mirror of
https://github.com/thegeeklab/ansible-later.git
synced 2024-06-29 13:40:59 +02:00
420 lines
12 KiB
Python
420 lines
12 KiB
Python
# Copyright (C) 2003-2007 John Rochester <john@jrochester.org>
|
|
#
|
|
# This file is part of paramiko.
|
|
#
|
|
# Paramiko is free software; you can redistribute it and/or modify it under the
|
|
# terms of the GNU Lesser General Public License as published by the Free
|
|
# Software Foundation; either version 2.1 of the License, or (at your option)
|
|
# any later version.
|
|
#
|
|
# Paramiko is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
|
|
# A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
|
|
# details.
|
|
#
|
|
# You should have received a copy of the GNU Lesser General Public License
|
|
# along with Paramiko; if not, write to the Free Software Foundation, Inc.,
|
|
# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
|
|
|
|
"""
|
|
SSH Agent interface
|
|
"""
|
|
|
|
import os
|
|
import socket
|
|
import struct
|
|
import sys
|
|
import threading
|
|
import time
|
|
import tempfile
|
|
import stat
|
|
from select import select
|
|
from paramiko.common import asbytes, io_sleep
|
|
from paramiko.py3compat import byte_chr
|
|
|
|
from paramiko.ssh_exception import SSHException, AuthenticationException
|
|
from paramiko.message import Message
|
|
from paramiko.pkey import PKey
|
|
from paramiko.util import retry_on_signal
|
|
|
|
cSSH2_AGENTC_REQUEST_IDENTITIES = byte_chr(11)
|
|
SSH2_AGENT_IDENTITIES_ANSWER = 12
|
|
cSSH2_AGENTC_SIGN_REQUEST = byte_chr(13)
|
|
SSH2_AGENT_SIGN_RESPONSE = 14
|
|
|
|
|
|
class AgentSSH(object):
|
|
def __init__(self):
|
|
self._conn = None
|
|
self._keys = ()
|
|
|
|
def get_keys(self):
|
|
"""
|
|
Return the list of keys available through the SSH agent, if any. If
|
|
no SSH agent was running (or it couldn't be contacted), an empty list
|
|
will be returned.
|
|
|
|
:return:
|
|
a tuple of `.AgentKey` objects representing keys available on the
|
|
SSH agent
|
|
"""
|
|
return self._keys
|
|
|
|
def _connect(self, conn):
|
|
self._conn = conn
|
|
ptype, result = self._send_message(cSSH2_AGENTC_REQUEST_IDENTITIES)
|
|
if ptype != SSH2_AGENT_IDENTITIES_ANSWER:
|
|
raise SSHException("could not get keys from ssh-agent")
|
|
keys = []
|
|
for i in range(result.get_int()):
|
|
keys.append(AgentKey(self, result.get_binary()))
|
|
result.get_string()
|
|
self._keys = tuple(keys)
|
|
|
|
def _close(self):
|
|
if self._conn is not None:
|
|
self._conn.close()
|
|
self._conn = None
|
|
self._keys = ()
|
|
|
|
def _send_message(self, msg):
|
|
msg = asbytes(msg)
|
|
self._conn.send(struct.pack(">I", len(msg)) + msg)
|
|
l = self._read_all(4)
|
|
msg = Message(self._read_all(struct.unpack(">I", l)[0]))
|
|
return ord(msg.get_byte()), msg
|
|
|
|
def _read_all(self, wanted):
|
|
result = self._conn.recv(wanted)
|
|
while len(result) < wanted:
|
|
if len(result) == 0:
|
|
raise SSHException("lost ssh-agent")
|
|
extra = self._conn.recv(wanted - len(result))
|
|
if len(extra) == 0:
|
|
raise SSHException("lost ssh-agent")
|
|
result += extra
|
|
return result
|
|
|
|
|
|
class AgentProxyThread(threading.Thread):
|
|
"""
|
|
Class in charge of communication between two channels.
|
|
"""
|
|
|
|
def __init__(self, agent):
|
|
threading.Thread.__init__(self, target=self.run)
|
|
self._agent = agent
|
|
self._exit = False
|
|
|
|
def run(self):
|
|
try:
|
|
(r, addr) = self.get_connection()
|
|
# Found that r should be either
|
|
# a socket from the socket library or None
|
|
self.__inr = r
|
|
# The address should be an IP address as a string? or None
|
|
self.__addr = addr
|
|
self._agent.connect()
|
|
if not isinstance(self._agent, int) and (
|
|
self._agent._conn is None
|
|
or not hasattr(self._agent._conn, "fileno")
|
|
):
|
|
raise AuthenticationException("Unable to connect to SSH agent")
|
|
self._communicate()
|
|
except:
|
|
# XXX Not sure what to do here ... raise or pass ?
|
|
raise
|
|
|
|
def _communicate(self):
|
|
import fcntl
|
|
|
|
oldflags = fcntl.fcntl(self.__inr, fcntl.F_GETFL)
|
|
fcntl.fcntl(self.__inr, fcntl.F_SETFL, oldflags | os.O_NONBLOCK)
|
|
while not self._exit:
|
|
events = select([self._agent._conn, self.__inr], [], [], 0.5)
|
|
for fd in events[0]:
|
|
if self._agent._conn == fd:
|
|
data = self._agent._conn.recv(512)
|
|
if len(data) != 0:
|
|
self.__inr.send(data)
|
|
else:
|
|
self._close()
|
|
break
|
|
elif self.__inr == fd:
|
|
data = self.__inr.recv(512)
|
|
if len(data) != 0:
|
|
self._agent._conn.send(data)
|
|
else:
|
|
self._close()
|
|
break
|
|
time.sleep(io_sleep)
|
|
|
|
def _close(self):
|
|
self._exit = True
|
|
self.__inr.close()
|
|
self._agent._conn.close()
|
|
|
|
|
|
class AgentLocalProxy(AgentProxyThread):
|
|
"""
|
|
Class to be used when wanting to ask a local SSH Agent being
|
|
asked from a remote fake agent (so use a unix socket for ex.)
|
|
"""
|
|
|
|
def __init__(self, agent):
|
|
AgentProxyThread.__init__(self, agent)
|
|
|
|
def get_connection(self):
|
|
"""
|
|
Return a pair of socket object and string address.
|
|
|
|
May block!
|
|
"""
|
|
conn = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
|
|
try:
|
|
conn.bind(self._agent._get_filename())
|
|
conn.listen(1)
|
|
(r, addr) = conn.accept()
|
|
return r, addr
|
|
except:
|
|
raise
|
|
|
|
|
|
class AgentRemoteProxy(AgentProxyThread):
|
|
"""
|
|
Class to be used when wanting to ask a remote SSH Agent
|
|
"""
|
|
|
|
def __init__(self, agent, chan):
|
|
AgentProxyThread.__init__(self, agent)
|
|
self.__chan = chan
|
|
|
|
def get_connection(self):
|
|
return self.__chan, None
|
|
|
|
|
|
class AgentClientProxy(object):
|
|
"""
|
|
Class proxying request as a client:
|
|
|
|
#. client ask for a request_forward_agent()
|
|
#. server creates a proxy and a fake SSH Agent
|
|
#. server ask for establishing a connection when needed,
|
|
calling the forward_agent_handler at client side.
|
|
#. the forward_agent_handler launch a thread for connecting
|
|
the remote fake agent and the local agent
|
|
#. Communication occurs ...
|
|
"""
|
|
|
|
def __init__(self, chanRemote):
|
|
self._conn = None
|
|
self.__chanR = chanRemote
|
|
self.thread = AgentRemoteProxy(self, chanRemote)
|
|
self.thread.start()
|
|
|
|
def __del__(self):
|
|
self.close()
|
|
|
|
def connect(self):
|
|
"""
|
|
Method automatically called by ``AgentProxyThread.run``.
|
|
"""
|
|
if ("SSH_AUTH_SOCK" in os.environ) and (sys.platform != "win32"):
|
|
conn = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
|
|
try:
|
|
retry_on_signal(
|
|
lambda: conn.connect(os.environ["SSH_AUTH_SOCK"])
|
|
)
|
|
except:
|
|
# probably a dangling env var: the ssh agent is gone
|
|
return
|
|
elif sys.platform == "win32":
|
|
import paramiko.win_pageant as win_pageant
|
|
|
|
if win_pageant.can_talk_to_agent():
|
|
conn = win_pageant.PageantConnection()
|
|
else:
|
|
return
|
|
else:
|
|
# no agent support
|
|
return
|
|
self._conn = conn
|
|
|
|
def close(self):
|
|
"""
|
|
Close the current connection and terminate the agent
|
|
Should be called manually
|
|
"""
|
|
if hasattr(self, "thread"):
|
|
self.thread._exit = True
|
|
self.thread.join(1000)
|
|
if self._conn is not None:
|
|
self._conn.close()
|
|
|
|
|
|
class AgentServerProxy(AgentSSH):
|
|
"""
|
|
:param .Transport t: Transport used for SSH Agent communication forwarding
|
|
|
|
:raises: `.SSHException` -- mostly if we lost the agent
|
|
"""
|
|
|
|
def __init__(self, t):
|
|
AgentSSH.__init__(self)
|
|
self.__t = t
|
|
self._dir = tempfile.mkdtemp("sshproxy")
|
|
os.chmod(self._dir, stat.S_IRWXU)
|
|
self._file = self._dir + "/sshproxy.ssh"
|
|
self.thread = AgentLocalProxy(self)
|
|
self.thread.start()
|
|
|
|
def __del__(self):
|
|
self.close()
|
|
|
|
def connect(self):
|
|
conn_sock = self.__t.open_forward_agent_channel()
|
|
if conn_sock is None:
|
|
raise SSHException("lost ssh-agent")
|
|
conn_sock.set_name("auth-agent")
|
|
self._connect(conn_sock)
|
|
|
|
def close(self):
|
|
"""
|
|
Terminate the agent, clean the files, close connections
|
|
Should be called manually
|
|
"""
|
|
os.remove(self._file)
|
|
os.rmdir(self._dir)
|
|
self.thread._exit = True
|
|
self.thread.join(1000)
|
|
self._close()
|
|
|
|
def get_env(self):
|
|
"""
|
|
Helper for the environnement under unix
|
|
|
|
:return:
|
|
a dict containing the ``SSH_AUTH_SOCK`` environnement variables
|
|
"""
|
|
return {"SSH_AUTH_SOCK": self._get_filename()}
|
|
|
|
def _get_filename(self):
|
|
return self._file
|
|
|
|
|
|
class AgentRequestHandler(object):
|
|
"""
|
|
Primary/default implementation of SSH agent forwarding functionality.
|
|
|
|
Simply instantiate this class, handing it a live command-executing session
|
|
object, and it will handle forwarding any local SSH agent processes it
|
|
finds.
|
|
|
|
For example::
|
|
|
|
# Connect
|
|
client = SSHClient()
|
|
client.connect(host, port, username)
|
|
# Obtain session
|
|
session = client.get_transport().open_session()
|
|
# Forward local agent
|
|
AgentRequestHandler(session)
|
|
# Commands executed after this point will see the forwarded agent on
|
|
# the remote end.
|
|
session.exec_command("git clone https://my.git.repository/")
|
|
"""
|
|
|
|
def __init__(self, chanClient):
|
|
self._conn = None
|
|
self.__chanC = chanClient
|
|
chanClient.request_forward_agent(self._forward_agent_handler)
|
|
self.__clientProxys = []
|
|
|
|
def _forward_agent_handler(self, chanRemote):
|
|
self.__clientProxys.append(AgentClientProxy(chanRemote))
|
|
|
|
def __del__(self):
|
|
self.close()
|
|
|
|
def close(self):
|
|
for p in self.__clientProxys:
|
|
p.close()
|
|
|
|
|
|
class Agent(AgentSSH):
|
|
"""
|
|
Client interface for using private keys from an SSH agent running on the
|
|
local machine. If an SSH agent is running, this class can be used to
|
|
connect to it and retrieve `.PKey` objects which can be used when
|
|
attempting to authenticate to remote SSH servers.
|
|
|
|
Upon initialization, a session with the local machine's SSH agent is
|
|
opened, if one is running. If no agent is running, initialization will
|
|
succeed, but `get_keys` will return an empty tuple.
|
|
|
|
:raises: `.SSHException` --
|
|
if an SSH agent is found, but speaks an incompatible protocol
|
|
"""
|
|
|
|
def __init__(self):
|
|
AgentSSH.__init__(self)
|
|
|
|
if ("SSH_AUTH_SOCK" in os.environ) and (sys.platform != "win32"):
|
|
conn = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
|
|
try:
|
|
conn.connect(os.environ["SSH_AUTH_SOCK"])
|
|
except:
|
|
# probably a dangling env var: the ssh agent is gone
|
|
return
|
|
elif sys.platform == "win32":
|
|
from . import win_pageant
|
|
|
|
if win_pageant.can_talk_to_agent():
|
|
conn = win_pageant.PageantConnection()
|
|
else:
|
|
return
|
|
else:
|
|
# no agent support
|
|
return
|
|
self._connect(conn)
|
|
|
|
def close(self):
|
|
"""
|
|
Close the SSH agent connection.
|
|
"""
|
|
self._close()
|
|
|
|
|
|
class AgentKey(PKey):
|
|
"""
|
|
Private key held in a local SSH agent. This type of key can be used for
|
|
authenticating to a remote server (signing). Most other key operations
|
|
work as expected.
|
|
"""
|
|
|
|
def __init__(self, agent, blob):
|
|
self.agent = agent
|
|
self.blob = blob
|
|
self.public_blob = None
|
|
self.name = Message(blob).get_text()
|
|
|
|
def asbytes(self):
|
|
return self.blob
|
|
|
|
def __str__(self):
|
|
return self.asbytes()
|
|
|
|
def get_name(self):
|
|
return self.name
|
|
|
|
def sign_ssh_data(self, data):
|
|
msg = Message()
|
|
msg.add_byte(cSSH2_AGENTC_SIGN_REQUEST)
|
|
msg.add_string(self.blob)
|
|
msg.add_string(data)
|
|
msg.add_int(0)
|
|
ptype, result = self.agent._send_message(msg)
|
|
if ptype != SSH2_AGENT_SIGN_RESPONSE:
|
|
raise SSHException("key cannot be used for signing")
|
|
return result.get_binary()
|