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