shared-functions.php
| 1 | <?php |
| 2 | /** |
| 3 | * These functions are shared by the Protect module and its related json-endpoints |
| 4 | */ |
| 5 | /** |
| 6 | * Returns an array of IP objects that will never be blocked by the Protect module |
| 7 | * |
| 8 | * The array is segmented into a local whitelist which applies only to the current site |
| 9 | * and a global whitelist which, for multisite installs, applies to the entire networko |
| 10 | * |
| 11 | * @return array |
| 12 | */ |
| 13 | function jetpack_protect_format_whitelist() { |
| 14 | $local_whitelist = jetpack_protect_get_local_whitelist(); |
| 15 | $formatted = array( |
| 16 | 'local' => array(), |
| 17 | ); |
| 18 | foreach ( $local_whitelist as $item ) { |
| 19 | if ( $item->range ) { |
| 20 | $formatted['local'][] = $item->range_low . ' - ' . $item->range_high; |
| 21 | } else { |
| 22 | $formatted['local'][] = $item->ip_address; |
| 23 | } |
| 24 | } |
| 25 | if ( is_multisite() && current_user_can( 'manage_network' ) ) { |
| 26 | $formatted['global'] = array(); |
| 27 | $global_whitelist = jetpack_protect_get_global_whitelist(); |
| 28 | if ( false === $global_whitelist ) { |
| 29 | // If the global whitelist has never been set, check for a legacy option set prior to 3.6. |
| 30 | $global_whitelist = get_site_option( 'jetpack_protect_whitelist', array() ); |
| 31 | } |
| 32 | foreach ( $global_whitelist as $item ) { |
| 33 | if ( $item->range ) { |
| 34 | $formatted['global'][] = $item->range_low . ' - ' . $item->range_high; |
| 35 | } else { |
| 36 | $formatted['global'][] = $item->ip_address; |
| 37 | } |
| 38 | } |
| 39 | } |
| 40 | return $formatted; |
| 41 | } |
| 42 | /** |
| 43 | * Gets the local Protect whitelist |
| 44 | * |
| 45 | * The 'local' part of the whitelist only really applies to multisite installs, |
| 46 | * which can have a network wide whitelist, as well as a local list that applies |
| 47 | * only to the current site. On single site installs, there will only be a local |
| 48 | * whitelist. |
| 49 | * |
| 50 | * @return array A list of IP Address objects or an empty array |
| 51 | */ |
| 52 | function jetpack_protect_get_local_whitelist() { |
| 53 | $whitelist = Jetpack_Options::get_option( 'protect_whitelist' ); |
| 54 | if ( false === $whitelist ) { |
| 55 | // The local whitelist has never been set. |
| 56 | if ( is_multisite() ) { |
| 57 | // On a multisite, we can check for a legacy site_option that existed prior to v 3.6, or default to an empty array. |
| 58 | $whitelist = get_site_option( 'jetpack_protect_whitelist', array() ); |
| 59 | } else { |
| 60 | // On a single site, we can just use an empty array. |
| 61 | $whitelist = array(); |
| 62 | } |
| 63 | } |
| 64 | return $whitelist; |
| 65 | } |
| 66 | |
| 67 | /** |
| 68 | * Get the global, network-wide whitelist |
| 69 | * |
| 70 | * It will revert to the legacy site_option if jetpack_protect_global_whitelist has never been set. |
| 71 | * |
| 72 | * @return array |
| 73 | */ |
| 74 | function jetpack_protect_get_global_whitelist() { |
| 75 | $whitelist = get_site_option( 'jetpack_protect_global_whitelist' ); |
| 76 | if ( false === $whitelist ) { |
| 77 | // The global whitelist has never been set. Check for legacy site_option, or default to an empty array. |
| 78 | $whitelist = get_site_option( 'jetpack_protect_whitelist', array() ); |
| 79 | } |
| 80 | return $whitelist; |
| 81 | } |
| 82 | |
| 83 | /** |
| 84 | * Jetpack Protect Save Whitelist. |
| 85 | * |
| 86 | * @access public |
| 87 | * @param mixed $whitelist Whitelist. |
| 88 | * @param bool $global (default: false) Global. |
| 89 | * @return Bool. |
| 90 | */ |
| 91 | function jetpack_protect_save_whitelist( $whitelist, $global = false ) { |
| 92 | $whitelist_error = false; |
| 93 | $new_items = array(); |
| 94 | if ( ! is_array( $whitelist ) ) { |
| 95 | return new WP_Error( 'invalid_parameters', __( 'Expecting an array', 'jetpack' ) ); |
| 96 | } |
| 97 | if ( $global && ! is_multisite() ) { |
| 98 | return new WP_Error( 'invalid_parameters', __( 'Cannot use global flag on non-multisites', 'jetpack' ) ); |
| 99 | } |
| 100 | if ( $global && ! current_user_can( 'manage_network' ) ) { |
| 101 | return new WP_Error( 'permission_denied', __( 'Only super admins can edit the global whitelist', 'jetpack' ) ); |
| 102 | } |
| 103 | // Validate each item. |
| 104 | foreach ( $whitelist as $item ) { |
| 105 | $item = trim( $item ); |
| 106 | if ( empty( $item ) ) { |
| 107 | continue; |
| 108 | } |
| 109 | $range = false; |
| 110 | if ( strpos( $item, '-' ) ) { |
| 111 | $item = explode( '-', $item ); |
| 112 | $range = true; |
| 113 | } |
| 114 | $new_item = new stdClass(); |
| 115 | $new_item->range = $range; |
| 116 | if ( ! empty( $range ) ) { |
| 117 | $low = trim( $item[0] ); |
| 118 | $high = trim( $item[1] ); |
| 119 | if ( ! filter_var( $low, FILTER_VALIDATE_IP ) || ! filter_var( $high, FILTER_VALIDATE_IP ) ) { |
| 120 | $whitelist_error = true; |
| 121 | break; |
| 122 | } |
| 123 | if ( ! jetpack_convert_ip_address( $low ) || ! jetpack_convert_ip_address( $high ) ) { |
| 124 | $whitelist_error = true; |
| 125 | break; |
| 126 | } |
| 127 | $new_item->range_low = $low; |
| 128 | $new_item->range_high = $high; |
| 129 | } else { |
| 130 | if ( ! filter_var( $item, FILTER_VALIDATE_IP ) ) { |
| 131 | $whitelist_error = true; |
| 132 | break; |
| 133 | } |
| 134 | if ( ! jetpack_convert_ip_address( $item ) ) { |
| 135 | $whitelist_error = true; |
| 136 | break; |
| 137 | } |
| 138 | $new_item->ip_address = $item; |
| 139 | } |
| 140 | $new_items[] = $new_item; |
| 141 | } // End item loop. |
| 142 | if ( ! empty( $whitelist_error ) ) { |
| 143 | return new WP_Error( 'invalid_ip', __( 'One of your IP addresses was not valid.', 'jetpack' ) ); |
| 144 | } |
| 145 | if ( $global ) { |
| 146 | update_site_option( 'jetpack_protect_global_whitelist', $new_items ); |
| 147 | // Once a user has saved their global whitelist, we can permanently remove the legacy option. |
| 148 | delete_site_option( 'jetpack_protect_whitelist' ); |
| 149 | } else { |
| 150 | Jetpack_Options::update_option( 'protect_whitelist', $new_items ); |
| 151 | } |
| 152 | return true; |
| 153 | } |
| 154 | |
| 155 | /** |
| 156 | * Jetpack Protect Get IP. |
| 157 | * |
| 158 | * @access public |
| 159 | * @return string|false IP. |
| 160 | */ |
| 161 | function jetpack_protect_get_ip() { |
| 162 | $trusted_header_data = get_site_option( 'trusted_ip_header' ); |
| 163 | if ( isset( $trusted_header_data->trusted_header ) && isset( $_SERVER[ $trusted_header_data->trusted_header ] ) ) { |
| 164 | $ip = $_SERVER[ $trusted_header_data->trusted_header ]; |
| 165 | $segments = $trusted_header_data->segments; |
| 166 | $reverse_order = $trusted_header_data->reverse; |
| 167 | } else { |
| 168 | $ip = $_SERVER['REMOTE_ADDR']; |
| 169 | } |
| 170 | |
| 171 | if ( ! $ip ) { |
| 172 | return false; |
| 173 | } |
| 174 | |
| 175 | $ips = explode( ',', $ip ); |
| 176 | if ( ! isset( $segments ) || ! $segments ) { |
| 177 | $segments = 1; |
| 178 | } |
| 179 | if ( isset( $reverse_order ) && $reverse_order ) { |
| 180 | $ips = array_reverse( $ips ); |
| 181 | } |
| 182 | $ip_count = count( $ips ); |
| 183 | if ( 1 === $ip_count ) { |
| 184 | return jetpack_clean_ip( $ips[0] ); |
| 185 | } elseif ( $ip_count >= $segments ) { |
| 186 | $the_one = $ip_count - $segments; |
| 187 | return jetpack_clean_ip( $ips[ $the_one ] ); |
| 188 | } else { |
| 189 | return jetpack_clean_ip( $_SERVER['REMOTE_ADDR'] ); |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | /** |
| 194 | * Jetpack Clean IP. |
| 195 | * |
| 196 | * @access public |
| 197 | * @param string $ip IP. |
| 198 | * @return string|false IP. |
| 199 | */ |
| 200 | function jetpack_clean_ip( $ip ) { |
| 201 | |
| 202 | // Some misconfigured servers give back extra info, which comes after "unless". |
| 203 | $ips = explode( ' unless ', $ip ); |
| 204 | $ip = $ips[0]; |
| 205 | |
| 206 | $ip = strtolower( trim( $ip ) ); |
| 207 | |
| 208 | // Check for IPv4 with port. |
| 209 | if ( preg_match( '/^(\d+\.\d+\.\d+\.\d+):\d+$/', $ip, $matches ) ) { |
| 210 | $ip = $matches[1]; |
| 211 | } |
| 212 | |
| 213 | // Check for IPv6 (or IPvFuture) with brackets and optional port. |
| 214 | if ( preg_match( '/^\[([a-z0-9\-._~!$&\'()*+,;=:]+)\](?::\d+)?$/', $ip, $matches ) ) { |
| 215 | $ip = $matches[1]; |
| 216 | } |
| 217 | |
| 218 | // Check for IPv4 IP cast as IPv6. |
| 219 | if ( preg_match( '/^::ffff:(\d+\.\d+\.\d+\.\d+)$/', $ip, $matches ) ) { |
| 220 | $ip = $matches[1]; |
| 221 | } |
| 222 | |
| 223 | // Validate and return. |
| 224 | return filter_var( $ip, FILTER_VALIDATE_IP ) ? $ip : false; |
| 225 | } |
| 226 | |
| 227 | /** |
| 228 | * Checks an IP to see if it is within a private range. |
| 229 | * |
| 230 | * @param int $ip IP. |
| 231 | * @return bool |
| 232 | */ |
| 233 | function jetpack_protect_ip_is_private( $ip ) { |
| 234 | // We are dealing with ipv6, so we can simply rely on filter_var. |
| 235 | if ( false === strpos( $ip, '.' ) ) { |
| 236 | return ! filter_var( $ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE ); |
| 237 | } |
| 238 | // We are dealing with ipv4. |
| 239 | $private_ip4_addresses = array( |
| 240 | '10.0.0.0|10.255.255.255', // Single class A network. |
| 241 | '172.16.0.0|172.31.255.255', // 16 contiguous class B network. |
| 242 | '192.168.0.0|192.168.255.255', // 256 contiguous class C network. |
| 243 | '169.254.0.0|169.254.255.255', // Link-local address also referred to as Automatic Private IP Addressing. |
| 244 | '127.0.0.0|127.255.255.255', // localhost. |
| 245 | ); |
| 246 | $long_ip = ip2long( $ip ); |
| 247 | if ( -1 !== $long_ip ) { |
| 248 | foreach ( $private_ip4_addresses as $pri_addr ) { |
| 249 | list ( $start, $end ) = explode( '|', $pri_addr ); |
| 250 | if ( $long_ip >= ip2long( $start ) && $long_ip <= ip2long( $end ) ) { |
| 251 | return true; |
| 252 | } |
| 253 | } |
| 254 | } |
| 255 | return false; |
| 256 | } |
| 257 | |
| 258 | /** |
| 259 | * Uses inet_pton if available to convert an IP address to a binary string. |
| 260 | * If inet_pton is not available, ip2long will convert the address to an integer. |
| 261 | * Returns false if an invalid IP address is given. |
| 262 | * |
| 263 | * NOTE: ip2long will return false for any ipv6 address. servers that do not support |
| 264 | * inet_pton will not support ipv6 |
| 265 | * |
| 266 | * @access public |
| 267 | * @param mixed $ip IP. |
| 268 | * @return int|string|bool |
| 269 | */ |
| 270 | function jetpack_convert_ip_address( $ip ) { |
| 271 | if ( function_exists( 'inet_pton' ) ) { |
| 272 | return inet_pton( $ip ); |
| 273 | } |
| 274 | return ip2long( $ip ); |
| 275 | } |
| 276 | |
| 277 | /** |
| 278 | * Checks that a given IP address is within a given low - high range. |
| 279 | * Servers that support inet_pton will use that function to convert the ip to number, |
| 280 | * while other servers will use ip2long. |
| 281 | * |
| 282 | * NOTE: servers that do not support inet_pton cannot support ipv6. |
| 283 | * |
| 284 | * @access public |
| 285 | * @param mixed $ip IP. |
| 286 | * @param mixed $range_low Range Low. |
| 287 | * @param mixed $range_high Range High. |
| 288 | * @return Bool. |
| 289 | */ |
| 290 | function jetpack_protect_ip_address_is_in_range( $ip, $range_low, $range_high ) { |
| 291 | // The inet_pton will give us binary string of an ipv4 or ipv6. |
| 292 | // We can then use strcmp to see if the address is in range. |
| 293 | if ( function_exists( 'inet_pton' ) ) { |
| 294 | $ip_num = inet_pton( $ip ); |
| 295 | $ip_low = inet_pton( $range_low ); |
| 296 | $ip_high = inet_pton( $range_high ); |
| 297 | if ( $ip_num && $ip_low && $ip_high && strcmp( $ip_num, $ip_low ) >= 0 && strcmp( $ip_num, $ip_high ) <= 0 ) { |
| 298 | return true; |
| 299 | } |
| 300 | // The ip2long will give us an integer of an ipv4 address only. it will produce FALSE for ipv6. |
| 301 | } else { |
| 302 | $ip_num = ip2long( $ip ); |
| 303 | $ip_low = ip2long( $range_low ); |
| 304 | $ip_high = ip2long( $range_high ); |
| 305 | if ( $ip_num && $ip_low && $ip_high && $ip_num >= $ip_low && $ip_num <= $ip_high ) { |
| 306 | return true; |
| 307 | } |
| 308 | } |
| 309 | return false; |
| 310 | } |
| 311 |