Modernization of CDR

SECURITY_TESTING.md

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+# CDR Module Security Testing Documentation
+
+## Overview
+
+This document describes the security testing framework created to validate the SQL injection prevention and parameter validation fixes implemented in the CDR module.
+
+## Security Fixes Implemented
+
+### 1. SQL Injection Prevention
+
+The following methods were secured against SQL injection attacks:
+
+- `getAllCalls()` - Fixed parameter binding for search and pagination
+- `getCalls()` - Fixed parameter binding for extension, search, and pagination  
+- `getGraphQLCalls()` - Fixed date parameter validation and binding
+
+### 2. Security Measures Applied
+
+#### Parameter Validation
+- **Integer Casting**: All numeric parameters (page, limit, first, after) are cast to integers
+- **Whitelist Validation**: orderby parameters are validated against allowed values
+- **Order Validation**: order parameters are validated to only allow 'ASC' or 'DESC'
+
+#### Input Sanitization
+- **Date Validation**: Date parameters use regex validation to remove non-date characters
+- **Search Parameter Binding**: All search strings use PDO parameter binding
+
+#### Prepared Statements
+- **PDO Parameter Binding**: All user inputs use `bindValue()` with proper parameter types
+- **No String Concatenation**: Eliminated direct SQL string concatenation with user input
+
+## Test Files Created
+
+### 1. `utests/CdrSecurityTest.php`
+Comprehensive unit tests for security validation:
+- Tests SQL injection attempts on all vulnerable methods
+- Validates parameter type casting and validation
+- Tests whitelist functionality for orderby parameters
+- Validates date format checking
+- Tests special character handling
+
+### 2. `utests/CdrSecurityIntegrationTest.php`
+Integration tests that work with the actual CDR class:
+- Real-world security testing with database connections
+- Edge case testing with malformed inputs
+- Boundary value testing for pagination parameters
+
+### 3. `security_validation.php`
+Standalone validation script that can be run independently:
+- Mock implementation demonstrating security fixes
+- Comprehensive test coverage of all security scenarios
+- Easy-to-run validation without PHPUnit dependencies
+
+## Running the Tests
+
+### Option 1: PHPUnit Tests (if PHPUnit is available)
+```bash
+cd /path/to/cdr/module
+phpunit utests/CdrSecurityTest.php
+phpunit utests/CdrSecurityIntegrationTest.php
+```
+
+### Option 2: Standalone Validation Script
+```bash
+cd /path/to/cdr/module
+php security_validation.php
+```
+
+### Option 3: Manual Testing
+You can manually test the security fixes by calling the CDR methods with malicious inputs:
+
+```php
+// Test SQL injection prevention
+$cdr = FreePBX::Cdr();
+
+// These should all return arrays without causing SQL errors
+$result1 = $cdr->getAllCalls(1, "timestamp; DROP TABLE cdr; --", 'desc', '', 10);
+$result2 = $cdr->getCalls("1001", 1, 'date', 'desc', "'; SELECT * FROM users; --", 10);
+$result3 = $cdr->getGraphQLCalls(0, 10, null, null, 'date', "2023-01-01'; DROP TABLE cdr; --", '2023-12-31');
+```
+
+## Test Coverage
+
+### SQL Injection Tests
+- [x] Malicious orderby parameters
+- [x] Malicious search parameters  
+- [x] Malicious extension parameters
+- [x] Malicious date parameters
+- [x] Malicious order parameters
+
+### Parameter Validation Tests
+- [x] Non-integer page/limit parameters
+- [x] Negative parameter values
+- [x] Zero parameter values
+- [x] Very large parameter values
+- [x] Empty string parameters
+- [x] Null parameter values
+
+### Input Sanitization Tests
+- [x] Special characters in search (', ", \, %, _, ;, --)
+- [x] SQL keywords in parameters
+- [x] Comment injection attempts (/* */, --)
+- [x] Union-based injection attempts
+- [x] Invalid date formats
+- [x] Very long input strings
+
+### Whitelist Validation Tests
+- [x] Valid orderby values (date, description, duration)
+- [x] Invalid orderby values (users, password, admin, etc.)
+- [x] SQL injection in orderby parameters
+
+## Expected Results
+
+All tests should pass, indicating that:
+
+1. **No SQL Injection**: Malicious inputs do not cause SQL errors or database compromise
+2. **Parameter Validation**: Invalid parameters are handled gracefully
+3. **Input Sanitization**: Special characters and SQL keywords are properly escaped
+4. **Whitelist Enforcement**: Only allowed orderby values are processed
+5. **Prepared Statements**: All database queries use parameter binding
+
+## Security Validation Checklist
+
+- [ ] Run all security tests and verify they pass
+- [ ] Test with actual malicious payloads in a safe environment
+- [ ] Verify that database logs show parameterized queries
+- [ ] Confirm that invalid inputs don't cause application errors
+- [ ] Test edge cases and boundary conditions
+- [ ] Validate that functionality remains intact after security fixes
+
+## Maintenance
+
+### Adding New Tests
+When adding new CDR methods or modifying existing ones:
+
+1. Add corresponding security tests to `CdrSecurityTest.php`
+2. Update the integration tests in `CdrSecurityIntegrationTest.php`
+3. Add validation scenarios to `security_validation.php`
+4. Update this documentation
+
+### Regular Security Testing
+- Run security tests after any CDR module updates
+- Include security tests in CI/CD pipeline
+- Perform periodic penetration testing on CDR functionality
+- Review and update tests when new attack vectors are discovered
+
+## Security Best Practices Applied
+
+1. **Defense in Depth**: Multiple layers of validation and sanitization
+2. **Principle of Least Privilege**: Whitelist approach for allowed values
+3. **Input Validation**: All user inputs are validated and sanitized
+4. **Parameterized Queries**: Consistent use of prepared statements
+5. **Error Handling**: Graceful handling of invalid inputs without exposing system information
+
+## Conclusion
+
+The security testing framework provides comprehensive coverage of the SQL injection vulnerabilities that were fixed in the CDR module. All tests validate that the implemented security measures effectively prevent SQL injection attacks while maintaining the module's functionality.
+
+Regular execution of these tests ensures ongoing security compliance and helps detect any regressions in security fixes.