1 /* 2 * Copyright (c) 1997 - 2002 Kungliga Tekniska H�gskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <krb5_locl.h> 35 36 RCSID("$Id: mk_rep.c,v 1.20 2002/09/04 16:26:05 joda Exp $"); 37 38 krb5_error_code 39 krb5_mk_rep(krb5_context context, 40 krb5_auth_context auth_context, 41 krb5_data *outbuf) 42 { 43 krb5_error_code ret; 44 AP_REP ap; 45 EncAPRepPart body; 46 u_char *buf = NULL; 47 size_t buf_size; 48 size_t len; 49 krb5_crypto crypto; 50 51 ap.pvno = 5; 52 ap.msg_type = krb_ap_rep; 53 54 memset (&body, 0, sizeof(body)); 55 56 body.ctime = auth_context->authenticator->ctime; 57 body.cusec = auth_context->authenticator->cusec; 58 body.subkey = NULL; 59 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) { 60 krb5_generate_seq_number (context, 61 auth_context->keyblock, 62 &auth_context->local_seqnumber); 63 body.seq_number = malloc (sizeof(*body.seq_number)); 64 if (body.seq_number == NULL) { 65 krb5_set_error_string (context, "malloc: out of memory"); 66 return ENOMEM; 67 } 68 *(body.seq_number) = auth_context->local_seqnumber; 69 } else 70 body.seq_number = NULL; 71 72 ap.enc_part.etype = auth_context->keyblock->keytype; 73 ap.enc_part.kvno = NULL; 74 75 ASN1_MALLOC_ENCODE(EncAPRepPart, buf, buf_size, &body, &len, ret); 76 free_EncAPRepPart (&body); 77 if(ret) 78 return ret; 79 ret = krb5_crypto_init(context, auth_context->keyblock, 80 0 /* ap.enc_part.etype */, &crypto); 81 if (ret) { 82 free (buf); 83 return ret; 84 } 85 ret = krb5_encrypt (context, 86 crypto, 87 KRB5_KU_AP_REQ_ENC_PART, 88 buf + buf_size - len, 89 len, 90 &ap.enc_part.cipher); 91 krb5_crypto_destroy(context, crypto); 92 if (ret) { 93 free(buf); 94 return ret; 95 } 96 97 ASN1_MALLOC_ENCODE(AP_REP, outbuf->data, outbuf->length, &ap, &len, ret); 98 free_AP_REP (&ap); 99 return ret; 100 } 101