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SSH2: window size is server -> client, not client -> server

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This commit is contained in:
terrafrost 2013-05-13 22:37:32 -05:00
parent 06044e8632
commit 1e2d0ccd9f
2 changed files with 18 additions and 29 deletions
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4
phpseclib/Net/SFTP.php
View File

@ -384,7 +384,7 @@ class Net_SFTP extends Net_SSH2 {
return false;
}
$this->window_size_client_to_server[NET_SFTP_CHANNEL] = $this->window_size;
$this->window_size_server_to_client[NET_SFTP_CHANNEL] = $this->window_size;
$packet = pack('CNa*N3',
NET_SSH2_MSG_CHANNEL_OPEN, strlen('session'), 'session', NET_SFTP_CHANNEL, $this->window_size, 0x4000);
@ -2204,4 +2204,4 @@ class Net_SFTP extends Net_SSH2 {
$this->pwd = false;
parent::_disconnect($reason);
}
}
}

43
phpseclib/Net/SSH2.php
View File

@ -609,7 +609,7 @@ class Net_SSH2 {
* @var Array
* @access private
*/
var $window_size_client_to_server = array();
var $window_size_server_to_client = array();
/**
* Server signature
@ -2016,13 +2016,13 @@ class Net_SSH2 {
// be adjusted". 0x7FFFFFFF is, at 2GB, the max size. technically, it should probably be decremented, but,
// honestly, if you're transfering more than 2GB, you probably shouldn't be using phpseclib, anyway.
// see http://tools.ietf.org/html/rfc4254#section-5.2 for more info
$this->window_size_client_to_server[NET_SSH2_CHANNEL_EXEC] = 0x7FFFFFFF;
$this->window_size_server_to_client[NET_SSH2_CHANNEL_EXEC] = 0x7FFFFFFF;
// 0x8000 is the maximum max packet size, per http://tools.ietf.org/html/rfc4253#section-6.1, although since PuTTy
// uses 0x4000, that's what will be used here, as well.
$packet_size = 0x4000;
$packet = pack('CNa*N3',
NET_SSH2_MSG_CHANNEL_OPEN, strlen('session'), 'session', NET_SSH2_CHANNEL_EXEC, $this->window_size_client_to_server[NET_SSH2_CHANNEL_EXEC], $packet_size);
NET_SSH2_MSG_CHANNEL_OPEN, strlen('session'), 'session', NET_SSH2_CHANNEL_EXEC, $this->window_size_server_to_client[NET_SSH2_CHANNEL_EXEC], $packet_size);
if (!$this->_send_binary_packet($packet)) {
return false;
@ -2119,11 +2119,11 @@ class Net_SSH2 {
return true;
}
$this->window_size_client_to_server[NET_SSH2_CHANNEL_SHELL] = 0x7FFFFFFF;
$this->window_size_server_to_client[NET_SSH2_CHANNEL_SHELL] = 0x7FFFFFFF;
$packet_size = 0x4000;
$packet = pack('CNa*N3',
NET_SSH2_MSG_CHANNEL_OPEN, strlen('session'), 'session', NET_SSH2_CHANNEL_SHELL, $this->window_size_client_to_server[NET_SSH2_CHANNEL_SHELL], $packet_size);
NET_SSH2_MSG_CHANNEL_OPEN, strlen('session'), 'session', NET_SSH2_CHANNEL_SHELL, $this->window_size_server_to_client[NET_SSH2_CHANNEL_SHELL], $packet_size);
if (!$this->_send_binary_packet($packet)) {
return false;
@ -2546,11 +2546,20 @@ class Net_SSH2 {
user_error('Connection closed by server');
return false;
}
if (!strlen($response)) {
return '';
}
// resize the window, if appropriate
$this->window_size_server_to_client[$client_channel]-= strlen($response);
if ($this->window_size_server_to_client[$client_channel] < 0) {
$packet = pack('CNN', NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST, $this->server_channels[$client_channel], $this->window_size);
if (!$this->_send_binary_packet($packet)) {
return false;
}
$this->window_size_server_to_client[$client_channel]+= $this->window_size;
}
extract(unpack('Ctype/Nchannel', $this->_string_shift($response, 5)));
switch ($this->channel_status[$channel]) {
@ -2810,16 +2819,6 @@ class Net_SSH2 {
function _send_channel_packet($client_channel, $data)
{
while (strlen($data) > $this->packet_size_client_to_server[$client_channel]) {
// resize the window, if appropriate
$this->window_size_client_to_server[$client_channel]-= $this->packet_size_client_to_server[$client_channel];
if ($this->window_size_client_to_server[$client_channel] < 0) {
$packet = pack('CNN', NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST, $this->server_channels[$client_channel], $this->window_size);
if (!$this->_send_binary_packet($packet)) {
return false;
}
$this->window_size_client_to_server[$client_channel]+= $this->window_size;
}
$packet = pack('CN2a*',
NET_SSH2_MSG_CHANNEL_DATA,
$this->server_channels[$client_channel],
@ -2832,16 +2831,6 @@ class Net_SSH2 {
}
}
// resize the window, if appropriate
$this->window_size_client_to_server[$client_channel]-= strlen($data);
if ($this->window_size_client_to_server[$client_channel] < 0) {
$packet = pack('CNN', NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST, $this->server_channels[$client_channel], $this->window_size);
if (!$this->_send_binary_packet($packet)) {
return false;
}
$this->window_size_client_to_server[$client_channel]+= $this->window_size;
}
return $this->_send_binary_packet(pack('CN2a*',
NET_SSH2_MSG_CHANNEL_DATA,
$this->server_channels[$client_channel],
@ -3311,4 +3300,4 @@ class Net_SSH2 {
}
return $this->exit_status;
}
}
}