diff options
Diffstat (limited to 'eBones/krb/rd_safe.c')
| -rw-r--r-- | eBones/krb/rd_safe.c | 183 |
1 files changed, 0 insertions, 183 deletions
diff --git a/eBones/krb/rd_safe.c b/eBones/krb/rd_safe.c deleted file mode 100644 index 4d3e8d6..0000000 --- a/eBones/krb/rd_safe.c +++ /dev/null @@ -1,183 +0,0 @@ -/* - * Copyright 1986, 1987, 1988 by the Massachusetts Institute - * of Technology. - * For copying and distribution information, please see the file - * <Copyright.MIT>. - * - * This routine dissects a a Kerberos 'safe msg', checking its - * integrity, and returning a pointer to the application data - * contained and its length. - * - * Returns 0 (RD_AP_OK) for success or an error code (RD_AP_...) - * - * Steve Miller Project Athena MIT/DEC - * - * from: rd_safe.c,v 4.12 89/01/23 15:16:16 steiner Exp $ - * $Id: rd_safe.c,v 1.3 1995/07/18 16:39:34 mark Exp $ - */ - -#if 0 -#ifndef lint -static char rcsid[] = -"$Id: rd_safe.c,v 1.3 1995/07/18 16:39:34 mark Exp $"; -#endif /* lint */ -#endif - -/* system include files */ -#include <stdio.h> -#include <string.h> -#include <errno.h> -#include <sys/types.h> -#include <netinet/in.h> -#include <sys/time.h> - -/* application include files */ -#include <des.h> -#include <krb.h> -#include <prot.h> -#include "lsb_addr_comp.h" - -extern char *errmsg(); -extern int errno; -extern int krb_debug; - -/* static storage */ - -static C_Block calc_cksum[2]; -static C_Block big_cksum[2]; -static int swap_bytes; -static struct timeval local_time; -static u_long delta_t; - -/* - * krb_rd_safe() checks the integrity of an AUTH_MSG_SAFE message. - * Given the message received, "in", the length of that message, - * "in_length", the "key" to compute the checksum with, and the - * network addresses of the "sender" and "receiver" of the message, - * krb_rd_safe() returns RD_AP_OK if message is okay, otherwise - * some error code. - * - * The message data retrieved from "in" is returned in the structure - * "m_data". The pointer to the application data (m_data->app_data) - * refers back to the appropriate place in "in". - * - * See the file "mk_safe.c" for the format of the AUTH_MSG_SAFE - * message. The structure containing the extracted message - * information, MSG_DAT, is defined in "krb.h". - */ - -long krb_rd_safe(in,in_length,key,sender,receiver,m_data) - u_char *in; /* pointer to the msg received */ - u_long in_length; /* length of "in" msg */ - C_Block *key; /* encryption key for seed and ivec */ - struct sockaddr_in *sender; /* sender's address */ - struct sockaddr_in *receiver; /* receiver's address -- me */ - MSG_DAT *m_data; /* where to put message information */ -{ - register u_char *p,*q; - static u_long src_addr; /* Can't send structs since no - * guarantees on size */ - /* Be very conservative */ - if (sizeof(u_long) != sizeof(struct in_addr)) { - fprintf(stderr,"\n\ -krb_rd_safe protocol err sizeof(u_long) != sizeof(struct in_addr)"); - exit(-1); - } - - if (gettimeofday(&local_time,(struct timezone *)0)) - return -1; - - p = in; /* beginning of message */ - swap_bytes = 0; - - if (*p++ != KRB_PROT_VERSION) return RD_AP_VERSION; - if (((*p) & ~1) != AUTH_MSG_SAFE) return RD_AP_MSG_TYPE; - if ((*p++ & 1) != HOST_BYTE_ORDER) swap_bytes++; - - q = p; /* mark start of cksum stuff */ - - /* safely get length */ - bcopy((char *)p,(char *)&(m_data->app_length), - sizeof(m_data->app_length)); - if (swap_bytes) swap_u_long(m_data->app_length); - p += sizeof(m_data->app_length); /* skip over */ - - if (m_data->app_length + sizeof(in_length) - + sizeof(m_data->time_sec) + sizeof(m_data->time_5ms) - + sizeof(big_cksum) + sizeof(src_addr) - + VERSION_SZ + MSG_TYPE_SZ > in_length) - return(RD_AP_MODIFIED); - - m_data->app_data = p; /* we're now at the application data */ - - /* skip app data */ - p += m_data->app_length; - - /* safely get time_5ms */ - bcopy((char *)p, (char *)&(m_data->time_5ms), - sizeof(m_data->time_5ms)); - - /* don't need to swap-- one byte for now */ - p += sizeof(m_data->time_5ms); - - /* safely get src address */ - bcopy((char *)p,(char *)&src_addr,sizeof(src_addr)); - - /* don't swap, net order always */ - p += sizeof(src_addr); - - if (src_addr != (u_long) sender->sin_addr.s_addr) - return RD_AP_MODIFIED; - - /* safely get time_sec */ - bcopy((char *)p, (char *)&(m_data->time_sec), - sizeof(m_data->time_sec)); - if (swap_bytes) - swap_u_long(m_data->time_sec); - p += sizeof(m_data->time_sec); - - /* check direction bit is the sign bit */ - /* For compatibility with broken old code, compares are done in VAX - byte order (LSBFIRST) */ - if (lsb_net_ulong_less(sender->sin_addr.s_addr, - receiver->sin_addr.s_addr)==-1) - /* src < recv */ - m_data->time_sec = - m_data->time_sec; - else if (lsb_net_ulong_less(sender->sin_addr.s_addr, - receiver->sin_addr.s_addr)==0) - if (lsb_net_ushort_less(sender->sin_port,receiver->sin_port)==-1) - /* src < recv */ - m_data->time_sec = - m_data->time_sec; - - /* - * All that for one tiny bit! Heaven help those that talk to - * themselves. - */ - - /* check the time integrity of the msg */ - delta_t = abs((int)((long) local_time.tv_sec - m_data->time_sec)); - if (delta_t > CLOCK_SKEW) return RD_AP_TIME; - - /* - * caller must check timestamps for proper order and replays, since - * server might have multiple clients each with its own timestamps - * and we don't assume tightly synchronized clocks. - */ - - bcopy((char *)p,(char *)big_cksum,sizeof(big_cksum)); - if (swap_bytes) swap_u_16(big_cksum); - -#ifdef NOENCRYPTION - bzero(calc_cksum, sizeof(calc_cksum)); -#else - quad_cksum((C_Block *)q,calc_cksum,p-q,2,key); -#endif - - if (krb_debug) - printf("\ncalc_cksum = %lu, received cksum = %lu", - (long) calc_cksum[0], (long) big_cksum[0]); - if (bcmp((char *)big_cksum,(char *)calc_cksum,sizeof(big_cksum))) - return(RD_AP_MODIFIED); - - return(RD_AP_OK); /* OK == 0 */ -} |
