121 lines
3.8 KiB
C
121 lines
3.8 KiB
C
/* $NetBSD: pam_guest.c,v 1.2 2004/12/12 08:18:45 christos Exp $ */
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/*-
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* Copyright (c) 2003 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* Portions of this software were developed for the FreeBSD Project by
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* ThinkSec AS and NAI Labs, the Security Research Division of Network
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* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
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* ("CBOSS"), as part of the DARPA CHATS research program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifdef __FreeBSD__
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__FBSDID("$FreeBSD: src/lib/libpam/modules/pam_guest/pam_guest.c,v 1.1 2003/05/31 16:52:58 des Exp $");
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#else
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__RCSID("$NetBSD: pam_guest.c,v 1.2 2004/12/12 08:18:45 christos Exp $");
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#endif
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#include <string.h>
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#define PAM_SM_AUTH
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#include <security/pam_appl.h>
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#include <security/pam_modules.h>
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#include <security/openpam.h>
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#define DEFAULT_GUESTS "guest"
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static int
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lookup(const char *str, const char *list)
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{
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const char *next;
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size_t len;
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len = strlen(str);
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while (*list != '\0') {
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while (*list == ',')
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++list;
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if ((next = strchr(list, ',')) == NULL)
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next = strchr(list, '\0');
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if (next - list == (ptrdiff_t)len &&
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strncmp(list, str, len) == 0)
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return (1);
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list = next;
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}
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return (0);
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}
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PAM_EXTERN int
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pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
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int argc __unused, const char *argv[] __unused)
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{
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const char *authtok, *guests, *user;
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int err, is_guest;
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/* get target account */
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if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || user == NULL)
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return (PAM_AUTH_ERR);
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/* get list of guest logins */
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if ((guests = openpam_get_option(pamh, "guests")) == NULL)
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guests = DEFAULT_GUESTS;
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/* check if the target account is on the list */
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is_guest = lookup(user, guests);
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/* check password */
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if (!openpam_get_option(pamh, "nopass")) {
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err = pam_get_authtok(pamh, PAM_AUTHTOK, &authtok, NULL);
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if (err != PAM_SUCCESS)
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return (err);
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if (openpam_get_option(pamh, "pass_is_user") &&
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strcmp(user, authtok) != 0)
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return (PAM_AUTH_ERR);
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if (openpam_get_option(pamh, "pass_as_ruser"))
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pam_set_item(pamh, PAM_RUSER, authtok);
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}
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/* done */
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if (is_guest) {
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pam_setenv(pamh, "GUEST", user, 1);
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return (PAM_SUCCESS);
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}
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return (PAM_AUTH_ERR);
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}
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PAM_EXTERN int
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pam_sm_setcred(pam_handle_t * pamh __unused, int flags __unused,
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int argc __unused, const char *argv[] __unused)
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{
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return (PAM_SUCCESS);
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}
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PAM_MODULE_ENTRY("pam_guest");
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