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gh-107361: strengthen default SSL context flags by woodruffw · Pull Request #112389 · python/cpython

See python#107361: this adds `VERIFY_X509_STRICT` to make the default
SSL context perform stricter (per RFC 5280) validation, as well
as `VERIFY_X509_PARTIAL_CHAIN` to enforce more standards-compliant
path-building behavior.

As part of this changeset, I had to tweak `make_ssl_certs.py`
slightly to emit 5280-conforming CA certs. This changeset includes
the regenerated certificates after that change.

malemburg

Signed-off-by: William Woodruff <william@yossarian.net>
Signed-off-by: William Woodruff <william@yossarian.net>
Signed-off-by: William Woodruff <william@yossarian.net>
Signed-off-by: William Woodruff <william@yossarian.net>

vstinner

sethmlarson

malemburg

…flags

Signed-off-by: William Woodruff <william@yossarian.net>
…flags

Signed-off-by: William Woodruff <william@yossarian.net>

adorilson pushed a commit to adorilson/cpython that referenced this pull request

Mar 25, 2024
This adds `VERIFY_X509_STRICT` to make the default
SSL context perform stricter (per RFC 5280) validation, as well
as `VERIFY_X509_PARTIAL_CHAIN` to enforce more standards-compliant
path-building behavior.

As part of this changeset, I had to tweak `make_ssl_certs.py`
slightly to emit 5280-conforming CA certs. This changeset includes
the regenerated certificates after that change.

Signed-off-by: William Woodruff <william@yossarian.net>
Co-authored-by: Victor Stinner <vstinner@python.org>

diegorusso pushed a commit to diegorusso/cpython that referenced this pull request

Apr 17, 2024
This adds `VERIFY_X509_STRICT` to make the default
SSL context perform stricter (per RFC 5280) validation, as well
as `VERIFY_X509_PARTIAL_CHAIN` to enforce more standards-compliant
path-building behavior.

As part of this changeset, I had to tweak `make_ssl_certs.py`
slightly to emit 5280-conforming CA certs. This changeset includes
the regenerated certificates after that change.

Signed-off-by: William Woodruff <william@yossarian.net>
Co-authored-by: Victor Stinner <vstinner@python.org>

This was referenced

Aug 27, 2025