121 lines
4.0 KiB
C
121 lines
4.0 KiB
C
/*
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* Copyright (c) 1995, 1996, 1997, 1998 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 "krb_locl.h"
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RCSID("$Id: mk_priv.c,v 1.22 1999/12/02 16:58:43 joda Exp $");
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/* application include files */
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#include "krb-archaeology.h"
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/*
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* krb_mk_priv() constructs an AUTH_MSG_PRIVATE message. It takes
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* some user data "in" of "length" bytes and creates a packet in "out"
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* consisting of the user data, a timestamp, and the sender's network
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* address.
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* The packet is encrypted by pcbc_encrypt(), using the given
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* "key" and "schedule".
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* The length of the resulting packet "out" is
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* returned.
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*
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* It is similar to krb_mk_safe() except for the additional key
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* schedule argument "schedule" and the fact that the data is encrypted
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* rather than appended with a checksum. The protocol version is
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* KRB_PROT_VERSION, defined in "krb.h".
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*
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* The "out" packet consists of:
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*
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* Size Variable Field
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* ---- -------- -----
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*
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* 1 byte KRB_PROT_VERSION protocol version number
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* 1 byte AUTH_MSG_PRIVATE | message type plus local
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* HOST_BYTE_ORDER byte order in low bit
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*
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* 4 bytes c_length length of data
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* we encrypt from here with pcbc_encrypt
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*
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* 4 bytes length length of user data
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* length in user data
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* 1 byte msg_time_5ms timestamp milliseconds
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* 4 bytes sender->sin.addr.s_addr sender's IP address
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*
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* 4 bytes msg_time_sec or timestamp seconds with
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* -msg_time_sec direction in sign bit
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*
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* 0<=n<=7 bytes pad to 8 byte multiple zeroes
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*/
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int32_t
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krb_mk_priv(void *in, void *out, u_int32_t length,
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struct des_ks_struct *schedule, des_cblock *key,
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struct sockaddr_in *sender, struct sockaddr_in *receiver)
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{
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unsigned char *p = (unsigned char*)out;
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unsigned char *cipher;
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struct timeval tv;
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u_int32_t src_addr;
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u_int32_t len;
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p += krb_put_int(KRB_PROT_VERSION, p, 1, 1);
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p += krb_put_int(AUTH_MSG_PRIVATE, p, 1, 1);
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len = 4 + length + 1 + 4 + 4;
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len = (len + 7) & ~7;
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p += krb_put_int(len, p, 4, 4);
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cipher = p;
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p += krb_put_int(length, p, 4, 4);
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memcpy(p, in, length);
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p += length;
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krb_kdctimeofday(&tv);
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*p++ =tv.tv_usec / 5000;
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src_addr = sender->sin_addr.s_addr;
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p += krb_put_address(src_addr, p, 4);
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p += krb_put_int(lsb_time(tv.tv_sec, sender, receiver), p, 4, 4);
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memset(p, 0, 7);
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des_pcbc_encrypt((des_cblock *)cipher, (des_cblock *)cipher,
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len, schedule, key, DES_ENCRYPT);
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return (cipher - (unsigned char*)out) + len;
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}
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