feat(containers): enforce disable bind mounts (#4110)

* feat(containers): enforce disable bind mounts

* refactor(docker): move check for endpoint admin to a function

* feat(docker): check if service has bind mounts

* feat(services): allow bind mounts for endpoint admin

* feat(container): enable bind mounts for endpoint admin

* fix(services): fix typo

api/http/proxy/factory/docker/containers.go

@@ -9,8 +9,7 @@ import (
 	"net/http"
 
 	"github.com/docker/docker/client"
-	portainer "github.com/portainer/portainer/api"
-	bolterrors "github.com/portainer/portainer/api/bolt/errors"
+	"github.com/portainer/portainer/api"
 	"github.com/portainer/portainer/api/http/proxy/factory/responseutils"
 	"github.com/portainer/portainer/api/http/security"
 	"github.com/portainer/portainer/api/internal/authorization"
@@ -163,6 +162,7 @@ func (transport *Transport) decorateContainerCreationOperation(request *http.Req
 			Devices    []interface{} `json:"Devices"`
 			CapAdd     []string      `json:"CapAdd"`
 			CapDrop    []string      `json:"CapDrop"`
+			Binds      []string      `json:"Binds"`
 		} `json:"HostConfig"`
 	}
 
@@ -175,25 +175,12 @@ func (transport *Transport) decorateContainerCreationOperation(request *http.Req
 		return nil, err
 	}
 
-	user, err := transport.dataStore.User().User(tokenData.ID)
+	isAdminOrEndpointAdmin, err := transport.isAdminOrEndpointAdmin(request)
 	if err != nil {
 		return nil, err
 	}
 
-	rbacExtension, err := transport.dataStore.Extension().Extension(portainer.RBACExtension)
-	if err != nil && err != bolterrors.ErrObjectNotFound {
-		return nil, err
-	}
-
-	endpointResourceAccess := false
-	_, ok := user.EndpointAuthorizations[portainer.EndpointID(transport.endpoint.ID)][portainer.EndpointResourcesAccess]
-	if ok {
-		endpointResourceAccess = true
-	}
-
-	isAdmin := (rbacExtension != nil && endpointResourceAccess) || tokenData.Role == portainer.AdministratorRole
-
-	if !isAdmin {
+	if !isAdminOrEndpointAdmin {
 		settings, err := transport.dataStore.Settings().Settings()
 		if err != nil {
 			return nil, err
@@ -219,13 +206,17 @@ func (transport *Transport) decorateContainerCreationOperation(request *http.Req
 		}
 
 		if !settings.AllowDeviceMappingForRegularUsers && len(partialContainer.HostConfig.Devices) > 0 {
-			return nil, errors.New("forbidden to use device mapping")
+			return forbiddenResponse, errors.New("forbidden to use device mapping")
 		}
 
 		if !settings.AllowContainerCapabilitiesForRegularUsers && (len(partialContainer.HostConfig.CapAdd) > 0 || len(partialContainer.HostConfig.CapDrop) > 0) {
 			return nil, errors.New("forbidden to use container capabilities")
 		}
 
+		if !settings.AllowBindMountsForRegularUsers && (len(partialContainer.HostConfig.Binds) > 0) {
+			return forbiddenResponse, errors.New("forbidden to use bind mounts")
+		}
+
 		request.Body = ioutil.NopCloser(bytes.NewBuffer(body))
 	}
 

api/http/proxy/factory/docker/services.go

@@ -1,7 +1,11 @@
 package docker
 
 import (
+	"bytes"
 	"context"
+	"encoding/json"
+	"errors"
+	"io/ioutil"
 	"net/http"
 
 	"github.com/docker/docker/api/types"
@@ -85,3 +89,54 @@ func selectorServiceLabels(responseObject map[string]interface{}) map[string]int
 	}
 	return nil
 }
+
+func (transport *Transport) decorateServiceCreationOperation(request *http.Request) (*http.Response, error) {
+	type PartialService struct {
+		TaskTemplate struct {
+			ContainerSpec struct {
+				Mounts []struct {
+					Type string
+				}
+			}
+		}
+	}
+
+	forbiddenResponse := &http.Response{
+		StatusCode: http.StatusForbidden,
+	}
+
+	isAdminOrEndpointAdmin, err := transport.isAdminOrEndpointAdmin(request)
+	if err != nil {
+		return nil, err
+	}
+
+	if !isAdminOrEndpointAdmin {
+		settings, err := transport.dataStore.Settings().Settings()
+		if err != nil {
+			return nil, err
+		}
+
+		body, err := ioutil.ReadAll(request.Body)
+		if err != nil {
+			return nil, err
+		}
+
+		partialService := &PartialService{}
+		err = json.Unmarshal(body, partialService)
+		if err != nil {
+			return nil, err
+		}
+
+		if !settings.AllowBindMountsForRegularUsers && (len(partialService.TaskTemplate.ContainerSpec.Mounts) > 0) {
+			for _, mount := range partialService.TaskTemplate.ContainerSpec.Mounts {
+				if mount.Type == "bind" {
+					return forbiddenResponse, errors.New("forbidden to use bind mounts")
+				}
+			}
+		}
+
+		request.Body = ioutil.NopCloser(bytes.NewBuffer(body))
+	}
+
+	return transport.replaceRegistryAuthenticationHeader(request)
+}

api/http/proxy/factory/docker/transport.go

@@ -225,7 +225,7 @@ func (transport *Transport) proxyContainerRequest(request *http.Request) (*http.
 func (transport *Transport) proxyServiceRequest(request *http.Request) (*http.Response, error) {
 	switch requestPath := request.URL.Path; requestPath {
 	case "/services/create":
-		return transport.replaceRegistryAuthenticationHeader(request)
+		return transport.decorateServiceCreationOperation(request)
 
 	case "/services":
 		return transport.rewriteOperation(request, transport.serviceListOperation)
@@ -629,7 +629,6 @@ func (transport *Transport) createRegistryAccessContext(request *http.Request) (
 		return nil, err
 	}
 
-
 	accessContext := &registryAccessContext{
 		isAdmin: true,
 		userID:  tokenData.ID,
@@ -707,3 +706,32 @@ func (transport *Transport) createOperationContext(request *http.Request) (*rest
 
 	return operationContext, nil
 }
+
+func (transport *Transport) isAdminOrEndpointAdmin(request *http.Request) (bool, error) {
+	tokenData, err := security.RetrieveTokenData(request)
+	if err != nil {
+		return false, err
+	}
+
+	if tokenData.Role == portainer.AdministratorRole {
+		return true, nil
+	}
+
+	user, err := transport.dataStore.User().User(tokenData.ID)
+	if err != nil {
+		return false, err
+	}
+
+	rbacExtension, err := transport.dataStore.Extension().Extension(portainer.RBACExtension)
+	if err != nil && err != bolterrors.ErrObjectNotFound {
+		return false, err
+	}
+
+	if rbacExtension == nil {
+		return false, nil
+	}
+
+	_, endpointResourceAccess := user.EndpointAuthorizations[portainer.EndpointID(transport.endpoint.ID)][portainer.EndpointResourcesAccess]
+
+	return endpointResourceAccess, nil
+}