friendica_2021-01/mod/dfrn_notify.php

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<?php
require_once('library/simplepie/simplepie.inc');
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require_once('include/items.php');
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require_once('include/event.php');
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function dfrn_notify_post(&$a) {
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$dfrn_id = ((x($_POST,'dfrn_id')) ? notags(trim($_POST['dfrn_id'])) : '');
$dfrn_version = ((x($_POST,'dfrn_version')) ? (float) $_POST['dfrn_version'] : 2.0);
$challenge = ((x($_POST,'challenge')) ? notags(trim($_POST['challenge'])) : '');
$data = ((x($_POST,'data')) ? $_POST['data'] : '');
$key = ((x($_POST,'key')) ? $_POST['key'] : '');
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$dissolve = ((x($_POST,'dissolve')) ? intval($_POST['dissolve']) : 0);
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$perm = ((x($_POST,'perm')) ? notags(trim($_POST['perm'])) : 'r');
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$ssl_policy = ((x($_POST,'ssl_policy')) ? notags(trim($_POST['ssl_policy'])): 'none');
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$writable = (-1);
if($dfrn_version >= 2.21) {
$writable = (($perm === 'rw') ? 1 : 0);
}
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$direction = (-1);
if(strpos($dfrn_id,':') == 1) {
$direction = intval(substr($dfrn_id,0,1));
$dfrn_id = substr($dfrn_id,2);
}
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$r = q("SELECT * FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
dbesc($dfrn_id),
dbesc($challenge)
);
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if(! count($r)) {
logger('dfrn_notify: could not match challenge to dfrn_id ' . $dfrn_id . ' challenge=' . $challenge);
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xml_status(3);
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}
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$r = q("DELETE FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
dbesc($dfrn_id),
dbesc($challenge)
);
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// find the local user who owns this relationship.
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$sql_extra = '';
switch($direction) {
case (-1):
$sql_extra = sprintf(" AND ( `issued-id` = '%s' OR `dfrn-id` = '%s' ) ", dbesc($dfrn_id), dbesc($dfrn_id));
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break;
case 0:
$sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
break;
case 1:
$sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
break;
default:
xml_status(3);
break; // NOTREACHED
}
// be careful - $importer will contain both the contact information for the contact
// sending us the post, and also the user information for the person receiving it.
// since they are mixed together, it is easy to get them confused.
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$r = q("SELECT `contact`.*, `contact`.`uid` AS `importer_uid`,
`contact`.`pubkey` AS `cpubkey`,
`contact`.`prvkey` AS `cprvkey`,
`contact`.`thumb` AS `thumb`,
`contact`.`url` as `url`,
`contact`.`name` as `senderName`,
`user`.*
FROM `contact`
LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
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AND `user`.`nickname` = '%s' AND `user`.`account_expired` = 0 $sql_extra LIMIT 1",
dbesc($a->argv[1])
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);
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if(! count($r)) {
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logger('dfrn_notify: contact not found for dfrn_id ' . $dfrn_id);
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xml_status(3);
//NOTREACHED
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}
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// $importer in this case contains the contact record for the remote contact joined with the user record of our user.
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$importer = $r[0];
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if(($writable != (-1)) && ($writable != $importer['writable'])) {
q("UPDATE `contact` SET `writable` = %d WHERE `id` = %d LIMIT 1",
intval($writable),
intval($importer['id'])
);
$importer['writable'] = $writable;
}
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// if contact's ssl policy changed, update our links
$ssl_changed = false;
if($ssl_policy == 'self' && strstr($importer['url'],'https:')) {
$ssl_changed = true;
$importer['url'] = str_replace('https:','http:',$importer['url']);
$importer['nurl'] = normalise_link($importer['url']);
$importer['photo'] = str_replace('https:','http:',$importer['photo']);
$importer['thumb'] = str_replace('https:','http:',$importer['thumb']);
$importer['micro'] = str_replace('https:','http:',$importer['micro']);
$importer['request'] = str_replace('https:','http:',$importer['request']);
$importer['notify'] = str_replace('https:','http:',$importer['notify']);
$importer['poll'] = str_replace('https:','http:',$importer['poll']);
$importer['confirm'] = str_replace('https:','http:',$importer['confirm']);
$importer['poco'] = str_replace('https:','http:',$importer['poco']);
}
if($ssl_policy == 'full' && strstr($importer['url'],'http:')) {
$ssl_changed = true;
$importer['url'] = str_replace('http:','https:',$importer['url']);
$importer['nurl'] = normalise_link($importer['url']);
$importer['photo'] = str_replace('http:','https:',$importer['photo']);
$importer['thumb'] = str_replace('http:','https:',$importer['thumb']);
$importer['micro'] = str_replace('http:','https:',$importer['micro']);
$importer['request'] = str_replace('http:','https:',$importer['request']);
$importer['notify'] = str_replace('http:','https:',$importer['notify']);
$importer['poll'] = str_replace('http:','https:',$importer['poll']);
$importer['confirm'] = str_replace('http:','https:',$importer['confirm']);
$importer['poco'] = str_replace('http:','https:',$importer['poco']);
}
if($ssl_changed) {
q("update contact set
url = '%s',
nurl = '%s',
photo = '%s',
thumb = '%s',
micro = '%s',
request = '%s',
notify = '%s',
poll = '%s',
confirm = '%s',
poco = '%s'
where id = %d limit 1",
dbesc($importer['url']),
dbesc($importer['nurl']),
dbesc($importer['photo']),
dbesc($importer['thumb']),
dbesc($importer['micro']),
dbesc($importer['request']),
dbesc($importer['notify']),
dbesc($importer['poll']),
dbesc($importer['confirm']),
dbesc($importer['poco']),
intval($importer['id'])
);
}
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logger('dfrn_notify: received notify from ' . $importer['name'] . ' for ' . $importer['username']);
logger('dfrn_notify: data: ' . $data, LOGGER_DATA);
if($dissolve == 1) {
/**
* Relationship is dissolved permanently
*/
require_once('include/Contact.php');
contact_remove($importer['id']);
logger('relationship dissolved : ' . $importer['name'] . ' dissolved ' . $importer['username']);
xml_status(0);
}
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if(strlen($key)) {
$rawkey = hex2bin(trim($key));
logger('rino: md5 raw key: ' . md5($rawkey));
$final_key = '';
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if($dfrn_version >= 2.1) {
if((($importer['duplex']) && strlen($importer['cprvkey'])) || (! strlen($importer['cpubkey']))) {
openssl_private_decrypt($rawkey,$final_key,$importer['cprvkey']);
}
else {
openssl_public_decrypt($rawkey,$final_key,$importer['cpubkey']);
}
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}
else {
if((($importer['duplex']) && strlen($importer['cpubkey'])) || (! strlen($importer['cprvkey']))) {
openssl_public_decrypt($rawkey,$final_key,$importer['cpubkey']);
}
else {
openssl_private_decrypt($rawkey,$final_key,$importer['cprvkey']);
}
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}
logger('rino: received key : ' . $final_key);
$data = aes_decrypt(hex2bin($data),$final_key);
logger('rino: decrypted data: ' . $data, LOGGER_DATA);
}
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$ret = local_delivery($importer,$data);
xml_status($ret);
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// NOTREACHED
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}
function dfrn_notify_content(&$a) {
if(x($_GET,'dfrn_id')) {
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// initial communication from external contact, $direction is their direction.
// If this is a duplex communication, ours will be the opposite.
$dfrn_id = notags(trim($_GET['dfrn_id']));
$dfrn_version = (float) $_GET['dfrn_version'];
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logger('dfrn_notify: new notification dfrn_id=' . $dfrn_id);
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$direction = (-1);
if(strpos($dfrn_id,':') == 1) {
$direction = intval(substr($dfrn_id,0,1));
$dfrn_id = substr($dfrn_id,2);
}
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$hash = random_string();
$status = 0;
$r = q("DELETE FROM `challenge` WHERE `expire` < " . intval(time()));
$r = q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` )
VALUES( '%s', '%s', %d ) ",
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dbesc($hash),
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dbesc($dfrn_id),
intval(time() + 90 )
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);
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logger('dfrn_notify: challenge=' . $hash, LOGGER_DEBUG );
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$sql_extra = '';
switch($direction) {
case (-1):
$sql_extra = sprintf(" AND ( `issued-id` = '%s' OR `dfrn-id` = '%s' ) ", dbesc($dfrn_id), dbesc($dfrn_id));
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$my_id = $dfrn_id;
break;
case 0:
$sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
$my_id = '1:' . $dfrn_id;
break;
case 1:
$sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
$my_id = '0:' . $dfrn_id;
break;
default:
$status = 1;
break; // NOTREACHED
}
$r = q("SELECT `contact`.*, `user`.`nickname` FROM `contact` LEFT JOIN `user` ON `user`.`uid` = `contact`.`uid`
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WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0 AND `user`.`nickname` = '%s'
AND `user`.`account_expired` = 0 $sql_extra LIMIT 1",
dbesc($a->argv[1])
);
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if(! count($r))
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$status = 1;
$challenge = '';
$encrypted_id = '';
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$id_str = $my_id . '.' . mt_rand(1000,9999);
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$prv_key = trim($r[0]['prvkey']);
$pub_key = trim($r[0]['pubkey']);
$dplx = intval($r[0]['duplex']);
if((($dplx) && (strlen($prv_key))) || ((strlen($prv_key)) && (!(strlen($pub_key))))) {
openssl_private_encrypt($hash,$challenge,$prv_key);
openssl_private_encrypt($id_str,$encrypted_id,$prv_key);
}
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elseif(strlen($pub_key)) {
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openssl_public_encrypt($hash,$challenge,$pub_key);
openssl_public_encrypt($id_str,$encrypted_id,$pub_key);
}
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else
$status = 1;
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$challenge = bin2hex($challenge);
$encrypted_id = bin2hex($encrypted_id);
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$rino = ((function_exists('mcrypt_encrypt')) ? 1 : 0);
$rino_enable = get_config('system','rino_encrypt');
if(! $rino_enable)
$rino = 0;
header("Content-type: text/xml");
echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n"
. '<dfrn_notify>' . "\r\n"
. "\t" . '<status>' . $status . '</status>' . "\r\n"
. "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n"
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. "\t" . '<rino>' . $rino . '</rino>' . "\r\n"
. "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n"
. "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n"
. '</dfrn_notify>' . "\r\n" ;
killme();
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}
}