#include <signal.h>

#include <sched.h>

#include <unistd.h>

#include <sys/types.h>

#include <sys/syscall.h>

#include <sys/mount.h>

#include <sys/wait.h>

#include <stdlib.h>

#include <string.h>

#include <stdio.h>

#include <errno.h>

#include <sys/prctl.h>

#include <sys/capability.h>

#include <getopt.h>

#include <termios.h>

#include <sys/signalfd.h>

#include <grp.h>

#include <linux/fs.h>

#include <sys/un.h>

#include <sys/socket.h>

#include <linux/netlink.h>

#include <sys/eventfd.h>

#include <net/if.h>

#include <linux/veth.h>

#include <sys/personality.h>

#include <linux/loop.h>

#ifdef HAVE_SELINUX

#include <selinux/selinux.h>

#endif

#ifdef HAVE_SECCOMP

#include <seccomp.h>

#endif

#ifdef HAVE_BLKID

#include <blkid/blkid.h>

#endif

#include "sd-daemon.h"

#include "sd-bus.h"

#include "sd-id128.h"

#include "sd-rtnl.h"

#include "log.h"

#include "util.h"

#include "mkdir.h"

#include "macro.h"

#include "audit.h"

#include "missing.h"

#include "cgroup-util.h"

#include "strv.h"

#include "path-util.h"

#include "loopback-setup.h"

#include "dev-setup.h"

#include "fdset.h"

#include "build.h"

#include "fileio.h"

#include "bus-util.h"

#include "bus-error.h"

#include "ptyfwd.h"

#include "bus-kernel.h"

#include "env-util.h"

#include "def.h"

#include "rtnl-util.h"

#include "udev-util.h"

#include "eventfd-util.h"

#include "blkid-util.h"

#include "gpt.h"

#include "siphash24.h"

#include "copy.h"

#ifdef HAVE_SECCOMP

#include "seccomp-util.h"

#endif

typedef enum ContainerStatus {

CONTAINER_TERMINATED,

CONTAINER_REBOOTED

} ContainerStatus;

typedef enum LinkJournal {

LINK_NO,

LINK_AUTO,

LINK_HOST,

LINK_GUEST

} LinkJournal;

static char *arg_directory = NULL;

static char *arg_user = NULL;

static sd_id128_t arg_uuid = {};

static char *arg_machine = NULL;

static const char *arg_selinux_context = NULL;

static const char *arg_selinux_apifs_context = NULL;

static const char *arg_slice = NULL;

static bool arg_private_network = false;

static bool arg_read_only = false;

static bool arg_boot = false;

static LinkJournal arg_link_journal = LINK_AUTO;

static uint64_t arg_retain =

(1ULL << CAP_CHOWN) |

(1ULL << CAP_DAC_OVERRIDE) |

(1ULL << CAP_DAC_READ_SEARCH) |

(1ULL << CAP_FOWNER) |

(1ULL << CAP_FSETID) |

(1ULL << CAP_IPC_OWNER) |

(1ULL << CAP_KILL) |

(1ULL << CAP_LEASE) |

(1ULL << CAP_LINUX_IMMUTABLE) |

(1ULL << CAP_NET_BIND_SERVICE) |

(1ULL << CAP_NET_BROADCAST) |

(1ULL << CAP_NET_RAW) |

(1ULL << CAP_SETGID) |

(1ULL << CAP_SETFCAP) |

(1ULL << CAP_SETPCAP) |

(1ULL << CAP_SETUID) |

(1ULL << CAP_SYS_ADMIN) |

(1ULL << CAP_SYS_CHROOT) |

(1ULL << CAP_SYS_NICE) |

(1ULL << CAP_SYS_PTRACE) |

(1ULL << CAP_SYS_TTY_CONFIG) |

(1ULL << CAP_SYS_RESOURCE) |

(1ULL << CAP_SYS_BOOT) |

(1ULL << CAP_AUDIT_WRITE) |

(1ULL << CAP_AUDIT_CONTROL) |

(1ULL << CAP_MKNOD);

static char **arg_bind = NULL;

static char **arg_bind_ro = NULL;

static char **arg_setenv = NULL;

static bool arg_quiet = false;

static bool arg_share_system = false;

static bool arg_register = true;

static bool arg_keep_unit = false;

static char **arg_network_interfaces = NULL;

static char **arg_network_macvlan = NULL;

static bool arg_network_veth = false;

static const char *arg_network_bridge = NULL;

static unsigned long arg_personality = 0xffffffffLU;

static const char *arg_image = NULL;

static int help(void) {

printf("%s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n"

"Spawn a minimal namespace container for debugging, testing and building.\n\n"

" -h --help Show this help\n"

" --version Print version string\n"

" -q --quiet Do not show status information\n"

" -D --directory=PATH Root directory for the container\n"

" -i --image=PATH File system device or image for the container\n"

" -b --boot Boot up full system (i.e. invoke init)\n"

" -u --user=USER Run the command under specified user or uid\n"

" -M --machine=NAME Set the machine name for the container\n"

" --uuid=UUID Set a specific machine UUID for the container\n"

" -S --slice=SLICE Place the container in the specified slice\n"

" --private-network Disable network in container\n"

" --network-interface=INTERFACE\n"

" Assign an existing network interface to the\n"

" container\n"

" --network-macvlan=INTERFACE\n"

" Create a macvlan network interface based on an\n"

" existing network interface to the container\n"

" --network-veth Add a virtual ethernet connection between host\n"

" and container\n"

" --network-bridge=INTERFACE\n"

" Add a virtual ethernet connection between host\n"

" and container and add it to an existing bridge on\n"

" the host\n"

" -Z --selinux-context=SECLABEL\n"

" Set the SELinux security context to be used by\n"

" processes in the container\n"

" -L --selinux-apifs-context=SECLABEL\n"

" Set the SELinux security context to be used by\n"

" API/tmpfs file systems in the container\n"

" --capability=CAP In addition to the default, retain specified\n"

" capability\n"

" --drop-capability=CAP Drop the specified capability from the default set\n"

" --link-journal=MODE Link up guest journal, one of no, auto, guest, host\n"

" -j Equivalent to --link-journal=host\n"

" --read-only Mount the root directory read-only\n"

" --bind=PATH[:PATH] Bind mount a file or directory from the host into\n"

" the container\n"

" --bind-ro=PATH[:PATH] Similar, but creates a read-only bind mount\n"

" --setenv=NAME=VALUE Pass an environment variable to PID 1\n"

" --share-system Share system namespaces with host\n"

" --register=BOOLEAN Register container as machine\n"

" --keep-unit Do not register a scope for the machine, reuse\n"

" the service unit nspawn is running in\n",

program_invocation_short_name);

return 0;

}

static int parse_argv(int argc, char *argv[]) {

enum {

ARG_VERSION = 0x100,

ARG_PRIVATE_NETWORK,

ARG_UUID,

ARG_READ_ONLY,

ARG_CAPABILITY,

ARG_DROP_CAPABILITY,

ARG_LINK_JOURNAL,

ARG_BIND,

ARG_BIND_RO,

ARG_SETENV,

ARG_SHARE_SYSTEM,

ARG_REGISTER,

ARG_KEEP_UNIT,

ARG_NETWORK_INTERFACE,

ARG_NETWORK_MACVLAN,

ARG_NETWORK_VETH,

ARG_NETWORK_BRIDGE,

ARG_PERSONALITY,

};

static const struct option options[] = {

{ "help", no_argument, NULL, 'h' },

{ "version", no_argument, NULL, ARG_VERSION },

{ "directory", required_argument, NULL, 'D' },

{ "user", required_argument, NULL, 'u' },

{ "private-network", no_argument, NULL, ARG_PRIVATE_NETWORK },

{ "boot", no_argument, NULL, 'b' },

{ "uuid", required_argument, NULL, ARG_UUID },

{ "read-only", no_argument, NULL, ARG_READ_ONLY },

{ "capability", required_argument, NULL, ARG_CAPABILITY },

{ "drop-capability", required_argument, NULL, ARG_DROP_CAPABILITY },

{ "link-journal", required_argument, NULL, ARG_LINK_JOURNAL },

{ "bind", required_argument, NULL, ARG_BIND },

{ "bind-ro", required_argument, NULL, ARG_BIND_RO },

{ "machine", required_argument, NULL, 'M' },

{ "slice", required_argument, NULL, 'S' },

{ "setenv", required_argument, NULL, ARG_SETENV },

{ "selinux-context", required_argument, NULL, 'Z' },

{ "selinux-apifs-context", required_argument, NULL, 'L' },

{ "quiet", no_argument, NULL, 'q' },

{ "share-system", no_argument, NULL, ARG_SHARE_SYSTEM },

{ "register", required_argument, NULL, ARG_REGISTER },

{ "keep-unit", no_argument, NULL, ARG_KEEP_UNIT },

{ "network-interface", required_argument, NULL, ARG_NETWORK_INTERFACE },

{ "network-macvlan", required_argument, NULL, ARG_NETWORK_MACVLAN },

{ "network-veth", no_argument, NULL, ARG_NETWORK_VETH },

{ "network-bridge", required_argument, NULL, ARG_NETWORK_BRIDGE },

{ "personality", required_argument, NULL, ARG_PERSONALITY },

{ "image", required_argument, NULL, 'i' },

{}

};

int c, r;

uint64_t plus = 0, minus = 0;

assert(argc >= 0);

assert(argv);

while ((c = getopt_long(argc, argv, "+hD:u:bL:M:jS:Z:qi:", options, NULL)) >= 0) {

switch (c) {

case 'h':

return help();

case ARG_VERSION:

puts(PACKAGE_STRING);

puts(SYSTEMD_FEATURES);

return 0;

case 'D':

free(arg_directory);

arg_directory = canonicalize_file_name(optarg);

if (!arg_directory) {

log_error("Invalid root directory: %m");

return -ENOMEM;

}

break;

case 'i':

arg_image = optarg;

break;

case 'u':

free(arg_user);

arg_user = strdup(optarg);

if (!arg_user)

return log_oom();

break;

case ARG_NETWORK_BRIDGE:

arg_network_bridge = optarg;

/* fall through */

case ARG_NETWORK_VETH:

arg_network_veth = true;

arg_private_network = true;

break;

case ARG_NETWORK_INTERFACE:

if (strv_extend(&arg_network_interfaces, optarg) < 0)

return log_oom();

arg_private_network = true;

break;

case ARG_NETWORK_MACVLAN:

if (strv_extend(&arg_network_macvlan, optarg) < 0)

return log_oom();

/* fall through */

case ARG_PRIVATE_NETWORK:

arg_private_network = true;

break;

case 'b':

arg_boot = true;

break;

case ARG_UUID:

r = sd_id128_from_string(optarg, &arg_uuid);

if (r < 0) {

log_error("Invalid UUID: %s", optarg);

return r;

}

break;

case 'S':

arg_slice = optarg;

break;

case 'M':

if (isempty(optarg)) {

free(arg_machine);

arg_machine = NULL;

} else {

if (!hostname_is_valid(optarg)) {

log_error("Invalid machine name: %s", optarg);

return -EINVAL;

}

free(arg_machine);

arg_machine = strdup(optarg);

if (!arg_machine)

return log_oom();

break;

}

case 'Z':

arg_selinux_context = optarg;

break;

case 'L':

arg_selinux_apifs_context = optarg;

break;

case ARG_READ_ONLY:

arg_read_only = true;

break;

case ARG_CAPABILITY:

case ARG_DROP_CAPABILITY: {

char *state, *word;

size_t length;

FOREACH_WORD_SEPARATOR(word, length, optarg, ",", state) {

_cleanup_free_ char *t;

cap_value_t cap;

t = strndup(word, length);

if (!t)

return log_oom();

if (streq(t, "all")) {

if (c == ARG_CAPABILITY)

plus = (uint64_t) -1;

else

minus = (uint64_t) -1;

} else {

if (cap_from_name(t, &cap) < 0) {

log_error("Failed to parse capability %s.", t);

return -EINVAL;

}

if (c == ARG_CAPABILITY)

plus |= 1ULL << (uint64_t) cap;

else

minus |= 1ULL << (uint64_t) cap;

}

}

break;

}

case 'j':

arg_link_journal = LINK_GUEST;

break;

case ARG_LINK_JOURNAL:

if (streq(optarg, "auto"))

arg_link_journal = LINK_AUTO;

else if (streq(optarg, "no"))

arg_link_journal = LINK_NO;

else if (streq(optarg, "guest"))

arg_link_journal = LINK_GUEST;

else if (streq(optarg, "host"))

arg_link_journal = LINK_HOST;

else {

log_error("Failed to parse link journal mode %s", optarg);

return -EINVAL;

}

break;

case ARG_BIND:

case ARG_BIND_RO: {

_cleanup_free_ char *a = NULL, *b = NULL;

char *e;

char ***x;

x = c == ARG_BIND ? &arg_bind : &arg_bind_ro;

e = strchr(optarg, ':');

if (e) {

a = strndup(optarg, e - optarg);

b = strdup(e + 1);

} else {

a = strdup(optarg);

b = strdup(optarg);

}

if (!a || !b)

return log_oom();

if (!path_is_absolute(a) || !path_is_absolute(b)) {

log_error("Invalid bind mount specification: %s", optarg);

return -EINVAL;

}

r = strv_extend(x, a);

if (r < 0)

return log_oom();

r = strv_extend(x, b);

if (r < 0)

return log_oom();

break;

}

case ARG_SETENV: {

char **n;

if (!env_assignment_is_valid(optarg)) {

log_error("Environment variable assignment '%s' is not valid.", optarg);

return -EINVAL;

}

n = strv_env_set(arg_setenv, optarg);

if (!n)

return log_oom();

strv_free(arg_setenv);

arg_setenv = n;

break;

}

case 'q':

arg_quiet = true;

break;

case ARG_SHARE_SYSTEM:

arg_share_system = true;

break;

case ARG_REGISTER:

r = parse_boolean(optarg);

if (r < 0) {

log_error("Failed to parse --register= argument: %s", optarg);

return r;

}

arg_register = r;

break;

case ARG_KEEP_UNIT:

arg_keep_unit = true;

break;

case ARG_PERSONALITY:

arg_personality = personality_from_string(optarg);

if (arg_personality == 0xffffffffLU) {

log_error("Unknown or unsupported personality '%s'.", optarg);

return -EINVAL;

}

break;

case '?':

return -EINVAL;

default:

assert_not_reached("Unhandled option");

}

}

if (arg_share_system)

arg_register = false;

if (arg_boot && arg_share_system) {

log_error("--boot and --share-system may not be combined.");

return -EINVAL;

}

if (arg_keep_unit && cg_pid_get_owner_uid(0, NULL) >= 0) {

log_error("--keep-unit may not be used when invoked from a user session.");

return -EINVAL;

}

if (arg_directory && arg_image) {

log_error("--directory= and --image= may not be combined.");

return -EINVAL;

}

arg_retain = (arg_retain | plus | (arg_private_network ? 1ULL << CAP_NET_ADMIN : 0)) & ~minus;

return 1;

}

static int mount_all(const char *dest) {

typedef struct MountPoint {

const char *what;

const char *where;

const char *type;

const char *options;

unsigned long flags;

bool fatal;

} MountPoint;

static const MountPoint mount_table[] = {

{ "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true },

{ "/proc/sys", "/proc/sys", NULL, NULL, MS_BIND, true }, /* Bind mount first */

{ NULL, "/proc/sys", NULL, NULL, MS_BIND|MS_RDONLY|MS_REMOUNT, true }, /* Then, make it r/o */

{ "sysfs", "/sys", "sysfs", NULL, MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, true },

{ "tmpfs", "/dev", "tmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME, true },

{ "devpts", "/dev/pts", "devpts","newinstance,ptmxmode=0666,mode=620,gid=" STRINGIFY(TTY_GID), MS_NOSUID|MS_NOEXEC, true },

{ "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true },

{ "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true },

#ifdef HAVE_SELINUX

{ "/sys/fs/selinux", "/sys/fs/selinux", NULL, NULL, MS_BIND, false }, /* Bind mount first */

{ NULL, "/sys/fs/selinux", NULL, NULL, MS_BIND|MS_RDONLY|MS_REMOUNT, false }, /* Then, make it r/o */

#endif

};

unsigned k;

int r = 0;

for (k = 0; k < ELEMENTSOF(mount_table); k++) {

_cleanup_free_ char *where = NULL;

#ifdef HAVE_SELINUX

_cleanup_free_ char *options = NULL;

#endif

const char *o;

int t;

where = strjoin(dest, "/", mount_table[k].where, NULL);

if (!where)

return log_oom();

t = path_is_mount_point(where, true);

if (t < 0) {

log_error("Failed to detect whether %s is a mount point: %s", where, strerror(-t));

if (r == 0)

r = t;

continue;

}

/* Skip this entry if it is not a remount. */

if (mount_table[k].what && t > 0)

continue;

mkdir_p(where, 0755);

#ifdef HAVE_SELINUX

if (arg_selinux_apifs_context &&

(streq_ptr(mount_table[k].what, "tmpfs") || streq_ptr(mount_table[k].what, "devpts"))) {

options = strjoin(mount_table[k].options, ",context=\"", arg_selinux_apifs_context, "\"", NULL);

if (!options)

return log_oom();

o = options;

} else

#endif

o = mount_table[k].options;

if (mount(mount_table[k].what,

where,

mount_table[k].type,

mount_table[k].flags,

o) < 0 &&

mount_table[k].fatal) {

log_error("mount(%s) failed: %m", where);

if (r == 0)

r = -errno;

}

}

return r;

}

static int mount_binds(const char *dest, char **l, bool ro) {

char **x, **y;

STRV_FOREACH_PAIR(x, y, l) {

char *where;

struct stat source_st, dest_st;

int r;

if (stat(*x, &source_st) < 0) {

log_error("Failed to stat %s: %m", *x);

return -errno;

}

where = strappenda(dest, *y);

r = stat(where, &dest_st);

if (r == 0) {

if ((source_st.st_mode & S_IFMT) != (dest_st.st_mode & S_IFMT)) {

log_error("The file types of %s and %s do not match. Refusing bind mount",

*x, where);

return -EINVAL;

}

} else if (errno == ENOENT) {

r = mkdir_parents_label(where, 0755);

if (r < 0) {

log_error("Failed to bind mount %s: %s", *x, strerror(-r));

return r;

}

} else {

log_error("Failed to bind mount %s: %m", *x);

return -errno;

}

/* Create the mount point, but be conservative -- refuse to create block

if (S_ISDIR(source_st.st_mode))

mkdir_label(where, 0755);

else if (S_ISFIFO(source_st.st_mode))

mkfifo(where, 0644);

else if (S_ISSOCK(source_st.st_mode))

mknod(where, 0644 | S_IFSOCK, 0);

else if (S_ISREG(source_st.st_mode))

touch(where);

else {

log_error("Refusing to create mountpoint for file: %s", *x);

return -ENOTSUP;

}

if (mount(*x, where, "bind", MS_BIND, NULL) < 0) {

log_error("mount(%s) failed: %m", where);

return -errno;

}

if (ro) {

r = bind_remount_recursive(where, true);

if (r < 0) {

log_error("Read-Only bind mount failed: %s", strerror(-r));

return r;

}

}

}

return 0;

}

static int setup_timezone(const char *dest) {

_cleanup_free_ char *where = NULL, *p = NULL, *q = NULL, *check = NULL, *what = NULL;

char *z, *y;

int r;

assert(dest);

/* Fix the timezone, if possible */

r = readlink_malloc("/etc/localtime", &p);

if (r < 0) {

log_warning("/etc/localtime is not a symlink, not updating container timezone.");

return 0;

}

z = path_startswith(p, "../usr/share/zoneinfo/");

if (!z)

z = path_startswith(p, "/usr/share/zoneinfo/");

if (!z) {

log_warning("/etc/localtime does not point into /usr/share/zoneinfo/, not updating container timezone.");

return 0;

}

where = strappend(dest, "/etc/localtime");

if (!where)

return log_oom();

r = readlink_malloc(where, &q);

if (r >= 0) {

y = path_startswith(q, "../usr/share/zoneinfo/");

if (!y)

y = path_startswith(q, "/usr/share/zoneinfo/");

/* Already pointing to the right place? Then do nothing .. */

if (y && streq(y, z))

return 0;

}

check = strjoin(dest, "/usr/share/zoneinfo/", z, NULL);

if (!check)

return log_oom();

if (access(check, F_OK) < 0) {

log_warning("Timezone %s does not exist in container, not updating container timezone.", z);

return 0;

}

what = strappend("../usr/share/zoneinfo/", z);

if (!what)

return log_oom();

unlink(where);

if (symlink(what, where) < 0) {

log_error("Failed to correct timezone of container: %m");

return 0;

}

return 0;

}

static int setup_resolv_conf(const char *dest) {

char _cleanup_free_ *where = NULL;

assert(dest);

if (arg_private_network)

return 0;

/* Fix resolv.conf, if possible */

where = strappend(dest, "/etc/resolv.conf");

if (!where)

return log_oom();

/* We don't really care for the results of this really. If it

copy_file("/etc/resolv.conf", where, O_TRUNC|O_NOFOLLOW, 0644);

return 0;

}

static char* id128_format_as_uuid(sd_id128_t id, char s[37]) {

snprintf(s, 37,

"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",

SD_ID128_FORMAT_VAL(id));

return s;

}

static int setup_boot_id(const char *dest) {

_cleanup_free_ char *from = NULL, *to = NULL;

sd_id128_t rnd = {};

char as_uuid[37];

int r;

assert(dest);

if (arg_share_system)

return 0;

/* Generate a new randomized boot ID, so that each boot-up of

from = strappend(dest, "/dev/proc-sys-kernel-random-boot-id");

to = strappend(dest, "/proc/sys/kernel/random/boot_id");

if (!from || !to)

return log_oom();

r = sd_id128_randomize(&rnd);

if (r < 0) {

log_error("Failed to generate random boot id: %s", strerror(-r));

return r;

}

id128_format_as_uuid(rnd, as_uuid);

r = write_string_file(from, as_uuid);

if (r < 0) {

log_error("Failed to write boot id: %s", strerror(-r));

return r;

}

if (mount(from, to, "bind", MS_BIND, NULL) < 0) {

log_error("Failed to bind mount boot id: %m");

r = -errno;

} else if (mount(from, to, "bind", MS_BIND|MS_REMOUNT|MS_RDONLY, NULL))

log_warning("Failed to make boot id read-only: %m");

unlink(from);

return r;

}

static int copy_devnodes(const char *dest) {

static const char devnodes[] =

"null\0"

"zero\0"

"full\0"

"random\0"

"urandom\0"

"tty\0";

const char *d;

int r = 0;

_cleanup_umask_ mode_t u;

assert(dest);

u = umask(0000);

NULSTR_FOREACH(d, devnodes) {

_cleanup_free_ char *from = NULL, *to = NULL;

struct stat st;

from = strappend("/dev/", d);

to = strjoin(dest, "/dev/", d, NULL);

if (!from || !to)

return log_oom();

if (stat(from, &st) < 0) {

if (errno != ENOENT) {

log_error("Failed to stat %s: %m", from);

return -errno;

}

} else if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) {

log_error("%s is not a char or block device, cannot copy", from);

return -EIO;

} else if (mknod(to, st.st_mode, st.st_rdev) < 0) {

log_error("mknod(%s) failed: %m", dest);

return -errno;

}

}

return r;

}

static int setup_ptmx(const char *dest) {

_cleanup_free_ char *p = NULL;

p = strappend(dest, "/dev/ptmx");

if (!p)

return log_oom();

if (symlink("pts/ptmx", p) < 0) {

log_error("Failed to create /dev/ptmx symlink: %m");

return -errno;

}

return 0;

}

static int setup_dev_console(const char *dest, const char *console) {

_cleanup_umask_ mode_t u;

const char *to;

struct stat st;

int r;

assert(dest);

assert(console);

u = umask(0000);

if (stat("/dev/null", &st) < 0) {

log_error("Failed to stat /dev/null: %m");

return -errno;

}

r = chmod_and_chown(console, 0600, 0, 0);

if (r < 0) {

log_error("Failed to correct access mode for TTY: %s", strerror(-r));

return r;

}

/* We need to bind mount the right tty to /dev/console since

to = strappenda(dest, "/dev/console");

if (mknod(to, (st.st_mode & ~07777) | 0600, st.st_rdev) < 0) {

log_error("mknod() for /dev/console failed: %m");

return -errno;

}

if (mount(console, to, "bind", MS_BIND, NULL) < 0) {

log_error("Bind mount for /dev/console failed: %m");

return -errno;

}

return 0;

}

static int setup_kmsg(const char *dest, int kmsg_socket) {

_cleanup_free_ char *from = NULL, *to = NULL;

int r, fd, k;

_cleanup_umask_ mode_t u;

union {

struct cmsghdr cmsghdr;

uint8_t buf[CMSG_SPACE(sizeof(int))];

} control = {};

struct msghdr mh = {

.msg_control = &control,

.msg_controllen = sizeof(control),

};

struct cmsghdr *cmsg;

assert(dest);

assert(kmsg_socket >= 0);

u = umask(0000);

/* We create the kmsg FIFO as /dev/kmsg, but immediately

if (asprintf(&from, "%s/dev/kmsg", dest) < 0 ||

asprintf(&to, "%s/proc/kmsg", dest) < 0)

return log_oom();

if (mkfifo(from, 0600) < 0) {

log_error("mkfifo() for /dev/kmsg failed: %m");

return -errno;

}

r = chmod_and_chown(from, 0600, 0, 0);

if (r < 0) {

log_error("Failed to correct access mode for /dev/kmsg: %s", strerror(-r));

return r;

}

if (mount(from, to, "bind", MS_BIND, NULL) < 0) {

log_error("Bind mount for /proc/kmsg failed: %m");

return -errno;

}

fd = open(from, O_RDWR|O_NDELAY|O_CLOEXEC);

if (fd < 0) {

log_error("Failed to open fifo: %m");

return -errno;

}

cmsg = CMSG_FIRSTHDR(&mh);

cmsg->cmsg_level = SOL_SOCKET;

cmsg->cmsg_type = SCM_RIGHTS;

cmsg->cmsg_len = CMSG_LEN(sizeof(int));

memcpy(CMSG_DATA(cmsg), &fd, sizeof(int));

mh.msg_controllen = cmsg->cmsg_len;

/* Store away the fd in the socket, so that it stays open as

k = sendmsg(kmsg_socket, &mh, MSG_DONTWAIT|MSG_NOSIGNAL);

safe_close(fd);

if (k < 0) {

log_error("Failed to send FIFO fd: %m");

return -errno;

}

/* And now make the FIFO unavailable as /dev/kmsg... */

unlink(from);

return 0;

}

static int setup_hostname(void) {

if (arg_share_system)

return 0;

if (sethostname(arg_machine, strlen(arg_machine)) < 0)

return -errno;

return 0;

}

static int setup_journal(const char *directory) {

sd_id128_t machine_id, this_id;

_cleanup_free_ char *p = NULL, *b = NULL, *q = NULL, *d = NULL;

char *id;

int r;

p = strappend(directory, "/etc/machine-id");

if (!p)

return log_oom();

r = read_one_line_file(p, &b);

if (r == -ENOENT && arg_link_journal == LINK_AUTO)

return 0;

else if (r < 0) {

log_error("Failed to read machine ID from %s: %s", p, strerror(-r));

return r;

}

id = strstrip(b);

if (isempty(id) && arg_link_journal == LINK_AUTO)

return 0;

/* Verify validity */

r = sd_id128_from_string(id, &machine_id);

if (r < 0) {

log_error("Failed to parse machine ID from %s: %s", p, strerror(-r));

return r;

}

r = sd_id128_get_machine(&this_id);

if (r < 0) {

log_error("Failed to retrieve machine ID: %s", strerror(-r));

return r;

}

if (sd_id128_equal(machine_id, this_id)) {

log_full(arg_link_journal == LINK_AUTO ? LOG_WARNING : LOG_ERR,

"Host and machine ids are equal (%s): refusing to link journals", id);

if (arg_link_journal == LINK_AUTO)

return 0;

return

-EEXIST;

}

if (arg_link_journal == LINK_NO)

return 0;

free(p);

p = strappend("/var/log/journal/", id);

q = strjoin(directory, "/var/log/journal/", id, NULL);

if (!p || !q)

return log_oom();

if (path_is_mount_point(p, false) > 0) {

if (arg_link_journal != LINK_AUTO) {

log_error("%s: already a mount point, refusing to use for journal", p);

return -EEXIST;

}

return 0;

}

if (path_is_mount_point(q, false) > 0) {

if (arg_link_journal != LINK_AUTO) {

log_error("%s: already a mount point, refusing to use for journal", q);

return -EEXIST;

}

return 0;

}

r = readlink_and_make_absolute(p, &d);

if (r >= 0) {

if ((arg_link_journal == LINK_GUEST ||

arg_link_journal == LINK_AUTO) &&

path_equal(d, q)) {

r = mkdir_p(q, 0755);

if (r < 0)

log_warning("failed to create directory %s: %m", q);

return 0;

}

if (unlink(p) < 0) {

log_error("Failed to remove symlink %s: %m", p);

return -errno;

}

} else if (r == -EINVAL) {

if (arg_link_journal == LINK_GUEST &&

rmdir(p) < 0) {

if (errno == ENOTDIR) {

log_error("%s already exists and is neither a symlink nor a directory", p);

return r;

} else {

log_error("Failed to remove %s: %m", p);

return -errno;

}

}

} else if (r != -ENOENT) {

log_error("readlink(%s) failed: %m", p);

return r;

}

if (arg_link_journal == LINK_GUEST) {

if (symlink(q, p) < 0) {

log_error("Failed to symlink %s to %s: %m", q, p);

return -errno;

}

r = mkdir_p(q, 0755);

if (r < 0)

log_warning("failed to create directory %s: %m", q);

return 0;

}

if (arg_link_journal == LINK_HOST) {

r = mkdir_p(p, 0755);

if (r < 0) {

log_error("Failed to create %s: %m", p);

return r;

}

} else if (access(p, F_OK) < 0)

return 0;

if (dir_is_empty(q) == 0)

log_warning("%s is not empty, proceeding anyway.", q);

r = mkdir_p(q, 0755);

if (r < 0) {

log_error("Failed to create %s: %m", q);

return r;

}

if (mount(p, q, "bind", MS_BIND, NULL) < 0) {

log_error("Failed to bind mount journal from host into guest: %m");

return -errno;

}

return 0;

}

static int setup_kdbus(const char *dest, const char *path) {

const char *p;

if (!path)

return 0;

p = strappenda(dest, "/dev/kdbus");

if (mkdir(p, 0755) < 0) {

log_error("Failed to create kdbus path: %m");

return -errno;

}

if (mount(path, p, "bind", MS_BIND, NULL) < 0) {

log_error("Failed to mount kdbus domain path: %m");

return -errno;

}

return 0;

}

static int drop_capabilities(void) {

return capability_bounding_set_drop(~arg_retain, false);

}

static int register_machine(pid_t pid) {

_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;

_cleanup_bus_unref_ sd_bus *bus = NULL;

int r;

if (!arg_register)

return 0;

r = sd_bus_default_system(&bus);

if (r < 0) {

log_error("Failed to open system bus: %s", strerror(-r));

return r;

}

if (arg_keep_unit) {

r = sd_bus_call_method(

bus,

"org.freedesktop.machine1",

"/org/freedesktop/machine1",

"org.freedesktop.machine1.Manager",

"RegisterMachine",

&error,

NULL,

"sayssus",

arg_machine,

SD_BUS_MESSAGE_APPEND_ID128(arg_uuid),

"nspawn",

"container",

(uint32_t) pid,

strempty(arg_directory));

} else {

_cleanup_bus_message_unref_ sd_bus_message *m = NULL;

r = sd_bus_message_new_method_call(

bus,

&m,

"org.freedesktop.machine1",

"/org/freedesktop/machine1",

"org.freedesktop.machine1.Manager",

"CreateMachine");

if (r < 0) {

log_error("Failed to create message: %s", strerror(-r));

return r;

}

r = sd_bus_message_append(

m,

"sayssus",

arg_machine,

SD_BUS_MESSAGE_APPEND_ID128(arg_uuid),

"nspawn",

"container",

(uint32_t) pid,

strempty(arg_directory));

if (r < 0) {

log_error("Failed to append message arguments: %s", strerror(-r));

return r;

}

r = sd_bus_message_open_container(m, 'a', "(sv)");

if (r < 0) {

log_error("Failed to open container: %s", strerror(-r));

return r;

}

if (!isempty(arg_slice)) {

r = sd_bus_message_append(m, "(sv)", "Slice", "s", arg_slice);

if (r < 0) {

log_error("Failed to append slice: %s", strerror(-r));

return r;

}

}

r = sd_bus_message_append(m, "(sv)", "DevicePolicy", "s", "strict");

if (r < 0) {

log_error("Failed to add device policy: %s", strerror(-r));

return r;

}

r = sd_bus_message_append(m, "(sv)", "DeviceAllow", "a(ss)", 10,

/* Allow the container to

"/dev/null", "rwm",

"/dev/zero", "rwm",

"/dev/full", "rwm",

"/dev/random", "rwm",

"/dev/urandom", "rwm",

"/dev/tty", "rwm",

/* Allow the container

"/dev/pts/ptmx", "rw",

"char-pts", "rw",

/* Allow the container

"char-kdbus", "rw",

"char-kdbus/*", "rw");

if (r < 0) {

log_error("Failed to add device whitelist: %s", strerror(-r));

return r;

}

r = sd_bus_message_close_container(m);

if (r < 0) {

log_error("Failed to close container: %s", strerror(-r));

return r;

}

r = sd_bus_call(bus, m, 0, &error, NULL);

}

if (r < 0) {

log_error("Failed to register machine: %s", bus_error_message(&error, r));

return r;

}

return 0;

}

static int terminate_machine(pid_t pid) {

_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;

_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;

_cleanup_bus_unref_ sd_bus *bus = NULL;

const char *path;

int r;

if (!arg_register)

return 0;

r = sd_bus_default_system(&bus);

if (r < 0) {

log_error("Failed to open system bus: %s", strerror(-r));

return r;

}

r = sd_bus_call_method(

bus,

"org.freedesktop.machine1",

"/org/freedesktop/machine1",

"org.freedesktop.machine1.Manager",

"GetMachineByPID",

&error,

&reply,

"u",

(uint32_t) pid);

if (r < 0) {

/* Note that the machine might already have been

log_debug("Failed to get machine: %s", bus_error_message(&error, r));

return 0;

}

r = sd_bus_message_read(reply, "o", &path);

if (r < 0)

return bus_log_parse_error(r);

r = sd_bus_call_method(

bus,

"org.freedesktop.machine1",

path,

"org.freedesktop.machine1.Machine",

"Terminate",

&error,

NULL,

NULL);

if (r < 0) {

log_debug("Failed to terminate machine: %s", bus_error_message(&error, r));

return 0;

}

return 0;

}

static int reset_audit_loginuid(void) {

_cleanup_free_ char *p = NULL;

int r;

if (arg_share_system)

return 0;

r = read_one_line_file("/proc/self/loginuid", &p);

if (r == -ENOENT)

return 0;

if (r < 0) {

log_error("Failed to read /proc/self/loginuid: %s", strerror(-r));

return r;

}

/* Already reset? */

if (streq(p, "4294967295"))

return 0;

r = write_string_file("/proc/self/loginuid", "4294967295");

if (r < 0) {

log_error("Failed to reset audit login UID. This probably means that your kernel is too\n"

"old and you have audit enabled. Note that the auditing subsystem is known to\n"

"be incompatible with containers on old kernels. Please make sure to upgrade\n"

"your kernel or to off auditing with 'audit=0' on the kernel command line before\n"

"using systemd-nspawn. Sleeping for 5s... (%s)\n", strerror(-r));

sleep(5);

}

return 0;

}

#define HASH_KEY SD_ID128_MAKE(c3,c4,f9,19,b5,57,b2,1c,e6,cf,14,27,03,9c,ee,a2)

static int get_mac(struct ether_addr *mac) {

int r;

uint8_t result[8];

size_t l, sz;

uint8_t *v;

l = strlen(arg_machine);

sz = sizeof(sd_id128_t) + l;

v = alloca(sz);

/* fetch some persistent data unique to the host */

r = sd_id128_get_machine((sd_id128_t*) v);

if (r < 0)

return r;

/* combine with some data unique (on this host) to this

memcpy(v + sizeof(sd_id128_t), arg_machine, l);

/* Let's hash the host machine ID plus the container name. We

siphash24(result, v, sz, HASH_KEY.bytes);

assert_cc(ETH_ALEN <= sizeof(result));

memcpy(mac->ether_addr_octet, result, ETH_ALEN);

/* see eth_random_addr in the kernel */

mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */

mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */

return 0;

}

static int setup_veth(pid_t pid, char iface_name[IFNAMSIZ]) {

_cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;

_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;

struct ether_addr mac;

int r;

if (!arg_private_network)

return 0;

if (!arg_network_veth)

return 0;

/* Use two different interface name prefixes depending whether

if (arg_network_bridge)

memcpy(iface_name, "vb-", 3);

else

memcpy(iface_name, "ve-", 3);

strncpy(iface_name+3, arg_machine, IFNAMSIZ - 3);

r = get_mac(&mac);

if (r < 0) {

log_error("Failed to generate predictable MAC address for host0");

return r;

}

r = sd_rtnl_open(&rtnl, 0);

if (r < 0) {

log_error("Failed to connect to netlink: %s", strerror(-r));

return r;

}

r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);

if (r < 0) {

log_error("Failed to allocate netlink message: %s", strerror(-r));

return r;

}

r = sd_rtnl_message_append_string(m, IFLA_IFNAME, iface_name);

if (r < 0) {

log_error("Failed to add netlink interface name: %s", strerror(-r));

return r;

}

r = sd_rtnl_message_open_container(m, IFLA_LINKINFO);

if (r < 0) {

log_error("Failed to open netlink container: %s", strerror(-r));

return r;

}

r = sd_rtnl_message_open_container_union(m, IFLA_INFO_DATA, "veth");

if (r < 0) {

log_error("Failed to open netlink container: %s", strerror(-r));

return r;

}

r = sd_rtnl_message_open_container(m, VETH_INFO_PEER);

if (r < 0) {

log_error("Failed to open netlink container: %s", strerror(-r));

return r;

}

r = sd_rtnl_message_append_string(m, IFLA_IFNAME, "host0");

if (r < 0) {

log_error("Failed to add netlink interface name: %s", strerror(-r));

return r;

}

r = sd_rtnl_message_append_ether_addr(m, IFLA_ADDRESS, &mac);

if (r < 0) {

log_error("Failed to add netlink MAC address: %s", strerror(-r));

return r;

}

r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid);

if (r < 0) {

log_error("Failed to add netlink namespace field: %s", strerror(-r));

return r;

}

r = sd_rtnl_message_close_container(m);

if (r < 0) {

log_error("Failed to close netlink container: %s", strerror(-r));

return r;

}

r = sd_rtnl_message_close_container(m);

if (r < 0) {

log_error("Failed to close netlink container: %s", strerror(-r));

return r;

}

r = sd_rtnl_message_close_container(m);

if (r < 0) {

log_error("Failed to close netlink container: %s", strerror(-r));

return r;

}

r = sd_rtnl_call(rtnl, m, 0, NULL);

if (r < 0) {

log_error("Failed to add new veth interfaces: %s", strerror(-r));

return r;

}

return 0;

}

static int setup_bridge(const char veth_name[]) {

_cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;

_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;

int r, bridge;

if (!arg_private_network)

return 0;

if (!arg_network_veth)

return 0;

if (!arg_network_bridge)

return 0;

bridge = (int) if_nametoindex(arg_network_bridge);

if (bridge <= 0) {

log_error("Failed to resolve interface %s: %m", arg_network_bridge);

return -errno;

}

r = sd_rtnl_open(&rtnl, 0);

if (r < 0) {

log_error("Failed to connect to netlink: %s", strerror(-r));

return r;

}

r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, 0);

if (r < 0) {

log_error("Failed to allocate netlink message: %s", strerror(-r));

return r;

}

r = sd_rtnl_message_link_set_flags(m, IFF_UP, IFF_UP);

if (r < 0) {

log_error("Failed to set IFF_UP flag: %s", strerror(-r));

return r;

}

r = sd_rtnl_message_append_string(m, IFLA_IFNAME, veth_name);

if (r < 0) {

log_error("Failed to add netlink interface name field: %s", strerror(-r));

return r;

}

r = sd_rtnl_message_append_u32(m, IFLA_MASTER, bridge);

if (r < 0) {

log_error("Failed to add netlink master field: %s", strerror(-r));

return r;

}

r = sd_rtnl_call(rtnl, m, 0, NULL);

if (r < 0) {

log_error("Failed to add veth interface to bridge: %s", strerror(-r));

return r;

}

return 0;

}

static int parse_interface(struct udev *udev, const char *name) {

_cleanup_udev_device_unref_ struct udev_device *d = NULL;

char ifi_str[2 + DECIMAL_STR_MAX(int)];

int ifi;

ifi = (int) if_nametoindex(name);

if (ifi <= 0) {

log_error("Failed to resolve interface %s: %m", name);

return -errno;

}

sprintf(ifi_str, "n%i", ifi);

d = udev_device_new_from_device_id(udev, ifi_str);

if (!d) {

log_error("Failed to get udev device for interface %s: %m", name);

return -errno;

}

if (udev_device_get_is_initialized(d) <= 0) {

log_error("Network interface %s is not initialized yet.", name);

return -EBUSY;

}

return ifi;

}

static int move_network_interfaces(pid_t pid) {

_cleanup_udev_unref_ struct udev *udev = NULL;

_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;

char **i;

int r;

if (!arg_private_network)

return 0;

if (strv_isempty(arg_network_interfaces))

return 0;

r = sd_rtnl_open(&rtnl, 0);

if (r < 0) {

log_error("Failed to connect to netlink: %s", strerror(-r));

return r;

}

udev = udev_new();

if (!udev) {

log_error("Failed to connect to udev.");

return -ENOMEM;

}

STRV_FOREACH(i, arg_network_interfaces) {

_cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;

int ifi;

ifi = parse_interface(udev, *i);

if (ifi < 0)

return ifi;

r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, ifi);

if (r < 0) {

log_error("Failed to allocate netlink message: %s", strerror(-r));

return r;

}

r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid);

if (r < 0) {

log_error("Failed to append namespace PID to netlink message: %s", strerror(-r));

return r;

}

r = sd_rtnl_call(rtnl, m, 0, NULL);

if (r < 0) {

log_error("Failed to move interface %s to namespace: %s", *i, strerror(-r));

return r;

}

}

return 0;

}

static int setup_macvlan(pid_t pid) {

_cleanup_udev_unref_ struct udev *udev = NULL;

_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;

char **i;

int r;

if (!arg_private_network)

return 0;

if (strv_isempty(arg_network_macvlan))

return 0;

r = sd_rtnl_open(&rtnl, 0);

if (r < 0) {

log_error("Failed to connect to netlink: %s", strerror(-r));

return r;

}

udev = udev_new();

if (!udev) {

log_error("Failed to connect to udev.");

return -ENOMEM;

}

STRV_FOREACH(i, arg_network_macvlan) {

_cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;

_cleanup_free_ char *n = NULL;

int ifi;

ifi = parse_interface(udev, *i);

if (ifi < 0)

return ifi;

r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);

if (r < 0) {

log_error("Failed to allocate netlink message: %s", strerror(-r));

return r;

}

r = sd_rtnl_message_append_u32(m, IFLA_LINK, ifi);

if (r < 0) {

log_error("Failed to add netlink interface index: %s", strerror(-r));

return r;

}

n = strappend("mv-", *i);

if (!n)

return log_oom();

strshorten(n, IFNAMSIZ-1);

r = sd_rtnl_message_append_string(m, IFLA_IFNAME, n);

if (r < 0) {

log_error("Failed to add netlink interface name: %s", strerror(-r));

return r;

}

r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid);

if (r < 0) {

log_error("Failed to add netlink namespace field: %s", strerror(-r));

return r;

}

r = sd_rtnl_message_open_container(m, IFLA_LINKINFO);

if (r < 0) {

log_error("Failed to open netlink container: %s", strerror(-r));

return r;

}

r = sd_rtnl_message_open_container_union(m, IFLA_INFO_DATA, "macvlan");

if (r < 0) {

log_error("Failed to open netlink container: %s", strerror(-r));

return r;

}

r = sd_rtnl_message_append_u32(m, IFLA_MACVLAN_MODE, MACVLAN_MODE_BRIDGE);

if (r < 0) {

log_error("Failed to append macvlan mode: %s", strerror(-r));

return r;

}

r = sd_rtnl_message_close_container(m);

if (r < 0) {

log_error("Failed to close netlink container: %s", strerror(-r));

return r;

}

r = sd_rtnl_message_close_container(m);

if (r < 0) {

log_error("Failed to close netlink container: %s", strerror(-r));

return r;

}

r = sd_rtnl_call(rtnl, m, 0, NULL);

if (r < 0) {

log_error("Failed to add new macvlan interfaces: %s", strerror(-r));

return r;

}

}

return 0;

}

static int audit_still_doesnt_work_in_containers(void) {

#ifdef HAVE_SECCOMP

scmp_filter_ctx seccomp;

int r;

/*

seccomp = seccomp_init(SCMP_ACT_ALLOW);

if (!seccomp)

return log_oom();

r = seccomp_add_secondary_archs(seccomp);

if (r < 0) {

log_error("Failed to add secondary archs to seccomp filter: %s", strerror(-r));

goto finish;

}

r = seccomp_rule_add(

seccomp,

SCMP_ACT_ERRNO(EAFNOSUPPORT),

SCMP_SYS(socket),

2,

SCMP_A0(SCMP_CMP_EQ, AF_NETLINK),

SCMP_A2(SCMP_CMP_EQ, NETLINK_AUDIT));

if (r < 0) {

log_error("Failed to add audit seccomp rule: %s", strerror(-r));

goto finish;

}

r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);

if (r < 0) {

log_error("Failed to unset NO_NEW_PRIVS: %s", strerror(-r));

goto finish;

}

r = seccomp_load(seccomp);

if (r < 0)

log_error("Failed to install seccomp audit filter: %s", strerror(-r));

finish:

seccomp_release(seccomp);

return r;

#else

return 0;

#endif

}

static int setup_image(char **device_path, int *loop_nr) {

struct loop_info64 info = {

.lo_flags = LO_FLAGS_AUTOCLEAR|LO_FLAGS_PARTSCAN

};

_cleanup_close_ int fd = -1, control = -1, loop = -1;

_cleanup_free_ char* loopdev = NULL;

struct stat st;

int r, nr;

assert(device_path);

assert(loop_nr);

fd = open(arg_image, O_CLOEXEC|(arg_read_only ? O_RDONLY : O_RDWR)|O_NONBLOCK|O_NOCTTY);

if (fd < 0) {

log_error("Failed to open %s: %m", arg_image);

return -errno;

}

if (fstat(fd, &st) < 0) {

log_error("Failed to stat %s: %m", arg_image);

return -errno;

}

if (S_ISBLK(st.st_mode)) {

char *p;

p = strdup(arg_image);

if (!p)

return log_oom();

*device_path = p;

*loop_nr = -1;

r = fd;

fd = -1;

return r;

}

if (!S_ISREG(st.st_mode)) {

log_error("%s is not a regular file or block device: %m", arg_image);

return -EINVAL;

}

control = open("/dev/loop-control", O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);

if (control < 0) {

log_error("Failed to open /dev/loop-control: %m");

return -errno;

}

nr = ioctl(control, LOOP_CTL_GET_FREE);

if (nr < 0) {

log_error("Failed to allocate loop device: %m");

return -errno;

}

if (asprintf(&loopdev, "/dev/loop%i", nr) < 0)

return log_oom();

loop = open(loopdev, O_CLOEXEC|(arg_read_only ? O_RDONLY : O_RDWR)|O_NONBLOCK|O_NOCTTY);

if (loop < 0) {

log_error("Failed to open loop device %s: %m", loopdev);

return -errno;

}

if (ioctl(loop, LOOP_SET_FD, fd) < 0) {

log_error("Failed to set loopback file descriptor on %s: %m", loopdev);

return -errno;

}

if (arg_read_only)

info.lo_flags |= LO_FLAGS_READ_ONLY;

if (ioctl(loop, LOOP_SET_STATUS64, &info) < 0) {

log_error("Failed to set loopback settings on %s: %m", loopdev);

return -errno;

}

*device_path = loopdev;

loopdev = NULL;

*loop_nr = nr;

r = loop;

loop = -1;

return r;

}

static int dissect_image(

int fd,

char **root_device, bool *root_device_rw,

char **home_device, bool *home_device_rw,

char **srv_device, bool *srv_device_rw,

bool *secondary) {

#ifdef HAVE_BLKID

int home_nr = -1, root_nr = -1, secondary_root_nr = -1, srv_nr = -1;

_cleanup_free_ char *home = NULL, *root = NULL, *secondary_root = NULL, *srv = NULL;

_cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;

_cleanup_udev_device_unref_ struct udev_device *d = NULL;

_cleanup_blkid_free_probe_ blkid_probe b = NULL;

_cleanup_udev_unref_ struct udev *udev = NULL;

struct udev_list_entry *first, *item;

bool home_rw = true, root_rw = true, secondary_root_rw = true, srv_rw = true;

const char *pttype = NULL;

blkid_partlist pl;

struct stat st;

int r;

assert(fd >= 0);

assert(root_device);

assert(home_device);

assert(srv_device);

assert(secondary);

b = blkid_new_probe();

if (!b)

return log_oom();

errno = 0;

r = blkid_probe_set_device(b, fd, 0, 0);

if (r != 0) {

if (errno == 0)

return log_oom();

log_error("Failed to set device on blkid probe: %m");

return -errno;

}

blkid_probe_enable_partitions(b, 1);

blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS);

errno = 0;

r = blkid_do_safeprobe(b);

if (r == -2 || r == 1) {

log_error("Failed to identify any partition table on %s.\n"

"Note that the disk image needs to follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/ to be supported by systemd-nspawn.", arg_image);

return -EINVAL;

} else if (r != 0) {

if (errno == 0)

errno = EIO;

log_error("Failed to probe: %m");

return -errno;

}

blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL);

if (!streq_ptr(pttype, "gpt")) {

log_error("Image %s does not carry a GUID Partition Table.\n"

"Note that the disk image needs to follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/ to be supported by systemd-nspawn.", arg_image);

return -EINVAL;

}

errno = 0;

pl = blkid_probe_get_partitions(b);

if (!pl) {

if (errno == 0)

return log_oom();

log_error("Failed to list partitions of %s", arg_image);

return -errno;

}

udev = udev_new();

if (!udev)

return log_oom();

if (fstat(fd, &st) < 0) {

log_error("Failed to stat block device: %m");

return -errno;

}

d = udev_device_new_from_devnum(udev, 'b', st.st_rdev);

if (!d)

return log_oom();

e = udev_enumerate_new(udev);

if (!e)

return log_oom();

r = udev_enumerate_add_match_parent(e, d);

if (r < 0)

return log_oom();

r = udev_enumerate_scan_devices(e);

if (r < 0) {

log_error("Failed to scan for partition devices of %s: %s", arg_image, strerror(-r));

return r;

}

first = udev_enumerate_get_list_entry(e);

udev_list_entry_foreach(item, first) {

_cleanup_udev_device_unref_ struct udev_device *q;

const char *stype, *node;

unsigned long long flags;

sd_id128_t type_id;

blkid_partition pp;

dev_t qn;

int nr;

errno = 0;

q = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));

if (!q) {

if (!errno)

errno = ENOMEM;

log_error("Failed to get partition device of %s: %m", arg_image);

return -errno;

}

qn = udev_device_get_devnum(q);

if (major(qn) == 0)

continue;

if (st.st_rdev == qn)

continue;

node = udev_device_get_devnode(q);

if (!node)

continue;

pp = blkid_partlist_devno_to_partition(pl, qn);

if (!pp)

continue;

flags = blkid_partition_get_flags(pp);

if (flags & GPT_FLAG_NO_AUTO)

continue;

nr = blkid_partition_get_partno(pp);

if (nr < 0)

continue;

stype = blkid_partition_get_type_string(pp);

if (!stype)

continue;

if (sd_id128_from_string(stype, &type_id) < 0)

continue;

if (sd_id128_equal(type_id, GPT_HOME)) {

if (home && nr >= home_nr)

continue;

home_nr = nr;

home_rw = !(flags & GPT_FLAG_READ_ONLY);

free(home);

home = strdup(node);

if (!home)

return log_oom();

} else if (sd_id128_equal(type_id, GPT_SRV)) {

if (srv && nr >= srv_nr)

continue;

srv_nr = nr;

srv_rw = !(flags & GPT_FLAG_READ_ONLY);

free(srv);

srv = strdup(node);

if (!srv)

return log_oom();

}

#ifdef GPT_ROOT_NATIVE

else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE)) {

if (root && nr >= root_nr)

continue;

root_nr = nr;

root_rw = !(flags & GPT_FLAG_READ_ONLY);

free(root);

root = strdup(node);

if (!root)

return log_oom();

}

#endif

#ifdef GPT_ROOT_SECONDARY

else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY)) {

if (secondary_root && nr >= secondary_root_nr)

continue;

secondary_root_nr = nr;

secondary_root_rw = !(flags & GPT_FLAG_READ_ONLY);

free(secondary_root);

secondary_root = strdup(node);

if (!secondary_root)

return log_oom();

}

#endif

}

if (!root && !secondary_root) {

log_error("Failed to identify root partition in disk image %s.\n"

"Note that the disk image needs to follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/ to be supported by systemd-nspawn.", arg_image);

return -EINVAL;

}

if (root) {

*root_device = root;

root = NULL;

*root_device_rw = root_rw;

*secondary = false;

} else if (secondary_root) {

*root_device = secondary_root;

secondary_root = NULL;

*root_device_rw = secondary_root_rw;

*secondary = true;

}

if (home) {

*home_device = home;

home = NULL;

*home_device_rw = home_rw;

}

if (srv) {

*srv_device = srv;

srv = NULL;

*srv_device_rw = srv_rw;

}

return 0;

#else

log_error("--image= is not supported, compiled without blkid support.");

return -ENOTSUP;

#endif

}

static int mount_device(const char *what, const char *where, const char *directory, bool rw) {

#ifdef HAVE_BLKID

_cleanup_blkid_free_probe_ blkid_probe b = NULL;

const char *fstype, *p;

int r;

assert(what);

assert(where);

if (arg_read_only)

rw = false;

if (directory)

p = strappenda(where, directory);

else

p = where;

errno = 0;

b = blkid_new_probe_from_filename(what);

if (!b) {

if (errno == 0)

return log_oom();

log_error("Failed to allocate prober for %s: %m", what);

return -errno;

}

blkid_probe_enable_superblocks(b, 1);

blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE);

errno = 0;

r = blkid_do_safeprobe(b);

if (r == -1 || r == 1) {

log_error("Cannot determine file system type of %s", what);

return -EINVAL;

} else if (r != 0) {

if (errno == 0)

errno = EIO;

log_error("Failed to probe %s: %m", what);

return -errno;

}

errno = 0;

if (blkid_probe_lookup_value(b, "TYPE", &fstype, NULL) < 0) {

if (errno == 0)

errno = EINVAL;

log_error("Failed to determine file system type of %s", what);

return -errno;

}

if (streq(fstype, "crypto_LUKS")) {

log_error("nspawn currently does not support LUKS disk images.");

return -ENOTSUP;

}

if (mount(what, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), NULL) < 0) {

log_error("Failed to mount %s: %m", what);

return -errno;

}

return 0;

#else

log_error("--image= is not supported, compiled without blkid support.");

return -ENOTSUP;

#endif

}

static int mount_devices(

const char *where,

const char *root_device, bool root_device_rw,

const char *home_device, bool home_device_rw,

const char *srv_device, bool srv_device_rw) {

int r;

assert(where);

if (root_device) {

r = mount_device(root_device, arg_directory, NULL, root_device_rw);

if (r < 0) {

log_error("Failed to mount root directory: %s", strerror(-r));

return r;

}

}

if (home_device) {

r = mount_device(home_device, arg_directory, "/home", home_device_rw);

if (r < 0) {

log_error("Failed to mount home directory: %s", strerror(-r));

return r;

}

}

if (srv_device) {

r = mount_device(srv_device, arg_directory, "/srv", srv_device_rw);

if (r < 0) {

log_error("Failed to mount server data directory: %s", strerror(-r));

return r;

}

}

return 0;

}

static void loop_remove(int nr, int *image_fd) {

_cleanup_close_ int control = -1;

if (nr < 0)

return;

if (image_fd && *image_fd >= 0) {

ioctl(*image_fd, LOOP_CLR_FD);

*image_fd = safe_close(*image_fd);

}

control = open("/dev/loop-control", O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);

if (control < 0)

return;

ioctl(control, LOOP_CTL_REMOVE, nr);

}

static int spawn_getent(const char *database, const char *key, pid_t *rpid) {

int pipe_fds[2];

pid_t pid;

assert(database);

assert(key);

assert(rpid);

if (pipe2(pipe_fds, O_CLOEXEC) < 0) {

log_error("Failed to allocate pipe: %m");

return -errno;

}

pid = fork();

if (pid < 0) {

log_error("Failed to fork getent child: %m");

return -errno;

} else if (pid == 0) {

int nullfd;

char *empty_env = NULL;

if (dup3(pipe_fds[1], STDOUT_FILENO, 0) < 0)

_exit(EXIT_FAILURE);

if (pipe_fds[0] > 2)

safe_close(pipe_fds[0]);

if (pipe_fds[1] > 2)

safe_close(pipe_fds[1]);

nullfd = open("/dev/null", O_RDWR);

if (nullfd < 0)

_exit(EXIT_FAILURE);

if (dup3(nullfd, STDIN_FILENO, 0) < 0)

_exit(EXIT_FAILURE);

if (dup3(nullfd, STDERR_FILENO, 0) < 0)

_exit(EXIT_FAILURE);

if (nullfd > 2)

safe_close(nullfd);

reset_all_signal_handlers();

close_all_fds(NULL, 0);

execle("/usr/bin/getent", "getent", database, key, NULL, &empty_env);

execle("/bin/getent", "getent", database, key, NULL, &empty_env);

_exit(EXIT_FAILURE);

}

pipe_fds[1] = safe_close(pipe_fds[1]);

*rpid = pid;

return pipe_fds[0];

}

static int change_uid_gid(char **_home) {

char line[LINE_MAX], *w, *x, *state, *u, *g, *h;

_cleanup_free_ uid_t *uids = NULL;

_cleanup_free_ char *home = NULL;

_cleanup_fclose_ FILE *f = NULL;

_cleanup_close_ int fd = -1;

unsigned n_uids = 0;

size_t sz = 0, l;

uid_t uid;

gid_t gid;

pid_t pid;

int r;

assert(_home);

if (!arg_user || streq(arg_user, "root") || streq(arg_user, "0")) {

/* Reset everything fully to 0, just in case */

if (setgroups(0, NULL) < 0) {

log_error("setgroups() failed: %m");

return -errno;

}

if (setresgid(0, 0, 0) < 0) {

log_error("setregid() failed: %m");

return -errno;

}

if (setresuid(0, 0, 0) < 0) {

log_error("setreuid() failed: %m");

return -errno;

}

*_home = NULL;

return 0;

}

/* First, get user credentials */

fd = spawn_getent("passwd", arg_user, &pid);

if (fd < 0)

return fd;

f = fdopen(fd, "r");

if (!f)

return log_oom();

fd = -1;

if (!fgets(line, sizeof(line), f)) {

if (!ferror(f)) {

log_error("Failed to resolve user %s.", arg_user);

return -ESRCH;

}

log_error("Failed to read from getent: %m");

return -errno;

}

truncate_nl(line);

wait_for_terminate_and_warn("getent passwd", pid);

x = strchr(line, ':');

if (!x) {

log_error("/etc/passwd entry has invalid user field.");

return -EIO;

}

u = strchr(x+1, ':');

if (!u) {

log_error("/etc/passwd entry has invalid password field.");

return -EIO;

}

u++;

g = strchr(u, ':');

if (!g) {

log_error("/etc/passwd entry has invalid UID field.");

return -EIO;

}

*g = 0;

g++;

x = strchr(g, ':');

if (!x) {

log_error("/etc/passwd entry has invalid GID field.");

return -EIO;

}

*x = 0;

h = strchr(x+1, ':');

if (!h) {

log_error("/etc/passwd entry has invalid GECOS field.");

return -EIO;

}

h++;

x = strchr(h, ':');

if (!x) {

log_error("/etc/passwd entry has invalid home directory field.");

return -EIO;

}

*x = 0;

r = parse_uid(u, &uid);

if (r < 0) {

log_error("Failed to parse UID of user.");

return -EIO;

}

r = parse_gid(g, &gid);

if (r < 0) {

log_error("Failed to parse GID of user.");

return -EIO;

}

home = strdup(h);

if (!home)

return log_oom();

/* Second, get group memberships */

fd = spawn_getent("initgroups", arg_user, &pid);

if (fd < 0)

return fd;

fclose(f);

f = fdopen(fd, "r");

if (!f)

return log_oom();

fd = -1;

if (!fgets(line, sizeof(line), f)) {

if (!ferror(f)) {

log_error("Failed to resolve user %s.", arg_user);

return -ESRCH;

}

log_error("Failed to read from getent: %m");

return -errno;

}

truncate_nl(line);

wait_for_terminate_and_warn("getent initgroups", pid);

/* Skip over the username and subsequent separator whitespace */

x = line;

x += strcspn(x, WHITESPACE);

x += strspn(x, WHITESPACE);

FOREACH_WORD(w, l, x, state) {

char c[l+1];

memcpy(c, w, l);

c[l] = 0;

if (!GREEDY_REALLOC(uids, sz, n_uids+1))

return log_oom();

r = parse_uid(c, &uids[n_uids++]);

if (r < 0) {

log_error("Failed to parse group data from getent.");

return -EIO;

}

}

r = mkdir_parents(home, 0775);

if (r < 0) {

log_error("Failed to make home root directory: %s", strerror(-r));

return r;

}

r = mkdir_safe(home, 0755, uid, gid);

if (r < 0 && r != -EEXIST) {

log_error("Failed to make home directory: %s", strerror(-r));

return r;

}

fchown(STDIN_FILENO, uid, gid);

fchown(STDOUT_FILENO, uid, gid);

fchown(STDERR_FILENO, uid, gid);

if (setgroups(n_uids, uids) < 0) {

log_error("Failed to set auxiliary groups: %m");

return -errno;

}

if (setresgid(gid, gid, gid) < 0) {

log_error("setregid() failed: %m");

return -errno;

}

if (setresuid(uid, uid, uid) < 0) {

log_error("setreuid() failed: %m");

return -errno;

}

if (_home) {

*_home = home;

home = NULL;

}

return 0;

}

static int wait_for_container(pid_t pid, ContainerStatus *container) {

int r;

siginfo_t status;

r = wait_for_terminate(pid, &status);

if (r < 0)

return r;

switch (status.si_code) {

case CLD_EXITED:

r = status.si_status;

if (r == 0) {

if (!arg_quiet)

log_debug("Container %s exited successfully.",

arg_machine);

*container = CONTAINER_TERMINATED;

} else {

log_error("Container %s failed with error code %i.",

arg_machine, status.si_status);

r = -1;

}

break;

case CLD_KILLED:

if (status.si_status == SIGINT) {

if (!arg_quiet)

log_info("Container %s has been shut down.",

arg_machine);

*container = CONTAINER_TERMINATED;

r = 0;

break;

} else if (status.si_status == SIGHUP) {

if (!arg_quiet)

log_info("Container %s is being rebooted.",

arg_machine);

*container = CONTAINER_REBOOTED;

r = 0;

break;

}

/* CLD_KILLED fallthrough */

case CLD_DUMPED:

log_error("Container %s terminated by signal %s.",

arg_machine, signal_to_string(status.si_status));

r = -1;

break;

default:

log_error("Container %s failed due to unknown reason.",

arg_machine);

r = -1;

break;

}

return r;

}

static void nop_handler(int sig) {}

int main(int argc, char *argv[]) {

_cleanup_free_ char *kdbus_domain = NULL, *device_path = NULL, *root_device = NULL, *home_device = NULL, *srv_device = NULL;

bool root_device_rw = true, home_device_rw = true, srv_device_rw = true;

_cleanup_close_ int master = -1, kdbus_fd = -1, image_fd = -1;

_cleanup_close_pair_ int kmsg_socket_pair[2] = { -1, -1 };

_cleanup_fdset_free_ FDSet *fds = NULL;

int r = EXIT_FAILURE, k, n_fd_passed, loop_nr = -1;

const char *console = NULL;

char veth_name[IFNAMSIZ];

bool secondary = false;

sigset_t mask, mask_chld;

pid_t pid = 0;

log_parse_environment();

log_open();

k = parse_argv(argc, argv);

if (k < 0)

goto finish;

else if (k == 0) {

r = EXIT_SUCCESS;

goto finish;

}

if (!arg_image) {

if (arg_directory) {

char *p;

p = path_make_absolute_cwd(arg_directory);

free(arg_directory);

arg_directory = p;

} else

arg_directory = get_current_dir_name();

if (!arg_directory) {

log_error("Failed to determine path, please use -D.");

goto finish;

}

path_kill_slashes(arg_directory);

}

if (!arg_machine) {

arg_machine = strdup(basename(arg_image ? arg_image : arg_directory));

if (!arg_machine) {

log_oom();

goto finish;

}

hostname_cleanup(arg_machine, false);

if (isempty(arg_machine)) {

log_error("Failed to determine machine name automatically, please use -M.");

goto finish;

}

}

if (geteuid() != 0) {

log_error("Need to be root.");

goto finish;

}

if (sd_booted() <= 0) {

log_error("Not running on a systemd system.");

goto finish;

}

log_close();

n_fd_passed = sd_listen_fds(false);

if (n_fd_passed > 0) {

k = fdset_new_listen_fds(&fds, false);

if (k < 0) {

log_error("Failed to collect file descriptors: %s", strerror(-k));

goto finish;

}

}

fdset_close_others(fds);

log_open();

if (arg_directory) {

if (path_equal(arg_directory, "/")) {

log_error("Spawning container on root directory not supported.");

goto finish;

}

if (arg_boot) {

if (path_is_os_tree(arg_directory) <= 0) {

log_error("Directory %s doesn't look like an OS root directory (/etc/os-release is missing). Refusing.", arg_directory);

goto finish;

}

} else {

const char *p;

p = strappenda(arg_directory,

argc > optind && path_is_absolute(argv[optind]) ? argv[optind] : "/usr/bin/");

if (access(p, F_OK) < 0) {

log_error("Directory %s lacks the binary to execute or doesn't look like a binary tree. Refusing.", arg_directory);

goto finish;

}

}

} else {

char template[] = "/tmp/nspawn-root-XXXXXX";

if (!mkdtemp(template)) {

log_error("Failed to create temporary directory: %m");

r = -errno;

goto finish;

}

arg_directory = strdup(template);

if (!arg_directory) {

r = log_oom();

goto finish;

}

image_fd = setup_image(&device_path, &loop_nr);

if (image_fd < 0) {

r = image_fd;

goto finish;

}

r = dissect_image(image_fd, &root_device, &root_device_rw, &home_device, &home_device_rw, &srv_device, &srv_device_rw, &secondary);

if (r < 0)

goto finish;

}

master = posix_openpt(O_RDWR|O_NOCTTY|O_CLOEXEC|O_NDELAY);

if (master < 0) {

log_error("Failed to acquire pseudo tty: %m");

goto finish;

}

console = ptsname(master);

if (!console) {

log_error("Failed to determine tty name: %m");

goto finish;

}

if (!arg_quiet)

log_info("Spawning container %s on %s.\nPress ^] three times within 1s to kill container.",

arg_machine, arg_image ? arg_image : arg_directory);

if (unlockpt(master) < 0) {

log_error("Failed to unlock tty: %m");

goto finish;

}

if (access("/dev/kdbus/control", F_OK) >= 0) {

if (arg_share_system) {

kdbus_domain = strdup("/dev/kdbus");

if (!kdbus_domain) {

log_oom();

goto finish;

}

} else {

const char *ns;

ns = strappenda("machine-", arg_machine);

kdbus_fd = bus_kernel_create_domain(ns, &kdbus_domain);

if (r < 0)

log_debug("Failed to create kdbus domain: %s", strerror(-r));

else

log_debug("Successfully created kdbus domain as %s", kdbus_domain);

}

}

if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0, kmsg_socket_pair) < 0) {

log_error("Failed to create kmsg socket pair: %m");

goto finish;

}

sd_notify(0, "READY=1");

assert_se(sigemptyset(&mask) == 0);

assert_se(sigemptyset(&mask_chld) == 0);

sigaddset(&mask_chld, SIGCHLD);

sigset_add_many(&mask, SIGCHLD, SIGWINCH, SIGTERM, SIGINT, -1);

assert_se(sigprocmask(SIG_BLOCK, &mask, NULL) == 0);

for (;;) {

ContainerStatus container_status;

int eventfds[2] = { -1, -1 };

struct sigaction sa = {

.sa_handler = nop_handler,

.sa_flags = SA_NOCLDSTOP,

};

/* Child can be killed before execv(), so handle SIGCHLD

r = sigprocmask(SIG_UNBLOCK, &mask_chld, NULL);

if (r < 0) {

log_error("Failed to change the signal mask: %m");

goto finish;

}

r = sigaction(SIGCHLD, &sa, NULL);

if (r < 0) {

log_error("Failed to install SIGCHLD handler: %m");

goto finish;

}

pid = clone_with_eventfd(SIGCHLD|CLONE_NEWNS|

(arg_share_system ? 0 : CLONE_NEWIPC|CLONE_NEWPID|CLONE_NEWUTS)|

(arg_private_network ? CLONE_NEWNET : 0), eventfds);

if (pid < 0) {

if (errno == EINVAL)

log_error("clone() failed, do you have namespace support enabled in your kernel? (You need UTS, IPC, PID and NET namespacing built in): %m");

else

log_error("clone() failed: %m");

r = pid;

goto finish;

}

if (pid == 0) {

/* child */

_cleanup_free_ char *home = NULL;

unsigned n_env = 2;

const char *envp[] = {

"PATH=" DEFAULT_PATH_SPLIT_USR,

"container=systemd-nspawn", /* LXC sets container=lxc, so follow the scheme here */

NULL, /* TERM */

NULL, /* HOME */

NULL, /* USER */

NULL, /* LOGNAME */

NULL, /* container_uuid */

NULL, /* LISTEN_FDS */

NULL, /* LISTEN_PID */

NULL

};

char **env_use;

envp[n_env] = strv_find_prefix(environ, "TERM=");

if (envp[n_env])

n_env ++;

master = safe_close(master);

close_nointr(STDIN_FILENO);

close_nointr(STDOUT_FILENO);

close_nointr(STDERR_FILENO);

kmsg_socket_pair[0] = safe_close(kmsg_socket_pair[0]);

reset_all_signal_handlers();

assert_se(sigemptyset(&mask) == 0);

assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);

k = open_terminal(console, O_RDWR);

if (k != STDIN_FILENO) {

if (k >= 0) {