summaryrefslogtreecommitdiff
path: root/src/core/namespace.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/core/namespace.c')
-rw-r--r--src/core/namespace.c330
1 files changed, 0 insertions, 330 deletions
diff --git a/src/core/namespace.c b/src/core/namespace.c
deleted file mode 100644
index ba18ddc5b0..0000000000
--- a/src/core/namespace.c
+++ /dev/null
@@ -1,330 +0,0 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- 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 <sys/mount.h>
-#include <string.h>
-#include <stdio.h>
-#include <unistd.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <sched.h>
-#include <sys/syscall.h>
-#include <limits.h>
-#include <linux/fs.h>
-
-#include "strv.h"
-#include "util.h"
-#include "path-util.h"
-#include "namespace.h"
-#include "missing.h"
-
-typedef enum PathMode {
- /* This is ordered by priority! */
- INACCESSIBLE,
- READONLY,
- PRIVATE_TMP,
- PRIVATE_VAR_TMP,
- READWRITE
-} PathMode;
-
-typedef struct Path {
- const char *path;
- PathMode mode;
- bool done;
-} Path;
-
-static int append_paths(Path **p, char **strv, PathMode mode) {
- char **i;
-
- STRV_FOREACH(i, strv) {
-
- if (!path_is_absolute(*i))
- return -EINVAL;
-
- (*p)->path = *i;
- (*p)->mode = mode;
- (*p)++;
- }
-
- return 0;
-}
-
-static int path_compare(const void *a, const void *b) {
- const Path *p = a, *q = b;
-
- if (path_equal(p->path, q->path)) {
-
- /* 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 */
- if (path_startswith(p->path, q->path))
- return 1;
-
- if (path_startswith(q->path, p->path))
- return -1;
-
- return 0;
-}
-
-static void drop_duplicates(Path *p, unsigned *n, bool *need_inaccessible) {
- Path *f, *t, *previous;
-
- assert(p);
- assert(n);
- assert(need_inaccessible);
-
- for (f = p, t = p, previous = NULL; f < p+*n; f++) {
-
- /* The first one wins */
- if (previous && path_equal(f->path, previous->path))
- continue;
-
- t->path = f->path;
- t->mode = f->mode;
-
- if (t->mode == INACCESSIBLE)
- *need_inaccessible = true;
-
- previous = t;
-
- t++;
- }
-
- *n = t - p;
-}
-
-static int apply_mount(
- Path *p,
- const char *tmp_dir,
- const char *var_tmp_dir,
- const char *inaccessible_dir) {
-
- const char *what;
- int r;
-
- assert(p);
-
- switch (p->mode) {
-
- case INACCESSIBLE:
- what = inaccessible_dir;
- break;
-
- case READONLY:
- case READWRITE:
- what = p->path;
- break;
-
- case PRIVATE_TMP:
- what = tmp_dir;
- break;
-
- case PRIVATE_VAR_TMP:
- what = var_tmp_dir;
- break;
-
- default:
- assert_not_reached("Unknown mode");
- }
-
- assert(what);
-
- r = mount(what, p->path, NULL, MS_BIND|MS_REC, NULL);
- if (r >= 0)
- log_debug("Successfully mounted %s to %s", what, p->path);
-
- return r;
-}
-
-static int make_read_only(Path *p) {
- int r;
-
- assert(p);
-
- if (p->mode != INACCESSIBLE && p->mode != READONLY)
- return 0;
-
- r = mount(NULL, p->path, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY|MS_REC, NULL);
- if (r < 0)
- return -errno;
-
- return 0;
-}
-
-int setup_namespace(
- char **writable,
- char **readable,
- char **inaccessible,
- bool private_tmp,
- unsigned long flags) {
-
- char
- tmp_dir[] = "/tmp/systemd-private-XXXXXX",
- var_tmp_dir[] = "/var/tmp/systemd-private-XXXXXX",
- inaccessible_dir[] = "/tmp/systemd-inaccessible-XXXXXX";
-
- Path *paths, *p;
- unsigned n;
- bool need_inaccessible = false;
- bool remove_tmp = false, remove_var_tmp = false, remove_inaccessible = false;
- int r;
-
- if (!flags)
- flags = MS_SHARED;
-
- n =
- strv_length(writable) +
- strv_length(readable) +
- strv_length(inaccessible) +
- (private_tmp ? 2 : 0);
-
- p = paths = alloca(sizeof(Path) * n);
- if ((r = append_paths(&p, writable, READWRITE)) < 0 ||
- (r = append_paths(&p, readable, READONLY)) < 0 ||
- (r = append_paths(&p, inaccessible, INACCESSIBLE)) < 0)
- goto fail;
-
- if (private_tmp) {
- p->path = "/tmp";
- p->mode = PRIVATE_TMP;
- p++;
-
- p->path = "/var/tmp";
- p->mode = PRIVATE_VAR_TMP;
- p++;
- }
-
- assert(paths + n == p);
-
- qsort(paths, n, sizeof(Path), path_compare);
- drop_duplicates(paths, &n, &need_inaccessible);
-
- if (need_inaccessible) {
- mode_t u;
- char *d;
-
- u = umask(0777);
- d = mkdtemp(inaccessible_dir);
- umask(u);
-
- if (!d) {
- r = -errno;
- goto fail;
- }
-
- remove_inaccessible = true;
- }
-
- if (private_tmp) {
- mode_t u;
- char *d;
-
- u = umask(0000);
- d = mkdtemp(tmp_dir);
- umask(u);
-
- if (!d) {
- r = -errno;
- goto fail;
- }
-
- remove_tmp = true;
-
- u = umask(0000);
- d = mkdtemp(var_tmp_dir);
- umask(u);
-
- if (!d) {
- r = -errno;
- goto fail;
- }
-
- remove_var_tmp = true;
-
- if (chmod(tmp_dir, 0777 + S_ISVTX) < 0) {
- r = -errno;
- goto fail;
- }
-
- if (chmod(var_tmp_dir, 0777 + S_ISVTX) < 0) {
- r = -errno;
- goto fail;
- }
- }
-
- if (unshare(CLONE_NEWNS) < 0) {
- r = -errno;
- goto fail;
- }
-
- /* 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) {
- r = -errno;
- goto fail;
- }
-
- for (p = paths; p < paths + n; p++) {
- r = apply_mount(p, tmp_dir, var_tmp_dir, inaccessible_dir);
- if (r < 0)
- goto undo_mounts;
- }
-
- for (p = paths; p < paths + n; p++) {
- r = make_read_only(p);
- if (r < 0)
- goto undo_mounts;
- }
-
- /* Remount / as the desired mode */
- if (mount(NULL, "/", NULL, flags|MS_REC, NULL) < 0) {
- r = -errno;
- goto undo_mounts;
- }
-
- return 0;
-
-undo_mounts:
- for (p = paths; p < paths + n; p++)
- if (p->done)
- umount2(p->path, MNT_DETACH);
-
-fail:
- if (remove_inaccessible)
- rmdir(inaccessible_dir);
-
- if (remove_tmp)
- rmdir(tmp_dir);
-
- if (remove_var_tmp)
- rmdir(var_tmp_dir);
-
- return r;
-}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-23 04:39:45 +0000