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authorWuKong <rebirthmonkey@gmail.com>2015-07-08 18:14:12 +0200
committerWuKong <rebirthmonkey@gmail.com>2015-07-08 18:14:12 +0200
commit8bb53c04f2cf12f1aa6dd2ae0af46cbfcd758265 (patch)
treeb8e578c1158da203bd9b9aedd5e58da533c5c37f /keystone-moon/keystone
parent88b61685332bb3b0dd65612bd5747064eccf68a8 (diff)
authz policy engine
Change-Id: I4edc67a09e1de000b0983d734bea21eb2655d74e Signed-off-by: WuKong <rebirthmonkey@gmail.com>
Diffstat (limited to 'keystone-moon/keystone')
-rw-r--r--keystone-moon/keystone/contrib/moon/algorithms.py64
-rw-r--r--keystone-moon/keystone/contrib/moon/core.py124
2 files changed, 132 insertions, 56 deletions
diff --git a/keystone-moon/keystone/contrib/moon/algorithms.py b/keystone-moon/keystone/contrib/moon/algorithms.py
new file mode 100644
index 00000000..bfdfc5ca
--- /dev/null
+++ b/keystone-moon/keystone/contrib/moon/algorithms.py
@@ -0,0 +1,64 @@
+import itertools
+
+""" an example of authz_buffer, sub_meta_rule_dict, rule_dict
+authz_buffer = {
+ 'subject_uuid': xxx,
+ 'object_uuid': yyy,
+ 'action_uuid': zzz,
+ 'subject_attributes': {
+ 'subject_category1': [],
+ 'subject_category2': [],
+ ...
+ 'subject_categoryn': []
+ },
+ 'object_attributes': {},
+ 'action_attributes': {},
+}
+
+sub_meta_rule_dict = {
+ "subject_categories": ["subject_security_level", "aaa"],
+ "action_categories": ["computing_action"],
+ "object_categories": ["object_security_level"],
+}
+
+rule_dict = [
+ ["high", "vm_admin", "medium"],
+ ["high", "vm_admin", "low"],
+ ["medium", "vm_admin", "low"],
+ ["high", "vm_access", "high"],
+ ["high", "vm_access", "medium"],
+ ["high", "vm_access", "low"],
+ ["medium", "vm_access", "medium"],
+ ["medium", "vm_access", "low"],
+ ["low", "vm_access", "low"]
+]
+"""
+
+def algo_inclusion(authz_buffer, sub_meta_rule_dict, rule_dict):
+ _cat = []
+ for subject_cat in sub_meta_rule_dict['subject_categories']:
+ if subject_cat in authz_buffer['subject_attributes']:
+ _cat.append(authz_buffer['subject_attributes'][subject_cat])
+ for action_cat in sub_meta_rule_dict['action_categories']:
+ if action_cat in authz_buffer['action_attributes']:
+ _cat.append(authz_buffer['action_attributes'][action_cat])
+ for object_cat in sub_meta_rule_dict['object_categories']:
+ if object_cat in authz_buffer['object_attributes']:
+ _cat.append(authz_buffer['object_attributes'][object_cat])
+
+ for _element in itertools.product(*_cat):
+ if list(_element) in rule_dict:
+ return True
+
+ return False
+
+
+def algo_comparison(_authz_buffer, _sub_meta_rule_dict, _rule_dict):
+ return
+
+
+def aggr_all_true(decision_buffer):
+ for _rule in decision_buffer:
+ if decision_buffer[_rule] is False:
+ return False
+ return True \ No newline at end of file
diff --git a/keystone-moon/keystone/contrib/moon/core.py b/keystone-moon/keystone/contrib/moon/core.py
index 56a491c9..ecbb6a90 100644
--- a/keystone-moon/keystone/contrib/moon/core.py
+++ b/keystone-moon/keystone/contrib/moon/core.py
@@ -20,6 +20,7 @@ from oslo_config import cfg
from keystone.i18n import _
from keystone.contrib.moon.exception import *
+from keystone.contrib.moon.algorithms import *
CONF = config.CONF
LOG = log.getLogger(__name__)
@@ -288,6 +289,56 @@ class IntraExtensionManager(manager.Manager):
driver = CONF.moon.intraextension_driver
super(IntraExtensionManager, self).__init__(driver)
+ def __get_authz_buffer(self, intra_extension_uuid, subject_uuid, object_uuid, action_uuid):
+ """
+ :param intra_extension_uuid:
+ :param subject_uuid:
+ :param object_uuid:
+ :param action_uuid:
+ :return: authz_buffer = {
+ 'subject_uuid': xxx,
+ 'object_uuid': yyy,
+ 'action_uuid': zzz,
+ 'subject_attributes': {
+ 'subject_category1': [],
+ 'subject_category2': [],
+ ...
+ 'subject_categoryn': []
+ },
+ 'object_attributes': {},
+ 'action_attributes': {},
+ }
+ """
+
+ if not self.driver.get_intra_extension(intra_extension_uuid):
+ raise IntraExtensionNotFound()
+
+ _authz_buffer = dict()
+ _authz_buffer['subject_uuid'] = subject_uuid
+ _authz_buffer['object_uuid'] = object_uuid
+ _authz_buffer['action_uuid'] = action_uuid
+
+ try:
+ _meta_data_dict = self.driver.get_meta_data_dict(intra_extension_uuid)
+ _subject_assignment_dict = self.driver.get_subject_category_assignment_dict(intra_extension_uuid, subject_uuid)
+ _object_assignment_dict = self.driver.get_object_category_assignment_dict(intra_extension_uuid, object_uuid)
+ _action_assignment_dict = self.driver.get_action_category_assignment_dict(intra_extension_uuid, action_uuid)
+ except exception: # Execption for ItemUnknow, ItemCategoryAssignmentOutOfScope, ItemCategoryAssignmentUnknown
+ pass
+
+ _authz_buffer['subject_attributes'] = dict()
+ _authz_buffer['object_attributes'] = dict()
+ _authz_buffer['action_attributes'] = dict()
+
+ for _subject_category in _meta_data_dict['subject_categories']:
+ _authz_buffer['subject_attributes'][_subject_category] = _subject_assignment_dict[_subject_category]
+ for _object_category in _meta_data_dict['object_categories']:
+ _authz_buffer['object_attributes'][_object_category] = _object_assignment_dict[_object_category]
+ for _action_category in _meta_data_dict['action_categories']:
+ _authz_buffer['action_attributes'][_action_category] = _action_assignment_dict[_action_category]
+
+ return _authz_buffer
+
def authz(self, intra_extension_uuid, subject_uuid, object_uuid, action_uuid):
"""Check authorization for a particular action.
@@ -301,68 +352,29 @@ class IntraExtensionManager(manager.Manager):
SubjectUnknown
ObjectUnknown
ActionUnknown
- SubjectCategoryAssignmentOutOfScope
- ActionCategoryAssignmentOutOfScope
- ObjectCategoryAssignmentOutOfScope
SubjectCategoryAssignmentUnknown
ObjectCategoryAssignmentUnknown
ActionCategoryAssignmentUnknown
"""
- if not self.driver.get_intra_extension(intra_extension_uuid):
- raise IntraExtensionNotFound()
+
+ _authz_buffer = self.__get_authz_buffer(intra_extension_uuid, subject_uuid, object_uuid, action_uuid)
+ _decision_buffer = dict()
try:
- _subject_category_dict = self.driver.get_subject_category_dict(intra_extension_uuid)
- _object_category_dict = self.driver.get_object_category_dict(intra_extension_uuid)
- _action_category_dict = self.driver.get_action_category_dict(intra_extension_uuid)
- _subject_category_value_dict = self.driver.get_subject_category_value_dict(intra_extension_uuid, subject_uuid)
- _object_category_value_dict = self.driver.get_object_category_value_dict(intra_extension_uuid, object_uuid)
- _action_category_value_dict = self.driver.get_action_category_value_dict(intra_extension_uuid, action_uuid)
- _subject_assignment_dict = self.driver.get_subject_category_assignment_dict(intra_extension_uuid)
- _action_assignment_dict = self.driver.get_action_category_assignment_dict(intra_extension_uuid)
- _object_assignment_dict = self.driver.get_object_category_assignment_dict(intra_extension_uuid)
- _meta_rule = self.driver.get_meta_rule(intra_extension_uuid)
- _rules = self.driver.get_rules(intra_extension_uuid)
- # # TODO: algorithm to validate requests
- # return True
- # except exception: # TODO: exception.IntraExtension.NotAuthorized
- # pass
-
- # get all rules for intra_extension
- rules = self.driver.get_rules(intra_extension_uuid)
- # check if relation exists in rules
- relation_to_check = None
- relations = self.driver.get_sub_meta_rule_relations(intra_extension_uuid)
- for relation in rules:
- if relation in relations:
- # hypothesis: only one relation to check
- relation_to_check = relation
- break
- else:
- self.moonlog_api.authz("KO: No relation can be used {}".format(rules.keys()))
- return False
- for sub_rule in rules[relation_to_check]:
- for cat in sub_meta_rule[relation_to_check]["subject_categories"]:
- rule_scope = sub_rule.pop(0)
- if rule_scope in subject_assignments[cat][subject_uuid]:
- break
- else:
- continue
- for cat in sub_meta_rule[relation_to_check]["action_categories"]:
- rule_scope = sub_rule.pop(0)
- if rule_scope in action_assignments[cat][action_uuid]:
- break
- else:
- continue
- for cat in sub_meta_rule[relation_to_check]["object_categories"]:
- rule_scope = sub_rule.pop(0)
- if rule_scope in object_assignments[cat][object_uuid]:
- break
- else:
- continue
- self.moonlog_api.authz("OK ({} {},{},{})".format(intra_extension_uuid, subject_uuid, action_uuid, object_uuid))
- return True
- self.moonlog_api.authz("KO ({} {},{},{})".format(intra_extension_uuid, subject_uuid, action_uuid, object_uuid))
+ _meta_rule_dict = self.driver.get_meta_rule_dict(intra_extension_uuid)
+ _rule_dict = self.driver.get_rule_dict(intra_extension_uuid)
+ except exception: # Execption for rule
+ pass
+
+ for _rule in _meta_rule_dict['sub_meta_rules']:
+ if _meta_rule_dict['sub_meta_rules'][_rule]['algorithm'] == 'inclusion':
+ _decision_buffer[_rule] = algo_inclusion(_authz_buffer, _meta_rule_dict['sub_meta_rules'][_rule], _rule_dict[_rule])
+ elif _meta_rule_dict['sub_meta_rules'][_rule]['algorithm'] == 'comparison':
+ _decision_buffer[_rule] = algo_comparison(_authz_buffer, _meta_rule_dict['sub_meta_rules'][_rule], _rule_dict[_rule])
+
+ if _meta_rule_dict['aggregation'] == 'all_true':
+ return aggr_all_true(_decision_buffer)
+
return False
def __get_key_from_value(self, value, values_dict):