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Bug 1402316 - cockpit-session cannot change limits
Summary: cockpit-session cannot change limits
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: selinux-policy
Version: 7.3
Hardware: All
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Lukas Vrabec
QA Contact: Milos Malik
URL:
Whiteboard:
: 1402495 (view as bug list)
Depends On:
Blocks: 1420851
TreeView+ depends on / blocked
 
Reported: 2016-12-07 08:59 UTC by Zdenek Pytela
Modified: 2020-07-16 09:02 UTC (History)
10 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2017-08-01 15:17:42 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Knowledge Base (Solution) 2801961 0 None None None 2016-12-13 17:09:21 UTC
Red Hat Product Errata RHBA-2017:1861 0 normal SHIPPED_LIVE selinux-policy bug fix update 2017-08-01 17:50:24 UTC

Description Zdenek Pytela 2016-12-07 08:59:34 UTC 
Description of problem:
After upgrade to RHEL 7.3, connection to cockpit dashboard fails with Permission denied when the user has limits configured. A setrlimit attempt avc denial is reported by audit.

Version-Release number of selected component (if applicable):
selinux-policy-3.13.1-102.el7_3.4.noarch
cockpit-118-2.el7.x86_64

How reproducible:
always

Steps to Reproduce:
1. Connect with a browser to a RHEL 7.3 vm: https://rhel73:9090/
2. Login with root or any other user
3. Add a limit configuration line:
echo "* hard core 0"  >> /etc/security/limits.conf
4. Reboot 
5. Try to login to cockpit again. 

Actual results:
Permission denied message

Expected results:
Log in without error messages

Additional info:
Dec 02 10:50:46 rhel73 cockpit-session[1234]: pam_ssh_add: Failed adding some keys
Dec 02 10:50:46 rhel73 cockpit-session[4455]: pam_limits(cockpit:session): Could not set limit for 'core': Permission denied
Dec 02 10:50:46 rhel73 cockpit-ws[1111]: cockpit-session: couldn't open session: root: Permission denied
Comment 1 Zdenek Pytela 2016-12-07 09:05:22 UTC 
Audit entries:

type=SERVICE_START msg=audit(1480694554.810:141): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=cockpit comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
type=USER_AUTH msg=audit(1480694554.876:142): pid=2304 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:cockpit_session_t:s0 msg='op=PAM:authentication grantors=pam_unix acct="username" exe="/usr/libexec/cockpit-session" hostname=192.168.22.1 addr=192.168.22.1 terminal=? res=success'
type=USER_ACCT msg=audit(1480694554.877:143): pid=2304 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:cockpit_session_t:s0 msg='op=PAM:accounting grantors=pam_unix,pam_localuser acct="username" exe="/usr/libexec/cockpit-session" hostname=192.168.22.1 addr=192.168.22.1 terminal=? res=success'
type=CRED_ACQ msg=audit(1480694554.878:144): pid=2304 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:cockpit_session_t:s0 msg='op=PAM:setcred grantors=pam_unix acct="username" exe="/usr/libexec/cockpit-session" hostname=192.168.22.1 addr=192.168.22.1 terminal=? res=success'
type=LOGIN msg=audit(1480694554.878:145): pid=2304 uid=0 subj=system_u:system_r:cockpit_session_t:s0 old-auid=4294967295 auid=1000 old-ses=4294967295 ses=4 res=1
type=USER_ROLE_CHANGE msg=audit(1480694554.954:146): pid=2304 uid=0 auid=1000 ses=4 subj=system_u:system_r:cockpit_session_t:s0 msg='pam: default-context=unconfined_u:unconfined_r:unconfined_t:s0 selected-context=unconfined_u:unconfined_r:unconfined_t:s0 exe="/usr/libexec/cockpit-session" hostname=192.168.22.1 addr=192.168.22.1 terminal=? res=success'
type=AVC msg=audit(1480694554.971:147): avc:  denied  { setrlimit } for  pid=2304 comm="cockpit-session" scontext=system_u:system_r:cockpit_session_t:s0 tcontext=system_u:system_r:cockpit_session_t:s0 tclass=process
type=SYSCALL msg=audit(1480694554.971:147): arch=c000003e syscall=160 success=no exit=-13 a0=4 a1=7fff74105f30 a2=7f98435af768 a3=0 items=0 ppid=2300 pid=2304 auid=1000 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4 comm="cockpit-session" exe="/usr/libexec/cockpit-session" subj=system_u:system_r:cockpit_session_t:s0 key=(null)
type=USER_START msg=audit(1480694554.988:148): pid=2304 uid=0 auid=1000 ses=4 subj=system_u:system_r:cockpit_session_t:s0 msg='op=PAM:session_open grantors=? acct="username" exe="/usr/libexec/cockpit-session" hostname=192.168.22.1 addr=192.168.22.1 terminal=? res=failed'
type=SERVICE_STOP msg=audit(1480694644.846:149): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=cockpit comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'

Looks like some changes were made in the policy:
rhel72# sesearch -s cockpit_session_t -t cockpit_session_t -c process -A
Found 4 semantic av rules:
   allow cockpit_session_t cockpit_session_t : process { fork sigchld sigkill sigstop signull signal getsched setsched getsession getcap getattr setexec setrlimit setkeycreate } ;
   allow login_pgm domain : process sigkill ;
   allow cockpit_session_t cockpit_session_t : process setfscreate ;
   allow cockpit_session_t cockpit_session_t : process setfscreate ;

rhel73# sesearch -s cockpit_session_t -t cockpit_session_t -c process -A
Found 4 semantic av rules:
   allow login_pgm domain : process sigkill ;
   allow cockpit_session_t cockpit_session_t : process { fork sigchld sigkill sigstop signull signal getsched setsched getcap setexec setkeycreate } ;
   allow cockpit_session_t cockpit_session_t : process setfscreate ;
   allow cockpit_session_t cockpit_session_t : process setfscreate ;

f22 and f25 looks the same like rhel73
Comment 3 Ryan Howe 2016-12-09 19:45:51 UTC 
Related to bug 1402495
Comment 4 Lukas Vrabec 2016-12-13 08:34:03 UTC 
*** Bug 1402495 has been marked as a duplicate of this bug. ***
Comment 10 errata-xmlrpc 2017-08-01 15:17:42 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2017:1861
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