1 /* $NetBSD: mk_rep.c,v 1.1.1.2 2014/04/24 12:45:50 pettai Exp $ */ 2 3 /* 4 * Copyright (c) 1997 - 2003 Kungliga Tekniska Högskolan 5 * (Royal Institute of Technology, Stockholm, Sweden). 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * 3. Neither the name of the Institute nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include "krb5_locl.h" 37 38 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 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 = 0; 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 if (auth_context->flags & KRB5_AUTH_CONTEXT_USE_SUBKEY) { 59 if (auth_context->local_subkey == NULL) { 60 ret = krb5_auth_con_generatelocalsubkey(context, 61 auth_context, 62 auth_context->keyblock); 63 if(ret) { 64 free_EncAPRepPart(&body); 65 return ret; 66 } 67 } 68 ret = krb5_copy_keyblock(context, auth_context->local_subkey, 69 &body.subkey); 70 if (ret) { 71 free_EncAPRepPart(&body); 72 krb5_set_error_message(context, ENOMEM, 73 N_("malloc: out of memory", "")); 74 return ENOMEM; 75 } 76 } else 77 body.subkey = NULL; 78 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) { 79 if(auth_context->local_seqnumber == 0) 80 krb5_generate_seq_number (context, 81 auth_context->keyblock, 82 &auth_context->local_seqnumber); 83 ALLOC(body.seq_number, 1); 84 if (body.seq_number == NULL) { 85 krb5_set_error_message(context, ENOMEM, "malloc: out of memory"); 86 free_EncAPRepPart(&body); 87 return ENOMEM; 88 } 89 *(body.seq_number) = auth_context->local_seqnumber; 90 } else 91 body.seq_number = NULL; 92 93 ap.enc_part.etype = auth_context->keyblock->keytype; 94 ap.enc_part.kvno = NULL; 95 96 ASN1_MALLOC_ENCODE(EncAPRepPart, buf, buf_size, &body, &len, ret); 97 free_EncAPRepPart (&body); 98 if(ret) 99 return ret; 100 if (buf_size != len) 101 krb5_abortx(context, "internal error in ASN.1 encoder"); 102 ret = krb5_crypto_init(context, auth_context->keyblock, 103 0 /* ap.enc_part.etype */, &crypto); 104 if (ret) { 105 free (buf); 106 return ret; 107 } 108 ret = krb5_encrypt (context, 109 crypto, 110 KRB5_KU_AP_REQ_ENC_PART, 111 buf + buf_size - len, 112 len, 113 &ap.enc_part.cipher); 114 krb5_crypto_destroy(context, crypto); 115 free(buf); 116 if (ret) 117 return ret; 118 119 ASN1_MALLOC_ENCODE(AP_REP, outbuf->data, outbuf->length, &ap, &len, ret); 120 if (ret == 0 && outbuf->length != len) 121 krb5_abortx(context, "internal error in ASN.1 encoder"); 122 free_AP_REP (&ap); 123 return ret; 124 } 125