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cvm/frontend/classes/class.sshconnector.php

125 lines
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<?php
/*
* CVM is more free software. It is licensed under the WTFPL, which
* allows you to do pretty much anything with it, without having to
* ask permission. Commercial use is allowed, and no attribution is
* required. We do politely request that you share your modifications
* to benefit other developers, but you are under no enforced
* obligation to do so :)
*
* Please read the accompanying LICENSE document for the full WTFPL
* licensing text.
*/
if(!isset($_CVM)) { die("Unauthorized."); }
class SshConnector extends CPHPBaseClass
{
public $connected = false;
public $authenticated = false;
public $connection = null;
public $host = "localhost";
public $port = 22;
public $user = "root";
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public $key = "";
public $pubkey = "";
public $keytype = "ssh-rsa";
public $helper = "~/runhelper";
private $cache = "";
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public function RunCommand($command, $throw_exception = false)
{
try
{
if($this->connected == false && $this->authenticated == false)
{
$this->Connect();
}
return $this->DoCommand($command, $throw_exception);
}
catch (SshConnectException $e)
{
$error = $e->getMessage();
throw new SshCommandException("Could not run command {$command}: Failed to connect: {$error}");
}
}
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public function RunCommandCached($command, $throw_exception = false)
{
if(!isset($this->cache[$command]))
{
$result = $this->RunCommand($command, $throw_exception);
$this->cache[$command] = $result;
return $result;
}
else
{
return $this->cache[$command];
}
}
public function Connect()
{
$options = array(
'hostkey' => $this->keytype
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);
if($this->connection = ssh2_connect($this->host, $this->port, $options))
{
$this->connected = true;
if(empty($this->passphrase))
{
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$result = ssh2_auth_pubkey_file($this->connection, $this->user, $this->pubkey, $this->key);
}
else
{
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$result = ssh2_auth_pubkey_file($this->connection, $this->user, $this->pubkey, $this->key, $this->passphrase);
}
if($result === true)
{
$this->authenticated = true;
return true;
}
else
{
throw new SshAuthException("Could not connect to {$this->host}:{$this->port}: Key authentication failed");
}
}
else
{
throw new SshConnectException("Could not connect to {$this->host}:{$this->port}: {$error}");
}
return false;
}
private function DoCommand($command, $throw_exception)
{
$command = escapeshellarg($command);
$command = "{$this->helper} {$command}";
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$stream = ssh2_exec($this->connection, $command);
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stream_set_blocking($stream, true);
$returndata = json_decode(stream_get_contents($stream));
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$returndata->stderr = trim($returndata->stderr);
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fclose($stream);
if($returndata->returncode != 0 && $throw_exception === true)
{
throw new SshExitException("Non-zero exit code returned: {$returndata->stderr}", $returndata->returncode);
}
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return $returndata;
}
}
?>