mirror of
https://github.com/distribution/distribution.git
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102 lines
3.6 KiB
Go
102 lines
3.6 KiB
Go
/*
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* Copyright 2023 gRPC authors.
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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 rbac
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import (
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"encoding/json"
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"fmt"
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"strings"
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v1xdsudpatypepb "github.com/cncf/xds/go/udpa/type/v1"
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v3xdsxdstypepb "github.com/cncf/xds/go/xds/type/v3"
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v3rbacpb "github.com/envoyproxy/go-control-plane/envoy/config/rbac/v3"
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v3auditloggersstreampb "github.com/envoyproxy/go-control-plane/envoy/extensions/rbac/audit_loggers/stream/v3"
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"google.golang.org/grpc/authz/audit"
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"google.golang.org/grpc/authz/audit/stdout"
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"google.golang.org/protobuf/encoding/protojson"
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"google.golang.org/protobuf/types/known/anypb"
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"google.golang.org/protobuf/types/known/structpb"
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)
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func buildLogger(loggerConfig *v3rbacpb.RBAC_AuditLoggingOptions_AuditLoggerConfig) (audit.Logger, error) {
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if loggerConfig.GetAuditLogger().GetTypedConfig() == nil {
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return nil, fmt.Errorf("missing required field: TypedConfig")
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}
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customConfig, loggerName, err := getCustomConfig(loggerConfig.AuditLogger.TypedConfig)
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if err != nil {
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return nil, err
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}
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if loggerName == "" {
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return nil, fmt.Errorf("field TypedConfig.TypeURL cannot be an empty string")
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}
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factory := audit.GetLoggerBuilder(loggerName)
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if factory == nil {
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if loggerConfig.IsOptional {
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return nil, nil
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}
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return nil, fmt.Errorf("no builder registered for %v", loggerName)
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}
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auditLoggerConfig, err := factory.ParseLoggerConfig(customConfig)
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if err != nil {
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return nil, fmt.Errorf("custom config could not be parsed by registered factory. error: %v", err)
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}
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auditLogger := factory.Build(auditLoggerConfig)
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return auditLogger, nil
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}
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func getCustomConfig(config *anypb.Any) (json.RawMessage, string, error) {
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c, err := config.UnmarshalNew()
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if err != nil {
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return nil, "", err
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}
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switch m := c.(type) {
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case *v1xdsudpatypepb.TypedStruct:
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return convertCustomConfig(m.TypeUrl, m.Value)
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case *v3xdsxdstypepb.TypedStruct:
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return convertCustomConfig(m.TypeUrl, m.Value)
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case *v3auditloggersstreampb.StdoutAuditLog:
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return convertStdoutConfig(m)
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}
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return nil, "", fmt.Errorf("custom config not implemented for type [%v]", config.GetTypeUrl())
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}
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func convertStdoutConfig(config *v3auditloggersstreampb.StdoutAuditLog) (json.RawMessage, string, error) {
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json, err := protojson.Marshal(config)
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return json, stdout.Name, err
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}
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func convertCustomConfig(typeURL string, s *structpb.Struct) (json.RawMessage, string, error) {
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// The gRPC policy name will be the "type name" part of the value of the
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// type_url field in the TypedStruct. We get this by using the part after
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// the last / character. Can assume a valid type_url from the control plane.
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urls := strings.Split(typeURL, "/")
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if len(urls) == 0 {
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return nil, "", fmt.Errorf("error converting custom audit logger %v for %v: typeURL must have a url-like format with the typeName being the value after the last /", typeURL, s)
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}
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name := urls[len(urls)-1]
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rawJSON := []byte("{}")
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var err error
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if s != nil {
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rawJSON, err = json.Marshal(s)
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if err != nil {
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return nil, "", fmt.Errorf("error converting custom audit logger %v for %v: %v", typeURL, s, err)
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}
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}
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return rawJSON, name, nil
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}
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