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check_https.py

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import collections

import concurrent.futures

import logging

import json

import random

import re

import socket

import ssl

import sys

import time

from http.client import HTTPConnection, HTTPSConnection, HTTPException

import jinja2

PARALLELISM = 8

log = logging.getLogger("check_https")

class Check:

def __init__(self):

pass

def succeed(self, desc):

self.failed = False

self.icon = "good"

self.description = desc

def fail(self, desc):

self.failed = True

self.icon = "bad"

self.description = desc

def check_one_site(site):

domain = site["domain"]

log.info("Checking {}".format(domain))

site["status"] = "bad"

site["checks"] = checks = []

good_connection = Check()

checks.append(good_connection)

try:

addrs = socket.getaddrinfo(domain, 443, socket.AF_INET, proto=socket.IPPROTO_TCP)

except socket.gaierror:

log.warning("DNS lookup for {} failed!".format(domain))

return

info = random.choice(addrs)

sock = socket.socket(info[0], info[1], info[2])

sock.settimeout(10)

context = ssl.SSLContext(ssl.PROTOCOL_SSLv23)

# Some platforms (OS X) do not have OP_NO_COMPRESSION

if hasattr(ssl, "OP_NO_COMPRESSION"):

context.options |= ssl.OP_NO_COMPRESSION

context.verify_mode = ssl.CERT_REQUIRED

context.check_hostname = True

context.load_verify_locations("moz-certs.pem")

secure_sock = context.wrap_socket(sock, server_hostname=domain)

try:

secure_sock.connect(info[4])

except ConnectionRefusedError:

good_connection.fail("Nothing is listening on port 443.")

return

except socket.timeout:

good_connection.fail("<code>connect()</code> to port 443 times out.")

return

except ssl.SSLError as e:

if e.reason == "CERTIFICATE_VERIFY_FAILED":

desc = "Certificate not trusted by Mozilla cert store."

else:

desc = "A TLS-related error ({}) occurs when trying to connect.".format(e.reason)

good_connection.fail(desc)

return

except ssl.CertificateError:

good_connection.fail("Certificate hostname verification fails.")

return

good_connection.succeed("A verified TLS connection can be established. "

"(<a href=\"https://www.ssllabs.com/ssltest/analyze.html?d={}\">SSL Labs report</a>)".format(domain))

mediocre = False

https_load = Check()

checks.append(https_load)

http = HTTPSConnection(domain, context=context)

http.sock = secure_sock

try:

http.request("GET", "/")

resp = http.getresponse()

if resp.status in (301, 302, 303, 307):

redirect_to_http = resp.getheader("Location").startswith("http://")

if redirect_to_http:

https_load.fail("The HTTPS site redirects to HTTP.")

return

elif resp.status != 200:

https_load.fail("The HTTPS site returns an error code on request.")

return

good_sts = Check()

checks.append(good_sts)

sts = resp.getheader("Strict-Transport-Security")

if sts is not None:

m = re.search("max-age=(\d+)", sts)

if m is not None:

age = int(m.group(1))

if age >= 2592000:

good_sts.succeed("<code>Strict-Transport-Security</code> header is set with a long <code>max-age</code> directive.")

else:

good_sts.fail("<code>Strict-Transport-Security</code> header is set but the <code>max-age</code> is less than 30 days.")

else:

good_sts.fail("<code>Strict-Transport-Security</code> header doesn't contain a <code>max-age</code> directive.")

else:

good_sts.fail("<code>Strict-Transport-Security</code> header is not set.")

if good_sts.failed:

mediocre = True

except socket.timeout:

https_load.fail("Requesting HTTPS page times out.")

return

finally:

http.close()

https_load.succeed("A page can be successfully fetched over HTTPS.")

http_redirect = Check()

checks.append(http_redirect)

http = HTTPConnection(domain)

try:

url = "/"

# Follow all redirects.

while True:

http.request("GET", url)

resp = http.getresponse()

if resp.status in (301, 302, 303, 307):

url = resp.getheader("Location")

resp.close()

if url.startswith("https://"):

http_redirect.succeed("HTTP site redirects to HTTPS.")

break

else:

http_redirect.fail("HTTP site doesn't redirect to HTTPS.")

mediocre = True

break

except HTTPException:

http_redirect.fail("Encountered HTTP error while loading HTTP site.")

finally:

http.close()

site["status"] = "mediocre" if mediocre else "good"

def check_sites():

# Read list of sites.

with open("sites.json", encoding="utf-8") as fp:

data = json.load(fp)

futures = []

executor = concurrent.futures.ThreadPoolExecutor(max_workers=PARALLELISM)

with executor:

for cat in data["categories"]:

for site in cat["sites"]:

futures.append(executor.submit(check_one_site, site))

while True:

done, not_done = concurrent.futures.wait(futures, timeout=1)

print("{}/{}".format(len(done), len(done) + len(not_done)))

if not not_done:

break

total_status = collections.Counter()

for cat in data["categories"]:

cat_status = collections.Counter()

for site in cat["sites"]:

cat_status[site["status"]] += 1

cat["counts"] = cat_status

total_status.update(cat_status)

data["counts"] = total_status

return data

def encode_check(o):

if not isinstance(o, Check):

raise TypeError

return o.__dict__

def main():

if "--cached" in sys.argv:

with open("cache.json", "r", encoding="utf-8") as fp:

data = json.load(fp)

else:

data = check_sites()

with open("cache.json", "w", encoding="utf-8") as fp:

json.dump(data, fp, default=encode_check)

# Write out results.

env = jinja2.Environment()

with open("index.html.jinja", encoding="utf-8") as fp:

tmp = env.from_string(fp.read())

update_time = time.strftime("%Y-%m-%d %H:%MZ", time.gmtime())

with open("index.html", "w", encoding="utf-8") as fp:

fp.write(tmp.render(data=data, update_time=update_time))

if __name__ == "__main__":

main()