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Re: Adding a custom PAM module and selinux



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?

2. What "avc:  denied" messages, if any, do you see in /var/log/messages
relating to this?

Paul.


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