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SSH2: handle keepalive@openssh.com packets

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This commit is contained in:
terrafrost 2020-12-15 08:25:42 -06:00
parent 96c4c3bc58
commit 194e642448
1 changed files with 62 additions and 50 deletions
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112
phpseclib/Net/SSH2.php
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@ -3351,6 +3351,57 @@ class Net_SSH2
*/
function _get_binary_packet($skip_channel_filter = false)
{
if ($skip_channel_filter) {
$read = array($this->fsock);
$write = $except = null;
if ($this->curTimeout <= 0) {
if ($this->keepAlive <= 0) {
@stream_select($read, $write, $except, null);
} else {
if (!@stream_select($read, $write, $except, $this->keepAlive) && !count($read)) {
$this->_send_binary_packet(pack('CN', NET_SSH2_MSG_IGNORE, 0));
return $this->_get_binary_packet(true);
}
}
} else {
if ($this->curTimeout < 0) {
$this->is_timeout = true;
return true;
}
$read = array($this->fsock);
$write = $except = null;
$start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
if ($this->keepAlive > 0 && $this->keepAlive < $this->curTimeout) {
if (!@stream_select($read, $write, $except, $this->keepAlive) && !count($read)) {
$this->_send_binary_packet(pack('CN', NET_SSH2_MSG_IGNORE, 0));
$elapsed = strtok(microtime(), ' ') + strtok('') - $start;
$this->curTimeout-= $elapsed;
return $this->_get_binary_packet(true);
}
$elapsed = strtok(microtime(), ' ') + strtok('') - $start;
$this->curTimeout-= $elapsed;
}
$sec = floor($this->curTimeout);
$usec = 1000000 * ($this->curTimeout - $sec);
// on windows this returns a "Warning: Invalid CRT parameters detected" error
if (!@stream_select($read, $write, $except, $sec, $usec) && !count($read)) {
$this->is_timeout = true;
if ($client_channel == NET_SSH2_CHANNEL_EXEC && !$this->request_pty) {
$this->_close_channel($client_channel);
}
return true;
}
$elapsed = strtok(microtime(), ' ') + strtok('') - $start;
$this->curTimeout-= $elapsed;
}
}
if (!is_resource($this->fsock) || feof($this->fsock)) {
$this->bitmap = 0;
user_error('Connection closed prematurely');
@ -3502,9 +3553,19 @@ class Net_SSH2
// only called when we've already logged in
if (($this->bitmap & NET_SSH2_MASK_CONNECTED) && $this->isAuthenticated()) {
switch (ord($payload[0])) {
case NET_SSH2_MSG_CHANNEL_REQUEST:
if (strlen($payload) == 31) {
extract(unpack('cpacket_type/Nchannel/Nlength', $payload));
if (substr($payload, 9, $length) == 'keepalive@openssh.com' && isset($this->server_channels[$channel])) {
if (ord(substr($payload, 9 + $length))) { // want reply
$this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_SUCCESS, $this->server_channels[$channel]));
}
$payload = $this->_get_binary_packet($skip_channel_filter);
}
}
break;
case NET_SSH2_MSG_CHANNEL_DATA:
case NET_SSH2_MSG_CHANNEL_EXTENDED_DATA:
case NET_SSH2_MSG_CHANNEL_REQUEST:
case NET_SSH2_MSG_CHANNEL_CLOSE:
case NET_SSH2_MSG_CHANNEL_EOF:
if (!$skip_channel_filter && !empty($this->server_channels)) {
@ -3702,55 +3763,6 @@ class Net_SSH2
$response = $this->binary_packet_buffer;
$this->binary_packet_buffer = false;
} else {
$read = array($this->fsock);
$write = $except = null;
if ($this->curTimeout <= 0) {
if ($this->keepAlive <= 0) {
@stream_select($read, $write, $except, null);
} else {
if (!@stream_select($read, $write, $except, $this->keepAlive) && !count($read)) {
$this->_send_binary_packet(pack('CN', NET_SSH2_MSG_IGNORE, 0));
continue;
}
}
} else {
if ($this->curTimeout < 0) {
$this->is_timeout = true;
return true;
}
$read = array($this->fsock);
$write = $except = null;
$start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
if ($this->keepAlive > 0 && $this->keepAlive < $this->curTimeout) {
if (!@stream_select($read, $write, $except, $this->keepAlive) && !count($read)) {
$this->_send_binary_packet(pack('CN', NET_SSH2_MSG_IGNORE, 0));
$elapsed = strtok(microtime(), ' ') + strtok('') - $start;
$this->curTimeout-= $elapsed;
continue;
}
$elapsed = strtok(microtime(), ' ') + strtok('') - $start;
$this->curTimeout-= $elapsed;
}
$sec = floor($this->curTimeout);
$usec = 1000000 * ($this->curTimeout - $sec);
// on windows this returns a "Warning: Invalid CRT parameters detected" error
if (!@stream_select($read, $write, $except, $sec, $usec) && !count($read)) {
$this->is_timeout = true;
if ($client_channel == NET_SSH2_CHANNEL_EXEC && !$this->request_pty) {
$this->_close_channel($client_channel);
}
return true;
}
$elapsed = strtok(microtime(), ' ') + strtok('') - $start;
$this->curTimeout-= $elapsed;
}
$response = $this->_get_binary_packet(true);
if ($response === false) {
$this->bitmap = 0;