text: /*
   * Copyright (c) 1997 - 2004 Kungliga Tekniska Högskolan
   * (Royal Institute of Technology, Stockholm, Sweden).
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * 3. Neither the name of the Institute nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #include "krb5_locl.h"
  #include "krb5-v4compat.h"
  
  #ifndef HEIMDAL_SMALLER
  
  static krb5_error_code
  check_ticket_flags(TicketFlags f)
  {
      return 0; /* maybe add some more tests here? */
  }
  
  /**
   * Convert the v5 credentials in in_cred to v4-dito in v4creds.  This
   * is done by sending them to the 524 function in the KDC.  If
   * `in_cred' doesn't contain a DES session key, then a new one is
   * gotten from the KDC and stored in the cred cache `ccache'.
   *
   * @param context Kerberos 5 context.
   * @param in_cred the credential to convert
   * @param v4creds the converted credential
   *
   * @return Returns 0 to indicate success. Otherwise an kerberos et
   * error code is returned, see krb5_get_error_message().
   *
   * @ingroup krb5_v4compat
   */
  
  krb5_error_code KRB5_LIB_FUNCTION
  krb524_convert_creds_kdc(krb5_context context,
  			 krb5_creds *in_cred,
  			 struct credentials *v4creds)
  {
      krb5_error_code ret;
      krb5_data reply;
      krb5_storage *sp;
      int32_t tmp;
      krb5_data ticket;
      char realm[REALM_SZ];
      krb5_creds *v5_creds = in_cred;
  
      ret = check_ticket_flags(v5_creds->flags.b);
      if(ret)
  	goto out2;
  
      {
  	krb5_krbhst_handle handle;
  
  	ret = krb5_krbhst_init(context,
  			       krb5_principal_get_realm(context,
  							v5_creds->server),
  			       KRB5_KRBHST_KRB524,
  			       &handle);
  	if (ret)
  	    goto out2;
  
  	ret = krb5_sendto (context,
  			   &v5_creds->ticket,
  			   handle,
  			   &reply);
  	krb5_krbhst_free(context, handle);
  	if (ret)
  	    goto out2;
      }
      sp = krb5_storage_from_mem(reply.data, reply.length);
      if(sp == NULL) {
  	ret = ENOMEM;
  	krb5_set_error_message (context, ENOMEM, N_("malloc: out of memory", ""));
  	goto out2;
      }
      krb5_ret_int32(sp, &tmp);
      ret = tmp;
      if(ret == 0) {
  	memset(v4creds, 0, sizeof(*v4creds));
  	ret = krb5_ret_int32(sp, &tmp);
  	if(ret)
  	    goto out;
  	v4creds->kvno = tmp;
  	ret = krb5_ret_data(sp, &ticket);
  	if(ret)
  	    goto out;
  	v4creds->ticket_st.length = ticket.length;
  	memcpy(v4creds->ticket_st.dat, ticket.data, ticket.length);
  	krb5_data_free(&ticket);
  	ret = krb5_524_conv_principal(context,
  				      v5_creds->server,
  				      v4creds->service,
  				      v4creds->instance,
  				      v4creds->realm);
  	if(ret)
  	    goto out;
  	v4creds->issue_date = v5_creds->times.starttime;
  	v4creds->lifetime = _krb5_krb_time_to_life(v4creds->issue_date,
  						   v5_creds->times.endtime);
  	ret = krb5_524_conv_principal(context, v5_creds->client,
  				      v4creds->pname,
  				      v4creds->pinst,
  				      realm);
  	if(ret)
  	    goto out;
  	memcpy(v4creds->session, v5_creds->session.keyvalue.data, 8);
      } else {
  	krb5_set_error_message (context, ret,
  				N_("converting credentials: %s",
  				  "already localized"),
  				krb5_get_err_text(context, ret));
      }
  out:
      krb5_storage_free(sp);
      krb5_data_free(&reply);
  out2:
      if (v5_creds != in_cred)
  	krb5_free_creds (context, v5_creds);
      return ret;
  }
  
  /**
   * Convert the v5 credentials in in_cred to v4-dito in v4creds,
   * check the credential cache ccache before checking with the KDC.
   *
   * @param context Kerberos 5 context.
   * @param ccache credential cache used to check for des-ticket.
   * @param in_cred the credential to convert
   * @param v4creds the converted credential
   *
   * @return Returns 0 to indicate success. Otherwise an kerberos et
   * error code is returned, see krb5_get_error_message().
   *
   * @ingroup krb5_v4compat
   */
  
  krb5_error_code KRB5_LIB_FUNCTION
  krb524_convert_creds_kdc_ccache(krb5_context context,
  				krb5_ccache ccache,
  				krb5_creds *in_cred,
  				struct credentials *v4creds)
  {
      krb5_error_code ret;
      krb5_creds *v5_creds = in_cred;
      krb5_keytype keytype;
  
      keytype = v5_creds->session.keytype;
  
      if (keytype != ENCTYPE_DES_CBC_CRC) {
  	/* MIT krb524d doesn't like nothing but des-cbc-crc tickets,
             so go get one */
  	krb5_creds template;
  
  	memset (&template, 0, sizeof(template));
  	template.session.keytype = ENCTYPE_DES_CBC_CRC;
  	ret = krb5_copy_principal (context, in_cred->client, &template.client);
  	if (ret) {
  	    krb5_free_cred_contents (context, &template);
  	    return ret;
  	}
  	ret = krb5_copy_principal (context, in_cred->server, &template.server);
  	if (ret) {
  	    krb5_free_cred_contents (context, &template);
  	    return ret;
  	}
  
  	ret = krb5_get_credentials (context, 0, ccache,
  				    &template, &v5_creds);
  	krb5_free_cred_contents (context, &template);
  	if (ret)
  	    return ret;
      }
  
      ret = krb524_convert_creds_kdc(context, v5_creds, v4creds);
  
      if (v5_creds != in_cred)
  	krb5_free_creds (context, v5_creds);
      return ret;
  }
  
  #endif
  