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https://github.com/phpseclib/phpseclib.git
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SSH2: add support for zlib and zlib@openssh.com compression
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terrafrost
parent
30a9a1541c
commit
da6c1b06bf
@ -150,6 +150,23 @@ define('NET_SSH2_READ_REGEX', 2);
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define('NET_SSH2_READ_NEXT', 3);
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/**#@-*/
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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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@ -980,8 +997,57 @@ class Net_SSH2
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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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* @access private
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*/
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private $auth_methods_to_continue = null;
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var $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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var $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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var $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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var $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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var $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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var $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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var $regenerate_decompression_context = false;
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/**
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* Default Constructor.
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@ -1590,19 +1656,25 @@ class Net_SSH2
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return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
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}
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$compression_map = array(
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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_out = $this->_array_intersect_first($c2s_compression_algorithms, $this->compression_algorithms_client_to_server);
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if ($compression_algorithm_out === false) {
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user_error('No compatible client to server compression algorithms found');
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return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
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}
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//$this->decompress = $compression_algorithm_out == 'zlib';
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$this->compress = $compression_map[$compression_algorithm_out];
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$compression_algorithm_in = $this->_array_intersect_first($s2c_compression_algorithms, $this->compression_algorithms_client_to_server);
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$compression_algorithm_in = $this->_array_intersect_first($s2c_compression_algorithms, $this->compression_algorithms_server_to_client);
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if ($compression_algorithm_in === false) {
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user_error('No compatible server to client compression algorithms found');
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return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
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}
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//$this->compress = $compression_algorithm_in == 'zlib';
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$this->decompress = $compression_map[$compression_algorithm_in];
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if (strpos($kex_algorithm, 'diffie-hellman-group-exchange') === 0) {
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$dh_group_sizes_packed = pack(
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@ -1996,6 +2068,8 @@ class Net_SSH2
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}
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$this->hmac_check->setKey(substr($key, 0, $checkKeyLength));
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$this->regenerate_compression_context = $this->regenerate_decompression_context = true;
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return true;
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}
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@ -3399,7 +3473,7 @@ class Net_SSH2
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if (!is_resource($this->fsock) || feof($this->fsock)) {
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$this->bitmap = 0;
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user_error('Connection closed (by server) prematurely');
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user_error('Connection closed (by server) prematurely ' . $elapsed . 's');
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return false;
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}
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@ -3470,9 +3544,41 @@ class Net_SSH2
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}
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}
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//if ($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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@ -4028,11 +4134,27 @@ class Net_SSH2
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return false;
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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($data) + 9;
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@ -4060,10 +4182,10 @@ class Net_SSH2
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if (defined('NET_SSH2_LOGGING')) {
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$current = strtok(microtime(), ' ') + strtok('');
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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 = $current;
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}
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@ -4746,10 +4868,12 @@ class Net_SSH2
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*/
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function getSupportedCompressionAlgorithms()
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{
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return array(
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'none' // REQUIRED no compression
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//'zlib' // OPTIONAL ZLIB (LZ77) compression
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);
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$algos = array('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 $algos;
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}
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/**
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@ -4764,18 +4888,24 @@ class Net_SSH2
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{
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$this->_connect();
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$compression_map = array(
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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 array(
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'kex' => $this->kex_algorithm,
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'hostkey' => $this->signature_format,
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'client_to_server' => array(
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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' => array(
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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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