lib/krb5/mk_error.c

   1 /*
   2  * Copyright (c) 1997 - 2003 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "krb5_locl.h"
  35
  36 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
  37 krb5_mk_error(krb5_context context,
  38               krb5_error_code error_code,
  39               const char *e_text,
  40               const krb5_data *e_data,
  41               const krb5_principal client,
  42               const krb5_principal server,
  43               time_t *client_time,
  44               int *client_usec,
  45               krb5_data *reply)
  46 {
  47     const char *e_text2 = NULL;
  48     KRB_ERROR msg;
  49     krb5_timestamp sec;
  50     int32_t usec;
  51     size_t len = 0;
  52     krb5_error_code ret = 0;
  53
  54     krb5_us_timeofday (context, &sec, &usec);
  55
  56     memset(&msg, 0, sizeof(msg));
  57     msg.pvno     = 5;
  58     msg.msg_type = krb_error;
  59     msg.stime    = sec;
  60     msg.susec    = usec;
  61     msg.ctime    = client_time;
  62     msg.cusec    = client_usec;
  63     /* Make sure we only send `protocol' error codes */
  64     if(error_code < KRB5KDC_ERR_NONE || error_code >= KRB5_ERR_RCSID) {
  65         if(e_text == NULL)
  66             e_text = e_text2 = krb5_get_error_message(context, error_code);
  67         error_code = KRB5KRB_ERR_GENERIC;
  68     }
  69     msg.error_code = error_code - KRB5KDC_ERR_NONE;
  70     if (e_text)
  71         msg.e_text = rk_UNCONST(&e_text);
  72     if (e_data)
  73         msg.e_data = rk_UNCONST(e_data);
  74     if(server){
  75         msg.realm = server->realm;
  76         msg.sname = server->name;
  77     }else{
  78         static char unspec[] = "<unspecified realm>";
  79         msg.realm = unspec;
  80     }
  81     if(client){
  82         msg.crealm = &client->realm;
  83         msg.cname = &client->name;
  84     }
  85
  86     ASN1_MALLOC_ENCODE(KRB_ERROR, reply->data, reply->length, &msg, &len, ret);
  87     if (e_text2)
  88         krb5_free_error_message(context, e_text2);
  89     if (ret)
  90         return ret;
  91     if(reply->length != len)
  92         krb5_abortx(context, "internal error in ASN.1 encoder");
  93     return 0;
  94 }