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module-access: move EACCES check to pw_check_flatpak

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Decisions on whether an application is considered Flatpak sandboxed
should be in pw_check_flatpak.

Added the comment from 4169d9196d why we consider EACCES as
non-sandboxed. This is probably OK as it shouldn't occur on functioning
Flatpak setup.
This commit is contained in:
Pauli Virtanen 2022-08-13 21:32:51 +03:00
parent e3a69d1932
commit 4bd1cc8fcd
2 changed files with 11 additions and 17 deletions
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16
src/modules/flatpak-utils.h
View file

@ -76,20 +76,20 @@ static int pw_check_flatpak(pid_t pid, char **app_id, char **devices)
spa_autoclose int root_fd = openat(AT_FDCWD, root_path, O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_CLOEXEC | O_NOCTTY);
if (root_fd < 0) {
res = -errno;
pw_log_info("failed to open \"%s\": %s", root_path, spa_strerror(res));
if (res == -EACCES) {
struct statfs buf;
/* Access to the root dir isn't allowed. This can happen if the root is on a fuse
* filesystem, such as in a toolbox container. We will never have a fuse rootfs
* in the flatpak case, so in that case its safe to ignore this and
* continue to detect other types of apps. */
if (statfs(root_path, &buf) == 0 &&
buf.f_type == 0x65735546) /* FUSE_SUPER_MAGIC */
/* If we can't access the root filesystem, consider not sandboxed.
* This should not happen but for now it is a workaround for selinux
* where we can't access the gnome-shell root when it connects for
* screen sharing.
*/
return 0;
}
/* Not able to open the root dir shouldn't happen. Probably the app died and
* we're failing due to /proc/$pid not existing. In that case fail instead
* of treating this as privileged. */
pw_log_info("failed to open \"%s\": %s", root_path, spa_strerror(res));
return res;
}

10
src/modules/module-access.c
View file

@ -263,17 +263,11 @@ context_check_access(void *data, struct pw_impl_client *client)
res = pw_check_flatpak(pid, &flatpak_app_id, NULL);
if (res != 0) {
if (res < 0) {
if (res == -EACCES) {
access = "unrestricted";
goto granted;
}
if (res < 0)
pw_log_warn("%p: client %p sandbox check failed: %s",
impl, client, spa_strerror(res));
}
else if (res > 0) {
else
pw_log_debug(" %p: flatpak client %p added", impl, client);
}
access = "flatpak";
items[nitems++] = SPA_DICT_ITEM_INIT("pipewire.access.portal.app_id",
flatpak_app_id);