nspawn: optionally fix up OS tree uid/gids for userns
This adds a new --private-userns-chown switch that may be used in combination with --private-userns. If it is passed a recursive chmod() operation is run on the OS tree, fixing all file owner UID/GIDs to the right ranges. This should make user namespacing pretty workable, as the OS trees don't need to be prepared manually anymore.
This commit is contained in:
Lennart Poettering
parent
6402d5c628
commit
7336138eed
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@ -240,6 +240,7 @@
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/test-ns
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/test-nss
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/test-parse-util
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/test-patch-uid
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/test-path
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/test-path-lookup
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/test-path-util
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13
Makefile.am
13
Makefile.am
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@ -3021,6 +3021,8 @@ systemd_nspawn_SOURCES = \
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src/nspawn/nspawn-setuid.h \
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src/nspawn/nspawn-stub-pid1.c \
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src/nspawn/nspawn-stub-pid1.h \
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src/nspawn/nspawn-patch-uid.c \
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src/nspawn/nspawn-patch-uid.h \
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src/core/mount-setup.c \
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src/core/mount-setup.h \
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src/core/loopback-setup.c \
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@ -3048,6 +3050,17 @@ systemd_nspawn_LDADD += \
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libfirewall.la
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endif
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test_patch_uid_SOURCES = \
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src/nspawn/nspawn-patch-uid.c \
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src/nspawn/nspawn-patch-uid.h \
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src/nspawn/test-patch-uid.c
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test_patch_uid_LDADD = \
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libshared.la
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manual_tests += \
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test-patch-uid
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# ------------------------------------------------------------------------------
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systemd_run_SOURCES = \
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src/run/run.c
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@ -0,0 +1,417 @@
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/***
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This file is part of systemd.
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Copyright 2016 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 <fcntl.h>
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#ifdef HAVE_ACL
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#include <sys/acl.h>
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#endif
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#include <sys/stat.h>
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#include <unistd.h>
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#include "acl-util.h"
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#include "dirent-util.h"
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#include "fd-util.h"
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#include "nspawn-patch-uid.h"
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#include "stdio-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "user-util.h"
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#ifdef HAVE_ACL
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static int get_acl(int fd, const char *name, acl_type_t type, acl_t *ret) {
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char procfs_path[strlen("/proc/self/fd/") + DECIMAL_STR_MAX(int) + 1];
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acl_t acl;
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assert(fd >= 0);
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assert(ret);
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if (name) {
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_cleanup_close_ int child_fd = -1;
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child_fd = openat(fd, name, O_PATH|O_CLOEXEC|O_NOFOLLOW);
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if (child_fd < 0)
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return -errno;
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xsprintf(procfs_path, "/proc/self/fd/%i", child_fd);
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acl = acl_get_file(procfs_path, type);
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} else if (type == ACL_TYPE_ACCESS)
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acl = acl_get_fd(fd);
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else {
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xsprintf(procfs_path, "/proc/self/fd/%i", fd);
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acl = acl_get_file(procfs_path, type);
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}
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if (!acl)
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return -errno;
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*ret = acl;
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return 0;
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}
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static int set_acl(int fd, const char *name, acl_type_t type, acl_t acl) {
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char procfs_path[strlen("/proc/self/fd/") + DECIMAL_STR_MAX(int) + 1];
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int r;
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assert(fd >= 0);
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assert(acl);
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if (name) {
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_cleanup_close_ int child_fd = -1;
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child_fd = openat(fd, name, O_PATH|O_CLOEXEC|O_NOFOLLOW);
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if (child_fd < 0)
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return -errno;
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xsprintf(procfs_path, "/proc/self/fd/%i", child_fd);
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r = acl_set_file(procfs_path, type, acl);
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} else if (type == ACL_TYPE_ACCESS)
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r = acl_set_fd(fd, acl);
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else {
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xsprintf(procfs_path, "/proc/self/fd/%i", fd);
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r = acl_set_file(procfs_path, type, acl);
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}
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if (r < 0)
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return -errno;
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return 0;
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}
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static int shift_acl(acl_t acl, uid_t shift, acl_t *ret) {
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_cleanup_(acl_freep) acl_t copy = NULL;
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acl_entry_t i;
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int r;
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assert(acl);
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assert(ret);
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r = acl_get_entry(acl, ACL_FIRST_ENTRY, &i);
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if (r < 0)
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return -errno;
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while (r > 0) {
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uid_t *old_uid, new_uid;
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bool modify = false;
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acl_tag_t tag;
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if (acl_get_tag_type(i, &tag) < 0)
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return -errno;
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if (IN_SET(tag, ACL_USER, ACL_GROUP)) {
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/* We don't distuingish here between uid_t and gid_t, let's make sure the compiler checks that
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* this is actually OK */
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assert_cc(sizeof(uid_t) == sizeof(gid_t));
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old_uid = acl_get_qualifier(i);
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if (!old_uid)
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return -errno;
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new_uid = shift | (*old_uid & UINT32_C(0xFFFF));
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if (!uid_is_valid(new_uid))
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return -EINVAL;
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modify = new_uid != *old_uid;
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if (modify && !copy) {
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int n;
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/* There's no copy of the ACL yet? if so, let's create one, and start the loop from the
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* beginning, so that we copy all entries, starting from the first, this time. */
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n = acl_entries(acl);
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if (n < 0)
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return -errno;
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copy = acl_init(n);
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if (!copy)
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return -errno;
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/* Seek back to the beginning */
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r = acl_get_entry(acl, ACL_FIRST_ENTRY, &i);
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if (r < 0)
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return -errno;
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continue;
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}
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}
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if (copy) {
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acl_entry_t new_entry;
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if (acl_create_entry(©, &new_entry) < 0)
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return -errno;
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if (acl_copy_entry(new_entry, i) < 0)
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return -errno;
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if (modify)
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if (acl_set_qualifier(new_entry, &new_uid) < 0)
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return -errno;
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}
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r = acl_get_entry(acl, ACL_NEXT_ENTRY, &i);
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if (r < 0)
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return -errno;
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}
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*ret = copy;
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copy = NULL;
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return !!*ret;
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}
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static int patch_acls(int fd, const char *name, const struct stat *st, uid_t shift) {
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_cleanup_(acl_freep) acl_t acl = NULL, shifted = NULL;
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bool changed = false;
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int r;
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assert(fd >= 0);
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assert(st);
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/* ACLs are not supported on symlinks, there's no point in trying */
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if (S_ISLNK(st->st_mode))
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return 0;
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r = get_acl(fd, name, ACL_TYPE_ACCESS, &acl);
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if (r == -EOPNOTSUPP)
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return 0;
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if (r < 0)
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return r;
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r = shift_acl(acl, shift, &shifted);
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if (r < 0)
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return r;
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if (r > 0) {
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r = set_acl(fd, name, ACL_TYPE_ACCESS, shifted);
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if (r < 0)
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return r;
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changed = true;
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}
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if (S_ISDIR(st->st_mode)) {
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acl_free(acl);
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acl_free(shifted);
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acl = shifted = NULL;
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r = get_acl(fd, name, ACL_TYPE_DEFAULT, &acl);
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if (r < 0)
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return r;
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r = shift_acl(acl, shift, &shifted);
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if (r < 0)
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return r;
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if (r > 0) {
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r = set_acl(fd, name, ACL_TYPE_DEFAULT, shifted);
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if (r < 0)
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return r;
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changed = true;
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}
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}
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return changed;
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}
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#else
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static int patch_acls(int fd, const char *name, const struct stat *st, uid_t shift) {
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return 0;
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}
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#endif
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static int patch_fd(int fd, const char *name, const struct stat *st, uid_t shift) {
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uid_t new_uid;
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gid_t new_gid;
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bool changed = false;
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int r;
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assert(fd >= 0);
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assert(st);
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new_uid = shift | (st->st_uid & UINT32_C(0xFFFF));
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new_gid = (gid_t) shift | (st->st_gid & UINT32_C(0xFFFF));
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if (!uid_is_valid(new_uid) || !gid_is_valid(new_gid))
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return -EINVAL;
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if (st->st_uid != new_uid || st->st_gid != new_gid) {
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if (name)
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r = fchownat(fd, name, new_uid, new_gid, AT_SYMLINK_NOFOLLOW);
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else
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r = fchown(fd, new_uid, new_gid);
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if (r < 0)
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return -errno;
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/* The Linux kernel alters the mode in some cases of chown(). Let's undo this. */
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if (name && !S_ISLNK(st->st_mode))
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r = fchmodat(fd, name, st->st_mode, 0);
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else
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r = fchmod(fd, st->st_mode);
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if (r < 0)
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return -errno;
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changed = true;
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}
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r = patch_acls(fd, name, st, shift);
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if (r < 0)
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return r;
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return r > 0 || changed;
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}
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static int recurse_fd(int fd, bool donate_fd, const struct stat *st, uid_t shift) {
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bool changed = false;
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int r;
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assert(fd >= 0);
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r = patch_fd(fd, NULL, st, shift);
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if (r < 0)
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goto finish;
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if (S_ISDIR(st->st_mode)) {
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_cleanup_closedir_ DIR *d = NULL;
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struct dirent *de;
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if (!donate_fd) {
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int copy;
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copy = fcntl(fd, F_DUPFD_CLOEXEC, 3);
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if (copy < 0)
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return -errno;
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fd = copy;
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donate_fd = true;
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}
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d = fdopendir(fd);
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if (!d) {
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r = -errno;
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goto finish;
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}
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fd = -1;
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FOREACH_DIRENT_ALL(de, d, r = -errno; goto finish) {
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struct stat fst;
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if (STR_IN_SET(de->d_name, ".", ".."))
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continue;
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if (fstatat(dirfd(d), de->d_name, &fst, AT_SYMLINK_NOFOLLOW) < 0) {
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r = -errno;
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goto finish;
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}
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if (S_ISDIR(fst.st_mode)) {
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int subdir_fd;
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subdir_fd = openat(dirfd(d), de->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME);
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if (subdir_fd < 0) {
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r = -errno;
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goto finish;
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}
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r = recurse_fd(subdir_fd, true, &fst, shift);
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if (r < 0)
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goto finish;
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if (r > 0)
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changed = true;
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} else {
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r = patch_fd(dirfd(d), de->d_name, &fst, shift);
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if (r < 0)
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goto finish;
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if (r > 0)
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changed = true;
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}
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}
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}
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r = changed;
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finish:
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if (donate_fd)
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safe_close(fd);
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return r;
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}
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static int fd_patch_uid_internal(int fd, bool donate_fd, uid_t shift, uid_t range) {
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struct stat st;
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int r;
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assert(fd >= 0);
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/* Recursively adjusts the UID/GIDs of all files of a directory tree. This is used to automatically fix up an
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* OS tree to the used user namespace UID range. Note that this automatic adjustment only works for UID ranges
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* following the concept that the upper 16bit of a UID identify the container, and the lower 16bit are the actual
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* UID within the container. */
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if ((shift & 0xFFFF) != 0) {
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/* We only support containers where the shift starts at a 2^16 boundary */
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r = -EOPNOTSUPP;
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goto finish;
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}
|
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|
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if (range != 0x10000) {
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/* We only support containers with 16bit UID ranges for the patching logic */
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r = -EOPNOTSUPP;
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goto finish;
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}
|
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|
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if (fstat(fd, &st) < 0) {
|
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r = -errno;
|
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goto finish;
|
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}
|
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|
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if ((uint32_t) st.st_uid >> 16 != (uint32_t) st.st_gid >> 16) {
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/* We only support containers where the uid/gid container ID match */
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r = -EBADE;
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goto finish;
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}
|
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|
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/* Try to detect if the range is already right. Of course, this a pretty drastic optimization, as we assume
|
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* that if the top-level dir has the right upper 16bit assigned, then everything below will have too... */
|
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if (((uint32_t) (st.st_uid ^ shift) >> 16) == 0)
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return 0;
|
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|
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return recurse_fd(fd, donate_fd, &st, shift);
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|
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finish:
|
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if (donate_fd)
|
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safe_close(fd);
|
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|
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return r;
|
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}
|
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|
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int fd_patch_uid(int fd, uid_t shift, uid_t range) {
|
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return fd_patch_uid_internal(fd, false, shift, range);
|
||||
}
|
||||
|
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int path_patch_uid(const char *path, uid_t shift, uid_t range) {
|
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int fd;
|
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|
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fd = open(path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME);
|
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if (fd < 0)
|
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return -errno;
|
||||
|
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return fd_patch_uid_internal(fd, true, shift, range);
|
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}
|
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|
|
@ -0,0 +1,23 @@
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/***
|
||||
This file is part of systemd.
|
||||
|
||||
Copyright 2016 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 <sys/types.h>
|
||||
|
||||
int fd_patch_uid(int fd, uid_t shift, uid_t range);
|
||||
int path_patch_uid(const char *path, uid_t shift, uid_t range);
|
||||
|
|
@ -75,6 +75,7 @@
|
|||
#include "nspawn-expose-ports.h"
|
||||
#include "nspawn-mount.h"
|
||||
#include "nspawn-network.h"
|
||||
#include "nspawn-patch-uid.h"
|
||||
#include "nspawn-register.h"
|
||||
#include "nspawn-settings.h"
|
||||
#include "nspawn-setuid.h"
|
||||
|
|
@ -175,6 +176,7 @@ static ExposePort *arg_expose_ports = NULL;
|
|||
static char **arg_property = NULL;
|
||||
static uid_t arg_uid_shift = UID_INVALID, arg_uid_range = 0x10000U;
|
||||
static bool arg_userns = false;
|
||||
static bool arg_userns_chown = false;
|
||||
static int arg_kill_signal = 0;
|
||||
static bool arg_unified_cgroup_hierarchy = false;
|
||||
static SettingsMask arg_settings_mask = 0;
|
||||
|
|
@ -204,6 +206,7 @@ static void help(void) {
|
|||
" --property=NAME=VALUE Set scope unit property\n"
|
||||
" --private-users[=UIDBASE[:NUIDS]]\n"
|
||||
" Run within user namespace\n"
|
||||
" --private-user-chown Adjust OS tree file ownership for private user range\n"
|
||||
" --private-network Disable network in container\n"
|
||||
" --network-interface=INTERFACE\n"
|
||||
" Assign an existing network interface to the\n"
|
||||
|
|
@ -349,6 +352,7 @@ static int parse_argv(int argc, char *argv[]) {
|
|||
ARG_KILL_SIGNAL,
|
||||
ARG_SETTINGS,
|
||||
ARG_CHDIR,
|
||||
ARG_PRIVATE_USERS_CHOWN,
|
||||
};
|
||||
|
||||
static const struct option options[] = {
|
||||
|
|
@ -392,6 +396,7 @@ static int parse_argv(int argc, char *argv[]) {
|
|||
{ "port", required_argument, NULL, 'p' },
|
||||
{ "property", required_argument, NULL, ARG_PROPERTY },
|
||||
{ "private-users", optional_argument, NULL, ARG_PRIVATE_USERS },
|
||||
{ "private-users-chown", optional_argument, NULL, ARG_PRIVATE_USERS_CHOWN},
|
||||
{ "kill-signal", required_argument, NULL, ARG_KILL_SIGNAL },
|
||||
{ "settings", required_argument, NULL, ARG_SETTINGS },
|
||||
{ "chdir", required_argument, NULL, ARG_CHDIR },
|
||||
|
|
@ -825,6 +830,10 @@ static int parse_argv(int argc, char *argv[]) {
|
|||
arg_userns = true;
|
||||
break;
|
||||
|
||||
case ARG_PRIVATE_USERS_CHOWN:
|
||||
arg_userns_chown = true;
|
||||
break;
|
||||
|
||||
case ARG_KILL_SIGNAL:
|
||||
arg_kill_signal = signal_from_string_try_harder(optarg);
|
||||
if (arg_kill_signal < 0) {
|
||||
|
|
@ -933,8 +942,15 @@ static int parse_argv(int argc, char *argv[]) {
|
|||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (arg_userns && access("/proc/self/uid_map", F_OK) < 0)
|
||||
return log_error_errno(EOPNOTSUPP, "--private-users= is not supported, kernel compiled without user namespace support.");
|
||||
if (arg_userns && access("/proc/self/uid_map", F_OK) < 0) {
|
||||
log_error("--private-users= is not supported, kernel compiled without user namespace support.");
|
||||
return -EOPNOTSUPP;
|
||||
}
|
||||
|
||||
if (arg_userns_chown && arg_read_only) {
|
||||
log_error("--read-only and --private-users-chown may not be combined.");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (argc > optind) {
|
||||
arg_parameters = strv_copy(argv + optind);
|
||||
|
|
@ -2218,6 +2234,29 @@ static int setup_machine_id(const char *directory) {
|
|||
return 0;
|
||||
}
|
||||
|
||||
static int recursive_chown(const char *directory, uid_t shift, uid_t range) {
|
||||
int r;
|
||||
|
||||
assert(directory);
|
||||
|
||||
if (!arg_userns || !arg_userns_chown)
|
||||
return 0;
|
||||
|
||||
r = path_patch_uid(directory, arg_uid_shift, arg_uid_range);
|
||||
if (r == -EOPNOTSUPP)
|
||||
return log_error_errno(r, "Automatic UID/GID adjusting is only supported for UID/GID ranges starting at multiples of 2^16 with a range of 2^16.");
|
||||
if (r == -EBADE)
|
||||
return log_error_errno(r, "Upper 16 bits of root directory UID and GID do not match.");
|
||||
if (r < 0)
|
||||
return log_error_errno(r, "Failed to adjust UID/GID shift of OS tree: %m");
|
||||
if (r == 0)
|
||||
log_debug("Root directory of image is already owned by the right UID/GID range, skipping recursive chown operation.");
|
||||
else
|
||||
log_debug("Patched directory tree to match UID/GID range.");
|
||||
|
||||
return r;
|
||||
}
|
||||
|
||||
static int mount_devices(
|
||||
const char *where,
|
||||
const char *root_device, bool root_device_rw,
|
||||
|
|
@ -2763,6 +2802,10 @@ static int outer_child(
|
|||
if (mount(directory, directory, NULL, MS_BIND|MS_REC, NULL) < 0)
|
||||
return log_error_errno(errno, "Failed to make bind mount: %m");
|
||||
|
||||
r = recursive_chown(directory, arg_uid_shift, arg_uid_range);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
r = setup_volatile(directory, arg_volatile_mode, arg_userns, arg_uid_shift, arg_uid_range, arg_selinux_context);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
|
|
|||
|
|
@ -0,0 +1,61 @@
|
|||
/***
|
||||
This file is part of systemd.
|
||||
|
||||
Copyright 2016 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 <stdlib.h>
|
||||
|
||||
#include "log.h"
|
||||
#include "nspawn-patch-uid.h"
|
||||
#include "user-util.h"
|
||||
#include "util.h"
|
||||
|
||||
int main(int argc, char *argv[]) {
|
||||
uid_t shift, range;
|
||||
int r;
|
||||
|
||||
log_set_max_level(LOG_DEBUG);
|
||||
log_parse_environment();
|
||||
log_open();
|
||||
|
||||
if (argc != 4) {
|
||||
log_error("Expected PATH SHIFT RANGE parameters.");
|
||||
return EXIT_FAILURE;
|
||||
}
|
||||
|
||||
r = parse_uid(argv[2], &shift);
|
||||
if (r < 0) {
|
||||
log_error_errno(r, "Failed to parse UID shift %s.", argv[2]);
|
||||
return EXIT_FAILURE;
|
||||
}
|
||||
|
||||
r = parse_gid(argv[3], &range);
|
||||
if (r < 0) {
|
||||
log_error_errno(r, "Failed to parse UID range %s.", argv[3]);
|
||||
return EXIT_FAILURE;
|
||||
}
|
||||
|
||||
r = path_patch_uid(argv[1], shift, range);
|
||||
if (r < 0) {
|
||||
log_error_errno(r, "Failed to patch directory tree: %m");
|
||||
return EXIT_FAILURE;
|
||||
}
|
||||
|
||||
log_info("Changed: %s", yes_no(r));
|
||||
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
Loading…
Reference in New Issue