716 lines
24 KiB
Python
Executable file
716 lines
24 KiB
Python
Executable file
#!/usr/bin/python3
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# -*- coding: utf-8 -*-
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#
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# Ereshkigal is an AutoSSH tunnel monitor
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# It gives a curses user interface to monitor existing SSH tunnel that are managed with autossh.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# Author : nojhan <nojhan@nojhan.net>
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#
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#################################################################################################
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# CORE
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#################################################################################################
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import os
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import subprocess
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import logging
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import psutil
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import socket
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import re
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class Tunnel:
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def __init__(self, ssh_pid = None, in_port = None, via_host = None, target_host = None, out_port = None):
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# assert(ssh_pid != None)
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self.ssh_pid = ssh_pid
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assert(in_port!=None)
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self.in_port = in_port
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assert(via_host!=None)
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self.via_host = via_host
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assert(target_host!=None)
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self.target_host = target_host
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assert(out_port!=None)
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self.out_port = out_port
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self.connections = []
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def repr_tunnel(self):
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return "%i\t%i\t%s\t%s\t%i" % (
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self.ssh_pid,
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self.in_port,
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self.via_host,
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self.target_host,
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self.out_port)
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def repr_connections(self):
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# list of tunnels linked to this process
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rep = ""
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for c in self.connections:
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rep += "\n↳\t%s" % c
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return rep
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def __repr__(self):
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return self.repr_tunnel() + self.repr_connections()
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class AutoTunnel(Tunnel):
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def __init__(self, autossh_pid = None, *args, **kwargs):
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super().__init__(*args, **kwargs)
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assert(autossh_pid!=None)
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self.autossh_pid = autossh_pid
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def repr_tunnel(self):
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rep = super().repr_tunnel()
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return "auto\t" + rep
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class RawTunnel(Tunnel):
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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def repr_tunnel(self):
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rep = super().repr_tunnel()
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return "ssh\t" + rep
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class Connection:
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"""A dictionary that stores an SSH connection related to a tunnel"""
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def __init__(self, local_address = None, local_port = None, foreign_address = None, foreign_port = None,
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status = None, family = None ):
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# informations available with netstat
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assert(local_address!=None)
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self.local_address = local_address
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assert(local_port!=None)
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self.local_port = local_port
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self.foreign_address = foreign_address
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self.foreign_port = foreign_port
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assert(status!=None)
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self.status = status
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assert(family!=None)
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self.family = family
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self.family_rep = {socket.AddressFamily.AF_INET:"INET", socket.AddressFamily.AF_INET6:"INET6", socket.AddressFamily.AF_UNIX:"UNIX"}
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# FIXME would be nice to have an estimation of the connections latency
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#self.latency = 0
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def __repr__(self):
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# do not logging.debug all the informations by default
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if self.foreign_address and self.foreign_port:
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return "%s:%i -> %s:%i\t%s\t%s" % (
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self.local_address,
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self.local_port,
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self.foreign_address,
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self.foreign_port,
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self.family_rep[self.family],
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self.status,
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)
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else:
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return "%s:%i\t%s\t%s" % (
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self.local_address,
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self.local_port,
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self.family_rep[self.family],
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self.status,
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)
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class TunnelsParser:
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def __init__(self):
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"""Warning: the initialization does not gather tunnels informations, use update() to do so"""
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# { ssh_pid : Tunnel }
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self.tunnels = {}
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# do not perform update by default
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# this is necessary because one may want
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# only a list of connections OR autossh processes
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#self.update()
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self.re_forwarding = re.compile(r"-L(\d+):(.+):(\d+)")
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self.header = 'TYPE\tPID\tIN_PORT\tVIA_HOST\tTARGET_HOST\tOUT_PORT'
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def parse(self, cmd):
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cmdline = " ".join(cmd)
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logging.debug('autossh cmd line:', cmdline)
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logging.debug('forwarding regexp:', self.re_forwarding)
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match = self.re_forwarding.findall(cmdline)
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logging.debug(match)
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if match:
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assert(len(match)==1)
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in_port, target_host, out_port = match[0]
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logging.debug("matches: ", match)
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# Find the hostname on wich the tunnel is built.
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via_host = "unknown"
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# Search backward and take the first parameter argument.
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# FIXME this is an ugly hack
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for i in range( len(cmd)-1,0,-1 ):
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if cmd[i][0] != '-':
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via_host = cmd[i]
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break
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return (int(in_port), via_host, target_host, int(out_port))
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def update(self):
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"""Gather and parse informations from the operating system"""
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self.tunnels.clear()
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# Browse the SSH processes handling a tunnel.
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for proc in psutil.process_iter():
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try:
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process = proc.as_dict(attrs=['pid','ppid','name','cmdline','connections'])
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cmd = process['cmdline']
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except psutil.NoSuchProcess:
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pass
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else:
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if process['name'] == 'ssh':
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logging.debug(process)
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in_port, via_host, target_host, out_port = self.parse(cmd)
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logging.debug(in_port, via_host, target_host, out_port)
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# Check if this ssh tunnel is managed by autossh.
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parent = psutil.Process(process['ppid'])
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if parent.name() == 'autossh':
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# Add an autossh tunnel.
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pid = parent.pid # autossh pid
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self.tunnels[pid] = AutoTunnel(pid, process['pid'], in_port, via_host, target_host, out_port )
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else:
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# Add a raw tunnel.
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pid = process['pid']
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self.tunnels[pid] = RawTunnel(pid, in_port, via_host, target_host, out_port )
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for c in process['connections']:
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logging.debug(c)
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laddr,lport = c.laddr
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if c.raddr:
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raddr,rport = c.raddr
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else:
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raddr,rport = (None,None)
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connection = Connection(laddr,lport,raddr,rport,c.status,c.family)
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logging.debug(connection)
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self.tunnels[pid].connections.append(connection)
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logging.debug(self.tunnels)
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def __repr__(self):
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reps = [self.header]
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for t in self.tunnels:
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reps.append(str(self.tunnels[t]))
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return "\n".join(reps)
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#################################################################################################
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# INTERFACES
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#################################################################################################
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import curses
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import time
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import signal
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class monitorCurses:
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"""Textual user interface to display up-to-date informations about current tunnels"""
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def __init__(self, scr):
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# curses screen
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self.scr = scr
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# tunnels monitor
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self.tm = TunnelMonitor()
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# selected line
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self.cur_line = -1
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# selected pid
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self.cur_pid = -1
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# switch to show only autoss processes (False) or ssh connections also (True)
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self.show_tunnels = False
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# FIXME pass as parameters+options
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self.update_delay = 1 # seconds of delay between two data updates
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self.ui_delay = 0.05 # seconds between two screen update
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# colors
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# FIXME different colors for different types of tunnels (auto or raw)
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self.colors_tunnel = {'kind':4, 'pid':0, 'local_port':3, 'via_host':2, 'target_host':2, 'foreign_port':3, 'tunnels_nb':4, 'tunnels_nb_none':1}
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self.colors_highlight = {'kind':9, 'pid':9, 'local_port':9, 'via_host':9, 'target_host':9, 'foreign_port':9, 'tunnels_nb':9, 'tunnels_nb_none':9}
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self.colors_connection = {'ssh_pid':0, 'status':4, 'status_out':1, 'local_address':2, 'local_port':3, 'foreign_address':2, 'foreign_port':3}
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def __call__(self):
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"""Start the interface"""
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self.scr.clear() # clear all
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self.scr.nodelay(1) # non-bloking getch
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# first display
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self.display()
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# first update counter
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last_update = time.clock()
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last_state = None
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log_ticks = ""
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# infinite loop
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while(1):
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# wait some time
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# necessary to not overload the system with unnecessary calls
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time.sleep( self.ui_delay )
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# if its time to update
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if time.time() > last_update + self.update_delay:
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self.tm.update()
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# reset the counter
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last_update = time.time()
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state = "%s" % self.tm
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if state != last_state:
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logging.debug("Waited: %s" % log_ticks)
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log_ticks = ""
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logging.debug("----- Time of screen update: %s -----" % time.time())
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logging.debug("State of tunnels:\n%s" % self.tm)
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last_state = state
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else:
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log_ticks += "."
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kc = self.scr.getch() # keycode
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if kc != -1: # if keypress
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pass
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ch = chr(0)
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if 0 < kc < 256: # if ascii key
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# ascii character from the keycode
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ch = chr(kc)
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# Quit
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if ch in 'Qq':
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logging.debug("Waited: %s" % log_ticks)
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log_ticks = ""
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logging.debug("Key pushed: Q")
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break
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# Reload related autossh tunnels
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elif ch in 'rR':
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logging.debug("Waited: %s" % log_ticks)
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log_ticks = ""
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logging.debug("Key pushed: R")
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# if a pid is selected
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if self.cur_pid != -1:
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# send the SIGUSR1 signal
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if self.tm[self.cur_line]['kind'] == 'auto':
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# autossh performs a reload of existing tunnels that it manages
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logging.debug("SIGUSR1 on PID: %i" % self.cur_pid)
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os.kill( self.cur_pid, signal.SIGUSR1 )
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else:
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logging.debug("Cannot reload a RAW tunnel")
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# Kill autossh process
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elif ch in 'kK':
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logging.debug("Waited: %s" % log_ticks)
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log_ticks = ""
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logging.debug("Key pushed: K")
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if self.cur_pid != -1:
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# send a SIGKILL
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# the related process is stopped
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# FIXME SIGTERM or SIGKILL ?
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# tunnel = self.tm[self.cur_line]
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# if tunnel['kind'] == 'auto':
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# # FIXME kill SSH first
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# logging.debug("SIGKILL on ssh PID: %i" % tunnel['ssh_pid'])
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# try:
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# os.kill( tunnel['ssh_pid'], signal.SIGKILL )
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# except OSError:
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# logging.error("No such process: %i" % tunnel['ssh_pid'])
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logging.debug("SIGKILL on autossh PID: %i" % self.cur_pid)
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try:
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os.kill( self.cur_pid, signal.SIGKILL )
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except OSError:
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logging.error("No such process: %i" % self.cur_pid)
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# Switch to show ssh connections
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# only available for root
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elif ch in 'tT' and os.getuid() == 0:
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logging.debug("Waited: %s" % log_ticks)
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log_ticks = ""
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logging.debug("Key pushed: T")
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self.show_tunnels = not self.show_tunnels
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# key pushed
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elif kc == curses.KEY_DOWN:
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logging.debug("Waited: %s" % log_ticks)
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log_ticks = ""
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logging.debug("Key pushed: down")
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# if not the end of the list
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if self.cur_line < len(self.tm)-1:
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self.cur_line += 1
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# get the pid
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self.cur_pid = int(self.tm[self.cur_line]['pid'])
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# key up
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elif kc == curses.KEY_UP:
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logging.debug("Waited: %s" % log_ticks)
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log_ticks = ""
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logging.debug("Key pushed: up")
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if self.cur_line > -1:
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self.cur_line -= 1
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if self.cur_line > 0:
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self.cur_pid = int(self.tm[self.cur_line]['pid'])
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else:
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# do nothing and wait until the next refresh
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pass
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# update the display
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self.display()
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# force a screen refresh
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self.scr.refresh()
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# end of the loop
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def display(self):
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"""Generate the interface screen"""
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# First line: help
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help_msg = "[R]:reload autossh [K]:kill tunnel [Q]:quit"
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if os.geteuid() == 0:
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help_msg += " [T]:show network connections"
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help_msg += '\n'
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self.scr.addstr(0,0, help_msg, curses.color_pair(4) )
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self.scr.clrtoeol()
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# Second line
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self.scr.addstr( "Active tunnels: ", curses.color_pair(6) )
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self.scr.addstr( str( len(self.tm) ), curses.color_pair(1) )
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self.scr.addstr( " / Active connections: ", curses.color_pair(6) )
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self.scr.addstr( str( sum([len(i['connections']) for i in self.tm]) ), curses.color_pair(1) )
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self.scr.addstr( '\n', curses.color_pair(1) )
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self.scr.clrtoeol()
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# if no line is selected
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color = 0
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if self.cur_line==-1:
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# selected color for the header
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color = 9
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self.cur_pid = -1
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# header line
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header_msg = "TYPE\tPID \tINPORT\tVIA \tTARGET \tOUTPORT"
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if os.geteuid() == 0:
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header_msg += "\tCONNECTIONS"
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self.scr.addstr( header_msg, curses.color_pair(color) )
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self.scr.clrtoeol()
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# for each autossh processes available in the monitor
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for l in range(len(self.tm)):
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# add a line for the l-th autossh process
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self.add_autossh( l )
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# if one want to show connections
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if self.show_tunnels and os.getuid() == 0:
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self.add_connection( l )
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self.scr.clrtobot()
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def add_connection(self, line ):
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"""Add lines for each connections related to the l-th autossh process"""
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colors = self.colors_connection
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# for each connections related to te line-th autossh process
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for t in self.tm[line]['connections']:
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# FIXME fail if the screen's height is too small.
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self.scr.addstr( '\n\t+ ' )
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# self.scr.addstr( str( t['ssh_pid'] ), curses.color_pair(colors['ssh_pid'] ) )
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# self.scr.addstr( '\t' )
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self.scr.addstr( str( t['local_address'] ) , curses.color_pair(colors['local_address'] ))
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self.scr.addstr( ':' )
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self.scr.addstr( str( t['local_port'] ) , curses.color_pair(colors['local_port'] ))
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self.scr.addstr( ' -> ' )
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self.scr.addstr( str( t['foreign_address'] ) , curses.color_pair(colors['foreign_address'] ))
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self.scr.addstr( ':' )
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self.scr.addstr( str( t['foreign_port'] ) , curses.color_pair(colors['foreign_port'] ))
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self.scr.addstr( '\t' )
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color = self.colors_connection['status']
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# if the connections is established
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# TODO avoid hard-coded constants
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if t['status'] != 'ESTABLISHED':
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color = self.colors_connection['status_out']
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self.scr.addstr( t['status'], curses.color_pair( color ) )
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self.scr.clrtoeol()
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def add_autossh(self, line):
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"""Add line corresponding to the line-th autossh process"""
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self.scr.addstr( '\n' )
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self.add_autossh_info('kind', line)
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self.add_autossh_info('pid', line)
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self.add_autossh_info('local_port', line)
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self.add_autossh_info('via_host', line)
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self.add_autossh_info('target_host', line)
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self.add_autossh_info('foreign_port', line)
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nb = len(self.tm[line]['connections'] )
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if nb > 0:
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# for each connection related to this process
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for i in self.tm[line]['connections']:
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# add a vertical bar |
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# the color change according to the status of the connection
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if i['status'] == 'ESTABLISHED':
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self.scr.addstr( '|', curses.color_pair(self.colors_connection['status']) )
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else:
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self.scr.addstr( '|', curses.color_pair(self.colors_connection['status_out']) )
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else:
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if os.geteuid() == 0:
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# if there is no connection, display a "None"
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|
self.scr.addstr( 'None', curses.color_pair(self.colors_tunnel['tunnels_nb_none']) )
|
|
|
|
self.scr.clrtoeol()
|
|
|
|
def add_autossh_info( self, key, line ):
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|
"""Add an information of an autossh process, in the configured color"""
|
|
|
|
colors = self.colors_tunnel
|
|
# if the line is selected
|
|
if self.cur_line == line:
|
|
# set the color to the highlight one
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|
colors = self.colors_highlight
|
|
|
|
txt = str(self.tm[line][key])
|
|
if key == 'target_host' or key == 'via_host':
|
|
# limit the size of the line to 20
|
|
# TODO avoid hard-coded constants
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|
txt = str(self.tm[line][key]).ljust(20)[:20]
|
|
|
|
self.scr.addstr( txt, curses.color_pair(colors[key]) )
|
|
self.scr.addstr( '\t', curses.color_pair(colors[key]) )
|
|
|
|
|
|
|
|
if __name__ == "__main__":
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|
import sys
|
|
from optparse import OptionParser
|
|
import configparser
|
|
|
|
usage = """%prog [options]
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|
A user interface to monitor existing SSH tunnel that are managed with autossh.
|
|
Called without options, ereshkigal displays a list of tunnels on the standard output.
|
|
Note: Users other than root will not see tunnels connections.
|
|
Version 0.3"""
|
|
parser = OptionParser(usage=usage)
|
|
|
|
parser.add_option("-c", "--curses",
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|
action="store_true", default=False,
|
|
help="Start the user interface in text mode.")
|
|
|
|
parser.add_option("-n", "--connections",
|
|
action="store_true", default=False,
|
|
help="Display only SSH connections related to a tunnel.")
|
|
|
|
parser.add_option("-u", "--tunnels",
|
|
action="store_true", default=False,
|
|
help="Display only the list of tunnels processes.")
|
|
|
|
LOG_LEVELS = {'error' : logging.ERROR,
|
|
'warning' : logging.WARNING,
|
|
'debug' : logging.DEBUG}
|
|
|
|
parser.add_option('-l', '--log-level', choices=list(LOG_LEVELS), default='error', metavar='LEVEL',
|
|
help='Log level (%s), default: %s.' % (", ".join(LOG_LEVELS), 'error') )
|
|
|
|
parser.add_option('-g', '--log-file', default=None, metavar='FILE',
|
|
help="Log to this file, default to standard output. \
|
|
If you use the curses interface, you may want to set this to actually see logs.")
|
|
|
|
parser.add_option('-f', '--config-file', default=None, metavar='FILE',
|
|
help="Use this configuration file (default: '~/.ereshkigal.conf')")
|
|
|
|
(asked_for, args) = parser.parse_args()
|
|
|
|
logmsg = "----- Started Ereshkigal -----"
|
|
|
|
if asked_for.log_file:
|
|
logfile = asked_for.log_file
|
|
logging.basicConfig(filename=logfile, level=LOG_LEVELS[asked_for.log_level])
|
|
logging.debug(logmsg)
|
|
logging.debug("Log in %s" % logfile)
|
|
else:
|
|
if asked_for.curses:
|
|
logging.warning("It's a bad idea to log to stdout while in the curses interface.")
|
|
logging.basicConfig(level=LOG_LEVELS[asked_for.log_level])
|
|
logging.debug(logmsg)
|
|
logging.debug("Log to stdout")
|
|
|
|
logging.debug("Asked for: %s" % asked_for)
|
|
|
|
# unfortunately, asked_for class has no __len__ method in python 2.4.3 (bug?)
|
|
#if len(asked_for) > 1:
|
|
# parser.error("asked_for are mutually exclusive")
|
|
|
|
config = configparser.ConfigParser()
|
|
if asked_for.config_file:
|
|
try:
|
|
config.read(asked_for.config_file)
|
|
except configparser.MissingSectionHeaderError:
|
|
logging.error("'%s' contains no known configuration" % asked_for.config_file)
|
|
else:
|
|
try:
|
|
config.read('~/.ereshkigal.conf')
|
|
except configparser.MissingSectionHeaderError:
|
|
logging.error("'%s' contains no known configuration" % asked_for.config_file)
|
|
|
|
# Load autossh instances by sections: [expected]
|
|
# if config['expected']:
|
|
|
|
|
|
|
|
if asked_for.curses:
|
|
logging.debug("Entering curses mode")
|
|
import curses
|
|
import traceback
|
|
|
|
try:
|
|
scr = curses.initscr()
|
|
curses.start_color()
|
|
|
|
# 0:black, 1:red, 2:green, 3:yellow, 4:blue, 5:magenta, 6:cyan, 7:white
|
|
curses.init_pair(1, curses.COLOR_RED, curses.COLOR_BLACK)
|
|
curses.init_pair(2, curses.COLOR_GREEN, curses.COLOR_BLACK)
|
|
curses.init_pair(3, curses.COLOR_YELLOW, curses.COLOR_BLACK)
|
|
curses.init_pair(4, curses.COLOR_BLUE, curses.COLOR_BLACK)
|
|
curses.init_pair(5, curses.COLOR_MAGENTA, curses.COLOR_BLACK)
|
|
curses.init_pair(6, curses.COLOR_CYAN, curses.COLOR_BLACK)
|
|
curses.init_pair(7, curses.COLOR_WHITE, curses.COLOR_BLACK)
|
|
curses.init_pair(8, curses.COLOR_WHITE, curses.COLOR_GREEN)
|
|
curses.init_pair(9, curses.COLOR_WHITE, curses.COLOR_BLUE)
|
|
|
|
curses.noecho()
|
|
curses.cbreak()
|
|
scr.keypad(1)
|
|
|
|
# create the monitor
|
|
mc = monitorCurses( scr )
|
|
# call the monitor
|
|
mc()
|
|
|
|
scr.keypad(0)
|
|
curses.echo()
|
|
curses.nocbreak()
|
|
curses.endwin()
|
|
|
|
except:
|
|
# end cleanly
|
|
scr.keypad(0)
|
|
curses.echo()
|
|
curses.nocbreak()
|
|
curses.endwin()
|
|
|
|
# print the traceback
|
|
traceback.print_exc()
|
|
|
|
|
|
elif asked_for.connections:
|
|
logging.debug("Entering connections mode")
|
|
tp = TunnelsParser()
|
|
tp.update()
|
|
# do not call update() but only get connections
|
|
logging.debug("UID: %i." % os.geteuid())
|
|
# if os.geteuid() == 0:
|
|
for t in tp.tunnels:
|
|
for c in tp.tunnels[t].connections:
|
|
print(tp.tunnels[t].ssh_pid, c)
|
|
|
|
# else:
|
|
# logging.error("Only root can see SSH tunnels connections.")
|
|
|
|
|
|
elif asked_for.tunnels:
|
|
logging.debug("Entering tunnel mode")
|
|
tp = TunnelsParser()
|
|
tp.update()
|
|
# do not call update() bu only get autossh processes
|
|
print(tp.header)
|
|
for t in tp.tunnels:
|
|
if type(tp.tunnels[t]) == AutoTunnel:
|
|
print(tp.tunnels[t].repr_tunnel())
|
|
|
|
|
|
else:
|
|
logging.debug("Entering default mode")
|
|
tp = TunnelsParser()
|
|
# call update
|
|
tp.update()
|
|
# call the default __repr__
|
|
print(tp)
|
|
|
|
|
|
#
|
|
# In Mesopotamian mythology, Ereshkigal (lit. "great lady under earth")
|
|
# was the goddess of Irkalla, the land of the dead or underworld.
|
|
#
|
|
# Thus, she knows a lot about tunnels...
|
|
#
|
|
# http://en.wikipedia.org/wiki/Ereshkigal
|
|
#
|
|
|