diff options
Diffstat (limited to 'src/machine/machine-dbus.c')
| -rw-r--r-- | src/machine/machine-dbus.c | 1391 |
1 files changed, 1391 insertions, 0 deletions
diff --git a/src/machine/machine-dbus.c b/src/machine/machine-dbus.c new file mode 100644 index 0000000..0a24524 --- /dev/null +++ b/src/machine/machine-dbus.c @@ -0,0 +1,1391 @@ +/* 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 "io-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, + CAP_KILL, + "org.freedesktop.machine1.manage-machines", + details, + false, + UID_INVALID, + &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, + CAP_KILL, + "org.freedesktop.machine1.manage-machines", + details, + 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 = ASSERT_PTR(userdata); + const char *swho; + int32_t signo; + KillWho who; + int r; + + assert(message); + + 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); + + const char *details[] = { + "machine", m->name, + "verb", "kill", + NULL + }; + + r = bus_verify_polkit_async( + message, + CAP_KILL, + "org.freedesktop.machine1.manage-machines", + details, + 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 = 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; + + switch (m->class) { + + case MACHINE_HOST: { + _cleanup_free_ struct local_address *addresses = NULL; + int n; + + n = local_addresses(NULL, 0, AF_UNSPEC, &addresses); + if (n < 0) + return n; + + 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; + } + + 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 = namespace_fork("(sd-addrns)", "(sd-addr)", NULL, 0, FORK_RESET_SIGNALS|FORK_DEATHSIG, + -1, -1, netns_fd, -1, -1, &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]); + + 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] = IOVEC_MAKE(&family, sizeof(family)); + iov[1] = IOVEC_MAKE(&in_addr, 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-addrns)", 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."); + break; + } + + default: + return sd_bus_error_set(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 = ASSERT_PTR(userdata); + int r; + + assert(message); + + 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, pidns_fd = -1; + _cleanup_close_pair_ int pair[2] = { -1, -1 }; + _cleanup_fclose_ FILE *f = NULL; + pid_t child; + + r = namespace_open(m->leader, &pidns_fd, &mntns_fd, NULL, NULL, &root_fd); + if (r < 0) + return r; + + if (socketpair(AF_UNIX, SOCK_SEQPACKET, 0, pair) < 0) + return -errno; + + r = namespace_fork("(sd-osrelns)", "(sd-osrel)", NULL, 0, FORK_RESET_SIGNALS|FORK_DEATHSIG, + pidns_fd, 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) { + int fd = -1; + + pair[0] = safe_close(pair[0]); + + 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_MAX, 0); + if (r < 0) + _exit(EXIT_FAILURE); + + _exit(EXIT_SUCCESS); + } + + pair[1] = safe_close(pair[1]); + + f = take_fdopen(&pair[0], "r"); + if (!f) + return -errno; + + r = load_env_file_pairs(f, "/etc/os-release", &l); + if (r < 0) + return r; + + r = wait_for_terminate_and_check("(sd-osrelns)", 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_set(error, SD_BUS_ERROR_FAILED, "Machine does not contain OS release information"); + if (r != EXIT_SUCCESS) + return sd_bus_error_set(error, SD_BUS_ERROR_FAILED, "Child died abnormally."); + + break; + } + + default: + return sd_bus_error_set(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 = ASSERT_PTR(userdata); + int r; + + assert(message); + + const char *details[] = { + "machine", m->name, + NULL + }; + + r = bus_verify_polkit_async( + message, + CAP_SYS_ADMIN, + m->class == MACHINE_HOST ? "org.freedesktop.machine1.host-open-pty" : "org.freedesktop.machine1.open-pty", + details, + 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, &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) < 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 = 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, + CAP_SYS_ADMIN, + m->class == MACHINE_HOST ? "org.freedesktop.machine1.host-login" : "org.freedesktop.machine1.login", + details, + 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, &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 = -1, slave = -1; + _cleanup_strv_free_ char **env = NULL, **args_wire = NULL, **args = NULL; + Machine *m = ASSERT_PTR(userdata); + const char *p, *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"); + + const char *details[] = { + "machine", m->name, + "user", user, + "program", path, + NULL + }; + + r = bus_verify_polkit_async( + message, + CAP_SYS_ADMIN, + m->class == MACHINE_HOST ? "org.freedesktop.machine1.host-shell" : "org.freedesktop.machine1.shell", + details, + 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, &pty_name); + if (master < 0) + return master; + + 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 = bus_message_new_method_call(container_bus, &tm, bus_systemd_mgr, "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 ", 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); + 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, + CAP_SYS_ADMIN, + "org.freedesktop.machine1.manage-machines", + details, + 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_set(error, SD_BUS_ERROR_NOT_SUPPORTED, "Can't bind mount on container with user namespacing applied."); + + propagate_directory = strjoina("/run/systemd/nspawn/propagate/", m->name); + r = bind_mount_in_namespace(m->leader, + propagate_directory, + "/run/host/incoming/", + src, dest, read_only, make_file_or_directory); + 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] = { -1, -1 }; + CopyFlags copy_flags = COPY_REFLINK|COPY_MERGE|COPY_HARDLINKS; + _cleanup_close_ int hostfd = -1; + 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, + CAP_SYS_ADMIN, + "org.freedesktop.machine1.manage-machines", + details, + 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; + } + + 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, "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 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 = ASSERT_PTR(userdata); + int r; + + assert(message); + + const char *details[] = { + "machine", m->name, + "verb", "open_root_directory", + NULL + }; + + r = bus_verify_polkit_async( + message, + CAP_SYS_ADMIN, + "org.freedesktop.machine1.manage-machines", + details, + 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 = namespace_fork("(sd-openrootns)", "(sd-openroot)", NULL, 0, FORK_RESET_SIGNALS|FORK_DEATHSIG, + -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 = -1; + + 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_(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 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), 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_WITH_ARGS("Kill", + SD_BUS_ARGS("s", who, "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("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); +} |