From 0135904f7d3e1c0e763adaefe267c736616e3d26 Mon Sep 17 00:00:00 2001
From: Christopher Speller <crspeller@gmail.com>
Date: Wed, 16 Nov 2016 19:28:52 -0500
Subject: Upgrading server dependancies (#4566)

---
 vendor/golang.org/x/crypto/ssh/keys.go | 38 ++++++++++++++++++++++++++++++++--
 1 file changed, 36 insertions(+), 2 deletions(-)

(limited to 'vendor/golang.org/x/crypto/ssh/keys.go')

diff --git a/vendor/golang.org/x/crypto/ssh/keys.go b/vendor/golang.org/x/crypto/ssh/keys.go
index 0324e1235..f2fc9b6c9 100644
--- a/vendor/golang.org/x/crypto/ssh/keys.go
+++ b/vendor/golang.org/x/crypto/ssh/keys.go
@@ -281,6 +281,12 @@ type PublicKey interface {
 	Verify(data []byte, sig *Signature) error
 }
 
+// CryptoPublicKey, if implemented by a PublicKey,
+// returns the underlying crypto.PublicKey form of the key.
+type CryptoPublicKey interface {
+	CryptoPublicKey() crypto.PublicKey
+}
+
 // A Signer can create signatures that verify against a public key.
 type Signer interface {
 	// PublicKey returns an associated PublicKey instance.
@@ -348,6 +354,10 @@ func (r *rsaPublicKey) Verify(data []byte, sig *Signature) error {
 	return rsa.VerifyPKCS1v15((*rsa.PublicKey)(r), crypto.SHA1, digest, sig.Blob)
 }
 
+func (r *rsaPublicKey) CryptoPublicKey() crypto.PublicKey {
+	return (*rsa.PublicKey)(r)
+}
+
 type dsaPublicKey dsa.PublicKey
 
 func (r *dsaPublicKey) Type() string {
@@ -416,6 +426,10 @@ func (k *dsaPublicKey) Verify(data []byte, sig *Signature) error {
 	return errors.New("ssh: signature did not verify")
 }
 
+func (k *dsaPublicKey) CryptoPublicKey() crypto.PublicKey {
+	return (*dsa.PublicKey)(k)
+}
+
 type dsaPrivateKey struct {
 	*dsa.PrivateKey
 }
@@ -509,6 +523,10 @@ func (key ed25519PublicKey) Verify(b []byte, sig *Signature) error {
 	return nil
 }
 
+func (k ed25519PublicKey) CryptoPublicKey() crypto.PublicKey {
+	return ed25519.PublicKey(k)
+}
+
 func supportedEllipticCurve(curve elliptic.Curve) bool {
 	return curve == elliptic.P256() || curve == elliptic.P384() || curve == elliptic.P521()
 }
@@ -604,6 +622,10 @@ func (key *ecdsaPublicKey) Verify(data []byte, sig *Signature) error {
 	return errors.New("ssh: signature did not verify")
 }
 
+func (k *ecdsaPublicKey) CryptoPublicKey() crypto.PublicKey {
+	return (*ecdsa.PublicKey)(k)
+}
+
 // NewSignerFromKey takes an *rsa.PrivateKey, *dsa.PrivateKey,
 // *ecdsa.PrivateKey or any other crypto.Signer and returns a corresponding
 // Signer instance. ECDSA keys must use P-256, P-384 or P-521.
@@ -700,8 +722,8 @@ func (s *wrappedSigner) Sign(rand io.Reader, data []byte) (*Signature, error) {
 }
 
 // NewPublicKey takes an *rsa.PublicKey, *dsa.PublicKey, *ecdsa.PublicKey,
-// ed25519.PublicKey, or any other crypto.Signer and returns a corresponding
-// Signer instance. ECDSA keys must use P-256, P-384 or P-521.
+// or ed25519.PublicKey returns a corresponding PublicKey instance.
+// ECDSA keys must use P-256, P-384 or P-521.
 func NewPublicKey(key interface{}) (PublicKey, error) {
 	switch key := key.(type) {
 	case *rsa.PublicKey:
@@ -731,6 +753,14 @@ func ParsePrivateKey(pemBytes []byte) (Signer, error) {
 	return NewSignerFromKey(key)
 }
 
+// encryptedBlock tells whether a private key is
+// encrypted by examining its Proc-Type header
+// for a mention of ENCRYPTED
+// according to RFC 1421 Section 4.6.1.1.
+func encryptedBlock(block *pem.Block) bool {
+	return strings.Contains(block.Headers["Proc-Type"], "ENCRYPTED")
+}
+
 // ParseRawPrivateKey returns a private key from a PEM encoded private key. It
 // supports RSA (PKCS#1), DSA (OpenSSL), and ECDSA private keys.
 func ParseRawPrivateKey(pemBytes []byte) (interface{}, error) {
@@ -739,6 +769,10 @@ func ParseRawPrivateKey(pemBytes []byte) (interface{}, error) {
 		return nil, errors.New("ssh: no key found")
 	}
 
+	if encryptedBlock(block) {
+		return nil, errors.New("ssh: cannot decode encrypted private keys")
+	}
+
 	switch block.Type {
 	case "RSA PRIVATE KEY":
 		return x509.ParsePKCS1PrivateKey(block.Bytes)
-- 
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