159 lines
4.1 KiB
PHP
159 lines
4.1 KiB
PHP
<?php
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/**
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* Pure-PHP ssh-agent client.
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*
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* PHP version 5
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*
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* @category System
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* @package SSH\Agent
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* @author Jim Wigginton <terrafrost@php.net>
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* @copyright 2009 Jim Wigginton
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* @license http://www.opensource.org/licenses/mit-license.html MIT License
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* @link http://phpseclib.sourceforge.net
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* @internal See http://api.libssh.org/rfc/PROTOCOL.agent
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*/
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namespace phpseclib\System\SSH\Agent;
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use phpseclib\System\SSH\Agent;
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/**
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* Pure-PHP ssh-agent client identity object
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*
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* Instantiation should only be performed by \phpseclib\System\SSH\Agent class.
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* This could be thought of as implementing an interface that phpseclib\Crypt\RSA
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* implements. ie. maybe a Net_SSH_Auth_PublicKey interface or something.
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* The methods in this interface would be getPublicKey and sign since those are the
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* methods phpseclib looks for to perform public key authentication.
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*
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* @package SSH\Agent
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* @author Jim Wigginton <terrafrost@php.net>
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* @access internal
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*/
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class Identity
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{
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/**
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* Key Object
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*
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* @var \phpseclib\Crypt\RSA
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* @access private
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* @see self::getPublicKey()
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*/
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var $key;
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/**
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* Key Blob
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*
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* @var string
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* @access private
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* @see self::sign()
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*/
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var $key_blob;
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/**
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* Socket Resource
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*
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* @var resource
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* @access private
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* @see self::sign()
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*/
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var $fsock;
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/**
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* Default Constructor.
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*
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* @param resource $fsock
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* @return \phpseclib\System\SSH\Agent\Identity
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* @access private
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*/
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function __construct($fsock)
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{
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$this->fsock = $fsock;
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}
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/**
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* Set Public Key
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*
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* Called by \phpseclib\System\SSH\Agent::requestIdentities()
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*
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* @param \phpseclib\Crypt\RSA $key
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* @access private
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*/
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function setPublicKey($key)
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{
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$this->key = $key;
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$this->key->setPublicKey();
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}
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/**
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* Set Public Key
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*
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* Called by \phpseclib\System\SSH\Agent::requestIdentities(). The key blob could be extracted from $this->key
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* but this saves a small amount of computation.
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*
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* @param string $key_blob
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* @access private
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*/
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function setPublicKeyBlob($key_blob)
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{
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$this->key_blob = $key_blob;
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}
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/**
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* Get Public Key
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*
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* Wrapper for $this->key->getPublicKey()
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*
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* @param int $format optional
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* @return mixed
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* @access public
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*/
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function getPublicKey($format = null)
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{
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return !isset($format) ? $this->key->getPublicKey() : $this->key->getPublicKey($format);
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}
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/**
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* Set Signature Mode
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*
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* Doesn't do anything as ssh-agent doesn't let you pick and choose the signature mode. ie.
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* ssh-agent's only supported mode is \phpseclib\Crypt\RSA::SIGNATURE_PKCS1
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*
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* @param int $mode
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* @access public
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*/
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function setSignatureMode($mode)
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{
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}
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/**
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* Create a signature
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*
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* See "2.6.2 Protocol 2 private key signature request"
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*
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* @param string $message
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* @return string
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* @access public
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*/
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function sign($message)
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{
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// the last parameter (currently 0) is for flags and ssh-agent only defines one flag (for ssh-dss): SSH_AGENT_OLD_SIGNATURE
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$packet = pack('CNa*Na*N', Agent::SSH_AGENTC_SIGN_REQUEST, strlen($this->key_blob), $this->key_blob, strlen($message), $message, 0);
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$packet = pack('Na*', strlen($packet), $packet);
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if (strlen($packet) != fputs($this->fsock, $packet)) {
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user_error('Connection closed during signing');
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}
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$length = current(unpack('N', fread($this->fsock, 4)));
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$type = ord(fread($this->fsock, 1));
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if ($type != Agent::SSH_AGENT_SIGN_RESPONSE) {
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user_error('Unable to retrieve signature');
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}
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$signature_blob = fread($this->fsock, $length - 1);
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// the only other signature format defined - ssh-dss - is the same length as ssh-rsa
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// the + 12 is for the other various SSH added length fields
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return substr($signature_blob, strlen('ssh-rsa') + 12);
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}
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}
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