freefire
822eef96be
作为 OIDC Provider 对接 Gitea；注册支持邮件验证码/验证码；侧栏同步公开仓库；Feed 分页、文章大纲、标签云与站点品牌设置。 Co-authored-by: Cursor <cursoragent@cursor.com>
635 lines
16 KiB
Go
635 lines
16 KiB
Go
package service
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import (
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"crypto/rand"
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"crypto/rsa"
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"crypto/sha256"
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"crypto/x509"
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"encoding/base64"
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"encoding/hex"
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"encoding/pem"
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"errors"
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"fmt"
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"net/url"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/golang-jwt/jwt/v5"
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"git.iioio.com/freefire/jiang13-forum/config"
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"git.iioio.com/freefire/jiang13-forum/model"
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)
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const (
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oidcAuthCodeTTL = 5 * time.Minute
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oidcAccessTokenTTL = time.Hour
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oidcIDTokenTTL = time.Hour
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oidcRSABits = 2048
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oidcKeyID = "jiang13-oidc-1"
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)
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var (
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ErrOIDCNotConfigured = errors.New("OIDC 未配置（请在管理后台启用并至少创建一个 OAuth 应用）")
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ErrOIDCInvalidClient = errors.New("无效的 client_id 或 client_secret")
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ErrOIDCInvalidRedirect = errors.New("redirect_uri 未登记")
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ErrOIDCInvalidRequest = errors.New("授权请求参数无效")
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ErrOIDCInvalidGrant = errors.New("授权码无效或已过期")
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ErrOIDCInvalidToken = errors.New("access_token 无效")
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ErrOIDCUserBanned = errors.New("账号已被禁言，无法授权")
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ErrOIDCPKCEFailed = errors.New("PKCE 校验失败")
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ErrOIDCInvalidLogout = errors.New("post_logout_redirect_uri 未登记")
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)
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// OIDCService 论坛作为 OpenID Connect Provider
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type OIDCService struct {
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cfg *config.Config
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settings *ForumSettingsService
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mu sync.RWMutex
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privateKey *rsa.PrivateKey
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}
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// NewOIDCService 创建并加载/生成 RSA 密钥
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func NewOIDCService(cfg *config.Config, settings *ForumSettingsService) (*OIDCService, error) {
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s := &OIDCService{cfg: cfg, settings: settings}
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if err := s.loadOrCreateKey(); err != nil {
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return nil, err
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}
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return s, nil
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}
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func (s *OIDCService) runtime() OIDCConfig {
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if s.settings != nil {
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return s.settings.OIDCConfig()
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}
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return OIDCConfig{}
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}
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func (s *OIDCService) loadOrCreateKey() error {
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keyPath := filepath.Join(s.cfg.DataDir, ".oidc_rsa.pem")
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if data, err := os.ReadFile(keyPath); err == nil && len(data) > 0 {
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block, _ := pem.Decode(data)
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if block == nil {
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return fmt.Errorf("解析 OIDC RSA 密钥失败")
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}
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key, err := x509.ParsePKCS1PrivateKey(block.Bytes)
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if err != nil {
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parsed, err2 := x509.ParsePKCS8PrivateKey(block.Bytes)
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if err2 != nil {
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return fmt.Errorf("解析 OIDC RSA 密钥失败: %w", err)
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}
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var ok bool
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key, ok = parsed.(*rsa.PrivateKey)
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if !ok {
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return fmt.Errorf("OIDC 密钥不是 RSA")
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}
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}
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s.privateKey = key
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return nil
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}
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key, err := rsa.GenerateKey(rand.Reader, oidcRSABits)
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if err != nil {
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return fmt.Errorf("生成 OIDC RSA 密钥失败: %w", err)
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}
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pemBytes := pem.EncodeToMemory(&pem.Block{
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Type: "RSA PRIVATE KEY",
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Bytes: x509.MarshalPKCS1PrivateKey(key),
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})
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if err := os.WriteFile(keyPath, pemBytes, 0600); err != nil {
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return fmt.Errorf("写入 OIDC RSA 密钥失败: %w", err)
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}
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s.privateKey = key
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return nil
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}
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// Enabled 是否可对外提供 OIDC
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func (s *OIDCService) Enabled() bool {
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return s.runtime().Ready
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}
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// Issuer 返回 OIDC issuer
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func (s *OIDCService) Issuer() string {
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return s.runtime().RootURL
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}
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// Discovery 返回 OpenID Provider Metadata
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func (s *OIDCService) Discovery() (map[string]any, error) {
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rt := s.runtime()
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if !rt.Ready {
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return nil, ErrOIDCNotConfigured
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}
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base := rt.RootURL
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return map[string]any{
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"issuer": base,
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"authorization_endpoint": base + "/oauth/authorize",
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"token_endpoint": base + "/oauth/token",
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"userinfo_endpoint": base + "/oauth/userinfo",
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"jwks_uri": base + "/oauth/jwks",
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"end_session_endpoint": base + "/oauth/logout",
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"response_types_supported": []string{"code"},
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"subject_types_supported": []string{"public"},
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"id_token_signing_alg_values_supported": []string{"RS256"},
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"scopes_supported": []string{"openid", "profile", "email", "groups"},
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"token_endpoint_auth_methods_supported": []string{"client_secret_basic", "client_secret_post"},
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"claims_supported": []string{
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"sub", "name", "preferred_username", "email", "email_verified", "picture", "groups",
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},
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"code_challenge_methods_supported": []string{"S256", "plain"},
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}, nil
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}
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// JWKS 返回 JSON Web Key Set
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func (s *OIDCService) JWKS() (map[string]any, error) {
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s.mu.RLock()
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key := s.privateKey
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s.mu.RUnlock()
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if key == nil {
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return nil, ErrOIDCNotConfigured
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}
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pub := key.PublicKey
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return map[string]any{
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"keys": []map[string]string{
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{
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"kty": "RSA",
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"use": "sig",
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"alg": "RS256",
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"kid": oidcKeyID,
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"n": base64.RawURLEncoding.EncodeToString(pub.N.Bytes()),
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"e": base64.RawURLEncoding.EncodeToString(bigIntBytes(pub.E)),
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},
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},
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}, nil
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}
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func bigIntBytes(e int) []byte {
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if e == 0 {
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return []byte{0}
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}
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var b []byte
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for v := e; v > 0; v >>= 8 {
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b = append([]byte{byte(v & 0xff)}, b...)
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}
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return b
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}
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// AuthorizeRequest 授权端点查询参数
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type AuthorizeRequest struct {
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ClientID string
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RedirectURI string
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ResponseType string
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Scope string
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State string
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Nonce string
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CodeChallenge string
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CodeChallengeMethod string
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}
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// ValidateAuthorize 校验授权请求（不要求已登录）
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func (s *OIDCService) ValidateAuthorize(req AuthorizeRequest) error {
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rt := s.runtime()
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if !rt.Ready {
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return ErrOIDCNotConfigured
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}
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client, err := FindEnabledOAuthClient(req.ClientID)
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if err != nil {
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return ErrOIDCInvalidClient
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}
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if req.ResponseType != "code" {
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return ErrOIDCInvalidRequest
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}
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if !redirectAllowed(client.RedirectURIs, req.RedirectURI) {
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return ErrOIDCInvalidRedirect
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}
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if !hasScope(req.Scope, "openid") {
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return ErrOIDCInvalidRequest
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}
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if req.CodeChallenge != "" {
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m := strings.ToUpper(req.CodeChallengeMethod)
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if m == "" {
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m = "PLAIN"
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}
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if m != "S256" && m != "PLAIN" {
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return ErrOIDCInvalidRequest
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}
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}
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return nil
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}
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func hasScope(scope, want string) bool {
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for _, p := range strings.Fields(scope) {
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if p == want {
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return true
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}
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}
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return false
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}
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func redirectAllowed(redirectURIsCSV, uri string) bool {
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for _, allowed := range splitRedirectURIs(redirectURIsCSV) {
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if allowed == uri {
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return true
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}
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}
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return false
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}
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// IssueAuthCode 已登录用户签发授权码，返回带 code/state 的回调 URL
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func (s *OIDCService) IssueAuthCode(userID uint, req AuthorizeRequest) (string, error) {
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if err := s.ValidateAuthorize(req); err != nil {
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return "", err
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}
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var user model.User
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if err := model.DB.First(&user, userID).Error; err != nil {
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return "", ErrOIDCInvalidRequest
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}
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if user.Banned {
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return "", ErrOIDCUserBanned
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}
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code, err := randomToken(32)
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if err != nil {
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return "", err
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}
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method := strings.ToUpper(req.CodeChallengeMethod)
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if req.CodeChallenge != "" && method == "" {
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method = "PLAIN"
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}
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rec := &model.OAuthAuthCode{
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Code: code,
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ClientID: req.ClientID,
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UserID: user.ID,
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RedirectURI: req.RedirectURI,
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Scope: req.Scope,
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Nonce: req.Nonce,
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CodeChallenge: req.CodeChallenge,
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CodeChallengeMethod: method,
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ExpiresAt: time.Now().Add(oidcAuthCodeTTL),
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}
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if err := model.DB.Create(rec).Error; err != nil {
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return "", err
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}
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u, err := url.Parse(req.RedirectURI)
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if err != nil {
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return "", ErrOIDCInvalidRedirect
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}
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q := u.Query()
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q.Set("code", code)
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if req.State != "" {
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q.Set("state", req.State)
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}
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u.RawQuery = q.Encode()
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return u.String(), nil
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}
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// TokenRequest 换票请求
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type TokenRequest struct {
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GrantType string
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Code string
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RedirectURI string
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ClientID string
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ClientSecret string
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CodeVerifier string
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}
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// TokenResponse OAuth token 响应
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type TokenResponse struct {
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AccessToken string `json:"access_token"`
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TokenType string `json:"token_type"`
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ExpiresIn int `json:"expires_in"`
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IDToken string `json:"id_token,omitempty"`
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Scope string `json:"scope,omitempty"`
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RefreshToken string `json:"refresh_token,omitempty"`
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}
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// ExchangeCode 授权码换 token
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func (s *OIDCService) ExchangeCode(req TokenRequest) (*TokenResponse, error) {
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rt := s.runtime()
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if !rt.Ready {
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return nil, ErrOIDCNotConfigured
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}
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if req.GrantType != "authorization_code" {
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return nil, ErrOIDCInvalidRequest
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}
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client, err := FindEnabledOAuthClient(req.ClientID)
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if err != nil || !VerifyOAuthClientSecret(client, req.ClientSecret) {
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return nil, ErrOIDCInvalidClient
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}
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var rec model.OAuthAuthCode
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if err := model.DB.Where("code = ?", req.Code).First(&rec).Error; err != nil {
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return nil, ErrOIDCInvalidGrant
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}
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if rec.Used || time.Now().After(rec.ExpiresAt) {
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// 重放：作废同用户同客户端未过期码
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if rec.Used {
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_ = model.DB.Model(&model.OAuthAuthCode{}).
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Where("client_id = ? AND user_id = ? AND used = ? AND expires_at > ?",
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rec.ClientID, rec.UserID, false, time.Now()).
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Update("used", true).Error
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}
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return nil, ErrOIDCInvalidGrant
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}
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if rec.ClientID != req.ClientID || rec.RedirectURI != req.RedirectURI {
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return nil, ErrOIDCInvalidGrant
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}
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if err := verifyPKCE(rec.CodeChallenge, rec.CodeChallengeMethod, req.CodeVerifier); err != nil {
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return nil, err
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}
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rec.Used = true
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_ = model.DB.Save(&rec).Error
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var user model.User
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if err := model.DB.First(&user, rec.UserID).Error; err != nil || user.Banned {
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return nil, ErrOIDCInvalidGrant
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}
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access, err := s.signAccessToken(&user, rec.Scope, req.ClientID)
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if err != nil {
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return nil, err
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}
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idToken, err := s.signIDToken(&user, rec.Scope, req.ClientID, rec.Nonce)
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if err != nil {
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return nil, err
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}
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return &TokenResponse{
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AccessToken: access,
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TokenType: "Bearer",
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ExpiresIn: int(oidcAccessTokenTTL.Seconds()),
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IDToken: idToken,
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Scope: rec.Scope,
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}, nil
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}
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func verifyPKCE(challenge, method, verifier string) error {
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if challenge == "" {
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return nil
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}
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if verifier == "" {
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return ErrOIDCPKCEFailed
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}
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switch strings.ToUpper(method) {
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case "S256":
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sum := sha256.Sum256([]byte(verifier))
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calc := base64.RawURLEncoding.EncodeToString(sum[:])
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if calc != challenge {
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return ErrOIDCPKCEFailed
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}
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case "PLAIN", "":
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if verifier != challenge {
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return ErrOIDCPKCEFailed
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}
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default:
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return ErrOIDCPKCEFailed
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}
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return nil
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}
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type oidcAccessClaims struct {
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Scope string `json:"scope,omitempty"`
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ClientID string `json:"client_id,omitempty"`
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jwt.RegisteredClaims
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}
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type oidcIDClaims struct {
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Name string `json:"name,omitempty"`
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PreferredUsername string `json:"preferred_username,omitempty"`
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Email string `json:"email,omitempty"`
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EmailVerified bool `json:"email_verified,omitempty"`
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Picture string `json:"picture,omitempty"`
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Groups []string `json:"groups,omitempty"`
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Nonce string `json:"nonce,omitempty"`
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jwt.RegisteredClaims
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}
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func (s *OIDCService) signAccessToken(user *model.User, scope, clientID string) (string, error) {
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now := time.Now()
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issuer := s.Issuer()
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claims := oidcAccessClaims{
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Scope: scope,
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ClientID: clientID,
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RegisteredClaims: jwt.RegisteredClaims{
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Issuer: issuer,
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Subject: strconv.FormatUint(uint64(user.ID), 10),
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Audience: []string{clientID},
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IssuedAt: jwt.NewNumericDate(now),
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ExpiresAt: jwt.NewNumericDate(now.Add(oidcAccessTokenTTL)),
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},
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}
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t := jwt.NewWithClaims(jwt.SigningMethodRS256, claims)
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t.Header["kid"] = oidcKeyID
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s.mu.RLock()
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defer s.mu.RUnlock()
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return t.SignedString(s.privateKey)
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}
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func (s *OIDCService) signIDToken(user *model.User, scope, clientID, nonce string) (string, error) {
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now := time.Now()
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issuer := s.Issuer()
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claims := oidcIDClaims{
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Nonce: nonce,
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Groups: s.userGroups(user),
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RegisteredClaims: jwt.RegisteredClaims{
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Issuer: issuer,
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Subject: strconv.FormatUint(uint64(user.ID), 10),
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Audience: []string{clientID},
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IssuedAt: jwt.NewNumericDate(now),
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ExpiresAt: jwt.NewNumericDate(now.Add(oidcIDTokenTTL)),
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},
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}
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if hasScope(scope, "profile") || scope == "" || hasScope(scope, "openid") {
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claims.Name = user.Nickname
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if claims.Name == "" {
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claims.Name = user.Username
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}
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claims.PreferredUsername = user.Username
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claims.Picture = s.absoluteURL(user.Avatar)
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}
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if hasScope(scope, "email") || hasScope(scope, "openid") {
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claims.Email = user.Email
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claims.EmailVerified = user.Email != ""
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}
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t := jwt.NewWithClaims(jwt.SigningMethodRS256, claims)
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t.Header["kid"] = oidcKeyID
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s.mu.RLock()
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defer s.mu.RUnlock()
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return t.SignedString(s.privateKey)
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}
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func (s *OIDCService) userGroups(user *model.User) []string {
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rt := s.runtime()
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groups := make([]string, 0, 2)
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if rt.UserGroup != "" {
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groups = append(groups, rt.UserGroup)
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}
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if user.Role == model.RoleAdmin && rt.AdminGroup != "" {
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groups = append(groups, rt.AdminGroup)
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}
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return groups
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}
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// UserInfo 根据 access_token 返回用户声明
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func (s *OIDCService) UserInfo(accessToken string) (map[string]any, error) {
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claims, err := s.parseAccessToken(accessToken)
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if err != nil {
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return nil, err
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}
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uid, err := strconv.ParseUint(claims.Subject, 10, 64)
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if err != nil {
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return nil, ErrOIDCInvalidToken
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}
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var user model.User
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if err := model.DB.First(&user, uint(uid)).Error; err != nil || user.Banned {
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return nil, ErrOIDCInvalidToken
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}
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rt := s.runtime()
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out := map[string]any{
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"sub": strconv.FormatUint(uint64(user.ID), 10),
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}
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if hasScope(claims.Scope, "profile") || claims.Scope == "" {
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name := user.Nickname
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if name == "" {
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name = user.Username
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}
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out["name"] = name
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out["preferred_username"] = user.Username
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if pic := s.absoluteURL(user.Avatar); pic != "" {
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out["picture"] = pic
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}
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}
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if hasScope(claims.Scope, "email") || hasScope(claims.Scope, "openid") {
|
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if user.Email != "" {
|
||
out["email"] = user.Email
|
||
out["email_verified"] = true
|
||
}
|
||
}
|
||
if _, ok := out["preferred_username"]; !ok {
|
||
out["preferred_username"] = user.Username
|
||
out["name"] = user.Nickname
|
||
if out["name"] == "" {
|
||
out["name"] = user.Username
|
||
}
|
||
}
|
||
groups := s.userGroups(&user)
|
||
if len(groups) > 0 {
|
||
claim := rt.GroupClaim
|
||
if claim == "" {
|
||
claim = "groups"
|
||
}
|
||
out[claim] = groups
|
||
if claim != "groups" {
|
||
out["groups"] = groups
|
||
}
|
||
}
|
||
return out, nil
|
||
}
|
||
|
||
// ResolveLogoutRedirect 校验并返回登出后跳转地址（空表示回首页）
|
||
func (s *OIDCService) ResolveLogoutRedirect(postLogoutRedirectURI, state string) (string, error) {
|
||
uri := strings.TrimSpace(postLogoutRedirectURI)
|
||
if uri == "" {
|
||
return "/", nil
|
||
}
|
||
var clients []model.OAuthClient
|
||
if err := model.DB.Where("enabled = ?", true).Find(&clients).Error; err != nil {
|
||
return "", err
|
||
}
|
||
allowed := false
|
||
for _, c := range clients {
|
||
if redirectAllowed(c.RedirectURIs, uri) {
|
||
allowed = true
|
||
break
|
||
}
|
||
// 允许同 host 下任意已登记前缀的登出回调（Gitea 常用 / 根路径）
|
||
for _, reg := range splitRedirectURIs(c.RedirectURIs) {
|
||
if sameOrigin(reg, uri) {
|
||
allowed = true
|
||
break
|
||
}
|
||
}
|
||
if allowed {
|
||
break
|
||
}
|
||
}
|
||
if !allowed {
|
||
return "", ErrOIDCInvalidLogout
|
||
}
|
||
u, err := url.Parse(uri)
|
||
if err != nil {
|
||
return "", ErrOIDCInvalidLogout
|
||
}
|
||
if state != "" {
|
||
q := u.Query()
|
||
q.Set("state", state)
|
||
u.RawQuery = q.Encode()
|
||
}
|
||
return u.String(), nil
|
||
}
|
||
|
||
func sameOrigin(a, b string) bool {
|
||
ua, err1 := url.Parse(a)
|
||
ub, err2 := url.Parse(b)
|
||
if err1 != nil || err2 != nil {
|
||
return false
|
||
}
|
||
return strings.EqualFold(ua.Scheme, ub.Scheme) && strings.EqualFold(ua.Host, ub.Host)
|
||
}
|
||
|
||
func (s *OIDCService) parseAccessToken(tokenStr string) (*oidcAccessClaims, error) {
|
||
s.mu.RLock()
|
||
key := s.privateKey
|
||
s.mu.RUnlock()
|
||
if key == nil {
|
||
return nil, ErrOIDCNotConfigured
|
||
}
|
||
tok, err := jwt.ParseWithClaims(tokenStr, &oidcAccessClaims{}, func(t *jwt.Token) (any, error) {
|
||
if t.Method != jwt.SigningMethodRS256 {
|
||
return nil, ErrOIDCInvalidToken
|
||
}
|
||
return &key.PublicKey, nil
|
||
})
|
||
if err != nil || !tok.Valid {
|
||
return nil, ErrOIDCInvalidToken
|
||
}
|
||
claims, ok := tok.Claims.(*oidcAccessClaims)
|
||
if !ok {
|
||
return nil, ErrOIDCInvalidToken
|
||
}
|
||
if claims.Issuer != s.Issuer() {
|
||
return nil, ErrOIDCInvalidToken
|
||
}
|
||
return claims, nil
|
||
}
|
||
|
||
func (s *OIDCService) absoluteURL(path string) string {
|
||
path = strings.TrimSpace(path)
|
||
if path == "" {
|
||
return ""
|
||
}
|
||
if strings.HasPrefix(path, "http://") || strings.HasPrefix(path, "https://") {
|
||
return path
|
||
}
|
||
if !strings.HasPrefix(path, "/") {
|
||
path = "/" + path
|
||
}
|
||
base := s.Issuer()
|
||
if base == "" {
|
||
return path
|
||
}
|
||
return base + path
|
||
}
|
||
|
||
func randomToken(nBytes int) (string, error) {
|
||
b := make([]byte, nBytes)
|
||
if _, err := rand.Read(b); err != nil {
|
||
return "", err
|
||
}
|
||
return hex.EncodeToString(b), nil
|
||
}
|