make script work again

[tls-check.git] / tls-check

diff --git a/tls-check b/tls-check
index f757bdbf535acf718e466315228aa0bc90193d7b..0445084ffafe5194be7418681250682a0a1d7853 100755 (executable)
--- a/tls-check
+++ b/tls-check
@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#!/usr/bin/env python3

 import subprocess, sys, argparse, time, re
 from collections import OrderedDict, namedtuple
 from enum import Enum
 import subprocess, sys, argparse, time, re
 from collections import OrderedDict, namedtuple
 from enum import Enum


@@ -59,7 +59,7 @@ def test_cipher(host, port, protocol, cipher = None, wait_time=0, options=[]):
     try:
         if cipher is not None:
             options = ["-cipher", cipher]+options
     try:
         if cipher is not None:
             options = ["-cipher", cipher]+options

-        subprocess.check_call(["openssl", "s_client", "-"+protocol, "-connect", host+":"+str(port)]+options,
+        subprocess.check_call(["openssl", "s_client", "-"+protocol, "-connect", host+":"+str(port), "-servername", host]+options,

                               stdin=subprocess.DEVNULL, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
     except subprocess.CalledProcessError:
         return False
                               stdin=subprocess.DEVNULL, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
     except subprocess.CalledProcessError:
         return False


@@ -93,36 +93,36 @@ def test_host(host, port, wait_time=0, options=[]):
 # cipher classification
 class CipherStrength(Enum):
     unknown = -1
 # cipher classification
 class CipherStrength(Enum):
     unknown = -1

-    exp = 0
-    low = 1
-    medium = 2

     high = 3
     
     def colorName(self):
     high = 3
     
     def colorName(self):

-        if self == CipherStrength.unknown:
-            return self.name
-        elif self.value == CipherStrength.high.value:
+        if self.value == CipherStrength.high.value:

             return ConsoleFormat.color(self.name, ConsoleFormat.GREEN)
             return ConsoleFormat.color(self.name, ConsoleFormat.GREEN)

-        elif self.value == CipherStrength.medium.value:
-            return ConsoleFormat.color(self.name, ConsoleFormat.YELLOW)

         else:
         else:

-            return ConsoleFormat.color(self.name, ConsoleFormat.RED)
+            return ConsoleFormat.color(self.name, ConsoleFormat.YELLOW)

 
 CipherProps = namedtuple('CipherProps', 'bits, strength, isPfs')
 
 class CipherPropsProvider:
     def __init__(self):
 
 CipherProps = namedtuple('CipherProps', 'bits, strength, isPfs')
 
 class CipherPropsProvider:
     def __init__(self):

-        self.exp = set(list_ciphers("EXP"))
-        self.low = set(list_ciphers("LOW"))
-        self.medium = set(list_ciphers("MEDIUM"))

         self.high = set(list_ciphers("HIGH"))
         self.props = {}
     
         self.high = set(list_ciphers("HIGH"))
         self.props = {}
     

-    def __getProps(self, cipher):
+    def getProps(self, protocol, cipher):
+        # strip the sub-version-number from the protocol
+        pos = protocol.find('_')
+        if pos >= 0:
+            protocol = protocol[:pos]

         # as OpenSSL about this cipher
         # as OpenSSL about this cipher

-        cipherInfo = subprocess.check_output(["openssl", "ciphers", "-v", cipher]).decode('UTF-8').strip()
-        assert '\n' not in cipherInfo
-        cipherInfoFields = cipherInfo.split()
+        cipherInfo = subprocess.check_output(["openssl", "ciphers", "-v", "-"+protocol, cipher]).decode('UTF-8').strip()
+        cipherInfoFields = None
+        for line in cipherInfo.split('\n'):
+            line = line.split()
+            if line[0] == cipher:
+                cipherInfoFields = line
+                break
+        if cipherInfoFields is None:
+            raise Exception("Cannot determine cipher properties of {0} (protocol: {1})".format(cipher, protocol))

         # get # of bits
         encMatch = re.match(r'^Enc=([0-9A-Za-z]+)\(([0-9]+)\)$', cipherInfoFields[4])
         if encMatch is None:
         # get # of bits
         encMatch = re.match(r'^Enc=([0-9A-Za-z]+)\(([0-9]+)\)$', cipherInfoFields[4])
         if encMatch is None:


@@ -139,36 +139,18 @@ class CipherPropsProvider:
         kx = kxMatch.group(1)
         isPfs = kx in ('DH', 'DH(512)', 'ECDH')
         # determine security level
         kx = kxMatch.group(1)
         isPfs = kx in ('DH', 'DH(512)', 'ECDH')
         # determine security level

-        isExp = cipher in self.exp
-        isLow = cipher in self.low
-        isMedium = cipher in self.medium
-        isHigh = cipher in self.high
-        assert isExp+isLow+isMedium+isHigh <= 1, "Cipher is more than one from EXP, LOW, MEDIUM, HIGH"
-        if isExp:
-            strength = CipherStrength.exp
-        elif isLow:
-            strength = CipherStrength.low
-        elif isMedium:
-            strength = CipherStrength.medium
-        elif isHigh:
+        if cipher in self.high:

             strength = CipherStrength.high
         else:
             strength = CipherStrength.unknown
         # done!
         return CipherProps(bits=bits, strength=strength, isPfs=isPfs)
             strength = CipherStrength.high
         else:
             strength = CipherStrength.unknown
         # done!
         return CipherProps(bits=bits, strength=strength, isPfs=isPfs)

-    
-    def getProps(self, cipher):
-        if cipher in self.props:
-            return self.props[cipher]
-        props = self.__getProps(cipher)
-        self.props[cipher] = props
-        return props

 
 # main program
 if __name__ == "__main__":
     parser = argparse.ArgumentParser(description='Check TLS ciphers supported by a host')
     parser.add_argument("--starttls", dest="starttls",
 
 # main program
 if __name__ == "__main__":
     parser = argparse.ArgumentParser(description='Check TLS ciphers supported by a host')
     parser.add_argument("--starttls", dest="starttls",

-                        help="Use a STARTTLS variant to establish the TLS connection. Possible values include smpt, imap, xmpp.")
+                        help="Use a STARTTLS variant to establish the TLS connection. Possible values include smtp, imap.")

     parser.add_argument("--wait-time", "-t", dest="wait_time", default="10",
                         help="Time (in ms) to wait between two connections to the server. Default is 10ms.")
     parser.add_argument("host", metavar='HOST[:PORT]',
     parser.add_argument("--wait-time", "-t", dest="wait_time", default="10",
                         help="Time (in ms) to wait between two connections to the server. Default is 10ms.")
     parser.add_argument("host", metavar='HOST[:PORT]',


@@ -200,7 +182,7 @@ if __name__ == "__main__":
         else:
             for cipher, supported in ciphers.items():
                 if supported:
         else:
             for cipher, supported in ciphers.items():
                 if supported:

-                    cipherProps = propsProvider.getProps(cipher)
+                    cipherProps = propsProvider.getProps(protocol, cipher)

                     fsText = ConsoleFormat.color("FS", ConsoleFormat.GREEN) if cipherProps.isPfs else ConsoleFormat.color("no FS", ConsoleFormat.RED)
                     bitColor = ConsoleFormat.GREEN if cipherProps.bits >= 128 else (ConsoleFormat.YELLOW if cipherProps.bits >= 100 else ConsoleFormat.RED)
                     print("    {0} ({1}, {2}, {3})".format(cipher.ljust(STATE_WIDTH), cipherProps.strength.colorName(), ConsoleFormat.color(str(cipherProps.bits)+" bits", bitColor), fsText))
                     fsText = ConsoleFormat.color("FS", ConsoleFormat.GREEN) if cipherProps.isPfs else ConsoleFormat.color("no FS", ConsoleFormat.RED)
                     bitColor = ConsoleFormat.GREEN if cipherProps.bits >= 128 else (ConsoleFormat.YELLOW if cipherProps.bits >= 100 else ConsoleFormat.RED)
                     print("    {0} ({1}, {2}, {3})".format(cipher.ljust(STATE_WIDTH), cipherProps.strength.colorName(), ConsoleFormat.color(str(cipherProps.bits)+" bits", bitColor), fsText))