Generators for permissions(WIP)

First draft Custom Generators for permissions(WIP)

invenio_config_tugraz/__init__.py

@@ -9,6 +9,7 @@
 """invenio module that adds tugraz configs."""
 
 from .ext import invenioconfigtugraz
+from .generators import RecordIp
 from .version import __version__
 
-__all__ = ('__version__', 'invenioconfigtugraz')
+__all__ = ('__version__', 'invenioconfigtugraz', 'RecordIp')

invenio_config_tugraz/config.py

@@ -13,6 +13,20 @@ from flask_babelex import gettext as _
 INVENIO_CONFIG_TUGRAZ_SHIBBOLETH = True
 """Set True if SAML is configured"""
 
+INVENIO_CONFIG_TUGRAZ_SINGLE_IP = []
+"""Allows access to users whose IP address is listed.
+
+INVENIO_CONFIG_TUGRAZ_SINGLE_IP =
+    ["127.0.0.1", "127.0.0.2"]
+"""
+
+INVENIO_CONFIG_TUGRAZ_IP_RANGES = []
+"""Allows access to users whose range of IP address is listed.
+
+INVENIO_CONFIG_TUGRAZ_IP_RANGES =
+[["127.0.0.2", "127.0.0.99"], ["127.0.1.3", "127.0.1.5"]]
+"""
+
 # Invenio-App
 # ===========
 # See https://invenio-app.readthedocs.io/en/latest/configuration.html
@@ -66,8 +80,11 @@ SECURITY_EMAIL_SENDER = "info@invenio-test.tugraz.at"
 SECURITY_EMAIL_SUBJECT_REGISTER = _("Welcome to RDM!")
 """Email subject for account registration emails."""
 
-MAIL_SUPPRESS_SEND = False
+MAIL_SUPPRESS_SEND = True
-"""Enable email sending by default."""
+"""Enable email sending by default.
+
+Set this to False when sending actual emails.
+"""
 
 # CORS - Cross-origin resource sharing
 # ===========
@@ -163,3 +180,14 @@ to render your overriden login.html
 RECAPTCHA_PUBLIC_KEY = None
 #: Recaptcha private key (change to enable).
 RECAPTCHA_PRIVATE_KEY = None
+
+# invenio-records-permissions
+# =======
+# See:
+# https://invenio-records-permissions.readthedocs.io/en/latest/configuration.html
+#
+
+RECORDS_PERMISSIONS_RECORD_POLICY = (
+    'invenio_config_tugraz.permissions.TUGRAZPermissionPolicy'
+)
+"""Access control configuration for records."""

invenio_config_tugraz/generators.py

@@ -0,0 +1,214 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2020 Mojib Wali.
+#
+# invenio-config-tugraz is free software; you can redistribute it and/or
+# modify it under the terms of the MIT License; see LICENSE file for more
+# details.
+
+r"""Permission generators and policies for Invenio records.
+
+Invenio-records-permissions provides a means to fully customize access control
+for Invenio records. It does so by defining and providing three layers of
+permission constructs that build on each other:
+Generators and Policies. You can extend or override them for maximum
+control. Thankfully we provide default ones that cover most cases.
+
+Invenio-records-permissions conveniently structures (and relies on)
+functionalities from
+`invenio-access <https://invenio-access.readthedocs.io>`_ and
+`flask-principal <https://pythonhosted.org/Flask-Principal>`_ .
+
+
+Generators
+----------
+
+Generators are the lowest level of abstraction provided by
+invenio-records-permissions. A
+:py:class:`~invenio_records_permissions.generators.Generator` represents
+identities via
+`Needs <https://invenio-access.readthedocs.io/en/latest/api.html#needs>`_ that
+are allowed or disallowed to act on a kind of object. A Generator does not
+specify the action, but it does specify who is allowed and the kind of object
+of concern (typically records). Generators *generate* required and forbidden
+Needs at the object-of-concern level and *generate* query filters
+at the search-for-objects-of-concern level.
+
+A Generator object defines 3 methods in addition to its constructor:
+
+- ``needs(self, **kwargs)``: returns Needs, one of which a provider is
+                             required to have to be allowed
+- ``excludes(self, **kwargs)``: returns a list of Needs disallowing any
+                                provider of a single one
+- ``query_filter(self, **kwargs)``: returns a query filter to enable retrieval
+                                    of records
+
+The ``needs`` and ``excludes`` methods specify access conditions from
+the point-of-view of the object-of-concern; whereas, the ``query_filter``
+method specifies those from the actor's point-of-view in search scenarios.
+
+A simple example of a Generator is the provided
+:py:class:`~invenio_records_permissions.generators.RecordOwners` Generator:
+
+.. code-block:: python
+
+    from flask_principal import UserNeed
+
+
+    class RecordOwners(Generator):
+        '''Allows record owners.'''
+
+        def needs(self, record=None, **kwargs):
+            '''Enabling Needs.'''
+            return [UserNeed(owner) for owner in record.get('owners', [])]
+
+        def query_filter(self, record=None, **kwargs):
+            '''Filters for current identity as owner.'''
+            # NOTE: implementation subject to change until permissions metadata
+            #       settled
+            provides = g.identity.provides
+            for need in provides:
+                if need.method == 'id':
+                    return Q('term', owners=need.value)
+            return []
+
+``RecordOwners`` allows any identity providing a `UserNeed
+<https://pythonhosted.org/Flask-Principal/#flask_principal.UserNeed>`_
+of value found in the ``owners`` metadata of a record. The
+``query_filter(self, **kwargs)``
+method outputs a query that returns all owned records of the current user.
+Not included in the above, because it doesn't apply to ``RecordOwners``, is
+the ``excludes(self, **kwargs)`` method.
+
+.. Note::
+
+    Exclusion has priority over inclusion. If a Need is returned by both
+    ``needs`` and ``excludes``, providers of that Need will be **excluded**.
+
+If implementation of Generators seems daunting, fear not! A collection of
+them has already been implemented in
+:py:mod:`~invenio_records_permissions.generators`
+and they cover most cases you may have.
+
+To fully understand how they work, we have to show where Generators are used.
+That is in the Policies.
+
+
+Policies
+--------
+
+Classes inheriting from
+:py:class:`~invenio_records_permissions.policies.base.BasePermissionPolicy` are
+referred to as Policies. They list **what actions** can be done **by whom**
+over an implied category of objects (typically records). A Policy is
+instantiated on a per action basis and is a descendant of `Permission
+<https://invenio-access.readthedocs.io/en/latest/api.html
+#invenio_access.permissions.Permission>`_ in
+`invenio-access <https://invenio-access.readthedocs.io>`_ .
+Generators are used to provide the "by whom" part and the implied category of
+object.
+
+Here is an example of a custom record Policy:
+
+.. code-block:: python
+
+    from invenio_records_permissions.generators import AnyUser, RecordOwners, \
+        SuperUser
+    from invenio_records_permissions.policies.base import BasePermissionPolicy
+
+    class ExampleRecordPermissionPolicy(BasePermissionPolicy):
+        can_create = [AnyUser()]
+        can_search = [AnyUser()]
+        can_read = [AnyUser()]
+        can_update = [RecordOwners()]
+        can_foo_bar = [SuperUser()]
+
+The actions are class variables of the form: ``can_<action>`` and the
+corresponding (dis-)allowed identities are a list of Generator instances.
+One can define any action as long as it follows that pattern and
+is verified at the moment it is undertaken.
+
+In the example above, any user can create, list and read records, but only
+a record's owner can edit it and only super users can perform the "foo_bar"
+action.
+
+We recommend you extend the provided
+:py:class:`invenio_records_permissions.policies.records.RecordPermissionPolicy`
+to customize record permissions for your instance.
+This way you benefit from sane defaults.
+
+After you have defined your own Policy, set it in your configuration:
+
+.. code-block:: python
+
+    RECORDS_PERMISSIONS_RECORD_POLICY = (
+        'module.to.ExampleRecordPermissionPolicy'
+    )
+
+The succinct encoding of the permissions for your instance gives you
+    - one central location where your permissions are defined
+    - exact control
+    - great flexibility by defining your own actions, generators and policies
+"""
+
+from elasticsearch_dsl.query import Q
+from flask import current_app, request
+from invenio_records_permissions.generators import Generator
+
+
+class RecordIp(Generator):
+    """Allowed any user with accessing with the IP."""
+
+    # TODO: Implement
+    def needs(self, **kwargs):
+        """Enabling Needs, Set of Needs granting permission.
+
+        If ANY of the Needs are matched, permission is granted.
+
+        .. note::
+
+            ``_load_permissions()`` method from `Permission
+            <https://invenio-access.readthedocs.io/en/latest/api.html
+            #invenio_access.permissions.Permission>`_ adds by default the
+            ``superuser_access`` Need (if tied to a User or Role) for us.
+            It also expands ActionNeeds into the Users/Roles that
+            provide them.
+        """
+        return []
+
+    def excludes(self, **kwargs):
+        """Preventing Needs, Set of Needs denying permission.
+
+        If ANY of the Needs are matched, permission is revoked.
+
+        .. note::
+
+            ``_load_permissions()`` method from `Permission
+            <https://invenio-access.readthedocs.io/en/latest/api.html
+            #invenio_access.permissions.Permission>`_ adds by default the
+            ``superuser_access`` Need (if tied to a User or Role) for us.
+
+            It also expands ActionNeeds into the Users/Roles that
+            provide them.
+
+        If the same Need is returned by `needs` and `excludes`, then that
+        Need provider is disallowed.
+        """
+        return []
+
+    def query_filter(self, **kwargs):
+        """Elasticsearch filters, List of ElasticSearch query filters.
+
+        These filters consist of additive queries mapping to what the current
+        user should be able to retrieve via search.
+        """
+        return Q('match_all')
+
+    def check_permission(self):
+        """Check for User IP address in config variable."""
+        # Get user IP
+        user_ip = request.remote_addr
+        # Checks if the user IP is among single IPs
+        if user_ip in current_app.config['INVENIO_CONFIG_TUGRAZ_SINGLE_IP']:
+            return True
+        return False

invenio_config_tugraz/permissions.py

@@ -0,0 +1,84 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2020 Mojib Wali.
+#
+# invenio-config-tugraz is free software; you can redistribute it and/or
+# modify it under the terms of the MIT License; see LICENSE file for more
+# details.
+
+"""
+Records permission policies.
+
+Default policies for records:
+
+.. code-block:: python
+
+    # Read access given to everyone.
+    can_search = [AnyUser()]
+    # Create action given to no one (Not even superusers) bc Deposits should
+    # be used.
+    can_create = [Disable()]
+    # Read access given to everyone if public record/files and owners always.
+    can_read = [AnyUserIfPublic(), RecordOwners()]
+    # Update access given to record owners.
+    can_update = [RecordOwners()]
+    # Delete access given to admins only.
+    can_delete = [Admin()]
+    # Associated files permissions (which are really bucket permissions)
+    can_read_files = [AnyUserIfPublic(), RecordOwners()]
+    can_update_files = [RecordOwners()]
+
+How to override default policies for records.
+
+Using Custom Generator for a policy:
+
+.. code-block:: python
+
+    from invenio_rdm_records.permissions import RDMRecordPermissionPolicy
+    from invenio_config_tugraz.generators import RecordIp
+
+    class TUGRAZPermissionPolicy(RDMRecordPermissionPolicy):
+
+    # Delete access given to RecordIp only.
+
+    can_delete = [RecordIp()]
+
+    RECORDS_PERMISSIONS_RECORD_POLICY = TUGRAZPermissionPolicy
+
+
+Permissions for Invenio (RDM) Records.
+"""
+
+from invenio_records_permissions.generators import Admin, AnyUser, \
+    AnyUserIfPublic, Disable, RecordOwners
+from invenio_records_permissions.policies.base import BasePermissionPolicy
+
+from .generators import RecordIp
+
+
+class TUGRAZPermissionPolicy(BasePermissionPolicy):
+    """Access control configuration for records.
+
+    This overrides the /api/records endpoint.
+
+    """
+
+    # Read access to API given to everyone.
+    can_search = [AnyUser(), RecordIp()]
+
+    # Read access given to everyone if public record/files and owners always.
+    can_read = [AnyUserIfPublic(), RecordOwners(), RecordIp()]
+
+    # Create action given to no one (Not even superusers) bc Deposits should
+    # be used.
+    can_create = [AnyUser()]
+
+    # Update access given to record owners.
+    can_update = [RecordOwners()]
+
+    # Delete access given to admins only.
+    can_delete = [Admin()]
+
+    # Associated files permissions (which are really bucket permissions)
+    can_read_files = [AnyUserIfPublic(), RecordOwners()]
+    can_update_files = [RecordOwners()]

setup.py

@@ -37,6 +37,9 @@ setup_requires = [
 
 install_requires = [
     'Flask-BabelEx>=0.9.4',
+    'elasticsearch_dsl>=7.2.1',
+    'invenio-rdm-records~=0.18.3',
+    'invenio_search>=1.3.1',
 
 ]
 

tests/test_generators.py

@@ -0,0 +1,17 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2020 Mojib Wali.
+#
+# invenio-config-tugraz is free software; you can redistribute it and/or
+# modify it under the terms of the MIT License; see LICENSE file for more
+# details.
+
+from invenio_config_tugraz.generators import RecordIp
+
+
+def test_recordip():
+    generator = RecordIp()
+
+    assert generator.needs() == []
+    assert generator.excludes() == []
+    assert generator.query_filter().to_dict() == {'match_all': {}}