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/* GDM - The Gnome Display Manager
* Copyright (C) 1998, 1999 Martin Kasper Petersen <mkp@mkp.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <syslog.h>
#include <pwd.h>
#include <glib.h>
#include <crypt.h>
#include <config.h>
#include <gnome.h>
#ifdef HAVE_PAM
#include <security/pam_appl.h>
#endif /* HAVE_PAM */
#ifdef HAVE_SHADOW
#include <shadow.h>
#endif /* HAVE_SHADOW */
#include "gdm.h"
static const gchar RCSid[]="$Id$";
extern void gdm_abort (const char*, ...);
extern void gdm_debug (const char*, ...);
extern void gdm_error (const char*, ...);
extern gchar *gdm_slave_greeter_ctl (gchar cmd, gchar *str);
extern gboolean GdmVerboseAuth;
extern gboolean GdmAllowRoot;
gchar *gdm_verify_user (gchar *display);
void gdm_verify_cleanup (void);
#ifdef HAVE_PAM
pam_handle_t *pamh;
static gint
gdm_verify_pam_conv (int num_msg, const struct pam_message **msg,
struct pam_response **resp,
void *appdata_ptr)
{
gint replies = 0;
struct pam_response *reply = NULL;
gchar *s;
reply = g_new0 (struct pam_response, num_msg);
if (!reply)
return PAM_CONV_ERR;
for (replies = 0; replies < num_msg; replies++) {
switch (msg[replies]->msg_style) {
case PAM_PROMPT_ECHO_ON:
s = gdm_slave_greeter_ctl (GDM_PROMPT, (gchar *) msg[replies]->msg);
reply[replies].resp_retcode = PAM_SUCCESS;
reply[replies].resp = g_strdup (s);
g_free (s);
break;
case PAM_PROMPT_ECHO_OFF:
s = gdm_slave_greeter_ctl (GDM_NOECHO, (gchar *) msg[replies]->msg);
reply[replies].resp_retcode = PAM_SUCCESS;
reply[replies].resp = g_strdup (s);
g_free (s);
break;
case PAM_ERROR_MSG:
case PAM_TEXT_INFO:
gdm_slave_greeter_ctl (GDM_MSGERR, (gchar *) msg[replies]->msg);
reply[replies].resp_retcode = PAM_SUCCESS;
reply[replies].resp = NULL;
break;
default:
g_free (reply);
return (PAM_CONV_ERR);
}
}
*resp = reply;
return (PAM_SUCCESS);
}
static struct pam_conv pamc = {
&gdm_verify_pam_conv,
NULL
};
gchar *
gdm_verify_user (gchar *display)
{
gint pamerr, i;
gchar *login;
gchar **pamenv;
struct passwd *pwent;
login = gdm_slave_greeter_ctl (GDM_PROMPT, _("Login:"));
if (!login)
return (NULL);
pwent = getpwnam (login);
if (!pwent) {
gdm_error (_("Couldn't authenticate %s"), login);
if (GdmVerboseAuth)
gdm_slave_greeter_ctl (GDM_MSGERR, _("User unknown"));
return (NULL);
}
if (GdmAllowRoot && pwent->pw_uid == 0) {
gdm_error (_("Root login disallowed on display '%s'"), display);
if (GdmVerboseAuth)
gdm_slave_greeter_ctl (GDM_MSGERR, _("Root login disallowed"));
return (NULL);
}
if ((pamerr = pam_start ("gdm", login, &pamc, &pamh)) != PAM_SUCCESS) {
gdm_error (_("Can't find /etc/pam.d/gdm!"));
}
if ((pamerr = pam_set_item (pamh, PAM_TTY, display)) != PAM_SUCCESS) {
gdm_error (_("Can't set PAM_TTY=%s"), ":0");
goto pamerr;
}
if ((pamerr = pam_authenticate (pamh, 0)) != PAM_SUCCESS) {
gdm_error (_("Couldn't authenticate %s"), login);
goto pamerr;
}
if ((pamerr = pam_acct_mgmt (pamh, 0)) != PAM_SUCCESS) {
gdm_error (_("Couldn't set acct. mgmt for %s"), login);
goto pamerr;
}
if ((pamerr = pam_setcred (pamh, 0)) != PAM_SUCCESS) {
gdm_error (_("Couldn't set credentials for %s"), login);
goto pamerr;
}
if ((pamerr = pam_open_session (pamh, 0)) != PAM_SUCCESS) {
gdm_error (_("Couldn't open session for %s"), login);
goto pamerr;
}
if ((pamenv = pam_getenvlist (pamh))) {
for (i = 0 ; pamenv[i] ; i++) {
putenv (pamenv[i]);
}
}
return (login);
pamerr:
if (GdmVerboseAuth)
gdm_slave_greeter_ctl (GDM_MSGERR, (gchar *) pam_strerror (pamh, pamerr));
pam_end (pamh, pamerr);
pamh = NULL;
/* Workaround to avoid gdm messages being logged as PAM_pwdb */
closelog();
openlog ("gdm", LOG_PID, LOG_DAEMON);
return (NULL);
}
#else /* HAVE_PAM */
gchar *
gdm_verify_user (gchar *display)
{
gchar *login, *passwd, *ppasswd;
struct passwd *pwent;
#ifdef HAVE_SHADOW
struct spwd *sp;
#endif
login = gdm_slave_greeter_ctl (GDM_PROMPT, _("Login:"));
pwent = getpwnam (login);
if (!pwent) {
gdm_error (_("Couldn't authenticate %s"), login);
if (GdmVerboseAuth)
gdm_slave_greeter_ctl (GDM_MSGERR, _("User unknown"));
return (NULL);
}
if (GdmAllowRoot && pwent->pw_uid == 0) {
gdm_error (_("Root login disallowed on display '%s'"), display);
if (GdmVerboseAuth)
gdm_slave_greeter_ctl (GDM_MSGERR, _("Root login disallowed"));
return (NULL);
}
ppasswd = !pwent ? NULL : pwent->pw_passwd;
#ifdef HAVE_SHADOW
sp = getspnam (login);
if (sp)
ppasswd = sp->sp_pwdp;
endspent();
#endif /* HAVE_SHADOW */
passwd = gdm_slave_greeter_ctl (GDM_NOECHO, _("Password:"));
if (!passwd || !ppasswd || strcmp (crypt (passwd, ppasswd), ppasswd)) {
if (GdmVerboseAuth)
gdm_slave_greeter_ctl (GDM_MSGERR, _("Incorrect password"));
return (NULL);
}
return (login);
}
#endif /* HAVE_PAM */
void
gdm_verify_cleanup (void)
{
#ifdef HAVE_PAM
gdm_debug ("gdm_verify_cleanup: Closing session %d", pamh);
if (pamh) {
pam_close_session (pamh, 0);
pam_end (pamh, PAM_SUCCESS);
pamh = NULL;
}
/* Workaround to avoid gdm messages being logged as PAM_pwdb */
closelog();
openlog ("gdm", LOG_PID, LOG_DAEMON);
#endif /* HAVE_PAM */
}
/* EOF */
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