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minio/auth-handler.go

77 lines
2.1 KiB

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