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bug: correctly generate oauth2 jwt signing key

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- When RS256, RS384, ES384, ES512 was specified as the JWT signing
algorithm they would generate RS512 and ES256 respectively.
- Added unit test.

(cherry picked from commit 7d59060dc6)
This commit is contained in:
Gusted 2024-11-16 14:57:02 +01:00 committed by forgejo-backport-action
parent 6569f1f25f
commit 90e05e7d52
2 changed files with 136 additions and 2 deletions
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22
services/auth/source/oauth2/jwtsigningkey.go
View file

@ -347,12 +347,30 @@ func loadOrCreateAsymmetricKey() (any, error) {
key, err := func() (any, error) {
switch {
case strings.HasPrefix(setting.OAuth2.JWTSigningAlgorithm, "RS"):
return rsa.GenerateKey(rand.Reader, 4096)
var bits int
switch setting.OAuth2.JWTSigningAlgorithm {
case "RS256":
bits = 2048
case "RS384":
bits = 3072
case "RS512":
bits = 4096
}
return rsa.GenerateKey(rand.Reader, bits)
case setting.OAuth2.JWTSigningAlgorithm == "EdDSA":
_, pk, err := ed25519.GenerateKey(rand.Reader)
return pk, err
default:
return ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
var curve elliptic.Curve
switch setting.OAuth2.JWTSigningAlgorithm {
case "ES256":
curve = elliptic.P256()
case "ES384":
curve = elliptic.P384()
case "ES512":
curve = elliptic.P521()
}
return ecdsa.GenerateKey(curve, rand.Reader)
}
}()
if err != nil {

116
services/auth/source/oauth2/jwtsigningkey_test.go Normal file
View file

@ -0,0 +1,116 @@
// Copyright 2024 The Forgejo Authors. All rights reserved.
// SPDX-License-Identifier: GPL-3.0-or-later
package oauth2
import (
"crypto/ecdsa"
"crypto/ed25519"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"os"
"path/filepath"
"testing"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/test"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestLoadOrCreateAsymmetricKey(t *testing.T) {
loadKey := func(t *testing.T) any {
t.Helper()
loadOrCreateAsymmetricKey()
fileContent, err := os.ReadFile(setting.OAuth2.JWTSigningPrivateKeyFile)
require.NoError(t, err)
block, _ := pem.Decode(fileContent)
assert.NotNil(t, block)
assert.EqualValues(t, "PRIVATE KEY", block.Type)
parsedKey, err := x509.ParsePKCS8PrivateKey(block.Bytes)
require.NoError(t, err)
return parsedKey
}
t.Run("RSA-2048", func(t *testing.T) {
defer test.MockVariableValue(&setting.OAuth2.JWTSigningPrivateKeyFile, filepath.Join(t.TempDir(), "jwt-rsa-2048.priv"))()
defer test.MockVariableValue(&setting.OAuth2.JWTSigningAlgorithm, "RS256")()
parsedKey := loadKey(t)
rsaPrivateKey := parsedKey.(*rsa.PrivateKey)
assert.EqualValues(t, 2048, rsaPrivateKey.N.BitLen())
t.Run("Load key with differ specified algorithm", func(t *testing.T) {
defer test.MockVariableValue(&setting.OAuth2.JWTSigningAlgorithm, "EdDSA")()
parsedKey := loadKey(t)
rsaPrivateKey := parsedKey.(*rsa.PrivateKey)
assert.EqualValues(t, 2048, rsaPrivateKey.N.BitLen())
})
})
t.Run("RSA-3072", func(t *testing.T) {
defer test.MockVariableValue(&setting.OAuth2.JWTSigningPrivateKeyFile, filepath.Join(t.TempDir(), "jwt-rsa-3072.priv"))()
defer test.MockVariableValue(&setting.OAuth2.JWTSigningAlgorithm, "RS384")()
parsedKey := loadKey(t)
rsaPrivateKey := parsedKey.(*rsa.PrivateKey)
assert.EqualValues(t, 3072, rsaPrivateKey.N.BitLen())
})
t.Run("RSA-4096", func(t *testing.T) {
defer test.MockVariableValue(&setting.OAuth2.JWTSigningPrivateKeyFile, filepath.Join(t.TempDir(), "jwt-rsa-4096.priv"))()
defer test.MockVariableValue(&setting.OAuth2.JWTSigningAlgorithm, "RS512")()
parsedKey := loadKey(t)
rsaPrivateKey := parsedKey.(*rsa.PrivateKey)
assert.EqualValues(t, 4096, rsaPrivateKey.N.BitLen())
})
t.Run("ECDSA-256", func(t *testing.T) {
defer test.MockVariableValue(&setting.OAuth2.JWTSigningPrivateKeyFile, filepath.Join(t.TempDir(), "jwt-ecdsa-256.priv"))()
defer test.MockVariableValue(&setting.OAuth2.JWTSigningAlgorithm, "ES256")()
parsedKey := loadKey(t)
ecdsaPrivateKey := parsedKey.(*ecdsa.PrivateKey)
assert.EqualValues(t, 256, ecdsaPrivateKey.Params().BitSize)
})
t.Run("ECDSA-384", func(t *testing.T) {
defer test.MockVariableValue(&setting.OAuth2.JWTSigningPrivateKeyFile, filepath.Join(t.TempDir(), "jwt-ecdsa-384.priv"))()
defer test.MockVariableValue(&setting.OAuth2.JWTSigningAlgorithm, "ES384")()
parsedKey := loadKey(t)
ecdsaPrivateKey := parsedKey.(*ecdsa.PrivateKey)
assert.EqualValues(t, 384, ecdsaPrivateKey.Params().BitSize)
})
t.Run("ECDSA-512", func(t *testing.T) {
defer test.MockVariableValue(&setting.OAuth2.JWTSigningPrivateKeyFile, filepath.Join(t.TempDir(), "jwt-ecdsa-512.priv"))()
defer test.MockVariableValue(&setting.OAuth2.JWTSigningAlgorithm, "ES512")()
parsedKey := loadKey(t)
ecdsaPrivateKey := parsedKey.(*ecdsa.PrivateKey)
assert.EqualValues(t, 521, ecdsaPrivateKey.Params().BitSize)
})
t.Run("EdDSA", func(t *testing.T) {
defer test.MockVariableValue(&setting.OAuth2.JWTSigningPrivateKeyFile, filepath.Join(t.TempDir(), "jwt-eddsa.priv"))()
defer test.MockVariableValue(&setting.OAuth2.JWTSigningAlgorithm, "EdDSA")()
parsedKey := loadKey(t)
assert.NotNil(t, parsedKey.(ed25519.PrivateKey))
})
}