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  • 한국리눅스유저그룹 Home ▶ 한국LUG 공지사항
    [본문 프린트하기]
       최근들어 웹서비스 포트에 대한 DOS ATTACK 이 많아져서 mod_evasive를 적용하였습니다.
      글쓴이 : 멀티 [PO : 188,338] 
      작성시간 : 2007-10-11 17:07  
      업데이트 :
    2007-10-11 17:07 
      조회 :
    13456 
      태그 : 태그 없음

    최근 들어 LUG 서버에 해외로 부터 웹서비스 포트 DOS ATTACK이 자주 발생하여

    mod_evasive 모듈을 장착함.

    리눅스 서버에 아파치 웹서버를 이용하시고 계시면

    반드시 mod_evasive 모듈을 장착하시기 바랍니다.

    관련 설명서는 소스에 포함된 파일을 참고하세요.

    공식 사이트 :   http://www.zdziarski.com/projects/mod_evasive/

    망극.


    mod_evasive v1.10.1

    What is mod_evasive?

    mod_evasive is an evasive maneuvers module for Apache to provide evasiveaction in the event of an HTTP DoS or DDoS attack or brute force attack. Itis also designed to be a detection and network management tool, and can be easily configured to talk to ipchains, firewalls, routers, and etcetera. mod_evasivepresently reports abuses via email and syslog facilities.

    Detection is performed by creating an internal dynamic hash table of IPAddresses and URIs, and denying any single IP address from any of the following:
    • Requesting the same page more than a few times per second
    • Making more than 50 concurrent requests on the same child per second
    • Making any requests while temporarily blacklisted (on a blocking list)

    This method has worked well in both single-server script attacks as wellas distributed attacks, but just like other evasive tools, is only asuseful to the point of bandwidth and processor consumption (e.g. theamount of bandwidth and processor required to receive/process/respondto invalid requests), which is why it's a good idea to integrate thiswith your firewalls and routers for maximum protection.

    This module instantiates for each listener individually, and therefore hasa built-in cleanup mechanism and scaling capabilities. Because of this per-childdesign, legitimate requests are never compromised (even from proxies and NAT addresses)but only scripted attacks. Even a user repeatedly clicking on 'reload' should not be affected unless they doit maliciously. mod_evasive is fully tweakable through the Apache configurationfile, easy to incorporate into your web server, and easy to use.

    Downloads:
    Stable [ Version 1.10.1 ] mod_evasive for Apache v1.3 and 2.0, and NSAPI (SunONE)

    CVS Access

    The mod_evasive source tree is available via CVS by using the following commands:
    cvs -d :pserver:cvs@cvs.nuclearelephant.com:/usr/local/cvsroot login
    cvs -d :pserver:cvs@cvs.nuclearelephant.com:/usr/local/cvsroot checkout mod_evasive

    Linux RPMs

    The following links are not official RPMs, but have been submitted asfreely downloadable.

    http://checksuite.sourceforge.net/dl/


    Apache Evasive Maneuvers Module
    For Apache 1.3 and 2.0
    Copyright (c) Deep Logic, Inc.
    Version 1.10 [2005.0117]

    LICENSE

    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License
    as published by the Free Software Foundation; version 2
    of the License.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

    WHAT IS MOD_EVASIVE ?

    mod_evasive is an evasive maneuvers module for Apache to provide evasive
    action in the event of an HTTP DoS or DDoS attack or brute force attack.  It
    is also designed to be a detection tool, and can be easily configured to talk
    to ipchains, firewalls, routers, and etcetera. 

    Detection is performed by creating an internal dynamic hash table of IP
    Addresses and URIs, and denying any single IP address from any of the following:

    - Requesting the same page more than a few times per second
    - Making more than 50 concurrent requests on the same child per second
    - Making any requests while temporarily blacklisted (on a blocking list)

    This method has worked well in both single-server script attacks as well
    as distributed attacks, but just like other evasive tools, is only as
    useful to the point of bandwidth and processor consumption (e.g. the
    amount of bandwidth and processor required to receive/process/respond
    to invalid requests), which is why it's a good idea to integrate this
    with your firewalls and routers.

    This module instantiates for each listener individually, and therefore has
    a built-in cleanup mechanism and scaling capabilities.  Because of this,
    legitimate requests are rarely ever compromised, only legitimate attacks.  Even
    a user repeatedly clicking on 'reload' should not be affected unless they do
    it maliciously.

    Three different module sources have been provided:

    Apache v1.3 API:    mod_evasive.c
    Apache v2.0 API:    mod_evasive20.c
    NSAPI (iPlanet):    mod_evasiveNSAPI.c *

    NOTE: mod_evasiveNSAPI is a port submitted by Reine Persson <reiper@rsv.se>
          and is not officially supported as part of the mod_evasive project.

    HOW IT WORKS

    A web hit request comes in. The following steps take place:

    - The IP address of the requestor is looked up on the temporary blacklist
    - The IP address of the requestor and the URI are both hashed into a "key". 
      A lookup is performed in the listener's internal hash table to determine
      if the same host has requested this page more than once within the past
      1 second. 
    - The IP address of the requestor is hashed into a "key".
      A lookup is performed in the listerner's internal hash table to determine
      if the same host has requested more than 50 objects within the past
      second (from the same child).

    If any of the above are true, a 403 response is sent.  This conserves
    bandwidth and system resources in the event of a DoS attack.  Additionally,
    a system command and/or an email notification can also be triggered to block
    all the originating addresses of a DDoS attack.

    Once a single 403 incident occurs, mod_evasive now blocks the entire IP
    address for a period of 10 seconds (configurable).  If the host requests a
    page within this period, it is forced to wait even longer.  Since this is
    triggered from requesting the same URL multiple times per second, this
    again does not affect legitimate users.

    The blacklist can/should be configured to talk to your network's firewalls
    and/or routers to push the attack out to the front lines, but this is not
    required.

    mod_evasive also performs syslog reporting using daemon.alert.  Messages
    will look like this:

    Aug  6 17:41:49 elijah mod_evasive[23184]: [ID 801097 daemon.alert] Blacklisting address x.x.x.x: possible attack.

    WHAT IS THIS TOOL USEFUL FOR?

    This tool is *excellent* at fending off request-based DoS attacks or scripted
    attacks, and brute force attacks. When integrated with firewalls or IP filters,
    mod_evasive can stand up to even large attacks. Its features will prevent you
    from wasting bandwidth or having a few thousand CGI scripts running as a
    result of an attack. 

    If you do not have an infrastructure capable of fending off any other types
    of DoS attacks, chances are this tool will only help you to the point of
    your total bandwidth or server capacity for sending 403's.  Without a solid
    infrastructure and address filtering tool in place, a heavy distributed DoS
    will most likely still take you offline. 

    HOW TO INSTALL

    APACHE v1.3
    -----------

    Without DSO Support:

    1. Extract this archive into src/modules in the Apache source tree

    2. Run ./configure --add-module=src/modules/evasive/mod_evasive.c

    3. make, install

    4. Restart Apache

    With DSO Support, Ensim, or CPanel:

    1. $APACHE_ROOT/bin/apxs -iac mod_evasive.c

    2. Restart Apache

    APACHE v2.0
    -----------

    1. Extract this archive

    2. Run $APACHE_ROOT/bin/apxs -i -a -c mod_evasive20.c

    3. The module will be built and installed into $APACHE_ROOT/modules, and loaded into your httpd.conf

    4. Restart Apache

    NSAPI
    SunONE (iPlanet,netscape) Installation
    --------------------------------------

    Tested on:
    iPlanet 4.1sp12
    iPlanet 6.0sp5

    Edit compile script for your environment and compile mod_evasiveNSAPI.c
    to a shared library.

    CONFIGURATION

    mod_evasive has default options configured, but you may also add the
    following block to your httpd.conf:

    APACHE v1.3
    -----------

    <IfModule mod_evasive.c>
        DOSHashTableSize    3097
        DOSPageCount        2
        DOSSiteCount        50
        DOSPageInterval     1
        DOSSiteInterval     1
        DOSBlockingPeriod   10
    </IfModule>

    APACHE v2.0
    -----------
    <IfModule mod_evasive20.c>
        DOSHashTableSize    3097
        DOSPageCount        2
        DOSSiteCount        50
        DOSPageInterval     1
        DOSSiteInterval     1
        DOSBlockingPeriod   10
    </IfModule>

    Optionally you can also add the following directives:

        DOSEmailNotify    you@yourdomain.com
        DOSSystemCommand    "su - someuser -c '/sbin/... %s ...'"
        DOSLogDir        "/var/lock/mod_evasive"

    You will also need to add this line if you are building with dynamic support:

    APACHE v1.3
    -----------

    AddModule    mod_evasive.c

    APACHE v2.0
    -----------

    LoadModule evasive20_module modules/mod_evasive20.so

    (This line is already added to your configuration by apxs)

    NSAPI
    SunONE (iPlanet,Netscape) Configuration
    --------------------------------------
                                                                                   
    Configure iPlanet 4.1
    ---------------------

    Edit obj.conf:
                                                                                   
    Init fn="load-modules" funcs="mod_evasive_init,mod_evasive_check" shlib="/opt/ns-4.1/plugins/lib/mod_evasive.sl"
                                                                                   
    Init fn="mod_evasive_init" DOSPageCount=2 DOSSiteCount=50 DOSPageInterval=1 DOSSiteInterval=1 DOSBlockingPeriod=10 DOSWhitelist="10.60.0.7,10.65.0.10"
                                                                                   
    In the default object:
    PathCheck fn=mod_evasive_check
                                                                                   
    Or an own object
    <Object name="evasive" ppath="/DoSProtectedArea*">
    NameTrans fn=mod_evasive_check
    </Object>
                                                                                   
                                                                                   
    Configure iPlanet 6.0
    ---------------------
                                                                                   
    Edit magnus.conf:
                                                                                   
    Init fn="load-modules" funcs="mod_evasive_init,mod_evasive_check" shlib="/opt/iplanet-6.0/plugins/lib/mod_evasive.sl"
                                                                                   
    Init fn="mod_evasive_init" DOSWhitelist="10.60.0.7,10.65.0.10"
                                                                                   
    Edit obj.conf:
    In the default object:
    PathCheck fn=mod_evasive_check
                                                                                   
    Or an own object
    <Object name="evasive" ppath="/DoSProtectedArea*">
    NameTrans fn=mod_evasive_check
    </Object>

    DOSHashTableSize
    ----------------

    The hash table size defines the number of top-level nodes for each child's
    hash table.  Increasing this number will provide faster performance by
    decreasing the number of iterations required to get to the record, but
    consume more memory for table space.  You should increase this if you have
    a busy web server.  The value you specify will automatically be tiered up to
    the next prime number in the primes list (see mod_evasive.c for a list
    of primes used).

    DOSPageCount
    ------------

    This is the threshhold for the number of requests for the same page (or URI)
    per page interval.  Once the threshhold for that interval has been exceeded,
    the IP address of the client will be added to the blocking list.
     
    DOSSiteCount
    ------------

    This is the threshhold for the total number of requests for any object by
    the same client on the same listener per site interval.  Once the threshhold
    for that interval has been exceeded, the IP address of the client will be added
    to the blocking list.

    DOSPageInterval
    ---------------

    The interval for the page count threshhold; defaults to 1 second intervals.

    DOSSiteInterval
    ---------------

    The interval for the site count threshhold; defaults to 1 second intervals.

    DOSBlockingPeriod
    -----------------

    The blocking period is the amount of time (in seconds) that a client will be
    blocked for if they are added to the blocking list.  During this time, all
    subsequent requests from the client will result in a 403 (Forbidden) and
    the timer being reset (e.g. another 10 seconds).  Since the timer is reset
    for every subsequent request, it is not necessary to have a long blocking
    period; in the event of a DoS attack, this timer will keep getting reset.

    DOSEmailNotify
    --------------

    If this value is set, an email will be sent to the address specified
    whenever an IP address becomes blacklisted.  A locking mechanism using /tmp
    prevents continuous emails from being sent.

    NOTE: Be sure MAILER is set correctly in mod_evasive.c
          (or mod_evasive20.c).  The default is "/bin/mail -t %s" where %s is
          used to denote the destination email address set in the configuration. 
          If you are running on linux or some other operating system with a
          different type of mailer, you'll need to change this.

    DOSSystemCommand
    ----------------

    If this value is set, the system command specified will be executed
    whenever an IP address becomes blacklisted.  This is designed to enable
    system calls to ip filter or other tools.  A locking mechanism using /tmp
    prevents continuous system calls.  Use %s to denote the IP address of the
    blacklisted IP.

    DOSLogDir
    ---------

    Choose an alternative temp directory

    By default "/tmp" will be used for locking mechanism, which opens some
    security issues if your system is open to shell users.

          http://security.lss.hr/index.php?page=details&ID=LSS-2005-01-01

    In the event you have nonprivileged shell users, you'll want to create a
    directory writable only to the user Apache is running as (usually root),
    then set this in your httpd.conf.

    WHITELISTING IP ADDRESSES

    IP addresses of trusted clients can be whitelisted to insure they are never
    denied.  The purpose of whitelisting is to protect software, scripts, local
    searchbots, or other automated tools from being denied for requesting large
    amounts of data from the server.  Whitelisting should *not* be used to add
    customer lists or anything of the sort, as this will open the server to abuse.
    This module is very difficult to trigger without performing some type of
    malicious attack, and for that reason it is more appropriate to allow the
    module to decide on its own whether or not an individual customer should be
    blocked.

    To whitelist an address (or range) add an entry to the Apache configuration
    in the following fashion:

    DOSWhitelist    127.0.0.1
    DOSWhitelist    127.0.0.*

    Wildcards can be used on up to the last 3 octets if necessary.  Multiple
    DOSWhitelist commands may be used in the configuration.

    TWEAKING APACHE

    The keep-alive settings for your children should be reasonable enough to
    keep each child up long enough to resist a DOS attack (or at least part of
    one).  Remember, it is the child processes that maintain their own internal
    IP address tables, and so when one exits, so does all of the IP information it
    had. For every child that exits, another 5-10 copies of the page may get
    through before putting the attacker back into '403 Land'.  With this said,
    you should have a very high MaxRequestsPerChild, but not unlimited as this
    will prevent cleanup.

    You'll want to have a MaxRequestsPerChild set to a non-zero value, as
    DosEvasive cleans up its internal hashes only on exit.  The default
    MaxRequestsPerChild is usually 10000.  This should suffice in only allowing
    a few requests per 10000 per child through in the event of an attack (although
    if you use DOSSystemCommand to firewall the IP address, a hole will no
    longer be open in between child cycles).

    TESTING

    Want to make sure it's working? Run test.pl, and view the response codes.
    It's best to run it several times on the same machine as the web server until
    you get 403 Forbidden messages. Some larger servers with high child counts
    may require more of a beating than smaller servers before blacklisting
    addresses.

    Please don't use this script to DoS others without their permission.

    KNOWN BUGS

    - This module appears to conflict with the Microsoft Frontpage Extensions.
      Frontpage sucks anyway, so if you're using Frontpage I assume you're asking
      for problems, and not really interested in conserving server resources anyway.

    FEEDBACK

    ...



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    1. CentOS 리눅스 구축관리실무 집필
    2007년 12월 출판 - 출판사 : (주)수퍼유저코리아
    * 2009년 *
    2. 김태용의 C++ 기초 입문 :: gcc로 공부하는 C++와 wxWidgets GUI 집필
    2009년 03월 출판 - 출판사: (주)수퍼유저코리아
    3. 김태용의 리눅스 쉘 스크립트 프로그래밍 입문 집필
    2009년 9월 출판 - 출판사: 제이펍
    * 2011년 *
    4. 김태용의 JSP 웹 프로그래밍 입문
    2011년 1월 출판 - 출판사: 제이펍

  • 인생목표 프로젝트
    - 공학/기술인의 위상을 높이고, 공학과 기술중심의 TechNation Korea 건설을 위한 공학정치 실현
    - 공학/기술인을 대한민국의 수장으로 만들기
    - 1000만 달러 벌기 -> 우수 공학인재 서포팅하기

    서식지 : 대구 어느 골짜기..
    Who am I?

    [한국리눅스유저그룹]의 글을 퍼가실때에는 반드시 [출처]를 표시해 주시는 센스가 필요합니다!
    지금 이시간, 공부하고 있는 당신은 머지않아 최고가 될 것입니다. 즐겁게 공부하시고, 힘내십시오!
    포스팅 글이 유용하셨다면 RSS를 구독하시면 됩니다.
    유용하고, 좋은글 포스팅 바랍니다. 포스팅된 글은 (전세계)? 대부분의 소셜 사이트에 포스팅됩니다.



  • [본문 프린트하기]

    [포인트 정책] :: 글읽기 : 0점(글쓴이는 포인트 받음), 글쓰기 : +20점, 코멘트 : +10점, 다운로드 : -200점
    총조회수 : 476,905회 | 전체글 : 295건 | 게시글 : 59건 | 코멘트 : 236건
    번호 제목 글쓴이 날짜 조회
    한국LUG 소개 자료 (2) 김태용
    PO : 188,338
    02-24 12175
    공지사항 입니다. 김태용
    PO : 188,338
    12-30 16364
    29 LUG 홈피에 포인트 제도를 시범 시행중입니다. (8) 김태용
    PO : 188,338
    08-23 6961
    28 회원아이콘과 회원이미지를 올릴 수 있어요. (6) 김태용
    PO : 188,338
    08-06 4922
    27 2008년 즐거운 설날 보내시고, 새해 복 많이 받으세요. (1) 멀티
    PO : 188,338
    02-06 5964
    26 위키페이지 와 노트북 게시판을 만들어 봤습니다. 멀티
    PO : 188,338
    01-28 7832
    25 LUG서버 업그레이드 해야겠습니다. (4) 멀티
    PO : 188,338
    01-10 6488
    24 2008년을 맞이하여 홈피에 펭귄 배경을 넣었습니다. (2) 멀티
    PO : 188,338
    12-28 6589
    23 한국LUG 메일링리스트(http://lists.lug.or.kr)를 오픈하였… 멀티
    PO : 188,338
    12-26 7825
    22 openssl을 이용하여 보안로그인을 장착하였습니다. (1) 멀티
    PO : 188,338
    11-20 7104
    21 LUG 홈피 트랙백 포스팅 가능합니다. 김태용
    PO : 188,338
    11-16 5994
    20 "다음" 에서 oss 미러링을 많이 하고 있네요. 멀티
    PO : 188,338
    11-03 10342
    19 구글 커스텀 서치엔진을 장착하였습니다. 멀티
    PO : 188,338
    10-21 7287
    18 최근들어 웹서비스 포트에 대한 DOS ATTACK 이 많아져서… 멀티
    PO : 188,338
    10-11 13457
    17 CentOS 리눅스 구축관리 실무 저자 직강 중입니다. (6) 멀티
    PO : 188,338
    10-08 15356
    16 한국LUG 서버 파워풀한 사양 공개 ^^ 멀티
    PO : 188,338
    07-05 6959
    15 개인 블로그 사용을 위한 도메인을 만들어 드릴까 합… (3) 멀티
    PO : 188,338
    06-27 7291
     1  2  3  4  
    [게시판 맨위로]
    한국LUG는 대한민국의 리눅스 지식인[사용자/개발자]들의 커뮤니티입니다. [매년 1~2회의 공개세미나 개최]
    한국LUG : 울산 - 광주 - 전북 - 인천 - 대전 - LUG 위키

    [Linux Distribution] : CentOS | Ubuntu | Fedora | WhiteBox | Debian | Slackware | Gentoo | openSuSE

    "Linux" is a registered trademark of Linus Torvalds. "Linux is Kernel"
    - 리눅스는 공짜가 아니라 자유[Free & Effort]입니다 -
    [인터넷 서점/출판사 링크] : 강컴 | 알라딘 | 인터파크 | 예스24 | 교보문고 | 수퍼유저코리아 | 제이펍
    한국LUG 사이트는 1024 x 768 해상도(운영자 노트북:14")에 최적화 되어 있습니다. : LINUX FANSITE
    WWW.LUG.OR.KR Server is made by CentOS Linux, P4 1.8G, Memory 512MB, Main HDD 160GB, Backup HDD 40GB and LAMP, qmail MTA.
    CentOS Linux & Mozilla Firefox UTF-8 Base Created.
    visitor stats
    1998-2021 www.lug.or.kr   Directed By Great Dragon, Kim.   Top
    LUG 포인트 정책 : [회원가입 : +100점] [로그인(하루한번) : +100점] [글쓰기 : +20점] [코멘트 : +10점] [다운로드 : -200점] [질문 포인트 : 최소 200점]
    데스크탑 프로그래밍(gcc, g++, wxGTK[wxWidgets] 등)은 "Fedora"를 사용하고, 서버 운영(WEB, FTP 등)은 "CentOS"를 사용하시길 권장합니다.
    도전하는자, 자신을 투자하는자만이 뜻하는바를 이룰 수 있다.
    Information should be Exchanged with Interactive, not One Way Direction.
    준회원, 정회원, 우수회원, VIP회원, 기업회원, 관리자
    Be Maker!
    인생에서, 100% 순이익을 보장하는건 없다. 1%의 지식을 나눔으로써, 가끔씩 손해볼 필요도 있다.
    그대가 가진 1%의 지식만이라도 공공을 위해 포스팅하라. 손해본다는 생각이 앞선다면 그대의 인생은 힘들어질것이다.
    자신이 가진 지식의 1%도 투자하지 않고, 오로지 자신의 이익만 탐하는자와는 동지가 되지마라.
    만나서 대화하면 모두 좋은 사람들이지만, 유독 인터넷에서만 자신을 밝히지 않고, 좀비로 서식하는 사람들이 많다.
    부지불식간[不知不識間], 좀비(하류) 인생이 될지도 모르니, 항상 자신을 경계하도록 하라.
    홈으로~
    [도서 안내]
    1. CentOS Linux
    2. gcc로 공부하는 C++
    베스트셀러 입성^^

    3. 쉘 스크립트 입문
    4. JSP 입문

    아래 배너들은 LUG 세미나 모임에 도움을 주신(실) 멋진 기업들입니다. ^^