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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-06-12 03:50:40 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-06-12 03:50:40 +0000
commitfc53809803cd2bc2434e312b19a18fa36776da12 (patch)
treeb4b43bd6538f51965ce32856e9c053d0f90919c8 /src/nspawn/nspawn.c
parentAdding upstream version 255.5. (diff)
downloadsystemd-fc53809803cd2bc2434e312b19a18fa36776da12.tar.xz
systemd-fc53809803cd2bc2434e312b19a18fa36776da12.zip
Adding upstream version 256.upstream/256
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--src/nspawn/nspawn.c1119
1 files changed, 792 insertions, 327 deletions
diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c
index e46cc1c..5842d3b 100644
--- a/src/nspawn/nspawn.c
+++ b/src/nspawn/nspawn.c
@@ -1,10 +1,7 @@
/* SPDX-License-Identifier: LGPL-2.1-or-later */
-#if HAVE_BLKID
-#endif
#include <errno.h>
#include <getopt.h>
-#include <linux/fs.h>
#include <linux/loop.h>
#if HAVE_SELINUX
#include <selinux/selinux.h>
@@ -12,6 +9,7 @@
#include <stdlib.h>
#include <sys/file.h>
#include <sys/ioctl.h>
+#include <sys/mount.h>
#include <sys/personality.h>
#include <sys/prctl.h>
#include <sys/types.h>
@@ -19,6 +17,8 @@
#include <termios.h>
#include <unistd.h>
+#include <linux/fs.h> /* Must be included after <sys/mount.h> */
+
#include "sd-bus.h"
#include "sd-daemon.h"
#include "sd-id128.h"
@@ -84,6 +84,7 @@
#include "nspawn-stub-pid1.h"
#include "nspawn-util.h"
#include "nspawn.h"
+#include "nsresource.h"
#include "nulstr-util.h"
#include "os-util.h"
#include "pager.h"
@@ -112,6 +113,7 @@
#include "umask-util.h"
#include "unit-name.h"
#include "user-util.h"
+#include "vpick.h"
/* The notify socket inside the container it can use to talk to nspawn using the sd_notify(3) protocol */
#define NSPAWN_NOTIFY_SOCKET_PATH "/run/host/notify"
@@ -229,13 +231,14 @@ static DeviceNode* arg_extra_nodes = NULL;
static size_t arg_n_extra_nodes = 0;
static char **arg_sysctl = NULL;
static ConsoleMode arg_console_mode = _CONSOLE_MODE_INVALID;
-static MachineCredential *arg_credentials = NULL;
-static size_t arg_n_credentials = 0;
+static MachineCredentialContext arg_credentials = {};
static char **arg_bind_user = NULL;
static bool arg_suppress_sync = false;
static char *arg_settings_filename = NULL;
static Architecture arg_architecture = _ARCHITECTURE_INVALID;
static ImagePolicy *arg_image_policy = NULL;
+static char *arg_background = NULL;
+static bool arg_privileged = false;
STATIC_DESTRUCTOR_REGISTER(arg_directory, freep);
STATIC_DESTRUCTOR_REGISTER(arg_template, freep);
@@ -266,11 +269,13 @@ STATIC_DESTRUCTOR_REGISTER(arg_syscall_deny_list, strv_freep);
#if HAVE_SECCOMP
STATIC_DESTRUCTOR_REGISTER(arg_seccomp, seccomp_releasep);
#endif
+STATIC_DESTRUCTOR_REGISTER(arg_credentials, machine_credential_context_done);
STATIC_DESTRUCTOR_REGISTER(arg_cpu_set, cpu_set_reset);
STATIC_DESTRUCTOR_REGISTER(arg_sysctl, strv_freep);
STATIC_DESTRUCTOR_REGISTER(arg_bind_user, strv_freep);
STATIC_DESTRUCTOR_REGISTER(arg_settings_filename, freep);
STATIC_DESTRUCTOR_REGISTER(arg_image_policy, image_policy_freep);
+STATIC_DESTRUCTOR_REGISTER(arg_background, freep);
static int handle_arg_console(const char *arg) {
if (streq(arg, "help")) {
@@ -289,7 +294,7 @@ static int handle_arg_console(const char *arg) {
else if (streq(arg, "passive"))
arg_console_mode = CONSOLE_PASSIVE;
else if (streq(arg, "pipe")) {
- if (isatty(STDIN_FILENO) > 0 && isatty(STDOUT_FILENO) > 0)
+ if (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO))
log_full(arg_quiet ? LOG_DEBUG : LOG_NOTICE,
"Console mode 'pipe' selected, but standard input/output are connected to an interactive TTY. "
"Most likely you want to use 'interactive' console mode for proper interactivity and shell job control. "
@@ -297,7 +302,7 @@ static int handle_arg_console(const char *arg) {
arg_console_mode = CONSOLE_PIPE;
} else if (streq(arg, "autopipe")) {
- if (isatty(STDIN_FILENO) > 0 && isatty(STDOUT_FILENO) > 0)
+ if (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO))
arg_console_mode = CONSOLE_INTERACTIVE;
else
arg_console_mode = CONSOLE_PIPE;
@@ -324,8 +329,8 @@ static int help(void) {
" --version Print version string\n"
" -q --quiet Do not show status information\n"
" --no-pager Do not pipe output into a pager\n"
- " --settings=BOOLEAN Load additional settings from .nspawn file\n\n"
- "%3$sImage:%4$s\n"
+ " --settings=BOOLEAN Load additional settings from .nspawn file\n"
+ "\n%3$sImage:%4$s\n"
" -D --directory=PATH Root directory for the container\n"
" --template=PATH Initialize root directory from template directory,\n"
" if missing\n"
@@ -344,8 +349,8 @@ static int help(void) {
" 'base64:'\n"
" --verity-data=PATH Specify hash device for verity\n"
" --pivot-root=PATH[:PATH]\n"
- " Pivot root to given directory in the container\n\n"
- "%3$sExecution:%4$s\n"
+ " Pivot root to given directory in the container\n"
+ "\n%3$sExecution:%4$s\n"
" -a --as-pid2 Maintain a stub init as PID1, invoke binary as PID2\n"
" -b --boot Boot up full system (i.e. invoke init)\n"
" --chdir=PATH Set working directory in the container\n"
@@ -354,18 +359,18 @@ static int help(void) {
" --kill-signal=SIGNAL Select signal to use for shutting down PID 1\n"
" --notify-ready=BOOLEAN Receive notifications from the child init process\n"
" --suppress-sync=BOOLEAN\n"
- " Suppress any form of disk data synchronization\n\n"
- "%3$sSystem Identity:%4$s\n"
+ " Suppress any form of disk data synchronization\n"
+ "\n%3$sSystem Identity:%4$s\n"
" -M --machine=NAME Set the machine name for the container\n"
" --hostname=NAME Override the hostname for the container\n"
- " --uuid=UUID Set a specific machine UUID for the container\n\n"
- "%3$sProperties:%4$s\n"
+ " --uuid=UUID Set a specific machine UUID for the container\n"
+ "\n%3$sProperties:%4$s\n"
" -S --slice=SLICE Place the container in the specified slice\n"
" --property=NAME=VALUE Set scope unit property\n"
" --register=BOOLEAN Register container as machine\n"
" --keep-unit Do not register a scope for the machine, reuse\n"
- " the service unit nspawn is running in\n\n"
- "%3$sUser Namespacing:%4$s\n"
+ " the service unit nspawn is running in\n"
+ "\n%3$sUser Namespacing:%4$s\n"
" --private-users=no Run without user namespacing\n"
" --private-users=yes|pick|identity\n"
" Run within user namespace, autoselect UID/GID range\n"
@@ -375,8 +380,8 @@ static int help(void) {
" Adjust ('chown') or map ('map') OS tree ownership\n"
" to private UID/GID range\n"
" -U Equivalent to --private-users=pick and\n"
- " --private-users-ownership=auto\n\n"
- "%3$sNetworking:%4$s\n"
+ " --private-users-ownership=auto\n"
+ "\n%3$sNetworking:%4$s\n"
" --private-network Disable network in container\n"
" --network-interface=HOSTIF[:CONTAINERIF]\n"
" Assign an existing network interface to the\n"
@@ -401,8 +406,8 @@ static int help(void) {
" Set network namespace to the one represented by\n"
" the specified kernel namespace file node\n"
" -p --port=[PROTOCOL:]HOSTPORT[:CONTAINERPORT]\n"
- " Expose a container IP port on the host\n\n"
- "%3$sSecurity:%4$s\n"
+ " Expose a container IP port on the host\n"
+ "\n%3$sSecurity:%4$s\n"
" --capability=CAP In addition to the default, retain specified\n"
" capability\n"
" --drop-capability=CAP Drop the specified capability from the default set\n"
@@ -417,20 +422,20 @@ static int help(void) {
" processes in the container\n"
" -L --selinux-apifs-context=SECLABEL\n"
" Set the SELinux security context to be used by\n"
- " API/tmpfs file systems in the container\n\n"
- "%3$sResources:%4$s\n"
+ " API/tmpfs file systems in the container\n"
+ "\n%3$sResources:%4$s\n"
" --rlimit=NAME=LIMIT Set a resource limit for the payload\n"
" --oom-score-adjust=VALUE\n"
" Adjust the OOM score value for the payload\n"
" --cpu-affinity=CPUS Adjust the CPU affinity of the container\n"
- " --personality=ARCH Pick personality for this container\n\n"
- "%3$sIntegration:%4$s\n"
+ " --personality=ARCH Pick personality for this container\n"
+ "\n%3$sIntegration:%4$s\n"
" --resolv-conf=MODE Select mode of /etc/resolv.conf initialization\n"
" --timezone=MODE Select mode of /etc/localtime initialization\n"
" --link-journal=MODE Link up guest journal, one of no, auto, guest, \n"
" host, try-guest, try-host\n"
- " -j Equivalent to --link-journal=try-guest\n\n"
- "%3$sMounts:%4$s\n"
+ " -j Equivalent to --link-journal=try-guest\n"
+ "\n%3$sMounts:%4$s\n"
" --bind=PATH[:PATH[:OPTIONS]]\n"
" Bind mount a file or directory from the host into\n"
" the container\n"
@@ -444,12 +449,13 @@ static int help(void) {
" the container\n"
" --overlay-ro=PATH[:PATH...]:PATH\n"
" Similar, but creates a read-only overlay mount\n"
- " --bind-user=NAME Bind user from host to container\n\n"
- "%3$sInput/Output:%4$s\n"
+ " --bind-user=NAME Bind user from host to container\n"
+ "\n%3$sInput/Output:%4$s\n"
" --console=MODE Select how stdin/stdout/stderr and /dev/console are\n"
" set up for the container.\n"
- " -P --pipe Equivalent to --console=pipe\n\n"
- "%3$sCredentials:%4$s\n"
+ " -P --pipe Equivalent to --console=pipe\n"
+ " --background=COLOR Set ANSI color for background\n"
+ "\n%3$sCredentials:%4$s\n"
" --set-credential=ID:VALUE\n"
" Pass a credential with literal value to container.\n"
" --load-credential=ID:PATH\n"
@@ -514,6 +520,12 @@ static int detect_unified_cgroup_hierarchy_from_environment(void) {
static int detect_unified_cgroup_hierarchy_from_image(const char *directory) {
int r;
+ if (!arg_privileged) {
+ /* We only support the unified mode when running unprivileged */
+ arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_ALL;
+ return 0;
+ }
+
/* Let's inherit the mode to use from the host system, but let's take into consideration what systemd
* in the image actually supports. */
r = cg_all_unified();
@@ -615,7 +627,6 @@ static int parse_mount_settings_env(void) {
e = getenv("SYSTEMD_NSPAWN_API_VFS_WRITABLE");
if (streq_ptr(e, "network"))
arg_mount_settings |= MOUNT_APPLY_APIVFS_RO|MOUNT_APPLY_APIVFS_NETNS;
-
else if (e) {
r = parse_boolean(e);
if (r < 0)
@@ -744,6 +755,7 @@ static int parse_argv(int argc, char *argv[]) {
ARG_BIND_USER,
ARG_SUPPRESS_SYNC,
ARG_IMAGE_POLICY,
+ ARG_BACKGROUND,
};
static const struct option options[] = {
@@ -818,6 +830,7 @@ static int parse_argv(int argc, char *argv[]) {
{ "bind-user", required_argument, NULL, ARG_BIND_USER },
{ "suppress-sync", required_argument, NULL, ARG_SUPPRESS_SYNC },
{ "image-policy", required_argument, NULL, ARG_IMAGE_POLICY },
+ { "background", required_argument, NULL, ARG_BACKGROUND },
{}
};
@@ -1249,33 +1262,11 @@ static int parse_argv(int argc, char *argv[]) {
arg_uid_shift = 0;
arg_uid_range = UINT32_C(0x10000);
} else {
- _cleanup_free_ char *buffer = NULL;
- const char *range, *shift;
-
/* anything else: User namespacing on, UID range is explicitly configured */
-
- range = strchr(optarg, ':');
- if (range) {
- buffer = strndup(optarg, range - optarg);
- if (!buffer)
- return log_oom();
- shift = buffer;
-
- range++;
- r = safe_atou32(range, &arg_uid_range);
- if (r < 0)
- return log_error_errno(r, "Failed to parse UID range \"%s\": %m", range);
- } else
- shift = optarg;
-
- r = parse_uid(shift, &arg_uid_shift);
+ r = parse_userns_uid_range(optarg, &arg_uid_shift, &arg_uid_range);
if (r < 0)
- return log_error_errno(r, "Failed to parse UID \"%s\": %m", optarg);
-
+ return r;
arg_userns_mode = USER_NAMESPACE_FIXED;
-
- if (!userns_shift_range_valid(arg_uid_shift, arg_uid_range))
- return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "UID range cannot be empty or go beyond " UID_FMT ".", UID_INVALID);
}
arg_settings_mask |= SETTING_USERNS;
@@ -1362,17 +1353,27 @@ static int parse_argv(int argc, char *argv[]) {
break;
- case ARG_CHDIR:
+ case ARG_CHDIR: {
+ _cleanup_free_ char *wd = NULL;
+
if (!path_is_absolute(optarg))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Working directory %s is not an absolute path.", optarg);
- r = free_and_strdup(&arg_chdir, optarg);
+ r = path_simplify_alloc(optarg, &wd);
if (r < 0)
- return log_oom();
+ return log_error_errno(r, "Failed to simplify path %s: %m", optarg);
+
+ if (!path_is_normalized(wd))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Working directory path is not normalized: %s", wd);
+
+ if (path_below_api_vfs(wd))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Working directory is below API VFS, refusing: %s", wd);
+ free_and_replace(arg_chdir, wd);
arg_settings_mask |= SETTING_WORKING_DIRECTORY;
break;
+ }
case ARG_PIVOT_ROOT:
r = pivot_root_parse(&arg_pivot_root_new, &arg_pivot_root_old, optarg);
@@ -1395,7 +1396,7 @@ static int parse_argv(int argc, char *argv[]) {
_cleanup_free_ void *k = NULL;
size_t l;
- r = unhexmem(optarg, strlen(optarg), &k, &l);
+ r = unhexmem(optarg, &k, &l);
if (r < 0)
return log_error_errno(r, "Failed to parse root hash: %s", optarg);
if (l < sizeof(sd_id128_t))
@@ -1412,7 +1413,7 @@ static int parse_argv(int argc, char *argv[]) {
void *p;
if ((value = startswith(optarg, "base64:"))) {
- r = unbase64mem(value, strlen(value), &p, &l);
+ r = unbase64mem(value, &p, &l);
if (r < 0)
return log_error_errno(r, "Failed to parse root hash signature '%s': %m", optarg);
@@ -1568,7 +1569,7 @@ static int parse_argv(int argc, char *argv[]) {
break;
case ARG_SET_CREDENTIAL:
- r = machine_credential_set(&arg_credentials, &arg_n_credentials, optarg);
+ r = machine_credential_set(&arg_credentials, optarg);
if (r < 0)
return r;
@@ -1576,7 +1577,7 @@ static int parse_argv(int argc, char *argv[]) {
break;
case ARG_LOAD_CREDENTIAL:
- r = machine_credential_load(&arg_credentials, &arg_n_credentials, optarg);
+ r = machine_credential_load(&arg_credentials, optarg);
if (r < 0)
return r;
@@ -1607,6 +1608,12 @@ static int parse_argv(int argc, char *argv[]) {
return r;
break;
+ case ARG_BACKGROUND:
+ r = free_and_strdup_warn(&arg_background, optarg);
+ if (r < 0)
+ return r;
+ break;
+
case '?':
return -EINVAL;
@@ -1653,6 +1660,21 @@ static int parse_argv(int argc, char *argv[]) {
static int verify_arguments(void) {
int r;
+ SET_FLAG(arg_mount_settings, MOUNT_PRIVILEGED, arg_privileged);
+
+ if (!arg_privileged) {
+ /* machined is not accessible to unpriv clients */
+ if (arg_register) {
+ log_notice("Automatically implying --register=no, since machined is not accessible to unprivileged clients.");
+ arg_register = false;
+ }
+
+ if (!arg_private_network) {
+ log_notice("Automatically implying --private-network, since mounting /sys/ in an unprivileged user namespaces requires network namespacing.");
+ arg_private_network = true;
+ }
+ }
+
if (arg_start_mode == START_PID2 && arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_UNKNOWN) {
/* If we are running the stub init in the container, we don't need to look at what the init
* in the container supports, because we are not using it. Let's immediately pick the right
@@ -2184,7 +2206,7 @@ static int copy_devnodes(const char *dest) {
if (mknod(to, st.st_mode, st.st_rdev) < 0) {
/* Explicitly warn the user when /dev is already populated. */
if (errno == EEXIST)
- log_notice("%s/dev is pre-mounted and pre-populated. If a pre-mounted /dev is provided it needs to be an unpopulated file system.", dest);
+ log_notice("%s/dev/ is pre-mounted and pre-populated. If a pre-mounted /dev/ is provided it needs to be an unpopulated file system.", dest);
if (errno != EPERM)
return log_error_errno(errno, "mknod(%s) failed: %m", to);
@@ -2365,18 +2387,44 @@ static int setup_keyring(void) {
return 0;
}
+int make_run_host(const char *root) {
+ int r;
+
+ assert(root);
+
+ r = userns_mkdir(root, "/run/host", 0755, 0, 0);
+ if (r < 0)
+ return log_error_errno(r, "Failed to create /run/host/: %m");
+
+ return 0;
+}
+
static int setup_credentials(const char *root) {
+ bool world_readable = false;
const char *q;
int r;
- if (arg_n_credentials <= 0)
+ if (arg_credentials.n_credentials == 0)
return 0;
- r = userns_mkdir(root, "/run/host", 0755, 0, 0);
+ /* If starting a single-process container as a non-root user, the uid will only be resolved after we
+ * are inside the inner child, when credential directories and files are already read-only, so they
+ * are unusable as the single process won't have access to them. We also don't have access to the
+ * uid that will actually be used from here, as we are setting credentials up from the outer child.
+ * In order to make them usable as requested by the configuration, make them world readable in that
+ * case, as by definition there are no other processes in that case besides the one being started,
+ * which is being configured to be able to access credentials, and any of its children which will
+ * inherit its privileges anyway. To ensure this, also enforce (and document) that
+ * --no-new-privileges is necessary for this combination to work. */
+ if (arg_no_new_privileges && !isempty(arg_user) && !STR_IN_SET(arg_user, "root", "0") &&
+ arg_start_mode == START_PID1)
+ world_readable = true;
+
+ r = make_run_host(root);
if (r < 0)
- return log_error_errno(r, "Failed to create /run/host: %m");
+ return r;
- r = userns_mkdir(root, "/run/host/credentials", 0700, 0, 0);
+ r = userns_mkdir(root, "/run/host/credentials", world_readable ? 0777 : 0700, 0, 0);
if (r < 0)
return log_error_errno(r, "Failed to create /run/host/credentials: %m");
@@ -2385,23 +2433,23 @@ static int setup_credentials(const char *root) {
if (r < 0)
return r;
- for (size_t i = 0; i < arg_n_credentials; i++) {
+ FOREACH_ARRAY(cred, arg_credentials.credentials, arg_credentials.n_credentials) {
_cleanup_free_ char *j = NULL;
_cleanup_close_ int fd = -EBADF;
- j = path_join(q, arg_credentials[i].id);
+ j = path_join(q, cred->id);
if (!j)
return log_oom();
- fd = open(j, O_CREAT|O_EXCL|O_WRONLY|O_CLOEXEC|O_NOFOLLOW, 0600);
+ fd = open(j, O_CREAT|O_EXCL|O_WRONLY|O_CLOEXEC|O_NOFOLLOW, world_readable ? 0666 : 0600);
if (fd < 0)
return log_error_errno(errno, "Failed to create credential file %s: %m", j);
- r = loop_write(fd, arg_credentials[i].data, arg_credentials[i].size);
+ r = loop_write(fd, cred->data, cred->size);
if (r < 0)
return log_error_errno(r, "Failed to write credential to file %s: %m", j);
- if (fchmod(fd, 0400) < 0)
+ if (fchmod(fd, world_readable ? 0444 : 0400) < 0)
return log_error_errno(errno, "Failed to adjust access mode of %s: %m", j);
if (arg_userns_mode != USER_NAMESPACE_NO) {
@@ -2410,7 +2458,7 @@ static int setup_credentials(const char *root) {
}
}
- if (chmod(q, 0500) < 0)
+ if (chmod(q, world_readable ? 0555 : 0500) < 0)
return log_error_errno(errno, "Failed to adjust access mode of %s: %m", q);
r = userns_lchown(q, 0, 0);
@@ -2536,7 +2584,7 @@ static int setup_journal(const char *directory) {
p = strjoina("/var/log/journal/", SD_ID128_TO_STRING(arg_uuid));
q = prefix_roota(directory, p);
- if (path_is_mount_point(p, NULL, 0) > 0) {
+ if (path_is_mount_point(p) > 0) {
if (try)
return 0;
@@ -2544,7 +2592,7 @@ static int setup_journal(const char *directory) {
"%s: already a mount point, refusing to use for journal", p);
}
- if (path_is_mount_point(q, NULL, 0) > 0) {
+ if (path_is_mount_point(q) > 0) {
if (try)
return 0;
@@ -2620,7 +2668,7 @@ static int setup_journal(const char *directory) {
r = mount_nofollow_verbose(LOG_DEBUG, p, q, NULL, MS_BIND, NULL);
if (r < 0)
- return log_error_errno(errno, "Failed to bind mount journal from host into guest: %m");
+ return log_error_errno(r, "Failed to bind mount journal from host into guest: %m");
return 0;
}
@@ -2680,6 +2728,9 @@ static int reset_audit_loginuid(void) {
if ((arg_clone_ns_flags & CLONE_NEWPID) == 0)
return 0;
+ if (!arg_privileged)
+ return 0;
+
r = read_one_line_file("/proc/self/loginuid", &p);
if (r == -ENOENT)
return 0;
@@ -2709,14 +2760,19 @@ static int mount_tunnel_dig(const char *root) {
const char *p, *q;
int r;
+ if (!arg_privileged) {
+ log_debug("Not digging mount tunnel, because running unprivileged.");
+ return 0;
+ }
+
(void) mkdir_p("/run/systemd/nspawn/", 0755);
(void) mkdir_p("/run/systemd/nspawn/propagate", 0600);
p = strjoina("/run/systemd/nspawn/propagate/", arg_machine);
(void) mkdir_p(p, 0600);
- r = userns_mkdir(root, "/run/host", 0755, 0, 0);
+ r = make_run_host(root);
if (r < 0)
- return log_error_errno(r, "Failed to create /run/host: %m");
+ return r;
r = userns_mkdir(root, NSPAWN_MOUNT_TUNNEL, 0600, 0, 0);
if (r < 0)
@@ -2737,6 +2793,11 @@ static int mount_tunnel_dig(const char *root) {
static int mount_tunnel_open(void) {
int r;
+ if (!arg_privileged) {
+ log_debug("Not opening up mount tunnel, because running unprivileged.");
+ return 0;
+ }
+
r = mount_follow_verbose(LOG_ERR, NULL, NSPAWN_MOUNT_TUNNEL, NULL, MS_SLAVE, NULL);
if (r < 0)
return r;
@@ -2913,14 +2974,72 @@ static int on_request_stop(sd_bus_message *m, void *userdata, sd_bus_error *erro
return 0;
}
+static int pick_paths(void) {
+ int r;
+
+ if (arg_directory) {
+ _cleanup_(pick_result_done) PickResult result = PICK_RESULT_NULL;
+ PickFilter filter = pick_filter_image_dir;
+
+ filter.architecture = arg_architecture;
+
+ r = path_pick_update_warn(
+ &arg_directory,
+ &filter,
+ PICK_ARCHITECTURE|PICK_TRIES,
+ &result);
+ if (r < 0) {
+ /* Accept ENOENT here so that the --template= logic can work */
+ if (r != -ENOENT)
+ return r;
+ } else
+ arg_architecture = result.architecture;
+ }
+
+ if (arg_image) {
+ _cleanup_(pick_result_done) PickResult result = PICK_RESULT_NULL;
+ PickFilter filter = pick_filter_image_raw;
+
+ filter.architecture = arg_architecture;
+
+ r = path_pick_update_warn(
+ &arg_image,
+ &filter,
+ PICK_ARCHITECTURE|PICK_TRIES,
+ &result);
+ if (r < 0)
+ return r;
+
+ arg_architecture = result.architecture;
+ }
+
+ if (arg_template) {
+ _cleanup_(pick_result_done) PickResult result = PICK_RESULT_NULL;
+ PickFilter filter = pick_filter_image_dir;
+
+ filter.architecture = arg_architecture;
+
+ r = path_pick_update_warn(
+ &arg_template,
+ &filter,
+ PICK_ARCHITECTURE,
+ &result);
+ if (r < 0)
+ return r;
+
+ arg_architecture = result.architecture;
+ }
+
+ return 0;
+}
+
static int determine_names(void) {
int r;
if (arg_template && !arg_directory && arg_machine) {
- /* If --template= was specified then we should not
- * search for a machine, but instead create a new one
- * in /var/lib/machine. */
+ /* If --template= was specified then we should not search for a machine, but instead create a
+ * new one in /var/lib/machine. */
arg_directory = path_join("/var/lib/machines", arg_machine);
if (!arg_directory)
@@ -2957,9 +3076,11 @@ static int determine_names(void) {
}
if (!arg_machine) {
- if (arg_directory && path_equal(arg_directory, "/"))
+ if (arg_directory && path_equal(arg_directory, "/")) {
arg_machine = gethostname_malloc();
- else if (arg_image) {
+ if (!arg_machine)
+ return log_oom();
+ } else if (arg_image) {
char *e;
r = path_extract_filename(arg_image, &arg_machine);
@@ -3198,20 +3319,32 @@ static int inner_child(
return r;
if (!arg_network_namespace_path && arg_private_network) {
- r = unshare(CLONE_NEWNET);
+ _cleanup_close_ int netns_fd = -EBADF;
+
+ if (arg_privileged) {
+ if (unshare(CLONE_NEWNET) < 0)
+ return log_error_errno(errno, "Failed to unshare network namespace: %m");
+ }
+
+ netns_fd = namespace_open_by_type(NAMESPACE_NET);
+ if (netns_fd < 0)
+ return log_error_errno(netns_fd, "Failed to open newly allocate network namespace: %m");
+
+ r = send_one_fd(fd_inner_socket, netns_fd, 0);
if (r < 0)
- return log_error_errno(errno, "Failed to unshare network namespace: %m");
+ return log_error_errno(r, "Failed to send network namespace to supervisor: %m");
/* Tell the parent that it can setup network interfaces. */
(void) barrier_place(barrier); /* #3 */
}
- r = mount_sysfs(NULL, arg_mount_settings);
- if (r < 0)
- return r;
+ if (arg_privileged) {
+ r = mount_sysfs(NULL, arg_mount_settings);
+ if (r < 0)
+ return r;
+ }
- /* Wait until we are cgroup-ified, so that we
- * can mount the right cgroup path writable */
+ /* Wait until we are cgroup-ified, so that we can mount the right cgroup path writable */
if (!barrier_place_and_sync(barrier)) /* #4 */
return log_error_errno(SYNTHETIC_ERRNO(ESRCH),
"Parent died too early");
@@ -3396,7 +3529,7 @@ static int inner_child(
if (asprintf(envp + n_env++, "container_uuid=%s", SD_ID128_TO_UUID_STRING(arg_uuid)) < 0)
return log_oom();
- if (fdset_size(fds) > 0) {
+ if (!fdset_isempty(fds)) {
r = fdset_cloexec(fds, false);
if (r < 0)
return log_error_errno(r, "Failed to unset O_CLOEXEC for file descriptors.");
@@ -3408,7 +3541,7 @@ static int inner_child(
if (asprintf(envp + n_env++, "NOTIFY_SOCKET=%s", NSPAWN_NOTIFY_SOCKET_PATH) < 0)
return log_oom();
- if (arg_n_credentials > 0) {
+ if (arg_credentials.n_credentials > 0) {
envp[n_env] = strdup("CREDENTIALS_DIRECTORY=/run/host/credentials");
if (!envp[n_env])
return log_oom();
@@ -3430,6 +3563,9 @@ static int inner_child(
if (!barrier_place_and_sync(barrier)) /* #5 */
return log_error_errno(SYNTHETIC_ERRNO(ESRCH), "Parent died too early");
+ /* Note, this should be done this late (💣 and not moved earlier! 💣), so that all namespacing
+ * changes are already in effect by now, so that any resolved paths here definitely reference
+ * resources inside the container, and not outside of them. */
if (arg_chdir)
if (chdir(arg_chdir) < 0)
return log_error_errno(errno, "Failed to change to specified working directory %s: %m", arg_chdir);
@@ -3509,11 +3645,11 @@ static int inner_child(
return log_error_errno(errno, "execv(%s) failed: %m", exec_target);
}
-static int setup_notify_child(void) {
+static int setup_notify_child(const void *directory) {
_cleanup_close_ int fd = -EBADF;
- static const union sockaddr_union sa = {
+ _cleanup_free_ char *j = NULL;
+ union sockaddr_union sa = {
.un.sun_family = AF_UNIX,
- .un.sun_path = NSPAWN_NOTIFY_SOCKET_PATH,
};
int r;
@@ -3521,14 +3657,26 @@ static int setup_notify_child(void) {
if (fd < 0)
return log_error_errno(errno, "Failed to allocate notification socket: %m");
- (void) mkdir_parents(NSPAWN_NOTIFY_SOCKET_PATH, 0755);
- (void) sockaddr_un_unlink(&sa.un);
+ if (directory) {
+ j = path_join(directory, NSPAWN_NOTIFY_SOCKET_PATH);
+ if (!j)
+ return log_oom();
+ }
- r = bind(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un));
+ r = sockaddr_un_set_path(&sa.un, j ?: NSPAWN_NOTIFY_SOCKET_PATH);
if (r < 0)
- return log_error_errno(errno, "bind(" NSPAWN_NOTIFY_SOCKET_PATH ") failed: %m");
+ return log_error_errno(r, "Failed to set AF_UNIX path to %s: %m", j ?: NSPAWN_NOTIFY_SOCKET_PATH);
- r = userns_lchown(NSPAWN_NOTIFY_SOCKET_PATH, 0, 0);
+ (void) mkdir_parents(sa.un.sun_path, 0755);
+ (void) sockaddr_un_unlink(&sa.un);
+
+ WITH_UMASK(0577) { /* only set "w" bit, which is all that's necessary for connecting from the container */
+ r = bind(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un));
+ if (r < 0)
+ return log_error_errno(errno, "bind(" NSPAWN_NOTIFY_SOCKET_PATH ") failed: %m");
+ }
+
+ r = userns_lchown(sa.un.sun_path, 0, 0);
if (r < 0)
return log_error_errno(r, "Failed to chown " NSPAWN_NOTIFY_SOCKET_PATH ": %m");
@@ -3539,6 +3687,125 @@ static int setup_notify_child(void) {
return TAKE_FD(fd);
}
+static int setup_unix_export_dir_outside(char **ret) {
+ int r;
+
+ assert(ret);
+
+ if (!arg_privileged) {
+ log_debug("Not digging socket tunnel, because running unprivileged.");
+ return 0;
+ }
+
+ _cleanup_free_ char *p = NULL;
+ p = path_join("/run/systemd/nspawn/unix-export", arg_machine);
+ if (!p)
+ return log_oom();
+
+ r = path_is_mount_point(p);
+ if (r > 0)
+ return log_error_errno(SYNTHETIC_ERRNO(EEXIST), "Mount point '%s' exists already, refusing.", p);
+ if (r < 0 && r != -ENOENT)
+ return log_error_errno(r, "Failed to detect if '%s' is a mount point: %m", p);
+
+ r = mkdir_p(p, 0755);
+ if (r < 0)
+ return log_error_errno(r, "Failed to create '%s': %m", p);
+
+ _cleanup_(rmdir_and_freep) char *q = TAKE_PTR(p);
+
+ /* Mount the "unix export" directory really tiny, just 64 inodes. We mark the superblock writable
+ * (since the container shall bind sockets into it). */
+ r = mount_nofollow_verbose(
+ LOG_ERR,
+ "tmpfs",
+ q,
+ "tmpfs",
+ MS_NODEV|MS_NOEXEC|MS_NOSUID|ms_nosymfollow_supported(),
+ "size=4M,nr_inodes=64,mode=0755");
+ if (r < 0)
+ return r;
+
+ _cleanup_(umount_and_rmdir_and_freep) char *w = TAKE_PTR(q);
+
+ /* After creating the superblock we change the bind mount to be read-only. This means that the fs
+ * itself is writable, but not through the mount accessible from the host. */
+ r = mount_nofollow_verbose(
+ LOG_ERR,
+ /* source= */ NULL,
+ w,
+ /* fstype= */ NULL,
+ MS_BIND|MS_REMOUNT|MS_RDONLY|MS_NODEV|MS_NOEXEC|MS_NOSUID|ms_nosymfollow_supported(),
+ /* options= */ NULL);
+ if (r < 0)
+ return r;
+
+ *ret = TAKE_PTR(w);
+ return 0;
+}
+
+static int setup_unix_export_host_inside(const char *directory, const char *unix_export_path) {
+ int r;
+
+ assert(directory);
+
+ if (!arg_privileged)
+ return 0;
+
+ assert(unix_export_path);
+
+ r = make_run_host(directory);
+ if (r < 0)
+ return r;
+
+ _cleanup_free_ char *p = path_join(directory, "run/host/unix-export");
+ if (!p)
+ return log_oom();
+
+ if (mkdir(p, 0755) < 0)
+ return log_error_errno(errno, "Failed to create '%s': %m", p);
+
+ r = mount_nofollow_verbose(
+ LOG_ERR,
+ unix_export_path,
+ p,
+ /* fstype= */ NULL,
+ MS_BIND,
+ /* options= */ NULL);
+ if (r < 0)
+ return r;
+
+ r = mount_nofollow_verbose(
+ LOG_ERR,
+ /* source= */ NULL,
+ p,
+ /* fstype= */ NULL,
+ MS_BIND|MS_REMOUNT|MS_NODEV|MS_NOEXEC|MS_NOSUID|ms_nosymfollow_supported(),
+ /* options= */ NULL);
+ if (r < 0)
+ return r;
+
+ r = userns_lchown(p, 0, 0);
+ if (r < 0)
+ return log_error_errno(r, "Failed to chown '%s': %m", p);
+
+ return 0;
+}
+
+static DissectImageFlags determine_dissect_image_flags(void) {
+ return
+ DISSECT_IMAGE_GENERIC_ROOT |
+ DISSECT_IMAGE_REQUIRE_ROOT |
+ DISSECT_IMAGE_RELAX_VAR_CHECK |
+ DISSECT_IMAGE_USR_NO_ROOT |
+ DISSECT_IMAGE_DISCARD_ON_LOOP |
+ DISSECT_IMAGE_ADD_PARTITION_DEVICES |
+ DISSECT_IMAGE_PIN_PARTITION_DEVICES |
+ (arg_read_only ? DISSECT_IMAGE_READ_ONLY : DISSECT_IMAGE_FSCK|DISSECT_IMAGE_GROWFS) |
+ DISSECT_IMAGE_ALLOW_USERSPACE_VERITY |
+ (arg_console_mode == CONSOLE_INTERACTIVE ? DISSECT_IMAGE_ALLOW_INTERACTIVE_AUTH : 0);
+}
+
static int outer_child(
Barrier *barrier,
const char *directory,
@@ -3546,7 +3813,8 @@ static int outer_child(
int fd_outer_socket,
int fd_inner_socket,
FDSet *fds,
- int netns_fd) {
+ int netns_fd,
+ const char *unix_export_path) {
_cleanup_(bind_user_context_freep) BindUserContext *bind_user_context = NULL;
_cleanup_strv_free_ char **os_release_pairs = NULL;
@@ -3599,10 +3867,8 @@ static int outer_child(
arg_uid_shift,
arg_uid_range,
/* userns_fd= */ -EBADF,
+ determine_dissect_image_flags()|
DISSECT_IMAGE_MOUNT_ROOT_ONLY|
- DISSECT_IMAGE_DISCARD_ON_LOOP|
- DISSECT_IMAGE_USR_NO_ROOT|
- (arg_read_only ? DISSECT_IMAGE_READ_ONLY : DISSECT_IMAGE_FSCK|DISSECT_IMAGE_GROWFS)|
(arg_start_mode == START_BOOT ? DISSECT_IMAGE_VALIDATE_OS : 0));
if (r < 0)
return r;
@@ -3613,7 +3879,12 @@ static int outer_child(
return r;
if (arg_userns_mode != USER_NAMESPACE_NO) {
- r = namespace_open(0, NULL, &mntns_fd, NULL, NULL, NULL);
+ r = namespace_open(0,
+ /* ret_pidns_fd = */ NULL,
+ &mntns_fd,
+ /* ret_netns_fd = */ NULL,
+ /* ret_userns_fd = */ NULL,
+ /* ret_root_fd = */ NULL);
if (r < 0)
return log_error_errno(r, "Failed to pin outer mount namespace: %m");
@@ -3752,7 +4023,7 @@ static int outer_child(
dirs[i] = NULL;
- r = remount_idmap(dirs, arg_uid_shift, arg_uid_range, UID_INVALID, REMOUNT_IDMAPPING_HOST_ROOT);
+ r = remount_idmap(dirs, arg_uid_shift, arg_uid_range, UID_INVALID, UID_INVALID, REMOUNT_IDMAPPING_HOST_ROOT);
if (r == -EINVAL || ERRNO_IS_NEG_NOT_SUPPORTED(r)) {
/* This might fail because the kernel or file system doesn't support idmapping. We
* can't really distinguish this nicely, nor do we have any guarantees about the
@@ -3773,21 +4044,17 @@ static int outer_child(
if (dissected_image) {
/* Now we know the uid shift, let's now mount everything else that might be in the image. */
- r = dissected_image_mount(
+ r = dissected_image_mount_and_warn(
dissected_image,
directory,
arg_uid_shift,
arg_uid_range,
/* userns_fd= */ -EBADF,
+ determine_dissect_image_flags()|
DISSECT_IMAGE_MOUNT_NON_ROOT_ONLY|
- DISSECT_IMAGE_DISCARD_ON_LOOP|
- DISSECT_IMAGE_USR_NO_ROOT|
- (arg_read_only ? DISSECT_IMAGE_READ_ONLY : DISSECT_IMAGE_FSCK|DISSECT_IMAGE_GROWFS)|
(idmap ? DISSECT_IMAGE_MOUNT_IDMAPPED : 0));
- if (r == -EUCLEAN)
- return log_error_errno(r, "File system check for image failed: %m");
if (r < 0)
- return log_error_errno(r, "Failed to mount image file system: %m");
+ return r;
}
if (arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_UNKNOWN) {
@@ -3840,6 +4107,10 @@ static int outer_child(
p = prefix_roota(directory, "/run/host");
(void) make_inaccessible_nodes(p, arg_uid_shift, arg_uid_shift);
+ r = setup_unix_export_host_inside(directory, unix_export_path);
+ if (r < 0)
+ return r;
+
r = setup_pts(directory);
if (r < 0)
return r;
@@ -3889,11 +4160,11 @@ static int outer_child(
/* The same stuff as the $container env var, but nicely readable for the entire payload */
p = prefix_roota(directory, "/run/host/container-manager");
- (void) write_string_file(p, arg_container_service_name, WRITE_STRING_FILE_CREATE);
+ (void) write_string_file(p, arg_container_service_name, WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_MODE_0444);
/* The same stuff as the $container_uuid env var */
p = prefix_roota(directory, "/run/host/container-uuid");
- (void) write_string_filef(p, WRITE_STRING_FILE_CREATE, SD_ID128_UUID_FORMAT_STR, SD_ID128_FORMAT_VAL(arg_uuid));
+ (void) write_string_filef(p, WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_MODE_0444, SD_ID128_UUID_FORMAT_STR, SD_ID128_FORMAT_VAL(arg_uuid));
if (!arg_use_cgns) {
r = mount_cgroups(
@@ -3908,47 +4179,59 @@ static int outer_child(
return r;
}
- /* Mark everything as shared so our mounts get propagated down. This is required to make new bind
- * mounts available in systemd services inside the container that create a new mount namespace. See
- * https://github.com/systemd/systemd/issues/3860 Further submounts (such as /dev) done after this
- * will inherit the shared propagation mode.
- *
- * IMPORTANT: Do not overmount the root directory anymore from now on to enable moving the root
- * directory mount to root later on.
- * https://github.com/systemd/systemd/issues/3847#issuecomment-562735251
- */
- r = mount_switch_root(directory, MS_SHARED);
- if (r < 0)
- return log_error_errno(r, "Failed to move root directory: %m");
+ /* We have different codepaths here for privileged and non-privileged mode. In privileged mode we'll
+ * now switch into the target directory, and then do the final setup from there. If a user namespace
+ * is then allocated for the container, the root mount and everything else will be out of reach for
+ * it. For unprivileged containers we cannot do that however, since we couldn't mount a sysfs and
+ * procfs then anymore, since that only works if there's an unobstructed instance currently
+ * visible. Hence there we do it the other way round: we first allocate a new set of namespaces
+ * (and fork for it) for which we then mount sysfs/procfs, and only then switch root. */
- /* We finished setting up the rootfs which is a shared mount. The mount tunnel needs to be a
- * dependent mount otherwise we can't MS_MOVE mounts that were propagated from the host into
- * the container. */
- r = mount_tunnel_open();
- if (r < 0)
- return r;
+ if (arg_privileged) {
+ /* Mark everything as shared so our mounts get propagated down. This is required to make new
+ * bind mounts available in systemd services inside the container that create a new mount
+ * namespace. See https://github.com/systemd/systemd/issues/3860 Further submounts (such as
+ * /dev/) done after this will inherit the shared propagation mode.
+ *
+ * IMPORTANT: Do not overmount the root directory anymore from now on to enable moving the root
+ * directory mount to root later on.
+ * https://github.com/systemd/systemd/issues/3847#issuecomment-562735251
+ */
+ r = mount_switch_root(directory, MS_SHARED);
+ if (r < 0)
+ return log_error_errno(r, "Failed to move root directory: %m");
- if (arg_userns_mode != USER_NAMESPACE_NO) {
- /* In order to mount procfs and sysfs in an unprivileged container the kernel
- * requires that a fully visible instance is already present in the target mount
- * namespace. Mount one here so the inner child can mount its own instances. Later
- * we umount the temporary instances created here before we actually exec the
- * payload. Since the rootfs is shared the umount will propagate into the container.
- * Note, the inner child wouldn't be able to unmount the instances on its own since
- * it doesn't own the originating mount namespace. IOW, the outer child needs to do
- * this. */
- r = pin_fully_visible_fs();
+ /* We finished setting up the rootfs which is a shared mount. The mount tunnel needs to be a
+ * dependent mount otherwise we can't MS_MOVE mounts that were propagated from the host into
+ * the container. */
+ r = mount_tunnel_open();
if (r < 0)
return r;
- }
- fd = setup_notify_child();
+ if (arg_userns_mode != USER_NAMESPACE_NO) {
+ /* In order to mount procfs and sysfs in an unprivileged container the kernel
+ * requires that a fully visible instance is already present in the target mount
+ * namespace. Mount one here so the inner child can mount its own instances. Later
+ * we umount the temporary instances created here before we actually exec the
+ * payload. Since the rootfs is shared the umount will propagate into the container.
+ * Note, the inner child wouldn't be able to unmount the instances on its own since
+ * it doesn't own the originating mount namespace. IOW, the outer child needs to do
+ * this. */
+ r = pin_fully_visible_fs();
+ if (r < 0)
+ return r;
+ }
+
+ fd = setup_notify_child(NULL);
+ } else
+ fd = setup_notify_child(directory);
if (fd < 0)
return fd;
pid = raw_clone(SIGCHLD|CLONE_NEWNS|
arg_clone_ns_flags |
- (arg_userns_mode != USER_NAMESPACE_NO ? CLONE_NEWUSER : 0));
+ (arg_userns_mode != USER_NAMESPACE_NO ? CLONE_NEWUSER : 0) |
+ ((arg_private_network && !arg_privileged) ? CLONE_NEWNET : 0));
if (pid < 0)
return log_error_errno(errno, "Failed to fork inner child: %m");
if (pid == 0) {
@@ -3958,11 +4241,35 @@ static int outer_child(
* user if user namespaces are turned on. */
if (arg_network_namespace_path) {
- r = namespace_enter(-1, -1, netns_fd, -1, -1);
+ r = namespace_enter(/* pidns_fd = */ -EBADF,
+ /* mntns_fd = */ -EBADF,
+ netns_fd,
+ /* userns_fd = */ -EBADF,
+ /* root_fd = */ -EBADF);
if (r < 0)
return log_error_errno(r, "Failed to join network namespace: %m");
}
+ if (!arg_privileged) {
+ /* In unprivileged operation, sysfs + procfs are special, we'll have to mount them
+ * inside the inner namespaces, but before we switch root. Hence do so here. */
+ _cleanup_free_ char *j = path_join(directory, "/proc");
+ if (!j)
+ return log_oom();
+
+ r = mount_follow_verbose(LOG_ERR, "proc", j, "proc", MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL);
+ if (r < 0)
+ return r;
+
+ r = mount_sysfs(directory, arg_mount_settings);
+ if (r < 0)
+ return r;
+
+ r = mount_switch_root(directory, MS_SHARED);
+ if (r < 0)
+ return log_error_errno(r, "Failed to move root directory: %m");
+ }
+
r = inner_child(barrier, fd_inner_socket, fds, os_release_pairs);
if (r < 0)
_exit(EXIT_FAILURE);
@@ -4030,13 +4337,13 @@ static int uid_shift_pick(uid_t *shift, LockFile *ret_lock_file) {
return r;
/* Make some superficial checks whether the range is currently known in the user database */
- if (getpwuid(candidate))
+ if (getpwuid_malloc(candidate, /* ret= */ NULL) >= 0)
goto next;
- if (getpwuid(candidate + UINT32_C(0xFFFE)))
+ if (getpwuid_malloc(candidate + UINT32_C(0xFFFE), /* ret= */ NULL) >= 0)
goto next;
- if (getgrgid(candidate))
+ if (getgrgid_malloc(candidate, /* ret= */ NULL) >= 0)
goto next;
- if (getgrgid(candidate + UINT32_C(0xFFFE)))
+ if (getgrgid_malloc(candidate + UINT32_C(0xFFFE), /* ret= */ NULL) >= 0)
goto next;
*ret_lock_file = lf;
@@ -4217,6 +4524,17 @@ static int nspawn_dispatch_notify_fd(sd_event_source *source, int fd, uint32_t r
if (!tags)
return log_oom();
+ if (DEBUG_LOGGING) {
+ _cleanup_free_ char *joined = strv_join(tags, " ");
+
+ if (joined) {
+ _cleanup_free_ char *j = cescape(joined);
+ free_and_replace(joined, j);
+ }
+
+ log_debug("Got sd_notify() message: %s", strnull(joined));
+ }
+
if (strv_contains(tags, "READY=1")) {
r = sd_notify(false, "READY=1\n");
if (r < 0)
@@ -4233,6 +4551,9 @@ static int nspawn_dispatch_notify_fd(sd_event_source *source, int fd, uint32_t r
static int setup_notify_parent(sd_event *event, int fd, pid_t *inner_child_pid, sd_event_source **notify_event_source) {
int r;
+ if (fd < 0)
+ return 0;
+
r = sd_event_add_io(event, notify_event_source, fd, EPOLLIN, nspawn_dispatch_notify_fd, inner_child_pid);
if (r < 0)
return log_error_errno(r, "Failed to allocate notify event source: %m");
@@ -4242,6 +4563,25 @@ static int setup_notify_parent(sd_event *event, int fd, pid_t *inner_child_pid,
return 0;
}
+static void set_window_title(PTYForward *f) {
+ _cleanup_free_ char *hn = NULL, *dot = NULL;
+
+ assert(f);
+
+ (void) gethostname_strict(&hn);
+
+ if (emoji_enabled())
+ dot = strjoin(special_glyph(SPECIAL_GLYPH_BLUE_CIRCLE), " ");
+
+ if (hn)
+ (void) pty_forward_set_titlef(f, "%sContainer %s on %s", strempty(dot), arg_machine, hn);
+ else
+ (void) pty_forward_set_titlef(f, "%sContainer %s", strempty(dot), arg_machine);
+
+ if (dot)
+ (void) pty_forward_set_title_prefix(f, dot);
+}
+
static int merge_settings(Settings *settings, const char *path) {
int rl;
@@ -4457,7 +4797,7 @@ static int merge_settings(Settings *settings, const char *path) {
#endif
}
- for (rl = 0; rl < _RLIMIT_MAX; rl ++) {
+ for (rl = 0; rl < _RLIMIT_MAX; rl++) {
if ((arg_settings_mask & (SETTING_RLIMIT_FIRST << rl)))
continue;
@@ -4593,26 +4933,28 @@ static int load_settings(void) {
return 0;
/* We first look in the admin's directories in /etc and /run */
- FOREACH_STRING(i, "/etc/systemd/nspawn", "/run/systemd/nspawn") {
- _cleanup_free_ char *j = NULL;
+ if (arg_privileged) {
+ FOREACH_STRING(i, "/etc/systemd/nspawn", "/run/systemd/nspawn") {
+ _cleanup_free_ char *j = NULL;
- j = path_join(i, arg_settings_filename);
- if (!j)
- return log_oom();
+ j = path_join(i, arg_settings_filename);
+ if (!j)
+ return log_oom();
- f = fopen(j, "re");
- if (f) {
- p = TAKE_PTR(j);
+ f = fopen(j, "re");
+ if (f) {
+ p = TAKE_PTR(j);
- /* By default, we trust configuration from /etc and /run */
- if (arg_settings_trusted < 0)
- arg_settings_trusted = true;
+ /* By default, we trust configuration from /etc and /run */
+ if (arg_settings_trusted < 0)
+ arg_settings_trusted = true;
- break;
- }
+ break;
+ }
- if (errno != ENOENT)
- return log_error_errno(errno, "Failed to open %s: %m", j);
+ if (errno != ENOENT)
+ return log_error_errno(errno, "Failed to open %s: %m", j);
+ }
}
if (!f) {
@@ -4672,10 +5014,14 @@ static int load_oci_bundle(void) {
static int run_container(
DissectedImage *dissected_image,
+ int userns_fd,
FDSet *fds,
- char veth_name[IFNAMSIZ], bool *veth_created,
+ char veth_name[IFNAMSIZ],
+ bool *veth_created,
struct ExposeArgs *expose_args,
- int *master, pid_t *pid, int *ret) {
+ int *master,
+ pid_t *pid,
+ int *ret) {
static const struct sigaction sa = {
.sa_handler = nop_signal_handler,
@@ -4691,6 +5037,7 @@ static int run_container(
_cleanup_close_ int notify_socket = -EBADF, mntns_fd = -EBADF, fd_kmsg_fifo = -EBADF;
_cleanup_(barrier_destroy) Barrier barrier = BARRIER_NULL;
_cleanup_(sd_event_source_unrefp) sd_event_source *notify_event_source = NULL;
+ _cleanup_(umount_and_rmdir_and_freep) char *unix_export_host_dir = NULL;
_cleanup_(sd_event_unrefp) sd_event *event = NULL;
_cleanup_(pty_forward_freep) PTYForward *forward = NULL;
_cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
@@ -4706,6 +5053,11 @@ static int run_container(
assert_se(sigemptyset(&mask_chld) == 0);
assert_se(sigaddset(&mask_chld, SIGCHLD) == 0);
+ /* Set up the unix export host directory on the host first */
+ r = setup_unix_export_dir_outside(&unix_export_host_dir);
+ if (r < 0)
+ return r;
+
if (arg_userns_mode == USER_NAMESPACE_PICK) {
/* When we shall pick the UID/GID range, let's first lock /etc/passwd, so that we can safely
* check with getpwuid() if the specific user already exists. Note that /etc might be
@@ -4754,11 +5106,44 @@ static int run_container(
"Path %s doesn't refer to a network namespace, refusing.", arg_network_namespace_path);
}
- *pid = raw_clone(SIGCHLD|CLONE_NEWNS);
- if (*pid < 0)
- return log_error_errno(errno, "clone() failed%s: %m",
- errno == EINVAL ?
- ", do you have namespace support enabled in your kernel? (You need UTS, IPC, PID and NET namespacing built in)" : "");
+ if (arg_privileged) {
+ assert(userns_fd < 0);
+
+ /* If we have no user namespace then we'll clone and create a new mount namespace right-away. */
+
+ *pid = raw_clone(SIGCHLD|CLONE_NEWNS);
+ if (*pid < 0)
+ return log_error_errno(errno, "clone() failed%s: %m",
+ errno == EINVAL ?
+ ", do you have namespace support enabled in your kernel? (You need UTS, IPC, PID and NET namespacing built in)" : "");
+ } else {
+ assert(userns_fd >= 0);
+
+ /* If we have a user namespace then we'll clone() first, and then join the user namespace,
+ * and then open the mount namespace, so that it is owned by the user namespace */
+
+ *pid = raw_clone(SIGCHLD);
+ if (*pid < 0)
+ return log_error_errno(errno, "clone() failed: %m");
+
+ if (*pid == 0) {
+ if (setns(userns_fd, CLONE_NEWUSER) < 0) {
+ log_error_errno(errno, "Failed to join allocate user namespace: %m");
+ _exit(EXIT_FAILURE);
+ }
+
+ r = reset_uid_gid();
+ if (r < 0) {
+ log_error_errno(r, "Failed to reset UID/GID to root: %m");
+ _exit(EXIT_FAILURE);
+ }
+
+ if (unshare(CLONE_NEWNS) < 0) {
+ log_error_errno(errno, "Failed to unshare file system namespace: %m");
+ _exit(EXIT_FAILURE);
+ }
+ }
+ }
if (*pid == 0) {
/* The outer child only has a file system namespace. */
@@ -4776,7 +5161,8 @@ static int run_container(
fd_outer_socket_pair[1],
fd_inner_socket_pair[1],
fds,
- child_netns_fd);
+ child_netns_fd,
+ unix_export_host_dir);
if (r < 0)
_exit(EXIT_FAILURE);
@@ -4894,14 +5280,13 @@ static int run_container(
/* Wait until the child has unshared its network namespace. */
if (!barrier_place_and_sync(&barrier)) /* #3 */
return log_error_errno(SYNTHETIC_ERRNO(ESRCH), "Child died too early");
- }
- if (child_netns_fd < 0) {
- /* Make sure we have an open file descriptor to the child's network
- * namespace so it stays alive even if the child exits. */
- r = namespace_open(*pid, NULL, NULL, &child_netns_fd, NULL, NULL);
- if (r < 0)
- return log_error_errno(r, "Failed to open child network namespace: %m");
+ /* Make sure we have an open file descriptor to the child's network namespace so it
+ * stays alive even if the child exits. */
+ assert(child_netns_fd < 0);
+ child_netns_fd = receive_one_fd(fd_inner_socket_pair[0], 0);
+ if (child_netns_fd < 0)
+ return log_error_errno(r, "Failed to receive child network namespace: %m");
}
r = move_network_interfaces(child_netns_fd, arg_network_interfaces);
@@ -4909,12 +5294,29 @@ static int run_container(
return r;
if (arg_network_veth) {
- r = setup_veth(arg_machine, *pid, veth_name,
- arg_network_bridge || arg_network_zone, &arg_network_provided_mac);
- if (r < 0)
- return r;
- else if (r > 0)
- ifi = r;
+ if (arg_privileged) {
+ r = setup_veth(arg_machine, *pid, veth_name,
+ arg_network_bridge || arg_network_zone, &arg_network_provided_mac);
+ if (r < 0)
+ return r;
+ else if (r > 0)
+ ifi = r;
+ } else {
+ _cleanup_free_ char *host_ifname = NULL;
+
+ r = nsresource_add_netif(userns_fd, child_netns_fd, /* namespace_ifname= */ NULL, &host_ifname, /* ret_namespace_ifname= */ NULL);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add network interface to container: %m");
+
+ ifi = if_nametoindex(host_ifname);
+ if (ifi == 0)
+ return log_error_errno(errno, "Failed to resolve interface '%s': %m", host_ifname);
+
+ if (strlen(host_ifname) >= IFNAMSIZ)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Host interface name too long?");
+
+ strcpy(veth_name, host_ifname);
+ }
if (arg_network_bridge) {
/* Add the interface to a bridge */
@@ -4953,9 +5355,12 @@ static int run_container(
}
if (arg_register || !arg_keep_unit) {
- r = sd_bus_default_system(&bus);
+ if (arg_privileged)
+ r = sd_bus_default_system(&bus);
+ else
+ r = sd_bus_default_user(&bus);
if (r < 0)
- return log_error_errno(r, "Failed to open system bus: %m");
+ return log_error_errno(r, "Failed to open bus: %m");
r = sd_bus_set_close_on_exit(bus, false);
if (r < 0)
@@ -5016,7 +5421,13 @@ static int run_container(
} else if (arg_slice || arg_property)
log_notice("Machine and scope registration turned off, --slice= and --property= settings will have no effect.");
- r = create_subcgroup(*pid, arg_keep_unit, arg_unified_cgroup_hierarchy);
+ r = create_subcgroup(
+ *pid,
+ arg_keep_unit,
+ arg_unified_cgroup_hierarchy,
+ arg_uid_shift,
+ userns_fd,
+ arg_privileged);
if (r < 0)
return r;
@@ -5024,14 +5435,8 @@ static int run_container(
if (r < 0)
return r;
- r = chown_cgroup(*pid, arg_unified_cgroup_hierarchy, arg_uid_shift);
- if (r < 0)
- return r;
-
- /* Notify the child that the parent is ready with all
- * its setup (including cgroup-ification), and that
- * the child can now hand over control to the code to
- * run inside the container. */
+ /* Notify the child that the parent is ready with all its setup (including cgroup-ification), and
+ * that the child can now hand over control to the code to run inside the container. */
(void) barrier_place(&barrier); /* #4 */
/* Block SIGCHLD here, before notifying child.
@@ -5146,9 +5551,23 @@ static int run_container(
return log_error_errno(r, "Failed to create PTY forwarder: %m");
if (arg_console_width != UINT_MAX || arg_console_height != UINT_MAX)
- (void) pty_forward_set_width_height(forward,
- arg_console_width,
- arg_console_height);
+ (void) pty_forward_set_width_height(
+ forward,
+ arg_console_width,
+ arg_console_height);
+
+ if (!arg_background && shall_tint_background()) {
+ _cleanup_free_ char *bg = NULL;
+
+ r = terminal_tint_color(220 /* blue */, &bg);
+ if (r < 0)
+ log_debug_errno(r, "Failed to determine terminal background color, not tinting.");
+ else
+ (void) pty_forward_set_background_color(forward, bg);
+ } else if (!isempty(arg_background))
+ (void) pty_forward_set_background_color(forward, arg_background);
+
+ set_window_title(forward);
break;
default:
@@ -5183,38 +5602,10 @@ static int run_container(
fd_kmsg_fifo = safe_close(fd_kmsg_fifo);
- if (arg_private_network) {
- /* Move network interfaces back to the parent network namespace. We use `safe_fork`
- * to avoid having to move the parent to the child network namespace. */
- r = safe_fork(NULL, FORK_RESET_SIGNALS|FORK_DEATHSIG_SIGTERM|FORK_WAIT|FORK_LOG, NULL);
+ if (arg_private_network && arg_privileged) {
+ r = move_back_network_interfaces(child_netns_fd, arg_network_interfaces);
if (r < 0)
return r;
-
- if (r == 0) {
- _cleanup_close_ int parent_netns_fd = -EBADF;
-
- r = namespace_open(getpid_cached(), NULL, NULL, &parent_netns_fd, NULL, NULL);
- if (r < 0) {
- log_error_errno(r, "Failed to open parent network namespace: %m");
- _exit(EXIT_FAILURE);
- }
-
- r = namespace_enter(-1, -1, child_netns_fd, -1, -1);
- if (r < 0) {
- log_error_errno(r, "Failed to enter child network namespace: %m");
- _exit(EXIT_FAILURE);
- }
-
- /* Reverse network interfaces pair list so that interfaces get their initial name back.
- * This is about ensuring interfaces get their old name back when being moved back. */
- arg_network_interfaces = strv_reverse(arg_network_interfaces);
-
- r = move_network_interfaces(parent_netns_fd, arg_network_interfaces);
- if (r < 0)
- log_error_errno(r, "Failed to move network interfaces back to parent network namespace: %m");
-
- _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
- }
}
r = wait_for_container(TAKE_PID(*pid), &container_status);
@@ -5288,7 +5679,7 @@ static int initialize_rlimits(void) {
* don't read the other limits from PID 1 but prefer the static table above. */
};
- int rl;
+ int rl, r;
for (rl = 0; rl < _RLIMIT_MAX; rl++) {
/* Let's only fill in what the user hasn't explicitly configured anyway */
@@ -5299,8 +5690,9 @@ static int initialize_rlimits(void) {
if (IN_SET(rl, RLIMIT_NPROC, RLIMIT_SIGPENDING)) {
/* For these two let's read the limits off PID 1. See above for an explanation. */
- if (prlimit(1, rl, NULL, &buffer) < 0)
- return log_error_errno(errno, "Failed to read resource limit RLIMIT_%s of PID 1: %m", rlimit_to_string(rl));
+ r = pid_getrlimit(1, rl, &buffer);
+ if (r < 0)
+ return log_error_errno(r, "Failed to read resource limit RLIMIT_%s of PID 1: %m", rlimit_to_string(rl));
v = &buffer;
} else if (rl == RLIMIT_NOFILE) {
@@ -5351,6 +5743,10 @@ static int cant_be_in_netns(void) {
if (r == -ENOENT || ERRNO_IS_NEG_DISCONNECT(r))
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
"Sorry, but --image= requires access to the host's /run/ hierarchy, since we need access to udev.");
+ if (ERRNO_IS_NEG_PRIVILEGE(r)) {
+ log_debug_errno(r, "Can't connect to udev control socket, assuming we are in same netns.");
+ return 0;
+ }
if (r < 0)
return log_error_errno(r, "Failed to connect socket to udev control socket: %m");
@@ -5369,7 +5765,7 @@ static int cant_be_in_netns(void) {
static int run(int argc, char *argv[]) {
bool remove_directory = false, remove_image = false, veth_created = false, remove_tmprootdir = false;
- _cleanup_close_ int master = -EBADF;
+ _cleanup_close_ int master = -EBADF, userns_fd = -EBADF;
_cleanup_fdset_free_ FDSet *fds = NULL;
int r, n_fd_passed, ret = EXIT_SUCCESS;
char veth_name[IFNAMSIZ] = "";
@@ -5381,20 +5777,14 @@ static int run(int argc, char *argv[]) {
_cleanup_(fw_ctx_freep) FirewallContext *fw_ctx = NULL;
pid_t pid = 0;
- log_parse_environment();
- log_open();
+ log_setup();
+
+ arg_privileged = getuid() == 0;
r = parse_argv(argc, argv);
if (r <= 0)
goto finish;
- if (geteuid() != 0) {
- r = log_warning_errno(SYNTHETIC_ERRNO(EPERM),
- argc >= 2 ? "Need to be root." :
- "Need to be root (and some arguments are usually required).\nHint: try --help");
- goto finish;
- }
-
r = cant_be_in_netns();
if (r < 0)
goto finish;
@@ -5407,6 +5797,10 @@ static int run(int argc, char *argv[]) {
if (r < 0)
goto finish;
+ r = pick_paths();
+ if (r < 0)
+ goto finish;
+
r = determine_names();
if (r < 0)
goto finish;
@@ -5421,7 +5815,7 @@ static int run(int argc, char *argv[]) {
if (!arg_private_network && arg_userns_mode != USER_NAMESPACE_NO && arg_uid_shift > 0)
arg_caps_retain &= ~(UINT64_C(1) << CAP_NET_BIND_SERVICE);
- r = cg_unified();
+ r = cg_unified(); /* initialize cache early */
if (r < 0) {
log_error_errno(r, "Failed to determine whether the unified cgroups hierarchy is used: %m");
goto finish;
@@ -5431,6 +5825,10 @@ static int run(int argc, char *argv[]) {
if (r < 0)
goto finish;
+ r = resolve_network_interface_names(arg_network_interfaces);
+ if (r < 0)
+ goto finish;
+
r = verify_network_interfaces_initialized();
if (r < 0)
goto finish;
@@ -5438,6 +5836,16 @@ static int run(int argc, char *argv[]) {
/* Reapply environment settings. */
(void) detect_unified_cgroup_hierarchy_from_environment();
+ if (!arg_privileged) {
+ r = cg_all_unified();
+ if (r < 0) {
+ log_error_errno(r, "Failed to determine if we are in unified cgroupv2 mode: %m");
+ goto finish;
+ }
+ if (r == 0)
+ return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "Unprivileged operation only supported in unified cgroupv2 mode.");
+ }
+
/* Ignore SIGPIPE here, because we use splice() on the ptyfwd stuff and that will generate SIGPIPE if
* the result is closed. Note that the container payload child will reset signal mask+handler anyway,
* so just turning this off here means we only turn it off in nspawn itself, not any children. */
@@ -5457,9 +5865,21 @@ static int run(int argc, char *argv[]) {
* the child. Functions like copy_devnodes() change the umask temporarily. */
umask(0022);
+ if (arg_console_mode < 0)
+ arg_console_mode = isatty(STDIN_FILENO) && isatty(STDOUT_FILENO) ?
+ CONSOLE_INTERACTIVE : CONSOLE_READ_ONLY;
+
+ if (arg_console_mode == CONSOLE_PIPE) /* if we pass STDERR on to the container, don't add our own logs into it too */
+ arg_quiet = true;
+
if (arg_directory) {
assert(!arg_image);
+ if (!arg_privileged) {
+ r = log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "Invoking container from plain directory tree is currently not supported if called without privileges.");
+ goto finish;
+ }
+
/* Safety precaution: let's not allow running images from the live host OS image, as long as
* /var from the host will propagate into container dynamically (because bad things happen if
* two systems write to the same /var). Let's allow it for the special cases where /var is
@@ -5480,7 +5900,7 @@ static int run(int argc, char *argv[]) {
/* If the specified path is a mount point we generate the new snapshot immediately
* inside it under a random name. However if the specified is not a mount point we
* create the new snapshot in the parent directory, just next to it. */
- r = path_is_mount_point(arg_directory, NULL, 0);
+ r = path_is_mount_point(arg_directory);
if (r < 0) {
log_error_errno(r, "Failed to determine whether directory %s is mount point: %m", arg_directory);
goto finish;
@@ -5496,7 +5916,11 @@ static int run(int argc, char *argv[]) {
/* We take an exclusive lock on this image, since it's our private, ephemeral copy
* only owned by us and no one else. */
- r = image_path_lock(np, LOCK_EX|LOCK_NB, &tree_global_lock, &tree_local_lock);
+ r = image_path_lock(
+ np,
+ LOCK_EX|LOCK_NB,
+ arg_privileged ? &tree_global_lock : NULL,
+ &tree_local_lock);
if (r < 0) {
log_error_errno(r, "Failed to lock %s: %m", np);
goto finish;
@@ -5528,7 +5952,11 @@ static int run(int argc, char *argv[]) {
if (r < 0)
goto finish;
- r = image_path_lock(arg_directory, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
+ r = image_path_lock(
+ arg_directory,
+ (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB,
+ arg_privileged ? &tree_global_lock : NULL,
+ &tree_local_lock);
if (r == -EBUSY) {
log_error_errno(r, "Directory tree %s is currently busy.", arg_directory);
goto finish;
@@ -5620,15 +6048,12 @@ static int run(int argc, char *argv[]) {
} else {
DissectImageFlags dissect_image_flags =
- DISSECT_IMAGE_GENERIC_ROOT |
- DISSECT_IMAGE_REQUIRE_ROOT |
- DISSECT_IMAGE_RELAX_VAR_CHECK |
- DISSECT_IMAGE_USR_NO_ROOT |
- DISSECT_IMAGE_ADD_PARTITION_DEVICES |
- DISSECT_IMAGE_PIN_PARTITION_DEVICES;
+ determine_dissect_image_flags();
+
assert(arg_image);
assert(!arg_template);
+
r = chase_and_update(&arg_image, 0);
if (r < 0)
goto finish;
@@ -5643,9 +6068,13 @@ static int run(int argc, char *argv[]) {
}
/* Always take an exclusive lock on our own ephemeral copy. */
- r = image_path_lock(np, LOCK_EX|LOCK_NB, &tree_global_lock, &tree_local_lock);
+ r = image_path_lock(
+ np,
+ LOCK_EX|LOCK_NB,
+ arg_privileged ? &tree_global_lock : NULL,
+ &tree_local_lock);
if (r < 0) {
- r = log_error_errno(r, "Failed to create image lock: %m");
+ log_error_errno(r, "Failed to create image lock: %m");
goto finish;
}
@@ -5668,13 +6097,17 @@ static int run(int argc, char *argv[]) {
free_and_replace(arg_image, np);
remove_image = true;
} else {
- r = image_path_lock(arg_image, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
+ r = image_path_lock(
+ arg_image,
+ (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB,
+ arg_privileged ? &tree_global_lock : NULL,
+ &tree_local_lock);
if (r == -EBUSY) {
- r = log_error_errno(r, "Disk image %s is currently busy.", arg_image);
+ log_error_errno(r, "Disk image %s is currently busy.", arg_image);
goto finish;
}
if (r < 0) {
- r = log_error_errno(r, "Failed to create image lock: %m");
+ log_error_errno(r, "Failed to create image lock: %m");
goto finish;
}
@@ -5703,56 +6136,80 @@ static int run(int argc, char *argv[]) {
goto finish;
}
- r = loop_device_make_by_path(
- arg_image,
- arg_read_only ? O_RDONLY : O_RDWR,
- /* sector_size= */ UINT32_MAX,
- FLAGS_SET(dissect_image_flags, DISSECT_IMAGE_NO_PARTITION_TABLE) ? 0 : LO_FLAGS_PARTSCAN,
- LOCK_SH,
- &loop);
- if (r < 0) {
- log_error_errno(r, "Failed to set up loopback block device: %m");
- goto finish;
- }
+ if (arg_privileged) {
+ r = loop_device_make_by_path(
+ arg_image,
+ arg_read_only ? O_RDONLY : O_RDWR,
+ /* sector_size= */ UINT32_MAX,
+ FLAGS_SET(dissect_image_flags, DISSECT_IMAGE_NO_PARTITION_TABLE) ? 0 : LO_FLAGS_PARTSCAN,
+ LOCK_SH,
+ &loop);
+ if (r < 0) {
+ log_error_errno(r, "Failed to set up loopback block device: %m");
+ goto finish;
+ }
- r = dissect_loop_device_and_warn(
- loop,
- &arg_verity_settings,
- /* mount_options=*/ NULL,
- arg_image_policy ?: &image_policy_container,
- dissect_image_flags,
- &dissected_image);
- if (r == -ENOPKG) {
- /* dissected_image_and_warn() already printed a brief error message. Extend on that with more details */
- log_notice("Note that the disk image needs to\n"
- " a) either contain only a single MBR partition of type 0x83 that is marked bootable\n"
- " b) or contain a single GPT partition of type 0FC63DAF-8483-4772-8E79-3D69D8477DE4\n"
- " c) or follow https://uapi-group.org/specifications/specs/discoverable_partitions_specification\n"
- " d) or contain a file system without a partition table\n"
- "in order to be bootable with systemd-nspawn.");
- goto finish;
- }
- if (r < 0)
- goto finish;
+ r = dissect_loop_device_and_warn(
+ loop,
+ &arg_verity_settings,
+ /* mount_options=*/ NULL,
+ arg_image_policy ?: &image_policy_container,
+ dissect_image_flags,
+ &dissected_image);
+ if (r == -ENOPKG) {
+ /* dissected_image_and_warn() already printed a brief error message. Extend on that with more details */
+ log_notice("Note that the disk image needs to\n"
+ " a) either contain only a single MBR partition of type 0x83 that is marked bootable\n"
+ " b) or contain a single GPT partition of type 0FC63DAF-8483-4772-8E79-3D69D8477DE4\n"
+ " c) or follow https://uapi-group.org/specifications/specs/discoverable_partitions_specification\n"
+ " d) or contain a file system without a partition table\n"
+ "in order to be bootable with systemd-nspawn.");
+ goto finish;
+ }
+ if (r < 0)
+ goto finish;
- r = dissected_image_load_verity_sig_partition(
- dissected_image,
- loop->fd,
- &arg_verity_settings);
- if (r < 0)
- goto finish;
+ r = dissected_image_load_verity_sig_partition(
+ dissected_image,
+ loop->fd,
+ &arg_verity_settings);
+ if (r < 0)
+ goto finish;
- if (dissected_image->has_verity && !arg_verity_settings.root_hash && !dissected_image->has_verity_sig)
- log_notice("Note: image %s contains verity information, but no root hash specified and no embedded "
- "root hash signature found! Proceeding without integrity checking.", arg_image);
+ if (dissected_image->has_verity && !arg_verity_settings.root_hash && !dissected_image->has_verity_sig)
+ log_notice("Note: image %s contains verity information, but no root hash specified and no embedded "
+ "root hash signature found! Proceeding without integrity checking.", arg_image);
- r = dissected_image_decrypt_interactively(
- dissected_image,
- NULL,
- &arg_verity_settings,
- 0);
- if (r < 0)
- goto finish;
+ r = dissected_image_decrypt_interactively(
+ dissected_image,
+ NULL,
+ &arg_verity_settings,
+ dissect_image_flags);
+ if (r < 0)
+ goto finish;
+ } else {
+ _cleanup_free_ char *userns_name = strjoin("nspawn-", arg_machine);
+ if (!userns_name) {
+ r = log_oom();
+ goto finish;
+ }
+
+ /* if we are unprivileged, let's allocate a 64K userns first */
+ userns_fd = nsresource_allocate_userns(userns_name, UINT64_C(0x10000));
+ if (userns_fd < 0) {
+ r = log_error_errno(userns_fd, "Failed to allocate user namespace with 64K users: %m");
+ goto finish;
+ }
+
+ r = mountfsd_mount_image(
+ arg_image,
+ userns_fd,
+ arg_image_policy,
+ dissect_image_flags,
+ &dissected_image);
+ if (r < 0)
+ goto finish;
+ }
/* Now that we mounted the image, let's try to remove it again, if it is ephemeral */
if (remove_image && unlink(arg_image) >= 0)
@@ -5766,19 +6223,20 @@ static int run(int argc, char *argv[]) {
if (r < 0)
goto finish;
- if (arg_console_mode < 0)
- arg_console_mode =
- isatty(STDIN_FILENO) > 0 &&
- isatty(STDOUT_FILENO) > 0 ? CONSOLE_INTERACTIVE : CONSOLE_READ_ONLY;
+ if (!arg_quiet) {
+ const char *t = arg_image ?: arg_directory;
+ _cleanup_free_ char *u = NULL;
+ (void) terminal_urlify_path(t, t, &u);
- if (arg_console_mode == CONSOLE_PIPE) /* if we pass STDERR on to the container, don't add our own logs into it too */
- arg_quiet = true;
+ log_info("%s %sSpawning container %s on %s.%s",
+ special_glyph(SPECIAL_GLYPH_LIGHT_SHADE), ansi_grey(), arg_machine, u ?: t, ansi_normal());
- if (!arg_quiet)
- log_info("Spawning container %s on %s.\nPress Ctrl-] three times within 1s to kill container.",
- arg_machine, arg_image ?: arg_directory);
+ if (arg_console_mode == CONSOLE_INTERACTIVE)
+ log_info("%s %sPress %sCtrl-]%s three times within 1s to kill container.%s",
+ special_glyph(SPECIAL_GLYPH_LIGHT_SHADE), ansi_grey(), ansi_highlight(), ansi_grey(), ansi_normal());
+ }
- assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGCHLD, SIGWINCH, SIGTERM, SIGINT, SIGRTMIN+18, -1) >= 0);
+ assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGCHLD, SIGWINCH, SIGTERM, SIGINT, SIGRTMIN+18) >= 0);
r = make_reaper_process(true);
if (r < 0) {
@@ -5795,11 +6253,13 @@ static int run(int argc, char *argv[]) {
expose_args.fw_ctx = fw_ctx;
}
for (;;) {
- r = run_container(dissected_image,
- fds,
- veth_name, &veth_created,
- &expose_args, &master,
- &pid, &ret);
+ r = run_container(
+ dissected_image,
+ userns_fd,
+ fds,
+ veth_name, &veth_created,
+ &expose_args, &master,
+ &pid, &ret);
if (r <= 0)
break;
}
@@ -5841,25 +6301,30 @@ finish:
log_debug_errno(errno, "Can't remove temporary root directory '%s', ignoring: %m", tmprootdir);
}
- if (arg_machine) {
+ if (arg_machine && arg_privileged) {
const char *p;
p = strjoina("/run/systemd/nspawn/propagate/", arg_machine);
(void) rm_rf(p, REMOVE_ROOT);
+
+ p = strjoina("/run/systemd/nspawn/unix-export/", arg_machine);
+ (void) umount2(p, MNT_DETACH|UMOUNT_NOFOLLOW);
+ (void) rmdir(p);
}
expose_port_flush(&fw_ctx, arg_expose_ports, AF_INET, &expose_args.address4);
expose_port_flush(&fw_ctx, arg_expose_ports, AF_INET6, &expose_args.address6);
- if (veth_created)
- (void) remove_veth_links(veth_name, arg_network_veth_extra);
- (void) remove_bridge(arg_network_zone);
+ if (arg_privileged) {
+ if (veth_created)
+ (void) remove_veth_links(veth_name, arg_network_veth_extra);
+ (void) remove_bridge(arg_network_zone);
+ }
custom_mount_free_all(arg_custom_mounts, arg_n_custom_mounts);
expose_port_free_all(arg_expose_ports);
rlimit_free_all(arg_rlimit);
device_node_array_free(arg_extra_nodes, arg_n_extra_nodes);
- machine_credential_free_all(arg_credentials, arg_n_credentials);
if (r < 0)
return r;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-24 05:41:48 +0000