Replace role system with permissions-based DB roles

Develop ability to list permissions for existing roles

Create a model registry for RBAC-tracked models

Write the data migration logic for creating
  the preloaded role definitions

Write migration to migrate old Role into ObjectRole model

This loops over the old Role model, knowing it is unique
  on object and role_field

Most of the logic is concerned with identifying the
  needed permissions, and then corresponding role definition

As needed, object roles are created and users then teams
  are assigned

Write re-computation of cache logic for teams
  and then for object role permissions

Migrate new RBAC internals to ansible_base

Migrate tests to ansible_base

Implement solution for visible_roles

Expose URLs for DAB RBAC

awx/main/access.py

@@ -20,7 +20,9 @@ from rest_framework.exceptions import ParseError, PermissionDenied
 # Django OAuth Toolkit
 from awx.main.models.oauth import OAuth2Application, OAuth2AccessToken
 
+# django-ansible-base
 from ansible_base.lib.utils.validation import to_python_boolean
+from ansible_base.rbac.models import RoleEvaluation
 
 # AWX
 from awx.main.utils import (
@@ -72,8 +74,6 @@ from awx.main.models import (
     WorkflowJobTemplateNode,
     WorkflowApproval,
     WorkflowApprovalTemplate,
-    ROLE_SINGLETON_SYSTEM_ADMINISTRATOR,
-    ROLE_SINGLETON_SYSTEM_AUDITOR,
 )
 from awx.main.models.mixins import ResourceMixin
 
@@ -264,7 +264,7 @@ class BaseAccess(object):
         return self.can_change(obj, data)
 
     def can_delete(self, obj):
-        return self.user.is_superuser
+        return self.user.has_obj_perm(obj, 'delete')
 
     def can_copy(self, obj):
         return self.can_add({'reference_obj': obj})
@@ -651,9 +651,8 @@ class UserAccess(BaseAccess):
             qs = (
                 User.objects.filter(pk__in=Organization.accessible_objects(self.user, 'read_role').values('member_role__members'))
                 | User.objects.filter(pk=self.user.id)
-                | User.objects.filter(
-                    pk__in=Role.objects.filter(singleton_name__in=[ROLE_SINGLETON_SYSTEM_ADMINISTRATOR, ROLE_SINGLETON_SYSTEM_AUDITOR]).values('members')
-                )
+                | User.objects.filter(is_superuser=True)
+                | User.objects.filter(profile__is_system_auditor=True)
             ).distinct()
         return qs
 
@@ -711,6 +710,15 @@ class UserAccess(BaseAccess):
             if not allow_orphans:
                 # in these cases only superusers can modify orphan users
                 return False
+            if settings.ANSIBLE_BASE_ROLE_SYSTEM_ACTIVATED:
+                # Permission granted if the user has all permissions that the target user has
+                target_perms = set(
+                    RoleEvaluation.objects.filter(role__in=obj.has_roles.all()).values_list('object_id', 'content_type_id', 'codename').distinct()
+                )
+                user_perms = set(
+                    RoleEvaluation.objects.filter(role__in=self.user.has_roles.all()).values_list('object_id', 'content_type_id', 'codename').distinct()
+                )
+                return not (target_perms - user_perms)
             return not obj.roles.all().exclude(ancestors__in=self.user.roles.all()).exists()
         else:
             return self.is_all_org_admin(obj)
@@ -949,9 +957,6 @@ class InventoryAccess(BaseAccess):
     def can_update(self, obj):
         return self.user in obj.update_role
 
-    def can_delete(self, obj):
-        return self.can_admin(obj, None)
-
     def can_run_ad_hoc_commands(self, obj):
         return self.user in obj.adhoc_role
 
@@ -1405,8 +1410,12 @@ class ExecutionEnvironmentAccess(BaseAccess):
     def can_change(self, obj, data):
         if obj and obj.organization_id is None:
             raise PermissionDenied
-        if self.user not in obj.organization.execution_environment_admin_role:
-            raise PermissionDenied
+        if settings.ANSIBLE_BASE_ROLE_SYSTEM_ACTIVATED:
+            if not self.user.has_obj_perm(obj, 'change'):
+                raise PermissionDenied
+        else:
+            if self.user not in obj.organization.execution_environment_admin_role:
+                raise PermissionDenied
         if data and 'organization' in data:
             new_org = get_object_from_data('organization', Organization, data, obj=obj)
             if not new_org or self.user not in new_org.execution_environment_admin_role:
@@ -1796,7 +1805,15 @@ class JobAccess(BaseAccess):
                     return True
 
         # Standard permissions model without job template involved
-        if obj.organization and self.user in obj.organization.execute_role:
+        # NOTE: this is the best we can do without caching way more permissions
+        from django.contrib.contenttypes.models import ContentType
+
+        filter_kwargs = dict(
+            content_type_id=ContentType.objects.get_for_model(Organization),
+            object_id=obj.organization_id,
+            role_definition__permissions__codename='execute_jobtemplate',
+        )
+        if self.user.has_roles.filter(**filter_kwargs).exists():
             return True
         elif not (obj.job_template or obj.organization):
             raise PermissionDenied(_('Job has been orphaned from its job template and organization.'))
@@ -2592,6 +2609,8 @@ class ScheduleAccess(UnifiedCredentialsMixin, BaseAccess):
         if not JobLaunchConfigAccess(self.user).can_add(data):
             return False
         if not data:
+            if settings.ANSIBLE_BASE_ROLE_SYSTEM_ACTIVATED:
+                return self.user.has_roles.filter(permission_partials__codename__in=['execute_jobtemplate', 'update_project', 'update_inventory']).exists()
             return Role.objects.filter(role_field__in=['update_role', 'execute_role'], ancestors__in=self.user.roles.all()).exists()
 
         return self.check_related('unified_job_template', UnifiedJobTemplate, data, role_field='execute_role', mandatory=True)
@@ -2620,6 +2639,8 @@ class NotificationTemplateAccess(BaseAccess):
     prefetch_related = ('created_by', 'modified_by', 'organization')
 
     def filtered_queryset(self):
+        if settings.ANSIBLE_BASE_ROLE_SYSTEM_ACTIVATED:
+            return self.model.access_qs(self.user, 'view')
         return self.model.objects.filter(
             Q(organization__in=Organization.accessible_objects(self.user, 'notification_admin_role')) | Q(organization__in=self.user.auditor_of_organizations)
         ).distinct()
@@ -2788,7 +2809,7 @@ class ActivityStreamAccess(BaseAccess):
                 | Q(notification_template__organization__in=auditing_orgs)
                 | Q(notification__notification_template__organization__in=auditing_orgs)
                 | Q(label__organization__in=auditing_orgs)
-                | Q(role__in=Role.objects.filter(ancestors__in=self.user.roles.all()) if auditing_orgs else [])
+                | Q(role__in=Role.visible_roles(self.user) if auditing_orgs else [])
             )
 
         project_set = Project.accessible_pk_qs(self.user, 'read_role')
@@ -2845,13 +2866,10 @@ class RoleAccess(BaseAccess):
 
     def filtered_queryset(self):
         result = Role.visible_roles(self.user)
-        # Sanity check: is the requesting user an orphaned non-admin/auditor?
-        # if yes, make system admin/auditor mandatorily visible.
-        if not self.user.is_superuser and not self.user.is_system_auditor and not self.user.organizations.exists():
-            mandatories = ('system_administrator', 'system_auditor')
-            super_qs = Role.objects.filter(singleton_name__in=mandatories)
-            result = result | super_qs
-        return result
+        # Make system admin/auditor mandatorily visible.
+        mandatories = ('system_administrator', 'system_auditor')
+        super_qs = Role.objects.filter(singleton_name__in=mandatories)
+        return result | super_qs
 
     def can_add(self, obj, data):
         # Unsupported for now