ENSURE that the owner is root.

[root@deep]# stat /etc/inetd.conf

File: "/etc/inetd.conf"

Size: 2869 Filetype: Regular File

Mode: (0600/-rw-------) Uid: ( 0/ root) Gid: ( 0/ root)

Device: 8,6 Inode: 18219 Links: 1

Access: Wed Sep 22 16:24:16 1999(00000.00:10:44)

Modify: Mon Sep 20 10:22:44 1999(00002.06:12:16)

Change:Mon Sep 20 10:22:44 1999(00002.06:12:16)

编辑/etc/inetd.conf禁止以下服务：

ftp, telnet, shell, login, exec, talk, ntalk, imap, pop-2, pop-3, finger,

auth, etc. 除非你真的想用它。

特别是禁止那些r命令.如果你用ssh/scp，那么你也可以禁止掉telnet/ftp。

为了使改变生效，运行#killall -HUP inetd

你也可以运行#chattr +i /etc/inetd.conf使该文件具有不可更改属性。

只有root才能解开，用命令

#chattr -i /etc/inetd.conf

7. TCP_WRAPPERS

默认地，Redhat Linux允许所有的请求,用TCP_WRAPPERS增强你的站点的安全性是举手

之劳，你可以放入

“ALL: ALL”到/etc/hosts.deny中禁止所有的请求，然后放那些明确允许的请求到

/etc/hosts.allow中，如:

sshd: 192.168.1.10/255.255.255.0 gate.openarch.com

对IP地址192.168.1.10和主机名gate.openarch.com，允许通过ssh连接。

配置完了之后，用tcpdchk检查

[root@deep]# tcpdchk

tcpchk是TCP_Wrapper配置检查工具，

它检查你的tcp wrapper配置并报告所有发现的潜在/存在的问题。

8. 别名文件aliases

编辑别名文件/etc/aliases（也可能是/etc/mail/aliases)，移走/注释掉下面的行。

# Basic system aliases -- these MUST be present.

MAILER-DAEMON: postmaster

postmaster: root

# General redirections for pseudo accounts.

bin: root

daemon: root

#games: root ?remove or comment out.

#ingres: root ?remove or comment out.

nobody: root

#system: root ?remove or comment out.

#toor: root ?remove or comment out.

#uucp: root ?remove or comment out.

# Well-known aliases.

#manager: root ?remove or comment out.

#dumper: root ?remove or comment out.

#operator: root ?remove or comment out.

# trap decode to catch security attacks

#decode: root

# Person who should get root''s mail (责任编辑：IT)