155682Smarkm/* 2233294Sstas * Copyright (c) 1997 - 2003 Kungliga Tekniska H��gskolan 3233294Sstas * (Royal Institute of Technology, Stockholm, Sweden). 4233294Sstas * All rights reserved. 555682Smarkm * 6233294Sstas * Redistribution and use in source and binary forms, with or without 7233294Sstas * modification, are permitted provided that the following conditions 8233294Sstas * are met: 955682Smarkm * 10233294Sstas * 1. Redistributions of source code must retain the above copyright 11233294Sstas * notice, this list of conditions and the following disclaimer. 1255682Smarkm * 13233294Sstas * 2. Redistributions in binary form must reproduce the above copyright 14233294Sstas * notice, this list of conditions and the following disclaimer in the 15233294Sstas * documentation and/or other materials provided with the distribution. 1655682Smarkm * 17233294Sstas * 3. Neither the name of the Institute nor the names of its contributors 18233294Sstas * may be used to endorse or promote products derived from this software 19233294Sstas * without specific prior written permission. 2055682Smarkm * 21233294Sstas * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22233294Sstas * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23233294Sstas * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24233294Sstas * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25233294Sstas * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26233294Sstas * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27233294Sstas * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28233294Sstas * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29233294Sstas * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30233294Sstas * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31233294Sstas * SUCH DAMAGE. 3255682Smarkm */ 3355682Smarkm 34233294Sstas#include "krb5_locl.h" 3555682Smarkm 36233294SstasKRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 3755682Smarkmkrb5_mk_safe(krb5_context context, 3855682Smarkm krb5_auth_context auth_context, 3955682Smarkm const krb5_data *userdata, 4055682Smarkm krb5_data *outbuf, 41178825Sdfr krb5_replay_data *outdata) 4255682Smarkm{ 43178825Sdfr krb5_error_code ret; 44178825Sdfr KRB_SAFE s; 45178825Sdfr u_char *buf = NULL; 46178825Sdfr size_t buf_size; 47233294Sstas size_t len = 0; 48178825Sdfr krb5_crypto crypto; 49178825Sdfr krb5_keyblock *key; 50178825Sdfr krb5_replay_data rdata; 5155682Smarkm 52233294Sstas if ((auth_context->flags & 53178825Sdfr (KRB5_AUTH_CONTEXT_RET_TIME | KRB5_AUTH_CONTEXT_RET_SEQUENCE)) && 54178825Sdfr outdata == NULL) 55178825Sdfr return KRB5_RC_REQUIRED; /* XXX better error, MIT returns this */ 5690926Snectar 57178825Sdfr if (auth_context->local_subkey) 58178825Sdfr key = auth_context->local_subkey; 59178825Sdfr else if (auth_context->remote_subkey) 60178825Sdfr key = auth_context->remote_subkey; 61178825Sdfr else 62178825Sdfr key = auth_context->keyblock; 6355682Smarkm 64178825Sdfr s.pvno = 5; 65178825Sdfr s.msg_type = krb_safe; 6655682Smarkm 67178825Sdfr memset(&rdata, 0, sizeof(rdata)); 6855682Smarkm 69178825Sdfr s.safe_body.user_data = *userdata; 7055682Smarkm 71178825Sdfr krb5_us_timeofday (context, &rdata.timestamp, &rdata.usec); 7255682Smarkm 73178825Sdfr if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) { 74178825Sdfr s.safe_body.timestamp = &rdata.timestamp; 75178825Sdfr s.safe_body.usec = &rdata.usec; 76178825Sdfr } else { 77178825Sdfr s.safe_body.timestamp = NULL; 78178825Sdfr s.safe_body.usec = NULL; 79178825Sdfr } 80233294Sstas 81178825Sdfr if (auth_context->flags & KRB5_AUTH_CONTEXT_RET_TIME) { 82178825Sdfr outdata->timestamp = rdata.timestamp; 83178825Sdfr outdata->usec = rdata.usec; 84178825Sdfr } 8555682Smarkm 86178825Sdfr if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) { 87178825Sdfr rdata.seq = auth_context->local_seqnumber; 88178825Sdfr s.safe_body.seq_number = &rdata.seq; 89233294Sstas } else 90178825Sdfr s.safe_body.seq_number = NULL; 9155682Smarkm 92178825Sdfr if (auth_context->flags & KRB5_AUTH_CONTEXT_RET_SEQUENCE) 93178825Sdfr outdata->seq = auth_context->local_seqnumber; 94233294Sstas 95178825Sdfr s.safe_body.s_address = auth_context->local_address; 96178825Sdfr s.safe_body.r_address = auth_context->remote_address; 97178825Sdfr 98178825Sdfr s.cksum.cksumtype = 0; 99178825Sdfr s.cksum.checksum.data = NULL; 100178825Sdfr s.cksum.checksum.length = 0; 101178825Sdfr 102178825Sdfr ASN1_MALLOC_ENCODE(KRB_SAFE, buf, buf_size, &s, &len, ret); 103178825Sdfr if (ret) 104178825Sdfr return ret; 105178825Sdfr if(buf_size != len) 106178825Sdfr krb5_abortx(context, "internal error in ASN.1 encoder"); 107178825Sdfr ret = krb5_crypto_init(context, key, 0, &crypto); 108178825Sdfr if (ret) { 109178825Sdfr free (buf); 110178825Sdfr return ret; 111178825Sdfr } 112233294Sstas ret = krb5_create_checksum(context, 113178825Sdfr crypto, 114178825Sdfr KRB5_KU_KRB_SAFE_CKSUM, 115178825Sdfr 0, 116178825Sdfr buf, 117178825Sdfr len, 118178825Sdfr &s.cksum); 119178825Sdfr krb5_crypto_destroy(context, crypto); 120178825Sdfr if (ret) { 121178825Sdfr free (buf); 122178825Sdfr return ret; 123178825Sdfr } 124178825Sdfr 125178825Sdfr free(buf); 126178825Sdfr ASN1_MALLOC_ENCODE(KRB_SAFE, buf, buf_size, &s, &len, ret); 127178825Sdfr free_Checksum (&s.cksum); 128178825Sdfr if(ret) 129178825Sdfr return ret; 130178825Sdfr if(buf_size != len) 131178825Sdfr krb5_abortx(context, "internal error in ASN.1 encoder"); 132178825Sdfr 133178825Sdfr outbuf->length = len; 134178825Sdfr outbuf->data = buf; 135178825Sdfr if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) 136178825Sdfr auth_context->local_seqnumber = 137178825Sdfr (auth_context->local_seqnumber + 1) & 0xFFFFFFFF; 138178825Sdfr return 0; 13955682Smarkm} 140