5e53a4f90f
Mainly focus on files that use BSD 2-Clause license, however the tool I was using mis-identified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
284 lines
7.8 KiB
C
284 lines
7.8 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright 1998 Juniper Networks, Inc.
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* All rights reserved.
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* Copyright (c) 2001-2003 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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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <pwd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <taclib.h>
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#include <unistd.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/pam_mod_misc.h>
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#define PAM_OPT_CONF "conf"
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#define PAM_OPT_TEMPLATE_USER "template_user"
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typedef int (*set_func)(struct tac_handle *, const char *);
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static int do_item(pam_handle_t *, struct tac_handle *, int,
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set_func, const char *);
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static char *get_msg(struct tac_handle *);
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static int set_msg(struct tac_handle *, const char *);
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static int
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do_item(pam_handle_t *pamh, struct tac_handle *tach, int item,
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set_func func, const char *funcname)
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{
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int retval;
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const void *value;
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retval = pam_get_item(pamh, item, &value);
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if (retval != PAM_SUCCESS)
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return retval;
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if (value != NULL && (*func)(tach, (const char *)value) == -1) {
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syslog(LOG_CRIT, "%s: %s", funcname, tac_strerror(tach));
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tac_close(tach);
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return PAM_SERVICE_ERR;
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}
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return PAM_SUCCESS;
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}
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static char *
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get_msg(struct tac_handle *tach)
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{
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char *msg;
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msg = tac_get_msg(tach);
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if (msg == NULL) {
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syslog(LOG_CRIT, "tac_get_msg: %s", tac_strerror(tach));
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tac_close(tach);
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return NULL;
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}
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return msg;
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}
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static int
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set_msg(struct tac_handle *tach, const char *msg)
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{
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if (tac_set_msg(tach, msg) == -1) {
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syslog(LOG_CRIT, "tac_set_msg: %s", tac_strerror(tach));
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tac_close(tach);
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return -1;
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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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int retval;
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struct tac_handle *tach;
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const char *conf_file, *template_user;
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conf_file = openpam_get_option(pamh, PAM_OPT_CONF);
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template_user = openpam_get_option(pamh, PAM_OPT_TEMPLATE_USER);
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tach = tac_open();
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if (tach == NULL) {
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syslog(LOG_CRIT, "tac_open failed");
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return (PAM_SERVICE_ERR);
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}
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if (tac_config(tach, conf_file) == -1) {
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syslog(LOG_ALERT, "tac_config: %s", tac_strerror(tach));
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tac_close(tach);
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return (PAM_SERVICE_ERR);
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}
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if (tac_create_authen(tach, TAC_AUTHEN_LOGIN, TAC_AUTHEN_TYPE_ASCII,
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TAC_AUTHEN_SVC_LOGIN) == -1) {
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syslog(LOG_CRIT, "tac_create_authen: %s", tac_strerror(tach));
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tac_close(tach);
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return (PAM_SERVICE_ERR);
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}
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PAM_LOG("Done tac_open() ... tac_close()");
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retval = do_item(pamh, tach, PAM_USER, tac_set_user, "tac_set_user");
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if (retval != PAM_SUCCESS)
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return (retval);
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PAM_LOG("Done user");
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retval = do_item(pamh, tach, PAM_TTY, tac_set_port, "tac_set_port");
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if (retval != PAM_SUCCESS)
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return (retval);
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PAM_LOG("Done tty");
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retval = do_item(pamh, tach, PAM_RHOST, tac_set_rem_addr,
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"tac_set_rem_addr");
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if (retval != PAM_SUCCESS)
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return (retval);
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for (;;) {
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char *srvr_msg;
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size_t msg_len;
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const char *user_msg;
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char *data_msg;
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int sflags;
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int status;
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sflags = tac_send_authen(tach);
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if (sflags == -1) {
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syslog(LOG_CRIT, "tac_send_authen: %s",
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tac_strerror(tach));
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tac_close(tach);
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return (PAM_AUTHINFO_UNAVAIL);
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}
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status = TAC_AUTHEN_STATUS(sflags);
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openpam_set_option(pamh, PAM_OPT_ECHO_PASS,
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TAC_AUTHEN_NOECHO(sflags) ? NULL : "");
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switch (status) {
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case TAC_AUTHEN_STATUS_PASS:
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tac_close(tach);
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if (template_user != NULL) {
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const void *item;
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const char *user;
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PAM_LOG("Trying template user: %s",
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template_user);
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/*
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* If the given user name doesn't exist in
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* the local password database, change it
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* to the value given in the "template_user"
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* option.
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*/
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retval = pam_get_item(pamh, PAM_USER, &item);
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if (retval != PAM_SUCCESS)
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return (retval);
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user = (const char *)item;
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if (getpwnam(user) == NULL) {
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pam_set_item(pamh, PAM_USER,
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template_user);
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PAM_LOG("Using template user");
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}
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}
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return (PAM_SUCCESS);
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case TAC_AUTHEN_STATUS_FAIL:
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tac_close(tach);
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PAM_VERBOSE_ERROR("TACACS+ authentication failed");
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return (PAM_AUTH_ERR);
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case TAC_AUTHEN_STATUS_GETUSER:
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case TAC_AUTHEN_STATUS_GETPASS:
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if ((srvr_msg = get_msg(tach)) == NULL)
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return (PAM_SERVICE_ERR);
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if (status == TAC_AUTHEN_STATUS_GETUSER)
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retval = pam_get_user(pamh, &user_msg,
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*srvr_msg ? srvr_msg : NULL);
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else if (status == TAC_AUTHEN_STATUS_GETPASS)
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retval = pam_get_authtok(pamh,
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PAM_AUTHTOK, &user_msg,
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*srvr_msg ? srvr_msg : "Password:");
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free(srvr_msg);
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if (retval != PAM_SUCCESS) {
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/* XXX - send a TACACS+ abort packet */
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tac_close(tach);
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return (retval);
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}
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if (set_msg(tach, user_msg) == -1)
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return (PAM_SERVICE_ERR);
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break;
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case TAC_AUTHEN_STATUS_GETDATA:
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if ((srvr_msg = get_msg(tach)) == NULL)
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return (PAM_SERVICE_ERR);
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retval = pam_prompt(pamh,
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openpam_get_option(pamh, PAM_OPT_ECHO_PASS) ?
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PAM_PROMPT_ECHO_ON : PAM_PROMPT_ECHO_OFF,
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&data_msg, "%s", *srvr_msg ? srvr_msg : "Data:");
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free(srvr_msg);
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if (retval != PAM_SUCCESS) {
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/* XXX - send a TACACS+ abort packet */
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tac_close(tach);
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return (retval);
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}
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retval = set_msg(tach, data_msg);
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memset(data_msg, 0, strlen(data_msg));
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free(data_msg);
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if (retval == -1)
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return (PAM_SERVICE_ERR);
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break;
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case TAC_AUTHEN_STATUS_ERROR:
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srvr_msg = (char *)tac_get_data(tach, &msg_len);
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if (srvr_msg != NULL && msg_len != 0) {
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syslog(LOG_CRIT, "tac_send_authen:"
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" server detected error: %s", srvr_msg);
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free(srvr_msg);
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}
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else
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syslog(LOG_CRIT,
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"tac_send_authen: server detected error");
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tac_close(tach);
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return (PAM_AUTHINFO_UNAVAIL);
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break;
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case TAC_AUTHEN_STATUS_RESTART:
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case TAC_AUTHEN_STATUS_FOLLOW:
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default:
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syslog(LOG_CRIT,
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"tac_send_authen: unexpected status %#x", status);
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tac_close(tach);
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return (PAM_AUTHINFO_UNAVAIL);
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}
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}
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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_IGNORE);
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}
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PAM_MODULE_ENTRY("pam_tacplus");
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