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Initial changes and test for multi-line filtering

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pull/108/head
Steven Hiscocks 12 years ago
parent 51a3be2d79
commit aec709f4c1
9 changed files with 83 additions and 2 deletions
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3
client/jailreader.py
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@ -63,6 +63,7 @@ class JailReader(ConfigReader):
["string", "logpath", "/var/log/messages"],
["string", "backend", "auto"],
["int", "maxretry", 3],
["int", "maxlines", 1],
["int", "findtime", 600],
["int", "bantime", 600],
["string", "usedns", "warn"],
@ -114,6 +115,8 @@ class JailReader(ConfigReader):
backend = self.__opts[opt]
elif opt == "maxretry":
stream.append(["set", self.__name, "maxretry", self.__opts[opt]])
elif opt == "maxlines":
stream.append(["set", self.__name, "maxlines", self.__opts[opt]])
elif opt == "ignoreip":
for ip in self.__opts[opt].split():
# Do not send a command if the rule is empty.

2
common/protocol.py
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@ -66,6 +66,7 @@ protocol = [
["set <JAIL> banip <IP>", "manually Ban <IP> for <JAIL>"],
["set <JAIL> unbanip <IP>", "manually Unban <IP> in <JAIL>"],
["set <JAIL> maxretry <RETRY>", "sets the number of failures <RETRY> before banning the host for <JAIL>"],
["set <JAIL> maxlines <LINES>", "sets the number of <LINES> to buffer for regex search for <JAIL>"],
["set <JAIL> addaction <ACT>", "adds a new action named <NAME> for <JAIL>"],
["set <JAIL> delaction <ACT>", "removes the action <NAME> from <JAIL>"],
["set <JAIL> setcinfo <ACT> <KEY> <VALUE>", "sets <VALUE> for <KEY> of the action <NAME> for <JAIL>"],
@ -84,6 +85,7 @@ protocol = [
["get <JAIL> bantime", "gets the time a host is banned for <JAIL>"],
["get <JAIL> usedns", "gets the usedns setting for <JAIL>"],
["get <JAIL> maxretry", "gets the number of failures allowed for <JAIL>"],
["get <JAIL> maxlines", "gets the number of lines to buffer for <JAIL>"],
["get <JAIL> addaction", "gets the last action which has been added for <JAIL>"],
["get <JAIL> actionstart <ACT>", "gets the start command for the action <ACT> for <JAIL>"],
["get <JAIL> actionstop <ACT>", "gets the stop command for the action <ACT> for <JAIL>"],

9
man/fail2ban-client.1
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@ -145,6 +145,11 @@ sets the number of failures
<RETRY> before banning the host
for <JAIL>
.TP
\fBset <JAIL> maxlines <LINES>\fR
sets the number of <LINES> to
buffer for regex search for
<JAIL>
.TP
\fBset <JAIL> addaction <ACT>\fR
adds a new action named <NAME> for
<JAIL>
@ -222,6 +227,10 @@ gets the time a host is banned for
gets the number of failures
allowed for <JAIL>
.TP
\fBget <JAIL> maxlines\fR
gets the number lines to
buffer for <JAIL>
.TP
\fBget <JAIL> addaction\fR
gets the last action which has
been added for <JAIL>

2
server/failregex.py
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@ -51,7 +51,7 @@ class Regex:
if regex.lstrip() == '':
raise RegexException("Cannot add empty regex")
try:
self._regexObj = re.compile(regex)
self._regexObj = re.compile(regex, re.MULTILINE)
self._regex = regex
except sre_constants.error:
raise RegexException("Unable to compile regular expression '%s'" %

30
server/filter.py
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@ -36,6 +36,7 @@ from mytime import MyTime
from failregex import FailRegex, Regex, RegexException
import logging, re, os, fcntl, time
from collections import deque
# Gets the instance of the logger.
logSys = logging.getLogger("fail2ban.filter")
@ -71,6 +72,10 @@ class Filter(JailThread):
self.__findTime = 6000
## The ignore IP list.
self.__ignoreIpList = []
## Size of line buffer
self.__line_buffer_size = 1
## Line buffer
self.__line_buffer = deque()
self.dateDetector = DateDetector()
self.dateDetector.addDefaultTemplate()
@ -204,6 +209,25 @@ class Filter(JailThread):
def getMaxRetry(self):
return self.failManager.getMaxRetry()
##
# Set the maximum line buffer size.
#
# @param value the line buffer size
def setMaxLines(self, value):
if value < 1:
value = 1
self.__line_buffer_size = value
logSys.info("Set maxLines = %s" % value)
##
# Get the maximum line buffer size.
#
# @return the line buffer size
def getMaxLines(self):
return self.__line_buffer_size
##
# Main loop.
#
@ -305,7 +329,10 @@ class Filter(JailThread):
else:
timeLine = l
logLine = l
return self.findFailure(timeLine, logLine)
self.__line_buffer.append(logLine)
while len(self.__line_buffer) > self.__line_buffer_size:
self.__line_buffer.popleft()
return self.findFailure(timeLine, "".join(self.__line_buffer))
def processLineAndAdd(self, line):
"""Processes the line for failures and populates failManager
@ -365,6 +392,7 @@ class Filter(JailThread):
"in order to get support for this format."
% (logLine, timeLine))
else:
self.__line_buffer.clear()
try:
host = failRegex.getHost()
ipMatch = DNSUtils.textToIp(host, self.__useDns)

6
server/server.py
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@ -216,6 +216,12 @@ class Server:
def getMaxRetry(self, name):
return self.__jails.getFilter(name).getMaxRetry()
def setMaxLines(self, name, value):
self.__jails.getFilter(name).setMaxLines(value)
def getMaxLines(self, name):
return self.__jails.getFilter(name).getMaxLines()
# Action
def addAction(self, name, value):
self.__jails.getAction(name).addAction(value)

6
server/transmitter.py
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@ -167,6 +167,10 @@ class Transmitter:
value = command[2]
self.__server.setMaxRetry(name, int(value))
return self.__server.getMaxRetry(name)
elif command[1] == "maxlines":
value = command[2]
self.__server.setMaxLines(name, int(value))
return self.__server.getMaxLines(name)
# command
elif command[1] == "bantime":
value = command[2]
@ -245,6 +249,8 @@ class Transmitter:
return self.__server.getFindTime(name)
elif command[1] == "maxretry":
return self.__server.getMaxRetry(name)
elif command[1] == "maxlines":
return self.__server.getMaxLines(name)
# Action
elif command[1] == "bantime":
return self.__server.getBanTime(name)

12
testcases/files/testcase-multiline.log
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@ -0,0 +1,12 @@
Aug 14 11:59:58 [sshd] Invalid user toto...
Aug 14 11:59:58 [sshd] from 212.41.96.185
Aug 14 11:59:58 [sshd] Invalid user toto...
Aug 14 11:59:58 [sshd] from 212.41.96.185
Aug 14 11:59:58 [sshd] Invalid user fuck...
Aug 14 11:59:58 [sshd] from 212.41.96.185
Aug 14 11:59:58 [sshd] Invalid user toto...
Aug 14 11:59:58 [sshd] from 212.41.96.185
Aug 14 11:59:58 [sshd] Invalid user fuck...
Aug 14 11:59:58 [sshd] from 212.41.96.185
Aug 14 11:59:58 [sshd] Invalid user fuck...
Aug 14 11:59:58 [sshd] from 212.41.96.185

15
testcases/filtertestcase.py
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@ -499,6 +499,7 @@ class GetFailures(unittest.TestCase):
FILENAME_03 = "testcases/files/testcase03.log"
FILENAME_04 = "testcases/files/testcase04.log"
FILENAME_USEDNS = "testcases/files/testcase-usedns.log"
FILENAME_MULTILINE = "testcases/files/testcase-multiline.log"
# so that they could be reused by other tests
FAILURES_01 = ('193.168.0.128', 3, 1124013599.0,
@ -604,6 +605,20 @@ class GetFailures(unittest.TestCase):
self.assertRaises(FailManagerEmpty, self.filter.failManager.toBan)
def testGetFailuresMultiLine(self):
output = ("212.41.96.185", 3, 1124013598.0)
self.filter.addLogPath(GetFailures.FILENAME_MULTILINE)
self.filter.addFailRegex("Invalid user .+\n.+ from <HOST>$")
self.filter.addIgnoreRegex("user fuck")
self.filter.setMaxLines(2)
self.filter.getFailures(GetFailures.FILENAME_MULTILINE)
_assert_correct_last_attempt(self, self.filter, output)
self.assertRaises(FailManagerEmpty, self.filter.failManager.toBan)
class DNSUtilsTests(unittest.TestCase):
def testUseDns(self):

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