Checks is website is safe against iframing and clickjacking attack
npm install -g iframeable iframeable <url> // example iframeable http://github.com http://github.com denies being iframed, safe
This utility checks if website responds with x-frame-options. Values DENY and SAMEORIGIN are safe, ALLOW-FROM generates a warning. If this header is not set at all, an error message is displayed and utility exits with code -1.
Think of iframeable as
curl -I <url> but with explanation about a specific option.
More information about clickjacking attack can be found at owasp.org. In a nutshell: the attacker creates a website with domain name similar to a good website, for example fake http://bank-mobile.com to lure http://bank.com`s customers. The attacker then iframes the entire http://bank.com website (100% width, 100% height), but overlays his own input fields, stealing usernames and passwords, for example.
Typical safe move: unless you have very good reason, do not allow iframing your website. All major browsers respect x-frame-options header. Just set it to DENY and the attacker will not have an easy way in.
Author: Gleb Bahmutov © 2014
License: MIT - do anything with the code, but don't blame me if it does not work.
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Copyright (c) 2014 Gleb Bahmutov
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.