#include <sys/un.h>
#include <sys/socket.h>
#include <linux/netlink.h>
+#include <sys/eventfd.h>
+#include <net/if.h>
+#include <linux/veth.h>
+
+#ifdef HAVE_SELINUX
+#include <selinux/selinux.h>
+#endif
+
+#ifdef HAVE_SECCOMP
+#include <seccomp.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 "bus-error.h"
#include "ptyfwd.h"
#include "bus-kernel.h"
+#include "env-util.h"
+#include "def.h"
+#include "rtnl-util.h"
+#include "udev-util.h"
-#ifndef TTY_GID
-#define TTY_GID 5
+#ifdef HAVE_SECCOMP
+#include "seccomp-util.h"
#endif
typedef enum LinkJournal {
static char *arg_user = NULL;
static sd_id128_t arg_uuid = {};
static char *arg_machine = NULL;
+static char *arg_selinux_context = NULL;
+static char *arg_selinux_apifs_context = NULL;
static const char *arg_slice = NULL;
static bool arg_private_network = false;
static bool arg_read_only = false;
(1ULL << CAP_SYS_RESOURCE) |
(1ULL << CAP_SYS_BOOT) |
(1ULL << CAP_AUDIT_WRITE) |
- (1ULL << CAP_AUDIT_CONTROL);
+ (1ULL << CAP_AUDIT_CONTROL) |
+ (1ULL << CAP_MKNOD);
static char **arg_bind = NULL;
static char **arg_bind_ro = NULL;
+static char **arg_setenv = NULL;
+static bool arg_quiet = false;
+static bool arg_share_system = false;
+static bool arg_register = true;
+static bool arg_keep_unit = false;
+static char **arg_network_interfaces = NULL;
+static bool arg_network_veth = false;
+static char *arg_network_bridge = NULL;
static int help(void) {
printf("%s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n"
"Spawn a minimal namespace container for debugging, testing and building.\n\n"
- " -h --help Show this help\n"
- " --version Print version string\n"
- " -D --directory=NAME Root directory 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"
- " --uuid=UUID Set a specific machine UUID for the container\n"
- " -M --machine=NAME Set the machine name for the container\n"
- " -S --slice=SLICE Place the container in the specified slice\n"
- " --private-network Disable network in container\n"
- " --read-only Mount the root directory read-only\n"
- " --capability=CAP In addition to the default, retain specified\n"
- " capability\n"
- " --drop-capability=CAP Drop the specified capability from the default set\n"
- " --link-journal=MODE Link up guest journal, one of no, auto, guest, host\n"
- " -j Equivalent to --link-journal=host\n"
- " --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",
+ " -h --help Show this help\n"
+ " --version Print version string\n"
+ " -q --quiet Do not show status information\n"
+ " -D --directory=NAME Root directory for the container\n"
+ " -b --boot Boot up full system (i.e. invoke init)\n"
+ " -u --user=USER Run the command under specified user or uid\n"
+ " -M --machine=NAME Set the machine name for the container\n"
+ " --uuid=UUID Set a specific machine UUID for the container\n"
+ " -S --slice=SLICE Place the container in the specified slice\n"
+ " --private-network Disable network in container\n"
+ " --network-interface=INTERFACE\n"
+ " Assign an existing network interface to the\n"
+ " container\n"
+ " --network-veth Add a virtual ethernet connection between host\n"
+ " and container\n"
+ " --network-bridge=INTERFACE\n"
+ " Add a virtual ethernet connection between host\n"
+ " and container and add it to an existing bridge on\n"
+ " the host\n"
+ " -Z --selinux-context=SECLABEL\n"
+ " Set the SELinux security context to be used by\n"
+ " processes in the container\n"
+ " -L --selinux-apifs-context=SECLABEL\n"
+ " Set the SELinux security context to be used by\n"
+ " API/tmpfs file systems in the container\n"
+ " --capability=CAP In addition to the default, retain specified\n"
+ " capability\n"
+ " --drop-capability=CAP Drop the specified capability from the default set\n"
+ " --link-journal=MODE Link up guest journal, one of no, auto, guest, host\n"
+ " -j Equivalent to --link-journal=host\n"
+ " --read-only Mount the root directory read-only\n"
+ " --bind=PATH[:PATH] Bind mount a file or directory from the host into\n"
+ " the container\n"
+ " --bind-ro=PATH[:PATH] Similar, but creates a read-only bind mount\n"
+ " --setenv=NAME=VALUE Pass an environment variable to PID 1\n"
+ " --share-system Share system namespaces with host\n"
+ " --register=BOOLEAN Register container as machine\n"
+ " --keep-unit Do not register a scope for the machine, reuse\n"
+ " the service unit nspawn is running in\n",
program_invocation_short_name);
return 0;
ARG_DROP_CAPABILITY,
ARG_LINK_JOURNAL,
ARG_BIND,
- ARG_BIND_RO
+ ARG_BIND_RO,
+ ARG_SETENV,
+ ARG_SHARE_SYSTEM,
+ ARG_REGISTER,
+ ARG_KEEP_UNIT,
+ ARG_NETWORK_INTERFACE,
+ ARG_NETWORK_VETH,
+ ARG_NETWORK_BRIDGE,
};
static const struct option options[] = {
- { "help", no_argument, NULL, 'h' },
- { "version", no_argument, NULL, ARG_VERSION },
- { "directory", required_argument, NULL, 'D' },
- { "user", required_argument, NULL, 'u' },
- { "private-network", no_argument, NULL, ARG_PRIVATE_NETWORK },
- { "boot", no_argument, NULL, 'b' },
- { "uuid", required_argument, NULL, ARG_UUID },
- { "read-only", no_argument, NULL, ARG_READ_ONLY },
- { "capability", required_argument, NULL, ARG_CAPABILITY },
- { "drop-capability", required_argument, NULL, ARG_DROP_CAPABILITY },
- { "link-journal", required_argument, NULL, ARG_LINK_JOURNAL },
- { "bind", required_argument, NULL, ARG_BIND },
- { "bind-ro", required_argument, NULL, ARG_BIND_RO },
- { "machine", required_argument, NULL, 'M' },
- { "slice", required_argument, NULL, 'S' },
+ { "help", no_argument, NULL, 'h' },
+ { "version", no_argument, NULL, ARG_VERSION },
+ { "directory", required_argument, NULL, 'D' },
+ { "user", required_argument, NULL, 'u' },
+ { "private-network", no_argument, NULL, ARG_PRIVATE_NETWORK },
+ { "boot", no_argument, NULL, 'b' },
+ { "uuid", required_argument, NULL, ARG_UUID },
+ { "read-only", no_argument, NULL, ARG_READ_ONLY },
+ { "capability", required_argument, NULL, ARG_CAPABILITY },
+ { "drop-capability", required_argument, NULL, ARG_DROP_CAPABILITY },
+ { "link-journal", required_argument, NULL, ARG_LINK_JOURNAL },
+ { "bind", required_argument, NULL, ARG_BIND },
+ { "bind-ro", required_argument, NULL, ARG_BIND_RO },
+ { "machine", required_argument, NULL, 'M' },
+ { "slice", required_argument, NULL, 'S' },
+ { "setenv", required_argument, NULL, ARG_SETENV },
+ { "selinux-context", required_argument, NULL, 'Z' },
+ { "selinux-apifs-context", required_argument, NULL, 'L' },
+ { "quiet", no_argument, NULL, 'q' },
+ { "share-system", no_argument, NULL, ARG_SHARE_SYSTEM },
+ { "register", required_argument, NULL, ARG_REGISTER },
+ { "keep-unit", no_argument, NULL, ARG_KEEP_UNIT },
+ { "network-interface", required_argument, NULL, ARG_NETWORK_INTERFACE },
+ { "network-veth", no_argument, NULL, ARG_NETWORK_VETH },
+ { "network-bridge", required_argument, NULL, ARG_NETWORK_BRIDGE },
{}
};
int c, r;
+ uint64_t plus = 0, minus = 0;
assert(argc >= 0);
assert(argv);
- while ((c = getopt_long(argc, argv, "+hD:u:bM:jS:", options, NULL)) >= 0) {
+ while ((c = getopt_long(argc, argv, "+hD:u:bL:M:jS:Z:q", options, NULL)) >= 0) {
switch (c) {
break;
+ case ARG_NETWORK_BRIDGE:
+ arg_network_bridge = strdup(optarg);
+ if (!arg_network_bridge)
+ return log_oom();
+
+ /* fall through */
+
+ case ARG_NETWORK_VETH:
+ arg_network_veth = true;
+ arg_private_network = true;
+ break;
+
+ case ARG_NETWORK_INTERFACE:
+ if (strv_push(&arg_network_interfaces, optarg) < 0)
+ return log_oom();
+
+ /* fall through */
+
case ARG_PRIVATE_NETWORK:
arg_private_network = true;
break;
break;
case 'M':
- if (!hostname_is_valid(optarg)) {
- log_error("Invalid machine name: %s", optarg);
- return -EINVAL;
+ if (isempty(optarg)) {
+ free(arg_machine);
+ arg_machine = NULL;
+ } else {
+
+ if (!hostname_is_valid(optarg)) {
+ log_error("Invalid machine name: %s", optarg);
+ return -EINVAL;
+ }
+
+ free(arg_machine);
+ arg_machine = strdup(optarg);
+ if (!arg_machine)
+ return log_oom();
+
+ break;
}
- free(arg_machine);
- arg_machine = strdup(optarg);
- if (!arg_machine)
- return log_oom();
+ case 'Z':
+ arg_selinux_context = optarg;
+ break;
+ case 'L':
+ arg_selinux_apifs_context = optarg;
break;
case ARG_READ_ONLY:
size_t length;
FOREACH_WORD_SEPARATOR(word, length, optarg, ",", state) {
+ _cleanup_free_ char *t;
cap_value_t cap;
- char *t;
t = strndup(word, length);
if (!t)
return log_oom();
- if (cap_from_name(t, &cap) < 0) {
- log_error("Failed to parse capability %s.", t);
- free(t);
- return -EINVAL;
+ if (streq(t, "all")) {
+ if (c == ARG_CAPABILITY)
+ plus = (uint64_t) -1;
+ else
+ minus = (uint64_t) -1;
+ } else {
+ if (cap_from_name(t, &cap) < 0) {
+ log_error("Failed to parse capability %s.", t);
+ return -EINVAL;
+ }
+
+ if (c == ARG_CAPABILITY)
+ plus |= 1ULL << (uint64_t) cap;
+ else
+ minus |= 1ULL << (uint64_t) cap;
}
-
- free(t);
-
- if (c == ARG_CAPABILITY)
- arg_retain |= 1ULL << (uint64_t) cap;
- else
- arg_retain &= ~(1ULL << (uint64_t) cap);
}
break;
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 '?':
return -EINVAL;
}
}
+ 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;
+ }
+
+ arg_retain = (arg_retain | plus | (arg_private_network ? 1ULL << CAP_NET_ADMIN : 0)) & ~minus;
+
return 1;
}
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);
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,
- mount_table[k].options) < 0 &&
+ o) < 0 &&
mount_table[k].fatal) {
log_error("mount(%s) failed: %m", where);
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 */
u = umask(0000);
NULSTR_FOREACH(d, devnodes) {
- struct stat st;
_cleanup_free_ char *from = NULL, *to = NULL;
+ struct stat st;
- asprintf(&from, "/dev/%s", d);
- asprintf(&to, "%s/dev/%s", dest, d);
-
- if (!from || !to) {
- log_oom();
-
- if (r == 0)
- r = -ENOMEM;
-
- break;
- }
+ 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);
- if (r == 0)
- r = -errno;
+ 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);
- if (r == 0)
- r = -EIO;
+ return -EIO;
} else if (mknod(to, st.st_mode, st.st_rdev) < 0) {
log_error("mknod(%s) failed: %m", dest);
- if (r == 0)
- r = -errno;
+ return -errno;
}
}
static int setup_hostname(void) {
+ if (arg_share_system)
+ return 0;
+
if (sethostname(arg_machine, strlen(arg_machine)) < 0)
return -errno;
}
static int setup_journal(const char *directory) {
- sd_id128_t machine_id;
+ sd_id128_t machine_id, this_id;
_cleanup_free_ char *p = NULL, *b = NULL, *q = NULL, *d = NULL;
char *id;
int r;
- if (arg_link_journal == LINK_NO)
- return 0;
-
p = strappend(directory, "/etc/machine-id");
if (!p)
return log_oom();
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 (mount(path, p, "bind", MS_BIND, NULL) < 0) {
- log_error("Failed to mount kdbus namespace path: %m");
+ log_error("Failed to mount kdbus domain path: %m");
return -errno;
}
return capability_bounding_set_drop(~arg_retain, false);
}
-static int register_machine(void) {
+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;
- r = sd_bus_open_system(&bus);
+ 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",
- "CreateMachine",
- &error,
- NULL,
- "sayssusa(sv)",
- arg_machine,
- SD_BUS_MESSAGE_APPEND_ID128(arg_uuid),
- "nspawn",
- "container",
- (uint32_t) 0,
- strempty(arg_directory),
- !isempty(arg_slice), "Slice", "s", arg_slice);
+ 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;
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 0;
}
-static bool audit_enabled(void) {
- int fd;
+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));
- fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_AUDIT);
- if (fd >= 0) {
- close_nointr_nofail(fd);
- return true;
+ sleep(5);
}
- return false;
+
+ 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(
+ 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[]) {
- pid_t pid = 0;
+
+ _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;
- _cleanup_close_ int master = -1, kdbus_fd = -1;
int n_fd_passed;
- const char *console = NULL;
+ pid_t pid = 0;
sigset_t mask;
- _cleanup_close_pipe_ int kmsg_socket_pair[2] = { -1, -1 };
- _cleanup_fdset_free_ FDSet *fds = NULL;
- _cleanup_free_ char *kdbus_namespace = NULL;
+ char veth_name[IFNAMSIZ] = "ve-";
log_parse_environment();
log_open();
goto finish;
}
- if (arg_boot && audit_enabled()) {
- log_warning("The kernel auditing subsystem is known to be incompatible with containers.\n"
- "Please make sure to turn off auditing with 'audit=0' on the kernel command\n"
- "line before using systemd-nspawn. Sleeping for 5s...\n");
- sleep(5);
- }
-
if (path_equal(arg_directory, "/")) {
log_error("Spawning container on root directory not supported.");
goto finish;
}
- 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;
+ 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();
goto finish;
}
- log_info("Spawning container %s on %s. Press ^] three times within 1s to abort execution.", arg_machine, arg_directory);
+ 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;
}
- kdbus_fd = bus_kernel_create_namespace(arg_machine, &kdbus_namespace);
- if (r < 0)
- log_debug("Failed to create kdbus namespace: %s", strerror(-r));
- else
- log_debug("Successfully created kdbus namespace as %s", kdbus_namespace);
+ 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.");
+ log_error("Failed to create kmsg socket pair: %m");
goto finish;
}
for (;;) {
siginfo_t status;
- pid = syscall(__NR_clone, SIGCHLD|CLONE_NEWIPC|CLONE_NEWNS|CLONE_NEWPID|CLONE_NEWUTS|(arg_private_network ? CLONE_NEWNET : 0), NULL);
+ 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");
gid_t gid = (gid_t) -1;
unsigned n_env = 2;
const char *envp[] = {
- "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
+ "PATH=" DEFAULT_PATH_SPLIT_USR,
"container=systemd-nspawn", /* LXC sets container=lxc, so follow the scheme here */
NULL, /* TERM */
NULL, /* HOME */
NULL, /* LISTEN_PID */
NULL
};
+ char **env_use;
+ eventfd_t x;
envp[n_env] = strv_find_prefix(environ, "TERM=");
if (envp[n_env])
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;
}
- r = register_machine();
- if (r < 0)
- goto finish;
-
/* Mark everything as slave, so that we still
* receive mounts from the real root, but don't
* propagate mounts to the real root. */
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 (mount_binds(arg_directory, arg_bind_ro, MS_RDONLY) < 0)
goto child_fail;
- if (setup_kdbus(arg_directory, kdbus_namespace) < 0)
+ if (setup_kdbus(arg_directory, kdbus_domain) < 0)
goto child_fail;
if (chdir(arg_directory) < 0) {
umask(0022);
- loopback_setup();
+ if (arg_private_network)
+ loopback_setup();
if (drop_capabilities() < 0) {
log_error("drop_capabilities() failed: %m");
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;
memcpy(a + 1, argv + optind, l * sizeof(char*));
a[0] = (char*) "/usr/lib/systemd/systemd";
- execve(a[0], a, (char**) envp);
+ execve(a[0], a, env_use);
a[0] = (char*) "/lib/systemd/systemd";
- execve(a[0], a, (char**) envp);
+ execve(a[0], a, env_use);
a[0] = (char*) "/sbin/init";
- execve(a[0], a, (char**) envp);
+ execve(a[0], a, env_use);
} else if (argc > optind)
- execvpe(argv[optind], argv + optind, (char**) envp);
+ execvpe(argv[optind], argv + optind, env_use);
else {
chdir(home ? home : "/root");
- execle("/bin/bash", "-bash", NULL, (char**) envp);
+ execle("/bin/bash", "-bash", NULL, env_use);
+ execle("/bin/sh", "-sh", NULL, env_use);
}
log_error("execv() failed: %m");
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;
}
- putc('\n', stdout);
+ if (!arg_quiet)
+ putc('\n', stdout);
/* Kill if it is not dead yet anyway */
terminate_machine(pid);
break;
}
- log_debug("Container %s exited successfully.", arg_machine);
+ if (!arg_quiet)
+ log_debug("Container %s exited successfully.", arg_machine);
break;
} else if (status.si_code == CLD_KILLED &&
status.si_status == SIGINT) {
- log_info("Container %s has been shut down.", arg_machine);
+
+ 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) {
- log_info("Container %s is being rebooted.", arg_machine);
+
+ 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));
+ log_error("Container %s terminated by signal %s.", arg_machine, signal_to_string(status.si_status));
r = EXIT_FAILURE;
break;
} else {
free(arg_directory);
free(arg_machine);
+ free(arg_setenv);
+ free(arg_network_interfaces);
return r;
}
~ianmdlvl / elogind.git / blobdiff