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         /* create a new tcon as child of the session */
 235         status = smb2srv_tcon_create(req->session, now, &tcon);
 236         if (!NT_STATUS_IS_OK(status)) {
 237                 return status;
 238         }
 239
 240         compat_conn = make_connection_smb2(req->sconn,
 241                                         tcon, snum,
 242                                         req->session->compat,
 243                                         "???",
 244                                         &status);
 245         if (compat_conn == NULL) {
 246                 TALLOC_FREE(tcon);
 247                 return status;
 248         }
 249
 250         tcon->global->share_name = lp_servicename(tcon->global,
 251                                                   SNUM(compat_conn));
 252         if (tcon->global->share_name == NULL) {
 253                 conn_free(compat_conn);
 254                 TALLOC_FREE(tcon);
 255                 return NT_STATUS_NO_MEMORY;
 256         }
 257
 258         tcon->compat = talloc_move(tcon, &compat_conn);
 259
 260         tcon->status = NT_STATUS_OK;
 261
 262         status = smbXsrv_tcon_update(tcon);
 263         if (!NT_STATUS_IS_OK(status)) {
 264                 TALLOC_FREE(tcon);
 265                 return status;
 266         }
 267
 268         if (IS_PRINT(tcon->compat)) {
 269                 *out_share_type = SMB2_SHARE_TYPE_PRINT;
 270         } else if (IS_IPC(tcon->compat)) {
 271                 *out_share_type = SMB2_SHARE_TYPE_PIPE;
 272         } else {
 273                 *out_share_type = SMB2_SHARE_TYPE_DISK;
 274         }
 275
 276         *out_share_flags = 0;
 277
 278         if (lp_msdfs_root(SNUM(tcon->compat)) && lp_host_msdfs()) {
 279                 *out_share_flags |= (SMB2_SHAREFLAG_DFS|SMB2_SHAREFLAG_DFS_ROOT);
 280                 *out_capabilities = SMB2_SHARE_CAP_DFS;
 281         } else {
 282                 *out_capabilities = 0;
 283         }
 284
 285         switch(lp_csc_policy(SNUM(tcon->compat))) {
 286         case CSC_POLICY_MANUAL:
 287                 break;
 288         case CSC_POLICY_DOCUMENTS:
 289                 *out_share_flags |= SMB2_SHAREFLAG_AUTO_CACHING;
 290                 break;
 291         case CSC_POLICY_PROGRAMS:
 292                 *out_share_flags |= SMB2_SHAREFLAG_VDO_CACHING;
 293                 break;
 294         case CSC_POLICY_DISABLE:
 295                 *out_share_flags |= SMB2_SHAREFLAG_NO_CACHING;
 296                 break;
 297         default:
 298                 break;
 299         }
 300
 301         if (lp_hideunreadable(SNUM(tcon->compat)) ||
 302             lp_hideunwriteable_files(SNUM(tcon->compat))) {
 303                 *out_share_flags |= SMB2_SHAREFLAG_ACCESS_BASED_DIRECTORY_ENUM;
 304         }
 305
 306         *out_maximal_access = tcon->compat->share_access;
 307
 308         *out_tree_id = tcon->global->tcon_wire_id;
 309         return NT_STATUS_OK;
 310 }
 311
 312 struct smbd_smb2_tree_connect_state {
 313         const char *in_path;
 314         uint8_t out_share_type;
 315         uint32_t out_share_flags;
 316         uint32_t out_capabilities;
 317         uint32_t out_maximal_access;
 318         uint32_t out_tree_id;
 319 };
 320
 321 static struct tevent_req *smbd_smb2_tree_connect_send(TALLOC_CTX *mem_ctx,
 322                                         struct tevent_context *ev,
 323                                         struct smbd_smb2_request *smb2req,
 324                                         const char *in_path)
 325 {
 326         struct tevent_req *req;
 327         struct smbd_smb2_tree_connect_state *state;
 328         NTSTATUS status;
 329
 330         req = tevent_req_create(mem_ctx, &state,
 331                                 struct smbd_smb2_tree_connect_state);
 332         if (req == NULL) {
 333                 return NULL;
 334         }
 335         state->in_path = in_path;
 336
 337         status = smbd_smb2_tree_connect(smb2req,
 338                                         state->in_path,
 339                                         &state->out_share_type,
 340                                         &state->out_share_flags,
 341                                         &state->out_capabilities,
 342                                         &state->out_maximal_access,
 343                                         &state->out_tree_id);
 344         if (tevent_req_nterror(req, status)) {
 345                 return tevent_req_post(req, ev);
 346         }
 347
 348         tevent_req_done(req);
 349         return tevent_req_post(req, ev);
 350 }
 351
 352 static NTSTATUS smbd_smb2_tree_connect_recv(struct tevent_req *req,
 353                                             uint8_t *out_share_type,
 354                                             uint32_t *out_share_flags,
 355                                             uint32_t *out_capabilities,
 356                                             uint32_t *out_maximal_access,
 357                                             uint32_t *out_tree_id)
 358 {
 359         struct smbd_smb2_tree_connect_state *state =
 360                 tevent_req_data(req,
 361                 struct smbd_smb2_tree_connect_state);
 362         NTSTATUS status;
 363
 364         if (tevent_req_is_nterror(req, &status)) {
 365                 tevent_req_received(req);
 366                 return status;
 367         }
 368
 369         *out_share_type = state->out_share_type;
 370         *out_share_flags = state->out_share_flags;
 371         *out_capabilities = state->out_capabilities;
 372         *out_maximal_access = state->out_maximal_access;
 373         *out_tree_id = state->out_tree_id;
 374
 375         tevent_req_received(req);
 376         return NT_STATUS_OK;
 377 }
 378
 379 NTSTATUS smbd_smb2_request_process_tdis(struct smbd_smb2_request *req)
 380 {
 381         NTSTATUS status;
 382         DATA_BLOB outbody;
 383
 384         status = smbd_smb2_request_verify_sizes(req, 0x04);
 385         if (!NT_STATUS_IS_OK(status)) {
 386                 return smbd_smb2_request_error(req, status);
 387         }
 388
 389         /*
 390          * TODO: cancel all outstanding requests on the tcon
 391          */
 392         status = smbXsrv_tcon_disconnect(req->tcon, req->tcon->compat->vuid);
 393         if (!NT_STATUS_IS_OK(status)) {
 394                 DEBUG(0, ("smbd_smb2_request_process_tdis: "
 395                           "smbXsrv_tcon_disconnect() failed: %s\n",
 396                           nt_errstr(status)));
 397                 /*
 398                  * If we hit this case, there is something completely
 399                  * wrong, so we better disconnect the transport connection.
 400                  */
 401                 return status;
 402         }
 403
 404         TALLOC_FREE(req->tcon);
 405
 406         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 407         if (outbody.data == NULL) {
 408                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 409         }
 410
 411         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 412         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 413
 414         return smbd_smb2_request_done(req, outbody, NULL);
 415 }