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Groundwork for exposing when queries are filtered by ACLs (#11569)

This commit is contained in:
Dan Upton 2021-12-03 17:11:26 +00:00 committed by GitHub
parent da929237b5
commit 0efe478044
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20 changed files with 275 additions and 74 deletions
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3
.changelog/11569.txt Normal file
View File

@ -0,0 +1,3 @@
```release-note:enhancement
api: responses that contain only a partial subset of results, due to filtering by ACL policies, may now include an `X-Consul-Results-Filtered-By-ACLs` header
```

1
agent/consul/acl.go
View File

@ -1807,6 +1807,7 @@ func filterACLWithAuthorizer(logger hclog.Logger, authorizer acl.Authorizer, sub
filtered := filt.filterServiceTopology(v.ServiceTopology)
if filtered {
v.FilteredByACLs = true
v.QueryMeta.ResultsFilteredByACLs = true
}
case *structs.DatacenterIndexedCheckServiceNodes:

4
agent/consul/acl_endpoint.go
View File

@ -1360,7 +1360,7 @@ func (a *ACL) PolicyResolve(args *structs.ACLPolicyBatchGetRequest, reply *struc
}
}
a.srv.setQueryMeta(&reply.QueryMeta)
a.srv.setQueryMeta(&reply.QueryMeta, args.Token)
return nil
}
@ -1761,7 +1761,7 @@ func (a *ACL) RoleResolve(args *structs.ACLRoleBatchGetRequest, reply *structs.A
}
}
a.srv.setQueryMeta(&reply.QueryMeta)
a.srv.setQueryMeta(&reply.QueryMeta, args.Token)
return nil
}

2
agent/consul/internal_endpoint.go
View File

@ -411,7 +411,7 @@ func (m *Internal) EventFire(args *structs.EventFireRequest,
}
// Set the query meta data
m.srv.setQueryMeta(&reply.QueryMeta)
m.srv.setQueryMeta(&reply.QueryMeta, args.Token)
// Add the consul prefix to the event name
eventName := userEventName(args.Name)

7
agent/consul/internal_endpoint_test.go
View File

@ -1728,6 +1728,7 @@ func TestInternal_ServiceTopology(t *testing.T) {
var out structs.IndexedServiceTopology
require.NoError(r, msgpackrpc.CallWithCodec(codec, "Internal.ServiceTopology", &args, &out))
require.False(r, out.FilteredByACLs)
require.False(r, out.QueryMeta.ResultsFilteredByACLs)
require.Equal(r, "http", out.ServiceTopology.MetricsProtocol)
// foo/api, foo/api-proxy
@ -1767,6 +1768,7 @@ func TestInternal_ServiceTopology(t *testing.T) {
var out structs.IndexedServiceTopology
require.NoError(r, msgpackrpc.CallWithCodec(codec, "Internal.ServiceTopology", &args, &out))
require.False(r, out.FilteredByACLs)
require.False(r, out.QueryMeta.ResultsFilteredByACLs)
require.Equal(r, "http", out.ServiceTopology.MetricsProtocol)
// edge/ingress
@ -1822,6 +1824,7 @@ func TestInternal_ServiceTopology(t *testing.T) {
var out structs.IndexedServiceTopology
require.NoError(r, msgpackrpc.CallWithCodec(codec, "Internal.ServiceTopology", &args, &out))
require.False(r, out.FilteredByACLs)
require.False(r, out.QueryMeta.ResultsFilteredByACLs)
require.Equal(r, "http", out.ServiceTopology.MetricsProtocol)
// foo/api, foo/api-proxy
@ -1875,6 +1878,7 @@ func TestInternal_ServiceTopology(t *testing.T) {
var out structs.IndexedServiceTopology
require.NoError(r, msgpackrpc.CallWithCodec(codec, "Internal.ServiceTopology", &args, &out))
require.False(r, out.FilteredByACLs)
require.False(r, out.QueryMeta.ResultsFilteredByACLs)
require.Equal(r, "http", out.ServiceTopology.MetricsProtocol)
require.Len(r, out.ServiceTopology.Upstreams, 0)
@ -1931,6 +1935,7 @@ func TestInternal_ServiceTopology_RoutingConfig(t *testing.T) {
var out structs.IndexedServiceTopology
require.NoError(r, msgpackrpc.CallWithCodec(codec, "Internal.ServiceTopology", &args, &out))
require.False(r, out.FilteredByACLs)
require.False(r, out.QueryMeta.ResultsFilteredByACLs)
require.Equal(r, "http", out.ServiceTopology.MetricsProtocol)
require.Empty(r, out.ServiceTopology.Downstreams)
@ -2010,6 +2015,7 @@ service "web" { policy = "read" }
require.NoError(t, msgpackrpc.CallWithCodec(codec, "Internal.ServiceTopology", &args, &out))
require.True(t, out.FilteredByACLs)
require.True(t, out.QueryMeta.ResultsFilteredByACLs)
require.Equal(t, "http", out.ServiceTopology.MetricsProtocol)
// The web-proxy upstream gets filtered out from both bar and baz
@ -2030,6 +2036,7 @@ service "web" { policy = "read" }
require.NoError(t, msgpackrpc.CallWithCodec(codec, "Internal.ServiceTopology", &args, &out))
require.True(t, out.FilteredByACLs)
require.True(t, out.QueryMeta.ResultsFilteredByACLs)
require.Equal(t, "http", out.ServiceTopology.MetricsProtocol)
// The redis upstream gets filtered out but the api and proxy downstream are returned

10
agent/consul/prepared_query_endpoint.go
View File

@ -299,7 +299,7 @@ func (p *PreparedQuery) Explain(args *structs.PreparedQueryExecuteRequest,
defer metrics.MeasureSince([]string{"prepared-query", "explain"}, time.Now())
// We have to do this ourselves since we are not doing a blocking RPC.
p.srv.setQueryMeta(&reply.QueryMeta)
p.srv.setQueryMeta(&reply.QueryMeta, args.Token)
if args.RequireConsistent {
if err := p.srv.consistentRead(); err != nil {
return err
@ -346,7 +346,6 @@ func (p *PreparedQuery) Execute(args *structs.PreparedQueryExecuteRequest,
defer metrics.MeasureSince([]string{"prepared-query", "execute"}, time.Now())
// We have to do this ourselves since we are not doing a blocking RPC.
p.srv.setQueryMeta(&reply.QueryMeta)
if args.RequireConsistent {
if err := p.srv.consistentRead(); err != nil {
return err
@ -383,6 +382,9 @@ func (p *PreparedQuery) Execute(args *structs.PreparedQueryExecuteRequest,
// might not be worth the code complexity and behavior differences,
// though, since this is essentially a misconfiguration.
// We have to do this ourselves since we are not doing a blocking RPC.
p.srv.setQueryMeta(&reply.QueryMeta, token)
// Shuffle the results in case coordinates are not available if they
// requested an RTT sort.
reply.Nodes.Shuffle()
@ -481,7 +483,6 @@ func (p *PreparedQuery) ExecuteRemote(args *structs.PreparedQueryExecuteRemoteRe
defer metrics.MeasureSince([]string{"prepared-query", "execute_remote"}, time.Now())
// We have to do this ourselves since we are not doing a blocking RPC.
p.srv.setQueryMeta(&reply.QueryMeta)
if args.RequireConsistent {
if err := p.srv.consistentRead(); err != nil {
return err
@ -503,6 +504,9 @@ func (p *PreparedQuery) ExecuteRemote(args *structs.PreparedQueryExecuteRemoteRe
return err
}
// We have to do this ourselves since we are not doing a blocking RPC.
p.srv.setQueryMeta(&reply.QueryMeta, token)
// We don't bother trying to do an RTT sort here since we are by
// definition in another DC. We just shuffle to make sure that we
// balance the load across the results.

39
agent/consul/rpc.go
View File

@ -938,8 +938,6 @@ func (s *Server) blockingQuery(queryOpts structs.QueryOptionsCompat, queryMeta s
RUN_QUERY:
// Setup blocking loop
// Update the query metadata.
s.setQueryMeta(queryMeta)
// Validate
// If the read must be consistent we verify that we are still the leader.
@ -968,6 +966,10 @@ RUN_QUERY:
// Execute the queryFn
err := fn(ws, state)
// Update the query metadata.
s.setQueryMeta(queryMeta, queryOpts.GetToken())
// Note we check queryOpts.MinQueryIndex is greater than zero to determine if
// blocking was requested by client, NOT meta.Index since the state function
// might return zero if something is not initialized and care wasn't taken to
@ -1001,7 +1003,9 @@ RUN_QUERY:
}
// setQueryMeta is used to populate the QueryMeta data for an RPC call
func (s *Server) setQueryMeta(m structs.QueryMetaCompat) {
//
// Note: This method must be called *after* filtering query results with ACLs.
func (s *Server) setQueryMeta(m structs.QueryMetaCompat, token string) {
if s.IsLeader() {
m.SetLastContact(0)
m.SetKnownLeader(true)
@ -1009,6 +1013,7 @@ func (s *Server) setQueryMeta(m structs.QueryMetaCompat) {
m.SetLastContact(time.Since(s.raft.LastContact()))
m.SetKnownLeader(s.raft.Leader() != "")
}
maskResultsFilteredByACLs(token, m)
}
// consistentRead is used to ensure we do not perform a stale
@ -1043,3 +1048,31 @@ func (s *Server) consistentRead() error {
return structs.ErrNotReadyForConsistentReads
}
// maskResultsFilteredByACLs blanks out the ResultsFilteredByACLs flag if the
// request is unauthenticated, to limit information leaking.
//
// Endpoints that support bexpr filtering could be used in combination with
// this flag/header to discover the existence of resources to which the user
// does not have access, therefore we only expose it when the user presents
// a valid ACL token. This doesn't completely remove the risk (by nature the
// purpose of this flag is to let the user know there are resources they can
// not access) but it prevents completely unauthenticated users from doing so.
//
// Notes:
//
// * The definition of "unauthenticated" here is incomplete, as it doesn't
// account for the fact that operators can modify the anonymous token with
// custom policies, or set namespace default policies. As these scenarios
// are less common and this flag is a best-effort UX improvement, we think
// the trade-off for reduced complexity is acceptable.
//
// * This method assumes that the given token has already been validated (and
// will only check whether it is blank or not). It's a safe assumption because
// ResultsFilteredByACLs is only set to try when applying the already-resolved
// token's policies.
func maskResultsFilteredByACLs(token string, meta structs.QueryMetaCompat) {
if token == "" {
meta.SetResultsFilteredByACLs(false)
}
}

34
agent/consul/rpc_test.go
View File

@ -36,6 +36,7 @@ import (
"github.com/hashicorp/consul/agent/structs"
tokenStore "github.com/hashicorp/consul/agent/token"
"github.com/hashicorp/consul/api"
"github.com/hashicorp/consul/lib"
"github.com/hashicorp/consul/proto/pbsubscribe"
"github.com/hashicorp/consul/sdk/testutil"
"github.com/hashicorp/consul/sdk/testutil/retry"
@ -369,6 +370,39 @@ func TestRPC_blockingQuery(t *testing.T) {
t.Fatalf("bad: %d", calls)
}
}
t.Run("ResultsFilteredByACLs is reset for unauthenticated calls", func(t *testing.T) {
opts := structs.QueryOptions{
Token: "",
}
var meta structs.QueryMeta
fn := func(_ memdb.WatchSet, _ *state.Store) error {
meta.ResultsFilteredByACLs = true
return nil
}
err := s.blockingQuery(&opts, &meta, fn)
require.NoError(err)
require.False(meta.ResultsFilteredByACLs, "ResultsFilteredByACLs should be reset for unauthenticated calls")
})
t.Run("ResultsFilteredByACLs is honored for authenticated calls", func(t *testing.T) {
token, err := lib.GenerateUUID(nil)
require.NoError(err)
opts := structs.QueryOptions{
Token: token,
}
var meta structs.QueryMeta
fn := func(_ memdb.WatchSet, _ *state.Store) error {
meta.ResultsFilteredByACLs = true
return nil
}
err = s.blockingQuery(&opts, &meta, fn)
require.NoError(err)
require.True(meta.ResultsFilteredByACLs, "ResultsFilteredByACLs should be honored for authenticated calls")
})
}
func TestRPC_ReadyForConsistentReads(t *testing.T) {

2
agent/consul/snapshot_endpoint.go
View File

@ -77,7 +77,7 @@ func (s *Server) dispatchSnapshotRequest(args *structs.SnapshotRequest, in io.Re
// Set the metadata here before we do anything; this should always be
// pessimistic if we get more data while the snapshot is being taken.
s.setQueryMeta(&reply.QueryMeta)
s.setQueryMeta(&reply.QueryMeta, args.Token)
// Take the snapshot and capture the index.
snap, err := snapshot.New(s.logger, s.raft)

5
agent/consul/txn_endpoint.go
View File

@ -183,7 +183,6 @@ func (t *Txn) Read(args *structs.TxnReadRequest, reply *structs.TxnReadResponse)
defer metrics.MeasureSince([]string{"txn", "read"}, time.Now())
// We have to do this ourselves since we are not doing a blocking RPC.
t.srv.setQueryMeta(&reply.QueryMeta)
if args.RequireConsistent {
if err := t.srv.consistentRead(); err != nil {
return err
@ -204,5 +203,9 @@ func (t *Txn) Read(args *structs.TxnReadRequest, reply *structs.TxnReadResponse)
state := t.srv.fsm.State()
reply.Results, reply.Errors = state.TxnRO(args.Ops)
reply.Results = FilterTxnResults(authz, reply.Results)
// We have to do this ourselves since we are not doing a blocking RPC.
t.srv.setQueryMeta(&reply.QueryMeta, args.Token)
return nil
}

6
agent/consul/txn_endpoint_test.go
View File

@ -941,11 +941,7 @@ func TestTxn_Read_ACLDeny(t *testing.T) {
}
// Verify the transaction's return value.
expected := structs.TxnReadResponse{
QueryMeta: structs.QueryMeta{
KnownLeader: true,
},
}
var expected structs.TxnReadResponse
for i, op := range arg.Ops {
switch {
case op.KV != nil:

11
agent/http.go
View File

@ -734,6 +734,7 @@ func setMeta(resp http.ResponseWriter, m structs.QueryMetaCompat) {
setKnownLeader(resp, m.GetKnownLeader())
setConsistency(resp, m.GetConsistencyLevel())
setQueryBackend(resp, m.GetBackend())
setResultsFilteredByACLs(resp, m.GetResultsFilteredByACLs())
}
func setQueryBackend(resp http.ResponseWriter, backend structs.QueryBackend) {
@ -757,6 +758,16 @@ func setCacheMeta(resp http.ResponseWriter, m *cache.ResultMeta) {
}
}
// setResultsFilteredByACLs sets an HTTP response header to indicate that the
// query results were filtered by enforcing ACLs. If the given filtered value
// is false the header will be omitted, as its ambiguous whether the results
// were not filtered or whether the endpoint doesn't yet support this header.
func setResultsFilteredByACLs(resp http.ResponseWriter, filtered bool) {
if filtered {
resp.Header().Set("X-Consul-Results-Filtered-By-ACLs", "true")
}
}
// setHeaders is used to set canonical response header fields
func setHeaders(resp http.ResponseWriter, headers map[string]string) {
for field, value := range headers {

43
agent/http_test.go
View File

@ -264,6 +264,22 @@ func TestSetKnownLeader(t *testing.T) {
}
}
func TestSetFilteredByACLs(t *testing.T) {
t.Parallel()
resp := httptest.NewRecorder()
setResultsFilteredByACLs(resp, true)
header := resp.Header().Get("X-Consul-Results-Filtered-By-ACLs")
if header != "true" {
t.Fatalf("Bad: %v", header)
}
resp = httptest.NewRecorder()
setResultsFilteredByACLs(resp, false)
header = resp.Header().Get("X-Consul-Results-Filtered-By-ACLs")
if header != "" {
t.Fatalf("Bad: %v", header)
}
}
func TestSetLastContact(t *testing.T) {
t.Parallel()
tests := []struct {
@ -291,23 +307,24 @@ func TestSetLastContact(t *testing.T) {
func TestSetMeta(t *testing.T) {
t.Parallel()
meta := structs.QueryMeta{
Index: 1000,
KnownLeader: true,
LastContact: 123456 * time.Microsecond,
Index: 1000,
KnownLeader: true,
LastContact: 123456 * time.Microsecond,
ResultsFilteredByACLs: true,
}
resp := httptest.NewRecorder()
setMeta(resp, &meta)
header := resp.Header().Get("X-Consul-Index")
if header != "1000" {
t.Fatalf("Bad: %v", header)
testCases := map[string]string{
"X-Consul-Index": "1000",
"X-Consul-KnownLeader": "true",
"X-Consul-LastContact": "123",
"X-Consul-Results-Filtered-By-ACLs": "true",
}
header = resp.Header().Get("X-Consul-KnownLeader")
if header != "true" {
t.Fatalf("Bad: %v", header)
}
header = resp.Header().Get("X-Consul-LastContact")
if header != "123" {
t.Fatalf("Bad: %v", header)
for header, expectedValue := range testCases {
if v := resp.Header().Get(header); v != expectedValue {
t.Fatalf("expected %q for header %s got %q", expectedValue, header, v)
}
}
}

14
agent/structs/protobuf_compat.go
View File

@ -45,6 +45,8 @@ type QueryMetaCompat interface {
GetConsistencyLevel() string
SetConsistencyLevel(string)
GetBackend() QueryBackend
GetResultsFilteredByACLs() bool
SetResultsFilteredByACLs(bool)
}
// GetToken helps implement the QueryOptionsCompat interface
@ -274,3 +276,15 @@ func (q *QueryMeta) SetConsistencyLevel(consistencyLevel string) {
func (q *QueryMeta) GetBackend() QueryBackend {
return q.Backend
}
// GetResultsFilteredByACLs is needed to implement the structs.QueryMetaCompat
// interface.
func (q *QueryMeta) GetResultsFilteredByACLs() bool {
return q.ResultsFilteredByACLs
}
// SetResultsFilteredByACLs is needed to implement the structs.QueryMetaCompat
// interface.
func (q *QueryMeta) SetResultsFilteredByACLs(v bool) {
q.ResultsFilteredByACLs = v
}

5
agent/structs/structs.go
View File

@ -392,6 +392,11 @@ type QueryMeta struct {
// Backend used to handle this query, either blocking-query or streaming.
Backend QueryBackend
// ResultsFilteredByACLs is true when some of the query's results were
// filtered out by enforcing ACLs. It may be false because nothing was
// removed, or because the endpoint does not yet support this flag.
ResultsFilteredByACLs bool
}
// RegisterRequest is used for the Catalog.Register endpoint

9
agent/structs/structs_test.go
View File

@ -2449,10 +2449,11 @@ func TestSnapshotRequestResponse_MsgpackEncodeDecode(t *testing.T) {
in := &SnapshotResponse{
Error: "blah",
QueryMeta: QueryMeta{
Index: 3,
LastContact: 5 * time.Second,
KnownLeader: true,
ConsistencyLevel: "default",
Index: 3,
LastContact: 5 * time.Second,
KnownLeader: true,
ConsistencyLevel: "default",
ResultsFilteredByACLs: true,
},
}
TestMsgpackEncodeDecode(t, in, true)

13
api/api.go
View File

@ -281,6 +281,11 @@ type QueryMeta struct {
// defined policy. This can be "allow" which means ACLs are used to
// deny-list, or "deny" which means ACLs are allow-lists.
DefaultACLPolicy string
// ResultsFilteredByACLs is true when some of the query's results were
// filtered out by enforcing ACLs. It may be false because nothing was
// removed, or because the endpoint does not yet support this flag.
ResultsFilteredByACLs bool
}
// WriteMeta is used to return meta data about a write
@ -1071,6 +1076,14 @@ func parseQueryMeta(resp *http.Response, q *QueryMeta) error {
q.DefaultACLPolicy = v
}
// Parse the X-Consul-Results-Filtered-By-ACLs
switch header.Get("X-Consul-Results-Filtered-By-ACLs") {
case "true":
q.ResultsFilteredByACLs = true
default:
q.ResultsFilteredByACLs = false
}
// Parse Cache info
if cacheStr := header.Get("X-Cache"); cacheStr != "" {
q.CacheHit = strings.EqualFold(cacheStr, "HIT")

4
api/api_test.go
View File

@ -932,6 +932,7 @@ func TestAPI_ParseQueryMeta(t *testing.T) {
resp.Header.Set("X-Consul-KnownLeader", "true")
resp.Header.Set("X-Consul-Translate-Addresses", "true")
resp.Header.Set("X-Consul-Default-ACL-Policy", "deny")
resp.Header.Set("X-Consul-Results-Filtered-By-ACLs", "true")
qm := &QueryMeta{}
if err := parseQueryMeta(resp, qm); err != nil {
@ -953,6 +954,9 @@ func TestAPI_ParseQueryMeta(t *testing.T) {
if qm.DefaultACLPolicy != "deny" {
t.Fatalf("Bad: %v", qm)
}
if !qm.ResultsFilteredByACLs {
t.Fatalf("Bad: %v", qm)
}
}
func TestAPI_UnixSocket(t *testing.T) {

127
proto/pbcommon/common.pb.go
View File

@ -391,6 +391,10 @@ type QueryMeta struct {
// Having `discovery_max_stale` on the agent can affect whether
// the request was served by a leader.
ConsistencyLevel string `protobuf:"bytes,4,opt,name=ConsistencyLevel,proto3" json:"ConsistencyLevel,omitempty"`
// ResultsFilteredByACLs is true when some of the query's results were
// filtered out by enforcing ACLs. It may be false because nothing was
// removed, or because the endpoint does not yet support this flag.
ResultsFilteredByACLs bool `protobuf:"varint,7,opt,name=ResultsFilteredByACLs,proto3" json:"ResultsFilteredByACLs,omitempty"`
}
func (m *QueryMeta) Reset() { *m = QueryMeta{} }
@ -454,6 +458,13 @@ func (m *QueryMeta) GetConsistencyLevel() string {
return ""
}
func (m *QueryMeta) GetResultsFilteredByACLs() bool {
if m != nil {
return m.ResultsFilteredByACLs
}
return false
}
// EnterpriseMeta contains metadata that is only used by the Enterprise version
// of Consul.
type EnterpriseMeta struct {
@ -509,46 +520,49 @@ func init() {
func init() { proto.RegisterFile("proto/pbcommon/common.proto", fileDescriptor_a6f5ac44994d718c) }
var fileDescriptor_a6f5ac44994d718c = []byte{
// 620 bytes of a gzipped FileDescriptorProto
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0x00,
}
func (m *RaftIndex) Marshal() (dAtA []byte, err error) {
@ -818,6 +832,16 @@ func (m *QueryMeta) MarshalToSizedBuffer(dAtA []byte) (int, error) {
_ = i
var l int
_ = l
if m.ResultsFilteredByACLs {
i--
if m.ResultsFilteredByACLs {
dAtA[i] = 1
} else {
dAtA[i] = 0
}
i--
dAtA[i] = 0x38
}
if len(m.ConsistencyLevel) > 0 {
i -= len(m.ConsistencyLevel)
copy(dAtA[i:], m.ConsistencyLevel)
@ -1014,6 +1038,9 @@ func (m *QueryMeta) Size() (n int) {
if l > 0 {
n += 1 + l + sovCommon(uint64(l))
}
if m.ResultsFilteredByACLs {
n += 2
}
return n
}
@ -1872,6 +1899,26 @@ func (m *QueryMeta) Unmarshal(dAtA []byte) error {
}
m.ConsistencyLevel = string(dAtA[iNdEx:postIndex])
iNdEx = postIndex
case 7:
if wireType != 0 {
return fmt.Errorf("proto: wrong wireType = %d for field ResultsFilteredByACLs", wireType)
}
var v int
for shift := uint(0); ; shift += 7 {
if shift >= 64 {
return ErrIntOverflowCommon
}
if iNdEx >= l {
return io.ErrUnexpectedEOF
}
b := dAtA[iNdEx]
iNdEx++
v |= int(b&0x7F) << shift
if b < 0x80 {
break
}
}
m.ResultsFilteredByACLs = bool(v != 0)
default:
iNdEx = preIndex
skippy, err := skipCommon(dAtA[iNdEx:])

8
proto/pbcommon/common.proto
View File

@ -150,6 +150,14 @@ message QueryMeta {
// Having `discovery_max_stale` on the agent can affect whether
// the request was served by a leader.
string ConsistencyLevel = 4;
// Reserved for NotModified and Backend.
reserved 5, 6;
// ResultsFilteredByACLs is true when some of the query's results were
// filtered out by enforcing ACLs. It may be false because nothing was
// removed, or because the endpoint does not yet support this flag.
bool ResultsFilteredByACLs = 7;
}
// EnterpriseMeta contains metadata that is only used by the Enterprise version