618 lines
21 KiB
Go
618 lines
21 KiB
Go
/*
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* MinIO Cloud Storage, (C) 2015-2020 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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"context"
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"net/http"
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"strings"
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"sync/atomic"
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"time"
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"github.com/minio/minio-go/v7/pkg/set"
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humanize "github.com/dustin/go-humanize"
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"github.com/minio/minio/cmd/config/dns"
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"github.com/minio/minio/cmd/crypto"
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xhttp "github.com/minio/minio/cmd/http"
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"github.com/minio/minio/cmd/http/stats"
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"github.com/minio/minio/cmd/logger"
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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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func setRequestSizeLimitHandler(h http.Handler) http.Handler {
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return http.HandlerFunc(func(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, requestMaxBodySize)
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h.ServeHTTP(w, r)
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})
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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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// 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 setRequestHeaderSizeLimitHandler(h http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if isHTTPHeaderSizeTooLarge(r.Header) {
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writeErrorResponse(r.Context(), w, errorCodes.ToAPIErr(ErrMetadataTooLarge), r.URL, guessIsBrowserReq(r))
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atomic.AddUint64(&globalHTTPStats.rejectedRequestsHeader, 1)
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return
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}
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h.ServeHTTP(w, r)
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})
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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(strings.ToLower(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 (
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ReservedMetadataPrefix = "X-Minio-Internal-"
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ReservedMetadataPrefixLower = "x-minio-internal-"
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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 filterReservedMetadata(h http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if containsReservedMetadata(r.Header) {
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writeErrorResponse(r.Context(), w, errorCodes.ToAPIErr(ErrUnsupportedMetadata), r.URL, guessIsBrowserReq(r))
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return
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}
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h.ServeHTTP(w, r)
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})
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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(strings.ToLower(key), ReservedMetadataPrefixLower) {
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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 = SlashSeparator + minioReservedBucket
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loginPathPrefix = SlashSeparator + "login"
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)
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func setRedirectHandler(h http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if !shouldProxy() || guessIsRPCReq(r) || guessIsBrowserReq(r) ||
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guessIsHealthCheckReq(r) || guessIsMetricsReq(r) || isAdminReq(r) {
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h.ServeHTTP(w, r)
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return
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}
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// if this server is still initializing, proxy the request
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// to any other online servers to avoid 503 for any incoming
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// API calls.
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if idx := getOnlineProxyEndpointIdx(); idx >= 0 {
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proxyRequest(context.TODO(), w, r, globalProxyEndpoints[idx])
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return
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}
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h.ServeHTTP(w, r)
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})
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}
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func setBrowserRedirectHandler(h http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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// Re-direction is handled specifically for browser requests.
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if globalBrowserEnabled && guessIsBrowserReq(r) {
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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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h.ServeHTTP(w, r)
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})
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}
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func shouldProxy() bool {
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if newObjectLayerFn() == nil {
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return true
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}
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return !globalIAMSys.Initialized()
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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 + SlashSeparator
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}
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if contains([]string{
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SlashSeparator,
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"/webrpc",
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"/login",
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"/favicon-16x16.png",
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"/favicon-32x32.png",
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"/favicon-96x96.png",
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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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aType := getRequestAuthType(req)
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return strings.Contains(req.Header.Get("User-Agent"), "Mozilla") && globalBrowserEnabled &&
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(aType == authTypeJWT || aType == authTypeAnonymous)
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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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req.URL.Path == healthCheckPathPrefix+healthCheckClusterPath ||
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req.URL.Path == healthCheckPathPrefix+healthCheckClusterReadPath)
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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 || aType == authTypeJWT) &&
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req.URL.Path == minioReservedBucketPath+prometheusMetricsPathLegacy ||
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req.URL.Path == minioReservedBucketPath+prometheusMetricsV2ClusterPath ||
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req.URL.Path == minioReservedBucketPath+prometheusMetricsV2NodePath
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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+SlashSeparator)
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}
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// Adds Cache-Control header
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func setBrowserCacheControlHandler(h http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if globalBrowserEnabled && r.Method == http.MethodGet && guessIsBrowserReq(r) {
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// For all browser requests set appropriate Cache-Control policies
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if HasPrefix(r.URL.Path, minioReservedBucketPath+SlashSeparator) {
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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(xhttp.CacheControl, "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(xhttp.CacheControl, "no-store")
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}
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}
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}
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h.ServeHTTP(w, r)
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})
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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, adminPathPrefix)
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}
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// guessIsLoginSTSReq - returns true if incoming request is Login STS user
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func guessIsLoginSTSReq(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.HasPrefix(req.URL.Path, loginPathPrefix) ||
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(req.Method == http.MethodPost && req.URL.Path == SlashSeparator &&
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getRequestAuthType(req) == authTypeSTS)
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}
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// Adds verification for incoming paths.
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func setReservedBucketHandler(h http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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// For all other requests reject access to reserved buckets
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bucketName, _ := request2BucketObjectName(r)
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if isMinioReservedBucket(bucketName) || isMinioMetaBucket(bucketName) {
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if !guessIsRPCReq(r) && !guessIsBrowserReq(r) && !guessIsHealthCheckReq(r) && !guessIsMetricsReq(r) && !isAdminReq(r) {
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writeErrorResponse(r.Context(), 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.ServeHTTP(w, r)
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})
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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(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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// setTimeValidityHandler to validate parsable time over http header
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func setTimeValidityHandler(h http.Handler) http.Handler {
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return http.HandlerFunc(func(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(r.Context(), w, errorCodes.ToAPIErr(errCode), r.URL, guessIsBrowserReq(r))
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atomic.AddUint64(&globalHTTPStats.rejectedRequestsTime, 1)
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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(r.Context(), w, errorCodes.ToAPIErr(ErrRequestTimeTooSkewed), r.URL, guessIsBrowserReq(r))
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atomic.AddUint64(&globalHTTPStats.rejectedRequestsTime, 1)
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return
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}
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}
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h.ServeHTTP(w, r)
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})
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}
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// setHttpStatsHandler sets a http Stats handler to gather HTTP statistics
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func setHTTPStatsHandler(h http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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// Meters s3 connection stats.
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meteredRequest := &stats.IncomingTrafficMeter{ReadCloser: r.Body}
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meteredResponse := &stats.OutgoingTrafficMeter{ResponseWriter: w}
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// Execute the request
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r.Body = meteredRequest
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h.ServeHTTP(meteredResponse, r)
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if strings.HasPrefix(r.URL.Path, minioReservedBucketPath) {
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globalConnStats.incInputBytes(meteredRequest.BytesCount())
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globalConnStats.incOutputBytes(meteredResponse.BytesCount())
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} else {
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globalConnStats.incS3InputBytes(meteredRequest.BytesCount())
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globalConnStats.incS3OutputBytes(meteredResponse.BytesCount())
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}
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})
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}
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// Bad path components to be rejected by the path validity handler.
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const (
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dotdotComponent = ".."
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dotComponent = "."
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)
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// Check if the incoming path has bad path components,
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// such as ".." and "."
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func hasBadPathComponent(path string) bool {
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path = strings.TrimSpace(path)
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for _, p := range strings.Split(path, SlashSeparator) {
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switch strings.TrimSpace(p) {
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case dotdotComponent:
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return true
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case dotComponent:
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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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// Check if client is sending a malicious request.
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func hasMultipleAuth(r *http.Request) bool {
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authTypeCount := 0
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for _, hasValidAuth := range []func(*http.Request) bool{isRequestSignatureV2, isRequestPresignedSignatureV2, isRequestSignatureV4, isRequestPresignedSignatureV4, isRequestJWT, isRequestPostPolicySignatureV4} {
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if hasValidAuth(r) {
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authTypeCount++
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}
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}
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return authTypeCount > 1
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}
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// requestValidityHandler validates all the incoming paths for
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// any malicious requests.
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func setRequestValidityHandler(h http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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// Check for bad components in URL path.
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if hasBadPathComponent(r.URL.Path) {
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writeErrorResponse(r.Context(), w, errorCodes.ToAPIErr(ErrInvalidResourceName), r.URL, guessIsBrowserReq(r))
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atomic.AddUint64(&globalHTTPStats.rejectedRequestsInvalid, 1)
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return
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}
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// Check for bad components in URL query values.
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for _, vv := range r.URL.Query() {
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for _, v := range vv {
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if hasBadPathComponent(v) {
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writeErrorResponse(r.Context(), w, errorCodes.ToAPIErr(ErrInvalidResourceName), r.URL, guessIsBrowserReq(r))
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atomic.AddUint64(&globalHTTPStats.rejectedRequestsInvalid, 1)
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return
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}
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}
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}
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if hasMultipleAuth(r) {
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writeErrorResponse(r.Context(), w, errorCodes.ToAPIErr(ErrInvalidRequest), r.URL, guessIsBrowserReq(r))
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atomic.AddUint64(&globalHTTPStats.rejectedRequestsInvalid, 1)
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return
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}
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h.ServeHTTP(w, r)
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})
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}
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// setBucketForwardingHandler middleware forwards the path style requests
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// on a bucket to the right bucket location, bucket to IP configuration
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// is obtained from centralized etcd configuration service.
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func setBucketForwardingHandler(h http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if globalDNSConfig == nil || len(globalDomainNames) == 0 || !globalBucketFederation ||
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guessIsHealthCheckReq(r) || guessIsMetricsReq(r) ||
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guessIsRPCReq(r) || guessIsLoginSTSReq(r) || isAdminReq(r) {
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h.ServeHTTP(w, r)
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return
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}
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// For browser requests, when federation is setup we need to
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// specifically handle download and upload for browser requests.
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if guessIsBrowserReq(r) {
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var bucket, _ string
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switch r.Method {
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case http.MethodPut:
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if getRequestAuthType(r) == authTypeJWT {
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bucket, _ = path2BucketObjectWithBasePath(minioReservedBucketPath+"/upload", r.URL.Path)
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}
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case http.MethodGet:
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if t := r.URL.Query().Get("token"); t != "" {
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bucket, _ = path2BucketObjectWithBasePath(minioReservedBucketPath+"/download", r.URL.Path)
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} else if getRequestAuthType(r) != authTypeJWT && !strings.HasPrefix(r.URL.Path, minioReservedBucketPath) {
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bucket, _ = request2BucketObjectName(r)
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}
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}
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if bucket == "" {
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h.ServeHTTP(w, r)
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return
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}
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sr, err := globalDNSConfig.Get(bucket)
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if err != nil {
|
|
if err == dns.ErrNoEntriesFound {
|
|
writeErrorResponse(r.Context(), w, errorCodes.ToAPIErr(ErrNoSuchBucket),
|
|
r.URL, guessIsBrowserReq(r))
|
|
} else {
|
|
writeErrorResponse(r.Context(), w, toAPIError(r.Context(), err),
|
|
r.URL, guessIsBrowserReq(r))
|
|
}
|
|
return
|
|
}
|
|
if globalDomainIPs.Intersection(set.CreateStringSet(getHostsSlice(sr)...)).IsEmpty() {
|
|
r.URL.Scheme = "http"
|
|
if globalIsTLS {
|
|
r.URL.Scheme = "https"
|
|
}
|
|
r.URL.Host = getHostFromSrv(sr)
|
|
// Make sure we remove any existing headers before
|
|
// proxying the request to another node.
|
|
for k := range w.Header() {
|
|
w.Header().Del(k)
|
|
}
|
|
globalForwarder.ServeHTTP(w, r)
|
|
return
|
|
}
|
|
h.ServeHTTP(w, r)
|
|
return
|
|
}
|
|
|
|
bucket, object := request2BucketObjectName(r)
|
|
|
|
// Requests in federated setups for STS type calls which are
|
|
// performed at '/' resource should be routed by the muxer,
|
|
// the assumption is simply such that requests without a bucket
|
|
// in a federated setup cannot be proxied, so serve them at
|
|
// current server.
|
|
if bucket == "" {
|
|
h.ServeHTTP(w, r)
|
|
return
|
|
}
|
|
|
|
// MakeBucket requests should be handled at current endpoint
|
|
if r.Method == http.MethodPut && bucket != "" && object == "" && r.URL.RawQuery == "" {
|
|
h.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(xhttp.AmzCopySource) != "" {
|
|
bucket, object = path2BucketObject(r.Header.Get(xhttp.AmzCopySource))
|
|
if bucket == "" || object == "" {
|
|
h.ServeHTTP(w, r)
|
|
return
|
|
}
|
|
}
|
|
sr, err := globalDNSConfig.Get(bucket)
|
|
if err != nil {
|
|
if err == dns.ErrNoEntriesFound {
|
|
writeErrorResponse(r.Context(), w, errorCodes.ToAPIErr(ErrNoSuchBucket), r.URL, guessIsBrowserReq(r))
|
|
} else {
|
|
writeErrorResponse(r.Context(), w, toAPIError(r.Context(), err), r.URL, guessIsBrowserReq(r))
|
|
}
|
|
return
|
|
}
|
|
if globalDomainIPs.Intersection(set.CreateStringSet(getHostsSlice(sr)...)).IsEmpty() {
|
|
r.URL.Scheme = "http"
|
|
if globalIsTLS {
|
|
r.URL.Scheme = "https"
|
|
}
|
|
r.URL.Host = getHostFromSrv(sr)
|
|
// Make sure we remove any existing headers before
|
|
// proxying the request to another node.
|
|
for k := range w.Header() {
|
|
w.Header().Del(k)
|
|
}
|
|
globalForwarder.ServeHTTP(w, r)
|
|
return
|
|
}
|
|
h.ServeHTTP(w, r)
|
|
})
|
|
}
|
|
|
|
// customHeaderHandler sets x-amz-request-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.
|
|
func addCustomHeaders(h http.Handler) http.Handler {
|
|
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
|
// Set custom headers such as x-amz-request-id for each request.
|
|
w.Header().Set(xhttp.AmzRequestID, mustGetRequestID(UTCNow()))
|
|
h.ServeHTTP(logger.NewResponseWriter(w), r)
|
|
})
|
|
}
|
|
|
|
func addSecurityHeaders(h http.Handler) http.Handler {
|
|
return http.HandlerFunc(func(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)
|
|
h.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(r.Context(), w, errorCodes.ToAPIErr(ErrInternalError), r.URL, guessIsBrowserReq(r))
|
|
return
|
|
} else if err != nil {
|
|
panic(err) // forward other panic calls
|
|
}
|
|
}()
|
|
h.handler.ServeHTTP(w, r)
|
|
}
|
|
|
|
// sseTLSHandler enforces certain rules for SSE requests which are made / must be made over TLS.
|
|
func setSSETLSHandler(h http.Handler) http.Handler {
|
|
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
|
// Deny SSE-C requests if not made over TLS
|
|
if !globalIsTLS && (crypto.SSEC.IsRequested(r.Header) || crypto.SSECopy.IsRequested(r.Header)) {
|
|
if r.Method == http.MethodHead {
|
|
writeErrorResponseHeadersOnly(w, errorCodes.ToAPIErr(ErrInsecureSSECustomerRequest))
|
|
} else {
|
|
writeErrorResponse(r.Context(), w, errorCodes.ToAPIErr(ErrInsecureSSECustomerRequest), r.URL, guessIsBrowserReq(r))
|
|
}
|
|
return
|
|
}
|
|
h.ServeHTTP(w, r)
|
|
})
|
|
}
|