mirror of
https://github.com/swaywm/sway.git
synced 2024-12-30 17:06:40 +01:00
c977349120
This involves setuid'ing swaylock, which then forks and drops perms on the parent process. The child process remains root and listens on a pipe for requests to validate passwords against /etc/shadow.
124 lines
3 KiB
C
124 lines
3 KiB
C
#define _XOPEN_SOURCE 500
|
|
#include <assert.h>
|
|
#include <pwd.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <wlr/util/log.h>
|
|
#include <xkbcommon/xkbcommon.h>
|
|
#include "swaylock/swaylock.h"
|
|
#include "swaylock/seat.h"
|
|
#include "unicode.h"
|
|
|
|
void clear_password_buffer(struct swaylock_password *pw) {
|
|
// Use volatile keyword so so compiler can't optimize this out.
|
|
volatile char *buffer = pw->buffer;
|
|
volatile char zero = '\0';
|
|
for (size_t i = 0; i < sizeof(buffer); ++i) {
|
|
buffer[i] = zero;
|
|
}
|
|
pw->len = 0;
|
|
}
|
|
|
|
static bool backspace(struct swaylock_password *pw) {
|
|
if (pw->len != 0) {
|
|
pw->buffer[--pw->len] = 0;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static void append_ch(struct swaylock_password *pw, uint32_t codepoint) {
|
|
size_t utf8_size = utf8_chsize(codepoint);
|
|
if (pw->len + utf8_size + 1 >= sizeof(pw->buffer)) {
|
|
// TODO: Display error
|
|
return;
|
|
}
|
|
utf8_encode(&pw->buffer[pw->len], codepoint);
|
|
pw->buffer[pw->len + utf8_size] = 0;
|
|
pw->len += utf8_size;
|
|
}
|
|
|
|
void swaylock_handle_key(struct swaylock_state *state,
|
|
xkb_keysym_t keysym, uint32_t codepoint) {
|
|
switch (keysym) {
|
|
case XKB_KEY_KP_Enter: /* fallthrough */
|
|
case XKB_KEY_Return:
|
|
if (state->args.ignore_empty && state->password.len == 0) {
|
|
break;
|
|
}
|
|
|
|
state->auth_state = AUTH_STATE_VALIDATING;
|
|
damage_state(state);
|
|
while (wl_display_dispatch(state->display) != -1 && state->run_display) {
|
|
bool ok = 1;
|
|
struct swaylock_surface *surface;
|
|
wl_list_for_each(surface, &state->surfaces, link) {
|
|
if (surface->dirty) {
|
|
ok = 0;
|
|
}
|
|
}
|
|
if (ok) {
|
|
break;
|
|
}
|
|
}
|
|
wl_display_flush(state->display);
|
|
|
|
if (attempt_password(&state->password)) {
|
|
state->run_display = false;
|
|
break;
|
|
}
|
|
state->auth_state = AUTH_STATE_INVALID;
|
|
damage_state(state);
|
|
break;
|
|
case XKB_KEY_Delete:
|
|
case XKB_KEY_BackSpace:
|
|
if (backspace(&state->password)) {
|
|
state->auth_state = AUTH_STATE_BACKSPACE;
|
|
} else {
|
|
state->auth_state = AUTH_STATE_CLEAR;
|
|
}
|
|
damage_state(state);
|
|
break;
|
|
case XKB_KEY_Escape:
|
|
clear_password_buffer(&state->password);
|
|
state->auth_state = AUTH_STATE_CLEAR;
|
|
damage_state(state);
|
|
break;
|
|
case XKB_KEY_Caps_Lock:
|
|
/* The state is getting active after this
|
|
* so we need to manually toggle it */
|
|
state->xkb.caps_lock = !state->xkb.caps_lock;
|
|
state->auth_state = AUTH_STATE_INPUT_NOP;
|
|
damage_state(state);
|
|
break;
|
|
case XKB_KEY_Shift_L:
|
|
case XKB_KEY_Shift_R:
|
|
case XKB_KEY_Control_L:
|
|
case XKB_KEY_Control_R:
|
|
case XKB_KEY_Meta_L:
|
|
case XKB_KEY_Meta_R:
|
|
case XKB_KEY_Alt_L:
|
|
case XKB_KEY_Alt_R:
|
|
case XKB_KEY_Super_L:
|
|
case XKB_KEY_Super_R:
|
|
state->auth_state = AUTH_STATE_INPUT_NOP;
|
|
damage_state(state);
|
|
break;
|
|
case XKB_KEY_u:
|
|
if (state->xkb.control) {
|
|
clear_password_buffer(&state->password);
|
|
state->auth_state = AUTH_STATE_CLEAR;
|
|
damage_state(state);
|
|
break;
|
|
}
|
|
// fallthrough
|
|
default:
|
|
if (codepoint) {
|
|
append_ch(&state->password, codepoint);
|
|
state->auth_state = AUTH_STATE_INPUT;
|
|
damage_state(state);
|
|
}
|
|
break;
|
|
}
|
|
}
|