Adding padding and length stuff
This commit is contained in:
rodič
7a94394e59
revize
6de91969ae
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@ -50,6 +50,7 @@ func NewGroup(server string) *Group {
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// SignGroup adds a signature to the group.
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func (g *Group) SignGroup(signature []byte) {
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g.SignedGroupID = signature
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copy(g.Timeline.SignedGroupId[:], g.SignedGroupID)
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}
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// Compromised should be called if we detect a a groupkey leak.
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@ -95,7 +96,7 @@ func (g *Group) AddMessage(message *protocol.DecryptedGroupMessage, verified boo
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return timelineMessage
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}
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// GetTimeline provides a safe copy of the timeline
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// GetTimeline provides a safe copy of the timeline-=
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func (g *Group) GetTimeline() (t []Message) {
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g.lock.Lock()
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t = g.Timeline.GetMessages()
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@ -16,6 +16,7 @@ func TestGroup(t *testing.T) {
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SignedGroupId: []byte{},
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Signature: []byte{},
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PreviousMessageSig: []byte{},
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Padding: []byte{},
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}
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encMessage := g.EncryptMessage(dgm)
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ok, message := g.DecryptMessage(encMessage)
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@ -9,8 +9,9 @@ import (
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// Timeline encapsulates a collection of ordered messages, and a mechanism to access them
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// in a threadsafe manner.
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type Timeline struct {
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Messages []Message
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lock sync.Mutex
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Messages []Message
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SignedGroupId []byte
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lock sync.Mutex
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}
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// Message is a local representation of a given message sent over a group chat channel.
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@ -54,14 +55,14 @@ func (t *Timeline) Swap(i, j int) {
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t.Messages[i], t.Messages[j] = t.Messages[j], t.Messages[i]
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}
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// Less checks 2 messages (i andj) in the timeline and returns true if i cccured before j, else false
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// Less checks 2 messages (i andj) in the timeline and returns true if i occcured before j, else false
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func (t *Timeline) Less(i, j int) bool {
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if t.Messages[i].Timestamp.Before(t.Messages[j].Timestamp) {
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return true
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}
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if compareSignatures(t.Messages[i].PreviousMessageSig, []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}) {
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if compareSignatures(t.Messages[i].PreviousMessageSig, t.SignedGroupId) {
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return true
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}
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@ -3,10 +3,44 @@ package model
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import (
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"git.mascherari.press/cwtch/protocol"
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"github.com/golang/protobuf/proto"
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"strconv"
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"testing"
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"time"
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)
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func TestMessagePadding(t *testing.T) {
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// Setup the Group
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sarah := GenerateNewProfile("Sarah")
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alice := GenerateNewProfile("Alice")
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sarah.AddContact(alice.Onion, &alice.PublicProfile)
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alice.AddContact(sarah.Onion, &sarah.PublicProfile)
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gid, invite, _ := alice.StartGroup("aaa.onion")
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gci := &protocol.CwtchPeerPacket{}
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proto.Unmarshal(invite, gci)
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sarah.ProcessInvite(gci.GetGroupChatInvite(), alice.Onion)
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group := alice.GetGroupByGroupID(gid)
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c1, _ := sarah.EncryptMessageToGroup("Hello World 1", group.GroupID)
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t.Logf("Length of Encrypted Message: %v", len(c1))
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alice.AttemptDecryption(c1)
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c2, _ := alice.EncryptMessageToGroup("Hello World 2", group.GroupID)
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t.Logf("Length of Encrypted Message: %v", len(c2))
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alice.AttemptDecryption(c2)
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c3, _ := alice.EncryptMessageToGroup("Hello World 3", group.GroupID)
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t.Logf("Length of Encrypted Message: %v", len(c3))
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alice.AttemptDecryption(c3)
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c4, _ := alice.EncryptMessageToGroup("Hello World this is a much longer message 3", group.GroupID)
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t.Logf("Length of Encrypted Message: %v", len(c4))
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alice.AttemptDecryption(c4)
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}
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func TestTranscriptConsistency(t *testing.T) {
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timeline := new(Timeline)
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@ -26,20 +60,25 @@ func TestTranscriptConsistency(t *testing.T) {
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t.Logf("group: %v, sarah %v", group, sarah)
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c1, _ := sarah.EncryptMessageToGroup("Hello World 1", group.GroupID)
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t.Logf("Length of Encrypted Message: %v", len(c1))
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alice.AttemptDecryption(c1)
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c2, _ := alice.EncryptMessageToGroup("Hello World 2", group.GroupID)
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t.Logf("Length of Encrypted Message: %v", len(c2))
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alice.AttemptDecryption(c2)
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c3, _ := alice.EncryptMessageToGroup("Hello World 3", group.GroupID)
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t.Logf("Length of Encrypted Message: %v", len(c3))
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alice.AttemptDecryption(c3)
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time.Sleep(time.Second * 1)
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c4, _ := alice.EncryptMessageToGroup("Hello World 4", group.GroupID)
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t.Logf("Length of Encrypted Message: %v", len(c4))
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alice.AttemptDecryption(c4)
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c5, _ := alice.EncryptMessageToGroup("Hello World 5", group.GroupID)
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t.Logf("Length of Encrypted Message: %v", len(c5))
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_, m1 := sarah.AttemptDecryption(c1)
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_, m2 := sarah.AttemptDecryption(c2)
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@ -55,6 +94,10 @@ func TestTranscriptConsistency(t *testing.T) {
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timeline.Insert(m2)
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for i, m := range timeline.GetMessages() {
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if m.Message != "Hello World "+strconv.Itoa(i+1) {
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t.Fatalf("Timeline Out of Order!: %v %v", i, m)
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}
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t.Logf("Messages %v: %v %x %x", i, m.Message, m.Signature, m.PreviousMessageSig)
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}
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}
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@ -10,6 +10,7 @@ import (
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"github.com/golang/protobuf/proto"
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"github.com/s-rah/go-ricochet/utils"
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"golang.org/x/crypto/ed25519"
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"io"
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"io/ioutil"
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"strconv"
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"time"
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@ -177,6 +178,12 @@ func (p *Profile) AttemptDecryption(ciphertext []byte) (bool, *Message) {
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return false, nil
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}
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func getRandomness(arr *[]byte) {
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if _, err := io.ReadFull(rand.Reader, (*arr)[:]); err != nil {
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utils.CheckError(err)
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}
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}
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// EncryptMessageToGroup when given a message and a group, encrypts and signs the message under the group and
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// profile
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func (p *Profile) EncryptMessageToGroup(message string, groupID string) ([]byte, error) {
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@ -188,8 +195,13 @@ func (p *Profile) EncryptMessageToGroup(message string, groupID string) ([]byte,
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if len(group.Timeline.Messages) > 0 {
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prevSig = group.Timeline.Messages[len(group.Timeline.Messages)-1].Signature
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} else {
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prevSig = []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
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prevSig = group.SignedGroupID
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}
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lenPadding := 1024 - len(message)
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padding := make([]byte, lenPadding)
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getRandomness(&padding)
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dm := &protocol.DecryptedGroupMessage{
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Onion: proto.String(p.Onion),
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Text: proto.String(message),
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@ -197,6 +209,7 @@ func (p *Profile) EncryptMessageToGroup(message string, groupID string) ([]byte,
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Timestamp: proto.Int32(int32(timestamp)),
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Signature: signature,
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PreviousMessageSig: prevSig,
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Padding: padding[:],
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}
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ciphertext := group.EncryptMessage(dm)
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return ciphertext, nil
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@ -90,7 +90,9 @@ type DecryptedGroupMessage struct {
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Signature []byte `protobuf:"bytes,4,req,name=signature" json:"signature,omitempty"`
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SignedGroupId []byte `protobuf:"bytes,5,req,name=signed_group_id,json=signedGroupId" json:"signed_group_id,omitempty"`
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PreviousMessageSig []byte `protobuf:"bytes,6,req,name=previous_message_sig,json=previousMessageSig" json:"previous_message_sig,omitempty"`
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XXX_unrecognized []byte `json:"-"`
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// Used to prevent analysis on text length, length is 1024 - len(text)
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Padding []byte `protobuf:"bytes,7,req,name=padding" json:"padding,omitempty"`
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XXX_unrecognized []byte `json:"-"`
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}
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func (m *DecryptedGroupMessage) Reset() { *m = DecryptedGroupMessage{} }
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@ -140,6 +142,13 @@ func (m *DecryptedGroupMessage) GetPreviousMessageSig() []byte {
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return nil
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}
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func (m *DecryptedGroupMessage) GetPadding() []byte {
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if m != nil {
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return m.Padding
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}
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return nil
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}
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var E_ServerNonce = &proto.ExtensionDesc{
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ExtendedType: (*control.ChannelResult)(nil),
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ExtensionType: ([]byte)(nil),
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@ -160,28 +169,29 @@ func init() {
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func init() { proto.RegisterFile("group_message.proto", fileDescriptor2) }
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var fileDescriptor2 = []byte{
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// 358 bytes of a gzipped FileDescriptorProto
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0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x7c, 0x52, 0xcd, 0x4a, 0xeb, 0x40,
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0x14, 0x26, 0xfd, 0xb9, 0xdc, 0x9e, 0xa6, 0xbd, 0xdc, 0xb9, 0xbd, 0x3a, 0x88, 0x48, 0xc8, 0x42,
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0xba, 0x2a, 0xe2, 0xd2, 0x22, 0x08, 0x15, 0x45, 0x50, 0x91, 0xf4, 0x01, 0x42, 0x48, 0x4e, 0x93,
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0xc1, 0x64, 0x66, 0x98, 0x99, 0x54, 0x7d, 0x03, 0x1f, 0xce, 0xbd, 0xaf, 0x23, 0x99, 0x34, 0x6d,
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0xea, 0xc2, 0xd5, 0x70, 0xbe, 0xdf, 0xc3, 0x61, 0xe0, 0x5f, 0xaa, 0x44, 0x29, 0xc3, 0x02, 0xb5,
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0x8e, 0x52, 0x9c, 0x49, 0x25, 0x8c, 0x20, 0xbf, 0xed, 0x13, 0x8b, 0xfc, 0x68, 0xb2, 0x10, 0xdc,
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0x28, 0x91, 0x2f, 0xb2, 0x88, 0x73, 0xcc, 0x6b, 0xde, 0xff, 0x70, 0xe0, 0xef, 0xe2, 0xc5, 0xc4,
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0xd9, 0x12, 0xd5, 0x1a, 0xd5, 0x53, 0x14, 0x3f, 0xa3, 0x21, 0x73, 0x18, 0xed, 0x85, 0x51, 0xc7,
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0x73, 0xa6, 0xc3, 0xf3, 0x83, 0x59, 0x93, 0x36, 0xbb, 0xad, 0xe8, 0x87, 0x9a, 0x0d, 0xdc, 0xb4,
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0x35, 0x55, 0xe6, 0x15, 0x9a, 0x38, 0xdb, 0x9a, 0x3b, 0xdf, 0xcd, 0x37, 0x15, 0xbd, 0x35, 0xaf,
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0x5a, 0x13, 0xb9, 0x84, 0xf1, 0x5e, 0xb3, 0xa6, 0x5d, 0xaf, 0xfb, 0x43, 0xf5, 0xa8, 0x5d, 0xad,
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0xfd, 0x31, 0xb8, 0xed, 0x70, 0xff, 0x1e, 0xdc, 0xb6, 0x9c, 0x9c, 0x00, 0xc4, 0x4c, 0x66, 0xa8,
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0x0c, 0xbe, 0x1a, 0xea, 0x78, 0x9d, 0xa9, 0x1b, 0xb4, 0x10, 0x72, 0x0c, 0x03, 0x2d, 0xa3, 0x22,
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0x2d, 0x23, 0x95, 0xd0, 0x8e, 0xa5, 0x77, 0x80, 0xff, 0xe9, 0xc0, 0xff, 0x6b, 0x8c, 0xd5, 0x9b,
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0x34, 0x98, 0xec, 0xe5, 0x4e, 0xa0, 0x2f, 0x38, 0x13, 0xdc, 0x46, 0x0e, 0x82, 0x7a, 0xa8, 0xd2,
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0x0c, 0x2b, 0x50, 0x9b, 0xa8, 0x90, 0x36, 0xad, 0x1f, 0xec, 0x00, 0x42, 0xa0, 0x67, 0xb7, 0xe8,
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0x5a, 0x4b, 0x6f, 0xdb, 0xcf, 0x52, 0x1e, 0x99, 0x52, 0x21, 0xed, 0x6d, 0xfa, 0x1b, 0x80, 0x9c,
|
||||
0xc2, 0x9f, 0x6a, 0xc0, 0x24, 0xac, 0x6f, 0xc4, 0x12, 0xda, 0xb7, 0x9a, 0x51, 0x0d, 0xdb, 0x95,
|
||||
0xee, 0x12, 0x72, 0x06, 0x13, 0xa9, 0x70, 0xcd, 0x44, 0xa9, 0x9b, 0x3b, 0x86, 0x9a, 0xa5, 0xf4,
|
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0x97, 0x15, 0x93, 0x86, 0xdb, 0x2c, 0xbf, 0x64, 0xe9, 0xc5, 0x1c, 0x5c, 0x6d, 0x3f, 0x40, 0xc8,
|
||||
0x05, 0x8f, 0x91, 0x1c, 0xee, 0xce, 0xbd, 0xf9, 0x2f, 0x01, 0xea, 0x32, 0x37, 0xf4, 0xfd, 0xca,
|
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0x73, 0xa6, 0x6e, 0x30, 0xac, 0xd5, 0x8f, 0x95, 0xf8, 0x2b, 0x00, 0x00, 0xff, 0xff, 0x54, 0x1a,
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0x6d, 0xda, 0x79, 0x02, 0x00, 0x00,
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// 372 bytes of a gzipped FileDescriptorProto
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0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x7c, 0x52, 0xdd, 0xaa, 0xd3, 0x30,
|
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0x1c, 0xa7, 0xfb, 0x70, 0xee, 0xbf, 0x6e, 0x62, 0x9c, 0x1a, 0x44, 0xa4, 0xf4, 0x42, 0x76, 0x35,
|
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0xc4, 0x4b, 0x87, 0x20, 0x4c, 0x14, 0x41, 0x45, 0xba, 0x07, 0x28, 0xa1, 0xfd, 0x2f, 0x0d, 0xb6,
|
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0x49, 0x48, 0xd2, 0x9d, 0x73, 0xde, 0xe0, 0x3c, 0xdc, 0x79, 0x99, 0xf3, 0x06, 0x87, 0xa6, 0xeb,
|
||||
0xd6, 0x9d, 0x8b, 0x73, 0x55, 0x7e, 0xdf, 0x21, 0x0d, 0xbc, 0xe2, 0x46, 0xd5, 0x3a, 0xad, 0xd0,
|
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0x5a, 0xc6, 0x71, 0xad, 0x8d, 0x72, 0x8a, 0x3c, 0xf7, 0x9f, 0x4c, 0x95, 0xef, 0x96, 0x5b, 0x25,
|
||||
0x9d, 0x51, 0xe5, 0xb6, 0x60, 0x52, 0x62, 0xd9, 0xea, 0xf1, 0x5d, 0x00, 0x2f, 0xb7, 0x57, 0x2e,
|
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0x2b, 0x76, 0x68, 0x0e, 0x68, 0xfe, 0xb1, 0xec, 0x3f, 0x3a, 0xb2, 0x81, 0xf9, 0x45, 0x19, 0x0d,
|
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0xa2, 0x60, 0x35, 0xfb, 0xfc, 0x66, 0xdd, 0xb5, 0xad, 0x7f, 0x36, 0xf2, 0x9f, 0x56, 0x4d, 0x42,
|
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0xde, 0x43, 0x4d, 0x78, 0x8f, 0x2e, 0x2b, 0x4e, 0xe1, 0xc1, 0xe3, 0xf0, 0x8f, 0x46, 0x3e, 0x85,
|
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0xf7, 0x3d, 0x44, 0xbe, 0xc2, 0xe2, 0x62, 0xd9, 0xd2, 0x61, 0x34, 0x7c, 0x62, 0x7a, 0xde, 0x9f,
|
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0xb6, 0xf1, 0x02, 0xc2, 0x7e, 0x79, 0xfc, 0x1b, 0xc2, 0xbe, 0x9d, 0x7c, 0x00, 0xc8, 0x84, 0x2e,
|
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0xd0, 0x38, 0xbc, 0x76, 0x34, 0x88, 0x06, 0xab, 0x30, 0xe9, 0x31, 0xe4, 0x3d, 0x4c, 0xad, 0x66,
|
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0x15, 0xaf, 0x99, 0xc9, 0xe9, 0xc0, 0xcb, 0x67, 0x22, 0xbe, 0x0f, 0xe0, 0xf5, 0x77, 0xcc, 0xcc,
|
||||
0x8d, 0x76, 0x98, 0x5f, 0xf4, 0x2e, 0x61, 0xac, 0xa4, 0x50, 0xd2, 0x57, 0x4e, 0x93, 0x16, 0x34,
|
||||
0x6d, 0x4e, 0x54, 0x68, 0x1d, 0xab, 0xb4, 0x6f, 0x1b, 0x27, 0x67, 0x82, 0x10, 0x18, 0xf9, 0x53,
|
||||
0x0c, 0x7d, 0x64, 0x74, 0xda, 0x17, 0x5c, 0x32, 0x57, 0x1b, 0xa4, 0xa3, 0xe3, 0x7e, 0x47, 0x90,
|
||||
0x8f, 0xf0, 0xa2, 0x01, 0x98, 0xa7, 0xed, 0x1d, 0x89, 0x9c, 0x8e, 0xbd, 0x67, 0xde, 0xd2, 0xfe,
|
||||
0x48, 0xbf, 0x72, 0xf2, 0x09, 0x96, 0xda, 0xe0, 0x41, 0xa8, 0xda, 0x76, 0xf7, 0x98, 0x5a, 0xc1,
|
||||
0xe9, 0x33, 0x6f, 0x26, 0x9d, 0x76, 0x3c, 0xfc, 0x4e, 0x70, 0x42, 0x61, 0xa2, 0x59, 0x9e, 0x0b,
|
||||
0xc9, 0xe9, 0xc4, 0x9b, 0x3a, 0xf8, 0x65, 0x03, 0xa1, 0xf5, 0x4f, 0x23, 0x95, 0x4a, 0x66, 0x48,
|
||||
0xde, 0x9e, 0x7f, 0xc4, 0xf1, 0x25, 0x25, 0x68, 0xeb, 0xd2, 0xd1, 0xdb, 0x6f, 0x51, 0xb0, 0x0a,
|
||||
0x93, 0x59, 0xeb, 0xfe, 0xdb, 0x98, 0x1f, 0x02, 0x00, 0x00, 0xff, 0xff, 0x3c, 0x2e, 0xc6, 0x75,
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||||
0x93, 0x02, 0x00, 0x00,
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}
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|
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@ -31,4 +31,6 @@ message DecryptedGroupMessage {
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required bytes signature = 4;
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required bytes signed_group_id = 5;
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required bytes previous_message_sig =6;
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||||
// Used to prevent analysis on text length, length is 1024 - len(text)
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required bytes padding = 7;
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}
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@ -79,6 +79,12 @@ func (sg *Guard) ValidateChallenge(message []byte, spamguard []byte) bool {
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if len(spamguard) != 24 {
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return false
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}
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||||
// If the message is too large just throw it away.
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if len(message) > 2048 {
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return false
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}
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solve := make([]byte, len(sg.nonce)+len(message)+len(spamguard))
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copy(solve[0:], sg.nonce[:])
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copy(solve[len(sg.nonce):], message[:])
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