-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <signal.h>
-#include <sched.h>
-#include <unistd.h>
-#include <sys/types.h>
-#include <sys/mount.h>
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-#include <errno.h>
-#include <sys/prctl.h>
-#include <getopt.h>
-#include <grp.h>
-#include <linux/fs.h>
-#include <sys/socket.h>
-#include <linux/netlink.h>
-#include <net/if.h>
-#include <linux/veth.h>
-#include <sys/personality.h>
-#include <linux/loop.h>
-#include <sys/file.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 "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 "env-util.h"
-#include "rtnl-util.h"
-#include "udev-util.h"
-#include "blkid-util.h"
-#include "gpt.h"
-#include "siphash24.h"
-#include "copy.h"
-#include "base-filesystem.h"
-#include "barrier.h"
-#include "event-util.h"
-#include "capability.h"
-#include "cap-list.h"
-#include "btrfs-util.h"
-#include "machine-image.h"
-#include "list.h"
-#include "in-addr-util.h"
-#include "fw-util.h"
-#include "local-addresses.h"
-
-#ifdef HAVE_SECCOMP
-#include "seccomp-util.h"
-#endif
-
-typedef struct ExposePort {
- int protocol;
- uint16_t host_port;
- uint16_t container_port;
- LIST_FIELDS(struct ExposePort, ports);
-} ExposePort;
-
-typedef enum ContainerStatus {
- CONTAINER_TERMINATED,
- CONTAINER_REBOOTED
-} ContainerStatus;
-
-typedef enum LinkJournal {
- LINK_NO,
- LINK_AUTO,
- LINK_HOST,
- LINK_GUEST
-} LinkJournal;
-
-typedef enum Volatile {
- VOLATILE_NO,
- VOLATILE_YES,
- VOLATILE_STATE,
-} Volatile;
-
-static char *arg_directory = NULL;
-static char *arg_template = 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 bool arg_ephemeral = false;
-static LinkJournal arg_link_journal = LINK_AUTO;
-static bool arg_link_journal_try = false;
-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_tmpfs = 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 char **arg_network_ipvlan = NULL;
-static bool arg_network_veth = false;
-static const char *arg_network_bridge = NULL;
-static unsigned long arg_personality = 0xffffffffLU;
-static char *arg_image = NULL;
-static Volatile arg_volatile = VOLATILE_NO;
-static ExposePort *arg_expose_ports = NULL;
-static char **arg_property = NULL;
-static uid_t arg_uid_shift = UID_INVALID, arg_uid_range = 0x10000U;
-static bool arg_userns = false;
-static int arg_kill_signal = 0;
-
-static void 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"
- " --template=PATH Initialize root directory from template directory,\n"
- " if missing\n"
- " -x --ephemeral Run container with snapshot of root directory, and\n"
- " remove it after exit\n"
- " -i --image=PATH File system device or disk 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"
- " --property=NAME=VALUE Set scope unit property\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-ipvlan=INTERFACE\n"
- " Create a ipvlan network interface based on an\n"
- " existing network interface to the container\n"
- " -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"
- " --private-users[=UIDBASE[:NUIDS]]\n"
- " Run within user namespace\n"
- " -p --port=[PROTOCOL:]HOSTPORT[:CONTAINERPORT]\n"
- " Expose a container IP port on 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"
- " --kill-signal=SIGNAL Select signal to use for shutting down PID 1\n"
- " --link-journal=MODE Link up guest journal, one of no, auto, guest, host,\n"
- " try-guest, try-host\n"
- " -j Equivalent to --link-journal=try-guest\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"
- " --tmpfs=PATH:[OPTIONS] Mount an empty tmpfs to the specified directory\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"
- " --volatile[=MODE] Run the system in volatile mode\n"
- , program_invocation_short_name);
-}
-
-static int set_sanitized_path(char **b, const char *path) {
- char *p;
-
- assert(b);
- assert(path);
-
- p = canonicalize_file_name(path);
- if (!p) {
- if (errno != ENOENT)
- return -errno;
-
- p = path_make_absolute_cwd(path);
- if (!p)
- return -ENOMEM;
- }
-
- free(*b);
- *b = path_kill_slashes(p);
- 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_TMPFS,
- ARG_SETENV,
- ARG_SHARE_SYSTEM,
- ARG_REGISTER,
- ARG_KEEP_UNIT,
- ARG_NETWORK_INTERFACE,
- ARG_NETWORK_MACVLAN,
- ARG_NETWORK_IPVLAN,
- ARG_NETWORK_BRIDGE,
- ARG_PERSONALITY,
- ARG_VOLATILE,
- ARG_TEMPLATE,
- ARG_PROPERTY,
- ARG_PRIVATE_USERS,
- ARG_KILL_SIGNAL,
- };
-
- static const struct option options[] = {
- { "help", no_argument, NULL, 'h' },
- { "version", no_argument, NULL, ARG_VERSION },
- { "directory", required_argument, NULL, 'D' },
- { "template", required_argument, NULL, ARG_TEMPLATE },
- { "ephemeral", no_argument, NULL, 'x' },
- { "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 },
- { "tmpfs", required_argument, NULL, ARG_TMPFS },
- { "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-ipvlan", required_argument, NULL, ARG_NETWORK_IPVLAN },
- { "network-veth", no_argument, NULL, 'n' },
- { "network-bridge", required_argument, NULL, ARG_NETWORK_BRIDGE },
- { "personality", required_argument, NULL, ARG_PERSONALITY },
- { "image", required_argument, NULL, 'i' },
- { "volatile", optional_argument, NULL, ARG_VOLATILE },
- { "port", required_argument, NULL, 'p' },
- { "property", required_argument, NULL, ARG_PROPERTY },
- { "private-users", optional_argument, NULL, ARG_PRIVATE_USERS },
- { "kill-signal", required_argument, NULL, ARG_KILL_SIGNAL },
- {}
- };
-
- 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:xp:n", options, NULL)) >= 0)
-
- switch (c) {
-
- case 'h':
- help();
- return 0;
-
- case ARG_VERSION:
- puts(PACKAGE_STRING);
- puts(SYSTEMD_FEATURES);
- return 0;
-
- case 'D':
- r = set_sanitized_path(&arg_directory, optarg);
- if (r < 0)
- return log_error_errno(r, "Invalid root directory: %m");
-
- break;
-
- case ARG_TEMPLATE:
- r = set_sanitized_path(&arg_template, optarg);
- if (r < 0)
- return log_error_errno(r, "Invalid template directory: %m");
-
- break;
-
- case 'i':
- r = set_sanitized_path(&arg_image, optarg);
- if (r < 0)
- return log_error_errno(r, "Invalid image path: %m");
-
- break;
-
- case 'x':
- arg_ephemeral = true;
- 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 'n':
- 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();
-
- arg_private_network = true;
- break;
-
- case ARG_NETWORK_IPVLAN:
- if (strv_extend(&arg_network_ipvlan, 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 (!machine_name_is_valid(optarg)) {
- log_error("Invalid machine name: %s", optarg);
- return -EINVAL;
- }
-
- r = free_and_strdup(&arg_machine, optarg);
- if (r < 0)
- 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: {
- const char *state, *word;
- size_t length;
-
- FOREACH_WORD_SEPARATOR(word, length, optarg, ",", state) {
- _cleanup_free_ char *t;
-
- 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 {
- int cap;
-
- cap = capability_from_name(t);
- if (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;
- arg_link_journal_try = true;
- break;
-
- case ARG_LINK_JOURNAL:
- if (streq(optarg, "auto")) {
- arg_link_journal = LINK_AUTO;
- arg_link_journal_try = false;
- } else if (streq(optarg, "no")) {
- arg_link_journal = LINK_NO;
- arg_link_journal_try = false;
- } else if (streq(optarg, "guest")) {
- arg_link_journal = LINK_GUEST;
- arg_link_journal_try = false;
- } else if (streq(optarg, "host")) {
- arg_link_journal = LINK_HOST;
- arg_link_journal_try = false;
- } else if (streq(optarg, "try-guest")) {
- arg_link_journal = LINK_GUEST;
- arg_link_journal_try = true;
- } else if (streq(optarg, "try-host")) {
- arg_link_journal = LINK_HOST;
- arg_link_journal_try = true;
- } 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_TMPFS: {
- _cleanup_free_ char *a = NULL, *b = NULL;
- char *e;
-
- e = strchr(optarg, ':');
- if (e) {
- a = strndup(optarg, e - optarg);
- b = strdup(e + 1);
- } else {
- a = strdup(optarg);
- b = strdup("mode=0755");
- }
-
- if (!a || !b)
- return log_oom();
-
- if (!path_is_absolute(a)) {
- log_error("Invalid tmpfs specification: %s", optarg);
- return -EINVAL;
- }
-
- r = strv_push(&arg_tmpfs, a);
- if (r < 0)
- return log_oom();
-
- a = NULL;
-
- r = strv_push(&arg_tmpfs, b);
- if (r < 0)
- return log_oom();
-
- b = NULL;
-
- 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 ARG_VOLATILE:
-
- if (!optarg)
- arg_volatile = VOLATILE_YES;
- else {
- r = parse_boolean(optarg);
- if (r < 0) {
- if (streq(optarg, "state"))
- arg_volatile = VOLATILE_STATE;
- else {
- log_error("Failed to parse --volatile= argument: %s", optarg);
- return r;
- }
- } else
- arg_volatile = r ? VOLATILE_YES : VOLATILE_NO;
- }
-
- break;
-
- case 'p': {
- const char *split, *e;
- uint16_t container_port, host_port;
- int protocol;
- ExposePort *p;
-
- if ((e = startswith(optarg, "tcp:")))
- protocol = IPPROTO_TCP;
- else if ((e = startswith(optarg, "udp:")))
- protocol = IPPROTO_UDP;
- else {
- e = optarg;
- protocol = IPPROTO_TCP;
- }
-
- split = strchr(e, ':');
- if (split) {
- char v[split - e + 1];
-
- memcpy(v, e, split - e);
- v[split - e] = 0;
-
- r = safe_atou16(v, &host_port);
- if (r < 0 || host_port <= 0) {
- log_error("Failed to parse host port: %s", optarg);
- return -EINVAL;
- }
-
- r = safe_atou16(split + 1, &container_port);
- } else {
- r = safe_atou16(e, &container_port);
- host_port = container_port;
- }
-
- if (r < 0 || container_port <= 0) {
- log_error("Failed to parse host port: %s", optarg);
- return -EINVAL;
- }
-
- LIST_FOREACH(ports, p, arg_expose_ports) {
- if (p->protocol == protocol && p->host_port == host_port) {
- log_error("Duplicate port specification: %s", optarg);
- return -EINVAL;
- }
- }
-
- p = new(ExposePort, 1);
- if (!p)
- return log_oom();
-
- p->protocol = protocol;
- p->host_port = host_port;
- p->container_port = container_port;
-
- LIST_PREPEND(ports, arg_expose_ports, p);
-
- break;
- }
-
- case ARG_PROPERTY:
- if (strv_extend(&arg_property, optarg) < 0)
- return log_oom();
-
- break;
-
- case ARG_PRIVATE_USERS:
- if (optarg) {
- _cleanup_free_ char *buffer = NULL;
- const char *range, *shift;
-
- range = strchr(optarg, ':');
- if (range) {
- buffer = strndup(optarg, range - optarg);
- if (!buffer)
- return log_oom();
- shift = buffer;
-
- range++;
- if (safe_atou32(range, &arg_uid_range) < 0 || arg_uid_range <= 0) {
- log_error("Failed to parse UID range: %s", range);
- return -EINVAL;
- }
- } else
- shift = optarg;
-
- if (parse_uid(shift, &arg_uid_shift) < 0) {
- log_error("Failed to parse UID: %s", optarg);
- return -EINVAL;
- }
- }
-
- arg_userns = true;
- break;
-
- case ARG_KILL_SIGNAL:
- arg_kill_signal = signal_from_string_try_harder(optarg);
- if (arg_kill_signal < 0) {
- log_error("Cannot parse signal: %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;
- }
-
- if (arg_template && arg_image) {
- log_error("--template= and --image= may not be combined.");
- return -EINVAL;
- }
-
- if (arg_template && !(arg_directory || arg_machine)) {
- log_error("--template= needs --directory= or --machine=.");
- return -EINVAL;
- }
-
- if (arg_ephemeral && arg_template) {
- log_error("--ephemeral and --template= may not be combined.");
- return -EINVAL;
- }
-
- if (arg_ephemeral && arg_image) {
- log_error("--ephemeral and --image= may not be combined.");
- return -EINVAL;
- }
-
- if (arg_ephemeral && !IN_SET(arg_link_journal, LINK_NO, LINK_AUTO)) {
- log_error("--ephemeral and --link-journal= may not be combined.");
- return -EINVAL;
- }
-
- if (arg_volatile != VOLATILE_NO && arg_read_only) {
- log_error("Cannot combine --read-only with --volatile. Note that --volatile already implies a read-only base hierarchy.");
- return -EINVAL;
- }
-
- if (arg_expose_ports && !arg_private_network) {
- log_error("Cannot use --port= without private networking.");
- return -EINVAL;
- }
-
- arg_retain = (arg_retain | plus | (arg_private_network ? 1ULL << CAP_NET_ADMIN : 0)) & ~minus;
-
- if (arg_boot && arg_kill_signal <= 0)
- arg_kill_signal = SIGRTMIN+3;
-
- 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 },
- { "tmpfs", "/tmp", "tmpfs", "mode=1777", 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, *options = NULL;
- 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_errno(t, "Failed to detect whether %s is a mount point: %m", where);
-
- if (r == 0)
- r = t;
-
- continue;
- }
-
- /* Skip this entry if it is not a remount. */
- if (mount_table[k].what && t > 0)
- continue;
-
- t = mkdir_p(where, 0755);
- if (t < 0) {
- if (mount_table[k].fatal) {
- log_error_errno(t, "Failed to create directory %s: %m", where);
-
- if (r == 0)
- r = t;
- } else
- log_warning_errno(t, "Failed to create directory %s: %m", where);
-
- continue;
- }
-
-#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 (arg_userns && arg_uid_shift != UID_INVALID && streq_ptr(mount_table[k].type, "tmpfs")) {
- char *uid_options = NULL;
-
- if (o)
- asprintf(&uid_options, "%s,uid=" UID_FMT ",gid=" UID_FMT, o, arg_uid_shift, arg_uid_shift);
- else
- asprintf(&uid_options, "uid=" UID_FMT ",gid=" UID_FMT, arg_uid_shift, arg_uid_shift);
- if (!uid_options)
- return log_oom();
-
- free(options);
- o = options = uid_options;
- }
-
- if (mount(mount_table[k].what,
- where,
- mount_table[k].type,
- mount_table[k].flags,
- o) < 0) {
-
- if (mount_table[k].fatal) {
- log_error_errno(errno, "mount(%s) failed: %m", where);
-
- if (r == 0)
- r = -errno;
- } else
- log_warning_errno(errno, "mount(%s) failed: %m", where);
- }
- }
-
- return r;
-}
-
-static int mount_binds(const char *dest, char **l, bool ro) {
- char **x, **y;
-
- STRV_FOREACH_PAIR(x, y, l) {
- _cleanup_free_ char *where = NULL;
- struct stat source_st, dest_st;
- int r;
-
- if (stat(*x, &source_st) < 0)
- return log_error_errno(errno, "Failed to stat %s: %m", *x);
-
- where = strappend(dest, *y);
- if (!where)
- return log_oom();
-
- r = stat(where, &dest_st);
- if (r == 0) {
- if (S_ISDIR(source_st.st_mode) && !S_ISDIR(dest_st.st_mode)) {
- log_error("Cannot bind mount directory %s on file %s.", *x, where);
- return -EINVAL;
- }
- if (!S_ISDIR(source_st.st_mode) && S_ISDIR(dest_st.st_mode)) {
- log_error("Cannot bind mount file %s on directory %s.", *x, where);
- return -EINVAL;
- }
- } else if (errno == ENOENT) {
- r = mkdir_parents_label(where, 0755);
- if (r < 0)
- return log_error_errno(r, "Failed to bind mount %s: %m", *x);
- } else {
- log_error_errno(errno, "Failed to bind mount %s: %m", *x);
- return -errno;
- }
-
- /* Create the mount point. Any non-directory file can be
- * mounted on any non-directory file (regular, fifo, socket,
- * char, block).
- */
- if (S_ISDIR(source_st.st_mode)) {
- r = mkdir_label(where, 0755);
- if (r < 0 && errno != EEXIST)
- return log_error_errno(r, "Failed to create mount point %s: %m", where);
- } else {
- r = touch(where);
- if (r < 0)
- return log_error_errno(r, "Failed to create mount point %s: %m", where);
- }
-
- if (mount(*x, where, NULL, MS_BIND, NULL) < 0)
- return log_error_errno(errno, "mount(%s) failed: %m", where);
-
- if (ro) {
- r = bind_remount_recursive(where, true);
- if (r < 0)
- return log_error_errno(r, "Read-Only bind mount failed: %m");
- }
- }
-
- return 0;
-}
-
-static int mount_cgroup_hierarchy(const char *dest, const char *controller, const char *hierarchy, bool read_only) {
- char *to;
- int r;
-
- to = strjoina(dest, "/sys/fs/cgroup/", hierarchy);
-
- r = path_is_mount_point(to, false);
- if (r < 0)
- return log_error_errno(r, "Failed to determine if %s is mounted already: %m", to);
- if (r > 0)
- return 0;
-
- mkdir_p(to, 0755);
-
- /* The superblock mount options of the mount point need to be
- * identical to the hosts', and hence writable... */
- if (mount("cgroup", to, "cgroup", MS_NOSUID|MS_NOEXEC|MS_NODEV, controller) < 0)
- return log_error_errno(errno, "Failed to mount to %s: %m", to);
-
- /* ... hence let's only make the bind mount read-only, not the
- * superblock. */
- if (read_only) {
- if (mount(NULL, to, NULL, MS_BIND|MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, NULL) < 0)
- return log_error_errno(errno, "Failed to remount %s read-only: %m", to);
- }
- return 1;
-}
-
-static int mount_cgroup(const char *dest) {
- _cleanup_set_free_free_ Set *controllers = NULL;
- _cleanup_free_ char *own_cgroup_path = NULL;
- const char *cgroup_root, *systemd_root, *systemd_own;
- int r;
-
- controllers = set_new(&string_hash_ops);
- if (!controllers)
- return log_oom();
-
- r = cg_kernel_controllers(controllers);
- if (r < 0)
- return log_error_errno(r, "Failed to determine cgroup controllers: %m");
-
- r = cg_pid_get_path(NULL, 0, &own_cgroup_path);
- if (r < 0)
- return log_error_errno(r, "Failed to determine our own cgroup path: %m");
-
- cgroup_root = strjoina(dest, "/sys/fs/cgroup");
- if (mount("tmpfs", cgroup_root, "tmpfs", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, "mode=755") < 0)
- return log_error_errno(errno, "Failed to mount tmpfs to /sys/fs/cgroup: %m");
-
- for (;;) {
- _cleanup_free_ char *controller = NULL, *origin = NULL, *combined = NULL;
-
- controller = set_steal_first(controllers);
- if (!controller)
- break;
-
- origin = strappend("/sys/fs/cgroup/", controller);
- if (!origin)
- return log_oom();
-
- r = readlink_malloc(origin, &combined);
- if (r == -EINVAL) {
- /* Not a symbolic link, but directly a single cgroup hierarchy */
-
- r = mount_cgroup_hierarchy(dest, controller, controller, true);
- if (r < 0)
- return r;
-
- } else if (r < 0)
- return log_error_errno(r, "Failed to read link %s: %m", origin);
- else {
- _cleanup_free_ char *target = NULL;
-
- target = strjoin(dest, "/sys/fs/cgroup/", controller, NULL);
- if (!target)
- return log_oom();
-
- /* A symbolic link, a combination of controllers in one hierarchy */
-
- if (!filename_is_valid(combined)) {
- log_warning("Ignoring invalid combined hierarchy %s.", combined);
- continue;
- }
-
- r = mount_cgroup_hierarchy(dest, combined, combined, true);
- if (r < 0)
- return r;
-
- if (symlink(combined, target) < 0)
- return log_error_errno(errno, "Failed to create symlink for combined hierarchy: %m");
- }
- }
-
- r = mount_cgroup_hierarchy(dest, "name=systemd,xattr", "systemd", false);
- if (r < 0)
- return r;
-
- /* Make our own cgroup a (writable) bind mount */
- systemd_own = strjoina(dest, "/sys/fs/cgroup/systemd", own_cgroup_path);
- if (mount(systemd_own, systemd_own, NULL, MS_BIND, NULL) < 0)
- return log_error_errno(errno, "Failed to turn %s into a bind mount: %m", own_cgroup_path);
-
- /* And then remount the systemd cgroup root read-only */
- systemd_root = strjoina(dest, "/sys/fs/cgroup/systemd");
- if (mount(NULL, systemd_root, NULL, MS_BIND|MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, NULL) < 0)
- return log_error_errno(errno, "Failed to mount cgroup root read-only: %m");
-
- if (mount(NULL, cgroup_root, NULL, MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME|MS_RDONLY, "mode=755") < 0)
- return log_error_errno(errno, "Failed to remount %s read-only: %m", cgroup_root);
-
- return 0;
-}
-
-static int mount_tmpfs(const char *dest) {
- char **i, **o;
-
- STRV_FOREACH_PAIR(i, o, arg_tmpfs) {
- _cleanup_free_ char *where = NULL;
- int r;
-
- where = strappend(dest, *i);
- if (!where)
- return log_oom();
-
- r = mkdir_label(where, 0755);
- if (r < 0 && r != -EEXIST)
- return log_error_errno(r, "Creating mount point for tmpfs %s failed: %m", where);
-
- if (mount("tmpfs", where, "tmpfs", MS_NODEV|MS_STRICTATIME, *o) < 0)
- return log_error_errno(errno, "tmpfs mount to %s failed: %m", where);
- }
-
- 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();
-
- r = mkdir_parents(where, 0755);
- if (r < 0) {
- log_error_errno(r, "Failed to create directory for timezone info %s in container: %m", where);
-
- return 0;
- }
-
- r = unlink(where);
- if (r < 0 && errno != ENOENT) {
- log_error_errno(errno, "Failed to remove existing timezone info %s in container: %m", where);
-
- return 0;
- }
-
- if (symlink(what, where) < 0) {
- log_error_errno(errno, "Failed to correct timezone of container: %m");
- return 0;
- }
-
- return 0;
-}
-
-static int setup_resolv_conf(const char *dest) {
- _cleanup_free_ char *where = NULL;
- int r;
-
- 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
- * fails, it fails, but meh... */
- r = mkdir_parents(where, 0755);
- if (r < 0) {
- log_warning_errno(r, "Failed to create parent directory for resolv.conf %s: %m", where);
-
- return 0;
- }
-
- r = copy_file("/etc/resolv.conf", where, O_TRUNC|O_NOFOLLOW, 0644, 0);
- if (r < 0) {
- log_warning_errno(r, "Failed to copy /etc/resolv.conf to %s: %m", where);
-
- return 0;
- }
-
- return 0;
-}
-
-static int setup_volatile_state(const char *directory) {
- const char *p;
- int r;
-
- assert(directory);
-
- if (arg_volatile != VOLATILE_STATE)
- return 0;
-
- /* --volatile=state means we simply overmount /var
- with a tmpfs, and the rest read-only. */
-
- r = bind_remount_recursive(directory, true);
- if (r < 0)
- return log_error_errno(r, "Failed to remount %s read-only: %m", directory);
-
- p = strjoina(directory, "/var");
- r = mkdir(p, 0755);
- if (r < 0 && errno != EEXIST)
- return log_error_errno(errno, "Failed to create %s: %m", directory);
-
- if (mount("tmpfs", p, "tmpfs", MS_STRICTATIME, "mode=755") < 0)
- return log_error_errno(errno, "Failed to mount tmpfs to /var: %m");
-
- return 0;
-}
-
-static int setup_volatile(const char *directory) {
- bool tmpfs_mounted = false, bind_mounted = false;
- char template[] = "/tmp/nspawn-volatile-XXXXXX";
- const char *f, *t;
- int r;
-
- assert(directory);
-
- if (arg_volatile != VOLATILE_YES)
- return 0;
-
- /* --volatile=yes means we mount a tmpfs to the root dir, and
- the original /usr to use inside it, and that read-only. */
-
- if (!mkdtemp(template))
- return log_error_errno(errno, "Failed to create temporary directory: %m");
-
- if (mount("tmpfs", template, "tmpfs", MS_STRICTATIME, "mode=755") < 0) {
- log_error_errno(errno, "Failed to mount tmpfs for root directory: %m");
- r = -errno;
- goto fail;
- }
-
- tmpfs_mounted = true;
-
- f = strjoina(directory, "/usr");
- t = strjoina(template, "/usr");
-
- r = mkdir(t, 0755);
- if (r < 0 && errno != EEXIST) {
- log_error_errno(errno, "Failed to create %s: %m", t);
- r = -errno;
- goto fail;
- }
-
- if (mount(f, t, NULL, MS_BIND|MS_REC, NULL) < 0) {
- log_error_errno(errno, "Failed to create /usr bind mount: %m");
- r = -errno;
- goto fail;
- }
-
- bind_mounted = true;
-
- r = bind_remount_recursive(t, true);
- if (r < 0) {
- log_error_errno(r, "Failed to remount %s read-only: %m", t);
- goto fail;
- }
-
- if (mount(template, directory, NULL, MS_MOVE, NULL) < 0) {
- log_error_errno(errno, "Failed to move root mount: %m");
- r = -errno;
- goto fail;
- }
-
- rmdir(template);
-
- return 0;
-
-fail:
- if (bind_mounted)
- umount(t);
- if (tmpfs_mounted)
- umount(template);
- rmdir(template);
- return r;
-}
-
-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
- * the container gets a new one */
-
- 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)
- return log_error_errno(r, "Failed to generate random boot id: %m");
-
- id128_format_as_uuid(rnd, as_uuid);
-
- r = write_string_file(from, as_uuid);
- if (r < 0)
- return log_error_errno(r, "Failed to write boot id: %m");
-
- if (mount(from, to, NULL, MS_BIND, NULL) < 0) {
- log_error_errno(errno, "Failed to bind mount boot id: %m");
- r = -errno;
- } else if (mount(from, to, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY, NULL))
- log_warning_errno(errno, "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"
- "net/tun\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)
- return log_error_errno(errno, "Failed to stat %s: %m", from);
-
- } 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 {
- r = mkdir_parents(to, 0775);
- if (r < 0) {
- log_error_errno(r, "Failed to create parent directory of %s: %m", to);
- return -r;
- }
-
- if (mknod(to, st.st_mode, st.st_rdev) < 0) {
- if (errno != EPERM)
- return log_error_errno(errno, "mknod(%s) failed: %m", to);
-
- /* Some systems abusively restrict mknod but
- * allow bind mounts. */
- r = touch(to);
- if (r < 0)
- return log_error_errno(r, "touch (%s) failed: %m", to);
- if (mount(from, to, NULL, MS_BIND, NULL) < 0)
- return log_error_errno(errno, "Both mknod and bind mount (%s) failed: %m", to);
- }
-
- if (arg_userns && arg_uid_shift != UID_INVALID)
- if (lchown(to, arg_uid_shift, arg_uid_shift) < 0)
- return log_error_errno(errno, "chown() of device node %s failed: %m", to);
- }
- }
-
- 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)
- return log_error_errno(errno, "Failed to create /dev/ptmx symlink: %m");
-
- if (arg_userns && arg_uid_shift != UID_INVALID)
- if (lchown(p, arg_uid_shift, arg_uid_shift) < 0)
- return log_error_errno(errno, "lchown() of symlink %s failed: %m", p);
-
- return 0;
-}
-
-static int setup_dev_console(const char *dest, const char *console) {
- _cleanup_umask_ mode_t u;
- const char *to;
- int r;
-
- assert(dest);
- assert(console);
-
- u = umask(0000);
-
- r = chmod_and_chown(console, 0600, 0, 0);
- if (r < 0)
- return log_error_errno(r, "Failed to correct access mode for TTY: %m");
-
- /* We need to bind mount the right tty to /dev/console since
- * ptys can only exist on pts file systems. To have something
- * to bind mount things on we create a empty regular file. */
-
- to = strjoina(dest, "/dev/console");
- r = touch(to);
- if (r < 0)
- return log_error_errno(r, "touch() for /dev/console failed: %m");
-
- if (mount(console, to, NULL, MS_BIND, NULL) < 0)
- return log_error_errno(errno, "Bind mount for /dev/console failed: %m");
-
- return 0;
-}
-
-static int setup_kmsg(const char *dest, int kmsg_socket) {
- _cleanup_free_ char *from = NULL, *to = NULL;
- _cleanup_umask_ mode_t u;
- int r, fd, k;
- 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
- * delete it after bind mounting it to /proc/kmsg. While FIFOs
- * on the reading side behave very similar to /proc/kmsg,
- * their writing side behaves differently from /dev/kmsg in
- * that writing blocks when nothing is reading. In order to
- * avoid any problems with containers deadlocking due to this
- * we simply make /dev/kmsg unavailable to the container. */
- if (asprintf(&from, "%s/dev/kmsg", dest) < 0 ||
- asprintf(&to, "%s/proc/kmsg", dest) < 0)
- return log_oom();
-
- if (mkfifo(from, 0600) < 0)
- return log_error_errno(errno, "mkfifo() for /dev/kmsg failed: %m");
-
- r = chmod_and_chown(from, 0600, 0, 0);
- if (r < 0)
- return log_error_errno(r, "Failed to correct access mode for /dev/kmsg: %m");
-
- if (mount(from, to, NULL, MS_BIND, NULL) < 0)
- return log_error_errno(errno, "Bind mount for /proc/kmsg failed: %m");
-
- fd = open(from, O_RDWR|O_NDELAY|O_CLOEXEC);
- if (fd < 0)
- return log_error_errno(errno, "Failed to open fifo: %m");
-
- 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
- * long as we run the child */
- k = sendmsg(kmsg_socket, &mh, MSG_NOSIGNAL);
- safe_close(fd);
-
- if (k < 0)
- return log_error_errno(errno, "Failed to send FIFO fd: %m");
-
- /* And now make the FIFO unavailable as /dev/kmsg... */
- unlink(from);
- return 0;
-}
-
-static int send_rtnl(int send_fd) {
- 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;
- _cleanup_close_ int fd = -1;
- ssize_t k;
-
- assert(send_fd >= 0);
-
- if (!arg_expose_ports)
- return 0;
-
- fd = socket(PF_NETLINK, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK, NETLINK_ROUTE);
- if (fd < 0)
- return log_error_errno(errno, "failed to allocate container netlink: %m");
-
- 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
- * long as we run the child */
- k = sendmsg(send_fd, &mh, MSG_NOSIGNAL);
- if (k < 0)
- return log_error_errno(errno, "Failed to send netlink fd: %m");
-
- return 0;
-}
-
-static int flush_ports(union in_addr_union *exposed) {
- ExposePort *p;
- int r, af = AF_INET;
-
- assert(exposed);
-
- if (!arg_expose_ports)
- return 0;
-
- if (in_addr_is_null(af, exposed))
- return 0;
-
- log_debug("Lost IP address.");
-
- LIST_FOREACH(ports, p, arg_expose_ports) {
- r = fw_add_local_dnat(false,
- af,
- p->protocol,
- NULL,
- NULL, 0,
- NULL, 0,
- p->host_port,
- exposed,
- p->container_port,
- NULL);
- if (r < 0)
- log_warning_errno(r, "Failed to modify firewall: %m");
- }
-
- *exposed = IN_ADDR_NULL;
- return 0;
-}
-
-static int expose_ports(sd_rtnl *rtnl, union in_addr_union *exposed) {
- _cleanup_free_ struct local_address *addresses = NULL;
- _cleanup_free_ char *pretty = NULL;
- union in_addr_union new_exposed;
- ExposePort *p;
- bool add;
- int af = AF_INET, r;
-
- assert(exposed);
-
- /* Invoked each time an address is added or removed inside the
- * container */
-
- if (!arg_expose_ports)
- return 0;
-
- r = local_addresses(rtnl, 0, af, &addresses);
- if (r < 0)
- return log_error_errno(r, "Failed to enumerate local addresses: %m");
-
- add = r > 0 &&
- addresses[0].family == af &&
- addresses[0].scope < RT_SCOPE_LINK;
-
- if (!add)
- return flush_ports(exposed);
-
- new_exposed = addresses[0].address;
- if (in_addr_equal(af, exposed, &new_exposed))
- return 0;
-
- in_addr_to_string(af, &new_exposed, &pretty);
- log_debug("New container IP is %s.", strna(pretty));
-
- LIST_FOREACH(ports, p, arg_expose_ports) {
-
- r = fw_add_local_dnat(true,
- af,
- p->protocol,
- NULL,
- NULL, 0,
- NULL, 0,
- p->host_port,
- &new_exposed,
- p->container_port,
- in_addr_is_null(af, exposed) ? NULL : exposed);
- if (r < 0)
- log_warning_errno(r, "Failed to modify firewall: %m");
- }
-
- *exposed = new_exposed;
- return 0;
-}
-
-static int on_address_change(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
- union in_addr_union *exposed = userdata;
-
- assert(rtnl);
- assert(m);
- assert(exposed);
-
- expose_ports(rtnl, exposed);
- return 0;
-}
-
-static int watch_rtnl(sd_event *event, int recv_fd, union in_addr_union *exposed, sd_rtnl **ret) {
- 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;
- _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
- int fd, r;
- ssize_t k;
-
- assert(event);
- assert(recv_fd >= 0);
- assert(ret);
-
- if (!arg_expose_ports)
- return 0;
-
- k = recvmsg(recv_fd, &mh, MSG_NOSIGNAL);
- if (k < 0)
- return log_error_errno(errno, "Failed to recv netlink fd: %m");
-
- cmsg = CMSG_FIRSTHDR(&mh);
- assert(cmsg->cmsg_level == SOL_SOCKET);
- assert(cmsg->cmsg_type == SCM_RIGHTS);
- assert(cmsg->cmsg_len == CMSG_LEN(sizeof(int)));
- memcpy(&fd, CMSG_DATA(cmsg), sizeof(int));
-
- r = sd_rtnl_open_fd(&rtnl, fd, 1, RTNLGRP_IPV4_IFADDR);
- if (r < 0) {
- safe_close(fd);
- return log_error_errno(r, "Failed to create rtnl object: %m");
- }
-
- r = sd_rtnl_add_match(rtnl, RTM_NEWADDR, on_address_change, exposed);
- if (r < 0)
- return log_error_errno(r, "Failed to subscribe to RTM_NEWADDR messages: %m");
-
- r = sd_rtnl_add_match(rtnl, RTM_DELADDR, on_address_change, exposed);
- if (r < 0)
- return log_error_errno(r, "Failed to subscribe to RTM_DELADDR messages: %m");
-
- r = sd_rtnl_attach_event(rtnl, event, 0);
- if (r < 0)
- return log_error_errno(r, "Failed to add to even loop: %m");
-
- *ret = rtnl;
- rtnl = NULL;
-
- return 0;
-}
-
-static int setup_hostname(void) {
-
- if (arg_share_system)
- return 0;
-
- if (sethostname_idempotent(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;
-
- /* Don't link journals in ephemeral mode */
- if (arg_ephemeral)
- return 0;
-
- 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)
- return log_error_errno(r, "Failed to read machine ID from %s: %m", p);
-
- 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)
- return log_error_errno(r, "Failed to parse machine ID from %s: %m", p);
-
- r = sd_id128_get_machine(&this_id);
- if (r < 0)
- return log_error_errno(r, "Failed to retrieve machine ID: %m");
-
- 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_errno(errno, "Failed to create directory %s: %m", q);
- return 0;
- }
-
- if (unlink(p) < 0)
- return log_error_errno(errno, "Failed to remove symlink %s: %m", p);
- } 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_errno(errno, "Failed to remove %s: %m", p);
- return -errno;
- }
- }
- } else if (r != -ENOENT) {
- log_error_errno(errno, "readlink(%s) failed: %m", p);
- return r;
- }
-
- if (arg_link_journal == LINK_GUEST) {
-
- if (symlink(q, p) < 0) {
- if (arg_link_journal_try) {
- log_debug_errno(errno, "Failed to symlink %s to %s, skipping journal setup: %m", q, p);
- return 0;
- } else {
- log_error_errno(errno, "Failed to symlink %s to %s: %m", q, p);
- return -errno;
- }
- }
-
- r = mkdir_p(q, 0755);
- if (r < 0)
- log_warning_errno(errno, "Failed to create directory %s: %m", q);
- return 0;
- }
-
- if (arg_link_journal == LINK_HOST) {
- /* don't create parents here -- if the host doesn't have
- * permanent journal set up, don't force it here */
- r = mkdir(p, 0755);
- if (r < 0) {
- if (arg_link_journal_try) {
- log_debug_errno(errno, "Failed to create %s, skipping journal setup: %m", p);
- return 0;
- } else {
- log_error_errno(errno, "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_errno(errno, "Failed to create %s: %m", q);
- return r;
- }
-
- if (mount(p, q, NULL, MS_BIND, NULL) < 0)
- return log_error_errno(errno, "Failed to bind mount journal from host into guest: %m");
-
- return 0;
-}
-
-static int drop_capabilities(void) {
- return capability_bounding_set_drop(~arg_retain, false);
-}
-
-static int register_machine(pid_t pid, int local_ifindex) {
- _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
- _cleanup_bus_close_unref_ sd_bus *bus = NULL;
- int r;
-
- if (!arg_register)
- return 0;
-
- r = sd_bus_default_system(&bus);
- if (r < 0)
- return log_error_errno(r, "Failed to open system bus: %m");
-
- if (arg_keep_unit) {
- r = sd_bus_call_method(
- bus,
- "org.freedesktop.machine1",
- "/org/freedesktop/machine1",
- "org.freedesktop.machine1.Manager",
- "RegisterMachineWithNetwork",
- &error,
- NULL,
- "sayssusai",
- arg_machine,
- SD_BUS_MESSAGE_APPEND_ID128(arg_uuid),
- "nspawn",
- "container",
- (uint32_t) pid,
- strempty(arg_directory),
- local_ifindex > 0 ? 1 : 0, local_ifindex);
- } else {
- _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
- char **i;
-
- r = sd_bus_message_new_method_call(
- bus,
- &m,
- "org.freedesktop.machine1",
- "/org/freedesktop/machine1",
- "org.freedesktop.machine1.Manager",
- "CreateMachineWithNetwork");
- if (r < 0)
- return bus_log_create_error(r);
-
- r = sd_bus_message_append(
- m,
- "sayssusai",
- arg_machine,
- SD_BUS_MESSAGE_APPEND_ID128(arg_uuid),
- "nspawn",
- "container",
- (uint32_t) pid,
- strempty(arg_directory),
- local_ifindex > 0 ? 1 : 0, local_ifindex);
- if (r < 0)
- return bus_log_create_error(r);
-
- r = sd_bus_message_open_container(m, 'a', "(sv)");
- if (r < 0)
- return bus_log_create_error(r);
-
- if (!isempty(arg_slice)) {
- r = sd_bus_message_append(m, "(sv)", "Slice", "s", arg_slice);
- if (r < 0)
- return bus_log_create_error(r);
- }
-
- r = sd_bus_message_append(m, "(sv)", "DevicePolicy", "s", "strict");
- if (r < 0)
- return bus_log_create_error(r);
-
- r = sd_bus_message_append(m, "(sv)", "DeviceAllow", "a(ss)", 9,
- /* Allow the container to
- * access and create the API
- * device nodes, so that
- * PrivateDevices= in the
- * container can work
- * fine */
- "/dev/null", "rwm",
- "/dev/zero", "rwm",
- "/dev/full", "rwm",
- "/dev/random", "rwm",
- "/dev/urandom", "rwm",
- "/dev/tty", "rwm",
- "/dev/net/tun", "rwm",
- /* Allow the container
- * access to ptys. However,
- * do not permit the
- * container to ever create
- * these device nodes. */
- "/dev/pts/ptmx", "rw",
- "char-pts", "rw");
- if (r < 0)
- return log_error_errno(r, "Failed to add device whitelist: %m");
-
- STRV_FOREACH(i, arg_property) {
- r = sd_bus_message_open_container(m, 'r', "sv");
- if (r < 0)
- return bus_log_create_error(r);
-
- r = bus_append_unit_property_assignment(m, *i);
- if (r < 0)
- return r;
-
- r = sd_bus_message_close_container(m);
- if (r < 0)
- return bus_log_create_error(r);
- }
-
- r = sd_bus_message_close_container(m);
- if (r < 0)
- return bus_log_create_error(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_close_unref_ sd_bus *bus = NULL;
- const char *path;
- int r;
-
- if (!arg_register)
- return 0;
-
- r = sd_bus_default_system(&bus);
- if (r < 0)
- return log_error_errno(r, "Failed to open system bus: %m");
-
- 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
- * cleaned up automatically, hence don't consider it a
- * failure if we cannot get the machine object. */
- 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)
- return log_error_errno(r, "Failed to read /proc/self/loginuid: %m");
-
- /* 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 HOST_HASH_KEY SD_ID128_MAKE(1a,37,6f,c7,46,ec,45,0b,ad,a3,d5,31,06,60,5d,b1)
-#define CONTAINER_HASH_KEY SD_ID128_MAKE(c3,c4,f9,19,b5,57,b2,1c,e6,cf,14,27,03,9c,ee,a2)
-#define MACVLAN_HASH_KEY SD_ID128_MAKE(00,13,6d,bc,66,83,44,81,bb,0c,f9,51,1f,24,a6,6f)
-
-static int generate_mac(struct ether_addr *mac, sd_id128_t hash_key, uint64_t idx) {
- uint8_t result[8];
- size_t l, sz;
- uint8_t *v, *i;
- int r;
-
- l = strlen(arg_machine);
- sz = sizeof(sd_id128_t) + l;
- if (idx > 0)
- sz += sizeof(idx);
-
- 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
- * container instance */
- i = mempcpy(v + sizeof(sd_id128_t), arg_machine, l);
- if (idx > 0) {
- idx = htole64(idx);
- memcpy(i, &idx, sizeof(idx));
- }
-
- /* Let's hash the host machine ID plus the container name. We
- * use a fixed, but originally randomly created hash key here. */
- 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], int *ifi) {
- _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
- _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
- struct ether_addr mac_host, mac_container;
- int r, i;
-
- if (!arg_private_network)
- return 0;
-
- if (!arg_network_veth)
- return 0;
-
- /* Use two different interface name prefixes depending whether
- * we are in bridge mode or not. */
- snprintf(iface_name, IFNAMSIZ - 1, "%s-%s",
- arg_network_bridge ? "vb" : "ve", arg_machine);
-
- r = generate_mac(&mac_container, CONTAINER_HASH_KEY, 0);
- if (r < 0)
- return log_error_errno(r, "Failed to generate predictable MAC address for container side: %m");
-
- r = generate_mac(&mac_host, HOST_HASH_KEY, 0);
- if (r < 0)
- return log_error_errno(r, "Failed to generate predictable MAC address for host side: %m");
-
- r = sd_rtnl_open(&rtnl, 0);
- if (r < 0)
- return log_error_errno(r, "Failed to connect to netlink: %m");
-
- r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
- if (r < 0)
- return log_error_errno(r, "Failed to allocate netlink message: %m");
-
- r = sd_rtnl_message_append_string(m, IFLA_IFNAME, iface_name);
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink interface name: %m");
-
- r = sd_rtnl_message_append_ether_addr(m, IFLA_ADDRESS, &mac_host);
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink MAC address: %m");
-
- r = sd_rtnl_message_open_container(m, IFLA_LINKINFO);
- if (r < 0)
- return log_error_errno(r, "Failed to open netlink container: %m");
-
- r = sd_rtnl_message_open_container_union(m, IFLA_INFO_DATA, "veth");
- if (r < 0)
- return log_error_errno(r, "Failed to open netlink container: %m");
-
- r = sd_rtnl_message_open_container(m, VETH_INFO_PEER);
- if (r < 0)
- return log_error_errno(r, "Failed to open netlink container: %m");
-
- r = sd_rtnl_message_append_string(m, IFLA_IFNAME, "host0");
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink interface name: %m");
-
- r = sd_rtnl_message_append_ether_addr(m, IFLA_ADDRESS, &mac_container);
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink MAC address: %m");
-
- r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid);
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink namespace field: %m");
-
- r = sd_rtnl_message_close_container(m);
- if (r < 0)
- return log_error_errno(r, "Failed to close netlink container: %m");
-
- r = sd_rtnl_message_close_container(m);
- if (r < 0)
- return log_error_errno(r, "Failed to close netlink container: %m");
-
- r = sd_rtnl_message_close_container(m);
- if (r < 0)
- return log_error_errno(r, "Failed to close netlink container: %m");
-
- r = sd_rtnl_call(rtnl, m, 0, NULL);
- if (r < 0)
- return log_error_errno(r, "Failed to add new veth interfaces: %m");
-
- i = (int) if_nametoindex(iface_name);
- if (i <= 0)
- return log_error_errno(errno, "Failed to resolve interface %s: %m", iface_name);
-
- *ifi = i;
-
- return 0;
-}
-
-static int setup_bridge(const char veth_name[], int *ifi) {
- _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)
- return log_error_errno(errno, "Failed to resolve interface %s: %m", arg_network_bridge);
-
- *ifi = bridge;
-
- r = sd_rtnl_open(&rtnl, 0);
- if (r < 0)
- return log_error_errno(r, "Failed to connect to netlink: %m");
-
- r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, 0);
- if (r < 0)
- return log_error_errno(r, "Failed to allocate netlink message: %m");
-
- r = sd_rtnl_message_link_set_flags(m, IFF_UP, IFF_UP);
- if (r < 0)
- return log_error_errno(r, "Failed to set IFF_UP flag: %m");
-
- r = sd_rtnl_message_append_string(m, IFLA_IFNAME, veth_name);
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink interface name field: %m");
-
- r = sd_rtnl_message_append_u32(m, IFLA_MASTER, bridge);
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink master field: %m");
-
- r = sd_rtnl_call(rtnl, m, 0, NULL);
- if (r < 0)
- return log_error_errno(r, "Failed to add veth interface to bridge: %m");
-
- 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)
- return log_error_errno(errno, "Failed to resolve interface %s: %m", name);
-
- sprintf(ifi_str, "n%i", ifi);
- d = udev_device_new_from_device_id(udev, ifi_str);
- if (!d)
- return log_error_errno(errno, "Failed to get udev device for interface %s: %m", name);
-
- 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)
- return log_error_errno(r, "Failed to connect to netlink: %m");
-
- 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_SETLINK, ifi);
- if (r < 0)
- return log_error_errno(r, "Failed to allocate netlink message: %m");
-
- r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid);
- if (r < 0)
- return log_error_errno(r, "Failed to append namespace PID to netlink message: %m");
-
- r = sd_rtnl_call(rtnl, m, 0, NULL);
- if (r < 0)
- return log_error_errno(r, "Failed to move interface %s to namespace: %m", *i);
- }
-
- return 0;
-}
-
-static int setup_macvlan(pid_t pid) {
- _cleanup_udev_unref_ struct udev *udev = NULL;
- _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
- unsigned idx = 0;
- 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)
- return log_error_errno(r, "Failed to connect to netlink: %m");
-
- 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;
- struct ether_addr mac;
- int ifi;
-
- ifi = parse_interface(udev, *i);
- if (ifi < 0)
- return ifi;
-
- r = generate_mac(&mac, MACVLAN_HASH_KEY, idx++);
- if (r < 0)
- return log_error_errno(r, "Failed to create MACVLAN MAC address: %m");
-
- r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
- if (r < 0)
- return log_error_errno(r, "Failed to allocate netlink message: %m");
-
- r = sd_rtnl_message_append_u32(m, IFLA_LINK, ifi);
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink interface index: %m");
-
- 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)
- return log_error_errno(r, "Failed to add netlink interface name: %m");
-
- r = sd_rtnl_message_append_ether_addr(m, IFLA_ADDRESS, &mac);
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink MAC address: %m");
-
- r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid);
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink namespace field: %m");
-
- r = sd_rtnl_message_open_container(m, IFLA_LINKINFO);
- if (r < 0)
- return log_error_errno(r, "Failed to open netlink container: %m");
-
- r = sd_rtnl_message_open_container_union(m, IFLA_INFO_DATA, "macvlan");
- if (r < 0)
- return log_error_errno(r, "Failed to open netlink container: %m");
-
- r = sd_rtnl_message_append_u32(m, IFLA_MACVLAN_MODE, MACVLAN_MODE_BRIDGE);
- if (r < 0)
- return log_error_errno(r, "Failed to append macvlan mode: %m");
-
- r = sd_rtnl_message_close_container(m);
- if (r < 0)
- return log_error_errno(r, "Failed to close netlink container: %m");
-
- r = sd_rtnl_message_close_container(m);
- if (r < 0)
- return log_error_errno(r, "Failed to close netlink container: %m");
-
- r = sd_rtnl_call(rtnl, m, 0, NULL);
- if (r < 0)
- return log_error_errno(r, "Failed to add new macvlan interfaces: %m");
- }
-
- return 0;
-}
-
-static int setup_ipvlan(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_ipvlan))
- return 0;
-
- r = sd_rtnl_open(&rtnl, 0);
- if (r < 0)
- return log_error_errno(r, "Failed to connect to netlink: %m");
-
- udev = udev_new();
- if (!udev) {
- log_error("Failed to connect to udev.");
- return -ENOMEM;
- }
-
- STRV_FOREACH(i, arg_network_ipvlan) {
- _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)
- return log_error_errno(r, "Failed to allocate netlink message: %m");
-
- r = sd_rtnl_message_append_u32(m, IFLA_LINK, ifi);
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink interface index: %m");
-
- n = strappend("iv-", *i);
- if (!n)
- return log_oom();
-
- strshorten(n, IFNAMSIZ-1);
-
- r = sd_rtnl_message_append_string(m, IFLA_IFNAME, n);
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink interface name: %m");
-
- r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid);
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink namespace field: %m");
-
- r = sd_rtnl_message_open_container(m, IFLA_LINKINFO);
- if (r < 0)
- return log_error_errno(r, "Failed to open netlink container: %m");
-
- r = sd_rtnl_message_open_container_union(m, IFLA_INFO_DATA, "ipvlan");
- if (r < 0)
- return log_error_errno(r, "Failed to open netlink container: %m");
-
- r = sd_rtnl_message_append_u16(m, IFLA_IPVLAN_MODE, IPVLAN_MODE_L2);
- if (r < 0)
- return log_error_errno(r, "Failed to add ipvlan mode: %m");
-
- r = sd_rtnl_message_close_container(m);
- if (r < 0)
- return log_error_errno(r, "Failed to close netlink container: %m");
-
- r = sd_rtnl_message_close_container(m);
- if (r < 0)
- return log_error_errno(r, "Failed to close netlink container: %m");
-
- r = sd_rtnl_call(rtnl, m, 0, NULL);
- if (r < 0)
- return log_error_errno(r, "Failed to add new ipvlan interfaces: %m");
- }
-
- return 0;
-}
-
-static int setup_seccomp(void) {
-
-#ifdef HAVE_SECCOMP
- static const struct {
- uint64_t capability;
- int syscall_num;
- } blacklist[] = {
- { CAP_SYS_RAWIO, SCMP_SYS(iopl)},
- { CAP_SYS_RAWIO, SCMP_SYS(ioperm)},
- { CAP_SYS_BOOT, SCMP_SYS(kexec_load)},
- { CAP_SYS_ADMIN, SCMP_SYS(swapon)},
- { CAP_SYS_ADMIN, SCMP_SYS(swapoff)},
- { CAP_SYS_ADMIN, SCMP_SYS(open_by_handle_at)},
- { CAP_SYS_MODULE, SCMP_SYS(init_module)},
- { CAP_SYS_MODULE, SCMP_SYS(finit_module)},
- { CAP_SYS_MODULE, SCMP_SYS(delete_module)},
- };
-
- scmp_filter_ctx seccomp;
- unsigned i;
- int r;
-
- seccomp = seccomp_init(SCMP_ACT_ALLOW);
- if (!seccomp)
- return log_oom();
-
- r = seccomp_add_secondary_archs(seccomp);
- if (r < 0) {
- log_error_errno(r, "Failed to add secondary archs to seccomp filter: %m");
- goto finish;
- }
-
- for (i = 0; i < ELEMENTSOF(blacklist); i++) {
- if (arg_retain & (1ULL << blacklist[i].capability))
- continue;
-
- r = seccomp_rule_add(seccomp, SCMP_ACT_ERRNO(EPERM), blacklist[i].syscall_num, 0);
- if (r == -EFAULT)
- continue; /* unknown syscall */
- if (r < 0) {
- log_error_errno(r, "Failed to block syscall: %m");
- goto finish;
- }
- }
-
-
- /*
- Audit is broken in containers, much of the userspace audit
- hookup will fail if running inside a container. We don't
- care and just turn off creation of audit sockets.
-
- This will make socket(AF_NETLINK, *, NETLINK_AUDIT) fail
- with EAFNOSUPPORT which audit userspace uses as indication
- that audit is disabled in the kernel.
- */
-
- 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_errno(r, "Failed to add audit seccomp rule: %m");
- goto finish;
- }
-
- r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
- if (r < 0) {
- log_error_errno(r, "Failed to unset NO_NEW_PRIVS: %m");
- goto finish;
- }
-
- r = seccomp_load(seccomp);
- if (r < 0)
- log_error_errno(r, "Failed to install seccomp audit filter: %m");
-
-finish:
- seccomp_release(seccomp);
- return r;
-#else
- return 0;
-#endif
-
-}
-
-static int setup_propagate(const char *root) {
- const char *p, *q;
-
- (void) mkdir_p("/run/systemd/nspawn/", 0755);
- (void) mkdir_p("/run/systemd/nspawn/propagate", 0600);
- p = strjoina("/run/systemd/nspawn/propagate/", arg_machine);
- (void) mkdir_p(p, 0600);
-
- q = strjoina(root, "/run/systemd/nspawn/incoming");
- mkdir_parents(q, 0755);
- mkdir_p(q, 0600);
-
- if (mount(p, q, NULL, MS_BIND, NULL) < 0)
- return log_error_errno(errno, "Failed to install propagation bind mount.");
-
- if (mount(NULL, q, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY, NULL) < 0)
- return log_error_errno(errno, "Failed to make propagation mount read-only");
-
- return 0;
-}
-
-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);
- assert(arg_image);
-
- fd = open(arg_image, O_CLOEXEC|(arg_read_only ? O_RDONLY : O_RDWR)|O_NONBLOCK|O_NOCTTY);
- if (fd < 0)
- return log_error_errno(errno, "Failed to open %s: %m", arg_image);
-
- if (fstat(fd, &st) < 0)
- return log_error_errno(errno, "Failed to stat %s: %m", arg_image);
-
- 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_errno(errno, "%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)
- return log_error_errno(errno, "Failed to open /dev/loop-control: %m");
-
- nr = ioctl(control, LOOP_CTL_GET_FREE);
- if (nr < 0)
- return log_error_errno(errno, "Failed to allocate loop device: %m");
-
- 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)
- return log_error_errno(errno, "Failed to open loop device %s: %m", loopdev);
-
- if (ioctl(loop, LOOP_SET_FD, fd) < 0)
- return log_error_errno(errno, "Failed to set loopback file descriptor on %s: %m", loopdev);
-
- if (arg_read_only)
- info.lo_flags |= LO_FLAGS_READ_ONLY;
-
- if (ioctl(loop, LOOP_SET_STATUS64, &info) < 0)
- return log_error_errno(errno, "Failed to set loopback settings on %s: %m", loopdev);
-
- *device_path = loopdev;
- loopdev = NULL;
-
- *loop_nr = nr;
-
- r = loop;
- loop = -1;
-
- return r;
-}
-
-#define PARTITION_TABLE_BLURB \
- "Note that the disk image needs to either contain only a single MBR partition of\n" \
- "type 0x83 that is marked bootable, or a single GPT partition of type " \
- "0FC63DAF-8483-4772-8E79-3D69D8477DE4 or follow\n" \
- " http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/\n" \
- "to be bootable with systemd-nspawn."
-
-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, srv_nr = -1;
-#ifdef GPT_ROOT_NATIVE
- int root_nr = -1;
-#endif
-#ifdef GPT_ROOT_SECONDARY
- int secondary_root_nr = -1;
-#endif
- _cleanup_free_ char *home = NULL, *root = NULL, *secondary_root = NULL, *srv = NULL, *generic = 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, generic_rw = true;
- bool is_gpt, is_mbr, multiple_generic = false;
- const char *pttype = NULL;
- blkid_partlist pl;
- struct stat st;
- unsigned i;
- int r;
-
- assert(fd >= 0);
- assert(root_device);
- assert(home_device);
- assert(srv_device);
- assert(secondary);
- assert(arg_image);
-
- 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_errno(errno, "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\n"
- " %s\n"
- PARTITION_TABLE_BLURB, arg_image);
- return -EINVAL;
- } else if (r != 0) {
- if (errno == 0)
- errno = EIO;
- log_error_errno(errno, "Failed to probe: %m");
- return -errno;
- }
-
- (void) blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL);
-
- is_gpt = streq_ptr(pttype, "gpt");
- is_mbr = streq_ptr(pttype, "dos");
-
- if (!is_gpt && !is_mbr) {
- log_error("No GPT or MBR partition table discovered on\n"
- " %s\n"
- PARTITION_TABLE_BLURB, 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)
- return log_error_errno(errno, "Failed to stat block device: %m");
-
- d = udev_device_new_from_devnum(udev, 'b', st.st_rdev);
- if (!d)
- return log_oom();
-
- for (i = 0;; i++) {
- int n, m;
-
- if (i >= 10) {
- log_error("Kernel partitions never appeared.");
- return -ENXIO;
- }
-
- 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)
- return log_error_errno(r, "Failed to scan for partition devices of %s: %m", arg_image);
-
- /* Count the partitions enumerated by the kernel */
- n = 0;
- first = udev_enumerate_get_list_entry(e);
- udev_list_entry_foreach(item, first)
- n++;
-
- /* Count the partitions enumerated by blkid */
- m = blkid_partlist_numof_partitions(pl);
- if (n == m + 1)
- break;
- if (n > m + 1) {
- log_error("blkid and kernel partition list do not match.");
- return -EIO;
- }
- if (n < m + 1) {
- unsigned j;
-
- /* The kernel has probed fewer partitions than
- * blkid? Maybe the kernel prober is still
- * running or it got EBUSY because udev
- * already opened the device. Let's reprobe
- * the device, which is a synchronous call
- * that waits until probing is complete. */
-
- for (j = 0; j < 20; j++) {
-
- r = ioctl(fd, BLKRRPART, 0);
- if (r < 0)
- r = -errno;
- if (r >= 0 || r != -EBUSY)
- break;
-
- /* If something else has the device
- * open, such as an udev rule, the
- * ioctl will return EBUSY. Since
- * there's no way to wait until it
- * isn't busy anymore, let's just wait
- * a bit, and try again.
- *
- * This is really something they
- * should fix in the kernel! */
-
- usleep(50 * USEC_PER_MSEC);
- }
-
- if (r < 0)
- return log_error_errno(r, "Failed to reread partition table: %m");
- }
-
- e = udev_enumerate_unref(e);
- }
-
- first = udev_enumerate_get_list_entry(e);
- udev_list_entry_foreach(item, first) {
- _cleanup_udev_device_unref_ struct udev_device *q;
- const char *node;
- unsigned long long flags;
- 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_errno(errno, "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);
-
- nr = blkid_partition_get_partno(pp);
- if (nr < 0)
- continue;
-
- if (is_gpt) {
- sd_id128_t type_id;
- const char *stype;
-
- if (flags & GPT_FLAG_NO_AUTO)
- 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);
-
- r = free_and_strdup(&home, node);
- if (r < 0)
- 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);
-
- r = free_and_strdup(&srv, node);
- if (r < 0)
- 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);
-
- r = free_and_strdup(&root, node);
- if (r < 0)
- 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);
-
- r = free_and_strdup(&secondary_root, node);
- if (r < 0)
- return log_oom();
- }
-#endif
- else if (sd_id128_equal(type_id, GPT_LINUX_GENERIC)) {
-
- if (generic)
- multiple_generic = true;
- else {
- generic_rw = !(flags & GPT_FLAG_READ_ONLY);
-
- r = free_and_strdup(&generic, node);
- if (r < 0)
- return log_oom();
- }
- }
-
- } else if (is_mbr) {
- int type;
-
- if (flags != 0x80) /* Bootable flag */
- continue;
-
- type = blkid_partition_get_type(pp);
- if (type != 0x83) /* Linux partition */
- continue;
-
- if (generic)
- multiple_generic = true;
- else {
- generic_rw = true;
-
- r = free_and_strdup(&root, node);
- if (r < 0)
- return log_oom();
- }
- }
- }
-
- 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;
- } else if (generic) {
-
- /* There were no partitions with precise meanings
- * around, but we found generic partitions. In this
- * case, if there's only one, we can go ahead and boot
- * it, otherwise we bail out, because we really cannot
- * make any sense of it. */
-
- if (multiple_generic) {
- log_error("Identified multiple bootable Linux partitions on\n"
- " %s\n"
- PARTITION_TABLE_BLURB, arg_image);
- return -EINVAL;
- }
-
- *root_device = generic;
- generic = NULL;
-
- *root_device_rw = generic_rw;
- *secondary = false;
- } else {
- log_error("Failed to identify root partition in disk image\n"
- " %s\n"
- PARTITION_TABLE_BLURB, arg_image);
- return -EINVAL;
- }
-
- 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 -EOPNOTSUPP;
-#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 = strjoina(where, directory);
- else
- p = where;
-
- errno = 0;
- b = blkid_new_probe_from_filename(what);
- if (!b) {
- if (errno == 0)
- return log_oom();
- log_error_errno(errno, "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_errno(errno, "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 -EOPNOTSUPP;
- }
-
- if (mount(what, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), NULL) < 0)
- return log_error_errno(errno, "Failed to mount %s: %m", what);
-
- return 0;
-#else
- log_error("--image= is not supported, compiled without blkid support.");
- return -EOPNOTSUPP;
-#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)
- return log_error_errno(r, "Failed to mount root directory: %m");
- }
-
- if (home_device) {
- r = mount_device(home_device, arg_directory, "/home", home_device_rw);
- if (r < 0)
- return log_error_errno(r, "Failed to mount home directory: %m");
- }
-
- if (srv_device) {
- r = mount_device(srv_device, arg_directory, "/srv", srv_device_rw);
- if (r < 0)
- return log_error_errno(r, "Failed to mount server data directory: %m");
- }
-
- return 0;
-}
-
-static void loop_remove(int nr, int *image_fd) {
- _cleanup_close_ int control = -1;
- int r;
-
- if (nr < 0)
- return;
-
- if (image_fd && *image_fd >= 0) {
- r = ioctl(*image_fd, LOOP_CLR_FD);
- if (r < 0)
- log_debug_errno(errno, "Failed to close loop image: %m");
- *image_fd = safe_close(*image_fd);
- }
-
- control = open("/dev/loop-control", O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
- if (control < 0) {
- log_warning_errno(errno, "Failed to open /dev/loop-control: %m");
- return;
- }
-
- r = ioctl(control, LOOP_CTL_REMOVE, nr);
- if (r < 0)
- log_debug_errno(errno, "Failed to remove loop %d: %m", 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)
- return log_error_errno(errno, "Failed to allocate pipe: %m");
-
- pid = fork();
- if (pid < 0)
- return log_error_errno(errno, "Failed to fork getent child: %m");
- 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], *x, *u, *g, *h;
- const char *word, *state;
- _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)
- return log_error_errno(errno, "setgroups() failed: %m");
-
- if (setresgid(0, 0, 0) < 0)
- return log_error_errno(errno, "setregid() failed: %m");
-
- if (setresuid(0, 0, 0) < 0)
- return log_error_errno(errno, "setreuid() failed: %m");
-
- *_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_errno(errno, "Failed to read from getent: %m");
- return -errno;
- }
-
- truncate_nl(line);
-
- wait_for_terminate_and_warn("getent passwd", pid, true);
-
- 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_errno(errno, "Failed to read from getent: %m");
- return -errno;
- }
-
- truncate_nl(line);
-
- wait_for_terminate_and_warn("getent initgroups", pid, true);
-
- /* Skip over the username and subsequent separator whitespace */
- x = line;
- x += strcspn(x, WHITESPACE);
- x += strspn(x, WHITESPACE);
-
- FOREACH_WORD(word, l, x, state) {
- char c[l+1];
-
- memcpy(c, word, 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)
- return log_error_errno(r, "Failed to make home root directory: %m");
-
- r = mkdir_safe(home, 0755, uid, gid);
- if (r < 0 && r != -EEXIST)
- return log_error_errno(r, "Failed to make home directory: %m");
-
- fchown(STDIN_FILENO, uid, gid);
- fchown(STDOUT_FILENO, uid, gid);
- fchown(STDERR_FILENO, uid, gid);
-
- if (setgroups(n_uids, uids) < 0)
- return log_error_errno(errno, "Failed to set auxiliary groups: %m");
-
- if (setresgid(gid, gid, gid) < 0)
- return log_error_errno(errno, "setregid() failed: %m");
-
- if (setresuid(uid, uid, uid) < 0)
- return log_error_errno(errno, "setreuid() failed: %m");
-
- if (_home) {
- *_home = home;
- home = NULL;
- }
-
- return 0;
-}
-
-/*
- * Return values:
- * < 0 : wait_for_terminate() failed to get the state of the
- * container, the container was terminated by a signal, or
- * failed for an unknown reason. No change is made to the
- * container argument.
- * > 0 : The program executed in the container terminated with an
- * error. The exit code of the program executed in the
- * container is returned. The container argument has been set
- * to CONTAINER_TERMINATED.
- * 0 : The container is being rebooted, has been shut down or exited
- * successfully. The container argument has been set to either
- * CONTAINER_TERMINATED or CONTAINER_REBOOTED.
- *
- * That is, success is indicated by a return value of zero, and an
- * error is indicated by a non-zero value.
- */
-static int wait_for_container(pid_t pid, ContainerStatus *container) {
- siginfo_t status;
- int r;
-
- r = wait_for_terminate(pid, &status);
- if (r < 0)
- return log_warning_errno(r, "Failed to wait for container: %m");
-
- switch (status.si_code) {
-
- case CLD_EXITED:
- if (status.si_status == 0) {
- log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s exited successfully.", arg_machine);
-
- } else
- log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s failed with error code %i.", arg_machine, status.si_status);
-
- *container = CONTAINER_TERMINATED;
- return status.si_status;
-
- case CLD_KILLED:
- if (status.si_status == SIGINT) {
-
- log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s has been shut down.", arg_machine);
- *container = CONTAINER_TERMINATED;
- return 0;
-
- } else if (status.si_status == SIGHUP) {
-
- log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s is being rebooted.", arg_machine);
- *container = CONTAINER_REBOOTED;
- return 0;
- }
-
- /* CLD_KILLED fallthrough */
-
- case CLD_DUMPED:
- log_error("Container %s terminated by signal %s.", arg_machine, signal_to_string(status.si_status));
- return -EIO;
-
- default:
- log_error("Container %s failed due to unknown reason.", arg_machine);
- return -EIO;
- }
-
- return r;
-}
-
-static void nop_handler(int sig) {}
-
-static int on_orderly_shutdown(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
- pid_t pid;
-
- pid = PTR_TO_UINT32(userdata);
- if (pid > 0) {
- if (kill(pid, arg_kill_signal) >= 0) {
- log_info("Trying to halt container. Send SIGTERM again to trigger immediate termination.");
- sd_event_source_set_userdata(s, NULL);
- return 0;
- }
- }
-
- sd_event_exit(sd_event_source_get_event(s), 0);
- return 0;
-}
-
-static int determine_names(void) {
- int r;
-
- if (!arg_image && !arg_directory) {
- if (arg_machine) {
- _cleanup_(image_unrefp) Image *i = NULL;
-
- r = image_find(arg_machine, &i);
- if (r < 0)
- return log_error_errno(r, "Failed to find image for machine '%s': %m", arg_machine);
- else if (r == 0) {
- log_error("No image for machine '%s': %m", arg_machine);
- return -ENOENT;
- }
-
- if (i->type == IMAGE_RAW)
- r = set_sanitized_path(&arg_image, i->path);
- else
- r = set_sanitized_path(&arg_directory, i->path);
- if (r < 0)
- return log_error_errno(r, "Invalid image directory: %m");
-
- arg_read_only = arg_read_only || i->read_only;
- } else
- arg_directory = get_current_dir_name();
-
- if (!arg_directory && !arg_machine) {
- log_error("Failed to determine path, please use -D or -i.");
- return -EINVAL;
- }
- }
-
- if (!arg_machine) {
- if (arg_directory && path_equal(arg_directory, "/"))
- arg_machine = gethostname_malloc();
- else
- arg_machine = strdup(basename(arg_image ?: arg_directory));
-
- if (!arg_machine)
- return log_oom();
-
- hostname_cleanup(arg_machine, false);
- if (!machine_name_is_valid(arg_machine)) {
- log_error("Failed to determine machine name automatically, please use -M.");
- return -EINVAL;
- }
-
- if (arg_ephemeral) {
- char *b;
-
- /* Add a random suffix when this is an
- * ephemeral machine, so that we can run many
- * instances at once without manually having
- * to specify -M each time. */
-
- if (asprintf(&b, "%s-%016" PRIx64, arg_machine, random_u64()) < 0)
- return log_oom();
-
- free(arg_machine);
- arg_machine = b;
- }
- }
-
- return 0;
-}
-
-static int determine_uid_shift(void) {
- int r;
-
- if (!arg_userns)
- return 0;
-
- if (arg_uid_shift == UID_INVALID) {
- struct stat st;
-
- r = stat(arg_directory, &st);
- if (r < 0)
- return log_error_errno(errno, "Failed to determine UID base of %s: %m", arg_directory);
-
- arg_uid_shift = st.st_uid & UINT32_C(0xffff0000);
-
- if (arg_uid_shift != (st.st_gid & UINT32_C(0xffff0000))) {
- log_error("UID and GID base of %s don't match.", arg_directory);
- return -EINVAL;
- }
-
- arg_uid_range = UINT32_C(0x10000);
- }
-
- if (arg_uid_shift > (uid_t) -1 - arg_uid_range) {
- log_error("UID base too high for UID range.");
- return -EINVAL;
- }
-
- log_info("Using user namespaces with base " UID_FMT " and range " UID_FMT ".", arg_uid_shift, arg_uid_range);
- return 0;
-}
-
-int main(int argc, char *argv[]) {
-
- _cleanup_free_ char *device_path = NULL, *root_device = NULL, *home_device = NULL, *srv_device = NULL, *console = NULL;
- bool root_device_rw = true, home_device_rw = true, srv_device_rw = true;
- _cleanup_close_ int master = -1, image_fd = -1;
- _cleanup_fdset_free_ FDSet *fds = NULL;
- int r, n_fd_passed, loop_nr = -1;
- char veth_name[IFNAMSIZ];
- bool secondary = false, remove_subvol = false;
- sigset_t mask, mask_chld;
- pid_t pid = 0;
- int ret = EXIT_SUCCESS;
- union in_addr_union exposed = {};
- _cleanup_release_lock_file_ LockFile tree_global_lock = LOCK_FILE_INIT, tree_local_lock = LOCK_FILE_INIT;
- bool interactive;
-
- log_parse_environment();
- log_open();
-
- r = parse_argv(argc, argv);
- if (r <= 0)
- goto finish;
-
- r = determine_names();
- if (r < 0)
- goto finish;
-
- if (geteuid() != 0) {
- log_error("Need to be root.");
- r = -EPERM;
- goto finish;
- }
-
- log_close();
- n_fd_passed = sd_listen_fds(false);
- if (n_fd_passed > 0) {
- r = fdset_new_listen_fds(&fds, false);
- if (r < 0) {
- log_error_errno(r, "Failed to collect file descriptors: %m");
- goto finish;
- }
- }
- fdset_close_others(fds);
- log_open();
-
- if (arg_directory) {
- assert(!arg_image);
-
- if (path_equal(arg_directory, "/") && !arg_ephemeral) {
- log_error("Spawning container on root directory is not supported. Consider using --ephemeral.");
- r = -EINVAL;
- goto finish;
- }
-
- if (arg_ephemeral) {
- _cleanup_free_ char *np = NULL;
-
- /* If the specified path is a mount point we
- * generate the new snapshot immediately
- * inside it under a random name. However if
- * the specified is not a mount point we
- * create the new snapshot in the parent
- * directory, just next to it. */
- r = path_is_mount_point(arg_directory, false);
- if (r < 0) {
- log_error_errno(r, "Failed to determine whether directory %s is mount point: %m", arg_directory);
- goto finish;
- }
- if (r > 0)
- r = tempfn_random_child(arg_directory, &np);
- else
- r = tempfn_random(arg_directory, &np);
- if (r < 0) {
- log_error_errno(r, "Failed to generate name for snapshot: %m");
- goto finish;
- }
-
- r = image_path_lock(np, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
- if (r < 0) {
- log_error_errno(r, "Failed to lock %s: %m", np);
- goto finish;
- }
-
- r = btrfs_subvol_snapshot(arg_directory, np, arg_read_only, true);
- if (r < 0) {
- log_error_errno(r, "Failed to create snapshot %s from %s: %m", np, arg_directory);
- goto finish;
- }
-
- free(arg_directory);
- arg_directory = np;
- np = NULL;
-
- remove_subvol = true;
-
- } else {
- r = image_path_lock(arg_directory, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
- if (r == -EBUSY) {
- log_error_errno(r, "Directory tree %s is currently busy.", arg_directory);
- goto finish;
- }
- if (r < 0) {
- log_error_errno(r, "Failed to lock %s: %m", arg_directory);
- return r;
- }
-
- if (arg_template) {
- r = btrfs_subvol_snapshot(arg_template, arg_directory, arg_read_only, true);
- if (r == -EEXIST) {
- if (!arg_quiet)
- log_info("Directory %s already exists, not populating from template %s.", arg_directory, arg_template);
- } else if (r < 0) {
- log_error_errno(r, "Couldn't create snapshot %s from %s: %m", arg_directory, arg_template);
- goto finish;
- } else {
- if (!arg_quiet)
- log_info("Populated %s from template %s.", arg_directory, arg_template);
- }
- }
- }
-
- if (arg_boot) {
- if (path_is_os_tree(arg_directory) <= 0) {
- log_error("Directory %s doesn't look like an OS root directory (os-release file is missing). Refusing.", arg_directory);
- r = -EINVAL;
- goto finish;
- }
- } else {
- const char *p;
-
- p = strjoina(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);
- r = -EINVAL;
- goto finish;
- }
- }
-
- } else {
- char template[] = "/tmp/nspawn-root-XXXXXX";
-
- assert(arg_image);
- assert(!arg_template);
-
- r = image_path_lock(arg_image, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
- if (r == -EBUSY) {
- r = log_error_errno(r, "Disk image %s is currently busy.", arg_image);
- goto finish;
- }
- if (r < 0) {
- r = log_error_errno(r, "Failed to create image lock: %m");
- goto finish;
- }
-
- if (!mkdtemp(template)) {
- log_error_errno(errno, "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;
- }
-
- r = determine_uid_shift();
- if (r < 0)
- goto finish;
-
- interactive = isatty(STDIN_FILENO) > 0 && isatty(STDOUT_FILENO) > 0;
-
- master = posix_openpt(O_RDWR|O_NOCTTY|O_CLOEXEC|O_NDELAY);
- if (master < 0) {
- r = log_error_errno(errno, "Failed to acquire pseudo tty: %m");
- goto finish;
- }
-
- r = ptsname_malloc(master, &console);
- if (r < 0) {
- r = log_error_errno(r, "Failed to determine tty name: %m");
- goto finish;
- }
-
- if (unlockpt(master) < 0) {
- r = log_error_errno(errno, "Failed to unlock tty: %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_directory);
-
- assert_se(sigemptyset(&mask) == 0);
- sigset_add_many(&mask, SIGCHLD, SIGWINCH, SIGTERM, SIGINT, -1);
- assert_se(sigprocmask(SIG_BLOCK, &mask, NULL) == 0);
-
- assert_se(sigemptyset(&mask_chld) == 0);
- assert_se(sigaddset(&mask_chld, SIGCHLD) == 0);
-
- for (;;) {
- _cleanup_close_pair_ int kmsg_socket_pair[2] = { -1, -1 }, rtnl_socket_pair[2] = { -1, -1 };
- ContainerStatus container_status;
- _cleanup_(barrier_destroy) Barrier barrier = BARRIER_NULL;
- struct sigaction sa = {
- .sa_handler = nop_handler,
- .sa_flags = SA_NOCLDSTOP,
- };
-
- r = barrier_create(&barrier);
- if (r < 0) {
- log_error_errno(r, "Cannot initialize IPC barrier: %m");
- goto finish;
- }
-
- if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, kmsg_socket_pair) < 0) {
- r = log_error_errno(errno, "Failed to create kmsg socket pair: %m");
- goto finish;
- }
-
- if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, rtnl_socket_pair) < 0) {
- r = log_error_errno(errno, "Failed to create rtnl socket pair: %m");
- goto finish;
- }
-
- /* Child can be killed before execv(), so handle SIGCHLD
- * in order to interrupt parent's blocking calls and
- * give it a chance to call wait() and terminate. */
- r = sigprocmask(SIG_UNBLOCK, &mask_chld, NULL);
- if (r < 0) {
- r = log_error_errno(errno, "Failed to change the signal mask: %m");
- goto finish;
- }
-
- r = sigaction(SIGCHLD, &sa, NULL);
- if (r < 0) {
- r = log_error_errno(errno, "Failed to install SIGCHLD handler: %m");
- goto finish;
- }
-
- pid = raw_clone(SIGCHLD|CLONE_NEWNS|
- (arg_share_system ? 0 : CLONE_NEWIPC|CLONE_NEWPID|CLONE_NEWUTS)|
- (arg_private_network ? CLONE_NEWNET : 0), NULL);
- if (pid < 0) {
- if (errno == EINVAL)
- r = log_error_errno(errno, "clone() failed, do you have namespace support enabled in your kernel? (You need UTS, IPC, PID and NET namespacing built in): %m");
- else
- r = log_error_errno(errno, "clone() failed: %m");
-
- 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;
-
- barrier_set_role(&barrier, BARRIER_CHILD);
-
- envp[n_env] = strv_find_prefix(environ, "TERM=");
- if (envp[n_env])
- n_env ++;
-
- master = safe_close(master);
-
- kmsg_socket_pair[0] = safe_close(kmsg_socket_pair[0]);
- rtnl_socket_pair[0] = safe_close(rtnl_socket_pair[0]);
-
- reset_all_signal_handlers();
- reset_signal_mask();
-
- if (interactive) {
- close_nointr(STDIN_FILENO);
- close_nointr(STDOUT_FILENO);
- close_nointr(STDERR_FILENO);
-
- r = open_terminal(console, O_RDWR);
- if (r != STDIN_FILENO) {
- if (r >= 0) {
- safe_close(r);
- r = -EINVAL;
- }
-
- log_error_errno(r, "Failed to open console: %m");
- _exit(EXIT_FAILURE);
- }
-
- if (dup2(STDIN_FILENO, STDOUT_FILENO) != STDOUT_FILENO ||
- dup2(STDIN_FILENO, STDERR_FILENO) != STDERR_FILENO) {
- log_error_errno(errno, "Failed to duplicate console: %m");
- _exit(EXIT_FAILURE);
- }
- }
-
- if (setsid() < 0) {
- log_error_errno(errno, "setsid() failed: %m");
- _exit(EXIT_FAILURE);
- }
-
- if (reset_audit_loginuid() < 0)
- _exit(EXIT_FAILURE);
-
- if (prctl(PR_SET_PDEATHSIG, SIGKILL) < 0) {
- log_error_errno(errno, "PR_SET_PDEATHSIG failed: %m");
- _exit(EXIT_FAILURE);
- }
-
- if (arg_private_network)
- loopback_setup();
-
- /* Mark everything as slave, so that we still
- * receive mounts from the real root, but don't
- * propagate mounts to the real root. */
- if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL) < 0) {
- log_error_errno(errno, "MS_SLAVE|MS_REC failed: %m");
- _exit(EXIT_FAILURE);
- }
-
- if (mount_devices(arg_directory,
- root_device, root_device_rw,
- home_device, home_device_rw,
- srv_device, srv_device_rw) < 0)
- _exit(EXIT_FAILURE);
-
- /* Turn directory into bind mount */
- if (mount(arg_directory, arg_directory, NULL, MS_BIND|MS_REC, NULL) < 0) {
- log_error_errno(errno, "Failed to make bind mount: %m");
- _exit(EXIT_FAILURE);
- }
-
- r = setup_volatile(arg_directory);
- if (r < 0)
- _exit(EXIT_FAILURE);
-
- if (setup_volatile_state(arg_directory) < 0)
- _exit(EXIT_FAILURE);
-
- r = base_filesystem_create(arg_directory);
- if (r < 0)
- _exit(EXIT_FAILURE);
-
- if (arg_read_only) {
- r = bind_remount_recursive(arg_directory, true);
- if (r < 0) {
- log_error_errno(r, "Failed to make tree read-only: %m");
- _exit(EXIT_FAILURE);
- }
- }
-
- if (mount_all(arg_directory) < 0)
- _exit(EXIT_FAILURE);
-
- if (copy_devnodes(arg_directory) < 0)
- _exit(EXIT_FAILURE);
-
- if (setup_ptmx(arg_directory) < 0)
- _exit(EXIT_FAILURE);
-
- dev_setup(arg_directory);
-
- if (setup_propagate(arg_directory) < 0)
- _exit(EXIT_FAILURE);
-
- if (setup_seccomp() < 0)
- _exit(EXIT_FAILURE);
-
- if (setup_dev_console(arg_directory, console) < 0)
- _exit(EXIT_FAILURE);
-
- if (setup_kmsg(arg_directory, kmsg_socket_pair[1]) < 0)
- _exit(EXIT_FAILURE);
- kmsg_socket_pair[1] = safe_close(kmsg_socket_pair[1]);
-
- if (send_rtnl(rtnl_socket_pair[1]) < 0)
- _exit(EXIT_FAILURE);
- rtnl_socket_pair[1] = safe_close(rtnl_socket_pair[1]);
-
- /* Tell the parent that we are ready, and that
- * it can cgroupify us to that we lack access
- * to certain devices and resources. */
- (void) barrier_place(&barrier); /* #1 */
-
- if (setup_boot_id(arg_directory) < 0)
- _exit(EXIT_FAILURE);
-
- if (setup_timezone(arg_directory) < 0)
- _exit(EXIT_FAILURE);
-
- if (setup_resolv_conf(arg_directory) < 0)
- _exit(EXIT_FAILURE);
-
- if (setup_journal(arg_directory) < 0)
- _exit(EXIT_FAILURE);
-
- if (mount_binds(arg_directory, arg_bind, false) < 0)
- _exit(EXIT_FAILURE);
-
- if (mount_binds(arg_directory, arg_bind_ro, true) < 0)
- _exit(EXIT_FAILURE);
-
- if (mount_tmpfs(arg_directory) < 0)
- _exit(EXIT_FAILURE);
-
- /* Wait until we are cgroup-ified, so that we
- * can mount the right cgroup path writable */
- (void) barrier_place_and_sync(&barrier); /* #2 */
-
- if (mount_cgroup(arg_directory) < 0)
- _exit(EXIT_FAILURE);
-
- if (chdir(arg_directory) < 0) {
- log_error_errno(errno, "chdir(%s) failed: %m", arg_directory);
- _exit(EXIT_FAILURE);
- }
-
- if (mount(arg_directory, "/", NULL, MS_MOVE, NULL) < 0) {
- log_error_errno(errno, "mount(MS_MOVE) failed: %m");
- _exit(EXIT_FAILURE);
- }
-
- if (chroot(".") < 0) {
- log_error_errno(errno, "chroot() failed: %m");
- _exit(EXIT_FAILURE);
- }
-
- if (chdir("/") < 0) {
- log_error_errno(errno, "chdir() failed: %m");
- _exit(EXIT_FAILURE);
- }
-
- if (arg_userns) {
- if (unshare(CLONE_NEWUSER) < 0) {
- log_error_errno(errno, "unshare(CLONE_NEWUSER) failed: %m");
- _exit(EXIT_FAILURE);
- }
-
- /* Tell the parent, that it now can
- * write the UID map. */
- (void) barrier_place(&barrier); /* #3 */
-
- /* Wait until the parent wrote the UID
- * map */
- (void) barrier_place_and_sync(&barrier); /* #4 */
- }
-
- umask(0022);
-
- if (drop_capabilities() < 0) {
- log_error_errno(errno, "drop_capabilities() failed: %m");
- _exit(EXIT_FAILURE);
- }
-
- setup_hostname();
-
- if (arg_personality != 0xffffffffLU) {
- if (personality(arg_personality) < 0) {
- log_error_errno(errno, "personality() failed: %m");
- _exit(EXIT_FAILURE);
- }
- } else if (secondary) {
- if (personality(PER_LINUX32) < 0) {
- log_error_errno(errno, "personality() failed: %m");
- _exit(EXIT_FAILURE);
- }
- }
-
-#ifdef HAVE_SELINUX
- if (arg_selinux_context)
- if (setexeccon((security_context_t) arg_selinux_context) < 0) {
- log_error_errno(errno, "setexeccon(\"%s\") failed: %m", arg_selinux_context);
- _exit(EXIT_FAILURE);
- }
-#endif
-
- r = change_uid_gid(&home);
- if (r < 0)
- _exit(EXIT_FAILURE);
-
- if ((asprintf((char**)(envp + n_env++), "HOME=%s", home ? home: "/root") < 0) ||
- (asprintf((char**)(envp + n_env++), "USER=%s", arg_user ? arg_user : "root") < 0) ||
- (asprintf((char**)(envp + n_env++), "LOGNAME=%s", arg_user ? arg_user : "root") < 0)) {
- log_oom();
- _exit(EXIT_FAILURE);
- }
-
- if (!sd_id128_equal(arg_uuid, SD_ID128_NULL)) {
- char as_uuid[37];
-
- if (asprintf((char**)(envp + n_env++), "container_uuid=%s", id128_format_as_uuid(arg_uuid, as_uuid)) < 0) {
- log_oom();
- _exit(EXIT_FAILURE);
- }
- }
-
- if (fdset_size(fds) > 0) {
- r = fdset_cloexec(fds, false);
- if (r < 0) {
- log_error_errno(r, "Failed to unset O_CLOEXEC for file descriptors.");
- _exit(EXIT_FAILURE);
- }
-
- if ((asprintf((char **)(envp + n_env++), "LISTEN_FDS=%u", n_fd_passed) < 0) ||
- (asprintf((char **)(envp + n_env++), "LISTEN_PID=1") < 0)) {
- log_oom();
- _exit(EXIT_FAILURE);
- }
- }
-
- if (!strv_isempty(arg_setenv)) {
- char **n;
-
- n = strv_env_merge(2, envp, arg_setenv);
- if (!n) {
- log_oom();
- _exit(EXIT_FAILURE);
- }
-
- env_use = n;
- } else
- env_use = (char**) envp;
-
- /* Let the parent know that we are ready and
- * wait until the parent is ready with the
- * setup, too... */
- (void) barrier_place_and_sync(&barrier); /* #5 */
-
- if (arg_boot) {
- char **a;
- size_t l;
-
- /* Automatically search for the init system */
-
- l = 1 + argc - optind;
- a = newa(char*, l + 1);
- memcpy(a + 1, argv + optind, l * sizeof(char*));
-
- a[0] = (char*) "/usr/lib/systemd/systemd";
- execve(a[0], a, env_use);
-
- a[0] = (char*) "/lib/systemd/systemd";
- execve(a[0], a, env_use);
-
- a[0] = (char*) "/sbin/init";
- execve(a[0], a, env_use);
- } else if (argc > optind)
- execvpe(argv[optind], argv + optind, env_use);
- else {
- chdir(home ? home : "/root");
- execle("/bin/bash", "-bash", NULL, env_use);
- execle("/bin/sh", "-sh", NULL, env_use);
- }
-
- log_error_errno(errno, "execv() failed: %m");
- _exit(EXIT_FAILURE);
- }
-
- barrier_set_role(&barrier, BARRIER_PARENT);
- fdset_free(fds);
- fds = NULL;
-
- kmsg_socket_pair[1] = safe_close(kmsg_socket_pair[1]);
- rtnl_socket_pair[1] = safe_close(rtnl_socket_pair[1]);
-
- (void) barrier_place(&barrier); /* #1 */
-
- /* Wait for the most basic Child-setup to be done,
- * before we add hardware to it, and place it in a
- * cgroup. */
- if (barrier_sync(&barrier)) { /* #1 */
- int ifi = 0;
-
- r = move_network_interfaces(pid);
- if (r < 0)
- goto finish;
-
- r = setup_veth(pid, veth_name, &ifi);
- if (r < 0)
- goto finish;
-
- r = setup_bridge(veth_name, &ifi);
- if (r < 0)
- goto finish;
-
- r = setup_macvlan(pid);
- if (r < 0)
- goto finish;
-
- r = setup_ipvlan(pid);
- if (r < 0)
- goto finish;
-
- r = register_machine(pid, ifi);
- if (r < 0)
- goto finish;
-
- /* Notify the child that the parent is ready with all
- * its setup, and that the child can now hand over
- * control to the code to run inside the container. */
- (void) barrier_place(&barrier); /* #2 */
-
- if (arg_userns) {
- char uid_map[strlen("/proc//uid_map") + DECIMAL_STR_MAX(uid_t) + 1], line[DECIMAL_STR_MAX(uid_t)*3+3+1];
-
- (void) barrier_place_and_sync(&barrier); /* #3 */
-
- xsprintf(uid_map, "/proc/" PID_FMT "/uid_map", pid);
- xsprintf(line, UID_FMT " " UID_FMT " " UID_FMT "\n", 0, arg_uid_shift, arg_uid_range);
- r = write_string_file(uid_map, line);
- if (r < 0) {
- log_error_errno(r, "Failed to write UID map: %m");
- goto finish;
- }
-
- /* We always assign the same UID and GID ranges */
- xsprintf(uid_map, "/proc/" PID_FMT "/gid_map", pid);
- r = write_string_file(uid_map, line);
- if (r < 0) {
- log_error_errno(r, "Failed to write GID map: %m");
- goto finish;
- }
-
- (void) barrier_place(&barrier); /* #4 */
- }
-
- /* Block SIGCHLD here, before notifying child.
- * process_pty() will handle it with the other signals. */
- r = sigprocmask(SIG_BLOCK, &mask_chld, NULL);
- if (r < 0)
- goto finish;
-
- /* Reset signal to default */
- r = default_signals(SIGCHLD, -1);
- if (r < 0)
- goto finish;
-
- /* Let the child know that we are ready and wait that the child is completely ready now. */
- if (barrier_place_and_sync(&barrier)) { /* #5 */
- _cleanup_event_unref_ sd_event *event = NULL;
- _cleanup_(pty_forward_freep) PTYForward *forward = NULL;
- _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
- char last_char = 0;
-
- sd_notifyf(false,
- "READY=1\n"
- "STATUS=Container running.\n"
- "X_NSPAWN_LEADER_PID=" PID_FMT, pid);
-
- r = sd_event_new(&event);
- if (r < 0) {
- log_error_errno(r, "Failed to get default event source: %m");
- goto finish;
- }
-
- if (arg_kill_signal > 0) {
- /* Try to kill the init system on SIGINT or SIGTERM */
- sd_event_add_signal(event, NULL, SIGINT, on_orderly_shutdown, UINT32_TO_PTR(pid));
- sd_event_add_signal(event, NULL, SIGTERM, on_orderly_shutdown, UINT32_TO_PTR(pid));
- } else {
- /* Immediately exit */
- sd_event_add_signal(event, NULL, SIGINT, NULL, NULL);
- sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL);
- }
-
- /* simply exit on sigchld */
- sd_event_add_signal(event, NULL, SIGCHLD, NULL, NULL);
-
- if (arg_expose_ports) {
- r = watch_rtnl(event, rtnl_socket_pair[0], &exposed, &rtnl);
- if (r < 0)
- goto finish;
-
- (void) expose_ports(rtnl, &exposed);
- }
-
- rtnl_socket_pair[0] = safe_close(rtnl_socket_pair[0]);
-
- r = pty_forward_new(event, master, true, !interactive, &forward);
- if (r < 0) {
- log_error_errno(r, "Failed to create PTY forwarder: %m");
- goto finish;
- }
-
- r = sd_event_loop(event);
- if (r < 0) {
- log_error_errno(r, "Failed to run event loop: %m");
- goto finish;
- }
-
- pty_forward_get_last_char(forward, &last_char);
-
- forward = pty_forward_free(forward);
-
- if (!arg_quiet && last_char != '\n')
- putc('\n', stdout);
-
- /* Kill if it is not dead yet anyway */
- terminate_machine(pid);
- }
- }
-
- /* Normally redundant, but better safe than sorry */
- kill(pid, SIGKILL);
-
- r = wait_for_container(pid, &container_status);
- pid = 0;
-
- if (r < 0)
- /* We failed to wait for the container, or the
- * container exited abnormally */
- goto finish;
- else if (r > 0 || container_status == CONTAINER_TERMINATED){
- /* The container exited with a non-zero
- * status, or with zero status and no reboot
- * was requested. */
- ret = r;
- break;
- }
-
- /* CONTAINER_REBOOTED, loop again */
-
- if (arg_keep_unit) {
- /* Special handling if we are running as a
- * service: instead of simply restarting the
- * machine we want to restart the entire
- * service, so let's inform systemd about this
- * with the special exit code 133. The service
- * file uses RestartForceExitStatus=133 so
- * that this results in a full nspawn
- * restart. This is necessary since we might
- * have cgroup parameters set we want to have
- * flushed out. */
- ret = 133;
- r = 0;
- break;
- }
-
- flush_ports(&exposed);
- }
-
-finish:
- sd_notify(false,
- "STOPPING=1\n"
- "STATUS=Terminating...");
-
- loop_remove(loop_nr, &image_fd);
-
- if (pid > 0)
- kill(pid, SIGKILL);
-
- if (remove_subvol && arg_directory) {
- int k;
-
- k = btrfs_subvol_remove(arg_directory);
- if (k < 0)
- log_warning_errno(k, "Cannot remove subvolume '%s', ignoring: %m", arg_directory);
- }
-
- if (arg_machine) {
- const char *p;
-
- p = strjoina("/run/systemd/nspawn/propagate/", arg_machine);
- (void) rm_rf(p, false, true, false);
- }
-
- free(arg_directory);
- free(arg_template);
- free(arg_image);
- free(arg_machine);
- free(arg_user);
- strv_free(arg_setenv);
- strv_free(arg_network_interfaces);
- strv_free(arg_network_macvlan);
- strv_free(arg_network_ipvlan);
- strv_free(arg_bind);
- strv_free(arg_bind_ro);
- strv_free(arg_tmpfs);
-
- flush_ports(&exposed);
-
- while (arg_expose_ports) {
- ExposePort *p = arg_expose_ports;
- LIST_REMOVE(ports, arg_expose_ports, p);
- free(p);
- }
-
- return r < 0 ? EXIT_FAILURE : ret;
-}
~ianmdlvl / elogind.git / commitdiff