92 lines
2.9 KiB
PHP
92 lines
2.9 KiB
PHP
<?php
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/**
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* @file src/Module/Owa.php
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*/
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namespace Friendica\Module;
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use Friendica\BaseModule;
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use Friendica\Core\Logger;
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use Friendica\Core\System;
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use Friendica\Database\DBA;
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use Friendica\Model\Contact;
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use Friendica\Model\OpenWebAuthToken;
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use Friendica\Util\HTTPSignature;
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use Friendica\Util\Strings;
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/**
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* @brief OpenWebAuth verifier and token generator
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*
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* See https://macgirvin.com/wiki/mike/OpenWebAuth/Home
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* Requests to this endpoint should be signed using HTTP Signatures
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* using the 'Authorization: Signature' authentication method
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* If the signature verifies a token is returned.
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*
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* This token may be exchanged for an authenticated cookie.
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*
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* Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/Zotlabs/Module/Owa.php
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*/
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class Owa extends BaseModule
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{
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public static function init()
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{
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$ret = [ 'success' => false ];
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foreach (['REDIRECT_REMOTE_USER', 'HTTP_AUTHORIZATION'] as $head) {
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if (array_key_exists($head, $_SERVER) && substr(trim($_SERVER[$head]), 0, 9) === 'Signature') {
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if ($head !== 'HTTP_AUTHORIZATION') {
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$_SERVER['HTTP_AUTHORIZATION'] = $_SERVER[$head];
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continue;
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}
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$sigblock = HTTPSignature::parseSigheader($_SERVER[$head]);
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if ($sigblock) {
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$keyId = $sigblock['keyId'];
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if ($keyId) {
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// Try to find the public contact entry of the handle.
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$handle = str_replace('acct:', '', $keyId);
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$cid = Contact::getIdForURL($handle);
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$fields = ['id', 'url', 'addr', 'pubkey'];
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$condition = ['id' => $cid];
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$contact = DBA::selectFirst('contact', $fields, $condition);
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if (DBA::isResult($contact)) {
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// Try to verify the signed header with the public key of the contact record
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// we have found.
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$verified = HTTPSignature::verifyMagic($contact['pubkey']);
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if ($verified && $verified['header_signed'] && $verified['header_valid']) {
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Logger::log('OWA header: ' . print_r($verified, true), Logger::DATA);
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Logger::log('OWA success: ' . $contact['addr'], Logger::DATA);
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$ret['success'] = true;
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$token = Strings::getRandomHex(32);
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// Store the generated token in the databe.
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OpenWebAuthToken::create('owt', 0, $token, $contact['addr']);
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$result = '';
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// Encrypt the token with the public contacts publik key.
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// Only the specific public contact will be able to encrypt it.
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// At a later time, we will compare weather the token we're getting
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// is really the same token we have stored in the database.
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openssl_public_encrypt($token, $result, $contact['pubkey']);
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$ret['encrypted_token'] = Strings::base64UrlEncode($result);
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} else {
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Logger::log('OWA fail: ' . $contact['id'] . ' ' . $contact['addr'] . ' ' . $contact['url'], Logger::DEBUG);
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}
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} else {
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Logger::log('Contact not found: ' . $handle, Logger::DEBUG);
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}
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}
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}
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}
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}
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System::jsonExit($ret, 'application/x-zot+json');
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}
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}
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