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, false);
 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->smb2.event_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);
 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         int i = req->current_idx;
 144         uint8_t *outhdr;
 145         DATA_BLOB outbody;
 146         DATA_BLOB outdyn;
 147         uint16_t out_output_buffer_offset;
 148         DATA_BLOB out_output_buffer = data_blob_null;
 149         NTSTATUS status;
 150         NTSTATUS error; /* transport error */
 151
 152         status = smbd_smb2_find_recv(subreq,
 153                                      req,
 154                                      &out_output_buffer);
 155         TALLOC_FREE(subreq);
 156         if (!NT_STATUS_IS_OK(status)) {
 157                 error = smbd_smb2_request_error(req, status);
 158                 if (!NT_STATUS_IS_OK(error)) {
 159                         smbd_server_connection_terminate(req->sconn,
 160                                                          nt_errstr(error));
 161                         return;
 162                 }
 163                 return;
 164         }
 165
 166         out_output_buffer_offset = SMB2_HDR_BODY + 0x08;
 167
 168         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 169
 170         outbody = data_blob_talloc(req->out.vector, NULL, 0x08);
 171         if (outbody.data == NULL) {
 172                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 173                 if (!NT_STATUS_IS_OK(error)) {
 174                         smbd_server_connection_terminate(req->sconn,
 175                                                          nt_errstr(error));
 176                         return;
 177                 }
 178                 return;
 179         }
 180
 181         SSVAL(outbody.data, 0x00, 0x08 + 1);    /* struct size */
 182         SSVAL(outbody.data, 0x02,
 183               out_output_buffer_offset);        /* output buffer offset */
 184         SIVAL(outbody.data, 0x04,
 185               out_output_buffer.length);        /* output buffer length */
 186
 187         DEBUG(10,("smbd_smb2_request_find_done: out_output_buffer.length = %u\n",
 188                 (unsigned int)out_output_buffer.length ));
 189
 190         outdyn = out_output_buffer;
 191
 192         error = smbd_smb2_request_done(req, outbody, &outdyn);
 193         if (!NT_STATUS_IS_OK(error)) {
 194                 smbd_server_connection_terminate(req->sconn,
 195                                                  nt_errstr(error));
 196                 return;
 197         }
 198 }
 199
 200 struct smbd_smb2_find_state {
 201         struct smbd_smb2_request *smb2req;
 202         DATA_BLOB out_output_buffer;
 203 };
 204
 205 static struct tevent_req *smbd_smb2_find_send(TALLOC_CTX *mem_ctx,
 206                                               struct tevent_context *ev,
 207                                               struct smbd_smb2_request *smb2req,
 208                                               struct files_struct *fsp,
 209                                               uint8_t in_file_info_class,
 210                                               uint8_t in_flags,
 211                                               uint32_t in_file_index,
 212                                               uint32_t in_output_buffer_length,
 213                                               const char *in_file_name)
 214 {
 215         struct tevent_req *req;
 216         struct smbd_smb2_find_state *state;
 217         struct smb_request *smbreq;
 218         connection_struct *conn = smb2req->tcon->compat_conn;
 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 = FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM | FILE_ATTRIBUTE_DIRECTORY;
 230         bool dont_descend = false;
 231         bool ask_sharemode = true;
 232
 233         req = tevent_req_create(mem_ctx, &state,
 234                                 struct smbd_smb2_find_state);
 235         if (req == NULL) {
 236                 return NULL;
 237         }
 238         state->smb2req = smb2req;
 239         state->out_output_buffer = data_blob_null;
 240
 241         DEBUG(10,("smbd_smb2_find_send: %s - fnum[%d]\n",
 242                   fsp_str_dbg(fsp), fsp->fnum));
 243
 244         smbreq = smbd_smb2_fake_smb_request(smb2req);
 245         if (tevent_req_nomem(smbreq, req)) {
 246                 return tevent_req_post(req, ev);
 247         }
 248
 249         if (!fsp->is_directory) {
 250                 tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
 251                 return tevent_req_post(req, ev);
 252         }
 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         if (strcmp(in_file_name, "/") == 0) {
 263                 tevent_req_nterror(req, NT_STATUS_OBJECT_NAME_INVALID);
 264                 return tevent_req_post(req, ev);
 265         }
 266
 267         if (in_output_buffer_length > smb2req->sconn->smb2.max_trans) {
 268                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 269                 return tevent_req_post(req, ev);
 270         }
 271
 272         switch (in_file_info_class) {
 273         case SMB2_FIND_DIRECTORY_INFO:
 274                 info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 275                 break;
 276
 277         case SMB2_FIND_FULL_DIRECTORY_INFO:
 278                 info_level = SMB_FIND_FILE_FULL_DIRECTORY_INFO;
 279                 break;
 280
 281         case SMB2_FIND_BOTH_DIRECTORY_INFO:
 282                 info_level = SMB_FIND_FILE_BOTH_DIRECTORY_INFO;
 283                 break;
 284
 285         case SMB2_FIND_NAME_INFO:
 286                 info_level = SMB_FIND_FILE_NAMES_INFO;
 287                 break;
 288
 289         case SMB2_FIND_ID_BOTH_DIRECTORY_INFO:
 290                 info_level = SMB_FIND_ID_BOTH_DIRECTORY_INFO;
 291                 break;
 292
 293         case SMB2_FIND_ID_FULL_DIRECTORY_INFO:
 294                 info_level = SMB_FIND_ID_FULL_DIRECTORY_INFO;
 295                 break;
 296
 297         default:
 298                 tevent_req_nterror(req, NT_STATUS_INVALID_INFO_CLASS);
 299                 return tevent_req_post(req, ev);
 300         }
 301
 302         if (in_flags & SMB2_CONTINUE_FLAG_REOPEN) {
 303                 dptr_CloseDir(fsp);
 304         }
 305
 306         if (fsp->dptr == NULL) {
 307                 bool wcard_has_wild;
 308
 309                 if (!(fsp->access_mask & SEC_DIR_LIST)) {
 310                         tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 311                         return tevent_req_post(req, ev);
 312                 }
 313
 314                 wcard_has_wild = ms_has_wild(in_file_name);
 315
 316                 status = dptr_create(conn,
 317                                      fsp,
 318                                      fsp->fsp_name->base_name,
 319                                      false, /* old_handle */
 320                                      false, /* expect_close */
 321                                      0, /* spid */
 322                                      in_file_name, /* wcard */
 323                                      wcard_has_wild,
 324                                      dirtype,
 325                                      &fsp->dptr);
 326                 if (!NT_STATUS_IS_OK(status)) {
 327                         tevent_req_nterror(req, status);
 328                         return tevent_req_post(req, ev);
 329                 }
 330
 331                 empty_status = NT_STATUS_NO_SUCH_FILE;
 332         } else {
 333                 empty_status = STATUS_NO_MORE_FILES;
 334         }
 335
 336         if (in_flags & SMB2_CONTINUE_FLAG_RESTART) {
 337                 dptr_SeekDir(fsp->dptr, 0);
 338         }
 339
 340         if (in_flags & SMB2_CONTINUE_FLAG_SINGLE) {
 341                 max_count = 1;
 342         } else {
 343                 max_count = UINT16_MAX;
 344         }
 345
 346 #define DIR_ENTRY_SAFETY_MARGIN 4096
 347
 348         state->out_output_buffer = data_blob_talloc(state, NULL,
 349                         in_output_buffer_length + DIR_ENTRY_SAFETY_MARGIN);
 350         if (tevent_req_nomem(state->out_output_buffer.data, req)) {
 351                 return tevent_req_post(req, ev);
 352         }
 353
 354         state->out_output_buffer.length = 0;
 355         pdata = (char *)state->out_output_buffer.data;
 356         base_data = pdata;
 357         /*
 358          * end_data must include the safety margin as it's what is
 359          * used to determine if pushed strings have been truncated.
 360          */
 361         end_data = pdata + in_output_buffer_length + DIR_ENTRY_SAFETY_MARGIN - 1;
 362         last_entry_off = 0;
 363         off = 0;
 364         num = 0;
 365
 366         DEBUG(8,("smbd_smb2_find_send: dirpath=<%s> dontdescend=<%s>, "
 367                 "in_output_buffer_length = %u\n",
 368                 fsp->fsp_name->base_name, lp_dontdescend(SNUM(conn)),
 369                 (unsigned int)in_output_buffer_length ));
 370         if (in_list(fsp->fsp_name->base_name,lp_dontdescend(SNUM(conn)),
 371                         conn->case_sensitive)) {
 372                 dont_descend = true;
 373         }
 374
 375         ask_sharemode = lp_parm_bool(SNUM(conn),
 376                                      "smbd", "search ask sharemode",
 377                                      true);
 378
 379         while (true) {
 380                 bool ok;
 381                 bool got_exact_match = false;
 382                 bool out_of_space = false;
 383                 int space_remaining = in_output_buffer_length - off;
 384
 385                 SMB_ASSERT(space_remaining >= 0);
 386
 387                 ok = smbd_dirptr_lanman2_entry(state,
 388                                                conn,
 389                                                fsp->dptr,
 390                                                smbreq->flags2,
 391                                                in_file_name,
 392                                                dirtype,
 393                                                info_level,
 394                                                false, /* requires_resume_key */
 395                                                dont_descend,
 396                                                ask_sharemode,
 397                                                8, /* align to 8 bytes */
 398                                                false, /* no padding */
 399                                                &pdata,
 400                                                base_data,
 401                                                end_data,
 402                                                space_remaining,
 403                                                &out_of_space,
 404                                                &got_exact_match,
 405                                                &last_entry_off,
 406                                                NULL);
 407
 408                 off = (int)PTR_DIFF(pdata, base_data);
 409
 410                 if (!ok) {
 411                         if (num > 0) {
 412                                 SIVAL(state->out_output_buffer.data, last_entry_off, 0);
 413                                 tevent_req_done(req);
 414                                 return tevent_req_post(req, ev);
 415                         } else if (out_of_space) {
 416                                 tevent_req_nterror(req, NT_STATUS_INFO_LENGTH_MISMATCH);
 417                                 return tevent_req_post(req, ev);
 418                         } else {
 419                                 tevent_req_nterror(req, empty_status);
 420                                 return tevent_req_post(req, ev);
 421                         }
 422                 }
 423
 424                 num++;
 425                 state->out_output_buffer.length = off;
 426
 427                 if (num < max_count) {
 428                         continue;
 429                 }
 430
 431                 SIVAL(state->out_output_buffer.data, last_entry_off, 0);
 432                 tevent_req_done(req);
 433                 return tevent_req_post(req, ev);
 434         }
 435
 436         tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 437         return tevent_req_post(req, ev);
 438 }
 439
 440 static NTSTATUS smbd_smb2_find_recv(struct tevent_req *req,
 441                                     TALLOC_CTX *mem_ctx,
 442                                     DATA_BLOB *out_output_buffer)
 443 {
 444         NTSTATUS status;
 445         struct smbd_smb2_find_state *state = tevent_req_data(req,
 446                                              struct smbd_smb2_find_state);
 447
 448         if (tevent_req_is_nterror(req, &status)) {
 449                 tevent_req_received(req);
 450                 return status;
 451         }
 452
 453         *out_output_buffer = state->out_output_buffer;
 454         talloc_steal(mem_ctx, out_output_buffer->data);
 455
 456         tevent_req_received(req);
 457         return NT_STATUS_OK;
 458 }