Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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<?php
// There are two possible entry points.
function dfrn_confirm_post(&$a,$handsfree = null) {
if(is_array($handsfree)) {
// 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. Our user received a friend request notification (perhaps
// from another site) and clicked 'Approve'. $POST['source_url'] is not set.
// OR we have been called directly from dfrn_request ($handsfree != null) due to
// this being a page type which supports automatic friend acceptance.
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 come from either the friend request notification form or $handsfree array.
if(is_array($handsfree)) {
$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'])) : "");
$intro_id = intval($_POST['intro_id']);
$duplex = intval($_POST['duplex']);
$cid = intval($_POST['contact_id']);
}
// 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)) {
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' => 'whirlpool',
'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 protocol document, 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;
// POST all this stuff to the other site.
$res = post_url($dfrn_confirm,$params);
// 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 );
}
$xml = simplexml_load_string($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.
require_once("Photo.php");
$photos = import_profile_photo($contact['photo'],$uid,$contact_id);
if($network === 'dfrn') {
$new_relation = REL_VIP;
if(($relation == REL_FAN) || ($duplex))
$new_relation = REL_BUD;
$r = q("UPDATE `contact` SET `photo` = '%s',
`thumb` = '%s',
`micro` = '%s',
`rel` = %d,
`name-date` = '%s',
`uri-date` = '%s',
`avatar-date` = '%s',
`blocked` = 0,
`pending` = 0,
`duplex` = %d,
`network` = 'dfrn' WHERE `id` = %d LIMIT 1
",
dbesc($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 {
$notify = '';
$poll = '';
// $network !== 'dfrn'
$arr = lrdd($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);
// 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($contact_id));
return; //NOTREACHED
}
// End of first scenario. [Local confirmation of remote friend request].
// Begin scenario two. This is the remote response to the above scenario.
// This will take place on the site that originally initiated the friend request.
// In the section above where the confirming party makes a POST and
// retrieves xml status information, they are communicating with the following code.
if(x($_POST,'source_url')) {
// We are processing an external confirmation to an introduction created by our user.
$public_key = $_POST['public_key'];
$dfrn_id = hex2bin($_POST['dfrn_id']);
$source_url = hex2bin($_POST['source_url']);
$aes_key = $_POST['aes_key'];
$duplex = $_POST['duplex'];
$version_id = (float) $_POST['dfrn_version'];
// 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 = t('No user record found for ') . '\'' . $node . '\'';
xml_status(3,$message); // failure
// NOTREACHED
}
$my_prvkey = $r[0]['prvkey'];
$local_uid = $r[0]['uid'];
if(! strstr($my_prvkey,'BEGIN RSA 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),
intval($local_uid)
);
if(count($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);
$new_relation = REL_FAN;
if(($relation == REL_VIP) || ($duplex))
$new_relation = REL_BUD;
$r = q("UPDATE `contact` SET
`photo` = '%s',
`thumb` = '%s',
`micro` = '%s',
`rel` = %d,
`name-date` = '%s',
`uri-date` = '%s',
`avatar-date` = '%s',
`blocked` = 0,
`pending` = 0,
`duplex` = %d,
`network` = 'dfrn' WHERE `id` = %d LIMIT 1
",
dbesc($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
$r = q("SELECT * FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
WHERE `contact`.`id` = %d LIMIT 1",
intval($dfrn_record)
);
if((count($r)) && ($r[0]['notify-flags'] & NOTIFY_CONFIRM)) {
$tpl = (($new_relation == REL_BUD)
? load_view_file('view/friend_complete_eml.tpl')
: load_view_file('view/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'], t("Connection accepted at ") . $a->config['sitename'],
$email_tpl, 'From: ' . t('Administrator') . '@' . $_SERVER['SERVER_NAME'] );
if(!$res) {
// pointless throwing an error here and confusing the person at the other end of the wire.
}
}
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($a->get_baseurl());
// NOTREACHED
}