github
/
fail2ban
mirror of https://github.com/fail2ban/fail2ban
1
0
Fork 0
Code Issues Releases Wiki Activity

filter.d/sshd.conf: fixed failregex format - some parts are optional, new ddos more precise rule (Connection reset by with host entry); 

closes gh-1719
pull/1720/head
sebres 2017-03-15 18:00:53 +01:00
parent 97d417926d
commit 5561423be3
3 changed files with 13 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
config/filter.d/sshd.conf
View File

@ -41,17 +41,18 @@ cmnfailre = ^[aA]uthentication (?:failure|error|failed) for <F-USER>.*</F-USER>
^User <F-USER>.+</F-USER> from <HOST> not allowed because a group is listed in DenyGroups\s*%(__suff)s$
^User <F-USER>.+</F-USER> from <HOST> not allowed because none of user's groups are listed in AllowGroups\s*%(__suff)s$
^pam_unix\(sshd:auth\):\s+authentication failure;\s*logname=\S*\s*uid=\d*\s*euid=\d*\s*tty=\S*\s*ruser=<F-USER>\S*</F-USER>\s*rhost=<HOST>\s.*%(__suff)s$
^(error: )?maximum authentication attempts exceeded for <F-USER>.*</F-USER> from <HOST>%(__on_port_opt)s(?: ssh\d*)? \[preauth\]$
^(error: )?maximum authentication attempts exceeded for <F-USER>.*</F-USER> from <HOST>%(__on_port_opt)s(?: ssh\d*)?%(__suff)s$
^User <F-USER>.+</F-USER> not allowed because account is locked%(__suff)s
^Disconnecting: Too many authentication failures for <F-USER>.+?</F-USER>%(__suff)s
^Disconnecting: Too many authentication failures(?: for <F-USER>.+?</F-USER>)?%(__suff)s
^<F-NOFAIL>Received disconnect</F-NOFAIL> from <HOST>: 11:
^<F-NOFAIL>Connection closed</F-NOFAIL> by <HOST>%(__suff)s$
mdre-normal =
mdre-ddos = ^Did not receive identification string from <HOST>%(__suff)s$
^Connection reset by <HOST>%(__on_port_opt)s%(__suff)s
^<F-NOFAIL>SSH: Server;Ltype:</F-NOFAIL> (?:Authname|Version|Kex);Remote: <HOST>-\d+;[A-Z]\w+:
^Read from socket failed: Connection reset by peer \[preauth\]
^Read from socket failed: Connection reset by peer%(__suff)s
mdre-extra = ^Received disconnect from <HOST>%(__on_port_opt)s:\s*14: No supported authentication methods available%(__suff)s$
^Unable to negotiate with <HOST>%(__on_port_opt)s: no matching (?:cipher|key exchange method) found.

5
fail2ban/tests/config/filter.d/zzz-sshd-obsolete-multiline.conf
View File

@ -40,12 +40,13 @@ cmnfailre = ^%(__prefix_line_sl)s[aA]uthentication (?:failure|error|failed) for
^%(__prefix_line_sl)spam_unix\(sshd:auth\):\s+authentication failure;\s*logname=\S*\s*uid=\d*\s*euid=\d*\s*tty=\S*\s*ruser=\S*\s*rhost=<HOST>\s.*%(__suff)s$
^%(__prefix_line_sl)s(error: )?maximum authentication attempts exceeded for .* from <HOST>%(__on_port_opt)s(?: ssh\d*)? \[preauth\]$
^%(__prefix_line_ml1)sUser .+ not allowed because account is locked%(__prefix_line_ml2)sReceived disconnect from <HOST>: 11: .+%(__suff)s$
^%(__prefix_line_ml1)sDisconnecting: Too many authentication failures for .+?%(__prefix_line_ml2)sConnection closed by <HOST>%(__suff)s$
^%(__prefix_line_ml1)sConnection from <HOST>%(__on_port_opt)s%(__prefix_line_ml2)sDisconnecting: Too many authentication failures for .+%(__suff)s$
^%(__prefix_line_ml1)sDisconnecting: Too many authentication failures(?: for .+?)?%(__suff)s%(__prefix_line_ml2)sConnection closed by <HOST>%(__suff)s$
^%(__prefix_line_ml1)sConnection from <HOST>%(__on_port_opt)s%(__prefix_line_ml2)sDisconnecting: Too many authentication failures(?: for .+?)?%(__suff)s$
mdre-normal =
mdre-ddos = ^%(__prefix_line_sl)sDid not receive identification string from <HOST>%(__suff)s$
^%(__prefix_line_sl)sConnection reset by <HOST>%(__on_port_opt)s%(__suff)s
^%(__prefix_line_ml1)sSSH: Server;Ltype: (?:Authname|Version|Kex);Remote: <HOST>-\d+;[A-Z]\w+:.*%(__prefix_line_ml2)sRead from socket failed: Connection reset by peer%(__suff)s$
mdre-extra = ^%(__prefix_line_sl)sReceived disconnect from <HOST>%(__on_port_opt)s:\s*14: No supported authentication methods available%(__suff)s$

7
fail2ban/tests/files/logs/sshd
View File

@ -168,7 +168,7 @@ Feb 12 04:09:21 localhost sshd[26713]: Disconnecting: Too many authentication fa
# failJSON: { "match": false }
Feb 12 04:09:18 localhost sshd[26713]: Connection from 115.249.163.77 port 51353 on 127.0.0.1 port 22
# failJSON: { "time": "2005-02-12T04:09:21", "match": true , "host": "115.249.163.77", "desc": "Multiline match with interface address" }
Feb 12 04:09:21 localhost sshd[26713]: Disconnecting: Too many authentication failures for root [preauth]
Feb 12 04:09:21 localhost sshd[26713]: Disconnecting: Too many authentication failures [preauth]
# failJSON: { "time": "2004-11-23T21:50:37", "match": true , "host": "61.0.0.1", "desc": "New logline format as openssh 6.8 to replace prev multiline version" }
Nov 23 21:50:37 myhost sshd[21810]: error: maximum authentication attempts exceeded for root from 61.0.0.1 port 49940 ssh2 [preauth]
@ -208,6 +208,11 @@ Nov 24 23:46:41 host sshd[32686]: SSH: Server;Ltype: Authname;Remote: 127.0.0.1-
# failJSON: { "time": "2004-11-24T23:46:43", "match": true , "host": "127.0.0.1", "desc": "Multiline for connection reset by peer (3)" }
Nov 24 23:46:43 host sshd[32686]: fatal: Read from socket failed: Connection reset by peer [preauth]
# gh-1719:
# failJSON: { "time": "2005-03-15T09:20:57", "match": true , "host": "192.0.2.39", "desc": "Singleline for connection reset by" }
Mar 15 09:20:57 host sshd[28972]: Connection reset by 192.0.2.39 port 14282 [preauth]
# filterOptions: {"mode": "extra"}
# several other cases from gh-864: