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startTLS: enable Diffie-Hellman based key exchange on server

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Following the guidelines reported in the Twisted documentation
here https://twistedmatrix.com/documents/current/core/howto/ssl.html
this commit enables Diffie-Hellman based key exchange on the server.

Before launching the server, a parameters .pem file must be generated
as detailed in https://twistedmatrix.com/documents/18.9.0/api/twisted.internet.ssl.DiffieHellmanParameters.html
by running `openssl dhparam -out dh_param_1024.pem -2 1024`
on the server machine. This parameters file must be placed in the same
path that contains the server certificates.
This commit is contained in:
Alberto Sottile 2019-02-07 15:34:43 +01:00
parent 810a791332
commit 70feed3305
1 changed files with 6 additions and 1 deletions
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7
syncplay/server.py
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@ -13,6 +13,7 @@ from twisted.internet.protocol import Factory
try:
from OpenSSL import crypto
from twisted.internet import ssl
from twisted.python.filepath import FilePath
except:
pass
@ -213,8 +214,12 @@ class SyncFactory(Factory):
certifpyssl = crypto.load_certificate(crypto.FILETYPE_PEM, certif)
chainpyssl = [crypto.load_certificate(crypto.FILETYPE_PEM, chain)]
dhFilePath = FilePath(path+'/dh_param_1024.pem')
dhParams = ssl.DiffieHellmanParameters.fromFile(dhFilePath)
contextFactory = ssl.CertificateOptions(privateKey=privkeypyssl, certificate=certifpyssl,
extraCertChain=chainpyssl, raiseMinimumTo=ssl.TLSVersion.TLSv1_2)
extraCertChain=chainpyssl, dhParameters=dhParams,
raiseMinimumTo=ssl.TLSVersion.TLSv1_2)
self.options = contextFactory
except Exception as e:
print(e)