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List:       fedora-devel-list
Subject:    Re: Restricting automounting of uncommon filesystems?
From:       Demi Marie Obenour <demiobenour () gmail ! com>
Date:       2023-07-24 3:18:45
Message-ID: c9caa64a-502c-c82b-35bc-ff9c0eebe9cc () gmail ! com
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On 7/23/23 12:10, Solomon Peachy via devel wrote:
> On Sun, Jul 23, 2023 at 11:25:12AM -0400, Neal Gompa wrote:
>>> If the system administrator wants to mount $UNCOMMONFS, they should be
>>> able to do so without hassle, but that doesn't mean that a normal user
>>> who got handed a sketchy USB stick at a conference should be able to do
>>> so with no restrictions at all.
>>>
>>
>> So then some kind of configuration to udisks2 to have a similar effect?
> 
> And we're right back at square one, with the *overwhelmingly* common case 
> of a single-user system whose "admin" is sitting in front of the system.
> 
> Of _course_ they want to mount the disk.  It's why they plugged it in, 
> and they don't give two hoots if it's a "common filesystem" or not.
> 
> (FFS, most of the stuff I personally plug in these days is ext4 or ntfs, 
> because fat32 sucks and I can't rely on exfat on all systems I need to 
> interoperate with)
> 
> And let's be realistic here -- the overwhelmingly common threat model 
> here is that there are untrusted files on a correctly-formed filesystem.  
> Bad guys rarely need or care to get root on the system; what they're 
> after requires normal, non-elevated user permissions.
> 
> Prompting users 'are you sure you want to use this device' will turn a 
> "yes" into an automatic reflex.  Not automounting by default will just 
> add another thing to the "things to change on default fedora 
> installations" lists out there (ie right after the "enable freshrpms and 
> install modern video codecs" step), becuase it's a usability nightmare.
> 
> In the "usability vs security" tradeoff, usability/convenience *always* 
> wins unless you're at a place that has armed guards at the door with 
> instructions to shoot first.
> 
>  - Solomon

Then the mount needs to be done in a sandbox, such as a KVM guest or
sandboxed userspace process.
-- 
Sincerely,
Demi Marie Obenour (she/her/hers)
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