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refactor pfs evaluation in separate function
This commit is contained in:
Julien Vehent
parent
ddfaa6722d
commit
244e9ca9f2
72
analyze.py
72
analyze.py
@ -10,6 +10,26 @@ from collections import namedtuple
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from datetime import datetime
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from copy import deepcopy
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# has_good_pfs compares a given PFS configuration with a target
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# dh parameter a target elliptic curve, and return true if good
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# if `must_match` is True, the exact values are expected, if not
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# larger pfs values than the targets are acceptable
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def has_good_pfs(pfs, target_dh, target_ecc, must_match=False):
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if 'ECDH,' in pfs:
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# split string, expected format is 'ECDH,P-256,256bits'
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ecc = pfs.split(',')[2].split('b')[0]
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if int(ecc) < target_ecc:
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return False
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if must_match and int(ecc) != target_ecc:
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return False
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elif 'DH,' in pfs:
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dhparam = pfs.split(',')[1].split('b')[0]
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if int(dhparam) < target_dh:
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return False
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if must_match and int(dhparam) != target_dh:
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return False
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return True
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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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@ -20,7 +40,7 @@ def is_fubar(results):
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has_wrong_pubkey = False
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has_md5_sig = False
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has_untrust_cert = False
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has_wrong_dhparam = False
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has_wrong_pfs = 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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@ -36,11 +56,10 @@ def is_fubar(results):
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logging.debug(conn['pubkey'] + ' is a fubar pubkey size')
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fubar = True
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if conn['pfs'] != 'None':
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dhparam = conn['pfs'].split(',')[1].split('b')[0]
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if int(dhparam) < 1024:
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logging.debug(conn['pfs']+ ' is a fubar DH parameters')
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if not has_good_pfs(conn['pfs'], 1024, 128):
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logging.debug(conn['pfs']+ ' is a fubar PFS parameters')
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fubar = True
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has_wrong_dhparam = True
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has_wrong_pfs = True
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if 'md5WithRSAEncryption' in conn['sigalg']:
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has_md5_sig = True
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logging.debug(conn['sigalg']+ ' is a fubar cert signature')
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@ -57,8 +76,8 @@ def is_fubar(results):
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failures[lvl].append("don't use a public key smaller than 2048 bits")
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if has_untrust_cert:
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failures[lvl].append("don't use an untrusted or self-signed certificate")
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if has_wrong_dhparam:
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failures[lvl].append("don't use a Diffie-Hellman parameter smaller than 1024 bits")
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if has_wrong_pfs:
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failures[lvl].append("don't use DHE smaller than 1024bits or ECC smaller than 128bits")
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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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@ -70,7 +89,7 @@ def is_old(results):
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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_pfs = 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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@ -95,11 +114,10 @@ def is_old(results):
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has_sha1 = False
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# verify required pfs parameter is used
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if conn['pfs'] != 'None':
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dhparam = conn['pfs'].split(',')[1].split('b')[0]
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if int(dhparam) != 1024:
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logging.debug(conn['pfs']+ ' is not a good DH parameters for the old configuration')
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if not has_good_pfs(conn['pfs'], 1024, 256, True):
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logging.debug(conn['pfs']+ ' is not a good PFS parameter for the old configuration')
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old = False
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has_dhparam = False
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has_pfs = 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(['SSLv3', 'TLSv1', 'TLSv1.1', 'TLSv1.2'])
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@ -121,8 +139,8 @@ def is_old(results):
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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 exactly 1024 bits")
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if not has_pfs:
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failures[lvl].append("use DHE of 1024bits and ECC of 256bits")
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old = False
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if not has_ocsp:
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failures[lvl].append("consider enabling OCSP Stapling")
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@ -137,7 +155,7 @@ def is_intermediate(results):
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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_pfs = 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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@ -157,11 +175,10 @@ def is_intermediate(results):
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logging.debug(conn['sigalg'][0] + ' is a not an intermediate signature')
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has_sha256 = False
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if conn['pfs'] != 'None':
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dhparam = conn['pfs'].split(',')[1].split('b')[0]
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if int(dhparam) < 2048:
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logging.debug(conn['pfs']+ ' is not a good DH parameters for the intermediate configuration')
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if not has_good_pfs(conn['pfs'], 2048, 256):
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logging.debug(conn['pfs']+ ' is not a good PFS parameter for the intermediate configuration')
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inter = False
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has_dhparam = False
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has_pfs = 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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@ -182,8 +199,8 @@ def is_intermediate(results):
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inter = False
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if not has_sha256:
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failures[lvl].append("consider using a SHA-256 certificate")
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if not has_dhparam:
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failures[lvl].append("use a DH parameter of 2048 bits or more")
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if not has_pfs:
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failures[lvl].append("use DHE of at least 2048bits and ECC or at least 256bits")
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inter = False
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if not has_ocsp:
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failures[lvl].append("consider enabling OCSP Stapling")
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@ -196,7 +213,7 @@ def is_intermediate(results):
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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_pfs = 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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@ -213,11 +230,10 @@ def is_modern(results):
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modern = False
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has_sha256 = False
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if conn['pfs'] != 'None':
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dhparam = conn['pfs'].split(',')[1].split('b')[0]
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if int(dhparam) < 2048:
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logging.debug(conn['pfs']+ ' is not a good DH parameters for the modern configuration')
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if not has_good_pfs(conn['pfs'], 2048, 256):
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logging.debug(conn['pfs']+ ' is not a good PFS parameter for the modern configuration')
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modern = False
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has_dhparam = False
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has_pfs = 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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@ -232,8 +248,8 @@ def is_modern(results):
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if not has_sha256:
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failures[lvl].append("use a SHA-256 certificate")
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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 or more")
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if not has_pfs:
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failures[lvl].append("use DHE of at least 2048bits and ECC or at least 256bits")
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modern = False
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if not has_ocsp:
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failures[lvl].append("consider enabling OCSP Stapling")
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