* feat(proxy): hash UI passwords with PBKDF2 in FIPS mode
A FIPS OpenSSL refuses scrypt, so every password write fails there and
nobody can sign in with a password. When OpenSSL enforces FIPS, passwords
now use PBKDF2-HMAC-SHA256 at 600k iterations with a salt from OpenSSL's
DRBG, stored as "pbkdf2:" plus base64 of salt and key. Any other row is
refused with one error log and left as it is, and the boot migration does
nothing, because FIPS mode is for new deployments.
PBKDF2 at 600k takes about five times as long as scrypt, so in FIPS mode the
five request paths run it on one thread instead of the event loop. A single
thread keeps a login burst from using up a CPU quota, which is what stalls
the loop with asyncio.to_thread. A login that queued for that thread asks the
throttle again before it answers, so a burst of guesses can't get past a block
that the failures ahead of it just set.
The breached password check is off in FIPS mode, because it runs the
password through SHA-1.
A standard OpenSSL reads False at every new branch, so standard mode keeps
scrypt, inline, on the same rows.
Resolves LIT-8425
* fix(proxy): take FIPS logins one at a time and recheck the throttle first
A login that waited for the KDF thread asked the throttle again only after
deriving, so a burst for one user kept that thread busy long after the user
was blocked. Logins now wait for their turn on a lock and ask the throttle
when it comes, so a blocked login costs no PBKDF2 and only one login at a time
holds a place in the KDF queue. Password changes and invite claims no longer
wait behind a whole burst of logins.
* fix(proxy): keep PBKDF2 rows on a standard boot and warn when FIPS skips the breach check
A standard boot treated a pbkdf2: row as plaintext and hashed its text, so the
real password stopped working and the old row text signed in. The migration now
leaves a row of that exact shape alone. Any other pbkdf2: text still migrates.
FIPS mode now logs a warning when it skips a breach check that is turned on.
The one-thread test no longer depends on timing, and the new test variables are
annotated Final.
* fix(proxy): keep the breached password check on in FIPS mode
* fix(proxy): choose the password KDF from fips_mode instead of the host OpenSSL
* test(proxy): fake the scrypt probe in the FIPS fixture now that the gate checks scrypt
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