// Copyright 2015-2016 Luke Shumaker . // // This is free software; you can redistribute it and/or // modify it under the terms of the GNU General Public License as // published by the Free Software Foundation; either version 2 of // the License, or (at your option) any later version. // // This software is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public // License along with this manual; if not, see // . package nshd_files import ( "fmt" "io/ioutil" "os" "sort" "strings" "git.lukeshu.com/go/libgnulinux/crypt" "git.lukeshu.com/go/libsystemd/sd_daemon" ) /* Note that the password hash value should be one of: - no password set, allow login without password ! - used to prevent logins x - "valid" encrypted password that does not match any valid password often used to indicate that the password is defined elsewhere other - encrypted password, in crypt(3) format */ const shadow_file = "@shadow_file@" func LoadAllPasswords() (map[string]string, error) { file, err := os.Open(shadow_file) if err != nil { return nil, err } contents, err := ioutil.ReadAll(file) if err != nil { return nil, err } lines := strings.Split(string(contents), "\n") passwords := make(map[string]string, len(lines)) for i, line := range lines { if line == "" { continue } cols := strings.SplitN(line, ":", 2) if len(cols) != 2 { sd_daemon.Log.Err(fmt.Sprintf("hackers.git %s:%d: malformed line", shadow_file, i+1)) continue } username := cols[0] hash := cols[1] if hash != "!" && !crypt.SaltOk(hash) { hash = "!" sd_daemon.Log.Err(fmt.Sprintf("%s:%d: malformed hash for user: %s", shadow_file, i+1, username)) } passwords[username] = hash } return passwords, nil } func SaveAllPasswords(passwords map[string]string) error { usernames := make([]string, len(passwords)) i := 0 for username, _ := range passwords { usernames[i] = username i++ } sort.Strings(usernames) file, err := os.OpenFile(shadow_file+"-", os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0600) if err != nil { return err } for _, username := range usernames { fmt.Fprintf(file, "%s:%s\n", username, passwords[username]) } err = file.Sync() if err != nil { return err } err = file.Close() if err != nil { return err } return os.Rename(shadow_file+"-", shadow_file) }