/usr/sbin/nologin首先我们还是从一些命令上看看，nologin 是一种禁止用户登录的办法（把 login shell 改了），faillog 可以显示登录失败次数，并可以设置最大允许失败次数。lastlog 将显示所有用户最后登录的时间。newgrp 改变登录 session 的 gid。login 会显示一个文本模式下的登录界面，输入了正确的用户名和密码后就会打开对应的 shell 和用户交互。su/sg 类似，改变执行命令的 UID/GID。
/usr/bin/faillog
/usr/bin/lastlog
/usr/bin/newgrp
/etc/pam.d/login
/etc/pam.d/su
/etc/login.defs
/etc/securetty
/bin/login
/bin/su
/usr/bin/sg
下面我们来看两个重要的文件，/etc/securetty 是允许 root 登录的终端列表；/etc/login.defs 定义了很多登录相关的变量，如 MAIL_DIR 指向邮件目录，FAILLOG_ENAB 表明是否打开登录失败日志，su/sg 的日志是否打开，HUSHLOGIN_FILE 指定一个文件，若存在则登录时不会显示相关的信息，ENV_PATH 默认的 PATH，ENV_SUPATH 默认的 su 的 PATH，PASS_MAX_DAYS、PASS_MIN_DAYS、PASS_WARN_AGE 就是上篇中 chage 对应的值，UID/GID_MIN/MAX 是 useradd/groupadd 使用的，LOGIN_RETRIES 最大允许重试次数（一般会被 pam 对应的值覆盖），LOGIN_TIMEOUT 登录超时，DEFAULT_HOME 没有 home 时是否能登录。
由于 pam 的使用，login.defs 很多功能都已经 obsolete 了。
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