improved configuration analysis
This commit is contained in:
Julien Vehent
parent
2858ef8116
commit
405b104583
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@ -5,59 +5,218 @@
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#
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# Contributor: Julien Vehent jvehent@mozilla.com [:ulfr]
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import fileinput
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import sys
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import json
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import subprocess
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from collections import defaultdict
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import sys, os, json, subprocess, logging, argparse
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from collections import namedtuple
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# is_fubar assumes that a configuration is not completely messed up
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# and looks for reasons to think otherwise. it will return True if
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# it finds one of these reason
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def is_fubar(results):
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fubar = False
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fubar_ciphers = set(all_ciphers) - set(old_ciphers)
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for conn in results['ciphersuite']:
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if conn['cipher'] in fubar_ciphers:
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return True
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logging.debug(conn['cipher'] + ' is in the list of fubar ciphers')
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fubar = True
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if 'SSLv2' in conn['protocols']:
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return True
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logging.debug('SSLv2 is in the list of fubar protocols')
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fubar = True
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if conn['pubkey'] < 2048:
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return True
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return False
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logging.debug(conn['pubkey'] + ' is a fubar pubkey size')
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fubar = True
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if 'md5WithRSAEncryption' in conn['sigalg']:
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logging.debug(conn['sigalg']+ ' is a fubar cert signature')
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fubar = True
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if conn['trusted'] == 'False':
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logging.debug('The certificate is not trusted, which is quite fubar')
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fubar = True
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return fubar
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# is_old assumes a configuration *is* old, and will return False if
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# the parameters of an old configuration are not found. Those parameters
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# are defined in https://wiki.mozilla.org/Security/Server_Side_TLS#Old_backward_compatibility
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def is_old(results):
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lvl = 'old'
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old = True
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has_sslv3 = False
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has_3des = False
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has_sha1 = True
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has_dhparam = True
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has_ocsp = True
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all_proto = []
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for conn in results['ciphersuite']:
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# flag unwanted ciphers
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if conn['cipher'] not in old_ciphers:
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return False
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if 'SSLv3' not in conn['protocols']:
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return False
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logging.debug(conn['cipher'] + ' is not in the list of old ciphers')
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failures[lvl].append("remove cipher " + conn['cipher'])
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old = False
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# verify required 3des cipher is present
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if conn['cipher'] == 'DES-CBC3-SHA':
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has_3des = True
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# verify required ssl3 protocol is present
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if 'SSLv3' in conn['protocols']:
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has_sslv3 = True
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for proto in conn['protocols']:
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if proto not in all_proto:
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all_proto.append(proto)
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# verify required sha1 signature is used
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if 'sha1WithRSAEncryption' not in conn['sigalg']:
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return False
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return True
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logging.debug(conn['sigalg'][0] + ' is a not an old signature')
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old = False
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has_sha1 = False
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# verify required pfs parameter is used
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if conn['cipher'][0:2] == 'DHE':
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if conn['pfs'] != 'DH,1024bits':
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logging.debug(conn['pfs']+ ' is not a good DH parameters for the old configuration')
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old = False
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has_dhparam = False
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if conn['ocsp_stapling'] == 'False':
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has_ocsp = False
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missing_ciphers = set(old_ciphers) - set(all_ciphers)
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for cipher in missing_ciphers:
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logging.debug("missing cipher " + cipher + " wanted in the " + lvl + " configuration")
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failures[lvl].append('add cipher ' + cipher)
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extra_proto = set(all_proto) - set(['SSLv3', 'TLSv1', 'TLSv1.1', 'TLSv1.2'])
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for proto in extra_proto:
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logging.debug("found protocol not wanted in the old configuration:" + proto)
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failures[lvl].append('disable ' + proto)
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modern = False
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missing_proto = set(['SSLv3', 'TLSv1', 'TLSv1.1', 'TLSv1.2']) - set(all_proto)
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for proto in missing_proto:
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logging.debug("missing protocol wanted in the old configuration:" + proto)
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failures[lvl].append('enable ' + proto)
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if not has_sslv3:
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logging.debug("SSLv3 is not supported and required by the old configuration")
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old = False
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if not has_3des:
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logging.debug("DES-CBC3-SHA is not supported and required by the old configuration")
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failures[lvl].append("add cipher DES-CBC3-SHA")
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old = False
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if not has_sha1:
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failures[lvl].append("use a certificate with sha1WithRSAEncryption signature")
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old = False
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if not has_dhparam:
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failures[lvl].append("use a DH parameter of 1024 bits")
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old = False
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if not has_ocsp:
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failures[lvl].append("enable OCSP Stapling")
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return old
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# is_intermediate is similar to is_old but for intermediate configuration from
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# https://wiki.mozilla.org/Security/Server_Side_TLS#Intermediate_compatibility_.28default.29
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def is_intermediate(results):
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lvl = 'intermediate'
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inter = True
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has_tls1 = False
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has_aes = False
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has_dhparam = True
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has_sha256 = True
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has_ocsp = True
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all_proto = []
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for conn in results['ciphersuite']:
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if conn['cipher'] not in intermediate_ciphers:
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return False
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if len(set(conn['protocols']) - set(['TLSv1', 'TLSv1.1', 'TLSv1.2'])) > 0:
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return False
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return True
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logging.debug(conn['cipher'] + ' is not in the list of intermediate ciphers')
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failures[lvl].append("remove cipher " + conn['cipher'])
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inter = False
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if conn['cipher'] == 'AES128-SHA':
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has_aes = True
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for proto in conn['protocols']:
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if proto not in all_proto:
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all_proto.append(proto)
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if 'TLSv1' in conn['protocols']:
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has_tls1 = True
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if 'sha256WithRSAEncryption' not in conn['sigalg']:
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logging.debug(conn['sigalg'][0] + ' is a not an intermediate signature')
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inter = False
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has_sha256 = False
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if conn['cipher'][0:2] == 'DHE':
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if conn['pfs'] != 'DH,2048bits':
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logging.debug(conn['pfs']+ ' is not a good DH parameters for the old configuration')
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inter = False
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has_dhparam = False
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if conn['ocsp_stapling'] == 'False':
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has_ocsp = False
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extra_proto = set(all_proto) - set(['TLSv1', 'TLSv1.1', 'TLSv1.2'])
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for proto in extra_proto:
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logging.debug("found protocol not wanted in the intermediate configuration:" + proto)
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failures[lvl].append('disable ' + proto)
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modern = False
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missing_proto = set(['TLSv1', 'TLSv1.1', 'TLSv1.2']) - set(all_proto)
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for proto in missing_proto:
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logging.debug("missing protocol wanted in the intermediate configuration:" + proto)
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failures[lvl].append('enable ' + proto)
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if not has_tls1:
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logging.debug("TLSv1 is not supported and required by the old configuration")
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inter = False
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if not has_aes:
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logging.debug("AES128-SHA is not supported and required by the intermediate configuration")
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failures[lvl].append("add cipher AES128-SHA")
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inter = False
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if not has_sha256:
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failures[lvl].append("use a certificate with sha256WithRSAEncryption signature")
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inter = False
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if not has_dhparam:
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failures[lvl].append("use a DH parameter of 2048 bits")
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inter = False
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if not has_ocsp:
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failures[lvl].append("enable OCSP Stapling")
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return inter
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# is_modern is similar to is_old but for modern configuration from
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# https://wiki.mozilla.org/Security/Server_Side_TLS#Modern_compatibility
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def is_modern(results):
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lvl = 'modern'
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modern = True
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has_dhparam = True
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has_sha256 = True
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has_ocsp = True
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all_proto = []
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for conn in results['ciphersuite']:
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if conn['cipher'] not in modern_ciphers:
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errors["modern"]["ciphers"].append(conn['cipher'])
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return False
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if len(set(conn['protocols']) - set(['TLSv1.1', 'TLSv1.2'])) > 0:
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# deprecated protocols are supported
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return False
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return True
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logging.debug(conn['cipher'] + ' is not in the list of modern ciphers')
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failures[lvl].append("remove cipher " + conn['cipher'])
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modern = False
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for proto in conn['protocols']:
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if proto not in all_proto:
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all_proto.append(proto)
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if 'sha256WithRSAEncryption' not in conn['sigalg']:
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logging.debug(conn['sigalg'][0] + ' is a not an intermediate signature')
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inter = False
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has_sha256 = False
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if conn['cipher'][0:2] == 'DHE':
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if conn['pfs'] != 'DH,2048bits':
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logging.debug(conn['pfs']+ ' is not a good DH parameters for the old configuration')
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inter = False
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has_dhparam = False
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if conn['ocsp_stapling'] == 'False':
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has_ocsp = False
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extra_proto = set(all_proto) - set(['TLSv1.1', 'TLSv1.2'])
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for proto in extra_proto:
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logging.debug("found protocol not wanted in the modern configuration:" + proto)
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failures[lvl].append('disable ' + proto)
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modern = False
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missing_proto = set(['TLSv1.1', 'TLSv1.2']) - set(all_proto)
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for proto in missing_proto:
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logging.debug("missing protocol wanted in the modern configuration:" + proto)
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failures[lvl].append('enable ' + proto)
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if not has_sha256:
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failures[lvl].append("use a certificate with sha256WithRSAEncryption signature")
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modern = False
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if not has_dhparam:
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failures[lvl].append("use a DH parameter of 2048 bits")
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modern = False
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if not has_ocsp:
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failures[lvl].append("enable OCSP Stapling")
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return modern
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def is_ordered(results, ciphersuite):
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return True
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def evaluate(results):
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def evaluate_all(results):
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status = "obscure unknown ssl"
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if len(results['ciphersuite']) == 0:
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status = "no ssl"
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return "no ssl"
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if is_modern(results):
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if is_ordered(results, modern_ciphers):
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@ -78,44 +237,122 @@ def evaluate(results):
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status = "old ssl with bad ordering"
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if is_fubar(results):
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status = "fubar ssl"
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return "fubar ssl"
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return status
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def process_results(data):
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def process_results(data, level=None):
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results = dict()
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# initialize the failures struct
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global failures
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failures = dict()
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failures['old'] = []
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failures['intermediate'] = []
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failures['modern'] = []
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try:
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results = json.loads(data)
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except ValueError, e:
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print("invalid json data")
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try:
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if results:
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print(results['target'] + " has " + evaluate(results))
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print(results['target'] + " has " + evaluate_all(results))
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except TypeError, e:
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pass
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def main():
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global all_ciphers, old_ciphers, intermediate_ciphers, modern_ciphers, errors
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all_ciphers = subprocess.check_output(['./openssl', 'ciphers', all_ciphersuite]).rstrip().split(':')
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old_ciphers = subprocess.check_output(['./openssl', 'ciphers', old_ciphersuite]).rstrip().split(':')
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intermediate_ciphers = subprocess.check_output(['./openssl', 'ciphers', intermediate_ciphersuite]).rstrip().split(':')
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modern_ciphers = subprocess.check_output(['./openssl', 'ciphers', modern_ciphersuite]).rstrip().split(':')
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if len(sys.argv) > 1:
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# evaluate target specified as argument
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data = subprocess.check_output(['./cipherscan', '-j', sys.argv[1]])
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process_results(data)
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# print failures
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if level:
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if len(failures[level]) > 0:
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print("\nFailed to pass " + level + " level. The following items are failing:")
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for failure in failures[level]:
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print("* " + failure)
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else:
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# take input from stdin
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for data in fileinput.input():
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if data:
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process_results(data)
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print errors
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# from https://wiki.mozilla.org/Security/Server_Side_TLS
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all_ciphersuite = "ALL:COMPLEMENTOFALL:+aRSA"
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old_ciphersuite = "ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128:AES256:AES:DES-CBC3-SHA:HIGH:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA"
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intermediate_ciphersuite = "ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128:AES256:AES:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA"
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modern_ciphersuite = "ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!3DES:!MD5:!PSK"
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errors = defaultdict(str)
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for lvl in ['old', 'intermediate', 'modern']:
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if len(failures[lvl]) > 0:
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print("\nFailed to pass " + lvl + " level. The following items are failing:")
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for failure in failures[lvl]:
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print("* " + failure)
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def build_ciphers_lists():
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global all_ciphers, old_ciphers, intermediate_ciphers, modern_ciphers, errors
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# from https://wiki.mozilla.org/Security/Server_Side_TLS
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allC = 'ALL:COMPLEMENTOFALL:+aRSA'
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oldC = 'ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-S' \
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'HA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM' \
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'-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-' \
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'AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA' \
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'384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AE' \
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'S128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-' \
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'AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128:AES256:AES:DES-CBC3-SHA:HI' \
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'GH:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-R' \
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'SA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA'
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intC = 'ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-S' \
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'HA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM' \
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'-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-' \
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'AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA' \
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'384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AE' \
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'S128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-' \
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'AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128:AES256:AES:CAMELLIA!aNULL:' \
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'!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC' \
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'3-SHA:!KRB5-DES-CBC3-SHA'
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modernC = 'ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-S' \
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'HA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM' \
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'-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-' \
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'AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA' \
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'384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AE' \
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'S128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-' \
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'AES256-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!3DES:!MD5:!PSK'
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logging.debug('Loading all ciphers: ' + allC)
|
||||
all_ciphers = subprocess.check_output(
|
||||
['./openssl', 'ciphers', allC]).rstrip().split(':')
|
||||
logging.debug('Loading old ciphers: ' + oldC)
|
||||
old_ciphers = subprocess.check_output(
|
||||
['./openssl', 'ciphers', oldC]).rstrip().split(':')
|
||||
logging.debug('Loading intermediate ciphers: ' + intC)
|
||||
intermediate_ciphers = subprocess.check_output(
|
||||
['./openssl', 'ciphers', intC]).rstrip().split(':')
|
||||
logging.debug('Loading modern ciphers: ' + modernC)
|
||||
modern_ciphers = subprocess.check_output(
|
||||
['./openssl', 'ciphers', modernC]).rstrip().split(':')
|
||||
|
||||
def main():
|
||||
parser = argparse.ArgumentParser(
|
||||
description='Analyze cipherscan results and provides guidelines to improve configuration.',
|
||||
usage='\n* Analyze a single target, invokes cipherscan: $ ./analyze.py -t [target]' \
|
||||
'\n* Evaluate json results passed through stdin: $ python analyze.py < target_results.json' \
|
||||
'\nexample: ./analyze.py mozilla.org',
|
||||
epilog='Julien Vehent [:ulfr] - 2014')
|
||||
parser.add_argument('-d', dest='debug', action='store_true',
|
||||
help='debug output')
|
||||
parser.add_argument('infile', nargs='?', type=argparse.FileType('r'),
|
||||
default=sys.stdin, help='cipherscan json results')
|
||||
parser.add_argument('outfile', nargs='?', type=argparse.FileType('w'),
|
||||
default=sys.stdout, help='json formatted analysis')
|
||||
parser.add_argument('-l', dest='level',
|
||||
help='target configuration level [old, intermediate, modern]')
|
||||
parser.add_argument('-t', dest='target',
|
||||
help='analyze a <target>, invokes cipherscan')
|
||||
args = parser.parse_args()
|
||||
|
||||
if args.debug:
|
||||
logging.basicConfig(stream=sys.stderr, level=logging.DEBUG)
|
||||
else:
|
||||
logging.basicConfig(stream=sys.stderr, level=logging.INFO)
|
||||
|
||||
build_ciphers_lists()
|
||||
|
||||
if args.target:
|
||||
# evaluate target specified as argument
|
||||
logging.debug('Invoking cipherscan with target: ' + args.target)
|
||||
data = subprocess.check_output(['./cipherscan', '-j', args.target])
|
||||
process_results(data, args.level)
|
||||
else:
|
||||
if os.fstat(args.infile.fileno()).st_size < 2:
|
||||
logging.error("invalid input file")
|
||||
parser.print_help()
|
||||
sys.exit(1)
|
||||
data = args.infile.readline()
|
||||
logging.debug('Evaluating results from stdin: ' + data)
|
||||
process_results(data, args.level)
|
||||
|
||||
if __name__ == "__main__":
|
||||
main()
|
||||
|
|
|
|||
Loading…
Reference in New Issue