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/globals.h"
  23 #include "../libcli/smb/smb_common.h"
  24
  25 static struct tevent_req *smbd_smb2_find_send(TALLOC_CTX *mem_ctx,
  26                                               struct tevent_context *ev,
  27                                               struct smbd_smb2_request *smb2req,
  28                                               uint8_t in_file_info_class,
  29                                               uint8_t in_flags,
  30                                               uint32_t in_file_index,
  31                                               uint64_t in_file_id_volatile,
  32                                               uint32_t in_output_buffer_length,
  33                                               const char *in_file_name);
  34 static NTSTATUS smbd_smb2_find_recv(struct tevent_req *req,
  35                                     TALLOC_CTX *mem_ctx,
  36                                     DATA_BLOB *out_output_buffer);
  37
  38 static void smbd_smb2_request_find_done(struct tevent_req *subreq);
  39 NTSTATUS smbd_smb2_request_process_find(struct smbd_smb2_request *req)
  40 {
  41         const uint8_t *inhdr;
  42         const uint8_t *inbody;
  43         int i = req->current_idx;
  44         size_t expected_body_size = 0x21;
  45         size_t body_size;
  46         uint8_t in_file_info_class;
  47         uint8_t in_flags;
  48         uint32_t in_file_index;
  49         uint64_t in_file_id_persistent;
  50         uint64_t in_file_id_volatile;
  51         uint16_t in_file_name_offset;
  52         uint16_t in_file_name_length;
  53         DATA_BLOB in_file_name_buffer;
  54         char *in_file_name_string;
  55         size_t in_file_name_string_size;
  56         uint32_t in_output_buffer_length;
  57         struct tevent_req *subreq;
  58         bool ok;
  59
  60         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
  61         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
  62                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  63         }
  64
  65         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  66
  67         body_size = SVAL(inbody, 0x00);
  68         if (body_size != expected_body_size) {
  69                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  70         }
  71
  72         in_file_info_class              = CVAL(inbody, 0x02);
  73         in_flags                        = CVAL(inbody, 0x03);
  74         in_file_index                   = IVAL(inbody, 0x04);
  75         in_file_id_persistent           = BVAL(inbody, 0x08);
  76         in_file_id_volatile             = BVAL(inbody, 0x10);
  77         in_file_name_offset             = SVAL(inbody, 0x18);
  78         in_file_name_length             = SVAL(inbody, 0x1A);
  79         in_output_buffer_length         = IVAL(inbody, 0x1C);
  80
  81         if (in_file_name_offset == 0 && in_file_name_length == 0) {
  82                 /* This is ok */
  83         } else if (in_file_name_offset !=
  84                    (SMB2_HDR_BODY + (body_size & 0xFFFFFFFE))) {
  85                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  86         }
  87
  88         if (in_file_name_length > req->in.vector[i+2].iov_len) {
  89                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  90         }
  91
  92         /* The output header is 8 bytes. */
  93         if (in_output_buffer_length <= 8) {
  94                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  95         }
  96
  97         DEBUG(10,("smbd_smb2_request_find_done: in_output_buffer_length = %u\n",
  98                 (unsigned int)in_output_buffer_length ));
  99
 100         /* Take into account the output header. */
 101         in_output_buffer_length -= 8;
 102
 103         in_file_name_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
 104         in_file_name_buffer.length = in_file_name_length;
 105
 106         ok = convert_string_talloc(req, CH_UTF16, CH_UNIX,
 107                                    in_file_name_buffer.data,
 108                                    in_file_name_buffer.length,
 109                                    &in_file_name_string,
 110                                    &in_file_name_string_size, false);
 111         if (!ok) {
 112                 return smbd_smb2_request_error(req, NT_STATUS_ILLEGAL_CHARACTER);
 113         }
 114
 115         if (req->compat_chain_fsp) {
 116                 /* skip check */
 117         } else if (in_file_id_persistent != 0) {
 118                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
 119         }
 120
 121         subreq = smbd_smb2_find_send(req,
 122                                      req->sconn->smb2.event_ctx,
 123                                      req,
 124                                      in_file_info_class,
 125                                      in_flags,
 126                                      in_file_index,
 127                                      in_file_id_volatile,
 128                                      in_output_buffer_length,
 129                                      in_file_name_string);
 130         if (subreq == NULL) {
 131                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 132         }
 133         tevent_req_set_callback(subreq, smbd_smb2_request_find_done, req);
 134
 135         return smbd_smb2_request_pending_queue(req, subreq);
 136 }
 137
 138 static void smbd_smb2_request_find_done(struct tevent_req *subreq)
 139 {
 140         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 141                                         struct smbd_smb2_request);
 142         int i = req->current_idx;
 143         uint8_t *outhdr;
 144         DATA_BLOB outbody;
 145         DATA_BLOB outdyn;
 146         uint16_t out_output_buffer_offset;
 147         DATA_BLOB out_output_buffer = data_blob_null;
 148         NTSTATUS status;
 149         NTSTATUS error; /* transport error */
 150
 151         status = smbd_smb2_find_recv(subreq,
 152                                      req,
 153                                      &out_output_buffer);
 154         TALLOC_FREE(subreq);
 155         if (!NT_STATUS_IS_OK(status)) {
 156                 error = smbd_smb2_request_error(req, status);
 157                 if (!NT_STATUS_IS_OK(error)) {
 158                         smbd_server_connection_terminate(req->sconn,
 159                                                          nt_errstr(error));
 160                         return;
 161                 }
 162                 return;
 163         }
 164
 165         out_output_buffer_offset = SMB2_HDR_BODY + 0x08;
 166
 167         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 168
 169         outbody = data_blob_talloc(req->out.vector, NULL, 0x08);
 170         if (outbody.data == NULL) {
 171                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 172                 if (!NT_STATUS_IS_OK(error)) {
 173                         smbd_server_connection_terminate(req->sconn,
 174                                                          nt_errstr(error));
 175                         return;
 176                 }
 177                 return;
 178         }
 179
 180         SSVAL(outbody.data, 0x00, 0x08 + 1);    /* struct size */
 181         SSVAL(outbody.data, 0x02,
 182               out_output_buffer_offset);        /* output buffer offset */
 183         SIVAL(outbody.data, 0x04,
 184               out_output_buffer.length);        /* output buffer length */
 185
 186         DEBUG(10,("smbd_smb2_request_find_done: out_output_buffer.length = %u\n",
 187                 (unsigned int)out_output_buffer.length ));
 188
 189         outdyn = out_output_buffer;
 190
 191         error = smbd_smb2_request_done(req, outbody, &outdyn);
 192         if (!NT_STATUS_IS_OK(error)) {
 193                 smbd_server_connection_terminate(req->sconn,
 194                                                  nt_errstr(error));
 195                 return;
 196         }
 197 }
 198
 199 struct smbd_smb2_find_state {
 200         struct smbd_smb2_request *smb2req;
 201         DATA_BLOB out_output_buffer;
 202 };
 203
 204 static struct tevent_req *smbd_smb2_find_send(TALLOC_CTX *mem_ctx,
 205                                               struct tevent_context *ev,
 206                                               struct smbd_smb2_request *smb2req,
 207                                               uint8_t in_file_info_class,
 208                                               uint8_t in_flags,
 209                                               uint32_t in_file_index,
 210                                               uint64_t in_file_id_volatile,
 211                                               uint32_t in_output_buffer_length,
 212                                               const char *in_file_name)
 213 {
 214         struct tevent_req *req;
 215         struct smbd_smb2_find_state *state;
 216         struct smb_request *smbreq;
 217         connection_struct *conn = smb2req->tcon->compat_conn;
 218         files_struct *fsp;
 219         NTSTATUS status;
 220         NTSTATUS empty_status;
 221         uint32_t info_level;
 222         uint32_t max_count;
 223         char *pdata;
 224         char *base_data;
 225         char *end_data;
 226         int last_entry_off = 0;
 227         int off = 0;
 228         uint32_t num = 0;
 229         uint32_t dirtype = aHIDDEN | aSYSTEM | aDIR;
 230         const char *directory;
 231         bool dont_descend = false;
 232         bool ask_sharemode = true;
 233
 234         req = tevent_req_create(mem_ctx, &state,
 235                                 struct smbd_smb2_find_state);
 236         if (req == NULL) {
 237                 return NULL;
 238         }
 239         state->smb2req = smb2req;
 240         state->out_output_buffer = data_blob_null;
 241
 242         DEBUG(10,("smbd_smb2_find_send: file_id[0x%016llX]\n",
 243                   (unsigned long long)in_file_id_volatile));
 244
 245         smbreq = smbd_smb2_fake_smb_request(smb2req);
 246         if (tevent_req_nomem(smbreq, req)) {
 247                 return tevent_req_post(req, ev);
 248         }
 249
 250         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 251         if (fsp == NULL) {
 252                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 253                 return tevent_req_post(req, ev);
 254         }
 255         if (conn != fsp->conn) {
 256                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 257                 return tevent_req_post(req, ev);
 258         }
 259         if (smb2req->session->vuid != fsp->vuid) {
 260                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 261                 return tevent_req_post(req, ev);
 262         }
 263
 264         if (!fsp->is_directory) {
 265                 tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
 266                 return tevent_req_post(req, ev);
 267         }
 268
 269         directory = fsp->fsp_name->base_name;
 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                 if (fsp->dptr) {
 321                         dptr_CloseDir(fsp->dptr);
 322                         fsp->dptr = NULL;
 323                 }
 324         }
 325
 326         if (fsp->dptr == NULL) {
 327                 bool wcard_has_wild;
 328
 329                 if (!(fsp->access_mask & SEC_DIR_LIST)) {
 330                         tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 331                         return tevent_req_post(req, ev);
 332                 }
 333
 334                 wcard_has_wild = ms_has_wild(in_file_name);
 335
 336                 status = dptr_create(conn,
 337                                      directory,
 338                                      false, /* old_handle */
 339                                      false, /* expect_close */
 340                                      0, /* spid */
 341                                      in_file_name, /* wcard */
 342                                      wcard_has_wild,
 343                                      dirtype,
 344                                      &fsp->dptr);
 345                 if (!NT_STATUS_IS_OK(status)) {
 346                         tevent_req_nterror(req, status);
 347                         return tevent_req_post(req, ev);
 348                 }
 349
 350                 empty_status = NT_STATUS_NO_SUCH_FILE;
 351         } else {
 352                 empty_status = STATUS_NO_MORE_FILES;
 353         }
 354
 355         if (in_flags & SMB2_CONTINUE_FLAG_RESTART) {
 356                 dptr_SeekDir(fsp->dptr, 0);
 357         }
 358
 359         if (in_flags & SMB2_CONTINUE_FLAG_SINGLE) {
 360                 max_count = 1;
 361         } else {
 362                 max_count = UINT16_MAX;
 363         }
 364
 365 #define DIR_ENTRY_SAFETY_MARGIN 4096
 366
 367         state->out_output_buffer = data_blob_talloc(state, NULL,
 368                         in_output_buffer_length + DIR_ENTRY_SAFETY_MARGIN);
 369         if (tevent_req_nomem(state->out_output_buffer.data, req)) {
 370                 return tevent_req_post(req, ev);
 371         }
 372
 373         state->out_output_buffer.length = 0;
 374         pdata = (char *)state->out_output_buffer.data;
 375         base_data = pdata;
 376         /*
 377          * end_data must include the safety margin as it's what is
 378          * used to determine if pushed strings have been truncated.
 379          */
 380         end_data = pdata + in_output_buffer_length + DIR_ENTRY_SAFETY_MARGIN - 1;
 381         last_entry_off = 0;
 382         off = 0;
 383         num = 0;
 384
 385         DEBUG(8,("smbd_smb2_find_send: dirpath=<%s> dontdescend=<%s>, "
 386                 "in_output_buffer_length = %u\n",
 387                 directory, lp_dontdescend(SNUM(conn)),
 388                 (unsigned int)in_output_buffer_length ));
 389         if (in_list(directory,lp_dontdescend(SNUM(conn)),conn->case_sensitive)) {
 390                 dont_descend = true;
 391         }
 392
 393         ask_sharemode = lp_parm_bool(SNUM(conn),
 394                                      "smbd", "search ask sharemode",
 395                                      true);
 396
 397         while (true) {
 398                 bool ok;
 399                 bool got_exact_match = false;
 400                 bool out_of_space = false;
 401                 int space_remaining = in_output_buffer_length - off;
 402
 403                 SMB_ASSERT(space_remaining >= 0);
 404
 405                 ok = smbd_dirptr_lanman2_entry(state,
 406                                                conn,
 407                                                fsp->dptr,
 408                                                smbreq->flags2,
 409                                                in_file_name,
 410                                                dirtype,
 411                                                info_level,
 412                                                false, /* requires_resume_key */
 413                                                dont_descend,
 414                                                ask_sharemode,
 415                                                8, /* align to 8 bytes */
 416                                                false, /* no padding */
 417                                                &pdata,
 418                                                base_data,
 419                                                end_data,
 420                                                space_remaining,
 421                                                &out_of_space,
 422                                                &got_exact_match,
 423                                                &last_entry_off,
 424                                                NULL);
 425
 426                 off = (int)PTR_DIFF(pdata, base_data);
 427
 428                 if (!ok) {
 429                         if (num > 0) {
 430                                 SIVAL(state->out_output_buffer.data, last_entry_off, 0);
 431                                 tevent_req_done(req);
 432                                 return tevent_req_post(req, ev);
 433                         } else if (out_of_space) {
 434                                 tevent_req_nterror(req, NT_STATUS_INFO_LENGTH_MISMATCH);
 435                                 return tevent_req_post(req, ev);
 436                         } else {
 437                                 tevent_req_nterror(req, empty_status);
 438                                 return tevent_req_post(req, ev);
 439                         }
 440                 }
 441
 442                 num++;
 443                 state->out_output_buffer.length = off;
 444
 445                 if (num < max_count) {
 446                         continue;
 447                 }
 448
 449                 SIVAL(state->out_output_buffer.data, last_entry_off, 0);
 450                 tevent_req_done(req);
 451                 return tevent_req_post(req, ev);
 452         }
 453
 454         tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 455         return tevent_req_post(req, ev);
 456 }
 457
 458 static NTSTATUS smbd_smb2_find_recv(struct tevent_req *req,
 459                                     TALLOC_CTX *mem_ctx,
 460                                     DATA_BLOB *out_output_buffer)
 461 {
 462         NTSTATUS status;
 463         struct smbd_smb2_find_state *state = tevent_req_data(req,
 464                                              struct smbd_smb2_find_state);
 465
 466         if (tevent_req_is_nterror(req, &status)) {
 467                 tevent_req_received(req);
 468                 return status;
 469         }
 470
 471         *out_output_buffer = state->out_output_buffer;
 472         talloc_steal(mem_ctx, out_output_buffer->data);
 473
 474         tevent_req_received(req);
 475         return NT_STATUS_OK;
 476 }