OS version：Red Hat Enterprise Linux Server release 6.4
Kernel version：2.6.32-358.el6.x86_64
-------------------------------------------------------------------------
准备工作：
[root@Zhai ~]# groupadd pam_ssh
[root@Zhai ~]# useradd pam_test1 -G pam_ssh
[root@Zhai ~]# useradd pam_test2 -G pam_ssh
[root@Zhai ~]# useradd pam_test3
[root@Zhai ~]# useradd pam_test4
[root@Zhai ~]# useradd pam_test5
验证pam_permit.so：
[root@Zhai ~]# vi /etc/pam.d/sshd
#%PAM-1.0
auth required pam_permit.so
account required pam_unix.so
session required pam_loginuid.so 
验证pam_deny.so：
#%PAM-1.0
auth required pam_deny.so
account required pam_unix.so
session required pam_loginuid.so 
验证pam_time.so：
#%PAM-1.0
auth required pam_permit.so
account required pam_unix.so
account required pam_time.so
session required pam_loginuid.so [root@Zhai ~]# vi /etc/security/time.conf
# Add by zhai_kang
# The default is to accept
# Only 01:00-01:04 Tuesday,Wednesday 00:05-00:08, pam_test3 can't log in via ssh
sshd;*;pam_test3;Tu0100-0104 | We0005-0008
# Only 01:00-01:04 Tuesday, pam_test4 can't log in via ssh
sshd;*;pam_test4;!Tu0100-0104
# Only 01:00-01:04 Tuesday, pam_test5 can log in via ssh
sshd;*;pam_test5;Tu0100-0104 验证pam_echo.so：
#%PAM-1.0
auth required pam_permit.so
account required pam_unix.so
session required pam_echo.so file=/etc/message [root@Zhai ~]# vi /etc/message
+---------------------------------------------------+
welcome to %h Server
Login User: %u
Login from: %H
+---------------------------------------------------+ 验证pam_limits.so：
#%PAM-1.0
auth required pam_permit.so
account required pam_unix.so
session required pam_limits.so debug conf=/etc/security/limits.conf [root@Zhai ~]# vi /etc/security/limits.conf
pam_test3 - maxlogins 2 [root@Zhai ~]# > /var/log/secure
[root@Zhai ~]# cat /var/log/secure
The detailed information：man pam_permit
The detailed information：man pam_deny
The detailed information：man pam_time
The detailed information：man pam_echo
The detailed information：man time.conf
The detailed information：man pam_limits
The detailed information：man limits.conf