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