1/* $NetBSD: mk_priv.c,v 1.2 2017/01/28 21:31:49 christos Exp $ */ 2 3/* 4 * Copyright (c) 1997 - 2003 Kungliga Tekniska H��gskolan 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 38KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 39krb5_mk_priv(krb5_context context, 40 krb5_auth_context auth_context, 41 const krb5_data *userdata, 42 krb5_data *outbuf, 43 krb5_replay_data *outdata) 44{ 45 krb5_error_code ret; 46 KRB_PRIV s; 47 EncKrbPrivPart part; 48 u_char *buf = NULL; 49 size_t buf_size; 50 size_t len = 0; 51 krb5_crypto crypto; 52 krb5_keyblock *key; 53 krb5_replay_data rdata; 54 55 if ((auth_context->flags & 56 (KRB5_AUTH_CONTEXT_RET_TIME | KRB5_AUTH_CONTEXT_RET_SEQUENCE)) && 57 outdata == NULL) 58 return KRB5_RC_REQUIRED; /* XXX better error, MIT returns this */ 59 60 if (auth_context->local_subkey) 61 key = auth_context->local_subkey; 62 else if (auth_context->remote_subkey) 63 key = auth_context->remote_subkey; 64 else 65 key = auth_context->keyblock; 66 67 memset(&rdata, 0, sizeof(rdata)); 68 69 part.user_data = *userdata; 70 71 krb5_us_timeofday (context, &rdata.timestamp, &rdata.usec); 72 73 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) { 74 part.timestamp = &rdata.timestamp; 75 part.usec = &rdata.usec; 76 } else { 77 part.timestamp = NULL; 78 part.usec = NULL; 79 } 80 81 if (auth_context->flags & KRB5_AUTH_CONTEXT_RET_TIME) { 82 outdata->timestamp = rdata.timestamp; 83 outdata->usec = rdata.usec; 84 } 85 86 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) { 87 rdata.seq = auth_context->local_seqnumber; 88 part.seq_number = &rdata.seq; 89 } else 90 part.seq_number = NULL; 91 92 if (auth_context->flags & KRB5_AUTH_CONTEXT_RET_SEQUENCE) 93 outdata->seq = auth_context->local_seqnumber; 94 95 part.s_address = auth_context->local_address; 96 part.r_address = auth_context->remote_address; 97 98 krb5_data_zero (&s.enc_part.cipher); 99 100 ASN1_MALLOC_ENCODE(EncKrbPrivPart, buf, buf_size, &part, &len, ret); 101 if (ret) 102 goto fail; 103 if (buf_size != len) 104 krb5_abortx(context, "internal error in ASN.1 encoder"); 105 106 s.pvno = 5; 107 s.msg_type = krb_priv; 108 s.enc_part.etype = key->keytype; 109 s.enc_part.kvno = NULL; 110 111 ret = krb5_crypto_init(context, key, 0, &crypto); 112 if (ret) { 113 free (buf); 114 return ret; 115 } 116 ret = krb5_encrypt (context, 117 crypto, 118 KRB5_KU_KRB_PRIV, 119 buf + buf_size - len, 120 len, 121 &s.enc_part.cipher); 122 krb5_crypto_destroy(context, crypto); 123 if (ret) { 124 free(buf); 125 return ret; 126 } 127 free(buf); 128 129 130 ASN1_MALLOC_ENCODE(KRB_PRIV, buf, buf_size, &s, &len, ret); 131 if (ret) 132 goto fail; 133 if (buf_size != len) 134 krb5_abortx(context, "internal error in ASN.1 encoder"); 135 136 krb5_data_free (&s.enc_part.cipher); 137 138 ret = krb5_data_copy(outbuf, buf + buf_size - len, len); 139 if (ret) { 140 free(buf); 141 return krb5_enomem(context); 142 } 143 free (buf); 144 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) 145 auth_context->local_seqnumber = 146 (auth_context->local_seqnumber + 1) & 0xFFFFFFFF; 147 return 0; 148 149 fail: 150 free (buf); 151 krb5_data_free (&s.enc_part.cipher); 152 return ret; 153} 154