slock/slock.c

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C
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/* See LICENSE file for license details. */
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#define _XOPEN_SOURCE 500
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#if HAVE_SHADOW_H
#include <shadow.h>
#endif
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#include <ctype.h>
#include <errno.h>
#include <pwd.h>
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#include <stdarg.h>
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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <X11/keysym.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#if HAVE_BSD_AUTH
#include <login_cap.h>
#include <bsd_auth.h>
#endif
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typedef struct {
int screen;
Window root, win;
Pixmap pmap;
unsigned long colors[2];
} Lock;
static Lock **locks;
static int nscreens;
static Bool running = True;
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static void
die(const char *errstr, ...) {
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va_list ap;
va_start(ap, errstr);
vfprintf(stderr, errstr, ap);
va_end(ap);
exit(EXIT_FAILURE);
}
#ifdef __linux__
#include <fcntl.h>
static void
dontkillme(void) {
int fd;
fd = open("/proc/self/oom_score_adj", O_WRONLY);
if (fd < 0 && errno == ENOENT)
return;
if (fd < 0 || write(fd, "-1000\n", 6) != 6 || close(fd) != 0)
die("cannot disable the out-of-memory killer for this process\n");
}
#endif
#ifndef HAVE_BSD_AUTH
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static const char *
getpw(void) { /* only run as root */
const char *rval;
struct passwd *pw;
errno = 0;
pw = getpwuid(getuid());
if (!pw) {
if (errno)
die("slock: getpwuid: %s\n", strerror(errno));
else
die("slock: cannot retrieve password entry (make sure to suid or sgid slock)\n");
}
endpwent();
rval = pw->pw_passwd;
#if HAVE_SHADOW_H
if (rval[0] == 'x' && rval[1] == '\0') {
struct spwd *sp;
sp = getspnam(getenv("USER"));
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if(!sp)
die("slock: cannot retrieve shadow entry (make sure to suid or sgid slock)\n");
endspent();
rval = sp->sp_pwdp;
}
#endif
/* drop privileges */
if (geteuid() == 0
&& ((getegid() != pw->pw_gid && setgid(pw->pw_gid) < 0) || setuid(pw->pw_uid) < 0))
die("slock: cannot drop privileges\n");
return rval;
}
#endif
static void
#ifdef HAVE_BSD_AUTH
readpw(Display *dpy)
#else
readpw(Display *dpy, const char *pws)
#endif
{
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char buf[32], passwd[256];
int num, screen;
unsigned int len, llen;
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KeySym ksym;
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XEvent ev;
len = llen = 0;
running = True;
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/* As "slock" stands for "Simple X display locker", the DPMS settings
* had been removed and you can set it with "xset" or some other
* utility. This way the user can easily set a customized DPMS
* timeout. */
while(running && !XNextEvent(dpy, &ev)) {
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if(ev.type == KeyPress) {
buf[0] = 0;
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num = XLookupString(&ev.xkey, buf, sizeof buf, &ksym, 0);
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if(IsKeypadKey(ksym)) {
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if(ksym == XK_KP_Enter)
ksym = XK_Return;
else if(ksym >= XK_KP_0 && ksym <= XK_KP_9)
ksym = (ksym - XK_KP_0) + XK_0;
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}
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if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
|| IsMiscFunctionKey(ksym) || IsPFKey(ksym)
|| IsPrivateKeypadKey(ksym))
continue;
switch(ksym) {
case XK_Return:
passwd[len] = 0;
#ifdef HAVE_BSD_AUTH
running = !auth_userokay(getlogin(), NULL, "auth-xlock", passwd);
#else
running = !!strcmp(crypt(passwd, pws), pws);
#endif
if(running)
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XBell(dpy, 100);
len = 0;
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break;
case XK_Escape:
len = 0;
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break;
case XK_BackSpace:
if(len)
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--len;
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break;
default:
if(num && !iscntrl((int) buf[0]) && (len + num < sizeof passwd)) {
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memcpy(passwd + len, buf, num);
len += num;
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}
break;
}
if(llen == 0 && len != 0) {
for(screen = 0; screen < nscreens; screen++) {
XSetWindowBackground(dpy, locks[screen]->win, locks[screen]->colors[1]);
XClearWindow(dpy, locks[screen]->win);
}
} else if(llen != 0 && len == 0) {
for(screen = 0; screen < nscreens; screen++) {
XSetWindowBackground(dpy, locks[screen]->win, locks[screen]->colors[0]);
XClearWindow(dpy, locks[screen]->win);
}
}
llen = len;
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}
else for(screen = 0; screen < nscreens; screen++)
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XRaiseWindow(dpy, locks[screen]->win);
}
}
static void
unlockscreen(Display *dpy, Lock *lock) {
if(dpy == NULL || lock == NULL)
return;
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XUngrabPointer(dpy, CurrentTime);
XFreeColors(dpy, DefaultColormap(dpy, lock->screen), lock->colors, 2, 0);
XFreePixmap(dpy, lock->pmap);
XDestroyWindow(dpy, lock->win);
free(lock);
}
static Lock *
lockscreen(Display *dpy, int screen) {
char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
unsigned int len;
Lock *lock;
XColor color, dummy;
XSetWindowAttributes wa;
Cursor invisible;
if(dpy == NULL || screen < 0)
return NULL;
lock = malloc(sizeof(Lock));
if(lock == NULL)
return NULL;
lock->screen = screen;
lock->root = RootWindow(dpy, lock->screen);
/* init */
wa.override_redirect = 1;
wa.background_pixel = BlackPixel(dpy, lock->screen);
lock->win = XCreateWindow(dpy, lock->root, 0, 0, DisplayWidth(dpy, lock->screen), DisplayHeight(dpy, lock->screen),
0, DefaultDepth(dpy, lock->screen), CopyFromParent,
DefaultVisual(dpy, lock->screen), CWOverrideRedirect | CWBackPixel, &wa);
XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen), COLOR2, &color, &dummy);
lock->colors[1] = color.pixel;
XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen), COLOR1, &color, &dummy);
lock->colors[0] = color.pixel;
lock->pmap = XCreateBitmapFromData(dpy, lock->win, curs, 8, 8);
invisible = XCreatePixmapCursor(dpy, lock->pmap, lock->pmap, &color, &color, 0, 0);
XDefineCursor(dpy, lock->win, invisible);
XMapRaised(dpy, lock->win);
for(len = 1000; len; len--) {
if(XGrabPointer(dpy, lock->root, False, ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
GrabModeAsync, GrabModeAsync, None, invisible, CurrentTime) == GrabSuccess)
break;
usleep(1000);
}
if(running && (len > 0)) {
for(len = 1000; len; len--) {
if(XGrabKeyboard(dpy, lock->root, True, GrabModeAsync, GrabModeAsync, CurrentTime)
== GrabSuccess)
break;
usleep(1000);
}
}
running &= (len > 0);
if(!running) {
unlockscreen(dpy, lock);
lock = NULL;
}
else
XSelectInput(dpy, lock->root, SubstructureNotifyMask);
return lock;
}
static void
usage(void) {
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fprintf(stderr, "usage: slock [-v]\n");
exit(EXIT_FAILURE);
}
int
main(int argc, char **argv) {
#ifndef HAVE_BSD_AUTH
const char *pws;
#endif
Display *dpy;
int screen;
if((argc == 2) && !strcmp("-v", argv[1]))
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die("slock-%s, © 2006-2012 Anselm R Garbe\n", VERSION);
else if(argc != 1)
usage();
#ifdef __linux__
dontkillme();
#endif
if(!getpwuid(getuid()))
die("slock: no passwd entry for you\n");
#ifndef HAVE_BSD_AUTH
pws = getpw();
#endif
if(!(dpy = XOpenDisplay(0)))
die("slock: cannot open display\n");
/* Get the number of screens in display "dpy" and blank them all. */
nscreens = ScreenCount(dpy);
locks = malloc(sizeof(Lock *) * nscreens);
if(locks == NULL)
die("slock: malloc: %s\n", strerror(errno));
int nlocks = 0;
for(screen = 0; screen < nscreens; screen++) {
if ( (locks[screen] = lockscreen(dpy, screen)) != NULL)
nlocks++;
}
XSync(dpy, False);
/* Did we actually manage to lock something? */
if (nlocks == 0) { // nothing to protect
free(locks);
XCloseDisplay(dpy);
return 1;
}
/* Everything is now blank. Now wait for the correct password. */
#ifdef HAVE_BSD_AUTH
readpw(dpy);
#else
readpw(dpy, pws);
#endif
/* Password ok, unlock everything and quit. */
for(screen = 0; screen < nscreens; screen++)
unlockscreen(dpy, locks[screen]);
free(locks);
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XCloseDisplay(dpy);
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return 0;
}