Verify that a reference name is valid
Description
Verifies a dNSName for HTTPS usage, (almost) as per Firefox’s rules:
- Wildcards can only occur in a name with more than 3 components
- Wildcards can only occur as the last character in the first component
- Wildcards may be preceded by additional characters
We modify these rules to be a bit stricter and only allow the wildcard character to be the full first component; that is, with the exclusion of the third rule.
Parameters
$referencestring|WpOrgRequestsStringablerequired- Reference dNSName
Source
public static function verify_reference_name($reference) {
if (InputValidator::is_string_or_stringable($reference) === false) {
throw InvalidArgument::create(1, '$reference', 'string|Stringable', gettype($reference));
}
if ($reference === '') {
return false;
}
if (preg_match('`\s`', $reference) > 0) {
// Whitespace detected. This can never be a dNSName.
return false;
}
$parts = explode('.', $reference);
if ($parts !== array_filter($parts)) {
// DNSName cannot contain two dots next to each other.
return false;
}
// Check the first part of the name
$first = array_shift($parts);
if (strpos($first, '*') !== false) {
// Check that the wildcard is the full part
if ($first !== '*') {
return false;
}
// Check that we have at least 3 components (including first)
if (count($parts) < 2) {
return false;
}
}
// Check the remaining parts
foreach ($parts as $part) {
if (strpos($part, '*') !== false) {
return false;
}
}
// Nothing found, verified!
return true;
}
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