查找恶意的TOR中继节点
众所周知,TOR是一种能够保护世界各地不同中继节点之间通信调度数据包的“软件”,由志愿者建立的网络进行运营。在过去的几年中,TOR已经被物理和网络***者广泛用于掩盖恶意操作。TOR也被视为最主要的进入暗网的方法,在暗网中,“恶意”的人可以通过黑市非法买卖东西。
网络里每个中继节点都能够根据自己的配置状态,决定是作为一个ExitPoint(在以下图片中用最后一台接触“Bob”的机器表示)或者只是一个中继节点(在下图中,TOR节点用“绿十字”突出显示)。如果中继节点决定成为一个ExitNode,就会向公众公开自己的IP地址,这通常是一个引起当地警方警觉的好办法。
过去一年中,电视节目,广播电台,youtube频道,Facebook这一类大众媒体披露出,许多黑市故意将人们引向DarkWeb,从而将他们暴露在许多新的***场景下。事实上新的***者会为了监视他们的通信流而设置退出节点或继电器节点。这种***可能会在许多单一的方式下发生,但最常用的今天写的这三个:
1.DNS中毒:这个技术主要在于将与知名网站有关的DNS调用重定向到一个假的页面上, 这个假的页面包含开发工具包,可以使用户的浏览器妥协。
2.文件修补:这个技术是改变请求的文件,在其到达目的地之前在其中添加恶意内容.这些步骤会在发给原始请求者之前直接在ExitPoint /中继节点上进行。
3.替换证明(SSL – MITM):这个技术是用假的证书替换网站真实的证书,这样就可以解密通信流,拦截凭证和参数。
致力于网络安全就意味着要及时意识到这样的***的存在,也要能够决定将在何时通过TOR中继节点。请注意,TOR不是DarkWeb中唯一的匿名网络.
我的目标是弄清楚我的TOR流通过恶意中继节点的时间。出于这样一个原因,我决定写一个能够对DNS Poison,文件修补和SSL-MITM做出一些快速检查的python脚本。这个脚本已经存在了2年, 直到现在仍是保密状态。自从科学研究应用了我的FindMalExit.py的高级版本之后,我决定公开这个脚本。
想法
实际上这是一个非常简单的想法:“让我们在不通过TOR网络(或通过可靠电路)的情况下拿到证书,IP地址和文件,然后重复这个过程,直到通过所有可用的中继节点。比较结果并进行检查。”
实现
以下请查收我的代码。请记住这是一个不是最终的代码 (这段代码只是一个更大的项目中的第一个版本,现在由Yoroi维护)。我决定发布HTML格式的代码。
#!/usr/bin/env python2
#========================================================================#
# THIS IS NOT A PRODUCTION RELEASED SOFTWARE #
#========================================================================#
# Purpose of finMaliciousRelayPoints is to proof the way it's possible to#
# discover TOR malicious Relays Points. Please do not use it in #
# any production environment #
# Author: Marco Ramilli #
# eMail: XXXXXXXX #
# WebSite: marcoramilli.blogspot.com #
# Use it at your own #
#========================================================================#
#==============================Disclaimer: ==============================#
#THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR #
#IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED #
#WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE #
#DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, #
#INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES #
#(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR #
#SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) #
#HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, #
#STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING #
#IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE #
#POSSIBILITY OF SUCH DAMAGE. #
#========================================================================#
#-------------------------------------------------------------------------
#------------------- GENERAL SECTION -------------------------------------
#-------------------------------------------------------------------------
import StringIO
import tempfile
import time
import hashlib
import traceback
from geoip import geolite2
import stem.control
TRUSTED_HOP_FINGERPRINT = '379FB450010D17078B3766C2273303C358C3A442'
#trusted hop
SOCKS_PORT = 9050
CONNECTION_TIMEOUT = 30 # timeout before we give up on a circuit
#-------------------------------------------------------------------------
#---------------- File Patching Section ----------------------------------
#-------------------------------------------------------------------------
import pycurl
check_files = {
"http://live.sysinternals.com/psexec.exe",
"http://live.sysinternals.com/psexec.exe",
"http://live.sysinternals.com/psping.exe", }
check_files_patch_results = []
class File_Check_Results:
"""
Analysis Results against File Patching
"""
def __init__(self, url, filen, filepath, exitnode, found_hash):
self.url = url
self.filename = filen
self.filepath = filepath
self.exitnode = exitnode
self.filehash = found_hash
#------------------------------------------------------------------------
#------------------- DNS Poison Section ---------------------------------
#------------------------------------------------------------------------
import dns.resolver
import socks
import socket
check_domain_poison_results = []
domains = {
"www.youporn.com",
"youporn.com",
"www.torproject.org",
"www.wikileaks.org",
"www.i2p2.de",
"torrentfreak.com",
"blockchain.info",
}
class Domain_Poison_Check:
"""
Analysis Results against Domain Poison
"""
def __init__(self, domain):
self.domain = domain
self.address = []
self.path = []
def pushAddr(self, add):
self.address.append(add)
def pushPath(self, path):
self.path = path
#-----------------------------------------------------------------------
#------------------- SSL Sltrip Section --------------------------------
#-----------------------------------------------------------------------
import OpenSSL
import ssl
check_ssl_strip_results = []
ssl_strip_monitored_urls = {
"www.google.com",
"www.microsoft.com",
"www.apple.com",
"www.bbc.com",
}
class SSL_Strip_Check:
"""
Analysis Result against SSL Strip
"""
def __init__(self, domain, public_key, serial_number):
self.domain = domain
self.public_key = public_key
self.serial_number = serial_number
#----------------------------------------------------------------------
#---------------- Starting Coding -------------------------------
#----------------------------------------------------------------------
def sslCheckOriginal():
"""
Download the original Certificate without TOR connection
"""
print('[+] Populating SSL for later check')
for url in ssl_strip_monitored_urls:
try:
cert = ssl.get_server_certificate((str(url), 443))
x509 = OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM, cert)
p_k = x509.get_pubkey()
s_n = x509.get_serial_number()
print('[+] Acquired Certificate: %s' % url)
print(' |_________> serial_number %s' % s_n)
print(' |_________> public_key %s' % p_k)
check_ssl_strip_results.append(SSL_Strip_Check(url, p_k, s_n))
except Exception as err:
print('[-] Error While Acquiring certificats on setup phase !')
traceback.print_exc()
return time.time()
def fileCheckOriginal():
"""
Downloading file ORIGINAL without TOR
"""
print('[+] Populating File Hasing for later check')
for url in check_files:
try:
data = query(url)
file_name = url.split("/")[-1]
_,tmp_file = tempfile.mkstemp(prefix="exitmap_%s_" % file_name)
with open(tmp_file, "wb") as fd:
fd.write(data)
print('[+] Saving File \"%s\".' % tmp_file)
check_files_patch_results.append( File_Check_Results(url, file_name, tmp_file, "NO", sha512_file(tmp_file)) )
print('[+] First Time we see the file..')
print(' |_________> exitnode : None' )
print(' |_________> :url: %s' % str(url) )
print(' |_________> :filePath: %s' % str(tmp_file))
print(' |_________> :file Hash: %s' % str(sha512_file(tmp_file)))
except Exception as err:
print('[-] Error ! %s' % err)
traceback.print_exc()
pass
return time.time()
def resolveOriginalDomains():
"""
Resolving DNS For original purposes
"""
print('[+] Populating Domain Name Resolution for later check ')
try:
for domain in domains:
response = dns.resolver.query(domain)
d = Domain_Poison_Check(domain)
print('[+] Domain: %s' % domain)
for record in response:
print(' |____> maps to %s.' % (record.address))
d.pushAddr(record)
check_domain_poison_results.append(d)
return time.time()
except Exception as err:
print('[+] Exception: %s' % err)
traceback.print_exc()
return time.time()
def query(url):
"""
Uses pycurl to fetch a site using the proxy on the SOCKS_PORT.
"""
output = StringIO.StringIO()
query = pycurl.Curl()
query.setopt(pycurl.URL, url)
query.setopt(pycurl.PROXY, 'localhost')
query.setopt(pycurl.PROXYPORT, SOCKS_PORT)
query.setopt(pycurl.PROXYTYPE, pycurl.PROXYTYPE_SOCKS5_HOSTNAME)
query.setopt(pycurl.CONNECTTIMEOUT, CONNECTION_TIMEOUT)
query.setopt(pycurl.WRITEFUNCTION, output.write)
try:
query.perform()
return output.getvalue()
except pycurl.error as exc:
raise ValueError("Unable to reach %s (%s)" % (url, exc))
def scan(controller, path):
"""
Scan Tor Relays Point to find File Patching
"""
def attach_stream(stream):
if stream.status == 'NEW':
try:
controller.attach_stream(stream.id, circuit_id)
#print('[+] New Circuit id (%s) attached and ready to be used!' % circuit_id)
except Exception as err:
controller.remove_event_listener(attach_stream)
controller.reset_conf('__LeaveStreamsUnattached')
try:
print('[+] Creating a New TOR circuit based on path: %s' % path)
circuit_id = controller.new_circuit(path, await_build = True)
controller.add_event_listener(attach_stream, stem.control.EventType.STREAM)
controller.set_conf('__LeaveStreamsUnattached', '1') # leave stream management to us
start_time = time.time()
socks.setdefaultproxy(socks.PROXY_TYPE_SOCKS5, "127.0.0.1", 9050)
socket.socket = socks.socket
ip = query('http://ip.42.pl/raw')
if ip is not None:
country = geolite2.lookup( str(ip) ).country
print('\n \n')
print('[+] Performing FilePatch, DNS Spoofing and Certificate Checking\
passing through --> %s (%s) \n \n' % (str(ip), str(country)) )
time_FileCheck = fileCheck(path)
print('[+] FileCheck took: %0.2f seconds' % ( time_FileCheck - start_time))
#time_CertsCheck = certsCheck(path)
#print('[+] CertsCheck took: %0.2f seconds' % ( time_DNSCheck - start_time))
time_DNSCheck = dnsCheck(path)
print('[+] DNSCheck took: %0.2f seconds' % ( time_DNSCheck - start_time))
except Exception as err:
print('[-] Circuit creation error: %s' % path)
return time.time() - start_time
def certsCheck(path):
"""
SSL Strip detection
TODO: It's still a weak control. Need to collect and to compare public_key()
"""
print('[+] Checking Certificates')
try:
socks.setdefaultproxy(socks.PROXY_TYPE_SOCKS5, "127.0.0.1", 9050)
socket.socket = socks.socket
for url in ssl_strip_monitored_urls:
cert = ssl.get_server_certificate((str(url), 443))
x509 = OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM, cert)
p_k = x509.get_pubkey()
s_n = x509.get_serial_number()
for stored_cert in check_ssl_strip_results:
if str(url) == str(stored_cert.domain):
if str(stored_cert.serial_number) != str(s_n):
print('[+] ALERT Found SSL Strip on uri (%s) through path %s ' % (url, path))
break
else:
print('[+] Certificate Check seems to be OK for %s' % url)
except Exception as err:
print('[-] Error: %s' % err)
traceback.print_exc()
socket.close()
return time.time()
def dnsCheck(path):
"""
DNS Poisoning Check
"""
try:
socks.setdefaultproxy(socks.PROXY_TYPE_SOCKS5, "127.0.0.1", 9050)
socket.socket = socks.socket
print('[+] Checking DNS ')
for domain in domains:
ipv4 = socket.gethostbyname(domain)
for p_d in check_domain_poison_results:
if str(p_d.domain) == str(domain):
found = False
for d_ip in p_d.address:
if str(ipv4) == str(d_ip):
found = True
break
if found == False:
print('[+] ALERT:DNS SPOOFING FOUND: name: %s ip: %s (path: %s )' % (domain, ipv4, path) )
else:
print('[+] Check DNS (%s) seems to be OK' % domain)
except Exception as err:
print('[-] Error: %s' % err)
traceback.print_exc()
socket.close()
return time.time()
def fileCheck(path):
"""
Downloading file through TOR circuits doing the hashing
"""
print('[+] Checking For File patching ')
for url in check_files:
try:
#File Rereive
data = query(url)
file_name = url.split("/")[-1]
_,tmp_file = tempfile.mkstemp(prefix="exitmap_%s_" % file_name)
with open(tmp_file, "wb") as fd:
fd.write(data)
for i in check_files_patch_results:
if str(i.url) == str(url):
if str(i.filehash) != str(sha512_file(tmp_file)):
print('[+] ALERT File Patch FOUND !')
print(' | exitnode : %s' % str(i.exitnode) )
print(' |_________> url: %s' % str(i.url) )
print(' |_________> filePath: %s' % str(i.filepath) )
print(' |_________> fileHash: %s' % str(i.filehash) )
#check_files_patch_results.append( File_Check_Results(url, file_name, tmp_file, path, sha512_file(tmp_file)) )
else :
print('[+] File (%s) seems to be ok' % i.url)
break
except Exception as err:
print('[-] Error ! %s' % err)
traceback.print_exc()
pass
return time.time()
def sha512_file(file_name):
"""
Calculate SHA512 over the given file.
"""
hash_func = hashlib.sha256()
with open(file_name, "rb") as fd:
hash_func.update(fd.read())
return hash_func.hexdigest()
if __name__ == '__main__':
start_analysis = time.time()
print("""
|=====================================================================|
| Find Malicious Relay Nodes is a python script made for checking 3 |
| unique kind of frauds such as: |
| (1) File Patching |
| (2) DNS Poison |
| (3) SSL Stripping (MITM SSL) |
|=====================================================================|
""")
print("""
|=====================================================================|
| Initialization Phase |
|=====================================================================|
""")
dns_setup_time = resolveOriginalDomains()
print('[+] DNS Setup Finished: %0.2f' % (dns_setup_time - start_analysis))
file_check_original_time = fileCheckOriginal()
print('[+] File Setup Finished: %0.2f' % (file_check_original_time - start_analysis))
ssl_checking_original_time = sslCheckOriginal()
print('[+] Acquiring Certificates Setup Finished: %0.2f' % (ssl_checking_original_time - start_analysis))
print("""
|=====================================================================|
| Analysis Phase |
|=====================================================================|
""")
print('[+] Connecting and Fetching possible Relays ...')
with stem.control.Controller.from_port() as controller:
controller.authenticate()
net_status = controller.get_network_statuses()
for descriptor in net_status:
try:
fingerprint = descriptor.fingerprint
print('[+] Selecting a New Exit Point:')
print('[+] |_________> FingerPrint: %s ' % fingerprint)
print('[+] |_________> Flags: %s ' % descriptor.flags)
print('[+] |_________> Exit_Policies: %s ' % descriptor.exit_policy)
if 'EXIT' in (flag.upper() for flag in descriptor.flags):
print('[+] Found Exit Point. Performing Scan through EXIT: %s' % fingerprint)
if None == descriptor.exit_policy:
print('[+] No Exit Policies found ... no certs checking')
time_taken = scan(controller, [TRUSTED_HOP_FINGERPRINT, fingerprint])
else:
#print('[+] Not Exit Point found. Using it as Relay passing to TRUST Exit Point')
pass
#time_taken = scan(controller, [fingerprint, TRUSTED_HOP_FINGERPRINT])
#print('[+] Finished Analysis for %s finished => %0.2f seconds' % (fingerprint, time_taken))
except Exception as exc:
print('[-] Exception on FingerPrint: %s => %s' % (fingerprint, exc))
traceback.print_exc()
pass
转载于:https://blog.51cto.com/cxnic/1727685