feat(observability): 增加 OIDC 失败关联诊断

将 OIDC Access Token 与 ID Token 校验失败映射为固定安全分类，并生成 diagnosticId 关联浏览器错误与服务端日志。日志不记录授权码、Token 或底层敏感输入，且保留 errors.Is(ErrUnauthorized) 兼容语义。

验证：go test ./... -count=1（apps/api）

apps/api/internal/auth/oidc.go

@@ -132,15 +132,28 @@ func (v *OIDCVerifier) Verify(ctx context.Context, raw string) (*User, error) {
 	parser := jwt.NewParser(jwt.WithValidMethods([]string{"RS256", "ES256"}))
 	unverified, _, err := parser.ParseUnverified(raw, jwt.MapClaims{})
 	if err != nil || unverified == nil {
-		return nil, oidcUnauthorized("token envelope is invalid", err)
+		return nil, oidcUnauthorized("TOKEN_ENVELOPE_INVALID", "token envelope is invalid", err)
+	}
+	unverifiedClaims, ok := unverified.Claims.(jwt.MapClaims)
+	if !ok {
+		return nil, oidcUnauthorized("TOKEN_ENVELOPE_INVALID", "token envelope is invalid", nil)
+	}
+	if stringClaim(unverifiedClaims, "iss") == "" {
+		return nil, oidcUnauthorized("ISSUER_MISSING", "issuer is missing", nil)
+	}
+	if len(stringSliceClaim(unverifiedClaims, "aud")) == 0 {
+		return nil, oidcUnauthorized("AUDIENCE_MISSING", "audience is missing", nil)
+	}
+	if _, exists := unverifiedClaims["exp"]; !exists {
+		return nil, oidcUnauthorized("EXP_MISSING", "exp is missing", nil)
 	}
 	kid, _ := unverified.Header["kid"].(string)
 	if kid == "" {
-		return nil, oidcUnauthorized("kid is missing", nil)
+		return nil, oidcUnauthorized("KID_MISSING", "kid is missing", nil)
 	}
 	key, err := v.key(ctx, kid)
 	if err != nil {
-		return nil, oidcUnauthorized("signing key lookup failed", err)
+		return nil, oidcUnauthorized("SIGNING_KEY_LOOKUP_FAILED", "signing key lookup failed", err)
 	}
 	token, err := jwt.Parse(raw, func(token *jwt.Token) (any, error) {
 		if token.Header["kid"] != kid {
@@ -150,30 +163,30 @@ func (v *OIDCVerifier) Verify(ctx context.Context, raw string) (*User, error) {
 	}, jwt.WithValidMethods([]string{"RS256", "ES256"}), jwt.WithIssuer(v.config.Issuer),
 		jwt.WithAudience(v.config.Audience), jwt.WithExpirationRequired(), jwt.WithLeeway(30*time.Second))
 	if err != nil || !token.Valid {
-		return nil, oidcUnauthorized("signature or registered claims are invalid", err)
+		return nil, oidcUnauthorized(registeredClaimsValidationCategory(err), "signature or registered claims are invalid", err)
 	}
 	claims, ok := token.Claims.(jwt.MapClaims)
 	if !ok || stringClaim(claims, "sub") == "" || stringClaim(claims, "tid") != v.config.TenantID {
-		return nil, oidcUnauthorized("stable identity claims are invalid", nil)
+		return nil, oidcUnauthorized("STABLE_IDENTITY_CLAIMS_INVALID", "stable identity claims are invalid", nil)
 	}
 	expiresAt, ok := numericDateClaim(claims["exp"])
 	if !ok {
-		return nil, oidcUnauthorized("exp is invalid", nil)
+		return nil, oidcUnauthorized("EXP_INVALID", "exp is invalid", nil)
 	}
 	if _, ok := numericDateClaim(claims["nbf"]); !ok {
-		return nil, oidcUnauthorized("nbf is missing", nil)
+		return nil, oidcUnauthorized("NBF_MISSING", "nbf is missing", nil)
 	}
 	issuedAt, hasIssuedAt := numericDateClaim(claims["iat"])
 	scopes := scopeClaims(claims)
 	if !containsAll(scopes, v.config.RequiredScopes) {
-		return nil, oidcUnauthorized("required scope is missing", nil)
+		return nil, oidcUnauthorized("REQUIRED_SCOPE_MISSING", "required scope is missing", nil)
 	}
 	roles := gatewayRoles(stringSliceClaim(claims, "roles"), v.config.RolePrefix)
 	if len(roles) == 0 {
 		roles = gatewayRoles(stringSliceClaim(claims, "role"), v.config.RolePrefix)
 	}
 	if len(roles) == 0 {
-		return nil, oidcUnauthorized("mapped role is missing", nil)
+		return nil, oidcUnauthorized("MAPPED_ROLE_MISSING", "mapped role is missing", nil)
 	}
 	if v.config.SecurityEventEvaluator != nil {
 		evaluation, evaluateErr := v.config.SecurityEventEvaluator(ctx, OIDCSecurityEventIdentity{
@@ -183,10 +196,10 @@ func (v *OIDCVerifier) Verify(ctx context.Context, raw string) (*User, error) {
 			return nil, NewRequestAuthError(http.StatusServiceUnavailable, "OIDC_SECURITY_EVENT_STATE_UNAVAILABLE", "认证撤销状态暂时不可用")
 		}
 		if evaluation.Enabled && !hasIssuedAt {
-			return nil, oidcUnauthorized("iat is required when security events are enabled", nil)
+			return nil, oidcUnauthorized("SECURITY_EVENT_IAT_MISSING", "iat is required when security events are enabled", nil)
 		}
 		if evaluation.Revoked {
-			return nil, oidcUnauthorized("token was issued before the revocation watermark", nil)
+			return nil, oidcUnauthorized("TOKEN_REVOKED", "token was issued before the revocation watermark", nil)
 		}
 		if evaluation.RequireIntrospection {
 			active, introspectionErr := v.introspect(ctx, raw)
@@ -194,18 +207,18 @@ func (v *OIDCVerifier) Verify(ctx context.Context, raw string) (*User, error) {
 				return nil, NewRequestAuthError(http.StatusServiceUnavailable, "OIDC_INTROSPECTION_UNAVAILABLE", "认证中心内省暂时不可用")
 			}
 			if !active {
-				return nil, oidcUnauthorized("token is inactive", nil)
+				return nil, oidcUnauthorized("TOKEN_INACTIVE", "token is inactive", nil)
 			}
 		} else if !evaluation.Enabled && v.config.IntrospectionEnabled {
 			active, introspectionErr := v.introspect(ctx, raw)
 			if introspectionErr != nil || !active {
-				return nil, oidcUnauthorized("token is inactive", introspectionErr)
+				return nil, oidcUnauthorized("TOKEN_INACTIVE", "token is inactive", introspectionErr)
 			}
 		}
 	} else if v.config.IntrospectionEnabled {
 		active, err := v.introspect(ctx, raw)
 		if err != nil || !active {
-			return nil, oidcUnauthorized("token is inactive", err)
+			return nil, oidcUnauthorized("TOKEN_INACTIVE", "token is inactive", err)
 		}
 	}
 	username := stringClaim(claims, "preferred_username")
@@ -218,11 +231,67 @@ func (v *OIDCVerifier) Verify(ctx context.Context, raw string) (*User, error) {
 	}, nil
 }
 
-func oidcUnauthorized(reason string, cause error) error {
-	if cause != nil {
-		return fmt.Errorf("%w: %s: %v", ErrUnauthorized, reason, cause)
+type oidcValidationError struct {
+	category string
+	reason   string
+	cause    error
+}
+
+func (err *oidcValidationError) Error() string {
+	if err.cause != nil {
+		return fmt.Sprintf("%v: %s: %v", ErrUnauthorized, err.reason, err.cause)
+	}
+	return fmt.Sprintf("%v: %s", ErrUnauthorized, err.reason)
+}
+
+func (err *oidcValidationError) Unwrap() []error {
+	if err.cause == nil {
+		return []error{ErrUnauthorized}
+	}
+	return []error{ErrUnauthorized, err.cause}
+}
+
+func OIDCValidationCategory(err error) string {
+	var validationError *oidcValidationError
+	if errors.As(err, &validationError) {
+		return validationError.category
+	}
+	return "UNCLASSIFIED"
+}
+
+func registeredClaimsValidationCategory(err error) string {
+	switch {
+	case errors.Is(err, jwt.ErrTokenRequiredClaimMissing):
+		return "REQUIRED_CLAIM_MISSING"
+	case errors.Is(err, jwt.ErrTokenInvalidAudience):
+		return "AUDIENCE_INVALID"
+	case errors.Is(err, jwt.ErrTokenInvalidIssuer):
+		return "ISSUER_INVALID"
+	case errors.Is(err, jwt.ErrTokenExpired):
+		return "TOKEN_EXPIRED"
+	case errors.Is(err, jwt.ErrTokenNotValidYet):
+		return "TOKEN_NOT_VALID_YET"
+	case errors.Is(err, jwt.ErrTokenUsedBeforeIssued):
+		return "TOKEN_USED_BEFORE_ISSUED"
+	case errors.Is(err, jwt.ErrTokenSignatureInvalid):
+		return "SIGNATURE_INVALID"
+	case errors.Is(err, jwt.ErrTokenMalformed):
+		return "TOKEN_MALFORMED"
+	case errors.Is(err, jwt.ErrTokenUnverifiable):
+		return "TOKEN_UNVERIFIABLE"
+	case errors.Is(err, jwt.ErrTokenInvalidClaims):
+		return "CLAIMS_INVALID"
+	default:
+		return "REGISTERED_CLAIMS_INVALID"
+	}
+}
+
+func oidcUnauthorized(category, reason string, cause error) error {
+	return &oidcValidationError{
+		category: category,
+		reason:   reason,
+		cause:    cause,
 	}
-	return fmt.Errorf("%w: %s", ErrUnauthorized, reason)
 }
 
 func (v *OIDCVerifier) key(ctx context.Context, kid string) (any, error) {

apps/api/internal/auth/oidc_client.go

@@ -121,30 +121,30 @@ func (c *OIDCPublicClient) Refresh(ctx context.Context, refreshToken string) (OI
 func (c *OIDCPublicClient) VerifyIDToken(ctx context.Context, raw, expectedNonce string) (string, error) {
 	expectedNonce = strings.TrimSpace(expectedNonce)
 	if strings.TrimSpace(raw) == "" || expectedNonce == "" {
-		return "", oidcUnauthorized("ID token validation context is invalid", nil)
+		return "", oidcUnauthorized("ID_TOKEN_CONTEXT_INVALID", "ID token validation context is invalid", nil)
 	}
 	if _, _, err := c.configuration(ctx); err != nil {
-		return "", oidcUnauthorized("ID token provider discovery failed", err)
+		return "", oidcUnauthorized("ID_TOKEN_DISCOVERY_FAILED", "ID token provider discovery failed", err)
 	}
 	c.mu.Lock()
 	verifier := c.idTokenVerifier
 	c.mu.Unlock()
 	if verifier == nil {
-		return "", oidcUnauthorized("ID token verifier is unavailable", nil)
+		return "", oidcUnauthorized("ID_TOKEN_VERIFIER_UNAVAILABLE", "ID token verifier is unavailable", nil)
 	}
 	token, err := verifier.Verify(c.requestContext(ctx), raw)
 	if err != nil {
-		return "", oidcUnauthorized("ID token signature or registered claims are invalid", nil)
+		return "", oidcUnauthorized("ID_TOKEN_REGISTERED_CLAIMS_INVALID", "ID token signature or registered claims are invalid", nil)
 	}
 	if token.Subject == "" || token.Nonce != expectedNonce {
-		return "", oidcUnauthorized("ID token subject or nonce is invalid", nil)
+		return "", oidcUnauthorized("ID_TOKEN_SUBJECT_OR_NONCE_INVALID", "ID token subject or nonce is invalid", nil)
 	}
 	var claims map[string]any
 	if err := token.Claims(&claims); err != nil {
-		return "", oidcUnauthorized("ID token claims are invalid", nil)
+		return "", oidcUnauthorized("ID_TOKEN_CLAIMS_INVALID", "ID token claims are invalid", nil)
 	}
 	if _, ok := numericDateClaim(claims["nbf"]); !ok {
-		return "", oidcUnauthorized("ID token nbf is missing", nil)
+		return "", oidcUnauthorized("ID_TOKEN_NBF_MISSING", "ID token nbf is missing", nil)
 	}
 	return token.Subject, nil
 }

apps/api/internal/auth/oidc_test.go

@@ -91,20 +91,30 @@ func TestOIDCVerifierRejectsMissingOrMismatchedSecurityClaims(t *testing.T) {
 		RequiredScopes: []string{"gateway.access"}, HTTPClient: server.Client(),
 	})
 	tests := []struct {
-		name   string
-		mutate func(jwt.MapClaims)
+		name, wantCategory string
+		mutate             func(jwt.MapClaims)
 	}{
-		{"missing nbf", func(claims jwt.MapClaims) { delete(claims, "nbf") }},
-		{"wrong audience", func(claims jwt.MapClaims) { claims["aud"] = "other-api" }},
-		{"wrong tenant", func(claims jwt.MapClaims) { claims["tid"] = "tenant-2" }},
-		{"missing scope", func(claims jwt.MapClaims) { claims["scope"] = "openid" }},
-		{"unmapped role", func(claims jwt.MapClaims) { claims["roles"] = []string{"other.admin"} }},
+		{"missing nbf", "NBF_MISSING", func(claims jwt.MapClaims) { delete(claims, "nbf") }},
+		{"missing exp", "EXP_MISSING", func(claims jwt.MapClaims) { delete(claims, "exp") }},
+		{"missing issuer", "ISSUER_MISSING", func(claims jwt.MapClaims) { delete(claims, "iss") }},
+		{"missing audience", "AUDIENCE_MISSING", func(claims jwt.MapClaims) { delete(claims, "aud") }},
+		{"wrong audience", "AUDIENCE_INVALID", func(claims jwt.MapClaims) { claims["aud"] = "other-api" }},
+		{"wrong tenant", "STABLE_IDENTITY_CLAIMS_INVALID", func(claims jwt.MapClaims) { claims["tid"] = "tenant-2" }},
+		{"missing scope", "REQUIRED_SCOPE_MISSING", func(claims jwt.MapClaims) { claims["scope"] = "openid" }},
+		{"unmapped role", "MAPPED_ROLE_MISSING", func(claims jwt.MapClaims) { claims["roles"] = []string{"other.admin"} }},
 	}
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {
 			raw := signedOIDCToken(t, issuer, "ec-key", jwt.SigningMethodES256, key, test.mutate)
 			if _, err := verifier.Verify(context.Background(), raw); err == nil {
 				t.Fatal("expected token to be rejected")
+			} else {
+				if !errors.Is(err, ErrUnauthorized) {
+					t.Fatalf("validation error no longer wraps ErrUnauthorized: %v", err)
+				}
+				if category := OIDCValidationCategory(err); category != test.wantCategory {
+					t.Fatalf("validation category=%q, want %q", category, test.wantCategory)
+				}
 			}
 		})
 	}

apps/api/internal/httpapi/oidc_session.go

@@ -111,17 +111,17 @@ func (s *Server) completeOIDCLogin(w http.ResponseWriter, r *http.Request) {
 	}
 	tokens, err := runtime.PublicClient.ExchangeCode(r.Context(), r.URL.Query().Get("code"), transaction.PKCEVerifier)
 	if err != nil || tokens.AccessToken == "" || tokens.RefreshToken == "" || tokens.IDToken == "" {
-		s.writeOIDCCallbackError(w, r, http.StatusUnauthorized, "认证中心登录结果无效，请重新登录", errorCodeOIDCTokenExchangeFailed)
+		s.writeOIDCTokenFailure(w, r, "TOKEN_ENDPOINT_REJECTED", "TOKEN_RESPONSE_INVALID", "认证中心登录结果无效，请重新登录")
 		return
 	}
 	identity, err := runtime.Verifier.Verify(r.Context(), tokens.AccessToken)
 	if err != nil || identity == nil {
-		s.writeOIDCCallbackError(w, r, http.StatusUnauthorized, "认证中心访问令牌校验失败", errorCodeOIDCTokenExchangeFailed)
+		s.writeOIDCTokenFailure(w, r, "ACCESS_TOKEN_INVALID", auth.OIDCValidationCategory(err), "认证中心访问令牌校验失败")
 		return
 	}
 	idSubject, err := runtime.PublicClient.VerifyIDToken(r.Context(), tokens.IDToken, transaction.Nonce)
 	if err != nil || idSubject != identity.ID {
-		s.writeOIDCCallbackError(w, r, http.StatusUnauthorized, "认证中心身份令牌校验失败", errorCodeOIDCTokenExchangeFailed)
+		s.writeOIDCTokenFailure(w, r, "ID_TOKEN_INVALID", auth.OIDCValidationCategory(err), "认证中心身份令牌校验失败")
 		return
 	}
 	projection, err := s.resolveOIDCUserProjectionForRevision(r.Context(), r, identity, runtime.Revision)
@@ -253,6 +253,27 @@ func (s *Server) writeOIDCCallbackError(w http.ResponseWriter, r *http.Request,
 	s.writeOIDCCallbackErrorWithDiagnostics(w, r, status, message, code, "", "")
 }
 
+func (s *Server) writeOIDCTokenFailure(w http.ResponseWriter, r *http.Request, stage, validationCategory, message string) {
+	diagnosticID := newOIDCDiagnosticID()
+	if s.logger != nil {
+		s.logger.WarnContext(r.Context(), "OIDC token processing rejected",
+			"event", "oidc_token_processing_rejected",
+			"stage", stage,
+			"validationCategory", validationCategory,
+			"diagnosticId", diagnosticID,
+		)
+	}
+	s.writeOIDCCallbackErrorWithDiagnostics(
+		w,
+		r,
+		http.StatusUnauthorized,
+		message,
+		errorCodeOIDCTokenExchangeFailed,
+		"",
+		diagnosticID,
+	)
+}
+
 func (s *Server) writeOIDCLoginTransactionError(w http.ResponseWriter, r *http.Request, message, reason string) {
 	diagnosticID := newOIDCDiagnosticID()
 	if s.logger != nil {

apps/api/internal/httpapi/oidc_session_test.go

@@ -128,6 +128,51 @@ func TestCompleteOIDCLoginReportsSafeTransactionFailureReason(t *testing.T) {
 	}
 }
 
+func TestOIDCTokenFailureReportsOnlyCorrelatedSafeStage(t *testing.T) {
+	var logs bytes.Buffer
+	server := &Server{
+		identityTestRevision: identity.Revision{
+			ID: "diagnostic-revision", WebBaseURL: "http://localhost:5178",
+		},
+		logger: slog.New(slog.NewJSONHandler(&logs, nil)),
+	}
+	request := httptest.NewRequest(
+		http.MethodGet,
+		"/api/v1/auth/oidc/callback?code=sensitive-code-marker",
+		nil,
+	)
+	recorder := httptest.NewRecorder()
+
+	server.writeOIDCTokenFailure(
+		recorder,
+		request,
+		"ACCESS_TOKEN_INVALID",
+		"REQUIRED_SCOPE_MISSING",
+		"认证中心访问令牌校验失败",
+	)
+
+	if recorder.Code != http.StatusSeeOther {
+		t.Fatalf("callback status=%d, want 303", recorder.Code)
+	}
+	location, err := url.Parse(recorder.Header().Get("Location"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	diagnosticID := location.Query().Get("oidcDiagnosticId")
+	if location.Query().Get("oidcError") != errorCodeOIDCTokenExchangeFailed ||
+		location.Query().Get("oidcErrorReason") != "" ||
+		diagnosticID == "" {
+		t.Fatalf("unsafe callback diagnostic: %q", location.RawQuery)
+	}
+	if !strings.Contains(logs.String(), `"diagnosticId":"`+diagnosticID+`"`) ||
+		!strings.Contains(logs.String(), `"stage":"ACCESS_TOKEN_INVALID"`) ||
+		!strings.Contains(logs.String(), `"validationCategory":"REQUIRED_SCOPE_MISSING"`) ||
+		strings.Contains(logs.String(), "sensitive-code-marker") ||
+		strings.Contains(location.RawQuery, "sensitive-code-marker") {
+		t.Fatalf("OIDC token diagnostic was missing or leaked callback material")
+	}
+}
+
 func TestDeleteOIDCBrowserSessionIsIdempotentAndExpiresCookie(t *testing.T) {
 	sessions := &fakeOIDCSessions{}
 	server := &Server{oidcSessions: sessions, identityTestCookieSecure: true}