lib/gssapi/krb5/encapsulate.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 "gssapi_locl.h"
  40
  41 RCSID("$Id$");
  42
  43 void
  44 gssapi_krb5_encap_length (size_t data_len,
  45                           size_t *len,
  46                           size_t *total_len)
  47 {
  48     size_t len_len;
  49
  50     *len = 1 + 1 + GSS_KRB5_MECHANISM->length + 2 + data_len;
  51
  52     len_len = length_len(*len);
  53
  54     *total_len = 1 + len_len + *len;
  55 }
  56
  57 u_char *
  58 gssapi_krb5_make_header (u_char *p,
  59                          size_t len,
  60                          u_char *type)
  61 {
  62     int e;
  63     size_t len_len, foo;
  64
  65     *p++ = 0x60;
  66     len_len = length_len(len);
  67     e = der_put_length (p + len_len - 1, len_len, len, &foo);
  68     if(e || foo != len_len)
  69         abort ();
  70     p += len_len;
  71     *p++ = 0x06;
  72     *p++ = GSS_KRB5_MECHANISM->length;
  73     memcpy (p, GSS_KRB5_MECHANISM->elements, GSS_KRB5_MECHANISM->length);
  74     p += GSS_KRB5_MECHANISM->length;
  75     memcpy (p, type, 2);
  76     p += 2;
  77     return p;
  78 }
  79
  80 /*
  81  * Give it a krb5_data and it will encapsulate with extra GSS-API wrappings.
  82  */
  83
  84 OM_uint32
  85 gssapi_krb5_encapsulate(
  86                         krb5_data *in_data,
  87                         gss_buffer_t output_token,
  88                         u_char *type
  89 )
  90 {
  91     size_t len, outer_len;
  92     u_char *p;
  93
  94     gssapi_krb5_encap_length (in_data->length, &len, &outer_len);
  95
  96     output_token->length = outer_len;
  97     output_token->value  = malloc (outer_len);
  98     if (output_token->value == NULL)
  99         return GSS_S_FAILURE;
 100
 101     p = gssapi_krb5_make_header (output_token->value, len, type);
 102     memcpy (p, in_data->data, in_data->length);
 103     krb5_data_free (in_data);
 104     return GSS_S_COMPLETE;
 105 }