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// Copyright 2015-2016 Luke Shumaker <lukeshu@sbcglobal.net>.
//
// 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
// <http://www.gnu.org/licenses/>.
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:
<empty> - 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)
}
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