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79 lines
3.0 KiB
Go
79 lines
3.0 KiB
Go
package handshake
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import (
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"crypto/rand"
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"github.com/DefinedNet/noise"
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"github.com/slackhq/nebula/cert"
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)
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// Credential holds everything needed to participate in a handshake
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// at a given cert version. Version and Curve are read from Cert; the public
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// half of the static keypair likewise comes from Cert.PublicKey().
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type Credential struct {
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Cert cert.Certificate // the certificate
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Bytes []byte // pre-marshaled certificate bytes
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privateKey []byte // static private key (public half lives in Cert)
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publicKey []byte // static public key, the classical half for a v3 Cert
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kemKey noise.KEMKey // static KEM keypair of the Cert's suite, only for a v3 Cert
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cipherSuite noise.CipherSuite // pre-built cipher suite (DH + cipher + hash)
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}
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// NewCredential creates a Credential with all material needed for handshake
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// participation. The cipherSuite should be pre-built by the caller with the
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// appropriate DH function, cipher, and hash.
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//
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// For a version 3 certificate privateKey is the composite private key,
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// classical || the seed of its suite's KEM, matching the composite
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// Cert.PublicKey().
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func NewCredential(
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c cert.Certificate,
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hsBytes []byte,
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privateKey []byte,
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cipherSuite noise.CipherSuite,
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) *Credential {
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hc := &Credential{
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Cert: c,
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Bytes: hsBytes,
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privateKey: privateKey,
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publicKey: c.PublicKey(),
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cipherSuite: cipherSuite,
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}
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if suite := cert.PQSuiteOf(c); suite != cert.PQSuiteUnknown {
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// The pki checked the private key against the certificate, so both split.
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hc.publicKey, hc.kemKey.Public, _ = suite.SplitPublicKey(false, c.PublicKey())
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hc.privateKey, hc.kemKey.Private, _ = suite.SplitPrivateKey(false, privateKey)
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}
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return hc
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}
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// buildHandshakeState creates a noise.HandshakeState from this credential.
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// pskPlacement selects the noise psk modifier; 0 means none. A psk for
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// placements 2 and up is supplied later with SetPresharedKey. A hybrid
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// pattern also gets its KEM and the static KEM key.
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func (hc *Credential) buildHandshakeState(initiator bool, info subtypeInfo) (*noise.HandshakeState, error) {
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cfg := noise.Config{
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CipherSuite: hc.cipherSuite,
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Random: rand.Reader,
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Pattern: info.pattern,
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Initiator: initiator,
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StaticKeypair: noise.DHKey{Private: hc.privateKey, Public: hc.publicKey},
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PresharedKey: []byte{},
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PresharedKeyPlacement: info.pskPlacement,
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}
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if info.kem != nil {
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cfg.KEMFunc = info.kem
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cfg.StaticKEMKeypair = hc.kemKey
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}
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return noise.NewHandshakeState(cfg)
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}
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// GetCredentialFunc returns the handshake credential for the given version,
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// or nil if that version is not available.
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//
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// Implementations must return credentials drawn from a snapshot stable for
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// the lifetime of any single Machine. The Machine may call this multiple
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// times during a handshake (e.g. when negotiating to the peer's version)
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// and assumes the underlying static keypair is consistent across calls.
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type GetCredentialFunc func(v cert.Version) *Credential
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