/usr/lib/python3/dist-packages/twisted/internet/_sslverify.py is in python3-twisted-experimental 13.2.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 | # -*- test-case-name: twisted.test.test_sslverify -*-
# Copyright (c) 2005 Divmod, Inc.
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
from __future__ import division, absolute_import
import itertools
from hashlib import md5
from OpenSSL import SSL, crypto
from twisted.python.compat import nativeString, networkString
from twisted.python import _reflectpy3 as reflect, util
from twisted.internet.defer import Deferred
from twisted.internet.error import VerifyError, CertificateError
def _sessionCounter(counter=itertools.count()):
"""
Private - shared between all OpenSSLCertificateOptions, counts up to
provide a unique session id for each context.
"""
return next(counter)
_x509names = {
'CN': 'commonName',
'commonName': 'commonName',
'O': 'organizationName',
'organizationName': 'organizationName',
'OU': 'organizationalUnitName',
'organizationalUnitName': 'organizationalUnitName',
'L': 'localityName',
'localityName': 'localityName',
'ST': 'stateOrProvinceName',
'stateOrProvinceName': 'stateOrProvinceName',
'C': 'countryName',
'countryName': 'countryName',
'emailAddress': 'emailAddress'}
class DistinguishedName(dict):
"""
Identify and describe an entity.
Distinguished names are used to provide a minimal amount of identifying
information about a certificate issuer or subject. They are commonly
created with one or more of the following fields::
commonName (CN)
organizationName (O)
organizationalUnitName (OU)
localityName (L)
stateOrProvinceName (ST)
countryName (C)
emailAddress
A L{DistinguishedName} should be constructed using keyword arguments whose
keys can be any of the field names above (as a native string), and the
values are either Unicode text which is encodable to ASCII, or C{bytes}
limited to the ASCII subset. Any fields passed to the constructor will be
set as attributes, accessable using both their extended name and their
shortened acronym. The attribute values will be the ASCII-encoded
bytes. For example::
>>> dn = DistinguishedName(commonName=b'www.example.com',
C='US')
>>> dn.C
b'US'
>>> dn.countryName
b'US'
>>> hasattr(dn, "organizationName")
False
L{DistinguishedName} instances can also be used as dictionaries; the keys
are extended name of the fields::
>>> dn.keys()
['countryName', 'commonName']
>>> dn['countryName']
b'US'
"""
__slots__ = ()
def __init__(self, **kw):
for k, v in kw.items():
setattr(self, k, v)
def _copyFrom(self, x509name):
for name in _x509names:
value = getattr(x509name, name, None)
if value is not None:
setattr(self, name, value)
def _copyInto(self, x509name):
for k, v in self.items():
setattr(x509name, k, nativeString(v))
def __repr__(self):
return '<DN %s>' % (dict.__repr__(self)[1:-1])
def __getattr__(self, attr):
try:
return self[_x509names[attr]]
except KeyError:
raise AttributeError(attr)
def __setattr__(self, attr, value):
if attr not in _x509names:
raise AttributeError("%s is not a valid OpenSSL X509 name field" % (attr,))
realAttr = _x509names[attr]
if not isinstance(value, bytes):
value = value.encode("ascii")
self[realAttr] = value
def inspect(self):
"""
Return a multi-line, human-readable representation of this DN.
@rtype: C{str}
"""
l = []
lablen = 0
def uniqueValues(mapping):
return set(mapping.values())
for k in sorted(uniqueValues(_x509names)):
label = util.nameToLabel(k)
lablen = max(len(label), lablen)
v = getattr(self, k, None)
if v is not None:
l.append((label, nativeString(v)))
lablen += 2
for n, (label, attr) in enumerate(l):
l[n] = (label.rjust(lablen)+': '+ attr)
return '\n'.join(l)
DN = DistinguishedName
class CertBase:
def __init__(self, original):
self.original = original
def _copyName(self, suffix):
dn = DistinguishedName()
dn._copyFrom(getattr(self.original, 'get_'+suffix)())
return dn
def getSubject(self):
"""
Retrieve the subject of this certificate.
@rtype: L{DistinguishedName}
@return: A copy of the subject of this certificate.
"""
return self._copyName('subject')
def _handleattrhelper(Class, transport, methodName):
"""
(private) Helper for L{Certificate.peerFromTransport} and
L{Certificate.hostFromTransport} which checks for incompatible handle types
and null certificates and raises the appropriate exception or returns the
appropriate certificate object.
"""
method = getattr(transport.getHandle(),
"get_%s_certificate" % (methodName,), None)
if method is None:
raise CertificateError(
"non-TLS transport %r did not have %s certificate" % (transport, methodName))
cert = method()
if cert is None:
raise CertificateError(
"TLS transport %r did not have %s certificate" % (transport, methodName))
return Class(cert)
class Certificate(CertBase):
"""
An x509 certificate.
"""
def __repr__(self):
return '<%s Subject=%s Issuer=%s>' % (self.__class__.__name__,
self.getSubject().commonName,
self.getIssuer().commonName)
def __eq__(self, other):
if isinstance(other, Certificate):
return self.dump() == other.dump()
return False
def __ne__(self, other):
return not self.__eq__(other)
def load(Class, requestData, format=crypto.FILETYPE_ASN1, args=()):
"""
Load a certificate from an ASN.1- or PEM-format string.
@rtype: C{Class}
"""
return Class(crypto.load_certificate(format, requestData), *args)
load = classmethod(load)
_load = load
def dumpPEM(self):
"""
Dump this certificate to a PEM-format data string.
@rtype: C{str}
"""
return self.dump(crypto.FILETYPE_PEM)
def loadPEM(Class, data):
"""
Load a certificate from a PEM-format data string.
@rtype: C{Class}
"""
return Class.load(data, crypto.FILETYPE_PEM)
loadPEM = classmethod(loadPEM)
def peerFromTransport(Class, transport):
"""
Get the certificate for the remote end of the given transport.
@type: L{ISystemHandle}
@rtype: C{Class}
@raise: L{CertificateError}, if the given transport does not have a peer
certificate.
"""
return _handleattrhelper(Class, transport, 'peer')
peerFromTransport = classmethod(peerFromTransport)
def hostFromTransport(Class, transport):
"""
Get the certificate for the local end of the given transport.
@param transport: an L{ISystemHandle} provider; the transport we will
@rtype: C{Class}
@raise: L{CertificateError}, if the given transport does not have a host
certificate.
"""
return _handleattrhelper(Class, transport, 'host')
hostFromTransport = classmethod(hostFromTransport)
def getPublicKey(self):
"""
Get the public key for this certificate.
@rtype: L{PublicKey}
"""
return PublicKey(self.original.get_pubkey())
def dump(self, format=crypto.FILETYPE_ASN1):
return crypto.dump_certificate(format, self.original)
def serialNumber(self):
"""
Retrieve the serial number of this certificate.
@rtype: C{int}
"""
return self.original.get_serial_number()
def digest(self, method='md5'):
"""
Return a digest hash of this certificate using the specified hash
algorithm.
@param method: One of C{'md5'} or C{'sha'}.
@rtype: C{str}
"""
return self.original.digest(method)
def _inspect(self):
return '\n'.join(['Certificate For Subject:',
self.getSubject().inspect(),
'\nIssuer:',
self.getIssuer().inspect(),
'\nSerial Number: %d' % self.serialNumber(),
'Digest: %s' % nativeString(self.digest())])
def inspect(self):
"""
Return a multi-line, human-readable representation of this
Certificate, including information about the subject, issuer, and
public key.
"""
return '\n'.join((self._inspect(), self.getPublicKey().inspect()))
def getIssuer(self):
"""
Retrieve the issuer of this certificate.
@rtype: L{DistinguishedName}
@return: A copy of the issuer of this certificate.
"""
return self._copyName('issuer')
def options(self, *authorities):
raise NotImplementedError('Possible, but doubtful we need this yet')
class CertificateRequest(CertBase):
"""
An x509 certificate request.
Certificate requests are given to certificate authorities to be signed and
returned resulting in an actual certificate.
"""
def load(Class, requestData, requestFormat=crypto.FILETYPE_ASN1):
req = crypto.load_certificate_request(requestFormat, requestData)
dn = DistinguishedName()
dn._copyFrom(req.get_subject())
if not req.verify(req.get_pubkey()):
raise VerifyError("Can't verify that request for %r is self-signed." % (dn,))
return Class(req)
load = classmethod(load)
def dump(self, format=crypto.FILETYPE_ASN1):
return crypto.dump_certificate_request(format, self.original)
class PrivateCertificate(Certificate):
"""
An x509 certificate and private key.
"""
def __repr__(self):
return Certificate.__repr__(self) + ' with ' + repr(self.privateKey)
def _setPrivateKey(self, privateKey):
if not privateKey.matches(self.getPublicKey()):
raise VerifyError(
"Certificate public and private keys do not match.")
self.privateKey = privateKey
return self
def newCertificate(self, newCertData, format=crypto.FILETYPE_ASN1):
"""
Create a new L{PrivateCertificate} from the given certificate data and
this instance's private key.
"""
return self.load(newCertData, self.privateKey, format)
def load(Class, data, privateKey, format=crypto.FILETYPE_ASN1):
return Class._load(data, format)._setPrivateKey(privateKey)
load = classmethod(load)
def inspect(self):
return '\n'.join([Certificate._inspect(self),
self.privateKey.inspect()])
def dumpPEM(self):
"""
Dump both public and private parts of a private certificate to
PEM-format data.
"""
return self.dump(crypto.FILETYPE_PEM) + self.privateKey.dump(crypto.FILETYPE_PEM)
def loadPEM(Class, data):
"""
Load both private and public parts of a private certificate from a
chunk of PEM-format data.
"""
return Class.load(data, KeyPair.load(data, crypto.FILETYPE_PEM),
crypto.FILETYPE_PEM)
loadPEM = classmethod(loadPEM)
def fromCertificateAndKeyPair(Class, certificateInstance, privateKey):
privcert = Class(certificateInstance.original)
return privcert._setPrivateKey(privateKey)
fromCertificateAndKeyPair = classmethod(fromCertificateAndKeyPair)
def options(self, *authorities):
options = dict(privateKey=self.privateKey.original,
certificate=self.original)
if authorities:
options.update(dict(verify=True,
requireCertificate=True,
caCerts=[auth.original for auth in authorities]))
return OpenSSLCertificateOptions(**options)
def certificateRequest(self, format=crypto.FILETYPE_ASN1,
digestAlgorithm='md5'):
return self.privateKey.certificateRequest(
self.getSubject(),
format,
digestAlgorithm)
def signCertificateRequest(self,
requestData,
verifyDNCallback,
serialNumber,
requestFormat=crypto.FILETYPE_ASN1,
certificateFormat=crypto.FILETYPE_ASN1):
issuer = self.getSubject()
return self.privateKey.signCertificateRequest(
issuer,
requestData,
verifyDNCallback,
serialNumber,
requestFormat,
certificateFormat)
def signRequestObject(self, certificateRequest, serialNumber,
secondsToExpiry=60 * 60 * 24 * 365, # One year
digestAlgorithm='md5'):
return self.privateKey.signRequestObject(self.getSubject(),
certificateRequest,
serialNumber,
secondsToExpiry,
digestAlgorithm)
class PublicKey:
def __init__(self, osslpkey):
self.original = osslpkey
req1 = crypto.X509Req()
req1.set_pubkey(osslpkey)
self._emptyReq = crypto.dump_certificate_request(crypto.FILETYPE_ASN1, req1)
def matches(self, otherKey):
return self._emptyReq == otherKey._emptyReq
# XXX This could be a useful method, but sometimes it triggers a segfault,
# so we'll steer clear for now.
# def verifyCertificate(self, certificate):
# """
# returns None, or raises a VerifyError exception if the certificate
# could not be verified.
# """
# if not certificate.original.verify(self.original):
# raise VerifyError("We didn't sign that certificate.")
def __repr__(self):
return '<%s %s>' % (self.__class__.__name__, self.keyHash())
def keyHash(self):
"""
MD5 hex digest of signature on an empty certificate request with this
key.
"""
return md5(self._emptyReq).hexdigest()
def inspect(self):
return 'Public Key with Hash: %s' % (self.keyHash(),)
class KeyPair(PublicKey):
def load(Class, data, format=crypto.FILETYPE_ASN1):
return Class(crypto.load_privatekey(format, data))
load = classmethod(load)
def dump(self, format=crypto.FILETYPE_ASN1):
return crypto.dump_privatekey(format, self.original)
def __getstate__(self):
return self.dump()
def __setstate__(self, state):
self.__init__(crypto.load_privatekey(crypto.FILETYPE_ASN1, state))
def inspect(self):
t = self.original.type()
if t == crypto.TYPE_RSA:
ts = 'RSA'
elif t == crypto.TYPE_DSA:
ts = 'DSA'
else:
ts = '(Unknown Type!)'
L = (self.original.bits(), ts, self.keyHash())
return '%s-bit %s Key Pair with Hash: %s' % L
def generate(Class, kind=crypto.TYPE_RSA, size=1024):
pkey = crypto.PKey()
pkey.generate_key(kind, size)
return Class(pkey)
def newCertificate(self, newCertData, format=crypto.FILETYPE_ASN1):
return PrivateCertificate.load(newCertData, self, format)
generate = classmethod(generate)
def requestObject(self, distinguishedName, digestAlgorithm='md5'):
req = crypto.X509Req()
req.set_pubkey(self.original)
distinguishedName._copyInto(req.get_subject())
req.sign(self.original, digestAlgorithm)
return CertificateRequest(req)
def certificateRequest(self, distinguishedName,
format=crypto.FILETYPE_ASN1,
digestAlgorithm='md5'):
"""Create a certificate request signed with this key.
@return: a string, formatted according to the 'format' argument.
"""
return self.requestObject(distinguishedName, digestAlgorithm).dump(format)
def signCertificateRequest(self,
issuerDistinguishedName,
requestData,
verifyDNCallback,
serialNumber,
requestFormat=crypto.FILETYPE_ASN1,
certificateFormat=crypto.FILETYPE_ASN1,
secondsToExpiry=60 * 60 * 24 * 365, # One year
digestAlgorithm='md5'):
"""
Given a blob of certificate request data and a certificate authority's
DistinguishedName, return a blob of signed certificate data.
If verifyDNCallback returns a Deferred, I will return a Deferred which
fires the data when that Deferred has completed.
"""
hlreq = CertificateRequest.load(requestData, requestFormat)
dn = hlreq.getSubject()
vval = verifyDNCallback(dn)
def verified(value):
if not value:
raise VerifyError("DN callback %r rejected request DN %r" % (verifyDNCallback, dn))
return self.signRequestObject(issuerDistinguishedName, hlreq,
serialNumber, secondsToExpiry, digestAlgorithm).dump(certificateFormat)
if isinstance(vval, Deferred):
return vval.addCallback(verified)
else:
return verified(vval)
def signRequestObject(self,
issuerDistinguishedName,
requestObject,
serialNumber,
secondsToExpiry=60 * 60 * 24 * 365, # One year
digestAlgorithm='md5'):
"""
Sign a CertificateRequest instance, returning a Certificate instance.
"""
req = requestObject.original
cert = crypto.X509()
issuerDistinguishedName._copyInto(cert.get_issuer())
cert.set_subject(req.get_subject())
cert.set_pubkey(req.get_pubkey())
cert.gmtime_adj_notBefore(0)
cert.gmtime_adj_notAfter(secondsToExpiry)
cert.set_serial_number(serialNumber)
cert.sign(self.original, digestAlgorithm)
return Certificate(cert)
def selfSignedCert(self, serialNumber, **kw):
dn = DN(**kw)
return PrivateCertificate.fromCertificateAndKeyPair(
self.signRequestObject(dn, self.requestObject(dn), serialNumber),
self)
class OpenSSLCertificateOptions(object):
"""
A factory for SSL context objects for both SSL servers and clients.
"""
# Factory for creating contexts. Configurable for testability.
_contextFactory = SSL.Context
_context = None
# Older versions of PyOpenSSL didn't provide OP_ALL. Fudge it here, just in case.
_OP_ALL = getattr(SSL, 'OP_ALL', 0x0000FFFF)
# OP_NO_TICKET is not (yet) exposed by PyOpenSSL
_OP_NO_TICKET = 0x00004000
method = SSL.TLSv1_METHOD
def __init__(self,
privateKey=None,
certificate=None,
method=None,
verify=False,
caCerts=None,
verifyDepth=9,
requireCertificate=True,
verifyOnce=True,
enableSingleUseKeys=True,
enableSessions=True,
fixBrokenPeers=False,
enableSessionTickets=False,
extraCertChain=None):
"""
Create an OpenSSL context SSL connection context factory.
@param privateKey: A PKey object holding the private key.
@param certificate: An X509 object holding the certificate.
@param method: The SSL protocol to use, one of SSLv23_METHOD,
SSLv2_METHOD, SSLv3_METHOD, TLSv1_METHOD. Defaults to TLSv1_METHOD.
@param verify: If C{True}, verify certificates received from the peer
and fail the handshake if verification fails. Otherwise, allow
anonymous sessions and sessions with certificates which fail
validation. By default this is C{False}.
@param caCerts: List of certificate authority certificate objects to
use to verify the peer's certificate. Only used if verify is
C{True} and will be ignored otherwise. Since verify is C{False} by
default, this is C{None} by default.
@type caCerts: C{list} of L{OpenSSL.crypto.X509}
@param verifyDepth: Depth in certificate chain down to which to verify.
If unspecified, use the underlying default (9).
@param requireCertificate: If True, do not allow anonymous sessions.
@param verifyOnce: If True, do not re-verify the certificate
on session resumption.
@param enableSingleUseKeys: If True, generate a new key whenever
ephemeral DH parameters are used to prevent small subgroup attacks.
@param enableSessions: If True, set a session ID on each context. This
allows a shortened handshake to be used when a known client reconnects.
@param fixBrokenPeers: If True, enable various non-spec protocol fixes
for broken SSL implementations. This should be entirely safe,
according to the OpenSSL documentation, but YMMV. This option is now
off by default, because it causes problems with connections between
peers using OpenSSL 0.9.8a.
@param enableSessionTickets: If True, enable session ticket extension
for session resumption per RFC 5077. Note there is no support for
controlling session tickets. This option is off by default, as some
server implementations don't correctly process incoming empty session
ticket extensions in the hello.
@param extraCertChain: List of certificates that I{complete} your
verification chain if the certificate authority that signed your
C{certificate} isn't widely supported. Do I{not} add
C{certificate} to it.
@type extraCertChain: C{list} of L{OpenSSL.crypto.X509}
"""
if (privateKey is None) != (certificate is None):
raise ValueError(
"Specify neither or both of privateKey and certificate")
self.privateKey = privateKey
self.certificate = certificate
if method is not None:
self.method = method
if verify and not caCerts:
raise ValueError("Specify client CA certificate information if and"
" only if enabling certificate verification")
self.verify = verify
if extraCertChain is not None and None in (privateKey, certificate):
raise ValueError("A private key and a certificate are required "
"when adding a supplemental certificate chain.")
if extraCertChain is not None:
self.extraCertChain = extraCertChain
else:
self.extraCertChain = []
self.caCerts = caCerts
self.verifyDepth = verifyDepth
self.requireCertificate = requireCertificate
self.verifyOnce = verifyOnce
self.enableSingleUseKeys = enableSingleUseKeys
self.enableSessions = enableSessions
self.fixBrokenPeers = fixBrokenPeers
self.enableSessionTickets = enableSessionTickets
def __getstate__(self):
d = self.__dict__.copy()
try:
del d['_context']
except KeyError:
pass
return d
def __setstate__(self, state):
self.__dict__ = state
def getContext(self):
"""Return a SSL.Context object.
"""
if self._context is None:
self._context = self._makeContext()
return self._context
def _makeContext(self):
ctx = self._contextFactory(self.method)
# Disallow insecure SSLv2. Applies only for SSLv23_METHOD.
ctx.set_options(SSL.OP_NO_SSLv2)
if self.certificate is not None and self.privateKey is not None:
ctx.use_certificate(self.certificate)
ctx.use_privatekey(self.privateKey)
for extraCert in self.extraCertChain:
ctx.add_extra_chain_cert(extraCert)
# Sanity check
ctx.check_privatekey()
verifyFlags = SSL.VERIFY_NONE
if self.verify:
verifyFlags = SSL.VERIFY_PEER
if self.requireCertificate:
verifyFlags |= SSL.VERIFY_FAIL_IF_NO_PEER_CERT
if self.verifyOnce:
verifyFlags |= SSL.VERIFY_CLIENT_ONCE
if self.caCerts:
store = ctx.get_cert_store()
for cert in self.caCerts:
store.add_cert(cert)
# It'd be nice if pyOpenSSL let us pass None here for this behavior (as
# the underlying OpenSSL API call allows NULL to be passed). It
# doesn't, so we'll supply a function which does the same thing.
def _verifyCallback(conn, cert, errno, depth, preverify_ok):
return preverify_ok
ctx.set_verify(verifyFlags, _verifyCallback)
if self.verifyDepth is not None:
ctx.set_verify_depth(self.verifyDepth)
if self.enableSingleUseKeys:
ctx.set_options(SSL.OP_SINGLE_DH_USE)
if self.fixBrokenPeers:
ctx.set_options(self._OP_ALL)
if self.enableSessions:
name = "%s-%d" % (reflect.qual(self.__class__), _sessionCounter())
sessionName = md5(networkString(name)).hexdigest()
ctx.set_session_id(sessionName)
if not self.enableSessionTickets:
ctx.set_options(self._OP_NO_TICKET)
return ctx
|