[Freeipa-users] Allow user or group to switch user without password and not becoming root

[Andrey Ptashnik]

Thank you everyone for your help!

I found two ways to implement it in IPA server and tested it. So both methods work in my current setup RHEL 7.1 and IPA server 4.1.0. First method allows user to run default terminal as a target user (bash in my case). Second method is using SU command, but runs it as a root user. So depending on security preferences either one could satisfy admins.

===================================

Options:
!authenticate

Who:
user1

Access this Host:
webserver

Run Commands:
/usr/bin/sudo
/bin/bash

As Whom:
oracle (external user type is oracle is created locally only)

How is it working:
[user1 at webserver ~]$ sudo -u oracle bash -i
[oracle at webserver user1]$

===================================

Options:
!authenticate

Who:
user1

Access this Host:
webserver

Run Commands:
/usr/bin/sudo
/bin/su - oracle

As Whom:
root

How is it working:
[user1 at webserver ~]$ sudo su - oracle
Last login: Wed May 13 11:41:52 CDT 2015 on pts/0
[oracle at webserver ~]$

===================================

For some reason NOPASSWD: option was not recognized correctly by IPA server. This is the output I was getting:

[user1 at webserver ~]$ sudo su - oracle
sudo: unknown defaults entry `NOPASSWD:'
Last login: Tue May 12 15:00:31 CDT 2015 on pts/1
Last failed login: Wed May 13 10:46:52 CDT 2015 on pts/0
There were 7 failed login attempts since the last successful login.
[oracle at webserver ~]$

Regards,

Andrey Ptashnik


From: <Gould>, Joshua <Joshua.Gould at osumc.edu<mailto:Joshua.Gould at osumc.edu>>
Date: Tuesday, May 12, 2015 at 9:41 PM
To: "dpal at redhat.com<mailto:dpal at redhat.com>" <dpal at redhat.com<mailto:dpal at redhat.com>>, "freeipa-users at redhat.com<mailto:freeipa-users at redhat.com>" <freeipa-users at redhat.com<mailto:freeipa-users at redhat.com>>
Subject: Re: [Freeipa-users] Allow user or group to switch user without password and not becoming root

For the NOPASSWD option, I found that using !authenticate  in the sudo option is what IPA wants instead.


$ ipa sudorule-add-option readfiles
Sudo Option: !authenticate
-----------------------------------------------------
Added option "!authenticate" to Sudo rule "readfiles"
-----------------------------------------------------

From: Dmitri Pal <dpal at redhat.com<mailto:dpal at redhat.com>>
Organization: Red Hat
Reply-To: "dpal at redhat.com<mailto:dpal at redhat.com>" <dpal at redhat.com<mailto:dpal at redhat.com>>
Date: Tuesday, May 12, 2015 at 5:32 PM
To: "freeipa-users at redhat.com<mailto:freeipa-users at redhat.com>" <freeipa-users at redhat.com<mailto:freeipa-users at redhat.com>>
Subject: Re: [Freeipa-users] Allow user or group to switch user without password and not becoming root

On 05/12/2015 04:44 PM, Andrey Ptashnik wrote:
Hello Team,

We have RHEL 7.1 and IPA server 4.1.0 in our environment as well as stack of Oracle software that require existence of local passwordless users like weblogic and oracle.
Users log in to servers via domain accounts at IPA server.

I’m trying to configure Sudo policy in IPA server that will allow users in the company to log in to servers in IPA domain and switch to weblogic or oracle user without having to enter any passwords, but also without increasing their privileges to root.
Using plain /etc/sudoers file it can be accomplished something like below:

%users ALL = (root)

Users will be who of the IPA sudo rule

NOPASSWD:

This will be an option that you would put into the sudo rule

/bin/su – oracle

This will be the command. You create a command and then reference it in the rule.

At least this is what I would try.


How can I configure this behavior in IPA server?

Regards,

Andrey






--
Thank you,
Dmitri Pal

Director of Engineering for IdM portfolio
Red Hat, Inc.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/freeipa-users/attachments/20150513/84d28d64/attachment.htm>