A session signed in without "This is my own device" can no longer
administer. The server withholds the account's permissions from it and the
JMAP proxy refuses registry methods beyond the account's own, the same gate
ADMINISTRATION=0 uses. A borrowed or shared machine is where nobody should
be able to reset a password or remove a domain.
An administrator in such a session still sees Administration in the account
menu, greyed out, with the reason and the fix: sign in again with the box
ticked. The server tells that session only that the account administers.
The gate now reads the body only when it could name a registry method --
"x: in the text, or a \u escape that could spell one -- so ordinary mail
traffic from an untrusted session is forwarded untouched.
1 new string, translated in all nine catalogues, quoting each language's own
label for the tickbox; strings falling back to English stay at 16.
ADMINISTRATION=0 at launch removes in-app administration for everyone. The
account's permissions are no longer sent to the browser, so the menu never
appears, and the JMAP proxy refuses Stalwart registry methods other than the
account's own (settings, password, app passwords, API keys, public keys,
masked addresses). Hiding the menu alone would have left an administrator's
browser console able to make every call the menu made.
With administration on, the request body streams through untouched as before;
only an installation that turns it off reads and checks the body, forwarding
the parsed form so the server receives exactly what was inspected.
jcoffey-dev