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/*
* Copyright (c) 1997 - 2003 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 "krb5_locl.h"
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_mk_safe(krb5_context context,
krb5_auth_context auth_context,
const krb5_data *userdata,
krb5_data *outbuf,
krb5_replay_data *outdata)
{
krb5_error_code ret;
KRB_SAFE s;
u_char *buf = NULL;
size_t buf_size;
size_t len = 0;
krb5_crypto crypto;
krb5_keyblock *key;
krb5_replay_data rdata;
if ((auth_context->flags &
(KRB5_AUTH_CONTEXT_RET_TIME | KRB5_AUTH_CONTEXT_RET_SEQUENCE)) &&
outdata == NULL)
return KRB5_RC_REQUIRED; /* XXX better error, MIT returns this */
if (auth_context->local_subkey)
key = auth_context->local_subkey;
else if (auth_context->remote_subkey)
key = auth_context->remote_subkey;
else
key = auth_context->keyblock;
s.pvno = 5;
s.msg_type = krb_safe;
memset(&rdata, 0, sizeof(rdata));
s.safe_body.user_data = *userdata;
krb5_us_timeofday (context, &rdata.timestamp, &rdata.usec);
if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) {
s.safe_body.timestamp = &rdata.timestamp;
s.safe_body.usec = &rdata.usec;
} else {
s.safe_body.timestamp = NULL;
s.safe_body.usec = NULL;
}
if (auth_context->flags & KRB5_AUTH_CONTEXT_RET_TIME) {
outdata->timestamp = rdata.timestamp;
outdata->usec = rdata.usec;
}
if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) {
rdata.seq = auth_context->local_seqnumber;
s.safe_body.seq_number = &rdata.seq;
} else
s.safe_body.seq_number = NULL;
if (auth_context->flags & KRB5_AUTH_CONTEXT_RET_SEQUENCE)
outdata->seq = auth_context->local_seqnumber;
s.safe_body.s_address = auth_context->local_address;
s.safe_body.r_address = auth_context->remote_address;
s.cksum.cksumtype = 0;
s.cksum.checksum.data = NULL;
s.cksum.checksum.length = 0;
ASN1_MALLOC_ENCODE(KRB_SAFE, buf, buf_size, &s, &len, ret);
if (ret)
return ret;
if(buf_size != len)
krb5_abortx(context, "internal error in ASN.1 encoder");
ret = krb5_crypto_init(context, key, 0, &crypto);
if (ret) {
free (buf);
return ret;
}
ret = krb5_create_checksum(context,
crypto,
KRB5_KU_KRB_SAFE_CKSUM,
0,
buf,
len,
&s.cksum);
krb5_crypto_destroy(context, crypto);
if (ret) {
free (buf);
return ret;
}
free(buf);
ASN1_MALLOC_ENCODE(KRB_SAFE, buf, buf_size, &s, &len, ret);
free_Checksum (&s.cksum);
if(ret)
return ret;
if(buf_size != len)
krb5_abortx(context, "internal error in ASN.1 encoder");
outbuf->length = len;
outbuf->data = buf;
if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE)
auth_context->local_seqnumber =
(auth_context->local_seqnumber + 1) & 0xFFFFFFFF;
return 0;
}
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