gitea/models/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.
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package models
import (
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"bufio"
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"errors"
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"fmt"
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"io"
"io/ioutil"
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"os"
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"os/exec"
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"path"
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"path/filepath"
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"strings"
"sync"
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"time"
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"github.com/Unknwon/com"
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"github.com/gogits/gogs/modules/log"
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"github.com/gogits/gogs/modules/process"
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)
const (
// "### autogenerated by gitgos, DO NOT EDIT\n"
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_TPL_PUBLICK_KEY = `command="%s serv key-%d",no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty %s` + "\n"
)
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var (
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ErrKeyAlreadyExist = errors.New("Public key already exist")
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ErrKeyNotExist = errors.New("Public key does not exist")
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)
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var sshOpLocker = sync.Mutex{}
var (
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SshPath string // SSH directory.
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appPath string // Execution(binary) path.
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)
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// 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.
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func homeDir() string {
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home, err := com.HomeDir()
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if err != nil {
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log.Fatal("Fail to get home directory: %v", err)
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}
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return home
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}
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func init() {
var err error
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if appPath, err = exePath(); err != nil {
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log.Fatal("publickey.init(fail to get app path): %v\n", err)
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}
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// Determine and create .ssh path.
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SshPath = filepath.Join(homeDir(), ".ssh")
if err = os.MkdirAll(SshPath, os.ModePerm); err != nil {
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log.Fatal("publickey.init(fail to create SshPath(%s)): %v\n", SshPath, err)
}
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}
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// PublicKey represents a SSH key.
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type PublicKey struct {
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Id int64
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OwnerId int64 `xorm:"UNIQUE(s) INDEX NOT NULL"`
Name string `xorm:"UNIQUE(s) NOT NULL"`
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Fingerprint string
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Content string `xorm:"TEXT NOT NULL"`
Created time.Time `xorm:"CREATED"`
Updated time.Time `xorm:"UPDATED"`
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}
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// GetAuthorizedString generates and returns formatted public key string for authorized_keys file.
func (key *PublicKey) GetAuthorizedString() string {
return fmt.Sprintf(_TPL_PUBLICK_KEY, appPath, key.Id, key.Content)
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}
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// saveAuthorizedKeyFile writes SSH key content to authorized_keys file.
func saveAuthorizedKeyFile(key *PublicKey) error {
sshOpLocker.Lock()
defer sshOpLocker.Unlock()
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fpath := filepath.Join(SshPath, "authorized_keys")
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f, err := os.OpenFile(fpath, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0600)
if err != nil {
return err
}
defer f.Close()
_, err = f.WriteString(key.GetAuthorizedString())
return err
}
// AddPublicKey adds new public key to database and authorized_keys file.
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func AddPublicKey(key *PublicKey) (err error) {
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has, err := x.Get(key)
if err != nil {
return err
} else if has {
return ErrKeyAlreadyExist
}
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// Calculate fingerprint.
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tmpPath := strings.Replace(path.Join(os.TempDir(), fmt.Sprintf("%d", time.Now().Nanosecond()),
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"id_rsa.pub"), "\\", "/", -1)
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os.MkdirAll(path.Dir(tmpPath), os.ModePerm)
if err = ioutil.WriteFile(tmpPath, []byte(key.Content), os.ModePerm); err != nil {
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return err
}
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stdout, stderr, err := process.Exec("AddPublicKey", "ssh-keygen", "-l", "-f", tmpPath)
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if err != nil {
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return errors.New("ssh-keygen -l -f: " + stderr)
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} else if len(stdout) < 2 {
return errors.New("Not enough output for calculating fingerprint")
}
key.Fingerprint = strings.Split(stdout, " ")[1]
// Save SSH key.
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if _, err = x.Insert(key); err != nil {
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return err
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} else if err = saveAuthorizedKeyFile(key); err != nil {
// Roll back.
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if _, err2 := x.Delete(key); err2 != nil {
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return err2
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}
return err
}
return nil
}
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// ListPublicKey returns a list of all public keys that user has.
func ListPublicKey(uid int64) ([]PublicKey, error) {
keys := make([]PublicKey, 0, 5)
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err := x.Find(&keys, &PublicKey{OwnerId: uid})
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return keys, err
}
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// rewriteAuthorizedKeys finds and deletes corresponding line in authorized_keys file.
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func rewriteAuthorizedKeys(key *PublicKey, p, tmpP string) error {
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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()
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isFound := false
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keyword := fmt.Sprintf("key-%d", key.Id)
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
}
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}
// Found the line and copy rest of file.
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if !isFound && strings.Contains(line, keyword) && strings.Contains(line, key.Content) {
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isFound = true
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continue
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}
// Still finding the line, copy the line that currently read.
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if _, err = fw.WriteString(line + "\n"); err != nil {
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return err
}
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if errRead == io.EOF {
break
}
}
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return nil
}
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// DeletePublicKey deletes SSH key information both in database and authorized_keys file.
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func DeletePublicKey(key *PublicKey) error {
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has, err := x.Get(key)
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if err != nil {
return err
} else if !has {
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return ErrKeyNotExist
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}
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if _, err = x.Delete(key); err != nil {
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return err
}
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fpath := filepath.Join(SshPath, "authorized_keys")
tmpPath := filepath.Join(SshPath, "authorized_keys.tmp")
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log.Trace("publickey.DeletePublicKey(authorized_keys): %s", fpath)
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if err = rewriteAuthorizedKeys(key, fpath, tmpPath); err != nil {
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return err
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} else if err = os.Remove(fpath); err != nil {
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return err
}
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return os.Rename(tmpPath, fpath)
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}