Copybara bot | be50d49 | 2023-11-30 00:16:42 +0100 | [diff] [blame] | 1 | <?php |
Adrià Vilanova Martínez | 5af8651 | 2023-12-02 20:44:16 +0100 | [diff] [blame^] | 2 | /* |
| 3 | * hores |
| 4 | * Copyright (c) 2023 Adrià Vilanova Martínez |
| 5 | * |
| 6 | * This program is free software: you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU Affero General Public License as |
| 8 | * published by the Free Software Foundation, either version 3 of the |
| 9 | * License, or (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU Affero General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Affero General Public |
| 17 | * License along with this program. |
| 18 | * If not, see http://www.gnu.org/licenses/. |
| 19 | */ |
| 20 | |
Copybara bot | be50d49 | 2023-11-30 00:16:42 +0100 | [diff] [blame] | 21 | require_once(__DIR__."/../lib/GoogleAuthenticator/GoogleAuthenticator.php"); |
| 22 | require_once(__DIR__."/../lib/WebAuthn/WebAuthn.php"); |
| 23 | |
| 24 | class secondFactor { |
| 25 | public static function isAvailable() { |
| 26 | global $conf; |
| 27 | return (($conf["secondFactor"]["enabled"] ?? false) === true); |
| 28 | } |
| 29 | |
| 30 | public static function checkAvailability() { |
| 31 | global $conf; |
| 32 | |
| 33 | if (!self::isAvailable()) { |
| 34 | security::notFound(); |
| 35 | } |
| 36 | } |
| 37 | |
| 38 | public static function isEnabled($person = "ME") { |
| 39 | if (!self::isAvailable()) return false; |
| 40 | return (people::userData("secondfactor", $person) == 1); |
| 41 | } |
| 42 | |
| 43 | public static function generateSecret() { |
| 44 | $authenticator = new GoogleAuthenticator(); |
| 45 | return $authenticator->generateSecret(); |
| 46 | } |
| 47 | |
| 48 | public static function isValidSecret($secret) { |
| 49 | return (strlen($secret) === 32); |
| 50 | } |
| 51 | |
| 52 | public static function checkCode($secret, $code) { |
| 53 | $authenticator = new GoogleAuthenticator(); |
| 54 | return $authenticator->checkCode($secret, $code); |
| 55 | } |
| 56 | |
| 57 | public static function checkPersonCode($person, $code) { |
| 58 | global $con; |
| 59 | |
| 60 | $sperson = (int)$person; |
| 61 | $query = mysqli_query($con, "SELECT secret FROM totp WHERE person = $sperson LIMIT 1"); |
| 62 | if ($query === false || !mysqli_num_rows($query)) return false; |
| 63 | |
| 64 | $row = mysqli_fetch_assoc($query); |
| 65 | |
| 66 | return self::checkCode($row["secret"], $code); |
| 67 | } |
| 68 | |
| 69 | public static function disable($person = "ME", $personDisable = true) { |
| 70 | global $con; |
| 71 | |
| 72 | if ($person == "ME") $person = people::userData("id"); |
| 73 | $sperson = (int)$person; |
| 74 | |
| 75 | return (mysqli_query($con, "DELETE FROM totp WHERE person = $sperson") && (!$personDisable || mysqli_query($con, "UPDATE people SET secondfactor = 0 WHERE id = $sperson LIMIT 1")) && mysqli_query($con, "DELETE FROM securitykeys WHERE person = $sperson")); |
| 76 | } |
| 77 | |
| 78 | public static function enable($secret, $person = "ME") { |
| 79 | global $con; |
| 80 | |
| 81 | if (!self::isValidSecret($secret)) return false; |
| 82 | |
| 83 | if ($person == "ME") $person = people::userData("id"); |
| 84 | |
| 85 | self::disable($person, false); |
| 86 | |
| 87 | $sperson = (int)$person; |
| 88 | $ssecret = db::sanitize($secret); |
| 89 | return (mysqli_query($con, "INSERT INTO totp (person, secret) VALUES ($sperson, '$ssecret')") && mysqli_query($con, "UPDATE people SET secondfactor = 1 WHERE id = $sperson LIMIT 1")); |
| 90 | } |
| 91 | |
| 92 | private static function completeLogin($success) { |
| 93 | if ($success === true) { |
| 94 | $_SESSION["id"] = $_SESSION["firstfactorid"]; |
| 95 | unset($_SESSION["firstfactorid"]); |
| 96 | return true; |
| 97 | } |
| 98 | |
| 99 | if ($success === false) { |
| 100 | unset($_SESSION["firstfactorid"]); |
| 101 | return true; |
| 102 | } |
| 103 | |
| 104 | return false; |
| 105 | } |
| 106 | |
| 107 | public static function completeCodeChallenge($code) { |
| 108 | global $_SESSION; |
| 109 | |
| 110 | $success = self::checkPersonCode($_SESSION["firstfactorid"], $code); |
| 111 | self::completeLogin($success); |
| 112 | return $success; |
| 113 | } |
| 114 | |
| 115 | private static function newWebAuthn() { |
| 116 | global $conf; |
| 117 | |
| 118 | if (!isset($conf["secondFactor"]) || !isset($conf["secondFactor"]["origin"])) { |
| 119 | throw new Exception('secondFactor is not enabled (or the origin is not set) in config.php.'); |
| 120 | } |
| 121 | |
| 122 | return new \lbuchs\WebAuthn\WebAuthn($conf["appName"], $conf["secondFactor"]["origin"], ["none"]); |
| 123 | } |
| 124 | |
| 125 | public static function createRegistrationChallenge() { |
| 126 | global $_SESSION; |
| 127 | |
| 128 | $WebAuthn = self::newWebAuthn(); |
| 129 | |
| 130 | $credentialIds = self::getCredentialIds(); |
| 131 | $createArgs = $WebAuthn->getCreateArgs(people::userData("id"), people::userData("username"), people::userData("name"), 20, false, false, ($credentialIds === false ? [] : $credentialIds)); |
| 132 | $_SESSION['webauthnchallenge'] = $WebAuthn->getChallenge(); |
| 133 | |
| 134 | return $createArgs; |
| 135 | } |
| 136 | |
| 137 | public static function addSecurityKeyToDB($credentialId, $credentialPublicKey, $name) { |
| 138 | global $con; |
| 139 | |
| 140 | $person = people::userData("id"); |
| 141 | if ($person === false) return false; |
| 142 | $sperson = (int)$person; |
| 143 | |
| 144 | $sname = db::sanitize($name); |
| 145 | $scredentialId = db::sanitize($credentialId); |
| 146 | $scredentialPublicKey = db::sanitize($credentialPublicKey); |
| 147 | $stime = (int)time(); |
| 148 | |
| 149 | return mysqli_query($con, "INSERT INTO securitykeys (person, name, credentialid, credentialpublickey, added) VALUES ($sperson, '$sname', '$scredentialId', '$scredentialPublicKey', $stime)"); |
| 150 | } |
| 151 | |
| 152 | public static function completeRegistrationChallenge($clientDataJSON, $attestationObject, $name) { |
| 153 | global $_SESSION; |
| 154 | |
| 155 | $clientDataJSON = base64_decode($clientDataJSON); |
| 156 | $attestationObject = base64_decode($attestationObject); |
| 157 | |
| 158 | if (!isset($_SESSION["webauthnchallenge"])) { |
| 159 | throw new Exception('The user didn\'t start the webauthn challenge.'); |
| 160 | } |
| 161 | $challenge = $_SESSION["webauthnchallenge"]; |
| 162 | unset($_SESSION["webauthnchallenge"]); |
| 163 | |
| 164 | $WebAuthn = self::newWebAuthn(); |
| 165 | $data = $WebAuthn->processCreate($clientDataJSON, $attestationObject, $challenge); |
| 166 | |
| 167 | if (!self::addSecurityKeyToDB($data->credentialId, $data->credentialPublicKey, $name)) { |
| 168 | throw new Exception('Failed adding security key to DB.'); |
| 169 | } |
| 170 | |
| 171 | return ["status" => "ok"]; |
| 172 | } |
| 173 | |
| 174 | public static function getSecurityKeys($person = "ME") { |
| 175 | global $con; |
| 176 | |
| 177 | if ($person == "ME") $person = people::userData("id"); |
| 178 | if ($person === false) return false; |
| 179 | $sperson = (int)$person; |
| 180 | |
| 181 | $query = mysqli_query($con, "SELECT * FROM securitykeys WHERE person = $sperson"); |
| 182 | if ($query === false) return false; |
| 183 | |
| 184 | $securityKeys = []; |
| 185 | while ($row = mysqli_fetch_assoc($query)) { |
| 186 | $securityKeys[] = $row; |
| 187 | } |
| 188 | |
| 189 | return $securityKeys; |
| 190 | } |
| 191 | |
| 192 | public static function getCredentialIds($person = "ME") { |
| 193 | $securityKeys = self::getSecurityKeys($person); |
| 194 | if ($securityKeys === false) return false; |
| 195 | |
| 196 | $credentials = []; |
| 197 | foreach ($securityKeys as $s) $credentials[] = $s["credentialid"]; |
| 198 | |
| 199 | return $credentials; |
| 200 | } |
| 201 | |
| 202 | public static function hasSecurityKeys($person) { |
| 203 | global $con; |
| 204 | |
| 205 | $sperson = (int)$person; |
| 206 | |
| 207 | $query = mysqli_query($con, "SELECT 1 FROM securitykeys WHERE person = $sperson LIMIT 1"); |
| 208 | if ($query === false) return false; |
| 209 | |
| 210 | return (mysqli_num_rows($query) > 0); |
| 211 | } |
| 212 | |
| 213 | public static function createValidationChallenge() { |
| 214 | global $_SESSION; |
| 215 | |
| 216 | $WebAuthn = self::newWebAuthn(); |
| 217 | |
| 218 | if (!isset($_SESSION["firstfactorid"])) { |
| 219 | throw new Exception('User didn\'t log in with the first factor.'); |
| 220 | } |
| 221 | $credentialIds = self::getCredentialIds($_SESSION["firstfactorid"]); |
| 222 | if ($credentialIds === false || empty($credentialIds)) { |
| 223 | throw new Exception('The user credentials could not be obtained.'); |
| 224 | } |
| 225 | |
| 226 | $getArgs = $WebAuthn->getGetArgs($credentialIds); |
| 227 | $_SESSION['webauthnvalidationchallenge'] = $WebAuthn->getChallenge(); |
| 228 | |
| 229 | return $getArgs; |
| 230 | } |
| 231 | |
| 232 | public static function getSecurityKey($credentialId, $person) { |
| 233 | $securityKeys = self::getSecurityKeys($person); |
| 234 | |
| 235 | foreach ($securityKeys as $s) { |
| 236 | if ($s["credentialid"] == $credentialId) { |
| 237 | return $s; |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | return null; |
| 242 | } |
| 243 | |
| 244 | public static function getSecurityKeyById($id) { |
| 245 | global $con; |
| 246 | |
| 247 | $query = mysqli_query($con, "SELECT * FROM securitykeys WHERE id = $id"); |
| 248 | if ($query === false || !mysqli_num_rows($query)) return false; |
| 249 | |
| 250 | return mysqli_fetch_assoc($query); |
| 251 | } |
| 252 | |
| 253 | public static function removeSecurityKey($id) { |
| 254 | global $con; |
| 255 | |
| 256 | $sid = (int)$id; |
| 257 | $sperson = (int)people::userData("id"); |
| 258 | if ($sperson === false) return false; |
| 259 | |
| 260 | return mysqli_query($con, "DELETE FROM securitykeys WHERE id = $sid and PERSON = $sperson LIMIT 1"); |
| 261 | } |
| 262 | |
| 263 | private static function recordSecurityKeyUsageToDB($id) { |
| 264 | global $con; |
| 265 | |
| 266 | $sid = (int)$id; |
| 267 | $stime = (int)time(); |
| 268 | |
| 269 | return mysqli_query($con, "UPDATE securitykeys SET lastused = $stime WHERE id = $sid LIMIT 1"); |
| 270 | } |
| 271 | |
| 272 | public static function completeValidationChallenge($id, $clientDataJSON, $authenticatorData, $signature) { |
| 273 | global $_SESSION; |
| 274 | |
| 275 | $id = base64_decode($id); |
| 276 | $clientDataJSON = base64_decode($clientDataJSON); |
| 277 | $authenticatorData = base64_decode($authenticatorData); |
| 278 | $signature = base64_decode($signature); |
| 279 | |
| 280 | if (!isset($_SESSION["webauthnvalidationchallenge"])) { |
| 281 | throw new Exception('The user didn\'t start the webauthn challenge.'); |
| 282 | } |
| 283 | $challenge = $_SESSION["webauthnvalidationchallenge"]; |
| 284 | unset($_SESSION["webauthnvalidationchallenge"]); |
| 285 | |
| 286 | $securityKey = self::getSecurityKey($id, $_SESSION["firstfactorid"]); |
| 287 | $credentialPublicKey = $securityKey["credentialpublickey"] ?? null; |
| 288 | if ($credentialPublicKey === null) { |
| 289 | self::completeLogin(false); |
| 290 | throw new Exception('The security key could not be found.'); |
| 291 | } |
| 292 | |
| 293 | try { |
| 294 | $WebAuthn = self::newWebAuthn(); |
| 295 | |
| 296 | $WebAuthn->processGet($clientDataJSON, $authenticatorData, $signature, $credentialPublicKey, $challenge); |
| 297 | } catch (Throwable $ex) { |
| 298 | self::completeLogin(false); |
| 299 | throw $ex; |
| 300 | } |
| 301 | |
| 302 | self::recordSecurityKeyUsageToDB($securityKey["id"]); |
| 303 | self::completeLogin(true); |
| 304 | |
| 305 | return ["status" => "ok"]; |
| 306 | } |
| 307 | } |