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##############################################################################
# Copyright (c) 2015 Ericsson AB and others.
# Authors: George Paraskevopoulos (geopar@intracom-telecom.com)
# Jose Lausuch (jose.lausuch@ericsson.com)
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
##############################################################################
import os
import paramiko
from opnfv.utils import opnfv_logger as logger
logger = logger.Logger("SSH utils").getLogger()
SSH_TIMEOUT = 60
''' Monkey Patch paramiko _custom_start_client '''
# We are using paramiko 2.1.1 and in the CI in the SFC
# test we are facing this issue:
# https://github.com/robotframework/SSHLibrary/issues/158
# The fix was merged in paramiko 2.1.3 in this PR:
# https://github.com/robotframework/SSHLibrary/pull/159/files
# Until we upgrade we can use this monkey patch to work
# around the issue
def _custom_start_client(self, *args, **kwargs):
self.banner_timeout = 45
self._orig_start_client(*args, **kwargs)
paramiko.transport.Transport._orig_start_client = \
paramiko.transport.Transport.start_client
paramiko.transport.Transport.start_client = _custom_start_client
''' Monkey Patch paramiko _custom_start_client '''
def get_ssh_client(hostname,
username,
password=None,
proxy=None,
pkey_file=None):
client = None
try:
if proxy is None:
client = paramiko.SSHClient()
else:
client = ProxyHopClient()
proxy_pkey_file = proxy.get('pkey_file', '/root/.ssh/id_rsa')
client.configure_jump_host(proxy['ip'],
proxy['username'],
proxy['password'],
proxy_pkey_file)
if client is None:
raise Exception('Could not connect to client')
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
if pkey_file is not None:
key = paramiko.RSAKey.from_private_key_file(pkey_file)
client.load_system_host_keys()
client.connect(hostname,
username=username,
pkey=key,
timeout=SSH_TIMEOUT)
else:
client.connect(hostname,
username=username,
password=password,
timeout=SSH_TIMEOUT)
return client
except Exception as e:
logger.error(e)
return None
def get_file(ssh_conn, src, dest):
try:
sftp = ssh_conn.open_sftp()
sftp.get(src, dest)
return True
except Exception as e:
logger.error("Error [get_file(ssh_conn, '%s', '%s']: %s" %
(src, dest, e))
return None
def put_file(ssh_conn, src, dest):
try:
sftp = ssh_conn.open_sftp()
sftp.put(src, dest)
return True
except Exception as e:
logger.error("Error [put_file(ssh_conn, '%s', '%s']: %s" %
(src, dest, e))
return None
class ProxyHopClient(paramiko.SSHClient):
'''
Connect to a remote server using a proxy hop
'''
def __init__(self, *args, **kwargs):
self.proxy_ssh = None
self.proxy_transport = None
self.proxy_channel = None
self.proxy_ip = None
self.proxy_ssh_key = None
self.local_ssh_key = os.path.join(os.getcwd(), 'id_rsa')
super(ProxyHopClient, self).__init__(*args, **kwargs)
def configure_jump_host(self, jh_ip, jh_user, jh_pass,
jh_ssh_key='/root/.ssh/id_rsa'):
self.proxy_ip = jh_ip
self.proxy_ssh_key = jh_ssh_key
self.local_ssh_key = os.path.join(os.getcwd(),
jh_ssh_key.split('/')[-1])
self.proxy_ssh = paramiko.SSHClient()
self.proxy_ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
self.proxy_ssh.connect(jh_ip,
username=jh_user,
password=jh_pass,
timeout=SSH_TIMEOUT)
self.proxy_transport = self.proxy_ssh.get_transport()
def connect(self, hostname, port=22, username='root', password=None,
pkey=None, key_filename=None, timeout=None, allow_agent=True,
look_for_keys=True, compress=False, sock=None, gss_auth=False,
gss_kex=False, gss_deleg_creds=True, gss_host=None,
banner_timeout=None):
try:
if self.proxy_ssh is None:
raise Exception('You must configure the jump '
'host before calling connect')
get_file_res = get_file(self.proxy_ssh,
self.proxy_ssh_key,
self.local_ssh_key)
if get_file_res is None:
raise Exception('Could\'t fetch SSH key from jump host')
if self.proxy_ssh_key.split('/')[-1] == 'id_dsa':
proxy_key = (paramiko.DSSKey
.from_private_key_file(self.local_ssh_key))
else:
proxy_key = (paramiko.RSAKey
.from_private_key_file(self.local_ssh_key))
self.proxy_channel = self.proxy_transport.open_channel(
"direct-tcpip",
(hostname, 22),
(self.proxy_ip, 22))
self.set_missing_host_key_policy(paramiko.AutoAddPolicy())
super(ProxyHopClient, self).connect(hostname,
username=username,
pkey=proxy_key,
sock=self.proxy_channel,
timeout=timeout)
os.remove(self.local_ssh_key)
except Exception as e:
logger.error(e)
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