테넌트 접근 제한 로직 보강

backend/internal/handler/auth_handler.go

@@ -3944,6 +3944,70 @@ func (h *AuthHandler) GetMe(c *fiber.Ctx) error {
 	return c.JSON(profile)
 }
 
+func (h *AuthHandler) resolveProfileForSubject(ctx context.Context, subject string) (*domain.UserProfileResponse, error) {
+	subject = strings.TrimSpace(subject)
+	if subject == "" || h.KratosAdmin == nil {
+		return nil, fmt.Errorf("subject profile unavailable")
+	}
+
+	identity, err := h.KratosAdmin.GetIdentity(ctx, subject)
+	if err != nil {
+		return nil, err
+	}
+	if identity == nil {
+		return nil, fmt.Errorf("identity not found")
+	}
+
+	profile := h.mapKratosIdentityToProfile(identity.ID, identity.Traits)
+	if profile == nil {
+		return nil, fmt.Errorf("failed to map identity profile")
+	}
+	return h.hydrateResolvedProfile(ctx, profile), nil
+}
+
+func (h *AuthHandler) hydrateResolvedProfile(ctx context.Context, profile *domain.UserProfileResponse) *domain.UserProfileResponse {
+	if profile == nil {
+		return nil
+	}
+
+	profile.Role = domain.NormalizeRole(profile.Role)
+	if profile.Role == "" {
+		profile.Role = domain.RoleUser
+	}
+
+	if h.TenantService != nil {
+		if profile.Tenant == nil && profile.TenantID != nil && *profile.TenantID != "" {
+			if tenant, err := h.TenantService.GetTenant(ctx, *profile.TenantID); err == nil {
+				profile.Tenant = tenant
+			}
+		}
+		if profile.Tenant == nil && profile.CompanyCode != "" {
+			if tenant, err := h.TenantService.GetTenantBySlug(ctx, profile.CompanyCode); err == nil && tenant != nil {
+				profile.Tenant = tenant
+				if profile.TenantID == nil || *profile.TenantID == "" {
+					profile.TenantID = &tenant.ID
+				}
+			}
+		}
+	}
+
+	if h.TenantService != nil {
+		if profile.Role == domain.RoleTenantAdmin {
+			manageable, err := h.TenantService.ListManageableTenants(ctx, profile.ID)
+			if err == nil {
+				profile.ManageableTenants = manageable
+			}
+		}
+
+		joined, err := h.TenantService.ListJoinedTenants(ctx, profile.ID)
+		if err == nil {
+			profile.JoinedTenants = joined
+		}
+	}
+
+	return profile
+}
+
 // GetEnrichedProfile - Exported wrapper for resolveCurrentProfile used by middlewares
 func (h *AuthHandler) GetEnrichedProfile(c *fiber.Ctx) (*domain.UserProfileResponse, error) {
 	return h.resolveCurrentProfile(c)
@@ -5132,8 +5196,14 @@ func (h *AuthHandler) GetConsentRequest(c *fiber.Ctx) error {
 	)
 
 	profile, err := h.resolveCurrentProfile(c)
-	if tenantErr := enforceClientTenantAccess(c, consentRequest.Client, profile, err); tenantErr != nil {
-		return tenantErr
+	if (err != nil || profile == nil) && consentRequest.Subject != "" {
+		if fallbackProfile, fallbackErr := h.resolveProfileForSubject(c.Context(), consentRequest.Subject); fallbackErr == nil {
+			profile = fallbackProfile
+			err = nil
+		}
+	}
+	if enforceClientTenantAccess(c, h.TenantService, consentRequest.Client, profile, err) {
+		return nil
 	}
 
 	// [New] 로컬 DB에서 기존 동의 내역 확인 (강제 자동 승인 전략)
@@ -5342,8 +5412,14 @@ func (h *AuthHandler) AcceptConsentRequest(c *fiber.Ctx) error {
 	consentRequest.RequestedScope = mergeRequestedScopesWithClientRequirements(consentRequest.Client, consentRequest.RequestedScope)
 
 	profile, err := h.resolveCurrentProfile(c)
-	if tenantErr := enforceClientTenantAccess(c, consentRequest.Client, profile, err); tenantErr != nil {
-		return tenantErr
+	if (err != nil || profile == nil) && consentRequest.Subject != "" {
+		if fallbackProfile, fallbackErr := h.resolveProfileForSubject(c.Context(), consentRequest.Subject); fallbackErr == nil {
+			profile = fallbackProfile
+			err = nil
+		}
+	}
+	if enforceClientTenantAccess(c, h.TenantService, consentRequest.Client, profile, err) {
+		return nil
 	}
 
 	// 3. Hydra에 승인 요청
@@ -5484,9 +5560,15 @@ func (h *AuthHandler) AcceptOidcLoginRequest(c *fiber.Ctx) error {
 	}
 
 	profile, err := h.resolveCurrentProfile(c)
+	if (err != nil || profile == nil) && loginReq != nil && strings.TrimSpace(loginReq.Subject) != "" {
+		if fallbackProfile, fallbackErr := h.resolveProfileForSubject(c.Context(), loginReq.Subject); fallbackErr == nil {
+			profile = fallbackProfile
+			err = nil
+		}
+	}
 	if loginReq != nil {
-		if tenantErr := enforceClientTenantAccess(c, loginReq.Client, profile, err); tenantErr != nil {
-			return tenantErr
+		if enforceClientTenantAccess(c, h.TenantService, loginReq.Client, profile, err) {
+			return nil
 		}
 	}
 
@@ -5631,37 +5713,7 @@ func (h *AuthHandler) resolveCurrentProfile(c *fiber.Ctx) (*domain.UserProfileRe
 		delete(profile.Metadata, "_used_identifier") // Cleanup
 	}
 
-	// Fetch Tenant Metadata if missing
-	if h.TenantService != nil {
-		if profile.Tenant == nil && profile.TenantID != nil && *profile.TenantID != "" {
-			if tenant, err := h.TenantService.GetTenant(c.Context(), *profile.TenantID); err == nil {
-				profile.Tenant = tenant
-			}
-		}
-		if profile.Tenant == nil && profile.CompanyCode != "" {
-			if tenant, err := h.TenantService.GetTenantBySlug(c.Context(), profile.CompanyCode); err == nil && tenant != nil {
-				profile.Tenant = tenant
-				if profile.TenantID == nil || *profile.TenantID == "" {
-					profile.TenantID = &tenant.ID
-				}
-			}
-		}
-	}
-
-	// [New] Fetch manageable and joined tenants
-	if h.TenantService != nil {
-		if profile.Role == domain.RoleTenantAdmin {
-			manageable, err := h.TenantService.ListManageableTenants(c.Context(), profile.ID)
-			if err == nil {
-				profile.ManageableTenants = manageable
-			}
-		}
-
-		joined, err := h.TenantService.ListJoinedTenants(c.Context(), profile.ID)
-		if err == nil {
-			profile.JoinedTenants = joined
-		}
-	}
+	profile = h.hydrateResolvedProfile(c.Context(), profile)
 
 	// 4. Save to Redis Cache (Short TTL)
 	// IMPORTANT: In dev mode, if role was overridden, we should NOT cache it under the token key

backend/internal/handler/client_tenant_access.go

@@ -2,6 +2,8 @@ package handler
 
 import (
 	"baron-sso-backend/internal/domain"
+	"baron-sso-backend/internal/response"
+	"baron-sso-backend/internal/service"
 	"encoding/json"
 	"errors"
 	"sort"
@@ -133,8 +135,32 @@ func clientTenantAccessAllowed(profile *domain.UserProfileResponse, client domai
 	return false
 }
 
-func tenantNotAllowedError(c *fiber.Ctx) error {
-	return errorJSONCode(c, fiber.StatusForbidden, "tenant_not_allowed", "허용되지 않은 테넌트입니다.")
+type tenantAccessDeniedDetails struct {
+	Account           tenantAccessDeniedAccount  `json:"account"`
+	CurrentTenant     tenantAccessDeniedTenant   `json:"current_tenant"`
+	AffiliatedTenants []tenantAccessDeniedTenant `json:"affiliated_tenants,omitempty"`
+	AllowedTenants    []tenantAccessDeniedTenant `json:"allowed_tenants,omitempty"`
+}
+
+type tenantAccessDeniedAccount struct {
+	Email string `json:"email,omitempty"`
+}
+
+type tenantAccessDeniedTenant struct {
+	ID         string `json:"id,omitempty"`
+	Slug       string `json:"slug,omitempty"`
+	Name       string `json:"name,omitempty"`
+	Identifier string `json:"identifier,omitempty"`
+}
+
+func tenantNotAllowedError(c *fiber.Ctx, details tenantAccessDeniedDetails) error {
+	return response.ErrorWithDetails(
+		c,
+		fiber.StatusForbidden,
+		"tenant_not_allowed",
+		"허용되지 않은 테넌트입니다.",
+		details,
+	)
 }
 
 func isClientTenantAccessAllowed(profile *domain.UserProfileResponse, client domain.HydraClient) bool {
@@ -144,17 +170,162 @@ func isClientTenantAccessAllowed(profile *domain.UserProfileResponse, client dom
 	return clientTenantAccessAllowed(profile, client)
 }
 
-func enforceClientTenantAccess(c *fiber.Ctx, client domain.HydraClient, profile *domain.UserProfileResponse, resolveErr error) error {
+func enforceClientTenantAccess(c *fiber.Ctx, tenantSvc service.TenantService, client domain.HydraClient, profile *domain.UserProfileResponse, resolveErr error) bool {
 	if !clientTenantAccessRestricted(client.Metadata) {
-		return nil
+		return false
 	}
+	details := buildTenantAccessDeniedDetails(c, tenantSvc, client, profile)
 	if resolveErr != nil || profile == nil {
-		return tenantNotAllowedError(c)
+		_ = tenantNotAllowedError(c, details)
+		return true
 	}
 	if !clientTenantAccessAllowed(profile, client) {
-		return tenantNotAllowedError(c)
+		_ = tenantNotAllowedError(c, details)
+		return true
 	}
-	return nil
+	return false
+}
+
+func buildTenantAccessDeniedDetails(c *fiber.Ctx, tenantSvc service.TenantService, client domain.HydraClient, profile *domain.UserProfileResponse) tenantAccessDeniedDetails {
+	details := tenantAccessDeniedDetails{
+		Account:           tenantAccessDeniedAccount{Email: strings.TrimSpace(profileEmail(profile))},
+		CurrentTenant:     resolveCurrentTenantDetails(c, tenantSvc, profile),
+		AffiliatedTenants: resolveAffiliatedTenantDetails(c, tenantSvc, profile),
+	}
+
+	for _, identifier := range clientAllowedTenants(client.Metadata) {
+		details.AllowedTenants = append(details.AllowedTenants, resolveAllowedTenantDetails(c, tenantSvc, identifier))
+	}
+
+	return details
+}
+
+func resolveAffiliatedTenantDetails(c *fiber.Ctx, tenantSvc service.TenantService, profile *domain.UserProfileResponse) []tenantAccessDeniedTenant {
+	if profile == nil {
+		return nil
+	}
+
+	seen := make(map[string]struct{})
+	out := make([]tenantAccessDeniedTenant, 0, len(profile.JoinedTenants)+1)
+	appendTenant := func(tenant tenantAccessDeniedTenant) {
+		key := strings.ToLower(firstNonEmptyString(tenant.ID, tenant.Slug, tenant.Identifier, tenant.Name))
+		if key == "" {
+			return
+		}
+		if _, ok := seen[key]; ok {
+			return
+		}
+		seen[key] = struct{}{}
+		out = append(out, tenant)
+	}
+
+	appendTenant(resolveCurrentTenantDetails(c, tenantSvc, profile))
+
+	for _, joined := range profile.JoinedTenants {
+		appendTenant(tenantAccessDeniedTenant{
+			ID:         strings.TrimSpace(joined.ID),
+			Slug:       strings.TrimSpace(joined.Slug),
+			Name:       strings.TrimSpace(joined.Name),
+			Identifier: firstNonEmptyString(strings.TrimSpace(joined.Slug), strings.TrimSpace(joined.ID)),
+		})
+	}
+
+	return out
+}
+
+func resolveCurrentTenantDetails(c *fiber.Ctx, tenantSvc service.TenantService, profile *domain.UserProfileResponse) tenantAccessDeniedTenant {
+	if profile == nil {
+		return tenantAccessDeniedTenant{}
+	}
+
+	if profile.Tenant != nil {
+		return tenantAccessDeniedTenant{
+			ID:         strings.TrimSpace(profile.Tenant.ID),
+			Slug:       strings.TrimSpace(profile.Tenant.Slug),
+			Name:       strings.TrimSpace(profile.Tenant.Name),
+			Identifier: firstNonEmptyString(strings.TrimSpace(profile.Tenant.Slug), strings.TrimSpace(profile.Tenant.ID)),
+		}
+	}
+
+	if tenantSvc != nil {
+		if profile.TenantID != nil && strings.TrimSpace(*profile.TenantID) != "" {
+			if tenant, err := tenantSvc.GetTenant(c.Context(), strings.TrimSpace(*profile.TenantID)); err == nil && tenant != nil {
+				return tenantAccessDeniedTenant{
+					ID:         strings.TrimSpace(tenant.ID),
+					Slug:       strings.TrimSpace(tenant.Slug),
+					Name:       strings.TrimSpace(tenant.Name),
+					Identifier: firstNonEmptyString(strings.TrimSpace(tenant.Slug), strings.TrimSpace(tenant.ID)),
+				}
+			}
+		}
+		if strings.TrimSpace(profile.CompanyCode) != "" {
+			if tenant, err := tenantSvc.GetTenantBySlug(c.Context(), strings.TrimSpace(profile.CompanyCode)); err == nil && tenant != nil {
+				return tenantAccessDeniedTenant{
+					ID:         strings.TrimSpace(tenant.ID),
+					Slug:       strings.TrimSpace(tenant.Slug),
+					Name:       strings.TrimSpace(tenant.Name),
+					Identifier: firstNonEmptyString(strings.TrimSpace(tenant.Slug), strings.TrimSpace(tenant.ID)),
+				}
+			}
+		}
+	}
+
+	return tenantAccessDeniedTenant{
+		ID:         strings.TrimSpace(pointerValue(profile.TenantID)),
+		Slug:       strings.TrimSpace(profile.CompanyCode),
+		Identifier: firstNonEmptyString(strings.TrimSpace(profile.CompanyCode), strings.TrimSpace(pointerValue(profile.TenantID))),
+	}
+}
+
+func resolveAllowedTenantDetails(c *fiber.Ctx, tenantSvc service.TenantService, identifier string) tenantAccessDeniedTenant {
+	identifier = strings.TrimSpace(identifier)
+	if identifier == "" {
+		return tenantAccessDeniedTenant{}
+	}
+
+	if tenantSvc != nil {
+		if tenant, err := tenantSvc.GetTenant(c.Context(), identifier); err == nil && tenant != nil {
+			return tenantAccessDeniedTenant{
+				ID:         strings.TrimSpace(tenant.ID),
+				Slug:       strings.TrimSpace(tenant.Slug),
+				Name:       strings.TrimSpace(tenant.Name),
+				Identifier: firstNonEmptyString(strings.TrimSpace(tenant.Slug), strings.TrimSpace(tenant.ID), identifier),
+			}
+		}
+		if tenant, err := tenantSvc.GetTenantBySlug(c.Context(), identifier); err == nil && tenant != nil {
+			return tenantAccessDeniedTenant{
+				ID:         strings.TrimSpace(tenant.ID),
+				Slug:       strings.TrimSpace(tenant.Slug),
+				Name:       strings.TrimSpace(tenant.Name),
+				Identifier: firstNonEmptyString(strings.TrimSpace(tenant.Slug), strings.TrimSpace(tenant.ID), identifier),
+			}
+		}
+	}
+
+	return tenantAccessDeniedTenant{Identifier: identifier}
+}
+
+func profileEmail(profile *domain.UserProfileResponse) string {
+	if profile == nil {
+		return ""
+	}
+	return profile.Email
+}
+
+func pointerValue(value *string) string {
+	if value == nil {
+		return ""
+	}
+	return *value
+}
+
+func firstNonEmptyString(values ...string) string {
+	for _, value := range values {
+		if strings.TrimSpace(value) != "" {
+			return strings.TrimSpace(value)
+		}
+	}
+	return ""
 }
 
 type clientStructuredScope struct {

backend/internal/handler/client_tenant_access_test.go

@@ -12,6 +12,7 @@ import (
 
 	"github.com/gofiber/fiber/v2"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/mock"
 )
 
 func TestCreateClient_NormalizesTenantAccessMetadata(t *testing.T) {
@@ -190,6 +191,18 @@ func TestGetConsentRequest_DeniesTenantAccess(t *testing.T) {
 	resp, err := app.Test(req)
 	assert.NoError(t, err)
 	assert.Equal(t, http.StatusForbidden, resp.StatusCode)
+
+	var body map[string]any
+	assert.NoError(t, json.NewDecoder(resp.Body).Decode(&body))
+	assert.Equal(t, "tenant_not_allowed", body["code"])
+	details, ok := body["details"].(map[string]any)
+	assert.True(t, ok)
+	account, ok := details["account"].(map[string]any)
+	assert.True(t, ok)
+	assert.NotEmpty(t, account["email"])
+	currentTenant, ok := details["current_tenant"].(map[string]any)
+	assert.True(t, ok)
+	assert.NotEmpty(t, currentTenant["identifier"])
 }
 
 func TestGetConsentRequest_DeniesRestrictedClientWhenProfileResolutionFails(t *testing.T) {
@@ -232,6 +245,37 @@ func TestGetConsentRequest_DeniesRestrictedClientWhenProfileResolutionFails(t *t
 			AdminURL:   "http://hydra.test",
 			HTTPClient: client,
 		},
+		KratosAdmin: func() service.KratosAdminService {
+			mockKratos := new(MockKratosAdminService)
+			mockKratos.On("GetIdentity", mock.Anything, "user-123").Return(&service.KratosIdentity{
+				ID: "user-123",
+				Traits: map[string]interface{}{
+					"email":       "user@test.com",
+					"tenant_id":   "tenant-a",
+					"companyCode": "tenant-a",
+				},
+			}, nil).Once()
+			return mockKratos
+		}(),
+		TenantService: func() service.TenantService {
+			tenantSvc := new(MockTenantService)
+			tenantSvc.On("GetTenant", mock.Anything, "tenant-a").Return(&domain.Tenant{
+				ID:   "tenant-a",
+				Slug: "tenant-a",
+				Name: "Tenant A",
+			}, nil).Twice()
+			tenantSvc.On("ListJoinedTenants", mock.Anything, "user-123").Return([]domain.Tenant{
+				{ID: "tenant-a", Slug: "tenant-a", Name: "Tenant A"},
+				{ID: "tenant-c", Slug: "tenant-c", Name: "Tenant C"},
+			}, nil).Once()
+			tenantSvc.On("GetTenant", mock.Anything, "tenant-b").Return(nil, assert.AnError).Once()
+			tenantSvc.On("GetTenantBySlug", mock.Anything, "tenant-b").Return(&domain.Tenant{
+				ID:   "tenant-b-id",
+				Slug: "tenant-b",
+				Name: "Tenant B",
+			}, nil).Once()
+			return tenantSvc
+		}(),
 		ConsentRepo: &mockConsentRepo{
 			consents: []domain.ClientConsent{
 				{
@@ -253,6 +297,22 @@ func TestGetConsentRequest_DeniesRestrictedClientWhenProfileResolutionFails(t *t
 	assert.NoError(t, err)
 	assert.Equal(t, http.StatusForbidden, resp.StatusCode)
 	assert.False(t, acceptCalled)
+
+	var body map[string]any
+	assert.NoError(t, json.NewDecoder(resp.Body).Decode(&body))
+	assert.Equal(t, "tenant_not_allowed", body["code"])
+
+	details, ok := body["details"].(map[string]any)
+	assert.True(t, ok)
+	account, ok := details["account"].(map[string]any)
+	assert.True(t, ok)
+	assert.Equal(t, "user@test.com", account["email"])
+	currentTenant, ok := details["current_tenant"].(map[string]any)
+	assert.True(t, ok)
+	assert.Equal(t, "Tenant A", currentTenant["name"])
+	affiliatedTenants, ok := details["affiliated_tenants"].([]any)
+	assert.True(t, ok)
+	assert.Len(t, affiliatedTenants, 2)
 }
 
 func TestAcceptOidcLoginRequest_DeniesTenantAccess(t *testing.T) {
@@ -260,9 +320,15 @@ func TestAcceptOidcLoginRequest_DeniesTenantAccess(t *testing.T) {
 	app.Get("/deny", func(c *fiber.Ctx) error {
 		tenantID := "tenant-a"
 		profile := &domain.UserProfileResponse{
-			ID:       "user-123",
-			Role:     domain.RoleUser,
-			TenantID: &tenantID,
+			ID:          "user-123",
+			Role:        domain.RoleUser,
+			Email:       "user@test.com",
+			TenantID:    &tenantID,
+			CompanyCode: "tenant-a",
+			JoinedTenants: []domain.Tenant{
+				{ID: "tenant-a", Slug: "tenant-a", Name: "Tenant A"},
+				{ID: "tenant-c", Slug: "tenant-c", Name: "Tenant C"},
+			},
 		}
 		client := domain.HydraClient{
 			ClientID: "client-tenant",
@@ -271,11 +337,49 @@ func TestAcceptOidcLoginRequest_DeniesTenantAccess(t *testing.T) {
 				"allowed_tenants":          []string{"tenant-b"},
 			},
 		}
-		return enforceClientTenantAccess(c, client, profile, nil)
+		tenantSvc := new(MockTenantService)
+		tenantSvc.On("GetTenant", mock.Anything, "tenant-a").Return(&domain.Tenant{
+			ID:   "tenant-a",
+			Slug: "tenant-a",
+			Name: "Tenant A",
+		}, nil).Twice()
+		tenantSvc.On("GetTenant", mock.Anything, "tenant-b").Return(nil, assert.AnError).Once()
+		tenantSvc.On("GetTenantBySlug", mock.Anything, "tenant-b").Return(&domain.Tenant{
+			ID:   "tenant-b-id",
+			Slug: "tenant-b",
+			Name: "Tenant B",
+		}, nil).Once()
+		enforceClientTenantAccess(c, tenantSvc, client, profile, nil)
+		return nil
 	})
 
 	req := httptest.NewRequest(http.MethodGet, "/deny", nil)
 	resp, err := app.Test(req)
 	assert.NoError(t, err)
 	assert.Equal(t, http.StatusForbidden, resp.StatusCode)
+
+	var body map[string]any
+	assert.NoError(t, json.NewDecoder(resp.Body).Decode(&body))
+	assert.Equal(t, "tenant_not_allowed", body["code"])
+
+	details, ok := body["details"].(map[string]any)
+	assert.True(t, ok)
+
+	account, ok := details["account"].(map[string]any)
+	assert.True(t, ok)
+	assert.Equal(t, "user@test.com", account["email"])
+
+	currentTenant, ok := details["current_tenant"].(map[string]any)
+	assert.True(t, ok)
+	assert.Equal(t, "Tenant A", currentTenant["name"])
+	affiliatedTenants, ok := details["affiliated_tenants"].([]any)
+	assert.True(t, ok)
+	assert.Len(t, affiliatedTenants, 2)
+
+	allowedTenants, ok := details["allowed_tenants"].([]any)
+	assert.True(t, ok)
+	assert.Len(t, allowedTenants, 1)
+	allowedTenant, ok := allowedTenants[0].(map[string]any)
+	assert.True(t, ok)
+	assert.Equal(t, "Tenant B", allowedTenant["name"])
 }