/usr/lib/python3/dist-packages/preludecorrelator/main.py is in prelude-correlator 4.1.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 | # Copyright (C) 2009-2017 CS-SI. All Rights Reserved.
# Author: Yoann Vandoorselaere <yoann.v@prelude-ids.com>
#
# This file is part of the Prelude-Correlator program.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
import sys
import os
import time
import signal
import pkg_resources
import errno
from optparse import OptionParser, OptionGroup
from prelude import ClientEasy, checkVersion, IDMEFCriteria
from preludecorrelator import idmef, pluginmanager, context, log, config, require, error
logger = log.getLogger(__name__)
VERSION = pkg_resources.get_distribution('prelude-correlator').version
LIBPRELUDE_REQUIRED_VERSION = "1.2.6"
_DEFAULT_PROFILE = "prelude-correlator"
def _init_profile_dir(profile):
filename = require.get_data_filename("context.dat", profile=profile)
try:
os.makedirs(os.path.dirname(filename), mode=0o700)
except OSError as e:
if e.errno != errno.EEXIST:
raise
class Env:
def __init__(self, options):
self.prelude_client = None
log.initLogger(options)
self.config = config.Config(options.config)
self.profile = options.profile
self.pluginmanager = pluginmanager.PluginManager(self)
# restore previous context
# (this need to be called after logger is setup, and before plugin loading).
context.load(self.profile)
# Since we can launch different instances of prelude-correlator with different profiles,
# we need to separate their context and specific rules data files
# (this need to be called before plugin loading)
_init_profile_dir(self.profile)
self.pluginmanager.load()
logger.info("%d plugins have been loaded.", self.pluginmanager.getPluginCount())
class SignalHandler:
def __init__(self, env):
self._env = env
signal.signal(signal.SIGTERM, self._handle_signal)
signal.signal(signal.SIGINT, self._handle_signal)
signal.signal(signal.SIGQUIT, self._handle_signal)
def _handle_signal(self, signum, frame):
logger.info("caught signal %d", signum)
self._env.pluginmanager.signal(signum, frame)
if signum == signal.SIGQUIT:
context.stats()
self._env.pluginmanager.stats()
if self._env.prelude_client:
self._env.prelude_client.stats()
else:
self._env.prelude_client.stop()
class GenericReader(object):
def run(self):
pass
class ClientReader(GenericReader):
def __init__(self, prelude_client):
self.prelude_client = prelude_client
def run(self):
while True:
msg = idmef.IDMEF()
try:
ret = self.prelude_client.client.recvIDMEF(msg, 1000)
except Exception:
ret = None
if ret:
yield msg
else:
yield None
class FileReader(GenericReader):
def __init__(self, filename, offset=0, limit=-1):
self.filename = filename
self.offset = offset
self.limit = limit
def run(self):
count = 0
with open(self.filename, 'r') as input_file:
while self.limit == -1 or count < self.limit + self.offset:
msg = idmef.IDMEF()
try:
msg << input_file
except EOFError:
break
count += 1
if count >= self.offset:
yield msg
class PreludeClient(object):
def __init__(self, env, options, print_input=None, print_output=None, dry_run=False):
self._env = env
self._events_processed = 0
self._alert_generated = 0
self._print_input = print_input
self._print_output = print_output
self._continue = True
self._dry_run = dry_run
self._criteria = self._parse_criteria(self._env.config.get("general", "criteria"))
if not options.readfile:
self._receiver = ClientReader(self)
else:
self._receiver = FileReader(options.readfile, options.readoff, options.readlimit)
self.client = ClientEasy(
options.profile, ClientEasy.PERMISSION_IDMEF_READ|ClientEasy.PERMISSION_IDMEF_WRITE,
"Prelude Correlator", "Correlator", "CS-SI", VERSION)
self.client.setConfigFilename(options.config)
self.client.start()
def _handle_event(self, idmef):
if self._print_input:
self._print_input.write(str(idmef))
self._env.pluginmanager.run(idmef)
self._events_processed += 1
def stats(self):
logger.info("%d events received, %d correlationAlerts generated.", self._events_processed, self._alert_generated)
def correlationAlert(self, idmef):
self._alert_generated = self._alert_generated + 1
if not self._dry_run:
self.client.sendIDMEF(idmef)
if self._print_output:
self._print_output.write(str(idmef))
def run(self):
last = time.time()
for msg in self._receiver.run():
if msg and self._criteria.match(msg):
self._handle_event(msg)
now = time.time()
if now - last >= 1:
context.wakeup(now)
last = now
if not self._continue:
break
def stop(self):
self._continue = False
@staticmethod
def _parse_criteria(criteria):
if not criteria:
return IDMEFCriteria("alert")
criteria = "alert && (%s)" % (criteria)
try:
return IDMEFCriteria(criteria)
except Exception as e:
raise error.UserError("Invalid criteria provided '%s': %s" % (criteria, e))
def runCorrelator():
checkVersion(LIBPRELUDE_REQUIRED_VERSION)
config_filename = require.get_config_filename("prelude-correlator.conf")
parser = OptionParser(usage="%prog", version="%prog " + VERSION)
parser.add_option("-c", "--config", action="store", dest="config", type="string", help="Configuration file to use", metavar="FILE", default=config_filename)
parser.add_option("", "--dry-run", action="store_true", dest="dry_run", help="No report to the specified Manager will occur", default=False)
parser.add_option("-d", "--daemon", action="store_true", dest="daemon", help="Run in daemon mode")
parser.add_option("-P", "--pidfile", action="store", dest="pidfile", type="string", help="Write Prelude Correlator PID to specified file", metavar="FILE")
grp = OptionGroup(parser, "IDMEF Input", "Read IDMEF events from file")
grp.add_option("", "--input-file", action="store", dest="readfile", type="string", help="Read IDMEF events from the specified file", metavar="FILE")
grp.add_option("", "--input-offset", action="store", dest="readoff", type="int", help="Start processing events starting at the given offset", metavar="OFFSET", default=0)
grp.add_option("", "--input-limit", action="store", dest="readlimit", type="int", help="Read events until the given limit is reached", metavar="LIMIT", default=-1)
parser.add_option_group(grp)
grp = OptionGroup(parser, "Prelude", "Prelude generic options")
grp.add_option("", "--profile", dest="profile", type="string", help="Profile to use for this analyzer", default=_DEFAULT_PROFILE)
parser.add_option_group(grp)
parser.add_option("", "--print-input", action="store", dest="print_input", type="string", help="Dump alert input from manager to the specified file", metavar="FILE")
parser.add_option("", "--print-output", action="store", dest="print_output", type="string", help="Dump alert output to the specified file", metavar="FILE")
parser.add_option("-D", "--debug", action="store", dest="debug", type="int", default=0, help="Enable debugging output (level from 1 to 10)", metavar="LEVEL")
(options, args) = parser.parse_args()
env = Env(options)
SignalHandler(env)
ifd = None
if options.print_input:
if options.print_input == "-":
ifd = sys.stdout
else:
ifd = open(options.print_input, "w")
ofd = None
if options.print_output:
if options.print_output == "-":
ofd = sys.stdout
else:
ofd = open(options.print_output, "w")
if options.daemon:
if os.fork():
os._exit(0)
os.setsid()
if os.fork():
os._exit(0)
os.umask(0o77)
fd = os.open('/dev/null', os.O_RDWR)
for i in range(3):
os.dup2(fd, i)
os.close(fd)
if options.pidfile:
open(options.pidfile, "w").write(str(os.getpid()))
try:
env.prelude_client = PreludeClient(env, options, print_input=ifd, print_output=ofd)
except Exception as e:
raise error.UserError(e)
idmef.set_prelude_client(env.prelude_client)
env.prelude_client.run()
# save existing context
context.save(options.profile)
def main():
try:
runCorrelator()
except error.UserError as e:
logger.error("error caught while starting prelude-correlator : %s", e)
sys.exit(1)
except:
raise
|