729 lines
21 KiB
C
729 lines
21 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 <errno.h>
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#include <sched.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <linux/fs.h>
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#include "dev-setup.h"
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#include "fd-util.h"
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#include "loopback-setup.h"
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#include "missing.h"
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#include "mkdir.h"
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#include "mount-util.h"
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#include "namespace.h"
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#include "path-util.h"
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#include "selinux-util.h"
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#include "socket-util.h"
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#include "string-table.h"
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#include "string-util.h"
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#include "strv.h"
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#include "umask-util.h"
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#include "user-util.h"
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#include "util.h"
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typedef enum MountMode {
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/* This is ordered by priority! */
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INACCESSIBLE,
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READONLY,
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PRIVATE_TMP,
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PRIVATE_VAR_TMP,
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PRIVATE_DEV,
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PRIVATE_BUS_ENDPOINT,
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READWRITE
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} MountMode;
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typedef struct BindMount {
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const char *path;
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MountMode mode;
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bool done;
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bool ignore;
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} BindMount;
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static int append_mounts(BindMount **p, char **strv, MountMode mode) {
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char **i;
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assert(p);
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STRV_FOREACH(i, strv) {
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(*p)->ignore = false;
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(*p)->done = false;
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if ((mode == INACCESSIBLE || mode == READONLY || mode == READWRITE) && (*i)[0] == '-') {
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(*p)->ignore = true;
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(*i)++;
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}
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if (!path_is_absolute(*i))
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return -EINVAL;
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(*p)->path = *i;
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(*p)->mode = mode;
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(*p)++;
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}
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return 0;
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}
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static int mount_path_compare(const void *a, const void *b) {
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const BindMount *p = a, *q = b;
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int d;
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d = path_compare(p->path, q->path);
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if (d == 0) {
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/* If the paths are equal, check the mode */
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if (p->mode < q->mode)
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return -1;
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if (p->mode > q->mode)
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return 1;
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return 0;
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}
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/* If the paths are not equal, then order prefixes first */
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return d;
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}
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static void drop_duplicates(BindMount *m, unsigned *n) {
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BindMount *f, *t, *previous;
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assert(m);
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assert(n);
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for (f = m, t = m, previous = NULL; f < m+*n; f++) {
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/* The first one wins */
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if (previous && path_equal(f->path, previous->path))
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continue;
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*t = *f;
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previous = t;
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t++;
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}
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*n = t - m;
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}
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static int mount_dev(BindMount *m) {
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static const char devnodes[] =
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"/dev/null\0"
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"/dev/zero\0"
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"/dev/full\0"
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"/dev/random\0"
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"/dev/urandom\0"
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"/dev/tty\0";
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char temporary_mount[] = "/tmp/namespace-dev-XXXXXX";
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const char *d, *dev = NULL, *devpts = NULL, *devshm = NULL, *devhugepages = NULL, *devmqueue = NULL, *devlog = NULL, *devptmx = NULL;
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_cleanup_umask_ mode_t u;
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int r;
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assert(m);
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u = umask(0000);
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if (!mkdtemp(temporary_mount))
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return -errno;
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dev = strjoina(temporary_mount, "/dev");
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(void) mkdir(dev, 0755);
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if (mount("tmpfs", dev, "tmpfs", MS_NOSUID|MS_STRICTATIME, "mode=755") < 0) {
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r = -errno;
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goto fail;
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}
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devpts = strjoina(temporary_mount, "/dev/pts");
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(void) mkdir(devpts, 0755);
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if (mount("/dev/pts", devpts, NULL, MS_BIND, NULL) < 0) {
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r = -errno;
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goto fail;
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}
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devptmx = strjoina(temporary_mount, "/dev/ptmx");
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if (symlink("pts/ptmx", devptmx) < 0) {
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r = -errno;
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goto fail;
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}
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devshm = strjoina(temporary_mount, "/dev/shm");
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(void) mkdir(devshm, 01777);
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r = mount("/dev/shm", devshm, NULL, MS_BIND, NULL);
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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devmqueue = strjoina(temporary_mount, "/dev/mqueue");
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(void) mkdir(devmqueue, 0755);
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(void) mount("/dev/mqueue", devmqueue, NULL, MS_BIND, NULL);
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devhugepages = strjoina(temporary_mount, "/dev/hugepages");
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(void) mkdir(devhugepages, 0755);
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(void) mount("/dev/hugepages", devhugepages, NULL, MS_BIND, NULL);
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devlog = strjoina(temporary_mount, "/dev/log");
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(void) symlink("/run/systemd/journal/dev-log", devlog);
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NULSTR_FOREACH(d, devnodes) {
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_cleanup_free_ char *dn = NULL;
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struct stat st;
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r = stat(d, &st);
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if (r < 0) {
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if (errno == ENOENT)
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continue;
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r = -errno;
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goto fail;
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}
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if (!S_ISBLK(st.st_mode) &&
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!S_ISCHR(st.st_mode)) {
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r = -EINVAL;
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goto fail;
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}
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if (st.st_rdev == 0)
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continue;
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dn = strappend(temporary_mount, d);
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if (!dn) {
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r = -ENOMEM;
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goto fail;
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}
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mac_selinux_create_file_prepare(d, st.st_mode);
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r = mknod(dn, st.st_mode, st.st_rdev);
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mac_selinux_create_file_clear();
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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}
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dev_setup(temporary_mount, UID_INVALID, GID_INVALID);
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/* Create the /dev directory if missing. It is more likely to be
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* missing when the service is started with RootDirectory. This is
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* consistent with mount units creating the mount points when missing.
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*/
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(void) mkdir_p_label(m->path, 0755);
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if (mount(dev, m->path, NULL, MS_MOVE, NULL) < 0) {
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r = -errno;
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goto fail;
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}
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rmdir(dev);
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rmdir(temporary_mount);
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return 0;
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fail:
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if (devpts)
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umount(devpts);
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if (devshm)
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umount(devshm);
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if (devhugepages)
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umount(devhugepages);
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if (devmqueue)
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umount(devmqueue);
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umount(dev);
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rmdir(dev);
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rmdir(temporary_mount);
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return r;
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}
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static int mount_kdbus(BindMount *m) {
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char temporary_mount[] = "/tmp/kdbus-dev-XXXXXX";
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_cleanup_free_ char *basepath = NULL;
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_cleanup_umask_ mode_t u;
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char *busnode = NULL, *root;
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struct stat st;
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int r;
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assert(m);
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u = umask(0000);
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if (!mkdtemp(temporary_mount))
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return log_error_errno(errno, "Failed create temp dir: %m");
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root = strjoina(temporary_mount, "/kdbus");
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(void) mkdir(root, 0755);
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if (mount("tmpfs", root, "tmpfs", MS_NOSUID|MS_STRICTATIME, "mode=777") < 0) {
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r = -errno;
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goto fail;
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}
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/* create a new /dev/null dev node copy so we have some fodder to
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* bind-mount the custom endpoint over. */
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if (stat("/dev/null", &st) < 0) {
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r = log_error_errno(errno, "Failed to stat /dev/null: %m");
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goto fail;
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}
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busnode = strjoina(root, "/bus");
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if (mknod(busnode, (st.st_mode & ~07777) | 0600, st.st_rdev) < 0) {
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r = log_error_errno(errno, "mknod() for %s failed: %m",
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busnode);
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goto fail;
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}
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r = mount(m->path, busnode, NULL, MS_BIND, NULL);
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if (r < 0) {
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r = log_error_errno(errno, "bind mount of %s failed: %m",
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m->path);
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goto fail;
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}
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basepath = dirname_malloc(m->path);
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if (!basepath) {
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r = -ENOMEM;
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goto fail;
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}
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if (mount(root, basepath, NULL, MS_MOVE, NULL) < 0) {
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r = log_error_errno(errno, "bind mount of %s failed: %m",
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basepath);
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goto fail;
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}
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rmdir(temporary_mount);
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return 0;
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fail:
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if (busnode) {
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umount(busnode);
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unlink(busnode);
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}
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umount(root);
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rmdir(root);
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rmdir(temporary_mount);
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return r;
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}
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static int apply_mount(
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BindMount *m,
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const char *tmp_dir,
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const char *var_tmp_dir) {
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const char *what;
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int r;
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assert(m);
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switch (m->mode) {
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case INACCESSIBLE:
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/* First, get rid of everything that is below if there
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* is anything... Then, overmount it with an
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* inaccessible directory. */
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umount_recursive(m->path, 0);
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what = "/run/systemd/inaccessible";
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break;
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case READONLY:
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case READWRITE:
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/* Nothing to mount here, we just later toggle the
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* MS_RDONLY bit for the mount point */
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return 0;
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case PRIVATE_TMP:
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what = tmp_dir;
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break;
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case PRIVATE_VAR_TMP:
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what = var_tmp_dir;
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break;
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case PRIVATE_DEV:
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return mount_dev(m);
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case PRIVATE_BUS_ENDPOINT:
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return mount_kdbus(m);
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default:
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assert_not_reached("Unknown mode");
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}
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assert(what);
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r = mount(what, m->path, NULL, MS_BIND|MS_REC, NULL);
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if (r >= 0)
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log_debug("Successfully mounted %s to %s", what, m->path);
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else if (m->ignore && errno == ENOENT)
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return 0;
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return r;
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}
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static int make_read_only(BindMount *m) {
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int r;
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assert(m);
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if (IN_SET(m->mode, INACCESSIBLE, READONLY))
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r = bind_remount_recursive(m->path, true);
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else if (IN_SET(m->mode, READWRITE, PRIVATE_TMP, PRIVATE_VAR_TMP, PRIVATE_DEV))
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r = bind_remount_recursive(m->path, false);
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else
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r = 0;
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if (m->ignore && r == -ENOENT)
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return 0;
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return r;
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}
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int setup_namespace(
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const char* root_directory,
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char** read_write_dirs,
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char** read_only_dirs,
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char** inaccessible_dirs,
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const char* tmp_dir,
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const char* var_tmp_dir,
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const char* bus_endpoint_path,
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bool private_dev,
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ProtectHome protect_home,
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ProtectSystem protect_system,
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unsigned long mount_flags) {
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BindMount *m, *mounts = NULL;
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unsigned n;
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int r = 0;
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if (mount_flags == 0)
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mount_flags = MS_SHARED;
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if (unshare(CLONE_NEWNS) < 0)
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return -errno;
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n = !!tmp_dir + !!var_tmp_dir + !!bus_endpoint_path +
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strv_length(read_write_dirs) +
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strv_length(read_only_dirs) +
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strv_length(inaccessible_dirs) +
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private_dev +
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(protect_home != PROTECT_HOME_NO ? 3 : 0) +
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(protect_system != PROTECT_SYSTEM_NO ? 2 : 0) +
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(protect_system == PROTECT_SYSTEM_FULL ? 1 : 0);
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if (n > 0) {
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m = mounts = (BindMount *) alloca0(n * sizeof(BindMount));
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r = append_mounts(&m, read_write_dirs, READWRITE);
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if (r < 0)
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return r;
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r = append_mounts(&m, read_only_dirs, READONLY);
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if (r < 0)
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return r;
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r = append_mounts(&m, inaccessible_dirs, INACCESSIBLE);
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if (r < 0)
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return r;
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if (tmp_dir) {
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m->path = prefix_roota(root_directory, "/tmp");
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m->mode = PRIVATE_TMP;
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m++;
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}
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if (var_tmp_dir) {
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m->path = prefix_roota(root_directory, "/var/tmp");
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m->mode = PRIVATE_VAR_TMP;
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m++;
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}
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if (private_dev) {
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m->path = prefix_roota(root_directory, "/dev");
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m->mode = PRIVATE_DEV;
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m++;
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}
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if (bus_endpoint_path) {
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m->path = prefix_roota(root_directory, bus_endpoint_path);
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m->mode = PRIVATE_BUS_ENDPOINT;
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m++;
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}
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if (protect_home != PROTECT_HOME_NO) {
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const char *home_dir, *run_user_dir, *root_dir;
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home_dir = prefix_roota(root_directory, "/home");
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home_dir = strjoina("-", home_dir);
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run_user_dir = prefix_roota(root_directory, "/run/user");
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run_user_dir = strjoina("-", run_user_dir);
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root_dir = prefix_roota(root_directory, "/root");
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root_dir = strjoina("-", root_dir);
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r = append_mounts(&m, STRV_MAKE(home_dir, run_user_dir, root_dir),
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protect_home == PROTECT_HOME_READ_ONLY ? READONLY : INACCESSIBLE);
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if (r < 0)
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return r;
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}
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if (protect_system != PROTECT_SYSTEM_NO) {
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const char *usr_dir, *boot_dir, *etc_dir;
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usr_dir = prefix_roota(root_directory, "/usr");
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boot_dir = prefix_roota(root_directory, "/boot");
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boot_dir = strjoina("-", boot_dir);
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etc_dir = prefix_roota(root_directory, "/etc");
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r = append_mounts(&m, protect_system == PROTECT_SYSTEM_FULL
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? STRV_MAKE(usr_dir, boot_dir, etc_dir)
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: STRV_MAKE(usr_dir, boot_dir), READONLY);
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if (r < 0)
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return r;
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}
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assert(mounts + n == m);
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qsort(mounts, n, sizeof(BindMount), mount_path_compare);
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drop_duplicates(mounts, &n);
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}
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if (n > 0 || root_directory) {
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/* Remount / as SLAVE so that nothing now mounted in the namespace
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shows up in the parent */
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if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL) < 0)
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return -errno;
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}
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if (root_directory) {
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/* Turn directory into bind mount */
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if (mount(root_directory, root_directory, NULL, MS_BIND|MS_REC, NULL) < 0)
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return -errno;
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}
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if (n > 0) {
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for (m = mounts; m < mounts + n; ++m) {
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r = apply_mount(m, tmp_dir, var_tmp_dir);
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if (r < 0)
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goto fail;
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}
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for (m = mounts; m < mounts + n; ++m) {
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r = make_read_only(m);
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if (r < 0)
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goto fail;
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}
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}
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if (root_directory) {
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/* MS_MOVE does not work on MS_SHARED so the remount MS_SHARED will be done later */
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r = mount_move_root(root_directory);
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/* at this point, we cannot rollback */
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if (r < 0)
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return r;
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}
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/* Remount / as the desired mode. Not that this will not
|
|
* reestablish propagation from our side to the host, since
|
|
* what's disconnected is disconnected. */
|
|
if (mount(NULL, "/", NULL, mount_flags | MS_REC, NULL) < 0)
|
|
/* at this point, we cannot rollback */
|
|
return -errno;
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
if (n > 0) {
|
|
for (m = mounts; m < mounts + n; ++m)
|
|
if (m->done)
|
|
(void) umount2(m->path, MNT_DETACH);
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static int setup_one_tmp_dir(const char *id, const char *prefix, char **path) {
|
|
_cleanup_free_ char *x = NULL;
|
|
char bid[SD_ID128_STRING_MAX];
|
|
sd_id128_t boot_id;
|
|
int r;
|
|
|
|
assert(id);
|
|
assert(prefix);
|
|
assert(path);
|
|
|
|
/* We include the boot id in the directory so that after a
|
|
* reboot we can easily identify obsolete directories. */
|
|
|
|
r = sd_id128_get_boot(&boot_id);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
x = strjoin(prefix, "/systemd-private-", sd_id128_to_string(boot_id, bid), "-", id, "-XXXXXX", NULL);
|
|
if (!x)
|
|
return -ENOMEM;
|
|
|
|
RUN_WITH_UMASK(0077)
|
|
if (!mkdtemp(x))
|
|
return -errno;
|
|
|
|
RUN_WITH_UMASK(0000) {
|
|
char *y;
|
|
|
|
y = strjoina(x, "/tmp");
|
|
|
|
if (mkdir(y, 0777 | S_ISVTX) < 0)
|
|
return -errno;
|
|
}
|
|
|
|
*path = x;
|
|
x = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int setup_tmp_dirs(const char *id, char **tmp_dir, char **var_tmp_dir) {
|
|
char *a, *b;
|
|
int r;
|
|
|
|
assert(id);
|
|
assert(tmp_dir);
|
|
assert(var_tmp_dir);
|
|
|
|
r = setup_one_tmp_dir(id, "/tmp", &a);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = setup_one_tmp_dir(id, "/var/tmp", &b);
|
|
if (r < 0) {
|
|
char *t;
|
|
|
|
t = strjoina(a, "/tmp");
|
|
rmdir(t);
|
|
rmdir(a);
|
|
|
|
free(a);
|
|
return r;
|
|
}
|
|
|
|
*tmp_dir = a;
|
|
*var_tmp_dir = b;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int setup_netns(int netns_storage_socket[2]) {
|
|
_cleanup_close_ int netns = -1;
|
|
int r, q;
|
|
|
|
assert(netns_storage_socket);
|
|
assert(netns_storage_socket[0] >= 0);
|
|
assert(netns_storage_socket[1] >= 0);
|
|
|
|
/* We use the passed socketpair as a storage buffer for our
|
|
* namespace reference fd. Whatever process runs this first
|
|
* shall create a new namespace, all others should just join
|
|
* it. To serialize that we use a file lock on the socket
|
|
* pair.
|
|
*
|
|
* It's a bit crazy, but hey, works great! */
|
|
|
|
if (lockf(netns_storage_socket[0], F_LOCK, 0) < 0)
|
|
return -errno;
|
|
|
|
netns = receive_one_fd(netns_storage_socket[0], MSG_DONTWAIT);
|
|
if (netns == -EAGAIN) {
|
|
/* Nothing stored yet, so let's create a new namespace */
|
|
|
|
if (unshare(CLONE_NEWNET) < 0) {
|
|
r = -errno;
|
|
goto fail;
|
|
}
|
|
|
|
loopback_setup();
|
|
|
|
netns = open("/proc/self/ns/net", O_RDONLY|O_CLOEXEC|O_NOCTTY);
|
|
if (netns < 0) {
|
|
r = -errno;
|
|
goto fail;
|
|
}
|
|
|
|
r = 1;
|
|
|
|
} else if (netns < 0) {
|
|
r = netns;
|
|
goto fail;
|
|
|
|
} else {
|
|
/* Yay, found something, so let's join the namespace */
|
|
if (setns(netns, CLONE_NEWNET) < 0) {
|
|
r = -errno;
|
|
goto fail;
|
|
}
|
|
|
|
r = 0;
|
|
}
|
|
|
|
q = send_one_fd(netns_storage_socket[1], netns, MSG_DONTWAIT);
|
|
if (q < 0) {
|
|
r = q;
|
|
goto fail;
|
|
}
|
|
|
|
fail:
|
|
lockf(netns_storage_socket[0], F_ULOCK, 0);
|
|
return r;
|
|
}
|
|
|
|
static const char *const protect_home_table[_PROTECT_HOME_MAX] = {
|
|
[PROTECT_HOME_NO] = "no",
|
|
[PROTECT_HOME_YES] = "yes",
|
|
[PROTECT_HOME_READ_ONLY] = "read-only",
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(protect_home, ProtectHome);
|
|
|
|
static const char *const protect_system_table[_PROTECT_SYSTEM_MAX] = {
|
|
[PROTECT_SYSTEM_NO] = "no",
|
|
[PROTECT_SYSTEM_YES] = "yes",
|
|
[PROTECT_SYSTEM_FULL] = "full",
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(protect_system, ProtectSystem);
|