60643d379b
(Including all changes for FreeBSD - importing the original eBones distribution would be too complex at this stage, since I don't have access to Piero's CVS.) (If you want to include eBones in your system, don't forget to include MAKE_EBONES in /etc/make.conf.) (This stuff is now also suppable from braae.ru.ac.za.) Bones originally from MIT SIPB. Original port to FreeBSD 1.x by Piero Serini. Moved to FreeBSD 2.0 by Doug Rabson and Geoff Rehmet. Nice bug fixes from Doug Rabson.
169 lines
4.8 KiB
C
169 lines
4.8 KiB
C
/*
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* Copyright 1986, 1987, 1988 by the Massachusetts Institute
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* of Technology.
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* For copying and distribution information, please see the file
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* <Copyright.MIT>.
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*
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* This routine constructs a Kerberos 'safe msg', i.e. authenticated
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* using a private session key to seed a checksum. Msg is NOT
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* encrypted.
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*
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* Note-- bcopy is used to avoid alignment problems on IBM RT
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*
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* Returns either <0 ===> error, or resulting size of message
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*
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* Steve Miller Project Athena MIT/DEC
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*
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* from: mk_safe.c,v 4.12 89/03/22 14:50:49 jtkohl Exp $
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* $Id: mk_safe.c,v 1.2 1994/07/19 19:25:59 g89r4222 Exp $
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*/
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#ifndef lint
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static char rcsid[] =
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"$Id: mk_safe.c,v 1.2 1994/07/19 19:25:59 g89r4222 Exp $";
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#endif /* lint */
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/* system include files */
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#include <stdio.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <sys/time.h>
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/* application include files */
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#include <des.h>
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#include <krb.h>
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#include <prot.h>
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#include "lsb_addr_comp.h"
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extern char *errmsg();
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extern int errno;
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extern int krb_debug;
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/* static storage */
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static u_long cksum;
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static C_Block big_cksum[2];
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static struct timeval msg_time;
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static u_char msg_time_5ms;
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static long msg_time_sec;
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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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long krb_mk_safe(in,out,length,key,sender,receiver)
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u_char *in; /* application data */
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u_char *out; /*
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* put msg here, leave room for header!
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* breaks if in and out (header stuff)
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* overlap
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*/
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u_long length; /* of in data */
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C_Block *key; /* encryption key for seed and ivec */
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struct sockaddr_in *sender; /* sender address */
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struct sockaddr_in *receiver; /* receiver address */
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{
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register u_char *p,*q;
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/*
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* get the current time to use instead of a sequence #, since
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* process lifetime may be shorter than the lifetime of a session
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* key.
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*/
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if (gettimeofday(&msg_time,(struct timezone *)0)) {
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return -1;
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}
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msg_time_sec = (long) msg_time.tv_sec;
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msg_time_5ms = msg_time.tv_usec/5000; /* 5ms quanta */
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p = out;
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*p++ = KRB_PROT_VERSION;
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*p++ = AUTH_MSG_SAFE | HOST_BYTE_ORDER;
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q = p; /* start for checksum stuff */
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/* stuff input length */
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bcopy((char *)&length,(char *)p,sizeof(length));
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p += sizeof(length);
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/* make all the stuff contiguous for checksum */
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bcopy((char *)in,(char *)p,(int) length);
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p += length;
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/* stuff time 5ms */
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bcopy((char *)&msg_time_5ms,(char *)p,sizeof(msg_time_5ms));
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p += sizeof(msg_time_5ms);
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/* stuff source address */
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bcopy((char *) &sender->sin_addr.s_addr,(char *)p,
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sizeof(sender->sin_addr.s_addr));
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p += sizeof(sender->sin_addr.s_addr);
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/*
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* direction bit is the sign bit of the timestamp. Ok until
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* 2038??
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*/
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/* For compatibility with broken old code, compares are done in VAX
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byte order (LSBFIRST) */
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if (lsb_net_ulong_less(sender->sin_addr.s_addr, /* src < recv */
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receiver->sin_addr.s_addr)==-1)
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msg_time_sec = -msg_time_sec;
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else if (lsb_net_ulong_less(sender->sin_addr.s_addr,
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receiver->sin_addr.s_addr)==0)
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if (lsb_net_ushort_less(sender->sin_port,receiver->sin_port) == -1)
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msg_time_sec = -msg_time_sec;
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/*
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* all that for one tiny bit! Heaven help those that talk to
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* themselves.
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*/
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/* stuff time sec */
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bcopy((char *)&msg_time_sec,(char *)p,sizeof(msg_time_sec));
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p += sizeof(msg_time_sec);
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#ifdef NOENCRYPTION
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cksum = 0;
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bzero(big_cksum, sizeof(big_cksum));
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#else
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cksum=quad_cksum(q,big_cksum,p-q,2,key);
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#endif
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if (krb_debug)
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printf("\ncksum = %u",cksum);
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/* stuff checksum */
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bcopy((char *)big_cksum,(char *)p,sizeof(big_cksum));
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p += sizeof(big_cksum);
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return ((long)(p - out)); /* resulting size */
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}
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