230 lines
7.4 KiB
Python
230 lines
7.4 KiB
Python
#!/usr/bin/python3.4
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import os
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import json
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import sys
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import signal
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import logging
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import time
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import hashlib
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import threading
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import list_domains
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from docker import Client
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cert_path = '/data/haproxy'
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cert_file = cert_path + '/cert.pem'
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pid_file = '/haproxy.pid'
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delay = 10
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def hash_cert_file():
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"""Creates the sha256 hash of the certificate file for HAProxy. If the file
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does not exist, an empty string is returned.
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"""
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if not os.path.isfile(cert_file):
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return ''
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file_obj = open(cert_file, 'rb')
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hash_generator = hashlib.sha256()
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buf = file_obj.read(65536)
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while len(buf) > 0:
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hash_generator.update(buf)
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buf = file_obj.read(65536)
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return hash_generator.digest()
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def setup_logging():
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"""Sets up logging with a nice format"""
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logging.basicConfig(format='%(asctime)s [%(levelname)s]: %(message)s', level=logging.INFO)
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def get_pid():
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"""This function reads the process id from the given file and returns as int."""
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with open(pid_file, 'r') as file:
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return int(file.read())
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def kill_haproxy():
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"""Stops the currently running instance of HAProxy by issuing a kill signal to its pid."""
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logging.info('killing HAProxy')
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try:
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os.kill(get_pid(), signal.SIGKILL)
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except OSError:
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pass
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def start_haproxy_ssl():
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"""Start HAProxy with SSL activated. Returns True, if HAProxy is running, False otherwise."""
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kill_haproxy()
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logging.info('starting HAProxy with SSL')
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os.system('/usr/sbin/haproxy -f /haproxy_ssl.conf -p ' + pid_file)
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return is_haproxy_running()
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def start_haproxy():
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"""Start HAProxy without SSL activated. Returns True, if HAProxy is running, False otherwise."""
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kill_haproxy()
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logging.info('starting HAProxy without SSL')
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os.system('/usr/sbin/haproxy -f /haproxy.conf -p ' + pid_file)
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return is_haproxy_running()
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def is_haproxy_running():
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"""Check if HAProxy is running by sending a signal to its pid."""
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try:
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os.kill(get_pid(), 0)
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return True
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except OSError:
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return False
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def ssl_possible():
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"""Check if a certificate is available."""
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if not os.path.isfile(cert_file):
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return False
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else:
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return True
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def read_file(filename):
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file=open(filename, 'r')
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read_data = file.read()
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file.close()
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return read_data
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def write_file(filename, content):
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file=open(filename, 'w')
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file.write(content)
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file.close()
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def create_haproxy_cert():
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"""Combines the freshly created fullchain.pem and privkey.pem into /data/haproxy/cert.pem"""
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logging.info('updating %s', cert_file)
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# make sure the path exists...
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if not os.path.exists(cert_path):
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logging.info('creating cert_path path: %s', cert_path)
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os.mkdir(cert_path)
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# find the youngest directory
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youngest_modify_time = 0
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youngest_directory = ''
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for root, directories, files in os.walk('/data/config/live'):
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for directory in directories:
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modify_time = os.stat('/data/config/live/' + directory).st_mtime
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if modify_time > youngest_modify_time:
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youngest_modify_time = modify_time
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youngest_directory = directory
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youngest_directory = '/data/config/live/' + youngest_directory
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logging.info('using %s as base dir', youngest_directory)
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# read fullchain.pem and privkey.pem
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if not os.path.exists(youngest_directory + '/fullchain.pem') or not os.path.exists(youngest_directory + '/privkey.pem'):
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logging.info('either fullchain.pem or privkey.pem is missing.')
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return
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fullchain = read_file(youngest_directory + '/fullchain.pem')
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privkey = read_file(youngest_directory + '/privkey.pem')
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write_file(cert_file, fullchain + privkey)
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logging.info('file written')
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def create_cert_data_standalone(domains):
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if len(domains) == 0:
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logging.info('no domains for SSL found.')
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return
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domains = " -d ".join(domains)
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# we should use tls-sni-01 if ssl is already running!
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os.system(
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'/letsencrypt/letsencrypt-auto --config letsencrypt.conf certonly --http-01-port 54321 -d ' + domains)
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def cert_watcher():
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ssl_active = ssl_possible() and is_haproxy_running()
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cert_file_hash = hash_cert_file()
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while True:
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logging.info('ping')
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time.sleep(delay)
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if not ssl_active:
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if ssl_possible():
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# we should be able to start with SSL, but ...
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kill_haproxy()
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start_haproxy_ssl()
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if is_haproxy_running():
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# running with SSL succeeded
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cert_file_hash = hash_cert_file()
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logging.info('NON SSL -> SSL')
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ssl_active = True
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else:
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# something went wrong (maybe broken certificate) but without SSL we can run it
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start_haproxy()
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logging.info('NON SSL -> NON SSL')
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else:
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# currently not running with SSL but also no cert, so we do not attempt to start with SSL
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pass
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else:
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if cert_file_hash != hash_cert_file():
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# we are running with SSL and the certificate has changed so we need to restart haproxy
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logging.info('cert has changed')
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kill_haproxy()
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start_haproxy_ssl()
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if is_haproxy_running():
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# restart with SSL succeeded, update hash
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logging.info('SSL -> SSL')
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else:
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# restart with SSL failed, so we start without SSL again
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start_haproxy()
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logging.info('SSL -> NON SSL')
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ssl_active = False
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cert_file_hash = hash_cert_file()
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if __name__ == '__main__':
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setup_logging()
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logging.info('starting ssl endpoint')
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client = Client(base_url='unix://var/run/docker.sock', version='1.15')
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# try to start in SSL mode, no problem if that fails
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logging.info('try in SSL mode')
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if not start_haproxy_ssl():
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logging.info('SSL mode failed')
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if not is_haproxy_running():
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# tried to start haproxy and this failed, so we need to create a certificate and try again:
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# - start non ssl haproxy to be able to get a valid cert
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logging.info('try in NON SSL mode')
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start_haproxy()
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# - get all domains
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resolved_domains = list_domains.get_resolving_domains_from_containers(client)
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# - create cert
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create_cert_data_standalone(resolved_domains)
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create_haproxy_cert()
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start_haproxy_ssl()
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# now we should have it up and running or something weird happened.
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if not is_haproxy_running():
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logging.error('could not start after generating cert. See output above.')
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sys.exit(1)
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t = threading.Thread(target=cert_watcher)
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t.start()
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for line in client.events():
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line_str = line.decode("utf-8")
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event = json.loads(line_str)
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if event['Action'] in ['start', 'stop']:
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# check if there is any domain name configured
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container_id = event['id']
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if len(list_domains.handle_container(client, container_id)) > 0:
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resolved_domains = list_domains.get_resolving_domains_from_containers(client)
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create_cert_data_standalone(resolved_domains)
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create_haproxy_cert()
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