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// Copyright 2014 The Gogs Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package models
import (
"bufio"
"errors"
"fmt"
"io"
"os"
"os/exec"
"path"
"path/filepath"
"strings"
"sync"
"time"
"github.com/Unknwon/com"
)
var (
sshOpLocker = sync.Mutex{}
//publicKeyRootPath string
sshPath string
appPath string
// "### autogenerated by gitgos, DO NOT EDIT\n"
tmplPublicKey = "command=\"%s serv key-%d\",no-port-forwarding," +
"no-X11-forwarding,no-agent-forwarding,no-pty %s\n"
)
func exePath() (string, error) {
file, err := exec.LookPath(os.Args[0])
if err != nil {
return "", err
}
return filepath.Abs(file)
}
func homeDir() string {
home, err := com.HomeDir()
if err != nil {
return "/"
}
return home
}
func init() {
var err error
appPath, err = exePath()
if err != nil {
println(err.Error())
os.Exit(2)
}
sshPath = filepath.Join(homeDir(), ".ssh")
}
type PublicKey struct {
Id int64
OwnerId int64 `xorm:"index"`
Name string `xorm:"unique not null"`
Fingerprint string
Content string `xorm:"text not null"`
Created time.Time `xorm:"created"`
Updated time.Time `xorm:"updated"`
}
var (
ErrKeyAlreadyExist = errors.New("Public key already exist")
)
func GenAuthorizedKey(keyId int64, key string) string {
return fmt.Sprintf(tmplPublicKey, appPath, keyId, key)
}
func AddPublicKey(key *PublicKey) (err error) {
// Check if public key name has been used.
has, err := orm.Get(key)
if err != nil {
return err
} else if has {
return ErrKeyAlreadyExist
}
// Calculate fingerprint.
tmpPath := filepath.Join(os.TempDir(), fmt.Sprintf("%d", time.Now().Nanosecond()),
"id_rsa.pub")
os.MkdirAll(path.Dir(tmpPath), os.ModePerm)
f, err := os.Create(tmpPath)
if err != nil {
return
}
if _, err = f.WriteString(key.Content); err != nil {
return err
}
f.Close()
stdout, _, err := com.ExecCmd("ssh-keygen", "-l", "-f", tmpPath)
if err != nil {
return err
} else if len(stdout) < 2 {
return errors.New("Not enough output for calculating fingerprint")
}
key.Fingerprint = strings.Split(stdout, " ")[1]
// Save SSH key.
if _, err = orm.Insert(key); err != nil {
return err
}
if err = SaveAuthorizedKeyFile(key); err != nil {
if _, err2 := orm.Delete(key); err2 != nil {
return err2
}
return err
}
return nil
}
// DeletePublicKey deletes SSH key information both in database and authorized_keys file.
func DeletePublicKey(key *PublicKey) (err error) {
has, err := orm.Id(key.Id).Get(key)
if err != nil {
return err
} else if !has {
return errors.New("Public key does not exist")
}
if _, err = orm.Delete(key); err != nil {
return err
}
sshOpLocker.Lock()
defer sshOpLocker.Unlock()
p := filepath.Join(sshPath, "authorized_keys")
tmpP := filepath.Join(sshPath, "authorized_keys.tmp")
fr, err := os.Open(p)
if err != nil {
return err
}
defer fr.Close()
fw, err := os.Create(tmpP)
if err != nil {
return err
}
defer fw.Close()
buf := bufio.NewReader(fr)
for {
line, errRead := buf.ReadString('\n')
line = strings.TrimSpace(line)
if errRead != nil {
if errRead != io.EOF {
return errRead
}
// Reached end of file, if nothing to read then break,
// otherwise handle the last line.
if len(line) == 0 {
break
}
}
// Found the line and copy rest of file.
if strings.Contains(line, fmt.Sprintf("key-%d", key.Id)) && strings.Contains(line, key.Content) {
continue
}
// Still finding the line, copy the line that currently read.
if _, err = fw.WriteString(line + "\n"); err != nil {
return err
}
if errRead == io.EOF {
break
}
}
if err = os.Remove(p); err != nil {
return err
}
return os.Rename(tmpP, p)
}
func ListPublicKey(userId int64) ([]PublicKey, error) {
keys := make([]PublicKey, 0)
err := orm.Find(&keys, &PublicKey{OwnerId: userId})
return keys, err
}
func SaveAuthorizedKeyFile(key *PublicKey) error {
sshOpLocker.Lock()
defer sshOpLocker.Unlock()
p := filepath.Join(sshPath, "authorized_keys")
f, err := os.OpenFile(p, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0600)
if err != nil {
return err
}
defer f.Close()
//os.Chmod(p, 0600)
_, err = f.WriteString(GenAuthorizedKey(key.Id, key.Content))
return err
}
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