crypto/external/bsd/heimdal/dist/lib/krb5/mk_rep.c

   1 /*      $NetBSD: mk_rep.c,v 1.1.1.2 2014/04/24 12:45:50 pettai Exp $    */
   2
   3 /*
   4  * Copyright (c) 1997 - 2003 Kungliga Tekniska Högskolan
   5  * (Royal Institute of Technology, Stockholm, Sweden).
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include "krb5_locl.h"
  37
  38 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
  39 krb5_mk_rep(krb5_context context,
  40             krb5_auth_context auth_context,
  41             krb5_data *outbuf)
  42 {
  43     krb5_error_code ret;
  44     AP_REP ap;
  45     EncAPRepPart body;
  46     u_char *buf = NULL;
  47     size_t buf_size;
  48     size_t len = 0;
  49     krb5_crypto crypto;
  50
  51     ap.pvno = 5;
  52     ap.msg_type = krb_ap_rep;
  53
  54     memset (&body, 0, sizeof(body));
  55
  56     body.ctime = auth_context->authenticator->ctime;
  57     body.cusec = auth_context->authenticator->cusec;
  58     if (auth_context->flags & KRB5_AUTH_CONTEXT_USE_SUBKEY) {
  59         if (auth_context->local_subkey == NULL) {
  60             ret = krb5_auth_con_generatelocalsubkey(context,
  61                                                     auth_context,
  62                                                     auth_context->keyblock);
  63             if(ret) {
  64                 free_EncAPRepPart(&body);
  65                 return ret;
  66             }
  67         }
  68         ret = krb5_copy_keyblock(context, auth_context->local_subkey,
  69                                  &body.subkey);
  70         if (ret) {
  71             free_EncAPRepPart(&body);
  72             krb5_set_error_message(context, ENOMEM,
  73                                    N_("malloc: out of memory", ""));
  74             return ENOMEM;
  75         }
  76     } else
  77         body.subkey = NULL;
  78     if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) {
  79         if(auth_context->local_seqnumber == 0)
  80             krb5_generate_seq_number (context,
  81                                       auth_context->keyblock,
  82                                       &auth_context->local_seqnumber);
  83         ALLOC(body.seq_number, 1);
  84         if (body.seq_number == NULL) {
  85             krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
  86             free_EncAPRepPart(&body);
  87             return ENOMEM;
  88         }
  89         *(body.seq_number) = auth_context->local_seqnumber;
  90     } else
  91         body.seq_number = NULL;
  92
  93     ap.enc_part.etype = auth_context->keyblock->keytype;
  94     ap.enc_part.kvno  = NULL;
  95
  96     ASN1_MALLOC_ENCODE(EncAPRepPart, buf, buf_size, &body, &len, ret);
  97     free_EncAPRepPart (&body);
  98     if(ret)
  99         return ret;
 100     if (buf_size != len)
 101         krb5_abortx(context, "internal error in ASN.1 encoder");
 102     ret = krb5_crypto_init(context, auth_context->keyblock,
 103                            0 /* ap.enc_part.etype */, &crypto);
 104     if (ret) {
 105         free (buf);
 106         return ret;
 107     }
 108     ret = krb5_encrypt (context,
 109                         crypto,
 110                         KRB5_KU_AP_REQ_ENC_PART,
 111                         buf + buf_size - len,
 112                         len,
 113                         &ap.enc_part.cipher);
 114     krb5_crypto_destroy(context, crypto);
 115     free(buf);
 116     if (ret)
 117         return ret;
 118
 119     ASN1_MALLOC_ENCODE(AP_REP, outbuf->data, outbuf->length, &ap, &len, ret);
 120     if (ret == 0 && outbuf->length != len)
 121         krb5_abortx(context, "internal error in ASN.1 encoder");
 122     free_AP_REP (&ap);
 123     return ret;
 124 }