slock.c (13845B)
1 /* See LICENSE file for license details. */ 2 #define _XOPEN_SOURCE 500 3 #define LENGTH(X) (sizeof X / sizeof X[0]) 4 #if HAVE_SHADOW_H 5 #include <shadow.h> 6 #endif 7 8 #include <ctype.h> 9 #include <errno.h> 10 #include <grp.h> 11 #include <pwd.h> 12 #include <stdarg.h> 13 #include <stdlib.h> 14 #include <stdio.h> 15 #include <string.h> 16 #include <unistd.h> 17 #include <spawn.h> 18 #include <sys/types.h> 19 #include <X11/extensions/Xrandr.h> 20 #ifdef XINERAMA 21 #include <X11/extensions/Xinerama.h> 22 #endif 23 #include <X11/keysym.h> 24 #include <X11/Xlib.h> 25 #include <X11/Xutil.h> 26 #include <Imlib2.h> 27 28 /*POSIX threading for auto-timeout*/ 29 #include <pthread.h> 30 #include <time.h> 31 32 #include "arg.h" 33 #include "util.h" 34 35 char *argv0; 36 37 enum { 38 BACKGROUND, 39 INIT, 40 INPUT, 41 FAILED, 42 NUMCOLS 43 }; 44 45 #include "config.h" 46 47 struct lock { 48 int screen; 49 Window root, win; 50 Pixmap pmap; 51 Pixmap bgmap; 52 unsigned long colors[NUMCOLS]; 53 unsigned int x, y; 54 unsigned int xoff, yoff, mw, mh; 55 Drawable drawable; 56 GC gc; 57 XRectangle rectangles[LENGTH(rectangles)]; 58 }; 59 60 struct xrandr { 61 int active; 62 int evbase; 63 int errbase; 64 }; 65 66 Imlib_Image image; 67 68 static void 69 die(const char *errstr, ...) 70 { 71 va_list ap; 72 73 va_start(ap, errstr); 74 vfprintf(stderr, errstr, ap); 75 va_end(ap); 76 exit(1); 77 } 78 79 #ifdef __linux__ 80 #include <fcntl.h> 81 #include <linux/oom.h> 82 83 static void 84 dontkillme(void) 85 { 86 FILE *f; 87 const char oomfile[] = "/proc/self/oom_score_adj"; 88 89 if (!(f = fopen(oomfile, "w"))) { 90 if (errno == ENOENT) 91 return; 92 die("slock: fopen %s: %s\n", oomfile, strerror(errno)); 93 } 94 fprintf(f, "%d", OOM_SCORE_ADJ_MIN); 95 if (fclose(f)) { 96 if (errno == EACCES) 97 die("slock: unable to disable OOM killer. " 98 "Make sure to suid or sgid slock.\n"); 99 else 100 die("slock: fclose %s: %s\n", oomfile, strerror(errno)); 101 } 102 } 103 #endif 104 105 static const char * 106 gethash(void) 107 { 108 const char *hash; 109 struct passwd *pw; 110 111 /* Check if the current user has a password entry */ 112 errno = 0; 113 if (!(pw = getpwuid(getuid()))) { 114 if (errno) 115 die("slock: getpwuid: %s\n", strerror(errno)); 116 else 117 die("slock: cannot retrieve password entry\n"); 118 } 119 hash = pw->pw_passwd; 120 121 #if HAVE_SHADOW_H 122 if (!strcmp(hash, "x")) { 123 struct spwd *sp; 124 if (!(sp = getspnam(pw->pw_name))) 125 die("slock: getspnam: cannot retrieve shadow entry. " 126 "Make sure to suid or sgid slock.\n"); 127 hash = sp->sp_pwdp; 128 } 129 #else 130 if (!strcmp(hash, "*")) { 131 #ifdef __OpenBSD__ 132 if (!(pw = getpwuid_shadow(getuid()))) 133 die("slock: getpwnam_shadow: cannot retrieve shadow entry. " 134 "Make sure to suid or sgid slock.\n"); 135 hash = pw->pw_passwd; 136 #else 137 die("slock: getpwuid: cannot retrieve shadow entry. " 138 "Make sure to suid or sgid slock.\n"); 139 #endif /* __OpenBSD__ */ 140 } 141 #endif /* HAVE_SHADOW_H */ 142 143 return hash; 144 } 145 146 static void 147 resizerectangles(struct lock *lock) 148 { 149 int i; 150 151 for (i = 0; i < LENGTH(rectangles); i++){ 152 lock->rectangles[i].x = (rectangles[i].x * logosize) 153 + lock->xoff + ((lock->mw) / 2) - (logow / 2 * logosize); 154 lock->rectangles[i].y = (rectangles[i].y * logosize) 155 + lock->yoff + ((lock->mh) / 2) - (logoh / 2 * logosize); 156 lock->rectangles[i].width = rectangles[i].width * logosize; 157 lock->rectangles[i].height = rectangles[i].height * logosize; 158 } 159 } 160 161 static void 162 drawlogo(Display *dpy, struct lock *lock, int color) 163 { 164 XSetForeground(dpy, lock->gc, lock->colors[color]); 165 XFillRectangles(dpy, lock->win, lock->gc, lock->rectangles, LENGTH(rectangles)); 166 XSync(dpy, False); 167 } 168 169 static void 170 readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens, 171 const char *hash) 172 { 173 XRRScreenChangeNotifyEvent *rre; 174 char buf[32], passwd[256], *inputhash; 175 int num, screen, running, failure, oldc; 176 unsigned int len, color; 177 KeySym ksym; 178 XEvent ev; 179 180 len = 0; 181 running = 1; 182 failure = 0; 183 oldc = INIT; 184 185 while (running && !XNextEvent(dpy, &ev)) { 186 if (ev.type == KeyPress) { 187 explicit_bzero(&buf, sizeof(buf)); 188 num = XLookupString(&ev.xkey, buf, sizeof(buf), &ksym, 0); 189 if (IsKeypadKey(ksym)) { 190 if (ksym == XK_KP_Enter) 191 ksym = XK_Return; 192 else if (ksym >= XK_KP_0 && ksym <= XK_KP_9) 193 ksym = (ksym - XK_KP_0) + XK_0; 194 } 195 if (IsFunctionKey(ksym) || 196 IsKeypadKey(ksym) || 197 IsMiscFunctionKey(ksym) || 198 IsPFKey(ksym) || 199 IsPrivateKeypadKey(ksym)) 200 continue; 201 switch (ksym) { 202 case XK_Return: 203 passwd[len] = '\0'; 204 errno = 0; 205 if (!(inputhash = crypt(passwd, hash))) 206 fprintf(stderr, "slock: crypt: %s\n", strerror(errno)); 207 else 208 running = !!strcmp(inputhash, hash); 209 if (running) { 210 XBell(dpy, 100); 211 failure = 1; 212 } 213 explicit_bzero(&passwd, sizeof(passwd)); 214 len = 0; 215 break; 216 case XK_Escape: 217 explicit_bzero(&passwd, sizeof(passwd)); 218 len = 0; 219 break; 220 case XK_BackSpace: 221 if (len) 222 passwd[--len] = '\0'; 223 break; 224 default: 225 if (controlkeyclear && iscntrl((int)buf[0])) 226 continue; 227 if (num && (len + num < sizeof(passwd))) { 228 memcpy(passwd + len, buf, num); 229 len += num; 230 } else if (buf[0] == '\025') { /* ctrl-u clears input */ 231 explicit_bzero(&passwd, sizeof(passwd)); 232 len = 0; 233 } 234 break; 235 } 236 color = len ? INPUT : ((failure || failonclear) ? FAILED : INIT); 237 if (running && oldc != color) { 238 for (screen = 0; screen < nscreens; screen++) { 239 if(locks[screen]->bgmap) 240 XSetWindowBackgroundPixmap(dpy, locks[screen]->win, locks[screen]->bgmap); 241 else 242 XSetWindowBackground(dpy, locks[screen]->win, locks[screen]->colors[0]); 243 //XClearWindow(dpy, locks[screen]->win); 244 drawlogo(dpy, locks[screen], color); 245 } 246 oldc = color; 247 } 248 } else if (rr->active && ev.type == rr->evbase + RRScreenChangeNotify) { 249 rre = (XRRScreenChangeNotifyEvent*)&ev; 250 for (screen = 0; screen < nscreens; screen++) { 251 if (locks[screen]->win == rre->window) { 252 if (rre->rotation == RR_Rotate_90 || 253 rre->rotation == RR_Rotate_270) 254 XResizeWindow(dpy, locks[screen]->win, 255 rre->height, rre->width); 256 else 257 XResizeWindow(dpy, locks[screen]->win, 258 rre->width, rre->height); 259 XClearWindow(dpy, locks[screen]->win); 260 break; 261 } 262 } 263 } else { 264 for (screen = 0; screen < nscreens; screen++) 265 XRaiseWindow(dpy, locks[screen]->win); 266 } 267 } 268 } 269 270 void *timeoutCommand(void *args) 271 { 272 int runflag=0; 273 while (!runonce || !runflag) 274 { 275 sleep(timeoffset); 276 runflag = 1; 277 system(command); 278 } 279 return args; 280 } 281 282 static struct lock * 283 lockscreen(Display *dpy, struct xrandr *rr, int screen) 284 { 285 char curs[] = {0, 0, 0, 0, 0, 0, 0, 0}; 286 int i, ptgrab, kbgrab; 287 struct lock *lock; 288 XColor color, dummy; 289 XSetWindowAttributes wa; 290 Cursor invisible; 291 #ifdef XINERAMA 292 XineramaScreenInfo *info; 293 int n; 294 #endif 295 296 if (dpy == NULL || screen < 0 || !(lock = malloc(sizeof(struct lock)))) 297 return NULL; 298 299 lock->screen = screen; 300 lock->root = RootWindow(dpy, lock->screen); 301 302 if(image) 303 { 304 lock->bgmap = XCreatePixmap(dpy, lock->root, DisplayWidth(dpy, lock->screen), DisplayHeight(dpy, lock->screen), DefaultDepth(dpy, lock->screen)); 305 imlib_context_set_image(image); 306 imlib_context_set_display(dpy); 307 imlib_context_set_visual(DefaultVisual(dpy, lock->screen)); 308 imlib_context_set_colormap(DefaultColormap(dpy, lock->screen)); 309 imlib_context_set_drawable(lock->bgmap); 310 imlib_render_image_on_drawable(0, 0); 311 imlib_free_image(); 312 } 313 for (i = 0; i < NUMCOLS; i++) { 314 XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen), 315 colorname[i], &color, &dummy); 316 lock->colors[i] = color.pixel; 317 } 318 319 lock->x = DisplayWidth(dpy, lock->screen); 320 lock->y = DisplayHeight(dpy, lock->screen); 321 #ifdef XINERAMA 322 if ((info = XineramaQueryScreens(dpy, &n))) { 323 lock->xoff = info[0].x_org; 324 lock->yoff = info[0].y_org; 325 lock->mw = info[0].width; 326 lock->mh = info[0].height; 327 } else 328 #endif 329 { 330 lock->xoff = lock->yoff = 0; 331 lock->mw = lock->x; 332 lock->mh = lock->y; 333 } 334 lock->drawable = XCreatePixmap(dpy, lock->root, 335 lock->x, lock->y, DefaultDepth(dpy, screen)); 336 lock->gc = XCreateGC(dpy, lock->root, 0, NULL); 337 XSetLineAttributes(dpy, lock->gc, 1, LineSolid, CapButt, JoinMiter); 338 339 /* init */ 340 wa.override_redirect = 1; 341 wa.background_pixel = lock->colors[BACKGROUND]; 342 lock->win = XCreateWindow(dpy, lock->root, 0, 0, 343 lock->x, lock->y, 344 0, DefaultDepth(dpy, lock->screen), 345 CopyFromParent, 346 DefaultVisual(dpy, lock->screen), 347 CWOverrideRedirect | CWBackPixel, &wa); 348 if(lock->bgmap) 349 XSetWindowBackgroundPixmap(dpy, lock->win, lock->bgmap); 350 lock->pmap = XCreateBitmapFromData(dpy, lock->win, curs, 8, 8); 351 invisible = XCreatePixmapCursor(dpy, lock->pmap, lock->pmap, 352 &color, &color, 0, 0); 353 XDefineCursor(dpy, lock->win, invisible); 354 355 resizerectangles(lock); 356 357 /* Try to grab mouse pointer *and* keyboard for 600ms, else fail the lock */ 358 for (i = 0, ptgrab = kbgrab = -1; i < 6; i++) { 359 if (ptgrab != GrabSuccess) { 360 ptgrab = XGrabPointer(dpy, lock->root, False, 361 ButtonPressMask | ButtonReleaseMask | 362 PointerMotionMask, GrabModeAsync, 363 GrabModeAsync, None, invisible, CurrentTime); 364 } 365 if (kbgrab != GrabSuccess) { 366 kbgrab = XGrabKeyboard(dpy, lock->root, True, 367 GrabModeAsync, GrabModeAsync, CurrentTime); 368 } 369 370 /* input is grabbed: we can lock the screen */ 371 if (ptgrab == GrabSuccess && kbgrab == GrabSuccess) { 372 XMapRaised(dpy, lock->win); 373 if (rr->active) 374 XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask); 375 376 XSelectInput(dpy, lock->root, SubstructureNotifyMask); 377 drawlogo(dpy, lock, INIT); 378 return lock; 379 } 380 381 /* retry on AlreadyGrabbed but fail on other errors */ 382 if ((ptgrab != AlreadyGrabbed && ptgrab != GrabSuccess) || 383 (kbgrab != AlreadyGrabbed && kbgrab != GrabSuccess)) 384 break; 385 386 usleep(100000); 387 } 388 389 /* we couldn't grab all input: fail out */ 390 if (ptgrab != GrabSuccess) 391 fprintf(stderr, "slock: unable to grab mouse pointer for screen %d\n", 392 screen); 393 if (kbgrab != GrabSuccess) 394 fprintf(stderr, "slock: unable to grab keyboard for screen %d\n", 395 screen); 396 return NULL; 397 } 398 399 static void 400 usage(void) 401 { 402 die("usage: slock [-v] [cmd [arg ...]]\n"); 403 } 404 405 int 406 main(int argc, char **argv) { 407 struct xrandr rr; 408 struct lock **locks; 409 struct passwd *pwd; 410 struct group *grp; 411 uid_t duid; 412 gid_t dgid; 413 const char *hash; 414 Display *dpy; 415 int s, nlocks, nscreens; 416 417 ARGBEGIN { 418 case 'v': 419 puts("slock-"VERSION); 420 return 0; 421 default: 422 usage(); 423 } ARGEND 424 425 /* validate drop-user and -group */ 426 errno = 0; 427 if (!(pwd = getpwnam(user))) 428 die("slock: getpwnam %s: %s\n", user, 429 errno ? strerror(errno) : "user entry not found"); 430 duid = pwd->pw_uid; 431 errno = 0; 432 if (!(grp = getgrnam(group))) 433 die("slock: getgrnam %s: %s\n", group, 434 errno ? strerror(errno) : "group entry not found"); 435 dgid = grp->gr_gid; 436 437 #ifdef __linux__ 438 dontkillme(); 439 #endif 440 441 hash = gethash(); 442 errno = 0; 443 if (!crypt("", hash)) 444 die("slock: crypt: %s\n", strerror(errno)); 445 446 if (!(dpy = XOpenDisplay(NULL))) 447 die("slock: cannot open display\n"); 448 449 /* drop privileges */ 450 if (setgroups(0, NULL) < 0) 451 die("slock: setgroups: %s\n", strerror(errno)); 452 if (setgid(dgid) < 0) 453 die("slock: setgid: %s\n", strerror(errno)); 454 if (setuid(duid) < 0) 455 die("slock: setuid: %s\n", strerror(errno)); 456 457 /*Create screenshot Image*/ 458 Screen *scr = ScreenOfDisplay(dpy, DefaultScreen(dpy)); 459 image = imlib_create_image(scr->width,scr->height); 460 imlib_context_set_image(image); 461 imlib_context_set_display(dpy); 462 imlib_context_set_visual(DefaultVisual(dpy,0)); 463 imlib_context_set_drawable(RootWindow(dpy,XScreenNumberOfScreen(scr))); 464 imlib_copy_drawable_to_image(0,0,0,scr->width,scr->height,0,0,1); 465 466 #ifdef BLUR 467 468 /*Blur function*/ 469 imlib_image_blur(blurRadius); 470 #endif // BLUR 471 472 #ifdef PIXELATION 473 /*Pixelation*/ 474 int width = scr->width; 475 int height = scr->height; 476 477 for(int y = 0; y < height; y += pixelSize) 478 { 479 for(int x = 0; x < width; x += pixelSize) 480 { 481 int red = 0; 482 int green = 0; 483 int blue = 0; 484 485 Imlib_Color pixel; 486 Imlib_Color* pp; 487 pp = &pixel; 488 for(int j = 0; j < pixelSize && j < height; j++) 489 { 490 for(int i = 0; i < pixelSize && i < width; i++) 491 { 492 imlib_image_query_pixel(x+i,y+j,pp); 493 red += pixel.red; 494 green += pixel.green; 495 blue += pixel.blue; 496 } 497 } 498 red /= (pixelSize*pixelSize); 499 green /= (pixelSize*pixelSize); 500 blue /= (pixelSize*pixelSize); 501 imlib_context_set_color(red,green,blue,pixel.alpha); 502 imlib_image_fill_rectangle(x,y,pixelSize,pixelSize); 503 red = 0; 504 green = 0; 505 blue = 0; 506 } 507 } 508 509 510 #endif 511 /* check for Xrandr support */ 512 rr.active = XRRQueryExtension(dpy, &rr.evbase, &rr.errbase); 513 514 /* get number of screens in display "dpy" and blank them */ 515 nscreens = ScreenCount(dpy); 516 if (!(locks = calloc(nscreens, sizeof(struct lock *)))) 517 die("slock: out of memory\n"); 518 for (nlocks = 0, s = 0; s < nscreens; s++) { 519 if ((locks[s] = lockscreen(dpy, &rr, s)) != NULL) 520 nlocks++; 521 else 522 break; 523 } 524 XSync(dpy, 0); 525 526 /* did we manage to lock everything? */ 527 if (nlocks != nscreens) 528 return 1; 529 530 /* run post-lock command */ 531 if (argc > 0) { 532 pid_t pid; 533 extern char **environ; 534 int err = posix_spawnp(&pid, argv[0], NULL, NULL, argv, environ); 535 if (err) { 536 die("slock: failed to execute post-lock command: %s: %s\n", 537 argv[0], strerror(err)); 538 } 539 } 540 541 /*Start the auto-timeout command in its own thread*/ 542 pthread_t thread_id; 543 pthread_create(&thread_id, NULL, timeoutCommand, NULL); 544 545 /* everything is now blank. Wait for the correct password */ 546 readpw(dpy, &rr, locks, nscreens, hash); 547 548 for (nlocks = 0, s = 0; s < nscreens; s++) { 549 XFreePixmap(dpy, locks[s]->drawable); 550 XFreeGC(dpy, locks[s]->gc); 551 } 552 553 XSync(dpy, 0); 554 XCloseDisplay(dpy); 555 return 0; 556 } 557