{"id":41658,"date":"2024-11-07T16:56:27","date_gmt":"2024-11-07T16:56:27","guid":{"rendered":"https:\/\/atmokpo.com\/w\/?p=41658"},"modified":"2024-11-26T06:36:03","modified_gmt":"2024-11-26T06:36:03","slug":"7-%eb%b3%b4%ec%95%88-%ec%84%a4%ec%a0%95-%eb%b0%8f-%eb%b0%a9%ed%99%94%eb%b2%bd-%ea%b4%80%eb%a6%ac-%ec%84%9c%eb%b2%84%ec%9d%98-%eb%a1%9c%ea%b7%b8-%eb%aa%a8%eb%8b%88%ed%84%b0%eb%a7%81-%eb%b0%8f-fail2ban","status":"publish","type":"post","link":"https:\/\/atmokpo.com\/w\/41658\/","title":{"rendered":"7.\ubcf4\uc548 \uc124\uc815 \ubc0f \ubc29\ud654\ubcbd \uad00\ub9ac, \uc11c\ubc84\uc758 \ub85c\uadf8 \ubaa8\ub2c8\ud130\ub9c1 \ubc0f Fail2Ban\uc744 \ud1b5\ud55c \ube0c\ub8e8\ud2b8\ud3ec\uc2a4 \uacf5\uaca9 \ubc29\uc9c0"},"content":{"rendered":"<article>\n<header>\n<p>\ube14\ub85c\uadf8 \uc6b4\uc601\uacfc \uc11c\ubc84 \uad00\ub9ac\uc5d0\uc11c \ubcf4\uc548\uc740 \uc808\ub300\uc801\uc73c\ub85c \uc911\uc694\ud55c \uc694\uc18c\uc785\ub2c8\ub2e4. \uc774 \uae00\uc5d0\uc11c\ub294 \uc6b0\ubd84\ud22c \uc11c\ubc84\uc5d0\uc11c \ubcf4\uc548\uc744 \uac15\ud654\ud558\uace0 \ubc29\ud654\ubcbd\uc744 \uad00\ub9ac\ud558\ub294 \ubc29\ubc95, \uadf8\ub9ac\uace0 \uc11c\ubc84 \ub85c\uadf8\ub97c \ubaa8\ub2c8\ud130\ub9c1\ud558\uc5ec \uac00\ub2a5\ud55c \uc704\ud611\uc744 \uc0ac\uc804\uc5d0 \ucc28\ub2e8\ud558\ub294 \ubc29\ubc95\uc744 \uc124\uba85\ud569\ub2c8\ub2e4. \ud2b9\ud788 Fail2Ban\uc744 \uc0ac\uc6a9\ud558\uc5ec \ube0c\ub8e8\ud2b8\ud3ec\uc2a4 \uacf5\uaca9\uc744 \ubc29\uc9c0\ud558\ub294 \ubc29\ubc95\uc5d0 \ub300\ud574\uc11c\ub3c4 \uc0c1\uc138\ud788 \ub2e4\ub8f0 \uac83\uc785\ub2c8\ub2e4.<\/p>\n<\/header>\n<section>\n<h2>1. \ubcf4\uc548 \uc124\uc815\uc758 \uc911\uc694\uc131<\/h2>\n<p>\uc6b0\ubd84\ud22c \uc11c\ubc84\uc5d0\uc11c \ube14\ub85c\uadf8\ub97c \uc6b4\uc601\ud558\ub2e4 \ubcf4\uba74 \ub2e4\uc591\ud55c \ubcf4\uc548 \uc704\ud611\uc5d0 \uc9c1\uba74\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uae30\ubcf8\uc801\uc73c\ub85c \ubcf4\uc548\uc744 \uac15\ud654\ud558\uba74 \ud574\ud0b9, DDoS \uacf5\uaca9 \ubc0f \ub370\uc774\ud130 \ub3c4\uc6a9 \ub4f1\uc73c\ub85c\ubd80\ud130 \ube14\ub85c\uadf8\ub97c \uc548\uc804\ud558\uac8c \ub9c9\uc744 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc11c\ubc84 \ubcf4\uc548\uc740 \ub2e4\uc74c\uacfc \uac19\uc740 \uc5ec\ub7ec \ub2e8\uacc4\ub97c \ud3ec\ud568\ud569\ub2c8\ub2e4:<\/p>\n<ul>\n<li>\uc815\uae30\uc801\uc778 \ubcf4\uc548 \uc5c5\ub370\uc774\ud2b8 \ubc0f \ud328\uce58 \uc801\uc6a9<\/li>\n<li>\uac15\ub825\ud55c \ube44\ubc00\ubc88\ud638 \ubc0f \uc778\uc99d \ubc29\uc2dd \uc801\uc6a9<\/li>\n<li>\uc11c\ube44\uc2a4 \ubc0f \ud3ec\ud2b8 \uad00\ub9ac<\/li>\n<li>\ubc29\ud654\ubcbd \ubc0f \uae30\ud0c0 \ubcf4\uc548 \ub3c4\uad6c \uc124\uc815<\/li>\n<\/ul>\n<\/section>\n<section>\n<h2>2. \ubc29\ud654\ubcbd \uad00\ub9ac<\/h2>\n<p>\ubc29\ud654\ubcbd\uc740 \ub124\ud2b8\uc6cc\ud06c \ubcf4\uc548\uc744 \uad6c\ucd95\ud558\ub294 \uc911\uc694\ud55c \uc694\uc18c\uc785\ub2c8\ub2e4. \uc6b0\ubd84\ud22c \uc11c\ubc84\uc5d0\uc11c\ub294 UFW(Uncomplicated Firewall)\ub97c \uc0ac\uc6a9\ud558\uc5ec \ubc29\ud654\ubcbd\uc744 \uad00\ub9ac\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. UFW\ub294 \uc0ac\uc6a9\ud558\uae30 \uac04\ud3b8\ud558\uace0, \ubcf5\uc7a1\ud55c \ubc29\ud654\ubcbd \uaddc\uce59\uc744 \uac04\ub2e8\ud788 \uc124\uc815\ud560 \uc218 \uc788\ub3c4\ub85d \ub3d5\uc2b5\ub2c8\ub2e4.<\/p>\n<pre><code>\n# UFW \uc124\uce58 (\uc6b0\ubd84\ud22c\uc5d0\ub294 \uae30\ubcf8\uc801\uc73c\ub85c \uc124\uce58\ub418\uc5b4 \uc788\uc74c)\nsudo apt-get install ufw\n\n# UFW \ud65c\uc131\ud654\nsudo ufw enable\n\n# \uae30\ubcf8 \uc815\ucc45 \uc124\uc815: \ub4e4\uc5b4\uc624\ub294 \ud2b8\ub798\ud53d\uc744 \ucc28\ub2e8\ud558\uace0 \ub098\uac00\ub294 \ud2b8\ub798\ud53d \ud5c8\uc6a9\nsudo ufw default deny incoming\nsudo ufw default allow outgoing\n\n# SSH \ud3ec\ud2b8(\uae30\ubcf8\uc801\uc73c\ub85c 22\ubc88 \ud3ec\ud2b8) \ud5c8\uc6a9\nsudo ufw allow 22\/tcp\n<\/code><\/pre>\n<p>\ub2e8\uc77c \ud3ec\ud2b8\ub97c \ud5c8\uc6a9\ud558\ub294 \uac83 \uc678\uc5d0\ub3c4 \ud2b9\uc815 IP \uc8fc\uc18c\ub098 IP \ubc94\uc704\uc5d0 \ub300\ud574\uc11c\ub9cc \uc811\uadfc\uc744 \ud5c8\uc6a9\ud558\ub294 \ubc29\ubc95\ub3c4 \uac00\ub2a5\ud569\ub2c8\ub2e4. \uc774\ub7ec\ud55c \uc124\uc815\uc740 \uc11c\ube44\uc2a4\uc758 \ubcf4\uc548\uc744 \ub354\uc6b1 \uac15\ud654\ud569\ub2c8\ub2e4:<\/p>\n<pre><code>\n# \ud2b9\uc815 IP \uc8fc\uc18c\uc5d0 \ub300\ud574 SSH \uc811\uc18d \ud5c8\uc6a9\nsudo ufw allow from 192.168.1.100 to any port 22\n        <\/code><\/pre>\n<p>\uc124\uc815\ud55c \ubc29\ud654\ubcbd \uaddc\uce59\uc744 \ud655\uc778\ud558\ub824\uba74 \ub2e4\uc74c \uba85\ub839\uc5b4\ub97c \uc0ac\uc6a9\ud569\ub2c8\ub2e4:<\/p>\n<pre><code>\nsudo ufw status\n        <\/code><\/pre>\n<p>\uc774\uc81c \ubc29\ud654\ubcbd \uc124\uc815\uc774 \uc644\ub8cc\ub418\uc5c8\uc2b5\ub2c8\ub2e4!<\/p>\n<\/section>\n<section>\n<h2>3. \uc11c\ubc84 \ub85c\uadf8 \ubaa8\ub2c8\ud130\ub9c1<\/h2>\n<p>\uc11c\ubc84 \ub85c\uadf8\ub294 \ubcf4\uc548 \uc704\ud611\uc744 \uc870\uae30\uc5d0 \ubc1c\uacac\ud558\ub294 \ub370 \uc911\uc694\ud55c \uc5ed\ud560\uc744 \ud569\ub2c8\ub2e4. \uc6b0\ubd84\ud22c \uc11c\ubc84\uc5d0\uc11c\ub294 \/var\/log \ub514\ub809\ud1a0\ub9ac \uc544\ub798\uc5d0 \ub2e4\uc591\ud55c \ub85c\uadf8 \ud30c\uc77c\uc774 \uc788\uc2b5\ub2c8\ub2e4. \uc774 \ub85c\uadf8 \ud30c\uc77c\ub4e4\uc744 \uc815\uae30\uc801\uc73c\ub85c \ubaa8\ub2c8\ud130\ub9c1\ud558\ub294 \uac83\uc774 \uc911\uc694\ud569\ub2c8\ub2e4. \ub2e4\uc74c\uc740 \uc8fc\uc694 \ub85c\uadf8 \ud30c\uc77c\uc785\ub2c8\ub2e4:<\/p>\n<ul>\n<li><code>\/var\/log\/auth.log<\/code>: \uc778\uc99d \uad00\ub828 \ub85c\uadf8<\/li>\n<li><code>\/var\/log\/syslog<\/code>: \uc2dc\uc2a4\ud15c \uad00\ub828 \ub85c\uadf8<\/li>\n<li><code>\/var\/log\/apache2\/access.log<\/code>: Apache\uc758 \uc811\uadfc \ub85c\uadf8<\/li>\n<li><code>\/var\/log\/apache2\/error.log<\/code>: Apache\uc758 \uc624\ub958 \ub85c\uadf8<\/li>\n<\/ul>\n<p>\ub85c\uadf8 \ud30c\uc77c\uc744 \ubaa8\ub2c8\ud130\ub9c1\ud558\uae30 \uc704\ud574 <code>tail<\/code> \uba85\ub839\uc5b4\ub97c \uc0ac\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4:<\/p>\n<pre><code>\n# auth.log\uc758 \ucd5c\uadfc 10\uc904 \ubaa8\ub2c8\ud130\ub9c1\ntail -f \/var\/log\/auth.log\n        <\/code><\/pre>\n<p>\ub610\ud55c, <code>grep<\/code>\uacfc \uac19\uc740 \uba85\ub839\uc5b4\ub97c \uc0ac\uc6a9\ud558\uba74 \ud2b9\uc815 \ud328\ud134\uc744 \ub85c\uadf8\uc5d0\uc11c \ucc3e\uc544\ub0bc \uc218 \uc788\uc2b5\ub2c8\ub2e4:<\/p>\n<pre><code>\n# \ub85c\uadf8\uc778 \uc2e4\ud328 \uae30\ub85d \uac80\uc0c9\ngrep \"Failed password\" \/var\/log\/auth.log\n        <\/code><\/pre>\n<\/section>\n<section>\n<h2>4. Fail2Ban\uc744 \ud1b5\ud55c \ube0c\ub8e8\ud2b8\ud3ec\uc2a4 \uacf5\uaca9 \ubc29\uc9c0<\/h2>\n<p>\ube0c\ub8e8\ud2b8\ud3ec\uc2a4 \uacf5\uaca9\uc740 \ud574\ucee4\uac00 \ube44\ubc00\ubc88\ud638\ub97c \ud574\ub3c5\ud558\uae30 \uc704\ud574 \uc5ec\ub7ec \ube44\ubc00\ubc88\ud638\ub97c \uc790\ub3d9\uc73c\ub85c \uc2dc\ub3c4\ud558\ub294 \ubc29\uc2dd\uc785\ub2c8\ub2e4. \uc774 \uacf5\uaca9\uc744 \ubc29\uc9c0\ud558\uae30 \uc704\ud574 Fail2Ban\uc774\ub77c\ub294 \ub3c4\uad6c\ub97c \uc0ac\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. Fail2Ban\uc740 \uc5ec\ub7ec \ub85c\uadf8 \ud30c\uc77c\uc744 \ubaa8\ub2c8\ud130\ub9c1\ud558\uc5ec \uc77c\uc815 \uc2dc\uac04 \ub0b4\uc5d0 \uc2e4\ud328\ud55c \ub85c\uadf8\uc778 \uc2dc\ub3c4\uac00 \uc77c\uc815 \uc218\ub97c \ucd08\uacfc\ud560 \uacbd\uc6b0 \ud574\ub2f9 IP\ub97c \ucc28\ub2e8\ud569\ub2c8\ub2e4.<\/p>\n<h3>4.1. Fail2Ban \uc124\uce58 \ubc0f \uc124\uc815<\/h3>\n<p>Fail2Ban\uc744 \uc124\uce58\ud558\ub824\uba74 \ub2e4\uc74c \uba85\ub839\uc5b4\ub97c \uc2e4\ud589\ud569\ub2c8\ub2e4:<\/p>\n<pre><code>\n# Fail2Ban \uc124\uce58\nsudo apt-get install fail2ban\n        <\/code><\/pre>\n<p>\uc124\uce58 \ud6c4, \uae30\ubcf8 \uc124\uc815 \ud30c\uc77c\uc744 \ubcf5\uc0ac\ud558\uc5ec \uc0ac\uc6a9\uc790 \uc815\uc758 \uc124\uc815 \ud30c\uc77c\uc744 \uc0dd\uc131\ud569\ub2c8\ub2e4:<\/p>\n<pre><code>\n# \uae30\ubcf8 \uc124\uc815 \ud30c\uc77c \ubcf5\uc0ac\nsudo cp \/etc\/fail2ban\/jail.conf \/etc\/fail2ban\/jail.local\n        <\/code><\/pre>\n<p>\uc774\uc81c <code>\/etc\/fail2ban\/jail.local<\/code> \ud30c\uc77c\uc5d0\uc11c \uc124\uc815\uc744 \uc218\uc815\ud558\uc5ec \uc6d0\ud558\ub294 \uc11c\ube44\uc2a4\ub97c \ubcf4\ud638\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, SSH\uc5d0 \ub300\ud55c \ubcf4\ud638 \uc124\uc815\uc744 \ucd94\uac00\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4:<\/p>\n<pre><code>\n[sshd]\nenabled = true\nport = ssh\nfilter = sshd\nlogpath = \/var\/log\/auth.log\nmaxretry = 5\nbantime = 24h\n        <\/code><\/pre>\n<p>\uc124\uc815\uc774 \uc644\ub8cc\ub418\uba74 Fail2Ban \uc11c\ube44\uc2a4\ub97c \uc2dc\uc791\ud558\uace0 \uc0c1\ud0dc\ub97c \ud655\uc778\ud569\ub2c8\ub2e4:<\/p>\n<pre><code>\n# \uc11c\ube44\uc2a4 \uc2dc\uc791\nsudo systemctl start fail2ban\n\n# \uc11c\ube44\uc2a4 \uc0c1\ud0dc \ud655\uc778\nsudo systemctl status fail2ban\n        <\/code><\/pre>\n<\/section>\n<section>\n<h2>5. \ub354 \ub098\uc544\uac00\uae30 &#8211; Fail2Ban\uc758 \ud544\ud130\ub9c1 \ud15c\ud50c\ub9bf<\/h2>\n<p>Fail2Ban\uc740 \ud2b9\uc815 \ud328\ud134\uc744 \ubaa8\ub2c8\ud130\ub9c1\ud558\uae30 \uc704\ud574 \ud544\ud130\ub97c \uc0ac\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ud544\ud130\ub294 <code>\/etc\/fail2ban\/filter.d\/<\/code>\uc5d0 \uc704\uce58\ud558\uace0, \uac01 \uc11c\ube44\uc2a4 \ubc0f \uc0c1\ud669\uc5d0 \ub9de\ucdb0 \uc0ac\uc6a9\uc790 \uc815\uc758\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, \uc0c8\ub85c\uc6b4 \ud544\ud130\ub97c \ub9cc\ub4e4\uace0 \uc544\ub798\uc640 \uac19\uc774 \uc791\uc131\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4:<\/p>\n<pre><code>\n[Definition]\nfailregex = Failed password for .* from <host> port \\d+\nignoreregex =\n        <\/host><\/code><\/pre>\n<p>\uc774 \ud544\ud130\ub294 &#8216;Failed password&#8217; \uba54\uc2dc\uc9c0\ub97c \uac10\uc9c0\ud558\uace0 \uc774\ub97c \uae30\ubc18\uc73c\ub85c IP \ucc28\ub2e8\uc744 \uc9c4\ud589\ud569\ub2c8\ub2e4.<\/p>\n<\/section>\n<section>\n<h2>6. \uacb0\ub860<\/h2>\n<p>\uc11c\ubc84\uc758 \ubcf4\uc548\uc740 \ub9e4\uc6b0 \uc911\uc694\ud558\uba70, \uc801\uc808\ud55c \ubc29\ud654\ubcbd \uc124\uc815, \ub85c\uadf8 \ubaa8\ub2c8\ud130\ub9c1, \uadf8\ub9ac\uace0 Fail2Ban\uacfc \uac19\uc740 \ub3c4\uad6c\ub97c \ud1b5\ud574 \ube0c\ub8e8\ud2b8\ud3ec\uc2a4 \uacf5\uaca9\uc5d0 \ud6a8\uacfc\uc801\uc73c\ub85c \ub300\uc751\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc815\uae30\uc801\uc73c\ub85c \ubcf4\uc548 \uc810\uac80 \ubc0f \uc5c5\ub370\uc774\ud2b8\ub97c \uc218\ud589\ud558\uace0, \ucd94\uac00\uc801\uc778 \ubcf4\uc548 \uc870\uce58\ub97c \ud1b5\ud574 \uc11c\ubc84\uc758 \ucde8\uc57d\uc810\uc744 \ucd5c\uc18c\ud654\ud558\ub294 \uac83\uc774 \ud544\uc694\ud569\ub2c8\ub2e4. \uc774\ub97c \ud1b5\ud574 \uc548\uc815\uc801\uc778 \ube14\ub85c\uadf8 \uc11c\ubc84 \uc6b4\uc601\uc774 \uac00\ub2a5\ud560 \uac83\uc785\ub2c8\ub2e4.<\/p>\n<\/section>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>\ube14\ub85c\uadf8 \uc6b4\uc601\uacfc \uc11c\ubc84 \uad00\ub9ac\uc5d0\uc11c \ubcf4\uc548\uc740 \uc808\ub300\uc801\uc73c\ub85c \uc911\uc694\ud55c \uc694\uc18c\uc785\ub2c8\ub2e4. \uc774 \uae00\uc5d0\uc11c\ub294 \uc6b0\ubd84\ud22c \uc11c\ubc84\uc5d0\uc11c \ubcf4\uc548\uc744 \uac15\ud654\ud558\uace0 \ubc29\ud654\ubcbd\uc744 \uad00\ub9ac\ud558\ub294 \ubc29\ubc95, \uadf8\ub9ac\uace0 \uc11c\ubc84 \ub85c\uadf8\ub97c \ubaa8\ub2c8\ud130\ub9c1\ud558\uc5ec \uac00\ub2a5\ud55c \uc704\ud611\uc744 \uc0ac\uc804\uc5d0 \ucc28\ub2e8\ud558\ub294 \ubc29\ubc95\uc744 \uc124\uba85\ud569\ub2c8\ub2e4. \ud2b9\ud788 Fail2Ban\uc744 \uc0ac\uc6a9\ud558\uc5ec \ube0c\ub8e8\ud2b8\ud3ec\uc2a4 \uacf5\uaca9\uc744 \ubc29\uc9c0\ud558\ub294 \ubc29\ubc95\uc5d0 \ub300\ud574\uc11c\ub3c4 \uc0c1\uc138\ud788 \ub2e4\ub8f0 \uac83\uc785\ub2c8\ub2e4. 1. \ubcf4\uc548 \uc124\uc815\uc758 \uc911\uc694\uc131 \uc6b0\ubd84\ud22c \uc11c\ubc84\uc5d0\uc11c \ube14\ub85c\uadf8\ub97c \uc6b4\uc601\ud558\ub2e4 \ubcf4\uba74 \ub2e4\uc591\ud55c \ubcf4\uc548 \uc704\ud611\uc5d0 \uc9c1\uba74\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uae30\ubcf8\uc801\uc73c\ub85c \ubcf4\uc548\uc744 &hellip; <a href=\"https:\/\/atmokpo.com\/w\/41658\/\" class=\"more-link\">\ub354 \ubcf4\uae30<span class=\"screen-reader-text\"> &#8220;7.\ubcf4\uc548 \uc124\uc815 \ubc0f \ubc29\ud654\ubcbd \uad00\ub9ac, \uc11c\ubc84\uc758 \ub85c\uadf8 \ubaa8\ub2c8\ud130\ub9c1 \ubc0f Fail2Ban\uc744 \ud1b5\ud55c \ube0c\ub8e8\ud2b8\ud3ec\uc2a4 \uacf5\uaca9 \ubc29\uc9c0&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[179],"tags":[],"class_list":["post-41658","post","type-post","status-publish","format-standard","hentry","category-179"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>7.\ubcf4\uc548 \uc124\uc815 \ubc0f \ubc29\ud654\ubcbd \uad00\ub9ac, \uc11c\ubc84\uc758 \ub85c\uadf8 \ubaa8\ub2c8\ud130\ub9c1 \ubc0f Fail2Ban\uc744 \ud1b5\ud55c \ube0c\ub8e8\ud2b8\ud3ec\uc2a4 \uacf5\uaca9 \ubc29\uc9c0 - \ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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