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#!/usr/bin/env python3
import re
import sys
import configparser
import urllib.request
SCRIPT_NAME = 'check-ca-crt.py'
USAGE = '''Check that the stored provider CA matches the one announced online.
Usage: {name} <provider> <config>
Example: {name} riseup branding/config/vendor.conf'''.format(name=SCRIPT_NAME)
def getLocalCert(provider):
sanitized = re.sub(r'[^\w\s-]', '', provider).strip().lower()
with open('branding/config/'
'{provider}-ca.crt'.format(provider=sanitized)) 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']
if __name__ == '__main__':
if len(sys.argv) != 3:
print('[!] Not enough arguments')
print(USAGE)
sys.exit(1)
provider = sys.argv[1]
config = sys.argv[2]
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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