/* SPDX-License-Identifier: LGPL-2.1+ */
#include "alloc-util.h"
#include "bus-common-errors.h"
#include "bus-label.h"
#include "bus-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "io-util.h"
#include "machine-image.h"
#include "portable.h"
#include "portabled-bus.h"
#include "portabled-image-bus.h"
#include "portabled-image.h"
#include "portabled.h"
#include "process-util.h"
#include "strv.h"
#include "user-util.h"
static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_type, image_type, ImageType);
int bus_image_common_get_os_release(
Manager *m,
sd_bus_message *message,
const char *name_or_path,
Image *image,
sd_bus_error *error) {
int r;
assert(name_or_path || image);
assert(message);
if (!m) {
assert(image);
m = image->userdata;
}
r = bus_image_acquire(m,
message,
name_or_path,
image,
BUS_IMAGE_AUTHENTICATE_BY_PATH,
"org.freedesktop.portable1.inspect-images",
&image,
error);
if (r < 0)
return r;
if (r == 0) /* Will call us back */
return 1;
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);
}
static int bus_image_method_get_os_release(sd_bus_message *message, void *userdata, sd_bus_error *error) {
return bus_image_common_get_os_release(NULL, message, NULL, userdata, error);
}
static int append_fd(sd_bus_message *m, PortableMetadata *d) {
_cleanup_fclose_ FILE *f = NULL;
_cleanup_free_ char *buf = NULL;
size_t n;
int r;
assert(m);
assert(d);
assert(d->fd >= 0);
f = fdopen(d->fd, "re");
if (!f)
return -errno;
d->fd = -1;
r = read_full_stream(f, &buf, &n);
if (r < 0)
return r;
return sd_bus_message_append_array(m, 'y', buf, n);
}
int bus_image_common_get_metadata(
Manager *m,
sd_bus_message *message,
const char *name_or_path,
Image *image,
sd_bus_error *error) {
_cleanup_(portable_metadata_unrefp) PortableMetadata *os_release = NULL;
_cleanup_(portable_metadata_hashmap_unrefp) Hashmap *unit_files = NULL;
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
_cleanup_free_ PortableMetadata **sorted = NULL;
_cleanup_strv_free_ char **matches = NULL;
size_t i;
int r;
assert(name_or_path || image);
assert(message);
if (!m) {
assert(image);
m = image->userdata;
}
r = sd_bus_message_read_strv(message, &matches);
if (r < 0)
return r;
r = bus_image_acquire(m,
message,
name_or_path,
image,
BUS_IMAGE_AUTHENTICATE_BY_PATH,
"org.freedesktop.portable1.inspect-images",
&image,
error);
if (r < 0)
return r;
if (r == 0) /* Will call us back */
return 1;
r = portable_extract(
image->path,
matches,
&os_release,
&unit_files,
error);
if (r < 0)
return r;
r = portable_metadata_hashmap_to_sorted_array(unit_files, &sorted);
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, "s", image->path);
if (r < 0)
return r;
r = append_fd(reply, os_release);
if (r < 0)
return r;
r = sd_bus_message_open_container(reply, 'a', "{say}");
if (r < 0)
return r;
for (i = 0; i < hashmap_size(unit_files); i++) {
r = sd_bus_message_open_container(reply, 'e', "say");
if (r < 0)
return r;
r = sd_bus_message_append(reply, "s", sorted[i]->name);
if (r < 0)
return r;
r = append_fd(reply, sorted[i]);
if (r < 0)
return r;
r = sd_bus_message_close_container(reply);
if (r < 0)
return r;
}
r = sd_bus_message_close_container(reply);
if (r < 0)
return r;
return sd_bus_send(NULL, reply, NULL);
}
static int bus_image_method_get_metadata(sd_bus_message *message, void *userdata, sd_bus_error *error) {
return bus_image_common_get_metadata(NULL, message, NULL, userdata, error);
}
static int bus_image_method_get_state(
sd_bus_message *message,
void *userdata,
sd_bus_error *error) {
Image *image = userdata;
PortableState state;
int r;
assert(message);
assert(image);
r = portable_get_state(
sd_bus_message_get_bus(message),
image->path,
0,
&state,
error);
if (r < 0)
return r;
return sd_bus_reply_method_return(message, "s", portable_state_to_string(state));
}
int bus_image_common_attach(
Manager *m,
sd_bus_message *message,
const char *name_or_path,
Image *image,
sd_bus_error *error) {
_cleanup_strv_free_ char **matches = NULL;
PortableChange *changes = NULL;
PortableFlags flags = 0;
const char *profile, *copy_mode;
size_t n_changes = 0;
int runtime, r;
assert(message);
assert(name_or_path || image);
if (!m) {
assert(image);
m = image->userdata;
}
r = sd_bus_message_read_strv(message, &matches);
if (r < 0)
return r;
r = sd_bus_message_read(message, "sbs", &profile, &runtime, ©_mode);
if (r < 0)
return r;
if (streq(copy_mode, "symlink"))
flags |= PORTABLE_PREFER_SYMLINK;
else if (streq(copy_mode, "copy"))
flags |= PORTABLE_PREFER_COPY;
else if (!isempty(copy_mode))
return sd_bus_reply_method_errorf(message, SD_BUS_ERROR_INVALID_ARGS, "Unknown copy mode '%s'", copy_mode);
if (runtime)
flags |= PORTABLE_RUNTIME;
r = bus_image_acquire(m,
message,
name_or_path,
image,
BUS_IMAGE_AUTHENTICATE_ALL,
"org.freedesktop.portable1.attach-images",
&image,
error);
if (r < 0)
return r;
if (r == 0) /* Will call us back */
return 1;
r = portable_attach(
sd_bus_message_get_bus(message),
image->path,
matches,
profile,
flags,
&changes,
&n_changes,
error);
if (r < 0)
goto finish;
r = reply_portable_changes(message, changes, n_changes);
finish:
portable_changes_free(changes, n_changes);
return r;
}
static int bus_image_method_attach(sd_bus_message *message, void *userdata, sd_bus_error *error) {
return bus_image_common_attach(NULL, message, NULL, userdata, error);
}
static int bus_image_method_detach(
sd_bus_message *message,
void *userdata,
sd_bus_error *error) {
PortableChange *changes = NULL;
Image *image = userdata;
Manager *m = image->userdata;
size_t n_changes = 0;
int r, runtime;
assert(message);
assert(image);
assert(m);
r = sd_bus_message_read(message, "b", &runtime);
if (r < 0)
return r;
r = bus_verify_polkit_async(
message,
CAP_SYS_ADMIN,
"org.freedesktop.portable1.attach-images",
NULL,
false,
UID_INVALID,
&m->polkit_registry,
error);
if (r < 0)
return r;
if (r == 0)
return 1; /* Will call us back */
r = portable_detach(
sd_bus_message_get_bus(message),
image->path,
runtime ? PORTABLE_RUNTIME : 0,
&changes,
&n_changes,
error);
if (r < 0)
goto finish;
r = reply_portable_changes(message, changes, n_changes);
finish:
portable_changes_free(changes, n_changes);
return r;
}
int bus_image_common_remove(
Manager *m,
sd_bus_message *message,
const char *name_or_path,
Image *image,
sd_bus_error *error) {
_cleanup_close_pair_ int errno_pipe_fd[2] = { -1, -1 };
_cleanup_(sigkill_waitp) pid_t child = 0;
PortableState state;
int r;
assert(message);
assert(name_or_path || image);
if (!m) {
assert(image);
m = image->userdata;
}
if (m->n_operations >= OPERATIONS_MAX)
return sd_bus_error_setf(error, SD_BUS_ERROR_LIMITS_EXCEEDED, "Too many ongoing operations.");
r = bus_image_acquire(m,
message,
name_or_path,
image,
BUS_IMAGE_AUTHENTICATE_ALL,
"org.freedesktop.portable1.manage-images",
&image,
error);
if (r < 0)
return r;
if (r == 0)
return 1; /* Will call us back */
r = portable_get_state(
sd_bus_message_get_bus(message),
image->path,
0,
&state,
error);
if (r < 0)
return r;
if (state != PORTABLE_DETACHED)
return sd_bus_error_set_errnof(error, EBUSY, "Image '%s' is not detached, refusing.", image->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-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, child, message, errno_pipe_fd[0], NULL);
if (r < 0)
return r;
child = 0;
errno_pipe_fd[0] = -1;
return 1;
}
static int bus_image_method_remove(sd_bus_message *message, void *userdata, sd_bus_error *error) {
return bus_image_common_remove(NULL, message, NULL, userdata, error);
}
int bus_image_common_mark_read_only(
Manager *m,
sd_bus_message *message,
const char *name_or_path,
Image *image,
sd_bus_error *error) {
int r, read_only;
assert(message);
assert(name_or_path || image);
if (!m) {
assert(image);
m = image->userdata;
}
r = sd_bus_message_read(message, "b", &read_only);
if (r < 0)
return r;
r = bus_image_acquire(m,
message,
name_or_path,
image,
BUS_IMAGE_AUTHENTICATE_ALL,
"org.freedesktop.portable1.manage-images",
&image,
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);
}
static int bus_image_method_mark_read_only(sd_bus_message *message, void *userdata, sd_bus_error *error) {
return bus_image_common_mark_read_only(NULL, message, NULL, userdata, error);
}
int bus_image_common_set_limit(
Manager *m,
sd_bus_message *message,
const char *name_or_path,
Image *image,
sd_bus_error *error) {
uint64_t limit;
int r;
assert(message);
assert(name_or_path || image);
if (!m) {
assert(image);
m = image->userdata;
}
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_image_acquire(m,
message,
name_or_path,
image,
BUS_IMAGE_AUTHENTICATE_ALL,
"org.freedesktop.portable1.manage-images",
&image,
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);
}
static int bus_image_method_set_limit(sd_bus_message *message, void *userdata, sd_bus_error *error) {
return bus_image_common_set_limit(NULL, message, NULL, userdata, error);
}
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("GetOSRelease", NULL, "a{ss}", bus_image_method_get_os_release, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("GetMedatadata", "as", "saya{say}", bus_image_method_get_metadata, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("GetState", NULL, "s", bus_image_method_get_state, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("Attach", "assbs", "a(sss)", bus_image_method_attach, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("Detach", "b", "a(sss)", bus_image_method_detach, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("Remove", NULL, NULL, bus_image_method_remove, 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_VTABLE_END
};
int bus_image_path(Image *image, char **ret) {
assert(image);
assert(ret);
if (!image->discoverable)
return -EINVAL;
return sd_bus_path_encode("/org/freedesktop/portable1/image", image->name, ret);
}
int bus_image_acquire(
Manager *m,
sd_bus_message *message,
const char *name_or_path,
Image *image,
ImageAcquireMode mode,
const char *polkit_action,
Image **ret,
sd_bus_error *error) {
_cleanup_(image_unrefp) Image *loaded = NULL;
Image *cached;
int r;
assert(m);
assert(message);
assert(name_or_path || image);
assert(mode >= 0);
assert(mode < _BUS_IMAGE_ACQUIRE_MODE_MAX);
assert(polkit_action || mode == BUS_IMAGE_REFUSE_BY_PATH);
assert(ret);
/* Acquires an 'Image' object if not acquired yet, and enforces necessary authentication while doing so. */
if (mode == BUS_IMAGE_AUTHENTICATE_ALL) {
r = bus_verify_polkit_async(
message,
CAP_SYS_ADMIN,
polkit_action,
NULL,
false,
UID_INVALID,
&m->polkit_registry,
error);
if (r < 0)
return r;
if (r == 0) { /* Will call us back */
*ret = NULL;
return 0;
}
}
/* Already passed in? */
if (image) {
*ret = image;
return 1;
}
/* Let's see if this image is already cached? */
cached = manager_image_cache_get(m, name_or_path);
if (cached) {
*ret = cached;
return 1;
}
if (image_name_is_valid(name_or_path)) {
/* If it's a short name, let's search for it */
r = image_find(IMAGE_PORTABLE, name_or_path, &loaded);
if (r == -ENOENT)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_PORTABLE_IMAGE, "No image '%s' found.", name_or_path);
/* other errors are handled below… */
} else {
/* Don't accept path if this is always forbidden */
if (mode == BUS_IMAGE_REFUSE_BY_PATH)
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Expected image name, not path in place of '%s'.", name_or_path);
if (!path_is_absolute(name_or_path))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Image name '%s' is not valid or not a valid path.", name_or_path);
if (!path_is_normalized(name_or_path))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Image path '%s' is not normalized.", name_or_path);
if (mode == BUS_IMAGE_AUTHENTICATE_BY_PATH) {
r = bus_verify_polkit_async(
message,
CAP_SYS_ADMIN,
polkit_action,
NULL,
false,
UID_INVALID,
&m->polkit_registry,
error);
if (r < 0)
return r;
if (r == 0) { /* Will call us back */
*ret = NULL;
return 0;
}
}
r = image_from_path(name_or_path, &loaded);
}
if (r < 0)
return r;
/* Add what we just loaded to the cache. This has as side-effect that the object stays in memory until the
* cache is purged again, i.e. at least for the current event loop iteration, which is all we need, and which
* means we don't actually need to ref the return object. */
r = manager_image_cache_add(m, loaded);
if (r < 0)
return r;
*ret = loaded;
return 1;
}
int bus_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;
int r;
assert(bus);
assert(path);
assert(interface);
assert(found);
r = sd_bus_path_decode(path, "/org/freedesktop/portable1/image", &e);
if (r < 0)
return 0;
if (r == 0)
goto not_found;
r = bus_image_acquire(m, sd_bus_get_current_message(bus), e, NULL, BUS_IMAGE_REFUSE_BY_PATH, NULL, &image, error);
if (r == -ENOENT)
goto not_found;
if (r < 0)
return r;
*found = image;
return 1;
not_found:
*found = NULL;
return 0;
}
int bus_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;
size_t n_allocated = 0, n = 0;
Manager *m = userdata;
Image *image;
Iterator i;
int r;
assert(bus);
assert(path);
assert(nodes);
images = hashmap_new(&string_hash_ops);
if (!images)
return -ENOMEM;
r = manager_image_cache_discover(m, images, error);
if (r < 0)
return r;
HASHMAP_FOREACH(image, images, i) {
char *p;
r = bus_image_path(image, &p);
if (r < 0)
return r;
if (!GREEDY_REALLOC(l, n_allocated, n+2)) {
free(p);
return -ENOMEM;
}
l[n++] = p;
l[n] = NULL;
}
*nodes = TAKE_PTR(l);
return 1;
}