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