03656ac1b0
the "core" Kerberos functionality. The rest of the userland will get their own changes later.
130 lines
4.4 KiB
C
130 lines
4.4 KiB
C
/*
|
|
* Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
|
|
* (Royal Institute of Technology, Stockholm, Sweden).
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the Kungliga Tekniska
|
|
* Högskolan and its contributors.
|
|
*
|
|
* 4. Neither the name of the Institute nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "krb_locl.h"
|
|
|
|
RCSID("$Id: rd_priv.c,v 1.24 1997/05/14 17:53:29 joda Exp $");
|
|
|
|
/* application include files */
|
|
#include "lsb_addr_comp.h"
|
|
|
|
/*
|
|
* krb_rd_priv() decrypts and checks the integrity of an
|
|
* AUTH_MSG_PRIVATE message. Given the message received, "in",
|
|
* the length of that message, "in_length", the key "schedule"
|
|
* and "key", and the network addresses of the
|
|
* "sender" and "receiver" of the message, krb_rd_safe() returns
|
|
* RD_AP_OK if the message is okay, otherwise some error code.
|
|
*
|
|
* The message data retrieved from "in" are 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_priv.c" for the format of the AUTH_MSG_PRIVATE
|
|
* message. The structure containing the extracted message
|
|
* information, MSG_DAT, is defined in "krb.h".
|
|
*/
|
|
|
|
int32_t
|
|
krb_rd_priv(void *in, u_int32_t in_length,
|
|
struct des_ks_struct *schedule, des_cblock *key,
|
|
struct sockaddr_in *sender, struct sockaddr_in *receiver,
|
|
MSG_DAT *m_data)
|
|
{
|
|
unsigned char *p = (unsigned char*)in;
|
|
int little_endian;
|
|
u_int32_t clen;
|
|
struct timeval tv;
|
|
u_int32_t src_addr;
|
|
int delta_t;
|
|
|
|
unsigned char pvno, type;
|
|
|
|
pvno = *p++;
|
|
if(pvno != KRB_PROT_VERSION)
|
|
return RD_AP_VERSION;
|
|
|
|
type = *p++;
|
|
little_endian = type & 1;
|
|
type &= ~1;
|
|
|
|
p += krb_get_int(p, &clen, 4, little_endian);
|
|
|
|
if(clen + 2 > in_length)
|
|
return RD_AP_MODIFIED;
|
|
|
|
des_pcbc_encrypt((des_cblock*)p, (des_cblock*)p, clen,
|
|
schedule, key, DES_DECRYPT);
|
|
|
|
p += krb_get_int(p, &m_data->app_length, 4, little_endian);
|
|
if(m_data->app_length + 17 > in_length)
|
|
return RD_AP_MODIFIED;
|
|
|
|
m_data->app_data = p;
|
|
p += m_data->app_length;
|
|
|
|
m_data->time_5ms = *p++;
|
|
|
|
p += krb_get_address(p, &src_addr);
|
|
|
|
if (!krb_equiv(src_addr, sender->sin_addr.s_addr))
|
|
return RD_AP_BADD;
|
|
|
|
p += krb_get_int(p, (u_int32_t *)&m_data->time_sec, 4, little_endian);
|
|
|
|
m_data->time_sec = lsb_time(m_data->time_sec, sender, receiver);
|
|
|
|
gettimeofday(&tv, NULL);
|
|
|
|
/* check the time integrity of the msg */
|
|
delta_t = abs((int)((long) tv.tv_sec - m_data->time_sec));
|
|
if (delta_t > CLOCK_SKEW)
|
|
return RD_AP_TIME;
|
|
if (krb_debug)
|
|
krb_warning("\ndelta_t = %d", (int) delta_t);
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
return KSUCCESS;
|
|
}
|