3 # swede - A tool to create DANE/TLSA records.
4 # This tool is really simple and not foolproof, it doesn't check the CN in the
5 # Subject field of the certificate. It also doesn't check if the supplied
6 # certificate is a CA certificate if usage 1 is specified (or any other
7 # checking for that matter).
9 # Usage is explained when running this program with --help
11 # This tool is loosly based on the dane tool in the sshfp package by Paul
12 # Wouters and Christopher Olah from xelerance.com.
14 # Copyright Pieter Lexis (pieter.lexis@os3.nl)
16 # License: GNU GENERAL PUBLIC LICENSE Version 2 or later
23 from M2Crypto import X509, SSL
24 from binascii import a2b_hex, b2a_hex
25 from hashlib import sha256, sha512
26 from ipaddr import IPv4Address, IPv6Address
29 def genTLSA(hostname, protocol, port, certificate, output='generic', usage=1, selector=0, mtype=1):
30 """This function generates a TLSARecord object using the data passed in the parameters,
31 it then validates the record and returns the RR as a string.
33 # check if valid vars were passed
34 if hostname[-1] != '.':
37 certificate = loadCert(certificate)
39 raise Exception('Cannot load certificate from disk')
41 # Create the record without a certificate
43 record = TLSARecord(name='%s._%s.%s'%(port,protocol,hostname), usage=usage, selector=selector, mtype=mtype, cert ='')
45 record = TLSARecord(name='_%s._%s.%s'%(port,protocol,hostname), usage=usage, selector=selector, mtype=mtype, cert ='')
46 # Check if the record is valid
48 if record.selector == 0:
49 # Hash the Full certificate
50 record.cert = getHash(certificate, record.mtype)
52 # Hash only the SubjectPublicKeyInfo
53 record.cert = getHash(certificate.get_pubkey(), record.mtype)
55 record.isValid(raiseException=True)
57 if output == 'generic':
58 return record.getRecord(generic=True)
59 return record.getRecord()
61 def getA(hostname, secure=True):
62 """Gets a list of A records for hostname, returns a list of ARecords"""
64 records = getRecords(hostname, rrtype='A', secure=secure)
65 except InsecureLookupException, e:
68 except DNSLookupError, e:
69 print 'Unable to resolve %s: %s' % (hostname, str(e))
72 for record in records:
73 ret.append(ARecord(hostname, str(IPv4Address(int(b2a_hex(record),16)))))
76 def getAAAA(hostname, secure=True):
77 """Gets a list of A records for hostname, returns a list of AAAARecords"""
79 records = getRecords(hostname, rrtype='AAAA', secure=secure)
80 except InsecureLookupException, e:
83 except DNSLookupError, e:
84 print 'Unable to resolve %s: %s' % (hostname, str(e))
87 for record in records:
88 ret.append(AAAARecord(hostname, str(IPv6Address(int(b2a_hex(record),16)))))
91 def getVerificationErrorReason(num):
92 """This function returns the name of the X509 Error based on int(num)
94 # These were taken from the M2Crypto.m2 code
96 50: "X509_V_ERR_APPLICATION_VERIFICATION",
97 22: "X509_V_ERR_CERT_CHAIN_TOO_LONG",
98 10: "X509_V_ERR_CERT_HAS_EXPIRED",
99 9: "X509_V_ERR_CERT_NOT_YET_VALID",
100 28: "X509_V_ERR_CERT_REJECTED",
101 23: "X509_V_ERR_CERT_REVOKED",
102 7: "X509_V_ERR_CERT_SIGNATURE_FAILURE",
103 27: "X509_V_ERR_CERT_UNTRUSTED",
104 12: "X509_V_ERR_CRL_HAS_EXPIRED",
105 11: "X509_V_ERR_CRL_NOT_YET_VALID",
106 8: "X509_V_ERR_CRL_SIGNATURE_FAILURE",
107 18: "X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT",
108 14: "X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD",
109 13: "X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD",
110 15: "X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD",
111 16: "X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD",
112 24: "X509_V_ERR_INVALID_CA",
113 26: "X509_V_ERR_INVALID_PURPOSE",
114 17: "X509_V_ERR_OUT_OF_MEM",
115 25: "X509_V_ERR_PATH_LENGTH_EXCEEDED",
116 19: "X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN",
117 6: "X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY",
118 4: "X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE",
119 5: "X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE",
120 3: "X509_V_ERR_UNABLE_TO_GET_CRL",
121 2: "X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT",
122 20: "X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY",
123 21: "X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE",
124 0: "X509_V_OK"}[int(num)]
126 def getRecords(hostname, rrtype='A', secure=True):
127 """Do a lookup of a name and a rrtype, returns a list of binary coded strings. Only queries for rr_class IN."""
129 ctx = unbound.ub_ctx()
130 ctx.add_ta_file('root.key')
131 ctx.set_option("dlv-anchor-file:", "dlv.isc.org.key")
132 # Use the local cache
133 if resolvconf and os.path.isfile(resolvconf):
134 ctx.resolvconf(resolvconf)
136 if type(rrtype) == str:
137 if 'RR_TYPE_' + rrtype in dir(unbound):
138 rrtype = getattr(unbound, 'RR_TYPE_' + rrtype)
140 raise Exception('Error: unknown RR TYPE: %s.' % rrtype)
141 elif type(rrtype) != int:
142 raise Exception('Error: rrtype in wrong format, neither int nor str.')
144 status, result = ctx.resolve(hostname, rrtype=rrtype)
145 if status == 0 and result.havedata:
146 if not result.secure:
148 # The data is insecure and a secure lookup was requested
149 raise InsecureLookupException('Error: query data not secure and secure data requested, unable to continue')
151 print >> sys.stderr, 'Warning: query data is not secure.'
152 # If we are here the data was either secure or insecure data is accepted
153 return result.data.raw
155 raise DNSLookupError('Unsuccesful lookup or no data returned for rrtype %s.' % rrtype)
157 def getHash(certificate, mtype):
158 """Hashes the certificate based on the mtype.
159 The certificate should be an M2Crypto.X509.X509 object (or the result of the get_pubkey() function on said object)
161 certificate = certificate.as_der()
163 return b2a_hex(certificate)
165 return sha256(certificate).hexdigest()
167 return sha512(certificate).hexdigest()
169 raise Exception('mtype should be 0,1,2')
171 def getTLSA(hostname, port=443, protocol='tcp', secure=True):
173 This function tries to do a secure lookup of the TLSA record.
174 At the moment it requests the TYPE52 record and parses it into a 'valid' TLSA record
175 It returns a list of TLSARecord objects
177 if hostname[-1] != '.':
180 if not protocol.lower() in ['tcp', 'udp', 'sctp']:
181 raise Exception('Error: unknown protocol: %s. Should be one of tcp, udp or sctp' % protocol)
184 records = getRecords('*._%s.%s' % (protocol.lower(), hostname), rrtype=52, secure=secure)
186 records = getRecords('_%s._%s.%s' % (port, protocol.lower(), hostname), rrtype=52, secure=secure)
187 except InsecureLookupException, e:
190 except DNSLookupError, e:
191 print 'Unable to resolve %s: %s' % (hostname, str(e))
194 for record in records:
195 hexdata = b2a_hex(record)
197 ret.append(TLSARecord('*._%s.%s' % (protocol.lower(), hostname), int(hexdata[0:2],16), int(hexdata[2:4],16), int(hexdata[4:6],16), hexdata[6:]))
199 ret.append(TLSARecord('_%s._%s.%s' % (port, protocol.lower(), hostname), int(hexdata[0:2],16), int(hexdata[2:4],16), int(hexdata[4:6],16), hexdata[6:]))
202 def loadCert(certificate):
203 """Returns an M2Crypto.X509.X509 object"""
204 if isinstance(certificate, X509.X509):
205 # nothing to be done :-)
208 # Maybe we were passed a path
209 return X509.load_cert(certificate)
211 # Can't load the cert
212 raise Exception('Unable to load certificate %s.' % certificate)
214 def verifyCertMatch(record, cert):
216 Verify the certificate with the record.
217 record should be a TLSARecord and cert should be a M2Crypto.X509.X509
219 if not isinstance(cert, X509.X509):
221 if not isinstance(record, TLSARecord):
224 if record.selector == 1:
225 certhash = getHash(cert.get_pubkey(), record.mtype)
227 certhash = getHash(cert, record.mtype)
232 if certhash == record.cert:
238 """When instanciated, this class contains all the fields of a TLSA record.
240 def __init__(self, name, usage, selector, mtype, cert):
241 """name is the name of the RR in the format: /^(_\d{1,5}|\*)\._(tcp|udp|sctp)\.([a-z0-9]*\.){2,}$/
242 usage, selector and mtype should be an integer
243 cert should be a hexidecimal string representing the certificate to be matched field
246 self.rrtype = 52 # TLSA per https://www.iana.org/assignments/dns-parameters
247 self.rrclass = 1 # IN
248 self.name = str(name)
249 self.usage = int(usage)
250 self.selector = int(selector)
251 self.mtype = int(mtype)
252 self.cert = str(cert)
254 raise Exception('Invalid value passed, unable to create a TLSARecord')
256 def getRecord(self, generic=False):
257 """Returns the RR string of this TLSARecord, either in rfc (default) or generic format"""
259 return '%s IN TYPE52 \# %s %s%s%s%s' % (self.name, (len(self.cert)/2)+3 , self._toHex(self.usage), self._toHex(self.selector), self._toHex(self.mtype), self.cert)
260 return '%s IN TLSA %s %s %s %s' % (self.name, self.usage, self.selector, self.mtype, self.cert)
262 def _toHex(self, val):
263 """Helper function to create hex strings from integers"""
266 def isValid(self, raiseException=False):
267 """Check whether all fields in the TLSA record are conforming to the spec and check if the port, protocol and name are good"""
270 if not 1 <= int(self.getPort()) <= 65535:
271 err.append('Port %s not within correct range (1 <= port <= 65535)' % self.getPort())
273 if self.getPort() != '*':
274 err.append('Port %s not a number' % self.getPort())
275 if not self.usage in [0,1,2,3]:
276 err.append('Usage: invalid (%s is not one of 0, 1, 2 or 3)' % self.usage)
277 if not self.selector in [0,1]:
278 err.append('Selector: invalid (%s is not one of 0 or 1)' % self.selector)
279 if not self.mtype in [0,1,2]:
280 err.append('Matching Type: invalid (%s is not one of 0, 1 or 2)' % self.mtype)
281 if not self.isNameValid():
282 err.append('Name (%s) is not in the correct format: _portnumber._transportprotocol.hostname.dom.' % self.name)
283 # A certificate length of 0 is accepted
284 if self.mtype in [1,2] and len(self.cert) != 0:
285 if not len(self.cert) == {1:64,2:128}[self.mtype]:
286 err.append('Certificate for Association: invalid (Hash length does not match hash-type in Matching Type(%s))' % {1:'SHA-256',2:'SHA-512'}[self.mtype])
288 if not raiseException:
291 msg = 'The TLSA record is invalid.'
293 msg += '\n\t%s' % error
294 raise RecordValidityException(msg)
298 def isNameValid(self):
299 """Check if the name if in the correct format"""
300 if not re.match('^(_\d{1,5}|\*)\._(tcp|udp|sctp)\.([-a-z0-9]*\.){2,}$', self.name):
304 def getProtocol(self):
305 """Returns the protocol based on the name"""
306 return re.split('\.', self.name)[1][1:]
309 """Returns the port based on the name"""
310 if re.split('\.', self.name)[0][0] == '*':
313 return re.split('\.', self.name)[0][1:]
316 """An object representing an A Record (IPv4 address)"""
317 def __init__(self, hostname, address):
319 self.hostname = hostname
320 self.address = address
327 IPv4Address(self.address)
333 """An object representing an AAAA Record (IPv6 address)"""
334 def __init__(self, hostname, address):
336 self.address = address
343 IPv6Address(self.address)
349 class RecordValidityException(Exception):
352 class InsecureLookupException(Exception):
355 class DNSLookupError(Exception):
358 if __name__ == '__main__':
361 parser = argparse.ArgumentParser(description='Create and verify DANE records.', epilog='This tool has a few limitations: it only IPv4 for SSL connections.')
363 subparsers = parser.add_subparsers(title='Functions', help='Available functions, see %(prog)s function -h for function-specific help')
364 parser_verify = subparsers.add_parser('verify', help='Verify a TLSA record, exit 0 when all TLSA records are matched, exit 2 when a record does not match the received certificate, exit 1 on error.', epilog='Caveat: For TLSA validation, this program chases through the certificate chain offered by the server, not its local certificates.')
365 parser_verify.set_defaults(function='verify')
366 parser_create = subparsers.add_parser('create', help='Create a TLSA record')
367 parser_create.set_defaults(function='create')
369 #parser.add_argument('-4', dest='ipv4', action='store_true',help='use ipv4 networking only')
370 #parser.add_argument('-6', dest='ipv6', action='store_true',help='use ipv6 networking only')
371 parser.add_argument('--insecure', action='store_true', default=False, help='Allow use of non-dnssec secured answers')
372 parser.add_argument('--resolvconf', metavar='/PATH/TO/RESOLV.CONF', action='store', default='', help='Use a recursive resolver from resolv.conf')
373 parser.add_argument('-v', '--version', action='version', version='%(prog)s v0.2', help='show version and exit')
374 parser.add_argument('host', metavar="hostname")
376 parser_verify.add_argument('--port', '-p', action='store', default='443', help='The port, or \'*\' where running TLS is located (default: %(default)s).')
377 parser_verify.add_argument('--protocol', action='store', choices=['tcp','udp','sctp'], default='tcp', help='The protocol the TLS service is using (default: %(default)s).')
378 parser_verify.add_argument('--only-rr', '-o', action='store_true', help='Only verify that the TLSA resource record is correct (do not check certificate)')
379 parser_verify.add_argument('--ca-cert', metavar='/PATH/TO/CERTSTORE', action='store', default = '/etc/ssl/certs/', help='Path to a CA certificate or a directory containing the certificates (default: %(default)s)')
380 parser_verify.add_argument('--quiet', '-q', action='store_true', help='Only print the result of the validation')
382 parser_create.add_argument('--port', '-p', action='store', type=int, default=443, help='The port where running TLS is located (default: %(default)s).')
383 parser_create.add_argument('--protocol', action='store', choices=['tcp','udp','sctp'], default='tcp', help='The protocol the TLS service is using (default: %(default)s).')
384 parser_create.add_argument('--certificate', '-c', help='The certificate used for the host. If certificate is empty, the certificate will be downloaded from the server')
385 parser_create.add_argument('--output', '-o', action='store', default='generic', choices=['generic','rfc','both'], help='The type of output. Generic (RFC 3597, TYPE52), RFC (TLSA) or both (default: %(default)s).')
387 # Usage of the certificate
388 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).')
389 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).')
390 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).')
392 args = parser.parse_args()
394 if args.host[-1] != '.':
399 if os.path.isfile(args.resolvconf):
400 resolvconf = args.resolvconf
402 print >> sys.stdout, '%s is not a file. Unable to use it as resolv.conf' % args.resolvconf
407 # not operations are fun!
408 secure = not args.insecure
410 if args.function == 'verify':
411 records = getTLSA(args.host, args.port, args.protocol, secure)
412 if len(records) == 0:
415 for record in records:
417 # First, check if the first three fields have correct values.
419 print 'Received the following record for name %s:' % record.name
420 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'))
421 print '\tSelector:\t\t\t%d (%s)' % (record.selector, {0:'Certificate', 1:'SubjectPublicKeyInfo'}.get(record.selector, 'INVALID'))
422 print '\tMatching Type:\t\t\t%d (%s)' % (record.mtype, {0:'Full Certificate', 1:'SHA-256', 2:'SHA-512'}.get(record.mtype, 'INVALID'))
423 print '\tCertificate for Association:\t%s' % record.cert
426 record.isValid(raiseException=True)
427 except RecordValidityException, e:
428 print >> sys.stderr, 'Error: %s' % str(e)
432 print 'This record is valid (well-formed).'
435 # Go to the next record
438 # When we are here, The user also wants to verify the certificates with the record
439 if args.protocol != 'tcp':
440 print >> sys.stderr, 'Only SSL over TCP is supported (sorry)'
444 print 'Attempting to verify the record with the TLS service...'
445 addresses = getA(args.host, secure=secure) + getAAAA(args.host, secure=secure)
446 for address in addresses:
448 print 'Got the following IP: %s' % str(address)
449 # We do the certificate handling here, as M2Crypto keeps segfaulting when we do it in a method
451 if os.path.isfile(args.ca_cert):
452 if ctx.load_verify_locations(cafile=args.ca_cert) != 1: raise Exception('No CA cert')
453 elif os.path.exists(args.ca_cert):
454 if ctx.load_verify_locations(capath=args.ca_cert) != 1: raise Exception('No CA certs')
456 print >> sys.stderr, '%s is neither a file nor a directory, unable to continue' % args.ca_cert
458 # Don't error when the verification fails in the SSL handshake
459 ctx.set_verify(SSL.verify_none, depth=9)
460 if isinstance(address, AAAARecord):
461 sock = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
462 sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
465 connection = SSL.Connection(ctx, sock=sock)
467 connection.connect((str(address), int(args.port)))
468 except SSL.Checker.WrongHost, e:
469 # The name on the remote cert doesn't match the hostname because we connect on IP, not hostname (as we want secure lookup)
471 chain = connection.get_peer_cert_chain()
472 verify_result = connection.get_verify_result()
474 # Good, now let's verify
475 if record.usage == 1: # End-host cert
477 if verifyCertMatch(record, cert):
478 if verify_result == 0: # The cert chains to a valid CA cert according to the system-certificates
479 print 'SUCCESS (Usage 1): Certificate offered by the server matches the one mentioned in the TLSA record and chains to a valid CA certificate'
481 print 'FAIL (Usage 1): Certificate offered by the server matches the one mentioned in the TLSA record but the following error was raised during PKIX validation: %s' % getVerificationErrorReason(verify_result)
482 if pre_exit == 0: pre_exit = 2
483 if not args.quiet: print 'The matched certificate has Subject: %s' % cert.get_subject()
485 print 'FAIL: Certificate offered by the server does not match the TLSA record'
486 if pre_exit == 0: pre_exit = 2
488 elif record.usage == 0: # CA constraint
490 # Remove the first (= End-Entity cert) from the chain
493 if verifyCertMatch(record, cert):
498 if verify_result == 0:
499 print 'SUCCESS (Usage 0): A certificate in the certificate chain offered by the server matches the one mentioned in the TLSA record and is a CA certificate'
501 print 'FAIL (Usage 0): A certificate in the certificate chain offered by the server matches the one mentioned in the TLSA record and is a CA certificate, but the following error was raised during PKIX validation:' % getVerificationErrorReason(verify_result)
502 if pre_exit == 0: pre_exit = 2
504 print 'FAIL (Usage 0): A certificate in the certificate chain offered by the server matches the one mentioned in the TLSA record but is not a CA certificate'
505 if pre_exit == 0: pre_exit = 2
506 if not args.quiet: print 'The matched certificate has Subject: %s' % cert.get_subject()
508 print 'FAIL (Usage 0): No certificate in the certificate chain offered by the server matches the TLSA record'
509 if pre_exit == 0: pre_exit = 2
511 elif record.usage == 2: # Usage 2, use the cert in the record as trust anchor
512 #FIXME: doesnt comply to the spec
514 previous_issuer = None
517 if not str(previous_issuer) == str(cert.get_subject()): # The chain cannot be valid
518 print "FAIL: Certificates don't chain"
520 previous_issuer = cert.get_issuer()
521 if verifyCertMatch(record, cert):
525 print 'SUCCESS (usage 2): A certificate in the certificate chain (including the end-entity certificate) offered by the server matches the TLSA record'
526 if not args.quiet: print 'The matched certificate has Subject: %s' % cert.get_subject()
528 print 'FAIL (usage 2): No certificate in the certificate chain (including the end-entity certificate) offered by the server matches the TLSA record'
529 if pre_exit == 0: pre_exit = 2
531 elif record.usage == 3: # EE cert MUST match
532 if verifyCertMatch(record,chain[0]):
533 print 'SUCCESS (usage 3): The certificate offered by the server matches the TLSA record'
534 if not args.quiet: print 'The matched certificate has Subject: %s' % chain[0].get_subject()
536 print 'FAIL (usage 3): The certificate offered by the server does not match the TLSA record'
537 if pre_exit == 0: pre_exit = 2
539 # Cleanup, just in case
544 # END for address in addresses
545 # END for record in records
549 else: # we want to create
551 if not args.certificate:
552 if args.protocol != 'tcp':
553 print >> sys.stderr, 'Only SSL over TCP is supported (sorry)'
556 print 'No certificate specified on the commandline, attempting to retrieve it from the server %s' % (args.host)
557 connection_port = args.port
559 sys.stdout.write('The port specified on the commandline is *, please specify the port of the TLS service on %s (443): ' % args.host)
562 user_input = raw_input()
564 connection_port = 443
567 if 1 <= int(user_input) <= 65535:
568 connection_port = user_input
571 sys.stdout.write('Port %s not numerical or within correct range (1 <= port <= 65535), try again (hit enter for default 443): ' % user_input)
572 # Get the A records for the host
574 addresses = getA(args.host, secure=secure) + getAAAA(args.host, secure=secure)
575 except InsecureLookupException, e:
576 print >> sys.stderr, str(e)
579 for address in addresses:
580 print 'Attempting to get certificate from %s' % str(address)
581 # We do the certificate handling here, as M2Crypto keeps segfaulting when try to do stuff with the cert if we don't
583 ctx.set_verify(SSL.verify_none, depth=9)
584 if isinstance(address, AAAARecord):
585 sock = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
586 sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
589 connection = SSL.Connection(ctx, sock=sock)
591 connection.connect((str(address), int(connection_port)))
592 except SSL.Checker.WrongHost:
595 chain = connection.get_peer_cert_chain()
596 for chaincert in chain:
597 if int(args.usage) == 1 or int(args.usage) == 3:
598 # The first cert is the end-entity cert
599 print 'Got a certificate with Subject: %s' % chaincert.get_subject()
603 if (int(args.usage) == 0 and chaincert.check_ca()) or int(args.usage) == 2:
604 sys.stdout.write('Got a certificate with the following Subject:\n\t%s\nUse this as certificate to match? [y/N] ' % chaincert.get_subject())
607 user_input = raw_input()
608 if user_input in ['','n','N']:
610 elif user_input in ['y', 'Y']:
614 sys.stdout.write('Please answer Y or N')
618 if cert: # Print the requested records based on the retrieved certificates
619 if args.output == 'both':
620 print genTLSA(args.host, args.protocol, args.port, cert, 'draft', args.usage, args.selector, args.mtype)
621 print genTLSA(args.host, args.protocol, args.port, cert, 'rfc', args.usage, args.selector, args.mtype)
623 print genTLSA(args.host, args.protocol, args.port, cert, args.output, args.usage, args.selector, args.mtype)
625 # Clear the cert from memory (to stop M2Crypto from segfaulting)
626 # And cleanup the connection and context
632 else: # Pass the path to the certificate to the genTLSA function
633 if args.output == 'both':
634 print genTLSA(args.host, args.protocol, args.port, args.certificate, 'draft', args.usage, args.selector, args.mtype)
635 print genTLSA(args.host, args.protocol, args.port, args.certificate, 'rfc', args.usage, args.selector, args.mtype)
637 print genTLSA(args.host, args.protocol, args.port, args.certificate, args.output, args.usage, args.selector, args.mtype)