X-Git-Url: https://git.armaanb.net/?p=slock.git;a=blobdiff_plain;f=slock.c;h=2b06ca2a9c3b79c6ef7b9fe6fa2686edab91be7f;hp=face75e7e3e09ba96453e7fea5b6a9aef9c21c22;hb=HEAD;hpb=66e31556db4921b5f24ced47dae5e1c7ea3bd150 diff --git a/slock.c b/slock.c index face75e..2b06ca2 100644 --- a/slock.c +++ b/slock.c @@ -1,4 +1,3 @@ - /* See LICENSE file for license details. */ #define _XOPEN_SOURCE 500 #if HAVE_SHADOW_H @@ -7,309 +6,431 @@ #include #include +#include #include #include #include #include #include #include +#include #include +#include +#include #include #include #include -#if HAVE_BSD_AUTH -#include -#include -#endif +#include "arg.h" +#include "util.h" -#include "config.h" +char *argv0; + +static time_t locktime; + +enum { + INIT, + INPUT, + FAILED, + NUMCOLS +}; -typedef struct { +struct lock { int screen; Window root, win; Pixmap pmap; - unsigned long colors[2]; -} Lock; + unsigned long colors[NUMCOLS]; +}; -static Lock **locks; -static int nscreens; -static Bool running = True; +struct xrandr { + int active; + int evbase; + int errbase; +}; + +#include "config.h" static void -die(const char *errstr, ...) { +die(const char *errstr, ...) +{ va_list ap; va_start(ap, errstr); vfprintf(stderr, errstr, ap); va_end(ap); - exit(EXIT_FAILURE); + exit(1); } #ifdef __linux__ #include +#include 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"); +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)); + } + fprintf(f, "%d", OOM_SCORE_ADJ_MIN); + if (fclose(f)) { + if (errno == EACCES) + die("slock: unable to disable OOM killer. " + "Make sure to suid or sgid slock.\n"); + else + die("slock: fclose %s: %s\n", oomfile, strerror(errno)); + } } #endif -#ifndef HAVE_BSD_AUTH static const char * -getpw(void) { /* only run as root */ - const char *rval; +gethash(void) +{ + const char *hash; struct passwd *pw; + /* Check if the current user has a password entry */ errno = 0; - pw = getpwuid(getuid()); - if (!pw) { + if (!(pw = getpwuid(getuid()))) { if (errno) die("slock: getpwuid: %s\n", strerror(errno)); else - die("slock: cannot retrieve password entry (make sure to suid or sgid slock)\n"); + die("slock: cannot retrieve password entry\n"); } - rval = pw->pw_passwd; + hash = pw->pw_passwd; #if HAVE_SHADOW_H - if (rval[0] == 'x' && rval[1] == '\0') { + if (!strcmp(hash, "x")) { struct spwd *sp; - sp = getspnam(getenv("USER")); - if(!sp) - die("slock: cannot retrieve shadow entry (make sure to suid or sgid slock)\n"); - rval = sp->sp_pwdp; + if (!(sp = getspnam(pw->pw_name))) + die("slock: getspnam: cannot retrieve shadow entry. " + "Make sure to suid or sgid slock.\n"); + hash = sp->sp_pwdp; } -#endif +#else + if (!strcmp(hash, "*")) { +#ifdef __OpenBSD__ + if (!(pw = getpwuid_shadow(getuid()))) + die("slock: getpwnam_shadow: cannot retrieve shadow entry. " + "Make sure to suid or sgid slock.\n"); + hash = 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 */ - /* 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; + return hash; } -#endif static void -#ifdef HAVE_BSD_AUTH -readpw(Display *dpy) -#else -readpw(Display *dpy, const char *pws) -#endif +readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens, + const char *hash) { - char buf[32], passwd[256]; - int num, screen; - unsigned int len, llen; + XRRScreenChangeNotifyEvent *rre; + char buf[32], passwd[256], *inputhash; + int num, screen, running, failure, oldc; + unsigned int len, color; KeySym ksym; XEvent ev; - len = llen = 0; - running = True; - - /* 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) { - buf[0] = 0; - num = XLookupString(&ev.xkey, buf, sizeof buf, &ksym, 0); - if(IsKeypadKey(ksym)) { - if(ksym == XK_KP_Enter) + len = 0; + running = 1; + failure = 0; + oldc = INIT; + + while (running && !XNextEvent(dpy, &ev)) { + running = !((time(NULL) - locktime < timetocancel) && (ev.type == MotionNotify)); + if (ev.type == KeyPress) { + explicit_bzero(&buf, sizeof(buf)); + 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) + 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)) + if (IsFunctionKey(ksym) || + IsKeypadKey(ksym) || + IsMiscFunctionKey(ksym) || + IsPFKey(ksym) || + IsPrivateKeypadKey(ksym)) continue; - switch(ksym) { + if (ev.xkey.state & ControlMask) { + switch (ksym) { + case XK_u: + ksym = XK_Escape; + break; + case XK_m: + ksym = XK_Return; + break; + case XK_j: + ksym = XK_Return; + break; + case XK_h: + ksym = XK_BackSpace; + break; + } + } + 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) + passwd[len] = '\0'; + errno = 0; + if (!(inputhash = crypt(passwd, hash))) + fprintf(stderr, "slock: crypt: %s\n", strerror(errno)); + else + running = !!strcmp(inputhash, hash); + if (running) { XBell(dpy, 100); + failure = 1; + } + explicit_bzero(&passwd, sizeof(passwd)); len = 0; break; case XK_Escape: + explicit_bzero(&passwd, sizeof(passwd)); len = 0; break; case XK_BackSpace: - if(len) - --len; + if (len) + passwd[--len] = '\0'; break; default: - if(num && !iscntrl((int) buf[0]) && (len + num < 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]); + 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); } - } else if(llen != 0 && len == 0) { - for(screen = 0; screen < nscreens; screen++) { - XSetWindowBackground(dpy, locks[screen]->win, locks[screen]->colors[0]); + oldc = color; + } + } else if (rr->active && ev.type == rr->evbase + RRScreenChangeNotify) { + rre = (XRRScreenChangeNotifyEvent*)&ev; + for (screen = 0; screen < nscreens; screen++) { + if (locks[screen]->win == rre->window) { + if (rre->rotation == RR_Rotate_90 || + rre->rotation == RR_Rotate_270) + XResizeWindow(dpy, locks[screen]->win, + rre->height, rre->width); + else + XResizeWindow(dpy, locks[screen]->win, + rre->width, rre->height); XClearWindow(dpy, locks[screen]->win); + break; } } - llen = len; + } else { + for (screen = 0; screen < nscreens; screen++) + XRaiseWindow(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); - 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) { +static struct lock * +lockscreen(Display *dpy, struct xrandr *rr, int screen) +{ char curs[] = {0, 0, 0, 0, 0, 0, 0, 0}; - unsigned int len; - Lock *lock; + int i, ptgrab, kbgrab; + struct lock *lock; XColor color, dummy; XSetWindowAttributes wa; Cursor invisible; - if(dpy == NULL || screen < 0) - return NULL; - - lock = malloc(sizeof(Lock)); - if(lock == NULL) + if (dpy == NULL || screen < 0 || !(lock = malloc(sizeof(struct 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 = 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; + 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); + 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); + + /* 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->active) + XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask); - running &= (len > 0); - if(!running) { - unlockscreen(dpy, lock); - lock = NULL; + XSelectInput(dpy, lock->root, SubstructureNotifyMask); + locktime = time(NULL); + return lock; + } + + /* retry on AlreadyGrabbed but fail on other errors */ + if ((ptgrab != AlreadyGrabbed && ptgrab != GrabSuccess) || + (kbgrab != AlreadyGrabbed && kbgrab != GrabSuccess)) + break; + + usleep(100000); } - else - XSelectInput(dpy, lock->root, SubstructureNotifyMask); - return lock; + /* 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) { - fprintf(stderr, "usage: slock [-v]\n"); - exit(EXIT_FAILURE); +usage(void) +{ + die("usage: slock [-v] [cmd [arg ...]]\n"); } int main(int argc, char **argv) { -#ifndef HAVE_BSD_AUTH - const char *pws; -#endif + struct xrandr rr; + struct lock **locks; + struct passwd *pwd; + struct group *grp; + uid_t duid; + gid_t dgid; + const char *hash; Display *dpy; - int screen; - - if((argc == 2) && !strcmp("-v", argv[1])) - die("slock-%s, © 2006-2014 slock engineers\n", VERSION); - else if(argc != 1) + int s, nlocks, nscreens; + CARD16 standby, suspend, off; + + 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 - if(!getpwuid(getuid())) - die("slock: no passwd entry for you\n"); - -#ifndef HAVE_BSD_AUTH - pws = getpw(); -#endif + hash = gethash(); + errno = 0; + if (!crypt("", hash)) + die("slock: crypt: %s\n", strerror(errno)); - if(!(dpy = XOpenDisplay(0))) + if (!(dpy = XOpenDisplay(NULL))) die("slock: cannot open display\n"); - /* Get the number of screens in display "dpy" and blank them all. */ + + /* 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.active = XRRQueryExtension(dpy, &rr.evbase, &rr.errbase); + + /* get number of screens in display "dpy" and blank them */ 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) + if (!(locks = calloc(nscreens, sizeof(struct lock *)))) + die("slock: out of memory\n"); + for (nlocks = 0, s = 0; s < nscreens; s++) { + if ((locks[s] = lockscreen(dpy, &rr, s)) != NULL) nlocks++; + else + break; } - XSync(dpy, False); + XSync(dpy, 0); - /* Did we actually manage to lock something? */ - if (nlocks == 0) { // nothing to protect - free(locks); - XCloseDisplay(dpy); + /* did we manage to lock everything? */ + if (nlocks != nscreens) return 1; - } - /* Everything is now blank. Now wait for the correct password. */ -#ifdef HAVE_BSD_AUTH - readpw(dpy); -#else - readpw(dpy, pws); -#endif + /* DPMS magic to disable the monitor */ + if (!DPMSCapable(dpy)) + die("slock: DPMSCapable failed\n"); + if (!DPMSEnable(dpy)) + die("slock: DPMSEnable failed\n"); + if (!DPMSGetTimeouts(dpy, &standby, &suspend, &off)) + die("slock: DPMSGetTimeouts failed\n"); + if (!standby || !suspend || !off) + die("slock: at least one DPMS variable is zero\n"); + if (!DPMSSetTimeouts(dpy, monitortime, monitortime, monitortime)) + die("slock: DPMSSetTimeouts failed\n"); + + XSync(dpy, 0); + + /* run post-lock command */ + if (argc > 0) { + switch (fork()) { + case -1: + 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); + } + } - /* Password ok, unlock everything and quit. */ - for(screen = 0; screen < nscreens; screen++) - unlockscreen(dpy, locks[screen]); + /* everything is now blank. Wait for the correct password */ + readpw(dpy, &rr, locks, nscreens, hash); - free(locks); - XCloseDisplay(dpy); + /* reset DPMS values to inital ones */ + DPMSSetTimeouts(dpy, standby, suspend, off); + XSync(dpy, 0); return 0; }