66 lines
2.0 KiB
Go
66 lines
2.0 KiB
Go
/*
|
|
*
|
|
* Copyright 2020 gRPC authors.
|
|
*
|
|
* 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 credentials defines APIs for parsing SPIFFE ID.
|
|
//
|
|
// All APIs in this package are experimental.
|
|
package credentials
|
|
|
|
import (
|
|
"crypto/tls"
|
|
"net/url"
|
|
|
|
"google.golang.org/grpc/grpclog"
|
|
)
|
|
|
|
var logger = grpclog.Component("credentials")
|
|
|
|
// SPIFFEIDFromState parses the SPIFFE ID from State. If the SPIFFE ID format
|
|
// is invalid, return nil with warning.
|
|
func SPIFFEIDFromState(state tls.ConnectionState) *url.URL {
|
|
if len(state.PeerCertificates) == 0 || len(state.PeerCertificates[0].URIs) == 0 {
|
|
return nil
|
|
}
|
|
var spiffeID *url.URL
|
|
for _, uri := range state.PeerCertificates[0].URIs {
|
|
if uri == nil || uri.Scheme != "spiffe" || uri.Opaque != "" || (uri.User != nil && uri.User.Username() != "") {
|
|
continue
|
|
}
|
|
// From this point, we assume the uri is intended for a SPIFFE ID.
|
|
if len(uri.String()) > 2048 {
|
|
logger.Warning("invalid SPIFFE ID: total ID length larger than 2048 bytes")
|
|
return nil
|
|
}
|
|
if len(uri.Host) == 0 || len(uri.RawPath) == 0 || len(uri.Path) == 0 {
|
|
logger.Warning("invalid SPIFFE ID: domain or workload ID is empty")
|
|
return nil
|
|
}
|
|
if len(uri.Host) > 255 {
|
|
logger.Warning("invalid SPIFFE ID: domain length larger than 255 characters")
|
|
return nil
|
|
}
|
|
// A valid SPIFFE certificate can only have exactly one URI SAN field.
|
|
if len(state.PeerCertificates[0].URIs) > 1 {
|
|
logger.Warning("invalid SPIFFE ID: multiple URI SANs")
|
|
return nil
|
|
}
|
|
spiffeID = uri
|
|
}
|
|
return spiffeID
|
|
}
|