summaryrefslogtreecommitdiffhomepage
path: root/src/cookie.go
diff options
context:
space:
mode:
authorMathias Hall-Andersen <mathias@hall-andersen.dk>2018-02-04 16:08:26 +0100
committerMathias Hall-Andersen <mathias@hall-andersen.dk>2018-02-04 16:08:26 +0100
commita0f54cbe5ac2cd8b8296c2c57c30029dd349cff0 (patch)
tree64574090d79ff3899c5c18e5268e450028e4656b /src/cookie.go
parent5871ec04deb8f4715cab37146940baa35c08cbee (diff)
Align with go library layout
Diffstat (limited to 'src/cookie.go')
-rw-r--r--src/cookie.go252
1 files changed, 0 insertions, 252 deletions
diff --git a/src/cookie.go b/src/cookie.go
deleted file mode 100644
index a13ad49..0000000
--- a/src/cookie.go
+++ /dev/null
@@ -1,252 +0,0 @@
-package main
-
-import (
- "crypto/hmac"
- "crypto/rand"
- "golang.org/x/crypto/blake2s"
- "golang.org/x/crypto/chacha20poly1305"
- "sync"
- "time"
-)
-
-type CookieChecker struct {
- mutex sync.RWMutex
- mac1 struct {
- key [blake2s.Size]byte
- }
- mac2 struct {
- secret [blake2s.Size]byte
- secretSet time.Time
- encryptionKey [chacha20poly1305.KeySize]byte
- }
-}
-
-type CookieGenerator struct {
- mutex sync.RWMutex
- mac1 struct {
- key [blake2s.Size]byte
- }
- mac2 struct {
- cookie [blake2s.Size128]byte
- cookieSet time.Time
- hasLastMAC1 bool
- lastMAC1 [blake2s.Size128]byte
- encryptionKey [chacha20poly1305.KeySize]byte
- }
-}
-
-func (st *CookieChecker) Init(pk NoisePublicKey) {
- st.mutex.Lock()
- defer st.mutex.Unlock()
-
- // mac1 state
-
- func() {
- hsh, _ := blake2s.New256(nil)
- hsh.Write([]byte(WGLabelMAC1))
- hsh.Write(pk[:])
- hsh.Sum(st.mac1.key[:0])
- }()
-
- // mac2 state
-
- func() {
- hsh, _ := blake2s.New256(nil)
- hsh.Write([]byte(WGLabelCookie))
- hsh.Write(pk[:])
- hsh.Sum(st.mac2.encryptionKey[:0])
- }()
-
- st.mac2.secretSet = time.Time{}
-}
-
-func (st *CookieChecker) CheckMAC1(msg []byte) bool {
- size := len(msg)
- smac2 := size - blake2s.Size128
- smac1 := smac2 - blake2s.Size128
-
- var mac1 [blake2s.Size128]byte
-
- mac, _ := blake2s.New128(st.mac1.key[:])
- mac.Write(msg[:smac1])
- mac.Sum(mac1[:0])
-
- return hmac.Equal(mac1[:], msg[smac1:smac2])
-}
-
-func (st *CookieChecker) CheckMAC2(msg []byte, src []byte) bool {
- st.mutex.RLock()
- defer st.mutex.RUnlock()
-
- if time.Now().Sub(st.mac2.secretSet) > CookieRefreshTime {
- return false
- }
-
- // derive cookie key
-
- var cookie [blake2s.Size128]byte
- func() {
- mac, _ := blake2s.New128(st.mac2.secret[:])
- mac.Write(src)
- mac.Sum(cookie[:0])
- }()
-
- // calculate mac of packet (including mac1)
-
- smac2 := len(msg) - blake2s.Size128
-
- var mac2 [blake2s.Size128]byte
- func() {
- mac, _ := blake2s.New128(cookie[:])
- mac.Write(msg[:smac2])
- mac.Sum(mac2[:0])
- }()
-
- return hmac.Equal(mac2[:], msg[smac2:])
-}
-
-func (st *CookieChecker) CreateReply(
- msg []byte,
- recv uint32,
- src []byte,
-) (*MessageCookieReply, error) {
-
- st.mutex.RLock()
-
- // refresh cookie secret
-
- if time.Now().Sub(st.mac2.secretSet) > CookieRefreshTime {
- st.mutex.RUnlock()
- st.mutex.Lock()
- _, err := rand.Read(st.mac2.secret[:])
- if err != nil {
- st.mutex.Unlock()
- return nil, err
- }
- st.mac2.secretSet = time.Now()
- st.mutex.Unlock()
- st.mutex.RLock()
- }
-
- // derive cookie
-
- var cookie [blake2s.Size128]byte
- func() {
- mac, _ := blake2s.New128(st.mac2.secret[:])
- mac.Write(src)
- mac.Sum(cookie[:0])
- }()
-
- // encrypt cookie
-
- size := len(msg)
-
- smac2 := size - blake2s.Size128
- smac1 := smac2 - blake2s.Size128
-
- reply := new(MessageCookieReply)
- reply.Type = MessageCookieReplyType
- reply.Receiver = recv
-
- _, err := rand.Read(reply.Nonce[:])
- if err != nil {
- st.mutex.RUnlock()
- return nil, err
- }
-
- XChaCha20Poly1305Encrypt(
- reply.Cookie[:0],
- &reply.Nonce,
- cookie[:],
- msg[smac1:smac2],
- &st.mac2.encryptionKey,
- )
-
- st.mutex.RUnlock()
-
- return reply, nil
-}
-
-func (st *CookieGenerator) Init(pk NoisePublicKey) {
- st.mutex.Lock()
- defer st.mutex.Unlock()
-
- func() {
- hsh, _ := blake2s.New256(nil)
- hsh.Write([]byte(WGLabelMAC1))
- hsh.Write(pk[:])
- hsh.Sum(st.mac1.key[:0])
- }()
-
- func() {
- hsh, _ := blake2s.New256(nil)
- hsh.Write([]byte(WGLabelCookie))
- hsh.Write(pk[:])
- hsh.Sum(st.mac2.encryptionKey[:0])
- }()
-
- st.mac2.cookieSet = time.Time{}
-}
-
-func (st *CookieGenerator) ConsumeReply(msg *MessageCookieReply) bool {
- st.mutex.Lock()
- defer st.mutex.Unlock()
-
- if !st.mac2.hasLastMAC1 {
- return false
- }
-
- var cookie [blake2s.Size128]byte
-
- _, err := XChaCha20Poly1305Decrypt(
- cookie[:0],
- &msg.Nonce,
- msg.Cookie[:],
- st.mac2.lastMAC1[:],
- &st.mac2.encryptionKey,
- )
-
- if err != nil {
- return false
- }
-
- st.mac2.cookieSet = time.Now()
- st.mac2.cookie = cookie
- return true
-}
-
-func (st *CookieGenerator) AddMacs(msg []byte) {
-
- size := len(msg)
-
- smac2 := size - blake2s.Size128
- smac1 := smac2 - blake2s.Size128
-
- mac1 := msg[smac1:smac2]
- mac2 := msg[smac2:]
-
- st.mutex.Lock()
- defer st.mutex.Unlock()
-
- // set mac1
-
- func() {
- mac, _ := blake2s.New128(st.mac1.key[:])
- mac.Write(msg[:smac1])
- mac.Sum(mac1[:0])
- }()
- copy(st.mac2.lastMAC1[:], mac1)
- st.mac2.hasLastMAC1 = true
-
- // set mac2
-
- if time.Now().Sub(st.mac2.cookieSet) > CookieRefreshTime {
- return
- }
-
- func() {
- mac, _ := blake2s.New128(st.mac2.cookie[:])
- mac.Write(msg[:smac2])
- mac.Sum(mac2[:0])
- }()
-}