func EncryptMessage(msg *Message, keyID string, key *security.ManagedKey) error {
if key == nil {
return security.ErrInvalidKey
}
if key.Encrypted() {
return security.ErrKeyMustBeDecrypted
}
payload := &Message{
Sender: msg.Sender,
Content: msg.Content,
}
plaintext, err := json.Marshal(payload)
if err != nil {
return err
}
// TODO: incorporate last edit ID into nonce
nonce := []byte(msg.ID.String())
data := []byte(msg.Sender.ID)
digest, ciphertext, err := security.EncryptGCM(key, nonce, plaintext, data)
if err != nil {
return fmt.Errorf("message encrypt: %s", err)
}
digestStr := base64.URLEncoding.EncodeToString(digest)
cipherStr := base64.URLEncoding.EncodeToString(ciphertext)
msg.Sender = SessionView{
IdentityView: IdentityView{ID: msg.Sender.ID},
SessionID: msg.Sender.SessionID,
}
msg.Content = digestStr + "/" + cipherStr
msg.EncryptionKeyID = "v1/" + keyID
return nil
}
func TestGrants(t *testing.T) {
Convey("Grant a capability on a room", t, func() {
kms := security.LocalKMS()
kms.SetMasterKey(make([]byte, security.AES256.KeySize()))
ctx := scope.New()
client := &proto.Client{Agent: &proto.Agent{}}
client.FromRequest(ctx, &http.Request{})
backend := &mock.TestBackend{}
room, err := backend.CreateRoom(ctx, kms, true, "test")
So(err, ShouldBeNil)
rkey, err := room.MessageKey(ctx)
So(err, ShouldBeNil)
mkey := rkey.ManagedKey()
So(kms.DecryptKey(&mkey), ShouldBeNil)
// Sign in as alice and send an encrypted message with aliceSendTime
// as the nonce.
aliceSendTime := time.Now()
msgNonce := []byte(snowflake.NewFromTime(aliceSendTime).String())
aliceKey := &security.ManagedKey{
KeyType: security.AES256,
Plaintext: make([]byte, security.AES256.KeySize()),
}
grant, err := security.GrantSharedSecretCapability(aliceKey, rkey.Nonce(), nil, mkey.Plaintext)
So(err, ShouldBeNil)
alice := mock.TestSession("Alice", "A1", "ip1")
_, err = room.Join(ctx, alice)
So(err, ShouldBeNil)
msg := proto.Message{
ID: snowflake.NewFromTime(aliceSendTime),
UnixTime: proto.Time(aliceSendTime),
Content: "hello",
}
iv, err := base64.URLEncoding.DecodeString(grant.CapabilityID())
So(err, ShouldBeNil)
payload := grant.EncryptedPayload()
So(aliceKey.BlockCrypt(iv, aliceKey.Plaintext, payload, false), ShouldBeNil)
key := &security.ManagedKey{
KeyType: security.AES128,
}
So(json.Unmarshal(aliceKey.Unpad(payload), &key.Plaintext), ShouldBeNil)
digest, ciphertext, err := security.EncryptGCM(
key, msgNonce, []byte(msg.Content), []byte("Alice"))
So(err, ShouldBeNil)
digestStr := base64.URLEncoding.EncodeToString(digest)
cipherStr := base64.URLEncoding.EncodeToString(ciphertext)
msg.Content = digestStr + "/" + cipherStr
_, err = room.Send(ctx, alice, msg)
So(err, ShouldBeNil)
// Now sign in as bob and decrypt the message.
bobKey := &security.ManagedKey{
KeyType: security.AES256,
Plaintext: make([]byte, security.AES256.KeySize()),
}
//bobKey.Plaintext[0] = 1
grant, err = security.GrantSharedSecretCapability(bobKey, rkey.Nonce(), nil, mkey.Plaintext)
So(err, ShouldBeNil)
iv, err = base64.URLEncoding.DecodeString(grant.CapabilityID())
So(err, ShouldBeNil)
payload = grant.EncryptedPayload()
So(bobKey.BlockCrypt(iv, bobKey.Plaintext, payload, false), ShouldBeNil)
key = &security.ManagedKey{
KeyType: security.AES128,
}
So(json.Unmarshal(bobKey.Unpad(payload), &key.Plaintext), ShouldBeNil)
bob := mock.TestSession("Bob", "B1", "ip2")
_, err = room.Join(ctx, bob)
So(err, ShouldBeNil)
log, err := room.Latest(ctx, 1, 0)
So(err, ShouldBeNil)
So(len(log), ShouldEqual, 1)
msg = log[0]
parts := strings.Split(msg.Content, "/")
So(len(parts), ShouldEqual, 2)
digest, err = base64.URLEncoding.DecodeString(parts[0])
So(err, ShouldBeNil)
ciphertext, err = base64.URLEncoding.DecodeString(parts[1])
So(err, ShouldBeNil)
plaintext, err := security.DecryptGCM(key, msgNonce, digest, ciphertext, []byte("Alice"))
So(err, ShouldBeNil)
So(string(plaintext), ShouldEqual, "hello")
})
}
func (b *AccountManagerBinding) GenerateOTP(ctx scope.Context, heim *proto.Heim, kms security.KMS, account proto.Account) (*proto.OTP, error) {
encryptedKey, err := kms.GenerateEncryptedKey(OTPKeyType, "account", account.ID().String())
if err != nil {
return nil, err
}
key := encryptedKey.Clone()
if err := kms.DecryptKey(&key); err != nil {
return nil, err
}
iv, err := kms.GenerateNonce(OTPKeyType.BlockSize())
if err != nil {
return nil, err
}
t, err := b.DbMap.Begin()
if err != nil {
return nil, err
}
rawOTP, err := b.getRawOTP(t, account.ID())
if err != nil && err != proto.ErrOTPNotEnrolled {
rollback(ctx, t)
return nil, err
}
if err == nil {
if rawOTP.Validated {
rollback(ctx, t)
return nil, proto.ErrOTPAlreadyEnrolled
}
row := &OTP{AccountID: account.ID().String()}
if _, err := t.Delete(row); err != nil {
rollback(ctx, t)
return nil, err
}
}
otp, err := heim.NewOTP(account)
if err != nil {
rollback(ctx, t)
return nil, err
}
digest, encryptedURI, err := security.EncryptGCM(&key, iv, []byte(otp.URI), nil)
if err != nil {
rollback(ctx, t)
return nil, err
}
row := &OTP{
AccountID: account.ID().String(),
IV: iv,
EncryptedKey: encryptedKey.Ciphertext,
Digest: digest,
EncryptedURI: encryptedURI,
}
if err := t.Insert(row); err != nil {
// TODO: this could fail in the case of a race condition
// by the time that matters we should be on postgres 9.5 and using a proper upsert
rollback(ctx, t)
return nil, err
}
if err := t.Commit(); err != nil {
return nil, err
}
return otp, nil
}