mirror of https://github.com/fail2ban/fail2ban
sshd: conditional parameter "mode" for sshd jail (normal, ddos, aggressive)
filter sshd-ddos and new filter sshd-aggressive are both derivation of sshd-filterpull/1209/head
sebres
sebres
parent
dd373dba9f
commit
628789f9a9
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@ -0,0 +1,11 @@
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# Fail2Ban aggressive ssh filter for at attempted exploit
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#
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# Includes failregex of both sshd and sshd-ddos filters
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#
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[INCLUDES]
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before = sshd.conf
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[Definition]
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mode = %(aggressive)s
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@ -10,20 +10,8 @@
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[INCLUDES]
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# Read common prefixes. If any customizations available -- read them from
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# common.local
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before = common.conf
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before = sshd.conf
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[Definition]
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_daemon = sshd
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failregex = ^%(__prefix_line)sDid not receive identification string from <HOST>\s*$
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ignoreregex =
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[Init]
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journalmatch = _SYSTEMD_UNIT=sshd.service + _COMM=sshd
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# Author: Yaroslav Halchenko
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mode = %(ddos)s
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@ -14,14 +14,14 @@
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# common.local
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before = common.conf
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[Definition]
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[DEFAULT]
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_daemon = sshd
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# optional prefix (logged from several ssh versions) like "error: ", "error: PAM: " or "fatal: "
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__pref = (?:(?:error|fatal): (?:PAM: )?)?
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# optional suffix (logged from several ssh versions) like " [preauth]"
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__suff = (?: \[preauth\])?
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__suff = (?: \[preauth\])?\s*
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# single line prefix:
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__prefix_line_sl = %(__prefix_line)s%(__pref)s
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@ -29,7 +29,9 @@ __prefix_line_sl = %(__prefix_line)s%(__pref)s
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__prefix_line_ml1 = (?P<__prefix>%(__prefix_line)s)%(__pref)s
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__prefix_line_ml2 = %(__suff)s$<SKIPLINES>^(?P=__prefix)%(__pref)s
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failregex = ^%(__prefix_line_sl)s[aA]uthentication (?:failure|error|failed) for .* from <HOST>( via \S+)?\s*%(__suff)s$
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mode = %(normal)s
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normal = ^%(__prefix_line_sl)s[aA]uthentication (?:failure|error|failed) for .* from <HOST>( via \S+)?\s*%(__suff)s$
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^%(__prefix_line_sl)sUser not known to the underlying authentication module for .* from <HOST>\s*%(__suff)s$
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^%(__prefix_line_sl)sFailed \S+ for (?P<cond_inv>invalid user )?(?P<user>(?P<cond_user>\S+)|(?(cond_inv)(?:(?! from ).)*?|[^:]+)) from <HOST>(?: port \d+)?(?: ssh\d*)?(?(cond_user): |(?:(?:(?! from ).)*)$)
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^%(__prefix_line_sl)sROOT LOGIN REFUSED.* FROM <HOST>\s*%(__suff)s$
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@ -38,7 +40,7 @@ failregex = ^%(__prefix_line_sl)s[aA]uthentication (?:failure|error|failed) for
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^%(__prefix_line_sl)sUser .+ from <HOST> not allowed because listed in DenyUsers\s*%(__suff)s$
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^%(__prefix_line_sl)sUser .+ from <HOST> not allowed because not in any group\s*%(__suff)s$
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^%(__prefix_line_sl)srefused connect from \S+ \(<HOST>\)\s*%(__suff)s$
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^%(__prefix_line_sl)sReceived disconnect from <HOST>: (?:3: .*: Auth fail|14: No supported authentication methods available)%(__suff)s$
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^%(__prefix_line_sl)sReceived disconnect from <HOST>: 3: .*: Auth fail%(__suff)s$
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^%(__prefix_line_sl)sUser .+ from <HOST> not allowed because a group is listed in DenyGroups\s*%(__suff)s$
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^%(__prefix_line_sl)sUser .+ from <HOST> not allowed because none of user's groups are listed in AllowGroups\s*%(__suff)s$
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^%(__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$
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@ -46,8 +48,18 @@ failregex = ^%(__prefix_line_sl)s[aA]uthentication (?:failure|error|failed) for
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^%(__prefix_line_ml1)sUser .+ not allowed because account is locked%(__prefix_line_ml2)sReceived disconnect from <HOST>: 11: .+%(__suff)s$
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^%(__prefix_line_ml1)sDisconnecting: Too many authentication failures for .+?%(__prefix_line_ml2)sConnection closed by <HOST>%(__suff)s$
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^%(__prefix_line_ml1)sConnection from <HOST> port \d+(?: on \S+ port \d+)?%(__prefix_line_ml2)sDisconnecting: Too many authentication failures for .+%(__suff)s$
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ddos = ^%(__prefix_line_sl)sDid not receive identification string from <HOST>%(__suff)s$
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^%(__prefix_line_sl)sReceived disconnect from <HOST>: 14: No supported authentication methods available%(__suff)s$
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^%(__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$
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aggressive = %(normal)s
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%(ddos)s
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[Definition]
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failregex = %(mode)s
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ignoreregex =
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[Init]
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@ -223,6 +223,8 @@ action = %(action_)s
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[sshd]
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# To use more aggressive sshd filter (inclusive sshd-ddos failregex):
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#filter = sshd-aggressive
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port = ssh
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logpath = %(sshd_log)s
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backend = %(sshd_backend)s
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@ -597,7 +597,7 @@ class JailsReaderTest(LogCaptureTestCase):
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# grab all filter names
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filters = set(os.path.splitext(os.path.split(a)[1])[0]
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for a in glob.glob(os.path.join('config', 'filter.d', '*.conf'))
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if not a.endswith('common.conf'))
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if not (a.endswith('common.conf') or a.endswith('-aggressive.conf')))
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# get filters of all jails (filter names without options inside filter[...])
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filters_jail = set(
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JailReader.extractOptions(jail.options['filter'])[0] for jail in jails.jails
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@ -169,27 +169,3 @@ Apr 27 13:02:04 host sshd[29116]: Received disconnect from 1.2.3.4: 11: Normal S
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# Match sshd auth errors on OpenSUSE systems
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# failJSON: { "time": "2015-04-16T20:02:50", "match": true , "host": "222.186.21.217", "desc": "Authentication for user failed" }
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2015-04-16T18:02:50.321974+00:00 host sshd[2716]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.21.217 user=root
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# gh-864(1):
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# failJSON: { "match": false }
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Nov 24 23:46:39 host sshd[32686]: SSH: Server;Ltype: Version;Remote: 127.0.0.1-1780;Protocol: 2.0;Client: libssh2_1.4.3
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# failJSON: { "time": "2004-11-24T23:46:43", "match": true , "host": "127.0.0.1", "desc": "Multiline for connection reset by peer (1)" }
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Nov 24 23:46:43 host sshd[32686]: fatal: Read from socket failed: Connection reset by peer [preauth]
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# gh-864(2):
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# failJSON: { "match": false }
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Nov 24 23:46:40 host sshd[32686]: SSH: Server;Ltype: Kex;Remote: 127.0.0.1-1780;Enc: aes128-ctr;MAC: hmac-sha1;Comp: none [preauth]
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# failJSON: { "time": "2004-11-24T23:46:43", "match": true , "host": "127.0.0.1", "desc": "Multiline for connection reset by peer (2)" }
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Nov 24 23:46:43 host sshd[32686]: fatal: Read from socket failed: Connection reset by peer [preauth]
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# gh-864(3):
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# failJSON: { "match": false }
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Nov 24 23:46:41 host sshd[32686]: SSH: Server;Ltype: Authname;Remote: 127.0.0.1-1780;Name: root [preauth]
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# failJSON: { "time": "2004-11-24T23:46:43", "match": true , "host": "127.0.0.1", "desc": "Multiline for connection reset by peer (3)" }
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Nov 24 23:46:43 host sshd[32686]: fatal: Read from socket failed: Connection reset by peer [preauth]
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# several other cases from gh-864:
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# failJSON: { "time": "2004-11-25T01:34:12", "match": true , "host": "127.0.0.1", "desc": "No supported authentication methods" }
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Nov 25 01:34:12 srv sshd[123]: Received disconnect from 127.0.0.1: 14: No supported authentication methods available [preauth]
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# failJSON: { "time": "2004-11-25T01:35:13", "match": true , "host": "127.0.0.1", "desc": "No supported authentication methods" }
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Nov 25 01:35:13 srv sshd[123]: error: Received disconnect from 127.0.0.1: 14: No supported authentication methods available [preauth]
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@ -0,0 +1,3 @@
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# sshd-aggressive includes sshd and sshd-ddos failregex's:
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# addFILE: "sshd"
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# addFILE: "sshd-ddos"
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@ -1,3 +1,27 @@
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# http://forums.powervps.com/showthread.php?t=1667
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# failJSON: { "time": "2005-06-07T01:10:56", "match": true , "host": "69.61.56.114" }
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Jun 7 01:10:56 host sshd[5937]: Did not receive identification string from 69.61.56.114
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# gh-864(1):
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# failJSON: { "match": false }
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Nov 24 23:46:39 host sshd[32686]: SSH: Server;Ltype: Version;Remote: 127.0.0.1-1780;Protocol: 2.0;Client: libssh2_1.4.3
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# failJSON: { "time": "2004-11-24T23:46:43", "match": true , "host": "127.0.0.1", "desc": "Multiline for connection reset by peer (1)" }
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Nov 24 23:46:43 host sshd[32686]: fatal: Read from socket failed: Connection reset by peer [preauth]
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# gh-864(2):
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# failJSON: { "match": false }
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Nov 24 23:46:40 host sshd[32686]: SSH: Server;Ltype: Kex;Remote: 127.0.0.1-1780;Enc: aes128-ctr;MAC: hmac-sha1;Comp: none [preauth]
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# failJSON: { "time": "2004-11-24T23:46:43", "match": true , "host": "127.0.0.1", "desc": "Multiline for connection reset by peer (2)" }
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Nov 24 23:46:43 host sshd[32686]: fatal: Read from socket failed: Connection reset by peer [preauth]
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# gh-864(3):
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# failJSON: { "match": false }
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Nov 24 23:46:41 host sshd[32686]: SSH: Server;Ltype: Authname;Remote: 127.0.0.1-1780;Name: root [preauth]
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# failJSON: { "time": "2004-11-24T23:46:43", "match": true , "host": "127.0.0.1", "desc": "Multiline for connection reset by peer (3)" }
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Nov 24 23:46:43 host sshd[32686]: fatal: Read from socket failed: Connection reset by peer [preauth]
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# several other cases from gh-864:
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# failJSON: { "time": "2004-11-25T01:34:12", "match": true , "host": "127.0.0.1", "desc": "No supported authentication methods" }
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Nov 25 01:34:12 srv sshd[123]: Received disconnect from 127.0.0.1: 14: No supported authentication methods available [preauth]
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# failJSON: { "time": "2004-11-25T01:35:13", "match": true , "host": "127.0.0.1", "desc": "No supported authentication methods" }
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Nov 25 01:35:13 srv sshd[123]: error: Received disconnect from 127.0.0.1: 14: No supported authentication methods available [preauth]
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@ -103,8 +103,13 @@ def testSampleRegexsFactory(name, basedir):
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os.path.isfile(os.path.join(TEST_FILES_DIR, "logs", name)),
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"No sample log file available for '%s' filter" % name)
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logFile = fileinput.FileInput(
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os.path.join(TEST_FILES_DIR, "logs", name))
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regexsUsed = set()
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filenames = [name]
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i = 0
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while i < len(filenames):
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filename = filenames[i]; i += 1;
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logFile = fileinput.FileInput(os.path.join(TEST_FILES_DIR, "logs",
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filename))
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# test regexp contains greedy catch-all before <HOST>, that is
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# not hard-anchored at end or has not precise sub expression after <HOST>:
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@ -114,12 +119,14 @@ def testSampleRegexsFactory(name, basedir):
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"that is not hard-anchored at end or has not precise sub expression after <HOST>:\n%s" %
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(name, str(fr).replace(RE_HOST, '<HOST>')))
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regexsUsed = set()
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for line in logFile:
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jsonREMatch = re.match("^# ?failJSON:(.+)$", line)
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jsonREMatch = re.match("^# ?(failJSON|addFILE):(.+)$", line)
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if jsonREMatch:
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try:
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faildata = json.loads(jsonREMatch.group(1))
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faildata = json.loads(jsonREMatch.group(2))
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if jsonREMatch.group(1) == 'addFILE':
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filenames.append(faildata)
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continue
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except ValueError as e:
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raise ValueError("%s: %s:%i" %
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(e, logFile.filename(), logFile.filelineno()))
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