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/* See LICENSE file for license details. */
#define _XOPEN_SOURCE 700
#include <X11/Xlib.h>
#include <X11/Xft/Xft.h>
#include <X11/keysym.h>
#include <unistd.h>
#include <pwd.h>
#include <grp.h>
#include <shadow.h>
#include <crypt.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include "../accent.h"
#include "config.h"
static ColorShm *accentshm;
static char accentcol[8] = "#005577";
static void
die(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
exit(1);
}
static void
updateaccent(void)
{
if (!readaccent(&accentshm, accentcol))
memcpy(accentcol, "#005577", 8);
}
static const char *
gethash(const char *user)
{
struct passwd *pw;
const char *hash;
if (!(pw = getpwnam(user)))
return NULL;
hash = pw->pw_passwd;
#if HAVE_SHADOW_H
if (!strcmp(hash, "x")) {
struct spwd *sp;
if (!(sp = getspnam(user)))
return NULL;
hash = sp->sp_pwdp;
}
#endif
return hash;
}
static int
auth(const char *user, const char *pass)
{
const char *hash = gethash(user);
char *cryptpw;
if (!hash)
return 0;
if (!(cryptpw = crypt(pass, hash)))
return 0;
return !strcmp(cryptpw, hash);
}
static void
runsession(const char *user, const char *pass)
{
struct passwd *pw;
if (!auth(user, pass))
return;
if (!(pw = getpwnam(user)))
return;
if (initgroups(user, pw->pw_gid) < 0)
die("slogin: initgroups failed\n");
if (setgid(pw->pw_gid) < 0)
die("slogin: setgid failed\n");
if (setuid(pw->pw_uid) < 0)
die("slogin: setuid failed\n");
setenv("HOME", pw->pw_dir, 1);
chdir(pw->pw_dir);
setsid();
execvp(logincmd[0], (char *const *)logincmd);
die("slogin: exec failed\n");
}
static void
drawscreen(Display *dpy, Window win, XftDraw *draw, XftFont *font,
XftColor *fg, XftColor *accent,
const char *user, const char *pass, int stage)
{
char buf[256];
int width = DisplayWidth(dpy, DefaultScreen(dpy));
int height = DisplayHeight(dpy, DefaultScreen(dpy));
int w = 400, h = 100;
int x = (width - w)/2;
int y = (height - h)/2;
GC gc = DefaultGC(dpy, DefaultScreen(dpy));
XClearWindow(dpy, win);
XSetForeground(dpy, gc, accent->pixel);
XDrawRectangle(dpy, win, gc, x, y, w, h);
if (stage == 0)
snprintf(buf, sizeof buf, "login: %s", user);
else {
char stars[sizeof buf];
size_t i, len = strlen(pass);
for (i = 0; i < len && i < sizeof stars - 1; i++)
stars[i] = '*';
stars[i] = '\0';
snprintf(buf, sizeof buf, "password: %s", stars);
}
XftDrawStringUtf8(draw, fg, font, x + 20, y + h/2 + font->ascent/2,
(XftChar8 *)buf, strlen(buf));
XFlush(dpy);
}
int
main(void)
{
Display *dpy;
int scr;
Window root, win;
XEvent ev;
XftDraw *xdraw;
XftFont *font;
XftColor xfg, xbg, xaccent;
char user[64] = "", pass[64] = "";
int stage = 0;
KeySym ksym;
char buf[32];
int len;
updateaccent();
if (!(dpy = XOpenDisplay(NULL)))
die("slogin: cannot open display\n");
scr = DefaultScreen(dpy);
root = RootWindow(dpy, scr);
win = XCreateSimpleWindow(dpy, root, 0, 0,
DisplayWidth(dpy, scr), DisplayHeight(dpy, scr),
0, BlackPixel(dpy, scr), BlackPixel(dpy, scr));
XSelectInput(dpy, win, KeyPressMask | ExposureMask);
XMapRaised(dpy, win);
font = XftFontOpenName(dpy, scr, fontname);
if (!font)
die("slogin: cannot load font\n");
xdraw = XftDrawCreate(dpy, win, DefaultVisual(dpy, scr), DefaultColormap(dpy, scr));
XftColorAllocName(dpy, DefaultVisual(dpy, scr), DefaultColormap(dpy, scr), fgcolor, &xfg);
XftColorAllocName(dpy, DefaultVisual(dpy, scr), DefaultColormap(dpy, scr), bgcolor, &xbg);
XftColorAllocName(dpy, DefaultVisual(dpy, scr), DefaultColormap(dpy, scr), accentcol, &xaccent);
XSetWindowBackground(dpy, win, xbg.pixel);
XClearWindow(dpy, win);
for (;;) {
XNextEvent(dpy, &ev);
if (ev.type == Expose) {
drawscreen(dpy, win, xdraw, font, &xfg, &xaccent,
user, pass, stage);
} else if (ev.type == KeyPress) {
len = XLookupString(&ev.xkey, buf, sizeof buf, &ksym, NULL);
if (ksym == XK_Return) {
if (stage == 0)
stage = 1;
else {
runsession(user, pass);
stage = 0;
user[0] = pass[0] = '\0';
}
} else if (ksym == XK_BackSpace) {
if (stage == 0 && strlen(user) > 0)
user[strlen(user)-1] = '\0';
else if (stage == 1 && strlen(pass) > 0)
pass[strlen(pass)-1] = '\0';
} else if (len && buf[0] >= ' ' && buf[0] <= '~') {
if (stage == 0 && strlen(user) + len < sizeof user) {
strncat(user, buf, len);
user[strlen(user)] = '\0';
} else if (stage == 1 && strlen(pass) + len < sizeof pass) {
strncat(pass, buf, len);
pass[strlen(pass)] = '\0';
}
}
drawscreen(dpy, win, xdraw, font, &xfg, &xaccent,
user, pass, stage);
}
}
}
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