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Article #390

快速建立一个入侵检测系统

#390
From: NewBlue
Date: Thu, 16 Oct 2003 08:48
187 lines
9394 bytes
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http://secu.zzu.edu.cn 


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�������linux+snort,��Ϊ���Ƕ�����ѵ�,���Ҳ���Դ���װ������� 
libpcap http://www.tcpdump.org 

snort-1.9 http://www.snort.org 
�����������rootȨ�� 
su 
passwd:**********

����snort��Ҫlibpcap,�����Ȱ�װ��

cd /usr/src 
tar zxvf libpcap-0.6.2.tar.gz 
tar zxvf snort-1.9.0.tar.gz 
[root@SEC src]# cd libpcap-0.6.2 
[root@SEC libpcap-0.6.2]# ./configure --prefix=/usr/local/libpcap-0.6.2 
[root@SEC libpcap-0.6.2]#make 
[root@SEC libpcap-0.6.2]#make install 

���Ű�װsnort�������Ҫ����־д��mysql��ݿ�Ļ������úܼ�

[root@SEC libpcap-0.6.2]#cd ../snort-1.9.0 
[root@SEC snort-1.9.0]#./configure --prefix=/usr/local/snort19 
[root@SEC snort-1.9.0]#make 
[root@SEC snort-1.9.0]#make install

OK,��װ��ϣ������������װ����г����κδ�����鿴README�ļ� 
���ţ��ѵ�ǰĿ¼�µ�etcĿ¼��rulesĿ¼cp��snort�İ�װĿ¼

[root@SEC snort-1.9.0]#cp etc /usr/local/snort19 -r 
[root@SEC snort-1.9.0]#cp rules /usr/local/snort19 -r

���ţ���etc�µ�classification.config���Ƶ�/root/Ŀ¼�� 
�ٰ�etc�����snort.conf���Ƶ�rootĿ¼�²�����Ϊ.snortrc
 
[root@SEC snort-1.9.0]#cp etc/classification.config /root/ 
[root@SEC snort-1.9.0]#cp etc/snort.conf /root/.snortrc

���ڱ༭snort�������ļ�.snortrc

vi /root/.snortrc

����102���ҵ�var RULE_PATH ../rules 
����ij�var RULE_PATH /usr/local/snort19/rules 
Ȼ����590�п���

include $RULE_PATH/bad-traffic.rules

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��ϣ�

����Ϊ�˷��㣬���ǰ�snort�Ŀ�ִ�г�����/usr/sbinĿ¼

[root@SEC snort-1.9.0]#cp /usr/local/snort19/bin/snort /usr/sbin/snort

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[root@SEC snort-1.9.0]#mkdir /var/log/snort

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[root@SEC snort-1.9.0]#snort 
Initializing Output Plugins! 
Log directory = /var/log/snort 

Initializing Network Interface eth0 
using config file /root/.snortrc 
Initializing Preprocessors! 
Initializing Plug-ins! 
Parsing Rules file /root/.snortrc

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[root@SEC snort-1.9.0]# snort --help 
Initializing Output Plugins! 
snort: invalid option -- - 

-*> Snort! <*- 
Version 1.9.0 (Build 209) 
By Martin Roesch (roesch@sourcefire.com, www.snort.org) 
USAGE: snort [-options] 
Options: 
-A Set alert mode: fast, full, console, or none (alert file alerts only) 
"unsock" enables UNIX socket logging (experimental). 
-a Display ARP packets 
-b Log packets in tcpdump format (much faster!) 
-c Use Rules File 
-C Print out payloads with character data only (no hex) 
-d Dump the Application Layer 
-D Run Snort in background (daemon) mode 
-e Display the second layer header info 
-f Turn off fflush() calls after binary log writes 
-F Read BPF filters from file 
-g Run snort gid as group (or gid) after initialization 
-G Add reference ids back into alert msgs (modes: basic, url) 
-h Home network = 
-i Listen on interface 
-I Add Interface name to alert output 
-l Log to directory 
-m Set umask = 
-n Exit after receiving packets 
-N Turn off logging (alerts still work) 
-o Change the rule testing order to Pass|Alert|Log 
-O Obfuscate the logged IP addresses 
-p Disable promiscuous mode sniffing 
-P set explicit snaplen of packet (default: 1514) 
-q Quiet. Don't show banner and status report 
-r Read and process tcpdump file 
-R Include 'id' in snort_intf.pid file name 
-s Log alert messages to syslog 
-S Set rules file variable n equal to value v 
-t 
Chroots process to 
after initialization 
-T Test and report on the current Snort configuration 
-u Run snort uid as user (or uid) after initialization 
-U Use UTC for timestamps 
-v Be verbose 
-V Show version number 
-w Dump 802.11 management and control frames 
-X Dump the raw packet data starting at the link layer 
-y Include year in timestamp in the alert and log files 
-z Set assurance mode, match on established sesions (for TCP) 
-? Show this information 
are standard BPF options, as seen in TCPDump 

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-A ���ñ���ģʽ���ǿ��٣���ȫ�������ǿ���̨������Dz����� 
-a ����ARP�� 
-b ʹ��tcpdump�ĸ�ʽ��д����־ 
-c ָ�������ļ�·�� 
-d ����Ӧ�ò���� 
-D ��̨����snort 
-e ��ʾ�ڶ���ͷ��Ϣ 
-h ���ü������� 
-m �������� 
-z ֻƥ���Ѿ���ȫ�������ӵĻỰ 

��һ����ʹ�� 
snort -A fast -Db -e -z������snort�� 
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�����Ҫ֪����Ӷ����Ϣ������ȥwww.snort.org��doc�����߿�man page 

�����Ƚ�ȡһ����־Ƭ����˵��һЩ���� 
11/13-05:29:27.429801 UDP src: 24.24.146.64 dst: 202.196.64.30 sport: 1028 dport: 137 tgts: 6 ports: 6 event_id: 0 
11/13-05:29:27.759801 UDP src: 24.24.146.64 dst: 202.196.64.32 sport: 1028 dport: 137 tgts: 7 ports: 7 event_id: 471 
11/13-05:29:34.279801 UDP src: 24.24.146.64 dst: 202.196.64.72 sport: 1028 dport: 137 tgts: 8 ports: 8 event_id: 471 
11/13-05:29:34.449801 UDP src: 24.24.146.64 dst: 202.196.64.73 sport: 1028 dport: 137 tgts: 9 ports: 9 event_id: 471 
11/13-05:29:37.549801 UDP src: 24.24.146.64 dst: 202.196.64.92 sport: 1028 dport: 137 tgts: 10 ports: 10 event_id: 471 
11/13-05:29:41.989801 UDP src: 24.24.146.64 dst: 202.196.64.119 sport: 1028 dport: 137 tgts: 11 ports: 11 event_id: 471 
11/13-05:29:42.139801 UDP src: 24.24.146.64 dst: 202.196.64.120 sport: 1028 dport: 137 tgts: 12 ports: 12 event_id: 471 

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11/13-05:29:27.429801 UDP src: 24.24.146.64 dst: 202.196.64.30 sport: 1028 dport: 137 tgts: 6 ports: 6 event_id: 0 

UDP��ʹ�õ�Э�� 
SRC��ԴIP 
DST��Ŀ��IP 
SPORT��Դ�˿� 
DPORT��Ŀ��˿� 
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http://secu.zzu.edu.cn/modules.php?name=Sections&op=viewarticle&artid=25
-- 
NewBlue
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From: NewBlue <NewBlue@yaako.com>
Newsgroups: cn.comp.os.linux,cn.comp.hacker,cn.comp.security,cn.comp
Subject: 快速建立一个入侵检测系统
Date: Thu, 16 Oct 2003 16:48:40 +0800
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