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keydata_test.go
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keydata_test.go
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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2021-2022 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package secboot_test
import (
"bytes"
"crypto"
"crypto/aes"
"crypto/cipher"
"crypto/hmac"
_ "crypto/sha256"
_ "crypto/sha512"
"encoding/asn1"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"hash"
"io"
"io/ioutil"
"math/rand"
"time"
. "github.com/snapcore/secboot"
"github.com/snapcore/secboot/internal/testutil"
snapd_testutil "github.com/snapcore/snapd/testutil"
"golang.org/x/crypto/cryptobyte"
cryptobyte_asn1 "golang.org/x/crypto/cryptobyte/asn1"
"golang.org/x/crypto/hkdf"
. "gopkg.in/check.v1"
)
type mockPlatformKeyDataHandle struct {
Key []byte `json:"key"`
IV []byte `json:"iv"`
AuthKeyHMAC []byte `json:"auth-key-hmac"`
ExpectedGeneration int `json:"exp-generation"`
ExpectedKDFAlg crypto.Hash `json:"exp-kdf_alg"`
ExpectedAuthMode AuthMode `json:"exp-auth-mode"`
}
const (
mockPlatformDeviceStateOK = iota
mockPlatformDeviceStateUnavailable
mockPlatformDeviceStateUninitialized
)
type mockPlatformKeyDataHandler struct {
state int
passphraseSupport bool
}
func (h *mockPlatformKeyDataHandler) checkState() error {
switch h.state {
case mockPlatformDeviceStateUnavailable:
return &PlatformHandlerError{Type: PlatformHandlerErrorUnavailable, Err: errors.New("the platform device is unavailable")}
case mockPlatformDeviceStateUninitialized:
return &PlatformHandlerError{Type: PlatformHandlerErrorUninitialized, Err: errors.New("the platform device is uninitialized")}
default:
return nil
}
}
func (h *mockPlatformKeyDataHandler) unmarshalHandle(data *PlatformKeyData) (*mockPlatformKeyDataHandle, error) {
var handle mockPlatformKeyDataHandle
if err := json.Unmarshal(data.EncodedHandle, &handle); err != nil {
return nil, &PlatformHandlerError{Type: PlatformHandlerErrorInvalidData, Err: fmt.Errorf("JSON decode error: %w", err)}
}
if data.Generation != handle.ExpectedGeneration {
return nil, &PlatformHandlerError{Type: PlatformHandlerErrorInvalidData, Err: errors.New("unexpected generation")}
}
if data.Generation > 1 {
if data.KDFAlg != handle.ExpectedKDFAlg {
return nil, &PlatformHandlerError{Type: PlatformHandlerErrorInvalidData, Err: errors.New("unexpected KDFAlg")}
}
}
if data.AuthMode != handle.ExpectedAuthMode {
return nil, &PlatformHandlerError{Type: PlatformHandlerErrorInvalidData, Err: errors.New("unexpected AuthMode")}
}
return &handle, nil
}
func (h *mockPlatformKeyDataHandler) checkKey(handle *mockPlatformKeyDataHandle, key []byte) error {
m := hmac.New(func() hash.Hash { return crypto.SHA256.New() }, handle.Key)
m.Write(key)
if !bytes.Equal(handle.AuthKeyHMAC, m.Sum(nil)) {
return &PlatformHandlerError{Type: PlatformHandlerErrorInvalidAuthKey, Err: errors.New("the supplied key is incorrect")}
}
return nil
}
func (h *mockPlatformKeyDataHandler) recoverKeys(handle *mockPlatformKeyDataHandle, payload []byte) ([]byte, error) {
b, err := aes.NewCipher(handle.Key)
if err != nil {
return nil, fmt.Errorf("cannot create cipher: %w", err)
}
s := cipher.NewCFBDecrypter(b, handle.IV)
out := make([]byte, len(payload))
s.XORKeyStream(out, payload)
return out, nil
}
func (h *mockPlatformKeyDataHandler) RecoverKeys(data *PlatformKeyData, encryptedPayload []byte) ([]byte, error) {
if err := h.checkState(); err != nil {
return nil, err
}
handle, err := h.unmarshalHandle(data)
if err != nil {
return nil, err
}
return h.recoverKeys(handle, encryptedPayload)
}
func (h *mockPlatformKeyDataHandler) RecoverKeysWithAuthKey(data *PlatformKeyData, encryptedPayload []byte, key []byte) ([]byte, error) {
if !h.passphraseSupport {
return nil, errors.New("not supported")
}
if err := h.checkState(); err != nil {
return nil, err
}
handle, err := h.unmarshalHandle(data)
if err != nil {
return nil, err
}
if err := h.checkKey(handle, key); err != nil {
return nil, err
}
return h.recoverKeys(handle, encryptedPayload)
}
func (h *mockPlatformKeyDataHandler) ChangeAuthKey(data *PlatformKeyData, old, new []byte) ([]byte, error) {
if !h.passphraseSupport {
return nil, errors.New("not supported")
}
if err := h.checkState(); err != nil {
return nil, err
}
handle, err := h.unmarshalHandle(data)
if err != nil {
return nil, err
}
if err := h.checkKey(handle, old); err != nil {
return nil, err
}
m := hmac.New(func() hash.Hash { return crypto.SHA256.New() }, handle.Key)
m.Write(new)
handle.AuthKeyHMAC = m.Sum(nil)
return json.Marshal(&handle)
}
type mockKeyDataWriter struct {
tmp *bytes.Buffer
final *bytes.Buffer
}
func (w *mockKeyDataWriter) Write(data []byte) (int, error) {
if w.tmp == nil {
return 0, errors.New("cancelled")
}
return w.tmp.Write(data)
}
func (w *mockKeyDataWriter) Cancel() error {
w.tmp = nil
return nil
}
func (w *mockKeyDataWriter) Commit() error {
if w.tmp == nil {
return errors.New("cancelled or already committed")
}
w.final = w.tmp
w.tmp = nil
return nil
}
func (w *mockKeyDataWriter) Reader() io.Reader {
return w.final
}
func makeMockKeyDataWriter() *mockKeyDataWriter {
return &mockKeyDataWriter{tmp: new(bytes.Buffer)}
}
type mockKeyDataReader struct {
readableName string
io.Reader
}
func (r *mockKeyDataReader) ReadableName() string {
return r.readableName
}
func toHash(c *C, v interface{}) crypto.Hash {
str, ok := v.(string)
c.Assert(ok, testutil.IsTrue)
switch str {
case "sha1":
return crypto.SHA1
case "sha224":
return crypto.SHA224
case "sha256":
return crypto.SHA256
case "sha384":
return crypto.SHA384
case "sha512":
return crypto.SHA512
default:
c.Fatalf("unrecognized hash algorithm")
}
return crypto.Hash(0)
}
type keyDataTestBase struct {
handler *mockPlatformKeyDataHandler
mockPlatformName string
}
func (s *keyDataTestBase) SetUpSuite(c *C) {
s.handler = &mockPlatformKeyDataHandler{}
s.mockPlatformName = "mock"
RegisterPlatformKeyDataHandler(s.mockPlatformName, s.handler)
}
func (s *keyDataTestBase) SetUpTest(c *C) {
s.handler.state = mockPlatformDeviceStateOK
s.handler.passphraseSupport = false
}
func (s *keyDataTestBase) TearDownSuite(c *C) {
RegisterPlatformKeyDataHandler(s.mockPlatformName, nil)
}
func (s *keyDataTestBase) newPrimaryKey(c *C, sz1 int) PrimaryKey {
primaryKey := make(PrimaryKey, sz1)
_, err := rand.Read(primaryKey)
c.Assert(err, IsNil)
return primaryKey
}
func (s *keyDataTestBase) mockProtectKeys(c *C, primaryKey PrimaryKey, kdfAlg crypto.Hash, modelAuthHash crypto.Hash) (out *KeyParams, unlockKey DiskUnlockKey) {
unique := make([]byte, len(primaryKey))
_, err := rand.Read(unique)
c.Assert(err, IsNil)
unlockKey, payload, err := MakeDiskUnlockKey(bytes.NewReader(unique), kdfAlg, primaryKey)
c.Assert(err, IsNil)
k := make([]byte, 48)
_, err = rand.Read(k)
c.Assert(err, IsNil)
handle := mockPlatformKeyDataHandle{
Key: k[:32],
IV: k[32:],
ExpectedGeneration: KeyDataGeneration,
ExpectedKDFAlg: kdfAlg,
ExpectedAuthMode: AuthModeNone,
}
h := hmac.New(func() hash.Hash { return crypto.SHA256.New() }, handle.Key)
h.Write(make([]byte, 32))
handle.AuthKeyHMAC = h.Sum(nil)
b, err := aes.NewCipher(handle.Key)
c.Assert(err, IsNil)
stream := cipher.NewCFBEncrypter(b, handle.IV)
out = &KeyParams{
PlatformName: s.mockPlatformName,
Handle: &handle,
EncryptedPayload: make([]byte, len(payload)),
KDFAlg: kdfAlg}
stream.XORKeyStream(out.EncryptedPayload, payload)
return out, unlockKey
}
func (s *keyDataTestBase) mockProtectKeysWithPassphrase(c *C, primaryKey PrimaryKey, kdfOptions *Argon2Options, authKeySize int, KDFAlg crypto.Hash, modelAuthHash crypto.Hash) (out *KeyWithPassphraseParams, unlockKey DiskUnlockKey) {
kp, unlockKey := s.mockProtectKeys(c, primaryKey, KDFAlg, modelAuthHash)
expectedHandle, ok := kp.Handle.(*mockPlatformKeyDataHandle)
c.Assert(ok, testutil.IsTrue)
expectedHandle.ExpectedAuthMode = AuthModePassphrase
expectedHandle.ExpectedGeneration = KeyDataGeneration
expectedHandle.ExpectedKDFAlg = KDFAlg
if kdfOptions == nil {
var defaultOptions Argon2Options
kdfOptions = &defaultOptions
}
kpp := &KeyWithPassphraseParams{
KeyParams: *kp,
KDFOptions: kdfOptions,
AuthKeySize: authKeySize,
}
return kpp, unlockKey
}
func (s *keyDataTestBase) checkKeyDataJSONDecodedLegacyFields(c *C, j map[string]interface{}, creationParams *KeyParams, nmodels int) {
snapModelAuthHash := crypto.SHA256
m, ok := j["authorized_snap_models"].(map[string]interface{})
c.Assert(ok, testutil.IsTrue)
h := toHash(c, m["alg"])
c.Check(h, Equals, snapModelAuthHash)
c.Check(m, testutil.HasKey, "hmacs")
if nmodels == 0 {
c.Check(m["hmacs"], IsNil)
} else {
c.Check(m["hmacs"], HasLen, nmodels)
hmacs, ok := m["hmacs"].([]interface{})
c.Check(ok, testutil.IsTrue)
for _, v := range hmacs {
str, ok := v.(string)
c.Check(ok, testutil.IsTrue)
digest, err := base64.StdEncoding.DecodeString(str)
c.Check(err, IsNil)
c.Check(digest, HasLen, h.Size())
}
}
h = toHash(c, m["kdf_alg"])
c.Check(h, Equals, snapModelAuthHash)
m1, ok := m["key_digest"].(map[string]interface{})
c.Assert(ok, testutil.IsTrue)
h = toHash(c, m1["alg"])
c.Check(h, Equals, snapModelAuthHash)
str, ok := m1["salt"].(string)
c.Check(ok, testutil.IsTrue)
salt, err := base64.StdEncoding.DecodeString(str)
c.Check(err, IsNil)
c.Check(salt, HasLen, 32)
str, ok = m1["digest"].(string)
c.Check(ok, testutil.IsTrue)
digest, err := base64.StdEncoding.DecodeString(str)
c.Check(err, IsNil)
c.Check(digest, HasLen, h.Size())
}
func (s *keyDataTestBase) checkKeyDataJSONCommon(c *C, j map[string]interface{}, creationParams *KeyParams, nmodels int) {
c.Check(j["platform_name"], Equals, creationParams.PlatformName)
expectedHandle, ok := creationParams.Handle.(*mockPlatformKeyDataHandle)
c.Assert(ok, testutil.IsTrue)
handleBytes, err := json.Marshal(j["platform_handle"])
c.Check(err, IsNil)
var handle *mockPlatformKeyDataHandle
c.Check(json.Unmarshal(handleBytes, &handle), IsNil)
c.Check(handle.Key, DeepEquals, expectedHandle.Key)
c.Check(handle.IV, DeepEquals, expectedHandle.IV)
_, ok = j["kdf_alg"].(string)
c.Check(ok, testutil.IsTrue)
generation, ok := j["generation"].(float64)
c.Check(ok, testutil.IsTrue)
c.Check(generation, Equals, float64(expectedHandle.ExpectedGeneration))
}
func (s *keyDataTestBase) checkKeyDataJSONDecodedAuthModeNone(c *C, j map[string]interface{}, creationParams *KeyParams, nmodels int) {
s.checkKeyDataJSONCommon(c, j, creationParams, nmodels)
str, ok := j["encrypted_payload"].(string)
c.Check(ok, testutil.IsTrue)
encryptedPayload, err := base64.StdEncoding.DecodeString(str)
c.Check(err, IsNil)
c.Check(encryptedPayload, DeepEquals, creationParams.EncryptedPayload)
c.Check(j, Not(testutil.HasKey), "passphrase_params")
}
func (s *keyDataTestBase) checkKeyDataJSONFromReaderAuthModeNone(c *C, r io.Reader, creationParams *KeyParams, nmodels int) {
var j map[string]interface{}
d := json.NewDecoder(r)
c.Check(d.Decode(&j), IsNil)
s.checkKeyDataJSONDecodedAuthModeNone(c, j, creationParams, nmodels)
}
func (s *keyDataTestBase) checkKeyDataJSONDecodedAuthModePassphrase(c *C, j map[string]interface{}, creationParams *KeyWithPassphraseParams, nmodels int, passphrase string, kdfOpts *Argon2Options) {
if kdfOpts == nil {
var def Argon2Options
kdfOpts = &def
}
kdfParams, err := kdfOpts.KdfParams(0)
c.Assert(err, IsNil)
s.checkKeyDataJSONCommon(c, j, &creationParams.KeyParams, nmodels)
p, ok := j["passphrase_params"].(map[string]interface{})
c.Check(ok, testutil.IsTrue)
encryption, ok := p["encryption"].(string)
c.Check(ok, testutil.IsTrue)
c.Check(encryption, Equals, "aes-cfb")
derivedKeySize, ok := p["derived_key_size"].(float64)
c.Check(ok, testutil.IsTrue)
c.Check(derivedKeySize, Equals, float64(32))
encryptionKeySize, ok := p["encryption_key_size"].(float64)
c.Check(ok, testutil.IsTrue)
c.Check(encryptionKeySize, Equals, float64(32))
authKeySize, ok := p["auth_key_size"].(float64)
c.Check(ok, testutil.IsTrue)
c.Check(authKeySize, Equals, float64(32))
k, ok := p["kdf"].(map[string]interface{})
c.Check(ok, testutil.IsTrue)
str, ok := k["type"].(string)
c.Check(ok, testutil.IsTrue)
c.Check(str, Equals, "argon2id")
str, ok = k["salt"].(string)
c.Check(ok, testutil.IsTrue)
salt, err := base64.StdEncoding.DecodeString(str)
c.Check(err, IsNil)
time, ok := k["time"].(float64)
c.Check(ok, testutil.IsTrue)
c.Check(time, Equals, float64(kdfParams.Time))
memory, ok := k["memory"].(float64)
c.Check(ok, testutil.IsTrue)
c.Check(memory, Equals, float64(kdfParams.Memory))
cpus, ok := k["cpus"].(float64)
c.Check(ok, testutil.IsTrue)
c.Check(cpus, Equals, float64(kdfParams.CPUs))
str, ok = j["encrypted_payload"].(string)
c.Check(ok, testutil.IsTrue)
encryptedPayload, err := base64.StdEncoding.DecodeString(str)
c.Check(err, IsNil)
// TODO properly unmarshal from field
// and expose HashAlg helpers
kdfAlg := crypto.SHA256
sha256Oid := asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 2, 1}
builder := cryptobyte.NewBuilder(nil)
builder.AddASN1(cryptobyte_asn1.SEQUENCE, func(b *cryptobyte.Builder) { // SEQUENCE {
b.AddASN1OctetString(salt) // salt OCTET STRING
// kdfAlg.marshalASN1(b) // kdfAlgorithm AlgorithmIdentifier
b.AddASN1(cryptobyte_asn1.SEQUENCE, func(b *cryptobyte.Builder) {
b.AddASN1ObjectIdentifier(sha256Oid) // algorithm OBJECT IDENTIFIER
b.AddASN1NULL() // parameters ANY DEFINED BY algorithm OPTIONAL
})
b.AddASN1(cryptobyte_asn1.UTF8String, func(b *cryptobyte.Builder) { // encryption UTF8String
b.AddBytes([]byte(encryption))
})
b.AddASN1Int64(int64(encryptionKeySize)) // encryptionKeySize INTEGER
b.AddASN1Int64(int64(authKeySize)) // authKeySize INTEGER
})
asnsalt, err := builder.Bytes()
c.Assert(err, IsNil)
var kdf testutil.MockArgon2KDF
costParams := &Argon2CostParams{
Time: uint32(kdfParams.Time),
MemoryKiB: uint32(kdfParams.Memory),
Threads: uint8(kdfParams.CPUs),
}
derived, _ := kdf.Derive(passphrase, asnsalt, Argon2Mode(kdfParams.Type), costParams, uint32(derivedKeySize))
key := make([]byte, int(encryptionKeySize))
r := hkdf.Expand(func() hash.Hash { return kdfAlg.New() }, derived, []byte("PASSPHRASE-ENC"))
_, err = io.ReadFull(r, key)
c.Assert(err, IsNil)
iv := make([]byte, aes.BlockSize)
r = hkdf.Expand(func() hash.Hash { return kdfAlg.New() }, derived, []byte("PASSPHRASE-IV"))
_, err = io.ReadFull(r, iv)
c.Assert(err, IsNil)
b, err := aes.NewCipher(key)
c.Assert(err, IsNil)
stream := cipher.NewCFBDecrypter(b, iv)
payload := make([]byte, len(encryptedPayload))
stream.XORKeyStream(payload, encryptedPayload)
c.Check(payload, DeepEquals, creationParams.EncryptedPayload)
}
func (s *keyDataTestBase) checkKeyDataJSONFromReaderAuthModePassphrase(c *C, r io.Reader, creationParams *KeyWithPassphraseParams, nmodels int, passphrase string, kdfOpts *Argon2Options) {
var j map[string]interface{}
d := json.NewDecoder(r)
c.Check(d.Decode(&j), IsNil)
s.checkKeyDataJSONDecodedAuthModePassphrase(c, j, creationParams, nmodels, passphrase, kdfOpts)
}
type keyDataSuite struct {
snapd_testutil.BaseTest
keyDataTestBase
}
func (s *keyDataSuite) SetUpTest(c *C) {
s.BaseTest.SetUpTest(c)
s.keyDataTestBase.SetUpTest(c)
origKdf := SetArgon2KDF(&testutil.MockArgon2KDF{})
s.AddCleanup(func() { SetArgon2KDF(origKdf) })
}
var _ = Suite(&keyDataSuite{})
func (s *keyDataSuite) checkKeyDataJSONAuthModeNone(c *C, keyData *KeyData, creationParams *KeyParams, nmodels int) {
w := makeMockKeyDataWriter()
c.Check(keyData.WriteAtomic(w), IsNil)
s.checkKeyDataJSONFromReaderAuthModeNone(c, w.Reader(), creationParams, nmodels)
}
func (s *keyDataSuite) checkKeyDataJSONAuthModePassphrase(c *C, keyData *KeyData, creationParams *KeyWithPassphraseParams, nmodels int, passphrase string, kdfOpts *Argon2Options) {
w := makeMockKeyDataWriter()
c.Check(keyData.WriteAtomic(w), IsNil)
s.checkKeyDataJSONFromReaderAuthModePassphrase(c, w.Reader(), creationParams, nmodels, passphrase, kdfOpts)
}
type testKeyPayloadData struct {
primary PrimaryKey
unique []byte
}
func marshalASN1(c *C, primary PrimaryKey, unique []byte) []byte {
builder := cryptobyte.NewBuilder(nil)
builder.AddASN1(cryptobyte_asn1.SEQUENCE, func(b *cryptobyte.Builder) { // ProtectedKeys ::= SEQUENCE {
b.AddASN1OctetString(primary) // primary OCTETSTRING
b.AddASN1OctetString(unique) // unique OCTETSTRING
})
b, err := builder.Bytes()
c.Assert(err, IsNil)
return b
}
func (s *keyDataSuite) testKeyPayload(c *C, data *testKeyPayloadData) {
payload := marshalASN1(c, data.primary, data.unique)
pk, err := UnmarshalProtectedKeys(payload)
c.Check(err, IsNil)
unique := data.unique
if data.unique == nil {
unique = []uint8{}
}
c.Check(pk, DeepEquals, &ProtectedKeys{Primary: data.primary, Unique: unique})
}
func (s *keyDataSuite) TestKeyPayload1(c *C) {
primary := s.newPrimaryKey(c, 32)
// Not really a primary key just using the same method
// to generate a random value of the same size
unique := s.newPrimaryKey(c, 32)
s.testKeyPayload(c, &testKeyPayloadData{
primary: primary,
unique: unique})
}
func (s *keyDataSuite) TestKeyPayload2(c *C) {
primary := s.newPrimaryKey(c, 64)
unique := s.newPrimaryKey(c, 32)
s.testKeyPayload(c, &testKeyPayloadData{
primary: primary,
unique: unique})
}
func (s *keyDataSuite) TestKeyPayload3(c *C) {
primary := s.newPrimaryKey(c, 32)
s.testKeyPayload(c, &testKeyPayloadData{
primary: primary,
})
}
func (s *keyDataSuite) TestKeyPayloadUnmarshalInvalid1(c *C) {
payload := make([]byte, 66)
for i := range payload {
payload[i] = 0xff
}
pk, err := UnmarshalProtectedKeys(payload)
c.Check(err, ErrorMatches, "malformed input")
c.Check(pk, IsNil)
}
func (s *keyDataSuite) TestKeyPayloadUnmarshalInvalid2(c *C) {
builder := cryptobyte.NewBuilder(nil)
builder.AddASN1(cryptobyte_asn1.SEQUENCE, func(b *cryptobyte.Builder) { // ProtectedKeys ::= SEQUENCE {
})
payload, err := builder.Bytes()
c.Assert(err, IsNil)
pk, err := UnmarshalProtectedKeys(payload)
c.Check(err, ErrorMatches, "malformed primary key")
c.Check(pk, IsNil)
}
func (s *keyDataSuite) TestKeyPayloadUnmarshalInvalid3(c *C) {
random := s.newPrimaryKey(c, 32)
builder := cryptobyte.NewBuilder(nil)
builder.AddASN1(cryptobyte_asn1.SEQUENCE, func(b *cryptobyte.Builder) { // ProtectedKeys ::= SEQUENCE {
b.AddASN1OctetString(random) // primary OCTETSTRING
})
payload, err := builder.Bytes()
c.Assert(err, IsNil)
pk, err := UnmarshalProtectedKeys(payload)
c.Check(err, ErrorMatches, "malformed unique key")
c.Check(pk, IsNil)
}
type keyDataHasher struct {
hash.Hash
}
func (h *keyDataHasher) Commit() error { return nil }
func (s *keyDataSuite) TestKeyDataID(c *C) {
primaryKey := s.newPrimaryKey(c, 32)
protected, _ := s.mockProtectKeys(c, primaryKey, crypto.SHA256, crypto.SHA256)
keyData, err := NewKeyData(protected)
c.Assert(err, IsNil)
h := &keyDataHasher{Hash: crypto.SHA256.New()}
c.Check(keyData.WriteAtomic(h), IsNil)
id, err := keyData.UniqueID()
c.Check(err, IsNil)
c.Check(id, DeepEquals, KeyID(h.Sum(nil)))
}
func (s *keyDataSuite) TestNewKeyData(c *C) {
primaryKey := s.newPrimaryKey(c, 32)
protected, _ := s.mockProtectKeys(c, primaryKey, crypto.SHA256, crypto.SHA256)
keyData, err := NewKeyData(protected)
c.Check(keyData, NotNil)
c.Check(err, IsNil)
}
func (s *keyDataSuite) TestKeyDataPlatformName(c *C) {
primaryKey := s.newPrimaryKey(c, 32)
protected, _ := s.mockProtectKeys(c, primaryKey, crypto.SHA256, crypto.SHA256)
keyData, err := NewKeyData(protected)
c.Assert(err, IsNil)
c.Check(keyData.PlatformName(), Equals, s.mockPlatformName)
}
func (s *keyDataSuite) TestUnmarshalPlatformHandle(c *C) {
primaryKey := s.newPrimaryKey(c, 32)
protected, _ := s.mockProtectKeys(c, primaryKey, crypto.SHA256, crypto.SHA256)
keyData, err := NewKeyData(protected)
c.Assert(err, IsNil)
var handle *mockPlatformKeyDataHandle
c.Check(keyData.UnmarshalPlatformHandle(&handle), IsNil)
c.Check(handle, DeepEquals, protected.Handle)
}
func (s *keyDataSuite) TestMarshalAndUpdatePlatformHandle(c *C) {
primaryKey := s.newPrimaryKey(c, 32)
protected, _ := s.mockProtectKeys(c, primaryKey, crypto.SHA256, crypto.SHA256)
keyData, err := NewKeyData(protected)
c.Assert(err, IsNil)
handle := protected.Handle.(*mockPlatformKeyDataHandle)
rand.Read(handle.AuthKeyHMAC)
c.Check(keyData.MarshalAndUpdatePlatformHandle(&handle), IsNil)
protected.Handle = handle
s.checkKeyDataJSONAuthModeNone(c, keyData, protected, 0)
}
func (s *keyDataSuite) TestRecoverKeys(c *C) {
primaryKey := s.newPrimaryKey(c, 32)
protected, unlockKey := s.mockProtectKeys(c, primaryKey, crypto.SHA256, crypto.SHA256)
keyData, err := NewKeyData(protected)
c.Assert(err, IsNil)
recoveredUnlockKey, recoveredPrimaryKey, err := keyData.RecoverKeys()
c.Assert(err, IsNil)
c.Check(recoveredUnlockKey, DeepEquals, unlockKey)
c.Check(recoveredPrimaryKey, DeepEquals, primaryKey)
}
func (s *keyDataSuite) TestRecoverKeysUnrecognizedPlatform(c *C) {
primaryKey := s.newPrimaryKey(c, 32)
protected, _ := s.mockProtectKeys(c, primaryKey, crypto.SHA256, crypto.SHA256)
protected.PlatformName = "foo"
keyData, err := NewKeyData(protected)
c.Assert(err, IsNil)
recoveredKey, recoveredAuxKey, err := keyData.RecoverKeys()
c.Check(err, ErrorMatches, "no appropriate platform handler is registered")
c.Check(recoveredKey, IsNil)
c.Check(recoveredAuxKey, IsNil)
}
func (s *keyDataSuite) TestRecoverKeysInvalidData(c *C) {
primaryKey := s.newPrimaryKey(c, 32)
protected, _ := s.mockProtectKeys(c, primaryKey, crypto.SHA256, crypto.SHA256)
protected.Handle = []byte("\"\"")
keyData, err := NewKeyData(protected)
c.Assert(err, IsNil)
recoveredKey, recoveredAuxKey, err := keyData.RecoverKeys()
c.Check(err, ErrorMatches, "invalid key data: JSON decode error: json: cannot unmarshal string into Go value of type secboot_test.mockPlatformKeyDataHandle")
c.Check(recoveredKey, IsNil)
c.Check(recoveredAuxKey, IsNil)
}
func (s *keyDataSuite) testRecoverKeysWithPassphrase(c *C, passphrase string) {
s.handler.passphraseSupport = true
primaryKey := s.newPrimaryKey(c, 32)
protected, unlockKey := s.mockProtectKeysWithPassphrase(c, primaryKey, nil, 32, crypto.SHA256, crypto.SHA256)
keyData, err := NewKeyDataWithPassphrase(protected, passphrase)
c.Assert(err, IsNil)
recoveredUnlockKey, recoveredPrimaryKey, err := keyData.RecoverKeysWithPassphrase(passphrase)
c.Check(err, IsNil)
c.Check(recoveredUnlockKey, DeepEquals, unlockKey)
c.Check(recoveredPrimaryKey, DeepEquals, primaryKey)
}
func (s *keyDataSuite) TestRecoverKeysWithPassphrase1(c *C) {
s.testRecoverKeysWithPassphrase(c, "passphrase")
}
func (s *keyDataSuite) TestRecoverKeysWithPassphrase2(c *C) {
s.testRecoverKeysWithPassphrase(c, "1234")
}
type testRecoverKeysWithPassphraseErrorHandlingData struct {
kdfType string
errMsg string
derivedKeySize int
encryptionKeySize int
authKeySize int
}
func (s *keyDataSuite) testRecoverKeysWithPassphraseErrorHandling(c *C, data *testRecoverKeysWithPassphraseErrorHandlingData) {
s.handler.passphraseSupport = true
if data.kdfType == "" {
data.kdfType = "argon2i"
}
if data.derivedKeySize == 0 {
data.derivedKeySize = 32
}
if data.encryptionKeySize == 0 {
data.encryptionKeySize = 32
}
if data.authKeySize == 0 {
data.authKeySize = 32
}
j := []byte(
`{` +
`"generation":2,` +
`"platform_name":"mock",` +
`"platform_handle":` +
`{` +
`"key":"GtaI3cZX9H3Ig1YxSCPTxLshteV0AXK2pFgQuE5NRIQ=",` +
`"iv":"0VUZD/yYi6PfRzdPB0a1GA==",` +
`"auth-key-hmac":"7/AmPJvhwHNY/E1a3oEoqF5xjmt5FBr9YTppQvESUSY=",` +
`"exp-generation":2,` +
`"exp-kdf_alg":5,` +
`"exp-auth-mode":1},` +
`"kdf_alg":"sha256",` +
`"encrypted_payload":"m5Qz8plfHf+M51BJgTN35pUEKQhHLSz59y9miniM1pEeLeZMWSsLuUHRjL3n9azbxckIHOLYYmAyNg9bF7VoFcQWsHMeww==",` +
`"passphrase_params":` +
`{` +
`"kdf":` +
`{` +
`"type":"` + data.kdfType + `",` +
`"salt":"8A3SHdXVwCzEmD7YMKkyWw==",` +
`"time":4,` +
`"memory":1024063,` +
`"cpus":4},` +
`"encryption":"aes-cfb",` +
`"derived_key_size":` + fmt.Sprint(data.derivedKeySize) + `,` +
`"encryption_key_size":` + fmt.Sprint(data.encryptionKeySize) + `,` +
`"auth_key_size":` + fmt.Sprint(data.authKeySize) + `},` +
`"authorized_snap_models":` +
`{` +
`"alg":"sha256",` +
`"kdf_alg":"sha256",` +
`"key_digest":` +
`{` +
`"alg":"sha256",` +
`"salt":"FvNTIAyRqLt3dHi0vboZR8xUM7JLG3J/tu8Xt7qY8/A=",` +
`"digest":"2ueYVTxhTxFX64L4+afifv1G9Vaf97JdkyUZ7wxJgPs="},` +
`"hmacs":null}}
`)
keyData, err := ReadKeyData(&mockKeyDataReader{"foo", bytes.NewReader(j)})
c.Assert(err, IsNil)
_, _, err = keyData.RecoverKeysWithPassphrase("passphrase")
c.Check(err.Error(), Equals, data.errMsg)
}
func (s *keyDataSuite) TestRecoverKeysWithPassphraseNotSupportedKDF(c *C) {
s.testRecoverKeysWithPassphraseErrorHandling(c, &testRecoverKeysWithPassphraseErrorHandlingData{
kdfType: "other",
errMsg: "unexpected intermediate KDF type \"other\"",
})
}
func (s *keyDataSuite) TestRecoverKeysWithPassphraseInvalidDerivedKeySize(c *C) {
s.testRecoverKeysWithPassphraseErrorHandling(c, &testRecoverKeysWithPassphraseErrorHandlingData{
derivedKeySize: -1,
errMsg: "invalid derived key size (-1 bytes)",
})
}
func (s *keyDataSuite) TestRecoverKeysWithPassphraseInvalidEncryptionKeySizeSmall(c *C) {
s.testRecoverKeysWithPassphraseErrorHandling(c, &testRecoverKeysWithPassphraseErrorHandlingData{
encryptionKeySize: -1,
errMsg: "invalid encryption key size (-1 bytes)",
})
}
func (s *keyDataSuite) TestRecoverKeysWithPassphraseInvalidEncryptionKeySizeBig(c *C) {
s.testRecoverKeysWithPassphraseErrorHandling(c, &testRecoverKeysWithPassphraseErrorHandlingData{
encryptionKeySize: 33,
errMsg: "invalid encryption key size (33 bytes)",
})
}
func (s *keyDataSuite) TestRecoverKeysWithPassphraseInvalidAuthKeySize(c *C) {
s.testRecoverKeysWithPassphraseErrorHandling(c, &testRecoverKeysWithPassphraseErrorHandlingData{
authKeySize: -1,
errMsg: "invalid auth key size (-1 bytes)",
})
}
func (s *keyDataSuite) TestRecoverKeysWithPassphraseUnavailableKDF(c *C) {
restore := MockHashAlgAvailable()
defer restore()
s.testRecoverKeysWithPassphraseErrorHandling(c, &testRecoverKeysWithPassphraseErrorHandlingData{
errMsg: fmt.Sprintf("unavailable leaf KDF digest algorithm %d", crypto.SHA256),
})
}
func (s *keyDataSuite) TestRecoverKeysWithPassphraseAuthModeNone(c *C) {
// Test that RecoverKeyWithPassphrase for a key without a passphrase set fails
auxKey := s.newPrimaryKey(c, 32)
protected, _ := s.mockProtectKeys(c, auxKey, crypto.SHA256, crypto.SHA256)
keyData, err := NewKeyData(protected)
c.Assert(err, IsNil)
recoveredKey, recoveredAuxKey, err := keyData.RecoverKeysWithPassphrase("")
c.Check(err, ErrorMatches, "cannot recover key with passphrase")
c.Check(recoveredKey, IsNil)
c.Check(recoveredAuxKey, IsNil)
}
func (s *keyDataSuite) TestNewKeyDataWithPassphraseNotSupported(c *C) {
// Test that creation of a new key data with passphrase fails when the
// platform handler doesn't have passphrase support.
primaryKey := s.newPrimaryKey(c, 32)
passphraseParams, _ := s.mockProtectKeysWithPassphrase(c, primaryKey, nil, 32, crypto.SHA256, crypto.SHA256)
_, err := NewKeyDataWithPassphrase(passphraseParams, "passphrase")
c.Check(err, ErrorMatches, "cannot set passphrase: not supported")
}
func (s *keyDataSuite) TestChangePassphraseNotSupported(c *C) {
// Test that changing passphrase of a key data with a passphrase set
// fails when the platform handler doesn't have passphrase support.
j := []byte(
`{` +
`"generation":2,` +
`"platform_name":"mock",` +
`"platform_handle":` +
`{` +
`"key":"6yrcBpn9ZmjZgiLqFZtp1nns+3zjVo/yxrbSqwhTuf4=",` +
`"iv":"HDEMeSzmDmsGZTzVTOxPOw==",` +
`"auth-key-hmac":"WQ3rrqhi5TMVHYiP3j10UG0h2D8nKQ0cs9YvXZGzRA8="},` +
`"kdf_alg":"sha256",` +
`"encrypted_payload":"uAUgcV48QrqgOQL1dI+CRRdVTSzEnTguKW0HXQFnU2q1SjIi45AvbcawnUhQl2k8rl2SBDL2RS4uIBZDlFaWiAHbwmX9ig==",` +
`"passphrase_params":` +
`{` +
`"kdf":` +
`{` +
`"type":"argon2i",` +
`"salt":"Uj1araXwSDK+WlzQ8RNQMg==",` +
`"time":4,` +
`"memory":1024063,` +
`"cpus":4},` +
`"encryption":"aes-cfb",` +
`"derived_key_size":32,` +
`"encryption_key_size":32,` +
`"auth_key_size":32},` +
`"authorized_snap_models":` +
`{` +
`"alg":"sha256",` +
`"kdf_alg":"sha256",` +
`"key_digest":` +
`{` +
`"alg":"sha256",` +
`"salt":"KAToqFGUwszVEjyOmc0Pil5uuhouNhaVynRLllPx7dU=",` +
`"digest":"GegPT/eBoSl1X9m5pSYcgdme/NtRA2/W4q38WDz4HHQ="},` +
`"hmacs":null}}
`)
keyData, err := ReadKeyData(&mockKeyDataReader{Reader: bytes.NewReader(j)})
c.Assert(err, IsNil)
c.Check(keyData.ChangePassphrase("passphrase", ""), ErrorMatches, "cannot perform action because of an unexpected error: not supported")
}
func (s *keyDataSuite) TestChangePassphraseWithoutInitial(c *C) {
// Test that changing passphrase on a key data without a passphrase set fails.
j := []byte(
`{` +
`"generation":2,` +
`"platform_name":"mock",` +
`"platform_handle":` +
`{` +
`"key":"6yrcBpn9ZmjZgiLqFZtp1nns+3zjVo/yxrbSqwhTuf4=",` +
`"iv":"HDEMeSzmDmsGZTzVTOxPOw==",` +
`"auth-key-hmac":"WQ3rrqhi5TMVHYiP3j10UG0h2D8nKQ0cs9YvXZGzRA8="},` +
`"kdf_alg":"sha256",` +
`"encrypted_payload":"uAUgcV48QrqgOQL1dI+CRRdVTSzEnTguKW0HXQFnU2q1SjIi45AvbcawnUhQl2k8rl2SBDL2RS4uIBZDlFaWiAHbwmX9ig==",` +