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[Linux] ¸®´ª½º ¹æÈ­º® firewalldÀÇ ¼Ò°³ ¹× È°¿ë
Date : 2023-05-26
Name : ¼­¹ö¸ó
Hits : 958



¾È³çÇϼ¼¿ä. ÁÖ½Äȸ»ç ¼­¹ö¸ó ÀÔ´Ï´Ù.


¿À´ÃÀº ¸®´ª½º ¹æÈ­º® firewalld¿¡ ´ëÇØ ¾Ë¾Æº¸µµ·Ï ÇÏ°Ú½À´Ï´Ù.


firewalldÀº ´Ù¾çÇÑ ¸®´ª½º ȯ°æ¿¡¼­ ±âº» ¹æÈ­º® °ü¸® µµ±¸·Î »ç¿ëµÇ°í ÀÖÀ¸¸ç

º» ±Û¿¡¼­´Â CentOS 7.x ȯ°æÀ» ±â¹ÝÀ¸·Î Å×½ºÆ®µÇ¾ú½À´Ï´Ù.

(firewalld´Â ½Ã½ºÅÛ °ü·Ã ¼³Á¤À̹ǷΠÀÛ¾÷ ½Ã root ±ÇÇÑ ÇÊ¿ä)


CentOSÀÇ °æ¿ì 6¹öÀü ÀÌÇÏ¿¡¼­´Â firewalldÀÌ ¾Æ´Ñ iptables ¸í·ÉÀ» »ç¿ëÇϹǷÎ

ÇØ´ç ³»¿ëÀº ¾Æ·¡ ¸µÅ©¸¦ Âü°í ºÎŹ µå¸³´Ï´Ù.


https://servermon.kr/board/board.html?code=servermon_board2&page=1&type=v&board_cate=&num1=999842&num2=00000&s_id=&stext=iptables&ssubject=ok&shname=&scontent=&number=1&lock=N 


¼­¹ö¸ó

HPE, LENOVO(=IBM), DELL, ½´ÆÛ¸¶ÀÌÅ©·Î ¼­¹ö, ±â¾÷¿ë PC, ½ºÅ丮Áö ¹× ¼ÒÇÁÆ®¿þ¾î (MS, ·¹µåÇÞ, ¿À¶óŬ), ¹®¼­º¸¾È¼Ö·ç¼Ç(½ÃÅ¥¾îµð½ºÅ©, ÀÎÅͳݵð½ºÅ©) À» À¯Åë ÆǸÅÇÏ´Â IT ÅëÇÕ¼Ö·ç¼Ç Àü¹® ȸ»çÀÔ´Ï´Ù.

www.servermon.kr



firewalld ¶õ?


1. firewalld ´Â ¹«¾ùÀΰ¡

firewalld´Â °£´ÜÈ÷ ¸»Çؼ­ CentOS 7.x ¹öÀüºÎÅÍ »ç¿ëµÇ´Â ¸®´ª½º ¹æÈ­º® °ü¸® µµ±¸ ÀÔ´Ï´Ù.


¸®´ª½ºÀÇ ¹æÈ­º®Àº ¸®´ª½º Ä¿³Î¿¡ Æ÷ÇÔµÈ Netfilter ¶ó´Â ¼­ºê ½Ã½ºÅÛÀ¸·Î »ç¿ëµÇ¸ç

¹Ì¸® ÁöÁ¤µÈ ±ÔÄ¢¿¡ ÀÇÇØ ÆÐŶÀÇ ¼Û/¼ö½ÅÀ» Çã¿ë/Â÷´ÜÇÏ´Â ÆÐŶ ÇÊÅ͸µ ÇüÅ·Πµ¿À۵˴ϴÙ.


CentOS 6.x ¹öÀü±îÁö´Â NetfilterÀÇ °ü¸® ÀÎÅÍÆäÀ̽º°¡ iptables ¿´°í

CentOS 7.x ¹öÀüºÎÅʹ NetfilterÀÇ °ü¸® ÀÎÅÍÆäÀ̽º°¡ firewalld ·Î º¯°æµÇ¾ú½À´Ï´Ù.


¹°·Ð CentOS 7.x ¹öÀü¿¡¼­µµ º°µµ ¼³Ä¡¸¦ ÅëÇØ iptablesÀ» »ç¿ëÇÏ´Â °ÍÀÌ °¡´ÉÇϳª

iptables°ú ºñ±³Çϸé firewalldÀÇ ÀåÁ¡ÀÌ ¸¹±â ¶§¹®¿¡ firewalld¸¦ »ç¿ëÇÏ´Â °ÍÀÌ Æí¸®ÇÕ´Ï´Ù.



2. firewalld¿Í iptablesÀÇ Â÷ÀÌÁ¡

firewalld¿Í iptablesÀÇ Â÷ÀÌÁ¡Àº ¾Æ·¡¿Í °°ÀÌ Á¤¸®ÇÒ ¼ö ÀÖ½À´Ï´Ù.


iptablesfirewalld
¼³Á¤ÀÇ º¯°æ- ¼³Á¤ º¯°æ ½Ã Àû¿ëÀ» À§ÇØ ¼­ºñ½º¸¦ Àç½ÃÀÛÇؾßÇϸç ÀÌ °úÁ¤¿¡¼­ ³×Æ®¿öÅ©°¡ ¼ø°£ÀûÀ¸·Î ²÷±è
- ¼³Á¤ º¯°æ ½Ã ±âÁ¸ ±ÔÄ¢À» ¸ðµÎ ¹ö¸®°í »õ·Î ºÒ·¯¿È
- ³×Æ®¿öÅ© Åë½ÅÀ» Áß´ÜÇÏÁö ¾Ê°í ±ÔÄ¢ ¼³Á¤ °¡´É
- ¼³Á¤ º¯°æ ½Ã Ãß°¡/º¯°æµÈ ±ÔÄ¢¸¸ ºÒ·¯¿È
¼³Á¤ ³­À̵µ- TCP/IPÀÇ ±¸Á¶¸¦ Àß ¾ËÁö ¸øÇÏ¸é ¼³Á¤ÀÌ ¾î·Æ°í ¸í·É ¿É¼ÇÀÌ º¹ÀâÇÔ- ºñ±³Àû ½±°Ô ¼³Á¤ °¡´É
À¯¿¬¼º- Àӽ÷Π±ÔÄ¢ ¼³Á¤ µîÀº ºÒ°¡- Àӽ÷Π»ç¿ëÇÒ ±ÔÄ¢°ú Áö¼ÓÀûÀ¸·Î »ç¿ëÇÒ ±ÔÄ¢À» °¢°¢ °ü¸®ÇÒ ¼ö ÀÖÀ½
- ¿¹¸¦ µé¸é ÀÏÁ¤ ½Ã°£¸¸ »ç¿ë ±ÔÄ¢ µî

À§¿Í °°ÀÌ firewalldÀº iptables°ú ºñ±³ÇÏ¸é ¼³Á¤ ¹æ¹ýÀÌ ½¬¿ì¸ç ¼³Á¤ÀÇ Àû¿ë°ú °ü¸®°¡ À¯¿¬ÇÏ´Ù´Â

ÀåÁ¡ÀÌ ÀÖ½À´Ï´Ù.



3. firewalld¿¡¼­ÀÇ zoneÀ̶õ?

firewalld´Â ¹æÈ­º® ±ÔÄ¢À» zoneÀ̶ó´Â ÇüÅ·Π¹­¾î¼­ °ü¸®ÇÒ ¼ö ÀÖ½À´Ï´Ù.


±âº»ÀûÀ¸·Î ¾Æ·¡¿Í °°ÀÌ 9°³ÀÇ ¿ëµµº° zoneÀÌ ¸¶·ÃµÇ¾î ÀÖÀ¸¸ç

³×Æ®¿öÅ© ÀÎÅÍÆäÀ̽º¸¦ ÇÒ´çÇÏ´Â ¹æ¹ýÀ¸·Î ¼³Á¤, »ç¿ëÇÕ´Ï´Ù.

(°¢ zoneÀº /etc/firewalld/zones/ °æ·Î ³» .xml ÆÄÀÏ·Î »ý¼ºÇÏ¿© »ç¿ë)

zone¼³¸í
public±âº»ÀûÀ¸·Î ÃÖ¼ÒÇÑÀÇ Çã¿ë ±ÔÄ¢ÀÌ ¼³Á¤µÈ zone, ±âº» zone À¸·Î »ç¿ëµÊ
blockµé¾î¿À´Â ÆÐŶÀ» ¸ðµÎ °ÅºÎ, ´Ü, Àü¼Û ÆÐŶÀÇ ¹Ýȯ Åë½ÅÀº Çã¿ë
dmzÀϹÝÀûÀÎ DMZ ÀÎÅÍÆäÀ̽º¿¡ ´ëÇÑ ¼³Á¤¿¡ »ç¿ë
dropµé¾î¿À´Â ÆÐŶÀ» ¸ðµÎ »èÁ¦, ´Ü, Àü¼Û ÆÐŶÀÇ ¹Ýȯ Åë½ÅÀº Çã¿ë
externalƯº°È÷ ¸Å½ºÄ¿·¹À̵ù ±ÔÄ¢ÀÌ Àû¿ëµÇ´Â ¿ÜºÎÀÇ ¶ó¿ìÅ͸¦ À§ÇØ »ç¿ë
homeȨ ¿µ¿ªÀ» À§ÇØ »ç¿ëµÇ´Â ±ÔÄ¢
internal³»ºÎ ³×Æ®¿öÅ© ÀÎÅÍÆäÀ̽º¿¡ ´ëÇÑ ¼³Á¤¿¡ »ç¿ë
trusted¸ðµç Åë½ÅÀ» Çã¿ëÇÏ´Â ±ÔÄ¢
work°°Àº ȸ»ç ³» ³»ºÎ ³×Æ®¿öÅ©¸¦ À§ÇØ »ç¿ëµÇ´Â ±ÔÄ¢ 



firewalld ¼­ºñ½º °ü¸®

firewalld ¼­ºñ½º´Â ¾Æ·¡¿Í °°Àº ¸í·É¾îµé·Î °ü¸®°¡ °¡´ÉÇÕ´Ï´Ù.


- firewalld ¼­ºñ½º ºñÈ°¼ºÈ­

# systemctl disables firewalld


- firewalld ¼­ºñ½º È°¼ºÈ­

# systemctl enable firewalld


- firewalld ¼­ºñ½º ÁßÁö

# systemctl stop firewalld


- firewalld ¼­ºñ½º ½ÃÀÛ

# systemctl start firewalld


- firewalld ¼­ºñ½º Àç½ÃÀÛ

# systemctl restart firewalld


- firewalld ¼­ºñ½º »óÅ ȮÀÎ

# systemctl status firewalld



firewalld ±âº» ¸í·É¾î »ç¿ë

firewalld ¼­ºñ½º´Â ¾Æ·¡¿Í °°Àº ¸í·É¾îµé·Î ±âº» Á¤º¸ È®ÀÎÀÌ °¡´ÉÇÕ´Ï´Ù.


- firewalld ¹öÀü È®ÀÎ

# firewall-cmd --version


- ÇöÀç firewalld ±âº» zone È®ÀÎ

# firewall-cmd --get-default-zone


- zoneÀÇ »ý¼º ¹× »èÁ¦

# firewall-cmd --permanent --new-zone=test

# firewall-cmd --permanent --delete-zone=test

- ±âº» zone º¯°æ(test·Î º¯°æ)

# firewall-cmd --set-default-zone=test


- ÇöÀç firewalld ¼³Á¤ Á¤º¸ È®ÀÎ

# firewall-cmd --list-all


- Á¤ÀÇµÈ service ¸ñ·Ï È®ÀÎ

# firewall-cmd --get-service


- Çã¿ëµÈ service ¸ñ·Ï È®ÀÎ

# firewall-cmd --list-service


- firewalld Àüü ¸í·É¾î È®ÀÎ

# firewall-cmd -h



firewalld zone °ü¸®

firewalld¿¡¼­´Â ±âº»ÀûÀ¸·Î public À̶ó´Â zoneÀÌ »ý¼ºµÇ¾îÀÖÀ¸¸ç

³×Æ®¿öÅ© ÀÎÅÍÆäÀ̽º¿¡ ±âº»°ªÀ¸·Î µî·ÏÀÌ µÇ¾îÀÖ½À´Ï´Ù.


±×·³ ÀÌÁ¦ º»°ÝÀûÀ¸·Î public zone¿¡ ±ÔÄ¢À» °ü¸®ÇÏ´Â ¹æ¹ýÀ» ¾Ë¾Æº¸°Ú½À´Ï´Ù.


1. service ·Î ¹æÈ­º® Çã¿ë µî·ÏÇϱâ

¿ì¼± Çã¿ëÇÒ ¼­ºñ½º°¡ Áö¿øÇÏ´Â ¼­ºñ½º ¸ñ·Ï¿¡ Á¸ÀçÇÏ´ÂÁö È®ÀÎÇÏ¿©¾ß ÇÕ´Ï´Ù.

# firewall-cmd --get-service


ÇöÀç public¿¡ Çã¿ë µî·ÏµÈ ¼­ºñ½º¸¦ È®ÀÎÇÏ°í

# firewall-cmd --list-service --zone=public


public zone¿¡ 4°³ÀÇ ¼­ºñ½º (http, https, dns, telnet)¸¦ Ãß°¡Çغ¸°Ú½À´Ï´Ù. 
# firewall-cmd --permanent --zone=public --add-service=http
# firewall-cmd --permanent --zone=public --add-service=https
# firewall-cmd --permanent --zone=public --add-service=dns
# firewall-cmd --permanent --zone=public --add-service=telnet


Ãß°¡ÇÑ ¼­ºñ½º Áß telnetÀº ´Ù½Ã »èÁ¦ÇÏ°í

# firewall-cmd --permanent --zone=public --remove-service=telnet


¼­ºñ½º Ãß°¡ ÈÄ ¼­ºñ½º Àû¿ëÀ» À§ÇØ ¹æÈ­º® Àç½ÃÀÛ
# firewall-cmd --reload


public¿¡ Çã¿ë Ãß°¡µÈ ¼­ºñ½º¸¦ ÀçÈ®ÀÎÇÕ´Ï´Ù.

# firewall-cmd --list-service --zone=public

À§ »çÁø°ú °°ÀÌ Á¤»óÀûÀ¸·Î 3°³ÀÇ ¼­ºñ½º (http, https, dns)°¡ Ãß°¡µÈ °ÍÀ» È®ÀÎÇÒ ¼ö ÀÖ½À´Ï´Ù.



2. port·Î ¹æÈ­º® Çã¿ë µî·ÏÇϱâ

±×·³ À̹ø¿¡´Â port¸¦  µî·ÏÇÏ´Â ¹æ¹ýÀ» ¾Ë¾Æº¸°Ú½À´Ï´Ù.

8080/tcp¿Í 8081/tcp¸¦ Ãß°¡ÇÏ°í 8081/tcp´Â ´Ù½Ã »èÁ¦ÇÏ´Â ÀÛ¾÷À» Çغ¸°Ú½À´Ï´Ù.


Ãß°¡ Àü¿¡ Çã¿ë Æ÷Æ® ¸®½ºÆ® È®ÀÎÇÏ°í
# firewall-cmd --list-port --zone=public

ƯÁ¤ Æ÷Æ® TCP 8080, 8081 Ãß°¡¸¦ ÁøÇàÇÕ´Ï´Ù.
# firewall-cmd --permanent --zone=public --add-port=8080/tcp
# firewall-cmd --permanent --zone=public --add-port=8081/tcp

´Ù½Ã ƯÁ¤ Æ÷Æ® TCP 8081 »èÁ¦ÇÏ°í
# firewall-cmd --permanent --zone=public --remove-port=8081/tcp

Ãß°¡µÈ Æ÷Æ® Àû¿ëÀ» À§ÇÑ ¹æÈ­º® Àç½ÃÀÛÀ» ÁøÇàÇÕ´Ï´Ù.
# firewall-cmd --reload

Çã¿ë Æ÷Æ® ¸®½ºÆ® È®ÀÎÇϸé
# firewall-cmd --list-port --zone=public

À§ »çÁø°ú °°ÀÌ 8080 Æ÷Æ®°¡ Ãß°¡µÇ¾î ÀÖÀ½À» È®ÀÎÇÒ ¼ö ÀÖ½À´Ï´Ù.



3. IP ´ë¿ªÀ¸·Î ¹æÈ­º® Çã¿ë µî·ÏÇϱâ

IP·Î Ãß°¡ÇÏ´Â ÀÛ¾÷Àº ƯÁ¤ IP³ª IP ´ë¿ªÀ» Çã¿ëÇÒ ¶§ »ç¿ë ÇÕ´Ï´Ù.

10.0.1.0/24, 10.0.2.0/24¿¡ ÇØ´çÇÏ´Â IP ´ë¿ªÀ» Ãß°¡ÇÏ°í

10.0.2.0/24´Â ´Ù½Ã »èÁ¦ÇÏ´Â ÀÛ¾÷À» Çغ¸°Ú½À´Ï´Ù.


Çã¿ë IP ¸®½ºÆ® È®ÀÎ (Ãß°¡ Àü)
# firewall-cmd --list-sources --zone=public

Çã¿ë IP Ãß°¡
# firewall-cmd --permanent --zone=public --add-source=10.0.1.0/24
# firewall-cmd --permanent --zone=public --add-source=10.0.2.0/24

Çã¿ë IP »èÁ¦
# firewall-cmd --permanent --zone=public --remove-source=10.0.2.0/24

Çã¿ë IP Àû¿ëÀ» À§ÇÑ ¹æÈ­º® Àç½ÃÀÛ
# firewall-cmd --reload

Çã¿ë IP ¸®½ºÆ® È®ÀÎ (Ãß°¡ ÈÄ)
# firewall-cmd --list-sources --zone=public

À§ »çÁø°ú °°ÀÌ 10.0.1.0/24 ´ë¿ªÀÌ Á¤»óÀûÀ¸·Î µî·ÏµÇ¾î ÀÖÀ½À» È®ÀÎÇÒ ¼ö ÀÖ½À´Ï´Ù.



4. xml ÆÄÀÏÀ» Á÷Á¢ ¼öÁ¤Çϱâ

¸¶Áö¸·À¸·Î´Â zoneÀÇ xml ÆÄÀÏÀ» Á÷Á¢ ¼öÁ¤ÇÏ´Â ÀÛ¾÷À» ÁøÇàÇغ¸°Ú½À´Ï´Ù.

ÀÏÀÏÀÌ ¸í·É¾î¸¦ ÀÔ·ÂÇϱ⠾î·Æ´Ù¸é ÀÌ ¹æ¹ýÀÌ ´õ °£´ÜÇÒ ¼ö ÀÖ½À´Ï´Ù.


¿ì¼± /etc/firewalld/zones/ °æ·Î¿¡ ÀÖ´Â public.xml ÆÄÀÏÀÇ ³»¿ëÀ» È®ÀÎÇغ¸°Ú½À´Ï´Ù.

#cat /etc/firewalld/zones/public.xml

±âº»ÀûÀ¸·Î Ãß°¡µÇ¾îÀÖ´ø ¼­ºñ½º dhcpv6-client ¿Í ssh ¿Ü¿¡ Áö±Ý±îÁö ÀÛ¾÷Çß¾ú´ø

3°³ÀÇ ¼­ºñ½º (http, https, dns), 8080 Æ÷Æ®, 10.0.1.0/24 ´ë¿ªÀÌ Ãß°¡µÇ¾î ÀÖÀ½À» È®ÀÎÇÒ ¼ö ÀÖ½À´Ï´Ù.


ÀÚ ±×·³ À§¿¡¼­ Ãß°¡Çß´Ù°¡ »èÁ¦Çß´ø telnet¼­ºñ½º, 8081Æ÷Æ®, 10.0.2.0/24 ´ë¿ªÀ» xml ÆÄÀÏ¿¡

Á÷Á¢ Ãß°¡ÇÏ¿© Á¤»óÀûÀ¸·Î Àû¿ëµÇ´ÂÁö º¸°Ú½À´Ï´Ù.


public.xml ÆÄÀÏÀ» vi ÆíÁý±â·Î ¿­¾îº¸°Ú½À´Ï´Ù.

# vi /etc/firewalld/zones/public.xml


i ¸¦ ÀÔ·ÂÇÏ¿© ÀԷ¸ðµå·Î ¹Ù²ãÁØ ÈÄ ±âÁ¸¿¡ µî·ÏµÇ¾îÀÖ´Â °ªµéÀ» ÂüÁ¶ÇÏ¿©

¾Æ·¡ »çÁø°ú °°ÀÌ telnet¼­ºñ½º, 8081Æ÷Æ®, 10.0.2.0/24 ´ë¿ªÀ» Ãß°¡ÇÕ´Ï´Ù.

¼öÁ¤ ÀÛ¾÷ÀÌ ¿Ï·áµÇ¾ú´Ù¸é esc Å°¸¦ ´©¸£°í :wq¸¦ ÀÔ·ÂÇÏ¿© ÀúÀå ÈÄ ºüÁ®³ª¿É´Ï´Ù.


¼öÁ¤µÈ »çÇ× Àû¿ëÀ» À§ÇÑ ¹æÈ­º® Àç½ÃÀÛÀ» ÁøÇàÇÏ°í
# firewall-cmd --reload


Çã¿ë Ãß°¡µÈ ¼­ºñ½º È®ÀÎ

# firewall-cmd --list-service --zone=public


Çã¿ë Æ÷Æ® ¸®½ºÆ® È®ÀÎ
# firewall-cmd --list-port --zone=public


Çã¿ë IP ¸®½ºÆ® È®ÀÎÀ» °¢°¢ ÁøÇàÇغ¸¸é
# firewall-cmd --list-sources --zone=public

À§ »çÁø°ú °°ÀÌ telnet¼­ºñ½º, 8081Æ÷Æ®, 10.0.2.0/24 ´ë¿ªÀÌ Á¤»óÀûÀ¸·Î Ãß°¡µÇ¾úÀ½À»

È®ÀÎÇÒ ¼ö ÀÖ½À´Ï´Ù.



¸¶Ä¡¸ç

¿À´ÃÀº ¸®´ª½º ¹æÈ­º® firewalld¿¡ ´ëÇØ ¾Ë¾Æº¸¾Ò½À´Ï´Ù.


±âº»ÀûÀ¸·Î firewalld¼­ºñ½º¸¦ °ü¸®ÇÏ´Â ºÎºÐºÎÅÍ ¼­ºñ½º, Æ÷Æ®, IP´ë¿ªÀ¸·Î 

¹æÈ­º® Çã¿ë µî·ÏÇÏ´Â ¹æ¹ýÀ» ¾Ë¾Æº¸¾Ò´Âµ¥¿ä. 


¿À´Ã È®ÀÎÇÑ ³»¿ë ¿Ü¿¡µµ ´Ù¾çÇÑ È¯°æ°ú ¿ëµµ¿¡ µû¸¥ È°¿ë ¹æ¹ýÀÌ ÀÖÁö¸¸

ÇØ´ç ³»¿ëÀº ³ªÁß¿¡ ±âȸ°¡ µÈ´Ù¸é ´Ù½Ã ´Ù·ê ¼ö ÀÖµµ·Ï ÇÏ°Ú½À´Ï´Ù.


¾Æ¸¶µµ º» Æ÷½ºÆà ³»¿ë¸¸À¸·Îµµ ¸®´ª½º ¹æÈ­º®¿¡ ´ëÇÑ ±âº» ³»¿ë°ú ¿øÇÏ´Â Ç׸ñ¿¡ ´ëÇÑ

¹æÈ­º® Çã¿ë µî ÀϹÝÀûÀÎ °ü¸®¿¡´Â ¹®Á¦°¡ ¾øÀ» °ÍÀ¸·Î »ý°¢µË´Ï´Ù.


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2023-05-26
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