src/login/pam-module.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <fcntl.h>
  24 #include <sys/file.h>
  25 #include <pwd.h>
  26 #include <endian.h>
  27 #include <sys/capability.h>
  28
  29 #include <security/pam_modules.h>
  30 #include <security/_pam_macros.h>
  31 #include <security/pam_modutil.h>
  32 #include <security/pam_ext.h>
  33 #include <security/pam_misc.h>
  34
  35 #include <systemd/sd-daemon.h>
  36
  37 #include "util.h"
  38 #include "audit.h"
  39 #include "macro.h"
  40 #include "strv.h"
  41 #include "dbus-common.h"
  42 #include "def.h"
  43 #include "socket-util.h"
  44
  45 static int parse_argv(pam_handle_t *handle,
  46                       int argc, const char **argv,
  47                       char ***controllers,
  48                       char ***reset_controllers,
  49                       bool *kill_processes,
  50                       char ***kill_only_users,
  51                       char ***kill_exclude_users,
  52                       bool *debug) {
  53
  54         unsigned i;
  55
  56         assert(argc >= 0);
  57         assert(argc == 0 || argv);
  58
  59         for (i = 0; i < (unsigned) argc; i++) {
  60                 int k;
  61
  62                 if (startswith(argv[i], "kill-session-processes=")) {
  63                         if ((k = parse_boolean(argv[i] + 23)) < 0) {
  64                                 pam_syslog(handle, LOG_ERR, "Failed to parse kill-session-processes= argument.");
  65                                 return k;
  66                         }
  67
  68                         if (kill_processes)
  69                                 *kill_processes = k;
  70
  71                 } else if (startswith(argv[i], "kill-session=")) {
  72                         /* As compatibility for old versions */
  73
  74                         if ((k = parse_boolean(argv[i] + 13)) < 0) {
  75                                 pam_syslog(handle, LOG_ERR, "Failed to parse kill-session= argument.");
  76                                 return k;
  77                         }
  78
  79                         if (kill_processes)
  80                                 *kill_processes = k;
  81
  82                 } else if (startswith(argv[i], "controllers=")) {
  83
  84                         if (controllers) {
  85                                 char **l;
  86
  87                                 if (!(l = strv_split(argv[i] + 12, ","))) {
  88                                         pam_syslog(handle, LOG_ERR, "Out of memory.");
  89                                         return -ENOMEM;
  90                                 }
  91
  92                                 strv_free(*controllers);
  93                                 *controllers = l;
  94                         }
  95
  96                 } else if (startswith(argv[i], "reset-controllers=")) {
  97
  98                         if (reset_controllers) {
  99                                 char **l;
 100
 101                                 if (!(l = strv_split(argv[i] + 18, ","))) {
 102                                         pam_syslog(handle, LOG_ERR, "Out of memory.");
 103                                         return -ENOMEM;
 104                                 }
 105
 106                                 strv_free(*reset_controllers);
 107                                 *reset_controllers = l;
 108                         }
 109
 110                 } else if (startswith(argv[i], "kill-only-users=")) {
 111
 112                         if (kill_only_users) {
 113                                 char **l;
 114
 115                                 if (!(l = strv_split(argv[i] + 16, ","))) {
 116                                         pam_syslog(handle, LOG_ERR, "Out of memory.");
 117                                         return -ENOMEM;
 118                                 }
 119
 120                                 strv_free(*kill_only_users);
 121                                 *kill_only_users = l;
 122                         }
 123
 124                 } else if (startswith(argv[i], "kill-exclude-users=")) {
 125
 126                         if (kill_exclude_users) {
 127                                 char **l;
 128
 129                                 if (!(l = strv_split(argv[i] + 19, ","))) {
 130                                         pam_syslog(handle, LOG_ERR, "Out of memory.");
 131                                         return -ENOMEM;
 132                                 }
 133
 134                                 strv_free(*kill_exclude_users);
 135                                 *kill_exclude_users = l;
 136                         }
 137
 138                 } else if (startswith(argv[i], "debug=")) {
 139                         if ((k = parse_boolean(argv[i] + 6)) < 0) {
 140                                 pam_syslog(handle, LOG_ERR, "Failed to parse debug= argument.");
 141                                 return k;
 142                         }
 143
 144                         if (debug)
 145                                 *debug = k;
 146
 147                 } else if (startswith(argv[i], "create-session=") ||
 148                            startswith(argv[i], "kill-user=")) {
 149
 150                         pam_syslog(handle, LOG_WARNING, "Option %s not supported anymore, ignoring.", argv[i]);
 151
 152                 } else {
 153                         pam_syslog(handle, LOG_ERR, "Unknown parameter '%s'.", argv[i]);
 154                         return -EINVAL;
 155                 }
 156         }
 157
 158         return 0;
 159 }
 160
 161 static int get_user_data(
 162                 pam_handle_t *handle,
 163                 const char **ret_username,
 164                 struct passwd **ret_pw) {
 165
 166         const char *username = NULL;
 167         struct passwd *pw = NULL;
 168         uid_t uid;
 169         int r;
 170
 171         assert(handle);
 172         assert(ret_username);
 173         assert(ret_pw);
 174
 175         r = audit_loginuid_from_pid(0, &uid);
 176         if (r >= 0)
 177                 pw = pam_modutil_getpwuid(handle, uid);
 178         else {
 179                 r = pam_get_user(handle, &username, NULL);
 180                 if (r != PAM_SUCCESS) {
 181                         pam_syslog(handle, LOG_ERR, "Failed to get user name.");
 182                         return r;
 183                 }
 184
 185                 if (isempty(username)) {
 186                         pam_syslog(handle, LOG_ERR, "User name not valid.");
 187                         return PAM_AUTH_ERR;
 188                 }
 189
 190                 pw = pam_modutil_getpwnam(handle, username);
 191         }
 192
 193         if (!pw) {
 194                 pam_syslog(handle, LOG_ERR, "Failed to get user data.");
 195                 return PAM_USER_UNKNOWN;
 196         }
 197
 198         *ret_pw = pw;
 199         *ret_username = username ? username : pw->pw_name;
 200
 201         return PAM_SUCCESS;
 202 }
 203
 204 static bool check_user_lists(
 205                 pam_handle_t *handle,
 206                 uid_t uid,
 207                 char **kill_only_users,
 208                 char **kill_exclude_users) {
 209
 210         const char *name = NULL;
 211         char **l;
 212
 213         assert(handle);
 214
 215         if (uid == 0)
 216                 name = "root"; /* Avoid obvious NSS requests, to suppress network traffic */
 217         else {
 218                 struct passwd *pw;
 219
 220                 pw = pam_modutil_getpwuid(handle, uid);
 221                 if (pw)
 222                         name = pw->pw_name;
 223         }
 224
 225         STRV_FOREACH(l, kill_exclude_users) {
 226                 uid_t u;
 227
 228                 if (parse_uid(*l, &u) >= 0)
 229                         if (u == uid)
 230                                 return false;
 231
 232                 if (name && streq(name, *l))
 233                         return false;
 234         }
 235
 236         if (strv_isempty(kill_only_users))
 237                 return true;
 238
 239         STRV_FOREACH(l, kill_only_users) {
 240                 uid_t u;
 241
 242                 if (parse_uid(*l, &u) >= 0)
 243                         if (u == uid)
 244                                 return true;
 245
 246                 if (name && streq(name, *l))
 247                         return true;
 248         }
 249
 250         return false;
 251 }
 252
 253 static int get_seat_from_display(const char *display, const char **seat, uint32_t *vtnr) {
 254         char *p = NULL;
 255         int r;
 256         int fd;
 257         union sockaddr_union sa;
 258         struct ucred ucred;
 259         socklen_t l;
 260         char *tty;
 261         int v;
 262
 263         assert(display);
 264         assert(vtnr);
 265
 266         /* We deduce the X11 socket from the display name, then use
 267          * SO_PEERCRED to determine the X11 server process, ask for
 268          * the controlling tty of that and if it's a VC then we know
 269          * the seat and the virtual terminal. Sounds ugly, is only
 270          * semi-ugly. */
 271
 272         r = socket_from_display(display, &p);
 273         if (r < 0)
 274                 return r;
 275
 276         fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0);
 277         if (fd < 0) {
 278                 free(p);
 279                 return -errno;
 280         }
 281
 282         zero(sa);
 283         sa.un.sun_family = AF_UNIX;
 284         strncpy(sa.un.sun_path, p, sizeof(sa.un.sun_path)-1);
 285         free(p);
 286
 287         if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {
 288                 close_nointr_nofail(fd);
 289                 return -errno;
 290         }
 291
 292         l = sizeof(ucred);
 293         r = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l);
 294         close_nointr_nofail(fd);
 295
 296         if (r < 0)
 297                 return -errno;
 298
 299         r = get_ctty(ucred.pid, NULL, &tty);
 300         if (r < 0)
 301                 return r;
 302
 303         v = vtnr_from_tty(tty);
 304         free(tty);
 305
 306         if (v < 0)
 307                 return v;
 308         else if (v == 0)
 309                 return -ENOENT;
 310
 311         if (seat)
 312                 *seat = "seat0";
 313         *vtnr = (uint32_t) v;
 314
 315         return 0;
 316 }
 317
 318 _public_ PAM_EXTERN int pam_sm_open_session(
 319                 pam_handle_t *handle,
 320                 int flags,
 321                 int argc, const char **argv) {
 322
 323         struct passwd *pw;
 324         bool kill_processes = false, debug = false;
 325         const char *username, *id, *object_path, *runtime_path, *service = NULL, *tty = NULL, *display = NULL, *remote_user = NULL, *remote_host = NULL, *seat = NULL, *type, *class, *cvtnr = NULL;
 326         char **controllers = NULL, **reset_controllers = NULL, **kill_only_users = NULL, **kill_exclude_users = NULL;
 327         DBusError error;
 328         uint32_t uid, pid;
 329         DBusMessageIter iter;
 330         dbus_bool_t kp;
 331         int session_fd = -1;
 332         DBusConnection *bus = NULL;
 333         DBusMessage *m = NULL, *reply = NULL;
 334         dbus_bool_t remote;
 335         int r;
 336         uint32_t vtnr = 0;
 337
 338         assert(handle);
 339
 340         dbus_error_init(&error);
 341
 342         /* pam_syslog(handle, LOG_INFO, "pam-systemd initializing"); */
 343
 344         /* Make this a NOP on non-systemd systems */
 345         if (sd_booted() <= 0)
 346                 return PAM_SUCCESS;
 347
 348         if (parse_argv(handle,
 349                        argc, argv,
 350                        &controllers, &reset_controllers,
 351                        &kill_processes, &kill_only_users, &kill_exclude_users,
 352                        &debug) < 0) {
 353                 r = PAM_SESSION_ERR;
 354                 goto finish;
 355         }
 356
 357         r = get_user_data(handle, &username, &pw);
 358         if (r != PAM_SUCCESS)
 359                 goto finish;
 360
 361         /* Make sure we don't enter a loop by talking to
 362          * systemd-logind when it is actually waiting for the
 363          * background to finish start-up. If the service is
 364          * "systemd-shared" we simply set XDG_RUNTIME_DIR and
 365          * leave. */
 366
 367         pam_get_item(handle, PAM_SERVICE, (const void**) &service);
 368         if (streq_ptr(service, "systemd-shared")) {
 369                 char *p, *rt = NULL;
 370
 371                 if (asprintf(&p, "/run/systemd/users/%lu", (unsigned long) pw->pw_uid) < 0) {
 372                         r = PAM_BUF_ERR;
 373                         goto finish;
 374                 }
 375
 376                 r = parse_env_file(p, NEWLINE,
 377                                    "RUNTIME", &rt,
 378                                    NULL);
 379                 free(p);
 380
 381                 if (r < 0 && r != -ENOENT) {
 382                         r = PAM_SESSION_ERR;
 383                         free(rt);
 384                         goto finish;
 385                 }
 386
 387                 if (rt)  {
 388                         r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", rt, 0);
 389                         free(rt);
 390
 391                         if (r != PAM_SUCCESS) {
 392                                 pam_syslog(handle, LOG_ERR, "Failed to set runtime dir.");
 393                                 goto finish;
 394                         }
 395                 }
 396
 397                 r = PAM_SUCCESS;
 398                 goto finish;
 399         }
 400
 401         if (kill_processes)
 402                 kill_processes = check_user_lists(handle, pw->pw_uid, kill_only_users, kill_exclude_users);
 403
 404         dbus_connection_set_change_sigpipe(FALSE);
 405
 406         bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
 407         if (!bus) {
 408                 pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", bus_error_message(&error));
 409                 r = PAM_SESSION_ERR;
 410                 goto finish;
 411         }
 412
 413         m = dbus_message_new_method_call(
 414                         "org.freedesktop.login1",
 415                         "/org/freedesktop/login1",
 416                         "org.freedesktop.login1.Manager",
 417                         "CreateSession");
 418         if (!m) {
 419                 pam_syslog(handle, LOG_ERR, "Could not allocate create session message.");
 420                 r = PAM_BUF_ERR;
 421                 goto finish;
 422         }
 423
 424         uid = pw->pw_uid;
 425         pid = getpid();
 426
 427         pam_get_item(handle, PAM_XDISPLAY, (const void**) &display);
 428         pam_get_item(handle, PAM_TTY, (const void**) &tty);
 429         pam_get_item(handle, PAM_RUSER, (const void**) &remote_user);
 430         pam_get_item(handle, PAM_RHOST, (const void**) &remote_host);
 431         seat = pam_getenv(handle, "XDG_SEAT");
 432         cvtnr = pam_getenv(handle, "XDG_VTNR");
 433
 434         service = strempty(service);
 435         tty = strempty(tty);
 436         display = strempty(display);
 437         remote_user = strempty(remote_user);
 438         remote_host = strempty(remote_host);
 439         seat = strempty(seat);
 440
 441         if (strchr(tty, ':')) {
 442                 /* A tty with a colon is usually an X11 display, place
 443                  * there to show up in utmp. We rearrange things and
 444                  * don't pretend that an X display was a tty */
 445
 446                 if (isempty(display))
 447                         display = tty;
 448                 tty = "";
 449         } else if (streq(tty, "cron")) {
 450                 /* cron has been setting PAM_TTY to "cron" for a very long time
 451                  * and it cannot stop doing that for compatibility reasons. */
 452                 tty = "";
 453         }
 454
 455         if (!isempty(cvtnr))
 456                 safe_atou32(cvtnr, &vtnr);
 457
 458         if (!isempty(display) && vtnr <= 0) {
 459                 if (isempty(seat))
 460                         get_seat_from_display(display, &seat, &vtnr);
 461                 else if (streq(seat, "seat0"))
 462                         get_seat_from_display(display, NULL, &vtnr);
 463         }
 464
 465         type = !isempty(display) ? "x11" :
 466                    !isempty(tty) ? "tty" : "unspecified";
 467
 468         class = pam_getenv(handle, "XDG_SESSION_CLASS");
 469         if (isempty(class))
 470                 class = "user";
 471
 472         remote = !isempty(remote_host) &&
 473                 !streq(remote_host, "localhost") &&
 474                 !streq(remote_host, "localhost.localdomain");
 475
 476         if (!dbus_message_append_args(m,
 477                                       DBUS_TYPE_UINT32, &uid,
 478                                       DBUS_TYPE_UINT32, &pid,
 479                                       DBUS_TYPE_STRING, &service,
 480                                       DBUS_TYPE_STRING, &type,
 481                                       DBUS_TYPE_STRING, &class,
 482                                       DBUS_TYPE_STRING, &seat,
 483                                       DBUS_TYPE_UINT32, &vtnr,
 484                                       DBUS_TYPE_STRING, &tty,
 485                                       DBUS_TYPE_STRING, &display,
 486                                       DBUS_TYPE_BOOLEAN, &remote,
 487                                       DBUS_TYPE_STRING, &remote_user,
 488                                       DBUS_TYPE_STRING, &remote_host,
 489                                       DBUS_TYPE_INVALID)) {
 490                 pam_syslog(handle, LOG_ERR, "Could not attach parameters to message.");
 491                 r = PAM_BUF_ERR;
 492                 goto finish;
 493         }
 494
 495         dbus_message_iter_init_append(m, &iter);
 496
 497         r = bus_append_strv_iter(&iter, controllers);
 498         if (r < 0) {
 499                 pam_syslog(handle, LOG_ERR, "Could not attach parameter to message.");
 500                 r = PAM_BUF_ERR;
 501                 goto finish;
 502         }
 503
 504         r = bus_append_strv_iter(&iter, reset_controllers);
 505         if (r < 0) {
 506                 pam_syslog(handle, LOG_ERR, "Could not attach parameter to message.");
 507                 r = PAM_BUF_ERR;
 508                 goto finish;
 509         }
 510
 511         kp = kill_processes;
 512         if (!dbus_message_iter_append_basic(&iter, DBUS_TYPE_BOOLEAN, &kp)) {
 513                 pam_syslog(handle, LOG_ERR, "Could not attach parameter to message.");
 514                 r = PAM_BUF_ERR;
 515                 goto finish;
 516         }
 517
 518         if (debug)
 519                 pam_syslog(handle, LOG_DEBUG, "Asking logind to create session: "
 520                            "uid=%u pid=%u service=%s type=%s class=%s seat=%s vtnr=%u tty=%s display=%s remote=%s remote_user=%s remote_host=%s",
 521                            uid, pid, service, type, class, seat, vtnr, tty, display, yes_no(remote), remote_user, remote_host);
 522
 523         reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error);
 524         if (!reply) {
 525                 pam_syslog(handle, LOG_ERR, "Failed to create session: %s", bus_error_message(&error));
 526                 r = PAM_SESSION_ERR;
 527                 goto finish;
 528         }
 529
 530         if (!dbus_message_get_args(reply, &error,
 531                                    DBUS_TYPE_STRING, &id,
 532                                    DBUS_TYPE_OBJECT_PATH, &object_path,
 533                                    DBUS_TYPE_STRING, &runtime_path,
 534                                    DBUS_TYPE_UNIX_FD, &session_fd,
 535                                    DBUS_TYPE_STRING, &seat,
 536                                    DBUS_TYPE_UINT32, &vtnr,
 537                                    DBUS_TYPE_INVALID)) {
 538                 pam_syslog(handle, LOG_ERR, "Failed to parse message: %s", bus_error_message(&error));
 539                 r = PAM_SESSION_ERR;
 540                 goto finish;
 541         }
 542
 543         if (debug)
 544                 pam_syslog(handle, LOG_DEBUG, "Reply from logind: "
 545                            "id=%s object_path=%s runtime_path=%s session_fd=%d seat=%s vtnr=%u",
 546                            id, object_path, runtime_path, session_fd, seat, vtnr);
 547
 548         r = pam_misc_setenv(handle, "XDG_SESSION_ID", id, 0);
 549         if (r != PAM_SUCCESS) {
 550                 pam_syslog(handle, LOG_ERR, "Failed to set session id.");
 551                 goto finish;
 552         }
 553
 554         r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", runtime_path, 0);
 555         if (r != PAM_SUCCESS) {
 556                 pam_syslog(handle, LOG_ERR, "Failed to set runtime dir.");
 557                 goto finish;
 558         }
 559
 560         if (!isempty(seat)) {
 561                 r = pam_misc_setenv(handle, "XDG_SEAT", seat, 0);
 562                 if (r != PAM_SUCCESS) {
 563                         pam_syslog(handle, LOG_ERR, "Failed to set seat.");
 564                         goto finish;
 565                 }
 566         }
 567
 568         if (vtnr > 0) {
 569                 char buf[11];
 570                 snprintf(buf, sizeof(buf), "%u", vtnr);
 571                 char_array_0(buf);
 572
 573                 r = pam_misc_setenv(handle, "XDG_VTNR", buf, 0);
 574                 if (r != PAM_SUCCESS) {
 575                         pam_syslog(handle, LOG_ERR, "Failed to set virtual terminal number.");
 576                         goto finish;
 577                 }
 578         }
 579
 580         if (session_fd >= 0) {
 581                 r = pam_set_data(handle, "systemd.session-fd", INT_TO_PTR(session_fd+1), NULL);
 582                 if (r != PAM_SUCCESS) {
 583                         pam_syslog(handle, LOG_ERR, "Failed to install session fd.");
 584                         return r;
 585                 }
 586         }
 587
 588         session_fd = -1;
 589
 590         r = PAM_SUCCESS;
 591
 592 finish:
 593         strv_free(controllers);
 594         strv_free(reset_controllers);
 595         strv_free(kill_only_users);
 596         strv_free(kill_exclude_users);
 597
 598         dbus_error_free(&error);
 599
 600         if (bus) {
 601                 dbus_connection_close(bus);
 602                 dbus_connection_unref(bus);
 603         }
 604
 605         if (m)
 606                 dbus_message_unref(m);
 607
 608         if (reply)
 609                 dbus_message_unref(reply);
 610
 611         if (session_fd >= 0)
 612                 close_nointr_nofail(session_fd);
 613
 614         return r;
 615 }
 616
 617 _public_ PAM_EXTERN int pam_sm_close_session(
 618                 pam_handle_t *handle,
 619                 int flags,
 620                 int argc, const char **argv) {
 621
 622         const void *p = NULL;
 623         const char *id;
 624         DBusConnection *bus = NULL;
 625         DBusMessage *m = NULL, *reply = NULL;
 626         DBusError error;
 627         int r;
 628
 629         assert(handle);
 630
 631         dbus_error_init(&error);
 632
 633         id = pam_getenv(handle, "XDG_SESSION_ID");
 634         if (id) {
 635
 636                 /* Before we go and close the FIFO we need to tell
 637                  * logind that this is a clean session shutdown, so
 638                  * that it doesn't just go and slaughter us
 639                  * immediately after closing the fd */
 640
 641                 bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
 642                 if (!bus) {
 643                         pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", bus_error_message(&error));
 644                         r = PAM_SESSION_ERR;
 645                         goto finish;
 646                 }
 647
 648                 m = dbus_message_new_method_call(
 649                                 "org.freedesktop.login1",
 650                                 "/org/freedesktop/login1",
 651                                 "org.freedesktop.login1.Manager",
 652                                 "ReleaseSession");
 653                 if (!m) {
 654                         pam_syslog(handle, LOG_ERR, "Could not allocate release session message.");
 655                         r = PAM_BUF_ERR;
 656                         goto finish;
 657                 }
 658
 659                 if (!dbus_message_append_args(m,
 660                                               DBUS_TYPE_STRING, &id,
 661                                               DBUS_TYPE_INVALID)) {
 662                         pam_syslog(handle, LOG_ERR, "Could not attach parameters to message.");
 663                         r = PAM_BUF_ERR;
 664                         goto finish;
 665                 }
 666
 667                 reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error);
 668                 if (!reply) {
 669                         pam_syslog(handle, LOG_ERR, "Failed to release session: %s", bus_error_message(&error));
 670                         r = PAM_SESSION_ERR;
 671                         goto finish;
 672                 }
 673         }
 674
 675         r = PAM_SUCCESS;
 676
 677 finish:
 678         pam_get_data(handle, "systemd.session-fd", &p);
 679         if (p)
 680                 close_nointr(PTR_TO_INT(p) - 1);
 681
 682         dbus_error_free(&error);
 683
 684         if (bus) {
 685                 dbus_connection_close(bus);
 686                 dbus_connection_unref(bus);
 687         }
 688
 689         if (m)
 690                 dbus_message_unref(m);
 691
 692         if (reply)
 693                 dbus_message_unref(reply);
 694
 695         return r;
 696 }