Sample
rustls 0.23.43: Prevent silent TLS protocol version and SNI omission when configuring rustls with restricted crypto providers or IP address literals
Verified sample for cargo rustls 0.23.43: Prevent silent TLS protocol version and SNI omission when configuring rustls with restricted crypto providers or IP…
sha256:5659ebf9abcf99a6b2de6c9e2f6eb5499ff88ee1b4d263e78c7611f3e745b7aa
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MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
rust linux x64 rust rust cargo
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| rust 1 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · cargo@1 |
2026-08-16 |
| rust 1 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · cargo@1 |
2026-08-18 |
Case
HOW- Goal
- Prevent silent TLS protocol version and SNI omission when configuring rustls with restricted crypto providers or IP address literals
- Packages
- Symbols
-
- rustls::ClientConfig::builder_with_provider
- rustls::ConfigBuilder::with_safe_default_protocol_versions
- rustls::pki_types::ServerName
- rustls::ClientConnection::new
- Environment
- rust
- Created
- 2026-08-16T08:23:44Z
Contract
- assert with_safe_default_protocol_versions() silently prunes TLS 1.2 when CryptoProvider has only TLS 1.3 cipher suites
- assert ClientHello supported_versions extension contains only TLS 1.3 when TLS 1.2 is pruned
- assert full CryptoProvider with_safe_default_protocol_versions() offers both TLS 1.3 and TLS 1.2 in supported_versions
- assert ServerName from DNS hostname includes SNI extension in ClientHello
- assert ServerName from IP literal silently omits SNI extension in ClientHello per RFC 6066
Files
- Cargo.lock
- Cargo.toml
- NOTES.md
- csx.json
- src/lib.rs