Comments (4)
I'll have to add two handshake extensions: the Supported Elliptic Curves Extension, and the Supported Point Formats Extension [ECC]:
Servers implementing ECC cipher suites MUST support these extensions, and when a client uses these extensions, servers MUST NOT negotiate the use of an ECC cipher suite unless they can complete the handshake while respecting the choice of curves and compression techniques specified by the client.
A part of those extensions is (1) choosing a preference list on the client side and (2) selecting the curve and the point format from the client preference list on the server side. Anybody has ideas on how it should be done? What should be our sane defaults for both client and server sides?
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There seems to be an emerging consensus that using custom curves is a bad idea, which at least leaves just the named curves to support. I think that means that our point format extension support can be very minimal. In terms of curves, 256p1 seems to be supported by just about everyone, so maybe we can start with just 256p1 as a named curve?
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Sounds like a simple and reasonable first version, I'll do that.
from s2n-tls.
384p1 is also popular and well supported by browsers. Anything outside of those two has limited support.
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Related Issues (20)
- Integ test bloat
- Make S2N_CERT_AUTH_OPTIONAL the default for clients
- Support loading DER-encoded certificates and private keys
- consider adding a default negotiate timeout
- enforce result checking for s2n_stuffer methods
- Unpin dependencies after bumping MSRV beyond 1.70
- add visible debugging information for CI runs
- old libfuzzer used in CI
- old cppcheck used in CI
- Add schannel to integration tests HOT 1
- docs: Rust bindings need an explanation for Send/Sync impls HOT 1
- Add rustls to integration tests HOT 3
- test: SSLv2 integ test
- s2n_tls13_cert_verify_test doesn't run all cases HOT 1
- certificate_signature_preferences field contains unnecessary information HOT 2
- UBSAN triggers on `is_available` getting passed an incorrect function type HOT 5
- version 1.4.5: s2n_shutdown_test fail HOT 2
- clang format all .c and .h files
- make it easier to evaluate the impacts of changing security policies
- Clarify return values of IO APIs in the API documentation
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