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<?php
namespace Zotlabs\Module;
use Zotlabs\Web\HTTPSig;
use Zotlabs\Lib\Verify;
use Zotlabs\Web\Controller;
/**
* OpenWebAuth verifier and token generator
* See spec/OpenWebAuth/Home.md
* Requests to this endpoint should be signed using HTTP Signatures
* using the 'Authorization: Signature' authentication method
* If the signature verifies a token is returned.
*
* This token may be exchanged for an authenticated cookie.
*/
class Owa extends Controller {
public function init(): void
{
$ret = [ 'success' => false ];
if (!$this->validateAuthorizationHeader()) {
$this->error('Missing or invalid authorization header.');
}
$sigblock = HTTPSig::parse_sigheader($_SERVER['HTTP_AUTHORIZATION']);
if ($sigblock) {
$keyId = $sigblock['keyId'];
$parsed = parse_url($keyId);
if (str_starts_with($parsed['scheme'],'http')) {
unset($parsed['fragment']);
unset($parsed['query']);
$keyId = unparse_url($parsed);
}
else {
$keyId = str_replace('acct:', '', $keyId);
}
if ($keyId) {
$r = q("SELECT * FROM hubloc LEFT JOIN xchan ON hubloc_hash = xchan_hash
WHERE (hubloc_addr = '%s' OR hubloc_id_url = '%s' OR xchan_hash = '%s')
AND hubloc_deleted = 0 AND xchan_pubkey != ''
ORDER BY hubloc_id DESC",
dbesc($keyId),
dbesc($keyId),
dbesc($keyId)
);
if (! $r) {
$found = discover_by_webbie($keyId);
logger('found = ' . print_r($found, true));
if ($found) {
$r = q("SELECT * FROM hubloc LEFT JOIN xchan ON hubloc_hash = xchan_hash
WHERE (hubloc_addr = '%s' OR hubloc_id_url = '%s' OR xchan_hash = '%s') AND hubloc_deleted = 0 AND xchan_pubkey != '' ORDER BY hubloc_id DESC ",
dbesc($keyId),
dbesc($keyId),
dbesc($keyId)
);
}
}
if ($r) {
foreach ($r as $hubloc) {
$verified = HTTPSig::verify(file_get_contents('php://input'), $hubloc['xchan_pubkey']);
if ($verified && $verified['header_signed'] && $verified['header_valid'] && ($verified['content_valid'] || (! $verified['content_signed']))) {
logger('OWA header: ' . print_r($verified,true),LOGGER_DATA);
logger('OWA success: ' . $hubloc['hubloc_id_url'],LOGGER_DATA);
$ret['success'] = true;
$token = random_string(32);
Verify::create('owt',0,$token,$hubloc['hubloc_id_url']);
$result = '';
openssl_public_encrypt($token,$result,$hubloc['xchan_pubkey']);
$ret['encrypted_token'] = base64url_encode($result);
break;
} else {
logger('OWA fail: ' . $hubloc['hubloc_id'] . ' ' . $hubloc['hubloc_id_url']);
}
}
if (!$ret['success']) {
// Possible a reinstall?
// In this case we probably already have an old hubloc
// but not the new one yet.
$found = discover_by_webbie($keyId);
if ($found) {
$r = q("SELECT * FROM hubloc LEFT JOIN xchan ON hubloc_hash = xchan_hash
WHERE (hubloc_addr = '%s' OR hubloc_id_url = '%s') AND hubloc_deleted = 0 ORDER BY hubloc_id DESC LIMIT 1",
dbesc(str_replace('acct:', '', $keyId)),
dbesc($keyId)
);
if ($r) {
$verified = HTTPSig::verify(file_get_contents('php://input'), $r[0]['xchan_pubkey']);
if ($verified && $verified['header_signed'] && $verified['header_valid'] && ($verified['content_valid'] || (! $verified['content_signed']))) {
logger('OWA header: ' . print_r($verified,true), LOGGER_DATA);
logger('OWA success: ' . $r[0]['hubloc_id_url'], LOGGER_DATA);
$ret['success'] = true;
$token = random_string(32);
Verify::create('owt', 0, $token, $r[0]['hubloc_id_url']);
$result = '';
openssl_public_encrypt($token, $result, $r[0]['xchan_pubkey']);
$ret['encrypted_token'] = base64url_encode($result);
} else {
logger('OWA fail: ' . $hubloc['hubloc_id'] . ' ' . $hubloc['hubloc_id_url']);
}
}
}
}
}
}
}
json_return_and_die($ret,'application/x-zot+json');
}
private function validateAuthorizationHeader(): bool
{
if (!empty($_SERVER['HTTP_AUTHORIZATION'])) {
$auth = trim($_SERVER['HTTP_AUTHORIZATION']);
} else if (!empty($_SERVER['REDIRECT_REMOTE_USER'])) {
$auth = trim($_SERVER['REDIRECT_REMOTE_USER']);
} else {
return false;
}
return strncmp($auth, 'Signature', 9) === 0;
}
/**
* Terminates the request, and return a json error response.
*
* @Note This function does not return!
*
* @param string $msg The error message for the response.
*/
private function error(string $msg): void {
$ret = [
'success' => false,
'message' => $msg
];
json_return_and_die($ret,'application/x-zot+json');
}
}
|
