| 1 | package auth |
| 2 | |
| 3 | import ( |
| 4 | "errors" |
| 5 | "fmt" |
| 6 | "strings" |
| 7 | "time" |
| 8 | |
| 9 | "github.com/spruceid/siwe-go" |
| 10 | |
| 11 | "github.com/gosuda/portal-tunnel/v2/portal/identity" |
| 12 | "github.com/gosuda/portal-tunnel/v2/types" |
| 13 | "github.com/gosuda/portal-tunnel/v2/utils" |
| 14 | ) |
| 15 | |
| 16 | var ( |
| 17 | ErrRegisterChallengeExpired = errors.New("register challenge expired") |
| 18 | ErrRegisterChallengeNotFound = errors.New("register challenge not found") |
| 19 | ErrRegisterChallengeInvalidSignature = errors.New("siwe signature is invalid") |
| 20 | ) |
| 21 | |
| 22 | type RegisterChallenge struct { |
| 23 | ChallengeID string |
| 24 | ExpiresAt time.Time |
| 25 | Request types.RegisterChallengeRequest |
| 26 | SIWEMessage string |
| 27 | |
| 28 | domain string |
| 29 | nonce string |
| 30 | } |
| 31 | |
| 32 | func NewRegisterChallenge(req types.RegisterChallengeRequest, domain, uri string, now time.Time, ttl time.Duration) (*RegisterChallenge, error) { |
| 33 | normalizedIdentity, err := identity.NormalizeIdentity(req.Identity) |
| 34 | if err != nil { |
| 35 | return nil, err |
| 36 | } |
| 37 | |
| 38 | challengeID := utils.RandomID("rch_") |
| 39 | nonce := siwe.GenerateNonce() |
| 40 | expiresAt := now.UTC().Add(ttl) |
| 41 | message, err := siwe.InitMessage(domain, normalizedIdentity.Address, uri, nonce, map[string]interface{}{ |
| 42 | "statement": "Register a portal lease", |
| 43 | "chainId": 1, |
| 44 | "issuedAt": now.UTC().Format(time.RFC3339), |
| 45 | "expirationTime": expiresAt.UTC().Format(time.RFC3339), |
| 46 | "requestId": challengeID, |
| 47 | }) |
| 48 | if err != nil { |
| 49 | return nil, fmt.Errorf("build siwe message: %w", err) |
| 50 | } |
| 51 | |
| 52 | req.Identity = normalizedIdentity |
| 53 | req.Metadata = req.Metadata.Copy() |
| 54 | |
| 55 | return &RegisterChallenge{ |
| 56 | ChallengeID: challengeID, |
| 57 | ExpiresAt: expiresAt, |
| 58 | Request: req, |
| 59 | SIWEMessage: message.String(), |
| 60 | domain: strings.TrimSpace(domain), |
| 61 | nonce: nonce, |
| 62 | }, nil |
| 63 | } |
| 64 | |
| 65 | func (c *RegisterChallenge) Expired(now time.Time) bool { |
| 66 | return c == nil || now.After(c.ExpiresAt) |
| 67 | } |
| 68 | |
| 69 | func (c *RegisterChallenge) Verify(req types.RegisterRequest, now time.Time) error { |
| 70 | if c == nil { |
| 71 | return ErrRegisterChallengeNotFound |
| 72 | } |
| 73 | if strings.TrimSpace(req.SIWEMessage) != c.SIWEMessage { |
| 74 | return errors.New("siwe message does not match register challenge") |
| 75 | } |
| 76 | message, err := siwe.ParseMessage(strings.TrimSpace(c.SIWEMessage)) |
| 77 | if err != nil { |
| 78 | return ErrRegisterChallengeInvalidSignature |
| 79 | } |
| 80 | normalizedDomain := strings.TrimSpace(c.domain) |
| 81 | normalizedNonce := strings.TrimSpace(c.nonce) |
| 82 | verifiedAt := now.UTC() |
| 83 | if _, err := message.Verify(strings.TrimSpace(req.SIWESignature), &normalizedDomain, &normalizedNonce, &verifiedAt); err != nil { |
| 84 | return ErrRegisterChallengeInvalidSignature |
| 85 | } |
| 86 | return nil |
| 87 | } |