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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (CLOUDSTACK-9593) User data check is inconsistent with python
Date Sun, 24 Dec 2017 08:32:00 GMT


ASF GitHub Bot commented on CLOUDSTACK-9593:

rhtyd commented on issue #1760: CLOUDSTACK-9593: userdata: enforce data is a multiple of 4
   Let's do a final test run and then this should be good to merge based on results
   @blueorangutan package

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> User data check is inconsistent with python
> -------------------------------------------
>                 Key: CLOUDSTACK-9593
>                 URL:
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>    Affects Versions: 4.4.2, 4.4.3, 4.3.2, 4.5.1, 4.4.4, 4.5.2, 4.6.0, 4.6.1, 4.6.2, 4.7.0,
4.7.1, 4.8.0, 4.9.0
>            Reporter: Marc-Aurèle Brothier
>            Assignee: Marc-Aurèle Brothier
> The user data is validated through the Apache commons codec library, but this library
does not check that the length is a multiple of 4 characters. The RFC does not require it
either. But the python script in the virtual router that loads the user data does check for
the possible padding presence, requiring the string to be a multiple of 4 characters.
> {code:python}
> >>> import base64
> >>> base64.b64decode('foo')
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/",
line 78, in b64decode
>     raise TypeError(msg)
> TypeError: Incorrect padding
> >>> base64.b64decode('foo=')
> '~\x8a'
> {code}
> Currently since the java check is less restrictive, the user data gets saved into the
database but the VR script crashes when it receives this VM user data. On a single VM it is
not really a problem. The critical issue is when a VR is restarted. The invalid pythonic base64
string makes the script crashed, resulting in a VR not starting at all.

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