inital commit
This commit is contained in:
Jakub
commit
b2eb85bfd3
24
LICENSE
Normal file
24
LICENSE
Normal file
@ -0,0 +1,24 @@
|
||||
MIT/X Consortium License
|
||||
|
||||
© 2015-2016 Markus Teich <markus.teich@stusta.mhn.de>
|
||||
© 2014 Dimitris Papastamos <sin@2f30.org>
|
||||
© 2006-2014 Anselm R Garbe <anselm@garbe.us>
|
||||
© 2014-2016 Laslo Hunhold <dev@frign.de>
|
||||
|
||||
Permission is hereby granted, free of charge, to any person obtaining a
|
||||
copy of this software and associated documentation files (the "Software"),
|
||||
to deal in the Software without restriction, including without limitation
|
||||
the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
||||
and/or sell copies of the Software, and to permit persons to whom the
|
||||
Software is furnished to do so, subject to the following conditions:
|
||||
|
||||
The above copyright notice and this permission notice shall be included in
|
||||
all copies or substantial portions of the Software.
|
||||
|
||||
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
||||
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
||||
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
||||
DEALINGS IN THE SOFTWARE.
|
||||
61
Makefile
Normal file
61
Makefile
Normal file
@ -0,0 +1,61 @@
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||||
# slock - simple screen locker
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# See LICENSE file for copyright and license details.
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include config.mk
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|
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SRC = slock.c ${COMPATSRC}
|
||||
OBJ = ${SRC:.c=.o}
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||||
|
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all: options slock
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||||
|
||||
options:
|
||||
@echo slock build options:
|
||||
@echo "CFLAGS = ${CFLAGS}"
|
||||
@echo "LDFLAGS = ${LDFLAGS}"
|
||||
@echo "CC = ${CC}"
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||||
|
||||
.c.o:
|
||||
@echo CC $<
|
||||
@${CC} -c ${CFLAGS} $<
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||||
|
||||
${OBJ}: config.h config.mk arg.h util.h
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||||
|
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config.h:
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@echo creating $@ from config.def.h
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@cp config.def.h $@
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|
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slock: ${OBJ}
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@echo CC -o $@
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@${CC} -o $@ ${OBJ} ${LDFLAGS}
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|
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clean:
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||||
@echo cleaning
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||||
@rm -f slock ${OBJ} slock-${VERSION}.tar.gz
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|
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dist: clean
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@echo creating dist tarball
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@mkdir -p slock-${VERSION}
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@cp -R LICENSE Makefile README slock.1 config.mk \
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${SRC} config.def.h arg.h util.h slock-${VERSION}
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@tar -cf slock-${VERSION}.tar slock-${VERSION}
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@gzip slock-${VERSION}.tar
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@rm -rf slock-${VERSION}
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install: all
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@echo installing executable file to ${DESTDIR}${PREFIX}/bin
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@mkdir -p ${DESTDIR}${PREFIX}/bin
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@cp -f slock ${DESTDIR}${PREFIX}/bin
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@chmod 755 ${DESTDIR}${PREFIX}/bin/slock
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@chmod u+s ${DESTDIR}${PREFIX}/bin/slock
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@echo installing manual page to ${DESTDIR}${MANPREFIX}/man1
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@mkdir -p ${DESTDIR}${MANPREFIX}/man1
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@sed "s/VERSION/${VERSION}/g" <slock.1 >${DESTDIR}${MANPREFIX}/man1/slock.1
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@chmod 644 ${DESTDIR}${MANPREFIX}/man1/slock.1
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uninstall:
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@echo removing executable file from ${DESTDIR}${PREFIX}/bin
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@rm -f ${DESTDIR}${PREFIX}/bin/slock
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@echo removing manual page from ${DESTDIR}${MANPREFIX}/man1
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@rm -f ${DESTDIR}${MANPREFIX}/man1/slock.1
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|
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.PHONY: all options clean dist install uninstall
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24
README
Normal file
24
README
Normal file
@ -0,0 +1,24 @@
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slock - simple screen locker
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============================
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simple screen locker utility for X.
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|
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Requirements
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||||
------------
|
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In order to build slock you need the Xlib header files.
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|
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|
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Installation
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------------
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Edit config.mk to match your local setup (slock is installed into
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the /usr/local namespace by default).
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|
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Afterwards enter the following command to build and install slock
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(if necessary as root):
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|
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make clean install
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|
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|
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Running slock
|
||||
-------------
|
||||
Simply invoke the 'slock' command. To get out of it, enter your password.
|
||||
65
arg.h
Normal file
65
arg.h
Normal file
@ -0,0 +1,65 @@
|
||||
/*
|
||||
* Copy me if you can.
|
||||
* by 20h
|
||||
*/
|
||||
|
||||
#ifndef ARG_H__
|
||||
#define ARG_H__
|
||||
|
||||
extern char *argv0;
|
||||
|
||||
/* use main(int argc, char *argv[]) */
|
||||
#define ARGBEGIN for (argv0 = *argv, argv++, argc--;\
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||||
argv[0] && argv[0][0] == '-'\
|
||||
&& argv[0][1];\
|
||||
argc--, argv++) {\
|
||||
char argc_;\
|
||||
char **argv_;\
|
||||
int brk_;\
|
||||
if (argv[0][1] == '-' && argv[0][2] == '\0') {\
|
||||
argv++;\
|
||||
argc--;\
|
||||
break;\
|
||||
}\
|
||||
for (brk_ = 0, argv[0]++, argv_ = argv;\
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||||
argv[0][0] && !brk_;\
|
||||
argv[0]++) {\
|
||||
if (argv_ != argv)\
|
||||
break;\
|
||||
argc_ = argv[0][0];\
|
||||
switch (argc_)
|
||||
|
||||
/* Handles obsolete -NUM syntax */
|
||||
#define ARGNUM case '0':\
|
||||
case '1':\
|
||||
case '2':\
|
||||
case '3':\
|
||||
case '4':\
|
||||
case '5':\
|
||||
case '6':\
|
||||
case '7':\
|
||||
case '8':\
|
||||
case '9'
|
||||
|
||||
#define ARGEND }\
|
||||
}
|
||||
|
||||
#define ARGC() argc_
|
||||
|
||||
#define ARGNUMF() (brk_ = 1, estrtonum(argv[0], 0, INT_MAX))
|
||||
|
||||
#define EARGF(x) ((argv[0][1] == '\0' && argv[1] == NULL)?\
|
||||
((x), abort(), (char *)0) :\
|
||||
(brk_ = 1, (argv[0][1] != '\0')?\
|
||||
(&argv[0][1]) :\
|
||||
(argc--, argv++, argv[0])))
|
||||
|
||||
#define ARGF() ((argv[0][1] == '\0' && argv[1] == NULL)?\
|
||||
(char *)0 :\
|
||||
(brk_ = 1, (argv[0][1] != '\0')?\
|
||||
(&argv[0][1]) :\
|
||||
(argc--, argv++, argv[0])))
|
||||
|
||||
#define LNGARG() &argv[0][0]
|
||||
|
||||
#endif
|
||||
12
config.def.h
Normal file
12
config.def.h
Normal file
@ -0,0 +1,12 @@
|
||||
/* user and group to drop privileges to */
|
||||
static const char *user = "nobody";
|
||||
static const char *group = "nogroup";
|
||||
|
||||
static const char *colorname[NUMCOLS] = {
|
||||
[INIT] = "black", /* after initialization */
|
||||
[INPUT] = "#005577", /* during input */
|
||||
[FAILED] = "#CC3333", /* wrong password */
|
||||
};
|
||||
|
||||
/* treat a cleared input like a wrong password (color) */
|
||||
static const int failonclear = 1;
|
||||
32
config.mk
Normal file
32
config.mk
Normal file
@ -0,0 +1,32 @@
|
||||
# slock version
|
||||
VERSION = 1.5
|
||||
|
||||
# Customize below to fit your system
|
||||
|
||||
# paths
|
||||
PREFIX = /usr/local
|
||||
MANPREFIX = ${PREFIX}/share/man
|
||||
|
||||
X11INC = /usr/X11R6/include
|
||||
X11LIB = /usr/X11R6/lib
|
||||
|
||||
# includes and libs
|
||||
INCS = -I. -I/usr/include -I${X11INC}
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||||
LIBS = -L/usr/lib -lc -lcrypt -L${X11LIB} -lX11 -lXext -lXrandr
|
||||
|
||||
# flags
|
||||
CPPFLAGS = -DVERSION=\"${VERSION}\" -D_DEFAULT_SOURCE -DHAVE_SHADOW_H
|
||||
CFLAGS = -std=c99 -pedantic -Wall -Os ${INCS} ${CPPFLAGS}
|
||||
LDFLAGS = -s ${LIBS}
|
||||
COMPATSRC = explicit_bzero.c
|
||||
|
||||
# On OpenBSD and Darwin remove -lcrypt from LIBS
|
||||
#LIBS = -L/usr/lib -lc -L${X11LIB} -lX11 -lXext -lXrandr
|
||||
# On *BSD remove -DHAVE_SHADOW_H from CPPFLAGS
|
||||
# On NetBSD add -D_NETBSD_SOURCE to CPPFLAGS
|
||||
#CPPFLAGS = -DVERSION=\"${VERSION}\" -D_BSD_SOURCE -D_NETBSD_SOURCE
|
||||
# On OpenBSD set COMPATSRC to empty
|
||||
#COMPATSRC =
|
||||
|
||||
# compiler and linker
|
||||
CC = cc
|
||||
19
explicit_bzero.c
Normal file
19
explicit_bzero.c
Normal file
@ -0,0 +1,19 @@
|
||||
/* $OpenBSD: explicit_bzero.c,v 1.3 2014/06/21 02:34:26 matthew Exp $ */
|
||||
/*
|
||||
* Public domain.
|
||||
* Written by Matthew Dempsky.
|
||||
*/
|
||||
|
||||
#include <string.h>
|
||||
|
||||
__attribute__((weak)) void
|
||||
__explicit_bzero_hook(void *buf, size_t len)
|
||||
{
|
||||
}
|
||||
|
||||
void
|
||||
explicit_bzero(void *buf, size_t len)
|
||||
{
|
||||
memset(buf, 0, len);
|
||||
__explicit_bzero_hook(buf, len);
|
||||
}
|
||||
39
slock.1
Normal file
39
slock.1
Normal file
@ -0,0 +1,39 @@
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||||
.Dd 2016-08-23
|
||||
.Dt SLOCK 1
|
||||
.Sh NAME
|
||||
.Nm slock
|
||||
.Nd simple X screen locker
|
||||
.Sh SYNOPSIS
|
||||
.Nm
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||||
.Op Fl v
|
||||
.Op Ar cmd Op Ar arg ...
|
||||
.Sh DESCRIPTION
|
||||
.Nm
|
||||
is a simple X screen locker. If provided,
|
||||
.Ar cmd Op Ar arg ...
|
||||
is executed after the screen has been locked.
|
||||
.Sh OPTIONS
|
||||
.Bl -tag -width Ds
|
||||
.It Fl v
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||||
Print version information to stdout and exit.
|
||||
.El
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||||
.Sh SECURITY CONSIDERATIONS
|
||||
To make sure a locked screen can not be bypassed by switching VTs
|
||||
or killing the X server with Ctrl+Alt+Backspace, it is recommended
|
||||
to disable both in
|
||||
.Xr xorg.conf 5
|
||||
for maximum security:
|
||||
.Bd -literal -offset left
|
||||
Section "ServerFlags"
|
||||
Option "DontVTSwitch" "True"
|
||||
Option "DontZap" "True"
|
||||
EndSection
|
||||
.Ed
|
||||
.Sh EXAMPLES
|
||||
$
|
||||
.Nm
|
||||
/usr/sbin/s2ram
|
||||
.Sh CUSTOMIZATION
|
||||
.Nm
|
||||
can be customized by creating a custom config.h from config.def.h and
|
||||
(re)compiling the source code. This keeps it fast, secure and simple.
|
||||
395
slock.c
Normal file
395
slock.c
Normal file
@ -0,0 +1,395 @@
|
||||
/* 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>
|
||||
|
||||
#include "arg.h"
|
||||
#include "util.h"
|
||||
|
||||
char *argv0;
|
||||
|
||||
enum {
|
||||
INIT,
|
||||
INPUT,
|
||||
FAILED,
|
||||
NUMCOLS
|
||||
};
|
||||
|
||||
struct lock {
|
||||
int screen;
|
||||
Window root, win;
|
||||
Pixmap pmap;
|
||||
unsigned long colors[NUMCOLS];
|
||||
};
|
||||
|
||||
struct xrandr {
|
||||
int active;
|
||||
int evbase;
|
||||
int errbase;
|
||||
};
|
||||
|
||||
#include "config.h"
|
||||
|
||||
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 <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));
|
||||
}
|
||||
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
|
||||
|
||||
static const char *
|
||||
gethash(void)
|
||||
{
|
||||
const char *hash;
|
||||
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");
|
||||
}
|
||||
hash = pw->pw_passwd;
|
||||
|
||||
#if HAVE_SHADOW_H
|
||||
if (!strcmp(hash, "x")) {
|
||||
struct spwd *sp;
|
||||
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;
|
||||
}
|
||||
#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 */
|
||||
|
||||
return hash;
|
||||
}
|
||||
|
||||
static void
|
||||
readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
|
||||
const char *hash)
|
||||
{
|
||||
XRRScreenChangeNotifyEvent *rre;
|
||||
char buf[32], passwd[256], *inputhash;
|
||||
int num, screen, running, failure, oldc;
|
||||
unsigned int len, color;
|
||||
KeySym ksym;
|
||||
XEvent ev;
|
||||
|
||||
len = 0;
|
||||
running = 1;
|
||||
failure = 0;
|
||||
oldc = INIT;
|
||||
|
||||
while (running && !XNextEvent(dpy, &ev)) {
|
||||
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)
|
||||
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';
|
||||
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)
|
||||
passwd[--len] = '\0';
|
||||
break;
|
||||
default:
|
||||
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->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;
|
||||
}
|
||||
}
|
||||
} else {
|
||||
for (screen = 0; screen < nscreens; screen++)
|
||||
XRaiseWindow(dpy, locks[screen]->win);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static struct lock *
|
||||
lockscreen(Display *dpy, struct xrandr *rr, int screen)
|
||||
{
|
||||
char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
|
||||
int i, ptgrab, kbgrab;
|
||||
struct lock *lock;
|
||||
XColor color, dummy;
|
||||
XSetWindowAttributes wa;
|
||||
Cursor invisible;
|
||||
|
||||
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 = 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->active)
|
||||
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 xrandr rr;
|
||||
struct lock **locks;
|
||||
struct passwd *pwd;
|
||||
struct group *grp;
|
||||
uid_t duid;
|
||||
gid_t dgid;
|
||||
const char *hash;
|
||||
Display *dpy;
|
||||
int s, nlocks, nscreens;
|
||||
|
||||
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
|
||||
|
||||
hash = gethash();
|
||||
errno = 0;
|
||||
if (!crypt("", hash))
|
||||
die("slock: crypt: %s\n", strerror(errno));
|
||||
|
||||
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.active = XRRQueryExtension(dpy, &rr.evbase, &rr.errbase);
|
||||
|
||||
/* get number of screens in display "dpy" and blank them */
|
||||
nscreens = ScreenCount(dpy);
|
||||
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, 0);
|
||||
|
||||
/* did we manage to lock everything? */
|
||||
if (nlocks != nscreens)
|
||||
return 1;
|
||||
|
||||
/* 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);
|
||||
}
|
||||
}
|
||||
|
||||
/* everything is now blank. Wait for the correct password */
|
||||
readpw(dpy, &rr, locks, nscreens, hash);
|
||||
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user