mirror of https://github.com/fail2ban/fail2ban
Merge pull request #1728 from sebres/_0.10/fix-gh-1719
sebres
commit
bb9541b7a9
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@ -37,24 +37,24 @@ cmnfailre = ^[aA]uthentication (?:failure|error|failed) for <F-USER>.*</F-USER>
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^User <F-USER>.+</F-USER> from <HOST> not allowed because listed in DenyUsers\s*%(__suff)s$
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^User <F-USER>.+</F-USER> from <HOST> not allowed because not in any group\s*%(__suff)s$
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^refused connect from \S+ \(<HOST>\)\s*%(__suff)s$
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^Received disconnect from <HOST>%(__on_port_opt)s:\s*3: .*: Auth fail%(__suff)s$
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^Received <F-MLFFORGET>disconnect</F-MLFFORGET> from <HOST>%(__on_port_opt)s:\s*3: .*: Auth fail%(__suff)s$
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^User <F-USER>.+</F-USER> from <HOST> not allowed because a group is listed in DenyGroups\s*%(__suff)s$
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^User <F-USER>.+</F-USER> from <HOST> not allowed because none of user's groups are listed in AllowGroups\s*%(__suff)s$
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^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$
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^(error: )?maximum authentication attempts exceeded for <F-USER>.*</F-USER> from <HOST>%(__on_port_opt)s(?: ssh\d*)?%(__suff)s$
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^User <F-USER>.+</F-USER> not allowed because account is locked%(__suff)s
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^Disconnecting: Too many authentication failures(?: for <F-USER>.+?</F-USER>)?%(__suff)s
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^<F-NOFAIL>Received disconnect</F-NOFAIL> from <HOST>: 11:
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^<F-NOFAIL>Connection closed</F-NOFAIL> by <HOST>%(__suff)s$
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^<F-MLFFORGET>Disconnecting</F-MLFFORGET>: Too many authentication failures(?: for <F-USER>.+?</F-USER>)?%(__suff)s
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^<F-NOFAIL>Received <F-MLFFORGET>disconnect</F-MLFFORGET></F-NOFAIL> from <HOST>: 11:
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^<F-NOFAIL>Connection <F-MLFFORGET>closed</F-MLFFORGET></F-NOFAIL> by <HOST>%(__suff)s$
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mdre-normal =
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mdre-ddos = ^Did not receive identification string from <HOST>%(__suff)s$
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^Connection reset by <HOST>%(__on_port_opt)s%(__suff)s
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^Connection <F-MLFFORGET>reset</F-MLFFORGET> by <HOST>%(__on_port_opt)s%(__suff)s
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^<F-NOFAIL>SSH: Server;Ltype:</F-NOFAIL> (?:Authname|Version|Kex);Remote: <HOST>-\d+;[A-Z]\w+:
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^Read from socket failed: Connection reset by peer%(__suff)s
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^Read from socket failed: Connection <F-MLFFORGET>reset</F-MLFFORGET> by peer%(__suff)s
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mdre-extra = ^Received disconnect from <HOST>%(__on_port_opt)s:\s*14: No supported authentication methods available%(__suff)s$
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mdre-extra = ^Received <F-MLFFORGET>disconnect</F-MLFFORGET> from <HOST>%(__on_port_opt)s:\s*14: No supported authentication methods available%(__suff)s$
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^Unable to negotiate with <HOST>%(__on_port_opt)s: no matching (?:cipher|key exchange method) found.
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^Unable to negotiate a (?:cipher|key exchange method)%(__suff)s$
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@ -220,8 +220,8 @@ class JailReader(ConfigReader):
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if self.__filter:
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stream.extend(self.__filter.convert())
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for opt, value in self.__opts.iteritems():
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if opt == "logpath" and \
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not self.__opts.get('backend', None).startswith("systemd"):
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if opt == "logpath":
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if self.__opts.get('backend', None).startswith("systemd"): continue
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found_files = 0
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for path in value.split("\n"):
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path = path.rsplit(" ", 1)
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@ -550,24 +550,29 @@ class Filter(JailThread):
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def _mergeFailure(self, mlfid, fail, failRegex):
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mlfidFail = self.mlfidCache.get(mlfid) if self.__mlfidCache else None
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# if multi-line failure id (connection id) known:
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if mlfidFail:
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mlfidGroups = mlfidFail[1]
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# if current line not failure, but previous was failure:
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if fail.get('nofail') and not mlfidGroups.get('nofail'):
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del fail['nofail'] # remove nofail flag - was already market as failure
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self.mlfidCache.unset(mlfid) # remove cache entry
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# if current line is failure, but previous was not:
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elif not fail.get('nofail') and mlfidGroups.get('nofail'):
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del mlfidGroups['nofail'] # remove nofail flag
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self.mlfidCache.unset(mlfid) # remove cache entry
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# update - if not forget (disconnect/reset):
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if not fail.get('mlfforget'):
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mlfidGroups.update(fail)
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else:
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self.mlfidCache.unset(mlfid) # remove cached entry
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# merge with previous info:
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fail2 = mlfidGroups.copy()
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fail2.update(fail)
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if not fail.get('nofail'): # be sure we've correct current state
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try:
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del fail2['nofail']
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except KeyError:
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pass
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fail2["matches"] = fail.get("matches", []) + failRegex.getMatchedTupleLines()
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fail = fail2
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elif fail.get('nofail'):
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fail["matches"] = failRegex.getMatchedTupleLines()
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elif not fail.get('mlfforget'):
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mlfidFail = [self.__lastDate, fail]
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self.mlfidCache.set(mlfid, mlfidFail)
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if fail.get('nofail'):
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fail["matches"] = failRegex.getMatchedTupleLines()
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return fail
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@ -683,6 +688,11 @@ class Filter(JailThread):
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mlfid = fail.get('mlfid')
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if mlfid is not None:
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fail = self._mergeFailure(mlfid, fail, failRegex)
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# bypass if no-failure case:
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if fail.get('nofail'):
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logSys.log(7, "Nofail by mlfid %r in regex %s: %s",
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mlfid, failRegexIndex, fail.get('mlfforget', "waiting for failure"))
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if not self.checkAllRegex: return failList
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else:
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# matched lines:
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fail["matches"] = fail.get("matches", []) + failRegex.getMatchedTupleLines()
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@ -702,18 +712,16 @@ class Filter(JailThread):
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host = fail.get('dns')
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if host is None:
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# first try to check we have mlfid case (cache connection id):
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if fid is None:
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if mlfid:
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fail = self._mergeFailure(mlfid, fail, failRegex)
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else:
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if fid is None and mlfid is None:
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# if no failure-id also (obscure case, wrong regex), throw error inside getFailID:
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fid = failRegex.getFailID()
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host = fid
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cidr = IPAddr.CIDR_RAW
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# if mlfid case (not failure):
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if host is None:
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if not self.checkAllRegex: # or fail.get('nofail'):
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return failList
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logSys.log(7, "No failure-id by mlfid %r in regex %s: %s",
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mlfid, failRegexIndex, fail.get('mlfforget', "waiting for identifier"))
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if not self.checkAllRegex: return failList
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ips = [None]
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# if raw - add single ip or failure-id,
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# otherwise expand host to multiple ips using dns (or ignore it if not valid):
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@ -113,6 +113,11 @@ May 27 00:16:33 host sshd[2364]: Received disconnect from 198.51.100.76: 11: Bye
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# failJSON: { "time": "2004-09-29T16:28:02", "match": true , "host": "127.0.0.1" }
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Sep 29 16:28:02 spaceman sshd[16699]: Failed password for dan from 127.0.0.1 port 45416 ssh1
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# failJSON: { "match": false, "desc": "no failure, just cache mlfid (conn-id)" }
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Sep 29 16:28:05 localhost sshd[16700]: Connection from 192.0.2.5
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# failJSON: { "match": false, "desc": "no failure, just covering mlfid (conn-id) forget" }
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Sep 29 16:28:05 localhost sshd[16700]: Connection closed by 192.0.2.5 [preauth]
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# failJSON: { "time": "2004-09-29T17:15:02", "match": true , "host": "127.0.0.1" }
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Sep 29 17:15:02 spaceman sshd[12946]: Failed hostbased for dan from 127.0.0.1 port 45785 ssh2: RSA 8c:e3:aa:0f:64:51:02:f7:14:79:89:3f:65:84:7c:30, client user "dan", client host "localhost.localdomain"
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@ -233,4 +238,6 @@ Nov 26 13:03:30 srv sshd[45]: fatal: Unable to negotiate with 192.0.2.2 port 554
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# failJSON: { "match": false }
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Nov 26 15:03:30 host sshd[22440]: Connection from 192.0.2.3 port 39678 on 192.168.1.9 port 22
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# failJSON: { "time": "2004-11-26T15:03:31", "match": true , "host": "192.0.2.3", "desc": "Multiline - no matching key exchange method" }
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Nov 26 15:03:31 host sshd[22440]: fatal: Unable to negotiate a key exchange method [preauth]
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Nov 26 15:03:31 host sshd[22440]: fatal: Unable to negotiate a key exchange method [preauth]
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# failJSON: { "time": "2004-11-26T15:03:32", "match": true , "host": "192.0.2.3", "filter": "sshd", "desc": "Second attempt within the same connect" }
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Nov 26 15:03:32 host sshd[22440]: fatal: Unable to negotiate a key exchange method [preauth]
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@ -182,6 +182,9 @@ def testSampleRegexsFactory(name, basedir):
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try:
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ret = self.filter.processLine(line)
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if not ret:
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# Bypass if filter constraint specified:
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if faildata.get('filter') and name != faildata.get('filter'):
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continue
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# Check line is flagged as none match
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self.assertFalse(faildata.get('match', True),
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"Line not matched when should have")
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@ -200,13 +203,13 @@ def testSampleRegexsFactory(name, basedir):
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self.assertEqual(len(ret), 1,
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"Multiple regexs matched %r" % (map(lambda x: x[0], ret)))
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# Fallback for backwards compatibility (previously no fid, was host only):
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if faildata.get("host", None) is not None and fail.get("host", None) is None:
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fail["host"] = fid
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# Verify match captures (at least fid/host) and timestamp as expected
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for k, v in faildata.iteritems():
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if k not in ("time", "match", "desc"):
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if k not in ("time", "match", "desc", "filter"):
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fv = fail.get(k, None)
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# Fallback for backwards compatibility (previously no fid, was host only):
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if k == "host" and fv is None:
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fv = fid
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self.assertEqual(fv, v)
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t = faildata.get("time", None)
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