Re: [AppArmor 39/45] AppArmor: Profile loading and manipulation,pathname matching

From: Joshua Brindle
Date: Sat Jun 09 2007 - 11:47:49 EST

david@xxxxxxx wrote:
On Sat, 9 Jun 2007, Sean wrote:

what SELinux cannot do is figure out what label to assign a new file.

Nit: SELinux figures out what to label new files fine, just not based on the name. This works in most cases, eg., when user_t creates a file in /tmp it becomes user_tmp_t, incidentally this is something that AA cannot handle, if the filenames aren't normalized (they normally aren't). For example, my ssh agent socket is stored in /tmp/ssh-XXXXXXXX, where the X's are random characters, AA can't differentiate admin ssh agents from unprivileged user ssh agents, showing a serious flaw in their model.

The complaint is that name-based labeling doesn't currently exist (and as Sean has stated that doesn't mean it _can't_ exist, just that it doesn't currently). In practice this has not been as big of an issue as you are making it out to be. Granted restorecond has a tiny race, and I wouldn't recommend using it on very security sensitive files but for usability having it relabel user_home_t to user_http_content_t isn't a problem (and causes no security issues).

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