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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| package middleware | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "errors" | ||
| "fmt" | ||
| "net/http" | ||
| "os" | ||
| "strings" | ||
| "time" | ||
|
|
||
| "github.com/dappnode/validator-monitoring/listener/internal/logger" | ||
| "github.com/golang-jwt/jwt/v5" | ||
| ) | ||
|
|
||
| var allowedPublicKeys []string | ||
|
|
||
| // Runs automatically in main.go when the package is imported | ||
| func init() { | ||
| // Load public keys from a JSON file | ||
| data, err := os.ReadFile("/app/jwt/public_keys.json") | ||
| if err != nil { | ||
| logger.Fatal("Failed to load public keys: " + err.Error()) | ||
| } | ||
|
|
||
| var keys struct { | ||
| AllowedPublicKeys []string `json:"allowedPublicKeys"` | ||
| } | ||
|
|
||
| err = json.Unmarshal(data, &keys) | ||
| if err != nil { | ||
| logger.Fatal("Failed to unmarshal public keys: " + err.Error()) | ||
| } | ||
|
|
||
| allowedPublicKeys = keys.AllowedPublicKeys | ||
| logger.Info("Loaded public keys: " + fmt.Sprintln(allowedPublicKeys)) | ||
| } | ||
|
|
||
| // CustomClaims defines the custom claims in the JWT token | ||
| type MyCustomClaims struct { | ||
| PubKey string `json:"pubkey"` | ||
| jwt.RegisteredClaims | ||
| } | ||
|
|
||
| // JWTMiddleware is a middleware that checks the Authorization header for a valid JWT token | ||
| // and verifies the signature using the public key of the user contained in the token. | ||
| // The public keys are loaded from a JSON file. | ||
| // The JWT token must be in the format "Bearer <token string>" | ||
| func JWTMiddleware(next http.Handler) http.Handler { | ||
| return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | ||
| authHeader := r.Header.Get("Authorization") | ||
| if authHeader == "" { | ||
| http.Error(w, "Missing Authorization header", http.StatusUnauthorized) | ||
| return | ||
| } | ||
|
|
||
| tokenString := strings.TrimPrefix(authHeader, "Bearer ") | ||
| if tokenString == authHeader { | ||
| http.Error(w, "Invalid Authorization header format", http.StatusUnauthorized) | ||
| return | ||
| } | ||
|
|
||
| // Parse the token | ||
| token, err := jwt.ParseWithClaims(tokenString, &MyCustomClaims{}, func(token *jwt.Token) (interface{}, error) { | ||
| // Validate the algorithm | ||
| if _, ok := token.Method.(*jwt.SigningMethodECDSA); !ok { | ||
| return nil, errors.New("unexpected signing method") | ||
| } | ||
|
|
||
| // Extract the claims | ||
| claims, ok := token.Claims.(*MyCustomClaims) | ||
| logger.Info("token:" + fmt.Sprintln(token)) | ||
| if !ok { | ||
| return nil, errors.New("invalid token claims") | ||
| } | ||
|
|
||
| // Verify the expiration time | ||
| if claims.ExpiresAt != nil && !claims.ExpiresAt.Time.After(time.Now()) { | ||
| return nil, errors.New("token has expired, it expires at " + claims.ExpiresAt.Time.String() + " now is " + time.Now().String()) | ||
| } | ||
|
|
||
| // Verify that the public key is allowed | ||
| isAllowed := false | ||
| for _, allowedKey := range allowedPublicKeys { | ||
| logger.Info("allowedKey:" + allowedKey) | ||
| logger.Info("claims.PubKey:" + claims.PubKey) | ||
| if allowedKey == claims.PubKey { | ||
| isAllowed = true | ||
| break | ||
| } | ||
| } | ||
|
|
||
| if !isAllowed { | ||
| return nil, errors.New("public key not allowed") | ||
| } | ||
|
|
||
| // Parse and return the public key | ||
| pubKey, err := jwt.ParseECPublicKeyFromPEM([]byte(claims.PubKey)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| logger.Info("pubKey:" + fmt.Sprintln(pubKey)) | ||
| return pubKey, nil | ||
| }) | ||
|
|
||
| if err != nil || !token.Valid { | ||
| http.Error(w, "Invalid token: "+err.Error(), http.StatusUnauthorized) | ||
| return | ||
| } | ||
|
|
||
| next.ServeHTTP(w, r) | ||
| }) | ||
| } |
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