X-Git-Url: https://git.xinqibao.xyz/slock.git/blobdiff_plain/763e52878dba100e79c6f4a837a92e1df0d41ae0..22eba05f3683c12fa6a5f898d08c33704c9fbb73:/slock.c
diff --git a/slock.c b/slock.c
index 824baa2..7127ebe 100644
--- a/slock.c
+++ b/slock.c
@@ -1,92 +1,408 @@
-/* (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 <grp.h>
+#include <pwd.h>
+#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
+#include <X11/extensions/Xrandr.h>
#include <X11/keysym.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
-int
-main(int argc, char **argv) {
- char buf[32], passwd[256];
- int num, prev_nitem;
- struct spwd *sp;
- unsigned int i, len;
- Bool running = True;
- KeySym ksym;
- Display *dpy;
- XEvent ev;
+#include "arg.h"
+#include "util.h"
+
+char *argv0;
+
+enum {
+ INIT,
+ INPUT,
+ FAILED,
+ NUMCOLS
+};
+
+#include "config.h"
+
+typedef struct {
+ int screen;
+ Window root, win;
+ Pixmap pmap;
+ unsigned long colors[NUMCOLS];
+} Lock;
+
+static Lock **locks;
+static int nscreens;
+static Bool rr;
+static int rrevbase;
+static int rrerrbase;
+
+static void
+die(const char *errstr, ...)
+{
+ va_list ap;
- if((argc > 1) && !strncmp(argv[1], "-v", 3)) {
- fputs("slock-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
- exit(EXIT_SUCCESS);
+ va_start(ap, errstr);
+ vfprintf(stderr, errstr, ap);
+ va_end(ap);
+ exit(1);
+}
+
+#ifdef __linux__
+#include <fcntl.h>
+#include <linux/oom.h>
+
+static void
+dontkillme(void)
+{
+ FILE *f;
+ const char oomfile[] = "/proc/self/oom_score_adj";
+
+ if (!(f = fopen(oomfile, "w"))) {
+ if (errno == ENOENT)
+ return;
+ die("slock: fopen %s: %s\n", oomfile, strerror(errno));
}
- if(!(sp = getspnam(getenv("USER")))) {
- fputs("slock: cannot retrieve password entry (make sure to suid slock)\n", stderr);
- exit(EXIT_FAILURE);
+ fprintf(f, "%d", OOM_SCORE_ADJ_MIN);
+ if (fclose(f)) {
+ if (errno == EACCES)
+ die("slock: unable to disable OOM killer. "
+ "suid or sgid set?\n");
+ else
+ die("slock: fclose %s: %s\n", oomfile,
+ strerror(errno));
}
- endspent();
- if(!(dpy = XOpenDisplay(0))) {
- fputs("slock: cannot open display\n", stderr);
- exit(EXIT_FAILURE);
+}
+#endif
+
+static const char *
+getpw(void)
+{
+ const char *rval;
+ struct passwd *pw;
+
+ /* Check if the current user has a password entry */
+ errno = 0;
+ if (!(pw = getpwuid(getuid()))) {
+ if (errno)
+ die("slock: getpwuid: %s\n", strerror(errno));
+ else
+ die("slock: cannot retrieve password entry\n");
}
+ rval = pw->pw_passwd;
- /* init */
- passwd[0] = 0;
- while(XGrabKeyboard(dpy, DefaultRootWindow(dpy), True, GrabModeAsync,
- GrabModeAsync, CurrentTime) != GrabSuccess)
- usleep(1000);
-
- /* main event loop */
- while(running && !XNextEvent(dpy, &ev))
- if(ev.type == KeyPress) {
- len = strlen(passwd);
- buf[0] = 0;
+#if HAVE_SHADOW_H
+ if (rval[0] == 'x' && rval[1] == '\0') {
+ struct spwd *sp;
+ if (!(sp = getspnam(getenv("USER"))))
+ die("slock: getspnam: cannot retrieve shadow entry (make sure to suid or sgid slock)\n");
+ rval = sp->sp_pwdp;
+ }
+#else
+ if (rval[0] == '*' && rval[1] == '\0') {
+#ifdef __OpenBSD__
+ if (!(pw = getpwnam_shadow(getenv("USER"))))
+ die("slock: getpwnam_shadow: cannot retrieve shadow entry (make sure to suid or sgid slock)\n");
+ rval = pw->pw_passwd;
+#else
+ die("slock: getpwuid: cannot retrieve shadow entry (make sure to suid or sgid slock)\n");
+#endif /* __OpenBSD__ */
+ }
+#endif /* HAVE_SHADOW_H */
+
+ return rval;
+}
+
+static void
+readpw(Display *dpy, const char *pws)
+{
+ char buf[32], passwd[256], *encrypted;
+ int num, screen, running, failure;
+ unsigned int len, color;
+ KeySym ksym;
+ XEvent ev;
+ static int oldc = INIT;
+
+ len = 0;
+ running = 1;
+ failure = 0;
+
+ /* 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) {
+ explicit_bzero(&buf, sizeof(buf));
num = XLookupString(&ev.xkey, buf, sizeof(buf), &ksym, 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;
- }
+ 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;
}
- switch(ksym) {
+ if (IsFunctionKey(ksym) ||
+ IsKeypadKey(ksym) ||
+ IsMiscFunctionKey(ksym) ||
+ IsPFKey(ksym) ||
+ IsPrivateKeypadKey(ksym))
+ continue;
+ switch (ksym) {
case XK_Return:
- running = strncmp(crypt(passwd, sp->sp_pwdp), sp->sp_pwdp, sizeof(passwd));
- passwd[0] = 0;
+ passwd[len] = 0;
+ errno = 0;
+ if (!(encrypted = crypt(passwd, pws)))
+ fprintf(stderr, "slock: crypt: %s\n", strerror(errno));
+ else
+ running = !!strcmp(encrypted, pws);
+ if (running) {
+ XBell(dpy, 100);
+ failure = True;
+ }
+ explicit_bzero(&passwd, sizeof(passwd));
+ len = 0;
break;
case XK_Escape:
- passwd[0] = 0;
+ explicit_bzero(&passwd, sizeof(passwd));
+ len = 0;
break;
case XK_BackSpace:
- if(len)
- passwd[--len] = 0;
+ if (len)
+ passwd[len--] = 0;
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;
}
- }
+ color = len ? INPUT : (failure || failonclear ? FAILED : INIT);
+ if (running && oldc != color) {
+ for (screen = 0; screen < nscreens; screen++) {
+ XSetWindowBackground(dpy, locks[screen]->win, locks[screen]->colors[color]);
+ XClearWindow(dpy, locks[screen]->win);
+ }
+ oldc = color;
+ }
+ } else if (rr && ev.type == rrevbase + RRScreenChangeNotify) {
+ XRRScreenChangeNotifyEvent *rre = (XRRScreenChangeNotifyEvent*)&ev;
+ for (screen = 0; screen < nscreens; screen++) {
+ if (locks[screen]->win == rre->window) {
+ XResizeWindow(dpy, locks[screen]->win, rre->width, rre->height);
+ XClearWindow(dpy, locks[screen]->win);
+ }
+ }
+ } 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);
+ XUngrabKeyboard(dpy, CurrentTime);
+ XFreeColors(dpy, DefaultColormap(dpy, lock->screen), lock->colors, NUMCOLS, 0);
+ XFreePixmap(dpy, lock->pmap);
+ XDestroyWindow(dpy, lock->win);
+
+ free(lock);
+}
+
+static void
+cleanup(Display *dpy)
+{
+ int s;
+
+ for (s = 0; s < nscreens; ++s)
+ unlockscreen(dpy, locks[s]);
+
+ free(locks);
XCloseDisplay(dpy);
+}
+
+static Lock *
+lockscreen(Display *dpy, int screen)
+{
+ char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
+ int i, ptgrab, kbgrab;
+ Lock *lock;
+ XColor color, dummy;
+ XSetWindowAttributes wa;
+ Cursor invisible;
+
+ if (dpy == NULL || screen < 0 || !(lock = malloc(sizeof(Lock))))
+ return NULL;
+
+ lock->screen = screen;
+ lock->root = RootWindow(dpy, lock->screen);
+
+ for (i = 0; i < NUMCOLS; i++) {
+ XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen), colorname[i], &color, &dummy);
+ lock->colors[i] = color.pixel;
+ }
+
+ /* init */
+ wa.override_redirect = 1;
+ wa.background_pixel = lock->colors[INIT];
+ 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);
+ 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);
+
+ /* Try to grab mouse pointer *and* keyboard for 600ms, else fail the lock */
+ for (i = 0, ptgrab = kbgrab = -1; i < 6; i++) {
+ if (ptgrab != GrabSuccess) {
+ ptgrab = XGrabPointer(dpy, lock->root, False,
+ ButtonPressMask | ButtonReleaseMask |
+ PointerMotionMask, GrabModeAsync,
+ GrabModeAsync, None, invisible, CurrentTime);
+ }
+ if (kbgrab != GrabSuccess) {
+ kbgrab = XGrabKeyboard(dpy, lock->root, True,
+ GrabModeAsync, GrabModeAsync, CurrentTime);
+ }
+
+ /* input is grabbed: we can lock the screen */
+ if (ptgrab == GrabSuccess && kbgrab == GrabSuccess) {
+ XMapRaised(dpy, lock->win);
+ if (rr)
+ XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask);
+
+ XSelectInput(dpy, lock->root, SubstructureNotifyMask);
+ return lock;
+ }
+
+ /* retry on AlreadyGrabbed but fail on other errors */
+ if ((ptgrab != AlreadyGrabbed && ptgrab != GrabSuccess) ||
+ (kbgrab != AlreadyGrabbed && kbgrab != GrabSuccess))
+ break;
+
+ usleep(100000);
+ }
+
+ /* we couldn't grab all input: fail out */
+ if (ptgrab != GrabSuccess)
+ fprintf(stderr, "slock: unable to grab mouse pointer for screen %d\n", screen);
+ if (kbgrab != GrabSuccess)
+ fprintf(stderr, "slock: unable to grab keyboard for screen %d\n", screen);
+ return NULL;
+}
+
+static void
+usage(void)
+{
+ die("usage: slock [-v] [cmd [arg ...]]\n");
+}
+
+int
+main(int argc, char **argv) {
+ struct passwd *pwd;
+ struct group *grp;
+ uid_t duid;
+ gid_t dgid;
+ const char *pws;
+ Display *dpy;
+ int s, nlocks;
+
+ ARGBEGIN {
+ case 'v':
+ fprintf(stderr, "slock-"VERSION"\n");
+ return 0;
+ default:
+ usage();
+ } ARGEND
+
+ /* validate drop-user and -group */
+ errno = 0;
+ if (!(pwd = getpwnam(user)))
+ die("slock: getpwnam %s: %s\n", user, errno ?
+ strerror(errno) : "user entry not found");
+ duid = pwd->pw_uid;
+ errno = 0;
+ if (!(grp = getgrnam(group)))
+ die("slock: getgrnam %s: %s\n", group, errno ?
+ strerror(errno) : "group entry not found");
+ dgid = grp->gr_gid;
+
+#ifdef __linux__
+ dontkillme();
+#endif
+
+ pws = getpw();
+ if (strlen(pws) < 2)
+ die("slock: failed to get user password hash.\n");
+
+ if (!(dpy = XOpenDisplay(NULL)))
+ die("slock: cannot open display\n");
+
+ /* drop privileges */
+ if (setgroups(0, NULL) < 0)
+ die("slock: setgroups: %s\n", strerror(errno));
+ if (setgid(dgid) < 0)
+ die("slock: setgid: %s\n", strerror(errno));
+ if (setuid(duid) < 0)
+ die("slock: setuid: %s\n", strerror(errno));
+
+ /* check for Xrandr support */
+ rr = XRRQueryExtension(dpy, &rrevbase, &rrerrbase);
+
+ /* get number of screens in display "dpy" and blank them */
+ nscreens = ScreenCount(dpy);
+ if (!(locks = calloc(nscreens, sizeof(Lock *)))) {
+ XCloseDisplay(dpy);
+ die("slock: out of memory\n");
+ }
+ for (nlocks = 0, s = 0; s < nscreens; s++) {
+ if ((locks[s] = lockscreen(dpy, s)) != NULL)
+ nlocks++;
+ else
+ break;
+ }
+ XSync(dpy, 0);
+
+ /* did we manage to lock everything? */
+ if (nlocks != nscreens) {
+ cleanup(dpy);
+ return 1;
+ }
+
+ /* run post-lock command */
+ if (argc > 0) {
+ switch (fork()) {
+ case -1:
+ cleanup(dpy);
+ die("slock: fork failed: %s\n", strerror(errno));
+ case 0:
+ if (close(ConnectionNumber(dpy)) < 0)
+ die("slock: close: %s\n", strerror(errno));
+ execvp(argv[0], argv);
+ fprintf(stderr, "slock: execvp %s: %s\n", argv[0],
+ strerror(errno));
+ _exit(1);
+ }
+ }
+
+ /* everything is now blank. Wait for the correct password */
+ readpw(dpy, pws);
+
+ /* password ok, unlock everything and quit */
+ cleanup(dpy);
+
return 0;
}