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pam_tally2.so的PAM模块,来限定用户的登录失败次数,如果次数达到设置的阈值,则锁定用户
系统是CentOS release 6.9 (Final)
1.如果只限制本地login方式登录(tty),只需配置 /etc/pam.d/login
$ cat /etc/pam.d/login #%PAM-1.0 auth required pam_tally2.so deny=3 unlock_time=300 even_deny_root root_unlock_time=300 auth [user_unknown=ignore success=ok ignore=ignore default=bad] pam_securetty.so auth include system-auth account required pam_nologin.so account include system-auth password include system-auth # pam_selinux.so close should be the first session rule session required pam_selinux.so close session required pam_loginuid.so session optional pam_console.so # pam_selinux.so open should only be followed by sessions to be executed in the user context session required pam_selinux.so open session required pam_namespace.so session optional pam_keyinit.so force revoke session include system-auth -session optional pam_ck_connector.so
even_deny_root : 也限制root用户;
deny : 设置普通用户和root用户连续错误登陆的最大次数,超过最大次数,则锁定该用户
unlock_time:设定普通用户锁定后,多少时间后解锁,单位是秒;
root_unlock_time:设定root用户锁定后,多少时间后解锁,单位是秒;
此处使用的是 pam_tally2 模块,如果不支持 pam_tally2 可以使用 pam_tally 模块。另外,不同的pam版本,设置可能有所不同,具体使用方法,可以参照相关模块的使用规则。
将auth required pam_tally2.so deny=3 unlock_time=300 even_deny_root root_unlock_time=300
放置在#%PAM-1.0的下面,即第二行,添加内容,一定要写在前面,如果写在后面,虽然用户被锁定,但是只要用户输入正确的密码,还是可以登录的!
2.远程ssh登录限制
首先需要打开sshd_config里的UsePAM yes 配置
$ cat /etc/ssh/sshd_config |grep UsePAM
UsePAM yes
编辑 /etc/pam.d/sshd (自己创建此文件)
$ cat /etc/pam.d/sshd #%PAM-1.0 auth required pam_tally2.so deny=3 unlock_time=300 even_deny_root root_unlock_time=300 #auth [user_unknown=ignore success=ok ignore=ignore default=bad] pam_securetty.so auth include system-auth account required pam_nologin.so account include system-auth password include system-auth # pam_selinux.so close should be the first session rule session required pam_selinux.so close session required pam_loginuid.so session optional pam_console.so # pam_selinux.so open should only be followed by sessions to be executed in the user context session required pam_selinux.so open session required pam_namespace.so session optional pam_keyinit.so force revoke session include system-auth -session optional pam_ck_connector.so
重启sshd
service sshd restart
用其他机器进行验证
查看用户登录失败的次数
$ pam_tally2 -r -u root
Login Failures Latest failure From
root 5 10/16/19 18:10:49 192.168.6.177
解锁指定用户
$ pam_tally2 --user root
Login Failures Latest failure From
root 0
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