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IDS Forum

Re: New security check?

Posted By: Art Kagel
Date: Thursday, 10 August 2017, at 3:29 p.m.

In Response To: Re: New security check? (Art Kagel)

David:

I think you are right. The oninit sees that the file "oninit" is owned by
"informix" and assumes a non-root install so only the 'owner' should have
write privs on the chunks. For a root install both owsner and group
informix have privs.

I'll have to get a sysadmin involved for this since I can't chown the
script to root as informix.

Art

Art S. Kagel, President and Principal Consultant
ASK Database Management
www.askdbmgt.com

Blog: http://informix-myview.blogspot.com/

Disclaimer: Please keep in mind that my own opinions are my own opinions
and do not reflect on the IIUG, nor any other organization with which I am
associated either explicitly, implicitly, or by inference. Neither do
those opinions reflect those of other individuals affiliated with any
entity with which I am affiliated nor those of the entities themselves.

On Thu, Aug 10, 2017 at 2:15 PM, <david@smooth1.co.uk> wrote:

> Art,
>
> Solved by making the oninit script setuid root, I wonder if this is to do
> oninit checking for a non-root installation?
>
> INVESTIGATION:
>
> Tested with 12.10.xC9 on "CentOS Linux release 7.3.1611 (Core)"
>
> Playing with strace I found that oninit does a stat of itself!
>
> I created my oninit script as user informix hence it did not have the same
> permissons as the original oninit binary.
>
> Gradually matching permissions with the oninit binary I found that if you
> make the oninit script to be setuid root then the issue is resolved.
>
> chown root oninit
> chmod o-r oninit
> chmod o-x oninit
> chmod u+s oninit (Solved!)
>
> ls -l oninit*
> -rwsrwx---. 1 root informix 99 Aug 10 20:20 oninit
> -rwsr-sr--. 1 root informix 25528408 Aug 9 06:38 oninit.su
>
> I suppose for completness we could do
>
> chmod g-w oninit
> chmod g+s oninit
> chmod o+r oninit
>
> ls -l oninit*
> -rwsr-sr--. 1 root informix 99 Aug 10 20:20 oninit
> -rwsr-sr--. 1 root informix 25528408 Aug 9 06:38 oninit.su
>
> Regards,
> David.
>
> > On 10 August 2017 at 19:35 Art Kagel <art.kagel@gmail.com> wrote:
> >
> >
> > Interesting idea Dan. Have to think if that works in all circumstances,
> but
> > it sounds like a winner.
> >
> > Art
> >
> > Art S. Kagel, President and Principal Consultant
> > ASK Database Management
> > www.askdbmgt.com
> >
> > Blog: http://informix-myview.blogspot.com/
> >
> > Disclaimer: Please keep in mind that my own opinions are my own opinions
> > and do not reflect on the IIUG, nor any other organization with which I
> am
> > associated either explicitly, implicitly, or by inference. Neither do
> > those opinions reflect those of other individuals affiliated with any
> > entity with which I am affiliated nor those of the entities themselves.
> >
> > On Thu, Aug 10, 2017 at 12:48 PM, Mueller, Daniel D. <DDMueller@west.com
> >
> > wrote:
> >
> > > We do something similar except we used an alias named oninit. Do what
> you
> > > want
> > > with the alias and then call the real oninit.
> > >
> > > Dan
> > >
> > > -----Original Message-----
> > > From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of
> Art
> > > Kagel
> > > Sent: Thursday, August 10, 2017 1:32 PM
> > > To: ids@iiug.org
> > > Subject: New security check? [39678]
> > >
> > > Folks:
> > >
> > > I renamed oninit and replaced it with a script that sets the
> environment
> > > then
> > > runs the renamed oninit binary. Wanted this to make certain that a
> manual
> > > restart has the correct environment settings.
> > >
> > > On startup using either the script or the renamed oninit the engine
> > > complains
> > > about the permissions on the root chunk and aborts the startup.
> > > Name oninit back to itself and all is well. Permissions on the root
> chunk
> > > and
> > > all the other chunk files are fine.
> > >
> > > I have done this many times in the past on earlier releases of Informix
> > > with
> > > no issues. Is there some new security check in v12.10? Is there are way
> > > around
> > > it?
> > >
> > > Art
> > >
> > > Art S. Kagel, President and Principal Consultant ASK Database
> Management
> > > www.askdbmgt.com
> > >
> > > Blog: http://informix-myview.blogspot.com/
> > >
> > > Disclaimer: Please keep in mind that my own opinions are my own
> opinions
> > > and
> > > do not reflect on the IIUG, nor any other organization with which I am
> > > associated either explicitly, implicitly, or by inference. Neither do
> those
> > > opinions reflect those of other individuals affiliated with any entity
> with
> > > which I am affiliated nor those of the entities themselves.
> > >
> > >
> > > ************************************************************
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> > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > >
> > >
> > > ************************************************************
> > > *******************
> > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > >
> > >
> >
> >
> > ************************************************************
> *******************
> > Forum Note: Use "Reply" to post a response in the discussion forum.
> >
>

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