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<p><FONT class=normalfont><B><font color=blue>在Linux Shell程序中进行身份验证</font></B></FONT><BR><FONT class=smallfont color=#ff9900>2004-04-23 15:18 pm</FONT><BR><FONT class=normalfont>作者：hutuworm<br>来自：Linux知识宝库<br>联系方式：无名<br><br>※缘起<br>
<br>
Linux系统管理员常常碰到的头痛问题是，在确定系统没有被入侵的前提下，<br>
不知道哪个猪头不小心运行了某个特定用途的Shell程序，把系统搞得一塌<br>
糊涂。而且，系统记录显示该猪头使用的是公用帐号（root或者admin），<br>
你无法知道这个猪头在现实生活中具体对应的是哪一头猪。<br>
<br>
<br>
※开场<br>
<br>
针对以上问题，解决方案有二：其一，追查时间和ip，根据时间和ip，可以<br>
追查到该猪头是从哪个饲料槽拱过来的。不过猪圈里往往存在饲料槽混用问<br>
题，这套解决方案只能确定以某猪为首的一群可疑猪。if大家都是通过代理<br>
连服务器的话，那除了one by one查log之外更无良策了。其二，在Shell程<br>
序中通过身份验证记录log，明确责任。<br>
<br>
<br>
※求解<br>
<br>
本文利用Qmail作者D. J. Bernstein大师编写的checkpassword工具进行身份<br>
验证。<br>
1. 下载：<br>
http://cr.yp.to/checkpwd/checkpassword-0.90.tar.gz<br>
2. 安装：<br>
tar xvfz checkpassword-0.90.tar.gz<br>
cd checkpassword-0.90<br>
make<br>
make setup check<br>
3. 如果可执行文件checkpassword没有在/bin下出现的话，goto 1<br>
<br>
再加上下面这段程序就大功告成了：<br>
<br>
－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－<br>
#!/bin/sh<br>
#<br>
# Filename: auth.sh<br>
# Author: hutuworm<br>
# @Copyleft 2003 hutuworm.org<br>
#<br>
function auth_failed () {<br>
echo "靠，你耍俺老猪啊？"<br>
exit 1<br>
}<br>
echo "※※※※※※※※※※※"<br>
echo "※猪圈重地 闲人莫入※"<br>
echo "※※※※※※※※※※※"<br>
printf "请输入帐号："<br>
read ACCOUNT<br>
if [ $ACCOUNT = 'admin' -o $ACCOUNT = 'root' ]<br>
then<br>
echo "本圈不欢迎admin&root！"<br>
exit 1<br>
fi<br>
printf "请输入密码："<br>
stty -echo<br>
read PASSWORD<br>
stty echo<br>
echo ""<br>
printf "$ACCOUNT</FONT><br>
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