Restrict Users to Use Old Passwords

This is very useful if you want to disallow users to use same old passwords. The old password file is located at/etc/security/opasswd. This can be achieved by using PAM module.

Open ‘/etc/pam.d/system-auth‘ file under RHEL / CentOS / Fedora.

# vi /etc/pam.d/system-auth

Open ‘/etc/pam.d/common-password‘ file under Ubuntu/Debian/Linux Mint.

# vi /etc/pam.d/common-password

Add the following line to ‘auth‘ section.

auth        sufficient    pam_unix.so likeauth nullok

Add the following line to ‘password‘ section to disallow a user from re-using last 5 password of his or her.

password   sufficient    pam_unix.so nullok use_authtok md5 shadow remember=5

Only last 5 passwords are remember by server. If you tried to use any of last 5 old passwords, you will get an error like.

Password has been already used. Choose another.

Restrict Users to Use Old Passwords相关推荐

MySQL外键设置中的的 Cascade、Restrict、SET NULL 、NO ACTION
DROP [TEMPORARY] TABLE [IF EXISTS] tbl_name [, tbl_name] ... [RESTRICT | CASCADE] <1> ...
C 线程中容易忽视的 restrict 修饰符修饰
restrict: 告诉编译器: 更多的使用的是构造函数原型的时候需要对源码进行重构的时候需要注意相关的问题不同的指针,指向不同的地址,不能指向相同的地址
MySQL外键设置中的的 Cascade、NO ACTION、Restrict、SET NULL
. cascade方式在父表上update/delete记录时,同步update/delete掉子表的匹配记录 . set null方式在父表上update/delete记录时,将子表上匹配记录的 ...
[20160513]Restrict Session与静态监听.txt
[20160513]Restrict Session与静态监听.txt --给同事讲解动静态监听时,一次测试,当执行后alter system enable restricted session;发现 ...
C语言中的const，volatile与restrict的使用
1. const 变量声明中带有关键词const,意味着不能通过赋值,增量或减量来修改该变量的值,这是显而易见的一点.指针使用const则要稍微复杂点,因为不得不把让指针本身成为const和指针指向的 ...
UNIX中的restrict
restrict是c99引入的,它只可以用于限定指针,并表明指针是访问一个数据对象的唯一且初始的方式. 仅当第二个指针基于第一个时,才能对对象进行存取. 例子考虑下面的例子: int ar[10]; ...
【转载】register、volatile、restrict 三关键字的用法
原文地址:register.volatile.restrict 三关键字的用法 – RaymondAmos的技术专栏 – CSDN博客. register 使用修饰符register声明的变量属于寄存 ...
《101 Windows Phone 7 Apps》读书笔记-PASSWORDS SECRETS
课程内容 Ø 加密和解密 Ø 密码输入框 Ø 值转换 Ø DataTimeOffset Ø 可观察集合 Ø INotifyPropertyChanged事件 Passwords & Secre ...
Access restriction: The type BASE64Encoder is not accessible due to restrict
在eclipse中使用sun.misc.BASE64Encoder,却提示"Access restriction: The type BASE64Encoder is not accessi ...

Restrict Users to Use Old Passwords

Restrict Users to Use Old Passwords相关推荐

最新文章

热门文章