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<?php /** * Pure-PHP ssh-agent client. * * PHP versions 4 and 5 * * Here are some examples of how to use this library: * <code> * <?php * include 'System/SSH/Agent.php'; * include 'Net/SSH2.php'; * * $agent = new System_SSH_Agent(); * * $ssh = new Net_SSH2('www.domain.tld'); * if (!$ssh->login('username', $agent)) { * exit('Login Failed'); * } * * echo $ssh->exec('pwd'); * echo $ssh->exec('ls -la'); * ?> * </code> * * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. * * @category System * @package System_SSH_Agent * @author Jim Wigginton <terrafrost@php.net> * @copyright 2014 Jim Wigginton * @license http://www.opensource.org/licenses/mit-license.html MIT License * @link http://phpseclib.sourceforge.net * @internal See http://api.libssh.org/rfc/PROTOCOL.agent */
/**#@+ * Message numbers * * @access private */ // to request SSH1 keys you have to use SSH_AGENTC_REQUEST_RSA_IDENTITIES (1) define('SYSTEM_SSH_AGENTC_REQUEST_IDENTITIES', 11); // this is the SSH2 response; the SSH1 response is SSH_AGENT_RSA_IDENTITIES_ANSWER (2). define('SYSTEM_SSH_AGENT_IDENTITIES_ANSWER', 12); define('SYSTEM_SSH_AGENT_FAILURE', 5); // the SSH1 request is SSH_AGENTC_RSA_CHALLENGE (3) define('SYSTEM_SSH_AGENTC_SIGN_REQUEST', 13); // the SSH1 response is SSH_AGENT_RSA_RESPONSE (4) define('SYSTEM_SSH_AGENT_SIGN_RESPONSE', 14); /**#@-*/
/** * Pure-PHP ssh-agent client identity object * * Instantiation should only be performed by System_SSH_Agent class. * This could be thought of as implementing an interface that Crypt_RSA * implements. ie. maybe a Net_SSH_Auth_PublicKey interface or something. * The methods in this interface would be getPublicKey, setSignatureMode * and sign since those are the methods phpseclib looks for to perform * public key authentication. * * @package System_SSH_Agent * @author Jim Wigginton <terrafrost@php.net> * @access internal */ class System_SSH_Agent_Identity { /** * Key Object * * @var Crypt_RSA * @access private * @see System_SSH_Agent_Identity::getPublicKey() */ var $key;
/** * Key Blob * * @var String * @access private * @see System_SSH_Agent_Identity::sign() */ var $key_blob;
/** * Socket Resource * * @var Resource * @access private * @see System_SSH_Agent_Identity::sign() */ var $fsock;
/** * Default Constructor. * * @param Resource $fsock * @return System_SSH_Agent_Identity * @access private */ function System_SSH_Agent_Identity($fsock) { $this->fsock = $fsock; }
/** * Set Public Key * * Called by System_SSH_Agent::requestIdentities() * * @param Crypt_RSA $key * @access private */ function setPublicKey($key) { $this->key = $key; $this->key->setPublicKey(); }
/** * Set Public Key * * Called by System_SSH_Agent::requestIdentities(). The key blob could be extracted from $this->key * but this saves a small amount of computation. * * @param String $key_blob * @access private */ function setPublicKeyBlob($key_blob) { $this->key_blob = $key_blob; }
/** * Get Public Key * * Wrapper for $this->key->getPublicKey() * * @param Integer $format optional * @return Mixed * @access public */ function getPublicKey($format = null) { return !isset($format) ? $this->key->getPublicKey() : $this->key->getPublicKey($format); }
/** * Set Signature Mode * * Doesn't do anything as ssh-agent doesn't let you pick and choose the signature mode. ie. * ssh-agent's only supported mode is CRYPT_RSA_SIGNATURE_PKCS1 * * @param Integer $mode * @access public */ function setSignatureMode($mode) { }
/** * Create a signature * * See "2.6.2 Protocol 2 private key signature request" * * @param String $message * @return String * @access public */ function sign($message) { // the last parameter (currently 0) is for flags and ssh-agent only defines one flag (for ssh-dss): SSH_AGENT_OLD_SIGNATURE $packet = pack('CNa*Na*N', SYSTEM_SSH_AGENTC_SIGN_REQUEST, strlen($this->key_blob), $this->key_blob, strlen($message), $message, 0); $packet = pack('Na*', strlen($packet), $packet); if (strlen($packet) != fputs($this->fsock, $packet)) { user_error('Connection closed during signing'); }
$length = current(unpack('N', fread($this->fsock, 4))); $type = ord(fread($this->fsock, 1)); if ($type != SYSTEM_SSH_AGENT_SIGN_RESPONSE) { user_error('Unable to retreive signature'); }
$signature_blob = fread($this->fsock, $length - 1); // the only other signature format defined - ssh-dss - is the same length as ssh-rsa // the + 12 is for the other various SSH added length fields return substr($signature_blob, strlen('ssh-rsa') + 12); } }
/** * Pure-PHP ssh-agent client identity factory * * requestIdentities() method pumps out System_SSH_Agent_Identity objects * * @package System_SSH_Agent * @author Jim Wigginton <terrafrost@php.net> * @access internal */ class System_SSH_Agent { /** * Socket Resource * * @var Resource * @access private */ var $fsock;
/** * Default Constructor * * @return System_SSH_Agent * @access public */ function System_SSH_Agent() { switch (true) { case isset($_SERVER['SSH_AUTH_SOCK']): $address = $_SERVER['SSH_AUTH_SOCK']; break; case isset($_ENV['SSH_AUTH_SOCK']): $address = $_ENV['SSH_AUTH_SOCK']; break; default: user_error('SSH_AUTH_SOCK not found'); return false; }
$this->fsock = fsockopen('unix://' . $address, 0, $errno, $errstr); if (!$this->fsock) { user_error("Unable to connect to ssh-agent (Error $errno: $errstr)"); } }
/** * Request Identities * * See "2.5.2 Requesting a list of protocol 2 keys" * Returns an array containing zero or more System_SSH_Agent_Identity objects * * @return Array * @access public */ function requestIdentities() { if (!$this->fsock) { return array(); }
$packet = pack('NC', 1, SYSTEM_SSH_AGENTC_REQUEST_IDENTITIES); if (strlen($packet) != fputs($this->fsock, $packet)) { user_error('Connection closed while requesting identities'); }
$length = current(unpack('N', fread($this->fsock, 4))); $type = ord(fread($this->fsock, 1)); if ($type != SYSTEM_SSH_AGENT_IDENTITIES_ANSWER) { user_error('Unable to request identities'); }
$identities = array(); $keyCount = current(unpack('N', fread($this->fsock, 4))); for ($i = 0; $i < $keyCount; $i++) { $length = current(unpack('N', fread($this->fsock, 4))); $key_blob = fread($this->fsock, $length); $length = current(unpack('N', fread($this->fsock, 4))); $key_comment = fread($this->fsock, $length); $length = current(unpack('N', substr($key_blob, 0, 4))); $key_type = substr($key_blob, 4, $length); switch ($key_type) { case 'ssh-rsa': if (!class_exists('Crypt_RSA')) { include_once 'Crypt/RSA.php'; } $key = new Crypt_RSA(); $key->loadKey('ssh-rsa ' . base64_encode($key_blob) . ' ' . $key_comment); break; case 'ssh-dss': // not currently supported break; } // resources are passed by reference by default if (isset($key)) { $identity = new System_SSH_Agent_Identity($this->fsock); $identity->setPublicKey($key); $identity->setPublicKeyBlob($key_blob); $identities[] = $identity; unset($key); } }
return $identities; } }
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