port/iscsit/iscsit_authclient.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
 */

#include <sys/types.h>
#include <sys/random.h>
#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>

#include <sys/socket.h>
#include <inet/tcp.h>

#include <sys/stmf.h>
#include <sys/stmf_ioctl.h>
#include <sys/portif.h>
#include <sys/idm/idm.h>
#include <sys/iscsit/chap.h>

#include "iscsit.h"
#include "radius_auth.h"

void
client_set_numeric_data(auth_key_block_t *keyBlock,
    int key_type,
    uint32_t numeric)
{
    auth_key_t *p;

    ASSERT(key_type < AUTH_KEY_TYPE_MAX);

    p = &keyBlock->key[key_type];
    p->value.numeric = numeric;
    p->present = 1;
}

void
client_set_string_data(auth_key_block_t *keyBlock,
    int key_type,
    char *string)
{
    auth_key_t *p;

    ASSERT(key_type < AUTH_KEY_TYPE_MAX);

    p = &keyBlock->key[key_type];
    p->value.string = string;
    p->present = 1;
}

void
client_set_binary_data(auth_key_block_t *keyBlock,
    int key_type,
    unsigned char *binary, unsigned int len)
{
    auth_key_t *p;

    ASSERT(key_type < AUTH_KEY_TYPE_MAX);

    p = &keyBlock->key[key_type];
    p->value.binary = binary;
    p->len = len;
    p->present = 1;
}

void
client_get_numeric_data(auth_key_block_t *keyBlock,
    int key_type,
    uint32_t *numeric)
{
    auth_key_t *p;

    ASSERT(key_type < AUTH_KEY_TYPE_MAX);

    p = &keyBlock->key[key_type];
    *numeric = p->value.numeric;
}

void
client_get_string_data(auth_key_block_t *keyBlock,
    int key_type,
    char **string)
{
    auth_key_t *p;

    ASSERT(key_type < AUTH_KEY_TYPE_MAX);

    p = &keyBlock->key[key_type];
    *string = p->value.string;
}

void
client_get_binary_data(auth_key_block_t *keyBlock,
    int key_type,
    unsigned char **binary, unsigned int *len)
{
    auth_key_t *p;

    ASSERT(key_type < AUTH_KEY_TYPE_MAX);

    p = &keyBlock->key[key_type];
    *binary = p->value.binary;
    *len = p->len;
}

int
client_auth_key_present(auth_key_block_t *keyBlock,
    int key_type)
{
    auth_key_t *p;

    ASSERT(key_type < AUTH_KEY_TYPE_MAX);

    p = &keyBlock->key[key_type];

    return (p->present != 0 ? 1 : 0);
}

/*ARGSUSED*/
void
client_compute_chap_resp(uchar_t *resp,
    unsigned int chap_i,
    uint8_t *password, int password_len,
    uchar_t *chap_c, unsigned int challenge_len)
{
    MD5_CTX     context;

    MD5Init(&context);

    /*
     * id byte
     */
    resp[0] = (uchar_t)chap_i;
    MD5Update(&context, resp, 1);

    /*
     * shared secret
     */
    MD5Update(&context, (uchar_t *)password, password_len);

    /*
     * challenge value
     */
    MD5Update(&context, chap_c, challenge_len);

    MD5Final(resp, &context);
}

int
iscsit_verify_chap_resp(iscsit_conn_login_t *lsm,
    unsigned int chap_i,
    uchar_t *chap_c, unsigned int challenge_len,
    uchar_t *chap_r, unsigned int resp_len)
{
    uchar_t     verifyData[iscsitAuthChapResponseLength];
    conn_auth_t *auth = &lsm->icl_auth;

    /* Check if RADIUS access is enabled */
    if (auth->ca_use_radius == B_TRUE) {
        chap_validation_status_type chap_valid_status;
        RADIUS_CONFIG       radius_cfg;
        struct sockaddr_storage *sa = &auth->ca_radius_server;
        struct sockaddr_in  *sin;
        struct sockaddr_in6 *sin6;

        /* Use RADIUS server to authentication target */
        sin = (struct sockaddr_in *)sa;
        radius_cfg.rad_svr_port = ntohs(sin->sin_port);
        if (sa->ss_family == AF_INET) {
            /* IPv4 */
            radius_cfg.rad_svr_addr.i_addr.in4.s_addr =
                sin->sin_addr.s_addr;
            radius_cfg.rad_svr_addr.i_insize = sizeof (in_addr_t);
        } else if (sa->ss_family == AF_INET6) {
            /* IPv6 */
            sin6 = (struct sockaddr_in6 *)sa;
            bcopy(sin6->sin6_addr.s6_addr,
                radius_cfg.rad_svr_addr.i_addr.in6.s6_addr,
                sizeof (struct in6_addr));
            radius_cfg.rad_svr_addr.i_insize = sizeof (in6_addr_t);
        } else {
            return (ISCSI_AUTH_FAILED);
        }

        bcopy(auth->ca_radius_secret,
            radius_cfg.rad_svr_shared_secret,
            MAX_RAD_SHARED_SECRET_LEN);
        radius_cfg.rad_svr_shared_secret_len =
            auth->ca_radius_secretlen;

        chap_valid_status = iscsit_radius_chap_validate(
            auth->ca_ini_chapuser,
            auth->ca_tgt_chapuser,
            chap_c,
            challenge_len,
            chap_r,
            resp_len,
            chap_i,
            radius_cfg.rad_svr_addr,
            radius_cfg.rad_svr_port,
            radius_cfg.rad_svr_shared_secret,
            radius_cfg.rad_svr_shared_secret_len);

        if (chap_valid_status == CHAP_VALIDATION_PASSED) {
            return (ISCSI_AUTH_PASSED);
        }
        return (ISCSI_AUTH_FAILED);
    }

    /* Empty chap secret is not allowed */
    if (auth->ca_ini_chapsecretlen == 0) {
        return (ISCSI_AUTH_FAILED);
    }

    /* only MD5 is supported */
    if (resp_len != sizeof (verifyData)) {
        return (ISCSI_AUTH_FAILED);
    }

    client_compute_chap_resp(
        &verifyData[0],
        chap_i,
        auth->ca_ini_chapsecret, auth->ca_ini_chapsecretlen,
        chap_c, challenge_len);

    if (bcmp(chap_r, verifyData,
        sizeof (verifyData)) != 0) {
        return (ISCSI_AUTH_FAILED);
    }

    /* chap response OK */
    return (ISCSI_AUTH_PASSED);
}

void
auth_random_set_data(uchar_t *data, unsigned int length)
{
    (void) random_get_pseudo_bytes(data, length);
}