143 lines
3.3 KiB
PHP
143 lines
3.3 KiB
PHP
<?php
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require_once('library/asn1.php');
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function salmon_key($pubkey) {
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$lines = explode("\n",$pubkey);
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unset($lines[0]);
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unset($lines[count($lines)]);
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$x = base64_decode(implode('',$lines));
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$r = ASN_BASE::parseASNString($x);
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$m = $r[0]->asnData[1]->asnData[0]->asnData[0]->asnData;
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$e = $r[0]->asnData[1]->asnData[0]->asnData[1]->asnData;
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return 'RSA' . '.' . $m . '.' . $e ;
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}
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function base64url_encode($s) {
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return strtr(base64_encode($s),'+/','-_');
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}
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function base64url_decode($s) {
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return base64_decode(strtr($s,'-_','+/'));
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}
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function get_salmon_key($uri,$keyhash) {
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$ret = array();
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$debugging = get_config('system','debugging');
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if($debugging)
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file_put_contents('salmon.out', "\n" . 'Fetch key' . "\n", FILE_APPEND);
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if(strstr($uri,'@')) {
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$arr = webfinger($uri);
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if($debugging)
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file_put_contents('salmon.out', "\n" . 'Fetch key from webfinger' . "\n", FILE_APPEND);
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}
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else {
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$html = fetch_url($uri);
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$a = get_app();
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$h = $a->get_curl_headers();
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if($debugging)
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file_put_contents('salmon.out', "\n" . 'Fetch key via HTTP header: ' . $h . "\n", FILE_APPEND);
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$l = explode("\n",$h);
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if(count($l)) {
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foreach($l as $line) {
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// TODO alter the following regex to support multiple relations (space separated)
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if((stristr($line,'link:')) && preg_match('/<([^>].*)>.*rel\=[\'\"]lrdd[\'\"]/',$line,$matches)) {
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$link = $matches[1];
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if($debugging)
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file_put_contents('salmon.out', "\n" . 'Fetch key via HTML Link: ' . $link . "\n", FILE_APPEND);
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break;
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}
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}
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}
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if(! isset($link)) {
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// parse the page of the supplied URL looking for rel links
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require_once('library/HTML5/Parser.php');
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$dom = HTML5_Parser::parse($html);
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if(! $dom)
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return '';
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$items = $dom->getElementsByTagName('link');
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foreach($items as $item) {
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$x = $item->getAttribute('rel');
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if($x == "lrdd") {
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$link = $item->getAttribute('href');
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if($debugging)
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file_put_contents('salmon.out', "\n" . 'Fetch key via HTML body' . $link . "\n", FILE_APPEND);
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break;
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}
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}
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}
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if(! isset($link))
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return '';
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$arr = fetch_xrd_links($link);
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}
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if($arr) {
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foreach($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[$x],5);
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}
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else
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$ret[$x] = fetch_url($ret[$x]);
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}
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}
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if($debugging)
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file_put_contents('salmon.out', "\n" . 'Key located: ' . print_r($ret,true) . "\n", FILE_APPEND);
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if(count($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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