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- added limited support for keyboard-interactive authentication (thanks, j31!)

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git-svn-id: http://phpseclib.svn.sourceforge.net/svnroot/phpseclib/trunk@115 21d32557-59b3-4da0-833f-c5933fad653e
This commit is contained in:
Jim Wigginton 2010-08-28 17:26:22 +00:00
parent d9d70f8797
commit d07570b0eb
2 changed files with 115 additions and 7 deletions
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6
phpseclib/Crypt/Hash.php
View File

@ -49,7 +49,7 @@
* @author Jim Wigginton <terrafrost@php.net>
* @copyright MMVII Jim Wigginton
* @license http://www.gnu.org/licenses/lgpl.txt
* @version $Id: Hash.php,v 1.7 2010-08-08 21:29:39 terrafrost Exp $
* @version $Id: Hash.php,v 1.8 2010-08-28 17:26:22 terrafrost Exp $
* @link http://phpseclib.sourceforge.net
*/
@ -406,9 +406,9 @@ class Crypt_Hash {
$l = chr(0);
for ($i = 0; $i < $length; $i+= 16) {
for ($j = 0; $j < 16; $j++) {
// RFC1319 states that C[j] should be set to S[c xor L]
// RFC1319 incorrectly states that C[j] should be set to S[c xor L]
//$c[$j] = chr($s[ord($m[$i + $j] ^ $l)]);
// most implementations, however, set C[j] to S[c xor L] xor C[j]
// per <http://www.rfc-editor.org/errata_search.php?rfc=1319>, however, C[j] should be set to S[c xor L] xor C[j]
$c[$j] = chr($s[ord($m[$i + $j] ^ $l)] ^ ord($c[$j]));
$l = $c[$j];
}

116
phpseclib/Net/SSH2.php
View File

@ -60,7 +60,7 @@
* @author Jim Wigginton <terrafrost@php.net>
* @copyright MMVII Jim Wigginton
* @license http://www.gnu.org/licenses/lgpl.txt
* @version $Id: SSH2.php,v 1.48 2010-05-16 16:10:50 terrafrost Exp $
* @version $Id: SSH2.php,v 1.49 2010-08-28 17:26:22 terrafrost Exp $
* @link http://phpseclib.sourceforge.net
*/
@ -641,7 +641,9 @@ class Net_SSH2 {
$this->terminal_modes,
$this->channel_extended_data_type_codes,
array(60 => 'NET_SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ'),
array(60 => 'NET_SSH2_MSG_USERAUTH_PK_OK')
array(60 => 'NET_SSH2_MSG_USERAUTH_PK_OK'),
array(60 => 'NET_SSH2_MSG_USERAUTH_INFO_REQUEST',
61 => 'NET_SSH2_MSG_USERAUTH_INFO_RESPONSE')
);
$this->fsock = @fsockopen($host, $port, $errno, $errstr, $timeout);
@ -1255,6 +1257,8 @@ class Net_SSH2 {
/**
* Login
*
* The $password parameter can be a plaintext password or a Crypt_RSA object.
*
* @param String $username
* @param optional String $password
* @return Boolean
@ -1330,8 +1334,11 @@ class Net_SSH2 {
$this->errors[] = 'SSH_MSG_USERAUTH_PASSWD_CHANGEREQ: ' . utf8_decode($this->_string_shift($response, $length));
return $this->_disconnect(NET_SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER);
case NET_SSH2_MSG_USERAUTH_FAILURE:
// either the login is bad or the server employees multi-factor authentication
return false;
// can we use keyboard-interactive authentication? if not then either the login is bad or the server employees
// multi-factor authentication
extract(unpack('Nlength', $this->_string_shift($response, 4)));
$auth_methods = explode(',', $this->_string_shift($response, $length));
return in_array('keyboard-interactive', $auth_methods) ? $this->_keyboard_interactive_login($username, $password) : false;
case NET_SSH2_MSG_USERAUTH_SUCCESS:
$this->bitmap |= NET_SSH2_MASK_LOGIN;
return true;
@ -1340,6 +1347,107 @@ class Net_SSH2 {
return false;
}
/**
* Login via keyboard-interactive authentication
*
* See {@link http://tools.ietf.org/html/rfc4256 RFC4256} for details. This is not a full-featured keyboard-interactive authenticator.
*
* @param String $username
* @param String $password
* @return Boolean
* @access private
*/
function _keyboard_interactive_login($username, $password)
{
$packet = pack('CNa*Na*Na*Na*Na*',
NET_SSH2_MSG_USERAUTH_REQUEST, strlen($username), $username, strlen('ssh-connection'), 'ssh-connection',
strlen('keyboard-interactive'), 'keyboard-interactive', 0, '', 0, ''
);
if (!$this->_send_binary_packet($packet)) {
return false;
}
return $this->_keyboard_interactive_process($password);
}
/**
* Handle the keyboard-interactive requests / responses.
*
* @param String $responses...
* @return Boolean
* @access private
*/
function _keyboard_interactive_process()
{
$responses = func_get_args();
$response = $this->_get_binary_packet();
if ($response === false) {
user_error('Connection closed by server', E_USER_NOTICE);
return false;
}
extract(unpack('Ctype', $this->_string_shift($response, 1)));
switch ($type) {
case NET_SSH2_MSG_USERAUTH_INFO_REQUEST:
// see http://tools.ietf.org/html/rfc4256#section-3.2
if (defined('NET_SSH2_LOGGING')) {
$this->message_number_log[count($this->message_number_log) - 1] = 'NET_SSH2_MSG_USERAUTH_INFO_REQUEST';
}
extract(unpack('Nlength', $this->_string_shift($response, 4)));
$this->_string_shift($response, $length); // name; may be empty
extract(unpack('Nlength', $this->_string_shift($response, 4)));
$this->_string_shift($response, $length); // instruction; may be empty
extract(unpack('Nlength', $this->_string_shift($response, 4)));
$this->_string_shift($response, $length); // language tag; may be empty
extract(unpack('Nnum_prompts', $this->_string_shift($response, 4)));
/*
for ($i = 0; $i < $num_prompts; $i++) {
extract(unpack('Nlength', $this->_string_shift($response, 4)));
// prompt - ie. "Password: "; must not be empty
$this->_string_shift($response, $length); // prompt; must not be empty
$echo = $this->_string_shift($response) != chr(0);
}
*/
/*
After obtaining the requested information from the user, the client
MUST respond with an SSH_MSG_USERAUTH_INFO_RESPONSE message.
*/
// see http://tools.ietf.org/html/rfc4256#section-3.4
$packet = pack('CN', NET_SSH2_MSG_USERAUTH_INFO_RESPONSE, count($responses));
for ($i = 0; $i < count($responses); $i++) {
$packet.= pack('Na*', strlen($responses[$i]), $responses[$i]);
}
if (!$this->_send_binary_packet($packet)) {
return false;
}
if (defined('NET_SSH2_LOGGING')) {
$this->message_number_log[count($this->message_number_log) - 1] = 'NET_SSH2_MSG_USERAUTH_INFO_RESPONSE';
}
/*
After receiving the response, the server MUST send either an
SSH_MSG_USERAUTH_SUCCESS, SSH_MSG_USERAUTH_FAILURE, or another
SSH_MSG_USERAUTH_INFO_REQUEST message.
*/
// maybe phpseclib should force close the connection after x request / responses? unless something like that is done
// there could be an infinite loop of request / responses.
return $this->_keyboard_interactive_process();
case NET_SSH2_MSG_USERAUTH_SUCCESS:
return true;
case NET_SSH2_MSG_USERAUTH_FAILURE:
return false;
}
return false;
}
/**
* Login with an RSA private key
*