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<H1>[Mageia-dev] RM replacement</H1>
<B>andre999</B>
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TITLE="[Mageia-dev] RM replacement">andr55 at laposte.net
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<I>Fri Aug 5 14:58:12 CEST 2011</I>
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<PRE>Colin Guthrie a écrit :
><i> 'Twas brillig, and andre999 at 05/08/11 06:50 did gyre and gimble:
</I>>><i> Luis Daniel Lucio Quiroz a écrit :
</I>>>><i> Le Jeudi 04 Août 2011 18:39:35 andre999 a écrit :
</I>>>>><i> Luis Daniel Lucio Quiroz a écrit :
</I>>>>>><i> Helo,
</I>>>>>><i>
</I>>>>>><i> As my experience in security field, to make Mageia more available in
</I>>>>>><i> enterprise environments, and specially those that are security
</I>>>>>><i> paranoid, i'm planning to port SRM. SRM is a package that does a
</I>>>>>><i> "secure" file deleting according some security standards (i dont
</I>>>>>><i> remember right now names, i guess it is something in NIST, but that
</I>>>>>><i> doesnt matter really).
</I>>>>>><i>
</I>>>>>><i> My question is, what should be the procedure that when you install srm,
</I>>>>>><i> then the normal rm command could be replaced? i was thinking in
</I>>>>>><i> pushing an alias but what other alternatives do i have?
</I>>>>>><i>
</I>>>>>><i> please comment,
</I>>>>>><i>
</I>>>>>><i> LD
</I>>>>><i>
</I>>>>><i> At first glance that sounds like a reasonable approach EXCEPT -- a
</I>>>>><i> system-level alias would be over-ridden by a user alias.
</I>>>>><i> A user could innocently have an alias such as :
</I>>>>><i> alias rm="rm -i"
</I>>>>><i>
</I>>>>><i> rm is in /bin
</I>>>>><i> - /bin/rm could be replaced with a link to srm, but I don't know if that
</I>>>>><i> would be considered acceptable.
</I>>>>><i> rm would have to be restored if srm were uninstalled
</I>>>>><i>
</I>>>>><i> - wouldn't a link in /usr/bin/rm be executed first ?
</I>>>>><i> Of course that doesn't cover execution with root privileges.
</I>>>>><i> An alias in root wouldn't necessarily work, as an admin could
</I>>>>><i> inadvertantly
</I>>>>><i> replace it with another. (By loading a new file with some changed
</I>>>>><i> alias,
</I>>>>><i> for example.)
</I>>>>><i> But probably less likely than some user doing the same on their profile.
</I>>>>><i>
</I>>>>><i> There could be other approaches as well ... :)
</I>>>><i>
</I>>>><i> You are right! :)
</I>>>><i>
</I>>>><i> Well another option could be this:
</I>>>><i>
</I>>>><i> a. we change coreutils to install /bin/rm as /bin/rm.vanilla (or
</I>>>><i> other name,
</I>>>><i> that really doesnt matter),
</I>>>><i> b. i change srm to install itself in /bin instead of /usr/bin
</I>>>><i> c. we place alternatives in both packages to provide /bin/rm, giving
</I>>>><i> preference to srm if installed, otherwise it will use rm of coreutils
</I>>>><i>
</I>>>><i> LD
</I>>><i>
</I>>><i> That would probably be the ideal approach. But it might take a while to
</I>>><i> get the changes accepted in coreutils.
</I>>><i>
</I>>><i> Maybe it could be all done from srm ?
</I>>><i> On srm install,
</I>>><i> a. rename /bin/rm to /bin/rm.vanilla (or rm.original or ?)
</I>>><i> b. create /bin/rm link to /bin/srm
</I>><i>
</I>><i> Definitely not. It's against the commandments: Thou shalt not mess with
</I>><i> another packages' files.
</I>
ok. I suspected that.
It would be nice to have a list of these points for newer packagers.
>><i> On srm uninstall, we ensure that
</I>>><i> a. rm /bin/rm link
</I>>><i> b. rename /bin/rm.vanilla to /bin/rm
</I>>><i>
</I>>><i> Hopefully that could be done reliably, with an uninstall script.
</I>><i>
</I>><i> No, this is very bad.
</I>><i>
</I>><i> It's what the alternatives system was designed to do for you, but I
</I>><i> really don't think that something as fundamental as rm should be messed
</I>><i> with in this way as I mentioned in my own email.
</I>><i>
</I>><i> srm is an add on userspace tool. To implement secure deletes properly,
</I>><i> you would want support at a lower level (i.e in the kernel/fs).
</I>
makes sense.
><i> I think srm should just be a tool people use explicitly when they want to.
</I>
When I think about it, deleting with a pattern instead of just zeros is
probably only advantageous when a disk is being disposed of -- in which case
srm being a userspace tool is not a disadvantage.
><i> Col
</I>><i>
</I>
--
André
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