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Linux ÈëÇÖ¼ì²â·ÖÎö¼¼Êõ

¸üÐÂʱ¼ä:2018Äê04ÔÂ26ÈÕ17ʱ55·Ö À´Ô´:ÀÖÓã²¥¿Í ä¯ÀÀ´ÎÊý:

1. ¸ÅÊö

×îºÃµÄ°²È«·À»¤µ±È»ÊÇ“ÓùµÐÓÚ¹úÃÅÖ®Í┣¬ ͨ¹ý°²È«·À»¤¼¼Êõ£¬À´±£Ö¤µ±Ç°Ö÷»ú²»±»·ÇÊÚȨÈËÔ±ÈëÇÖ£¬µ«ÊÇ“µÀ¸ßÒ»³ß£¬Ä§¸ßÒ»ÕÉ”£¬ ÔٺõķÀ»¤ÊֶΡ¢ÍùÍùÒ²»áÓÐÊ詵ĵط½¡£ÔÚÕâÖÖÇé¿öÏ£¬Êºó(ÈëÇÖºó)µÄ×·Ëݼ¼Êõ¾ÍºÜÖØÒªÁË¡£ºÃ±ÈÒ»¸öÇÔÔôµ½ÎÒÃǼÒÁï´ïһȦ£¬ÎÒ¾¹È»ÎÞ·¨ÖªµÀÊÇ·ñÇÔÔôÀ´¹ý£¬Ï¸Ë¼ÕâÊÇÒ»¼þ·Ç³£¿Ö²ÀµÄÊÂÇé¡£Õâ¾ÍÒâζ×Å£¬ÎÒÃǵļÒ(Ö÷»ú)²»ÔÚ°²È«£¬¹íÖªµÀÇÔÔôʲôʱºòÔÙÀ´Áï´ïһȦ¡£

ÈëÇÖ·ÖÎö¼¼ÊõÒ»°ãͨ¹ýÊÇͨ¹ý·ÖÎöÖ÷»ú¹Ø¼üµÄÎļþ¼Ç¼¡¢½ø³ÌÐÅÏ¢µÈÀ´´ïµ½·ÖÎöÖ÷»úÊÇ·ñ±»ÇÖÈëµÄÄ¿µÄ¡£´Ó°²È«·À»¤µÄ½Ç¶ÈÀ´½²£¬ÕâÊÇÒ»Ïîʺó×·×Ù¼¼Êõ(¿É×·ËÝÐÔ);´Ó¹¥»÷µÄ½Ç¶ÈÀ´Ëµ£¬ µ±Hack³É¹¦ÊµÊ©¹¥»÷(ÈëÇÖ)ºó£¬Òª½øÐÐÑÚ×ÙÃð¼££¬Ò²¾ÍÊÇÇå³ýÈëÇÖºÛ¼££¬µ±ÖªµÀÈëÇÖ·ÖÎöÄÄЩµØ·½ºó£¬ÄÇô×÷ΪÈëÇÖÕßÒ²¾ÍÃ÷°×ÐèÒªÖØµã¹Ø×¢ÄÄЩÈëÇÖºÛ¼£ÁË¡£

Ëùν“δ֪¹¥£¬ÑÉÖª·À”£¬ ͬÑùÒ²¿ÉÒÔ˵“δ֪·À£¬ÑÉÖª¹¥”, ¹¥·ÀÖ®µÀ£¬±¾¾ÍÊÇÔÚ¹¥·À²©ÞÄÖÐÏ໥Ìá¸ß¡£

2. »·¾³

±¾´Î½éÉܵÄÈëÇÖ·ÖÎö¼¼Êõ»ùÓÚ»·¾³ÈçÏ£º

l ·¢Ðаæ£º

Panda.Guo@2018-04-18 10:42:55 $ lsb_release -a

No LSB modules are available.

Distributor ID: Debian

Description:    Debian GNU/Linux 9.4 (stretch)

Release:    9.4

Codename:   stretch

l ÄÚºË

Panda.Guo@2018-04-18 10:59:33 $ uname -a

Linux PandaGuo 4.9.0-6-amd64 #1 SMP Debian 4.9.82-1+deb9u3 (2018-03-02) x86_64 GNU/Linux

1. Debian 9 ÈëÇÖ·ÖÎö

3.1 Óû§ÕʺÅ

´Ó¹¥»÷µÄ½Ç¶ÈÀ´½²£¬Hackerʵʩ¹¥»÷ºó£¬³ýÁË»á“ÑÚ×ÙÃð¼£”Ö®Í⻹»á½øÐГ´´½¨ºóÃÅ”£¬ÒԱ㽫ÕâÖÖ¹¥»÷µÄ»ú»á³ÖÐøÏÂÈ¥£¬¶ø´´½¨ºóÃÅÓû§ÕʺÅ£¬ÍùÍùÊDZȽϿÉÐеÄ;¾¶¡£

1. ËÑѰ¾ß±¸shellÓû§µÄÕʺţ¬ /etc/passwd

Panda.Guo@2018-04-18 11:34:31 $ cat /etc/passwd|awk -F: '{print $7}'| sort |uniq -c

  3 /bin/bash

  21 /bin/false

  1 /bin/sync

  17 /usr/sbin/nologin

Panda.Guo@2018-04-18 11:45:31 $ cat /etc/passwd | grep "bash"

  root:x:0:0:root:/root:/bin/bash

  panda:x:1000:1000:panda,,,:/home/panda:/bin/bash

  itcast:x:2001:2001::/home/itcast:/bin/bash

Panda.Guo@2018-04-18 11:45:40 $

¶ÔÆäÖÐÓÐshellµÄÓû§ÐèÒªÖØµã¹Ø×¢£¬±¾ÎļÙÉèitcastÓû§Îª“ÐèÖØµã¹ØÕÕ”Óû§

1.½øÒ»²½·ÖÎöÓû§itcast

2.²é¿´Óû§idºÍ×éÐÅÏ¢£º

Panda.Guo@2018-04-18 11:45:40 $ id itcast

  uid=2001(itcast) gid=2001(itcast) group=2001(itcast)

l ²é¿´Óû§×î½üµÇ¼ÐÅÏ¢

Panda.Guo@2018-04-18 11:51:33 $ lastlog -u itcast

Username         Port     From             Latest

itcast           pts/10   127.0.0.1        Thu Apr 12 19:03:20 +0800 2018

l ²é¿´Óû§ÀúÊ·µÇ¼ÐÅÏ¢: last hacker

Panda.Guo@2018-04-18 11:51:35 $ last itcast
itcast   pts/10       127.0.0.1        Thu Apr 12 19:03 - 10:16  (15:12)
itcast   pts/6        172.16.28.59     Thu Apr 12 16:03 - 16:03  (00:00)
itcast   pts/6        172.16.28.59     Thu Apr 12 16:02 - 16:03  (00:00)
 
wtmp begins Sun Apr  1 23:41:17 2018

l ²é¿´Óû§µÇ¼ʧ°ÜÐÅÏ¢:

Panda.Guo@2018-04-18 11:52:45 $ sudo lastb itcast

itcast   ssh:notty    127.0.0.1        Thu Apr 12 19:03 - 19:03  (00:00)

itcast   ssh:notty    172.16.28.59     Thu Apr 12 16:03 - 16:03  (00:00)

 

btmp begins Tue Apr  3 09:20:30 2018

Panda.Guo@2018-04-18 11:52:49 $ 

l ²é¿´×ÛºÏÐÅÏ¢: finger hacker

Panda.Guo@2018-04-18 11:53:20 $ finger itcast

Login: itcast                   Name:

Directory: /home/itcast                 Shell: /bin/bash

Last login Thu Apr 12 19:03 (CST) on pts/10 from 127.0.0.1

No mail.

No Plan.

¹ûitcastÓû§µÇ¼ÓÐÒì³£µÄIPµÇ¼, ÔòÐèÖØµã¹Ø×¢

3.2 ¿ÉÌáȨÓû§(sudo)

DebianϵͳÔÊÐíÆÕͨÓû§Í¨¹ýsudoÀ´»ñÈ¡rootÓû§È¨ÏÞ£¬ Òò´Ë¶ÔÓÚÒѾ­´æÔ򵀮ÕͨÓû§£¬Èç¹ûÆäÔÚ/etc/sudoers»òÕß/etc/sudoers.d/ϵÄÎļþÖУ¬ Ôò±íʾ´ËÆÕͨÓû§¿ÉÒÔͨ¹ýsudoÀ´Íê³Éroot²Ù×÷£¬ ÐèÒªÌØ±ð¹Ø×¢¡£

Áí¿ÉÒÔͨ¹ýÃüÁîgroups itcast(ÆäÖÐitcastÖ¸´úÐèÒª¹Ø×¢µÄÓû§username)£¬ Èç¹û¸ÃÓû§ËùÊôµÄ×éÊÇroot»òÕß sudo×飬»òÕ߸ÃÓû§ÔÚ/etc/sudoers(°üÀ¨/etc/sudoer.d/Ŀ¼)£¬ ÄǾÍÐèÒªÖØµã¹Ø×¢ÁË¡£

3.3 ¿ª»ú×ÔÆô·þÎñ

²»Í¬µÄLinux·¢Ðа棬²ÉÓõķþÎñ¹ÜÀíÆ÷ÊDz»Í¬µÄ£¬ Debian 8ÒÔÉÏÒѾ­²ÉÓÃSystemd×÷Ϊ·þÎñÆ÷¹ÜÀíÆ÷£¬ÆäʵĿǰ½Ïеķ¢ÐаæÏµÍ³É϶àÔÚ²ÉÓÃsystemd¡£±¾´ÎÎÒÃÇÒÔSystemdΪÀýÀ´·ÖÎö¿ª»ú×ÔÆðµÄһЩ³ÌÐò¡£

¶ÔÓÚsystemd·þÎñ¹ÜÀíÆ÷À´Ëµ£¬¿ÉÒÔͨ¹ýÏÂÊö·½Ê½²é¿´¿ª»ú×ÔÆôµÄ·þÎñ:

Panda.Guo@2018-04-18 15:25:23 $ systemctl list-unit-files --type=service | grep "enabled"

  accounts-daemon.service                    enabled

  anacron.service                            enabled

  auditd.service                             enabled

  autovt@.service                            enabled

  ¡£¡£¡£

ÈëÇÖºó£¬ÁôÏÂһЩ¿ª»ú×ÔÆðµÄ·þÎñ£¬ÒÔ±ãºóÐø¼ÌÐøÈëÇÖ¡£Ò²ÊÇÈëÇÖ±£³Ö³Ö¾ÃÐÔµÄÒ»ÖÖÊֶΡ£

3.4 ¼Æ»®(¶¨Ê±)ÈÎÎñ

³ýÁË¿ª»ú×ÔÆô¶¯·þÎñÍ⣬ Debian»¹¿ÉÒÔͨ¹ý¼Æ»®ÈÎÎñÀ´½øÐг־û¯ÔËÐС£

¼ì²éÒì³£µÄ¼Æ»®ÈÎÎñÏà¶Ô¼òµ¥£º

Ö»ÐèÒª²é¿´/etc/crontabÒÔ¼°×ÓĿ¼ÏÂ/etc/cron.*µÄ¼Æ»®ÈÎÎñÎļþ¼´¿É.

3.5 shellµÄ³õʼ»¯

²»Í¬µÄLinux·¢ÐаæµÄĬÈÏshellÊDz»Ò»ÖµÄ£¬ Ò»°ãdebianϵͳĬÈÏÊÇdash£¬ ¶øÎÒ×Ô¼ºÆ«°®bash£¬ Ò»°ãϵͳ°²×°Íê³Éºó£¬ÎÒ»áµ÷ÕûÎÒµÄshellΪbash£¬ ±¾½ÚÒÔbashΪÀý½øÐÐÃèÊö¡£

¶ÔÓÚshellÀ´Ëµ£¬¿É·ÖΪ½»»¥shell/·Ç½»»¥shell¡¢ µÇ¼shellºÍ·ÇµÇ¼shell¡£±¾ÖÊÉϾÍÊÇÔÚshellÆô¶¯ÆÚ¼ä£¬Ä¬ÈÏÖ´ÐеÄÅäÖÃÎļþ²»Í¬¶øÒÑ¡£ ¹ØÓÚÕâ¿éµÄÏêÏ¸Çø±ð£¬¿É²Î¿¼man bash ÖеÄINVOCATIONÕ½ڡ£»òÕ߲ο¼ÏÂͼ£º

¼òµ¥·ÖÎöÈçÏ£º

l ·Ç½»»¥/·ÇµÇ¼shell£º $BASh_ENV(»·¾³±äÁ¿)

l ·Ç½»»¥/µÇ¼shell£º/etc/profile ($HOME/.bash_profile¡¢$HOME/.bash_login¡¢$HOME/.profile°´´ÎÐòÏÈ´æÔÚµÄÖ´ÐÐ)

l ½»»¥/·ÇµÇ¼shell£º /etc/bash_bashrc¡¢$HOME/.bashrc

l ½»»¥/µÇ¼shell£º/etc/profile ($HOME/.bash_profile¡¢$HOME/.bash_login¡¢$HOME/.profile°´´ÎÐòÏÈ´æÔÚµÄÖ´ÐÐ)

ÉÏÃæÃèÊöµÄ±È½Ï¸´ÔÓ¡£¼òµ¥Ëµ£¬¾ÍÊÇbashÔÚÆô¶¯Ê±£¬ÒªÖ´Ðм¸¸ö½Å±¾Îļþ¡£ ÕâЩÎļþÖÐÈç¹ûÓÐÃüÁÔÚijÖÖÇé¿öÏÂ(µÇ¼·ÇµÇ¼¡¢½»»¥·Ç½»»¥)¿ÉÄܻᱻִÐС£ ÈëÇÖ·ÖÎöµÄÖØµã¾ÍÊDz鿴ÕâЩÎļþÖÐÊÇ·ñ´æÔÚ¿ÉÒÉÃüÁî¡£

3.6 ÀúÊ·ÃüÁî

Ò»°ã¶øÑÔ, ÈëÇÖÕß»ñÈ¡shellÖ®ºó»áÔÚÉÏÃæÖ´ÐÐijЩÃüÁî, ÎÒÃÇ¿ÉÒÔͨ¹ýhistoryÃüÁîÀ´²é¿´Ôø¾­ÔËÐйýµÄÃüÁî.»òÕßÖ±½Ó²é¿´~/.bash_historyÎļþ. ¸ßÃ÷µÄÈëÇÖÕßÍê³ÉÈëÇÖºó£¬Ò²»á½øÐÐijЩÑÚ×ÙÃ𼣡£ Òò´Ë£¬ Èç¹û·¢ÏÖÔø¾­ÔËÐйýµÄÃüÁîÖÐÓÐһЩ¿ÉÒÉÃüÁî(ĪÃûÆæÃîµÄÃüÁî)£¬»òÕß·¢ÏÖhistory±»¶ñÒâÇå³ý,»òÕß±»Òì³£´Û¸Ä, ÕâÒ²ÊÇÎÒÃdz£ÓõÄÈëÇÖ·ÖÎö¼¼Êõ¡£

ºÍhistoryÃüÁîÏà¹ØÓм¸¸ö»·¾³±äÁ¿£¬ÐèÒªÎÒÃÇÌØ±ð¹Ø×¢£¬ÏêÇé¿Éͨ¹ýman bash ²é¿´

l HISTFILE: ±£´æÀúÊ·ÃüÁîµÄÎļþ£¬ ĬÈÏÊÇ ~/.bash_history

l HISTFILESIZE: ÀúÊ·ÎļþÖаüº¬µÄ×î´óÐÐÊý¡£

l HISTSIZE: ÃüÁîÀúÊ·Öб£´æµÄÃüÁîÊýÁ¿ÐÐÊý¡£

l HISTTIMEFORMAT: ±£´æÀúÊ·ÃüÁîµÄʱ¼ä¸ñʽ¡£

3.7 ϵͳÈÕÖ¾

ÔÚdebian9ÉÏ£¬ÏµÍ³ÈÕ־ͳһÓÉrsyslog½ø³Ì²úÉú£¬ ºÍrsyslogÏà¹ØµÄÅäÖÿɲο¼/etc/rsyslog.confÎļþÒÔ¼°/etc/rsyslog.d/Ŀ¼¡£

l µÇ¼Ïà¹ØÐÅÏ¢

? ²é¿´Ã¿¸öÓû§×î½üµÄµÇ¼ʱ¼äºÍip: lastlog

? ²é¿´Ã¿¸öÓû§µÄµÇ¼¼Ç¼: last

? ²é¿´Ã¿¸öÓû§µÄµÇ¼³¢ÊÔ(°üÀ¨Ê§°ÜµÄ)¼Ç¼: lastb

? ²é¿´µ±Ç°µÇ¼µÄÓû§,ipÒÔ¼°ÕýÔÚÖ´ÐеÄÃüÁî: w

l һЩ³£¼ûµÄϵͳÈÕÖ¾½éÉÜÈçÏ£º

? /var/log/messages: Ò»°ãµÄϵͳÈÕÖ¾

? /var/log/kern.log: ϵͳÄÚºËÈÕÖ¾

? /var/log/boot.log: ϵͳÆô¶¯ÈÕÖ¾

? /var/log/auth.log: µÇ¼Ïà¹ØµÄÈÕÖ¾, ±ÈÈçssh/sudo³É¹¦Ê§°ÜµÄÈÕÖ¾¶¼ÔÚÕâÀï

? /var/log/cron.d: cron¼Æ»®ÈÎÎñµÄÖ´ÐÐÈÕÖ¾

l É󼯣¬ Éó¼ÆÈÕÖ¾ÓÉauditd²úÉú£¬/etc/audit/auditd.confΪÉó¼ÆÅäÖÃÎļþ£¬/etc/audit/audit.rules ΪÉ󼯹æÔòÎļþ¡£

? /var/log/audit/* £º ΪÉ󼯼Ǽ£¬¿ÉÒÔ½øÒ»²½·ÖÎö£¬Ò²Ðí¿ÉÒÔ·¢ÏÖһЩÒâÏë²»µ½µÄºÛ¼£(Èç¹ûÓеϰ).

3.8 ¿ÉÒɽø³Ì

Ò»°ã¿Éͨ¹ýtopÃüÁî²é¿´ÕýÔÚÔËÐеijÌÐòËùÕ¼ÓõÄ×ÊÔ´, »òÕßÓÃps auxÁгöµ±Ç°ÏµÍ³ËùÓõĽø³Ì. Èç¹û·¢ÏÖ¿ÉÒɽø³Ì(û¼û¹ý¡¢ºÄ×ÊÔ´), ¿ÉÒÔÓÃÒÔÏÂÃüÁî½øÒ»²½£º

l ²é¿´¸Ã½ø³ÌÆô¶¯µÄÍêÕûÃüÁîÐÐ: ps eho command -p $PID

l ²é¿´¸Ã½ø³ÌÆô¶¯Ê±ºòËùÔÚµÄĿ¼: readlink /proc/$PID/cwd

l ²é¿´¸Ã½ø³ÌÆô¶¯Ê±µÄÍêÕû»·¾³±äÁ¿: strings -f /proc/$PID/environ | cut -f2 -d ‘ ‘

l Áгö¸Ã½ø³ÌËù´ò¿ªµÄËùÓÐÎļþ: lsof -p $PID

Èç¹ûij¸ö¿ÉÒɽø³ÌÕýÔڻ£¬Ò»°ã»áÓëÍâ½çÓÐÍøÂç½»»¥£¬¿Éͨ¹ýÈçÏ·½·¨½øÒ»²½·ÖÎö£º

l ²é¿´µ±Ç°Ö÷»úµÄÍøÂçÁ¬½ÓÇé¿ö£¬ netstat -apn | grep $PID

l ×¥°ü·ÖÎö£¬tcpdump »òÕß Ê¹ÓÃͼÐλ¯×¥°ü¹¤¾ßwireshark

l ²é¿´Ö÷»ú·À»ðǽiptables£¬ DNS(/etc/resolv.confºÍ/etc/resolvconf/)¡¢http´úÀí£¬»òÕß/etc/hosts, ¶¼¿ÉÄܻᵼÖÂÎÒÃÇÕý³£µÄÍøÂçÇëÇó±»¹¥»÷Õß¼àÌý²¢´Û¸Ä. ÕâЩССµÄÐÞ¸ÄÒ²Ðí²»ÊǺÜÃ÷ÏÔ,¿ÉÒ»µ©·¢ÏÖ×ÔÉíÍøÂç»·¾³’²»Ì«¶Ô¾¢’, ¾ÍÒªÌá¸ß¾¯Ìè, ×ÐϸÅŲéÁË.

1. С½á

ÎÒÃÇÑо¿ÈëÇÖ·ÖÎö£¬´Ó“¹¥”µÄ½Ç¶ÈÀ´Ëµ£¬ÊÇΪÁËÔړʵʩ¹¥»÷”ºó£¬ÔÚ“ÑÚ×ÙÃð¼£”ÖÐ×öµÄ¸ü¼Ó³¹µ×£¬¸ü±ãÓÚÎÒÃǹ¥»÷µÄ³Ö¾ÃÐÔ£¬ ´Ó“·À”µÄ½Ç¶ÈÀ´Ëµ£¬ ÎÒÁ˽âÖ÷»úϵͳ±»ÈëÇÖºó£¬ÖªµÀÔÚÄÄЩµØ·½»áÁôϺۼ££¬Í¨¹ýÊÕ¼¯ÕâЩÈëÇÖºÛ¼££¬½áºÏ´óÊý¾ÝµÄ·ÖÎö¼¼ÊõÀ´»æÖÆÈëÇÖÕߵĹ¥»÷·Ïßͼ¡£ÒÔ±ã¸üºÃµÄ·À»¤¡£

ÀÖÓã²¥¿ÍºÚÂí³ÌÐòÔ±C/C++ÓëÍøÂç¹¥·Àѧ¿ÆÅàÑø×¨Ïî°×ñ×Ó°²È«È˲ţ¬

¿Î³Ì°üº¬ CÓïÑÔ¿ª·¢ÊµÕ½¡¢C¸ß¼¶±à³Ì¡¢C++ºËÐıà³ÌÓë×ÀÃæÓ¦Óÿª·¢¡¢Linux¸ß²¢·¢·þÎñÆ÷¿ª·¢¡¢ÐÅÏ¢°²È«ÓëÆóÒµÓ¦Óÿª·¢¡¢·Ö²¼Ê½ÔÆÆ½Ì¨¿ª·¢¡¢ÈëÇÖ¼ì²âÓëÍøÂç¹¥·ÀµÈ½×¶Î¡£

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·Redis(NoSQL»º´æÊý¾Ý¿â)

·Memcache(key-value·Ö²¼Ê½»º´æÊý¾Ý¿â)

·Libevent(¸ß²¢·¢·´Ó¦¶ÑģʽAPI)

·Epoll(LinuxÄں˸߼¶¶à·IO¼¼Êõ)

·GDB(ÄæÏò¹¤¾ß)

·SHM(¹²ÏíÄÚ´æÓ³Éä»úÖÆ)

·VIM(Îı¾±à¼­Æ÷)

·QT(¿çƽ̨ӦÓýçÃæ¿ò¼Ü)

Éæ¼°µ½µÄÐÂÐ˼¼ÊõÓУº

·fastDFS(·Ö²¼Ê½Îļþϵͳ)

·Golang(GoogleÍÆ³öµÄ¿ª·¢±à³ÌÓïÑÔ)

·Docker(ÐéÄ⻯ÈÝÆ÷¼¼Êõ)

·Go-micro(GoÓïÑÔ΢·þÎñ¿ò¼Ü)

·Beego(GoÓïÑÔ¸ßÐÔÄÜweb·þÎñÆ÷¿ò¼Ü)

·GEO(µØÀíλÖúËÐÄËã·¨)

·ASN.1(¿çƽ̨°²È«´«ÊäЭÒé)

·RPC(Ô¶³Ìµ÷Óùý³Ì)

·Oracle(¸ß¼¶ÊÂÎñ¹ØÏµÐÍÊý¾Ý¿â)

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·Kali Linux(Hacker²Ù×÷ϵͳ)

·Wireshark(ÍøÂç×¥°ü·ÖÎö¹¤¾ß)

·Aircrack-ng(¿ÉÆÆ½âWEP/WPA/WPA2¼ÓÃÜ)

·AppScan(©¶´É¨Ã蹤¾ß)

·DDos(·Ö²¼Ê½¾Ü¾ø·þÎñ¹¥»÷)

·WebÉøÍ¸(WebÒ³Ãæ´úÂëµÄ¹¥»÷ÐÎʽ)

·iptables(LinuxÄں˷À»ðǽ¼¼Êõ)

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·TCPDump(LinuxÄÚºËÍøÂçЭÒé²¶×½Æ÷)

·SQLMAP(SQL×¢Èë©¶´¹¥·À¼¼ÄÜ)

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