diff options
Diffstat (limited to 'src/machine/image-dbus.c')
| -rw-r--r-- | src/machine/image-dbus.c | 530 |
1 files changed, 530 insertions, 0 deletions
diff --git a/src/machine/image-dbus.c b/src/machine/image-dbus.c new file mode 100644 index 0000000..84dc95e --- /dev/null +++ b/src/machine/image-dbus.c @@ -0,0 +1,530 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <sys/file.h> +#include <sys/mount.h> + +#include "alloc-util.h" +#include "bus-get-properties.h" +#include "bus-label.h" +#include "bus-polkit.h" +#include "copy.h" +#include "discover-image.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 "missing_capability.h" +#include "mount-util.h" +#include "os-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 = ASSERT_PTR(userdata); + Manager *m = image->userdata; + pid_t child; + int r; + + assert(message); + + if (m->n_operations >= OPERATIONS_MAX) + return sd_bus_error_set(error, SD_BUS_ERROR_LIMITS_EXCEEDED, "Too many ongoing operations."); + + const char *details[] = { + "image", image->name, + "verb", "remove", + NULL + }; + + r = bus_verify_polkit_async( + message, + CAP_SYS_ADMIN, + "org.freedesktop.machine1.manage-images", + details, + 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 = ASSERT_PTR(userdata); + Manager *m = image->userdata; + const char *new_name; + int r; + + assert(message); + + 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); + + const char *details[] = { + "image", image->name, + "verb", "rename", + "new_name", new_name, + NULL + }; + + r = bus_verify_polkit_async( + message, + CAP_SYS_ADMIN, + "org.freedesktop.machine1.manage-images", + details, + 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 = ASSERT_PTR(userdata); + Manager *m = ASSERT_PTR(image->userdata); + const char *new_name; + int r, read_only; + pid_t child; + + assert(message); + + if (m->n_operations >= OPERATIONS_MAX) + return sd_bus_error_set(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); + + const char *details[] = { + "image", image->name, + "verb", "clone", + "new_name", new_name, + NULL + }; + + r = bus_verify_polkit_async( + message, + CAP_SYS_ADMIN, + "org.freedesktop.machine1.manage-images", + details, + 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-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 read_only, r; + + assert(message); + + r = sd_bus_message_read(message, "b", &read_only); + if (r < 0) + return r; + + const char *details[] = { + "image", image->name, + "verb", "mark_read_only", + "read_only", one_zero(read_only), + NULL + }; + + r = bus_verify_polkit_async( + message, + CAP_SYS_ADMIN, + "org.freedesktop.machine1.manage-images", + details, + 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_set(error, SD_BUS_ERROR_INVALID_ARGS, "New limit out of range"); + + const char *details[] = { + "machine", image->name, + "verb", "set_limit", + NULL + }; + + r = bus_verify_polkit_async( + message, + CAP_SYS_ADMIN, + "org.freedesktop.machine1.manage-images", + details, + 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); +} + +static int image_flush_cache(sd_event_source *s, void *userdata) { + Manager *m = ASSERT_PTR(userdata); + + assert(s); + + hashmap_clear(m->image_cache); + return 0; +} + +static 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; + } + + 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, NULL, &image); + if (r == -ENOENT) + return 0; + if (r < 0) + return r; + + image->userdata = m; + + r = hashmap_ensure_put(&m->image_cache, &image_hash_ops, 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 strjoin("/org/freedesktop/machine1/image/", e); +} + +static int image_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) { + _cleanup_hashmap_free_ Hashmap *images = NULL; + _cleanup_strv_free_ char **l = NULL; + Image *image; + int r; + + assert(bus); + assert(path); + assert(nodes); + + images = hashmap_new(&image_hash_ops); + if (!images) + return -ENOMEM; + + r = image_discover(IMAGE_MACHINE, NULL, images); + if (r < 0) + return r; + + HASHMAP_FOREACH(image, images) { + 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; +} + +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 +}; + +const BusObjectImplementation image_object = { + "/org/freedesktop/machine1/image", + "org.freedesktop.machine1.Image", + .fallback_vtables = BUS_FALLBACK_VTABLES({image_vtable, image_object_find}), + .node_enumerator = image_node_enumerator, +}; |