135 lines
4.1 KiB
C
135 lines
4.1 KiB
C
/*
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* Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <krb5_locl.h>
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RCSID("$Id: mk_safe.c,v 1.26 2001/05/14 06:14:50 assar Exp $");
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krb5_error_code
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krb5_mk_safe(krb5_context context,
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krb5_auth_context auth_context,
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const krb5_data *userdata,
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krb5_data *outbuf,
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/*krb5_replay_data*/ void *outdata)
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{
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krb5_error_code ret;
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KRB_SAFE s;
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int32_t sec, usec;
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KerberosTime sec2;
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int usec2;
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u_char *buf = NULL;
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void *tmp;
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size_t buf_size;
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size_t len;
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u_int32_t tmp_seq;
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krb5_crypto crypto;
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s.pvno = 5;
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s.msg_type = krb_safe;
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s.safe_body.user_data = *userdata;
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krb5_us_timeofday (context, &sec, &usec);
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sec2 = sec;
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s.safe_body.timestamp = &sec2;
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usec2 = usec2;
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s.safe_body.usec = &usec2;
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if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) {
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tmp_seq = auth_context->local_seqnumber;
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s.safe_body.seq_number = &tmp_seq;
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} else
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s.safe_body.seq_number = NULL;
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s.safe_body.s_address = auth_context->local_address;
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s.safe_body.r_address = auth_context->remote_address;
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s.cksum.cksumtype = 0;
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s.cksum.checksum.data = NULL;
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s.cksum.checksum.length = 0;
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buf_size = length_KRB_SAFE(&s);
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buf = malloc(buf_size + 128); /* add some for checksum */
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if(buf == NULL) {
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krb5_set_error_string (context, "malloc: out of memory");
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return ENOMEM;
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}
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ret = encode_KRB_SAFE (buf + buf_size - 1, buf_size, &s, &len);
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if (ret) {
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free (buf);
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return ret;
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}
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ret = krb5_crypto_init(context, auth_context->keyblock, 0, &crypto);
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if (ret) {
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free (buf);
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return ret;
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}
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ret = krb5_create_checksum(context,
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crypto,
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KRB5_KU_KRB_SAFE_CKSUM,
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0,
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buf + buf_size - len,
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len,
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&s.cksum);
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krb5_crypto_destroy(context, crypto);
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if (ret) {
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free (buf);
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return ret;
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}
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buf_size = length_KRB_SAFE(&s);
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tmp = realloc(buf, buf_size);
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if(tmp == NULL) {
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free(buf);
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krb5_set_error_string (context, "malloc: out of memory");
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return ENOMEM;
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}
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buf = tmp;
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ret = encode_KRB_SAFE (buf + buf_size - 1, buf_size, &s, &len);
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free_Checksum (&s.cksum);
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outbuf->length = len;
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outbuf->data = malloc (len);
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if (outbuf->data == NULL) {
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free (buf);
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krb5_set_error_string (context, "malloc: out of memory");
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return ENOMEM;
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}
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memcpy (outbuf->data, buf + buf_size - len, len);
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free (buf);
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if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE)
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auth_context->local_seqnumber =
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(auth_context->local_seqnumber + 1) & 0xFFFFFFFF;
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return 0;
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}
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