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import argparse

import collections

import concurrent.futures

import errno

import logging

import json

import random

import re

import socket

import ssl

import time

from http.client import HTTPConnection, HTTPSConnection, HTTPException

from urllib.parse import urlsplit

import jinja2

PARALLELISM = 16

USER_AGENT = "HTTPSWatch Bot (https://httpswatch.com)"

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

class Not200(Exception):

def __init__(self, status):

super(Exception, self).__init__()

self.status = status

def fetch_through_redirects(http, stop=None):

path = "/"

url = None

while True:

http.request("GET", path, headers={"User-Agent": USER_AGENT})

resp = http.getresponse()

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

url = urlsplit(resp.getheader("Location"))

if stop is not None and stop(url):

break

resp.read()

resp.close()

if url.netloc and url.netloc != http.host:

# Probably should actually handle this...

raise ValueError("Site redirects to a different domain.")

path = url.path

if not path.startswith("/"):

path = "/" + path

continue

if resp.status != 200:

raise Not200(resp.status)

break

return url, resp

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)

context.options |= ssl.OP_NO_SSLv2 | ssl.OP_NO_SSLv3

# 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

except OSError as e:

error_name = errno.errorcode[e.errno]

good_connection.fail("<code>connect()</code> returns with error {}.".format(error_name))

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:

def stop_on_http_or_domain_change(url):

return url.scheme == "http" or (url.netloc and url.netloc != domain)

final, resp = fetch_through_redirects(http, stop_on_http_or_domain_change)

if final is not None and final.scheme == "http":

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

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

except Not200 as e:

https_load.fail("The HTTPS site returns an error status ({}) on request.".format(e.status))

return

except OSError as e:

err_msg = errno.errorcode[e.errno]

https_load.fail("Encountered error ({}) while loading HTTPS site.".format(err_msg))

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:

def stop_on_https(url):

return url.scheme == "https"

final, resp = fetch_through_redirects(http, stop_on_https)

if final is not None and final.scheme == "https":

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

else:

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

mediocre = True

except HTTPException:

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

return

except Not200 as e:

http_redirect.fail("The HTTP site returns an error status ({}) on request.".format(e.status))

return

except OSError as e:

err_msg = errno.errorcode[e.errno]

http_redirect.fail("Encountered error ({}) while loading HTTP site.".format(err_msg))

return

finally:

http.close()

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

def check_sites(sites_file):

# Read list of sites.

with open(sites_file, 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

for f in futures:

# This will raise an exception if check_one_site did.

f.result()

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():

parser = argparse.ArgumentParser()

parser.add_argument("--cached", action="store_true")

parser.add_argument("sites", default="sites.json", nargs="?")

args = parser.parse_args()

if args.cached:

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

data = json.load(fp)

else:

data = check_sites(args.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()

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