Re: audit in /selinux directory
On Fri, 2007-03-09 at 16:13 -0500, Stephen Smalley wrote:
On Fri, 2007-03-09 at 15:23 -0500, Steve Grubb wrote:
> On Friday 09 March 2007 14:31, Camilo Y. Campo wrote:
> > The cat command failed and audit is saying "success". A bit strange
for
> > me. Could anybody clarify this point for me, please?
>
> It works correctly for me:
>
> fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
> open("/selinux/disable", O_RDONLY|O_LARGEFILE) = -1 EACCES (Permission
denied)
You got EACCES rather than EINVAL, so your test didn't reach the same
point in the code path. Try it as root (and with appropriate SELinux
role/domain if under -strict or -mls).
I tried it, and the open succeeds, but the read fails with -EINVAL
because the underlying pseudo file doesn't implement a read method at
all for that node. So the audit is only capturing the open, which was
successful.
> write(2, "cat: ", 5cat: ) = 5
>
> type=PATH msg=audit(03/09/2007 15:21:10.652:947) : item=0
> name=/selinux/disable inode=13 dev=00:0e mode=file,200 ouid=root ogid=root
> rdev=00:00 obj=system_u:object_r:security_t:s0
> type=CWD msg=audit(03/09/2007 15:21:10.652:947) : cwd=/home/sgrubb
> type=SYSCALL msg=audit(03/09/2007 15:21:10.652:947) : arch=i386 syscall=open
> success=no exit=-13(Permission denied) a0=bfca4954 a1=8000 a2=0 a3=8000
> items=1 ppid=4740 pid=4741 auid=sgrubb uid=sgrubb gid=sgrubb euid=sgrubb
> suid=sgrubb fsuid=sgrubb egid=sgrubb sgid=sgrubb fsgid=sgrubb tty=pts0
> comm=cat exe=/bin/cat subj=user_u:system_r:unconfined_t:s0 key=(null)
>
> Try running with strace so you can see the open syscall.
>
> -Steve
>
> --
> Linux-audit mailing list
> Linux-audit(a)redhat.com
> https://www.redhat.com/mailman/listinfo/linux-audit
--
Stephen Smalley
National Security Agency