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Relocated AP signature functions, reduced magic auth functions

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This commit is contained in:
Michael 2018-09-20 18:16:14 +00:00
parent 0866fbaf8c
commit 11310f4cf0
6 changed files with 192 additions and 309 deletions
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3
src/Module/Inbox.php
View file

@ -8,6 +8,7 @@ use Friendica\BaseModule;
use Friendica\Protocol\ActivityPub;
use Friendica\Core\System;
use Friendica\Database\DBA;
use Friendica\Util\HTTPSignature;
/**
* ActivityPub Inbox
@ -24,7 +25,7 @@ class Inbox extends BaseModule
System::httpExit(400);
}
if (ActivityPub::verifySignature($postdata, $_SERVER)) {
if (HTTPSignature::verifyAP($postdata, $_SERVER)) {
$filename = 'signed-activitypub';
} else {
$filename = 'failed-activitypub';

6
src/Module/Magic.php
View file

@ -76,13 +76,9 @@ class Magic extends BaseModule
// Create a header that is signed with the local users private key.
$headers = HTTPSignature::createSig(
'',
$headers,
$user['prvkey'],
'acct:' . $user['nickname'] . '@' . $a->get_hostname() . ($a->urlpath ? '/' . $a->urlpath : ''),
false,
true,
'sha512'
'acct:' . $user['nickname'] . '@' . $a->get_hostname() . ($a->urlpath ? '/' . $a->urlpath : '')
);
// Try to get an authentication token from the other instance.

2
src/Module/Owa.php
View file

@ -54,7 +54,7 @@ class Owa extends BaseModule
if (DBA::isResult($contact)) {
// Try to verify the signed header with the public key of the contact record
// we have found.
$verified = HTTPSignature::verify('', $contact['pubkey']);
$verified = HTTPSignature:verifyMagic($contact['pubkey']);
if ($verified && $verified['header_signed'] && $verified['header_valid']) {
logger('OWA header: ' . print_r($verified, true), LOGGER_DATA);

196
src/Protocol/ActivityPub.php
View file

@ -63,38 +63,6 @@ class ActivityPub
stristr(defaults($_SERVER, 'HTTP_ACCEPT', ''), 'application/ld+json');
}
public static function transmit($data, $target, $uid)
{
$owner = User::getOwnerDataById($uid);
if (!$owner) {
return;
}
$content = json_encode($data);
// Header data that is about to be signed.
$host = parse_url($target, PHP_URL_HOST);
$path = parse_url($target, PHP_URL_PATH);
$digest = 'SHA-256=' . base64_encode(hash('sha256', $content, true));
$content_length = strlen($content);
$headers = ['Content-Length: ' . $content_length, 'Digest: ' . $digest, 'Host: ' . $host];
$signed_data = "(request-target): post " . $path . "\ncontent-length: " . $content_length . "\ndigest: " . $digest . "\nhost: " . $host;
$signature = base64_encode(Crypto::rsaSign($signed_data, $owner['uprvkey'], 'sha256'));
$headers[] = 'Signature: keyId="' . $owner['url'] . '#main-key' . '",algorithm="rsa-sha256",headers="(request-target) content-length digest host",signature="' . $signature . '"';
$headers[] = 'Content-Type: application/activity+json';
Network::post($target, $content, $headers);
$return_code = BaseObject::getApp()->get_curl_code();
logger('Transmit to ' . $target . ' returned ' . $return_code);
}
/**
* Return the ActivityPub profile of the given user
*
@ -401,7 +369,7 @@ class ActivityPub
'to' => $profile['url']];
logger('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, LOGGER_DEBUG);
return self::transmit($data, $profile['inbox'], $uid);
return HTTPSignature::transmit($data, $profile['inbox'], $uid);
}
public static function transmitContactAccept($target, $id, $uid)
@ -419,7 +387,7 @@ class ActivityPub
'to' => $profile['url']];
logger('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
return self::transmit($data, $profile['inbox'], $uid);
return HTTPSignature::transmit($data, $profile['inbox'], $uid);
}
public static function transmitContactReject($target, $id, $uid)
@ -437,7 +405,7 @@ class ActivityPub
'to' => $profile['url']];
logger('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
return self::transmit($data, $profile['inbox'], $uid);
return HTTPSignature::transmit($data, $profile['inbox'], $uid);
}
public static function transmitContactUndo($target, $uid)
@ -457,7 +425,7 @@ class ActivityPub
'to' => $profile['url']];
logger('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
return self::transmit($data, $profile['inbox'], $uid);
return HTTPSignature::transmit($data, $profile['inbox'], $uid);
}
/**
@ -515,154 +483,6 @@ class ActivityPub
return false;
}
public static function verifySignature($content, $http_headers)
{
$object = json_decode($content, true);
if (empty($object)) {
return false;
}
$actor = JsonLD::fetchElement($object, 'actor', 'id');
$headers = [];
$headers['(request-target)'] = strtolower($http_headers['REQUEST_METHOD']) . ' ' . $http_headers['REQUEST_URI'];
// First take every header
foreach ($http_headers as $k => $v) {
$field = str_replace('_', '-', strtolower($k));
$headers[$field] = $v;
}
// Now add every http header
foreach ($http_headers as $k => $v) {
if (strpos($k, 'HTTP_') === 0) {
$field = str_replace('_', '-', strtolower(substr($k, 5)));
$headers[$field] = $v;
}
}
$sig_block = ActivityPub::parseSigHeader($http_headers['HTTP_SIGNATURE']);
if (empty($sig_block) || empty($sig_block['headers']) || empty($sig_block['keyId'])) {
return false;
}
$signed_data = '';
foreach ($sig_block['headers'] as $h) {
if (array_key_exists($h, $headers)) {
$signed_data .= $h . ': ' . $headers[$h] . "\n";
}
}
$signed_data = rtrim($signed_data, "\n");
if (empty($signed_data)) {
return false;
}
$algorithm = null;
if ($sig_block['algorithm'] === 'rsa-sha256') {
$algorithm = 'sha256';
}
if ($sig_block['algorithm'] === 'rsa-sha512') {
$algorithm = 'sha512';
}
if (empty($algorithm)) {
return false;
}
$key = self::fetchKey($sig_block['keyId'], $actor);
if (empty($key)) {
return false;
}
if (!Crypto::rsaVerify($signed_data, $sig_block['signature'], $key, $algorithm)) {
return false;
}
// Check the digest when it is part of the signed data
if (in_array('digest', $sig_block['headers'])) {
$digest = explode('=', $headers['digest'], 2);
if ($digest[0] === 'SHA-256') {
$hashalg = 'sha256';
}
if ($digest[0] === 'SHA-512') {
$hashalg = 'sha512';
}
/// @todo add all hashes from the rfc
if (!empty($hashalg) && base64_encode(hash($hashalg, $content, true)) != $digest[1]) {
return false;
}
}
// Check the content-length when it is part of the signed data
if (in_array('content-length', $sig_block['headers'])) {
if (strlen($content) != $headers['content-length']) {
return false;
}
}
return true;
}
private static function fetchKey($id, $actor)
{
$url = (strpos($id, '#') ? substr($id, 0, strpos($id, '#')) : $id);
$profile = self::fetchprofile($url);
if (!empty($profile)) {
return $profile['pubkey'];
} elseif ($url != $actor) {
$profile = self::fetchprofile($actor);
if (!empty($profile)) {
return $profile['pubkey'];
}
}
return false;
}
/**
* @brief
*
* @param string $header
* @return array associate array with
* - \e string \b keyID
* - \e string \b algorithm
* - \e array \b headers
* - \e string \b signature
*/
private static function parseSigHeader($header)
{
$ret = [];
$matches = [];
if (preg_match('/keyId="(.*?)"/ism',$header,$matches)) {
$ret['keyId'] = $matches[1];
}
if (preg_match('/algorithm="(.*?)"/ism',$header,$matches)) {
$ret['algorithm'] = $matches[1];
}
if (preg_match('/headers="(.*?)"/ism',$header,$matches)) {
$ret['headers'] = explode(' ', $matches[1]);
}
if (preg_match('/signature="(.*?)"/ism',$header,$matches)) {
$ret['signature'] = base64_decode(preg_replace('/\s+/','',$matches[1]));
}
return $ret;
}
public static function fetchprofile($url, $update = false)
{
if (empty($url)) {
@ -798,7 +618,7 @@ class ActivityPub
{
logger('Incoming message for user ' . $uid, LOGGER_DEBUG);
if (!self::verifySignature($body, $header)) {
if (!HTTPSignature::verifyAP($body, $header)) {
logger('Invalid signature, message will be discarded.', LOGGER_DEBUG);
return;
}
@ -813,7 +633,7 @@ class ActivityPub
self::processActivity($activity, $body, $uid);
}
public static function fetchOutbox($url)
public static function fetchOutbox($url, $uid)
{
$data = self::fetchContent($url);
if (empty($data)) {
@ -825,14 +645,14 @@ class ActivityPub
} elseif (!empty($data['first']['orderedItems'])) {
$items = $data['first']['orderedItems'];
} elseif (!empty($data['first'])) {
self::fetchOutbox($data['first']);
self::fetchOutbox($data['first'], $uid);
return;
} else {
$items = [];
}
foreach ($items as $activity) {
self::processActivity($activity);
self::processActivity($activity, '', $uid);
}
}

253
src/Util/HTTPSignature.php
View file

@ -5,8 +5,11 @@
*/
namespace Friendica\Util;
use Friendica\BaseObject;
use Friendica\Core\Config;
use Friendica\Database\DBA;
use Friendica\Model\User;
use Friendica\Protocol\ActivityPub;
/**
* @brief Implements HTTP Signatures per draft-cavage-http-signatures-07.
@ -19,29 +22,17 @@ use Friendica\Database\DBA;
class HTTPSignature
{
// See draft-cavage-http-signatures-08
public static function verify($data, $key = '')
public static function verifyMagic($key)
{
$body = $data;
$headers = null;
$spoofable = false;
$result = [
'signer' => '',
'header_signed' => false,
'header_valid' => false,
'content_signed' => false,
'content_valid' => false
'header_valid' => false
];
// Decide if $data arrived via controller submission or curl.
if (is_array($data) && $data['header']) {
if (!$data['success']) {
return $result;
}
$h = new HTTPHeaders($data['header']);
$headers = $h->fetch();
$body = $data['body'];
} else {
$headers = [];
$headers['(request-target)'] = strtolower($_SERVER['REQUEST_METHOD']).' '.$_SERVER['REQUEST_URI'];
@ -51,24 +42,16 @@ class HTTPSignature
$headers[$field] = $v;
}
}
}
$sig_block = null;
if (array_key_exists('signature', $headers)) {
$sig_block = self::parseSigheader($headers['signature']);
} elseif (array_key_exists('authorization', $headers)) {
$sig_block = self::parseSigheader($headers['authorization']);
}
if (!$sig_block) {
logger('no signature provided.');
return $result;
}
// Warning: This log statement includes binary data
// logger('sig_block: ' . print_r($sig_block,true), LOGGER_DATA);
$result['header_signed'] = true;
$signed_headers = $sig_block['headers'];
@ -88,13 +71,7 @@ class HTTPSignature
$signed_data = rtrim($signed_data, "\n");
$algorithm = null;
if ($sig_block['algorithm'] === 'rsa-sha256') {
$algorithm = 'sha256';
}
if ($sig_block['algorithm'] === 'rsa-sha512') {
$algorithm = 'sha512';
}
if ($key && function_exists($key)) {
$result['signer'] = $sig_block['keyId'];
@ -119,93 +96,39 @@ class HTTPSignature
$result['header_valid'] = true;
}
if (in_array('digest', $signed_headers)) {
$result['content_signed'] = true;
$digest = explode('=', $headers['digest']);
if ($digest[0] === 'SHA-256') {
$hashalg = 'sha256';
}
if ($digest[0] === 'SHA-512') {
$hashalg = 'sha512';
}
// The explode operation will have stripped the '=' padding, so compare against unpadded base64.
if (rtrim(base64_encode(hash($hashalg, $body, true)), '=') === $digest[1]) {
$result['content_valid'] = true;
}
}
logger('Content_Valid: ' . $result['content_valid']);
return $result;
}
/**
* @brief
*
* @param string $request
* @param array $head
* @param string $prvkey
* @param string $keyid (optional, default 'Key')
* @param boolean $send_headers (optional, default false)
* If set send a HTTP header
* @param boolean $auth (optional, default false)
* @param string $alg (optional, default 'sha256')
* @param string $crypt_key (optional, default null)
* @param string $crypt_algo (optional, default 'aes256ctr')
*
* @return array
*/
public static function createSig($request, $head, $prvkey, $keyid = 'Key', $send_headers = false, $auth = false, $alg = 'sha256', $crypt_key = null, $crypt_algo = 'aes256ctr')
public static function createSig($head, $prvkey, $keyid = 'Key')
{
$return_headers = [];
if ($alg === 'sha256') {
$algorithm = 'rsa-sha256';
}
if ($alg === 'sha512') {
$alg = 'sha512';
$algorithm = 'rsa-sha512';
}
$x = self::sign($request, $head, $prvkey, $alg);
$x = self::sign($head, $prvkey, $alg);
$headerval = 'keyId="' . $keyid . '",algorithm="' . $algorithm
. '",headers="' . $x['headers'] . '",signature="' . $x['signature'] . '"';
if ($crypt_key) {
$x = Crypto::encapsulate($headerval, $crypt_key, $crypt_algo);
$headerval = 'iv="' . $x['iv'] . '",key="' . $x['key'] . '",alg="' . $x['alg'] . '",data="' . $x['data'] . '"';
}
if ($auth) {
$sighead = 'Authorization: Signature ' . $headerval;
} else {
$sighead = 'Signature: ' . $headerval;
}
if ($head) {
foreach ($head as $k => $v) {
if ($send_headers) {
// This is for ActivityPub implementation.
// Since the Activity Pub implementation isn't
// ready at the moment, we comment it out.
// header($k . ': ' . $v);
} else {
$return_headers[] = $k . ': ' . $v;
}
}
}
if ($send_headers) {
// This is for ActivityPub implementation.
// Since the Activity Pub implementation isn't
// ready at the moment, we comment it out.
// header($sighead);
} else {
$return_headers[] = $sighead;
}
return $return_headers;
}
@ -213,25 +136,18 @@ class HTTPSignature
/**
* @brief
*
* @param string $request
* @param array $head
* @param string $prvkey
* @param string $alg (optional) default 'sha256'
*
* @return array
*/
private static function sign($request, $head, $prvkey, $alg = 'sha256')
private static function sign($head, $prvkey, $alg = 'sha256')
{
$ret = [];
$headers = '';
$fields = '';
if ($request) {
$headers = '(request-target)' . ': ' . trim($request) . "\n";
$fields = '(request-target)';
}
if ($head) {
foreach ($head as $k => $v) {
$headers .= strtolower($k) . ': ' . trim($v) . "\n";
if ($fields) {
@ -241,7 +157,6 @@ class HTTPSignature
}
// strip the trailing linefeed
$headers = rtrim($headers, "\n");
}
$sig = base64_encode(Crypto::rsaSign($headers, $prvkey, $alg));
@ -338,4 +253,154 @@ class HTTPSignature
return '';
}
/**
* Functions for ActivityPub
*/
public static function transmit($data, $target, $uid)
{
$owner = User::getOwnerDataById($uid);
if (!$owner) {
return;
}
$content = json_encode($data);
// Header data that is about to be signed.
$host = parse_url($target, PHP_URL_HOST);
$path = parse_url($target, PHP_URL_PATH);
$digest = 'SHA-256=' . base64_encode(hash('sha256', $content, true));
$content_length = strlen($content);
$headers = ['Content-Length: ' . $content_length, 'Digest: ' . $digest, 'Host: ' . $host];
$signed_data = "(request-target): post " . $path . "\ncontent-length: " . $content_length . "\ndigest: " . $digest . "\nhost: " . $host;
$signature = base64_encode(Crypto::rsaSign($signed_data, $owner['uprvkey'], 'sha256'));
$headers[] = 'Signature: keyId="' . $owner['url'] . '#main-key' . '",algorithm="rsa-sha256",headers="(request-target) content-length digest host",signature="' . $signature . '"';
$headers[] = 'Content-Type: application/activity+json';
Network::post($target, $content, $headers);
$return_code = BaseObject::getApp()->get_curl_code();
logger('Transmit to ' . $target . ' returned ' . $return_code);
}
public static function verifyAP($content, $http_headers)
{
$object = json_decode($content, true);
if (empty($object)) {
return false;
}
$actor = JsonLD::fetchElement($object, 'actor', 'id');
$headers = [];
$headers['(request-target)'] = strtolower($http_headers['REQUEST_METHOD']) . ' ' . $http_headers['REQUEST_URI'];
// First take every header
foreach ($http_headers as $k => $v) {
$field = str_replace('_', '-', strtolower($k));
$headers[$field] = $v;
}
// Now add every http header
foreach ($http_headers as $k => $v) {
if (strpos($k, 'HTTP_') === 0) {
$field = str_replace('_', '-', strtolower(substr($k, 5)));
$headers[$field] = $v;
}
}
$sig_block = self::parseSigHeader($http_headers['HTTP_SIGNATURE']);
if (empty($sig_block) || empty($sig_block['headers']) || empty($sig_block['keyId'])) {
return false;
}
$signed_data = '';
foreach ($sig_block['headers'] as $h) {
if (array_key_exists($h, $headers)) {
$signed_data .= $h . ': ' . $headers[$h] . "\n";
}
}
$signed_data = rtrim($signed_data, "\n");
if (empty($signed_data)) {
return false;
}
$algorithm = null;
if ($sig_block['algorithm'] === 'rsa-sha256') {
$algorithm = 'sha256';
}
if ($sig_block['algorithm'] === 'rsa-sha512') {
$algorithm = 'sha512';
}
if (empty($algorithm)) {
return false;
}
$key = self::fetchKey($sig_block['keyId'], $actor);
if (empty($key)) {
return false;
}
if (!Crypto::rsaVerify($signed_data, $sig_block['signature'], $key, $algorithm)) {
return false;
}
// Check the digest when it is part of the signed data
if (in_array('digest', $sig_block['headers'])) {
$digest = explode('=', $headers['digest'], 2);
if ($digest[0] === 'SHA-256') {
$hashalg = 'sha256';
}
if ($digest[0] === 'SHA-512') {
$hashalg = 'sha512';
}
/// @todo add all hashes from the rfc
if (!empty($hashalg) && base64_encode(hash($hashalg, $content, true)) != $digest[1]) {
return false;
}
}
// Check the content-length when it is part of the signed data
if (in_array('content-length', $sig_block['headers'])) {
if (strlen($content) != $headers['content-length']) {
return false;
}
}
return true;
}
private static function fetchKey($id, $actor)
{
$url = (strpos($id, '#') ? substr($id, 0, strpos($id, '#')) : $id);
$profile = ActivityPub::fetchprofile($url);
if (!empty($profile)) {
return $profile['pubkey'];
} elseif ($url != $actor) {
$profile = ActivityPub::fetchprofile($actor);
if (!empty($profile)) {
return $profile['pubkey'];
}
}
return false;
}
}

3
src/Worker/APDelivery.php
View file

@ -7,6 +7,7 @@ namespace Friendica\Worker;
use Friendica\BaseObject;
use Friendica\Protocol\ActivityPub;
use Friendica\Model\Item;
use Friendica\Util\HTTPSignature;
class APDelivery extends BaseObject
{
@ -20,7 +21,7 @@ class APDelivery extends BaseObject
} else {
$item = Item::selectFirst(['uid'], ['id' => $item_id]);
$data = ActivityPub::createActivityFromItem($item_id);
ActivityPub::transmit($data, $inbox, $item['uid']);
HTTPSignature::transmit($data, $inbox, $item['uid']);
}
return;