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From d7d362995aa0cb8905c8d5c2a2a4c305d2ffff80 Mon Sep 17 00:00:00 2001
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From: Ondrej Holy <oholy@redhat.com>
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Date: Thu, 23 May 2019 10:33:30 +0200
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Subject: [PATCH] admin: Use fsuid to ensure correct file ownership
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Files created over admin backend should be owned by root, but they are
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owned by the user itself. This is because the daemon drops the uid to
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make dbus connection work. Use fsuid and euid to fix this issue.
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Closes: https://gitlab.gnome.org/GNOME/gvfs/issues/21
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---
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daemon/gvfsbackendadmin.c | 29 +++++++----------------------
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1 file changed, 7 insertions(+), 22 deletions(-)
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diff --git a/daemon/gvfsbackendadmin.c b/daemon/gvfsbackendadmin.c
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index a74d09cf..32b51b1a 100644
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--- a/daemon/gvfsbackendadmin.c
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+++ b/daemon/gvfsbackendadmin.c
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@@ -157,19 +157,6 @@ complete_job (GVfsJob *job,
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g_vfs_job_succeeded (job);
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}
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-static void
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-fix_file_info (GFileInfo *info)
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-{
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- /* Override read/write flags, since the above call will use access()
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- * to determine permissions, which does not honor our privileged
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- * capabilities.
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- */
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- g_file_info_set_attribute_boolean (info, G_FILE_ATTRIBUTE_ACCESS_CAN_READ, TRUE);
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- g_file_info_set_attribute_boolean (info, G_FILE_ATTRIBUTE_ACCESS_CAN_WRITE, TRUE);
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- g_file_info_set_attribute_boolean (info, G_FILE_ATTRIBUTE_ACCESS_CAN_DELETE, TRUE);
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- g_file_info_set_attribute_boolean (info, G_FILE_ATTRIBUTE_ACCESS_CAN_RENAME, TRUE);
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-}
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-
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static void
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do_query_info (GVfsBackend *backend,
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GVfsJobQueryInfo *query_info_job,
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@@ -195,7 +182,6 @@ do_query_info (GVfsBackend *backend,
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if (error != NULL)
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goto out;
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- fix_file_info (real_info);
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g_file_info_copy_into (real_info, info);
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g_object_unref (real_info);
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@@ -220,7 +206,6 @@ do_query_info_on_read (GVfsBackend *backend,
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if (error != NULL)
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goto out;
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- fix_file_info (real_info);
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g_file_info_copy_into (real_info, info);
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g_object_unref (real_info);
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@@ -245,7 +230,6 @@ do_query_info_on_write (GVfsBackend *backend,
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if (error != NULL)
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goto out;
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- fix_file_info (real_info);
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g_file_info_copy_into (real_info, info);
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g_object_unref (real_info);
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@@ -977,14 +961,15 @@ acquire_caps (uid_t uid)
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struct __user_cap_header_struct hdr;
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struct __user_cap_data_struct data;
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- /* Tell kernel not clear capabilities when dropping root */
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- if (prctl (PR_SET_KEEPCAPS, 1, 0, 0, 0) < 0)
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- g_error ("prctl(PR_SET_KEEPCAPS) failed");
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-
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- /* Drop root uid, but retain the required permitted caps */
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- if (setuid (uid) < 0)
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+ /* Set euid to user to make dbus work */
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+ if (seteuid (uid) < 0)
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g_error ("unable to drop privs");
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+ /* Set fsuid to still behave like root when working with files */
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+ setfsuid (0);
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+ if (setfsuid (-1) != 0)
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+ g_error ("setfsuid failed");
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+
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memset (&hdr, 0, sizeof(hdr));
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hdr.version = _LINUX_CAPABILITY_VERSION;
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--
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2.23.0
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