Update session key decryption to not allow SED packets (#255)

crypto/sessionkey.go

@@ -409,6 +409,11 @@ func decryptStreamWithSessionKey(
 	// Decrypt data packet
 	switch p := p.(type) {
 	case *packet.SymmetricallyEncrypted, *packet.AEADEncrypted:
+		if symPacket, ok := p.(*packet.SymmetricallyEncrypted); ok {
+			if !symPacket.IntegrityProtected {
+				return nil, errors.New("gopenpgp: message is not authenticated")
+			}
+		}
 		dc, err := sk.GetCipherFunc()
 		if err != nil {
 			return nil, errors.Wrap(err, "gopenpgp: unable to decrypt with session key")

crypto/sessionkey_test.go

@@ -408,3 +408,39 @@ func TestAEADDataPacketDecryption(t *testing.T) {
 
 	assert.Exactly(t, "hello world\n", decrypted.GetString())
 }
+
+func TestSEDDecryption(t *testing.T) {
+	pgpMessageData, err := ioutil.ReadFile("testdata/sed_message")
+	if err != nil {
+		t.Fatal("Expected no error when reading message data, got:", err)
+	}
+	pgpMessage, err := NewPGPMessageFromArmored(string(pgpMessageData))
+	if err != nil {
+		t.Fatal("Expected no error when creating message, got:", err)
+	}
+
+	split, err := pgpMessage.SplitMessage()
+	if err != nil {
+		t.Fatal("Expected no error when splitting, got:", err)
+	}
+
+	privateKey, err := NewKeyFromArmored(readTestFile("sed_key", false))
+	if err != nil {
+		t.Fatal("Expected no error when unarmoring key, got:", err)
+	}
+
+	kR, err := NewKeyRing(privateKey)
+	if err != nil {
+		t.Fatal("Expected no error when creating the keyring, got:", err)
+	}
+	defer kR.ClearPrivateParams()
+	sessionKey, err := kR.DecryptSessionKey(split.GetBinaryKeyPacket())
+	if err != nil {
+		t.Fatal("Expected no error when decrypting session key, got:", err)
+	}
+
+	_, err = sessionKey.Decrypt(split.GetBinaryDataPacket())
+	if err == nil {
+		t.Fatal("sed packets without authentication should not be allowed", err)
+	}
+}

crypto/testdata/sed_key

@@ -0,0 +1,82 @@
+-----BEGIN PGP PRIVATE KEY BLOCK-----
+Comment: Bob's OpenPGP Transferable Secret Key
+
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+=miES
+-----END PGP PRIVATE KEY BLOCK-----

crypto/testdata/sed_message

@@ -0,0 +1,14 @@
+-----BEGIN PGP MESSAGE-----
+
+hQGMA3wvqk35PDeyAQwAyfOgW1muzY3NhAeShMCUzoAeAY6BGeJ2vCVZ1JCELVNk
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+7FZr1phe3LZVUso6CUzJdyECJw==
+=meER
+-----END PGP MESSAGE-----