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Actually implementing correct signature construction

pull/62/head
Sarah Jamie Lewis 3 years ago
parent
1ea1521fee
commit
22aebae0e5
14 changed files with 98 additions and 92 deletions
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  1. 4
      model/group.go
  2. 1
      model/group_test.go
  3. 46
      model/message_test.go
  4. 28
      model/profile.go
  5. 14
      model/profile_test.go
  6. 4
      peer/connections/peerserverconnection_test.go
  7. 5
      peer/cwtch_peer.go
  8. 2
      peer/fetch/peer_fetch_channel_test.go
  9. 2
      peer/listen/peer_listen_channel_test.go
  10. 71
      protocol/group_message.pb.go
  11. 8
      protocol/group_message.proto
  12. 1
      server/listen/server_listen_channel_test.go
  13. 2
      server/send/server_send_channel_test.go
  14. 2
      testing/cwtch_peer_server_intergration_test.go

4
model/group.go
View File

@ -80,13 +80,13 @@ func (g *Group) Invite() ([]byte, error) {
}
// AddMessage takes a DecryptedGroupMessage and adds it to the Groups Timeline
func (g *Group) AddMessage(message *protocol.DecryptedGroupMessage, verified bool) *Message {
func (g *Group) AddMessage(message *protocol.DecryptedGroupMessage, sig []byte, verified bool) *Message {
g.lock.Lock()
timelineMessage := &Message{
Message: message.GetText(),
Timestamp: time.Unix(int64(message.GetTimestamp()), 0),
Received: time.Now(),
Signature: message.GetSignature(),
Signature: sig,
Verified: verified,
PeerID: message.GetOnion(),
PreviousMessageSig: message.GetPreviousMessageSig(),

1
model/group_test.go
View File

@ -14,7 +14,6 @@ func TestGroup(t *testing.T) {
Text: proto.String("Hello World!"),
Timestamp: proto.Int32(int32(time.Now().Unix())),
SignedGroupId: []byte{},
Signature: []byte{},
PreviousMessageSig: []byte{},
Padding: []byte{},
}

46
model/message_test.go
View File

@ -23,21 +23,21 @@ func TestMessagePadding(t *testing.T) {
group := alice.GetGroupByGroupID(gid)
c1, _ := sarah.EncryptMessageToGroup("Hello World 1", group.GroupID)
c1, s1, _ := sarah.EncryptMessageToGroup("Hello World 1", group.GroupID)
t.Logf("Length of Encrypted Message: %v", len(c1))
alice.AttemptDecryption(c1)
alice.AttemptDecryption(c1, s1)
c2, _ := alice.EncryptMessageToGroup("Hello World 2", group.GroupID)
c2, s2, _ := alice.EncryptMessageToGroup("Hello World 2", group.GroupID)
t.Logf("Length of Encrypted Message: %v", len(c2))
alice.AttemptDecryption(c2)
alice.AttemptDecryption(c2, s2)
c3, _ := alice.EncryptMessageToGroup("Hello World 3", group.GroupID)
c3, s3, _ := alice.EncryptMessageToGroup("Hello World 3", group.GroupID)
t.Logf("Length of Encrypted Message: %v", len(c3))
alice.AttemptDecryption(c3)
alice.AttemptDecryption(c3, s3)
c4, _ := alice.EncryptMessageToGroup("Hello World this is a much longer message 3", group.GroupID)
c4, s4, _ := alice.EncryptMessageToGroup("Hello World this is a much longer message 3", group.GroupID)
t.Logf("Length of Encrypted Message: %v", len(c4))
alice.AttemptDecryption(c4)
alice.AttemptDecryption(c4, s4)
}
@ -59,33 +59,33 @@ func TestTranscriptConsistency(t *testing.T) {
t.Logf("group: %v, sarah %v", group, sarah)
c1, _ := alice.EncryptMessageToGroup("Hello World 1", group.GroupID)
c1, s1, _ := alice.EncryptMessageToGroup("Hello World 1", group.GroupID)
t.Logf("Length of Encrypted Message: %v", len(c1))
alice.AttemptDecryption(c1)
alice.AttemptDecryption(c1, s1)
c2, _ := alice.EncryptMessageToGroup("Hello World 2", group.GroupID)
c2, s2, _ := alice.EncryptMessageToGroup("Hello World 2", group.GroupID)
t.Logf("Length of Encrypted Message: %v", len(c2))
alice.AttemptDecryption(c2)
alice.AttemptDecryption(c2, s2)
c3, _ := alice.EncryptMessageToGroup("Hello World 3", group.GroupID)
c3, s3, _ := alice.EncryptMessageToGroup("Hello World 3", group.GroupID)
t.Logf("Length of Encrypted Message: %v", len(c3))
alice.AttemptDecryption(c3)
alice.AttemptDecryption(c3, s3)
time.Sleep(time.Second * 1)
c4, _ := alice.EncryptMessageToGroup("Hello World 4", group.GroupID)
c4, s4, _ := alice.EncryptMessageToGroup("Hello World 4", group.GroupID)
t.Logf("Length of Encrypted Message: %v", len(c4))
alice.AttemptDecryption(c4)
alice.AttemptDecryption(c4, s4)
c5, _ := alice.EncryptMessageToGroup("Hello World 5", group.GroupID)
c5, s5, _ := alice.EncryptMessageToGroup("Hello World 5", group.GroupID)
t.Logf("Length of Encrypted Message: %v", len(c5))
_, m1 := sarah.AttemptDecryption(c1)
sarah.AttemptDecryption(c1) // Try a duplicate
_, m2 := sarah.AttemptDecryption(c2)
_, m3 := sarah.AttemptDecryption(c3)
_, m4 := sarah.AttemptDecryption(c4)
_, m5 := sarah.AttemptDecryption(c5)
_, m1 := sarah.AttemptDecryption(c1, s1)
sarah.AttemptDecryption(c1, s1) // Try a duplicate
_, m2 := sarah.AttemptDecryption(c2, s2)
_, m3 := sarah.AttemptDecryption(c3, s3)
_, m4 := sarah.AttemptDecryption(c4, s4)
_, m5 := sarah.AttemptDecryption(c5, s5)
// Now we simulate a client receiving these messages completely out of order
timeline.Insert(m1)

28
model/profile.go
View File

@ -10,7 +10,6 @@ import (
"git.openprivacy.ca/openprivacy/libricochet-go/utils"
"golang.org/x/crypto/ed25519"
"io"
"strconv"
"sync"
"time"
)
@ -171,16 +170,21 @@ func (p *Profile) GetContact(onion string) (*PublicProfile, bool) {
}
// VerifyGroupMessage confirms the authenticity of a message given an onion, message and signature.
func (p *Profile) VerifyGroupMessage(onion string, groupID string, message string, timestamp int32, signature []byte) bool {
func (p *Profile) VerifyGroupMessage(onion string, groupID string, message string, timestamp int32, ciphertext []byte, signature []byte) bool {
group := p.GetGroupByGroupID(groupID)
if group == nil {
return false
}
if onion == p.Onion {
m := message + groupID + strconv.Itoa(int(timestamp))
m := groupID + group.GroupServer + string(ciphertext)
return ed25519.Verify(p.Ed25519PublicKey, []byte(m), signature)
}
contact, found := p.GetContact(onion)
if found {
m := message + groupID + strconv.Itoa(int(timestamp))
m := groupID + group.GroupServer + string(ciphertext)
return ed25519.Verify(contact.Ed25519PublicKey, []byte(m), signature)
}
return false
@ -250,7 +254,7 @@ func (p *Profile) AddGroup(group *Group) {
}
// AttemptDecryption takes a ciphertext and signature and attempts to decrypt it under known groups.
func (p *Profile) AttemptDecryption(ciphertext []byte) (bool, *Message) {
func (p *Profile) AttemptDecryption(ciphertext []byte, signature []byte) (bool, *Message) {
for _, group := range p.Groups {
success, dgm := group.DecryptMessage(ciphertext)
if success {
@ -269,8 +273,8 @@ func (p *Profile) AttemptDecryption(ciphertext []byte) (bool, *Message) {
}
}
verified := p.VerifyGroupMessage(dgm.GetOnion(), group.GroupID, dgm.GetText(), dgm.GetTimestamp(), dgm.GetSignature())
return true, group.AddMessage(dgm, verified)
verified := p.VerifyGroupMessage(dgm.GetOnion(), group.GroupID, dgm.GetText(), dgm.GetTimestamp(), ciphertext, signature)
return true, group.AddMessage(dgm, signature, verified)
}
}
return false, nil
@ -284,11 +288,11 @@ func getRandomness(arr *[]byte) {
// EncryptMessageToGroup when given a message and a group, encrypts and signs the message under the group and
// profile
func (p *Profile) EncryptMessageToGroup(message string, groupID string) ([]byte, error) {
func (p *Profile) EncryptMessageToGroup(message string, groupID string) ([]byte, []byte, error) {
group := p.GetGroupByGroupID(groupID)
if group != nil {
timestamp := time.Now().Unix()
signature := p.SignMessage(message + groupID + strconv.Itoa(int(timestamp)))
var prevSig []byte
if len(group.Timeline.Messages) > 0 {
prevSig = group.Timeline.Messages[len(group.Timeline.Messages)-1].Signature
@ -305,12 +309,12 @@ func (p *Profile) EncryptMessageToGroup(message string, groupID string) ([]byte,
Text: proto.String(message),
SignedGroupId: group.SignedGroupID[:],
Timestamp: proto.Int32(int32(timestamp)),
Signature: signature,
PreviousMessageSig: prevSig,
Padding: padding[:],
}
ciphertext := group.EncryptMessage(dm)
return ciphertext, nil
signature := p.SignMessage(groupID + group.GroupServer + string(ciphertext))
return ciphertext, signature, nil
}
return nil, errors.New("group does not exist")
return nil, nil, errors.New("group does not exist")
}

14
model/profile_test.go
View File

@ -104,29 +104,29 @@ func TestProfileGroup(t *testing.T) {
group := alice.GetGroupByGroupID(gid)
sarah.AcceptInvite(group.GroupID)
c, _ := sarah.EncryptMessageToGroup("Hello World", group.GroupID)
alice.AttemptDecryption(c)
c, s1, _ := sarah.EncryptMessageToGroup("Hello World", group.GroupID)
alice.AttemptDecryption(c, s1)
gid2, invite2, _ := alice.StartGroup("bbb.onion")
gci2 := &protocol.CwtchPeerPacket{}
proto.Unmarshal(invite2, gci2)
sarah.ProcessInvite(gci2.GetGroupChatInvite(), alice.Onion)
group2 := alice.GetGroupByGroupID(gid2)
c2, _ := sarah.EncryptMessageToGroup("Hello World", group2.GroupID)
alice.AttemptDecryption(c2)
c2, s2, _ := sarah.EncryptMessageToGroup("Hello World", group2.GroupID)
alice.AttemptDecryption(c2, s2)
bob := GenerateNewProfile("bob")
bob.AddContact(alice.Onion, &alice.PublicProfile)
bob.ProcessInvite(gci2.GetGroupChatInvite(), alice.Onion)
c3, err := bob.EncryptMessageToGroup("Bobs Message", group2.GroupID)
c3, s3, err := bob.EncryptMessageToGroup("Bobs Message", group2.GroupID)
if err == nil {
ok, message := alice.AttemptDecryption(c3)
ok, message := alice.AttemptDecryption(c3, s3)
if ok != true || message.Verified == true {
t.Errorf("Bobs message to the group should be decrypted but not verified by alice instead %v %v", message, ok)
}
eve := GenerateNewProfile("eve")
ok, _ = eve.AttemptDecryption(c3)
ok, _ = eve.AttemptDecryption(c3, s3)
if ok {
t.Errorf("Eves hould not be able to decrypt messages!")
}

4
peer/connections/peerserverconnection_test.go
View File

@ -29,7 +29,7 @@ func (ts *TestServer) HandleGroupMessage(gm *protocol.GroupMessage) {
}
func (ts *TestServer) HandleFetchRequest() []*protocol.GroupMessage {
return []*protocol.GroupMessage{{Ciphertext: []byte("hello"), Spamguard: []byte{}}, {Ciphertext: []byte("hello"), Spamguard: []byte{}}}
return []*protocol.GroupMessage{{Ciphertext: []byte("hello"), Signature: []byte{}, Spamguard: []byte{}}, {Ciphertext: []byte("hello"), Signature: []byte{}, Spamguard: []byte{}}}
}
func runtestserver(t *testing.T, ts *TestServer, privateKey *rsa.PrivateKey) {
@ -92,7 +92,7 @@ func TestPeerServerConnection(t *testing.T) {
t.Errorf("connection should now be authed(%v), instead was %v", AUTHENTICATED, state)
}
gm := &protocol.GroupMessage{Ciphertext: []byte("hello")}
gm := &protocol.GroupMessage{Ciphertext: []byte("hello"), Signature: []byte{}}
psc.SendGroupMessage(gm)
time.Sleep(time.Second * 2)
if ts.Received == false {

5
peer/cwtch_peer.go
View File

@ -214,7 +214,7 @@ func (cp *cwtchPeer) InviteOnionToGroup(onion string, groupid string) error {
// ReceiveGroupMessage is a callback function that processes GroupMessages from a given server
func (cp *cwtchPeer) ReceiveGroupMessage(server string, gm *protocol.GroupMessage) {
cp.Profile.AttemptDecryption(gm.Ciphertext)
cp.Profile.AttemptDecryption(gm.Ciphertext, gm.Signature)
}
// JoinServer manages a new server connection with the given onion address
@ -232,12 +232,13 @@ func (cp *cwtchPeer) SendMessageToGroup(groupid string, message string) error {
if psc == nil {
return errors.New("could not find server connection to send message to")
}
ct, err := cp.Profile.EncryptMessageToGroup(message, groupid)
ct, sig, err := cp.Profile.EncryptMessageToGroup(message, groupid)
if err != nil {
return err
}
gm := &protocol.GroupMessage{
Ciphertext: ct,
Signature: sig,
}
err = psc.SendGroupMessage(gm)
return err

2
peer/fetch/peer_fetch_channel_test.go
View File

@ -74,7 +74,7 @@ func TestPeerFetchChannel(t *testing.T) {
csp := &protocol.CwtchServerPacket{
GroupMessage: &protocol.GroupMessage{
Ciphertext: []byte("hello"), Spamguard: []byte{},
Ciphertext: []byte("hello"), Signature: []byte{}, Spamguard: []byte{},
},
}
packet, _ := proto.Marshal(csp)

2
peer/listen/peer_listen_channel_test.go
View File

@ -71,7 +71,7 @@ func TestPeerListenChannel(t *testing.T) {
}
csp := &protocol.CwtchServerPacket{
GroupMessage: &protocol.GroupMessage{Ciphertext: []byte("hello"), Spamguard: []byte{}},
GroupMessage: &protocol.GroupMessage{Ciphertext: []byte("hello"), Signature: []byte{}, Spamguard: []byte{}},
}
packet, _ := proto.Marshal(csp)

71
protocol/group_message.pb.go
View File

@ -50,6 +50,7 @@ func (*FetchMessage) Descriptor() ([]byte, []int) { return fileDescriptor2, []in
type GroupMessage struct {
Ciphertext []byte `protobuf:"bytes,1,req,name=ciphertext" json:"ciphertext,omitempty"`
Spamguard []byte `protobuf:"bytes,2,req,name=spamguard" json:"spamguard,omitempty"`
Signature []byte `protobuf:"bytes,3,req,name=signature" json:"signature,omitempty"`
XXX_unrecognized []byte `json:"-"`
}
@ -72,6 +73,13 @@ func (m *GroupMessage) GetSpamguard() []byte {
return nil
}
func (m *GroupMessage) GetSignature() []byte {
if m != nil {
return m.Signature
}
return nil
}
// DecryptedGroupMessage is *never* sent in the clear on the wire
// and is only ever sent when encrypted in the ciphertext parameter of
// GroupMessage
@ -79,11 +87,10 @@ type DecryptedGroupMessage struct {
Onion *string `protobuf:"bytes,1,req,name=onion" json:"onion,omitempty"`
Timestamp *int32 `protobuf:"varint,2,req,name=timestamp" json:"timestamp,omitempty"`
Text *string `protobuf:"bytes,3,req,name=text" json:"text,omitempty"`
Signature []byte `protobuf:"bytes,4,req,name=signature" json:"signature,omitempty"`
SignedGroupId []byte `protobuf:"bytes,5,req,name=signed_group_id,json=signedGroupId" json:"signed_group_id,omitempty"`
PreviousMessageSig []byte `protobuf:"bytes,6,req,name=previous_message_sig,json=previousMessageSig" json:"previous_message_sig,omitempty"`
SignedGroupId []byte `protobuf:"bytes,4,req,name=signed_group_id,json=signedGroupId" json:"signed_group_id,omitempty"`
PreviousMessageSig []byte `protobuf:"bytes,5,req,name=previous_message_sig,json=previousMessageSig" json:"previous_message_sig,omitempty"`
// Used to prevent analysis on text length, length is 1024 - len(text)
Padding []byte `protobuf:"bytes,7,req,name=padding" json:"padding,omitempty"`
Padding []byte `protobuf:"bytes,6,req,name=padding" json:"padding,omitempty"`
XXX_unrecognized []byte `json:"-"`
}
@ -113,13 +120,6 @@ func (m *DecryptedGroupMessage) GetText() string {
return ""
}
func (m *DecryptedGroupMessage) GetSignature() []byte {
if m != nil {
return m.Signature
}
return nil
}
func (m *DecryptedGroupMessage) GetSignedGroupId() []byte {
if m != nil {
return m.SignedGroupId
@ -161,29 +161,28 @@ func init() {
func init() { proto.RegisterFile("group_message.proto", fileDescriptor2) }
var fileDescriptor2 = []byte{
// 372 bytes of a gzipped FileDescriptorProto
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// 360 bytes of a gzipped FileDescriptorProto
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0x5c, 0x65, 0x90, 0xf6, 0x77, 0xb4, 0x15, 0xa2, 0xb7, 0x00, 0x7e, 0x5e, 0x60, 0x6a, 0x9e, 0xb5,
0xc3, 0xec, 0x28, 0x75, 0x0a, 0x43, 0x25, 0x85, 0x92, 0x3e, 0x70, 0x14, 0x37, 0x45, 0x3d, 0xcd,
0x89, 0x12, 0xad, 0x63, 0xa5, 0xf6, 0x59, 0xc3, 0xf8, 0x20, 0x10, 0x02, 0x03, 0xbf, 0x63, 0xdf,
0x5b, 0xfc, 0x3f, 0xf9, 0x0f, 0xdf, 0xea, 0x38, 0xcc, 0x92, 0xe6, 0x78, 0x45, 0x46, 0x07, 0x7e,
0x8b, 0x49, 0x23, 0xfb, 0xd0, 0xeb, 0x8c, 0x9c, 0xc0, 0x54, 0x1b, 0xdc, 0x0a, 0x55, 0xd9, 0xf6,
0x14, 0x13, 0x2b, 0x38, 0x1d, 0xfa, 0x66, 0xd2, 0xb2, 0xdd, 0x7a, 0x6b, 0xc1, 0x09, 0x85, 0xcf,
0x9a, 0x65, 0x99, 0x90, 0x9c, 0x7e, 0xf2, 0x4d, 0x6d, 0x79, 0xb6, 0x84, 0xd0, 0xfa, 0xbb, 0x4d,
0xa4, 0x92, 0x29, 0x92, 0xdf, 0x87, 0x7b, 0xd8, 0x3d, 0x85, 0x18, 0x6d, 0x55, 0x38, 0xfa, 0x72,
0x3e, 0x0b, 0xe6, 0x61, 0x3c, 0x6e, 0xba, 0x6f, 0xeb, 0xe6, 0xf7, 0x00, 0x00, 0x00, 0xff, 0xff,
0x33, 0x30, 0xca, 0x8b, 0x54, 0x02, 0x00, 0x00,
}

8
protocol/group_message.proto
View File

@ -18,6 +18,7 @@ message FetchMessage {
message GroupMessage {
required bytes ciphertext = 1;
required bytes spamguard = 2;
required bytes signature = 3;
}
// DecryptedGroupMessage is *never* sent in the clear on the wire
@ -27,9 +28,8 @@ message DecryptedGroupMessage {
required string onion = 1;
required int32 timestamp = 2;
required string text = 3;
required bytes signature = 4;
required bytes signed_group_id = 5;
required bytes previous_message_sig =6;
required bytes signed_group_id = 4;
required bytes previous_message_sig =5;
// Used to prevent analysis on text length, length is 1024 - len(text)
required bytes padding = 7;
required bytes padding = 6;
}

1
server/listen/server_listen_channel_test.go
View File

@ -69,6 +69,7 @@ func TestServerListenChannel(t *testing.T) {
if control.GetChannelResult() != nil {
gm := &protocol.GroupMessage{
Ciphertext: []byte("Hello"),
Signature: []byte{},
Spamguard: []byte{},
}
cslc.SendGroupMessage(gm)

2
server/send/server_send_channel_test.go
View File

@ -86,6 +86,7 @@ func TestServerSendChannel(t *testing.T) {
gm := &protocol.GroupMessage{
Ciphertext: []byte("Hello"),
Signature: []byte{},
Spamguard: sgsolve,
}
@ -147,6 +148,7 @@ func TestServerSendChannelNoSpamGuard(t *testing.T) {
gm := &protocol.GroupMessage{
Ciphertext: []byte("hello"),
Signature: []byte{},
Spamguard: sgsolve,
}

2
testing/cwtch_peer_server_intergration_test.go
View File

@ -182,7 +182,7 @@ func TestCwtchPeerIntegration(t *testing.T) {
bob.JoinServer(serverAddr)
fmt.Println("Waiting for peerings and server joins...")
time.Sleep(time.Second * 60)
time.Sleep(time.Second * 120)
fmt.Println("Alice inviting Bob to group...")
err = alice.InviteOnionToGroup(bob.GetProfile().Onion, groupID)

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