Deal with signals and Securing your Server in cherryPy

Monitoring CherryPy App Activity with Librato

With the addition of CherryPy support, a simple and object-oriented web framework, we are happy to increase our capacity to watch over well-known Python web frameworks. With no changes to your application code, you can now quickly check the health and performance of your CherryPy online application, just like Django and Flask.

Please review our setup instructions if you are new to SolarWinds LibratoTM. If not, log in to your Librato account, create a CherryPy integration, and then adhere to the straightforward instructions to install our binding agent, set up your web application, and (re)launch it. You'll start to see metrics in your new CherryPy dashboard after a short while.

Features

• Over 80 indicators of the functionality and health of your CherryPy web application are reported by our instrumentation. With the help of the given configuration file, the reported metrics can be adjusted with ease.

• Average web response times that are both current and historical, with insight into model layer delay, WSGI application layer overhead, time spent contacting external services, and in the application code itself.
   
• A breakdown of the total throughput using HTTP status codes.

• Request error percentages.
   

• By instrumenting the default logging module, you can increase the volume of logs for critical, error, and warning messages (a variation in the log volume can often signal anomalous behaviour).

Deal with signals

Cherrypy.engine.signal handler is the automatic name for this engine plugin. However, only cherrypy.quickstart subscribes to it automatically (). So, if you're calling and you want signal handling:

tree.mount()
engine.start()
engine.block()

be sure to include the following before starting the engine:

engine.signals.subscribe()

Console Events in Windows

Some signals, such as Ctrl-C, are communicated using console events in Microsoft Windows. Python for Windows Extensions, which are installed automatically, are a need for CherryPy deployment on Windows platforms and are offered as an additional dependency with an environment marker. Once that is done, CherryPy will automatically handle Ctrl-C and other console events, including CTRL C EVENT, CTRL LOGOFF EVENT, CTRL BREAK EVENT, CTRL SHUTDOWN EVENT, and CTRL CLOSE EVENT, shutting down the bus in preparation for process exit.

Securing your server

This paragraph is not intended to serve as a comprehensive manual for safeguarding a web application or ecosystem. Please read through the various OWASP guides.

There are a number of parameters that can be enabled to increase the security of CherryPy sites. These consist of:

Communicating data:

• Implement secure cookies

Page renderings:

• HttpOnly cookies are set
   
• Configure XFrame settings

• Switch on XSS Protection

• Configure the content security policy.
   

Setting headers with a tool and wrapping your entire CherryPy programme in it is a simple approach to achieve this:

import cherrypy

#. If you are hooking something, set the priority by your needs.

# else on the hook point 'before finalise'.

@cherrypy.tools.register('before_finalize', priority=60)
def secureheaders():
    headers = cherrypy.response.headers
    headers['X-Frame-Options'] = 'DENY'
    headers['X-XSS-Protection'] = '1; mode=block'
    headers['Content-Security-Policy'] = "default-src 'self';"

You can set Strict Transport Security if you use SSL:

This should be added to secure headers():

If SSL is genuinely being used, only include Strict-Transport headers; refer to the IETF specification.

# "The STS header field in HTTP responses MUST NOT be included by a HSTS Host.

# sent via insecure transit" 

if (cherrypy.server.ssl_certificate != None and cherrypy.server.ssl_private_key != None):@    headers['Strict-Transport-Security'] = 'max-age=31536000'

# one year

The configuration file (or any other location where you want to enable the utility) should then contain:

tools.secureheaders.on is set to True.

You can additionally enable the following parameters if you utilise sessions:

tools.sessions.on = True
# Boost session security
tools.sessions.secure = True
tools.sessions.httponly = True

Frequently Asked Questions

What accomplishes CherryPy expose?

In other words, it is your responsibility as a developer to offer the tools necessary to implement the logic of your application after CherryPy has discovered and is called an exposed method. CherryPy believes that you, the developer, are the expert.

CherryPy, a server for the web?

In Brief CherryPy WSGI Web Server

Described as a fast, production-ready, thread-pooled, general HTTP server by the [CherryPy] team. Any Python WSGI web application can be served by this modular component.

Does CherryPy have several threads?

Application server with several threads. The multithreading idea served as the foundation for CherryPy's design. The multi-threaded environment is used each time a developer obtains or sets a value in the CherryPy namespace.

Describe the CherryPy framework.

The Python programming language is used by CherryPy, an object-oriented web application framework. By wrapping the HTTP protocol, it is intended to speed up the creation of web applications, although it remains low level and does not provide much more than what is specified in RFC 7231.

Describe Falcon API.

Falcon is a lightning-quick, lightweight Python web API framework for creating reliable app backends and microservices. The framework performs admirably with both gevent/meinheld and asyncio (ASGI) (WSGI).

Conclusion

We have talked about 

• Dealing with signals
• Windows Console Events
• Securing your server.

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Do upvote our blogs if you find them helpful and engaging!