說明:大家平時對Linux服務器安全主要是對系統用戶的檢查，登陸服務器IP檢查，以及防火墻狀態檢查！

1.需要把正確系統用戶名存儲在/root/liu_shell/local_user.txt文件中，然后進行比較!
2.對登陸IP判斷是不是以192.168.1和192.168.2開頭的IP為正常IP!
3.判斷iptables狀態!

代碼如下:  
#!/usr/bin/python
#coding=utf-8
import sys,os,re,socket
host=str(socket.gethostname().strip())
fuhao=os.linesep
def user_panduan():
    file01=file('/etc/passwd')
    mmm=[]
    for xx in file01:
        mmm.append(re.split(':',xx)[0])
    file01.close()
    file02=file('/root/liu_shell/new_user.txt','w')
    for yy in mmm:
        file02.write('%s%s' %(yy,fuhao))
    file02.close()
    f_local=file('/root/liu_shell/local_user.txt')
    f_new=file('/root/liu_shell/new_user.txt')
    local_user=[]
    new_user=[]
    for line1 in f_local:
        line1=line1.strip()
        local_user.append(line1)
    for line2 in f_new:
        line2=line2.strip()
        new_user.append(line2)
    f_local.close()
    f_new.close()
    if local_user==new_user:
        print 'host:%s user ok' %host
    else:
        cmd="echo 'host:%s user error' |mail -s  user_error 331095659@qq.com " %host
        os.system(cmd)
def ip_panduan():
    os.system("last|awk '{print $3}'|grep -v [a-z]|grep -v ^$|sort |uniq >/root/liu_shell/local_ip.txt")
    f_ip=file('/root/liu_shell/local_ip.txt')
    local_ip=[]
    for line in f_ip:
        line=line.strip()
        local_ip.append(line)
    for aa in local_ip:
        kk=re.match('192.168.1|192.168.2',aa)
        if kk:
            print 'host:%s ip ok' %host
        else:
            cmd="echo 'host:%s ip error' |mail -s  ip_error 331095659@qq.com " %host
            os.system(cmd)