/*
 * 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 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
#ifndef _ISCSIT_AUTHCLIENT_H_
#define _ISCSIT_AUTHCLIENT_H_

#define ISCSI_AUTH_PASSED       0
#define ISCSI_AUTH_FAILED       1

enum { iscsitAuthStringMaxLength = 256 };

enum { AuthStringMaxLength = 256 };
enum { AuthStringBlockMaxLength = 1024 };
enum { AuthLargeBinaryMaxLength = 1024 };

enum { iscsitAuthChapResponseLength = 16 };

enum { iscsitAuthMethodMaxCount = 2 };

enum { iscsitAuthChapAlgorithmMd5 = 5 };

enum {
        AKT_CHAP_A = 0,
        AKT_CHAP_I,
        AKT_CHAP_C,
        AKT_CHAP_N,
        AKT_CHAP_R,
        AUTH_KEY_TYPE_MAX
};

typedef union auth_value {
        uint32_t        numeric;
        char            *string;
        unsigned char   *binary;
} auth_value_t;

typedef struct auth_key {
        unsigned char   present;
        unsigned int    len;
        auth_value_t    value;
} auth_key_t;

typedef struct iscsit_auth_key_block {
        auth_key_t      key[AUTH_KEY_TYPE_MAX];
} auth_key_block_t;

typedef struct auth_large_binary {
        unsigned char largeBinary[AuthLargeBinaryMaxLength];
} auth_large_binary_t;

typedef enum {
        AM_CHAP = 1, /* keep 0 as invalid */
        AM_KRB5,
        AM_SPKM1,
        AM_SPKM2,
        AM_SRP,
        AM_NONE
} iscsit_auth_method_t;

typedef enum {
        /* authentication phase start status */
        AP_AM_UNDECIDED = 0,
        AP_AM_PROPOSED,
        AP_AM_DECIDED,

        /* authentication phase for chap */
        AP_CHAP_A_WAITING,
        AP_CHAP_A_RCVD,
        AP_CHAP_R_WAITING,
        AP_CHAP_R_RCVD,

        /* authentication phase for kerberos */
        AP_KRB_REQ_WAITING,
        AP_KRB_REQ_RCVD,

        /* authentication phase done */
        AP_DONE
} iscsit_auth_phase_t;

typedef struct iscsit_auth_client {
        iscsit_auth_phase_t     phase;
        iscsit_auth_method_t    negotiatedMethod;

        auth_large_binary_t     auth_send_binary_block;

        auth_key_block_t        recvKeyBlock;
        auth_key_block_t        sendKeyBlock;
} iscsit_auth_client_t;

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

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

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

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

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

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

int
client_auth_key_present(auth_key_block_t *keyBlock,
    int key_type);

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);

int
client_verify_chap_resp(char *target_chap_name, char *initiator_chap_name,
    uint8_t *password, int password_len,
    unsigned int chap_i, uchar_t *chap_c, unsigned int challenge_len,
    uchar_t *chap_r, unsigned int resp_len);

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

#endif /* _ISCSIT_AUTHCLIENT_H_ */