Web Auth MCP Server

An MCP (Model Context Protocol) server that handles HTTP requests with automatic browser-based authentication.

Features

• Execute HTTP requests through MCP tools

• Automatic detection of authentication requirements

• Browser-based authentication for OAuth flows and login forms

• Chrome password manager integration - automatically use saved passwords

• Automatic form filling and submission - streamlined login process

• Retry requests with captured authentication credentials

• Support for cookies, tokens, and session management

• Configurable browser profiles (system or temporary)

Related MCP server: MCP Fetch Page

Installation

Quick Install

./install.sh

Manual Install

# Create virtual environment
python3 -m venv venv
source venv/bin/activate

# Install dependencies
pip install -r requirements.txt

# Install package
pip install -e .

Usage

Running the MCP Server

Stdio Mode (Default)

# Activate virtual environment
source venv/bin/activate

# Run the server with stdio transport
web-auth-mcp

HTTP/SSE Mode

# Activate virtual environment
source venv/bin/activate

# Run the server with HTTP transport on default port 8080
web-auth-mcp-http

# Or specify custom host and port
web-auth-mcp --http 0.0.0.0 8080

# Access the server at: http://localhost:8080/sse

MCP Client Configuration

For Stdio Transport

Add to your MCP client configuration (e.g., Claude Desktop):

{
  "mcpServers": {
    "web-auth-mcp": {
      "command": "python",
      "args": ["-m", "web_auth_mcp.server"],
      "env": {
        "BROWSER_HEADLESS": "false",
        "BROWSER_TIMEOUT": "60"
      }
    }
  }
}

For HTTP/SSE Transport

Configure your MCP client to connect to the HTTP endpoint:

{
  "mcpServers": {
    "web-auth-mcp": {
      "url": "http://localhost:8080/sse",
      "env": {
        "BROWSER_HEADLESS": "false",
        "BROWSER_TIMEOUT": "60"
      }
    }
  }
}

Testing

# Run tests
pytest

# Run example
python example_usage.py

Configuration

Create a .env file with optional configuration:

# Browser configuration
BROWSER_HEADLESS=false
BROWSER_TIMEOUT=60
BROWSER_WINDOW_SIZE=1920x1080

# Chrome Password Manager (NEW!)
BROWSER_USE_DEFAULT_PROFILE=false
BROWSER_ENABLE_PASSWORD_MANAGER=true
BROWSER_AUTO_FILL_PASSWORDS=true

# Authentication configuration
AUTH_CACHE_TTL=3600
AUTH_RETRY_ATTEMPTS=3

# Authentication timing (fixes quick closing issue)
BROWSER_TIMEOUT=300
MANUAL_AUTH_TIMEOUT=180
AUTH_WAIT_TIME=10

# Logging configuration
LOG_LEVEL=INFO
SUPPRESS_MCP_WARNINGS=true

Chrome Password Manager Integration

The server now supports using Chrome's saved passwords for automatic authentication:

Quick Start

1. Enable password manager features:

   export BROWSER_ENABLE_PASSWORD_MANAGER=true
   export BROWSER_AUTO_FILL_PASSWORDS=true
   export BROWSER_HEADLESS=false

2. Choose profile mode:

   • System Profile (access to all saved passwords):

     export BROWSER_USE_DEFAULT_PROFILE=true

   • Temporary Profile (session-only passwords):

     export BROWSER_USE_DEFAULT_PROFILE=false

3. Test the functionality:

   python test_password_manager.py
   python example_password_manager.py

How It Works

1. Automatic Detection: Detects login forms on web pages

2. Chrome Autofill: Triggers Chrome's built-in password autofill

3. Form Submission: Automatically submits forms when credentials are found

4. Fallback: Manual interaction available if auto-fill fails

Supported Login Forms

• Standard HTML login forms

• Email/username + password combinations

• Common form field patterns and selectors

• Various submit button types

For detailed documentation, see CHROME_PASSWORD_MANAGER.md.

Troubleshooting

MCP Initialization Warnings

You may see warnings like:

WARNING - Failed to validate request: Received request before initialization was complete

This is normal MCP protocol behavior and doesn't affect functionality. These warnings occur during the client-server handshake when requests are received before initialization completes.

To suppress these warnings:

export SUPPRESS_MCP_WARNINGS=true
# or add to your .env file:
echo "SUPPRESS_MCP_WARNINGS=true" >> .env

The server will continue to function correctly regardless of these warnings.

Tools

http_request

Execute HTTP requests with automatic authentication handling.

Parameters:

• url (string): The URL to request

• method (string): HTTP method (GET, POST, PUT, DELETE, etc.)

• headers (object, optional): Request headers

• body (string, optional): Request body

• auth_required (boolean, optional): Force authentication flow

Returns:

• Response status, headers, and body

• Authentication details if authentication was performed

How It Works

1. HTTP Request: The server receives an HTTP request through the MCP tool

2. Authentication Detection: Checks if authentication is required by examining:

   • HTTP status codes (401, 403)

   • Redirect responses to login pages

   • Content indicators ("please log in", etc.)

   • WWW-Authenticate headers

3. Browser Authentication: If authentication is needed:

   • Opens a browser window (headless or visible)

   • Navigates to the URL requiring authentication

   • Waits for user to complete authentication

   • Extracts authentication data (cookies, tokens, headers)

4. Request Retry: Retries the original request with authentication data

5. Response: Returns the final response with authentication status

Supported Authentication Types

• OAuth 2.0 flows (Authorization Code, Implicit, etc.)

• Form-based login (username/password forms)

• Cookie-based sessions

• Token-based authentication (JWT, Bearer tokens)

• CSRF protection (automatic token extraction)

Browser Automation

The server uses Selenium WebDriver with Chrome to handle authentication:

• Supports both headless and visible browser modes

• Automatically detects authentication completion

• Extracts tokens from localStorage, sessionStorage, and cookies

• Handles CSRF tokens from meta tags

• Configurable timeouts and window sizes

Troubleshooting

Browser Issues

Browser doesn't open:

• Check that BROWSER_HEADLESS=false (default)

• Ensure Chrome is installed on your system

Browser opens but doesn't close:

• The server detects authentication completion automatically

• Wait for the success message: "✅ Authentication completed successfully!"

• If stuck, check that you've completed the login process fully

Authentication timeout:

• Increase timeout: BROWSER_TIMEOUT=120 (default: 60 seconds)

• Ensure you complete authentication within the timeout period

Common Solutions

# Force visible browser
export BROWSER_HEADLESS=false

# Increase timeout
export BROWSER_TIMEOUT=120

# Debug mode
export LOG_LEVEL=DEBUG