[utils] make_HTTPS_handler: Don't clear options with openssl < 0.9.8m (fixes #4294)
It raises a ValueError exception, see https://docs.python.org/2/library/ssl.html#ssl.SSLContext.options
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@ -390,6 +390,8 @@ def formatSeconds(secs):
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def make_HTTPS_handler(opts_no_check_certificate, **kwargs):
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if hasattr(ssl, 'create_default_context'): # Python >= 3.4 or 2.7.9
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context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)
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# options can only be cleared with openssl >= 0.9.8m
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if ssl.OPENSSL_VERSION_INFO >= (0, 9, 8, 13, 15):
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context.options &= ~ssl.OP_NO_SSLv3 # Allow older, not-as-secure SSLv3
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if opts_no_check_certificate:
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context.verify_mode = ssl.CERT_NONE
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