+/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
#include "env-util.h"
#include "fd-util.h"
#include "fileio.h"
-#include "formats-util.h"
+#include "format-util.h"
#include "fs-util.h"
#include "in-addr-util.h"
#include "local-addresses.h"
#include "terminal-util.h"
#include "user-util.h"
-static int property_get_id(
- 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);
-
- return sd_bus_message_append_array(reply, 'y', &m->id, 16);
-}
-
static int property_get_state(
sd_bus *bus,
const char *path,
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_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
_cleanup_strv_free_ char **l = NULL;
Machine *m = userdata;
- char **k, **v;
int r;
assert(message);
return sd_bus_error_set_errnof(error, errno, "Failed to fork(): %m");
if (child == 0) {
- _cleanup_close_ int fd = -1;
+ int fd = -1;
pair[0] = safe_close(pair[0]);
if (r < 0)
_exit(EXIT_FAILURE);
- fd = open("/etc/os-release", O_RDONLY|O_CLOEXEC);
- if (fd < 0) {
- fd = open("/usr/lib/os-release", O_RDONLY|O_CLOEXEC);
- if (fd < 0)
- _exit(EXIT_FAILURE);
+ fd = open("/etc/os-release", O_RDONLY|O_CLOEXEC|O_NOCTTY);
+ if (fd < 0 && errno == ENOENT) {
+ fd = open("/usr/lib/os-release", O_RDONLY|O_CLOEXEC|O_NOCTTY);
+ if (fd < 0 && errno == ENOENT)
+ _exit(EXIT_NOT_FOUND);
}
+ if (fd < 0)
+ _exit(EXIT_FAILURE);
- r = copy_bytes(fd, pair[1], (uint64_t) -1, false);
+ r = copy_bytes(fd, pair[1], (uint64_t) -1, 0);
if (r < 0)
_exit(EXIT_FAILURE);
r = wait_for_terminate(child, &si);
if (r < 0)
return sd_bus_error_set_errnof(error, r, "Failed to wait for child: %m");
+ if (si.si_code == CLD_EXITED && si.si_status == EXIT_NOT_FOUND)
+ return sd_bus_error_setf(error, SD_BUS_ERROR_FAILED, "Machine does not contain OS release information");
if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS)
return sd_bus_error_setf(error, SD_BUS_ERROR_FAILED, "Child died abnormally.");
return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Requesting OS release data is only supported on container machines.");
}
- r = sd_bus_message_new_method_return(message, &reply);
- if (r < 0)
- return r;
-
- r = sd_bus_message_open_container(reply, 'a', "{ss}");
- if (r < 0)
- return r;
-
- STRV_FOREACH_PAIR(k, v, l) {
- r = sd_bus_message_append(reply, "{ss}", *k, *v);
- if (r < 0)
- return r;
- }
-
- r = sd_bus_message_close_container(reply);
- if (r < 0)
- return r;
-
- return sd_bus_send(NULL, reply, NULL);
+ return bus_reply_pair_array(message, l);
}
int bus_machine_method_open_pty(sd_bus_message *message, void *userdata, sd_bus_error *error) {
r = sd_bus_message_read(message, "ss", &user, &path);
if (r < 0)
return r;
- if (isempty(user))
- user = NULL;
+ user = empty_to_null(user);
if (isempty(path))
path = "/bin/sh";
if (!path_is_absolute(path))
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;
- int read_only, make_directory;
- pid_t child;
+ struct stat st;
siginfo_t si;
+ pid_t child;
+ uid_t uid;
int r;
assert(message);
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_directory);
+ r = sd_bus_message_read(message, "ssbb", &src, &dest, &read_only, &make_file_or_directory);
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... */
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, 0, &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.
goto finish;
}
- /* Second, we mount the source directory to a directory inside
- of our MS_SLAVE playground. */
+ /* Second, we mount the source file or directory to a directory inside of our MS_SLAVE playground. */
mount_tmp = strjoina(mount_slave, "/mount");
- if (mkdir(mount_tmp, 0700) < 0) {
- r = sd_bus_error_set_errnof(error, errno, "Failed to create temporary mount point %s: %m", mount_tmp);
+ if (S_ISDIR(st.st_mode))
+ r = mkdir(mount_tmp, 0700) < 0 ? -errno : 0;
+ 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(src, mount_tmp, NULL, MS_BIND, NULL) < 0) {
- r = sd_bus_error_set_errnof(error, errno, "Failed to overmount %s: %m", mount_tmp);
+ 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;
}
goto finish;
}
- /* Fourth, we move the new bind mount into the propagation
- * directory. This way it will appear there read-only
+ /* 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 (!mkdtemp(mount_outside)) {
- r = sd_bus_error_set_errnof(error, errno, "Cannot create propagation directory %s: %m", mount_outside);
+ 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_mounted = true;
mount_tmp_mounted = false;
- (void) rmdir(mount_tmp);
+ if (S_ISDIR(st.st_mode))
+ (void) rmdir(mount_tmp);
+ else
+ (void) unlink(mount_tmp);
mount_tmp_created = false;
(void) umount(mount_slave);
goto child_fail;
}
- if (make_directory)
- (void) mkdir_p(dest, 0755);
+ 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));
finish:
if (mount_outside_mounted)
- umount(mount_outside);
- if (mount_outside_created)
- rmdir(mount_outside);
+ (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)
- umount(mount_tmp);
- if (mount_tmp_created)
- rmdir(mount_tmp);
+ (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)
- umount(mount_slave);
+ (void) umount(mount_slave);
if (mount_slave_created)
- rmdir(mount_slave);
+ (void) rmdir(mount_slave);
return r;
}
-static int machine_operation_done(sd_event_source *s, const siginfo_t *si, void *userdata) {
- _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
- MachineOperation *o = userdata;
- int r;
-
- assert(o);
- assert(si);
-
- o->pid = 0;
-
- if (si->si_code != CLD_EXITED) {
- r = sd_bus_error_setf(&error, SD_BUS_ERROR_FAILED, "Child died abnormally.");
- goto fail;
- }
-
- if (si->si_status != EXIT_SUCCESS) {
- if (read(o->errno_fd, &r, sizeof(r)) == sizeof(r))
- r = sd_bus_error_set_errnof(&error, r, "%m");
- else
- r = sd_bus_error_setf(&error, SD_BUS_ERROR_FAILED, "Child failed.");
-
- goto fail;
- }
-
- r = sd_bus_reply_method_return(o->message, NULL);
- if (r < 0)
- log_error_errno(r, "Failed to reply to message: %m");
-
- machine_operation_unref(o);
- return 0;
-
-fail:
- r = sd_bus_reply_method_error(o->message, &error);
- if (r < 0)
- log_error_errno(r, "Failed to reply to message: %m");
-
- machine_operation_unref(o);
- return 0;
-}
-
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;
- MachineOperation *o;
bool copy_from;
pid_t child;
+ uid_t uid_shift;
char *t;
int r;
assert(message);
assert(m);
- if (m->n_operations >= MACHINE_OPERATIONS_MAX)
+ 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)
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) {
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, true);
+ 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, true);
+ 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);
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]);
- /* Copying might take a while, hence install a watch the
- * child, and return */
-
- o = new0(MachineOperation, 1);
- if (!o)
- return log_oom();
+ /* Copying might take a while, hence install a watch on the child, and return */
- o->pid = child;
- o->message = sd_bus_message_ref(message);
- o->errno_fd = errno_pipe_fd[0];
+ 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;
- r = sd_event_add_child(m->manager->event, &o->event_source, child, WEXITED, machine_operation_done, o);
- if (r < 0) {
- machine_operation_unref(o);
- return log_oom();
+ 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 };
+ siginfo_t si;
+ 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;
+
+ child = fork();
+ if (child < 0)
+ return sd_bus_error_set_errnof(error, errno, "Failed to fork(): %m");
+
+ if (child == 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(child, &si);
+ if (r < 0)
+ return sd_bus_error_set_errnof(error, r, "Failed to wait for child: %m");
+ if (si.si_code != CLD_EXITED || si.si_status != 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;
}
- LIST_PREPEND(operations, m->operations, o);
- m->n_operations++;
- o->machine = m;
+ default:
+ return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Opening the root directory is only supported on container machines.");
+ }
- return 1;
+ 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", property_get_id, 0, 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_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
};
projects / thirdparty / systemd.git / blobdiff