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/* $Id: auth_helper_pam.c,v 1.9 2004/06/12 07:52:01 dm Exp $ */
/*
*
* Copyright (C) 2004 David Mazieres (dm@uun.org)
*
* 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, 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 "auth_helper.h"
#include "suio.h"
#ifdef HAVE_PAM_PAM_APPL_H
#include <pam/pam_appl.h>
#else /* !HAVE_PAM_PAM_APPL_H */
#include <security/pam_appl.h>
#endif /* !HAVE_PAM_PAM_APPL_H */
static suio *chatter;
static int conversed;
static int
rpc_conv (int num_msg, const struct pam_message **msg,
struct pam_response **resp, void *appdata_ptr)
{
struct pam_response *res = malloc (num_msg * sizeof (*res));
int i;
if (!res) {
const char msg[] = "malloc failed\n";
write (2, msg, sizeof (msg) - 1);
abort ();
}
#if !defined (__linux__) && !defined (__FreeBSD__)
if (num_msg > 1) {
fprintf (stderr, "%s(%s,%s): PAM conversation w. more than one message\n"
"Conservatively refusing to authenticate because "
"incompatibilities\n"
"in different OS APIs could lead to memory corruption\n",
progname, user, service);
exit (1);
}
#endif /* not linux or FreeBSD */
bzero (res, num_msg * sizeof (*res));
for (i = 0; i < num_msg; i++)
switch (msg[i]->msg_style) {
case PAM_PROMPT_ECHO_OFF:
case PAM_PROMPT_ECHO_ON:
{
char *text;
conversed = 1;
suio_copy (chatter, msg[i]->msg, strlen (msg[i]->msg));
suio_copy (chatter, "", 1);
text = suio_flatten (chatter);
suio_clear (chatter);
res[i].resp = authhelp_input (text,
msg[i]->msg_style == PAM_PROMPT_ECHO_ON);
xfree (text);
break;
}
case PAM_ERROR_MSG:
fprintf (stderr, "%s(%s,%s): %s\n", progname, service, user,
msg[i]->msg);
break;
case PAM_TEXT_INFO:
suio_copy (chatter, msg[i]->msg, strlen (msg[i]->msg));
suio_copy (chatter, "\n", 1);
break;
default:
fprintf (stderr, "%s(%s,%s): unsupported PAM message type %d\n",
progname, user, service, msg[i]->msg_style);
exit (1);
break;
}
*resp = res;
return PAM_SUCCESS;
}
int
authhelp_go (void)
{
pam_handle_t *pamh = NULL;
struct pam_conv conv;
int err;
char *u = NULL;
chatter = suio_alloc ();
bzero (&conv, sizeof (conv));
conv.conv = rpc_conv;
err = pam_start (service, user, &conv, &pamh);
if (!user)
user = "unknown user";
if (err == PAM_SUCCESS)
err = pam_authenticate (pamh, 0);
if (err == PAM_SUCCESS)
err = pam_acct_mgmt (pamh, 0);
if (err == PAM_SUCCESS) {
const void *vv;
pam_get_item (pamh, PAM_USER, &vv);
u = (char *) vv;
}
if (err == PAM_SUCCESS) {
char *text;
suio_copy (chatter, "", 1);
text = suio_flatten (chatter);
suio_clear (chatter);
authhelp_approve (u, text);
xfree (text);
}
else if (!conversed) {
fprintf (stderr, "%s PAM(%s): %s\n", progname,
service, pam_strerror (pamh, err));
if (!chdir ("/etc/pam.d") && access (service, F_OK))
fprintf (stderr, "%s PAM(%s): %s\n", progname, service,
"Try running: ln -s system-auth /etc/pam.d/sfs");
else
fprintf (stderr, "%s PAM(%s): make PAM config allows service %s"
" or other\n", progname, service, service);
}
#if 0
if (err == PAM_SUCCESS)
fprintf (stderr, "%s(%s,%s): authenticated %s\n", progname,
user, service, u);
else
fprintf (stderr, "%s(%s,%s): %s\n", progname,
user, service, pam_strerror (pamh, err));
#endif
pam_end (pamh, err);
return err == PAM_SUCCESS ? 0 : -1;
}
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