330 lines
9.0 KiB
C
330 lines
9.0 KiB
C
/*-
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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 <radlib.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 <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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#define PAM_OPT_NAS_ID "nas_id"
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#define MAX_CHALLENGE_MSGS 10
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#define PASSWORD_PROMPT "RADIUS Password:"
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static int build_access_request(struct rad_handle *, const char *,
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const char *, const char *, const void *, size_t);
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static int do_accept(pam_handle_t *, struct rad_handle *);
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static int do_challenge(pam_handle_t *, struct rad_handle *,
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const char *);
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/*
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* Construct an access request, but don't send it. Returns 0 on success,
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* -1 on failure.
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*/
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static int
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build_access_request(struct rad_handle *radh, const char *user,
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const char *pass, const char *nas_id, const void *state, size_t state_len)
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{
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char host[MAXHOSTNAMELEN];
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if (rad_create_request(radh, RAD_ACCESS_REQUEST) == -1) {
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syslog(LOG_CRIT, "rad_create_request: %s", rad_strerror(radh));
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return (-1);
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}
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if (nas_id == NULL && gethostname(host, sizeof host) != -1)
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nas_id = host;
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if ((user != NULL &&
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rad_put_string(radh, RAD_USER_NAME, user) == -1) ||
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(pass != NULL &&
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rad_put_string(radh, RAD_USER_PASSWORD, pass) == -1) ||
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(nas_id != NULL &&
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rad_put_string(radh, RAD_NAS_IDENTIFIER, nas_id) == -1)) {
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syslog(LOG_CRIT, "rad_put_string: %s", rad_strerror(radh));
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return (-1);
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}
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if (state != NULL && rad_put_attr(radh, RAD_STATE, state,
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state_len) == -1) {
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syslog(LOG_CRIT, "rad_put_attr: %s", rad_strerror(radh));
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return (-1);
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}
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if (rad_put_int(radh, RAD_SERVICE_TYPE, RAD_AUTHENTICATE_ONLY) == -1) {
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syslog(LOG_CRIT, "rad_put_int: %s", rad_strerror(radh));
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return (-1);
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}
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return (0);
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}
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static int
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do_accept(pam_handle_t *pamh, struct rad_handle *radh)
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{
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int attrtype;
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const void *attrval;
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size_t attrlen;
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char *s;
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while ((attrtype = rad_get_attr(radh, &attrval, &attrlen)) > 0) {
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if (attrtype == RAD_USER_NAME) {
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s = rad_cvt_string(attrval, attrlen);
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if (s == NULL) {
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syslog(LOG_CRIT,
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"rad_cvt_string: out of memory");
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return (-1);
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}
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pam_set_item(pamh, PAM_USER, s);
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free(s);
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}
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}
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if (attrtype == -1) {
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syslog(LOG_CRIT, "rad_get_attr: %s", rad_strerror(radh));
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return (-1);
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}
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return (0);
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}
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static int
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do_challenge(pam_handle_t *pamh, struct rad_handle *radh, const char *user)
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{
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int retval;
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int attrtype;
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const void *attrval;
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size_t attrlen;
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const void *state;
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size_t statelen;
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struct pam_message msgs[MAX_CHALLENGE_MSGS];
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const struct pam_message *msg_ptrs[MAX_CHALLENGE_MSGS];
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struct pam_response *resp;
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int num_msgs;
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const void *item;
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const struct pam_conv *conv;
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state = NULL;
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statelen = 0;
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num_msgs = 0;
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while ((attrtype = rad_get_attr(radh, &attrval, &attrlen)) > 0) {
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switch (attrtype) {
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case RAD_STATE:
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state = attrval;
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statelen = attrlen;
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break;
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case RAD_REPLY_MESSAGE:
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if (num_msgs >= MAX_CHALLENGE_MSGS) {
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syslog(LOG_CRIT,
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"Too many RADIUS challenge messages");
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return (PAM_SERVICE_ERR);
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}
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msgs[num_msgs].msg = rad_cvt_string(attrval, attrlen);
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if (msgs[num_msgs].msg == NULL) {
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syslog(LOG_CRIT,
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"rad_cvt_string: out of memory");
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return (PAM_SERVICE_ERR);
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}
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msgs[num_msgs].msg_style = PAM_TEXT_INFO;
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msg_ptrs[num_msgs] = &msgs[num_msgs];
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num_msgs++;
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break;
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}
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}
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if (attrtype == -1) {
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syslog(LOG_CRIT, "rad_get_attr: %s", rad_strerror(radh));
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return (PAM_SERVICE_ERR);
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}
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if (num_msgs == 0) {
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msgs[num_msgs].msg = strdup("(null RADIUS challenge): ");
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if (msgs[num_msgs].msg == NULL) {
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syslog(LOG_CRIT, "Out of memory");
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return (PAM_SERVICE_ERR);
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}
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msgs[num_msgs].msg_style = PAM_TEXT_INFO;
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msg_ptrs[num_msgs] = &msgs[num_msgs];
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num_msgs++;
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}
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msgs[num_msgs-1].msg_style = PAM_PROMPT_ECHO_ON;
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if ((retval = pam_get_item(pamh, PAM_CONV, &item)) != PAM_SUCCESS) {
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syslog(LOG_CRIT, "do_challenge: cannot get PAM_CONV");
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return (retval);
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}
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conv = (const struct pam_conv *)item;
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if ((retval = conv->conv(num_msgs, msg_ptrs, &resp,
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conv->appdata_ptr)) != PAM_SUCCESS)
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return (retval);
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if (build_access_request(radh, user, resp[num_msgs-1].resp, NULL,
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state, statelen) == -1)
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return (PAM_SERVICE_ERR);
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memset(resp[num_msgs-1].resp, 0, strlen(resp[num_msgs-1].resp));
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free(resp[num_msgs-1].resp);
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free(resp);
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while (num_msgs > 0)
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free(msgs[--num_msgs].msg);
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return (PAM_SUCCESS);
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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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struct rad_handle *radh;
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const char *user, *tmpuser, *pass;
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const char *conf_file, *template_user, *nas_id;
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int retval;
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int e;
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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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nas_id = openpam_get_option(pamh, PAM_OPT_NAS_ID);
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retval = pam_get_user(pamh, &user, NULL);
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if (retval != PAM_SUCCESS)
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return (retval);
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PAM_LOG("Got user: %s", user);
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retval = pam_get_authtok(pamh, PAM_AUTHTOK, &pass, PASSWORD_PROMPT);
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if (retval != PAM_SUCCESS)
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return (retval);
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PAM_LOG("Got password");
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radh = rad_open();
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if (radh == NULL) {
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syslog(LOG_CRIT, "rad_open failed");
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return (PAM_SERVICE_ERR);
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}
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PAM_LOG("Radius opened");
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if (rad_config(radh, conf_file) == -1) {
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syslog(LOG_ALERT, "rad_config: %s", rad_strerror(radh));
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rad_close(radh);
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return (PAM_SERVICE_ERR);
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}
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PAM_LOG("Radius config file read");
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if (build_access_request(radh, user, pass, nas_id, NULL, 0) == -1) {
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rad_close(radh);
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return (PAM_SERVICE_ERR);
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}
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PAM_LOG("Radius build access done");
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for (;;) {
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switch (rad_send_request(radh)) {
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case RAD_ACCESS_ACCEPT:
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e = do_accept(pamh, radh);
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rad_close(radh);
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if (e == -1)
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return (PAM_SERVICE_ERR);
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if (template_user != NULL) {
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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,
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(const void **)&tmpuser);
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if (retval != PAM_SUCCESS)
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return (retval);
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if (getpwnam(tmpuser) == 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 RAD_ACCESS_REJECT:
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rad_close(radh);
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PAM_VERBOSE_ERROR("Radius rejection");
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return (PAM_AUTH_ERR);
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case RAD_ACCESS_CHALLENGE:
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retval = do_challenge(pamh, radh, user);
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if (retval != PAM_SUCCESS) {
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rad_close(radh);
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return (retval);
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}
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break;
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case -1:
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syslog(LOG_CRIT, "rad_send_request: %s",
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rad_strerror(radh));
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rad_close(radh);
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PAM_VERBOSE_ERROR("Radius failure");
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return (PAM_AUTHINFO_UNAVAIL);
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default:
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syslog(LOG_CRIT,
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"rad_send_request: unexpected return value");
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rad_close(radh);
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PAM_VERBOSE_ERROR("Radius error");
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return (PAM_SERVICE_ERR);
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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_SUCCESS);
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}
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PAM_MODULE_ENTRY("pam_radius");
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