/
fierce.py
executable file
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/
fierce.py
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#!/usr/bin/env python3
import argparse
import functools
import http.client
import ipaddress
import os
import random
import socket
import time
from multiprocessing import Process, Queue
import json
import dns.name
import dns.query
import dns.resolver
import dns.reversename
import dns.zone
def find_subdomain_list_file(filename):
# First check the list directory relative to where we are. This
# will typically happen if they simply cloned the Github repository
filename_path = os.path.join(os.path.dirname(__file__), "lists", filename)
if os.path.exists(filename_path):
return os.path.abspath(filename_path)
try:
import pkg_resources
except ImportError:
return filename
# If the relative check failed then attempt to find the list file
# in the pip package directory. This will typically happen on pip package
# installs (duh)
#
# Here's how pip itself handles this:
#
# https://github.com/pypa/pip/blob/master/pip/commands/show.py
#
try:
fierce = pkg_resources.get_distribution('fierce')
except pkg_resources.DistributionNotFound:
return filename
if isinstance(fierce, pkg_resources.Distribution):
paths = []
if fierce.has_metadata('RECORD'):
lines = fierce.get_metadata_lines('RECORD')
paths = [l.split(',')[0] for l in lines]
paths = [os.path.join(fierce.location, p) for p in paths]
elif fierce.has_metadata('installed-files.txt'):
lines = fierce.get_metadata_lines('installed-files.txt')
paths = [l for l in lines]
paths = [os.path.join(fierce.egg_info, p) for p in paths]
for p in paths:
if filename == os.path.basename(p):
return p
# If we couldn't find anything just return the original list file
return filename
def head_request(url):
conn = http.client.HTTPConnection(url, timeout=3)
try:
conn.request("HEAD", "/")
except socket.gaierror:
return []
except (ConnectionRefusedError, socket.error):
return []
else:
try:
resp = conn.getresponse()
except socket.timeout:
return []
finally:
conn.close()
resp_headers = resp.getheaders()
if resp_headers:
headers = {}
for header in resp_headers:
headers[header[0]] = header[1]
return headers
else:
return None
def concatenate_subdomains(domain, subdomains):
result = dns.name.Name(tuple(subdomains) + domain.labels)
if not result.is_absolute():
result = result.concatenate(dns.name.root)
return result
def query(resolver, domain, record_type='A'):
try:
resp = resolver.query(domain, record_type, raise_on_no_answer=False)
if resp.response.answer:
return resp
# If we don't receive an answer from our current resolver let's
# assume we received information on nameservers we can use and
# perform the same query with those nameservers
if resp.response.additional and resp.response.authority:
ns = [
rdata.address
for additionals in resp.response.additional
for rdata in additionals.items
]
resolver.nameservers = ns
return query(resolver, domain, record_type)
return None
except (dns.resolver.NXDOMAIN, dns.resolver.NoNameservers):
return None
def reverse_query(resolver, ip):
return query(resolver, dns.reversename.from_address(ip), record_type='PTR')
def zone_transfer(address, domain):
try:
return dns.zone.from_xfr(dns.query.xfr(address, domain))
except (ConnectionResetError, dns.exception.FormError):
return None
except (ConnectionRefusedError, dns.exception.FormError):
return None
def get_class_c_network(ip):
ip = int(ip)
floored = ipaddress.ip_address(ip - (ip % (2 ** 8)))
class_c = ipaddress.IPv4Network('{}/24'.format(floored))
return class_c
def traverse_expander(ip, n=5):
class_c = get_class_c_network(ip)
result = [ipaddress.IPv4Address(ip + i) for i in range(-n, n + 1)]
result = [i for i in result if i in class_c]
return result
def wide_expander(ip):
class_c = get_class_c_network(ip)
result = list(class_c)
return result
def search_filter(domains, address):
return any(domain in address for domain in domains)
def find_nearby(resolver, ips, filter_func=None):
reversed_ips = {str(i): reverse_query(resolver, str(i)) for i in ips}
reversed_ips = {k: v for k, v in reversed_ips.items() if v is not None}
if filter_func:
reversed_ips = {k: v for k, v in reversed_ips.items() if v and filter_func(v[0].to_text())}
if not reversed_ips:
return None
return {k: v[0].to_text() for k, v in reversed_ips.items() if v}
def fierce(**kwargs):
"""
fierce function is directly callable and returns a results dictionary
:param concurrency:
:param domain:
:param print:
:param connect:
:return: python dictionary of results
"""
resolver = dns.resolver.Resolver()
nameservers = []
if kwargs.get('dns_servers'):
nameservers = kwargs['dns_servers']
elif kwargs.get('dns_file'):
nameservers = [ns.strip() for ns in open(kwargs["dns_file"]).readlines()]
if nameservers:
resolver.nameservers = nameservers
reversed_ips = False
if kwargs.get("range"):
internal_range = ipaddress.IPv4Network(kwargs.get("range"))
reversed_ips = find_nearby(resolver, list(internal_range))
if not kwargs.get("concurrency"):
numWorkers = 1
else:
numWorkers = kwargs.get("concurrency")
if kwargs.get("domain"):
domain = dns.name.from_text(kwargs['domain'])
else:
return
if not domain.is_absolute():
domain = domain.concatenate(dns.name.root)
# DNS times out sometimes
domain_name_servers = []
for attempt in range(0, 5):
ns = query(resolver, domain, record_type='NS')
if ns is not None:
domain_name_servers = [n.to_text() for n in ns]
break
time.sleep(3)
soa = query(resolver, domain, record_type='SOA')
zone = {}
soa_mname = ''
if soa:
soa_mname = soa[0].mname
master = query(resolver, soa_mname, record_type='A')
if master:
master_address = master[0].address
zone_dump = zone_transfer(master_address, domain)
if zone_dump is not None:
zone = {(k.to_text() + '.' + domain.to_text()): v.to_text(k) for k, v in zone_dump.items()}
random_subdomain = str(random.randint(1e10, 1e11))
random_domain = concatenate_subdomains(domain, [random_subdomain])
wildcard = query(resolver, random_domain, record_type='A')
if kwargs.get('subdomains'):
subdomains = kwargs["subdomains"]
else:
if kwargs.get("subdomain_file"):
subdomain_file = kwargs.get("subdomain_file")
else:
subdomain_file = find_subdomain_list_file('default.txt')
subdomains = [sd.strip() for sd in open(subdomain_file).readlines()]
visited = set()
hosts = Queue()
def subdomainWorker(visited):
while True:
subdomain = subdomainQueue.get()
if type(subdomain) is int:
return
url = concatenate_subdomains(domain, [subdomain])
try:
record = query(resolver, url, record_type='A')
except dns.exception.Timeout:
return
if record is None:
continue
try:
ip = ipaddress.IPv4Address(record[0].address)
except TypeError:
return
headers = False
if kwargs.get('connect') and not ip.is_private:
headers = head_request(str(ip))
if kwargs.get("traverse"):
traverse = kwargs.get("traverse")
else:
traverse = 5
if kwargs.get("wide"):
ips = wide_expander(ip)
else:
ips = traverse_expander(ip, traverse)
filter_func = None
if kwargs.get("search"):
filter_func = functools.partial(search_filter, kwargs["search"])
ips = set(ips) - set(visited)
visited |= ips
hosts.put({
str(url): {
'ip': str(ip),
'headers': headers,
'nearby': find_nearby(resolver, ips, filter_func=filter_func)
}
})
if kwargs.get("delay"):
time.sleep(kwargs["delay"])
else:
time.sleep(0)
workers = []
subdomainQueue = Queue()
for i in range(numWorkers):
p = Process(target=subdomainWorker, args=(visited,))
workers.append(p)
p.start()
for subdomain in subdomains:
subdomainQueue.put(subdomain)
while True:
if subdomainQueue.empty():
for i in range(numWorkers):
# workers terminate when they encounter an int
subdomainQueue.put(50)
for worker in workers:
# blocks until process terminates
worker.join()
def get_hosts(q):
d = {}
while q.qsize() > 0:
for fqdn, nearby in q.get().items():
d[fqdn] = nearby
return d
results = {'target': domain.to_text(),
'hosts': get_hosts(hosts),
'nameservers': domain_name_servers,
'zone': zone if len(zone) > 0 else False,
'wildcard': bool(wildcard),
'range': reversed_ips
}
results['soa_mname'] = soa_mname.to_text() if soa_mname else ''
if kwargs.get('pretty_print'):
print(json.dumps(results, indent=4))
if kwargs.get('print'):
print(json.dumps(results))
return results
def parse_args():
p = argparse.ArgumentParser(description='''
A DNS reconnaissance tool for locating non-contiguous IP space.
''', formatter_class=argparse.RawTextHelpFormatter)
p.add_argument('--print', action='store_true',
help='print the results')
p.add_argument('--pretty-print', action='store_true', default=True,
help='print the results')
p.add_argument('--domain', action='store',
help='domain name to test')
p.add_argument('--concurrency', action='store', type=int,
help='number of cuncurrent processes')
p.add_argument('--connect', action='store_true',
help='attempt HTTP connection to non-RFC 1918 hosts')
p.add_argument('--wide', action='store_true',
help='scan entire class c of discovered records')
p.add_argument('--traverse', action='store', type=int, default=5,
help='scan IPs near discovered records, this won\'t enter adjacent class c\'s')
p.add_argument('--search', action='store', nargs='+',
help='filter on these domains when expanding lookup')
p.add_argument('--range', action='store',
help='scan an internal IP range, use cidr notation')
p.add_argument('--delay', action='store', type=float, default=None,
help='time to wait between lookups')
subdomain_group = p.add_mutually_exclusive_group()
subdomain_group.add_argument('--subdomains', action='store', nargs='+',
help='use these subdomains')
subdomain_group.add_argument('--subdomain_file', action='store',
default="default.txt",
help='use subdomains specified in this file (one per line)')
dns_group = p.add_mutually_exclusive_group()
dns_group.add_argument('--dns-servers', action='store', nargs='+',
help='use these dns servers for reverse lookups')
dns_group.add_argument('--dns-file', action='store',
help='use dns servers specified in this file for reverse lookups (one per line)')
args = p.parse_args()
# Attempt to intelligently find the subdomain list depending on
# how this library was installed.
if args.subdomain_file and not os.path.exists(args.subdomain_file):
args.subdomain_file = find_subdomain_list_file(args.subdomain_file)
return args
def main():
args = parse_args()
fierce(**vars(args))
if __name__ == "__main__":
main()