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Hello Phil: Thank you for the response. Your suggested fix resolved the error. However, I am unable to get the desired effect. I am not able to prevent a Linux user from running/accessing a Java JAR file using SELinux categories. I would appreciate any other hints to make this work. Following are the details of what I did: # semanage user -l Labeling MLS/ MLS/ SELinux User Prefix MCS Level MCS Range SELinux Roles git_shell_u user SystemLow SystemLow git_shell_r guest_u user SystemLow SystemLow guest_r root user SystemLow SystemLow-SystemHigh staff_r sysadm_r system_r unconfined_r staff_u user SystemLow SystemLow-SystemHigh staff_r sysadm_r system_r unconfined_r sysadm_u user SystemLow SystemLow-SystemHigh sysadm_r system_u user SystemLow SystemLow-SystemHigh system_r unconfined_r unconfined_u user SystemLow SystemLow-SystemHigh system_r unconfined_r user_u user SystemLow SystemLow user_r xguest_u user SystemLow SystemLow xguest_r # semanage user -m -r s0-s0:c0.c1023 user_u # semanage user -l Labeling MLS/ MLS/ SELinux User Prefix MCS Level MCS Range SELinux Roles git_shell_u user SystemLow SystemLow git_shell_r guest_u user SystemLow SystemLow guest_r root user SystemLow SystemLow-SystemHigh staff_r sysadm_r system_r unconfined_r staff_u user SystemLow SystemLow-SystemHigh staff_r sysadm_r system_r unconfined_r sysadm_u user SystemLow SystemLow-SystemHigh sysadm_r system_u user SystemLow SystemLow-SystemHigh system_r unconfined_r unconfined_u user SystemLow SystemLow-SystemHigh system_r unconfined_r user_u user SystemLow SystemLow-SystemHigh user_r xguest_u user SystemLow SystemLow xguest_r # cat 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 restart Stopping mcstransd: [ OK ] Starting mcstransd: [ OK ] # chcat -L s0:c0 NetworkAdministrator s0:c1 Operator s0 SystemLow s0-s0:c0.c1023 SystemLow-SystemHigh s0:c0.c1023 SystemHigh # useradd foo # useradd bar # passwd foo Changing password for user foo. New password: Retype new password: passwd: all authentication tokens updated successfully. # passwd bar Changing password for user bar. New password: Retype new password: passwd: all authentication tokens updated successfully. # semanage login -a foo # semanage login -a bar # chcat -l -- +NetworkAdministrator foo # chcat -l -- +Operator bar # chcat -L -l bar foo bar: s0:c0.c1023,c1 <===== why is it not just s0:c1? foo: s0:c0.c1023,c0 <===== why is it not just just s0:c0? # chcat -- +NetworkAdministrator /usr/local/soup/bin/Foo.jar # ls -Z /usr/local/soup/bin/Foo.jar -rwxr-xr-x. admin admin system_u:object_r:bin_t:NetworkAdministrator /usr/local/soup/bin/Foo.jar Now Login as the 'foo' Linux user and notice that it can run Foo.jar as expected $ whoami foo $ id -Z user_u:user_r:user_t:SystemLow-SystemHigh $ ls -Z /usr/local/soup/bin/Foo.jar -rwxr-xr-x. admin admin system_u:object_r:bin_t:NetworkAdministrator /usr/local/soup/bin/Foo.jar $ java -jar /usr/local/soup/bin/Foo.jar Hello Foo Now login as the 'bar' Linux user and notice that it can also run Foo.jar which is NOT expected $ whoami bar $ id -Z user_u:user_r:user_t:SystemLow-SystemHigh $ ls -Z /usr/local/soup/bin/Foo.jar -rwxr-xr-x. admin admin system_u:object_r:bin_t:NetworkAdministrator /usr/local/soup/bin/Foo.jar $ java -jar /usr/local/soup/bin/Foo.jar Hello Foo Why is Linux user 'bar' able to run/access Foo.jar when its category doesn't match Foo.jar's category? Following is how to create the Foo.jar file: $ cat Foo.java public class Foo { public static void main(String[] args) { System.out.println("Hello Foo"); } } $ cat manifest.txt Main-Class: $ javac Foo.java $ jar cvfe Foo.jar Foo Foo.class added manifest adding: Foo.class(in = 409) (out= 282)(deflated 31%) Best Regards, Bill On 05/24/2017 04:39 PM, Philip Seeley
wrote:
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Bill D ---25/05/2017 02:28:19---Hello
Phil, I have tried your suggestion of extending the user_u
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