Official Go implementation of the Ethereum protocol
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go-ethereum/node/jwt_handler.go

81 lines
2.6 KiB

// Copyright 2022 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package node
import (
"net/http"
"strings"
"time"
"github.com/golang-jwt/jwt/v4"
)
const jwtExpiryTimeout = 60 * time.Second
type jwtHandler struct {
keyFunc func(token *jwt.Token) (interface{}, error)
next http.Handler
}
// newJWTHandler creates a http.Handler with jwt authentication support.
func newJWTHandler(secret []byte, next http.Handler) http.Handler {
return &jwtHandler{
keyFunc: func(token *jwt.Token) (interface{}, error) {
return secret, nil
},
next: next,
}
}
// ServeHTTP implements http.Handler
func (handler *jwtHandler) ServeHTTP(out http.ResponseWriter, r *http.Request) {
var (
strToken string
claims jwt.RegisteredClaims
)
if auth := r.Header.Get("Authorization"); strings.HasPrefix(auth, "Bearer ") {
strToken = strings.TrimPrefix(auth, "Bearer ")
}
if len(strToken) == 0 {
http.Error(out, "missing token", http.StatusForbidden)
return
}
// We explicitly set only HS256 allowed, and also disables the
// claim-check: the RegisteredClaims internally requires 'iat' to
// be no later than 'now', but we allow for a bit of drift.
token, err := jwt.ParseWithClaims(strToken, &claims, handler.keyFunc,
jwt.WithValidMethods([]string{"HS256"}),
jwt.WithoutClaimsValidation())
switch {
case err != nil:
http.Error(out, err.Error(), http.StatusForbidden)
case !token.Valid:
http.Error(out, "invalid token", http.StatusForbidden)
case !claims.VerifyExpiresAt(time.Now(), false): // optional
http.Error(out, "token is expired", http.StatusForbidden)
case claims.IssuedAt == nil:
http.Error(out, "missing issued-at", http.StatusForbidden)
case time.Since(claims.IssuedAt.Time) > jwtExpiryTimeout:
http.Error(out, "stale token", http.StatusForbidden)
case time.Until(claims.IssuedAt.Time) > jwtExpiryTimeout:
http.Error(out, "future token", http.StatusForbidden)
default:
handler.next.ServeHTTP(out, r)
}
}