diff options
Diffstat (limited to 'src/nspawn/nspawn.c')
| -rw-r--r-- | src/nspawn/nspawn.c | 4495 |
1 files changed, 0 insertions, 4495 deletions
diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c deleted file mode 100644 index 7e56cf2056..0000000000 --- a/src/nspawn/nspawn.c +++ /dev/null @@ -1,4495 +0,0 @@ -/*-*- 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; -} |