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minio/pkg/server/api/generic-handlers.go

193 lines
5.7 KiB

/*
* Minimalist Object 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 api
import (
"errors"
"net/http"
"time"
"github.com/minio/minio/pkg/auth"
)
type contentTypeHandler struct {
handler http.Handler
}
type timeHandler struct {
handler http.Handler
}
type validateAuthHandler struct {
handler http.Handler
}
type resourceHandler struct {
handler http.Handler
}
const (
iso8601Format = "20060102T150405Z"
)
func parseDate(req *http.Request) (time.Time, error) {
amzDate := req.Header.Get(http.CanonicalHeaderKey("x-amz-date"))
switch {
case amzDate != "":
if _, err := time.Parse(time.RFC1123, amzDate); err == nil {
return time.Parse(time.RFC1123, amzDate)
}
if _, err := time.Parse(time.RFC1123Z, amzDate); err == nil {
return time.Parse(time.RFC1123Z, amzDate)
}
if _, err := time.Parse(iso8601Format, amzDate); err == nil {
return time.Parse(iso8601Format, amzDate)
}
}
date := req.Header.Get("Date")
switch {
case date != "":
if _, err := time.Parse(time.RFC1123, date); err == nil {
return time.Parse(time.RFC1123, date)
}
if _, err := time.Parse(time.RFC1123Z, date); err == nil {
return time.Parse(time.RFC1123Z, date)
}
if _, err := time.Parse(iso8601Format, amzDate); err == nil {
return time.Parse(iso8601Format, amzDate)
}
}
return time.Time{}, errors.New("invalid request")
}
// ValidContentTypeHandler -
func ValidContentTypeHandler(h http.Handler) http.Handler {
return contentTypeHandler{h}
}
func (h contentTypeHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
acceptsContentType := getContentType(r)
if acceptsContentType == unknownContentType {
writeErrorResponse(w, r, NotAcceptable, acceptsContentType, r.URL.Path)
return
}
h.handler.ServeHTTP(w, r)
}
// TimeValidityHandler -
func TimeValidityHandler(h http.Handler) http.Handler {
return timeHandler{h}
}
func (h timeHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
acceptsContentType := getContentType(r)
// Verify if date headers are set, if not reject the request
if r.Header.Get("Authorization") != "" {
if r.Header.Get(http.CanonicalHeaderKey("x-amz-date")) == "" && r.Header.Get("Date") == "" {
// there is no way to knowing if this is a valid request, could be a attack reject such clients
writeErrorResponse(w, r, RequestTimeTooSkewed, acceptsContentType, r.URL.Path)
return
}
date, err := parseDate(r)
if err != nil {
// there is no way to knowing if this is a valid request, could be a attack reject such clients
writeErrorResponse(w, r, RequestTimeTooSkewed, acceptsContentType, r.URL.Path)
return
}
duration := time.Since(date)
minutes := time.Duration(5) * time.Minute
if duration.Minutes() > minutes.Minutes() {
writeErrorResponse(w, r, RequestTimeTooSkewed, acceptsContentType, r.URL.Path)
return
}
}
h.handler.ServeHTTP(w, r)
}
// ValidateAuthHeaderHandler -
// validate auth header handler is wrapper handler used for API request validation with authorization header.
// Current authorization layer supports S3's standard HMAC based signature request.
func ValidateAuthHeaderHandler(h http.Handler) http.Handler {
return validateAuthHandler{h}
}
// validate auth header handler ServeHTTP() wrapper
func (h validateAuthHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
acceptsContentType := getContentType(r)
accessKeyID, err := StripAccessKeyID(r.Header.Get("Authorization"))
switch err.(type) {
case nil:
// load auth config
authConfig, err := auth.LoadConfig()
if err != nil {
writeErrorResponse(w, r, InternalError, acceptsContentType, r.URL.Path)
return
}
// Access key not found
if _, ok := authConfig.Users[accessKeyID]; !ok {
writeErrorResponse(w, r, InvalidAccessKeyID, acceptsContentType, r.URL.Path)
return
}
h.handler.ServeHTTP(w, r)
default:
// control reaches here, we should just send the request up the stack - internally
// individual calls will validate themselves against un-authenticated requests
h.handler.ServeHTTP(w, r)
}
}
// IgnoreResourcesHandler -
// Ignore resources handler is wrapper handler used for API request resource validation
// Since we do not support all the S3 queries, it is necessary for us to throw back a
// valid error message indicating such a feature is not implemented.
func IgnoreResourcesHandler(h http.Handler) http.Handler {
return resourceHandler{h}
}
// Resource handler ServeHTTP() wrapper
func (h resourceHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
acceptsContentType := getContentType(r)
if ignoreNotImplementedObjectResources(r) || ignoreNotImplementedBucketResources(r) {
writeErrorResponse(w, r, NotImplemented, acceptsContentType, r.URL.Path)
return
}
h.handler.ServeHTTP(w, r)
}
//// helpers
// Checks requests for not implemented Bucket resources
func ignoreNotImplementedBucketResources(req *http.Request) bool {
q := req.URL.Query()
for name := range q {
if notimplementedBucketResourceNames[name] {
return true
}
}
return false
}
// Checks requests for not implemented Object resources
func ignoreNotImplementedObjectResources(req *http.Request) bool {
q := req.URL.Query()
for name := range q {
if notimplementedObjectResourceNames[name] {
return true
}
}
return false
}