removed csrf check for instagram v2 #46
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augustinas
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Instagram was failing authorization, both for v1 and v2 APIs, with a Bad Signature error. After a thorough research
we identified that the problem lies in the
stateparameter and how Silhouette and Instagram form and parse it.Specifically the
stateparameter Silhouette is sending, not only to instagram but on all social providers, has thefollowing format: `1-signature-data==-HAT token== example:
[DEBUG] [2020-04-07 22:44:46] c.h.d.u.ImprovedJcaSigner - State parameter is 1-1dd74ac1125e19d8de39fa4afb7ad44ad8a9798c-Y3NyZi1zdGF0ZQ%3D%3D-eyJ0b2tlbiI6IjE5ZjNjMjQ3NDE0NWQyZGQxMmIyODljNjU5ZDNhYWU2ZDk2OWE1N2UzNDAxMzM1YmY3ZjEwNWE2YzU3YzJiOGEwOGIzNzE5MTlhNTEzZTZiNmUxZTYxZjExMGI1MDJiNjJiZDMwNjQ1NzBhZjM5ZDYyNzBhMWUwMmE3NzQxOGVhMTA0NDQ0NGY4YWQxYjc0ZDRiMjdlM2RiNDRiN2JkY2IwMTI4NjFkMWYwMzIwNWI5OGNjNjdhZTdmMmZlMTVhYzJmNjU0YzE1Y2U4NTVhYTMwMDY3MWQ5MDdlMmE2NzhmNzFkNmVlZTU0NTIyMjZkNWY2NzAxMTUwY2M5NmEwNWIifQ%3D%3DInstagram by default removes the token, because of the = character. Upon successful authorization the
stateparameter returned by Instagram has been stripped from the token. This results in the signatures between what the Data Plug sent and what Instagram returns to be different and as a result Silhouette throws the Bad Signature error. To test that it's indeed the = character that is causing the issues we replaced the == with __ just before the redirect to instagram happens. As expected, Instagram is not removing the token in this case. In this case, thestateparameter has been modified and us a result we weren't able to pass the validation step once again. Removing the token entirely has another effect down the line, Silhouette is not able to identify which user connected the Data Plug and it throws another exception this time.As a result we concluded to disable the CSRF check for the time being. Also filled a bug report to Facebook that's currently under investigation.
Issue reported to Facebook: https://developers.facebook.com/support/bugs/511886289481673/