source3/smbd/smb2_tcon.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 "../libcli/security/security.h"
  26 #include "auth.h"
  27 #include "lib/param/loadparm.h"
  28 #include "../lib/util/tevent_ntstatus.h"
  29
  30 static struct tevent_req *smbd_smb2_tree_connect_send(TALLOC_CTX *mem_ctx,
  31                                         struct tevent_context *ev,
  32                                         struct smbd_smb2_request *smb2req,
  33                                         const char *in_path);
  34 static NTSTATUS smbd_smb2_tree_connect_recv(struct tevent_req *req,
  35                                             uint8_t *out_share_type,
  36                                             uint32_t *out_share_flags,
  37                                             uint32_t *out_capabilities,
  38                                             uint32_t *out_maximal_access,
  39                                             uint32_t *out_tree_id);
  40
  41 static void smbd_smb2_request_tcon_done(struct tevent_req *subreq);
  42
  43 NTSTATUS smbd_smb2_request_process_tcon(struct smbd_smb2_request *req)
  44 {
  45         const uint8_t *inbody;
  46         uint16_t in_path_offset;
  47         uint16_t in_path_length;
  48         DATA_BLOB in_path_buffer;
  49         char *in_path_string;
  50         size_t in_path_string_size;
  51         NTSTATUS status;
  52         bool ok;
  53         struct tevent_req *subreq;
  54
  55         status = smbd_smb2_request_verify_sizes(req, 0x09);
  56         if (!NT_STATUS_IS_OK(status)) {
  57                 return smbd_smb2_request_error(req, status);
  58         }
  59         inbody = SMBD_SMB2_IN_BODY_PTR(req);
  60
  61         in_path_offset = SVAL(inbody, 0x04);
  62         in_path_length = SVAL(inbody, 0x06);
  63
  64         if (in_path_offset != (SMB2_HDR_BODY + SMBD_SMB2_IN_BODY_LEN(req))) {
  65                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  66         }
  67
  68         if (in_path_length > SMBD_SMB2_IN_DYN_LEN(req)) {
  69                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  70         }
  71
  72         in_path_buffer.data = SMBD_SMB2_IN_DYN_PTR(req);
  73         in_path_buffer.length = in_path_length;
  74
  75         ok = convert_string_talloc(req, CH_UTF16, CH_UNIX,
  76                                    in_path_buffer.data,
  77                                    in_path_buffer.length,
  78                                    &in_path_string,
  79                                    &in_path_string_size);
  80         if (!ok) {
  81                 return smbd_smb2_request_error(req, NT_STATUS_ILLEGAL_CHARACTER);
  82         }
  83
  84         if (in_path_buffer.length == 0) {
  85                 in_path_string_size = 0;
  86         }
  87
  88         if (strlen(in_path_string) != in_path_string_size) {
  89                 return smbd_smb2_request_error(req, NT_STATUS_BAD_NETWORK_NAME);
  90         }
  91
  92         subreq = smbd_smb2_tree_connect_send(req,
  93                                              req->sconn->ev_ctx,
  94                                              req,
  95                                              in_path_string);
  96         if (subreq == NULL) {
  97                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  98         }
  99         tevent_req_set_callback(subreq, smbd_smb2_request_tcon_done, req);
 100
 101         return smbd_smb2_request_pending_queue(req, subreq, 500);
 102 }
 103
 104 static void smbd_smb2_request_tcon_done(struct tevent_req *subreq)
 105 {
 106         struct smbd_smb2_request *req =
 107                 tevent_req_callback_data(subreq,
 108                 struct smbd_smb2_request);
 109         uint8_t *outhdr;
 110         DATA_BLOB outbody;
 111         uint8_t out_share_type = 0;
 112         uint32_t out_share_flags = 0;
 113         uint32_t out_capabilities = 0;
 114         uint32_t out_maximal_access = 0;
 115         uint32_t out_tree_id = 0;
 116         NTSTATUS status;
 117         NTSTATUS error;
 118
 119         status = smbd_smb2_tree_connect_recv(subreq,
 120                                              &out_share_type,
 121                                              &out_share_flags,
 122                                              &out_capabilities,
 123                                              &out_maximal_access,
 124                                              &out_tree_id);
 125         TALLOC_FREE(subreq);
 126         if (!NT_STATUS_IS_OK(status)) {
 127                 error = smbd_smb2_request_error(req, status);
 128                 if (!NT_STATUS_IS_OK(error)) {
 129                         smbd_server_connection_terminate(req->xconn,
 130                                                          nt_errstr(error));
 131                         return;
 132                 }
 133                 return;
 134         }
 135
 136         outhdr = SMBD_SMB2_OUT_HDR_PTR(req);
 137
 138         outbody = smbd_smb2_generate_outbody(req, 0x10);
 139         if (outbody.data == NULL) {
 140                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 141                 if (!NT_STATUS_IS_OK(error)) {
 142                         smbd_server_connection_terminate(req->xconn,
 143                                                          nt_errstr(error));
 144                         return;
 145                 }
 146                 return;
 147         }
 148
 149         SIVAL(outhdr, SMB2_HDR_TID, out_tree_id);
 150
 151         SSVAL(outbody.data, 0x00, 0x10);        /* struct size */
 152         SCVAL(outbody.data, 0x02,
 153               out_share_type);                  /* share type */
 154         SCVAL(outbody.data, 0x03, 0);           /* reserved */
 155         SIVAL(outbody.data, 0x04,
 156               out_share_flags);                 /* share flags */
 157         SIVAL(outbody.data, 0x08,
 158               out_capabilities);                /* capabilities */
 159         SIVAL(outbody.data, 0x0C,
 160               out_maximal_access);              /* maximal access */
 161
 162         error = smbd_smb2_request_done(req, outbody, NULL);
 163         if (!NT_STATUS_IS_OK(error)) {
 164                 smbd_server_connection_terminate(req->xconn,
 165                                                  nt_errstr(error));
 166                 return;
 167         }
 168 }
 169
 170 static NTSTATUS smbd_smb2_tree_connect(struct smbd_smb2_request *req,
 171                                        const char *in_path,
 172                                        uint8_t *out_share_type,
 173                                        uint32_t *out_share_flags,
 174                                        uint32_t *out_capabilities,
 175                                        uint32_t *out_maximal_access,
 176                                        uint32_t *out_tree_id)
 177 {
 178         struct smbXsrv_connection *conn = req->xconn;
 179         const char *share = in_path;
 180         char *service = NULL;
 181         int snum = -1;
 182         struct smbXsrv_tcon *tcon;
 183         NTTIME now = timeval_to_nttime(&req->request_time);
 184         connection_struct *compat_conn = NULL;
 185         struct user_struct *compat_vuser = req->session->compat;
 186         NTSTATUS status;
 187         bool encryption_required = req->session->global->encryption_required;
 188         bool guest_session = false;
 189
 190         if (strncmp(share, "\\\\", 2) == 0) {
 191                 const char *p = strchr(share+2, '\\');
 192                 if (p) {
 193                         share = p + 1;
 194                 }
 195         }
 196
 197         DEBUG(10,("smbd_smb2_tree_connect: path[%s] share[%s]\n",
 198                   in_path, share));
 199
 200         service = talloc_strdup(talloc_tos(), share);
 201         if(!service) {
 202                 return NT_STATUS_NO_MEMORY;
 203         }
 204
 205         if (!strlower_m(service)) {
 206                 DEBUG(2, ("strlower_m %s failed\n", service));
 207                 return NT_STATUS_INVALID_PARAMETER;
 208         }
 209
 210         /* TODO: do more things... */
 211         if (strequal(service,HOMES_NAME)) {
 212                 if (compat_vuser->homes_snum == -1) {
 213                         DEBUG(2, ("[homes] share not available for "
 214                                 "user %s because it was not found "
 215                                 "or created at session setup "
 216                                 "time\n",
 217                                 compat_vuser->session_info->unix_info->unix_name));
 218                         return NT_STATUS_BAD_NETWORK_NAME;
 219                 }
 220                 snum = compat_vuser->homes_snum;
 221         } else if ((compat_vuser->homes_snum != -1)
 222                    && strequal(service,
 223                         lp_servicename(talloc_tos(), compat_vuser->homes_snum))) {
 224                 snum = compat_vuser->homes_snum;
 225         } else {
 226                 snum = find_service(talloc_tos(), service, &service);
 227                 if (!service) {
 228                         return NT_STATUS_NO_MEMORY;
 229                 }
 230         }
 231
 232         if (snum < 0) {
 233                 DEBUG(3,("smbd_smb2_tree_connect: couldn't find service %s\n",
 234                          service));
 235                 return NT_STATUS_BAD_NETWORK_NAME;
 236         }
 237
 238         if (lp_smb_encrypt(snum) == SMB_SIGNING_REQUIRED) {
 239                 encryption_required = true;
 240         }
 241
 242         if (security_session_user_level(compat_vuser->session_info, NULL) < SECURITY_USER) {
 243                 guest_session = true;
 244         }
 245
 246         if (guest_session && encryption_required) {
 247                 DEBUG(1,("reject guest as encryption is required for service %s\n",
 248                          service));
 249                 return NT_STATUS_ACCESS_DENIED;
 250         }
 251
 252         if (conn->smb2.server.cipher == 0) {
 253                 if (encryption_required) {
 254                         DEBUG(1,("reject tcon with dialect[0x%04X] "
 255                                  "as encryption is required for service %s\n",
 256                                  conn->smb2.server.dialect, service));
 257                         return NT_STATUS_ACCESS_DENIED;
 258                 }
 259         }
 260
 261         /* create a new tcon as child of the session */
 262         status = smb2srv_tcon_create(req->session, now, &tcon);
 263         if (!NT_STATUS_IS_OK(status)) {
 264                 return status;
 265         }
 266
 267         tcon->global->encryption_required = encryption_required;
 268
 269         compat_conn = make_connection_smb2(req,
 270                                         tcon, snum,
 271                                         req->session->compat,
 272                                         "???",
 273                                         &status);
 274         if (compat_conn == NULL) {
 275                 TALLOC_FREE(tcon);
 276                 return status;
 277         }
 278
 279         tcon->global->share_name = lp_servicename(tcon->global,
 280                                                   SNUM(compat_conn));
 281         if (tcon->global->share_name == NULL) {
 282                 conn_free(compat_conn);
 283                 TALLOC_FREE(tcon);
 284                 return NT_STATUS_NO_MEMORY;
 285         }
 286         tcon->global->session_global_id =
 287                 req->session->global->session_global_id;
 288
 289         tcon->compat = talloc_move(tcon, &compat_conn);
 290
 291         tcon->status = NT_STATUS_OK;
 292
 293         status = smbXsrv_tcon_update(tcon);
 294         if (!NT_STATUS_IS_OK(status)) {
 295                 TALLOC_FREE(tcon);
 296                 return status;
 297         }
 298
 299         if (IS_PRINT(tcon->compat)) {
 300                 *out_share_type = SMB2_SHARE_TYPE_PRINT;
 301         } else if (IS_IPC(tcon->compat)) {
 302                 *out_share_type = SMB2_SHARE_TYPE_PIPE;
 303         } else {
 304                 *out_share_type = SMB2_SHARE_TYPE_DISK;
 305         }
 306
 307         *out_share_flags = 0;
 308
 309         if (lp_msdfs_root(SNUM(tcon->compat)) && lp_host_msdfs()) {
 310                 *out_share_flags |= (SMB2_SHAREFLAG_DFS|SMB2_SHAREFLAG_DFS_ROOT);
 311                 *out_capabilities = SMB2_SHARE_CAP_DFS;
 312         } else {
 313                 *out_capabilities = 0;
 314         }
 315
 316         switch(lp_csc_policy(SNUM(tcon->compat))) {
 317         case CSC_POLICY_MANUAL:
 318                 break;
 319         case CSC_POLICY_DOCUMENTS:
 320                 *out_share_flags |= SMB2_SHAREFLAG_AUTO_CACHING;
 321                 break;
 322         case CSC_POLICY_PROGRAMS:
 323                 *out_share_flags |= SMB2_SHAREFLAG_VDO_CACHING;
 324                 break;
 325         case CSC_POLICY_DISABLE:
 326                 *out_share_flags |= SMB2_SHAREFLAG_NO_CACHING;
 327                 break;
 328         default:
 329                 break;
 330         }
 331
 332         if (lp_hide_unreadable(SNUM(tcon->compat)) ||
 333             lp_hide_unwriteable_files(SNUM(tcon->compat))) {
 334                 *out_share_flags |= SMB2_SHAREFLAG_ACCESS_BASED_DIRECTORY_ENUM;
 335         }
 336
 337         if (encryption_required) {
 338                 *out_share_flags |= SMB2_SHAREFLAG_ENCRYPT_DATA;
 339         }
 340
 341         *out_maximal_access = tcon->compat->share_access;
 342
 343         *out_tree_id = tcon->global->tcon_wire_id;
 344         return NT_STATUS_OK;
 345 }
 346
 347 struct smbd_smb2_tree_connect_state {
 348         const char *in_path;
 349         uint8_t out_share_type;
 350         uint32_t out_share_flags;
 351         uint32_t out_capabilities;
 352         uint32_t out_maximal_access;
 353         uint32_t out_tree_id;
 354 };
 355
 356 static struct tevent_req *smbd_smb2_tree_connect_send(TALLOC_CTX *mem_ctx,
 357                                         struct tevent_context *ev,
 358                                         struct smbd_smb2_request *smb2req,
 359                                         const char *in_path)
 360 {
 361         struct tevent_req *req;
 362         struct smbd_smb2_tree_connect_state *state;
 363         NTSTATUS status;
 364
 365         req = tevent_req_create(mem_ctx, &state,
 366                                 struct smbd_smb2_tree_connect_state);
 367         if (req == NULL) {
 368                 return NULL;
 369         }
 370         state->in_path = in_path;
 371
 372         status = smbd_smb2_tree_connect(smb2req,
 373                                         state->in_path,
 374                                         &state->out_share_type,
 375                                         &state->out_share_flags,
 376                                         &state->out_capabilities,
 377                                         &state->out_maximal_access,
 378                                         &state->out_tree_id);
 379         if (tevent_req_nterror(req, status)) {
 380                 return tevent_req_post(req, ev);
 381         }
 382
 383         tevent_req_done(req);
 384         return tevent_req_post(req, ev);
 385 }
 386
 387 static NTSTATUS smbd_smb2_tree_connect_recv(struct tevent_req *req,
 388                                             uint8_t *out_share_type,
 389                                             uint32_t *out_share_flags,
 390                                             uint32_t *out_capabilities,
 391                                             uint32_t *out_maximal_access,
 392                                             uint32_t *out_tree_id)
 393 {
 394         struct smbd_smb2_tree_connect_state *state =
 395                 tevent_req_data(req,
 396                 struct smbd_smb2_tree_connect_state);
 397         NTSTATUS status;
 398
 399         if (tevent_req_is_nterror(req, &status)) {
 400                 tevent_req_received(req);
 401                 return status;
 402         }
 403
 404         *out_share_type = state->out_share_type;
 405         *out_share_flags = state->out_share_flags;
 406         *out_capabilities = state->out_capabilities;
 407         *out_maximal_access = state->out_maximal_access;
 408         *out_tree_id = state->out_tree_id;
 409
 410         tevent_req_received(req);
 411         return NT_STATUS_OK;
 412 }
 413
 414 static struct tevent_req *smbd_smb2_tdis_send(TALLOC_CTX *mem_ctx,
 415                                         struct tevent_context *ev,
 416                                         struct smbd_smb2_request *smb2req);
 417 static NTSTATUS smbd_smb2_tdis_recv(struct tevent_req *req);
 418 static void smbd_smb2_request_tdis_done(struct tevent_req *subreq);
 419
 420 NTSTATUS smbd_smb2_request_process_tdis(struct smbd_smb2_request *req)
 421 {
 422         NTSTATUS status;
 423         struct tevent_req *subreq = NULL;
 424
 425         status = smbd_smb2_request_verify_sizes(req, 0x04);
 426         if (!NT_STATUS_IS_OK(status)) {
 427                 return smbd_smb2_request_error(req, status);
 428         }
 429
 430         subreq = smbd_smb2_tdis_send(req, req->sconn->ev_ctx, req);
 431         if (subreq == NULL) {
 432                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 433         }
 434         tevent_req_set_callback(subreq, smbd_smb2_request_tdis_done, req);
 435
 436         /*
 437          * Wait a long time before going async on this to allow
 438          * requests we're waiting on to finish. Set timeout to 10 secs.
 439          */
 440         return smbd_smb2_request_pending_queue(req, subreq, 10000000);
 441 }
 442
 443 static void smbd_smb2_request_tdis_done(struct tevent_req *subreq)
 444 {
 445         struct smbd_smb2_request *smb2req =
 446                 tevent_req_callback_data(subreq,
 447                 struct smbd_smb2_request);
 448         DATA_BLOB outbody;
 449         NTSTATUS status;
 450         NTSTATUS error;
 451
 452         status = smbd_smb2_tdis_recv(subreq);
 453         TALLOC_FREE(subreq);
 454         if (!NT_STATUS_IS_OK(status)) {
 455                 error = smbd_smb2_request_error(smb2req, status);
 456                 if (!NT_STATUS_IS_OK(error)) {
 457                         smbd_server_connection_terminate(smb2req->xconn,
 458                                                         nt_errstr(error));
 459                         return;
 460                 }
 461                 return;
 462         }
 463
 464         outbody = smbd_smb2_generate_outbody(smb2req, 0x04);
 465         if (outbody.data == NULL) {
 466                 error = smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 467                 if (!NT_STATUS_IS_OK(error)) {
 468                         smbd_server_connection_terminate(smb2req->xconn,
 469                                                         nt_errstr(error));
 470                         return;
 471                 }
 472                 return;
 473         }
 474
 475         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 476         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 477
 478         error = smbd_smb2_request_done(smb2req, outbody, NULL);
 479         if (!NT_STATUS_IS_OK(error)) {
 480                 smbd_server_connection_terminate(smb2req->xconn,
 481                                                 nt_errstr(error));
 482                 return;
 483         }
 484 }
 485
 486 struct smbd_smb2_tdis_state {
 487         struct smbd_smb2_request *smb2req;
 488         struct tevent_queue *wait_queue;
 489 };
 490
 491 static void smbd_smb2_tdis_wait_done(struct tevent_req *subreq);
 492
 493 static struct tevent_req *smbd_smb2_tdis_send(TALLOC_CTX *mem_ctx,
 494                                         struct tevent_context *ev,
 495                                         struct smbd_smb2_request *smb2req)
 496 {
 497         struct tevent_req *req;
 498         struct smbd_smb2_tdis_state *state;
 499         struct tevent_req *subreq;
 500         struct smbd_smb2_request *preq;
 501         struct smbXsrv_connection *xconn = smb2req->xconn;
 502
 503         req = tevent_req_create(mem_ctx, &state,
 504                         struct smbd_smb2_tdis_state);
 505         if (req == NULL) {
 506                 return NULL;
 507         }
 508         state->smb2req = smb2req;
 509
 510         state->wait_queue = tevent_queue_create(state, "tdis_wait_queue");
 511         if (tevent_req_nomem(state->wait_queue, req)) {
 512                 return tevent_req_post(req, ev);
 513         }
 514
 515         /*
 516          * Make sure that no new request will be able to use this tcon.
 517          */
 518         smb2req->tcon->status = NT_STATUS_NETWORK_NAME_DELETED;
 519
 520         for (preq = xconn->smb2.requests; preq != NULL; preq = preq->next) {
 521                 if (preq == smb2req) {
 522                         /* Can't cancel current request. */
 523                         continue;
 524                 }
 525                 if (preq->tcon != smb2req->tcon) {
 526                         /* Request on different tcon. */
 527                         continue;
 528                 }
 529
 530                 /*
 531                  * Never cancel anything in a compound
 532                  * request. Way too hard to deal with
 533                  * the result.
 534                  */
 535                 if (!preq->compound_related && preq->subreq != NULL) {
 536                         tevent_req_cancel(preq->subreq);
 537                 }
 538
 539                 /*
 540                  * Now wait until the request is finished.
 541                  *
 542                  * We don't set a callback, as we just want to block the
 543                  * wait queue and the talloc_free() of the request will
 544                  * remove the item from the wait queue.
 545                  */
 546                 subreq = tevent_queue_wait_send(preq, ev, state->wait_queue);
 547                 if (tevent_req_nomem(subreq, req)) {
 548                         return tevent_req_post(req, ev);
 549                 }
 550         }
 551
 552         /*
 553          * Now we add our own waiter to the end of the queue,
 554          * this way we get notified when all pending requests are finished
 555          * and send to the socket.
 556          */
 557         subreq = tevent_queue_wait_send(state, ev, state->wait_queue);
 558         if (tevent_req_nomem(subreq, req)) {
 559                 return tevent_req_post(req, ev);
 560         }
 561         tevent_req_set_callback(subreq, smbd_smb2_tdis_wait_done, req);
 562
 563         return req;
 564 }
 565
 566 static void smbd_smb2_tdis_wait_done(struct tevent_req *subreq)
 567 {
 568         struct tevent_req *req = tevent_req_callback_data(
 569                 subreq, struct tevent_req);
 570         struct smbd_smb2_tdis_state *state = tevent_req_data(
 571                 req, struct smbd_smb2_tdis_state);
 572         NTSTATUS status;
 573
 574         tevent_queue_wait_recv(subreq);
 575         TALLOC_FREE(subreq);
 576
 577         /*
 578          * As we've been awoken, we may have changed
 579          * uid in the meantime. Ensure we're still
 580          * root (SMB2_OP_TDIS has .as_root = true).
 581          */
 582         change_to_root_user();
 583
 584         status = smbXsrv_tcon_disconnect(state->smb2req->tcon,
 585                                          state->smb2req->tcon->compat->vuid);
 586         if (tevent_req_nterror(req, status)) {
 587                 return;
 588         }
 589
 590         /* We did tear down the tcon. */
 591         TALLOC_FREE(state->smb2req->tcon);
 592         tevent_req_done(req);
 593 }
 594
 595 static NTSTATUS smbd_smb2_tdis_recv(struct tevent_req *req)
 596 {
 597         return tevent_req_simple_recv_ntstatus(req);
 598 }