all: move wgcfg from wireguard-go
This is mostly code movement from the wireguard-go repo.
Most of the new wgcfg package corresponds to the wireguard-go wgcfg package.
wgengine/wgcfg/device{_test}.go was device/config{_test}.go.
There were substantive but simple changes to device_test.go to remove
internal package device references.
The API of device.Config (now wgcfg.DeviceConfig) grew an error return;
we previously logged the error and threw it away.
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
This commit is contained in:
Josh Bleecher Snyder
committed by
Josh Bleecher Snyder
Josh Bleecher Snyder
parent
0bc73f8e4f
commit
fe7c3e9c17
@@ -0,0 +1,240 @@
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// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package wgcfg
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import (
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"bytes"
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"crypto/rand"
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"crypto/subtle"
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"encoding/base64"
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"encoding/hex"
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"errors"
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"fmt"
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"strings"
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"golang.org/x/crypto/chacha20poly1305"
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"golang.org/x/crypto/curve25519"
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)
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const KeySize = 32
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// Key is curve25519 key.
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// It is used by WireGuard to represent public and preshared keys.
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type Key [KeySize]byte
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// NewPresharedKey generates a new random key.
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func NewPresharedKey() (*Key, error) {
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var k [KeySize]byte
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_, err := rand.Read(k[:])
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if err != nil {
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return nil, err
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}
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return (*Key)(&k), nil
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}
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func ParseKey(b64 string) (*Key, error) { return parseKeyBase64(base64.StdEncoding, b64) }
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func ParseHexKey(s string) (Key, error) {
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b, err := hex.DecodeString(s)
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if err != nil {
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return Key{}, &ParseError{"invalid hex key: " + err.Error(), s}
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}
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if len(b) != KeySize {
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return Key{}, &ParseError{fmt.Sprintf("invalid hex key length: %d", len(b)), s}
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}
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var key Key
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copy(key[:], b)
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return key, nil
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}
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func ParsePrivateHexKey(v string) (PrivateKey, error) {
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k, err := ParseHexKey(v)
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if err != nil {
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return PrivateKey{}, err
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}
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pk := PrivateKey(k)
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if pk.IsZero() {
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// Do not clamp a zero key, pass the zero through
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// (much like NaN propagation) so that IsZero reports
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// a useful result.
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return pk, nil
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}
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pk.clamp()
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return pk, nil
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}
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func (k Key) Base64() string { return base64.StdEncoding.EncodeToString(k[:]) }
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func (k Key) String() string { return k.ShortString() }
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func (k Key) HexString() string { return hex.EncodeToString(k[:]) }
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func (k Key) Equal(k2 Key) bool { return subtle.ConstantTimeCompare(k[:], k2[:]) == 1 }
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func (k *Key) ShortString() string {
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long := k.Base64()
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return "[" + long[0:5] + "]"
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}
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func (k *Key) IsZero() bool {
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if k == nil {
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return true
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}
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var zeros Key
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return subtle.ConstantTimeCompare(zeros[:], k[:]) == 1
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}
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func (k *Key) MarshalJSON() ([]byte, error) {
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if k == nil {
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return []byte("null"), nil
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}
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buf := new(bytes.Buffer)
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fmt.Fprintf(buf, `"%x"`, k[:])
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return buf.Bytes(), nil
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}
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func (k *Key) UnmarshalJSON(b []byte) error {
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if k == nil {
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return errors.New("wgcfg.Key: UnmarshalJSON on nil pointer")
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}
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if len(b) < 3 || b[0] != '"' || b[len(b)-1] != '"' {
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return errors.New("wgcfg.Key: UnmarshalJSON not given a string")
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}
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b = b[1 : len(b)-1]
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key, err := ParseHexKey(string(b))
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if err != nil {
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return fmt.Errorf("wgcfg.Key: UnmarshalJSON: %v", err)
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}
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copy(k[:], key[:])
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return nil
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}
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func (a *Key) LessThan(b *Key) bool {
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for i := range a {
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if a[i] < b[i] {
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return true
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} else if a[i] > b[i] {
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return false
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}
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}
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return false
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}
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// PrivateKey is curve25519 key.
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// It is used by WireGuard to represent private keys.
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type PrivateKey [KeySize]byte
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// NewPrivateKey generates a new curve25519 secret key.
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// It conforms to the format described on https://cr.yp.to/ecdh.html.
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func NewPrivateKey() (PrivateKey, error) {
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k, err := NewPresharedKey()
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if err != nil {
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return PrivateKey{}, err
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}
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k[0] &= 248
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k[31] = (k[31] & 127) | 64
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return (PrivateKey)(*k), nil
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}
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func ParsePrivateKey(b64 string) (*PrivateKey, error) {
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k, err := parseKeyBase64(base64.StdEncoding, b64)
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return (*PrivateKey)(k), err
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}
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func (k *PrivateKey) String() string { return base64.StdEncoding.EncodeToString(k[:]) }
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func (k *PrivateKey) HexString() string { return hex.EncodeToString(k[:]) }
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func (k *PrivateKey) Equal(k2 PrivateKey) bool { return subtle.ConstantTimeCompare(k[:], k2[:]) == 1 }
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func (k *PrivateKey) IsZero() bool {
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pk := Key(*k)
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return pk.IsZero()
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}
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func (k *PrivateKey) clamp() {
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k[0] &= 248
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k[31] = (k[31] & 127) | 64
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}
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// Public computes the public key matching this curve25519 secret key.
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func (k *PrivateKey) Public() Key {
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pk := Key(*k)
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if pk.IsZero() {
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panic("Tried to generate emptyPrivateKey.Public()")
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}
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var p [KeySize]byte
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curve25519.ScalarBaseMult(&p, (*[KeySize]byte)(k))
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return (Key)(p)
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}
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func (k PrivateKey) MarshalText() ([]byte, error) {
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buf := new(bytes.Buffer)
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fmt.Fprintf(buf, `privkey:%x`, k[:])
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return buf.Bytes(), nil
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}
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func (k *PrivateKey) UnmarshalText(b []byte) error {
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s := string(b)
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if !strings.HasPrefix(s, `privkey:`) {
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return errors.New("wgcfg.PrivateKey: UnmarshalText not given a private-key string")
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}
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s = strings.TrimPrefix(s, `privkey:`)
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key, err := ParseHexKey(s)
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if err != nil {
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return fmt.Errorf("wgcfg.PrivateKey: UnmarshalText: %v", err)
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}
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copy(k[:], key[:])
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return nil
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}
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func (k PrivateKey) SharedSecret(pub Key) (ss [KeySize]byte) {
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apk := (*[KeySize]byte)(&pub)
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ask := (*[KeySize]byte)(&k)
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curve25519.ScalarMult(&ss, ask, apk) //lint:ignore SA1019 Jason says this is OK; match wireguard-go exactyl
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return ss
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}
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func parseKeyBase64(enc *base64.Encoding, s string) (*Key, error) {
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k, err := enc.DecodeString(s)
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if err != nil {
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return nil, &ParseError{"Invalid key: " + err.Error(), s}
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}
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if len(k) != KeySize {
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return nil, &ParseError{"Keys must decode to exactly 32 bytes", s}
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}
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var key Key
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copy(key[:], k)
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return &key, nil
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}
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func ParseSymmetricKey(b64 string) (SymmetricKey, error) {
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k, err := parseKeyBase64(base64.StdEncoding, b64)
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if err != nil {
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return SymmetricKey{}, err
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}
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return SymmetricKey(*k), nil
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}
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func ParseSymmetricHexKey(s string) (SymmetricKey, error) {
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b, err := hex.DecodeString(s)
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if err != nil {
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return SymmetricKey{}, &ParseError{"invalid symmetric hex key: " + err.Error(), s}
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}
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if len(b) != chacha20poly1305.KeySize {
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return SymmetricKey{}, &ParseError{fmt.Sprintf("invalid symmetric hex key length: %d", len(b)), s}
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}
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var key SymmetricKey
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copy(key[:], b)
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return key, nil
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}
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// SymmetricKey is a chacha20poly1305 key.
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// It is used by WireGuard to represent pre-shared symmetric keys.
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type SymmetricKey [chacha20poly1305.KeySize]byte
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func (k SymmetricKey) Base64() string { return base64.StdEncoding.EncodeToString(k[:]) }
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func (k SymmetricKey) String() string { return "sym:" + k.Base64()[:8] }
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func (k SymmetricKey) HexString() string { return hex.EncodeToString(k[:]) }
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func (k SymmetricKey) IsZero() bool { return k.Equal(SymmetricKey{}) }
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func (k SymmetricKey) Equal(k2 SymmetricKey) bool {
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return subtle.ConstantTimeCompare(k[:], k2[:]) == 1
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}
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