introduced new options: `dbmaxmatches` (fail2ban.conf) and `maxmatches` (jail.conf);

setting `maxmatches` and `dbmaxmatches` to 0 saves memory usage and database size (closes gh-2118).

config/fail2ban.conf

@@ -68,6 +68,12 @@ dbfile = /var/lib/fail2ban/fail2ban.sqlite3
 # Values: [ SECONDS ] Default: 86400 (24hours)
 dbpurgeage = 1d
 
+# Options: dbmaxmatches
+# Notes.: Number of matches stored in database per ticket (resolvable via 
+#         tags <ipmatches>/<ipjailmatches> in actions)
+# Values: [ INT ] Default: 10
+dbmaxmatches = 10
+
 [Thread]
 
 # Options: stacksize

config/jail.conf

@@ -69,6 +69,9 @@ findtime  = 10m
 # "maxretry" is the number of failures before a host get banned.
 maxretry = 5
 
+# "maxmatches" is the number of matches stored in ticket (resolvable via tag <matches> in actions).
+maxmatches = %(maxretry)s
+
 # "backend" specifies the backend used to get files modification.
 # Available options are "pyinotify", "gamin", "polling", "systemd" and "auto".
 # This option can be overridden in each jail as well.

fail2ban/client/fail2banreader.py

@@ -54,6 +54,7 @@ class Fail2banReader(ConfigReader):
 				["string", "logtarget", "STDERR"],
 				["string", "syslogsocket", "auto"],
 				["string", "dbfile", "/var/lib/fail2ban/fail2ban.sqlite3"],
+				["int",    "dbmaxmatches", None],
 				["string", "dbpurgeage", "1d"]]
 		self.__opts = ConfigReader.getOptions(self, "Definition", opts)
 		if updateMainOpt:
@@ -73,7 +74,7 @@ class Fail2banReader(ConfigReader):
 		# Also dbfile should be set before all other database options.
 		# So adding order indices into items, to be stripped after sorting, upon return
 		order = {"thread":0, "syslogsocket":11, "loglevel":12, "logtarget":13,
-			"dbfile":50, "dbpurgeage":51}
+			"dbfile":50, "dbmaxmatches":51, "dbpurgeage":51}
 		stream = list()
 		for opt in self.__opts:
 			if opt in order:

fail2ban/client/jailreader.py

@@ -93,6 +93,7 @@ class JailReader(ConfigReader):
 		opts = [["bool", "enabled", False],
 				["string", "backend", "auto"],
 				["int",    "maxretry", None],
+				["int",    "maxmatches", None],
 				["string", "findtime", None],
 				["string", "bantime", None],
 				["string", "usedns", None], # be sure usedns is before all regex(s) in stream

fail2ban/server/server.py

@@ -443,6 +443,12 @@ class Server:
 	def getUseDns(self, name):
 		return self.__jails[name].filter.getUseDns()
 	
+	def setMaxMatches(self, name, value):
+		self.__jails[name].filter.failManager.maxMatches = value
+	
+	def getMaxMatches(self, name):
+		return self.__jails[name].filter.failManager.maxMatches
+	
 	def setMaxRetry(self, name, value):
 		self.__jails[name].filter.setMaxRetry(value)
 	

fail2ban/server/transmitter.py

@@ -183,6 +183,15 @@ class Transmitter:
 			else:
 				if self.__quiet: return
 				return db.filename
+		elif name == "dbmaxmatches":
+			db = self.__server.getDatabase()
+			if db is None:
+				logSys.msg("dbmaxmatches setting was not in effect since no db yet")
+				return None
+			else:
+				db.maxMatches = int(command[1])
+				if self.__quiet: return
+				return db.maxMatches
 		elif name == "dbpurgeage":
 			db = self.__server.getDatabase()
 			if db is None:
@@ -310,6 +319,11 @@ class Transmitter:
 			self.__server.setLogTimeZone(name, value)
 			if self.__quiet: return
 			return self.__server.getLogTimeZone(name)
+		elif command[1] == "maxmatches":
+			value = command[2]
+			self.__server.setMaxMatches(name, int(value))
+			if self.__quiet: return
+			return self.__server.getMaxMatches(name)
 		elif command[1] == "maxretry":
 			value = command[2]
 			self.__server.setMaxRetry(name, int(value))
@@ -398,6 +412,12 @@ class Transmitter:
 				return None
 			else:
 				return db.filename
+		elif name == "dbmaxmatches":
+			db = self.__server.getDatabase()
+			if db is None:
+				return None
+			else:
+				return db.maxMatches
 		elif name == "dbpurgeage":
 			db = self.__server.getDatabase()
 			if db is None:
@@ -433,6 +453,8 @@ class Transmitter:
 			return self.__server.getDatePattern(name)
 		elif command[1] == "logtimezone":
 			return self.__server.getLogTimeZone(name)
+		elif command[1] == "maxmatches":
+			return self.__server.getMaxMatches(name)
 		elif command[1] == "maxretry":
 			return self.__server.getMaxRetry(name)
 		elif command[1] == "maxlines":

fail2ban/tests/clientreadertestcase.py

@@ -881,18 +881,20 @@ class JailsReaderTest(LogCaptureTestCase):
 		self.assertTrue(
 			find_set('syslogsocket') < find_set('loglevel') < find_set('logtarget')
 		)
-		# then dbfile should be before dbpurgeage
+		# then dbfile should be before dbmaxmatches and dbpurgeage
 		self.assertTrue(find_set('dbpurgeage') > find_set('dbfile'))
+		self.assertTrue(find_set('dbmaxmatches') > find_set('dbfile'))
 
 		# and there is logging information left to be passed into the
 		# server
-		self.assertSortedEqual(commands,
+		self.assertSortedEqual(commands,[
-						 [['set', 'dbfile',
+		  ['set', 'syslogsocket', 'auto'],
-								'/var/lib/fail2ban/fail2ban.sqlite3'],
-						  ['set', 'dbpurgeage', '1d'],
 		  ['set', 'loglevel', "INFO"],
 		  ['set', 'logtarget', '/var/log/fail2ban.log'],
-						  ['set', 'syslogsocket', 'auto']])
+		  ['set', 'dbfile', '/var/lib/fail2ban/fail2ban.sqlite3'],
+		  ['set', 'dbmaxmatches', 10],
+		  ['set', 'dbpurgeage', '1d'],
+		 ])
 
 		# and if we force change configurator's fail2ban's baseDir
 		# there should be an error message (test visually ;) --

fail2ban/tests/fail2banclienttestcase.py

@@ -179,6 +179,7 @@ def _start_params(tmp, use_stock=False, use_stock_cfg=None,
 			"pidfile = " + pjoin(tmp, "f2b.pid"),
 			"backend = polling",
 			"dbfile = " + db,
+			"dbmaxmatches = 100",
 			"dbpurgeage = 1d",
 			"",
 		)

fail2ban/tests/servertestcase.py

@@ -374,6 +374,12 @@ class Transmitter(TransmitterBase):
 		self.assertLogged("Ban 192.0.2.2", wait=True)
 		self.assertNotLogged("Ban 192.0.2.1")
 
+	def testJailMaxMatches(self):
+		self.setGetTest("maxmatches", "5", 5, jail=self.jailName)
+		self.setGetTest("maxmatches", "2", 2, jail=self.jailName)
+		self.setGetTest("maxmatches", "-2", -2, jail=self.jailName)
+		self.setGetTestNOK("maxmatches", "Duck", jail=self.jailName)
+
 	def testJailMaxRetry(self):
 		self.setGetTest("maxretry", "5", 5, jail=self.jailName)
 		self.setGetTest("maxretry", "2", 2, jail=self.jailName)