xref: /xsrc/external/mit/xdm/dist/greeter/greet.c

/*

Copyright 1988, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

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 OPEN GROUP 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.

Except as contained in this notice, the name of The Open Group shall
not be used in advertising or otherwise to promote the sale, use or
other dealings in this Software without prior written authorization
from The Open Group.

*/
/*
 * Copyright (c) 2006, Oracle and/or its affiliates.
 *
 * 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.
 */


/*
 * xdm - display manager daemon
 * Author:  Keith Packard, X Consortium
 *
 * widget to get username/password
 *
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <X11/Intrinsic.h>
#include <X11/StringDefs.h>
#include <X11/Shell.h>
#include <X11/XKBlib.h>

#ifdef USE_XINERAMA
# include <X11/extensions/Xinerama.h>
#endif

#include "dm.h"
#include "dm_error.h"
#include "greet.h"
#include "LoginP.h"

#if defined(HAVE_OPENLOG) && defined(HAVE_SYSLOG_H)
# define USE_SYSLOG
# include <syslog.h>
# ifndef LOG_AUTHPRIV
#  define LOG_AUTHPRIV LOG_AUTH
# endif
# ifndef LOG_PID
#  define LOG_PID 0
# endif
#endif

#include <string.h>

#if defined(SECURE_RPC) && defined(sun)
/* Go figure, there's no getdomainname() prototype available */
extern int getdomainname(char *name, size_t len);
#endif

/*
 * Function pointers filled in by the initial call ito the library
 */

int     (*__xdm_PingServer)(struct display *d, Display *alternateDpy) = NULL;
void    (*__xdm_SessionPingFailed)(struct display *d) = NULL;
void    (*__xdm_Debug)(const char * fmt, ...) = NULL;
void    (*__xdm_RegisterCloseOnFork)(int fd) = NULL;
void    (*__xdm_SecureDisplay)(struct display *d, Display *dpy) = NULL;
void    (*__xdm_UnsecureDisplay)(struct display *d, Display *dpy) = NULL;
void    (*__xdm_ClearCloseOnFork)(int fd) = NULL;
void    (*__xdm_SetupDisplay)(struct display *d) = NULL;
void    (*__xdm_LogError)(const char * fmt, ...) = NULL;
void    (*__xdm_SessionExit)(struct display *d, int status, int removeAuth) = NULL;
void    (*__xdm_DeleteXloginResources)(struct display *d, Display *dpy) = NULL;
int     (*__xdm_source)(char **environ, char *file) = NULL;
char    **(*__xdm_defaultEnv)(void) = NULL;
char    **(*__xdm_setEnv)(char **e, const char *name, const char *value) = NULL;
char    **(*__xdm_putEnv)(const char *string, char **env) = NULL;
char    **(*__xdm_parseArgs)(char **argv, const char *string) = NULL;
void    (*__xdm_printEnv)(char **e) = NULL;
char    **(*__xdm_systemEnv)(struct display *d, char *user, char *home) = NULL;
void    (*__xdm_LogOutOfMem)(const char * fmt, ...) = NULL;
void    (*__xdm_setgrent)(void) = NULL;
struct group    *(*__xdm_getgrent)(void) = NULL;
void    (*__xdm_endgrent)(void) = NULL;
# ifdef HAVE_GETSPNAM
struct spwd   *(*__xdm_getspnam)(GETSPNAM_ARGS) = NULL;
void   (*__xdm_endspent)(void) = NULL;
# endif
struct passwd   *(*__xdm_getpwnam)(GETPWNAM_ARGS) = NULL;
# if defined(linux) || defined(__GLIBC__)
void   (*__xdm_endpwent)(void) = NULL;
# endif
char     *(*__xdm_crypt)(CRYPT_ARGS) = NULL;
# ifdef USE_PAM
pam_handle_t **(*__xdm_thepamhp)(void) = NULL;
# endif

#ifdef SECURE_RPC
# include <rpc/rpc.h>
# include <rpc/key_prot.h>
#endif

#ifdef K5AUTH
# include <krb5/krb5.h>
#endif

static int	done, code;
#ifndef USE_PAM
static char	name[NAME_LEN], password[PASSWORD_LEN];
#endif
static Widget		toplevel;
static Widget		login;
static XtAppContext	context;
static XtIntervalId	pingTimeout;

#ifdef USE_PAM

#ifdef __sun
/* Solaris does not const qualify arguments to pam_get_item() or the
   PAM conversation function that Linux-PAM and others do. */
# define XDM_PAM_QUAL /**/
#else
# define XDM_PAM_QUAL const
#endif

static int pamconv(int num_msg, XDM_PAM_QUAL struct pam_message **msg,
		   struct pam_response **response, void *appdata_ptr);

# define PAM_ERROR_PRINT(pamfunc, pamh)	\
	LogError("%s failure: %s\n", pamfunc, pam_strerror(pamh, pam_error))


struct myconv_data {
    struct display *d;
    struct greet_info *greet;
    char *username_display;
};
#endif


/*ARGSUSED*/
static void
GreetPingServer (
    XtPointer	    closure,
    XtIntervalId    *intervalId)
{
    struct display *d;

    d = (struct display *) closure;
    if (!PingServer (d, XtDisplay (toplevel)))
	SessionPingFailed (d);
    pingTimeout = XtAppAddTimeOut (context, d->pingInterval * 60 * 1000,
				   GreetPingServer, (closure));
}

/*ARGSUSED*/
static void
GreetDone (
    Widget	w,
    LoginData	*data,
    int		status)
{
    Debug ("GreetDone: %s, (password is %zu long)\n",
	    data->name, strlen (data->passwd));
    switch (status) {
    case NOTIFY_OK:
#ifndef USE_PAM
	strncpy (name, data->name, sizeof(name));
	name[sizeof(name)-1] = '\0';
	strncpy (password, data->passwd, sizeof(password));
	password[sizeof(password)-1] = '\0';
#endif
	code = 0;
	done = 1;
	break;
    case NOTIFY_ABORT:
	Debug ("RESERVER_DISPLAY\n");
	code = RESERVER_DISPLAY;
	done = 1;
	break;
    case NOTIFY_RESTART:
	Debug ("REMANAGE_DISPLAY\n");
	code = REMANAGE_DISPLAY;
	done = 1;
	break;
    case NOTIFY_ABORT_DISPLAY:
	Debug ("UNMANAGE_DISPLAY\n");
	code = UNMANAGE_DISPLAY;
	done = 1;
	break;
    }
#ifndef USE_PAM
    if (done) {
	bzero (data->name, NAME_LEN);
	bzero (data->passwd, PASSWORD_LEN);
    }
#endif
}

static Display *
InitGreet (struct display *d)
{
    Arg		arglist[10];
    int		i;
    static int	argc;
    Screen		*scrn;
    static char	*argv[] = { "xlogin", NULL };
    Display		*dpy;
#ifdef USE_XINERAMA
    XineramaScreenInfo *screens;
    int                 s_num;
#endif

    Debug ("greet %s\n", d->name);
    argc = 1;
    XtToolkitInitialize ();
    context = XtCreateApplicationContext();
    dpy = XtOpenDisplay (context, d->name, "xlogin", "Xlogin", NULL, 0,
			 &argc, argv);

    if (!dpy)
	return NULL;

#ifdef XKB
    {
    int opcode, evbase, errbase, majret, minret;
    unsigned int value = XkbPCF_GrabsUseXKBStateMask;
    if (XkbQueryExtension (dpy, &opcode, &evbase, &errbase, &majret, &minret)) {
	if (!XkbSetPerClientControls (dpy, XkbPCF_GrabsUseXKBStateMask, &value))
	    LogError ("%s\n", "SetPerClientControls failed");
    }
    }
#endif
    RegisterCloseOnFork (ConnectionNumber (dpy));

    SecureDisplay (d, dpy);

    i = 0;
    scrn = XDefaultScreenOfDisplay(dpy);
    XtSetArg(arglist[i], XtNscreen, scrn);	i++;
    XtSetArg(arglist[i], XtNargc, argc);	i++;
    XtSetArg(arglist[i], XtNargv, argv);	i++;

    toplevel = XtAppCreateShell ((String) NULL, "Xlogin",
		    applicationShellWidgetClass, dpy, arglist, i);

    i = 0;
    XtSetArg (arglist[i], XtNnotifyDone, (XtPointer)GreetDone); i++;
    if (!d->authorize || d->authorizations || !d->authComplain)
    {
	XtSetArg (arglist[i], XtNsecureSession, True); i++;
    }
    login = XtCreateManagedWidget ("login", loginWidgetClass, toplevel,
				    arglist, i);
    XtRealizeWidget (toplevel);

#ifdef USE_XINERAMA
    if (
	XineramaIsActive(dpy) &&
	(screens = XineramaQueryScreens(dpy, &s_num)) != NULL
       )
    {
	XWarpPointer(dpy, None, XRootWindowOfScreen (scrn),
			0, 0, 0, 0,
			screens[0].x_org + screens[0].width / 2,
			screens[0].y_org + screens[0].height / 2);

	XFree(screens);
    }
    else
#endif
    XWarpPointer(dpy, None, XRootWindowOfScreen (scrn),
		    0, 0, 0, 0,
		    XWidthOfScreen(scrn) / 2,
		    XHeightOfScreen(scrn) / 2);

    if (d->pingInterval)
    {
	pingTimeout = XtAppAddTimeOut (context, d->pingInterval * 60 * 1000,
				       GreetPingServer, (XtPointer) d);
    }
    return dpy;
}

static void
CloseGreet (struct display *d)
{
    Boolean	    allow;
    Arg	    arglist[1];
    Display *dpy = XtDisplay(toplevel);

    if (pingTimeout)
    {
	XtRemoveTimeOut (pingTimeout);
	pingTimeout = 0;
    }
    UnsecureDisplay (d, dpy);
    XtSetArg (arglist[0], XtNallowAccess, (char *) &allow);
    XtGetValues (login, arglist, 1);
    if (allow)
    {
	Debug ("Disabling access control\n");
	XSetAccessControl (dpy, DisableAccess);
    }
    XtDestroyWidget (toplevel);
    toplevel = NULL;
    login = NULL; /* child of toplevel, which we just destroyed */
    ClearCloseOnFork (XConnectionNumber (dpy));
    XCloseDisplay (dpy);
    Debug ("Greet connection closed\n");
}

#define WHITESPACE 0
#define ARGUMENT 1

static int
Greet (struct display *d, struct greet_info *greet)
{
    XEvent		event;
    Arg		arglist[1];

    XtSetArg (arglist[0], XtNallowAccess, False);
    XtSetValues (login, arglist, 1);

    Debug ("dispatching %s\n", d->name);
    done = 0;
    while (!done) {
	XtAppNextEvent (context, &event);
	switch (event.type) {
	case MappingNotify:
	    XRefreshKeyboardMapping(&event.xmapping);
	    break;
	default:
	    XtDispatchEvent (&event);
	    break;
	}
    }
    XFlush (XtDisplay (toplevel));
    Debug ("Done dispatch %s\n", d->name);
    if (code == 0)
    {
#ifndef USE_PAM
	char *ptr;
	unsigned int c,state = WHITESPACE;

	/*
	 * Process the name string to get rid of white spaces.
	 */
	for (ptr = name; state == WHITESPACE; ptr++)
	{
	    c = (unsigned int)(*ptr);
	    if (c == ' ')
		continue;

	    state = ARGUMENT;
	    break;
	}

	greet->name = ptr;
	greet->password = password;
#endif  /* USE_PAM */
	XtSetArg (arglist[0], XtNsessionArgument, (char *) &(greet->string));
	XtGetValues (login, arglist, 1);
	Debug ("sessionArgument: %s\n", greet->string ? greet->string : "<NULL>");
    }
    return code;
}


static void
FailedLogin (struct display *d, const char *username)
{
#ifdef USE_SYSLOG
    if (username == NULL)
	username = "username unavailable";

    syslog(LOG_AUTHPRIV|LOG_NOTICE,
	   "LOGIN FAILURE ON %s, %s",
	   d->name, username);
#endif
    DrawFail (login);
}

_X_EXPORT
greet_user_rtn GreetUser(
    struct display          *d,
    Display                 ** dpy,
    struct verify_info      *verify,
    struct greet_info       *greet,
    struct dlfuncs        *dlfuncs)
{
    int i;
    Arg		arglist[2];

/*
 * These must be set before they are used.
 */
    __xdm_PingServer = dlfuncs->_PingServer;
    __xdm_SessionPingFailed = dlfuncs->_SessionPingFailed;
    __xdm_Debug = dlfuncs->_Debug;
    __xdm_RegisterCloseOnFork = dlfuncs->_RegisterCloseOnFork;
    __xdm_SecureDisplay = dlfuncs->_SecureDisplay;
    __xdm_UnsecureDisplay = dlfuncs->_UnsecureDisplay;
    __xdm_ClearCloseOnFork = dlfuncs->_ClearCloseOnFork;
    __xdm_SetupDisplay = dlfuncs->_SetupDisplay;
    __xdm_LogError = dlfuncs->_LogError;
    __xdm_SessionExit = dlfuncs->_SessionExit;
    __xdm_DeleteXloginResources = dlfuncs->_DeleteXloginResources;
    __xdm_source = dlfuncs->_source;
    __xdm_defaultEnv = dlfuncs->_defaultEnv;
    __xdm_setEnv = dlfuncs->_setEnv;
    __xdm_putEnv = dlfuncs->_putEnv;
    __xdm_parseArgs = dlfuncs->_parseArgs;
    __xdm_printEnv = dlfuncs->_printEnv;
    __xdm_systemEnv = dlfuncs->_systemEnv;
    __xdm_LogOutOfMem = dlfuncs->_LogOutOfMem;
    __xdm_setgrent = dlfuncs->_setgrent;
    __xdm_getgrent = dlfuncs->_getgrent;
    __xdm_endgrent = dlfuncs->_endgrent;
# ifdef HAVE_GETSPNAM
    __xdm_getspnam = dlfuncs->_getspnam;
    __xdm_endspent = dlfuncs->_endspent;
# endif
    __xdm_getpwnam = dlfuncs->_getpwnam;
# if defined(linux) || defined(__GLIBC__)
    __xdm_endpwent = dlfuncs->_endpwent;
# endif
    __xdm_crypt = dlfuncs->_crypt;
# ifdef USE_PAM
    __xdm_thepamhp = dlfuncs->_thepamhp;
# endif

    *dpy = InitGreet (d);
    /*
     * Run the setup script - note this usually will not work when
     * the server is grabbed, so we don't even bother trying.
     */
    if (!d->grabServer)
	SetupDisplay (d);
    if (!*dpy) {
	LogError ("Cannot reopen display %s for greet window\n", d->name);
	exit (RESERVER_DISPLAY);
    }

    XtSetArg (arglist[0], XtNallowNullPasswd,
	      (char *) &(greet->allow_null_passwd));
    XtSetArg (arglist[1], XtNallowRootLogin,
	      (char *) &(greet->allow_root_login));
    XtGetValues (login, arglist, 2);

    for (;;) {
#ifdef USE_PAM

	/* Run PAM conversation */
	pam_handle_t 	**pamhp		= thepamhp();
	int		  pam_error;
	unsigned int	  pam_flags 	= 0;
	struct myconv_data pcd		= { d, greet, NULL };
	struct pam_conv   pc 		= { pamconv, &pcd };
	const char *	  pam_fname;
	const char *	  login_prompt;


	SetPrompt(login, LOGIN_PROMPT_USERNAME, NULL, LOGIN_PROMPT_NOT_SHOWN, False);
	login_prompt  = GetPrompt(login, LOGIN_PROMPT_USERNAME);
	SetPrompt(login, LOGIN_PROMPT_PASSWORD, NULL, LOGIN_PROMPT_NOT_SHOWN, False);

# define RUN_AND_CHECK_PAM_ERROR(function, args)			\
	    do { 						\
		pam_error = function args;			\
		if (pam_error != PAM_SUCCESS) {			\
		    PAM_ERROR_PRINT(#function, *pamhp);		\
		    goto pam_done;				\
		} 						\
	    } while (0)


	RUN_AND_CHECK_PAM_ERROR(pam_start,
				("xdm", NULL, &pc, pamhp));

	/* Set default login prompt to xdm's default from Xresources */
	if (login_prompt != NULL) {
	    RUN_AND_CHECK_PAM_ERROR(pam_set_item,
				    (*pamhp, PAM_USER_PROMPT, login_prompt));
	}

	if (d->name[0] != ':') {	/* Displaying to remote host */
	    char *hostname = strdup(d->name);

	    if (hostname == NULL) {
		LogOutOfMem("GreetUser");
	    } else {
		char *colon = strrchr(hostname, ':');

		if (colon != NULL)
		    *colon = '\0';

		RUN_AND_CHECK_PAM_ERROR(pam_set_item,
					(*pamhp, PAM_RHOST, hostname));
		free(hostname);
	    }
	} else {			/* Displaying on local host */
	    const char *ttyname = NULL;

#ifdef __sun
	    /* Solaris PAM & auditing insist this is a device file that can
	       be found under /dev, so we can't use the display name */
	    char vtpath[16];

	    if ((d->windowPath) && !(strchr(d->windowPath, ':'))) {
		/* if path is simply a VT, with no intermediaries, use it */
		snprintf(vtpath, sizeof(vtpath), "/dev/vt/%s", d->windowPath);
		ttyname = vtpath;
	    }
#else
	    /* On all other OS'es we just pass the display name for PAM_TTY */
	    ttyname = d->name;
#endif
	    RUN_AND_CHECK_PAM_ERROR(pam_set_item, (*pamhp, PAM_TTY, ttyname));
	}

	if (!greet->allow_null_passwd) {
	    pam_flags |= PAM_DISALLOW_NULL_AUTHTOK;
	}
	RUN_AND_CHECK_PAM_ERROR(pam_authenticate,
				(*pamhp, pam_flags));

	/* handle expired passwords */
	pam_error = pam_acct_mgmt(*pamhp, pam_flags);
	pam_fname = "pam_acct_mgmt";
	if (pam_error == PAM_NEW_AUTHTOK_REQD) {
	    ShowChangePasswdMessage(login);
	    do {
		pam_error = pam_chauthtok(*pamhp, PAM_CHANGE_EXPIRED_AUTHTOK);
	    } while ((pam_error == PAM_AUTHTOK_ERR) ||
		     (pam_error == PAM_TRY_AGAIN));
	    pam_fname = "pam_chauthtok";
	}
	if (pam_error != PAM_SUCCESS) {
	    PAM_ERROR_PRINT(pam_fname, *pamhp);
	    goto pam_done;
	}

	RUN_AND_CHECK_PAM_ERROR(pam_setcred,
				(*pamhp, 0));
	{
	    char *username	= NULL;

	    RUN_AND_CHECK_PAM_ERROR(pam_get_item,
                                    (*pamhp, PAM_USER,
                                     (XDM_PAM_QUAL void **) &username));
	    if (username != NULL) {
		Debug("PAM_USER: %s\n", username);
		greet->name = username;
		greet->password = NULL;
	    }
	}

      pam_done:
	if (code != 0)
	{
	    CloseGreet (d);
	    SessionExit (d, code, FALSE);
	}
	if ((pam_error == PAM_SUCCESS) && (Verify (d, greet, verify))) {
	    SetPrompt (login, 1, "Login Successful", LOGIN_TEXT_INFO, False);
	    SetValue (login, 1, NULL);
	    break;
	} else {
	    /* Try to fill in username for failed login error log */
	    XDM_PAM_QUAL char *username = greet->name;

	    if (username == NULL) {
		RUN_AND_CHECK_PAM_ERROR(pam_get_item,
					(*pamhp, PAM_USER,
					 (XDM_PAM_QUAL void **) &username));
	    }
	    FailedLogin (d, username);
	    RUN_AND_CHECK_PAM_ERROR(pam_end,
				    (*pamhp, pam_error));
	}
#else /* not PAM */
	/*
	 * Greet user, requesting name/password
	 */
	code = Greet (d, greet);
	if (code != 0)
	{
	    CloseGreet (d);
	    SessionExit (d, code, FALSE);
	}
	/*
	 * Verify user
	 */
	if (Verify (d, greet, verify))
	    break;
	else
	{
	    FailedLogin (d, greet->name);
	    bzero (greet->name, strlen(greet->name));
	    bzero (greet->password, strlen(greet->password));
	}
#endif
    }
    DeleteXloginResources (d, *dpy);
    CloseGreet (d);
    Debug ("Greet loop finished\n");
    /*
     * Run system-wide initialization file
     */
    if (source (verify->systemEnviron, d->startup) != 0)
    {
	Debug ("Startup program %s exited with non-zero status\n",
		d->startup);
	SessionExit (d, OBEYSESS_DISPLAY, FALSE);
    }
    /*
     * for user-based authorization schemes,
     * add the user to the server's allowed "hosts" list.
     */
    for (i = 0; i < d->authNum; i++)
    {
#ifdef SECURE_RPC
	if (d->authorizations[i]->name_length == 9 &&
	    memcmp(d->authorizations[i]->name, "SUN-DES-1", 9) == 0)
	{
	    XHostAddress	addr;
	    char		netname[MAXNETNAMELEN+1];
	    char		domainname[MAXNETNAMELEN+1];

	    getdomainname(domainname, sizeof domainname);
	    user2netname (netname, verify->uid, domainname);
	    addr.family = FamilyNetname;
	    addr.length = strlen (netname);
	    addr.address = netname;
	    XAddHost (*dpy, &addr);
	}
#endif
#ifdef K5AUTH
	if (d->authorizations[i]->name_length == 14 &&
	    memcmp(d->authorizations[i]->name, "MIT-KERBEROS-5", 14) == 0)
	{
	    /* Update server's auth file with user-specific info.
	     * Don't need to AddHost because X server will do that
	     * automatically when it reads the cache we are about
	     * to point it at.
	     */
	    extern Xauth *Krb5GetAuthFor();

	    XauDisposeAuth (d->authorizations[i]);
	    d->authorizations[i] =
		Krb5GetAuthFor(14, "MIT-KERBEROS-5", d->name);
	    SaveServerAuthorizations (d, d->authorizations, d->authNum);
	}
#endif
    }

    return Greet_Success;
}


#ifdef USE_PAM
static int pamconv(int num_msg, XDM_PAM_QUAL struct pam_message **msg,
		   struct pam_response **response, void *appdata_ptr)
{
    int i;
    int greetCode;
    int status = PAM_SUCCESS;
    const char *pam_msg_styles[5]
	= { "<invalid pam msg style>",
	    "PAM_PROMPT_ECHO_OFF", "PAM_PROMPT_ECHO_ON",
	    "PAM_ERROR_MSG", "PAM_TEXT_INFO" } ;

    struct pam_message      *m;
    struct pam_response     *r;

    struct myconv_data	    *d = (struct myconv_data *) appdata_ptr;

    pam_handle_t	    **pamhp = thepamhp();

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

    m = (struct pam_message *)*msg;
    r = *response;

    if (login == NULL) {
	status = PAM_CONV_ERR;
	goto pam_error;
    }

    for (i = 0; i < num_msg; i++ , m++ , r++) {
	XDM_PAM_QUAL char *username;
	int promptId = 0;
	loginPromptState pStyle = LOGIN_PROMPT_ECHO_OFF;

	if ((pam_get_item(*pamhp, PAM_USER, (XDM_PAM_QUAL void **) &username)
             == PAM_SUCCESS) && (username != NULL) && (*username != '\0')) {
	    SetPrompt(login, LOGIN_PROMPT_USERNAME,
		      NULL, LOGIN_TEXT_INFO, False);
	    SetValue(login, LOGIN_PROMPT_USERNAME, username);
	    promptId = 1;
	}

	Debug("pam_msg: %s (%d): '%s'\n",
	      ((m->msg_style > 0) && (m->msg_style <= 4)) ?
	       pam_msg_styles[m->msg_style] : pam_msg_styles[0],
	       m->msg_style, m->msg);

	switch (m->msg_style) {
	  case PAM_ERROR_MSG:
	      ErrorMessage(login, m->msg, True);
	      break;

	  case PAM_TEXT_INFO:
	      SetPrompt (login, promptId, m->msg, LOGIN_TEXT_INFO, True);
	      SetValue (login, promptId, NULL);
	      break;

          case PAM_PROMPT_ECHO_ON:
	      pStyle = LOGIN_PROMPT_ECHO_ON;
	      /* FALLTHROUGH */
          case PAM_PROMPT_ECHO_OFF:
	      SetPrompt (login, promptId, m->msg, pStyle, False);
	      SetValue (login, promptId, NULL);
	      greetCode = Greet (d->d, d->greet);
	      if (greetCode != 0) {
		  status = PAM_CONV_ERR;
		  goto pam_error;
	      } else {
		  r->resp = strdup(GetValue(login, promptId));
		  SetValue(login, promptId, NULL);
		  if (r->resp == NULL) {
		      status = PAM_BUF_ERR;
		      goto pam_error;
		  }
		  /* Debug("pam_resp: '%s'\n", r->resp); */
	      }
	      break;

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