#include <net/if.h>
#include <linux/veth.h>
#include <sys/personality.h>
+#include <linux/loop.h>
#ifdef HAVE_SELINUX
#include <selinux/selinux.h>
#include <seccomp.h>
#endif
+#ifdef HAVE_BLKID
+#include <blkid/blkid.h>
+#endif
+
#include "sd-daemon.h"
#include "sd-bus.h"
#include "sd-id128.h"
#include "def.h"
#include "rtnl-util.h"
#include "udev-util.h"
+#include "blkid-util.h"
+#include "gpt.h"
+#include "siphash24.h"
#ifdef HAVE_SECCOMP
#include "seccomp-util.h"
static bool arg_network_veth = false;
static const char *arg_network_bridge = NULL;
static unsigned long arg_personality = 0xffffffffLU;
+static const char *arg_image = NULL;
static int help(void) {
" -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"
+ " -D --directory=PATH Root directory for the container\n"
+ " -i --image=PATH File system device or image for the container\n"
" -b --boot Boot up full system (i.e. invoke init)\n"
" -u --user=USER Run the command under specified user or uid\n"
" -M --machine=NAME Set the machine name for the container\n"
{ "network-veth", no_argument, NULL, ARG_NETWORK_VETH },
{ "network-bridge", required_argument, NULL, ARG_NETWORK_BRIDGE },
{ "personality", required_argument, NULL, ARG_PERSONALITY },
+ { "image", required_argument, NULL, 'i' },
{}
};
assert(argc >= 0);
assert(argv);
- while ((c = getopt_long(argc, argv, "+hD:u:bL:M:jS:Z:q", options, NULL)) >= 0) {
+ while ((c = getopt_long(argc, argv, "+hD:u:bL:M:jS:Z:qi:", options, NULL)) >= 0) {
switch (c) {
break;
+ case 'i':
+ arg_image = optarg;
+ break;
+
case 'u':
free(arg_user);
arg_user = strdup(optarg);
return -EINVAL;
}
+ if (arg_directory && arg_image) {
+ log_error("--directory= and --image= may not be combined.");
+ return -EINVAL;
+ }
+
arg_retain = (arg_retain | plus | (arg_private_network ? 1ULL << CAP_NET_ADMIN : 0)) & ~minus;
return 1;
int r;
if (stat(*x, &source_st) < 0) {
- log_error("failed to stat %s: %m", *x);
+ log_error("Failed to stat %s: %m", *x);
return -errno;
}
}
static int setup_dev_console(const char *dest, const char *console) {
+ _cleanup_umask_ mode_t u;
+ const char *to;
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);
+ if (stat("/dev/null", &st) < 0) {
+ log_error("Failed to stat /dev/null: %m");
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);
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). */
+ * to bind mount things on we create a device node first, and
+ * use /dev/null for that since we the cgroups device policy
+ * allows us to create that freely, while we cannot create
+ * /dev/console. (Note that the major minor doesn't actually
+ * matter here, since we mount it over anyway). */
+ to = strappenda(dest, "/dev/console");
if (mknod(to, (st.st_mode & ~07777) | 0600, st.st_rdev) < 0) {
log_error("mknod() for /dev/console failed: %m");
return -errno;
/* 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);
+ safe_close(fd);
if (k < 0) {
log_error("Failed to send FIFO fd: %m");
return r;
}
- r = sd_bus_message_append(m, "(sv)", "DeviceAllow", "a(ss)", 8,
+ r = sd_bus_message_append(m, "(sv)", "DeviceAllow", "a(ss)", 10,
/* Allow the container to
* access and create the API
* device nodes, so that
* container to ever create
* these device nodes. */
"/dev/pts/ptmx", "rw",
- "char-pts", "rw");
+ "char-pts", "rw",
+ /* Allow the container
+ * access to all kdbus
+ * devices. Again, the
+ * container cannot create
+ * these nodes, only use
+ * them. We use a pretty
+ * open match here, so that
+ * the kernel API can still
+ * change. */
+ "char-kdbus", "rw",
+ "char-kdbus/*", "rw");
if (r < 0) {
log_error("Failed to add device whitelist: %s", strerror(-r));
return r;
return 0;
r = read_one_line_file("/proc/self/loginuid", &p);
- if (r == -EEXIST)
+ if (r == -ENOENT)
return 0;
if (r < 0) {
log_error("Failed to read /proc/self/loginuid: %s", strerror(-r));
return 0;
}
+#define HASH_KEY SD_ID128_MAKE(c3,c4,f9,19,b5,57,b2,1c,e6,cf,14,27,03,9c,ee,a2)
+
+static int get_mac(struct ether_addr *mac) {
+ int r;
+
+ uint8_t result[8];
+ size_t l, sz;
+ uint8_t *v;
+
+ l = strlen(arg_machine);
+ sz = sizeof(sd_id128_t) + l;
+ v = alloca(sz);
+
+ /* fetch some persistent data unique to the host */
+ r = sd_id128_get_machine((sd_id128_t*) v);
+ if (r < 0)
+ return r;
+
+ /* combine with some data unique (on this host) to this
+ * container instance */
+ memcpy(v + sizeof(sd_id128_t), arg_machine, l);
+
+ /* Let's hash the host machine ID plus the container name. We
+ * use a fixed, but originally randomly created hash key here. */
+ siphash24(result, v, sz, HASH_KEY.bytes);
+
+ assert_cc(ETH_ALEN <= sizeof(result));
+ memcpy(mac->ether_addr_octet, result, ETH_ALEN);
+
+ /* see eth_random_addr in the kernel */
+ mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
+ mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */
+
+ return 0;
+}
+
static int setup_veth(pid_t pid, char iface_name[IFNAMSIZ]) {
_cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
+ struct ether_addr mac;
int r;
if (!arg_private_network)
memcpy(iface_name, "vb-", 3);
else
memcpy(iface_name, "ve-", 3);
-
strncpy(iface_name+3, arg_machine, IFNAMSIZ - 3);
+ r = get_mac(&mac);
+ if (r < 0) {
+ log_error("Failed to generate predictable MAC address for host0");
+ return r;
+ }
+
r = sd_rtnl_open(&rtnl, 0);
if (r < 0) {
log_error("Failed to connect to netlink: %s", strerror(-r));
return r;
}
- r = sd_rtnl_message_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);
+ r = sd_rtnl_message_open_container_union(m, IFLA_INFO_DATA, "veth");
if (r < 0) {
log_error("Failed to open netlink container: %s", strerror(-r));
return r;
return r;
}
+ r = sd_rtnl_message_append_ether_addr(m, IFLA_ADDRESS, &mac);
+ if (r < 0) {
+ log_error("Failed to add netlink MAC address: %s", strerror(-r));
+ return r;
+ }
+
r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid);
if (r < 0) {
log_error("Failed to add netlink namespace field: %s", strerror(-r));
return r;
}
+ r = sd_rtnl_message_link_set_flags(m, IFF_UP, IFF_UP);
+ if (r < 0) {
+ log_error("Failed to set IFF_UP flag: %s", strerror(-r));
+ return r;
+ }
+
r = sd_rtnl_message_append_string(m, IFLA_IFNAME, veth_name);
if (r < 0) {
log_error("Failed to add netlink interface name field: %s", strerror(-r));
return r;
}
- r = sd_rtnl_message_append_string(m, IFLA_INFO_KIND, "macvlan");
- 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);
+ r = sd_rtnl_message_open_container_union(m, IFLA_INFO_DATA, "macvlan");
if (r < 0) {
log_error("Failed to open netlink container: %s", strerror(-r));
return r;
}
+static int setup_image(char **device_path, int *loop_nr) {
+ struct loop_info64 info = {
+ .lo_flags = LO_FLAGS_AUTOCLEAR|LO_FLAGS_PARTSCAN
+ };
+ _cleanup_close_ int fd = -1, control = -1, loop = -1;
+ _cleanup_free_ char* loopdev = NULL;
+ struct stat st;
+ int r, nr;
+
+ assert(device_path);
+ assert(loop_nr);
+
+ fd = open(arg_image, O_CLOEXEC|(arg_read_only ? O_RDONLY : O_RDWR)|O_NONBLOCK|O_NOCTTY);
+ if (fd < 0) {
+ log_error("Failed to open %s: %m", arg_image);
+ return -errno;
+ }
+
+ if (fstat(fd, &st) < 0) {
+ log_error("Failed to stat %s: %m", arg_image);
+ return -errno;
+ }
+
+ if (S_ISBLK(st.st_mode)) {
+ char *p;
+
+ p = strdup(arg_image);
+ if (!p)
+ return log_oom();
+
+ *device_path = p;
+
+ *loop_nr = -1;
+
+ r = fd;
+ fd = -1;
+
+ return r;
+ }
+
+ if (!S_ISREG(st.st_mode)) {
+ log_error("%s is not a regular file or block device: %m", arg_image);
+ return -EINVAL;
+ }
+
+ control = open("/dev/loop-control", O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
+ if (control < 0) {
+ log_error("Failed to open /dev/loop-control: %m");
+ return -errno;
+ }
+
+ nr = ioctl(control, LOOP_CTL_GET_FREE);
+ if (nr < 0) {
+ log_error("Failed to allocate loop device: %m");
+ return -errno;
+ }
+
+ if (asprintf(&loopdev, "/dev/loop%i", nr) < 0)
+ return log_oom();
+
+ loop = open(loopdev, O_CLOEXEC|(arg_read_only ? O_RDONLY : O_RDWR)|O_NONBLOCK|O_NOCTTY);
+ if (loop < 0) {
+ log_error("Failed to open loop device %s: %m", loopdev);
+ return -errno;
+ }
+
+ if (ioctl(loop, LOOP_SET_FD, fd) < 0) {
+ log_error("Failed to set loopback file descriptor on %s: %m", loopdev);
+ return -errno;
+ }
+
+ if (arg_read_only)
+ info.lo_flags |= LO_FLAGS_READ_ONLY;
+
+ if (ioctl(loop, LOOP_SET_STATUS64, &info) < 0) {
+ log_error("Failed to set loopback settings on %s: %m", loopdev);
+ return -errno;
+ }
+
+ *device_path = loopdev;
+ loopdev = NULL;
+
+ *loop_nr = nr;
+
+ r = loop;
+ loop = -1;
+
+ return r;
+}
+
+static int dissect_image(
+ int fd,
+ char **root_device, bool *root_device_rw,
+ char **home_device, bool *home_device_rw,
+ char **srv_device, bool *srv_device_rw,
+ bool *secondary) {
+
+#ifdef HAVE_BLKID
+ int home_nr = -1, root_nr = -1, secondary_root_nr = -1, srv_nr = -1;
+ _cleanup_free_ char *home = NULL, *root = NULL, *secondary_root = NULL, *srv = NULL;
+ _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
+ _cleanup_udev_device_unref_ struct udev_device *d = NULL;
+ _cleanup_blkid_free_probe_ blkid_probe b = NULL;
+ _cleanup_udev_unref_ struct udev *udev = NULL;
+ struct udev_list_entry *first, *item;
+ bool home_rw = true, root_rw = true, secondary_root_rw = true, srv_rw = true;
+ const char *pttype = NULL;
+ blkid_partlist pl;
+ struct stat st;
+ int r;
+
+ assert(fd >= 0);
+ assert(root_device);
+ assert(home_device);
+ assert(srv_device);
+ assert(secondary);
+
+ b = blkid_new_probe();
+ if (!b)
+ return log_oom();
+
+ errno = 0;
+ r = blkid_probe_set_device(b, fd, 0, 0);
+ if (r != 0) {
+ if (errno == 0)
+ return log_oom();
+
+ log_error("Failed to set device on blkid probe: %m");
+ return -errno;
+ }
+
+ blkid_probe_enable_partitions(b, 1);
+ blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS);
+
+ errno = 0;
+ r = blkid_do_safeprobe(b);
+ if (r == -2 || r == 1) {
+ log_error("Failed to identify any partition table on %s.\n"
+ "Note that the disk image needs to follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/ to be supported by systemd-nspawn.", arg_image);
+ return -EINVAL;
+ } else if (r != 0) {
+ if (errno == 0)
+ errno = EIO;
+ log_error("Failed to probe: %m");
+ return -errno;
+ }
+
+ blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL);
+ if (!streq_ptr(pttype, "gpt")) {
+ log_error("Image %s does not carry a GUID Partition Table.\n"
+ "Note that the disk image needs to follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/ to be supported by systemd-nspawn.", arg_image);
+ return -EINVAL;
+ }
+
+ errno = 0;
+ pl = blkid_probe_get_partitions(b);
+ if (!pl) {
+ if (errno == 0)
+ return log_oom();
+
+ log_error("Failed to list partitions of %s", arg_image);
+ return -errno;
+ }
+
+ udev = udev_new();
+ if (!udev)
+ return log_oom();
+
+ if (fstat(fd, &st) < 0) {
+ log_error("Failed to stat block device: %m");
+ return -errno;
+ }
+
+ d = udev_device_new_from_devnum(udev, 'b', st.st_rdev);
+ if (!d)
+ return log_oom();
+
+ e = udev_enumerate_new(udev);
+ if (!e)
+ return log_oom();
+
+ r = udev_enumerate_add_match_parent(e, d);
+ if (r < 0)
+ return log_oom();
+
+ r = udev_enumerate_scan_devices(e);
+ if (r < 0) {
+ log_error("Failed to scan for partition devices of %s: %s", arg_image, strerror(-r));
+ return r;
+ }
+
+ first = udev_enumerate_get_list_entry(e);
+ udev_list_entry_foreach(item, first) {
+ _cleanup_udev_device_unref_ struct udev_device *q;
+ const char *stype, *node;
+ unsigned long long flags;
+ sd_id128_t type_id;
+ blkid_partition pp;
+ dev_t qn;
+ int nr;
+
+ errno = 0;
+ q = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
+ if (!q) {
+ if (!errno)
+ errno = ENOMEM;
+
+ log_error("Failed to get partition device of %s: %m", arg_image);
+ return -errno;
+ }
+
+ qn = udev_device_get_devnum(q);
+ if (major(qn) == 0)
+ continue;
+
+ if (st.st_rdev == qn)
+ continue;
+
+ node = udev_device_get_devnode(q);
+ if (!node)
+ continue;
+
+ pp = blkid_partlist_devno_to_partition(pl, qn);
+ if (!pp)
+ continue;
+
+ flags = blkid_partition_get_flags(pp);
+ if (flags & GPT_FLAG_NO_AUTO)
+ continue;
+
+ nr = blkid_partition_get_partno(pp);
+ if (nr < 0)
+ continue;
+
+ stype = blkid_partition_get_type_string(pp);
+ if (!stype)
+ continue;
+
+ if (sd_id128_from_string(stype, &type_id) < 0)
+ continue;
+
+ if (sd_id128_equal(type_id, GPT_HOME)) {
+
+ if (home && nr >= home_nr)
+ continue;
+
+ home_nr = nr;
+ home_rw = !(flags & GPT_FLAG_READ_ONLY);
+
+ free(home);
+ home = strdup(node);
+ if (!home)
+ return log_oom();
+ } else if (sd_id128_equal(type_id, GPT_SRV)) {
+
+ if (srv && nr >= srv_nr)
+ continue;
+
+ srv_nr = nr;
+ srv_rw = !(flags & GPT_FLAG_READ_ONLY);
+
+ free(srv);
+ srv = strdup(node);
+ if (!srv)
+ return log_oom();
+ }
+#ifdef GPT_ROOT_NATIVE
+ else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE)) {
+
+ if (root && nr >= root_nr)
+ continue;
+
+ root_nr = nr;
+ root_rw = !(flags & GPT_FLAG_READ_ONLY);
+
+ free(root);
+ root = strdup(node);
+ if (!root)
+ return log_oom();
+ }
+#endif
+#ifdef GPT_ROOT_SECONDARY
+ else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY)) {
+
+ if (secondary_root && nr >= secondary_root_nr)
+ continue;
+
+ secondary_root_nr = nr;
+ secondary_root_rw = !(flags & GPT_FLAG_READ_ONLY);
+
+
+ free(secondary_root);
+ secondary_root = strdup(node);
+ if (!secondary_root)
+ return log_oom();
+ }
+#endif
+ }
+
+ if (!root && !secondary_root) {
+ log_error("Failed to identify root partition in disk image %s.\n"
+ "Note that the disk image needs to follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/ to be supported by systemd-nspawn.", arg_image);
+ return -EINVAL;
+ }
+
+ if (root) {
+ *root_device = root;
+ root = NULL;
+
+ *root_device_rw = root_rw;
+ *secondary = false;
+ } else if (secondary_root) {
+ *root_device = secondary_root;
+ secondary_root = NULL;
+
+ *root_device_rw = secondary_root_rw;
+ *secondary = true;
+ }
+
+ if (home) {
+ *home_device = home;
+ home = NULL;
+
+ *home_device_rw = home_rw;
+ }
+
+ if (srv) {
+ *srv_device = srv;
+ srv = NULL;
+
+ *srv_device_rw = srv_rw;
+ }
+
+ return 0;
+#else
+ log_error("--image= is not supported, compiled without blkid support.");
+ return -ENOTSUP;
+#endif
+}
+
+static int mount_device(const char *what, const char *where, const char *directory, bool rw) {
+#ifdef HAVE_BLKID
+ _cleanup_blkid_free_probe_ blkid_probe b = NULL;
+ const char *fstype, *p;
+ int r;
+
+ assert(what);
+ assert(where);
+
+ if (arg_read_only)
+ rw = false;
+
+ if (directory)
+ p = strappenda(where, directory);
+ else
+ p = where;
+
+ errno = 0;
+ b = blkid_new_probe_from_filename(what);
+ if (!b) {
+ if (errno == 0)
+ return log_oom();
+ log_error("Failed to allocate prober for %s: %m", what);
+ return -errno;
+ }
+
+ blkid_probe_enable_superblocks(b, 1);
+ blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE);
+
+ errno = 0;
+ r = blkid_do_safeprobe(b);
+ if (r == -1 || r == 1) {
+ log_error("Cannot determine file system type of %s", what);
+ return -EINVAL;
+ } else if (r != 0) {
+ if (errno == 0)
+ errno = EIO;
+ log_error("Failed to probe %s: %m", what);
+ return -errno;
+ }
+
+ errno = 0;
+ if (blkid_probe_lookup_value(b, "TYPE", &fstype, NULL) < 0) {
+ if (errno == 0)
+ errno = EINVAL;
+ log_error("Failed to determine file system type of %s", what);
+ return -errno;
+ }
+
+ if (streq(fstype, "crypto_LUKS")) {
+ log_error("nspawn currently does not support LUKS disk images.");
+ return -ENOTSUP;
+ }
+
+ if (mount(what, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), NULL) < 0) {
+ log_error("Failed to mount %s: %m", what);
+ return -errno;
+ }
+
+ return 0;
+#else
+ log_error("--image= is not supported, compiled without blkid support.");
+ return -ENOTSUP;
+#endif
+}
+
+static int mount_devices(
+ const char *where,
+ const char *root_device, bool root_device_rw,
+ const char *home_device, bool home_device_rw,
+ const char *srv_device, bool srv_device_rw) {
+ int r;
+
+ assert(where);
+
+ if (root_device) {
+ r = mount_device(root_device, arg_directory, NULL, root_device_rw);
+ if (r < 0) {
+ log_error("Failed to mount root directory: %s", strerror(-r));
+ return r;
+ }
+ }
+
+ if (home_device) {
+ r = mount_device(home_device, arg_directory, "/home", home_device_rw);
+ if (r < 0) {
+ log_error("Failed to mount home directory: %s", strerror(-r));
+ return r;
+ }
+ }
+
+ if (srv_device) {
+ r = mount_device(srv_device, arg_directory, "/srv", srv_device_rw);
+ if (r < 0) {
+ log_error("Failed to mount server data directory: %s", strerror(-r));
+ return r;
+ }
+ }
+
+ return 0;
+}
+
+static void loop_remove(int nr, int *image_fd) {
+ _cleanup_close_ int control = -1;
+
+ if (nr < 0)
+ return;
+
+ if (image_fd && *image_fd >= 0) {
+ ioctl(*image_fd, LOOP_CLR_FD);
+ *image_fd = safe_close(*image_fd);
+ }
+
+ control = open("/dev/loop-control", O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
+ if (control < 0)
+ return;
+
+ ioctl(control, LOOP_CTL_REMOVE, nr);
+}
+
+static int spawn_getent(const char *database, const char *key, pid_t *rpid) {
+ int pipe_fds[2];
+ pid_t pid;
+
+ assert(database);
+ assert(key);
+ assert(rpid);
+
+ if (pipe2(pipe_fds, O_CLOEXEC) < 0) {
+ log_error("Failed to allocate pipe: %m");
+ return -errno;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_error("Failed to fork getent child: %m");
+ return -errno;
+ } else if (pid == 0) {
+ int nullfd;
+ char *empty_env = NULL;
+
+ if (dup3(pipe_fds[1], STDOUT_FILENO, 0) < 0)
+ _exit(EXIT_FAILURE);
+
+ if (pipe_fds[0] > 2)
+ safe_close(pipe_fds[0]);
+ if (pipe_fds[1] > 2)
+ safe_close(pipe_fds[1]);
+
+ nullfd = open("/dev/null", O_RDWR);
+ if (nullfd < 0)
+ _exit(EXIT_FAILURE);
+
+ if (dup3(nullfd, STDIN_FILENO, 0) < 0)
+ _exit(EXIT_FAILURE);
+
+ if (dup3(nullfd, STDERR_FILENO, 0) < 0)
+ _exit(EXIT_FAILURE);
+
+ if (nullfd > 2)
+ safe_close(nullfd);
+
+ reset_all_signal_handlers();
+ close_all_fds(NULL, 0);
+
+ execle("/usr/bin/getent", "getent", database, key, NULL, &empty_env);
+ execle("/bin/getent", "getent", database, key, NULL, &empty_env);
+ _exit(EXIT_FAILURE);
+ }
+
+ pipe_fds[1] = safe_close(pipe_fds[1]);
+
+ *rpid = pid;
+
+ return pipe_fds[0];
+}
+
+static int change_uid_gid(char **_home) {
+ char line[LINE_MAX], *w, *x, *state, *u, *g, *h;
+ _cleanup_free_ uid_t *uids = NULL;
+ _cleanup_free_ char *home = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ _cleanup_close_ int fd = -1;
+ unsigned n_uids = 0;
+ size_t sz, l;
+ uid_t uid;
+ gid_t gid;
+ pid_t pid;
+ int r;
+
+ assert(_home);
+
+ if (!arg_user || streq(arg_user, "root") || streq(arg_user, "0")) {
+ /* Reset everything fully to 0, just in case */
+
+ if (setgroups(0, NULL) < 0) {
+ log_error("setgroups() failed: %m");
+ return -errno;
+ }
+
+ if (setresgid(0, 0, 0) < 0) {
+ log_error("setregid() failed: %m");
+ return -errno;
+ }
+
+ if (setresuid(0, 0, 0) < 0) {
+ log_error("setreuid() failed: %m");
+ return -errno;
+ }
+
+ *_home = NULL;
+ return 0;
+ }
+
+ /* First, get user credentials */
+ fd = spawn_getent("passwd", arg_user, &pid);
+ if (fd < 0)
+ return fd;
+
+ f = fdopen(fd, "r");
+ if (!f)
+ return log_oom();
+ fd = -1;
+
+ if (!fgets(line, sizeof(line), f)) {
+
+ if (!ferror(f)) {
+ log_error("Failed to resolve user %s.", arg_user);
+ return -ESRCH;
+ }
+
+ log_error("Failed to read from getent: %m");
+ return -errno;
+ }
+
+ truncate_nl(line);
+
+ wait_for_terminate_and_warn("getent passwd", pid);
+
+ x = strchr(line, ':');
+ if (!x) {
+ log_error("/etc/passwd entry has invalid user field.");
+ return -EIO;
+ }
+
+ u = strchr(x+1, ':');
+ if (!u) {
+ log_error("/etc/passwd entry has invalid password field.");
+ return -EIO;
+ }
+
+ u++;
+ g = strchr(u, ':');
+ if (!g) {
+ log_error("/etc/passwd entry has invalid UID field.");
+ return -EIO;
+ }
+
+ *g = 0;
+ g++;
+ x = strchr(g, ':');
+ if (!x) {
+ log_error("/etc/passwd entry has invalid GID field.");
+ return -EIO;
+ }
+
+ *x = 0;
+ h = strchr(x+1, ':');
+ if (!h) {
+ log_error("/etc/passwd entry has invalid GECOS field.");
+ return -EIO;
+ }
+
+ h++;
+ x = strchr(h, ':');
+ if (!x) {
+ log_error("/etc/passwd entry has invalid home directory field.");
+ return -EIO;
+ }
+
+ *x = 0;
+
+ r = parse_uid(u, &uid);
+ if (r < 0) {
+ log_error("Failed to parse UID of user.");
+ return -EIO;
+ }
+
+ r = parse_gid(g, &gid);
+ if (r < 0) {
+ log_error("Failed to parse GID of user.");
+ return -EIO;
+ }
+
+ home = strdup(h);
+ if (!home)
+ return log_oom();
+
+ /* Second, get group memberships */
+ fd = spawn_getent("initgroups", arg_user, &pid);
+ if (fd < 0)
+ return fd;
+
+ fclose(f);
+ f = fdopen(fd, "r");
+ if (!f)
+ return log_oom();
+ fd = -1;
+
+ if (!fgets(line, sizeof(line), f)) {
+ if (!ferror(f)) {
+ log_error("Failed to resolve user %s.", arg_user);
+ return -ESRCH;
+ }
+
+ log_error("Failed to read from getent: %m");
+ return -errno;
+ }
+
+ truncate_nl(line);
+
+ wait_for_terminate_and_warn("getent initgroups", pid);
+
+ /* Skip over the username and subsequent separator whitespace */
+ x = line;
+ x += strcspn(x, WHITESPACE);
+ x += strspn(x, WHITESPACE);
+
+ FOREACH_WORD(w, l, x, state) {
+ char c[l+1];
+
+ memcpy(c, w, l);
+ c[l] = 0;
+
+ if (!GREEDY_REALLOC(uids, sz, n_uids+1))
+ return log_oom();
+
+ r = parse_uid(c, &uids[n_uids++]);
+ if (r < 0) {
+ log_error("Failed to parse group data from getent.");
+ return -EIO;
+ }
+ }
+
+ r = mkdir_parents(home, 0775);
+ if (r < 0) {
+ log_error("Failed to make home root directory: %s", strerror(-r));
+ return r;
+ }
+
+ r = mkdir_safe(home, 0755, uid, gid);
+ if (r < 0 && r != -EEXIST) {
+ log_error("Failed to make home directory: %s", strerror(-r));
+ return r;
+ }
+
+ fchown(STDIN_FILENO, uid, gid);
+ fchown(STDOUT_FILENO, uid, gid);
+ fchown(STDERR_FILENO, uid, gid);
+
+ if (setgroups(n_uids, uids) < 0) {
+ log_error("Failed to set auxiliary groups: %m");
+ return -errno;
+ }
+
+ if (setresgid(gid, gid, gid) < 0) {
+ log_error("setregid() failed: %m");
+ return -errno;
+ }
+
+ if (setresuid(uid, uid, uid) < 0) {
+ log_error("setreuid() failed: %m");
+ return -errno;
+ }
+
+ if (_home) {
+ *_home = home;
+ home = NULL;
+ }
+
+ return 0;
+}
+
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_free_ char *kdbus_domain = NULL, *device_path = NULL, *root_device = NULL, *home_device = NULL, *srv_device = NULL;
+ bool root_device_rw = true, home_device_rw = true, srv_device_rw = true;
+ _cleanup_close_ int master = -1, kdbus_fd = -1, image_fd = -1;
+ _cleanup_close_pair_ int kmsg_socket_pair[2] = { -1, -1 };
_cleanup_fdset_free_ FDSet *fds = NULL;
+ int r = EXIT_FAILURE, k, n_fd_passed, loop_nr = -1;
const char *console = NULL;
- int r = EXIT_FAILURE, k;
- int n_fd_passed;
+ char veth_name[IFNAMSIZ];
+ bool secondary = false;
pid_t pid = 0;
sigset_t mask;
- char veth_name[IFNAMSIZ];
log_parse_environment();
log_open();
goto finish;
}
- if (arg_directory) {
- char *p;
+ if (!arg_image) {
+ if (arg_directory) {
+ char *p;
- p = path_make_absolute_cwd(arg_directory);
- free(arg_directory);
- arg_directory = p;
- } else
- arg_directory = get_current_dir_name();
+ 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;
+ if (!arg_directory) {
+ log_error("Failed to determine path, please use -D.");
+ goto finish;
+ }
+ path_kill_slashes(arg_directory);
}
- path_kill_slashes(arg_directory);
-
if (!arg_machine) {
- arg_machine = strdup(basename(arg_directory));
+ arg_machine = strdup(basename(arg_image ? arg_image : arg_directory));
if (!arg_machine) {
log_oom();
goto finish;
goto finish;
}
- if (path_equal(arg_directory, "/")) {
- log_error("Spawning container on root directory not supported.");
- goto finish;
+ log_close();
+ n_fd_passed = sd_listen_fds(false);
+ if (n_fd_passed > 0) {
+ k = fdset_new_listen_fds(&fds, false);
+ if (k < 0) {
+ log_error("Failed to collect file descriptors: %s", strerror(-k));
+ goto finish;
+ }
}
+ fdset_close_others(fds);
+ log_open();
- if (arg_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);
+ if (arg_directory) {
+ if (path_equal(arg_directory, "/")) {
+ log_error("Spawning container on root directory not supported.");
goto finish;
}
+
+ if (arg_boot) {
+ if (path_is_os_tree(arg_directory) <= 0) {
+ log_error("Directory %s doesn't look like an OS root directory (/etc/os-release is missing). Refusing.", arg_directory);
+ goto finish;
+ }
+ } else {
+ const char *p;
+
+ p = strappenda(arg_directory,
+ argc > optind && path_is_absolute(argv[optind]) ? argv[optind] : "/usr/bin/");
+ if (access(p, F_OK) < 0) {
+ log_error("Directory %s lacks the binary to execute or doesn't look like a binary tree. Refusing.", arg_directory);
+ goto finish;
+
+ }
+ }
} else {
- const char *p;
+ char template[] = "/tmp/nspawn-root-XXXXXX";
- 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);
+ if (!mkdtemp(template)) {
+ log_error("Failed to create temporary directory: %m");
+ r = -errno;
goto finish;
+ }
+ arg_directory = strdup(template);
+ if (!arg_directory) {
+ r = log_oom();
+ goto finish;
}
- }
- 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));
+ image_fd = setup_image(&device_path, &loop_nr);
+ if (image_fd < 0) {
+ r = image_fd;
goto finish;
}
+
+ r = dissect_image(image_fd, &root_device, &root_device_rw, &home_device, &home_device_rw, &srv_device, &srv_device_rw, &secondary);
+ if (r < 0)
+ goto finish;
}
- fdset_close_others(fds);
- log_open();
master = posix_openpt(O_RDWR|O_NOCTTY|O_CLOEXEC|O_NDELAY);
if (master < 0) {
}
if (!arg_quiet)
- log_info("Spawning container %s on %s. Press ^] three times within 1s to abort execution.", arg_machine, arg_directory);
+ log_info("Spawning container %s on %s. Press ^] three times within 1s to abort execution.", arg_machine, arg_image ? arg_image : arg_directory);
if (unlockpt(master) < 0) {
log_error("Failed to unlock tty: %m");
assert_se(sigprocmask(SIG_BLOCK, &mask, NULL) == 0);
for (;;) {
+ int parent_ready_fd = -1, child_ready_fd = -1;
siginfo_t status;
+ eventfd_t x;
- sync_fd = eventfd(0, EFD_CLOEXEC);
- if (sync_fd < 0) {
+ parent_ready_fd = eventfd(0, EFD_CLOEXEC);
+ if (parent_ready_fd < 0) {
+ log_error("Failed to create event fd: %m");
+ goto finish;
+ }
+
+ child_ready_fd = eventfd(0, EFD_CLOEXEC);
+ if (child_ready_fd < 0) {
log_error("Failed to create event fd: %m");
goto finish;
}
if (pid == 0) {
/* child */
- const char *home = NULL;
- uid_t uid = (uid_t) -1;
- gid_t gid = (gid_t) -1;
+ _cleanup_free_ char *home = NULL;
unsigned n_env = 2;
const char *envp[] = {
"PATH=" DEFAULT_PATH_SPLIT_USR,
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;
+ master = safe_close(master);
close_nointr(STDIN_FILENO);
close_nointr(STDOUT_FILENO);
close_nointr(STDERR_FILENO);
- close_nointr_nofail(kmsg_socket_pair[0]);
- kmsg_socket_pair[0] = -1;
+ kmsg_socket_pair[0] = safe_close(kmsg_socket_pair[0]);
reset_all_signal_handlers();
k = open_terminal(console, O_RDWR);
if (k != STDIN_FILENO) {
if (k >= 0) {
- close_nointr_nofail(k);
+ safe_close(k);
k = -EINVAL;
}
goto child_fail;
}
+ if (mount_devices(arg_directory,
+ root_device, root_device_rw,
+ home_device, home_device_rw,
+ srv_device, srv_device_rw) < 0)
+ 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.");
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;
+ kmsg_socket_pair[1] = safe_close(kmsg_socket_pair[1]);
if (setup_boot_id(arg_directory) < 0)
goto child_fail;
if (setup_kdbus(arg_directory, kdbus_domain) < 0)
goto child_fail;
+ /* Tell the parent that we are ready, and that
+ * it can cgroupify us to that we lack access
+ * to certain devices and resources. */
+ eventfd_write(child_ready_fd, 1);
+ child_ready_fd = safe_close(child_ready_fd);
+
if (chdir(arg_directory) < 0) {
log_error("chdir(%s) failed: %m", arg_directory);
goto child_fail;
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;
- }
- }
+ r = change_uid_gid(&home);
+ if (r < 0)
+ 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) ||
log_error("personality() failed: %m");
goto child_fail;
}
+ } else if (secondary) {
+ if (personality(PER_LINUX32) < 0) {
+ log_error("personality() failed: %m");
+ goto child_fail;
+ }
}
- eventfd_read(sync_fd, &x);
- close_nointr_nofail(sync_fd);
- sync_fd = -1;
+#ifdef HAVE_SELINUX
+ if (arg_selinux_context)
+ if (setexeccon((security_context_t) arg_selinux_context) < 0) {
+ log_error("setexeccon(\"%s\") failed: %m", arg_selinux_context);
+ goto child_fail;
+ }
+#endif
if (!strv_isempty(arg_setenv)) {
char **n;
} else
env_use = (char**) envp;
-#ifdef HAVE_SELINUX
- if (arg_selinux_context)
- if (setexeccon((security_context_t) arg_selinux_context) < 0)
- log_error("setexeccon(\"%s\") failed: %m", arg_selinux_context);
-#endif
+ /* Wait until the parent is ready with the setup, too... */
+ eventfd_read(parent_ready_fd, &x);
+ parent_ready_fd = safe_close(parent_ready_fd);
+
if (arg_boot) {
char **a;
size_t l;
fdset_free(fds);
fds = NULL;
+ /* Wait until the child reported that it is ready with
+ * all it needs to do with priviliges. After we got
+ * the notification we can make the process join its
+ * cgroup which might limit what it can do */
+ eventfd_read(child_ready_fd, &x);
+
r = register_machine(pid);
if (r < 0)
goto finish;
if (r < 0)
goto finish;
- eventfd_write(sync_fd, 1);
- close_nointr_nofail(sync_fd);
- sync_fd = -1;
+ /* Notify the child that the parent is ready with all
+ * its setup, and thtat the child can now hand over
+ * control to the code to run inside the container. */
+ eventfd_write(parent_ready_fd, 1);
k = process_pty(master, &mask, arg_boot ? pid : 0, SIGRTMIN+3);
if (k < 0) {
}
finish:
+ loop_remove(loop_nr, &image_fd);
+
if (pid > 0)
kill(pid, SIGKILL);
~ianmdlvl / elogind.git / blobdiff