X-Git-Url: https://git.danieliu.xyz/?p=slock.git;a=blobdiff_plain;f=slock.c;h=df2d3c6beb2fa2af394bab7202aa0bc5493436b7;hp=0f4c3cc0bc7ea0c0bc2dbf8bb84327c93d46eb7b;hb=9dfe0ce531023bf63c0e518b07ee97cf0cac742a;hpb=dead0bb22e45a85a79f19d1378d263613e00db9e diff --git a/slock.c b/slock.c index 0f4c3cc..df2d3c6 100644 --- a/slock.c +++ b/slock.c @@ -1,126 +1,358 @@ -/* (C)opyright MMIV-MMV Anselm R. Garbe - * See LICENSE file for license details. - */ +/* See LICENSE file for license details. */ #define _XOPEN_SOURCE 500 - #if HAVE_SHADOW_H #include -#else -#include #endif #include +#include +#include +#include #include #include #include #include #include +#include #include #include #include -int -main(int argc, char **argv) { - char curs[] = {0, 0, 0, 0, 0, 0, 0, 0}; - char buf[32], passwd[256]; - int num, screen; -#if HAVE_SHADOW_H - struct spwd *sp; -#else - struct passwd *pw; +#if HAVE_BSD_AUTH +#include +#include #endif - unsigned int len; - Bool running = True; - Cursor invisible; - Display *dpy; - KeySym ksym; + +enum { + INIT, + INPUT, + FAILED, + NUMCOLS +}; + +#include "config.h" + +typedef struct { + int screen; + Window root, win; Pixmap pmap; - Window w; - XColor black, dummy; - XEvent ev; - XSetWindowAttributes wa; + unsigned long colors[NUMCOLS]; +} Lock; - if((argc > 1) && !strncmp(argv[1], "-v", 3)) { - fputs("slock-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout); - exit(EXIT_SUCCESS); - } - if(geteuid() != 0) { - fputs("slock: cannot retrieve password entry (make sure to suid slock)\n", stderr); - exit(EXIT_FAILURE); +static Lock **locks; +static int nscreens; +static Bool running = True; +static Bool failure = False; +static Bool rr; +static int rrevbase; +static int rrerrbase; + +static void +die(const char *errstr, ...) +{ + va_list ap; + + va_start(ap, errstr); + vfprintf(stderr, errstr, ap); + va_end(ap); + exit(1); +} + +#ifdef __linux__ +#include +#include + +static void +dontkillme(void) +{ + int fd; + int length; + char value[64]; + + fd = open("/proc/self/oom_score_adj", O_WRONLY); + if (fd < 0 && errno == ENOENT) + return; + + /* convert OOM_SCORE_ADJ_MIN to string for writing */ + length = snprintf(value, sizeof(value), "%d\n", OOM_SCORE_ADJ_MIN); + + /* bail on truncation */ + if (length >= sizeof(value)) + die("buffer too small\n"); + + if (fd < 0 || write(fd, value, length) != length || close(fd) != 0) + die("cannot disable the out-of-memory killer for this process\n"); +} +#endif + +#ifndef HAVE_BSD_AUTH +/* only run as root */ +static const char * +getpw(void) +{ + const char *rval; + struct passwd *pw; + + 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; + #if HAVE_SHADOW_H - sp = getspnam(getenv("USER")); - endspent(); -#else - pw = getpwuid(getuid()); - endpwent(); -#endif - if(!(dpy = XOpenDisplay(0))) { - fputs("slock: cannot open display\n", stderr); - exit(EXIT_FAILURE); + if (rval[0] == 'x' && rval[1] == '\0') { + struct spwd *sp; + if (!(sp = getspnam(getenv("USER")))) + die("slock: cannot retrieve shadow entry (make sure to suid or sgid slock)\n"); + rval = sp->sp_pwdp; } - screen = DefaultScreen(dpy); +#endif - /* init */ - passwd[0] = 0; - while(XGrabKeyboard(dpy, RootWindow(dpy, screen), True, GrabModeAsync, - GrabModeAsync, CurrentTime) != GrabSuccess) - usleep(1000); + /* 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 - wa.override_redirect = 1; - wa.background_pixel = BlackPixel(dpy, screen); - w = XCreateWindow(dpy, RootWindow(dpy, screen), 0, 0, - DisplayWidth(dpy, screen), DisplayHeight(dpy, screen), - 0, DefaultDepth(dpy, screen), CopyFromParent, - DefaultVisual(dpy, screen), CWOverrideRedirect | CWBackPixel, &wa); - - XAllocNamedColor(dpy, DefaultColormap(dpy, screen), "black", &black, &dummy); - pmap = XCreateBitmapFromData(dpy, w, curs, 8, 8); - invisible = XCreatePixmapCursor(dpy, pmap, pmap, &black, &black, 0, 0); - XDefineCursor(dpy, w, invisible); - XMapRaised(dpy, w); - XSync(dpy, False); +static void +#ifdef HAVE_BSD_AUTH +readpw(Display *dpy) +#else +readpw(Display *dpy, const char *pws) +#endif +{ + char buf[32], passwd[256]; + int num, screen; + unsigned int len, color; + KeySym ksym; + XEvent ev; + static int oldc = INIT; + + len = 0; + running = True; - /* main event loop */ - while(running && !XNextEvent(dpy, &ev)) - if(ev.type == KeyPress) { - len = strlen(passwd); + /* 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(IsFunctionKey(ksym) || IsKeypadKey(ksym) - || IsMiscFunctionKey(ksym) || IsPFKey(ksym) - || IsPrivateKeypadKey(ksym)) + 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; - switch(ksym) { + switch (ksym) { case XK_Return: -#if HAVE_SHADOW_H - if((running = strncmp(crypt(passwd, sp->sp_pwdp), sp->sp_pwdp, sizeof(passwd)))) + passwd[len] = 0; +#ifdef HAVE_BSD_AUTH + running = !auth_userokay(getlogin(), NULL, "auth-xlock", passwd); #else - if((running = strncmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd, sizeof(passwd)))) + running = !!strcmp(crypt(passwd, pws), pws); #endif + if (running) { XBell(dpy, 100); - passwd[0] = 0; + failure = True; + } + len = 0; break; case XK_Escape: - passwd[0] = 0; + len = 0; break; case XK_BackSpace: - if(len) - passwd[--len] = 0; + if (len) + --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; } + 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); + XFreeColors(dpy, DefaultColormap(dpy, lock->screen), lock->colors, NUMCOLS, 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; + int i; + Lock *lock; + XColor color, dummy; + XSetWindowAttributes wa; + Cursor invisible; + + if (!running || 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); + XMapRaised(dpy, lock->win); + if (rr) + XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask); + + /* Try to grab mouse pointer *and* keyboard, else fail the lock */ + for (len = 1000; len; len--) { + if (XGrabPointer(dpy, lock->root, False, ButtonPressMask | ButtonReleaseMask | PointerMotionMask, + GrabModeAsync, GrabModeAsync, None, invisible, CurrentTime) == GrabSuccess) + break; + usleep(1000); + } + if (!len) { + fprintf(stderr, "slock: unable to grab mouse pointer for screen %d\n", screen); + } else { + for (len = 1000; len; len--) { + if (XGrabKeyboard(dpy, lock->root, True, GrabModeAsync, GrabModeAsync, CurrentTime) == GrabSuccess) { + /* everything fine, we grabbed both inputs */ + XSelectInput(dpy, lock->root, SubstructureNotifyMask); + return lock; + } + usleep(1000); } - XFreePixmap(dpy, pmap); - XDestroyWindow(dpy, w); + fprintf(stderr, "slock: unable to grab keyboard for screen %d\n", screen); + } + /* grabbing one of the inputs failed */ + running = 0; + unlockscreen(dpy, lock); + return NULL; +} + +static void +usage(void) +{ + fprintf(stderr, "usage: slock [-v|POST_LOCK_CMD]\n"); + exit(1); +} + +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, © 2006-2015 slock engineers\n", VERSION); + + if ((argc == 2) && !strcmp("-h", argv[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"); + rr = XRRQueryExtension(dpy, &rrevbase, &rrerrbase); + /* Get the number of screens in display "dpy" and blank them all. */ + nscreens = ScreenCount(dpy); + if (!(locks = malloc(sizeof(Lock*) * nscreens))) + 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; + } + + if (argc >= 2 && fork() == 0) { + if (dpy) + close(ConnectionNumber(dpy)); + execvp(argv[1], argv+1); + die("slock: execvp %s failed: %s\n", argv[1], strerror(errno)); + } + + /* 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; }