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<?php namespace Tuf\Metadata\Verifier; use Tuf\Exception\Attack\RollbackAttackException; use Tuf\Metadata\FileInfoMetadataBase; /** * Verifier for metadata classes that have information about other files. */ abstract class FileInfoVerifier extends VerifierBase { /** * Checks for rollback of files referenced in $untrustedMetadata. * * @param \Tuf\Metadata\FileInfoMetadataBase $untrustedMetadata * The untrusted metadata. * * @throws \Tuf\Exception\Attack\RollbackAttackException */ protected function checkFileInfoVersions(FileInfoMetadataBase $untrustedMetadata): void { // Check that all files in the trusted/local metadata info under the 'meta' section are less or equal to // the same files in the new metadata info. // For 'snapshot' type this is § 5.5.5. // For 'timestamp' type this is § 5.4.3.?. $localMetaFileInfos = $this->trustedMetadata->getSigned()['meta']; $type = $this->trustedMetadata->getType(); foreach ($localMetaFileInfos as $fileName => $localFileInfo) { /** @var \Tuf\Metadata\SnapshotMetadata|\Tuf\Metadata\TimestampMetadata $untrustedMetadata */ if ($remoteFileInfo = $untrustedMetadata->getFileMetaInfo($fileName, true)) { if ($remoteFileInfo['version'] < $localFileInfo['version']) { $message = "Remote $type metadata file '$fileName' version \"{$remoteFileInfo['version']}\" " . "is less than previously seen version \"{$localFileInfo['version']}\""; throw new RollbackAttackException($message); } } } } }
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