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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 redhat com
> > https://www.redhat.com/mailman/listinfo/linux-audit
-- 
Stephen Smalley
National Security Agency


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