/* $NetBSD: pam_group.c,v 1.12 2009/03/08 19:38:03 christos Exp $ */
/*-
* Copyright (c) 2003 Networks Associates Technology, Inc.
* All rights reserved.
*
* Portions of this software were developed for the FreeBSD Project by
* ThinkSec AS and NAI Labs, the Security Research Division of Network
* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
* ("CBOSS"), as part of the DARPA CHATS research program.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifdef __FreeBSD__
__FBSDID("$FreeBSD: src/lib/libpam/modules/pam_group/pam_group.c,v 1.4 2003/12/11 13:55:15 des Exp $");
#else
__RCSID("$NetBSD: pam_group.c,v 1.12 2009/03/08 19:38:03 christos Exp $");
#endif
#include <sys/types.h>
#include <grp.h>
#include <pwd.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <login_cap.h>
#define PAM_SM_AUTH
#include <security/pam_appl.h>
#include <security/pam_modules.h>
#include <security/pam_mod_misc.h>
#include <security/openpam.h>
static int authenticate(pam_handle_t *, struct passwd *, int);
#define PASSWORD_PROMPT "%s's password:"
PAM_EXTERN int
pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
int argc __unused, const char *argv[] __unused)
{
const char *group, *user;
const void *ruser;
char *const *list;
struct passwd *pwd, pwres;
struct group *grp, grres;
int pam_err, auth;
char *promptresp = NULL;
char pwbuf[1024];
char grbuf[1024];
/* get target account */
if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS ||
user == NULL ||
getpwnam_r(user, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 ||
pwd == NULL)
return (PAM_AUTH_ERR);
if (pwd->pw_uid != 0 && openpam_get_option(pamh, "root_only"))
return (PAM_IGNORE);
/* get applicant */
if (pam_get_item(pamh, PAM_RUSER, &ruser) != PAM_SUCCESS ||
ruser == NULL ||
getpwnam_r(ruser, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 ||
pwd == NULL)
return (PAM_AUTH_ERR);
auth = openpam_get_option(pamh, "authenticate") != NULL;
/* get regulating group */
if ((group = openpam_get_option(pamh, "group")) == NULL)
group = "wheel";
if (getgrnam_r(group, &grres, grbuf, sizeof(grbuf), &grp) != 0 ||
grp == NULL || grp->gr_mem == NULL)
goto failed;
/* check if the group is empty */
if (*grp->gr_mem == NULL)
goto failed;
/* check membership */
if (pwd->pw_gid == grp->gr_gid)
goto found;
for (list = grp->gr_mem; *list != NULL; ++list)
if (strcmp(*list, pwd->pw_name) == 0)
goto found;
not_found:
if (openpam_get_option(pamh, "deny"))
return (PAM_SUCCESS);
if (!auth) {
pam_err = pam_prompt(pamh, PAM_ERROR_MSG, &promptresp,
"%s: You are not listed in the correct secondary group"
" (%s) to %s %s.", getprogname(), group, getprogname(),
user);
if (pam_err == PAM_SUCCESS && promptresp)
free(promptresp);
}
return (PAM_AUTH_ERR);
found:
if (auth)
if ((pam_err = authenticate(pamh, pwd, flags)) != PAM_SUCCESS)
return pam_err;
if (openpam_get_option(pamh, "deny"))
return (PAM_AUTH_ERR);
return (PAM_SUCCESS);
failed:
if (openpam_get_option(pamh, "fail_safe"))
goto found;
else
goto not_found;
}
PAM_EXTERN int
pam_sm_setcred(pam_handle_t * pamh __unused, int flags __unused,
int argc __unused, const char *argv[] __unused)
{
return (PAM_SUCCESS);
}
static int
authenticate(pam_handle_t *pamh, struct passwd *pwd, int flags)
{
int retval;
login_cap_t *lc;
const char *pass;
char password_prompt[80];
(void) snprintf(password_prompt, sizeof(password_prompt),
PASSWORD_PROMPT, pwd->pw_name);
lc = login_getpwclass(pwd);
retval = pam_get_authtok(pamh, PAM_AUTHTOK, &pass, password_prompt);
login_close(lc);
if (retval != PAM_SUCCESS)
return retval;
PAM_LOG("Got password");
if (strcmp(crypt(pass, pwd->pw_passwd), pwd->pw_passwd) == 0)
return PAM_SUCCESS;
PAM_VERBOSE_ERROR("UNIX authentication refused");
return PAM_AUTH_ERR;
}
PAM_MODULE_ENTRY("pam_group");
