spamassassin pre-compiled rules

[Dominick Grift]

On Sat, 2009-07-11 at 12:49 -0700, Vadym Chepkov wrote:
> I figured it out. There is a proper label in the policy
> 
> /var/lib/spamassassin/compiled/.*\.so.*            regular file       system_u:object_r:lib_t:s0 
> 
> It seems when a script that compiles this library runs, it creates shared libraries with spamd_var_lib_t instead. So I guess the only way to fix this issue is to run restorecon -R /var/lib/spamassassin/compiled/ right after sa-compile finishes.

The solution i described below makes spamd_t create files with a type it
can execute. That does not require you to run restorecon.

But if you do not mind to restore the context manually then lib_t might
be a reasonable solution.

Be aware though that all domains have access to lib_t

> Sincerely yours,
>   Vadym Chepkov
> 
> 
> --- On Sat, 7/11/09, Dominick Grift <domg472 at gmail.com> wrote:
> 
> > From: Dominick Grift <domg472 at gmail.com>
> > Subject: Re: spamassassin pre-compiled rules
> > To: "Vadym Chepkov" <chepkov at yahoo.com>
> > Cc: "Fedora SELinux" <fedora-selinux-list at redhat.com>
> > Date: Saturday, July 11, 2009, 12:38 PM
> > On Sat, 2009-07-11 at 05:06 -0700,
> > Vadym Chepkov wrote:
> > > spamassassin rules got updated recently and I got this
> > avc
> > > 
> > > type=AVC msg=audit(1247216252.200:31900): avc: 
> > denied  { execute } for  pid=24001 comm="spamd"
> > path="/var/lib/spamassassin/compiled/5.010/3.002005/auto/Mail/SpamAssassin/CompiledRegexps/body_0/body_0.so"
> > dev=dm-3 ino=124989 scontext=system_u:system_r:spamd_t:s0
> > tcontext=system_u:object_r:spamd_var_lib_t:s0 tclass=file
> > > 
> > > audit2allow suggests this
> > > #============= spamd_t ==============
> > > allow spamd_t spamd_var_lib_t:file execute;
> > > seems reasonable, but why is it missing in standard
> > policy?
> > > 
> > > Sincerely yours,
> > >   Vadym Chepkov
> > 
> > Is that file part of the package? 
> > /var/lib/spamassassin/compiled/5.010/3.002005/auto/Mail/SpamAssassin/CompiledRegexps/body_0/body_0.so
> > 
> > It is probably created by spamd_t.
> > 
> > The problem is that if you allow spamd_t to execute files
> > with type
> > spamd_var_lib_t then spamd_t can run everything
> > in /var/lib/spamassassin.
> > 
> > This is not so nice but it might not be a problem either
> > 
> > Looking at the path it appears that spamd put compiled
> > stuff
> > under /var/lib/spamassassin/compiled/ 
> > 
> > assuming that all stuff under there should be executable by
> > spamd_t, one
> > could consider to introduce a new type for spamd_t
> > executable files
> > there.
> > 
> > That would look something like this:
> > 
> > myspamd.te:
> > policy_module(myspamd, 0.0.1)
> > type spamd_var_lib_exec_t;
> > files_type(spamd_var_lib_exec_t)
> > require { type spamd_t; }
> > filetrans_pattern(spamd_t, spamd_var_lib_exec_t,
> > spamd_var_lib_exec_t,
> > { dir file })
> > manage_dirs_pattern(spamd_t, spamd_var_lib_exec_t,
> > spamd_var_lib_exec_t)
> > manage_files_pattern(spamd_t, spamd_var_lib_exec_t,
> > spamd_var_lib_exec_t)
> > exec_files_pattern(spamd_t, spamd_var_lib_exec_t,
> > spamd_var_lib_exec_t)
> > 
> > myspamd.fc:
> > /var/lib/spamassassin/compiled(/.*)?  --
> > gen_context(system_u:object_r:spamd_var_lib_exec_t, s0)
> > 
> > But i guess that depends on your security requirements
> > 
> > For now this could be considered a bug in selinux-policy
> > 
> > 
> > > fedora-selinux-list mailing list
> > > fedora-selinux-list at redhat.com
> > > https://www.redhat.com/mailman/listinfo/fedora-selinux-list
> > 
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