2 * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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33 /* $FreeBSD: src/crypto/kerberosIV/lib/krb/rd_priv.c,v 1.1.1.3.2.1 2003/02/13 21:34:36 nectar Exp $ */
37 RCSID("$Id: rd_priv.c,v 1.27 1999/12/02 16:58:43 joda Exp $");
39 /* application include files */
40 #include "krb-archaeology.h"
43 * krb_rd_priv() decrypts and checks the integrity of an
44 * AUTH_MSG_PRIVATE message. Given the message received, "in",
45 * the length of that message, "in_length", the key "schedule"
46 * and "key", and the network addresses of the
47 * "sender" and "receiver" of the message, krb_rd_safe() returns
48 * RD_AP_OK if the message is okay, otherwise some error code.
50 * The message data retrieved from "in" are returned in the structure
51 * "m_data". The pointer to the application data
52 * (m_data->app_data) refers back to the appropriate place in "in".
54 * See the file "mk_priv.c" for the format of the AUTH_MSG_PRIVATE
55 * message. The structure containing the extracted message
56 * information, MSG_DAT, is defined in "krb.h".
60 krb_rd_priv(void *in, u_int32_t in_length,
61 des_key_schedule schedule, des_cblock *key,
62 struct sockaddr_in *sender, struct sockaddr_in *receiver,
65 unsigned char *p = (unsigned char*)in;
72 unsigned char pvno, type;
75 if(pvno != KRB_PROT_VERSION)
79 little_endian = type & 1;
82 p += krb_get_int(p, &clen, 4, little_endian);
84 if(clen + 2 > in_length)
85 return RD_AP_MODIFIED;
87 des_pcbc_encrypt((des_cblock*)p, (des_cblock*)p, clen,
88 schedule, key, DES_DECRYPT);
90 p += krb_get_int(p, &m_data->app_length, 4, little_endian);
91 if(m_data->app_length + 17 > in_length)
92 return RD_AP_MODIFIED;
95 p += m_data->app_length;
97 m_data->time_5ms = *p++;
99 p += krb_get_address(p, &src_addr);
101 if (!krb_equiv(src_addr, sender->sin_addr.s_addr))
104 p += krb_get_int(p, (u_int32_t *)&m_data->time_sec, 4, little_endian);
106 m_data->time_sec = lsb_time(m_data->time_sec, sender, receiver);
108 gettimeofday(&tv, NULL);
110 /* check the time integrity of the msg */
111 delta_t = abs((int)((long) tv.tv_sec - m_data->time_sec));
112 if (delta_t > CLOCK_SKEW)
115 krb_warning("delta_t = %d\n", (int) delta_t);
118 * caller must check timestamps for proper order and
119 * replays, since server might have multiple clients
120 * each with its own timestamps and we don't assume
121 * tightly synchronized clocks.