source3/smbd/smb2_find.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/smbd.h"
  23 #include "smbd/globals.h"
  24 #include "../libcli/smb/smb_common.h"
  25 #include "trans2.h"
  26 #include "../lib/util/tevent_ntstatus.h"
  27
  28 static struct tevent_req *smbd_smb2_find_send(TALLOC_CTX *mem_ctx,
  29                                               struct tevent_context *ev,
  30                                               struct smbd_smb2_request *smb2req,
  31                                               uint8_t in_file_info_class,
  32                                               uint8_t in_flags,
  33                                               uint32_t in_file_index,
  34                                               uint64_t in_file_id_volatile,
  35                                               uint32_t in_output_buffer_length,
  36                                               const char *in_file_name);
  37 static NTSTATUS smbd_smb2_find_recv(struct tevent_req *req,
  38                                     TALLOC_CTX *mem_ctx,
  39                                     DATA_BLOB *out_output_buffer);
  40
  41 static void smbd_smb2_request_find_done(struct tevent_req *subreq);
  42 NTSTATUS smbd_smb2_request_process_find(struct smbd_smb2_request *req)
  43 {
  44         const uint8_t *inhdr;
  45         const uint8_t *inbody;
  46         int i = req->current_idx;
  47         size_t expected_body_size = 0x21;
  48         size_t body_size;
  49         uint8_t in_file_info_class;
  50         uint8_t in_flags;
  51         uint32_t in_file_index;
  52         uint64_t in_file_id_persistent;
  53         uint64_t in_file_id_volatile;
  54         uint16_t in_file_name_offset;
  55         uint16_t in_file_name_length;
  56         DATA_BLOB in_file_name_buffer;
  57         char *in_file_name_string;
  58         size_t in_file_name_string_size;
  59         uint32_t in_output_buffer_length;
  60         struct tevent_req *subreq;
  61         bool ok;
  62
  63         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
  64         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
  65                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  66         }
  67
  68         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  69
  70         body_size = SVAL(inbody, 0x00);
  71         if (body_size != expected_body_size) {
  72                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  73         }
  74
  75         in_file_info_class              = CVAL(inbody, 0x02);
  76         in_flags                        = CVAL(inbody, 0x03);
  77         in_file_index                   = IVAL(inbody, 0x04);
  78         in_file_id_persistent           = BVAL(inbody, 0x08);
  79         in_file_id_volatile             = BVAL(inbody, 0x10);
  80         in_file_name_offset             = SVAL(inbody, 0x18);
  81         in_file_name_length             = SVAL(inbody, 0x1A);
  82         in_output_buffer_length         = IVAL(inbody, 0x1C);
  83
  84         if (in_file_name_offset == 0 && in_file_name_length == 0) {
  85                 /* This is ok */
  86         } else if (in_file_name_offset !=
  87                    (SMB2_HDR_BODY + (body_size & 0xFFFFFFFE))) {
  88                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  89         }
  90
  91         if (in_file_name_length > req->in.vector[i+2].iov_len) {
  92                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  93         }
  94
  95         /* The output header is 8 bytes. */
  96         if (in_output_buffer_length <= 8) {
  97                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  98         }
  99
 100         DEBUG(10,("smbd_smb2_request_find_done: in_output_buffer_length = %u\n",
 101                 (unsigned int)in_output_buffer_length ));
 102
 103         /* Take into account the output header. */
 104         in_output_buffer_length -= 8;
 105
 106         in_file_name_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
 107         in_file_name_buffer.length = in_file_name_length;
 108
 109         ok = convert_string_talloc(req, CH_UTF16, CH_UNIX,
 110                                    in_file_name_buffer.data,
 111                                    in_file_name_buffer.length,
 112                                    &in_file_name_string,
 113                                    &in_file_name_string_size);
 114         if (!ok) {
 115                 return smbd_smb2_request_error(req, NT_STATUS_ILLEGAL_CHARACTER);
 116         }
 117
 118         if (req->compat_chain_fsp) {
 119                 /* skip check */
 120         } else if (in_file_id_persistent != in_file_id_volatile) {
 121                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
 122         }
 123
 124         subreq = smbd_smb2_find_send(req,
 125                                      req->sconn->smb2.event_ctx,
 126                                      req,
 127                                      in_file_info_class,
 128                                      in_flags,
 129                                      in_file_index,
 130                                      in_file_id_volatile,
 131                                      in_output_buffer_length,
 132                                      in_file_name_string);
 133         if (subreq == NULL) {
 134                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 135         }
 136         tevent_req_set_callback(subreq, smbd_smb2_request_find_done, req);
 137
 138         return smbd_smb2_request_pending_queue(req, subreq);
 139 }
 140
 141 static void smbd_smb2_request_find_done(struct tevent_req *subreq)
 142 {
 143         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 144                                         struct smbd_smb2_request);
 145         int i = req->current_idx;
 146         uint8_t *outhdr;
 147         DATA_BLOB outbody;
 148         DATA_BLOB outdyn;
 149         uint16_t out_output_buffer_offset;
 150         DATA_BLOB out_output_buffer = data_blob_null;
 151         NTSTATUS status;
 152         NTSTATUS error; /* transport error */
 153
 154         status = smbd_smb2_find_recv(subreq,
 155                                      req,
 156                                      &out_output_buffer);
 157         TALLOC_FREE(subreq);
 158         if (!NT_STATUS_IS_OK(status)) {
 159                 error = smbd_smb2_request_error(req, status);
 160                 if (!NT_STATUS_IS_OK(error)) {
 161                         smbd_server_connection_terminate(req->sconn,
 162                                                          nt_errstr(error));
 163                         return;
 164                 }
 165                 return;
 166         }
 167
 168         out_output_buffer_offset = SMB2_HDR_BODY + 0x08;
 169
 170         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 171
 172         outbody = data_blob_talloc(req->out.vector, NULL, 0x08);
 173         if (outbody.data == NULL) {
 174                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 175                 if (!NT_STATUS_IS_OK(error)) {
 176                         smbd_server_connection_terminate(req->sconn,
 177                                                          nt_errstr(error));
 178                         return;
 179                 }
 180                 return;
 181         }
 182
 183         SSVAL(outbody.data, 0x00, 0x08 + 1);    /* struct size */
 184         SSVAL(outbody.data, 0x02,
 185               out_output_buffer_offset);        /* output buffer offset */
 186         SIVAL(outbody.data, 0x04,
 187               out_output_buffer.length);        /* output buffer length */
 188
 189         DEBUG(10,("smbd_smb2_request_find_done: out_output_buffer.length = %u\n",
 190                 (unsigned int)out_output_buffer.length ));
 191
 192         outdyn = out_output_buffer;
 193
 194         error = smbd_smb2_request_done(req, outbody, &outdyn);
 195         if (!NT_STATUS_IS_OK(error)) {
 196                 smbd_server_connection_terminate(req->sconn,
 197                                                  nt_errstr(error));
 198                 return;
 199         }
 200 }
 201
 202 struct smbd_smb2_find_state {
 203         struct smbd_smb2_request *smb2req;
 204         DATA_BLOB out_output_buffer;
 205 };
 206
 207 static struct tevent_req *smbd_smb2_find_send(TALLOC_CTX *mem_ctx,
 208                                               struct tevent_context *ev,
 209                                               struct smbd_smb2_request *smb2req,
 210                                               uint8_t in_file_info_class,
 211                                               uint8_t in_flags,
 212                                               uint32_t in_file_index,
 213                                               uint64_t in_file_id_volatile,
 214                                               uint32_t in_output_buffer_length,
 215                                               const char *in_file_name)
 216 {
 217         struct tevent_req *req;
 218         struct smbd_smb2_find_state *state;
 219         struct smb_request *smbreq;
 220         connection_struct *conn = smb2req->tcon->compat_conn;
 221         files_struct *fsp;
 222         NTSTATUS status;
 223         NTSTATUS empty_status;
 224         uint32_t info_level;
 225         uint32_t max_count;
 226         char *pdata;
 227         char *base_data;
 228         char *end_data;
 229         int last_entry_off = 0;
 230         int off = 0;
 231         uint32_t num = 0;
 232         uint32_t dirtype = FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM | FILE_ATTRIBUTE_DIRECTORY;
 233         bool dont_descend = false;
 234         bool ask_sharemode = true;
 235
 236         req = tevent_req_create(mem_ctx, &state,
 237                                 struct smbd_smb2_find_state);
 238         if (req == NULL) {
 239                 return NULL;
 240         }
 241         state->smb2req = smb2req;
 242         state->out_output_buffer = data_blob_null;
 243
 244         DEBUG(10,("smbd_smb2_find_send: file_id[0x%016llX]\n",
 245                   (unsigned long long)in_file_id_volatile));
 246
 247         smbreq = smbd_smb2_fake_smb_request(smb2req);
 248         if (tevent_req_nomem(smbreq, req)) {
 249                 return tevent_req_post(req, ev);
 250         }
 251
 252         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 253         if (fsp == NULL) {
 254                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 255                 return tevent_req_post(req, ev);
 256         }
 257         if (conn != fsp->conn) {
 258                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 259                 return tevent_req_post(req, ev);
 260         }
 261         if (smb2req->session->vuid != fsp->vuid) {
 262                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 263                 return tevent_req_post(req, ev);
 264         }
 265
 266         if (!fsp->is_directory) {
 267                 tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
 268                 return tevent_req_post(req, ev);
 269         }
 270
 271         if (strcmp(in_file_name, "") == 0) {
 272                 tevent_req_nterror(req, NT_STATUS_OBJECT_NAME_INVALID);
 273                 return tevent_req_post(req, ev);
 274         }
 275         if (strcmp(in_file_name, "\\") == 0) {
 276                 tevent_req_nterror(req, NT_STATUS_OBJECT_NAME_INVALID);
 277                 return tevent_req_post(req, ev);
 278         }
 279         if (strcmp(in_file_name, "/") == 0) {
 280                 tevent_req_nterror(req, NT_STATUS_OBJECT_NAME_INVALID);
 281                 return tevent_req_post(req, ev);
 282         }
 283
 284         if (in_output_buffer_length > 0x10000) {
 285                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 286                 return tevent_req_post(req, ev);
 287         }
 288
 289         switch (in_file_info_class) {
 290         case SMB2_FIND_DIRECTORY_INFO:
 291                 info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 292                 break;
 293
 294         case SMB2_FIND_FULL_DIRECTORY_INFO:
 295                 info_level = SMB_FIND_FILE_FULL_DIRECTORY_INFO;
 296                 break;
 297
 298         case SMB2_FIND_BOTH_DIRECTORY_INFO:
 299                 info_level = SMB_FIND_FILE_BOTH_DIRECTORY_INFO;
 300                 break;
 301
 302         case SMB2_FIND_NAME_INFO:
 303                 info_level = SMB_FIND_FILE_NAMES_INFO;
 304                 break;
 305
 306         case SMB2_FIND_ID_BOTH_DIRECTORY_INFO:
 307                 info_level = SMB_FIND_ID_BOTH_DIRECTORY_INFO;
 308                 break;
 309
 310         case SMB2_FIND_ID_FULL_DIRECTORY_INFO:
 311                 info_level = SMB_FIND_ID_FULL_DIRECTORY_INFO;
 312                 break;
 313
 314         default:
 315                 tevent_req_nterror(req, NT_STATUS_INVALID_INFO_CLASS);
 316                 return tevent_req_post(req, ev);
 317         }
 318
 319         if (in_flags & SMB2_CONTINUE_FLAG_REOPEN) {
 320                 dptr_CloseDir(fsp);
 321         }
 322
 323         if (fsp->dptr == NULL) {
 324                 bool wcard_has_wild;
 325
 326                 if (!(fsp->access_mask & SEC_DIR_LIST)) {
 327                         tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 328                         return tevent_req_post(req, ev);
 329                 }
 330
 331                 wcard_has_wild = ms_has_wild(in_file_name);
 332
 333                 status = dptr_create(conn,
 334                                      fsp,
 335                                      fsp->fsp_name->base_name,
 336                                      false, /* old_handle */
 337                                      false, /* expect_close */
 338                                      0, /* spid */
 339                                      in_file_name, /* wcard */
 340                                      wcard_has_wild,
 341                                      dirtype,
 342                                      &fsp->dptr);
 343                 if (!NT_STATUS_IS_OK(status)) {
 344                         tevent_req_nterror(req, status);
 345                         return tevent_req_post(req, ev);
 346                 }
 347
 348                 empty_status = NT_STATUS_NO_SUCH_FILE;
 349         } else {
 350                 empty_status = STATUS_NO_MORE_FILES;
 351         }
 352
 353         if (in_flags & SMB2_CONTINUE_FLAG_RESTART) {
 354                 dptr_SeekDir(fsp->dptr, 0);
 355         }
 356
 357         if (in_flags & SMB2_CONTINUE_FLAG_SINGLE) {
 358                 max_count = 1;
 359         } else {
 360                 max_count = UINT16_MAX;
 361         }
 362
 363 #define DIR_ENTRY_SAFETY_MARGIN 4096
 364
 365         state->out_output_buffer = data_blob_talloc(state, NULL,
 366                         in_output_buffer_length + DIR_ENTRY_SAFETY_MARGIN);
 367         if (tevent_req_nomem(state->out_output_buffer.data, req)) {
 368                 return tevent_req_post(req, ev);
 369         }
 370
 371         state->out_output_buffer.length = 0;
 372         pdata = (char *)state->out_output_buffer.data;
 373         base_data = pdata;
 374         /*
 375          * end_data must include the safety margin as it's what is
 376          * used to determine if pushed strings have been truncated.
 377          */
 378         end_data = pdata + in_output_buffer_length + DIR_ENTRY_SAFETY_MARGIN - 1;
 379         last_entry_off = 0;
 380         off = 0;
 381         num = 0;
 382
 383         DEBUG(8,("smbd_smb2_find_send: dirpath=<%s> dontdescend=<%s>, "
 384                 "in_output_buffer_length = %u\n",
 385                 fsp->fsp_name->base_name, lp_dontdescend(SNUM(conn)),
 386                 (unsigned int)in_output_buffer_length ));
 387         if (in_list(fsp->fsp_name->base_name,lp_dontdescend(SNUM(conn)),
 388                         conn->case_sensitive)) {
 389                 dont_descend = true;
 390         }
 391
 392         ask_sharemode = lp_parm_bool(SNUM(conn),
 393                                      "smbd", "search ask sharemode",
 394                                      true);
 395
 396         while (true) {
 397                 bool ok;
 398                 bool got_exact_match = false;
 399                 bool out_of_space = false;
 400                 int space_remaining = in_output_buffer_length - off;
 401
 402                 SMB_ASSERT(space_remaining >= 0);
 403
 404                 ok = smbd_dirptr_lanman2_entry(state,
 405                                                conn,
 406                                                fsp->dptr,
 407                                                smbreq->flags2,
 408                                                in_file_name,
 409                                                dirtype,
 410                                                info_level,
 411                                                false, /* requires_resume_key */
 412                                                dont_descend,
 413                                                ask_sharemode,
 414                                                8, /* align to 8 bytes */
 415                                                false, /* no padding */
 416                                                &pdata,
 417                                                base_data,
 418                                                end_data,
 419                                                space_remaining,
 420                                                &out_of_space,
 421                                                &got_exact_match,
 422                                                &last_entry_off,
 423                                                NULL);
 424
 425                 off = (int)PTR_DIFF(pdata, base_data);
 426
 427                 if (!ok) {
 428                         if (num > 0) {
 429                                 SIVAL(state->out_output_buffer.data, last_entry_off, 0);
 430                                 tevent_req_done(req);
 431                                 return tevent_req_post(req, ev);
 432                         } else if (out_of_space) {
 433                                 tevent_req_nterror(req, NT_STATUS_INFO_LENGTH_MISMATCH);
 434                                 return tevent_req_post(req, ev);
 435                         } else {
 436                                 tevent_req_nterror(req, empty_status);
 437                                 return tevent_req_post(req, ev);
 438                         }
 439                 }
 440
 441                 num++;
 442                 state->out_output_buffer.length = off;
 443
 444                 if (num < max_count) {
 445                         continue;
 446                 }
 447
 448                 SIVAL(state->out_output_buffer.data, last_entry_off, 0);
 449                 tevent_req_done(req);
 450                 return tevent_req_post(req, ev);
 451         }
 452
 453         tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 454         return tevent_req_post(req, ev);
 455 }
 456
 457 static NTSTATUS smbd_smb2_find_recv(struct tevent_req *req,
 458                                     TALLOC_CTX *mem_ctx,
 459                                     DATA_BLOB *out_output_buffer)
 460 {
 461         NTSTATUS status;
 462         struct smbd_smb2_find_state *state = tevent_req_data(req,
 463                                              struct smbd_smb2_find_state);
 464
 465         if (tevent_req_is_nterror(req, &status)) {
 466                 tevent_req_received(req);
 467                 return status;
 468         }
 469
 470         *out_output_buffer = state->out_output_buffer;
 471         talloc_steal(mem_ctx, out_output_buffer->data);
 472
 473         tevent_req_received(req);
 474         return NT_STATUS_OK;
 475 }