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

   1 /*      $NetBSD: mk_priv.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_priv(krb5_context context,
  40              krb5_auth_context auth_context,
  41              const krb5_data *userdata,
  42              krb5_data *outbuf,
  43              krb5_replay_data *outdata)
  44 {
  45     krb5_error_code ret;
  46     KRB_PRIV s;
  47     EncKrbPrivPart part;
  48     u_char *buf = NULL;
  49     size_t buf_size;
  50     size_t len = 0;
  51     krb5_crypto crypto;
  52     krb5_keyblock *key;
  53     krb5_replay_data rdata;
  54
  55     if ((auth_context->flags &
  56          (KRB5_AUTH_CONTEXT_RET_TIME | KRB5_AUTH_CONTEXT_RET_SEQUENCE)) &&
  57         outdata == NULL)
  58         return KRB5_RC_REQUIRED; /* XXX better error, MIT returns this */
  59
  60     if (auth_context->local_subkey)
  61         key = auth_context->local_subkey;
  62     else if (auth_context->remote_subkey)
  63         key = auth_context->remote_subkey;
  64     else
  65         key = auth_context->keyblock;
  66
  67     memset(&rdata, 0, sizeof(rdata));
  68
  69     part.user_data = *userdata;
  70
  71     krb5_us_timeofday (context, &rdata.timestamp, &rdata.usec);
  72
  73     if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) {
  74         part.timestamp = &rdata.timestamp;
  75         part.usec      = &rdata.usec;
  76     } else {
  77         part.timestamp = NULL;
  78         part.usec      = NULL;
  79     }
  80
  81     if (auth_context->flags & KRB5_AUTH_CONTEXT_RET_TIME) {
  82         outdata->timestamp = rdata.timestamp;
  83         outdata->usec = rdata.usec;
  84     }
  85
  86     if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) {
  87         rdata.seq = auth_context->local_seqnumber;
  88         part.seq_number = &rdata.seq;
  89     } else
  90         part.seq_number = NULL;
  91
  92     if (auth_context->flags & KRB5_AUTH_CONTEXT_RET_SEQUENCE)
  93         outdata->seq = auth_context->local_seqnumber;
  94
  95     part.s_address = auth_context->local_address;
  96     part.r_address = auth_context->remote_address;
  97
  98     krb5_data_zero (&s.enc_part.cipher);
  99
 100     ASN1_MALLOC_ENCODE(EncKrbPrivPart, buf, buf_size, &part, &len, ret);
 101     if (ret)
 102         goto fail;
 103     if (buf_size != len)
 104         krb5_abortx(context, "internal error in ASN.1 encoder");
 105
 106     s.pvno = 5;
 107     s.msg_type = krb_priv;
 108     s.enc_part.etype = key->keytype;
 109     s.enc_part.kvno = NULL;
 110
 111     ret = krb5_crypto_init(context, key, 0, &crypto);
 112     if (ret) {
 113         free (buf);
 114         return ret;
 115     }
 116     ret = krb5_encrypt (context,
 117                         crypto,
 118                         KRB5_KU_KRB_PRIV,
 119                         buf + buf_size - len,
 120                         len,
 121                         &s.enc_part.cipher);
 122     krb5_crypto_destroy(context, crypto);
 123     if (ret) {
 124         free(buf);
 125         return ret;
 126     }
 127     free(buf);
 128
 129
 130     ASN1_MALLOC_ENCODE(KRB_PRIV, buf, buf_size, &s, &len, ret);
 131     if (ret)
 132         goto fail;
 133     if (buf_size != len)
 134         krb5_abortx(context, "internal error in ASN.1 encoder");
 135
 136     krb5_data_free (&s.enc_part.cipher);
 137
 138     ret = krb5_data_copy(outbuf, buf + buf_size - len, len);
 139     if (ret) {
 140         krb5_set_error_message(context, ENOMEM,
 141                                N_("malloc: out of memory", ""));
 142         free(buf);
 143         return ENOMEM;
 144     }
 145     free (buf);
 146     if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE)
 147         auth_context->local_seqnumber =
 148             (auth_context->local_seqnumber + 1) & 0xFFFFFFFF;
 149     return 0;
 150
 151   fail:
 152     free (buf);
 153     krb5_data_free (&s.enc_part.cipher);
 154     return ret;
 155 }