consul/agent/grpc-external/services/resource/read.go

116 lines
3.5 KiB
Go

// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: BUSL-1.1
package resource
import (
"context"
"errors"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"github.com/hashicorp/consul/acl"
"github.com/hashicorp/consul/internal/resource"
"github.com/hashicorp/consul/internal/storage"
"github.com/hashicorp/consul/proto-public/pbresource"
)
func (s *Server) Read(ctx context.Context, req *pbresource.ReadRequest) (*pbresource.ReadResponse, error) {
// Light first pass validation based on what user passed in and not much more.
reg, err := s.ensureReadRequestValid(req)
if err != nil {
return nil, err
}
// acl.EnterpriseMeta acl.AuthorizerContext follow rules for V1 resources since they integrate with the V1 acl subsystem.
// pbresource.Tenacy follows rules for V2 resources and the Resource service.
// Example:
//
// A CE namespace scoped resource:
// V1: EnterpriseMeta{}
// V2: Tenancy {Partition: "default", Namespace: "default"}
//
// An ENT namespace scoped resource:
// V1: EnterpriseMeta{Partition: "default", Namespace: "default"}
// V2: Tenancy {Partition: "default", Namespace: "default"}
//
// It is necessary to convert back and forth depending on which component supports which version, V1 or V2.
entMeta := v2TenancyToV1EntMeta(req.Id.Tenancy)
authz, authzContext, err := s.getAuthorizer(tokenFromContext(ctx), entMeta)
if err != nil {
return nil, err
}
v1EntMetaToV2Tenancy(reg, entMeta, req.Id.Tenancy)
// ACL check usually comes before tenancy existence checks to not leak
// tenancy "existence", unless the ACL check requires the data payload
// to function.
authzNeedsData := false
err = reg.ACLs.Read(authz, authzContext, req.Id, nil)
switch {
case errors.Is(err, resource.ErrNeedResource):
authzNeedsData = true
err = nil
case acl.IsErrPermissionDenied(err):
return nil, status.Error(codes.PermissionDenied, err.Error())
case err != nil:
return nil, status.Errorf(codes.Internal, "failed read acl: %v", err)
}
// Check tenancy exists for the V2 resource.
if err = tenancyExists(reg, s.TenancyBridge, req.Id.Tenancy, codes.NotFound); err != nil {
return nil, err
}
resource, err := s.Backend.Read(ctx, readConsistencyFrom(ctx), req.Id)
switch {
case errors.Is(err, storage.ErrNotFound):
return nil, status.Error(codes.NotFound, err.Error())
case errors.As(err, &storage.GroupVersionMismatchError{}):
return nil, status.Error(codes.InvalidArgument, err.Error())
case err != nil:
return nil, status.Errorf(codes.Internal, "failed read: %v", err)
}
if authzNeedsData {
err = reg.ACLs.Read(authz, authzContext, req.Id, resource)
switch {
case acl.IsErrPermissionDenied(err):
return nil, status.Error(codes.PermissionDenied, err.Error())
case err != nil:
return nil, status.Errorf(codes.Internal, "failed read acl: %v", err)
}
}
return &pbresource.ReadResponse{Resource: resource}, nil
}
func (s *Server) ensureReadRequestValid(req *pbresource.ReadRequest) (*resource.Registration, error) {
if req.Id == nil {
return nil, status.Errorf(codes.InvalidArgument, "id is required")
}
if err := validateId(req.Id, "id"); err != nil {
return nil, err
}
// Check type exists.
reg, err := s.resolveType(req.Id.Type)
if err != nil {
return nil, err
}
if err = checkV2Tenancy(s.UseV2Tenancy, req.Id.Type); err != nil {
return nil, err
}
// Check scope
if err = validateScopedTenancy(reg.Scope, req.Id.Type, req.Id.Tenancy, false); err != nil {
return nil, err
}
return reg, nil
}