andreandClaude Opus 4.8
e68d357177
Plain-PHP fleet platform with id.andmore.pt SSO. Wires shared/platform-tools as a submodule (platform_update, backups, git/migration tools) like the other platforms. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
55 lines
2.4 KiB
PHP
55 lines
2.4 KiB
PHP
<?php
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// ─── CSRF protection ─────────────────────────────────────────────────────────
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// One token per PHP session, embedded in every POST form. The token is also
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// usable in AJAX via the X-CSRF-Token header.
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//
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// Usage in a view: emit csrf_field() inside any <form method="POST">, e.g.
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// using a short echo tag right after the form opening. csrf_field() returns
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// the full hidden input markup.
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//
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// Usage in a POST handler (before any side-effects): call csrf_check(). On
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// failure it sends 403 and exits — never returns to the caller.
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//
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// SameSite=Lax already blocks the common "image-form" cross-site POST attack,
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// but does NOT protect against same-site XSS or an attacker that controls any
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// sibling subdomain under the .andmore.pt cookie scope. That's what this is
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// for.
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//
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// NOTE: do NOT include the literal short-echo close-tag inside comments in
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// this file. PHP closes the script block at the first such sequence even when
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// it appears inside a // comment, and any whitespace after it gets emitted as
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// HTML output — which then breaks header() with "headers already sent".
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function csrf_token(): string {
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if (empty($_SESSION['csrf_token']) || !is_string($_SESSION['csrf_token'])) {
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$_SESSION['csrf_token'] = bin2hex(random_bytes(32));
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}
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return $_SESSION['csrf_token'];
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}
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function csrf_field(): string {
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return '<input type="hidden" name="_csrf" value="' . htmlspecialchars(csrf_token(), ENT_QUOTES) . '">';
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}
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function csrf_check(): void {
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if (($_SERVER['REQUEST_METHOD'] ?? 'GET') !== 'POST') return;
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$supplied = $_POST['_csrf']
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?? $_SERVER['HTTP_X_CSRF_TOKEN']
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?? '';
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$expected = $_SESSION['csrf_token'] ?? '';
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if (!is_string($supplied) || $expected === '' || !hash_equals($expected, $supplied)) {
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http_response_code(403);
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header('Content-Type: text/html; charset=utf-8');
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echo '<!doctype html><meta charset="utf-8"><title>Sessão expirada</title>'
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. '<div style="font-family:sans-serif;max-width:520px;margin:80px auto;text-align:center;">'
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. '<h2>Sessão expirada</h2>'
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. '<p>Recarregue a página e tente novamente.</p>'
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. '<p><a href="javascript:history.back()">← Voltar</a></p>'
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. '</div>';
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exit;
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}
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}
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