1777 lines
69 KiB
C
1777 lines
69 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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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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Copyright 2013 Daniel Mack
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Copyright 2014 Kay Sievers
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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 <sys/socket.h>
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#include <sys/un.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/poll.h>
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#include <stddef.h>
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#include <getopt.h>
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#include "log.h"
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#include "util.h"
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#include "socket-util.h"
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#include "sd-daemon.h"
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#include "sd-bus.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 "build.h"
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#include "strv.h"
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#include "def.h"
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#include "capability.h"
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#include "bus-control.h"
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#include "smack-util.h"
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#include "set.h"
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#include "bus-xml-policy.h"
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static char *arg_address = NULL;
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static char *arg_command_line_buffer = NULL;
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static bool arg_drop_privileges = false;
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static char **arg_configuration = NULL;
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static int help(void) {
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printf("%s [OPTIONS...]\n\n"
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"Connect STDIO or a socket to a given bus address.\n\n"
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" -h --help Show this help\n"
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" --version Show package version\n"
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" --drop-privileges Drop privileges\n"
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" --configuration=PATH Configuration file or directory\n"
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" --machine=MACHINE Connect to specified machine\n"
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" --address=ADDRESS Connect to the bus specified by ADDRESS\n"
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" (default: " DEFAULT_SYSTEM_BUS_ADDRESS ")\n",
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program_invocation_short_name);
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return 0;
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_VERSION = 0x100,
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ARG_ADDRESS,
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ARG_DROP_PRIVILEGES,
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ARG_CONFIGURATION,
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ARG_MACHINE,
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, ARG_VERSION },
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{ "address", required_argument, NULL, ARG_ADDRESS },
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{ "drop-privileges", no_argument, NULL, ARG_DROP_PRIVILEGES },
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{ "configuration", required_argument, NULL, ARG_CONFIGURATION },
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{ "machine", required_argument, NULL, ARG_MACHINE },
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{},
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};
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int c, r;
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assert(argc >= 0);
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assert(argv);
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while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
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switch (c) {
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case 'h':
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help();
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return 0;
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case ARG_VERSION:
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puts(PACKAGE_STRING);
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puts(SYSTEMD_FEATURES);
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return 0;
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case ARG_ADDRESS: {
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char *a;
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a = strdup(optarg);
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if (!a)
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return log_oom();
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free(arg_address);
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arg_address = a;
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break;
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}
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case ARG_DROP_PRIVILEGES:
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arg_drop_privileges = true;
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break;
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case ARG_CONFIGURATION:
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r = strv_extend(&arg_configuration, optarg);
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if (r < 0)
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return log_oom();
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break;
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case ARG_MACHINE: {
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_cleanup_free_ char *e = NULL;
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char *a;
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e = bus_address_escape(optarg);
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if (!e)
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return log_oom();
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#ifdef ENABLE_KDBUS
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a = strjoin("x-container-kernel:machine=", e, ";x-container-unix:machine=", e, NULL);
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#else
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a = strjoin("x-container-unix:machine=", e, NULL);
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#endif
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if (!a)
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return log_oom();
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free(arg_address);
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arg_address = a;
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break;
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}
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case '?':
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return -EINVAL;
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default:
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assert_not_reached("Unhandled option");
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}
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/* If the first command line argument is only "x" characters
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* we'll write who we are talking to into it, so that "ps" is
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* explanatory */
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arg_command_line_buffer = argv[optind];
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if (argc > optind + 1 || (arg_command_line_buffer && !in_charset(arg_command_line_buffer, "x"))) {
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log_error("Too many arguments");
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return -EINVAL;
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}
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if (!arg_address) {
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arg_address = strdup(DEFAULT_SYSTEM_BUS_ADDRESS);
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if (!arg_address)
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return log_oom();
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}
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return 1;
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}
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static int rename_service(sd_bus *a, sd_bus *b) {
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_cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
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_cleanup_free_ char *p = NULL, *name = NULL;
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const char *comm;
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char **cmdline;
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uid_t uid;
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pid_t pid;
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int r;
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assert(a);
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assert(b);
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r = sd_bus_get_owner_creds(b, SD_BUS_CREDS_UID|SD_BUS_CREDS_PID|SD_BUS_CREDS_CMDLINE|SD_BUS_CREDS_COMM, &creds);
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if (r < 0)
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return r;
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r = sd_bus_creds_get_uid(creds, &uid);
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if (r < 0)
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return r;
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r = sd_bus_creds_get_pid(creds, &pid);
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if (r < 0)
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return r;
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r = sd_bus_creds_get_cmdline(creds, &cmdline);
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if (r < 0)
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return r;
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r = sd_bus_creds_get_comm(creds, &comm);
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if (r < 0)
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return r;
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name = uid_to_name(uid);
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if (!name)
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return -ENOMEM;
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p = strv_join(cmdline, " ");
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if (!p)
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return -ENOMEM;
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/* The status string gets the full command line ... */
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sd_notifyf(false,
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"STATUS=Processing requests from client PID "PID_FMT" (%s); UID "UID_FMT" (%s)",
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pid, p,
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uid, name);
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/* ... and the argv line only the short comm */
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if (arg_command_line_buffer) {
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size_t m, w;
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m = strlen(arg_command_line_buffer);
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w = snprintf(arg_command_line_buffer, m,
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"[PID "PID_FMT"/%s; UID "UID_FMT"/%s]",
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pid, comm,
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uid, name);
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if (m > w)
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memzero(arg_command_line_buffer + w, m - w);
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}
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log_debug("Running on behalf of PID "PID_FMT" (%s), UID "UID_FMT" (%s), %s",
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pid, p,
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uid, name,
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a->unique_name);
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return 0;
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}
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static int synthesize_name_acquired(sd_bus *a, sd_bus *b, sd_bus_message *m) {
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_cleanup_bus_message_unref_ sd_bus_message *n = NULL;
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const char *name, *old_owner, *new_owner;
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int r;
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assert(a);
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assert(b);
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assert(m);
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/* If we get NameOwnerChanged for our own name, we need to
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* synthesize NameLost/NameAcquired, since socket clients need
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* that, even though it is obsoleted on kdbus */
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if (!a->is_kernel)
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return 0;
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if (!sd_bus_message_is_signal(m, "org.freedesktop.DBus", "NameOwnerChanged") ||
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!streq_ptr(m->path, "/org/freedesktop/DBus") ||
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!streq_ptr(m->sender, "org.freedesktop.DBus"))
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return 0;
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r = sd_bus_message_read(m, "sss", &name, &old_owner, &new_owner);
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if (r < 0)
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return r;
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r = sd_bus_message_rewind(m, true);
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if (r < 0)
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return r;
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if (streq(old_owner, a->unique_name)) {
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r = sd_bus_message_new_signal(
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b,
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&n,
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"/org/freedesktop/DBus",
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"org.freedesktop.DBus",
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"NameLost");
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} else if (streq(new_owner, a->unique_name)) {
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r = sd_bus_message_new_signal(
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b,
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&n,
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"/org/freedesktop/DBus",
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"org.freedesktop.DBus",
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"NameAcquired");
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} else
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return 0;
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if (r < 0)
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return r;
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r = sd_bus_message_append(n, "s", name);
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if (r < 0)
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return r;
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r = bus_message_append_sender(n, "org.freedesktop.DBus");
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if (r < 0)
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return r;
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r = bus_seal_synthetic_message(b, n);
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if (r < 0)
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return r;
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return sd_bus_send(b, n, NULL);
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}
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static int synthetic_driver_send(sd_bus *b, sd_bus_message *m) {
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int r;
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assert(b);
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assert(m);
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r = bus_message_append_sender(m, "org.freedesktop.DBus");
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if (r < 0)
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return r;
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r = bus_seal_synthetic_message(b, m);
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if (r < 0)
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return r;
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return sd_bus_send(b, m, NULL);
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}
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static int synthetic_reply_method_error(sd_bus_message *call, const sd_bus_error *e) {
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_cleanup_bus_message_unref_ sd_bus_message *m = NULL;
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int r;
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assert(call);
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if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
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return 0;
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r = sd_bus_message_new_method_error(call, &m, e);
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if (r < 0)
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return r;
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return synthetic_driver_send(call->bus, m);
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}
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static int synthetic_reply_method_errorf(sd_bus_message *call, const char *name, const char *format, ...) {
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_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
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va_list ap;
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va_start(ap, format);
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bus_error_setfv(&error, name, format, ap);
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va_end(ap);
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return synthetic_reply_method_error(call, &error);
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}
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static int synthetic_reply_method_errno(sd_bus_message *call, int error, const sd_bus_error *p) {
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_cleanup_bus_error_free_ sd_bus_error berror = SD_BUS_ERROR_NULL;
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assert(call);
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if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
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return 0;
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if (sd_bus_error_is_set(p))
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return synthetic_reply_method_error(call, p);
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sd_bus_error_set_errno(&berror, error);
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return synthetic_reply_method_error(call, &berror);
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}
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static int synthetic_reply_method_return(sd_bus_message *call, const char *types, ...) {
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_cleanup_bus_message_unref_ sd_bus_message *m = NULL;
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int r;
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assert(call);
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if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
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return 0;
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r = sd_bus_message_new_method_return(call, &m);
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if (r < 0)
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return r;
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if (!isempty(types)) {
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va_list ap;
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va_start(ap, types);
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r = bus_message_append_ap(m, types, ap);
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va_end(ap);
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if (r < 0)
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return r;
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}
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return synthetic_driver_send(call->bus, m);
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}
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static int synthetic_reply_return_strv(sd_bus_message *call, char **l) {
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_cleanup_bus_message_unref_ sd_bus_message *m = NULL;
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int r;
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assert(call);
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r = sd_bus_message_new_method_return(call, &m);
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if (r < 0)
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return synthetic_reply_method_errno(call, r, NULL);
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r = sd_bus_message_append_strv(m, l);
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if (r < 0)
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return synthetic_reply_method_errno(call, r, NULL);
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return synthetic_driver_send(call->bus, m);
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}
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static int get_creds_by_name(sd_bus *bus, const char *name, uint64_t mask, sd_bus_creds **_creds, sd_bus_error *error) {
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_cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
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int r;
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assert(bus);
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assert(name);
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assert(_creds);
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r = sd_bus_get_name_creds(bus, name, mask, &c);
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if (r == -ESRCH || r == -ENXIO)
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return sd_bus_error_setf(error, SD_BUS_ERROR_NAME_HAS_NO_OWNER, "Name %s is currently not owned by anyone.", name);
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if (r < 0)
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return r;
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if ((c->mask & mask) != mask)
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return -ENOTSUP;
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*_creds = c;
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c = NULL;
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return 0;
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}
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static int get_creds_by_message(sd_bus *bus, sd_bus_message *m, uint64_t mask, sd_bus_creds **_creds, sd_bus_error *error) {
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const char *name;
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int r;
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assert(bus);
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assert(m);
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assert(_creds);
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r = sd_bus_message_read(m, "s", &name);
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if (r < 0)
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return r;
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return get_creds_by_name(bus, name, mask, _creds, error);
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}
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static int process_driver(sd_bus *a, sd_bus *b, sd_bus_message *m, Policy *policy, const struct ucred *ucred, Set *owned_names) {
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int r;
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assert(a);
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assert(b);
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assert(m);
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if (!a->is_kernel)
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return 0;
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if (!streq_ptr(sd_bus_message_get_destination(m), "org.freedesktop.DBus"))
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return 0;
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/* The "Hello()" call is is handled in process_hello() */
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if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus.Introspectable", "Introspect")) {
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if (!sd_bus_message_has_signature(m, ""))
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return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
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return synthetic_reply_method_return(m, "s",
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"<!DOCTYPE node PUBLIC \"-//freedesktop//DTD D-BUS Object Introspection 1.0//EN\" "
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"\"http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd\">\n"
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"<node>\n"
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" <interface name=\"org.freedesktop.DBus.Introspectable\">\n"
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" <method name=\"Introspect\">\n"
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" <arg name=\"data\" type=\"s\" direction=\"out\"/>\n"
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" </method>\n"
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" </interface>\n"
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" <interface name=\"org.freedesktop.DBus\">\n"
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" <method name=\"AddMatch\">\n"
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" <arg type=\"s\" direction=\"in\"/>\n"
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" </method>\n"
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" <method name=\"RemoveMatch\">\n"
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" <arg type=\"s\" direction=\"in\"/>\n"
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" </method>\n"
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|
" <method name=\"GetConnectionSELinuxSecurityContext\">\n"
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" <arg type=\"s\" direction=\"in\"/>\n"
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" <arg type=\"ay\" direction=\"out\"/>\n"
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" </method>\n"
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" <method name=\"GetConnectionUnixProcessID\">\n"
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" <arg type=\"s\" direction=\"in\"/>\n"
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" <arg type=\"u\" direction=\"out\"/>\n"
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" </method>\n"
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" <method name=\"GetConnectionUnixUser\">\n"
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" <arg type=\"s\" direction=\"in\"/>\n"
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" <arg type=\"u\" direction=\"out\"/>\n"
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" </method>\n"
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" <method name=\"GetId\">\n"
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" <arg type=\"s\" direction=\"out\"/>\n"
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" </method>\n"
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" <method name=\"GetNameOwner\">\n"
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" <arg type=\"s\" direction=\"in\"/>\n"
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" <arg type=\"s\" direction=\"out\"/>\n"
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" </method>\n"
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" <method name=\"Hello\">\n"
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" <arg type=\"s\" direction=\"out\"/>\n"
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" </method>\n"
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" <method name=\"ListActivatableNames\">\n"
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" <arg type=\"as\" direction=\"out\"/>\n"
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" </method>\n"
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" <method name=\"ListNames\">\n"
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" <arg type=\"as\" direction=\"out\"/>\n"
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" </method>\n"
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" <method name=\"ListQueuedOwners\">\n"
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|
" <arg type=\"s\" direction=\"in\"/>\n"
|
|
" <arg type=\"as\" direction=\"out\"/>\n"
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|
" </method>\n"
|
|
" <method name=\"NameHasOwner\">\n"
|
|
" <arg type=\"s\" direction=\"in\"/>\n"
|
|
" <arg type=\"b\" direction=\"out\"/>\n"
|
|
" </method>\n"
|
|
" <method name=\"ReleaseName\">\n"
|
|
" <arg type=\"s\" direction=\"in\"/>\n"
|
|
" <arg type=\"u\" direction=\"out\"/>\n"
|
|
" </method>\n"
|
|
" <method name=\"ReloadConfig\">\n"
|
|
" </method>\n"
|
|
" <method name=\"RequestName\">\n"
|
|
" <arg type=\"s\" direction=\"in\"/>\n"
|
|
" <arg type=\"u\" direction=\"in\"/>\n"
|
|
" <arg type=\"u\" direction=\"out\"/>\n"
|
|
" </method>\n"
|
|
" <method name=\"StartServiceByName\">\n"
|
|
" <arg type=\"s\" direction=\"in\"/>\n"
|
|
" <arg type=\"u\" direction=\"in\"/>\n"
|
|
" <arg type=\"u\" direction=\"out\"/>\n"
|
|
" </method>\n"
|
|
" <method name=\"UpdateActivationEnvironment\">\n"
|
|
" <arg type=\"a{ss}\" direction=\"in\"/>\n"
|
|
" </method>\n"
|
|
" <signal name=\"NameAcquired\">\n"
|
|
" <arg type=\"s\"/>\n"
|
|
" </signal>\n"
|
|
" <signal name=\"NameLost\">\n"
|
|
" <arg type=\"s\"/>\n"
|
|
" </signal>\n"
|
|
" <signal name=\"NameOwnerChanged\">\n"
|
|
" <arg type=\"s\"/>\n"
|
|
" <arg type=\"s\"/>\n"
|
|
" <arg type=\"s\"/>\n"
|
|
" </signal>\n"
|
|
" </interface>\n"
|
|
"</node>\n");
|
|
|
|
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "AddMatch")) {
|
|
const char *match;
|
|
|
|
if (!sd_bus_message_has_signature(m, "s"))
|
|
return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
|
|
|
|
r = sd_bus_message_read(m, "s", &match);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
r = sd_bus_add_match(a, NULL, match, NULL, NULL);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
return synthetic_reply_method_return(m, NULL);
|
|
|
|
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "RemoveMatch")) {
|
|
const char *match;
|
|
|
|
if (!sd_bus_message_has_signature(m, "s"))
|
|
return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
|
|
|
|
r = sd_bus_message_read(m, "s", &match);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
r = bus_remove_match_by_string(a, match, NULL, NULL);
|
|
if (r == 0)
|
|
return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_MATCH_RULE_NOT_FOUND, "Match rule not found"));
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
return synthetic_reply_method_return(m, NULL);
|
|
|
|
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetConnectionSELinuxSecurityContext")) {
|
|
_cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
|
|
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
|
|
|
|
if (!sd_bus_message_has_signature(m, "s"))
|
|
return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
|
|
|
|
r = get_creds_by_message(a, m, SD_BUS_CREDS_SELINUX_CONTEXT, &creds, &error);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, &error);
|
|
|
|
return synthetic_reply_method_return(m, "y", creds->label, strlen(creds->label));
|
|
|
|
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetConnectionUnixProcessID")) {
|
|
_cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
|
|
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
|
|
|
|
if (!sd_bus_message_has_signature(m, "s"))
|
|
return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
|
|
|
|
r = get_creds_by_message(a, m, SD_BUS_CREDS_PID, &creds, &error);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, &error);
|
|
|
|
return synthetic_reply_method_return(m, "u", (uint32_t) creds->pid);
|
|
|
|
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetConnectionUnixUser")) {
|
|
_cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
|
|
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
|
|
|
|
if (!sd_bus_message_has_signature(m, "s"))
|
|
return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
|
|
|
|
r = get_creds_by_message(a, m, SD_BUS_CREDS_UID, &creds, &error);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, &error);
|
|
|
|
return synthetic_reply_method_return(m, "u", (uint32_t) creds->uid);
|
|
|
|
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetId")) {
|
|
sd_id128_t server_id;
|
|
char buf[SD_ID128_STRING_MAX];
|
|
|
|
if (!sd_bus_message_has_signature(m, ""))
|
|
return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
|
|
|
|
r = sd_bus_get_bus_id(a, &server_id);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
return synthetic_reply_method_return(m, "s", sd_id128_to_string(server_id, buf));
|
|
|
|
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetNameOwner")) {
|
|
const char *name;
|
|
_cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
|
|
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
|
|
|
|
if (!sd_bus_message_has_signature(m, "s"))
|
|
return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
|
|
|
|
r = sd_bus_message_read(m, "s", &name);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
if (streq(name, "org.freedesktop.DBus"))
|
|
return synthetic_reply_method_return(m, "s", "org.freedesktop.DBus");
|
|
|
|
r = get_creds_by_name(a, name, SD_BUS_CREDS_UNIQUE_NAME, &creds, &error);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, &error);
|
|
|
|
return synthetic_reply_method_return(m, "s", creds->unique_name);
|
|
|
|
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ListActivatableNames")) {
|
|
_cleanup_strv_free_ char **names = NULL;
|
|
|
|
if (!sd_bus_message_has_signature(m, ""))
|
|
return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
|
|
|
|
r = sd_bus_list_names(a, NULL, &names);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
/* Let's sort the names list to make it stable */
|
|
strv_sort(names);
|
|
|
|
return synthetic_reply_return_strv(m, names);
|
|
|
|
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ListNames")) {
|
|
_cleanup_strv_free_ char **names = NULL;
|
|
|
|
if (!sd_bus_message_has_signature(m, ""))
|
|
return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
|
|
|
|
r = sd_bus_list_names(a, &names, NULL);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
r = strv_extend(&names, "org.freedesktop.DBus");
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
/* Let's sort the names list to make it stable */
|
|
strv_sort(names);
|
|
|
|
return synthetic_reply_return_strv(m, names);
|
|
|
|
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ListQueuedOwners")) {
|
|
struct kdbus_cmd_name_list cmd = {};
|
|
struct kdbus_name_list *name_list;
|
|
struct kdbus_name_info *name;
|
|
_cleanup_strv_free_ char **owners = NULL;
|
|
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
|
|
char *arg0;
|
|
int err = 0;
|
|
|
|
if (!sd_bus_message_has_signature(m, "s"))
|
|
return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
|
|
|
|
r = sd_bus_message_read(m, "s", &arg0);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
r = sd_bus_get_name_creds(a, arg0, 0, NULL);
|
|
if (r == -ESRCH || r == -ENXIO) {
|
|
sd_bus_error_setf(&error, SD_BUS_ERROR_NAME_HAS_NO_OWNER, "Could not get owners of name '%s': no such name.", arg0);
|
|
return synthetic_reply_method_errno(m, r, &error);
|
|
}
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
cmd.flags = KDBUS_NAME_LIST_QUEUED;
|
|
r = ioctl(a->input_fd, KDBUS_CMD_NAME_LIST, &cmd);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, -errno, NULL);
|
|
|
|
name_list = (struct kdbus_name_list *) ((uint8_t *) a->kdbus_buffer + cmd.offset);
|
|
|
|
KDBUS_ITEM_FOREACH(name, name_list, names) {
|
|
const char *entry_name = NULL;
|
|
struct kdbus_item *item;
|
|
char *n;
|
|
|
|
KDBUS_ITEM_FOREACH(item, name, items)
|
|
if (item->type == KDBUS_ITEM_OWNED_NAME)
|
|
entry_name = item->name.name;
|
|
|
|
if (!streq_ptr(entry_name, arg0))
|
|
continue;
|
|
|
|
if (asprintf(&n, ":1.%llu", (unsigned long long) name->owner_id) < 0) {
|
|
err = -ENOMEM;
|
|
break;
|
|
}
|
|
|
|
r = strv_consume(&owners, n);
|
|
if (r < 0) {
|
|
err = r;
|
|
break;
|
|
}
|
|
}
|
|
|
|
r = bus_kernel_cmd_free(a, cmd.offset);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
if (err < 0)
|
|
return synthetic_reply_method_errno(m, err, NULL);
|
|
|
|
return synthetic_reply_return_strv(m, owners);
|
|
|
|
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "NameHasOwner")) {
|
|
const char *name;
|
|
|
|
if (!sd_bus_message_has_signature(m, "s"))
|
|
return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
|
|
|
|
r = sd_bus_message_read(m, "s", &name);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
if (streq(name, "org.freedesktop.DBus"))
|
|
return synthetic_reply_method_return(m, "b", true);
|
|
|
|
r = sd_bus_get_name_creds(a, name, 0, NULL);
|
|
if (r < 0 && r != -ESRCH && r != -ENXIO)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
return synthetic_reply_method_return(m, "b", r >= 0);
|
|
|
|
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ReleaseName")) {
|
|
const char *name;
|
|
|
|
if (!sd_bus_message_has_signature(m, "s"))
|
|
return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
|
|
|
|
r = sd_bus_message_read(m, "s", &name);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
r = sd_bus_release_name(a, name);
|
|
if (r < 0) {
|
|
if (r == -ESRCH)
|
|
return synthetic_reply_method_return(m, "u", BUS_NAME_NON_EXISTENT);
|
|
if (r == -EADDRINUSE)
|
|
return synthetic_reply_method_return(m, "u", BUS_NAME_NOT_OWNER);
|
|
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
}
|
|
|
|
set_remove(owned_names, (char*) name);
|
|
|
|
return synthetic_reply_method_return(m, "u", BUS_NAME_RELEASED);
|
|
|
|
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ReloadConfig")) {
|
|
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
|
|
|
|
if (!sd_bus_message_has_signature(m, ""))
|
|
return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
|
|
|
|
r = sd_bus_error_setf(&error, SD_BUS_ERROR_NOT_SUPPORTED, "%s() is not supported", sd_bus_message_get_member(m));
|
|
|
|
return synthetic_reply_method_errno(m, r, &error);
|
|
|
|
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "RequestName")) {
|
|
const char *name;
|
|
uint32_t flags, param;
|
|
bool in_queue;
|
|
|
|
if (!sd_bus_message_has_signature(m, "su"))
|
|
return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
|
|
|
|
r = sd_bus_message_read(m, "su", &name, &flags);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
if (policy && !policy_check_own(policy, ucred->uid, ucred->gid, name))
|
|
return synthetic_reply_method_errno(m, -EPERM, NULL);
|
|
|
|
if ((flags & ~(BUS_NAME_ALLOW_REPLACEMENT|BUS_NAME_REPLACE_EXISTING|BUS_NAME_DO_NOT_QUEUE)) != 0)
|
|
return synthetic_reply_method_errno(m, -EINVAL, NULL);
|
|
|
|
param = 0;
|
|
if (flags & BUS_NAME_ALLOW_REPLACEMENT)
|
|
param |= SD_BUS_NAME_ALLOW_REPLACEMENT;
|
|
if (flags & BUS_NAME_REPLACE_EXISTING)
|
|
param |= SD_BUS_NAME_REPLACE_EXISTING;
|
|
if (!(flags & BUS_NAME_DO_NOT_QUEUE))
|
|
param |= SD_BUS_NAME_QUEUE;
|
|
|
|
r = set_put_strdup(owned_names, name);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
r = sd_bus_request_name(a, name, param);
|
|
if (r < 0) {
|
|
if (r == -EALREADY)
|
|
return synthetic_reply_method_return(m, "u", BUS_NAME_ALREADY_OWNER);
|
|
|
|
set_remove(owned_names, (char*) name);
|
|
|
|
if (r == -EEXIST)
|
|
return synthetic_reply_method_return(m, "u", BUS_NAME_EXISTS);
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
}
|
|
|
|
in_queue = (r == 0);
|
|
|
|
if (in_queue)
|
|
return synthetic_reply_method_return(m, "u", BUS_NAME_IN_QUEUE);
|
|
|
|
return synthetic_reply_method_return(m, "u", BUS_NAME_PRIMARY_OWNER);
|
|
|
|
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "StartServiceByName")) {
|
|
_cleanup_bus_message_unref_ sd_bus_message *msg = NULL;
|
|
const char *name;
|
|
uint32_t flags;
|
|
|
|
if (!sd_bus_message_has_signature(m, "su"))
|
|
return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
|
|
|
|
r = sd_bus_message_read(m, "su", &name, &flags);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
if (flags != 0)
|
|
return synthetic_reply_method_errno(m, -EINVAL, NULL);
|
|
|
|
r = sd_bus_get_name_creds(a, name, 0, NULL);
|
|
if (r >= 0 || streq(name, "org.freedesktop.DBus"))
|
|
return synthetic_reply_method_return(m, "u", BUS_START_REPLY_ALREADY_RUNNING);
|
|
if (r != -ESRCH)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
r = sd_bus_message_new_method_call(
|
|
a,
|
|
&msg,
|
|
name,
|
|
"/",
|
|
"org.freedesktop.DBus.Peer",
|
|
"Ping");
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
r = sd_bus_send(a, msg, NULL);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
return synthetic_reply_method_return(m, "u", BUS_START_REPLY_SUCCESS);
|
|
|
|
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "UpdateActivationEnvironment")) {
|
|
_cleanup_bus_message_unref_ sd_bus_message *msg = NULL;
|
|
_cleanup_strv_free_ char **args = NULL;
|
|
|
|
if (!sd_bus_message_has_signature(m, "a{ss}"))
|
|
return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
|
|
|
|
r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "{ss}");
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
while ((r = sd_bus_message_enter_container(m, SD_BUS_TYPE_DICT_ENTRY, "ss")) > 0) {
|
|
_cleanup_free_ char *s = NULL;
|
|
const char *key;
|
|
const char *value;
|
|
|
|
r = sd_bus_message_read(m, "ss", &key, &value);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
s = strjoin(key, "=", value, NULL);
|
|
if (!s)
|
|
return synthetic_reply_method_errno(m, -ENOMEM, NULL);
|
|
|
|
r = strv_extend(&args, s);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
r = sd_bus_message_exit_container(m);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
}
|
|
|
|
r = sd_bus_message_exit_container(m);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
if (!args)
|
|
return synthetic_reply_method_errno(m, -EINVAL, NULL);
|
|
|
|
r = sd_bus_message_new_method_call(
|
|
a,
|
|
&msg,
|
|
"org.freedesktop.systemd1",
|
|
"/org/freedesktop/systemd1",
|
|
"org.freedesktop.systemd1.Manager",
|
|
"SetEnvironment");
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
r = sd_bus_message_append_strv(msg, args);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
r = sd_bus_call(a, msg, 0, NULL, NULL);
|
|
if (r < 0)
|
|
return synthetic_reply_method_errno(m, r, NULL);
|
|
|
|
return synthetic_reply_method_return(m, NULL);
|
|
|
|
} else {
|
|
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
|
|
|
|
r = sd_bus_error_setf(&error, SD_BUS_ERROR_UNKNOWN_METHOD, "Unknown method '%s'.", m->member);
|
|
|
|
return synthetic_reply_method_errno(m, r, &error);
|
|
}
|
|
}
|
|
|
|
static int handle_policy_error(sd_bus_message *m, int r) {
|
|
if (r == -ESRCH || r == -ENXIO)
|
|
return synthetic_reply_method_errorf(m, SD_BUS_ERROR_NAME_HAS_NO_OWNER, "Name %s is currently not owned by anyone.", m->destination);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int process_policy(sd_bus *from, sd_bus *to, sd_bus_message *m, Policy *policy, const struct ucred *our_ucred, Set *owned_names) {
|
|
int r;
|
|
|
|
assert(from);
|
|
assert(to);
|
|
assert(m);
|
|
|
|
if (!policy)
|
|
return 0;
|
|
|
|
if (from->is_kernel) {
|
|
uid_t sender_uid = UID_INVALID;
|
|
gid_t sender_gid = GID_INVALID;
|
|
char **sender_names = NULL;
|
|
bool granted = false;
|
|
|
|
/* Driver messages are always OK */
|
|
if (streq_ptr(m->sender, "org.freedesktop.DBus"))
|
|
return 0;
|
|
|
|
/* The message came from the kernel, and is sent to our legacy client. */
|
|
sd_bus_creds_get_well_known_names(&m->creds, &sender_names);
|
|
|
|
(void) sd_bus_creds_get_uid(&m->creds, &sender_uid);
|
|
(void) sd_bus_creds_get_gid(&m->creds, &sender_gid);
|
|
|
|
/* First check whether the sender can send the message to our name */
|
|
if (set_isempty(owned_names)) {
|
|
if (policy_check_send(policy, sender_uid, sender_gid, m->header->type, NULL, m->path, m->interface, m->member))
|
|
granted = true;
|
|
} else {
|
|
Iterator i;
|
|
char *n;
|
|
|
|
SET_FOREACH(n, owned_names, i)
|
|
if (policy_check_send(policy, sender_uid, sender_gid, m->header->type, n, m->path, m->interface, m->member)) {
|
|
granted = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (granted) {
|
|
/* Then check whether us (the recipient) can receive from the sender's name */
|
|
if (strv_isempty(sender_names)) {
|
|
if (policy_check_recv(policy, our_ucred->uid, our_ucred->gid, m->header->type, NULL, m->path, m->interface, m->member))
|
|
return 0;
|
|
} else {
|
|
char **n;
|
|
|
|
STRV_FOREACH(n, sender_names) {
|
|
if (policy_check_recv(policy, our_ucred->uid, our_ucred->gid, m->header->type, *n, m->path, m->interface, m->member))
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Return an error back to the caller */
|
|
if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
|
|
return synthetic_reply_method_errorf(m, SD_BUS_ERROR_ACCESS_DENIED, "Access prohibited by XML receiver policy.");
|
|
|
|
/* Return 1, indicating that the message shall not be processed any further */
|
|
return 1;
|
|
}
|
|
|
|
if (to->is_kernel) {
|
|
_cleanup_bus_creds_unref_ sd_bus_creds *destination_creds = NULL;
|
|
uid_t destination_uid = UID_INVALID;
|
|
gid_t destination_gid = GID_INVALID;
|
|
const char *destination_unique = NULL;
|
|
char **destination_names = NULL;
|
|
bool granted = false;
|
|
|
|
/* Driver messages are always OK */
|
|
if (streq_ptr(m->destination, "org.freedesktop.DBus"))
|
|
return 0;
|
|
|
|
/* The message came from the legacy client, and is sent to kdbus. */
|
|
if (m->destination) {
|
|
r = bus_get_name_creds_kdbus(to, m->destination,
|
|
SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME|
|
|
SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID,
|
|
true, &destination_creds);
|
|
if (r < 0)
|
|
return handle_policy_error(m, r);
|
|
|
|
r = sd_bus_creds_get_unique_name(destination_creds, &destination_unique);
|
|
if (r < 0)
|
|
return handle_policy_error(m, r);
|
|
|
|
sd_bus_creds_get_well_known_names(destination_creds, &destination_names);
|
|
|
|
(void) sd_bus_creds_get_uid(destination_creds, &destination_uid);
|
|
(void) sd_bus_creds_get_gid(destination_creds, &destination_gid);
|
|
}
|
|
|
|
/* First check if we (the sender) can send to this name */
|
|
if (strv_isempty(destination_names)) {
|
|
if (policy_check_send(policy, our_ucred->uid, our_ucred->gid, m->header->type, NULL, m->path, m->interface, m->member))
|
|
granted = true;
|
|
} else {
|
|
char **n;
|
|
|
|
STRV_FOREACH(n, destination_names) {
|
|
if (policy_check_send(policy, our_ucred->uid, our_ucred->gid, m->header->type, *n, m->path, m->interface, m->member)) {
|
|
|
|
/* If we made a receiver decision,
|
|
then remember which name's policy
|
|
we used, and to which unique ID it
|
|
mapped when we made the
|
|
decision. Then, let's pass this to
|
|
the kernel when sending the
|
|
message, so that it refuses the
|
|
operation should the name and
|
|
unique ID not map to each other
|
|
anymore. */
|
|
|
|
r = free_and_strdup(&m->destination_ptr, *n);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = bus_kernel_parse_unique_name(destination_unique, &m->verify_destination_id);
|
|
if (r < 0)
|
|
break;
|
|
|
|
granted = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Then check if the recipient can receive from our name */
|
|
if (granted) {
|
|
if (set_isempty(owned_names)) {
|
|
if (policy_check_recv(policy, destination_uid, destination_gid, m->header->type, NULL, m->path, m->interface, m->member))
|
|
return 0;
|
|
} else {
|
|
Iterator i;
|
|
char *n;
|
|
|
|
SET_FOREACH(n, owned_names, i)
|
|
if (policy_check_recv(policy, destination_uid, destination_gid, m->header->type, n, m->path, m->interface, m->member))
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* Return an error back to the caller */
|
|
if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
|
|
return synthetic_reply_method_errorf(m, SD_BUS_ERROR_ACCESS_DENIED, "Access prohibited by XML sender policy.");
|
|
|
|
/* Return 1, indicating that the message shall not be processed any further */
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int process_hello(sd_bus *a, sd_bus *b, sd_bus_message *m, bool *got_hello) {
|
|
_cleanup_bus_message_unref_ sd_bus_message *n = NULL;
|
|
bool is_hello;
|
|
int r;
|
|
|
|
assert(a);
|
|
assert(b);
|
|
assert(m);
|
|
assert(got_hello);
|
|
|
|
/* As reaction to hello we need to respond with two messages:
|
|
* the callback reply and the NameAcquired for the unique
|
|
* name, since hello is otherwise obsolete on kdbus. */
|
|
|
|
is_hello =
|
|
sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "Hello") &&
|
|
streq_ptr(m->destination, "org.freedesktop.DBus");
|
|
|
|
if (!is_hello) {
|
|
|
|
if (*got_hello)
|
|
return 0;
|
|
|
|
log_error("First packet isn't hello (it's %s.%s), aborting.", m->interface, m->member);
|
|
return -EIO;
|
|
}
|
|
|
|
if (*got_hello) {
|
|
log_error("Got duplicate hello, aborting.");
|
|
return -EIO;
|
|
}
|
|
|
|
*got_hello = true;
|
|
|
|
if (!a->is_kernel)
|
|
return 0;
|
|
|
|
r = sd_bus_message_new_method_return(m, &n);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to generate HELLO reply: %m");
|
|
|
|
r = sd_bus_message_append(n, "s", a->unique_name);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to append unique name to HELLO reply: %m");
|
|
|
|
r = bus_message_append_sender(n, "org.freedesktop.DBus");
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to append sender to HELLO reply: %m");
|
|
|
|
r = bus_seal_synthetic_message(b, n);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to seal HELLO reply: %m");
|
|
|
|
r = sd_bus_send(b, n, NULL);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to send HELLO reply: %m");
|
|
|
|
n = sd_bus_message_unref(n);
|
|
r = sd_bus_message_new_signal(
|
|
b,
|
|
&n,
|
|
"/org/freedesktop/DBus",
|
|
"org.freedesktop.DBus",
|
|
"NameAcquired");
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to allocate initial NameAcquired message: %m");
|
|
|
|
r = sd_bus_message_append(n, "s", a->unique_name);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to append unique name to NameAcquired message: %m");
|
|
|
|
r = bus_message_append_sender(n, "org.freedesktop.DBus");
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to append sender to NameAcquired message: %m");
|
|
|
|
r = bus_seal_synthetic_message(b, n);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to seal NameAcquired message: %m");
|
|
|
|
r = sd_bus_send(b, n, NULL);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to send NameAcquired message: %m");
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int patch_sender(sd_bus *a, sd_bus_message *m) {
|
|
char **well_known = NULL;
|
|
sd_bus_creds *c;
|
|
int r;
|
|
|
|
assert(a);
|
|
assert(m);
|
|
|
|
if (!a->is_kernel)
|
|
return 0;
|
|
|
|
/* We will change the sender of messages from the bus driver
|
|
* so that they originate from the bus driver. This is a
|
|
* speciality originating from dbus1, where the bus driver did
|
|
* not have a unique id, but only the well-known name. */
|
|
|
|
c = sd_bus_message_get_creds(m);
|
|
if (!c)
|
|
return 0;
|
|
|
|
r = sd_bus_creds_get_well_known_names(c, &well_known);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (strv_contains(well_known, "org.freedesktop.DBus"))
|
|
m->sender = "org.freedesktop.DBus";
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mac_smack_apply_label_and_drop_cap_mac_admin(pid_t its_pid, const char *new_label) {
|
|
#ifdef HAVE_SMACK
|
|
int r = 0, k;
|
|
|
|
if (!mac_smack_use())
|
|
return 0;
|
|
|
|
if (new_label && its_pid > 0)
|
|
r = mac_smack_apply_pid(its_pid, new_label);
|
|
|
|
k = drop_capability(CAP_MAC_ADMIN);
|
|
return r < 0 ? r : k;
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
int main(int argc, char *argv[]) {
|
|
|
|
_cleanup_bus_close_unref_ sd_bus *a = NULL, *b = NULL;
|
|
sd_id128_t server_id;
|
|
int r, in_fd, out_fd;
|
|
bool got_hello = false;
|
|
bool is_unix;
|
|
struct ucred ucred = {};
|
|
_cleanup_free_ char *peersec = NULL;
|
|
Policy policy_buffer = {}, *policy = NULL;
|
|
_cleanup_set_free_free_ Set *owned_names = NULL;
|
|
|
|
log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
|
|
log_parse_environment();
|
|
log_open();
|
|
|
|
r = parse_argv(argc, argv);
|
|
if (r <= 0)
|
|
goto finish;
|
|
|
|
r = sd_listen_fds(0);
|
|
if (r == 0) {
|
|
in_fd = STDIN_FILENO;
|
|
out_fd = STDOUT_FILENO;
|
|
} else if (r == 1) {
|
|
in_fd = SD_LISTEN_FDS_START;
|
|
out_fd = SD_LISTEN_FDS_START;
|
|
} else {
|
|
log_error("Illegal number of file descriptors passed");
|
|
goto finish;
|
|
}
|
|
|
|
is_unix =
|
|
sd_is_socket(in_fd, AF_UNIX, 0, 0) > 0 &&
|
|
sd_is_socket(out_fd, AF_UNIX, 0, 0) > 0;
|
|
|
|
if (is_unix) {
|
|
(void) getpeercred(in_fd, &ucred);
|
|
(void) getpeersec(in_fd, &peersec);
|
|
|
|
r = mac_smack_apply_label_and_drop_cap_mac_admin(getpid(), peersec);
|
|
if (r < 0)
|
|
log_warning_errno(r, "Failed to set SMACK label (%s) and drop CAP_MAC_ADMIN: %m", peersec);
|
|
}
|
|
|
|
if (arg_drop_privileges) {
|
|
const char *user = "systemd-bus-proxy";
|
|
uid_t uid;
|
|
gid_t gid;
|
|
|
|
r = get_user_creds(&user, &uid, &gid, NULL, NULL);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Cannot resolve user name %s: %m", user);
|
|
goto finish;
|
|
}
|
|
|
|
r = drop_privileges(uid, gid, 1ULL << CAP_IPC_OWNER);
|
|
if (r < 0)
|
|
goto finish;
|
|
}
|
|
|
|
owned_names = set_new(&string_hash_ops);
|
|
if (!owned_names) {
|
|
log_oom();
|
|
goto finish;
|
|
}
|
|
|
|
r = sd_bus_new(&a);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to allocate bus: %m");
|
|
goto finish;
|
|
}
|
|
|
|
r = sd_bus_set_description(a, "sd-proxy");
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to set bus name: %m");
|
|
goto finish;
|
|
}
|
|
|
|
r = sd_bus_set_address(a, arg_address);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to set address to connect to: %m");
|
|
goto finish;
|
|
}
|
|
|
|
r = sd_bus_negotiate_fds(a, is_unix);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to set FD negotiation: %m");
|
|
goto finish;
|
|
}
|
|
|
|
r = sd_bus_negotiate_creds(a, true, SD_BUS_CREDS_UID|SD_BUS_CREDS_PID|SD_BUS_CREDS_GID|SD_BUS_CREDS_SELINUX_CONTEXT);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to set credential negotiation: %m");
|
|
goto finish;
|
|
}
|
|
|
|
if (ucred.pid > 0) {
|
|
a->fake_pids.pid = ucred.pid;
|
|
a->fake_pids_valid = true;
|
|
|
|
a->fake_creds.uid = ucred.uid;
|
|
a->fake_creds.euid = UID_INVALID;
|
|
a->fake_creds.suid = UID_INVALID;
|
|
a->fake_creds.fsuid = UID_INVALID;
|
|
a->fake_creds.gid = ucred.gid;
|
|
a->fake_creds.egid = GID_INVALID;
|
|
a->fake_creds.sgid = GID_INVALID;
|
|
a->fake_creds.fsgid = GID_INVALID;
|
|
a->fake_creds_valid = true;
|
|
}
|
|
|
|
if (peersec) {
|
|
a->fake_label = peersec;
|
|
peersec = NULL;
|
|
}
|
|
|
|
a->manual_peer_interface = true;
|
|
|
|
r = sd_bus_start(a);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to start bus client: %m");
|
|
goto finish;
|
|
}
|
|
|
|
r = sd_bus_get_bus_id(a, &server_id);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to get server ID: %m");
|
|
goto finish;
|
|
}
|
|
|
|
if (a->is_kernel) {
|
|
if (!arg_configuration) {
|
|
const char *scope;
|
|
|
|
r = sd_bus_get_scope(a, &scope);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Couldn't determine bus scope: %m");
|
|
goto finish;
|
|
}
|
|
|
|
if (streq(scope, "system"))
|
|
arg_configuration = strv_new(
|
|
"/etc/dbus-1/system.conf",
|
|
"/etc/dbus-1/system.d/",
|
|
"/etc/dbus-1/system-local.conf",
|
|
NULL);
|
|
else if (streq(scope, "user"))
|
|
arg_configuration = strv_new(
|
|
"/etc/dbus-1/session.conf",
|
|
"/etc/dbus-1/session.d/",
|
|
"/etc/dbus-1/session-local.conf",
|
|
NULL);
|
|
else {
|
|
log_error("Unknown scope %s, don't know which policy to load. Refusing.", scope);
|
|
goto finish;
|
|
}
|
|
|
|
if (!arg_configuration) {
|
|
r = log_oom();
|
|
goto finish;
|
|
}
|
|
}
|
|
|
|
r = policy_load(&policy_buffer, arg_configuration);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to load policy: %m");
|
|
goto finish;
|
|
}
|
|
|
|
policy = &policy_buffer;
|
|
/* policy_dump(policy); */
|
|
|
|
if (!policy_check_hello(policy, ucred.uid, ucred.gid)) {
|
|
r = log_error_errno(EPERM, "Policy denied connection.");
|
|
goto finish;
|
|
}
|
|
}
|
|
|
|
r = sd_bus_new(&b);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to allocate bus: %m");
|
|
goto finish;
|
|
}
|
|
|
|
r = sd_bus_set_fd(b, in_fd, out_fd);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to set fds: %m");
|
|
goto finish;
|
|
}
|
|
|
|
r = sd_bus_set_server(b, 1, server_id);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to set server mode: %m");
|
|
goto finish;
|
|
}
|
|
|
|
r = sd_bus_negotiate_fds(b, is_unix);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to set FD negotiation: %m");
|
|
goto finish;
|
|
}
|
|
|
|
r = sd_bus_negotiate_creds(b, true, SD_BUS_CREDS_UID|SD_BUS_CREDS_PID|SD_BUS_CREDS_GID|SD_BUS_CREDS_SELINUX_CONTEXT);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to set credential negotiation: %m");
|
|
goto finish;
|
|
}
|
|
|
|
r = sd_bus_set_anonymous(b, true);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to set anonymous authentication: %m");
|
|
goto finish;
|
|
}
|
|
|
|
b->manual_peer_interface = true;
|
|
|
|
r = sd_bus_start(b);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to start bus client: %m");
|
|
goto finish;
|
|
}
|
|
|
|
r = rename_service(a, b);
|
|
if (r < 0)
|
|
log_debug_errno(r, "Failed to rename process: %m");
|
|
|
|
if (a->is_kernel) {
|
|
_cleanup_free_ char *match = NULL;
|
|
const char *unique;
|
|
|
|
r = sd_bus_get_unique_name(a, &unique);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to get unique name: %m");
|
|
goto finish;
|
|
}
|
|
|
|
match = strjoin("type='signal',"
|
|
"sender='org.freedesktop.DBus',"
|
|
"path='/org/freedesktop/DBus',"
|
|
"interface='org.freedesktop.DBus',"
|
|
"member='NameOwnerChanged',"
|
|
"arg1='",
|
|
unique,
|
|
"'",
|
|
NULL);
|
|
if (!match) {
|
|
log_oom();
|
|
goto finish;
|
|
}
|
|
|
|
r = sd_bus_add_match(a, NULL, match, NULL, NULL);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to add match for NameLost: %m");
|
|
goto finish;
|
|
}
|
|
|
|
free(match);
|
|
match = strjoin("type='signal',"
|
|
"sender='org.freedesktop.DBus',"
|
|
"path='/org/freedesktop/DBus',"
|
|
"interface='org.freedesktop.DBus',"
|
|
"member='NameOwnerChanged',"
|
|
"arg2='",
|
|
unique,
|
|
"'",
|
|
NULL);
|
|
if (!match) {
|
|
log_oom();
|
|
goto finish;
|
|
}
|
|
|
|
r = sd_bus_add_match(a, NULL, match, NULL, NULL);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to add match for NameAcquired: %m");
|
|
goto finish;
|
|
}
|
|
}
|
|
|
|
for (;;) {
|
|
_cleanup_bus_message_unref_ sd_bus_message *m = NULL;
|
|
int events_a, events_b, fd;
|
|
uint64_t timeout_a, timeout_b, t;
|
|
struct timespec _ts, *ts;
|
|
struct pollfd *pollfd;
|
|
int k;
|
|
|
|
if (got_hello) {
|
|
/* Read messages from bus, to pass them on to our client */
|
|
|
|
r = sd_bus_process(a, &m);
|
|
if (r < 0) {
|
|
/* treat 'connection reset by peer' as clean exit condition */
|
|
if (r == -ECONNRESET)
|
|
r = 0;
|
|
else
|
|
log_error_errno(r, "Failed to process bus a: %m");
|
|
|
|
goto finish;
|
|
}
|
|
|
|
if (m) {
|
|
bool processed = false;
|
|
|
|
/* We officially got EOF, let's quit */
|
|
if (sd_bus_message_is_signal(m, "org.freedesktop.DBus.Local", "Disconnected")) {
|
|
r = 0;
|
|
goto finish;
|
|
}
|
|
|
|
k = synthesize_name_acquired(a, b, m);
|
|
if (k < 0) {
|
|
r = k;
|
|
log_error_errno(r, "Failed to synthesize message: %m");
|
|
goto finish;
|
|
}
|
|
|
|
patch_sender(a, m);
|
|
|
|
if (policy) {
|
|
k = process_policy(a, b, m, policy, &ucred, owned_names);
|
|
if (k < 0) {
|
|
r = k;
|
|
log_error_errno(r, "Failed to process policy: %m");
|
|
goto finish;
|
|
} else if (k > 0) {
|
|
r = 1;
|
|
processed = true;
|
|
}
|
|
}
|
|
|
|
if (!processed) {
|
|
k = sd_bus_send(b, m, NULL);
|
|
if (k < 0) {
|
|
if (k == -ECONNRESET)
|
|
r = 0;
|
|
else {
|
|
r = k;
|
|
log_error_errno(r, "Failed to send message to client: %m");
|
|
}
|
|
|
|
goto finish;
|
|
} else
|
|
r = 1;
|
|
}
|
|
}
|
|
|
|
if (r > 0)
|
|
continue;
|
|
}
|
|
|
|
/* Read messages from our client, to pass them on to the bus */
|
|
r = sd_bus_process(b, &m);
|
|
if (r < 0) {
|
|
/* treat 'connection reset by peer' as clean exit condition */
|
|
if (r == -ECONNRESET)
|
|
r = 0;
|
|
else
|
|
log_error_errno(r, "Failed to process bus b: %m");
|
|
|
|
goto finish;
|
|
}
|
|
|
|
if (m) {
|
|
bool processed = false;
|
|
|
|
/* We officially got EOF, let's quit */
|
|
if (sd_bus_message_is_signal(m, "org.freedesktop.DBus.Local", "Disconnected")) {
|
|
r = 0;
|
|
goto finish;
|
|
}
|
|
|
|
k = process_hello(a, b, m, &got_hello);
|
|
if (k < 0) {
|
|
r = k;
|
|
log_error_errno(r, "Failed to process HELLO: %m");
|
|
goto finish;
|
|
} else if (k > 0) {
|
|
processed = true;
|
|
r = 1;
|
|
}
|
|
|
|
if (!processed) {
|
|
k = process_driver(a, b, m, policy, &ucred, owned_names);
|
|
if (k < 0) {
|
|
r = k;
|
|
log_error_errno(r, "Failed to process driver calls: %m");
|
|
goto finish;
|
|
} else if (k > 0) {
|
|
processed = true;
|
|
r = 1;
|
|
}
|
|
|
|
if (!processed) {
|
|
|
|
for (;;) {
|
|
if (policy) {
|
|
k = process_policy(b, a, m, policy, &ucred, owned_names);
|
|
if (k < 0) {
|
|
r = k;
|
|
log_error_errno(r, "Failed to process policy: %m");
|
|
goto finish;
|
|
} else if (k > 0) {
|
|
processed = true;
|
|
r = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
k = sd_bus_send(a, m, NULL);
|
|
if (k < 0) {
|
|
if (k == -EREMCHG)
|
|
/* The name database changed since the policy check, hence let's check again */
|
|
continue;
|
|
else if (k == -ECONNRESET)
|
|
r = 0;
|
|
else {
|
|
r = k;
|
|
log_error_errno(r, "Failed to send message to bus: %m");
|
|
}
|
|
|
|
goto finish;
|
|
} else
|
|
r = 1;
|
|
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (r > 0)
|
|
continue;
|
|
|
|
fd = sd_bus_get_fd(a);
|
|
if (fd < 0) {
|
|
log_error_errno(r, "Failed to get fd: %m");
|
|
goto finish;
|
|
}
|
|
|
|
events_a = sd_bus_get_events(a);
|
|
if (events_a < 0) {
|
|
log_error_errno(r, "Failed to get events mask: %m");
|
|
goto finish;
|
|
}
|
|
|
|
r = sd_bus_get_timeout(a, &timeout_a);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to get timeout: %m");
|
|
goto finish;
|
|
}
|
|
|
|
events_b = sd_bus_get_events(b);
|
|
if (events_b < 0) {
|
|
log_error_errno(r, "Failed to get events mask: %m");
|
|
goto finish;
|
|
}
|
|
|
|
r = sd_bus_get_timeout(b, &timeout_b);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to get timeout: %m");
|
|
goto finish;
|
|
}
|
|
|
|
t = timeout_a;
|
|
if (t == (uint64_t) -1 || (timeout_b != (uint64_t) -1 && timeout_b < timeout_a))
|
|
t = timeout_b;
|
|
|
|
if (t == (uint64_t) -1)
|
|
ts = NULL;
|
|
else {
|
|
usec_t nw;
|
|
|
|
nw = now(CLOCK_MONOTONIC);
|
|
if (t > nw)
|
|
t -= nw;
|
|
else
|
|
t = 0;
|
|
|
|
ts = timespec_store(&_ts, t);
|
|
}
|
|
|
|
pollfd = (struct pollfd[3]) {
|
|
{.fd = fd, .events = events_a, },
|
|
{.fd = in_fd, .events = events_b & POLLIN, },
|
|
{.fd = out_fd, .events = events_b & POLLOUT, }
|
|
};
|
|
|
|
r = ppoll(pollfd, 3, ts, NULL);
|
|
if (r < 0) {
|
|
log_error_errno(errno, "ppoll() failed: %m");
|
|
goto finish;
|
|
}
|
|
}
|
|
|
|
finish:
|
|
sd_notify(false,
|
|
"STOPPING=1\n"
|
|
"STATUS=Shutting down.");
|
|
|
|
policy_free(&policy_buffer);
|
|
strv_free(arg_configuration);
|
|
free(arg_address);
|
|
|
|
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
|
|
}
|