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package dockerfile
import (
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"os"
"os/exec"
"path/filepath"
"testing"
"time"
"github.com/containerd/continuity/fs/fstest"
"github.com/moby/buildkit/client"
"github.com/moby/buildkit/frontend/dockerui"
"github.com/moby/buildkit/session"
"github.com/moby/buildkit/session/sshforward/sshprovider"
"github.com/moby/buildkit/util/testutil/integration"
"github.com/stretchr/testify/require"
"github.com/tonistiigi/fsutil"
)
var sshTests = integration.TestFuncs(
testSSHSocketParams,
testSSHFileDescriptorsClosed,
)
func init() {
allTests = append(allTests, sshTests...)
}
func testSSHSocketParams(t *testing.T, sb integration.Sandbox) {
integration.SkipOnPlatform(t, "windows")
f := getFrontend(t, sb)
dockerfile := []byte(`
FROM busybox
RUN --mount=type=ssh,mode=741,uid=100,gid=102 [ "$(stat -c "%u %g %f" $SSH_AUTH_SOCK)" = "100 102 c1e1" ]
`)
dir := integration.Tmpdir(
t,
fstest.CreateFile("Dockerfile", dockerfile, 0600),
)
c, err := client.New(sb.Context(), sb.Address())
require.NoError(t, err)
defer c.Close()
k, err := rsa.GenerateKey(rand.Reader, 2048)
require.NoError(t, err)
dt := pem.EncodeToMemory(
&pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(k),
},
)
tmpDir := t.TempDir()
err = os.WriteFile(filepath.Join(tmpDir, "key"), dt, 0600)
require.NoError(t, err)
ssh, err := sshprovider.NewSSHAgentProvider([]sshprovider.AgentConfig{{
Paths: []string{filepath.Join(tmpDir, "key")},
}})
require.NoError(t, err)
_, err = f.Solve(sb.Context(), c, client.SolveOpt{
LocalMounts: map[string]fsutil.FS{
dockerui.DefaultLocalNameDockerfile: dir,
dockerui.DefaultLocalNameContext: dir,
},
Session: []session.Attachable{ssh},
}, nil)
require.NoError(t, err)
}
func testSSHFileDescriptorsClosed(t *testing.T, sb integration.Sandbox) {
integration.SkipOnPlatform(t, "windows")
f := getFrontend(t, sb)
dockerfile := []byte(`
FROM alpine
RUN --mount=type=ssh apk update \
&& apk add openssh-client-default \
&& mkdir -p -m 0600 ~/.ssh \
&& ssh-keyscan github.com >> ~/.ssh/known_hosts \
&& for i in $(seq 1 3); do \
ssh -T git@github.com; \
done; \
exit 0;
`)
dir := integration.Tmpdir(
t,
fstest.CreateFile("Dockerfile", dockerfile, 0600),
)
c, err := client.New(sb.Context(), sb.Address())
require.NoError(t, err)
defer c.Close()
// not using t.TempDir() here because the path ends up longer than the unix socket max length
tmpDir, err := os.MkdirTemp("", "buildkit-ssh-test-")
require.NoError(t, err)
t.Cleanup(func() {
os.RemoveAll(tmpDir)
})
sockPath := filepath.Join(tmpDir, "ssh-agent.sock")
sshAgentCmd := exec.CommandContext(sb.Context(), "ssh-agent", "-s", "-d", "-a", sockPath)
sshAgentOutputBuf := &bytes.Buffer{}
sshAgentCmd.Stderr = sshAgentOutputBuf
require.NoError(t, sshAgentCmd.Start())
var found bool
for i := 0; i < 100; i++ {
_, err := os.Stat(sockPath)
if err == nil {
found = true
break
}
time.Sleep(100 * time.Millisecond)
}
if !found {
sshAgentOutput := sshAgentOutputBuf.String()
t.Fatalf("ssh-agent failed to start: %s", sshAgentOutput)
}
ssh, err := sshprovider.NewSSHAgentProvider([]sshprovider.AgentConfig{{
Paths: []string{sockPath},
}})
require.NoError(t, err)
_, err = f.Solve(sb.Context(), c, client.SolveOpt{
LocalMounts: map[string]fsutil.FS{
dockerui.DefaultLocalNameDockerfile: dir,
dockerui.DefaultLocalNameContext: dir,
},
Session: []session.Attachable{ssh},
}, nil)
require.NoError(t, err)
sshAgentOutput := sshAgentOutputBuf.String()
require.Contains(t, sshAgentOutput, "process_message: socket 1")
require.NotContains(t, sshAgentOutput, "process_message: socket 2")
require.NotContains(t, sshAgentOutput, "process_message: socket 3")
}
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