-/* (C)opyright MMIV-MMV Anselm R. Garbe <garbeam at gmail dot com>
- * See LICENSE file for license details.
- */
-#define _XOPEN_SOURCE
+
+/* See LICENSE file for license details. */
+#define _XOPEN_SOURCE 500
+#if HAVE_SHADOW_H
#include <shadow.h>
+#endif
+
+#include <ctype.h>
+#include <errno.h>
+#include <pwd.h>
+#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
-int
-main(int argc, char **argv) {
+#if HAVE_BSD_AUTH
+#include <login_cap.h>
+#include <bsd_auth.h>
+#endif
+
+typedef struct {
+ int screen;
+ Window root, win;
+ Pixmap pmap;
+ unsigned long colors[2];
+} Lock;
+
+static Lock **locks;
+static int nscreens;
+static Bool running = True;
+
+static void
+die(const char *errstr, ...) {
+ 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
+static const char *
+getpw(void) { /* only run as root */
+ const char *rval;
+ struct passwd *pw;
+
+ errno = 0;
+ pw = getpwuid(getuid());
+ if (errno)
+ die("slock: getpwuid: %s\n", strerror(errno));
+ else if (!pw)
+ die("slock: cannot retrieve password entry (make sure to suid or sgid slock)\n");
+ endpwent();
+ rval = pw->pw_passwd;
+
+#if HAVE_SHADOW_H
+ if (strlen(rval) >= 1) { /* kludge, assumes pw placeholder entry has len >= 1 */
+ struct spwd *sp;
+ sp = getspnam(getenv("USER"));
+ 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
+{
char buf[32], passwd[256];
- int num, prev_nitem;
- struct spwd *sp;
- unsigned int i, len;
- Bool running = True;
+ int num, screen;
+ unsigned int len, llen;
KeySym ksym;
- Display *dpy;
XEvent ev;
- if((argc > 1) && !strncmp(argv[1], "-v", 3)) {
- fputs("slock-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
- exit(EXIT_SUCCESS);
- }
- if(!(sp = getspnam(getenv("USER")))) {
- fputs("slock: cannot retrieve password entry (make sure to suid slock)\n", stderr);
- exit(EXIT_FAILURE);
- }
- endspent();
- if(!(dpy = XOpenDisplay(0))) {
- fputs("slock: cannot open display\n", stderr);
- exit(EXIT_FAILURE);
- }
+ len = llen = 0;
+ running = True;
- /* init */
- passwd[0] = 0;
- while(XGrabKeyboard(dpy, DefaultRootWindow(dpy), True, GrabModeAsync,
- GrabModeAsync, CurrentTime) != GrabSuccess)
- usleep(1000);
-
- /* main event loop */
- while(running && !XNextEvent(dpy, &ev))
+ /* 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)) {
if(ev.type == KeyPress) {
- len = strlen(passwd);
buf[0] = 0;
- num = XLookupString(&ev.xkey, buf, sizeof(buf), &ksym, 0);
+ num = XLookupString(&ev.xkey, buf, sizeof buf, &ksym, 0);
+ if(IsKeypadKey(ksym)) {
+ 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;
+ }
if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
|| IsMiscFunctionKey(ksym) || IsPFKey(ksym)
|| IsPrivateKeypadKey(ksym))
continue;
- /* first check if a control mask is omitted */
- if(ev.xkey.state & ControlMask) {
- switch (ksym) {
- case XK_h:
- case XK_H: ksym = XK_BackSpace;
- break;
- case XK_u:
- case XK_U: passwd[0] = 0;
- continue;
- }
- }
switch(ksym) {
case XK_Return:
- running = strncmp(crypt(passwd, sp->sp_pwdp), sp->sp_pwdp, sizeof(passwd));
- passwd[0] = 0;
+ 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)
+ XBell(dpy, 100);
+ len = 0;
break;
case XK_Escape:
- passwd[0] = 0;
+ len = 0;
break;
case XK_BackSpace:
if(len)
- passwd[--len] = 0;
+ --len;
break;
default:
- if(num && !iscntrl((int) buf[0])) {
- buf[num] = 0;
- if(len)
- strncat(passwd, buf, sizeof(passwd));
- else
- strncpy(passwd, buf, sizeof(passwd));
+ if(num && !iscntrl((int) buf[0]) && (len + num < sizeof passwd)) {
+ memcpy(passwd + len, buf, num);
+ len += num;
}
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;
}
+ else for(screen = 0; screen < nscreens; screen++)
+ XRaiseWindow(dpy, locks[screen]->win);
+ }
+}
+
+static void
+unlockscreen(Display *dpy, Lock *lock) {
+ if(dpy == NULL || lock == NULL)
+ return;
+
+ 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) {
+ 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]))
+ 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);
XCloseDisplay(dpy);
+
return 0;
}
