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88 lines
2.5 KiB
88 lines
2.5 KiB
/*
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* Minio Cloud Storage, (C) 2015 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package main
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import (
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"fmt"
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"net/http"
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jwtgo "github.com/dgrijalva/jwt-go"
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)
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const (
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signV4Algorithm = "AWS4-HMAC-SHA256"
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jwtAlgorithm = "Bearer"
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)
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// authHandler - handles all the incoming authorization headers and
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// validates them if possible.
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type authHandler struct {
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handler http.Handler
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}
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// setAuthHandler to validate authorization header for the incoming request.
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func setAuthHandler(h http.Handler) http.Handler {
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return authHandler{h}
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}
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// handler for validating incoming authorization headers.
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func (a authHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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// Verify if request is presigned, validate signature inside each handlers.
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if isRequestPresignedSignatureV4(r) {
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a.handler.ServeHTTP(w, r)
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return
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}
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// Verify if request has post policy signature, validate signature
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// inside POST policy handler.
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if isRequestPostPolicySignatureV4(r) && r.Method == "POST" {
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a.handler.ServeHTTP(w, r)
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return
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}
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// No authorization found, let the top level caller validate if
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// public request is allowed.
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if _, ok := r.Header["Authorization"]; !ok {
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a.handler.ServeHTTP(w, r)
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return
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}
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// Verify if the signature algorithms are known.
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if !isRequestSignatureV4(r) && !isRequestJWT(r) {
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writeErrorResponse(w, r, SignatureVersionNotSupported, r.URL.Path)
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return
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}
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// Verify JWT authorization header is present.
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if isRequestJWT(r) {
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// Validate Authorization header to be valid.
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jwt := InitJWT()
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token, e := jwtgo.ParseFromRequest(r, func(token *jwtgo.Token) (interface{}, error) {
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if _, ok := token.Method.(*jwtgo.SigningMethodHMAC); !ok {
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return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
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}
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return jwt.secretAccessKey, nil
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})
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if e != nil || !token.Valid {
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w.WriteHeader(http.StatusUnauthorized)
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return
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}
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}
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// For all other signed requests, let top level caller verify.
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a.handler.ServeHTTP(w, r)
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}
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