burp-ui/docs/plugins.rst
2019-10-03 15:15:01 +02:00

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Plugins
=======
Since *v0.6.0*, you can write your own external plugins.
For now, *authentication*, *acl* and *audit* plugins are supported.
Authentication
--------------
You will find here a fully working example of an external *authentication*
plugin.
Please refer to the `Auth API <auth.html>`_ page for more details.
.. code-block:: python
:linenos:
from burpui.misc.auth import interface
__type__ = 'auth'
class UserHandler(interface.BUIhandler):
name = 'CUSTOM:AUTH'
priority = 1000
def __init__(self, app):
self.users = {
'toto': CustomUser('toto', 'toto'),
'tata': CustomUser('tata', 'tata'),
'titi': CustomUser('titi', 'titi'),
'tutu': CustomUser('tutu', 'tutu'),
}
def user(self, name):
return self.users.get(name, None)
@property
def loader(self):
return self
class CustomUser(interface.BUIuser):
def __init__(self, name, password):
self.name = self.id = name
self.password = password
def login(self, passwd):
self.authenticated = passwd == self.password
return self.authenticated
Line 1 is mandatory since you must implement the *auth* interface in order for
your plugin to work.
Line 3 ``__type__ = 'auth'`` defines a *auth* plugin.
Line 6 defines your *auth* backend name.
The rest of the code is just a minimal implementation of the *auth* interface.
This plugin defines four hardcoded users: *toto*, *tata*, *titi*, *tutu* with
respectively the same passwords as their username.
You can put this code in a file called *custom.py*, save this file in
*/etc/burp/plugins* for instance, and set ``plugins = /etc/burp/plugins``.
The plugin will be automatically loaded.
.. note:: This is just an example, do not run this particular plugin in production!
ACL
---
You will find here a fully working example of an external *acl* plugin.
Please refer to the `ACL API <acl.html>`_ page for more details.
.. code-block:: python
:linenos:
from burpui.misc.acl import interface
__type__ = 'acl'
class ACLloader(interface.BUIaclLoader):
name = 'CUSTOM:ACL'
priority = 1000
def __init__(self, app):
self.app = app
self.admin = 'toto'
self._acl = CustomACL(self)
@property
def acl(self):
return self._acl
@property
def grants(self):
return None
@property
def groups(self):
return None
def reload(self):
"""This method is used to reload the rules in case of config
change for instance"""
pass
class CustomACL(interface.BUIacl):
def __init__(self, loader):
self.loader = loader
def is_admin(self, username=None):
if not username:
return False
return username == self.loader.admin
def is_moderator(self, username=None):
if not username:
return False
return username == self.loader.admin
def is_client_rw(self, username=None, client=None, server=None):
if not username:
return False
return username == self.loader.admin
def is_client_allowed(self, username=None, client=None, server=None):
if not username:
return False
return username == self.loader.admin
def is_server_rw(self, username=None, server=None):
if not username:
return False
return username == self.loader.admin
def is_server_allowed(self, username=None, server=None):
if not username:
return False
return username == self.loader.admin
Line 1 is mandatory since you must implement the *acl* interface in order for
your plugin to work.
Line 3 ``__type__ = 'acl'`` defines a *acl* plugin.
Line 6 defines your *acl* backend name.
The rest of the code is just a minimal implementation of the *acl* interface.
This plugin defines a hardcoded admin user: *toto* which will be granted admin
rights through the whole application.
You can put this code in a file called *custom_acl.py*, save this file in
*/etc/burp/plugins* for instance, and set ``plugins = /etc/burp/plugins``.
The plugin will be automatically loaded.
.. note:: This is just an example, do not run this particular plugin in production!
ACL engine has built-in ``Groups`` support, to take full advantage of this
feature, it is recommended to use the ``meta_grants`` object as shown bellow:
.. note:: The grant syntax is explained in the `ACL <advanced_usage.html#acl>`__ documentation
.. code-block:: python
:linenos:
from burpui.misc.acl.meta import meta_grants
from burpui.misc.acl import interface
from six import iteritems
__type__ = 'acl'
class ACLloader(interface.BUIaclLoader):
name = 'CUSTOM2:ACL'
priority = 1001
_groups = {
'gp1': {
'grants': '["server1", "server2"]', # this needs to be a string
'members': ['user1'],
},
}
def __init__(self, app):
self.app = app
self.admin = 'toto'
self.init_rules()
self._acl = meta_grants
# We need to register our backend in order to be notified of
# configuration changes in other registered backends.
# This will then call our 'reload' function in order to re-apply
# our grants.
meta_grants.register_backend(self.name, self)
def init_rules(self):
for gname, content in iteritems(self._groups):
meta_grants.set_group(gname, content['members'])
meta_grants.set_grant(gname, content['grants'])
@property
def acl(self):
return self._acl
@property
def grants(self):
return self.acl.grants
@property
def groups(self):
return self._groups
def reload(self):
"""This method is used to reload the rules in case of config
change for instance"""
self.init_rules()
You can omit either the ``meta_grants.set_grant`` or the
``meta_grants.set_group`` part if you like. For instance to define the grants
of a given group using another ACL backend, and using your plugin to manage
groups membership only.
Audit
-----
# BUIaudit, BUIauditLogger as BUIauditLoggerInterface
You will find here a fully working example of an external *audit* plugin.
Please refer to the `Audit API <audit.html>`_ page for more details.
.. code-block:: python
:linenos:
from burpui.misc.audit import interface
import logging
__type__ = 'audit'
class BUIauditLoader(interface.BUIhandler):
name = 'CUSTOM:AUDIT'
priority = 1000
def __init__(self, app):
self.app = app
self.conf = app.conf
self.level = default = logging.getLevelName(self.app.logger.getEffectiveLevel())
if self.section in self.conf.options:
self.level = self.conf.safe_get(
'level',
section=self.section,
defaults=default
)
if self.level != default:
self.level = logging.getLevelName(f'{self.level}'.upper())
if not isinstance(self.level, int):
self.level = default
self._logger = BUIauditLogger(self)
class BUIauditLogger(interface.BUIauditLogger):
def __init__(self, loader):
self.loader = loader
self._level = self.loader.level
self.LOG_FORMAT = 'CUSTOM AUDIT LOG %(levelname)s in %(from)s: %(message)s'
def log(self, level, message, *args, **kwargs):
kwargs['levelname'] = level
kwargs['message'] = message % args if args else message
print(self.LOG_FORMAT % kwargs)
Line 1 is mandatory since you must implement the *audit* interface in order for
your plugin to work.
Line 5 ``__type__ = 'audit'`` defines a *auth* plugin.
Line 8 defines your *auth* backend name.
The rest of the code is just a minimal implementation of the *audit* interface.
You **must** define a ``self._logger`` object that implements the
``BUIauditLogger`` interface (see line 28).
In our example, the ``BUIauditLogger`` object is defined line 31.
This object **must** implement the ``log`` method. This is the method that will
be called when the *loglevel* matches your minimal log level.