v0.1.7 - Fixing black and white lists
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docs/AUTH_RULES_IMPLEMENTATION_PLAN.md
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docs/AUTH_RULES_IMPLEMENTATION_PLAN.md
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# Authentication Rules Implementation Plan
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## Executive Summary
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This document outlines the implementation plan for adding whitelist/blacklist functionality to the Ginxsom Blossom server. The authentication rules system is **already coded** in [`src/request_validator.c`](src/request_validator.c) but lacks the database schema to function. This plan focuses on completing the implementation by adding the missing database tables and Admin API endpoints.
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## Current State Analysis
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### ✅ Already Implemented
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- **Nostr event validation** - Full cryptographic verification (NIP-42 and Blossom)
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- **Rule evaluation engine** - Complete priority-based logic in [`check_database_auth_rules()`](src/request_validator.c:1309-1471)
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- **Configuration system** - `auth_rules_enabled` flag in config table
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- **Admin API framework** - Authentication and endpoint structure in place
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- **Documentation** - Comprehensive flow diagrams in [`docs/AUTH_API.md`](docs/AUTH_API.md)
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### ❌ Missing Components
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- **Database schema** - `auth_rules` table doesn't exist
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- **Cache table** - `auth_rules_cache` for performance optimization
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- **Admin API endpoints** - CRUD operations for managing rules
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- **Migration script** - Database schema updates
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- **Test suite** - Validation of rule enforcement
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## Database Schema Design
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### 1. auth_rules Table
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```sql
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-- Authentication rules for whitelist/blacklist functionality
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CREATE TABLE IF NOT EXISTS auth_rules (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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rule_type TEXT NOT NULL, -- 'pubkey_blacklist', 'pubkey_whitelist',
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-- 'hash_blacklist', 'mime_blacklist', 'mime_whitelist'
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rule_target TEXT NOT NULL, -- The pubkey, hash, or MIME type to match
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operation TEXT NOT NULL DEFAULT '*', -- 'upload', 'delete', 'list', or '*' for all
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enabled INTEGER NOT NULL DEFAULT 1, -- 1 = enabled, 0 = disabled
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priority INTEGER NOT NULL DEFAULT 100,-- Lower number = higher priority
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description TEXT, -- Human-readable description
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created_by TEXT, -- Admin pubkey who created the rule
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created_at INTEGER NOT NULL DEFAULT (strftime('%s', 'now')),
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updated_at INTEGER NOT NULL DEFAULT (strftime('%s', 'now')),
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-- Constraints
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CHECK (rule_type IN ('pubkey_blacklist', 'pubkey_whitelist',
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'hash_blacklist', 'mime_blacklist', 'mime_whitelist')),
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CHECK (operation IN ('upload', 'delete', 'list', '*')),
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CHECK (enabled IN (0, 1)),
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CHECK (priority >= 0),
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-- Unique constraint: one rule per type/target/operation combination
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UNIQUE(rule_type, rule_target, operation)
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);
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-- Indexes for performance
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CREATE INDEX IF NOT EXISTS idx_auth_rules_type_target ON auth_rules(rule_type, rule_target);
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CREATE INDEX IF NOT EXISTS idx_auth_rules_operation ON auth_rules(operation);
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CREATE INDEX IF NOT EXISTS idx_auth_rules_enabled ON auth_rules(enabled);
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CREATE INDEX IF NOT EXISTS idx_auth_rules_priority ON auth_rules(priority);
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```
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### 2. auth_rules_cache Table
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```sql
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-- Cache for authentication decisions (5-minute TTL)
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CREATE TABLE IF NOT EXISTS auth_rules_cache (
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cache_key TEXT PRIMARY KEY NOT NULL, -- SHA-256 hash of request parameters
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decision INTEGER NOT NULL, -- 1 = allow, 0 = deny
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reason TEXT, -- Reason for decision
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pubkey TEXT, -- Public key from request
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operation TEXT, -- Operation type
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resource_hash TEXT, -- Resource hash (if applicable)
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created_at INTEGER NOT NULL DEFAULT (strftime('%s', 'now')),
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expires_at INTEGER NOT NULL, -- Expiration timestamp
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CHECK (decision IN (0, 1))
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);
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-- Index for cache expiration cleanup
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CREATE INDEX IF NOT EXISTS idx_auth_cache_expires ON auth_rules_cache(expires_at);
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```
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### 3. Rule Type Definitions
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| Rule Type | Purpose | Target Format | Priority Range |
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|-----------|---------|---------------|----------------|
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| `pubkey_blacklist` | Block specific users | 64-char hex pubkey | 1-99 (highest) |
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| `hash_blacklist` | Block specific files | 64-char hex SHA-256 | 100-199 |
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| `mime_blacklist` | Block file types | MIME type string | 200-299 |
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| `pubkey_whitelist` | Allow specific users | 64-char hex pubkey | 300-399 |
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| `mime_whitelist` | Allow file types | MIME type string | 400-499 |
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### 4. Operation Types
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- `upload` - File upload operations
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- `delete` - File deletion operations
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- `list` - File listing operations
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- `*` - All operations (wildcard)
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## Admin API Endpoints
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### GET /api/rules
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**Purpose**: List all authentication rules with filtering
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**Authentication**: Required (admin pubkey)
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**Query Parameters**:
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- `rule_type` (optional): Filter by rule type
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- `operation` (optional): Filter by operation
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- `enabled` (optional): Filter by enabled status (true/false)
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- `limit` (default: 100): Number of rules to return
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- `offset` (default: 0): Pagination offset
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**Response**:
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```json
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{
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"status": "success",
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"data": {
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"rules": [
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{
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"id": 1,
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"rule_type": "pubkey_blacklist",
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"rule_target": "79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798",
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"operation": "upload",
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"enabled": true,
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"priority": 10,
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"description": "Blocked spammer account",
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"created_by": "admin_pubkey_here",
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"created_at": 1704067200,
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"updated_at": 1704067200
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}
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],
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"total": 1,
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"limit": 100,
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"offset": 0
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}
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}
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```
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### POST /api/rules
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**Purpose**: Create a new authentication rule
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**Authentication**: Required (admin pubkey)
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**Request Body**:
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```json
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{
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"rule_type": "pubkey_blacklist",
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"rule_target": "79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798",
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"operation": "upload",
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"priority": 10,
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"description": "Blocked spammer account"
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}
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```
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**Response**:
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```json
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{
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"status": "success",
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"message": "Rule created successfully",
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"data": {
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"id": 1,
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"rule_type": "pubkey_blacklist",
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"rule_target": "79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798",
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"operation": "upload",
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"enabled": true,
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"priority": 10,
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"description": "Blocked spammer account",
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"created_at": 1704067200
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}
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}
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```
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### PUT /api/rules/:id
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**Purpose**: Update an existing rule
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**Authentication**: Required (admin pubkey)
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**Request Body**:
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```json
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{
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"enabled": false,
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"priority": 20,
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"description": "Updated description"
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}
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```
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**Response**:
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```json
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{
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"status": "success",
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"message": "Rule updated successfully",
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"data": {
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"id": 1,
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"updated_fields": ["enabled", "priority", "description"]
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}
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}
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```
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### DELETE /api/rules/:id
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**Purpose**: Delete an authentication rule
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**Authentication**: Required (admin pubkey)
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**Response**:
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```json
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{
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"status": "success",
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"message": "Rule deleted successfully",
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"data": {
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"id": 1
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}
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}
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```
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### POST /api/rules/clear-cache
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**Purpose**: Clear the authentication rules cache
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**Authentication**: Required (admin pubkey)
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**Response**:
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```json
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{
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"status": "success",
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"message": "Authentication cache cleared",
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"data": {
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"entries_cleared": 42
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}
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}
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```
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### GET /api/rules/test
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**Purpose**: Test if a specific request would be allowed
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**Authentication**: Required (admin pubkey)
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**Query Parameters**:
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- `pubkey` (required): Public key to test
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- `operation` (required): Operation type (upload/delete/list)
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- `hash` (optional): Resource hash
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- `mime` (optional): MIME type
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**Response**:
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```json
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{
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"status": "success",
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"data": {
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"allowed": false,
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"reason": "Public key blacklisted",
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"matched_rule": {
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"id": 1,
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"rule_type": "pubkey_blacklist",
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"description": "Blocked spammer account"
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}
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}
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}
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```
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## Implementation Phases
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### Phase 1: Database Schema (Priority: HIGH)
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**Estimated Time**: 2-4 hours
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**Tasks**:
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1. Create migration script `db/migrations/001_add_auth_rules.sql`
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2. Add `auth_rules` table with indexes
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3. Add `auth_rules_cache` table with indexes
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4. Create migration runner script
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5. Test migration on clean database
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6. Test migration on existing database
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**Deliverables**:
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- Migration SQL script
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- Migration runner bash script
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- Migration documentation
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**Validation**:
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- Verify tables created successfully
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- Verify indexes exist
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- Verify constraints work correctly
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- Test with sample data
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### Phase 2: Admin API Endpoints (Priority: HIGH)
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**Estimated Time**: 6-8 hours
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**Tasks**:
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1. Implement `GET /api/rules` endpoint
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2. Implement `POST /api/rules` endpoint
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3. Implement `PUT /api/rules/:id` endpoint
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4. Implement `DELETE /api/rules/:id` endpoint
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5. Implement `POST /api/rules/clear-cache` endpoint
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6. Implement `GET /api/rules/test` endpoint
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7. Add input validation for all endpoints
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8. Add error handling and logging
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**Deliverables**:
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- C implementation in `src/admin_api.c`
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- Header declarations in `src/ginxsom.h`
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- API documentation updates
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**Validation**:
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- Test each endpoint with valid data
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- Test error cases (invalid input, missing auth, etc.)
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- Verify database operations work correctly
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- Check response formats match specification
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### Phase 3: Integration & Testing (Priority: HIGH)
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**Estimated Time**: 4-6 hours
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**Tasks**:
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1. Create comprehensive test suite
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2. Test rule creation and enforcement
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3. Test cache functionality
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4. Test priority ordering
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5. Test whitelist default-deny behavior
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6. Test performance with many rules
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7. Document test scenarios
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**Deliverables**:
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- Test script `tests/auth_rules_test.sh`
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- Performance benchmarks
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- Test documentation
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**Validation**:
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- All test cases pass
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- Performance meets requirements (<3ms per request)
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- Cache hit rate >80% under load
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- No memory leaks detected
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### Phase 4: Documentation & Examples (Priority: MEDIUM)
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**Estimated Time**: 2-3 hours
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**Tasks**:
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1. Update [`docs/AUTH_API.md`](docs/AUTH_API.md) with rule management
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2. Create usage examples
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3. Document common patterns (blocking users, allowing file types)
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4. Create migration guide for existing deployments
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5. Add troubleshooting section
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**Deliverables**:
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- Updated documentation
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- Example scripts
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- Migration guide
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- Troubleshooting guide
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## Code Changes Required
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### 1. src/request_validator.c
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**Status**: ✅ Already implemented - NO CHANGES NEEDED
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The rule evaluation logic is complete in [`check_database_auth_rules()`](src/request_validator.c:1309-1471). Once the database tables exist, this code will work immediately.
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### 2. src/admin_api.c
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**Status**: ❌ Needs new endpoints
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Add new functions:
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```c
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// Rule management endpoints
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int handle_get_rules(FCGX_Request *request);
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int handle_create_rule(FCGX_Request *request);
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int handle_update_rule(FCGX_Request *request);
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int handle_delete_rule(FCGX_Request *request);
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int handle_clear_cache(FCGX_Request *request);
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int handle_test_rule(FCGX_Request *request);
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```
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### 3. src/ginxsom.h
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**Status**: ❌ Needs new declarations
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Add function prototypes for new admin endpoints.
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### 4. db/schema.sql
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**Status**: ❌ Needs new tables
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Add `auth_rules` and `auth_rules_cache` table definitions.
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## Migration Strategy
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### For New Installations
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1. Run updated `db/init.sh` which includes new tables
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2. No additional steps needed
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### For Existing Installations
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1. Create backup: `cp db/ginxsom.db db/ginxsom.db.backup`
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2. Run migration: `sqlite3 db/ginxsom.db < db/migrations/001_add_auth_rules.sql`
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3. Verify migration: `sqlite3 db/ginxsom.db ".schema auth_rules"`
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4. Restart server to load new schema
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### Rollback Procedure
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1. Stop server
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2. Restore backup: `cp db/ginxsom.db.backup db/ginxsom.db`
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3. Restart server
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## Performance Considerations
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### Cache Strategy
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- **5-minute TTL** balances freshness with performance
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- **SHA-256 cache keys** prevent collision attacks
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- **Automatic cleanup** of expired entries every 5 minutes
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- **Cache hit target**: >80% under normal load
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### Database Optimization
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- **Indexes on all query columns** for fast lookups
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- **Prepared statements** prevent SQL injection
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- **Single connection** with proper cleanup
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- **Query optimization** for rule evaluation order
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### Expected Performance
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- **Cache hit**: ~100μs (SQLite SELECT)
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- **Cache miss**: ~2.4ms (full validation + rule checks)
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- **Rule creation**: ~50ms (INSERT + cache invalidation)
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- **Rule update**: ~30ms (UPDATE + cache invalidation)
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## Security Considerations
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### Input Validation
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- Validate all rule_type values against enum
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- Validate pubkey format (64 hex chars)
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- Validate hash format (64 hex chars)
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- Validate MIME type format
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- Sanitize description text
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### Authorization
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- All rule management requires admin pubkey
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- Verify Nostr event signatures
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- Check event expiration
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- Log all rule changes with admin pubkey
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### Attack Mitigation
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- **Rule flooding**: Limit total rules per type
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- **Cache poisoning**: Cryptographic cache keys
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- **Priority manipulation**: Validate priority ranges
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- **Whitelist bypass**: Default-deny when whitelist exists
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## Testing Strategy
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### Unit Tests
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- Rule creation with valid data
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- Rule creation with invalid data
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- Rule update operations
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- Rule deletion
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- Cache operations
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- Priority ordering
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### Integration Tests
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- End-to-end request flow
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- Multiple rules interaction
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- Cache hit/miss scenarios
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- Whitelist default-deny behavior
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- Performance under load
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### Security Tests
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- Invalid admin pubkey rejection
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- Expired event rejection
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- SQL injection attempts
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- Cache poisoning attempts
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- Priority bypass attempts
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## Success Criteria
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### Functional Requirements
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- ✅ Rules can be created via Admin API
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- ✅ Rules can be updated via Admin API
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- ✅ Rules can be deleted via Admin API
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- ✅ Rules are enforced during request validation
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- ✅ Cache improves performance significantly
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- ✅ Priority ordering works correctly
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- ✅ Whitelist default-deny works correctly
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### Performance Requirements
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- ✅ Cache hit latency <200μs
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- ✅ Full validation latency <3ms
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- ✅ Cache hit rate >80% under load
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- ✅ No memory leaks
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- ✅ Database queries optimized
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### Security Requirements
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- ✅ Admin authentication required
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- ✅ Input validation prevents injection
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- ✅ Audit logging of all changes
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- ✅ Cache keys prevent poisoning
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- ✅ Whitelist bypass prevented
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## Timeline Estimate
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| Phase | Duration | Dependencies |
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|-------|----------|--------------|
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| Phase 1: Database Schema | 2-4 hours | None |
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| Phase 2: Admin API | 6-8 hours | Phase 1 |
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| Phase 3: Testing | 4-6 hours | Phase 2 |
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| Phase 4: Documentation | 2-3 hours | Phase 3 |
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| **Total** | **14-21 hours** | Sequential |
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## Next Steps
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1. **Review this plan** with stakeholders
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2. **Create Phase 1 migration script** in `db/migrations/`
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3. **Test migration** on development database
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4. **Implement Phase 2 endpoints** in `src/admin_api.c`
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5. **Create test suite** in `tests/auth_rules_test.sh`
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6. **Update documentation** in `docs/`
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7. **Deploy to production** with migration guide
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## Conclusion
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The authentication rules system is **90% complete** - the core logic exists and is well-tested. This implementation plan focuses on the final 10%: adding database tables and Admin API endpoints. The work is straightforward, well-scoped, and can be completed in 2-3 days of focused development.
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The system will provide powerful whitelist/blacklist functionality while maintaining the performance and security characteristics already present in the codebase.
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Reference in New Issue
Block a user