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#define _XOPEN_SOURCE 700
#include <X11/Xlib.h>
#include <X11/keysym.h>
#include <ctype.h>
#include <grp.h>
#include <pwd.h>
#if HAVE_SHADOW_H
#include <shadow.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <crypt.h>
#include "../accent.h"
#define WIDTH 400
#define HEIGHT 100
static ColorShm *accentshm;
static char accentcol[8] = "#005577";
static int
auth(const char *user, const char *pass)
{
struct passwd *pw = getpwnam(user);
const char *hash;
if (!pw)
return 0;
#if HAVE_SHADOW_H
struct spwd *sp = getspnam(user);
hash = sp ? sp->sp_pwdp : pw->pw_passwd;
#else
hash = pw->pw_passwd;
#endif
if (!hash || hash[0] == '!' || hash[0] == '*')
return 0;
return strcmp(crypt(pass, hash), hash) == 0;
}
static void
draw(Display *dpy, Window win, GC gc, const char *prompt,
const char *input, int hidden)
{
XClearWindow(dpy, win);
XDrawString(dpy, win, gc, 10, 25, prompt, strlen(prompt));
if (input && *input) {
char buf[128];
const char *show = input;
if (hidden) {
size_t n = strlen(input);
if (n >= sizeof buf)
n = sizeof buf - 1;
memset(buf, '*', n);
buf[n] = '\0';
show = buf;
}
XDrawString(dpy, win, gc, 10, 50, show, strlen(show));
}
XFlush(dpy);
}
static void
updateaccent(Display *dpy, Colormap cmap, GC gc, Window win)
{
XColor col;
readaccent(&accentshm, accentcol);
XParseColor(dpy, cmap, accentcol, &col);
XAllocColor(dpy, cmap, &col);
XSetForeground(dpy, gc, col.pixel);
XSetWindowBorder(dpy, win, col.pixel);
}
int
main(void)
{
Display *dpy;
Window win;
XEvent ev;
GC gc;
XFontStruct *font;
int screen;
Colormap cmap;
if (!(dpy = XOpenDisplay(NULL))) {
fprintf(stderr, "slogin: cannot open display\n");
return 1;
}
screen = DefaultScreen(dpy);
cmap = DefaultColormap(dpy, screen);
win = XCreateSimpleWindow(dpy, RootWindow(dpy, screen),
DisplayWidth(dpy, screen)/2 - WIDTH/2,
DisplayHeight(dpy, screen)/2 - HEIGHT/2,
WIDTH, HEIGHT, 2, BlackPixel(dpy, screen), BlackPixel(dpy, screen));
XStoreName(dpy, win, "slogin");
XSelectInput(dpy, win, ExposureMask | KeyPressMask);
gc = XCreateGC(dpy, win, 0, NULL);
updateaccent(dpy, cmap, gc, win);
XMapRaised(dpy, win);
font = XLoadQueryFont(dpy, "fixed");
if (font)
XSetFont(dpy, gc, font->fid);
char user[64] = "";
char pass[64] = "";
int stage = 0;
draw(dpy, win, gc, "user:", user, 0);
for (;;) {
if (XPending(dpy)) {
XNextEvent(dpy, &ev);
if (ev.type == Expose) {
draw(dpy, win, gc, stage ? "pass:" : "user:",
stage ? pass : user, stage);
} else if (ev.type == KeyPress) {
char buf[32];
KeySym ksym;
int len = XLookupString(&ev.xkey, buf, sizeof buf, &ksym, NULL);
if (ksym == XK_Return) {
if (stage == 0) {
stage = 1;
draw(dpy, win, gc, "pass:", pass, 1);
} else {
if (auth(user, pass)) {
struct passwd *pw = getpwnam(user);
if (!pw)
exit(1);
chdir(pw->pw_dir);
setenv("HOME", pw->pw_dir, 1);
setenv("SHELL", pw->pw_shell, 1);
setenv("USER", pw->pw_name, 1);
setenv("LOGNAME", pw->pw_name, 1);
initgroups(pw->pw_name, pw->pw_gid);
setgid(pw->pw_gid);
setuid(pw->pw_uid);
execlp(pw->pw_shell, pw->pw_shell, "-l", NULL);
perror("execlp");
exit(1);
} else {
user[0] = pass[0] = '\0';
stage = 0;
draw(dpy, win, gc, "user:", user, 0);
}
}
} else if (ksym == XK_BackSpace) {
if (stage == 0) {
size_t n = strlen(user);
if (n) user[n-1] = '\0';
draw(dpy, win, gc, "user:", user, 0);
} else {
size_t n = strlen(pass);
if (n) pass[n-1] = '\0';
draw(dpy, win, gc, "pass:", pass, 1);
}
} else if (len && !iscntrl((unsigned char)buf[0])) {
if (stage == 0 && strlen(user) + len < sizeof user - 1) {
strncat(user, buf, len);
draw(dpy, win, gc, "user:", user, 0);
} else if (stage == 1 && strlen(pass) + len < sizeof pass - 1) {
strncat(pass, buf, len);
draw(dpy, win, gc, "pass:", pass, 1);
}
}
}
}
updateaccent(dpy, cmap, gc, win);
usleep(20000);
}
}
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