port hubzillas OpenWebAuth - remote authentification

src/Module/Magic.php

@@ -0,0 +1,121 @@
+<?php
+/**
+ * @file src/Module/Magic.php
+ */
+namespace Friendica\Module;
+
+use Friendica\BaseModule;
+use Friendica\Database\DBM;
+use Friendica\Network\Probe;
+use Friendica\Util\HTTPSig;
+use Friendica\Util\Network;
+
+use dba;
+
+class Magic extends BaseModule
+{
+	public static function init()
+	{
+		$a = self::getApp();
+		$ret = ['success' => false, 'url' => '', 'message' => ''];
+		logger('magic mdule: invoked', LOGGER_DEBUG);
+
+		logger('args: ' . print_r($_REQUEST, true), LOGGER_DATA);
+
+		$addr = ((x($_REQUEST, 'addr')) ? $_REQUEST['addr'] : '');
+		$dest = ((x($_REQUEST, 'dest')) ? $_REQUEST['dest'] : '');
+		$test = ((x($_REQUEST, 'test')) ? intval($_REQUEST['test']) : 0);
+		$owa  = ((x($_REQUEST, 'owa'))  ? intval($_REQUEST['owa'])  : 0);
+
+		// NOTE: I guess $dest isn't just the profile url (could be also 
+		// other profile pages e.g. photo). We need to find a solution
+		// to be able to redirct to other pages than the contact profile.
+		$fields = ["id", "nurl", "url"];
+		$condition = ["nurl" => normalise_link($dest)];
+
+		$contact = dba::selectFirst("contact", $fields, $condition);
+
+		if (!DBM::is_result($contact)) {
+			// If we don't have a contact record, try to probe it.
+			/// @todo: Also check against the $addr.
+			Probe::uri($dest, '', -1, true, true);
+			$contact = dba::selectFirst("contact", $fields, $condition);
+		}
+
+		if (!DBM::is_result($contact)) {
+			logger("No contact record found: " . print_r($_REQUEST, true), LOGGER_DEBUG);
+			goaway($dest);
+		}
+
+		// Redirect if the contact is already authenticated on this site.
+		if (array_key_exists("id", $a->contact) && strpos($contact['nurl'], normalise_link(self::getApp()->get_baseurl())) !== false) {
+			if($test) {
+				$ret['success'] = true;
+				$ret['message'] .= 'Local site - you are already authenticated.' . EOL;
+				return $ret;
+			}
+
+			logger("Contact is already authenticated", LOGGER_DEBUG);
+			goaway($dest);
+		}
+
+		if (local_user()) {
+			$user = $a->user;
+
+			// OpenWebAuth
+			if ($owa) {
+				// Extract the basepath
+				// NOTE: we need another solution because this does only work
+				// for friendica contacts :-/ . We should have the basepath
+				// of a contact also in the contact table.
+				$exp = explode("/profile/", $contact['url']);
+				$basepath = $exp[0];
+
+				$headers = [];
+				$headers['Accept'] = 'application/x-dfrn+json';
+				$headers['X-Open-Web-Auth'] = random_string();
+
+				// Create a header that is signed with the local users private key.
+				$headers = HTTPSig::createSig(
+							'',
+							$headers,
+							$user['prvkey'],
+							'acct:' . $user['nickname'] . '@' . $a->get_hostname() . ($a->path ? '/' . $a->path : ''),
+							false,
+							true,
+							'sha512'
+				);
+
+				// Try to get an authentication token from the other instance.
+				$x = Network::curl($basepath . '/owa', false, $redirects, ['headers' => $headers]);
+
+				if ($x['success']) {
+					$j = json_decode($x['body'], true);
+
+					if ($j['success']) {
+						$token = '';
+						if ($j['encrypted_token']) {
+							// The token is encrypted. If the local user is really the one the other instance
+							// thinks he/she is, the token can be decrypted with the local users public key.
+							openssl_private_decrypt(base64url_decode($j['encrypted_token']), $token, $user['prvkey']);
+						} else {
+							$token = $j['token'];
+						}
+						$x = strpbrk($dest, '?&');
+						$args = (($x) ? '&owt=' . $token : '?f=&owt=' . $token);
+
+						goaway($dest . $args);
+					}
+				}
+				goaway($dest);
+			}
+		}
+
+		if($test) {
+			$ret['message'] = 'Not authenticated or invalid arguments' . EOL;
+			return $ret;
+		}
+
+		goaway($dest);
+	}
+}

src/Module/Owa.php

@@ -0,0 +1,94 @@
+<?php
+/**
+ * @file src/Module/Owa.php
+ */
+namespace Friendica\Module;
+
+use Friendica\BaseModule;
+use Friendica\Core\System;
+use Friendica\Database\DBM;
+use Friendica\Model\Verify;
+use Friendica\Network\Probe;
+use Friendica\Util\DateTimeFormat;
+use Friendica\Util\HTTPSig;
+
+use dba;
+
+/**
+ * @brief OpenWebAuth verifier and token generator
+ * 
+ * See https://macgirvin.com/wiki/mike/OpenWebAuth/Home
+ * Requests to this endpoint should be signed using HTTP Signatures
+ * using the 'Authorization: Signature' authentication method
+ * If the signature verifies a token is returned.
+ *
+ * This token may be exchanged for an authenticated cookie.
+ */
+class Owa extends BaseModule
+{
+	public static function init()
+	{
+
+		$ret = [ 'success' => false ];
+
+		foreach (['REDIRECT_REMOTE_USER', 'HTTP_AUTHORIZATION'] as $head) {
+			if (array_key_exists($head, $_SERVER) && substr(trim($_SERVER[$head]), 0, 9) === 'Signature') {
+				if ($head !== 'HTTP_AUTHORIZATION') {
+					$_SERVER['HTTP_AUTHORIZATION'] = $_SERVER[$head];
+					continue;
+				}
+
+				$sigblock = HTTPSig::parseSigheader($_SERVER[$head]);
+				if ($sigblock) {
+					$keyId = $sigblock['keyId'];
+
+					if ($keyId) {
+						// Try to find the public contact entry of the handle.
+						$handle = str_replace("acct:", "", $keyId);
+						$fields = ["id", "url", "addr", "pubkey"];
+						$condition = ["addr" => $handle, "uid" => 0];
+
+						$contact = dba::selectFirst("contact", $fields, $condition);
+
+						// Not found? Try to probe with the handle.
+						if(!DBM::is_result($contact)) {
+							Probe::uri($handle, '', -1, true, true);
+							$contact = dba::selectFirst("contact", $fields, $condition);
+						}
+
+						if (DBM::is_result($contact)) {
+							// Try to verify the signed header with the public key of the contact record
+							// we have found.
+							$verified = HTTPSig::verify('', $contact['pubkey']);
+
+							if ($verified && $verified['header_signed'] && $verified['header_valid']) {
+								logger('OWA header: ' . print_r($verified, true), LOGGER_DATA);
+								logger('OWA success: ' . $contact['addr'], LOGGER_DATA);
+
+								$ret['success'] = true;
+								$token = random_string(32);
+
+								// Store the generated token in the databe.
+								Verify::create('owt', 0, $token, $contact['addr']);
+
+								$result = '';
+
+								// Encrypt the token with the public contacts publik key.
+								// Only the specific public contact will be able to encrypt it.
+								// At a later time, we will compare weather the token we're getting
+								// is really the same token we have stored in the database.
+								openssl_public_encrypt($token, $result, $contact['pubkey']);
+								$ret['encrypted_token'] = base64url_encode($result);
+							} else {
+								logger('OWA fail: ' . $contact['id'] . ' ' . $contact['addr'] . ' ' . $contact['url'], LOGGER_DEBUG);
+							}
+						} else {
+							logger('Contact not found: ' . $handle, LOGGER_DEBUG);
+						}
+					}
+				}
+			}
+		}
+		System::jsonExit($ret, 'application/x-dfrn+json');
+	}
+}