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mitmproxy/examples/contrib/block_dns_over_https.py
Maximilian Hils c69239bb90 switch to stdlib logging 
mitmproxy previously used a homegrown logging mechanism based around
`mitmproxy.ctx.log` and the `add_log` hook. This worked well for everything
we control, but does not work outside the mitmproxy universe.
For now we have simply ignored logging in e.g. tornado or h2, but with the
upcoming introduction of mitmproxy_wireguard we now have a dependency
on some Rust/PyO3 code for which we definitely want logs, but which also
cannot easily be changed to use our homegrown logging (PyO3 does the heavy
lifting to add interoperability with stdlib logging). Long story short,
we want to introduce a log handler for stdlib logging.

Now there are two ways how such a handler could operate:

 1. We could build a handler that forwards all stdlib log events
    into our homegrown mechanism.
 2. We embrace stdlib's logging as the correct way to do things,
    and get rid of our homegrown stuff.

This PR follows the second approach by removing the `add_log` hook and
rewriting the `TermLog` and `EventStore` addons to listen for stdlib log records.
This means that all `mitmproxy.ctx.log.info` events are now simply `logging.info` etc.

One upside of this approach is that many parts of the codebase now don't depend
on the existence of `mitmproxy.ctx` and we can use off-the-shelf things like pytest's
`caplog`. We can also now better colorize log output and/or add timestamps.
2022-09-17 17:28:35 +02:00

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"""
This module is for blocking DNS over HTTPS requests.
It loads a blocklist of IPs and hostnames that are known to serve DNS over HTTPS requests.
It also uses headers, query params, and paths to detect DoH (and block it)
"""
import logging
# known DoH providers' hostnames and IP addresses to block
default_blocklist: dict = {
"hostnames": [
"dns.adguard.com", "dns-family.adguard.com", "dns.google", "cloudflare-dns.com",
"mozilla.cloudflare-dns.com", "security.cloudflare-dns.com", "family.cloudflare-dns.com",
"dns.quad9.net", "dns9.quad9.net", "dns10.quad9.net", "dns11.quad9.net", "doh.opendns.com",
"doh.familyshield.opendns.com", "doh.cleanbrowsing.org", "doh.xfinity.com", "dohdot.coxlab.net",
"odvr.nic.cz", "doh.dnslify.com", "dns.nextdns.io", "dns.dnsoverhttps.net", "doh.crypto.sx",
"doh.powerdns.org", "doh-fi.blahdns.com", "doh-jp.blahdns.com", "doh-de.blahdns.com",
"doh.ffmuc.net", "dns.dns-over-https.com", "doh.securedns.eu", "dns.rubyfish.cn",
"dns.containerpi.com", "dns.containerpi.com", "dns.containerpi.com", "doh-2.seby.io",
"doh.seby.io", "commons.host", "doh.dnswarden.com", "doh.dnswarden.com", "doh.dnswarden.com",
"dns-nyc.aaflalo.me", "dns.aaflalo.me", "doh.applied-privacy.net", "doh.captnemo.in",
"doh.tiar.app", "doh.tiarap.org", "doh.dns.sb", "rdns.faelix.net", "doh.li", "doh.armadillodns.net",
"jp.tiar.app", "jp.tiarap.org", "doh.42l.fr", "dns.hostux.net", "dns.hostux.net", "dns.aa.net.uk",
"adblock.mydns.network", "ibksturm.synology.me", "jcdns.fun", "ibuki.cgnat.net", "dns.twnic.tw",
"example.doh.blockerdns.com", "dns.digitale-gesellschaft.ch", "doh.libredns.gr",
"doh.centraleu.pi-dns.com", "doh.northeu.pi-dns.com", "doh.westus.pi-dns.com",
"doh.eastus.pi-dns.com", "dns.flatuslifir.is", "private.canadianshield.cira.ca",
"protected.canadianshield.cira.ca", "family.canadianshield.cira.ca", "dns.google.com",
"dns.google.com"
],
"ips": [
"104.16.248.249", "104.16.248.249", "104.16.249.249", "104.16.249.249", "104.18.2.55",
"104.18.26.128", "104.18.27.128", "104.18.3.55", "104.18.44.204", "104.18.44.204",
"104.18.45.204", "104.18.45.204", "104.182.57.196", "104.236.178.232", "104.24.122.53",
"104.24.123.53", "104.28.0.106", "104.28.1.106", "104.31.90.138", "104.31.91.138",
"115.159.131.230", "116.202.176.26", "116.203.115.192", "136.144.215.158", "139.59.48.222",
"139.99.222.72", "146.112.41.2", "146.112.41.3", "146.185.167.43", "149.112.112.10",
"149.112.112.11", "149.112.112.112", "149.112.112.9", "149.112.121.10", "149.112.121.20",
"149.112.121.30", "149.112.122.10", "149.112.122.20", "149.112.122.30", "159.69.198.101",
"168.235.81.167", "172.104.93.80", "172.65.3.223", "174.138.29.175", "174.68.248.77",
"176.103.130.130", "176.103.130.131", "176.103.130.132", "176.103.130.134", "176.56.236.175",
"178.62.214.105", "185.134.196.54", "185.134.197.54", "185.213.26.187", "185.216.27.142",
"185.228.168.10", "185.228.168.168", "185.235.81.1", "185.26.126.37", "185.26.126.37",
"185.43.135.1", "185.95.218.42", "185.95.218.43", "195.30.94.28", "2001:148f:fffe::1",
"2001:19f0:7001:3259:5400:2ff:fe71:bc9", "2001:19f0:7001:5554:5400:2ff:fe57:3077",
"2001:19f0:7001:5554:5400:2ff:fe57:3077", "2001:19f0:7001:5554:5400:2ff:fe57:3077",
"2001:4860:4860::8844", "2001:4860:4860::8888",
"2001:4b98:dc2:43:216:3eff:fe86:1d28", "2001:558:fe21:6b:96:113:151:149",
"2001:608:a01::3", "2001:678:888:69:c45d:2738:c3f2:1878", "2001:8b0::2022", "2001:8b0::2023",
"2001:c50:ffff:1:101:101:101:101", "210.17.9.228", "217.169.20.22", "217.169.20.23",
"2400:6180:0:d0::5f73:4001", "2400:8902::f03c:91ff:feda:c514", "2604:180:f3::42",
"2604:a880:1:20::51:f001", "2606:4700::6810:f8f9", "2606:4700::6810:f9f9", "2606:4700::6812:1a80",
"2606:4700::6812:1b80", "2606:4700::6812:237", "2606:4700::6812:337", "2606:4700:3033::6812:2ccc",
"2606:4700:3033::6812:2dcc", "2606:4700:3033::6818:7b35", "2606:4700:3034::681c:16a",
"2606:4700:3035::6818:7a35", "2606:4700:3035::681f:5a8a", "2606:4700:3036::681c:6a",
"2606:4700:3036::681f:5b8a", "2606:4700:60:0:a71e:6467:cef8:2a56", "2620:10a:80bb::10",
"2620:10a:80bb::20", "2620:10a:80bb::30" "2620:10a:80bc::10", "2620:10a:80bc::20",
"2620:10a:80bc::30", "2620:119:fc::2", "2620:119:fc::3", "2620:fe::10", "2620:fe::11",
"2620:fe::9", "2620:fe::fe:10", "2620:fe::fe:11", "2620:fe::fe:9", "2620:fe::fe",
"2a00:5a60::ad1:ff", "2a00:5a60::ad2:ff", "2a00:5a60::bad1:ff", "2a00:5a60::bad2:ff",
"2a00:d880:5:bf0::7c93", "2a01:4f8:1c0c:8233::1", "2a01:4f8:1c1c:6b4b::1", "2a01:4f8:c2c:52bf::1",
"2a01:4f9:c010:43ce::1", "2a01:4f9:c01f:4::abcd", "2a01:7c8:d002:1ef:5054:ff:fe40:3703",
"2a01:9e00::54", "2a01:9e00::55", "2a01:9e01::54", "2a01:9e01::55",
"2a02:1205:34d5:5070:b26e:bfff:fe1d:e19b", "2a03:4000:38:53c::2",
"2a03:b0c0:0:1010::e9a:3001", "2a04:bdc7:100:70::abcd", "2a05:fc84::42", "2a05:fc84::43",
"2a07:a8c0::", "2a0d:4d00:81::1", "2a0d:5600:33:3::abcd", "35.198.2.76", "35.231.247.227",
"45.32.55.94", "45.67.219.208", "45.76.113.31", "45.77.180.10", "45.90.28.0",
"46.101.66.244", "46.227.200.54", "46.227.200.55", "46.239.223.80", "8.8.4.4",
"8.8.8.8", "83.77.85.7", "88.198.91.187", "9.9.9.10", "9.9.9.11", "9.9.9.9",
"94.130.106.88", "95.216.181.228", "95.216.212.177", "96.113.151.148",
]
}
# additional hostnames to block
additional_doh_names: list[str] = [
'dns.google.com'
]
# additional IPs to block
additional_doh_ips: list[str] = [
]
doh_hostnames, doh_ips = default_blocklist['hostnames'], default_blocklist['ips']
# convert to sets for faster lookups
doh_hostnames = set(doh_hostnames)
doh_ips = set(doh_ips)
def _has_dns_message_content_type(flow):
"""
Check if HTTP request has a DNS-looking 'Content-Type' header
:param flow: mitmproxy flow
:return: True if 'Content-Type' header is DNS-looking, False otherwise
"""
doh_content_types = ['application/dns-message']
if 'Content-Type' in flow.request.headers:
if flow.request.headers['Content-Type'] in doh_content_types:
return True
return False
def _request_has_dns_query_string(flow):
"""
Check if the query string of a request contains the parameter 'dns'
:param flow: mitmproxy flow
:return: True is 'dns' is a parameter in the query string, False otherwise
"""
return 'dns' in flow.request.query
def _request_is_dns_json(flow):
"""
Check if the request looks like DoH with JSON.
The only known implementations of DoH with JSON are Cloudflare and Google.
For more info, see:
- https://developers.cloudflare.com/1.1.1.1/dns-over-https/json-format/
- https://developers.google.com/speed/public-dns/docs/doh/json
:param flow: mitmproxy flow
:return: True is request looks like DNS JSON, False otherwise
"""
# Header 'Accept: application/dns-json' is required in Cloudflare's DoH JSON API
# or they return a 400 HTTP response code
if 'Accept' in flow.request.headers:
if flow.request.headers['Accept'] == 'application/dns-json':
return True
# Google's DoH JSON API is https://dns.google/resolve
path = flow.request.path.split('?')[0]
if flow.request.host == 'dns.google' and path == '/resolve':
return True
return False
def _request_has_doh_looking_path(flow):
"""
Check if the path looks like it's DoH.
Most common one is '/dns-query', likely because that's what's in the RFC
:param flow: mitmproxy flow
:return: True if path looks like it's DoH, otherwise False
"""
doh_paths = [
'/dns-query', # used in example in RFC 8484 (see https://tools.ietf.org/html/rfc8484#section-4.1.1)
]
path = flow.request.path.split('?')[0]
return path in doh_paths
def _requested_hostname_is_in_doh_blocklist(flow):
"""
Check if server hostname is in our DoH provider blocklist.
The current blocklist is taken from https://github.com/curl/curl/wiki/DNS-over-HTTPS.
:param flow: mitmproxy flow
:return: True if server's hostname is in DoH blocklist, otherwise False
"""
hostname = flow.request.host
ip = flow.server_conn.address
return hostname in doh_hostnames or hostname in doh_ips or ip in doh_ips
doh_request_detection_checks = [
_has_dns_message_content_type,
_request_has_dns_query_string,
_request_is_dns_json,
_requested_hostname_is_in_doh_blocklist,
_request_has_doh_looking_path
]
def request(flow):
for check in doh_request_detection_checks:
is_doh = check(flow)
if is_doh:
logging.warning("[DoH Detection] DNS over HTTPS request detected via method \"%s\"" % check.__name__)
flow.kill()
break
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