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119 lines
3.4 KiB
119 lines
3.4 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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"crypto/sha256"
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"encoding/hex"
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"net/http"
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"github.com/minio/minio/pkg/probe"
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signv4 "github.com/minio/minio/pkg/signature"
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)
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type signatureHandler struct {
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handler http.Handler
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}
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// SignatureHandler to validate authorization header for the incoming request.
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func SignatureHandler(h http.Handler) http.Handler {
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return signatureHandler{h}
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}
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func isRequestSignatureV4(req *http.Request) bool {
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if _, ok := req.Header["Authorization"]; ok {
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return ok
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}
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return false
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}
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func isRequestPresignedSignatureV4(req *http.Request) bool {
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if _, ok := req.URL.Query()["X-Amz-Credential"]; ok {
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return ok
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}
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return false
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}
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func (s signatureHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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var signature *signv4.Signature
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if isRequestSignatureV4(r) {
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// If the request is not a PUT method handle the verification here.
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// For PUT and POST requests with payload, send the call upwards for verification
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if r.Method != "PUT" && r.Method != "POST" {
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// Init signature V4 verification
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var err *probe.Error
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signature, err = initSignatureV4(r)
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if err != nil {
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switch err.ToGoError() {
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case errInvalidRegion:
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errorIf(err.Trace(), "Unknown region in authorization header.", nil)
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writeErrorResponse(w, r, AuthorizationHeaderMalformed, r.URL.Path)
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return
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case errAccessKeyIDInvalid:
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errorIf(err.Trace(), "Invalid access key id.", nil)
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writeErrorResponse(w, r, InvalidAccessKeyID, r.URL.Path)
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return
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default:
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errorIf(err.Trace(), "Initializing signature v4 failed.", nil)
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writeErrorResponse(w, r, InternalError, r.URL.Path)
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return
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}
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}
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value := sha256.Sum256([]byte(""))
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ok, err := signature.DoesSignatureMatch(hex.EncodeToString(value[:]))
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if err != nil {
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errorIf(err.Trace(), "Unable to verify signature.", nil)
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writeErrorResponse(w, r, InternalError, r.URL.Path)
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return
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}
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if !ok {
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writeErrorResponse(w, r, SignatureDoesNotMatch, r.URL.Path)
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return
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}
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}
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s.handler.ServeHTTP(w, r)
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return
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}
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if isRequestPresignedSignatureV4(r) {
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var err *probe.Error
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signature, err = initPresignedSignatureV4(r)
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if err != nil {
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switch err.ToGoError() {
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case errAccessKeyIDInvalid:
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errorIf(err.Trace(), "Invalid access key id requested.", nil)
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writeErrorResponse(w, r, InvalidAccessKeyID, r.URL.Path)
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return
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default:
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errorIf(err.Trace(), "Initializing signature v4 failed.", nil)
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writeErrorResponse(w, r, InternalError, r.URL.Path)
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return
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}
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}
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ok, err := signature.DoesPresignedSignatureMatch()
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if err != nil {
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errorIf(err.Trace(), "Unable to verify signature.", nil)
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writeErrorResponse(w, r, InternalError, r.URL.Path)
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return
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}
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if !ok {
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writeErrorResponse(w, r, SignatureDoesNotMatch, r.URL.Path)
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return
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}
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s.handler.ServeHTTP(w, r)
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}
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writeErrorResponse(w, r, AccessDenied, r.URL.Path)
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}
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