Bug 815867 - SELinux is preventing /usr/bin/bash from using the 'net_admin' capabilities.
SELinux is preventing /usr/bin/bash from using the 'net_admin' capabilities.
Product: Fedora
Classification: Fedora
Component: selinux-policy (Show other bugs)
x86_64 Unspecified
unspecified Severity unspecified
: ---
: ---
Assigned To: Miroslav Grepl
Fedora Extras Quality Assurance
: Reopened
Depends On:
  Show dependency treegraph
Reported: 2012-04-24 13:12 EDT by rksomayaji
Modified: 2012-05-08 00:22 EDT (History)
3 users (show)

See Also:
Fixed In Version: selinux-policy-3.10.0-121.fc17
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2012-05-08 00:22:02 EDT
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)

  None (edit)
Description rksomayaji 2012-04-24 13:12:51 EDT
libreport version: 2.0.10
executable:     /usr/bin/python2.7
hashmarkername: setroubleshoot
kernel:         3.3.2-1.fc17.x86_64
time:           Tuesday 24 April 2012 10:43:43 PM IST

:SELinux is preventing /usr/bin/bash from using the 'net_admin' capabilities.
:*****  Plugin catchall (100. confidence) suggests  ***************************
:If you believe that bash should have the net_admin capability by default.
:Then you should report this as a bug.
:You can generate a local policy module to allow this access.
:allow this access for now by executing:
:# grep Default /var/log/audit/audit.log | audit2allow -M mypol
:# semodule -i mypol.pp
:Additional Information:
:Source Context                system_u:system_r:xdm_t:s0-s0:c0.c1023
:Target Context                system_u:system_r:xdm_t:s0-s0:c0.c1023
:Target Objects                 [ capability ]
:Source                        Default
:Source Path                   /usr/bin/bash
:Port                          <Unknown>
:Host                          (removed)
:Source RPM Packages           bash-4.2.24-1.fc17.x86_64
:Target RPM Packages           
:Policy RPM                    selinux-policy-3.10.0-116.fc17.noarch
:Selinux Enabled               True
:Policy Type                   targeted
:Enforcing Mode                Enforcing
:Host Name                     (removed)
:Platform                      Linux (removed) 3.3.2-1.fc17.x86_64 #1
:                              SMP Fri Apr 13 20:23:49 UTC 2012 x86_64 x86_64
:Alert Count                   3
:First Seen                    Tuesday 24 April 2012 04:17:48 PM IST
:Last Seen                     Tuesday 24 April 2012 10:10:43 PM IST
:Local ID                      493b2c67-ff52-41db-a582-b6fbddc96c11
:Raw Audit Messages
:type=AVC msg=audit(1335285643.607:256): avc:  denied  { net_admin } for  pid=27351 comm="Default" capability=12  scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tclass=capability
:type=AVC msg=audit(1335285643.607:256): avc:  denied  { write } for  pid=27351 comm="Default" name="icmp_echo_ignore_all" dev="proc" ino=22700 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:sysctl_net_t:s0 tclass=file
:type=SYSCALL msg=audit(1335285643.607:256): arch=x86_64 syscall=open success=no exit=EACCES a0=24fefe0 a1=201 a2=1b6 a3=fffffffe items=0 ppid=27218 pid=27351 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm=Default exe=/usr/bin/bash subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 key=(null)
:Hash: Default,xdm_t,xdm_t,capability,net_admin
:audit2allowunable to open /sys/fs/selinux/policy:  Permission denied
:audit2allow -Runable to open /sys/fs/selinux/policy:  Permission denied
Comment 1 Daniel Walsh 2012-04-24 13:48:14 EDT
What is Default, and icmp_echo_ignore_all doing?  This looks like local customization and probably not something you want the login program doing.

You can add dontaudit rules

# grep xdm_t /var/log/audit/audit.log | audit2allow -M myxdm
# semodule -i myxdm.pp
Comment 2 Daniel Walsh 2012-04-24 14:04:47 EDT
Actually I just spoke to the gdm packager here and now I understand  a little better what you are doing.
Comment 3 Daniel Walsh 2012-04-24 14:06:56 EDT
Miroslav gdm executes /etc/gdm/*/Default or /etc/gdm/*/:[0-9]+ as root and administrators can put anything they want into these files.

I think to make this work we will need a new domain gdm_unconfined_t and gdm_unconfined_exec_t, so when gdm executes these executables, they will be allowed full control on a system that does not have the unconfined domain disabled.
Comment 4 Daniel Walsh 2012-04-24 14:16:42 EDT
Fixed in selinux-policy-3.10.0-118.fc17.noarch
Comment 5 Fedora Update System 2012-04-27 07:52:42 EDT
selinux-policy-3.10.0-119.fc17 has been submitted as an update for Fedora 17.
Comment 6 Fedora Update System 2012-05-04 18:16:34 EDT
Package selinux-policy-3.10.0-121.fc17:
* should fix your issue,
* was pushed to the Fedora 17 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing selinux-policy-3.10.0-121.fc17'
as soon as you are able to.
Please go to the following url:
then log in and leave karma (feedback).
Comment 7 Fedora Update System 2012-05-08 00:22:02 EDT
selinux-policy-3.10.0-121.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.

Note You need to log in before you can comment on or make changes to this bug.