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