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/*
* Copyright (c) 1997 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "gssapi_locl.h"
RCSID("$Id: decapsulate.c,v 1.5 1999/12/02 17:05:03 joda Exp $");
OM_uint32
gssapi_krb5_verify_header(u_char **str,
size_t total_len,
char *type)
{
size_t len, len_len, mech_len, foo;
int e;
u_char *p = *str;
if (*p++ != 0x60)
return GSS_S_DEFECTIVE_TOKEN;
e = der_get_length (p, total_len - 1, &len, &len_len);
if (e || 1 + len_len + len != total_len)
abort ();
p += len_len;
if (*p++ != 0x06)
return GSS_S_DEFECTIVE_TOKEN;
e = der_get_length (p, total_len - 1 - len_len - 1,
&mech_len, &foo);
if (e)
abort ();
p += foo;
if (mech_len != GSS_KRB5_MECHANISM->length)
return GSS_S_BAD_MECH;
if (memcmp(p,
GSS_KRB5_MECHANISM->elements,
GSS_KRB5_MECHANISM->length) != 0)
return GSS_S_BAD_MECH;
p += mech_len;
if (memcmp (p, type, 2) != 0)
return GSS_S_DEFECTIVE_TOKEN;
p += 2;
*str = p;
return GSS_S_COMPLETE;
}
/*
* Remove the GSS-API wrapping from `in_token' giving `out_data.
* Does not copy data, so just free `in_token'.
*/
OM_uint32
gssapi_krb5_decapsulate(
gss_buffer_t input_token_buffer,
krb5_data *out_data,
char *type
)
{
u_char *p;
OM_uint32 ret;
p = input_token_buffer->value;
ret = gssapi_krb5_verify_header(&p,
input_token_buffer->length,
type);
if (ret)
return ret;
out_data->length = input_token_buffer->length -
(p - (u_char *)input_token_buffer->value);
out_data->data = p;
return GSS_S_COMPLETE;
}
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