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package buildah
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"io"
"net"
"net/http"
"os"
"path/filepath"
"sync"
"testing"
"github.com/containers/buildah/internal/mkcw"
mkcwtypes "github.com/containers/buildah/internal/mkcw/types"
"github.com/containers/image/v5/types"
"github.com/containers/storage"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
// dummyAttestationHandler replies with a fixed response code to requests to
// the right path, and caches passphrases indexed by workload ID
type dummyAttestationHandler struct {
t *testing.T
status int
passphrases map[string]string
passphrasesLock sync.Mutex
}
func (d *dummyAttestationHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
var body bytes.Buffer
if req.Body != nil {
if _, err := io.Copy(&body, req.Body); err != nil {
d.t.Logf("reading request body: %v", err)
return
}
req.Body.Close()
}
if req.URL != nil && req.URL.Path == "/kbs/v0/register_workload" {
var registrationRequest mkcwtypes.RegistrationRequest
// if we can't decode the client request, bail
if err := json.Unmarshal(body.Bytes(), ®istrationRequest); err != nil {
rw.WriteHeader(http.StatusInternalServerError)
return
}
// cache the passphrase
d.passphrasesLock.Lock()
if d.passphrases == nil {
d.passphrases = make(map[string]string)
}
d.passphrases[registrationRequest.WorkloadID] = registrationRequest.Passphrase
d.passphrasesLock.Unlock()
// return the predetermined status
status := d.status
if status == 0 {
status = http.StatusOK
}
rw.WriteHeader(status)
return
}
// no such handler
rw.WriteHeader(http.StatusInternalServerError)
}
func TestCWConvertImage(t *testing.T) {
ctx := context.TODO()
systemContext := &types.SystemContext{}
for _, status := range []int{http.StatusOK, http.StatusInternalServerError} {
for _, ignoreChainRetrievalErrors := range []bool{false, true} {
for _, ignoreAttestationErrors := range []bool{false, true} {
t.Run(fmt.Sprintf("status=%d,ignoreChainRetrievalErrors=%v,ignoreAttestationErrors=%v", status, ignoreChainRetrievalErrors, ignoreAttestationErrors), func(t *testing.T) {
// create a per-test Store object
storeOptions := storage.StoreOptions{
GraphRoot: t.TempDir(),
RunRoot: t.TempDir(),
GraphDriverName: "vfs",
}
store, err := storage.GetStore(storeOptions)
require.NoError(t, err)
t.Cleanup(func() {
if _, err := store.Shutdown(true); err != nil {
t.Logf("store.Shutdown(%q): %v", t.Name(), err)
}
})
// listen on a system-assigned port
listener, err := net.Listen("tcp", ":0")
require.NoError(t, err)
// keep track of our listener address
addr := listener.Addr()
// serve requests on that listener
handler := &dummyAttestationHandler{t: t, status: status}
server := http.Server{
Handler: handler,
}
go func() {
if err := server.Serve(listener); err != nil && !errors.Is(err, http.ErrServerClosed) {
t.Logf("serve: %v", err)
}
}()
// clean up at the end of this test
t.Cleanup(func() { assert.NoError(t, server.Close()) })
// convert an image
options := CWConvertImageOptions{
InputImage: "docker.io/library/busybox",
Tag: "localhost/busybox:encrypted",
AttestationURL: "http://" + addr.String(),
IgnoreAttestationErrors: ignoreAttestationErrors,
Slop: "16MB",
}
id, _, _, err := CWConvertImage(ctx, systemContext, store, options)
if status != http.StatusOK && !ignoreAttestationErrors {
assert.Error(t, err)
return
}
if ignoreChainRetrievalErrors && ignoreAttestationErrors {
assert.NoError(t, err)
}
if err != nil {
t.Skipf("%s: %v", t.Name(), err)
return
}
// mount the image
path, err := store.MountImage(id, nil, "")
require.NoError(t, err)
t.Cleanup(func() {
if _, err := store.UnmountImage(id, true); err != nil {
t.Logf("store.UnmountImage(%q): %v", t.Name(), err)
}
})
// check that the image's contents look like what we expect: disk
disk := filepath.Join(path, "disk.img")
require.FileExists(t, disk)
workloadConfig, err := mkcw.ReadWorkloadConfigFromImage(disk)
require.NoError(t, err)
handler.passphrasesLock.Lock()
decryptionPassphrase := handler.passphrases[workloadConfig.WorkloadID]
handler.passphrasesLock.Unlock()
err = mkcw.CheckLUKSPassphrase(disk, decryptionPassphrase)
assert.NoError(t, err)
// check that the image's contents look like what we expect: config file
config := filepath.Join(path, "krun-sev.json")
require.FileExists(t, config)
workloadConfigBytes, err := os.ReadFile(config)
require.NoError(t, err)
var workloadConfigTwo mkcwtypes.WorkloadConfig
err = json.Unmarshal(workloadConfigBytes, &workloadConfigTwo)
require.NoError(t, err)
assert.Equal(t, workloadConfig, workloadConfigTwo)
// check that the image's contents look like what we expect: an executable entry point
entrypoint := filepath.Join(path, "entrypoint")
require.FileExists(t, entrypoint)
st, err := os.Stat(entrypoint)
require.NoError(t, err)
assert.Equal(t, st.Mode().Type(), os.FileMode(0)) // regular file
})
}
}
}
}
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