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package mkcw
import (
"archive/tar"
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"net"
"net/http"
"os"
"path/filepath"
"sync"
"testing"
v1 "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestSlop(t *testing.T) {
testCases := []struct {
input int64
slop string
output int64
}{
{100, "", 125},
{100, "10%", 110},
{100, "100%", 200},
{100, "10GB", 10*1024*1024*1024 + 100},
{100, "10%+10GB", 10*1024*1024*1024 + 110},
{100, "10% + 10GB", 10*1024*1024*1024 + 110},
}
for _, testCase := range testCases {
t.Run(testCase.slop, func(t *testing.T) {
assert.Equal(t, testCase.output, slop(testCase.input, testCase.slop))
})
}
}
// 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 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 TestArchive(t *testing.T) {
ociConfig := &v1.Image{
Config: v1.ImageConfig{
User: "root",
Env: []string{"PATH=/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/usr/sbin:/sbin:/usr/sbin:/sbin"},
Cmd: []string{"/bin/bash"},
WorkingDir: "/root",
Labels: map[string]string{
"label_a": "b",
"label_c": "d",
},
},
}
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) {
// 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()) })
// generate the container rootfs using a temporary empty directory
archiveOptions := ArchiveOptions{
CPUs: 4,
Memory: 256,
TempDir: t.TempDir(),
AttestationURL: "http://" + addr.String(),
IgnoreAttestationErrors: ignoreAttestationErrors,
}
inputPath := t.TempDir()
rc, workloadConfig, err := Archive(inputPath, ociConfig, archiveOptions)
// bail now if we got an error we didn't expect
if err != nil {
if errors.As(err, &chainRetrievalError{}) {
if !ignoreChainRetrievalErrors {
return
}
}
if errors.As(err, &attestationError{}) {
if !ignoreAttestationErrors {
require.NoError(t, err)
}
}
return
}
if err == nil {
defer rc.Close()
}
// read each archive entry's contents into a map
contents := make(map[string][]byte)
tr := tar.NewReader(rc)
hdr, err := tr.Next()
for hdr != nil {
contents[hdr.Name], err = io.ReadAll(tr)
require.NoError(t, err)
hdr, err = tr.Next()
}
if err != nil {
require.ErrorIs(t, err, io.EOF)
}
// check that krun-sev.json is a JSON-encoded copy of the workload config
var writtenWorkloadConfig WorkloadConfig
err = json.Unmarshal(contents["krun-sev.json"], &writtenWorkloadConfig)
require.NoError(t, err)
assert.Equal(t, workloadConfig, writtenWorkloadConfig)
// save the disk image to a file
encryptedFile := filepath.Join(t.TempDir(), "encrypted.img")
err = os.WriteFile(encryptedFile, contents["disk.img"], 0o600)
require.NoError(t, err)
// check that we have a configuration footer in there
_, err = ReadWorkloadConfigFromImage(encryptedFile)
require.NoError(t, err)
// check that the attestation server got the encryption passphrase
handler.passphrasesLock.Lock()
passphrase := handler.passphrases[workloadConfig.WorkloadID]
handler.passphrasesLock.Unlock()
err = CheckLUKSPassphrase(encryptedFile, passphrase)
require.NoError(t, err)
})
}
}
}
}
|
