1\u3001LILO\u5b89\u5168\u8bbe\u7f6e<\/p>\n
vi \/etc\/lilo.conf.anaconda \/\/\u4fee\u6539LILO\u6587\u4ef6===============================================<\/p>\n
\u2026\u2026<\/p>\n
restricted \/\/\u52a0\u5165\u8fd9\u884c<\/p>\n
password=111111 \/\/\u52a0\u5165\u8fd9\u884c\u5e76\u8bbe\u7f6e\u5bc6\u7801\u4e3a111111<\/p>\n
\u2026\u2026<\/p>\n
================================================<\/p>\n
chmod 600 \/etc\/lilo.conf.anaconda \/\/\u8bbe\u7f6e\u4e3aROOT\u6743\u9650\u8bfb\u53d6<\/p>\n
\/sbin\/lilo -v \/\/\u66f4\u65b0\u7cfb\u7edf\uff0c\u4f7f\u4e0a\u8ff0\u64cd\u4f5c\u751f\u6548<\/p>\n
chattr +i \/etc\/lilo.conf.anaconda \/\/\u8bbe\u7f6eLILO\u6587\u4ef6\u662f\u4e0d\u53ef\u5199<\/p>\n
2\u3001\u8bbe\u7f6e\u9ed8\u8ba4\u53e3\u4ee4\u548c\u5e10\u53f7\u957f\u5ea6\u4e0e\u6709\u6548\u671f<\/p>\n
vi \/etc\/login.defs \/\/\u4fee\u6539login.defs\u6587\u4ef6================================================<\/p>\n
\u2026\u2026<\/p>\n
PASS_MAX_DAYS 99999<\/p>\n
PASS_MIN_DAYS 0<\/p>\n
PASS_MIN_LEN 8 \/\/\u4fee\u6539\u7cfb\u7edf\u9ed8\u8ba4\u5bc6\u7801\u957f\u5ea6\u4e3a8\u4f4d<\/p>\n
PASS_WARN_AGE 7 \/\/\u53e3\u4ee4\u6709\u6548\u671f\u4e3a7\u5929<\/p>\n
3\u3001\u6e05\u9664\u4e0d\u8bbe\u53e3\u4ee4\u7684\u5e10\u53f7<\/p>\n
vi \/etc\/passwd \/\/\u4fee\u6539passwd\u6587\u4ef6=================================================<\/p>\n
\u2026\u2026<\/p>\n
elain::500:501:elain:\/home\/elain:\/bin\/bash<\/p>\n
\u2026\u2026<\/p>\n
\/\/\u5e10\u53f7elain \u6ca1\u6709\u8bbe\u7f6e\u53e3\u4ee4\u3002\u56e0\u4e3a\u7b2c\u4e8c\u9879\u4e3a\u7a7a\uff0c\u8bf4\u660e\u6b64\u5e10\u53f7\u65e0\u5bc6\u7801\uff0c\u8fd9\u662f\u975e\u5e38\u5371\u9669\u7684\uff0c\u5e94\u8be5\u5c06\u6b64\u7c7b\u5e10\u53f7\u5220\u9664\u6216\u7ed9\u5b83\u8bbe\u7f6e\u53e3\u4ee4\u3002<\/p>\n
4\u3001\u7279\u522b\u7684\u5e10\u53f7\u5904\u7406<\/p>\n
\u5220\u9664\u65e0\u7528\u7684\u7528\u6237\u548c\u7ec4\u7528\u6237<\/p>\n
\u547d\u4ee4\u5982\u4e0b\uff1a<\/p>\n
\u5220\u9664\u7528\u6237 \uff1auserdel username<\/p>\n
\u5220\u9664\u7ec4\u7528\u6237:groupdel groupname<\/p>\n
\u5220\u9664\u4e0b\u5217\u7684\u7528\u6237\uff1a<\/p>\n
adm<\/p>\n
lp<\/p>\n
sync<\/p>\n
shutdown<\/p>\n
halt<\/p>\n
mail<\/p>\n
————–<\/p>\n
news<\/p>\n
uucp<\/p>\n
operator<\/p>\n
games \/\/\u82e5\u6ca1\u6709MAIL\u670d\u52a1\u5668\u53ef\u5220\u9664<\/p>\n
————–<\/p>\n
gopher \/\/\u82e5\u6ca1\u6709X Windows\u670d\u52a1\u5668\u53ef\u5220\u9664<\/p>\n
ftp \/\/\u82e5\u4e0d\u5141\u8bb8\u533f\u540d\u8bbf\u95eeFTP\u5220\u9664\u6b64\u5e10\u53f7<\/p>\n
5\u3001\u6743\u9650\u4e0e\u6587\u4ef6\u7cfb\u7edf<\/p>\n
lsattr \/\/\u5217\u51fa\u6587\u4ef6\u7684\u5c5e\u6027<\/p>\n
chattr \/\/\u6539\u53d8\u6587\u4ef6\u7684\u5c5e\u6027<\/p>\n
a \/\/\u53ea\u53ef\u6dfb\u52a0\u5c5e\u6027<\/p>\n
i \/\/\u4e0d\u53ef\u6539\u53d8\u5c5e\u6027<\/p>\n
\u4fee\u6539\u7cfb\u7edf\u4e2d\u5173\u952e\u6587\u4ef6\u5982\u4e0b\uff1a<\/p>\n
passwd<\/p>\n
passwd._<\/p>\n
shadow<\/p>\n
shadown._<\/p>\n
xinetd.conf<\/p>\n
services<\/p>\n
lilo.conf\u7b49<\/p>\n
\u4f8b\uff1achmod 600 \/etc\/xinetd.conf \/\/\u4fee\u6539\u6587\u4ef6\u5c5e\u4e3b\u4e3aroot<\/p>\n
chattr +(-)i \/etc\/xinetd.conf \/\/\u8bbe\u7f6e\u4e3a\u4e0d\u80fd(\u53d6\u6d88)\u4fee\u6539<\/p>\n
6\u3001\u9650\u5236\u7cfb\u7edf\u4f7f\u7528\u8d44\u6e90<\/p>\n
vi \/etc\/security\/limits.conf<\/p>\n
=================================================<\/p>\n
\u2026\u2026<\/p>\n
\u52a0\u5165\u6216\u4fee\u6539\u4e0b\u9762\u8fd9\u51e0\u884c\uff1a<\/p>\n
*hard core 0 \/\/\u7981\u6b62\u521b\u5efacore\u6587\u4ef6<\/p>\n
*hard rss 5000 \/\/\u9664root\u5916\uff0c\u5176\u5b83\u7528\u6237\u5185\u5b58\u4f7f\u7528\u4e3a5M<\/p>\n
*hard nproc 20 \/\/\u9650\u5236\u6700\u591a\u8fdb\u7a0b\u4e3a20<\/p>\n
vi \/etc\/pam.d\/login<\/p>\n
=================================================<\/p>\n
\u2026\u2026<\/p>\n
session required \/lib\/security\/pam_limits.so<\/p>\n
\/\/\u5728\u6587\u4ef6\u672b\u5c3e\u52a0\u5165\u4e0a\u9762\u8fd9\u4e00\u884c<\/p>\n
7\u3001\u8bbe\u7f6e\u81ea\u52a8\u6ce8\u9500\u5e10\u53f7\u7684\u767b\u5f55<\/p>\n
vi \/etc\/profile<\/p>\n
===================================================<\/p>\n
\u2026\u2026<\/p>\n
HOSTNAME=’\/bin\/hostname’<\/p>\n
HISTSIZE=1000 \/\/\u8fd9\u662f\u5386\u53f2\u8bb0\u5f55\u6570\uff0c\u8d8a\u5c0f\u8d8a\u597d<\/p>\n
tmout=300 \/\/\u6dfb\u52a0\u6b64\u884c\uff0c\u8868\u793a\u7cfb\u7edf\u5728\u4e94\u5206\u949f\u5185\u6ca1\u6709\u4efb\u4f55\u64cd\u4f5c\uff0c\u5c06\u81ea\u52a8\u8fd9\u4e2a\u5e10\u53f7\u6ce8\u9500<\/p>\n
8\u3001\/etc\/securetty\u6587\u4ef6\u5b89\u5168\u8bbe\u7f6e<\/p>\n
vi \/etc\/securetty<\/p>\n
====================================================<\/p>\n
tty1<\/p>\n
#tty2<\/p>\n
\u2026\u2026<\/p>\n
#tty11 \/\/\u5728\u9ed8\u8ba4\u7684\u5185\u5bb9\u4e2d\u6ce8\u91ca\u6389\u9664tty1\u5916\u7684\u6240\u6709tty\uff0c\u8868\u793aroot\u53ea\u80fd\u5728tty1\u7ec8\u7aef\u767b\u5f55<\/p>\n
9\u3001\u7981\u6b62\u5916\u6765PING\u8bf7\u6c42\uff0c\u9632\u6b62\u8865\u653b\u51fb<\/p>\n
vi \/etc\/rc.d\/rc.local<\/p>\n
====================================================<\/p>\n
echo 1>\/proc\/sys\/net\/ipv4\/icmp_echo_ignore_all<\/p>\n
\/\/\u6dfb\u52a0\u4e0a\u9762\u4e00\u884c\uff0c\u53ef\u963b\u6b62\u7cfb\u7edf\u54cd\u5e94\u4efb\u4f55\u5916\u6765\u7684PING\u8bf7\u6c42<\/p>\n
10\u3001\u9650\u5236\u663e\u793a\u51fa\u7cfb\u7edf\u7248\u672c\u4fe1\u606f<\/p>\n
\u5f53\u7528\u6237\u8fdb\u5165LINUX\u7cfb\u7edf\u65f6\u7cfb\u7edf\u5c06\u544a\u8bc9\u7528\u6237LINUX\u7248\u672c\u53f7\uff0c\u5185\u6838\u7248\u672c\u53f7\u548c\u670d\u52a1\u5668\u4e3b\u673a\u540d\u3002<\/p>\n
vi \/etc\/rc.d\/rc.local<\/p>\n
=====================================================<\/p>\n
\u5728\u91cc\u9762\u6dfb\u52a0\u5982\u4e0b\uff1a<\/p>\n
\u2026\u2026<\/p>\n
#This will overwrite \/etc\/issue at every boot.So,make any changesyou<\/p>\n
#want to make to \/etc\/issue here oryou will lose them when you reboot.<\/p>\n
#echo””> \/etc\/issue<\/p>\n
#echo”$R”>> \/etc\/issue<\/p>\n
#echo”Kernel $(uname -r)on$a $(uname -m)”>>\/etc\/issue<\/p>\n
#<\/p>\n
#cp -f \/etc\/issue \/etc\/issue.net<\/p>\n
#echo >>\/etc\/issue<\/p>\n
\u2026\u2026<\/p>\n
\u7136\u540e\uff0c\u6267\u884c\u4e0b\u9762\u51e0\u884c\u547d\u4ee4<\/p>\n
#rm -f \/etc\/issue<\/p>\n
#rm -f \/etc\/issue.net<\/p>\n
#touch \/etc\/issue<\/p>\n
#touch \/etc\/issue.net<\/p>\n
\u4e5f\u53ef\u4ee5\u5355\u72ec\u7f16\u8f91\u4e00\u4e2a\u547d\u4ee4(telnet)\uff0c\u5982\u4fee\u6539\/etc\/inetd.conf<\/p>\n
telnet stream tcp nowait root \/usr\/sbin\/tcpd in.telnetd -h<\/p>\n
\u8fd9\u6837\uff0c\u7528\u6237TELNET\u670d\u52a1\u5668\u65f6\uff0c\u5c31\u4e0d\u4f1a\u663e\u793a\u51fa\u7cfb\u7edf\u7248\u672c\u4fe1\u606f\u7b49\u4e86\uff0c\u53ea\u663e\u793a\u201clogin:\u201d\u3002<\/p>\n
11\u3001\u8bbe\u7f6e\u6587\u4ef6\/etc\/host.conf,\u9632\u6b62IP\u6b3a\u9a97<\/p>\n
vi \/etc\/host.conf<\/p>\n
===================================================<\/p>\n
\u2026\u2026<\/p>\n
#Lookup names via DNS first then fall back to \/etc\/hosts.<\/p>\n
order bind,hosts<\/p>\n
#We don’t have machines with multipe IP addresses on the same card<\/p>\n
(likevirtual server,IP Aliasing).<\/p>\n
multi off<\/p>\n
#Chesk for IP address spoofing.<\/p>\n
nospoof on<\/p>\n
IP Spoofing:IP-Spoofing is a security exploit that works by trichking<\/p>\n
computers in a trust relationship that you are someone that you really aren.<\/p>\n
\/\/\u6dfb\u52a0\u4e0a\u9762\u51e0\u884c\u6765\u9632\u6b62IP\u6b3a\u9a97\u653b\u51fb<\/p>\n
12\u3001\u7981\u6b62su\u4f5c\u4e3aroot<\/p>\n
vi \/etc\/pam.d\/su<\/p>\n
======================================================<\/p>\n
\u2026\u2026<\/p>\n
auth sufficient \/lib\/security\/pam_rootok.so debug<\/p>\n
auth required \/lib\/security\/pam_wheel.so group=elain<\/p>\n
\u5728\u6587\u4ef6\u5185\u6dfb\u52a0\u5982\u4e0a\u4e24\u884c\uff0c\u8fd9\u8868\u793a\u53ea\u6709\u7528\u6237\u7ec4elain\u91cc\u7684\u6210\u5458\u53ef\u4ee5\u7528su\u4f5c\u4e3aroot<\/p>\n
\u82e5\u5e0c\u671b\u7528\u8bb0admin\u80fdsu\u4f5c\u4e3aroot\uff0c\u53ef\u8fd0\u884c\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n
#usermod -G10 admin<\/p>\n
13\u3001\u7981\u6b62\u4f7f\u7528CTRL+ALT+DEL\u91cd\u542f\u670d\u52a1\u5668<\/p>\n
vi \/etc\/inittab<\/p>\n
\u2026\u2026<\/p>\n
#ca::ctrlaltdel:\/sbin\/shutdown -t3 -r now \/\/\u7528\u201c#\u201d\u6ce8\u91ca\u6389\u6b64\u884c\u5373\u53ef<\/p>\n
\u7136\u540e\u8fd0\u884c\uff1a<\/p>\n
#\/sbin\/init -q<\/p>\n
14\u3001\u6ce8\u9500\u65f6\u5220\u9664\u547d\u4ee4\u8bb0\u5f55<\/p>\n
vi \/etc\/skel\/.bash_logout<\/p>\n
============================================================<\/p>\n
rm -f $HOME\/.bash_history<\/p>\n
15\u3001\u786e\u4fdd\u5f00\u542f\u7684\u670d\u52a1\u5b89\u5168<\/p>\n
\u5e38\u7528\u670d\u52a1\u65b9\u9762\u7684\u547d\u4ee4\uff1a<\/p>\n
grep -v “#” \/etc\/services \/\/\u663e\u793a\u6ca1\u6709\u88ab\u6ce8\u91ca\u6389\u7684\u670d\u52a1<\/p>\n
ps -eaf|wc -l \/\/\u7edf\u8ba1\u5f53\u524d\u7cfb\u7edf\u6253\u5f00\u670d\u52a1\u7684\u603b\u6570<\/p>\n
netstat -na (\u8fdc\u7a0b\u540e\u9762\u53ef\u52a0ip) \/\/\u67e5\u770b\u5f53\u524d\u8fd0\u884c\u7684\u670d\u52a1<\/p>\n
netstat -an |grep LISTEN \/\/\u67e5\u770b\u662f\u5426\u6709\u53ef\u7591\u7aef\u53e3\u6253\u5f00<\/p>\n
\u5f53\u7136\uff0c\u4e5f\u53ef\u4ee5\u6267\u884c\u5982\u4e0b\u547d\u4ee4\uff1a<\/p>\n
shattr +i \/etc\/services \/\/\u8bbe\u7f6e\u4e3a\u4e0d\u53ef\u7406\u6027\u5c5e\u6027<\/p>\n
Linux\u542f\u52a8\u65f6\u5148\u68c0\u6d4b\u811a\u672c\u6587\u4ef6\uff0c\u5728REDHAT\u4e0b\uff0c\u5728\/etc\/rc.d\/rc3.d(rc5.d)\u4e0b(\u56fe\u5f62\u5316)\uff0c\u811a\u672c\u540d\u5b57\u4e3a\u542f\u52a8\u987a\u5e8f\u3002<\/p>\n
K \u8868\u793a\u6740\u6b7b\u8fdb\u7a0b<\/p>\n
S \u8868\u793a\u542f\u52a8\u7684\u670d\u52a1<\/p>\n
\u5982\u5728\u542f\u52a8\u65f6\u7981\u6b62\u4e00\u4e2a\u670d\u52a1\uff0c\u53ea\u9700\u628a\u8be5\u670d\u52a1\u7684\u811a\u672c\u6587\u4ef6\u7684\u5927\u5199\u201cS\u201d\u66f4\u6539\u4e3a\u5c0f\u5199\u201cs\u201d<\/p>\n
\u6ce8\u610f\uff0c\u4ee5\u4e0b3\u4e2a\u670d\u52a1\u6f0f\u6d1e\u5f88\u591a\uff0c\u5f3a\u70c8\u5efa\u8bae\u5173\u95ed<\/p>\n
yppasswdd(NIS\u670d\u52a1\u5668)<\/p>\n
ypserv(NIS\u670d\u52a1\u5668)<\/p>\n
nfs(NFS\u670d\u52a1\u5668)<\/p>\n
16\u3001LINUX\u9632\u706b\u5899\u5b89\u5168\u914d\u7f6e<\/p>\n
system-config-securitylevel<\/p>\n
17\u3001LINUX\u7cfb\u7edf\u5b89\u5168\u5de5\u5177<\/p>\n
Sxid:\u68c0\u67e5\u7cfb\u7edf\u4e2d\u7684suid,sgid\u4ee5\u53ca\u6ca1\u6709\u4e3b\u4eba\u7684\u6587\u4ef6<\/p>\n
Skey:\u4e00\u6b21\u6027\u53e3\u4ee4\u5de5\u5177<\/p>\n
Logrotate:\u65e5\u5fd7\u5faa\u73af\u5de5\u5177<\/p>\n
Logcheck:\u65e5\u5fd7\u7ba1\u7406\u5de5\u5177<\/p>\n
Swatch\uff1a\u65e5\u5fd7\u7ba1\u7406\u5de5\u5177\uff0c\u6bd4logcheck\u5b9e\u65f6<\/p>\n
Ssh(openssh):\u63d0\u4f9b\u5b89\u5168\u7684\u8fde\u63a5\u8ba4\u8bc1<\/p>\n
Portsentry:\u53cd\u626b\u63cf\u5de5\u5177\uff0c\u76d1\u89c6\u81ea\u5df1\u7684udp\u548ctcp\u7aef\u53e3<\/p>\n
Tripwire:\u63d0\u4f9b\u7cfb\u7edf\u5b8c\u6574\u6027\u68c0\u67e5<\/p>\n
Gnupg:\u5bf9\u5355\u4e2a\u6587\u4ef6\u8fdb\u884c\u52a0\u5bc6\u4ee5\u53ca\u521b\u5efa\u6570\u5b57\u7b7e\u540d<\/p>\n
Hostsentry:\u57fa\u4e8e\u4e3b\u673a\u7684\u5165\u4fb5\u68c0\u6d4b\uff0c\u5c06\u8fde\u63a5\u8bb0\u5165\u65e5\u5fd7<\/p>\n
ipchains Linux:\u53d1\u884c\u7248\u81ea\u5e26\u7684\u5305\u8fc7\u6ee4\u5f62\u9632\u706b\u5899<\/p>\n
Anti-sniff:\u53cd\u55c5\u63a2\u5de5\u5177\uff0c\u68c0\u67e5\u7f51\u7edc\u4e2d\u662f\u5426\u6709\u55c5\u63a2\u5668<\/p>\n
Freeswan:\u5728LINUX\u4e2d\u5b9e\u73b0VPN\u7684\u5de5\u5177<\/p>\n
Syslog-ng:\u66ff\u4ee3syslog\u7684\u65e5\u5fd7\u6587\u4ef6\u7cfb\u7edf<\/p>\n
Scandns:\u8fdb\u884cDNS\u68c0\u67e5\u8ffd\u8e2a\u5de5\u5177<\/p>\n
Whisker\uff1aCGI\u626b\u63cf\u5668<\/p>\n
Snoopy:\u901a\u8fc7\u8ddf\u8e2aexecve\u7cfb\u7edf\u8c03\u7528\u8bb0\u5f55\u6587\u4ef6\u7684\u547d\u4ee4<\/p>\n
Krnsniff\uff1a\u4e00\u4e2a\u57fa\u4e8e\u5185\u6838\u7684\u76d1\u542c\u6a21\u5757<\/p>\n
Iptable:\u7528\u6765\u66ff\u4ee3ipchains\u5305\u8fc7\u6ee4\u9632\u706b\u5899<\/p>\n
Imsafe:\u901a\u8fc7\u8ddf\u8e2a\u7cfb\u7edf\u8c03\u7528\u6765\u68c0\u6d4b\u7f13\u51b2\u6ea2\u51fa\u7b49\u95ee\u9898<\/p>\n
Iplog:\u5bf9\u6765\u5f80\u7684\u5305\u8fdb\u884c\u65e5\u5fd7\u8bb0\u5f55<\/p>\n
Solaris designer:\u5185\u6838\u8865\u4e01\uff0c\u9632\u6b62\u7f13\u51b2\u6ea2\u51fa\u7b49<\/p>\n
Stackguard:\u4f5c\u4e3a\u8865\u4e01\u4fee\u8865GCC\uff0c\u9632\u6b62\u7f13\u51b2\u6ea2\u51fa<\/p>\n
DTK:Honey port\u6b3a\u9a97\u5f0f\u9632\u5fa1<\/p>\n
Antiroute:\u963b\u6b62\u548c\u8bb0\u5f55\u57fa\u4e8e\u8def\u7531\u7684\u8ddf\u8e2a<\/p>\n
===========================================================<\/p>\n
\u6ce8\uff1a\u4ee5\u4e0a\u8d44\u6599\u5747\u6536\u96c6\u4e8e\u7f51\u7edc\uff0c\u7248\u6743\u5f52\u539f\u4f5c\u8005\u6240\u6709\uff0c\u672c\u4eba\u53ea\u662f\u5728\u5b66\u4e60\u65f6\u603b\u7ed3\u89c4\u7eb3\u4e86\u4e00\u4e0b\uff0c\u5e0c\u671b\u5bf9LINUX\u5b89\u5168\u7231\u597d\u8005\u6709\u6240\u5e2e\u52a9\uff01<\/p>\n
\u672c\u6587\u51fa\u81ea \u201celain\u7684\u6280\u672f\u535a\u5ba2\u201d \u535a\u5ba2<\/p>\n","protected":false},"excerpt":{"rendered":"
1\u3001LILO\u5b89\u5168\u8bbe\u7f6e vi \/etc\/lilo.conf.anaconda \/\/ …<\/p>\n