1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
/* See LICENSE file for license details. */
#define _XOPEN_SOURCE 500
#if HAVE_SHADOW_H
#include <shadow.h>
#endif
#include <ctype.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/keysym.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/extensions/dpms.h>
#if HAVE_BSD_AUTH
#include <login_cap.h>
#include <bsd_auth.h>
#endif
static void
die(const char *errstr, ...) {
va_list ap;
va_start(ap, errstr);
vfprintf(stderr, errstr, ap);
va_end(ap);
exit(EXIT_FAILURE);
}
#ifndef HAVE_BSD_AUTH
static const char *
get_password() { /* only run as root */
const char *rval;
struct passwd *pw;
if(geteuid() != 0)
die("slock: cannot retrieve password entry (make sure to suid slock)\n");
pw = getpwuid(getuid());
endpwent();
rval = pw->pw_passwd;
#if HAVE_SHADOW_H
{
struct spwd *sp;
sp = getspnam(getenv("USER"));
endspent();
rval = sp->sp_pwdp;
}
#endif
/* drop privileges */
if(setgid(pw->pw_gid) < 0 || setuid(pw->pw_uid) < 0)
die("slock: cannot drop privileges\n");
return rval;
}
#endif
int
main(int argc, char **argv) {
char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
char buf[32], passwd[256];
int num, screen;
#ifndef HAVE_BSD_AUTH
const char *pws;
#endif
unsigned int len;
Bool running = True;
Cursor invisible;
Display *dpy;
KeySym ksym;
Pixmap pmap;
Window root, w;
XColor black, dummy;
XEvent ev;
XSetWindowAttributes wa;
if((argc == 2) && !strcmp("-v", argv[1]))
die("slock-"VERSION", © 2006-2008 Anselm R Garbe\n");
else if(argc != 1)
die("usage: slock [-v]\n");
#ifndef HAVE_BSD_AUTH
pws = get_password();
#endif
if(!(dpy = XOpenDisplay(0)))
die("slock: cannot open display\n");
screen = DefaultScreen(dpy);
root = RootWindow(dpy, screen);
/* init */
wa.override_redirect = 1;
wa.background_pixel = BlackPixel(dpy, screen);
w = XCreateWindow(dpy, root, 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);
for(len = 1000; len; len--) {
if(XGrabPointer(dpy, root, False, ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
GrabModeAsync, GrabModeAsync, None, invisible, CurrentTime) == GrabSuccess)
break;
usleep(1000);
}
if((running = running && (len > 0))) {
for(len = 1000; len; len--) {
if(XGrabKeyboard(dpy, root, True, GrabModeAsync, GrabModeAsync, CurrentTime)
== GrabSuccess)
break;
usleep(1000);
}
running = (len > 0);
}
len = 0;
XSync(dpy, False);
/* main event loop */
while(running && !XNextEvent(dpy, &ev)) {
if(len == 0 && DPMSCapable(dpy)) {
DPMSEnable(dpy);
DPMSForceLevel(dpy, DPMSModeOff);
}
if(ev.type == KeyPress) {
buf[0] = 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;
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 != 0)
XBell(dpy, 100);
len = 0;
break;
case XK_Escape:
len = 0;
break;
case XK_BackSpace:
if(len)
--len;
break;
default:
if(num && !iscntrl((int) buf[0]) && (len + num < sizeof passwd)) {
memcpy(passwd + len, buf, num);
len += num;
}
break;
}
}
}
XUngrabPointer(dpy, CurrentTime);
XFreePixmap(dpy, pmap);
XDestroyWindow(dpy, w);
XCloseDisplay(dpy);
return 0;
}
|
