Matthew Meszaros 029bc27bfd feat: bind a browser sign-in to the browser that started it, so a handoff link cannot be forwarded: one-time state proves the callback answers a request this server made, not one THIS browser made, so anyone could run the flow against their own Google or OIDC account and send the resulting URL to someone else, whose browser would then hold the sender's session (RFC 9700 4.7.1); begin now mints a binding secret that never reaches the provider and never appears in a URL, the callback carries it into the handoff, and the exchange refuses a collection that cannot present it with sso_wrong_browser, while the comments this PR added are condensed to the constraint they exist to state

2026-08-28 01:44:39 -07:00

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feat: bind a browser sign-in to the browser that started it, so a handoff link cannot be forwarded: one-time state proves the callback answers a request this server made, not one THIS browser made, so anyone could run the flow against their own Google or OIDC account and send the resulting URL to someone else, whose browser would then hold the sender's session (RFC 9700 4.7.1); begin now mints a binding secret that never reaches the provider and never appears in a URL, the callback carries it into the handoff, and the exchange refuses a collection that cannot present it with sso_wrong_browser, while the comments this PR added are condensed to the constraint they exist to state

2026-08-28 01:44:39 -07:00