853 lines
27 KiB
Go
853 lines
27 KiB
Go
/*
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* Minio Cloud Storage, (C) 2015, 2016, 2017 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 cmd
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import (
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"bufio"
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"context"
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"net"
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"net/http"
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"strings"
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"time"
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"github.com/minio/minio-go/pkg/set"
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humanize "github.com/dustin/go-humanize"
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"github.com/minio/minio/cmd/crypto"
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"github.com/minio/minio/cmd/logger"
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"github.com/minio/minio/pkg/dns"
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"github.com/minio/minio/pkg/handlers"
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"github.com/minio/minio/pkg/sys"
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"github.com/rs/cors"
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"golang.org/x/time/rate"
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)
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// HandlerFunc - useful to chain different middleware http.Handler
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type HandlerFunc func(http.Handler) http.Handler
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func registerHandlers(h http.Handler, handlerFns ...HandlerFunc) http.Handler {
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for _, hFn := range handlerFns {
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h = hFn(h)
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}
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return h
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}
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// Adds limiting body size middleware
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// Maximum allowed form data field values. 64MiB is a guessed practical value
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// which is more than enough to accommodate any form data fields and headers.
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const requestFormDataSize = 64 * humanize.MiByte
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// For any HTTP request, request body should be not more than 16GiB + requestFormDataSize
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// where, 16GiB is the maximum allowed object size for object upload.
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const requestMaxBodySize = globalMaxObjectSize + requestFormDataSize
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type requestSizeLimitHandler struct {
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handler http.Handler
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maxBodySize int64
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}
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func setRequestSizeLimitHandler(h http.Handler) http.Handler {
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return requestSizeLimitHandler{handler: h, maxBodySize: requestMaxBodySize}
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}
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func (h requestSizeLimitHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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// Restricting read data to a given maximum length
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r.Body = http.MaxBytesReader(w, r.Body, h.maxBodySize)
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h.handler.ServeHTTP(w, r)
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}
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const (
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// Maximum size for http headers - See: https://docs.aws.amazon.com/AmazonS3/latest/dev/UsingMetadata.html
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maxHeaderSize = 8 * 1024
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// Maximum size for user-defined metadata - See: https://docs.aws.amazon.com/AmazonS3/latest/dev/UsingMetadata.html
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maxUserDataSize = 2 * 1024
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)
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type requestHeaderSizeLimitHandler struct {
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http.Handler
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}
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func setRequestHeaderSizeLimitHandler(h http.Handler) http.Handler {
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return requestHeaderSizeLimitHandler{h}
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}
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// ServeHTTP restricts the size of the http header to 8 KB and the size
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// of the user-defined metadata to 2 KB.
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func (h requestHeaderSizeLimitHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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if isHTTPHeaderSizeTooLarge(r.Header) {
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writeErrorResponse(context.Background(), w, errorCodes.ToAPIErr(ErrMetadataTooLarge), r.URL, guessIsBrowserReq(r))
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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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// isHTTPHeaderSizeTooLarge returns true if the provided
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// header is larger than 8 KB or the user-defined metadata
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// is larger than 2 KB.
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func isHTTPHeaderSizeTooLarge(header http.Header) bool {
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var size, usersize int
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for key := range header {
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length := len(key) + len(header.Get(key))
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size += length
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for _, prefix := range userMetadataKeyPrefixes {
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if strings.HasPrefix(key, prefix) {
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usersize += length
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break
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}
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}
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if usersize > maxUserDataSize || size > maxHeaderSize {
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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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// ReservedMetadataPrefix is the prefix of a metadata key which
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// is reserved and for internal use only.
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const ReservedMetadataPrefix = "X-Minio-Internal-"
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type reservedMetadataHandler struct {
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http.Handler
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}
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func filterReservedMetadata(h http.Handler) http.Handler {
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return reservedMetadataHandler{h}
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}
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// ServeHTTP fails if the request contains at least one reserved header which
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// would be treated as metadata.
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func (h reservedMetadataHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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if containsReservedMetadata(r.Header) {
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writeErrorResponse(context.Background(), w, errorCodes.ToAPIErr(ErrUnsupportedMetadata), r.URL, guessIsBrowserReq(r))
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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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// containsReservedMetadata returns true if the http.Header contains
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// keys which are treated as metadata but are reserved for internal use
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// and must not set by clients
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func containsReservedMetadata(header http.Header) bool {
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for key := range header {
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if strings.HasPrefix(key, ReservedMetadataPrefix) {
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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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// Reserved bucket.
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const (
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minioReservedBucket = "minio"
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minioReservedBucketPath = "/" + minioReservedBucket
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)
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// Adds redirect rules for incoming requests.
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type redirectHandler struct {
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handler http.Handler
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}
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func setBrowserRedirectHandler(h http.Handler) http.Handler {
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return redirectHandler{handler: h}
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}
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// Fetch redirect location if urlPath satisfies certain
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// criteria. Some special names are considered to be
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// redirectable, this is purely internal function and
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// serves only limited purpose on redirect-handler for
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// browser requests.
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func getRedirectLocation(urlPath string) (rLocation string) {
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if urlPath == minioReservedBucketPath {
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rLocation = minioReservedBucketPath + "/"
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}
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if contains([]string{
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"/",
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"/webrpc",
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"/login",
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"/favicon.ico",
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}, urlPath) {
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rLocation = minioReservedBucketPath + urlPath
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}
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return rLocation
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}
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// guessIsBrowserReq - returns true if the request is browser.
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// This implementation just validates user-agent and
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// looks for "Mozilla" string. This is no way certifiable
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// way to know if the request really came from a browser
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// since User-Agent's can be arbitrary. But this is just
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// a best effort function.
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func guessIsBrowserReq(req *http.Request) bool {
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if req == nil {
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return false
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}
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return strings.Contains(req.Header.Get("User-Agent"), "Mozilla")
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}
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// guessIsHealthCheckReq - returns true if incoming request looks
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// like healthcheck request
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func guessIsHealthCheckReq(req *http.Request) bool {
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if req == nil {
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return false
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}
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aType := getRequestAuthType(req)
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return aType == authTypeAnonymous && (req.Method == http.MethodGet || req.Method == http.MethodHead) &&
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(req.URL.Path == healthCheckPathPrefix+healthCheckLivenessPath ||
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req.URL.Path == healthCheckPathPrefix+healthCheckReadinessPath)
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}
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// guessIsMetricsReq - returns true if incoming request looks
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// like metrics request
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func guessIsMetricsReq(req *http.Request) bool {
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if req == nil {
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return false
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}
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aType := getRequestAuthType(req)
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return aType == authTypeAnonymous &&
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req.URL.Path == minioReservedBucketPath+prometheusMetricsPath
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}
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// guessIsRPCReq - returns true if the request is for an RPC endpoint.
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func guessIsRPCReq(req *http.Request) bool {
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if req == nil {
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return false
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}
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return req.Method == http.MethodPost &&
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strings.HasPrefix(req.URL.Path, minioReservedBucketPath+"/")
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}
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func (h redirectHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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aType := getRequestAuthType(r)
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// Re-direct only for JWT and anonymous requests from browser.
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if aType == authTypeJWT || aType == authTypeAnonymous {
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// Re-direction is handled specifically for browser requests.
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if guessIsBrowserReq(r) && globalIsBrowserEnabled {
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// Fetch the redirect location if any.
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redirectLocation := getRedirectLocation(r.URL.Path)
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if redirectLocation != "" {
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// Employ a temporary re-direct.
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http.Redirect(w, r, redirectLocation, http.StatusTemporaryRedirect)
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return
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}
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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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// Adds Cache-Control header
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type cacheControlHandler struct {
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handler http.Handler
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}
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func setBrowserCacheControlHandler(h http.Handler) http.Handler {
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return cacheControlHandler{h}
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}
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func (h cacheControlHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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if r.Method == http.MethodGet && guessIsBrowserReq(r) && globalIsBrowserEnabled {
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// For all browser requests set appropriate Cache-Control policies
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if hasPrefix(r.URL.Path, minioReservedBucketPath+"/") {
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if hasSuffix(r.URL.Path, ".js") || r.URL.Path == minioReservedBucketPath+"/favicon.ico" {
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// For assets set cache expiry of one year. For each release, the name
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// of the asset name will change and hence it can not be served from cache.
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w.Header().Set("Cache-Control", "max-age=31536000")
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} else {
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// For non asset requests we serve index.html which will never be cached.
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w.Header().Set("Cache-Control", "no-store")
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}
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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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// Check to allow access to the reserved "bucket" `/minio` for Admin
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// API requests.
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func isAdminReq(r *http.Request) bool {
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return strings.HasPrefix(r.URL.Path, adminAPIPathPrefix+"/")
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}
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// Adds verification for incoming paths.
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type minioReservedBucketHandler struct {
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handler http.Handler
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}
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func setReservedBucketHandler(h http.Handler) http.Handler {
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return minioReservedBucketHandler{h}
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}
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func (h minioReservedBucketHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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switch {
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case guessIsRPCReq(r), guessIsBrowserReq(r), guessIsHealthCheckReq(r), guessIsMetricsReq(r), isAdminReq(r):
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// Allow access to reserved buckets
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default:
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// For all other requests reject access to reserved
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// buckets
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bucketName, _ := urlPath2BucketObjectName(r.URL.Path)
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if isMinioReservedBucket(bucketName) || isMinioMetaBucket(bucketName) {
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writeErrorResponse(context.Background(), w, errorCodes.ToAPIErr(ErrAllAccessDisabled), r.URL, guessIsBrowserReq(r))
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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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type timeValidityHandler struct {
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handler http.Handler
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}
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// setTimeValidityHandler to validate parsable time over http header
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func setTimeValidityHandler(h http.Handler) http.Handler {
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return timeValidityHandler{h}
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}
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// Supported Amz date formats.
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var amzDateFormats = []string{
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time.RFC1123,
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time.RFC1123Z,
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iso8601Format,
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// Add new AMZ date formats here.
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}
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// Supported Amz date headers.
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var amzDateHeaders = []string{
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"x-amz-date",
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"date",
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}
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// parseAmzDate - parses date string into supported amz date formats.
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func parseAmzDate(amzDateStr string) (amzDate time.Time, apiErr APIErrorCode) {
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for _, dateFormat := range amzDateFormats {
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amzDate, err := time.Parse(dateFormat, amzDateStr)
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if err == nil {
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return amzDate, ErrNone
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}
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}
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return time.Time{}, ErrMalformedDate
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}
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// parseAmzDateHeader - parses supported amz date headers, in
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// supported amz date formats.
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func parseAmzDateHeader(req *http.Request) (time.Time, APIErrorCode) {
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for _, amzDateHeader := range amzDateHeaders {
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amzDateStr := req.Header.Get(http.CanonicalHeaderKey(amzDateHeader))
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if amzDateStr != "" {
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return parseAmzDate(amzDateStr)
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}
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}
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// Date header missing.
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return time.Time{}, ErrMissingDateHeader
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}
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func (h timeValidityHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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aType := getRequestAuthType(r)
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if aType == authTypeSigned || aType == authTypeSignedV2 || aType == authTypeStreamingSigned {
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// Verify if date headers are set, if not reject the request
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amzDate, errCode := parseAmzDateHeader(r)
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if errCode != ErrNone {
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// All our internal APIs are sensitive towards Date
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// header, for all requests where Date header is not
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// present we will reject such clients.
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writeErrorResponse(context.Background(), w, errorCodes.ToAPIErr(errCode), r.URL, guessIsBrowserReq(r))
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return
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}
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// Verify if the request date header is shifted by less than globalMaxSkewTime parameter in the past
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// or in the future, reject request otherwise.
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curTime := UTCNow()
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if curTime.Sub(amzDate) > globalMaxSkewTime || amzDate.Sub(curTime) > globalMaxSkewTime {
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writeErrorResponse(context.Background(), w, errorCodes.ToAPIErr(ErrRequestTimeTooSkewed), r.URL, guessIsBrowserReq(r))
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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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type resourceHandler struct {
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handler http.Handler
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}
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// setCorsHandler handler for CORS (Cross Origin Resource Sharing)
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func setCorsHandler(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{
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http.MethodGet,
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http.MethodPut,
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http.MethodHead,
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http.MethodPost,
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http.MethodDelete,
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http.MethodOptions,
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http.MethodPatch,
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},
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AllowedHeaders: []string{"*"},
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ExposedHeaders: []string{"*"},
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AllowCredentials: true,
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})
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return c.Handler(h)
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}
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// setIgnoreResourcesHandler -
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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 that requested feature is not implemented.
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func setIgnoreResourcesHandler(h http.Handler) http.Handler {
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return resourceHandler{h}
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}
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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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for name := range req.URL.Query() {
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// Enable GetBucketACL, GetBucketCors, GetBucketWebsite,
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// GetBucketAcccelerate, GetBucketRequestPayment,
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// GetBucketLogging, GetBucketLifecycle,
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// GetBucketReplication, GetBucketTagging,
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// GetBucketVersioning, DeleteBucketTagging,
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// and DeleteBucketWebsite dummy calls specifically.
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if ((name == "acl" ||
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name == "cors" ||
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name == "website" ||
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name == "accelerate" ||
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name == "requestPayment" ||
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name == "logging" ||
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name == "lifecycle" ||
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name == "replication" ||
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name == "tagging" ||
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name == "versioning") && req.Method == http.MethodGet) ||
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((name == "tagging" ||
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name == "website") && req.Method == http.MethodDelete) {
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return false
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}
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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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for name := range req.URL.Query() {
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// Enable GetObjectACL and GetObjectTagging dummy calls specifically.
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if (name == "acl" || name == "tagging") && req.Method == http.MethodGet {
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return false
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}
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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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// List of not implemented bucket queries
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var notimplementedBucketResourceNames = map[string]bool{
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"accelerate": true,
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"acl": true,
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"cors": true,
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"inventory": true,
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"lifecycle": true,
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"logging": true,
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"metrics": true,
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"replication": true,
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"requestPayment": true,
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"tagging": true,
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"versioning": true,
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"versions": true,
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"website": true,
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}
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// List of not implemented object queries
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var notimplementedObjectResourceNames = map[string]bool{
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"acl": true,
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"policy": true,
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"restore": true,
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"tagging": true,
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"torrent": true,
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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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bucketName, objectName := urlPath2BucketObjectName(r.URL.Path)
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// If bucketName is present and not objectName check for bucket level resource queries.
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if bucketName != "" && objectName == "" {
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if ignoreNotImplementedBucketResources(r) {
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writeErrorResponse(context.Background(), w, errorCodes.ToAPIErr(ErrNotImplemented), r.URL, guessIsBrowserReq(r))
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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(context.Background(), w, errorCodes.ToAPIErr(ErrNotImplemented), r.URL, guessIsBrowserReq(r))
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return
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}
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}
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// Serve HTTP.
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h.handler.ServeHTTP(w, r)
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}
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// httpResponseRecorder wraps http.ResponseWriter
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// to record some useful http response data.
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type httpResponseRecorder struct {
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http.ResponseWriter
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respStatusCode int
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}
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|
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// Wraps ResponseWriter's Write()
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|
func (rww *httpResponseRecorder) Write(b []byte) (int, error) {
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return rww.ResponseWriter.Write(b)
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}
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|
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// Wraps ResponseWriter's Flush()
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|
func (rww *httpResponseRecorder) Flush() {
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|
rww.ResponseWriter.(http.Flusher).Flush()
|
|
}
|
|
|
|
// Wraps ResponseWriter's WriteHeader() and record
|
|
// the response status code
|
|
func (rww *httpResponseRecorder) WriteHeader(httpCode int) {
|
|
rww.respStatusCode = httpCode
|
|
rww.ResponseWriter.WriteHeader(httpCode)
|
|
}
|
|
|
|
func (rww *httpResponseRecorder) Hijack() (net.Conn, *bufio.ReadWriter, error) {
|
|
return rww.ResponseWriter.(http.Hijacker).Hijack()
|
|
}
|
|
|
|
// httpStatsHandler definition: gather HTTP statistics
|
|
type httpStatsHandler struct {
|
|
handler http.Handler
|
|
}
|
|
|
|
// setHttpStatsHandler sets a http Stats Handler
|
|
func setHTTPStatsHandler(h http.Handler) http.Handler {
|
|
return httpStatsHandler{handler: h}
|
|
}
|
|
|
|
func (h httpStatsHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
|
// Wraps w to record http response information
|
|
ww := &httpResponseRecorder{ResponseWriter: w}
|
|
|
|
// Time start before the call is about to start.
|
|
tBefore := UTCNow()
|
|
|
|
// Execute the request
|
|
h.handler.ServeHTTP(ww, r)
|
|
|
|
// Time after call has completed.
|
|
tAfter := UTCNow()
|
|
|
|
// Time duration in secs since the call started.
|
|
//
|
|
// We don't need to do nanosecond precision in this
|
|
// simply for the fact that it is not human readable.
|
|
durationSecs := tAfter.Sub(tBefore).Seconds()
|
|
|
|
// Update http statistics
|
|
globalHTTPStats.updateStats(r, ww, durationSecs)
|
|
}
|
|
|
|
// requestValidityHandler validates all the incoming paths for
|
|
// any malicious requests.
|
|
type requestValidityHandler struct {
|
|
handler http.Handler
|
|
}
|
|
|
|
func setRequestValidityHandler(h http.Handler) http.Handler {
|
|
return requestValidityHandler{handler: h}
|
|
}
|
|
|
|
// Bad path components to be rejected by the path validity handler.
|
|
const (
|
|
dotdotComponent = ".."
|
|
dotComponent = "."
|
|
)
|
|
|
|
// Check if the incoming path has bad path components,
|
|
// such as ".." and "."
|
|
func hasBadPathComponent(path string) bool {
|
|
path = strings.TrimSpace(path)
|
|
for _, p := range strings.Split(path, slashSeparator) {
|
|
switch strings.TrimSpace(p) {
|
|
case dotdotComponent:
|
|
return true
|
|
case dotComponent:
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// Check if client is sending a malicious request.
|
|
func hasMultipleAuth(r *http.Request) bool {
|
|
authTypeCount := 0
|
|
for _, hasValidAuth := range []func(*http.Request) bool{isRequestSignatureV2, isRequestPresignedSignatureV2, isRequestSignatureV4, isRequestPresignedSignatureV4, isRequestJWT, isRequestPostPolicySignatureV4} {
|
|
if hasValidAuth(r) {
|
|
authTypeCount++
|
|
}
|
|
}
|
|
return authTypeCount > 1
|
|
}
|
|
|
|
func (h requestValidityHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
|
// Check for bad components in URL path.
|
|
if hasBadPathComponent(r.URL.Path) {
|
|
writeErrorResponse(context.Background(), w, errorCodes.ToAPIErr(ErrInvalidResourceName), r.URL, guessIsBrowserReq(r))
|
|
return
|
|
}
|
|
// Check for bad components in URL query values.
|
|
for _, vv := range r.URL.Query() {
|
|
for _, v := range vv {
|
|
if hasBadPathComponent(v) {
|
|
writeErrorResponse(context.Background(), w, errorCodes.ToAPIErr(ErrInvalidResourceName), r.URL, guessIsBrowserReq(r))
|
|
return
|
|
}
|
|
}
|
|
}
|
|
if hasMultipleAuth(r) {
|
|
writeErrorResponse(context.Background(), w, errorCodes.ToAPIErr(ErrInvalidRequest), r.URL, guessIsBrowserReq(r))
|
|
return
|
|
}
|
|
h.handler.ServeHTTP(w, r)
|
|
}
|
|
|
|
// To forward the path style requests on a bucket to the right
|
|
// configured server, bucket to IP configuration is obtained
|
|
// from centralized etcd configuration service.
|
|
type bucketForwardingHandler struct {
|
|
fwd *handlers.Forwarder
|
|
handler http.Handler
|
|
}
|
|
|
|
func (f bucketForwardingHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
|
if globalDNSConfig == nil || len(globalDomainNames) == 0 ||
|
|
guessIsHealthCheckReq(r) || guessIsMetricsReq(r) ||
|
|
guessIsRPCReq(r) || isAdminReq(r) {
|
|
f.handler.ServeHTTP(w, r)
|
|
return
|
|
}
|
|
|
|
// For browser requests, when federation is setup we need to
|
|
// specifically handle download and upload for browser requests.
|
|
if guessIsBrowserReq(r) && globalDNSConfig != nil && len(globalDomainNames) > 0 {
|
|
var bucket, _ string
|
|
switch r.Method {
|
|
case http.MethodPut:
|
|
if getRequestAuthType(r) == authTypeJWT {
|
|
bucket, _ = urlPath2BucketObjectName(strings.TrimPrefix(r.URL.Path, minioReservedBucketPath+"/upload"))
|
|
}
|
|
case http.MethodGet:
|
|
if t := r.URL.Query().Get("token"); t != "" {
|
|
bucket, _ = urlPath2BucketObjectName(strings.TrimPrefix(r.URL.Path, minioReservedBucketPath+"/download"))
|
|
} else if getRequestAuthType(r) != authTypeJWT && !strings.HasPrefix(r.URL.Path, minioReservedBucketPath) {
|
|
bucket, _ = urlPath2BucketObjectName(r.URL.Path)
|
|
}
|
|
}
|
|
if bucket != "" {
|
|
sr, err := globalDNSConfig.Get(bucket)
|
|
if err != nil {
|
|
if err == dns.ErrNoEntriesFound {
|
|
writeErrorResponse(context.Background(), w, errorCodes.ToAPIErr(ErrNoSuchBucket), r.URL, guessIsBrowserReq(r))
|
|
} else {
|
|
writeErrorResponse(context.Background(), w, toAPIError(context.Background(), err), r.URL, guessIsBrowserReq(r))
|
|
}
|
|
return
|
|
}
|
|
if globalDomainIPs.Intersection(set.CreateStringSet(getHostsSlice(sr)...)).IsEmpty() {
|
|
r.URL.Scheme = "http"
|
|
if globalIsSSL {
|
|
r.URL.Scheme = "https"
|
|
}
|
|
r.URL.Host = getHostFromSrv(sr)
|
|
f.fwd.ServeHTTP(w, r)
|
|
return
|
|
}
|
|
}
|
|
f.handler.ServeHTTP(w, r)
|
|
return
|
|
}
|
|
|
|
bucket, object := urlPath2BucketObjectName(r.URL.Path)
|
|
// ListBucket requests should be handled at current endpoint as
|
|
// all buckets data can be fetched from here.
|
|
if r.Method == http.MethodGet && bucket == "" && object == "" {
|
|
f.handler.ServeHTTP(w, r)
|
|
return
|
|
}
|
|
|
|
// MakeBucket requests should be handled at current endpoint
|
|
if r.Method == http.MethodPut && bucket != "" && object == "" {
|
|
f.handler.ServeHTTP(w, r)
|
|
return
|
|
}
|
|
|
|
// CopyObject requests should be handled at current endpoint as path style
|
|
// requests have target bucket and object in URI and source details are in
|
|
// header fields
|
|
if r.Method == http.MethodPut && r.Header.Get("X-Amz-Copy-Source") != "" {
|
|
f.handler.ServeHTTP(w, r)
|
|
return
|
|
}
|
|
sr, err := globalDNSConfig.Get(bucket)
|
|
if err != nil {
|
|
if err == dns.ErrNoEntriesFound {
|
|
writeErrorResponse(context.Background(), w, errorCodes.ToAPIErr(ErrNoSuchBucket), r.URL, guessIsBrowserReq(r))
|
|
} else {
|
|
writeErrorResponse(context.Background(), w, toAPIError(context.Background(), err), r.URL, guessIsBrowserReq(r))
|
|
}
|
|
return
|
|
}
|
|
if globalDomainIPs.Intersection(set.CreateStringSet(getHostsSlice(sr)...)).IsEmpty() {
|
|
r.URL.Scheme = "http"
|
|
if globalIsSSL {
|
|
r.URL.Scheme = "https"
|
|
}
|
|
r.URL.Host = getHostFromSrv(sr)
|
|
f.fwd.ServeHTTP(w, r)
|
|
return
|
|
}
|
|
f.handler.ServeHTTP(w, r)
|
|
}
|
|
|
|
// setBucketForwardingHandler middleware forwards the path style requests
|
|
// on a bucket to the right bucket location, bucket to IP configuration
|
|
// is obtained from centralized etcd configuration service.
|
|
func setBucketForwardingHandler(h http.Handler) http.Handler {
|
|
fwd := handlers.NewForwarder(&handlers.Forwarder{
|
|
PassHost: true,
|
|
RoundTripper: NewCustomHTTPTransport(),
|
|
})
|
|
return bucketForwardingHandler{fwd, h}
|
|
}
|
|
|
|
// setRateLimitHandler middleware limits the throughput to h using a
|
|
// rate.Limiter token bucket configured with maxOpenFileLimit and
|
|
// burst set to 1. The request will idle for up to 1*time.Second.
|
|
// If the limiter detects the deadline will be exceeded, the request is
|
|
// canceled immediately.
|
|
func setRateLimitHandler(h http.Handler) http.Handler {
|
|
_, maxLimit, err := sys.GetMaxOpenFileLimit()
|
|
logger.FatalIf(err, "Unable to get maximum open file limit")
|
|
// Burst value is set to 1 to allow only maxOpenFileLimit
|
|
// requests to happen at once.
|
|
l := rate.NewLimiter(rate.Limit(maxLimit), 1)
|
|
return rateLimit{l, h}
|
|
}
|
|
|
|
type rateLimit struct {
|
|
*rate.Limiter
|
|
handler http.Handler
|
|
}
|
|
|
|
func (l rateLimit) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
|
// create a new context from the request with the wait timeout
|
|
ctx, cancel := context.WithTimeout(r.Context(), 1*time.Second)
|
|
defer cancel() // always cancel the context!
|
|
|
|
// Wait errors out if the request cannot be processed within
|
|
// the deadline. time/rate tries to reserve a slot if possible
|
|
// with in the given duration if it's not possible then Wait(ctx)
|
|
// returns an error and we cancel the request with ErrSlowDown
|
|
// error message to the client. This context wait also ensures
|
|
// requests doomed to fail are terminated early, preventing a
|
|
// potential pileup on the server.
|
|
if err := l.Wait(ctx); err != nil {
|
|
// Send an S3 compatible error, SlowDown.
|
|
writeErrorResponse(context.Background(), w, errorCodes.ToAPIErr(ErrSlowDown), r.URL, guessIsBrowserReq(r))
|
|
return
|
|
}
|
|
|
|
l.handler.ServeHTTP(w, r)
|
|
}
|
|
|
|
// customHeaderHandler sets x-amz-request-id, x-minio-deployment-id header.
|
|
// Previously, this value was set right before a response was sent to
|
|
// the client. So, logger and Error response XML were not using this
|
|
// value. This is set here so that this header can be logged as
|
|
// part of the log entry, Error response XML and auditing.
|
|
type customHeaderHandler struct {
|
|
handler http.Handler
|
|
}
|
|
|
|
func addCustomHeaders(h http.Handler) http.Handler {
|
|
return customHeaderHandler{handler: h}
|
|
}
|
|
|
|
func (s customHeaderHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
|
// Set custom headers such as x-amz-request-id and x-minio-deployment-id
|
|
// for each request.
|
|
w.Header().Set(responseRequestIDKey, mustGetRequestID(UTCNow()))
|
|
if globalDeploymentID != "" {
|
|
w.Header().Set(responseDeploymentIDKey, globalDeploymentID)
|
|
}
|
|
s.handler.ServeHTTP(logger.NewResponseWriter(w), r)
|
|
}
|
|
|
|
type securityHeaderHandler struct {
|
|
handler http.Handler
|
|
}
|
|
|
|
func addSecurityHeaders(h http.Handler) http.Handler {
|
|
return securityHeaderHandler{handler: h}
|
|
}
|
|
|
|
func (s securityHeaderHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
|
header := w.Header()
|
|
header.Set("X-XSS-Protection", "1; mode=block") // Prevents against XSS attacks
|
|
header.Set("Content-Security-Policy", "block-all-mixed-content") // prevent mixed (HTTP / HTTPS content)
|
|
s.handler.ServeHTTP(w, r)
|
|
}
|
|
|
|
// criticalErrorHandler handles critical server failures caused by
|
|
// `panic(logger.ErrCritical)` as done by `logger.CriticalIf`.
|
|
//
|
|
// It should be always the first / highest HTTP handler.
|
|
type criticalErrorHandler struct{ handler http.Handler }
|
|
|
|
func (h criticalErrorHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
|
defer func() {
|
|
if err := recover(); err == logger.ErrCritical { // handle
|
|
writeErrorResponse(context.Background(), w, errorCodes.ToAPIErr(ErrInternalError), r.URL, guessIsBrowserReq(r))
|
|
} else if err != nil {
|
|
panic(err) // forward other panic calls
|
|
}
|
|
}()
|
|
h.handler.ServeHTTP(w, r)
|
|
}
|
|
|
|
func setSSETLSHandler(h http.Handler) http.Handler { return sseTLSHandler{h} }
|
|
|
|
// sseTLSHandler enforces certain rules for SSE requests which are made / must be made over TLS.
|
|
type sseTLSHandler struct{ handler http.Handler }
|
|
|
|
func (h sseTLSHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
|
// Deny SSE-C requests if not made over TLS
|
|
if !globalIsSSL && (crypto.SSEC.IsRequested(r.Header) || crypto.SSECopy.IsRequested(r.Header)) {
|
|
if r.Method == http.MethodHead {
|
|
writeErrorResponseHeadersOnly(w, errorCodes.ToAPIErr(ErrInsecureSSECustomerRequest))
|
|
} else {
|
|
writeErrorResponse(context.Background(), w, errorCodes.ToAPIErr(ErrInsecureSSECustomerRequest), r.URL, guessIsBrowserReq(r))
|
|
}
|
|
return
|
|
}
|
|
h.handler.ServeHTTP(w, r)
|
|
}
|