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"
"encoding/base64"
"encoding/binary"
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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/go-xorm/xorm"
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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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)
const (
// "### autogenerated by gitgos, DO NOT EDIT\n"
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_TPL_PUBLICK_KEY = `command="%s serv key-%d --config='%s'",no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty %s` + "\n"
)
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var (
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ErrKeyUnableVerify = errors.New("Unable to verify public key")
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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(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() {
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")
if err = os.MkdirAll(SSHPath, 0700); err != nil {
log.Fatal(4, "fail to create '%s': %v", SSHPath, err)
}
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}
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type KeyType int
const (
KEY_TYPE_USER = iota + 1
KEY_TYPE_DEPLOY
)
// PublicKey represents a SSH or deploy key.
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type PublicKey struct {
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ID int64 `xorm:"pk autoincr"`
OwnerID int64 `xorm:"INDEX NOT NULL"`
Name string `xorm:"NOT NULL"`
Fingerprint string `xorm:"NOT NULL"`
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Content string `xorm:"TEXT NOT NULL"`
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Mode AccessMode `xorm:"NOT NULL DEFAULT 2"`
Type KeyType `xorm:"NOT NULL DEFAULT 1"`
Created time.Time `xorm:"CREATED"`
Updated time.Time // Note: Updated must below Created for AfterSet.
HasRecentActivity bool `xorm:"-"`
HasUsed bool `xorm:"-"`
}
func (k *PublicKey) AfterSet(colName string, _ xorm.Cell) {
switch colName {
case "created":
k.HasUsed = k.Updated.After(k.Created)
k.HasRecentActivity = k.Updated.Add(7 * 24 * time.Hour).After(time.Now())
}
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}
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// OmitEmail returns content of public key but without e-mail address.
func (k *PublicKey) OmitEmail() string {
return strings.Join(strings.Split(k.Content, " ")[:2], " ")
}
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// GetAuthorizedString generates and returns formatted public key string for authorized_keys file.
func (key *PublicKey) GetAuthorizedString() string {
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return fmt.Sprintf(_TPL_PUBLICK_KEY, appPath, key.ID, setting.CustomConf, key.Content)
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}
var minimumKeySizes = map[string]int{
"(ED25519)": 256,
"(ECDSA)": 256,
"(NTRU)": 1087,
"(MCE)": 1702,
"(McE)": 1702,
"(RSA)": 2048,
"(DSA)": 1024,
}
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func extractTypeFromBase64Key(key string) (string, error) {
b, err := base64.StdEncoding.DecodeString(key)
if err != nil || len(b) < 4 {
return "", errors.New("Invalid key format")
}
keyLength := int(binary.BigEndian.Uint32(b))
if len(b) < 4+keyLength {
return "", errors.New("Invalid key format")
}
return string(b[4 : 4+keyLength]), nil
}
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// parseKeyString parses any key string in openssh or ssh2 format to clean openssh string (rfc4253)
func parseKeyString(content string) (string, error) {
// Transform all legal line endings to a single "\n"
s := strings.Replace(strings.Replace(strings.TrimSpace(content), "\r\n", "\n", -1), "\r", "\n", -1)
lines := strings.Split(s, "\n")
var keyType, keyContent, keyComment string
if len(lines) == 1 {
// Parse openssh format
parts := strings.Fields(lines[0])
switch len(parts) {
case 0:
return "", errors.New("Empty key")
case 1:
keyContent = parts[0]
case 2:
keyType = parts[0]
keyContent = parts[1]
default:
keyType = parts[0]
keyContent = parts[1]
keyComment = parts[2]
}
// If keyType is not given, extract it from content. If given, validate it
if len(keyType) == 0 {
if t, err := extractTypeFromBase64Key(keyContent); err == nil {
keyType = t
} else {
return "", err
}
} else {
if t, err := extractTypeFromBase64Key(keyContent); err != nil || keyType != t {
return "", err
}
}
} else {
// Parse SSH2 file format.
continuationLine := false
for _, line := range lines {
// Skip lines that:
// 1) are a continuation of the previous line,
// 2) contain ":" as that are comment lines
// 3) contain "-" as that are begin and end tags
if continuationLine || strings.ContainsAny(line, ":-") {
continuationLine = strings.HasSuffix(line, "\\")
} else {
keyContent = keyContent + line
}
}
if t, err := extractTypeFromBase64Key(keyContent); err == nil {
keyType = t
} else {
return "", err
}
}
return keyType + " " + keyContent + " " + keyComment, nil
}
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// CheckPublicKeyString checks if the given public key string is recognized by SSH.
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func CheckPublicKeyString(content string) (_ string, err error) {
content, err = parseKeyString(content)
if err != nil {
return "", err
}
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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 "", errors.New("only a single line with a single key please")
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}
// write the key to a file…
tmpFile, err := ioutil.TempFile(os.TempDir(), "keytest")
if err != nil {
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return "", err
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}
tmpPath := tmpFile.Name()
defer os.Remove(tmpPath)
tmpFile.WriteString(content)
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)
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("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.
if setting.IsWindows {
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return content, nil
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}
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sshKeygenOutput := strings.Split(stdout, " ")
if len(sshKeygenOutput) < 4 {
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return content, ErrKeyUnableVerify
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}
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// Check if key type and key size match.
if !setting.Service.DisableMinimumKeySizeCheck {
keySize := com.StrTo(sshKeygenOutput[0]).MustInt()
if keySize == 0 {
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return "", errors.New("cannot get key size of the given key")
}
keyType := strings.TrimSpace(sshKeygenOutput[len(sshKeygenOutput)-1])
if minimumKeySize := minimumKeySizes[keyType]; minimumKeySize == 0 {
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return "", errors.New("sorry, unrecognized public key type")
} else if keySize < minimumKeySize {
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return "", fmt.Errorf("the minimum accepted size of a public key %s is %d", keyType, minimumKeySize)
}
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}
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return content, nil
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}
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// saveAuthorizedKeyFile writes SSH key content to authorized_keys file.
func saveAuthorizedKeyFile(keys ...*PublicKey) error {
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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()
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fi, err := f.Stat()
if err != nil {
return err
}
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// FIXME: following command does not support in Windows.
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if !setting.IsWindows {
// .ssh directory should have mode 700, and authorized_keys file should have mode 600.
if fi.Mode().Perm() > 0600 {
log.Error(4, "authorized_keys file has unusual permission flags: %s - setting to -rw-------", fi.Mode().Perm().String())
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if err = f.Chmod(0600); err != nil {
return err
}
}
}
for _, key := range keys {
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if _, err = f.WriteString(key.GetAuthorizedString()); err != nil {
return err
}
}
return nil
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}
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func checkKeyContent(content string) error {
// Same key can only be added once.
has, err := x.Where("content=?", content).Get(new(PublicKey))
if err != nil {
return err
} else if has {
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return ErrKeyAlreadyExist{0, content}
}
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return nil
}
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func addKey(e Engine, key *PublicKey) (err error) {
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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), 0644); 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 {
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return errors.New("not enough output for calculating fingerprint: " + stdout)
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}
key.Fingerprint = strings.Split(stdout, " ")[1]
// Save SSH key.
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if _, err = e.Insert(key); err != nil {
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return err
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}
return saveAuthorizedKeyFile(key)
}
// AddPublicKey adds new public key to database and authorized_keys file.
func AddPublicKey(ownerID int64, name, content string) (err error) {
if err = checkKeyContent(content); err != nil {
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return err
}
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// Key name of same user cannot be duplicated.
has, err := x.Where("owner_id=? AND name=?", ownerID, name).Get(new(PublicKey))
if err != nil {
return err
} else if has {
return ErrKeyNameAlreadyUsed{ownerID, name}
}
sess := x.NewSession()
defer sessionRelease(sess)
if err = sess.Begin(); err != nil {
return err
}
key := &PublicKey{
OwnerID: ownerID,
Name: name,
Content: content,
Mode: ACCESS_MODE_WRITE,
Type: KEY_TYPE_USER,
}
if err = addKey(sess, key); err != nil {
return fmt.Errorf("addKey: %v", err)
}
return sess.Commit()
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}
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// GetPublicKeyByID returns public key by given ID.
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 {
return nil, err
} else if !has {
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return nil, ErrKeyNotExist{keyID}
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}
return key, nil
}
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// ListPublicKeys returns a list of public keys belongs to given user.
func ListPublicKeys(uid int64) ([]*PublicKey, error) {
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keys := make([]*PublicKey, 0, 5)
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return keys, x.Where("owner_id=?", uid).Find(&keys)
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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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fr, err := os.Open(p)
if err != nil {
return err
}
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 {
return err
}
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)
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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// UpdatePublicKey updates given public key.
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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func deletePublicKey(e *xorm.Session, key *PublicKey) error {
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sshOpLocker.Lock()
defer sshOpLocker.Unlock()
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has, err := e.Get(key)
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if err != nil {
return err
} else if !has {
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return nil
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}
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if _, err = e.Id(key.ID).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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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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}
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// DeletePublicKey deletes SSH key information both in database and authorized_keys file.
func DeletePublicKey(key *PublicKey) (err error) {
sess := x.NewSession()
defer sessionRelease(sess)
if err = sess.Begin(); err != nil {
return err
}
if err = deletePublicKey(sess, key); err != nil {
return err
}
return sess.Commit()
}
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// RewriteAllPublicKeys removes any authorized key and rewrite all keys from database again.
func RewriteAllPublicKeys() error {
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sshOpLocker.Lock()
defer sshOpLocker.Unlock()
tmpPath := filepath.Join(SSHPath, "authorized_keys.tmp")
f, err := os.OpenFile(tmpPath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return err
}
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defer os.Remove(tmpPath)
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err = x.Iterate(new(PublicKey), func(idx int, bean interface{}) (err error) {
_, err = f.WriteString((bean.(*PublicKey)).GetAuthorizedString())
return err
})
f.Close()
if err != nil {
return err
}
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fpath := filepath.Join(SSHPath, "authorized_keys")
if com.IsExist(fpath) {
if err = os.Remove(fpath); err != nil {
return err
}
}
if err = os.Rename(tmpPath, fpath); err != nil {
return err
}
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return nil
}
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// ________ .__ ____ __.
// \______ \ ____ ______ | | ____ ___.__.| |/ _|____ ___.__.
// | | \_/ __ \\____ \| | / _ < | || <_/ __ < | |
// | ` \ ___/| |_> > |_( <_> )___ || | \ ___/\___ |
// /_______ /\___ > __/|____/\____// ____||____|__ \___ > ____|
// \/ \/|__| \/ \/ \/\/
// DeployKey represents deploy key information and its relation with repository.
type DeployKey struct {
ID int64 `xorm:"pk autoincr"`
KeyID int64 `xorm:"UNIQUE(s) INDEX"`
RepoID int64 `xorm:"UNIQUE(s) INDEX"`
Name string
Fingerprint string
Created time.Time `xorm:"CREATED"`
Updated time.Time // Note: Updated must below Created for AfterSet.
HasRecentActivity bool `xorm:"-"`
HasUsed bool `xorm:"-"`
}
func (k *DeployKey) AfterSet(colName string, _ xorm.Cell) {
switch colName {
case "created":
k.HasUsed = k.Updated.After(k.Created)
k.HasRecentActivity = k.Updated.Add(7 * 24 * time.Hour).After(time.Now())
}
}
func checkDeployKey(e Engine, keyID, repoID int64, name string) error {
// Note: We want error detail, not just true or false here.
has, err := e.Where("key_id=? AND repo_id=?", keyID, repoID).Get(new(DeployKey))
if err != nil {
return err
} else if has {
return ErrDeployKeyAlreadyExist{keyID, repoID}
}
has, err = e.Where("repo_id=? AND name=?", repoID, name).Get(new(DeployKey))
if err != nil {
return err
} else if has {
return ErrDeployKeyNameAlreadyUsed{repoID, name}
}
return nil
}
// addDeployKey adds new key-repo relation.
func addDeployKey(e *xorm.Session, keyID, repoID int64, name, fingerprint string) (err error) {
if err = checkDeployKey(e, keyID, repoID, name); err != nil {
return err
}
_, err = e.Insert(&DeployKey{
KeyID: keyID,
RepoID: repoID,
Name: name,
Fingerprint: fingerprint,
})
return err
}
// HasDeployKey returns true if public key is a deploy key of given repository.
func HasDeployKey(keyID, repoID int64) bool {
has, _ := x.Where("key_id=? AND repo_id=?", keyID, repoID).Get(new(DeployKey))
return has
}
// AddDeployKey add new deploy key to database and authorized_keys file.
func AddDeployKey(repoID int64, name, content string) (err error) {
if err = checkKeyContent(content); err != nil {
return err
}
key := &PublicKey{
Content: content,
Mode: ACCESS_MODE_READ,
Type: KEY_TYPE_DEPLOY,
}
has, err := x.Get(key)
if err != nil {
return err
}
sess := x.NewSession()
defer sessionRelease(sess)
if err = sess.Begin(); err != nil {
return err
}
// First time use this deploy key.
if !has {
if err = addKey(sess, key); err != nil {
return nil
}
}
if err = addDeployKey(sess, key.ID, repoID, name, key.Fingerprint); err != nil {
return err
}
return sess.Commit()
}
// GetDeployKeyByRepo returns deploy key by given public key ID and repository ID.
func GetDeployKeyByRepo(keyID, repoID int64) (*DeployKey, error) {
key := &DeployKey{
KeyID: keyID,
RepoID: repoID,
}
_, err := x.Get(key)
return key, err
}
// UpdateDeployKey updates deploy key information.
func UpdateDeployKey(key *DeployKey) error {
_, err := x.Id(key.ID).AllCols().Update(key)
return err
}
// DeleteDeployKey deletes deploy key from its repository authorized_keys file if needed.
func DeleteDeployKey(id int64) error {
key := &DeployKey{ID: id}
has, err := x.Id(key.ID).Get(key)
if err != nil {
return err
} else if !has {
return nil
}
sess := x.NewSession()
defer sessionRelease(sess)
if err = sess.Begin(); err != nil {
return err
}
if _, err = sess.Id(key.ID).Delete(key); err != nil {
return fmt.Errorf("delete deploy key[%d]: %v", key.ID, err)
}
// Check if this is the last reference to same key content.
has, err = sess.Where("key_id=?", key.KeyID).Get(new(DeployKey))
if err != nil {
return err
} else if !has {
if err = deletePublicKey(sess, &PublicKey{ID: key.KeyID}); err != nil {
return err
}
}
return sess.Commit()
}
// ListDeployKeys returns all deploy keys by given repository ID.
func ListDeployKeys(repoID int64) ([]*DeployKey, error) {
keys := make([]*DeployKey, 0, 5)
return keys, x.Where("repo_id=?", repoID).Find(&keys)
}