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SSHi2: stop using dynamic properties in SymmetricKey

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This commit is contained in:
terrafrost 2022-01-30 01:36:02 -06:00
parent 0a9fc99dc8
commit 215fd61d12
2 changed files with 52 additions and 23 deletions
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7
phpseclib/Crypt/Common/SymmetricKey.php
View File

@ -213,13 +213,6 @@ abstract class SymmetricKey
self::ENGINE_OPENSSL_GCM => 'OpenSSL (GCM)' self::ENGINE_OPENSSL_GCM => 'OpenSSL (GCM)'
]; ];
/** @var string|null */
public $fixed;
/** @var string|null */
public $invocation_counter;
/** @var string|null */
public $name;
/** /**
* The Encryption Mode * The Encryption Mode
* *

68
phpseclib/Net/SSH2.php
View File

@ -410,6 +410,24 @@ class SSH2
*/ */
private $decrypt = false; private $decrypt = false;
/**
* Decryption Algorithm Name
*
* @var string|null
* @access private
*/
private $decryptName;
/**
* Decryption Invocation Counter
*
* Used by GCM
*
* @var string|null
* @access private
*/
private $decryptInvocationCounter;
/** /**
* Server to Client Length Encryption Object * Server to Client Length Encryption Object
* *
@ -428,6 +446,24 @@ class SSH2
*/ */
private $encrypt = false; private $encrypt = false;
/**
* Encryption Algorithm Name
*
* @var string|null
* @access private
*/
private $encryptName;
/**
* Encryption Invocation Counter
*
* Used by GCM
*
* @var string|null
* @access private
*/
private $encryptInvocationCounter;
/** /**
* Client to Server Length Encryption Object * Client to Server Length Encryption Object
* *
@ -1860,7 +1896,7 @@ class SSH2
case 'aes256-gcm@openssh.com': case 'aes256-gcm@openssh.com':
$nonce = $kexHash->hash($keyBytes . $this->exchange_hash . 'A' . $this->session_id); $nonce = $kexHash->hash($keyBytes . $this->exchange_hash . 'A' . $this->session_id);
$this->encrypt->fixed = substr($nonce, 0, 4); $this->encrypt->fixed = substr($nonce, 0, 4);
$this->encrypt->invocation_counter = substr($nonce, 4, 8); $this->encryptInvocationCounter = substr($nonce, 4, 8);
case 'chacha20-poly1305@openssh.com': case 'chacha20-poly1305@openssh.com':
break; break;
default: default:
@ -1878,7 +1914,7 @@ class SSH2
$this->lengthEncrypt->setKey(substr($key, 32, 32)); $this->lengthEncrypt->setKey(substr($key, 32, 32));
} }
$this->encrypt->setKey(substr($key, 0, $encryptKeyLength)); $this->encrypt->setKey(substr($key, 0, $encryptKeyLength));
$this->encrypt->name = $encrypt; $this->encryptName = $encrypt;
} }
$this->decrypt = self::encryption_algorithm_to_crypt_instance($decrypt); $this->decrypt = self::encryption_algorithm_to_crypt_instance($decrypt);
@ -1905,7 +1941,7 @@ class SSH2
// see https://tools.ietf.org/html/rfc5647#section-7.1 // see https://tools.ietf.org/html/rfc5647#section-7.1
$nonce = $kexHash->hash($keyBytes . $this->exchange_hash . 'B' . $this->session_id); $nonce = $kexHash->hash($keyBytes . $this->exchange_hash . 'B' . $this->session_id);
$this->decrypt->fixed = substr($nonce, 0, 4); $this->decrypt->fixed = substr($nonce, 0, 4);
$this->decrypt->invocation_counter = substr($nonce, 4, 8); $this->decryptInvocationCounter = substr($nonce, 4, 8);
case 'chacha20-poly1305@openssh.com': case 'chacha20-poly1305@openssh.com':
break; break;
default: default:
@ -1923,7 +1959,7 @@ class SSH2
$this->lengthDecrypt->setKey(substr($key, 32, 32)); $this->lengthDecrypt->setKey(substr($key, 32, 32));
} }
$this->decrypt->setKey(substr($key, 0, $decryptKeyLength)); $this->decrypt->setKey(substr($key, 0, $decryptKeyLength));
$this->decrypt->name = $decrypt; $this->decryptName = $decrypt;
} }
/* The "arcfour128" algorithm is the RC4 cipher, as described in /* The "arcfour128" algorithm is the RC4 cipher, as described in
@ -3367,14 +3403,14 @@ class SSH2
} }
if ($this->decrypt) { if ($this->decrypt) {
switch ($this->decrypt->name) { switch ($this->decryptName) {
case 'aes128-gcm@openssh.com': case 'aes128-gcm@openssh.com':
case 'aes256-gcm@openssh.com': case 'aes256-gcm@openssh.com':
$this->decrypt->setNonce( $this->decrypt->setNonce(
$this->decrypt->fixed . $this->decrypt->fixed .
$this->decrypt->invocation_counter $this->decryptInvocationCounter
); );
Strings::increment_str($this->decrypt->invocation_counter); Strings::increment_str($this->decryptInvocationCounter);
$this->decrypt->setAAD($temp = Strings::shift($raw, 4)); $this->decrypt->setAAD($temp = Strings::shift($raw, 4));
extract(unpack('Npacket_length', $temp)); extract(unpack('Npacket_length', $temp));
/** /**
@ -3552,9 +3588,9 @@ class SSH2
$adjustLength = false; $adjustLength = false;
if ($this->decrypt) { if ($this->decrypt) {
switch (true) { switch (true) {
case $this->decrypt->name == 'aes128-gcm@openssh.com': case $this->decryptName == 'aes128-gcm@openssh.com':
case $this->decrypt->name == 'aes256-gcm@openssh.com': case $this->decryptName == 'aes256-gcm@openssh.com':
case $this->decrypt->name == 'chacha20-poly1305@openssh.com': case $this->decryptName == 'chacha20-poly1305@openssh.com':
case $this->hmac_check instanceof Hash && $this->hmac_check->etm: case $this->hmac_check instanceof Hash && $this->hmac_check->etm:
$remaining_length+= $this->decrypt_block_size - 4; $remaining_length+= $this->decrypt_block_size - 4;
$adjustLength = true; $adjustLength = true;
@ -3566,7 +3602,7 @@ class SSH2
// PuTTY uses 0x9000 as the actual max packet size and so to shall we // PuTTY uses 0x9000 as the actual max packet size and so to shall we
// don't do this when GCM mode is used since GCM mode doesn't encrypt the length // don't do this when GCM mode is used since GCM mode doesn't encrypt the length
if ($remaining_length < -$this->decrypt_block_size || $remaining_length > 0x9000 || $remaining_length % $this->decrypt_block_size != 0) { if ($remaining_length < -$this->decrypt_block_size || $remaining_length > 0x9000 || $remaining_length % $this->decrypt_block_size != 0) {
if (!$this->bad_key_size_fix && self::bad_algorithm_candidate($this->decrypt ? $this->decrypt->name : '') && !($this->bitmap & SSH2::MASK_LOGIN)) { if (!$this->bad_key_size_fix && self::bad_algorithm_candidate($this->decrypt ? $this->decryptName : '') && !($this->bitmap & SSH2::MASK_LOGIN)) {
$this->bad_key_size_fix = true; $this->bad_key_size_fix = true;
$this->reset_connection(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); $this->reset_connection(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
return false; return false;
@ -4125,14 +4161,14 @@ class SSH2
} }
if ($this->encrypt) { if ($this->encrypt) {
switch ($this->encrypt->name) { switch ($this->encryptName) {
case 'aes128-gcm@openssh.com': case 'aes128-gcm@openssh.com':
case 'aes256-gcm@openssh.com': case 'aes256-gcm@openssh.com':
$this->encrypt->setNonce( $this->encrypt->setNonce(
$this->encrypt->fixed . $this->encrypt->fixed .
$this->encrypt->invocation_counter $this->encryptInvocationCounter
); );
Strings::increment_str($this->encrypt->invocation_counter); Strings::increment_str($this->encryptInvocationCounter);
$this->encrypt->setAAD($temp = ($packet & "\xFF\xFF\xFF\xFF")); $this->encrypt->setAAD($temp = ($packet & "\xFF\xFF\xFF\xFF"));
$packet = $temp . $this->encrypt->encrypt(substr($packet, 4)); $packet = $temp . $this->encrypt->encrypt(substr($packet, 4));
break; break;
@ -4798,12 +4834,12 @@ class SSH2
'kex' => $this->kex_algorithm, 'kex' => $this->kex_algorithm,
'hostkey' => $this->signature_format, 'hostkey' => $this->signature_format,
'client_to_server' => [ 'client_to_server' => [
'crypt' => $this->encrypt->name, 'crypt' => $this->encryptName,
'mac' => $this->hmac_create->name, 'mac' => $this->hmac_create->name,
'comp' => $compression_map[$this->compress], 'comp' => $compression_map[$this->compress],
], ],
'server_to_client' => [ 'server_to_client' => [
'crypt' => $this->decrypt->name, 'crypt' => $this->decryptName,
'mac' => $this->hmac_check->name, 'mac' => $this->hmac_check->name,
'comp' => $compression_map[$this->decompress], 'comp' => $compression_map[$this->decompress],
] ]