← All changes | media-optimization/class-dimension-injector.php +82 -8 2.6.18 → 2.7.2 View file →

		@@ -23,8 +23,17 @@
23	23
24	24	/** How long resolved dimensions stay cached, in seconds (7 days). */
25	25	private const CACHE_TTL = 604800;
26	26
	27	+ /** Transient key prefix for failed remote lookups (negative cache). */
	28	+ private const FAIL_PREFIX = 'ms_dimfail_';
	29	+
	30	+ /** How long a failed remote lookup stays cached, in seconds (1 hour). */
	31	+ private const FAIL_TTL = 3600;
	32	+
	33	+ /** Cap on bytes fetched from a remote image header sniff. */
	34	+ private const REMOTE_MAX_BYTES = 65536;
	35	+
27	36	public function __construct() {
28	37	add_filter('the_content', [$this, 'inject_dimensions'], 30);
29	38	add_filter('post_thumbnail_html', [$this, 'inject_dimensions'], 30);
30	39	add_filter('widget_text', [$this, 'inject_dimensions'], 30);
		@@ -33,9 +42,9 @@
33	42	/**
34	43	* Find <img> tags missing width or height and inject dimensions.
35	44	*/
36	45	public function inject_dimensions(string $content): string {
37		- if (empty($content) || is_admin()) {
	46	+ if (empty($content) || is_admin() || is_feed()) {
38	47	return $content;
39	48	}
40	49
41	50	return preg_replace_callback('/<img\s[^>]+>/i', function ($matches) {
		@@ -251,8 +260,17 @@
251	260	}
252	261	}
253	262	}
254	263
	264	+ // A sized variant with no registered sub-size (crop added after
	265	+ // upload, third-party sizes) must not inherit the FULL-size
	266	+ // dimensions — wrong width/height re-introduces the very layout
	267	+ // shift this module exists to prevent. Leaving the tag alone is
	268	+ // safer than injecting wrong values.
	269	+ if (preg_match('/-\d+x\d+(?=\.\w+$)/', wp_basename($url))) {
	270	+ return null;
	271	+ }
	272	+
255	273	// Fall back to full size
256	274	if (!empty($meta['width']) && !empty($meta['height'])) {
257	275	return [
258	276	'width' => (int) $meta['width'],
		@@ -290,25 +308,39 @@
290	308
291	309	/**
292	310	* Fetch dimensions from a remote URL.
293	311	* Downloads just enough bytes to read image headers.
	312	+ *
	313	+ * Server-side fetching of arbitrary <img src> values is an SSRF vector:
	314	+ * content authors can plant internal, localhost, or cloud-metadata URLs
	315	+ * that this server would otherwise probe on every pageview. Remote
	316	+ * fetching is therefore opt-in — it only runs for hosts allowlisted via
	317	+ * the 'metasync_dimension_remote_hosts' filter — and failures are
	318	+ * negatively cached so they are not re-fetched on every request.
294	319	*/
295	320	private function get_dims_from_remote(string $url): ?array {
296		- if (strpos($url, 'http') !== 0) {
	321	+ if (!$this->is_remote_fetch_allowed($url)) {
297	322	return null;
298	323	}
299	324
	325	+ $fail_key = self::FAIL_PREFIX . md5($url);
	326	+ if (get_transient($fail_key) !== false) {
	327	+ return null;
	328	+ }
	329	+
300	330	$response = wp_remote_get($url, [
301		- 'timeout' => 3,
302		- 'headers' => ['Range' => 'bytes=0-32767'],
	331	+ 'timeout' => 3,
	332	+ 'headers' => ['Range' => 'bytes=0-' . (self::REMOTE_MAX_BYTES - 1)],
	333	+ 'limit_response_size' => self::REMOTE_MAX_BYTES,
303	334	]);
304	335
305		- if (is_wp_error($response)) {
306		- return null;
	336	+ $body = null;
	337	+ if (!is_wp_error($response)) {
	338	+ $body = wp_remote_retrieve_body($response);
307	339	}
308	340
309		- $body = wp_remote_retrieve_body($response);
310	341	if (empty($body)) {
	342	+ set_transient($fail_key, 1, self::FAIL_TTL);
311	343	return null;
312	344	}
313	345
314	346	if (!function_exists('wp_tempnam')) {
		@@ -317,15 +349,57 @@
317	349
318	350	$tmp = wp_tempnam($url);
319	351	file_put_contents($tmp, $body);
320	352	$info = @getimagesize($tmp);
321		- @unlink($tmp);
	353	+ @wp_delete_file($tmp);
322	354
323	355	if ($info && $info[0] > 0 && $info[1] > 0) {
324	356	return ['width' => $info[0], 'height' => $info[1]];
325	357	}
326	358
	359	+ set_transient($fail_key, 1, self::FAIL_TTL);
327	360	return null;
	361	+ }
	362	+
	363	+ /**
	364	+ * A remote URL may only be fetched when explicitly allowed.
	365	+ *
	366	+ * @param string $url Absolute image URL.
	367	+ * @return bool True when the scheme is http(s), the URL passes core's
	368	+ * internal-address validation, and its host is allowlisted.
	369	+ */
	370	+ private function is_remote_fetch_allowed(string $url): bool {
	371	+ /**
	372	+ * Hosts whose images may be fetched server-side for dimension
	373	+ * sniffing. Empty by default — remote dimension fetching is opt-in,
	374	+ * which closes the SSRF surface until a site owner explicitly
	375	+ * trusts specific hosts. Checked before any URL parsing so the
	376	+ * default (fetch-disabled) path stays cheap.
	377	+ *
	378	+ * @param string[] $allowed_hosts List of hostnames.
	379	+ */
	380	+ $allowed_hosts = apply_filters('metasync_dimension_remote_hosts', []);
	381	+ if (empty($allowed_hosts)) {
	382	+ return false;
	383	+ }
	384	+
	385	+ $scheme = wp_parse_url($url, PHP_URL_SCHEME);
	386	+ if (!in_array($scheme, ['http', 'https'], true)) {
	387	+ return false;
	388	+ }
	389	+
	390	+ if (!wp_http_validate_url($url)) {
	391	+ return false;
	392	+ }
	393	+
	394	+ $host = strtolower((string) wp_parse_url($url, PHP_URL_HOST));
	395	+ foreach ($allowed_hosts as $allowed) {
	396	+ if (strtolower((string) $allowed) === $host) {
	397	+ return true;
	398	+ }
	399	+ }
	400	+
	401	+ return false;
328	402	}
329	403
330	404	/**
331	405	* Insert an attribute into an <img> tag.