mirror of
https://github.com/friendica/friendica
synced 2024-05-25 01:44:59 +02:00
177 lines
4.3 KiB
PHP
177 lines
4.3 KiB
PHP
<?php
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require_once('include/crypto.php');
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require_once('include/Probe.php');
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function get_salmon_key($uri,$keyhash) {
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$ret = array();
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logger('Fetching salmon key for '.$uri);
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$arr = Probe::lrdd($uri);
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if(is_array($arr)) {
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foreach($arr as $a) {
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if($a['@attributes']['rel'] === 'magic-public-key') {
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$ret[] = $a['@attributes']['href'];
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}
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}
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}
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else {
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return '';
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}
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// We have found at least one key URL
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// If it's inline, parse it - otherwise get the key
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if(count($ret)) {
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for($x = 0; $x < count($ret); $x ++) {
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if(substr($ret[$x],0,5) === 'data:') {
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if(strstr($ret[$x],','))
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$ret[$x] = substr($ret[$x],strpos($ret[$x],',')+1);
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else
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$ret[$x] = substr($ret[$x],5);
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} elseif (normalise_link($ret[$x]) == 'http://')
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$ret[$x] = fetch_url($ret[$x]);
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}
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}
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logger('Key located: ' . print_r($ret,true));
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if(count($ret) == 1) {
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// We only found one one key so we don't care if the hash matches.
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// If it's the wrong key we'll find out soon enough because
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// message verification will fail. This also covers some older
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// software which don't supply a keyhash. As long as they only
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// have one key we'll be right.
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return $ret[0];
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}
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else {
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foreach($ret as $a) {
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$hash = base64url_encode(hash('sha256',$a));
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if($hash == $keyhash)
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return $a;
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}
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}
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return '';
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}
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function slapper($owner,$url,$slap) {
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// does contact have a salmon endpoint?
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if(! strlen($url))
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return;
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if(! $owner['sprvkey']) {
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logger(sprintf("user '%s' (%d) does not have a salmon private key. Send failed.",
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$owner['username'],$owner['uid']));
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return;
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}
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logger('slapper called for '.$url.'. Data: ' . $slap);
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// create a magic envelope
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$data = base64url_encode($slap);
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$data_type = 'application/atom+xml';
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$encoding = 'base64url';
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$algorithm = 'RSA-SHA256';
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$keyhash = base64url_encode(hash('sha256',salmon_key($owner['spubkey'])),true);
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// precomputed base64url encoding of data_type, encoding, algorithm concatenated with periods
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$precomputed = '.YXBwbGljYXRpb24vYXRvbSt4bWw=.YmFzZTY0dXJs.UlNBLVNIQTI1Ng==';
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$signature = base64url_encode(rsa_sign(str_replace('=','',$data . $precomputed),$owner['sprvkey']));
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$signature2 = base64url_encode(rsa_sign($data . $precomputed,$owner['sprvkey']));
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$signature3 = base64url_encode(rsa_sign($data,$owner['sprvkey']));
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$salmon_tpl = get_markup_template('magicsig.tpl');
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$salmon = replace_macros($salmon_tpl,array(
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'$data' => $data,
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'$encoding' => $encoding,
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'$algorithm' => $algorithm,
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'$keyhash' => $keyhash,
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'$signature' => $signature
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));
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// slap them
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post_url($url,$salmon, array(
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'Content-type: application/magic-envelope+xml',
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'Content-length: ' . strlen($salmon)
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));
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$a = get_app();
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$return_code = $a->get_curl_code();
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// check for success, e.g. 2xx
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if($return_code > 299) {
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logger('compliant salmon failed. Falling back to status.net hack2');
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// Entirely likely that their salmon implementation is
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// non-compliant. Let's try once more, this time only signing
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// the data, without stripping '=' chars
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$salmon = replace_macros($salmon_tpl,array(
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'$data' => $data,
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'$encoding' => $encoding,
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'$algorithm' => $algorithm,
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'$keyhash' => $keyhash,
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'$signature' => $signature2
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));
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// slap them
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post_url($url,$salmon, array(
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'Content-type: application/magic-envelope+xml',
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'Content-length: ' . strlen($salmon)
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));
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$return_code = $a->get_curl_code();
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if($return_code > 299) {
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logger('compliant salmon failed. Falling back to status.net hack3');
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// Entirely likely that their salmon implementation is
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// non-compliant. Let's try once more, this time only signing
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// the data, without the precomputed blob
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$salmon = replace_macros($salmon_tpl,array(
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'$data' => $data,
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'$encoding' => $encoding,
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'$algorithm' => $algorithm,
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'$keyhash' => $keyhash,
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'$signature' => $signature3
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));
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// slap them
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post_url($url,$salmon, array(
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'Content-type: application/magic-envelope+xml',
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'Content-length: ' . strlen($salmon)
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));
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$return_code = $a->get_curl_code();
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}
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}
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logger('slapper for '.$url.' returned ' . $return_code);
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if(! $return_code)
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return(-1);
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if(($return_code == 503) && (stristr($a->get_curl_headers(),'retry-after')))
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return(-1);
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return ((($return_code >= 200) && ($return_code < 300)) ? 0 : 1);
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}
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