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checkers.py
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checkers.py
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class BaseChecker(object):
"""Base class for checkers
In common case you want redefine in child only two attributes:
* `name` attribute
* `get_value` method
"""
key = None # key for Redis
key_template = '{rule}:{checker}:{value}:int' # template for key
settings = NotImplemented # Django settings
name = NotImplemented # checker name
def __init__(self, connection, request, rule_type, **kwargs):
self.connection = connection # for get_attempts and incr
self.request = request # for logging
self.limit = self.get_limit(rule_type) # for check
self.key = self.get_key(request, rule_type, **kwargs) # for redis connection
def get_key(self, request, rule_type, **kwargs):
"""Generate key for Redis
"""
value = self.get_value(request, **kwargs)
if value is None:
return
return self.key_template.format(
rule=rule_type,
checker=self.name,
value=value
)
def get_value(self, request):
"""Get key parameter for Redis key.
IP-address, client id etc.
"""
raise NotImplementedError
def get_limit(self, rule_type):
"""Git limit from rule for current check
"""
if rule_type in self.settings.BRUTEFORCE_LIMITS:
rule = self.settings.BRUTEFORCE_LIMITS[rule_type]
else:
rule = self.settings.BRUTEFORCE_LIMITS['default']
return getattr(rule, self.name)
def incr(self):
"""Increment attempts count
"""
if not self.key:
return
if self.connection.exists(self.key):
self.connection.incr(self.key, 1)
else:
self.connection.set(self.key, 1)
self.connection.expire(self.key, self.settings.BRUTEFORCE_TIMELIMIT * 60)
def get_attempts(self):
"""Get current attempts count
"""
if not self.key:
return 0
data = self.connection.get(self.key)
if not data:
return 0
# drop expired keys
ttl = self.connection.ttl(self.key)
if ttl < 0:
self.connection.delete(self.key)
return 0
return int(data)
def log(self):
"""Log limit activation
"""
# TODO: add logging
pass
def get_error(self):
"""Generate error message
"""
key = 'BRUTEFORCE_ERROR_{}'.format(self.name)
template = getattr(self.settings, key, self.settings.BRUTEFORCE_ERROR)
return template.format(
name=self.name,
limit=self.limit,
timelimit=self.settings.BRUTEFORCE_TIMELIMIT,
)
def check(self):
"""Check. Just check.
Return True if all is fine, False otherwise.
"""
# if disabled
if not self.key:
return True
if not self.limit:
return True
# get attempts
count = self.get_attempts()
# if first activation
if count == self.limit:
self.log()
# compare with limit
return count < self.limit
@classmethod
def clear(cls, connection, rule='*', value='*'):
template = cls.key_template.format(
rule=rule,
checker=cls.name,
value=value
)
for key in connection.keys(template):
connection.delete(key)
class UserChecker(BaseChecker):
name = 'user'
def get_value(self, request, user=None, **kwargs):
if not user:
if not request:
return
if not getattr(request, 'user', None):
return
user = request.user
# user.is_authenticated is callable for old Django and bool for Django 2.0
is_auth = user.is_authenticated
if type(is_auth) is bool:
if not is_auth:
return
else:
if not is_auth():
return
return user.pk
class IPChecker(BaseChecker):
name = 'ip'
def get_value(self, request, **kwargs):
if not request:
return
return request.META['REMOTE_ADDR']
class CSRFChecker(BaseChecker):
name = 'csrf'
def get_value(self, request, **kwargs):
if not request:
return
return getattr(request.POST, self.settings.CSRF_COOKIE_NAME, None)
class FrequencyChecker(UserChecker):
name = 'freq'
def log(self):
pass
def incr(self):
if not self.key:
return
if not self.limit:
return
self.connection.set(self.key, 0)
self.connection.expire(self.key, self.limit)
def check(self):
if not self.key:
return True
if not self.limit:
return True
if not self.connection.exists(self.key):
return True
ttl = self.connection.ttl(self.key_freq)
if ttl >= 0:
return True
self.log()
return False