dd5ae4c36c
When dbus client connects to systemd-bus-proxyd through
Unix domain socket proxy takes client's smack label and sets for itself.
It is done before and independent of dropping privileges.
The reason of such soluton is fact that tests of access rights
performed by lsm may take place inside kernel, not only
in userspace of recipient of message.
The bus-proxyd needs CAP_MAC_ADMIN to manipulate its label.
In case of systemd running in system mode, CAP_MAC_ADMIN
should be added to CapabilityBoundingSet in service file of bus-proxyd.
In case of systemd running in user mode ('systemd --user')
it can be achieved by addition
Capabilities=cap_mac_admin=i and SecureBits=keep-caps
to user@.service file
and setting cap_mac_admin+ei on bus-proxyd binary.
47 lines
1.4 KiB
C
47 lines
1.4 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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#pragma once
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <inttypes.h>
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#include <stdbool.h>
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#include <sys/capability.h>
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#include "util.h"
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unsigned long cap_last_cap(void);
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int have_effective_cap(int value);
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int capability_bounding_set_drop(uint64_t drop, bool right_now);
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int capability_bounding_set_drop_usermode(uint64_t drop);
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int drop_privileges(uid_t uid, gid_t gid, uint64_t keep_capabilites);
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int drop_capability(cap_value_t cv);
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DEFINE_TRIVIAL_CLEANUP_FUNC(cap_t, cap_free);
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#define _cleanup_cap_free_ _cleanup_(cap_freep)
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static inline void cap_free_charpp(char **p) {
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if (*p)
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cap_free(*p);
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}
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#define _cleanup_cap_free_charp_ _cleanup_(cap_free_charpp)
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