libsmb/common/smb_auth.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) 2007, 2012, Oracle and/or its affiliates. All rights reserved.
 */

#include <strings.h>
#include <stdlib.h>
#include <smbsrv/string.h>
#include <smbsrv/libsmb.h>

extern void randomize(char *data, unsigned len);
static uint64_t unix_micro_to_nt_time(struct timeval *unix_time);

/*
 * smb_auth_qnd_unicode
 *
 * Quick and dirty unicode conversion!
 * Returns the length of dst in bytes.
 */
int
smb_auth_qnd_unicode(smb_wchar_t *dst, const char *src, int length)
{
    int i;
    unsigned int count;
    smb_wchar_t new_char;

    if ((count = oemtoucs(dst, src, length, OEM_CPG_1252)) == 0) {
        for (i = 0; i < length; ++i) {
            new_char = (smb_wchar_t)src[i] & 0xff;
            dst[i] = LE_IN16(&new_char);
        }
        dst[i] = 0;
        count = length;
    }

    return (count * sizeof (smb_wchar_t));
}

/*
 * smb_auth_lmupr
 *
 * Converts the given LM password to all uppercase.
 * The standard strupr cannot
 * be used here because lm_pwd doesn't have to be
 * nul terminated.
 */
static void
smb_auth_lmupr(unsigned char *lm_pwd)
{
    unsigned char *p = lm_pwd;
    int i;

    for (i = 0; (*p) && (i < SMBAUTH_LM_PWD_SZ); i++) {
        if (smb_isascii(*p)) {
            *p = smb_toupper(*p);
            p++;
        }
    }
}

/*
 * smb_auth_lm_hash
 *
 * Source: Implementing CIFS (Chris Hertel)
 *
 * 1. The password, as entered by user, is either padded with nulls
 *    or trimmed to 14 bytes.
 *    . Note that the 14-byte result string is not handled as a
 *      nul-terminated string.
 *    . The given password is OEM not Unicode
 *
 * 2. The 14-byte password is converted to all uppercase
 *
 * 3. The result is used as key to encrypt the KGS magic string to
 *    make a 16-byte hash.
 */
int
smb_auth_lm_hash(const char *password, unsigned char *lm_hash)
{
    unsigned char lm_pwd[SMBAUTH_LM_PWD_SZ];

    bzero((void *)lm_pwd, SMBAUTH_LM_PWD_SZ);
    (void) strncpy((char *)lm_pwd, password, SMBAUTH_LM_PWD_SZ);
    smb_auth_lmupr(lm_pwd);

    return (smb_auth_DES(lm_hash, SMBAUTH_HASH_SZ, lm_pwd,
        SMBAUTH_LM_PWD_SZ, (unsigned char *)SMBAUTH_LM_MAGIC_STR,
        sizeof (SMBAUTH_LM_MAGIC_STR)));
}

/*
 * smb_auth_lm_response
 *
 * Create a LM response from the given LM hash and challenge.
 *
 * Returns SMBAUTH_FAILURE if any problems occur, SMBAUTH_SUCCESS if
 * all goes well.
 */
static int
smb_auth_lm_response(unsigned char *hash,
    unsigned char *challenge, int clen,
    unsigned char *lm_rsp)
{
    unsigned char S21[21];
    int rc;

    /*
     * 14-byte LM Hash should be padded with 5 nul bytes to create
     * a 21-byte string to be used in producing LM response
     */
    bzero(&S21[SMBAUTH_HASH_SZ], 5);
    bcopy(hash, S21, SMBAUTH_HASH_SZ);

    /* padded LM Hash -> LM Response */
    rc = smb_auth_DES(lm_rsp, SMBAUTH_RESP_SZ, S21, 21, challenge, clen);
    return (rc);
}

/*
 * smb_auth_ntlm_hash
 *
 * Make NTLM Hash (using MD4) from the given password.
 * The result will contain a 16-byte NTLM hash.
 */
int
smb_auth_ntlm_hash(const char *password, unsigned char *hash)
{
    smb_wchar_t *unicode_password;
    int length;
    int rc;

    if (password == NULL || hash == NULL)
        return (SMBAUTH_FAILURE);

    length = strlen(password);
    unicode_password = (smb_wchar_t *)
        malloc((length + 1) * sizeof (smb_wchar_t));

    if (unicode_password == NULL)
        return (SMBAUTH_FAILURE);

    length = smb_auth_qnd_unicode(unicode_password, password, length);
    rc = smb_auth_md4(hash, (unsigned char *)unicode_password, length);

    free(unicode_password);
    return (rc);
}

/*
 * smb_auth_ntlm_response
 *
 * Make LM/NTLM response from the given LM/NTLM Hash and given
 * challenge.
 */
static int
smb_auth_ntlm_response(unsigned char *hash,
    unsigned char *challenge, int clen,
    unsigned char *ntlm_rsp)
{
    unsigned char S21[21];

    bcopy(hash, S21, SMBAUTH_HASH_SZ);
    bzero(&S21[SMBAUTH_HASH_SZ], 5);
    if (smb_auth_DES((unsigned char *)ntlm_rsp, SMBAUTH_RESP_SZ,
        S21, 21, challenge, clen) == SMBAUTH_FAILURE)
        return (0);
    return (SMBAUTH_RESP_SZ);
}

/*
 * smb_auth_ntlm2_session_hash
 *
 * data = concat(challenge, client_nonce); [ntlm2 session nonce]
 * hash = MD5(data);
 * NTLM2 session hash = head(hash, 8);
 *
 * Returns SMBAUTH_SUCCESS if cryptology framework use was successful,
 * Otherwise, returns SMBAUTH_FAILURE.
 */
int
smb_auth_ntlm2_session_hash(
    const unsigned char *nonce, int nlen, unsigned char *ntlm2_sess_hash)
{
    uint8_t digest[MD_DIGEST_LEN];

    if (smb_auth_md5(digest, nonce, nlen) != SMBAUTH_SUCCESS)
        return (SMBAUTH_FAILURE);

    bcopy(digest, ntlm2_sess_hash, SMBAUTH_SESSION_HASH_SZ);
    return (SMBAUTH_SUCCESS);
}

/*
 * ntlm2_sess_rsp = DES(data=ntlm2_sess_hash, key=ntlm_hash)
 * On success, returns SMBAUTH_SUCCESS. Otherwise, returns SMBAUTH_FAILURE.
 */
int
smb_auth_ntlm2_session_response(unsigned char *session_nonce, int slen,
    const unsigned char *ntlm_hash, int hlen, unsigned char *ntlm2_sess_rsp,
    int rlen)
{
    unsigned char ntlm2_sess_hash[SMBAUTH_SESSION_HASH_SZ];
    unsigned char S21[21];

    if (smb_auth_ntlm2_session_hash(session_nonce, slen,
        ntlm2_sess_hash) == SMBAUTH_FAILURE)
        return (SMBAUTH_FAILURE);

    bzero(S21, 21);
    bcopy(ntlm_hash, S21, hlen);

    return (smb_auth_DES(ntlm2_sess_rsp, rlen, S21, 21, ntlm2_sess_hash,
        SMBAUTH_SESSION_HASH_SZ));
}

/*
 * smb_auth_gen_data_blob
 *
 * Fill the NTLMv2 data blob structure with information as described in
 * "Implementing CIFS, The Common Internet File System". (pg. 282)
 */
static void
smb_auth_gen_data_blob(smb_auth_data_blob_t *blob, char *ntdomain)
{
    struct timeval now;

    (void) memset(blob->ndb_signature, 1, 2);
    (void) memset(&blob->ndb_signature[2], 0, 2);
    (void) memset(blob->ndb_reserved, 0, sizeof (blob->ndb_reserved));

    (void) gettimeofday(&now, 0);
    blob->ndb_timestamp = unix_micro_to_nt_time(&now);
    randomize((char *)blob->ndb_clnt_challenge,
        SMBAUTH_V2_CLNT_CHALLENGE_SZ);
    (void) memset(blob->ndb_unknown, 0, sizeof (blob->ndb_unknown));
    blob->ndb_names[0].nne_len = smb_auth_qnd_unicode(
        blob->ndb_names[0].nne_name, ntdomain, strlen(ntdomain));
    blob->ndb_names[0].nne_type = SMBAUTH_NAME_TYPE_DOMAIN_NETBIOS;
    blob->ndb_names[1].nne_len = 0;
    blob->ndb_names[1].nne_type = SMBAUTH_NAME_TYPE_LIST_END;
    *blob->ndb_names[1].nne_name = 0;
    (void) memset(blob->ndb_unknown2, 0, sizeof (blob->ndb_unknown2));
}

/*
 * smb_auth_memcpy
 *
 * It increments the pointer to the destination buffer for the easy of
 * concatenation.
 */
static void
smb_auth_memcpy(unsigned char **dstbuf,
    unsigned char *srcbuf,
    int srcbuf_len)
{
    (void) memcpy(*dstbuf, srcbuf, srcbuf_len);
    *dstbuf += srcbuf_len;
}

/*
 * smb_auth_blob_to_string
 *
 * Prepare the data blob string which will be used in NTLMv2 response
 * generation.
 *
 * Assumption: Caller must allocate big enough buffer to prevent buffer
 * overrun.
 *
 * Returns the len of the data blob string.
 */
static int
smb_auth_blob_to_string(smb_auth_data_blob_t *blob, unsigned char *data_blob)
{
    unsigned char *bufp = data_blob;

    smb_auth_memcpy(&bufp, blob->ndb_signature,
        sizeof (blob->ndb_signature));
    smb_auth_memcpy(&bufp, blob->ndb_reserved,
        sizeof (blob->ndb_reserved));
    smb_auth_memcpy(&bufp, (unsigned char *)&blob->ndb_timestamp,
        sizeof (blob->ndb_timestamp));
    smb_auth_memcpy(&bufp, blob->ndb_clnt_challenge,
        SMBAUTH_V2_CLNT_CHALLENGE_SZ);
    smb_auth_memcpy(&bufp, blob->ndb_unknown, sizeof (blob->ndb_unknown));
    smb_auth_memcpy(&bufp, (unsigned char *)&blob->ndb_names[0].nne_type,
        sizeof (blob->ndb_names[0].nne_type));
    smb_auth_memcpy(&bufp, (unsigned char *)&blob->ndb_names[0].nne_len,
        sizeof (blob->ndb_names[0].nne_len));
    smb_auth_memcpy(&bufp, (unsigned char *)blob->ndb_names[0].nne_name,
        blob->ndb_names[0].nne_len);
    smb_auth_memcpy(&bufp, (unsigned char *)&blob->ndb_names[1].nne_type,
        sizeof (blob->ndb_names[1].nne_type));
    smb_auth_memcpy(&bufp, (unsigned char *)&blob->ndb_names[1].nne_len,
        sizeof (blob->ndb_names[1].nne_len));
    smb_auth_memcpy(&bufp, blob->ndb_unknown2, sizeof (blob->ndb_unknown2));

    /*LINTED E_PTRDIFF_OVERFLOW*/
    return (bufp - data_blob);
}

/*
 * smb_auth_ntlmv2_hash
 *
 * The NTLM v2 hash will be created from the given NTLM hash, username,
 * and the NETBIOS name of the domain.
 *
 * The NTLMv2 hash will be returned via the ntlmv2_hash parameter which
 * will be used in the calculation of the NTLMv2 and LMv2 responses.
 */
int
smb_auth_ntlmv2_hash(unsigned char *ntlm_hash,
    char *username,
    char *ntdomain,
    unsigned char *ntlmv2_hash)
{
    smb_wchar_t *data;
    int data_len;
    unsigned char *buf;
    int rc;

    if (username == NULL || ntdomain == NULL)
        return (SMBAUTH_FAILURE);

    (void) smb_strupr(username);

    data_len = strlen(username) + strlen(ntdomain);
    buf = (unsigned char *)malloc((data_len + 1) * sizeof (char));
    if (buf == NULL)
        return (SMBAUTH_FAILURE);

    (void) snprintf((char *)buf, data_len + 1, "%s%s", username, ntdomain);
    data = (smb_wchar_t *)malloc((data_len + 1) * sizeof (smb_wchar_t));
    if (data == NULL) {
        free(buf);
        return (SMBAUTH_FAILURE);
    }

    data_len = smb_auth_qnd_unicode(data, (char *)buf, data_len);
    rc = SMBAUTH_HMACT64((unsigned char *)data, data_len, ntlm_hash,
        SMBAUTH_HASH_SZ, ntlmv2_hash);

    free(buf);
    free(data);
    return (rc);
}

/*
 * smb_auth_v2_response
 *
 * Caculates either the LMv2 or NTLMv2 response.
 *
 * Same algorithm is used for calculating both LMv2 or NTLMv2 responses.
 * This routine will return NTLMv2 response if the data blob information
 * is passed in as the clnt_data. Otherwise, it will return LMv2 response
 * with the 8-byte client challenge(a.k.a blip) as the clnt_data.
 *
 * (LM/NTLM)v2 response is the hmac-md5 hash of the specified data
 * (server challenge + NTLMv2 data blob or LMv2 client challenge)
 * using the NTLMv2 hash as the key.
 *
 * Returns the size of the corresponding v2 response upon success.
 * Otherwise, returns -1 on error.
 */
static int
smb_auth_v2_response(
    unsigned char *hash,
    unsigned char *srv_challenge, int slen,
    unsigned char *clnt_data, int clen,
    unsigned char *v2_rsp)
{
    unsigned char *hmac_data;

    hmac_data = (unsigned char *)malloc((slen + clen) * sizeof (char));
    if (!hmac_data) {
        return (-1);
    }

    (void) memcpy(hmac_data, srv_challenge, slen);
    (void) memcpy(&hmac_data[slen], clnt_data, clen);
    if (SMBAUTH_HMACT64(hmac_data, slen + clen, (unsigned char *)hash,
        SMBAUTH_HASH_SZ, (unsigned char *)v2_rsp) != SMBAUTH_SUCCESS)
        return (-1);
    (void) memcpy(&v2_rsp[SMBAUTH_HASH_SZ], clnt_data, clen);

    free(hmac_data);
    return (SMBAUTH_HASH_SZ + clen);
}

/*
 * smb_auth_set_info
 *
 * Fill the smb_auth_info instance with either NTLM or NTLMv2 related
 * authentication information based on the LMCompatibilityLevel.
 *
 * If the LMCompatibilityLevel equals 2, the SMB Redirector will perform
 * NTLM challenge/response authentication which requires the NTLM hash and
 * NTLM response.
 *
 * If the LMCompatibilityLevel is 3 or above, the SMB Redirector will
 * perfrom NTLMv2 challenge/response authenticatoin which requires the
 * NTLM hash, NTLMv2 hash, NTLMv2 response and LMv2 response.
 *
 * Returns -1 on error. Otherwise, returns 0 upon success.
 */
int
smb_auth_set_info(char *username,
    char *password,
    unsigned char *ntlm_hash,
    char *domain,
    unsigned char *srv_challenge_key,
    int srv_challenge_len,
    int lmcomp_lvl,
    smb_auth_info_t *auth)
{
    unsigned short blob_len;
    unsigned char blob_buf[SMBAUTH_BLOB_MAXLEN];
    int rc;
    char *uppercase_dom;

    auth->lmcompatibility_lvl = lmcomp_lvl;
    if (lmcomp_lvl == 2) {
        auth->ci_len = 0;
        *auth->ci = 0;
        if (!ntlm_hash) {
            if (smb_auth_ntlm_hash(password, auth->hash) !=
                SMBAUTH_SUCCESS)
                return (-1);
        } else {
            (void) memcpy(auth->hash, ntlm_hash, SMBAUTH_HASH_SZ);
        }

        auth->cs_len = smb_auth_ntlm_response(auth->hash,
            srv_challenge_key, srv_challenge_len, auth->cs);
    } else {
        if (!ntlm_hash) {
            if (smb_auth_ntlm_hash(password, auth->hash) !=
                SMBAUTH_SUCCESS)
                return (-1);
        } else {
            (void) memcpy(auth->hash, ntlm_hash, SMBAUTH_HASH_SZ);
        }

        if (!domain)
            return (-1);

        if ((uppercase_dom = strdup(domain)) == NULL)
            return (-1);

        (void) smb_strupr(uppercase_dom);

        if (smb_auth_ntlmv2_hash(auth->hash, username,
            uppercase_dom, auth->hash_v2) != SMBAUTH_SUCCESS) {
            free(uppercase_dom);
            return (-1);
        }

        /* generate data blob */
        smb_auth_gen_data_blob(&auth->data_blob, uppercase_dom);
        free(uppercase_dom);
        blob_len = smb_auth_blob_to_string(&auth->data_blob, blob_buf);

        /* generate NTLMv2 response */
        rc = smb_auth_v2_response(auth->hash_v2, srv_challenge_key,
            srv_challenge_len, blob_buf, blob_len, auth->cs);

        if (rc < 0)
            return (-1);

        auth->cs_len = rc;

        /* generate LMv2 response */
        rc = smb_auth_v2_response(auth->hash_v2, srv_challenge_key,
            srv_challenge_len, auth->data_blob.ndb_clnt_challenge,
            SMBAUTH_V2_CLNT_CHALLENGE_SZ, auth->ci);

        if (rc < 0)
            return (-1);

        auth->ci_len = rc;
    }

    return (0);
}

/*
 * smb_auth_gen_session_key
 *
 * Generate the NTLM user session key if LMCompatibilityLevel is 2 or
 * NTLMv2 user session key if LMCompatibilityLevel is 3 or above.
 *
 * NTLM_Session_Key = MD4(NTLM_Hash);
 *
 * NTLMv2_Session_Key = HMAC_MD5(NTLMv2Hash, 16, NTLMv2_HMAC, 16)
 *
 * Prior to calling this function, the auth instance should be set
 * via smb_auth_set_info().
 *
 * Returns the appropriate session key.
 */
int
smb_auth_gen_session_key(smb_auth_info_t *auth, unsigned char *session_key)
{
    int rc;

    if (auth->lmcompatibility_lvl == 2)
        rc = smb_auth_md4(session_key, auth->hash, SMBAUTH_HASH_SZ);
    else
        rc = SMBAUTH_HMACT64((unsigned char *)auth->cs,
            SMBAUTH_HASH_SZ, (unsigned char *)auth->hash_v2,
            SMBAUTH_SESSION_KEY_SZ, session_key);

    return (rc);
}

/* 100's of ns between 1/1/1970 and 1/1/1601 */
#define NT_TIME_BIAS    (134774LL * 24LL * 60LL * 60LL * 10000000LL)

static uint64_t
unix_micro_to_nt_time(struct timeval *unix_time)
{
    uint64_t nt_time;

    nt_time = unix_time->tv_sec;
    nt_time *= 10000000;  /* seconds to 100ns */
    nt_time += unix_time->tv_usec * 10;
    return (nt_time + NT_TIME_BIAS);
}

/*
 * Local Authentication
 */
static boolean_t
smb_lm_password_ok(
    unsigned char *challenge,
    uint32_t clen,
    unsigned char *lm_hash,
    unsigned char *passwd)
{
    unsigned char lm_resp[SMBAUTH_RESP_SZ];
    int rc;

    rc = smb_auth_lm_response(lm_hash, challenge, clen, lm_resp);
    if (rc != SMBAUTH_SUCCESS)
        return (B_FALSE);

    return (bcmp(lm_resp, passwd, SMBAUTH_RESP_SZ) == 0);
}

static boolean_t
smb_ntlm_password_ok(
    unsigned char *challenge,
    uint32_t clen,
    unsigned char *ntlm_hash,
    unsigned char *passwd,
    unsigned char *session_key)
{
    unsigned char ntlm_resp[SMBAUTH_RESP_SZ];
    int rc;
    boolean_t ok;

    rc = smb_auth_ntlm_response(ntlm_hash, challenge, clen, ntlm_resp);
    if (rc != SMBAUTH_RESP_SZ)
        return (B_FALSE);

    ok = (bcmp(ntlm_resp, passwd, SMBAUTH_RESP_SZ) == 0);
    if (ok && (session_key)) {
        rc = smb_auth_md4(session_key, ntlm_hash, SMBAUTH_HASH_SZ);
        if (rc != SMBAUTH_SUCCESS)
            ok = B_FALSE;
    }
    return (ok);
}

static boolean_t
smb_ntlmv2_password_ok(
    unsigned char *challenge,
    uint32_t clen,
    unsigned char *ntlm_hash,
    unsigned char *passwd,
    int pwdlen,
    char *domain,
    char *username,
    uchar_t *session_key)
{
    unsigned char *clnt_blob;
    int clnt_blob_len;
    unsigned char ntlmv2_hash[SMBAUTH_HASH_SZ];
    unsigned char *ntlmv2_resp;
    boolean_t ok = B_FALSE;
    char *dest[3];
    int i;
    int rc;

    clnt_blob_len = pwdlen - SMBAUTH_HASH_SZ;
    clnt_blob = &passwd[SMBAUTH_HASH_SZ];
    dest[0] = domain;
    if ((dest[1] = strdup(domain)) == NULL)
        return (B_FALSE);
    (void) smb_strupr(dest[1]);
    dest[2] = "";

    /*
     * 15.5.2 The NTLMv2 Password Hash, pg. 279, of the "Implementing CIFS"
     *
     * The NTLMv2 Hash is created from:
     * - NTLM hash
     * - user's username, and
     * - the name of the logon destination(i.e. the NetBIOS name of either
     *   the SMB server or NT Domain against which the user is trying to
     *   authenticate.
     *
     * Experiments show this is not exactly the case.
     * For Windows Server 2003, the domain name needs to be included and
     * converted to uppercase. For Vista, the domain name needs to be
     * included also, but leave the case alone.  And in some cases it needs
     * to be empty. All three variants are tried here.
     */

    ntlmv2_resp = (unsigned char *)malloc(SMBAUTH_HASH_SZ + clnt_blob_len);
    if (ntlmv2_resp == NULL) {
        free(dest[1]);
        return (B_FALSE);
    }

    for (i = 0; i < (sizeof (dest) / sizeof (char *)); i++) {
        if (smb_auth_ntlmv2_hash(ntlm_hash, username, dest[i],
            ntlmv2_hash) != SMBAUTH_SUCCESS)
            break;

        if (smb_auth_v2_response(ntlmv2_hash, challenge,
            clen, clnt_blob, clnt_blob_len, ntlmv2_resp) < 0)
            break;

        ok = (bcmp(passwd, ntlmv2_resp, pwdlen) == 0);
        if (ok && session_key) {
            rc = SMBAUTH_HMACT64(ntlmv2_resp,
                SMBAUTH_HASH_SZ, ntlmv2_hash,
                SMBAUTH_SESSION_KEY_SZ, session_key);
            if (rc != SMBAUTH_SUCCESS) {
                ok = B_FALSE;
            }
            break;
        }
    }

    free(dest[1]);
    free(ntlmv2_resp);
    return (ok);
}

/*
 * NTLM2 Session Response User Session Key
 *
 * Used when NTLMv1 authentication is employed with NTLM2 session security.
 * This key is derived from the NTLM2 session response information as follows:
 * The HMAC-MD5 algorithm is applied to the session nonce, using the NTLM
 * User Session Key as the key. The resulting 16-byte value is the NTLM2
 * Session Response User Session Key.
 */
int
smb_auth_ntlm2_usr_ssn_key(
    const unsigned char *ntlm_hash, const unsigned char *sess_nonce,
    unsigned char *result)
{
    unsigned char ntlm_usr_sess_key[SMBAUTH_HASH_SZ];

    if (smb_auth_md4(ntlm_usr_sess_key, ntlm_hash, SMBAUTH_HASH_SZ)
        != SMBAUTH_SUCCESS)
        return (SMBAUTH_FAILURE);

    return (SMBAUTH_HMACT64(sess_nonce, SMBAUTH_SESSION_NONCE_SZ,
        ntlm_usr_sess_key, SMBAUTH_SESSION_KEY_SZ, result));

}

static boolean_t
smb_ntlm2_session_password_ok(
    unsigned char *challenge,
    uint32_t clen,
    unsigned char *ntlm_hash,
    unsigned char *passwd,
    int pwdlen,
    unsigned char *nonce,
    int nlen,
    uchar_t *session_key)
{

    unsigned char ntlm2_sess_resp[SMBAUTH_RESP_SZ];
    unsigned char ntlm2_sess_nonce[SMBAUTH_SESSION_NONCE_SZ];

    bcopy(challenge, ntlm2_sess_nonce, clen);
    bcopy(nonce, ntlm2_sess_nonce + clen, nlen);

    if (smb_auth_ntlm2_session_response(ntlm2_sess_nonce,
        SMBAUTH_SESSION_NONCE_SZ, ntlm_hash, SMBAUTH_HASH_SZ,
        ntlm2_sess_resp, SMBAUTH_RESP_SZ) != SMBAUTH_SUCCESS)
        return (B_FALSE);

    if (smb_auth_ntlm2_usr_ssn_key(ntlm_hash, ntlm2_sess_nonce,
        session_key) != SMBAUTH_SUCCESS)
        return (B_FALSE);

    return (bcmp(passwd, ntlm2_sess_resp, pwdlen) == 0);
}

static boolean_t
smb_lmv2_password_ok(
    unsigned char *challenge,
    uint32_t clen,
    unsigned char *ntlm_hash,
    unsigned char *passwd,
    char *domain,
    char *username)
{
    unsigned char *clnt_challenge;
    unsigned char ntlmv2_hash[SMBAUTH_HASH_SZ];
    unsigned char lmv2_resp[SMBAUTH_RESP_SZ];
    boolean_t ok = B_FALSE;
    char *dest[3];
    int i;

    clnt_challenge = &passwd[SMBAUTH_HASH_SZ];
    dest[0] = domain;
    if ((dest[1] = strdup(domain)) == NULL)
        return (B_FALSE);
    (void) smb_strupr(dest[1]);
    dest[2] = "";

    /*
     * 15.5.2 The NTLMv2 Password Hash, pg. 279, of the "Implementing CIFS"
     *
     * The NTLMv2 Hash is created from:
     * - NTLM hash
     * - user's username, and
     * - the name of the logon destination(i.e. the NetBIOS name of either
     *   the SMB server or NT Domain against which the suer is trying to
     *   authenticate.
     *
     * Experiments show this is not exactly the case.
     * For Windows Server 2003, the domain name needs to be included and
     * converted to uppercase. For Vista, the domain name needs to be
     * included also, but leave the case alone.  And in some cases it needs
     * to be empty. All three variants are tried here.
     */

    for (i = 0; i < (sizeof (dest) / sizeof (char *)); i++) {
        if (smb_auth_ntlmv2_hash(ntlm_hash, username, dest[i],
            ntlmv2_hash) != SMBAUTH_SUCCESS)
            break;

        if (smb_auth_v2_response(ntlmv2_hash, challenge,
            clen, clnt_challenge, SMBAUTH_V2_CLNT_CHALLENGE_SZ,
            lmv2_resp) < 0)
            break;

        ok = (bcmp(passwd, lmv2_resp, SMBAUTH_RESP_SZ) == 0);
        if (ok)
            break;
    }

    free(dest[1]);
    return (ok);
}

/*
 * smb_auth_validate_lm
 *
 * Validates given LM/LMv2 client response, passed in passwd arg, against
 * stored user's password, passed in smbpw
 *
 * If LM level <=3 server accepts LM responses, otherwise LMv2
 */
boolean_t
smb_auth_validate_lm(
    unsigned char *challenge,
    uint32_t clen,
    smb_passwd_t *smbpw,
    unsigned char *passwd,
    int pwdlen,
    char *domain,
    char *username)
{
    boolean_t ok = B_FALSE;
    int64_t lmlevel;

    if (pwdlen != SMBAUTH_RESP_SZ)
        return (B_FALSE);

    if (smb_config_getnum(SMB_CI_SVR_LM_LEVEL, &lmlevel) != SMBD_SMF_OK)
        return (B_FALSE);

    if (lmlevel <= 3) {
        ok = smb_lm_password_ok(challenge, clen, smbpw->pw_lmhash,
            passwd);
    }

    if (!ok)
        ok = smb_lmv2_password_ok(challenge, clen, smbpw->pw_nthash,
            passwd, domain, username);

    return (ok);
}

/*
 * smb_auth_validate_nt
 *
 * Validates given NTLM/NTLMv2/NTLM 2 session response sent by the client,
 * passed in passwd arg, against stored user's password, passed in smbpw
 *
 * If LM level <=4 server accepts NTLM/NTLMv2 responses, otherwise only NTLMv2.
 */
boolean_t
smb_auth_validate_nt(
    unsigned char *challenge,
    uint32_t clen,
    smb_passwd_t *smbpw,
    unsigned char *passwd,
    int pwdlen,
    char *domain,
    char *username,
    unsigned char *nonce,
    int nlen,
    uchar_t *session_key)
{
    int64_t lmlevel;
    boolean_t ok;

    if (smb_config_getnum(SMB_CI_SVR_LM_LEVEL, &lmlevel) != SMBD_SMF_OK)
        return (B_FALSE);

    if ((lmlevel == 5) && (pwdlen <= SMBAUTH_RESP_SZ))
        return (B_FALSE);

    if (pwdlen > SMBAUTH_RESP_SZ)
        ok = smb_ntlmv2_password_ok(challenge, clen,
            smbpw->pw_nthash, passwd, pwdlen,
            domain, username, session_key);
    else
        ok = smb_ntlm_password_ok(challenge, clen,
            smbpw->pw_nthash, passwd, session_key);

    if (!ok && (nonce != NULL))
        ok = smb_ntlm2_session_password_ok(challenge, clen,
            smbpw->pw_nthash, passwd, pwdlen, nonce, nlen,
            session_key);
    return (ok);
}