Description of problem:

PAM authentication in libreswan (via xauth) fails in pam_unix pluto PAM stack due to missing dac_read_search capability for unix_chkpwd.

Version-Release number of selected component (if applicable):

selinux-policy-3.13.1-97.el7
libreswan-3.15-8.el7

How reproducible:

100%

Steps to Reproduce:

Configure xauthby=pam for libreswan and bring up the connection, for detailed steps please see RHBZ#1278063#c5.

Actual results:

Connection does not work, authentication failure.

# ausearch -ts 12:06:56 -m avc -sv no
----
time->Sat Sep 17 12:06:56 2016
type=PATH msg=audit(1474106816.540:2362): item=0 name="/etc/shadow" inode=67668197 dev=fd:00 mode=0100000 ouid=0 ogid=0 rdev=00:00 obj=system_u:object_r:shadow_t:s0 objtype=NORMAL
type=CWD msg=audit(1474106816.540:2362):  cwd="/run/pluto"
type=SYSCALL msg=audit(1474106816.540:2362): arch=c000003e syscall=2 success=no exit=-13 a0=7fb186b7c453 a1=80000 a2=1b6 a3=24 items=1 ppid=23533 pid=23668 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="unix_chkpwd" exe="/usr/sbin/unix_chkpwd" subj=system_u:system_r:chkpwd_t:s0 key=(null)
type=AVC msg=audit(1474106816.540:2362): avc:  denied  { dac_read_search } for  pid=23668 comm="unix_chkpwd" capability=2  scontext=system_u:system_r:chkpwd_t:s0 tcontext=system_u:system_r:chkpwd_t:s0 tclass=capability

# ausearch -ts 12:06:56 -m avc -sv no | audit2allow 

#============= chkpwd_t ==============
allow chkpwd_t self:capability dac_read_search;

Expected results:

Successful authentication.

Additional info:

Please see RHBZ#1278063 for more details.