Fix policykit bug
This commit is contained in:
Zbigniew Jędrzejewski-Szmek
parent
800881a0c5
commit
8e6c340f85
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@ -0,0 +1,75 @@
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From 72fd713962ca2c2450e23b01d9e22017a7e28fd4 Mon Sep 17 00:00:00 2001
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From: Colin Walters <walters@verbum.org>
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Date: Thu, 22 Aug 2013 13:55:21 -0400
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Subject: [PATCH] polkit: Avoid race condition in scraping /proc
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If a calling process execve()s a setuid program, it can appear to be
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uid 0. Since we're receiving requests over DBus, avoid this by simply
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passing system-bus-name as a subject.
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---
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src/shared/polkit.c | 31 +++++--------------------------
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1 file changed, 5 insertions(+), 26 deletions(-)
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diff --git a/src/shared/polkit.c b/src/shared/polkit.c
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index cea7074..1c5e9e3 100644
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--- a/src/shared/polkit.c
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+++ b/src/shared/polkit.c
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@@ -38,12 +38,8 @@ int verify_polkit(
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#ifdef ENABLE_POLKIT
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DBusMessage *m = NULL, *reply = NULL;
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- const char *unix_process = "unix-process", *pid = "pid", *starttime = "start-time", *cancel_id = "";
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+ const char *system_bus_name = "system-bus-name", *name = "name", *cancel_id = "";
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uint32_t flags = interactive ? 1 : 0;
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- pid_t pid_raw;
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- uint32_t pid_u32;
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- unsigned long long starttime_raw;
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- uint64_t starttime_u64;
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DBusMessageIter iter_msg, iter_struct, iter_array, iter_dict, iter_variant;
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int r;
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dbus_bool_t authorized = FALSE, challenge = FALSE;
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@@ -68,14 +64,6 @@ int verify_polkit(
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#ifdef ENABLE_POLKIT
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- pid_raw = bus_get_unix_process_id(c, sender, error);
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- if (pid_raw == 0)
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- return -EINVAL;
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-
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- r = get_starttime_of_pid(pid_raw, &starttime_raw);
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- if (r < 0)
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- return r;
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-
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m = dbus_message_new_method_call(
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"org.freedesktop.PolicyKit1",
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"/org/freedesktop/PolicyKit1/Authority",
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@@ -86,22 +74,13 @@ int verify_polkit(
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dbus_message_iter_init_append(m, &iter_msg);
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- pid_u32 = (uint32_t) pid_raw;
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- starttime_u64 = (uint64_t) starttime_raw;
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-
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if (!dbus_message_iter_open_container(&iter_msg, DBUS_TYPE_STRUCT, NULL, &iter_struct) ||
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- !dbus_message_iter_append_basic(&iter_struct, DBUS_TYPE_STRING, &unix_process) ||
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+ !dbus_message_iter_append_basic(&iter_struct, DBUS_TYPE_STRING, &system_bus_name) ||
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!dbus_message_iter_open_container(&iter_struct, DBUS_TYPE_ARRAY, "{sv}", &iter_array) ||
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!dbus_message_iter_open_container(&iter_array, DBUS_TYPE_DICT_ENTRY, NULL, &iter_dict) ||
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- !dbus_message_iter_append_basic(&iter_dict, DBUS_TYPE_STRING, &pid) ||
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- !dbus_message_iter_open_container(&iter_dict, DBUS_TYPE_VARIANT, "u", &iter_variant) ||
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- !dbus_message_iter_append_basic(&iter_variant, DBUS_TYPE_UINT32, &pid_u32) ||
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- !dbus_message_iter_close_container(&iter_dict, &iter_variant) ||
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- !dbus_message_iter_close_container(&iter_array, &iter_dict) ||
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- !dbus_message_iter_open_container(&iter_array, DBUS_TYPE_DICT_ENTRY, NULL, &iter_dict) ||
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- !dbus_message_iter_append_basic(&iter_dict, DBUS_TYPE_STRING, &starttime) ||
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- !dbus_message_iter_open_container(&iter_dict, DBUS_TYPE_VARIANT, "t", &iter_variant) ||
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- !dbus_message_iter_append_basic(&iter_variant, DBUS_TYPE_UINT64, &starttime_u64) ||
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+ !dbus_message_iter_append_basic(&iter_dict, DBUS_TYPE_STRING, &name) ||
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+ !dbus_message_iter_open_container(&iter_dict, DBUS_TYPE_VARIANT, "s", &iter_variant) ||
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+ !dbus_message_iter_append_basic(&iter_variant, DBUS_TYPE_STRING, &sender) ||
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!dbus_message_iter_close_container(&iter_dict, &iter_variant) ||
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!dbus_message_iter_close_container(&iter_array, &iter_dict) ||
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!dbus_message_iter_close_container(&iter_struct, &iter_array) ||
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--
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1.8.3.1
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@ -16,7 +16,7 @@
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Name: systemd
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Url: http://www.freedesktop.org/wiki/Software/systemd
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Version: 207
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Release: 3%{?gitcommit:.git%{gitcommit}}%{?dist}
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Release: 4%{?gitcommit:.git%{gitcommit}}%{?dist}
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# For a breakdown of the licensing, see README
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License: LGPLv2+ and MIT and GPLv2+
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Summary: A System and Service Manager
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@ -60,6 +60,7 @@ Patch0023: 0023-Verify-validity-of-session-name-when-received-from-o.patch
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Patch0024: 0024-udev-rules-avoid-erroring-on-trailing-whitespace.patch
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Patch0025: 0025-keymap-Add-Samsung-Series-5-Ultra.patch
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Patch0026: 0026-login-fix-login_is_valid-test.patch
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Patch0027: 0027-polkit-Avoid-race-condition-in-scraping-proc.patch
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# kernel-install patch for grubby, drop if grubby is obsolete
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Patch1000: kernel-install-grubby.patch
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@ -691,6 +692,10 @@ getent passwd systemd-journal-gateway >/dev/null 2>&1 || useradd -r -l -u 191 -g
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%{_datadir}/systemd/gatewayd
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%changelog
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* Wed Sep 18 2013 Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> 207-4
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- Fix policykit authentication
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Resolves: rhbz#1006680
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* Tue Sep 17 2013 Harald Hoyer <harald@redhat.com> 207-3
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- fixed login
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Resolves: rhbz#1005233
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