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Add comprehensive SSH key derivation logging
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Enhanced crypto.rs to log all key derivation values:
- exchange_hash, shared_secret_mpint
- All derived keys (encryption, IV, MAC keys)
- Helps diagnose 'Corrupted MAC' issue

Packet analysis completed:
- Captured full SSH handshake (4.6KB pcap)
- All keys logged for comparison
- OpenSSH client still rejects MAC

Next step: Compare with OpenSSH server or use test vectors
This commit is contained in:
Warren
2026-06-14 16:11:22 +08:00
parent fcde6c82ca
commit 506a9a0b80
1 changed files with 11 additions and 1 deletions
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12
markbase-core/src/ssh_server/crypto.rs
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@@ -75,8 +75,10 @@ impl SessionKeys {
let session_id = exchange_hash.to_vec();
info!("SessionKeys::derive() starting");
info!(" shared_secret ({} bytes): {:?}", shared_secret.len(), &shared_secret[..8]);
info!(" shared_secret ({} bytes): {:?}", shared_secret.len(), &shared_secret[..std::cmp::min(8, shared_secret.len())]);
info!(" shared_secret[0] = {} (>=0x80? {})", shared_secret[0], shared_secret[0] >= 0x80);
info!(" exchange_hash (H, {} bytes): {:?}", exchange_hash.len(), &exchange_hash[..8]);
info!(" session_id ({} bytes): {:?}", session_id.len(), &session_id[..8]);
// RFC 4253密钥派生公式：HASH(K || H || X || session_id)
// 其中K是shared_secret（需要mpint格式）
@@ -92,6 +94,14 @@ impl SessionKeys {
let iv_ctos = Self::derive_key_rfc4253(&shared_secret_mpint, exchange_hash, 'A', &session_id)?;
let iv_stoc = Self::derive_key_rfc4253(&shared_secret_mpint, exchange_hash, 'B', &session_id)?;
info!("Derived keys summary:");
info!(" encryption_key_ctos ({} bytes): {:?}", encryption_key_ctos.len(), &encryption_key_ctos[..std::cmp::min(16, encryption_key_ctos.len())]);
info!(" encryption_key_stoc ({} bytes): {:?}", encryption_key_stoc.len(), &encryption_key_stoc[..std::cmp::min(16, encryption_key_stoc.len())]);
info!(" iv_ctos ({} bytes): {:?}", iv_ctos.len(), &iv_ctos[..std::cmp::min(16, iv_ctos.len())]);
info!(" iv_stoc ({} bytes): {:?}", iv_stoc.len(), &iv_stoc[..std::cmp::min(16, iv_stoc.len())]);
info!(" mac_key_ctos ({} bytes): {:?}", mac_key_ctos.len(), &mac_key_ctos[..std::cmp::min(16, mac_key_ctos.len())]);
info!(" mac_key_stoc ({} bytes): {:?}", mac_key_stoc.len(), &mac_key_stoc[..std::cmp::min(16, mac_key_stoc.len())]);
Ok(Self {
session_id,
encryption_key_ctos,