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0.3.6 - announce packet creation

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This commit is contained in:
Sudo-Ivan
2025-01-02 14:10:31 -06:00
parent d79406e354
commit ea8daf6bb2
3 changed files with 52 additions and 76 deletions
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102
pkg/announce/announce.go
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@@ -1,7 +1,6 @@
package announce
import (
"crypto/ed25519"
"crypto/rand"
"crypto/sha256"
"encoding/binary"
@@ -170,73 +169,43 @@ func (a *Announce) HandleAnnounce(data []byte) error {
log.Printf("[DEBUG-7] Handling announce packet of %d bytes", len(data))
// Minimum packet size validation (2 header + 16 hash + 32 pubkey + 1 hops + 2 appdata len + 64 sig)
if len(data) < 117 {
// Minimum packet size validation (header(2) + desthash(16) + enckey(32) + signkey(32) + namehash(10) +
// randomhash(10) + signature(64) + min app data(3))
if len(data) < 169 {
log.Printf("[DEBUG-7] Invalid announce data length: %d bytes", len(data))
return errors.New("invalid announce data length")
}
// Parse header
// Parse fields
header := data[:2]
hopCount := header[1]
log.Printf("[DEBUG-7] Announce header: type=%x, hops=%d", header[0], hopCount)
destHash := data[2:18]
encKey := data[18:50]
signKey := data[50:82]
nameHash := data[82:92]
randomHash := data[92:102]
signature := data[102:166]
appData := data[166:]
log.Printf("[DEBUG-7] Announce fields: destHash=%x, encKey=%x, signKey=%x",
destHash, encKey, signKey)
log.Printf("[DEBUG-7] Name hash=%x, random hash=%x", nameHash, randomHash)
// Validate hop count
if hopCount > MAX_HOPS {
log.Printf("[DEBUG-7] Announce exceeded max hops: %d", hopCount)
return errors.New("announce exceeded maximum hop count")
}
// Extract fields with detailed logging
destHash := data[2:18]
publicKey := data[18:50]
hopsByte := data[50]
log.Printf("[DEBUG-7] Announce fields: destHash=%x, pubKeyLen=%d, hops=%d",
destHash, len(publicKey), hopsByte)
// Validate hop count matches header
if hopsByte != hopCount {
return errors.New("inconsistent hop count in packet")
}
// Extract app data length and content
appDataLen := binary.BigEndian.Uint16(data[51:53])
appDataEnd := 53 + int(appDataLen)
if appDataEnd > len(data) {
return errors.New("invalid app data length")
}
appData := data[53:appDataEnd]
// Handle ratchet ID if present
var ratchetID []byte
signatureStart := appDataEnd
remainingBytes := len(data) - appDataEnd
if remainingBytes > ed25519.SignatureSize {
ratchetID = data[appDataEnd : len(data)-ed25519.SignatureSize]
signatureStart = len(data) - ed25519.SignatureSize
}
if signatureStart+ed25519.SignatureSize > len(data) {
return errors.New("invalid signature position")
}
signature := data[signatureStart:]
// Create announced identity
announcedIdentity := identity.FromPublicKey(publicKey)
// Create announced identity from public keys
pubKey := append(encKey, signKey...)
announcedIdentity := identity.FromPublicKey(pubKey)
if announcedIdentity == nil {
return errors.New("invalid identity public key")
}
// Verify signature
signData := append(destHash, appData...)
if ratchetID != nil {
signData = append(signData, ratchetID...)
}
if !announcedIdentity.Verify(signData, signature) {
return errors.New("invalid announce signature")
}
@@ -287,13 +256,14 @@ func CreateHeader(ifacFlag byte, headerType byte, contextFlag byte, propType byt
func (a *Announce) CreatePacket() []byte {
log.Printf("[DEBUG-7] Creating announce packet")
// Create header byte
headerByte := byte(
(IFAC_NONE) |
(HEADER_TYPE_1 << 6) |
(0 << 5) |
(PROP_TYPE_BROADCAST << 4) |
(DEST_TYPE_SINGLE << 2) |
PACKET_TYPE_ANNOUNCE,
(IFAC_NONE) | // No interface auth
(HEADER_TYPE_1 << 6) | // Single address field
(0 << 5) | // No context
(PROP_TYPE_BROADCAST << 4) | // Broadcast propagation
(DEST_TYPE_SINGLE << 2) | // Single destination
PACKET_TYPE_ANNOUNCE, // Announce packet type
)
log.Printf("[DEBUG-7] Created header byte: %02x, hops: %d", headerByte, a.hops)
@@ -316,12 +286,12 @@ func (a *Announce) CreatePacket() []byte {
log.Printf("[DEBUG-7] Adding signing key (32 bytes): %x", signKey)
packet = append(packet, signKey...)
// Add name hash (10 bytes) - SHA256 hash of full name truncated to 10 bytes
// Add name hash (10 bytes)
nameHash := sha256.Sum256([]byte(fmt.Sprintf("%s.%s", a.config.AppName, a.config.AppAspect)))
log.Printf("[DEBUG-7] Adding name hash (10 bytes): %x", nameHash[:10])
packet = append(packet, nameHash[:10]...)
// Add random hash (5 random + 5 timestamp bytes = 10 bytes)
// Add random hash (10 bytes: 5 random + 5 timestamp)
randomBytes := make([]byte, 5)
rand.Read(randomBytes)
timeBytes := make([]byte, 8)
@@ -330,7 +300,7 @@ func (a *Announce) CreatePacket() []byte {
packet = append(packet, randomBytes...)
packet = append(packet, timeBytes[:5]...)
// Add ratchet if present (32 bytes)
// Add ratchet ID if present (32 bytes)
if a.ratchetID != nil {
log.Printf("[DEBUG-7] Adding ratchet ID (32 bytes): %x", a.ratchetID)
packet = append(packet, a.ratchetID...)
@@ -338,20 +308,17 @@ func (a *Announce) CreatePacket() []byte {
// Create msgpack array for app data
appData := []byte{
0x92, // msgpack array of 2 elements
0xc4, // bin 8 format for byte array
0x92, // msgpack array of 2 elements
0xc4, // bin 8 format for byte array
}
// Add name bytes
nameBytes := []byte(fmt.Sprintf("%s.%s", a.config.AppName, a.config.AppAspect))
appData = append(appData, byte(len(nameBytes))) // length prefix
appData = append(appData, nameBytes...) // name bytes
appData = append(appData, 0x00) // ticket value = 0
// Add app data to packet
packet = append(packet, appData...)
// Create signature
// Create signature over destination hash and app data
signData := append(a.destinationHash, appData...)
if a.ratchetID != nil {
signData = append(signData, a.ratchetID...)
@@ -360,6 +327,9 @@ func (a *Announce) CreatePacket() []byte {
log.Printf("[DEBUG-7] Adding signature (64 bytes): %x", signature)
packet = append(packet, signature...)
// Finally add the app data
packet = append(packet, appData...)
log.Printf("[DEBUG-7] Final packet size: %d bytes", len(packet))
return packet
}