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flatpak-builder/document-portal/xdp-main.c

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#include "config.h"
#include <locale.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <gio/gio.h>
#include <gio/gunixfdlist.h>
#include "xdp-dbus.h"
#include "xdp-util.h"
#include "flatpak-db.h"
#include "flatpak-dbus.h"
#include "flatpak-utils.h"
#include "flatpak-portal-error.h"
#include "permission-store/permission-store-dbus.h"
#include "xdp-fuse.h"
#include <sys/eventfd.h>
#define TABLE_NAME "documents"
typedef struct
{
char *doc_id;
int fd;
char *owner;
guint flags;
GDBusMethodInvocation *finish_invocation;
} XdpDocUpdate;
static GMainLoop *loop = NULL;
static FlatpakDb *db = NULL;
static XdgPermissionStore *permission_store;
static int daemon_event_fd = -1;
static int final_exit_status = 0;
static GError *exit_error = NULL;
static dev_t fuse_dev = 0;
static GQueue get_mount_point_invocations = G_QUEUE_INIT;
static XdpDbusDocuments *dbus_api;
FlatpakDir *user_dir = NULL;
FlatpakDir *system_dir = NULL;
G_LOCK_DEFINE (db);
char **
xdp_list_apps (void)
{
AUTOLOCK (db);
return flatpak_db_list_apps (db);
}
char **
xdp_list_docs (void)
{
AUTOLOCK (db);
return flatpak_db_list_ids (db);
}
FlatpakDbEntry *
xdp_lookup_doc (const char *doc_id)
{
AUTOLOCK (db);
return flatpak_db_lookup (db, doc_id);
}
static gboolean
persist_entry (FlatpakDbEntry *entry)
{
guint32 flags = xdp_entry_get_flags (entry);
return (flags & XDP_ENTRY_FLAG_TRANSIENT) == 0;
}
static void
do_set_permissions (FlatpakDbEntry *entry,
const char *doc_id,
const char *app_id,
XdpPermissionFlags perms)
{
g_autofree const char **perms_s = xdg_unparse_permissions (perms);
g_autoptr(FlatpakDbEntry) new_entry = NULL;
g_debug ("set_permissions %s %s %x", doc_id, app_id, perms);
new_entry = flatpak_db_entry_set_app_permissions (entry, app_id, perms_s);
flatpak_db_set_entry (db, doc_id, new_entry);
if (persist_entry (new_entry))
{
xdg_permission_store_call_set_permission (permission_store,
TABLE_NAME,
FALSE,
doc_id,
app_id,
perms_s,
NULL,
NULL, NULL);
}
}
static void
portal_grant_permissions (GDBusMethodInvocation *invocation,
GVariant *parameters,
const char *app_id)
{
const char *target_app_id;
const char *id;
g_autofree const char **permissions = NULL;
XdpPermissionFlags perms;
g_autoptr(FlatpakDbEntry) entry = NULL;
g_variant_get (parameters, "(&s&s^a&s)", &id, &target_app_id, &permissions);
{
AUTOLOCK (db);
entry = flatpak_db_lookup (db, id);
if (entry == NULL)
{
g_dbus_method_invocation_return_error (invocation,
FLATPAK_PORTAL_ERROR, FLATPAK_PORTAL_ERROR_NOT_FOUND,
"No such document: %s", id);
return;
}
if (!flatpak_is_valid_name (target_app_id))
{
g_dbus_method_invocation_return_error (invocation,
FLATPAK_PORTAL_ERROR, FLATPAK_PORTAL_ERROR_INVALID_ARGUMENT,
"Invalid app name: %s", target_app_id);
return;
}
perms = xdp_parse_permissions (permissions);
/* Must have grant-permissions and all the newly granted permissions */
if (!xdp_entry_has_permissions (entry, app_id,
XDP_PERMISSION_FLAGS_GRANT_PERMISSIONS | perms))
{
g_dbus_method_invocation_return_error (invocation,
FLATPAK_PORTAL_ERROR, FLATPAK_PORTAL_ERROR_NOT_ALLOWED,
"Not enough permissions");
return;
}
do_set_permissions (entry, id, target_app_id,
perms | xdp_entry_get_permissions (entry, target_app_id));
}
/* Invalidate with lock dropped to avoid deadlock */
xdp_fuse_invalidate_doc_app (id, target_app_id);
g_dbus_method_invocation_return_value (invocation, g_variant_new ("()"));
}
static void
portal_revoke_permissions (GDBusMethodInvocation *invocation,
GVariant *parameters,
const char *app_id)
{
const char *target_app_id;
const char *id;
g_autofree const char **permissions = NULL;
g_autoptr(FlatpakDbEntry) entry = NULL;
XdpPermissionFlags perms;
g_variant_get (parameters, "(&s&s^a&s)", &id, &target_app_id, &permissions);
{
AUTOLOCK (db);
entry = flatpak_db_lookup (db, id);
if (entry == NULL)
{
g_dbus_method_invocation_return_error (invocation,
FLATPAK_PORTAL_ERROR, FLATPAK_PORTAL_ERROR_NOT_FOUND,
"No such document: %s", id);
return;
}
if (!flatpak_is_valid_name (target_app_id))
{
g_dbus_method_invocation_return_error (invocation,
FLATPAK_PORTAL_ERROR, FLATPAK_PORTAL_ERROR_INVALID_ARGUMENT,
"Invalid app name: %s", target_app_id);
return;
}
perms = xdp_parse_permissions (permissions);
/* Must have grant-permissions, or be itself */
if (!xdp_entry_has_permissions (entry, app_id,
XDP_PERMISSION_FLAGS_GRANT_PERMISSIONS) ||
strcmp (app_id, target_app_id) == 0)
{
g_dbus_method_invocation_return_error (invocation,
FLATPAK_PORTAL_ERROR, FLATPAK_PORTAL_ERROR_NOT_ALLOWED,
"Not enough permissions");
return;
}
do_set_permissions (entry, id, target_app_id,
~perms & xdp_entry_get_permissions (entry, target_app_id));
}
/* Invalidate with lock dropped to avoid deadlock */
xdp_fuse_invalidate_doc_app (id, target_app_id);
g_dbus_method_invocation_return_value (invocation, g_variant_new ("()"));
}
static void
portal_delete (GDBusMethodInvocation *invocation,
GVariant *parameters,
const char *app_id)
{
const char *id;
g_autoptr(FlatpakDbEntry) entry = NULL;
g_autofree const char **old_apps = NULL;
int i;
g_variant_get (parameters, "(s)", &id);
{
AUTOLOCK (db);
entry = flatpak_db_lookup (db, id);
if (entry == NULL)
{
g_dbus_method_invocation_return_error (invocation,
FLATPAK_PORTAL_ERROR, FLATPAK_PORTAL_ERROR_NOT_FOUND,
"No such document: %s", id);
return;
}
if (!xdp_entry_has_permissions (entry, app_id, XDP_PERMISSION_FLAGS_DELETE))
{
g_dbus_method_invocation_return_error (invocation,
FLATPAK_PORTAL_ERROR, FLATPAK_PORTAL_ERROR_NOT_ALLOWED,
"Not enough permissions");
return;
}
g_debug ("delete %s", id);
flatpak_db_set_entry (db, id, NULL);
if (persist_entry (entry))
xdg_permission_store_call_delete (permission_store, TABLE_NAME,
id, NULL, NULL, NULL);
}
/* All i/o is done now, so drop the lock so we can invalidate the fuse caches */
old_apps = flatpak_db_entry_list_apps (entry);
for (i = 0; old_apps[i] != NULL; i++)
xdp_fuse_invalidate_doc_app (id, old_apps[i]);
xdp_fuse_invalidate_doc_app (id, NULL);
/* Now fuse view is up-to-date, so we can return the call */
g_dbus_method_invocation_return_value (invocation, g_variant_new ("()"));
}
char *
do_create_doc (struct stat *parent_st_buf, const char *path, gboolean reuse_existing, gboolean persistent)
{
g_autoptr(GVariant) data = NULL;
g_autoptr(FlatpakDbEntry) entry = NULL;
g_auto(GStrv) ids = NULL;
char *id = NULL;
guint32 flags = 0;
if (!reuse_existing)
flags |= XDP_ENTRY_FLAG_UNIQUE;
if (!persistent)
flags |= XDP_ENTRY_FLAG_TRANSIENT;
data =
g_variant_ref_sink (g_variant_new ("(^ayttu)",
path,
(guint64) parent_st_buf->st_dev,
(guint64) parent_st_buf->st_ino,
flags));
if (reuse_existing)
{
ids = flatpak_db_list_ids_by_value (db, data);
if (ids[0] != NULL)
return g_strdup (ids[0]); /* Reuse pre-existing entry with same path */
}
while (TRUE)
{
g_autoptr(FlatpakDbEntry) existing = NULL;
g_clear_pointer (&id, g_free);
id = xdp_name_from_id ((guint32) g_random_int ());
existing = flatpak_db_lookup (db, id);
if (existing == NULL)
break;
}
g_debug ("create_doc %s", id);
entry = flatpak_db_entry_new (data);
flatpak_db_set_entry (db, id, entry);
if (persistent)
{
xdg_permission_store_call_set (permission_store,
TABLE_NAME,
TRUE,
id,
g_variant_new_array (G_VARIANT_TYPE ("{sas}"), NULL, 0),
g_variant_new_variant (data),
NULL, NULL, NULL);
}
return id;
}
static gboolean
validate_fd_common (int fd,
struct stat *st_buf,
char *path_buffer,
GError **error)
{
g_autofree char *proc_path = NULL;
ssize_t symlink_size;
int fd_flags;
proc_path = g_strdup_printf ("/proc/self/fd/%d", fd);
if (fd == -1 ||
/* Must be able to get fd flags */
(fd_flags = fcntl (fd, F_GETFL)) == -1 ||
/* Must be O_PATH */
((fd_flags & O_PATH) != O_PATH) ||
/* Must not be O_NOFOLLOW (because we want the target file) */
((fd_flags & O_NOFOLLOW) == O_NOFOLLOW) ||
/* Must be able to fstat */
fstat (fd, st_buf) < 0 ||
/* Must be a regular file */
(st_buf->st_mode & S_IFMT) != S_IFREG ||
/* Must be able to read path from /proc/self/fd */
/* This is an absolute and (at least at open time) symlink-expanded path */
(symlink_size = readlink (proc_path, path_buffer, PATH_MAX)) < 0)
{
g_set_error (error,
FLATPAK_PORTAL_ERROR, FLATPAK_PORTAL_ERROR_INVALID_ARGUMENT,
"Invalid fd passed");
return FALSE;
}
path_buffer[symlink_size] = 0;
return TRUE;
}
static char *
resolve_flatpak_path (const char *path,
const char *app_id)
{
g_autoptr(FlatpakDeploy) deploy = NULL;
g_autoptr(GError) my_error = NULL;
g_autoptr(GFile) deploy_dir = NULL;
g_autofree char *ref = NULL;
ref = flatpak_dir_current_ref (user_dir, app_id, NULL);
if (ref == NULL)
ref = flatpak_dir_current_ref (system_dir, app_id, NULL);
if (ref == NULL)
return NULL;
deploy_dir = flatpak_dir_get_if_deployed (user_dir, ref, NULL, NULL);
if (deploy_dir == NULL)
deploy_dir = flatpak_dir_get_if_deployed (system_dir, ref, NULL, NULL);
if (deploy_dir == NULL)
return NULL;
return g_build_filename (flatpak_file_get_path_cached (deploy_dir),
"files", path, NULL);
}
static gboolean
validate_parent_dir (const char *path,
struct stat *st_buf,
struct stat *real_parent_st_buf,
GError **error)
{
g_autofree char *dirname = NULL;
g_autofree char *name = NULL;
glnx_fd_close int dir_fd = -1;
struct stat real_st_buf;
/* We open the parent directory and do the stat in that, so that we have
* trustworthy parent dev/ino for later verification. Otherwise the caller
* could later replace a parent with a symlink and make us read some other file
*/
dirname = g_path_get_dirname (path);
name = g_path_get_basename (path);
dir_fd = open (dirname, O_CLOEXEC | O_PATH);
if (fstat (dir_fd, real_parent_st_buf) < 0 ||
fstatat (dir_fd, name, &real_st_buf, AT_SYMLINK_NOFOLLOW) < 0 ||
st_buf->st_dev != real_st_buf.st_dev ||
st_buf->st_ino != real_st_buf.st_ino)
{
/* Don't leak any info about real file path existence, etc */
g_set_error (error,
FLATPAK_PORTAL_ERROR, FLATPAK_PORTAL_ERROR_INVALID_ARGUMENT,
"Invalid fd passed");
return FALSE;
}
return TRUE;
}
static gboolean
validate_fd (int fd,
const char *app_id,
struct stat *st_buf,
struct stat *real_parent_st_buf,
char *path_buffer,
GError **error)
{
if (!validate_fd_common (fd, st_buf, path_buffer, error))
return FALSE;
if (app_id != NULL && *app_id != 0)
{
if (g_str_has_prefix (path_buffer, "/newroot/app/"))
{
char *rel_path = path_buffer + strlen ("/newroot/app/");
g_autofree char *app_path = NULL;
app_path = resolve_flatpak_path (rel_path, app_id);
if (app_path == NULL)
{
g_set_error (error,
FLATPAK_PORTAL_ERROR, FLATPAK_PORTAL_ERROR_INVALID_ARGUMENT,
"Invalid fd passed");
return FALSE;
}
strncpy (path_buffer, app_path, PATH_MAX);
}
else if (g_str_has_prefix (path_buffer, "/newroot/"))
{
char *rel_path = path_buffer + strlen ("/newroot");
g_strlcpy (path_buffer, rel_path, PATH_MAX);
}
}
if (!validate_parent_dir (path_buffer, st_buf, real_parent_st_buf, error))
return FALSE;
return TRUE;
}
static void
portal_add (GDBusMethodInvocation *invocation,
GVariant *parameters,
const char *app_id)
{
GDBusMessage *message;
GUnixFDList *fd_list;
g_autofree char *id = NULL;
int fd_id, fd, fds_len;
char path_buffer[PATH_MAX + 1];
const int *fds;
struct stat st_buf, real_parent_st_buf;
gboolean reuse_existing, persistent;
GError *error = NULL;
g_variant_get (parameters, "(hbb)", &fd_id, &reuse_existing, &persistent);
message = g_dbus_method_invocation_get_message (invocation);
fd_list = g_dbus_message_get_unix_fd_list (message);
fd = -1;
if (fd_list != NULL)
{
fds = g_unix_fd_list_peek_fds (fd_list, &fds_len);
if (fd_id < fds_len)
fd = fds[fd_id];
}
if (!validate_fd (fd, app_id, &st_buf, &real_parent_st_buf, path_buffer, &error))
{
g_dbus_method_invocation_take_error (invocation, error);
return;
}
if (st_buf.st_dev == fuse_dev)
{
/* The passed in fd is on the fuse filesystem itself */
g_autoptr(FlatpakDbEntry) old_entry = NULL;
id = xdp_fuse_lookup_id_for_inode (st_buf.st_ino);
g_debug ("path on fuse, id %s", id);
if (id == NULL)
{
g_dbus_method_invocation_return_error (invocation,
FLATPAK_PORTAL_ERROR, FLATPAK_PORTAL_ERROR_INVALID_ARGUMENT,
"Invalid fd passed");
return;
}
/* Don't lock the db before doing the fuse call above, because it takes takes a lock
that can block something calling back, causing a deadlock on the db lock */
AUTOLOCK (db);
/* If the entry doesn't exist anymore, fail. Also fail if not
* reuse_existing, because otherwise the user could use this to
* get a copy with permissions and thus escape later permission
* revocations
*/
old_entry = flatpak_db_lookup (db, id);
if (old_entry == NULL ||
!reuse_existing)
{
g_dbus_method_invocation_return_error (invocation,
FLATPAK_PORTAL_ERROR, FLATPAK_PORTAL_ERROR_INVALID_ARGUMENT,
"Invalid fd passed");
return;
}
}
else
{
{
AUTOLOCK (db);
id = do_create_doc (&real_parent_st_buf, path_buffer, reuse_existing, persistent);
if (app_id[0] != '\0')
{
g_autoptr(FlatpakDbEntry) entry = NULL;
XdpPermissionFlags perms =
XDP_PERMISSION_FLAGS_GRANT_PERMISSIONS |
XDP_PERMISSION_FLAGS_READ |
XDP_PERMISSION_FLAGS_WRITE;
{
entry = flatpak_db_lookup (db, id);
/* If its a unique one its safe for the creator to
delete it at will */
if (!reuse_existing)
perms |= XDP_PERMISSION_FLAGS_DELETE;
do_set_permissions (entry, id, app_id, perms);
}
}
}
/* Invalidate with lock dropped to avoid deadlock */
xdp_fuse_invalidate_doc_app (id, NULL);
if (app_id[0] != '\0')
xdp_fuse_invalidate_doc_app (id, app_id);
}
g_dbus_method_invocation_return_value (invocation,
g_variant_new ("(s)", id));
}
static void
portal_add_named (GDBusMethodInvocation *invocation,
GVariant *parameters,
const char *app_id)
{
GDBusMessage *message;
GUnixFDList *fd_list;
g_autofree char *id = NULL;
int parent_fd_id, parent_fd, fds_len;
const int *fds;
char parent_path_buffer[PATH_MAX + 1];
g_autofree char *path = NULL;
struct stat parent_st_buf;
const char *filename;
gboolean reuse_existing, persistent;
g_autoptr(GError) error = NULL;
g_autoptr(GVariant) filename_v = NULL;
g_variant_get (parameters, "(h@aybb)", &parent_fd_id, &filename_v, &reuse_existing, &persistent);
filename = g_variant_get_bytestring (filename_v);
/* This is only allowed from the host, or else we could leak existence of files */
if (*app_id != 0)
{
g_dbus_method_invocation_return_error (invocation,
FLATPAK_PORTAL_ERROR, FLATPAK_PORTAL_ERROR_NOT_ALLOWED,
"Not enough permissions");
return;
}
message = g_dbus_method_invocation_get_message (invocation);
fd_list = g_dbus_message_get_unix_fd_list (message);
parent_fd = -1;
if (fd_list != NULL)
{
fds = g_unix_fd_list_peek_fds (fd_list, &fds_len);
if (parent_fd_id < fds_len)
parent_fd = fds[parent_fd_id];
}
if (strchr (filename, '/') != NULL)
{
g_dbus_method_invocation_return_error (invocation,
FLATPAK_PORTAL_ERROR, FLATPAK_PORTAL_ERROR_INVALID_ARGUMENT,
"Invalid filename passed");
return;
}
if (!validate_fd_common (parent_fd, &parent_st_buf, parent_path_buffer, &error))
{
g_dbus_method_invocation_return_gerror (invocation, error);
return;
}
if (parent_st_buf.st_dev == fuse_dev)
{
g_dbus_method_invocation_return_error (invocation,
FLATPAK_PORTAL_ERROR, FLATPAK_PORTAL_ERROR_INVALID_ARGUMENT,
"Invalid fd passed");
return;
}
path = g_build_filename (parent_path_buffer, filename, NULL);
g_debug ("portal_add_named %s", path);
AUTOLOCK (db);
id = do_create_doc (&parent_st_buf, path, reuse_existing, persistent);
g_dbus_method_invocation_return_value (invocation,
g_variant_new ("(s)", id));
}
typedef void (*PortalMethod) (GDBusMethodInvocation *invocation,
GVariant *parameters,
const char *app_id);
static void
got_app_id_cb (GObject *source_object,
GAsyncResult *res,
gpointer user_data)
{
GDBusMethodInvocation *invocation = G_DBUS_METHOD_INVOCATION (source_object);
g_autoptr(GError) error = NULL;
g_autofree char *app_id = NULL;
PortalMethod portal_method = user_data;
app_id = flatpak_invocation_lookup_app_id_finish (invocation, res, &error);
if (app_id == NULL)
g_dbus_method_invocation_return_gerror (invocation, error);
else
portal_method (invocation, g_dbus_method_invocation_get_parameters (invocation), app_id);
}
static gboolean
handle_method (GCallback method_callback,
GDBusMethodInvocation *invocation)
{
flatpak_invocation_lookup_app_id (invocation, NULL, got_app_id_cb, method_callback);
return TRUE;
}
static gboolean
handle_get_mount_point (XdpDbusDocuments *object, GDBusMethodInvocation *invocation)
{
if (fuse_dev == 0)
{
/* We mustn't reply to this until the FUSE mount point is open for
* business. */
g_queue_push_tail (&get_mount_point_invocations, g_object_ref (invocation));
return TRUE;
}
xdp_dbus_documents_complete_get_mount_point (object, invocation, xdp_fuse_get_mountpoint ());
return TRUE;
}
static gboolean
portal_lookup (GDBusMethodInvocation *invocation,
GVariant *parameters,
const char *app_id)
{
const char *filename;
char path_buffer[PATH_MAX + 1];
int fd;
struct stat st_buf, real_parent_st_buf;
g_auto(GStrv) ids = NULL;
g_autofree char *id = NULL;
GError *error = NULL;
if (strcmp (app_id, "") != 0)
{
g_dbus_method_invocation_return_error (invocation,
FLATPAK_PORTAL_ERROR, FLATPAK_PORTAL_ERROR_NOT_ALLOWED,
"Not allowed in sandbox");
return TRUE;
}
g_variant_get (parameters, "(^&ay)", &filename);
fd = open (filename, O_PATH | O_CLOEXEC);
if (fd == -1)
{
glnx_set_error_from_errno (&error);
g_dbus_method_invocation_take_error (invocation, error);
return TRUE;
}
if (!validate_fd (fd, app_id, &st_buf, &real_parent_st_buf, path_buffer, &error))
{
g_dbus_method_invocation_take_error (invocation, error);
return TRUE;
}
if (st_buf.st_dev == fuse_dev)
{
/* The passed in fd is on the fuse filesystem itself */
id = xdp_fuse_lookup_id_for_inode (st_buf.st_ino);
g_debug ("path on fuse, id %s", id);
}
else
{
g_autoptr(GVariant) data = NULL;
data = g_variant_ref_sink (g_variant_new ("(^ayttu)",
path_buffer,
(guint64)real_parent_st_buf.st_dev,
(guint64)real_parent_st_buf.st_ino,
0));
ids = flatpak_db_list_ids_by_value (db, data);
if (ids[0] != NULL)
id = g_strdup (ids[0]);
}
g_dbus_method_invocation_return_value (invocation,
g_variant_new ("(s)", id ? id : ""));
return TRUE;
}
static GVariant *
get_app_permissions (FlatpakDbEntry *entry)
{
g_autofree const char **apps = NULL;
GVariantBuilder builder;
int i;
apps = flatpak_db_entry_list_apps (entry);
g_variant_builder_init (&builder, G_VARIANT_TYPE ("a{sas}"));
for (i = 0; apps[i] != NULL; i++)
{
g_autofree const char **permissions = flatpak_db_entry_list_permissions (entry, apps[i]);
g_variant_builder_add_value (&builder,
g_variant_new ("{s^as}", apps[i], permissions));
}
return g_variant_builder_end (&builder);
}
static GVariant *
get_path (FlatpakDbEntry *entry)
{
g_autoptr (GVariant) data = flatpak_db_entry_get_data (entry);
const char *path;
g_variant_get (data, "(^ayttu)", &path, NULL, NULL, NULL);
return g_variant_new_bytestring (path);
}
static gboolean
portal_info (GDBusMethodInvocation *invocation,
GVariant *parameters,
const char *app_id)
{
const char *id = NULL;
g_autoptr(FlatpakDbEntry) entry = NULL;
if (strcmp (app_id, "") != 0)
{
g_dbus_method_invocation_return_error (invocation,
FLATPAK_PORTAL_ERROR, FLATPAK_PORTAL_ERROR_NOT_ALLOWED,
"Not allowed in sandbox");
return TRUE;
}
g_variant_get (parameters, "(&s)", &id);
AUTOLOCK (db);
entry = flatpak_db_lookup (db, id);
if (!entry)
{
g_dbus_method_invocation_return_error (invocation,
FLATPAK_PORTAL_ERROR, FLATPAK_PORTAL_ERROR_INVALID_ARGUMENT,
"Invalid ID passed");
return TRUE;
}
g_dbus_method_invocation_return_value (invocation,
g_variant_new ("(@ay@a{sas})",
get_path (entry),
get_app_permissions (entry)));
return TRUE;
}
static gboolean
portal_list (GDBusMethodInvocation *invocation,
GVariant *parameters,
const char *app_id)
{
g_auto(GStrv) ids = NULL;
GVariantBuilder builder;
int i;
if (strcmp (app_id, "") != 0)
{
g_dbus_method_invocation_return_error (invocation,
FLATPAK_PORTAL_ERROR, FLATPAK_PORTAL_ERROR_NOT_ALLOWED,
"Not allowed in sandbox");
return TRUE;
}
g_variant_get (parameters, "(&s)", &app_id);
AUTOLOCK (db);
if (strcmp (app_id, "") == 0)
ids = flatpak_db_list_ids (db);
else
ids = flatpak_db_list_ids_by_app (db, app_id);
g_variant_builder_init (&builder, G_VARIANT_TYPE ("a{say}"));
for (i = 0; ids[i]; i++)
{
g_autoptr(FlatpakDbEntry) entry = NULL;
entry = flatpak_db_lookup (db, ids[i]);
g_variant_builder_add (&builder, "{s@ay}", ids[i], get_path (entry));
}
g_dbus_method_invocation_return_value (invocation,
g_variant_new ("(@a{say})",
g_variant_builder_end (&builder)));
return TRUE;
}
static void
on_bus_acquired (GDBusConnection *connection,
const gchar *name,
gpointer user_data)
{
GError *error = NULL;
dbus_api = xdp_dbus_documents_skeleton_new ();
g_signal_connect_swapped (dbus_api, "handle-get-mount-point", G_CALLBACK (handle_get_mount_point), NULL);
g_signal_connect_swapped (dbus_api, "handle-add", G_CALLBACK (handle_method), portal_add);
g_signal_connect_swapped (dbus_api, "handle-add-named", G_CALLBACK (handle_method), portal_add_named);
g_signal_connect_swapped (dbus_api, "handle-grant-permissions", G_CALLBACK (handle_method), portal_grant_permissions);
g_signal_connect_swapped (dbus_api, "handle-revoke-permissions", G_CALLBACK (handle_method), portal_revoke_permissions);
g_signal_connect_swapped (dbus_api, "handle-delete", G_CALLBACK (handle_method), portal_delete);
g_signal_connect_swapped (dbus_api, "handle-lookup", G_CALLBACK (handle_method), portal_lookup);
g_signal_connect_swapped (dbus_api, "handle-info", G_CALLBACK (handle_method), portal_info);
g_signal_connect_swapped (dbus_api, "handle-list", G_CALLBACK (handle_method), portal_list);
flatpak_connection_track_name_owners (connection);
if (!g_dbus_interface_skeleton_export (G_DBUS_INTERFACE_SKELETON (dbus_api),
connection,
"/org/freedesktop/portal/documents",
&error))
{
g_warning ("error: %s", error->message);
g_error_free (error);
}
}
static void
daemon_report_done (int status)
{
if (daemon_event_fd != -1)
{
guint64 counter;
counter = status + 1;
if (write (daemon_event_fd, &counter, sizeof (counter)) < 0)
g_critical ("Unable to report exit status: %s", g_strerror (errno));
daemon_event_fd = -1;
}
}
static void
do_exit (int status)
{
daemon_report_done (status);
exit (status);
}
static void
on_name_acquired (GDBusConnection *connection,
const gchar *name,
gpointer user_data)
{
struct stat stbuf;
gpointer invocation;
g_debug ("%s acquired", name);
if (!xdp_fuse_init (&exit_error))
{
final_exit_status = 6;
g_printerr ("fuse init failed: %s", exit_error->message);
g_main_loop_quit (loop);
return;
}
if (stat (xdp_fuse_get_mountpoint (), &stbuf) != 0)
{
g_set_error (&exit_error, G_DBUS_ERROR, G_DBUS_ERROR_FAILED, "fuse stat failed: %s", strerror (errno));
final_exit_status = 7;
g_printerr ("fuse stat failed: %s", strerror (errno));
g_main_loop_quit (loop);
return;
}
fuse_dev = stbuf.st_dev;
while ((invocation = g_queue_pop_head (&get_mount_point_invocations)) != NULL)
{
xdp_dbus_documents_complete_get_mount_point (dbus_api, invocation, xdp_fuse_get_mountpoint ());
g_object_unref (invocation);
}
daemon_report_done (0);
}
static void
on_name_lost (GDBusConnection *connection,
const gchar *name,
gpointer user_data)
{
g_debug ("%s lost", name);
if (final_exit_status == 0)
final_exit_status = 20;
if (exit_error == NULL)
g_set_error (&exit_error, G_DBUS_ERROR, G_DBUS_ERROR_FAILED, "D-Bus name \"%s\" lost", name);
g_main_loop_quit (loop);
}
static void
exit_handler (int sig)
{
/* We cannot set exit_error here, because malloc() in a signal handler
* is undefined behaviour. Rely on main() coping gracefully with
* that. */
g_main_loop_quit (loop);
}
static void
session_bus_closed (GDBusConnection *connection,
gboolean remote_peer_vanished,
GError *bus_error)
{
if (exit_error == NULL)
g_set_error (&exit_error, G_IO_ERROR, G_IO_ERROR_BROKEN_PIPE, "Disconnected from session bus");
g_main_loop_quit (loop);
}
static int
set_one_signal_handler (int sig,
void (*handler)(int),
int remove)
{
struct sigaction sa;
struct sigaction old_sa;
memset (&sa, 0, sizeof (struct sigaction));
sa.sa_handler = remove ? SIG_DFL : handler;
sigemptyset (&(sa.sa_mask));
sa.sa_flags = 0;
if (sigaction (sig, NULL, &old_sa) == -1)
{
g_warning ("cannot get old signal handler");
return -1;
}
if (old_sa.sa_handler == (remove ? handler : SIG_DFL) &&
sigaction (sig, &sa, NULL) == -1)
{
g_warning ("cannot set signal handler");
return -1;
}
return 0;
}
static gboolean opt_verbose;
static gboolean opt_daemon;
static gboolean opt_replace;
static gboolean opt_version;
static GOptionEntry entries[] = {
{ "verbose", 'v', 0, G_OPTION_ARG_NONE, &opt_verbose, "Print debug information", NULL },
{ "daemon", 'd', 0, G_OPTION_ARG_NONE, &opt_daemon, "Run in background", NULL },
{ "replace", 'r', 0, G_OPTION_ARG_NONE, &opt_replace, "Replace", NULL },
{ "version", 0, 0, G_OPTION_ARG_NONE, &opt_version, "Print version and exit", NULL },
{ NULL }
};
static void
message_handler (const gchar *log_domain,
GLogLevelFlags log_level,
const gchar *message,
gpointer user_data)
{
/* Make this look like normal console output */
if (log_level & G_LOG_LEVEL_DEBUG)
printf ("XDP: %s\n", message);
else
printf ("%s: %s\n", g_get_prgname (), message);
}
static void
printerr_handler (const gchar *string)
{
int is_tty = isatty (1);
const char *prefix = "";
const char *suffix = "";
if (is_tty)
{
prefix = "\x1b[31m\x1b[1m"; /* red, bold */
suffix = "\x1b[22m\x1b[0m"; /* bold off, color reset */
}
fprintf (stderr, "%serror: %s%s\n", prefix, suffix, string);
}
int
main (int argc,
char **argv)
{
guint owner_id;
g_autoptr(GError) error = NULL;
g_autofree char *path = NULL;
GDBusConnection *session_bus;
GOptionContext *context;
GDBusMethodInvocation *invocation;
setlocale (LC_ALL, "");
/* Avoid even loading gvfs to avoid accidental confusion */
g_setenv ("GIO_USE_VFS", "local", TRUE);
flatpak_migrate_from_xdg_app ();
g_set_printerr_handler (printerr_handler);
context = g_option_context_new ("- document portal");
g_option_context_add_main_entries (context, entries, NULL);
if (!g_option_context_parse (context, &argc, &argv, &error))
{
g_printerr ("Option parsing failed: %s", error->message);
return 1;
}
if (opt_version)
{
g_print ("%s\n", PACKAGE_STRING);
exit (EXIT_SUCCESS);
}
if (opt_daemon)
{
pid_t pid;
ssize_t read_res;
daemon_event_fd = eventfd (0, EFD_CLOEXEC);
pid = fork ();
if (pid != 0)
{
guint64 counter;
read_res = read (daemon_event_fd, &counter, sizeof (counter));
if (read_res != 8)
exit (1);
exit (counter - 1);
}
}
if (opt_verbose)
g_log_set_handler (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, message_handler, NULL);
g_set_prgname (argv[0]);
loop = g_main_loop_new (NULL, FALSE);
path = g_build_filename (g_get_user_data_dir (), "flatpak/db", TABLE_NAME, NULL);
db = flatpak_db_new (path, FALSE, &error);
if (db == NULL)
{
g_printerr ("Failed to load db: %s", error->message);
do_exit (2);
}
session_bus = g_bus_get_sync (G_BUS_TYPE_SESSION, NULL, &error);
if (session_bus == NULL)
{
g_printerr ("No session bus: %s", error->message);
do_exit (3);
}
permission_store = xdg_permission_store_proxy_new_sync (session_bus, G_DBUS_PROXY_FLAGS_NONE,
"org.freedesktop.impl.portal.PermissionStore",
"/org/freedesktop/impl/portal/PermissionStore",
NULL, &error);
if (permission_store == NULL)
{
g_print ("No permission store: %s", error->message);
do_exit (4);
}
user_dir = flatpak_dir_get_user ();
system_dir = flatpak_dir_get_system ();
/* We want do do our custom post-mainloop exit */
g_dbus_connection_set_exit_on_close (session_bus, FALSE);
g_signal_connect (session_bus, "closed", G_CALLBACK (session_bus_closed), NULL);
if (set_one_signal_handler (SIGHUP, exit_handler, 0) == -1 ||
set_one_signal_handler (SIGINT, exit_handler, 0) == -1 ||
set_one_signal_handler (SIGTERM, exit_handler, 0) == -1 ||
set_one_signal_handler (SIGPIPE, SIG_IGN, 0) == -1)
do_exit (5);
owner_id = g_bus_own_name (G_BUS_TYPE_SESSION,
"org.freedesktop.portal.Documents",
G_BUS_NAME_OWNER_FLAGS_ALLOW_REPLACEMENT | (opt_replace ? G_BUS_NAME_OWNER_FLAGS_REPLACE : 0),
on_bus_acquired,
on_name_acquired,
on_name_lost,
NULL,
NULL);
g_main_loop_run (loop);
while ((invocation = g_queue_pop_head (&get_mount_point_invocations)) != NULL)
{
if (exit_error != NULL)
g_dbus_method_invocation_return_gerror (invocation, exit_error);
else
g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR, G_DBUS_ERROR_FAILED, "Terminated");
g_object_unref (invocation);
}
xdp_fuse_exit ();
g_bus_unown_name (owner_id);
do_exit (final_exit_status);
return 0;
}
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