219 lines
6.5 KiB
Go
219 lines
6.5 KiB
Go
/*
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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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"errors"
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"net/http"
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"strings"
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"time"
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router "github.com/gorilla/mux"
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"github.com/rs/cors"
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)
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// MiddlewareHandler - useful to chain different middleware http.Handler
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type MiddlewareHandler func(http.Handler) http.Handler
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func registerCustomMiddleware(mux *router.Router, mwHandlers ...MiddlewareHandler) http.Handler {
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var f http.Handler
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f = mux
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for _, mw := range mwHandlers {
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f = mw(f)
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}
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return f
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}
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type timeHandler struct {
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handler http.Handler
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}
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type resourceHandler struct {
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handler http.Handler
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}
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type ignoreSignatureV2RequestHandler struct {
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handler http.Handler
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}
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func parseDate(req *http.Request) (time.Time, error) {
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amzDate := req.Header.Get(http.CanonicalHeaderKey("x-amz-date"))
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switch {
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case amzDate != "":
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if _, err := time.Parse(time.RFC1123, amzDate); err == nil {
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return time.Parse(time.RFC1123, amzDate)
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}
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if _, err := time.Parse(time.RFC1123Z, amzDate); err == nil {
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return time.Parse(time.RFC1123Z, amzDate)
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}
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if _, err := time.Parse(iso8601Format, amzDate); err == nil {
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return time.Parse(iso8601Format, amzDate)
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}
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}
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minioDate := req.Header.Get(http.CanonicalHeaderKey("x-minio-date"))
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switch {
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case minioDate != "":
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if _, err := time.Parse(time.RFC1123, minioDate); err == nil {
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return time.Parse(time.RFC1123, minioDate)
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}
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if _, err := time.Parse(time.RFC1123Z, minioDate); err == nil {
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return time.Parse(time.RFC1123Z, minioDate)
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}
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if _, err := time.Parse(iso8601Format, minioDate); err == nil {
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return time.Parse(iso8601Format, minioDate)
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}
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}
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date := req.Header.Get("Date")
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switch {
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case date != "":
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if _, err := time.Parse(time.RFC1123, date); err == nil {
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return time.Parse(time.RFC1123, date)
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}
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if _, err := time.Parse(time.RFC1123Z, date); err == nil {
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return time.Parse(time.RFC1123Z, date)
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}
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if _, err := time.Parse(iso8601Format, amzDate); err == nil {
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return time.Parse(iso8601Format, amzDate)
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}
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}
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return time.Time{}, errors.New("invalid request")
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}
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// TimeValidityHandler to validate parsable time over http header
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func TimeValidityHandler(h http.Handler) http.Handler {
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return timeHandler{h}
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}
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func (h timeHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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// Verify if date headers are set, if not reject the request
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if r.Header.Get("Authorization") != "" {
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if r.Header.Get(http.CanonicalHeaderKey("x-amz-date")) == "" && r.Header.Get(http.CanonicalHeaderKey("x-minio-date")) == "" && r.Header.Get("Date") == "" {
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// there is no way to knowing if this is a valid request, could be a attack reject such clients
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writeErrorResponse(w, r, RequestTimeTooSkewed, r.URL.Path)
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return
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}
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date, err := parseDate(r)
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if err != nil {
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// there is no way to knowing if this is a valid request, could be a attack reject such clients
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writeErrorResponse(w, r, RequestTimeTooSkewed, r.URL.Path)
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return
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}
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duration := time.Since(date)
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minutes := time.Duration(5) * time.Minute
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if duration.Minutes() > minutes.Minutes() {
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writeErrorResponse(w, r, RequestTimeTooSkewed, r.URL.Path)
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return
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}
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}
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h.handler.ServeHTTP(w, r)
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}
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// CorsHandler handler for CORS (Cross Origin Resource Sharing)
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func CorsHandler(h http.Handler) http.Handler {
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c := cors.New(cors.Options{
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AllowedOrigins: []string{"*"},
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AllowedMethods: []string{"GET", "HEAD", "POST"},
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AllowedHeaders: []string{"*"},
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})
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return c.Handler(h)
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}
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// IgnoreSignatureV2RequestHandler -
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// Verify if authorization header has signature version '2', reject it cleanly.
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func IgnoreSignatureV2RequestHandler(h http.Handler) http.Handler {
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return ignoreSignatureV2RequestHandler{h}
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}
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// Ignore signature version '2' ServerHTTP() wrapper.
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func (h ignoreSignatureV2RequestHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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if _, ok := r.Header["Authorization"]; ok {
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if !strings.HasPrefix(r.Header.Get("Authorization"), authHeaderPrefix) {
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writeErrorResponse(w, r, SignatureVersionNotSupported, r.URL.Path)
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return
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}
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}
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h.handler.ServeHTTP(w, r)
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}
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// IgnoreResourcesHandler -
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// Ignore resources handler is wrapper handler used for API request resource validation
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// Since we do not support all the S3 queries, it is necessary for us to throw back a
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// valid error message indicating such a feature is not implemented.
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func IgnoreResourcesHandler(h http.Handler) http.Handler {
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return resourceHandler{h}
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}
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// Resource handler ServeHTTP() wrapper
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func (h resourceHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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// Skip the first element which is usally '/' and split the rest.
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splits := strings.SplitN(r.URL.Path[1:], "/", 2)
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// Save bucketName and objectName extracted from url Path.
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var bucketName, objectName string
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if len(splits) == 1 {
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bucketName = splits[0]
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}
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if len(splits) == 2 {
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bucketName = splits[0]
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objectName = splits[1]
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}
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// If bucketName is present and not objectName check for bucket
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// level resource queries.
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if bucketName != "" && objectName == "" {
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if ignoreNotImplementedBucketResources(r) {
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writeErrorResponse(w, r, NotImplemented, r.URL.Path)
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return
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}
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}
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// If bucketName and objectName are present check for its resource queries.
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if bucketName != "" && objectName != "" {
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if ignoreNotImplementedObjectResources(r) {
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writeErrorResponse(w, r, NotImplemented, r.URL.Path)
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return
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}
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}
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// A put method on path "/" doesn't make sense, ignore it.
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if r.Method == "PUT" && r.URL.Path == "/" {
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writeErrorResponse(w, r, NotImplemented, r.URL.Path)
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return
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}
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h.handler.ServeHTTP(w, r)
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}
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//// helpers
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// Checks requests for not implemented Bucket resources
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func ignoreNotImplementedBucketResources(req *http.Request) bool {
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q := req.URL.Query()
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for name := range q {
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if notimplementedBucketResourceNames[name] {
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return true
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}
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}
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return false
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}
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// Checks requests for not implemented Object resources
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func ignoreNotImplementedObjectResources(req *http.Request) bool {
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q := req.URL.Query()
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for name := range q {
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if notimplementedObjectResourceNames[name] {
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return true
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}
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}
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return false
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}
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