411 lines
10 KiB
PHP
411 lines
10 KiB
PHP
<?php
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namespace Zotlabs\Web;
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/**
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* @brief Implements HTTP Signatures per draft-cavage-http-signatures-07.
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*
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* @see https://tools.ietf.org/html/draft-cavage-http-signatures-07
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*/
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class HTTPSig {
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/**
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* @brief RFC5843
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*
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* @see https://tools.ietf.org/html/rfc5843
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*
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* @param string $body The value to create the digest for
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* @param boolean $set (optional, default true)
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* If set send a Digest HTTP header
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* @return string The generated digest of $body
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*/
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static function generate_digest($body, $set = true) {
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$digest = base64_encode(hash('sha256', $body, true));
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if($set) {
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header('Digest: SHA-256=' . $digest);
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}
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return $digest;
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}
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// See draft-cavage-http-signatures-08
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static function verify($data,$key = '') {
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$body = $data;
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$headers = null;
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$spoofable = false;
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$result = [
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'signer' => '',
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'header_signed' => false,
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'header_valid' => false,
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'content_signed' => false,
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'content_valid' => false
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];
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// decide if $data arrived via controller submission or curl
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if(is_array($data) && $data['header']) {
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if(! $data['success'])
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return $result;
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$h = new \Zotlabs\Web\HTTPHeaders($data['header']);
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$headers = $h->fetcharr();
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$body = $data['body'];
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$headers['(request-target)'] = $data['request_target'];
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}
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else {
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$headers = [];
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$headers['(request-target)'] =
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strtolower($_SERVER['REQUEST_METHOD']) . ' ' .
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$_SERVER['REQUEST_URI'];
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$headers['content-type'] = $_SERVER['CONTENT_TYPE'];
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$headers['content-length'] = $_SERVER['CONTENT_LENGTH'];
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foreach($_SERVER as $k => $v) {
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if(strpos($k,'HTTP_') === 0) {
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$field = str_replace('_','-',strtolower(substr($k,5)));
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$headers[$field] = $v;
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}
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}
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}
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// logger('SERVER: ' . print_r($_SERVER,true), LOGGER_ALL);
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// logger('headers: ' . print_r($headers,true), LOGGER_ALL);
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$sig_block = null;
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if(array_key_exists('signature',$headers)) {
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$sig_block = self::parse_sigheader($headers['signature']);
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}
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elseif(array_key_exists('authorization',$headers)) {
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$sig_block = self::parse_sigheader($headers['authorization']);
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}
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if(! $sig_block) {
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logger('no signature provided.');
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return $result;
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}
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// Warning: This log statement includes binary data
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// logger('sig_block: ' . print_r($sig_block,true), LOGGER_DATA);
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$result['header_signed'] = true;
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$signed_headers = $sig_block['headers'];
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if(! $signed_headers)
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$signed_headers = [ 'date' ];
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$signed_data = '';
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foreach($signed_headers as $h) {
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if(array_key_exists($h,$headers)) {
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$signed_data .= $h . ': ' . $headers[$h] . "\n";
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}
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if(strpos($h,'.')) {
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$spoofable = true;
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}
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if($h === 'date') {
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$d = new \DateTime($headers[$h]);
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$d->setTimeZone(new \DateTimeZone('UTC'));
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$dplus = datetime_convert('UTC','UTC','now + 1 day');
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$dminus = datetime_convert('UTC','UTC','now - 1 day');
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$c = $d->format('Y-m-d H:i:s');
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if($c > $dplus || $c < $dminus) {
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logger('bad time: ' . $c);
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return $result;
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}
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}
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}
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$signed_data = rtrim($signed_data,"\n");
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$algorithm = null;
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if($sig_block['algorithm'] === 'rsa-sha256') {
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$algorithm = 'sha256';
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}
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if($sig_block['algorithm'] === 'rsa-sha512') {
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$algorithm = 'sha512';
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}
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if($key && function_exists($key)) {
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$result['signer'] = $sig_block['keyId'];
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$key = $key($sig_block['keyId']);
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}
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if(! $key) {
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$result['signer'] = $sig_block['keyId'];
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$key = self::get_activitypub_key($sig_block['keyId']);
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}
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if(! $key)
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return $result;
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$x = rsa_verify($signed_data,$sig_block['signature'],$key,$algorithm);
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logger('verified: ' . $x, LOGGER_DEBUG);
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if(! $x)
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return $result;
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if(! $spoofable)
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$result['header_valid'] = true;
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if(in_array('digest',$signed_headers)) {
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$result['content_signed'] = true;
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$digest = explode('=', $headers['digest']);
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if($digest[0] === 'SHA-256')
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$hashalg = 'sha256';
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if($digest[0] === 'SHA-512')
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$hashalg = 'sha512';
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// The explode operation will have stripped the '=' padding, so compare against unpadded base64
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if(rtrim(base64_encode(hash($hashalg,$body,true)),'=') === $digest[1]) {
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$result['content_valid'] = true;
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}
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}
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if(in_array('x-zot-digest',$signed_headers)) {
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$result['content_signed'] = true;
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$digest = explode('=', $headers['x-zot-digest']);
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if($digest[0] === 'SHA-256')
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$hashalg = 'sha256';
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if($digest[0] === 'SHA-512')
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$hashalg = 'sha512';
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// The explode operation will have stripped the '=' padding, so compare against unpadded base64
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if(rtrim(base64_encode(hash($hashalg,$_POST['data'],true)),'=') === $digest[1]) {
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$result['content_valid'] = true;
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}
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}
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logger('Content_Valid: ' . (($result['content_valid']) ? 'true' : 'false'));
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return $result;
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}
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/**
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* @brief
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*
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* @param string $id
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* @return boolean|string
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* false if no pub key found, otherwise return the pub key
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*/
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function get_activitypub_key($id) {
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if(strpos($id,'acct:') === 0) {
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$x = q("select xchan_pubkey from xchan left join hubloc on xchan_hash = hubloc_hash where hubloc_addr = '%s' limit 1",
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dbesc(str_replace('acct:','',$id))
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);
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}
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else {
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$x = q("select xchan_pubkey from xchan where xchan_hash = '%s' and xchan_network = 'activitypub' ",
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dbesc($id)
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);
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}
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if($x && $x[0]['xchan_pubkey']) {
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return ($x[0]['xchan_pubkey']);
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}
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if(function_exists('as_fetch'))
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$r = as_fetch($id);
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if($r) {
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$j = json_decode($r,true);
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if(array_key_exists('publicKey',$j) && array_key_exists('publicKeyPem',$j['publicKey'])) {
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if((array_key_exists('id',$j['publicKey']) && $j['publicKey']['id'] !== $id) && $j['id'] !== $id)
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return false;
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return($j['publicKey']['publicKeyPem']);
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}
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}
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return false;
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}
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/**
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* @brief
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*
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* @param string $request
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* @param array $head
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* @param string $prvkey
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* @param string $keyid (optional, default 'Key')
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* @param boolean $send_headers (optional, default false)
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* If set send a HTTP header
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* @param boolean $auth (optional, default false)
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* @param string $alg (optional, default 'sha256')
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* @param string $crypt_key (optional, default null)
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* @param string $crypt_algo (optional, default 'aes256ctr')
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* @return array
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*/
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static function create_sig($request, $head, $prvkey, $keyid = 'Key', $send_headers = false, $auth = false,
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$alg = 'sha256', $crypt_key = null, $crypt_algo = 'aes256ctr') {
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$return_headers = [];
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if($alg === 'sha256') {
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$algorithm = 'rsa-sha256';
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}
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if($alg === 'sha512') {
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$algorithm = 'rsa-sha512';
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}
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$x = self::sign($request,$head,$prvkey,$alg);
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$headerval = 'keyId="' . $keyid . '",algorithm="' . $algorithm
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. '",headers="' . $x['headers'] . '",signature="' . $x['signature'] . '"';
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if($crypt_key) {
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$x = crypto_encapsulate($headerval,$crypt_key,$crypt_algo);
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$headerval = 'iv="' . $x['iv'] . '",key="' . $x['key'] . '",alg="' . $x['alg'] . '",data="' . $x['data'] . '"';
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}
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if($auth) {
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$sighead = 'Authorization: Signature ' . $headerval;
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}
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else {
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$sighead = 'Signature: ' . $headerval;
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}
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if($head) {
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foreach($head as $k => $v) {
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if($send_headers) {
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header($k . ': ' . $v);
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}
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else {
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$return_headers[] = $k . ': ' . $v;
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}
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}
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}
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if($send_headers) {
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header($sighead);
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}
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else {
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$return_headers[] = $sighead;
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}
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return $return_headers;
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}
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/**
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* @brief
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*
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* @param string $request
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* @param array $head
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* @param string $prvkey
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* @param string $alg (optional) default 'sha256'
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* @return array
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*/
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static function sign($request, $head, $prvkey, $alg = 'sha256') {
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$ret = [];
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$headers = '';
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$fields = '';
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if($request) {
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$headers = '(request-target)' . ': ' . trim($request) . "\n";
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$fields = '(request-target)';
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}
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if($head) {
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foreach($head as $k => $v) {
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$headers .= strtolower($k) . ': ' . trim($v) . "\n";
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if($fields)
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$fields .= ' ';
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$fields .= strtolower($k);
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}
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// strip the trailing linefeed
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$headers = rtrim($headers,"\n");
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}
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$sig = base64_encode(rsa_sign($headers,$prvkey,$alg));
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$ret['headers'] = $fields;
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$ret['signature'] = $sig;
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return $ret;
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}
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/**
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* @brief
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*
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* @param string $header
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* @return array associate array with
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* - \e string \b keyID
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* - \e string \b algorithm
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* - \e array \b headers
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* - \e string \b signature
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*/
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static function parse_sigheader($header) {
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if(is_array($header)) {
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btlogger('is_array: ' . print_r($header,true));
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}
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$ret = [];
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$matches = [];
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// if the header is encrypted, decrypt with (default) site private key and continue
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if(preg_match('/iv="(.*?)"/ism',$header,$matches))
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$header = self::decrypt_sigheader($header);
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if(preg_match('/keyId="(.*?)"/ism',$header,$matches))
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$ret['keyId'] = $matches[1];
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if(preg_match('/algorithm="(.*?)"/ism',$header,$matches))
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$ret['algorithm'] = $matches[1];
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if(preg_match('/headers="(.*?)"/ism',$header,$matches))
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$ret['headers'] = explode(' ', $matches[1]);
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if(preg_match('/signature="(.*?)"/ism',$header,$matches))
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$ret['signature'] = base64_decode(preg_replace('/\s+/','',$matches[1]));
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if(($ret['signature']) && ($ret['algorithm']) && (! $ret['headers']))
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$ret['headers'] = [ 'date' ];
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return $ret;
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}
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/**
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* @brief
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*
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* @param string $header
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* @param string $prvkey (optional), if not set use site private key
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* @return array|string associative array, empty string if failue
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* - \e string \b iv
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* - \e string \b key
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* - \e string \b alg
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* - \e string \b data
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*/
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static function decrypt_sigheader($header, $prvkey = null) {
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$iv = $key = $alg = $data = null;
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if(! $prvkey) {
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$prvkey = get_config('system', 'prvkey');
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}
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$matches = [];
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if(preg_match('/iv="(.*?)"/ism',$header,$matches))
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$iv = $matches[1];
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if(preg_match('/key="(.*?)"/ism',$header,$matches))
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$key = $matches[1];
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if(preg_match('/alg="(.*?)"/ism',$header,$matches))
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$alg = $matches[1];
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if(preg_match('/data="(.*?)"/ism',$header,$matches))
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$data = $matches[1];
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if($iv && $key && $alg && $data) {
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return crypto_unencapsulate([ 'encrypted' => true, 'iv' => $iv, 'key' => $key, 'alg' => $alg, 'data' => $data ] , $prvkey);
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}
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return '';
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}
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}
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