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         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         struct files_struct *in_fsp;
  52         uint16_t in_file_name_offset;
  53         uint16_t in_file_name_length;
  54         DATA_BLOB in_file_name_buffer;
  55         char *in_file_name_string;
  56         size_t in_file_name_string_size;
  57         uint32_t in_output_buffer_length;
  58         struct tevent_req *subreq;
  59         bool ok;
  60
  61         status = smbd_smb2_request_verify_sizes(req, 0x21);
  62         if (!NT_STATUS_IS_OK(status)) {
  63                 return smbd_smb2_request_error(req, status);
  64         }
  65         inbody = SMBD_SMB2_IN_BODY_PTR(req);
  66
  67         in_file_info_class              = CVAL(inbody, 0x02);
  68         in_flags                        = CVAL(inbody, 0x03);
  69         in_file_index                   = IVAL(inbody, 0x04);
  70         in_file_id_persistent           = BVAL(inbody, 0x08);
  71         in_file_id_volatile             = BVAL(inbody, 0x10);
  72         in_file_name_offset             = SVAL(inbody, 0x18);
  73         in_file_name_length             = SVAL(inbody, 0x1A);
  74         in_output_buffer_length         = IVAL(inbody, 0x1C);
  75
  76         if (in_file_name_offset == 0 && in_file_name_length == 0) {
  77                 /* This is ok */
  78         } else if (in_file_name_offset !=
  79                    (SMB2_HDR_BODY + SMBD_SMB2_IN_BODY_LEN(req))) {
  80                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  81         }
  82
  83         if (in_file_name_length > SMBD_SMB2_IN_DYN_LEN(req)) {
  84                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  85         }
  86
  87         /* The output header is 8 bytes. */
  88         if (in_output_buffer_length <= 8) {
  89                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  90         }
  91
  92         DEBUG(10,("smbd_smb2_request_find_done: in_output_buffer_length = %u\n",
  93                 (unsigned int)in_output_buffer_length ));
  94
  95         /* Take into account the output header. */
  96         in_output_buffer_length -= 8;
  97
  98         in_file_name_buffer.data = SMBD_SMB2_IN_DYN_PTR(req);
  99         in_file_name_buffer.length = in_file_name_length;
 100
 101         ok = convert_string_talloc(req, CH_UTF16, CH_UNIX,
 102                                    in_file_name_buffer.data,
 103                                    in_file_name_buffer.length,
 104                                    &in_file_name_string,
 105                                    &in_file_name_string_size);
 106         if (!ok) {
 107                 return smbd_smb2_request_error(req, NT_STATUS_ILLEGAL_CHARACTER);
 108         }
 109
 110         if (in_file_name_buffer.length == 0) {
 111                 in_file_name_string_size = 0;
 112         }
 113
 114         if (strlen(in_file_name_string) != in_file_name_string_size) {
 115                 return smbd_smb2_request_error(req, NT_STATUS_OBJECT_NAME_INVALID);
 116         }
 117
 118         in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
 119         if (in_fsp == NULL) {
 120                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
 121         }
 122
 123         subreq = smbd_smb2_find_send(req, req->sconn->ev_ctx,
 124                                      req, in_fsp,
 125                                      in_file_info_class,
 126                                      in_flags,
 127                                      in_file_index,
 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, 500);
 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         DATA_BLOB outbody;
 143         DATA_BLOB outdyn;
 144         uint16_t out_output_buffer_offset;
 145         DATA_BLOB out_output_buffer = data_blob_null;
 146         NTSTATUS status;
 147         NTSTATUS error; /* transport error */
 148
 149         status = smbd_smb2_find_recv(subreq,
 150                                      req,
 151                                      &out_output_buffer);
 152         TALLOC_FREE(subreq);
 153         if (!NT_STATUS_IS_OK(status)) {
 154                 error = smbd_smb2_request_error(req, status);
 155                 if (!NT_STATUS_IS_OK(error)) {
 156                         smbd_server_connection_terminate(req->sconn,
 157                                                          nt_errstr(error));
 158                         return;
 159                 }
 160                 return;
 161         }
 162
 163         out_output_buffer_offset = SMB2_HDR_BODY + 0x08;
 164
 165         outbody = data_blob_talloc(req->out.vector, NULL, 0x08);
 166         if (outbody.data == NULL) {
 167                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 168                 if (!NT_STATUS_IS_OK(error)) {
 169                         smbd_server_connection_terminate(req->sconn,
 170                                                          nt_errstr(error));
 171                         return;
 172                 }
 173                 return;
 174         }
 175
 176         SSVAL(outbody.data, 0x00, 0x08 + 1);    /* struct size */
 177         SSVAL(outbody.data, 0x02,
 178               out_output_buffer_offset);        /* output buffer offset */
 179         SIVAL(outbody.data, 0x04,
 180               out_output_buffer.length);        /* output buffer length */
 181
 182         DEBUG(10,("smbd_smb2_request_find_done: out_output_buffer.length = %u\n",
 183                 (unsigned int)out_output_buffer.length ));
 184
 185         outdyn = out_output_buffer;
 186
 187         error = smbd_smb2_request_done(req, outbody, &outdyn);
 188         if (!NT_STATUS_IS_OK(error)) {
 189                 smbd_server_connection_terminate(req->sconn,
 190                                                  nt_errstr(error));
 191                 return;
 192         }
 193 }
 194
 195 struct smbd_smb2_find_state {
 196         struct smbd_smb2_request *smb2req;
 197         DATA_BLOB out_output_buffer;
 198 };
 199
 200 static struct tevent_req *smbd_smb2_find_send(TALLOC_CTX *mem_ctx,
 201                                               struct tevent_context *ev,
 202                                               struct smbd_smb2_request *smb2req,
 203                                               struct files_struct *fsp,
 204                                               uint8_t in_file_info_class,
 205                                               uint8_t in_flags,
 206                                               uint32_t in_file_index,
 207                                               uint32_t in_output_buffer_length,
 208                                               const char *in_file_name)
 209 {
 210         struct tevent_req *req;
 211         struct smbd_smb2_find_state *state;
 212         struct smb_request *smbreq;
 213         connection_struct *conn = smb2req->tcon->compat;
 214         NTSTATUS status;
 215         NTSTATUS empty_status;
 216         uint32_t info_level;
 217         uint32_t max_count;
 218         char *pdata;
 219         char *base_data;
 220         char *end_data;
 221         int last_entry_off = 0;
 222         int off = 0;
 223         uint32_t num = 0;
 224         uint32_t dirtype = FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM | FILE_ATTRIBUTE_DIRECTORY;
 225         bool dont_descend = false;
 226         bool ask_sharemode = true;
 227
 228         req = tevent_req_create(mem_ctx, &state,
 229                                 struct smbd_smb2_find_state);
 230         if (req == NULL) {
 231                 return NULL;
 232         }
 233         state->smb2req = smb2req;
 234         state->out_output_buffer = data_blob_null;
 235
 236         DEBUG(10,("smbd_smb2_find_send: %s - %s\n",
 237                   fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
 238
 239         smbreq = smbd_smb2_fake_smb_request(smb2req);
 240         if (tevent_req_nomem(smbreq, req)) {
 241                 return tevent_req_post(req, ev);
 242         }
 243
 244         if (!fsp->is_directory) {
 245                 tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
 246                 return tevent_req_post(req, ev);
 247         }
 248
 249         if (strcmp(in_file_name, "") == 0) {
 250                 tevent_req_nterror(req, NT_STATUS_OBJECT_NAME_INVALID);
 251                 return tevent_req_post(req, ev);
 252         }
 253         if (strcmp(in_file_name, "\\") == 0) {
 254                 tevent_req_nterror(req, NT_STATUS_OBJECT_NAME_INVALID);
 255                 return tevent_req_post(req, ev);
 256         }
 257         if (strcmp(in_file_name, "/") == 0) {
 258                 tevent_req_nterror(req, NT_STATUS_OBJECT_NAME_INVALID);
 259                 return tevent_req_post(req, ev);
 260         }
 261
 262         if (in_output_buffer_length > smb2req->sconn->smb2.max_trans) {
 263                 DEBUG(2,("smbd_smb2_find_send: "
 264                          "client ignored max trans:%s: 0x%08X: 0x%08X\n",
 265                          __location__, in_output_buffer_length,
 266                          smb2req->sconn->smb2.max_trans));
 267                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 268                 return tevent_req_post(req, ev);
 269         }
 270
 271         status = smbd_smb2_request_verify_creditcharge(smb2req,
 272                                         in_output_buffer_length);
 273
 274         if (!NT_STATUS_IS_OK(status)) {
 275                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 276                 return tevent_req_post(req, ev);
 277         }
 278
 279         switch (in_file_info_class) {
 280         case SMB2_FIND_DIRECTORY_INFO:
 281                 info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 282                 break;
 283
 284         case SMB2_FIND_FULL_DIRECTORY_INFO:
 285                 info_level = SMB_FIND_FILE_FULL_DIRECTORY_INFO;
 286                 break;
 287
 288         case SMB2_FIND_BOTH_DIRECTORY_INFO:
 289                 info_level = SMB_FIND_FILE_BOTH_DIRECTORY_INFO;
 290                 break;
 291
 292         case SMB2_FIND_NAME_INFO:
 293                 info_level = SMB_FIND_FILE_NAMES_INFO;
 294                 break;
 295
 296         case SMB2_FIND_ID_BOTH_DIRECTORY_INFO:
 297                 info_level = SMB_FIND_ID_BOTH_DIRECTORY_INFO;
 298                 break;
 299
 300         case SMB2_FIND_ID_FULL_DIRECTORY_INFO:
 301                 info_level = SMB_FIND_ID_FULL_DIRECTORY_INFO;
 302                 break;
 303
 304         default:
 305                 tevent_req_nterror(req, NT_STATUS_INVALID_INFO_CLASS);
 306                 return tevent_req_post(req, ev);
 307         }
 308
 309         if (in_flags & SMB2_CONTINUE_FLAG_REOPEN) {
 310                 dptr_CloseDir(fsp);
 311         }
 312
 313         if (fsp->dptr == NULL) {
 314                 bool wcard_has_wild;
 315
 316                 wcard_has_wild = ms_has_wild(in_file_name);
 317
 318                 status = dptr_create(conn,
 319                                      NULL, /* req */
 320                                      fsp,
 321                                      fsp->fsp_name->base_name,
 322                                      false, /* old_handle */
 323                                      false, /* expect_close */
 324                                      0, /* spid */
 325                                      in_file_name, /* wcard */
 326                                      wcard_has_wild,
 327                                      dirtype,
 328                                      &fsp->dptr);
 329                 if (!NT_STATUS_IS_OK(status)) {
 330                         tevent_req_nterror(req, status);
 331                         return tevent_req_post(req, ev);
 332                 }
 333
 334                 empty_status = NT_STATUS_NO_SUCH_FILE;
 335         } else {
 336                 empty_status = STATUS_NO_MORE_FILES;
 337         }
 338
 339         if (in_flags & SMB2_CONTINUE_FLAG_RESTART) {
 340                 dptr_SeekDir(fsp->dptr, 0);
 341         }
 342
 343         if (in_flags & SMB2_CONTINUE_FLAG_SINGLE) {
 344                 max_count = 1;
 345         } else {
 346                 max_count = UINT16_MAX;
 347         }
 348
 349 #define DIR_ENTRY_SAFETY_MARGIN 4096
 350
 351         state->out_output_buffer = data_blob_talloc(state, NULL,
 352                         in_output_buffer_length + DIR_ENTRY_SAFETY_MARGIN);
 353         if (tevent_req_nomem(state->out_output_buffer.data, req)) {
 354                 return tevent_req_post(req, ev);
 355         }
 356
 357         state->out_output_buffer.length = 0;
 358         pdata = (char *)state->out_output_buffer.data;
 359         base_data = pdata;
 360         /*
 361          * end_data must include the safety margin as it's what is
 362          * used to determine if pushed strings have been truncated.
 363          */
 364         end_data = pdata + in_output_buffer_length + DIR_ENTRY_SAFETY_MARGIN - 1;
 365         last_entry_off = 0;
 366         off = 0;
 367         num = 0;
 368
 369         DEBUG(8,("smbd_smb2_find_send: dirpath=<%s> dontdescend=<%s>, "
 370                 "in_output_buffer_length = %u\n",
 371                 fsp->fsp_name->base_name, lp_dontdescend(talloc_tos(), SNUM(conn)),
 372                 (unsigned int)in_output_buffer_length ));
 373         if (in_list(fsp->fsp_name->base_name,lp_dontdescend(talloc_tos(), SNUM(conn)),
 374                         conn->case_sensitive)) {
 375                 dont_descend = true;
 376         }
 377
 378         ask_sharemode = lp_parm_bool(SNUM(conn),
 379                                      "smbd", "search ask sharemode",
 380                                      true);
 381
 382         while (true) {
 383                 bool ok;
 384                 bool got_exact_match = false;
 385                 bool out_of_space = false;
 386                 int space_remaining = in_output_buffer_length - off;
 387
 388                 SMB_ASSERT(space_remaining >= 0);
 389
 390                 ok = smbd_dirptr_lanman2_entry(state,
 391                                                conn,
 392                                                fsp->dptr,
 393                                                smbreq->flags2,
 394                                                in_file_name,
 395                                                dirtype,
 396                                                info_level,
 397                                                false, /* requires_resume_key */
 398                                                dont_descend,
 399                                                ask_sharemode,
 400                                                8, /* align to 8 bytes */
 401                                                false, /* no padding */
 402                                                &pdata,
 403                                                base_data,
 404                                                end_data,
 405                                                space_remaining,
 406                                                &out_of_space,
 407                                                &got_exact_match,
 408                                                &last_entry_off,
 409                                                NULL);
 410
 411                 off = (int)PTR_DIFF(pdata, base_data);
 412
 413                 if (!ok) {
 414                         if (num > 0) {
 415                                 SIVAL(state->out_output_buffer.data, last_entry_off, 0);
 416                                 tevent_req_done(req);
 417                                 return tevent_req_post(req, ev);
 418                         } else if (out_of_space) {
 419                                 tevent_req_nterror(req, NT_STATUS_INFO_LENGTH_MISMATCH);
 420                                 return tevent_req_post(req, ev);
 421                         } else {
 422                                 tevent_req_nterror(req, empty_status);
 423                                 return tevent_req_post(req, ev);
 424                         }
 425                 }
 426
 427                 num++;
 428                 state->out_output_buffer.length = off;
 429
 430                 if (num < max_count) {
 431                         continue;
 432                 }
 433
 434                 SIVAL(state->out_output_buffer.data, last_entry_off, 0);
 435                 tevent_req_done(req);
 436                 return tevent_req_post(req, ev);
 437         }
 438
 439         tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 440         return tevent_req_post(req, ev);
 441 }
 442
 443 static NTSTATUS smbd_smb2_find_recv(struct tevent_req *req,
 444                                     TALLOC_CTX *mem_ctx,
 445                                     DATA_BLOB *out_output_buffer)
 446 {
 447         NTSTATUS status;
 448         struct smbd_smb2_find_state *state = tevent_req_data(req,
 449                                              struct smbd_smb2_find_state);
 450
 451         if (tevent_req_is_nterror(req, &status)) {
 452                 tevent_req_received(req);
 453                 return status;
 454         }
 455
 456         *out_output_buffer = state->out_output_buffer;
 457         talloc_steal(mem_ctx, out_output_buffer->data);
 458
 459         tevent_req_received(req);
 460         return NT_STATUS_OK;
 461 }