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Merge pull request 'add validate-my-dns.py to check dns' (#2736) from lare/registry:master into master
Reviewed-on: https://git.dn42.dev/dn42/registry/pulls/2736 Reviewed-by: schema-checker <schema-checker@noreply.dn42.us>
This commit is contained in:
Simon Marsh
commit
00d74d9776
1 changed files with 759 additions and 0 deletions
759
validate-my-dns.py
Executable file
759
validate-my-dns.py
Executable file
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@ -0,0 +1,759 @@
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#!/usr/bin/env python3
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# NOTE: for configuration see below imports
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import time
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import json
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import subprocess
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import os
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import sys
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import struct
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import base64
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import hashlib
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import threading
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from multiprocessing.dummy import Pool as ThreadPool
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try:
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import dns.name
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import dns.query
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import dns.dnssec
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import dns.message
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import dns.resolver
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import dns.rdatatype
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import dns.rcode
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except ImportError:
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print()
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print("CRITICAL: this script requires the 'dnspython' library, please install it using `python3 -m pip install dnspython`")
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print()
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exit(1)
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# import exceptions so they could be try/catched
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import binascii
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import dns.exception
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# --- start configuration
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# path to the registry repo
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REGISTRY_PATH = "."
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# amounts of seconds to wait for a reply
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TIMEOUT = 3
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# amount of threads to use when scanning dns servers
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THREADS = 16
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# --- end configuration
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# counter of errors that occured
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errors = 0
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# global summary object (used for final summary): {"domain": [success, dnssec-fail, wrong NS, wrong SOA, NX-DOMAIN, refused, timeout]}
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summary = {}
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# indexes for the summary list
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class SUMMARY:
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SUCCESS = 0
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DNSSEC_FAIL = 1
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WRONG_NS = 2
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WRONG_SOA = 3
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NXDOMAIN = 4
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REFUSED = 5
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SERVFAIL = 6
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TIMEOUT = 7
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# step1:
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def get_domain_by_mntner(mntner):
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"""get a list of domains (and reverse ipv4/6) if a nserver is specified"""
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global errors
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# grep for the given mntner in the dns,inetnum,inet6num directory of the registry and split it into a list; replace // with / in case REGISTRY_PATH ends with /
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dns_files = subprocess.Popen(["grep", "-Ril", f" {mntner}", f"{REGISTRY_PATH}/data/dns/"],
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stdout=subprocess.PIPE).communicate()[0].decode().replace("//", "/").split("\n")[:-1]
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inetnums_files = subprocess.Popen(["grep", "-Ril", f" {mntner}", f"{REGISTRY_PATH}/data/inetnum/"],
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stdout=subprocess.PIPE).communicate()[0].decode().replace("//", "/").split("\n")[:-1]
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inet6nums_files = subprocess.Popen(
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["grep", "-Ril", f" {mntner}", f"{REGISTRY_PATH}/data/inet6num/"], stdout=subprocess.PIPE).communicate()[0].decode().split("\n")[:-1]
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# domains dict containing dns objects and inet(6)nums if they have nserver specified
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domains = {}
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def _parse_nserver(line):
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global errors
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nserver = line[20:].split(" ")
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# handle edge case where
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if "\t" in nserver[0]:
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print(
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f"WARN: nserver line is not following expected schema. atempting to guess: {line}")
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errors += 1
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nserver = nserver[0].split("\t")
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# has more than one space between nserver fqdn and its ip
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if len(nserver) > 2:
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print(
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f"WARN: nserver line is not following expected schema. atempting to guess: {line}")
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errors += 1
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nserver = [nserver[0], line[20:].replace(nserver[0], "").strip()]
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# ignore registry-sync nservers
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if "registry-sync.dn42" in nserver[0]:
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# TODO: parse registry-sync ips
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nserver = nserver[0]
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if nserver.endswith("ipv4.registry-sync.dn42"):
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nserver = [nserver, ".".join(nserver.replace(
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".ipv4.registry-sync.dn42", "").split(".")[::-1])]
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elif nserver.endswith("ipv6.registry-sync.dn42"):
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_ip6 = nserver.replace(
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".ipv6.registry-sync.dn42", "").replace(".", "")[::-1]
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nserver = [nserver, ":".join(
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a+b+c+d for a, b, c, d in zip(_ip6[::4], _ip6[1::4], _ip6[2::4], _ip6[3::4]))]
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return nserver
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# nserver should be defined in an other dns file
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if len(nserver) == 1:
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return [nserver[0], None]
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# nserver is defined in this file
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elif len(nserver) == 2:
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return nserver
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# read dns files
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for domain in dns_files:
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with open(domain) as d:
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domain_name = domain.split("/")[-1]
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# a dictionary for each domain with "nserver": {"ns1.domain.dn42": ["ns1 ipv4", "ns1 ipv6"], ...}, "ds-rdata": ["123 45 67 ...", "98 7 65 ..."]
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domains[domain_name] = {"nserver": {}, "ds-rdata": []}
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for line in d.readlines():
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line = line.replace("\n", "")
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if line.startswith("nserver"):
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_tmp = _parse_nserver(line)
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if _tmp == "break":
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break
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if _tmp[1] == None:
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domains[domain_name]["nserver"][_tmp[0]] = None
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elif _tmp[0] in domains[domain_name]["nserver"]:
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domains[domain_name]["nserver"][_tmp[0]].append(
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_tmp[1])
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else:
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domains[domain_name]["nserver"][_tmp[0]] = [_tmp[1]]
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elif line.startswith("ds-rdata:"):
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ds_rdata = line[20:].lower()
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_split = ds_rdata.split(" ")
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if len(_split) == 5:
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ds_rdata = f"{_split[0]} {_split[1]} {_split[2]} {_split[3] + _split[4]}"
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domains[domain_name]["ds-rdata"].append(ds_rdata)
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# load inetnums
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for inetnum in inetnums_files:
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# temp variables in case there is no nserver
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_nserver = {}
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_ds_rdatas = []
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_domain_name = ""
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with open(inetnum) as i4:
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for line in i4.readlines():
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line = line.replace("\n", "")
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if line.startswith("cidr"):
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line = line[20:]
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_domain_name = ".".join(
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line.split(".")[::-1]) + ".in-addr.arpa"
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if int(line.split("/")[1]) == 24:
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_domain_name = _domain_name.replace("0/24.", "")
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elif int(line.split("/")[1]) == 16:
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_domain_name = _domain_name.replace("0/16.0.", "")
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elif int(line.split("/")[1]) == 8:
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_domain_name = _domain_name.replace("0/8.0.0.", "")
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elif int(line.split("/")[1]) <= 24:
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# TODO: implement creation of multiple zones for every /24 within
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print(
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f"WARN: currently only ipv4 subnets with length >=24 or 16 or 8 are possible to be checked: relavent inetnum {line}")
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break
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elif line.startswith("nserver"):
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_tmp = _parse_nserver(line)
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if _tmp == "break":
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break
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if _tmp[0] in _nserver:
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print(
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f"ERROR: nserver {_tmp[0]} was specified twice (or more) in {inetnum.split('/')[-1]} without ip")
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errors += 1
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else:
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_nserver[_tmp[0]] = None
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elif line.startswith("ds-rdata:"):
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ds_rdata = line[20:].lower()
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_split = ds_rdata.split(" ")
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if len(_split) == 5:
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ds_rdata = f"{_split[0]} {_split[1]} {_split[2]} {_split[3] + _split[4]}"
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_ds_rdatas.append(ds_rdata)
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# if nserver list is not empty add the reverse to the domain list
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if not _nserver == {}:
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domains[_domain_name] = {
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"nserver": _nserver, "ds-rdata": _ds_rdatas}
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# load inet6nums
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for inet6num in inet6nums_files:
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# temp variables in case there is no nserver
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_nserver = {}
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_ds_rdatas = []
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_domain_name = ""
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with open(inet6num) as i6:
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for line in i6.readlines():
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line = line.replace("\n", "")
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if line.startswith("inet6num"):
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line = line[20:]
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# generate the reverse ipv6
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_domain_name = "ip6.arpa"
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_lowest, _highest = line.replace(":", "").split(" - ")
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for _digit1, _digit2 in zip(_lowest, _highest):
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if _digit1 != _digit2:
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break
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_domain_name = _digit1 + "." + _domain_name
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elif line.startswith("nserver"):
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_tmp = _parse_nserver(line)
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if _tmp == "break":
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break
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if _tmp[0] in _nserver:
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print(
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f"ERROR: nserver {_tmp[0]} was specified twice (or more) in {inet6num.split('/')[-1]} without ip")
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errors += 1
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else:
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_nserver[_tmp[0]] = None
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elif line.startswith("ds-rdata:"):
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ds_rdata = line[20:].lower()
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_split = ds_rdata.split(" ")
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if len(_split) == 5:
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ds_rdata = f"{_split[0]} {_split[1]} {_split[2]} {_split[3] + _split[4]}"
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_ds_rdatas.append(ds_rdata)
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# if nserver list is not empty add the reverse to the domain list
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if not _nserver == {}:
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domains[_domain_name] = {
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"nserver": _nserver, "ds-rdata": _ds_rdatas}
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# add entries from main domain, if the nserver doesn't have an ip address (like in inet(6)nums)
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for domain in domains:
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for nserver in domains[domain]["nserver"]:
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# if the nserver isn't specified: ...
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if domains[domain]["nserver"][nserver] == None:
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# print(f"INFO: the nserver {nserver} isn't specified in {domain}, looking into the parent domain of it")
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for i in range(len(nserver.split(".")), 1, -1):
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# check if the nserver is already in loaded database, starts with more specific
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if ".".join(nserver.split(".")[-i:]) in domains:
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try:
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domains[domain]["nserver"][nserver] = domains[".".join(
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nserver.split(".")[-i:])]["nserver"][nserver]
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except KeyError:
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# reaches here if the domain for the nserver specified in the inet{6}num/domain is found, but the nserver itself not.
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print(
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f"Warn: the nserver {nserver} specified in {domain} wasn't found")
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break
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return domains
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def get_soa(domain_name, nserver):
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"""query dns server for SOA"""
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global errors, summary
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try:
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request = dns.message.make_query(
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domain_name, dns.rdatatype.SOA, want_dnssec=False)
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response = dns.query.udp_with_fallback(
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request, nserver, timeout=TIMEOUT)
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except dns.exception.Timeout:
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print(f"WARN: querying {nserver} for SOA on {domain_name} timed out")
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summary[domain_name][SUMMARY.TIMEOUT] += 1
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errors += 1
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return False
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except dns.query.UnexpectedSource as e:
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print(
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f"ERROR: server replied with different ip than requested: error: {e}")
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errors += 1
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summary[domain_name][SUMMARY.SERVFAIL] += 1
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return False
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except Exception as e:
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print(
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f"ERROR: unknown error occured while querying {nserver} for {domain_name}: '{e}'")
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errors += 1
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time.sleep(3)
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return False
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# raise e
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if response[0].rcode() != 0:
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# HANDLE QUERY FAILED (SERVER ERROR OR NO SOA RECORD)
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print(
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f"WARN: query for a SOA on {domain_name} failed on {nserver}, returncode: {dns.rcode.to_text(response[0].rcode())}")
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errors += 1
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if dns.rcode.to_text(response[0].rcode()) == "REFUSED":
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summary[domain_name][SUMMARY.REFUSED] += 1
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errors += 1
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elif dns.rcode.to_text(response[0].rcode()) == "NXDOMAIN":
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summary[domain_name][SUMMARY.NXDOMAIN] += 1
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errors += 1
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elif dns.rcode.to_text(response[0].rcode()) == "SERVFAIL":
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summary[domain_name][SUMMARY.SERVFAIL] += 1
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errors += 1
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else:
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print(
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f"DEBUG: rcode not iplemented '{dns.rcode.to_text(response[0].rcode())}'")
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errors += 1
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return False
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_out = []
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for dnskey in response[0].answer:
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for key in dnskey.to_text().split("\n"):
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if not "IN SOA " in key:
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print(f"ERROR: CNAME returned for SOA: THIS SHOULD NOT BE USED")
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summary[domain_name][SUMMARY.WRONG_NS] += 1
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errors += 1
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break
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else:
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_out.append(key.split("IN SOA ")[1])
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# print(f"DEBUG: response: {response[0].answer[0].to_text()}")
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# print(f"DEBUG:{_out}")
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return _out
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def get_ns(domain_name, nserver):
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"""query dns server for NS"""
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global errors, summary
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try:
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request = dns.message.make_query(
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domain_name, dns.rdatatype.NS, want_dnssec=False)
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response = dns.query.udp_with_fallback(
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request, nserver, timeout=TIMEOUT)
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except dns.exception.Timeout:
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print(f"WARN: querying {nserver} for NS on {domain_name} timed out")
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summary[domain_name][SUMMARY.TIMEOUT] += 1
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errors += 1
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return False
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except dns.query.UnexpectedSource as e:
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print(
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f"ERROR: server replied with different different ip than requested: error: {e}")
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errors += 1
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return False
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if response[0].rcode() != 0:
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# HANDLE QUERY FAILED (SERVER ERROR OR NO NS RECORD)
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print(
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f"WARN: query for a NS on {domain_name} failed on {nserver}, returncode: {dns.rcode.to_text(response[0].rcode())}")
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errors += 1
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if dns.rcode.to_text(response[0].rcode()) == "REFUSED":
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summary[domain_name][SUMMARY.REFUSED] += 1
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errors += 1
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elif dns.rcode.to_text(response[0].rcode()) == "NXDOMAIN":
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summary[domain_name][SUMMARY.NXDOMAIN] += 1
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errors += 1
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else:
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print(
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f"DEBUG: rcode not iplemented '{dns.rcode.to_text(response[0].rcode())}'")
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return False
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_out = []
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for dnskey in response[0].answer:
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for key in dnskey.to_text().split("\n"):
|
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if not "IN NS " in key:
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print(f"ERROR: CNAME returned for NS: THIS SHOULD NOT BE USED")
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summary[domain_name][SUMMARY.WRONG_NS] += 1
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errors += 1
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||||
break
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else:
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_out.append(key.split("IN NS ")[1])
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# print(f"DEBUG: response: {response[0].answer[0].to_text()}")
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# print(f"DEBUG:{_out}")
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return _out
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||||
|
||||
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def get_dnskey(domain_name, nserver):
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"""query dns server for DNSKEY"""
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global errors, summary
|
||||
if nserver == None:
|
||||
print("WARN: nserver specified was 'None'")
|
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errors += 1
|
||||
return False
|
||||
try:
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request = dns.message.make_query(
|
||||
domain_name, dns.rdatatype.DNSKEY, want_dnssec=False)
|
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response = dns.query.udp_with_fallback(
|
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request, nserver, timeout=TIMEOUT)
|
||||
except dns.exception.Timeout:
|
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print(
|
||||
f"WARN: querying {nserver} for DNSKEY on {domain_name} timed out")
|
||||
summary[domain_name][SUMMARY.TIMEOUT] += 1
|
||||
errors += 1
|
||||
return False
|
||||
except dns.query.UnexpectedSource as e:
|
||||
print(
|
||||
f"ERROR: server replied with different different ip than requested: error: {e}")
|
||||
errors += 1
|
||||
return False
|
||||
except ConnectionRefusedError:
|
||||
print(
|
||||
f"WARN: {nserver} refused the connection")
|
||||
summary[domain_name][SUMMARY.REFUSED] += 1
|
||||
errors += 1
|
||||
return False
|
||||
|
||||
if response[0].rcode() != 0:
|
||||
# HANDLE QUERY FAILED (SERVER ERROR OR NO DNSKEY RECORD)
|
||||
print(
|
||||
f"WARN: query for a DNSKEY on {domain_name} failed on {nserver}, returncode: {dns.rcode.to_text(response[0].rcode())}")
|
||||
errors += 1
|
||||
if dns.rcode.to_text(response[0].rcode()) == "REFUSED":
|
||||
summary[domain_name][SUMMARY.REFUSED] += 1
|
||||
elif dns.rcode.to_text(response[0].rcode()) == "NXDOMAIN":
|
||||
summary[domain_name][SUMMARY.NXDOMAIN] += 1
|
||||
else:
|
||||
print(
|
||||
f"DEBUG: rcode not iplemented '{dns.rcode.to_text(response[0].rcode())}'")
|
||||
return False
|
||||
|
||||
_out = []
|
||||
for dnskey in response[0].answer:
|
||||
for key in dnskey.to_text().split("\n"):
|
||||
_out.append(key.split("IN DNSKEY ")[1])
|
||||
|
||||
# print(f"DEBUG: response: {response[0].answer[0].to_text()}")
|
||||
# print(f"DEBUG:{_out}")
|
||||
return _out
|
||||
|
||||
# end_step1
|
||||
|
||||
|
||||
# step 2: <start dnskey_to_DS.py based on https://gist.github.com/wido/4c6288b2f5ba6d16fce37dca3fc2cb4a >
|
||||
"""
|
||||
Generate a DNSSEC DS record based on the incoming DNSKEY record
|
||||
The DNSKEY can be found using for example 'dig':
|
||||
$ dig DNSKEY secure.widodh.nl
|
||||
The output can then be parsed with the following code to generate a DS record
|
||||
for in the parent DNS zone
|
||||
Author: Wido den Hollander <wido@widodh.nl>
|
||||
Many thanks to this blogpost: https://www.v13.gr/blog/?p=239
|
||||
"""
|
||||
|
||||
|
||||
def _calc_keyid(flags, protocol, algorithm, dnskey):
|
||||
st = struct.pack('!HBB', int(flags), int(protocol), int(algorithm))
|
||||
st += base64.b64decode(dnskey)
|
||||
|
||||
cnt = 0
|
||||
for idx in range(len(st)):
|
||||
s = struct.unpack('B', st[idx:idx+1])[0]
|
||||
if (idx % 2) == 0:
|
||||
cnt += s << 8
|
||||
else:
|
||||
cnt += s
|
||||
|
||||
return ((cnt & 0xFFFF) + (cnt >> 16)) & 0xFFFF
|
||||
|
||||
|
||||
def _calc_ds(domain, flags, protocol, algorithm, dnskey):
|
||||
if domain.endswith('.') is False:
|
||||
domain += '.'
|
||||
|
||||
signature = bytes()
|
||||
for i in domain.split('.'):
|
||||
signature += struct.pack('B', len(i)) + i.encode()
|
||||
|
||||
signature += struct.pack('!HBB', int(flags), int(protocol), int(algorithm))
|
||||
signature += base64.b64decode(dnskey)
|
||||
|
||||
return {
|
||||
'sha1': hashlib.sha1(signature).hexdigest().upper(),
|
||||
'sha256': hashlib.sha256(signature).hexdigest().upper(),
|
||||
}
|
||||
|
||||
|
||||
def dnskey_to_ds(domain, dnskey):
|
||||
dnskeylist = dnskey.split(' ', 3)
|
||||
|
||||
flags = dnskeylist[0]
|
||||
protocol = dnskeylist[1]
|
||||
algorithm = dnskeylist[2]
|
||||
key = dnskeylist[3].replace(' ', '')
|
||||
|
||||
keyid = _calc_keyid(flags, protocol, algorithm, key)
|
||||
ds = _calc_ds(domain, flags, protocol, algorithm, key)
|
||||
|
||||
ret = list()
|
||||
ret.append(str(keyid) + ' ' + str(algorithm) + ' ' + str(1) + ' '
|
||||
+ ds['sha1'].lower())
|
||||
ret.append(str(keyid) + ' ' + str(algorithm) + ' ' + str(2) + ' '
|
||||
+ ds['sha256'].lower())
|
||||
return ret
|
||||
|
||||
# step2: <end dnskey_to_DS.py>
|
||||
|
||||
# step3: start: partially stolen from: https://stackoverflow.com/questions/26137036/programmatically-check-if-domains-are-dnssec-protected
|
||||
|
||||
|
||||
def check_dnssec(domain_name, domain_data):
|
||||
global errors, summary
|
||||
success = False
|
||||
|
||||
no_ds_rdatas = domain_data["ds-rdata"] == []
|
||||
# if no_ds_rdatas:
|
||||
# print(
|
||||
# f"NOTE: {domain_name} doesn't have ds-rdata configured, not checking it")
|
||||
# return True
|
||||
|
||||
for nserver in domain_data["nserver"]:
|
||||
|
||||
# if the nserver is not set (i.e. not loaded from other dns file or "wrong" fqdn)
|
||||
if domain_data["nserver"][nserver] == None:
|
||||
print(
|
||||
f"INFO: ip address(es) for nserver '{nserver}' in '{domain_name}' isn't specified/loaded")
|
||||
continue
|
||||
for nsaddr in domain_data["nserver"][nserver]:
|
||||
|
||||
# get SOA
|
||||
request = dns.message.make_query(
|
||||
domain_name, dns.rdatatype.SOA, want_dnssec=False)
|
||||
try:
|
||||
# send the query
|
||||
dns.query.udp_with_fallback(request, nsaddr, timeout=TIMEOUT)
|
||||
# if it timed out: tell the user
|
||||
except dns.exception.Timeout:
|
||||
print(
|
||||
f"WARN: querying {nserver} ({nsaddr}) for {domain_name} timed out")
|
||||
summary[domain_name][SUMMARY.TIMEOUT] += 1
|
||||
continue
|
||||
|
||||
if no_ds_rdatas:
|
||||
print(
|
||||
f"INFO: query for {domain_name} SOA on {nserver} ({nsaddr}) succeded, not checking DNSSEC")
|
||||
continue
|
||||
# get DNSKEY for zone
|
||||
request = dns.message.make_query(
|
||||
domain_name, dns.rdatatype.DNSKEY, want_dnssec=True)
|
||||
response = dns.query.udp_with_fallback(
|
||||
request, nsaddr, timeout=TIMEOUT)
|
||||
|
||||
if response[0].rcode() != 0:
|
||||
# HANDLE QUERY FAILED (SERVER ERROR OR NO DNSKEY RECORD)
|
||||
print(
|
||||
f"WARN: query for a DNSKEY on {domain_name} failed on {nserver} ({nsaddr}), returncode: {response[0].rcode()}")
|
||||
errors += 1
|
||||
continue
|
||||
# answer should contain two RRSET: DNSKEY and RRSIG(DNSKEY)
|
||||
answer = response[0].answer
|
||||
if len(answer) != 2:
|
||||
# SOMETHING WENT WRONG
|
||||
print(
|
||||
f"ERROR: query for a DNSKEY on {domain_name} failed on {nserver} ({nsaddr}), invalid answer length: {len(answer)}")
|
||||
errors += 1
|
||||
continue
|
||||
# the DNSKEY should be self signed, validate it
|
||||
name = dns.name.from_text(domain_name)
|
||||
try:
|
||||
# print(f"DEBUG: answer[0]: {answer[0]}")
|
||||
# print(f"DEBUG: answer[1]: {answer[1]}")
|
||||
try:
|
||||
dns.dnssec.validate(
|
||||
answer[0], answer[1], {name: answer[0]})
|
||||
# it raises an AttributeError if the records are in the wrong order
|
||||
except AttributeError as e:
|
||||
dns.dnssec.validate(
|
||||
answer[1], answer[0], {name: answer[0]})
|
||||
|
||||
except dns.dnssec.ValidationFailure:
|
||||
# BE SUSPICIOUS
|
||||
print(
|
||||
f"WARN: DNSSEC validation failed on {domain_name} failed on {nserver} ({nsaddr}), answer: {answer}")
|
||||
summary[domain_name][SUMMARY.DNSSEC_FAIL] += 1
|
||||
errors += 1
|
||||
except AttributeError as e:
|
||||
print(f"ERROR: {e}")
|
||||
errors += 1
|
||||
else:
|
||||
# WE'RE GOOD, THERE'S A VALID DNSSEC SELF-SIGNED KEY FOR example.com
|
||||
print(
|
||||
f"INFO: DNSSEC validation succeded on {domain_name} failed on {nserver} ({nsaddr})")
|
||||
summary[domain_name][SUMMARY.SUCCESS] += 1
|
||||
success = True
|
||||
|
||||
return success
|
||||
|
||||
|
||||
# step3: end
|
||||
|
||||
|
||||
def main(mntner):
|
||||
global errors
|
||||
global summary
|
||||
# get all domains/inet(6)nums of the mntner
|
||||
domains = get_domain_by_mntner(mntner=mntner)
|
||||
|
||||
# global _tmp_continue, _tmp_found
|
||||
# _tmp_found = False
|
||||
# _tmp_continue = "10.in-addr.arpa"
|
||||
def threaded_check_dns(domain_name):
|
||||
global errors, summary
|
||||
# global _tmp_found, _tmp_continue
|
||||
# if domain_name == _tmp_continue:
|
||||
# _tmp_found = True
|
||||
# if not _tmp_found:
|
||||
# return
|
||||
summary[domain_name] = [0, 0, 0, 0, 0, 0, 0, 0]
|
||||
# check if the domain doesn't have DS data
|
||||
if domains[domain_name]["ds-rdata"] == []:
|
||||
print(f"NOTE: {domain_name} doesn't have any ds-rdata specified")
|
||||
# continue
|
||||
|
||||
for nserver in domains[domain_name]["nserver"]:
|
||||
# check for unset nserver ips -> dont check them
|
||||
if domains[domain_name]["nserver"][nserver] == None:
|
||||
continue
|
||||
for ip in domains[domain_name]["nserver"][nserver]:
|
||||
if ip == "":
|
||||
print(
|
||||
f"ERROR: nserver value for {nserver} is empty. Maybe the line ends with space?")
|
||||
errors += 1
|
||||
continue
|
||||
_soa = get_soa(domain_name, ip)
|
||||
if _soa == False:
|
||||
continue
|
||||
# print(f"DEBUG: response {_soa}")
|
||||
if _soa == []:
|
||||
print(
|
||||
f"ERROR: empty SOA record for {domain_name} returned by {ip}({nserver})")
|
||||
errors += 1
|
||||
summary[domain_name][SUMMARY.WRONG_SOA] += 1
|
||||
continue
|
||||
soa = _soa[0].split(" ")
|
||||
# check if Serial, TTL, etc. are numbers:
|
||||
try:
|
||||
int(soa[2]) + int(soa[3]) + \
|
||||
int(soa[4]) + int(soa[5]) + int(soa[6])
|
||||
except ValueError:
|
||||
print(
|
||||
f"ERROR: invalid SOA record from {ip} ({nserver}) for {domain_name}")
|
||||
summary[domain_name][SUMMARY.WRONG_SOA] += 1
|
||||
errors += 1
|
||||
continue
|
||||
|
||||
master_ns, _e_mail, _serial, _, _, _, _ = soa
|
||||
_found = False
|
||||
for _nserver in domains[domain_name]["nserver"]:
|
||||
#
|
||||
if master_ns == f"{_nserver}.":
|
||||
_found = True
|
||||
break
|
||||
else:
|
||||
print(
|
||||
f"WARN: master nserver '{master_ns}' returned by {ip}({nserver}) not in the list of the specified nservers of {domain_name}")
|
||||
summary[domain_name][SUMMARY.WRONG_SOA] += 1
|
||||
errors += 1
|
||||
continue
|
||||
|
||||
_ns = get_ns(domain_name, ip)
|
||||
if _ns == False:
|
||||
continue
|
||||
# print(f"DEBUG: response {_ns}")
|
||||
if not f"{nserver}." in _ns:
|
||||
print(
|
||||
f"WARN: returned nservers returned by {ip}({nserver}) for {domain_name} does not include it self")
|
||||
summary[domain_name][SUMMARY.WRONG_NS] += 1
|
||||
errors += 1
|
||||
continue
|
||||
|
||||
for _nserver in domains[domain_name]["nserver"]:
|
||||
for _server in _ns:
|
||||
if f"{_nserver}." == _server:
|
||||
# remove matches
|
||||
_ns.remove(_server)
|
||||
break
|
||||
else:
|
||||
print(
|
||||
f"INFO: {_nserver} was not listed in the NS records by {ip}({nserver}) for {domain_name}")
|
||||
summary[domain_name][SUMMARY.WRONG_NS] += 1
|
||||
# check if there are any left
|
||||
if len(_ns) > 0:
|
||||
for _server in _ns:
|
||||
print(
|
||||
f"INFO: {_server} in response for NS records by {ip}({nserver}) for {domain_name} but not in the dns/inet(6)num file")
|
||||
summary[domain_name][SUMMARY.WRONG_NS] += 1
|
||||
|
||||
# don't check dnssec if not configured
|
||||
if domains[domain_name]["ds-rdata"] == []:
|
||||
summary[domain_name][SUMMARY.SUCCESS] += 1
|
||||
continue
|
||||
|
||||
ds_candidates = []
|
||||
# load DNSKEYs from nserver: if False something failed (i.e. timeout)
|
||||
_keys = get_dnskey(domain_name, ip)
|
||||
if _keys == False:
|
||||
continue
|
||||
# convert all found keys to DS
|
||||
for key in _keys:
|
||||
try:
|
||||
_ds_s = dnskey_to_ds(domain_name, key)
|
||||
except binascii.Error as e:
|
||||
print(
|
||||
f"ERROR: trying to convert '{key}' to DS failed: {e}")
|
||||
summary[domain_name][SUMMARY.DNSSEC_FAIL] += 1
|
||||
continue
|
||||
ds_candidates.extend(_ds_s)
|
||||
found = False
|
||||
# iterate over DS-rdata from the registry and check if they are found on the nserver
|
||||
for ds in domains[domain_name]["ds-rdata"]:
|
||||
# print(ds)
|
||||
if ds in ds_candidates:
|
||||
found = True
|
||||
# print(f"DEBUG: available: {domains[domain_name]['ds-rdata']}")
|
||||
# print(f"DEBUG: generated: {ds_candidates}")
|
||||
if found:
|
||||
print(
|
||||
f"INFO: correct ds-rdata specified and matching DNSKEY returned by {ip} for {domain_name}")
|
||||
summary[domain_name][SUMMARY.SUCCESS] += 1
|
||||
else:
|
||||
print(
|
||||
f"ERROR: invalid ds-rdata specified or non-matching DNSKEY returned by {ip} for {domain_name}")
|
||||
summary[domain_name][SUMMARY.DNSSEC_FAIL] += 1
|
||||
errors += 1
|
||||
# break
|
||||
|
||||
# create ThreadPool and run threaded_check_dns against all domains
|
||||
pool = ThreadPool(processes=THREADS)
|
||||
results = pool.map(threaded_check_dns, domains)
|
||||
pool.close()
|
||||
pool.join()
|
||||
|
||||
# --- show a summary as a table ---
|
||||
|
||||
# sort summary
|
||||
_summary = {}
|
||||
for domain in domains:
|
||||
_summary[domain] = summary[domain]
|
||||
|
||||
summary = _summary
|
||||
|
||||
# get length of longest domain name
|
||||
_max_domain_length = 9
|
||||
for _domain in summary:
|
||||
if len(_domain) > _max_domain_length:
|
||||
_max_domain_length = len(_domain)
|
||||
|
||||
print("\n\nSummary:\n")
|
||||
print(f"{'domain name'.ljust(_max_domain_length)} | success | dnssec fail | wrong NS | wrong SOA | NXDOMAIN | REFUSED | SERVFAIL | timeout")
|
||||
print(f"-{'-'.rjust(_max_domain_length, '-') }-|---------|-------------|----------|-----------|----------|---------| -------- | -------")
|
||||
for domain in summary:
|
||||
print(f" {domain.rjust(1).ljust(_max_domain_length)} | {str(summary[domain][SUMMARY.SUCCESS]).rjust(7)} | {str(summary[domain][SUMMARY.DNSSEC_FAIL]).rjust(11)} | {str(summary[domain][SUMMARY.WRONG_NS]).rjust(8)} | {str(summary[domain][SUMMARY.WRONG_SOA]).rjust(9)} | {str(summary[domain][SUMMARY.NXDOMAIN]).rjust(8)} | {str(summary[domain][SUMMARY.REFUSED]).rjust(7)} | {str(summary[domain][SUMMARY.SERVFAIL]).rjust(8)} | {str(summary[domain][SUMMARY.TIMEOUT]).rjust(7)}")
|
||||
|
||||
# print(summary)
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
if len(sys.argv) == 1:
|
||||
print("please specify your mntner")
|
||||
print(f' `{sys.argv[0]} YOU-MNT` to scan your dns and inet(6)num zones')
|
||||
print(f' `{sys.argv[0]} ""` to scan everything (takes a long time)')
|
||||
exit(1)
|
||||
main(sys.argv[1])
|
||||
exit(errors)
|
||||
|
||||
|
||||
# commands to run:
|
||||
# 1. drill -D <domain>.dn42 @ns1.<domain>.dn42 NS
|
||||
# 2. dnskey_to_ds("<domain>.dn42"
|
||||
# #<TTL> IN DNSKEY
|
||||
# "257 3 13 <base64 ...>")
|
||||
# 3. write dnskey to "trust-anchor"
|
||||
# 4.delv @ns1.<domain.dn42 +root=<domain>.dn42 -a ./trust-anchor.tmp SOA <domain>.dn42
|
||||
Loading…
Add table
Reference in a new issue