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

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2013 Lennart Poettering
   6 ***/
   7
   8 #include <linux/capability.h>
   9 #include <stdlib.h>
  10
  11 #include "alloc-util.h"
  12 #include "audit-util.h"
  13 #include "bus-creds.h"
  14 #include "bus-label.h"
  15 #include "bus-message.h"
  16 #include "bus-util.h"
  17 #include "capability-util.h"
  18 #include "cgroup-util.h"
  19 #include "fd-util.h"
  20 #include "fileio.h"
  21 #include "format-util.h"
  22 #include "hexdecoct.h"
  23 #include "parse-util.h"
  24 #include "process-util.h"
  25 #include "string-util.h"
  26 #include "strv.h"
  27 #include "terminal-util.h"
  28 #include "user-util.h"
  29 #include "util.h"
  30
  31 enum {
  32         CAP_OFFSET_INHERITABLE = 0,
  33         CAP_OFFSET_PERMITTED = 1,
  34         CAP_OFFSET_EFFECTIVE = 2,
  35         CAP_OFFSET_BOUNDING = 3
  36 };
  37
  38 void bus_creds_done(sd_bus_creds *c) {
  39         assert(c);
  40
  41         /* For internal bus cred structures that are allocated by
  42          * something else */
  43
  44         free(c->session);
  45         free(c->unit);
  46         free(c->user_unit);
  47         free(c->slice);
  48         free(c->user_slice);
  49         free(c->unescaped_description);
  50         free(c->supplementary_gids);
  51         free(c->tty);
  52
  53         free(c->well_known_names); /* note that this is an strv, but
  54                                     * we only free the array, not the
  55                                     * strings the array points to. The
  56                                     * full strv we only free if
  57                                     * c->allocated is set, see
  58                                     * below. */
  59
  60         strv_free(c->cmdline_array);
  61 }
  62
  63 _public_ sd_bus_creds *sd_bus_creds_ref(sd_bus_creds *c) {
  64
  65         if (!c)
  66                 return NULL;
  67
  68         if (c->allocated) {
  69                 assert(c->n_ref > 0);
  70                 c->n_ref++;
  71         } else {
  72                 sd_bus_message *m;
  73
  74                 /* If this is an embedded creds structure, then
  75                  * forward ref counting to the message */
  76                 m = container_of(c, sd_bus_message, creds);
  77                 sd_bus_message_ref(m);
  78         }
  79
  80         return c;
  81 }
  82
  83 _public_ sd_bus_creds *sd_bus_creds_unref(sd_bus_creds *c) {
  84
  85         if (!c)
  86                 return NULL;
  87
  88         if (c->allocated) {
  89                 assert(c->n_ref > 0);
  90                 c->n_ref--;
  91
  92                 if (c->n_ref == 0) {
  93                         free(c->comm);
  94                         free(c->tid_comm);
  95                         free(c->exe);
  96                         free(c->cmdline);
  97                         free(c->cgroup);
  98                         free(c->capability);
  99                         free(c->label);
 100                         free(c->unique_name);
 101                         free(c->cgroup_root);
 102                         free(c->description);
 103
 104                         c->supplementary_gids = mfree(c->supplementary_gids);
 105
 106                         c->well_known_names = strv_free(c->well_known_names);
 107
 108                         bus_creds_done(c);
 109
 110                         free(c);
 111                 }
 112         } else {
 113                 sd_bus_message *m;
 114
 115                 m = container_of(c, sd_bus_message, creds);
 116                 sd_bus_message_unref(m);
 117         }
 118
 119
 120         return NULL;
 121 }
 122
 123 _public_ uint64_t sd_bus_creds_get_mask(const sd_bus_creds *c) {
 124         assert_return(c, 0);
 125
 126         return c->mask;
 127 }
 128
 129 _public_ uint64_t sd_bus_creds_get_augmented_mask(const sd_bus_creds *c) {
 130         assert_return(c, 0);
 131
 132         return c->augmented;
 133 }
 134
 135 sd_bus_creds* bus_creds_new(void) {
 136         sd_bus_creds *c;
 137
 138         c = new0(sd_bus_creds, 1);
 139         if (!c)
 140                 return NULL;
 141
 142         c->allocated = true;
 143         c->n_ref = 1;
 144         return c;
 145 }
 146
 147 _public_ int sd_bus_creds_new_from_pid(sd_bus_creds **ret, pid_t pid, uint64_t mask) {
 148         sd_bus_creds *c;
 149         int r;
 150
 151         assert_return(pid >= 0, -EINVAL);
 152         assert_return(mask <= _SD_BUS_CREDS_ALL, -EOPNOTSUPP);
 153         assert_return(ret, -EINVAL);
 154
 155         if (pid == 0)
 156                 pid = getpid_cached();
 157
 158         c = bus_creds_new();
 159         if (!c)
 160                 return -ENOMEM;
 161
 162         r = bus_creds_add_more(c, mask | SD_BUS_CREDS_AUGMENT, pid, 0);
 163         if (r < 0) {
 164                 sd_bus_creds_unref(c);
 165                 return r;
 166         }
 167
 168         /* Check if the process existed at all, in case we haven't
 169          * figured that out already */
 170         if (!pid_is_alive(pid)) {
 171                 sd_bus_creds_unref(c);
 172                 return -ESRCH;
 173         }
 174
 175         *ret = c;
 176         return 0;
 177 }
 178
 179 _public_ int sd_bus_creds_get_uid(sd_bus_creds *c, uid_t *uid) {
 180         assert_return(c, -EINVAL);
 181         assert_return(uid, -EINVAL);
 182
 183         if (!(c->mask & SD_BUS_CREDS_UID))
 184                 return -ENODATA;
 185
 186         *uid = c->uid;
 187         return 0;
 188 }
 189
 190 _public_ int sd_bus_creds_get_euid(sd_bus_creds *c, uid_t *euid) {
 191         assert_return(c, -EINVAL);
 192         assert_return(euid, -EINVAL);
 193
 194         if (!(c->mask & SD_BUS_CREDS_EUID))
 195                 return -ENODATA;
 196
 197         *euid = c->euid;
 198         return 0;
 199 }
 200
 201 _public_ int sd_bus_creds_get_suid(sd_bus_creds *c, uid_t *suid) {
 202         assert_return(c, -EINVAL);
 203         assert_return(suid, -EINVAL);
 204
 205         if (!(c->mask & SD_BUS_CREDS_SUID))
 206                 return -ENODATA;
 207
 208         *suid = c->suid;
 209         return 0;
 210 }
 211
 212
 213 _public_ int sd_bus_creds_get_fsuid(sd_bus_creds *c, uid_t *fsuid) {
 214         assert_return(c, -EINVAL);
 215         assert_return(fsuid, -EINVAL);
 216
 217         if (!(c->mask & SD_BUS_CREDS_FSUID))
 218                 return -ENODATA;
 219
 220         *fsuid = c->fsuid;
 221         return 0;
 222 }
 223
 224 _public_ int sd_bus_creds_get_gid(sd_bus_creds *c, gid_t *gid) {
 225         assert_return(c, -EINVAL);
 226         assert_return(gid, -EINVAL);
 227
 228         if (!(c->mask & SD_BUS_CREDS_GID))
 229                 return -ENODATA;
 230
 231         *gid = c->gid;
 232         return 0;
 233 }
 234
 235 _public_ int sd_bus_creds_get_egid(sd_bus_creds *c, gid_t *egid) {
 236         assert_return(c, -EINVAL);
 237         assert_return(egid, -EINVAL);
 238
 239         if (!(c->mask & SD_BUS_CREDS_EGID))
 240                 return -ENODATA;
 241
 242         *egid = c->egid;
 243         return 0;
 244 }
 245
 246 _public_ int sd_bus_creds_get_sgid(sd_bus_creds *c, gid_t *sgid) {
 247         assert_return(c, -EINVAL);
 248         assert_return(sgid, -EINVAL);
 249
 250         if (!(c->mask & SD_BUS_CREDS_SGID))
 251                 return -ENODATA;
 252
 253         *sgid = c->sgid;
 254         return 0;
 255 }
 256
 257 _public_ int sd_bus_creds_get_fsgid(sd_bus_creds *c, gid_t *fsgid) {
 258         assert_return(c, -EINVAL);
 259         assert_return(fsgid, -EINVAL);
 260
 261         if (!(c->mask & SD_BUS_CREDS_FSGID))
 262                 return -ENODATA;
 263
 264         *fsgid = c->fsgid;
 265         return 0;
 266 }
 267
 268 _public_ int sd_bus_creds_get_supplementary_gids(sd_bus_creds *c, const gid_t **gids) {
 269         assert_return(c, -EINVAL);
 270         assert_return(gids, -EINVAL);
 271
 272         if (!(c->mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS))
 273                 return -ENODATA;
 274
 275         *gids = c->supplementary_gids;
 276         return (int) c->n_supplementary_gids;
 277 }
 278
 279 _public_ int sd_bus_creds_get_pid(sd_bus_creds *c, pid_t *pid) {
 280         assert_return(c, -EINVAL);
 281         assert_return(pid, -EINVAL);
 282
 283         if (!(c->mask & SD_BUS_CREDS_PID))
 284                 return -ENODATA;
 285
 286         assert(c->pid > 0);
 287         *pid = c->pid;
 288         return 0;
 289 }
 290
 291 _public_ int sd_bus_creds_get_ppid(sd_bus_creds *c, pid_t *ppid) {
 292         assert_return(c, -EINVAL);
 293         assert_return(ppid, -EINVAL);
 294
 295         if (!(c->mask & SD_BUS_CREDS_PPID))
 296                 return -ENODATA;
 297
 298         /* PID 1 has no parent process. Let's distinguish the case of
 299          * not knowing and not having a parent process by the returned
 300          * error code. */
 301         if (c->ppid == 0)
 302                 return -ENXIO;
 303
 304         *ppid = c->ppid;
 305         return 0;
 306 }
 307
 308 _public_ int sd_bus_creds_get_tid(sd_bus_creds *c, pid_t *tid) {
 309         assert_return(c, -EINVAL);
 310         assert_return(tid, -EINVAL);
 311
 312         if (!(c->mask & SD_BUS_CREDS_TID))
 313                 return -ENODATA;
 314
 315         assert(c->tid > 0);
 316         *tid = c->tid;
 317         return 0;
 318 }
 319
 320 _public_ int sd_bus_creds_get_selinux_context(sd_bus_creds *c, const char **ret) {
 321         assert_return(c, -EINVAL);
 322
 323         if (!(c->mask & SD_BUS_CREDS_SELINUX_CONTEXT))
 324                 return -ENODATA;
 325
 326         assert(c->label);
 327         *ret = c->label;
 328         return 0;
 329 }
 330
 331 _public_ int sd_bus_creds_get_comm(sd_bus_creds *c, const char **ret) {
 332         assert_return(c, -EINVAL);
 333         assert_return(ret, -EINVAL);
 334
 335         if (!(c->mask & SD_BUS_CREDS_COMM))
 336                 return -ENODATA;
 337
 338         assert(c->comm);
 339         *ret = c->comm;
 340         return 0;
 341 }
 342
 343 _public_ int sd_bus_creds_get_tid_comm(sd_bus_creds *c, const char **ret) {
 344         assert_return(c, -EINVAL);
 345         assert_return(ret, -EINVAL);
 346
 347         if (!(c->mask & SD_BUS_CREDS_TID_COMM))
 348                 return -ENODATA;
 349
 350         assert(c->tid_comm);
 351         *ret = c->tid_comm;
 352         return 0;
 353 }
 354
 355 _public_ int sd_bus_creds_get_exe(sd_bus_creds *c, const char **ret) {
 356         assert_return(c, -EINVAL);
 357         assert_return(ret, -EINVAL);
 358
 359         if (!(c->mask & SD_BUS_CREDS_EXE))
 360                 return -ENODATA;
 361
 362         if (!c->exe)
 363                 return -ENXIO;
 364
 365         *ret = c->exe;
 366         return 0;
 367 }
 368
 369 _public_ int sd_bus_creds_get_cgroup(sd_bus_creds *c, const char **ret) {
 370         assert_return(c, -EINVAL);
 371         assert_return(ret, -EINVAL);
 372
 373         if (!(c->mask & SD_BUS_CREDS_CGROUP))
 374                 return -ENODATA;
 375
 376         assert(c->cgroup);
 377         *ret = c->cgroup;
 378         return 0;
 379 }
 380
 381 _public_ int sd_bus_creds_get_unit(sd_bus_creds *c, const char **ret) {
 382         int r;
 383
 384         assert_return(c, -EINVAL);
 385         assert_return(ret, -EINVAL);
 386
 387         if (!(c->mask & SD_BUS_CREDS_UNIT))
 388                 return -ENODATA;
 389
 390         assert(c->cgroup);
 391
 392         if (!c->unit) {
 393                 const char *shifted;
 394
 395                 r = cg_shift_path(c->cgroup, c->cgroup_root, &shifted);
 396                 if (r < 0)
 397                         return r;
 398
 399                 r = cg_path_get_unit(shifted, (char**) &c->unit);
 400                 if (r < 0)
 401                         return r;
 402         }
 403
 404         *ret = c->unit;
 405         return 0;
 406 }
 407
 408 _public_ int sd_bus_creds_get_user_unit(sd_bus_creds *c, const char **ret) {
 409         int r;
 410
 411         assert_return(c, -EINVAL);
 412         assert_return(ret, -EINVAL);
 413
 414         if (!(c->mask & SD_BUS_CREDS_USER_UNIT))
 415                 return -ENODATA;
 416
 417         assert(c->cgroup);
 418
 419         if (!c->user_unit) {
 420                 const char *shifted;
 421
 422                 r = cg_shift_path(c->cgroup, c->cgroup_root, &shifted);
 423                 if (r < 0)
 424                         return r;
 425
 426                 r = cg_path_get_user_unit(shifted, (char**) &c->user_unit);
 427                 if (r < 0)
 428                         return r;
 429         }
 430
 431         *ret = c->user_unit;
 432         return 0;
 433 }
 434
 435 _public_ int sd_bus_creds_get_slice(sd_bus_creds *c, const char **ret) {
 436         int r;
 437
 438         assert_return(c, -EINVAL);
 439         assert_return(ret, -EINVAL);
 440
 441         if (!(c->mask & SD_BUS_CREDS_SLICE))
 442                 return -ENODATA;
 443
 444         assert(c->cgroup);
 445
 446         if (!c->slice) {
 447                 const char *shifted;
 448
 449                 r = cg_shift_path(c->cgroup, c->cgroup_root, &shifted);
 450                 if (r < 0)
 451                         return r;
 452
 453                 r = cg_path_get_slice(shifted, (char**) &c->slice);
 454                 if (r < 0)
 455                         return r;
 456         }
 457
 458         *ret = c->slice;
 459         return 0;
 460 }
 461
 462 _public_ int sd_bus_creds_get_user_slice(sd_bus_creds *c, const char **ret) {
 463         int r;
 464
 465         assert_return(c, -EINVAL);
 466         assert_return(ret, -EINVAL);
 467
 468         if (!(c->mask & SD_BUS_CREDS_USER_SLICE))
 469                 return -ENODATA;
 470
 471         assert(c->cgroup);
 472
 473         if (!c->user_slice) {
 474                 const char *shifted;
 475
 476                 r = cg_shift_path(c->cgroup, c->cgroup_root, &shifted);
 477                 if (r < 0)
 478                         return r;
 479
 480                 r = cg_path_get_user_slice(shifted, (char**) &c->user_slice);
 481                 if (r < 0)
 482                         return r;
 483         }
 484
 485         *ret = c->user_slice;
 486         return 0;
 487 }
 488
 489 _public_ int sd_bus_creds_get_session(sd_bus_creds *c, const char **ret) {
 490         int r;
 491
 492         assert_return(c, -EINVAL);
 493         assert_return(ret, -EINVAL);
 494
 495         if (!(c->mask & SD_BUS_CREDS_SESSION))
 496                 return -ENODATA;
 497
 498         assert(c->cgroup);
 499
 500         if (!c->session) {
 501                 const char *shifted;
 502
 503                 r = cg_shift_path(c->cgroup, c->cgroup_root, &shifted);
 504                 if (r < 0)
 505                         return r;
 506
 507                 r = cg_path_get_session(shifted, (char**) &c->session);
 508                 if (r < 0)
 509                         return r;
 510         }
 511
 512         *ret = c->session;
 513         return 0;
 514 }
 515
 516 _public_ int sd_bus_creds_get_owner_uid(sd_bus_creds *c, uid_t *uid) {
 517         const char *shifted;
 518         int r;
 519
 520         assert_return(c, -EINVAL);
 521         assert_return(uid, -EINVAL);
 522
 523         if (!(c->mask & SD_BUS_CREDS_OWNER_UID))
 524                 return -ENODATA;
 525
 526         assert(c->cgroup);
 527
 528         r = cg_shift_path(c->cgroup, c->cgroup_root, &shifted);
 529         if (r < 0)
 530                 return r;
 531
 532         return cg_path_get_owner_uid(shifted, uid);
 533 }
 534
 535 _public_ int sd_bus_creds_get_cmdline(sd_bus_creds *c, char ***cmdline) {
 536         assert_return(c, -EINVAL);
 537
 538         if (!(c->mask & SD_BUS_CREDS_CMDLINE))
 539                 return -ENODATA;
 540
 541         if (!c->cmdline)
 542                 return -ENXIO;
 543
 544         if (!c->cmdline_array) {
 545                 c->cmdline_array = strv_parse_nulstr(c->cmdline, c->cmdline_size);
 546                 if (!c->cmdline_array)
 547                         return -ENOMEM;
 548         }
 549
 550         *cmdline = c->cmdline_array;
 551         return 0;
 552 }
 553
 554 _public_ int sd_bus_creds_get_audit_session_id(sd_bus_creds *c, uint32_t *sessionid) {
 555         assert_return(c, -EINVAL);
 556         assert_return(sessionid, -EINVAL);
 557
 558         if (!(c->mask & SD_BUS_CREDS_AUDIT_SESSION_ID))
 559                 return -ENODATA;
 560
 561         if (!audit_session_is_valid(c->audit_session_id))
 562                 return -ENXIO;
 563
 564         *sessionid = c->audit_session_id;
 565         return 0;
 566 }
 567
 568 _public_ int sd_bus_creds_get_audit_login_uid(sd_bus_creds *c, uid_t *uid) {
 569         assert_return(c, -EINVAL);
 570         assert_return(uid, -EINVAL);
 571
 572         if (!(c->mask & SD_BUS_CREDS_AUDIT_LOGIN_UID))
 573                 return -ENODATA;
 574
 575         if (!uid_is_valid(c->audit_login_uid))
 576                 return -ENXIO;
 577
 578         *uid = c->audit_login_uid;
 579         return 0;
 580 }
 581
 582 _public_ int sd_bus_creds_get_tty(sd_bus_creds *c, const char **ret) {
 583         assert_return(c, -EINVAL);
 584         assert_return(ret, -EINVAL);
 585
 586         if (!(c->mask & SD_BUS_CREDS_TTY))
 587                 return -ENODATA;
 588
 589         if (!c->tty)
 590                 return -ENXIO;
 591
 592         *ret = c->tty;
 593         return 0;
 594 }
 595
 596 _public_ int sd_bus_creds_get_unique_name(sd_bus_creds *c, const char **unique_name) {
 597         assert_return(c, -EINVAL);
 598         assert_return(unique_name, -EINVAL);
 599
 600         if (!(c->mask & SD_BUS_CREDS_UNIQUE_NAME))
 601                 return -ENODATA;
 602
 603         *unique_name = c->unique_name;
 604         return 0;
 605 }
 606
 607 _public_ int sd_bus_creds_get_well_known_names(sd_bus_creds *c, char ***well_known_names) {
 608         assert_return(c, -EINVAL);
 609         assert_return(well_known_names, -EINVAL);
 610
 611         if (!(c->mask & SD_BUS_CREDS_WELL_KNOWN_NAMES))
 612                 return -ENODATA;
 613
 614         /* As a special hack we return the bus driver as well-known
 615          * names list when this is requested. */
 616         if (c->well_known_names_driver) {
 617                 static const char* const wkn[] = {
 618                         "org.freedesktop.DBus",
 619                         NULL
 620                 };
 621
 622                 *well_known_names = (char**) wkn;
 623                 return 0;
 624         }
 625
 626         if (c->well_known_names_local) {
 627                 static const char* const wkn[] = {
 628                         "org.freedesktop.DBus.Local",
 629                         NULL
 630                 };
 631
 632                 *well_known_names = (char**) wkn;
 633                 return 0;
 634         }
 635
 636         *well_known_names = c->well_known_names;
 637         return 0;
 638 }
 639
 640 _public_ int sd_bus_creds_get_description(sd_bus_creds *c, const char **ret) {
 641         assert_return(c, -EINVAL);
 642         assert_return(ret, -EINVAL);
 643
 644         if (!(c->mask & SD_BUS_CREDS_DESCRIPTION))
 645                 return -ENODATA;
 646
 647         assert(c->description);
 648
 649         if (!c->unescaped_description) {
 650                 c->unescaped_description = bus_label_unescape(c->description);
 651                 if (!c->unescaped_description)
 652                         return -ENOMEM;
 653         }
 654
 655         *ret = c->unescaped_description;
 656         return 0;
 657 }
 658
 659 static int has_cap(sd_bus_creds *c, unsigned offset, int capability) {
 660         size_t sz;
 661
 662         assert(c);
 663         assert(capability >= 0);
 664         assert(c->capability);
 665
 666         if ((unsigned) capability > cap_last_cap())
 667                 return 0;
 668
 669         sz = DIV_ROUND_UP(cap_last_cap(), 32U);
 670
 671         return !!(c->capability[offset * sz + CAP_TO_INDEX(capability)] & CAP_TO_MASK(capability));
 672 }
 673
 674 _public_ int sd_bus_creds_has_effective_cap(sd_bus_creds *c, int capability) {
 675         assert_return(c, -EINVAL);
 676         assert_return(capability >= 0, -EINVAL);
 677
 678         if (!(c->mask & SD_BUS_CREDS_EFFECTIVE_CAPS))
 679                 return -ENODATA;
 680
 681         return has_cap(c, CAP_OFFSET_EFFECTIVE, capability);
 682 }
 683
 684 _public_ int sd_bus_creds_has_permitted_cap(sd_bus_creds *c, int capability) {
 685         assert_return(c, -EINVAL);
 686         assert_return(capability >= 0, -EINVAL);
 687
 688         if (!(c->mask & SD_BUS_CREDS_PERMITTED_CAPS))
 689                 return -ENODATA;
 690
 691         return has_cap(c, CAP_OFFSET_PERMITTED, capability);
 692 }
 693
 694 _public_ int sd_bus_creds_has_inheritable_cap(sd_bus_creds *c, int capability) {
 695         assert_return(c, -EINVAL);
 696         assert_return(capability >= 0, -EINVAL);
 697
 698         if (!(c->mask & SD_BUS_CREDS_INHERITABLE_CAPS))
 699                 return -ENODATA;
 700
 701         return has_cap(c, CAP_OFFSET_INHERITABLE, capability);
 702 }
 703
 704 _public_ int sd_bus_creds_has_bounding_cap(sd_bus_creds *c, int capability) {
 705         assert_return(c, -EINVAL);
 706         assert_return(capability >= 0, -EINVAL);
 707
 708         if (!(c->mask & SD_BUS_CREDS_BOUNDING_CAPS))
 709                 return -ENODATA;
 710
 711         return has_cap(c, CAP_OFFSET_BOUNDING, capability);
 712 }
 713
 714 static int parse_caps(sd_bus_creds *c, unsigned offset, const char *p) {
 715         size_t sz, max;
 716         unsigned i, j;
 717
 718         assert(c);
 719         assert(p);
 720
 721         max = DIV_ROUND_UP(cap_last_cap(), 32U);
 722         p += strspn(p, WHITESPACE);
 723
 724         sz = strlen(p);
 725         if (sz % 8 != 0)
 726                 return -EINVAL;
 727
 728         sz /= 8;
 729         if (sz > max)
 730                 return -EINVAL;
 731
 732         if (!c->capability) {
 733                 c->capability = new0(uint32_t, max * 4);
 734                 if (!c->capability)
 735                         return -ENOMEM;
 736         }
 737
 738         for (i = 0; i < sz; i ++) {
 739                 uint32_t v = 0;
 740
 741                 for (j = 0; j < 8; ++j) {
 742                         int t;
 743
 744                         t = unhexchar(*p++);
 745                         if (t < 0)
 746                                 return -EINVAL;
 747
 748                         v = (v << 4) | t;
 749                 }
 750
 751                 c->capability[offset * max + (sz - i - 1)] = v;
 752         }
 753
 754         return 0;
 755 }
 756
 757 int bus_creds_add_more(sd_bus_creds *c, uint64_t mask, pid_t pid, pid_t tid) {
 758         uint64_t missing;
 759         int r;
 760
 761         assert(c);
 762         assert(c->allocated);
 763
 764         if (!(mask & SD_BUS_CREDS_AUGMENT))
 765                 return 0;
 766
 767         /* Try to retrieve PID from creds if it wasn't passed to us */
 768         if (pid > 0) {
 769                 c->pid = pid;
 770                 c->mask |= SD_BUS_CREDS_PID;
 771         } else if (c->mask & SD_BUS_CREDS_PID)
 772                 pid = c->pid;
 773         else
 774                 /* Without pid we cannot do much... */
 775                 return 0;
 776
 777         /* Try to retrieve TID from creds if it wasn't passed to us */
 778         if (tid <= 0 && (c->mask & SD_BUS_CREDS_TID))
 779                 tid = c->tid;
 780
 781         /* Calculate what we shall and can add */
 782         missing = mask & ~(c->mask|SD_BUS_CREDS_PID|SD_BUS_CREDS_TID|SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_DESCRIPTION|SD_BUS_CREDS_AUGMENT);
 783         if (missing == 0)
 784                 return 0;
 785
 786         if (tid > 0) {
 787                 c->tid = tid;
 788                 c->mask |= SD_BUS_CREDS_TID;
 789         }
 790
 791         if (missing & (SD_BUS_CREDS_PPID |
 792                        SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_SUID | SD_BUS_CREDS_FSUID |
 793                        SD_BUS_CREDS_GID | SD_BUS_CREDS_EGID | SD_BUS_CREDS_SGID | SD_BUS_CREDS_FSGID |
 794                        SD_BUS_CREDS_SUPPLEMENTARY_GIDS |
 795                        SD_BUS_CREDS_EFFECTIVE_CAPS | SD_BUS_CREDS_INHERITABLE_CAPS |
 796                        SD_BUS_CREDS_PERMITTED_CAPS | SD_BUS_CREDS_BOUNDING_CAPS)) {
 797
 798                 _cleanup_fclose_ FILE *f = NULL;
 799                 const char *p;
 800
 801                 p = procfs_file_alloca(pid, "status");
 802
 803                 f = fopen(p, "re");
 804                 if (!f) {
 805                         if (errno == ENOENT)
 806                                 return -ESRCH;
 807                         else if (!IN_SET(errno, EPERM, EACCES))
 808                                 return -errno;
 809                 } else {
 810                         char line[LINE_MAX];
 811
 812                         FOREACH_LINE(line, f, return -errno) {
 813                                 truncate_nl(line);
 814
 815                                 if (missing & SD_BUS_CREDS_PPID) {
 816                                         p = startswith(line, "PPid:");
 817                                         if (p) {
 818                                                 p += strspn(p, WHITESPACE);
 819
 820                                                 /* Explicitly check for PPID 0 (which is the case for PID 1) */
 821                                                 if (!streq(p, "0")) {
 822                                                         r = parse_pid(p, &c->ppid);
 823                                                         if (r < 0)
 824                                                                 return r;
 825
 826                                                 } else
 827                                                         c->ppid = 0;
 828
 829                                                 c->mask |= SD_BUS_CREDS_PPID;
 830                                                 continue;
 831                                         }
 832                                 }
 833
 834                                 if (missing & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID)) {
 835                                         p = startswith(line, "Uid:");
 836                                         if (p) {
 837                                                 unsigned long uid, euid, suid, fsuid;
 838
 839                                                 p += strspn(p, WHITESPACE);
 840                                                 if (sscanf(p, "%lu %lu %lu %lu", &uid, &euid, &suid, &fsuid) != 4)
 841                                                         return -EIO;
 842
 843                                                 if (missing & SD_BUS_CREDS_UID)
 844                                                         c->uid = (uid_t) uid;
 845                                                 if (missing & SD_BUS_CREDS_EUID)
 846                                                         c->euid = (uid_t) euid;
 847                                                 if (missing & SD_BUS_CREDS_SUID)
 848                                                         c->suid = (uid_t) suid;
 849                                                 if (missing & SD_BUS_CREDS_FSUID)
 850                                                         c->fsuid = (uid_t) fsuid;
 851
 852                                                 c->mask |= missing & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID);
 853                                                 continue;
 854                                         }
 855                                 }
 856
 857                                 if (missing & (SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID)) {
 858                                         p = startswith(line, "Gid:");
 859                                         if (p) {
 860                                                 unsigned long gid, egid, sgid, fsgid;
 861
 862                                                 p += strspn(p, WHITESPACE);
 863                                                 if (sscanf(p, "%lu %lu %lu %lu", &gid, &egid, &sgid, &fsgid) != 4)
 864                                                         return -EIO;
 865
 866                                                 if (missing & SD_BUS_CREDS_GID)
 867                                                         c->gid = (gid_t) gid;
 868                                                 if (missing & SD_BUS_CREDS_EGID)
 869                                                         c->egid = (gid_t) egid;
 870                                                 if (missing & SD_BUS_CREDS_SGID)
 871                                                         c->sgid = (gid_t) sgid;
 872                                                 if (missing & SD_BUS_CREDS_FSGID)
 873                                                         c->fsgid = (gid_t) fsgid;
 874
 875                                                 c->mask |= missing & (SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID);
 876                                                 continue;
 877                                         }
 878                                 }
 879
 880                                 if (missing & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) {
 881                                         p = startswith(line, "Groups:");
 882                                         if (p) {
 883                                                 size_t allocated = 0;
 884
 885                                                 for (;;) {
 886                                                         unsigned long g;
 887                                                         int n = 0;
 888
 889                                                         p += strspn(p, WHITESPACE);
 890                                                         if (*p == 0)
 891                                                                 break;
 892
 893                                                         if (sscanf(p, "%lu%n", &g, &n) != 1)
 894                                                                 return -EIO;
 895
 896                                                         if (!GREEDY_REALLOC(c->supplementary_gids, allocated, c->n_supplementary_gids+1))
 897                                                                 return -ENOMEM;
 898
 899                                                         c->supplementary_gids[c->n_supplementary_gids++] = (gid_t) g;
 900                                                         p += n;
 901                                                 }
 902
 903                                                 c->mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS;
 904                                                 continue;
 905                                         }
 906                                 }
 907
 908                                 if (missing & SD_BUS_CREDS_EFFECTIVE_CAPS) {
 909                                         p = startswith(line, "CapEff:");
 910                                         if (p) {
 911                                                 r = parse_caps(c, CAP_OFFSET_EFFECTIVE, p);
 912                                                 if (r < 0)
 913                                                         return r;
 914
 915                                                 c->mask |= SD_BUS_CREDS_EFFECTIVE_CAPS;
 916                                                 continue;
 917                                         }
 918                                 }
 919
 920                                 if (missing & SD_BUS_CREDS_PERMITTED_CAPS) {
 921                                         p = startswith(line, "CapPrm:");
 922                                         if (p) {
 923                                                 r = parse_caps(c, CAP_OFFSET_PERMITTED, p);
 924                                                 if (r < 0)
 925                                                         return r;
 926
 927                                                 c->mask |= SD_BUS_CREDS_PERMITTED_CAPS;
 928                                                 continue;
 929                                         }
 930                                 }
 931
 932                                 if (missing & SD_BUS_CREDS_INHERITABLE_CAPS) {
 933                                         p = startswith(line, "CapInh:");
 934                                         if (p) {
 935                                                 r = parse_caps(c, CAP_OFFSET_INHERITABLE, p);
 936                                                 if (r < 0)
 937                                                         return r;
 938
 939                                                 c->mask |= SD_BUS_CREDS_INHERITABLE_CAPS;
 940                                                 continue;
 941                                         }
 942                                 }
 943
 944                                 if (missing & SD_BUS_CREDS_BOUNDING_CAPS) {
 945                                         p = startswith(line, "CapBnd:");
 946                                         if (p) {
 947                                                 r = parse_caps(c, CAP_OFFSET_BOUNDING, p);
 948                                                 if (r < 0)
 949                                                         return r;
 950
 951                                                 c->mask |= SD_BUS_CREDS_BOUNDING_CAPS;
 952                                                 continue;
 953                                         }
 954                                 }
 955                         }
 956                 }
 957         }
 958
 959         if (missing & SD_BUS_CREDS_SELINUX_CONTEXT) {
 960                 const char *p;
 961
 962                 p = procfs_file_alloca(pid, "attr/current");
 963                 r = read_one_line_file(p, &c->label);
 964                 if (r < 0) {
 965                         if (!IN_SET(r, -ENOENT, -EINVAL, -EPERM, -EACCES))
 966                                 return r;
 967                 } else
 968                         c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
 969         }
 970
 971         if (missing & SD_BUS_CREDS_COMM) {
 972                 r = get_process_comm(pid, &c->comm);
 973                 if (r < 0) {
 974                         if (!IN_SET(r, -EPERM, -EACCES))
 975                                 return r;
 976                 } else
 977                         c->mask |= SD_BUS_CREDS_COMM;
 978         }
 979
 980         if (missing & SD_BUS_CREDS_EXE) {
 981                 r = get_process_exe(pid, &c->exe);
 982                 if (r == -ESRCH) {
 983                         /* Unfortunately we cannot really distinguish
 984                          * the case here where the process does not
 985                          * exist, and /proc/$PID/exe being unreadable
 986                          * because $PID is a kernel thread. Hence,
 987                          * assume it is a kernel thread, and rely on
 988                          * that this case is caught with a later
 989                          * call. */
 990                         c->exe = NULL;
 991                         c->mask |= SD_BUS_CREDS_EXE;
 992                 } else if (r < 0) {
 993                         if (!IN_SET(r, -EPERM, -EACCES))
 994                                 return r;
 995                 } else
 996                         c->mask |= SD_BUS_CREDS_EXE;
 997         }
 998
 999         if (missing & SD_BUS_CREDS_CMDLINE) {
1000                 const char *p;
1001
1002                 p = procfs_file_alloca(pid, "cmdline");
1003                 r = read_full_file(p, &c->cmdline, &c->cmdline_size);
1004                 if (r == -ENOENT)
1005                         return -ESRCH;
1006                 if (r < 0) {
1007                         if (!IN_SET(r, -EPERM, -EACCES))
1008                                 return r;
1009                 } else {
1010                         if (c->cmdline_size == 0)
1011                                 c->cmdline = mfree(c->cmdline);
1012
1013                         c->mask |= SD_BUS_CREDS_CMDLINE;
1014                 }
1015         }
1016
1017         if (tid > 0 && (missing & SD_BUS_CREDS_TID_COMM)) {
1018                 _cleanup_free_ char *p = NULL;
1019
1020                 if (asprintf(&p, "/proc/"PID_FMT"/task/"PID_FMT"/comm", pid, tid) < 0)
1021                         return -ENOMEM;
1022
1023                 r = read_one_line_file(p, &c->tid_comm);
1024                 if (r == -ENOENT)
1025                         return -ESRCH;
1026                 if (r < 0) {
1027                         if (!IN_SET(r, -EPERM, -EACCES))
1028                                 return r;
1029                 } else
1030                         c->mask |= SD_BUS_CREDS_TID_COMM;
1031         }
1032
1033         if (missing & (SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_USER_SLICE|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_OWNER_UID)) {
1034
1035                 if (!c->cgroup) {
1036                         r = cg_pid_get_path(NULL, pid, &c->cgroup);
1037                         if (r < 0) {
1038                                 if (!IN_SET(r, -EPERM, -EACCES))
1039                                         return r;
1040                         }
1041                 }
1042
1043                 if (!c->cgroup_root) {
1044                         r = cg_get_root_path(&c->cgroup_root);
1045                         if (r < 0)
1046                                 return r;
1047                 }
1048
1049                 if (c->cgroup)
1050                         c->mask |= missing & (SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_USER_SLICE|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_OWNER_UID);
1051         }
1052
1053         if (missing & SD_BUS_CREDS_AUDIT_SESSION_ID) {
1054                 r = audit_session_from_pid(pid, &c->audit_session_id);
1055                 if (r == -ENODATA) {
1056                         /* ENODATA means: no audit session id assigned */
1057                         c->audit_session_id = AUDIT_SESSION_INVALID;
1058                         c->mask |= SD_BUS_CREDS_AUDIT_SESSION_ID;
1059                 } else if (r < 0) {
1060                         if (!IN_SET(r, -EOPNOTSUPP, -ENOENT, -EPERM, -EACCES))
1061                                 return r;
1062                 } else
1063                         c->mask |= SD_BUS_CREDS_AUDIT_SESSION_ID;
1064         }
1065
1066         if (missing & SD_BUS_CREDS_AUDIT_LOGIN_UID) {
1067                 r = audit_loginuid_from_pid(pid, &c->audit_login_uid);
1068                 if (r == -ENODATA) {
1069                         /* ENODATA means: no audit login uid assigned */
1070                         c->audit_login_uid = UID_INVALID;
1071                         c->mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID;
1072                 } else if (r < 0) {
1073                         if (!IN_SET(r, -EOPNOTSUPP, -ENOENT, -EPERM, -EACCES))
1074                                 return r;
1075                 } else
1076                         c->mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID;
1077         }
1078
1079         if (missing & SD_BUS_CREDS_TTY) {
1080                 r = get_ctty(pid, NULL, &c->tty);
1081                 if (r == -ENXIO) {
1082                         /* ENXIO means: process has no controlling TTY */
1083                         c->tty = NULL;
1084                         c->mask |= SD_BUS_CREDS_TTY;
1085                 } else if (r < 0) {
1086                         if (!IN_SET(r, -EPERM, -EACCES, -ENOENT))
1087                                 return r;
1088                 } else
1089                         c->mask |= SD_BUS_CREDS_TTY;
1090         }
1091
1092         /* In case only the exe path was to be read we cannot
1093          * distinguish the case where the exe path was unreadable
1094          * because the process was a kernel thread, or when the
1095          * process didn't exist at all. Hence, let's do a final check,
1096          * to be sure. */
1097         if (!pid_is_alive(pid))
1098                 return -ESRCH;
1099
1100         if (tid > 0 && tid != pid && !pid_is_unwaited(tid))
1101                 return -ESRCH;
1102
1103         c->augmented = missing & c->mask;
1104
1105         return 0;
1106 }
1107
1108 int bus_creds_extend_by_pid(sd_bus_creds *c, uint64_t mask, sd_bus_creds **ret) {
1109         _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *n = NULL;
1110         int r;
1111
1112         assert(c);
1113         assert(ret);
1114
1115         if ((mask & ~c->mask) == 0 || (!(mask & SD_BUS_CREDS_AUGMENT))) {
1116                 /* There's already all data we need, or augmentation
1117                  * wasn't turned on. */
1118
1119                 *ret = sd_bus_creds_ref(c);
1120                 return 0;
1121         }
1122
1123         n = bus_creds_new();
1124         if (!n)
1125                 return -ENOMEM;
1126
1127         /* Copy the original data over */
1128
1129         if (c->mask & mask & SD_BUS_CREDS_PID) {
1130                 n->pid = c->pid;
1131                 n->mask |= SD_BUS_CREDS_PID;
1132         }
1133
1134         if (c->mask & mask & SD_BUS_CREDS_TID) {
1135                 n->tid = c->tid;
1136                 n->mask |= SD_BUS_CREDS_TID;
1137         }
1138
1139         if (c->mask & mask & SD_BUS_CREDS_PPID) {
1140                 n->ppid = c->ppid;
1141                 n->mask |= SD_BUS_CREDS_PPID;
1142         }
1143
1144         if (c->mask & mask & SD_BUS_CREDS_UID) {
1145                 n->uid = c->uid;
1146                 n->mask |= SD_BUS_CREDS_UID;
1147         }
1148
1149         if (c->mask & mask & SD_BUS_CREDS_EUID) {
1150                 n->euid = c->euid;
1151                 n->mask |= SD_BUS_CREDS_EUID;
1152         }
1153
1154         if (c->mask & mask & SD_BUS_CREDS_SUID) {
1155                 n->suid = c->suid;
1156                 n->mask |= SD_BUS_CREDS_SUID;
1157         }
1158
1159         if (c->mask & mask & SD_BUS_CREDS_FSUID) {
1160                 n->fsuid = c->fsuid;
1161                 n->mask |= SD_BUS_CREDS_FSUID;
1162         }
1163
1164         if (c->mask & mask & SD_BUS_CREDS_GID) {
1165                 n->gid = c->gid;
1166                 n->mask |= SD_BUS_CREDS_GID;
1167         }
1168
1169         if (c->mask & mask & SD_BUS_CREDS_EGID) {
1170                 n->egid = c->egid;
1171                 n->mask |= SD_BUS_CREDS_EGID;
1172         }
1173
1174         if (c->mask & mask & SD_BUS_CREDS_SGID) {
1175                 n->sgid = c->sgid;
1176                 n->mask |= SD_BUS_CREDS_SGID;
1177         }
1178
1179         if (c->mask & mask & SD_BUS_CREDS_FSGID) {
1180                 n->fsgid = c->fsgid;
1181                 n->mask |= SD_BUS_CREDS_FSGID;
1182         }
1183
1184         if (c->mask & mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) {
1185                 if (c->supplementary_gids) {
1186                         n->supplementary_gids = newdup(gid_t, c->supplementary_gids, c->n_supplementary_gids);
1187                         if (!n->supplementary_gids)
1188                                 return -ENOMEM;
1189                         n->n_supplementary_gids = c->n_supplementary_gids;
1190                 } else {
1191                         n->supplementary_gids = NULL;
1192                         n->n_supplementary_gids = 0;
1193                 }
1194
1195                 n->mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS;
1196         }
1197
1198         if (c->mask & mask & SD_BUS_CREDS_COMM) {
1199                 assert(c->comm);
1200
1201                 n->comm = strdup(c->comm);
1202                 if (!n->comm)
1203                         return -ENOMEM;
1204
1205                 n->mask |= SD_BUS_CREDS_COMM;
1206         }
1207
1208         if (c->mask & mask & SD_BUS_CREDS_TID_COMM) {
1209                 assert(c->tid_comm);
1210
1211                 n->tid_comm = strdup(c->tid_comm);
1212                 if (!n->tid_comm)
1213                         return -ENOMEM;
1214
1215                 n->mask |= SD_BUS_CREDS_TID_COMM;
1216         }
1217
1218         if (c->mask & mask & SD_BUS_CREDS_EXE) {
1219                 if (c->exe) {
1220                         n->exe = strdup(c->exe);
1221                         if (!n->exe)
1222                                 return -ENOMEM;
1223                 } else
1224                         n->exe = NULL;
1225
1226                 n->mask |= SD_BUS_CREDS_EXE;
1227         }
1228
1229         if (c->mask & mask & SD_BUS_CREDS_CMDLINE) {
1230                 if (c->cmdline) {
1231                         n->cmdline = memdup(c->cmdline, c->cmdline_size);
1232                         if (!n->cmdline)
1233                                 return -ENOMEM;
1234
1235                         n->cmdline_size = c->cmdline_size;
1236                 } else {
1237                         n->cmdline = NULL;
1238                         n->cmdline_size = 0;
1239                 }
1240
1241                 n->mask |= SD_BUS_CREDS_CMDLINE;
1242         }
1243
1244         if (c->mask & mask & (SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_USER_SLICE|SD_BUS_CREDS_OWNER_UID)) {
1245                 assert(c->cgroup);
1246
1247                 n->cgroup = strdup(c->cgroup);
1248                 if (!n->cgroup)
1249                         return -ENOMEM;
1250
1251                 n->cgroup_root = strdup(c->cgroup_root);
1252                 if (!n->cgroup_root)
1253                         return -ENOMEM;
1254
1255                 n->mask |= mask & (SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_USER_SLICE|SD_BUS_CREDS_OWNER_UID);
1256         }
1257
1258         if (c->mask & mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS)) {
1259                 assert(c->capability);
1260
1261                 n->capability = memdup(c->capability, DIV_ROUND_UP(cap_last_cap(), 32U) * 4 * 4);
1262                 if (!n->capability)
1263                         return -ENOMEM;
1264
1265                 n->mask |= c->mask & mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS);
1266         }
1267
1268         if (c->mask & mask & SD_BUS_CREDS_SELINUX_CONTEXT) {
1269                 assert(c->label);
1270
1271                 n->label = strdup(c->label);
1272                 if (!n->label)
1273                         return -ENOMEM;
1274                 n->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
1275         }
1276
1277         if (c->mask & mask & SD_BUS_CREDS_AUDIT_SESSION_ID) {
1278                 n->audit_session_id = c->audit_session_id;
1279                 n->mask |= SD_BUS_CREDS_AUDIT_SESSION_ID;
1280         }
1281         if (c->mask & mask & SD_BUS_CREDS_AUDIT_LOGIN_UID) {
1282                 n->audit_login_uid = c->audit_login_uid;
1283                 n->mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID;
1284         }
1285
1286         if (c->mask & mask & SD_BUS_CREDS_TTY) {
1287                 if (c->tty) {
1288                         n->tty = strdup(c->tty);
1289                         if (!n->tty)
1290                                 return -ENOMEM;
1291                 } else
1292                         n->tty = NULL;
1293                 n->mask |= SD_BUS_CREDS_TTY;
1294         }
1295
1296         if (c->mask & mask & SD_BUS_CREDS_UNIQUE_NAME) {
1297                 assert(c->unique_name);
1298
1299                 n->unique_name = strdup(c->unique_name);
1300                 if (!n->unique_name)
1301                         return -ENOMEM;
1302                 n->mask |= SD_BUS_CREDS_UNIQUE_NAME;
1303         }
1304
1305         if (c->mask & mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) {
1306                 if (strv_isempty(c->well_known_names))
1307                         n->well_known_names = NULL;
1308                 else {
1309                         n->well_known_names = strv_copy(c->well_known_names);
1310                         if (!n->well_known_names)
1311                                 return -ENOMEM;
1312                 }
1313                 n->well_known_names_driver = c->well_known_names_driver;
1314                 n->well_known_names_local = c->well_known_names_local;
1315                 n->mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES;
1316         }
1317
1318         if (c->mask & mask & SD_BUS_CREDS_DESCRIPTION) {
1319                 assert(c->description);
1320                 n->description = strdup(c->description);
1321                 if (!n->description)
1322                         return -ENOMEM;
1323                 n->mask |= SD_BUS_CREDS_DESCRIPTION;
1324         }
1325
1326         n->augmented = c->augmented & n->mask;
1327
1328         /* Get more data */
1329
1330         r = bus_creds_add_more(n, mask, 0, 0);
1331         if (r < 0)
1332                 return r;
1333
1334         *ret = TAKE_PTR(n);
1335
1336         return 0;
1337 }