On Sun, 2006-05-28 at 11:01 +0100, Paul Howarth wrote:
> On Sun, 2006-05-28 at 11:57 +0200, Jurgen Kramer wrote:
> > On Sat, 2006-05-27 at 21:40 +0100, Paul Howarth wrote:
> > > On Sat, 2006-05-27 at 18:54 +0200, Jurgen Kramer wrote:
> > > > I am trying to add a custom PAM module (pam_poldi.so) to my FC5 system
> > > > to be able to login using a OpenPGP smartcard. I already changed the
> > > > security context of /lib/security/pam_poldi.so to match the other pam
> > > > modules (system_u:object_r:lib_t) but it seems that is not enough. In
> > > > syslog I still see:
> > > >
> > > > su: PAM unable to dlopen(/lib/security/pam_poldi.so)
> > > > su: PAM [error: /lib/security/pam_poldi.so: cannot restore segment prot
> > > > after reloc: Permission denied]
> > > >
> > > > This can propably be fixed with a chcon -t
> > > > texrel_shlib_t /lib/security/pam_poldi.so
> > > >
> > > > This will probably not survice an selinux update or relabel session.
> > > > What is the proper way to add the module so it will survice relabels and
> > > > selinux updates?
> > >
> > > This should do it:
> > >
> > > # semanage fcontext -a -t textrel_shlib_t -f
> > > -- /lib/security/pam_poldi.so
> > >
> > > (that's all one long line)
> > >
> > > You could test it by changing the context back to lib_t and then doing:
> > >
> > > # restorecon -v /lib/security/pam_poldi.so
> > >
> > > which should set it back to textrel_shlib_t.
> > Unfortunately that did not do it :(
> >
> > I still get:
> >
> > su: PAM unable to dlopen(/lib/security/pam_poldi.so)
> > su: PAM [error: /lib/security/pam_poldi.so: cannot restore segment prot
> > after reloc: Permission denied]
> > su: PAM adding faulty module: /lib/security/pam_poldi.so
> >
> > Any ideas?
>
> 1. Is the context type of /lib/security/pam_poldi.so currently set to
> textrel_shlib_t?
[root@paragon ~]# ls -Z /lib/security/pam_poldi.so
-rwxr-xr-x root root
system_u:object_r:lib_t /lib/security/pam_poldi.so
>
> 2. What "avc: denied" messages, if any, do you see in /var/log/messages
> relating to this?
audit(1148810039.087:6): avc: denied { execmod } for pid=5144
comm="su" name="pam_poldi.so" dev=sdb6 ino=13631516
scontext=user_u:system_r:unconfined_t:s0
tcontext=system_u:object_r:lib_t:s0 tclass=file
audit(1148810079.358:7): avc: denied { execheap } for pid=5172
comm="su" scontext=user_u:system_r:unconfined_t:s0
tcontext=user_u:system_r:unconfined_t:s0 tclass=process
Jurgen
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