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66 lines
2.8 KiB
ReStructuredText
66 lines
2.8 KiB
ReStructuredText
===========================
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Validate Incoming Requests
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===========================
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Twilio requires that your TwiML-serving web server be open to the public. This is necessary so that Twilio can retrieve TwiML from urls and POST data back to your server.
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However, there may be people out there trying to spoof the Twilio service. Luckily, there's an easy way to validate that incoming requests are from Twilio and Twilio alone.
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An `indepth guide <http://www.twilio.com/docs/security>`_ to our security features can be found in our online documentation.
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Before you can validate requests, you'll need four pieces of information
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* your Twilio Auth Token
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* the POST data for the request
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* the requested URL
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* the X-Twilio-Signature header value
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Get your Auth Token from the `Twilio User Dashboard <https://www.twilio.com/user/account>`_.
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Obtaining the other three pieces of information depends on the framework of your choosing. I will assume that you have the POST data as an array and the url and X-Twilio-Signature as strings.
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The below example will print out a confirmation message if the request is actually from Twilio.com
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.. code-block:: php
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// Your auth token from twilio.com/user/account
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$authToken = '12345';
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// Download the twilio-php library from twilio.com/docs/php/install, include it
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// here
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require_once('/path/to/twilio-php/Services/Twilio.php');
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$validator = new Services_Twilio_RequestValidator($authToken);
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// The Twilio request URL. You may be able to retrieve this from
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// $_SERVER['SCRIPT_URI']
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$url = 'https://mycompany.com/myapp.php?foo=1&bar=2';
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// The post variables in the Twilio request. You may be able to use
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// $postVars = $_POST
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$postVars = array(
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'CallSid' => 'CA1234567890ABCDE',
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'Caller' => '+14158675309',
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'Digits' => '1234',
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'From' => '+14158675309',
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'To' => '+18005551212'
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);
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// The X-Twilio-Signature header - in PHP this should be
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// $_SERVER["HTTP_X_TWILIO_SIGNATURE"];
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$signature = 'RSOYDt4T1cUTdK1PDd93/VVr8B8=';
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if ($validator->validate($signature, $url, $postVars)) {
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echo "Confirmed to have come from Twilio.";
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} else {
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echo "NOT VALID. It might have been spoofed!";
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}
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Trailing Slashes
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==================
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If your URL uses an "index" page, such as index.php or index.html to handle the request, such as: https://mycompany.com/twilio where the real page is served from https://mycompany.com/twilio/index.php, then Apache or PHP may rewrite that URL a little bit so it's got a trailing slash... https://mycompany.com/twilio/ for example.
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Using the code above, or similar code in another language, you could end up with an incorrect hash because, Twilio built the hash using https://mycompany.com/twilio and you may have built the hash using https://mycompany.com/twilio/.
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