e9642be2cc
And make use of it where appropriate for executing services and for nspawn.
2133 lines
75 KiB
C
2133 lines
75 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <signal.h>
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#include <sched.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/syscall.h>
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#include <sys/mount.h>
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#include <sys/wait.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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#include <sys/prctl.h>
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#include <sys/capability.h>
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#include <getopt.h>
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#include <termios.h>
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#include <sys/signalfd.h>
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#include <grp.h>
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#include <linux/fs.h>
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#include <sys/un.h>
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#include <sys/socket.h>
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#include <linux/netlink.h>
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#include <sys/eventfd.h>
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#include <net/if.h>
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#include <linux/veth.h>
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#ifdef HAVE_SELINUX
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#include <selinux/selinux.h>
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#endif
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#ifdef HAVE_SECCOMP
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#include <seccomp.h>
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#endif
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#include "sd-daemon.h"
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#include "sd-bus.h"
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#include "sd-id128.h"
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#include "sd-rtnl.h"
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#include "log.h"
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#include "util.h"
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#include "mkdir.h"
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#include "macro.h"
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#include "audit.h"
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#include "missing.h"
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#include "cgroup-util.h"
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#include "strv.h"
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#include "path-util.h"
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#include "loopback-setup.h"
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#include "dev-setup.h"
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#include "fdset.h"
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#include "build.h"
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#include "fileio.h"
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#include "bus-util.h"
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#include "bus-error.h"
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#include "ptyfwd.h"
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#include "bus-kernel.h"
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#include "env-util.h"
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#include "def.h"
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#include "rtnl-util.h"
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#include "udev-util.h"
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#ifdef HAVE_SECCOMP
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#include "seccomp-util.h"
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#endif
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typedef enum LinkJournal {
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LINK_NO,
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LINK_AUTO,
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LINK_HOST,
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LINK_GUEST
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} LinkJournal;
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static char *arg_directory = NULL;
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static char *arg_user = NULL;
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static sd_id128_t arg_uuid = {};
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static char *arg_machine = NULL;
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static char *arg_selinux_context = NULL;
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static char *arg_selinux_apifs_context = NULL;
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static const char *arg_slice = NULL;
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static bool arg_private_network = false;
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static bool arg_read_only = false;
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static bool arg_boot = false;
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static LinkJournal arg_link_journal = LINK_AUTO;
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static uint64_t arg_retain =
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(1ULL << CAP_CHOWN) |
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(1ULL << CAP_DAC_OVERRIDE) |
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(1ULL << CAP_DAC_READ_SEARCH) |
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(1ULL << CAP_FOWNER) |
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(1ULL << CAP_FSETID) |
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(1ULL << CAP_IPC_OWNER) |
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(1ULL << CAP_KILL) |
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(1ULL << CAP_LEASE) |
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(1ULL << CAP_LINUX_IMMUTABLE) |
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(1ULL << CAP_NET_BIND_SERVICE) |
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(1ULL << CAP_NET_BROADCAST) |
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(1ULL << CAP_NET_RAW) |
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(1ULL << CAP_SETGID) |
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(1ULL << CAP_SETFCAP) |
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(1ULL << CAP_SETPCAP) |
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(1ULL << CAP_SETUID) |
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(1ULL << CAP_SYS_ADMIN) |
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(1ULL << CAP_SYS_CHROOT) |
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(1ULL << CAP_SYS_NICE) |
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(1ULL << CAP_SYS_PTRACE) |
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(1ULL << CAP_SYS_TTY_CONFIG) |
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(1ULL << CAP_SYS_RESOURCE) |
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(1ULL << CAP_SYS_BOOT) |
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(1ULL << CAP_AUDIT_WRITE) |
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(1ULL << CAP_AUDIT_CONTROL) |
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(1ULL << CAP_MKNOD);
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static char **arg_bind = NULL;
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static char **arg_bind_ro = NULL;
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static char **arg_setenv = NULL;
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static bool arg_quiet = false;
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static bool arg_share_system = false;
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static bool arg_register = true;
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static bool arg_keep_unit = false;
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static char **arg_network_interfaces = NULL;
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static bool arg_network_veth = false;
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static char *arg_network_bridge = NULL;
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static int help(void) {
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printf("%s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n"
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"Spawn a minimal namespace container for debugging, testing and building.\n\n"
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" -h --help Show this help\n"
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" --version Print version string\n"
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" -q --quiet Do not show status information\n"
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" -D --directory=NAME Root directory for the container\n"
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" -b --boot Boot up full system (i.e. invoke init)\n"
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" -u --user=USER Run the command under specified user or uid\n"
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" -M --machine=NAME Set the machine name for the container\n"
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" --uuid=UUID Set a specific machine UUID for the container\n"
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" -S --slice=SLICE Place the container in the specified slice\n"
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" --private-network Disable network in container\n"
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" --network-interface=INTERFACE\n"
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" Assign an existing network interface to the\n"
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" container\n"
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" --network-veth Add a virtual ethernet connection between host\n"
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" and container\n"
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" --network-bridge=INTERFACE\n"
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" Add a virtual ethernet connection between host\n"
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" and container and add it to an existing bridge on\n"
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" the host\n"
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" -Z --selinux-context=SECLABEL\n"
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" Set the SELinux security context to be used by\n"
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" processes in the container\n"
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" -L --selinux-apifs-context=SECLABEL\n"
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" Set the SELinux security context to be used by\n"
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" API/tmpfs file systems in the container\n"
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" --capability=CAP In addition to the default, retain specified\n"
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" capability\n"
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" --drop-capability=CAP Drop the specified capability from the default set\n"
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" --link-journal=MODE Link up guest journal, one of no, auto, guest, host\n"
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" -j Equivalent to --link-journal=host\n"
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" --read-only Mount the root directory read-only\n"
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" --bind=PATH[:PATH] Bind mount a file or directory from the host into\n"
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" the container\n"
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" --bind-ro=PATH[:PATH] Similar, but creates a read-only bind mount\n"
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" --setenv=NAME=VALUE Pass an environment variable to PID 1\n"
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" --share-system Share system namespaces with host\n"
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" --register=BOOLEAN Register container as machine\n"
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" --keep-unit Do not register a scope for the machine, reuse\n"
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" the service unit nspawn is running in\n",
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program_invocation_short_name);
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return 0;
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_VERSION = 0x100,
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ARG_PRIVATE_NETWORK,
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ARG_UUID,
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ARG_READ_ONLY,
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ARG_CAPABILITY,
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ARG_DROP_CAPABILITY,
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ARG_LINK_JOURNAL,
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ARG_BIND,
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ARG_BIND_RO,
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ARG_SETENV,
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ARG_SHARE_SYSTEM,
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ARG_REGISTER,
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ARG_KEEP_UNIT,
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ARG_NETWORK_INTERFACE,
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ARG_NETWORK_VETH,
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ARG_NETWORK_BRIDGE,
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, ARG_VERSION },
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{ "directory", required_argument, NULL, 'D' },
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{ "user", required_argument, NULL, 'u' },
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{ "private-network", no_argument, NULL, ARG_PRIVATE_NETWORK },
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{ "boot", no_argument, NULL, 'b' },
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{ "uuid", required_argument, NULL, ARG_UUID },
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{ "read-only", no_argument, NULL, ARG_READ_ONLY },
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{ "capability", required_argument, NULL, ARG_CAPABILITY },
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{ "drop-capability", required_argument, NULL, ARG_DROP_CAPABILITY },
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{ "link-journal", required_argument, NULL, ARG_LINK_JOURNAL },
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{ "bind", required_argument, NULL, ARG_BIND },
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{ "bind-ro", required_argument, NULL, ARG_BIND_RO },
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{ "machine", required_argument, NULL, 'M' },
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{ "slice", required_argument, NULL, 'S' },
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{ "setenv", required_argument, NULL, ARG_SETENV },
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{ "selinux-context", required_argument, NULL, 'Z' },
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{ "selinux-apifs-context", required_argument, NULL, 'L' },
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{ "quiet", no_argument, NULL, 'q' },
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{ "share-system", no_argument, NULL, ARG_SHARE_SYSTEM },
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{ "register", required_argument, NULL, ARG_REGISTER },
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{ "keep-unit", no_argument, NULL, ARG_KEEP_UNIT },
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{ "network-interface", required_argument, NULL, ARG_NETWORK_INTERFACE },
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{ "network-veth", no_argument, NULL, ARG_NETWORK_VETH },
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{ "network-bridge", required_argument, NULL, ARG_NETWORK_BRIDGE },
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{}
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};
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int c, r;
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uint64_t plus = 0, minus = 0;
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assert(argc >= 0);
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assert(argv);
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while ((c = getopt_long(argc, argv, "+hD:u:bL:M:jS:Z:q", options, NULL)) >= 0) {
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switch (c) {
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case 'h':
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return help();
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case ARG_VERSION:
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puts(PACKAGE_STRING);
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puts(SYSTEMD_FEATURES);
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return 0;
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case 'D':
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free(arg_directory);
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arg_directory = canonicalize_file_name(optarg);
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if (!arg_directory) {
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log_error("Invalid root directory: %m");
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return -ENOMEM;
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}
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break;
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case 'u':
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free(arg_user);
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arg_user = strdup(optarg);
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if (!arg_user)
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return log_oom();
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break;
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case ARG_NETWORK_BRIDGE:
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arg_network_bridge = strdup(optarg);
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if (!arg_network_bridge)
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return log_oom();
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/* fall through */
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case ARG_NETWORK_VETH:
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arg_network_veth = true;
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arg_private_network = true;
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break;
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case ARG_NETWORK_INTERFACE:
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if (strv_push(&arg_network_interfaces, optarg) < 0)
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return log_oom();
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/* fall through */
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case ARG_PRIVATE_NETWORK:
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arg_private_network = true;
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break;
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case 'b':
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arg_boot = true;
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break;
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case ARG_UUID:
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r = sd_id128_from_string(optarg, &arg_uuid);
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if (r < 0) {
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log_error("Invalid UUID: %s", optarg);
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return r;
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}
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break;
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case 'S':
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arg_slice = strdup(optarg);
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if (!arg_slice)
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return log_oom();
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break;
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case 'M':
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if (isempty(optarg)) {
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free(arg_machine);
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arg_machine = NULL;
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} else {
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if (!hostname_is_valid(optarg)) {
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log_error("Invalid machine name: %s", optarg);
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return -EINVAL;
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}
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free(arg_machine);
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arg_machine = strdup(optarg);
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if (!arg_machine)
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return log_oom();
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break;
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}
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case 'Z':
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arg_selinux_context = optarg;
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break;
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case 'L':
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arg_selinux_apifs_context = optarg;
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break;
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case ARG_READ_ONLY:
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arg_read_only = true;
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break;
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case ARG_CAPABILITY:
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case ARG_DROP_CAPABILITY: {
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char *state, *word;
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size_t length;
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FOREACH_WORD_SEPARATOR(word, length, optarg, ",", state) {
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_cleanup_free_ char *t;
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cap_value_t cap;
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t = strndup(word, length);
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if (!t)
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return log_oom();
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if (streq(t, "all")) {
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if (c == ARG_CAPABILITY)
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plus = (uint64_t) -1;
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else
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minus = (uint64_t) -1;
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} else {
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if (cap_from_name(t, &cap) < 0) {
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log_error("Failed to parse capability %s.", t);
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return -EINVAL;
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}
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if (c == ARG_CAPABILITY)
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plus |= 1ULL << (uint64_t) cap;
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else
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minus |= 1ULL << (uint64_t) cap;
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}
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}
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break;
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}
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case 'j':
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arg_link_journal = LINK_GUEST;
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break;
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case ARG_LINK_JOURNAL:
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if (streq(optarg, "auto"))
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arg_link_journal = LINK_AUTO;
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else if (streq(optarg, "no"))
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arg_link_journal = LINK_NO;
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else if (streq(optarg, "guest"))
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arg_link_journal = LINK_GUEST;
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else if (streq(optarg, "host"))
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arg_link_journal = LINK_HOST;
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else {
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log_error("Failed to parse link journal mode %s", optarg);
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return -EINVAL;
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}
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break;
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case ARG_BIND:
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case ARG_BIND_RO: {
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_cleanup_free_ char *a = NULL, *b = NULL;
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char *e;
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char ***x;
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x = c == ARG_BIND ? &arg_bind : &arg_bind_ro;
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e = strchr(optarg, ':');
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if (e) {
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a = strndup(optarg, e - optarg);
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b = strdup(e + 1);
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} else {
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a = strdup(optarg);
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b = strdup(optarg);
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}
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if (!a || !b)
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return log_oom();
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|
|
if (!path_is_absolute(a) || !path_is_absolute(b)) {
|
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log_error("Invalid bind mount specification: %s", optarg);
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return -EINVAL;
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}
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r = strv_extend(x, a);
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if (r < 0)
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return log_oom();
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r = strv_extend(x, b);
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if (r < 0)
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return log_oom();
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break;
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}
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case ARG_SETENV: {
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char **n;
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|
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if (!env_assignment_is_valid(optarg)) {
|
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log_error("Environment variable assignment '%s' is not valid.", optarg);
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return -EINVAL;
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}
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n = strv_env_set(arg_setenv, optarg);
|
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if (!n)
|
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return log_oom();
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|
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strv_free(arg_setenv);
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arg_setenv = n;
|
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break;
|
|
}
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|
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case 'q':
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arg_quiet = true;
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break;
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|
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case ARG_SHARE_SYSTEM:
|
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arg_share_system = true;
|
|
break;
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|
|
|
case ARG_REGISTER:
|
|
r = parse_boolean(optarg);
|
|
if (r < 0) {
|
|
log_error("Failed to parse --register= argument: %s", optarg);
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return r;
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}
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arg_register = r;
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break;
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|
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case ARG_KEEP_UNIT:
|
|
arg_keep_unit = true;
|
|
break;
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|
|
|
case '?':
|
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return -EINVAL;
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|
|
|
default:
|
|
assert_not_reached("Unhandled option");
|
|
}
|
|
}
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|
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if (arg_share_system)
|
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arg_register = false;
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|
|
if (arg_boot && arg_share_system) {
|
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log_error("--boot and --share-system may not be combined.");
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return -EINVAL;
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}
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|
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if (arg_keep_unit && cg_pid_get_owner_uid(0, NULL) >= 0) {
|
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log_error("--keep-unit may not be used when invoked from a user session.");
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return -EINVAL;
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}
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arg_retain = (arg_retain | plus | (arg_private_network ? 1ULL << CAP_NET_ADMIN : 0)) & ~minus;
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return 1;
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}
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|
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static int mount_all(const char *dest) {
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|
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typedef struct MountPoint {
|
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const char *what;
|
|
const char *where;
|
|
const char *type;
|
|
const char *options;
|
|
unsigned long flags;
|
|
bool fatal;
|
|
} MountPoint;
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|
|
|
static const MountPoint mount_table[] = {
|
|
{ "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
|
|
{ "/proc/sys", "/proc/sys", NULL, NULL, MS_BIND, true }, /* Bind mount first */
|
|
{ NULL, "/proc/sys", NULL, NULL, MS_BIND|MS_RDONLY|MS_REMOUNT, true }, /* Then, make it r/o */
|
|
{ "sysfs", "/sys", "sysfs", NULL, MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
|
|
{ "tmpfs", "/dev", "tmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME, true },
|
|
{ "devpts", "/dev/pts", "devpts","newinstance,ptmxmode=0666,mode=620,gid=" STRINGIFY(TTY_GID), MS_NOSUID|MS_NOEXEC, true },
|
|
{ "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true },
|
|
{ "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true },
|
|
#ifdef HAVE_SELINUX
|
|
{ "/sys/fs/selinux", "/sys/fs/selinux", NULL, NULL, MS_BIND, false }, /* Bind mount first */
|
|
{ NULL, "/sys/fs/selinux", NULL, NULL, MS_BIND|MS_RDONLY|MS_REMOUNT, false }, /* Then, make it r/o */
|
|
#endif
|
|
};
|
|
|
|
unsigned k;
|
|
int r = 0;
|
|
|
|
for (k = 0; k < ELEMENTSOF(mount_table); k++) {
|
|
_cleanup_free_ char *where = NULL;
|
|
#ifdef HAVE_SELINUX
|
|
_cleanup_free_ char *options = NULL;
|
|
#endif
|
|
const char *o;
|
|
int t;
|
|
|
|
where = strjoin(dest, "/", mount_table[k].where, NULL);
|
|
if (!where)
|
|
return log_oom();
|
|
|
|
t = path_is_mount_point(where, true);
|
|
if (t < 0) {
|
|
log_error("Failed to detect whether %s is a mount point: %s", where, strerror(-t));
|
|
|
|
if (r == 0)
|
|
r = t;
|
|
|
|
continue;
|
|
}
|
|
|
|
/* Skip this entry if it is not a remount. */
|
|
if (mount_table[k].what && t > 0)
|
|
continue;
|
|
|
|
mkdir_p(where, 0755);
|
|
|
|
#ifdef HAVE_SELINUX
|
|
if (arg_selinux_apifs_context &&
|
|
(streq_ptr(mount_table[k].what, "tmpfs") || streq_ptr(mount_table[k].what, "devpts"))) {
|
|
options = strjoin(mount_table[k].options, ",context=\"", arg_selinux_apifs_context, "\"", NULL);
|
|
if (!options)
|
|
return log_oom();
|
|
|
|
o = options;
|
|
} else
|
|
#endif
|
|
o = mount_table[k].options;
|
|
|
|
|
|
if (mount(mount_table[k].what,
|
|
where,
|
|
mount_table[k].type,
|
|
mount_table[k].flags,
|
|
o) < 0 &&
|
|
mount_table[k].fatal) {
|
|
|
|
log_error("mount(%s) failed: %m", where);
|
|
|
|
if (r == 0)
|
|
r = -errno;
|
|
}
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static int mount_binds(const char *dest, char **l, unsigned long flags) {
|
|
char **x, **y;
|
|
|
|
STRV_FOREACH_PAIR(x, y, l) {
|
|
char *where;
|
|
struct stat source_st, dest_st;
|
|
int r;
|
|
|
|
if (stat(*x, &source_st) < 0) {
|
|
log_error("failed to stat %s: %m", *x);
|
|
return -errno;
|
|
}
|
|
|
|
where = strappenda(dest, *y);
|
|
r = stat(where, &dest_st);
|
|
if (r == 0) {
|
|
if ((source_st.st_mode & S_IFMT) != (dest_st.st_mode & S_IFMT)) {
|
|
log_error("The file types of %s and %s do not match. Refusing bind mount",
|
|
*x, where);
|
|
return -EINVAL;
|
|
}
|
|
} else if (errno == ENOENT) {
|
|
r = mkdir_parents_label(where, 0755);
|
|
if (r < 0) {
|
|
log_error("Failed to bind mount %s: %s", *x, strerror(-r));
|
|
return r;
|
|
}
|
|
} else {
|
|
log_error("Failed to bind mount %s: %s", *x, strerror(errno));
|
|
return -errno;
|
|
}
|
|
/* Create the mount point, but be conservative -- refuse to create block
|
|
* and char devices. */
|
|
if (S_ISDIR(source_st.st_mode))
|
|
mkdir_label(where, 0755);
|
|
else if (S_ISFIFO(source_st.st_mode))
|
|
mkfifo(where, 0644);
|
|
else if (S_ISSOCK(source_st.st_mode))
|
|
mknod(where, 0644 | S_IFSOCK, 0);
|
|
else if (S_ISREG(source_st.st_mode))
|
|
touch(where);
|
|
else {
|
|
log_error("Refusing to create mountpoint for file: %s", *x);
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
if (mount(*x, where, "bind", MS_BIND, NULL) < 0) {
|
|
log_error("mount(%s) failed: %m", where);
|
|
return -errno;
|
|
}
|
|
|
|
if (flags && mount(NULL, where, NULL, MS_REMOUNT|MS_BIND|flags, NULL) < 0) {
|
|
log_error("mount(%s) failed: %m", where);
|
|
return -errno;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_timezone(const char *dest) {
|
|
_cleanup_free_ char *where = NULL, *p = NULL, *q = NULL, *check = NULL, *what = NULL;
|
|
char *z, *y;
|
|
int r;
|
|
|
|
assert(dest);
|
|
|
|
/* Fix the timezone, if possible */
|
|
r = readlink_malloc("/etc/localtime", &p);
|
|
if (r < 0) {
|
|
log_warning("/etc/localtime is not a symlink, not updating container timezone.");
|
|
return 0;
|
|
}
|
|
|
|
z = path_startswith(p, "../usr/share/zoneinfo/");
|
|
if (!z)
|
|
z = path_startswith(p, "/usr/share/zoneinfo/");
|
|
if (!z) {
|
|
log_warning("/etc/localtime does not point into /usr/share/zoneinfo/, not updating container timezone.");
|
|
return 0;
|
|
}
|
|
|
|
where = strappend(dest, "/etc/localtime");
|
|
if (!where)
|
|
return log_oom();
|
|
|
|
r = readlink_malloc(where, &q);
|
|
if (r >= 0) {
|
|
y = path_startswith(q, "../usr/share/zoneinfo/");
|
|
if (!y)
|
|
y = path_startswith(q, "/usr/share/zoneinfo/");
|
|
|
|
|
|
/* Already pointing to the right place? Then do nothing .. */
|
|
if (y && streq(y, z))
|
|
return 0;
|
|
}
|
|
|
|
check = strjoin(dest, "/usr/share/zoneinfo/", z, NULL);
|
|
if (!check)
|
|
return log_oom();
|
|
|
|
if (access(check, F_OK) < 0) {
|
|
log_warning("Timezone %s does not exist in container, not updating container timezone.", z);
|
|
return 0;
|
|
}
|
|
|
|
what = strappend("../usr/share/zoneinfo/", z);
|
|
if (!what)
|
|
return log_oom();
|
|
|
|
unlink(where);
|
|
if (symlink(what, where) < 0) {
|
|
log_error("Failed to correct timezone of container: %m");
|
|
return 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_resolv_conf(const char *dest) {
|
|
char _cleanup_free_ *where = NULL;
|
|
|
|
assert(dest);
|
|
|
|
if (arg_private_network)
|
|
return 0;
|
|
|
|
/* Fix resolv.conf, if possible */
|
|
where = strappend(dest, "/etc/resolv.conf");
|
|
if (!where)
|
|
return log_oom();
|
|
|
|
/* We don't really care for the results of this really. If it
|
|
* fails, it fails, but meh... */
|
|
copy_file("/etc/resolv.conf", where, O_TRUNC|O_NOFOLLOW);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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) {
|
|
log_error("Failed to generate random boot id: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
snprintf(as_uuid, sizeof(as_uuid),
|
|
"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
|
|
SD_ID128_FORMAT_VAL(rnd));
|
|
char_array_0(as_uuid);
|
|
|
|
r = write_string_file(from, as_uuid);
|
|
if (r < 0) {
|
|
log_error("Failed to write boot id: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
if (mount(from, to, "bind", MS_BIND, NULL) < 0) {
|
|
log_error("Failed to bind mount boot id: %m");
|
|
r = -errno;
|
|
} else if (mount(from, to, "bind", MS_BIND|MS_REMOUNT|MS_RDONLY, NULL))
|
|
log_warning("Failed to make boot id read-only: %m");
|
|
|
|
unlink(from);
|
|
return r;
|
|
}
|
|
|
|
static int copy_devnodes(const char *dest) {
|
|
|
|
static const char devnodes[] =
|
|
"null\0"
|
|
"zero\0"
|
|
"full\0"
|
|
"random\0"
|
|
"urandom\0"
|
|
"tty\0";
|
|
|
|
const char *d;
|
|
int r = 0;
|
|
_cleanup_umask_ mode_t u;
|
|
|
|
assert(dest);
|
|
|
|
u = umask(0000);
|
|
|
|
NULSTR_FOREACH(d, devnodes) {
|
|
_cleanup_free_ char *from = NULL, *to = NULL;
|
|
struct stat st;
|
|
|
|
from = strappend("/dev/", d);
|
|
to = strjoin(dest, "/dev/", d, NULL);
|
|
if (!from || !to)
|
|
return log_oom();
|
|
|
|
if (stat(from, &st) < 0) {
|
|
|
|
if (errno != ENOENT) {
|
|
log_error("Failed to stat %s: %m", from);
|
|
return -errno;
|
|
}
|
|
|
|
} else if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) {
|
|
|
|
log_error("%s is not a char or block device, cannot copy", from);
|
|
return -EIO;
|
|
|
|
} else if (mknod(to, st.st_mode, st.st_rdev) < 0) {
|
|
|
|
log_error("mknod(%s) failed: %m", dest);
|
|
return -errno;
|
|
}
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static int setup_ptmx(const char *dest) {
|
|
_cleanup_free_ char *p = NULL;
|
|
|
|
p = strappend(dest, "/dev/ptmx");
|
|
if (!p)
|
|
return log_oom();
|
|
|
|
if (symlink("pts/ptmx", p) < 0) {
|
|
log_error("Failed to create /dev/ptmx symlink: %m");
|
|
return -errno;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_dev_console(const char *dest, const char *console) {
|
|
struct stat st;
|
|
_cleanup_free_ char *to = NULL;
|
|
int r;
|
|
_cleanup_umask_ mode_t u;
|
|
|
|
assert(dest);
|
|
assert(console);
|
|
|
|
u = umask(0000);
|
|
|
|
if (stat(console, &st) < 0) {
|
|
log_error("Failed to stat %s: %m", console);
|
|
return -errno;
|
|
|
|
} else if (!S_ISCHR(st.st_mode)) {
|
|
log_error("/dev/console is not a char device");
|
|
return -EIO;
|
|
}
|
|
|
|
r = chmod_and_chown(console, 0600, 0, 0);
|
|
if (r < 0) {
|
|
log_error("Failed to correct access mode for TTY: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
if (asprintf(&to, "%s/dev/console", dest) < 0)
|
|
return log_oom();
|
|
|
|
/* 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 device node first, that
|
|
* has the right major/minor (note that the major minor
|
|
* doesn't actually matter here, since we mount it over
|
|
* anyway). */
|
|
|
|
if (mknod(to, (st.st_mode & ~07777) | 0600, st.st_rdev) < 0) {
|
|
log_error("mknod() for /dev/console failed: %m");
|
|
return -errno;
|
|
}
|
|
|
|
if (mount(console, to, "bind", MS_BIND, NULL) < 0) {
|
|
log_error("Bind mount for /dev/console failed: %m");
|
|
return -errno;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_kmsg(const char *dest, int kmsg_socket) {
|
|
_cleanup_free_ char *from = NULL, *to = NULL;
|
|
int r, fd, k;
|
|
_cleanup_umask_ mode_t u;
|
|
union {
|
|
struct cmsghdr cmsghdr;
|
|
uint8_t buf[CMSG_SPACE(sizeof(int))];
|
|
} control = {};
|
|
struct msghdr mh = {
|
|
.msg_control = &control,
|
|
.msg_controllen = sizeof(control),
|
|
};
|
|
struct cmsghdr *cmsg;
|
|
|
|
assert(dest);
|
|
assert(kmsg_socket >= 0);
|
|
|
|
u = umask(0000);
|
|
|
|
/* We create the kmsg FIFO as /dev/kmsg, but immediately
|
|
* 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) {
|
|
log_error("mkfifo() for /dev/kmsg failed: %m");
|
|
return -errno;
|
|
}
|
|
|
|
r = chmod_and_chown(from, 0600, 0, 0);
|
|
if (r < 0) {
|
|
log_error("Failed to correct access mode for /dev/kmsg: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
if (mount(from, to, "bind", MS_BIND, NULL) < 0) {
|
|
log_error("Bind mount for /proc/kmsg failed: %m");
|
|
return -errno;
|
|
}
|
|
|
|
fd = open(from, O_RDWR|O_NDELAY|O_CLOEXEC);
|
|
if (fd < 0) {
|
|
log_error("Failed to open fifo: %m");
|
|
return -errno;
|
|
}
|
|
|
|
cmsg = CMSG_FIRSTHDR(&mh);
|
|
cmsg->cmsg_level = SOL_SOCKET;
|
|
cmsg->cmsg_type = SCM_RIGHTS;
|
|
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
|
|
memcpy(CMSG_DATA(cmsg), &fd, sizeof(int));
|
|
|
|
mh.msg_controllen = cmsg->cmsg_len;
|
|
|
|
/* Store away the fd in the socket, so that it stays open as
|
|
* long as we run the child */
|
|
k = sendmsg(kmsg_socket, &mh, MSG_DONTWAIT|MSG_NOSIGNAL);
|
|
close_nointr_nofail(fd);
|
|
|
|
if (k < 0) {
|
|
log_error("Failed to send FIFO fd: %m");
|
|
return -errno;
|
|
}
|
|
|
|
/* And now make the FIFO unavailable as /dev/kmsg... */
|
|
unlink(from);
|
|
return 0;
|
|
}
|
|
|
|
static int setup_hostname(void) {
|
|
|
|
if (arg_share_system)
|
|
return 0;
|
|
|
|
if (sethostname(arg_machine, strlen(arg_machine)) < 0)
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_journal(const char *directory) {
|
|
sd_id128_t machine_id, this_id;
|
|
_cleanup_free_ char *p = NULL, *b = NULL, *q = NULL, *d = NULL;
|
|
char *id;
|
|
int r;
|
|
|
|
p = strappend(directory, "/etc/machine-id");
|
|
if (!p)
|
|
return log_oom();
|
|
|
|
r = read_one_line_file(p, &b);
|
|
if (r == -ENOENT && arg_link_journal == LINK_AUTO)
|
|
return 0;
|
|
else if (r < 0) {
|
|
log_error("Failed to read machine ID from %s: %s", p, strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
id = strstrip(b);
|
|
if (isempty(id) && arg_link_journal == LINK_AUTO)
|
|
return 0;
|
|
|
|
/* Verify validity */
|
|
r = sd_id128_from_string(id, &machine_id);
|
|
if (r < 0) {
|
|
log_error("Failed to parse machine ID from %s: %s", p, strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_id128_get_machine(&this_id);
|
|
if (r < 0) {
|
|
log_error("Failed to retrieve machine ID: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
if (sd_id128_equal(machine_id, this_id)) {
|
|
log_full(arg_link_journal == LINK_AUTO ? LOG_WARNING : LOG_ERR,
|
|
"Host and machine ids are equal (%s): refusing to link journals", id);
|
|
if (arg_link_journal == LINK_AUTO)
|
|
return 0;
|
|
return
|
|
-EEXIST;
|
|
}
|
|
|
|
if (arg_link_journal == LINK_NO)
|
|
return 0;
|
|
|
|
free(p);
|
|
p = strappend("/var/log/journal/", id);
|
|
q = strjoin(directory, "/var/log/journal/", id, NULL);
|
|
if (!p || !q)
|
|
return log_oom();
|
|
|
|
if (path_is_mount_point(p, false) > 0) {
|
|
if (arg_link_journal != LINK_AUTO) {
|
|
log_error("%s: already a mount point, refusing to use for journal", p);
|
|
return -EEXIST;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
if (path_is_mount_point(q, false) > 0) {
|
|
if (arg_link_journal != LINK_AUTO) {
|
|
log_error("%s: already a mount point, refusing to use for journal", q);
|
|
return -EEXIST;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
r = readlink_and_make_absolute(p, &d);
|
|
if (r >= 0) {
|
|
if ((arg_link_journal == LINK_GUEST ||
|
|
arg_link_journal == LINK_AUTO) &&
|
|
path_equal(d, q)) {
|
|
|
|
r = mkdir_p(q, 0755);
|
|
if (r < 0)
|
|
log_warning("failed to create directory %s: %m", q);
|
|
return 0;
|
|
}
|
|
|
|
if (unlink(p) < 0) {
|
|
log_error("Failed to remove symlink %s: %m", p);
|
|
return -errno;
|
|
}
|
|
} else if (r == -EINVAL) {
|
|
|
|
if (arg_link_journal == LINK_GUEST &&
|
|
rmdir(p) < 0) {
|
|
|
|
if (errno == ENOTDIR) {
|
|
log_error("%s already exists and is neither a symlink nor a directory", p);
|
|
return r;
|
|
} else {
|
|
log_error("Failed to remove %s: %m", p);
|
|
return -errno;
|
|
}
|
|
}
|
|
} else if (r != -ENOENT) {
|
|
log_error("readlink(%s) failed: %m", p);
|
|
return r;
|
|
}
|
|
|
|
if (arg_link_journal == LINK_GUEST) {
|
|
|
|
if (symlink(q, p) < 0) {
|
|
log_error("Failed to symlink %s to %s: %m", q, p);
|
|
return -errno;
|
|
}
|
|
|
|
r = mkdir_p(q, 0755);
|
|
if (r < 0)
|
|
log_warning("failed to create directory %s: %m", q);
|
|
return 0;
|
|
}
|
|
|
|
if (arg_link_journal == LINK_HOST) {
|
|
r = mkdir_p(p, 0755);
|
|
if (r < 0) {
|
|
log_error("Failed to create %s: %m", p);
|
|
return r;
|
|
}
|
|
|
|
} else if (access(p, F_OK) < 0)
|
|
return 0;
|
|
|
|
if (dir_is_empty(q) == 0) {
|
|
log_error("%s not empty.", q);
|
|
return -ENOTEMPTY;
|
|
}
|
|
|
|
r = mkdir_p(q, 0755);
|
|
if (r < 0) {
|
|
log_error("Failed to create %s: %m", q);
|
|
return r;
|
|
}
|
|
|
|
if (mount(p, q, "bind", MS_BIND, NULL) < 0) {
|
|
log_error("Failed to bind mount journal from host into guest: %m");
|
|
return -errno;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_kdbus(const char *dest, const char *path) {
|
|
const char *p;
|
|
|
|
if (!path)
|
|
return 0;
|
|
|
|
p = strappenda(dest, "/dev/kdbus");
|
|
if (mkdir(p, 0755) < 0) {
|
|
log_error("Failed to create kdbus path: %m");
|
|
return -errno;
|
|
}
|
|
|
|
if (mount(path, p, "bind", MS_BIND, NULL) < 0) {
|
|
log_error("Failed to mount kdbus domain path: %m");
|
|
return -errno;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int drop_capabilities(void) {
|
|
return capability_bounding_set_drop(~arg_retain, false);
|
|
}
|
|
|
|
static int register_machine(pid_t pid) {
|
|
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
|
|
_cleanup_bus_unref_ sd_bus *bus = NULL;
|
|
int r;
|
|
|
|
if (!arg_register)
|
|
return 0;
|
|
|
|
r = sd_bus_default_system(&bus);
|
|
if (r < 0) {
|
|
log_error("Failed to open system bus: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
if (arg_keep_unit) {
|
|
r = sd_bus_call_method(
|
|
bus,
|
|
"org.freedesktop.machine1",
|
|
"/org/freedesktop/machine1",
|
|
"org.freedesktop.machine1.Manager",
|
|
"RegisterMachine",
|
|
&error,
|
|
NULL,
|
|
"sayssus",
|
|
arg_machine,
|
|
SD_BUS_MESSAGE_APPEND_ID128(arg_uuid),
|
|
"nspawn",
|
|
"container",
|
|
(uint32_t) pid,
|
|
strempty(arg_directory));
|
|
} else {
|
|
r = sd_bus_call_method(
|
|
bus,
|
|
"org.freedesktop.machine1",
|
|
"/org/freedesktop/machine1",
|
|
"org.freedesktop.machine1.Manager",
|
|
"CreateMachine",
|
|
&error,
|
|
NULL,
|
|
"sayssusa(sv)",
|
|
arg_machine,
|
|
SD_BUS_MESSAGE_APPEND_ID128(arg_uuid),
|
|
"nspawn",
|
|
"container",
|
|
(uint32_t) pid,
|
|
strempty(arg_directory),
|
|
!isempty(arg_slice), "Slice", "s", arg_slice);
|
|
}
|
|
|
|
if (r < 0) {
|
|
log_error("Failed to register machine: %s", bus_error_message(&error, r));
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int terminate_machine(pid_t pid) {
|
|
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
|
|
_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
|
|
_cleanup_bus_unref_ sd_bus *bus = NULL;
|
|
const char *path;
|
|
int r;
|
|
|
|
if (!arg_register)
|
|
return 0;
|
|
|
|
r = sd_bus_default_system(&bus);
|
|
if (r < 0) {
|
|
log_error("Failed to open system bus: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_bus_call_method(
|
|
bus,
|
|
"org.freedesktop.machine1",
|
|
"/org/freedesktop/machine1",
|
|
"org.freedesktop.machine1.Manager",
|
|
"GetMachineByPID",
|
|
&error,
|
|
&reply,
|
|
"u",
|
|
(uint32_t) pid);
|
|
if (r < 0) {
|
|
/* Note that the machine might already have been
|
|
* 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 == -EEXIST)
|
|
return 0;
|
|
if (r < 0) {
|
|
log_error("Failed to read /proc/self/loginuid: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
/* Already reset? */
|
|
if (streq(p, "4294967295"))
|
|
return 0;
|
|
|
|
r = write_string_file("/proc/self/loginuid", "4294967295");
|
|
if (r < 0) {
|
|
log_error("Failed to reset audit login UID. This probably means that your kernel is too\n"
|
|
"old and you have audit enabled. Note that the auditing subsystem is known to\n"
|
|
"be incompatible with containers on old kernels. Please make sure to upgrade\n"
|
|
"your kernel or to off auditing with 'audit=0' on the kernel command line before\n"
|
|
"using systemd-nspawn. Sleeping for 5s... (%s)\n", strerror(-r));
|
|
|
|
sleep(5);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_veth(pid_t pid, char iface_name[]) {
|
|
_cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
|
|
_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
|
|
int r;
|
|
|
|
if (!arg_private_network)
|
|
return 0;
|
|
|
|
if (!arg_network_veth)
|
|
return 0;
|
|
|
|
strncpy(iface_name+3, arg_machine, IFNAMSIZ - 3);
|
|
|
|
r = sd_rtnl_open(0, &rtnl);
|
|
if (r < 0) {
|
|
log_error("Failed to connect to netlink: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_rtnl_message_new_link(rtnl, RTM_NEWLINK, 0, &m);
|
|
if (r < 0) {
|
|
log_error("Failed to allocate netlink message: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_rtnl_message_append_string(m, IFLA_IFNAME, iface_name);
|
|
if (r < 0) {
|
|
log_error("Failed to add netlink interface name: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_rtnl_message_open_container(m, IFLA_LINKINFO);
|
|
if (r < 0) {
|
|
log_error("Failed to open netlink container: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_rtnl_message_append_string(m, IFLA_INFO_KIND, "veth");
|
|
if (r < 0) {
|
|
log_error("Failed to append netlink kind: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_rtnl_message_open_container(m, IFLA_INFO_DATA);
|
|
if (r < 0) {
|
|
log_error("Failed to open netlink container: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_rtnl_message_open_container(m, VETH_INFO_PEER);
|
|
if (r < 0) {
|
|
log_error("Failed to open netlink container: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_rtnl_message_append_string(m, IFLA_IFNAME, "host0");
|
|
if (r < 0) {
|
|
log_error("Failed to add netlink interface name: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid);
|
|
if (r < 0) {
|
|
log_error("Failed to add netlink namespace field: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_rtnl_message_close_container(m);
|
|
if (r < 0) {
|
|
log_error("Failed to close netlink container: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_rtnl_message_close_container(m);
|
|
if (r < 0) {
|
|
log_error("Failed to close netlink container: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_rtnl_message_close_container(m);
|
|
if (r < 0) {
|
|
log_error("Failed to close netlink container: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_rtnl_call(rtnl, m, 0, NULL);
|
|
if (r < 0) {
|
|
log_error("Failed to add new veth interfaces: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_bridge(const char veth_name[]) {
|
|
_cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
|
|
_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
|
|
int r, bridge;
|
|
|
|
if (!arg_private_network)
|
|
return 0;
|
|
|
|
if (!arg_network_veth)
|
|
return 0;
|
|
|
|
if (!arg_network_bridge)
|
|
return 0;
|
|
|
|
bridge = (int) if_nametoindex(arg_network_bridge);
|
|
if (bridge <= 0) {
|
|
log_error("Failed to resolve interface %s: %m", arg_network_bridge);
|
|
return -errno;
|
|
}
|
|
|
|
r = sd_rtnl_open(0, &rtnl);
|
|
if (r < 0) {
|
|
log_error("Failed to connect to netlink: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_rtnl_message_new_link(rtnl, RTM_SETLINK, 0, &m);
|
|
if (r < 0) {
|
|
log_error("Failed to allocate netlink message: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_rtnl_message_append_string(m, IFLA_IFNAME, veth_name);
|
|
if (r < 0) {
|
|
log_error("Failed to add netlink interface name field: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_rtnl_message_append_u32(m, IFLA_MASTER, bridge);
|
|
if (r < 0) {
|
|
log_error("Failed to add netlink master field: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_rtnl_call(rtnl, m, 0, NULL);
|
|
if (r < 0) {
|
|
log_error("Failed to add veth interface to bridge: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int 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(0, &rtnl);
|
|
if (r < 0) {
|
|
log_error("Failed to connect to netlink: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
udev = udev_new();
|
|
if (!udev) {
|
|
log_error("Failed to connect to udev.");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
STRV_FOREACH(i, arg_network_interfaces) {
|
|
_cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
|
|
_cleanup_udev_device_unref_ struct udev_device *d = NULL;
|
|
char ifi_str[2 + DECIMAL_STR_MAX(int)];
|
|
int ifi;
|
|
|
|
ifi = (int) if_nametoindex(*i);
|
|
if (ifi <= 0) {
|
|
log_error("Failed to resolve interface %s: %m", *i);
|
|
return -errno;
|
|
}
|
|
|
|
sprintf(ifi_str, "n%i", ifi);
|
|
d = udev_device_new_from_device_id(udev, ifi_str);
|
|
if (!d) {
|
|
log_error("Failed to get udev device for interface %s: %m", *i);
|
|
return -errno;
|
|
}
|
|
|
|
if (udev_device_get_is_initialized(d) <= 0) {
|
|
log_error("Network interface %s is not initialized yet.", *i);
|
|
return -EBUSY;
|
|
}
|
|
|
|
r = sd_rtnl_message_new_link(rtnl, RTM_NEWLINK, ifi, &m);
|
|
if (r < 0) {
|
|
log_error("Failed to allocate netlink message: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid);
|
|
if (r < 0) {
|
|
log_error("Failed to append namespace PID to netlink message: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
r = sd_rtnl_call(rtnl, m, 0, NULL);
|
|
if (r < 0) {
|
|
log_error("Failed to move interface %s to namespace: %s", *i, strerror(-r));
|
|
return r;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int audit_still_doesnt_work_in_containers(void) {
|
|
|
|
#ifdef HAVE_SECCOMP
|
|
scmp_filter_ctx seccomp;
|
|
int r;
|
|
|
|
/*
|
|
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.
|
|
*/
|
|
|
|
seccomp = seccomp_init(SCMP_ACT_ALLOW);
|
|
if (!seccomp)
|
|
return log_oom();
|
|
|
|
r = seccomp_add_secondary_archs(seccomp);
|
|
if (r < 0 && r != -EEXIST) {
|
|
log_error("Failed to add secondary archs to seccomp filter: %s", strerror(-r));
|
|
goto finish;
|
|
}
|
|
|
|
r = seccomp_rule_add_exact(
|
|
seccomp,
|
|
SCMP_ACT_ERRNO(EAFNOSUPPORT),
|
|
SCMP_SYS(socket),
|
|
2,
|
|
SCMP_A0(SCMP_CMP_EQ, AF_NETLINK),
|
|
SCMP_A2(SCMP_CMP_EQ, NETLINK_AUDIT));
|
|
if (r < 0) {
|
|
log_error("Failed to add audit seccomp rule: %s", strerror(-r));
|
|
goto finish;
|
|
}
|
|
|
|
r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
|
|
if (r < 0) {
|
|
log_error("Failed to unset NO_NEW_PRIVS: %s", strerror(-r));
|
|
goto finish;
|
|
}
|
|
|
|
r = seccomp_load(seccomp);
|
|
if (r < 0)
|
|
log_error("Failed to install seccomp audit filter: %s", strerror(-r));
|
|
|
|
finish:
|
|
seccomp_release(seccomp);
|
|
return r;
|
|
#else
|
|
return 0;
|
|
#endif
|
|
|
|
}
|
|
|
|
int main(int argc, char *argv[]) {
|
|
|
|
_cleanup_close_ int master = -1, kdbus_fd = -1, sync_fd = -1;
|
|
_cleanup_close_pipe_ int kmsg_socket_pair[2] = { -1, -1 };
|
|
_cleanup_free_ char *kdbus_domain = NULL;
|
|
_cleanup_fdset_free_ FDSet *fds = NULL;
|
|
const char *console = NULL;
|
|
int r = EXIT_FAILURE, k;
|
|
int n_fd_passed;
|
|
pid_t pid = 0;
|
|
sigset_t mask;
|
|
char veth_name[IFNAMSIZ] = "ve-";
|
|
|
|
log_parse_environment();
|
|
log_open();
|
|
|
|
k = parse_argv(argc, argv);
|
|
if (k < 0)
|
|
goto finish;
|
|
else if (k == 0) {
|
|
r = EXIT_SUCCESS;
|
|
goto finish;
|
|
}
|
|
|
|
if (arg_directory) {
|
|
char *p;
|
|
|
|
p = path_make_absolute_cwd(arg_directory);
|
|
free(arg_directory);
|
|
arg_directory = p;
|
|
} else
|
|
arg_directory = get_current_dir_name();
|
|
|
|
if (!arg_directory) {
|
|
log_error("Failed to determine path, please use -D.");
|
|
goto finish;
|
|
}
|
|
|
|
path_kill_slashes(arg_directory);
|
|
|
|
if (!arg_machine) {
|
|
arg_machine = strdup(basename(arg_directory));
|
|
if (!arg_machine) {
|
|
log_oom();
|
|
goto finish;
|
|
}
|
|
|
|
hostname_cleanup(arg_machine, false);
|
|
if (isempty(arg_machine)) {
|
|
log_error("Failed to determine machine name automatically, please use -M.");
|
|
goto finish;
|
|
}
|
|
}
|
|
|
|
if (geteuid() != 0) {
|
|
log_error("Need to be root.");
|
|
goto finish;
|
|
}
|
|
|
|
if (sd_booted() <= 0) {
|
|
log_error("Not running on a systemd system.");
|
|
goto finish;
|
|
}
|
|
|
|
if (path_equal(arg_directory, "/")) {
|
|
log_error("Spawning container on root directory not supported.");
|
|
goto finish;
|
|
}
|
|
|
|
if (arg_boot) {
|
|
if (path_is_os_tree(arg_directory) <= 0) {
|
|
log_error("Directory %s doesn't look like an OS root directory (/etc/os-release is missing). Refusing.", arg_directory);
|
|
goto finish;
|
|
}
|
|
} else {
|
|
const char *p;
|
|
|
|
p = strappenda(arg_directory,
|
|
argc > optind && path_is_absolute(argv[optind]) ? argv[optind] : "/usr/bin/");
|
|
if (access(p, F_OK) < 0) {
|
|
log_error("Directory %s lacks the binary to execute or doesn't look like a binary tree. Refusing.", arg_directory);
|
|
goto finish;
|
|
|
|
}
|
|
}
|
|
|
|
log_close();
|
|
n_fd_passed = sd_listen_fds(false);
|
|
if (n_fd_passed > 0) {
|
|
k = fdset_new_listen_fds(&fds, false);
|
|
if (k < 0) {
|
|
log_error("Failed to collect file descriptors: %s", strerror(-k));
|
|
goto finish;
|
|
}
|
|
}
|
|
fdset_close_others(fds);
|
|
log_open();
|
|
|
|
master = posix_openpt(O_RDWR|O_NOCTTY|O_CLOEXEC|O_NDELAY);
|
|
if (master < 0) {
|
|
log_error("Failed to acquire pseudo tty: %m");
|
|
goto finish;
|
|
}
|
|
|
|
console = ptsname(master);
|
|
if (!console) {
|
|
log_error("Failed to determine tty name: %m");
|
|
goto finish;
|
|
}
|
|
|
|
if (!arg_quiet)
|
|
log_info("Spawning container %s on %s. Press ^] three times within 1s to abort execution.", arg_machine, arg_directory);
|
|
|
|
if (unlockpt(master) < 0) {
|
|
log_error("Failed to unlock tty: %m");
|
|
goto finish;
|
|
}
|
|
|
|
if (access("/dev/kdbus/control", F_OK) >= 0) {
|
|
|
|
if (arg_share_system) {
|
|
kdbus_domain = strdup("/dev/kdbus");
|
|
if (!kdbus_domain) {
|
|
log_oom();
|
|
goto finish;
|
|
}
|
|
} else {
|
|
const char *ns;
|
|
|
|
ns = strappenda("machine-", arg_machine);
|
|
kdbus_fd = bus_kernel_create_domain(ns, &kdbus_domain);
|
|
if (r < 0)
|
|
log_debug("Failed to create kdbus domain: %s", strerror(-r));
|
|
else
|
|
log_debug("Successfully created kdbus domain as %s", kdbus_domain);
|
|
}
|
|
}
|
|
|
|
if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0, kmsg_socket_pair) < 0) {
|
|
log_error("Failed to create kmsg socket pair: %m");
|
|
goto finish;
|
|
}
|
|
|
|
sd_notify(0, "READY=1");
|
|
|
|
assert_se(sigemptyset(&mask) == 0);
|
|
sigset_add_many(&mask, SIGCHLD, SIGWINCH, SIGTERM, SIGINT, -1);
|
|
assert_se(sigprocmask(SIG_BLOCK, &mask, NULL) == 0);
|
|
|
|
for (;;) {
|
|
siginfo_t status;
|
|
|
|
sync_fd = eventfd(0, EFD_CLOEXEC);
|
|
if (sync_fd < 0) {
|
|
log_error("Failed to create event fd: %m");
|
|
goto finish;
|
|
}
|
|
|
|
pid = syscall(__NR_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)
|
|
log_error("clone() failed, do you have namespace support enabled in your kernel? (You need UTS, IPC, PID and NET namespacing built in): %m");
|
|
else
|
|
log_error("clone() failed: %m");
|
|
|
|
goto finish;
|
|
}
|
|
|
|
if (pid == 0) {
|
|
/* child */
|
|
const char *home = NULL;
|
|
uid_t uid = (uid_t) -1;
|
|
gid_t gid = (gid_t) -1;
|
|
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;
|
|
eventfd_t x;
|
|
|
|
envp[n_env] = strv_find_prefix(environ, "TERM=");
|
|
if (envp[n_env])
|
|
n_env ++;
|
|
|
|
close_nointr_nofail(master);
|
|
master = -1;
|
|
|
|
close_nointr(STDIN_FILENO);
|
|
close_nointr(STDOUT_FILENO);
|
|
close_nointr(STDERR_FILENO);
|
|
|
|
close_nointr_nofail(kmsg_socket_pair[0]);
|
|
kmsg_socket_pair[0] = -1;
|
|
|
|
reset_all_signal_handlers();
|
|
|
|
assert_se(sigemptyset(&mask) == 0);
|
|
assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
|
|
|
|
k = open_terminal(console, O_RDWR);
|
|
if (k != STDIN_FILENO) {
|
|
if (k >= 0) {
|
|
close_nointr_nofail(k);
|
|
k = -EINVAL;
|
|
}
|
|
|
|
log_error("Failed to open console: %s", strerror(-k));
|
|
goto child_fail;
|
|
}
|
|
|
|
if (dup2(STDIN_FILENO, STDOUT_FILENO) != STDOUT_FILENO ||
|
|
dup2(STDIN_FILENO, STDERR_FILENO) != STDERR_FILENO) {
|
|
log_error("Failed to duplicate console: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (setsid() < 0) {
|
|
log_error("setsid() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (reset_audit_loginuid() < 0)
|
|
goto child_fail;
|
|
|
|
if (prctl(PR_SET_PDEATHSIG, SIGKILL) < 0) {
|
|
log_error("PR_SET_PDEATHSIG failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
/* 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("MS_SLAVE|MS_REC failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
/* Turn directory into bind mount */
|
|
if (mount(arg_directory, arg_directory, "bind", MS_BIND|MS_REC, NULL) < 0) {
|
|
log_error("Failed to make bind mount.");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (arg_read_only)
|
|
if (mount(arg_directory, arg_directory, "bind", MS_BIND|MS_REMOUNT|MS_RDONLY|MS_REC, NULL) < 0) {
|
|
log_error("Failed to make read-only.");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (mount_all(arg_directory) < 0)
|
|
goto child_fail;
|
|
|
|
if (copy_devnodes(arg_directory) < 0)
|
|
goto child_fail;
|
|
|
|
if (setup_ptmx(arg_directory) < 0)
|
|
goto child_fail;
|
|
|
|
dev_setup(arg_directory);
|
|
|
|
if (audit_still_doesnt_work_in_containers() < 0)
|
|
goto child_fail;
|
|
|
|
if (setup_dev_console(arg_directory, console) < 0)
|
|
goto child_fail;
|
|
|
|
if (setup_kmsg(arg_directory, kmsg_socket_pair[1]) < 0)
|
|
goto child_fail;
|
|
|
|
close_nointr_nofail(kmsg_socket_pair[1]);
|
|
kmsg_socket_pair[1] = -1;
|
|
|
|
if (setup_boot_id(arg_directory) < 0)
|
|
goto child_fail;
|
|
|
|
if (setup_timezone(arg_directory) < 0)
|
|
goto child_fail;
|
|
|
|
if (setup_resolv_conf(arg_directory) < 0)
|
|
goto child_fail;
|
|
|
|
if (setup_journal(arg_directory) < 0)
|
|
goto child_fail;
|
|
|
|
if (mount_binds(arg_directory, arg_bind, 0) < 0)
|
|
goto child_fail;
|
|
|
|
if (mount_binds(arg_directory, arg_bind_ro, MS_RDONLY) < 0)
|
|
goto child_fail;
|
|
|
|
if (setup_kdbus(arg_directory, kdbus_domain) < 0)
|
|
goto child_fail;
|
|
|
|
if (chdir(arg_directory) < 0) {
|
|
log_error("chdir(%s) failed: %m", arg_directory);
|
|
goto child_fail;
|
|
}
|
|
|
|
if (mount(arg_directory, "/", NULL, MS_MOVE, NULL) < 0) {
|
|
log_error("mount(MS_MOVE) failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (chroot(".") < 0) {
|
|
log_error("chroot() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (chdir("/") < 0) {
|
|
log_error("chdir() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
umask(0022);
|
|
|
|
if (arg_private_network)
|
|
loopback_setup();
|
|
|
|
if (drop_capabilities() < 0) {
|
|
log_error("drop_capabilities() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (arg_user) {
|
|
|
|
/* Note that this resolves user names
|
|
* inside the container, and hence
|
|
* accesses the NSS modules from the
|
|
* container and not the host. This is
|
|
* a bit weird... */
|
|
|
|
if (get_user_creds((const char**)&arg_user, &uid, &gid, &home, NULL) < 0) {
|
|
log_error("get_user_creds() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (mkdir_parents_label(home, 0775) < 0) {
|
|
log_error("mkdir_parents_label() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (mkdir_safe_label(home, 0775, uid, gid) < 0) {
|
|
log_error("mkdir_safe_label() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (initgroups((const char*)arg_user, gid) < 0) {
|
|
log_error("initgroups() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (setresgid(gid, gid, gid) < 0) {
|
|
log_error("setregid() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (setresuid(uid, uid, uid) < 0) {
|
|
log_error("setreuid() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
} else {
|
|
/* Reset everything fully to 0, just in case */
|
|
|
|
if (setgroups(0, NULL) < 0) {
|
|
log_error("setgroups() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (setresgid(0, 0, 0) < 0) {
|
|
log_error("setregid() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
|
|
if (setresuid(0, 0, 0) < 0) {
|
|
log_error("setreuid() failed: %m");
|
|
goto child_fail;
|
|
}
|
|
}
|
|
|
|
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();
|
|
goto child_fail;
|
|
}
|
|
|
|
if (!sd_id128_equal(arg_uuid, SD_ID128_NULL)) {
|
|
if (asprintf((char**)(envp + n_env++), "container_uuid=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(arg_uuid)) < 0) {
|
|
log_oom();
|
|
goto child_fail;
|
|
}
|
|
}
|
|
|
|
if (fdset_size(fds) > 0) {
|
|
k = fdset_cloexec(fds, false);
|
|
if (k < 0) {
|
|
log_error("Failed to unset O_CLOEXEC for file descriptors.");
|
|
goto child_fail;
|
|
}
|
|
|
|
if ((asprintf((char **)(envp + n_env++), "LISTEN_FDS=%u", n_fd_passed) < 0) ||
|
|
(asprintf((char **)(envp + n_env++), "LISTEN_PID=1") < 0)) {
|
|
log_oom();
|
|
goto child_fail;
|
|
}
|
|
}
|
|
|
|
setup_hostname();
|
|
|
|
eventfd_read(sync_fd, &x);
|
|
close_nointr_nofail(sync_fd);
|
|
sync_fd = -1;
|
|
|
|
if (!strv_isempty(arg_setenv)) {
|
|
char **n;
|
|
|
|
n = strv_env_merge(2, envp, arg_setenv);
|
|
if (!n) {
|
|
log_oom();
|
|
goto child_fail;
|
|
}
|
|
|
|
env_use = n;
|
|
} else
|
|
env_use = (char**) envp;
|
|
|
|
#ifdef HAVE_SELINUX
|
|
if (arg_selinux_context)
|
|
if (setexeccon(arg_selinux_context) < 0)
|
|
log_error("setexeccon(\"%s\") failed: %m", arg_selinux_context);
|
|
#endif
|
|
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("execv() failed: %m");
|
|
|
|
child_fail:
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
fdset_free(fds);
|
|
fds = NULL;
|
|
|
|
r = register_machine(pid);
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
r = move_network_interfaces(pid);
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
r = setup_veth(pid, veth_name);
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
r = setup_bridge(veth_name);
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
eventfd_write(sync_fd, 1);
|
|
close_nointr_nofail(sync_fd);
|
|
sync_fd = -1;
|
|
|
|
k = process_pty(master, &mask, arg_boot ? pid : 0, SIGRTMIN+3);
|
|
if (k < 0) {
|
|
r = EXIT_FAILURE;
|
|
break;
|
|
}
|
|
|
|
if (!arg_quiet)
|
|
putc('\n', stdout);
|
|
|
|
/* Kill if it is not dead yet anyway */
|
|
terminate_machine(pid);
|
|
|
|
/* Redundant, but better safe than sorry */
|
|
kill(pid, SIGKILL);
|
|
|
|
k = wait_for_terminate(pid, &status);
|
|
pid = 0;
|
|
|
|
if (k < 0) {
|
|
r = EXIT_FAILURE;
|
|
break;
|
|
}
|
|
|
|
if (status.si_code == CLD_EXITED) {
|
|
r = status.si_status;
|
|
if (status.si_status != 0) {
|
|
log_error("Container %s failed with error code %i.", arg_machine, status.si_status);
|
|
break;
|
|
}
|
|
|
|
if (!arg_quiet)
|
|
log_debug("Container %s exited successfully.", arg_machine);
|
|
break;
|
|
} else if (status.si_code == CLD_KILLED &&
|
|
status.si_status == SIGINT) {
|
|
|
|
if (!arg_quiet)
|
|
log_info("Container %s has been shut down.", arg_machine);
|
|
r = 0;
|
|
break;
|
|
} else if (status.si_code == CLD_KILLED &&
|
|
status.si_status == SIGHUP) {
|
|
|
|
if (!arg_quiet)
|
|
log_info("Container %s is being rebooted.", arg_machine);
|
|
continue;
|
|
} else if (status.si_code == CLD_KILLED ||
|
|
status.si_code == CLD_DUMPED) {
|
|
|
|
log_error("Container %s terminated by signal %s.", arg_machine, signal_to_string(status.si_status));
|
|
r = EXIT_FAILURE;
|
|
break;
|
|
} else {
|
|
log_error("Container %s failed due to unknown reason.", arg_machine);
|
|
r = EXIT_FAILURE;
|
|
break;
|
|
}
|
|
}
|
|
|
|
finish:
|
|
if (pid > 0)
|
|
kill(pid, SIGKILL);
|
|
|
|
free(arg_directory);
|
|
free(arg_machine);
|
|
free(arg_setenv);
|
|
free(arg_network_interfaces);
|
|
|
|
return r;
|
|
}
|