/* SPDX-License-Identifier: LGPL-2.1+ */ #include #include #include #include /* When we include libgen.h because we need dirname() we immediately * undefine basename() since libgen.h defines it as a macro to the POSIX * version which is really broken. We prefer GNU basename(). */ #include #undef basename #include "alloc-util.h" #include "bus-common-errors.h" #include "bus-internal.h" #include "bus-label.h" #include "bus-util.h" #include "copy.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 "mkdir.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 "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 = userdata; assert(bus); assert(reply); assert(m); 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_terminate(sd_bus_message *message, void *userdata, sd_bus_error *error) { Machine *m = userdata; int r; assert(message); assert(m); r = bus_verify_polkit_async( message, CAP_KILL, "org.freedesktop.machine1.manage-machines", NULL, false, UID_INVALID, &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 = userdata; const char *swho; int32_t signo; KillWho who; int r; assert(message); assert(m); r = sd_bus_message_read(message, "si", &swho, &signo); if (r < 0) return r; if (isempty(swho)) who = KILL_ALL; else { who = kill_who_from_string(swho); if (who < 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); r = bus_verify_polkit_async( message, CAP_KILL, "org.freedesktop.machine1.manage-machines", NULL, false, UID_INVALID, &m->manager->polkit_registry, error); if (r < 0) return r; if (r == 0) return 1; /* Will call us back */ r = machine_kill(m, who, 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; Machine *m = userdata; int r; assert(message); assert(m); 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; switch (m->class) { case MACHINE_HOST: { _cleanup_free_ struct local_address *addresses = NULL; struct local_address *a; int n, i; n = local_addresses(NULL, 0, AF_UNSPEC, &addresses); if (n < 0) return n; for (a = addresses, i = 0; i < n; a++, 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; } break; } case MACHINE_CONTAINER: { _cleanup_close_pair_ int pair[2] = { -1, -1 }; _cleanup_free_ char *us = NULL, *them = NULL; _cleanup_close_ int netns_fd = -1; const char *p; pid_t child; r = readlink_malloc("/proc/self/ns/net", &us); if (r < 0) return r; p = procfs_file_alloca(m->leader, "ns/net"); r = readlink_malloc(p, &them); if (r < 0) return r; if (streq(us, them)) return sd_bus_error_setf(error, BUS_ERROR_NO_PRIVATE_NETWORKING, "Machine %s does not use private networking", m->name); r = namespace_open(m->leader, NULL, NULL, &netns_fd, NULL, NULL); if (r < 0) return r; if (socketpair(AF_UNIX, SOCK_SEQPACKET, 0, pair) < 0) return -errno; r = safe_fork("(sd-addr)", FORK_RESET_SIGNALS|FORK_DEATHSIG, &child); if (r < 0) return sd_bus_error_set_errnof(error, r, "Failed to fork(): %m"); if (r == 0) { _cleanup_free_ struct local_address *addresses = NULL; struct local_address *a; int i, n; pair[0] = safe_close(pair[0]); r = namespace_enter(-1, -1, netns_fd, -1, -1); if (r < 0) _exit(EXIT_FAILURE); n = local_addresses(NULL, 0, AF_UNSPEC, &addresses); if (n < 0) _exit(EXIT_FAILURE); for (a = addresses, i = 0; i < n; a++, i++) { struct iovec iov[2] = { { .iov_base = &a->family, .iov_len = sizeof(a->family) }, { .iov_base = &a->address, .iov_len = FAMILY_ADDRESS_SIZE(a->family) }, }; r = writev(pair[1], iov, 2); if (r < 0) _exit(EXIT_FAILURE); } pair[1] = safe_close(pair[1]); _exit(EXIT_SUCCESS); } pair[1] = safe_close(pair[1]); for (;;) { int family; ssize_t n; union in_addr_union in_addr; struct iovec iov[2]; struct msghdr mh = { .msg_iov = iov, .msg_iovlen = 2, }; iov[0] = (struct iovec) { .iov_base = &family, .iov_len = sizeof(family) }; iov[1] = (struct iovec) { .iov_base = &in_addr, .iov_len = sizeof(in_addr) }; n = recvmsg(pair[0], &mh, 0); if (n < 0) return -errno; if ((size_t) n < sizeof(family)) break; r = sd_bus_message_open_container(reply, 'r', "iay"); if (r < 0) return r; r = sd_bus_message_append(reply, "i", family); if (r < 0) return r; switch (family) { case AF_INET: if (n != sizeof(struct in_addr) + sizeof(family)) return -EIO; r = sd_bus_message_append_array(reply, 'y', &in_addr.in, sizeof(in_addr.in)); break; case AF_INET6: if (n != sizeof(struct in6_addr) + sizeof(family)) return -EIO; r = sd_bus_message_append_array(reply, 'y', &in_addr.in6, sizeof(in_addr.in6)); break; } if (r < 0) return r; r = sd_bus_message_close_container(reply); if (r < 0) return r; } r = wait_for_terminate_and_check("(sd-addr)", 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_setf(error, SD_BUS_ERROR_FAILED, "Child died abnormally."); break; } default: return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Requesting IP address data is only supported on container machines."); } r = sd_bus_message_close_container(reply); if (r < 0) return r; return sd_bus_send(NULL, reply, NULL); } #define EXIT_NOT_FOUND 2 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 = userdata; int r; assert(message); assert(m); switch (m->class) { case MACHINE_HOST: r = load_os_release_pairs(NULL, &l); if (r < 0) return r; break; case MACHINE_CONTAINER: { _cleanup_close_ int mntns_fd = -1, root_fd = -1; _cleanup_close_pair_ int pair[2] = { -1, -1 }; _cleanup_fclose_ FILE *f = NULL; pid_t child; r = namespace_open(m->leader, NULL, &mntns_fd, NULL, NULL, &root_fd); if (r < 0) return r; if (socketpair(AF_UNIX, SOCK_SEQPACKET, 0, pair) < 0) return -errno; r = safe_fork("(sd-osrel)", FORK_RESET_SIGNALS|FORK_DEATHSIG, &child); if (r < 0) return sd_bus_error_set_errnof(error, r, "Failed to fork(): %m"); if (r == 0) { int fd = -1; pair[0] = safe_close(pair[0]); r = namespace_enter(-1, mntns_fd, -1, -1, root_fd); if (r < 0) _exit(EXIT_FAILURE); r = open_os_release(NULL, NULL, &fd); if (r == -ENOENT) _exit(EXIT_NOT_FOUND); if (r < 0) _exit(EXIT_FAILURE); r = copy_bytes(fd, pair[1], (uint64_t) -1, 0); if (r < 0) _exit(EXIT_FAILURE); _exit(EXIT_SUCCESS); } pair[1] = safe_close(pair[1]); f = fdopen(pair[0], "re"); if (!f) return -errno; pair[0] = -1; r = load_env_file_pairs(f, "/etc/os-release", NULL, &l); if (r < 0) return r; r = wait_for_terminate_and_check("(sd-osrel)", child, 0); if (r < 0) return sd_bus_error_set_errnof(error, r, "Failed to wait for child: %m"); if (r == EXIT_NOT_FOUND) return sd_bus_error_setf(error, SD_BUS_ERROR_FAILED, "Machine does not contain OS release information"); if (r != EXIT_SUCCESS) return sd_bus_error_setf(error, SD_BUS_ERROR_FAILED, "Child died abnormally."); break; } default: return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Requesting OS release data is only supported on container machines."); } 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 = -1; Machine *m = userdata; int r; assert(message); assert(m); r = bus_verify_polkit_async( message, CAP_SYS_ADMIN, m->class == MACHINE_HOST ? "org.freedesktop.machine1.host-open-pty" : "org.freedesktop.machine1.open-pty", NULL, false, UID_INVALID, &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); if (master < 0) return master; r = ptsname_namespace(master, &pty_name); 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); } 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_unrefp) sd_bus *bus = NULL; char *address; r = sd_bus_new(&bus); if (r < 0) return r; if (asprintf(&address, "x-machine-kernel:pid=%1$" PID_PRI ";x-machine-unix:pid=%1$" PID_PRI, m->leader) < 0) return -ENOMEM; bus->address = address; bus->bus_client = true; bus->trusted = false; bus->is_system = true; 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 = -1; sd_bus *container_bus = NULL; Machine *m = userdata; const char *p, *getty; int r; assert(message); assert(m); r = bus_verify_polkit_async( message, CAP_SYS_ADMIN, m->class == MACHINE_HOST ? "org.freedesktop.machine1.host-login" : "org.freedesktop.machine1.login", NULL, false, UID_INVALID, &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); if (master < 0) return master; r = ptsname_namespace(master, &pty_name); if (r < 0) return r; p = path_startswith(pty_name, "/dev/pts/"); if (!p) return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "PTS name %s is invalid", pty_name); 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 = sd_bus_call_method( container_bus, "org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "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 = -1, slave = -1; _cleanup_strv_free_ char **env = NULL, **args_wire = NULL, **args = NULL; Machine *m = userdata; const char *p, *unit, *user, *path, *description, *utmp_id; int r; assert(message); assert(m); r = sd_bus_message_read(message, "ss", &user, &path); if (r < 0) return r; user = empty_to_null(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 */ isempty(user) ? "root" : 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, NULL); 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_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid environment assignments"); r = bus_verify_polkit_async( message, CAP_SYS_ADMIN, m->class == MACHINE_HOST ? "org.freedesktop.machine1.host-shell" : "org.freedesktop.machine1.shell", NULL, false, UID_INVALID, &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); if (master < 0) return master; r = ptsname_namespace(master, &pty_name); if (r < 0) return r; p = path_startswith(pty_name, "/dev/pts/"); assert(p); 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 = sd_bus_message_new_method_call( container_bus, &tm, "org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartTransientUnit"); if (r < 0) return r; /* Name and mode */ 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 ", isempty(user) ? "root" : user); r = sd_bus_message_append(tm, "(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", "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", isempty(user) ? "root" : 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) { _cleanup_close_pair_ int errno_pipe_fd[2] = { -1, -1 }; char mount_slave[] = "/tmp/propagate.XXXXXX", *mount_tmp, *mount_outside, *p; bool mount_slave_created = false, mount_slave_mounted = false, mount_tmp_created = false, mount_tmp_mounted = false, mount_outside_created = false, mount_outside_mounted = false; _cleanup_free_ char *chased_src = NULL; int read_only, make_file_or_directory; const char *dest, *src; Machine *m = userdata; struct stat st; pid_t child; uid_t uid; int r; assert(message); assert(m); if (m->class != MACHINE_CONTAINER) return sd_bus_error_setf(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_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Source path must be absolute and not contain ../."); if (isempty(dest)) dest = src; else if (!path_is_absolute(dest) || !path_is_normalized(dest)) return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Destination path must be absolute and not contain ../."); r = bus_verify_polkit_async( message, CAP_SYS_ADMIN, "org.freedesktop.machine1.manage-machines", NULL, false, UID_INVALID, &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_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Can't bind mount on container with user namespacing applied."); /* One day, when bind mounting /proc/self/fd/n works across * namespace boundaries we should rework this logic to make * use of it... */ p = strjoina("/run/systemd/nspawn/propagate/", m->name, "/"); if (laccess(p, F_OK) < 0) return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Container does not allow propagation of mount points."); r = chase_symlinks(src, NULL, CHASE_TRAIL_SLASH, &chased_src); if (r < 0) return sd_bus_error_set_errnof(error, r, "Failed to resolve source path: %m"); if (lstat(chased_src, &st) < 0) return sd_bus_error_set_errnof(error, errno, "Failed to stat() source path: %m"); if (S_ISLNK(st.st_mode)) /* This shouldn't really happen, given that we just chased the symlinks above, but let's better be safe… */ return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Source directory can't be a symbolic link"); /* Our goal is to install a new bind mount into the container, possibly read-only. This is irritatingly complex unfortunately, currently. First, we start by creating a private playground in /tmp, that we can mount MS_SLAVE. (Which is necessary, since MS_MOVE cannot be applied to mounts with MS_SHARED parent mounts.) */ if (!mkdtemp(mount_slave)) return sd_bus_error_set_errnof(error, errno, "Failed to create playground %s: %m", mount_slave); mount_slave_created = true; if (mount(mount_slave, mount_slave, NULL, MS_BIND, NULL) < 0) { r = sd_bus_error_set_errnof(error, errno, "Failed to make bind mount %s: %m", mount_slave); goto finish; } mount_slave_mounted = true; if (mount(NULL, mount_slave, NULL, MS_SLAVE, NULL) < 0) { r = sd_bus_error_set_errnof(error, errno, "Failed to remount slave %s: %m", mount_slave); goto finish; } /* Second, we mount the source file or directory to a directory inside of our MS_SLAVE playground. */ mount_tmp = strjoina(mount_slave, "/mount"); if (S_ISDIR(st.st_mode)) r = mkdir_errno_wrapper(mount_tmp, 0700); else r = touch(mount_tmp); if (r < 0) { sd_bus_error_set_errnof(error, errno, "Failed to create temporary mount point %s: %m", mount_tmp); goto finish; } mount_tmp_created = true; if (mount(chased_src, mount_tmp, NULL, MS_BIND, NULL) < 0) { r = sd_bus_error_set_errnof(error, errno, "Failed to mount %s: %m", chased_src); goto finish; } mount_tmp_mounted = true; /* Third, we remount the new bind mount read-only if requested. */ if (read_only) if (mount(NULL, mount_tmp, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY, NULL) < 0) { r = sd_bus_error_set_errnof(error, errno, "Failed to remount read-only %s: %m", mount_tmp); goto finish; } /* Fourth, we move the new bind mount into the propagation directory. This way it will appear there read-only * right-away. */ mount_outside = strjoina("/run/systemd/nspawn/propagate/", m->name, "/XXXXXX"); if (S_ISDIR(st.st_mode)) r = mkdtemp(mount_outside) ? 0 : -errno; else { r = mkostemp_safe(mount_outside); safe_close(r); } if (r < 0) { sd_bus_error_set_errnof(error, errno, "Cannot create propagation file or directory %s: %m", mount_outside); goto finish; } mount_outside_created = true; if (mount(mount_tmp, mount_outside, NULL, MS_MOVE, NULL) < 0) { r = sd_bus_error_set_errnof(error, errno, "Failed to move %s to %s: %m", mount_tmp, mount_outside); goto finish; } mount_outside_mounted = true; mount_tmp_mounted = false; if (S_ISDIR(st.st_mode)) (void) rmdir(mount_tmp); else (void) unlink(mount_tmp); mount_tmp_created = false; (void) umount(mount_slave); mount_slave_mounted = false; (void) rmdir(mount_slave); mount_slave_created = false; if (pipe2(errno_pipe_fd, O_CLOEXEC|O_NONBLOCK) < 0) { r = sd_bus_error_set_errnof(error, errno, "Failed to create pipe: %m"); goto finish; } r = safe_fork("(sd-bindmnt)", FORK_RESET_SIGNALS, &child); if (r < 0) { sd_bus_error_set_errnof(error, r, "Failed to fork(): %m"); goto finish; } if (r == 0) { const char *mount_inside; int mntfd; const char *q; errno_pipe_fd[0] = safe_close(errno_pipe_fd[0]); q = procfs_file_alloca(m->leader, "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; } if (make_file_or_directory) { if (S_ISDIR(st.st_mode)) (void) mkdir_p(dest, 0755); else { (void) mkdir_parents(dest, 0755); safe_close(open(dest, O_CREAT|O_EXCL|O_WRONLY|O_CLOEXEC|O_NOCTTY, 0600)); } } /* Fifth, move the mount to the right place inside */ mount_inside = strjoina("/run/systemd/nspawn/incoming/", basename(mount_outside)); if (mount(mount_inside, dest, NULL, MS_MOVE, NULL) < 0) { r = log_error_errno(errno, "Failed to mount: %m"); goto child_fail; } _exit(EXIT_SUCCESS); child_fail: (void) write(errno_pipe_fd[1], &r, sizeof(r)); errno_pipe_fd[1] = safe_close(errno_pipe_fd[1]); _exit(EXIT_FAILURE); } errno_pipe_fd[1] = safe_close(errno_pipe_fd[1]); r = wait_for_terminate_and_check("(sd-bindmnt)", child, 0); if (r < 0) { r = sd_bus_error_set_errnof(error, r, "Failed to wait for child: %m"); goto finish; } if (r != EXIT_SUCCESS) { if (read(errno_pipe_fd[0], &r, sizeof(r)) == sizeof(r)) r = sd_bus_error_set_errnof(error, r, "Failed to mount: %m"); else r = sd_bus_error_setf(error, SD_BUS_ERROR_FAILED, "Child failed."); goto finish; } r = sd_bus_reply_method_return(message, NULL); finish: if (mount_outside_mounted) (void) umount(mount_outside); if (mount_outside_created) { if (S_ISDIR(st.st_mode)) (void) rmdir(mount_outside); else (void) unlink(mount_outside); } if (mount_tmp_mounted) (void) umount(mount_tmp); if (mount_tmp_created) { if (S_ISDIR(st.st_mode)) (void) rmdir(mount_tmp); else (void) unlink(mount_tmp); } if (mount_slave_mounted) (void) umount(mount_slave); if (mount_slave_created) (void) rmdir(mount_slave); return r; } int bus_machine_method_copy(sd_bus_message *message, void *userdata, sd_bus_error *error) { const char *src, *dest, *host_path, *container_path, *host_basename, *host_dirname, *container_basename, *container_dirname; _cleanup_close_pair_ int errno_pipe_fd[2] = { -1, -1 }; CopyFlags copy_flags = COPY_REFLINK|COPY_MERGE; _cleanup_close_ int hostfd = -1; Machine *m = userdata; bool copy_from; pid_t child; uid_t uid_shift; char *t; int r; assert(message); assert(m); if (m->manager->n_operations >= OPERATIONS_MAX) return sd_bus_error_setf(error, SD_BUS_ERROR_LIMITS_EXCEEDED, "Too many ongoing copies."); if (m->class != MACHINE_CONTAINER) return sd_bus_error_setf(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 (!path_is_absolute(src)) return sd_bus_error_setf(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_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Destination path must be absolute."); r = bus_verify_polkit_async( message, CAP_SYS_ADMIN, "org.freedesktop.machine1.manage-machines", NULL, false, UID_INVALID, &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; } host_basename = basename(host_path); t = strdupa(host_path); host_dirname = dirname(t); container_basename = basename(container_path); t = strdupa(container_path); container_dirname = dirname(t); hostfd = open(host_dirname, O_CLOEXEC|O_RDONLY|O_NOCTTY|O_DIRECTORY); if (hostfd < 0) return sd_bus_error_set_errnof(error, errno, "Failed to open host directory %s: %m", host_dirname); 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, "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(container_dirname, O_CLOEXEC|O_RDONLY|O_NOCTTY|O_DIRECTORY); if (containerfd < 0) { r = log_error_errno(errno, "Failed to open destination directory: %m"); goto child_fail; } /* Run the actual copy operation. Note that when an 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); 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); 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(m->manager, m, child, message, errno_pipe_fd[0], NULL); if (r < 0) { (void) sigkill_wait(child); return r; } errno_pipe_fd[0] = -1; return 1; } int bus_machine_method_open_root_directory(sd_bus_message *message, void *userdata, sd_bus_error *error) { _cleanup_close_ int fd = -1; Machine *m = userdata; int r; assert(message); assert(m); r = bus_verify_polkit_async( message, CAP_SYS_ADMIN, "org.freedesktop.machine1.manage-machines", NULL, false, UID_INVALID, &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 = -1, root_fd = -1; _cleanup_close_pair_ int pair[2] = { -1, -1 }; pid_t child; r = namespace_open(m->leader, NULL, &mntns_fd, NULL, NULL, &root_fd); if (r < 0) return r; if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) return -errno; r = safe_fork("(sd-openroot)", FORK_RESET_SIGNALS|FORK_DEATHSIG, &child); if (r < 0) return sd_bus_error_set_errnof(error, r, "Failed to fork(): %m"); if (r == 0) { _cleanup_close_ int dfd = -1; pair[0] = safe_close(pair[0]); r = namespace_enter(-1, mntns_fd, -1, -1, root_fd); if (r < 0) _exit(EXIT_FAILURE); 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-openroot)", 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_setf(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_setf(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 = userdata; uid_t shift = 0; int r; assert(message); assert(m); /* 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_setf(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); } 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), 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("State", "s", property_get_state, 0, 0), SD_BUS_METHOD("Terminate", NULL, NULL, bus_machine_method_terminate, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("Kill", "si", NULL, bus_machine_method_kill, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("GetAddresses", NULL, "a(iay)", bus_machine_method_get_addresses, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("GetOSRelease", NULL, "a{ss}", bus_machine_method_get_os_release, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("GetUIDShift", NULL, "u", bus_machine_method_get_uid_shift, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("OpenPTY", NULL, "hs", bus_machine_method_open_pty, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("OpenLogin", NULL, "hs", bus_machine_method_open_login, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("OpenShell", "ssasas", "hs", bus_machine_method_open_shell, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("BindMount", "ssbb", NULL, bus_machine_method_bind_mount, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("CopyFrom", "ss", NULL, bus_machine_method_copy, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("CopyTo", "ss", NULL, bus_machine_method_copy, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("OpenRootDirectory", NULL, "h", bus_machine_method_open_root_directory, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_VTABLE_END }; int machine_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) { Manager *m = userdata; Machine *machine; int r; assert(bus); assert(path); assert(interface); assert(found); assert(m); if (streq(path, "/org/freedesktop/machine1/machine/self")) { _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL; sd_bus_message *message; pid_t pid; message = sd_bus_get_current_message(bus); if (!message) return 0; r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_PID, &creds); if (r < 0) return r; r = sd_bus_creds_get_pid(creds, &pid); if (r < 0) return r; r = manager_get_machine_by_pid(m, pid, &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 strappend("/org/freedesktop/machine1/machine/", e); } 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; Iterator i; int r; assert(bus); assert(path); assert(nodes); HASHMAP_FOREACH(machine, m->machines, i) { 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; } 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); }