| 1 | package auth |
| 2 | |
| 3 | import ( |
| 4 | "errors" |
| 5 | "fmt" |
| 6 | "strings" |
| 7 | "time" |
| 8 | |
| 9 | "github.com/gosuda/portal-tunnel/v2/portal/identity" |
| 10 | "github.com/gosuda/portal-tunnel/v2/types" |
| 11 | "github.com/gosuda/portal-tunnel/v2/utils" |
| 12 | ) |
| 13 | |
| 14 | var ErrHopRouteSignatureInvalid = errors.New("hop route signature is invalid") |
| 15 | |
| 16 | func normalizeHopRoute(route *types.HopRoute, requireOwner bool) error { |
| 17 | ownerPublicKey := strings.ToLower(utils.TrimHexPrefix(strings.TrimSpace(route.OwnerPublicKey))) |
| 18 | if ownerPublicKey != "" { |
| 19 | if _, err := identity.ParseSecp256k1PublicKeyHex(ownerPublicKey); err != nil { |
| 20 | return fmt.Errorf("hop route owner public key: %w", err) |
| 21 | } |
| 22 | } else if requireOwner { |
| 23 | return errors.New("hop route owner public key is required") |
| 24 | } |
| 25 | |
| 26 | relayURL, err := utils.NormalizeRelayURL(route.RelayURL) |
| 27 | if err != nil { |
| 28 | return fmt.Errorf("hop relay url: %w", err) |
| 29 | } |
| 30 | |
| 31 | route.OwnerPublicKey = ownerPublicKey |
| 32 | route.RelayURL = relayURL |
| 33 | route.PublicHostname = utils.NormalizeHostname(route.PublicHostname) |
| 34 | route.RouteHostname = utils.NormalizeHostname(route.RouteHostname) |
| 35 | route.HostnameHash = strings.TrimSpace(route.HostnameHash) |
| 36 | route.MatchToken = strings.TrimSpace(route.MatchToken) |
| 37 | route.Metadata = route.Metadata.Copy() |
| 38 | route.ForwardToken = strings.TrimSpace(route.ForwardToken) |
| 39 | route.ExpiresAt = route.ExpiresAt.UTC() |
| 40 | route.Signature = strings.TrimSpace(route.Signature) |
| 41 | return nil |
| 42 | } |
| 43 | |
| 44 | func SignHopRoute(method string, route types.HopRoute, authority identity.Authority, expiresAt time.Time) (types.HopRoute, error) { |
| 45 | if authority == nil { |
| 46 | return types.HopRoute{}, errors.New("hop route signing authority is required") |
| 47 | } |
| 48 | route.ExpiresAt = expiresAt.UTC() |
| 49 | route.Signature = "" |
| 50 | route.OwnerPublicKey = "" |
| 51 | |
| 52 | if err := normalizeHopRoute(&route, false); err != nil { |
| 53 | return types.HopRoute{}, err |
| 54 | } |
| 55 | ownerIdentity := authority.Identity() |
| 56 | ownerPublicKey := strings.ToLower(utils.TrimHexPrefix(strings.TrimSpace(ownerIdentity.PublicKey))) |
| 57 | if ownerPublicKey == "" { |
| 58 | return types.HopRoute{}, errors.New("hop route owner identity is required") |
| 59 | } |
| 60 | if _, err := identity.ParseSecp256k1PublicKeyHex(ownerPublicKey); err != nil { |
| 61 | return types.HopRoute{}, fmt.Errorf("hop route owner public key: %w", err) |
| 62 | } |
| 63 | |
| 64 | route.OwnerPublicKey = ownerPublicKey |
| 65 | payload, err := types.HopRouteBytes(method, route) |
| 66 | if err != nil { |
| 67 | return types.HopRoute{}, err |
| 68 | } |
| 69 | signature, err := authority.SignSHA256Secp256k1(payload) |
| 70 | if err != nil { |
| 71 | return types.HopRoute{}, err |
| 72 | } |
| 73 | route.Signature, err = signature.DERHex() |
| 74 | if err != nil { |
| 75 | return types.HopRoute{}, err |
| 76 | } |
| 77 | return route, nil |
| 78 | } |
| 79 | |
| 80 | func VerifyHopRoute(method string, route types.HopRoute) (types.HopRoute, error) { |
| 81 | signature := strings.TrimSpace(route.Signature) |
| 82 | route.Signature = "" |
| 83 | |
| 84 | if err := normalizeHopRoute(&route, true); err != nil { |
| 85 | return types.HopRoute{}, err |
| 86 | } |
| 87 | payload, err := types.HopRouteBytes(method, route) |
| 88 | if err != nil { |
| 89 | return types.HopRoute{}, err |
| 90 | } |
| 91 | if err := identity.VerifySHA256Secp256k1DER(payload, route.OwnerPublicKey, signature); err != nil { |
| 92 | return types.HopRoute{}, ErrHopRouteSignatureInvalid |
| 93 | } |
| 94 | route.Signature = signature |
| 95 | return route, nil |
| 96 | } |