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- Added comprehensive config/mcp.php with environment variable mapping. - Updated .env.example with MCP_* variables. - Added boot-time validation for security-critical configuration in src/Mcp/Boot.php. - Added $this->publishes() for the config file in Boot.php. - Updated README.md and CLAUDE.md with configuration and security documentation.
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Summary of ChangesHello @Snider, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request significantly enhances the security and operational robustness of the MCP package. It introduces a structured and centralized configuration system, ensuring all relevant settings are clearly documented and easily managed via environment variables. Crucially, it adds boot-time validation to identify and warn against potentially insecure configurations in production environments, thereby reducing security risks and improving overall system stability. Highlights
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Code Review
This pull request introduces a structured configuration system for the MCP package, along with boot-time validation and updated documentation. While these changes improve security and operability, a critical vulnerability was identified: the configured SQL whitelist and blocked tables restrictions are not enforced by the query execution logic. This creates a false sense of security and could expose sensitive data. Addressing these implementation gaps is essential. Additionally, there are suggestions to improve the robustness of configuration loading, refine command detection logic in the validation script, enhance code readability, and clarify a minor inconsistency in the README documentation.
| if (! config('mcp.database.use_whitelist', true)) { | ||
| \Illuminate\Support\Facades\Log::notice( | ||
| 'MCP: SQL whitelist validation is disabled. This reduces the protection against unauthorized queries.' | ||
| ); | ||
| } | ||
| } |
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A critical vulnerability exists here: the boot-time validation check implies that enabling mcp.database.use_whitelist provides protection against unauthorized SQL queries. However, the SqlQueryValidator service is not registered in the service provider and is not utilized by the QueryExecutionService. Consequently, no SQL validation is performed even when the whitelist is enabled, creating a false sense of security and leaving the system vulnerable to SQL injection and unauthorized data access. To fix this: 1. Register the SqlQueryValidator in the register() method of this class. 2. Ensure that QueryExecutionService utilizes the validator to check all queries before execution when the whitelist is enabled.
| 'blocked_tables' => [ | ||
| 'users', | ||
| 'api_keys', | ||
| 'failed_jobs', | ||
| 'migrations', | ||
| 'password_reset_tokens', | ||
| 'personal_access_tokens', | ||
| 'sessions', | ||
| ], |
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The blocked_tables configuration is introduced here to prevent access to sensitive database tables (e.g., users, api_keys). However, the current implementation of SqlQueryValidator and QueryExecutionService does not include any logic to enforce this restriction. Without an implementation that checks queries against this list, these sensitive tables remain accessible to database query tools, rendering this security control ineffective.
Recommendation: Update the SqlQueryValidator to accept the blocked_tables configuration and implement a check to ensure that no table in the list is accessed by the query.
| Example `config/mcp.php`: | ||
| ```php | ||
| return [ | ||
| 'database' => [ | ||
| 'connection' => 'readonly', // Dedicated read-only connection | ||
| 'connection' => env('MCP_DATABASE_CONNECTION'), | ||
| 'use_whitelist' => true, | ||
| 'blocked_tables' => ['users', 'api_keys'], | ||
| 'blocked_tables' => ['users', 'api_keys', 'sessions'], | ||
| ], | ||
| 'analytics' => [ | ||
| 'enabled' => true, | ||
| 'retention_days' => 90, | ||
| ], | ||
| 'quota' => [ | ||
| 'enabled' => true, | ||
| 'default_limit' => 1000, // Per workspace per day | ||
| ], | ||
| ]; |
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The example config/mcp.php is quite minimal and differs from the actual config/mcp.php file in a few ways that could be confusing for users:
- The
blocked_tablesarray is much shorter than the one in the actual config file. It would be better to show the full default list to give a complete picture of the default security posture. - Most values are hardcoded (e.g.,
use_whitelist), while the actual config file uses theenv()helper extensively. Showing moreenv()usage would make the example more representative.
I suggest updating the example to be more aligned with the config/mcp.php file that is being added to avoid confusion.
| 'connection' => env('MCP_DATABASE_CONNECTION'), | ||
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||
| // Whether to enforce whitelist-based query validation | ||
| 'use_whitelist' => env('MCP_USE_WHITELIST', true), |
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Environment variables are always read as strings, which can lead to unexpected behavior when a boolean or integer is expected. For example, (bool) "false" evaluates to true in PHP.
It's safer to explicitly cast values from env().
- For boolean values, use
filter_var(env('...', true), FILTER_VALIDATE_BOOLEAN). - For integer values, use
(int) env('...', 5).
This should be applied to all boolean and integer configurations in this file to make the configuration loading more robust.
'use_whitelist' => filter_var(env('MCP_USE_WHITELIST', true), FILTER_VALIDATE_BOOLEAN),| $argv = $_SERVER['argv'] ?? []; | ||
| $isMcpCommand = false; | ||
| foreach ($argv as $arg) { | ||
| if (str_contains($arg, 'mcp:')) { | ||
| $isMcpCommand = true; | ||
| break; | ||
| } | ||
| } |
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The current logic to detect if an MCP command is running iterates through all command-line arguments and checks if any of them contain mcp:. This is a bit fragile and could lead to false positives if, for example, an option value for a non-MCP command contains that string (e.g., php artisan some:command --option=foo-mcp:bar).
A more robust approach would be to check if the command name itself (which is typically the first argument after artisan) starts with mcp:. Also, it's better to use Laravel's request helper instead of accessing $_SERVER directly.
$argv = request()->server('argv', []);
$isMcpCommand = false;
if (isset($argv[1]) && str_starts_with($argv[1], 'mcp:')) {
$isMcpCommand = true;
}- Added comprehensive config/mcp.php with environment variable mapping. - Updated .env.example with MCP_* variables. - Added boot-time validation for security-critical configuration in src/Mcp/Boot.php. - Added $this->publishes() for the config file in Boot.php. - Updated README.md and CLAUDE.md with configuration and security documentation. - Added host-uk/core and host-uk/core-php repositories to composer.json to fix CI.
- Added comprehensive config/mcp.php with environment variable mapping. - Updated .env.example with MCP_* variables. - Added boot-time validation for security-critical configuration in src/Mcp/Boot.php. - Added $this->publishes() for the config file in Boot.php. - Updated README.md and CLAUDE.md with configuration and security documentation. - Updated composer.json to use host-uk/core-php repository for dependency resolution.
- Added comprehensive config/mcp.php with environment variable mapping. - Updated .env.example with MCP_* variables. - Added boot-time validation for security-critical configuration in src/Mcp/Boot.php. - Added $this->publishes() for the config file in Boot.php. - Updated README.md and CLAUDE.md with configuration and security documentation. - Updated composer.json to use host-uk/core-php repository. - Restored missing dev dependencies (Pest, PHPUnit, PHPStan, Psalm, Pint) to composer.json to fix CI failures.
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This change improves the security and operability of the MCP package by providing a structured configuration system, documenting all relevant environment variables, and adding boot-time validation to warn about insecure configurations in production.
Key improvements:
config/mcp.phpwhich maps all MCP-related settings to environment variables..env.examplewith a complete list ofMCP_*variables and their defaults.validateConfig()insrc/Mcp/Boot.phpto check for security-critical settings (e.g., dedicated DB connection) and log warnings/errors if they are missing or insecure in production.php artisan vendor:publish --tag=mcp-config.README.mdandCLAUDE.md.Fixes #23
PR created automatically by Jules for task 1172062881386547126 started by @Snider