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gh-107361: strengthen default SSL context flags#112389

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f0e262e
gh-107361: strengthen default SSL context flags
woodruffwNov 25, 2023
4782048
add news entry
woodruffwNov 25, 2023
732b953
ssl: expand comment
woodruffwNov 25, 2023
15c0313
ssl.rst: further explain new X509 flags
woodruffwNov 29, 2023
2aceb81
whatsnew: add ssl.create_default_context changes
woodruffwNov 29, 2023
eb2c6e4
gitattributes: mark certdata as generated
woodruffwNov 29, 2023
668803c
gitattributes: avoid {} glob syntax
woodruffwNov 29, 2023
da318a6
Update Doc/library/ssl.rst
woodruffwDec 1, 2023
4ae44d1
ssl.rst: explain how to disable VERIFY_X509_STRICT
woodruffwDec 1, 2023
792383a
Apply suggestions from code review
woodruffwDec 6, 2023
f1b59ed
whatsnew/3.13: add note for disabling VERIFY_X509_STRICT
woodruffwDec 6, 2023
c8a7bb5
Merge remote-tracking branch 'upstream/main' into default-ssl-verify-…
woodruffwFeb 1, 2024
f6c3af3
test: add a backstop test for VERIFY_X509_STRICT
woodruffwFeb 2, 2024
ff087fb
test: try a higher base error
woodruffwFeb 2, 2024
e46a672
test: require OpenSSL 3+ for test_verify_strict
woodruffwFeb 16, 2024
fe42d9a
Merge remote-tracking branch 'upstream/main' into default-ssl-verify-…
woodruffwFeb 16, 2024
1a3e037
test: whitespace
woodruffwFeb 16, 2024
cef6950
Merge remote-tracking branch 'upstream/main' into default-ssl-verify-…
woodruffwMar 4, 2024
2c7b14e
Merge remote-tracking branch 'upstream/main' into default-ssl-verify-…
woodruffwMar 6, 2024
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2 changes: 2 additions & 0 deletions.gitattributes
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Original file line numberDiff line numberDiff line change
Expand Up@@ -83,6 +83,8 @@ Include/opcode_ids.h generated
Include/token.h generated
Lib/_opcode_metadata.py generated
Lib/keyword.py generated
Lib/test/certdata/*.pem generated
Lib/test/certdata/*.0 generated
Lib/test/levenshtein_examples.json generated
Lib/test/test_stable_abi_ctypes.py generated
Lib/token.py generated
Expand Down
20 changes: 20 additions & 0 deletionsDoc/library/ssl.rst
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Expand Up@@ -151,6 +151,12 @@ purposes.
variable :envvar:`SSLKEYLOGFILE` is set, :func:`create_default_context`
enables key logging.

The default settings for this context include
:data:`VERIFY_X509_PARTIAL_CHAIN` and :data:`VERIFY_X509_STRICT`.
These make the underlying OpenSSL implementation behave more like
a conforming implementation of :rfc:`5280`, in exchange for a small
amount of incompatibility with older X.509 certificates.

.. note::
The protocol, options, cipher and other settings may change to more
restrictive values anytime without prior deprecation. The values
Expand All@@ -172,6 +178,15 @@ purposes.
ctx = ssl.create_default_context(Purpose.CLIENT_AUTH)
ctx.options &= ~ssl.OP_NO_SSLv3

.. note::
This context enables :data:`VERIFY_X509_STRICT` by default, which
may reject pre-:rfc:`5280` or malformed certificates that the
underlying OpenSSL implementation otherwise would accept. While disabling
this is not recommended, you can do so using::

ctx = ssl.create_default_context()
ctx.verify_flags &= ~ssl.VERIFY_X509_STRICT

.. versionadded:: 3.4

.. versionchanged:: 3.4.4
Expand All@@ -194,6 +209,11 @@ 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 verify flags.


Exceptions
^^^^^^^^^^
Expand Down
16 changes: 15 additions & 1 deletionDoc/whatsnew/3.13.rst
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Expand Up@@ -62,7 +62,6 @@ Summary -- Release highlights
.. This section singles out the most important changes in Python 3.13.
Brevity is key.


.. PEP-sized items next.

Important deprecations, removals or restrictions:
Expand DownExpand Up@@ -192,6 +191,21 @@ Other Language Changes

(Contributed by Arthur Tacca and Jason Zhang in :gh:`115957`.)

* The :func:`ssl.create_default_context` API now includes
:data:`ssl.VERIFY_X509_PARTIAL_CHAIN` and :data:`ssl.VERIFY_X509_STRICT`
in its default flags.

.. note::

:data:`ssl.VERIFY_X509_STRICT` may reject pre-:rfc:`5280` or malformed
certificates that the underlying OpenSSL implementation otherwise would
accept. While disabling this is not recommended, you can do so using::

ctx = ssl.create_default_context()
ctx.verify_flags &= ~ssl.VERIFY_X509_STRICT

(Contributed by William Woodruff in :gh:`112389`.)

New Modules
===========

Expand Down
10 changes: 10 additions & 0 deletionsLib/ssl.py
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Expand Up@@ -704,6 +704,16 @@ 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.
#
# `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 deletionsLib/test/certdata/allsans.pem
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41 changes: 21 additions & 20 deletionsLib/test/certdata/capath/b1930218.0
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@@ -1,26 +1,27 @@
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-----END CERTIFICATE-----
41 changes: 21 additions & 20 deletionsLib/test/certdata/capath/ceff1710.0
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@@ -1,26 +1,27 @@
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-----END CERTIFICATE-----
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