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355 lines
10 KiB
355 lines
10 KiB
/*
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* Minio Cloud Storage, (C) 2016 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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"crypto/hmac"
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"crypto/sha1"
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"encoding/base64"
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"fmt"
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"net/http"
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"net/url"
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"sort"
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"strconv"
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"strings"
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"time"
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)
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// Signature and API related constants.
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const (
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signV2Algorithm = "AWS"
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)
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// AWS S3 Signature V2 calculation rule is give here:
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// http://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAuthentication.html#RESTAuthenticationStringToSign
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// Whitelist resource list that will be used in query string for signature-V2 calculation.
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// The list should be alphabetically sorted
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var resourceList = []string{
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"acl",
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"delete",
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"lifecycle",
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"location",
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"logging",
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"notification",
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"partNumber",
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"policy",
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"requestPayment",
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"response-cache-control",
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"response-content-disposition",
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"response-content-encoding",
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"response-content-language",
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"response-content-type",
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"response-expires",
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"torrent",
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"uploadId",
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"uploads",
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"versionId",
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"versioning",
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"versions",
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"website",
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}
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func doesPolicySignatureV2Match(formValues map[string]string) APIErrorCode {
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cred := serverConfig.GetCredential()
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accessKey := formValues["Awsaccesskeyid"]
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if accessKey != cred.AccessKey {
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return ErrInvalidAccessKeyID
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}
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signature := formValues["Signature"]
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policy := formValues["Policy"]
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if signature != calculateSignatureV2(policy, cred.SecretKey) {
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return ErrSignatureDoesNotMatch
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}
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return ErrNone
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}
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// doesPresignV2SignatureMatch - Verify query headers with presigned signature
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// - http://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAuthentication.html#RESTAuthenticationQueryStringAuth
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// returns ErrNone if matches. S3 errors otherwise.
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func doesPresignV2SignatureMatch(r *http.Request) APIErrorCode {
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// Access credentials.
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cred := serverConfig.GetCredential()
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// url.RawPath will be valid if path has any encoded characters, if not it will
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// be empty - in which case we need to consider url.Path (bug in net/http?)
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encodedResource := r.URL.RawPath
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encodedQuery := r.URL.RawQuery
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if encodedResource == "" {
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splits := strings.Split(r.URL.Path, "?")
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if len(splits) > 0 {
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encodedResource = splits[0]
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}
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}
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queries := strings.Split(encodedQuery, "&")
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var filteredQueries []string
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var gotSignature string
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var expires string
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var accessKey string
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var err error
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for _, query := range queries {
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keyval := strings.Split(query, "=")
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switch keyval[0] {
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case "AWSAccessKeyId":
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accessKey, err = url.QueryUnescape(keyval[1])
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case "Signature":
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gotSignature, err = url.QueryUnescape(keyval[1])
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case "Expires":
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expires, err = url.QueryUnescape(keyval[1])
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default:
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filteredQueries = append(filteredQueries, query)
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}
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}
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// Check if the query unescaped properly.
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if err != nil {
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errorIf(err, "Unable to unescape query values", queries)
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return ErrInvalidQueryParams
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}
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// Invalid access key.
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if accessKey == "" {
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return ErrInvalidQueryParams
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}
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// Validate if access key id same.
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if accessKey != cred.AccessKey {
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return ErrInvalidAccessKeyID
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}
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// Make sure the request has not expired.
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expiresInt, err := strconv.ParseInt(expires, 10, 64)
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if err != nil {
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return ErrMalformedExpires
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}
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// Check if the presigned URL has expired.
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if expiresInt < time.Now().UTC().Unix() {
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return ErrExpiredPresignRequest
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}
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expectedSignature := preSignatureV2(r.Method, encodedResource, strings.Join(filteredQueries, "&"), r.Header, expires)
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if gotSignature != expectedSignature {
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return ErrSignatureDoesNotMatch
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}
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return ErrNone
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}
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// Authorization = "AWS" + " " + AWSAccessKeyId + ":" + Signature;
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// Signature = Base64( HMAC-SHA1( YourSecretKey, UTF-8-Encoding-Of( StringToSign ) ) );
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//
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// StringToSign = HTTP-Verb + "\n" +
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// Content-Md5 + "\n" +
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// Content-Type + "\n" +
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// Date + "\n" +
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// CanonicalizedProtocolHeaders +
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// CanonicalizedResource;
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//
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// CanonicalizedResource = [ "/" + Bucket ] +
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// <HTTP-Request-URI, from the protocol name up to the query string> +
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// [ subresource, if present. For example "?acl", "?location", "?logging", or "?torrent"];
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//
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// CanonicalizedProtocolHeaders = <described below>
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// doesSignV2Match - Verify authorization header with calculated header in accordance with
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// - http://docs.aws.amazon.com/AmazonS3/latest/dev/auth-request-sig-v2.html
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// returns true if matches, false otherwise. if error is not nil then it is always false
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func validateV2AuthHeader(v2Auth string) APIErrorCode {
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if v2Auth == "" {
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return ErrAuthHeaderEmpty
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}
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// Verify if the header algorithm is supported or not.
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if !strings.HasPrefix(v2Auth, signV2Algorithm) {
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return ErrSignatureVersionNotSupported
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}
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// below is V2 Signed Auth header format, splitting on `space` (after the `AWS` string).
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// Authorization = "AWS" + " " + AWSAccessKeyId + ":" + Signature
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authFields := strings.Split(v2Auth, " ")
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if len(authFields) != 2 {
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return ErrMissingFields
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}
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// Then will be splitting on ":", this will seprate `AWSAccessKeyId` and `Signature` string.
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keySignFields := strings.Split(strings.TrimSpace(authFields[1]), ":")
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if len(keySignFields) != 2 {
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return ErrMissingFields
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}
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// Access credentials.
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cred := serverConfig.GetCredential()
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if keySignFields[0] != cred.AccessKey {
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return ErrInvalidAccessKeyID
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}
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return ErrNone
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}
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func doesSignV2Match(r *http.Request) APIErrorCode {
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v2Auth := r.Header.Get("Authorization")
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if apiError := validateV2AuthHeader(v2Auth); apiError != ErrNone {
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return apiError
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}
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// Encode path:
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// url.RawPath will be valid if path has any encoded characters, if not it will
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// be empty - in which case we need to consider url.Path (bug in net/http?)
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encodedResource := r.URL.RawPath
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if encodedResource == "" {
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splits := strings.Split(r.URL.Path, "?")
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if len(splits) > 0 {
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encodedResource = getURLEncodedName(splits[0])
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}
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}
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// Encode query strings
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encodedQuery := r.URL.Query().Encode()
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expectedAuth := signatureV2(r.Method, encodedResource, encodedQuery, r.Header)
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if v2Auth != expectedAuth {
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return ErrSignatureDoesNotMatch
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}
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return ErrNone
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}
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func calculateSignatureV2(stringToSign string, secret string) string {
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hm := hmac.New(sha1.New, []byte(secret))
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hm.Write([]byte(stringToSign))
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return base64.StdEncoding.EncodeToString(hm.Sum(nil))
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}
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// Return signature-v2 for the presigned request.
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func preSignatureV2(method string, encodedResource string, encodedQuery string, headers http.Header, expires string) string {
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cred := serverConfig.GetCredential()
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stringToSign := presignV2STS(method, encodedResource, encodedQuery, headers, expires)
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return calculateSignatureV2(stringToSign, cred.SecretKey)
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}
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// Return signature-v2 authrization header.
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func signatureV2(method string, encodedResource string, encodedQuery string, headers http.Header) string {
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cred := serverConfig.GetCredential()
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stringToSign := signV2STS(method, encodedResource, encodedQuery, headers)
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signature := calculateSignatureV2(stringToSign, cred.SecretKey)
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return fmt.Sprintf("%s %s:%s", signV2Algorithm, cred.AccessKey, signature)
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}
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// Return canonical headers.
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func canonicalizedAmzHeadersV2(headers http.Header) string {
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var keys []string
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keyval := make(map[string]string)
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for key := range headers {
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lkey := strings.ToLower(key)
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if !strings.HasPrefix(lkey, "x-amz-") {
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continue
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}
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keys = append(keys, lkey)
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keyval[lkey] = strings.Join(headers[key], ",")
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}
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sort.Strings(keys)
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var canonicalHeaders []string
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for _, key := range keys {
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canonicalHeaders = append(canonicalHeaders, key+":"+keyval[key])
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}
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return strings.Join(canonicalHeaders, "\n")
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}
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// Return canonical resource string.
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func canonicalizedResourceV2(encodedPath string, encodedQuery string) string {
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queries := strings.Split(encodedQuery, "&")
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keyval := make(map[string]string)
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for _, query := range queries {
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key := query
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val := ""
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index := strings.Index(query, "=")
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if index != -1 {
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key = query[:index]
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val = query[index+1:]
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}
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keyval[key] = val
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}
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var canonicalQueries []string
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for _, key := range resourceList {
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val, ok := keyval[key]
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if !ok {
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continue
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}
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if val == "" {
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canonicalQueries = append(canonicalQueries, key)
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continue
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}
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canonicalQueries = append(canonicalQueries, key+"="+val)
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}
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if len(canonicalQueries) == 0 {
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return encodedPath
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}
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// the queries will be already sorted as resourceList is sorted.
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return encodedPath + "?" + strings.Join(canonicalQueries, "&")
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}
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// Return string to sign for authz header calculation.
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func signV2STS(method string, encodedResource string, encodedQuery string, headers http.Header) string {
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canonicalHeaders := canonicalizedAmzHeadersV2(headers)
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if len(canonicalHeaders) > 0 {
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canonicalHeaders += "\n"
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}
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// From the Amazon docs:
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//
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// StringToSign = HTTP-Verb + "\n" +
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// Content-Md5 + "\n" +
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// Content-Type + "\n" +
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// Date + "\n" +
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// CanonicalizedProtocolHeaders +
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// CanonicalizedResource;
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stringToSign := strings.Join([]string{
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method,
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headers.Get("Content-MD5"),
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headers.Get("Content-Type"),
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headers.Get("Date"),
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canonicalHeaders,
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}, "\n") + canonicalizedResourceV2(encodedResource, encodedQuery)
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return stringToSign
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}
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// Return string to sign for pre-sign signature calculation.
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func presignV2STS(method string, encodedResource string, encodedQuery string, headers http.Header, expires string) string {
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canonicalHeaders := canonicalizedAmzHeadersV2(headers)
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if len(canonicalHeaders) > 0 {
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canonicalHeaders += "\n"
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}
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// From the Amazon docs:
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//
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// StringToSign = HTTP-Verb + "\n" +
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// Content-Md5 + "\n" +
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// Content-Type + "\n" +
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// Expires + "\n" +
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// CanonicalizedProtocolHeaders +
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// CanonicalizedResource;
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stringToSign := strings.Join([]string{
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method,
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headers.Get("Content-MD5"),
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headers.Get("Content-Type"),
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expires,
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canonicalHeaders,
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}, "\n") + canonicalizedResourceV2(encodedResource, encodedQuery)
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return stringToSign
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}
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