132 lines
4.5 KiB
C
132 lines
4.5 KiB
C
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/*
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* Copyright (c) 1995, 1996, 1997 Kungliga Tekniska H<EFBFBD>gskolan
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the Kungliga Tekniska
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* H<EFBFBD>gskolan and its contributors.
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*
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* 4. 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_safe.c,v 1.21 1997/04/19 23:18:03 joda Exp $");
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/* application include files */
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#include "lsb_addr_comp.h"
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/* from rd_safe.c */
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extern int dqc_type;
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void fixup_quad_cksum(void*, size_t, des_cblock*, void*, void*, int);
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/*
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* krb_mk_safe() constructs an AUTH_MSG_SAFE message. It takes some
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* 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, followed by a checksum computed on the above, using the
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* given "key". The length of the resulting packet is returned.
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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_SAFE | message type plus local
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* HOST_BYTE_ORDER byte order in low bit
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*
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* ===================== begin checksum ================================
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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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* ======================= end checksum ================================
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*
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* 16 bytes big_cksum quadratic checksum of
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* above using "key"
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*/
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int32_t
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krb_mk_safe(void *in, void *out, u_int32_t length, 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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struct timeval tv;
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unsigned char *start;
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u_int32_t src_addr;
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p += krb_put_int(KRB_PROT_VERSION, p, 1);
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p += krb_put_int(AUTH_MSG_SAFE, p, 1);
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start = p;
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p += krb_put_int(length, p, 4);
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memcpy(p, in, length);
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p += length;
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gettimeofday(&tv, NULL);
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*p++ = tv.tv_usec/5000; /* 5ms */
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src_addr = sender->sin_addr.s_addr;
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p += krb_put_address(src_addr, p);
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p += krb_put_int(lsb_time(tv.tv_sec, sender, receiver), p, 4);
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{
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/* We are faking big endian mode, so we need to fix the
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* checksum (that is byte order dependent). We always send a
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* checksum of the new type, unless we know that we are
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* talking to an old client (this requires a call to
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* krb_rd_safe first).
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*/
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unsigned char new_checksum[16];
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unsigned char old_checksum[16];
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fixup_quad_cksum(start, p - start, key, new_checksum, old_checksum, 0);
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if((dqc_type == DES_QUAD_GUESS && DES_QUAD_DEFAULT == DES_QUAD_OLD) ||
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dqc_type == DES_QUAD_OLD)
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memcpy(p, old_checksum, 16);
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else
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memcpy(p, new_checksum, 16);
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}
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p += 16;
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return p - (unsigned char*)out;
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}
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