mod/auth - first stab at zot's magic auth which is going to look a lot like dfrn magic auth (but will zot-guids)

1 files changed, 517 insertions, 0 deletions

diff --git a/mod/auth.php b/mod/auth.php
new file mode 100644
index 000000000..dae8a0e16
--- /dev/null
+++ b/mod/auth.php
@@ -0,0 +1,517 @@
+<?php
+
+
+
+require_once('include/items.php');
+require_once('include/auth.php');
+
+
+function auth_init(&$a) {
+
+
+	$destination_url = ((x($_GET,'destination_url')) ? $_GET['destination_url']      : '');
+	$challenge       = ((x($_GET,'challenge'))       ? $_GET['challenge']            : '');
+	$sec             = ((x($_GET,'sec'))             ? $_GET['sec']                  : '');
+
+	$api_version     = ((x($_GET,'api_version'))    ? (float) $_GET['api_version']   : 1.0);
+
+
+	if(($type === 'profile') && (! strlen($sec))) {
+
+		$sql_extra = '';
+		switch($direction) {
+			case (-1):
+				$sql_extra = sprintf(" AND ( `dfrn_id` = '%s' OR `issued_id` = '%s' ) ", dbesc($dfrn_id),dbesc($dfrn_id));
+				$my_id = $dfrn_id;
+				break;
+			case 0:
+				$sql_extra = sprintf(" AND `issued_id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
+				$my_id = '1:' . $dfrn_id;
+				break;
+			case 1:
+				$sql_extra = sprintf(" AND `dfrn_id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
+				$my_id = '0:' . $dfrn_id;
+				break;
+			default:
+				goaway(z_root());
+				break; // NOTREACHED
+		}
+
+		$r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname` 
+			FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
+			WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0 
+			AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
+			dbesc($a->argv[1])
+		);
+		
+		if(count($r)) {
+
+			$s = fetch_url($r[0]['poll'] . '?dfrn_id=' . $my_id . '&type=profile-check');
+
+			logger("dfrn_poll: old profile returns " . $s, LOGGER_DATA);
+
+			if(strlen($s)) {
+
+				$xml = parse_xml_string($s);
+
+				if((int) $xml->status == 1) {
+					$_SESSION['authenticated'] = 1;
+					if(! x($_SESSION,'remote'))
+						$_SESSION['remote'] = array();
+
+					$_SESSION['remote'][] = array('cid' => $r[0]['id'],'uid' => $r[0]['uid'],'url' => $r[0]['url']);
+
+					$_SESSION['visitor_id'] = $r[0]['id'];
+					$_SESSION['visitor_home'] = $r[0]['url'];
+					$_SESSION['visitor_handle'] = $r[0]['addr'];
+					$_SESSION['visitor_visiting'] = $r[0]['uid'];
+					info( sprintf(t('%s welcomes %s'), $r[0]['username'] , $r[0]['name']) . EOL);
+					// Visitors get 1 day session.
+					$session_id = session_id();
+					$expire = time() + 86400;
+					q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s' LIMIT 1",
+						dbesc($expire),
+						dbesc($session_id)
+					); 
+				}
+			}
+			$profile = $r[0]['nickname'];
+			goaway((strlen($destination_url)) ? $destination_url : $a->get_baseurl() . '/profile/' . $profile);
+		}
+		goaway(z_root());
+
+	}
+
+	if($type === 'profile-check' && $dfrn_version < 2.2 ) {
+
+		if((strlen($challenge)) && (strlen($sec))) {
+
+			q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
+			$r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
+				dbesc($sec)
+			);
+			if(! count($r)) {
+				xml_status(3, 'No ticket');
+				// NOTREACHED
+			}
+			$orig_id = $r[0]['dfrn_id'];
+			if(strpos($orig_id, ':'))
+				$orig_id = substr($orig_id,2);
+
+			$c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
+				intval($r[0]['cid'])
+			);
+			if(! count($c)) {
+				xml_status(3, 'No profile');
+			}
+			$contact = $c[0];
+
+			$sent_dfrn_id = hex2bin($dfrn_id);
+			$challenge    = hex2bin($challenge);
+
+			$final_dfrn_id = '';
+
+			if(($contact['duplex']) && strlen($contact['prvkey'])) {
+				openssl_private_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['prvkey']);
+				openssl_private_decrypt($challenge,$decoded_challenge,$contact['prvkey']);
+			}
+			else {
+				openssl_public_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['pubkey']);
+				openssl_public_decrypt($challenge,$decoded_challenge,$contact['pubkey']);
+			}
+
+			$final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
+
+			if(strpos($final_dfrn_id,':') == 1)
+				$final_dfrn_id = substr($final_dfrn_id,2);
+
+			if($final_dfrn_id != $orig_id) {
+				logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
+				// did not decode properly - cannot trust this site 
+				xml_status(3, 'Bad decryption');
+			}
+
+			header("Content-type: text/xml");
+			echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
+			killme();
+			// NOTREACHED
+		}
+		else {
+				// old protocol
+
+			switch($direction) {
+				case 1:
+					$dfrn_id = '0:' . $dfrn_id;
+					break;
+				case 0:
+					$dfrn_id = '1:' . $dfrn_id;
+					break;
+				default:
+					break;
+			}
+
+
+			q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
+			$r = q("SELECT * FROM `profile_check` WHERE `dfrn_id` = '%s' ORDER BY `expire` DESC",
+				dbesc($dfrn_id));
+			if(count($r)) {
+				xml_status(1);
+				return; // NOTREACHED
+			}
+			xml_status(0);
+			return; // NOTREACHED
+		}
+	}
+
+}
+
+
+
+function auth_post(&$a) {
+
+	$dfrn_id      = ((x($_POST,'dfrn_id'))      ? $_POST['dfrn_id']              : '');
+	$challenge    = ((x($_POST,'challenge'))    ? $_POST['challenge']            : '');
+	$url          = ((x($_POST,'url'))          ? $_POST['url']                  : '');
+	$sec          = ((x($_POST,'sec'))          ? $_POST['sec']                  : '');
+	$ptype        = ((x($_POST,'type'))         ? $_POST['type']                 : '');
+	$api_version = ((x($_POST,'api_version')) ? (float) $_POST['api_version'] : 1.0);
+	$perm         = ((x($_POST,'perm'))         ? $_POST['perm']                 : 'r');
+          
+	if($ptype === 'profile-check') {
+
+		if((strlen($challenge)) && (strlen($sec))) {
+
+			logger('dfrn_poll: POST: profile-check');
+ 
+			q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
+			$r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
+				dbesc($sec)
+			);
+			if(! count($r)) {
+				xml_status(3, 'No ticket');
+				// NOTREACHED
+			}
+			$orig_id = $r[0]['dfrn_id'];
+			if(strpos($orig_id, ':'))
+				$orig_id = substr($orig_id,2);
+
+			$c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
+				intval($r[0]['cid'])
+			);
+			if(! count($c)) {
+				xml_status(3, 'No profile');
+			}
+			$contact = $c[0];
+
+			$sent_dfrn_id = hex2bin($dfrn_id);
+			$challenge    = hex2bin($challenge);
+
+			$final_dfrn_id = '';
+
+			if(($contact['duplex']) && strlen($contact['prvkey'])) {
+				openssl_private_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['prvkey']);
+				openssl_private_decrypt($challenge,$decoded_challenge,$contact['prvkey']);
+			}
+			else {
+				openssl_public_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['pubkey']);
+				openssl_public_decrypt($challenge,$decoded_challenge,$contact['pubkey']);
+			}
+
+			$final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
+
+			if(strpos($final_dfrn_id,':') == 1)
+				$final_dfrn_id = substr($final_dfrn_id,2);
+
+			if($final_dfrn_id != $orig_id) {
+				logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
+				// did not decode properly - cannot trust this site 
+				xml_status(3, 'Bad decryption');
+			}
+
+			header("Content-type: text/xml");
+			echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
+			killme();
+			// NOTREACHED
+		}
+
+	}
+
+	$direction    = (-1);
+	if(strpos($dfrn_id,':') == 1) {
+		$direction = intval(substr($dfrn_id,0,1));
+		$dfrn_id   = substr($dfrn_id,2);
+	}
+
+
+	$r = q("SELECT * FROM `challenge` WHERE `dfrn_id` = '%s' AND `challenge` = '%s' LIMIT 1",
+		dbesc($dfrn_id),
+		dbesc($challenge)
+	);
+
+	if(! count($r))
+		killme();
+
+	$type = $r[0]['type'];
+	$last_update = $r[0]['last_update'];
+
+	$r = q("DELETE FROM `challenge` WHERE `dfrn_id` = '%s' AND `challenge` = '%s' LIMIT 1",
+		dbesc($dfrn_id),
+		dbesc($challenge)
+	);
+
+
+	$sql_extra = '';
+	switch($direction) {
+		case (-1):
+			$sql_extra = sprintf(" AND `issued_id` = '%s' ", dbesc($dfrn_id));
+			$my_id = $dfrn_id;
+			break;
+		case 0:
+			$sql_extra = sprintf(" AND `issued_id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
+			$my_id = '1:' . $dfrn_id;
+			break;
+		case 1:
+			$sql_extra = sprintf(" AND `dfrn_id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
+			$my_id = '0:' . $dfrn_id;
+			break;
+		default:
+			goaway(z_root());
+			break; // NOTREACHED
+	}
+
+
+	$r = q("SELECT * FROM `contact` WHERE `blocked` = 0 AND `pending` = 0 $sql_extra LIMIT 1");
+
+
+	if(! count($r))
+		killme();
+
+	$contact = $r[0];
+	$owner_uid = $r[0]['uid'];
+	$contact_id = $r[0]['id']; 
+
+
+	if($type === 'reputation' && strlen($url)) {
+		$r = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
+			dbesc($url),
+			intval($owner_uid)
+		);
+		$reputation = 0;
+		$text = '';
+
+		if(count($r)) {
+			$reputation = $r[0]['rating'];
+			$text = $r[0]['reason'];
+
+			if($r[0]['id'] == $contact_id) {	// inquiring about own reputation not allowed
+				$reputation = 0;
+				$text = '';
+			}
+		}
+
+		echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
+		<reputation>
+			<url>$url</url>
+			<rating>$reputation</rating>
+			<description>$text</description>
+		</reputation>
+		";
+		killme();
+		// NOTREACHED
+	}
+	else {
+
+		// Update the writable flag if it changed		
+		logger('dfrn_poll: post request feed: ' . print_r($_POST,true),LOGGER_DATA);
+		if($dfrn_version >= 2.21) {
+			if($perm === 'rw')
+				$writable = 1;
+			else
+				$writable = 0;
+
+			if($writable !=  $contact['writable']) {
+				q("UPDATE `contact` SET `writable` = %d WHERE `id` = %d LIMIT 1",
+					intval($writable),
+					intval($contact_id)
+				);
+			}
+		}
+				
+		header("Content-type: application/atom+xml");
+		$o = get_feed_for($a,$dfrn_id, $a->argv[1], $last_update, $direction);
+		echo $o;
+		killme();
+
+	}
+}
+
+function auth_content(&$a) {
+
+	$dfrn_id         = ((x($_GET,'dfrn_id'))         ? $_GET['dfrn_id']              : '');
+	$type            = ((x($_GET,'type'))            ? $_GET['type']                 : 'data');
+	$last_update     = ((x($_GET,'last_update'))     ? $_GET['last_update']          : '');
+	$destination_url = ((x($_GET,'destination_url')) ? $_GET['destination_url']      : '');
+	$sec             = ((x($_GET,'sec'))             ? $_GET['sec']                  : '');
+	$api_version    = ((x($_GET,'api_version'))    ? (float) $_GET['api_version'] : 1.0);
+	$perm            = ((x($_GET,'perm'))            ? $_GET['perm']                 : 'r');
+
+	$direction = (-1);
+	if(strpos($dfrn_id,':') == 1) {
+		$direction = intval(substr($dfrn_id,0,1));
+		$dfrn_id = substr($dfrn_id,2);
+	}
+
+
+	if($dfrn_id != '') {
+		// initial communication from external contact
+		$hash = random_string();
+
+		$status = 0;
+
+		$r = q("DELETE FROM `challenge` WHERE `expire` < " . intval(time()));
+
+		if($type !== 'profile') {
+			$r = q("INSERT INTO `challenge` ( `challenge`, `dfrn_id`, `expire` , `type`, `last_update` )
+				VALUES( '%s', '%s', '%s', '%s', '%s' ) ",
+				dbesc($hash),
+				dbesc($dfrn_id),
+				intval(time() + 60 ),
+				dbesc($type),
+				dbesc($last_update)
+			);
+		}
+		$sql_extra = '';
+		switch($direction) {
+			case (-1):
+				if($type === 'profile')
+					$sql_extra = sprintf(" AND ( `dfrn_id` = '%s' OR `issued_id` = '%s' ) ", dbesc($dfrn_id),dbesc($dfrn_id));
+				else
+					$sql_extra = sprintf(" AND `issued_id` = '%s' ", dbesc($dfrn_id));
+				$my_id = $dfrn_id;
+				break;
+			case 0:
+				$sql_extra = sprintf(" AND `issued_id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
+				$my_id = '1:' . $dfrn_id;
+				break;
+			case 1:
+				$sql_extra = sprintf(" AND `dfrn_id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
+				$my_id = '0:' . $dfrn_id;
+				break;
+			default:
+				goaway(z_root());
+				break; // NOTREACHED
+		}
+
+		$nickname = $a->argv[1];
+
+		$r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname` 
+			FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
+			WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0 
+			AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
+			dbesc($nickname)
+		);
+
+		if(count($r)) {
+
+			$challenge = '';
+			$encrypted_id = '';
+			$id_str = $my_id . '.' . mt_rand(1000,9999);
+
+			if(($r[0]['duplex'] && strlen($r[0]['pubkey'])) || (! strlen($r[0]['prvkey']))) {
+				openssl_public_encrypt($hash,$challenge,$r[0]['pubkey']);
+				openssl_public_encrypt($id_str,$encrypted_id,$r[0]['pubkey']);
+			}
+			else {
+				openssl_private_encrypt($hash,$challenge,$r[0]['prvkey']);
+				openssl_private_encrypt($id_str,$encrypted_id,$r[0]['prvkey']);
+			}
+
+			$challenge = bin2hex($challenge);
+			$encrypted_id = bin2hex($encrypted_id);
+		}
+		else {
+			$status = 1;
+			$challenge = '';
+			$encrypted_id = '';
+		}
+
+		if(strlen($sec)) {
+
+			// URL reply
+
+			$s = post_url($r[0]['poll'], array(
+				'dfrn_id' => $encrypted_id,
+				'type' => 'profile-check',
+				'dfrn_version' => DFRN_PROTOCOL_VERSION,
+				'challenge' => $challenge,
+				'sec' => $sec
+			));
+			
+		$profile = ((count($r) && $r[0]['nickname']) ? $r[0]['nickname'] : $nickname);
+
+		switch($destination_url) {
+			case 'profile':
+				$dest = $a->get_baseurl() . '/profile/' . $profile . '?tab=profile';
+				break;
+			case 'photos':
+				$dest = $a->get_baseurl() . '/photos/' . $profile;
+				break;
+			case 'status':
+			case '':
+				$dest = $a->get_baseurl() . '/profile/' . $profile;
+				break;		
+			default:
+				$dest = $destination_url;
+				break;
+		}
+
+		logger("mod-auth: sec profile: " . $s, LOGGER_DATA);
+
+		if(strlen($s)) {
+
+			$j = json_decode($s);
+
+			logger('mod-auth: profile: parsed json: ' . print_r($j,true), LOGGER_DATA);
+			logger('mod-auth: secure profile: challenge: ' . $j->challenge . ' expecting ' . $hash);
+			logger('mod-auth: secure profile: sec: ' . $j->sec . ' expecting ' . $sec);
+ 
+				
+			if(((int) $j->status == 0) && ($j->challenge == $hash)  && ($j->sec == $sec)) {
+				$_SESSION['authenticated'] = 1;
+				if(! x($_SESSION,'remote'))
+					$_SESSION['remote'] = array();
+				$_SESSION['remote'][] = array('cid' => $r[0]['id'],'uid' => $r[0]['uid'],'url' => $r[0]['url']);
+				$_SESSION['visitor_id'] = $r[0]['id'];
+				$_SESSION['visitor_home'] = $r[0]['url'];
+				$_SESSION['visitor_visiting'] = $r[0]['uid'];
+				info( sprintf(t('%s welcomes %s'), $r[0]['username'] , $r[0]['name']) . EOL);
+				// Visitors get 1 day session.
+				$session_id = session_id();
+				$expire = time() + 86400;
+				q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s' LIMIT 1",
+					dbesc($expire),
+					dbesc($session_id)
+				); 
+			}
+			
+			goaway($dest);
+			// NOTREACHED
+
+		}
+		else {
+			// XML reply
+			header("Content-type: text/xml");
+			echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n"
+				. '<dfrn_poll>' . "\r\n"
+				. "\t" . '<status>' . $status . '</status>' . "\r\n"
+				. "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n"
+				. "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n"
+				. "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n"
+				. '</dfrn_poll>' . "\r\n" ;
+			killme();
+			// NOTREACHED
+		}
+	}
+}
+}
+