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         int i = req->current_idx;
  47         uint16_t in_path_offset;
  48         uint16_t in_path_length;
  49         DATA_BLOB in_path_buffer;
  50         char *in_path_string;
  51         size_t in_path_string_size;
  52         NTSTATUS status;
  53         bool ok;
  54         struct tevent_req *subreq;
  55
  56         status = smbd_smb2_request_verify_sizes(req, 0x09);
  57         if (!NT_STATUS_IS_OK(status)) {
  58                 return smbd_smb2_request_error(req, status);
  59         }
  60         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  61
  62         in_path_offset = SVAL(inbody, 0x04);
  63         in_path_length = SVAL(inbody, 0x06);
  64
  65         if (in_path_offset != (SMB2_HDR_BODY + req->in.vector[i+1].iov_len)) {
  66                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  67         }
  68
  69         if (in_path_length > req->in.vector[i+2].iov_len) {
  70                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  71         }
  72
  73         in_path_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
  74         in_path_buffer.length = in_path_length;
  75
  76         ok = convert_string_talloc(req, CH_UTF16, CH_UNIX,
  77                                    in_path_buffer.data,
  78                                    in_path_buffer.length,
  79                                    &in_path_string,
  80                                    &in_path_string_size);
  81         if (!ok) {
  82                 return smbd_smb2_request_error(req, NT_STATUS_ILLEGAL_CHARACTER);
  83         }
  84
  85         if (in_path_buffer.length == 0) {
  86                 in_path_string_size = 0;
  87         }
  88
  89         if (strlen(in_path_string) != in_path_string_size) {
  90                 return smbd_smb2_request_error(req, NT_STATUS_BAD_NETWORK_NAME);
  91         }
  92
  93         subreq = smbd_smb2_tree_connect_send(req,
  94                                              req->sconn->ev_ctx,
  95                                              req,
  96                                              in_path_string);
  97         if (subreq == NULL) {
  98                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  99         }
 100         tevent_req_set_callback(subreq, smbd_smb2_request_tcon_done, req);
 101
 102         return smbd_smb2_request_pending_queue(req, subreq, 500);
 103 }
 104
 105 static void smbd_smb2_request_tcon_done(struct tevent_req *subreq)
 106 {
 107         struct smbd_smb2_request *req =
 108                 tevent_req_callback_data(subreq,
 109                 struct smbd_smb2_request);
 110         int i = req->current_idx;
 111         uint8_t *outhdr;
 112         DATA_BLOB outbody;
 113         uint8_t out_share_type = 0;
 114         uint32_t out_share_flags = 0;
 115         uint32_t out_capabilities = 0;
 116         uint32_t out_maximal_access = 0;
 117         uint32_t out_tree_id = 0;
 118         NTSTATUS status;
 119         NTSTATUS error;
 120
 121         status = smbd_smb2_tree_connect_recv(subreq,
 122                                              &out_share_type,
 123                                              &out_share_flags,
 124                                              &out_capabilities,
 125                                              &out_maximal_access,
 126                                              &out_tree_id);
 127         TALLOC_FREE(subreq);
 128         if (!NT_STATUS_IS_OK(status)) {
 129                 error = smbd_smb2_request_error(req, status);
 130                 if (!NT_STATUS_IS_OK(error)) {
 131                         smbd_server_connection_terminate(req->sconn,
 132                                                          nt_errstr(error));
 133                         return;
 134                 }
 135                 return;
 136         }
 137
 138         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 139
 140         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
 141         if (outbody.data == NULL) {
 142                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 143                 if (!NT_STATUS_IS_OK(error)) {
 144                         smbd_server_connection_terminate(req->sconn,
 145                                                          nt_errstr(error));
 146                         return;
 147                 }
 148                 return;
 149         }
 150
 151         SIVAL(outhdr, SMB2_HDR_TID, out_tree_id);
 152
 153         SSVAL(outbody.data, 0x00, 0x10);        /* struct size */
 154         SCVAL(outbody.data, 0x02,
 155               out_share_type);                  /* share type */
 156         SCVAL(outbody.data, 0x03, 0);           /* reserved */
 157         SIVAL(outbody.data, 0x04,
 158               out_share_flags);                 /* share flags */
 159         SIVAL(outbody.data, 0x08,
 160               out_capabilities);                /* capabilities */
 161         SIVAL(outbody.data, 0x0C,
 162               out_maximal_access);              /* maximal access */
 163
 164         error = smbd_smb2_request_done(req, outbody, NULL);
 165         if (!NT_STATUS_IS_OK(error)) {
 166                 smbd_server_connection_terminate(req->sconn,
 167                                                  nt_errstr(error));
 168                 return;
 169         }
 170 }
 171
 172 static NTSTATUS smbd_smb2_tree_connect(struct smbd_smb2_request *req,
 173                                        const char *in_path,
 174                                        uint8_t *out_share_type,
 175                                        uint32_t *out_share_flags,
 176                                        uint32_t *out_capabilities,
 177                                        uint32_t *out_maximal_access,
 178                                        uint32_t *out_tree_id)
 179 {
 180         const char *share = in_path;
 181         char *service = NULL;
 182         int snum = -1;
 183         struct smbXsrv_tcon *tcon;
 184         NTTIME now = timeval_to_nttime(&req->request_time);
 185         connection_struct *compat_conn = NULL;
 186         struct user_struct *compat_vuser = req->session->compat;
 187         NTSTATUS status;
 188
 189         if (strncmp(share, "\\\\", 2) == 0) {
 190                 const char *p = strchr(share+2, '\\');
 191                 if (p) {
 192                         share = p + 1;
 193                 }
 194         }
 195
 196         DEBUG(10,("smbd_smb2_tree_connect: path[%s] share[%s]\n",
 197                   in_path, share));
 198
 199         service = talloc_strdup(talloc_tos(), share);
 200         if(!service) {
 201                 return NT_STATUS_NO_MEMORY;
 202         }
 203
 204         strlower_m(service);
 205
 206         /* TODO: do more things... */
 207         if (strequal(service,HOMES_NAME)) {
 208                 if (compat_vuser->homes_snum == -1) {
 209                         DEBUG(2, ("[homes] share not available for "
 210                                 "user %s because it was not found "
 211                                 "or created at session setup "
 212                                 "time\n",
 213                                 compat_vuser->session_info->unix_info->unix_name));
 214                         return NT_STATUS_BAD_NETWORK_NAME;
 215                 }
 216                 snum = compat_vuser->homes_snum;
 217         } else if ((compat_vuser->homes_snum != -1)
 218                    && strequal(service,
 219                         lp_servicename(talloc_tos(), compat_vuser->homes_snum))) {
 220                 snum = compat_vuser->homes_snum;
 221         } else {
 222                 snum = find_service(talloc_tos(), service, &service);
 223                 if (!service) {
 224                         return NT_STATUS_NO_MEMORY;
 225                 }
 226         }
 227
 228         if (snum < 0) {
 229                 DEBUG(3,("smbd_smb2_tree_connect: couldn't find service %s\n",
 230                          service));
 231                 return NT_STATUS_BAD_NETWORK_NAME;
 232         }
 233
 234         if (lp_smb_encrypt(snum) == SMB_SIGNING_REQUIRED) {
 235                 status = NT_STATUS_ACCESS_DENIED;
 236                 DEBUG(3,("smbd_smb2_tree_connect: "
 237                          "service %s needs encryption - %s\n",
 238                          service, nt_errstr(status)));
 239                 return status;
 240         }
 241
 242         /* create a new tcon as child of the session */
 243         status = smb2srv_tcon_create(req->session, now, &tcon);
 244         if (!NT_STATUS_IS_OK(status)) {
 245                 return status;
 246         }
 247
 248         compat_conn = make_connection_smb2(req->sconn,
 249                                         tcon, snum,
 250                                         req->session->compat,
 251                                         "???",
 252                                         &status);
 253         if (compat_conn == NULL) {
 254                 TALLOC_FREE(tcon);
 255                 return status;
 256         }
 257
 258         tcon->global->share_name = lp_servicename(tcon->global,
 259                                                   SNUM(compat_conn));
 260         if (tcon->global->share_name == NULL) {
 261                 conn_free(compat_conn);
 262                 TALLOC_FREE(tcon);
 263                 return NT_STATUS_NO_MEMORY;
 264         }
 265
 266         tcon->compat = talloc_move(tcon, &compat_conn);
 267
 268         tcon->status = NT_STATUS_OK;
 269
 270         status = smbXsrv_tcon_update(tcon);
 271         if (!NT_STATUS_IS_OK(status)) {
 272                 TALLOC_FREE(tcon);
 273                 return status;
 274         }
 275
 276         if (IS_PRINT(tcon->compat)) {
 277                 *out_share_type = SMB2_SHARE_TYPE_PRINT;
 278         } else if (IS_IPC(tcon->compat)) {
 279                 *out_share_type = SMB2_SHARE_TYPE_PIPE;
 280         } else {
 281                 *out_share_type = SMB2_SHARE_TYPE_DISK;
 282         }
 283
 284         *out_share_flags = 0;
 285
 286         if (lp_msdfs_root(SNUM(tcon->compat)) && lp_host_msdfs()) {
 287                 *out_share_flags |= (SMB2_SHAREFLAG_DFS|SMB2_SHAREFLAG_DFS_ROOT);
 288                 *out_capabilities = SMB2_SHARE_CAP_DFS;
 289         } else {
 290                 *out_capabilities = 0;
 291         }
 292
 293         switch(lp_csc_policy(SNUM(tcon->compat))) {
 294         case CSC_POLICY_MANUAL:
 295                 break;
 296         case CSC_POLICY_DOCUMENTS:
 297                 *out_share_flags |= SMB2_SHAREFLAG_AUTO_CACHING;
 298                 break;
 299         case CSC_POLICY_PROGRAMS:
 300                 *out_share_flags |= SMB2_SHAREFLAG_VDO_CACHING;
 301                 break;
 302         case CSC_POLICY_DISABLE:
 303                 *out_share_flags |= SMB2_SHAREFLAG_NO_CACHING;
 304                 break;
 305         default:
 306                 break;
 307         }
 308
 309         if (lp_hideunreadable(SNUM(tcon->compat)) ||
 310             lp_hideunwriteable_files(SNUM(tcon->compat))) {
 311                 *out_share_flags |= SMB2_SHAREFLAG_ACCESS_BASED_DIRECTORY_ENUM;
 312         }
 313
 314         *out_maximal_access = tcon->compat->share_access;
 315
 316         *out_tree_id = tcon->global->tcon_wire_id;
 317         return NT_STATUS_OK;
 318 }
 319
 320 struct smbd_smb2_tree_connect_state {
 321         const char *in_path;
 322         uint8_t out_share_type;
 323         uint32_t out_share_flags;
 324         uint32_t out_capabilities;
 325         uint32_t out_maximal_access;
 326         uint32_t out_tree_id;
 327 };
 328
 329 static struct tevent_req *smbd_smb2_tree_connect_send(TALLOC_CTX *mem_ctx,
 330                                         struct tevent_context *ev,
 331                                         struct smbd_smb2_request *smb2req,
 332                                         const char *in_path)
 333 {
 334         struct tevent_req *req;
 335         struct smbd_smb2_tree_connect_state *state;
 336         NTSTATUS status;
 337
 338         req = tevent_req_create(mem_ctx, &state,
 339                                 struct smbd_smb2_tree_connect_state);
 340         if (req == NULL) {
 341                 return NULL;
 342         }
 343         state->in_path = in_path;
 344
 345         status = smbd_smb2_tree_connect(smb2req,
 346                                         state->in_path,
 347                                         &state->out_share_type,
 348                                         &state->out_share_flags,
 349                                         &state->out_capabilities,
 350                                         &state->out_maximal_access,
 351                                         &state->out_tree_id);
 352         if (tevent_req_nterror(req, status)) {
 353                 return tevent_req_post(req, ev);
 354         }
 355
 356         tevent_req_done(req);
 357         return tevent_req_post(req, ev);
 358 }
 359
 360 static NTSTATUS smbd_smb2_tree_connect_recv(struct tevent_req *req,
 361                                             uint8_t *out_share_type,
 362                                             uint32_t *out_share_flags,
 363                                             uint32_t *out_capabilities,
 364                                             uint32_t *out_maximal_access,
 365                                             uint32_t *out_tree_id)
 366 {
 367         struct smbd_smb2_tree_connect_state *state =
 368                 tevent_req_data(req,
 369                 struct smbd_smb2_tree_connect_state);
 370         NTSTATUS status;
 371
 372         if (tevent_req_is_nterror(req, &status)) {
 373                 tevent_req_received(req);
 374                 return status;
 375         }
 376
 377         *out_share_type = state->out_share_type;
 378         *out_share_flags = state->out_share_flags;
 379         *out_capabilities = state->out_capabilities;
 380         *out_maximal_access = state->out_maximal_access;
 381         *out_tree_id = state->out_tree_id;
 382
 383         tevent_req_received(req);
 384         return NT_STATUS_OK;
 385 }
 386
 387 NTSTATUS smbd_smb2_request_process_tdis(struct smbd_smb2_request *req)
 388 {
 389         NTSTATUS status;
 390         DATA_BLOB outbody;
 391
 392         status = smbd_smb2_request_verify_sizes(req, 0x04);
 393         if (!NT_STATUS_IS_OK(status)) {
 394                 return smbd_smb2_request_error(req, status);
 395         }
 396
 397         /*
 398          * TODO: cancel all outstanding requests on the tcon
 399          */
 400         status = smbXsrv_tcon_disconnect(req->tcon, req->tcon->compat->vuid);
 401         if (!NT_STATUS_IS_OK(status)) {
 402                 DEBUG(0, ("smbd_smb2_request_process_tdis: "
 403                           "smbXsrv_tcon_disconnect() failed: %s\n",
 404                           nt_errstr(status)));
 405                 /*
 406                  * If we hit this case, there is something completely
 407                  * wrong, so we better disconnect the transport connection.
 408                  */
 409                 return status;
 410         }
 411
 412         TALLOC_FREE(req->tcon);
 413
 414         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 415         if (outbody.data == NULL) {
 416                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 417         }
 418
 419         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 420         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 421
 422         return smbd_smb2_request_done(req, outbody, NULL);
 423 }