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 int smbd_smb2_tcon_destructor(struct smbd_smb2_tcon *tcon)
 173 {
 174         if (tcon->session == NULL) {
 175                 return 0;
 176         }
 177
 178         idr_remove(tcon->session->tcons.idtree, tcon->tid);
 179         DLIST_REMOVE(tcon->session->tcons.list, tcon);
 180
 181         if (tcon->compat_conn) {
 182                 set_current_service(tcon->compat_conn, 0, true);
 183                 close_cnum(tcon->compat_conn, tcon->session->vuid);
 184         }
 185
 186         tcon->compat_conn = NULL;
 187         tcon->tid = 0;
 188         tcon->session = NULL;
 189
 190         return 0;
 191 }
 192
 193 static NTSTATUS smbd_smb2_tree_connect(struct smbd_smb2_request *req,
 194                                        const char *in_path,
 195                                        uint8_t *out_share_type,
 196                                        uint32_t *out_share_flags,
 197                                        uint32_t *out_capabilities,
 198                                        uint32_t *out_maximal_access,
 199                                        uint32_t *out_tree_id)
 200 {
 201         const char *share = in_path;
 202         char *service = NULL;
 203         int snum = -1;
 204         struct smbd_smb2_tcon *tcon;
 205         connection_struct *compat_conn = NULL;
 206         struct user_struct *compat_vuser = req->session->compat_vuser;
 207         int id;
 208         NTSTATUS status;
 209
 210         if (strncmp(share, "\\\\", 2) == 0) {
 211                 const char *p = strchr(share+2, '\\');
 212                 if (p) {
 213                         share = p + 1;
 214                 }
 215         }
 216
 217         DEBUG(10,("smbd_smb2_tree_connect: path[%s] share[%s]\n",
 218                   in_path, share));
 219
 220         service = talloc_strdup(talloc_tos(), share);
 221         if(!service) {
 222                 return NT_STATUS_NO_MEMORY;
 223         }
 224
 225         strlower_m(service);
 226
 227         /* TODO: do more things... */
 228         if (strequal(service,HOMES_NAME)) {
 229                 if (compat_vuser->homes_snum == -1) {
 230                         DEBUG(2, ("[homes] share not available for "
 231                                 "user %s because it was not found "
 232                                 "or created at session setup "
 233                                 "time\n",
 234                                 compat_vuser->session_info->unix_info->unix_name));
 235                         return NT_STATUS_BAD_NETWORK_NAME;
 236                 }
 237                 snum = compat_vuser->homes_snum;
 238         } else if ((compat_vuser->homes_snum != -1)
 239                    && strequal(service,
 240                         lp_servicename(compat_vuser->homes_snum))) {
 241                 snum = compat_vuser->homes_snum;
 242         } else {
 243                 snum = find_service(talloc_tos(), service, &service);
 244                 if (!service) {
 245                         return NT_STATUS_NO_MEMORY;
 246                 }
 247         }
 248
 249         if (snum < 0) {
 250                 DEBUG(3,("smbd_smb2_tree_connect: couldn't find service %s\n",
 251                          service));
 252                 return NT_STATUS_BAD_NETWORK_NAME;
 253         }
 254
 255         /* create a new tcon as child of the session */
 256         tcon = talloc_zero(req->session, struct smbd_smb2_tcon);
 257         if (tcon == NULL) {
 258                 return NT_STATUS_NO_MEMORY;
 259         }
 260         id = idr_get_new_random(req->session->tcons.idtree,
 261                                 tcon,
 262                                 req->session->tcons.limit);
 263         if (id == -1) {
 264                 TALLOC_FREE(tcon);
 265                 return NT_STATUS_INSUFFICIENT_RESOURCES;
 266         }
 267         tcon->tid = id;
 268         tcon->snum = snum;
 269
 270         DLIST_ADD_END(req->session->tcons.list, tcon,
 271                       struct smbd_smb2_tcon *);
 272         tcon->session = req->session;
 273         talloc_set_destructor(tcon, smbd_smb2_tcon_destructor);
 274
 275         compat_conn = make_connection_smb2(req->sconn,
 276                                         tcon,
 277                                         req->session->compat_vuser,
 278                                         "???",
 279                                         &status);
 280         if (compat_conn == NULL) {
 281                 TALLOC_FREE(tcon);
 282                 return status;
 283         }
 284         tcon->compat_conn = talloc_move(tcon, &compat_conn);
 285
 286         if (IS_PRINT(tcon->compat_conn)) {
 287                 *out_share_type = SMB2_SHARE_TYPE_PRINT;
 288         } else if (IS_IPC(tcon->compat_conn)) {
 289                 *out_share_type = SMB2_SHARE_TYPE_PIPE;
 290         } else {
 291                 *out_share_type = SMB2_SHARE_TYPE_DISK;
 292         }
 293
 294         *out_share_flags = 0;
 295
 296         if (lp_msdfs_root(SNUM(tcon->compat_conn)) && lp_host_msdfs()) {
 297                 *out_share_flags |= (SMB2_SHAREFLAG_DFS|SMB2_SHAREFLAG_DFS_ROOT);
 298                 *out_capabilities = SMB2_SHARE_CAP_DFS;
 299         } else {
 300                 *out_capabilities = 0;
 301         }
 302
 303         switch(lp_csc_policy(SNUM(tcon->compat_conn))) {
 304         case CSC_POLICY_MANUAL:
 305                 break;
 306         case CSC_POLICY_DOCUMENTS:
 307                 *out_share_flags |= SMB2_SHAREFLAG_AUTO_CACHING;
 308                 break;
 309         case CSC_POLICY_PROGRAMS:
 310                 *out_share_flags |= SMB2_SHAREFLAG_VDO_CACHING;
 311                 break;
 312         case CSC_POLICY_DISABLE:
 313                 *out_share_flags |= SMB2_SHAREFLAG_NO_CACHING;
 314                 break;
 315         default:
 316                 break;
 317         }
 318
 319         if (lp_hideunreadable(SNUM(tcon->compat_conn)) ||
 320             lp_hideunwriteable_files(SNUM(tcon->compat_conn))) {
 321                 *out_share_flags |= SMB2_SHAREFLAG_ACCESS_BASED_DIRECTORY_ENUM;
 322         }
 323
 324         *out_maximal_access = tcon->compat_conn->share_access;
 325
 326         *out_tree_id = tcon->tid;
 327         return NT_STATUS_OK;
 328 }
 329
 330 struct smbd_smb2_tree_connect_state {
 331         const char *in_path;
 332         uint8_t out_share_type;
 333         uint32_t out_share_flags;
 334         uint32_t out_capabilities;
 335         uint32_t out_maximal_access;
 336         uint32_t out_tree_id;
 337 };
 338
 339 static struct tevent_req *smbd_smb2_tree_connect_send(TALLOC_CTX *mem_ctx,
 340                                         struct tevent_context *ev,
 341                                         struct smbd_smb2_request *smb2req,
 342                                         const char *in_path)
 343 {
 344         struct tevent_req *req;
 345         struct smbd_smb2_tree_connect_state *state;
 346         NTSTATUS status;
 347
 348         req = tevent_req_create(mem_ctx, &state,
 349                                 struct smbd_smb2_tree_connect_state);
 350         if (req == NULL) {
 351                 return NULL;
 352         }
 353         state->in_path = in_path;
 354
 355         status = smbd_smb2_tree_connect(smb2req,
 356                                         state->in_path,
 357                                         &state->out_share_type,
 358                                         &state->out_share_flags,
 359                                         &state->out_capabilities,
 360                                         &state->out_maximal_access,
 361                                         &state->out_tree_id);
 362         if (tevent_req_nterror(req, status)) {
 363                 return tevent_req_post(req, ev);
 364         }
 365
 366         tevent_req_done(req);
 367         return tevent_req_post(req, ev);
 368 }
 369
 370 static NTSTATUS smbd_smb2_tree_connect_recv(struct tevent_req *req,
 371                                             uint8_t *out_share_type,
 372                                             uint32_t *out_share_flags,
 373                                             uint32_t *out_capabilities,
 374                                             uint32_t *out_maximal_access,
 375                                             uint32_t *out_tree_id)
 376 {
 377         struct smbd_smb2_tree_connect_state *state =
 378                 tevent_req_data(req,
 379                 struct smbd_smb2_tree_connect_state);
 380         NTSTATUS status;
 381
 382         if (tevent_req_is_nterror(req, &status)) {
 383                 tevent_req_received(req);
 384                 return status;
 385         }
 386
 387         *out_share_type = state->out_share_type;
 388         *out_share_flags = state->out_share_flags;
 389         *out_capabilities = state->out_capabilities;
 390         *out_maximal_access = state->out_maximal_access;
 391         *out_tree_id = state->out_tree_id;
 392
 393         tevent_req_received(req);
 394         return NT_STATUS_OK;
 395 }
 396
 397 NTSTATUS smbd_smb2_request_process_tdis(struct smbd_smb2_request *req)
 398 {
 399         NTSTATUS status;
 400         DATA_BLOB outbody;
 401
 402         status = smbd_smb2_request_verify_sizes(req, 0x04);
 403         if (!NT_STATUS_IS_OK(status)) {
 404                 return smbd_smb2_request_error(req, status);
 405         }
 406
 407         /*
 408          * TODO: cancel all outstanding requests on the tcon
 409          *       and delete all file handles.
 410          */
 411         TALLOC_FREE(req->tcon);
 412
 413         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 414         if (outbody.data == NULL) {
 415                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 416         }
 417
 418         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 419         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 420
 421         return smbd_smb2_request_done(req, outbody, NULL);
 422 }