lib/krb5/mk_priv.c

   1 /*
   2  * Copyright (c) 1997 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. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by Kungliga Tekniska
  20  *      Högskolan and its contributors.
  21  *
  22  * 4. Neither the name of the Institute nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 #include <krb5_locl.h>
  40
  41 RCSID("$Id$");
  42
  43 krb5_error_code
  44 krb5_mk_priv(krb5_context context,
  45              krb5_auth_context auth_context,
  46              const krb5_data *userdata,
  47              krb5_data *outbuf,
  48              /*krb5_replay_data*/ void *outdata)
  49 {
  50   krb5_error_code r;
  51   KRB_PRIV s;
  52   EncKrbPrivPart part;
  53   u_char buf[1024];
  54   size_t len;
  55   unsigned tmp_seq;
  56   krb5_keyblock *key;
  57   int32_t sec, usec;
  58   KerberosTime sec2;
  59   unsigned usec2;
  60   krb5_enctype enctype;
  61
  62   /* XXX - Is this right? */
  63
  64   if (auth_context->local_subkey.keytype)
  65       key = &auth_context->local_subkey;
  66   else if (auth_context->remote_subkey.keytype)
  67       key = &auth_context->remote_subkey;
  68   else
  69       key = auth_context->keyblock;
  70
  71   if (auth_context->enctype)
  72       enctype = auth_context->enctype;
  73   else {
  74       r = krb5_keytype_to_etype (context, key->keytype, &enctype);
  75       if (r)
  76           return r;
  77   }
  78
  79   krb5_us_timeofday (context, &sec, &usec);
  80
  81   part.user_data = *userdata;
  82   sec2 = sec;
  83   part.timestamp  = &sec2;
  84   usec2 = usec;
  85   part.usec       = &usec2;
  86   if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) {
  87     tmp_seq = ++auth_context->local_seqnumber;
  88     part.seq_number = &tmp_seq;
  89   } else {
  90     part.seq_number = NULL;
  91   }
  92
  93   part.s_address = auth_context->local_address;
  94   part.r_address = auth_context->remote_address;
  95
  96   r = encode_EncKrbPrivPart (buf + sizeof(buf) - 1, sizeof(buf), &part, &len);
  97   if (r)
  98       return r;
  99
 100   s.pvno = 5;
 101   s.msg_type = krb_priv;
 102   s.enc_part.etype = enctype;
 103   s.enc_part.kvno = NULL;
 104
 105   r = krb5_encrypt (context, buf + sizeof(buf) - len, len,
 106                     enctype, key, &s.enc_part.cipher);
 107   if (r)
 108     return r;
 109
 110   r = encode_KRB_PRIV (buf + sizeof(buf) - 1, sizeof(buf), &s, &len);
 111   krb5_data_free (&s.enc_part.cipher);
 112   if (r)
 113     return r;
 114   outbuf->length = len;
 115   outbuf->data   = malloc (len);
 116   if (outbuf->data == NULL)
 117     return ENOMEM;
 118   memcpy (outbuf->data, buf + sizeof(buf) - len, len);
 119   return 0;
 120 }