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clikrb5.c

/* 
   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 2005-2007
   
   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 3 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, see <http://www.gnu.org/licenses/>.
*/

#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 /* Heimdal */
#define KRB5_KEY_TYPE(k)      ((k)->keytype) 
#define KRB5_KEY_LENGTH(k)    ((k)->keyvalue.length)
#define KRB5_KEY_DATA(k)      ((k)->keyvalue.data)
#else /* MIT */
#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 */
 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
{
      memset(pkaddr, '\0', sizeof(krb5_address));
#if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
      if (paddr->ss_family == AF_INET6) {
            pkaddr->addr_type = KRB5_ADDRESS_INET6;
            pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
            pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
            return true;
      }
#endif
      if (paddr->ss_family == AF_INET) {
            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);
            return true;
      }
      return false;
}
#elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
/* MIT */
 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
{
      memset(pkaddr, '\0', sizeof(krb5_address));
#if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
      if (paddr->ss_family == AF_INET6) {
            pkaddr->addrtype = ADDRTYPE_INET6;
            pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
            pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
            return true;
      }
#endif
      if (paddr->ss_family == AF_INET) {
            pkaddr->addrtype = ADDRTYPE_INET;
            pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
            pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
            return true;
      }
      return false;
}
#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_edata_ntstatus(TALLOC_CTX *mem_ctx, 
                     DATA_BLOB *edata, 
                     DATA_BLOB *edata_out)
{
      DATA_BLOB edata_contents;
      ASN1_DATA data;
      int edata_type;

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

      asn1_load(&data, *edata);
      asn1_start_tag(&data, ASN1_SEQUENCE(0));
      asn1_start_tag(&data, ASN1_CONTEXT(1));
      asn1_read_Integer(&data, &edata_type);

      if (edata_type != KRB5_PADATA_PW_SALT) {
            DEBUG(0,("edata is not of required type %d but of type %d\n", 
                  KRB5_PADATA_PW_SALT, edata_type));
            asn1_free(&data);
            return False;
      }
      
      asn1_start_tag(&data, ASN1_CONTEXT(2));
      asn1_read_OctetString(&data, &edata_contents);
      asn1_end_tag(&data);
      asn1_end_tag(&data);
      asn1_end_tag(&data);
      asn1_free(&data);

      *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);

      data_blob_free(&edata_contents);

      return True;
}


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 = smb_krb5_open_keytab(context, NULL, False, &keytab);
      if (ret) {
            DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%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;
      krb5_creds creds, creds_in, *creds_out = NULL;

      ZERO_STRUCT(creds);
      ZERO_STRUCT(creds_in);

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

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

      if (!ccache_string) {
            ret = EINVAL;
            goto done;
      }

      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;
      }

      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;
            }
      }

#ifdef HAVE_KRB5_GET_RENEWED_CREDS  /* MIT */
      {
            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;
            }
      }
#elif defined(HAVE_KRB5_GET_KDC_CRED)     /* Heimdal */
      {
            krb5_kdc_flags flags;
            krb5_realm *client_realm = NULL;

            ret = krb5_copy_principal(context, client, &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_out);
            if (ret) {
                  DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
                  goto done;
            }

            creds = *creds_out;
      }
#else
#error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
#endif

      /* 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;
      }

done:
      krb5_free_cred_contents(context, &creds_in);

      if (creds_out) {
            krb5_free_creds(context, creds_out);
      } else {
            krb5_free_cred_contents(context, &creds);
      }

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

      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_P(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 or Heimdal version */
      krb5_get_init_creds_opt_free(context, opt);
#else
      /* Heimdal version */
      krb5_get_init_creds_opt_free(opt);
#endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */

#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_enctype smb_get_enctype_from_kt_entry(const krb5_keytab_entry *kt_entry)
{
#ifdef HAVE_KRB5_KEYTAB_ENTRY_KEY         /* MIT */
      return kt_entry->key.enctype;
#elif defined(HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK)  /* Heimdal */
      return kt_entry->keyblock.keytype;
#else
#error UNKNOWN_KRB5_KEYTAB_ENTRY_KEYBLOCK_FORMAT
#endif
}


/* caller needs to free etype_s */
 krb5_error_code smb_krb5_enctype_to_string(krb5_context context, 
                                  krb5_enctype enctype, 
                                  char **etype_s)
{
#ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
      return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
#elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
      char buf[256];
      krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
      if (ret) {
            return ret;
      }
      *etype_s = SMB_STRDUP(buf);
      if (!*etype_s) {
            return ENOMEM;
      }
      return ret;
#else
#error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
#endif
}

 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
}

/**********************************************************************
 * Open a krb5 keytab with flags, handles readonly or readwrite access and
 * allows to process non-default keytab names.
 * @param context krb5_context 
 * @param keytab_name_req string
 * @param write_access bool if writable keytab is required
 * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
 * @return krb5_error_code
**********************************************************************/

/* This MAX_NAME_LEN is a constant defined in krb5.h */
#ifndef MAX_KEYTAB_NAME_LEN
#define MAX_KEYTAB_NAME_LEN 1100
#endif

 krb5_error_code smb_krb5_open_keytab(krb5_context context,
                              const char *keytab_name_req,
                              bool write_access,
                              krb5_keytab *keytab)
{
      krb5_error_code ret = 0;
      TALLOC_CTX *mem_ctx;
      char keytab_string[MAX_KEYTAB_NAME_LEN];
      char *kt_str = NULL;
      bool found_valid_name = False;
      const char *pragma = "FILE";
      const char *tmp = NULL;

      if (!write_access && !keytab_name_req) {
            /* caller just wants to read the default keytab readonly, so be it */
            return krb5_kt_default(context, keytab);
      }

      mem_ctx = talloc_init("smb_krb5_open_keytab");
      if (!mem_ctx) {
            return ENOMEM;
      }

#ifdef HAVE_WRFILE_KEYTAB 
      if (write_access) {
            pragma = "WRFILE";
      }
#endif

      if (keytab_name_req) {

            if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
                  ret = KRB5_CONFIG_NOTENUFSPACE;
                  goto out;
            }

            if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) || 
                (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
                  tmp = keytab_name_req;
                  goto resolve;
            }

            if (keytab_name_req[0] != '/') {
                  ret = KRB5_KT_BADNAME;
                  goto out;
            }

            tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
            if (!tmp) {
                  ret = ENOMEM;
                  goto out;
            }

            goto resolve;
      }

      /* we need to handle more complex keytab_strings, like:
       * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */

      ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
      if (ret) {
            goto out;
      }

      DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));

      tmp = talloc_strdup(mem_ctx, keytab_string);
      if (!tmp) {
            ret = ENOMEM;
            goto out;
      }

      if (strncmp(tmp, "ANY:", 4) == 0) {
            tmp += 4;
      }

      memset(&keytab_string, '\0', sizeof(keytab_string));

      while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
            if (strncmp(kt_str, "WRFILE:", 7) == 0) {
                  found_valid_name = True;
                  tmp = kt_str;
                  tmp += 7;
            }

            if (strncmp(kt_str, "FILE:", 5) == 0) {
                  found_valid_name = True;
                  tmp = kt_str;
                  tmp += 5;
            }

            if (found_valid_name) {
                  if (tmp[0] != '/') {
                        ret = KRB5_KT_BADNAME;
                        goto out;
                  }

                  tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
                  if (!tmp) {
                        ret = ENOMEM;
                        goto out;
                  }
                  break;
            }
      }

      if (!found_valid_name) {
            ret = KRB5_KT_UNKNOWN_TYPE;
            goto out;
      }

 resolve:
      DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
      ret = krb5_kt_resolve(context, tmp, keytab);

 out:
      TALLOC_FREE(mem_ctx);
      return ret;
}

#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

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