// Copyright 2022 The Gitea Authors. All rights reserved.// SPDX-License-Identifier: MIT package ssh import (	"fmt"	"net"	"os"	"path/filepath"	"strconv"	"strings" 	"forgejo.org/modules/log"	"forgejo.org/modules/setting") func Init() error {	if setting.SSH.Disabled {		builtinUnused()		return nil	} 	if setting.SSH.StartBuiltinServer {		Listen(setting.SSH.ListenHost, setting.SSH.ListenPort, setting.SSH.ServerCiphers, setting.SSH.ServerKeyExchanges, setting.SSH.ServerMACs)		log.Info("SSH server started on %s. Cipher list (%v), key exchange algorithms (%v), MACs (%v)",			net.JoinHostPort(setting.SSH.ListenHost, strconv.Itoa(setting.SSH.ListenPort)),			setting.SSH.ServerCiphers, setting.SSH.ServerKeyExchanges, setting.SSH.ServerMACs,		)		return nil	} 	builtinUnused() 	// FIXME: why 0o644 for a directory .....	if err := os.MkdirAll(setting.SSH.KeyTestPath, 0o644); err != nil {		return fmt.Errorf("failed to create directory %q for ssh key test: %w", setting.SSH.KeyTestPath, err)	} 	if len(setting.SSH.TrustedUserCAKeys) > 0 && setting.SSH.AuthorizedPrincipalsEnabled {		caKeysFileName := setting.SSH.TrustedUserCAKeysFile		caKeysFileDir := filepath.Dir(caKeysFileName) 		err := os.MkdirAll(caKeysFileDir, 0o700) // SSH.RootPath by default (That is `~/.ssh` in most cases)		if err != nil {			return fmt.Errorf("failed to create directory %q for ssh trusted ca keys: %w", caKeysFileDir, err)		} 		if err := os.WriteFile(caKeysFileName, []byte(strings.Join(setting.SSH.TrustedUserCAKeys, "\n")), 0o600); err != nil {			return fmt.Errorf("failed to write ssh trusted ca keys to %q: %w", caKeysFileName, err)		}	} 	return nil}