153 lines
3.7 KiB
Go
153 lines
3.7 KiB
Go
package headscale
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import (
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"crypto/rand"
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"encoding/hex"
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"errors"
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"strconv"
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"time"
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"google.golang.org/protobuf/types/known/timestamppb"
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"gorm.io/gorm"
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v1 "github.com/juanfont/headscale/gen/go/headscale/v1"
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)
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const (
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errorAuthKeyNotFound = Error("AuthKey not found")
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errorAuthKeyExpired = Error("AuthKey expired")
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errSingleUseAuthKeyHasBeenUsed = Error("AuthKey has already been used")
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)
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// PreAuthKey describes a pre-authorization key usable in a particular namespace
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type PreAuthKey struct {
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ID uint64 `gorm:"primary_key"`
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Key string
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NamespaceID uint
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Namespace Namespace
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Reusable bool
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Ephemeral bool `gorm:"default:false"`
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Used bool `gorm:"default:false"`
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CreatedAt *time.Time
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Expiration *time.Time
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}
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// CreatePreAuthKey creates a new PreAuthKey in a namespace, and returns it
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func (h *Headscale) CreatePreAuthKey(
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namespaceName string,
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reusable bool,
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ephemeral bool,
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expiration *time.Time,
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) (*PreAuthKey, error) {
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n, err := h.GetNamespace(namespaceName)
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if err != nil {
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return nil, err
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}
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now := time.Now().UTC()
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kstr, err := h.generateKey()
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if err != nil {
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return nil, err
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}
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k := PreAuthKey{
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Key: kstr,
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NamespaceID: n.ID,
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Namespace: *n,
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Reusable: reusable,
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Ephemeral: ephemeral,
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CreatedAt: &now,
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Expiration: expiration,
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}
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h.db.Save(&k)
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return &k, nil
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}
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// ListPreAuthKeys returns the list of PreAuthKeys for a namespace
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func (h *Headscale) ListPreAuthKeys(namespaceName string) ([]PreAuthKey, error) {
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n, err := h.GetNamespace(namespaceName)
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if err != nil {
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return nil, err
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}
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keys := []PreAuthKey{}
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if err := h.db.Preload("Namespace").Where(&PreAuthKey{NamespaceID: n.ID}).Find(&keys).Error; err != nil {
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return nil, err
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}
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return keys, nil
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}
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// GetPreAuthKey returns a PreAuthKey for a given key
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func (h *Headscale) GetPreAuthKey(namespace string, key string) (*PreAuthKey, error) {
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pak, err := h.checkKeyValidity(key)
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if err != nil {
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return nil, err
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}
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if pak.Namespace.Name != namespace {
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return nil, errors.New("Namespace mismatch")
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}
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return pak, nil
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}
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// MarkExpirePreAuthKey marks a PreAuthKey as expired
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func (h *Headscale) ExpirePreAuthKey(k *PreAuthKey) error {
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if err := h.db.Model(&k).Update("Expiration", time.Now()).Error; err != nil {
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return err
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}
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return nil
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}
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// checkKeyValidity does the heavy lifting for validation of the PreAuthKey coming from a node
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// If returns no error and a PreAuthKey, it can be used
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func (h *Headscale) checkKeyValidity(k string) (*PreAuthKey, error) {
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pak := PreAuthKey{}
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if result := h.db.Preload("Namespace").First(&pak, "key = ?", k); errors.Is(result.Error, gorm.ErrRecordNotFound) {
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return nil, errorAuthKeyNotFound
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}
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if pak.Expiration != nil && pak.Expiration.Before(time.Now()) {
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return nil, errorAuthKeyExpired
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}
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if pak.Reusable || pak.Ephemeral { // we don't need to check if has been used before
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return &pak, nil
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}
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machines := []Machine{}
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if err := h.db.Preload("AuthKey").Where(&Machine{AuthKeyID: uint(pak.ID)}).Find(&machines).Error; err != nil {
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return nil, err
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}
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if len(machines) != 0 || pak.Used {
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return nil, errSingleUseAuthKeyHasBeenUsed
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}
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return &pak, nil
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}
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func (h *Headscale) generateKey() (string, error) {
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size := 24
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bytes := make([]byte, size)
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if _, err := rand.Read(bytes); err != nil {
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return "", err
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}
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return hex.EncodeToString(bytes), nil
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}
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func (key *PreAuthKey) toProto() *v1.PreAuthKey {
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return &v1.PreAuthKey{
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Namespace: key.Namespace.Name,
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Id: strconv.FormatUint(key.ID, 10),
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Key: key.Key,
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Resuable: key.Reusable,
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Ephemeral: key.Ephemeral,
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Used: key.Used,
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Expiration: timestamppb.New(*key.Expiration),
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CreatedAt: timestamppb.New(*key.CreatedAt),
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}
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}
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