2016-02-16 02:42:39 +01:00
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/*
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* Minio Cloud Storage, (C) 2015 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package main
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2016-02-22 02:57:05 +01:00
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import (
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2016-03-13 01:08:15 +01:00
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"bytes"
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"crypto/md5"
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2016-05-10 23:20:11 +02:00
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"crypto/sha256"
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2016-03-13 01:08:15 +01:00
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"encoding/base64"
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2016-02-22 02:57:05 +01:00
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"encoding/hex"
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2016-03-13 01:08:15 +01:00
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"io/ioutil"
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2016-02-22 02:57:05 +01:00
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"net/http"
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"strings"
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2016-02-16 02:42:39 +01:00
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)
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2016-07-01 23:34:40 +02:00
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// Verify if the request http Header "x-amz-content-sha256" == "UNSIGNED-PAYLOAD"
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func isRequestUnsignedPayload(r *http.Request) bool {
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return r.Header.Get("x-amz-content-sha256") == unsignedPayload
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}
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2016-02-22 02:57:05 +01:00
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// Verify if request has JWT.
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func isRequestJWT(r *http.Request) bool {
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if _, ok := r.Header["Authorization"]; ok {
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if strings.HasPrefix(r.Header.Get("Authorization"), jwtAlgorithm) {
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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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// Verify if request has AWS Signature Version '4'.
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func isRequestSignatureV4(r *http.Request) bool {
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if _, ok := r.Header["Authorization"]; ok {
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if strings.HasPrefix(r.Header.Get("Authorization"), signV4Algorithm) {
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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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// Verify if request has AWS Presignature Version '4'.
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func isRequestPresignedSignatureV4(r *http.Request) bool {
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if _, ok := r.URL.Query()["X-Amz-Credential"]; ok {
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return true
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}
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return false
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}
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// Verify if request has AWS Post policy Signature Version '4'.
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func isRequestPostPolicySignatureV4(r *http.Request) bool {
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if _, ok := r.Header["Content-Type"]; ok {
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accessPolicy: Implement Put, Get, Delete access policy.
This patch implements Get,Put,Delete bucket policies
Supporting - http://docs.aws.amazon.com/AmazonS3/latest/dev/access-policy-language-overview.html
Currently supports following actions.
"*": true,
"s3:*": true,
"s3:GetObject": true,
"s3:ListBucket": true,
"s3:PutObject": true,
"s3:CreateBucket": true,
"s3:GetBucketLocation": true,
"s3:DeleteBucket": true,
"s3:DeleteObject": true,
"s3:AbortMultipartUpload": true,
"s3:ListBucketMultipartUploads": true,
"s3:ListMultipartUploadParts": true,
following conditions for "StringEquals" and "StringNotEquals"
"s3:prefix", "s3:max-keys"
2016-02-04 01:46:56 +01:00
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if strings.Contains(r.Header.Get("Content-Type"), "multipart/form-data") && r.Method == "POST" {
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2016-02-22 02:57:05 +01:00
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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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accessPolicy: Implement Put, Get, Delete access policy.
This patch implements Get,Put,Delete bucket policies
Supporting - http://docs.aws.amazon.com/AmazonS3/latest/dev/access-policy-language-overview.html
Currently supports following actions.
"*": true,
"s3:*": true,
"s3:GetObject": true,
"s3:ListBucket": true,
"s3:PutObject": true,
"s3:CreateBucket": true,
"s3:GetBucketLocation": true,
"s3:DeleteBucket": true,
"s3:DeleteObject": true,
"s3:AbortMultipartUpload": true,
"s3:ListBucketMultipartUploads": true,
"s3:ListMultipartUploadParts": true,
following conditions for "StringEquals" and "StringNotEquals"
"s3:prefix", "s3:max-keys"
2016-02-04 01:46:56 +01:00
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// Authorization type.
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type authType int
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// List of all supported auth types.
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const (
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authTypeUnknown authType = iota
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authTypeAnonymous
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authTypePresigned
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authTypePostPolicy
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authTypeSigned
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authTypeJWT
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)
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// Get request authentication type.
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func getRequestAuthType(r *http.Request) authType {
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if isRequestSignatureV4(r) {
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return authTypeSigned
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} else if isRequestPresignedSignatureV4(r) {
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return authTypePresigned
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} else if isRequestJWT(r) {
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return authTypeJWT
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} else if isRequestPostPolicySignatureV4(r) {
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return authTypePostPolicy
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2016-03-11 02:36:48 +01:00
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} else if _, ok := r.Header["Authorization"]; !ok {
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return authTypeAnonymous
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accessPolicy: Implement Put, Get, Delete access policy.
This patch implements Get,Put,Delete bucket policies
Supporting - http://docs.aws.amazon.com/AmazonS3/latest/dev/access-policy-language-overview.html
Currently supports following actions.
"*": true,
"s3:*": true,
"s3:GetObject": true,
"s3:ListBucket": true,
"s3:PutObject": true,
"s3:CreateBucket": true,
"s3:GetBucketLocation": true,
"s3:DeleteBucket": true,
"s3:DeleteObject": true,
"s3:AbortMultipartUpload": true,
"s3:ListBucketMultipartUploads": true,
"s3:ListMultipartUploadParts": true,
following conditions for "StringEquals" and "StringNotEquals"
"s3:prefix", "s3:max-keys"
2016-02-04 01:46:56 +01:00
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}
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return authTypeUnknown
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}
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2016-03-13 01:08:15 +01:00
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// sum256 calculate sha256 sum for an input byte array
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func sum256(data []byte) []byte {
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2016-05-10 23:20:11 +02:00
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hash := sha256.New()
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2016-03-13 01:08:15 +01:00
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hash.Write(data)
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return hash.Sum(nil)
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}
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// sumMD5 calculate md5 sum for an input byte array
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func sumMD5(data []byte) []byte {
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hash := md5.New()
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hash.Write(data)
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return hash.Sum(nil)
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}
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2016-02-22 02:57:05 +01:00
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// Verify if request has valid AWS Signature Version '4'.
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2016-03-13 01:08:15 +01:00
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func isReqAuthenticated(r *http.Request) (s3Error APIErrorCode) {
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if r == nil {
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return ErrInternalError
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}
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2016-04-29 23:24:10 +02:00
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payload, err := ioutil.ReadAll(r.Body)
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if err != nil {
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2016-03-13 01:08:15 +01:00
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return ErrInternalError
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}
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// Verify Content-Md5, if payload is set.
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if r.Header.Get("Content-Md5") != "" {
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if r.Header.Get("Content-Md5") != base64.StdEncoding.EncodeToString(sumMD5(payload)) {
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return ErrBadDigest
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}
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}
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// Populate back the payload.
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r.Body = ioutil.NopCloser(bytes.NewReader(payload))
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2016-04-02 07:45:27 +02:00
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validateRegion := true // Validate region.
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2016-07-01 23:34:40 +02:00
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var sha256sum string
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2016-07-05 10:04:50 +02:00
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// Skips calculating sha256 on the payload on server,
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// if client requested for it.
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if skipContentSha256Cksum(r) {
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2016-07-01 23:34:40 +02:00
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sha256sum = unsignedPayload
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} else {
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sha256sum = hex.EncodeToString(sum256(payload))
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}
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2016-02-22 02:57:05 +01:00
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if isRequestSignatureV4(r) {
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2016-07-01 23:34:40 +02:00
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return doesSignatureMatch(sha256sum, r, validateRegion)
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2016-02-22 02:57:05 +01:00
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} else if isRequestPresignedSignatureV4(r) {
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2016-07-01 23:34:40 +02:00
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return doesPresignedSignatureMatch(sha256sum, r, validateRegion)
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2016-02-22 02:57:05 +01:00
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}
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2016-03-10 11:24:52 +01:00
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return ErrAccessDenied
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2016-02-22 02:57:05 +01:00
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}
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2016-02-16 02:42:39 +01:00
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// authHandler - handles all the incoming authorization headers and
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// validates them if possible.
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type authHandler struct {
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handler http.Handler
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}
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// setAuthHandler to validate authorization header for the incoming request.
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func setAuthHandler(h http.Handler) http.Handler {
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return authHandler{h}
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}
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2016-02-17 03:50:36 +01:00
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// handler for validating incoming authorization headers.
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2016-02-16 02:42:39 +01:00
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func (a authHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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accessPolicy: Implement Put, Get, Delete access policy.
This patch implements Get,Put,Delete bucket policies
Supporting - http://docs.aws.amazon.com/AmazonS3/latest/dev/access-policy-language-overview.html
Currently supports following actions.
"*": true,
"s3:*": true,
"s3:GetObject": true,
"s3:ListBucket": true,
"s3:PutObject": true,
"s3:CreateBucket": true,
"s3:GetBucketLocation": true,
"s3:DeleteBucket": true,
"s3:DeleteObject": true,
"s3:AbortMultipartUpload": true,
"s3:ListBucketMultipartUploads": true,
"s3:ListMultipartUploadParts": true,
following conditions for "StringEquals" and "StringNotEquals"
"s3:prefix", "s3:max-keys"
2016-02-04 01:46:56 +01:00
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switch getRequestAuthType(r) {
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case authTypeAnonymous, authTypePresigned, authTypeSigned, authTypePostPolicy:
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// Let top level caller validate for anonymous and known
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// signed requests.
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2016-02-17 03:50:36 +01:00
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a.handler.ServeHTTP(w, r)
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return
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accessPolicy: Implement Put, Get, Delete access policy.
This patch implements Get,Put,Delete bucket policies
Supporting - http://docs.aws.amazon.com/AmazonS3/latest/dev/access-policy-language-overview.html
Currently supports following actions.
"*": true,
"s3:*": true,
"s3:GetObject": true,
"s3:ListBucket": true,
"s3:PutObject": true,
"s3:CreateBucket": true,
"s3:GetBucketLocation": true,
"s3:DeleteBucket": true,
"s3:DeleteObject": true,
"s3:AbortMultipartUpload": true,
"s3:ListBucketMultipartUploads": true,
"s3:ListMultipartUploadParts": true,
following conditions for "StringEquals" and "StringNotEquals"
"s3:prefix", "s3:max-keys"
2016-02-04 01:46:56 +01:00
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case authTypeJWT:
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// Validate Authorization header if its valid for JWT request.
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2016-02-18 11:13:52 +01:00
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if !isJWTReqAuthenticated(r) {
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2016-02-16 02:42:39 +01:00
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w.WriteHeader(http.StatusUnauthorized)
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return
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}
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accessPolicy: Implement Put, Get, Delete access policy.
This patch implements Get,Put,Delete bucket policies
Supporting - http://docs.aws.amazon.com/AmazonS3/latest/dev/access-policy-language-overview.html
Currently supports following actions.
"*": true,
"s3:*": true,
"s3:GetObject": true,
"s3:ListBucket": true,
"s3:PutObject": true,
"s3:CreateBucket": true,
"s3:GetBucketLocation": true,
"s3:DeleteBucket": true,
"s3:DeleteObject": true,
"s3:AbortMultipartUpload": true,
"s3:ListBucketMultipartUploads": true,
"s3:ListMultipartUploadParts": true,
following conditions for "StringEquals" and "StringNotEquals"
"s3:prefix", "s3:max-keys"
2016-02-04 01:46:56 +01:00
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a.handler.ServeHTTP(w, r)
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default:
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2016-03-10 11:24:52 +01:00
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writeErrorResponse(w, r, ErrSignatureVersionNotSupported, r.URL.Path)
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accessPolicy: Implement Put, Get, Delete access policy.
This patch implements Get,Put,Delete bucket policies
Supporting - http://docs.aws.amazon.com/AmazonS3/latest/dev/access-policy-language-overview.html
Currently supports following actions.
"*": true,
"s3:*": true,
"s3:GetObject": true,
"s3:ListBucket": true,
"s3:PutObject": true,
"s3:CreateBucket": true,
"s3:GetBucketLocation": true,
"s3:DeleteBucket": true,
"s3:DeleteObject": true,
"s3:AbortMultipartUpload": true,
"s3:ListBucketMultipartUploads": true,
"s3:ListMultipartUploadParts": true,
following conditions for "StringEquals" and "StringNotEquals"
"s3:prefix", "s3:max-keys"
2016-02-04 01:46:56 +01:00
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return
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2016-02-16 02:42:39 +01:00
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}
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}
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