it seems EXP and LOW ciphersuits are gone

[tls-check.git] / tls-check

diff --git a/tls-check b/tls-check
index 33529d9c33d541110cafb64861e01e3bed8bce4b..bb2fc63fb49df50c80ab38be9a73cf708295c421 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
@@ -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
-        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
@@ -112,16 +112,18 @@ 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 = {}
     
-    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
-        cipherInfo = subprocess.check_output(["openssl", "ciphers", "-v", cipher]).decode('UTF-8').strip()
-        assert '\n' not in cipherInfo
+        cipherInfo = subprocess.check_output(["openssl", "ciphers", "-v", "-"+protocol, cipher]).decode('UTF-8').strip()
+        assert '\n' not in cipherInfo, "Cipher "+cipher+" produced unexpected output:\n"+cipherInfo
         cipherInfoFields = cipherInfo.split()
         # get # of bits
         encMatch = re.match(r'^Enc=([0-9A-Za-z]+)\(([0-9]+)\)$', cipherInfoFields[4])
@@ -139,16 +141,10 @@ class CipherPropsProvider:
         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:
+        assert isMedium+isHigh <= 1, "Cipher "+cipher+" is more than one from EXP, LOW, MEDIUM, HIGH"
+        if isMedium:
             strength = CipherStrength.medium
         elif isHigh:
             strength = CipherStrength.high
@@ -156,19 +152,12 @@ class CipherPropsProvider:
             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",
-                        help="Use a STARTTLS variant to establish the TLS connection. Possible values include smpt, imap.")
+                        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]',
@@ -200,7 +189,7 @@ if __name__ == "__main__":
         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))