1 /* 2 * Copyright (c) 1997 - 2003 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 13863 2004-05-25 21:46:46Z lha $"); 37 38 krb5_error_code KRB5_LIB_FUNCTION 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 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 krb5_set_error_string (context, 65 "krb5_mk_rep: generating subkey"); 66 free_EncAPRepPart(&body); 67 return ret; 68 } 69 } 70 ret = krb5_copy_keyblock(context, auth_context->local_subkey, 71 &body.subkey); 72 if (ret) { 73 krb5_set_error_string (context, 74 "krb5_copy_keyblock: out of memory"); 75 free_EncAPRepPart(&body); 76 return ENOMEM; 77 } 78 } else 79 body.subkey = NULL; 80 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) { 81 if(auth_context->local_seqnumber == 0) 82 krb5_generate_seq_number (context, 83 auth_context->keyblock, 84 &auth_context->local_seqnumber); 85 ALLOC(body.seq_number, 1); 86 if (body.seq_number == NULL) { 87 krb5_set_error_string (context, "malloc: out of memory"); 88 free_EncAPRepPart(&body); 89 return ENOMEM; 90 } 91 *(body.seq_number) = auth_context->local_seqnumber; 92 } else 93 body.seq_number = NULL; 94 95 ap.enc_part.etype = auth_context->keyblock->keytype; 96 ap.enc_part.kvno = NULL; 97 98 ASN1_MALLOC_ENCODE(EncAPRepPart, buf, buf_size, &body, &len, ret); 99 free_EncAPRepPart (&body); 100 if(ret) 101 return ret; 102 if (buf_size != len) 103 krb5_abortx(context, "internal error in ASN.1 encoder"); 104 ret = krb5_crypto_init(context, auth_context->keyblock, 105 0 /* ap.enc_part.etype */, &crypto); 106 if (ret) { 107 free (buf); 108 return ret; 109 } 110 ret = krb5_encrypt (context, 111 crypto, 112 KRB5_KU_AP_REQ_ENC_PART, 113 buf + buf_size - len, 114 len, 115 &ap.enc_part.cipher); 116 krb5_crypto_destroy(context, crypto); 117 free(buf); 118 if (ret) 119 return ret; 120 121 ASN1_MALLOC_ENCODE(AP_REP, outbuf->data, outbuf->length, &ap, &len, ret); 122 if (ret == 0 && outbuf->length != len) 123 krb5_abortx(context, "internal error in ASN.1 encoder"); 124 free_AP_REP (&ap); 125 return ret; 126 } 127