Less obvious fake TLS certificate generation
This patch adds the following: * Pre-defined CA certificate subjects * Pre-defined popular website domain names * Fake certificate generation for pre-defined popular website domain signed by fake CA with pre-defined subject It should look less suspicious than "example.com" certificates
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ValdikSS
parent
116347ef66
commit
f66cfc9a5e
2 changed files with 104 additions and 26 deletions
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@ -3,6 +3,7 @@ import logging
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import os
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import ssl
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import hashlib
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import random
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from Config import config
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from util import SslPatch
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@ -11,6 +12,7 @@ from util import helper
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class CryptConnectionManager:
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def __init__(self):
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# TODO: UGLY UGLY UGLY
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# OpenSSL params
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if sys.platform.startswith("win"):
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self.openssl_bin = "src\\lib\\opensslVerify\\openssl.exe"
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@ -19,6 +21,11 @@ class CryptConnectionManager:
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self.openssl_env = {"OPENSSL_CONF": "src/lib/opensslVerify/openssl.cnf"}
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self.crypt_supported = [] # Supported cryptos
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self.cacert_pem = config.data_dir+"/cacert-rsa.pem"
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self.cakey_pem = config.data_dir+"/cakey-rsa.pem"
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self.cert_pem = config.data_dir+"/cert-rsa.pem"
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self.cert_csr = config.data_dir+"/cert-rsa.csr"
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self.key_pem = config.data_dir+"/key-rsa.pem"
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# Select crypt that supported by both sides
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# Return: Name of the crypto
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@ -36,8 +43,8 @@ class CryptConnectionManager:
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ciphers += "!aNULL:!eNULL:!EXPORT:!DSS:!DES:!RC4:!3DES:!MD5:!PSK"
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if server:
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sock_wrapped = ssl.wrap_socket(
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sock, server_side=server, keyfile='%s/key-rsa.pem' % config.data_dir,
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certfile='%s/cert-rsa.pem' % config.data_dir, ciphers=ciphers)
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sock, server_side=server, keyfile=self.key_pem,
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certfile=self.cert_pem, ciphers=ciphers)
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else:
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sock_wrapped = ssl.wrap_socket(sock, ciphers=ciphers)
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if cert_pin:
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@ -50,7 +57,7 @@ class CryptConnectionManager:
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def removeCerts(self):
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if config.keep_ssl_cert:
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return False
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for file_name in ["cert-rsa.pem", "key-rsa.pem"]:
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for file_name in ["cert-rsa.pem", "key-rsa.pem", "cacert-rsa.pem", "cakey-rsa.pem", "cert-rsa.csr"]:
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file_path = "%s/%s" % (config.data_dir, file_name)
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if os.path.isfile(file_path):
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os.unlink(file_path)
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@ -66,15 +73,60 @@ class CryptConnectionManager:
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# Try to create RSA server cert + sign for connection encryption
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# Return: True on success
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def createSslRsaCert(self):
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if os.path.isfile("%s/cert-rsa.pem" % config.data_dir) and os.path.isfile("%s/key-rsa.pem" % config.data_dir):
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casubjects = [
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"/C=US/O=Amazon/OU=Server CA 1B/CN=Amazon",
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"/C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X3",
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"/C=US/O=DigiCert Inc/OU=www.digicert.com/CN = DigiCert SHA2 High Assurance Server CA",
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"/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN = COMODO RSA Domain Validation Secure Server CA"
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]
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fakedomains = [
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"yahoo.com",
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"amazon.com",
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"live.com",
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"microsoft.com",
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"mail.ru",
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"csdn.net",
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"bing.com",
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"amazon.co.jp",
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"office.com",
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"imdb.com",
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"msn.com",
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"samsung.com",
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"huawei.com",
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"ztedevices.com",
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"godaddy.com",
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"w3.org",
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"gravatar.com",
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"creativecommons.org",
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"hatena.ne.jp",
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"adobe.com",
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"opera.com",
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"apache.org",
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"rambler.ru",
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"one.com",
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"nationalgeographic.com",
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"networksolutions.com",
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"php.net",
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"python.org",
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"phoca.cz",
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"debian.org",
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"ubuntu.com",
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"nazwa.pl",
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"symantec.com"
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]
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self.openssl_env['CN'] = random.choice(fakedomains)
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if os.path.isfile(self.cert_pem) and os.path.isfile(self.key_pem):
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return True # Files already exits
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import subprocess
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cmd = "%s req -x509 -newkey rsa:2048 -sha256 -batch -keyout %s -out %s -nodes -config %s" % helper.shellquote(
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# Generate CAcert and CAkey
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cmd = "%s req -new -newkey rsa:2048 -days 3650 -nodes -x509 -subj %s -keyout %s -out %s -batch -config %s" % helper.shellquote(
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self.openssl_bin,
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config.data_dir+"/key-rsa.pem",
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config.data_dir+"/cert-rsa.pem",
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self.openssl_env["OPENSSL_CONF"]
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random.choice(casubjects),
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self.cakey_pem,
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self.cacert_pem,
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self.openssl_env["OPENSSL_CONF"],
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)
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proc = subprocess.Popen(
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cmd.encode(sys.getfilesystemencoding()),
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@ -82,9 +134,46 @@ class CryptConnectionManager:
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)
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back = proc.stdout.read().strip()
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proc.wait()
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logging.debug("Generating RSA cert and key PEM files...%s" % back)
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logging.debug("Generating RSA CAcert and CAkey PEM files...%s" % back)
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if os.path.isfile("%s/cert-rsa.pem" % config.data_dir) and os.path.isfile("%s/key-rsa.pem" % config.data_dir):
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if not (os.path.isfile(self.cacert_pem) and os.path.isfile(self.cakey_pem)):
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logging.error("RSA ECC SSL CAcert generation failed, CAcert or CAkey files not exist.")
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return False
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# Generate certificate key and signing request
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cmd = "%s req -new -newkey rsa:2048 -keyout %s -out %s -subj %s -sha256 -nodes -batch -config %s" % helper.shellquote(
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self.openssl_bin,
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self.key_pem,
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self.cert_csr,
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"/CN="+self.openssl_env['CN'],
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self.openssl_env["OPENSSL_CONF"],
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)
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proc = subprocess.Popen(
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cmd.encode(sys.getfilesystemencoding()),
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shell=True, stderr=subprocess.STDOUT, stdout=subprocess.PIPE, env=self.openssl_env
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)
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back = proc.stdout.read().strip()
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proc.wait()
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logging.debug("Generating certificate key and signing request...%s" % back)
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# Sign request and generate certificate
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cmd = "%s x509 -req -in %s -CA %s -CAkey %s -CAcreateserial -out %s -days 730 -sha256 -extensions x509_ext -extfile %s" % helper.shellquote(
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self.openssl_bin,
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self.cert_csr,
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self.cacert_pem,
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self.cakey_pem,
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self.cert_pem,
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self.openssl_env["OPENSSL_CONF"],
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)
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proc = subprocess.Popen(
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cmd.encode(sys.getfilesystemencoding()),
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shell=True, stderr=subprocess.STDOUT, stdout=subprocess.PIPE, env=self.openssl_env
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)
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back = proc.stdout.read().strip()
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proc.wait()
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logging.debug("Generating RSA cert...%s" % back)
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if os.path.isfile(self.cert_pem) and os.path.isfile(self.key_pem):
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return True
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else:
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logging.error("RSA ECC SSL cert generation failed, cert or key files not exist.")
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@ -1,5 +1,5 @@
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[ req ]
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prompt = no
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prompt = yes
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default_bits = 2048
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default_keyfile = server-key.pem
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distinguished_name = subject
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@ -32,8 +32,8 @@ authorityKeyIdentifier = keyid,issuer
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basicConstraints = CA:FALSE
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keyUsage = digitalSignature, keyEncipherment
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extendedKeyUsage = clientAuth, serverAuth
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subjectAltName = @alternate_names
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nsComment = "OpenSSL Generated Certificate"
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# RFC 5280, Section 4.2.1.12 makes EKU optional
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# CA/Browser Baseline Requirements, Appendix (B)(3)(G) makes me confused
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@ -46,8 +46,8 @@ subjectKeyIdentifier = hash
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basicConstraints = CA:FALSE
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keyUsage = digitalSignature, keyEncipherment
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extendedKeyUsage = clientAuth, serverAuth
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subjectAltName = @alternate_names
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nsComment = "OpenSSL Generated Certificate"
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# RFC 5280, Section 4.2.1.12 makes EKU optional
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# CA/Browser Baseline Requirements, Appendix (B)(3)(G) makes me confused
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@ -55,16 +55,5 @@ nsComment = "OpenSSL Generated Certificate"
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[ alternate_names ]
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DNS.1 = example.com
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DNS.2 = www.example.com
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DNS.3 = mail.example.com
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DNS.4 = ftp.example.com
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# Add these if you need them. But usually you don't want them or
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# need them in production. You may need them for development.
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# DNS.5 = localhost
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# DNS.6 = localhost.localdomain
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# DNS.7 = 127.0.0.1
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# IPv6 localhost
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# DNS.8 = ::1
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DNS.1 = $ENV::CN
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DNS.2 = www.$ENV::CN
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