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