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/*
* seal.c --- seal message
*
* $Source$
* $Author$
* $Header$
*
* Copyright 1991 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America is assumed
* to require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
*/
#include <gssapi.h>
OM_uint32 gss_unseal(minor_status, context, input_message_buffer,
output_message_buffer, conf_state, qop_state)
OM_uint32 *minor_status;
gss_ctx_id_t context;
gss_buffer_t input_message_buffer;
gss_buffer_t output_message_buffer;
int *conf_state;
int *qop_state;
{
OM_uint32 retval;
krb5_data inbuf, outbuf;
int token_type;
*minor_status = 0;
if (retval = gss_check_token(minor_status, input_message_buffer,
GSS_API_KRB5_TYPE, 0))
return(retval);
token_type = ((char *) input_message_buffer->value)[2];
if ((token_type != GSS_API_KRB5_SAFE) &&
(token_type != GSS_API_KRB5_PRIV))
return(GSS_S_DEFECTIVE_TOKEN);
inbuf.length = input_message_buffer->length-4;
inbuf.data = ( (char *) input_message_buffer->value)+4;
if (token_type == GSS_API_KRB5_PRIV) {
int priv_flags = 0;
int eblock_size;
char *i_vector;
if (context->flags & GSS_C_SEQUENCE_FLAG)
priv_flags = KRB5_PRIV_DOSEQUENCE|KRB5_PRIV_NOTIME;
/*
* Initialize the initial vector.
*/
eblock_size =
krb5_keytype_array[context->session_key->keytype]->
system->block_length;
if (!(i_vector=malloc(eblock_size))) {
return(GSS_S_FAILURE);
}
memset(i_vector, 0, eblock_size);
if (*minor_status = krb5_rd_priv(&inbuf,
context->session_key,
&context->his_address,
&context->my_address,
context->his_seq_num,
priv_flags,
i_vector,
0, /* no rcache */
&outbuf))
return(GSS_S_FAILURE);
if (conf_state)
*conf_state = 1;
} else {
int safe_flags = 0;
if (context->flags & GSS_C_SEQUENCE_FLAG)
safe_flags = KRB5_SAFE_DOSEQUENCE|KRB5_SAFE_NOTIME;
if (*minor_status = krb5_rd_safe(&inbuf,
context->session_key,
&context->his_address,
&context->my_address,
context->his_seq_num,
safe_flags,
0, /* no rcache */
&outbuf))
return(GSS_S_FAILURE);
if (conf_state)
*conf_state = 0;
}
if (qop_state)
*qop_state = 0;
output_message_buffer->length = outbuf.length;
output_message_buffer->value = outbuf.data;
return(GSS_S_COMPLETE);
}
#ifdef notdef
OM_uint32 gss_verify(minor_status, context, message_buffer,
token_buffer, qop_state)
OM_uint32 *minor_status;
gss_ctx_id_t context;
gss_buffer_t message_buffer;
gss_buffer_t token_buffer;
int *qop_state;
{
OM_uint32 retval, ret;
gss_buffer_desc buf;
gss_buffer_t output_message_buffer = &buf;
if (retval = gss_unseal(minor_status, context, message_buffer,
output_message_buffer, NULL, qop_state))
return(retval);
if (token_buffer->length != output_message_buffer->length)
ret = GSS_S_BAD_SIG;
else if (!memcmp(token_buffer->value, output_message_buffer->value,
token_buffer->length))
ret = GSS_S_BAD_SIG;
if (retval = gss_release_buffer(minor_status, output_message_buffer))
return(retval);
return(ret);
}
#endif
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