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Merge pull request #759 from bantu/ssh2-function-key_exchange-no-static

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[2.0] SSH2: Remove all static variables as loadable classes may change at runtime.

* bantu/ssh2-function-key_exchange-no-static:
  SSH2: Remove all static variables as loadable classes may change at runtime.
This commit is contained in:
Andreas Fischer 2015-08-13 14:25:21 -04:00
commit f29805e394
1 changed files with 73 additions and 82 deletions
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155
phpseclib/Net/SSH2.php
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@ -1147,7 +1147,7 @@ class SSH2
*/
function _key_exchange($kexinit_payload_server)
{
static $kex_algorithms = array(
$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.
@ -1167,91 +1167,88 @@ class SSH2
);
}
static $server_host_key_algorithms = array(
$server_host_key_algorithms = array(
'ssh-rsa', // RECOMMENDED sign Raw RSA Key
'ssh-dss' // REQUIRED sign Raw DSS Key
);
static $encryption_algorithms = false;
if ($encryption_algorithms === false) {
$encryption_algorithms = array(
// from <http://tools.ietf.org/html/rfc4345#section-4>:
'arcfour256',
'arcfour128',
$encryption_algorithms = array(
// from <http://tools.ietf.org/html/rfc4345#section-4>:
'arcfour256',
'arcfour128',
//'arcfour', // OPTIONAL the ARCFOUR stream cipher with a 128-bit key
//'arcfour', // OPTIONAL the ARCFOUR stream cipher with a 128-bit key
// CTR modes from <http://tools.ietf.org/html/rfc4344#section-4>:
'aes128-ctr', // RECOMMENDED AES (Rijndael) in SDCTR mode, with 128-bit key
'aes192-ctr', // RECOMMENDED AES with 192-bit key
'aes256-ctr', // RECOMMENDED AES with 256-bit key
// CTR modes from <http://tools.ietf.org/html/rfc4344#section-4>:
'aes128-ctr', // RECOMMENDED AES (Rijndael) in SDCTR mode, with 128-bit key
'aes192-ctr', // RECOMMENDED AES with 192-bit key
'aes256-ctr', // RECOMMENDED AES with 256-bit key
'twofish128-ctr', // OPTIONAL Twofish in SDCTR mode, with 128-bit key
'twofish192-ctr', // OPTIONAL Twofish with 192-bit key
'twofish256-ctr', // OPTIONAL Twofish with 256-bit key
'twofish128-ctr', // OPTIONAL Twofish in SDCTR mode, with 128-bit key
'twofish192-ctr', // OPTIONAL Twofish with 192-bit key
'twofish256-ctr', // OPTIONAL Twofish with 256-bit key
'aes128-cbc', // RECOMMENDED AES with a 128-bit key
'aes192-cbc', // OPTIONAL AES with a 192-bit key
'aes256-cbc', // OPTIONAL AES in CBC mode, with a 256-bit key
'aes128-cbc', // RECOMMENDED AES with a 128-bit key
'aes192-cbc', // OPTIONAL AES with a 192-bit key
'aes256-cbc', // OPTIONAL AES in CBC mode, with a 256-bit key
'twofish128-cbc', // OPTIONAL Twofish with a 128-bit key
'twofish192-cbc', // OPTIONAL Twofish with a 192-bit key
'twofish256-cbc',
'twofish-cbc', // OPTIONAL alias for "twofish256-cbc"
// (this is being retained for historical reasons)
'twofish128-cbc', // OPTIONAL Twofish with a 128-bit key
'twofish192-cbc', // OPTIONAL Twofish with a 192-bit key
'twofish256-cbc',
'twofish-cbc', // OPTIONAL alias for "twofish256-cbc"
// (this is being retained for historical reasons)
'blowfish-ctr', // OPTIONAL Blowfish in SDCTR mode
'blowfish-ctr', // OPTIONAL Blowfish in SDCTR mode
'blowfish-cbc', // OPTIONAL Blowfish in CBC mode
'blowfish-cbc', // OPTIONAL Blowfish in CBC mode
'3des-ctr', // RECOMMENDED Three-key 3DES in SDCTR mode
'3des-ctr', // RECOMMENDED Three-key 3DES in SDCTR mode
'3des-cbc', // REQUIRED three-key 3DES in CBC mode
//'none' // OPTIONAL no encryption; NOT RECOMMENDED
'3des-cbc', // REQUIRED three-key 3DES in CBC mode
//'none' // OPTIONAL no encryption; NOT RECOMMENDED
);
if (extension_loaded('openssl') && !extension_loaded('mcrypt')) {
// OpenSSL does not support arcfour256 in any capacity and arcfour128 / arcfour support is limited to
// instances that do not use continuous buffers
$encryption_algorithms = array_diff(
$encryption_algorithms,
array('arcfour256', 'arcfour128', 'arcfour')
);
if (extension_loaded('openssl') && !extension_loaded('mcrypt')) {
// OpenSSL does not support arcfour256 in any capacity and arcfour128 / arcfour support is limited to
// instances that do not use continuous buffers
$encryption_algorithms = array_diff(
$encryption_algorithms,
array('arcfour256', 'arcfour128', 'arcfour')
);
}
if (class_exists('\phpseclib\Crypt\RC4') === false) {
$encryption_algorithms = array_diff(
$encryption_algorithms,
array('arcfour256', 'arcfour128', 'arcfour')
);
}
if (class_exists('\phpseclib\Crypt\Rijndael') === false) {
$encryption_algorithms = array_diff(
$encryption_algorithms,
array('aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'aes128-cbc', 'aes192-cbc', 'aes256-cbc')
);
}
if (class_exists('\phpseclib\Crypt\Twofish') === false) {
$encryption_algorithms = array_diff(
$encryption_algorithms,
array('twofish128-ctr', 'twofish192-ctr', 'twofish256-ctr', 'twofish128-cbc', 'twofish192-cbc', 'twofish256-cbc', 'twofish-cbc')
);
}
if (class_exists('\phpseclib\Crypt\Blowfish') === false) {
$encryption_algorithms = array_diff(
$encryption_algorithms,
array('blowfish-ctr', 'blowfish-cbc')
);
}
if (class_exists('\phpseclib\Crypt\TripleDES') === false) {
$encryption_algorithms = array_diff(
$encryption_algorithms,
array('3des-ctr', '3des-cbc')
);
}
$encryption_algorithms = array_values($encryption_algorithms);
}
if (class_exists('\phpseclib\Crypt\RC4') === false) {
$encryption_algorithms = array_diff(
$encryption_algorithms,
array('arcfour256', 'arcfour128', 'arcfour')
);
}
if (class_exists('\phpseclib\Crypt\Rijndael') === false) {
$encryption_algorithms = array_diff(
$encryption_algorithms,
array('aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'aes128-cbc', 'aes192-cbc', 'aes256-cbc')
);
}
if (class_exists('\phpseclib\Crypt\Twofish') === false) {
$encryption_algorithms = array_diff(
$encryption_algorithms,
array('twofish128-ctr', 'twofish192-ctr', 'twofish256-ctr', 'twofish128-cbc', 'twofish192-cbc', 'twofish256-cbc', 'twofish-cbc')
);
}
if (class_exists('\phpseclib\Crypt\Blowfish') === false) {
$encryption_algorithms = array_diff(
$encryption_algorithms,
array('blowfish-ctr', 'blowfish-cbc')
);
}
if (class_exists('\phpseclib\Crypt\TripleDES') === false) {
$encryption_algorithms = array_diff(
$encryption_algorithms,
array('3des-ctr', '3des-cbc')
);
}
$encryption_algorithms = array_values($encryption_algorithms);
$mac_algorithms = array(
// from <http://www.ietf.org/rfc/rfc6668.txt>:
'hmac-sha2-256',// RECOMMENDED HMAC-SHA256 (digest length = key length = 32)
@ -1263,7 +1260,7 @@ class SSH2
//'none' // OPTIONAL no MAC; NOT RECOMMENDED
);
static $compression_algorithms = array(
$compression_algorithms = array(
'none' // REQUIRED no compression
//'zlib' // OPTIONAL ZLIB (LZ77) compression
);
@ -1277,17 +1274,11 @@ class SSH2
));
}
static $str_kex_algorithms, $str_server_host_key_algorithms,
$encryption_algorithms_server_to_client, $mac_algorithms_server_to_client, $compression_algorithms_server_to_client,
$encryption_algorithms_client_to_server, $mac_algorithms_client_to_server, $compression_algorithms_client_to_server;
if (empty($str_kex_algorithms)) {
$str_kex_algorithms = implode(',', $kex_algorithms);
$str_server_host_key_algorithms = implode(',', $server_host_key_algorithms);
$encryption_algorithms_server_to_client = $encryption_algorithms_client_to_server = implode(',', $encryption_algorithms);
$mac_algorithms_server_to_client = $mac_algorithms_client_to_server = implode(',', $mac_algorithms);
$compression_algorithms_server_to_client = $compression_algorithms_client_to_server = implode(',', $compression_algorithms);
}
$str_kex_algorithms = implode(',', $kex_algorithms);
$str_server_host_key_algorithms = implode(',', $server_host_key_algorithms);
$encryption_algorithms_server_to_client = $encryption_algorithms_client_to_server = implode(',', $encryption_algorithms);
$mac_algorithms_server_to_client = $mac_algorithms_client_to_server = implode(',', $mac_algorithms);
$compression_algorithms_server_to_client = $compression_algorithms_client_to_server = implode(',', $compression_algorithms);
$client_cookie = Random::string(16);