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https://github.com/phpseclib/phpseclib.git
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Merge branch '2.0'
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terrafrost
commit
b5653538e2
@ -72,6 +72,23 @@ use phpseclib3\Exception\InsufficientSetupException;
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use phpseclib3\Common\Functions\Strings;
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use phpseclib3\Crypt\Common\AsymmetricKey;
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/**#@+
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* @access private
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*/
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/**
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* No compression
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*/
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define('NET_SSH2_COMPRESSION_NONE', 1);
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/**
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* zlib compression
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*/
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define('NET_SSH2_COMPRESSION_ZLIB', 2);
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/**
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* zlib@openssh.com
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*/
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define('NET_SSH2_COMPRESSION_ZLIB_AT_OPENSSH', 3);
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/**#@-*/
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/**
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* Pure-PHP implementation of SSHv2.
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*
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@ -1026,10 +1043,59 @@ class SSH2
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* The authentication methods that may productively continue authentication.
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*
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* @see https://tools.ietf.org/html/rfc4252#section-5.1
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* @var array|null
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* @var array|null
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* @access private
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*/
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private $auth_methods_to_continue = null;
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/**
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* Compression method
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*
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* @var int
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* @access private
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*/
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private $compress = NET_SSH2_COMPRESSION_NONE;
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/**
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* Decompression method
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*
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* @var resource|object
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* @access private
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*/
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private $decompress = NET_SSH2_COMPRESSION_NONE;
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/**
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* Compression context
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*
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* @var int
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* @access private
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*/
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private $compress_context;
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/**
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* Decompression context
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*
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* @var resource|object
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* @access private
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*/
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private $decompress_context;
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/**
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* Regenerate Compression Context
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*
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* @var bool
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* @access private
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*/
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private $regenerate_compression_context = false;
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/**
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* Regenerate Decompression Context
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*
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* @var bool
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* @access private
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*/
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private $regenerate_decompression_context = false;
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/**
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* Default Constructor.
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*
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@ -1542,19 +1608,25 @@ class SSH2
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throw new NoSupportedAlgorithmsException('No compatible server to client message authentication algorithms found');
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}
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$compression_map = [
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'none' => NET_SSH2_COMPRESSION_NONE,
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'zlib' => NET_SSH2_COMPRESSION_ZLIB,
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'zlib@openssh.com' => NET_SSH2_COMPRESSION_ZLIB_AT_OPENSSH
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];
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$compression_algorithm_in = self::array_intersect_first($s2c_compression_algorithms, $this->compression_algorithms_server_to_client);
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if ($compression_algorithm_in === false) {
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$this->disconnect_helper(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
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throw new NoSupportedAlgorithmsException('No compatible server to client compression algorithms found');
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}
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$this->decompress = $compression_algorithm_in == 'zlib';
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$this->decompress = $compression_map[$compression_algorithm_in];
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$compression_algorithm_out = self::array_intersect_first($c2s_compression_algorithms, $this->compression_algorithms_client_to_server);
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if ($compression_algorithm_out === false) {
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$this->disconnect_helper(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
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throw new NoSupportedAlgorithmsException('No compatible client to server compression algorithms found');
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}
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$this->compress = $compression_algorithm_out == 'zlib';
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$this->compress = $compression_map[$compression_algorithm_out];
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switch ($this->kex_algorithm) {
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case 'diffie-hellman-group15-sha512':
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@ -1887,6 +1959,8 @@ class SSH2
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$this->hmac_check->etm = preg_match('#-etm@openssh\.com$#', $mac_algorithm_in);
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}
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$this->regenerate_compression_context = $this->regenerate_decompression_context = true;
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return true;
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}
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@ -3198,7 +3272,7 @@ class SSH2
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if (!is_resource($this->fsock) || feof($this->fsock)) {
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$this->bitmap = 0;
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throw new ConnectionClosedException('Connection closed (by server) prematurely');
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throw new ConnectionClosedException('Connection closed (by server) prematurely ' . $elapsed . 's');
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}
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$start = microtime(true);
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@ -3327,9 +3401,41 @@ class SSH2
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}
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}
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//if ($this->decompress) {
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// $payload = gzinflate(substr($payload, 2));
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//}
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switch ($this->decompress) {
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case NET_SSH2_COMPRESSION_ZLIB_AT_OPENSSH:
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if (!$this->isAuthenticated()) {
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break;
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}
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case NET_SSH2_COMPRESSION_ZLIB:
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if ($this->regenerate_decompression_context) {
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$this->regenerate_decompression_context = false;
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$cmf = ord($payload[0]);
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$cm = $cmf & 0x0F;
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if ($cm != 8) { // deflate
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user_error("Only CM = 8 ('deflate') is supported ($cm)");
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}
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$cinfo = ($cmf & 0xF0) >> 4;
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if ($cinfo > 7) {
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user_error("CINFO above 7 is not allowed ($cinfo)");
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}
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$windowSize = 1 << ($cinfo + 8);
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$flg = ord($payload[1]);
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//$fcheck = $flg && 0x0F;
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if ((($cmf << 8) | $flg) % 31) {
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user_error('fcheck failed');
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}
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$fdict = boolval($flg & 0x20);
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$flevel = ($flg & 0xC0) >> 6;
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$this->decompress_context = inflate_init(ZLIB_ENCODING_RAW, ['window' => $cinfo + 8]);
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$payload = substr($payload, 2);
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}
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if ($this->decompress_context) {
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$payload = inflate_add($this->decompress_context, $payload, ZLIB_PARTIAL_FLUSH);
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}
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}
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$this->get_seq_no++;
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@ -3881,11 +3987,27 @@ class SSH2
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throw new ConnectionClosedException('Connection closed prematurely');
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}
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//if ($this->compress) {
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// // the -4 removes the checksum:
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// // http://php.net/function.gzcompress#57710
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// $data = substr(gzcompress($data), 0, -4);
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//}
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if (!isset($logged)) {
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$logged = $data;
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}
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switch ($this->compress) {
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case NET_SSH2_COMPRESSION_ZLIB_AT_OPENSSH:
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if (!$this->isAuthenticated()) {
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break;
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}
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case NET_SSH2_COMPRESSION_ZLIB:
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if (!$this->regenerate_compression_context) {
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$header = '';
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} else {
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$this->regenerate_compression_context = false;
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$this->compress_context = deflate_init(ZLIB_ENCODING_RAW, ['window' => 15]);
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$header = "\x78\x9C";
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}
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if ($this->compress_context) {
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$data = $header . deflate_add($this->compress_context, $data, ZLIB_PARTIAL_FLUSH);
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}
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}
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// 4 (packet length) + 1 (padding length) + 4 (minimal padding amount) == 9
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$packet_length = strlen($data) + 9;
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@ -3975,10 +4097,10 @@ class SSH2
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if (defined('NET_SSH2_LOGGING')) {
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$current = microtime(true);
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$message_number = isset($this->message_numbers[ord($data[0])]) ? $this->message_numbers[ord($data[0])] : 'UNKNOWN (' . ord($data[0]) . ')';
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$message_number = isset($this->message_numbers[ord($logged[0])]) ? $this->message_numbers[ord($logged[0])] : 'UNKNOWN (' . ord($logged[0]) . ')';
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$message_number = '-> ' . $message_number .
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' (since last: ' . round($current - $this->last_packet, 4) . ', network: ' . round($stop - $start, 4) . 's)';
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$this->append_log($message_number, isset($logged) ? $logged : $data);
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$this->append_log($message_number, $logged);
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$this->last_packet = $current;
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}
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@ -4562,10 +4684,12 @@ class SSH2
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*/
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public static function getSupportedCompressionAlgorithms()
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{
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return [
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'none' // REQUIRED no compression
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//'zlib' // OPTIONAL ZLIB (LZ77) compression
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];
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$algos = ['none']; // REQUIRED no compression
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if (function_exists('deflate_init')) {
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$algos[] = 'zlib@openssh.com'; // https://datatracker.ietf.org/doc/html/draft-miller-secsh-compression-delayed
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$algos[] = 'zlib';
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}
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return $algos;
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}
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/**
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@ -4580,18 +4704,24 @@ class SSH2
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{
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$this->connect();
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$compression_map = [
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NET_SSH2_COMPRESSION_NONE => 'none',
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NET_SSH2_COMPRESSION_ZLIB => 'zlib',
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NET_SSH2_COMPRESSION_ZLIB_AT_OPENSSH => 'zlib@openssh.com'
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];
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return [
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'kex' => $this->kex_algorithm,
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'hostkey' => $this->signature_format,
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'client_to_server' => [
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'crypt' => $this->encrypt->name,
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'mac' => $this->hmac_create->name,
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'comp' => 'none',
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'comp' => $compression_map[$this->compress],
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],
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'server_to_client' => [
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'crypt' => $this->decrypt->name,
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'mac' => $this->hmac_check->name,
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'comp' => 'none',
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'comp' => $compression_map[$this->decompress],
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]
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];
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}
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