dilim/systemd
1
0
Fork 0
mirror of https://github.com/systemd/systemd.git synced 2026-07-19 22:10:56 +00:00
Code Issues Packages Projects Releases Wiki Activity
Files
df884b7de58128f75da161c235906daeddb46bbc
systemd/src/machine/machine-dbus.c
Lennart Poettering 42c8f1c761 machined: port to pty_open_peer_racefree()
2024-10-30 22:37:44 +01:00

1224 lines
43 KiB
C
Raw Blame History

/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <sys/mount.h>
#include <sys/wait.h>
#include "alloc-util.h"
#include "bus-common-errors.h"
#include "bus-get-properties.h"
#include "bus-internal.h"
#include "bus-label.h"
#include "bus-locator.h"
#include "bus-polkit.h"
#include "copy.h"
#include "env-file.h"
#include "env-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "format-util.h"
#include "fs-util.h"
#include "in-addr-util.h"
#include "local-addresses.h"
#include "machine-dbus.h"
#include "machine.h"
#include "missing_capability.h"
#include "mkdir.h"
#include "mount-util.h"
#include "mountpoint-util.h"
#include "namespace-util.h"
#include "os-util.h"
#include "path-util.h"
#include "process-util.h"
#include "signal-util.h"
#include "strv.h"
#include "terminal-util.h"
#include "tmpfile-util.h"
#include "user-util.h"
static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_class, machine_class, MachineClass);
static BUS_DEFINE_PROPERTY_GET2(property_get_state, "s", Machine, machine_get_state, machine_state_to_string);
static int property_get_netif(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
Machine *m = ASSERT_PTR(userdata);
assert(bus);
assert(reply);
assert_cc(sizeof(int) == sizeof(int32_t));
return sd_bus_message_append_array(reply, 'i', m->netif, m->n_netif * sizeof(int));
}
int bus_machine_method_unregister(sd_bus_message *message, void *userdata, sd_bus_error *error) {
Machine *m = ASSERT_PTR(userdata);
int r;
assert(message);
const char *details[] = {
"machine", m->name,
"verb", "unregister",
NULL
};
r = bus_verify_polkit_async(
message,
"org.freedesktop.machine1.manage-machines",
details,
&m->manager->polkit_registry,
error);
if (r < 0)
return r;
if (r == 0)
return 1; /* Will call us back */
r = machine_finalize(m);
if (r < 0)
return r;
return sd_bus_reply_method_return(message, NULL);
}
int bus_machine_method_terminate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
Machine *m = ASSERT_PTR(userdata);
int r;
assert(message);
const char *details[] = {
"machine", m->name,
"verb", "terminate",
NULL
};
r = bus_verify_polkit_async(
message,
"org.freedesktop.machine1.manage-machines",
details,
&m->manager->polkit_registry,
error);
if (r < 0)
return r;
if (r == 0)
return 1; /* Will call us back */
r = machine_stop(m);
if (r < 0)
return r;
return sd_bus_reply_method_return(message, NULL);
}
int bus_machine_method_kill(sd_bus_message *message, void *userdata, sd_bus_error *error) {
Machine *m = ASSERT_PTR(userdata);
const char *swho;
int32_t signo;
KillWhom whom;
int r;
assert(message);
r = sd_bus_message_read(message, "si", &swho, &signo);
if (r < 0)
return r;
if (isempty(swho))
whom = KILL_ALL;
else {
whom = kill_whom_from_string(swho);
if (whom < 0)
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid kill parameter '%s'", swho);
}
if (!SIGNAL_VALID(signo))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid signal %i", signo);
const char *details[] = {
"machine", m->name,
"verb", "kill",
NULL
};
r = bus_verify_polkit_async(
message,
"org.freedesktop.machine1.manage-machines",
details,
&m->manager->polkit_registry,
error);
if (r < 0)
return r;
if (r == 0)
return 1; /* Will call us back */
r = machine_kill(m, whom, signo);
if (r < 0)
return r;
return sd_bus_reply_method_return(message, NULL);
}
int bus_machine_method_get_addresses(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
_cleanup_free_ struct local_address *addresses = NULL;
Machine *m = ASSERT_PTR(userdata);
int r;
assert(message);
r = sd_bus_message_new_method_return(message, &reply);
if (r < 0)
return r;
r = sd_bus_message_open_container(reply, 'a', "(iay)");
if (r < 0)
return r;
int n = machine_get_addresses(m, &addresses);
if (n == -ENONET)
return sd_bus_error_setf(error, BUS_ERROR_NO_PRIVATE_NETWORKING, "Machine %s does not use private networking", m->name);
if (ERRNO_IS_NEG_NOT_SUPPORTED(n))
return sd_bus_error_set(error, SD_BUS_ERROR_NOT_SUPPORTED, "Requesting IP address data is only supported on container machines.");
if (n < 0)
return sd_bus_error_set_errnof(error, n, "Failed to get addresses: %m");
for (int i = 0; i < n; i++) {
r = sd_bus_message_open_container(reply, 'r', "iay");
if (r < 0)
return r;
r = sd_bus_message_append(reply, "i", addresses[i].family);
if (r < 0)
return r;
r = sd_bus_message_append_array(reply, 'y', &addresses[i].address, FAMILY_ADDRESS_SIZE(addresses[i].family));
if (r < 0)
return r;
r = sd_bus_message_close_container(reply);
if (r < 0)
return r;
}
r = sd_bus_message_close_container(reply);
if (r < 0)
return r;
return sd_bus_send(NULL, reply, NULL);
}
int bus_machine_method_get_ssh_info(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
Machine *m = ASSERT_PTR(userdata);
int r;
assert(message);
r = sd_bus_message_new_method_return(message, &reply);
if (r < 0)
return r;
if (!m->ssh_address || !m->ssh_private_key_path)
return -ENOENT;
r = sd_bus_message_append(reply, "ss", m->ssh_address, m->ssh_private_key_path);
if (r < 0)
return r;
return sd_bus_send(NULL, reply, NULL);
}
int bus_machine_method_get_os_release(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_strv_free_ char **l = NULL;
Machine *m = ASSERT_PTR(userdata);
int r;
assert(message);
r = machine_get_os_release(m, &l);
if (r == -ENONET)
return sd_bus_error_set(error, SD_BUS_ERROR_FAILED, "Machine does not contain OS release information.");
if (ERRNO_IS_NEG_NOT_SUPPORTED(r))
return sd_bus_error_set(error, SD_BUS_ERROR_NOT_SUPPORTED, "Requesting OS release data is only supported on container machines.");
if (r < 0)
return sd_bus_error_set_errnof(error, r, "Failed to get OS release: %m");
return bus_reply_pair_array(message, l);
}
int bus_machine_method_open_pty(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
_cleanup_free_ char *pty_name = NULL;
_cleanup_close_ int master = -EBADF;
Machine *m = ASSERT_PTR(userdata);
int r;
assert(message);
const char *details[] = {
"machine", m->name,
NULL
};
r = bus_verify_polkit_async(
message,
m->class == MACHINE_HOST ? "org.freedesktop.machine1.host-open-pty" : "org.freedesktop.machine1.open-pty",
details,
&m->manager->polkit_registry,
error);
if (r < 0)
return r;
if (r == 0)
return 1; /* Will call us back */
master = machine_openpt(m, O_RDWR|O_NOCTTY|O_CLOEXEC, &pty_name);
if (master < 0)
return master;
r = sd_bus_message_new_method_return(message, &reply);
if (r < 0)
return r;
r = sd_bus_message_append(reply, "hs", master, pty_name);
if (r < 0)
return r;
return sd_bus_send(NULL, reply, NULL);
}
static int container_bus_new(Machine *m, sd_bus_error *error, sd_bus **ret) {
int r;
assert(m);
assert(ret);
switch (m->class) {
case MACHINE_HOST:
*ret = NULL;
break;
case MACHINE_CONTAINER: {
_cleanup_(sd_bus_close_unrefp) sd_bus *bus = NULL;
char *address;
r = sd_bus_new(&bus);
if (r < 0)
return r;
if (asprintf(&address, "x-machine-unix:pid=%" PID_PRI, m->leader.pid) < 0)
return -ENOMEM;
bus->address = address;
bus->bus_client = true;
bus->trusted = false;
bus->runtime_scope = RUNTIME_SCOPE_SYSTEM;
r = sd_bus_start(bus);
if (r == -ENOENT)
return sd_bus_error_set_errnof(error, r, "There is no system bus in container %s.", m->name);
if (r < 0)
return r;
*ret = TAKE_PTR(bus);
break;
}
default:
return -EOPNOTSUPP;
}
return 0;
}
int bus_machine_method_open_login(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
_cleanup_free_ char *pty_name = NULL;
_cleanup_(sd_bus_flush_close_unrefp) sd_bus *allocated_bus = NULL;
_cleanup_close_ int master = -EBADF;
sd_bus *container_bus = NULL;
Machine *m = ASSERT_PTR(userdata);
const char *p, *getty;
int r;
assert(message);
const char *details[] = {
"machine", m->name,
"verb", "login",
NULL
};
r = bus_verify_polkit_async(
message,
m->class == MACHINE_HOST ? "org.freedesktop.machine1.host-login" : "org.freedesktop.machine1.login",
details,
&m->manager->polkit_registry,
error);
if (r < 0)
return r;
if (r == 0)
return 1; /* Will call us back */
master = machine_openpt(m, O_RDWR|O_NOCTTY|O_CLOEXEC, &pty_name);
if (master < 0)
return master;
p = path_startswith(pty_name, "/dev/pts/");
assert(p);
r = container_bus_new(m, error, &allocated_bus);
if (r < 0)
return r;
container_bus = allocated_bus ?: m->manager->bus;
getty = strjoina("container-getty@", p, ".service");
r = bus_call_method(container_bus, bus_systemd_mgr, "StartUnit", error, NULL, "ss", getty, "replace");
if (r < 0)
return r;
r = sd_bus_message_new_method_return(message, &reply);
if (r < 0)
return r;
r = sd_bus_message_append(reply, "hs", master, pty_name);
if (r < 0)
return r;
return sd_bus_send(NULL, reply, NULL);
}
int bus_machine_method_open_shell(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL, *tm = NULL;
_cleanup_free_ char *pty_name = NULL;
_cleanup_(sd_bus_flush_close_unrefp) sd_bus *allocated_bus = NULL;
sd_bus *container_bus = NULL;
_cleanup_close_ int master = -EBADF, slave = -EBADF;
_cleanup_strv_free_ char **env = NULL, **args_wire = NULL, **args = NULL;
_cleanup_free_ char *command_line = NULL;
Machine *m = ASSERT_PTR(userdata);
const char *unit, *user, *path, *description, *utmp_id;
int r;
assert(message);
r = sd_bus_message_read(message, "ss", &user, &path);
if (r < 0)
return r;
user = isempty(user) ? "root" : user;
r = sd_bus_message_read_strv(message, &args_wire);
if (r < 0)
return r;
if (isempty(path)) {
path = "/bin/sh";
args = new0(char*, 3 + 1);
if (!args)
return -ENOMEM;
args[0] = strdup("sh");
if (!args[0])
return -ENOMEM;
args[1] = strdup("-c");
if (!args[1])
return -ENOMEM;
r = asprintf(&args[2],
"shell=$(getent passwd %s 2>/dev/null | { IFS=: read _ _ _ _ _ _ x; echo \"$x\"; })\n"\
"exec \"${shell:-/bin/sh}\" -l", /* -l is means --login */
user);
if (r < 0) {
args[2] = NULL;
return -ENOMEM;
}
} else {
if (!path_is_absolute(path))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Specified path '%s' is not absolute", path);
args = TAKE_PTR(args_wire);
if (strv_isempty(args)) {
args = strv_free(args);
args = strv_new(path);
if (!args)
return -ENOMEM;
}
}
r = sd_bus_message_read_strv(message, &env);
if (r < 0)
return r;
if (!strv_env_is_valid(env))
return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid environment assignments");
command_line = strv_join(args, " ");
if (!command_line)
return -ENOMEM;
const char *details[] = {
"machine", m->name,
"user", user,
"program", path,
"command_line", command_line,
NULL
};
r = bus_verify_polkit_async(
message,
m->class == MACHINE_HOST ? "org.freedesktop.machine1.host-shell" : "org.freedesktop.machine1.shell",
details,
&m->manager->polkit_registry,
error);
if (r < 0)
return r;
if (r == 0)
return 1; /* Will call us back */
master = machine_openpt(m, O_RDWR|O_NOCTTY|O_CLOEXEC, &pty_name);
if (master < 0)
return master;
/* First try to get an fd for the PTY peer via the new racefree ioctl(), directly. Otherwise go via
* joining the namespace, because it goes by path */
slave = pty_open_peer_racefree(master, O_RDWR|O_NOCTTY|O_CLOEXEC);
if (ERRNO_IS_NEG_NOT_SUPPORTED(slave))
slave = machine_open_terminal(m, pty_name, O_RDWR|O_NOCTTY|O_CLOEXEC);
if (slave < 0)
return slave;
utmp_id = path_startswith(pty_name, "/dev/");
assert(utmp_id);
r = container_bus_new(m, error, &allocated_bus);
if (r < 0)
return r;
container_bus = allocated_bus ?: m->manager->bus;
r = bus_message_new_method_call(container_bus, &tm, bus_systemd_mgr, "StartTransientUnit");
if (r < 0)
return r;
/* Name and mode */
const char *p = ASSERT_PTR(path_startswith(pty_name, "/dev/pts/"));
unit = strjoina("container-shell@", p, ".service");
r = sd_bus_message_append(tm, "ss", unit, "fail");
if (r < 0)
return r;
/* Properties */
r = sd_bus_message_open_container(tm, 'a', "(sv)");
if (r < 0)
return r;
description = strjoina("Shell for User ", user);
r = sd_bus_message_append(tm,
"(sv)(sv)(sv)(sv)(sv)(sv)(sv)(sv)(sv)(sv)(sv)(sv)(sv)",
"Description", "s", description,
"StandardInputFileDescriptor", "h", slave,
"StandardOutputFileDescriptor", "h", slave,
"StandardErrorFileDescriptor", "h", slave,
"SendSIGHUP", "b", true,
"IgnoreSIGPIPE", "b", false,
"KillMode", "s", "mixed",
"TTYPath", "s", pty_name,
"TTYReset", "b", true,
"UtmpIdentifier", "s", utmp_id,
"UtmpMode", "s", "user",
"PAMName", "s", "login",
"WorkingDirectory", "s", "-~");
if (r < 0)
return r;
r = sd_bus_message_append(tm, "(sv)", "User", "s", user);
if (r < 0)
return r;
if (!strv_isempty(env)) {
r = sd_bus_message_open_container(tm, 'r', "sv");
if (r < 0)
return r;
r = sd_bus_message_append(tm, "s", "Environment");
if (r < 0)
return r;
r = sd_bus_message_open_container(tm, 'v', "as");
if (r < 0)
return r;
r = sd_bus_message_append_strv(tm, env);
if (r < 0)
return r;
r = sd_bus_message_close_container(tm);
if (r < 0)
return r;
r = sd_bus_message_close_container(tm);
if (r < 0)
return r;
}
/* Exec container */
r = sd_bus_message_open_container(tm, 'r', "sv");
if (r < 0)
return r;
r = sd_bus_message_append(tm, "s", "ExecStart");
if (r < 0)
return r;
r = sd_bus_message_open_container(tm, 'v', "a(sasb)");
if (r < 0)
return r;
r = sd_bus_message_open_container(tm, 'a', "(sasb)");
if (r < 0)
return r;
r = sd_bus_message_open_container(tm, 'r', "sasb");
if (r < 0)
return r;
r = sd_bus_message_append(tm, "s", path);
if (r < 0)
return r;
r = sd_bus_message_append_strv(tm, args);
if (r < 0)
return r;
r = sd_bus_message_append(tm, "b", true);
if (r < 0)
return r;
r = sd_bus_message_close_container(tm);
if (r < 0)
return r;
r = sd_bus_message_close_container(tm);
if (r < 0)
return r;
r = sd_bus_message_close_container(tm);
if (r < 0)
return r;
r = sd_bus_message_close_container(tm);
if (r < 0)
return r;
r = sd_bus_message_close_container(tm);
if (r < 0)
return r;
/* Auxiliary units */
r = sd_bus_message_append(tm, "a(sa(sv))", 0);
if (r < 0)
return r;
r = sd_bus_call(container_bus, tm, 0, error, NULL);
if (r < 0)
return r;
slave = safe_close(slave);
r = sd_bus_message_new_method_return(message, &reply);
if (r < 0)
return r;
r = sd_bus_message_append(reply, "hs", master, pty_name);
if (r < 0)
return r;
return sd_bus_send(NULL, reply, NULL);
}
int bus_machine_method_bind_mount(sd_bus_message *message, void *userdata, sd_bus_error *error) {
int read_only, make_file_or_directory;
const char *dest, *src, *propagate_directory;
Machine *m = ASSERT_PTR(userdata);
MountInNamespaceFlags flags = 0;
uid_t uid;
int r;
assert(message);
if (m->class != MACHINE_CONTAINER)
return sd_bus_error_set(error, SD_BUS_ERROR_NOT_SUPPORTED, "Bind mounting is only supported on container machines.");
r = sd_bus_message_read(message, "ssbb", &src, &dest, &read_only, &make_file_or_directory);
if (r < 0)
return r;
if (!path_is_absolute(src) || !path_is_normalized(src))
return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Source path must be absolute and normalized.");
if (isempty(dest))
dest = src;
else if (!path_is_absolute(dest) || !path_is_normalized(dest))
return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Destination path must be absolute and normalized.");
const char *details[] = {
"machine", m->name,
"verb", "bind",
"src", src,
"dest", dest,
NULL
};
r = bus_verify_polkit_async(
message,
"org.freedesktop.machine1.manage-machines",
details,
&m->manager->polkit_registry,
error);
if (r < 0)
return r;
if (r == 0)
return 1; /* Will call us back */
r = machine_get_uid_shift(m, &uid);
if (r < 0)
return r;
if (uid != 0)
return sd_bus_error_set(error, SD_BUS_ERROR_NOT_SUPPORTED, "Can't bind mount on container with user namespacing applied.");
if (read_only)
flags |= MOUNT_IN_NAMESPACE_READ_ONLY;
if (make_file_or_directory)
flags |= MOUNT_IN_NAMESPACE_MAKE_FILE_OR_DIRECTORY;
propagate_directory = strjoina("/run/systemd/nspawn/propagate/", m->name);
r = bind_mount_in_namespace(
&m->leader,
propagate_directory,
"/run/host/incoming/",
src, dest,
flags);
if (r < 0)
return sd_bus_error_set_errnof(error, r, "Failed to mount %s on %s in machine's namespace: %m", src, dest);
return sd_bus_reply_method_return(message, NULL);
}
int bus_machine_method_copy(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_free_ char *host_basename = NULL, *container_basename = NULL;
const char *src, *dest, *host_path, *container_path;
_cleanup_close_pair_ int errno_pipe_fd[2] = EBADF_PAIR;
CopyFlags copy_flags = COPY_REFLINK|COPY_MERGE|COPY_HARDLINKS;
_cleanup_close_ int hostfd = -EBADF;
Machine *m = ASSERT_PTR(userdata);
bool copy_from;
pid_t child;
uid_t uid_shift;
int r;
assert(message);
if (m->manager->n_operations >= OPERATIONS_MAX)
return sd_bus_error_set(error, SD_BUS_ERROR_LIMITS_EXCEEDED, "Too many ongoing copies.");
if (m->class != MACHINE_CONTAINER)
return sd_bus_error_set(error, SD_BUS_ERROR_NOT_SUPPORTED, "Copying files is only supported on container machines.");
r = sd_bus_message_read(message, "ss", &src, &dest);
if (r < 0)
return r;
if (endswith(sd_bus_message_get_member(message), "WithFlags")) {
uint64_t raw_flags;
r = sd_bus_message_read(message, "t", &raw_flags);
if (r < 0)
return r;
if ((raw_flags & ~_MACHINE_COPY_FLAGS_MASK_PUBLIC) != 0)
return -EINVAL;
if (raw_flags & MACHINE_COPY_REPLACE)
copy_flags |= COPY_REPLACE;
}
if (!path_is_absolute(src))
return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Source path must be absolute.");
if (isempty(dest))
dest = src;
else if (!path_is_absolute(dest))
return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Destination path must be absolute.");
const char *details[] = {
"machine", m->name,
"verb", "copy",
"src", src,
"dest", dest,
NULL
};
r = bus_verify_polkit_async(
message,
"org.freedesktop.machine1.manage-machines",
details,
&m->manager->polkit_registry,
error);
if (r < 0)
return r;
if (r == 0)
return 1; /* Will call us back */
r = machine_get_uid_shift(m, &uid_shift);
if (r < 0)
return r;
copy_from = strstr(sd_bus_message_get_member(message), "CopyFrom");
if (copy_from) {
container_path = src;
host_path = dest;
} else {
host_path = src;
container_path = dest;
}
r = path_extract_filename(host_path, &host_basename);
if (r < 0)
return sd_bus_error_set_errnof(error, r, "Failed to extract file name of '%s' path: %m", host_path);
r = path_extract_filename(container_path, &container_basename);
if (r < 0)
return sd_bus_error_set_errnof(error, r, "Failed to extract file name of '%s' path: %m", container_path);
hostfd = open_parent(host_path, O_CLOEXEC, 0);
if (hostfd < 0)
return sd_bus_error_set_errnof(error, hostfd, "Failed to open host directory %s: %m", host_path);
if (pipe2(errno_pipe_fd, O_CLOEXEC|O_NONBLOCK) < 0)
return sd_bus_error_set_errnof(error, errno, "Failed to create pipe: %m");
r = safe_fork("(sd-copy)", FORK_RESET_SIGNALS, &child);
if (r < 0)
return sd_bus_error_set_errnof(error, r, "Failed to fork(): %m");
if (r == 0) {
int containerfd;
const char *q;
int mntfd;
errno_pipe_fd[0] = safe_close(errno_pipe_fd[0]);
q = procfs_file_alloca(m->leader.pid, "ns/mnt");
mntfd = open(q, O_RDONLY|O_NOCTTY|O_CLOEXEC);
if (mntfd < 0) {
r = log_error_errno(errno, "Failed to open mount namespace of leader: %m");
goto child_fail;
}
if (setns(mntfd, CLONE_NEWNS) < 0) {
r = log_error_errno(errno, "Failed to join namespace of leader: %m");
goto child_fail;
}
containerfd = open_parent(container_path, O_CLOEXEC, 0);
if (containerfd < 0) {
r = log_error_errno(containerfd, "Failed to open destination directory: %m");
goto child_fail;
}
/* Run the actual copy operation. Note that when a UID shift is set we'll either clamp the UID/GID to
* 0 or to the actual UID shift depending on the direction we copy. If no UID shift is set we'll copy
* the UID/GIDs as they are. */
if (copy_from)
r = copy_tree_at(containerfd, container_basename, hostfd, host_basename, uid_shift == 0 ? UID_INVALID : 0, uid_shift == 0 ? GID_INVALID : 0, copy_flags, NULL, NULL);
else
r = copy_tree_at(hostfd, host_basename, containerfd, container_basename, uid_shift == 0 ? UID_INVALID : uid_shift, uid_shift == 0 ? GID_INVALID : uid_shift, copy_flags, NULL, NULL);
hostfd = safe_close(hostfd);
containerfd = safe_close(containerfd);
if (r < 0) {
r = log_error_errno(r, "Failed to copy tree: %m");
goto child_fail;
}
_exit(EXIT_SUCCESS);
child_fail:
(void) write(errno_pipe_fd[1], &r, sizeof(r));
_exit(EXIT_FAILURE);
}
errno_pipe_fd[1] = safe_close(errno_pipe_fd[1]);
/* Copying might take a while, hence install a watch on the child, and return */
r = operation_new_with_bus_reply(m->manager, m, child, message, errno_pipe_fd[0], /* ret= */ NULL);
if (r < 0) {
(void) sigkill_wait(child);
return r;
}
errno_pipe_fd[0] = -EBADF;
return 1;
}
int bus_machine_method_open_root_directory(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_close_ int fd = -EBADF;
Machine *m = ASSERT_PTR(userdata);
int r;
assert(message);
const char *details[] = {
"machine", m->name,
"verb", "open_root_directory",
NULL
};
r = bus_verify_polkit_async(
message,
"org.freedesktop.machine1.manage-machines",
details,
&m->manager->polkit_registry,
error);
if (r < 0)
return r;
if (r == 0)
return 1; /* Will call us back */
switch (m->class) {
case MACHINE_HOST:
fd = open("/", O_RDONLY|O_CLOEXEC|O_DIRECTORY);
if (fd < 0)
return -errno;
break;
case MACHINE_CONTAINER: {
_cleanup_close_ int mntns_fd = -EBADF, root_fd = -EBADF;
_cleanup_close_pair_ int pair[2] = EBADF_PAIR;
pid_t child;
r = pidref_namespace_open(&m->leader,
/* ret_pidns_fd = */ NULL,
&mntns_fd,
/* ret_netns_fd = */ NULL,
/* ret_userns_fd = */ NULL,
&root_fd);
if (r < 0)
return r;
if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0)
return -errno;
r = namespace_fork("(sd-openrootns)", "(sd-openroot)", NULL, 0, FORK_RESET_SIGNALS|FORK_DEATHSIG_SIGKILL,
-1, mntns_fd, -1, -1, root_fd, &child);
if (r < 0)
return sd_bus_error_set_errnof(error, r, "Failed to fork(): %m");
if (r == 0) {
_cleanup_close_ int dfd = -EBADF;
pair[0] = safe_close(pair[0]);
dfd = open("/", O_RDONLY|O_CLOEXEC|O_DIRECTORY);
if (dfd < 0)
_exit(EXIT_FAILURE);
r = send_one_fd(pair[1], dfd, 0);
dfd = safe_close(dfd);
if (r < 0)
_exit(EXIT_FAILURE);
_exit(EXIT_SUCCESS);
}
pair[1] = safe_close(pair[1]);
r = wait_for_terminate_and_check("(sd-openrootns)", child, 0);
if (r < 0)
return sd_bus_error_set_errnof(error, r, "Failed to wait for child: %m");
if (r != EXIT_SUCCESS)
return sd_bus_error_set(error, SD_BUS_ERROR_FAILED, "Child died abnormally.");
fd = receive_one_fd(pair[0], MSG_DONTWAIT);
if (fd < 0)
return fd;
break;
}
default:
return sd_bus_error_set(error, SD_BUS_ERROR_NOT_SUPPORTED, "Opening the root directory is only supported on container machines.");
}
return sd_bus_reply_method_return(message, "h", fd);
}
int bus_machine_method_get_uid_shift(sd_bus_message *message, void *userdata, sd_bus_error *error) {
Machine *m = ASSERT_PTR(userdata);
uid_t shift = 0;
int r;
assert(message);
/* You wonder why this is a method and not a property? Well, properties are not supposed to return errors, but
* we kinda have to for this. */
if (m->class == MACHINE_HOST)
return sd_bus_reply_method_return(message, "u", UINT32_C(0));
if (m->class != MACHINE_CONTAINER)
return sd_bus_error_set(error, SD_BUS_ERROR_NOT_SUPPORTED, "UID/GID shift may only be determined for container machines.");
r = machine_get_uid_shift(m, &shift);
if (r == -ENXIO)
return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Machine %s uses a complex UID/GID mapping, cannot determine shift", m->name);
if (r < 0)
return r;
return sd_bus_reply_method_return(message, "u", (uint32_t) shift);
}
static int machine_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
Manager *m = ASSERT_PTR(userdata);
Machine *machine;
int r;
assert(bus);
assert(path);
assert(interface);
assert(found);
if (streq(path, "/org/freedesktop/machine1/machine/self")) {
_cleanup_(pidref_done) PidRef pidref = PIDREF_NULL;
_cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
sd_bus_message *message;
message = sd_bus_get_current_message(bus);
if (!message)
return 0;
r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_PID|SD_BUS_CREDS_PIDFD, &creds);
if (r < 0)
return r;
r = bus_creds_get_pidref(creds, &pidref);
if (r < 0)
return r;
r = manager_get_machine_by_pidref(m, &pidref, &machine);
if (r <= 0)
return 0;
} else {
_cleanup_free_ char *e = NULL;
const char *p;
p = startswith(path, "/org/freedesktop/machine1/machine/");
if (!p)
return 0;
e = bus_label_unescape(p);
if (!e)
return -ENOMEM;
machine = hashmap_get(m->machines, e);
if (!machine)
return 0;
}
*found = machine;
return 1;
}
char* machine_bus_path(Machine *m) {
_cleanup_free_ char *e = NULL;
assert(m);
e = bus_label_escape(m->name);
if (!e)
return NULL;
return strjoin("/org/freedesktop/machine1/machine/", e);
}
static int machine_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
_cleanup_strv_free_ char **l = NULL;
Machine *machine = NULL;
Manager *m = userdata;
int r;
assert(bus);
assert(path);
assert(nodes);
HASHMAP_FOREACH(machine, m->machines) {
char *p;
p = machine_bus_path(machine);
if (!p)
return -ENOMEM;
r = strv_consume(&l, p);
if (r < 0)
return r;
}
*nodes = TAKE_PTR(l);
return 1;
}
static const sd_bus_vtable machine_vtable[] = {
SD_BUS_VTABLE_START(0),
SD_BUS_PROPERTY("Name", "s", NULL, offsetof(Machine, name), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("Id", "ay", bus_property_get_id128, offsetof(Machine, id), SD_BUS_VTABLE_PROPERTY_CONST),
BUS_PROPERTY_DUAL_TIMESTAMP("Timestamp", offsetof(Machine, timestamp), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("Service", "s", NULL, offsetof(Machine, service), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("Unit", "s", NULL, offsetof(Machine, unit), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("Scope", "s", NULL, offsetof(Machine, unit), SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_HIDDEN),
SD_BUS_PROPERTY("Leader", "u", NULL, offsetof(Machine, leader.pid), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("Class", "s", property_get_class, offsetof(Machine, class), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("RootDirectory", "s", NULL, offsetof(Machine, root_directory), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("NetworkInterfaces", "ai", property_get_netif, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("VSockCID", "u", NULL, offsetof(Machine, vsock_cid), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("SSHAddress", "s", NULL, offsetof(Machine, ssh_address), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("SSHPrivateKeyPath", "s", NULL, offsetof(Machine, ssh_private_key_path), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("State", "s", property_get_state, 0, 0),
SD_BUS_METHOD("Terminate",
NULL,
NULL,
bus_machine_method_terminate,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("Kill",
SD_BUS_ARGS("s", whom, "i", signal),
SD_BUS_NO_RESULT,
bus_machine_method_kill,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("GetAddresses",
SD_BUS_NO_ARGS,
SD_BUS_RESULT("a(iay)", addresses),
bus_machine_method_get_addresses,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("GetSSHInfo",
SD_BUS_NO_ARGS,
SD_BUS_RESULT("s", ssh_address, "s", ssh_private_key_path),
bus_machine_method_get_ssh_info,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("GetOSRelease",
SD_BUS_NO_ARGS,
SD_BUS_RESULT("a{ss}", fields),
bus_machine_method_get_os_release,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("GetUIDShift",
SD_BUS_NO_ARGS,
SD_BUS_RESULT("u", shift),
bus_machine_method_get_uid_shift,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("OpenPTY",
SD_BUS_NO_ARGS,
SD_BUS_RESULT("h", pty, "s", pty_path),
bus_machine_method_open_pty,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("OpenLogin",
SD_BUS_NO_ARGS,
SD_BUS_RESULT("h", pty, "s", pty_path),
bus_machine_method_open_login,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("OpenShell",
SD_BUS_ARGS("s", user, "s", path, "as", args, "as", environment),
SD_BUS_RESULT("h", pty, "s", pty_path),
bus_machine_method_open_shell,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("BindMount",
SD_BUS_ARGS("s", source, "s", destination, "b", read_only, "b", mkdir),
SD_BUS_NO_RESULT,
bus_machine_method_bind_mount,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("CopyFrom",
SD_BUS_ARGS("s", source, "s", destination),
SD_BUS_NO_RESULT,
bus_machine_method_copy,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("CopyTo",
SD_BUS_ARGS("s", source, "s", destination),
SD_BUS_NO_RESULT,
bus_machine_method_copy,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("CopyFromWithFlags",
SD_BUS_ARGS("s", source, "s", destination, "t", flags),
SD_BUS_NO_RESULT,
bus_machine_method_copy,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("CopyToWithFlags",
SD_BUS_ARGS("s", source, "s", destination, "t", flags),
SD_BUS_NO_RESULT,
bus_machine_method_copy,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("OpenRootDirectory",
SD_BUS_NO_ARGS,
SD_BUS_RESULT("h", fd),
bus_machine_method_open_root_directory,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_VTABLE_END
};
const BusObjectImplementation machine_object = {
"/org/freedesktop/machine1/machine",
"org.freedesktop.machine1.Machine",
.fallback_vtables = BUS_FALLBACK_VTABLES({machine_vtable, machine_object_find}),
.node_enumerator = machine_node_enumerator,
};
int machine_send_signal(Machine *m, bool new_machine) {
_cleanup_free_ char *p = NULL;
assert(m);
p = machine_bus_path(m);
if (!p)
return -ENOMEM;
return sd_bus_emit_signal(
m->manager->bus,
"/org/freedesktop/machine1",
"org.freedesktop.machine1.Manager",
new_machine ? "MachineNew" : "MachineRemoved",
"so", m->name, p);
}
int machine_send_create_reply(Machine *m, sd_bus_error *error) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *c = NULL;
_cleanup_free_ char *p = NULL;
assert(m);
if (!m->create_message)
return 0;
c = TAKE_PTR(m->create_message);
if (error)
return sd_bus_reply_method_error(c, error);
/* Update the machine state file before we notify the client
* about the result. */
machine_save(m);
p = machine_bus_path(m);
if (!p)
return -ENOMEM;
return sd_bus_reply_method_return(c, "o", p);
}
Reference in New Issue View Git Blame Copy Permalink