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                                               struct files_struct *in_fsp,
  32                                               uint8_t in_file_info_class,
  33                                               uint8_t in_flags,
  34                                               uint32_t in_file_index,
  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         NTSTATUS status;
  45         const uint8_t *inbody;
  46         int i = req->current_idx;
  47         uint8_t in_file_info_class;
  48         uint8_t in_flags;
  49         uint32_t in_file_index;
  50         uint64_t in_file_id_persistent;
  51         uint64_t in_file_id_volatile;
  52         struct files_struct *in_fsp;
  53         uint16_t in_file_name_offset;
  54         uint16_t in_file_name_length;
  55         DATA_BLOB in_file_name_buffer;
  56         char *in_file_name_string;
  57         size_t in_file_name_string_size;
  58         uint32_t in_output_buffer_length;
  59         struct tevent_req *subreq;
  60         bool ok;
  61
  62         status = smbd_smb2_request_verify_sizes(req, 0x21);
  63         if (!NT_STATUS_IS_OK(status)) {
  64                 return smbd_smb2_request_error(req, status);
  65         }
  66         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  67
  68         in_file_info_class              = CVAL(inbody, 0x02);
  69         in_flags                        = CVAL(inbody, 0x03);
  70         in_file_index                   = IVAL(inbody, 0x04);
  71         in_file_id_persistent           = BVAL(inbody, 0x08);
  72         in_file_id_volatile             = BVAL(inbody, 0x10);
  73         in_file_name_offset             = SVAL(inbody, 0x18);
  74         in_file_name_length             = SVAL(inbody, 0x1A);
  75         in_output_buffer_length         = IVAL(inbody, 0x1C);
  76
  77         if (in_file_name_offset == 0 && in_file_name_length == 0) {
  78                 /* This is ok */
  79         } else if (in_file_name_offset !=
  80                    (SMB2_HDR_BODY + req->in.vector[i+1].iov_len)) {
  81                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  82         }
  83
  84         if (in_file_name_length > req->in.vector[i+2].iov_len) {
  85                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  86         }
  87
  88         /* The output header is 8 bytes. */
  89         if (in_output_buffer_length <= 8) {
  90                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  91         }
  92
  93         DEBUG(10,("smbd_smb2_request_find_done: in_output_buffer_length = %u\n",
  94                 (unsigned int)in_output_buffer_length ));
  95
  96         /* Take into account the output header. */
  97         in_output_buffer_length -= 8;
  98
  99         in_file_name_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
 100         in_file_name_buffer.length = in_file_name_length;
 101
 102         ok = convert_string_talloc(req, CH_UTF16, CH_UNIX,
 103                                    in_file_name_buffer.data,
 104                                    in_file_name_buffer.length,
 105                                    &in_file_name_string,
 106                                    &in_file_name_string_size);
 107         if (!ok) {
 108                 return smbd_smb2_request_error(req, NT_STATUS_ILLEGAL_CHARACTER);
 109         }
 110
 111         if (in_file_name_buffer.length == 0) {
 112                 in_file_name_string_size = 0;
 113         }
 114
 115         if (strlen(in_file_name_string) != in_file_name_string_size) {
 116                 return smbd_smb2_request_error(req, NT_STATUS_OBJECT_NAME_INVALID);
 117         }
 118
 119         in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
 120         if (in_fsp == NULL) {
 121                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
 122         }
 123
 124         subreq = smbd_smb2_find_send(req, req->sconn->ev_ctx,
 125                                      req, in_fsp,
 126                                      in_file_info_class,
 127                                      in_flags,
 128                                      in_file_index,
 129                                      in_output_buffer_length,
 130                                      in_file_name_string);
 131         if (subreq == NULL) {
 132                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 133         }
 134         tevent_req_set_callback(subreq, smbd_smb2_request_find_done, req);
 135
 136         return smbd_smb2_request_pending_queue(req, subreq, 500);
 137 }
 138
 139 static void smbd_smb2_request_find_done(struct tevent_req *subreq)
 140 {
 141         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 142                                         struct smbd_smb2_request);
 143         DATA_BLOB outbody;
 144         DATA_BLOB outdyn;
 145         uint16_t out_output_buffer_offset;
 146         DATA_BLOB out_output_buffer = data_blob_null;
 147         NTSTATUS status;
 148         NTSTATUS error; /* transport error */
 149
 150         status = smbd_smb2_find_recv(subreq,
 151                                      req,
 152                                      &out_output_buffer);
 153         TALLOC_FREE(subreq);
 154         if (!NT_STATUS_IS_OK(status)) {
 155                 error = smbd_smb2_request_error(req, status);
 156                 if (!NT_STATUS_IS_OK(error)) {
 157                         smbd_server_connection_terminate(req->sconn,
 158                                                          nt_errstr(error));
 159                         return;
 160                 }
 161                 return;
 162         }
 163
 164         out_output_buffer_offset = SMB2_HDR_BODY + 0x08;
 165
 166         outbody = data_blob_talloc(req->out.vector, NULL, 0x08);
 167         if (outbody.data == NULL) {
 168                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 169                 if (!NT_STATUS_IS_OK(error)) {
 170                         smbd_server_connection_terminate(req->sconn,
 171                                                          nt_errstr(error));
 172                         return;
 173                 }
 174                 return;
 175         }
 176
 177         SSVAL(outbody.data, 0x00, 0x08 + 1);    /* struct size */
 178         SSVAL(outbody.data, 0x02,
 179               out_output_buffer_offset);        /* output buffer offset */
 180         SIVAL(outbody.data, 0x04,
 181               out_output_buffer.length);        /* output buffer length */
 182
 183         DEBUG(10,("smbd_smb2_request_find_done: out_output_buffer.length = %u\n",
 184                 (unsigned int)out_output_buffer.length ));
 185
 186         outdyn = out_output_buffer;
 187
 188         error = smbd_smb2_request_done(req, outbody, &outdyn);
 189         if (!NT_STATUS_IS_OK(error)) {
 190                 smbd_server_connection_terminate(req->sconn,
 191                                                  nt_errstr(error));
 192                 return;
 193         }
 194 }
 195
 196 struct smbd_smb2_find_state {
 197         struct smbd_smb2_request *smb2req;
 198         DATA_BLOB out_output_buffer;
 199 };
 200
 201 static struct tevent_req *smbd_smb2_find_send(TALLOC_CTX *mem_ctx,
 202                                               struct tevent_context *ev,
 203                                               struct smbd_smb2_request *smb2req,
 204                                               struct files_struct *fsp,
 205                                               uint8_t in_file_info_class,
 206                                               uint8_t in_flags,
 207                                               uint32_t in_file_index,
 208                                               uint32_t in_output_buffer_length,
 209                                               const char *in_file_name)
 210 {
 211         struct tevent_req *req;
 212         struct smbd_smb2_find_state *state;
 213         struct smb_request *smbreq;
 214         connection_struct *conn = smb2req->tcon->compat;
 215         NTSTATUS status;
 216         NTSTATUS empty_status;
 217         uint32_t info_level;
 218         uint32_t max_count;
 219         char *pdata;
 220         char *base_data;
 221         char *end_data;
 222         int last_entry_off = 0;
 223         int off = 0;
 224         uint32_t num = 0;
 225         uint32_t dirtype = FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM | FILE_ATTRIBUTE_DIRECTORY;
 226         bool dont_descend = false;
 227         bool ask_sharemode = true;
 228
 229         req = tevent_req_create(mem_ctx, &state,
 230                                 struct smbd_smb2_find_state);
 231         if (req == NULL) {
 232                 return NULL;
 233         }
 234         state->smb2req = smb2req;
 235         state->out_output_buffer = data_blob_null;
 236
 237         DEBUG(10,("smbd_smb2_find_send: %s - %s\n",
 238                   fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
 239
 240         smbreq = smbd_smb2_fake_smb_request(smb2req);
 241         if (tevent_req_nomem(smbreq, req)) {
 242                 return tevent_req_post(req, ev);
 243         }
 244
 245         if (!fsp->is_directory) {
 246                 tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
 247                 return tevent_req_post(req, ev);
 248         }
 249
 250         if (strcmp(in_file_name, "") == 0) {
 251                 tevent_req_nterror(req, NT_STATUS_OBJECT_NAME_INVALID);
 252                 return tevent_req_post(req, ev);
 253         }
 254         if (strcmp(in_file_name, "\\") == 0) {
 255                 tevent_req_nterror(req, NT_STATUS_OBJECT_NAME_INVALID);
 256                 return tevent_req_post(req, ev);
 257         }
 258         if (strcmp(in_file_name, "/") == 0) {
 259                 tevent_req_nterror(req, NT_STATUS_OBJECT_NAME_INVALID);
 260                 return tevent_req_post(req, ev);
 261         }
 262
 263         if (in_output_buffer_length > smb2req->sconn->smb2.max_trans) {
 264                 DEBUG(2,("smbd_smb2_find_send: "
 265                          "client ignored max trans:%s: 0x%08X: 0x%08X\n",
 266                          __location__, in_output_buffer_length,
 267                          smb2req->sconn->smb2.max_trans));
 268                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 269                 return tevent_req_post(req, ev);
 270         }
 271
 272         status = smbd_smb2_request_verify_creditcharge(smb2req,
 273                                         in_output_buffer_length);
 274
 275         if (!NT_STATUS_IS_OK(status)) {
 276                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 277                 return tevent_req_post(req, ev);
 278         }
 279
 280         switch (in_file_info_class) {
 281         case SMB2_FIND_DIRECTORY_INFO:
 282                 info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 283                 break;
 284
 285         case SMB2_FIND_FULL_DIRECTORY_INFO:
 286                 info_level = SMB_FIND_FILE_FULL_DIRECTORY_INFO;
 287                 break;
 288
 289         case SMB2_FIND_BOTH_DIRECTORY_INFO:
 290                 info_level = SMB_FIND_FILE_BOTH_DIRECTORY_INFO;
 291                 break;
 292
 293         case SMB2_FIND_NAME_INFO:
 294                 info_level = SMB_FIND_FILE_NAMES_INFO;
 295                 break;
 296
 297         case SMB2_FIND_ID_BOTH_DIRECTORY_INFO:
 298                 info_level = SMB_FIND_ID_BOTH_DIRECTORY_INFO;
 299                 break;
 300
 301         case SMB2_FIND_ID_FULL_DIRECTORY_INFO:
 302                 info_level = SMB_FIND_ID_FULL_DIRECTORY_INFO;
 303                 break;
 304
 305         default:
 306                 tevent_req_nterror(req, NT_STATUS_INVALID_INFO_CLASS);
 307                 return tevent_req_post(req, ev);
 308         }
 309
 310         if (in_flags & SMB2_CONTINUE_FLAG_REOPEN) {
 311                 dptr_CloseDir(fsp);
 312         }
 313
 314         if (fsp->dptr == NULL) {
 315                 bool wcard_has_wild;
 316
 317                 wcard_has_wild = ms_has_wild(in_file_name);
 318
 319                 status = dptr_create(conn,
 320                                      NULL, /* req */
 321                                      fsp,
 322                                      fsp->fsp_name->base_name,
 323                                      false, /* old_handle */
 324                                      false, /* expect_close */
 325                                      0, /* spid */
 326                                      in_file_name, /* wcard */
 327                                      wcard_has_wild,
 328                                      dirtype,
 329                                      &fsp->dptr);
 330                 if (!NT_STATUS_IS_OK(status)) {
 331                         tevent_req_nterror(req, status);
 332                         return tevent_req_post(req, ev);
 333                 }
 334
 335                 empty_status = NT_STATUS_NO_SUCH_FILE;
 336         } else {
 337                 empty_status = STATUS_NO_MORE_FILES;
 338         }
 339
 340         if (in_flags & SMB2_CONTINUE_FLAG_RESTART) {
 341                 dptr_SeekDir(fsp->dptr, 0);
 342         }
 343
 344         if (in_flags & SMB2_CONTINUE_FLAG_SINGLE) {
 345                 max_count = 1;
 346         } else {
 347                 max_count = UINT16_MAX;
 348         }
 349
 350 #define DIR_ENTRY_SAFETY_MARGIN 4096
 351
 352         state->out_output_buffer = data_blob_talloc(state, NULL,
 353                         in_output_buffer_length + DIR_ENTRY_SAFETY_MARGIN);
 354         if (tevent_req_nomem(state->out_output_buffer.data, req)) {
 355                 return tevent_req_post(req, ev);
 356         }
 357
 358         state->out_output_buffer.length = 0;
 359         pdata = (char *)state->out_output_buffer.data;
 360         base_data = pdata;
 361         /*
 362          * end_data must include the safety margin as it's what is
 363          * used to determine if pushed strings have been truncated.
 364          */
 365         end_data = pdata + in_output_buffer_length + DIR_ENTRY_SAFETY_MARGIN - 1;
 366         last_entry_off = 0;
 367         off = 0;
 368         num = 0;
 369
 370         DEBUG(8,("smbd_smb2_find_send: dirpath=<%s> dontdescend=<%s>, "
 371                 "in_output_buffer_length = %u\n",
 372                 fsp->fsp_name->base_name, lp_dontdescend(SNUM(conn)),
 373                 (unsigned int)in_output_buffer_length ));
 374         if (in_list(fsp->fsp_name->base_name,lp_dontdescend(SNUM(conn)),
 375                         conn->case_sensitive)) {
 376                 dont_descend = true;
 377         }
 378
 379         ask_sharemode = lp_parm_bool(SNUM(conn),
 380                                      "smbd", "search ask sharemode",
 381                                      true);
 382
 383         while (true) {
 384                 bool ok;
 385                 bool got_exact_match = false;
 386                 bool out_of_space = false;
 387                 int space_remaining = in_output_buffer_length - off;
 388
 389                 SMB_ASSERT(space_remaining >= 0);
 390
 391                 ok = smbd_dirptr_lanman2_entry(state,
 392                                                conn,
 393                                                fsp->dptr,
 394                                                smbreq->flags2,
 395                                                in_file_name,
 396                                                dirtype,
 397                                                info_level,
 398                                                false, /* requires_resume_key */
 399                                                dont_descend,
 400                                                ask_sharemode,
 401                                                8, /* align to 8 bytes */
 402                                                false, /* no padding */
 403                                                &pdata,
 404                                                base_data,
 405                                                end_data,
 406                                                space_remaining,
 407                                                &out_of_space,
 408                                                &got_exact_match,
 409                                                &last_entry_off,
 410                                                NULL);
 411
 412                 off = (int)PTR_DIFF(pdata, base_data);
 413
 414                 if (!ok) {
 415                         if (num > 0) {
 416                                 SIVAL(state->out_output_buffer.data, last_entry_off, 0);
 417                                 tevent_req_done(req);
 418                                 return tevent_req_post(req, ev);
 419                         } else if (out_of_space) {
 420                                 tevent_req_nterror(req, NT_STATUS_INFO_LENGTH_MISMATCH);
 421                                 return tevent_req_post(req, ev);
 422                         } else {
 423                                 tevent_req_nterror(req, empty_status);
 424                                 return tevent_req_post(req, ev);
 425                         }
 426                 }
 427
 428                 num++;
 429                 state->out_output_buffer.length = off;
 430
 431                 if (num < max_count) {
 432                         continue;
 433                 }
 434
 435                 SIVAL(state->out_output_buffer.data, last_entry_off, 0);
 436                 tevent_req_done(req);
 437                 return tevent_req_post(req, ev);
 438         }
 439
 440         tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 441         return tevent_req_post(req, ev);
 442 }
 443
 444 static NTSTATUS smbd_smb2_find_recv(struct tevent_req *req,
 445                                     TALLOC_CTX *mem_ctx,
 446                                     DATA_BLOB *out_output_buffer)
 447 {
 448         NTSTATUS status;
 449         struct smbd_smb2_find_state *state = tevent_req_data(req,
 450                                              struct smbd_smb2_find_state);
 451
 452         if (tevent_req_is_nterror(req, &status)) {
 453                 tevent_req_received(req);
 454                 return status;
 455         }
 456
 457         *out_output_buffer = state->out_output_buffer;
 458         talloc_steal(mem_ctx, out_output_buffer->data);
 459
 460         tevent_req_received(req);
 461         return NT_STATUS_OK;
 462 }