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[3.11] gh-79096: Protect cookie file created by {LWP,Mozilla}CookieJar.save() (GH-93463) #93636
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….save() (pythonGH-93463) Note: This change is not effective on Microsoft Windows. Cookies can store sensitive information and should therefore be protected against unauthorized third parties. This is also described in issue python#79096. The filesystem permissions are currently set to 644, everyone can read the file. This commit changes the permissions to 600, only the creater of the file can read and modify it. This improves security, because it reduces the attack surface. Now the attacker needs control of the user that created the cookie or a ways to circumvent the filesystems permissions. This change is backwards incompatible. Systems that rely on world-readable cookies will breake. However, one could argue that those are misconfigured in the first place.
Fixup of pythonGH-93463: - remove stray print - use proper way to check file mode - add working chmod decorator Co-authored-by: Łukasz Langa <lukasz@langa.pl>
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All commit authors signed the Contributor License Agreement. |
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@pSub can you click through the CLA process again for this other e-mail? We only have |
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@ambv Done. |
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Note: This change is not effective on Microsoft Windows.
Cookies can store sensitive information and should therefore be protected
against unauthorized third parties. This is also described in issue #79096.
The filesystem permissions are currently set to 644, everyone can read the
file. This commit changes the permissions to 600, only the creater of the file
can read and modify it. This improves security, because it reduces the attack
surface. Now the attacker needs control of the user that created the cookie or
a ways to circumvent the filesystems permissions.
This change is backwards incompatible. Systems that rely on world-readable
cookies will breake. However, one could argue that those are misconfigured in
the first place.
This PR also includes fixes from GH-93614.