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124 lines
4.0 KiB
Go
124 lines
4.0 KiB
Go
/*
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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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import (
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"net/http"
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"strings"
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"github.com/minio/minio/pkg/probe"
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)
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const (
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rpcAuthHeaderPrefix = "MINIORPC"
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)
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// getRPCCredentialsFromAuth parse credentials tag from authorization value
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// Authorization:
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// Authorization: MINIORPC Credential=admin/20130524/milkyway/rpc/rpc_request,
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// SignedHeaders=host;x-minio-date, Signature=fe5f80f77d5fa3beca038a248ff027d0445342fe2855ddc963176630326f1024
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func getRPCCredentialsFromAuth(authValue string) ([]string, *probe.Error) {
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if authValue == "" {
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return nil, probe.NewError(errMissingAuthHeaderValue)
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}
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authFields := strings.Split(strings.TrimSpace(authValue), ",")
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if len(authFields) != 3 {
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return nil, probe.NewError(errInvalidAuthHeaderValue)
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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 nil, probe.NewError(errMissingFieldsAuthHeader)
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}
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if authPrefixFields[0] != rpcAuthHeaderPrefix {
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return nil, probe.NewError(errInvalidAuthHeaderPrefix)
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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 nil, probe.NewError(errMissingFieldsCredentialTag)
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}
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if len(strings.Split(strings.TrimSpace(authFields[1]), "=")) != 2 {
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return nil, probe.NewError(errMissingFieldsSignedHeadersTag)
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}
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if len(strings.Split(strings.TrimSpace(authFields[2]), "=")) != 2 {
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return nil, probe.NewError(errMissingFieldsSignatureTag)
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}
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credentialElements := strings.Split(strings.TrimSpace(credentials[1]), "/")
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if len(credentialElements) != 5 {
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return nil, probe.NewError(errCredentialTagMalformed)
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}
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return credentialElements, nil
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}
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// verify if rpcAuthHeader value has valid region
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func isValidRPCRegion(authHeaderValue string) *probe.Error {
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credentialElements, err := getRPCCredentialsFromAuth(authHeaderValue)
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if err != nil {
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return err.Trace()
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}
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region := credentialElements[2]
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if region != "milkyway" {
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return probe.NewError(errInvalidRegion)
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}
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return nil
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}
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// stripRPCAccessKeyID - strip only access key id from auth header
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func stripRPCAccessKeyID(authHeaderValue string) (string, *probe.Error) {
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if err := isValidRegion(authHeaderValue); err != nil {
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return "", err.Trace()
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}
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credentialElements, err := getRPCCredentialsFromAuth(authHeaderValue)
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if err != nil {
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return "", err.Trace()
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}
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accessKeyID := credentialElements[0]
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if !IsValidAccessKey(accessKeyID) {
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return "", probe.NewError(errAccessKeyIDInvalid)
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}
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return accessKeyID, nil
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}
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// initSignatureRPC initializing rpc signature verification
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func initSignatureRPC(req *http.Request) (*rpcSignature, *probe.Error) {
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// strip auth from authorization header
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authHeaderValue := req.Header.Get("Authorization")
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accessKeyID, err := stripAccessKeyID(authHeaderValue)
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if err != nil {
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return nil, err.Trace()
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}
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authConfig, err := LoadConfig()
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if err != nil {
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return nil, err.Trace()
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}
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authFields := strings.Split(strings.TrimSpace(authHeaderValue), ",")
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signedHeaders := strings.Split(strings.Split(strings.TrimSpace(authFields[1]), "=")[1], ";")
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signature := strings.Split(strings.TrimSpace(authFields[2]), "=")[1]
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for _, user := range authConfig.Users {
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if user.AccessKeyID == accessKeyID {
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signature := &rpcSignature{
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AccessKeyID: user.AccessKeyID,
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SecretAccessKey: user.SecretAccessKey,
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Signature: signature,
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SignedHeaders: signedHeaders,
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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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}
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return nil, probe.NewError(errAccessKeyIDInvalid)
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}
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