Add CLI commands for 2FA

The following commands are added:
- `icingacli twofactor list` lists all users that have 2FA enabled.
- `icingacli twofactor disable [<user>]` disables 2FA for a user.

application/clicommands/TwofactorCommand.php

@@ -0,0 +1,116 @@
+<?php
+
+namespace Icinga\Clicommands;
+
+use DateTime;
+use Icinga\Cli\Command;
+use Icinga\Common\Database;
+use ipl\Sql\Delete;
+use ipl\Sql\Select;
+use Throwable;
+
+class TwofactorCommand extends Command
+{
+    use Database;
+
+    /**
+     * List all users that have 2FA enabled
+     *
+     * This command lists all users that have 2FA enabled and when they enabled it.
+     *
+     * USAGE
+     *
+     * icingacli twofactor list
+     */
+    public function listAction(): void
+    {
+        $rows = $this->getDb()->select(
+            (new Select())
+                ->from('icingaweb_2fa')
+                ->columns(['username', 'ctime'])
+        )->fetchAll();
+
+        if (empty($rows)) {
+            echo "Currently there are no users that have 2FA enabled.\n";
+
+            return;
+        }
+
+        printf("%-20s %-20s\n", 'USER', 'ENABLED 2FA');
+
+        foreach ($rows as $row) {
+            printf(
+                "%-20s %-20s\n",
+                $row->username,
+                DateTime::createFromFormat('U.u', $row->ctime / 1000)->format('Y-m-d H:i:s')
+            );
+        }
+
+        echo "\n";
+    }
+
+    /**
+     * Disable 2FA for a specific user
+     *
+     * This command disables 2FA for a specific user. It asks for confirmation before deleting the secret. The deletion
+     * cannot be undone.
+     *
+     * USAGE
+     *
+     * icingacli twofactor disable [<user>]
+     *
+     * OPTIONS
+     *
+     * --force  Disable 2FA for user without confirmation
+     */
+    public function disableAction(): void
+    {
+        $user = $this->params->shift();
+
+        if (! $user) {
+            fwrite(STDERR, "User must be provided!\n");
+            $this->showUsage('disable');
+
+            exit(1);
+        }
+
+        if (! $this->params->shift('force')) {
+            $input = readline(sprintf(
+                "Are you sure you want to disable 2FA for user '%s'? This cannot be undone! [y/N] ",
+                $user
+            ));
+
+            if (! $input || ! in_array(strtolower(trim($input)), ['y', 'yes'])) {
+                echo "No changes made.\n";
+
+                return;
+            }
+        }
+
+        try {
+            $delete = $this->getDb()->prepexec(
+                (new Delete())
+                    ->from('icingaweb_2fa')
+                    ->where(['LOWER(username) = ?' => strtolower($user)])
+            );
+        } catch (Throwable $e) {
+            fprintf(
+                STDERR,
+                "%s: Failed to disable 2FA for '%s': %s\n",
+                $this->screen->colorize('ERROR', 'red'),
+                $user,
+                $e->getMessage()
+            );
+
+            exit(1);
+        }
+
+        if ($delete->rowCount() < 1) {
+            printf("The user '%s' doesn't have 2FA enabled.\n", $user);
+
+            return;
+        }
+
+        printf("Successfully disabled 2FA for user '%s'.\n", $user);
+    }
+}