{"id":18153,"date":"2014-01-11T06:13:08","date_gmt":"2014-01-10T22:13:08","guid":{"rendered":"https:\/\/2blog.ilc.edu.tw\/25793\/2014\/01\/11\/%e5%88%a9%e7%94%a8-fail2ban-%e9%98%bb%e6%93%8b%e4%be%86%e8%87%aa%e7%b6%b2%e8%b7%af%e7%9a%84-ssh-%e9%80%a3%e7%b7%9a%e6%94%bb%e6%93%8a\/"},"modified":"2014-01-11T06:13:08","modified_gmt":"2014-01-10T22:13:08","slug":"%e5%88%a9%e7%94%a8-fail2ban-%e9%98%bb%e6%93%8b%e4%be%86%e8%87%aa%e7%b6%b2%e8%b7%af%e7%9a%84-ssh-%e9%80%a3%e7%b7%9a%e6%94%bb%e6%93%8a","status":"publish","type":"post","link":"https:\/\/2blog.ilc.edu.tw\/25793\/2014\/01\/11\/%e5%88%a9%e7%94%a8-fail2ban-%e9%98%bb%e6%93%8b%e4%be%86%e8%87%aa%e7%b6%b2%e8%b7%af%e7%9a%84-ssh-%e9%80%a3%e7%b7%9a%e6%94%bb%e6%93%8a\/","title":{"rendered":"\u5229\u7528 fail2ban \u963b\u64cb\u4f86\u81ea\u7db2\u8def\u7684 SSH \u9023\u7dda\u653b\u64ca"},"content":{"rendered":"

\u5728 \/var\/log\/secure \u4e2d\u5617\u8a66\u4ee5 root \u5e33\u865f\u767b\u5165\u7684\u932f\u8aa4\u8a18\u9304
# grep Failed \/var\/log\/secure | grep -v invalid | tail -5<\/span>
Jan\u00a0 1 01:39:54\u00a0 sshd[6417]: Failed password for root from 192.168.1.1 port 53355 ssh2<\/span>
Jan\u00a0 1 01:39:57\u00a0 sshd[6417]: Failed password for root from 192.168.1.1 port 53355 ssh2<\/span>
Jan\u00a0 1 12:18:38\u00a0 sshd[1556]: Failed password for root from 192.168.1.1 port 54849 ssh2<\/span>
Jan\u00a0 1 12:18:41\u00a0 sshd[1556]: Failed password for root from 192.168.1.1 port 54849 ssh2<\/span>
Jan\u00a0 1 12:18:44\u00a0 sshd[1556]: Failed password for root from 192.168.1.1 port 54849 ssh2<\/span><\/p>\n

\u8a2d\u5b9a\u65b9\u5f0f\uff1a
# vim \/etc\/fail2ban\/jail.conf<\/span>
[ssh-iptables]<\/span><\/p>\n

enabled\u00a0 = true<\/span>
filter\u00a0\u00a0 = sshd<\/span>
action\u00a0\u00a0 = iptables[name=SSH, port=ssh, protocol=tcp]<\/span>
#\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 sendmail-whois[name=SSH, dest=you@example.com, sender=fail2ban@example.com]<\/span>
logpath\u00a0 = \/var\/log\/secure<\/span>
maxretry = 3<\/span>
bantime\u00a0 = 86400<\/span>[@more@]\u555f\u7528 ssh-iptables
enabled = true<\/span> <\/p>\n

filter \u662f\u6307\u4f7f\u7528 sshd \u7684 filter \u4f86\u6aa2\u67e5 log \u6a94\u4e2d\u662f\u5426\u6709\u7b26\u5408\u5224\u65b7\u898f\u5247\u7684\u6a23\u5f0f(\u5728 \/etc\/fail2ban\/filter.d \u76ee\u9304\u4e4b\u4e0b)
filter\u00a0\u00a0 = sshd<\/span><\/p>\n

action \u662f\u6307\u5075\u6e2c\u5230\u4e4b\u5f8c\u8981\u63a1\u53d6\u7684\u884c\u52d5\uff0c\u9019\u88e1\u6709\u4e8c\u7a2e\u65b9\u5f0f\uff0ciptables \u662f\u4f7f\u7528 iptables \u4f86\u963b\u64cb\uff0csendmail-whois \u662f\u5bc4\u4fe1\u7d66\u7ba1\u7406\u8005\uff0c\u9019\u4e8c\u7a2e\u884c\u52d5\u7684\u8a2d\u5b9a\uff0c\u53ef\u4ee5\u5728 \/etc\/fail2ban\/action.d \u76ee\u9304\u4e0b\u627e\u5230\u76f8\u95dc\u7684\u8a2d\u5b9a
action\u00a0\u00a0 = iptables[name=SSH, port=ssh, protocol=tcp]<\/span>
\u9019\u88e1\u53ea\u4f7f\u7528 iptables \u4f86\u963b\u64cb\uff0c\u4e0d\u5bc4\u4fe1\u7d66\u7ba1\u7406\u8005<\/p>\n

SSH Server \u767b\u9304\u932f\u8aa4\u7684 Log \u6a94
logpath\u00a0 = \/var\/log\/secure<\/span><\/p>\n

maxretry \u662f\u6307\u5617\u8a66\u932f\u8aa4 3 \u6b21\uff0c\u5c31\u963b\u64cb\uff0cbantime = 86400 \u662f\u6307\u963b\u64cb\u7684\u6642\u9593\uff0c86400 \u662f\u6307\u79d2\uff0c\u6240\u4ee5\u662f\u963b\u64cb 1 \u5929
maxretry = 3<\/span>
bantime\u00a0 = 86400<\/span><\/p>\n

\u91cd\u65b0\u555f\u52d5 fail2ban \u670d\u52d9
# server fail2ban restart<\/span><\/p>\n

\u6aa2\u67e5 fail2ban \u7684\u72c0\u614b
# fail2ban-client status<\/span>
Status<\/span>
|- Number of jail:\u00a0\u00a0\u00a0\u00a0\u00a0 1<\/span>
`- Jail list:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ssh-iptables<\/span><\/span><\/p>\n

\u5217\u51fa\u76ee\u524d\u7684\u9632\u706b\u7246\u898f\u5247
# iptables -L -n<\/span>
Chain INPUT (policy ACCEPT)<\/span>
target\u00a0\u00a0\u00a0\u00a0 prot opt source\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 destination<\/span>
fail2ban-VSFTPD\u00a0 tcp\u00a0 —\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 tcp dpt:21<\/span>
fail2ban-SSH\u00a0 tcp\u00a0 —\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 tcp dpt:22<\/span>
ACCEPT\u00a0\u00a0\u00a0\u00a0 all\u00a0 —\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 state RELATED,ESTABLISHED<\/span>
ACCEPT\u00a0\u00a0\u00a0\u00a0 icmp —\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0<\/span>
ACCEPT\u00a0\u00a0\u00a0\u00a0 all\u00a0 —\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0<\/span>
ACCEPT\u00a0\u00a0\u00a0\u00a0 tcp\u00a0 —\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 state NEW tcp dpt:22<\/span>
ACCEPT\u00a0\u00a0\u00a0\u00a0 tcp\u00a0 —\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 state NEW tcp dpt:21<\/span>
REJECT\u00a0\u00a0\u00a0\u00a0 all\u00a0 —\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 reject-with icmp-host-prohibited<\/span><\/p>\n

Chain FORWARD (policy ACCEPT)<\/span>
target\u00a0\u00a0\u00a0\u00a0 prot opt source\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 destination<\/span>
REJECT\u00a0\u00a0\u00a0\u00a0 all\u00a0 —\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 reject-with icmp-host-prohibited<\/span><\/p>\n

Chain OUTPUT (policy ACCEPT)<\/span>
target\u00a0\u00a0\u00a0\u00a0 prot opt source\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 destination<\/span><\/p>\n

Chain fail2ban-SSH (1 references)<\/span>
target\u00a0\u00a0\u00a0\u00a0 prot opt source\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 destination<\/span>
RETURN\u00a0\u00a0\u00a0\u00a0 all\u00a0 —\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0<\/span><\/p>\n

\u4ee5 Client\u00a0 IP 192.168.1.1 \u5617\u8a66\u5c0d Server IP 192.168.1.9 \u5617\u8a66\u9023\u7dda\u932f\u8aa4\u5e7e\u6b21\u4e4b\u5f8c
\u5217\u51fa fail2ban \u5075\u6e2c\u5230\u7684 SSH \u653b\u64ca
# fail2ban-client status ssh-iptables<\/span>
Status for the jail: ssh-iptables<\/span>
|- filter<\/span>
|\u00a0 |- File list:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/var\/log\/secure<\/span>
|\u00a0 |- Currently failed: 0<\/span>
|\u00a0 `- Total failed:\u00a0\u00a0\u00a0\u00a0 4<\/span>
`- action<\/span>
\u00a0\u00a0 |- Currently banned: 1<\/span>
\u00a0\u00a0 |\u00a0 `- IP list:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 192.168.1.1<\/span>
\u00a0\u00a0 `- Total banned:\u00a0\u00a0\u00a0\u00a0 1<\/span><\/p>\n

\u5217\u51fa fail2ban-SSH \u7684\u898f\u5247
# iptables -t filter -L fail2ban-SSH -n<\/span>
Chain fail2ban-SSH (1 references)<\/span>
target\u00a0\u00a0\u00a0\u00a0 prot opt source\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 destination<\/span>
DROP\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 all\u00a0 —\u00a0 192.168.1.1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0<\/span>
RETURN\u00a0\u00a0\u00a0\u00a0 all\u00a0 —\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0<\/span><\/p>\n

\u89e3\u9664\u65b9\u5f0f\uff1a
# iptables -D fail2ban-SSH\u00a0 -s 192.168.1.1 -j DROP<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

\u5728 \/var\/log\/secure \u4e2d\u5617\u8a66\u4ee5 root \u5e33\u865f\u767b\u5165\u7684\u932f\u8aa4\u8a18\u9304# grep Failed \/var … <\/p>\n

\u95b1\u8b80\u5168\u6587\u3008\u5229\u7528 fail2ban \u963b\u64cb\u4f86\u81ea\u7db2\u8def\u7684 SSH \u9023\u7dda\u653b\u64ca\u3009<\/span><\/a><\/p>\n","protected":false},"author":55,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138,132,139],"tags":[],"class_list":["post-18153","post","type-post","status-publish","format-standard","hentry","category-c-78483","category-c-78477","category-c-78484"],"meta_key":{"_encloseme":["1"],"lt_post_id":["468984"]},"_links":{"self":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/posts\/18153"}],"collection":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/users\/55"}],"replies":[{"embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/comments?post=18153"}],"version-history":[{"count":0,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/posts\/18153\/revisions"}],"wp:attachment":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/media?parent=18153"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/categories?post=18153"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/tags?post=18153"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}