/* SPDX-License-Identifier: LGPL-2.1+ */
#include <sys/file.h>
#include <sys/mount.h>
#include "alloc-util.h"
#include "bus-label.h"
#include "bus-util.h"
#include "copy.h"
#include "dissect-image.h"
#include "fd-util.h"
#include "fileio.h"
#include "fs-util.h"
#include "image-dbus.h"
#include "io-util.h"
#include "loop-util.h"
#include "machine-image.h"
#include "mount-util.h"
#include "process-util.h"
#include "raw-clone.h"
#include "strv.h"
#include "user-util.h"
static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_type, image_type, ImageType);
int bus_image_method_remove(
sd_bus_message *message,
void *userdata,
sd_bus_error *error) {
_cleanup_close_pair_ int errno_pipe_fd[2] = { -1, -1 };
Image *image = userdata;
Manager *m = image->userdata;
pid_t child;
int r;
assert(message);
assert(image);
if (m->n_operations >= OPERATIONS_MAX)
return sd_bus_error_setf(error, SD_BUS_ERROR_LIMITS_EXCEEDED, "Too many ongoing operations.");
r = bus_verify_polkit_async(
message,
CAP_SYS_ADMIN,
"org.freedesktop.machine1.manage-images",
NULL,
false,
UID_INVALID,
&m->polkit_registry,
error);
if (r < 0)
return r;
if (r == 0)
return 1; /* Will call us back */
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-imgrm)", FORK_RESET_SIGNALS, &child);
if (r < 0)
return sd_bus_error_set_errnof(error, r, "Failed to fork(): %m");
if (r == 0) {
errno_pipe_fd[0] = safe_close(errno_pipe_fd[0]);
r = image_remove(image);
if (r < 0) {
(void) write(errno_pipe_fd[1], &r, sizeof(r));
_exit(EXIT_FAILURE);
}
_exit(EXIT_SUCCESS);
}
errno_pipe_fd[1] = safe_close(errno_pipe_fd[1]);
r = operation_new(m, NULL, 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_image_method_rename(
sd_bus_message *message,
void *userdata,
sd_bus_error *error) {
Image *image = userdata;
Manager *m = image->userdata;
const char *new_name;
int r;
assert(message);
assert(image);
r = sd_bus_message_read(message, "s", &new_name);
if (r < 0)
return r;
if (!image_name_is_valid(new_name))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Image name '%s' is invalid.", new_name);
r = bus_verify_polkit_async(
message,
CAP_SYS_ADMIN,
"org.freedesktop.machine1.manage-images",
NULL,
false,
UID_INVALID,
&m->polkit_registry,
error);
if (r < 0)
return r;
if (r == 0)
return 1; /* Will call us back */
r = image_rename(image, new_name);
if (r < 0)
return r;
return sd_bus_reply_method_return(message, NULL);
}
int bus_image_method_clone(
sd_bus_message *message,
void *userdata,
sd_bus_error *error) {
_cleanup_close_pair_ int errno_pipe_fd[2] = { -1, -1 };
Image *image = userdata;
Manager *m = image->userdata;
const char *new_name;
int r, read_only;
pid_t child;
assert(message);
assert(image);
assert(m);
if (m->n_operations >= OPERATIONS_MAX)
return sd_bus_error_setf(error, SD_BUS_ERROR_LIMITS_EXCEEDED, "Too many ongoing operations.");
r = sd_bus_message_read(message, "sb", &new_name, &read_only);
if (r < 0)
return r;
if (!image_name_is_valid(new_name))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Image name '%s' is invalid.", new_name);
r = bus_verify_polkit_async(
message,
CAP_SYS_ADMIN,
"org.freedesktop.machine1.manage-images",
NULL,
false,
UID_INVALID,
&m->polkit_registry,
error);
if (r < 0)
return r;
if (r == 0)
return 1; /* Will call us back */
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("(imgclone)", FORK_RESET_SIGNALS, &child);
if (r < 0)
return sd_bus_error_set_errnof(error, r, "Failed to fork(): %m");
if (r == 0) {
errno_pipe_fd[0] = safe_close(errno_pipe_fd[0]);
r = image_clone(image, new_name, read_only);
if (r < 0) {
(void) write(errno_pipe_fd[1], &r, sizeof(r));
_exit(EXIT_FAILURE);
}
_exit(EXIT_SUCCESS);
}
errno_pipe_fd[1] = safe_close(errno_pipe_fd[1]);
r = operation_new(m, NULL, 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_image_method_mark_read_only(
sd_bus_message *message,
void *userdata,
sd_bus_error *error) {
Image *image = userdata;
Manager *m = image->userdata;
int r, read_only;
assert(message);
r = sd_bus_message_read(message, "b", &read_only);
if (r < 0)
return r;
r = bus_verify_polkit_async(
message,
CAP_SYS_ADMIN,
"org.freedesktop.machine1.manage-images",
NULL,
false,
UID_INVALID,
&m->polkit_registry,
error);
if (r < 0)
return r;
if (r == 0)
return 1; /* Will call us back */
r = image_read_only(image, read_only);
if (r < 0)
return r;
return sd_bus_reply_method_return(message, NULL);
}
int bus_image_method_set_limit(
sd_bus_message *message,
void *userdata,
sd_bus_error *error) {
Image *image = userdata;
Manager *m = image->userdata;
uint64_t limit;
int r;
assert(message);
r = sd_bus_message_read(message, "t", &limit);
if (r < 0)
return r;
if (!FILE_SIZE_VALID_OR_INFINITY(limit))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "New limit out of range");
r = bus_verify_polkit_async(
message,
CAP_SYS_ADMIN,
"org.freedesktop.machine1.manage-images",
NULL,
false,
UID_INVALID,
&m->polkit_registry,
error);
if (r < 0)
return r;
if (r == 0)
return 1; /* Will call us back */
r = image_set_limit(image, limit);
if (r < 0)
return r;
return sd_bus_reply_method_return(message, NULL);
}
int bus_image_method_get_hostname(
sd_bus_message *message,
void *userdata,
sd_bus_error *error) {
Image *image = userdata;
int r;
if (!image->metadata_valid) {
r = image_read_metadata(image);
if (r < 0)
return sd_bus_error_set_errnof(error, r, "Failed to read image metadata: %m");
}
return sd_bus_reply_method_return(message, "s", image->hostname);
}
int bus_image_method_get_machine_id(
sd_bus_message *message,
void *userdata,
sd_bus_error *error) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
Image *image = userdata;
int r;
if (!image->metadata_valid) {
r = image_read_metadata(image);
if (r < 0)
return sd_bus_error_set_errnof(error, r, "Failed to read image metadata: %m");
}
r = sd_bus_message_new_method_return(message, &reply);
if (r < 0)
return r;
if (sd_id128_is_null(image->machine_id)) /* Add an empty array if the ID is zero */
r = sd_bus_message_append(reply, "ay", 0);
else
r = sd_bus_message_append_array(reply, 'y', image->machine_id.bytes, 16);
if (r < 0)
return r;
return sd_bus_send(NULL, reply, NULL);
}
int bus_image_method_get_machine_info(
sd_bus_message *message,
void *userdata,
sd_bus_error *error) {
Image *image = userdata;
int r;
if (!image->metadata_valid) {
r = image_read_metadata(image);
if (r < 0)
return sd_bus_error_set_errnof(error, r, "Failed to read image metadata: %m");
}
return bus_reply_pair_array(message, image->machine_info);
}
int bus_image_method_get_os_release(
sd_bus_message *message,
void *userdata,
sd_bus_error *error) {
Image *image = userdata;
int r;
if (!image->metadata_valid) {
r = image_read_metadata(image);
if (r < 0)
return sd_bus_error_set_errnof(error, r, "Failed to read image metadata: %m");
}
return bus_reply_pair_array(message, image->os_release);
}
const sd_bus_vtable image_vtable[] = {
SD_BUS_VTABLE_START(0),
SD_BUS_PROPERTY("Name", "s", NULL, offsetof(Image, name), 0),
SD_BUS_PROPERTY("Path", "s", NULL, offsetof(Image, path), 0),
SD_BUS_PROPERTY("Type", "s", property_get_type, offsetof(Image, type), 0),
SD_BUS_PROPERTY("ReadOnly", "b", bus_property_get_bool, offsetof(Image, read_only), 0),
SD_BUS_PROPERTY("CreationTimestamp", "t", NULL, offsetof(Image, crtime), 0),
SD_BUS_PROPERTY("ModificationTimestamp", "t", NULL, offsetof(Image, mtime), 0),
SD_BUS_PROPERTY("Usage", "t", NULL, offsetof(Image, usage), 0),
SD_BUS_PROPERTY("Limit", "t", NULL, offsetof(Image, limit), 0),
SD_BUS_PROPERTY("UsageExclusive", "t", NULL, offsetof(Image, usage_exclusive), 0),
SD_BUS_PROPERTY("LimitExclusive", "t", NULL, offsetof(Image, limit_exclusive), 0),
SD_BUS_METHOD("Remove", NULL, NULL, bus_image_method_remove, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("Rename", "s", NULL, bus_image_method_rename, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("Clone", "sb", NULL, bus_image_method_clone, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("MarkReadOnly", "b", NULL, bus_image_method_mark_read_only, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("SetLimit", "t", NULL, bus_image_method_set_limit, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("GetHostname", NULL, "s", bus_image_method_get_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("GetMachineID", NULL, "ay", bus_image_method_get_machine_id, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("GetMachineInfo", NULL, "a{ss}", bus_image_method_get_machine_info, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("GetOSRelease", NULL, "a{ss}", bus_image_method_get_os_release, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_VTABLE_END
};
static int image_flush_cache(sd_event_source *s, void *userdata) {
Manager *m = userdata;
assert(s);
assert(m);
hashmap_clear_with_destructor(m->image_cache, image_unref);
return 0;
}
int image_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
_cleanup_free_ char *e = NULL;
Manager *m = userdata;
Image *image = NULL;
const char *p;
int r;
assert(bus);
assert(path);
assert(interface);
assert(found);
p = startswith(path, "/org/freedesktop/machine1/image/");
if (!p)
return 0;
e = bus_label_unescape(p);
if (!e)
return -ENOMEM;
image = hashmap_get(m->image_cache, e);
if (image) {
*found = image;
return 1;
}
r = hashmap_ensure_allocated(&m->image_cache, &string_hash_ops);
if (r < 0)
return r;
if (!m->image_cache_defer_event) {
r = sd_event_add_defer(m->event, &m->image_cache_defer_event, image_flush_cache, m);
if (r < 0)
return r;
r = sd_event_source_set_priority(m->image_cache_defer_event, SD_EVENT_PRIORITY_IDLE);
if (r < 0)
return r;
}
r = sd_event_source_set_enabled(m->image_cache_defer_event, SD_EVENT_ONESHOT);
if (r < 0)
return r;
r = image_find(IMAGE_MACHINE, e, &image);
if (r == -ENOENT)
return 0;
if (r < 0)
return r;
image->userdata = m;
r = hashmap_put(m->image_cache, image->name, image);
if (r < 0) {
image_unref(image);
return r;
}
*found = image;
return 1;
}
char *image_bus_path(const char *name) {
_cleanup_free_ char *e = NULL;
assert(name);
e = bus_label_escape(name);
if (!e)
return NULL;
return strappend("/org/freedesktop/machine1/image/", e);
}
int image_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
_cleanup_(image_hashmap_freep) Hashmap *images = NULL;
_cleanup_strv_free_ char **l = NULL;
Image *image;
Iterator i;
int r;
assert(bus);
assert(path);
assert(nodes);
images = hashmap_new(&string_hash_ops);
if (!images)
return -ENOMEM;
r = image_discover(IMAGE_MACHINE, images);
if (r < 0)
return r;
HASHMAP_FOREACH(image, images, i) {
char *p;
p = image_bus_path(image->name);
if (!p)
return -ENOMEM;
r = strv_consume(&l, p);
if (r < 0)
return r;
}
*nodes = TAKE_PTR(l);
return 1;
}