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92 lines
2.7 KiB
92 lines
2.7 KiB
/*
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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 api
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import (
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"errors"
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"net/http"
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"strings"
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"github.com/minio/minio/pkg/auth"
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"github.com/minio/minio/pkg/donut"
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"github.com/minio/minio/pkg/probe"
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)
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const (
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authHeaderPrefix = "AWS4-HMAC-SHA256"
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)
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// StripAccessKeyID - strip only access key id from auth header
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func StripAccessKeyID(ah string) (string, error) {
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if ah == "" {
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return "", errors.New("Missing auth header")
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}
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authFields := strings.Split(strings.TrimSpace(ah), ",")
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if len(authFields) != 3 {
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return "", errors.New("Missing fields in Auth header")
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}
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authPrefixFields := strings.Fields(authFields[0])
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if len(authPrefixFields) != 2 {
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return "", errors.New("Missing fields in Auth header")
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}
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if authPrefixFields[0] != authHeaderPrefix {
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return "", errors.New("Missing fields is Auth header")
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}
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credentials := strings.Split(strings.TrimSpace(authPrefixFields[1]), "=")
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if len(credentials) != 2 {
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return "", errors.New("Missing fields in Auth header")
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}
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if len(strings.Split(strings.TrimSpace(authFields[1]), "=")) != 2 {
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return "", errors.New("Missing fields in Auth header")
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}
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if len(strings.Split(strings.TrimSpace(authFields[2]), "=")) != 2 {
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return "", errors.New("Missing fields in Auth header")
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}
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accessKeyID := strings.Split(strings.TrimSpace(credentials[1]), "/")[0]
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if !auth.IsValidAccessKey(accessKeyID) {
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return "", errors.New("Invalid access key")
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}
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return accessKeyID, nil
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}
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// InitSignatureV4 initializing signature verification
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func InitSignatureV4(req *http.Request) (*donut.Signature, *probe.Error) {
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// strip auth from authorization header
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ah := req.Header.Get("Authorization")
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var accessKeyID string
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{
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var err error
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accessKeyID, err = StripAccessKeyID(ah)
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if err != nil {
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return nil, probe.NewError(err)
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}
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}
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authConfig, err := auth.LoadConfig()
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if err != nil {
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return nil, err.Trace()
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}
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if _, ok := authConfig.Users[accessKeyID]; !ok {
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return nil, probe.NewError(errors.New("AccessID not found"))
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}
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signature := &donut.Signature{
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AccessKeyID: authConfig.Users[accessKeyID].AccessKeyID,
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SecretAccessKey: authConfig.Users[accessKeyID].SecretAccessKey,
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AuthHeader: ah,
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Request: req,
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}
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return signature, nil
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}
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