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1367 lines (1293 loc) · 48.6 KB
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// Copyright (c) 2021 Tulir Asokan
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package whatsmeow
import (
"bytes"
"compress/zlib"
"context"
"crypto/sha256"
"encoding/hex"
"errors"
"fmt"
"io"
"runtime/debug"
"strconv"
"time"
"github.com/polymorfa/libsignal-protocol-go/groups"
"github.com/polymorfa/libsignal-protocol-go/protocol"
"github.com/polymorfa/libsignal-protocol-go/session"
"github.com/polymorfa/libsignal-protocol-go/signalerror"
"github.com/polymorfa/libsignal-protocol-go/state/record"
"github.com/rs/zerolog"
"go.mau.fi/util/random"
"google.golang.org/protobuf/proto"
"github.com/polymorfa/hypermeow/appstate"
waBinary "github.com/polymorfa/hypermeow/binary"
"github.com/polymorfa/hypermeow/proto/waE2E"
"github.com/polymorfa/hypermeow/proto/waHistorySync"
"github.com/polymorfa/hypermeow/proto/waLidMigrationSyncPayload"
"github.com/polymorfa/hypermeow/proto/waWeb"
"github.com/polymorfa/hypermeow/store"
"github.com/polymorfa/hypermeow/types"
"github.com/polymorfa/hypermeow/types/events"
)
var pbSerializer = store.SignalProtobufSerializer
func (cli *Client) handleEncryptedMessage(ctx context.Context, node *waBinary.Node) {
info, err := cli.parseMessageInfo(node)
if err != nil {
cli.Log.Warnf("Failed to parse message: %v", err)
cli.sendAck(ctx, node, NackParsingError)
return
}
if !info.SenderAlt.IsEmpty() {
cli.StoreLIDPNMapping(ctx, info.SenderAlt, info.Sender)
} else if !info.RecipientAlt.IsEmpty() {
cli.StoreLIDPNMapping(ctx, info.RecipientAlt, info.Chat)
}
cli.updateMessageContactNames(ctx, info)
if info.Sender.Server == types.NewsletterServer {
var cancelled bool
defer cli.maybeDeferredAck(ctx, node)(&cancelled)
cancelled = cli.handlePlaintextMessage(ctx, info, node)
} else if cli.DisabledFeatures.Signal {
// The downstream decrypting client is responsible for acknowledging the message.
cli.dispatchEvent(&events.UndecryptedMessage{Info: *info, Raw: node})
} else {
cli.decryptMessages(ctx, info, node)
}
}
func (cli *Client) setSynchronousMessageNameUpdates(enabled bool) {
cli.synchronousMessageNameUpdates.Store(enabled)
}
func (cli *Client) updateMessageContactNames(ctx context.Context, info *types.MessageInfo) {
synchronous := cli.synchronousMessageNameUpdates.Load()
var verifiedName string
if info.VerifiedName != nil {
verifiedName = info.VerifiedName.Details.GetVerifiedName()
}
if len(verifiedName) > 0 {
if synchronous {
cli.updateBusinessName(ctx, info.Sender, info.SenderAlt, info, verifiedName)
} else {
go cli.updateBusinessName(ctx, info.Sender, info.SenderAlt, info, verifiedName)
}
}
if len(info.PushName) > 0 && info.PushName != "-" && (cli.MessengerConfig == nil || info.PushName != "username") {
if synchronous {
cli.updatePushName(ctx, info.Sender, info.SenderAlt, info, info.PushName)
} else {
go cli.updatePushName(ctx, info.Sender, info.SenderAlt, info, info.PushName)
}
}
}
func (cli *Client) handleUnencryptedMessage(ctx context.Context, node *waBinary.Node) {
info, err := cli.parseMessageInfo(node)
if err != nil {
cli.Log.Warnf("Failed to parse message: %v", err)
cli.sendAck(ctx, node, NackParsingError)
return
}
if info.Sender.Server != types.NewsletterServer {
cli.sendAck(ctx, node, 0)
return
}
info.IsNewsletterStatus = true
var cancelled bool
defer cli.maybeDeferredAck(ctx, node)(&cancelled)
cancelled = cli.handlePlaintextMessage(ctx, info, node)
}
func (cli *Client) parseMessageSource(node *waBinary.Node, requireParticipant bool) (source types.MessageSource, err error) {
clientID := cli.getOwnID()
clientLID := cli.getOwnLID()
if clientID.IsEmpty() {
err = ErrNotLoggedIn
return
}
ag := node.AttrGetter()
from := ag.JID("from")
source.AddressingMode = types.AddressingMode(ag.OptionalString("addressing_mode"))
if from.Server == types.GroupServer || from.Server == types.BroadcastServer {
source.IsGroup = true
source.Chat = from
if requireParticipant {
source.Sender = ag.JID("participant")
} else {
source.Sender = ag.OptionalJIDOrEmpty("participant")
}
source.SenderAlt = ag.OptionalJIDOrEmpty("participant_pn")
if source.SenderAlt.IsEmpty() && source.AddressingMode != types.AddressingModeLID {
source.SenderAlt = ag.OptionalJIDOrEmpty("participant_lid")
}
if source.Sender.User == clientID.User || source.Sender.User == clientLID.User {
source.IsFromMe = true
}
if from.Server == types.BroadcastServer {
source.BroadcastListOwner = ag.OptionalJIDOrEmpty("recipient")
participants, ok := node.GetOptionalChildByTag("participants")
if ok && source.IsFromMe {
children := participants.GetChildren()
source.BroadcastRecipients = make([]types.BroadcastRecipient, 0, len(children))
for _, child := range children {
if child.Tag != "to" {
continue
}
cag := child.AttrGetter()
mainJID := cag.JID("jid")
if mainJID.Server == types.HiddenUserServer {
source.BroadcastRecipients = append(source.BroadcastRecipients, types.BroadcastRecipient{
LID: mainJID,
PN: cag.OptionalJIDOrEmpty("peer_recipient_pn"),
})
} else {
source.BroadcastRecipients = append(source.BroadcastRecipients, types.BroadcastRecipient{
LID: cag.OptionalJIDOrEmpty("peer_recipient_lid"),
PN: mainJID,
})
}
}
}
}
} else if from.Server == types.NewsletterServer {
source.Chat = from
source.Sender = from
// TODO IsFromMe?
} else if from.User == clientID.User || from.User == clientLID.User {
if from.Server == types.HostedServer {
from.Server = types.DefaultUserServer
} else if from.Server == types.HostedLIDServer {
from.Server = types.HiddenUserServer
}
source.IsFromMe = true
source.Sender = from
recipient := ag.OptionalJID("recipient")
if recipient != nil {
source.Chat = *recipient
} else {
source.Chat = from.ToNonAD()
}
if source.Chat.Server == types.HiddenUserServer || source.Chat.Server == types.HostedLIDServer {
source.RecipientAlt = ag.OptionalJIDOrEmpty("peer_recipient_pn")
} else {
source.RecipientAlt = ag.OptionalJIDOrEmpty("peer_recipient_lid")
}
} else if from.IsBot() {
source.Sender = from
meta := node.GetChildByTag("meta")
ag = meta.AttrGetter()
targetChatJID := ag.OptionalJID("target_chat_jid")
if targetChatJID != nil {
source.Chat = targetChatJID.ToNonAD()
} else {
source.Chat = from
}
} else {
if from.Server == types.HostedServer {
from.Server = types.DefaultUserServer
} else if from.Server == types.HostedLIDServer {
from.Server = types.HiddenUserServer
}
source.Chat = from.ToNonAD()
source.Sender = from
if source.Sender.Server == types.HiddenUserServer || source.Chat.Server == types.HostedLIDServer {
source.SenderAlt = ag.OptionalJIDOrEmpty("sender_pn")
} else {
source.SenderAlt = ag.OptionalJIDOrEmpty("sender_lid")
}
}
if !source.SenderAlt.IsEmpty() && source.SenderAlt.Device == 0 {
source.SenderAlt.Device = source.Sender.Device
}
err = ag.Error()
return
}
func (cli *Client) parseMsgBotInfo(node waBinary.Node) (botInfo types.MsgBotInfo, err error) {
botNode := node.GetChildByTag("bot")
ag := botNode.AttrGetter()
botInfo.EditType = types.BotEditType(ag.OptionalString("edit"))
if botInfo.EditType == types.EditTypeInner || botInfo.EditType == types.EditTypeLast || botInfo.EditType == types.EditTypeFull {
botInfo.EditTargetID = types.MessageID(ag.OptionalString("edit_target_id"))
botInfo.EditSenderTimestampMS = ag.UnixMilli("sender_timestamp_ms")
}
botInfo.ClientThreadID = ag.OptionalString("client_thread_id")
err = ag.Error()
return
}
func (cli *Client) parseMsgMetaInfo(node waBinary.Node) (metaInfo types.MsgMetaInfo, err error) {
metaNode := node.GetChildByTag("meta")
ag := metaNode.AttrGetter()
metaInfo.TargetID = types.MessageID(ag.OptionalString("target_id"))
metaInfo.TargetSender = ag.OptionalJIDOrEmpty("target_sender_jid")
metaInfo.TargetChat = ag.OptionalJIDOrEmpty("target_chat_jid")
deprecatedLIDSession, ok := ag.GetBool("deprecated_lid_session", false)
if ok {
metaInfo.DeprecatedLIDSession = &deprecatedLIDSession
}
metaInfo.ThreadMessageID = types.MessageID(ag.OptionalString("thread_msg_id"))
metaInfo.ThreadMessageSenderJID = ag.OptionalJIDOrEmpty("thread_msg_sender_jid")
err = ag.Error()
return
}
func (cli *Client) parseMessageInfo(node *waBinary.Node) (*types.MessageInfo, error) {
var info types.MessageInfo
var err error
info.MessageSource, err = cli.parseMessageSource(node, true)
if err != nil {
return nil, err
}
ag := node.AttrGetter()
info.ID = types.MessageID(ag.String("id"))
info.ServerID = types.MessageServerID(ag.OptionalInt("server_id"))
info.Timestamp = ag.UnixTime("t")
info.PushName = ag.OptionalString("notify")
info.Category = ag.OptionalString("category")
info.Type = ag.OptionalString("type")
info.Edit = types.EditAttribute(ag.OptionalString("edit"))
if err = ag.Error(); err != nil {
return nil, err
}
for _, child := range node.GetChildren() {
switch child.Tag {
case "multicast":
info.Multicast = true
case "verified_name":
info.VerifiedName, err = parseVerifiedNameContent(child)
if err != nil {
cli.Log.Warnf("Failed to parse verified_name node in %s: %v", info.ID, err)
}
case "bot":
info.MsgBotInfo, err = cli.parseMsgBotInfo(child)
if err != nil {
cli.Log.Warnf("Failed to parse <bot> node in %s: %v", info.ID, err)
}
case "meta":
info.MsgMetaInfo, err = cli.parseMsgMetaInfo(child)
if err != nil {
cli.Log.Warnf("Failed to parse <meta> node in %s: %v", info.ID, err)
}
case "franking":
// TODO
case "trace":
// TODO
default:
if mediaType, ok := child.AttrGetter().GetString("mediatype", false); ok {
info.MediaType = mediaType
}
}
}
return &info, nil
}
func (cli *Client) handlePlaintextMessage(ctx context.Context, info *types.MessageInfo, node *waBinary.Node) (handlerFailed bool) {
// TODO edits have an additional <meta msg_edit_t="1696321271735" original_msg_t="1696321248"/> node
plaintext, ok := node.GetOptionalChildByTag("plaintext")
if !ok {
// 3:
return
}
plaintextBody, ok := plaintext.Content.([]byte)
if !ok {
cli.Log.Warnf("Plaintext message from %s doesn't have byte content", info.SourceString())
return
}
var msg waE2E.Message
err := proto.Unmarshal(plaintextBody, &msg)
if err != nil {
cli.Log.Warnf("Error unmarshaling plaintext message from %s: %v", info.SourceString(), err)
return
}
cli.storeMessageSecret(ctx, info, &msg)
evt := &events.Message{
Info: *info,
RawMessage: &msg,
}
meta, ok := node.GetOptionalChildByTag("meta")
if ok {
evt.NewsletterMeta = &events.NewsletterMessageMeta{
EditTS: meta.AttrGetter().UnixMilli("msg_edit_t"),
OriginalTS: meta.AttrGetter().UnixTime("original_msg_t"),
}
}
return cli.dispatchEvent(evt.UnwrapRaw())
}
func (cli *Client) migrateSessionStore(ctx context.Context, pn, lid types.JID) {
if cli.isRemoteSignal() {
cli.migrateRemoteSessions(ctx, pn, lid)
return
}
err := cli.Store.Sessions.MigratePNToLID(ctx, pn, lid)
if err != nil {
cli.Log.Errorf("Failed to migrate signal store from %s to %s: %v", pn, lid, err)
}
}
func (cli *Client) decryptMessages(ctx context.Context, info *types.MessageInfo, node *waBinary.Node) {
defer func() {
if err := recover(); err != nil {
cli.Log.Errorf("Message decryption for %s panicked: %v\n%s", info.ID, err, debug.Stack())
cli.sendAck(ctx, node, 0)
}
}()
unavailableNode, ok := node.GetOptionalChildByTag("unavailable")
if ok && len(node.GetChildrenByTag("enc")) == 0 {
uType := events.UnavailableType(unavailableNode.AttrGetter().String("type"))
cli.Log.Warnf("Unavailable message %s from %s (type: %q)", info.ID, info.SourceString(), uType)
cli.backgroundIfAsyncAck(func() {
cli.immediateRequestMessageFromPhone(ctx, info)
cli.sendAck(ctx, node, 0)
})
cli.dispatchEvent(&events.UndecryptableMessage{Info: *info, IsUnavailable: true, UnavailableType: uType})
return
}
children := node.GetChildren()
cli.Log.Debugf("Decrypting message from %s", info.SourceString())
containsDirectMsg := false
senderEncryptionJID := info.Sender
if info.Sender.Server == types.DefaultUserServer && !info.Sender.IsBot() {
if info.SenderAlt.Server == types.HiddenUserServer {
senderEncryptionJID = info.SenderAlt
cli.migrateSessionStore(ctx, info.Sender, info.SenderAlt)
} else if lid, err := cli.ResolveLID(ctx, info.Sender); err != nil {
cli.Log.Errorf("Failed to resolve LID for %s: %v", info.Sender, err)
if cli.SynchronousAck {
cli.sendRetryReceipt(ctx, node, info, false)
cli.sendAck(ctx, node, 0)
} else {
go cli.sendRetryReceipt(context.WithoutCancel(ctx), node, info, false)
go cli.sendAck(ctx, node, 0)
}
cli.dispatchEvent(&events.UndecryptableMessage{Info: *info})
return
} else {
cli.migrateSessionStore(ctx, info.Sender, lid)
senderEncryptionJID = lid
info.SenderAlt = lid
}
}
if cli.isRemoteSignal() {
cli.decryptMessagesRemote(ctx, info, node, senderEncryptionJID)
return
}
var recognizedStanza, protobufFailed bool
for _, child := range children {
if child.Tag != "enc" {
continue
}
recognizedStanza = true
ag := child.AttrGetter()
encType, ok := ag.GetString("type", false)
if !ok {
continue
}
var decrypted []byte
var ciphertextHash *[32]byte
var err error
if encType == "pkmsg" || encType == "msg" {
decrypted, ciphertextHash, err = cli.decryptDM(ctx, &child, senderEncryptionJID, encType == "pkmsg", info.Timestamp)
containsDirectMsg = true
} else if info.IsGroup && encType == "skmsg" {
decrypted, ciphertextHash, err = cli.decryptGroupMsg(ctx, &child, senderEncryptionJID, info.Chat, info.Timestamp)
} else if encType == "msmsg" && info.Sender.IsBot() {
targetSenderJID := info.MsgMetaInfo.TargetSender
if targetSenderJID.User == "" {
if info.Sender.Server == types.BotServer {
targetSenderJID = cli.getOwnLID()
} else {
targetSenderJID = cli.getOwnID()
}
}
decryptMessageID := info.ID
if (info.MsgBotInfo.EditType == types.EditTypeInner || info.MsgBotInfo.EditType == types.EditTypeLast || info.MsgBotInfo.EditType == types.EditTypeFull) && info.MsgBotInfo.EditTargetID != "" {
decryptMessageID = info.MsgBotInfo.EditTargetID
}
var msMsg waE2E.MessageSecretMessage
var messageSecret []byte
if messageSecret, _, err = cli.Store.MsgSecrets.GetMessageSecret(ctx, info.Chat, targetSenderJID, info.MsgMetaInfo.TargetID); err != nil {
err = fmt.Errorf("failed to get message secret for %s: %v", info.MsgMetaInfo.TargetID, err)
} else if messageSecret == nil {
err = fmt.Errorf("message secret for %s not found", info.MsgMetaInfo.TargetID)
} else if err = proto.Unmarshal(child.Content.([]byte), &msMsg); err != nil {
err = fmt.Errorf("failed to unmarshal MessageSecretMessage protobuf: %v", err)
} else {
decrypted, err = cli.decryptBotMessage(ctx, messageSecret, &msMsg, decryptMessageID, targetSenderJID, info)
if err != nil && decryptMessageID != info.ID {
decrypted, err = cli.decryptBotMessage(ctx, messageSecret, &msMsg, info.ID, targetSenderJID, info)
if err == nil {
cli.Log.Debugf("Decrypted bot message %s using own ID instead of edit target ID %s", info.ID, decryptMessageID)
}
}
}
} else {
cli.Log.Warnf("Unhandled encrypted message (type %s) from %s", encType, info.SourceString())
continue
}
if errors.Is(err, ErrEventAlreadyProcessed) {
cli.Log.Debugf("Ignoring message %s from %s: %v", info.ID, info.SourceString(), err)
continue
} else if errors.Is(err, signalerror.ErrOldCounter) {
cli.Log.Warnf("Ignoring message %s from %s: %v", info.ID, info.SourceString(), err)
continue
} else if errors.Is(err, ErrShadowGroupUnsupported) {
// A shadow can never make group ciphertext decryptable, so a retry
// receipt would only provoke redeliveries. Acknowledge, surface the
// message as undecryptable, and move on.
cli.Log.Warnf("Ignoring group message %s from %s: %v", info.ID, info.SourceString(), err)
cli.backgroundIfAsyncAck(func() {
cli.sendAck(ctx, node, 0)
})
cli.dispatchEvent(&events.UndecryptableMessage{
Info: *info,
IsUnavailable: true,
DecryptFailMode: events.DecryptFailMode(ag.OptionalString("decrypt-fail")),
})
continue
} else if err != nil {
cli.Log.Warnf("Error decrypting message %s from %s: %v", info.ID, info.SourceString(), err)
if ctx.Err() != nil || errors.Is(err, context.Canceled) {
return
}
isUnavailable := encType == "skmsg" && !containsDirectMsg && errors.Is(err, signalerror.ErrNoSenderKeyForUser)
if encType == "msmsg" {
cli.backgroundIfAsyncAck(func() {
cli.sendAck(ctx, node, NackMissingMessageSecret)
})
} else if cli.SynchronousAck {
cli.sendRetryReceipt(ctx, node, info, isUnavailable)
// TODO this probably isn't supposed to ack
cli.sendAck(ctx, node, 0)
} else {
go cli.sendRetryReceipt(context.WithoutCancel(ctx), node, info, isUnavailable)
go cli.sendAck(ctx, node, 0)
}
cli.dispatchEvent(&events.UndecryptableMessage{
Info: *info,
IsUnavailable: isUnavailable,
DecryptFailMode: events.DecryptFailMode(ag.OptionalString("decrypt-fail")),
})
return
}
retryCount := ag.OptionalInt("count")
cli.cancelDelayedRequestFromPhone(info.ID)
var msg waE2E.Message
var handlerFailed bool
switch ag.Int("v") {
case 2:
err = proto.Unmarshal(decrypted, &msg)
if err != nil {
cli.Log.Warnf("Error unmarshaling decrypted message from %s: %v", info.SourceString(), err)
protobufFailed = true
continue
}
protobufFailed = false
handlerFailed = cli.handleDecryptedMessage(ctx, info, &msg, retryCount)
case 3:
handlerFailed, protobufFailed = cli.handleDecryptedArmadillo(ctx, info, decrypted, retryCount)
default:
cli.Log.Warnf("Unknown version %d in decrypted message from %s", ag.Int("v"), info.SourceString())
}
if handlerFailed {
cli.Log.Warnf("Handler for %s failed", info.ID)
return
}
if ciphertextHash != nil && cli.EnableDecryptedEventBuffer {
// Use the context passed to decryptMessages
err = cli.Store.EventBuffer.ClearBufferedEventPlaintext(ctx, *ciphertextHash)
if err != nil {
zerolog.Ctx(ctx).Err(err).
Hex("ciphertext_hash", ciphertextHash[:]).
Str("message_id", info.ID).
Msg("Failed to clear buffered event plaintext")
} else {
zerolog.Ctx(ctx).Debug().
Hex("ciphertext_hash", ciphertextHash[:]).
Str("message_id", info.ID).
Msg("Deleted event plaintext from buffer")
}
if time.Since(cli.lastDecryptedBufferClear) > 12*time.Hour && ctx.Err() == nil {
cli.lastDecryptedBufferClear = time.Now()
go func() {
err := cli.Store.EventBuffer.DeleteOldBufferedHashes(context.WithoutCancel(ctx))
if err != nil {
zerolog.Ctx(ctx).Err(err).Msg("Failed to delete old buffered hashes")
}
}()
}
}
}
cli.backgroundIfAsyncAck(func() {
if !recognizedStanza {
cli.sendAck(ctx, node, NackUnrecognizedStanza)
} else if protobufFailed {
cli.sendAck(ctx, node, NackInvalidProtobuf)
} else {
cli.sendMessageReceipt(ctx, info, node)
}
})
}
func (cli *Client) clearUntrustedIdentity(ctx context.Context, target types.JID) error {
err := cli.Store.Identities.DeleteIdentity(ctx, target.SignalAddress().String())
if err != nil {
return fmt.Errorf("failed to delete identity: %w", err)
}
err = cli.Store.Sessions.DeleteSession(ctx, target.SignalAddress().String())
if err != nil {
return fmt.Errorf("failed to delete session: %w", err)
}
go cli.dispatchEvent(&events.IdentityChange{JID: target, Timestamp: time.Now(), Implicit: true})
return nil
}
var ErrEventAlreadyProcessed = errors.New("event was already processed")
// Deprecated: use ErrEventAlreadyProcessed.
var EventAlreadyProcessed = ErrEventAlreadyProcessed
func (cli *Client) bufferedDecrypt(
ctx context.Context,
ciphertext []byte,
serverTimestamp time.Time,
decrypt func(context.Context) ([]byte, error),
extraHashData ...string,
) (plaintext []byte, ciphertextHash [32]byte, err error) {
if !cli.EnableDecryptedEventBuffer {
plaintext, err = decrypt(ctx)
return
}
hasher := sha256.New()
hasher.Write(ciphertext)
for _, part := range extraHashData {
hasher.Write([]byte{0})
hasher.Write([]byte(part))
}
hasher.Write([]byte{0, 0})
ciphertextHash = *(*[32]byte)(hasher.Sum(nil))
var buf *store.BufferedEvent
buf, err = cli.Store.EventBuffer.GetBufferedEvent(ctx, ciphertextHash)
if err != nil {
err = fmt.Errorf("failed to get buffered event: %w", err)
return
} else if buf != nil {
if buf.Plaintext == nil {
zerolog.Ctx(ctx).Debug().
Hex("ciphertext_hash", ciphertextHash[:]).
Time("insertion_time", buf.InsertTime).
Msg("Returning event already processed error")
err = fmt.Errorf("%w at %s", ErrEventAlreadyProcessed, buf.InsertTime.String())
return
}
zerolog.Ctx(ctx).Debug().
Hex("ciphertext_hash", ciphertextHash[:]).
Time("insertion_time", buf.InsertTime).
Msg("Returning previously decrypted plaintext")
plaintext = buf.Plaintext
return
}
err = cli.Store.EventBuffer.DoDecryptionTxn(ctx, func(ctx context.Context) (innerErr error) {
plaintext, innerErr = decrypt(ctx)
if innerErr != nil {
return
}
innerErr = cli.Store.EventBuffer.PutBufferedEvent(ctx, ciphertextHash, plaintext, serverTimestamp)
if innerErr != nil {
innerErr = fmt.Errorf("failed to save decrypted event to buffer: %w", innerErr)
}
return
})
if err == nil {
zerolog.Ctx(ctx).Debug().
Hex("ciphertext_hash", ciphertextHash[:]).
Msg("Successfully decrypted and saved event")
}
return
}
type sessionlessSignalStore struct {
*store.Device
}
func (sessionlessSignalStore) StoreSession(_ context.Context, _ *protocol.SignalAddress, _ *record.Session) error {
return nil
}
func (cli *Client) decryptDM(ctx context.Context, child *waBinary.Node, from types.JID, isPreKey bool, serverTS time.Time) ([]byte, *[32]byte, error) {
if cli.isShadow() {
// A headless client holds no live Signal session; delegate
// decryption to the relay oracle.
return cli.shadowRelay.DecryptDM(ctx, child, from, isPreKey)
}
content, ok := child.Content.([]byte)
if !ok {
return nil, nil, fmt.Errorf("message content is not a byte slice")
}
builder := session.NewBuilderFromSignal(cli.Store, from.SignalAddress(), pbSerializer)
if isPreKey && child.AttrGetter().OptionalString("state") == "false" {
cli.Log.Debugf("Not storing session from stateless prekey message from %s", from)
builder = session.NewBuilderFromSignal(sessionlessSignalStore{cli.Store}, from.SignalAddress(), pbSerializer)
}
cipher := session.NewCipher(builder, from.SignalAddress())
var plaintext []byte
var ciphertextHash [32]byte
if isPreKey {
preKeyMsg, err := protocol.NewPreKeySignalMessageFromBytes(content, pbSerializer.PreKeySignalMessage, pbSerializer.SignalMessage)
if err != nil {
return nil, nil, fmt.Errorf("failed to parse prekey message: %w", err)
}
plaintext, ciphertextHash, err = cli.bufferedDecrypt(ctx, content, serverTS, func(decryptCtx context.Context) ([]byte, error) {
pt, innerErr := cipher.DecryptMessage(decryptCtx, preKeyMsg)
if cli.AutoTrustIdentity && errors.Is(innerErr, signalerror.ErrUntrustedIdentity) {
cli.Log.Warnf("Got %v error while trying to decrypt prekey message from %s, clearing stored identity and retrying", innerErr, from)
if innerErr = cli.clearUntrustedIdentity(decryptCtx, from); innerErr != nil {
innerErr = fmt.Errorf("failed to clear untrusted identity: %w", innerErr)
return nil, innerErr
}
pt, innerErr = cipher.DecryptMessage(decryptCtx, preKeyMsg)
}
return pt, innerErr
}, "prekey", from.String())
if err != nil {
return nil, nil, fmt.Errorf("failed to decrypt prekey message: %w", err)
}
} else {
msg, err := protocol.NewSignalMessageFromBytes(content, pbSerializer.SignalMessage)
if err != nil {
return nil, nil, fmt.Errorf("failed to parse normal message: %w", err)
}
plaintext, ciphertextHash, err = cli.bufferedDecrypt(ctx, content, serverTS, func(decryptCtx context.Context) ([]byte, error) {
return cipher.Decrypt(decryptCtx, msg)
}, "normal", from.String())
if err != nil {
return nil, nil, fmt.Errorf("failed to decrypt normal message: %w", err)
}
}
var err error
plaintext, err = unpadMessage(plaintext, child.AttrGetter().Int("v"))
if err != nil {
return nil, nil, fmt.Errorf("failed to unpad message: %w", err)
}
return plaintext, &ciphertextHash, nil
}
func (cli *Client) decryptGroupMsg(ctx context.Context, child *waBinary.Node, from types.JID, chat types.JID, serverTS time.Time) ([]byte, *[32]byte, error) {
if cli.isShadow() {
// Sender-key state must never be created or read in a headless shadow;
// the relay oracle covers direct messages only. Fail closed.
return nil, nil, ErrShadowGroupUnsupported
}
content, ok := child.Content.([]byte)
if !ok {
return nil, nil, fmt.Errorf("message content is not a byte slice")
}
senderKeyName := protocol.NewSenderKeyName(chat.String(), from.SignalAddress())
builder := groups.NewGroupSessionBuilder(cli.Store, pbSerializer)
cipher := groups.NewGroupCipher(builder, senderKeyName, cli.Store)
msg, err := protocol.NewSenderKeyMessageFromBytes(content, pbSerializer.SenderKeyMessage)
if err != nil {
return nil, nil, fmt.Errorf("failed to parse group message: %w", err)
}
plaintext, ciphertextHash, err := cli.bufferedDecrypt(ctx, content, serverTS, func(decryptCtx context.Context) ([]byte, error) {
return cipher.Decrypt(decryptCtx, msg)
}, "senderkey", chat.String(), from.String())
if err != nil {
return nil, nil, fmt.Errorf("failed to decrypt group message: %w", err)
}
plaintext, err = unpadMessage(plaintext, child.AttrGetter().Int("v"))
if err != nil {
return nil, nil, err
}
return plaintext, &ciphertextHash, nil
}
const checkPadding = true
type historySyncNotification struct {
messageID types.MessageID
notification *waE2E.HistorySyncNotification
}
func isValidPadding(plaintext []byte) bool {
lastByte := plaintext[len(plaintext)-1]
expectedPadding := bytes.Repeat([]byte{lastByte}, int(lastByte))
return bytes.HasSuffix(plaintext, expectedPadding)
}
func unpadMessage(plaintext []byte, version int) ([]byte, error) {
if version == 3 {
return plaintext, nil
} else if len(plaintext) == 0 {
return nil, fmt.Errorf("plaintext is empty")
} else if checkPadding && !isValidPadding(plaintext) {
return nil, fmt.Errorf("plaintext doesn't have expected padding")
} else {
return plaintext[:len(plaintext)-int(plaintext[len(plaintext)-1])], nil
}
}
func padMessage(plaintext []byte) []byte {
pad := random.Bytes(1)
pad[0] &= 0xf
if pad[0] == 0 {
pad[0] = 0xf
}
plaintext = append(plaintext, bytes.Repeat(pad, int(pad[0]))...)
return plaintext
}
func (cli *Client) handleSenderKeyDistributionMessage(ctx context.Context, chat, from types.JID, axolotlSKDM []byte) {
if cli.isShadow() {
return
}
builder := groups.NewGroupSessionBuilder(cli.Store, pbSerializer)
senderKeyName := protocol.NewSenderKeyName(chat.String(), from.SignalAddress())
sdkMsg, err := protocol.NewSenderKeyDistributionMessageFromBytes(axolotlSKDM, pbSerializer.SenderKeyDistributionMessage)
if err != nil {
cli.Log.Errorf("Failed to parse sender key distribution message from %s for %s: %v", from, chat, err)
return
}
err = builder.Process(ctx, senderKeyName, sdkMsg)
if err != nil {
cli.Log.Errorf("Failed to process sender key distribution message from %s for %s: %v", from, chat, err)
return
}
cli.Log.Debugf("Processed sender key distribution message from %s in %s", senderKeyName.Sender().String(), senderKeyName.GroupID())
}
func (cli *Client) handleHistorySyncNotificationLoop() {
defer func() {
cli.historySyncHandlerStarted.Store(false)
err := recover()
if err != nil {
cli.Log.Errorf("History sync handler panicked: %v\n%s", err, debug.Stack())
}
// Check in case something new appeared in the channel between the loop stopping
// and the atomic variable being updated. If yes, restart the loop.
if len(cli.historySyncNotifications) > 0 && cli.historySyncHandlerStarted.CompareAndSwap(false, true) {
cli.Log.Warnf("New history sync notifications appeared after loop stopped, restarting loop...")
go cli.handleHistorySyncNotificationLoop()
}
}()
ctx := cli.BackgroundEventCtx
for {
select {
case queued := <-cli.historySyncNotifications:
blob, err := cli.DownloadHistorySync(ctx, queued.notification, false)
if err != nil {
cli.Log.Errorf("Failed to download history sync: %v", err)
} else {
cli.dispatchEvent(&events.HistorySync{Data: blob, Notification: queued.notification, MessageID: queued.messageID})
if cli.shouldDeleteHistorySyncMedia() {
err = cli.DeleteMedia(ctx, MediaHistory, queued.notification.GetDirectPath(), queued.notification.GetFileEncSHA256(), queued.notification.GetEncHandle())
if err != nil {
cli.Log.Warnf("Failed to delete history sync media from server: %v", err)
}
}
}
case <-time.After(1 * time.Minute):
return
}
}
}
// SendHistorySyncServerErrorReceipt sends a history sync server-error receipt, which
// asks the phone to re-upload the referenced history sync payload.
func (cli *Client) SendHistorySyncServerErrorReceipt(ctx context.Context, msgID types.MessageID, mediaKey []byte) error {
ciphertext, iv, err := encryptMediaRetryReceipt(msgID, mediaKey)
if err != nil {
return fmt.Errorf("failed to encrypt history sync server-error receipt: %w", err)
}
ownID := cli.getOwnID().ToNonAD()
if ownID.IsEmpty() {
return ErrNotLoggedIn
}
err = cli.sendNode(ctx, waBinary.Node{
Tag: "receipt",
Attrs: waBinary.Attrs{
"id": string(msgID),
"type": "server-error",
"to": ownID,
"category": "peer",
},
Content: []waBinary.Node{
{Tag: "encrypt", Content: []waBinary.Node{
{Tag: "enc_p", Content: ciphertext},
{Tag: "enc_iv", Content: iv},
}},
},
})
if err != nil {
return fmt.Errorf("failed to send history sync server-error receipt: %w", err)
}
return nil
}
// DownloadHistorySync will download and parse the history sync blob from the given history sync notification.
//
// You only need to call this manually if you set [Client.ManualHistorySyncDownload] to true.
// By default, whatsmeow will call this automatically and dispatch an [events.HistorySync] with the parsed data.
func (cli *Client) DownloadHistorySync(ctx context.Context, notif *waE2E.HistorySyncNotification, synchronousStorage bool) (*waHistorySync.HistorySync, error) {
var data []byte
var err error
if notif.InitialHistBootstrapInlinePayload != nil {
data = notif.InitialHistBootstrapInlinePayload
} else if data, err = cli.Download(ctx, notif); err != nil {
return nil, fmt.Errorf("failed to download: %w", err)
}
var historySync waHistorySync.HistorySync
if reader, err := zlib.NewReader(bytes.NewReader(data)); err != nil {
return nil, fmt.Errorf("failed to prepare to decompress: %w", err)
} else if rawData, err := io.ReadAll(reader); err != nil {
return nil, fmt.Errorf("failed to decompress: %w", err)
} else if err = proto.Unmarshal(rawData, &historySync); err != nil {
return nil, fmt.Errorf("failed to unmarshal: %w", err)
}
cli.Log.Debugf("Received history sync (type %s, chunk %d, progress %d)", historySync.GetSyncType(), historySync.GetChunkOrder(), historySync.GetProgress())
storageCtx := ctx
if !synchronousStorage {
storageCtx = context.WithoutCancel(ctx)
}
nonceChanged := false
if historySync.CompanionMetaNonce != nil && cli.shouldStoreHistorySyncNonce() {
nonceChanged = cli.updateCompanionMetaNonce(historySync.GetCompanionMetaNonce())
}
storeHistorySync := cli.shouldStoreHistorySync()
doStorage := func(ctx context.Context) {
if nonceChanged {
cli.persistCompanionMetaNonce(ctx)
}
if !storeHistorySync {
return
}
if err := cli.storeNCTSalt(ctx, historySync.GetNctSalt()); err != nil {
cli.Log.Warnf("Failed to store NCT salt from history sync: %v", err)
}
if len(historySync.GetPhoneNumberToLidMappings()) > 0 {
cli.storeHistoricalPNLIDMappings(ctx, historySync.GetPhoneNumberToLidMappings())
}
if len(historySync.GetInlineContacts()) > 0 {
cli.storeHistoricalInlineContacts(ctx, historySync.GetInlineContacts())
}
if historySync.GetSyncType() == waHistorySync.HistorySync_PUSH_NAME {
cli.handleHistoricalPushNames(ctx, historySync.GetPushnames())
} else if len(historySync.GetConversations()) > 0 {
cli.storeHistoricalMessageSecrets(ctx, historySync.GetConversations())
}
if historySync.GlobalSettings != nil {
cli.storeGlobalSettings(ctx, historySync.GlobalSettings)
}
}
if !storeHistorySync && !nonceChanged {
return &historySync, nil
} else if synchronousStorage {
doStorage(storageCtx)
} else {
go doStorage(storageCtx)
}
return &historySync, nil
}
func historicalInlineContactEntries(contacts []*waHistorySync.InlineContact) ([]store.ContactEntry, []store.LIDMapping) {
entries := make([]store.ContactEntry, 0, len(contacts))
mappings := make([]store.LIDMapping, 0, len(contacts))
for _, contact := range contacts {
if contact == nil {
continue
}
pn, _ := types.ParseJID(contact.GetPnJID())
lid, _ := types.ParseJID(contact.GetLidJID())
if pn.Server == types.DefaultUserServer && lid.Server == types.HiddenUserServer {
mappings = append(mappings, store.LIDMapping{PN: pn.ToNonAD(), LID: lid.ToNonAD()})
}
jid := lid.ToNonAD()
if jid.Server != types.HiddenUserServer {
jid = pn.ToNonAD()
}
if jid.Server != types.HiddenUserServer && jid.Server != types.DefaultUserServer {
continue
}
entries = append(entries, store.ContactEntry{
JID: jid,
FirstName: contact.GetFirstName(),
FullName: contact.GetFullName(),
Username: contact.GetUsername(),
UsernameSet: true,
})
}
return entries, mappings
}
func (cli *Client) storeHistoricalInlineContacts(ctx context.Context, contacts []*waHistorySync.InlineContact) {
entries, mappings := historicalInlineContactEntries(contacts)
if len(mappings) > 0 {
if err := cli.Store.LIDs.PutManyLIDMappings(ctx, mappings); err != nil {
cli.Log.Warnf("Failed to store LID mappings from inline contacts: %v", err)
}
}
if len(entries) > 0 && cli.Store.Contacts != nil {
if err := cli.Store.Contacts.PutAllContactNames(ctx, entries); err != nil {
cli.Log.Warnf("Failed to store inline contacts: %v", err)
}
}
}
func (cli *Client) handleAppStateSyncKeyShare(ctx context.Context, keys *waE2E.AppStateSyncKeyShare) {
onlyResyncIfNotSynced := true
cli.Log.Debugf("Got %d new app state keys", len(keys.GetKeys()))
cli.appStateKeyRequestsLock.RLock()
for _, key := range keys.GetKeys() {
marshaledFingerprint, err := proto.Marshal(key.GetKeyData().GetFingerprint())
if err != nil {
cli.Log.Errorf("Failed to marshal fingerprint of app state sync key %X", key.GetKeyID().GetKeyID())
continue
}
_, isReRequest := cli.appStateKeyRequests[hex.EncodeToString(key.GetKeyID().GetKeyID())]
if isReRequest {
onlyResyncIfNotSynced = false
}
err = cli.Store.AppStateKeys.PutAppStateSyncKey(ctx, key.GetKeyID().GetKeyID(), store.AppStateSyncKey{
Data: key.GetKeyData().GetKeyData(),
Fingerprint: marshaledFingerprint,
Timestamp: key.GetKeyData().GetTimestamp(),
})
if err != nil {
cli.Log.Errorf("Failed to store app state sync key %X: %v", key.GetKeyID().GetKeyID(), err)
continue
}
cli.Log.Debugf("Received app state sync key %X (ts: %d)", key.GetKeyID().GetKeyID(), key.GetKeyData().GetTimestamp())
}
cli.appStateKeyRequestsLock.RUnlock()
for _, name := range appstate.AllPatchNames {
err := cli.FetchAppState(ctx, name, false, onlyResyncIfNotSynced)
if err != nil {
cli.Log.Errorf("Failed to do initial fetch of app state %s: %v", name, err)
}
}
}
func (cli *Client) handlePlaceholderResendResponse(msg *waE2E.PeerDataOperationRequestResponseMessage) (ok bool) {
reqID := msg.GetStanzaID()
parts := msg.GetPeerDataOperationResult()
cli.Log.Debugf("Handling response to placeholder resend request %s with %d items", reqID, len(parts))
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