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  Snort ¼³Ä¡ ¹× ¼¼Æà ÀÛ¼ºÀÏ : 2003/10/01 00:17
 
  • ±Û¾´ÀÌ : sin ( http://chtla.com/ )
  • Á¶È¸¼ö : 9462
          [ ÀÌÀüÈ­¸é / ¼öÁ¤ ]   ºñ¹Ð¹øÈ£ :     Àμâ¿ë È­¸é
      ÀÛ¼ºÀÚ : sin, http://chtla.com/ ÃʽÉÀ¸·Î..(¸®´ª½º Ä¿¹Â´ÏƼ)

    Snort´Â ³×Æ®¿öÅ© ĨÀÔ Å½Áö ½Ã½ºÅÛÀ¸·Î ½Ç½Ã°£ Æ®·¡ÇÈ ºÐ¼®°ú, IP ³×Æ®¿öÅ©¿¡¼­ÀÇ ÆÐŶ ó¸®ÀÛ¾÷À» ó¸®ÇÏ´Â µ¥¸óÀÌ´Ù.
    ±×¸®°í ÇÁ·ÎÅäÄÝ ºÐ¼®, ÄÁÅÙÃ÷ °Ë»ö/Á¶ÇÕ ÀÛ¾÷À» ÇÒ ¼ö ÀÖÀ¸¸ç, buffer overflows, stealth port scans, CGI attacks, SMB probes, OS fingerprinting attempts°ú °°Àº ´Ù¾çÇÑ °ø°ÝÀ» °¨ÁöÇÒ ¼öµµ ÀÖ´Ù.
    ¶ÇÇÑ Snort´Â À¯¿¬ÇÑ languageÀÇ »ç¿ëÀ¸·Î trafficÀ» ºÐ¼®ÇÏ¸ç ¸ðµâÈ­µÈ ŽÁö ¿£ÁøÀ» Áö¿øÇÏ°í ½Ç½Ã°£ °æ°í ±â´Éµµ Áö¿øÇϴµî
    ´Ù¾çÇÏ°í º¹ÀâÇÑ Ä§ÀÔ Å½Áö°¡ °¡´ÉÇÏ´Ù..
    (±×·± ¸¸Å­ ¼³Á¤µî »ç¿ëÀÌ º¹ÀâÇØ Áø´Ù..)

    ´ÜÁ¡ :
    TCP ½ºÆ®¸² ÀçÁ¶ÇÕ(reassembly)À» Áö¿øÇÏÁö ¾Ê½À´Ï´Ù. µû¶ó¼­ ¸ðµç ½Ã±×³ÊÃÄ ºÐ¼®Àº ÆÐŶ ´ÜÀ§·Î ÇàÇØ Áý´Ï´Ù. whisker µîÀÇ ÅøµéÀº ÀÌ·¯ÇÑ ºÐ¼®¹ýÀ» ¿ìȸÇÒ ¼ö ÀÖ´Â ¸ÞÄ«´ÏÁòÀ» °®°í ÀÖ½À´Ï´Ù.
    TCP ½ºÆ®¸²À» ÀçÁ¶ÇÕÇϸé ÆÐŶ ºÐ¼® È¿À²ÀÌ ¶³¾îÁö°Ô µË´Ï´Ù. È¿À² ÀúÇϸ¦ ÃÖ¼ÒÈ­ Çϸ鼭 TCP ½ºÆ®¸²À» ÀçÁ¶ÇÕÇÏ°í ºÐ¼®ÇÏ´Â °ÍÀº Èûµç ÀÛ¾÷ÀÔ´Ï´Ù.

    IP Á¶°¢ ÆÐŶ(fragmented packet)¿¡ ´ëÇؼ­ ÀçÁ¶ÇÕÀ» ÇÒ ¼ö ¾ø½À´Ï´Ù. ´ë½Å minfrag¶ó´Â ·ê ¿É¼ÇÀ» »ç¿ëÇÏ¿© ÆÐŶ Á¶°¢ÀÇ ÃÖ¼Ò Å©±â¸¦ ÁöÁ¤ÇÒ ¼ö ÀÖ½À´Ï´Ù. »ç¿ë ³×Æ®¿öÅ© Àåºñ Áß¿¡ 256byte ÀÌÇÏ Å©±âÀÇ ÆÐŶÀ» Á¶°¢È­(fragmentation)ÇÏ´Â °æ¿ì´Â ¾øÀ¸¹Ç·Î minfrag¸¦ ÀÌ °ª, 256À¸·Î ÁöÁ¤Çϸé ÃæºÐÈ÷ °ø°ÝÀ» Àâ¾Æ ³¾ ¼ö ÀÖ´Ù°í ÇÕ´Ï´Ù. ÇÏÁö¸¸ ¿©ÀüÈ÷ ´ÜÁ¡¿¡ ¼ÓÇÕ´Ï´Ù.

    ·Î±× ±â´ÉÀÌ ¾àÇÕ´Ï´Ù. Á¦´ë·Î ¼¼¼¼ÇÑ ³»¿ëÀÇ ·Î±×¸¦ »ý¼ºÇØ ³»±â´Â ÇÏÁö¸¸ ´©±¸³ª ±×·¯ÇÑ ·Î±×¸¦ º¸°í »óȲÀ» ÆľÇÇϱ⿡´Â ·Î±× ½Ã½ºÅÛÀÌ ³Ê¹« ¾àÇÏ´Ù´Â ´À³¦ÀÌ ÀÖ½À´Ï´Ù

    4¿ù 22ÀÏ Ãß°¡³»¿ë) ========================================
    Snort ÀÇ Stream4 (TCP) Integer Overflow Ãë¾àÁ¡ÀÌ 4¿ù18ÀÏ ¹ß°ßµÇ¾ú½À´Ï´Ù.
    Snort 2.0.0 beta ¹öÁ¯, Snort 1.9.x, Snort 1.8.x ¼³Ä¡½Ã ¼­ºñ½º°ÅºÎ°ø°Ý(DoS)
    °ø°ÝÀ» ÀÏÀ¸Å³ ¼ö ÀÖÀ¸¸ç, ¿ø°Ý¿¡¼­ ¸í·É¾î¸¦ ½ÇÇà½Ãų ¼ö ÀÖ½À´Ï´Ù.
    ±×·¯´Ï ÇöÀç °¡Àå ÃֽŠ¹öÀüÀÎ 2.0À» ´Ù¿î ¹Þ¾Æ¼­ ¼³Ä¡ÇϽñ⠹ٶø´Ï´Ù.

    º¸´Ù ÀÚ¼¼ÇÑ ³»¿ëÀº ¾Æ·¡ ¸µÅ©¸¦ ÂüÁ¶ÇϽñ⠹ٶø´Ï´Ù.
    http://chtla.com/viewtopic.php?t=106
    ====================================================


    ´Ù¿î : http://www.snort.org ÃֽŠ¹öÀü ´Ù¿î (ÇöÀç ÃֽŠ¹öÀü snort-1.8.7)
    ÂüÁ¶ »çÀÌÆ® : http://www.certcc.or.kr/tools/Snort.html

    [root@kan up]# rpm -qa|grep libpcap
    libpcap-0.6.2-12
    [root@kan up]# cd /home/kan/
    [root@kan up]# tar xvfz snort-1.8.7.tar.gz
    [root@kan snort-1.8.7]# ./configure
    [root@kan snort-1.8.7]# make
    [root@kan snort-1.8.7]# make install


    ============================================

    snort 1.9.1

    [root@dream snort-1.9.1]# rpm -qa|grep libcap
    libcap-1.10-12
    libcapplet0-1.4.0.1-9
    libcap-devel-1.10-12

    [root@dream snort-1.9.1]# ./configure
    ..
    checking for pcap_datalink in -lpcap... no

    ERROR! Libpcap library/headers not found, go get it from
    http://www.tcpdump.org/
    or use the --with-libpcap-* options, if you have it installed
    in unusual place

    ÀÌ·± ¸Þ¼¼Áö¿Í ÇÔ²² configure¿¡ ¿¡·¯ ¹ß»ýÇÔ..

    http://www.tcpdump.org/
    libpcap-0.7.2.tar.gz À» ´Ù¿î¹ÞÀ½..
    tar ÇØÁ¦ÈÄ
    # ./configure
    # make
    # make install
    ·Î ¸ÕÀú ¼³Ä¡¸¦ ÇÑ´Ù..

    À̹ø¿£ libpcapÀ» rpmfind.net¿¡¼­ libpcap-0.6.2-16.i386.rpm À» ´Ù¿î¹Þ¾Æ rpmÀ¸·Î ¼³Ä¡ÇÑ´Ù.

    [root@dream rpm]# rpm -Uvh libpcap-0.6.2-16.i386.rpm
    ########################################### [100%]
    1:libpcap ########################################### [100%]

    [root@dream snort-1.9.1]# ./configure
    [root@dream snort-1.9.1]# make
    [root@dream snort-1.9.1]# make install

    /usr/local/bin/snort
    /usr/local/man/man8/snort.8
    ÀÌ »ý¼ºµÊ..

    [root@dream kan]# mv snort-1.9.1 /usr/local
    [root@dream kan]# cd /usr/local/snort-1.9.1
    [root@dream snort-1.9.1]# mkdir /var/log/snort <== log¸¦ ±â·ÏÇÒ µð·ºÅ丮
    [root@dream snort-1.9.1]# vi etc/snort.conf

    var HOME_NET 211.xx.xx.xxx/32 <=======================

    ===================================
    your_ip: snort ·Î °ø°Ý´çÇÏ´Â °ÍÀ» °¨½ÃÇÒ IP ÁÖ¼Ò
    subnet: ¼­ºê³Ý ¸¶½ºÅ©¸¦ ¼³Á¤ÇÏ¿© ³×Æ®¿öÅ©¸¦ °¨½Ã
    your_ip/subnetÀ¸·Î ÁÖ¼Ò¸¦ ÁöÁ¤ÇÏ´Â ¹æ¹ýÀº ´ÙÀ½°ú °°½À´Ï´Ù.

    È£½ºÆ® À̸§À» »ç¿ëÇÒ ¼ö ¾ø°í, È£½ºÆ®³ª ³×Æ®¿öÅ©¸¦ ÁöÁ¤Çϱâ À§Çؼ­ IP ÁÖ¼Ò¿Í ¼­ºê³Ý¸¶½ºÅ©·Î Ç¥ÇöÇÕ´Ï´Ù.
    ¼­ºê³Ý¸¶½ºÅ©´Â CIDR ºí·°À» »ç¿ëÇؼ­ ÁöÁ¤ÇÕ´Ï´Ù. CIDR ºí·°Àº ¼­ºê³Ý¸¶½ºÅ©¸¦ ¼ýÀڷΠǥÇöÇÑ°ÍÀ¸·Î ÁּҺκÐÀÇ ºñÆ®¼ö¸¦ »ç¿ëÇÕ´Ï´Ù. ¿¹¸¦ µé¾î C class ³×Æ®¿öÅ©´Â /24·Î B Ŭ·¡½º(class) ³×Æ®¿öÅ©´Â /16À¸·Î ,A Ŭ·¡½º ³×Æ®¿öÅ©´Â /8·Î È£½ºÆ®¸¦ ÁöÁ¤Çϱâ À§Çؼ­´Â /32¸¦ »ç¿ëÇÕ´Ï´Ù.
    ÁÖ¼Ò ÁöÁ¤¿¡¼­ ÁÖ¼Ò ÁöÁ¤ÇÑ ºÎºÐ ¾Õ¿¡ !¸¦ »ç¿ëÇÏ¸é ±× ÁÖ¼Ò¸¦ Á¦¿ÜÇÑ ³×Æ®¿öÅ©³ª È£½ºÆ®¸¦ ÀǹÌÇÏ°Ô µË´Ï´Ù.

    ¿¹¸¦ µé¾î !192.1.1.0/24 ´Â 192.1.1.0 C Ŭ·¡½º ³×Æ®¿öÅ©¸¦ Á¦¿ÜÇÑ ³×Æ®¿öÅ©¸¦ ÀǹÌÇÏ°Ô µË´Ï´Ù.
    Ưº°È÷ any ´Â ¸ðµç IP °ø°£À» ÁöÁ¤ÇÒ ¶§ »ç¿ëµË´Ï´Ù.
    ¿¹) 10.1.1.1 È£½ºÆ®¿¡ ´ëÇÑ °ø°ÝÀ» ¸ðµÎ °¨ÁöÇÕ´Ï´Ù.
    var HOME_NET 10.1.1.1/32
    ====================================

    var EXTERNAL_NET !$HOME_NET <== home_netÀ» Á¦¿ÜÇÑ ¸ðµç ³×Æ®¿öÅ©ÀÇ È£½ºÆ®

    preprocessor portscan: $HOME_NET 4 3 /var/log/snort/portscan.log
    <== ÁÖ¼®Á¦°ÅÈÄ ÀúÀåµÉ °æ·Î¸¦ Àû¾îÁÜ..
    4 3 ´Â 4°³ÀÌ»óÀÇ Ä¿³Ø¼ÇÀÌ 3Ãʵµ¾È ¹ß»ýÇϸé Æ÷Æ® ½ºÄ³´×À¸·Î Ãë±ÞÇϰԵǴ ÀǹÌÀÓ..

    var DNS_SERVERS [211.xx.xx.xxx,16.81.63.1,168.126.63.1] <== dns¼­¹ö

    preprocessor portscan-ignorehosts: $DNS_SERVERS <== Æ÷Æ®½ºÄµ½Ã Á¦¿ÜµÉ ¾ÆÀÌÇǵé

    [root@dream log]# snort -D -d -l /var/log/snort -c /usr/local/snort-1.9.1/etc/snort.conf
    <== snort ½ÇÇà..

    -D : snort ¸¦ µ¥¸ó¸ðµå·Î ½ÇÇà½ÃÅ´
    -d : ¾ÖÇø®ÄÉÀÌ¼Ç ·¹À̾ ´ýÇÁ½ÃÅ´
    -l : ÁöÁ¤µÈ µð·ºÅ丮¿¡ ·Î±× µ¥ÀÌŸ¸¦ ÀúÀåÇÑ´Ù.
    -c : ÁöÁ¤µÈ ÆÄÀÏÀ» ·ê ÆÄÀÏ·Î »ç¿ëÇÑ´Ù.

    ½ÇÇàÈÄ /var/log/snort¸¦ º¸¸é alert¿Í portscan.log ÆÄÀÏÀÌ »ý¼ºµÈ °ÍÀ» º¼¼ö ÀÖ´Ù.

    [root@dream etc]# vi /etc/rc.d/rc.local <== ºÎÆýà ½ÇÇàÀ» À§Çؼ­..
    # snort 1.9.1
    snort -D -d -l /var/log/snort -c /usr/local/snort-1.9.1/etc/snort.conf


    ¿É¼Çµé =========================================

    USAGE: snort [-options] <filter options>

    Options:
    -A ¾ó·µ ¸ðµå¸¦ fast,full,none ÁßÀÇ Çϳª·Î ÁöÁ¤ÇÕ´Ï´Ù.
    unsock À» ÁöÁ¤Çϸé UNIX ¼ÒÄÏÀ» »ç¿ëÇÏ¿© ·Î±ëÀ» ÇÑ´Ù(¾ÆÁ÷ ½ÃÇèÀûÀ̶ó°í ÇÑ´Ù).

    -a ARP ÆÐŶÀ» ÇÁ¸°Æ®ÇÕ´Ï´Ù.
    -b ÆÐŶÀ» tcpdump ÆÄÀÏ·Î ÀúÀåÇÕ´Ï´Ù. ¹ÙÀ̳ʸ® Æ÷¸ËÀ̹ǷΠÀúÀå ¼Óµµ°¡ »¡¶óÁý´Ï´Ù.
    -c <rules> :<rules>·Î ÁöÁ¤µÈ ÆÄÀÏÀ» ·ê ÆÄÀÏ·Î »ç¿ëÇÕ´Ï´Ù.
    -C : ÆÐŶÀÇ »ç¿ëÀÚ µ¥ÀÌŸ ºÎºÐ(payload)¸¦ ¹®ÀÚ¸¸ ÇÁ¸°Æ®ÇÕ´Ï´Ù. Çí½º ÇüÅ·δ ÇÁ¸°Æ®ÇÏÁö ¾Ê½À´Ï´Ù.

    -D : snort¸¦ µ¥¸ó ¸ðµå·Î µ¹¸³´Ï´Ù. ¹Ù·Î ¹é±×¶ó¿îµå·Î µé¾î°¡°í Å͹̳ÎÀ» Á¾·áÇصµ °è¼Ó µ¹°Ô µË´Ï´Ù.

    -F <bpf> BPF ÇÊÅ͸µ½ÄÀ» <bpf>·Î ÁöÁ¤µÈ È­ÀÏ¿¡¼­ ÀÐ¾î ¿É´Ï´Ù.
    BPF ÇÊÅ͸µ½ÄÀº tcpdump¿¡¼­ ¿øÇÏ´Â ÆÐŶ ¸¸À» ´ýÇÁÇϱâ À§Çؼ­ »ç¿ëµÇ´Â ½ÄÀÔ´Ï´Ù.

    -g <gname> snortÀÇ gid¸¦ <gname>À¸·Î ±×·ìÀ¸·Î ¼³Á¤ÇÕ´Ï´Ù.
    -h <hn> Ȩ³×Æ®¿öÅ© º¯¼ö HOME_NET¸¦ <hn>ÀÇ °ªÀ¸·Î ¼¼ÆÃÇÕ´Ï´Ù.
    -i <if> : <if>·Î ÁöÁ¤µÈ ³×Æ®¿öÅ© ÀÎÅÍÆäÀ̽º¸¦ ¸ð´ÏÅ͸µÇÕ´Ï´Ù. <if> °ªÀ¸·Î eth0,eth1 µîÀÌ ¿Ã ¼ö ÀÖ½À´Ï´Ù.

    -I : ¾ó·µ °á°ú¹°¿¡ ³×Æ®¿öÅ© ÀÎÅÍÆäÀ̽º À̸§À» ºÙÀδÙ.
    -l <ld> : <ld>·Î ÁöÁ¤µÈ µð·ºÅ丮¿¡ ·Î±× µ¥ÀÌŸ¸¦ ÀúÀåÇÕ´Ï´Ù.
    -n <cnt> : <cnt> °³ÀÇ ÆÐŶ¸¸À» ¸ð´ÏÅ͸µÇÏ°í ÇÁ·Î±×·¥À» Á¾·áÇÕ´Ï´Ù.
    -N : ·Î±ë ±â´ÉÀ» »ç¿ëÇÏÁö ¾Ê½À´Ï´Ù. ¾ó·µ¸¸ÀÌ ÀúÀåµË´Ï´Ù.
    -o : ·ê¼Â Å×½ºÆ® ¼ø¼­¸¦ Pass, Alert, Log¼ø¼­·Î ¹Ù²Û´Ù.
    -O : IPÁÖ¼Ò¸¦ ¾Ë ¼ö ¾øµµ·Ï Ç¥½ÃÇÑ´Ù.
    -p : ¹«ÀÛÀ§ ¸ðµå(promiscuous mode)¸¦ »ç¿ëÇÏÁö ¾Ê°í ½º´ÏÇÎÀ» ÇÕ´Ï´Ù.
    ½º´ÏÇÎÇϴ ȣ½ºÆ®ÀÇ MAC ÁÖ¼Ò·Î ¿À´Â ÆÐŶÀ̳ª ºê·Îµåij½ºÆà ÆÐŶ¸¸À» ¸ð´ÏÅ͸µÇÕ´Ï´Ù.
    -P <snap> : ÆÐŶÀÇ ½º³À·»(snaplen)À» ÁöÁ¤ÇÕ´Ï´Ù. µðÆúÆ®´Â 1514ÀÔ´Ï´Ù.
    ½º³À·»Àº ĸÃÄÇÒ ¼ö ÀÖ´Â ÆÐŶÀÇ ÃÖ´ë Å©±âÀÔ´Ï´Ù. ¸¸¾à ½º³À·»º¸´Ù Å« ÆÐŶÀ» ĸÃÄÇÒ °æ¿ì ½º³À·»¸¸Å­¸¸ ĸÃÄ µË´Ï´Ù.
    -q : ¾Æ¹«·± ¸Þ½ÃÁöµµ »Ñ¸®Áö ¾Ê½À´Ï´Ù.
    -r <tf> <tf>·Î ÁöÁ¤µÈ tcpdump ÆÄÀÏÀÇ ÆÐŶµé¿¡ ´ëÇؼ­ IDS ¿£ÁøÀ» µ¹¸³´Ï´Ù.
    -s ¾ó·µ ·Î±× ¸Þ½ÃÁö¸¦ syslog ½Ã½ºÅÛÀ» ÅëÇØ ½Ã½ºÅÛ¿¡ º¸³À´Ï´Ù.
    -S <n=v> ·ê ÆÄÀÏÀÇ var ·Î ÁöÁ¤µÈ º¯¼ö¸¦ ÀçÁ¤ÀÇ ÇÒ ¼ö ÀÖ½À´Ï´Ù. ·êÆÄÀÏÀÇ º¯¼ö nÀÇ °ªÀ» v·Î ÁöÁ¤ÇÕ´Ï´Ù.
    -t <dir> ÃʱâÈ­ ÈÄ <dir> µð·ºÅ丮·Î chrootÇÕ´Ï´Ù.
    -u <uname> ÃʱâÈ­ ÈÄ snortÀÇ uid¸¦ <uname>ÀÇ »ç¿ëÀÚ·Î ¹Ù²ß´Ï´Ù.
    -v ¸¹Àº ¸Þ½ÃÁö¸¦ »Ñ¸³´Ï´Ù.
    -V ¹öÀü Á¤º¸¸¦ Ç¥½ÃÇÕ´Ï´Ù.
    -X ¸µÅ© ·¹À̾îÀÇ ·Î¿ì ÆÐŶ µ¥ÀÌŸ¸¦ ´ýÇÁÇÕ´Ï´Ù.
    -e µÎ¹ø° ·¹À̾îÀÇ Çì´õ Á¤º¸¸¦ ÇÁ¸°Æ®ÇÕ´Ï´Ù.
    -d ¾îÇø®ÄÉÀÌ¼Ç ·¹À̾ ´ýÇÁÇÕ´Ï´Ù.
    -? µµ¿ò¸»À» º¸¿©ÁÝ´Ï´Ù.

    <filter options> À§Ä¡¿¡ ÁöÁ¤µÇ´Â ÇÊÅ͸µ ¿É¼ÇÀº tcpdump °°ÀÌ BPF¸¦ »ç¿ëÇÕ´Ï´Ù.
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