45 lines
1.6 KiB
Diff
45 lines
1.6 KiB
Diff
From 004130ae74688eb321aadc05192bab69fe5cbcbf Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
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Date: Fri, 22 Jul 2022 11:45:12 +0200
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Subject: [PATCH] manager: limit access to private dbus socket
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For the system manager, /run/systemd/private is publicly accessible, because
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/run/systemd is 0755, and /run/systemd/private is 0777. For the user manager,
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/run/user/<uid> is 0700, and /run/user/<uid>/systemd/private is 0777. This
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does not directly cause any security issue because we check the sender in
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bus_check_peercred (ucred.uid != 0 && ucred.uid != geteuid()).
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But it makes sense to limit access to the socket to avoid wasting time in PID1.
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Somebody could send messages there that'd we'd reject anyway. It also makes
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things more explicit.
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(cherry picked from commit df1cbd1adf26071aab41d96e054452a3d66103a4)
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Resolves: #2119405
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---
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src/core/dbus.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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diff --git a/src/core/dbus.c b/src/core/dbus.c
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index 66d838cdb4..ec6c52cb85 100644
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--- a/src/core/dbus.c
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+++ b/src/core/dbus.c
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@@ -42,6 +42,7 @@
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#include "string-util.h"
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#include "strv.h"
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#include "strxcpyx.h"
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+#include "umask-util.h"
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#include "user-util.h"
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#define CONNECTIONS_MAX 4096
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@@ -1019,7 +1020,8 @@ int bus_init_private(Manager *m) {
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if (fd < 0)
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return log_error_errno(errno, "Failed to allocate private socket: %m");
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- r = bind(fd, &sa.sa, salen);
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+ RUN_WITH_UMASK(0077)
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+ r = bind(fd, &sa.sa, salen);
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if (r < 0)
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return log_error_errno(errno, "Failed to bind private socket: %m");
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