624 lines
No EOL
29 KiB
PHP
624 lines
No EOL
29 KiB
PHP
<?php
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namespace Socialbox;
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use Exception;
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use InvalidArgumentException;
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use Socialbox\Classes\Configuration;
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use Socialbox\Classes\Cryptography;
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use Socialbox\Classes\DnsHelper;
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use Socialbox\Classes\Logger;
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use Socialbox\Classes\ServerResolver;
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use Socialbox\Classes\Utilities;
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use Socialbox\Classes\Validator;
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use Socialbox\Enums\ReservedUsernames;
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use Socialbox\Enums\SessionState;
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use Socialbox\Enums\StandardError;
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use Socialbox\Enums\StandardHeaders;
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use Socialbox\Enums\StandardMethods;
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use Socialbox\Enums\Types\RequestType;
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use Socialbox\Exceptions\CryptographyException;
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use Socialbox\Exceptions\DatabaseOperationException;
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use Socialbox\Exceptions\RequestException;
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use Socialbox\Exceptions\StandardException;
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use Socialbox\Managers\RegisteredPeerManager;
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use Socialbox\Managers\SessionManager;
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use Socialbox\Objects\ClientRequest;
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use Socialbox\Objects\PeerAddress;
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use Socialbox\Objects\Standard\ServerInformation;
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use Throwable;
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class Socialbox
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{
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/**
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* Handles incoming client requests by parsing request headers, determining the request type,
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* and routing the request to the appropriate handler method. Implements error handling for
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* missing or invalid request types.
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*
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* @return void
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*/
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public static function handleRequest(): void
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{
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$requestHeaders = Utilities::getRequestHeaders();
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if(!isset($requestHeaders[StandardHeaders::REQUEST_TYPE->value]))
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{
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self::returnError(400, StandardError::BAD_REQUEST, 'Missing required header: ' . StandardHeaders::REQUEST_TYPE->value);
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return;
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}
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$clientRequest = new ClientRequest($requestHeaders, file_get_contents('php://input') ?? null);
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// Handle the request type, only `init` and `dhe` are not encrypted using the session's encrypted key
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// RPC Requests must be encrypted and signed by the client, vice versa for server responses.
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switch($clientRequest->getRequestType())
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{
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case RequestType::INFO:
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self::handleInformationRequest();
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break;
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case RequestType::INITIATE_SESSION:
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self::handleInitiateSession($clientRequest);
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break;
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case RequestType::DHE_EXCHANGE:
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self::handleDheExchange($clientRequest);
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break;
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case RequestType::RPC:
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self::handleRpc($clientRequest);
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break;
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default:
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self::returnError(400, StandardError::BAD_REQUEST, 'Invalid Request-Type header');
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}
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}
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/**
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* Handles an information request by setting the appropriate HTTP response code,
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* content type headers, and printing the server information in JSON format.
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*
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* @return void
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*/
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private static function handleInformationRequest(): void
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{
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http_response_code(200);
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header('Content-Type: application/json');
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Logger::getLogger()->info(json_encode(self::getServerInformation()->toArray(), JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE));
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print(json_encode(self::getServerInformation()->toArray(), JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE));
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}
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/**
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* Validates the initial headers of a client request to ensure all required headers exist
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* and contain valid values. If any validation fails, an error response is returned.
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*
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* @param ClientRequest $clientRequest The client request containing headers to be validated.
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* @return bool Returns true if all required headers are valid, otherwise false.
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*/
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private static function validateInitHeaders(ClientRequest $clientRequest): bool
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{
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if(!$clientRequest->getClientName())
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{
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self::returnError(400, StandardError::BAD_REQUEST, 'Missing required header: ' . StandardHeaders::CLIENT_NAME->value);
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return false;
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}
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if(!$clientRequest->getClientVersion())
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{
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self::returnError(400, StandardError::BAD_REQUEST, 'Missing required header: ' . StandardHeaders::CLIENT_VERSION->value);
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return false;
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}
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if(!$clientRequest->headerExists(StandardHeaders::SIGNING_PUBLIC_KEY))
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{
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self::returnError(400, StandardError::BAD_REQUEST, 'Missing required header: ' . StandardHeaders::SIGNING_PUBLIC_KEY->value);
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return false;
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}
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if(!$clientRequest->headerExists(StandardHeaders::ENCRYPTION_PUBLIC_KEY))
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{
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self::returnError(400, StandardError::BAD_REQUEST, 'Missing required header: ' . StandardHeaders::ENCRYPTION_PUBLIC_KEY->value);
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return false;
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}
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if(!$clientRequest->headerExists(StandardHeaders::IDENTIFY_AS))
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{
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self::returnError(400, StandardError::BAD_REQUEST, 'Missing required header: ' . StandardHeaders::IDENTIFY_AS->value);
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return false;
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}
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if(!Validator::validatePeerAddress($clientRequest->getHeader(StandardHeaders::IDENTIFY_AS)))
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{
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self::returnError(400, StandardError::BAD_REQUEST, 'Invalid Identify-As header: ' . $clientRequest->getHeader(StandardHeaders::IDENTIFY_AS));
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return false;
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}
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return true;
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}
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/**
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* Handles the initiation of a session for a client request. This involves validating headers,
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* verifying peer identities, resolving domains, registering peers if necessary, and finally
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* creating a session while providing the required session UUID as a response.
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*
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* @param ClientRequest $clientRequest The incoming client request containing all necessary headers
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* and identification information required to initiate the session.
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* @return void
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*/
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private static function handleInitiateSession(ClientRequest $clientRequest): void
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{
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// This is only called for the `init` request type
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if(!self::validateInitHeaders($clientRequest))
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{
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return;
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}
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// We always accept the client's public key at first
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$clientPublicSigningKey = $clientRequest->getHeader(StandardHeaders::SIGNING_PUBLIC_KEY);
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$clientPublicEncryptionKey = $clientRequest->getHeader(StandardHeaders::ENCRYPTION_PUBLIC_KEY);
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// If the peer is identifying as the same domain
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if($clientRequest->getIdentifyAs()->getDomain() === Configuration::getInstanceConfiguration()->getDomain())
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{
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// Prevent the peer from identifying as the host unless it's coming from an external domain
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if($clientRequest->getIdentifyAs()->getUsername() === ReservedUsernames::HOST->value)
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{
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self::returnError(403, StandardError::FORBIDDEN, 'Unauthorized: Not allowed to identify as the host');
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return;
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}
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}
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// If the peer is identifying as an external domain
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else
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{
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// Only allow the host to identify as an external peer
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if($clientRequest->getIdentifyAs()->getUsername() !== ReservedUsernames::HOST->value)
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{
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self::returnError(403, StandardError::FORBIDDEN, 'Forbidden: Any external peer must identify as the host, only the host can preform actions on behalf of it\'s peers');
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return;
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}
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try
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{
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// We need to obtain the public key of the host, since we can't trust the client (Use database)
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$resolvedServer = ServerResolver::resolveDomain($clientRequest->getIdentifyAs()->getDomain());
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// Override the public signing key with the resolved server's public key
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// Encryption key can be left as is.
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$clientPublicSigningKey = $resolvedServer->getPublicSigningKey();
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}
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catch (Exception $e)
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{
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self::returnError(502, StandardError::RESOLUTION_FAILED, 'Conflict: Failed to resolve the host domain: ' . $e->getMessage(), $e);
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return;
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}
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}
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try
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{
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// Check if we have a registered peer with the same address
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$registeredPeer = RegisteredPeerManager::getPeerByAddress($clientRequest->getIdentifyAs());
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// If the peer is registered, check if it is enabled
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if($registeredPeer !== null && !$registeredPeer->isEnabled())
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{
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// Refuse to create a session if the peer is disabled/banned, this usually happens when
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// a peer gets banned or more commonly when a client attempts to register as this peer but
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// destroyed the session before it was created.
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// This is to prevent multiple sessions from being created for the same peer, this is cleaned up
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// with a cron job using `socialbox clean-sessions`
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self::returnError(403, StandardError::FORBIDDEN, 'Unauthorized: The requested peer is disabled/banned');
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return;
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}
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// Otherwise the peer isn't registered, so we need to register it
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else
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{
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// Check if registration is enabled
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if(!Configuration::getRegistrationConfiguration()->isRegistrationEnabled())
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{
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self::returnError(401, StandardError::UNAUTHORIZED, 'Unauthorized: Registration is disabled');
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return;
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}
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// Register the peer if it is not already registered
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$peerUuid = RegisteredPeerManager::createPeer(PeerAddress::fromAddress($clientRequest->getHeader(StandardHeaders::IDENTIFY_AS)));
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// Retrieve the peer object
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$registeredPeer = RegisteredPeerManager::getPeer($peerUuid);
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}
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// Generate server's encryption keys for this session
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$serverEncryptionKey = Cryptography::generateEncryptionKeyPair();
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// Create the session passing on the registered peer, client name, version, and public keys
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$sessionUuid = SessionManager::createSession($registeredPeer, $clientRequest->getClientName(), $clientRequest->getClientVersion(), $clientPublicSigningKey, $clientPublicEncryptionKey, $serverEncryptionKey);
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// The server responds back with the session UUID & The server's public encryption key as the header
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http_response_code(201); // Created
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header('Content-Type: text/plain');
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header(StandardHeaders::ENCRYPTION_PUBLIC_KEY->value . ': ' . $serverEncryptionKey->getPublicKey());
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print($sessionUuid); // Return the session UUID
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}
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catch(InvalidArgumentException $e)
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{
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// This is usually thrown due to an invalid input
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self::returnError(400, StandardError::BAD_REQUEST, $e->getMessage(), $e);
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}
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catch(Exception $e)
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{
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self::returnError(500, StandardError::INTERNAL_SERVER_ERROR, 'An internal error occurred while initiating the session', $e);
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}
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}
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/**
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* Handles the Diffie-Hellman Ephemeral (DHE) key exchange process between the client and server,
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* ensuring secure transport encryption key negotiation. The method validates request headers,
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* session state, and cryptographic operations, and updates the session with the resulting keys
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* and state upon successful negotiation.
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*
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* @param ClientRequest $clientRequest The request object containing headers, body, and session details
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* required to perform the DHE exchange.
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*
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* @return void
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*/
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private static function handleDheExchange(ClientRequest $clientRequest): void
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{
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// Check if the session UUID is set in the headers, bad request if not
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if(!$clientRequest->headerExists(StandardHeaders::SESSION_UUID))
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{
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self::returnError(400, StandardError::BAD_REQUEST, 'Missing required header: ' . StandardHeaders::SESSION_UUID->value);
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return;
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}
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if(!$clientRequest->headerExists(StandardHeaders::SIGNATURE))
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{
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self::returnError(400, StandardError::BAD_REQUEST, 'Missing required header: ' . StandardHeaders::SIGNATURE->value);
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return;
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}
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if(empty($clientRequest->getHeader(StandardHeaders::SIGNATURE)))
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{
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self::returnError(400, StandardError::BAD_REQUEST, 'Bad request: The signature is empty');
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return;
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}
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// Check if the request body is empty, bad request if so
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if(empty($clientRequest->getRequestBody()))
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{
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self::returnError(400, StandardError::BAD_REQUEST, 'Bad request: The key exchange request body is empty');
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return;
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}
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// Check if the session is awaiting a DHE exchange, forbidden if not
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$session = $clientRequest->getSession();
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if($session->getState() !== SessionState::AWAITING_DHE)
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{
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self::returnError(403, StandardError::FORBIDDEN, 'Bad request: The session is not awaiting a DHE exchange');
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return;
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}
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// DHE STAGE: CLIENT -> SERVER
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// Server & Client: Begin the DHE exchange using the exchanged public keys.
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// On the client's side, same method but with the server's public key & client's private key
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try
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{
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$sharedSecret = Cryptography::performDHE($session->getClientPublicEncryptionKey(), $session->getServerPrivateEncryptionKey());
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}
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catch (CryptographyException $e)
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{
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Logger::getLogger()->error('Failed to perform DHE exchange', $e);
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self::returnError(422, StandardError::CRYPTOGRAPHIC_ERROR, 'DHE exchange failed', $e);
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return;
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}
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// STAGE 1: CLIENT -> SERVER
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try
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{
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// Attempt to decrypt the encrypted key passed on from the client using the shared secret
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$clientTransportEncryptionKey = Cryptography::decryptShared($clientRequest->getRequestBody(), $sharedSecret);
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}
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catch (CryptographyException $e)
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{
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self::returnError(400, StandardError::CRYPTOGRAPHIC_ERROR, 'Failed to decrypt the key', $e);
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return;
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}
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// Get the signature from the client and validate it against the decrypted key
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$clientSignature = $clientRequest->getHeader(StandardHeaders::SIGNATURE);
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if(!Cryptography::verifyMessage($clientTransportEncryptionKey, $clientSignature, $session->getClientPublicSigningKey()))
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{
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self::returnError(401, StandardError::UNAUTHORIZED, 'Invalid signature');
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return;
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}
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// Validate the encryption key given by the client
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if(!Cryptography::validateEncryptionKey($clientTransportEncryptionKey, Configuration::getCryptographyConfiguration()->getTransportEncryptionAlgorithm()))
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{
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self::returnError(400, StandardError::BAD_REQUEST, 'The transport encryption key is invalid and does not meet the server\'s requirements');
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return;
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}
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// Receive stage complete, now we move on to the server's response
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// STAGE 2: SERVER -> CLIENT
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try
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{
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// Generate the server's transport encryption key (our side)
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$serverTransportEncryptionKey = Cryptography::generateEncryptionKey(Configuration::getCryptographyConfiguration()->getTransportEncryptionAlgorithm());
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// Sign the shared secret using the server's private key
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$signature = Cryptography::signMessage($serverTransportEncryptionKey, Configuration::getCryptographyConfiguration()->getHostPrivateKey());
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// Encrypt the server's transport key using the shared secret
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$encryptedServerTransportKey = Cryptography::encryptShared($serverTransportEncryptionKey, $sharedSecret);
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}
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catch (CryptographyException $e)
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{
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Logger::getLogger()->error('Failed to generate the server\'s transport encryption key', $e);
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self::returnError(500, StandardError::INTERNAL_SERVER_ERROR, 'There was an error while trying to process the DHE exchange', $e);
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return;
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}
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// Now update the session details with all the encryption keys and the state
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try
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{
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SessionManager::setEncryptionKeys($clientRequest->getSessionUuid(), $sharedSecret, $clientTransportEncryptionKey, $serverTransportEncryptionKey);
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SessionManager::updateState($clientRequest->getSessionUuid(), SessionState::ACTIVE);
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}
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catch (DatabaseOperationException $e)
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{
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Logger::getLogger()->error('Failed to set the encryption key for the session', $e);
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self::returnError(500, StandardError::INTERNAL_SERVER_ERROR, 'Failed to set the encryption key for the session', $e);
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return;
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}
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// Return the encrypted transport key for the server back to the client.
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http_response_code(200);
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header('Content-Type: application/octet-stream');
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header(StandardHeaders::SIGNATURE->value . ': ' . $signature);
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print($encryptedServerTransportKey);
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}
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/**
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* Handles a Remote Procedure Call (RPC) request, ensuring proper decryption,
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* signature verification, and response encryption, while processing one or more
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* RPC methods as specified in the request.
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*
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* @param ClientRequest $clientRequest The RPC client request containing headers, body, and session information.
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*
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* @return void
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*/
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private static function handleRpc(ClientRequest $clientRequest): void
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{
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// Client: Encrypt the request body using the server's encryption key & sign it using the client's private key
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// Server: Decrypt the request body using the servers's encryption key & verify the signature using the client's public key
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// Server: Encrypt the response using the client's encryption key & sign it using the server's private key
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if(!$clientRequest->headerExists(StandardHeaders::SESSION_UUID))
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{
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self::returnError(400, StandardError::BAD_REQUEST, 'Missing required header: ' . StandardHeaders::SESSION_UUID->value);
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return;
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}
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if(!$clientRequest->headerExists(StandardHeaders::SIGNATURE))
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{
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self::returnError(400, StandardError::BAD_REQUEST, 'Missing required header: ' . StandardHeaders::SIGNATURE->value);
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return;
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}
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// Get the client session
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$session = $clientRequest->getSession();
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// Verify if the session is active
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if($session->getState() !== SessionState::ACTIVE)
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{
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self::returnError(403, StandardError::FORBIDDEN, 'Session is not active (' . $session->getState()->value . ')');
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return;
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}
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try
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{
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SessionManager::updateLastRequest($session->getUuid());
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}
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catch (DatabaseOperationException $e)
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{
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Logger::getLogger()->error('Failed to update the last request time for the session', $e);
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self::returnError(500, StandardError::INTERNAL_SERVER_ERROR, 'Failed to update the session', $e);
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return;
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}
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try
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{
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// Attempt to decrypt the request body using the server's encryption key
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$decryptedContent = Cryptography::decryptMessage($clientRequest->getRequestBody(), $session->getServerTransportEncryptionKey(), Configuration::getCryptographyConfiguration()->getTransportEncryptionAlgorithm());
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}
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catch(CryptographyException $e)
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{
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self::returnError(400, StandardError::CRYPTOGRAPHIC_ERROR, 'Failed to decrypt request', $e);
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return;
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}
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// Attempt to verify the decrypted content using the client's public signing key
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if(!Cryptography::verifyMessage($decryptedContent, $clientRequest->getSignature(), $session->getClientPublicSigningKey()))
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{
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self::returnError(400, StandardError::CRYPTOGRAPHIC_ERROR, 'Signature verification failed');
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return;
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}
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try
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{
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$clientRequests = $clientRequest->getRpcRequests($decryptedContent);
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}
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catch (RequestException $e)
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{
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self::returnError($e->getCode(), $e->getStandardError(), $e->getMessage());
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return;
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}
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Logger::getLogger()->verbose(sprintf('Received %d RPC request(s) from %s', count($clientRequests), $_SERVER['REMOTE_ADDR']));
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$results = [];
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foreach($clientRequests as $rpcRequest)
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{
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$method = StandardMethods::tryFrom($rpcRequest->getMethod());
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try
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{
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$method->checkAccess($clientRequest);
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}
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catch (StandardException $e)
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{
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$response = $e->produceError($rpcRequest);
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$results[] = $response->toArray();
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continue;
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}
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if($method === false)
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{
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Logger::getLogger()->warning('The requested method does not exist');
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$response = $rpcRequest->produceError(StandardError::RPC_METHOD_NOT_FOUND, 'The requested method does not exist');
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}
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else
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{
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try
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{
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Logger::getLogger()->debug(sprintf('Processing RPC request for method %s', $rpcRequest->getMethod()));
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$response = $method->execute($clientRequest, $rpcRequest);
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Logger::getLogger()->debug(sprintf('%s method executed successfully', $rpcRequest->getMethod()));
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}
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catch(StandardException $e)
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{
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Logger::getLogger()->error('An error occurred while processing the RPC request', $e);
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$response = $e->produceError($rpcRequest);
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}
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catch(Exception $e)
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{
|
|
Logger::getLogger()->error('An internal error occurred while processing the RPC request', $e);
|
|
if(Configuration::getSecurityConfiguration()->isDisplayInternalExceptions())
|
|
{
|
|
$response = $rpcRequest->produceError(StandardError::INTERNAL_SERVER_ERROR, Utilities::throwableToString($e));
|
|
}
|
|
else
|
|
{
|
|
$response = $rpcRequest->produceError(StandardError::INTERNAL_SERVER_ERROR);
|
|
}
|
|
}
|
|
}
|
|
|
|
if($response !== null)
|
|
{
|
|
Logger::getLogger()->debug(sprintf('Producing response for method %s', $rpcRequest->getMethod()));
|
|
$results[] = $response->toArray();
|
|
}
|
|
}
|
|
|
|
$response = null;
|
|
|
|
if(count($results) == 0)
|
|
{
|
|
$response = null;
|
|
}
|
|
elseif(count($results) == 1)
|
|
{
|
|
$response = json_encode($results[0], JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
|
|
}
|
|
else
|
|
{
|
|
$response = json_encode($results, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
|
|
}
|
|
|
|
if($response === null)
|
|
{
|
|
http_response_code(204);
|
|
return;
|
|
}
|
|
|
|
$session = $clientRequest->getSession();
|
|
|
|
try
|
|
{
|
|
$encryptedResponse = Cryptography::encryptMessage(
|
|
message: $response,
|
|
encryptionKey: $session->getClientTransportEncryptionKey(),
|
|
algorithm: Configuration::getCryptographyConfiguration()->getTransportEncryptionAlgorithm()
|
|
);
|
|
|
|
$signature = Cryptography::signMessage(
|
|
message: $response,
|
|
privateKey: Configuration::getCryptographyConfiguration()->getHostPrivateKey()
|
|
);
|
|
}
|
|
catch (Exceptions\CryptographyException $e)
|
|
{
|
|
self::returnError(500, StandardError::INTERNAL_SERVER_ERROR, 'Failed to encrypt the server response', $e);
|
|
return;
|
|
}
|
|
|
|
http_response_code(200);
|
|
header('Content-Type: application/octet-stream');
|
|
header(StandardHeaders::SIGNATURE->value . ': ' . $signature);
|
|
print($encryptedResponse);
|
|
}
|
|
|
|
/**
|
|
* Sends an error response by setting the HTTP response code, headers, and printing an error message.
|
|
* Optionally includes exception details in the response if enabled in the configuration.
|
|
* Logs the error message and any associated exception.
|
|
*
|
|
* @param int $responseCode The HTTP response code to send.
|
|
* @param StandardError $standardError The standard error containing error details.
|
|
* @param string|null $message An optional error message to display. Defaults to the message from the StandardError instance.
|
|
* @param Throwable|null $e An optional throwable to include in logs and the response, if enabled.
|
|
*
|
|
* @return void
|
|
*/
|
|
private static function returnError(int $responseCode, StandardError $standardError, ?string $message=null, ?Throwable $e=null): void
|
|
{
|
|
if($message === null)
|
|
{
|
|
$message = $standardError->getMessage();
|
|
}
|
|
|
|
http_response_code($responseCode);
|
|
header('Content-Type: text/plain');
|
|
header(StandardHeaders::ERROR_CODE->value . ': ' . $standardError->value);
|
|
print($message);
|
|
|
|
if(Configuration::getSecurityConfiguration()->isDisplayInternalExceptions() && $e !== null)
|
|
{
|
|
print(PHP_EOL . PHP_EOL . Utilities::throwableToString($e));
|
|
}
|
|
|
|
if($e !== null)
|
|
{
|
|
Logger::getLogger()->error($message, $e);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Retrieves the server information by assembling data from the configuration settings.
|
|
*
|
|
* @return ServerInformation An instance of ServerInformation containing details such as server name, hashing algorithm,
|
|
* transport AES mode, and AES key length.
|
|
*/
|
|
public static function getServerInformation(): ServerInformation
|
|
{
|
|
return ServerInformation::fromArray([
|
|
'server_name' => Configuration::getInstanceConfiguration()->getName(),
|
|
'server_keypair_expires' => Configuration::getCryptographyConfiguration()->getHostKeyPairExpires(),
|
|
'transport_encryption_algorithm' => Configuration::getCryptographyConfiguration()->getTransportEncryptionAlgorithm()
|
|
]);
|
|
}
|
|
|
|
/**
|
|
* Retrieves the DNS record by generating a TXT record using the RPC endpoint,
|
|
* host public key, and host key pair expiration from the configuration.
|
|
*
|
|
* @return string The generated DNS TXT record.
|
|
*/
|
|
public static function getDnsRecord(): string
|
|
{
|
|
return DnsHelper::generateTxt(
|
|
Configuration::getInstanceConfiguration()->getRpcEndpoint(),
|
|
Configuration::getCryptographyConfiguration()->getHostPublicKey(),
|
|
Configuration::getCryptographyConfiguration()->getHostKeyPairExpires()
|
|
);
|
|
}
|
|
} |