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Refuse to start when SUID is detected

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This ensures that those surprised by the deprecation of SUID operation
receive an error rather than accidentally having sway run as root.

This detection will be removed in a future release.
This commit is contained in:
Kenny Levinsen 2022-06-01 20:01:19 +02:00 committed by Simon Ser
parent 251a648e2c
commit e5728052b5
3 changed files with 22 additions and 47 deletions
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2
include/sway/server.h
View file

@ -148,8 +148,6 @@ struct sway_debug {
extern struct sway_debug debug;
/* Prepares an unprivileged server_init by performing all privileged operations in advance */
bool server_privileged_prepare(struct sway_server *server);
bool server_init(struct sway_server *server);
void server_fini(struct sway_server *server);
bool server_start(struct sway_server *server);

46
sway/main.c
View file

@ -150,27 +150,17 @@ static void log_kernel(void) {
pclose(f);
}
static bool drop_permissions(void) {
if (getuid() != geteuid() || getgid() != getegid()) {
sway_log(SWAY_ERROR, "!!! DEPRECATION WARNING: "
"SUID privilege drop will be removed in a future release, please migrate to seatd-launch");
// Set the gid and uid in the correct order.
if (setgid(getgid()) != 0) {
sway_log(SWAY_ERROR, "Unable to drop root group, refusing to start");
return false;
}
if (setuid(getuid()) != 0) {
sway_log(SWAY_ERROR, "Unable to drop root user, refusing to start");
return false;
}
}
if (setgid(0) != -1 || setuid(0) != -1) {
sway_log(SWAY_ERROR, "Unable to drop root (we shouldn't be able to "
"restore it after setuid), refusing to start");
static bool detect_suid(void) {
if (geteuid() != 0 && getegid() != 0) {
return false;
}
if (getuid() == geteuid() && getgid() == getegid()) {
return false;
}
sway_log(SWAY_ERROR, "SUID operation is no longer supported, refusing to start. "
"This check will be removed in a future release.");
return true;
}
@ -319,6 +309,11 @@ int main(int argc, char **argv) {
}
}
// SUID operation is deprecated, so block it for now.
if (detect_suid()) {
exit(EXIT_FAILURE);
}
// Since wayland requires XDG_RUNTIME_DIR to be set, abort with just the
// clear error message (when not running as an IPC client).
if (!getenv("XDG_RUNTIME_DIR") && optind == argc) {
@ -357,9 +352,6 @@ int main(int argc, char **argv) {
"`sway -d 2>sway.log`.");
exit(EXIT_FAILURE);
}
if (!drop_permissions()) {
exit(EXIT_FAILURE);
}
char *socket_path = getenv("SWAYSOCK");
if (!socket_path) {
sway_log(SWAY_ERROR, "Unable to retrieve socket path");
@ -372,16 +364,6 @@ int main(int argc, char **argv) {
}
detect_proprietary(allow_unsupported_gpu);
if (!server_privileged_prepare(&server)) {
return 1;
}
if (!drop_permissions()) {
server_fini(&server);
exit(EXIT_FAILURE);
}
increase_nofile_limit();
// handle SIGTERM signals

21
sway/server.c
View file

@ -47,19 +47,6 @@
#include "sway/xwayland.h"
#endif
bool server_privileged_prepare(struct sway_server *server) {
sway_log(SWAY_DEBUG, "Preparing Wayland server initialization");
server->wl_display = wl_display_create();
server->wl_event_loop = wl_display_get_event_loop(server->wl_display);
server->backend = wlr_backend_autocreate(server->wl_display);
if (!server->backend) {
sway_log(SWAY_ERROR, "Unable to create backend");
return false;
}
return true;
}
static void handle_drm_lease_request(struct wl_listener *listener, void *data) {
/* We only offer non-desktop outputs, but in the future we might want to do
* more logic here. */
@ -76,6 +63,14 @@ static void handle_drm_lease_request(struct wl_listener *listener, void *data) {
bool server_init(struct sway_server *server) {
sway_log(SWAY_DEBUG, "Initializing Wayland server");
server->wl_display = wl_display_create();
server->wl_event_loop = wl_display_get_event_loop(server->wl_display);
server->backend = wlr_backend_autocreate(server->wl_display);
if (!server->backend) {
sway_log(SWAY_ERROR, "Unable to create backend");
return false;
}
server->renderer = wlr_renderer_autocreate(server->backend);
if (!server->renderer) {