Hauke Mehrtens
2db148c062
WPA3 Specification v3.5 §13 defines the Transition Disable element sent
inside message 3 of the 4-way handshake. An AP that is no longer
offering a transition mode for its SSID sets the matching bit so that
compliant STAs permanently stop falling back to WPA-PSK / WPA-EAP /
open for that SSID, hardening against downgrade attacks and against
operator mistakes where a transition-mode BSS is briefly brought up on
an SSID that previously ran WPA3-only.
Expose this as a UCI list 'transition_disable' with three classes of
entries:
* The existing OpenWrt encryption tokens 'sae' (bit 0x01), 'sae-pk'
(0x02), 'wpa3' (0x04) and 'owe' (0x08) OR into the bitmap. SAE-PK
itself is not yet wired through wifi-scripts; the token only lets
an operator who configured SAE-PK out of band also hand the
matching bit to hostapd.
* 'on' derives the bitmap from the AP's auth_type ('sae' -> 0x01,
'eap2'/'eap192' -> 0x04, pure 'owe' -> 0x08) and overrides any
other explicit tokens in the same list. Transition BSSes
(psk-sae, eap-eap2, owe with owe_transition set) produce no
bits even under 'on' because they are by definition still in
transition.
* 'off' unconditionally suppresses the element regardless of any
other entries. Operators who need to revert a WPA3-only SSID back
to a transition mode can set this proactively, giving compliant
STAs time to forget the permanent bit before the mode change.
Leave the list unset by default. Advertising Transition Disable is a
one-way door -- once a compliant STA has seen the permanent bit for an
SSID it will refuse to associate to a transition-mode BSS of the same
name ever again -- so it must be opted in to per SSID, never flipped
on by a firmware bump. This also matches the WPA3 and Wi-Fi Enhanced
Open Deployment and Implementation Guide v1.1 Table 4 requirement that
Transition Disable be MAND disabled by default on APs.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Link: https://github.com/openwrt/openwrt/pull/23009
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
OpenWrt Project is a Linux operating system targeting embedded devices. Instead of trying to create a single, static firmware, OpenWrt provides a fully writable filesystem with package management. This frees you from the application selection and configuration provided by the vendor and allows you to customize the device through the use of packages to suit any application. For developers, OpenWrt is the framework to build an application without having to build a complete firmware around it; for users this means the ability for full customization, to use the device in ways never envisioned.
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Run
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LuCI Web Interface: Modern and modular interface to control the device via a web browser.
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OpenWrt Packages: Community repository of ported packages.
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OpenWrt Routing: Packages specifically focused on (mesh) routing.
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