269 lines
13 KiB
PHP
269 lines
13 KiB
PHP
<?php
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namespace App\Services;
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use App\Models\Server;
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use App\Support\Os\FirewallTool;
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use App\Support\Os\OsDetector;
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use App\Support\Os\OsProfile;
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use App\Support\Os\PackageManager;
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use InvalidArgumentException;
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use RuntimeException;
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use Throwable;
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/**
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* Applies the dashboard server-hardening toggles over SSH (as root), OS-aware
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* across apt/dnf/zypper + ufw/firewalld (resolved per host via OsDetector). Every
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* item is BIDIRECTIONAL — apply($server, $action, $enable) toggles the underlying
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* feature; package items (fail2ban, auto-updates, firewall) install on demand.
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*
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* apply() runs the exact command built by commandFor() (the single source of truth);
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* title()/description() supply the German confirm-modal copy for each direction.
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* Each state() row carries `supported`/`reason`, so a feature unavailable on the
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* host's OS degrades with a German explanation instead of failing opaquely.
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* Disabling SSH password auth is GUARDED so the operator can never lock themselves out.
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*/
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class HardeningService
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{
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// 00- so it sorts + wins before distro drop-ins like 50-cloud-init.conf (sshd uses the first value).
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private const SSHD_DROPIN = '/etc/ssh/sshd_config.d/00-clusev.conf';
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// 99zz- so Clusev's apt periodic setting wins (apt uses the LAST value across apt.conf.d/*).
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private const APT_DROPIN = '/etc/apt/apt.conf.d/99zz-clusev';
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public function __construct(
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private FleetService $fleet,
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private FirewallService $firewall,
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private OsDetector $detector,
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) {}
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/**
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* Live state of every hardening item, read PRIVILEGED in one shot. SSH uses
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* `sshd -T` (the EFFECTIVE config — honours Include order + Match blocks); the
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* package/firewall/auto-update probes are built per-OS (dpkg vs rpm, ufw vs
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* firewalld, apt periodic vs dnf-automatic).
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*
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* @return array<int, array{key:string, label:string, detail:string, featureOn:bool, secure:bool, supported:bool, reason:?string}>
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*/
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public function state(Server $server): array
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{
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$os = $this->detector->detect($server);
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$pm = $os->managesPackages() ? PackageManager::for($os) : null;
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$fw = FirewallTool::for($os);
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// Shell CONDITIONS (exit 0 = true); `false` where the host lacks the tool.
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$f2bInst = $pm ? $pm->isInstalledTest('fail2ban') : 'false';
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$auInst = $pm ? $pm->isInstalledTest($os->packageManager === 'dnf' ? 'dnf-automatic' : 'unattended-upgrades') : 'false';
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$auActive = match ($os->packageManager) {
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'apt' => 'apt-config dump APT::Periodic::Unattended-Upgrade 2>/dev/null | grep -q \'"1"\'',
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'dnf' => 'systemctl is-enabled --quiet dnf-automatic.timer',
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default => 'false',
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};
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$cmd = 'sshd -T 2>/dev/null | grep -iE "^(permitrootlogin|passwordauthentication) "; '
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.'echo "fail2ban $('.$f2bInst.' && echo 1 || echo 0) $(systemctl is-active --quiet fail2ban && echo active || echo inactive)"; '
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.'echo "firewall $('.$fw->installedTest().' && echo 1 || echo 0) $('.$fw->activeTest().' && echo active || echo inactive)"; '
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.'echo "autoupdate $('.$auInst.' && echo 1 || echo 0) $('.$auActive.' && echo active || echo inactive)"';
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$res = $this->fleet->runPrivileged($server, $cmd);
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if (! $res['ok']) {
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throw new RuntimeException(__('backend.hardening_status_read_failed'));
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}
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return $this->parseState($res['output'], $os);
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}
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/** @return array<int, array{key:string, label:string, detail:string, featureOn:bool, secure:bool, supported:bool, reason:?string}> */
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private function parseState(string $out, OsProfile $os): array
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{
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$root = 'default';
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$pwauth = 'default';
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$pkg = [];
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foreach (preg_split('/\R/', $out) ?: [] as $line) {
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$line = trim($line);
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if (preg_match('/^permitrootlogin\s+(\S+)/i', $line, $m)) {
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$root = strtolower($m[1]);
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} elseif (preg_match('/^passwordauthentication\s+(\S+)/i', $line, $m)) {
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$pwauth = strtolower($m[1]);
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} else {
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$p = preg_split('/\s+/', $line);
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if (count($p) === 3 && in_array($p[0], ['fail2ban', 'firewall', 'autoupdate'], true)) {
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$pkg[$p[0]] = ['installed' => $p[1] === '1', 'active' => $p[2] === 'active'];
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}
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}
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}
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$f2b = $pkg['fail2ban'] ?? ['installed' => false, 'active' => false];
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$fw = $pkg['firewall'] ?? ['installed' => false, 'active' => false];
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$upg = $pkg['autoupdate'] ?? ['installed' => false, 'active' => false];
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$detail = fn (string $name, array $st): string => $name.' · '
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.(! $st['installed'] ? __('backend.item_not_installed') : ($st['active'] ? __('common.active') : __('common.inactive')));
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// A package feature is only effectively ON when installed AND active —
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// stale config (e.g. apt periodic = 1 after removal) must not read as secure.
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$on = fn (array $st): bool => $st['installed'] && $st['active'];
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$row = fn (string $key, string $label, string $detail, bool $featureOn, bool $secure, ?string $reason): array => [
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'key' => $key, 'label' => $label, 'detail' => $detail,
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'featureOn' => $featureOn, 'secure' => $secure,
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'supported' => $reason === null, 'reason' => $reason,
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];
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$fwName = $os->firewallTool === 'firewalld' ? 'firewalld' : 'ufw';
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$auName = $os->packageManager === 'dnf' ? 'dnf-automatic' : 'unattended-upgrades';
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// `featureOn` drives the button (Aktivieren/Deaktivieren); `secure` drives the OK/Offen pill.
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return [
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$row('ssh_root', __('backend.label_ssh_root'), 'PermitRootLogin '.$root, $root !== 'no', $root === 'no', $os->supports('ssh')),
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$row('ssh_password', __('backend.label_ssh_password'), 'PasswordAuthentication '.$pwauth, $pwauth !== 'no', $pwauth === 'no', $os->supports('ssh')),
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$row('fail2ban', 'fail2ban', $detail('fail2ban.service', $f2b), $on($f2b), $on($f2b), $os->supports('fail2ban')),
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$row('firewall', $os->firewallLabel(), $detail($fwName, $fw), $on($fw), $on($fw), $os->supports('firewall')),
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$row('unattended', __('backend.label_auto_updates'), $detail($auName, $upg), $on($upg), $on($upg), $os->supports('auto_updates')),
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];
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}
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/** Modal title, reflecting the toggle direction. */
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public function title(string $action, bool $enable): string
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{
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return match ($action) {
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'ssh_root' => $enable ? __('backend.title_ssh_root_enable') : __('backend.title_ssh_root_disable'),
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'ssh_password' => $enable ? __('backend.title_ssh_password_enable') : __('backend.title_ssh_password_disable'),
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'fail2ban' => $enable ? __('backend.title_fail2ban_enable') : __('backend.title_fail2ban_disable'),
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'firewall' => $enable ? __('backend.title_firewall_enable') : __('backend.title_firewall_disable'),
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'unattended' => $enable ? __('backend.title_unattended_enable') : __('backend.title_unattended_disable'),
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default => throw new InvalidArgumentException(__('backend.unknown_hardening', ['action' => $action])),
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};
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}
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public function description(string $action, bool $enable): string
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{
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return match ($action) {
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'ssh_root' => $enable
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? __('backend.desc_ssh_root_enable')
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: __('backend.desc_ssh_root_disable'),
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'ssh_password' => $enable
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? __('backend.desc_ssh_password_enable')
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: __('backend.desc_ssh_password_disable'),
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'fail2ban' => $enable
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? __('backend.desc_fail2ban_enable')
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: __('backend.desc_fail2ban_disable'),
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'firewall' => $enable
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? __('backend.desc_firewall_enable')
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: __('backend.desc_firewall_disable'),
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'unattended' => $enable
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? __('backend.desc_unattended_enable')
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: __('backend.desc_unattended_disable'),
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default => throw new InvalidArgumentException(__('backend.unknown_hardening', ['action' => $action])),
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};
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}
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/** @return array{ok: bool, output: string} */
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public function apply(Server $server, string $action, bool $enable): array
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{
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$os = $this->detector->detect($server);
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// Gracefully refuse a feature the host's OS does not support.
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$feature = match ($action) {
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'ssh_root', 'ssh_password' => 'ssh',
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'fail2ban' => 'fail2ban',
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'firewall' => 'firewall',
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'unattended' => 'auto_updates',
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default => throw new InvalidArgumentException(__('backend.unknown_hardening', ['action' => $action])),
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};
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if ($reason = $os->supports($feature)) {
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return ['ok' => false, 'output' => $reason];
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}
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if ($action === 'firewall') {
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$res = $enable ? $this->firewall->enable($server) : $this->firewall->disable($server);
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return ['ok' => $res['ok'], 'output' => $res['output']];
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}
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// Lock-out guard: never disable password auth without a usable key path.
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if ($action === 'ssh_password' && ! $enable) {
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if ($server->credential?->auth_type === 'password') {
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return ['ok' => false, 'output' => __('backend.ssh_password_self_lockout')];
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}
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if (! $this->hasAuthorizedKey($server)) {
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return ['ok' => false, 'output' => __('backend.ssh_password_no_key')];
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}
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}
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// package operations need a long timeout; the 12s default would abort the install.
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$timeout = $enable && in_array($action, ['fail2ban', 'unattended'], true) ? 600 : 60;
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$res = $this->fleet->runPrivileged($server, $this->commandFor($os, $action, $enable), $timeout);
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return ['ok' => $res['ok'], 'output' => $res['output']];
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}
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/** Single source of truth for the shell command of a (non-firewall) toggle. */
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private function commandFor(OsProfile $os, string $action, bool $enable): string
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{
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$pm = PackageManager::for($os);
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return match ($action) {
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'ssh_root' => $this->sshDropInScript('PermitRootLogin '.($enable ? 'yes' : 'no')),
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'ssh_password' => $this->sshDropInScript('PasswordAuthentication '.($enable ? 'yes' : 'no')),
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'fail2ban' => $enable
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? $pm->ensureInstalledScript('fail2ban').' && systemctl enable --now fail2ban'
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: 'systemctl disable --now fail2ban',
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'unattended' => $this->autoUpdateScript($os, $pm, $enable),
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default => throw new InvalidArgumentException(__('backend.unknown_hardening', ['action' => $action])),
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};
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}
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/** Auto-update mechanism per family: apt periodic + timers, or dnf-automatic.timer. */
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private function autoUpdateScript(OsProfile $os, PackageManager $pm, bool $enable): string
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{
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if ($os->packageManager === 'dnf') {
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return $enable
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? $pm->ensureInstalledScript('dnf-automatic')
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.' && sed -i \'s/^apply_updates.*/apply_updates = yes/\' /etc/dnf/automatic.conf'
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.' && systemctl enable --now dnf-automatic.timer'
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: 'systemctl disable --now dnf-automatic.timer';
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}
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// apt (default): the periodic drop-in + service/timers.
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return $enable
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? $pm->ensureInstalledScript('unattended-upgrades')
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.' && printf \'%s\n%s\n\' \'APT::Periodic::Update-Package-Lists "1";\' \'APT::Periodic::Unattended-Upgrade "1";\' > '.self::APT_DROPIN
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.' && systemctl enable --now unattended-upgrades apt-daily-upgrade.timer apt-daily.timer'
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: 'printf \'%s\n%s\n\' \'APT::Periodic::Update-Package-Lists "0";\' \'APT::Periodic::Unattended-Upgrade "0";\' > '.self::APT_DROPIN
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.' && (systemctl disable --now unattended-upgrades 2>/dev/null || true)';
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}
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/** True if the SSH user has at least one authorized key. */
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private function hasAuthorizedKey(Server $server): bool
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{
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try {
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if (count($this->fleet->sshKeys($server)) > 0) {
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return true;
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}
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} catch (Throwable) {
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// fall through to the raw check
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}
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$res = $this->fleet->runPlain($server, 'grep -cE "^(ssh-|ecdsa-|sk-)" ~/.ssh/authorized_keys 2>/dev/null || echo 0');
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return $res['ok'] && (int) trim($res['output']) > 0;
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}
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/**
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* Install one sshd directive into the Clusev drop-in (replacing any prior value
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* of the same key), then reload whichever ssh unit exists.
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*/
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private function sshDropInScript(string $directive): string
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{
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$key = strtok($directive, ' ');
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return 'mkdir -p /etc/ssh/sshd_config.d'
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.' && touch '.self::SSHD_DROPIN
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.' && grep -viE "^[[:space:]]*'.$key.'[[:space:]]" '.self::SSHD_DROPIN.' > '.self::SSHD_DROPIN.'.tmp 2>/dev/null; '
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.'mv '.self::SSHD_DROPIN.'.tmp '.self::SSHD_DROPIN.' 2>/dev/null; '
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.'echo "'.$directive.'" >> '.self::SSHD_DROPIN
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.' && (systemctl reload ssh || systemctl reload sshd)';
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}
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}
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