99 lines
4.1 KiB
PHP
99 lines
4.1 KiB
PHP
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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Security\Core\Signature;
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use Symfony\Component\PropertyAccess\PropertyAccessorInterface;
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use Symfony\Component\Security\Core\Signature\Exception\ExpiredSignatureException;
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use Symfony\Component\Security\Core\Signature\Exception\InvalidSignatureException;
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use Symfony\Component\Security\Core\User\UserInterface;
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/**
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* Creates and validates secure hashes used in login links and remember-me cookies.
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*
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* @author Wouter de Jong <wouter@wouterj.nl>
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* @author Ryan Weaver <ryan@symfonycasts.com>
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*/
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class SignatureHasher
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{
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private $propertyAccessor;
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private $signatureProperties;
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private $secret;
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private $expiredSignaturesStorage;
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private $maxUses;
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/**
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* @param array $signatureProperties properties of the User; the hash is invalidated if these properties change
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* @param ExpiredSignatureStorage|null $expiredSignaturesStorage if provided, secures a sequence of hashes that are expired
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* @param int|null $maxUses used together with $expiredSignatureStorage to allow a maximum usage of a hash
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*/
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public function __construct(PropertyAccessorInterface $propertyAccessor, array $signatureProperties, string $secret, ExpiredSignatureStorage $expiredSignaturesStorage = null, int $maxUses = null)
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{
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$this->propertyAccessor = $propertyAccessor;
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$this->signatureProperties = $signatureProperties;
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$this->secret = $secret;
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$this->expiredSignaturesStorage = $expiredSignaturesStorage;
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$this->maxUses = $maxUses;
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}
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/**
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* Verifies the hash using the provided user and expire time.
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*
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* @param int $expires the expiry time as a unix timestamp
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* @param string $hash the plaintext hash provided by the request
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*
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* @throws InvalidSignatureException If the signature does not match the provided parameters
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* @throws ExpiredSignatureException If the signature is no longer valid
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*/
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public function verifySignatureHash(UserInterface $user, int $expires, string $hash): void
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{
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if (!hash_equals($hash, $this->computeSignatureHash($user, $expires))) {
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throw new InvalidSignatureException('Invalid or expired signature.');
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}
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if ($expires < time()) {
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throw new ExpiredSignatureException('Signature has expired.');
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}
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if ($this->expiredSignaturesStorage && $this->maxUses) {
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if ($this->expiredSignaturesStorage->countUsages($hash) >= $this->maxUses) {
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throw new ExpiredSignatureException(sprintf('Signature can only be used "%d" times.', $this->maxUses));
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}
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$this->expiredSignaturesStorage->incrementUsages($hash);
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}
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}
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/**
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* Computes the secure hash for the provided user and expire time.
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*
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* @param int $expires the expiry time as a unix timestamp
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*/
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public function computeSignatureHash(UserInterface $user, int $expires): string
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{
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$signatureFields = [base64_encode(method_exists($user, 'getUserIdentifier') ? $user->getUserIdentifier() : $user->getUsername()), $expires];
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foreach ($this->signatureProperties as $property) {
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$value = $this->propertyAccessor->getValue($user, $property) ?? '';
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if ($value instanceof \DateTimeInterface) {
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$value = $value->format('c');
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}
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if (!is_scalar($value) && !(\is_object($value) && method_exists($value, '__toString'))) {
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throw new \InvalidArgumentException(sprintf('The property path "%s" on the user object "%s" must return a value that can be cast to a string, but "%s" was returned.', $property, \get_class($user), get_debug_type($value)));
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}
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$signatureFields[] = base64_encode($value);
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}
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return base64_encode(hash_hmac('sha256', implode(':', $signatureFields), $this->secret));
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}
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}
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