minio/pkg/api/api_generic_handlers.go

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/*
* 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"
"strings"
"time"
"github.com/minio-io/minio/pkg/api/config"
)
type timeHandler struct {
handler http.Handler
}
type validateHandler struct {
conf config.Config
handler http.Handler
}
type resourceHandler struct {
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handler http.Handler
}
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// strip AccessKey from authorization header
func stripAccessKey(r *http.Request) string {
fields := strings.Fields(r.Header.Get("Authorization"))
if len(fields) < 2 {
return ""
}
splits := strings.Split(fields[1], ":")
if len(splits) < 2 {
return ""
}
return splits[0]
}
func getDate(req *http.Request) (time.Time, error) {
amzDate := req.Header.Get("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)
}
}
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)
}
}
return time.Time{}, errors.New("invalid request")
}
func timeValidityHandler(h http.Handler) http.Handler {
return timeHandler{h}
}
func (h timeHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
acceptsContentType := getContentType(r)
if acceptsContentType == unknownContentType {
writeErrorResponse(w, r, NotAcceptable, acceptsContentType, r.URL.Path)
return
}
// Verify if date headers are set, if not reject the request
if r.Header.Get("Authorization") != "" {
if r.Header.Get("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 := getDate(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)
}
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// Validate handler is wrapper handler used for API request validation with authorization header.
// Current authorization layer supports S3's standard HMAC based signature request.
func validateRequestHandler(conf config.Config, h http.Handler) http.Handler {
return validateHandler{
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conf: conf,
handler: h,
}
}
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// Validate handler ServeHTTP() wrapper
func (h validateHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
acceptsContentType := getContentType(r)
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if acceptsContentType == unknownContentType {
writeErrorResponse(w, r, NotAcceptable, acceptsContentType, r.URL.Path)
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return
}
// success
h.handler.ServeHTTP(w, r)
// Enable below only when webcli is ready
/*
switch true {
case accessKey != "":
if err := h.conf.ReadConfig(); err != nil {
writeErrorResponse(w, r, InternalError, acceptsContentType, r.URL.Path)
return
}
user, ok := h.conf.Users[accessKey]
if !ok {
writeErrorResponse(w, r, AccessDenied, acceptsContentType, r.URL.Path)
return
}
ok, _ = ValidateRequest(user, r)
if !ok {
writeErrorResponse(w, r, AccessDenied, acceptsContentType, r.URL.Path)
return
}
// Success
h.handler.ServeHTTP(w, r)
default:
// Control reaches when no access key is found, ideally we would
// like to throw back `403`. But for now with our tests lacking
// this functionality it is better for us to be serving anonymous
// requests as well.
// We should remove this after adding tests to support signature request
h.handler.ServeHTTP(w, r)
// ## Uncommented below links of code after disabling anonymous requests
// error := errorCodeError(AccessDenied)
// errorResponse := getErrorResponse(error, "")
// w.WriteHeader(error.HTTPStatusCode)
// w.Write(writeErrorResponse(w, errorResponse, acceptsContentType))
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}
*/
}
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// 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 to have been not implemented.
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func ignoreResourcesHandler(h http.Handler) http.Handler {
return resourceHandler{h}
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}
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// Resource handler ServeHTTP() wrapper
func (h resourceHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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acceptsContentType := getContentType(r)
if acceptsContentType == unknownContentType {
writeErrorResponse(w, r, NotAcceptable, acceptsContentType, r.URL.Path)
return
}
if ignoreNotImplementedObjectResources(r) || ignoreNotImplementedBucketResources(r) {
error := getErrorCode(NotImplemented)
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errorResponse := getErrorResponse(error, "")
setCommonHeaders(w, getContentTypeString(acceptsContentType))
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w.WriteHeader(error.HTTPStatusCode)
w.Write(encodeErrorResponse(errorResponse, acceptsContentType))
return
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}
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
}