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feat(rules): add priority field

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This commit is contained in:
Marc VILLAIN
2026-03-23 01:00:04 +01:00
parent fca7e2053f
commit cba741fd9d
5 changed files with 139 additions and 68 deletions
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src/authorization.sql
+56 -66
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@@ -6,11 +6,14 @@
-- Semantics (from Multi-OrBAC paper):
-- - Access is allowed if and only if:
-- 1. At least one applicable permission exists
-- 2. AND no applicable prohibition exists
-- - Prohibitions have precedence over permissions
-- - Contexts must be evaluated
-- 2. AND no applicable prohibition exists (or permission has strictly higher priority)
-- - Default deny (no permission = deny)
-- - Obligations and recommendations do NOT affect authorization
--
-- Priority resolution:
-- - Each rule has an optional integer priority (NULL = 0, lowest)
-- - When both a prohibition and a permission apply, the higher-priority rule wins
-- - Tie goes to prohibition (modality precedence from the paper)
CREATE OR REPLACE FUNCTION morbac.is_allowed_nocache(
p_user_id UUID,
@@ -23,112 +26,99 @@ LANGUAGE plpgsql
STABLE
AS $$
DECLARE
v_rule RECORD;
v_rule RECORD;
v_max_prohibition_priority INTEGER := NULL;
v_max_permission_priority INTEGER := NULL;
BEGIN
-- STEP 1: Check for prohibitions first (prohibition precedence)
-- If any applicable prohibition exists, deny immediately
-- Checks:
-- - Direct rules for (activity, view) combinations
-- - Activity hierarchy (senior activities imply junior)
-- - View hierarchy (senior views imply junior)
-- - Comprehensive roles (direct, delegated, derived, inherited)
-- - Temporal validity (if rule has time constraints)
-- STEP 1: Local prohibitions — find the highest-priority applicable one
FOR v_rule IN
SELECT r.context_id
SELECT r.context_id, COALESCE(r.priority, 0) AS prio
FROM morbac.rules r
WHERE r.org_id = p_org_id
AND r.modality = 'prohibition'
-- Match activity or any senior activity in hierarchy
AND r.activity IN (
SELECT activity FROM morbac.get_effective_activities(p_activity)
)
-- Match view or any senior view in hierarchy
AND r.view IN (
SELECT view FROM morbac.get_effective_views(p_view)
)
-- Match comprehensive roles (direct, delegated, derived, inherited)
AND r.role_id IN (
SELECT role_id FROM morbac.get_comprehensive_roles(p_user_id, p_org_id)
)
-- Check temporal validity
AND r.activity IN (SELECT activity FROM morbac.get_effective_activities(p_activity))
AND r.view IN (SELECT view FROM morbac.get_effective_views(p_view))
AND r.role_id IN (SELECT role_id FROM morbac.get_comprehensive_roles(p_user_id, p_org_id))
AND morbac.is_rule_valid(r.valid_from, r.valid_until)
ORDER BY COALESCE(r.priority, 0) DESC
LOOP
-- Evaluate context
IF morbac.eval_context(v_rule.context_id) THEN
-- Prohibition found - immediate deny (prohibition precedence)
RETURN FALSE;
v_max_prohibition_priority := v_rule.prio;
EXIT; -- Highest-priority prohibition found; lower ones can't change the outcome
END IF;
END LOOP;
-- STEP 2: Check cross-organizational prohibitions
-- STEP 2: Cross-org prohibitions — update max if a higher priority is found
FOR v_rule IN
SELECT cr.context_id
SELECT cr.context_id, COALESCE(cr.priority, 0) AS prio
FROM morbac.cross_org_rules cr
WHERE cr.target_org_id = p_org_id
AND cr.modality = 'prohibition'
AND cr.activity IN (SELECT activity FROM morbac.get_effective_activities(p_activity))
AND cr.view IN (SELECT view FROM morbac.get_effective_views(p_view))
-- User has role in source org
AND cr.role_id IN (
SELECT role_id FROM morbac.get_comprehensive_roles(p_user_id, cr.source_org_id)
)
-- Check temporal validity
AND cr.view IN (SELECT view FROM morbac.get_effective_views(p_view))
AND cr.role_id IN (SELECT role_id FROM morbac.get_comprehensive_roles(p_user_id, cr.source_org_id))
AND morbac.is_rule_valid(cr.valid_from, cr.valid_until)
ORDER BY COALESCE(cr.priority, 0) DESC
LOOP
IF morbac.eval_context(v_rule.context_id) THEN
RETURN FALSE;
IF v_max_prohibition_priority IS NULL OR v_rule.prio > v_max_prohibition_priority THEN
v_max_prohibition_priority := v_rule.prio;
END IF;
EXIT;
END IF;
END LOOP;
-- STEP 3: No prohibitions found, check for permissions
-- STEP 3: Local permissions — find the highest-priority applicable one
FOR v_rule IN
SELECT r.context_id
SELECT r.context_id, COALESCE(r.priority, 0) AS prio
FROM morbac.rules r
WHERE r.org_id = p_org_id
AND r.modality = 'permission'
-- Match activity or any senior activity in hierarchy
AND r.activity IN (
SELECT activity FROM morbac.get_effective_activities(p_activity)
)
-- Match view or any senior view in hierarchy
AND r.view IN (
SELECT view FROM morbac.get_effective_views(p_view)
)
-- Match comprehensive roles
AND r.role_id IN (
SELECT role_id FROM morbac.get_comprehensive_roles(p_user_id, p_org_id)
)
-- Check temporal validity
AND r.activity IN (SELECT activity FROM morbac.get_effective_activities(p_activity))
AND r.view IN (SELECT view FROM morbac.get_effective_views(p_view))
AND r.role_id IN (SELECT role_id FROM morbac.get_comprehensive_roles(p_user_id, p_org_id))
AND morbac.is_rule_valid(r.valid_from, r.valid_until)
ORDER BY COALESCE(r.priority, 0) DESC
LOOP
-- Evaluate context
IF morbac.eval_context(v_rule.context_id) THEN
-- Permission found and no prohibition - allow
RETURN TRUE;
v_max_permission_priority := v_rule.prio;
EXIT;
END IF;
END LOOP;
-- STEP 4: Check cross-organizational permissions
-- STEP 4: Cross-org permissions — update max if higher found
FOR v_rule IN
SELECT cr.context_id
SELECT cr.context_id, COALESCE(cr.priority, 0) AS prio
FROM morbac.cross_org_rules cr
WHERE cr.target_org_id = p_org_id
AND cr.modality = 'permission'
AND cr.activity IN (SELECT activity FROM morbac.get_effective_activities(p_activity))
AND cr.view IN (SELECT view FROM morbac.get_effective_views(p_view))
AND cr.role_id IN (
SELECT role_id FROM morbac.get_comprehensive_roles(p_user_id, cr.source_org_id)
)
-- Check temporal validity
AND cr.view IN (SELECT view FROM morbac.get_effective_views(p_view))
AND cr.role_id IN (SELECT role_id FROM morbac.get_comprehensive_roles(p_user_id, cr.source_org_id))
AND morbac.is_rule_valid(cr.valid_from, cr.valid_until)
ORDER BY COALESCE(cr.priority, 0) DESC
LOOP
IF morbac.eval_context(v_rule.context_id) THEN
RETURN TRUE;
IF v_max_permission_priority IS NULL OR v_rule.prio > v_max_permission_priority THEN
v_max_permission_priority := v_rule.prio;
END IF;
EXIT;
END IF;
END LOOP;
-- No permission found - deny (default deny)
-- STEP 5: Priority resolution
-- No prohibition at all: allow if any permission was found
IF v_max_prohibition_priority IS NULL THEN
RETURN v_max_permission_priority IS NOT NULL;
END IF;
-- Prohibition exists: a permission with strictly higher priority overrides it
IF v_max_permission_priority IS NOT NULL
AND v_max_permission_priority > v_max_prohibition_priority THEN
RETURN TRUE;
END IF;
-- Prohibition wins (no permission, equal priority, or lower-priority permission)
RETURN FALSE;
END;
$$;