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publickey.go
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publickey.go
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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"
"io/ioutil"
"os"
"os/exec"
"path"
"path/filepath"
"strings"
"sync"
"time"
"github.com/Unknwon/com"
"github.com/gogits/gogs/modules/log"
)
const (
// "### autogenerated by gitgos, DO NOT EDIT\n"
TPL_PUBLICK_KEY = `command="%s serv key-%d",no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty %s`
)
var (
ErrKeyAlreadyExist = errors.New("Public key already exist")
)
var sshOpLocker = sync.Mutex{}
var (
sshPath string
appPath string
)
// exePath returns the executable path.
func exePath() (string, error) {
file, err := exec.LookPath(os.Args[0])
if err != nil {
return "", err
}
return filepath.Abs(file)
}
// homeDir returns the home directory of current user.
func homeDir() string {
home, err := com.HomeDir()
if err != nil {
return "/"
}
return home
}
func init() {
var err error
appPath, err = exePath()
if err != nil {
fmt.Printf("publickey.init(fail to get app path): %v\n", err)
os.Exit(2)
}
// Determine and create .ssh path.
sshPath = filepath.Join(homeDir(), ".ssh")
if err = os.MkdirAll(sshPath, os.ModePerm); err != nil {
fmt.Printf("publickey.init(fail to create sshPath(%s)): %v\n", sshPath, err)
os.Exit(2)
}
}
// PublicKey represents a SSH key of user.
type PublicKey struct {
Id int64
OwnerId int64 `xorm:"unique(s) index not null"`
Name string `xorm:"unique(s) not null"`
Fingerprint string
Content string `xorm:"TEXT not null"`
Created time.Time `xorm:"created"`
Updated time.Time `xorm:"updated"`
}
// GenAuthorizedKey returns formatted public key string.
func GenAuthorizedKey(keyId int64, key string) string {
return fmt.Sprintf(TPL_PUBLICK_KEY+"\n", appPath, keyId, key)
}
// AddPublicKey adds new public key to database and SSH key file.
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 := strings.Replace(filepath.Join(os.TempDir(), fmt.Sprintf("%d", time.Now().Nanosecond()),
"id_rsa.pub"), "\\", "/", -1)
os.MkdirAll(path.Dir(tmpPath), os.ModePerm)
if err = ioutil.WriteFile(tmpPath, []byte(key.Content), os.ModePerm); err != nil {
return err
}
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
}
func rewriteAuthorizedKeys(key *PublicKey, p, tmpP string) error {
// Delete SSH key in SSH key file.
sshOpLocker.Lock()
defer sshOpLocker.Unlock()
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
}
}
return nil
}
// DeletePublicKey deletes SSH key information both in database and authorized_keys file.
func DeletePublicKey(key *PublicKey) (err error) {
// Delete SSH key in database.
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
}
p := filepath.Join(sshPath, "authorized_keys")
tmpP := filepath.Join(sshPath, "authorized_keys.tmp")
log.Trace("ssh.DeletePublicKey(authorized_keys): %s", p)
if err = rewriteAuthorizedKeys(key, p, tmpP); err != nil {
return err
} else if err = os.Remove(p); err != nil {
return err
}
return os.Rename(tmpP, p)
}
// ListPublicKey returns a list of public keys that user has.
func ListPublicKey(userId int64) ([]PublicKey, error) {
keys := make([]PublicKey, 0)
err := orm.Find(&keys, &PublicKey{OwnerId: userId})
return keys, err
}
// SaveAuthorizedKeyFile writes SSH key content to SSH key file.
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()
_, err = f.WriteString(GenAuthorizedKey(key.Id, key.Content))
return err
}