<?php /** * @file mod/dfrn_request.php * @brief Module: dfrn_request * * Purpose: Handles communication associated with the issuance of * friend requests. * * @see PDF with dfrn specs: https://github.com/friendica/friendica/blob/master/spec/dfrn2.pdf * You also find a graphic which describes the confirmation process at * https://github.com/friendica/friendica/blob/master/spec/dfrn2_contact_request.png */ use Friendica\App; use Friendica\Core\Config; use Friendica\Core\PConfig; use Friendica\Core\System; use Friendica\Database\DBM; use Friendica\Model\Contact; use Friendica\Model\Group; use Friendica\Model\User; use Friendica\Module\Login; use Friendica\Network\Probe; require_once 'include/enotify.php'; function dfrn_request_init(App $a) { if ($a->argc > 1) $which = $a->argv[1]; profile_load($a, $which); return; } /** * Function: dfrn_request_post * * Purpose: * Handles multiple scenarios. * * Scenario 1: * Clicking 'submit' on a friend request page. * * Scenario 2: * Following Scenario 1, we are brought back to our home site * in order to link our friend request with our own server cell. * After logging in, we click 'submit' to approve the linkage. * */ function dfrn_request_post(App $a) { if (($a->argc != 2) || (!count($a->profile))) { logger('Wrong count of argc or profiles: argc=' . $a->argc . ',profile()=' . count($a->profile)); return; } if (x($_POST, 'cancel')) { goaway(System::baseUrl()); } /* * Scenario 2: We've introduced ourself to another cell, then have been returned to our own cell * to confirm the request, and then we've clicked submit (perhaps after logging in). * That brings us here: */ if ((x($_POST, 'localconfirm')) && ($_POST['localconfirm'] == 1)) { // Ensure this is a valid request if (local_user() && ($a->user['nickname'] == $a->argv[1]) && (x($_POST, 'dfrn_url'))) { $dfrn_url = notags(trim($_POST['dfrn_url'])); $aes_allow = (((x($_POST, 'aes_allow')) && ($_POST['aes_allow'] == 1)) ? 1 : 0); $confirm_key = ((x($_POST, 'confirm_key')) ? $_POST['confirm_key'] : ""); $hidden = ((x($_POST, 'hidden-contact')) ? intval($_POST['hidden-contact']) : 0); $contact_record = null; $blocked = 1; $pending = 1; if (x($dfrn_url)) { // Lookup the contact based on their URL (which is the only unique thing we have at the moment) $r = q("SELECT * FROM `contact` WHERE `uid` = %d AND `nurl` = '%s' AND NOT `self` LIMIT 1", intval(local_user()), dbesc(normalise_link($dfrn_url)) ); if (DBM::is_result($r)) { if (strlen($r[0]['dfrn-id'])) { // We don't need to be here. It has already happened. notice(t("This introduction has already been accepted.") . EOL); return; } else { $contact_record = $r[0]; } } if (is_array($contact_record)) { $r = q("UPDATE `contact` SET `ret-aes` = %d, hidden = %d WHERE `id` = %d", intval($aes_allow), intval($hidden), intval($contact_record['id']) ); } else { // Scrape the other site's profile page to pick up the dfrn links, key, fn, and photo $parms = Probe::profile($dfrn_url); if (!count($parms)) { notice(t('Profile location is not valid or does not contain profile information.') . EOL); return; } else { if (!x($parms, 'fn')) { notice(t('Warning: profile location has no identifiable owner name.') . EOL); } if (!x($parms, 'photo')) { notice(t('Warning: profile location has no profile photo.') . EOL); } $invalid = Probe::validDfrn($parms); if ($invalid) { notice(sprintf(tt("%d required parameter was not found at the given location", "%d required parameters were not found at the given location", $invalid), $invalid) . EOL); return; } } $dfrn_request = $parms['dfrn-request']; $photo = $parms["photo"]; // Escape the entire array DBM::esc_array($parms); // Create a contact record on our site for the other person $r = q("INSERT INTO `contact` ( `uid`, `created`,`url`, `nurl`, `addr`, `name`, `nick`, `photo`, `site-pubkey`, `request`, `confirm`, `notify`, `poll`, `poco`, `network`, `aes_allow`, `hidden`, `blocked`, `pending`) VALUES ( %d, '%s', '%s', '%s', '%s', '%s' , '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', %d, %d, %d, %d)", intval(local_user()), datetime_convert(), dbesc($dfrn_url), dbesc(normalise_link($dfrn_url)), $parms['addr'], $parms['fn'], $parms['nick'], $parms['photo'], $parms['key'], $parms['dfrn-request'], $parms['dfrn-confirm'], $parms['dfrn-notify'], $parms['dfrn-poll'], $parms['dfrn-poco'], dbesc(NETWORK_DFRN), intval($aes_allow), intval($hidden), intval($blocked), intval($pending) ); } if ($r) { info(t("Introduction complete.") . EOL); } $r = q("SELECT `id`, `network` FROM `contact` WHERE `uid` = %d AND `url` = '%s' AND `site-pubkey` = '%s' LIMIT 1", intval(local_user()), dbesc($dfrn_url), $parms['key'] // this was already escaped ); if (DBM::is_result($r)) { Group::addMember(User::getDefaultGroup($uid, $r[0]["network"]), $r[0]['id']); if (isset($photo)) { Contact::updateAvatar($photo, local_user(), $r[0]["id"], true); } $forwardurl = System::baseUrl() . "/contacts/" . $r[0]['id']; } else { $forwardurl = System::baseUrl() . "/contacts"; } // Allow the blocked remote notification to complete if (is_array($contact_record)) { $dfrn_request = $contact_record['request']; } if (strlen($dfrn_request) && strlen($confirm_key)) { $s = fetch_url($dfrn_request . '?confirm_key=' . $confirm_key); } // (ignore reply, nothing we can do it failed) // Old: goaway(zrl($dfrn_url)); goaway($forwardurl); return; // NOTREACHED } } // invalid/bogus request notice(t('Unrecoverable protocol error.') . EOL); goaway(System::baseUrl()); return; // NOTREACHED } /* * Otherwise: * * Scenario 1: * We are the requestee. A person from a remote cell has made an introduction * on our profile web page and clicked submit. We will use their DFRN-URL to * figure out how to contact their cell. * * Scrape the originating DFRN-URL for everything we need. Create a contact record * and an introduction to show our user next time he/she logs in. * Finally redirect back to the requestor so that their site can record the request. * If our user (the requestee) later confirms this request, a record of it will need * to exist on the requestor's cell in order for the confirmation process to complete.. * * It's possible that neither the requestor or the requestee are logged in at the moment, * and the requestor does not yet have any credentials to the requestee profile. * * Who is the requestee? We've already loaded their profile which means their nickname should be * in $a->argv[1] and we should have their complete info in $a->profile. * */ if (!(is_array($a->profile) && count($a->profile))) { notice(t('Profile unavailable.') . EOL); return; } $nickname = $a->profile['nickname']; $notify_flags = $a->profile['notify-flags']; $uid = $a->profile['uid']; $maxreq = intval($a->profile['maxreq']); $contact_record = null; $failed = false; $parms = null; $blocked = 1; $pending = 1; if (x($_POST, 'dfrn_url')) { // Block friend request spam if ($maxreq) { $r = q("SELECT * FROM `intro` WHERE `datetime` > '%s' AND `uid` = %d", dbesc(datetime_convert('UTC', 'UTC', 'now - 24 hours')), intval($uid) ); if (DBM::is_result($r) && count($r) > $maxreq) { notice(sprintf(t('%s has received too many connection requests today.'), $a->profile['name']) . EOL); notice(t('Spam protection measures have been invoked.') . EOL); notice(t('Friends are advised to please try again in 24 hours.') . EOL); return; } } /* Cleanup old introductions that remain blocked. * Also remove the contact record, but only if there is no existing relationship */ $r = q("SELECT `intro`.*, `intro`.`id` AS `iid`, `contact`.`id` AS `cid`, `contact`.`rel` FROM `intro` LEFT JOIN `contact` on `intro`.`contact-id` = `contact`.`id` WHERE `intro`.`blocked` = 1 AND `contact`.`self` = 0 AND `intro`.`datetime` < UTC_TIMESTAMP() - INTERVAL 30 MINUTE " ); if (DBM::is_result($r)) { foreach ($r as $rr) { if (!$rr['rel']) { q("DELETE FROM `contact` WHERE `id` = %d AND NOT `self`", intval($rr['cid']) ); } q("DELETE FROM `intro` WHERE `id` = %d", intval($rr['iid']) ); } } $real_name = x($_POST, 'realname') ? notags(trim($_POST['realname'])) : ''; $url = trim($_POST['dfrn_url']); if (!strlen($url)) { notice(t("Invalid locator") . EOL); return; } $hcard = ''; // Detect the network $data = Probe::uri($url); $network = $data["network"]; // Canonicalise email-style profile locator $url = Probe::webfingerDfrn($url, $hcard); if (substr($url, 0, 5) === 'stat:') { // Every time we detect the remote subscription we define this as OStatus. // We do this even if it is not OStatus. // we only need to pass this through another section of the code. if ($network != NETWORK_DIASPORA) { $network = NETWORK_OSTATUS; } $url = substr($url, 5); } else { $network = NETWORK_DFRN; } logger('dfrn_request: url: ' . $url . ',network=' . $network, LOGGER_DEBUG); if ($network === NETWORK_DFRN) { $ret = q("SELECT * FROM `contact` WHERE `uid` = %d AND `url` = '%s' AND `self` = 0 LIMIT 1", intval($uid), dbesc($url) ); if (DBM::is_result($ret)) { if (strlen($ret[0]['issued-id'])) { notice(t('You have already introduced yourself here.') . EOL); return; } elseif ($ret[0]['rel'] == CONTACT_IS_FRIEND) { notice(sprintf(t('Apparently you are already friends with %s.'), $a->profile['name']) . EOL); return; } else { $contact_record = $ret[0]; $parms = array('dfrn-request' => $ret[0]['request']); } } $issued_id = random_string(); if (is_array($contact_record)) { // There is a contact record but no issued-id, so this // is a reciprocal introduction from a known contact $r = q("UPDATE `contact` SET `issued-id` = '%s' WHERE `id` = %d", dbesc($issued_id), intval($contact_record['id']) ); } else { $url = validate_url($url); if (!$url) { notice(t('Invalid profile URL.') . EOL); goaway(System::baseUrl() . '/' . $a->cmd); return; // NOTREACHED } if (!allowed_url($url)) { notice(t('Disallowed profile URL.') . EOL); goaway(System::baseUrl() . '/' . $a->cmd); return; // NOTREACHED } if (blocked_url($url)) { notice(t('Blocked domain') . EOL); goaway(System::baseUrl() . '/' . $a->cmd); return; // NOTREACHED } $parms = Probe::profile(($hcard) ? $hcard : $url); if (!count($parms)) { notice(t('Profile location is not valid or does not contain profile information.') . EOL); goaway(System::baseUrl() . '/' . $a->cmd); } else { if (!x($parms, 'fn')) { notice(t('Warning: profile location has no identifiable owner name.') . EOL); } if (!x($parms, 'photo')) { notice(t('Warning: profile location has no profile photo.') . EOL); } $invalid = Probe::validDfrn($parms); if ($invalid) { notice(sprintf(tt("%d required parameter was not found at the given location", "%d required parameters were not found at the given location", $invalid), $invalid) . EOL); return; } } $parms['url'] = $url; $parms['issued-id'] = $issued_id; $photo = $parms["photo"]; DBM::esc_array($parms); $r = q("INSERT INTO `contact` ( `uid`, `created`, `url`, `nurl`, `addr`, `name`, `nick`, `issued-id`, `photo`, `site-pubkey`, `request`, `confirm`, `notify`, `poll`, `poco`, `network`, `blocked`, `pending` ) VALUES ( %d, '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', %d, %d )", intval($uid), dbesc(datetime_convert()), $parms['url'], dbesc(normalise_link($url)), $parms['addr'], $parms['fn'], $parms['nick'], $parms['issued-id'], $parms['photo'], $parms['key'], $parms['dfrn-request'], $parms['dfrn-confirm'], $parms['dfrn-notify'], $parms['dfrn-poll'], $parms['dfrn-poco'], dbesc(NETWORK_DFRN), intval($blocked), intval($pending) ); // find the contact record we just created if ($r) { $r = q("SELECT `id` FROM `contact` WHERE `uid` = %d AND `url` = '%s' AND `issued-id` = '%s' LIMIT 1", intval($uid), $parms['url'], $parms['issued-id'] ); if (DBM::is_result($r)) { $contact_record = $r[0]; Contact::updateAvatar($photo, $uid, $contact_record["id"], true); } } } if ($r === false) { notice(t('Failed to update contact record.') . EOL); return; } $hash = random_string() . (string) time(); // Generate a confirm_key if (is_array($contact_record)) { $ret = q("INSERT INTO `intro` ( `uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime`) VALUES ( %d, %d, 1, %d, '%s', '%s', '%s' )", intval($uid), intval($contact_record['id']), ((x($_POST,'knowyou') && ($_POST['knowyou'] == 1)) ? 1 : 0), dbesc(notags(trim($_POST['dfrn-request-message']))), dbesc($hash), dbesc(datetime_convert()) ); } // This notice will only be seen by the requestor if the requestor and requestee are on the same server. if (!$failed) { info(t('Your introduction has been sent.') . EOL); } // "Homecoming" - send the requestor back to their site to record the introduction. $dfrn_url = bin2hex(System::baseUrl() . '/profile/' . $nickname); $aes_allow = ((function_exists('openssl_encrypt')) ? 1 : 0); goaway($parms['dfrn-request'] . "?dfrn_url=$dfrn_url" . '&dfrn_version=' . DFRN_PROTOCOL_VERSION . '&confirm_key=' . $hash . (($aes_allow) ? "&aes_allow=1" : "") ); // NOTREACHED // END $network === NETWORK_DFRN } elseif (($network != NETWORK_PHANTOM) && ($url != "")) { /* Substitute our user's feed URL into $url template * Send the subscriber home to subscribe */ // Diaspora needs the uri in the format user@domain.tld // Diaspora will support the remote subscription in a future version if ($network == NETWORK_DIASPORA) { $uri = $nickname . '@' . $a->get_hostname(); if ($a->get_path()) { $uri .= '/' . $a->get_path(); } $uri = urlencode($uri); } else { $uri = System::baseUrl() . '/profile/' . $nickname; } $url = str_replace('{uri}', $uri, $url); goaway($url); // NOTREACHED // END $network != NETWORK_PHANTOM } else { notice(t("Remote subscription can't be done for your network. Please subscribe directly on your system.") . EOL); return; } } return; } function dfrn_request_content(App $a) { if (($a->argc != 2) || (!count($a->profile))) { return ""; } // "Homecoming". Make sure we're logged in to this site as the correct user. Then offer a confirm button // to send us to the post section to record the introduction. if (x($_GET, 'dfrn_url')) { if (!local_user()) { info(t("Please login to confirm introduction.") . EOL); /* setup the return URL to come back to this page if they use openid */ return Login::form(); } // Edge case, but can easily happen in the wild. This person is authenticated, // but not as the person who needs to deal with this request. if ($a->user['nickname'] != $a->argv[1]) { notice(t("Incorrect identity currently logged in. Please login to <strong>this</strong> profile.") . EOL); return Login::form(); } $dfrn_url = notags(trim(hex2bin($_GET['dfrn_url']))); $aes_allow = x($_GET, 'aes_allow') && $_GET['aes_allow'] == 1 ? 1 : 0; $confirm_key = x($_GET, 'confirm_key') ? $_GET['confirm_key'] : ""; // Checking fastlane for validity if (x($_SESSION, "fastlane") && (normalise_link($_SESSION["fastlane"]) == normalise_link($dfrn_url))) { $_POST["dfrn_url"] = $dfrn_url; $_POST["confirm_key"] = $confirm_key; $_POST["localconfirm"] = 1; $_POST["hidden-contact"] = 0; $_POST["submit"] = t('Confirm'); dfrn_request_post($a); killme(); return; // NOTREACHED } $tpl = get_markup_template("dfrn_req_confirm.tpl"); $o = replace_macros($tpl, array( '$dfrn_url' => $dfrn_url, '$aes_allow' => (($aes_allow) ? '<input type="hidden" name="aes_allow" value="1" />' : "" ), '$hidethem' => t('Hide this contact'), '$hidechecked' => '', '$confirm_key' => $confirm_key, '$welcome' => sprintf(t('Welcome home %s.'), $a->user['username']), '$please' => sprintf(t('Please confirm your introduction/connection request to %s.'), $dfrn_url), '$submit' => t('Confirm'), '$uid' => $_SESSION['uid'], '$nickname' => $a->user['nickname'], 'dfrn_rawurl' => $_GET['dfrn_url'] )); return $o; } elseif ((x($_GET, 'confirm_key')) && strlen($_GET['confirm_key'])) { // we are the requestee and it is now safe to send our user their introduction, // We could just unblock it, but first we have to jump through a few hoops to // send an email, or even to find out if we need to send an email. $intro = q("SELECT * FROM `intro` WHERE `hash` = '%s' LIMIT 1", dbesc($_GET['confirm_key']) ); if (DBM::is_result($intro)) { $r = q("SELECT `contact`.*, `user`.* FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid` WHERE `contact`.`id` = %d LIMIT 1", intval($intro[0]['contact-id']) ); $auto_confirm = false; if (DBM::is_result($r)) { if ($r[0]['page-flags'] != PAGE_NORMAL && $r[0]['page-flags'] != PAGE_PRVGROUP) { $auto_confirm = true; } if (!$auto_confirm) { notification(array( 'type' => NOTIFY_INTRO, 'notify_flags' => $r[0]['notify-flags'], 'language' => $r[0]['language'], 'to_name' => $r[0]['username'], 'to_email' => $r[0]['email'], 'uid' => $r[0]['uid'], 'link' => System::baseUrl() . '/notifications/intros', 'source_name' => ((strlen(stripslashes($r[0]['name']))) ? stripslashes($r[0]['name']) : t('[Name Withheld]')), 'source_link' => $r[0]['url'], 'source_photo' => $r[0]['photo'], 'verb' => ACTIVITY_REQ_FRIEND, 'otype' => 'intro' )); } if ($auto_confirm) { require_once 'mod/dfrn_confirm.php'; $handsfree = array( 'uid' => $r[0]['uid'], 'node' => $r[0]['nickname'], 'dfrn_id' => $r[0]['issued-id'], 'intro_id' => $intro[0]['id'], 'duplex' => (($r[0]['page-flags'] == PAGE_FREELOVE) ? 1 : 0), 'activity' => intval(PConfig::get($r[0]['uid'], 'system', 'post_newfriend')) ); dfrn_confirm_post($a, $handsfree); } } if (!$auto_confirm) { // If we are auto_confirming, this record will have already been nuked // in dfrn_confirm_post() $r = q("UPDATE `intro` SET `blocked` = 0 WHERE `hash` = '%s'", dbesc($_GET['confirm_key']) ); } } killme(); return; // NOTREACHED } else { // Normal web request. Display our user's introduction form. if ((Config::get('system', 'block_public')) && (!local_user()) && (!remote_user())) { if (!Config::get('system', 'local_block')) { notice(t('Public access denied.') . EOL); return; } } // Try to auto-fill the profile address // At first look if an address was provided // Otherwise take the local address if (x($_GET, 'addr') && ($_GET['addr'] != "")) { $myaddr = hex2bin($_GET['addr']); } elseif (x($_GET, 'address') && ($_GET['address'] != "")) { $myaddr = $_GET['address']; } elseif (local_user()) { if (strlen($a->path)) { $myaddr = System::baseUrl() . '/profile/' . $a->user['nickname']; } else { $myaddr = $a->user['nickname'] . '@' . substr(System::baseUrl(), strpos(System::baseUrl(), '://') + 3); } } else { // last, try a zrl $myaddr = get_my_url(); } $target_addr = $a->profile['nickname'] . '@' . substr(System::baseUrl(), strpos(System::baseUrl(), '://') + 3); /* The auto_request form only has the profile address * because nobody is going to read the comments and * it doesn't matter if they know you or not. */ if ($a->profile['page-flags'] == PAGE_NORMAL) { $tpl = get_markup_template('dfrn_request.tpl'); } else { $tpl = get_markup_template('auto_request.tpl'); } $page_desc = t("Please enter your 'Identity Address' from one of the following supported communications networks:"); $invite_desc = sprintf( t('If you are not yet a member of the free social web, <a href="%s/siteinfo">follow this link to find a public Friendica site and join us today</a>.'), get_server() ); $o = replace_macros($tpl, array( '$header' => t('Friend/Connection Request'), '$desc' => t('Examples: jojo@demo.friendica.com, http://demo.friendica.com/profile/jojo, testuser@gnusocial.de'), '$pls_answer' => t('Please answer the following:'), '$does_know_you' => array('knowyou', sprintf(t('Does %s know you?'), $a->profile['name']), false, '', array(t('No'), t('Yes'))), '$add_note' => t('Add a personal note:'), '$page_desc' => $page_desc, '$friendica' => t('Friendica'), '$statusnet' => t('GNU Social (Pleroma, Mastodon)'), '$diaspora' => t('Diaspora (Socialhome, Hubzilla)'), '$diasnote' => sprintf(t(' - please do not use this form. Instead, enter %s into your Diaspora search bar.'), $target_addr), '$your_address' => t('Your Identity Address:'), '$invite_desc' => $invite_desc, '$submit' => t('Submit Request'), '$cancel' => t('Cancel'), '$nickname' => $a->argv[1], '$name' => $a->profile['name'], '$myaddr' => $myaddr )); return $o; } return; // Somebody is fishing. }