Merge pull request #1539 from sebres/_0.10/fix-gh-1529

0.10/fix-gh-1529

fail2ban/server/datedetector.py

@@ -224,12 +224,15 @@ class DateDetector(object):
 		if timeMatch:
 			template = timeMatch[1]
 			if template is not None:
-				date = template.getDate(line, timeMatch[0])
+				try:
-				if date is not None:
+					date = template.getDate(line, timeMatch[0])
-					if logSys.getEffectiveLevel() <= logLevel:
+					if date is not None:
-						logSys.log(logLevel, "Got time %f for \"%r\" using template %s",
+						if logSys.getEffectiveLevel() <= logLevel:
-							date[0], date[1].group(), template.name)
+							logSys.log(logLevel, "Got time %f for %r using template %s",
-					return date
+								date[0], date[1].group(), template.name)
+						return date
+				except ValueError:
+					return None
 		with self.__lock:
 			for template in self.__templates:
 				try:
@@ -237,7 +240,7 @@ class DateDetector(object):
 					if date is None:
 						continue
 					if logSys.getEffectiveLevel() <= logLevel:
-						logSys.log(logLevel, "Got time %f for \"%r\" using template %s", 
+						logSys.log(logLevel, "Got time %f for %r using template %s", 
 							date[0], date[1].group(), template.name)
 					return date
 				except ValueError: # pragma: no cover

fail2ban/server/filter.py

@@ -29,6 +29,7 @@ import logging
 import os
 import re
 import sys
+import time
 
 from .failmanager import FailManagerEmpty, FailManager
 from .ipdns import DNSUtils, IPAddr
@@ -85,6 +86,8 @@ class Filter(JailThread):
 		self.__lastDate = None
 		## External command
 		self.__ignoreCommand = False
+		## Error counter
+		self.__errors = 0
 
 		self.dateDetector = DateDetector()
 		self.dateDetector.addDefaultTemplate()
@@ -414,26 +417,41 @@ class Filter(JailThread):
 	def processLineAndAdd(self, line, date=None):
 		"""Processes the line for failures and populates failManager
 		"""
-		for element in self.processLine(line, date)[1]:
+		try:
-			ip = element[1]
+			for element in self.processLine(line, date)[1]:
-			unixTime = element[2]
+				ip = element[1]
-			lines = element[3]
+				unixTime = element[2]
-			fail = {}
+				lines = element[3]
-			if len(element) > 4:
+				fail = {}
-				fail = element[4]
+				if len(element) > 4:
-			logSys.debug("Processing line with time:%s and ip:%s", 
+					fail = element[4]
-					unixTime, ip)
+				logSys.debug("Processing line with time:%s and ip:%s", 
-			if unixTime < MyTime.time() - self.getFindTime():
+						unixTime, ip)
-				logSys.debug("Ignore line since time %s < %s - %s", 
+				if unixTime < MyTime.time() - self.getFindTime():
-					unixTime, MyTime.time(), self.getFindTime())
+					logSys.debug("Ignore line since time %s < %s - %s", 
-				break
+						unixTime, MyTime.time(), self.getFindTime())
-			if self.inIgnoreIPList(ip, log_ignore=True):
+					break
-				continue
+				if self.inIgnoreIPList(ip, log_ignore=True):
-			logSys.info(
+					continue
-				"[%s] Found %s - %s", self.jail.name, ip, datetime.datetime.fromtimestamp(unixTime).strftime("%Y-%m-%d %H:%M:%S")
+				logSys.info(
-			)
+					"[%s] Found %s - %s", self.jail.name, ip, datetime.datetime.fromtimestamp(unixTime).strftime("%Y-%m-%d %H:%M:%S")
-			tick = FailTicket(ip, unixTime, lines, data=fail)
+				)
-			self.failManager.addFailure(tick)
+				tick = FailTicket(ip, unixTime, lines, data=fail)
+				self.failManager.addFailure(tick)
+			# reset (halve) error counter (successfully processed line):
+			if self.__errors:
+				self.__errors //= 2
+		except Exception as e:
+			logSys.error("Failed to process line: %r, caught exception: %r", line, e,
+				exc_info=logSys.getEffectiveLevel()<=logging.DEBUG)
+			# incr error counter, stop processing (going idle) after 100th error :
+			self.__errors += 1
+			# sleep a little bit (to get around time-related errors):
+			time.sleep(self.sleeptime)
+			if self.__errors >= 100:
+				logSys.error("Too many errors at once (%s), going idle", self.__errors)
+				self.__errors //= 2
+				self.idle = True
 
 	##
 	# Returns true if the line should be ignored.

fail2ban/tests/files/logs/zzz-generic-example

@@ -29,3 +29,19 @@ Jun 21 16:55:02   <auth.info> machine kernel: [  970.699396] @vserver_demo test-
 # -- the same as above with brackets as date ambit --
 # failJSON: { "time": "2005-06-21T16:55:03", "match": true , "host": "192.0.2.3" }
 [Jun 21 16:55:03] <auth.info> machine kernel: [  970.699396] @vserver_demo test-demo(pam_unix)[13709] [ID 255 test] F2B: failure from 192.0.2.3
+
+# -- wrong time direct in journal-line (used last known date):
+# failJSON: { "time": "2005-06-21T16:55:03", "match": true , "host": "192.0.2.1" }
+0000-12-30 00:00:00 server test-demo[47831]:  F2B: failure from 192.0.2.1
+# -- wrong time after newline in message (plist without escaped newlines):
+# failJSON: { "match": false }
+Jun 22 20:37:04 server test-demo[402]: writeToStorage plist={
+# failJSON: { "match": false }
+             absentCircleWithNoReason = 0;
+# failJSON: { "match": false }
+             applicationDate = "0000-12-30 00:00:00 +0000";
+# failJSON: { "match": false }
+}
+# -- wrong time direct in journal-line (used last known date):
+# failJSON: { "time": "2005-06-22T20:37:04", "match": true , "host": "192.0.2.2" }
+0000-12-30 00:00:00 server test-demo[47831]:  F2B: failure from 192.0.2.2

fail2ban/tests/filtertestcase.py

@@ -604,6 +604,28 @@ class LogFileMonitor(LogCaptureTestCase):
 		self.filter.getFailures(self.name)
 		self.assertLogged('Unable to open %s' % self.name)
 
+	def testErrorProcessLine(self):
+		self.filter.sleeptime /= 1000.0
+		## produce error with not callable processLine:
+		_org_processLine = self.filter.processLine
+		self.filter.processLine = None
+		for i in range(100):
+			self.file.write("line%d\n" % 1)
+		self.file.flush()
+		for i in range(100):
+			self.filter.getFailures(self.name)
+		self.assertLogged('Failed to process line:')
+		self.assertLogged('Too many errors at once')
+		self.pruneLog()
+		self.assertTrue(self.filter.idle)
+		self.filter.idle = False
+		self.filter.getFailures(self.name)
+		self.filter.processLine = _org_processLine
+		self.file.write("line%d\n" % 1)
+		self.file.flush()
+		self.filter.getFailures(self.name)
+		self.assertNotLogged('Failed to process line:')
+
 	def testRemovingFailRegex(self):
 		self.filter.delFailRegex(0)
 		self.assertNotLogged('Cannot remove regular expression. Index 0 is not valid')