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[Xen-devel] [PATCH] Scrub VNC passwords from XenD log files

The XendDomainInfo and XendConfig classes both log the guest VM config data
to the /var/log/xen/xend.log  in many places. Unfortunately the VNC passwords
are stored in plain text in the guest VM config files. So we end up with 
plain text passwords in the xend.log file

Now we can make /var/log/xen  mode 0700 to protect them from local users,
but it is very common when debugging issues to request that a user attach
the contents of /var/log/xen/xend.log to the bug report ticket, or emails
sent to mailing lists. This will obviously compromise any VNC passwords
to essentially the while world & his dog. What's more, Google will make 
it incredibly easy to search for these too.

There are a few potential approaches to this

 1. Remove all logging from xend.log
 2. Change default log level to only record WARN and higher, so DEBUG
    stuff is not recorded normally
 3. Scrub the passwords out of the data being logged
 4. Do nothing

I really don't like options 1 or 2, because the stuff XenD is logging is
actually incredibly helpful when debugging end user problems. 4 is not
really a viable option either. So we're left with 3.

Thus I am attaching a prototype patch which scrubs VNC passwords out of
the data being logged by XenD.

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Attachment: xen-3.0.4-scrub-passwords.patch
Description: Text document

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