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#!/usr/bin/env python
# Signed Certificate Timestamp TLS extension verifier
# Copyright (c) 2015 Pier Carlo Chiodi - http://www.pierky.com
#
# https://github.com/pierky/sct-verify
import sys
import subprocess
import base64
import struct
# from monitor_conf import ctlogs
OPENSSL_PATH="/usr/local/ssl/bin/openssl"
LOGS = [
{ "Name": "Aviator",
"Key": "-----BEGIN PUBLIC KEY-----\n"
"MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE1/TMabLkDpCjiupacAlP7xNi0I1J\n"
"YP8bQFAHDG1xhtolSY1l4QgNRzRrvSe8liE+NPWHdjGxfx3JhTsN9x8/6Q==\n"
"-----END PUBLIC KEY-----",
"LogID": "aPaY+B9kgr46jO65KB1M/HFRXWeT1ETRCmesu09P+8Q=" },
{ "Name": "Digicert Log",
"Key": "-----BEGIN PUBLIC KEY-----\n"
"MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEAkbFvhu7gkAW6MHSrBlpE1n4+HCF\n"
"RkC5OLAjgqhkTH+/uzSfSl8ois8ZxAD2NgaTZe1M9akhYlrYkes4JECs6A==\n"
"-----END PUBLIC KEY-----",
"LogID": "VhQGmi/XwuzT9eG9RLI+x0Z2ubyZEVzA75SYVdaJ0N0=" },
{ "Name": "Pilot",
"Key": "-----BEGIN PUBLIC KEY-----\n"
"MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEfahLEimAoz2t01p3uMziiLOl/fHT\n"
"DM0YDOhBRuiBARsV4UvxG2LdNgoIGLrtCzWE0J5APC2em4JlvR8EEEFMoA==\n"
"-----END PUBLIC KEY-----",
"LogID": "pLkJkLQYWBSHuxOizGdwCjw1mAT5G9+443fNDsgN3BA=" },
{ "Name": "Rocketeer",
"Key": "-----BEGIN PUBLIC KEY-----\n"
"MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEIFsYyDzBi7MxCAC/oJBXK7dHjG+1\n"
"aLCOkHjpoHPqTyghLpzA9BYbqvnV16mAw04vUjyYASVGJCUoI3ctBcJAeg==\n"
"-----END PUBLIC KEY-----",
"LogID": "7ku9t3XOYLrhQmkfq+GeZqMPfl+wctiDAMR7iXqo/cs=" },
{ "Name": "Izenpe",
"Key": "-----BEGIN PUBLIC KEY-----\n"
"MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEJ2Q5DC3cUBj4IQCiDu0s6j51up+T\n"
"ZAkAEcQRF6tczw90rLWXkJMAW7jr9yc92bIKgV8vDXU4lDeZHvYHduDuvg==\n"
"-----END PUBLIC KEY-----",
"LogID": "dGG0oJz7PUHXUVlXWy52SaRFqNJ3CbDMVkpkgrfrQaM=" },
{ "Name": "Certly",
"Key": "-----BEGIN PUBLIC KEY-----\n"
"MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAECyPLhWKYYUgEc+tUXfPQB4wtGS2M\n"
"NvXrjwFCCnyYJifBtd2Sk7Cu+Js9DNhMTh35FftHaHu6ZrclnNBKwmbbSA==\n"
"-----END PUBLIC KEY-----",
"LogID": "zbUXm3/BwEb+6jETaj+PAC5hgvr4iW/syLL1tatgSQA=" }
]
if len( sys.argv ) <= 1:
print( "Missing hostname argument." )
print( "Usage: ./sct-verify hostname" )
print( "" )
print( "Example:" )
print( " ./sct-verify sni.velox.ch" )
print( "" )
print( "Known hosts implementing SCT TLS Extensions:" )
print( " - sni.velox.ch" )
print( " - ritter.vg" )
quit()
HostName = sys.argv[1]
Args = [ OPENSSL_PATH ]
Args.extend( [ "s_client", "-serverinfo", "18", "-connect", "%s:443" % HostName, "-servername", HostName ])
OpenSSL= subprocess.Popen( Args, stdin=open('/dev/null', 'r'), stdout=subprocess.PIPE, stderr=subprocess.PIPE )
OpenSSL_stdout, OpenSSL_stderr = OpenSSL.communicate()
OpenSSL_exitcode = OpenSSL.wait()
if OpenSSL_exitcode != 0:
print("OpenSSL can't connect to %s" % HostName)
print(OpenSSL_stderr)
quit()
ServerInfo18 = ""
ServerInfo18_Add = False
EECert = ""
EECert_Add = False
for L in OpenSSL_stdout.split('\n'):
if L == "-----BEGIN SERVERINFO FOR EXTENSION 18-----":
ServerInfo18_Add = True
elif L == "-----END SERVERINFO FOR EXTENSION 18-----":
ServerInfo18_Add = False
elif L == "-----BEGIN CERTIFICATE-----":
EECert_Add = True
elif L == "-----END CERTIFICATE-----":
EECert_Add = False
elif ServerInfo18_Add:
if ServerInfo18:
ServerInfo18 = ServerInfo18 + '\n'
ServerInfo18 = ServerInfo18 + L
elif EECert_Add:
if EECert:
EECert = EECert + '\n'
EECert = EECert + L
EECertDER = base64.b64decode( EECert )
Data = base64.b64decode( ServerInfo18 )
DataLen = len(Data)
def ToHex( v ):
if type(v) is int or type(v) is long:
return hex(v)
else:
return ":".join("{:02x}".format(ord(c)) for c in v)
def Read( buf, offset, format ):
Values = struct.unpack_from( format, buf, offset )
NewOffset = offset + struct.calcsize( format )
Ret = ()
Ret = Ret + ( NewOffset, )
Ret = Ret + Values
return Ret
def ReadSCT( SCT ):
print("===========================================================")
Offset = 0
Offset, SCTVersion = Read( SCT, Offset, "!B" )
Offset, SCTLogID = Read( SCT, Offset, "!32s" )
Base64LogID = base64.b64encode( SCTLogID )
Offset, SCTTimestamp = Read( SCT, Offset, "!Q" )
Offset, SCTExtensionsLen = Read( SCT, Offset, "!H" )
#FIXME
if SCTExtensionsLen > 0:
print("Extensions length > 0; not implemented")
return
Offset, SCTSignatureAlgHash = Read( SCT, Offset, "!B" )
Offset, SCTSignatureAlgSign = Read( SCT, Offset, "!B" )
Offset, SCTSignatureLen = Read( SCT, Offset, "!H" )
Offset, SCTSignature = Read( SCT, Offset, "!%ss" % SCTSignatureLen )
# print SCT information
print( "Version : %s" % ToHex( SCTVersion ) )
SCTLogID1, SCTLogID2 = struct.unpack( "!16s16s", SCTLogID )
print( "LogID : %s" % ToHex( SCTLogID1 ) )
print( " %s" % ToHex( SCTLogID2 ) )
print( "LogID b64 : %s" % Base64LogID )
print( "Timestamp : %s (%s)" % ( SCTTimestamp, ToHex( SCTTimestamp ) ) )
print( "Extensions: %s (%s)" % ( SCTExtensionsLen, ToHex( SCTExtensionsLen )) )
print( "Algorithms: %s/%s (hash/sign)" % ( ToHex( SCTSignatureAlgHash ), ToHex ( SCTSignatureAlgSign ) ))
SigOffset = 0
while SigOffset < len( SCTSignature ):
if len( SCTSignature ) - SigOffset > 16:
SigBytesToRead = 16
else:
SigBytesToRead = len( SCTSignature ) - SigOffset
SigBytes = struct.unpack_from( "!%ss" % SigBytesToRead, SCTSignature, SigOffset )[0]
if SigOffset == 0:
print( "Signature : %s" % ToHex( SigBytes ) )
else:
print( " %s" % ToHex( SigBytes ) )
SigOffset = SigOffset + SigBytesToRead
# look for signing log and its key
PubKey = None
for Log in LOGS:
if Log["LogID"] == Base64LogID:
print( "Log found : %s" % Log["Name"])
PubKey = Log["Key"]
print PubKey
if not PubKey:
print("Log not found")
return
# signed data
# 1 version
# 1 signature_type
# 8 timestamp
# 2 entry_type
# 3 DER lenght
# x DER
# 2 extensions length
EECertDERLen = len( EECertDER )
_, EECertDERLen1, EECertDERLen2, EECertDERLen3 = struct.unpack( "!4B", struct.pack( "!I", EECertDERLen ) )
Data = struct.pack("!BBQhBBB%ssh" % len( EECertDER ), SCTVersion, 0, SCTTimestamp, 0, EECertDERLen1, EECertDERLen2, EECertDERLen3, EECertDER, SCTExtensionsLen )
File = open("tmp-signeddata.bin", "wb")
File.write( Data )
File.close()
File = open("tmp-pubkey.pem", "w")
File.write( PubKey )
File.close()
File = open("tmp-signature.bin", "wb")
File.write( SCTSignature )
File.close()
Args = [ OPENSSL_PATH ]
Args.extend( [ "dgst", "-sha256", "-verify", "tmp-pubkey.pem", "-signature", "tmp-signature.bin", "tmp-signeddata.bin" ] )
OpenSSL= subprocess.Popen( Args, stdin=open('/dev/null', 'r'), stdout=subprocess.PIPE, stderr=subprocess.PIPE )
OpenSSL_stdout, OpenSSL_stderr = OpenSSL.communicate()
OpenSSL_exitcode = OpenSSL.wait()
if OpenSSL_exitcode == 0:
print( "Result : %s" % OpenSSL_stdout )
else:
print( "OpenSSL error - Exit code %d" % OpenSSL_exitcode )
print( OpenSSL_stderr )
Offset = 0
Offset, TLS_ExtensionType, TLS_ExtensionLen = Read( Data, Offset, "!HH" )
Offset, SignedCertificateTimestampListLen = Read( Data, Offset, "!H" )
while Offset < DataLen:
Offset, SCTLen = Read( Data, Offset, "!H" )
Offset, SCT = Read( Data, Offset, "!%ss" % SCTLen )
# print SCT
ReadSCT( SCT )
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