mirror of
https://github.com/go-gitea/gitea
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411 lines
9.5 KiB
Go
411 lines
9.5 KiB
Go
// Copyright 2021 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package oauth2
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import (
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"crypto/ecdsa"
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"crypto/ed25519"
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"crypto/elliptic"
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"encoding/base64"
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"encoding/pem"
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"fmt"
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"math/big"
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"os"
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"path/filepath"
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"strings"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/setting"
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"code.gitea.io/gitea/modules/util"
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"github.com/golang-jwt/jwt/v5"
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)
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// ErrInvalidAlgorithmType represents an invalid algorithm error.
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type ErrInvalidAlgorithmType struct {
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Algorithm string
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}
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func (err ErrInvalidAlgorithmType) Error() string {
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return fmt.Sprintf("JWT signing algorithm is not supported: %s", err.Algorithm)
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}
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// JWTSigningKey represents a algorithm/key pair to sign JWTs
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type JWTSigningKey interface {
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IsSymmetric() bool
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SigningMethod() jwt.SigningMethod
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SignKey() any
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VerifyKey() any
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ToJWK() (map[string]string, error)
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PreProcessToken(*jwt.Token)
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}
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type hmacSigningKey struct {
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signingMethod jwt.SigningMethod
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secret []byte
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}
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func (key hmacSigningKey) IsSymmetric() bool {
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return true
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}
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func (key hmacSigningKey) SigningMethod() jwt.SigningMethod {
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return key.signingMethod
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}
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func (key hmacSigningKey) SignKey() any {
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return key.secret
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}
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func (key hmacSigningKey) VerifyKey() any {
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return key.secret
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}
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func (key hmacSigningKey) ToJWK() (map[string]string, error) {
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return map[string]string{
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"kty": "oct",
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"alg": key.SigningMethod().Alg(),
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}, nil
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}
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func (key hmacSigningKey) PreProcessToken(*jwt.Token) {}
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type rsaSingingKey struct {
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signingMethod jwt.SigningMethod
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key *rsa.PrivateKey
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id string
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}
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func newRSASingingKey(signingMethod jwt.SigningMethod, key *rsa.PrivateKey) (rsaSingingKey, error) {
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kid, err := util.CreatePublicKeyFingerprint(key.Public().(*rsa.PublicKey))
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if err != nil {
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return rsaSingingKey{}, err
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}
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return rsaSingingKey{
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signingMethod,
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key,
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base64.RawURLEncoding.EncodeToString(kid),
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}, nil
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}
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func (key rsaSingingKey) IsSymmetric() bool {
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return false
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}
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func (key rsaSingingKey) SigningMethod() jwt.SigningMethod {
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return key.signingMethod
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}
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func (key rsaSingingKey) SignKey() any {
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return key.key
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}
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func (key rsaSingingKey) VerifyKey() any {
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return key.key.Public()
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}
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func (key rsaSingingKey) ToJWK() (map[string]string, error) {
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pubKey := key.key.Public().(*rsa.PublicKey)
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return map[string]string{
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"kty": "RSA",
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"alg": key.SigningMethod().Alg(),
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"kid": key.id,
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"e": base64.RawURLEncoding.EncodeToString(big.NewInt(int64(pubKey.E)).Bytes()),
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"n": base64.RawURLEncoding.EncodeToString(pubKey.N.Bytes()),
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}, nil
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}
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func (key rsaSingingKey) PreProcessToken(token *jwt.Token) {
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token.Header["kid"] = key.id
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}
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type eddsaSigningKey struct {
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signingMethod jwt.SigningMethod
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key ed25519.PrivateKey
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id string
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}
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func newEdDSASingingKey(signingMethod jwt.SigningMethod, key ed25519.PrivateKey) (eddsaSigningKey, error) {
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kid, err := util.CreatePublicKeyFingerprint(key.Public().(ed25519.PublicKey))
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if err != nil {
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return eddsaSigningKey{}, err
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}
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return eddsaSigningKey{
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signingMethod,
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key,
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base64.RawURLEncoding.EncodeToString(kid),
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}, nil
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}
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func (key eddsaSigningKey) IsSymmetric() bool {
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return false
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}
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func (key eddsaSigningKey) SigningMethod() jwt.SigningMethod {
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return key.signingMethod
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}
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func (key eddsaSigningKey) SignKey() any {
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return key.key
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}
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func (key eddsaSigningKey) VerifyKey() any {
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return key.key.Public()
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}
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func (key eddsaSigningKey) ToJWK() (map[string]string, error) {
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pubKey := key.key.Public().(ed25519.PublicKey)
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return map[string]string{
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"alg": key.SigningMethod().Alg(),
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"kid": key.id,
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"kty": "OKP",
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"crv": "Ed25519",
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"x": base64.RawURLEncoding.EncodeToString(pubKey),
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}, nil
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}
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func (key eddsaSigningKey) PreProcessToken(token *jwt.Token) {
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token.Header["kid"] = key.id
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}
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type ecdsaSingingKey struct {
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signingMethod jwt.SigningMethod
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key *ecdsa.PrivateKey
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id string
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}
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func newECDSASingingKey(signingMethod jwt.SigningMethod, key *ecdsa.PrivateKey) (ecdsaSingingKey, error) {
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kid, err := util.CreatePublicKeyFingerprint(key.Public().(*ecdsa.PublicKey))
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if err != nil {
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return ecdsaSingingKey{}, err
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}
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return ecdsaSingingKey{
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signingMethod,
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key,
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base64.RawURLEncoding.EncodeToString(kid),
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}, nil
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}
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func (key ecdsaSingingKey) IsSymmetric() bool {
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return false
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}
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func (key ecdsaSingingKey) SigningMethod() jwt.SigningMethod {
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return key.signingMethod
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}
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func (key ecdsaSingingKey) SignKey() any {
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return key.key
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}
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func (key ecdsaSingingKey) VerifyKey() any {
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return key.key.Public()
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}
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func (key ecdsaSingingKey) ToJWK() (map[string]string, error) {
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pubKey := key.key.Public().(*ecdsa.PublicKey)
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return map[string]string{
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"kty": "EC",
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"alg": key.SigningMethod().Alg(),
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"kid": key.id,
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"crv": pubKey.Params().Name,
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"x": base64.RawURLEncoding.EncodeToString(pubKey.X.Bytes()),
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"y": base64.RawURLEncoding.EncodeToString(pubKey.Y.Bytes()),
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}, nil
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}
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func (key ecdsaSingingKey) PreProcessToken(token *jwt.Token) {
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token.Header["kid"] = key.id
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}
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// CreateJWTSigningKey creates a signing key from an algorithm / key pair.
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func CreateJWTSigningKey(algorithm string, key any) (JWTSigningKey, error) {
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var signingMethod jwt.SigningMethod
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switch algorithm {
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case "HS256":
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signingMethod = jwt.SigningMethodHS256
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case "HS384":
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signingMethod = jwt.SigningMethodHS384
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case "HS512":
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signingMethod = jwt.SigningMethodHS512
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case "RS256":
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signingMethod = jwt.SigningMethodRS256
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case "RS384":
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signingMethod = jwt.SigningMethodRS384
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case "RS512":
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signingMethod = jwt.SigningMethodRS512
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case "ES256":
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signingMethod = jwt.SigningMethodES256
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case "ES384":
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signingMethod = jwt.SigningMethodES384
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case "ES512":
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signingMethod = jwt.SigningMethodES512
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case "EdDSA":
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signingMethod = jwt.SigningMethodEdDSA
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default:
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return nil, ErrInvalidAlgorithmType{algorithm}
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}
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switch signingMethod.(type) {
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case *jwt.SigningMethodEd25519:
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privateKey, ok := key.(ed25519.PrivateKey)
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if !ok {
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return nil, jwt.ErrInvalidKeyType
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}
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return newEdDSASingingKey(signingMethod, privateKey)
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case *jwt.SigningMethodECDSA:
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privateKey, ok := key.(*ecdsa.PrivateKey)
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if !ok {
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return nil, jwt.ErrInvalidKeyType
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}
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return newECDSASingingKey(signingMethod, privateKey)
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case *jwt.SigningMethodRSA:
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privateKey, ok := key.(*rsa.PrivateKey)
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if !ok {
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return nil, jwt.ErrInvalidKeyType
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}
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return newRSASingingKey(signingMethod, privateKey)
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default:
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secret, ok := key.([]byte)
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if !ok {
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return nil, jwt.ErrInvalidKeyType
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}
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return hmacSigningKey{signingMethod, secret}, nil
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}
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}
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// DefaultSigningKey is the default signing key for JWTs.
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var DefaultSigningKey JWTSigningKey
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// InitSigningKey creates the default signing key from settings or creates a random key.
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func InitSigningKey() error {
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var err error
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var key any
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switch setting.OAuth2.JWTSigningAlgorithm {
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case "HS256":
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fallthrough
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case "HS384":
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fallthrough
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case "HS512":
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key, err = loadSymmetricKey()
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case "RS256":
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fallthrough
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case "RS384":
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fallthrough
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case "RS512":
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fallthrough
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case "ES256":
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fallthrough
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case "ES384":
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fallthrough
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case "ES512":
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fallthrough
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case "EdDSA":
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key, err = loadOrCreateAsymmetricKey()
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default:
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return ErrInvalidAlgorithmType{setting.OAuth2.JWTSigningAlgorithm}
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}
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if err != nil {
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return fmt.Errorf("Error while loading or creating JWT key: %w", err)
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}
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signingKey, err := CreateJWTSigningKey(setting.OAuth2.JWTSigningAlgorithm, key)
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if err != nil {
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return err
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}
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DefaultSigningKey = signingKey
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return nil
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}
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// loadSymmetricKey checks if the configured secret is valid.
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// If it is not valid, it will return an error.
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func loadSymmetricKey() (any, error) {
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return util.Base64FixedDecode(base64.RawURLEncoding, []byte(setting.OAuth2.JWTSecretBase64), 32)
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}
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// loadOrCreateAsymmetricKey checks if the configured private key exists.
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// If it does not exist a new random key gets generated and saved on the configured path.
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func loadOrCreateAsymmetricKey() (any, error) {
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keyPath := setting.OAuth2.JWTSigningPrivateKeyFile
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isExist, err := util.IsExist(keyPath)
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if err != nil {
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log.Fatal("Unable to check if %s exists. Error: %v", keyPath, err)
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}
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if !isExist {
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err := func() error {
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key, err := func() (any, error) {
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switch {
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case strings.HasPrefix(setting.OAuth2.JWTSigningAlgorithm, "RS"):
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return rsa.GenerateKey(rand.Reader, 4096)
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case setting.OAuth2.JWTSigningAlgorithm == "EdDSA":
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_, pk, err := ed25519.GenerateKey(rand.Reader)
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return pk, err
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default:
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return ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
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}
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}()
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if err != nil {
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return err
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}
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bytes, err := x509.MarshalPKCS8PrivateKey(key)
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if err != nil {
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return err
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}
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privateKeyPEM := &pem.Block{Type: "PRIVATE KEY", Bytes: bytes}
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if err := os.MkdirAll(filepath.Dir(keyPath), os.ModePerm); err != nil {
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return err
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}
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f, err := os.OpenFile(keyPath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0o600)
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if err != nil {
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return err
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}
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defer func() {
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if err = f.Close(); err != nil {
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log.Error("Close: %v", err)
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}
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}()
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return pem.Encode(f, privateKeyPEM)
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}()
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if err != nil {
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log.Fatal("Error generating private key: %v", err)
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return nil, err
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}
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}
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bytes, err := os.ReadFile(keyPath)
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if err != nil {
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return nil, err
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}
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block, _ := pem.Decode(bytes)
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if block == nil {
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return nil, fmt.Errorf("no valid PEM data found in %s", keyPath)
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} else if block.Type != "PRIVATE KEY" {
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return nil, fmt.Errorf("expected PRIVATE KEY, got %s in %s", block.Type, keyPath)
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}
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return x509.ParsePKCS8PrivateKey(block.Bytes)
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}
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