Bug 992950 - SELinux is preventing /usr/sbin/unix_chkpwd from using the 'dac_override' capabilities.
SELinux is preventing /usr/sbin/unix_chkpwd from using the 'dac_override' cap...
Status: CLOSED DUPLICATE of bug 992931
Product: Fedora
Classification: Fedora
Component: selinux-policy (Show other bugs)
x86_64 Unspecified
unspecified Severity unspecified
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Assigned To: Miroslav Grepl
Fedora Extras Quality Assurance
Depends On:
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Reported: 2013-08-05 05:28 EDT by Samium Gromoff
Modified: 2013-08-05 10:31 EDT (History)
3 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2013-08-05 10:31:09 EDT
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Regression: ---
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RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Samium Gromoff 2013-08-05 05:28:02 EDT
Description of problem:
I am trying to run ejabberd with PAM authentication, but SELinux shoots down PAM-related machinery
during client authentication.

I have the following in my /etc/ejabberd/ejabberd.conf:
---- >8 ----
{auth_method, pam}.
{pam_service, "login"}.
---- 8< ----
SELinux is preventing /usr/sbin/unix_chkpwd from using the 'dac_override' capabilities.

*****  Plugin dac_override (91.4 confidence) suggests  ***********************

If you want to help identify if domain needs this access or you have a file with the wrong permissions on your system
Then turn on full auditing to get path information about the offending file and generate the error again.

Turn on full auditing
# auditctl -w /etc/shadow -p w
Try to recreate AVC. Then execute
# ausearch -m avc -ts recent
If you see PATH record check ownership/permissions on file, and fix it, 
otherwise report as a bugzilla.

*****  Plugin catchall (9.59 confidence) suggests  ***************************

If you believe that unix_chkpwd should have the dac_override 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 unix_chkpwd /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp

Additional Information:
Source Context                system_u:system_r:rabbitmq_beam_t:s0
Target Context                system_u:system_r:rabbitmq_beam_t:s0
Target Objects                 [ capability ]
Source                        unix_chkpwd
Source Path                   /usr/sbin/unix_chkpwd
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           pam-1.1.6-12.fc19.x86_64
Target RPM Packages           
Policy RPM                    selinux-policy-3.12.1-69.fc19.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 3.9.5-301.fc19.x86_64 #1 SMP Tue
                              Jun 11 19:39:38 UTC 2013 x86_64 x86_64
Alert Count                   4
First Seen                    2013-08-05 13:26:24 MSK
Last Seen                     2013-08-05 13:26:31 MSK
Local ID                      2b38c612-c47a-45af-b90a-58a35452340a

Raw Audit Messages
type=AVC msg=audit(1375694791.125:2106): avc:  denied  { dac_override } for  pid=16560 comm="unix_chkpwd" capability=1  scontext=system_u:system_r:rabbitmq_beam_t:s0 tcontext=system_u:system_r:rabbitmq_beam_t:s0 tclass=capability

type=AVC msg=audit(1375694791.125:2106): avc:  denied  { dac_read_search } for  pid=16560 comm="unix_chkpwd" capability=2  scontext=system_u:system_r:rabbitmq_beam_t:s0 tcontext=system_u:system_r:rabbitmq_beam_t:s0 tclass=capability

type=SYSCALL msg=audit(1375694791.125:2106): arch=x86_64 syscall=open success=no exit=EACCES a0=7ff87b5a243b a1=80000 a2=1b6 a3=0 items=0 ppid=16249 pid=16560 auid=4294967295 uid=0 gid=989 euid=0 suid=0 fsuid=0 egid=989 sgid=989 fsgid=989 ses=4294967295 tty=(none) comm=unix_chkpwd exe=/usr/sbin/unix_chkpwd subj=system_u:system_r:rabbitmq_beam_t:s0 key=(null)

Hash: unix_chkpwd,rabbitmq_beam_t,rabbitmq_beam_t,capability,dac_override

Additional info:
reporter:       libreport-2.1.6
hashmarkername: setroubleshoot
kernel:         3.9.5-301.fc19.x86_64
type:           libreport
Comment 1 Miroslav Grepl 2013-08-05 10:31:09 EDT

*** This bug has been marked as a duplicate of bug 992931 ***

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