2 * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska H
\9agskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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7 * modification, are permitted provided that the following conditions
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19 * This product includes software developed by the Kungliga Tekniska
20 * H
\9agskolan and its contributors.
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39 #include "sasl_mac_krb_locl.h"
41 RCSID("$Id: rd_priv.c,v 1.2 2001/12/04 02:06:09 rjs3 Exp $");
43 /* application include files */
44 #include "krb-archaeology.h"
47 * krb_rd_priv() decrypts and checks the integrity of an
48 * AUTH_MSG_PRIVATE message. Given the message received, "in",
49 * the length of that message, "in_length", the key "schedule"
50 * and "key", and the network addresses of the
51 * "sender" and "receiver" of the message, krb_rd_safe() returns
52 * RD_AP_OK if the message is okay, otherwise some error code.
54 * The message data retrieved from "in" are returned in the structure
55 * "m_data". The pointer to the application data
56 * (m_data->app_data) refers back to the appropriate place in "in".
58 * See the file "mk_priv.c" for the format of the AUTH_MSG_PRIVATE
59 * message. The structure containing the extracted message
60 * information, MSG_DAT, is defined in "krb.h".
64 krb_rd_priv(void *in, u_int32_t in_length,
65 struct des_ks_struct *schedule, des_cblock *key,
66 struct sockaddr_in *sender, struct sockaddr_in *receiver,
69 unsigned char *p = (unsigned char*)in;
76 unsigned char pvno, type;
79 if(pvno != KRB_PROT_VERSION)
83 little_endian = type & 1;
86 p += krb_get_int(p, &clen, 4, little_endian);
88 if(clen + 2 > in_length)
89 return RD_AP_MODIFIED;
91 des_pcbc_encrypt((des_cblock*)p, (des_cblock*)p, clen,
92 schedule, key, DES_DECRYPT);
94 p += krb_get_int(p, &m_data->app_length, 4, little_endian);
95 if(m_data->app_length + 17 > in_length)
96 return RD_AP_MODIFIED;
99 p += m_data->app_length;
101 m_data->time_5ms = *p++;
103 p += krb_get_address(p, &src_addr);
105 if (!krb_equiv(src_addr, sender->sin_addr.s_addr))
108 p += krb_get_int(p, (u_int32_t *)&m_data->time_sec, 4, little_endian);
110 m_data->time_sec = lsb_time(m_data->time_sec, sender, receiver);
112 gettimeofday(&tv, NULL);
114 /* check the time integrity of the msg */
115 delta_t = abs((int)((long) tv.tv_sec - m_data->time_sec));
116 if (delta_t > CLOCK_SKEW)
119 krb_warning("delta_t = %d\n", (int) delta_t);
122 * caller must check timestamps for proper order and
123 * replays, since server might have multiple clients
124 * each with its own timestamps and we don't assume
125 * tightly synchronized clocks.