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PHP 8.1.34
Preview: Pipeline.php Size: 18.57 KB
/home2/astrociv/public_html/asquarebuildcon.in/wp-content/plugins/imunify-security/inc/App/Bot/Pipeline.php
<?php
/**
 * Copyright (с) Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2025 All Rights Reserved
 *
 * Licensed under CLOUD LINUX LICENSE AGREEMENT
 * https://www.cloudlinux.com/legal/
 */

namespace CloudLinux\Imunify\App\Bot;

/**
 * Per-request bot-protection orchestrator.
 *
 * Pipeline steps, in order:
 *   1. Build request context (URI, headers, REMOTE_ADDR, resolved client IP,
 *      UA). RealIpResolver is applied up front so a single resolved IP flows
 *      through the whitelist, allowlist, classifier, and rate limiter.
 *   2. IP allowlist: the Imunify360 local IP whitelist, then the site
 *      owner's IP entries — a hit returns immediately, ahead of the honeypot
 *      and the request allowlist. The hosting admin or the site owner put the
 *      IP there, so it is allowed in every case, a honeypot hit included.
 *   3. Honeypot check, then the request allowlist (built-in rules and the
 *      site owner's REST, path and user-agent entries) — on a match, return.
 *      A honeypot hit skips this step.
 *   Every allowlist match is recorded as WHITELISTED, its match type in the
 *   `bot` field.
 *   4. Classify — any exception from the classifier fails open.
 *   5. Rate-limit on the resolved IP — any exception fails open. Passing
 *      $remote_addr here would collapse every CDN visitor onto the edge
 *      IP's counter, either throttling legitimate users or ignoring bots.
 *   6. Responder emits 429/403 (or returns on ALLOW).
 *
 * The pipeline itself never calls exit(): only Responder does. That
 * makes the whole pipeline unit-testable and keeps the fail-open
 * promise loadable — any uncaught exception at any step converts to
 * "pass through to WordPress".
 *
 * Per-event logging is deferred to a future phase — no EventLogger
 * collaborator here. Observation hooks will be added at the same
 * call sites when the bot traffic dashboard ships.
 *
 * @since 4.0.0
 * @since 4.1.4 Applies the site owner's IP entries and records every allowlist match with its type.
 */
class Pipeline {

	/**
	 * Bot classification engine.
	 *
	 * @var Classifier
	 */
	private $classifier;

	/**
	 * Per-IP rate limiter with category-aware decision.
	 *
	 * @var RateLimiter
	 */
	private $rateLimiter;

	/**
	 * Ordered composite of AllowlistMatcher instances.
	 *
	 * @var RequestAllowlist
	 */
	private $allowlist;

	/**
	 * Response emitter; centralises exit() so Pipeline stays testable.
	 *
	 * @var Responder
	 */
	private $responder;

	/**
	 * Anti-spoofing real-client-IP resolver.
	 *
	 * Shared with Classifier so both see the same decoded client IP.
	 *
	 * @var RealIpResolver
	 */
	private $realIpResolver;

	/**
	 * 24-hour blocked-request counter feeding the dashboard widget.
	 * Optional — null means no counter is recorded, which keeps legacy
	 * Pipeline constructions in other contexts working.
	 *
	 * @var DailyCounter|null
	 */
	private $dailyCounter;

	/**
	 * Hourly bot-traffic rollup feeding the dashboard. Optional — null means
	 * detailed stats capture is off (feature gate or site-owner opt-out), and
	 * the pipeline behaves exactly as it did before stats shipped.
	 *
	 * @var HourlyStatsStorage|null
	 */
	private $statsStorage;

	/**
	 * Per-IP hourly detail feeding the dashboard drill-down. Optional — null
	 * when detailed stats capture is off, exactly like {@see $statsStorage}.
	 *
	 * @var HourlyIpStatsStorage|null
	 */
	private $ipStatsStorage;

	/**
	 * Imunify360 local IP whitelist exported by the agent. Optional — null
	 * means no whitelist bypass, which is how the pipeline behaved before
	 * the agent started exporting the file.
	 *
	 * @var IpWhitelist|null
	 */
	private $ipWhitelist;

	/**
	 * The site owner's allowlist; only its IP entries are used here, the rest
	 * reach the request allowlist through SiteOwnerMatcher. Optional — null
	 * means no site-owner IP entries.
	 *
	 * @var SiteAllowlist|null
	 */
	private $siteAllowlist;

	/**
	 * Wire up the pipeline over its collaborators.
	 *
	 * @param Classifier                $classifier       Bot classifier.
	 * @param RateLimiter               $rate_limiter     Category-aware rate limiter.
	 * @param RequestAllowlist          $allowlist        Composite of AllowlistMatcher instances.
	 * @param Responder                 $responder        HTTP response emitter.
	 * @param RealIpResolver            $real_ip_resolver Anti-spoofing client-IP resolver.
	 * @param DailyCounter|null         $daily_counter    Optional 24h blocked-request counter.
	 * @param HourlyStatsStorage|null   $stats_storage    Optional hourly rollup recorder.
	 * @param HourlyIpStatsStorage|null $ip_stats_storage Optional per-IP detail recorder.
	 * @param IpWhitelist|null          $ip_whitelist     Optional local IP whitelist.
	 * @param SiteAllowlist|null        $site_allowlist   Optional site-owner allowlist, for its IP entries.
	 */
	public function __construct( $classifier, $rate_limiter, $allowlist, $responder, $real_ip_resolver, $daily_counter = null, $stats_storage = null, $ip_stats_storage = null, $ip_whitelist = null, $site_allowlist = null ) {
		$this->classifier     = $classifier;
		$this->rateLimiter    = $rate_limiter;
		$this->allowlist      = $allowlist;
		$this->responder      = $responder;
		$this->realIpResolver = $real_ip_resolver;
		$this->dailyCounter   = $daily_counter;
		$this->statsStorage   = $stats_storage;
		$this->ipStatsStorage = $ip_stats_storage;
		$this->ipWhitelist    = $ip_whitelist;
		$this->siteAllowlist  = $site_allowlist;
	}

	/**
	 * Run the pipeline over a captured $_SERVER snapshot.
	 *
	 * @param array $server Raw $_SERVER snapshot.
	 * @return void
	 */
	public function run( $server ) {
		// PHP 7+ error types (TypeError, Error) descend from \Throwable,
		// not \Exception, so catching only Exception would let them
		// escape the outer fail-open wrapper. Match the dual-path
		// pattern in the mu-plugin shim and SafeInclude::load().
		if ( interface_exists( 'Throwable' ) ) {
			try {
				$this->runInner( $server );
			} catch ( \Throwable $t ) { // phpcs:ignore Generic.CodeAnalysis.EmptyStatement.DetectedCatch -- fail-open: any uncaught throwable passes through to WordPress.
			}
			return;
		}
		try {
			$this->runInner( $server );
		} catch ( \Exception $e ) { // phpcs:ignore Generic.CodeAnalysis.EmptyStatement.DetectedCatch -- fail-open: any uncaught exception passes through to WordPress.
		}
	}

	/**
	 * The allowlist rule that would let this request through, from steps 1 to 3 exactly as
	 * run() takes them, without recording it or answering the request. "Check a request"
	 * asks this, so its answer cannot differ from what requests get.
	 *
	 * @since 4.1.4
	 *
	 * @param array $server $_SERVER snapshot of the request.
	 * @return AllowlistMatch|null Null when the request goes on to classification.
	 */
	public function allowlistMatch( $server ) {
		$request = $this->readRequest( $server );
		return $this->matchAllowlist( $request );
	}

	/**
	 * Inner pipeline body without the fail-open wrapper.
	 *
	 * @param array $server Raw $_SERVER snapshot.
	 * @return void
	 */
	private function runInner( $server ) {
		$request   = $this->readRequest( $server );
		$headers   = $request['context']['headers'];
		$client_ip = $request['context']['ip'];

		$match = $this->matchAllowlist( $request );
		if ( null !== $match ) {
			$this->recordAllowlisted( $match, $client_ip );
			return;
		}

		$remote_addr = $request['context']['remote_addr'];
		$protocol    = $request['protocol'];
		$honeypot    = $request['honeypot'];

		// Per-step fail-open: a throw from classifier or rate limiter
		// must NOT propagate past this step. Use the dual-path
		// Throwable/Exception pattern (same as run()) so PHP 7+
		// TypeError/Error are caught here, not by the outer wrapper —
		// without this, an Error in the classifier would skip
		// step-level isolation and surface as an undecorated outer
		// fail-open. Phpcs ignores below: fail-open by design.
		if ( interface_exists( 'Throwable' ) ) {
			try {
				$classification = $this->classifier->classify( $headers, $remote_addr, $protocol, $honeypot );
			} catch ( \Throwable $t ) { // phpcs:ignore Generic.CodeAnalysis.EmptyStatement.DetectedCatch -- fail-open: classifier throw passes through to WordPress.
				return;
			}
		} else {
			try {
				$classification = $this->classifier->classify( $headers, $remote_addr, $protocol, $honeypot );
			} catch ( \Exception $e ) { // phpcs:ignore Generic.CodeAnalysis.EmptyStatement.DetectedCatch -- fail-open: classifier throw passes through to WordPress.
				return;
			}
		}

		$category = $classification->getCategory();

		if ( interface_exists( 'Throwable' ) ) {
			try {
				$decision = $this->rateLimiter->check( $category, $client_ip );
			} catch ( \Throwable $t ) { // phpcs:ignore Generic.CodeAnalysis.EmptyStatement.DetectedCatch -- fail-open: rate-limiter throw passes through to WordPress.
				return;
			}
		} else {
			try {
				$decision = $this->rateLimiter->check( $category, $client_ip );
			} catch ( \Exception $e ) { // phpcs:ignore Generic.CodeAnalysis.EmptyStatement.DetectedCatch -- fail-open: rate-limiter throw passes through to WordPress.
				return;
			}
		}

		// What gets recorded is what actually happens, not what was decided.
		// Claiming the response settles both ways a refusal can be dropped, and
		// a dropped one goes on to reach WordPress.
		$effective = $decision;
		if ( ! $decision->isAllowed() && ! $this->responder->claimResponse( $decision ) ) {
			$effective = RateLimitDecision::allow();
		}

		if ( null !== $this->dailyCounter ) {
			if ( interface_exists( 'Throwable' ) ) {
				try {
					$this->dailyCounter->recordDecision( $effective );
				} catch ( \Throwable $t ) { // phpcs:ignore Generic.CodeAnalysis.EmptyStatement.DetectedCatch -- telemetry failure is non-fatal.
					unset( $t );
				}
			} else {
				try {
					$this->dailyCounter->recordDecision( $effective );
				} catch ( \Exception $e ) { // phpcs:ignore Generic.CodeAnalysis.EmptyStatement.DetectedCatch -- telemetry failure is non-fatal.
					unset( $e );
				}
			}
		}

		// Every classified request, humans included — their one aggregate row
		// per hour powers the dashboard's "Human visitors" figure (allowlisted
		// requests were recorded and returned earlier). ALLOW verdicts are recorded too,
		// unlike the blocked-only DailyCounter. Recorded inline rather than
		// deferred to shutdown: each write is a single indexed upsert
		// (sub-millisecond), and running before respond() keeps it inside the
		// request's normal error handling instead of the shutdown phase, where
		// a fatal cannot be reported and object-cache backends may already be
		// torn down.
		$this->recordStats(
			$category,
			$classification->getBot(),
			$client_ip,
			$effective->getAction()
		);

		$this->responder->respond( $decision );
	}

	/**
	 * What the steps read from the request: the matcher context, the protocol and whether
	 * the honeypot was hit.
	 *
	 * @since 4.1.4
	 *
	 * @param array $server $_SERVER snapshot.
	 * @return array
	 */
	private function readRequest( $server ) {
		$uri         = isset( $server['REQUEST_URI'] ) ? (string) $server['REQUEST_URI'] : '';
		$remote_addr = isset( $server['REMOTE_ADDR'] ) ? (string) $server['REMOTE_ADDR'] : '';
		$protocol    = isset( $server['SERVER_PROTOCOL'] ) ? (string) $server['SERVER_PROTOCOL'] : '';
		$ua          = isset( $server['HTTP_USER_AGENT'] ) ? (string) $server['HTTP_USER_AGENT'] : '';
		$script_name = isset( $server['SCRIPT_NAME'] ) ? (string) $server['SCRIPT_NAME'] : '';
		$headers     = self::extractHeaders( $server );

		// Resolve the real client IP once, up front. All downstream
		// consumers — whitelist, allowlist, rate limiter — must see the
		// same anti-spoofed address, otherwise CDN-fronted sites either
		// throttle every visitor onto the edge IP's counter or trust a
		// spoofed header. Classifier still takes REMOTE_ADDR because it
		// runs its own internal resolution (shares this resolver).
		$client_ip = $this->realIpResolver->resolve( $headers, $remote_addr );

		$base_path = Honeypot::basePathFromScriptName( $script_name );

		// remote_addr is carried alongside the resolved ip on purpose:
		// SameServerMatcher must compare against REMOTE_ADDR rather than the
		// resolved address, which can come out of a request header. REMOTE_ADDR
		// is not beyond reach either — mod_remoteip and nginx's realip module
		// rewrite it — but where trusted-proxy config is correct, an external
		// request either arrives with a non-local REMOTE_ADDR or still carries
		// a non-local hop in its forwarding chain. Header names are lower-cased
		// by extractHeaders(), which is the contract matchers rely on.
		return array(
			'context'  => array(
				'uri'         => $uri,
				'base_path'   => $base_path,
				'headers'     => $headers,
				'ip'          => $client_ip,
				'remote_addr' => $remote_addr,
				'ua'          => $ua,
				'script_name' => $script_name,
			),
			'protocol' => $protocol,
			'honeypot' => Honeypot::isTriggered( $uri, $base_path ),
		);
	}

	/**
	 * Steps 2 and 3: the IP allowlist first, so an allowlisted IP is allowed even on a
	 * honeypot path, then the request allowlist unless the honeypot was hit.
	 *
	 * @since 4.1.4
	 *
	 * @param array $request Output of readRequest().
	 * @return AllowlistMatch|null
	 */
	private function matchAllowlist( $request ) {
		$ip_match = $this->matchIp( $request['context']['ip'] );
		if ( null !== $ip_match ) {
			return $ip_match;
		}
		return $request['honeypot'] ? null : $this->allowlist->match( $request['context'] );
	}

	/**
	 * The IP allowlist entry that covers the resolved client IP: the
	 * Imunify360 local whitelist first, then the site owner's IP entries.
	 *
	 * Each source is guarded on its own rather than relying on run()'s outer
	 * catch: a failing source must leave the request to the other one and then
	 * to the classifier and the rate limiter, not skip them. So a throw reads
	 * as "no match" — an allowlist can never widen what gets through.
	 *
	 * @since 4.1.4
	 *
	 * @param string $client_ip Anti-spoofed client IP.
	 * @return AllowlistMatch|null
	 */
	private function matchIp( $client_ip ) {
		$whitelist = $this->ipWhitelist;
		$match     = null === $whitelist ? null : $this->guardMatch(
			function () use ( $whitelist, $client_ip ) {
				return $whitelist->match( $client_ip );
			}
		);
		if ( null !== $match || null === $this->siteAllowlist ) {
			return $match;
		}
		$site = $this->siteAllowlist;
		return $this->guardMatch(
			function () use ( $site, $client_ip ) {
				return $site->matchIp( $client_ip );
			}
		);
	}

	/**
	 * Run one allowlist lookup; a throw (including a PHP 7+ Error) or any
	 * other result than a match reads as no match.
	 *
	 * @since 4.1.4
	 *
	 * @param callable $fn Lookup returning AllowlistMatch|null.
	 * @return AllowlistMatch|null
	 */
	private function guardMatch( $fn ) {
		if ( interface_exists( 'Throwable' ) ) {
			try {
				$match = call_user_func( $fn );
			} catch ( \Throwable $t ) {
				unset( $t );
				return null;
			}
		} else {
			try {
				$match = call_user_func( $fn );
			} catch ( \Exception $e ) {
				unset( $e );
				return null;
			}
		}
		return $match instanceof AllowlistMatch ? $match : null;
	}

	/**
	 * Record an allowlisted request in both stats storages.
	 *
	 * Allowlisted requests return before classification, so the request
	 * would otherwise be invisible in the dashboard. They are never rate
	 * limited, hence the fixed ALLOW verdict, and the match type stands in
	 * the `bot` field because no classifier ran. The per-IP row is kept —
	 * unlike for humans — for the daily export and support queries.
	 *
	 * @since 4.1.4
	 *
	 * @param AllowlistMatch $match     The rule that let the request through.
	 * @param string         $client_ip Anti-spoofed client IP.
	 * @return void
	 */
	private function recordAllowlisted( AllowlistMatch $match, $client_ip ) {
		$this->recordStats(
			Category::WHITELISTED,
			$match->type(),
			$client_ip,
			RateLimitDecision::ACTION_ALLOW
		);
	}

	/**
	 * Record one classified request in both stats storages.
	 *
	 * Attached storages are optional, so either write may be a no-op. The
	 * per-IP row is skipped for humans: the drill-down it feeds is bot-only,
	 * and a per-visitor row per hour would dwarf every other category.
	 * Both writes are guarded independently so one failing never skips the
	 * other, and neither can defeat the visitor's response.
	 *
	 * @param string $category  Category value.
	 * @param string $bot       Signature slug, or '' when no bot was named.
	 * @param string $client_ip Anti-spoofed client IP.
	 * @param string $verdict   RateLimitDecision ACTION_* value.
	 * @return void
	 */
	private function recordStats( $category, $bot, $client_ip, $verdict ) {
		if ( null !== $this->statsStorage ) {
			$stats = $this->statsStorage;
			$this->guardTelemetry(
				function () use ( $stats, $category, $bot, $verdict ) {
					$stats->record( $category, $bot, $verdict );
				}
			);
		}
		if ( null !== $this->ipStatsStorage && Category::HUMAN !== $category ) {
			$ip_stats = $this->ipStatsStorage;
			$this->guardTelemetry(
				function () use ( $ip_stats, $category, $bot, $client_ip, $verdict ) {
					$ip_stats->record( $category, $bot, $client_ip, $verdict );
				}
			);
		}
	}

	/**
	 * Run best-effort telemetry under a fail-open guard: any throw (including
	 * a PHP 7+ Error from the storage layer) is swallowed so capture can never
	 * defeat the visitor's response. Called once per storage so a failure in
	 * one write does not skip the other.
	 *
	 * @param callable $fn Telemetry write to attempt.
	 * @return void
	 */
	private function guardTelemetry( $fn ) {
		if ( interface_exists( 'Throwable' ) ) {
			try {
				call_user_func( $fn );
			} catch ( \Throwable $t ) { // phpcs:ignore Generic.CodeAnalysis.EmptyStatement.DetectedCatch -- telemetry failure is non-fatal.
				unset( $t );
			}
		} else {
			try {
				call_user_func( $fn );
			} catch ( \Exception $e ) { // phpcs:ignore Generic.CodeAnalysis.EmptyStatement.DetectedCatch -- telemetry failure is non-fatal.
				unset( $e );
			}
		}
	}

	/**
	 * Reconstruct a case-preserving header map from $_SERVER.
	 *
	 * PHP exposes request headers as HTTP_* keys. We lower-case the
	 * suffix and replace underscores with dashes so downstream code
	 * sees "user-agent" / "cf-connecting-ip" the way RealIpResolver and
	 * Classifier expect.
	 *
	 * @param array $server Raw $_SERVER.
	 * @return array
	 */
	private static function extractHeaders( $server ) {
		$out = array();
		foreach ( $server as $key => $value ) {
			if ( ! is_string( $key ) ) {
				continue;
			}
			if ( 0 === strpos( $key, 'HTTP_' ) ) {
				$name         = strtolower( str_replace( '_', '-', substr( $key, 5 ) ) );
				$out[ $name ] = is_scalar( $value ) ? (string) $value : '';
			}
		}
		return $out;
	}
}

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