gh-114905: Test that ssl._create_stdlib_context() rejects check_hostname with CERT_NONE - #155509
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serhiy-storchaka merged 1 commit intoAug 13, 2026
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…_hostname with CERT_NONE With PROTOCOL_TLS_CLIENT, which became the default protocol in 3.10, this is an error. With an explicitly specified legacy protocol it used to succeed, silently raising verify_mode to CERT_REQUIRED and ignoring the requested CERT_NONE. No caller of ssl._create_stdlib_context() in the standard library passes check_hostname, so no public API reaches it.
serhiy-storchaka
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Thanks @serhiy-storchaka for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13. |
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Thanks @serhiy-storchaka for the PR 🌮🎉.. I'm working now to backport this PR to: 3.14. |
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Thanks @serhiy-storchaka for the PR 🌮🎉.. I'm working now to backport this PR to: 3.15. |
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GH-155670 is a backport of this pull request to the 3.13 branch. |
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GH-155671 is a backport of this pull request to the 3.14 branch. |
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GH-155672 is a backport of this pull request to the 3.15 branch. |
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…k_hostname with CERT_NONE (GH-155509) (GH-155670) With PROTOCOL_TLS_CLIENT, which became the default protocol in 3.10, this is an error. With an explicitly specified legacy protocol it used to succeed, silently raising verify_mode to CERT_REQUIRED and ignoring the requested CERT_NONE. No caller of ssl._create_stdlib_context() in the standard library passes check_hostname, so no public API reaches it. (cherry picked from commit 726e485) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
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Aug 13, 2026
…k_hostname with CERT_NONE (GH-155509) (GH-155671) With PROTOCOL_TLS_CLIENT, which became the default protocol in 3.10, this is an error. With an explicitly specified legacy protocol it used to succeed, silently raising verify_mode to CERT_REQUIRED and ignoring the requested CERT_NONE. No caller of ssl._create_stdlib_context() in the standard library passes check_hostname, so no public API reaches it. (cherry picked from commit 726e485) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
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Aug 14, 2026
…_hostname with CERT_NONE (pythonGH-155509) With PROTOCOL_TLS_CLIENT, which became the default protocol in 3.10, this is an error. With an explicitly specified legacy protocol it used to succeed, silently raising verify_mode to CERT_REQUIRED and ignoring the requested CERT_NONE. No caller of ssl._create_stdlib_context() in the standard library passes check_hostname, so no public API reaches it.
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Pin the current behaviour of
ssl._create_stdlib_context()with check_hostname, and explain in a comment why check_hostname is assigned before verify_mode.With
PROTOCOL_TLS_CLIENT, which became the default protocol in 3.10, this is an error. With an explicitly specified legacy protocol it used to succeed, silently raising verify_mode toCERT_REQUIREDand ignoring the requestedCERT_NONE.No caller of
_create_stdlib_context()in the standard library passes check_hostname, so no public API reaches it.