Re: [Fetchmail-users] Frontier (Yahoo) OAuth

[grarpamp <gra...@gm...>]

> https://sourceforge.net/p/fetchmail/mailman/message/34628292/
>>    https://frontier.com/helpcenter/categories/internet/email/email-security-upgrade
> https://johnlane.ie/gmail-fetchmail-is-a-less-secure-app.html

OAuth2
https://tools.ietf.org/html/rfc6749
OAuth2 Bearer
https://tools.ietf.org/html/rfc6750
SASL-IR
http://tools.ietf.org/html/rfc4959
https://developers.google.com/gmail/xoauth2_protocol

If there's no suitable library [search / github?] it should be possible
to pass the preliminary bits out to a user program that returns
the needed token bits. Probably with env vars carrying
the name of a just then created mkstemp(3) file for the
return purpose. Vars for user / pass / authtype / server...
whatever fetchmail has for that particular session / connection.
Some users could write program scripts for contrib.
It's uglier than a library, and leaves a lot to the user,
but seems doable even in /bin/sh, wget, openssl base64,
etc... common system tools.