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// Copyright 2023 Google LLC
//
// 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 faketsm
import (
"bytes"
"fmt"
"math/big"
"path"
"testing"
"github.com/google/go-configfs-tsm/configfs/configfsi"
"github.com/google/go-configfs-tsm/report"
)
func checkOutblobExpectation(inblob []byte, privlevel uint, outblob []byte) error {
want := renderOutBlob([]byte(fmt.Sprintf("%d\n", privlevel)), inblob)
if !bytes.Equal(want, outblob) {
return fmt.Errorf("got %q, want %q", string(outblob), string(want))
}
return nil
}
func makeNonce(id uint) []byte {
// The nonce is currently expected to always be size 64.
result := make([]byte, 64)
copy(result, []byte(big.NewInt(int64(id)).String()))
return result
}
func checkErr(err error) (bool, error) {
if err != nil {
if err := report.GetGenerationErr(err); err != nil {
return true, nil
}
return false, err
}
return false, nil
}
func runIteration(t testing.TB, c configfsi.Client, r *report.OpenReport, tc *runner) error {
t.Helper()
nonce := makeNonce(tc.id)
t.Logf("Writing inblob %v", nonce)
if err := r.WriteOption("inblob", nonce); err != nil {
return fmt.Errorf("could not write inblob in %d: %v", tc.id, err)
}
t.Logf("Writing privlevel %d", (tc.id % 4))
if err := r.WriteOption("privlevel", []byte(fmt.Sprintf("%d", (tc.id%4)))); err != nil {
return fmt.Errorf("could not set privlevel: %v", err)
}
t.Logf("Reading outblob")
out, err := r.ReadOption("outblob")
if done, err := checkErr(err); done || err != nil {
if err != nil {
return fmt.Errorf("outblob read on client %d failed: %v", tc.id, err)
}
return nil
}
t.Logf("Checking outblob %v", out)
if err := checkOutblobExpectation(nonce, (tc.id % 4), out); err != nil {
return fmt.Errorf("attestation invariant violated: %v", err)
}
return nil
}
type runner struct {
iterations int
id uint
done chan int
}
func runInterference(t testing.TB, c configfsi.Client, entryPath string, tc *runner) {
t.Helper()
for i := 0; i < tc.iterations; i++ {
r, err := report.UnsafeWrap(c, entryPath)
if err != nil {
t.Errorf("could not create report entry: %v", err)
tc.done <- 1
return
}
if err := runIteration(t, c, r, tc); err != nil {
t.Error(err)
tc.done <- 1
return
}
}
t.Logf("Posting done for %d", tc.id)
tc.done <- 0
}
func runNoninterference(t testing.TB, c configfsi.Client, tc *runner) {
t.Helper()
for i := 0; i < tc.iterations; i++ {
nonce := makeNonce(tc.id)
resp, err := report.Get(c, &report.Request{
InBlob: nonce,
Privilege: &report.Privilege{Level: (tc.id % 4)},
})
if err == nil {
err = checkOutblobExpectation(nonce, (tc.id % 4), resp.OutBlob)
}
if err != nil {
t.Error(err)
tc.done <- 1
return
}
}
t.Logf("Posting done for %d", tc.id)
tc.done <- 0
}
// clients-many concurrent routines attempt to get an output on the same entry with
// different inblobs.
func nonceAnonceB(t testing.TB, clients, iterations int) {
t.Helper()
c := ReportV7(0)
entryPath, err := c.MkdirTemp(path.Join(configfsi.TsmPrefix, "report"), "entry")
if err != nil {
t.Fatalf("could not create entry: %v", err)
}
t.Logf("made entry %s", entryPath)
defer c.RemoveAll(entryPath)
complete := make(chan int)
for i := 0; i < clients; i++ {
go runInterference(t, c, entryPath, &runner{
iterations: iterations,
id: uint(i),
done: complete})
}
// Each client should write to the channel.
for i := 0; i < clients; i++ {
code := <-complete
if code == 1 {
t.Fatalf("early failure")
}
}
t.Logf("doooone")
}
func noninterferenceByDesign(t testing.TB, clients, iterations int) {
t.Helper()
c := ReportV7(0)
complete := make(chan int)
for i := 0; i < clients; i++ {
go runNoninterference(t, c, &runner{
iterations: iterations,
id: uint(i),
done: complete})
}
// Each client should write to the channel.
for i := 0; i < clients; i++ {
code := <-complete
if code == 1 {
t.Fatalf("early failure")
}
}
}
func BenchmarkReportGenerationInterference(b *testing.B) {
nonceAnonceB(b, 4, b.N)
}
func BenchmarkReportGenerationNoninterference(b *testing.B) {
noninterferenceByDesign(b, 20, b.N)
}
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