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Fix policykit bug

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This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2013-09-18 11:57:13 -05:00
parent 800881a0c5
commit 8e6c340f85
2 changed files with 81 additions and 1 deletions
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75
0027-polkit-Avoid-race-condition-in-scraping-proc.patch Normal file
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@ -0,0 +1,75 @@
From 72fd713962ca2c2450e23b01d9e22017a7e28fd4 Mon Sep 17 00:00:00 2001
From: Colin Walters <walters@verbum.org>
Date: Thu, 22 Aug 2013 13:55:21 -0400
Subject: [PATCH] polkit: Avoid race condition in scraping /proc
If a calling process execve()s a setuid program, it can appear to be
uid 0. Since we're receiving requests over DBus, avoid this by simply
passing system-bus-name as a subject.
---
src/shared/polkit.c | 31 +++++--------------------------
1 file changed, 5 insertions(+), 26 deletions(-)
diff --git a/src/shared/polkit.c b/src/shared/polkit.c
index cea7074..1c5e9e3 100644
--- a/src/shared/polkit.c
+++ b/src/shared/polkit.c
@@ -38,12 +38,8 @@ int verify_polkit(
#ifdef ENABLE_POLKIT
DBusMessage *m = NULL, *reply = NULL;
- const char *unix_process = "unix-process", *pid = "pid", *starttime = "start-time", *cancel_id = "";
+ const char *system_bus_name = "system-bus-name", *name = "name", *cancel_id = "";
uint32_t flags = interactive ? 1 : 0;
- pid_t pid_raw;
- uint32_t pid_u32;
- unsigned long long starttime_raw;
- uint64_t starttime_u64;
DBusMessageIter iter_msg, iter_struct, iter_array, iter_dict, iter_variant;
int r;
dbus_bool_t authorized = FALSE, challenge = FALSE;
@@ -68,14 +64,6 @@ int verify_polkit(
#ifdef ENABLE_POLKIT
- pid_raw = bus_get_unix_process_id(c, sender, error);
- if (pid_raw == 0)
- return -EINVAL;
-
- r = get_starttime_of_pid(pid_raw, &starttime_raw);
- if (r < 0)
- return r;
-
m = dbus_message_new_method_call(
"org.freedesktop.PolicyKit1",
"/org/freedesktop/PolicyKit1/Authority",
@@ -86,22 +74,13 @@ int verify_polkit(
dbus_message_iter_init_append(m, &iter_msg);
- pid_u32 = (uint32_t) pid_raw;
- starttime_u64 = (uint64_t) starttime_raw;
-
if (!dbus_message_iter_open_container(&iter_msg, DBUS_TYPE_STRUCT, NULL, &iter_struct) ||
- !dbus_message_iter_append_basic(&iter_struct, DBUS_TYPE_STRING, &unix_process) ||
+ !dbus_message_iter_append_basic(&iter_struct, DBUS_TYPE_STRING, &system_bus_name) ||
!dbus_message_iter_open_container(&iter_struct, DBUS_TYPE_ARRAY, "{sv}", &iter_array) ||
!dbus_message_iter_open_container(&iter_array, DBUS_TYPE_DICT_ENTRY, NULL, &iter_dict) ||
- !dbus_message_iter_append_basic(&iter_dict, DBUS_TYPE_STRING, &pid) ||
- !dbus_message_iter_open_container(&iter_dict, DBUS_TYPE_VARIANT, "u", &iter_variant) ||
- !dbus_message_iter_append_basic(&iter_variant, DBUS_TYPE_UINT32, &pid_u32) ||
- !dbus_message_iter_close_container(&iter_dict, &iter_variant) ||
- !dbus_message_iter_close_container(&iter_array, &iter_dict) ||
- !dbus_message_iter_open_container(&iter_array, DBUS_TYPE_DICT_ENTRY, NULL, &iter_dict) ||
- !dbus_message_iter_append_basic(&iter_dict, DBUS_TYPE_STRING, &starttime) ||
- !dbus_message_iter_open_container(&iter_dict, DBUS_TYPE_VARIANT, "t", &iter_variant) ||
- !dbus_message_iter_append_basic(&iter_variant, DBUS_TYPE_UINT64, &starttime_u64) ||
+ !dbus_message_iter_append_basic(&iter_dict, DBUS_TYPE_STRING, &name) ||
+ !dbus_message_iter_open_container(&iter_dict, DBUS_TYPE_VARIANT, "s", &iter_variant) ||
+ !dbus_message_iter_append_basic(&iter_variant, DBUS_TYPE_STRING, &sender) ||
!dbus_message_iter_close_container(&iter_dict, &iter_variant) ||
!dbus_message_iter_close_container(&iter_array, &iter_dict) ||
!dbus_message_iter_close_container(&iter_struct, &iter_array) ||
--
1.8.3.1

7
systemd.spec
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@ -16,7 +16,7 @@
Name: systemd
Url: http://www.freedesktop.org/wiki/Software/systemd
Version: 207
Release: 3%{?gitcommit:.git%{gitcommit}}%{?dist}
Release: 4%{?gitcommit:.git%{gitcommit}}%{?dist}
# For a breakdown of the licensing, see README
License: LGPLv2+ and MIT and GPLv2+
Summary: A System and Service Manager
@ -60,6 +60,7 @@ Patch0023: 0023-Verify-validity-of-session-name-when-received-from-o.patch
Patch0024: 0024-udev-rules-avoid-erroring-on-trailing-whitespace.patch
Patch0025: 0025-keymap-Add-Samsung-Series-5-Ultra.patch
Patch0026: 0026-login-fix-login_is_valid-test.patch
Patch0027: 0027-polkit-Avoid-race-condition-in-scraping-proc.patch
# kernel-install patch for grubby, drop if grubby is obsolete
Patch1000: kernel-install-grubby.patch
@ -691,6 +692,10 @@ getent passwd systemd-journal-gateway >/dev/null 2>&1 || useradd -r -l -u 191 -g
%{_datadir}/systemd/gatewayd
%changelog
* Wed Sep 18 2013 Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> 207-4
- Fix policykit authentication
Resolves: rhbz#1006680
* Tue Sep 17 2013 Harald Hoyer <harald@redhat.com> 207-3
- fixed login
Resolves: rhbz#1005233