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Adding logic for DCs with RestrictRemoteClients = 2 #2166

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30 changes: 28 additions & 2 deletions impacket/examples/secretsdump.py
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Original file line number Diff line number Diff line change
Expand Up @@ -495,8 +495,34 @@ def connectSamr(self, domain):
self.__domainName = domain

def __connectDrds(self):
stringBinding = epm.hept_map(self.__smbConnection.getRemoteHost(), drsuapi.MSRPC_UUID_DRSUAPI,
protocol='ncacn_ip_tcp')
remote_host = self.__smbConnection.getRemoteHost()
try:
stringBinding = epm.hept_map(remote_host, drsuapi.MSRPC_UUID_DRSUAPI,
protocol='ncacn_ip_tcp')
except DCERPCException as e:
# RestrictRemoteClients = 2 (and similar policies): unauthenticated clients cannot
# talk to the TCP Endpoint Mapper (135). Resolve the DRSUAPI port via authenticated
# SMB to \\pipe\\epmapper, same pattern as examples/mimikatz.py.
if 'rpc_s_access_denied' not in str(e).lower():
raise
LOG.info('Endpoint Mapper (TCP/135) denied anonymous access; using authenticated epmapper pipe')
epm_rpc = transport.DCERPCTransportFactory(r'ncacn_np:445[\pipe\epmapper]')
epm_rpc.set_smb_connection(self.__smbConnection)
if hasattr(epm_rpc, 'set_credentials'):
epm_rpc.set_credentials(*(self.__smbConnection.getCredentials()))
epm_rpc.set_kerberos(self.__doKerberos, self.__kdcHost)
epm_rpc.setRemoteHost(self.__smbConnection.getRemoteHost())
epm_rpc.setRemoteName(self.__smbConnection.getRemoteName())
epm_dce = epm_rpc.get_dce_rpc()
epm_dce.set_auth_level(RPC_C_AUTHN_LEVEL_PKT_PRIVACY)
if self.__doKerberos:
epm_dce.set_auth_type(RPC_C_AUTHN_GSS_NEGOTIATE)
epm_dce.connect()
try:
stringBinding = epm.hept_map(remote_host, drsuapi.MSRPC_UUID_DRSUAPI,
protocol='ncacn_ip_tcp', dce=epm_dce)
finally:
epm_dce.disconnect()
rpc = transport.DCERPCTransportFactory(stringBinding)
rpc.setRemoteHost(self.__smbConnection.getRemoteHost())
rpc.setRemoteName(self.__smbConnection.getRemoteName())
Expand Down