I am using MacOS ventura and pycharm and trying to establish a connection between a twisted server/client with tls following this guide: TLS server with client authentication via client certificate verification Therefore i created a self signed certificate like in this example with:
openssl req -x509 -newkey rsa:4096 -days 365 -nodes -keyout ca-key.pem -out ca-cert.pem -subj "/C=/ST=/L=/O=/OU=/CN=*." openssl req -newkey rsa:4096 -nodes -keyout server-key.pem -out server-req.pem -subj "/C=/ST=/L=/O=/OU=/CN=*." openssl x509 -req -in server-req.pem -days 60 -CA ca-cert.pem -CAkey ca-key.pem -CAcreateserial -out server-cert.pem -extfile server-ext.cnf server-ext.cnf contains: subjectAltName=DNS:*.example.comIP:0.0.0.0
openssl verify -CAfile ca-cert.pem server-cert.pem returns OK
I merged server-key.pem and server-cert.pem in server.pem and renamed server-cert.pem in public.pem
running this for the server
\#!/usr/bin/env python # Copyright (c) Twisted Matrix Laboratories. # See LICENSE for details. import sys from twisted.internet import ssl, protocol, task, defer from twisted.python import log from twisted.python.modules import getModule import echoserv def main(reactor): log.startLogging(sys.stdout) certData = getModule(__name__).filePath.sibling('public.pem').getContent() authData = getModule(__name__).filePath.sibling('server.pem').getContent() authority = ssl.Certificate.loadPEM(certData) certificate = ssl.PrivateCertificate.loadPEM(authData) factory = protocol.Factory.forProtocol(echoserv.Echo) reactor.listenSSL(8000, factory, certificate.options(authority)) return defer.Deferred() if __name__ == '__main__': import ssl_clientauth_server task.react(ssl_clientauth_server.main) and that for the client side
#!/usr/bin/env python # Copyright (c) Twisted Matrix Laboratories. # See LICENSE for details. from twisted.internet import ssl, task, protocol, endpoints, defer from twisted.python.modules import getModule import echoclient @defer.inlineCallbacks def main(reactor): factory = protocol.Factory.forProtocol(echoclient.EchoClient) certData = getModule(__name__).filePath.sibling('public.pem').getContent() authData = getModule(__name__).filePath.sibling('server.pem').getContent() clientCertificate = ssl.PrivateCertificate.loadPEM(authData) authority = ssl.Certificate.loadPEM(certData) options = ssl.optionsForClientTLS(u'example.com', authority, clientCertificate) endpoint = endpoints.SSL4ClientEndpoint(reactor, 'localhost', 8000, options) echoClient = yield endpoint.connect(factory) done = defer.Deferred() # echoClient.connectionLost = lambda reason: done.callback(None) echoClient.connectionLost = lambda reason: done.callback(reason) yield done if __name__ == '__main__': import ssl_clientauth_client task.react(ssl_clientauth_client.main) the server code is working, but the client code raises an error: OpenSSL.SSL.Error: [('SSL routines', '', 'certificate verify failed')]
I tried the steps in this Answer, installed openssl via homebrew, certifi, did export SSL_CERT_FILE="$(python -m certifi)", installed service-identity but nothing helped so far.
I am expecting a connection between server and client using TLS. How to fix this?
1 Answer
after recreating the key/certificate with:
openssl req \ -newkey rsa:2048 -nodes -keyout domain.key \ -x509 -days 365 -out domain.crt the error: OpenSSL.SSL.Error: [('SSL routines', '', 'certificate verify failed')] disappears.
