The redirector TLS question cannot be answered from the cipher OpenSSL
selected: its server follows client preference by default, so FIFA preferring
static RSA does not prove ECDHE was unavailable. Choosing a TLS stack on that
inference would be a guess. This reads the actual ClientHello.
PASSIVE BY CONSTRUCTION. Bytes relay verbatim both ways, nothing is injected
or rewritten, and the handshake is still terminated by the untouched Python
redirector. A parse failure logs and relays anyway -- observation must never be
able to break the path it observes.
Reports record/client version, supported_versions, SNI, every offered suite by
name, extensions, and a verdict on whether ANY forward-secret suite is offered,
which is exactly the rustls question. Unknown suites print as hex rather than
being dropped.
Verified end to end against the live Python redirector with openssl s_client:
31 offered suites parsed, 18 classified forward-secret, and Python logged the
relayed request and served its 406B serverinstanceinfo -- proving observation
AND pass-through in one run.
Unit-tested on truncated and non-TLS input; the verdict is asserted in both
directions so a static-RSA-only hello reports RULED OUT rather than defaulting
to the permissive answer.
NOTE: that 18-suite result is from openssl s_client, NOT from FIFA. It proves
the instrument works. The actual question is still open until a retail FIFA
ClientHello is captured.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
funman300
c5807c07a9