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gh-107361: strengthen default SSL context flags #112389

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merged 19 commits into from Mar 6, 2024
Merged

gh-107361: strengthen default SSL context flags #112389

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f0e262e
gh-107361: strengthen default SSL context flags
woodruffw Nov 25, 2023
4782048
add news entry
woodruffw Nov 25, 2023
732b953
ssl: expand comment
woodruffw Nov 25, 2023
15c0313
ssl.rst: further explain new X509 flags
woodruffw Nov 29, 2023
2aceb81
whatsnew: add ssl.create_default_context changes
woodruffw Nov 29, 2023
eb2c6e4
gitattributes: mark certdata as generated
woodruffw Nov 29, 2023
668803c
gitattributes: avoid {} glob syntax
woodruffw Nov 29, 2023
da318a6
Update Doc/library/ssl.rst
woodruffw Dec 1, 2023
4ae44d1
ssl.rst: explain how to disable VERIFY_X509_STRICT
woodruffw Dec 1, 2023
792383a
Apply suggestions from code review
woodruffw Dec 6, 2023
f1b59ed
whatsnew/3.13: add note for disabling VERIFY_X509_STRICT
woodruffw Dec 6, 2023
c8a7bb5
Merge remote-tracking branch 'upstream/main' into default-ssl-verify-…
woodruffw Feb 1, 2024
f6c3af3
test: add a backstop test for VERIFY_X509_STRICT
woodruffw Feb 2, 2024
ff087fb
test: try a higher base error
woodruffw Feb 2, 2024
e46a672
test: require OpenSSL 3+ for test_verify_strict
woodruffw Feb 16, 2024
fe42d9a
Merge remote-tracking branch 'upstream/main' into default-ssl-verify-…
woodruffw Feb 16, 2024
1a3e037
test: whitespace
woodruffw Feb 16, 2024
cef6950
Merge remote-tracking branch 'upstream/main' into default-ssl-verify-…
woodruffw Mar 4, 2024
2c7b14e
Merge remote-tracking branch 'upstream/main' into default-ssl-verify-…
woodruffw Mar 6, 2024
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5 changes: 5 additions & 0 deletions Doc/library/ssl.rst
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Expand Up @@ -194,6 +194,11 @@ purposes.
:data:`PROTOCOL_TLS_SERVER` protocol instead of generic
:data:`PROTOCOL_TLS`.

.. versionchanged:: 3.13

The context now uses :data:`VERIFY_X509_PARTIAL_CHAIN` and
:data:`VERIFY_X509_STRICT` in its default flags.
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Exceptions
^^^^^^^^^^
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9 changes: 9 additions & 0 deletions Lib/ssl.py
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Expand Up @@ -704,6 +704,15 @@ def create_default_context(purpose=Purpose.SERVER_AUTH, *, cafile=None,
else:
raise ValueError(purpose)

# `VERIFY_X509_PARTIAL_CHAIN` makes OpenSSL's chain building behave more
# like RFC 3280 and 5280, which specify that chain building stops with the
# first trust anchor, even if that anchor is not self-signed.
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# `VERIFY_X509_STRICT` makes OpenSSL more conservative about the
# certificates it accepts, including "disabling workarounds for
# some broken certificates."
context.verify_flags |= (_ssl.VERIFY_X509_PARTIAL_CHAIN |
_ssl.VERIFY_X509_STRICT)

if cafile or capath or cadata:
context.load_verify_locations(cafile, capath, cadata)
elif context.verify_mode != CERT_NONE:
Expand Down
227 changes: 112 additions & 115 deletions Lib/test/certdata/allsans.pem
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Large diffs are not rendered by default.

41 changes: 21 additions & 20 deletions Lib/test/certdata/capath/b1930218.0
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@@ -1,26 +1,27 @@
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41 changes: 21 additions & 20 deletions Lib/test/certdata/capath/ceff1710.0
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@@ -1,26 +1,27 @@
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