libsmb/clikrb5.c

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/* 
   Unix SMB/CIFS implementation.
   simple kerberos5 routines for active directory
   Copyright (C) Andrew Tridgell 2001
   Copyright (C) Luke Howard 2002-2003
   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   Copyright (C) Guenther Deschner 2005
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#define KRB5_PRIVATE    1       /* this file uses PRIVATE interfaces! */
#define KRB5_DEPRECATED 1       /* this file uses DEPRECATED interfaces! */

#include "includes.h"

#ifdef HAVE_KRB5

#ifdef HAVE_KRB5_KEYBLOCK_KEYVALUE
#define KRB5_KEY_TYPE(k)        ((k)->keytype)
#define KRB5_KEY_LENGTH(k)      ((k)->keyvalue.length)
#define KRB5_KEY_DATA(k)        ((k)->keyvalue.data)
#else
#define KRB5_KEY_TYPE(k)        ((k)->enctype)
#define KRB5_KEY_LENGTH(k)      ((k)->length)
#define KRB5_KEY_DATA(k)        ((k)->contents)
#endif /* HAVE_KRB5_KEYBLOCK_KEYVALUE */

/**************************************************************
 Wrappers around kerberos string functions that convert from
 utf8 -> unix charset and vica versa.
**************************************************************/

/**************************************************************
 krb5_parse_name that takes a UNIX charset.
**************************************************************/

 krb5_error_code smb_krb5_parse_name(krb5_context context,
                                const char *name, /* in unix charset */
                                krb5_principal *principal)
{
        krb5_error_code ret;
        char *utf8_name;

        if (push_utf8_allocate(&utf8_name, name) == (size_t)-1) {
                return ENOMEM;
        }

        ret = krb5_parse_name(context, utf8_name, principal);
        SAFE_FREE(utf8_name);
        return ret;
}

#ifdef HAVE_KRB5_PARSE_NAME_NOREALM
/**************************************************************
 krb5_parse_name_norealm that takes a UNIX charset.
**************************************************************/

static krb5_error_code smb_krb5_parse_name_norealm_conv(krb5_context context,
                                const char *name, /* in unix charset */
                                krb5_principal *principal)
{
        krb5_error_code ret;
        char *utf8_name;

        *principal = NULL;
        if (push_utf8_allocate(&utf8_name, name) == (size_t)-1) {
                return ENOMEM;
        }

        ret = krb5_parse_name_norealm(context, utf8_name, principal);
        SAFE_FREE(utf8_name);
        return ret;
}
#endif

/**************************************************************
 krb5_parse_name that returns a UNIX charset name. Must
 be freed with normal free() call.
**************************************************************/

 krb5_error_code smb_krb5_unparse_name(krb5_context context,
                                        krb5_const_principal principal,
                                        char **unix_name)
{
        krb5_error_code ret;
        char *utf8_name;

        *unix_name = NULL;
        ret = krb5_unparse_name(context, principal, &utf8_name);
        if (ret) {
                return ret;
        }

        if (pull_utf8_allocate(unix_name, utf8_name)==-1) {
                krb5_free_unparsed_name(context, utf8_name);
                return ENOMEM;
        }
        krb5_free_unparsed_name(context, utf8_name);
        return 0;
}

#ifndef HAVE_KRB5_SET_REAL_TIME
/*
 * This function is not in the Heimdal mainline.
 */
 krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds)
{
        krb5_error_code ret;
        int32_t sec, usec;

        ret = krb5_us_timeofday(context, &sec, &usec);
        if (ret)
                return ret;

        context->kdc_sec_offset = seconds - sec;
        context->kdc_usec_offset = microseconds - usec;

        return 0;
}
#endif

#if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)

#if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)

/* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
 * to krb5_set_default_tgs_ktypes. See
 *         http://lists.samba.org/archive/samba-technical/2006-July/048271.html
 *
 * If the MIT libraries are not exporting internal symbols, we will end up in
 * this branch, which is correct. Otherwise we will continue to use the
 * internal symbol
 */
 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
{
    return krb5_set_default_tgs_enctypes(ctx, enc);
}

#elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)

/* Heimdal */
 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
{
        return krb5_set_default_in_tkt_etypes(ctx, enc);
}

#endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */

#endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */

#if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
/* HEIMDAL */
 void setup_kaddr( krb5_address *pkaddr, struct sockaddr *paddr)
{
        pkaddr->addr_type = KRB5_ADDRESS_INET;
        pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
        pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
}
#elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
/* MIT */
 void setup_kaddr( krb5_address *pkaddr, struct sockaddr *paddr)
{
        pkaddr->addrtype = ADDRTYPE_INET;
        pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
        pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
}
#else
#error UNKNOWN_ADDRTYPE
#endif

#if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY) && defined(HAVE_KRB5_ENCRYPT_BLOCK)
 int create_kerberos_key_from_string_direct(krb5_context context,
                                        krb5_principal host_princ,
                                        krb5_data *password,
                                        krb5_keyblock *key,
                                        krb5_enctype enctype)
{
        int ret;
        krb5_data salt;
        krb5_encrypt_block eblock;

        ret = krb5_principal2salt(context, host_princ, &salt);
        if (ret) {
                DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
                return ret;
        }
        krb5_use_enctype(context, &eblock, enctype);
        ret = krb5_string_to_key(context, &eblock, key, password, &salt);
        SAFE_FREE(salt.data);
        return ret;
}
#elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
 int create_kerberos_key_from_string_direct(krb5_context context,
                                        krb5_principal host_princ,
                                        krb5_data *password,
                                        krb5_keyblock *key,
                                        krb5_enctype enctype)
{
        int ret;
        krb5_salt salt;

        ret = krb5_get_pw_salt(context, host_princ, &salt);
        if (ret) {
                DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
                return ret;
        }
        
        ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
        krb5_free_salt(context, salt);
        return ret;
}
#else
#error UNKNOWN_CREATE_KEY_FUNCTIONS
#endif

 int create_kerberos_key_from_string(krb5_context context,
                                        krb5_principal host_princ,
                                        krb5_data *password,
                                        krb5_keyblock *key,
                                        krb5_enctype enctype)
{
        krb5_principal salt_princ = NULL;
        int ret;
        /*
         * Check if we've determined that the KDC is salting keys for this
         * principal/enctype in a non-obvious way.  If it is, try to match
         * its behavior.
         */
        salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype);
        ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype);
        if (salt_princ) {
                krb5_free_principal(context, salt_princ);
        }
        return ret;
}

#if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
 krb5_error_code get_kerberos_allowed_etypes(krb5_context context, 
                                            krb5_enctype **enctypes)
{
        return krb5_get_permitted_enctypes(context, enctypes);
}
#elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
 krb5_error_code get_kerberos_allowed_etypes(krb5_context context, 
                                            krb5_enctype **enctypes)
{
        return krb5_get_default_in_tkt_etypes(context, enctypes);
}
#else
#error UNKNOWN_GET_ENCTYPES_FUNCTIONS
#endif

#if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
 krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
                                        krb5_auth_context auth_context,
                                        krb5_keyblock *keyblock)
{
        return krb5_auth_con_setkey(context, auth_context, keyblock);
}
#endif

BOOL unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
{
        DATA_BLOB pac_contents;
        ASN1_DATA data;
        int data_type;

        if (!auth_data->length) {
                return False;
        }

        asn1_load(&data, *auth_data);
        asn1_start_tag(&data, ASN1_SEQUENCE(0));
        asn1_start_tag(&data, ASN1_SEQUENCE(0));
        asn1_start_tag(&data, ASN1_CONTEXT(0));
        asn1_read_Integer(&data, &data_type);
        
        if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) {
                DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type));
                asn1_free(&data);
                return False;
        }
        
        asn1_end_tag(&data);
        asn1_start_tag(&data, ASN1_CONTEXT(1));
        asn1_read_OctetString(&data, &pac_contents);
        asn1_end_tag(&data);
        asn1_end_tag(&data);
        asn1_end_tag(&data);
        asn1_free(&data);

        *unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length);

        data_blob_free(&pac_contents);

        return True;
}

 BOOL get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt)
{
        DATA_BLOB auth_data_wrapped;
        BOOL got_auth_data_pac = False;
        int i;
        
#if defined(HAVE_KRB5_TKT_ENC_PART2)
        if (tkt->enc_part2 && tkt->enc_part2->authorization_data && 
            tkt->enc_part2->authorization_data[0] && 
            tkt->enc_part2->authorization_data[0]->length)
        {
                for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) {
                
                        if (tkt->enc_part2->authorization_data[i]->ad_type != 
                            KRB5_AUTHDATA_IF_RELEVANT) {
                                DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n", 
                                        tkt->enc_part2->authorization_data[i]->ad_type));
                                continue;
                        }

                        auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents,
                                                      tkt->enc_part2->authorization_data[i]->length);

                        /* check if it is a PAC */
                        got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
                        data_blob_free(&auth_data_wrapped);
                        
                        if (got_auth_data_pac) {
                                return true;
                        }
                }

                return got_auth_data_pac;
        }
                
#else
        if (tkt->ticket.authorization_data && 
            tkt->ticket.authorization_data->len)
        {
                for (i = 0; i < tkt->ticket.authorization_data->len; i++) {
                        
                        if (tkt->ticket.authorization_data->val[i].ad_type != 
                            KRB5_AUTHDATA_IF_RELEVANT) {
                                DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n", 
                                        tkt->ticket.authorization_data->val[i].ad_type));
                                continue;
                        }

                        auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data,
                                                      tkt->ticket.authorization_data->val[i].ad_data.length);

                        /* check if it is a PAC */
                        got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
                        data_blob_free(&auth_data_wrapped);

                        if (got_auth_data_pac) {
                                return true;
                        }
                }

                return got_auth_data_pac;
        }
#endif
        return False;
}

 krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
{
#if defined(HAVE_KRB5_TKT_ENC_PART2)
        return tkt->enc_part2->client;
#else
        return tkt->client;
#endif
}

#if !defined(HAVE_KRB5_LOCATE_KDC)

/* krb5_locate_kdc is an internal MIT symbol. MIT are not yet willing to commit
 * to a public interface for this functionality, so we have to be able to live
 * without it if the MIT libraries are hiding their internal symbols.
 */

#if defined(KRB5_KRBHST_INIT)
/* Heimdal */
 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters)
{
        krb5_krbhst_handle hnd;
        krb5_krbhst_info *hinfo;
        krb5_error_code rc;
        int num_kdcs, i;
        struct sockaddr *sa;
        struct addrinfo *ai;

        *addr_pp = NULL;
        *naddrs = 0;

        rc = krb5_krbhst_init(ctx, realm->data, KRB5_KRBHST_KDC, &hnd);
        if (rc) {
                DEBUG(0, ("smb_krb5_locate_kdc: krb5_krbhst_init failed (%s)\n", error_message(rc)));
                return rc;
        }

        for ( num_kdcs = 0; (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); num_kdcs++)
                ;

        krb5_krbhst_reset(ctx, hnd);

        if (!num_kdcs) {
                DEBUG(0, ("smb_krb5_locate_kdc: zero kdcs found !\n"));
                krb5_krbhst_free(ctx, hnd);
                return -1;
        }

        sa = SMB_MALLOC_ARRAY( struct sockaddr, num_kdcs );
        if (!sa) {
                DEBUG(0, ("smb_krb5_locate_kdc: malloc failed\n"));
                krb5_krbhst_free(ctx, hnd);
                naddrs = 0;
                return -1;
        }

        memset(sa, '\0', sizeof(struct sockaddr) * num_kdcs );

        for (i = 0; i < num_kdcs && (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); i++) {

#if defined(HAVE_KRB5_KRBHST_GET_ADDRINFO)
                rc = krb5_krbhst_get_addrinfo(ctx, hinfo, &ai);
                if (rc) {
                        DEBUG(0,("krb5_krbhst_get_addrinfo failed: %s\n", error_message(rc)));
                        continue;
                }
#endif
                if (hinfo->ai && hinfo->ai->ai_family == AF_INET) 
                        memcpy(&sa[i], hinfo->ai->ai_addr, sizeof(struct sockaddr));
        }

        krb5_krbhst_free(ctx, hnd);

        *naddrs = num_kdcs;
        *addr_pp = sa;
        return 0;
}

#else /* ! defined(KRB5_KRBHST_INIT) */

 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
                struct sockaddr **addr_pp, int *naddrs, int get_masters)
{
        DEBUG(0, ("unable to explicitly locate the KDC on this platform\n"));
        return KRB5_KDC_UNREACH;
}

#endif /* KRB5_KRBHST_INIT */

#else /* ! HAVE_KRB5_LOCATE_KDC */

 krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm,
                struct sockaddr **addr_pp, int *naddrs, int get_masters)
{
        return krb5_locate_kdc(ctx, realm, addr_pp, naddrs, get_masters);
}

#endif /* HAVE_KRB5_LOCATE_KDC */

#if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
 void krb5_free_unparsed_name(krb5_context context, char *val)
{
        SAFE_FREE(val);
}
#endif

 void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
{
#if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
        if (pdata->data) {
                krb5_free_data_contents(context, pdata);
        }
#else
        SAFE_FREE(pdata->data);
#endif
}

 void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype)
{
#if defined(HAVE_KRB5_KEYBLOCK_IN_CREDS)
        KRB5_KEY_TYPE((&pcreds->keyblock)) = enctype;
#elif defined(HAVE_KRB5_SESSION_IN_CREDS)
        KRB5_KEY_TYPE((&pcreds->session)) = enctype;
#else
#error UNKNOWN_KEYBLOCK_MEMBER_IN_KRB5_CREDS_STRUCT
#endif
}

 BOOL kerberos_compatible_enctypes(krb5_context context,
                                  krb5_enctype enctype1,
                                  krb5_enctype enctype2)
{
#if defined(HAVE_KRB5_C_ENCTYPE_COMPARE)
        krb5_boolean similar = 0;

        krb5_c_enctype_compare(context, enctype1, enctype2, &similar);
        return similar ? True : False;
#elif defined(HAVE_KRB5_ENCTYPES_COMPATIBLE_KEYS)
        return krb5_enctypes_compatible_keys(context, enctype1, enctype2) ? True : False;
#endif
}

static BOOL ads_cleanup_expired_creds(krb5_context context, 
                                      krb5_ccache  ccache,
                                      krb5_creds  *credsp)
{
        krb5_error_code retval;
        const char *cc_type = krb5_cc_get_type(context, ccache);

        DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
                  cc_type, krb5_cc_get_name(context, ccache),
                  http_timestring(credsp->times.endtime)));

        /* we will probably need new tickets if the current ones
           will expire within 10 seconds.
        */
        if (credsp->times.endtime >= (time(NULL) + 10))
                return False;

        /* heimdal won't remove creds from a file ccache, and 
           perhaps we shouldn't anyway, since internally we 
           use memory ccaches, and a FILE one probably means that
           we're using creds obtained outside of our exectuable
        */
        if (strequal(cc_type, "FILE")) {
                DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
                return False;
        }

        retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
        if (retval) {
                DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
                          error_message(retval)));
                /* If we have an error in this, we want to display it,
                   but continue as though we deleted it */
        }
        return True;
}

/*
  we can't use krb5_mk_req because w2k wants the service to be in a particular format
*/
static krb5_error_code ads_krb5_mk_req(krb5_context context, 
                                       krb5_auth_context *auth_context, 
                                       const krb5_flags ap_req_options,
                                       const char *principal,
                                       krb5_ccache ccache, 
                                       krb5_data *outbuf, 
                                       time_t *expire_time)
{
        krb5_error_code           retval;
        krb5_principal    server;
        krb5_creds              * credsp;
        krb5_creds                creds;
        krb5_data in_data;
        BOOL creds_ready = False;
        int i = 0, maxtries = 3;
        
        retval = smb_krb5_parse_name(context, principal, &server);
        if (retval) {
                DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
                return retval;
        }
        
        /* obtain ticket & session key */
        ZERO_STRUCT(creds);
        if ((retval = krb5_copy_principal(context, server, &creds.server))) {
                DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n", 
                         error_message(retval)));
                goto cleanup_princ;
        }
        
        if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
                /* This can commonly fail on smbd startup with no ticket in the cache.
                 * Report at higher level than 1. */
                DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n", 
                         error_message(retval)));
                goto cleanup_creds;
        }

        while (!creds_ready && (i < maxtries)) {

                if ((retval = krb5_get_credentials(context, 0, ccache, 
                                                   &creds, &credsp))) {
                        DEBUG(1,("ads_krb5_mk_req: krb5_get_credentials failed for %s (%s)\n",
                                 principal, error_message(retval)));
                        goto cleanup_creds;
                }

                /* cope with ticket being in the future due to clock skew */
                if ((unsigned)credsp->times.starttime > time(NULL)) {
                        time_t t = time(NULL);
                        int time_offset =(int)((unsigned)credsp->times.starttime-t);
                        DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
                        krb5_set_real_time(context, t + time_offset + 1, 0);
                }

                if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
                        creds_ready = True;
                }

                i++;
        }

        DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
                  principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
                  http_timestring((unsigned)credsp->times.endtime), 
                  (unsigned)credsp->times.endtime));

        if (expire_time) {
                *expire_time = (time_t)credsp->times.endtime;
        }

        in_data.length = 0;
        retval = krb5_mk_req_extended(context, auth_context, ap_req_options, 
                                      &in_data, credsp, outbuf);
        if (retval) {
                DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n", 
                         error_message(retval)));
        }
        
        krb5_free_creds(context, credsp);

cleanup_creds:
        krb5_free_cred_contents(context, &creds);

cleanup_princ:
        krb5_free_principal(context, server);

        return retval;
}

/*
  get a kerberos5 ticket for the given service 
*/
int cli_krb5_get_ticket(const char *principal, time_t time_offset, 
                        DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, 
                        uint32 extra_ap_opts, const char *ccname, 
                        time_t *tgs_expire)

{
        krb5_error_code retval;
        krb5_data packet;
        krb5_context context = NULL;
        krb5_ccache ccdef = NULL;
        krb5_auth_context auth_context = NULL;
        krb5_enctype enc_types[] = {
#ifdef ENCTYPE_ARCFOUR_HMAC
                ENCTYPE_ARCFOUR_HMAC,
#endif 
                ENCTYPE_DES_CBC_MD5, 
                ENCTYPE_DES_CBC_CRC, 
                ENCTYPE_NULL};

        initialize_krb5_error_table();
        retval = krb5_init_context(&context);
        if (retval) {
                DEBUG(1,("cli_krb5_get_ticket: krb5_init_context failed (%s)\n", 
                         error_message(retval)));
                goto failed;
        }

        if (time_offset != 0) {
                krb5_set_real_time(context, time(NULL) + time_offset, 0);
        }

        if ((retval = krb5_cc_resolve(context, ccname ?
                        ccname : krb5_cc_default_name(context), &ccdef))) {
                DEBUG(1,("cli_krb5_get_ticket: krb5_cc_default failed (%s)\n",
                         error_message(retval)));
                goto failed;
        }

        if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
                DEBUG(1,("cli_krb5_get_ticket: krb5_set_default_tgs_ktypes failed (%s)\n",
                         error_message(retval)));
                goto failed;
        }

        if ((retval = ads_krb5_mk_req(context, 
                                        &auth_context, 
                                        AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
                                        principal,
                                        ccdef, &packet,
                                        tgs_expire))) {
                goto failed;
        }

        get_krb5_smb_session_key(context, auth_context, session_key_krb5, False);

        *ticket = data_blob(packet.data, packet.length);

        kerberos_free_data_contents(context, &packet); 

failed:

        if ( context ) {
                if (ccdef)
                        krb5_cc_close(context, ccdef);
                if (auth_context)
                        krb5_auth_con_free(context, auth_context);
                krb5_free_context(context);
        }
                
        return retval;
}

 BOOL get_krb5_smb_session_key(krb5_context context, krb5_auth_context auth_context, DATA_BLOB *session_key, BOOL remote)
 {
        krb5_keyblock *skey;
        krb5_error_code err;
        BOOL ret = False;

        if (remote)
                err = krb5_auth_con_getremotesubkey(context, auth_context, &skey);
        else
                err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey);
        if (err == 0 && skey != NULL) {
                DEBUG(10, ("Got KRB5 session key of length %d\n",  (int)KRB5_KEY_LENGTH(skey)));
                *session_key = data_blob(KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
                dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);

                ret = True;

                krb5_free_keyblock(context, skey);
        } else {
                DEBUG(10, ("KRB5 error getting session key %d\n", err));
        }

        return ret;
 }


#if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );

 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
{
        static krb5_data kdata;

        kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
        kdata.length = strlen((const char *)kdata.data);
        return &kdata;
}
#endif

 krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
{
#if defined(HAVE_KRB5_KT_FREE_ENTRY)
        return krb5_kt_free_entry(context, kt_entry);
#elif defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
        return krb5_free_keytab_entry_contents(context, kt_entry);
#else
#error UNKNOWN_KT_FREE_FUNCTION
#endif
}

 void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum, 
                                    PAC_SIGNATURE_DATA *sig)
{
#ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
        cksum->cksumtype        = (krb5_cksumtype)sig->type;
        cksum->checksum.length  = sig->signature.buf_len;
        cksum->checksum.data    = sig->signature.buffer;
#else
        cksum->checksum_type    = (krb5_cksumtype)sig->type;
        cksum->length           = sig->signature.buf_len;
        cksum->contents         = sig->signature.buffer;
#endif
}

 krb5_error_code smb_krb5_verify_checksum(krb5_context context,
                                         krb5_keyblock *keyblock,
                                         krb5_keyusage usage,
                                         krb5_checksum *cksum,
                                         uint8 *data,
                                         size_t length)
{
        krb5_error_code ret;

        /* verify the checksum */

        /* welcome to the wonderful world of samba's kerberos abstraction layer:
         * 
         * function                     heimdal 0.6.1rc3        heimdal 0.7     MIT krb 1.4.2
         * -----------------------------------------------------------------------------
         * krb5_c_verify_checksum       -                       works           works
         * krb5_verify_checksum         works (6 args)          works (6 args)  broken (7 args) 
         */

#if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
        {
                krb5_boolean checksum_valid = False;
                krb5_data input;

                input.data = (char *)data;
                input.length = length;

                ret = krb5_c_verify_checksum(context, 
                                             keyblock, 
                                             usage,
                                             &input, 
                                             cksum,
                                             &checksum_valid);
                if (ret) {
                        DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n", 
                                error_message(ret)));
                        return ret;
                }

                if (!checksum_valid)
                        ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
        }

#elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)

        /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
         * without enctype and it ignores any key_usage types - Guenther */

        {

                krb5_crypto crypto;
                ret = krb5_crypto_init(context,
                                       keyblock,
                                       0,
                                       &crypto);
                if (ret) {
                        DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n", 
                                error_message(ret)));
                        return ret;
                }

                ret = krb5_verify_checksum(context,
                                           crypto,
                                           usage,
                                           data,
                                           length,
                                           cksum);

                krb5_crypto_destroy(context, crypto);
        }

#else
#error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
#endif

        return ret;
}

 time_t get_authtime_from_tkt(krb5_ticket *tkt)
{
#if defined(HAVE_KRB5_TKT_ENC_PART2)
        return tkt->enc_part2->times.authtime;
#else
        return tkt->ticket.authtime;
#endif
}

#ifdef HAVE_KRB5_DECODE_AP_REQ  /* Heimdal */
static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
{
#ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
        if (ap_req->ticket->enc_part.kvno)
                return ap_req->ticket->enc_part.kvno;
#else /* Heimdal */
        if (ap_req->ticket.enc_part.kvno) 
                return *ap_req->ticket.enc_part.kvno;
#endif
        return 0;
}

static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
{
#ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
        return ap_req->ticket.enc_part.etype;
#else /* MIT */
        return ap_req->ticket->enc_part.enctype;
#endif
}
#endif  /* HAVE_KRB5_DECODE_AP_REQ */

static krb5_error_code
get_key_from_keytab(krb5_context context,
                    krb5_const_principal server,
                    krb5_enctype enctype,
                    krb5_kvno kvno,
                    krb5_keyblock **out_key)
{
        krb5_keytab_entry entry;
        krb5_error_code ret;
        krb5_keytab keytab;
        char *name = NULL;

        /* We have to open a new keytab handle here, as MIT does
           an implicit open/getnext/close on krb5_kt_get_entry. We
           may be in the middle of a keytab enumeration when this is
           called. JRA. */

        ret = krb5_kt_default(context, &keytab);
        if (ret) {
                DEBUG(0,("get_key_from_keytab: failed to open keytab: %s\n", error_message(ret)));
                return ret;
        }

        if ( DEBUGLEVEL >= 10 ) {
                if (smb_krb5_unparse_name(context, server, &name) == 0) {
                        DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n", 
                                kvno, enctype, name));
                        SAFE_FREE(name);
                }
        }

        ret = krb5_kt_get_entry(context,
                                keytab,
                                server,
                                kvno,
                                enctype,
                                &entry);

        if (ret) {
                DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
                goto out;
        }

#ifdef HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK /* Heimdal */
        ret = krb5_copy_keyblock(context, &entry.keyblock, out_key);
#elif defined(HAVE_KRB5_KEYTAB_ENTRY_KEY) /* MIT */
        ret = krb5_copy_keyblock(context, &entry.key, out_key);
#else
#error UNKNOWN_KRB5_KEYTAB_ENTRY_FORMAT
#endif

        if (ret) {
                DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
                goto out;
        }
                
        smb_krb5_kt_free_entry(context, &entry);
        
out:    
        krb5_kt_close(context, keytab);
        return ret;
}

/* Prototypes */

 krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context, 
                                                 const krb5_data *inbuf, 
                                                 krb5_kvno *kvno, 
                                                 krb5_enctype *enctype)
{
#ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
        {
                krb5_error_code ret;
                krb5_ap_req ap_req;
                
                ret = krb5_decode_ap_req(context, inbuf, &ap_req);
                if (ret)
                        return ret;

                *kvno = get_kvno_from_ap_req(&ap_req);
                *enctype = get_enctype_from_ap_req(&ap_req);

                free_AP_REQ(&ap_req);
                return 0;
        }
#endif

        /* Possibly not an appropriate error code. */
        return KRB5KDC_ERR_BADOPTION;
}

 krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
                                                        krb5_auth_context *auth_context,
                                                        const krb5_data *inbuf,
                                                        krb5_const_principal server,
                                                        krb5_keytab keytab,
                                                        krb5_flags *ap_req_options,
                                                        krb5_ticket **ticket, 
                                                        krb5_keyblock **keyblock)
{
        krb5_error_code ret;
        krb5_kvno kvno;
        krb5_enctype enctype;
        krb5_keyblock *local_keyblock;

        ret = krb5_rd_req(context, 
                          auth_context, 
                          inbuf, 
                          server, 
                          keytab, 
                          ap_req_options, 
                          ticket);
        if (ret) {
                return ret;
        }
        
#ifdef KRB5_TICKET_HAS_KEYINFO
        enctype = (*ticket)->enc_part.enctype;
        kvno = (*ticket)->enc_part.kvno;
#else
        ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
        if (ret) {
                return ret;
        }
#endif

        ret = get_key_from_keytab(context, 
                                  server,
                                  enctype,
                                  kvno,
                                  &local_keyblock);
        if (ret) {
                DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
                goto out;
        }

out:
        if (ret && local_keyblock != NULL) {
                krb5_free_keyblock(context, local_keyblock);
        } else {
                *keyblock = local_keyblock;
        }

        return ret;
}

 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context, 
                                            const char *name, 
                                            krb5_principal *principal)
{
#ifdef HAVE_KRB5_PARSE_NAME_NOREALM
        return smb_krb5_parse_name_norealm_conv(context, name, principal);
#endif

        /* we are cheating here because parse_name will in fact set the realm.
         * We don't care as the only caller of smb_krb5_parse_name_norealm
         * ignores the realm anyway when calling
         * smb_krb5_principal_compare_any_realm later - Guenther */

        return smb_krb5_parse_name(context, name, principal);
}

 BOOL smb_krb5_principal_compare_any_realm(krb5_context context, 
                                          krb5_const_principal princ1, 
                                          krb5_const_principal princ2)
{
#ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM

        return krb5_principal_compare_any_realm(context, princ1, princ2);

/* krb5_princ_size is a macro in MIT */
#elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)

        int i, len1, len2;
        const krb5_data *p1, *p2;

        len1 = krb5_princ_size(context, princ1);
        len2 = krb5_princ_size(context, princ2);

        if (len1 != len2)
                return False;

        for (i = 0; i < len1; i++) {

                p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
                p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);

                if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
                        return False;
        }

        return True;
#else
#error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
#endif
}

 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
                                       const char *client_string,       /* gd@BER.SUSE.DE */
                                       const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
                                       time_t *expire_time)
{
        krb5_error_code ret;
        krb5_context context = NULL;
        krb5_ccache ccache = NULL;
        krb5_principal client = NULL;

        initialize_krb5_error_table();
        ret = krb5_init_context(&context);
        if (ret) {
                goto done;
        }

        if (!ccache_string) {
                ccache_string = krb5_cc_default_name(context);
        }

        DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));

        /* FIXME: we should not fall back to defaults */
        ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
        if (ret) {
                goto done;
        }

#ifdef HAVE_KRB5_GET_RENEWED_CREDS      /* MIT */
        {
                krb5_creds creds;
        
                if (client_string) {
                        ret = smb_krb5_parse_name(context, client_string, &client);
                        if (ret) {
                                goto done;
                        }
                } else {
                        ret = krb5_cc_get_principal(context, ccache, &client);
                        if (ret) {
                                goto done;
                        }
                }
        
                ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
                if (ret) {
                        DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
                        goto done;
                }

                /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
                ret = krb5_cc_initialize(context, ccache, client);
                if (ret) {
                        goto done;
                }
        
                ret = krb5_cc_store_cred(context, ccache, &creds);

                if (expire_time) {
                        *expire_time = (time_t) creds.times.endtime;
                }

                krb5_free_cred_contents(context, &creds);
        }
#elif defined(HAVE_KRB5_GET_KDC_CRED)   /* Heimdal */
        {
                krb5_kdc_flags flags;
                krb5_creds creds_in;
                krb5_realm *client_realm;
                krb5_creds *creds;

                memset(&creds_in, 0, sizeof(creds_in));

                if (client_string) {
                        ret = smb_krb5_parse_name(context, client_string, &creds_in.client);
                        if (ret) {
                                goto done;
                        }
                } else {
                        ret = krb5_cc_get_principal(context, ccache, &creds_in.client);
                        if (ret) {
                                goto done;
                        }
                }

                if (service_string) {
                        ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
                        if (ret) { 
                                goto done;
                        }
                } else {
                        /* build tgt service by default */
                        client_realm = krb5_princ_realm(context, creds_in.client);
                        if (!client_realm) {
                                ret = ENOMEM;
                                goto done;
                        }
                        ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
                        if (ret) {
                                goto done;
                        }
                }

                flags.i = 0;
                flags.b.renewable = flags.b.renew = True;

                ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds);
                if (ret) {
                        DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
                        goto done;
                }
                
                /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
                ret = krb5_cc_initialize(context, ccache, creds_in.client);
                if (ret) {
                        goto done;
                }
        
                ret = krb5_cc_store_cred(context, ccache, creds);

                if (expire_time) {
                        *expire_time = (time_t) creds->times.endtime;
                }
                                                
                krb5_free_cred_contents(context, &creds_in);
                krb5_free_creds(context, creds);
        }
#else
#error No suitable krb5 ticket renew function available
#endif


done:
        if (client) {
                krb5_free_principal(context, client);
        }
        if (context) {
                krb5_free_context(context);
        }
        if (ccache) {
                krb5_cc_close(context, ccache);
        }

        return ret;
    
}

 krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
{
        krb5_error_code ret = 0;
        if (addr == NULL) {
                return ret;
        }
#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
        krb5_free_addresses(context, addr->addrs);
#elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
        ret = krb5_free_addresses(context, addr->addrs);
        SAFE_FREE(addr->addrs);
#endif
        SAFE_FREE(addr);
        addr = NULL;
        return ret;
}

 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
{
        krb5_error_code ret = 0;
        nstring buf;
#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
        krb5_address **addrs = NULL;
#elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
        krb5_addresses *addrs = NULL;
#endif

        *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
        if (*kerb_addr == NULL) {
                return ENOMEM;
        }

        put_name(buf, global_myname(), ' ', 0x20);

#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
        {
                int num_addr = 2;

                addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
                if (addrs == NULL) {
                        SAFE_FREE(kerb_addr);
                        return ENOMEM;
                }

                memset(addrs, 0, sizeof(krb5_address *) * num_addr);

                addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
                if (addrs[0] == NULL) {
                        SAFE_FREE(addrs);
                        SAFE_FREE(kerb_addr);
                        return ENOMEM;
                }

                addrs[0]->magic = KV5M_ADDRESS;
                addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
                addrs[0]->length = MAX_NETBIOSNAME_LEN;
                addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
                if (addrs[0]->contents == NULL) {
                        SAFE_FREE(addrs[0]);
                        SAFE_FREE(addrs);
                        SAFE_FREE(kerb_addr);
                        return ENOMEM;
                }

                memcpy(addrs[0]->contents, buf, addrs[0]->length);

                addrs[1] = NULL;
        }
#elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
        {
                addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
                if (addrs == NULL) {
                        SAFE_FREE(kerb_addr);
                        return ENOMEM;
                }

                memset(addrs, 0, sizeof(krb5_addresses));

                addrs->len = 1;
                addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
                if (addrs->val == NULL) {
                        SAFE_FREE(addrs);
                        SAFE_FREE(kerb_addr);
                        return ENOMEM;
                }

                addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
                addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
                addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
                if (addrs->val[0].address.data == NULL) {
                        SAFE_FREE(addrs->val);
                        SAFE_FREE(addrs);
                        SAFE_FREE(kerb_addr);
                        return ENOMEM;
                }

                memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
        }
#else
#error UNKNOWN_KRB5_ADDRESS_FORMAT
#endif
        (*kerb_addr)->addrs = addrs;

        return ret;
}

 void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
{
#ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
        krb5_free_error_contents(context, krberror);
#else /* MIT */
        krb5_free_error(context, krberror);
#endif
}

 krb5_error_code handle_krberror_packet(krb5_context context,
                                        krb5_data *packet)
{
        krb5_error_code ret;
        BOOL got_error_code = False;

        DEBUG(10,("handle_krberror_packet: got error packet\n"));
        
#ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
        {
                krb5_error krberror;

                if ((ret = krb5_rd_error(context, packet, &krberror))) {
                        DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n", 
                                error_message(ret)));
                        return ret;
                }

                if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
                        ret = (krb5_error_code) krberror.error_code;
                        got_error_code = True;
                }

                smb_krb5_free_error(context, &krberror);
        }
#else /* MIT */
        {
                krb5_error *krberror;

                if ((ret = krb5_rd_error(context, packet, &krberror))) {
                        DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n", 
                                error_message(ret)));
                        return ret;
                }

                if (krberror->e_data.data == NULL) {
                        ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
                        got_error_code = True;
                }
                smb_krb5_free_error(context, krberror);
        }
#endif
        if (got_error_code) {
                DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n", 
                        error_message(ret), ret));
        }
        return ret;
}

 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
                                            krb5_get_init_creds_opt **opt)
{
#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
        /* Heimdal or modern MIT version */
        return krb5_get_init_creds_opt_alloc(context, opt);
#else
        /* Historical MIT version */
        krb5_get_init_creds_opt *my_opt;

        *opt = NULL;

        if ((my_opt = SMB_MALLOC(sizeof(krb5_get_init_creds_opt))) == NULL) {
                return ENOMEM;
        }

        krb5_get_init_creds_opt_init(my_opt);

        *opt =  my_opt;
        return 0;
#endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC  */
}

 void smb_krb5_get_init_creds_opt_free(krb5_context context,
                                krb5_get_init_creds_opt *opt)
{
#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE

#ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
        /* Modern MIT version */
        krb5_get_init_creds_opt_free(context, opt);
#else
        /* Heimdal version */
        krb5_get_init_creds_opt_free(opt);
#endif

#else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
        /* Historical MIT version */
        SAFE_FREE(opt);
        opt = NULL;
#endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
}

 krb5_error_code smb_krb5_mk_error(krb5_context context,
                                krb5_error_code error_code,
                                const krb5_principal server,
                                krb5_data *reply)
{
#ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
        /*
         * The MIT interface is *terrible*.
         * We have to construct this ourselves...
         */
        krb5_error e;

        memset(&e, 0, sizeof(e));
        krb5_us_timeofday(context, &e.stime, &e.susec);
        e.server = server;
#if defined(krb5_err_base)
        e.error = error_code - krb5_err_base;
#elif defined(ERROR_TABLE_BASE_krb5)
        e.error = error_code - ERROR_TABLE_BASE_krb5;
#else
        e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
#endif

        return krb5_mk_error(context, &e, reply);
#else /* Heimdal. */
        return krb5_mk_error(context,
                                error_code,
                                NULL,
                                NULL, /* e_data */
                                NULL,
                                server,
                                NULL,
                                NULL,
                                reply);
#endif
}

#else /* HAVE_KRB5 */
 /* this saves a few linking headaches */
 int cli_krb5_get_ticket(const char *principal, time_t time_offset, 
                        DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, uint32 extra_ap_opts,
                        const char *ccname, time_t *tgs_expire) 
{
         DEBUG(0,("NO KERBEROS SUPPORT\n"));
         return 1;
}

#endif

---