mk_rep.c revision 72445
155682Smarkm/* 272445Sassar * Copyright (c) 1997 - 2000 Kungliga Tekniska H�gskolan 355682Smarkm * (Royal Institute of Technology, Stockholm, Sweden). 455682Smarkm * All rights reserved. 555682Smarkm * 655682Smarkm * Redistribution and use in source and binary forms, with or without 755682Smarkm * modification, are permitted provided that the following conditions 855682Smarkm * are met: 955682Smarkm * 1055682Smarkm * 1. Redistributions of source code must retain the above copyright 1155682Smarkm * notice, this list of conditions and the following disclaimer. 1255682Smarkm * 1355682Smarkm * 2. Redistributions in binary form must reproduce the above copyright 1455682Smarkm * notice, this list of conditions and the following disclaimer in the 1555682Smarkm * documentation and/or other materials provided with the distribution. 1655682Smarkm * 1755682Smarkm * 3. Neither the name of the Institute nor the names of its contributors 1855682Smarkm * may be used to endorse or promote products derived from this software 1955682Smarkm * without specific prior written permission. 2055682Smarkm * 2155682Smarkm * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 2255682Smarkm * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2355682Smarkm * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2455682Smarkm * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 2555682Smarkm * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2655682Smarkm * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2755682Smarkm * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2855682Smarkm * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2955682Smarkm * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3055682Smarkm * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3155682Smarkm * SUCH DAMAGE. 3255682Smarkm */ 3355682Smarkm 3455682Smarkm#include <krb5_locl.h> 3555682Smarkm 3672445SassarRCSID("$Id: mk_rep.c,v 1.18 2000/12/06 20:57:23 joda Exp $"); 3755682Smarkm 3855682Smarkmkrb5_error_code 3955682Smarkmkrb5_mk_rep(krb5_context context, 4072445Sassar krb5_auth_context auth_context, 4155682Smarkm krb5_data *outbuf) 4255682Smarkm{ 4355682Smarkm krb5_error_code ret; 4455682Smarkm AP_REP ap; 4555682Smarkm EncAPRepPart body; 4655682Smarkm u_char *buf = NULL; 4755682Smarkm size_t buf_size; 4855682Smarkm size_t len; 4955682Smarkm krb5_crypto crypto; 5055682Smarkm 5155682Smarkm ap.pvno = 5; 5255682Smarkm ap.msg_type = krb_ap_rep; 5355682Smarkm 5455682Smarkm memset (&body, 0, sizeof(body)); 5555682Smarkm 5672445Sassar body.ctime = auth_context->authenticator->ctime; 5772445Sassar body.cusec = auth_context->authenticator->cusec; 5855682Smarkm body.subkey = NULL; 5972445Sassar if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) { 6055682Smarkm krb5_generate_seq_number (context, 6172445Sassar auth_context->keyblock, 6272445Sassar &auth_context->local_seqnumber); 6355682Smarkm body.seq_number = malloc (sizeof(*body.seq_number)); 6455682Smarkm if (body.seq_number == NULL) 6555682Smarkm return ENOMEM; 6672445Sassar *(body.seq_number) = auth_context->local_seqnumber; 6755682Smarkm } else 6855682Smarkm body.seq_number = NULL; 6955682Smarkm 7072445Sassar ap.enc_part.etype = auth_context->keyblock->keytype; 7155682Smarkm ap.enc_part.kvno = NULL; 7255682Smarkm 7355682Smarkm buf_size = length_EncAPRepPart(&body); 7455682Smarkm buf = malloc (buf_size); 7555682Smarkm if (buf == NULL) { 7655682Smarkm free_EncAPRepPart (&body); 7755682Smarkm return ENOMEM; 7855682Smarkm } 7955682Smarkm 8055682Smarkm ret = krb5_encode_EncAPRepPart (context, 8155682Smarkm buf + buf_size - 1, 8255682Smarkm buf_size, 8355682Smarkm &body, 8455682Smarkm &len); 8555682Smarkm 8655682Smarkm free_EncAPRepPart (&body); 8772445Sassar ret = krb5_crypto_init(context, auth_context->keyblock, 8872445Sassar 0 /* ap.enc_part.etype */, &crypto); 8972445Sassar if (ret) { 9072445Sassar free (buf); 9172445Sassar return ret; 9272445Sassar } 9355682Smarkm ret = krb5_encrypt (context, 9455682Smarkm crypto, 9555682Smarkm KRB5_KU_AP_REQ_ENC_PART, 9655682Smarkm buf + buf_size - len, 9755682Smarkm len, 9855682Smarkm &ap.enc_part.cipher); 9955682Smarkm krb5_crypto_destroy(context, crypto); 10055682Smarkm if (ret) { 10155682Smarkm free(buf); 10255682Smarkm return ret; 10355682Smarkm } 10455682Smarkm 10555682Smarkm buf_size = length_AP_REP(&ap); 10655682Smarkm buf = realloc(buf, buf_size); 10755682Smarkm if(buf == NULL) { 10855682Smarkm free_AP_REP (&ap); 10955682Smarkm return ENOMEM; 11055682Smarkm } 11155682Smarkm ret = encode_AP_REP (buf + buf_size - 1, buf_size, &ap, &len); 11255682Smarkm 11355682Smarkm free_AP_REP (&ap); 11455682Smarkm 11555682Smarkm if(len != buf_size) 11655682Smarkm krb5_abortx(context, "krb5_mk_rep: encoded length != calculated length"); 11755682Smarkm outbuf->data = buf; 11855682Smarkm outbuf->length = len; 11955682Smarkm return 0; 12055682Smarkm} 121