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connection-specific-ssh-config
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229
connection-specific-ssh-config
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#!/usr/bin/env python3
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#
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import configparser
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import json
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import logging
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import os
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import re
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import subprocess
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import sys
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import syslog
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#
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class SSHConfiger:
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#
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_action_interface = None
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_action_command = None
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#
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_config_file_path = None
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_targets = None
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_config = None
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#
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def __init__(self, action_interface, action_command, config_file_path):
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# Grab args
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self._action_interface = action_interface
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self._action_command = action_command
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self._config_file_path = config_file_path
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#
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def log(self, s):
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#
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print ("[SSHConfiger]", s)
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syslog.syslog("[SSHConfiger] " + s)
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#
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def complain(self, s):
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#
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syslog.syslog(syslog.LOG_ERR, "[SSHConfiger] " + s)
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print("[SSHConfiger]", s, file=sys.stderr)
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#
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def die(self, s):
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#
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self.complain(s)
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raise Exception(s)
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#
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def run(self):
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#
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self.log("Running for interface \""+ self._action_interface +"\": " + self._action_command)
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# Parse the config
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self.parse_config()
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# Grab the specified ssh directory
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if ( "ssh_dir" not in self._config.keys() ):
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self.die("Config file needs key \"ssh_dir\" inside \"config\" section")
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ssh_dir = self._config["ssh_dir"]
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# Determine which ssh config file we should use
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ssh_config_name = self.determine_ssh_config_name()
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# Make paths
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ssh_config_path_link = os.path.join(ssh_dir, "config")
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ssh_config_path_target = os.path.join(ssh_dir, ssh_config_name)
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self.log("Selecting source config file \"" + ssh_config_path_target + "\" for link \"" + ssh_config_path_link + "\"")
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# Don't run unless current ssh config is a symlink or not a file (for safety)
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self.require_symlink_or_none(ssh_config_path_link)
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# Set the symlink
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try:
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os.unlink(ssh_config_path_link)
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except:
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pass
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os.symlink(ssh_config_path_target, ssh_config_path_link)
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#
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self.log("Finished")
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#
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def require_symlink_or_none(self, file_path):
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#
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if ( not os.path.isfile(file_path) or os.path.islink(file_path) ):
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return True
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#
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self.die("For safety, we cannot continue if the target link exists and is a file (" + file_path + ")")
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#
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def determine_ssh_config_name(self):
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# Only run if an interface is coming up
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if ( self._action_command != "up" ):
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return None
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# Check each section
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found_ssh_config_name = None
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for section_name in self._targets:
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#
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section = self._targets[section_name]
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# Must match at least one interface
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if ( self._action_interface not in section["adapters"] ):
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continue
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#
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interface_ssid = self.get_interface_ssid(self._action_interface)
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# Must also match at least one SSID
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if ( interface_ssid not in section["ssids"] ):
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continue
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# Found a match!
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found_ssh_config_name = section["ssh_config_name"]
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# Didn't find anything? Go default ...
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if (found_ssh_config_name == None):
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if ( "default" in self._targets.keys() ):
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if ( "ssh_config_name" in self._targets["default"].keys() ):
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found_ssh_config_name = self._targets["default"]["ssh_config_name"]
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self.log("No matches found; Defaulting to:" + found_ssh_config_name)
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#
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return found_ssh_config_name
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#
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def get_interface_ssid(self, interface):
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#
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p = subprocess.Popen(["nmcli", "dev", "show", interface], stdout=subprocess.PIPE)
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(stdout, stderr) = p.communicate()
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stdout = stdout.decode()
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#
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r = re.compile("""^GENERAL.CONNECTION:\s+(?P<ssid>[^\s].+)$""", re.MULTILINE)
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match = r.search(stdout)
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return match.group("ssid")
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#
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def parse_config(self):
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#
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self.log("Parsing config: " + self._config_file_path)
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parser = configparser.ConfigParser()
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parser.read( self._config_file_path )
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# Attempt to grab global config
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if ( "config" not in parser.sections() ):
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self.die("config section not found")
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config = parser["config"]
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# Targets
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targets = {}
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for section in parser.sections():
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# Skip the config section
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if ( section == "config" ):
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continue
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#
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target = {
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"adapters" : [],
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"ssids" : []
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}
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# Adapters
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if ( parser.has_option(section, "adapters") ):
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target["adapters"] = json.loads( parser[section]["adapters"] )
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if ( parser.has_option(section, "adapter") ):
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target["adapters"].append( parser[section]["adapter"] )
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# SSIDs
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if ( parser.has_option(section, "ssids") ):
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target["ssids"] = json.loads( parser[section]["ssids"] )
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if ( parser.has_option(section, "ssid") ):
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target["ssids"].append( parser[section]["ssid"] )
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# ssh_config_name
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if ( parser.has_option(section, "ssh_config_name") ):
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target["ssh_config_name"] = parser[section]["ssh_config_name"]
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else:
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raise Exception("ssh_config_name key missing from section: " + section)
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#
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targets[section] = target
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#
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self._config = config
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self._targets = targets
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return True
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# Main Entry
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if (__name__ == "__main__"):
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# Script name
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script_name = sys.argv[0]
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# Network Manager action info
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action_interface = sys.argv[1]
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action_command = sys.argv[2]
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# Config file
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config_file_path = sys.argv[3]
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#
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configger = SSHConfiger(action_interface, action_command, config_file_path)
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configger.run()
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