1 /* 2 * Copyright (c) 1997 - 2000 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 1.18 2000/12/06 20:57:23 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 return ENOMEM; 66 *(body.seq_number) = auth_context->local_seqnumber; 67 } else 68 body.seq_number = NULL; 69 70 ap.enc_part.etype = auth_context->keyblock->keytype; 71 ap.enc_part.kvno = NULL; 72 73 buf_size = length_EncAPRepPart(&body); 74 buf = malloc (buf_size); 75 if (buf == NULL) { 76 free_EncAPRepPart (&body); 77 return ENOMEM; 78 } 79 80 ret = krb5_encode_EncAPRepPart (context, 81 buf + buf_size - 1, 82 buf_size, 83 &body, 84 &len); 85 86 free_EncAPRepPart (&body); 87 ret = krb5_crypto_init(context, auth_context->keyblock, 88 0 /* ap.enc_part.etype */, &crypto); 89 if (ret) { 90 free (buf); 91 return ret; 92 } 93 ret = krb5_encrypt (context, 94 crypto, 95 KRB5_KU_AP_REQ_ENC_PART, 96 buf + buf_size - len, 97 len, 98 &ap.enc_part.cipher); 99 krb5_crypto_destroy(context, crypto); 100 if (ret) { 101 free(buf); 102 return ret; 103 } 104 105 buf_size = length_AP_REP(&ap); 106 buf = realloc(buf, buf_size); 107 if(buf == NULL) { 108 free_AP_REP (&ap); 109 return ENOMEM; 110 } 111 ret = encode_AP_REP (buf + buf_size - 1, buf_size, &ap, &len); 112 113 free_AP_REP (&ap); 114 115 if(len != buf_size) 116 krb5_abortx(context, "krb5_mk_rep: encoded length != calculated length"); 117 outbuf->data = buf; 118 outbuf->length = len; 119 return 0; 120 } 121