On Wed, 2009-03-04 at 10:45 -0500, Daniel J Walsh wrote:
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> Stephen Smalley wrote:
> > On Wed, 2009-03-04 at 23:09 +1100, Russell Coker wrote:
> >> Why does the dbus-daemon want to read the cmdline of every process that it
> >> talks to? Is it something to allow or dontaudit? It appears to work without
> >> allowing it.
> >>
> >> type=AVC msg=audit(1236168464.840:83): avc: denied { search } for pid=2757
> >> comm="dbus-daemon" name="2874" dev=proc ino=12535
> >> scontext=unconfined_u:unconfined_r:system_dbusd_t:s0-s0:c0.c1023
> >> tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=dir
> >> type=AVC msg=audit(1236168464.840:83): avc: denied { read } for pid=2757
> >> comm="dbus-daemon" name="cmdline" dev=proc ino=12536
> >> scontext=unconfined_u:unconfined_r:system_dbusd_t:s0-s0:c0.c1023
> >> tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=file
> >> type=SYSCALL msg=audit(1236168464.840:83): arch=40000003 syscall=5 success=yes
> >> exit=16 a0=b8481fa0 a1=0 a2=b3a a3=b84826c0 items=0 ppid=1 pid=2757
> >> auid=4294967295 uid=103 gid=105 euid=103 suid=103 fsuid=103 egid=105 sgid=105
> >> fsgid=105 tty=(none) ses=4294967295 comm="dbus-daemon"
> >> exe="/usr/bin/dbus-daemon"
> >> subj=unconfined_u:unconfined_r:system_dbusd_t:s0-s0:c0.c1023 key=(null)
> >
> > It appears to fetch that information for logging purposes (comm= field).
> >
> dbus also has the ability to state that an executable is the only one
> that is able to communicate over it. Not very secure. But it is there.
>
> I can put in the config that only /usr/libexec/nm-applet is able to
> communicate with network-manager.
That sort of restriction should be implemented based on SELinux domains
rather than program name. Just a matter of defining policy for the
client programs and configuring the dbus policy appropriately.
--
Stephen Smalley
National Security Agency
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