source3/rpc_client/cli_pipe_schannel.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  RPC Pipe client / server routines
   4  *  Largely rewritten by Jeremy Allison             2005.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "includes.h"
  21 #include "../librpc/gen_ndr/ndr_schannel.h"
  22 #include "../librpc/gen_ndr/ndr_netlogon.h"
  23 #include "../libcli/auth/schannel.h"
  24 #include "rpc_client/cli_netlogon.h"
  25 #include "rpc_client/cli_pipe.h"
  26 #include "librpc/gen_ndr/ndr_dcerpc.h"
  27 #include "librpc/rpc/dcerpc.h"
  28 #include "passdb.h"
  29 #include "libsmb/libsmb.h"
  30 #include "auth/gensec/gensec.h"
  31
  32 #undef DBGC_CLASS
  33 #define DBGC_CLASS DBGC_RPC_CLI
  34
  35
  36 /****************************************************************************
  37   Get a the schannel session key out of an already opened netlogon pipe.
  38  ****************************************************************************/
  39 static NTSTATUS get_schannel_session_key_common(struct rpc_pipe_client *netlogon_pipe,
  40                                                 struct cli_state *cli,
  41                                                 const char *domain,
  42                                                 uint32 *pneg_flags)
  43 {
  44         enum netr_SchannelType sec_chan_type = 0;
  45         unsigned char machine_pwd[16];
  46         const char *machine_account;
  47         NTSTATUS status;
  48
  49         /* Get the machine account credentials from secrets.tdb. */
  50         if (!get_trust_pw_hash(domain, machine_pwd, &machine_account,
  51                                &sec_chan_type))
  52         {
  53                 DEBUG(0, ("get_schannel_session_key: could not fetch "
  54                         "trust account password for domain '%s'\n",
  55                         domain));
  56                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
  57         }
  58
  59         status = rpccli_netlogon_setup_creds(netlogon_pipe,
  60                                         cli_state_remote_name(cli), /* server name */
  61                                         domain,        /* domain */
  62                                         lp_netbios_name(), /* client name */
  63                                         machine_account, /* machine account name */
  64                                         machine_pwd,
  65                                         sec_chan_type,
  66                                         pneg_flags);
  67
  68         if (!NT_STATUS_IS_OK(status)) {
  69                 DEBUG(3, ("get_schannel_session_key_common: "
  70                           "rpccli_netlogon_setup_creds failed with result %s "
  71                           "to server %s, domain %s, machine account %s.\n",
  72                           nt_errstr(status), cli_state_remote_name(cli), domain,
  73                           machine_account ));
  74                 return status;
  75         }
  76
  77         if (((*pneg_flags) & NETLOGON_NEG_SCHANNEL) == 0) {
  78                 DEBUG(3, ("get_schannel_session_key: Server %s did not offer schannel\n",
  79                         cli_state_remote_name(cli)));
  80                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
  81         }
  82
  83         return NT_STATUS_OK;
  84 }
  85
  86 /****************************************************************************
  87  Open a named pipe to an SMB server and bind using schannel (bind type 68).
  88  Fetch the session key ourselves using a temporary netlogon pipe. This
  89  version uses an ntlmssp auth bound netlogon pipe to get the key.
  90  ****************************************************************************/
  91
  92 static NTSTATUS get_schannel_session_key_auth_ntlmssp(struct cli_state *cli,
  93                                                       const char *domain,
  94                                                       const char *username,
  95                                                       const char *password,
  96                                                       uint32 *pneg_flags,
  97                                                       struct rpc_pipe_client **presult)
  98 {
  99         struct rpc_pipe_client *netlogon_pipe = NULL;
 100         NTSTATUS status;
 101
 102         status = cli_rpc_pipe_open_spnego(
 103                 cli, &ndr_table_netlogon, NCACN_NP,
 104                 GENSEC_OID_NTLMSSP,
 105                 DCERPC_AUTH_LEVEL_PRIVACY,
 106                 cli_state_remote_name(cli),
 107                 domain, username, password, &netlogon_pipe);
 108         if (!NT_STATUS_IS_OK(status)) {
 109                 return status;
 110         }
 111
 112         status = get_schannel_session_key_common(netlogon_pipe, cli, domain,
 113                                                  pneg_flags);
 114         if (!NT_STATUS_IS_OK(status)) {
 115                 TALLOC_FREE(netlogon_pipe);
 116                 return status;
 117         }
 118
 119         *presult = netlogon_pipe;
 120         return NT_STATUS_OK;
 121 }
 122
 123 /****************************************************************************
 124  Open a named pipe to an SMB server and bind using schannel (bind type 68).
 125  Fetch the session key ourselves using a temporary netlogon pipe. This version
 126  uses an ntlmssp bind to get the session key.
 127  ****************************************************************************/
 128
 129 NTSTATUS cli_rpc_pipe_open_ntlmssp_auth_schannel(struct cli_state *cli,
 130                                                  const struct ndr_syntax_id *interface,
 131                                                  enum dcerpc_transport_t transport,
 132                                                  enum dcerpc_AuthLevel auth_level,
 133                                                  const char *domain,
 134                                                  const char *username,
 135                                                  const char *password,
 136                                                  struct rpc_pipe_client **presult)
 137 {
 138         uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
 139         struct rpc_pipe_client *netlogon_pipe = NULL;
 140         struct rpc_pipe_client *result = NULL;
 141         NTSTATUS status;
 142
 143         status = get_schannel_session_key_auth_ntlmssp(
 144                 cli, domain, username, password, &neg_flags, &netlogon_pipe);
 145         if (!NT_STATUS_IS_OK(status)) {
 146                 DEBUG(0,("cli_rpc_pipe_open_ntlmssp_auth_schannel: failed to get schannel session "
 147                         "key from server %s for domain %s.\n",
 148                         cli_state_remote_name(cli), domain ));
 149                 return status;
 150         }
 151
 152         status = cli_rpc_pipe_open_schannel_with_key(
 153                 cli, interface, transport, auth_level, domain, &netlogon_pipe->dc,
 154                 &result);
 155
 156         /* Now we've bound using the session key we can close the netlog pipe. */
 157         TALLOC_FREE(netlogon_pipe);
 158
 159         if (NT_STATUS_IS_OK(status)) {
 160                 *presult = result;
 161         }
 162         return status;
 163 }
 164
 165 /****************************************************************************
 166  Open a named pipe to an SMB server and bind using schannel (bind type 68).
 167  Fetch the session key ourselves using a temporary netlogon pipe.
 168  ****************************************************************************/
 169
 170 NTSTATUS cli_rpc_pipe_open_schannel(struct cli_state *cli,
 171                                     const struct ndr_syntax_id *interface,
 172                                     enum dcerpc_transport_t transport,
 173                                     enum dcerpc_AuthLevel auth_level,
 174                                     const char *domain,
 175                                     struct rpc_pipe_client **presult)
 176 {
 177         uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
 178         struct rpc_pipe_client *netlogon_pipe = NULL;
 179         struct rpc_pipe_client *result = NULL;
 180         NTSTATUS status;
 181
 182         status = get_schannel_session_key(cli, domain, &neg_flags,
 183                                           &netlogon_pipe);
 184         if (!NT_STATUS_IS_OK(status)) {
 185                 DEBUG(0,("cli_rpc_pipe_open_schannel: failed to get schannel session "
 186                         "key from server %s for domain %s.\n",
 187                         cli_state_remote_name(cli), domain ));
 188                 return status;
 189         }
 190
 191         status = cli_rpc_pipe_open_schannel_with_key(
 192                 cli, interface, transport, auth_level, domain, &netlogon_pipe->dc,
 193                 &result);
 194
 195         /* Now we've bound using the session key we can close the netlog pipe. */
 196         TALLOC_FREE(netlogon_pipe);
 197
 198         if (NT_STATUS_IS_OK(status)) {
 199                 *presult = result;
 200         }
 201
 202         return status;
 203 }
 204
 205 /****************************************************************************
 206  Open a netlogon pipe and get the schannel session key.
 207  Now exposed to external callers.
 208  ****************************************************************************/
 209
 210
 211 NTSTATUS get_schannel_session_key(struct cli_state *cli,
 212                                   const char *domain,
 213                                   uint32 *pneg_flags,
 214                                   struct rpc_pipe_client **presult)
 215 {
 216         struct rpc_pipe_client *netlogon_pipe = NULL;
 217         NTSTATUS status;
 218
 219         status = cli_rpc_pipe_open_noauth(cli, &ndr_table_netlogon.syntax_id,
 220                                           &netlogon_pipe);
 221         if (!NT_STATUS_IS_OK(status)) {
 222                 return status;
 223         }
 224
 225         status = get_schannel_session_key_common(netlogon_pipe, cli, domain,
 226                                                  pneg_flags);
 227         if (!NT_STATUS_IS_OK(status)) {
 228                 TALLOC_FREE(netlogon_pipe);
 229                 return status;
 230         }
 231
 232         *presult = netlogon_pipe;
 233         return NT_STATUS_OK;
 234 }