Re: Controlling execution of Java JAR files with SELinux RBAC

["Philip Seeley" <pseeley@xxxxxxxxxxx>]

Hi Bill,

This is probably because the default RHEL6 configuration does not include any categories in the user_u SELinux user's range:

# semanage user -l

                Labeling   MLS/       MLS/                          
SELinux User    Prefix     MCS Level  MCS Range                      SELinux Roles

guest_u         user       s0         s0                             guest_r
root            user       s0         s0-s0:c0.c1023                 staff_r sysadm_r system_r unconfined_r
staff_u         user       s0         s0-s0:c0.c1023                 staff_r sysadm_r system_r unconfined_r
sysadm_u        user       s0         s0-s0:c0.c1023                 sysadm_r
system_u        user       s0         s0-s0:c0.c1023                 system_r unconfined_r
unconfined_u    user       s0         s0-s0:c0.c1023                 system_r unconfined_r
user_u          user       s0         s0                             user_r

You probably have to extend the user definition to include the categories you're using. As an example, this gives all categories:

# semanage user -m -r s0:c0.c1023 user_u

# semanage user -l

                Labeling   MLS/       MLS/                          
SELinux User    Prefix     MCS Level  MCS Range                      SELinux Roles

guest_u         user       s0         s0                             guest_r
root            user       s0         s0-s0:c0.c1023                 staff_r sysadm_r system_r unconfined_r
staff_u         user       s0         s0-s0:c0.c1023                 staff_r sysadm_r system_r unconfined_r
sysadm_u        user       s0         s0-s0:c0.c1023                 sysadm_r
system_u        user       s0         s0-s0:c0.c1023                 system_r unconfined_r
unconfined_u    user       s0         s0-s0:c0.c1023                 system_r unconfined_r
user_u          user       s0         s0:c0.c1023                    user_r

Hope that helps.

Phil


Bill Durant ---24/05/2017 12:34:53---Hello Phil: Thank you for the suggestion. I have tried the steps from the URL that

From: Bill Durant <littus@xxxxxxxxxx>
To: Philip Seeley <pseeley@xxxxxxxxxxx>
Cc: littus@xxxxxxxxxx, selinux@xxxxxxxxxxxxxxxxxxxxxxx
Date: 24/05/2017 12:34
Subject: Re: Controlling execution of Java JAR files with SELinux RBAC

---

Hello Phil:

Thank you for the suggestion.  I have tried the steps from the URL that you provided without success.

I get an error when I try to assign Linux user mary to an SELinux login as follows:

# cat /etc/redhat-release
CentOS release 6.9 (Final)

;;; Add "s0:c0=NetworkAdministrator" and "s0:c1=Operator" to /etc/selinux/targeted/setrans.conf

# cat /etc/selinux/targeted/setrans.conf
#
# Multi-Category Security translation table for SELinux
#
# Uncomment the following to disable translation libary
# disable=1
#
# Objects can be categorized with 0-1023 categories defined by the admin.
# Objects can be in more than one category at a time.
# Categories are stored in the system as c0-c1023.  Users can use this
# table to translate the categories into a more meaningful output.
# Examples:
# s0:c0=CompanyConfidential
# s0:c1=PatientRecord
# s0:c2=Unclassified
# s0:c3=TopSecret
# s0:c1,c3=CompanyConfidentialRedHat
s0:c0=NetworkAdministrator
s0:c1=Operator
s0=SystemLow
s0-s0:c0.c1023=SystemLow-SystemHigh
s0:c0.c1023=SystemHigh

# service mcstrans start

# chcat -L
s0:c0                          NetworkAdministrator
s0:c1                          Operator
s0                             SystemLow
s0-s0:c0.c1023                 SystemLow-SystemHigh
s0:c0.c1023                    SystemHigh


# useradd mary
# passwd mary
Changing password for user mary.
New password:
Retype new password:
passwd: all authentication tokens updated successfully.

# semanage login -a mary

# chcat -l -- +NetworkAdministrator mary
libsemanage.validate_handler: MLS range s0-s0:c0 for Unix user mary exceeds allowed range s0 for SELinux user user_u (No such file or directory).
libsemanage.validate_handler: seuser mapping [mary -> (user_u, s0-s0:c0)] is invalid (No such file or directory).
libsemanage.dbase_llist_iterate: could not iterate over records (No such file or directory).
/usr/sbin/semanage: Could not commit semanage transaction

I would appreciate any hints on how to resolve that error.

Thanks!

Bill

On 05/23/2017 05:49 PM, Philip Seeley wrote:

Hi Bill,

Have you thought about using categories?

https://www.centos.org/docs/5/html/Deployment_Guide-en-US/sec-mcs-getstarted.html

Cheers

Phil

Bill D ---24/05/2017 09:52:00---Greetings: I have been trying to figure out how to control the execution of Java

From: Bill D <littus@xxxxxxxxxx>
To: selinux@xxxxxxxxxxxxxxxxxxxxxxx
Cc: littus@xxxxxxxxxx
Date: 24/05/2017 09:52
Subject: Controlling execution of Java JAR files with SELinux RBAC

---




Greetings:

I have been trying to figure out how to control the execution of Java
JAR files with SELinux RBAC.

I have two Linux users named joe and mary and two Java JAR files named
jack.jar and mary.jar.

Here is how jack executes jack.jar: java -jar jack.jar

Here is how mary executes mary.jar: java -jar mary.jar

I would like SELinux RBAC to prevent jack from executing mary.jar and
prevent mary from executing jack.jar.

How to configure SELinux RBAC to make that happen?

I have tried various approaches without success.  I have also tried the
steps in http://forums.fedoraforum.org/archive/index.php/t-222938.html 
without success.

I would greatly appreciate any hints.

Regards,

Bill


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