实用:使用PHP脚本修改Linux或Unix系统口令
本文介绍如何使用PHP脚本修改Linux或Unix系统口令。
需要的工具和安装:
你必须安装下面的工具和软件:
– 修改口令的Shell脚本;
– Sudo 访问权;
– Apache or Lighttpd web 服务器;
– PHP服务端程序。
步骤1: 安装可以修改用户口令的shell脚本
该脚本可以实际用于修改Linux用户的口令(已在Linux和FreeBSD测试)。
例子: shell脚本代码
#!/bin/sh # \ exec expect -f “$0″ ${1+”$@”} set password [lindex $argv 1] spawn passwd [lindex $argv 0] sleep 1 expect “assword:” send “$password\r” expect “assword:” send “$password\r” expect eof运行shell脚本(下载链接):
$ chpasswd username password 下载该脚本, 然后拷贝到你的web根目录或者web服务器的其它位置(用户可读):
$ cp chpasswd /var/www/或者, 如果你使用Lighttpd web服务器:
$ cp chpasswd /home/lighttpd步骤2: 通过sudo以root身份执行命令
Apache或Lighttpd web服务器进入后台运行后会马上使用非root权限。这样可以很好的防止口令修改, 就像passwd命令需要root权限才能修改其它用户帐号的口令。
通常, Apache 2使用www-data用户, Lighttpd使用lighttpd用户(皆为普通用户, 非root用户)。使用root用户登陆, 然后执行下面的命令:
# visudo现在你的web服务器允许执行口令修改脚本(chpasswd)。如果你使用Apache web服务器, 执行下面的命令:
www-data ALL=NOPASSWD: /var/www/chpasswd或者, 如果你使用Lighttpd web服务器, 执行下面的命令:
httpd ALL=NOPASSWD: /home/lighttpd/chpasswd保存和退出文件。
步骤3. 创建一个基于PHP的接口
现在你需要写一个php脚本。这里有一个php脚本实例。你可以根据你的需要来修改。至少你需要正确设置好的shell脚本位置。打开php脚本和找到shellscript一行:
$shellscript = “sudo /home/lighttpd/chpasswd”;修改shellscript指向到正确的位置。PHP的源代码从这里下载:
步骤4: 运行脚本
在你的web浏览器地址栏输入网地址 - https://mydomain.com/changepassword.php。你将会看到用户名和口令提示:
如果口令修改成功, 你会得到的确认提示:
由于一些原因, 如果口令修改失败, 你可以参考下面提示获得更多详细的错误信息:
步骤5: 安全
◆永远不要通过http协议直接运行上面的脚本. 而是使用https协议。
◆把脚本放入到受口令保护的目录。
◆永远不要信任用户的输入。上面的php脚本只是一个例子。在现实的生产环境中, 你需要考虑采用更强大的用户输入确认。讨论PHP编程的安全超出了本文的范围。你可以参考一本好的PHP书籍或者使用你喜欢的搜索引擎搜索相关的网站。

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