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tailscale/tstest/integration/vms/vms_test.go

687 lines
19 KiB
Go

// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build linux
package vms
import (
"crypto/sha256"
"encoding/hex"
"flag"
"fmt"
"io"
"log"
"net"
"net/http"
"os"
"os/exec"
"path"
"path/filepath"
"regexp"
"strings"
"sync"
"syscall"
"testing"
"text/template"
"time"
expect "github.com/google/goexpect"
"github.com/pkg/sftp"
"golang.org/x/crypto/ssh"
"inet.af/netaddr"
"tailscale.com/tstest"
"tailscale.com/tstest/integration"
"tailscale.com/tstest/integration/testcontrol"
)
const securePassword = "hunter2"
var runVMTests = flag.Bool("run-vm-tests", false, "if set, run expensive (10G+ ram) VM based integration tests")
type Distro struct {
name string // amazon-linux
url string // URL to a qcow2 image
sha256sum string // hex-encoded sha256 sum of contents of URL
mem int // VM memory in megabytes
packageManager string // yum/apt/dnf/zypper
}
func (d *Distro) InstallPre() string {
switch d.packageManager {
case "yum":
return ` - [ yum, update, gnupg2 ]
- [ yum, "-y", install, iptables ]
`
case "zypper":
return ` - [ zypper, in, "-y", iptables ]
`
case "dnf":
return ` - [ dnf, install, "-y", iptables ]
`
case "apt":
return ` - [ apt-get, update ]
- [ apt-get, "-y", install, curl, "apt-transport-https", gnupg2 ]
`
case "apk":
return ` - [ apk, "-U", add, curl, "ca-certificates" ]`
}
return ""
}
// fetchDistro fetches a distribution from the internet if it doesn't already exist locally. It
// also validates the sha256 sum from a known good hash.
func fetchDistro(t *testing.T, resultDistro Distro) {
t.Helper()
cdir, err := os.UserCacheDir()
if err != nil {
t.Fatalf("can't find cache dir: %v", err)
}
cdir = filepath.Join(cdir, "tailscale", "vm-test")
qcowPath := filepath.Join(cdir, "qcow2", resultDistro.sha256sum)
_, err = os.Stat(qcowPath)
if err != nil {
t.Logf("downloading distro image %s to %s", resultDistro.url, qcowPath)
fout, err := os.Create(qcowPath)
if err != nil {
t.Fatal(err)
}
resp, err := http.Get(resultDistro.url)
if err != nil {
t.Fatalf("can't fetch qcow2 for %s (%s): %v", resultDistro.name, resultDistro.url, err)
}
if resp.StatusCode != http.StatusOK {
resp.Body.Close()
t.Fatalf("%s replied %s", resultDistro.url, resp.Status)
}
_, err = io.Copy(fout, resp.Body)
resp.Body.Close()
if err != nil {
t.Fatalf("download of %s failed: %v", resultDistro.url, err)
}
err = fout.Close()
if err != nil {
t.Fatalf("can't close fout: %v", err)
}
fin, err := os.Open(qcowPath)
if err != nil {
t.Fatal(err)
}
hasher := sha256.New()
if _, err := io.Copy(hasher, fin); err != nil {
t.Fatal(err)
}
hash := hex.EncodeToString(hasher.Sum(nil))
if hash != resultDistro.sha256sum {
t.Logf("got: %q", hash)
t.Logf("want: %q", resultDistro.sha256sum)
t.Fatal("hash mismatch, someone is doing something nasty")
}
t.Logf("hash check passed (%s)", resultDistro.sha256sum)
}
}
// run runs a command or fails the test.
func run(t *testing.T, dir, prog string, args ...string) {
t.Helper()
t.Logf("running: %s %s", prog, strings.Join(args, " "))
tstest.FixLogs(t)
cmd := exec.Command(prog, args...)
cmd.Stdout = log.Writer()
cmd.Stderr = log.Writer()
cmd.Dir = dir
if err := cmd.Run(); err != nil {
t.Fatal(err)
}
}
// mkLayeredQcow makes a layered qcow image that allows us to keep the upstream
// VM images pristine and only do our changes on an overlay.
func mkLayeredQcow(t *testing.T, tdir string, d Distro) {
t.Helper()
cdir, err := os.UserCacheDir()
if err != nil {
t.Fatalf("can't find cache dir: %v", err)
}
cdir = filepath.Join(cdir, "tailscale", "vm-test")
run(t, tdir, "qemu-img", "create",
"-f", "qcow2",
"-o", "backing_file="+filepath.Join(cdir, "qcow2", d.sha256sum),
filepath.Join(tdir, d.name+".qcow2"),
)
}
var (
metaDataTempl = template.Must(template.New("meta-data.yaml").Parse(metaDataTemplate))
userDataTempl = template.Must(template.New("user-data.yaml").Parse(userDataTemplate))
)
// mkSeed makes the cloud-init seed ISO that is used to configure a VM with
// tailscale.
func mkSeed(t *testing.T, d Distro, sshKey, hostURL, tdir string, port int) {
t.Helper()
dir := filepath.Join(tdir, d.name, "seed")
os.MkdirAll(dir, 0700)
// make meta-data
{
fout, err := os.Create(filepath.Join(dir, "meta-data"))
if err != nil {
t.Fatal(err)
}
err = metaDataTempl.Execute(fout, struct {
ID string
Hostname string
}{
ID: "31337",
Hostname: d.name,
})
if err != nil {
t.Fatal(err)
}
err = fout.Close()
if err != nil {
t.Fatal(err)
}
}
// make user-data
{
fout, err := os.Create(filepath.Join(dir, "user-data"))
if err != nil {
t.Fatal(err)
}
err = userDataTempl.Execute(fout, struct {
SSHKey string
HostURL string
Hostname string
Port int
InstallPre string
Password string
}{
SSHKey: strings.TrimSpace(sshKey),
HostURL: hostURL,
Hostname: d.name,
Port: port,
InstallPre: d.InstallPre(),
Password: securePassword,
})
if err != nil {
t.Fatal(err)
}
err = fout.Close()
if err != nil {
t.Fatal(err)
}
}
run(t, tdir, "genisoimage",
"-output", filepath.Join(dir, "seed.iso"),
"-volid", "cidata", "-joliet", "-rock",
filepath.Join(dir, "meta-data"),
filepath.Join(dir, "user-data"),
)
}
// mkVM makes a KVM-accelerated virtual machine and prepares it for introduction
// to the testcontrol server. The function it returns is for killing the virtual
// machine when it is time for it to die.
func mkVM(t *testing.T, n int, d Distro, sshKey, hostURL, tdir string) func() {
t.Helper()
cdir, err := os.UserCacheDir()
if err != nil {
t.Fatalf("can't find cache dir: %v", err)
}
cdir = filepath.Join(cdir, "within", "mkvm")
os.MkdirAll(filepath.Join(cdir, "qcow2"), 0755)
os.MkdirAll(filepath.Join(cdir, "seed"), 0755)
port := 23100 + n
fetchDistro(t, d)
mkLayeredQcow(t, tdir, d)
mkSeed(t, d, sshKey, hostURL, tdir, port)
driveArg := fmt.Sprintf("file=%s,if=virtio", filepath.Join(tdir, d.name+".qcow2"))
args := []string{
"-machine", "pc-q35-5.1,accel=kvm,usb=off,vmport=off,dump-guest-core=off",
"-netdev", fmt.Sprintf("user,hostfwd=::%d-:22,id=net0", port),
"-device", "virtio-net-pci,netdev=net0,id=net0,mac=8a:28:5c:30:1f:25",
"-m", fmt.Sprint(d.mem),
"-boot", "c",
"-drive", driveArg,
"-cdrom", filepath.Join(tdir, d.name, "seed", "seed.iso"),
"-vnc", fmt.Sprintf(":%d", n),
}
t.Logf("running: qemu-system-x86_64 %s", strings.Join(args, " "))
cmd := exec.Command("qemu-system-x86_64", args...)
err = cmd.Start()
if err != nil {
t.Fatal(err)
}
time.Sleep(time.Second)
if err := cmd.Process.Signal(syscall.Signal(0)); err != nil {
t.Fatal("qemu is not running")
}
return func() {
err := cmd.Process.Kill()
if err != nil {
t.Errorf("can't kill %s (%d): %v", d.name, cmd.Process.Pid, err)
}
}
}
// TestVMIntegrationEndToEnd creates a virtual machine with qemu, installs
// tailscale on it and then ensures that it connects to the network
// successfully.
func TestVMIntegrationEndToEnd(t *testing.T) {
if !*runVMTests {
t.Skip("not running integration tests (need -run-vm-tests)")
}
os.Setenv("CGO_ENABLED", "0")
if _, err := exec.LookPath("qemu-system-x86_64"); err != nil {
t.Logf("hint: nix-shell -p go -p qemu -p cdrkit --run 'go test -v -timeout=60m -run-vm-tests'")
t.Fatalf("missing dependency: %v", err)
}
if _, err := exec.LookPath("genisoimage"); err != nil {
t.Logf("hint: nix-shell -p go -p qemu -p cdrkit --run 'go test -v -timeout=60m -run-vm-tests'")
t.Fatalf("missing dependency: %v", err)
}
distros := []Distro{
// NOTE(Xe): If you run into issues getting the autoconfig to work, comment
// out all the other distros and uncomment this one. Connect with a VNC
// client with a command like this:
//
// $ vncviewer :0
//
// On NixOS you can get away with something like this:
//
// $ env NIXPKGS_ALLOW_UNFREE=1 nix-shell -p tigervnc --run 'vncviewer :0'
//
// Login as root with the password root. Then look in
// /var/log/cloud-init-output.log for what you messed up.
// {"alpine-edge", "https://xena.greedo.xeserv.us/pkg/alpine/img/alpine-edge-2021-05-18-cloud-init-within.qcow2", "b3bb15311c0bd3beffa1b554f022b75d3b7309b5fdf76fb146fe7c72b83b16d0", 256, "apk"},
// TODO(Xe): This is broken, and I don't know why, see #1988
//{"opensuse-leap-15.1", "https://download.opensuse.org/repositories/Cloud:/Images:/Leap_15.1/images/openSUSE-Leap-15.1-OpenStack.x86_64.qcow2", "3203e256dab5981ca3301408574b63bc522a69972fbe9850b65b54ff44a96e0a", 512, "zypper"},
{"amazon-linux", "https://cdn.amazonlinux.com/os-images/2.0.20210427.0/kvm/amzn2-kvm-2.0.20210427.0-x86_64.xfs.gpt.qcow2", "6ef9daef32cec69b2d0088626ec96410cd24afc504d57278bbf2f2ba2b7e529b", 512, "yum"},
{"centos-7", "https://cloud.centos.org/centos/7/images/CentOS-7-x86_64-GenericCloud.qcow2", "1db30c9c272fb37b00111b93dcebff16c278384755bdbe158559e9c240b73b80", 512, "yum"},
{"centos-8", "https://cloud.centos.org/centos/8/x86_64/images/CentOS-8-GenericCloud-8.3.2011-20201204.2.x86_64.qcow2", "7ec97062618dc0a7ebf211864abf63629da1f325578868579ee70c495bed3ba0", 768, "dnf"},
{"debian-9", "https://cdimage.debian.org/cdimage/openstack/9.13.21-20210511/debian-9.13.21-20210511-openstack-amd64.qcow2", "0667a08e2d947b331aee068db4bbf3a703e03edaf5afa52e23d534adff44b62a", 512, "apt"},
{"debian-10", "https://cdimage.debian.org/images/cloud/buster/20210329-591/debian-10-generic-amd64-20210329-591.qcow2", "70c61956095870c4082103d1a7a1cb5925293f8405fc6cb348588ec97e8611b0", 768, "apt"},
{"fedora-34", "https://download.fedoraproject.org/pub/fedora/linux/releases/34/Cloud/x86_64/images/Fedora-Cloud-Base-34-1.2.x86_64.qcow2", "b9b621b26725ba95442d9a56cbaa054784e0779a9522ec6eafff07c6e6f717ea", 768, "dnf"},
{"opensuse-leap-15.2", "https://download.opensuse.org/repositories/Cloud:/Images:/Leap_15.2/images/openSUSE-Leap-15.2-OpenStack.x86_64.qcow2", "4df9cee9281d1f57d20f79dc65d76e255592b904760e73c0dd44ac753a54330f", 512, "zypper"},
{"opensuse-tumbleweed", "https://download.opensuse.org/tumbleweed/appliances/openSUSE-Tumbleweed-JeOS.x86_64-OpenStack-Cloud.qcow2", "ba3ecd281045b5019f0fb11378329a644a41870b77631ea647b128cd07eb804b", 512, "zypper"},
{"ubuntu-16-04", "https://cloud-images.ubuntu.com/xenial/current/xenial-server-cloudimg-amd64-disk1.img", "50a21bc067c05e0c73bf5d8727ab61152340d93073b3dc32eff18b626f7d813b", 512, "apt"},
{"ubuntu-18-04", "https://cloud-images.ubuntu.com/bionic/current/bionic-server-cloudimg-amd64.img", "08396cf95c18534a2e3f88289bd92d18eee76f0e75813636b3ab9f1e603816d7", 512, "apt"},
{"ubuntu-20-04", "https://cloud-images.ubuntu.com/focal/current/focal-server-cloudimg-amd64.img", "513158b22ff0f08d0a078d8d60293bcddffdb17094a7809c76c52aba415ecc54", 512, "apt"},
{"ubuntu-20-10", "https://cloud-images.ubuntu.com/groovy/current/groovy-server-cloudimg-amd64.img", "e470df72fce4fb8d0ee4ef8af8eed740ee3bf51290515eb42e5c747725e98b6d", 512, "apt"},
{"ubuntu-21-04", "https://cloud-images.ubuntu.com/hirsute/current/hirsute-server-cloudimg-amd64.img", "7fab8eda0bcf6f8f6e63845ccf1e29de4706e3359c82d3888835093020fe6f05", 512, "apt"},
}
dir := t.TempDir()
ln, err := net.Listen("tcp", deriveBindhost(t)+":0")
if err != nil {
t.Fatalf("can't make TCP listener: %v", err)
}
defer ln.Close()
t.Logf("host:port: %s", ln.Addr())
cs := &testcontrol.Server{}
var (
ipMu sync.Mutex
ipMap = map[string]string{} // SSH port => IP address
)
mux := http.NewServeMux()
mux.Handle("/", cs)
// This handler will let the virtual machines tell the host information about that VM.
// This is used to maintain a list of port->IP address mappings that are known to be
// working. This allows later steps to connect over SSH. This returns no response to
// clients because no response is needed.
mux.HandleFunc("/myip/", func(w http.ResponseWriter, r *http.Request) {
ipMu.Lock()
defer ipMu.Unlock()
name := path.Base(r.URL.Path)
host, _, _ := net.SplitHostPort(r.RemoteAddr)
ipMap[name] = host
t.Logf("%s: %v", name, host)
})
hs := &http.Server{Handler: mux}
go hs.Serve(ln)
run(t, dir, "ssh-keygen", "-t", "ed25519", "-f", "machinekey", "-N", ``)
pubkey, err := os.ReadFile(filepath.Join(dir, "machinekey.pub"))
if err != nil {
t.Fatalf("can't read ssh key: %v", err)
}
privateKey, err := os.ReadFile(filepath.Join(dir, "machinekey"))
if err != nil {
t.Fatalf("can't read ssh private key: %v", err)
}
signer, err := ssh.ParsePrivateKey(privateKey)
if err != nil {
t.Fatalf("can't parse private key: %v", err)
}
loginServer := fmt.Sprintf("http://%s", ln.Addr())
t.Logf("loginServer: %s", loginServer)
cancels := make(chan func(), len(distros))
t.Run("mkvm", func(t *testing.T) {
for n, distro := range distros {
n, distro := n, distro
t.Run(distro.name, func(t *testing.T) {
t.Parallel()
cancel := mkVM(t, n, distro, string(pubkey), loginServer, dir)
cancels <- cancel
})
}
})
close(cancels)
for cancel := range cancels {
//lint:ignore SA9001 They do actually get ran
defer cancel()
if len(cancels) == 0 {
t.Log("all VMs started")
break
}
}
t.Run("wait-for-vms", func(t *testing.T) {
t.Log("waiting for VMs to register")
waiter := time.NewTicker(time.Second)
defer waiter.Stop()
n := 0
for {
<-waiter.C
ipMu.Lock()
if len(ipMap) == len(distros) {
ipMu.Unlock()
break
} else {
if n%30 == 0 {
t.Logf("ipMap: %d", len(ipMap))
t.Logf("distros: %d", len(distros))
}
}
n++
ipMu.Unlock()
}
})
ipMu.Lock()
defer ipMu.Unlock()
t.Run("join-net", func(t *testing.T) {
for port := range ipMap {
port := port
t.Run(port, func(t *testing.T) {
tstest.FixLogs(t)
t.Parallel()
hostport := fmt.Sprintf("127.0.0.1:%s", port)
// NOTE(Xe): This retry loop helps to make things a bit faster, centos sometimes is slow at starting its sshd. I don't know why they don't use socket activation.
const maxRetries = 5
var working bool
for i := 0; i < maxRetries; i++ {
conn, err := net.Dial("tcp", hostport)
if err == nil {
working = true
conn.Close()
break
}
time.Sleep(5 * time.Second)
}
if !working {
t.Fatalf("can't connect to %s, tried %d times", hostport, maxRetries)
}
t.Logf("about to ssh into 127.0.0.1:%s", port)
cli, err := ssh.Dial("tcp", hostport, &ssh.ClientConfig{
User: "root",
Auth: []ssh.AuthMethod{ssh.PublicKeys(signer), ssh.Password(securePassword)},
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
})
if err != nil {
t.Fatal(err)
}
copyBinaries(t, cli)
timeout := 5 * time.Minute
e, _, err := expect.SpawnSSH(cli, timeout, expect.Verbose(true), expect.VerboseWriter(log.Writer()))
if err != nil {
t.Fatalf("%s: can't register a shell session: %v", port, err)
}
defer e.Close()
t.Log("opened session")
_, _, err = e.Expect(regexp.MustCompile(`(\#)`), timeout)
if err != nil {
t.Fatalf("%s: can't get a shell: %v", port, err)
}
t.Logf("got shell for %s", port)
err = e.Send("systemctl start tailscaled.service\n")
if err != nil {
t.Fatalf("can't send command to start tailscaled: %v", err)
}
_, _, err = e.Expect(regexp.MustCompile(`(\#)`), timeout)
if err != nil {
t.Fatalf("%s: can't get a shell: %v", port, err)
}
err = e.Send(fmt.Sprintf("sudo tailscale up --login-server %s\n", loginServer))
if err != nil {
t.Fatalf("%s: can't send tailscale up command: %v", port, err)
}
_, _, err = e.Expect(regexp.MustCompile(`Success.`), timeout)
if err != nil {
t.Fatalf("not successful: %v", err)
}
})
}
})
if numNodes := cs.NumNodes(); numNodes != len(ipMap) {
t.Errorf("wanted %d nodes, got: %d", len(ipMap), numNodes)
}
}
func copyBinaries(t *testing.T, conn *ssh.Client) {
bins := integration.BuildTestBinaries(t)
cli, err := sftp.NewClient(conn)
if err != nil {
t.Fatalf("can't connect over sftp to copy binaries: %v", err)
}
mkdir(t, cli, "/usr/bin")
mkdir(t, cli, "/usr/sbin")
mkdir(t, cli, "/etc/systemd/system")
mkdir(t, cli, "/etc/default")
copyFile(t, cli, bins.Daemon, "/usr/sbin/tailscaled")
copyFile(t, cli, bins.CLI, "/usr/bin/tailscale")
// TODO(Xe): revisit this life decision, hopefully before this assumption
// breaks the test.
copyFile(t, cli, "../../../cmd/tailscaled/tailscaled.defaults", "/etc/default/tailscaled")
copyFile(t, cli, "../../../cmd/tailscaled/tailscaled.service", "/etc/systemd/system/tailscaled.service")
t.Log("tailscale installed!")
}
func mkdir(t *testing.T, cli *sftp.Client, name string) {
t.Helper()
err := cli.MkdirAll(name)
if err != nil {
t.Fatalf("can't make %s: %v", name, err)
}
}
func copyFile(t *testing.T, cli *sftp.Client, localSrc, remoteDest string) {
t.Helper()
fin, err := os.Open(localSrc)
if err != nil {
t.Fatalf("can't open: %v", err)
}
defer fin.Close()
fi, err := fin.Stat()
if err != nil {
t.Fatalf("can't stat: %v", err)
}
fout, err := cli.Create(remoteDest)
if err != nil {
t.Fatalf("can't create output file: %v", err)
}
err = fout.Chmod(fi.Mode())
if err != nil {
fout.Close()
t.Fatalf("can't chmod fout: %v", err)
}
n, err := io.Copy(fout, fin)
if err != nil {
fout.Close()
t.Fatalf("copy failed: %v", err)
}
if fi.Size() != n {
t.Fatalf("incorrect number of bytes copied: wanted: %d, got: %d", fi.Size(), n)
}
err = fout.Close()
if err != nil {
t.Fatalf("can't close fout on remote host: %v", err)
}
}
func deriveBindhost(t *testing.T) string {
t.Helper()
ifaces, err := net.Interfaces()
if err != nil {
t.Fatal(err)
}
rex := regexp.MustCompile(`^(eth|enp|wlp|wlan)`)
for _, iface := range ifaces {
t.Logf("found interface %s: %d", iface.Name, iface.Flags&net.FlagUp)
if (iface.Flags & net.FlagUp) == 0 {
continue
}
if rex.MatchString(iface.Name) {
addrs, err := iface.Addrs()
if err != nil {
t.Fatalf("can't get address for %s: %v", iface.Name, err)
}
for _, addr := range addrs {
return netaddr.MustParseIPPrefix(addr.String()).IP().String()
}
}
}
t.Fatal("can't find a bindhost")
return "invalid"
}
func TestDeriveBindhost(t *testing.T) {
t.Skip("broken on some machines; https://github.com/tailscale/tailscale/issues/2011")
t.Log(deriveBindhost(t))
}
const metaDataTemplate = `instance-id: {{.ID}}
local-hostname: {{.Hostname}}`
const userDataTemplate = `#cloud-config
#vim:syntax=yaml
cloud_config_modules:
- runcmd
cloud_final_modules:
- [users-groups, always]
- [scripts-user, once-per-instance]
users:
- name: root
ssh-authorized-keys:
- {{.SSHKey}}
- name: ts
plain_text_passwd: {{.Password}}
groups: [ wheel ]
sudo: [ "ALL=(ALL) NOPASSWD:ALL" ]
shell: /bin/sh
ssh-authorized-keys:
- {{.SSHKey}}
write_files:
- path: /etc/cloud/cloud.cfg.d/80_disable_network_after_firstboot.cfg
content: |
# Disable network configuration after first boot
network:
config: disabled
runcmd:
{{.InstallPre}}
- [ curl, "{{.HostURL}}/myip/{{.Port}}", "-H", "User-Agent: {{.Hostname}}" ]
`