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From d8d0c8c40049cfd824b2b90d0cd47914052b9811 Mon Sep 17 00:00:00 2001
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From: Ondrej Holy <oholy@redhat.com>
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Date: Wed, 2 Jan 2019 17:13:27 +0100
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Subject: [PATCH] admin: Prevent access if any authentication agent isn't
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available
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The backend currently allows to access and modify files without prompting
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for password if any polkit authentication agent isn't available. This seems
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isn't usually problem, because polkit agents are integral parts of
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graphical environments / linux distributions. The agents can't be simply
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disabled without root permissions and are automatically respawned. However,
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this might be a problem in some non-standard cases.
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This affects only users which belong to wheel group (i.e. those who are
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already allowed to use sudo). It doesn't allow privilege escalation for
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users, who don't belong to that group.
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Let's return permission denied error also when the subject can't be
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authorized by any polkit agent to prevent this behavior.
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Closes: https://gitlab.gnome.org/GNOME/gvfs/issues/355
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---
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daemon/gvfsbackendadmin.c | 3 +--
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1 file changed, 1 insertion(+), 2 deletions(-)
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diff --git a/daemon/gvfsbackendadmin.c b/daemon/gvfsbackendadmin.c
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index ec0f2392..0f849008 100644
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--- a/daemon/gvfsbackendadmin.c
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+++ b/daemon/gvfsbackendadmin.c
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@@ -130,8 +130,7 @@ check_permission (GVfsBackendAdmin *self,
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return FALSE;
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}
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- is_authorized = polkit_authorization_result_get_is_authorized (result) ||
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- polkit_authorization_result_get_is_challenge (result);
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+ is_authorized = polkit_authorization_result_get_is_authorized (result);
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g_object_unref (result);
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--
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2.20.1
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