<?php /* * Module: dfrn_confirm * Purpose: Friendship acceptance for DFRN contacts * * There are two possible entry points and three scenarios. * * 1. A form was submitted by our user approving a friendship that originated elsewhere. * This may also be called from dfrn_request to automatically approve a friendship. * * 2. We may be the target or other side of the conversation to scenario 1, and will * interact with that process on our own user's behalf. * */ function dfrn_confirm_post(&$a,$handsfree = null) { if(is_array($handsfree)) { /** * We were called directly from dfrn_request due to automatic friend acceptance. * Any $_POST parameters we may require are supplied in the $handsfree array. * */ $node = $handsfree['node']; $a->interactive = false; // notice() becomes a no-op since nobody is there to see it } else { if($a->argc > 1) $node = $a->argv[1]; } /** * * Main entry point. Scenario 1. Our user received a friend request notification (perhaps * from another site) and clicked 'Approve'. * $POST['source_url'] is not set. If it is, it indicates Scenario 2. * * We may also have been called directly from dfrn_request ($handsfree != null) due to * this being a page type which supports automatic friend acceptance. That is also Scenario 1 * since we are operating on behalf of our registered user to approve a friendship. * */ if(! x($_POST,'source_url')) { $uid = ((is_array($handsfree)) ? $handsfree['uid'] : local_user()); if(! $uid) { notice( t('Permission denied.') . EOL ); return; } $user = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($uid) ); if(! $user) { notice( t('Profile not found.') . EOL ); return; } // These data elements may come from either the friend request notification form or $handsfree array. if(is_array($handsfree)) { logger('dfrn_confirm: Confirm in handsfree mode'); $dfrn_id = $handsfree['dfrn_id']; $intro_id = $handsfree['intro_id']; $duplex = $handsfree['duplex']; } else { $dfrn_id = ((x($_POST,'dfrn_id')) ? notags(trim($_POST['dfrn_id'])) : ""); $intro_id = ((x($_POST,'intro_id')) ? intval($_POST['intro_id']) : 0 ); $duplex = ((x($_POST,'duplex')) ? intval($_POST['duplex']) : 0 ); $cid = ((x($_POST,'contact_id')) ? intval($_POST['contact_id']) : 0 ); } /** * * Ensure that dfrn_id has precedence when we go to find the contact record. * We only want to search based on contact id if there is no dfrn_id, * e.g. for OStatus network followers. * */ if(strlen($dfrn_id)) $cid = 0; logger('dfrn_confirm: Confirming request for dfrn_id (issued) ' . $dfrn_id); if($cid) logger('dfrn_confirm: Confirming follower with contact_id: ' . $cid); /** * * The other person will have been issued an ID when they first requested friendship. * Locate their record. At this time, their record will have both pending and blocked set to 1. * There won't be any dfrn_id if this is a network follower, so use the contact_id instead. * */ $r = q("SELECT * FROM `contact` WHERE ( ( `issued-id` != '' AND `issued-id` = '%s' ) OR ( `id` = %d AND `id` != 0 ) ) AND `uid` = %d LIMIT 1", dbesc($dfrn_id), intval($cid), intval($uid) ); if(! count($r)) { logger('dfrn_confirm: Contact not found in DB.'); notice( t('Contact not found.') . EOL ); return; } $contact = $r[0]; $contact_id = $contact['id']; $relation = $contact['rel']; $site_pubkey = $contact['site-pubkey']; $dfrn_confirm = $contact['confirm']; $aes_allow = $contact['aes_allow']; $network = ((strlen($contact['issued-id'])) ? 'dfrn' : 'stat'); if($network === 'dfrn') { /** * * Generate a key pair for all further communications with this person. * We have a keypair for every contact, and a site key for unknown people. * This provides a means to carry on relationships with other people if * any single key is compromised. It is a robust key. We're much more * worried about key leakage than anybody cracking it. * */ $res = openssl_pkey_new(array( 'digest_alg' => 'sha1', 'private_key_bits' => 4096, 'encrypt_key' => false ) ); $private_key = ''; openssl_pkey_export($res, $private_key); $pubkey = openssl_pkey_get_details($res); $public_key = $pubkey["key"]; // Save the private key. Send them the public key. $r = q("UPDATE `contact` SET `prvkey` = '%s' WHERE `id` = %d AND `uid` = %d LIMIT 1", dbesc($private_key), intval($contact_id), intval($uid) ); $params = array(); /** * * Per the DFRN protocol, we will verify both ends by encrypting the dfrn_id with our * site private key (person on the other end can decrypt it with our site public key). * Then encrypt our profile URL with the other person's site public key. They can decrypt * it with their site private key. If the decryption on the other end fails for either * item, it indicates tampering or key failure on at least one site and we will not be * able to provide a secure communication pathway. * * If other site is willing to accept full encryption, (aes_allow is 1 AND we have php5.3 * or later) then we encrypt the personal public key we send them using AES-256-CBC and a * random key which is encrypted with their site public key. * */ $src_aes_key = random_string(); $result = ''; openssl_private_encrypt($dfrn_id,$result,$user[0]['prvkey']); $params['dfrn_id'] = bin2hex($result); $params['public_key'] = $public_key; $my_url = $a->get_baseurl() . '/profile/' . $user[0]['nickname']; openssl_public_encrypt($my_url, $params['source_url'], $site_pubkey); $params['source_url'] = bin2hex($params['source_url']); if($aes_allow && function_exists('openssl_encrypt')) { openssl_public_encrypt($src_aes_key, $params['aes_key'], $site_pubkey); $params['aes_key'] = bin2hex($params['aes_key']); $params['public_key'] = bin2hex(openssl_encrypt($public_key,'AES-256-CBC',$src_aes_key)); } $params['dfrn_version'] = DFRN_PROTOCOL_VERSION ; if($duplex == 1) $params['duplex'] = 1; logger('dfrn_confirm: Confirm: posting data to ' . $dfrn_confirm . ': ' . print_r($params,true), LOGGER_DATA); /** * * POST all this stuff to the other site. * Temporarily raise the network timeout to 120 seconds because the default 60 * doesn't always give the other side quite enough time to decrypt everything. * */ $a->config['system']['curl_timeout'] = 120; $res = post_url($dfrn_confirm,$params); logger('dfrn_confirm: Confirm: received data: ' . $res, LOGGER_DATA); // Now figure out what they responded. Try to be robust if the remote site is // having difficulty and throwing up errors of some kind. $leading_junk = substr($res,0,strpos($res,'<?xml')); $res = substr($res,strpos($res,'<?xml')); if(! strlen($res)) { // No XML at all, this exchange is messed up really bad. // We shouldn't proceed, because the xml parser might choke, // and $status is going to be zero, which indicates success. // We can hardly call this a success. notice( t('Response from remote site was not understood.') . EOL); return; } if(strlen($leading_junk) && get_config('system','debugging')) { // This might be more common. Mixed error text and some XML. // If we're configured for debugging, show the text. Proceed in either case. notice( t('Unexpected response from remote site: ') . EOL . $leading_junk . EOL ); } $xml = parse_xml_string($res); $status = (int) $xml->status; $message = unxmlify($xml->message); // human readable text of what may have gone wrong. switch($status) { case 0: notice( t("Confirmation completed successfully.") . EOL); if(strlen($message)) notice( t('Remote site reported: ') . $message . EOL); break; case 1: // birthday paradox - generate new dfrn-id and fall through. $new_dfrn_id = random_string(); $r = q("UPDATE contact SET `issued-id` = '%s' WHERE `id` = %d AND `uid` = %d LIMIT 1", dbesc($new_dfrn_id), intval($contact_id), intval($uid) ); case 2: notice( t("Temporary failure. Please wait and try again.") . EOL); if(strlen($message)) notice( t('Remote site reported: ') . $message . EOL); break; case 3: notice( t("Introduction failed or was revoked.") . EOL); if(strlen($message)) notice( t('Remote site reported: ') . $message . EOL); break; } if(($status == 0) && ($intro_id)) { // Success. Delete the notification. $r = q("DELETE FROM `intro` WHERE `id` = %d AND `uid` = %d LIMIT 1", intval($intro_id), intval($uid) ); } if($status != 0) return; } /* * * We have now established a relationship with the other site. * Let's make our own personal copy of their profile photo so we don't have * to always load it from their site. * * We will also update the contact record with the nature and scope of the relationship. * */ require_once("Photo.php"); $photos = import_profile_photo($contact['photo'],$uid,$contact_id); logger('dfrn_confirm: confirm - imported photos'); if($network === 'dfrn') { $new_relation = CONTACT_IS_FOLLOWER; if(($relation == CONTACT_IS_SHARING) || ($duplex)) $new_relation = CONTACT_IS_FRIEND; if(($relation == CONTACT_IS_SHARING) && ($duplex)) $duplex = 0; $r = q("UPDATE `contact` SET `photo` = '%s', `thumb` = '%s', `micro` = '%s', `rel` = %d, `name-date` = '%s', `uri-date` = '%s', `avatar-date` = '%s', `blocked` = 0, `pending` = 0, `duplex` = %d, `network` = 'dfrn' WHERE `id` = %d LIMIT 1 ", dbesc($photos[0]), dbesc($photos[1]), dbesc($photos[2]), intval($new_relation), dbesc(datetime_convert()), dbesc(datetime_convert()), dbesc(datetime_convert()), intval($duplex), intval($contact_id) ); } else { // $network !== 'dfrn' $notify = ''; $poll = ''; $arr = lrdd($contact['url']); if(count($arr)) { foreach($arr as $link) { if($link['@attributes']['rel'] === 'salmon') $notify = $link['@attributes']['href']; if($link['@attributes']['rel'] === NAMESPACE_FEED) $poll = $link['@attributes']['href']; } } $r = q("DELETE FROM `intro` WHERE `id` = %d AND `uid` = %d LIMIT 1", intval($intro_id), intval($uid) ); $r = q("UPDATE `contact` SET `photo` = '%s', `thumb` = '%s', `micro` = '%s', `name-date` = '%s', `uri-date` = '%s', `avatar-date` = '%s', `notify` = '%s', `poll` = '%s', `blocked` = 0, `pending` = 0, `network` = 'stat' WHERE `id` = %d LIMIT 1 ", dbesc($photos[0]), dbesc($photos[1]), dbesc($photos[2]), dbesc(datetime_convert()), dbesc(datetime_convert()), dbesc(datetime_convert()), dbesc($notify), dbesc($poll), intval($contact_id) ); } if($r === false) notice( t('Unable to set contact photo.') . EOL); // reload contact info $r = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1", intval($contact_id) ); if(count($r)) $contact = $r[0]; else $contact = null; // Send a new friend post if we are allowed to... $r = q("SELECT `hide-friends` FROM `profile` WHERE `uid` = %d AND `is-default` = 1 LIMIT 1", intval($uid) ); if((count($r)) && ($r[0]['hide-friends'] == 0) && (is_array($contact)) && isset($new_relation) && ($new_relation == CONTACT_IS_FRIEND)) { require_once('include/items.php'); $self = q("SELECT * FROM `contact` WHERE `self` = 1 AND `uid` = %d LIMIT 1", intval($uid) ); if(count($self)) { $arr = array(); $arr['uri'] = $arr['parent-uri'] = item_new_uri($a->get_hostname(), $uid); $arr['uid'] = $uid; $arr['contact-id'] = $self[0]['id']; $arr['wall'] = 1; $arr['type'] = 'wall'; $arr['gravity'] = 0; $arr['author-name'] = $arr['owner-name'] = $self[0]['name']; $arr['author-link'] = $arr['owner-link'] = $self[0]['url']; $arr['author-avatar'] = $arr['owner-avatar'] = $self[0]['thumb']; $arr['verb'] = ACTIVITY_FRIEND; $arr['object-type'] = ACTIVITY_OBJ_PERSON; $A = '[url=' . $self[0]['url'] . ']' . $self[0]['name'] . '[/url]'; $B = '[url=' . $contact['url'] . ']' . $contact['name'] . '[/url]'; $BPhoto = '[url=' . $contact['url'] . ']' . '[img]' . $contact['thumb'] . '[/img][/url]'; $arr['body'] = sprintf( t('%1$s is now friends with %2$s'), $A, $B)."\n\n\n".$Bphoto; $arr['object'] = '<object><type>' . ACTIVITY_OBJ_PERSON . '</type><title>' . $contact['name'] . '</title>' . '<id>' . $contact['url'] . '/' . $contact['name'] . '</id>'; $arr['object'] .= '<link>' . xmlify('<link rel="alternate" type="text/html" href="' . $contact['url'] . '" />' . "\n"); $arr['object'] .= xmlify('<link rel="photo" type="image/jpeg" href="' . $contact['thumb'] . '" />' . "\n"); $arr['object'] .= '</link></object>' . "\n"; $arr['last-child'] = 1; $arr['allow_cid'] = $user[0]['allow_cid']; $arr['allow_gid'] = $user[0]['allow_gid']; $arr['deny_cid'] = $user[0]['deny_cid']; $arr['deny_gid'] = $user[0]['deny_gid']; $i = item_store($arr); if($i) proc_run('php',"include/notifier.php","activity","$i"); } } // Let's send our user to the contact editor in case they want to // do anything special with this new friend. if($handsfree === null) goaway($a->get_baseurl() . '/contacts/' . intval($contact_id)); else return; //NOTREACHED } /** * * * End of Scenario 1. [Local confirmation of remote friend request]. * * Begin Scenario 2. This is the remote response to the above scenario. * This will take place on the site that originally initiated the friend request. * In the section above where the confirming party makes a POST and * retrieves xml status information, they are communicating with the following code. * */ if(x($_POST,'source_url')) { // We are processing an external confirmation to an introduction created by our user. $public_key = ((x($_POST,'public_key')) ? $_POST['public_key'] : ''); $dfrn_id = ((x($_POST,'dfrn_id')) ? hex2bin($_POST['dfrn_id']) : ''); $source_url = ((x($_POST,'source_url')) ? hex2bin($_POST['source_url']) : ''); $aes_key = ((x($_POST,'aes_key')) ? $_POST['aes_key'] : ''); $duplex = ((x($_POST,'duplex')) ? intval($_POST['duplex']) : 0 ); $version_id = ((x($_POST,'dfrn_version')) ? (float) $_POST['dfrn_version'] : 2.0); logger('dfrn_confirm: requestee contacted: ' . $node); logger('dfrn_confirm: request: POST=' . print_r($_POST,true), LOGGER_DATA); // If $aes_key is set, both of these items require unpacking from the hex transport encoding. if(x($aes_key)) { $aes_key = hex2bin($aes_key); $public_key = hex2bin($public_key); } // Find our user's account $r = q("SELECT * FROM `user` WHERE `nickname` = '%s' LIMIT 1", dbesc($node)); if(! count($r)) { $message = sprintf(t('No user record found for \'%s\' '), $node); xml_status(3,$message); // failure // NOTREACHED } $my_prvkey = $r[0]['prvkey']; $local_uid = $r[0]['uid']; if(! strstr($my_prvkey,'PRIVATE KEY')) { $message = t('Our site encryption key is apparently messed up.'); xml_status(3,$message); } // verify everything $decrypted_source_url = ""; openssl_private_decrypt($source_url,$decrypted_source_url,$my_prvkey); if(! strlen($decrypted_source_url)) { $message = t('Empty site URL was provided or URL could not be decrypted by us.'); xml_status(3,$message); // NOTREACHED } $ret = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1", dbesc($decrypted_source_url), intval($local_uid) ); if(! count($ret)) { // this is either a bogus confirmation (?) or we deleted the original introduction. $message = t('Contact record was not found for you on our site.'); xml_status(3,$message); return; // NOTREACHED } $relation = $ret[0]['rel']; // Decrypt all this stuff we just received $foreign_pubkey = $ret[0]['site-pubkey']; $dfrn_record = $ret[0]['id']; $decrypted_dfrn_id = ""; openssl_public_decrypt($dfrn_id,$decrypted_dfrn_id,$foreign_pubkey); if(strlen($aes_key)) { $decrypted_aes_key = ""; openssl_private_decrypt($aes_key,$decrypted_aes_key,$my_prvkey); $dfrn_pubkey = openssl_decrypt($public_key,'AES-256-CBC',$decrypted_aes_key); } else { $dfrn_pubkey = $public_key; } $r = q("SELECT * FROM `contact` WHERE `dfrn-id` = '%s' LIMIT 1", dbesc($decrypted_dfrn_id) ); if(count($r)) { $message = t('The ID provided by your system is a duplicate on our system. It should work if you try again.'); xml_status(1,$message); // Birthday paradox - duplicate dfrn-id // NOTREACHED } $r = q("UPDATE `contact` SET `dfrn-id` = '%s', `pubkey` = '%s' WHERE `id` = %d LIMIT 1", dbesc($decrypted_dfrn_id), dbesc($dfrn_pubkey), intval($dfrn_record) ); if(! count($r)) { $message = t('Unable to set your contact credentials on our system.'); xml_status(3,$message); } // We're good but now we have to scrape the profile photo and send notifications. $r = q("SELECT `photo` FROM `contact` WHERE `id` = %d LIMIT 1", intval($dfrn_record)); if(count($r)) $photo = $r[0]['photo']; else $photo = $a->get_baseurl() . '/images/default-profile.jpg'; require_once("Photo.php"); $photos = import_profile_photo($photo,$local_uid,$dfrn_record); logger('dfrn_confirm: request - photos imported'); $new_relation = CONTACT_IS_SHARING; if(($relation == CONTACT_IS_FOLLOWER) || ($duplex)) $new_relation = CONTACT_IS_FRIEND; if(($relation == CONTACT_IS_FOLLOWER) && ($duplex)) $duplex = 0; $r = q("UPDATE `contact` SET `photo` = '%s', `thumb` = '%s', `micro` = '%s', `rel` = %d, `name-date` = '%s', `uri-date` = '%s', `avatar-date` = '%s', `blocked` = 0, `pending` = 0, `duplex` = %d, `network` = 'dfrn' WHERE `id` = %d LIMIT 1 ", dbesc($photos[0]), dbesc($photos[1]), dbesc($photos[2]), intval($new_relation), dbesc(datetime_convert()), dbesc(datetime_convert()), dbesc(datetime_convert()), intval($duplex), intval($dfrn_record) ); if($r === false) { // indicates schema is messed up or total db failure $message = t('Unable to update your contact profile details on our system'); xml_status(3,$message); } // Otherwise everything seems to have worked and we are almost done. Yay! // Send an email notification logger('dfrn_confirm: request: info updated'); $r = q("SELECT `contact`.*, `user`.* FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid` WHERE `contact`.`id` = %d LIMIT 1", intval($dfrn_record) ); if((count($r)) && ($r[0]['notify-flags'] & NOTIFY_CONFIRM)) { push_lang($r[0]['language']); $tpl = (($new_relation == CONTACT_IS_FRIEND) ? get_intltext_template('friend_complete_eml.tpl') : get_intltext_template('intro_complete_eml.tpl')); $email_tpl = replace_macros($tpl, array( '$sitename' => $a->config['sitename'], '$siteurl' => $a->get_baseurl(), '$username' => $r[0]['username'], '$email' => $r[0]['email'], '$fn' => $r[0]['name'], '$dfrn_url' => $r[0]['url'], '$uid' => $newuid ) ); $res = mail($r[0]['email'], sprintf( t("Connection accepted at %s") , $a->config['sitename']), $email_tpl, 'From: ' . t('Administrator') . '@' . $_SERVER['SERVER_NAME'] . "\n" . 'Content-type: text/plain; charset=UTF-8' . "\n" . 'Content-transfer-encoding: 8bit' ); if(!$res) { // pointless throwing an error here and confusing the person at the other end of the wire. } pop_lang(); } xml_status(0); // Success return; // NOTREACHED ////////////////////// End of this scenario /////////////////////////////////////////////// } // somebody arrived here by mistake or they are fishing. Send them to the homepage. goaway(z_root()); // NOTREACHED }