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PAM-less i3lock-color fork
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i3lock-color/i3lock.c

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/*
* vim:ts=4:sw=4:expandtab
*
* © 2010-2012 Michael Stapelberg
*
* See LICENSE for licensing information
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdbool.h>
#include <stdint.h>
#include <xcb/xcb.h>
#include <xcb/dpms.h>
#include <err.h>
#include <assert.h>
#include <security/pam_appl.h>
#include <X11/Xlib-xcb.h>
#include <getopt.h>
#include <string.h>
#include <ev.h>
#include <sys/mman.h>
#include <X11/XKBlib.h>
#include <X11/extensions/XKBfile.h>
#include <xkbcommon/xkbcommon.h>
#include <cairo.h>
#include <cairo/cairo-xcb.h>
#include "i3lock.h"
#include "xcb.h"
#include "cursors.h"
#include "unlock_indicator.h"
#include "xinerama.h"
/* We need this for libxkbfile */
static Display *display;
char color[7] = "ffffff";
uint32_t last_resolution[2];
xcb_window_t win;
static xcb_cursor_t cursor;
static pam_handle_t *pam_handle;
int input_position = 0;
/* Holds the password you enter (in UTF-8). */
static char password[512];
static bool beep = false;
bool debug_mode = false;
static bool dpms = false;
bool unlock_indicator = true;
static bool dont_fork = false;
struct ev_loop *main_loop;
static struct ev_timer *clear_pam_wrong_timeout;
extern unlock_state_t unlock_state;
extern pam_state_t pam_state;
static struct xkb_state *xkb_state;
static struct xkb_context *xkb_context;
static struct xkb_keymap *xkb_keymap;
cairo_surface_t *img = NULL;
bool tile = false;
/* isutf, u8_dec © 2005 Jeff Bezanson, public domain */
#define isutf(c) (((c) & 0xC0) != 0x80)
/*
* Decrements i to point to the previous unicode glyph
*
*/
void u8_dec(char *s, int *i) {
(void)(isutf(s[--(*i)]) || isutf(s[--(*i)]) || isutf(s[--(*i)]) || --(*i));
}
/*
* Loads the XKB keymap from the X11 server and feeds it to xkbcommon.
* Necessary so that we can properly let xkbcommon track the keyboard state and
* translate keypresses to utf-8.
*
* Ideally, xkbcommon would ship something like this itself, but as of now
* (version 0.2.0), it doesn’t.
*
*/
static bool load_keymap(void) {
bool ret = false;
XkbFileInfo result;
memset(&result, '\0', sizeof(result));
result.xkb = XkbGetKeyboard(display, XkbAllMapComponentsMask, XkbUseCoreKbd);
if (result.xkb == NULL) {
fprintf(stderr, "[i3lock] XKB: XkbGetKeyboard failed\n");
return false;
}
FILE *temp = tmpfile();
if (temp == NULL) {
fprintf(stderr, "[i3lock] could not create tempfile\n");
return false;
}
bool ok = XkbWriteXKBKeymap(temp, &result, false, false, NULL, NULL);
if (!ok) {
fprintf(stderr, "[i3lock] XkbWriteXKBKeymap failed\n");
goto out;
}
rewind(temp);
if (xkb_context == NULL) {
if ((xkb_context = xkb_context_new(0)) == NULL) {
fprintf(stderr, "[i3lock] could not create xkbcommon context\n");
goto out;
}
}
if (xkb_keymap != NULL)
xkb_keymap_unref(xkb_keymap);
if ((xkb_keymap = xkb_keymap_new_from_file(xkb_context, temp, XKB_KEYMAP_FORMAT_TEXT_V1, 0)) == NULL) {
fprintf(stderr, "[i3lock] xkb_keymap_new_from_file failed\n");
goto out;
}
struct xkb_state *new_state = xkb_state_new(xkb_keymap);
if (new_state == NULL) {
fprintf(stderr, "[i3lock] xkb_state_new failed\n");
goto out;
}
if (xkb_state != NULL)
xkb_state_unref(xkb_state);
xkb_state = new_state;
ret = true;
out:
XkbFreeKeyboard(result.xkb, XkbAllComponentsMask, true);
fclose(temp);
return ret;
}
/*
* Clears the memory which stored the password to be a bit safer against
* cold-boot attacks.
*
*/
static void clear_password_memory(void) {
/* A volatile pointer to the password buffer to prevent the compiler from
* optimizing this out. */
volatile char *vpassword = password;
for (int c = 0; c < sizeof(password); c++)
/* We store a non-random pattern which consists of the (irrelevant)
* index plus (!) the value of the beep variable. This prevents the
* compiler from optimizing the calls away, since the value of 'beep'
* is not known at compile-time. */
vpassword[c] = c + (int)beep;
}
/*
* Resets pam_state to STATE_PAM_IDLE 2 seconds after an unsuccesful
* authentication event.
*
*/
static void clear_pam_wrong(EV_P_ ev_timer *w, int revents) {
DEBUG("clearing pam wrong\n");
pam_state = STATE_PAM_IDLE;
unlock_state = STATE_STARTED;
redraw_screen();
/* Now free this timeout. */
ev_timer_stop(main_loop, clear_pam_wrong_timeout);
free(clear_pam_wrong_timeout);
clear_pam_wrong_timeout = NULL;
}
static void input_done(void) {
if (clear_pam_wrong_timeout) {
ev_timer_stop(main_loop, clear_pam_wrong_timeout);
free(clear_pam_wrong_timeout);
clear_pam_wrong_timeout = NULL;
}
pam_state = STATE_PAM_VERIFY;
redraw_screen();
if (pam_authenticate(pam_handle, 0) == PAM_SUCCESS) {
DEBUG("successfully authenticated\n");
clear_password_memory();
exit(0);
}
if (debug_mode)
fprintf(stderr, "Authentication failure\n");
pam_state = STATE_PAM_WRONG;
redraw_screen();
/* Clear this state after 2 seconds (unless the user enters another
* password during that time). */
ev_now_update(main_loop);
if ((clear_pam_wrong_timeout = calloc(sizeof(struct ev_timer), 1))) {
ev_timer_init(clear_pam_wrong_timeout, clear_pam_wrong, 2.0, 0.);
ev_timer_start(main_loop, clear_pam_wrong_timeout);
}
/* Cancel the clear_indicator_timeout, it would hide the unlock indicator
* too early. */
stop_clear_indicator_timeout();
/* beep on authentication failure, if enabled */
if (beep) {
xcb_bell(conn, 100);
xcb_flush(conn);
}
}
/*
* Called when the user releases a key. We need to leave the Mode_switch
* state when the user releases the Mode_switch key.
*
*/
static void handle_key_release(xcb_key_release_event_t *event) {
xkb_state_update_key(xkb_state, event->detail, XKB_KEY_UP);
}
static void redraw_timeout(EV_P_ ev_timer *w, int revents) {
redraw_screen();
ev_timer_stop(main_loop, w);
free(w);
}
/*
* Handle key presses. Fixes state, then looks up the key symbol for the
* given keycode, then looks up the key symbol (as UCS-2), converts it to
* UTF-8 and stores it in the password array.
*
*/
static void handle_key_press(xcb_key_press_event_t *event) {
xkb_keysym_t ksym;
char buffer[128];
int n;
ksym = xkb_state_key_get_one_sym(xkb_state, event->detail);
xkb_state_update_key(xkb_state, event->detail, XKB_KEY_DOWN);
/* The buffer will be null-terminated, so n >= 2 for 1 actual character. */
memset(buffer, '\0', sizeof(buffer));
n = xkb_keysym_to_utf8(ksym, buffer, sizeof(buffer));
switch (ksym) {
case XKB_KEY_Return:
case XKB_KEY_KP_Enter:
case XKB_KEY_XF86ScreenSaver:
password[input_position] = '\0';
unlock_state = STATE_KEY_PRESSED;
redraw_screen();
input_done();
case XKB_KEY_Escape:
input_position = 0;
clear_password_memory();
password[input_position] = '\0';
/* Hide the unlock indicator after a bit if the password buffer is
* empty. */
start_clear_indicator_timeout();
unlock_state = STATE_BACKSPACE_ACTIVE;
redraw_screen();
unlock_state = STATE_KEY_PRESSED;
return;
case XKB_KEY_BackSpace:
if (input_position == 0)
return;
/* decrement input_position to point to the previous glyph */
u8_dec(password, &input_position);
password[input_position] = '\0';
/* Hide the unlock indicator after a bit if the password buffer is
* empty. */
start_clear_indicator_timeout();
unlock_state = STATE_BACKSPACE_ACTIVE;
redraw_screen();
unlock_state = STATE_KEY_PRESSED;
return;
}
if ((input_position + 8) >= sizeof(password))
return;
#if 0
/* FIXME: handle all of these? */
printf("is_keypad_key = %d\n", xcb_is_keypad_key(sym));
printf("is_private_keypad_key = %d\n", xcb_is_private_keypad_key(sym));
printf("xcb_is_cursor_key = %d\n", xcb_is_cursor_key(sym));
printf("xcb_is_pf_key = %d\n", xcb_is_pf_key(sym));
printf("xcb_is_function_key = %d\n", xcb_is_function_key(sym));
printf("xcb_is_misc_function_key = %d\n", xcb_is_misc_function_key(sym));
printf("xcb_is_modifier_key = %d\n", xcb_is_modifier_key(sym));
#endif
if (n < 2)
return;
/* store it in the password array as UTF-8 */
memcpy(password+input_position, buffer, n-1);
input_position += n-1;
DEBUG("current password = %.*s\n", input_position, password);
unlock_state = STATE_KEY_ACTIVE;
redraw_screen();
unlock_state = STATE_KEY_PRESSED;
struct ev_timer *timeout = calloc(sizeof(struct ev_timer), 1);
if (timeout) {
ev_timer_init(timeout, redraw_timeout, 0.25, 0.);
ev_timer_start(main_loop, timeout);
}
stop_clear_indicator_timeout();
}
/*
* A visibility notify event will be received when the visibility (= can the
* user view the complete window) changes, so for example when a popup overlays
* some area of the i3lock window.
*
* In this case, we raise our window on top so that the popup (or whatever is
* hiding us) gets hidden.
*
*/
static void handle_visibility_notify(xcb_visibility_notify_event_t *event) {
if (event->state != XCB_VISIBILITY_UNOBSCURED) {
uint32_t values[] = { XCB_STACK_MODE_ABOVE };
xcb_configure_window(conn, event->window, XCB_CONFIG_WINDOW_STACK_MODE, values);
xcb_flush(conn);
}
}
/*
* Called when the keyboard mapping changes. We update our symbols.
*
*/
static void handle_mapping_notify(xcb_mapping_notify_event_t *event) {
/* We ignore errors — if the new keymap cannot be loaded it’s better if the
* screen stays locked and the user intervenes by using killall i3lock. */
(void)load_keymap();
}
/*
* Called when the properties on the root window change, e.g. when the screen
* resolution changes. If so we update the window to cover the whole screen
* and also redraw the image, if any.
*
*/
void handle_screen_resize(void) {
xcb_get_geometry_cookie_t geomc;
xcb_get_geometry_reply_t *geom;
geomc = xcb_get_geometry(conn, screen->root);
if ((geom = xcb_get_geometry_reply(conn, geomc, 0)) == NULL)
return;
if (last_resolution[0] == geom->width &&
last_resolution[1] == geom->height) {
free(geom);
return;
}
last_resolution[0] = geom->width;
last_resolution[1] = geom->height;
free(geom);
redraw_screen();
uint32_t mask = XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT;
xcb_configure_window(conn, win, mask, last_resolution);
xcb_flush(conn);
xinerama_query_screens();
redraw_screen();
}
/*
* Callback function for PAM. We only react on password request callbacks.
*
*/
static int conv_callback(int num_msg, const struct pam_message **msg,
struct pam_response **resp, void *appdata_ptr)
{
if (num_msg == 0)
return 1;
/* PAM expects an array of responses, one for each message */
if ((*resp = calloc(num_msg, sizeof(struct pam_response))) == NULL) {
perror("calloc");
return 1;
}
for (int c = 0; c < num_msg; c++) {
if (msg[c]->msg_style != PAM_PROMPT_ECHO_OFF &&
msg[c]->msg_style != PAM_PROMPT_ECHO_ON)
continue;
/* return code is currently not used but should be set to zero */
resp[c]->resp_retcode = 0;
if ((resp[c]->resp = strdup(password)) == NULL) {
perror("strdup");
return 1;
}
}
return 0;
}
/*
* This callback is only a dummy, see xcb_prepare_cb and xcb_check_cb.
* See also man libev(3): "ev_prepare" and "ev_check" - customise your event loop
*
*/
static void xcb_got_event(EV_P_ struct ev_io *w, int revents) {
/* empty, because xcb_prepare_cb and xcb_check_cb are used */
}
/*
* Flush before blocking (and waiting for new events)
*
*/
static void xcb_prepare_cb(EV_P_ ev_prepare *w, int revents) {
xcb_flush(conn);
}
/*
* Instead of polling the X connection socket we leave this to
* xcb_poll_for_event() which knows better than we can ever know.
*
*/
static void xcb_check_cb(EV_P_ ev_check *w, int revents) {
xcb_generic_event_t *event;
while ((event = xcb_poll_for_event(conn)) != NULL) {
if (event->response_type == 0) {
xcb_generic_error_t *error = (xcb_generic_error_t*)event;
if (debug_mode)
fprintf(stderr, "X11 Error received! sequence 0x%x, error_code = %d\n",
error->sequence, error->error_code);
free(event);
continue;
}
/* Strip off the highest bit (set if the event is generated) */
int type = (event->response_type & 0x7F);
switch (type) {
case XCB_KEY_PRESS:
handle_key_press((xcb_key_press_event_t*)event);
break;
case XCB_KEY_RELEASE:
handle_key_release((xcb_key_release_event_t*)event);
/* If this was the backspace or escape key we are back at an
* empty input, so turn off the screen if DPMS is enabled */
if (dpms && input_position == 0)
dpms_turn_off_screen(conn);
break;
case XCB_VISIBILITY_NOTIFY:
handle_visibility_notify((xcb_visibility_notify_event_t*)event);
break;
case XCB_MAP_NOTIFY:
if (!dont_fork) {
/* After the first MapNotify, we never fork again. We don’t
* expect to get another MapNotify, but better be sure… */
dont_fork = true;
/* In the parent process, we exit */
if (fork() != 0)
exit(0);
}
break;
case XCB_MAPPING_NOTIFY:
handle_mapping_notify((xcb_mapping_notify_event_t*)event);
break;
case XCB_CONFIGURE_NOTIFY:
handle_screen_resize();
break;
}
free(event);
}
}
int main(int argc, char *argv[]) {
char *username;
char *image_path = NULL;
int ret;
struct pam_conv conv = {conv_callback, NULL};
int curs_choice = CURS_NONE;
int o;
int optind = 0;
struct option longopts[] = {
{"version", no_argument, NULL, 'v'},
{"nofork", no_argument, NULL, 'n'},
{"beep", no_argument, NULL, 'b'},
{"dpms", no_argument, NULL, 'd'},
{"color", required_argument, NULL, 'c'},
{"pointer", required_argument, NULL , 'p'},
{"debug", no_argument, NULL, 0},
{"help", no_argument, NULL, 'h'},
{"no-unlock-indicator", no_argument, NULL, 'u'},
{"image", required_argument, NULL, 'i'},
{"tiling", no_argument, NULL, 't'},
{NULL, no_argument, NULL, 0}
};
if ((username = getenv("USER")) == NULL)
errx(1, "USER environment variable not set, please set it.\n");
while ((o = getopt_long(argc, argv, "hvnbdc:p:ui:t", longopts, &optind)) != -1) {
switch (o) {
case 'v':
errx(EXIT_SUCCESS, "version " VERSION " © 2010-2012 Michael Stapelberg");
case 'n':
dont_fork = true;
break;
case 'b':
beep = true;
break;
case 'd':
dpms = true;
break;
case 'c': {
char *arg = optarg;
/* Skip # if present */
if (arg[0] == '#')
arg++;
if (strlen(arg) != 6 || sscanf(arg, "%06[0-9a-fA-F]", color) != 1)
errx(1, "color is invalid, it must be given in 3-byte hexadecimal format: rrggbb\n");
break;
}
case 'u':
unlock_indicator = false;
break;
case 'i':
image_path = strdup(optarg);
break;
case 't':
tile = true;
break;
case 'p':
if (!strcmp(optarg, "win")) {
curs_choice = CURS_WIN;
} else if (!strcmp(optarg, "default")) {
curs_choice = CURS_DEFAULT;
} else {
errx(1, "i3lock: Invalid pointer type given. Expected one of \"win\" or \"default\".\n");
}
break;
case 0:
if (strcmp(longopts[optind].name, "debug") == 0)
debug_mode = true;
break;
default:
errx(1, "Syntax: i3lock [-v] [-n] [-b] [-d] [-c color] [-u] [-p win|default]"
" [-i image.png] [-t]"
);
}
}
/* We need (relatively) random numbers for highlighting a random part of
* the unlock indicator upon keypresses. */
srand(time(NULL));
/* Initialize PAM */
ret = pam_start("i3lock", username, &conv, &pam_handle);
if (ret != PAM_SUCCESS)
errx(EXIT_FAILURE, "PAM: %s", pam_strerror(pam_handle, ret));
/* Using mlock() as non-super-user seems only possible in Linux. Users of other
* operating systems should use encrypted swap/no swap (or remove the ifdef and
* run i3lock as super-user). */
#if defined(__linux__)
/* Lock the area where we store the password in memory, we don’t want it to
* be swapped to disk. Since Linux 2.6.9, this does not require any
* privileges, just enough bytes in the RLIMIT_MEMLOCK limit. */
if (mlock(password, sizeof(password)) != 0)
err(EXIT_FAILURE, "Could not lock page in memory, check RLIMIT_MEMLOCK");
#endif
/* Initialize connection to X11 */
if ((display = XOpenDisplay(NULL)) == NULL)
errx(EXIT_FAILURE, "Could not connect to X11, maybe you need to set DISPLAY?");
XSetEventQueueOwner(display, XCBOwnsEventQueue);
conn = XGetXCBConnection(display);
/* Double checking that connection is good and operatable with xcb */
if (xcb_connection_has_error(conn))
errx(EXIT_FAILURE, "Could not connect to X11, maybe you need to set DISPLAY?");
/* When we cannot initially load the keymap, we better exit */
if (!load_keymap())
errx(EXIT_FAILURE, "Could not load keymap");
xinerama_init();
xinerama_query_screens();
/* if DPMS is enabled, check if the X server really supports it */
if (dpms) {
xcb_dpms_capable_cookie_t dpmsc = xcb_dpms_capable(conn);
xcb_dpms_capable_reply_t *dpmsr;
if ((dpmsr = xcb_dpms_capable_reply(conn, dpmsc, NULL))) {
if (!dpmsr->capable) {
if (debug_mode)
fprintf(stderr, "Disabling DPMS, X server not DPMS capable\n");
dpms = false;
}
free(dpmsr);
}
}
screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
last_resolution[0] = screen->width_in_pixels;
last_resolution[1] = screen->height_in_pixels;
xcb_change_window_attributes(conn, screen->root, XCB_CW_EVENT_MASK,
(uint32_t[]){ XCB_EVENT_MASK_STRUCTURE_NOTIFY });
if (image_path) {
/* Create a pixmap to render on, fill it with the background color */
img = cairo_image_surface_create_from_png(image_path);
/* In case loading failed, we just pretend no -i was specified. */
if (cairo_surface_status(img) != CAIRO_STATUS_SUCCESS) {
fprintf(stderr, "Could not load image \"%s\": cairo surface status %d\n",
image_path, cairo_surface_status(img));
img = NULL;
}
}
/* Pixmap on which the image is rendered to (if any) */
xcb_pixmap_t bg_pixmap = draw_image(last_resolution);
/* open the fullscreen window, already with the correct pixmap in place */
win = open_fullscreen_window(conn, screen, color, bg_pixmap);
xcb_free_pixmap(conn, bg_pixmap);
cursor = create_cursor(conn, screen, win, curs_choice);
grab_pointer_and_keyboard(conn, screen, cursor);
if (dpms)
dpms_turn_off_screen(conn);
/* Initialize the libev event loop. */
main_loop = EV_DEFAULT;
if (main_loop == NULL)
errx(EXIT_FAILURE, "Could not initialize libev. Bad LIBEV_FLAGS?\n");
struct ev_io *xcb_watcher = calloc(sizeof(struct ev_io), 1);
struct ev_check *xcb_check = calloc(sizeof(struct ev_check), 1);
struct ev_prepare *xcb_prepare = calloc(sizeof(struct ev_prepare), 1);
ev_io_init(xcb_watcher, xcb_got_event, xcb_get_file_descriptor(conn), EV_READ);
ev_io_start(main_loop, xcb_watcher);
ev_check_init(xcb_check, xcb_check_cb);
ev_check_start(main_loop, xcb_check);
ev_prepare_init(xcb_prepare, xcb_prepare_cb);
ev_prepare_start(main_loop, xcb_prepare);
/* Invoke the event callback once to catch all the events which were
* received up until now. ev will only pick up new events (when the X11
* file descriptor becomes readable). */
ev_invoke(main_loop, xcb_check, 0);
ev_loop(main_loop, 0);
}