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  3. October 2017

Re: Changing everyone's UID Was: NFS security

For Linux, you can use the find command to locate all files owned by a GID
or UID. As they are found, an exec command is then used to run a script to
change the owner and group.

John McKee.

On Tue, Oct 31, 2017 at 7:54 AM, Rob Berendt <rob@xxxxxxxxx> wrote:

Thanks. Apparently in Linux when you change the user's UID it doesn't
automatically propagate it to all owned objects and you need to do that
manually. Unlike IBM i.


Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com





From: "Kevin Bucknum" <Kevin@xxxxxxxxxxxxxxxxxxx>
To: "Midrange Systems Technical Discussion" <midrange-l@xxxxxxxxxxxx>
Date: 10/31/2017 08:51 AM
Subject: RE: Changing everyone's UID Was: NFS security
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>



For linux at least yes. If you are using active directory (at least the
way that Centrify implements it) then the uid will match the windows
one. If you have separate signons it is easy enough to change it. I just
used these instructions last week to match linux uid/gid to windows
specifically so that I could use NFS and not have to worry about mapping
numbers.
https://www.cyberciti.biz/faq/linux-change-user-group-uid-gid-for-all-ow
ned-files/





Kevin Bucknum
Senior Programmer Analyst
MEDDATA/MEDTRON
Tel: 985-893-2550

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf
Of Rob Berendt
Sent: Tuesday, October 31, 2017 7:41 AM
To: Midrange Systems Technical Discussion
Subject: Changing everyone's UID Was: NFS security

Due to NFS security concerns I am thinking of changing everyone's UID
on
every system to match their employee number. This sure beats opening
up
our /Banking subdirectory to QNFSANON so every Tom, Dick and Harry can
MOUNT over that EXPORTFS.

Anyone see a concern with this?

From my reading I see that the user cannot be active in any process.
And if we have any temporary employee numbers we often use an alpha
character which we'll have to use a number instead.

https://www.ibm.com/support/knowledgecenter/en/ssw_ibm_i_73/apis/Q
SYCHGID.htm

Also, not that this affects my current project but is there some way
to set a
Windows user UID? Linux?

Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1 Group Dekko Dept 1600
Mail
to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com





From: Rob Berendt <rob@xxxxxxxxx>
To: Midrange Systems Technical Discussion
<midrange-l@xxxxxxxxxxxx>
Date: 10/31/2017 08:27 AM
Subject: Re: NFS security
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>



Thank you. That's exactly what I am looking for.
Now comes the next project: Changing everyone's "User ID number" UID.
Stay tuned for follow up thread...


Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com





From: Jack Kingsley <iseriesflorida@xxxxxxxxx>
To: Midrange Systems Technical Discussion
<midrange-l@xxxxxxxxxxxx>
Date: 10/31/2017 05:27 AM
Subject: Re: NFS security
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>



Rob, check number 3 out when you have time.
http://www-01.ibm.com/support/docview.wss?uid=nas8N1016376



On Mon, Oct 30, 2017 at 3:20 PM, Rob Berendt <rob@xxxxxxxxx> wrote:

I am talking about NFS, as in EXPORTFS and MOUNT. I am not talking
about
QNTC, NetServer and that stuff.

When I EXPORTFS a directory and some other lpar (could also be
Windows
or
Linux) does a MOUNT on this, the user associated with the access is
QNFSANON. Well, I have a problem with having to run
CHGAUT OBJ('/Banking') USER(QNFSANON) DTAAUT(*RWX)
OBJAUT(*ALL)
SUBTREE(*ALL)
to allow access to the '/Banking' directory to every Tom, Dick and
Harry
to allow NFS access between lpars.
Is there some option on EXPORTFS to say use the credentials of the
remote
user?

Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com

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