Re: [gentoo-hardened] SELinux policy rules concerning access to /etc/shadow

[Chris PeBenito]

On Tue, 2004-03-30 at 17:10, Bill McCarty wrote:
> neverallow ~{ auth auth_write } shadow_t:file ~getattr;

This forces shadow access to only be through PAM, with few exceptions.

> To log in via SSH and become the system administrator, I find that I must
> add the following permissions, which contradict the constraint:
>
> allow sshd_t shadow_t:file { getattr read };
> allow sysadm_su_t shadow_t:file { getattr read };

I've not seen this.  It seems like you don't have >=pam-0.77 installed,
since it affects sshd and su.

> I tried to investigate the auth type, but can't find where it's defined.

It is an attribute, see attrib.te.

> I also find that I must:
>
> 1. enable reading of random_device_t:chr_file for a variety of subjects.

This is most likely related to the glibc SSP __guard_setup issue, and is
probably ok to leave denied or dontaudited if you don't use SSP.

> 2. enable i/o to device_t:chr_file and *tty_device_t:chr file for a variety
> of subjects.

This is too broad to make any suggestions.

-- 
Chris PeBenito
<pebenito@g.o>
Developer,
Hardened Gentoo Linux
Embedded Gentoo Linux
 
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