On a freshly installed 7.3 box, /etc/pam.d/sshd has permissions of 0600, while
all other pam.d configuration files have permissions of 0644.  Is there any
reason for sshd to be different?

[kaboom@hanuman pam.d]$ ls -l
total 18
-rw-r--r--    1 root     root          272 Apr 19 01:05 authconfig
-rw-r--r--    1 root     root          330 Apr  1 16:26 chfn
-rw-r--r--    1 root     root          330 Apr  1 16:26 chsh
-rw-r--r--    1 root     root          225 Apr 15 16:15 halt
-rw-r--r--    1 root     root          144 Apr 17 16:44 imap
-rw-r--r--    1 root     root          157 Apr  1 16:26 kbdrate
-rw-r--r--    1 root     root          427 Apr  1 16:26 login
-rw-r--r--    1 root     root          210 Apr  9 21:24 other
-rw-r--r--    1 root     root          211 Mar 13 18:44 passwd
-rw-r--r--    1 root     root          144 Apr 17 16:44 pop
-rw-r--r--    1 root     root          225 Apr 15 16:15 poweroff
-rw-r--r--    1 root     root          225 Apr 15 16:15 reboot
-rw-r--r--    1 root     root          144 Apr  8 04:55 smtp
-rw-------    1 root     root          452 Apr  4 20:27 sshd
-rw-r--r--    1 root     root          659 Apr  8 10:02 su
-rw-r--r--    1 root     root          278 Apr 18 10:35 sudo
-rw-r--r--    1 root     root          643 May  8 23:50 system-auth
-rw-r--r--    1 root     root          157 Apr 18 21:10 xserver
[kaboom@hanuman pam.d]$