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Backport SSL configuration from Python 3.10 (#5437)
Partial fix for https://github.com/yt-dlp/yt-dlp/pull/5294#issuecomment-1289363572, https://github.com/yt-dlp/yt-dlp/issues/4627 Authored by: coletdjnz
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@ -985,6 +985,18 @@ def make_HTTPS_handler(params, **kwargs):
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context.options |= 4 # SSL_OP_LEGACY_SERVER_CONNECT
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# Allow use of weaker ciphers in Python 3.10+. See https://bugs.python.org/issue43998
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context.set_ciphers('DEFAULT')
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elif sys.version_info < (3, 10) and ssl.OPENSSL_VERSION_INFO >= (1, 1, 1):
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# Backport the default SSL ciphers and minimum TLS version settings from Python 3.10 [1].
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# This is to ensure consistent behavior across Python versions, and help avoid fingerprinting
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# in some situations [2][3].
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# Python 3.10 only supports OpenSSL 1.1.1+ [4]. Because this change is likely
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# untested on older versions, we only apply this to OpenSSL 1.1.1+ to be safe.
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# 1. https://github.com/python/cpython/commit/e983252b516edb15d4338b0a47631b59ef1e2536
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# 2. https://github.com/yt-dlp/yt-dlp/issues/4627
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# 3. https://github.com/yt-dlp/yt-dlp/pull/5294
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# 4. https://peps.python.org/pep-0644/
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context.set_ciphers('@SECLEVEL=2:ECDH+AESGCM:ECDH+CHACHA20:ECDH+AES:DHE+AES:!aNULL:!eNULL:!aDSS:!SHA1:!AESCCM')
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context.minimum_version = ssl.TLSVersion.TLSv1_2
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context.verify_mode = ssl.CERT_REQUIRED if opts_check_certificate else ssl.CERT_NONE
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if opts_check_certificate:
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@ -1982,12 +1994,13 @@ def system_identifier():
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with contextlib.suppress(OSError): # We may not have access to the executable
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libc_ver = platform.libc_ver()
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return 'Python %s (%s %s) - %s %s' % (
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return 'Python %s (%s %s) - %s (%s%s)' % (
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platform.python_version(),
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python_implementation,
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platform.architecture()[0],
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platform.platform(),
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format_field(join_nonempty(*libc_ver, delim=' '), None, '(%s)'),
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ssl.OPENSSL_VERSION,
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format_field(join_nonempty(*libc_ver, delim=' '), None, ', %s'),
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)
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