mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-29 04:55:31 +00:00
7686ff6c46
Co-authored-by: Andrew Lytvynov <awly@tailscale.com> Signed-off-by: Aaron Klotz <aaron@tailscale.com>
586 lines
14 KiB
Go
586 lines
14 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
|
|
// SPDX-License-Identifier: BSD-3-Clause
|
|
|
|
package distsign
|
|
|
|
import (
|
|
"bytes"
|
|
"context"
|
|
"crypto/ed25519"
|
|
"net/http"
|
|
"net/http/httptest"
|
|
"net/url"
|
|
"os"
|
|
"path/filepath"
|
|
"strings"
|
|
"testing"
|
|
|
|
"golang.org/x/crypto/blake2s"
|
|
)
|
|
|
|
func TestDownload(t *testing.T) {
|
|
srv := newTestServer(t)
|
|
c := srv.client(t)
|
|
|
|
tests := []struct {
|
|
desc string
|
|
before func(*testing.T)
|
|
src string
|
|
want []byte
|
|
wantErr bool
|
|
}{
|
|
{
|
|
desc: "missing file",
|
|
before: func(*testing.T) {},
|
|
src: "hello",
|
|
wantErr: true,
|
|
},
|
|
{
|
|
desc: "success",
|
|
before: func(*testing.T) {
|
|
srv.addSigned("hello", []byte("world"))
|
|
},
|
|
src: "hello",
|
|
want: []byte("world"),
|
|
},
|
|
{
|
|
desc: "no signature",
|
|
before: func(*testing.T) {
|
|
srv.add("hello", []byte("world"))
|
|
},
|
|
src: "hello",
|
|
wantErr: true,
|
|
},
|
|
{
|
|
desc: "bad signature",
|
|
before: func(*testing.T) {
|
|
srv.add("hello", []byte("world"))
|
|
srv.add("hello.sig", []byte("potato"))
|
|
},
|
|
src: "hello",
|
|
wantErr: true,
|
|
},
|
|
{
|
|
desc: "signed with untrusted key",
|
|
before: func(t *testing.T) {
|
|
srv.add("hello", []byte("world"))
|
|
srv.add("hello.sig", newSigningKeyPair(t).sign([]byte("world")))
|
|
},
|
|
src: "hello",
|
|
wantErr: true,
|
|
},
|
|
{
|
|
desc: "signed with root key",
|
|
before: func(t *testing.T) {
|
|
srv.add("hello", []byte("world"))
|
|
srv.add("hello.sig", ed25519.Sign(srv.roots[0].k, []byte("world")))
|
|
},
|
|
src: "hello",
|
|
wantErr: true,
|
|
},
|
|
{
|
|
desc: "bad signing key signature",
|
|
before: func(t *testing.T) {
|
|
srv.add("distsign.pub.sig", []byte("potato"))
|
|
srv.addSigned("hello", []byte("world"))
|
|
},
|
|
src: "hello",
|
|
wantErr: true,
|
|
},
|
|
}
|
|
|
|
for _, tt := range tests {
|
|
t.Run(tt.desc, func(t *testing.T) {
|
|
srv.reset()
|
|
tt.before(t)
|
|
|
|
dst := filepath.Join(t.TempDir(), tt.src)
|
|
t.Cleanup(func() {
|
|
os.Remove(dst)
|
|
})
|
|
err := c.Download(context.Background(), tt.src, dst)
|
|
if err != nil {
|
|
if tt.wantErr {
|
|
return
|
|
}
|
|
t.Fatalf("unexpected error from Download(%q): %v", tt.src, err)
|
|
}
|
|
if tt.wantErr {
|
|
t.Fatalf("Download(%q) succeeded, expected an error", tt.src)
|
|
}
|
|
got, err := os.ReadFile(dst)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
if !bytes.Equal(tt.want, got) {
|
|
t.Errorf("Download(%q): got %q, want %q", tt.src, got, tt.want)
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
func TestValidateLocalBinary(t *testing.T) {
|
|
srv := newTestServer(t)
|
|
c := srv.client(t)
|
|
|
|
tests := []struct {
|
|
desc string
|
|
before func(*testing.T)
|
|
src string
|
|
wantErr bool
|
|
}{
|
|
{
|
|
desc: "missing file",
|
|
before: func(*testing.T) {},
|
|
src: "hello",
|
|
wantErr: true,
|
|
},
|
|
{
|
|
desc: "success",
|
|
before: func(*testing.T) {
|
|
srv.addSigned("hello", []byte("world"))
|
|
},
|
|
src: "hello",
|
|
},
|
|
{
|
|
desc: "contents changed",
|
|
before: func(*testing.T) {
|
|
srv.addSigned("hello", []byte("new world"))
|
|
},
|
|
src: "hello",
|
|
wantErr: true,
|
|
},
|
|
{
|
|
desc: "no signature",
|
|
before: func(*testing.T) {
|
|
srv.add("hello", []byte("world"))
|
|
},
|
|
src: "hello",
|
|
wantErr: true,
|
|
},
|
|
{
|
|
desc: "bad signature",
|
|
before: func(*testing.T) {
|
|
srv.add("hello", []byte("world"))
|
|
srv.add("hello.sig", []byte("potato"))
|
|
},
|
|
src: "hello",
|
|
wantErr: true,
|
|
},
|
|
{
|
|
desc: "signed with untrusted key",
|
|
before: func(t *testing.T) {
|
|
srv.add("hello", []byte("world"))
|
|
srv.add("hello.sig", newSigningKeyPair(t).sign([]byte("world")))
|
|
},
|
|
src: "hello",
|
|
wantErr: true,
|
|
},
|
|
{
|
|
desc: "signed with root key",
|
|
before: func(t *testing.T) {
|
|
srv.add("hello", []byte("world"))
|
|
srv.add("hello.sig", ed25519.Sign(srv.roots[0].k, []byte("world")))
|
|
},
|
|
src: "hello",
|
|
wantErr: true,
|
|
},
|
|
{
|
|
desc: "bad signing key signature",
|
|
before: func(t *testing.T) {
|
|
srv.add("distsign.pub.sig", []byte("potato"))
|
|
srv.addSigned("hello", []byte("world"))
|
|
},
|
|
src: "hello",
|
|
wantErr: true,
|
|
},
|
|
}
|
|
|
|
for _, tt := range tests {
|
|
t.Run(tt.desc, func(t *testing.T) {
|
|
srv.reset()
|
|
|
|
// First just do a successful Download.
|
|
want := []byte("world")
|
|
srv.addSigned("hello", want)
|
|
dst := filepath.Join(t.TempDir(), tt.src)
|
|
err := c.Download(context.Background(), tt.src, dst)
|
|
if err != nil {
|
|
t.Fatalf("unexpected error from Download(%q): %v", tt.src, err)
|
|
}
|
|
got, err := os.ReadFile(dst)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
if !bytes.Equal(want, got) {
|
|
t.Errorf("Download(%q): got %q, want %q", tt.src, got, want)
|
|
}
|
|
|
|
// Now we reset srv with the test case and validate against the local dst.
|
|
srv.reset()
|
|
tt.before(t)
|
|
|
|
err = c.ValidateLocalBinary(tt.src, dst)
|
|
if err != nil {
|
|
if tt.wantErr {
|
|
return
|
|
}
|
|
t.Fatalf("unexpected error from ValidateLocalBinary(%q): %v", tt.src, err)
|
|
}
|
|
if tt.wantErr {
|
|
t.Fatalf("ValidateLocalBinary(%q) succeeded, expected an error", tt.src)
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
func TestRotateRoot(t *testing.T) {
|
|
srv := newTestServer(t)
|
|
c1 := srv.client(t)
|
|
ctx := context.Background()
|
|
|
|
srv.addSigned("hello", []byte("world"))
|
|
if err := c1.Download(ctx, "hello", filepath.Join(t.TempDir(), "hello")); err != nil {
|
|
t.Fatalf("Download failed on a fresh server: %v", err)
|
|
}
|
|
|
|
// Remove first root and replace it with a new key.
|
|
srv.roots = append(srv.roots[1:], newRootKeyPair(t))
|
|
|
|
// Old client can still download files because it still trusts the old
|
|
// root key.
|
|
if err := c1.Download(ctx, "hello", filepath.Join(t.TempDir(), "hello")); err != nil {
|
|
t.Fatalf("Download failed after root rotation on old client: %v", err)
|
|
}
|
|
// New client should fail download because current signing key is signed by
|
|
// the revoked root that new client doesn't trust.
|
|
c2 := srv.client(t)
|
|
if err := c2.Download(ctx, "hello", filepath.Join(t.TempDir(), "hello")); err == nil {
|
|
t.Fatalf("Download succeeded on new client, but signing key is signed with revoked root key")
|
|
}
|
|
// Re-sign signing key with another valid root that client still trusts.
|
|
srv.resignSigningKeys()
|
|
// Both old and new clients should now be able to download.
|
|
//
|
|
// Note: we don't need to re-sign the "hello" file because signing key
|
|
// didn't change (only signing key's signature).
|
|
if err := c1.Download(ctx, "hello", filepath.Join(t.TempDir(), "hello")); err != nil {
|
|
t.Fatalf("Download failed after root rotation on old client with re-signed signing key: %v", err)
|
|
}
|
|
if err := c2.Download(ctx, "hello", filepath.Join(t.TempDir(), "hello")); err != nil {
|
|
t.Fatalf("Download failed after root rotation on new client with re-signed signing key: %v", err)
|
|
}
|
|
}
|
|
|
|
func TestRotateSigning(t *testing.T) {
|
|
srv := newTestServer(t)
|
|
c := srv.client(t)
|
|
ctx := context.Background()
|
|
|
|
srv.addSigned("hello", []byte("world"))
|
|
if err := c.Download(ctx, "hello", filepath.Join(t.TempDir(), "hello")); err != nil {
|
|
t.Fatalf("Download failed on a fresh server: %v", err)
|
|
}
|
|
|
|
// Replace signing key but don't publish it yet.
|
|
srv.sign = append(srv.sign, newSigningKeyPair(t))
|
|
if err := c.Download(ctx, "hello", filepath.Join(t.TempDir(), "hello")); err != nil {
|
|
t.Fatalf("Download failed after new signing key added but before publishing it: %v", err)
|
|
}
|
|
|
|
// Publish new signing key bundle with both keys.
|
|
srv.resignSigningKeys()
|
|
if err := c.Download(ctx, "hello", filepath.Join(t.TempDir(), "hello")); err != nil {
|
|
t.Fatalf("Download failed after new signing key was published: %v", err)
|
|
}
|
|
|
|
// Re-sign the "hello" file with new signing key.
|
|
srv.add("hello.sig", srv.sign[1].sign([]byte("world")))
|
|
if err := c.Download(ctx, "hello", filepath.Join(t.TempDir(), "hello")); err != nil {
|
|
t.Fatalf("Download failed after re-signing with new signing key: %v", err)
|
|
}
|
|
|
|
// Drop the old signing key.
|
|
srv.sign = srv.sign[1:]
|
|
srv.resignSigningKeys()
|
|
if err := c.Download(ctx, "hello", filepath.Join(t.TempDir(), "hello")); err != nil {
|
|
t.Fatalf("Download failed after removing old signing key: %v", err)
|
|
}
|
|
|
|
// Add another key and re-sign the file with it *before* publishing.
|
|
srv.sign = append(srv.sign, newSigningKeyPair(t))
|
|
srv.add("hello.sig", srv.sign[1].sign([]byte("world")))
|
|
if err := c.Download(ctx, "hello", filepath.Join(t.TempDir(), "hello")); err == nil {
|
|
t.Fatalf("Download succeeded when signed with a not-yet-published signing key")
|
|
}
|
|
// Fix this by publishing the new key.
|
|
srv.resignSigningKeys()
|
|
if err := c.Download(ctx, "hello", filepath.Join(t.TempDir(), "hello")); err != nil {
|
|
t.Fatalf("Download failed after publishing new signing key: %v", err)
|
|
}
|
|
}
|
|
|
|
func TestParseRootKey(t *testing.T) {
|
|
tests := []struct {
|
|
desc string
|
|
generate func() ([]byte, []byte, error)
|
|
wantErr bool
|
|
}{
|
|
{
|
|
desc: "valid",
|
|
generate: GenerateRootKey,
|
|
},
|
|
{
|
|
desc: "signing",
|
|
generate: GenerateSigningKey,
|
|
wantErr: true,
|
|
},
|
|
{
|
|
desc: "nil",
|
|
generate: func() ([]byte, []byte, error) { return nil, nil, nil },
|
|
wantErr: true,
|
|
},
|
|
{
|
|
desc: "invalid PEM tag",
|
|
generate: func() ([]byte, []byte, error) {
|
|
priv, pub, err := GenerateRootKey()
|
|
priv = bytes.Replace(priv, []byte("ROOT "), nil, -1)
|
|
return priv, pub, err
|
|
},
|
|
wantErr: true,
|
|
},
|
|
{
|
|
desc: "not PEM",
|
|
generate: func() ([]byte, []byte, error) { return []byte("s3cr3t"), nil, nil },
|
|
wantErr: true,
|
|
},
|
|
}
|
|
for _, tt := range tests {
|
|
t.Run(tt.desc, func(t *testing.T) {
|
|
priv, _, err := tt.generate()
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
r, err := ParseRootKey(priv)
|
|
if err != nil {
|
|
if tt.wantErr {
|
|
return
|
|
}
|
|
t.Fatalf("unexpected error: %v", err)
|
|
}
|
|
if tt.wantErr {
|
|
t.Fatal("expected non-nil error")
|
|
}
|
|
if r == nil {
|
|
t.Errorf("got nil error and nil RootKey")
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
func TestParseSigningKey(t *testing.T) {
|
|
tests := []struct {
|
|
desc string
|
|
generate func() ([]byte, []byte, error)
|
|
wantErr bool
|
|
}{
|
|
{
|
|
desc: "valid",
|
|
generate: GenerateSigningKey,
|
|
},
|
|
{
|
|
desc: "root",
|
|
generate: GenerateRootKey,
|
|
wantErr: true,
|
|
},
|
|
{
|
|
desc: "nil",
|
|
generate: func() ([]byte, []byte, error) { return nil, nil, nil },
|
|
wantErr: true,
|
|
},
|
|
{
|
|
desc: "invalid PEM tag",
|
|
generate: func() ([]byte, []byte, error) {
|
|
priv, pub, err := GenerateSigningKey()
|
|
priv = bytes.Replace(priv, []byte("SIGNING "), nil, -1)
|
|
return priv, pub, err
|
|
},
|
|
wantErr: true,
|
|
},
|
|
{
|
|
desc: "not PEM",
|
|
generate: func() ([]byte, []byte, error) { return []byte("s3cr3t"), nil, nil },
|
|
wantErr: true,
|
|
},
|
|
}
|
|
for _, tt := range tests {
|
|
t.Run(tt.desc, func(t *testing.T) {
|
|
priv, _, err := tt.generate()
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
r, err := ParseSigningKey(priv)
|
|
if err != nil {
|
|
if tt.wantErr {
|
|
return
|
|
}
|
|
t.Fatalf("unexpected error: %v", err)
|
|
}
|
|
if tt.wantErr {
|
|
t.Fatal("expected non-nil error")
|
|
}
|
|
if r == nil {
|
|
t.Errorf("got nil error and nil SigningKey")
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
type testServer struct {
|
|
roots []rootKeyPair
|
|
sign []signingKeyPair
|
|
files map[string][]byte
|
|
srv *httptest.Server
|
|
}
|
|
|
|
func newTestServer(t *testing.T) *testServer {
|
|
var roots []rootKeyPair
|
|
for i := 0; i < 3; i++ {
|
|
roots = append(roots, newRootKeyPair(t))
|
|
}
|
|
|
|
ts := &testServer{
|
|
roots: roots,
|
|
sign: []signingKeyPair{newSigningKeyPair(t)},
|
|
}
|
|
ts.reset()
|
|
ts.srv = httptest.NewServer(ts)
|
|
t.Cleanup(ts.srv.Close)
|
|
return ts
|
|
}
|
|
|
|
func (s *testServer) client(t *testing.T) *Client {
|
|
roots := make([]ed25519.PublicKey, 0, len(s.roots))
|
|
for _, r := range s.roots {
|
|
pub, err := parseSinglePublicKey(r.pubRaw, pemTypeRootPublic)
|
|
if err != nil {
|
|
t.Fatalf("parsePublicKey: %v", err)
|
|
}
|
|
roots = append(roots, pub)
|
|
}
|
|
u, err := url.Parse(s.srv.URL)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
return &Client{
|
|
logf: t.Logf,
|
|
roots: roots,
|
|
pkgsAddr: u,
|
|
}
|
|
}
|
|
|
|
func (s *testServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
|
path := strings.TrimPrefix(r.URL.Path, "/")
|
|
data, ok := s.files[path]
|
|
if !ok {
|
|
http.NotFound(w, r)
|
|
return
|
|
}
|
|
w.Write(data)
|
|
}
|
|
|
|
func (s *testServer) addSigned(name string, data []byte) {
|
|
s.files[name] = data
|
|
s.files[name+".sig"] = s.sign[0].sign(data)
|
|
}
|
|
|
|
func (s *testServer) add(name string, data []byte) {
|
|
s.files[name] = data
|
|
}
|
|
|
|
func (s *testServer) reset() {
|
|
s.files = make(map[string][]byte)
|
|
s.resignSigningKeys()
|
|
}
|
|
|
|
func (s *testServer) resignSigningKeys() {
|
|
var pubs [][]byte
|
|
for _, k := range s.sign {
|
|
pubs = append(pubs, k.pubRaw)
|
|
}
|
|
bundle := bytes.Join(pubs, []byte("\n"))
|
|
sig := s.roots[0].sign(bundle)
|
|
s.files["distsign.pub"] = bundle
|
|
s.files["distsign.pub.sig"] = sig
|
|
}
|
|
|
|
type rootKeyPair struct {
|
|
*RootKey
|
|
keyPair
|
|
}
|
|
|
|
func newRootKeyPair(t *testing.T) rootKeyPair {
|
|
privRaw, pubRaw, err := GenerateRootKey()
|
|
if err != nil {
|
|
t.Fatalf("GenerateRootKey: %v", err)
|
|
}
|
|
kp := keyPair{
|
|
privRaw: privRaw,
|
|
pubRaw: pubRaw,
|
|
}
|
|
priv, err := parsePrivateKey(kp.privRaw, pemTypeRootPrivate)
|
|
if err != nil {
|
|
t.Fatalf("parsePrivateKey: %v", err)
|
|
}
|
|
return rootKeyPair{
|
|
RootKey: &RootKey{k: priv},
|
|
keyPair: kp,
|
|
}
|
|
}
|
|
|
|
func (s rootKeyPair) sign(bundle []byte) []byte {
|
|
sig, err := s.SignSigningKeys(bundle)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return sig
|
|
}
|
|
|
|
type signingKeyPair struct {
|
|
*SigningKey
|
|
keyPair
|
|
}
|
|
|
|
func newSigningKeyPair(t *testing.T) signingKeyPair {
|
|
privRaw, pubRaw, err := GenerateSigningKey()
|
|
if err != nil {
|
|
t.Fatalf("GenerateSigningKey: %v", err)
|
|
}
|
|
kp := keyPair{
|
|
privRaw: privRaw,
|
|
pubRaw: pubRaw,
|
|
}
|
|
priv, err := parsePrivateKey(kp.privRaw, pemTypeSigningPrivate)
|
|
if err != nil {
|
|
t.Fatalf("parsePrivateKey: %v", err)
|
|
}
|
|
return signingKeyPair{
|
|
SigningKey: &SigningKey{k: priv},
|
|
keyPair: kp,
|
|
}
|
|
}
|
|
|
|
func (s signingKeyPair) sign(blob []byte) []byte {
|
|
hash := blake2s.Sum256(blob)
|
|
sig, err := s.SignPackageHash(hash[:], int64(len(blob)))
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return sig
|
|
}
|
|
|
|
type keyPair struct {
|
|
privRaw []byte
|
|
pubRaw []byte
|
|
}
|