500 lines
14 KiB
PHP
500 lines
14 KiB
PHP
<?php
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// There are two possible entry points. Both are called via POST.
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function dfrn_confirm_post(&$a) {
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if($a->argc > 1)
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$node = $a->argv[1];
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// Main entry point. Our user received a friend request notification (perhaps
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// from another site) and clicked 'Accept'. $POST['source_url'] is not set.
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// They will perform the following:
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if(! x($_POST,'source_url')) {
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$uid = get_uid();
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if(! $uid) {
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notice( t('Permission denied.') . EOL );
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return;
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}
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// These come from the friend request notification form.
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$dfrn_id = ((x($_POST,'dfrn_id')) ? notags(trim($_POST['dfrn_id'])) : "");
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$intro_id = intval($_POST['intro_id']);
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$duplex = intval($_POST['duplex']);
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// The other person will have been issued an ID when they first requested friendship.
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// Locate their record. At this time, their record will have both pending and blocked set to 1.
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$r = q("SELECT * FROM `contact` WHERE `issued-id` = '%s' AND `uid` = %d LIMIT 1",
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dbesc($dfrn_id),
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intval($uid)
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);
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if(! count($r)) {
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notice( t('Contact not found.') . EOL );
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return;
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}
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$contact_id = $r[0]['id'];
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$relation = $r[0]['rel'];
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$site_pubkey = $r[0]['site-pubkey'];
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$dfrn_confirm = $r[0]['confirm'];
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$aes_allow = $r[0]['aes_allow'];
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// Generate a key pair for all further communications with this person.
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// We have a keypair for every contact, and a site key for unknown people.
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// This provides a means to carry on relationships with other people if
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// any single key is compromised. It is a robust key. We're much more
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// worried about key leakage than anybody cracking it.
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$res = openssl_pkey_new(array(
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'digest_alg' => 'whirlpool',
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'private_key_bits' => 4096,
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'encrypt_key' => false )
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);
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$private_key = '';
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openssl_pkey_export($res, $private_key);
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$pubkey = openssl_pkey_get_details($res);
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$public_key = $pubkey["key"];
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// Save the private key. Send them the public key.
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$r = q("UPDATE `contact` SET `prvkey` = '%s' WHERE `id` = %d AND `uid` = %d LIMIT 1",
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dbesc($private_key),
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intval($contact_id),
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intval($uid)
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);
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$params = array();
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// Per the protocol document, we will verify both ends by encrypting the dfrn_id with our
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// site private key (person on the other end can decrypt it with our site public key).
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// Then encrypt our profile URL with the other person's site public key. They can decrypt
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// it with their site private key. If the decryption on the other end fails for either
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// item, it indicates tampering or key failure on at least one site and we will not be
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// able to provide a secure communication pathway.
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// If other site is willing to accept full encryption, (aes_allow is 1 AND we have php5.3
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// or later) then we encrypt the personal public key we send them using AES-256-CBC and a
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// random key which is encrypted with their site public key.
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$src_aes_key = random_string();
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$result = '';
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openssl_private_encrypt($dfrn_id,$result,$a->user['prvkey']);
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$params['dfrn_id'] = bin2hex($result);
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$params['public_key'] = $public_key;
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$my_url = $a->get_baseurl() . '/profile/' . $a->user['nickname'];
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openssl_public_encrypt($my_url, $params['source_url'], $site_pubkey);
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$params['source_url'] = bin2hex($params['source_url']);
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if($aes_allow && function_exists('openssl_encrypt')) {
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openssl_public_encrypt($src_aes_key, $params['aes_key'], $site_pubkey);
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$params['aes_key'] = bin2hex($params['aes_key']);
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$params['public_key'] = bin2hex(openssl_encrypt($public_key,'AES-256-CBC',$src_aes_key));
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}
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$params['dfrn_version'] = '2.0';
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if($duplex == 1)
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$params['duplex'] = 1;
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// POST all this stuff to the other site.
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$res = post_url($dfrn_confirm,$params);
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// Now figure out what they responded. Try to be robust if the remote site is
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// having difficulty and throwing up errors of some kind.
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$leading_junk = substr($res,0,strpos($res,'<?xml'));
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$res = substr($res,strpos($res,'<?xml'));
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if(! strlen($res)) {
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// No XML at all, this exchange is messed up really bad.
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// We shouldn't proceed, because the xml parser might choke,
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// and $status is going to be zero, which indicates success.
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// We can hardly call this a success.
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notice( t('Response from remote site was not understood.') . EOL);
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return;
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}
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if(strlen($leading_junk) && get_config('system','debugging')) {
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// This might be more common. Mixed error text and some XML.
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// If we're configured for debugging, show the text. Proceed in either case.
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notice( t('Unexpected response from remote site: ') . EOL . $leading_junk . EOL );
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}
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$xml = simplexml_load_string($res);
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$status = (int) $xml->status;
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$message = unxmlify($xml->message); // human readable text of what may have gone wrong.
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switch($status) {
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case 0:
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notice( t("Confirmation completed successfully.") . EOL);
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if(strlen($message))
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notice( t('Remote site reported: ') . $message . EOL);
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break;
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case 1:
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// birthday paradox - generate new dfrn-id and fall through.
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$new_dfrn_id = random_string();
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$r = q("UPDATE contact SET `issued-id` = '%s' WHERE `id` = %d AND `uid` = %d LIMIT 1",
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dbesc($new_dfrn_id),
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intval($contact_id),
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intval($uid)
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);
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case 2:
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notice( t("Temporary failure. Please wait and try again.") . EOL);
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if(strlen($message))
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notice( t('Remote site reported: ') . $message . EOL);
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break;
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case 3:
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notice( t("Introduction failed or was revoked.") . EOL);
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if(strlen($message))
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notice( t('Remote site reported: ') . $message . EOL);
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break;
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}
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if(($status == 0) && ($intro_id)) {
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// Success. Delete the notification.
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$r = q("DELETE FROM `intro` WHERE `id` = %d AND `uid` = %d LIMIT 1",
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intval($intro_id),
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intval($uid)
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);
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}
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if($status != 0)
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return;
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// We have now established a relationship with the other site.
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// Let's make our own personal copy of their profile photo so we don't have
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// to always load it from their site.
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require_once("Photo.php");
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$photo_failure = false;
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$r = q("SELECT `photo` FROM `contact` WHERE `id` = %d LIMIT 1",
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intval($contact_id));
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if(count($r)) {
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$filename = basename($r[0]['photo']);
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$img_str = fetch_url($r[0]['photo'],true);
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$img = new Photo($img_str);
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if($img->is_valid()) {
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$img->scaleImageSquare(175);
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$hash = photo_new_resource();
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$r = $img->store($uid, $contact_id, $hash, $filename, t('Contact Photos'), 4 );
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if($r === false)
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$photo_failure = true;
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$img->scaleImage(80);
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$r = $img->store($uid, $contact_id, $hash, $filename, t('Contact Photos'), 5 );
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if($r === false)
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$photo_failure = true;
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$photo = $a->get_baseurl() . '/photo/' . $hash . '-4.jpg';
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$thumb = $a->get_baseurl() . '/photo/' . $hash . '-5.jpg';
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}
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else
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$photo_failure = true;
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}
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else
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$photo_failure = true;
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if($photo_failure) {
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$photo = $a->get_baseurl() . '/images/default-profile.jpg';
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$thumb = $a->get_baseurl() . '/images/default-profile-sm.jpg';
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}
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$new_relation = REL_VIP;
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if(($relation == REL_FAN) || ($duplex))
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$new_relation = REL_BUD;
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$r = q("UPDATE `contact` SET `photo` = '%s',
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`thumb` = '%s',
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`rel` = %d,
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`name-date` = '%s',
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`uri-date` = '%s',
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`avatar-date` = '%s',
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`blocked` = 0,
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`pending` = 0,
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`duplex` = %d,
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`network` = 'dfrn' WHERE `id` = %d LIMIT 1
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",
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dbesc($photo),
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dbesc($thumb),
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intval($new_relation),
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dbesc(datetime_convert()),
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dbesc(datetime_convert()),
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dbesc(datetime_convert()),
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intval($duplex),
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intval($contact_id)
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);
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if($r === false)
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notice( t('Unable to set contact photo.') . EOL);
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// Let's send our user to the contact editor in case they want to
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// do anything special with this new friend.
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goaway($a->get_baseurl() . '/contacts/' . intval($contact_id));
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return; //NOTREACHED
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}
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// End of first scenario. [Local confirmation of remote friend request].
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// Begin scenario two. This is the remote response to the above scenario.
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// This will take place on the site that originally initiated the friend request.
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// In the section above where the confirming party makes a POST and
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// retrieves xml status information, they are communicating with the following code.
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if(x($_POST,'source_url')) {
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// We are processing an external confirmation to an introduction created by our user.
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$public_key = $_POST['public_key'];
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$dfrn_id = hex2bin($_POST['dfrn_id']);
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$source_url = hex2bin($_POST['source_url']);
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$aes_key = $_POST['aes_key'];
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$duplex = $_POST['duplex'];
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$version_id = (float) $_POST['dfrn_version'];
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// If $aes_key is set, both of these items require unpacking from the hex transport encoding.
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if(x($aes_key)) {
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$aes_key = hex2bin($aes_key);
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$public_key = hex2bin($public_key);
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}
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// Find our user's account
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$r = q("SELECT * FROM `user` WHERE `nickname` = '%s' LIMIT 1",
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dbesc($node));
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if(! count($r)) {
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$message = t('No user record found for ') . '\'' . $node . '\'';
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xml_status(3,$message); // failure
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// NOTREACHED
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}
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$my_prvkey = $r[0]['prvkey'];
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$local_uid = $r[0]['uid'];
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if(! strstr($my_prvkey,'BEGIN RSA PRIVATE KEY')) {
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$message = t('Our site encryption key is apparently messed up.');
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xml_status(3,$message);
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}
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// verify everything
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$decrypted_source_url = "";
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openssl_private_decrypt($source_url,$decrypted_source_url,$my_prvkey);
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if(! strlen($decrypted_source_url)) {
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$message = t('Empty site URL was provided or URL could not be decrypted by us.');
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xml_status(3,$message);
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// NOTREACHED
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}
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$ret = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
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dbesc($decrypted_source_url),
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intval($local_uid)
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);
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if(! count($ret)) {
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// this is either a bogus confirmation (?) or we deleted the original introduction.
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$message = t('Contact record was not found for you on our site.');
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xml_status(3,$message);
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return; // NOTREACHED
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}
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$relation = $ret[0]['rel'];
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// Decrypt all this stuff we just received
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$foreign_pubkey = $ret[0]['site-pubkey'];
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$dfrn_record = $ret[0]['id'];
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$decrypted_dfrn_id = "";
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openssl_public_decrypt($dfrn_id,$decrypted_dfrn_id,$foreign_pubkey);
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if(strlen($aes_key)) {
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$decrypted_aes_key = "";
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openssl_private_decrypt($aes_key,$decrypted_aes_key,$my_prvkey);
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$dfrn_pubkey = openssl_decrypt($public_key,'AES-256-CBC',$decrypted_aes_key);
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}
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else {
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$dfrn_pubkey = $public_key;
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}
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$r = q("SELECT * FROM `contact` WHERE `dfrn-id` = '%s' LIMIT 1",
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dbesc($decrypted_dfrn_id),
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intval($local_uid)
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);
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if(count($r)) {
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$message = t('The ID provided by your system is a duplicate on our system. It should work if you try again.');
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xml_status(1,$message); // Birthday paradox - duplicate dfrn-id
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// NOTREACHED
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}
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$r = q("UPDATE `contact` SET `dfrn-id` = '%s', `pubkey` = '%s' WHERE `id` = %d LIMIT 1",
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dbesc($decrypted_dfrn_id),
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dbesc($dfrn_pubkey),
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intval($dfrn_record)
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);
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if(! count($r)) {
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$message = t('Unable to set your contact credentials on our system.');
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xml_status(3,$message);
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}
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// We're good but now we have to scrape the profile photo and send notifications.
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require_once("Photo.php");
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$photo_failure = false;
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$r = q("SELECT `photo` FROM `contact` WHERE `id` = %d LIMIT 1",
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intval($dfrn_record));
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if(count($r)) {
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$filename = basename($r[0]['photo']);
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$img_str = fetch_url($r[0]['photo'],true);
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$img = new Photo($img_str);
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if($img->is_valid()) {
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$img->scaleImageSquare(175);
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$hash = photo_new_resource();
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$r = $img->store($local_uid, $dfrn_record, $hash, $filename, t('Contact Photos') , 4);
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if($r === false)
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$photo_failure = true;
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$img->scaleImage(80);
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$r = $img->store($local_uid, $dfrn_record, $hash, $filename, t('Contact Photos') , 5);
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if($r === false)
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$photo_failure = true;
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$photo = $a->get_baseurl() . '/photo/' . $hash . '-4.jpg';
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$thumb = $a->get_baseurl() . '/photo/' . $hash . '-5.jpg';
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}
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else
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$photo_failure = true;
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}
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else
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$photo_failure = true;
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if($photo_failure) {
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$photo = $a->get_baseurl() . '/images/default-profile.jpg';
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$thumb = $a->get_baseurl() . '/images/default-profile-sm.jpg';
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}
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$new_relation = REL_FAN;
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if(($relation == REL_VIP) || ($duplex))
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$new_relation = REL_BUD;
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$r = q("UPDATE `contact` SET
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`photo` = '%s',
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`thumb` = '%s',
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`rel` = %d,
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`name-date` = '%s',
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`uri-date` = '%s',
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`avatar-date` = '%s',
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`blocked` = 0,
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`pending` = 0,
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`duplex` = %d,
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`network` = 'dfrn' WHERE `id` = %d LIMIT 1
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",
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dbesc($photo),
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dbesc($thumb),
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intval($new_relation),
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dbesc(datetime_convert()),
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dbesc(datetime_convert()),
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dbesc(datetime_convert()),
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intval($duplex),
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intval($dfrn_record)
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);
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if($r === false) { // indicates schema is messed up or total db failure
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$message = t('Unable to update your contact profile details on our system');
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xml_status(3,$message);
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}
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// Otherwise everything seems to have worked and we are almost done. Yay!
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// Send an email notification
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$r = q("SELECT * FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
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WHERE `contact`.`id` = %d LIMIT 1",
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intval($dfrn_record)
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);
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if((count($r)) && ($r[0]['notify-flags'] & NOTIFY_CONFIRM)) {
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$tpl = (($new_relation == REL_BUD)
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? load_view_file('view/friend_complete_eml.tpl')
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: load_view_file('view/intro_complete_eml.tpl'));
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$email_tpl = replace_macros($tpl, array(
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'$sitename' => $a->config['sitename'],
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'$siteurl' => $a->get_baseurl(),
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'$username' => $r[0]['username'],
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'$email' => $r[0]['email'],
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'$fn' => $r[0]['name'],
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'$dfrn_url' => $r[0]['url'],
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'$uid' => $newuid )
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);
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$res = mail($r[0]['email'], t("Connection accepted at ") . $a->config['sitename'],
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$email_tpl, 'From: ' . t('Administrator') . '@' . $_SERVER[SERVER_NAME] );
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if(!$res) {
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// pointless throwing an error here and confusing the person at the other end of the wire.
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}
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}
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xml_status(0); // Success
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return; // NOTREACHED
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////////////////////// End of this scenario ///////////////////////////////////////////////
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}
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// somebody arrived here by mistake or they are fishing. Send them to the homepage.
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goaway($a->get_baseurl());
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// NOTREACHED
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}
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