lib/gssapi/krb5/encapsulate.c

   1 /*
   2  * Copyright (c) 1997 - 2000 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 "gssapi_locl.h"
  35
  36 RCSID("$Id$");
  37
  38 void
  39 gssapi_krb5_encap_length (size_t data_len,
  40                           size_t *len,
  41                           size_t *total_len)
  42 {
  43     size_t len_len;
  44
  45     *len = 1 + 1 + GSS_KRB5_MECHANISM->length + 2 + data_len;
  46
  47     len_len = length_len(*len);
  48
  49     *total_len = 1 + len_len + *len;
  50 }
  51
  52 u_char *
  53 gssapi_krb5_make_header (u_char *p,
  54                          size_t len,
  55                          u_char *type)
  56 {
  57     int e;
  58     size_t len_len, foo;
  59
  60     *p++ = 0x60;
  61     len_len = length_len(len);
  62     e = der_put_length (p + len_len - 1, len_len, len, &foo);
  63     if(e || foo != len_len)
  64         abort ();
  65     p += len_len;
  66     *p++ = 0x06;
  67     *p++ = GSS_KRB5_MECHANISM->length;
  68     memcpy (p, GSS_KRB5_MECHANISM->elements, GSS_KRB5_MECHANISM->length);
  69     p += GSS_KRB5_MECHANISM->length;
  70     memcpy (p, type, 2);
  71     p += 2;
  72     return p;
  73 }
  74
  75 /*
  76  * Give it a krb5_data and it will encapsulate with extra GSS-API wrappings.
  77  */
  78
  79 OM_uint32
  80 gssapi_krb5_encapsulate(
  81                         const krb5_data *in_data,
  82                         gss_buffer_t output_token,
  83                         u_char *type
  84 )
  85 {
  86     size_t len, outer_len;
  87     u_char *p;
  88
  89     gssapi_krb5_encap_length (in_data->length, &len, &outer_len);
  90
  91     output_token->length = outer_len;
  92     output_token->value  = malloc (outer_len);
  93     if (output_token->value == NULL)
  94         return GSS_S_FAILURE;
  95
  96     p = gssapi_krb5_make_header (output_token->value, len, type);
  97     memcpy (p, in_data->data, in_data->length);
  98     return GSS_S_COMPLETE;
  99 }