Line data    Source code

       1             : /*
       2             :    Unix SMB/CIFS implementation.
       3             :    Pipe SMB reply routines
       4             :    Copyright (C) Andrew Tridgell 1992-1998
       5             :    Copyright (C) Luke Kenneth Casson Leighton 1996-1998
       6             :    Copyright (C) Paul Ashton  1997-1998.
       7             :    Copyright (C) Jeremy Allison 2005.
       8             : 
       9             :    This program is free software; you can redistribute it and/or modify
      10             :    it under the terms of the GNU General Public License as published by
      11             :    the Free Software Foundation; either version 3 of the License, or
      12             :    (at your option) any later version.
      13             : 
      14             :    This program is distributed in the hope that it will be useful,
      15             :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      16             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      17             :    GNU General Public License for more details.
      18             : 
      19             :    You should have received a copy of the GNU General Public License
      20             :    along with this program.  If not, see <http://www.gnu.org/licenses/>.
      21             : */
      22             : /*
      23             :    This file handles reply_ calls on named pipes that the server
      24             :    makes to handle specific protocols
      25             : */
      26             : 
      27             : 
      28             : #include "includes.h"
      29             : #include "smbd/smbd.h"
      30             : #include "smbd/globals.h"
      31             : #include "libcli/security/security.h"
      32             : #include "rpc_server/srv_pipe_hnd.h"
      33             : #include "auth/auth_util.h"
      34             : #include "librpc/rpc/dcerpc_helper.h"
      35             : 
      36       20464 : NTSTATUS open_np_file(struct smb_request *smb_req, const char *name,
      37             :                       struct files_struct **pfsp)
      38             : {
      39       20464 :         struct smbXsrv_connection *xconn = smb_req->xconn;
      40       20464 :         struct connection_struct *conn = smb_req->conn;
      41         620 :         struct files_struct *fsp;
      42       20464 :         struct smb_filename *smb_fname = NULL;
      43       20464 :         struct auth_session_info *session_info = conn->session_info;
      44         620 :         NTSTATUS status;
      45             : 
      46       20464 :         status = file_new(smb_req, conn, &fsp);
      47       20464 :         if (!NT_STATUS_IS_OK(status)) {
      48           0 :                 DEBUG(0, ("file_new failed: %s\n", nt_errstr(status)));
      49           0 :                 return status;
      50             :         }
      51             : 
      52       20464 :         fsp->conn = conn;
      53       20464 :         fsp_set_fd(fsp, -1);
      54       20464 :         fsp->vuid = smb_req->vuid;
      55       20464 :         fsp->fsp_flags.can_lock = false;
      56       20464 :         fsp->access_mask = FILE_READ_DATA | FILE_WRITE_DATA;
      57             : 
      58       20464 :         smb_fname = synthetic_smb_fname(talloc_tos(),
      59             :                                         name,
      60             :                                         NULL,
      61             :                                         NULL,
      62             :                                         0,
      63             :                                         0);
      64       20464 :         if (smb_fname == NULL) {
      65           0 :                 file_free(smb_req, fsp);
      66           0 :                 return NT_STATUS_NO_MEMORY;
      67             :         }
      68       20464 :         status = fsp_set_smb_fname(fsp, smb_fname);
      69       20464 :         TALLOC_FREE(smb_fname);
      70       20464 :         if (!NT_STATUS_IS_OK(status)) {
      71           0 :                 file_free(smb_req, fsp);
      72           0 :                 return status;
      73             :         }
      74             : 
      75       20464 :         if (smb_req->smb2req != NULL && smb_req->smb2req->was_encrypted) {
      76           5 :                 struct security_token *security_token = NULL;
      77           5 :                 uint16_t dialect = xconn->smb2.server.dialect;
      78           5 :                 uint16_t srv_smb_encrypt = DCERPC_SMB_ENCRYPTION_REQUIRED;
      79           5 :                 uint16_t cipher = xconn->smb2.server.cipher;
      80           5 :                 struct dom_sid smb3_sid = global_sid_Samba_SMB3;
      81           0 :                 size_t num_smb3_sids;
      82           0 :                 bool ok;
      83             : 
      84           5 :                 session_info = copy_session_info(fsp, conn->session_info);
      85           5 :                 if (session_info == NULL) {
      86           0 :                         DBG_ERR("Failed to copy session info\n");
      87           0 :                         file_free(smb_req, fsp);
      88           0 :                         return NT_STATUS_NO_MEMORY;
      89             :                 }
      90           5 :                 security_token = session_info->security_token;
      91             : 
      92             :                 /*
      93             :                  * Security check:
      94             :                  *
      95             :                  * Make sure we don't have a SMB3 SID in the security token!
      96             :                  */
      97           5 :                 num_smb3_sids = security_token_count_flag_sids(security_token,
      98             :                                                                &smb3_sid,
      99             :                                                                3,
     100             :                                                                NULL);
     101           5 :                 if (num_smb3_sids != 0) {
     102           0 :                         DBG_ERR("ERROR: %zu SMB3 SIDs have already been "
     103             :                                 "detected in the security token!\n",
     104             :                                 num_smb3_sids);
     105           0 :                         file_free(smb_req, fsp);
     106           0 :                         return NT_STATUS_ACCESS_DENIED;
     107             :                 }
     108             : 
     109           5 :                 ok = sid_append_rid(&smb3_sid, dialect);
     110           5 :                 ok &= sid_append_rid(&smb3_sid, srv_smb_encrypt);
     111           5 :                 ok &= sid_append_rid(&smb3_sid, cipher);
     112             : 
     113           5 :                 if (!ok) {
     114           0 :                         DBG_ERR("sid too small\n");
     115           0 :                         file_free(smb_req, fsp);
     116           0 :                         return NT_STATUS_BUFFER_TOO_SMALL;
     117             :                 }
     118             : 
     119           5 :                 status = add_sid_to_array_unique(security_token,
     120             :                                                  &smb3_sid,
     121             :                                                  &security_token->sids,
     122             :                                                  &security_token->num_sids);
     123           5 :                 if (!NT_STATUS_IS_OK(status)) {
     124           0 :                         DBG_ERR("Failed to add SMB3 SID to security token\n");
     125           0 :                         file_free(smb_req, fsp);
     126           0 :                         return status;
     127             :                 }
     128             : 
     129           5 :                 fsp->fsp_flags.encryption_required = true;
     130             :         }
     131             : 
     132       21084 :         status = np_open(fsp, name,
     133       19844 :                          conn->sconn->remote_address,
     134       19844 :                          conn->sconn->local_address,
     135             :                          session_info,
     136       19844 :                          conn->sconn->ev_ctx,
     137       19844 :                          conn->sconn->msg_ctx,
     138       20464 :                          conn->sconn->dce_ctx,
     139       20464 :                          &fsp->fake_file_handle);
     140       20464 :         if (!NT_STATUS_IS_OK(status)) {
     141         158 :                 DEBUG(10, ("np_open(%s) returned %s\n", name,
     142             :                            nt_errstr(status)));
     143         158 :                 file_free(smb_req, fsp);
     144         158 :                 return status;
     145             :         }
     146             : 
     147       20306 :         *pfsp = fsp;
     148             : 
     149       20306 :         return NT_STATUS_OK;
     150             : }