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validatesns's Introduction

validatesns

Validate integrity of Amazon SNS messages.

  • Verifies cryptographic signature.
  • Checks signing certificate is hosted on an Amazon-controlled URL.
  • Requires message be no older than one hour, the maximum lifetime of an SNS message.

CILink

Licence: MIT.

Quick start

$ pip install validatesns
import validatesns

# Raise validatesns.ValidationError if message is invalid.
validatesns.validate(decoded_json_message_from_sns)

Gotchas

The validate function downloads the signing certificate on every call. For performance reasons, it's worth caching certificates - you can do this by passing in a get_certificate function.

This takes a url, and returns the certificate content. Your function could cache to the filesystem, a database, or wherever makes sense.

Contribute

Github: https://github.com/nathforge/validatesns

validatesns's People

Contributors

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validatesns's Issues

Issue: Use SigningCertUrl instead of SigningCertURL

The response format has changed. There is no SigningCertURL

class SigningCertURLValidator(object):
    """
    Validate a message's SigningCertURL is in the expected format.
    """
    [..]

    def validate(self, message):
        if not isinstance(message, dict):
            raise ValidationError("Unexpected message type {!r}".format(type(message).__name__))

        url = message.get("SigningCertURL")
> obj['Sns'].keys()
dict_keys(['Type', 'MessageId', 'TopicArn', 'Subject', 'Message', 'Timestamp', 'SignatureVersion', 'Signature', 'SigningCertUrl', 'UnsubscribeUrl', 'MessageAttributes'])

> 'SigningCertUrl' in obj['Sns'].keys(), 'SigningCertURL' in obj['Sns'].keys()
(True, False)

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