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

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <linux/capability.h>
   4 #include <stdlib.h>
   5
   6 #include "alloc-util.h"
   7 #include "audit-util.h"
   8 #include "bus-creds.h"
   9 #include "bus-label.h"
  10 #include "bus-message.h"
  11 #include "bus-util.h"
  12 #include "capability-util.h"
  13 #include "cgroup-util.h"
  14 #include "fd-util.h"
  15 #include "fileio.h"
  16 #include "format-util.h"
  17 #include "hexdecoct.h"
  18 #include "parse-util.h"
  19 #include "process-util.h"
  20 #include "string-util.h"
  21 #include "strv.h"
  22 #include "terminal-util.h"
  23 #include "user-util.h"
  24 #include "util.h"
  25
  26 enum {
  27         CAP_OFFSET_INHERITABLE = 0,
  28         CAP_OFFSET_PERMITTED = 1,
  29         CAP_OFFSET_EFFECTIVE = 2,
  30         CAP_OFFSET_BOUNDING = 3
  31 };
  32
  33 void bus_creds_done(sd_bus_creds *c) {
  34         assert(c);
  35
  36         /* For internal bus cred structures that are allocated by
  37          * something else */
  38
  39         free(c->session);
  40         free(c->unit);
  41         free(c->user_unit);
  42         free(c->slice);
  43         free(c->user_slice);
  44         free(c->unescaped_description);
  45         free(c->supplementary_gids);
  46         free(c->tty);
  47
  48         free(c->well_known_names); /* note that this is an strv, but
  49                                     * we only free the array, not the
  50                                     * strings the array points to. The
  51                                     * full strv we only free if
  52                                     * c->allocated is set, see
  53                                     * below. */
  54
  55         strv_free(c->cmdline_array);
  56 }
  57
  58 _public_ sd_bus_creds *sd_bus_creds_ref(sd_bus_creds *c) {
  59
  60         if (!c)
  61                 return NULL;
  62
  63         if (c->allocated) {
  64                 assert(c->n_ref > 0);
  65                 c->n_ref++;
  66         } else {
  67                 sd_bus_message *m;
  68
  69                 /* If this is an embedded creds structure, then
  70                  * forward ref counting to the message */
  71                 m = container_of(c, sd_bus_message, creds);
  72                 sd_bus_message_ref(m);
  73         }
  74
  75         return c;
  76 }
  77
  78 _public_ sd_bus_creds *sd_bus_creds_unref(sd_bus_creds *c) {
  79
  80         if (!c)
  81                 return NULL;
  82
  83         if (c->allocated) {
  84                 assert(c->n_ref > 0);
  85                 c->n_ref--;
  86
  87                 if (c->n_ref == 0) {
  88                         free(c->comm);
  89                         free(c->tid_comm);
  90                         free(c->exe);
  91                         free(c->cmdline);
  92                         free(c->cgroup);
  93                         free(c->capability);
  94                         free(c->label);
  95                         free(c->unique_name);
  96                         free(c->cgroup_root);
  97                         free(c->description);
  98
  99                         c->supplementary_gids = mfree(c->supplementary_gids);
 100
 101                         c->well_known_names = strv_free(c->well_known_names);
 102
 103                         bus_creds_done(c);
 104
 105                         free(c);
 106                 }
 107         } else {
 108                 sd_bus_message *m;
 109
 110                 m = container_of(c, sd_bus_message, creds);
 111                 sd_bus_message_unref(m);
 112         }
 113
 114         return NULL;
 115 }
 116
 117 _public_ uint64_t sd_bus_creds_get_mask(const sd_bus_creds *c) {
 118         assert_return(c, 0);
 119
 120         return c->mask;
 121 }
 122
 123 _public_ uint64_t sd_bus_creds_get_augmented_mask(const sd_bus_creds *c) {
 124         assert_return(c, 0);
 125
 126         return c->augmented;
 127 }
 128
 129 sd_bus_creds* bus_creds_new(void) {
 130         sd_bus_creds *c;
 131
 132         c = new0(sd_bus_creds, 1);
 133         if (!c)
 134                 return NULL;
 135
 136         c->allocated = true;
 137         c->n_ref = 1;
 138         return c;
 139 }
 140
 141 _public_ int sd_bus_creds_new_from_pid(sd_bus_creds **ret, pid_t pid, uint64_t mask) {
 142         sd_bus_creds *c;
 143         int r;
 144
 145         assert_return(pid >= 0, -EINVAL);
 146         assert_return(mask <= _SD_BUS_CREDS_ALL, -EOPNOTSUPP);
 147         assert_return(ret, -EINVAL);
 148
 149         if (pid == 0)
 150                 pid = getpid_cached();
 151
 152         c = bus_creds_new();
 153         if (!c)
 154                 return -ENOMEM;
 155
 156         r = bus_creds_add_more(c, mask | SD_BUS_CREDS_AUGMENT, pid, 0);
 157         if (r < 0) {
 158                 sd_bus_creds_unref(c);
 159                 return r;
 160         }
 161
 162         /* Check if the process existed at all, in case we haven't
 163          * figured that out already */
 164         if (!pid_is_alive(pid)) {
 165                 sd_bus_creds_unref(c);
 166                 return -ESRCH;
 167         }
 168
 169         *ret = c;
 170         return 0;
 171 }
 172
 173 _public_ int sd_bus_creds_get_uid(sd_bus_creds *c, uid_t *uid) {
 174         assert_return(c, -EINVAL);
 175         assert_return(uid, -EINVAL);
 176
 177         if (!(c->mask & SD_BUS_CREDS_UID))
 178                 return -ENODATA;
 179
 180         *uid = c->uid;
 181         return 0;
 182 }
 183
 184 _public_ int sd_bus_creds_get_euid(sd_bus_creds *c, uid_t *euid) {
 185         assert_return(c, -EINVAL);
 186         assert_return(euid, -EINVAL);
 187
 188         if (!(c->mask & SD_BUS_CREDS_EUID))
 189                 return -ENODATA;
 190
 191         *euid = c->euid;
 192         return 0;
 193 }
 194
 195 _public_ int sd_bus_creds_get_suid(sd_bus_creds *c, uid_t *suid) {
 196         assert_return(c, -EINVAL);
 197         assert_return(suid, -EINVAL);
 198
 199         if (!(c->mask & SD_BUS_CREDS_SUID))
 200                 return -ENODATA;
 201
 202         *suid = c->suid;
 203         return 0;
 204 }
 205
 206 _public_ int sd_bus_creds_get_fsuid(sd_bus_creds *c, uid_t *fsuid) {
 207         assert_return(c, -EINVAL);
 208         assert_return(fsuid, -EINVAL);
 209
 210         if (!(c->mask & SD_BUS_CREDS_FSUID))
 211                 return -ENODATA;
 212
 213         *fsuid = c->fsuid;
 214         return 0;
 215 }
 216
 217 _public_ int sd_bus_creds_get_gid(sd_bus_creds *c, gid_t *gid) {
 218         assert_return(c, -EINVAL);
 219         assert_return(gid, -EINVAL);
 220
 221         if (!(c->mask & SD_BUS_CREDS_GID))
 222                 return -ENODATA;
 223
 224         *gid = c->gid;
 225         return 0;
 226 }
 227
 228 _public_ int sd_bus_creds_get_egid(sd_bus_creds *c, gid_t *egid) {
 229         assert_return(c, -EINVAL);
 230         assert_return(egid, -EINVAL);
 231
 232         if (!(c->mask & SD_BUS_CREDS_EGID))
 233                 return -ENODATA;
 234
 235         *egid = c->egid;
 236         return 0;
 237 }
 238
 239 _public_ int sd_bus_creds_get_sgid(sd_bus_creds *c, gid_t *sgid) {
 240         assert_return(c, -EINVAL);
 241         assert_return(sgid, -EINVAL);
 242
 243         if (!(c->mask & SD_BUS_CREDS_SGID))
 244                 return -ENODATA;
 245
 246         *sgid = c->sgid;
 247         return 0;
 248 }
 249
 250 _public_ int sd_bus_creds_get_fsgid(sd_bus_creds *c, gid_t *fsgid) {
 251         assert_return(c, -EINVAL);
 252         assert_return(fsgid, -EINVAL);
 253
 254         if (!(c->mask & SD_BUS_CREDS_FSGID))
 255                 return -ENODATA;
 256
 257         *fsgid = c->fsgid;
 258         return 0;
 259 }
 260
 261 _public_ int sd_bus_creds_get_supplementary_gids(sd_bus_creds *c, const gid_t **gids) {
 262         assert_return(c, -EINVAL);
 263         assert_return(gids, -EINVAL);
 264
 265         if (!(c->mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS))
 266                 return -ENODATA;
 267
 268         *gids = c->supplementary_gids;
 269         return (int) c->n_supplementary_gids;
 270 }
 271
 272 _public_ int sd_bus_creds_get_pid(sd_bus_creds *c, pid_t *pid) {
 273         assert_return(c, -EINVAL);
 274         assert_return(pid, -EINVAL);
 275
 276         if (!(c->mask & SD_BUS_CREDS_PID))
 277                 return -ENODATA;
 278
 279         assert(c->pid > 0);
 280         *pid = c->pid;
 281         return 0;
 282 }
 283
 284 _public_ int sd_bus_creds_get_ppid(sd_bus_creds *c, pid_t *ppid) {
 285         assert_return(c, -EINVAL);
 286         assert_return(ppid, -EINVAL);
 287
 288         if (!(c->mask & SD_BUS_CREDS_PPID))
 289                 return -ENODATA;
 290
 291         /* PID 1 has no parent process. Let's distinguish the case of
 292          * not knowing and not having a parent process by the returned
 293          * error code. */
 294         if (c->ppid == 0)
 295                 return -ENXIO;
 296
 297         *ppid = c->ppid;
 298         return 0;
 299 }
 300
 301 _public_ int sd_bus_creds_get_tid(sd_bus_creds *c, pid_t *tid) {
 302         assert_return(c, -EINVAL);
 303         assert_return(tid, -EINVAL);
 304
 305         if (!(c->mask & SD_BUS_CREDS_TID))
 306                 return -ENODATA;
 307
 308         assert(c->tid > 0);
 309         *tid = c->tid;
 310         return 0;
 311 }
 312
 313 _public_ int sd_bus_creds_get_selinux_context(sd_bus_creds *c, const char **ret) {
 314         assert_return(c, -EINVAL);
 315
 316         if (!(c->mask & SD_BUS_CREDS_SELINUX_CONTEXT))
 317                 return -ENODATA;
 318
 319         assert(c->label);
 320         *ret = c->label;
 321         return 0;
 322 }
 323
 324 _public_ int sd_bus_creds_get_comm(sd_bus_creds *c, const char **ret) {
 325         assert_return(c, -EINVAL);
 326         assert_return(ret, -EINVAL);
 327
 328         if (!(c->mask & SD_BUS_CREDS_COMM))
 329                 return -ENODATA;
 330
 331         assert(c->comm);
 332         *ret = c->comm;
 333         return 0;
 334 }
 335
 336 _public_ int sd_bus_creds_get_tid_comm(sd_bus_creds *c, const char **ret) {
 337         assert_return(c, -EINVAL);
 338         assert_return(ret, -EINVAL);
 339
 340         if (!(c->mask & SD_BUS_CREDS_TID_COMM))
 341                 return -ENODATA;
 342
 343         assert(c->tid_comm);
 344         *ret = c->tid_comm;
 345         return 0;
 346 }
 347
 348 _public_ int sd_bus_creds_get_exe(sd_bus_creds *c, const char **ret) {
 349         assert_return(c, -EINVAL);
 350         assert_return(ret, -EINVAL);
 351
 352         if (!(c->mask & SD_BUS_CREDS_EXE))
 353                 return -ENODATA;
 354
 355         if (!c->exe)
 356                 return -ENXIO;
 357
 358         *ret = c->exe;
 359         return 0;
 360 }
 361
 362 _public_ int sd_bus_creds_get_cgroup(sd_bus_creds *c, const char **ret) {
 363         assert_return(c, -EINVAL);
 364         assert_return(ret, -EINVAL);
 365
 366         if (!(c->mask & SD_BUS_CREDS_CGROUP))
 367                 return -ENODATA;
 368
 369         assert(c->cgroup);
 370         *ret = c->cgroup;
 371         return 0;
 372 }
 373
 374 _public_ int sd_bus_creds_get_unit(sd_bus_creds *c, const char **ret) {
 375         int r;
 376
 377         assert_return(c, -EINVAL);
 378         assert_return(ret, -EINVAL);
 379
 380         if (!(c->mask & SD_BUS_CREDS_UNIT))
 381                 return -ENODATA;
 382
 383         assert(c->cgroup);
 384
 385         if (!c->unit) {
 386                 const char *shifted;
 387
 388                 r = cg_shift_path(c->cgroup, c->cgroup_root, &shifted);
 389                 if (r < 0)
 390                         return r;
 391
 392                 r = cg_path_get_unit(shifted, (char**) &c->unit);
 393                 if (r < 0)
 394                         return r;
 395         }
 396
 397         *ret = c->unit;
 398         return 0;
 399 }
 400
 401 _public_ int sd_bus_creds_get_user_unit(sd_bus_creds *c, const char **ret) {
 402         int r;
 403
 404         assert_return(c, -EINVAL);
 405         assert_return(ret, -EINVAL);
 406
 407         if (!(c->mask & SD_BUS_CREDS_USER_UNIT))
 408                 return -ENODATA;
 409
 410         assert(c->cgroup);
 411
 412         if (!c->user_unit) {
 413                 const char *shifted;
 414
 415                 r = cg_shift_path(c->cgroup, c->cgroup_root, &shifted);
 416                 if (r < 0)
 417                         return r;
 418
 419                 r = cg_path_get_user_unit(shifted, (char**) &c->user_unit);
 420                 if (r < 0)
 421                         return r;
 422         }
 423
 424         *ret = c->user_unit;
 425         return 0;
 426 }
 427
 428 _public_ int sd_bus_creds_get_slice(sd_bus_creds *c, const char **ret) {
 429         int r;
 430
 431         assert_return(c, -EINVAL);
 432         assert_return(ret, -EINVAL);
 433
 434         if (!(c->mask & SD_BUS_CREDS_SLICE))
 435                 return -ENODATA;
 436
 437         assert(c->cgroup);
 438
 439         if (!c->slice) {
 440                 const char *shifted;
 441
 442                 r = cg_shift_path(c->cgroup, c->cgroup_root, &shifted);
 443                 if (r < 0)
 444                         return r;
 445
 446                 r = cg_path_get_slice(shifted, (char**) &c->slice);
 447                 if (r < 0)
 448                         return r;
 449         }
 450
 451         *ret = c->slice;
 452         return 0;
 453 }
 454
 455 _public_ int sd_bus_creds_get_user_slice(sd_bus_creds *c, const char **ret) {
 456         int r;
 457
 458         assert_return(c, -EINVAL);
 459         assert_return(ret, -EINVAL);
 460
 461         if (!(c->mask & SD_BUS_CREDS_USER_SLICE))
 462                 return -ENODATA;
 463
 464         assert(c->cgroup);
 465
 466         if (!c->user_slice) {
 467                 const char *shifted;
 468
 469                 r = cg_shift_path(c->cgroup, c->cgroup_root, &shifted);
 470                 if (r < 0)
 471                         return r;
 472
 473                 r = cg_path_get_user_slice(shifted, (char**) &c->user_slice);
 474                 if (r < 0)
 475                         return r;
 476         }
 477
 478         *ret = c->user_slice;
 479         return 0;
 480 }
 481
 482 _public_ int sd_bus_creds_get_session(sd_bus_creds *c, const char **ret) {
 483         int r;
 484
 485         assert_return(c, -EINVAL);
 486         assert_return(ret, -EINVAL);
 487
 488         if (!(c->mask & SD_BUS_CREDS_SESSION))
 489                 return -ENODATA;
 490
 491         assert(c->cgroup);
 492
 493         if (!c->session) {
 494                 const char *shifted;
 495
 496                 r = cg_shift_path(c->cgroup, c->cgroup_root, &shifted);
 497                 if (r < 0)
 498                         return r;
 499
 500                 r = cg_path_get_session(shifted, (char**) &c->session);
 501                 if (r < 0)
 502                         return r;
 503         }
 504
 505         *ret = c->session;
 506         return 0;
 507 }
 508
 509 _public_ int sd_bus_creds_get_owner_uid(sd_bus_creds *c, uid_t *uid) {
 510         const char *shifted;
 511         int r;
 512
 513         assert_return(c, -EINVAL);
 514         assert_return(uid, -EINVAL);
 515
 516         if (!(c->mask & SD_BUS_CREDS_OWNER_UID))
 517                 return -ENODATA;
 518
 519         assert(c->cgroup);
 520
 521         r = cg_shift_path(c->cgroup, c->cgroup_root, &shifted);
 522         if (r < 0)
 523                 return r;
 524
 525         return cg_path_get_owner_uid(shifted, uid);
 526 }
 527
 528 _public_ int sd_bus_creds_get_cmdline(sd_bus_creds *c, char ***cmdline) {
 529         assert_return(c, -EINVAL);
 530
 531         if (!(c->mask & SD_BUS_CREDS_CMDLINE))
 532                 return -ENODATA;
 533
 534         if (!c->cmdline)
 535                 return -ENXIO;
 536
 537         if (!c->cmdline_array) {
 538                 c->cmdline_array = strv_parse_nulstr(c->cmdline, c->cmdline_size);
 539                 if (!c->cmdline_array)
 540                         return -ENOMEM;
 541         }
 542
 543         *cmdline = c->cmdline_array;
 544         return 0;
 545 }
 546
 547 _public_ int sd_bus_creds_get_audit_session_id(sd_bus_creds *c, uint32_t *sessionid) {
 548         assert_return(c, -EINVAL);
 549         assert_return(sessionid, -EINVAL);
 550
 551         if (!(c->mask & SD_BUS_CREDS_AUDIT_SESSION_ID))
 552                 return -ENODATA;
 553
 554         if (!audit_session_is_valid(c->audit_session_id))
 555                 return -ENXIO;
 556
 557         *sessionid = c->audit_session_id;
 558         return 0;
 559 }
 560
 561 _public_ int sd_bus_creds_get_audit_login_uid(sd_bus_creds *c, uid_t *uid) {
 562         assert_return(c, -EINVAL);
 563         assert_return(uid, -EINVAL);
 564
 565         if (!(c->mask & SD_BUS_CREDS_AUDIT_LOGIN_UID))
 566                 return -ENODATA;
 567
 568         if (!uid_is_valid(c->audit_login_uid))
 569                 return -ENXIO;
 570
 571         *uid = c->audit_login_uid;
 572         return 0;
 573 }
 574
 575 _public_ int sd_bus_creds_get_tty(sd_bus_creds *c, const char **ret) {
 576         assert_return(c, -EINVAL);
 577         assert_return(ret, -EINVAL);
 578
 579         if (!(c->mask & SD_BUS_CREDS_TTY))
 580                 return -ENODATA;
 581
 582         if (!c->tty)
 583                 return -ENXIO;
 584
 585         *ret = c->tty;
 586         return 0;
 587 }
 588
 589 _public_ int sd_bus_creds_get_unique_name(sd_bus_creds *c, const char **unique_name) {
 590         assert_return(c, -EINVAL);
 591         assert_return(unique_name, -EINVAL);
 592
 593         if (!(c->mask & SD_BUS_CREDS_UNIQUE_NAME))
 594                 return -ENODATA;
 595
 596         *unique_name = c->unique_name;
 597         return 0;
 598 }
 599
 600 _public_ int sd_bus_creds_get_well_known_names(sd_bus_creds *c, char ***well_known_names) {
 601         assert_return(c, -EINVAL);
 602         assert_return(well_known_names, -EINVAL);
 603
 604         if (!(c->mask & SD_BUS_CREDS_WELL_KNOWN_NAMES))
 605                 return -ENODATA;
 606
 607         /* As a special hack we return the bus driver as well-known
 608          * names list when this is requested. */
 609         if (c->well_known_names_driver) {
 610                 static const char* const wkn[] = {
 611                         "org.freedesktop.DBus",
 612                         NULL
 613                 };
 614
 615                 *well_known_names = (char**) wkn;
 616                 return 0;
 617         }
 618
 619         if (c->well_known_names_local) {
 620                 static const char* const wkn[] = {
 621                         "org.freedesktop.DBus.Local",
 622                         NULL
 623                 };
 624
 625                 *well_known_names = (char**) wkn;
 626                 return 0;
 627         }
 628
 629         *well_known_names = c->well_known_names;
 630         return 0;
 631 }
 632
 633 _public_ int sd_bus_creds_get_description(sd_bus_creds *c, const char **ret) {
 634         assert_return(c, -EINVAL);
 635         assert_return(ret, -EINVAL);
 636
 637         if (!(c->mask & SD_BUS_CREDS_DESCRIPTION))
 638                 return -ENODATA;
 639
 640         assert(c->description);
 641
 642         if (!c->unescaped_description) {
 643                 c->unescaped_description = bus_label_unescape(c->description);
 644                 if (!c->unescaped_description)
 645                         return -ENOMEM;
 646         }
 647
 648         *ret = c->unescaped_description;
 649         return 0;
 650 }
 651
 652 static int has_cap(sd_bus_creds *c, size_t offset, int capability) {
 653         unsigned long lc;
 654         size_t sz;
 655
 656         assert(c);
 657         assert(capability >= 0);
 658         assert(c->capability);
 659
 660         lc = cap_last_cap();
 661
 662         if ((unsigned long) capability > lc)
 663                 return 0;
 664
 665         /* If the last cap is 63, then there are 64 caps defined, and we need 2 entries á 32bit hence. *
 666          * If the last cap is 64, then there are 65 caps defined, and we need 3 entries á 32bit hence. */
 667         sz = DIV_ROUND_UP(lc+1, 32LU);
 668
 669         return !!(c->capability[offset * sz + CAP_TO_INDEX((uint32_t) capability)] & CAP_TO_MASK_CORRECTED((uint32_t) 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()+1, 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
 809                         for (;;) {
 810                                 _cleanup_free_ char *line = NULL;
 811
 812                                 r = read_line(f, LONG_LINE_MAX, &line);
 813                                 if (r < 0)
 814                                         return r;
 815                                 if (r == 0)
 816                                         break;
 817
 818                                 if (missing & SD_BUS_CREDS_PPID) {
 819                                         p = startswith(line, "PPid:");
 820                                         if (p) {
 821                                                 p += strspn(p, WHITESPACE);
 822
 823                                                 /* Explicitly check for PPID 0 (which is the case for PID 1) */
 824                                                 if (!streq(p, "0")) {
 825                                                         r = parse_pid(p, &c->ppid);
 826                                                         if (r < 0)
 827                                                                 return r;
 828
 829                                                 } else
 830                                                         c->ppid = 0;
 831
 832                                                 c->mask |= SD_BUS_CREDS_PPID;
 833                                                 continue;
 834                                         }
 835                                 }
 836
 837                                 if (missing & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID)) {
 838                                         p = startswith(line, "Uid:");
 839                                         if (p) {
 840                                                 unsigned long uid, euid, suid, fsuid;
 841
 842                                                 p += strspn(p, WHITESPACE);
 843                                                 if (sscanf(p, "%lu %lu %lu %lu", &uid, &euid, &suid, &fsuid) != 4)
 844                                                         return -EIO;
 845
 846                                                 if (missing & SD_BUS_CREDS_UID)
 847                                                         c->uid = (uid_t) uid;
 848                                                 if (missing & SD_BUS_CREDS_EUID)
 849                                                         c->euid = (uid_t) euid;
 850                                                 if (missing & SD_BUS_CREDS_SUID)
 851                                                         c->suid = (uid_t) suid;
 852                                                 if (missing & SD_BUS_CREDS_FSUID)
 853                                                         c->fsuid = (uid_t) fsuid;
 854
 855                                                 c->mask |= missing & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID);
 856                                                 continue;
 857                                         }
 858                                 }
 859
 860                                 if (missing & (SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID)) {
 861                                         p = startswith(line, "Gid:");
 862                                         if (p) {
 863                                                 unsigned long gid, egid, sgid, fsgid;
 864
 865                                                 p += strspn(p, WHITESPACE);
 866                                                 if (sscanf(p, "%lu %lu %lu %lu", &gid, &egid, &sgid, &fsgid) != 4)
 867                                                         return -EIO;
 868
 869                                                 if (missing & SD_BUS_CREDS_GID)
 870                                                         c->gid = (gid_t) gid;
 871                                                 if (missing & SD_BUS_CREDS_EGID)
 872                                                         c->egid = (gid_t) egid;
 873                                                 if (missing & SD_BUS_CREDS_SGID)
 874                                                         c->sgid = (gid_t) sgid;
 875                                                 if (missing & SD_BUS_CREDS_FSGID)
 876                                                         c->fsgid = (gid_t) fsgid;
 877
 878                                                 c->mask |= missing & (SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID);
 879                                                 continue;
 880                                         }
 881                                 }
 882
 883                                 if (missing & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) {
 884                                         p = startswith(line, "Groups:");
 885                                         if (p) {
 886                                                 size_t allocated = 0;
 887
 888                                                 for (;;) {
 889                                                         unsigned long g;
 890                                                         int n = 0;
 891
 892                                                         p += strspn(p, WHITESPACE);
 893                                                         if (*p == 0)
 894                                                                 break;
 895
 896                                                         if (sscanf(p, "%lu%n", &g, &n) != 1)
 897                                                                 return -EIO;
 898
 899                                                         if (!GREEDY_REALLOC(c->supplementary_gids, allocated, c->n_supplementary_gids+1))
 900                                                                 return -ENOMEM;
 901
 902                                                         c->supplementary_gids[c->n_supplementary_gids++] = (gid_t) g;
 903                                                         p += n;
 904                                                 }
 905
 906                                                 c->mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS;
 907                                                 continue;
 908                                         }
 909                                 }
 910
 911                                 if (missing & SD_BUS_CREDS_EFFECTIVE_CAPS) {
 912                                         p = startswith(line, "CapEff:");
 913                                         if (p) {
 914                                                 r = parse_caps(c, CAP_OFFSET_EFFECTIVE, p);
 915                                                 if (r < 0)
 916                                                         return r;
 917
 918                                                 c->mask |= SD_BUS_CREDS_EFFECTIVE_CAPS;
 919                                                 continue;
 920                                         }
 921                                 }
 922
 923                                 if (missing & SD_BUS_CREDS_PERMITTED_CAPS) {
 924                                         p = startswith(line, "CapPrm:");
 925                                         if (p) {
 926                                                 r = parse_caps(c, CAP_OFFSET_PERMITTED, p);
 927                                                 if (r < 0)
 928                                                         return r;
 929
 930                                                 c->mask |= SD_BUS_CREDS_PERMITTED_CAPS;
 931                                                 continue;
 932                                         }
 933                                 }
 934
 935                                 if (missing & SD_BUS_CREDS_INHERITABLE_CAPS) {
 936                                         p = startswith(line, "CapInh:");
 937                                         if (p) {
 938                                                 r = parse_caps(c, CAP_OFFSET_INHERITABLE, p);
 939                                                 if (r < 0)
 940                                                         return r;
 941
 942                                                 c->mask |= SD_BUS_CREDS_INHERITABLE_CAPS;
 943                                                 continue;
 944                                         }
 945                                 }
 946
 947                                 if (missing & SD_BUS_CREDS_BOUNDING_CAPS) {
 948                                         p = startswith(line, "CapBnd:");
 949                                         if (p) {
 950                                                 r = parse_caps(c, CAP_OFFSET_BOUNDING, p);
 951                                                 if (r < 0)
 952                                                         return r;
 953
 954                                                 c->mask |= SD_BUS_CREDS_BOUNDING_CAPS;
 955                                                 continue;
 956                                         }
 957                                 }
 958                         }
 959                 }
 960         }
 961
 962         if (missing & SD_BUS_CREDS_SELINUX_CONTEXT) {
 963                 const char *p;
 964
 965                 p = procfs_file_alloca(pid, "attr/current");
 966                 r = read_one_line_file(p, &c->label);
 967                 if (r < 0) {
 968                         if (!IN_SET(r, -ENOENT, -EINVAL, -EPERM, -EACCES))
 969                                 return r;
 970                 } else
 971                         c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
 972         }
 973
 974         if (missing & SD_BUS_CREDS_COMM) {
 975                 r = get_process_comm(pid, &c->comm);
 976                 if (r < 0) {
 977                         if (!IN_SET(r, -EPERM, -EACCES))
 978                                 return r;
 979                 } else
 980                         c->mask |= SD_BUS_CREDS_COMM;
 981         }
 982
 983         if (missing & SD_BUS_CREDS_EXE) {
 984                 r = get_process_exe(pid, &c->exe);
 985                 if (r == -ESRCH) {
 986                         /* Unfortunately we cannot really distinguish
 987                          * the case here where the process does not
 988                          * exist, and /proc/$PID/exe being unreadable
 989                          * because $PID is a kernel thread. Hence,
 990                          * assume it is a kernel thread, and rely on
 991                          * that this case is caught with a later
 992                          * call. */
 993                         c->exe = NULL;
 994                         c->mask |= SD_BUS_CREDS_EXE;
 995                 } else if (r < 0) {
 996                         if (!IN_SET(r, -EPERM, -EACCES))
 997                                 return r;
 998                 } else
 999                         c->mask |= SD_BUS_CREDS_EXE;
1000         }
1001
1002         if (missing & SD_BUS_CREDS_CMDLINE) {
1003                 const char *p;
1004
1005                 p = procfs_file_alloca(pid, "cmdline");
1006                 r = read_full_file(p, &c->cmdline, &c->cmdline_size);
1007                 if (r == -ENOENT)
1008                         return -ESRCH;
1009                 if (r < 0) {
1010                         if (!IN_SET(r, -EPERM, -EACCES))
1011                                 return r;
1012                 } else {
1013                         if (c->cmdline_size == 0)
1014                                 c->cmdline = mfree(c->cmdline);
1015
1016                         c->mask |= SD_BUS_CREDS_CMDLINE;
1017                 }
1018         }
1019
1020         if (tid > 0 && (missing & SD_BUS_CREDS_TID_COMM)) {
1021                 _cleanup_free_ char *p = NULL;
1022
1023                 if (asprintf(&p, "/proc/"PID_FMT"/task/"PID_FMT"/comm", pid, tid) < 0)
1024                         return -ENOMEM;
1025
1026                 r = read_one_line_file(p, &c->tid_comm);
1027                 if (r == -ENOENT)
1028                         return -ESRCH;
1029                 if (r < 0) {
1030                         if (!IN_SET(r, -EPERM, -EACCES))
1031                                 return r;
1032                 } else
1033                         c->mask |= SD_BUS_CREDS_TID_COMM;
1034         }
1035
1036         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)) {
1037
1038                 if (!c->cgroup) {
1039                         r = cg_pid_get_path(NULL, pid, &c->cgroup);
1040                         if (r < 0) {
1041                                 if (!IN_SET(r, -EPERM, -EACCES))
1042                                         return r;
1043                         }
1044                 }
1045
1046                 if (!c->cgroup_root) {
1047                         r = cg_get_root_path(&c->cgroup_root);
1048                         if (r < 0)
1049                                 return r;
1050                 }
1051
1052                 if (c->cgroup)
1053                         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);
1054         }
1055
1056         if (missing & SD_BUS_CREDS_AUDIT_SESSION_ID) {
1057                 r = audit_session_from_pid(pid, &c->audit_session_id);
1058                 if (r == -ENODATA) {
1059                         /* ENODATA means: no audit session id assigned */
1060                         c->audit_session_id = AUDIT_SESSION_INVALID;
1061                         c->mask |= SD_BUS_CREDS_AUDIT_SESSION_ID;
1062                 } else if (r < 0) {
1063                         if (!IN_SET(r, -EOPNOTSUPP, -ENOENT, -EPERM, -EACCES))
1064                                 return r;
1065                 } else
1066                         c->mask |= SD_BUS_CREDS_AUDIT_SESSION_ID;
1067         }
1068
1069         if (missing & SD_BUS_CREDS_AUDIT_LOGIN_UID) {
1070                 r = audit_loginuid_from_pid(pid, &c->audit_login_uid);
1071                 if (r == -ENODATA) {
1072                         /* ENODATA means: no audit login uid assigned */
1073                         c->audit_login_uid = UID_INVALID;
1074                         c->mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID;
1075                 } else if (r < 0) {
1076                         if (!IN_SET(r, -EOPNOTSUPP, -ENOENT, -EPERM, -EACCES))
1077                                 return r;
1078                 } else
1079                         c->mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID;
1080         }
1081
1082         if (missing & SD_BUS_CREDS_TTY) {
1083                 r = get_ctty(pid, NULL, &c->tty);
1084                 if (r == -ENXIO) {
1085                         /* ENXIO means: process has no controlling TTY */
1086                         c->tty = NULL;
1087                         c->mask |= SD_BUS_CREDS_TTY;
1088                 } else if (r < 0) {
1089                         if (!IN_SET(r, -EPERM, -EACCES, -ENOENT))
1090                                 return r;
1091                 } else
1092                         c->mask |= SD_BUS_CREDS_TTY;
1093         }
1094
1095         /* In case only the exe path was to be read we cannot
1096          * distinguish the case where the exe path was unreadable
1097          * because the process was a kernel thread, or when the
1098          * process didn't exist at all. Hence, let's do a final check,
1099          * to be sure. */
1100         if (!pid_is_alive(pid))
1101                 return -ESRCH;
1102
1103         if (tid > 0 && tid != pid && !pid_is_unwaited(tid))
1104                 return -ESRCH;
1105
1106         c->augmented = missing & c->mask;
1107
1108         return 0;
1109 }
1110
1111 int bus_creds_extend_by_pid(sd_bus_creds *c, uint64_t mask, sd_bus_creds **ret) {
1112         _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *n = NULL;
1113         int r;
1114
1115         assert(c);
1116         assert(ret);
1117
1118         if ((mask & ~c->mask) == 0 || (!(mask & SD_BUS_CREDS_AUGMENT))) {
1119                 /* There's already all data we need, or augmentation
1120                  * wasn't turned on. */
1121
1122                 *ret = sd_bus_creds_ref(c);
1123                 return 0;
1124         }
1125
1126         n = bus_creds_new();
1127         if (!n)
1128                 return -ENOMEM;
1129
1130         /* Copy the original data over */
1131
1132         if (c->mask & mask & SD_BUS_CREDS_PID) {
1133                 n->pid = c->pid;
1134                 n->mask |= SD_BUS_CREDS_PID;
1135         }
1136
1137         if (c->mask & mask & SD_BUS_CREDS_TID) {
1138                 n->tid = c->tid;
1139                 n->mask |= SD_BUS_CREDS_TID;
1140         }
1141
1142         if (c->mask & mask & SD_BUS_CREDS_PPID) {
1143                 n->ppid = c->ppid;
1144                 n->mask |= SD_BUS_CREDS_PPID;
1145         }
1146
1147         if (c->mask & mask & SD_BUS_CREDS_UID) {
1148                 n->uid = c->uid;
1149                 n->mask |= SD_BUS_CREDS_UID;
1150         }
1151
1152         if (c->mask & mask & SD_BUS_CREDS_EUID) {
1153                 n->euid = c->euid;
1154                 n->mask |= SD_BUS_CREDS_EUID;
1155         }
1156
1157         if (c->mask & mask & SD_BUS_CREDS_SUID) {
1158                 n->suid = c->suid;
1159                 n->mask |= SD_BUS_CREDS_SUID;
1160         }
1161
1162         if (c->mask & mask & SD_BUS_CREDS_FSUID) {
1163                 n->fsuid = c->fsuid;
1164                 n->mask |= SD_BUS_CREDS_FSUID;
1165         }
1166
1167         if (c->mask & mask & SD_BUS_CREDS_GID) {
1168                 n->gid = c->gid;
1169                 n->mask |= SD_BUS_CREDS_GID;
1170         }
1171
1172         if (c->mask & mask & SD_BUS_CREDS_EGID) {
1173                 n->egid = c->egid;
1174                 n->mask |= SD_BUS_CREDS_EGID;
1175         }
1176
1177         if (c->mask & mask & SD_BUS_CREDS_SGID) {
1178                 n->sgid = c->sgid;
1179                 n->mask |= SD_BUS_CREDS_SGID;
1180         }
1181
1182         if (c->mask & mask & SD_BUS_CREDS_FSGID) {
1183                 n->fsgid = c->fsgid;
1184                 n->mask |= SD_BUS_CREDS_FSGID;
1185         }
1186
1187         if (c->mask & mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) {
1188                 if (c->supplementary_gids) {
1189                         n->supplementary_gids = newdup(gid_t, c->supplementary_gids, c->n_supplementary_gids);
1190                         if (!n->supplementary_gids)
1191                                 return -ENOMEM;
1192                         n->n_supplementary_gids = c->n_supplementary_gids;
1193                 } else {
1194                         n->supplementary_gids = NULL;
1195                         n->n_supplementary_gids = 0;
1196                 }
1197
1198                 n->mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS;
1199         }
1200
1201         if (c->mask & mask & SD_BUS_CREDS_COMM) {
1202                 assert(c->comm);
1203
1204                 n->comm = strdup(c->comm);
1205                 if (!n->comm)
1206                         return -ENOMEM;
1207
1208                 n->mask |= SD_BUS_CREDS_COMM;
1209         }
1210
1211         if (c->mask & mask & SD_BUS_CREDS_TID_COMM) {
1212                 assert(c->tid_comm);
1213
1214                 n->tid_comm = strdup(c->tid_comm);
1215                 if (!n->tid_comm)
1216                         return -ENOMEM;
1217
1218                 n->mask |= SD_BUS_CREDS_TID_COMM;
1219         }
1220
1221         if (c->mask & mask & SD_BUS_CREDS_EXE) {
1222                 if (c->exe) {
1223                         n->exe = strdup(c->exe);
1224                         if (!n->exe)
1225                                 return -ENOMEM;
1226                 } else
1227                         n->exe = NULL;
1228
1229                 n->mask |= SD_BUS_CREDS_EXE;
1230         }
1231
1232         if (c->mask & mask & SD_BUS_CREDS_CMDLINE) {
1233                 if (c->cmdline) {
1234                         n->cmdline = memdup(c->cmdline, c->cmdline_size);
1235                         if (!n->cmdline)
1236                                 return -ENOMEM;
1237
1238                         n->cmdline_size = c->cmdline_size;
1239                 } else {
1240                         n->cmdline = NULL;
1241                         n->cmdline_size = 0;
1242                 }
1243
1244                 n->mask |= SD_BUS_CREDS_CMDLINE;
1245         }
1246
1247         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)) {
1248                 assert(c->cgroup);
1249
1250                 n->cgroup = strdup(c->cgroup);
1251                 if (!n->cgroup)
1252                         return -ENOMEM;
1253
1254                 n->cgroup_root = strdup(c->cgroup_root);
1255                 if (!n->cgroup_root)
1256                         return -ENOMEM;
1257
1258                 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);
1259         }
1260
1261         if (c->mask & mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS)) {
1262                 assert(c->capability);
1263
1264                 n->capability = memdup(c->capability, DIV_ROUND_UP(cap_last_cap()+1, 32U) * 4 * 4);
1265                 if (!n->capability)
1266                         return -ENOMEM;
1267
1268                 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);
1269         }
1270
1271         if (c->mask & mask & SD_BUS_CREDS_SELINUX_CONTEXT) {
1272                 assert(c->label);
1273
1274                 n->label = strdup(c->label);
1275                 if (!n->label)
1276                         return -ENOMEM;
1277                 n->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
1278         }
1279
1280         if (c->mask & mask & SD_BUS_CREDS_AUDIT_SESSION_ID) {
1281                 n->audit_session_id = c->audit_session_id;
1282                 n->mask |= SD_BUS_CREDS_AUDIT_SESSION_ID;
1283         }
1284         if (c->mask & mask & SD_BUS_CREDS_AUDIT_LOGIN_UID) {
1285                 n->audit_login_uid = c->audit_login_uid;
1286                 n->mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID;
1287         }
1288
1289         if (c->mask & mask & SD_BUS_CREDS_TTY) {
1290                 if (c->tty) {
1291                         n->tty = strdup(c->tty);
1292                         if (!n->tty)
1293                                 return -ENOMEM;
1294                 } else
1295                         n->tty = NULL;
1296                 n->mask |= SD_BUS_CREDS_TTY;
1297         }
1298
1299         if (c->mask & mask & SD_BUS_CREDS_UNIQUE_NAME) {
1300                 assert(c->unique_name);
1301
1302                 n->unique_name = strdup(c->unique_name);
1303                 if (!n->unique_name)
1304                         return -ENOMEM;
1305                 n->mask |= SD_BUS_CREDS_UNIQUE_NAME;
1306         }
1307
1308         if (c->mask & mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) {
1309                 if (strv_isempty(c->well_known_names))
1310                         n->well_known_names = NULL;
1311                 else {
1312                         n->well_known_names = strv_copy(c->well_known_names);
1313                         if (!n->well_known_names)
1314                                 return -ENOMEM;
1315                 }
1316                 n->well_known_names_driver = c->well_known_names_driver;
1317                 n->well_known_names_local = c->well_known_names_local;
1318                 n->mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES;
1319         }
1320
1321         if (c->mask & mask & SD_BUS_CREDS_DESCRIPTION) {
1322                 assert(c->description);
1323                 n->description = strdup(c->description);
1324                 if (!n->description)
1325                         return -ENOMEM;
1326                 n->mask |= SD_BUS_CREDS_DESCRIPTION;
1327         }
1328
1329         n->augmented = c->augmented & n->mask;
1330
1331         /* Get more data */
1332
1333         r = bus_creds_add_more(n, mask, 0, 0);
1334         if (r < 0)
1335                 return r;
1336
1337         *ret = TAKE_PTR(n);
1338
1339         return 0;
1340 }