stuff

1 files changed, 0 insertions, 650 deletions

diff --git a/src/libcore/namespace.c b/src/libcore/namespace.c
deleted file mode 100644
index f7c5364437..0000000000
--- a/src/libcore/namespace.c
+++ /dev/null
@@ -1,650 +0,0 @@
-/***
-  This file is part of systemd.
-
-  Copyright 2010 Lennart Poettering
-
-  systemd is free software; you can redistribute it and/or modify it
-  under the terms of the GNU Lesser General Public License as published by
-  the Free Software Foundation; either version 2.1 of the License, or
-  (at your option) any later version.
-
-  systemd is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-  Lesser General Public License for more details.
-
-  You should have received a copy of the GNU Lesser General Public License
-  along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <errno.h>
-#include <sched.h>
-#include <stdio.h>
-#include <string.h>
-#include <sys/mount.h>
-#include <sys/stat.h>
-#include <unistd.h>
-#include <linux/fs.h>
-
-#include "basic/alloc-util.h"
-#include "shared/dev-setup.h"
-#include "basic/fd-util.h"
-#include "loopback-setup.h"
-#include "basic/missing.h"
-#include "basic/mkdir.h"
-#include "basic/mount-util.h"
-#include "namespace.h"
-#include "basic/path-util.h"
-#include "basic/selinux-util.h"
-#include "basic/socket-util.h"
-#include "basic/string-table.h"
-#include "basic/string-util.h"
-#include "basic/strv.h"
-#include "basic/umask-util.h"
-#include "basic/user-util.h"
-#include "basic/util.h"
-
-#define DEV_MOUNT_OPTIONS (MS_NOSUID|MS_STRICTATIME|MS_NOEXEC)
-
-typedef enum MountMode {
-        /* This is ordered by priority! */
-        INACCESSIBLE,
-        READONLY,
-        PRIVATE_TMP,
-        PRIVATE_VAR_TMP,
-        PRIVATE_DEV,
-        READWRITE
-} MountMode;
-
-typedef struct BindMount {
-        const char *path;
-        MountMode mode;
-        bool done;
-        bool ignore;
-} BindMount;
-
-static int append_mounts(BindMount **p, char **strv, MountMode mode) {
-        char **i;
-
-        assert(p);
-
-        STRV_FOREACH(i, strv) {
-
-                (*p)->ignore = false;
-                (*p)->done = false;
-
-                if ((mode == INACCESSIBLE || mode == READONLY || mode == READWRITE) && (*i)[0] == '-') {
-                        (*p)->ignore = true;
-                        (*i)++;
-                }
-
-                if (!path_is_absolute(*i))
-                        return -EINVAL;
-
-                (*p)->path = *i;
-                (*p)->mode = mode;
-                (*p)++;
-        }
-
-        return 0;
-}
-
-static int mount_path_compare(const void *a, const void *b) {
-        const BindMount *p = a, *q = b;
-        int d;
-
-        d = path_compare(p->path, q->path);
-
-        if (d == 0) {
-                /* If the paths are equal, check the mode */
-                if (p->mode < q->mode)
-                        return -1;
-
-                if (p->mode > q->mode)
-                        return 1;
-
-                return 0;
-        }
-
-        /* If the paths are not equal, then order prefixes first */
-        return d;
-}
-
-static void drop_duplicates(BindMount *m, unsigned *n) {
-        BindMount *f, *t, *previous;
-
-        assert(m);
-        assert(n);
-
-        for (f = m, t = m, previous = NULL; f < m+*n; f++) {
-
-                /* The first one wins */
-                if (previous && path_equal(f->path, previous->path))
-                        continue;
-
-                *t = *f;
-
-                previous = t;
-
-                t++;
-        }
-
-        *n = t - m;
-}
-
-static int mount_dev(BindMount *m) {
-        static const char devnodes[] =
-                "/dev/null\0"
-                "/dev/zero\0"
-                "/dev/full\0"
-                "/dev/random\0"
-                "/dev/urandom\0"
-                "/dev/tty\0";
-
-        char temporary_mount[] = "/tmp/namespace-dev-XXXXXX";
-        const char *d, *dev = NULL, *devpts = NULL, *devshm = NULL, *devhugepages = NULL, *devmqueue = NULL, *devlog = NULL, *devptmx = NULL;
-        _cleanup_umask_ mode_t u;
-        int r;
-
-        assert(m);
-
-        u = umask(0000);
-
-        if (!mkdtemp(temporary_mount))
-                return -errno;
-
-        dev = strjoina(temporary_mount, "/dev");
-        (void) mkdir(dev, 0755);
-        if (mount("tmpfs", dev, "tmpfs", DEV_MOUNT_OPTIONS, "mode=755") < 0) {
-                r = -errno;
-                goto fail;
-        }
-
-        devpts = strjoina(temporary_mount, "/dev/pts");
-        (void) mkdir(devpts, 0755);
-        if (mount("/dev/pts", devpts, NULL, MS_BIND, NULL) < 0) {
-                r = -errno;
-                goto fail;
-        }
-
-        devptmx = strjoina(temporary_mount, "/dev/ptmx");
-        if (symlink("pts/ptmx", devptmx) < 0) {
-                r = -errno;
-                goto fail;
-        }
-
-        devshm = strjoina(temporary_mount, "/dev/shm");
-        (void) mkdir(devshm, 01777);
-        r = mount("/dev/shm", devshm, NULL, MS_BIND, NULL);
-        if (r < 0) {
-                r = -errno;
-                goto fail;
-        }
-
-        devmqueue = strjoina(temporary_mount, "/dev/mqueue");
-        (void) mkdir(devmqueue, 0755);
-        (void) mount("/dev/mqueue", devmqueue, NULL, MS_BIND, NULL);
-
-        devhugepages = strjoina(temporary_mount, "/dev/hugepages");
-        (void) mkdir(devhugepages, 0755);
-        (void) mount("/dev/hugepages", devhugepages, NULL, MS_BIND, NULL);
-
-        devlog = strjoina(temporary_mount, "/dev/log");
-        (void) symlink("/run/systemd/journal/dev-log", devlog);
-
-        NULSTR_FOREACH(d, devnodes) {
-                _cleanup_free_ char *dn = NULL;
-                struct stat st;
-
-                r = stat(d, &st);
-                if (r < 0) {
-
-                        if (errno == ENOENT)
-                                continue;
-
-                        r = -errno;
-                        goto fail;
-                }
-
-                if (!S_ISBLK(st.st_mode) &&
-                    !S_ISCHR(st.st_mode)) {
-                        r = -EINVAL;
-                        goto fail;
-                }
-
-                if (st.st_rdev == 0)
-                        continue;
-
-                dn = strappend(temporary_mount, d);
-                if (!dn) {
-                        r = -ENOMEM;
-                        goto fail;
-                }
-
-                mac_selinux_create_file_prepare(d, st.st_mode);
-                r = mknod(dn, st.st_mode, st.st_rdev);
-                mac_selinux_create_file_clear();
-
-                if (r < 0) {
-                        r = -errno;
-                        goto fail;
-                }
-        }
-
-        dev_setup(temporary_mount, UID_INVALID, GID_INVALID);
-
-        /* Create the /dev directory if missing. It is more likely to be
-         * missing when the service is started with RootDirectory. This is
-         * consistent with mount units creating the mount points when missing.
-         */
-        (void) mkdir_p_label(m->path, 0755);
-
-        /* Unmount everything in old /dev */
-        umount_recursive(m->path, 0);
-        if (mount(dev, m->path, NULL, MS_MOVE, NULL) < 0) {
-                r = -errno;
-                goto fail;
-        }
-
-        rmdir(dev);
-        rmdir(temporary_mount);
-
-        return 0;
-
-fail:
-        if (devpts)
-                umount(devpts);
-
-        if (devshm)
-                umount(devshm);
-
-        if (devhugepages)
-                umount(devhugepages);
-
-        if (devmqueue)
-                umount(devmqueue);
-
-        umount(dev);
-        rmdir(dev);
-        rmdir(temporary_mount);
-
-        return r;
-}
-
-static int apply_mount(
-                BindMount *m,
-                const char *tmp_dir,
-                const char *var_tmp_dir) {
-
-        const char *what;
-        int r;
-
-        assert(m);
-
-        switch (m->mode) {
-
-        case INACCESSIBLE:
-
-                /* First, get rid of everything that is below if there
-                 * is anything... Then, overmount it with an
-                 * inaccessible directory. */
-                umount_recursive(m->path, 0);
-
-                what = "/run/systemd/inaccessible";
-                break;
-
-        case READONLY:
-        case READWRITE:
-                /* Nothing to mount here, we just later toggle the
-                 * MS_RDONLY bit for the mount point */
-                return 0;
-
-        case PRIVATE_TMP:
-                what = tmp_dir;
-                break;
-
-        case PRIVATE_VAR_TMP:
-                what = var_tmp_dir;
-                break;
-
-        case PRIVATE_DEV:
-                return mount_dev(m);
-
-        default:
-                assert_not_reached("Unknown mode");
-        }
-
-        assert(what);
-
-        r = mount(what, m->path, NULL, MS_BIND|MS_REC, NULL);
-        if (r >= 0)
-                log_debug("Successfully mounted %s to %s", what, m->path);
-        else if (m->ignore && errno == ENOENT)
-                return 0;
-
-        return r;
-}
-
-static int make_read_only(BindMount *m) {
-        int r;
-
-        assert(m);
-
-        if (IN_SET(m->mode, INACCESSIBLE, READONLY))
-                r = bind_remount_recursive(m->path, true);
-        else if (IN_SET(m->mode, READWRITE, PRIVATE_TMP, PRIVATE_VAR_TMP, PRIVATE_DEV)) {
-                r = bind_remount_recursive(m->path, false);
-                if (r == 0 && m->mode == PRIVATE_DEV) /* can be readonly but the submounts can't*/
-                        r = mount(NULL, m->path, NULL, MS_REMOUNT|DEV_MOUNT_OPTIONS|MS_RDONLY, NULL);
-        } else
-                r = 0;
-
-        if (m->ignore && r == -ENOENT)
-                return 0;
-
-        return r;
-}
-
-int setup_namespace(
-                const char* root_directory,
-                char** read_write_dirs,
-                char** read_only_dirs,
-                char** inaccessible_dirs,
-                const char* tmp_dir,
-                const char* var_tmp_dir,
-                bool private_dev,
-                ProtectHome protect_home,
-                ProtectSystem protect_system,
-                unsigned long mount_flags) {
-
-        BindMount *m, *mounts = NULL;
-        unsigned n;
-        int r = 0;
-
-        if (mount_flags == 0)
-                mount_flags = MS_SHARED;
-
-        if (unshare(CLONE_NEWNS) < 0)
-                return -errno;
-
-        n = !!tmp_dir + !!var_tmp_dir +
-                strv_length(read_write_dirs) +
-                strv_length(read_only_dirs) +
-                strv_length(inaccessible_dirs) +
-                private_dev +
-                (protect_home != PROTECT_HOME_NO ? 3 : 0) +
-                (protect_system != PROTECT_SYSTEM_NO ? 2 : 0) +
-                (protect_system == PROTECT_SYSTEM_FULL ? 1 : 0);
-
-        if (n > 0) {
-                m = mounts = (BindMount *) alloca0(n * sizeof(BindMount));
-                r = append_mounts(&m, read_write_dirs, READWRITE);
-                if (r < 0)
-                        return r;
-
-                r = append_mounts(&m, read_only_dirs, READONLY);
-                if (r < 0)
-                        return r;
-
-                r = append_mounts(&m, inaccessible_dirs, INACCESSIBLE);
-                if (r < 0)
-                        return r;
-
-                if (tmp_dir) {
-                        m->path = prefix_roota(root_directory, "/tmp");
-                        m->mode = PRIVATE_TMP;
-                        m++;
-                }
-
-                if (var_tmp_dir) {
-                        m->path = prefix_roota(root_directory, "/var/tmp");
-                        m->mode = PRIVATE_VAR_TMP;
-                        m++;
-                }
-
-                if (private_dev) {
-                        m->path = prefix_roota(root_directory, "/dev");
-                        m->mode = PRIVATE_DEV;
-                        m++;
-                }
-
-                if (protect_home != PROTECT_HOME_NO) {
-                        const char *home_dir, *run_user_dir, *root_dir;
-
-                        home_dir = prefix_roota(root_directory, "/home");
-                        home_dir = strjoina("-", home_dir);
-                        run_user_dir = prefix_roota(root_directory, "/run/user");
-                        run_user_dir = strjoina("-", run_user_dir);
-                        root_dir = prefix_roota(root_directory, "/root");
-                        root_dir = strjoina("-", root_dir);
-
-                        r = append_mounts(&m, STRV_MAKE(home_dir, run_user_dir, root_dir),
-                                protect_home == PROTECT_HOME_READ_ONLY ? READONLY : INACCESSIBLE);
-                        if (r < 0)
-                                return r;
-                }
-
-                if (protect_system != PROTECT_SYSTEM_NO) {
-                        const char *usr_dir, *boot_dir, *etc_dir;
-
-                        usr_dir = prefix_roota(root_directory, "/usr");
-                        boot_dir = prefix_roota(root_directory, "/boot");
-                        boot_dir = strjoina("-", boot_dir);
-                        etc_dir = prefix_roota(root_directory, "/etc");
-
-                        r = append_mounts(&m, protect_system == PROTECT_SYSTEM_FULL
-                                ? STRV_MAKE(usr_dir, boot_dir, etc_dir)
-                                : STRV_MAKE(usr_dir, boot_dir), READONLY);
-                        if (r < 0)
-                                return r;
-                }
-
-                assert(mounts + n == m);
-
-                qsort(mounts, n, sizeof(BindMount), mount_path_compare);
-                drop_duplicates(mounts, &n);
-        }
-
-        if (n > 0 || root_directory) {
-                /* Remount / as SLAVE so that nothing now mounted in the namespace
-                   shows up in the parent */
-                if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL) < 0)
-                        return -errno;
-        }
-
-        if (root_directory) {
-                /* Turn directory into bind mount */
-                if (mount(root_directory, root_directory, NULL, MS_BIND|MS_REC, NULL) < 0)
-                        return -errno;
-        }
-
-        if (n > 0) {
-                for (m = mounts; m < mounts + n; ++m) {
-                        r = apply_mount(m, tmp_dir, var_tmp_dir);
-                        if (r < 0)
-                                goto fail;
-                }
-
-                for (m = mounts; m < mounts + n; ++m) {
-                        r = make_read_only(m);
-                        if (r < 0)
-                                goto fail;
-                }
-        }
-
-        if (root_directory) {
-                /* MS_MOVE does not work on MS_SHARED so the remount MS_SHARED will be done later */
-                r = mount_move_root(root_directory);
-
-                /* at this point, we cannot rollback */
-                if (r < 0)
-                        return r;
-        }
-
-        /* 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);