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ssh-one-key-per-host
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ssh-one-key-per-host
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
ssh-one-key-per-host
-----------------------
Given a list of hostnames, generate an SSH key for each one, then print out
lines of ``allowed_hosts=[…]`` for each one, á la
https://db.torproject.org/doc-mail.html or https://db.debian.org/doc-mail.html
style.
:author: Isis <isis@patternsinthevoid.net> 0x0A6A58A14B5946ABDE18E207A3ADB67A2CDB8B35
:version: 0.0.1
:license: MIT
:copyright: © 2017 Isis Agora Lovecruft
"""
from __future__ import print_function
from __future__ import unicode_literals
import argparse
import logging
import os
import re
import requests
import subprocess
import sys
SSH_DIR = os.path.expanduser("~/.ssh")
URL = "https://db.torproject.org/machines.cgi"
REGEX = "host=[a-z]*\">([a-z]*\.torproject\.org)"
log = logging.getLogger()
def _get_args():
parser = argparse.ArgumentParser()
parser.add_argument('-m', '--hosts',
help=("Comma separated list of hosts"))
parser.add_argument('-d', '--dir',
help=("SSH config directory to place new keys into "
"(default: %s)" % SSH_DIR))
parser.add_argument('-c', '--clobber', action='store_true',
help=("Overwrite ssh keyfiles in DIR"))
parser.add_argument('-C', '--comment',
help=("Comment for all new ssh keys"))
parser.add_argument('-p', '--password', action='store_true',
help=("Ask for a password once, for all new ssh keys "))
fetch_group = parser.add_argument_group(title='Fetching',
description="Options for fetching available hosts")
fetch_group.add_argument('-u', '--url', help=("A URL to parse for hostnames, "
"use -r to specify a regex to "
"parse (default: %s)" % URL))
fetch_group.add_argument('-r', '--regex', help=("A regex to parse the URL for hostnames "
"(default: %s)" % REGEX))
log_group = parser.add_argument_group(title='Logging',
description="Options and settings for logging")
log_group.add_argument('--stderr', action='store_true', help="Log to stderr")
log_group.add_argument('--stdout', action='store_true', help="Log to stdout")
log_group.add_argument('--logfile', help="Log to file")
log_group.add_argument('--loglevel', help="Log level", default="INFO",
choices=["DEBUG", "INFO", "WARN", "ERROR", "CRITICAL"])
args = parser.parse_args()
return args
def fetch_and_parse_url(url, regex):
logging.info("Fetching %s ..." % url)
try:
req = requests.get(url)
except requests.exceptions.ConnectionError as err:
logging.error("Could not connect to %s: %s" % (url, err.msg))
raise SystemExit(2)
if req.status_code != 200:
logging.error("There was an error requesting the URL %s: %s %s"
% (url, req.status_code, req.reason))
raise SystemExit(2)
logging.debug("Parsing response...")
regexp = re.compile(regex)
matches = list(set(regexp.findall(req.content)))
logging.debug("Found %d matches: %s" % (len(matches), matches))
return matches
def create_key_for_host(host, password=None, comment=None, ssh_dir=None):
keytype = "ed25519"
hostname_regex = re.compile("([a-z]*)\.([a-z]*)\.[a-z]*")
hostname, domain = hostname_regex.findall(host)[0]
filename = os.path.sep.join([ssh_dir, "id_%s_%s_%s" % (keytype, domain, hostname)])
args = [
"ssh-keygen",
"-t", "%s" % keytype,
"-N", "%s" % password,
"-f", "%s" % filename,
]
if comment:
args.append("-C")
args.append("%s" % comment)
logging.info("Generating key for %s..." % host)
proc = subprocess.Popen(args, shell=False,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
returncode = proc.wait()
if returncode:
logging.error("There was an error calling `%s`: %s"
% (' '.join(args), proc.stderr.read()))
else:
logging.debug(proc.stdout.read())
return "%s.pub" % filename
def print_allowed_hosts_lines(pubkeys):
for (host, pubkey_file) in pubkeys:
with open(pubkey_file) as fh:
pubkey = fh.read()
print("allowed_hosts=%s %s" % (host, pubkey))
def print_ssh_config_lines(pubkeys):
for (host, pubkey_file) in pubkeys:
print("Host tor-%s\n Hostname %s\n IdentityFile %s\n"
% (host.split('.', 1)[0], host, pubkey_file))
def main(args):
hosts = []
pubkeys = []
if args.logfile:
log.addHandler(logging.FileHandler(args.logfile))
elif args.stderr:
log.addHandler(logging.StreamHandler(sys.stderr))
elif args.stdout:
log.addHandler(logging.StreamHandler(sys.stdout))
else:
log.addHandler(logging.StreamHandler(sys.stdout))
log.setLevel(logging._levelNames[args.loglevel])
password = ''
dir = SSH_DIR
if args.url:
hosts = fetch_and_parse_url(args.url or URL, args.regex or REGEX)
if args.hosts:
hosts.append(args.hosts)
if args.dir:
dir = os.path.expanduser(args.dir)
logging.info("Generating keys for %d hosts..." % len(hosts))
logging.debug("Generating keys for %s..." % " ".join(hosts))
if hosts:
if args.password:
password = raw_input("Please enter the new password for all generated keys: ")
for host in hosts:
pubkey_file = create_key_for_host(host,
password,
args.comment or '',
args.dir)
if pubkey_file:
pubkeys.append((host, pubkey_file))
logging.info("Generated %d keys in total" % len(pubkeys))
if pubkeys:
print_allowed_hosts_lines(pubkeys)
print_ssh_config_lines(pubkeys)
if __name__ == "__main__":
main(_get_args())