339 lines
8.6 KiB
Go
339 lines
8.6 KiB
Go
// Copyright 2014 The Gogs Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package models
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import (
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"bufio"
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"errors"
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"fmt"
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"io"
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"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"
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"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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"github.com/gogits/gogs/modules/setting"
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)
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const (
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// "### 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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)
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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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ErrKeyUnableVerify = errors.New("Unable to verify public key")
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)
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var sshOpLocker = sync.Mutex{}
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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.
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func exePath() (string, error) {
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file, err := exec.LookPath(os.Args[0])
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if err != nil {
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return "", err
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}
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return filepath.Abs(file)
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}
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// 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(4, "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() {
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var err error
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if appPath, err = exePath(); err != nil {
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log.Fatal(4, "fail to get app path: %v\n", err)
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}
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appPath = strings.Replace(appPath, "\\", "/", -1)
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// Determine and create .ssh path.
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SshPath = filepath.Join(homeDir(), ".ssh")
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if err = os.MkdirAll(SshPath, 0700); err != nil {
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log.Fatal(4, "fail to create SshPath(%s): %v\n", SshPath, err)
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}
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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"`
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Name string `xorm:"UNIQUE(s) NOT NULL"`
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Fingerprint string `xorm:"INDEX NOT NULL"`
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Content string `xorm:"TEXT NOT NULL"`
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Created time.Time `xorm:"CREATED"`
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Updated time.Time
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HasRecentActivity bool `xorm:"-"`
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HasUsed bool `xorm:"-"`
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}
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// GetAuthorizedString generates and returns formatted public key string for authorized_keys file.
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func (key *PublicKey) GetAuthorizedString() string {
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return fmt.Sprintf(_TPL_PUBLICK_KEY, appPath, key.Id, key.Content)
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}
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var (
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MinimumKeySize = map[string]int{
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"(ED25519)": 256,
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"(ECDSA)": 256,
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"(NTRU)": 1087,
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"(MCE)": 1702,
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"(McE)": 1702,
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"(RSA)": 2048,
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"(DSA)": 1024,
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}
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)
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// CheckPublicKeyString checks if the given public key string is recognized by SSH.
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func CheckPublicKeyString(content string) (bool, error) {
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content = strings.TrimRight(content, "\n\r")
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if strings.ContainsAny(content, "\n\r") {
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return false, errors.New("only a single line with a single key please")
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}
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// write the key to a file…
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tmpFile, err := ioutil.TempFile(os.TempDir(), "keytest")
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if err != nil {
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return false, err
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}
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tmpPath := tmpFile.Name()
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defer os.Remove(tmpPath)
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tmpFile.WriteString(content)
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tmpFile.Close()
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// Check if ssh-keygen recognizes its contents.
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stdout, stderr, err := process.Exec("CheckPublicKeyString", "ssh-keygen", "-l", "-f", tmpPath)
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if err != nil {
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return false, errors.New("ssh-keygen -l -f: " + stderr)
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} else if len(stdout) < 2 {
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return false, errors.New("ssh-keygen returned not enough output to evaluate the key: " + stdout)
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}
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// The ssh-keygen in Windows does not print key type, so no need go further.
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if setting.IsWindows {
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return true, nil
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}
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fmt.Println(stdout)
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sshKeygenOutput := strings.Split(stdout, " ")
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if len(sshKeygenOutput) < 4 {
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return false, ErrKeyUnableVerify
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}
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// Check if key type and key size match.
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keySize := com.StrTo(sshKeygenOutput[0]).MustInt()
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if keySize == 0 {
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return false, errors.New("cannot get key size of the given key")
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}
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keyType := strings.TrimSpace(sshKeygenOutput[len(sshKeygenOutput)-1])
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if minimumKeySize := MinimumKeySize[keyType]; minimumKeySize == 0 {
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return false, errors.New("sorry, unrecognized public key type")
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} else if keySize < minimumKeySize {
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return false, fmt.Errorf("the minimum accepted size of a public key %s is %d", keyType, minimumKeySize)
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}
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return true, nil
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}
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// saveAuthorizedKeyFile writes SSH key content to authorized_keys file.
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func saveAuthorizedKeyFile(key *PublicKey) error {
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sshOpLocker.Lock()
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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)
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if err != nil {
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return err
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}
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defer f.Close()
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finfo, err := f.Stat()
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if err != nil {
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return err
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}
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// FIXME: following command does not support in Windows.
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if !setting.IsWindows {
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if finfo.Mode().Perm() > 0600 {
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log.Error(4, "authorized_keys file has unusual permission flags: %s - setting to -rw-------", finfo.Mode().Perm().String())
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if err = f.Chmod(0600); err != nil {
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return err
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}
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}
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}
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_, err = f.WriteString(key.GetAuthorizedString())
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return err
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}
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// 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)
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if err != nil {
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return err
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} else if has {
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return ErrKeyAlreadyExist
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}
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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)
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if err = ioutil.WriteFile(tmpPath, []byte(key.Content), os.ModePerm); err != nil {
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return err
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}
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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 {
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return errors.New("not enough output for calculating fingerprint: " + stdout)
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}
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key.Fingerprint = strings.Split(stdout, " ")[1]
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if has, err := x.Get(&PublicKey{Fingerprint: key.Fingerprint}); err == nil && has {
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return ErrKeyAlreadyExist
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}
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// 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 {
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// Roll back.
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if _, err2 := x.Delete(key); err2 != nil {
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return err2
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}
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return err
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}
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return nil
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}
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// GetPublicKeyById returns public key by given ID.
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func GetPublicKeyById(keyId int64) (*PublicKey, error) {
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key := new(PublicKey)
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has, err := x.Id(keyId).Get(key)
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if err != nil {
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return nil, err
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} else if !has {
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return nil, ErrKeyNotExist
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}
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return key, nil
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}
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// ListPublicKeys returns a list of public keys belongs to given user.
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func ListPublicKeys(uid int64) ([]*PublicKey, error) {
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keys := make([]*PublicKey, 0, 5)
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err := x.Where("owner_id=?", uid).Find(&keys)
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if err != nil {
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return nil, err
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}
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for _, key := range keys {
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key.HasUsed = key.Updated.After(key.Created)
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key.HasRecentActivity = key.Updated.Add(7 * 24 * time.Hour).After(time.Now())
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}
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return keys, nil
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}
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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()
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defer sshOpLocker.Unlock()
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fr, err := os.Open(p)
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if err != nil {
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return err
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}
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defer fr.Close()
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fw, err := os.OpenFile(tmpP, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0600)
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if err != nil {
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return err
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}
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defer fw.Close()
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isFound := false
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keyword := fmt.Sprintf("key-%d", key.Id)
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buf := bufio.NewReader(fr)
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for {
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line, errRead := buf.ReadString('\n')
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line = strings.TrimSpace(line)
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if errRead != nil {
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if errRead != io.EOF {
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return errRead
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}
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// Reached end of file, if nothing to read then break,
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// otherwise handle the last line.
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if len(line) == 0 {
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break
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}
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}
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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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}
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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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}
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if errRead == io.EOF {
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break
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}
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}
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return nil
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}
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// UpdatePublicKey updates given public key.
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func UpdatePublicKey(key *PublicKey) error {
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_, err := x.Id(key.Id).AllCols().Update(key)
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return err
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}
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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 {
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return err
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} 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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}
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fpath := filepath.Join(SshPath, "authorized_keys")
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tmpPath := filepath.Join(SshPath, "authorized_keys.tmp")
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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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}
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return os.Rename(tmpPath, fpath)
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}
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