mirror of
https://github.com/the-djmaze/snappymail.git
synced 2026-08-25 18:19:22 +03:00
695 lines
No EOL
27 KiB
PHP
695 lines
No EOL
27 KiB
PHP
<?php
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/**
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* SnappyMail login-o365 plugin
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* You need to register an app in Azure portal and add
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* a secret, redirect URIs and the following API permissions:
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* https://outlook.office.com/IMAP.AccessAsUser.All
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* https://outlook.office.com/SMTP.Send
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* openid offline_access email profile
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* https://learn.microsoft.com/en-us/entra/identity-platform/reply-url#query-parameter-support-in-redirect-uris
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* Query: redirect_uri=https://{DOMAIN}/?LoginO365
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* Path: redirect_uri=https://{DOMAIN}/LoginO365
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*
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* If running behind nginx reverse proxy you might
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* need to add the following to your nginx config:
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* location = /LoginO365 {
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* return 302 /?LoginO365&$args;
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* }
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*/
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use RainLoop\Model\MainAccount;
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use RainLoop\Providers\Storage\Enumerations\StorageType;
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class LoginO365Plugin extends \RainLoop\Plugins\AbstractPlugin
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{
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const
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NAME = 'Office365/Outlook OAuth2',
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VERSION = '0.4',
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RELEASE = '2025-12-22',
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REQUIRED = '2.36.1',
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CATEGORY = 'Login',
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DESCRIPTION = 'Office365/Outlook IMAP, Sieve & SMTP login using RFC 7628 OAuth2';
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// v2 endpoints
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const
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AUTH_URI = 'https://login.microsoftonline.com/{{tenant}}/oauth2/v2.0/authorize',
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TOKEN_URI = 'https://login.microsoftonline.com/{{tenant}}/oauth2/v2.0/token';
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/**
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* In-request cache of decrypted token bundles, keyed by lowercase email.
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* This avoids re-decrypting the same blob multiple times during a single request.
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*
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* Shape:
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* [
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* 'user@outlook.com' => ['access_token'=>..., 'refresh_token'=>..., 'expires'=>..., 'expires_in'=>...],
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* ...
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* ]
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*/
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private static array $auth = [];
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public function Init() : void
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{
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$this->UseLangs(true);
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$this->addJs('LoginOAuth2.js');
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$this->addHook('imap.before-login', 'clientLogin');
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$this->addHook('smtp.before-login', 'clientLogin');
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$this->addHook('sieve.before-login', 'clientLogin');
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$this->addPartHook('LoginO365', 'ServiceLoginO365');
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// Used by JS to obtain an auth URL with signed state (for both login + add-account flows).
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$this->addJsonHook('LoginO365AuthUrl', 'DoLoginO365AuthUrl');
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// Prevent Disallowed Sec-Fetch Dest: document Mode: navigate Site: cross-site User: true
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$this->addHook('filter.http-paths', 'httpPaths');
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// Cleanup: when an additional account is removed, also remove its encrypted refresh token bundle.
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$this->addHook('json.after-AccountDelete', 'afterAccountDelete');
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}
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public function httpPaths(array &$aPaths) : void
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{
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if (!empty($_SERVER['PATH_INFO']) && \str_ends_with($_SERVER['PATH_INFO'], 'LoginO365')) {
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$aPaths = ['LoginO365'];
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}
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if (!empty($aPaths[0]) && 'LoginO365' === $aPaths[0]) {
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$oConfig = \RainLoop\Api::Config();
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$oConfig->Set('security', 'secfetch_allow',
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\trim($oConfig->Get('security', 'secfetch_allow', '') . ';site=cross-site', ';')
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);
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}
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}
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public function ServiceLoginO365() : string
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{
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$oActions = \RainLoop\Api::Actions();
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$oHttp = $oActions->Http();
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$oHttp->ServerNoCache();
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try
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{
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if (isset($_GET['error'])) {
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$desc = $_GET['error_description'] ?? '';
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throw new \RuntimeException("{$_GET['error']}: {$desc}");
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}
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// Must have code + state
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if (!isset($_GET['code']) || empty($_GET['state'])) {
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$oActions->Location(\RainLoop\Utils::WebPath());
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exit;
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}
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$oO365 = $this->o365Connector();
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if (!$oO365) {
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$oActions->Location(\RainLoop\Utils::WebPath());
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exit;
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}
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$iNow = \time();
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$redirectUri = $this->redirectUri();
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$tenant = $this->Config()->Get('plugin', 'tenant', 'common');
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$state = (string) $_GET['state'];
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$statePayload = $this->verifyAndConsumeState($state);
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if (!$statePayload) {
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$oActions->Location(\RainLoop\Utils::WebPath());
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exit;
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}
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$aTokenWrap = $oO365->getAccessToken(
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\str_replace('{{tenant}}', $tenant, static::TOKEN_URI),
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'authorization_code',
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[
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'code' => $_GET['code'],
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'redirect_uri' => $redirectUri
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]
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);
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if (!\is_array($aTokenWrap) || !isset($aTokenWrap['code'])) {
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throw new \RuntimeException('Token request failed: ' . \json_encode($aTokenWrap));
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}
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if (200 !== (int)$aTokenWrap['code']) {
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$err = $aTokenWrap['result']['error'] ?? '';
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$desc = $aTokenWrap['result']['error_description'] ?? '';
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throw new \RuntimeException("Token HTTP {$aTokenWrap['code']}: {$err} / {$desc}");
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}
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$aToken = $aTokenWrap['result'] ?? [];
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$accessToken = $aToken['access_token'] ?? '';
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$refreshToken = $aToken['refresh_token'] ?? '';
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$expiresIn = (int)($aToken['expires_in'] ?? 0);
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$idToken = $aToken['id_token'] ?? '';
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if ($accessToken === '') {
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throw new \RuntimeException('access_token missing');
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}
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if ($refreshToken === '') {
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throw new \RuntimeException('refresh_token missing');
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}
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if ($idToken === '') {
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// We rely on id_token to get email/sub without Graph.
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throw new \RuntimeException('id_token missing (add openid email profile scopes)');
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}
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// Parse id_token (JWT) to get identity (sub + email)
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$claims = $this->decodeJwtPayload($idToken);
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if (!\is_array($claims)) {
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throw new \RuntimeException('Cannot decode id_token payload');
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}
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$email = $claims['email'] ?? ($claims['preferred_username'] ?? ($claims['upn'] ?? ''));
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$sub = $claims['sub'] ?? '';
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if ($sub === '') {
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throw new \RuntimeException('unknown id from id_token');
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}
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if ($email === '') {
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throw new \RuntimeException('unknown email address from id_token');
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}
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if (!$this->isSupportedEmail(\strtolower($email))) {
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throw new \RuntimeException('Unsupported email domain for this plugin');
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}
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$tokenBundle = [
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'access_token' => $accessToken,
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'refresh_token' => $refreshToken,
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'expires_in' => $expiresIn,
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'expires' => $iNow + $expiresIn
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];
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$op = $statePayload['op'] ?? 'login';
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if ('add' === $op) {
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$oMainAccount = $oActions->getMainAccountFromToken(false);
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if (!$oMainAccount) {
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throw new \RuntimeException('Add-account flow requires logged in main account');
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}
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if (!empty($statePayload['main']) && $statePayload['main'] !== $oMainAccount->Email()) {
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throw new \RuntimeException('Add-account state does not match current main account');
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}
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// Store token bundle encrypted with MAIN account crypt key (never store refresh_token unencrypted).
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// This is later used by imap/smtp/sieve.before-login for *additional* accounts.
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$this->storeAccountTokens($oMainAccount, $email, $tokenBundle);
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// Create/validate an AdditionalAccount entry exactly like SnappyMail expects in "additionalaccounts".
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// We set the "password" to the OAuth subject (sub) as an opaque secret; the plugin will inject XOAUTH2.
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$oPassword = new \SnappyMail\SensitiveString($sub);
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$oAdditional = $oActions->LoginProcess($email, $oPassword, false);
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if (!$oAdditional instanceof \RainLoop\Model\AdditionalAccount) {
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throw new \RuntimeException('Failed to create additional account');
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}
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$asciiEmail = \SnappyMail\IDN::emailToAscii($oAdditional->Email());
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if ($asciiEmail === $oMainAccount->Email()) {
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throw new \RuntimeException('Cannot add main account as additional');
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}
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$aAccounts = $oActions->GetAccounts($oMainAccount);
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$aEntry = $oAdditional->asTokenArray($oMainAccount);
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if (!empty($statePayload['name']) && \is_string($statePayload['name'])) {
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$aEntry['name'] = \trim($statePayload['name']);
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} else if (isset($aAccounts[$asciiEmail]['name'])) {
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// Preserve previous custom label if re-adding/updating.
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$aEntry['name'] = (string) $aAccounts[$asciiEmail]['name'];
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}
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$aAccounts[$asciiEmail] = $aEntry;
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$oActions->SetAccounts($oMainAccount, $aAccounts);
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// Cache for this request (used during LoginProcess() above and any subsequent logins).
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static::$auth[\strtolower($asciiEmail)] = $tokenBundle;
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$returnHash = '';
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if (!empty($statePayload['return']) && \is_string($statePayload['return']) && \str_starts_with($statePayload['return'], '#')) {
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$returnHash = $statePayload['return'];
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}
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$oActions->Location(\RainLoop\Utils::WebPath() . $returnHash);
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exit;
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}
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// Default: "login" flow (preserve existing behavior)
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static::$auth[\strtolower($email)] = $tokenBundle;
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// SnappyMail uses password as opaque string; plugin injects XOAUTH2 later.
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$oPassword = new \SnappyMail\SensitiveString($sub);
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$oAccount = $oActions->LoginProcess($email, $oPassword);
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if ($oAccount) {
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$oActions->StorageProvider()->Put(
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$oAccount,
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StorageType::SESSION,
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\RainLoop\Utils::GetSessionToken(),
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\SnappyMail\Crypt::EncryptToJSON($tokenBundle, $oAccount->CryptKey())
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);
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}
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}
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catch (\Throwable $e) {
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$oActions->Logger()->WriteException($e, \LOG_ERR);
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}
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$oActions->Location(\RainLoop\Utils::WebPath());
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exit;
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}
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public function configMapping() : array
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{
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return [
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\RainLoop\Plugins\Property::NewInstance('client_id')
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->SetLabel('Client ID')
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->SetType(\RainLoop\Enumerations\PluginPropertyType::STRING)
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->SetAllowedInJs(),
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\RainLoop\Plugins\Property::NewInstance('client_secret')
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->SetLabel('Client Secret')
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->SetType(\RainLoop\Enumerations\PluginPropertyType::STRING)
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->SetEncrypted(),
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\RainLoop\Plugins\Property::NewInstance('tenant')
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->SetLabel('Tenant')
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->SetType(\RainLoop\Enumerations\PluginPropertyType::SELECTION)
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->SetDefaultValue(['common','consumers','organizations'])
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->SetAllowedInJs(),
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\RainLoop\Plugins\Property::NewInstance('personal')
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// When true: redirect URI uses query parameter form "/?LoginO365" (Azure supports it).
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// When false: redirect URI uses path form "/LoginO365" (useful behind reverse proxies).
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->SetLabel('Use "/?LoginO365" redirect URI')
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->SetType(\RainLoop\Enumerations\PluginPropertyType::BOOL)
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->SetDefaultValue(false)
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->SetAllowedInJs(),
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\RainLoop\Plugins\Property::NewInstance('allow_any_domain')
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->SetLabel('Allow any domain (not only outlook.com/hotmail.com/live.com)')
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->SetType(\RainLoop\Enumerations\PluginPropertyType::BOOL)
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->SetDefaultValue(false)
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->SetAllowedInJs()
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];
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}
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public function clientLogin(\RainLoop\Model\Account $oAccount, \MailSo\Net\NetClient $oClient, \MailSo\Net\ConnectSettings $oSettings) : void
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{
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$email = \strtolower($oAccount->Email());
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if (!$this->isSupportedEmail($email)) {
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return;
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}
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$oActions = \RainLoop\Api::Actions();
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$aData = static::$auth[$email] ?? null;
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if (!$aData) {
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try {
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if ($oAccount instanceof MainAccount) {
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$blob = $oActions->StorageProvider()->Get(
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$oAccount,
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StorageType::SESSION,
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\RainLoop\Utils::GetSessionToken()
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);
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$aData = \SnappyMail\Crypt::DecryptFromJSON($blob, $oAccount->CryptKey());
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} else if ($oAccount instanceof \RainLoop\Model\AdditionalAccount) {
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$oMain = $oActions->getMainAccountFromToken(false);
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if (!$oMain) {
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return;
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}
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$blob = $oActions->StorageProvider()->Get(
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$oMain,
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StorageType::CONFIG,
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$this->tokenStorageKey($email)
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);
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$aData = \SnappyMail\Crypt::DecryptFromJSON($blob, $oMain->CryptKey());
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}
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} catch (\Throwable $e) {
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return;
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}
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}
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if (empty($aData['access_token']) || empty($aData['refresh_token']) || empty($aData['expires'])) {
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return;
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}
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// Refresh if expired (or close to expiry)
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if (\time() >= ((int)$aData['expires'] - 30)) {
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$oO365 = $this->o365Connector();
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if ($oO365) {
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$tenant = $this->Config()->Get('plugin', 'tenant', 'common');
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$aRefreshWrap = $oO365->getAccessToken(
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\str_replace('{{tenant}}', $tenant, static::TOKEN_URI),
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'refresh_token',
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['refresh_token' => $aData['refresh_token']]
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);
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if (\is_array($aRefreshWrap) && isset($aRefreshWrap['code']) && 200 === (int)$aRefreshWrap['code']) {
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$r = $aRefreshWrap['result'] ?? [];
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if (!empty($r['access_token'])) {
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$aData['access_token'] = $r['access_token'];
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}
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if (!empty($r['refresh_token'])) {
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$aData['refresh_token'] = $r['refresh_token'];
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}
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$expiresIn = (int)($r['expires_in'] ?? 0);
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if ($expiresIn > 0) {
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$aData['expires'] = \time() + $expiresIn;
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$aData['expires_in'] = $expiresIn;
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}
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// Persist updated bundle (encrypted).
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if ($oAccount instanceof MainAccount) {
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$oActions->StorageProvider()->Put(
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$oAccount,
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StorageType::SESSION,
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\RainLoop\Utils::GetSessionToken(),
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\SnappyMail\Crypt::EncryptToJSON($aData, $oAccount->CryptKey())
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);
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} else if ($oAccount instanceof \RainLoop\Model\AdditionalAccount) {
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$oMain = $oActions->getMainAccountFromToken(false);
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if ($oMain) {
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$oActions->StorageProvider()->Put(
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$oMain,
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StorageType::CONFIG,
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$this->tokenStorageKey($email),
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\SnappyMail\Crypt::EncryptToJSON($aData, $oMain->CryptKey())
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);
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}
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}
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}
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}
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}
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static::$auth[$email] = $aData;
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// Inject XOAUTH2/OAUTHBEARER
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$oSettings->passphrase = $aData['access_token'];
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\array_unshift($oSettings->SASLMechanisms, 'OAUTHBEARER', 'XOAUTH2');
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}
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/**
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* Server-side cleanup hook: after a successful AccountDelete, remove stored token bundle for that email.
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* This prevents leaving encrypted refresh tokens behind when an additional account is removed.
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*/
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public function afterAccountDelete(array &$aResponse) : void
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{
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if (empty($aResponse['Result'])) {
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return;
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}
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$oActions = \RainLoop\Api::Actions();
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$oMain = $oActions->getMainAccountFromToken(false);
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if (!$oMain) {
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return;
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}
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$email = \strtolower(\SnappyMail\IDN::emailToAscii(\trim((string) $oActions->GetActionParam('emailToDelete', ''))));
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if ($email && $this->isSupportedEmail($email)) {
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$oActions->StorageProvider()->Clear($oMain, StorageType::CONFIG, $this->tokenStorageKey($email));
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}
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}
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protected function o365Connector() : ?\OAuth2\Client
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{
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$client_id = \trim($this->Config()->Get('plugin', 'client_id', ''));
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$client_secret = \trim($this->Config()->getDecrypted('plugin', 'client_secret', ''));
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if ($client_id && $client_secret) {
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try {
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$oO365 = new \OAuth2\Client($client_id, $client_secret);
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$oActions = \RainLoop\Api::Actions();
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$sProxy = $oActions->Config()->Get('labs', 'curl_proxy', '');
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if (\strlen($sProxy)) {
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$oO365->setCurlOption(CURLOPT_PROXY, $sProxy);
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$sProxyAuth = $oActions->Config()->Get('labs', 'curl_proxy_auth', '');
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if (\strlen($sProxyAuth)) {
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$oO365->setCurlOption(CURLOPT_PROXYUSERPWD, $sProxyAuth);
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}
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}
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return $oO365;
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} catch (\Throwable $e) {
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\RainLoop\Api::Actions()->Logger()->WriteException($e, \LOG_ERR);
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}
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}
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return null;
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}
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private function decodeJwtPayload(string $jwt) : ?array
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{
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$parts = \explode('.', $jwt);
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if (\count($parts) < 2) {
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return null;
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}
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$payload = $parts[1];
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$payload .= \str_repeat('=', (4 - (\strlen($payload) % 4)) % 4);
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$json = \base64_decode(\strtr($payload, '-_', '+/'));
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if ($json === false) {
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return null;
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}
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$data = \json_decode($json, true);
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return \is_array($data) ? $data : null;
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}
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/**
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* JSON action called by JS to obtain an MS authorize URL with signed state.
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* This avoids exposing any signing secret to JS and keeps redirect_uri consistent with server logic.
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*/
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public function DoLoginO365AuthUrl() : array
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{
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$oActions = \RainLoop\Api::Actions();
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$op = (string) $this->jsonParam('op', 'login');
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if (!\in_array($op, ['login', 'add'], true)) {
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return $this->jsonResponse(__FUNCTION__, false);
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}
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$email = \strtolower(\trim((string) $this->jsonParam('email', '')));
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$name = \trim((string) $this->jsonParam('name', ''));
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$returnHash = (string) $this->jsonParam('return', '');
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if ($returnHash && !\str_starts_with($returnHash, '#')) {
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$returnHash = '';
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}
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// For add-account flow, require a logged-in main account (we must write to its additionalaccounts storage).
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$oMainAccount = null;
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if ('add' === $op) {
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$oMainAccount = $oActions->getMainAccountFromToken(false);
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if (!$oMainAccount) {
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return $this->jsonResponse(__FUNCTION__, false);
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}
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}
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|
|
// Optional server-side guard: only permit supported consumer domains unless configured otherwise.
|
|
if ($email && !$this->isSupportedEmail($email)) {
|
|
return $this->jsonResponse(__FUNCTION__, false);
|
|
}
|
|
|
|
$oConfig = $this->Config();
|
|
$client_id = \trim($oConfig->Get('plugin', 'client_id', ''));
|
|
if (!$client_id) {
|
|
return $this->jsonResponse(__FUNCTION__, false);
|
|
}
|
|
|
|
$nonce = $this->b64url(\random_bytes(16));
|
|
// Store nonce server-side to prevent replay; consumed on callback.
|
|
$oActions->StorageProvider()->Put(
|
|
null,
|
|
StorageType::NOBODY,
|
|
$this->stateNonceKey($nonce),
|
|
(string) \time()
|
|
);
|
|
|
|
$payload = [
|
|
'v' => 1,
|
|
'op' => $op,
|
|
'csrf' => \RainLoop\Utils::GetCsrfToken(),
|
|
'nonce' => $nonce,
|
|
'ts' => \time()
|
|
];
|
|
if ('add' === $op && $oMainAccount) {
|
|
$payload['main'] = $oMainAccount->Email();
|
|
if ($name) {
|
|
$payload['name'] = \substr($name, 0, 100);
|
|
}
|
|
if ($returnHash) {
|
|
$payload['return'] = \substr($returnHash, 0, 200);
|
|
}
|
|
}
|
|
|
|
$state = $this->signState($payload);
|
|
$tenant = $oConfig->Get('plugin', 'tenant', 'common');
|
|
$redirectUri = $this->redirectUri();
|
|
|
|
$params = [
|
|
'response_type' => 'code',
|
|
'client_id' => $client_id,
|
|
'redirect_uri' => $redirectUri,
|
|
'scope' => \implode(' ', [
|
|
'openid',
|
|
'offline_access',
|
|
'email',
|
|
'profile',
|
|
'https://outlook.office.com/IMAP.AccessAsUser.All',
|
|
'https://outlook.office.com/SMTP.Send',
|
|
]),
|
|
'state' => $state,
|
|
// Helps MS UI prefill, but does not change server-side validation.
|
|
];
|
|
if ($email) {
|
|
$params['login_hint'] = $email;
|
|
}
|
|
$authUrl = \str_replace('{{tenant}}', $tenant, static::AUTH_URI)
|
|
. '?'
|
|
. \http_build_query($params, '', '&', PHP_QUERY_RFC3986);
|
|
|
|
return $this->jsonResponse(__FUNCTION__, [
|
|
'authUrl' => $authUrl
|
|
]);
|
|
}
|
|
|
|
private function isSupportedEmail(string $email) : bool
|
|
{
|
|
if ((bool)$this->Config()->Get('plugin', 'allow_any_domain', false)) {
|
|
return \str_contains($email, '@');
|
|
}
|
|
return \str_ends_with($email, '@hotmail.com')
|
|
|| \str_ends_with($email, '@outlook.com')
|
|
|| \str_ends_with($email, '@live.com');
|
|
}
|
|
|
|
/**
|
|
* Build absolute base URL (works behind nginx reverse proxy).
|
|
*/
|
|
private function baseUrl() : string
|
|
{
|
|
$scheme = (!empty($_SERVER['HTTP_X_FORWARDED_PROTO']))
|
|
? $_SERVER['HTTP_X_FORWARDED_PROTO']
|
|
: ((!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off') ? 'https' : 'http');
|
|
|
|
$host = $_SERVER['HTTP_HOST'] ?? $_SERVER['SERVER_NAME'] ?? '';
|
|
if (!$host) {
|
|
throw new \RuntimeException('Cannot determine HTTP_HOST');
|
|
}
|
|
return $scheme . '://' . $host;
|
|
}
|
|
|
|
/**
|
|
* Redirect URI used for the Azure app registration.
|
|
* When plugin.personal=true -> "/?LoginO365"
|
|
* When plugin.personal=false -> "/LoginO365"
|
|
*/
|
|
private function redirectUri() : string
|
|
{
|
|
$base = \rtrim($this->baseUrl(), '/');
|
|
$useQuery = (bool)$this->Config()->Get('plugin', 'personal', false);
|
|
return $useQuery ? ($base . '/?LoginO365') : ($base . '/LoginO365');
|
|
}
|
|
|
|
private function tokenStorageKey(string $emailLower) : string
|
|
{
|
|
// Stored under MAIN account StorageType::CONFIG (encrypted with main CryptKey).
|
|
// Email is hashed to avoid path/encoding issues across storage backends.
|
|
return 'login-o365.tokens.' . \sha1($emailLower);
|
|
}
|
|
|
|
private function storeAccountTokens(MainAccount $oMainAccount, string $email, array $tokenBundle) : void
|
|
{
|
|
$emailLower = \strtolower(\SnappyMail\IDN::emailToAscii($email));
|
|
\RainLoop\Api::Actions()->StorageProvider()->Put(
|
|
$oMainAccount,
|
|
StorageType::CONFIG,
|
|
$this->tokenStorageKey($emailLower),
|
|
\SnappyMail\Crypt::EncryptToJSON($tokenBundle, $oMainAccount->CryptKey())
|
|
);
|
|
}
|
|
|
|
private function stateNonceKey(string $nonce) : string
|
|
{
|
|
return 'login-o365.state.' . $nonce;
|
|
}
|
|
|
|
private function b64url(string $bin) : string
|
|
{
|
|
return \rtrim(\strtr(\base64_encode($bin), '+/', '-_'), '=');
|
|
}
|
|
|
|
private function b64urlDecode(string $b64url) /*: string|false*/
|
|
{
|
|
$pad = (4 - (\strlen($b64url) % 4)) % 4;
|
|
return \base64_decode(\strtr($b64url . \str_repeat('=', $pad), '-_', '+/'), true);
|
|
}
|
|
|
|
private function stateHmacKey() : string
|
|
{
|
|
// Uses the plugin client_secret (server-side only) as HMAC key.
|
|
// This prevents any user-controlled tampering of the state payload.
|
|
$key = \trim($this->Config()->getDecrypted('plugin', 'client_secret', ''));
|
|
if (!$key) {
|
|
// Fallback for misconfiguration; keeps behavior deterministic.
|
|
$key = 'login-o365';
|
|
}
|
|
return $key;
|
|
}
|
|
|
|
private function signState(array $payload) : string
|
|
{
|
|
$json = \json_encode($payload);
|
|
if (!$json) {
|
|
$json = '{}';
|
|
}
|
|
$payloadB64 = $this->b64url($json);
|
|
$sig = \hash_hmac('sha256', $payloadB64, $this->stateHmacKey(), true);
|
|
return $payloadB64 . '.' . $this->b64url($sig);
|
|
}
|
|
|
|
/**
|
|
* Verify signature + CSRF + nonce, then consumes nonce to prevent replay.
|
|
* Returns decoded payload on success, null on failure.
|
|
*/
|
|
private function verifyAndConsumeState(string $state) : ?array
|
|
{
|
|
$parts = \explode('.', $state, 2);
|
|
if (2 !== \count($parts)) {
|
|
return null;
|
|
}
|
|
[$payloadB64, $sigB64] = $parts;
|
|
$sig = $this->b64urlDecode($sigB64);
|
|
if ($sig === false) {
|
|
return null;
|
|
}
|
|
|
|
$expected = \hash_hmac('sha256', $payloadB64, $this->stateHmacKey(), true);
|
|
if (!\hash_equals($expected, $sig)) {
|
|
return null;
|
|
}
|
|
|
|
$payloadJson = $this->b64urlDecode($payloadB64);
|
|
if ($payloadJson === false) {
|
|
return null;
|
|
}
|
|
$payload = \json_decode($payloadJson, true);
|
|
if (!\is_array($payload) || empty($payload['csrf']) || empty($payload['nonce']) || empty($payload['op'])) {
|
|
return null;
|
|
}
|
|
|
|
// Must match the current browser session.
|
|
if ($payload['csrf'] !== \RainLoop\Utils::GetCsrfToken()) {
|
|
return null;
|
|
}
|
|
|
|
// Replay protection: nonce must exist server-side and is consumed once.
|
|
$oActions = \RainLoop\Api::Actions();
|
|
$key = $this->stateNonceKey((string) $payload['nonce']);
|
|
$seen = $oActions->StorageProvider()->Get(null, StorageType::NOBODY, $key);
|
|
if (!$seen) {
|
|
return null;
|
|
}
|
|
|
|
$ts = (int) ($payload['ts'] ?? 0);
|
|
if ($ts && \abs(\time() - $ts) > 900) { // 15 minutes
|
|
// Expired: clear nonce to avoid accumulating stale entries.
|
|
$oActions->StorageProvider()->Clear(null, StorageType::NOBODY, $key);
|
|
return null;
|
|
}
|
|
|
|
$oActions->StorageProvider()->Clear(null, StorageType::NOBODY, $key);
|
|
|
|
return $payload;
|
|
}
|
|
} |