src/libsystemd/sd-bus/bus-control.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #if HAVE_VALGRIND_MEMCHECK_H
   4 #include <valgrind/memcheck.h>
   5 #endif
   6
   7 #include <errno.h>
   8 #include <stddef.h>
   9
  10 #include "sd-bus.h"
  11
  12 #include "alloc-util.h"
  13 #include "bus-control.h"
  14 #include "bus-internal.h"
  15 #include "bus-message.h"
  16 #include "capability-util.h"
  17 #include "process-util.h"
  18 #include "stdio-util.h"
  19 #include "string-util.h"
  20 #include "strv.h"
  21 #include "user-util.h"
  22
  23 _public_ int sd_bus_get_unique_name(sd_bus *bus, const char **unique) {
  24         int r;
  25
  26         assert_return(bus, -EINVAL);
  27         assert_return(bus = bus_resolve(bus), -ENOPKG);
  28         assert_return(unique, -EINVAL);
  29         assert_return(!bus_pid_changed(bus), -ECHILD);
  30
  31         if (!bus->bus_client)
  32                 return -EINVAL;
  33
  34         r = bus_ensure_running(bus);
  35         if (r < 0)
  36                 return r;
  37
  38         *unique = bus->unique_name;
  39         return 0;
  40 }
  41
  42 static int validate_request_name_parameters(
  43                 sd_bus *bus,
  44                 const char *name,
  45                 uint64_t flags,
  46                 uint32_t *ret_param) {
  47
  48         uint32_t param = 0;
  49
  50         assert(bus);
  51         assert(name);
  52         assert(ret_param);
  53
  54         assert_return(!(flags & ~(SD_BUS_NAME_ALLOW_REPLACEMENT|SD_BUS_NAME_REPLACE_EXISTING|SD_BUS_NAME_QUEUE)), -EINVAL);
  55         assert_return(service_name_is_valid(name), -EINVAL);
  56         assert_return(name[0] != ':', -EINVAL);
  57
  58         if (!bus->bus_client)
  59                 return -EINVAL;
  60
  61         /* Don't allow requesting the special driver and local names */
  62         if (STR_IN_SET(name, "org.freedesktop.DBus", "org.freedesktop.DBus.Local"))
  63                 return -EINVAL;
  64
  65         if (!BUS_IS_OPEN(bus->state))
  66                 return -ENOTCONN;
  67
  68         if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT)
  69                 param |= BUS_NAME_ALLOW_REPLACEMENT;
  70         if (flags & SD_BUS_NAME_REPLACE_EXISTING)
  71                 param |= BUS_NAME_REPLACE_EXISTING;
  72         if (!(flags & SD_BUS_NAME_QUEUE))
  73                 param |= BUS_NAME_DO_NOT_QUEUE;
  74
  75         *ret_param = param;
  76
  77         return 0;
  78 }
  79
  80 _public_ int sd_bus_request_name(
  81                 sd_bus *bus,
  82                 const char *name,
  83                 uint64_t flags) {
  84
  85         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
  86         uint32_t ret, param = 0;
  87         int r;
  88
  89         assert_return(bus, -EINVAL);
  90         assert_return(bus = bus_resolve(bus), -ENOPKG);
  91         assert_return(name, -EINVAL);
  92         assert_return(!bus_pid_changed(bus), -ECHILD);
  93
  94         r = validate_request_name_parameters(bus, name, flags, &param);
  95         if (r < 0)
  96                 return r;
  97
  98         r = sd_bus_call_method(
  99                         bus,
 100                         "org.freedesktop.DBus",
 101                         "/org/freedesktop/DBus",
 102                         "org.freedesktop.DBus",
 103                         "RequestName",
 104                         NULL,
 105                         &reply,
 106                         "su",
 107                         name,
 108                         param);
 109         if (r < 0)
 110                 return r;
 111
 112         r = sd_bus_message_read(reply, "u", &ret);
 113         if (r < 0)
 114                 return r;
 115
 116         switch (ret) {
 117
 118         case BUS_NAME_ALREADY_OWNER:
 119                 return -EALREADY;
 120
 121         case BUS_NAME_EXISTS:
 122                 return -EEXIST;
 123
 124         case BUS_NAME_IN_QUEUE:
 125                 return 0;
 126
 127         case BUS_NAME_PRIMARY_OWNER:
 128                 return 1;
 129         }
 130
 131         return -EIO;
 132 }
 133
 134 static int default_request_name_handler(
 135                 sd_bus_message *m,
 136                 void *userdata,
 137                 sd_bus_error *ret_error) {
 138
 139         uint32_t ret;
 140         int r;
 141
 142         assert(m);
 143
 144         if (sd_bus_message_is_method_error(m, NULL)) {
 145                 log_debug_errno(sd_bus_message_get_errno(m),
 146                                 "Unable to request name, failing connection: %s",
 147                                 sd_bus_message_get_error(m)->message);
 148
 149                 bus_enter_closing(sd_bus_message_get_bus(m));
 150                 return 1;
 151         }
 152
 153         r = sd_bus_message_read(m, "u", &ret);
 154         if (r < 0)
 155                 return r;
 156
 157         switch (ret) {
 158
 159         case BUS_NAME_ALREADY_OWNER:
 160                 log_debug("Already owner of requested service name, ignoring.");
 161                 return 1;
 162
 163         case BUS_NAME_IN_QUEUE:
 164                 log_debug("In queue for requested service name.");
 165                 return 1;
 166
 167         case BUS_NAME_PRIMARY_OWNER:
 168                 log_debug("Successfully acquired requested service name.");
 169                 return 1;
 170
 171         case BUS_NAME_EXISTS:
 172                 log_debug("Requested service name already owned, failing connection.");
 173                 bus_enter_closing(sd_bus_message_get_bus(m));
 174                 return 1;
 175         }
 176
 177         log_debug("Unexpected response from RequestName(), failing connection.");
 178         bus_enter_closing(sd_bus_message_get_bus(m));
 179         return 1;
 180 }
 181
 182 _public_ int sd_bus_request_name_async(
 183                 sd_bus *bus,
 184                 sd_bus_slot **ret_slot,
 185                 const char *name,
 186                 uint64_t flags,
 187                 sd_bus_message_handler_t callback,
 188                 void *userdata) {
 189
 190         uint32_t param = 0;
 191         int r;
 192
 193         assert_return(bus, -EINVAL);
 194         assert_return(bus = bus_resolve(bus), -ENOPKG);
 195         assert_return(name, -EINVAL);
 196         assert_return(!bus_pid_changed(bus), -ECHILD);
 197
 198         r = validate_request_name_parameters(bus, name, flags, &param);
 199         if (r < 0)
 200                 return r;
 201
 202         return sd_bus_call_method_async(
 203                         bus,
 204                         ret_slot,
 205                         "org.freedesktop.DBus",
 206                         "/org/freedesktop/DBus",
 207                         "org.freedesktop.DBus",
 208                         "RequestName",
 209                         callback ?: default_request_name_handler,
 210                         userdata,
 211                         "su",
 212                         name,
 213                         param);
 214 }
 215
 216 static int validate_release_name_parameters(
 217                 sd_bus *bus,
 218                 const char *name) {
 219
 220         assert(bus);
 221         assert(name);
 222
 223         assert_return(service_name_is_valid(name), -EINVAL);
 224         assert_return(name[0] != ':', -EINVAL);
 225
 226         if (!bus->bus_client)
 227                 return -EINVAL;
 228
 229         /* Don't allow releasing the special driver and local names */
 230         if (STR_IN_SET(name, "org.freedesktop.DBus", "org.freedesktop.DBus.Local"))
 231                 return -EINVAL;
 232
 233         if (!BUS_IS_OPEN(bus->state))
 234                 return -ENOTCONN;
 235
 236         return 0;
 237 }
 238
 239 _public_ int sd_bus_release_name(
 240                 sd_bus *bus,
 241                 const char *name) {
 242
 243         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
 244         uint32_t ret;
 245         int r;
 246
 247         assert_return(bus, -EINVAL);
 248         assert_return(bus = bus_resolve(bus), -ENOPKG);
 249         assert_return(name, -EINVAL);
 250         assert_return(!bus_pid_changed(bus), -ECHILD);
 251
 252         r = validate_release_name_parameters(bus, name);
 253         if (r < 0)
 254                 return r;
 255
 256         r = sd_bus_call_method(
 257                         bus,
 258                         "org.freedesktop.DBus",
 259                         "/org/freedesktop/DBus",
 260                         "org.freedesktop.DBus",
 261                         "ReleaseName",
 262                         NULL,
 263                         &reply,
 264                         "s",
 265                         name);
 266         if (r < 0)
 267                 return r;
 268
 269         r = sd_bus_message_read(reply, "u", &ret);
 270         if (r < 0)
 271                 return r;
 272
 273         switch (ret) {
 274
 275         case BUS_NAME_NON_EXISTENT:
 276                 return -ESRCH;
 277
 278         case BUS_NAME_NOT_OWNER:
 279                 return -EADDRINUSE;
 280
 281         case BUS_NAME_RELEASED:
 282                 return 0;
 283         }
 284
 285         return -EIO;
 286 }
 287
 288 static int default_release_name_handler(
 289                 sd_bus_message *m,
 290                 void *userdata,
 291                 sd_bus_error *ret_error) {
 292
 293         uint32_t ret;
 294         int r;
 295
 296         assert(m);
 297
 298         if (sd_bus_message_is_method_error(m, NULL)) {
 299                 log_debug_errno(sd_bus_message_get_errno(m),
 300                                 "Unable to release name, failing connection: %s",
 301                                 sd_bus_message_get_error(m)->message);
 302
 303                 bus_enter_closing(sd_bus_message_get_bus(m));
 304                 return 1;
 305         }
 306
 307         r = sd_bus_message_read(m, "u", &ret);
 308         if (r < 0)
 309                 return r;
 310
 311         switch (ret) {
 312
 313         case BUS_NAME_NON_EXISTENT:
 314                 log_debug("Name asked to release is not taken currently, ignoring.");
 315                 return 1;
 316
 317         case BUS_NAME_NOT_OWNER:
 318                 log_debug("Name asked to release is owned by somebody else, ignoring.");
 319                 return 1;
 320
 321         case BUS_NAME_RELEASED:
 322                 log_debug("Name successfully released.");
 323                 return 1;
 324         }
 325
 326         log_debug("Unexpected response from ReleaseName(), failing connection.");
 327         bus_enter_closing(sd_bus_message_get_bus(m));
 328         return 1;
 329 }
 330
 331 _public_ int sd_bus_release_name_async(
 332                 sd_bus *bus,
 333                 sd_bus_slot **ret_slot,
 334                 const char *name,
 335                 sd_bus_message_handler_t callback,
 336                 void *userdata) {
 337
 338         int r;
 339
 340         assert_return(bus, -EINVAL);
 341         assert_return(bus = bus_resolve(bus), -ENOPKG);
 342         assert_return(name, -EINVAL);
 343         assert_return(!bus_pid_changed(bus), -ECHILD);
 344
 345         r = validate_release_name_parameters(bus, name);
 346         if (r < 0)
 347                 return r;
 348
 349         return sd_bus_call_method_async(
 350                         bus,
 351                         ret_slot,
 352                         "org.freedesktop.DBus",
 353                         "/org/freedesktop/DBus",
 354                         "org.freedesktop.DBus",
 355                         "ReleaseName",
 356                         callback ?: default_release_name_handler,
 357                         userdata,
 358                         "s",
 359                         name);
 360 }
 361
 362 _public_ int sd_bus_list_names(sd_bus *bus, char ***acquired, char ***activatable) {
 363         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
 364         _cleanup_strv_free_ char **x = NULL, **y = NULL;
 365         int r;
 366
 367         assert_return(bus, -EINVAL);
 368         assert_return(bus = bus_resolve(bus), -ENOPKG);
 369         assert_return(acquired || activatable, -EINVAL);
 370         assert_return(!bus_pid_changed(bus), -ECHILD);
 371
 372         if (!bus->bus_client)
 373                 return -EINVAL;
 374
 375         if (!BUS_IS_OPEN(bus->state))
 376                 return -ENOTCONN;
 377
 378         if (acquired) {
 379                 r = sd_bus_call_method(
 380                                 bus,
 381                                 "org.freedesktop.DBus",
 382                                 "/org/freedesktop/DBus",
 383                                 "org.freedesktop.DBus",
 384                                 "ListNames",
 385                                 NULL,
 386                                 &reply,
 387                                 NULL);
 388                 if (r < 0)
 389                         return r;
 390
 391                 r = sd_bus_message_read_strv(reply, &x);
 392                 if (r < 0)
 393                         return r;
 394
 395                 reply = sd_bus_message_unref(reply);
 396         }
 397
 398         if (activatable) {
 399                 r = sd_bus_call_method(
 400                                 bus,
 401                                 "org.freedesktop.DBus",
 402                                 "/org/freedesktop/DBus",
 403                                 "org.freedesktop.DBus",
 404                                 "ListActivatableNames",
 405                                 NULL,
 406                                 &reply,
 407                                 NULL);
 408                 if (r < 0)
 409                         return r;
 410
 411                 r = sd_bus_message_read_strv(reply, &y);
 412                 if (r < 0)
 413                         return r;
 414
 415                 *activatable = TAKE_PTR(y);
 416         }
 417
 418         if (acquired)
 419                 *acquired = TAKE_PTR(x);
 420
 421         return 0;
 422 }
 423
 424 _public_ int sd_bus_get_name_creds(
 425                 sd_bus *bus,
 426                 const char *name,
 427                 uint64_t mask,
 428                 sd_bus_creds **creds) {
 429
 430         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply_unique = NULL, *reply = NULL;
 431         _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *c = NULL;
 432         const char *unique;
 433         pid_t pid = 0;
 434         int r;
 435
 436         assert_return(bus, -EINVAL);
 437         assert_return(bus = bus_resolve(bus), -ENOPKG);
 438         assert_return(name, -EINVAL);
 439         assert_return((mask & ~SD_BUS_CREDS_AUGMENT) <= _SD_BUS_CREDS_ALL, -EOPNOTSUPP);
 440         assert_return(mask == 0 || creds, -EINVAL);
 441         assert_return(!bus_pid_changed(bus), -ECHILD);
 442         assert_return(service_name_is_valid(name), -EINVAL);
 443
 444         if (!bus->bus_client)
 445                 return -EINVAL;
 446
 447         /* Turn off augmenting if this isn't a local connection. If the connection is not local, then /proc is not
 448          * going to match. */
 449         if (!bus->is_local)
 450                 mask &= ~SD_BUS_CREDS_AUGMENT;
 451
 452         if (streq(name, "org.freedesktop.DBus.Local"))
 453                 return -EINVAL;
 454
 455         if (streq(name, "org.freedesktop.DBus"))
 456                 return sd_bus_get_owner_creds(bus, mask, creds);
 457
 458         if (!BUS_IS_OPEN(bus->state))
 459                 return -ENOTCONN;
 460
 461         /* If the name is unique anyway, we can use it directly */
 462         unique = name[0] == ':' ? name : NULL;
 463
 464         /* Only query the owner if the caller wants to know it and the name is not unique anyway, or if the caller just
 465          * wants to check whether a name exists */
 466         if ((FLAGS_SET(mask, SD_BUS_CREDS_UNIQUE_NAME) && !unique) || mask == 0) {
 467                 r = sd_bus_call_method(
 468                                 bus,
 469                                 "org.freedesktop.DBus",
 470                                 "/org/freedesktop/DBus",
 471                                 "org.freedesktop.DBus",
 472                                 "GetNameOwner",
 473                                 NULL,
 474                                 &reply_unique,
 475                                 "s",
 476                                 name);
 477                 if (r < 0)
 478                         return r;
 479
 480                 r = sd_bus_message_read(reply_unique, "s", &unique);
 481                 if (r < 0)
 482                         return r;
 483         }
 484
 485         if (mask != 0) {
 486                 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 487                 bool need_pid, need_uid, need_selinux, need_separate_calls;
 488
 489                 c = bus_creds_new();
 490                 if (!c)
 491                         return -ENOMEM;
 492
 493                 if ((mask & SD_BUS_CREDS_UNIQUE_NAME) && unique) {
 494                         c->unique_name = strdup(unique);
 495                         if (!c->unique_name)
 496                                 return -ENOMEM;
 497
 498                         c->mask |= SD_BUS_CREDS_UNIQUE_NAME;
 499                 }
 500
 501                 need_pid = (mask & SD_BUS_CREDS_PID) ||
 502                         ((mask & SD_BUS_CREDS_AUGMENT) &&
 503                          (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID|
 504                                   SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID|
 505                                   SD_BUS_CREDS_SUPPLEMENTARY_GIDS|
 506                                   SD_BUS_CREDS_COMM|SD_BUS_CREDS_EXE|SD_BUS_CREDS_CMDLINE|
 507                                   SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_OWNER_UID|
 508                                   SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS|
 509                                   SD_BUS_CREDS_SELINUX_CONTEXT|
 510                                   SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)));
 511                 need_uid = mask & SD_BUS_CREDS_EUID;
 512                 need_selinux = mask & SD_BUS_CREDS_SELINUX_CONTEXT;
 513
 514                 if (need_pid + need_uid + need_selinux > 1) {
 515
 516                         /* If we need more than one of the credentials, then use GetConnectionCredentials() */
 517
 518                         r = sd_bus_call_method(
 519                                         bus,
 520                                         "org.freedesktop.DBus",
 521                                         "/org/freedesktop/DBus",
 522                                         "org.freedesktop.DBus",
 523                                         "GetConnectionCredentials",
 524                                         &error,
 525                                         &reply,
 526                                         "s",
 527                                         unique ?: name);
 528
 529                         if (r < 0) {
 530
 531                                 if (!sd_bus_error_has_name(&error, SD_BUS_ERROR_UNKNOWN_METHOD))
 532                                         return r;
 533
 534                                 /* If we got an unknown method error, fall back to the individual calls... */
 535                                 need_separate_calls = true;
 536                                 sd_bus_error_free(&error);
 537
 538                         } else {
 539                                 need_separate_calls = false;
 540
 541                                 r = sd_bus_message_enter_container(reply, 'a', "{sv}");
 542                                 if (r < 0)
 543                                         return r;
 544
 545                                 for (;;) {
 546                                         const char *m;
 547
 548                                         r = sd_bus_message_enter_container(reply, 'e', "sv");
 549                                         if (r < 0)
 550                                                 return r;
 551                                         if (r == 0)
 552                                                 break;
 553
 554                                         r = sd_bus_message_read(reply, "s", &m);
 555                                         if (r < 0)
 556                                                 return r;
 557
 558                                         if (need_uid && streq(m, "UnixUserID")) {
 559                                                 uint32_t u;
 560
 561                                                 r = sd_bus_message_read(reply, "v", "u", &u);
 562                                                 if (r < 0)
 563                                                         return r;
 564
 565                                                 c->euid = u;
 566                                                 c->mask |= SD_BUS_CREDS_EUID;
 567
 568                                         } else if (need_pid && streq(m, "ProcessID")) {
 569                                                 uint32_t p;
 570
 571                                                 r = sd_bus_message_read(reply, "v", "u", &p);
 572                                                 if (r < 0)
 573                                                         return r;
 574
 575                                                 pid = p;
 576                                                 if (mask & SD_BUS_CREDS_PID) {
 577                                                         c->pid = p;
 578                                                         c->mask |= SD_BUS_CREDS_PID;
 579                                                 }
 580
 581                                         } else if (need_selinux && streq(m, "LinuxSecurityLabel")) {
 582                                                 const void *p = NULL;
 583                                                 size_t sz = 0;
 584
 585                                                 r = sd_bus_message_enter_container(reply, 'v', "ay");
 586                                                 if (r < 0)
 587                                                         return r;
 588
 589                                                 r = sd_bus_message_read_array(reply, 'y', &p, &sz);
 590                                                 if (r < 0)
 591                                                         return r;
 592
 593                                                 free(c->label);
 594                                                 c->label = strndup(p, sz);
 595                                                 if (!c->label)
 596                                                         return -ENOMEM;
 597
 598                                                 c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
 599
 600                                                 r = sd_bus_message_exit_container(reply);
 601                                                 if (r < 0)
 602                                                         return r;
 603                                         } else {
 604                                                 r = sd_bus_message_skip(reply, "v");
 605                                                 if (r < 0)
 606                                                         return r;
 607                                         }
 608
 609                                         r = sd_bus_message_exit_container(reply);
 610                                         if (r < 0)
 611                                                 return r;
 612                                 }
 613
 614                                 r = sd_bus_message_exit_container(reply);
 615                                 if (r < 0)
 616                                         return r;
 617
 618                                 if (need_pid && pid == 0)
 619                                         return -EPROTO;
 620                         }
 621
 622                 } else /* When we only need a single field, then let's use separate calls */
 623                         need_separate_calls = true;
 624
 625                 if (need_separate_calls) {
 626                         if (need_pid) {
 627                                 uint32_t u;
 628
 629                                 r = sd_bus_call_method(
 630                                                 bus,
 631                                                 "org.freedesktop.DBus",
 632                                                 "/org/freedesktop/DBus",
 633                                                 "org.freedesktop.DBus",
 634                                                 "GetConnectionUnixProcessID",
 635                                                 NULL,
 636                                                 &reply,
 637                                                 "s",
 638                                                 unique ?: name);
 639                                 if (r < 0)
 640                                         return r;
 641
 642                                 r = sd_bus_message_read(reply, "u", &u);
 643                                 if (r < 0)
 644                                         return r;
 645
 646                                 pid = u;
 647                                 if (mask & SD_BUS_CREDS_PID) {
 648                                         c->pid = u;
 649                                         c->mask |= SD_BUS_CREDS_PID;
 650                                 }
 651
 652                                 reply = sd_bus_message_unref(reply);
 653                         }
 654
 655                         if (need_uid) {
 656                                 uint32_t u;
 657
 658                                 r = sd_bus_call_method(
 659                                                 bus,
 660                                                 "org.freedesktop.DBus",
 661                                                 "/org/freedesktop/DBus",
 662                                                 "org.freedesktop.DBus",
 663                                                 "GetConnectionUnixUser",
 664                                                 NULL,
 665                                                 &reply,
 666                                                 "s",
 667                                                 unique ?: name);
 668                                 if (r < 0)
 669                                         return r;
 670
 671                                 r = sd_bus_message_read(reply, "u", &u);
 672                                 if (r < 0)
 673                                         return r;
 674
 675                                 c->euid = u;
 676                                 c->mask |= SD_BUS_CREDS_EUID;
 677
 678                                 reply = sd_bus_message_unref(reply);
 679                         }
 680
 681                         if (need_selinux) {
 682                                 const void *p = NULL;
 683                                 size_t sz = 0;
 684
 685                                 r = sd_bus_call_method(
 686                                                 bus,
 687                                                 "org.freedesktop.DBus",
 688                                                 "/org/freedesktop/DBus",
 689                                                 "org.freedesktop.DBus",
 690                                                 "GetConnectionSELinuxSecurityContext",
 691                                                 &error,
 692                                                 &reply,
 693                                                 "s",
 694                                                 unique ?: name);
 695                                 if (r < 0) {
 696                                         if (!sd_bus_error_has_name(&error, "org.freedesktop.DBus.Error.SELinuxSecurityContextUnknown"))
 697                                                 return r;
 698
 699                                         /* no data is fine */
 700                                 } else {
 701                                         r = sd_bus_message_read_array(reply, 'y', &p, &sz);
 702                                         if (r < 0)
 703                                                 return r;
 704
 705                                         c->label = memdup_suffix0(p, sz);
 706                                         if (!c->label)
 707                                                 return -ENOMEM;
 708
 709                                         c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
 710                                 }
 711                         }
 712                 }
 713
 714                 r = bus_creds_add_more(c, mask, pid, 0);
 715                 if (r < 0 && r != -ESRCH) /* Return the error, but ignore ESRCH which just means the process is already gone */
 716                         return r;
 717         }
 718
 719         if (creds)
 720                 *creds = TAKE_PTR(c);
 721
 722         return 0;
 723 }
 724
 725 _public_ int sd_bus_get_owner_creds(sd_bus *bus, uint64_t mask, sd_bus_creds **ret) {
 726         _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *c = NULL;
 727         bool do_label, do_groups;
 728         pid_t pid = 0;
 729         int r;
 730
 731         assert_return(bus, -EINVAL);
 732         assert_return(bus = bus_resolve(bus), -ENOPKG);
 733         assert_return((mask & ~SD_BUS_CREDS_AUGMENT) <= _SD_BUS_CREDS_ALL, -EOPNOTSUPP);
 734         assert_return(ret, -EINVAL);
 735         assert_return(!bus_pid_changed(bus), -ECHILD);
 736
 737         if (!BUS_IS_OPEN(bus->state))
 738                 return -ENOTCONN;
 739
 740         if (!bus->is_local)
 741                 mask &= ~SD_BUS_CREDS_AUGMENT;
 742
 743         do_label = bus->label && (mask & SD_BUS_CREDS_SELINUX_CONTEXT);
 744         do_groups = bus->n_groups != (size_t) -1 && (mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS);
 745
 746         /* Avoid allocating anything if we have no chance of returning useful data */
 747         if (!bus->ucred_valid && !do_label && !do_groups)
 748                 return -ENODATA;
 749
 750         c = bus_creds_new();
 751         if (!c)
 752                 return -ENOMEM;
 753
 754         if (bus->ucred_valid) {
 755                 if (pid_is_valid(bus->ucred.pid)) {
 756                         pid = c->pid = bus->ucred.pid;
 757                         c->mask |= SD_BUS_CREDS_PID & mask;
 758                 }
 759
 760                 if (uid_is_valid(bus->ucred.uid)) {
 761                         c->euid = bus->ucred.uid;
 762                         c->mask |= SD_BUS_CREDS_EUID & mask;
 763                 }
 764
 765                 if (gid_is_valid(bus->ucred.gid)) {
 766                         c->egid = bus->ucred.gid;
 767                         c->mask |= SD_BUS_CREDS_EGID & mask;
 768                 }
 769         }
 770
 771         if (do_label) {
 772                 c->label = strdup(bus->label);
 773                 if (!c->label)
 774                         return -ENOMEM;
 775
 776                 c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
 777         }
 778
 779         if (do_groups) {
 780                 c->supplementary_gids = newdup(gid_t, bus->groups, bus->n_groups);
 781                 if (!c->supplementary_gids)
 782                         return -ENOMEM;
 783
 784                 c->n_supplementary_gids = bus->n_groups;
 785
 786                 c->mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS;
 787         }
 788
 789         r = bus_creds_add_more(c, mask, pid, 0);
 790         if (r < 0 && r != -ESRCH) /* If the process vanished, then don't complain, just return what we got */
 791                 return r;
 792
 793         *ret = TAKE_PTR(c);
 794
 795         return 0;
 796 }
 797
 798 #define append_eavesdrop(bus, m)                                        \
 799         ((bus)->is_monitor                                              \
 800          ? (isempty(m) ? "eavesdrop='true'" : strjoina((m), ",eavesdrop='true'")) \
 801          : (m))
 802
 803 int bus_add_match_internal(
 804                 sd_bus *bus,
 805                 const char *match,
 806                 uint64_t *ret_counter) {
 807
 808         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
 809         const char *e;
 810         int r;
 811
 812         assert(bus);
 813
 814         if (!bus->bus_client)
 815                 return -EINVAL;
 816
 817         e = append_eavesdrop(bus, match);
 818
 819         r = sd_bus_call_method(
 820                         bus,
 821                         "org.freedesktop.DBus",
 822                         "/org/freedesktop/DBus",
 823                         "org.freedesktop.DBus",
 824                         "AddMatch",
 825                         NULL,
 826                         &reply,
 827                         "s",
 828                         e);
 829         if (r < 0)
 830                 return r;
 831
 832         /* If the caller asked for it, return the read counter of the reply */
 833         if (ret_counter)
 834                 *ret_counter = reply->read_counter;
 835
 836         return r;
 837 }
 838
 839 int bus_add_match_internal_async(
 840                 sd_bus *bus,
 841                 sd_bus_slot **ret_slot,
 842                 const char *match,
 843                 sd_bus_message_handler_t callback,
 844                 void *userdata) {
 845
 846         const char *e;
 847
 848         assert(bus);
 849
 850         if (!bus->bus_client)
 851                 return -EINVAL;
 852
 853         e = append_eavesdrop(bus, match);
 854
 855         return sd_bus_call_method_async(
 856                         bus,
 857                         ret_slot,
 858                         "org.freedesktop.DBus",
 859                         "/org/freedesktop/DBus",
 860                         "org.freedesktop.DBus",
 861                         "AddMatch",
 862                         callback,
 863                         userdata,
 864                         "s",
 865                         e);
 866 }
 867
 868 int bus_remove_match_internal(
 869                 sd_bus *bus,
 870                 const char *match) {
 871
 872         const char *e;
 873
 874         assert(bus);
 875         assert(match);
 876
 877         if (!bus->bus_client)
 878                 return -EINVAL;
 879
 880         e = append_eavesdrop(bus, match);
 881
 882         /* Fire and forget */
 883
 884         return sd_bus_call_method_async(
 885                         bus,
 886                         NULL,
 887                         "org.freedesktop.DBus",
 888                         "/org/freedesktop/DBus",
 889                         "org.freedesktop.DBus",
 890                         "RemoveMatch",
 891                         NULL,
 892                         NULL,
 893                         "s",
 894                         e);
 895 }
 896
 897 _public_ int sd_bus_get_name_machine_id(sd_bus *bus, const char *name, sd_id128_t *machine) {
 898         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL, *m = NULL;
 899         const char *mid;
 900         int r;
 901
 902         assert_return(bus, -EINVAL);
 903         assert_return(bus = bus_resolve(bus), -ENOPKG);
 904         assert_return(name, -EINVAL);
 905         assert_return(machine, -EINVAL);
 906         assert_return(!bus_pid_changed(bus), -ECHILD);
 907         assert_return(service_name_is_valid(name), -EINVAL);
 908
 909         if (!bus->bus_client)
 910                 return -EINVAL;
 911
 912         if (!BUS_IS_OPEN(bus->state))
 913                 return -ENOTCONN;
 914
 915         if (streq_ptr(name, bus->unique_name))
 916                 return sd_id128_get_machine(machine);
 917
 918         r = sd_bus_message_new_method_call(
 919                         bus,
 920                         &m,
 921                         name,
 922                         "/",
 923                         "org.freedesktop.DBus.Peer",
 924                         "GetMachineId");
 925         if (r < 0)
 926                 return r;
 927
 928         r = sd_bus_message_set_auto_start(m, false);
 929         if (r < 0)
 930                 return r;
 931
 932         r = sd_bus_call(bus, m, 0, NULL, &reply);
 933         if (r < 0)
 934                 return r;
 935
 936         r = sd_bus_message_read(reply, "s", &mid);
 937         if (r < 0)
 938                 return r;
 939
 940         return sd_id128_from_string(mid, machine);
 941 }