src/nspawn/nspawn.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <signal.h>
  23 #include <sched.h>
  24 #include <unistd.h>
  25 #include <sys/types.h>
  26 #include <sys/syscall.h>
  27 #include <sys/mount.h>
  28 #include <sys/wait.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <stdio.h>
  32 #include <errno.h>
  33 #include <sys/prctl.h>
  34 #include <sys/capability.h>
  35 #include <getopt.h>
  36 #include <termios.h>
  37 #include <sys/signalfd.h>
  38 #include <grp.h>
  39 #include <linux/fs.h>
  40 #include <sys/un.h>
  41 #include <sys/socket.h>
  42 #include <linux/netlink.h>
  43 #include <sys/eventfd.h>
  44 #include <net/if.h>
  45 #include <linux/veth.h>
  46 #include <sys/personality.h>
  47 #include <linux/loop.h>
  48
  49 #ifdef HAVE_SELINUX
  50 #include <selinux/selinux.h>
  51 #endif
  52
  53 #ifdef HAVE_SECCOMP
  54 #include <seccomp.h>
  55 #endif
  56
  57 #ifdef HAVE_BLKID
  58 #include <blkid/blkid.h>
  59 #endif
  60
  61 #include "sd-daemon.h"
  62 #include "sd-bus.h"
  63 #include "sd-id128.h"
  64 #include "sd-rtnl.h"
  65 #include "log.h"
  66 #include "util.h"
  67 #include "mkdir.h"
  68 #include "macro.h"
  69 #include "audit.h"
  70 #include "missing.h"
  71 #include "cgroup-util.h"
  72 #include "strv.h"
  73 #include "path-util.h"
  74 #include "loopback-setup.h"
  75 #include "dev-setup.h"
  76 #include "fdset.h"
  77 #include "build.h"
  78 #include "fileio.h"
  79 #include "bus-util.h"
  80 #include "bus-error.h"
  81 #include "ptyfwd.h"
  82 #include "bus-kernel.h"
  83 #include "env-util.h"
  84 #include "def.h"
  85 #include "rtnl-util.h"
  86 #include "udev-util.h"
  87 #include "blkid-util.h"
  88 #include "gpt.h"
  89 #include "siphash24.h"
  90
  91 #ifdef HAVE_SECCOMP
  92 #include "seccomp-util.h"
  93 #endif
  94
  95 typedef enum LinkJournal {
  96         LINK_NO,
  97         LINK_AUTO,
  98         LINK_HOST,
  99         LINK_GUEST
 100 } LinkJournal;
 101
 102 static char *arg_directory = NULL;
 103 static char *arg_user = NULL;
 104 static sd_id128_t arg_uuid = {};
 105 static char *arg_machine = NULL;
 106 static const char *arg_selinux_context = NULL;
 107 static const char *arg_selinux_apifs_context = NULL;
 108 static const char *arg_slice = NULL;
 109 static bool arg_private_network = false;
 110 static bool arg_read_only = false;
 111 static bool arg_boot = false;
 112 static LinkJournal arg_link_journal = LINK_AUTO;
 113 static uint64_t arg_retain =
 114         (1ULL << CAP_CHOWN) |
 115         (1ULL << CAP_DAC_OVERRIDE) |
 116         (1ULL << CAP_DAC_READ_SEARCH) |
 117         (1ULL << CAP_FOWNER) |
 118         (1ULL << CAP_FSETID) |
 119         (1ULL << CAP_IPC_OWNER) |
 120         (1ULL << CAP_KILL) |
 121         (1ULL << CAP_LEASE) |
 122         (1ULL << CAP_LINUX_IMMUTABLE) |
 123         (1ULL << CAP_NET_BIND_SERVICE) |
 124         (1ULL << CAP_NET_BROADCAST) |
 125         (1ULL << CAP_NET_RAW) |
 126         (1ULL << CAP_SETGID) |
 127         (1ULL << CAP_SETFCAP) |
 128         (1ULL << CAP_SETPCAP) |
 129         (1ULL << CAP_SETUID) |
 130         (1ULL << CAP_SYS_ADMIN) |
 131         (1ULL << CAP_SYS_CHROOT) |
 132         (1ULL << CAP_SYS_NICE) |
 133         (1ULL << CAP_SYS_PTRACE) |
 134         (1ULL << CAP_SYS_TTY_CONFIG) |
 135         (1ULL << CAP_SYS_RESOURCE) |
 136         (1ULL << CAP_SYS_BOOT) |
 137         (1ULL << CAP_AUDIT_WRITE) |
 138         (1ULL << CAP_AUDIT_CONTROL) |
 139         (1ULL << CAP_MKNOD);
 140 static char **arg_bind = NULL;
 141 static char **arg_bind_ro = NULL;
 142 static char **arg_setenv = NULL;
 143 static bool arg_quiet = false;
 144 static bool arg_share_system = false;
 145 static bool arg_register = true;
 146 static bool arg_keep_unit = false;
 147 static char **arg_network_interfaces = NULL;
 148 static char **arg_network_macvlan = NULL;
 149 static bool arg_network_veth = false;
 150 static const char *arg_network_bridge = NULL;
 151 static unsigned long arg_personality = 0xffffffffLU;
 152 static const char *arg_image = NULL;
 153
 154 static int help(void) {
 155
 156         printf("%s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n"
 157                "Spawn a minimal namespace container for debugging, testing and building.\n\n"
 158                "  -h --help                 Show this help\n"
 159                "     --version              Print version string\n"
 160                "  -q --quiet                Do not show status information\n"
 161                "  -D --directory=PATH       Root directory for the container\n"
 162                "  -i --image=PATH           File system device or image for the container\n"
 163                "  -b --boot                 Boot up full system (i.e. invoke init)\n"
 164                "  -u --user=USER            Run the command under specified user or uid\n"
 165                "  -M --machine=NAME         Set the machine name for the container\n"
 166                "     --uuid=UUID            Set a specific machine UUID for the container\n"
 167                "  -S --slice=SLICE          Place the container in the specified slice\n"
 168                "     --private-network      Disable network in container\n"
 169                "     --network-interface=INTERFACE\n"
 170                "                            Assign an existing network interface to the\n"
 171                "                            container\n"
 172                "     --network-macvlan=INTERFACE\n"
 173                "                            Create a macvlan network interface based on an\n"
 174                "                            existing network interface to the container\n"
 175                "     --network-veth         Add a virtual ethernet connection between host\n"
 176                "                            and container\n"
 177                "     --network-bridge=INTERFACE\n"
 178                "                            Add a virtual ethernet connection between host\n"
 179                "                            and container and add it to an existing bridge on\n"
 180                "                            the host\n"
 181                "  -Z --selinux-context=SECLABEL\n"
 182                "                            Set the SELinux security context to be used by\n"
 183                "                            processes in the container\n"
 184                "  -L --selinux-apifs-context=SECLABEL\n"
 185                "                            Set the SELinux security context to be used by\n"
 186                "                            API/tmpfs file systems in the container\n"
 187                "     --capability=CAP       In addition to the default, retain specified\n"
 188                "                            capability\n"
 189                "     --drop-capability=CAP  Drop the specified capability from the default set\n"
 190                "     --link-journal=MODE    Link up guest journal, one of no, auto, guest, host\n"
 191                "  -j                        Equivalent to --link-journal=host\n"
 192                "     --read-only            Mount the root directory read-only\n"
 193                "     --bind=PATH[:PATH]     Bind mount a file or directory from the host into\n"
 194                "                            the container\n"
 195                "     --bind-ro=PATH[:PATH]  Similar, but creates a read-only bind mount\n"
 196                "     --setenv=NAME=VALUE    Pass an environment variable to PID 1\n"
 197                "     --share-system         Share system namespaces with host\n"
 198                "     --register=BOOLEAN     Register container as machine\n"
 199                "     --keep-unit            Do not register a scope for the machine, reuse\n"
 200                "                            the service unit nspawn is running in\n",
 201                program_invocation_short_name);
 202
 203         return 0;
 204 }
 205
 206 static int parse_argv(int argc, char *argv[]) {
 207
 208         enum {
 209                 ARG_VERSION = 0x100,
 210                 ARG_PRIVATE_NETWORK,
 211                 ARG_UUID,
 212                 ARG_READ_ONLY,
 213                 ARG_CAPABILITY,
 214                 ARG_DROP_CAPABILITY,
 215                 ARG_LINK_JOURNAL,
 216                 ARG_BIND,
 217                 ARG_BIND_RO,
 218                 ARG_SETENV,
 219                 ARG_SHARE_SYSTEM,
 220                 ARG_REGISTER,
 221                 ARG_KEEP_UNIT,
 222                 ARG_NETWORK_INTERFACE,
 223                 ARG_NETWORK_MACVLAN,
 224                 ARG_NETWORK_VETH,
 225                 ARG_NETWORK_BRIDGE,
 226                 ARG_PERSONALITY,
 227         };
 228
 229         static const struct option options[] = {
 230                 { "help",                  no_argument,       NULL, 'h'                   },
 231                 { "version",               no_argument,       NULL, ARG_VERSION           },
 232                 { "directory",             required_argument, NULL, 'D'                   },
 233                 { "user",                  required_argument, NULL, 'u'                   },
 234                 { "private-network",       no_argument,       NULL, ARG_PRIVATE_NETWORK   },
 235                 { "boot",                  no_argument,       NULL, 'b'                   },
 236                 { "uuid",                  required_argument, NULL, ARG_UUID              },
 237                 { "read-only",             no_argument,       NULL, ARG_READ_ONLY         },
 238                 { "capability",            required_argument, NULL, ARG_CAPABILITY        },
 239                 { "drop-capability",       required_argument, NULL, ARG_DROP_CAPABILITY   },
 240                 { "link-journal",          required_argument, NULL, ARG_LINK_JOURNAL      },
 241                 { "bind",                  required_argument, NULL, ARG_BIND              },
 242                 { "bind-ro",               required_argument, NULL, ARG_BIND_RO           },
 243                 { "machine",               required_argument, NULL, 'M'                   },
 244                 { "slice",                 required_argument, NULL, 'S'                   },
 245                 { "setenv",                required_argument, NULL, ARG_SETENV            },
 246                 { "selinux-context",       required_argument, NULL, 'Z'                   },
 247                 { "selinux-apifs-context", required_argument, NULL, 'L'                   },
 248                 { "quiet",                 no_argument,       NULL, 'q'                   },
 249                 { "share-system",          no_argument,       NULL, ARG_SHARE_SYSTEM      },
 250                 { "register",              required_argument, NULL, ARG_REGISTER          },
 251                 { "keep-unit",             no_argument,       NULL, ARG_KEEP_UNIT         },
 252                 { "network-interface",     required_argument, NULL, ARG_NETWORK_INTERFACE },
 253                 { "network-macvlan",       required_argument, NULL, ARG_NETWORK_MACVLAN   },
 254                 { "network-veth",          no_argument,       NULL, ARG_NETWORK_VETH      },
 255                 { "network-bridge",        required_argument, NULL, ARG_NETWORK_BRIDGE    },
 256                 { "personality",           required_argument, NULL, ARG_PERSONALITY       },
 257                 { "image",                 required_argument, NULL, 'i'                   },
 258                 {}
 259         };
 260
 261         int c, r;
 262         uint64_t plus = 0, minus = 0;
 263
 264         assert(argc >= 0);
 265         assert(argv);
 266
 267         while ((c = getopt_long(argc, argv, "+hD:u:bL:M:jS:Z:qi:", options, NULL)) >= 0) {
 268
 269                 switch (c) {
 270
 271                 case 'h':
 272                         return help();
 273
 274                 case ARG_VERSION:
 275                         puts(PACKAGE_STRING);
 276                         puts(SYSTEMD_FEATURES);
 277                         return 0;
 278
 279                 case 'D':
 280                         free(arg_directory);
 281                         arg_directory = canonicalize_file_name(optarg);
 282                         if (!arg_directory) {
 283                                 log_error("Invalid root directory: %m");
 284                                 return -ENOMEM;
 285                         }
 286
 287                         break;
 288
 289                 case 'i':
 290                         arg_image = optarg;
 291                         break;
 292
 293                 case 'u':
 294                         free(arg_user);
 295                         arg_user = strdup(optarg);
 296                         if (!arg_user)
 297                                 return log_oom();
 298
 299                         break;
 300
 301                 case ARG_NETWORK_BRIDGE:
 302                         arg_network_bridge = optarg;
 303
 304                         /* fall through */
 305
 306                 case ARG_NETWORK_VETH:
 307                         arg_network_veth = true;
 308                         arg_private_network = true;
 309                         break;
 310
 311                 case ARG_NETWORK_INTERFACE:
 312                         if (strv_extend(&arg_network_interfaces, optarg) < 0)
 313                                 return log_oom();
 314
 315                         arg_private_network = true;
 316                         break;
 317
 318                 case ARG_NETWORK_MACVLAN:
 319                         if (strv_extend(&arg_network_macvlan, optarg) < 0)
 320                                 return log_oom();
 321
 322                         /* fall through */
 323
 324                 case ARG_PRIVATE_NETWORK:
 325                         arg_private_network = true;
 326                         break;
 327
 328                 case 'b':
 329                         arg_boot = true;
 330                         break;
 331
 332                 case ARG_UUID:
 333                         r = sd_id128_from_string(optarg, &arg_uuid);
 334                         if (r < 0) {
 335                                 log_error("Invalid UUID: %s", optarg);
 336                                 return r;
 337                         }
 338                         break;
 339
 340                 case 'S':
 341                         arg_slice = optarg;
 342                         break;
 343
 344                 case 'M':
 345                         if (isempty(optarg)) {
 346                                 free(arg_machine);
 347                                 arg_machine = NULL;
 348                         } else {
 349
 350                                 if (!hostname_is_valid(optarg)) {
 351                                         log_error("Invalid machine name: %s", optarg);
 352                                         return -EINVAL;
 353                                 }
 354
 355                                 free(arg_machine);
 356                                 arg_machine = strdup(optarg);
 357                                 if (!arg_machine)
 358                                         return log_oom();
 359
 360                                 break;
 361                         }
 362
 363                 case 'Z':
 364                         arg_selinux_context = optarg;
 365                         break;
 366
 367                 case 'L':
 368                         arg_selinux_apifs_context = optarg;
 369                         break;
 370
 371                 case ARG_READ_ONLY:
 372                         arg_read_only = true;
 373                         break;
 374
 375                 case ARG_CAPABILITY:
 376                 case ARG_DROP_CAPABILITY: {
 377                         char *state, *word;
 378                         size_t length;
 379
 380                         FOREACH_WORD_SEPARATOR(word, length, optarg, ",", state) {
 381                                 _cleanup_free_ char *t;
 382                                 cap_value_t cap;
 383
 384                                 t = strndup(word, length);
 385                                 if (!t)
 386                                         return log_oom();
 387
 388                                 if (streq(t, "all")) {
 389                                         if (c == ARG_CAPABILITY)
 390                                                 plus = (uint64_t) -1;
 391                                         else
 392                                                 minus = (uint64_t) -1;
 393                                 } else {
 394                                         if (cap_from_name(t, &cap) < 0) {
 395                                                 log_error("Failed to parse capability %s.", t);
 396                                                 return -EINVAL;
 397                                         }
 398
 399                                         if (c == ARG_CAPABILITY)
 400                                                 plus |= 1ULL << (uint64_t) cap;
 401                                         else
 402                                                 minus |= 1ULL << (uint64_t) cap;
 403                                 }
 404                         }
 405
 406                         break;
 407                 }
 408
 409                 case 'j':
 410                         arg_link_journal = LINK_GUEST;
 411                         break;
 412
 413                 case ARG_LINK_JOURNAL:
 414                         if (streq(optarg, "auto"))
 415                                 arg_link_journal = LINK_AUTO;
 416                         else if (streq(optarg, "no"))
 417                                 arg_link_journal = LINK_NO;
 418                         else if (streq(optarg, "guest"))
 419                                 arg_link_journal = LINK_GUEST;
 420                         else if (streq(optarg, "host"))
 421                                 arg_link_journal = LINK_HOST;
 422                         else {
 423                                 log_error("Failed to parse link journal mode %s", optarg);
 424                                 return -EINVAL;
 425                         }
 426
 427                         break;
 428
 429                 case ARG_BIND:
 430                 case ARG_BIND_RO: {
 431                         _cleanup_free_ char *a = NULL, *b = NULL;
 432                         char *e;
 433                         char ***x;
 434
 435                         x = c == ARG_BIND ? &arg_bind : &arg_bind_ro;
 436
 437                         e = strchr(optarg, ':');
 438                         if (e) {
 439                                 a = strndup(optarg, e - optarg);
 440                                 b = strdup(e + 1);
 441                         } else {
 442                                 a = strdup(optarg);
 443                                 b = strdup(optarg);
 444                         }
 445
 446                         if (!a || !b)
 447                                 return log_oom();
 448
 449                         if (!path_is_absolute(a) || !path_is_absolute(b)) {
 450                                 log_error("Invalid bind mount specification: %s", optarg);
 451                                 return -EINVAL;
 452                         }
 453
 454                         r = strv_extend(x, a);
 455                         if (r < 0)
 456                                 return log_oom();
 457
 458                         r = strv_extend(x, b);
 459                         if (r < 0)
 460                                 return log_oom();
 461
 462                         break;
 463                 }
 464
 465                 case ARG_SETENV: {
 466                         char **n;
 467
 468                         if (!env_assignment_is_valid(optarg)) {
 469                                 log_error("Environment variable assignment '%s' is not valid.", optarg);
 470                                 return -EINVAL;
 471                         }
 472
 473                         n = strv_env_set(arg_setenv, optarg);
 474                         if (!n)
 475                                 return log_oom();
 476
 477                         strv_free(arg_setenv);
 478                         arg_setenv = n;
 479                         break;
 480                 }
 481
 482                 case 'q':
 483                         arg_quiet = true;
 484                         break;
 485
 486                 case ARG_SHARE_SYSTEM:
 487                         arg_share_system = true;
 488                         break;
 489
 490                 case ARG_REGISTER:
 491                         r = parse_boolean(optarg);
 492                         if (r < 0) {
 493                                 log_error("Failed to parse --register= argument: %s", optarg);
 494                                 return r;
 495                         }
 496
 497                         arg_register = r;
 498                         break;
 499
 500                 case ARG_KEEP_UNIT:
 501                         arg_keep_unit = true;
 502                         break;
 503
 504                 case ARG_PERSONALITY:
 505
 506                         arg_personality = personality_from_string(optarg);
 507                         if (arg_personality == 0xffffffffLU) {
 508                                 log_error("Unknown or unsupported personality '%s'.", optarg);
 509                                 return -EINVAL;
 510                         }
 511
 512                         break;
 513
 514                 case '?':
 515                         return -EINVAL;
 516
 517                 default:
 518                         assert_not_reached("Unhandled option");
 519                 }
 520         }
 521
 522         if (arg_share_system)
 523                 arg_register = false;
 524
 525         if (arg_boot && arg_share_system) {
 526                 log_error("--boot and --share-system may not be combined.");
 527                 return -EINVAL;
 528         }
 529
 530         if (arg_keep_unit && cg_pid_get_owner_uid(0, NULL) >= 0) {
 531                 log_error("--keep-unit may not be used when invoked from a user session.");
 532                 return -EINVAL;
 533         }
 534
 535         if (arg_directory && arg_image) {
 536                 log_error("--directory= and --image= may not be combined.");
 537                 return -EINVAL;
 538         }
 539
 540         arg_retain = (arg_retain | plus | (arg_private_network ? 1ULL << CAP_NET_ADMIN : 0)) & ~minus;
 541
 542         return 1;
 543 }
 544
 545 static int mount_all(const char *dest) {
 546
 547         typedef struct MountPoint {
 548                 const char *what;
 549                 const char *where;
 550                 const char *type;
 551                 const char *options;
 552                 unsigned long flags;
 553                 bool fatal;
 554         } MountPoint;
 555
 556         static const MountPoint mount_table[] = {
 557                 { "proc",      "/proc",     "proc",  NULL,       MS_NOSUID|MS_NOEXEC|MS_NODEV, true  },
 558                 { "/proc/sys", "/proc/sys", NULL,    NULL,       MS_BIND, true                       },   /* Bind mount first */
 559                 { NULL,        "/proc/sys", NULL,    NULL,       MS_BIND|MS_RDONLY|MS_REMOUNT, true  },   /* Then, make it r/o */
 560                 { "sysfs",     "/sys",      "sysfs", NULL,       MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, true  },
 561                 { "tmpfs",     "/dev",      "tmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME,     true  },
 562                 { "devpts",    "/dev/pts",  "devpts","newinstance,ptmxmode=0666,mode=620,gid=" STRINGIFY(TTY_GID), MS_NOSUID|MS_NOEXEC, true },
 563                 { "tmpfs",     "/dev/shm",  "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true  },
 564                 { "tmpfs",     "/run",      "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true  },
 565 #ifdef HAVE_SELINUX
 566                 { "/sys/fs/selinux", "/sys/fs/selinux", NULL, NULL, MS_BIND,                      false },  /* Bind mount first */
 567                 { NULL,              "/sys/fs/selinux", NULL, NULL, MS_BIND|MS_RDONLY|MS_REMOUNT, false },  /* Then, make it r/o */
 568 #endif
 569         };
 570
 571         unsigned k;
 572         int r = 0;
 573
 574         for (k = 0; k < ELEMENTSOF(mount_table); k++) {
 575                 _cleanup_free_ char *where = NULL;
 576 #ifdef HAVE_SELINUX
 577                 _cleanup_free_ char *options = NULL;
 578 #endif
 579                 const char *o;
 580                 int t;
 581
 582                 where = strjoin(dest, "/", mount_table[k].where, NULL);
 583                 if (!where)
 584                         return log_oom();
 585
 586                 t = path_is_mount_point(where, true);
 587                 if (t < 0) {
 588                         log_error("Failed to detect whether %s is a mount point: %s", where, strerror(-t));
 589
 590                         if (r == 0)
 591                                 r = t;
 592
 593                         continue;
 594                 }
 595
 596                 /* Skip this entry if it is not a remount. */
 597                 if (mount_table[k].what && t > 0)
 598                         continue;
 599
 600                 mkdir_p(where, 0755);
 601
 602 #ifdef HAVE_SELINUX
 603                 if (arg_selinux_apifs_context &&
 604                     (streq_ptr(mount_table[k].what, "tmpfs") || streq_ptr(mount_table[k].what, "devpts"))) {
 605                         options = strjoin(mount_table[k].options, ",context=\"", arg_selinux_apifs_context, "\"", NULL);
 606                         if (!options)
 607                                 return log_oom();
 608
 609                         o = options;
 610                 } else
 611 #endif
 612                         o = mount_table[k].options;
 613
 614
 615                 if (mount(mount_table[k].what,
 616                           where,
 617                           mount_table[k].type,
 618                           mount_table[k].flags,
 619                           o) < 0 &&
 620                     mount_table[k].fatal) {
 621
 622                         log_error("mount(%s) failed: %m", where);
 623
 624                         if (r == 0)
 625                                 r = -errno;
 626                 }
 627         }
 628
 629         return r;
 630 }
 631
 632 static int mount_binds(const char *dest, char **l, unsigned long flags) {
 633         char **x, **y;
 634
 635         STRV_FOREACH_PAIR(x, y, l) {
 636                 char *where;
 637                 struct stat source_st, dest_st;
 638                 int r;
 639
 640                 if (stat(*x, &source_st) < 0) {
 641                         log_error("Failed to stat %s: %m", *x);
 642                         return -errno;
 643                 }
 644
 645                 where = strappenda(dest, *y);
 646                 r = stat(where, &dest_st);
 647                 if (r == 0) {
 648                         if ((source_st.st_mode & S_IFMT) != (dest_st.st_mode & S_IFMT)) {
 649                                 log_error("The file types of %s and %s do not match. Refusing bind mount",
 650                                                 *x, where);
 651                                 return -EINVAL;
 652                         }
 653                 } else if (errno == ENOENT) {
 654                         r = mkdir_parents_label(where, 0755);
 655                         if (r < 0) {
 656                                 log_error("Failed to bind mount %s: %s", *x, strerror(-r));
 657                                 return r;
 658                         }
 659                 } else {
 660                         log_error("Failed to bind mount %s: %s", *x, strerror(errno));
 661                         return -errno;
 662                 }
 663                 /* Create the mount point, but be conservative -- refuse to create block
 664                 * and char devices. */
 665                 if (S_ISDIR(source_st.st_mode))
 666                         mkdir_label(where, 0755);
 667                 else if (S_ISFIFO(source_st.st_mode))
 668                         mkfifo(where, 0644);
 669                 else if (S_ISSOCK(source_st.st_mode))
 670                         mknod(where, 0644 | S_IFSOCK, 0);
 671                 else if (S_ISREG(source_st.st_mode))
 672                         touch(where);
 673                 else {
 674                         log_error("Refusing to create mountpoint for file: %s", *x);
 675                         return -ENOTSUP;
 676                 }
 677
 678                 if (mount(*x, where, "bind", MS_BIND, NULL) < 0) {
 679                         log_error("mount(%s) failed: %m", where);
 680                         return -errno;
 681                 }
 682
 683                 if (flags && mount(NULL, where, NULL, MS_REMOUNT|MS_BIND|flags, NULL) < 0) {
 684                         log_error("mount(%s) failed: %m", where);
 685                         return -errno;
 686                 }
 687         }
 688
 689         return 0;
 690 }
 691
 692 static int setup_timezone(const char *dest) {
 693         _cleanup_free_ char *where = NULL, *p = NULL, *q = NULL, *check = NULL, *what = NULL;
 694         char *z, *y;
 695         int r;
 696
 697         assert(dest);
 698
 699         /* Fix the timezone, if possible */
 700         r = readlink_malloc("/etc/localtime", &p);
 701         if (r < 0) {
 702                 log_warning("/etc/localtime is not a symlink, not updating container timezone.");
 703                 return 0;
 704         }
 705
 706         z = path_startswith(p, "../usr/share/zoneinfo/");
 707         if (!z)
 708                 z = path_startswith(p, "/usr/share/zoneinfo/");
 709         if (!z) {
 710                 log_warning("/etc/localtime does not point into /usr/share/zoneinfo/, not updating container timezone.");
 711                 return 0;
 712         }
 713
 714         where = strappend(dest, "/etc/localtime");
 715         if (!where)
 716                 return log_oom();
 717
 718         r = readlink_malloc(where, &q);
 719         if (r >= 0) {
 720                 y = path_startswith(q, "../usr/share/zoneinfo/");
 721                 if (!y)
 722                         y = path_startswith(q, "/usr/share/zoneinfo/");
 723
 724
 725                 /* Already pointing to the right place? Then do nothing .. */
 726                 if (y && streq(y, z))
 727                         return 0;
 728         }
 729
 730         check = strjoin(dest, "/usr/share/zoneinfo/", z, NULL);
 731         if (!check)
 732                 return log_oom();
 733
 734         if (access(check, F_OK) < 0) {
 735                 log_warning("Timezone %s does not exist in container, not updating container timezone.", z);
 736                 return 0;
 737         }
 738
 739         what = strappend("../usr/share/zoneinfo/", z);
 740         if (!what)
 741                 return log_oom();
 742
 743         unlink(where);
 744         if (symlink(what, where) < 0) {
 745                 log_error("Failed to correct timezone of container: %m");
 746                 return 0;
 747         }
 748
 749         return 0;
 750 }
 751
 752 static int setup_resolv_conf(const char *dest) {
 753         char _cleanup_free_ *where = NULL;
 754
 755         assert(dest);
 756
 757         if (arg_private_network)
 758                 return 0;
 759
 760         /* Fix resolv.conf, if possible */
 761         where = strappend(dest, "/etc/resolv.conf");
 762         if (!where)
 763                 return log_oom();
 764
 765         /* We don't really care for the results of this really. If it
 766          * fails, it fails, but meh... */
 767         copy_file("/etc/resolv.conf", where, O_TRUNC|O_NOFOLLOW);
 768
 769         return 0;
 770 }
 771
 772 static int setup_boot_id(const char *dest) {
 773         _cleanup_free_ char *from = NULL, *to = NULL;
 774         sd_id128_t rnd = {};
 775         char as_uuid[37];
 776         int r;
 777
 778         assert(dest);
 779
 780         if (arg_share_system)
 781                 return 0;
 782
 783         /* Generate a new randomized boot ID, so that each boot-up of
 784          * the container gets a new one */
 785
 786         from = strappend(dest, "/dev/proc-sys-kernel-random-boot-id");
 787         to = strappend(dest, "/proc/sys/kernel/random/boot_id");
 788         if (!from || !to)
 789                 return log_oom();
 790
 791         r = sd_id128_randomize(&rnd);
 792         if (r < 0) {
 793                 log_error("Failed to generate random boot id: %s", strerror(-r));
 794                 return r;
 795         }
 796
 797         snprintf(as_uuid, sizeof(as_uuid),
 798                  "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
 799                  SD_ID128_FORMAT_VAL(rnd));
 800         char_array_0(as_uuid);
 801
 802         r = write_string_file(from, as_uuid);
 803         if (r < 0) {
 804                 log_error("Failed to write boot id: %s", strerror(-r));
 805                 return r;
 806         }
 807
 808         if (mount(from, to, "bind", MS_BIND, NULL) < 0) {
 809                 log_error("Failed to bind mount boot id: %m");
 810                 r = -errno;
 811         } else if (mount(from, to, "bind", MS_BIND|MS_REMOUNT|MS_RDONLY, NULL))
 812                 log_warning("Failed to make boot id read-only: %m");
 813
 814         unlink(from);
 815         return r;
 816 }
 817
 818 static int copy_devnodes(const char *dest) {
 819
 820         static const char devnodes[] =
 821                 "null\0"
 822                 "zero\0"
 823                 "full\0"
 824                 "random\0"
 825                 "urandom\0"
 826                 "tty\0";
 827
 828         const char *d;
 829         int r = 0;
 830         _cleanup_umask_ mode_t u;
 831
 832         assert(dest);
 833
 834         u = umask(0000);
 835
 836         NULSTR_FOREACH(d, devnodes) {
 837                 _cleanup_free_ char *from = NULL, *to = NULL;
 838                 struct stat st;
 839
 840                 from = strappend("/dev/", d);
 841                 to = strjoin(dest, "/dev/", d, NULL);
 842                 if (!from || !to)
 843                         return log_oom();
 844
 845                 if (stat(from, &st) < 0) {
 846
 847                         if (errno != ENOENT) {
 848                                 log_error("Failed to stat %s: %m", from);
 849                                 return -errno;
 850                         }
 851
 852                 } else if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) {
 853
 854                         log_error("%s is not a char or block device, cannot copy", from);
 855                         return -EIO;
 856
 857                 } else if (mknod(to, st.st_mode, st.st_rdev) < 0) {
 858
 859                         log_error("mknod(%s) failed: %m", dest);
 860                         return  -errno;
 861                 }
 862         }
 863
 864         return r;
 865 }
 866
 867 static int setup_ptmx(const char *dest) {
 868         _cleanup_free_ char *p = NULL;
 869
 870         p = strappend(dest, "/dev/ptmx");
 871         if (!p)
 872                 return log_oom();
 873
 874         if (symlink("pts/ptmx", p) < 0) {
 875                 log_error("Failed to create /dev/ptmx symlink: %m");
 876                 return -errno;
 877         }
 878
 879         return 0;
 880 }
 881
 882 static int setup_dev_console(const char *dest, const char *console) {
 883         _cleanup_umask_ mode_t u;
 884         const char *to;
 885         struct stat st;
 886         int r;
 887
 888         assert(dest);
 889         assert(console);
 890
 891         u = umask(0000);
 892
 893         if (stat("/dev/null", &st) < 0) {
 894                 log_error("Failed to stat /dev/null: %m");
 895                 return -errno;
 896         }
 897
 898         r = chmod_and_chown(console, 0600, 0, 0);
 899         if (r < 0) {
 900                 log_error("Failed to correct access mode for TTY: %s", strerror(-r));
 901                 return r;
 902         }
 903
 904         /* We need to bind mount the right tty to /dev/console since
 905          * ptys can only exist on pts file systems. To have something
 906          * to bind mount things on we create a device node first, and
 907          * use /dev/null for that since we the cgroups device policy
 908          * allows us to create that freely, while we cannot create
 909          * /dev/console. (Note that the major minor doesn't actually
 910          * matter here, since we mount it over anyway). */
 911
 912         to = strappenda(dest, "/dev/console");
 913         if (mknod(to, (st.st_mode & ~07777) | 0600, st.st_rdev) < 0) {
 914                 log_error("mknod() for /dev/console failed: %m");
 915                 return -errno;
 916         }
 917
 918         if (mount(console, to, "bind", MS_BIND, NULL) < 0) {
 919                 log_error("Bind mount for /dev/console failed: %m");
 920                 return -errno;
 921         }
 922
 923         return 0;
 924 }
 925
 926 static int setup_kmsg(const char *dest, int kmsg_socket) {
 927         _cleanup_free_ char *from = NULL, *to = NULL;
 928         int r, fd, k;
 929         _cleanup_umask_ mode_t u;
 930         union {
 931                 struct cmsghdr cmsghdr;
 932                 uint8_t buf[CMSG_SPACE(sizeof(int))];
 933         } control = {};
 934         struct msghdr mh = {
 935                 .msg_control = &control,
 936                 .msg_controllen = sizeof(control),
 937         };
 938         struct cmsghdr *cmsg;
 939
 940         assert(dest);
 941         assert(kmsg_socket >= 0);
 942
 943         u = umask(0000);
 944
 945         /* We create the kmsg FIFO as /dev/kmsg, but immediately
 946          * delete it after bind mounting it to /proc/kmsg. While FIFOs
 947          * on the reading side behave very similar to /proc/kmsg,
 948          * their writing side behaves differently from /dev/kmsg in
 949          * that writing blocks when nothing is reading. In order to
 950          * avoid any problems with containers deadlocking due to this
 951          * we simply make /dev/kmsg unavailable to the container. */
 952         if (asprintf(&from, "%s/dev/kmsg", dest) < 0 ||
 953             asprintf(&to, "%s/proc/kmsg", dest) < 0)
 954                 return log_oom();
 955
 956         if (mkfifo(from, 0600) < 0) {
 957                 log_error("mkfifo() for /dev/kmsg failed: %m");
 958                 return -errno;
 959         }
 960
 961         r = chmod_and_chown(from, 0600, 0, 0);
 962         if (r < 0) {
 963                 log_error("Failed to correct access mode for /dev/kmsg: %s", strerror(-r));
 964                 return r;
 965         }
 966
 967         if (mount(from, to, "bind", MS_BIND, NULL) < 0) {
 968                 log_error("Bind mount for /proc/kmsg failed: %m");
 969                 return -errno;
 970         }
 971
 972         fd = open(from, O_RDWR|O_NDELAY|O_CLOEXEC);
 973         if (fd < 0) {
 974                 log_error("Failed to open fifo: %m");
 975                 return -errno;
 976         }
 977
 978         cmsg = CMSG_FIRSTHDR(&mh);
 979         cmsg->cmsg_level = SOL_SOCKET;
 980         cmsg->cmsg_type = SCM_RIGHTS;
 981         cmsg->cmsg_len = CMSG_LEN(sizeof(int));
 982         memcpy(CMSG_DATA(cmsg), &fd, sizeof(int));
 983
 984         mh.msg_controllen = cmsg->cmsg_len;
 985
 986         /* Store away the fd in the socket, so that it stays open as
 987          * long as we run the child */
 988         k = sendmsg(kmsg_socket, &mh, MSG_DONTWAIT|MSG_NOSIGNAL);
 989         safe_close(fd);
 990
 991         if (k < 0) {
 992                 log_error("Failed to send FIFO fd: %m");
 993                 return -errno;
 994         }
 995
 996         /* And now make the FIFO unavailable as /dev/kmsg... */
 997         unlink(from);
 998         return 0;
 999 }
1000
1001 static int setup_hostname(void) {
1002
1003         if (arg_share_system)
1004                 return 0;
1005
1006         if (sethostname(arg_machine, strlen(arg_machine)) < 0)
1007                 return -errno;
1008
1009         return 0;
1010 }
1011
1012 static int setup_journal(const char *directory) {
1013         sd_id128_t machine_id, this_id;
1014         _cleanup_free_ char *p = NULL, *b = NULL, *q = NULL, *d = NULL;
1015         char *id;
1016         int r;
1017
1018         p = strappend(directory, "/etc/machine-id");
1019         if (!p)
1020                 return log_oom();
1021
1022         r = read_one_line_file(p, &b);
1023         if (r == -ENOENT && arg_link_journal == LINK_AUTO)
1024                 return 0;
1025         else if (r < 0) {
1026                 log_error("Failed to read machine ID from %s: %s", p, strerror(-r));
1027                 return r;
1028         }
1029
1030         id = strstrip(b);
1031         if (isempty(id) && arg_link_journal == LINK_AUTO)
1032                 return 0;
1033
1034         /* Verify validity */
1035         r = sd_id128_from_string(id, &machine_id);
1036         if (r < 0) {
1037                 log_error("Failed to parse machine ID from %s: %s", p, strerror(-r));
1038                 return r;
1039         }
1040
1041         r = sd_id128_get_machine(&this_id);
1042         if (r < 0) {
1043                 log_error("Failed to retrieve machine ID: %s", strerror(-r));
1044                 return r;
1045         }
1046
1047         if (sd_id128_equal(machine_id, this_id)) {
1048                 log_full(arg_link_journal == LINK_AUTO ? LOG_WARNING : LOG_ERR,
1049                          "Host and machine ids are equal (%s): refusing to link journals", id);
1050                 if (arg_link_journal == LINK_AUTO)
1051                         return 0;
1052                 return
1053                         -EEXIST;
1054         }
1055
1056         if (arg_link_journal == LINK_NO)
1057                 return 0;
1058
1059         free(p);
1060         p = strappend("/var/log/journal/", id);
1061         q = strjoin(directory, "/var/log/journal/", id, NULL);
1062         if (!p || !q)
1063                 return log_oom();
1064
1065         if (path_is_mount_point(p, false) > 0) {
1066                 if (arg_link_journal != LINK_AUTO) {
1067                         log_error("%s: already a mount point, refusing to use for journal", p);
1068                         return -EEXIST;
1069                 }
1070
1071                 return 0;
1072         }
1073
1074         if (path_is_mount_point(q, false) > 0) {
1075                 if (arg_link_journal != LINK_AUTO) {
1076                         log_error("%s: already a mount point, refusing to use for journal", q);
1077                         return -EEXIST;
1078                 }
1079
1080                 return 0;
1081         }
1082
1083         r = readlink_and_make_absolute(p, &d);
1084         if (r >= 0) {
1085                 if ((arg_link_journal == LINK_GUEST ||
1086                      arg_link_journal == LINK_AUTO) &&
1087                     path_equal(d, q)) {
1088
1089                         r = mkdir_p(q, 0755);
1090                         if (r < 0)
1091                                 log_warning("failed to create directory %s: %m", q);
1092                         return 0;
1093                 }
1094
1095                 if (unlink(p) < 0) {
1096                         log_error("Failed to remove symlink %s: %m", p);
1097                         return -errno;
1098                 }
1099         } else if (r == -EINVAL) {
1100
1101                 if (arg_link_journal == LINK_GUEST &&
1102                     rmdir(p) < 0) {
1103
1104                         if (errno == ENOTDIR) {
1105                                 log_error("%s already exists and is neither a symlink nor a directory", p);
1106                                 return r;
1107                         } else {
1108                                 log_error("Failed to remove %s: %m", p);
1109                                 return -errno;
1110                         }
1111                 }
1112         } else if (r != -ENOENT) {
1113                 log_error("readlink(%s) failed: %m", p);
1114                 return r;
1115         }
1116
1117         if (arg_link_journal == LINK_GUEST) {
1118
1119                 if (symlink(q, p) < 0) {
1120                         log_error("Failed to symlink %s to %s: %m", q, p);
1121                         return -errno;
1122                 }
1123
1124                 r = mkdir_p(q, 0755);
1125                 if (r < 0)
1126                         log_warning("failed to create directory %s: %m", q);
1127                 return 0;
1128         }
1129
1130         if (arg_link_journal == LINK_HOST) {
1131                 r = mkdir_p(p, 0755);
1132                 if (r < 0) {
1133                         log_error("Failed to create %s: %m", p);
1134                         return r;
1135                 }
1136
1137         } else if (access(p, F_OK) < 0)
1138                 return 0;
1139
1140         if (dir_is_empty(q) == 0) {
1141                 log_error("%s not empty.", q);
1142                 return -ENOTEMPTY;
1143         }
1144
1145         r = mkdir_p(q, 0755);
1146         if (r < 0) {
1147                 log_error("Failed to create %s: %m", q);
1148                 return r;
1149         }
1150
1151         if (mount(p, q, "bind", MS_BIND, NULL) < 0) {
1152                 log_error("Failed to bind mount journal from host into guest: %m");
1153                 return -errno;
1154         }
1155
1156         return 0;
1157 }
1158
1159 static int setup_kdbus(const char *dest, const char *path) {
1160         const char *p;
1161
1162         if (!path)
1163                 return 0;
1164
1165         p = strappenda(dest, "/dev/kdbus");
1166         if (mkdir(p, 0755) < 0) {
1167                 log_error("Failed to create kdbus path: %m");
1168                 return  -errno;
1169         }
1170
1171         if (mount(path, p, "bind", MS_BIND, NULL) < 0) {
1172                 log_error("Failed to mount kdbus domain path: %m");
1173                 return -errno;
1174         }
1175
1176         return 0;
1177 }
1178
1179 static int drop_capabilities(void) {
1180         return capability_bounding_set_drop(~arg_retain, false);
1181 }
1182
1183 static int register_machine(pid_t pid) {
1184         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
1185         _cleanup_bus_unref_ sd_bus *bus = NULL;
1186         int r;
1187
1188         if (!arg_register)
1189                 return 0;
1190
1191         r = sd_bus_default_system(&bus);
1192         if (r < 0) {
1193                 log_error("Failed to open system bus: %s", strerror(-r));
1194                 return r;
1195         }
1196
1197         if (arg_keep_unit) {
1198                 r = sd_bus_call_method(
1199                                 bus,
1200                                 "org.freedesktop.machine1",
1201                                 "/org/freedesktop/machine1",
1202                                 "org.freedesktop.machine1.Manager",
1203                                 "RegisterMachine",
1204                                 &error,
1205                                 NULL,
1206                                 "sayssus",
1207                                 arg_machine,
1208                                 SD_BUS_MESSAGE_APPEND_ID128(arg_uuid),
1209                                 "nspawn",
1210                                 "container",
1211                                 (uint32_t) pid,
1212                                 strempty(arg_directory));
1213         } else {
1214                 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
1215
1216                 r = sd_bus_message_new_method_call(
1217                                 bus,
1218                                 &m,
1219                                 "org.freedesktop.machine1",
1220                                 "/org/freedesktop/machine1",
1221                                 "org.freedesktop.machine1.Manager",
1222                                 "CreateMachine");
1223                 if (r < 0) {
1224                         log_error("Failed to create message: %s", strerror(-r));
1225                         return r;
1226                 }
1227
1228                 r = sd_bus_message_append(
1229                                 m,
1230                                 "sayssus",
1231                                 arg_machine,
1232                                 SD_BUS_MESSAGE_APPEND_ID128(arg_uuid),
1233                                 "nspawn",
1234                                 "container",
1235                                 (uint32_t) pid,
1236                                 strempty(arg_directory));
1237                 if (r < 0) {
1238                         log_error("Failed to append message arguments: %s", strerror(-r));
1239                         return r;
1240                 }
1241
1242                 r = sd_bus_message_open_container(m, 'a', "(sv)");
1243                 if (r < 0) {
1244                         log_error("Failed to open container: %s", strerror(-r));
1245                         return r;
1246                 }
1247
1248                 if (!isempty(arg_slice)) {
1249                         r = sd_bus_message_append(m, "(sv)", "Slice", "s", arg_slice);
1250                         if (r < 0) {
1251                                 log_error("Failed to append slice: %s", strerror(-r));
1252                                 return r;
1253                         }
1254                 }
1255
1256                 r = sd_bus_message_append(m, "(sv)", "DevicePolicy", "s", "strict");
1257                 if (r < 0) {
1258                         log_error("Failed to add device policy: %s", strerror(-r));
1259                         return r;
1260                 }
1261
1262                 r = sd_bus_message_append(m, "(sv)", "DeviceAllow", "a(ss)", 10,
1263                                           /* Allow the container to
1264                                            * access and create the API
1265                                            * device nodes, so that
1266                                            * PrivateDevices= in the
1267                                            * container can work
1268                                            * fine */
1269                                           "/dev/null", "rwm",
1270                                           "/dev/zero", "rwm",
1271                                           "/dev/full", "rwm",
1272                                           "/dev/random", "rwm",
1273                                           "/dev/urandom", "rwm",
1274                                           "/dev/tty", "rwm",
1275                                           /* Allow the container
1276                                            * access to ptys. However,
1277                                            * do not permit the
1278                                            * container to ever create
1279                                            * these device nodes. */
1280                                           "/dev/pts/ptmx", "rw",
1281                                           "char-pts", "rw",
1282                                           /* Allow the container
1283                                            * access to all kdbus
1284                                            * devices. Again, the
1285                                            * container cannot create
1286                                            * these nodes, only use
1287                                            * them. We use a pretty
1288                                            * open match here, so that
1289                                            * the kernel API can still
1290                                            * change. */
1291                                           "char-kdbus", "rw",
1292                                           "char-kdbus/*", "rw");
1293                 if (r < 0) {
1294                         log_error("Failed to add device whitelist: %s", strerror(-r));
1295                         return r;
1296                 }
1297
1298                 r = sd_bus_message_close_container(m);
1299                 if (r < 0) {
1300                         log_error("Failed to close container: %s", strerror(-r));
1301                         return r;
1302                 }
1303
1304                 r = sd_bus_call(bus, m, 0, &error, NULL);
1305         }
1306
1307         if (r < 0) {
1308                 log_error("Failed to register machine: %s", bus_error_message(&error, r));
1309                 return r;
1310         }
1311
1312         return 0;
1313 }
1314
1315 static int terminate_machine(pid_t pid) {
1316         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
1317         _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
1318         _cleanup_bus_unref_ sd_bus *bus = NULL;
1319         const char *path;
1320         int r;
1321
1322         if (!arg_register)
1323                 return 0;
1324
1325         r = sd_bus_default_system(&bus);
1326         if (r < 0) {
1327                 log_error("Failed to open system bus: %s", strerror(-r));
1328                 return r;
1329         }
1330
1331         r = sd_bus_call_method(
1332                         bus,
1333                         "org.freedesktop.machine1",
1334                         "/org/freedesktop/machine1",
1335                         "org.freedesktop.machine1.Manager",
1336                         "GetMachineByPID",
1337                         &error,
1338                         &reply,
1339                         "u",
1340                         (uint32_t) pid);
1341         if (r < 0) {
1342                 /* Note that the machine might already have been
1343                  * cleaned up automatically, hence don't consider it a
1344                  * failure if we cannot get the machine object. */
1345                 log_debug("Failed to get machine: %s", bus_error_message(&error, r));
1346                 return 0;
1347         }
1348
1349         r = sd_bus_message_read(reply, "o", &path);
1350         if (r < 0)
1351                 return bus_log_parse_error(r);
1352
1353         r = sd_bus_call_method(
1354                         bus,
1355                         "org.freedesktop.machine1",
1356                         path,
1357                         "org.freedesktop.machine1.Machine",
1358                         "Terminate",
1359                         &error,
1360                         NULL,
1361                         NULL);
1362         if (r < 0) {
1363                 log_debug("Failed to terminate machine: %s", bus_error_message(&error, r));
1364                 return 0;
1365         }
1366
1367         return 0;
1368 }
1369
1370 static int reset_audit_loginuid(void) {
1371         _cleanup_free_ char *p = NULL;
1372         int r;
1373
1374         if (arg_share_system)
1375                 return 0;
1376
1377         r = read_one_line_file("/proc/self/loginuid", &p);
1378         if (r == -ENOENT)
1379                 return 0;
1380         if (r < 0) {
1381                 log_error("Failed to read /proc/self/loginuid: %s", strerror(-r));
1382                 return r;
1383         }
1384
1385         /* Already reset? */
1386         if (streq(p, "4294967295"))
1387                 return 0;
1388
1389         r = write_string_file("/proc/self/loginuid", "4294967295");
1390         if (r < 0) {
1391                 log_error("Failed to reset audit login UID. This probably means that your kernel is too\n"
1392                           "old and you have audit enabled. Note that the auditing subsystem is known to\n"
1393                           "be incompatible with containers on old kernels. Please make sure to upgrade\n"
1394                           "your kernel or to off auditing with 'audit=0' on the kernel command line before\n"
1395                           "using systemd-nspawn. Sleeping for 5s... (%s)\n", strerror(-r));
1396
1397                 sleep(5);
1398         }
1399
1400         return 0;
1401 }
1402
1403 #define HASH_KEY SD_ID128_MAKE(c3,c4,f9,19,b5,57,b2,1c,e6,cf,14,27,03,9c,ee,a2)
1404
1405 static int get_mac(struct ether_addr *mac) {
1406         int r;
1407
1408         uint8_t result[8];
1409         size_t l, sz;
1410         uint8_t *v;
1411
1412         l = strlen(arg_machine);
1413         sz = sizeof(sd_id128_t) + l;
1414         v = alloca(sz);
1415
1416         /* fetch some persistent data unique to the host */
1417         r = sd_id128_get_machine((sd_id128_t*) v);
1418         if (r < 0)
1419                 return r;
1420
1421         /* combine with some data unique (on this host) to this
1422          * container instance */
1423         memcpy(v + sizeof(sd_id128_t), arg_machine, l);
1424
1425         /* Let's hash the host machine ID plus the container name. We
1426          * use a fixed, but originally randomly created hash key here. */
1427         siphash24(result, v, sz, HASH_KEY.bytes);
1428
1429         assert_cc(ETH_ALEN <= sizeof(result));
1430         memcpy(mac->ether_addr_octet, result, ETH_ALEN);
1431
1432         /* see eth_random_addr in the kernel */
1433         mac->ether_addr_octet[0] &= 0xfe;        /* clear multicast bit */
1434         mac->ether_addr_octet[0] |= 0x02;        /* set local assignment bit (IEEE802) */
1435
1436         return 0;
1437 }
1438
1439 static int setup_veth(pid_t pid, char iface_name[IFNAMSIZ]) {
1440         _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
1441         _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
1442         struct ether_addr mac;
1443         int r;
1444
1445         if (!arg_private_network)
1446                 return 0;
1447
1448         if (!arg_network_veth)
1449                 return 0;
1450
1451         /* Use two different interface name prefixes depending whether
1452          * we are in bridge mode or not. */
1453         if (arg_network_bridge)
1454                 memcpy(iface_name, "vb-", 3);
1455         else
1456                 memcpy(iface_name, "ve-", 3);
1457         strncpy(iface_name+3, arg_machine, IFNAMSIZ - 3);
1458
1459         r = get_mac(&mac);
1460         if (r < 0) {
1461                 log_error("Failed to generate predictable MAC address for host0");
1462                 return r;
1463         }
1464
1465         r = sd_rtnl_open(&rtnl, 0);
1466         if (r < 0) {
1467                 log_error("Failed to connect to netlink: %s", strerror(-r));
1468                 return r;
1469         }
1470
1471         r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
1472         if (r < 0) {
1473                 log_error("Failed to allocate netlink message: %s", strerror(-r));
1474                 return r;
1475         }
1476
1477         r = sd_rtnl_message_append_string(m, IFLA_IFNAME, iface_name);
1478         if (r < 0) {
1479                 log_error("Failed to add netlink interface name: %s", strerror(-r));
1480                 return r;
1481         }
1482
1483         r = sd_rtnl_message_open_container(m, IFLA_LINKINFO);
1484         if (r < 0) {
1485                 log_error("Failed to open netlink container: %s", strerror(-r));
1486                 return r;
1487         }
1488
1489         r = sd_rtnl_message_open_container_union(m, IFLA_INFO_DATA, "veth");
1490         if (r < 0) {
1491                 log_error("Failed to open netlink container: %s", strerror(-r));
1492                 return r;
1493         }
1494
1495         r = sd_rtnl_message_open_container(m, VETH_INFO_PEER);
1496         if (r < 0) {
1497                 log_error("Failed to open netlink container: %s", strerror(-r));
1498                 return r;
1499         }
1500
1501         r = sd_rtnl_message_append_string(m, IFLA_IFNAME, "host0");
1502         if (r < 0) {
1503                 log_error("Failed to add netlink interface name: %s", strerror(-r));
1504                 return r;
1505         }
1506
1507         r = sd_rtnl_message_append_ether_addr(m, IFLA_ADDRESS, &mac);
1508         if (r < 0) {
1509                 log_error("Failed to add netlink MAC address: %s", strerror(-r));
1510                 return r;
1511         }
1512
1513         r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid);
1514         if (r < 0) {
1515                 log_error("Failed to add netlink namespace field: %s", strerror(-r));
1516                 return r;
1517         }
1518
1519         r = sd_rtnl_message_close_container(m);
1520         if (r < 0) {
1521                 log_error("Failed to close netlink container: %s", strerror(-r));
1522                 return r;
1523         }
1524
1525         r = sd_rtnl_message_close_container(m);
1526         if (r < 0) {
1527                 log_error("Failed to close netlink container: %s", strerror(-r));
1528                 return r;
1529         }
1530
1531         r = sd_rtnl_message_close_container(m);
1532         if (r < 0) {
1533                 log_error("Failed to close netlink container: %s", strerror(-r));
1534                 return r;
1535         }
1536
1537         r = sd_rtnl_call(rtnl, m, 0, NULL);
1538         if (r < 0) {
1539                 log_error("Failed to add new veth interfaces: %s", strerror(-r));
1540                 return r;
1541         }
1542
1543         return 0;
1544 }
1545
1546 static int setup_bridge(const char veth_name[]) {
1547         _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
1548         _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
1549         int r, bridge;
1550
1551         if (!arg_private_network)
1552                 return 0;
1553
1554         if (!arg_network_veth)
1555                 return 0;
1556
1557         if (!arg_network_bridge)
1558                 return 0;
1559
1560         bridge = (int) if_nametoindex(arg_network_bridge);
1561         if (bridge <= 0) {
1562                 log_error("Failed to resolve interface %s: %m", arg_network_bridge);
1563                 return -errno;
1564         }
1565
1566         r = sd_rtnl_open(&rtnl, 0);
1567         if (r < 0) {
1568                 log_error("Failed to connect to netlink: %s", strerror(-r));
1569                 return r;
1570         }
1571
1572         r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, 0);
1573         if (r < 0) {
1574                 log_error("Failed to allocate netlink message: %s", strerror(-r));
1575                 return r;
1576         }
1577
1578         r = sd_rtnl_message_link_set_flags(m, IFF_UP, IFF_UP);
1579         if (r < 0) {
1580                 log_error("Failed to set IFF_UP flag: %s", strerror(-r));
1581                 return r;
1582         }
1583
1584         r = sd_rtnl_message_append_string(m, IFLA_IFNAME, veth_name);
1585         if (r < 0) {
1586                 log_error("Failed to add netlink interface name field: %s", strerror(-r));
1587                 return r;
1588         }
1589
1590         r = sd_rtnl_message_append_u32(m, IFLA_MASTER, bridge);
1591         if (r < 0) {
1592                 log_error("Failed to add netlink master field: %s", strerror(-r));
1593                 return r;
1594         }
1595
1596         r = sd_rtnl_call(rtnl, m, 0, NULL);
1597         if (r < 0) {
1598                 log_error("Failed to add veth interface to bridge: %s", strerror(-r));
1599                 return r;
1600         }
1601
1602         return 0;
1603 }
1604
1605 static int parse_interface(struct udev *udev, const char *name) {
1606         _cleanup_udev_device_unref_ struct udev_device *d = NULL;
1607         char ifi_str[2 + DECIMAL_STR_MAX(int)];
1608         int ifi;
1609
1610         ifi = (int) if_nametoindex(name);
1611         if (ifi <= 0) {
1612                 log_error("Failed to resolve interface %s: %m", name);
1613                 return -errno;
1614         }
1615
1616         sprintf(ifi_str, "n%i", ifi);
1617         d = udev_device_new_from_device_id(udev, ifi_str);
1618         if (!d) {
1619                 log_error("Failed to get udev device for interface %s: %m", name);
1620                 return -errno;
1621         }
1622
1623         if (udev_device_get_is_initialized(d) <= 0) {
1624                 log_error("Network interface %s is not initialized yet.", name);
1625                 return -EBUSY;
1626         }
1627
1628         return ifi;
1629 }
1630
1631 static int move_network_interfaces(pid_t pid) {
1632         _cleanup_udev_unref_ struct udev *udev = NULL;
1633         _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
1634         char **i;
1635         int r;
1636
1637         if (!arg_private_network)
1638                 return 0;
1639
1640         if (strv_isempty(arg_network_interfaces))
1641                 return 0;
1642
1643         r = sd_rtnl_open(&rtnl, 0);
1644         if (r < 0) {
1645                 log_error("Failed to connect to netlink: %s", strerror(-r));
1646                 return r;
1647         }
1648
1649         udev = udev_new();
1650         if (!udev) {
1651                 log_error("Failed to connect to udev.");
1652                 return -ENOMEM;
1653         }
1654
1655         STRV_FOREACH(i, arg_network_interfaces) {
1656                 _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
1657                 int ifi;
1658
1659                 ifi = parse_interface(udev, *i);
1660                 if (ifi < 0)
1661                         return ifi;
1662
1663                 r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, ifi);
1664                 if (r < 0) {
1665                         log_error("Failed to allocate netlink message: %s", strerror(-r));
1666                         return r;
1667                 }
1668
1669                 r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid);
1670                 if (r < 0) {
1671                         log_error("Failed to append namespace PID to netlink message: %s", strerror(-r));
1672                         return r;
1673                 }
1674
1675                 r = sd_rtnl_call(rtnl, m, 0, NULL);
1676                 if (r < 0) {
1677                         log_error("Failed to move interface %s to namespace: %s", *i, strerror(-r));
1678                         return r;
1679                 }
1680         }
1681
1682         return 0;
1683 }
1684
1685 static int setup_macvlan(pid_t pid) {
1686         _cleanup_udev_unref_ struct udev *udev = NULL;
1687         _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
1688         char **i;
1689         int r;
1690
1691         if (!arg_private_network)
1692                 return 0;
1693
1694         if (strv_isempty(arg_network_macvlan))
1695                 return 0;
1696
1697         r = sd_rtnl_open(&rtnl, 0);
1698         if (r < 0) {
1699                 log_error("Failed to connect to netlink: %s", strerror(-r));
1700                 return r;
1701         }
1702
1703         udev = udev_new();
1704         if (!udev) {
1705                 log_error("Failed to connect to udev.");
1706                 return -ENOMEM;
1707         }
1708
1709         STRV_FOREACH(i, arg_network_macvlan) {
1710                 _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
1711                 _cleanup_free_ char *n = NULL;
1712                 int ifi;
1713
1714                 ifi = parse_interface(udev, *i);
1715                 if (ifi < 0)
1716                         return ifi;
1717
1718                 r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
1719                 if (r < 0) {
1720                         log_error("Failed to allocate netlink message: %s", strerror(-r));
1721                         return r;
1722                 }
1723
1724                 r = sd_rtnl_message_append_u32(m, IFLA_LINK, ifi);
1725                 if (r < 0) {
1726                         log_error("Failed to add netlink interface index: %s", strerror(-r));
1727                         return r;
1728                 }
1729
1730                 n = strappend("mv-", *i);
1731                 if (!n)
1732                         return log_oom();
1733
1734                 strshorten(n, IFNAMSIZ-1);
1735
1736                 r = sd_rtnl_message_append_string(m, IFLA_IFNAME, n);
1737                 if (r < 0) {
1738                         log_error("Failed to add netlink interface name: %s", strerror(-r));
1739                         return r;
1740                 }
1741
1742                 r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid);
1743                 if (r < 0) {
1744                         log_error("Failed to add netlink namespace field: %s", strerror(-r));
1745                         return r;
1746                 }
1747
1748                 r = sd_rtnl_message_open_container(m, IFLA_LINKINFO);
1749                 if (r < 0) {
1750                         log_error("Failed to open netlink container: %s", strerror(-r));
1751                         return r;
1752                 }
1753
1754                 r = sd_rtnl_message_open_container_union(m, IFLA_INFO_DATA, "macvlan");
1755                 if (r < 0) {
1756                         log_error("Failed to open netlink container: %s", strerror(-r));
1757                         return r;
1758                 }
1759
1760                 r = sd_rtnl_message_append_u32(m, IFLA_MACVLAN_MODE, MACVLAN_MODE_BRIDGE);
1761                 if (r < 0) {
1762                         log_error("Failed to append macvlan mode: %s", strerror(-r));
1763                         return r;
1764                 }
1765
1766                 r = sd_rtnl_message_close_container(m);
1767                 if (r < 0) {
1768                         log_error("Failed to close netlink container: %s", strerror(-r));
1769                         return r;
1770                 }
1771
1772                 r = sd_rtnl_message_close_container(m);
1773                 if (r < 0) {
1774                         log_error("Failed to close netlink container: %s", strerror(-r));
1775                         return r;
1776                 }
1777
1778                 r = sd_rtnl_call(rtnl, m, 0, NULL);
1779                 if (r < 0) {
1780                         log_error("Failed to add new macvlan interfaces: %s", strerror(-r));
1781                         return r;
1782                 }
1783         }
1784
1785         return 0;
1786 }
1787
1788 static int audit_still_doesnt_work_in_containers(void) {
1789
1790 #ifdef HAVE_SECCOMP
1791         scmp_filter_ctx seccomp;
1792         int r;
1793
1794         /*
1795            Audit is broken in containers, much of the userspace audit
1796            hookup will fail if running inside a container. We don't
1797            care and just turn off creation of audit sockets.
1798
1799            This will make socket(AF_NETLINK, *, NETLINK_AUDIT) fail
1800            with EAFNOSUPPORT which audit userspace uses as indication
1801            that audit is disabled in the kernel.
1802          */
1803
1804         seccomp = seccomp_init(SCMP_ACT_ALLOW);
1805         if (!seccomp)
1806                 return log_oom();
1807
1808         r = seccomp_add_secondary_archs(seccomp);
1809         if (r < 0) {
1810                 log_error("Failed to add secondary archs to seccomp filter: %s", strerror(-r));
1811                 goto finish;
1812         }
1813
1814         r = seccomp_rule_add(
1815                         seccomp,
1816                         SCMP_ACT_ERRNO(EAFNOSUPPORT),
1817                         SCMP_SYS(socket),
1818                         2,
1819                         SCMP_A0(SCMP_CMP_EQ, AF_NETLINK),
1820                         SCMP_A2(SCMP_CMP_EQ, NETLINK_AUDIT));
1821         if (r < 0) {
1822                 log_error("Failed to add audit seccomp rule: %s", strerror(-r));
1823                 goto finish;
1824         }
1825
1826         r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
1827         if (r < 0) {
1828                 log_error("Failed to unset NO_NEW_PRIVS: %s", strerror(-r));
1829                 goto finish;
1830         }
1831
1832         r = seccomp_load(seccomp);
1833         if (r < 0)
1834                 log_error("Failed to install seccomp audit filter: %s", strerror(-r));
1835
1836 finish:
1837         seccomp_release(seccomp);
1838         return r;
1839 #else
1840         return 0;
1841 #endif
1842
1843 }
1844
1845 static int setup_image(char **device_path, int *loop_nr) {
1846         struct loop_info64 info = {
1847                 .lo_flags = LO_FLAGS_AUTOCLEAR|LO_FLAGS_PARTSCAN
1848         };
1849         _cleanup_close_ int fd = -1, control = -1, loop = -1;
1850         _cleanup_free_ char* loopdev = NULL;
1851         struct stat st;
1852         int r, nr;
1853
1854         assert(device_path);
1855         assert(loop_nr);
1856
1857         fd = open(arg_image, O_CLOEXEC|(arg_read_only ? O_RDONLY : O_RDWR)|O_NONBLOCK|O_NOCTTY);
1858         if (fd < 0) {
1859                 log_error("Failed to open %s: %m", arg_image);
1860                 return -errno;
1861         }
1862
1863         if (fstat(fd, &st) < 0) {
1864                 log_error("Failed to stat %s: %m", arg_image);
1865                 return -errno;
1866         }
1867
1868         if (S_ISBLK(st.st_mode)) {
1869                 char *p;
1870
1871                 p = strdup(arg_image);
1872                 if (!p)
1873                         return log_oom();
1874
1875                 *device_path = p;
1876
1877                 *loop_nr = -1;
1878
1879                 r = fd;
1880                 fd = -1;
1881
1882                 return r;
1883         }
1884
1885         if (!S_ISREG(st.st_mode)) {
1886                 log_error("%s is not a regular file or block device: %m", arg_image);
1887                 return -EINVAL;
1888         }
1889
1890         control = open("/dev/loop-control", O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
1891         if (control < 0) {
1892                 log_error("Failed to open /dev/loop-control: %m");
1893                 return -errno;
1894         }
1895
1896         nr = ioctl(control, LOOP_CTL_GET_FREE);
1897         if (nr < 0) {
1898                 log_error("Failed to allocate loop device: %m");
1899                 return -errno;
1900         }
1901
1902         if (asprintf(&loopdev, "/dev/loop%i", nr) < 0)
1903                 return log_oom();
1904
1905         loop = open(loopdev, O_CLOEXEC|(arg_read_only ? O_RDONLY : O_RDWR)|O_NONBLOCK|O_NOCTTY);
1906         if (loop < 0) {
1907                 log_error("Failed to open loop device %s: %m", loopdev);
1908                 return -errno;
1909         }
1910
1911         if (ioctl(loop, LOOP_SET_FD, fd) < 0) {
1912                 log_error("Failed to set loopback file descriptor on %s: %m", loopdev);
1913                 return -errno;
1914         }
1915
1916         if (arg_read_only)
1917                 info.lo_flags |= LO_FLAGS_READ_ONLY;
1918
1919         if (ioctl(loop, LOOP_SET_STATUS64, &info) < 0) {
1920                 log_error("Failed to set loopback settings on %s: %m", loopdev);
1921                 return -errno;
1922         }
1923
1924         *device_path = loopdev;
1925         loopdev = NULL;
1926
1927         *loop_nr = nr;
1928
1929         r = loop;
1930         loop = -1;
1931
1932         return r;
1933 }
1934
1935 static int dissect_image(
1936                 int fd,
1937                 char **root_device, bool *root_device_rw,
1938                 char **home_device, bool *home_device_rw,
1939                 char **srv_device, bool *srv_device_rw,
1940                 bool *secondary) {
1941
1942 #ifdef HAVE_BLKID
1943         int home_nr = -1, root_nr = -1, secondary_root_nr = -1, srv_nr = -1;
1944         _cleanup_free_ char *home = NULL, *root = NULL, *secondary_root = NULL, *srv = NULL;
1945         _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
1946         _cleanup_udev_device_unref_ struct udev_device *d = NULL;
1947         _cleanup_blkid_free_probe_ blkid_probe b = NULL;
1948         _cleanup_udev_unref_ struct udev *udev = NULL;
1949         struct udev_list_entry *first, *item;
1950         bool home_rw = true, root_rw = true, secondary_root_rw = true, srv_rw = true;
1951         const char *pttype = NULL;
1952         blkid_partlist pl;
1953         struct stat st;
1954         int r;
1955
1956         assert(fd >= 0);
1957         assert(root_device);
1958         assert(home_device);
1959         assert(srv_device);
1960         assert(secondary);
1961
1962         b = blkid_new_probe();
1963         if (!b)
1964                 return log_oom();
1965
1966         errno = 0;
1967         r = blkid_probe_set_device(b, fd, 0, 0);
1968         if (r != 0) {
1969                 if (errno == 0)
1970                         return log_oom();
1971
1972                 log_error("Failed to set device on blkid probe: %m");
1973                 return -errno;
1974         }
1975
1976         blkid_probe_enable_partitions(b, 1);
1977         blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS);
1978
1979         errno = 0;
1980         r = blkid_do_safeprobe(b);
1981         if (r == -2 || r == 1) {
1982                 log_error("Failed to identify any partition table on %s.\n"
1983                           "Note that the disk image needs to follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/ to be supported by systemd-nspawn.", arg_image);
1984                 return -EINVAL;
1985         } else if (r != 0) {
1986                 if (errno == 0)
1987                         errno = EIO;
1988                 log_error("Failed to probe: %m");
1989                 return -errno;
1990         }
1991
1992         blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL);
1993         if (!streq_ptr(pttype, "gpt")) {
1994                 log_error("Image %s does not carry a GUID Partition Table.\n"
1995                           "Note that the disk image needs to follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/ to be supported by systemd-nspawn.", arg_image);
1996                 return -EINVAL;
1997         }
1998
1999         errno = 0;
2000         pl = blkid_probe_get_partitions(b);
2001         if (!pl) {
2002                 if (errno == 0)
2003                         return log_oom();
2004
2005                 log_error("Failed to list partitions of %s", arg_image);
2006                 return -errno;
2007         }
2008
2009         udev = udev_new();
2010         if (!udev)
2011                 return log_oom();
2012
2013         if (fstat(fd, &st) < 0) {
2014                 log_error("Failed to stat block device: %m");
2015                 return -errno;
2016         }
2017
2018         d = udev_device_new_from_devnum(udev, 'b', st.st_rdev);
2019         if (!d)
2020                 return log_oom();
2021
2022         e = udev_enumerate_new(udev);
2023         if (!e)
2024                 return log_oom();
2025
2026         r = udev_enumerate_add_match_parent(e, d);
2027         if (r < 0)
2028                 return log_oom();
2029
2030         r = udev_enumerate_scan_devices(e);
2031         if (r < 0) {
2032                 log_error("Failed to scan for partition devices of %s: %s", arg_image, strerror(-r));
2033                 return r;
2034         }
2035
2036         first = udev_enumerate_get_list_entry(e);
2037         udev_list_entry_foreach(item, first) {
2038                 _cleanup_udev_device_unref_ struct udev_device *q;
2039                 const char *stype, *node;
2040                 unsigned long long flags;
2041                 sd_id128_t type_id;
2042                 blkid_partition pp;
2043                 dev_t qn;
2044                 int nr;
2045
2046                 errno = 0;
2047                 q = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
2048                 if (!q) {
2049                         if (!errno)
2050                                 errno = ENOMEM;
2051
2052                         log_error("Failed to get partition device of %s: %m", arg_image);
2053                         return -errno;
2054                 }
2055
2056                 qn = udev_device_get_devnum(q);
2057                 if (major(qn) == 0)
2058                         continue;
2059
2060                 if (st.st_rdev == qn)
2061                         continue;
2062
2063                 node = udev_device_get_devnode(q);
2064                 if (!node)
2065                         continue;
2066
2067                 pp = blkid_partlist_devno_to_partition(pl, qn);
2068                 if (!pp)
2069                         continue;
2070
2071                 flags = blkid_partition_get_flags(pp);
2072                 if (flags & GPT_FLAG_NO_AUTO)
2073                         continue;
2074
2075                 nr = blkid_partition_get_partno(pp);
2076                 if (nr < 0)
2077                         continue;
2078
2079                 stype = blkid_partition_get_type_string(pp);
2080                 if (!stype)
2081                         continue;
2082
2083                 if (sd_id128_from_string(stype, &type_id) < 0)
2084                         continue;
2085
2086                 if (sd_id128_equal(type_id, GPT_HOME)) {
2087
2088                         if (home && nr >= home_nr)
2089                                 continue;
2090
2091                         home_nr = nr;
2092                         home_rw = !(flags & GPT_FLAG_READ_ONLY);
2093
2094                         free(home);
2095                         home = strdup(node);
2096                         if (!home)
2097                                 return log_oom();
2098                 } else if (sd_id128_equal(type_id, GPT_SRV)) {
2099
2100                         if (srv && nr >= srv_nr)
2101                                 continue;
2102
2103                         srv_nr = nr;
2104                         srv_rw = !(flags & GPT_FLAG_READ_ONLY);
2105
2106                         free(srv);
2107                         srv = strdup(node);
2108                         if (!srv)
2109                                 return log_oom();
2110                 }
2111 #ifdef GPT_ROOT_NATIVE
2112                 else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE)) {
2113
2114                         if (root && nr >= root_nr)
2115                                 continue;
2116
2117                         root_nr = nr;
2118                         root_rw = !(flags & GPT_FLAG_READ_ONLY);
2119
2120                         free(root);
2121                         root = strdup(node);
2122                         if (!root)
2123                                 return log_oom();
2124                 }
2125 #endif
2126 #ifdef GPT_ROOT_SECONDARY
2127                 else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY)) {
2128
2129                         if (secondary_root && nr >= secondary_root_nr)
2130                                 continue;
2131
2132                         secondary_root_nr = nr;
2133                         secondary_root_rw = !(flags & GPT_FLAG_READ_ONLY);
2134
2135
2136                         free(secondary_root);
2137                         secondary_root = strdup(node);
2138                         if (!secondary_root)
2139                                 return log_oom();
2140                 }
2141 #endif
2142         }
2143
2144         if (!root && !secondary_root) {
2145                 log_error("Failed to identify root partition in disk image %s.\n"
2146                           "Note that the disk image needs to follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/ to be supported by systemd-nspawn.", arg_image);
2147                 return -EINVAL;
2148         }
2149
2150         if (root) {
2151                 *root_device = root;
2152                 root = NULL;
2153
2154                 *root_device_rw = root_rw;
2155                 *secondary = false;
2156         } else if (secondary_root) {
2157                 *root_device = secondary_root;
2158                 secondary_root = NULL;
2159
2160                 *root_device_rw = secondary_root_rw;
2161                 *secondary = true;
2162         }
2163
2164         if (home) {
2165                 *home_device = home;
2166                 home = NULL;
2167
2168                 *home_device_rw = home_rw;
2169         }
2170
2171         if (srv) {
2172                 *srv_device = srv;
2173                 srv = NULL;
2174
2175                 *srv_device_rw = srv_rw;
2176         }
2177
2178         return 0;
2179 #else
2180         log_error("--image= is not supported, compiled without blkid support.");
2181         return -ENOTSUP;
2182 #endif
2183 }
2184
2185 static int mount_device(const char *what, const char *where, const char *directory, bool rw) {
2186 #ifdef HAVE_BLKID
2187         _cleanup_blkid_free_probe_ blkid_probe b = NULL;
2188         const char *fstype, *p;
2189         int r;
2190
2191         assert(what);
2192         assert(where);
2193
2194         if (arg_read_only)
2195                 rw = false;
2196
2197         if (directory)
2198                 p = strappenda(where, directory);
2199         else
2200                 p = where;
2201
2202         errno = 0;
2203         b = blkid_new_probe_from_filename(what);
2204         if (!b) {
2205                 if (errno == 0)
2206                         return log_oom();
2207                 log_error("Failed to allocate prober for %s: %m", what);
2208                 return -errno;
2209         }
2210
2211         blkid_probe_enable_superblocks(b, 1);
2212         blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE);
2213
2214         errno = 0;
2215         r = blkid_do_safeprobe(b);
2216         if (r == -1 || r == 1) {
2217                 log_error("Cannot determine file system type of %s", what);
2218                 return -EINVAL;
2219         } else if (r != 0) {
2220                 if (errno == 0)
2221                         errno = EIO;
2222                 log_error("Failed to probe %s: %m", what);
2223                 return -errno;
2224         }
2225
2226         errno = 0;
2227         if (blkid_probe_lookup_value(b, "TYPE", &fstype, NULL) < 0) {
2228                 if (errno == 0)
2229                         errno = EINVAL;
2230                 log_error("Failed to determine file system type of %s", what);
2231                 return -errno;
2232         }
2233
2234         if (streq(fstype, "crypto_LUKS")) {
2235                 log_error("nspawn currently does not support LUKS disk images.");
2236                 return -ENOTSUP;
2237         }
2238
2239         if (mount(what, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), NULL) < 0) {
2240                 log_error("Failed to mount %s: %m", what);
2241                 return -errno;
2242         }
2243
2244         return 0;
2245 #else
2246         log_error("--image= is not supported, compiled without blkid support.");
2247         return -ENOTSUP;
2248 #endif
2249 }
2250
2251 static int mount_devices(
2252                 const char *where,
2253                 const char *root_device, bool root_device_rw,
2254                 const char *home_device, bool home_device_rw,
2255                 const char *srv_device, bool srv_device_rw) {
2256         int r;
2257
2258         assert(where);
2259
2260         if (root_device) {
2261                 r = mount_device(root_device, arg_directory, NULL, root_device_rw);
2262                 if (r < 0) {
2263                         log_error("Failed to mount root directory: %s", strerror(-r));
2264                         return r;
2265                 }
2266         }
2267
2268         if (home_device) {
2269                 r = mount_device(home_device, arg_directory, "/home", home_device_rw);
2270                 if (r < 0) {
2271                         log_error("Failed to mount home directory: %s", strerror(-r));
2272                         return r;
2273                 }
2274         }
2275
2276         if (srv_device) {
2277                 r = mount_device(srv_device, arg_directory, "/srv", srv_device_rw);
2278                 if (r < 0) {
2279                         log_error("Failed to mount server data directory: %s", strerror(-r));
2280                         return r;
2281                 }
2282         }
2283
2284         return 0;
2285 }
2286
2287 static void loop_remove(int nr, int *image_fd) {
2288         _cleanup_close_ int control = -1;
2289
2290         if (nr < 0)
2291                 return;
2292
2293         if (image_fd && *image_fd >= 0) {
2294                 ioctl(*image_fd, LOOP_CLR_FD);
2295                 *image_fd = safe_close(*image_fd);
2296         }
2297
2298         control = open("/dev/loop-control", O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
2299         if (control < 0)
2300                 return;
2301
2302         ioctl(control, LOOP_CTL_REMOVE, nr);
2303 }
2304
2305 static int spawn_getent(const char *database, const char *key, pid_t *rpid) {
2306         int pipe_fds[2];
2307         pid_t pid;
2308
2309         assert(database);
2310         assert(key);
2311         assert(rpid);
2312
2313         if (pipe2(pipe_fds, O_CLOEXEC) < 0) {
2314                 log_error("Failed to allocate pipe: %m");
2315                 return -errno;
2316         }
2317
2318         pid = fork();
2319         if (pid < 0) {
2320                 log_error("Failed to fork getent child: %m");
2321                 return -errno;
2322         } else if (pid == 0) {
2323                 int nullfd;
2324                 char *empty_env = NULL;
2325
2326                 if (dup3(pipe_fds[1], STDOUT_FILENO, 0) < 0)
2327                         _exit(EXIT_FAILURE);
2328
2329                 if (pipe_fds[0] > 2)
2330                         safe_close(pipe_fds[0]);
2331                 if (pipe_fds[1] > 2)
2332                         safe_close(pipe_fds[1]);
2333
2334                 nullfd = open("/dev/null", O_RDWR);
2335                 if (nullfd < 0)
2336                         _exit(EXIT_FAILURE);
2337
2338                 if (dup3(nullfd, STDIN_FILENO, 0) < 0)
2339                         _exit(EXIT_FAILURE);
2340
2341                 if (dup3(nullfd, STDERR_FILENO, 0) < 0)
2342                         _exit(EXIT_FAILURE);
2343
2344                 if (nullfd > 2)
2345                         safe_close(nullfd);
2346
2347                 reset_all_signal_handlers();
2348                 close_all_fds(NULL, 0);
2349
2350                 execle("/usr/bin/getent", "getent", database, key, NULL, &empty_env);
2351                 execle("/bin/getent", "getent", database, key, NULL, &empty_env);
2352                 _exit(EXIT_FAILURE);
2353         }
2354
2355         pipe_fds[1] = safe_close(pipe_fds[1]);
2356
2357         *rpid = pid;
2358
2359         return pipe_fds[0];
2360 }
2361
2362 static int change_uid_gid(char **_home) {
2363         char line[LINE_MAX], *w, *x, *state, *u, *g, *h;
2364         _cleanup_free_ uid_t *uids = NULL;
2365         _cleanup_free_ char *home = NULL;
2366         _cleanup_fclose_ FILE *f = NULL;
2367         _cleanup_close_ int fd = -1;
2368         unsigned n_uids = 0;
2369         size_t sz, l;
2370         uid_t uid;
2371         gid_t gid;
2372         pid_t pid;
2373         int r;
2374
2375         assert(_home);
2376
2377         if (!arg_user || streq(arg_user, "root") || streq(arg_user, "0")) {
2378                 /* Reset everything fully to 0, just in case */
2379
2380                 if (setgroups(0, NULL) < 0) {
2381                         log_error("setgroups() failed: %m");
2382                         return -errno;
2383                 }
2384
2385                 if (setresgid(0, 0, 0) < 0) {
2386                         log_error("setregid() failed: %m");
2387                         return -errno;
2388                 }
2389
2390                 if (setresuid(0, 0, 0) < 0) {
2391                         log_error("setreuid() failed: %m");
2392                         return -errno;
2393                 }
2394
2395                 *_home = NULL;
2396                 return 0;
2397         }
2398
2399         /* First, get user credentials */
2400         fd = spawn_getent("passwd", arg_user, &pid);
2401         if (fd < 0)
2402                 return fd;
2403
2404         f = fdopen(fd, "r");
2405         if (!f)
2406                 return log_oom();
2407         fd = -1;
2408
2409         if (!fgets(line, sizeof(line), f)) {
2410
2411                 if (!ferror(f)) {
2412                         log_error("Failed to resolve user %s.", arg_user);
2413                         return -ESRCH;
2414                 }
2415
2416                 log_error("Failed to read from getent: %m");
2417                 return -errno;
2418         }
2419
2420         truncate_nl(line);
2421
2422         wait_for_terminate_and_warn("getent passwd", pid);
2423
2424         x = strchr(line, ':');
2425         if (!x) {
2426                 log_error("/etc/passwd entry has invalid user field.");
2427                 return -EIO;
2428         }
2429
2430         u = strchr(x+1, ':');
2431         if (!u) {
2432                 log_error("/etc/passwd entry has invalid password field.");
2433                 return -EIO;
2434         }
2435
2436         u++;
2437         g = strchr(u, ':');
2438         if (!g) {
2439                 log_error("/etc/passwd entry has invalid UID field.");
2440                 return -EIO;
2441         }
2442
2443         *g = 0;
2444         g++;
2445         x = strchr(g, ':');
2446         if (!x) {
2447                 log_error("/etc/passwd entry has invalid GID field.");
2448                 return -EIO;
2449         }
2450
2451         *x = 0;
2452         h = strchr(x+1, ':');
2453         if (!h) {
2454                 log_error("/etc/passwd entry has invalid GECOS field.");
2455                 return -EIO;
2456         }
2457
2458         h++;
2459         x = strchr(h, ':');
2460         if (!x) {
2461                 log_error("/etc/passwd entry has invalid home directory field.");
2462                 return -EIO;
2463         }
2464
2465         *x = 0;
2466
2467         r = parse_uid(u, &uid);
2468         if (r < 0) {
2469                 log_error("Failed to parse UID of user.");
2470                 return -EIO;
2471         }
2472
2473         r = parse_gid(g, &gid);
2474         if (r < 0) {
2475                 log_error("Failed to parse GID of user.");
2476                 return -EIO;
2477         }
2478
2479         home = strdup(h);
2480         if (!home)
2481                 return log_oom();
2482
2483         /* Second, get group memberships */
2484         fd = spawn_getent("initgroups", arg_user, &pid);
2485         if (fd < 0)
2486                 return fd;
2487
2488         fclose(f);
2489         f = fdopen(fd, "r");
2490         if (!f)
2491                 return log_oom();
2492         fd = -1;
2493
2494         if (!fgets(line, sizeof(line), f)) {
2495                 if (!ferror(f)) {
2496                         log_error("Failed to resolve user %s.", arg_user);
2497                         return -ESRCH;
2498                 }
2499
2500                 log_error("Failed to read from getent: %m");
2501                 return -errno;
2502         }
2503
2504         truncate_nl(line);
2505
2506         wait_for_terminate_and_warn("getent initgroups", pid);
2507
2508         /* Skip over the username and subsequent separator whitespace */
2509         x = line;
2510         x += strcspn(x, WHITESPACE);
2511         x += strspn(x, WHITESPACE);
2512
2513         FOREACH_WORD(w, l, x, state) {
2514                 char c[l+1];
2515
2516                 memcpy(c, w, l);
2517                 c[l] = 0;
2518
2519                 if (!GREEDY_REALLOC(uids, sz, n_uids+1))
2520                         return log_oom();
2521
2522                 r = parse_uid(c, &uids[n_uids++]);
2523                 if (r < 0) {
2524                         log_error("Failed to parse group data from getent.");
2525                         return -EIO;
2526                 }
2527         }
2528
2529         r = mkdir_parents(home, 0775);
2530         if (r < 0) {
2531                 log_error("Failed to make home root directory: %s", strerror(-r));
2532                 return r;
2533         }
2534
2535         r = mkdir_safe(home, 0755, uid, gid);
2536         if (r < 0 && r != -EEXIST) {
2537                 log_error("Failed to make home directory: %s", strerror(-r));
2538                 return r;
2539         }
2540
2541         fchown(STDIN_FILENO, uid, gid);
2542         fchown(STDOUT_FILENO, uid, gid);
2543         fchown(STDERR_FILENO, uid, gid);
2544
2545         if (setgroups(n_uids, uids) < 0) {
2546                 log_error("Failed to set auxiliary groups: %m");
2547                 return -errno;
2548         }
2549
2550         if (setresgid(gid, gid, gid) < 0) {
2551                 log_error("setregid() failed: %m");
2552                 return -errno;
2553         }
2554
2555         if (setresuid(uid, uid, uid) < 0) {
2556                 log_error("setreuid() failed: %m");
2557                 return -errno;
2558         }
2559
2560         if (_home) {
2561                 *_home = home;
2562                 home = NULL;
2563         }
2564
2565         return 0;
2566 }
2567
2568 int main(int argc, char *argv[]) {
2569
2570         _cleanup_free_ char *kdbus_domain = NULL, *device_path = NULL, *root_device = NULL, *home_device = NULL, *srv_device = NULL;
2571         bool root_device_rw = true, home_device_rw = true, srv_device_rw = true;
2572         _cleanup_close_ int master = -1, kdbus_fd = -1, image_fd = -1;
2573         _cleanup_close_pair_ int kmsg_socket_pair[2] = { -1, -1 };
2574         _cleanup_fdset_free_ FDSet *fds = NULL;
2575         int r = EXIT_FAILURE, k, n_fd_passed, loop_nr = -1;
2576         const char *console = NULL;
2577         char veth_name[IFNAMSIZ];
2578         bool secondary = false;
2579         pid_t pid = 0;
2580         sigset_t mask;
2581
2582         log_parse_environment();
2583         log_open();
2584
2585         k = parse_argv(argc, argv);
2586         if (k < 0)
2587                 goto finish;
2588         else if (k == 0) {
2589                 r = EXIT_SUCCESS;
2590                 goto finish;
2591         }
2592
2593         if (!arg_image) {
2594                 if (arg_directory) {
2595                         char *p;
2596
2597                         p = path_make_absolute_cwd(arg_directory);
2598                         free(arg_directory);
2599                         arg_directory = p;
2600                 } else
2601                         arg_directory = get_current_dir_name();
2602
2603                 if (!arg_directory) {
2604                         log_error("Failed to determine path, please use -D.");
2605                         goto finish;
2606                 }
2607                 path_kill_slashes(arg_directory);
2608         }
2609
2610         if (!arg_machine) {
2611                 arg_machine = strdup(basename(arg_image ? arg_image : arg_directory));
2612                 if (!arg_machine) {
2613                         log_oom();
2614                         goto finish;
2615                 }
2616
2617                 hostname_cleanup(arg_machine, false);
2618                 if (isempty(arg_machine)) {
2619                         log_error("Failed to determine machine name automatically, please use -M.");
2620                         goto finish;
2621                 }
2622         }
2623
2624         if (geteuid() != 0) {
2625                 log_error("Need to be root.");
2626                 goto finish;
2627         }
2628
2629         if (sd_booted() <= 0) {
2630                 log_error("Not running on a systemd system.");
2631                 goto finish;
2632         }
2633
2634         log_close();
2635         n_fd_passed = sd_listen_fds(false);
2636         if (n_fd_passed > 0) {
2637                 k = fdset_new_listen_fds(&fds, false);
2638                 if (k < 0) {
2639                         log_error("Failed to collect file descriptors: %s", strerror(-k));
2640                         goto finish;
2641                 }
2642         }
2643         fdset_close_others(fds);
2644         log_open();
2645
2646         if (arg_directory) {
2647                 if (path_equal(arg_directory, "/")) {
2648                         log_error("Spawning container on root directory not supported.");
2649                         goto finish;
2650                 }
2651
2652                 if (arg_boot) {
2653                         if (path_is_os_tree(arg_directory) <= 0) {
2654                                 log_error("Directory %s doesn't look like an OS root directory (/etc/os-release is missing). Refusing.", arg_directory);
2655                                 goto finish;
2656                         }
2657                 } else {
2658                         const char *p;
2659
2660                         p = strappenda(arg_directory,
2661                                        argc > optind && path_is_absolute(argv[optind]) ? argv[optind] : "/usr/bin/");
2662                         if (access(p, F_OK) < 0) {
2663                                 log_error("Directory %s lacks the binary to execute or doesn't look like a binary tree. Refusing.", arg_directory);
2664                                 goto finish;
2665
2666                         }
2667                 }
2668         } else {
2669                 char template[] = "/tmp/nspawn-root-XXXXXX";
2670
2671                 if (!mkdtemp(template)) {
2672                         log_error("Failed to create temporary directory: %m");
2673                         r = -errno;
2674                         goto finish;
2675                 }
2676
2677                 arg_directory = strdup(template);
2678                 if (!arg_directory) {
2679                         r = log_oom();
2680                         goto finish;
2681                 }
2682
2683                 image_fd = setup_image(&device_path, &loop_nr);
2684                 if (image_fd < 0) {
2685                         r = image_fd;
2686                         goto finish;
2687                 }
2688
2689                 r = dissect_image(image_fd, &root_device, &root_device_rw, &home_device, &home_device_rw, &srv_device, &srv_device_rw, &secondary);
2690                 if (r < 0)
2691                         goto finish;
2692         }
2693
2694         master = posix_openpt(O_RDWR|O_NOCTTY|O_CLOEXEC|O_NDELAY);
2695         if (master < 0) {
2696                 log_error("Failed to acquire pseudo tty: %m");
2697                 goto finish;
2698         }
2699
2700         console = ptsname(master);
2701         if (!console) {
2702                 log_error("Failed to determine tty name: %m");
2703                 goto finish;
2704         }
2705
2706         if (!arg_quiet)
2707                 log_info("Spawning container %s on %s. Press ^] three times within 1s to abort execution.", arg_machine, arg_image ? arg_image : arg_directory);
2708
2709         if (unlockpt(master) < 0) {
2710                 log_error("Failed to unlock tty: %m");
2711                 goto finish;
2712         }
2713
2714         if (access("/dev/kdbus/control", F_OK) >= 0) {
2715
2716                 if (arg_share_system) {
2717                         kdbus_domain = strdup("/dev/kdbus");
2718                         if (!kdbus_domain) {
2719                                 log_oom();
2720                                 goto finish;
2721                         }
2722                 } else {
2723                         const char *ns;
2724
2725                         ns = strappenda("machine-", arg_machine);
2726                         kdbus_fd = bus_kernel_create_domain(ns, &kdbus_domain);
2727                         if (r < 0)
2728                                 log_debug("Failed to create kdbus domain: %s", strerror(-r));
2729                         else
2730                                 log_debug("Successfully created kdbus domain as %s", kdbus_domain);
2731                 }
2732         }
2733
2734         if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0, kmsg_socket_pair) < 0) {
2735                 log_error("Failed to create kmsg socket pair: %m");
2736                 goto finish;
2737         }
2738
2739         sd_notify(0, "READY=1");
2740
2741         assert_se(sigemptyset(&mask) == 0);
2742         sigset_add_many(&mask, SIGCHLD, SIGWINCH, SIGTERM, SIGINT, -1);
2743         assert_se(sigprocmask(SIG_BLOCK, &mask, NULL) == 0);
2744
2745         for (;;) {
2746                 int parent_ready_fd = -1, child_ready_fd = -1;
2747                 siginfo_t status;
2748                 eventfd_t x;
2749
2750                 parent_ready_fd = eventfd(0, EFD_CLOEXEC);
2751                 if (parent_ready_fd < 0) {
2752                         log_error("Failed to create event fd: %m");
2753                         goto finish;
2754                 }
2755
2756                 child_ready_fd = eventfd(0, EFD_CLOEXEC);
2757                 if (child_ready_fd < 0) {
2758                         log_error("Failed to create event fd: %m");
2759                         goto finish;
2760                 }
2761
2762                 pid = syscall(__NR_clone,
2763                               SIGCHLD|CLONE_NEWNS|
2764                               (arg_share_system ? 0 : CLONE_NEWIPC|CLONE_NEWPID|CLONE_NEWUTS)|
2765                               (arg_private_network ? CLONE_NEWNET : 0), NULL);
2766                 if (pid < 0) {
2767                         if (errno == EINVAL)
2768                                 log_error("clone() failed, do you have namespace support enabled in your kernel? (You need UTS, IPC, PID and NET namespacing built in): %m");
2769                         else
2770                                 log_error("clone() failed: %m");
2771
2772                         goto finish;
2773                 }
2774
2775                 if (pid == 0) {
2776                         /* child */
2777                         _cleanup_free_ char *home = NULL;
2778                         unsigned n_env = 2;
2779                         const char *envp[] = {
2780                                 "PATH=" DEFAULT_PATH_SPLIT_USR,
2781                                 "container=systemd-nspawn", /* LXC sets container=lxc, so follow the scheme here */
2782                                 NULL, /* TERM */
2783                                 NULL, /* HOME */
2784                                 NULL, /* USER */
2785                                 NULL, /* LOGNAME */
2786                                 NULL, /* container_uuid */
2787                                 NULL, /* LISTEN_FDS */
2788                                 NULL, /* LISTEN_PID */
2789                                 NULL
2790                         };
2791                         char **env_use;
2792
2793                         envp[n_env] = strv_find_prefix(environ, "TERM=");
2794                         if (envp[n_env])
2795                                 n_env ++;
2796
2797                         master = safe_close(master);
2798
2799                         close_nointr(STDIN_FILENO);
2800                         close_nointr(STDOUT_FILENO);
2801                         close_nointr(STDERR_FILENO);
2802
2803                         kmsg_socket_pair[0] = safe_close(kmsg_socket_pair[0]);
2804
2805                         reset_all_signal_handlers();
2806
2807                         assert_se(sigemptyset(&mask) == 0);
2808                         assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
2809
2810                         k = open_terminal(console, O_RDWR);
2811                         if (k != STDIN_FILENO) {
2812                                 if (k >= 0) {
2813                                         safe_close(k);
2814                                         k = -EINVAL;
2815                                 }
2816
2817                                 log_error("Failed to open console: %s", strerror(-k));
2818                                 goto child_fail;
2819                         }
2820
2821                         if (dup2(STDIN_FILENO, STDOUT_FILENO) != STDOUT_FILENO ||
2822                             dup2(STDIN_FILENO, STDERR_FILENO) != STDERR_FILENO) {
2823                                 log_error("Failed to duplicate console: %m");
2824                                 goto child_fail;
2825                         }
2826
2827                         if (setsid() < 0) {
2828                                 log_error("setsid() failed: %m");
2829                                 goto child_fail;
2830                         }
2831
2832                         if (reset_audit_loginuid() < 0)
2833                                 goto child_fail;
2834
2835                         if (prctl(PR_SET_PDEATHSIG, SIGKILL) < 0) {
2836                                 log_error("PR_SET_PDEATHSIG failed: %m");
2837                                 goto child_fail;
2838                         }
2839
2840                         /* Mark everything as slave, so that we still
2841                          * receive mounts from the real root, but don't
2842                          * propagate mounts to the real root. */
2843                         if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL) < 0) {
2844                                 log_error("MS_SLAVE|MS_REC failed: %m");
2845                                 goto child_fail;
2846                         }
2847
2848                         if (mount_devices(arg_directory,
2849                                           root_device, root_device_rw,
2850                                           home_device, home_device_rw,
2851                                           srv_device, srv_device_rw) < 0)
2852                                 goto child_fail;
2853
2854                         /* Turn directory into bind mount */
2855                         if (mount(arg_directory, arg_directory, "bind", MS_BIND|MS_REC, NULL) < 0) {
2856                                 log_error("Failed to make bind mount.");
2857                                 goto child_fail;
2858                         }
2859
2860                         if (arg_read_only)
2861                                 if (mount(arg_directory, arg_directory, "bind", MS_BIND|MS_REMOUNT|MS_RDONLY|MS_REC, NULL) < 0) {
2862                                         log_error("Failed to make read-only.");
2863                                         goto child_fail;
2864                                 }
2865
2866                         if (mount_all(arg_directory) < 0)
2867                                 goto child_fail;
2868
2869                         if (copy_devnodes(arg_directory) < 0)
2870                                 goto child_fail;
2871
2872                         if (setup_ptmx(arg_directory) < 0)
2873                                 goto child_fail;
2874
2875                         dev_setup(arg_directory);
2876
2877                         if (audit_still_doesnt_work_in_containers() < 0)
2878                                 goto child_fail;
2879
2880                         if (setup_dev_console(arg_directory, console) < 0)
2881                                 goto child_fail;
2882
2883                         if (setup_kmsg(arg_directory, kmsg_socket_pair[1]) < 0)
2884                                 goto child_fail;
2885
2886                         kmsg_socket_pair[1] = safe_close(kmsg_socket_pair[1]);
2887
2888                         if (setup_boot_id(arg_directory) < 0)
2889                                 goto child_fail;
2890
2891                         if (setup_timezone(arg_directory) < 0)
2892                                 goto child_fail;
2893
2894                         if (setup_resolv_conf(arg_directory) < 0)
2895                                 goto child_fail;
2896
2897                         if (setup_journal(arg_directory) < 0)
2898                                 goto child_fail;
2899
2900                         if (mount_binds(arg_directory, arg_bind, 0) < 0)
2901                                 goto child_fail;
2902
2903                         if (mount_binds(arg_directory, arg_bind_ro, MS_RDONLY) < 0)
2904                                 goto child_fail;
2905
2906                         if (setup_kdbus(arg_directory, kdbus_domain) < 0)
2907                                 goto child_fail;
2908
2909                         /* Tell the parent that we are ready, and that
2910                          * it can cgroupify us to that we lack access
2911                          * to certain devices and resources. */
2912                         eventfd_write(child_ready_fd, 1);
2913                         child_ready_fd = safe_close(child_ready_fd);
2914
2915                         if (chdir(arg_directory) < 0) {
2916                                 log_error("chdir(%s) failed: %m", arg_directory);
2917                                 goto child_fail;
2918                         }
2919
2920                         if (mount(arg_directory, "/", NULL, MS_MOVE, NULL) < 0) {
2921                                 log_error("mount(MS_MOVE) failed: %m");
2922                                 goto child_fail;
2923                         }
2924
2925                         if (chroot(".") < 0) {
2926                                 log_error("chroot() failed: %m");
2927                                 goto child_fail;
2928                         }
2929
2930                         if (chdir("/") < 0) {
2931                                 log_error("chdir() failed: %m");
2932                                 goto child_fail;
2933                         }
2934
2935                         umask(0022);
2936
2937                         if (arg_private_network)
2938                                 loopback_setup();
2939
2940                         if (drop_capabilities() < 0) {
2941                                 log_error("drop_capabilities() failed: %m");
2942                                 goto child_fail;
2943                         }
2944
2945                         r = change_uid_gid(&home);
2946                         if (r < 0)
2947                                 goto child_fail;
2948
2949                         if ((asprintf((char**)(envp + n_env++), "HOME=%s", home ? home: "/root") < 0) ||
2950                             (asprintf((char**)(envp + n_env++), "USER=%s", arg_user ? arg_user : "root") < 0) ||
2951                             (asprintf((char**)(envp + n_env++), "LOGNAME=%s", arg_user ? arg_user : "root") < 0)) {
2952                                 log_oom();
2953                                 goto child_fail;
2954                         }
2955
2956                         if (!sd_id128_equal(arg_uuid, SD_ID128_NULL)) {
2957                                 if (asprintf((char**)(envp + n_env++), "container_uuid=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(arg_uuid)) < 0) {
2958                                         log_oom();
2959                                         goto child_fail;
2960                                 }
2961                         }
2962
2963                         if (fdset_size(fds) > 0) {
2964                                 k = fdset_cloexec(fds, false);
2965                                 if (k < 0) {
2966                                         log_error("Failed to unset O_CLOEXEC for file descriptors.");
2967                                         goto child_fail;
2968                                 }
2969
2970                                 if ((asprintf((char **)(envp + n_env++), "LISTEN_FDS=%u", n_fd_passed) < 0) ||
2971                                     (asprintf((char **)(envp + n_env++), "LISTEN_PID=1") < 0)) {
2972                                         log_oom();
2973                                         goto child_fail;
2974                                 }
2975                         }
2976
2977                         setup_hostname();
2978
2979                         if (arg_personality != 0xffffffffLU) {
2980                                 if (personality(arg_personality) < 0) {
2981                                         log_error("personality() failed: %m");
2982                                         goto child_fail;
2983                                 }
2984                         } else if (secondary) {
2985                                 if (personality(PER_LINUX32) < 0) {
2986                                         log_error("personality() failed: %m");
2987                                         goto child_fail;
2988                                 }
2989                         }
2990
2991 #ifdef HAVE_SELINUX
2992                         if (arg_selinux_context)
2993                                 if (setexeccon((security_context_t) arg_selinux_context) < 0) {
2994                                         log_error("setexeccon(\"%s\") failed: %m", arg_selinux_context);
2995                                         goto child_fail;
2996                                 }
2997 #endif
2998
2999                         if (!strv_isempty(arg_setenv)) {
3000                                 char **n;
3001
3002                                 n = strv_env_merge(2, envp, arg_setenv);
3003                                 if (!n) {
3004                                         log_oom();
3005                                         goto child_fail;
3006                                 }
3007
3008                                 env_use = n;
3009                         } else
3010                                 env_use = (char**) envp;
3011
3012                         /* Wait until the parent is ready with the setup, too... */
3013                         eventfd_read(parent_ready_fd, &x);
3014                         parent_ready_fd = safe_close(parent_ready_fd);
3015
3016                         if (arg_boot) {
3017                                 char **a;
3018                                 size_t l;
3019
3020                                 /* Automatically search for the init system */
3021
3022                                 l = 1 + argc - optind;
3023                                 a = newa(char*, l + 1);
3024                                 memcpy(a + 1, argv + optind, l * sizeof(char*));
3025
3026                                 a[0] = (char*) "/usr/lib/systemd/systemd";
3027                                 execve(a[0], a, env_use);
3028
3029                                 a[0] = (char*) "/lib/systemd/systemd";
3030                                 execve(a[0], a, env_use);
3031
3032                                 a[0] = (char*) "/sbin/init";
3033                                 execve(a[0], a, env_use);
3034                         } else if (argc > optind)
3035                                 execvpe(argv[optind], argv + optind, env_use);
3036                         else {
3037                                 chdir(home ? home : "/root");
3038                                 execle("/bin/bash", "-bash", NULL, env_use);
3039                                 execle("/bin/sh", "-sh", NULL, env_use);
3040                         }
3041
3042                         log_error("execv() failed: %m");
3043
3044                 child_fail:
3045                         _exit(EXIT_FAILURE);
3046                 }
3047
3048                 fdset_free(fds);
3049                 fds = NULL;
3050
3051                 /* Wait until the child reported that it is ready with
3052                  * all it needs to do with priviliges. After we got
3053                  * the notification we can make the process join its
3054                  * cgroup which might limit what it can do */
3055                 eventfd_read(child_ready_fd, &x);
3056
3057                 r = register_machine(pid);
3058                 if (r < 0)
3059                         goto finish;
3060
3061                 r = move_network_interfaces(pid);
3062                 if (r < 0)
3063                         goto finish;
3064
3065                 r = setup_veth(pid, veth_name);
3066                 if (r < 0)
3067                         goto finish;
3068
3069                 r = setup_bridge(veth_name);
3070                 if (r < 0)
3071                         goto finish;
3072
3073                 r = setup_macvlan(pid);
3074                 if (r < 0)
3075                         goto finish;
3076
3077                 /* Notify the child that the parent is ready with all
3078                  * its setup, and thtat the child can now hand over
3079                  * control to the code to run inside the container. */
3080                 eventfd_write(parent_ready_fd, 1);
3081
3082                 k = process_pty(master, &mask, arg_boot ? pid : 0, SIGRTMIN+3);
3083                 if (k < 0) {
3084                         r = EXIT_FAILURE;
3085                         break;
3086                 }
3087
3088                 if (!arg_quiet)
3089                         putc('\n', stdout);
3090
3091                 /* Kill if it is not dead yet anyway */
3092                 terminate_machine(pid);
3093
3094                 /* Redundant, but better safe than sorry */
3095                 kill(pid, SIGKILL);
3096
3097                 k = wait_for_terminate(pid, &status);
3098                 pid = 0;
3099
3100                 if (k < 0) {
3101                         r = EXIT_FAILURE;
3102                         break;
3103                 }
3104
3105                 if (status.si_code == CLD_EXITED) {
3106                         r = status.si_status;
3107                         if (status.si_status != 0) {
3108                                 log_error("Container %s failed with error code %i.", arg_machine, status.si_status);
3109                                 break;
3110                         }
3111
3112                         if (!arg_quiet)
3113                                 log_debug("Container %s exited successfully.", arg_machine);
3114                         break;
3115                 } else if (status.si_code == CLD_KILLED &&
3116                            status.si_status == SIGINT) {
3117
3118                         if (!arg_quiet)
3119                                 log_info("Container %s has been shut down.", arg_machine);
3120                         r = 0;
3121                         break;
3122                 } else if (status.si_code == CLD_KILLED &&
3123                            status.si_status == SIGHUP) {
3124
3125                         if (!arg_quiet)
3126                                 log_info("Container %s is being rebooted.", arg_machine);
3127                         continue;
3128                 } else if (status.si_code == CLD_KILLED ||
3129                            status.si_code == CLD_DUMPED) {
3130
3131                         log_error("Container %s terminated by signal %s.", arg_machine, signal_to_string(status.si_status));
3132                         r = EXIT_FAILURE;
3133                         break;
3134                 } else {
3135                         log_error("Container %s failed due to unknown reason.", arg_machine);
3136                         r = EXIT_FAILURE;
3137                         break;
3138                 }
3139         }
3140
3141 finish:
3142         loop_remove(loop_nr, &image_fd);
3143
3144         if (pid > 0)
3145                 kill(pid, SIGKILL);
3146
3147         free(arg_directory);
3148         free(arg_machine);
3149         free(arg_user);
3150         strv_free(arg_setenv);
3151         strv_free(arg_network_interfaces);
3152         strv_free(arg_network_macvlan);
3153         strv_free(arg_bind);
3154         strv_free(arg_bind_ro);
3155
3156         return r;
3157 }