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Do not backport Python 3.10 SSL configuration for LibreSSL (#5464)

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Until further investigation.

Fixes regression in 5b9f253fa0

Authored by: coletdjnz
This commit is contained in:
Matthew 2022-11-07 09:30:55 +13:00 committed by GitHub
parent 96b9e9cf62
commit ac8e69dd32
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1 changed files with 8 additions and 1 deletions
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9
yt_dlp/utils.py
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@ -986,16 +986,23 @@ def make_HTTPS_handler(params, **kwargs):
context.options |= 4 # SSL_OP_LEGACY_SERVER_CONNECT
# Allow use of weaker ciphers in Python 3.10+. See https://bugs.python.org/issue43998
context.set_ciphers('DEFAULT')
elif sys.version_info < (3, 10) and ssl.OPENSSL_VERSION_INFO >= (1, 1, 1):
elif (
sys.version_info < (3, 10)
and ssl.OPENSSL_VERSION_INFO >= (1, 1, 1)
and not ssl.OPENSSL_VERSION.startswith('LibreSSL')
):
# Backport the default SSL ciphers and minimum TLS version settings from Python 3.10 [1].
# This is to ensure consistent behavior across Python versions, and help avoid fingerprinting
# in some situations [2][3].
# Python 3.10 only supports OpenSSL 1.1.1+ [4]. Because this change is likely
# untested on older versions, we only apply this to OpenSSL 1.1.1+ to be safe.
# LibreSSL is excluded until further investigation due to cipher support issues [5][6].
# 1. https://github.com/python/cpython/commit/e983252b516edb15d4338b0a47631b59ef1e2536
# 2. https://github.com/yt-dlp/yt-dlp/issues/4627
# 3. https://github.com/yt-dlp/yt-dlp/pull/5294
# 4. https://peps.python.org/pep-0644/
# 5. https://peps.python.org/pep-0644/#libressl-support
# 6. https://github.com/yt-dlp/yt-dlp/commit/5b9f253fa0aee996cf1ed30185d4b502e00609c4#commitcomment-89054368
context.set_ciphers('@SECLEVEL=2:ECDH+AESGCM:ECDH+CHACHA20:ECDH+AES:DHE+AES:!aNULL:!eNULL:!aDSS:!SHA1:!AESCCM')
context.minimum_version = ssl.TLSVersion.TLSv1_2