mirror of
https://github.com/pgsty/minio.git
synced 2026-08-10 00:03:29 +03:00
Sign V2 support.
This commit is contained in:
Harshavardhana
@@ -0,0 +1,326 @@
|
||||
/*
|
||||
* Minio Cloud Storage, (C) 2016 Minio, Inc.
|
||||
*
|
||||
* Licensed under the Apache License, Version 2.0 (the "License");
|
||||
* you may not use this file except in compliance with the License.
|
||||
* You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
|
||||
package cmd
|
||||
|
||||
import (
|
||||
"crypto/hmac"
|
||||
"crypto/sha1"
|
||||
"encoding/base64"
|
||||
"fmt"
|
||||
"net/http"
|
||||
"sort"
|
||||
"strconv"
|
||||
"strings"
|
||||
"time"
|
||||
)
|
||||
|
||||
// Signature and API related constants.
|
||||
const (
|
||||
signV2Algorithm = "AWS"
|
||||
)
|
||||
|
||||
// AWS S3 Signature V2 calculation rule is give here:
|
||||
// http://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAuthentication.html#RESTAuthenticationStringToSign
|
||||
|
||||
// Whitelist resource list that will be used in query string for signature-V2 calculation.
|
||||
var resourceList = []string{
|
||||
"acl",
|
||||
"delete",
|
||||
"lifecycle",
|
||||
"location",
|
||||
"logging",
|
||||
"notification",
|
||||
"partNumber",
|
||||
"policy",
|
||||
"requestPayment",
|
||||
"torrent",
|
||||
"uploadId",
|
||||
"uploads",
|
||||
"versionId",
|
||||
"versioning",
|
||||
"versions",
|
||||
"website",
|
||||
}
|
||||
|
||||
// TODO add post policy signature.
|
||||
|
||||
// doesPresignV2SignatureMatch - Verify query headers with presigned signature
|
||||
// - http://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAuthentication.html#RESTAuthenticationQueryStringAuth
|
||||
// returns ErrNone if matches. S3 errors otherwise.
|
||||
func doesPresignV2SignatureMatch(r *http.Request) APIErrorCode {
|
||||
// Access credentials.
|
||||
cred := serverConfig.GetCredential()
|
||||
|
||||
// url.RawPath will be valid if path has any encoded characters, if not it will
|
||||
// be empty - in which case we need to consider url.Path (bug in net/http?)
|
||||
encodedResource := r.URL.RawPath
|
||||
encodedQuery := r.URL.RawQuery
|
||||
if encodedResource == "" {
|
||||
splits := strings.Split(r.URL.Path, "?")
|
||||
if len(splits) > 0 {
|
||||
encodedResource = splits[0]
|
||||
}
|
||||
}
|
||||
queries := strings.Split(encodedQuery, "&")
|
||||
var filteredQueries []string
|
||||
var gotSignature string
|
||||
var expires string
|
||||
var accessKey string
|
||||
for _, query := range queries {
|
||||
keyval := strings.Split(query, "=")
|
||||
switch keyval[0] {
|
||||
case "AWSAccessKeyId":
|
||||
accessKey = keyval[1]
|
||||
case "Signature":
|
||||
gotSignature = keyval[1]
|
||||
case "Expires":
|
||||
expires = keyval[1]
|
||||
default:
|
||||
filteredQueries = append(filteredQueries, query)
|
||||
}
|
||||
}
|
||||
|
||||
if accessKey == "" {
|
||||
return ErrInvalidQueryParams
|
||||
}
|
||||
|
||||
// Validate if access key id same.
|
||||
if accessKey != cred.AccessKeyID {
|
||||
return ErrInvalidAccessKeyID
|
||||
}
|
||||
|
||||
// Make sure the request has not expired.
|
||||
expiresInt, err := strconv.ParseInt(expires, 10, 64)
|
||||
if err != nil {
|
||||
return ErrMalformedExpires
|
||||
}
|
||||
|
||||
if expiresInt < time.Now().UTC().Unix() {
|
||||
return ErrExpiredPresignRequest
|
||||
}
|
||||
|
||||
expectedSignature := preSignatureV2(r.Method, encodedResource, strings.Join(filteredQueries, "&"), r.Header, expires)
|
||||
if gotSignature != getURLEncodedName(expectedSignature) {
|
||||
return ErrSignatureDoesNotMatch
|
||||
}
|
||||
|
||||
return ErrNone
|
||||
}
|
||||
|
||||
// Authorization = "AWS" + " " + AWSAccessKeyId + ":" + Signature;
|
||||
// Signature = Base64( HMAC-SHA1( YourSecretAccessKeyID, UTF-8-Encoding-Of( StringToSign ) ) );
|
||||
//
|
||||
// StringToSign = HTTP-Verb + "\n" +
|
||||
// Content-Md5 + "\n" +
|
||||
// Content-Type + "\n" +
|
||||
// Date + "\n" +
|
||||
// CanonicalizedProtocolHeaders +
|
||||
// CanonicalizedResource;
|
||||
//
|
||||
// CanonicalizedResource = [ "/" + Bucket ] +
|
||||
// <HTTP-Request-URI, from the protocol name up to the query string> +
|
||||
// [ subresource, if present. For example "?acl", "?location", "?logging", or "?torrent"];
|
||||
//
|
||||
// CanonicalizedProtocolHeaders = <described below>
|
||||
|
||||
// doesSignV2Match - Verify authorization header with calculated header in accordance with
|
||||
// - http://docs.aws.amazon.com/AmazonS3/latest/dev/auth-request-sig-v2.html
|
||||
// returns true if matches, false otherwise. if error is not nil then it is always false
|
||||
|
||||
func validateV2AuthHeader(v2Auth string) APIErrorCode {
|
||||
if v2Auth == "" {
|
||||
return ErrAuthHeaderEmpty
|
||||
}
|
||||
// Verify if the header algorithm is supported or not.
|
||||
if !strings.HasPrefix(v2Auth, signV2Algorithm) {
|
||||
return ErrSignatureVersionNotSupported
|
||||
}
|
||||
|
||||
// below is V2 Signed Auth header format, splitting on `space` (after the `AWS` string).
|
||||
// Authorization = "AWS" + " " + AWSAccessKeyId + ":" + Signature
|
||||
authFields := strings.Split(v2Auth, " ")
|
||||
if len(authFields) != 2 {
|
||||
return ErrMissingFields
|
||||
}
|
||||
|
||||
// Then will be splitting on ":", this will seprate `AWSAccessKeyId` and `Signature` string.
|
||||
keySignFields := strings.Split(strings.TrimSpace(authFields[1]), ":")
|
||||
if len(keySignFields) != 2 {
|
||||
return ErrMissingFields
|
||||
}
|
||||
|
||||
// Access credentials.
|
||||
cred := serverConfig.GetCredential()
|
||||
if keySignFields[0] != cred.AccessKeyID {
|
||||
return ErrInvalidAccessKeyID
|
||||
}
|
||||
|
||||
return ErrNone
|
||||
}
|
||||
|
||||
func doesSignV2Match(r *http.Request) APIErrorCode {
|
||||
v2Auth := r.Header.Get("Authorization")
|
||||
|
||||
if apiError := validateV2AuthHeader(v2Auth); apiError != ErrNone {
|
||||
return apiError
|
||||
}
|
||||
|
||||
// url.RawPath will be valid if path has any encoded characters, if not it will
|
||||
// be empty - in which case we need to consider url.Path (bug in net/http?)
|
||||
encodedResource := r.URL.RawPath
|
||||
encodedQuery := r.URL.RawQuery
|
||||
if encodedResource == "" {
|
||||
splits := strings.Split(r.URL.Path, "?")
|
||||
if len(splits) > 0 {
|
||||
encodedResource = splits[0]
|
||||
}
|
||||
}
|
||||
|
||||
expectedAuth := signatureV2(r.Method, encodedResource, encodedQuery, r.Header)
|
||||
if v2Auth != expectedAuth {
|
||||
return ErrSignatureDoesNotMatch
|
||||
}
|
||||
|
||||
return ErrNone
|
||||
}
|
||||
|
||||
// Return signature-v2 for the presigned request.
|
||||
func preSignatureV2(method string, encodedResource string, encodedQuery string, headers http.Header, expires string) string {
|
||||
cred := serverConfig.GetCredential()
|
||||
|
||||
stringToSign := presignV2STS(method, encodedResource, encodedQuery, headers, expires)
|
||||
hm := hmac.New(sha1.New, []byte(cred.SecretAccessKey))
|
||||
hm.Write([]byte(stringToSign))
|
||||
signature := base64.StdEncoding.EncodeToString(hm.Sum(nil))
|
||||
return signature
|
||||
}
|
||||
|
||||
// Return signature-v2 authrization header.
|
||||
func signatureV2(method string, encodedResource string, encodedQuery string, headers http.Header) string {
|
||||
cred := serverConfig.GetCredential()
|
||||
|
||||
stringToSign := signV2STS(method, encodedResource, encodedQuery, headers)
|
||||
|
||||
hm := hmac.New(sha1.New, []byte(cred.SecretAccessKey))
|
||||
hm.Write([]byte(stringToSign))
|
||||
signature := base64.StdEncoding.EncodeToString(hm.Sum(nil))
|
||||
return fmt.Sprintf("%s %s:%s", signV2Algorithm, cred.AccessKeyID, signature)
|
||||
}
|
||||
|
||||
// Return canonical headers.
|
||||
func canonicalizedAmzHeadersV2(headers http.Header) string {
|
||||
var keys []string
|
||||
keyval := make(map[string]string)
|
||||
for key := range headers {
|
||||
lkey := strings.ToLower(key)
|
||||
if !strings.HasPrefix(lkey, "x-amz-") {
|
||||
continue
|
||||
}
|
||||
keys = append(keys, lkey)
|
||||
keyval[lkey] = strings.Join(headers[key], ",")
|
||||
}
|
||||
sort.Strings(keys)
|
||||
var canonicalHeaders []string
|
||||
for _, key := range keys {
|
||||
canonicalHeaders = append(canonicalHeaders, key+":"+keyval[key])
|
||||
}
|
||||
return strings.Join(canonicalHeaders, "\n")
|
||||
}
|
||||
|
||||
// Return canonical resource string.
|
||||
func canonicalizedResourceV2(encodedPath string, encodedQuery string) string {
|
||||
queries := strings.Split(encodedQuery, "&")
|
||||
keyval := make(map[string]string)
|
||||
for _, query := range queries {
|
||||
key := query
|
||||
val := ""
|
||||
index := strings.Index(query, "=")
|
||||
if index != -1 {
|
||||
key = query[:index]
|
||||
val = query[index+1:]
|
||||
}
|
||||
keyval[key] = val
|
||||
}
|
||||
var canonicalQueries []string
|
||||
for _, key := range resourceList {
|
||||
val, ok := keyval[key]
|
||||
if !ok {
|
||||
continue
|
||||
}
|
||||
if val == "" {
|
||||
canonicalQueries = append(canonicalQueries, key)
|
||||
continue
|
||||
}
|
||||
canonicalQueries = append(canonicalQueries, key+"="+val)
|
||||
}
|
||||
if len(canonicalQueries) == 0 {
|
||||
return encodedPath
|
||||
}
|
||||
// the queries will be already sorted as resourceList is sorted.
|
||||
return encodedPath + "?" + strings.Join(canonicalQueries, "&")
|
||||
}
|
||||
|
||||
// Return string to sign for authz header calculation.
|
||||
func signV2STS(method string, encodedResource string, encodedQuery string, headers http.Header) string {
|
||||
canonicalHeaders := canonicalizedAmzHeadersV2(headers)
|
||||
if len(canonicalHeaders) > 0 {
|
||||
canonicalHeaders += "\n"
|
||||
}
|
||||
|
||||
// From the Amazon docs:
|
||||
//
|
||||
// StringToSign = HTTP-Verb + "\n" +
|
||||
// Content-Md5 + "\n" +
|
||||
// Content-Type + "\n" +
|
||||
// Date + "\n" +
|
||||
// CanonicalizedProtocolHeaders +
|
||||
// CanonicalizedResource;
|
||||
stringToSign := strings.Join([]string{
|
||||
method,
|
||||
headers.Get("Content-MD5"),
|
||||
headers.Get("Content-Type"),
|
||||
headers.Get("Date"),
|
||||
canonicalHeaders,
|
||||
}, "\n") + canonicalizedResourceV2(encodedResource, encodedQuery)
|
||||
|
||||
return stringToSign
|
||||
}
|
||||
|
||||
// Return string to sign for pre-sign signature calculation.
|
||||
func presignV2STS(method string, encodedResource string, encodedQuery string, headers http.Header, expires string) string {
|
||||
canonicalHeaders := canonicalizedAmzHeadersV2(headers)
|
||||
if len(canonicalHeaders) > 0 {
|
||||
canonicalHeaders += "\n"
|
||||
}
|
||||
|
||||
// From the Amazon docs:
|
||||
//
|
||||
// StringToSign = HTTP-Verb + "\n" +
|
||||
// Content-Md5 + "\n" +
|
||||
// Content-Type + "\n" +
|
||||
// Expires + "\n" +
|
||||
// CanonicalizedProtocolHeaders +
|
||||
// CanonicalizedResource;
|
||||
stringToSign := strings.Join([]string{
|
||||
method,
|
||||
headers.Get("Content-MD5"),
|
||||
headers.Get("Content-Type"),
|
||||
expires,
|
||||
canonicalHeaders,
|
||||
}, "\n") + canonicalizedResourceV2(encodedResource, encodedQuery)
|
||||
return stringToSign
|
||||
}
|
||||
Reference in New Issue
Block a user