1 /* 2 * Copyright (c) 1997 - 2003 Kungliga Tekniska Högskolan 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 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 37 krb5_mk_rep(krb5_context context, 38 krb5_auth_context auth_context, 39 krb5_data *outbuf) 40 { 41 krb5_error_code ret; 42 AP_REP ap; 43 EncAPRepPart body; 44 u_char *buf = NULL; 45 size_t buf_size; 46 size_t len = 0; 47 krb5_crypto crypto; 48 49 ap.pvno = 5; 50 ap.msg_type = krb_ap_rep; 51 52 memset (&body, 0, sizeof(body)); 53 54 body.ctime = auth_context->authenticator->ctime; 55 body.cusec = auth_context->authenticator->cusec; 56 if (auth_context->flags & KRB5_AUTH_CONTEXT_USE_SUBKEY) { 57 if (auth_context->local_subkey == NULL) { 58 ret = krb5_auth_con_generatelocalsubkey(context, 59 auth_context, 60 auth_context->keyblock); 61 if(ret) { 62 free_EncAPRepPart(&body); 63 return ret; 64 } 65 } 66 ret = krb5_copy_keyblock(context, auth_context->local_subkey, 67 &body.subkey); 68 if (ret) { 69 free_EncAPRepPart(&body); 70 krb5_set_error_message(context, ENOMEM, 71 N_("malloc: out of memory", "")); 72 return ENOMEM; 73 } 74 } else 75 body.subkey = NULL; 76 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) { 77 if(auth_context->local_seqnumber == 0) 78 krb5_generate_seq_number (context, 79 auth_context->keyblock, 80 &auth_context->local_seqnumber); 81 ALLOC(body.seq_number, 1); 82 if (body.seq_number == NULL) { 83 krb5_set_error_message(context, ENOMEM, "malloc: out of memory"); 84 free_EncAPRepPart(&body); 85 return ENOMEM; 86 } 87 *(body.seq_number) = auth_context->local_seqnumber; 88 } else 89 body.seq_number = NULL; 90 91 ap.enc_part.etype = auth_context->keyblock->keytype; 92 ap.enc_part.kvno = NULL; 93 94 ASN1_MALLOC_ENCODE(EncAPRepPart, buf, buf_size, &body, &len, ret); 95 free_EncAPRepPart (&body); 96 if(ret) 97 return ret; 98 if (buf_size != len) 99 krb5_abortx(context, "internal error in ASN.1 encoder"); 100 ret = krb5_crypto_init(context, auth_context->keyblock, 101 0 /* ap.enc_part.etype */, &crypto); 102 if (ret) { 103 free (buf); 104 return ret; 105 } 106 ret = krb5_encrypt (context, 107 crypto, 108 KRB5_KU_AP_REQ_ENC_PART, 109 buf + buf_size - len, 110 len, 111 &ap.enc_part.cipher); 112 krb5_crypto_destroy(context, crypto); 113 free(buf); 114 if (ret) 115 return ret; 116 117 ASN1_MALLOC_ENCODE(AP_REP, outbuf->data, outbuf->length, &ap, &len, ret); 118 if (ret == 0 && outbuf->length != len) 119 krb5_abortx(context, "internal error in ASN.1 encoder"); 120 free_AP_REP (&ap); 121 return ret; 122 } 123