While an empty realm attribute is technically allowed, it reduces
the amount of entropy that goes into the turn credentials hash.
This remains technically broken in the implementation as hash_ is
not recomputed when changing the realm from the initial empty string
value to the empty string. Before this change this lead to hash_ not
being set and the allocate request being treated as not having
enough details to authenticate, resulting in an endless loop of packets.
BUG=chromium:329978076
Change-Id: I3d1295f905a9fb58ca5bc6f82466896f79031865
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/344820
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Philipp Hancke <phancke@meta.com>
Reviewed-by: Christoffer Dewerin <jansson@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#41996}
4f244d0808