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Issue 8845: Signature support for "created" and "expires" added

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This commit is contained in:
Michael 2022-01-21 15:38:33 +00:00
parent 4c37fcb2d3
commit dbd6d10536
1 changed files with 38 additions and 5 deletions
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43
src/Util/HTTPSignature.php
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@ -509,6 +509,15 @@ class HTTPSignature
$sig_block = self::parseSigHeader($http_headers['HTTP_SIGNATURE']);
// Add fields from the signature block to the header. See issue 8845
if (!empty($sig_block['created']) && empty($headers['(created)'])) {
$headers['(created)'] = $sig_block['created'];
}
if (!empty($sig_block['expires']) && empty($headers['(expires)'])) {
$headers['(expires)'] = $sig_block['expires'];
}
if (empty($sig_block) || empty($sig_block['headers']) || empty($sig_block['keyId'])) {
Logger::info('No headers or keyId');
return false;
@ -518,6 +527,8 @@ class HTTPSignature
foreach ($sig_block['headers'] as $h) {
if (array_key_exists($h, $headers)) {
$signed_data .= $h . ': ' . $headers[$h] . "\n";
} else {
Logger::info('Requested header field not found', ['field' => $h, 'header' => $headers]);
}
}
$signed_data = rtrim($signed_data, "\n");
@ -572,7 +583,7 @@ class HTTPSignature
}
if (!Crypto::rsaVerify($signed_data, $sig_block['signature'], $key['pubkey'], $algorithm)) {
Logger::info('Verification failed');
Logger::info('Verification failed', ['signed_data' => $signed_data, 'algorithm' => $algorithm, 'header' => $sig_block['headers'], 'http_headers' => $http_headers]);
return false;
}
@ -598,13 +609,35 @@ class HTTPSignature
$hasGoodSignedContent = true;
}
if (in_array('date', $sig_block['headers']) && !empty($headers['date'])) {
$created = strtotime($headers['date']);
} elseif (in_array('(created)', $sig_block['headers']) && !empty($sig_block['created'])) {
$created = $sig_block['created'];
} else {
$created = 0;
}
if (in_array('(expires)', $sig_block['headers']) && !empty($sig_block['expires'])) {
$expired = min($sig_block['expires'], $created + 300);
} else {
$expired = $created + 300;
}
// Check if the signed date field is in an acceptable range
if (in_array('date', $sig_block['headers'])) {
$diff = abs(strtotime($headers['date']) - time());
if ($diff > 300) {
Logger::notice("Header date '" . $headers['date'] . "' is with " . $diff . " seconds out of the 300 second frame. The signature is invalid.");
if (!empty($created)) {
$current = time();
if ($created > $current) {
Logger::notice('Signature created in the future', ['created' => date(DateTimeFormat::MYSQL, $created), 'expired' => date(DateTimeFormat::MYSQL, $expired), 'current' => date(DateTimeFormat::MYSQL, $current)]);
return false;
}
if ($current > $expired) {
Logger::notice('Signature expired', ['created' => date(DateTimeFormat::MYSQL, $created), 'expired' => date(DateTimeFormat::MYSQL, $expired), 'current' => date(DateTimeFormat::MYSQL, $current)]);
return false;
}
Logger::debug('Valid creation date', ['created' => date(DateTimeFormat::MYSQL, $created), 'expired' => date(DateTimeFormat::MYSQL, $expired), 'current' => date(DateTimeFormat::MYSQL, $current)]);
$hasGoodSignedContent = true;
}