155682Smarkm/* 2178825Sdfr * Copyright (c) 1997 - 2003 Kungliga Tekniska H�gskolan 355682Smarkm * (Royal Institute of Technology, Stockholm, Sweden). 455682Smarkm * All rights reserved. 555682Smarkm * 655682Smarkm * Redistribution and use in source and binary forms, with or without 755682Smarkm * modification, are permitted provided that the following conditions 855682Smarkm * are met: 955682Smarkm * 1055682Smarkm * 1. Redistributions of source code must retain the above copyright 1155682Smarkm * notice, this list of conditions and the following disclaimer. 1255682Smarkm * 1355682Smarkm * 2. Redistributions in binary form must reproduce the above copyright 1455682Smarkm * notice, this list of conditions and the following disclaimer in the 1555682Smarkm * documentation and/or other materials provided with the distribution. 1655682Smarkm * 1755682Smarkm * 3. Neither the name of the Institute nor the names of its contributors 1855682Smarkm * may be used to endorse or promote products derived from this software 1955682Smarkm * without specific prior written permission. 2055682Smarkm * 2155682Smarkm * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 2255682Smarkm * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2355682Smarkm * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2455682Smarkm * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 2555682Smarkm * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2655682Smarkm * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2755682Smarkm * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2855682Smarkm * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2955682Smarkm * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3055682Smarkm * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3155682Smarkm * SUCH DAMAGE. 3255682Smarkm */ 3355682Smarkm 3455682Smarkm#include <krb5_locl.h> 3555682Smarkm 36178825SdfrRCSID("$Id: mk_safe.c 13863 2004-05-25 21:46:46Z lha $"); 3755682Smarkm 38178825Sdfrkrb5_error_code KRB5_LIB_FUNCTION 3955682Smarkmkrb5_mk_safe(krb5_context context, 4055682Smarkm krb5_auth_context auth_context, 4155682Smarkm const krb5_data *userdata, 4255682Smarkm krb5_data *outbuf, 43178825Sdfr krb5_replay_data *outdata) 4455682Smarkm{ 45178825Sdfr krb5_error_code ret; 46178825Sdfr KRB_SAFE s; 47178825Sdfr u_char *buf = NULL; 48178825Sdfr size_t buf_size; 49178825Sdfr size_t len; 50178825Sdfr krb5_crypto crypto; 51178825Sdfr krb5_keyblock *key; 52178825Sdfr krb5_replay_data rdata; 5355682Smarkm 54178825Sdfr if ((auth_context->flags & 55178825Sdfr (KRB5_AUTH_CONTEXT_RET_TIME | KRB5_AUTH_CONTEXT_RET_SEQUENCE)) && 56178825Sdfr outdata == NULL) 57178825Sdfr return KRB5_RC_REQUIRED; /* XXX better error, MIT returns this */ 5890926Snectar 59178825Sdfr if (auth_context->local_subkey) 60178825Sdfr key = auth_context->local_subkey; 61178825Sdfr else if (auth_context->remote_subkey) 62178825Sdfr key = auth_context->remote_subkey; 63178825Sdfr else 64178825Sdfr key = auth_context->keyblock; 6555682Smarkm 66178825Sdfr s.pvno = 5; 67178825Sdfr s.msg_type = krb_safe; 6855682Smarkm 69178825Sdfr memset(&rdata, 0, sizeof(rdata)); 7055682Smarkm 71178825Sdfr s.safe_body.user_data = *userdata; 7255682Smarkm 73178825Sdfr krb5_us_timeofday (context, &rdata.timestamp, &rdata.usec); 7455682Smarkm 75178825Sdfr if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) { 76178825Sdfr s.safe_body.timestamp = &rdata.timestamp; 77178825Sdfr s.safe_body.usec = &rdata.usec; 78178825Sdfr } else { 79178825Sdfr s.safe_body.timestamp = NULL; 80178825Sdfr s.safe_body.usec = NULL; 81178825Sdfr } 82178825Sdfr 83178825Sdfr if (auth_context->flags & KRB5_AUTH_CONTEXT_RET_TIME) { 84178825Sdfr outdata->timestamp = rdata.timestamp; 85178825Sdfr outdata->usec = rdata.usec; 86178825Sdfr } 8755682Smarkm 88178825Sdfr if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) { 89178825Sdfr rdata.seq = auth_context->local_seqnumber; 90178825Sdfr s.safe_body.seq_number = &rdata.seq; 91178825Sdfr } else 92178825Sdfr s.safe_body.seq_number = NULL; 9355682Smarkm 94178825Sdfr if (auth_context->flags & KRB5_AUTH_CONTEXT_RET_SEQUENCE) 95178825Sdfr outdata->seq = auth_context->local_seqnumber; 96178825Sdfr 97178825Sdfr s.safe_body.s_address = auth_context->local_address; 98178825Sdfr s.safe_body.r_address = auth_context->remote_address; 99178825Sdfr 100178825Sdfr s.cksum.cksumtype = 0; 101178825Sdfr s.cksum.checksum.data = NULL; 102178825Sdfr s.cksum.checksum.length = 0; 103178825Sdfr 104178825Sdfr ASN1_MALLOC_ENCODE(KRB_SAFE, buf, buf_size, &s, &len, ret); 105178825Sdfr if (ret) 106178825Sdfr return ret; 107178825Sdfr if(buf_size != len) 108178825Sdfr krb5_abortx(context, "internal error in ASN.1 encoder"); 109178825Sdfr ret = krb5_crypto_init(context, key, 0, &crypto); 110178825Sdfr if (ret) { 111178825Sdfr free (buf); 112178825Sdfr return ret; 113178825Sdfr } 114178825Sdfr ret = krb5_create_checksum(context, 115178825Sdfr crypto, 116178825Sdfr KRB5_KU_KRB_SAFE_CKSUM, 117178825Sdfr 0, 118178825Sdfr buf, 119178825Sdfr len, 120178825Sdfr &s.cksum); 121178825Sdfr krb5_crypto_destroy(context, crypto); 122178825Sdfr if (ret) { 123178825Sdfr free (buf); 124178825Sdfr return ret; 125178825Sdfr } 126178825Sdfr 127178825Sdfr free(buf); 128178825Sdfr ASN1_MALLOC_ENCODE(KRB_SAFE, buf, buf_size, &s, &len, ret); 129178825Sdfr free_Checksum (&s.cksum); 130178825Sdfr if(ret) 131178825Sdfr return ret; 132178825Sdfr if(buf_size != len) 133178825Sdfr krb5_abortx(context, "internal error in ASN.1 encoder"); 134178825Sdfr 135178825Sdfr outbuf->length = len; 136178825Sdfr outbuf->data = buf; 137178825Sdfr if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) 138178825Sdfr auth_context->local_seqnumber = 139178825Sdfr (auth_context->local_seqnumber + 1) & 0xFFFFFFFF; 140178825Sdfr return 0; 14155682Smarkm} 142