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121 lines
3.7 KiB
C
121 lines
3.7 KiB
C
/*
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* Copyright (c) 1997 - 2000 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <krb5_locl.h>
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RCSID("$Id: mk_rep.c,v 1.18 2000/12/06 20:57:23 joda Exp $");
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krb5_error_code
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krb5_mk_rep(krb5_context context,
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krb5_auth_context auth_context,
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krb5_data *outbuf)
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{
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krb5_error_code ret;
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AP_REP ap;
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EncAPRepPart body;
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u_char *buf = NULL;
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size_t buf_size;
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size_t len;
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krb5_crypto crypto;
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ap.pvno = 5;
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ap.msg_type = krb_ap_rep;
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memset (&body, 0, sizeof(body));
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body.ctime = auth_context->authenticator->ctime;
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body.cusec = auth_context->authenticator->cusec;
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body.subkey = NULL;
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if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) {
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krb5_generate_seq_number (context,
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auth_context->keyblock,
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&auth_context->local_seqnumber);
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body.seq_number = malloc (sizeof(*body.seq_number));
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if (body.seq_number == NULL)
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return ENOMEM;
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*(body.seq_number) = auth_context->local_seqnumber;
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} else
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body.seq_number = NULL;
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ap.enc_part.etype = auth_context->keyblock->keytype;
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ap.enc_part.kvno = NULL;
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buf_size = length_EncAPRepPart(&body);
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buf = malloc (buf_size);
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if (buf == NULL) {
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free_EncAPRepPart (&body);
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return ENOMEM;
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}
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ret = krb5_encode_EncAPRepPart (context,
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buf + buf_size - 1,
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buf_size,
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&body,
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&len);
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free_EncAPRepPart (&body);
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ret = krb5_crypto_init(context, auth_context->keyblock,
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0 /* ap.enc_part.etype */, &crypto);
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if (ret) {
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free (buf);
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return ret;
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}
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ret = krb5_encrypt (context,
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crypto,
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KRB5_KU_AP_REQ_ENC_PART,
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buf + buf_size - len,
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len,
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&ap.enc_part.cipher);
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krb5_crypto_destroy(context, crypto);
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if (ret) {
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free(buf);
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return ret;
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}
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buf_size = length_AP_REP(&ap);
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buf = realloc(buf, buf_size);
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if(buf == NULL) {
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free_AP_REP (&ap);
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return ENOMEM;
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}
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ret = encode_AP_REP (buf + buf_size - 1, buf_size, &ap, &len);
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free_AP_REP (&ap);
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if(len != buf_size)
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krb5_abortx(context, "krb5_mk_rep: encoded length != calculated length");
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outbuf->data = buf;
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outbuf->length = len;
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return 0;
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}
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