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Ensure that passwords are never long enough for a DoS.

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* Limit the password length to 4096 bytes
  * Password hashers will raise a ValueError
  * django.contrib.auth forms will fail validation
* Document in release notes that this is a backwards incompatible change

Thanks to Josh Wright for the report, and Donald Stufft for the patch.

This is a security fix; disclosure to follow shortly.
This commit is contained in:
Russell Keith-Magee 2013-09-15 13:40:16 +08:00
parent 351a061497
commit aae5a96d57
4 changed files with 153 additions and 17 deletions
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8
docs/releases/1.7.txt
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@ -402,6 +402,14 @@ Miscellaneous
Rationale behind this is removal of dependency of non-contrib code on
contrib applications.
* Passwords longer than 4096 bytes in length will no longer work and will
instead raise a ``ValueError`` when using the hasher directory or the
built in forms shipped with ``django.contrib.auth`` will fail validation.
The rationale behind this is a possibility of a Denial of Service attack when
using a slow password hasher, such as the default PBKDF2, and sending very
large passwords.
Features deprecated in 1.7
==========================