 {
 104         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 105                                         struct smbd_smb2_request);
 106         int i = req->current_idx;
 107         uint8_t *outhdr;
 108         DATA_BLOB outbody;
 109         DATA_BLOB outdyn;
 110         uint16_t out_output_buffer_offset;
 111         DATA_BLOB out_output_buffer = data_blob_null;
 112         NTSTATUS status;
 113         NTSTATUS error; /* transport error */
 114
 115         status = smbd_smb2_notify_recv(subreq,
 116                                        req,
 117                                        &out_output_buffer);
 118         TALLOC_FREE(subreq);
 119         if (!NT_STATUS_IS_OK(status)) {
 120                 error = smbd_smb2_request_error(req, status);
 121                 if (!NT_STATUS_IS_OK(error)) {
 122                         smbd_server_connection_terminate(req->sconn,
 123                                                          nt_errstr(error));
 124                         return;
 125                 }
 126                 return;
 127         }
 128
 129         out_output_buffer_offset = SMB2_HDR_BODY + 0x08;
 130
 131         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 132
 133         outbody = data_blob_talloc(req->out.vector, NULL, 0x08);
 134         if (outbody.data == NULL) {
 135                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 136                 if (!NT_STATUS_IS_OK(error)) {
 137                         smbd_server_connection_terminate(req->sconn,
 138                                                          nt_errstr(error));
 139                         return;
 140                 }
 141                 return;
 142         }
 143
 144         SSVAL(outbody.data, 0x00, 0x08 + 1);    /* struct size */
 145         SSVAL(outbody.data, 0x02,
 146               out_output_buffer_offset);        /* output buffer offset */
 147         SIVAL(outbody.data, 0x04,
 148               out_output_buffer.length);        /* output buffer length */
 149
 150         outdyn = out_output_buffer;
 151
 152         error = smbd_smb2_request_done(req, outbody, &outdyn);
 153         if (!NT_STATUS_IS_OK(error)) {
 154                 smbd_server_connection_terminate(req->sconn,
 155                                                  nt_errstr(error));
 156                 return;
 157         }
 158 }
 159
 160 struct smbd_smb2_notify_state {
 161         struct smbd_smb2_request *smb2req;
 162         struct tevent_immediate *im;
 163         NTSTATUS status;
 164         DATA_BLOB out_output_buffer;
 165 };
 166
 167 static void smbd_smb2_notify_reply(struct smb_request *smbreq,
 168                                    NTSTATUS error_code,
 169                                    uint8_t *buf, size_t len);
 170 static void smbd_smb2_notify_reply_trigger(struct tevent_context *ctx,
 171                                            struct tevent_immediate *im,
 172                                            void *private_data);
 173
 174 static struct tevent_req *smbd_smb2_notify_send(TALLOC_CTX *mem_ctx,
 175                                                 struct tevent_context *ev,
 176                                                 struct smbd_smb2_request *smb2req,
 177                                                 uint16_t in_flags,
 178                                                 uint32_t in_output_buffer_length,
 179                                                 uint64_t in_file_id_volatile,
 180                                                 uint64_t in_completion_filter)
 181 {
 182         struct tevent_req *req;
 183         struct smbd_smb2_notify_state *state;
 184         struct smb_request *smbreq;
 185         connection_struct *conn = smb2req->tcon->compat_conn;
 186         files_struct *fsp;
 187         bool recursive = (in_flags & 0x0001) ? true : false;
 188         NTSTATUS status;
 189
 190         req = tevent_req_create(mem_ctx, &state,
 191                                 struct smbd_smb2_notify_state);
 192         if (req == NULL) {
 193                 return NULL;
 194         }
 195         state->smb2req = smb2req;
 196         state->status = NT_STATUS_INTERNAL_ERROR;
 197         state->out_output_buffer = data_blob_null;
 198         state->im = NULL;
 199
 200         DEBUG(10,("smbd_smb2_notify_send: file_id[0x%016llX]\n",
 201                   (unsigned long long)in_file_id_volatile));
 202
 203         smbreq = smbd_smb2_fake_smb_request(smb2req);
 204         if (tevent_req_nomem(smbreq, req)) {
 205                 return tevent_req_post(req, ev);
 206         }
 207
 208         smbreq->async_priv = (void *)req;
 209
 210         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 211         if (fsp == NULL) {
 212                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 213                 return tevent_req_post(req, ev);
 214         }
 215         if (conn != fsp->conn) {
 216                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 217                 return tevent_req_post(req, ev);
 218         }
 219         if (smb2req->session->vuid != fsp->vuid) {
 220                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 221                 return tevent_req_post(req, ev);
 222         }
 223
 224         {
 225                 char *filter_string;
 226
 227                 filter_string = notify_filter_string(NULL, in_completion_filter);
 228                 if (tevent_req_nomem(filter_string, req)) {
 229                         return tevent_req_post(req, ev);
 230                 }
 231
 232                 DEBUG(3,("smbd_smb2_notify_send: notify change "
 233                          "called on %s, filter = %s, recursive = %d\n",
 234                          fsp_str_dbg(fsp), filter_string, recursive));
 235
 236                 TALLOC_FREE(filter_string);
 237         }
 238
 239         if ((!fsp->is_directory) || (conn != fsp->conn)) {
 240                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 241                 return tevent_req_post(req, ev);
 242         }
 243
 244         if (fsp->notify == NULL) {
 245
 246                 status = change_notify_create(fsp,
 247                                               in_completion_filter,
 248                                               recursive);
 249                 if (!NT_STATUS_IS_OK(status)) {
 250                         DEBUG(10, ("change_notify_create returned %s\n",
 251                                    nt_errstr(status)));
 252                         tevent_req_nterror(req, status);
 253                         return tevent_req_post(req, ev);
 254                 }
 255         }
 256
 257         if (fsp->notify->num_changes != 0) {
 258
 259                 /*
 260                  * We've got changes pending, respond immediately
 261                  */
 262
 263                 /*
 264                  * TODO: write a torture test to check the filtering behaviour
 265                  * here.
 266                  */
 267
 268                 change_notify_reply(fsp->conn, smbreq,
 269                                     NT_STATUS_OK,
 270                                     in_output_buffer_length,
 271                                     fsp->notify,
 272                                     smbd_smb2_notify_reply);
 273
 274                 /*
 275                  * change_notify_reply() above has independently
 276                  * called tevent_req_done().
 277                  */
 278                 return tevent_req_post(req, ev);
 279         }
 280
 281         state->im = tevent_create_immediate(state);
 282         if (tevent_req_nomem(state->im, req)) {
 283                 return tevent_req_post(req, ev);
 284         }
 285
 286         /*
 287          * No changes pending, queue the request
 288          */
 289
 290         status = change_notify_add_request(smbreq,
 291                         in_output_buffer_length,
 292                         in_completion_filter,
 293                         recursive, fsp,
 294                         smbd_smb2_notify_reply);
 295         if (!NT_STATUS_IS_OK(status)) {
 296                 tevent_req_nterror(req, status);
 297                 return tevent_req_post(req, ev);
 298         }
 299
 300         return req;
 301 }
 302
 303 static void smbd_smb2_notify_reply(struct smb_request *smbreq,
 304                                    NTSTATUS error_code,
 305                                    uint8_t *buf, size_t len)
 306 {
 307         struct tevent_req *req = talloc_get_type_abort(smbreq->async_priv,
 308                                                        struct tevent_req);
 309         struct smbd_smb2_notify_state *state = tevent_req_data(req,
 310                                                struct smbd_smb2_notify_state);
 311
 312         state->status = error_code;
 313         if (!NT_STATUS_IS_OK(error_code)) {
 314                 /* nothing */
 315         } else if (len == 0) {
 316                 state->status = STATUS_NOTIFY_ENUM_DIR;
 317         } else {
 318                 state->out_output_buffer = data_blob_talloc(state, buf, len);
 319                 if (state->out_output_buffer.data == NULL) {
 320                         state->status = NT_STATUS_NO_MEMORY;
 321                 }
 322         }
 323
 324         if (state->im == NULL) {
 325                 smbd_smb2_notify_reply_trigger(NULL, NULL, req);
 326                 return;
 327         }
 328
 329         /*
 330          * if this is called async, we need to go via an immediate event
 331          * because the caller replies on the smb_request (a child of req
 332          * being arround after calling this function
 333          */
 334         tevent_schedule_immediate(state->im,
 335                                   state->smb2req->sconn->smb2.event_ctx,
 336                                   smbd_smb2_notify_reply_trigger,
 337                                   req);
 338 }
 339
 340 static void smbd_smb2_notify_reply_trigger(struct tevent_context *ctx,
 341                                            struct tevent_immediate *im,
 342                                            void *private_data)
 343 {
 344         struct tevent_req *req = talloc_get_type_abort(private_data,
 345                                                        struct tevent_req);
 346         struct smbd_smb2_notify_state *state = tevent_req_data(req,
 347                                                struct smbd_smb2_notify_state);
 348
 349         if (!NT_STATUS_IS_OK(state->status)) {
 350                 tevent_req_nterror(req, state->status);
 351                 return;
 352         }
 353
 354         tevent_req_done(req);
 355 }
 356
 357 static NTSTATUS smbd_smb2_notify_recv(struct tevent_req *req,
 358                                       TALLOC_CTX *mem_ctx,
 359                                       DATA_BLOB *out_output_buffer)
 360 {
 361         NTSTATUS status;
 362         struct smbd_smb2_notify_state *state = tevent_req_data(req,
 363                                                struct smbd_smb2_notify_state);
 364
 365         if (tevent_req_is_nterror(req, &status)) {
 366                 tevent_req_received(req);
 367                 return status;
 368         }
 369
 370         *out_output_buffer = state->out_output_buffer;
 371         talloc_steal(mem_ctx, out_output_buffer->data);
 372
 373         tevent_req_received(req);
 374         return NT_STATUS_OK;
 375 }