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| 1 | <?php declare(strict_types=1); |
| 2 | |
| 3 | /** |
| 4 | * PrivateBin |
| 5 | * |
| 6 | * a zero-knowledge paste bin |
| 7 | * |
| 8 | * @link https://github.com/PrivateBin/PrivateBin |
| 9 | * @copyright 2012 Sébastien SAUVAGE (sebsauvage.net) |
| 10 | * @license https://www.opensource.org/licenses/zlib-license.php The zlib/libpng License |
| 11 | */ |
| 12 | |
| 13 | namespace PrivateBin\Persistence; |
| 14 | |
| 15 | use Exception; |
| 16 | use IPLib\Factory; |
| 17 | use IPLib\ParseStringFlag; |
| 18 | use PrivateBin\Configuration; |
| 19 | use PrivateBin\I18n; |
| 20 | |
| 21 | /** |
| 22 | * TrafficLimiter |
| 23 | * |
| 24 | * Handles traffic limiting, so no user does more than one call per 10 seconds. |
| 25 | */ |
| 26 | class TrafficLimiter extends AbstractPersistence |
| 27 | { |
| 28 | /** |
| 29 | * listed IPs are the only ones allowed to create, defaults to null |
| 30 | * |
| 31 | * @access private |
| 32 | * @static |
| 33 | * @var string|null |
| 34 | */ |
| 35 | private static $_creators = null; |
| 36 | |
| 37 | /** |
| 38 | * listed IPs are exempted from limits, defaults to null |
| 39 | * |
| 40 | * @access private |
| 41 | * @static |
| 42 | * @var string|null |
| 43 | */ |
| 44 | private static $_exempted = null; |
| 45 | |
| 46 | /** |
| 47 | * key to fetch IP address |
| 48 | * |
| 49 | * @access private |
| 50 | * @static |
| 51 | * @var string |
| 52 | */ |
| 53 | private static $_ipKey = 'REMOTE_ADDR'; |
| 54 | |
| 55 | /** |
| 56 | * time limit in seconds, defaults to 10s |
| 57 | * |
| 58 | * @access private |
| 59 | * @static |
| 60 | * @var int |
| 61 | */ |
| 62 | private static $_limit = 10; |
| 63 | |
| 64 | /** |
| 65 | * set configuration options of the traffic limiter |
| 66 | * |
| 67 | * @access public |
| 68 | * @static |
| 69 | * @param Configuration $conf |
| 70 | */ |
| 71 | public static function setConfiguration(Configuration $conf) |
| 72 | { |
| 73 | self::setCreators($conf->getKey('creators', 'traffic')); |
| 74 | self::setExempted($conf->getKey('exempted', 'traffic')); |
| 75 | self::setLimit($conf->getKey('limit', 'traffic')); |
| 76 | |
| 77 | if (($option = $conf->getKey('header', 'traffic')) !== '') { |
| 78 | $httpHeader = 'HTTP_' . $option; |
| 79 | if (array_key_exists($httpHeader, $_SERVER) && !empty($_SERVER[$httpHeader])) { |
| 80 | self::$_ipKey = $httpHeader; |
| 81 | } |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * set a list of creator IP(-ranges) as string |
| 87 | * |
| 88 | * @access public |
| 89 | * @static |
| 90 | * @param string $creators |
| 91 | */ |
| 92 | public static function setCreators($creators) |
| 93 | { |
| 94 | self::$_creators = $creators; |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * set a list of exempted IP(-ranges) as string |
| 99 | * |
| 100 | * @access public |
| 101 | * @static |
| 102 | * @param string $exempted |
| 103 | */ |
| 104 | public static function setExempted($exempted) |
| 105 | { |
| 106 | self::$_exempted = $exempted; |
| 107 | } |
| 108 | |
| 109 | /** |
| 110 | * set the time limit in seconds |
| 111 | * |
| 112 | * @access public |
| 113 | * @static |
| 114 | * @param int $limit |
| 115 | */ |
| 116 | public static function setLimit($limit) |
| 117 | { |
| 118 | self::$_limit = $limit; |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * get a HMAC of the current visitors IP address |
| 123 | * |
| 124 | * @access public |
| 125 | * @static |
| 126 | * @param string $algo |
| 127 | * @return string |
| 128 | */ |
| 129 | public static function getHash($algo = 'sha512') |
| 130 | { |
| 131 | return hash_hmac($algo, $_SERVER[self::$_ipKey], ServerSalt::get()); |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * validate $_ipKey against configured ipranges. If matched we will ignore the ip |
| 136 | * |
| 137 | * @access private |
| 138 | * @static |
| 139 | * @param string $ipRange |
| 140 | * @return bool |
| 141 | */ |
| 142 | private static function matchIp($ipRange = null) |
| 143 | { |
| 144 | if (is_string($ipRange)) { |
| 145 | $ipRange = trim($ipRange); |
| 146 | } |
| 147 | $address = Factory::parseAddressString($_SERVER[self::$_ipKey]); |
| 148 | $range = Factory::parseRangeString( |
| 149 | $ipRange, |
| 150 | ParseStringFlag::IPV4_MAYBE_NON_DECIMAL | ParseStringFlag::IPV4SUBNET_MAYBE_COMPACT | ParseStringFlag::IPV4ADDRESS_MAYBE_NON_QUAD_DOTTED |
| 151 | ); |
| 152 | |
| 153 | // address could not be parsed, we might not be in IP space and try a string comparison instead |
| 154 | if (is_null($address)) { |
| 155 | return $_SERVER[self::$_ipKey] === $ipRange; |
| 156 | } |
| 157 | // range could not be parsed, possibly an invalid ip range given in config |
| 158 | if (is_null($range)) { |
| 159 | return false; |
| 160 | } |
| 161 | |
| 162 | return $address->matches($range); |
| 163 | } |
| 164 | |
| 165 | /** |
| 166 | * make sure the IP address is allowed to perfom a request |
| 167 | * |
| 168 | * @access public |
| 169 | * @static |
| 170 | * @throws Exception |
| 171 | * @return true |
| 172 | */ |
| 173 | public static function canPass() |
| 174 | { |
| 175 | // if creators are defined, the traffic limiter will only allow creation |
| 176 | // for these, with no limits, and skip any other rules |
| 177 | if (!empty(self::$_creators)) { |
| 178 | $creatorIps = explode(',', self::$_creators); |
| 179 | foreach ($creatorIps as $ipRange) { |
| 180 | if (self::matchIp($ipRange) === true) { |
| 181 | return true; |
| 182 | } |
| 183 | } |
| 184 | throw new Exception(I18n::_('Your IP is not authorized to create pastes.')); |
| 185 | } |
| 186 | |
| 187 | // disable limits if set to less then 1 |
| 188 | if (self::$_limit < 1) { |
| 189 | return true; |
| 190 | } |
| 191 | |
| 192 | // check if $_ipKey is exempted from ratelimiting |
| 193 | if (!empty(self::$_exempted)) { |
| 194 | $exIp_array = explode(',', self::$_exempted); |
| 195 | foreach ($exIp_array as $ipRange) { |
| 196 | if (self::matchIp($ipRange) === true) { |
| 197 | return true; |
| 198 | } |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | // used as array key, which are limited in length, hence using algo with shorter range |
| 203 | $hash = self::getHash('sha256'); |
| 204 | $now = time(); |
| 205 | $tl = (int) self::$_store->getValue('traffic_limiter', $hash); |
| 206 | self::$_store->purgeValues('traffic_limiter', $now - self::$_limit); |
| 207 | if ($tl > 0 && ($tl + self::$_limit >= $now)) { |
| 208 | $result = false; |
| 209 | } else { |
| 210 | $tl = time(); |
| 211 | $result = true; |
| 212 | } |
| 213 | if (!self::$_store->setValue((string) $tl, 'traffic_limiter', $hash)) { |
| 214 | error_log('failed to store the traffic limiter, it probably contains outdated information'); |
| 215 | } |
| 216 | if ($result) { |
| 217 | return true; |
| 218 | } |
| 219 | throw new Exception(I18n::_( |
| 220 | 'Please wait %d seconds between each post.', |
| 221 | self::$_limit |
| 222 | )); |
| 223 | } |
| 224 | } |