#!/usr/bin/python
-# swede - A tool to create DANE/TLSA (draft 14) records.
+# swede - A tool to create DANE/TLSA (draft 15) records.
# This tool is really simple and not foolproof, it doesn't check the CN in the
# Subject field of the certificate. It also doesn't check if the supplied
# certificate is a CA certificate if usage 1 is specified (or any other
global resolvconf
ctx = unbound.ub_ctx()
ctx.add_ta_file('root.key')
+ ctx.set_option("dlv-anchor-file:", "dlv.isc.org.key")
# Use the local cache
if resolvconf and os.path.isfile(resolvconf):
ctx.resolvconf(resolvconf)
except:
if self.getPort() != '*':
err.append('Port %s not a number' % self.getPort())
- if not self.usage in [0,1,2]:
- err.append('Usage: invalid (%s is not one of 0, 1 or 2)' % self.usage)
+ if not self.usage in [0,1,2,3]:
+ err.append('Usage: invalid (%s is not one of 0, 1, 2 or 3)' % self.usage)
if not self.selector in [0,1]:
err.append('Selector: invalid (%s is not one of 0 or 1)' % self.selector)
if not self.mtype in [0,1,2]:
#parser.add_argument('-6', dest='ipv6', action='store_true',help='use ipv6 networking only')
parser.add_argument('--insecure', action='store_true', default=False, help='Allow use of non-dnssec secured answers')
parser.add_argument('--resolvconf', metavar='/PATH/TO/RESOLV.CONF', action='store', default='', help='Use a recursive resolver from resolv.conf')
- parser.add_argument('-v', '--version', action='version', version='%(prog)s v0.1', help='show version and exit')
+ parser.add_argument('-v', '--version', action='version', version='%(prog)s v0.2', help='show version and exit')
parser.add_argument('host', metavar="hostname")
parser_verify.add_argument('--port', '-p', action='store', default='443', help='The port, or \'*\' where running TLS is located (default: %(default)s).')
parser_create.add_argument('--output', '-o', action='store', default='draft', choices=['draft','rfc','both'], help='The type of output. Draft (private RRtype, 65468), RFC (TLSA) or both (default: %(default)s).')
# Usage of the certificate
- parser_create.add_argument('--usage', '-u', action='store', type=int, default=1, choices=[0,1,2], help='The Usage of the Certificate for Association. \'0\' for CA, \'1\' for End Entity, \'2\' for trust-anchor (default: %(default)s).')
+ parser_create.add_argument('--usage', '-u', action='store', type=int, default=1, choices=[0,1,2,3], help='The Usage of the Certificate for Association. \'0\' for CA, \'1\' for End Entity, \'2\' for trust-anchor, \'3\' for ONLY End-Entity match (default: %(default)s).')
parser_create.add_argument('--selector', '-s', action='store', type=int, default=0, choices=[0,1], help='The Selector for the Certificate for Association. \'0\' for Full Certificate, \'1\' for SubjectPublicKeyInfo (default: %(default)s).')
parser_create.add_argument('--mtype', '-m', action='store', type=int, default=1, choices=[0,1,2], help='The Matching Type of the Certificate for Association. \'0\' for Exact match, \'1\' for SHA-256 hash, \'2\' for SHA-512 (default: %(default)s).')
# First, check if the first three fields have correct values.
if not args.quiet:
print 'Received the following record for name %s:' % record.name
- print '\tUsage:\t\t\t\t%d (%s)' % (record.usage, {0:'CA Constraint', 1:'End-Entity Constraint', 2:'Trust Anchor'}[record.usage])
- print '\tSelector:\t\t\t%d (%s)' % (record.selector, {0:'Certificate', 1:'SubjectPublicKeyInfo'}[record.selector])
- print '\tMatching Type:\t\t\t%d (%s)' % (record.mtype, {0:'Full Certificate', 1:'SHA-256', 2:'SHA-512'}[record.mtype])
+ print '\tUsage:\t\t\t\t%d (%s)' % (record.usage, {0:'CA Constraint', 1:'End-Entity Constraint + chain to CA', 2:'Trust Anchor', 3:'End-Entity'}.get(record.usage, 'INVALID'))
+ print '\tSelector:\t\t\t%d (%s)' % (record.selector, {0:'Certificate', 1:'SubjectPublicKeyInfo'}.get(record.selector, 'INVALID'))
+ print '\tMatching Type:\t\t\t%d (%s)' % (record.mtype, {0:'Full Certificate', 1:'SHA-256', 2:'SHA-512'}.get(record.mtype, 'INVALID'))
print '\tCertificate for Association:\t%s' % record.cert
try:
elif record.usage == 0: # CA constraint
matched = False
# Remove the first (= End-Entity cert) from the chain
+ chain = chain[1:]
for cert in chain:
if verifyCertMatch(record, cert):
matched = True
print 'FAIL (Usage 0): No certificate in the certificate chain offered by the server matches the TLSA record'
if pre_exit == 0: pre_exit = 2
- elif record.usage == 2: # Usage 2, ANY cert in the chain must match (aka 'pick any')
+ elif record.usage == 2: # Usage 2, use the cert in the record as trust anchor
+ #FIXME: doesnt comply to the spec
matched = False
+ previous_issuer = None
for cert in chain:
+ if previous_issuer:
+ if not str(previous_issuer) == str(cert.get_subject()): # The chain cannot be valid
+ print "FAIL: Certificates don't chain"
+ break
+ previous_issuer = cert.get_issuer()
if verifyCertMatch(record, cert):
matched = True
continue
print 'FAIL (usage 2): No certificate in the certificate chain (including the end-entity certificate) offered by the server matches the TLSA record'
if pre_exit == 0: pre_exit = 2
+ elif record.usage == 3: # EE cert MUST match
+ if verifyCertMatch(record,chain[0]):
+ print 'SUCCESS (usage 3): The certificate offered by the server matches the TLSA record'
+ if not args.quiet: print 'The matched certificate has Subject: %s' % chain[0].get_subject()
+ else:
+ print 'FAIL (usage 3): The certificate offered by the server does not match the TLSA record'
+ if pre_exit == 0: pre_exit = 2
+
# Cleanup, just in case
connection.clear()
connection.close()
chain = connection.get_peer_cert_chain()
for chaincert in chain:
- if int(args.usage) == 1:
+ if int(args.usage) == 1 or int(args.usage) == 3:
# The first cert is the end-entity cert
print 'Got a certificate with Subject: %s' % chaincert.get_subject()
cert = chaincert
break
else:
if (int(args.usage) == 0 and chaincert.check_ca()) or int(args.usage) == 2:
- sys.stdout.write('Got a certificate with the following Subject:\n\t%s.\nUse this as certificate to match? [y/N] ' % chaincert.get_subject())
+ sys.stdout.write('Got a certificate with the following Subject:\n\t%s\nUse this as certificate to match? [y/N] ' % chaincert.get_subject())
input_ok = False
while not input_ok:
user_input = raw_input()
else:
print genTLSA(args.host, args.protocol, args.port, cert, args.output, args.usage, args.selector, args.mtype)
+ # Clear the cert from memory (to stop M2Crypto from segfaulting)
+ # And cleanup the connection and context
+ cert=None
+ connection.clear()
+ connection.close()
+ ctx.close()
+
else: # Pass the path to the certificate to the genTLSA function
if args.output == 'both':
print genTLSA(args.host, args.protocol, args.port, args.certificate, 'draft', args.usage, args.selector, args.mtype)
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