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| 1 | <?php |
| 2 | /** |
| 3 | * Status and information regarding the site visitor. |
| 4 | * |
| 5 | * @package automattic/jetpack-status |
| 6 | */ |
| 7 | |
| 8 | namespace Automattic\Jetpack\Status; |
| 9 | |
| 10 | use Automattic\Jetpack\IP\Utils as IP_Utils; |
| 11 | |
| 12 | /** |
| 13 | * Visitor class. |
| 14 | */ |
| 15 | class Visitor { |
| 16 | |
| 17 | /** |
| 18 | * Gets current user IP address. |
| 19 | * |
| 20 | * Only a value that parses as an IP address is returned. With `$check_all_headers`, the |
| 21 | * forwarded headers are tried in order, a comma-separated list yields its first valid entry, |
| 22 | * and a header holding no valid address is skipped. |
| 23 | * |
| 24 | * A site with a trusted header configured does not use that sweep at all. Brute force |
| 25 | * protection stores which header carries the visitor address, how far back to count in its |
| 26 | * list, and whether that list runs in reverse, all worked out for this site's own proxy |
| 27 | * setup. Once that answer exists it is the answer, including when the request did not carry |
| 28 | * the header — `IP\Utils::get_ip()` falls back to `REMOTE_ADDR` itself in that case. Reading |
| 29 | * the sweep afterwards would let a request that simply omits the trusted header pick its own |
| 30 | * address out of a header it fully controls, and would hand Jetpack two answers for one |
| 31 | * request, since brute force protection resolves the same visitor through `IP\Utils`. |
| 32 | * |
| 33 | * That is a guarantee about which source is consulted, not about the address itself: it |
| 34 | * still assumes the proxy named in the stored configuration rewrites the header. A request |
| 35 | * reaching the origin directly can present that header itself. |
| 36 | * |
| 37 | * The address is normalized by `IP\Utils::clean_ip()`: it is lowercased, anything following an |
| 38 | * " unless " separator is dropped, and a port suffix, IPv6 brackets, or an `::ffff:` IPv4 |
| 39 | * mapping are reduced to the bare address. Code comparing this value against a stored or |
| 40 | * configured address should normalize that address the same way. |
| 41 | * |
| 42 | * @param bool $check_all_headers Check all headers? Default is `false`. |
| 43 | * |
| 44 | * @return string Current user IP address, or an empty string if no valid address could be determined. |
| 45 | */ |
| 46 | public function get_ip( $check_all_headers = false ) { |
| 47 | if ( $check_all_headers ) { |
| 48 | $trusted_header_data = get_site_option( 'trusted_ip_header' ); |
| 49 | if ( isset( $trusted_header_data->trusted_header ) ) { |
| 50 | $trusted_ip = IP_Utils::get_ip(); |
| 51 | return false !== $trusted_ip ? $trusted_ip : ''; |
| 52 | } |
| 53 | |
| 54 | foreach ( array( |
| 55 | 'HTTP_CF_CONNECTING_IP', |
| 56 | 'HTTP_CLIENT_IP', |
| 57 | 'HTTP_X_FORWARDED_FOR', |
| 58 | 'HTTP_X_FORWARDED', |
| 59 | 'HTTP_X_CLUSTER_CLIENT_IP', |
| 60 | 'HTTP_FORWARDED_FOR', |
| 61 | 'HTTP_FORWARDED', |
| 62 | 'HTTP_VIA', |
| 63 | ) as $key ) { |
| 64 | if ( empty( $_SERVER[ $key ] ) ) { |
| 65 | continue; |
| 66 | } |
| 67 | // Proxies append to the list, so the leftmost entry is the client. |
| 68 | foreach ( explode( ',', (string) wp_unslash( $_SERVER[ $key ] ) ) as $candidate ) { // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- Each entry is validated by clean_ip() below. |
| 69 | $ip = IP_Utils::clean_ip( $candidate ); |
| 70 | if ( false !== $ip ) { |
| 71 | return $ip; |
| 72 | } |
| 73 | } |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | $ip = empty( $_SERVER['REMOTE_ADDR'] ) ? false : IP_Utils::clean_ip( wp_unslash( $_SERVER['REMOTE_ADDR'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- clean_ip() validates it. |
| 78 | return false !== $ip ? $ip : ''; |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * Simple gate check for a11n feature testing purposes using AT_PROXIED_REQUEST constant. |
| 83 | * IMPORTANT: Only use it for internal feature test purposes, not authorization. |
| 84 | * |
| 85 | * The goal of this function is to help us gate features by using a similar function name |
| 86 | * we find on simple sites: is_automattician(). |
| 87 | * |
| 88 | * @return bool True if the current request is PROXIED, false otherwise. |
| 89 | */ |
| 90 | public function is_automattician_feature_flags_only() { |
| 91 | return ( defined( 'AT_PROXIED_REQUEST' ) && AT_PROXIED_REQUEST ); |
| 92 | } |
| 93 | |
| 94 | /** |
| 95 | * Whether the current request should be attributed to an Automattician in analytics. |
| 96 | * |
| 97 | * True for an identified Automattician on WordPress.com Simple, and for A8C-proxied |
| 98 | * requests on both Simple and WoA. Use it to tag Tracks events as internal traffic so |
| 99 | * it can be filtered out of product reporting — this matters most for newly launched |
| 100 | * features, where a small amount of internal testing is a large share of the totals |
| 101 | * and there is no way to separate it after the fact. |
| 102 | * |
| 103 | * IMPORTANT: Reporting signal only, never authorization. A proxied request says |
| 104 | * something about where the request came from, not who the user is. |
| 105 | * |
| 106 | * @since 6.4.0 |
| 107 | * |
| 108 | * @return bool True if the request looks like Automattician traffic, false otherwise. |
| 109 | */ |
| 110 | public function is_tracking_automattician() { |
| 111 | // Identified Automattician on WordPress.com Simple. |
| 112 | if ( function_exists( 'is_automattician' ) && \is_automattician() ) { |
| 113 | return true; |
| 114 | } |
| 115 | |
| 116 | // Proxied A8C request on WordPress.com Simple. |
| 117 | if ( function_exists( 'wpcom_is_proxied_request' ) && \wpcom_is_proxied_request() ) { |
| 118 | return true; |
| 119 | } |
| 120 | |
| 121 | // Proxied A8C request on WoA. |
| 122 | return $this->is_automattician_feature_flags_only(); |
| 123 | } |
| 124 | } |