mirror of
https://github.com/phpseclib/phpseclib.git
synced 2024-12-25 19:21:09 +00:00
SSH2: Add support for curve25519-sha256@libssh.org.txt via libsodium-php.
This commit is contained in:
Andreas Fischer
parent
27be192189
commit
58f8affcad
@ -55,6 +55,7 @@
|
||||
"squizlabs/php_codesniffer": "~2.0"
|
||||
},
|
||||
"suggest": {
|
||||
"ext-libsodium": "SSH2/SFTP can make use of some algorithms provided by the libsodium-php extension.",
|
||||
"ext-mcrypt": "Install the Mcrypt extension in order to speed up a wide variety of cryptographic operations.",
|
||||
"ext-gmp": "Install the GMP (GNU Multiple Precision) extension in order to speed up arbitrary precision integer arithmetic operations."
|
||||
},
|
||||
|
||||
2
composer.lock
generated
2
composer.lock
generated
@ -4,7 +4,7 @@
|
||||
"Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
|
||||
"This file is @generated automatically"
|
||||
],
|
||||
"hash": "a8adabfa04c250bbec41c87f79a59b31",
|
||||
"hash": "b24ab20be15b6312e532ee2ffa18d5fa",
|
||||
"packages": [],
|
||||
"packages-dev": [
|
||||
{
|
||||
|
||||
@ -953,7 +953,10 @@ class SSH2
|
||||
31 => 'NET_SSH2_MSG_KEXDH_GEX_GROUP',
|
||||
32 => 'NET_SSH2_MSG_KEXDH_GEX_INIT',
|
||||
33 => 'NET_SSH2_MSG_KEXDH_GEX_REPLY',
|
||||
34 => 'NET_SSH2_MSG_KEXDH_GEX_REQUEST')
|
||||
34 => 'NET_SSH2_MSG_KEXDH_GEX_REQUEST'),
|
||||
// RFC 5656 - Elliptic Curves (for curve25519-sha256@libssh.org)
|
||||
array(30 => 'NET_SSH2_MSG_KEX_ECDH_INIT',
|
||||
31 => 'NET_SSH2_MSG_KEX_ECDH_REPLY')
|
||||
);
|
||||
|
||||
if (is_resource($host)) {
|
||||
@ -1110,9 +1113,13 @@ class SSH2
|
||||
*/
|
||||
function _generate_identifier()
|
||||
{
|
||||
$identifier = 'SSH-2.0-phpseclib_0.3';
|
||||
$identifier = 'SSH-2.0-phpseclib_2.0';
|
||||
|
||||
$ext = array();
|
||||
if (extension_loaded('libsodium')) {
|
||||
$ext[] = 'libsodium';
|
||||
}
|
||||
|
||||
if (extension_loaded('openssl')) {
|
||||
$ext[] = 'openssl';
|
||||
} elseif (extension_loaded('mcrypt')) {
|
||||
@ -1141,11 +1148,24 @@ class SSH2
|
||||
function _key_exchange($kexinit_payload_server)
|
||||
{
|
||||
static $kex_algorithms = array(
|
||||
// Elliptic Curve Diffie-Hellman Key Agreement (ECDH) using
|
||||
// Curve25519. See doc/curve25519-sha256@libssh.org.txt in the
|
||||
// libssh repository for more information.
|
||||
'curve25519-sha256@libssh.org',
|
||||
|
||||
// Diffie-Hellman Key Agreement (DH) using integer modulo prime
|
||||
// groups.
|
||||
'diffie-hellman-group1-sha1', // REQUIRED
|
||||
'diffie-hellman-group14-sha1', // REQUIRED
|
||||
'diffie-hellman-group-exchange-sha1', // RFC 4419
|
||||
'diffie-hellman-group-exchange-sha256', // RFC 4419
|
||||
);
|
||||
if (!class_exists('\Sodium')) {
|
||||
$kex_algorithms = array_diff(
|
||||
$kex_algorithms,
|
||||
array('curve25519-sha256@libssh.org')
|
||||
);
|
||||
}
|
||||
|
||||
static $server_host_key_algorithms = array(
|
||||
'ssh-rsa', // RECOMMENDED sign Raw RSA Key
|
||||
@ -1359,115 +1379,124 @@ class SSH2
|
||||
return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
|
||||
}
|
||||
|
||||
$keyLength = $decryptKeyLength > $encryptKeyLength ? $decryptKeyLength : $encryptKeyLength;
|
||||
|
||||
// through diffie-hellman key exchange a symmetric key is obtained
|
||||
$kex_algorithm = $this->_array_intersect_first($kex_algorithms, $this->kex_algorithms);
|
||||
if ($kex_algorithm === false) {
|
||||
user_error('No compatible key exchange algorithms found');
|
||||
return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
|
||||
}
|
||||
if (strpos($kex_algorithm, 'diffie-hellman-group-exchange') === 0) {
|
||||
$dh_group_sizes_packed = pack(
|
||||
'NNN',
|
||||
$this->kex_dh_group_size_min,
|
||||
$this->kex_dh_group_size_preferred,
|
||||
$this->kex_dh_group_size_max
|
||||
);
|
||||
$packet = pack(
|
||||
'Ca*',
|
||||
NET_SSH2_MSG_KEXDH_GEX_REQUEST,
|
||||
$dh_group_sizes_packed
|
||||
);
|
||||
if (!$this->_send_binary_packet($packet)) {
|
||||
return false;
|
||||
}
|
||||
|
||||
$response = $this->_get_binary_packet();
|
||||
if ($response === false) {
|
||||
user_error('Connection closed by server');
|
||||
return false;
|
||||
}
|
||||
extract(unpack('Ctype', $this->_string_shift($response, 1)));
|
||||
if ($type != NET_SSH2_MSG_KEXDH_GEX_GROUP) {
|
||||
user_error('Expected SSH_MSG_KEX_DH_GEX_GROUP');
|
||||
return false;
|
||||
}
|
||||
// Only relevant in diffie-hellman-group-exchange-sha{1,256}, otherwise empty.
|
||||
$exchange_hash_rfc4419 = '';
|
||||
|
||||
extract(unpack('NprimeLength', $this->_string_shift($response, 4)));
|
||||
$primeBytes = $this->_string_shift($response, $primeLength);
|
||||
$prime = new BigInteger($primeBytes, -256);
|
||||
|
||||
extract(unpack('NgLength', $this->_string_shift($response, 4)));
|
||||
$gBytes = $this->_string_shift($response, $gLength);
|
||||
$g = new BigInteger($gBytes, -256);
|
||||
|
||||
$exchange_hash_rfc4419 = pack(
|
||||
'a*Na*Na*',
|
||||
$dh_group_sizes_packed,
|
||||
$primeLength,
|
||||
$primeBytes,
|
||||
$gLength,
|
||||
$gBytes
|
||||
);
|
||||
|
||||
$clientKexInitMessage = NET_SSH2_MSG_KEXDH_GEX_INIT;
|
||||
$serverKexReplyMessage = NET_SSH2_MSG_KEXDH_GEX_REPLY;
|
||||
if ($kex_algorithm === 'curve25519-sha256@libssh.org') {
|
||||
$x = Random::string(32);
|
||||
$eBytes = \Sodium::crypto_box_publickey_from_secretkey($x);
|
||||
$clientKexInitMessage = NET_SSH2_MSG_KEX_ECDH_INIT;
|
||||
$serverKexReplyMessage = NET_SSH2_MSG_KEX_ECDH_REPLY;
|
||||
$kexHash = new Hash('sha256');
|
||||
} else {
|
||||
switch ($kex_algorithm) {
|
||||
// see http://tools.ietf.org/html/rfc2409#section-6.2 and
|
||||
// http://tools.ietf.org/html/rfc2412, appendex E
|
||||
case 'diffie-hellman-group1-sha1':
|
||||
$prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' .
|
||||
'020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' .
|
||||
'4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
|
||||
'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF';
|
||||
break;
|
||||
// see http://tools.ietf.org/html/rfc3526#section-3
|
||||
case 'diffie-hellman-group14-sha1':
|
||||
$prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' .
|
||||
'020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' .
|
||||
'4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
|
||||
'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A163BF05' .
|
||||
'98DA48361C55D39A69163FA8FD24CF5F83655D23DCA3AD961C62F356208552BB' .
|
||||
'9ED529077096966D670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B' .
|
||||
'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718' .
|
||||
'3995497CEA956AE515D2261898FA051015728E5A8AACAA68FFFFFFFFFFFFFFFF';
|
||||
break;
|
||||
if (strpos($kex_algorithm, 'diffie-hellman-group-exchange') === 0) {
|
||||
$dh_group_sizes_packed = pack(
|
||||
'NNN',
|
||||
$this->kex_dh_group_size_min,
|
||||
$this->kex_dh_group_size_preferred,
|
||||
$this->kex_dh_group_size_max
|
||||
);
|
||||
$packet = pack(
|
||||
'Ca*',
|
||||
NET_SSH2_MSG_KEXDH_GEX_REQUEST,
|
||||
$dh_group_sizes_packed
|
||||
);
|
||||
if (!$this->_send_binary_packet($packet)) {
|
||||
return false;
|
||||
}
|
||||
|
||||
$response = $this->_get_binary_packet();
|
||||
if ($response === false) {
|
||||
user_error('Connection closed by server');
|
||||
return false;
|
||||
}
|
||||
extract(unpack('Ctype', $this->_string_shift($response, 1)));
|
||||
if ($type != NET_SSH2_MSG_KEXDH_GEX_GROUP) {
|
||||
user_error('Expected SSH_MSG_KEX_DH_GEX_GROUP');
|
||||
return false;
|
||||
}
|
||||
|
||||
extract(unpack('NprimeLength', $this->_string_shift($response, 4)));
|
||||
$primeBytes = $this->_string_shift($response, $primeLength);
|
||||
$prime = new BigInteger($primeBytes, -256);
|
||||
|
||||
extract(unpack('NgLength', $this->_string_shift($response, 4)));
|
||||
$gBytes = $this->_string_shift($response, $gLength);
|
||||
$g = new BigInteger($gBytes, -256);
|
||||
|
||||
$exchange_hash_rfc4419 = pack(
|
||||
'a*Na*Na*',
|
||||
$dh_group_sizes_packed,
|
||||
$primeLength,
|
||||
$primeBytes,
|
||||
$gLength,
|
||||
$gBytes
|
||||
);
|
||||
|
||||
$clientKexInitMessage = NET_SSH2_MSG_KEXDH_GEX_INIT;
|
||||
$serverKexReplyMessage = NET_SSH2_MSG_KEXDH_GEX_REPLY;
|
||||
} else {
|
||||
switch ($kex_algorithm) {
|
||||
// see http://tools.ietf.org/html/rfc2409#section-6.2 and
|
||||
// http://tools.ietf.org/html/rfc2412, appendex E
|
||||
case 'diffie-hellman-group1-sha1':
|
||||
$prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' .
|
||||
'020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' .
|
||||
'4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
|
||||
'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF';
|
||||
break;
|
||||
// see http://tools.ietf.org/html/rfc3526#section-3
|
||||
case 'diffie-hellman-group14-sha1':
|
||||
$prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' .
|
||||
'020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' .
|
||||
'4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
|
||||
'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A163BF05' .
|
||||
'98DA48361C55D39A69163FA8FD24CF5F83655D23DCA3AD961C62F356208552BB' .
|
||||
'9ED529077096966D670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B' .
|
||||
'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718' .
|
||||
'3995497CEA956AE515D2261898FA051015728E5A8AACAA68FFFFFFFFFFFFFFFF';
|
||||
break;
|
||||
}
|
||||
// For both diffie-hellman-group1-sha1 and diffie-hellman-group14-sha1
|
||||
// the generator field element is 2 (decimal) and the hash function is sha1.
|
||||
$g = new BigInteger(2);
|
||||
$prime = new BigInteger($prime, 16);
|
||||
$clientKexInitMessage = NET_SSH2_MSG_KEXDH_INIT;
|
||||
$serverKexReplyMessage = NET_SSH2_MSG_KEXDH_REPLY;
|
||||
}
|
||||
// For both diffie-hellman-group1-sha1 and diffie-hellman-group14-sha1
|
||||
// the generator field element is 2 (decimal) and the hash function is sha1.
|
||||
$g = new BigInteger(2);
|
||||
$prime = new BigInteger($prime, 16);
|
||||
$exchange_hash_rfc4419 = '';
|
||||
$clientKexInitMessage = NET_SSH2_MSG_KEXDH_INIT;
|
||||
$serverKexReplyMessage = NET_SSH2_MSG_KEXDH_REPLY;
|
||||
|
||||
switch ($kex_algorithm) {
|
||||
case 'diffie-hellman-group-exchange-sha256':
|
||||
$kexHash = new Hash('sha256');
|
||||
break;
|
||||
default:
|
||||
$kexHash = new Hash('sha1');
|
||||
}
|
||||
|
||||
/* To increase the speed of the key exchange, both client and server may
|
||||
reduce the size of their private exponents. It should be at least
|
||||
twice as long as the key material that is generated from the shared
|
||||
secret. For more details, see the paper by van Oorschot and Wiener
|
||||
[VAN-OORSCHOT].
|
||||
|
||||
-- http://tools.ietf.org/html/rfc4419#section-6.2 */
|
||||
$one = new BigInteger(1);
|
||||
$keyLength = min($kexHash->getLength(), max($encryptKeyLength, $decryptKeyLength));
|
||||
$max = $one->bitwise_leftShift(16 * $keyLength); // 2 * 8 * $keyLength
|
||||
$max = $max->subtract($one);
|
||||
|
||||
$x = $one->random($one, $max);
|
||||
$e = $g->modPow($x, $prime);
|
||||
|
||||
$eBytes = $e->toBytes(true);
|
||||
}
|
||||
|
||||
switch ($kex_algorithm) {
|
||||
case 'diffie-hellman-group-exchange-sha256':
|
||||
$kexHash = new Hash('sha256');
|
||||
break;
|
||||
default:
|
||||
$kexHash = new Hash('sha1');
|
||||
}
|
||||
|
||||
/* To increase the speed of the key exchange, both client and server may
|
||||
reduce the size of their private exponents. It should be at least
|
||||
twice as long as the key material that is generated from the shared
|
||||
secret. For more details, see the paper by van Oorschot and Wiener
|
||||
[VAN-OORSCHOT].
|
||||
|
||||
-- http://tools.ietf.org/html/rfc4419#section-6.2 */
|
||||
$one = new BigInteger(1);
|
||||
$keyLength = min($keyLength, $kexHash->getLength());
|
||||
$max = $one->bitwise_leftShift(16 * $keyLength); // 2 * 8 * $keyLength
|
||||
$max = $max->subtract($one);
|
||||
|
||||
$x = $one->random($one, $max);
|
||||
$e = $g->modPow($x, $prime);
|
||||
|
||||
$eBytes = $e->toBytes(true);
|
||||
$data = pack('CNa*', $clientKexInitMessage, strlen($eBytes), $eBytes);
|
||||
|
||||
if (!$this->_send_binary_packet($data)) {
|
||||
@ -1495,7 +1524,6 @@ class SSH2
|
||||
|
||||
$temp = unpack('Nlength', $this->_string_shift($response, 4));
|
||||
$fBytes = $this->_string_shift($response, $temp['length']);
|
||||
$f = new BigInteger($fBytes, -256);
|
||||
|
||||
$temp = unpack('Nlength', $this->_string_shift($response, 4));
|
||||
$this->signature = $this->_string_shift($response, $temp['length']);
|
||||
@ -1503,7 +1531,17 @@ class SSH2
|
||||
$temp = unpack('Nlength', $this->_string_shift($this->signature, 4));
|
||||
$this->signature_format = $this->_string_shift($this->signature, $temp['length']);
|
||||
|
||||
$key = $f->modPow($x, $prime);
|
||||
if ($kex_algorithm === 'curve25519-sha256@libssh.org') {
|
||||
if (strlen($fBytes) !== 32) {
|
||||
user_error('Received curve25519 public key of invalid length.');
|
||||
return false;
|
||||
}
|
||||
$key = new BigInteger(\Sodium::crypto_scalarmult($x, $fBytes), 256);
|
||||
\Sodium::sodium_memzero($x);
|
||||
} else {
|
||||
$f = new BigInteger($fBytes, -256);
|
||||
$key = $f->modPow($x, $prime);
|
||||
}
|
||||
$keyBytes = $key->toBytes(true);
|
||||
|
||||
$this->exchange_hash = pack(
|
||||
|
||||
@ -39,7 +39,11 @@ class Unit_Net_SSH2Test extends PhpseclibTestCase
|
||||
public function testGenerateIdentifier()
|
||||
{
|
||||
$identifier = $this->createSSHMock()->_generate_identifier();
|
||||
$this->assertStringStartsWith('SSH-2.0-phpseclib_0.3', $identifier);
|
||||
$this->assertStringStartsWith('SSH-2.0-phpseclib_2.0', $identifier);
|
||||
|
||||
if (extension_loaded('libsodium')) {
|
||||
$this->assertContains('libsodium', $identifier);
|
||||
}
|
||||
|
||||
if (extension_loaded('openssl')) {
|
||||
$this->assertContains('openssl', $identifier);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user