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Use general token signing secret (#29205) (#29325) 

Backport #29205 (including #29172)

Use a clearly defined "signing secret" for token signing.
pull/29327/head
wxiaoguang 2024-02-23 01:07:41 +07:00 committed by GitHub
parent 7ea2ffaf16
commit 511298e452
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
13 changed files with 130 additions and 70 deletions
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2
cmd/generate.go
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@ -70,7 +70,7 @@ func runGenerateInternalToken(c *cli.Context) error {
}
func runGenerateLfsJwtSecret(c *cli.Context) error {
_, jwtSecretBase64, err := generate.NewJwtSecretBase64()
_, jwtSecretBase64, err := generate.NewJwtSecretWithBase64()
if err != nil {
return err
}

2
modules/base/tool.go
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@ -129,7 +129,7 @@ func CreateTimeLimitCode(data string, minutes int, startInf any) string {
// create sha1 encode string
sh := sha1.New()
_, _ = sh.Write([]byte(fmt.Sprintf("%s%s%s%s%d", data, setting.SecretKey, startStr, endStr, minutes)))
_, _ = sh.Write([]byte(fmt.Sprintf("%s%s%s%s%d", data, hex.EncodeToString(setting.GetGeneralTokenSigningSecret()), startStr, endStr, minutes)))
encoded := hex.EncodeToString(sh.Sum(nil))
code := fmt.Sprintf("%s%06d%s", startStr, minutes, encoded)

3
modules/context/context.go
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@ -6,6 +6,7 @@ package context
import (
"context"
"encoding/hex"
"html"
"html/template"
"io"
@ -134,7 +135,7 @@ func NewWebContext(base *Base, render Render, session session.Store) *Context {
func Contexter() func(next http.Handler) http.Handler {
rnd := templates.HTMLRenderer()
csrfOpts := CsrfOptions{
Secret: setting.SecretKey,
Secret: hex.EncodeToString(setting.GetGeneralTokenSigningSecret()),
Cookie: setting.CSRFCookieName,
SetCookie: true,
Secure: setting.SessionConfig.Secure,

24
modules/generate/generate.go
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@ -7,6 +7,7 @@ package generate
import (
"crypto/rand"
"encoding/base64"
"fmt"
"io"
"time"
@ -38,19 +39,24 @@ func NewInternalToken() (string, error) {
return internalToken, nil
}
// NewJwtSecret generates a new value intended to be used for JWT secrets.
func NewJwtSecret() ([]byte, error) {
bytes := make([]byte, 32)
_, err := io.ReadFull(rand.Reader, bytes)
if err != nil {
const defaultJwtSecretLen = 32
// DecodeJwtSecretBase64 decodes a base64 encoded jwt secret into bytes, and check its length
func DecodeJwtSecretBase64(src string) ([]byte, error) {
encoding := base64.RawURLEncoding
decoded := make([]byte, encoding.DecodedLen(len(src))+3)
if n, err := encoding.Decode(decoded, []byte(src)); err != nil {
return nil, err
} else if n != defaultJwtSecretLen {
return nil, fmt.Errorf("invalid base64 decoded length: %d, expects: %d", n, defaultJwtSecretLen)
}
return bytes, nil
return decoded[:defaultJwtSecretLen], nil
}
// NewJwtSecretBase64 generates a new base64 encoded value intended to be used for JWT secrets.
func NewJwtSecretBase64() ([]byte, string, error) {
bytes, err := NewJwtSecret()
// NewJwtSecretWithBase64 generates a jwt secret with its base64 encoded value intended to be used for saving into config file
func NewJwtSecretWithBase64() ([]byte, string, error) {
bytes := make([]byte, defaultJwtSecretLen)
_, err := io.ReadFull(rand.Reader, bytes)
if err != nil {
return nil, "", err
}

34
modules/generate/generate_test.go
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@ -0,0 +1,34 @@
// Copyright 2024 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package generate
import (
"encoding/base64"
"strings"
"testing"
"github.com/stretchr/testify/assert"
)
func TestDecodeJwtSecretBase64(t *testing.T) {
_, err := DecodeJwtSecretBase64("abcd")
assert.ErrorContains(t, err, "invalid base64 decoded length")
_, err = DecodeJwtSecretBase64(strings.Repeat("a", 64))
assert.ErrorContains(t, err, "invalid base64 decoded length")
str32 := strings.Repeat("x", 32)
encoded32 := base64.RawURLEncoding.EncodeToString([]byte(str32))
decoded32, err := DecodeJwtSecretBase64(encoded32)
assert.NoError(t, err)
assert.Equal(t, str32, string(decoded32))
}
func TestNewJwtSecretWithBase64(t *testing.T) {
secret, encoded, err := NewJwtSecretWithBase64()
assert.NoError(t, err)
assert.Len(t, secret, 32)
decoded, err := DecodeJwtSecretBase64(encoded)
assert.NoError(t, err)
assert.Equal(t, secret, decoded)
}

23
modules/setting/lfs.go
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@ -4,22 +4,19 @@
package setting
import (
"encoding/base64"
"fmt"
"time"
"code.gitea.io/gitea/modules/generate"
"code.gitea.io/gitea/modules/util"
)
// LFS represents the configuration for Git LFS
var LFS = struct {
StartServer bool `ini:"LFS_START_SERVER"`
JWTSecretBase64 string `ini:"LFS_JWT_SECRET"`
JWTSecretBytes []byte `ini:"-"`
HTTPAuthExpiry time.Duration `ini:"LFS_HTTP_AUTH_EXPIRY"`
MaxFileSize int64 `ini:"LFS_MAX_FILE_SIZE"`
LocksPagingNum int `ini:"LFS_LOCKS_PAGING_NUM"`
StartServer bool `ini:"LFS_START_SERVER"`
JWTSecretBytes []byte `ini:"-"`
HTTPAuthExpiry time.Duration `ini:"LFS_HTTP_AUTH_EXPIRY"`
MaxFileSize int64 `ini:"LFS_MAX_FILE_SIZE"`
LocksPagingNum int `ini:"LFS_LOCKS_PAGING_NUM"`
Storage *Storage
}{}
@ -61,10 +58,10 @@ func loadLFSFrom(rootCfg ConfigProvider) error {
return nil
}
LFS.JWTSecretBase64 = loadSecret(rootCfg.Section("server"), "LFS_JWT_SECRET_URI", "LFS_JWT_SECRET")
LFS.JWTSecretBytes, err = util.Base64FixedDecode(base64.RawURLEncoding, []byte(LFS.JWTSecretBase64), 32)
jwtSecretBase64 := loadSecret(rootCfg.Section("server"), "LFS_JWT_SECRET_URI", "LFS_JWT_SECRET")
LFS.JWTSecretBytes, err = generate.DecodeJwtSecretBase64(jwtSecretBase64)
if err != nil {
LFS.JWTSecretBytes, LFS.JWTSecretBase64, err = generate.NewJwtSecretBase64()
LFS.JWTSecretBytes, jwtSecretBase64, err = generate.NewJwtSecretWithBase64()
if err != nil {
return fmt.Errorf("error generating JWT Secret for custom config: %v", err)
}
@ -74,8 +71,8 @@ func loadLFSFrom(rootCfg ConfigProvider) error {
if err != nil {
return fmt.Errorf("error saving JWT Secret for custom config: %v", err)
}
rootCfg.Section("server").Key("LFS_JWT_SECRET").SetValue(LFS.JWTSecretBase64)
saveCfg.Section("server").Key("LFS_JWT_SECRET").SetValue(LFS.JWTSecretBase64)
rootCfg.Section("server").Key("LFS_JWT_SECRET").SetValue(jwtSecretBase64)
saveCfg.Section("server").Key("LFS_JWT_SECRET").SetValue(jwtSecretBase64)
if err := saveCfg.Save(); err != nil {
return fmt.Errorf("error saving JWT Secret for custom config: %v", err)
}

39
modules/setting/oauth2.go
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@ -4,13 +4,12 @@
package setting
import (
"encoding/base64"
"math"
"path/filepath"
"sync/atomic"
"code.gitea.io/gitea/modules/generate"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/util"
)
// OAuth2UsernameType is enum describing the way gitea 'name' should be generated from oauth2 data
@ -98,7 +97,6 @@ var OAuth2 = struct {
RefreshTokenExpirationTime int64
InvalidateRefreshTokens bool
JWTSigningAlgorithm string `ini:"JWT_SIGNING_ALGORITHM"`
JWTSecretBase64 string `ini:"JWT_SECRET"`
JWTSigningPrivateKeyFile string `ini:"JWT_SIGNING_PRIVATE_KEY_FILE"`
MaxTokenLength int
DefaultApplications []string
@ -123,29 +121,50 @@ func loadOAuth2From(rootCfg ConfigProvider) {
return
}
OAuth2.JWTSecretBase64 = loadSecret(rootCfg.Section("oauth2"), "JWT_SECRET_URI", "JWT_SECRET")
jwtSecretBase64 := loadSecret(rootCfg.Section("oauth2"), "JWT_SECRET_URI", "JWT_SECRET")
if !filepath.IsAbs(OAuth2.JWTSigningPrivateKeyFile) {
OAuth2.JWTSigningPrivateKeyFile = filepath.Join(AppDataPath, OAuth2.JWTSigningPrivateKeyFile)
}
if InstallLock {
if _, err := util.Base64FixedDecode(base64.RawURLEncoding, []byte(OAuth2.JWTSecretBase64), 32); err != nil {
key, err := generate.NewJwtSecret()
jwtSecretBytes, err := generate.DecodeJwtSecretBase64(jwtSecretBase64)
if err != nil {
jwtSecretBytes, jwtSecretBase64, err = generate.NewJwtSecretWithBase64()
if err != nil {
log.Fatal("error generating JWT secret: %v", err)
}
OAuth2.JWTSecretBase64 = base64.RawURLEncoding.EncodeToString(key)
saveCfg, err := rootCfg.PrepareSaving()
if err != nil {
log.Fatal("save oauth2.JWT_SECRET failed: %v", err)
}
rootCfg.Section("oauth2").Key("JWT_SECRET").SetValue(OAuth2.JWTSecretBase64)
saveCfg.Section("oauth2").Key("JWT_SECRET").SetValue(OAuth2.JWTSecretBase64)
rootCfg.Section("oauth2").Key("JWT_SECRET").SetValue(jwtSecretBase64)
saveCfg.Section("oauth2").Key("JWT_SECRET").SetValue(jwtSecretBase64)
if err := saveCfg.Save(); err != nil {
log.Fatal("save oauth2.JWT_SECRET failed: %v", err)
}
}
generalSigningSecret.Store(&jwtSecretBytes)
}
}
// generalSigningSecret is used as container for a []byte value
// instead of an additional mutex, we use CompareAndSwap func to change the value thread save
var generalSigningSecret atomic.Pointer[[]byte]
func GetGeneralTokenSigningSecret() []byte {
old := generalSigningSecret.Load()
if old == nil || len(*old) == 0 {
jwtSecret, _, err := generate.NewJwtSecretWithBase64()
if err != nil {
log.Fatal("Unable to generate general JWT secret: %s", err.Error())
}
if generalSigningSecret.CompareAndSwap(old, &jwtSecret) {
// FIXME: in main branch, the signing token should be refactored (eg: one unique for LFS/OAuth2/etc ...)
log.Warn("OAuth2 is not enabled, unable to use a persistent signing secret, a new one is generated, which is not persistent between restarts and cluster nodes")
return jwtSecret
}
return *generalSigningSecret.Load()
}
return *old
}

34
modules/setting/oauth2_test.go
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@ -0,0 +1,34 @@
// Copyright 2024 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package setting
import (
"testing"
"code.gitea.io/gitea/modules/generate"
"code.gitea.io/gitea/modules/test"
"github.com/stretchr/testify/assert"
)
func TestGetGeneralSigningSecret(t *testing.T) {
// when there is no general signing secret, it should be generated, and keep the same value
assert.Nil(t, generalSigningSecret.Load())
s1 := GetGeneralTokenSigningSecret()
assert.NotNil(t, s1)
s2 := GetGeneralTokenSigningSecret()
assert.Equal(t, s1, s2)
// the config value should always override any pre-generated value
cfg, _ := NewConfigProviderFromData(`
[oauth2]
JWT_SECRET = BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
`)
defer test.MockVariableValue(&InstallLock, true)()
loadOAuth2From(cfg)
actual := GetGeneralTokenSigningSecret()
expected, _ := generate.DecodeJwtSecretBase64("BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB")
assert.Len(t, actual, 32)
assert.EqualValues(t, expected, actual)
}

11
modules/util/util.go
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@ -6,7 +6,6 @@ package util
import (
"bytes"
"crypto/rand"
"encoding/base64"
"fmt"
"math/big"
"strconv"
@ -246,13 +245,3 @@ func ToFloat64(number any) (float64, error) {
func ToPointer[T any](val T) *T {
return &val
}
func Base64FixedDecode(encoding *base64.Encoding, src []byte, length int) ([]byte, error) {
decoded := make([]byte, encoding.DecodedLen(len(src))+3)
if n, err := encoding.Decode(decoded, src); err != nil {
return nil, err
} else if n != length {
return nil, fmt.Errorf("invalid base64 decoded length: %d, expects: %d", n, length)
}
return decoded[:length], nil
}

14
modules/util/util_test.go
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@ -4,7 +4,6 @@
package util
import (
"encoding/base64"
"regexp"
"strings"
"testing"
@ -234,16 +233,3 @@ func TestToPointer(t *testing.T) {
val123 := 123
assert.False(t, &val123 == ToPointer(val123))
}
func TestBase64FixedDecode(t *testing.T) {
_, err := Base64FixedDecode(base64.RawURLEncoding, []byte("abcd"), 32)
assert.ErrorContains(t, err, "invalid base64 decoded length")
_, err = Base64FixedDecode(base64.RawURLEncoding, []byte(strings.Repeat("a", 64)), 32)
assert.ErrorContains(t, err, "invalid base64 decoded length")
str32 := strings.Repeat("x", 32)
encoded32 := base64.RawURLEncoding.EncodeToString([]byte(str32))
decoded32, err := Base64FixedDecode(base64.RawURLEncoding, []byte(encoded32), 32)
assert.NoError(t, err)
assert.Equal(t, str32, string(decoded32))
}

2
routers/install/install.go
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@ -407,7 +407,7 @@ func SubmitInstall(ctx *context.Context) {
cfg.Section("server").Key("LFS_START_SERVER").SetValue("true")
cfg.Section("lfs").Key("PATH").SetValue(form.LFSRootPath)
var lfsJwtSecret string
if _, lfsJwtSecret, err = generate.NewJwtSecretBase64(); err != nil {
if _, lfsJwtSecret, err = generate.NewJwtSecretWithBase64(); err != nil {
ctx.RenderWithErr(ctx.Tr("install.lfs_jwt_secret_failed", err), tplInstall, &form)
return
}

8
services/auth/source/oauth2/jwtsigningkey.go
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@ -300,7 +300,7 @@ func InitSigningKey() error {
case "HS384":
fallthrough
case "HS512":
key, err = loadSymmetricKey()
key = setting.GetGeneralTokenSigningSecret()
case "RS256":
fallthrough
case "RS384":
@ -333,12 +333,6 @@ func InitSigningKey() error {
return nil
}
// loadSymmetricKey checks if the configured secret is valid.
// If it is not valid, it will return an error.
func loadSymmetricKey() (any, error) {
return util.Base64FixedDecode(base64.RawURLEncoding, []byte(setting.OAuth2.JWTSecretBase64), 32)
}
// loadOrCreateAsymmetricKey checks if the configured private key exists.
// If it does not exist a new random key gets generated and saved on the configured path.
func loadOrCreateAsymmetricKey() (any, error) {

4
services/packages/auth.go
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@ -33,7 +33,7 @@ func CreateAuthorizationToken(u *user_model.User) (string, error) {
}
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
tokenString, err := token.SignedString([]byte(setting.SecretKey))
tokenString, err := token.SignedString(setting.GetGeneralTokenSigningSecret())
if err != nil {
return "", err
}
@ -57,7 +57,7 @@ func ParseAuthorizationToken(req *http.Request) (int64, error) {
if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("unexpected signing method: %v", t.Header["alg"])
}
return []byte(setting.SecretKey), nil
return setting.GetGeneralTokenSigningSecret(), nil
})
if err != nil {
return 0, err