morbac_pg

Multi-Organization Based Access Control for PostgreSQL

A PostgreSQL extension implementing the Multi-OrBAC access control model - enabling organization-centric, context-aware, and hierarchical access control with advanced features like delegation, separation of duty, and cross-organizational policies.

Features

• Multi-organization with organizational hierarchy
• Role-based access with full hierarchy support
• Activity and view hierarchies with transitive permission inheritance
• Prohibition precedence over permissions
• Temporal delegation with time bounds
• Separation of duty constraints
• Derived roles computed from application logic
• Cross-organizational policies
• Context-aware rules
• Row-level security integration

Prerequisites

• PostgreSQL 12 or higher
• pgcrypto extension (included with PostgreSQL)

Quick Install

# Clone repository
git clone https://github.com/yourusername/morbac_pg.git
cd morbac_pg

# Install extension
sudo make install

# Enable in your database
psql -d mydb -c "CREATE EXTENSION morbac_pg;"

Manual Install

# Copy files to PostgreSQL extension directory
sudo cp morbac_pg.control $(pg_config --sharedir)/extension/
sudo cp morbac_pg--1.0.sql $(pg_config --sharedir)/extension/

# Enable in PostgreSQL
psql -d mydb -c "CREATE EXTENSION morbac_pg;"

Quick Start

-- 1. Create organization
INSERT INTO morbac.orgs (name) VALUES ('Acme Corp');

-- 2. Create role
INSERT INTO morbac.roles (org_id, name)
SELECT id, 'employee' FROM morbac.orgs WHERE name = 'Acme Corp';

-- 3. Assign user to role
INSERT INTO morbac.user_roles (user_id, role_id, org_id)
SELECT
    '00000000-0000-0000-0000-000000000001'::uuid,
    r.id,
    o.id
FROM morbac.orgs o
JOIN morbac.roles r ON r.org_id = o.id
WHERE o.name = 'Acme Corp' AND r.name = 'employee';

-- 4. Define policy
INSERT INTO morbac.policy (org_name, role_name, activity, view, modality)
VALUES ('Acme Corp', 'employee', 'read', 'documents', 'permission');

-- 5. Compile policy
SELECT * FROM morbac.compile_policy();

-- 6. Check authorization
SELECT morbac.is_allowed(
    '00000000-0000-0000-0000-000000000001'::uuid,
    (SELECT id FROM morbac.orgs WHERE name = 'Acme Corp'),
    'read',
    'documents'
); -- Returns: true

Usage

Authorization Check

SELECT morbac.is_allowed(user_id, org_id, activity, view);

Row-Level Security (RLS)

-- Enable RLS on your table
ALTER TABLE app.documents ENABLE ROW LEVEL SECURITY;

-- Create policy using Multi-OrBAC
CREATE POLICY doc_access ON app.documents
    FOR SELECT
    USING (morbac.rls_check('read', 'documents'));

Advanced Features

-- Delegation: Alice delegates role to Bob for 1 week
INSERT INTO morbac.delegations (delegator_user_id, delegate_user_id, role_id, org_id, valid_until)
VALUES (alice_id, bob_id, role_id, org_id, NOW() + INTERVAL '7 days');

-- Separation of Duty: Preparer and approver are mutually exclusive
INSERT INTO morbac.sod_conflicts (role1_id, role2_id, org_id)
VALUES (preparer_role_id, approver_role_id, org_id);

-- Cross-Org: Global auditor can access subsidiary
INSERT INTO morbac.cross_org_rules (source_org_id, target_org_id, role_id, activity, view, modality)
VALUES (global_org_id, subsidiary_org_id, auditor_role_id, 'read', 'reports', 'permission');

Testing

make test              # Run test suite in dedicated database
make test-db DB=mydb        # Run on existing database
make cleanup                # Remove test database

Documentation

• DOCUMENTATION.md - Architecture, API reference, integration guides
• ADMIN_GUIDE.md - Organization administrator setup and delegation
• test_morbac.sql - Test scenarios and examples
• CHANGELOG.md - Version history
• CONTRIBUTING.md - Contribution guidelines
• SECURITY.md - Security policy

Architecture

Authorization decision flow:

1. Collect all roles for user (direct, delegated, derived, hierarchy)
2. Filter out negative role assignments
3. Check for prohibitions - if found, deny access
4. Check for permissions - if found, allow access
5. Default deny

Prohibitions always override permissions.

Research

Based on the CNRS research paper: "Extending the OrBAC model to handle multi-organization environments"

This project is licensed under the MIT License - see the LICENSE file for details.

Contributing

See CONTRIBUTING.md for guidelines.

git clone https://github.com/yourusername/morbac_pg.git
cd morbac_pg
make install
make test

Support

• Read the documentation
• Report bugs via GitHub Issues
• Ask questions in Discussions
• Security issues: see SECURITY.md

Comparison with Traditional RBAC

Feature	Traditional RBAC	morbac_pg
Multi-tenancy	No	Yes
Prohibitions	No	Yes
Context-aware	No	Yes
Hierarchies	Basic roles only	Organizations, roles, activities, views
Delegation	No	Yes
Separation of Duty	No	Yes
Cross-organization	No	Yes