259 lines
7.1 KiB
C
259 lines
7.1 KiB
C
/*-
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* Copyright 1998 Juniper Networks, Inc.
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* All rights reserved.
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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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*
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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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* $FreeBSD$
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*/
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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_modules.h>
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#include "pam_mod_misc.h"
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/* Option names, including the "=" sign. */
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#define OPT_CONF "conf="
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#define OPT_TMPL "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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if ((retval = pam_get_item(pamh, item, &value)) != 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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if ((msg = tac_get_msg(tach)) == 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, int argc,
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const char **argv)
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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 = NULL;
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const char *template_user = NULL;
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int options = 0;
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int i;
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for (i = 0; i < argc; i++) {
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size_t len;
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pam_std_option(&options, argv[i]);
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if (strncmp(argv[i], OPT_CONF, (len = strlen(OPT_CONF))) == 0)
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conf_file = argv[i] + len;
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else if (strncmp(argv[i], OPT_TMPL,
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(len = strlen(OPT_TMPL))) == 0)
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template_user = argv[i] + len;
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}
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if ((tach = tac_open()) == 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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if ((retval = do_item(pamh, tach, PAM_USER,
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tac_set_user, "tac_set_user")) != PAM_SUCCESS)
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return retval;
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if ((retval = do_item(pamh, tach, PAM_TTY,
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tac_set_port, "tac_set_port")) != PAM_SUCCESS)
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return retval;
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if ((retval = do_item(pamh, tach, PAM_RHOST,
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tac_set_rem_addr, "tac_set_rem_addr")) != 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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int echo;
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if ((sflags = tac_send_authen(tach)) == -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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echo = TAC_AUTHEN_NOECHO(sflags) ? 0 : PAM_OPT_ECHO_PASS;
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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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/*
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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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}
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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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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[0] != '\0' ? srvr_msg : NULL);
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else if (status == TAC_AUTHEN_STATUS_GETPASS)
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retval = pam_get_pass(pamh, &user_msg,
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srvr_msg[0] != '\0' ? srvr_msg :
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"Password:", options | echo);
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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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(options|echo) & PAM_OPT_ECHO_PASS ?
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PAM_PROMPT_ECHO_ON : PAM_PROMPT_ECHO_OFF,
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srvr_msg[0] != '\0' ? srvr_msg : "Data:",
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&data_msg);
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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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} 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, int flags, int argc, const char **argv)
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{
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return PAM_SUCCESS;
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}
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PAM_MODULE_ENTRY("pam_tacplus");
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