Issue #3 - forgotten added new files

This commit is contained in:
Jakub Lehotsky 2018-11-05 23:01:53 +01:00
parent fdd1a727cb
commit 36f8e2d437
2 changed files with 854 additions and 0 deletions

571
crypto/keyring.go Normal file
View file

@ -0,0 +1,571 @@
package crypto
import (
"bytes"
"crypto/ecdsa"
"crypto/rsa"
"encoding/json"
"errors"
"io"
"io/ioutil"
"strings"
"time"
"github.com/ProtonMail/go-pm-crypto/models"
"golang.org/x/crypto/openpgp"
"golang.org/x/crypto/openpgp/armor"
pgperrors "golang.org/x/crypto/openpgp/errors"
"golang.org/x/crypto/openpgp/packet"
armorUtils "github.com/ProtonMail/go-pm-crypto/armor"
)
// A keypair contains a private key and a public key.
type pmKeyObject struct {
ID string
Version int
Flags int
Fingerprint string
PublicKey string `json:",omitempty"`
PrivateKey string
//Activation string // Undocumented
Primary int
}
func (ko *pmKeyObject) PrivateKeyReader() io.Reader {
return strings.NewReader(ko.PrivateKey)
}
// Identity contains the name and the email of a key holder.
type Identity struct {
Name string
Email string
}
// Signature is be used to check a signature. Because the signature is checked
// when the reader is consumed, Signature must only be used after EOF has been
// seen. A signature is only valid if s.Err() returns nil, otherwise the
// sender's identity cannot be trusted.
type Signature struct {
md *openpgp.MessageDetails
}
type SignedString struct {
String string
Signed *Signature
}
var errKeyringNotUnlocked = errors.New("pmapi: cannot sign message, key ring is not unlocked")
// Err returns a non-nil error if the signature is invalid.
func (s *Signature) Err() error {
return s.md.SignatureError
}
// KeyRing returns the key ring that was used to produce the signature, if
// available.
func (s *Signature) KeyRing() *KeyRing {
if s.md.SignedBy == nil {
return nil
}
return &KeyRing{
entities: openpgp.EntityList{s.md.SignedBy.Entity},
}
}
// IsBy returns true if the signature has been created by kr's owner.
func (s *Signature) IsBy(kr *KeyRing) bool {
// Use fingerprint if possible
if s.md.SignedBy != nil {
for _, e := range kr.entities {
if e.PrimaryKey.Fingerprint == s.md.SignedBy.PublicKey.Fingerprint {
return true
}
}
return false
}
for _, e := range kr.entities {
if e.PrimaryKey.KeyId == s.md.SignedByKeyId {
return true
}
}
return false
}
// A keyring contains multiple private and public keys.
type KeyRing struct {
// PGP entities in this keyring.
entities openpgp.EntityList
}
// Returns openpgp entities contained in this KeyRing
func (kr *KeyRing) GetEntities() openpgp.EntityList {
return kr.entities
}
// Encrypt encrypts data to this keyring's owner. If sign is not nil, it also
// signs data with it. sign must be unlock to be able to sign data, if it's not
// the case an error will be returned.
func (kr *KeyRing) Encrypt(w io.Writer, sign *KeyRing, filename string, canonicalizeText bool) (io.WriteCloser, error) {
// The API returns keys sorted by descending priority
// Only encrypt to the first one
var encryptEntities []*openpgp.Entity
for _, e := range kr.entities {
encryptEntities = append(encryptEntities, e)
break
}
var signEntity *openpgp.Entity
if sign != nil {
// To sign a message, the private key must be decrypted
for _, e := range sign.entities {
// Entity.PrivateKey must be a signing key
if e.PrivateKey != nil && !e.PrivateKey.Encrypted {
signEntity = e
break
}
}
if signEntity == nil {
return nil, errKeyringNotUnlocked
}
}
return EncryptCore(w, encryptEntities, signEntity, filename, canonicalizeText, func() time.Time { return GetPmCrypto().GetTime() })
}
// Helper common encryption method for desktop and mobile clients
func EncryptCore(w io.Writer, encryptEntities []*openpgp.Entity, signEntity *openpgp.Entity, filename string, canonicalizeText bool, timeGenerator func() time.Time) (io.WriteCloser, error) {
config := &packet.Config{DefaultCipher: packet.CipherAES256, Time: timeGenerator}
hints := &openpgp.FileHints{
IsBinary: !canonicalizeText,
FileName: filename,
}
if canonicalizeText {
return openpgp.EncryptText(w, encryptEntities, signEntity, hints, config)
} else {
return openpgp.Encrypt(w, encryptEntities, signEntity, hints, config)
}
}
// An io.WriteCloser that both encrypts and armors data.
type armorEncryptWriter struct {
aw io.WriteCloser // Armored writer
ew io.WriteCloser // Encrypted writer
}
// Encrypt data
func (w *armorEncryptWriter) Write(b []byte) (n int, err error) {
return w.ew.Write(b)
}
// Close armor and encryption io.WriteClose
func (w *armorEncryptWriter) Close() (err error) {
if err = w.ew.Close(); err != nil {
return
}
err = w.aw.Close()
return
}
// EncryptArmored encrypts and armors data to the keyring's owner.
func (kr *KeyRing) EncryptArmored(w io.Writer, sign *KeyRing) (wc io.WriteCloser, err error) {
aw, err := armorUtils.ArmorWithTypeBuffered(w, armorUtils.PGP_MESSAGE_HEADER)
if err != nil {
return
}
ew, err := kr.Encrypt(aw, sign, "", false)
if err != nil {
aw.Close()
return
}
wc = &armorEncryptWriter{aw: aw, ew: ew}
return
}
// EncryptString encrypts and armors a string to the keyring's owner.
func (kr *KeyRing) EncryptString(s string, sign *KeyRing) (encrypted string, err error) {
var b bytes.Buffer
w, err := kr.EncryptArmored(&b, sign)
if err != nil {
return
}
if _, err = w.Write([]byte(s)); err != nil {
return
}
if err = w.Close(); err != nil {
return
}
encrypted = b.String()
return
}
// Encrypts data using generated symmetric key encrypted with this KeyRing
func (kr *KeyRing) EncryptSymmetric(textToEncrypt string, canonicalizeText bool) (outSplit *models.EncryptedSplit, err error) {
var encryptedWriter io.WriteCloser
buffer := &bytes.Buffer{}
if encryptedWriter, err = kr.Encrypt(buffer, kr, "msg.txt", canonicalizeText); err != nil {
return
}
if _, err = io.Copy(encryptedWriter, bytes.NewBufferString(textToEncrypt)); err != nil {
return
}
encryptedWriter.Close()
if outSplit, err = SeparateKeyAndData(kr, buffer); err != nil {
return
}
return
}
// DecryptString decrypts an armored string sent to the keypair's owner.
// If error is errors.ErrSignatureExpired (from golang.org/x/crypto/openpgp/errors),
// contents are still provided if library clients wish to process this message further
func (kr *KeyRing) DecryptString(encrypted string) (SignedString, error) {
r, signed, err := kr.DecryptArmored(strings.NewReader(encrypted))
if err != nil && err != pgperrors.ErrSignatureExpired {
return SignedString{String: encrypted, Signed: nil}, err
}
b, err := ioutil.ReadAll(r)
if err != nil && err != pgperrors.ErrSignatureExpired {
return SignedString{String: encrypted, Signed: nil}, err
}
s := string(b)
return SignedString{String: s, Signed: signed}, nil
}
// Sign a string message, using this KeyRing. canonicalizeText identifies if newlines are canonicalized
func (kr *KeyRing) SignString(message string, canonicalizeText bool) (signed string, err error) {
var sig bytes.Buffer
err = kr.DetachedSign(&sig, strings.NewReader(message), canonicalizeText, true)
if err != nil {
return "", err
} else {
return sig.String(), nil
}
}
// Sign a separate ("detached") data from toSign, writing to w. canonicalizeText identifies if newlines are canonicalized
func (kr *KeyRing) DetachedSign(w io.Writer, toSign io.Reader, canonicalizeText bool, armored bool) (err error) {
var signEntity *openpgp.Entity
for _, e := range kr.entities {
if e.PrivateKey != nil && !e.PrivateKey.Encrypted {
signEntity = e
break
}
}
if signEntity == nil {
return errKeyringNotUnlocked
}
config := &packet.Config{DefaultCipher: packet.CipherAES256,
Time: func() time.Time {
return GetPmCrypto().GetTime()
},
}
if canonicalizeText {
err = openpgp.ArmoredDetachSignText(w, signEntity, toSign, config)
} else {
if armored {
err = openpgp.ArmoredDetachSign(w, signEntity, toSign, config)
} else {
err = openpgp.DetachSign(w, signEntity, toSign, config)
}
}
if err != nil {
return
}
return
}
// May return errors.ErrSignatureExpired (defined in golang.org/x/crypto/openpgp/errors)
// In this case signature has been verified successfuly, but it is either expired or
// in the future.
func (kr *KeyRing) VerifyString(message, signature string, sign *KeyRing) (err error) {
messageReader := strings.NewReader(message)
signatureReader := strings.NewReader(signature)
err = nil
if sign != nil {
for _, e := range sign.entities {
if e.PrivateKey != nil && !e.PrivateKey.Encrypted {
_, err = openpgp.CheckArmoredDetachedSignature(kr.entities, messageReader, signatureReader, nil)
if err == nil || err == pgperrors.ErrSignatureExpired {
return
}
}
}
}
if err == nil {
return errKeyringNotUnlocked
}
return err
}
// Unlock unlocks as many keys as possible with the following password. Note
// that keyrings can contain keys locked with different passwords, and thus
// err == nil does not mean that all keys have been successfully decrypted.
// If err != nil, the password is wrong for every key, and err is the last error
// encountered.
func (kr *KeyRing) Unlock(passphrase []byte) error {
// Build a list of keys to decrypt
var keys []*packet.PrivateKey
for _, e := range kr.entities {
// Entity.PrivateKey must be a signing key
if e.PrivateKey != nil {
keys = append(keys, e.PrivateKey)
}
// Entity.Subkeys can be used for encryption
for _, subKey := range e.Subkeys {
if subKey.PrivateKey != nil && (!subKey.Sig.FlagsValid || subKey.Sig.FlagEncryptStorage || subKey.Sig.FlagEncryptCommunications) {
keys = append(keys, subKey.PrivateKey)
}
}
}
if len(keys) == 0 {
return errors.New("pmapi: cannot unlock key ring, no private key available")
}
var err error
var n int
for _, key := range keys {
if !key.Encrypted {
continue // Key already decrypted
}
if err = key.Decrypt(passphrase); err == nil {
n++
}
}
if n == 0 {
return err
}
return nil
}
// Decrypt decrypts a message sent to the keypair's owner. If the message is not
// signed, signed will be nil.
// If error is errors.ErrSignatureExpired (from golang.org/x/crypto/openpgp/errors),
// contents are still provided if library clients wish to process this message further
func (kr *KeyRing) Decrypt(r io.Reader) (decrypted io.Reader, signed *Signature, err error) {
md, err := openpgp.ReadMessage(r, kr.entities, nil, nil)
if err != nil && err != pgperrors.ErrSignatureExpired {
return
}
decrypted = md.UnverifiedBody
if md.IsSigned {
signed = &Signature{md}
}
return
}
// DecryptArmored decrypts an armored message sent to the keypair's owner.
// If error is errors.ErrSignatureExpired (from golang.org/x/crypto/openpgp/errors),
// contents are still provided if library clients wish to process this message further
func (kr *KeyRing) DecryptArmored(r io.Reader) (decrypted io.Reader, signed *Signature, err error) {
block, err := armor.Decode(r)
if err != nil && err != pgperrors.ErrSignatureExpired {
return
}
if block.Type != armorUtils.PGP_MESSAGE_HEADER {
err = errors.New("pmapi: not an armored PGP message")
return
}
return kr.Decrypt(block.Body)
}
// WriteArmoredPublicKey outputs armored public keys from the keyring to w.
func (kr *KeyRing) WriteArmoredPublicKey(w io.Writer) (err error) {
aw, err := armor.Encode(w, openpgp.PublicKeyType, nil)
if err != nil {
return
}
for _, e := range kr.entities {
if err = e.Serialize(aw); err != nil {
aw.Close()
return
}
}
err = aw.Close()
return
}
// ArmoredPublicKeyString returns the armored public keys from this keyring.
func (kr *KeyRing) ArmoredPublicKeyString() (s string, err error) {
b := &bytes.Buffer{}
if err = kr.WriteArmoredPublicKey(b); err != nil {
return
}
s = b.String()
return
}
// readFrom reads unarmored and armored keys from r and adds them to the keyring.
func (kr *KeyRing) readFrom(r io.Reader, armored bool) error {
var err error
var entities openpgp.EntityList
if armored {
entities, err = openpgp.ReadArmoredKeyRing(r)
} else {
entities, err = openpgp.ReadKeyRing(r)
}
for _, entity := range entities {
if entity.PrivateKey != nil {
switch entity.PrivateKey.PrivateKey.(type) {
// TODO: type mismatch after crypto lib update, fix this:
case *rsa.PrivateKey:
//entity.PrimaryKey = packet.NewRSAPublicKey(time.Now(), entity.PrivateKey.PrivateKey.(*rsa.PrivateKey).Public().(*rsa.PublicKey))
case *ecdsa.PrivateKey:
entity.PrimaryKey = packet.NewECDSAPublicKey(time.Now(), entity.PrivateKey.PrivateKey.(*ecdsa.PrivateKey).Public().(*ecdsa.PublicKey))
}
}
for _, subkey := range entity.Subkeys {
if subkey.PrivateKey != nil {
switch subkey.PrivateKey.PrivateKey.(type) {
case *rsa.PrivateKey:
//subkey.PublicKey = packet.NewRSAPublicKey(time.Now(), subkey.PrivateKey.PrivateKey.(*rsa.PrivateKey).Public().(*rsa.PublicKey))
case *ecdsa.PrivateKey:
subkey.PublicKey = packet.NewECDSAPublicKey(time.Now(), subkey.PrivateKey.PrivateKey.(*ecdsa.PrivateKey).Public().(*ecdsa.PublicKey))
}
}
}
}
if err != nil {
return err
}
if len(entities) == 0 {
return errors.New("pmapi: key ring doesn't contain any key")
}
kr.entities = append(kr.entities, entities...)
return nil
}
// UnmarshalJSON implements encoding/json.Unmarshaler.
func (kr *KeyRing) UnmarshalJSON(b []byte) (err error) {
kr.entities = nil
keyObjs := []pmKeyObject{}
if err = json.Unmarshal(b, &keyObjs); err != nil {
return
}
if len(keyObjs) == 0 {
return
}
for _, ko := range keyObjs {
kr.readFrom(ko.PrivateKeyReader(), true)
}
return
}
// Identities returns the list of identities associated with this key ring.
func (kr *KeyRing) Identities() []*Identity {
var identities []*Identity
for _, e := range kr.entities {
for _, id := range e.Identities {
identities = append(identities, &Identity{
Name: id.UserId.Name,
Email: id.UserId.Email,
})
}
}
return identities
}
// Return array of IDs of keys in this KeyRing
func (kr *KeyRing) KeyIds() []uint64 {
var res []uint64
for _, e := range kr.entities {
res = append(res, e.PrimaryKey.KeyId)
}
return res
}
// ReadArmoredKeyRing reads an armored keyring.
func ReadArmoredKeyRing(r io.Reader) (kr *KeyRing, err error) {
kr = &KeyRing{}
err = kr.readFrom(r, true)
return
}
// ReadArmoredKeyRing reads an armored keyring.
func ReadKeyRing(r io.Reader) (kr *KeyRing, err error) {
kr = &KeyRing{}
err = kr.readFrom(r, false)
return
}
// Take a given KeyRing list and return only those KeyRings which contain at least, one unexpired Key
// Returns only unexpired parts of these KeyRings
func FilterExpiredKeys(contactKeys []*KeyRing) (filteredKeys []*KeyRing, err error) {
now := time.Now()
hasExpiredEntity := false
filteredKeys = make([]*KeyRing, 0, 0)
for _, contactKeyRing := range contactKeys {
keyRingHasUnexpiredEntity := false
keyRingHasTotallyExpiredEntity := false
for _, entity := range contactKeyRing.GetEntities() {
hasExpired := false
hasUnexpired := false
for _, subkey := range entity.Subkeys {
if subkey.Sig.KeyExpired(now) {
hasExpired = true
} else {
hasUnexpired = true
}
}
if hasExpired && !hasUnexpired {
keyRingHasTotallyExpiredEntity = true
} else if hasUnexpired {
keyRingHasUnexpiredEntity = true
}
}
if keyRingHasUnexpiredEntity {
filteredKeys = append(filteredKeys, contactKeyRing)
} else if keyRingHasTotallyExpiredEntity {
hasExpiredEntity = true
}
}
if len(filteredKeys) == 0 && hasExpiredEntity {
return filteredKeys, errors.New("all contacts keys are expired")
}
return
}

283
crypto/keyring_test.go Normal file
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@ -0,0 +1,283 @@
package crypto
import (
"bytes"
"golang.org/x/crypto/openpgp/armor"
"io/ioutil"
"strings"
"testing"
)
const testPrivateKey = `-----BEGIN PGP PRIVATE KEY BLOCK-----
Version: OpenPGP.js v0.7.1
Comment: http://openpgpjs.org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WAV/bGn1ODnszOYPk3pEMR6kKSxLLaO69kYx4eTERFyJ+1puAxEPCk3Cfeif
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5dy5/PgCI0Id+KAFHyKpJA0N0h8O4xdJoNyIBAwDZ8LHt0vlnLGwcJFR9X7/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=2wIY
-----END PGP PRIVATE KEY BLOCK-----
`
const testPrivateKeyLegacy = `-----BEGIN PGP PRIVATE KEY BLOCK-----
Version: OpenPGP.js v0.9.0
Comment: http://openpgpjs.org
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=Pyb1
-----END PGP PRIVATE KEY BLOCK-----
`
const testPublicKey = `-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: OpenPGP.js v0.7.1
Comment: http://openpgpjs.org
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+6qhkUJtzMaE3YEFEoQMGzcDTUEfXCJ3zJw=
=yT9U
-----END PGP PUBLIC KEY BLOCK-----
`
const testMailboxPassword = "apple"
const testMailboxPasswordLegacy = "123"
const testToken = "d79ca194a22810a5363eeddfdef7dfbc327c6229"
const testEncryptedToken = `-----BEGIN PGP MESSAGE-----
Version: OpenPGP.js v1.2.0
Comment: http://openpgpjs.org
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NNJgARWnwnOKtov2d73wGqNawn21SzA+zEd2mAPv1LPPIupW+0xOUSp5muov
aLEjcIuZeu+vyhXGZxIgoY4Bw8XCO9uWKZuzmqp+AOIP+kSi5aWnOaDFIOq0
B3KtZ33bMZeX
=mig5
-----END PGP MESSAGE-----
`
var (
testPrivateKeyRing *KeyRing
testPublicKeyRing *KeyRing
)
var testIdentity = &Identity{
Name: "UserID",
Email: "",
}
func init() {
var err error
if testPrivateKeyRing, err = ReadArmoredKeyRing(strings.NewReader(testPrivateKey)); err != nil {
panic(err)
}
if testPublicKeyRing, err = ReadArmoredKeyRing(strings.NewReader(testPublicKey)); err != nil {
panic(err)
}
if err := testPrivateKeyRing.Unlock([]byte(testMailboxPassword)); err != nil {
panic(err)
}
}
func TestKeyRing_Decrypt(t *testing.T) {
s, _, err := testPrivateKeyRing.DecryptString(testEncryptedToken)
if err != nil {
t.Fatal("Cannot decrypt token:", err)
}
if s != testToken {
t.Fatalf("Invalid decrypted token: want %v but got %v", testToken, s)
}
}
func TestKeyRing_Encrypt(t *testing.T) {
encrypted, err := testPublicKeyRing.EncryptString(testToken, nil)
if err != nil {
t.Fatal("Cannot encrypt token:", err)
}
// We can't just check if encrypted == testEncryptedToken
// Decrypt instead
s, _, err := testPrivateKeyRing.DecryptString(encrypted)
if err != nil {
t.Fatal("Cannot decrypt token:", err)
}
if s != testToken {
t.Fatalf("Invalid decrypted token: want %v but got %v", testToken, s)
}
}
func TestKeyRing_ArmoredPublicKeyString(t *testing.T) {
s, err := testPrivateKeyRing.ArmoredPublicKeyString()
if err != nil {
t.Fatal("Expected no error while getting armored public key, got:", err)
}
// Decode armored keys
block, err := armor.Decode(strings.NewReader(s))
if err != nil {
t.Fatal("Expected no error while decoding armored public key, got:", err)
}
expected, err := armor.Decode(strings.NewReader(testPublicKey))
if err != nil {
t.Fatal("Expected no error while decoding expected armored public key, got:", err)
}
if expected.Type != block.Type {
t.Fatalf("Invalid public key block type: expected %v, got %v", expected.Type, block.Type)
}
b, err := ioutil.ReadAll(block.Body)
if err != nil {
t.Fatal("Expected no error while reading armored public key body, got:", err)
}
eb, err := ioutil.ReadAll(expected.Body)
if err != nil {
t.Fatal("Expected no error while reading expected armored public key body, got:", err)
}
if bytes.Compare(eb, b) != 0 {
t.Fatal("Invalid public key body: expected %v, got %v", eb, b)
}
}