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#!/usr/bin/env python3
import os
import re
import sys
import configparser
import urllib.request
SCRIPT_NAME = 'check-ca-crt'
VENDOR_PATH = None
USAGE = '''Check that the stored provider CA matches the one announced online.
Usage: {name} <provider>
Example: {name} riseup'''.format(name=SCRIPT_NAME)
def getLocalCert(provider):
with open(os.path.join(VENDOR_PATH, provider,
'{provider}-ca.crt'.format(provider=sanitize(provider).lower()))) as crt:
return crt.read().strip()
def getRemoteCert(uri):
print("... checking cert from", uri)
fp = urllib.request.urlopen(uri)
remote_cert = fp.read().decode('utf-8').strip()
fp.close()
return remote_cert
def getUriForProvider(provider, configfile):
c = configparser.ConfigParser()
c.read(configfile)
return c[provider]['caURL']
def sanitize(s):
return re.sub(r'[^\w\s-]', '', s).strip()
if __name__ == '__main__':
VENDOR_PATH = os.environ.get('VENDOR_PATH')
if not VENDOR_PATH:
print('[!] ERROR: Please set VENDOR_PATH variable first')
sys.exit(1)
if not os.path.isdir(os.path.abspath(VENDOR_PATH)):
print('[!] ERROR: VENDOR_PATH points to non-existent dir')
sys.exit(1)
if len(sys.argv) != 2:
print('[!] Not enough arguments')
print(USAGE)
sys.exit(1)
provider = sys.argv[1]
config = os.path.abspath(os.path.join(VENDOR_PATH, 'vendor.conf'))
if not os.path.isfile(config):
print('[!] ERROR: cannot open {config}')
sys.exit(1)
try:
uri = getUriForProvider(provider, config)
except IndexError:
print('[!] Misconfigured provider')
sys.exit(1)
local = getLocalCert(provider)
remote = getRemoteCert(uri)
try:
assert local == remote
except AssertionError:
print('[!] ERROR: remote and local CA certs do not match')
sys.exit(1)
else:
print('OK: local CA matches what provider announces')
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