442 lines
13 KiB
Go
442 lines
13 KiB
Go
package protocol
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import (
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"context"
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"crypto/ecdsa"
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"database/sql"
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"time"
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"github.com/golang/protobuf/proto"
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"github.com/pkg/errors"
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datasyncnode "github.com/vacp2p/mvds/node"
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datasyncproto "github.com/vacp2p/mvds/protobuf"
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"go.uber.org/zap"
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"github.com/status-im/status-go/eth-node/crypto"
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"github.com/status-im/status-go/eth-node/types"
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"github.com/status-im/status-go/protocol/datasync"
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datasyncpeer "github.com/status-im/status-go/protocol/datasync/peer"
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"github.com/status-im/status-go/protocol/encryption"
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"github.com/status-im/status-go/protocol/protobuf"
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"github.com/status-im/status-go/protocol/transport"
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v1protocol "github.com/status-im/status-go/protocol/v1"
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)
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// Whisper message properties.
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const (
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whisperTTL = 15
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whisperPoW = 0.002
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whisperPoWTime = 5
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)
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type messageProcessor struct {
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identity *ecdsa.PrivateKey
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datasync *datasync.DataSync
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protocol *encryption.Protocol
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transport transport.Transport
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logger *zap.Logger
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featureFlags featureFlags
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}
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func newMessageProcessor(
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identity *ecdsa.PrivateKey,
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database *sql.DB,
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enc *encryption.Protocol,
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transport transport.Transport,
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logger *zap.Logger,
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features featureFlags,
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) (*messageProcessor, error) {
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dataSyncTransport := datasync.NewNodeTransport()
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dataSyncNode, err := datasyncnode.NewPersistentNode(
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database,
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dataSyncTransport,
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datasyncpeer.PublicKeyToPeerID(identity.PublicKey),
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datasyncnode.BATCH,
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datasync.CalculateSendTime,
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logger,
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)
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if err != nil {
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return nil, err
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}
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ds := datasync.New(dataSyncNode, dataSyncTransport, features.datasync, logger)
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p := &messageProcessor{
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identity: identity,
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datasync: ds,
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protocol: enc,
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transport: transport,
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logger: logger,
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featureFlags: features,
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}
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// Initializing DataSync is required to encrypt and send messages.
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// With DataSync enabled, messages are added to the DataSync
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// but actual encrypt and send calls are postponed.
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// sendDataSync is responsible for encrypting and sending postponed messages.
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if features.datasync {
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ds.Init(p.sendDataSync)
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ds.Start(300 * time.Millisecond)
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}
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return p, nil
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}
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func (p *messageProcessor) Stop() {
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p.datasync.Stop() // idempotent op
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}
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// SendPrivateRaw takes encoded data, encrypts it and sends through the wire.
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func (p *messageProcessor) SendPrivateRaw(
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ctx context.Context,
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recipient *ecdsa.PublicKey,
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data []byte,
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messageType protobuf.ApplicationMetadataMessage_Type,
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) ([]byte, error) {
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p.logger.Debug(
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"sending a private message",
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zap.Binary("public-key", crypto.FromECDSAPub(recipient)),
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zap.String("site", "SendPrivateRaw"),
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)
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return p.sendPrivate(ctx, recipient, data, messageType)
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}
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// SendGroupRaw takes encoded data, encrypts it and sends through the wire,
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// always return the messageID
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func (p *messageProcessor) SendGroupRaw(
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ctx context.Context,
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recipients []*ecdsa.PublicKey,
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data []byte,
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messageType protobuf.ApplicationMetadataMessage_Type,
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) ([]byte, error) {
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p.logger.Debug(
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"sending a private group message",
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zap.String("site", "SendGroupRaw"),
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)
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// Calculate messageID first
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wrappedMessage, err := p.wrapMessageV1(data, messageType)
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if err != nil {
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return nil, errors.Wrap(err, "failed to wrap message")
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}
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messageID := v1protocol.MessageID(&p.identity.PublicKey, wrappedMessage)
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for _, recipient := range recipients {
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_, err = p.sendPrivate(ctx, recipient, data, messageType)
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if err != nil {
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return nil, errors.Wrap(err, "failed to send message")
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}
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}
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return messageID, nil
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}
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// sendPrivate sends data to the recipient identifying with a given public key.
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func (p *messageProcessor) sendPrivate(
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ctx context.Context,
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recipient *ecdsa.PublicKey,
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data []byte,
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messageType protobuf.ApplicationMetadataMessage_Type,
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) ([]byte, error) {
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p.logger.Debug("sending private message", zap.Binary("recipient", crypto.FromECDSAPub(recipient)))
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wrappedMessage, err := p.wrapMessageV1(data, messageType)
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if err != nil {
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return nil, errors.Wrap(err, "failed to wrap message")
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}
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messageID := v1protocol.MessageID(&p.identity.PublicKey, wrappedMessage)
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if p.featureFlags.datasync {
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if err := p.addToDataSync(recipient, wrappedMessage); err != nil {
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return nil, errors.Wrap(err, "failed to send message with datasync")
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}
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// No need to call transport tracking.
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// It is done in a data sync dispatch step.
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} else {
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messageSpec, err := p.protocol.BuildDirectMessage(p.identity, recipient, wrappedMessage)
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if err != nil {
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return nil, errors.Wrap(err, "failed to encrypt message")
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}
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hash, newMessage, err := p.sendMessageSpec(ctx, recipient, messageSpec)
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if err != nil {
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return nil, errors.Wrap(err, "failed to send a message spec")
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}
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p.transport.Track([][]byte{messageID}, hash, newMessage)
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}
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return messageID, nil
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}
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// sendPairInstallation sends data to the recipients, using DH
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func (p *messageProcessor) SendPairInstallation(
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ctx context.Context,
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recipient *ecdsa.PublicKey,
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data []byte,
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messageType protobuf.ApplicationMetadataMessage_Type,
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) ([]byte, error) {
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p.logger.Debug("sending private message", zap.Binary("recipient", crypto.FromECDSAPub(recipient)))
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wrappedMessage, err := p.wrapMessageV1(data, messageType)
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if err != nil {
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return nil, errors.Wrap(err, "failed to wrap message")
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}
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messageSpec, err := p.protocol.BuildDHMessage(p.identity, recipient, wrappedMessage)
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if err != nil {
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return nil, errors.Wrap(err, "failed to encrypt message")
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}
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hash, newMessage, err := p.sendMessageSpec(ctx, recipient, messageSpec)
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if err != nil {
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return nil, errors.Wrap(err, "failed to send a message spec")
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}
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messageID := v1protocol.MessageID(&p.identity.PublicKey, wrappedMessage)
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p.transport.Track([][]byte{messageID}, hash, newMessage)
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return messageID, nil
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}
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// EncodeMembershipUpdate takes a group and an optional chat message and returns the protobuf representation to be sent on the wire.
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// All the events in a group are encoded and added to the payload
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func (p *messageProcessor) EncodeMembershipUpdate(
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group *v1protocol.Group,
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chatMessage *protobuf.ChatMessage,
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) ([]byte, error) {
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message := v1protocol.MembershipUpdateMessage{
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ChatID: group.ChatID(),
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Events: group.Events(),
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Message: chatMessage,
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}
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encodedMessage, err := v1protocol.EncodeMembershipUpdateMessage(message)
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if err != nil {
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return nil, errors.Wrap(err, "failed to encode membership update message")
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}
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return encodedMessage, nil
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}
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// SendPublicRaw takes encoded data, encrypts it and sends through the wire.
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func (p *messageProcessor) SendPublicRaw(
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ctx context.Context,
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chatName string,
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data []byte,
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messageType protobuf.ApplicationMetadataMessage_Type,
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) ([]byte, error) {
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var newMessage *types.NewMessage
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wrappedMessage, err := p.wrapMessageV1(data, messageType)
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if err != nil {
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return nil, errors.Wrap(err, "failed to wrap message")
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}
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newMessage = &types.NewMessage{
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TTL: whisperTTL,
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Payload: wrappedMessage,
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PowTarget: whisperPoW,
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PowTime: whisperPoWTime,
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}
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hash, err := p.transport.SendPublic(ctx, newMessage, chatName)
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if err != nil {
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return nil, err
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}
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messageID := v1protocol.MessageID(&p.identity.PublicKey, wrappedMessage)
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p.transport.Track([][]byte{messageID}, hash, newMessage)
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return messageID, nil
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}
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// handleMessages expects a whisper message as input, and it will go through
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// a series of transformations until the message is parsed into an application
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// layer message, or in case of Raw methods, the processing stops at the layer
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// before.
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// It returns an error only if the processing of required steps failed.
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func (p *messageProcessor) handleMessages(shhMessage *types.Message, applicationLayer bool) ([]*v1protocol.StatusMessage, error) {
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logger := p.logger.With(zap.String("site", "handleMessages"))
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hlogger := logger.With(zap.ByteString("hash", shhMessage.Hash))
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var statusMessage v1protocol.StatusMessage
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err := statusMessage.HandleTransport(shhMessage)
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if err != nil {
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hlogger.Error("failed to handle transport layer message", zap.Error(err))
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return nil, err
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}
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err = p.handleEncryptionLayer(context.Background(), &statusMessage)
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if err != nil {
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hlogger.Debug("failed to handle an encryption message", zap.Error(err))
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}
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statusMessages, err := statusMessage.HandleDatasync(p.datasync)
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if err != nil {
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hlogger.Debug("failed to handle datasync message", zap.Error(err))
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}
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for _, statusMessage := range statusMessages {
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err := statusMessage.HandleApplicationMetadata()
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if err != nil {
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hlogger.Error("failed to handle application metadata layer message", zap.Error(err))
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}
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if applicationLayer {
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err = statusMessage.HandleApplication()
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if err != nil {
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hlogger.Error("failed to handle application layer message", zap.Error(err))
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}
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}
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}
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return statusMessages, nil
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}
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func (p *messageProcessor) handleEncryptionLayer(ctx context.Context, message *v1protocol.StatusMessage) error {
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logger := p.logger.With(zap.String("site", "handleEncryptionLayer"))
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publicKey := message.SigPubKey()
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err := message.HandleEncryption(p.identity, publicKey, p.protocol)
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if err == encryption.ErrDeviceNotFound {
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if err := p.handleErrDeviceNotFound(ctx, publicKey); err != nil {
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logger.Error("failed to handle ErrDeviceNotFound", zap.Error(err))
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}
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}
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if err != nil {
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return errors.Wrap(err, "failed to process an encrypted message")
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}
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return nil
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}
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func (p *messageProcessor) handleErrDeviceNotFound(ctx context.Context, publicKey *ecdsa.PublicKey) error {
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now := time.Now().Unix()
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advertise, err := p.protocol.ShouldAdvertiseBundle(publicKey, now)
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if err != nil {
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return err
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}
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if !advertise {
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return nil
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}
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messageSpec, err := p.protocol.BuildBundleAdvertiseMessage(p.identity, publicKey)
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if err != nil {
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return err
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}
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ctx, cancel := context.WithTimeout(ctx, time.Second)
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defer cancel()
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_, _, err = p.sendMessageSpec(ctx, publicKey, messageSpec)
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if err != nil {
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return err
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}
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p.protocol.ConfirmBundleAdvertisement(publicKey, now)
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return nil
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}
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func (p *messageProcessor) wrapMessageV1(encodedMessage []byte, messageType protobuf.ApplicationMetadataMessage_Type) ([]byte, error) {
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wrappedMessage, err := v1protocol.WrapMessageV1(encodedMessage, messageType, p.identity)
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if err != nil {
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return nil, errors.Wrap(err, "failed to wrap message")
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}
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return wrappedMessage, nil
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}
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func (p *messageProcessor) addToDataSync(publicKey *ecdsa.PublicKey, message []byte) error {
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groupID := datasync.ToOneToOneGroupID(&p.identity.PublicKey, publicKey)
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peerID := datasyncpeer.PublicKeyToPeerID(*publicKey)
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exist, err := p.datasync.IsPeerInGroup(groupID, peerID)
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if err != nil {
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return errors.Wrap(err, "failed to check if peer is in group")
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}
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if !exist {
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if err := p.datasync.AddPeer(groupID, peerID); err != nil {
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return errors.Wrap(err, "failed to add peer")
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}
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}
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_, err = p.datasync.AppendMessage(groupID, message)
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if err != nil {
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return errors.Wrap(err, "failed to append message to datasync")
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}
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return nil
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}
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// sendDataSync sends a message scheduled by the data sync layer.
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// Data Sync layer calls this method "dispatch" function.
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func (p *messageProcessor) sendDataSync(ctx context.Context, publicKey *ecdsa.PublicKey, encodedMessage []byte, payload *datasyncproto.Payload) error {
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messageIDs := make([][]byte, 0, len(payload.Messages))
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for _, payload := range payload.Messages {
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messageIDs = append(messageIDs, v1protocol.MessageID(&p.identity.PublicKey, payload.Body))
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}
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messageSpec, err := p.protocol.BuildDirectMessage(p.identity, publicKey, encodedMessage)
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if err != nil {
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return errors.Wrap(err, "failed to encrypt message")
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}
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hash, newMessage, err := p.sendMessageSpec(ctx, publicKey, messageSpec)
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if err != nil {
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return err
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}
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p.transport.Track(messageIDs, hash, newMessage)
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return nil
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}
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// sendMessageSpec analyses the spec properties and selects a proper transport method.
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func (p *messageProcessor) sendMessageSpec(ctx context.Context, publicKey *ecdsa.PublicKey, messageSpec *encryption.ProtocolMessageSpec) ([]byte, *types.NewMessage, error) {
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newMessage, err := messageSpecToWhisper(messageSpec)
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if err != nil {
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return nil, nil, err
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}
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logger := p.logger.With(zap.String("site", "sendMessageSpec"))
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var hash []byte
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switch {
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case messageSpec.SharedSecret != nil:
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logger.Debug("sending using shared secret")
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hash, err = p.transport.SendPrivateWithSharedSecret(ctx, newMessage, publicKey, messageSpec.SharedSecret)
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default:
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logger.Debug("sending partitioned topic")
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hash, err = p.transport.SendPrivateWithPartitioned(ctx, newMessage, publicKey)
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}
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if err != nil {
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return nil, nil, err
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}
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return hash, newMessage, nil
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}
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func messageSpecToWhisper(spec *encryption.ProtocolMessageSpec) (*types.NewMessage, error) {
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var newMessage *types.NewMessage
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payload, err := proto.Marshal(spec.Message)
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if err != nil {
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return newMessage, err
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}
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newMessage = &types.NewMessage{
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TTL: whisperTTL,
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Payload: payload,
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PowTarget: whisperPoW,
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PowTime: whisperPoWTime,
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}
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return newMessage, nil
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}
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// isPubKeyEqual checks that two public keys are equal
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func isPubKeyEqual(a, b *ecdsa.PublicKey) bool {
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// the curve is always the same, just compare the points
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return a.X.Cmp(b.X) == 0 && a.Y.Cmp(b.Y) == 0
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}
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