mirror of
https://github.com/go-gitea/gitea.git
synced 2024-08-21 12:03:26 +02:00
675 lines
17 KiB
Go
675 lines
17 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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"encoding/base64"
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"encoding/binary"
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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/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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)
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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 --config='%s'",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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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 '%s': %v", SSHPath, err)
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}
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}
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type KeyType int
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const (
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KEY_TYPE_USER = iota + 1
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KEY_TYPE_DEPLOY
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)
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// PublicKey represents a SSH or deploy key.
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type PublicKey struct {
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ID int64 `xorm:"pk autoincr"`
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OwnerID int64 `xorm:"INDEX NOT NULL"`
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Name string `xorm:"NOT NULL"`
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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"`
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Type KeyType `xorm:"NOT NULL DEFAULT 1"`
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Created time.Time `xorm:"CREATED"`
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Updated time.Time // Note: Updated must below Created for AfterSet.
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HasRecentActivity bool `xorm:"-"`
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HasUsed bool `xorm:"-"`
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}
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func (k *PublicKey) AfterSet(colName string, _ xorm.Cell) {
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switch colName {
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case "created":
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k.HasUsed = k.Updated.After(k.Created)
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k.HasRecentActivity = k.Updated.Add(7 * 24 * time.Hour).After(time.Now())
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}
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}
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// OmitEmail returns content of public key but without e-mail address.
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func (k *PublicKey) OmitEmail() string {
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return strings.Join(strings.Split(k.Content, " ")[:2], " ")
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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, setting.CustomConf, key.Content)
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}
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var minimumKeySizes = 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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func extractTypeFromBase64Key(key string) (string, error) {
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b, err := base64.StdEncoding.DecodeString(key)
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if err != nil || len(b) < 4 {
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return "", errors.New("Invalid key format")
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}
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keyLength := int(binary.BigEndian.Uint32(b))
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if len(b) < 4+keyLength {
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return "", errors.New("Invalid key format")
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}
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return string(b[4 : 4+keyLength]), nil
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}
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// parseKeyString parses any key string in openssh or ssh2 format to clean openssh string (rfc4253)
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func parseKeyString(content string) (string, error) {
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// Transform all legal line endings to a single "\n"
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s := strings.Replace(strings.Replace(strings.TrimSpace(content), "\r\n", "\n", -1), "\r", "\n", -1)
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lines := strings.Split(s, "\n")
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var keyType, keyContent, keyComment string
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if len(lines) == 1 {
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// Parse openssh format
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parts := strings.Fields(lines[0])
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switch len(parts) {
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case 0:
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return "", errors.New("Empty key")
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case 1:
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keyContent = parts[0]
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case 2:
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keyType = parts[0]
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keyContent = parts[1]
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default:
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keyType = parts[0]
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keyContent = parts[1]
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keyComment = parts[2]
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}
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// If keyType is not given, extract it from content. If given, validate it
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if len(keyType) == 0 {
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if t, err := extractTypeFromBase64Key(keyContent); err == nil {
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keyType = t
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} else {
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return "", err
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}
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} else {
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if t, err := extractTypeFromBase64Key(keyContent); err != nil || keyType != t {
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return "", err
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}
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}
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} else {
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// Parse SSH2 file format.
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continuationLine := false
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for _, line := range lines {
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// Skip lines that:
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// 1) are a continuation of the previous line,
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// 2) contain ":" as that are comment lines
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// 3) contain "-" as that are begin and end tags
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if continuationLine || strings.ContainsAny(line, ":-") {
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continuationLine = strings.HasSuffix(line, "\\")
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} else {
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keyContent = keyContent + line
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}
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}
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if t, err := extractTypeFromBase64Key(keyContent); err == nil {
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keyType = t
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} else {
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return "", err
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}
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}
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return keyType + " " + keyContent + " " + keyComment, nil
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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) (_ string, err error) {
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content, err = parseKeyString(content)
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if err != nil {
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return "", err
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}
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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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}
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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 "", 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 "", 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.
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if setting.IsWindows {
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return content, nil
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}
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sshKeygenOutput := strings.Split(stdout, " ")
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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.
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if !setting.Service.DisableMinimumKeySizeCheck {
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keySize := com.StrTo(sshKeygenOutput[0]).MustInt()
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if keySize == 0 {
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return "", 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 := minimumKeySizes[keyType]; minimumKeySize == 0 {
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return "", errors.New("sorry, unrecognized public key type")
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} 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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}
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return content, nil
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}
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// saveAuthorizedKeyFile writes SSH key content to authorized_keys file.
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func saveAuthorizedKeyFile(keys ...*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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fi, 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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// .ssh directory should have mode 700, and authorized_keys file should have mode 600.
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if fi.Mode().Perm() > 0600 {
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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 {
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return err
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}
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}
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}
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for _, key := range keys {
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if _, err = f.WriteString(key.GetAuthorizedString()); err != nil {
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return err
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}
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}
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return nil
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}
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func checkKeyContent(content string) error {
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// Same key can only be added once.
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has, err := x.Where("content=?", content).Get(new(PublicKey))
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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{0, content}
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}
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return nil
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}
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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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}
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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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// Save SSH key.
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if _, err = e.Insert(key); err != nil {
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return err
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}
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return saveAuthorizedKeyFile(key)
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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(ownerID int64, name, content string) (err error) {
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if err = checkKeyContent(content); err != nil {
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return err
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}
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// Key name of same user cannot be duplicated.
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has, err := x.Where("owner_id=? AND name=?", ownerID, name).Get(new(PublicKey))
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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 ErrKeyNameAlreadyUsed{ownerID, name}
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}
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sess := x.NewSession()
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defer sessionRelease(sess)
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if err = sess.Begin(); err != nil {
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return err
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}
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key := &PublicKey{
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OwnerID: ownerID,
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Name: name,
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Content: content,
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Mode: ACCESS_MODE_WRITE,
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Type: KEY_TYPE_USER,
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}
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if err = addKey(sess, key); err != nil {
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return fmt.Errorf("addKey: %v", err)
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}
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return sess.Commit()
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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{keyID}
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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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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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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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func deletePublicKey(e *xorm.Session, key *PublicKey) error {
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has, err := e.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 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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}
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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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// DeletePublicKey deletes SSH key information both in database and authorized_keys file.
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func DeletePublicKey(key *PublicKey) (err error) {
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sess := x.NewSession()
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defer sessionRelease(sess)
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if err = sess.Begin(); err != nil {
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return err
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}
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if err = deletePublicKey(sess, key); err != nil {
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return err
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}
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return sess.Commit()
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}
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// RewriteAllPublicKeys removes any authorized key and rewrite all keys from database again.
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func RewriteAllPublicKeys() error {
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sshOpLocker.Lock()
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defer sshOpLocker.Unlock()
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tmpPath := filepath.Join(SSHPath, "authorized_keys.tmp")
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f, err := os.OpenFile(tmpPath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
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if err != nil {
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return err
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}
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defer os.Remove(tmpPath)
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err = x.Iterate(new(PublicKey), func(idx int, bean interface{}) (err error) {
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_, err = f.WriteString((bean.(*PublicKey)).GetAuthorizedString())
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return err
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})
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f.Close()
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if 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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if com.IsExist(fpath) {
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if err = os.Remove(fpath); err != nil {
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return err
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}
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}
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if err = os.Rename(tmpPath, fpath); err != nil {
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return err
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}
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return nil
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}
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// ________ .__ ____ __.
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// \______ \ ____ ______ | | ____ ___.__.| |/ _|____ ___.__.
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// | | \_/ __ \\____ \| | / _ < | || <_/ __ < | |
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// | ` \ ___/| |_> > |_( <_> )___ || | \ ___/\___ |
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// /_______ /\___ > __/|____/\____// ____||____|__ \___ > ____|
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// \/ \/|__| \/ \/ \/\/
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// DeployKey represents deploy key information and its relation with repository.
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type DeployKey struct {
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ID int64 `xorm:"pk autoincr"`
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KeyID int64 `xorm:"UNIQUE(s) INDEX"`
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RepoID int64 `xorm:"UNIQUE(s) INDEX"`
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Name string
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Fingerprint string
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Created time.Time `xorm:"CREATED"`
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Updated time.Time // Note: Updated must below Created for AfterSet.
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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)
|
|
}
|