xlock/sun-src/xlock.c

/*
 * Copyright (c) 1988, 2011, Oracle and/or its affiliates. All rights reserved.
 *
 * 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 (including the next
 * paragraph) 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.
 */
/*
 * xlock.c - X11 client to lock a display and show a screen saver.
 *
 * Copyright (c) 1988-91 by Patrick J. Naughton.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose and without fee is hereby granted,
 * provided that the above copyright notice appear in all copies and that
 * both that copyright notice and this permission notice appear in
 * supporting documentation.
 *
 * This file is provided AS IS with no warranties of any kind.  The author
 * shall have no liability with respect to the infringement of copyrights,
 * trade secrets or any patents by this file or any part thereof.  In no
 * event will the author be liable for any lost revenue or profits or
 * other special, indirect and consequential damages.
 *
 * Comments and additions should be sent to the author:
 *
 *             naughton@eng.sun.com
 *
 *             Patrick J. Naughton
 *             MS 10-20
 *             Sun Laboritories, Inc.
 *             2550 Garcia Ave
 *             Mountain View, CA  94043
 *
 * Revision History:
 *
 * 24-Jun-91: make foreground and background color get used on mono.
 * 24-May-91: added -usefirst.
 * 16-May-91: added pyro and random modes.
 *        ripped big comment block out of all other files.
 * 08-Jan-91: fix some problems with password entry.
 *        removed renicing code.
 * 29-Oct-90: added cast to XFree() arg.
 *        added volume arg to call to XBell().
 * 28-Oct-90: center prompt screen.
 *        make sure Xlib input buffer does not use up all of swap.
 *        make displayed text come from resource file for better I18N.
 *        add backward compatible signal handlers for pre 4.1 machines.
 * 31-Aug-90: added blank mode.
 *        added swarm mode.
 *        moved usleep() and seconds() out to usleep.c.
 *        added SVR4 defines to xlock.h
 * 29-Jul-90: added support for multiple screens to be locked by one xlock.
 *        moved global defines to xlock.h
 *        removed use of allowsig().
 * 07-Jul-90: reworked commandline args and resources to use Xrm.
 *        moved resource processing out to resource.c
 * 02-Jul-90: reworked colors to not use dynamic colormap.
 * 23-May-90: added autoraise when obscured.
 * 15-Apr-90: added hostent alias searching for host authentication.
 * 18-Feb-90: added SunOS3.5 fix.
 *        changed -mono -> -color, and -saver -> -lock.
 *        allow non-locking screensavers to display on remote machine.
 *        added -echokeys to disable echoing of '?'s on input.
 *        cleaned up all of the parameters and defaults.
 * 20-Dec-89: added -xhost to allow access control list to be left alone.
 *        added -screensaver (don't disable screen saver) for the paranoid.
 *        Moved seconds() here from all of the display mode source files.
 *        Fixed bug with calling XUngrabHosts() in finish().
 * 19-Dec-89: Fixed bug in GrabPointer.
 *        Changed fontname to XLFD style.
 * 23-Sep-89: Added fix to allow local hostname:0 as a display.
 *        Put empty case for Enter/Leave events.
 *        Moved colormap installation later in startup.
 * 20-Sep-89: Linted and made -saver mode grab the keyboard and mouse.
 *        Replaced SunView code for life mode with Jim Graham's version,
 *      so I could contrib it without legal problems.
 *        Sent to expo for X11R4 contrib.
 * 19-Sep-89: Added '?'s on input.
 * 27-Mar-89: Added -qix mode.
 *        Fixed GContext->GC.
 * 20-Mar-89: Added backup font (fixed) if XQueryLoadFont() fails.
 *        Changed default font to lucida-sans-24.
 * 08-Mar-89: Added -nice, -mode and -display, built vector for life and hop.
 * 24-Feb-89: Replaced hopalong display with life display from SunView1.
 * 22-Feb-89: Added fix for color servers with n < 8 planes.
 * 16-Feb-89: Updated calling conventions for XCreateHsbColormap();
 *        Added -count for number of iterations per color.
 *        Fixed defaulting mechanism.
 *        Ripped out VMS hacks.
 *        Sent to expo for X11R3 contrib.
 * 15-Feb-89: Changed default font to pellucida-sans-18.
 * 20-Jan-89: Added -verbose and fixed usage message.
 * 19-Jan-89: Fixed monochrome gc bug.
 * 16-Dec-88: Added SunView style password prompting.
 * 19-Sep-88: Changed -color to -mono. (default is color on color displays).
 *        Added -saver option. (just do display... don't lock.)
 * 31-Aug-88: Added -time option.
 *        Removed code for fractals to separate file for modularity.
 *        Added signal handler to restore host access.
 *        Installs dynamic colormap with a Hue Ramp.
 *        If grabs fail then exit.
 *        Added VMS Hacks. (password 'iwiwuu').
 *        Sent to expo for X11R2 contrib.
 * 08-Jun-88: Fixed root password pointer problem and changed PASSLENGTH to 20.
 * 20-May-88: Added -root to allow root to unlock.
 * 12-Apr-88: Added root password override.
 *        Added screen saver override.
 *        Removed XGrabServer/XUngrabServer.
 *        Added access control handling instead.
 * 01-Apr-88: Added XGrabServer/XUngrabServer for more security.
 * 30-Mar-88: Removed startup password requirement.
 *        Removed cursor to avoid phosphor burn.
 * 27-Mar-88: Rotate fractal by 45 degrees clockwise.
 * 24-Mar-88: Added color support. [-color]
 *        wrote the man page.
 * 23-Mar-88: Added HOPALONG routines from Scientific American Sept. 86 p. 14.
 *        added password requirement for invokation
 *        removed option for command line password
 *        added requirement for display to be "unix:0".
 * 22-Mar-88: Recieved Walter Milliken's comp.windows.x posting.
 *
 */

#include <stdio.h>
#include <signal.h>
#include <string.h>
#include <stdarg.h>
#include <crypt.h>
#ifdef SYSV
#include <shadow.h>
#endif
#include <pwd.h>

#include "xlock.h"
#include <X11/cursorfont.h>
#include <X11/Xatom.h>

#ifdef USE_PAM
# include <security/pam_appl.h>
# ifndef XLOCK_PAM_SERVICE
#  define XLOCK_PAM_SERVICE "xlock"
# endif
# define PAM_ERROR_PRINT(pamfunc)   \
 if (verbose) { \
   fprintf(stderr, "%s: %s failure: %s\n", ProgramName, pamfunc, \
     pam_strerror(pamh, pam_error)); \
 }
# ifdef sun
#  include <deflt.h>
# endif
#endif

char       *ProgramName;    /* argv[0] */
perscreen   Scr[MAXSCREENS];
Display    *dsp = NULL;     /* server display connection */
int         screen;     /* current screen */
void        (*callback) () = NULL;
void        (*init) () = NULL;

static int  screens;        /* number of screens */
static Window win[MAXSCREENS];  /* window used to cover screen */
static Window icon[MAXSCREENS]; /* window used during password typein */
static Window root[MAXSCREENS]; /* convenience pointer to the root window */
static GC   textgc[MAXSCREENS]; /* graphics context used for text rendering */
static XColor fgcol[MAXSCREENS];/* used for text rendering */
static XColor bgcol[MAXSCREENS];/* background of text screen */
XColor ssblack[MAXSCREENS];/* black color for screen saver screen */
XColor sswhite[MAXSCREENS];/* white color for screen saver screen */
static int  iconx[MAXSCREENS];  /* location of left edge of icon */
static int  icony[MAXSCREENS];  /* location of top edge of icon */
static Cursor mycursor;     /* blank cursor */
static Cursor passwdcursor; /* cursor used in getPassword */
static Pixmap lockc;
static Pixmap lockm;        /* pixmaps for cursor and mask */
static char no_bits[] = {0};    /* dummy array for the blank cursor */
static int  passx;      /* position of the ?'s */
static int  passy;
static XFontStruct *font;
static int  sstimeout;      /* screen saver parameters */
static int  ssinterval;
static int  ssblanking;
static int  ssexposures;

static char buffer[PAM_MAX_RESP_SIZE];
static Bool reallyechokeys = False; /* Echo real keys instead of ?'s */
static Bool stoptryingfornow = False;

#define FALLBACK_FONTNAME   "fixed"
#define ICONW           64
#define ICONH           64

#ifdef DEBUG
#define WIDTH WidthOfScreen(scr) - 100
#define HEIGHT HeightOfScreen(scr) - 100
#define CWMASK CWBackPixel | CWEventMask | CWColormap
#else
#define WIDTH WidthOfScreen(scr)
#define HEIGHT HeightOfScreen(scr)
#define CWMASK CWOverrideRedirect | CWBackPixel | CWEventMask | CWColormap
#endif

#define AllPointerEventMask \
    (ButtonPressMask | ButtonReleaseMask | \
    EnterWindowMask | LeaveWindowMask | \
    PointerMotionMask | PointerMotionHintMask | \
    Button1MotionMask | Button2MotionMask | \
    Button3MotionMask | Button4MotionMask | \
    Button5MotionMask | ButtonMotionMask | \
    KeymapStateMask)

void
error(const char *format, ...)
{
    va_list args;

    fprintf(stderr, "%s: ", ProgramName);
    va_start(args, format);
    vfprintf(stderr, format, args);
    va_end(args);
    exit(1);
}

/*
 * Server access control support.
 */

static XHostAddress *XHosts;    /* the list of "friendly" client machines */
static int  HostAccessCount;    /* the number of machines in XHosts */
static Bool HostAccessState;    /* whether or not we even look at the list */

static void
XGrabHosts(dsp)
    Display    *dsp;
{
    XHosts = XListHosts(dsp, &HostAccessCount, &HostAccessState);
    if (XHosts)
    XRemoveHosts(dsp, XHosts, HostAccessCount);
    XEnableAccessControl(dsp);
}

static void
XUngrabHosts(dsp)
    Display    *dsp;
{
    if (XHosts) {
    XAddHosts(dsp, XHosts, HostAccessCount);
    XFree((char *) XHosts);
    }
    if (HostAccessState == False)
    XDisableAccessControl(dsp);
}


/*
 * Simple wrapper to get an asynchronous grab on the keyboard and mouse.
 * If either grab fails, we sleep for one second and try again since some
 * window manager might have had the mouse grabbed to drive the menu choice
 * that picked "Lock Screen..".  If either one fails the second time we print
 * an error message and exit.
 */
static void
GrabKeyboardAndMouse()
{
    Status      status;

    status = XGrabKeyboard(dsp, win[0], True,
               GrabModeAsync, GrabModeAsync, CurrentTime);
    if (status != GrabSuccess) {
    sleep(1);
    status = XGrabKeyboard(dsp, win[0], True,
                   GrabModeAsync, GrabModeAsync, CurrentTime);

    if (status != GrabSuccess)
        error("couldn't grab keyboard! (%d)\n", status);
    }
    status = XGrabPointer(dsp, win[0], True, AllPointerEventMask,
              GrabModeAsync, GrabModeAsync, None, mycursor,
              CurrentTime);
    if (status != GrabSuccess) {
    sleep(1);
    status = XGrabPointer(dsp, win[0], True, AllPointerEventMask,
                  GrabModeAsync, GrabModeAsync, None, mycursor,
                  CurrentTime);

    if (status != GrabSuccess)
        error("couldn't grab pointer! (%d)\n", status);
    }
}


/*
 * Assuming that we already have an asynch grab on the pointer,
 * just grab it again with a new cursor shape and ignore the return code.
 */
static void
XChangeGrabbedCursor(cursor)
    Cursor      cursor;
{
#ifndef DEBUG
    (void) XGrabPointer(dsp, win[0], True, AllPointerEventMask,
            GrabModeAsync, GrabModeAsync, None, cursor, CurrentTime);
#endif
}


/*
 * Restore all grabs, reset screensaver, restore colormap, close connection.
 */
static void
finish()
{
    XSync(dsp, False);
    if (!nolock && !allowaccess)
    XUngrabHosts(dsp);
    XUngrabPointer(dsp, CurrentTime);
    XUngrabKeyboard(dsp, CurrentTime);
    if (!enablesaver)
    XSetScreenSaver(dsp, sstimeout, ssinterval, ssblanking, ssexposures);
    XFlush(dsp);
    XCloseDisplay(dsp);
}


static int
ReadXString(s, slen)
    char       *s;
    int         slen;
{
    XEvent      event;
    char        keystr[20];
    char        c;
    int         i;
    int         bp;
    int         len;
    int         thisscreen = screen;
    char    pwbuf[PAM_MAX_RESP_SIZE];

    for (screen = 0; screen < screens; screen++)
    if (thisscreen == screen)
        init(icon[screen]);
    else
        init(win[screen]);
    bp = 0;
    *s = 0;
    while (True) {
    unsigned long lasteventtime = seconds();
    while (!XPending(dsp)) {
        for (screen = 0; screen < screens; screen++)
        if (thisscreen == screen)
            callback(icon[screen]);
        else
            callback(win[screen]);
        XFlush(dsp);
        usleep(delay);
        if (seconds() - lasteventtime > timeout) {
        screen = thisscreen;
        stoptryingfornow = True;
        return 1;
        }
    }
    screen = thisscreen;
    XNextEvent(dsp, &event);
    switch (event.type) {
    case KeyPress:
        len = XLookupString((XKeyEvent *) & event, keystr, 20, NULL, NULL);
        for (i = 0; i < len; i++) {
        c = keystr[i];
        switch (c) {
        case 8: /* ^H */
        case 127:   /* DEL */
            if (bp > 0)
            bp--;
            break;
        case 10:    /* ^J */
        case 13:    /* ^M */
            s[bp] = '\0';
                /*
                 * eat all events if there are more than enough pending... this
                 * keeps the Xlib event buffer from growing larger than all
                 * available memory and crashing xlock.
                 */
                if (XPending(dsp) > 100) {  /* 100 is arbitrarily big enough */
                register Status status;
                do {
                    status = XCheckMaskEvent(dsp,
                              KeyPressMask | KeyReleaseMask, &event);
                } while (status);
                XBell(dsp, 100);
                }
            return 0;
        case 21:    /* ^U */
            bp = 0;
            break;
        default:
            s[bp] = c;
            if (bp < slen - 1)
            bp++;
            else
            XSync(dsp, True);   /* flush input buffer */
        }
        }
        XSetForeground(dsp, Scr[screen].gc, bgcol[screen].pixel);
        if (echokeys || reallyechokeys) {
        if (reallyechokeys) {
            memcpy(pwbuf, s, slen);
        } else {
            memset(pwbuf, '?', slen);
        }

        XFillRectangle(dsp, win[screen], Scr[screen].gc,
                   passx, passy - font->ascent,
                   XTextWidth(font, pwbuf, slen),
                   font->ascent + font->descent);
        XDrawString(dsp, win[screen], textgc[screen],
                passx, passy, pwbuf, bp);
        }
        /*
         * eat all events if there are more than enough pending... this
         * keeps the Xlib event buffer from growing larger than all
         * available memory and crashing xlock.
         */
        if (XPending(dsp) > 100) {  /* 100 is arbitrarily big enough */
        register Status status;
        do {
            status = XCheckMaskEvent(dsp,
                      KeyPressMask | KeyReleaseMask, &event);
        } while (status);
        XBell(dsp, 100);
        }
        break;

    case ButtonPress:
        if (((XButtonEvent *) & event)->window == icon[screen]) {
        stoptryingfornow = True;
        return 1;
        }
        break;

    case VisibilityNotify:
        if (event.xvisibility.state != VisibilityUnobscured) {
#ifndef DEBUG
        XRaiseWindow(dsp, win[screen]);
#endif
        s[0] = '\0';
        return 1;
        }
        break;

    case KeymapNotify:
    case KeyRelease:
    case ButtonRelease:
    case MotionNotify:
    case LeaveNotify:
    case EnterNotify:
        break;

    default:
        fprintf(stderr, "%s: unexpected event: %d\n",
            ProgramName, event.type);
        break;
    }
    }
}


static int
CheckPassword()
{
#ifdef SYSV
    struct spwd *rspw, *uspw;
    struct passwd *upw;
    const char  *user;
#else
    struct passwd *rpw, *upw;
#endif /* SYSV */

#ifdef SYSV
    rspw = getspnam("root");

    upw = (struct passwd *)getpwuid(getuid());
    if (upw == NULL) {  /* should not pass NULL to getspnam  */
    user = "";
    }
    else {
    user = upw->pw_name;
    }
    uspw = getspnam(user);
    if (!uspw) {
    if (allowroot) {
        if (!rspw)
            return(1);
        else
            return(0);
    }
    return(1);
    }
#else   /* SYSV */
    rpw = (struct passwd *)getpwuid(0);

    upw = (struct passwd *)getpwuid(getuid());

    if (!upw) {
    if (allowroot) {
        if (!rpw)
            return(1);
        else
            return(0);
    }
    return(1);
    }
#endif  /* SYSV */

    return(0);
}


static void passwordPrompt(const char *prompt)
{
    int         y, left;
    Screen     *scr = ScreenOfDisplay(dsp, screen);

    left = iconx[screen] + ICONW + font->max_bounds.width;
    y = icony[screen] + font->ascent + font->ascent + font->descent + 2;

    XSetForeground(dsp, Scr[screen].gc, bgcol[screen].pixel);

    XFillRectangle(dsp, win[screen], Scr[screen].gc,
               left, y - font->ascent, WIDTH - left,
                   font->ascent + font->descent + 2);

    XDrawString(dsp, win[screen], textgc[screen],
        left, y, prompt, strlen(prompt));
    XDrawString(dsp, win[screen], textgc[screen],
        left + 1, y, prompt, strlen(prompt));

    passx = left + 1 + XTextWidth(font, prompt, strlen(prompt))
    + XTextWidth(font, " ", 1);
    passy = y;
}

static void displayTextInfo(const char *infoMsg)
{
    int         y;
    Screen     *scr = ScreenOfDisplay(dsp, screen);

    y = icony[screen] + ICONH + font->ascent + 2;

    XSetForeground(dsp, Scr[screen].gc, bgcol[screen].pixel);

    XFillRectangle(dsp, win[screen], Scr[screen].gc,
               iconx[screen], y - font->ascent,
               WIDTH - iconx[screen],
                   font->ascent + font->descent + 2);

    XDrawString(dsp, win[screen], textgc[screen],
        iconx[screen], y, infoMsg, strlen(infoMsg));
}

#ifdef USE_PAM
static int pamconv(int num_msg, struct pam_message **msg,
              struct pam_response **response, void *appdata_ptr)
{
    int i;
    int status = PAM_SUCCESS;

    struct pam_message      *m;
    struct pam_response     *r;

    *response = calloc(num_msg, sizeof (struct pam_response));
    if (*response == NULL)
    return (PAM_BUF_ERR);

    m = *msg;
    r = *response;

    for (i = 0; i < num_msg; i++ , m++ , r++) {
#ifdef DEBUG
    if (verbose) {
        fprintf(stderr, "pam_msg: %d: '%s'\n", m->msg_style, m->msg);
    }
#endif
    switch (m->msg_style) {
      case PAM_ERROR_MSG:
      case PAM_TEXT_INFO:
        displayTextInfo(m->msg);
        break;

          case PAM_PROMPT_ECHO_ON:
        reallyechokeys = True;
        /* FALLTHRU */
          case PAM_PROMPT_ECHO_OFF:
        passwordPrompt(m->msg);
        if (ReadXString(buffer, PAM_MAX_RESP_SIZE)) {
        /* timeout or other error */
        status = PAM_CONV_ERR;
        i = num_msg;
        } else {
        r->resp = strdup(buffer);
        if (r->resp == NULL) {
            status = PAM_BUF_ERR;
            i = num_msg;
        }
#ifdef DEBUG
        if (verbose) {
            fprintf(stderr, "pam_resp: '%s'\n", r->resp);
        }
#endif
        }
        reallyechokeys = False;
        break;

      default:
        if (verbose) {
        fprintf(stderr, "%s: Unknown PAM msg_style: %d\n",
          ProgramName, m->msg_style);
        }
    }
    }
    if (status != PAM_SUCCESS) {
    /* free responses */
    r = *response;
    for (i = 0; i < num_msg; i++, r++) {
        if (r->resp)
        free(r->resp);
    }
    free(*response);
    *response = NULL;
    }
    return status;
}
#endif

#ifdef  sun
#include <syslog.h>
#include <bsm/adt.h>
#include <bsm/adt_event.h>


/*
 * audit_lock - audit entry to screenlock
 *
 *  Entry   Process running with appropriate privilege to generate
 *          audit records and real uid of the user.
 *
 *  Exit    ADT_screenlock audit record written.
 */
static void
audit_lock(void)
{
    adt_session_data_t  *ah;    /* audit session handle */
    adt_event_data_t    *event; /* audit event handle */

    /* Audit start of screen lock -- equivalent to logout ;-) */

    if (adt_start_session(&ah, NULL, ADT_USE_PROC_DATA) != 0) {

        syslog(LOG_AUTH | LOG_ALERT, "adt_start_session: %m");
        return;
    }
    if ((event = adt_alloc_event(ah, ADT_screenlock)) == NULL) {

        syslog(LOG_AUTH | LOG_ALERT,
            "adt_alloc_event(ADT_screenlock): %m");
    } else {
        if (adt_put_event(event, ADT_SUCCESS, ADT_SUCCESS) != 0) {

            syslog(LOG_AUTH | LOG_ALERT,
                "adt_put_event(ADT_screenlock): %m");
        }
        adt_free_event(event);
    }
    (void) adt_end_session(ah);
}


/*
 * audit_unlock - audit screen unlock
 *
 *  Entry   Process running with appropriate privilege to generate
 *          audit records and real uid of the user.
 *      pam_status = PAM error code; reason for failure.
 *
 *  Exit    ADT_screenunlock audit record written.
 */
static void
audit_unlock(int pam_status)
{
    adt_session_data_t  *ah;    /* audit session handle */
    adt_event_data_t    *event; /* audit event handle */

    if (adt_start_session(&ah, NULL, ADT_USE_PROC_DATA) != 0) {

        syslog(LOG_AUTH | LOG_ALERT,
            "adt_start_session(ADT_screenunlock): %m");
        return;
    }
    if ((event = adt_alloc_event(ah, ADT_screenunlock)) == NULL) {

        syslog(LOG_AUTH | LOG_ALERT,
            "adt_alloc_event(ADT_screenunlock): %m");
    } else {
        if (adt_put_event(event,
            pam_status == PAM_SUCCESS ? ADT_SUCCESS : ADT_FAILURE,
            pam_status == PAM_SUCCESS ? ADT_SUCCESS : ADT_FAIL_PAM +
            pam_status) != 0) {

            syslog(LOG_AUTH | LOG_ALERT,
                "adt_put_event(ADT_screenunlock(%s): %m",
                pam_strerror(NULL, pam_status));
        }
        adt_free_event(event);
    }
    (void) adt_end_session(ah);
}


/*
 * audit_passwd - audit password change
 *  Entry   Process running with appropriate privilege to generate
 *          audit records and real uid of the user.
 *      pam_status = PAM error code; reason for failure.
 *
 *  Exit    ADT_passwd audit record written.
 */
static void
audit_passwd(int pam_status)
{
    adt_session_data_t  *ah;    /* audit session handle */
    adt_event_data_t    *event; /* audit event handle */

    if (adt_start_session(&ah, NULL, ADT_USE_PROC_DATA) != 0) {

        syslog(LOG_AUTH | LOG_ALERT,
            "adt_start_session(ADT_passwd): %m");
        return;
    }
    if ((event = adt_alloc_event(ah, ADT_passwd)) == NULL) {

        syslog(LOG_AUTH | LOG_ALERT,
            "adt_alloc_event(ADT_passwd): %m");
    } else {
        if (adt_put_event(event,
            pam_status == PAM_SUCCESS ? ADT_SUCCESS : ADT_FAILURE,
            pam_status == PAM_SUCCESS ? ADT_SUCCESS : ADT_FAIL_PAM +
            pam_status) != 0) {

            syslog(LOG_AUTH | LOG_ALERT,
                "adt_put_event(ADT_passwd(%s): %m",
                pam_strerror(NULL, pam_status));
        }
        adt_free_event(event);
    }
    (void) adt_end_session(ah);
}
#endif  /* sun */

static int
getPassword()
{
    char       *userpass = NULL;
    char       *rootpass = NULL;
    XWindowAttributes xgwa;
    int         y, left, done;
#ifdef SYSV
    struct spwd *rspw, *uspw;
    char       *suserpass = NULL;
    char       *srootpass = NULL;
    const char *user;
#else
    const char *user = getenv("USER");
#endif /* SYSV */
    struct passwd *rpw, *upw;
#ifdef USE_PAM
    pam_handle_t *pamh = NULL;
    struct pam_conv pc;
    Bool    use_pam = True;
    int     pam_error;
    int     pam_flags = 0;
#endif
    const char *authErrMsg = text_invalid;

#ifdef SYSV
    rpw = getpwuid(0);
    if (rpw) {
       user = rpw->pw_name;
       rootpass = strdup(rpw->pw_passwd);

       rspw = getspnam(user);
       if (rspw && rspw->sp_pwdp)
       srootpass = strdup(rspw->sp_pwdp);
    }

    upw = getpwuid(getuid());
    if (upw) {
       user = upw->pw_name;
       userpass = strdup(upw->pw_passwd);

       uspw = getspnam(user);
       if (uspw && uspw->sp_pwdp)
       suserpass = strdup(uspw->sp_pwdp);
    }
    else
       user = "";
#else
    rpw = (struct passwd *)getpwuid(0);
    if (rpw)
       rootpass = strdup(rpw->pw_passwd);

    upw = (struct passwd *)getpwuid(getuid());
    if (upw)
       userpass = strdup(upw->pw_passwd);
#endif /* SYSV */

#ifdef USE_PAM
    pc.conv = pamconv;

    pam_error = pam_start(XLOCK_PAM_SERVICE, user, &pc, &pamh);
    if (pam_error != PAM_SUCCESS) {
    use_pam = False;
    PAM_ERROR_PRINT("pam_start");
    } else {
#ifdef sun
    /* Check /etc/default/login to see if we should add
       PAM_DISALLOW_NULL_AUTHTOK to pam_flags */
    if (defopen("/etc/default/login") == 0) {
        char *ptr;

        int flags = defcntl(DC_GETFLAGS, 0);
        TURNOFF(flags, DC_CASE);
        (void) defcntl(DC_SETFLAGS, flags);

        if ((ptr = defread("PASSREQ=")) != NULL &&
          strcasecmp("YES", ptr) == 0) {
        pam_flags |= PAM_DISALLOW_NULL_AUTHTOK;
        }

        (void) defopen((char *)NULL); /* close current file */
    }

#endif
#ifdef SYSV
    /* Disable user password non-PAM authentication */
    if (userpass) {
        memset(userpass, 0, strlen(userpass));
        free(userpass);
        userpass = NULL;
    }
    if (suserpass) {
        memset(suserpass, 0, strlen(suserpass));
        free(suserpass);
        suserpass = NULL;
    }
#endif
    }
#endif /* USE_PAM */

    XGetWindowAttributes(dsp, win[screen], &xgwa);

    XChangeGrabbedCursor(passwdcursor);

    XSetForeground(dsp, Scr[screen].gc, bgcol[screen].pixel);
    XFillRectangle(dsp, win[screen], Scr[screen].gc,
           0, 0, xgwa.width, xgwa.height);

    XMapWindow(dsp, icon[screen]);
    XRaiseWindow(dsp, icon[screen]);

    left = iconx[screen] + ICONW + font->max_bounds.width;
    y = icony[screen] + font->ascent;

    XDrawString(dsp, win[screen], textgc[screen],
        left, y, text_name, strlen(text_name));
    XDrawString(dsp, win[screen], textgc[screen],
        left + 1, y, text_name, strlen(text_name));
    XDrawString(dsp, win[screen], textgc[screen],
        left + XTextWidth(font, text_name, strlen(text_name)), y,
        user, strlen(user));

    y = icony[screen] - (font->descent + 2);

    XDrawString(dsp, win[screen], textgc[screen],
        iconx[screen], y, text_info, strlen(text_info));

    passwordPrompt(text_pass);

    XFlush(dsp);

    y = icony[screen] + ICONH + font->ascent + 2
      + font->ascent + font->descent + 2;

    done = False;
    stoptryingfornow = False;
    while (!done) {
#ifdef USE_PAM
    if (use_pam) {

        pam_error = pam_authenticate(pamh, pam_flags);
        if (pam_error == PAM_SUCCESS) {
        const char *pam_error_from = "pam_acct_mgmt";

        pam_error = pam_acct_mgmt(pamh, pam_flags);

        if (pam_error == PAM_NEW_AUTHTOK_REQD) {
            do {
            pam_error = pam_chauthtok(pamh,
                          PAM_CHANGE_EXPIRED_AUTHTOK);
            } while (pam_error == PAM_AUTHTOK_ERR ||
              pam_error == PAM_TRY_AGAIN);
            pam_error_from = "pam_chauthtok";
#ifdef  sun
            audit_passwd(pam_error);
#endif  /* sun */
        }

        if (pam_error == PAM_SUCCESS) {
            pam_error = pam_setcred(pamh,PAM_REFRESH_CRED);
            if (pam_error != PAM_SUCCESS) {
            PAM_ERROR_PRINT("pam_setcred(PAM_REFRESH_CRED)");
            } else {
            done = True;
            }
        } else {
#ifdef  sun
                audit_unlock(pam_error);
#endif  /* sun */
            PAM_ERROR_PRINT(pam_error_from);
        }
        } else if (stoptryingfornow) {
        break;
        } else {
#ifdef  sun
            audit_unlock(pam_error);
#endif  /* sun */
        PAM_ERROR_PRINT("pam_authenticate");
        }

        if (pam_error != PAM_SUCCESS) {
        authErrMsg = pam_strerror(pamh, pam_error);
        }
    } else
    if (ReadXString(buffer, PAM_MAX_RESP_SIZE))
        break;
#endif

    /*
     *  This section gets a little messy.  In SYSV, the number of
     *  cases to handle increases because of the existence of the
     *  shadow file.  There are also a number of cases that need
     *  to be dealt with where either root or user passwords are
     *  nil.  Hopefully the code below is easy enough to follow.
     */

#ifdef SYSV
    if (userpass) {
        if (*userpass == NULL) {
        done = (*buffer == NULL);
        } else {
        done = (!strcmp(crypt(buffer, userpass), userpass));
        }
    }
    if (!done && suserpass) {
        if (*suserpass == NULL) {
        done = (*buffer == NULL);
        } else {
        done = (!strcmp(crypt(buffer, suserpass), suserpass));
        }
    }
    if (!done && allowroot) {
        if (srootpass) {
        if (*srootpass == NULL) {
            done = (*buffer == NULL);
        } else {
            done = (!strcmp(crypt(buffer, srootpass), srootpass));
        }
        }
        if (!done && rootpass) {
        if (*rootpass == NULL) {
            done = (*buffer == NULL);
        } else {
            done = (!strcmp(crypt(buffer, rootpass), rootpass));
        }
        }
        }
#else
    done = !((strcmp(crypt(buffer, userpass), userpass))
           && (!allowroot || strcmp(crypt(buffer, rootpass), rootpass)));

    if (!done && *buffer == NULL) {
        /* just hit return, and it wasn't his password */
        break;
    }
    if (*userpass == NULL && *buffer != NULL) {
        /*
         * the user has no password, but something was typed anyway.
         * sounds fishy: don't let him in...
         */
        done = False;
    }
#endif /* SYSV */

    /* clear plaintext password so you can't grunge around /dev/kmem */
    memset(buffer, 0, sizeof(buffer));

    displayTextInfo(text_valid);

    if (done) {
        /* clear encrypted passwords just in case */
        if (rootpass) {
        memset(rootpass, 0, strlen(rootpass));
        free(rootpass);
        }
        if (userpass) {
        memset(userpass, 0, strlen(userpass));
        free(userpass);
        }
#ifdef SYSV
        if (srootpass) {
        memset(srootpass, 0, strlen(srootpass));
        free(srootpass);
        }
        if (suserpass) {
        memset(suserpass, 0, strlen(suserpass));
        free(suserpass);
        }
#endif
#ifdef USE_PAM
#ifdef  sun
        audit_unlock(pam_error);
#endif  /* sun */
        pam_end(pamh, pam_error);
#endif
        return 0;
    } else {
        XSync(dsp, True);   /* flush input buffer */
        sleep(1);

        displayTextInfo(authErrMsg);

        if (echokeys || reallyechokeys) /* erase old echo */
        XFillRectangle(dsp, win[screen], Scr[screen].gc,
                   passx, passy - font->ascent,
                   xgwa.width - passx,
                   font->ascent + font->descent);
    }
    }
    /* clear encrypted passwords just in case */
    if (rootpass) {
    memset(rootpass, 0, strlen(rootpass));
    free(rootpass);
    }
    if (userpass) {
    memset(userpass, 0, strlen(userpass));
    free(userpass);
    }
#ifdef SYSV
    if (srootpass) {
    memset(srootpass, 0, strlen(srootpass));
    free(srootpass);
    }
    if (suserpass) {
    memset(suserpass, 0, strlen(suserpass));
    free(suserpass);
    }
#endif
#ifdef USE_PAM
    pam_end(pamh, pam_error);
#endif
    XChangeGrabbedCursor(mycursor);
    XUnmapWindow(dsp, icon[screen]);
    return 1;
}


static void
justDisplay()
{
    XEvent      event;

    for (screen = 0; screen < screens; screen++)
    init(win[screen]);
    do {
    while (!XPending(dsp)) {
        for (screen = 0; screen < screens; screen++)
        callback(win[screen]);
        XFlush(dsp);
        usleep(delay);
    }
    XNextEvent(dsp, &event);
#ifndef DEBUG
    if (event.type == VisibilityNotify)
        XRaiseWindow(dsp, event.xany.window);
#endif
    } while (event.type != ButtonPress && event.type != KeyPress);
    for (screen = 0; screen < screens; screen++)
    if (event.xbutton.root == RootWindow(dsp, screen))
        break;
    if (usefirst)
    XPutBackEvent(dsp, &event);
}


static void
sigcatch()
{
    finish();
    error("caught terminate signal.\nAccess control list restored.\n");
}


static void
lockDisplay()
{
    if (!allowaccess) {
#ifdef SYSV
    sigset_t    oldsigmask;
    sigset_t    newsigmask;

    sigemptyset(&newsigmask);
    sigaddset(&newsigmask, SIGHUP);
    sigaddset(&newsigmask, SIGINT);
    sigaddset(&newsigmask, SIGQUIT);
    sigaddset(&newsigmask, SIGTERM);
    sigprocmask(SIG_BLOCK, &newsigmask, &oldsigmask);
#else
    int         oldsigmask;

    oldsigmask = sigblock(sigmask(SIGHUP) |
                  sigmask(SIGINT) |
                  sigmask(SIGQUIT) |
                  sigmask(SIGTERM));
#endif

    signal(SIGHUP, (void (*)()) sigcatch);
    signal(SIGINT, (void (*)()) sigcatch);
    signal(SIGQUIT, (void (*)()) sigcatch);
    signal(SIGTERM, (void (*)()) sigcatch);

    XGrabHosts(dsp);

#ifdef SYSV
    sigprocmask(SIG_SETMASK, &oldsigmask, &oldsigmask);
#else
    sigsetmask(oldsigmask);
#endif
    }
#ifdef  sun
    audit_lock();
#endif  /* sun */
    do {
    justDisplay();
    } while (getPassword());
}


int
main(argc, argv)
    int         argc;
    char       *argv[];
{
    XSetWindowAttributes xswa;
    XGCValues   xgcv;

    ProgramName = strrchr(argv[0], '/');
    if (ProgramName)
    ProgramName++;
    else
    ProgramName = argv[0];

    srandom(time((long *) 0));  /* random mode needs the seed set. */

    GetResources(argc, argv);

    CheckResources();

    font = XLoadQueryFont(dsp, fontname);
    if (font == NULL) {
    fprintf(stderr, "%s: can't find font: %s, using %s...\n",
        ProgramName, fontname, FALLBACK_FONTNAME);
    font = XLoadQueryFont(dsp, FALLBACK_FONTNAME);
    if (font == NULL)
        error("can't even find %s!!!\n", FALLBACK_FONTNAME);
    }

    if (CheckPassword()) {
    error("can't get the user password. Exiting ...\n"
    "\tYou need to run xlock in setuid root mode on your local machine.\n"
    "\tContact your system administrator.\n");
    }

    screens = ScreenCount(dsp);
    if (screens > MAXSCREENS)
    error("can only support %d screens.\n", MAXSCREENS);
    for (screen = 0; screen < screens; screen++) {
    XColor      tmp;
    Screen     *scr = ScreenOfDisplay(dsp, screen);
    Visual      *vis = XDefaultVisual(dsp, screen);
    Colormap    cmap;
    root[screen] = RootWindowOfScreen(scr);

    cmap = XCreateColormap(dsp, root[screen], vis, AllocNone);

    XAllocNamedColor(dsp, cmap, "White", &sswhite[screen], &tmp);
    XAllocNamedColor(dsp, cmap, "Black", &ssblack[screen], &tmp);

    if (mono || CellsOfScreen(scr) == 2) {
        if (!XAllocNamedColor(dsp, cmap, background,
                  &bgcol[screen], &tmp)) {
        XAllocNamedColor(dsp, cmap, "White", &bgcol[screen], &tmp);
        }
        if (!XAllocNamedColor(dsp, cmap, foreground,
                  &fgcol[screen], &tmp)) {
        XAllocNamedColor(dsp, cmap, "Black", &fgcol[screen], &tmp);
        }
        Scr[screen].pixels[0] = fgcol[screen].pixel;
        Scr[screen].pixels[1] = bgcol[screen].pixel;
        Scr[screen].npixels = 2;
    } else {
        int         colorcount = NUMCOLORS;
        u_char      red[NUMCOLORS];
        u_char      green[NUMCOLORS];
        u_char      blue[NUMCOLORS];
        int         i;

        if (!XAllocNamedColor(dsp, cmap, background,
                  &bgcol[screen], &tmp)) {
        fprintf(stderr, "couldn't allocate: %s\n", background);
        XAllocNamedColor(dsp, cmap, "White", &bgcol[screen], &tmp);
        }
        if (!XAllocNamedColor(dsp, cmap, foreground,
                  &fgcol[screen], &tmp)) {
        fprintf(stderr, "couldn't allocate: %s\n", foreground);
        XAllocNamedColor(dsp, cmap, "Black", &fgcol[screen], &tmp);
        }
        hsbramp(0.0, saturation, 1.0, 1.0, saturation, 1.0, colorcount,
            red, green, blue);
        Scr[screen].npixels = 0;
        for (i = 0; i < colorcount; i++) {
        XColor      xcolor;

        xcolor.red = red[i] << 8;
        xcolor.green = green[i] << 8;
        xcolor.blue = blue[i] << 8;
        xcolor.flags = DoRed | DoGreen | DoBlue;

        if (!XAllocColor(dsp, cmap, &xcolor))
            break;

        Scr[screen].pixels[i] = xcolor.pixel;
        Scr[screen].npixels++;
        }
        if (verbose)
        fprintf(stderr, "%d pixels allocated\n", Scr[screen].npixels);
    }

    xswa.override_redirect = True;
    xswa.background_pixel = ssblack[screen].pixel;
    xswa.event_mask = KeyPressMask | ButtonPressMask | VisibilityChangeMask;
    xswa.colormap = cmap;       /* In DEBUG mode, we do not see this */

    win[screen] = XCreateWindow(dsp, root[screen], 0, 0, WIDTH, HEIGHT, 0,
                 CopyFromParent, InputOutput, CopyFromParent,
                    CWMASK, &xswa);

#ifdef DEBUG
    {
        XWMHints    xwmh;

        xwmh.flags = InputHint;
        xwmh.input = True;
        XChangeProperty(dsp, win[screen],
                XA_WM_HINTS, XA_WM_HINTS, 32, PropModeReplace,
            (unsigned char *) &xwmh, sizeof(xwmh) / sizeof(int));
    }
#endif

    iconx[screen] = (DisplayWidth(dsp, screen) -
             XTextWidth(font, text_info, strlen(text_info))) / 2;

    icony[screen] = DisplayHeight(dsp, screen) / 6;

    xswa.border_pixel = fgcol[screen].pixel;
    xswa.background_pixel = bgcol[screen].pixel;
    xswa.event_mask = ButtonPressMask;
    xswa.colormap = cmap;       /* In DEBUG mode, we do not see this */

#define CIMASK CWBorderPixel | CWBackPixel | CWEventMask | CWColormap
    icon[screen] = XCreateWindow(dsp, win[screen],
                     iconx[screen], icony[screen],
                     ICONW, ICONH, 1, CopyFromParent,
                     InputOutput, CopyFromParent,
                     CIMASK, &xswa);

    XMapWindow(dsp, win[screen]);
    XRaiseWindow(dsp, win[screen]);
    XInstallColormap(dsp, cmap);

    xgcv.foreground = sswhite[screen].pixel;
    xgcv.background = ssblack[screen].pixel;
    Scr[screen].gc = XCreateGC(dsp, win[screen],
                   GCForeground | GCBackground, &xgcv);

    xgcv.foreground = fgcol[screen].pixel;
    xgcv.background = bgcol[screen].pixel;
    xgcv.font = font->fid;
    textgc[screen] = XCreateGC(dsp, win[screen],
                GCFont | GCForeground | GCBackground, &xgcv);
    }
    lockc = XCreateBitmapFromData(dsp, root[0], no_bits, 1, 1);
    lockm = XCreateBitmapFromData(dsp, root[0], no_bits, 1, 1);
    mycursor = XCreatePixmapCursor(dsp, lockc, lockm,
                   &fgcol[screen], &bgcol[screen], 0, 0);
    passwdcursor = XCreateFontCursor(dsp, XC_left_ptr);
    XFreePixmap(dsp, lockc);
    XFreePixmap(dsp, lockm);


    if (!enablesaver) {
    XGetScreenSaver(dsp, &sstimeout, &ssinterval,
            &ssblanking, &ssexposures);
    XSetScreenSaver(dsp, 0, 0, 0, 0);   /* disable screen saver */
    }
#ifndef DEBUG
    GrabKeyboardAndMouse();
#endif

    nice(nicelevel);

    if (nolock)
    justDisplay();
    else
    lockDisplay();

    finish();

    return 0;
}