Hi all, We had two working group sessions at the Berlin IETF meeting and I am happy about the progress on many of the subjects. We managed to progress token exchange, native apps, AMR, and authorization server meta-data. We also identified new use cases to explore with the device flow document.
We also did a call for adoption of the OAuth token binding functionality, which still needs to be confirmed on the mailing list. (Further emails will follow.) There are, however, aspects I am not happy with. I was hoping to make some progress on the mix-up mitigation and on the wider range of security documents. Here is how I see the story after talking to some meeting participants. 1) It seems that the solution approach to deal with the mix-up attack (only mix-up) described in draft-ietf-oauth-mix-up-mitigation-01 needs to be modified to reflect the preference of the working group. My impression (from speaking with participants at the meeting last week privately) is that there is interest in a solution that does not require protocol changes but rather relies on configuration. This may include a combination of exact redirect_URI matching + per-AS redirect_URI + session state checking. There are also other attacks described in draft-ietf-oauth-mix-up-mitigation-01, which need to be moved elsewhere to avoid confusion. 2) We need a new document, ideally a BCP, that serves as a high-level write-up describing various security issues with OAuth that points to the mostly existing documents for those who want to read the background information. Torsten has posted a mail to the list providing one possible outline of such a document. How does this sound? Ciao Hannes
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