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[gvfs/wip/oholy/readonly-lockdown: 4/6] daemon: Handle lockdown option to disable writing

commit e782512ba06374bdc45998a9b7908f5b3c500393
Author: Ondrej Holy <oholy redhat com>
Date:   Tue May 14 09:31:37 2019 +0200

    daemon: Handle lockdown option to disable writing
    
    Handle the new mount-removable-storage-devices-as-read-only option of
    org.gnome.desktop.lockdown schema and present AFC, MTP, GPhoto2 devices
    as read-only if enabled.

 daemon/gvfsbackend.c           | 62 ++++++++++++++++++++++++++++++++++++++++--
 daemon/gvfsbackend.h           |  6 ++++
 daemon/gvfsbackendafc.c        |  2 ++
 daemon/gvfsbackendgphoto2.c    |  1 +
 daemon/gvfsbackendmtp.c        |  1 +
 daemon/gvfsjobcopy.c           |  7 +++++
 daemon/gvfsjobdelete.c         |  7 +++++
 daemon/gvfsjobmakedirectory.c  |  7 +++++
 daemon/gvfsjobmakesymlink.c    |  7 +++++
 daemon/gvfsjobmove.c           |  7 +++++
 daemon/gvfsjobopenforwrite.c   |  7 +++++
 daemon/gvfsjobpush.c           |  7 +++++
 daemon/gvfsjobqueryfsinfo.c    | 11 ++------
 daemon/gvfsjobsetattribute.c   |  7 +++++
 daemon/gvfsjobsetdisplayname.c |  7 +++++
 daemon/gvfsjobtrash.c          |  7 +++++
 16 files changed, 143 insertions(+), 10 deletions(-)
---
diff --git a/daemon/gvfsbackend.c b/daemon/gvfsbackend.c
index 4fd3455c..599733ef 100644
--- a/daemon/gvfsbackend.c
+++ b/daemon/gvfsbackend.c
@@ -80,6 +80,9 @@ struct _GVfsBackendPrivate
   char *default_location;
   GMountSpec *mount_spec;
   gboolean block_requests;
+
+  GSettings *lockdown_settings;
+  gboolean readonly_lockdown;
 };
 
 
@@ -155,7 +158,9 @@ g_vfs_backend_finalize (GObject *object)
   g_free (backend->priv->default_location);
   if (backend->priv->mount_spec)
     g_mount_spec_unref (backend->priv->mount_spec);
-  
+
+  g_clear_object (&backend->priv->lockdown_settings);
+
   if (G_OBJECT_CLASS (g_vfs_backend_parent_class)->finalize)
     (*G_OBJECT_CLASS (g_vfs_backend_parent_class)->finalize) (object);
 }
@@ -587,7 +592,29 @@ g_vfs_backend_add_auto_info (GVfsBackend *backend,
        g_file_attribute_matcher_matches (matcher,
                                          G_FILE_ATTRIBUTE_THUMBNAILING_FAILED)))
     get_thumbnail_attributes (uri, info);
-  
+
+  if (backend->priv->readonly_lockdown)
+    {
+      g_file_info_set_attribute_boolean (info, G_FILE_ATTRIBUTE_ACCESS_CAN_DELETE, FALSE);
+      g_file_info_set_attribute_boolean (info, G_FILE_ATTRIBUTE_ACCESS_CAN_RENAME, FALSE);
+      g_file_info_set_attribute_boolean (info, G_FILE_ATTRIBUTE_ACCESS_CAN_TRASH, FALSE);
+      g_file_info_set_attribute_boolean (info, G_FILE_ATTRIBUTE_ACCESS_CAN_WRITE, FALSE);
+    }
+}
+
+void
+g_vfs_backend_add_auto_fs_info (GVfsBackend *backend,
+                                GFileAttributeMatcher *matcher,
+                                GFileInfo *info)
+{
+  const char *type;
+
+  type = g_vfs_backend_get_backend_type (backend);
+  if (type)
+    g_file_info_set_attribute_string (info, G_FILE_ATTRIBUTE_GVFS_BACKEND, type);
+
+  if (backend->priv->readonly_lockdown)
+    g_file_info_set_attribute_boolean (info, G_FILE_ATTRIBUTE_FILESYSTEM_READONLY, TRUE);
 }
 
 void
@@ -1047,3 +1074,34 @@ g_vfs_backend_force_unmount (GVfsBackend *backend)
                                   (GAsyncReadyCallback) forced_unregister_mount_callback,
                                   NULL);
 }
+
+static void
+lockdown_settings_changed (GSettings *settings,
+                           gchar     *key,
+                           gpointer   user_data)
+{
+  GVfsBackend *backend = G_VFS_BACKEND (user_data);
+
+  backend->priv->readonly_lockdown = g_settings_get_boolean (settings,
+                                                             "mount-removable-storage-devices-as-read-only");
+}
+
+
+void
+g_vfs_backend_handle_readonly_lockdown (GVfsBackend *backend)
+{
+  backend->priv->lockdown_settings = g_settings_new ("org.gnome.desktop.lockdown");
+  backend->priv->readonly_lockdown = g_settings_get_boolean (backend->priv->lockdown_settings,
+                                                             "mount-removable-storage-devices-as-read-only");
+  g_signal_connect_object (backend->priv->lockdown_settings,
+                           "changed",
+                           G_CALLBACK (lockdown_settings_changed),
+                           backend,
+                           0);
+}
+
+gboolean
+g_vfs_backend_get_readonly_lockdown (GVfsBackend *backend)
+{
+  return backend->priv->readonly_lockdown;
+}
diff --git a/daemon/gvfsbackend.h b/daemon/gvfsbackend.h
index 9c7476cf..431dd290 100644
--- a/daemon/gvfsbackend.h
+++ b/daemon/gvfsbackend.h
@@ -516,6 +516,9 @@ void        g_vfs_backend_add_auto_info                  (GVfsBackend
                                                          GFileAttributeMatcher *matcher,
                                                          GFileInfo             *info,
                                                          const char            *uri);
+void        g_vfs_backend_add_auto_fs_info               (GVfsBackend           *backend,
+                                                          GFileAttributeMatcher *matcher,
+                                                          GFileInfo             *info);
 
 void        g_vfs_backend_set_block_requests             (GVfsBackend           *backend,
                                                           gboolean               value);
@@ -534,6 +537,9 @@ gboolean    g_vfs_backend_invocation_first_handler       (GVfsDBusMount *object,
                                                           GDBusMethodInvocation *invocation,
                                                           GVfsBackend *backend);
 
+void        g_vfs_backend_handle_readonly_lockdown       (GVfsBackend *backend);
+gboolean    g_vfs_backend_get_readonly_lockdown          (GVfsBackend *backend);
+
 G_END_DECLS
 
 #endif /* __G_VFS_BACKEND_H__ */
diff --git a/daemon/gvfsbackendafc.c b/daemon/gvfsbackendafc.c
index b6e6a106..ce68aa45 100644
--- a/daemon/gvfsbackendafc.c
+++ b/daemon/gvfsbackendafc.c
@@ -2760,6 +2760,8 @@ g_vfs_backend_afc_init (GVfsBackendAfc *self)
     }
 
   g_mutex_init (&self->apps_lock);
+
+  g_vfs_backend_handle_readonly_lockdown (G_VFS_BACKEND (self));
 }
 
 static void
diff --git a/daemon/gvfsbackendgphoto2.c b/daemon/gvfsbackendgphoto2.c
index 51e9a3bd..7e50194a 100644
--- a/daemon/gvfsbackendgphoto2.c
+++ b/daemon/gvfsbackendgphoto2.c
@@ -614,6 +614,7 @@ g_vfs_backend_gphoto2_init (GVfsBackendGphoto2 *gphoto2_backend)
   g_mutex_init (&gphoto2_backend->lock);
 
   g_vfs_backend_set_display_name (backend, "gphoto2");
+  g_vfs_backend_handle_readonly_lockdown (G_VFS_BACKEND (backend));
 
   mount_spec = g_mount_spec_new ("gphoto2");
   g_vfs_backend_set_mount_spec (backend, mount_spec);
diff --git a/daemon/gvfsbackendmtp.c b/daemon/gvfsbackendmtp.c
index e3a25ef2..c4f1e855 100644
--- a/daemon/gvfsbackendmtp.c
+++ b/daemon/gvfsbackendmtp.c
@@ -379,6 +379,7 @@ g_vfs_backend_mtp_init (GVfsBackendMtp *backend)
   g_mutex_init (&backend->mutex);
   g_vfs_backend_set_display_name (G_VFS_BACKEND (backend), "mtp");
   g_vfs_backend_set_icon_name (G_VFS_BACKEND (backend), "multimedia-player");
+  g_vfs_backend_handle_readonly_lockdown (G_VFS_BACKEND (backend));
 
   mount_spec = g_mount_spec_new ("mtp");
   g_vfs_backend_set_mount_spec (G_VFS_BACKEND (backend), mount_spec);
diff --git a/daemon/gvfsjobcopy.c b/daemon/gvfsjobcopy.c
index 785d7480..cf33da56 100644
--- a/daemon/gvfsjobcopy.c
+++ b/daemon/gvfsjobcopy.c
@@ -141,6 +141,13 @@ try (GVfsJob *job)
   GVfsBackendClass *class = G_VFS_BACKEND_GET_CLASS (op_job->backend);
   gboolean res;
 
+  if (g_vfs_backend_get_readonly_lockdown (op_job->backend))
+    {
+      g_vfs_job_failed (job, G_IO_ERROR, G_IO_ERROR_PERMISSION_DENIED,
+                        _("Filesystem is read-only"));
+      return TRUE;
+    }
+
   if (class->try_copy == NULL)
     return FALSE;
   
diff --git a/daemon/gvfsjobdelete.c b/daemon/gvfsjobdelete.c
index 92892f15..8d5e5b8e 100644
--- a/daemon/gvfsjobdelete.c
+++ b/daemon/gvfsjobdelete.c
@@ -120,6 +120,13 @@ try (GVfsJob *job)
   GVfsJobDelete *op_job = G_VFS_JOB_DELETE (job);
   GVfsBackendClass *class = G_VFS_BACKEND_GET_CLASS (op_job->backend);
 
+  if (g_vfs_backend_get_readonly_lockdown (op_job->backend))
+    {
+      g_vfs_job_failed (job, G_IO_ERROR, G_IO_ERROR_PERMISSION_DENIED,
+                        _("Filesystem is read-only"));
+      return TRUE;
+    }
+
   if (class->try_delete == NULL)
     return FALSE;
   
diff --git a/daemon/gvfsjobmakedirectory.c b/daemon/gvfsjobmakedirectory.c
index 98bb28d5..56a9c42a 100644
--- a/daemon/gvfsjobmakedirectory.c
+++ b/daemon/gvfsjobmakedirectory.c
@@ -120,6 +120,13 @@ try (GVfsJob *job)
   GVfsJobMakeDirectory *op_job = G_VFS_JOB_MAKE_DIRECTORY (job);
   GVfsBackendClass *class = G_VFS_BACKEND_GET_CLASS (op_job->backend);
 
+  if (g_vfs_backend_get_readonly_lockdown (op_job->backend))
+    {
+      g_vfs_job_failed (job, G_IO_ERROR, G_IO_ERROR_PERMISSION_DENIED,
+                        _("Filesystem is read-only"));
+      return TRUE;
+    }
+
   if (class->try_make_directory == NULL)
     return FALSE;
   
diff --git a/daemon/gvfsjobmakesymlink.c b/daemon/gvfsjobmakesymlink.c
index 2c55e26b..2684b6fd 100644
--- a/daemon/gvfsjobmakesymlink.c
+++ b/daemon/gvfsjobmakesymlink.c
@@ -124,6 +124,13 @@ try (GVfsJob *job)
   GVfsJobMakeSymlink *op_job = G_VFS_JOB_MAKE_SYMLINK (job);
   GVfsBackendClass *class = G_VFS_BACKEND_GET_CLASS (op_job->backend);
 
+  if (g_vfs_backend_get_readonly_lockdown (op_job->backend))
+    {
+      g_vfs_job_failed (job, G_IO_ERROR, G_IO_ERROR_PERMISSION_DENIED,
+                        _("Filesystem is read-only"));
+      return TRUE;
+    }
+
   if (class->try_make_symlink == NULL)
     return FALSE;
   
diff --git a/daemon/gvfsjobmove.c b/daemon/gvfsjobmove.c
index cc4ad220..5903d17a 100644
--- a/daemon/gvfsjobmove.c
+++ b/daemon/gvfsjobmove.c
@@ -141,6 +141,13 @@ try (GVfsJob *job)
   GVfsBackendClass *class = G_VFS_BACKEND_GET_CLASS (op_job->backend);
   gboolean res;
 
+  if (g_vfs_backend_get_readonly_lockdown (op_job->backend))
+    {
+      g_vfs_job_failed (job, G_IO_ERROR, G_IO_ERROR_PERMISSION_DENIED,
+                        _("Filesystem is read-only"));
+      return TRUE;
+    }
+
   if (class->try_move == NULL)
     return FALSE;
   
diff --git a/daemon/gvfsjobopenforwrite.c b/daemon/gvfsjobopenforwrite.c
index 68eae532..60ce64f9 100644
--- a/daemon/gvfsjobopenforwrite.c
+++ b/daemon/gvfsjobopenforwrite.c
@@ -230,6 +230,13 @@ try (GVfsJob *job)
   GVfsJobOpenForWrite *op_job = G_VFS_JOB_OPEN_FOR_WRITE (job);
   GVfsBackendClass *class = G_VFS_BACKEND_GET_CLASS (op_job->backend);
 
+  if (g_vfs_backend_get_readonly_lockdown (op_job->backend))
+    {
+      g_vfs_job_failed (job, G_IO_ERROR, G_IO_ERROR_PERMISSION_DENIED,
+                        _("Filesystem is read-only"));
+      return TRUE;
+    }
+
   if (op_job->mode == OPEN_FOR_WRITE_CREATE)
     {
       if (class->try_create == NULL)
diff --git a/daemon/gvfsjobpush.c b/daemon/gvfsjobpush.c
index d7e48d86..a8df73a8 100644
--- a/daemon/gvfsjobpush.c
+++ b/daemon/gvfsjobpush.c
@@ -146,6 +146,13 @@ try (GVfsJob *job)
   GVfsBackendClass *class = G_VFS_BACKEND_GET_CLASS (op_job->backend);
   gboolean res;
 
+  if (g_vfs_backend_get_readonly_lockdown (op_job->backend))
+    {
+      g_vfs_job_failed (job, G_IO_ERROR, G_IO_ERROR_PERMISSION_DENIED,
+                        _("Filesystem is read-only"));
+      return TRUE;
+    }
+
   if (class->try_push == NULL)
     return FALSE;
 
diff --git a/daemon/gvfsjobqueryfsinfo.c b/daemon/gvfsjobqueryfsinfo.c
index 898052ea..3363311a 100644
--- a/daemon/gvfsjobqueryfsinfo.c
+++ b/daemon/gvfsjobqueryfsinfo.c
@@ -147,15 +147,10 @@ create_reply (GVfsJob *job,
               GDBusMethodInvocation *invocation)
 {
   GVfsJobQueryFsInfo *op_job = G_VFS_JOB_QUERY_FS_INFO (job);
-  const char *type;
-
-  type = g_vfs_backend_get_backend_type (op_job->backend);
-
-  if (type)
-    g_file_info_set_attribute_string (op_job->file_info,
-                                     G_FILE_ATTRIBUTE_GVFS_BACKEND,
-                                     type);
 
+  g_vfs_backend_add_auto_fs_info (op_job->backend,
+                                  op_job->attribute_matcher,
+                                  op_job->file_info);
   g_file_info_set_attribute_mask (op_job->file_info,
                                   op_job->attribute_matcher);
 
diff --git a/daemon/gvfsjobsetattribute.c b/daemon/gvfsjobsetattribute.c
index 1efe7c94..ac7618a4 100644
--- a/daemon/gvfsjobsetattribute.c
+++ b/daemon/gvfsjobsetattribute.c
@@ -146,6 +146,13 @@ try (GVfsJob *job)
   GVfsJobSetAttribute *op_job = G_VFS_JOB_SET_ATTRIBUTE (job);
   GVfsBackendClass *class = G_VFS_BACKEND_GET_CLASS (op_job->backend);
 
+  if (g_vfs_backend_get_readonly_lockdown (op_job->backend))
+    {
+      g_vfs_job_failed (job, G_IO_ERROR, G_IO_ERROR_PERMISSION_DENIED,
+                        _("Filesystem is read-only"));
+      return TRUE;
+    }
+
   if (class->try_set_attribute == NULL)
     return FALSE;
   
diff --git a/daemon/gvfsjobsetdisplayname.c b/daemon/gvfsjobsetdisplayname.c
index badb10dd..e12ae879 100644
--- a/daemon/gvfsjobsetdisplayname.c
+++ b/daemon/gvfsjobsetdisplayname.c
@@ -124,6 +124,13 @@ try (GVfsJob *job)
   GVfsJobSetDisplayName *op_job = G_VFS_JOB_SET_DISPLAY_NAME (job);
   GVfsBackendClass *class = G_VFS_BACKEND_GET_CLASS (op_job->backend);
 
+  if (g_vfs_backend_get_readonly_lockdown (op_job->backend))
+    {
+      g_vfs_job_failed (job, G_IO_ERROR, G_IO_ERROR_PERMISSION_DENIED,
+                        _("Filesystem is read-only"));
+      return TRUE;
+    }
+
   if (class->try_set_display_name == NULL)
     return FALSE;
   
diff --git a/daemon/gvfsjobtrash.c b/daemon/gvfsjobtrash.c
index 1738f8a2..5234ebf8 100644
--- a/daemon/gvfsjobtrash.c
+++ b/daemon/gvfsjobtrash.c
@@ -119,6 +119,13 @@ try (GVfsJob *job)
   GVfsJobTrash *op_job = G_VFS_JOB_TRASH (job);
   GVfsBackendClass *class = G_VFS_BACKEND_GET_CLASS (op_job->backend);
 
+  if (g_vfs_backend_get_readonly_lockdown (op_job->backend))
+    {
+      g_vfs_job_failed (job, G_IO_ERROR, G_IO_ERROR_PERMISSION_DENIED,
+                        _("Filesystem is read-only"));
+      return TRUE;
+    }
+
   if (class->try_trash == NULL)
     return FALSE;
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