/usr/share/denyhosts/DenyHosts/prefs.py is in denyhosts 2.10-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import os
import re
from regex import PREFS_REGEX
from util import die, calculate_seconds
debug = logging.getLogger("prefs").debug
info = logging.getLogger("prefs").info
ENVIRON_REGEX = re.compile(r"""\$\[(?P<environ>[A-Z_]*)\]""")
class Prefs(dict):
def __getitem__(self, k):
return self.get(k)
def __init__(self, path=None, **kwargs):
super(Prefs, self).__init__(**kwargs)
# default values for some of the configurable items
self.__data = {'ADMIN_EMAIL': None,
'SUSPICIOUS_LOGIN_REPORT_ALLOWED_HOSTS': 'yes',
'HOSTNAME_LOOKUP': 'yes',
'SYSLOG_REPORT': 'no',
'DAEMON_LOG': '/var/log/denyhosts',
'DAEMON_SLEEP': '30s',
'DAEMON_PURGE': '1h',
'DAEMON_LOG_TIME_FORMAT': None,
'DAEMON_LOG_MESSAGE_FORMAT': '%(asctime)s - %(name)-12s: %(levelname)-8s %(message)s',
'AGE_RESET_INVALID': None,
'AGE_RESET_VALID': None,
'AGE_RESET_ROOT': None,
'AGE_RESET_RESTRICTED': None,
'RESET_ON_SUCCESS': 'no',
'PLUGIN_DENY': None,
'PLUGIN_PURGE': None,
'IPTABLES': None,
'BLOCKPORT': None,
'PFCTL_PATH': None,
'PF_TABLE': None,
'SMTP_USERNAME': None,
'SMTP_PASSWORD': None,
'SMTP_DATE_FORMAT': "%a, %d %b %Y %H:%M:%S %z",
'SSHD_FORMAT_REGEX': None,
'FAILED_ENTRY_REGEX': None,
'FAILED_ENTRY_REGEX2': None,
'FAILED_ENTRY_REGEX3': None,
'FAILED_ENTRY_REGEX4': None,
'FAILED_ENTRY_REGEX5': None,
'FAILED_ENTRY_REGEX6': None,
'FAILED_ENTRY_REGEX7': None,
'FAILED_ENTRY_REGEX8': None,
# 'FAILED_ENTRY_REGEX9': None,
# 'FAILED_ENTRY_REGEX10': None,
'USERDEF_FAILED_ENTRY_REGEX': [],
'SUCCESSFUL_ENTRY_REGEX': None,
'SYNC_INTERVAL': '1h',
'SYNC_SERVER': None,
'SYNC_UPLOAD': "yes",
'SYNC_DOWNLOAD': "yes",
'SYNC_DOWNLOAD_THRESHOLD': 3,
'SYNC_DOWNLOAD_RESILIENCY': '5h',
'SYNC_PROXY_SERVER': None,
'PURGE_THRESHOLD': 0,
'ALLOWED_HOSTS_HOSTNAME_LOOKUP': 'no',
'ETC_DIR': '/etc'}
# reqd[0]: required field name
# reqd[1]: is value required? (False = value can be blank)
self.reqd = (('DENY_THRESHOLD_INVALID', True),
('DENY_THRESHOLD_VALID', True),
('DENY_THRESHOLD_ROOT', True),
('DENY_THRESHOLD_RESTRICTED', True),
('SECURE_LOG', True),
('LOCK_FILE', True),
('BLOCK_SERVICE', False),
('PURGE_DENY', False),
('HOSTS_DENY', True),
('WORK_DIR', True),
('ETC_DIR', False),
('IPTABLES', False),
('BLOCKPORT', False),
('PFCTL_PATH', False),
('PF_TABLE', False))
# the paths for these keys will be converted to
# absolute pathnames (in the event they are relative)
# since the --daemon mode requires absolute pathnames
self.make_abs = ('WORK_DIR',
'ETC_DIR',
'LOCK_FILE',
'SECURE_LOG',
'HOSTS_DENY',
'DAEMON_LOG',
'IPTABLES',
'PFCTL_PATH')
# these settings are converted to numeric values
self.to_int = set(('DENY_THRESHOLD',
'DENY_THRESHOLD_INVALID',
'DENY_THRESHOLD_VALID',
'DENY_THRESHOLD_ROOT',
'DENY_THRESHOLD_RESTRICTED',
'SYNC_DOWNLOAD_THRESHOLD',
'PURGE_THRESHOLD'))
# these settings are converted from timespec format
# to number of seconds (ie. "1m" -> 60)
self.to_seconds = set(('PURGE_DENY',
'DAEMON_PURGE',
'DAEMON_SLEEP',
'AGE_RESET_VALID',
'AGE_RESET_INVALID',
'AGE_RESET_RESTRICTED',
'SYNC_INTERVAL',
'SYNC_DOWNLOAD_RESILIENCY',
'AGE_RESET_ROOT'))
self.process_defaults()
if path: self.load_settings(path)
def process_defaults(self):
for name in self.to_seconds:
try:
self.__data[name] = calculate_seconds(self.__data[name])
except Exception:
pass
def load_settings(self, path):
try:
fp = open(path, "r")
except Exception, e :
die("Error reading file: %s" % path, e)
for line in fp:
line = line.strip()
if not line or line[0] in ('\n', '#'):
continue
try:
m = PREFS_REGEX.search(line)
if m:
name = m.group('name').upper()
value = self.environ_sub(m.group('value'))
#print name, value
if not value: value = None
if name in self.to_int:
value = int(value)
if name in self.to_seconds and value:
value = calculate_seconds(value)
if name == 'USERDEF_FAILED_ENTRY_REGEX':
self.__data['USERDEF_FAILED_ENTRY_REGEX'].append(re.compile(value))
else:
self.__data[name] = value
except Exception, e:
fp.close()
die("Error processing configuration parameter %s: %s" % (name, e))
fp.close()
self.check_required(path)
self.make_absolute()
def make_absolute(self):
for key in self.make_abs:
val = self.__data[key]
if val:
self.__data[key] = os.path.abspath(val)
def check_required(self, path):
ok = 1
for name_reqd, val_reqd in self.reqd:
if not self.__data.has_key(name_reqd):
print "Missing configuration parameter: %s" % name_reqd
if name_reqd == 'DENY_THRESHOLD_INVALID':
print "\nNote: The configuration parameter DENY_THRESHOLD has been renamed"
print " DENY_THRESHOLD_INVALID. Please update your DenyHosts configuration"
print " file to reflect this change."
if self.__data.has_key('DENY_THRESHOLD'):
print "\n*** Using deprecated DENY_THRESHOLD value for DENY_THRESHOLD_INVALID ***"
self.__data['DENY_THRESHOLD_INVALID'] = self.__data['DENY_THRESHOLD']
else:
ok = 0
elif name_reqd == 'DENY_THRESHOLD_RESTRICTED':
print "\nNote: DENY_THRESHOLD_RESTRICTED has not been defined. Setting this"
print "value to DENY_THRESHOLD_ROOT"
self.__data['DENY_THRESHOLD_RESTRICTED'] = self.__data['DENY_THRESHOLD_ROOT']
else:
ok = 0
elif val_reqd and not self.__data[name_reqd]:
print "Missing configuration value for: %s" % name_reqd
ok = 0
if not ok:
die("You must correct these problems found in: %s" % path)
def environ_sub(self, value):
while True:
environ_match = ENVIRON_REGEX.search(value)
if not environ_match: return value
name = environ_match.group("environ")
env = os.environ.get(name)
if not env:
die("Could not find environment variable: %s" % name)
value = ENVIRON_REGEX.sub(env, value)
def get(self, name):
return self.__data[name]
def dump(self):
print "Preferences:"
keys = self.__data.keys()
for key in keys:
if key == 'USERDEF_FAILED_ENTRY_REGEX':
for rx in self.__data[key]:
print " %s: [%s]" % (key, rx.pattern)
else:
print " %s: [%s]" % (key, self.__data[key])
def dump_to_logger(self):
keys = self.__data.keys()
keys.sort()
info("DenyHosts configuration settings:")
for key in keys:
if key == 'USERDEF_FAILED_ENTRY_REGEX':
for rx in self.__data[key]:
info(" %s: [%s]" % (key, rx.pattern))
else:
info(" %s: [%s]", key, self.__data[key])
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