744 lines
26 KiB
C
744 lines
26 KiB
C
/***
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This file is part of systemd.
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Copyright 2013 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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#ifdef HAVE_VALGRIND_MEMCHECK_H
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#include <valgrind/memcheck.h>
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#endif
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#include <errno.h>
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#include <stddef.h>
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#include "sd-bus.h"
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#include "alloc-util.h"
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#include "bus-bloom.h"
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#include "bus-control.h"
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#include "bus-internal.h"
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#include "bus-message.h"
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#include "bus-util.h"
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#include "capability-util.h"
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#include "stdio-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "user-util.h"
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_public_ int sd_bus_get_unique_name(sd_bus *bus, const char **unique) {
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int r;
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assert_return(bus, -EINVAL);
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assert_return(unique, -EINVAL);
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assert_return(!bus_pid_changed(bus), -ECHILD);
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if (!bus->bus_client)
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return -EINVAL;
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r = bus_ensure_running(bus);
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if (r < 0)
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return r;
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*unique = bus->unique_name;
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return 0;
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}
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static int bus_request_name_dbus1(sd_bus *bus, const char *name, uint64_t flags) {
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_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
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uint32_t ret, param = 0;
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int r;
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assert(bus);
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assert(name);
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if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT)
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param |= BUS_NAME_ALLOW_REPLACEMENT;
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if (flags & SD_BUS_NAME_REPLACE_EXISTING)
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param |= BUS_NAME_REPLACE_EXISTING;
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if (!(flags & SD_BUS_NAME_QUEUE))
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param |= BUS_NAME_DO_NOT_QUEUE;
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r = sd_bus_call_method(
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bus,
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"org.freedesktop.DBus",
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"/org/freedesktop/DBus",
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"org.freedesktop.DBus",
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"RequestName",
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NULL,
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&reply,
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"su",
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name,
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param);
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if (r < 0)
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return r;
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r = sd_bus_message_read(reply, "u", &ret);
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if (r < 0)
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return r;
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if (ret == BUS_NAME_ALREADY_OWNER)
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return -EALREADY;
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else if (ret == BUS_NAME_EXISTS)
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return -EEXIST;
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else if (ret == BUS_NAME_IN_QUEUE)
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return 0;
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else if (ret == BUS_NAME_PRIMARY_OWNER)
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return 1;
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return -EIO;
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}
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_public_ int sd_bus_request_name(sd_bus *bus, const char *name, uint64_t flags) {
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assert_return(bus, -EINVAL);
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assert_return(name, -EINVAL);
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assert_return(!bus_pid_changed(bus), -ECHILD);
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assert_return(!(flags & ~(SD_BUS_NAME_ALLOW_REPLACEMENT|SD_BUS_NAME_REPLACE_EXISTING|SD_BUS_NAME_QUEUE)), -EINVAL);
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assert_return(service_name_is_valid(name), -EINVAL);
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assert_return(name[0] != ':', -EINVAL);
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if (!bus->bus_client)
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return -EINVAL;
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/* Don't allow requesting the special driver and local names */
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if (STR_IN_SET(name, "org.freedesktop.DBus", "org.freedesktop.DBus.Local"))
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return -EINVAL;
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if (!BUS_IS_OPEN(bus->state))
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return -ENOTCONN;
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return bus_request_name_dbus1(bus, name, flags);
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}
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static int bus_release_name_dbus1(sd_bus *bus, const char *name) {
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_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
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uint32_t ret;
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int r;
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assert(bus);
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assert(name);
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r = sd_bus_call_method(
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bus,
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"org.freedesktop.DBus",
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"/org/freedesktop/DBus",
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"org.freedesktop.DBus",
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"ReleaseName",
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NULL,
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&reply,
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"s",
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name);
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if (r < 0)
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return r;
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r = sd_bus_message_read(reply, "u", &ret);
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if (r < 0)
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return r;
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if (ret == BUS_NAME_NON_EXISTENT)
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return -ESRCH;
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if (ret == BUS_NAME_NOT_OWNER)
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return -EADDRINUSE;
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if (ret == BUS_NAME_RELEASED)
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return 0;
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return -EINVAL;
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}
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_public_ int sd_bus_release_name(sd_bus *bus, const char *name) {
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assert_return(bus, -EINVAL);
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assert_return(name, -EINVAL);
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assert_return(!bus_pid_changed(bus), -ECHILD);
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assert_return(service_name_is_valid(name), -EINVAL);
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assert_return(name[0] != ':', -EINVAL);
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if (!bus->bus_client)
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return -EINVAL;
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/* Don't allow releasing the special driver and local names */
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if (STR_IN_SET(name, "org.freedesktop.DBus", "org.freedesktop.DBus.Local"))
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return -EINVAL;
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if (!BUS_IS_OPEN(bus->state))
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return -ENOTCONN;
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return bus_release_name_dbus1(bus, name);
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}
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static int bus_list_names_dbus1(sd_bus *bus, char ***acquired, char ***activatable) {
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_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
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_cleanup_strv_free_ char **x = NULL, **y = NULL;
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int r;
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if (acquired) {
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r = sd_bus_call_method(
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bus,
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"org.freedesktop.DBus",
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"/org/freedesktop/DBus",
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"org.freedesktop.DBus",
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"ListNames",
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NULL,
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&reply,
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NULL);
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if (r < 0)
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return r;
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r = sd_bus_message_read_strv(reply, &x);
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if (r < 0)
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return r;
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reply = sd_bus_message_unref(reply);
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}
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if (activatable) {
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r = sd_bus_call_method(
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bus,
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"org.freedesktop.DBus",
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"/org/freedesktop/DBus",
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"org.freedesktop.DBus",
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"ListActivatableNames",
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NULL,
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&reply,
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NULL);
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if (r < 0)
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return r;
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r = sd_bus_message_read_strv(reply, &y);
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if (r < 0)
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return r;
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*activatable = y;
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y = NULL;
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}
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if (acquired) {
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*acquired = x;
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x = NULL;
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}
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return 0;
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}
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_public_ int sd_bus_list_names(sd_bus *bus, char ***acquired, char ***activatable) {
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assert_return(bus, -EINVAL);
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assert_return(acquired || activatable, -EINVAL);
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assert_return(!bus_pid_changed(bus), -ECHILD);
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if (!bus->bus_client)
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return -EINVAL;
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if (!BUS_IS_OPEN(bus->state))
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return -ENOTCONN;
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return bus_list_names_dbus1(bus, acquired, activatable);
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}
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static int bus_get_name_creds_dbus1(
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sd_bus *bus,
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const char *name,
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uint64_t mask,
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sd_bus_creds **creds) {
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_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply_unique = NULL, *reply = NULL;
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_cleanup_(sd_bus_creds_unrefp) sd_bus_creds *c = NULL;
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const char *unique = NULL;
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pid_t pid = 0;
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int r;
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/* Only query the owner if the caller wants to know it or if
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* the caller just wants to check whether a name exists */
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if ((mask & SD_BUS_CREDS_UNIQUE_NAME) || mask == 0) {
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r = sd_bus_call_method(
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bus,
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"org.freedesktop.DBus",
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"/org/freedesktop/DBus",
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"org.freedesktop.DBus",
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"GetNameOwner",
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NULL,
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&reply_unique,
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"s",
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name);
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if (r < 0)
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return r;
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r = sd_bus_message_read(reply_unique, "s", &unique);
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if (r < 0)
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return r;
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}
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if (mask != 0) {
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_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
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bool need_pid, need_uid, need_selinux, need_separate_calls;
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c = bus_creds_new();
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if (!c)
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return -ENOMEM;
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if ((mask & SD_BUS_CREDS_UNIQUE_NAME) && unique) {
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c->unique_name = strdup(unique);
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if (!c->unique_name)
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return -ENOMEM;
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c->mask |= SD_BUS_CREDS_UNIQUE_NAME;
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}
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need_pid = (mask & SD_BUS_CREDS_PID) ||
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((mask & SD_BUS_CREDS_AUGMENT) &&
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(mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID|
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SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID|
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SD_BUS_CREDS_SUPPLEMENTARY_GIDS|
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SD_BUS_CREDS_COMM|SD_BUS_CREDS_EXE|SD_BUS_CREDS_CMDLINE|
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SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_OWNER_UID|
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SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS|
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SD_BUS_CREDS_SELINUX_CONTEXT|
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SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)));
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need_uid = mask & SD_BUS_CREDS_EUID;
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need_selinux = mask & SD_BUS_CREDS_SELINUX_CONTEXT;
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if (need_pid + need_uid + need_selinux > 1) {
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/* If we need more than one of the credentials, then use GetConnectionCredentials() */
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r = sd_bus_call_method(
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bus,
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"org.freedesktop.DBus",
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"/org/freedesktop/DBus",
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"org.freedesktop.DBus",
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"GetConnectionCredentials",
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&error,
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&reply,
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"s",
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unique ?: name);
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if (r < 0) {
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if (!sd_bus_error_has_name(&error, SD_BUS_ERROR_UNKNOWN_METHOD))
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return r;
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/* If we got an unknown method error, fall back to the invidual calls... */
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need_separate_calls = true;
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sd_bus_error_free(&error);
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} else {
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need_separate_calls = false;
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r = sd_bus_message_enter_container(reply, 'a', "{sv}");
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if (r < 0)
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return r;
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for (;;) {
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const char *m;
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r = sd_bus_message_enter_container(reply, 'e', "sv");
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if (r < 0)
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return r;
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if (r == 0)
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break;
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r = sd_bus_message_read(reply, "s", &m);
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if (r < 0)
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return r;
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if (need_uid && streq(m, "UnixUserID")) {
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uint32_t u;
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r = sd_bus_message_read(reply, "v", "u", &u);
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if (r < 0)
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return r;
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c->euid = u;
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c->mask |= SD_BUS_CREDS_EUID;
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} else if (need_pid && streq(m, "ProcessID")) {
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uint32_t p;
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r = sd_bus_message_read(reply, "v", "u", &p);
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if (r < 0)
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return r;
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pid = p;
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if (mask & SD_BUS_CREDS_PID) {
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c->pid = p;
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c->mask |= SD_BUS_CREDS_PID;
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}
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} else if (need_selinux && streq(m, "LinuxSecurityLabel")) {
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const void *p = NULL;
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size_t sz = 0;
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r = sd_bus_message_enter_container(reply, 'v', "ay");
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if (r < 0)
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return r;
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r = sd_bus_message_read_array(reply, 'y', &p, &sz);
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if (r < 0)
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return r;
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free(c->label);
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c->label = strndup(p, sz);
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if (!c->label)
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return -ENOMEM;
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c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
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r = sd_bus_message_exit_container(reply);
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if (r < 0)
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return r;
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} else {
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r = sd_bus_message_skip(reply, "v");
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if (r < 0)
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return r;
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}
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r = sd_bus_message_exit_container(reply);
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if (r < 0)
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return r;
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}
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r = sd_bus_message_exit_container(reply);
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if (r < 0)
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return r;
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if (need_pid && pid == 0)
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return -EPROTO;
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}
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} else /* When we only need a single field, then let's use separate calls */
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need_separate_calls = true;
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if (need_separate_calls) {
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if (need_pid) {
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uint32_t u;
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r = sd_bus_call_method(
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bus,
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"org.freedesktop.DBus",
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"/org/freedesktop/DBus",
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"org.freedesktop.DBus",
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"GetConnectionUnixProcessID",
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NULL,
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&reply,
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"s",
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unique ?: name);
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if (r < 0)
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return r;
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r = sd_bus_message_read(reply, "u", &u);
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if (r < 0)
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return r;
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pid = u;
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if (mask & SD_BUS_CREDS_PID) {
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c->pid = u;
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c->mask |= SD_BUS_CREDS_PID;
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}
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reply = sd_bus_message_unref(reply);
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}
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if (need_uid) {
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uint32_t u;
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r = sd_bus_call_method(
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bus,
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"org.freedesktop.DBus",
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"/org/freedesktop/DBus",
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"org.freedesktop.DBus",
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"GetConnectionUnixUser",
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NULL,
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&reply,
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"s",
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unique ? unique : name);
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if (r < 0)
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return r;
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r = sd_bus_message_read(reply, "u", &u);
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if (r < 0)
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return r;
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c->euid = u;
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c->mask |= SD_BUS_CREDS_EUID;
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reply = sd_bus_message_unref(reply);
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}
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if (need_selinux) {
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const void *p = NULL;
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size_t sz = 0;
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r = sd_bus_call_method(
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bus,
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"org.freedesktop.DBus",
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"/org/freedesktop/DBus",
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"org.freedesktop.DBus",
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"GetConnectionSELinuxSecurityContext",
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&error,
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&reply,
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"s",
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unique ? unique : name);
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if (r < 0) {
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if (!sd_bus_error_has_name(&error, "org.freedesktop.DBus.Error.SELinuxSecurityContextUnknown"))
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return r;
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/* no data is fine */
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} else {
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r = sd_bus_message_read_array(reply, 'y', &p, &sz);
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if (r < 0)
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return r;
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c->label = strndup(p, sz);
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if (!c->label)
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return -ENOMEM;
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c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
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}
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}
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}
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r = bus_creds_add_more(c, mask, pid, 0);
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if (r < 0)
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return r;
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}
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if (creds) {
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*creds = c;
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c = NULL;
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}
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return 0;
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}
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_public_ int sd_bus_get_name_creds(
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sd_bus *bus,
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const char *name,
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uint64_t mask,
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sd_bus_creds **creds) {
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assert_return(bus, -EINVAL);
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assert_return(name, -EINVAL);
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assert_return((mask & ~SD_BUS_CREDS_AUGMENT) <= _SD_BUS_CREDS_ALL, -EOPNOTSUPP);
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assert_return(mask == 0 || creds, -EINVAL);
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assert_return(!bus_pid_changed(bus), -ECHILD);
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assert_return(service_name_is_valid(name), -EINVAL);
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if (!bus->bus_client)
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return -EINVAL;
|
|
|
|
/* Turn off augmenting if this isn't a local connection. If the connection is not local, then /proc is not
|
|
* going to match. */
|
|
if (!bus->is_local)
|
|
mask &= ~SD_BUS_CREDS_AUGMENT;
|
|
|
|
if (streq(name, "org.freedesktop.DBus.Local"))
|
|
return -EINVAL;
|
|
|
|
if (streq(name, "org.freedesktop.DBus"))
|
|
return sd_bus_get_owner_creds(bus, mask, creds);
|
|
|
|
if (!BUS_IS_OPEN(bus->state))
|
|
return -ENOTCONN;
|
|
|
|
return bus_get_name_creds_dbus1(bus, name, mask, creds);
|
|
}
|
|
|
|
static int bus_get_owner_creds_dbus1(sd_bus *bus, uint64_t mask, sd_bus_creds **ret) {
|
|
_cleanup_(sd_bus_creds_unrefp) sd_bus_creds *c = NULL;
|
|
pid_t pid = 0;
|
|
bool do_label;
|
|
int r;
|
|
|
|
assert(bus);
|
|
|
|
do_label = bus->label && (mask & SD_BUS_CREDS_SELINUX_CONTEXT);
|
|
|
|
/* Avoid allocating anything if we have no chance of returning useful data */
|
|
if (!bus->ucred_valid && !do_label)
|
|
return -ENODATA;
|
|
|
|
c = bus_creds_new();
|
|
if (!c)
|
|
return -ENOMEM;
|
|
|
|
if (bus->ucred_valid) {
|
|
if (bus->ucred.pid > 0) {
|
|
pid = c->pid = bus->ucred.pid;
|
|
c->mask |= SD_BUS_CREDS_PID & mask;
|
|
}
|
|
|
|
if (bus->ucred.uid != UID_INVALID) {
|
|
c->euid = bus->ucred.uid;
|
|
c->mask |= SD_BUS_CREDS_EUID & mask;
|
|
}
|
|
|
|
if (bus->ucred.gid != GID_INVALID) {
|
|
c->egid = bus->ucred.gid;
|
|
c->mask |= SD_BUS_CREDS_EGID & mask;
|
|
}
|
|
}
|
|
|
|
if (do_label) {
|
|
c->label = strdup(bus->label);
|
|
if (!c->label)
|
|
return -ENOMEM;
|
|
|
|
c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
|
|
}
|
|
|
|
r = bus_creds_add_more(c, mask, pid, 0);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
*ret = c;
|
|
c = NULL;
|
|
return 0;
|
|
}
|
|
|
|
_public_ int sd_bus_get_owner_creds(sd_bus *bus, uint64_t mask, sd_bus_creds **ret) {
|
|
assert_return(bus, -EINVAL);
|
|
assert_return((mask & ~SD_BUS_CREDS_AUGMENT) <= _SD_BUS_CREDS_ALL, -EOPNOTSUPP);
|
|
assert_return(ret, -EINVAL);
|
|
assert_return(!bus_pid_changed(bus), -ECHILD);
|
|
|
|
if (!BUS_IS_OPEN(bus->state))
|
|
return -ENOTCONN;
|
|
|
|
if (!bus->is_local)
|
|
mask &= ~SD_BUS_CREDS_AUGMENT;
|
|
|
|
return bus_get_owner_creds_dbus1(bus, mask, ret);
|
|
}
|
|
|
|
#define internal_match(bus, m) \
|
|
((bus)->hello_flags & KDBUS_HELLO_MONITOR \
|
|
? (isempty(m) ? "eavesdrop='true'" : strjoina((m), ",eavesdrop='true'")) \
|
|
: (m))
|
|
|
|
static int bus_add_match_internal_dbus1(
|
|
sd_bus *bus,
|
|
const char *match) {
|
|
|
|
const char *e;
|
|
|
|
assert(bus);
|
|
assert(match);
|
|
|
|
e = internal_match(bus, match);
|
|
|
|
return sd_bus_call_method(
|
|
bus,
|
|
"org.freedesktop.DBus",
|
|
"/org/freedesktop/DBus",
|
|
"org.freedesktop.DBus",
|
|
"AddMatch",
|
|
NULL,
|
|
NULL,
|
|
"s",
|
|
e);
|
|
}
|
|
|
|
int bus_add_match_internal(
|
|
sd_bus *bus,
|
|
const char *match,
|
|
struct bus_match_component *components,
|
|
unsigned n_components,
|
|
uint64_t cookie) {
|
|
|
|
assert(bus);
|
|
|
|
if (!bus->bus_client)
|
|
return -EINVAL;
|
|
|
|
return bus_add_match_internal_dbus1(bus, match);
|
|
}
|
|
|
|
static int bus_remove_match_internal_dbus1(
|
|
sd_bus *bus,
|
|
const char *match) {
|
|
|
|
const char *e;
|
|
|
|
assert(bus);
|
|
assert(match);
|
|
|
|
e = internal_match(bus, match);
|
|
|
|
return sd_bus_call_method(
|
|
bus,
|
|
"org.freedesktop.DBus",
|
|
"/org/freedesktop/DBus",
|
|
"org.freedesktop.DBus",
|
|
"RemoveMatch",
|
|
NULL,
|
|
NULL,
|
|
"s",
|
|
e);
|
|
}
|
|
|
|
int bus_remove_match_internal(
|
|
sd_bus *bus,
|
|
const char *match,
|
|
uint64_t cookie) {
|
|
|
|
assert(bus);
|
|
|
|
if (!bus->bus_client)
|
|
return -EINVAL;
|
|
|
|
return bus_remove_match_internal_dbus1(bus, match);
|
|
}
|
|
|
|
_public_ int sd_bus_get_name_machine_id(sd_bus *bus, const char *name, sd_id128_t *machine) {
|
|
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL, *m = NULL;
|
|
const char *mid;
|
|
int r;
|
|
|
|
assert_return(bus, -EINVAL);
|
|
assert_return(name, -EINVAL);
|
|
assert_return(machine, -EINVAL);
|
|
assert_return(!bus_pid_changed(bus), -ECHILD);
|
|
assert_return(service_name_is_valid(name), -EINVAL);
|
|
|
|
if (!bus->bus_client)
|
|
return -EINVAL;
|
|
|
|
if (!BUS_IS_OPEN(bus->state))
|
|
return -ENOTCONN;
|
|
|
|
if (streq_ptr(name, bus->unique_name))
|
|
return sd_id128_get_machine(machine);
|
|
|
|
r = sd_bus_message_new_method_call(
|
|
bus,
|
|
&m,
|
|
name,
|
|
"/",
|
|
"org.freedesktop.DBus.Peer",
|
|
"GetMachineId");
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_bus_message_set_auto_start(m, false);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_bus_call(bus, m, 0, NULL, &reply);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_bus_message_read(reply, "s", &mid);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return sd_id128_from_string(mid, machine);
|
|
}
|