Hello,
The other day, we had a Scrapy user report an issue connecting to
https://www.skelbiu.lt/ with OpenSSL 1.1 [1]
To not mix scrapy's things with Twisted Web, I used this (adapted from
official docs):
#---------------
from __future__ import print_function
from twisted.internet import reactor
from twisted.web.client import Agent
from twisted.web.http_headers import Headers
agent = Agent(reactor)
d = agent.request(
'GET',
'https://www.skelbiu.lt/',
Headers({'User-Agent': ['Twisted Web Client Example']}),
None)
def cbResponse(ignored):
print('Response received')
d.addCallback(cbResponse)
def cbShutdown(ignored):
print(ignored)
reactor.stop()
d.addBoth(cbShutdown)
reactor.run()
#---------------
And I did get a Handshake failure too:
$ python twistedtest.py
[Failure instance: Traceback (failure with no frames): <class
'twisted.web._newclient.ResponseNeverReceived'>:
[<twisted.python.failure.Failure OpenSSL.SSL.Error: [('SSL routines',
'ssl3_read_bytes', 'sslv3 alert handshake failure')]>]
]
It seems this happens (at least) with OpenSSL 1.1.0e (currently in Debian 9
sid [2])
It does not happen (for me) with OpenSSL 1.0.2g for example.
I dug into this this afternoon and narrowed it down to the use of
_defaultCurveName = u"prime256v1"
in twisted.internet._sslverify.py
I tried patching the current trunk with _defaultCurveName = u"secp384r1"
(the EC that ssllabs.com reports)
and it did work.
Looking at ClientHello messages for openssl 1.0.2 and 1.1 [4]:
with 1.1, only 1 Elliptic Curve is sent by Twisted Web Agent, secp256r1
openssl v1.1 client uses 4 by default: ecdh_x25519, secp256r1, secp521r1,
secp384r1
I was wondering what is the proper way to configure requested Elliptic
Curves.
I haven't seen any interface for this, contrary to ciphers with
acceptableCiphers.
Thank you for your input.
Best,
Paul.
[1] https://github.com/scrapy/scrapy/issues/2717
[2] https://packages.debian.org/fr/source/sid/openssl
[3]
https://github.com/twisted/twisted/blob/78679af87e349721a167f35bef239e192e9…
[4] https://github.com/scrapy/scrapy/issues/2717#issuecomment-297464034
# This code doesn't call getChild in python3, but it does in python2
(python2 throws AttributeError, but python3 doesn't) with "curl
http://127.0.0.1:8803/bug/a" and Twisted==19.7.0 with python3.5.2:
from twisted.application import internet, service, strports
from twisted.web.resource import Resource
from twisted.web.server import Site
from twisted.internet import reactor
from twisted.python import log
from twisted.web.resource import Resource
class R(Resource):
allowedMethods=('GET',)
def getChild(self, name, request):
pass
r = Resource()
r.putChild('bug', R())
application = service.Application('web')
site = Site(r)
sc = service.IServiceCollection(application)
i = strports.service("tcp:8803", site)
i.setServiceParent(sc)
