diff options
Diffstat (limited to 'crypto/kerberosIV/lib/krb/rd_priv.c')
-rw-r--r-- | crypto/kerberosIV/lib/krb/rd_priv.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/crypto/kerberosIV/lib/krb/rd_priv.c b/crypto/kerberosIV/lib/krb/rd_priv.c new file mode 100644 index 0000000..0bb0a40 --- /dev/null +++ b/crypto/kerberosIV/lib/krb/rd_priv.c @@ -0,0 +1,124 @@ +/* + * 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. 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 1.27 1999/12/02 16:58:43 joda Exp $"); + +/* application include files */ +#include "krb-archaeology.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("delta_t = %d\n", (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; +} |