rxkad/rxkad_locl.h

   1 /*
   2  * Copyright (c) 1995, 1996, 1997, 2003 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /* @(#)$Id$ */
  35
  36 #ifndef __RXKAD_LOCL_H
  37 #define __RXKAD_LOCL_H
  38
  39 /* $Id$ */
  40
  41 #ifdef HAVE_CONFIG_H
  42 #include <config.h>
  43 #endif
  44
  45 #include <stdlib.h>
  46 #include <string.h>
  47 #include <limits.h>
  48 #include <time.h>
  49 #include <errno.h>
  50
  51 #include <sys/types.h>
  52 #include <netinet/in.h>
  53
  54 #include <roken.h>    /* sometimes needed for strlcpy */
  55
  56 #ifdef NDEBUG
  57 #ifndef assert
  58 #define assert(e) ((void)0)
  59 #endif
  60 #else
  61 #ifndef assert
  62 #define assert(e) ((e) ? (void)0 : (void)osi_Panic("assert(%s) failed: file %s, line %d\n", #e, __FILE__, __LINE__, #e))
  63 #endif
  64 #endif
  65
  66 /*
  67  * disable server side for now to get rid of des.h dependency
  68  * -- milko's not in working condition anyway
  69  */
  70 #if 0
  71 #ifdef HAVE_OPENSSL
  72 #include <openssl/des.h>
  73 #else
  74 #include <des.h>
  75 #endif
  76 #endif
  77
  78 #undef RCSID
  79 #include <rx/rx.h>
  80 #undef RCSID
  81 #define RCSID(msg) \
  82 static /**/const char *const rcsid[] = { (char *)rcsid, "\100(#)" msg }
  83
  84 extern int rx_epoch, rx_nextCid;
  85
  86 #include "rxkad.h"
  87
  88 #define rxkad_disipline 3
  89
  90 #define rxkad_unallocated 1
  91 #define rxkad_authenticated 2
  92 #define rxkad_expired 4
  93 #define rxkad_checksummed 8
  94
  95 #define ROUNDS 16
  96
  97 #define FC_ENCRYPT      1
  98 #define FC_DECRYPT      0
  99
 100 int fc_keysched(const void *key_, int32_t sched[ROUNDS]);
 101
 102 /* In_ and out_ MUST be uint32_t aligned */
 103 int fc_ecb_encrypt(const void *in_, void *out_,
 104                    const int32_t sched[ROUNDS], int encrypt);
 105
 106 /* In_ and out_ MUST be uint32_t aligned */
 107 int fc_cbc_encrypt(const void *in_, void *out_, int32_t length,
 108                    const int32_t sched[ROUNDS], uint32_t iv[2],
 109                    int encrypt);
 110
 111 int rxkad_EncryptPacket(const void *rx_connection_not_used,
 112                         const int32_t sched[ROUNDS], const uint32_t iv[2],
 113                         int len, struct rx_packet *packet);
 114
 115 int rxkad_DecryptPacket(const void *rx_connection_not_used,
 116                         const int32_t sched[ROUNDS], const uint32_t iv[2],
 117                         int len, struct rx_packet *packet);
 118
 119 #ifdef __GNUC__
 120 static inline
 121 void
 122 fc_cbc_enc2(const void *in, void *out, int32_t length, const int32_t sched[ROUNDS],
 123             const uint32_t iv_[2], int encrypt)
 124 {
 125   uint32_t iv[2];
 126   iv[0] = iv_[0];
 127   iv[1] = iv_[1];
 128   fc_cbc_encrypt(in, out, length, sched, iv, encrypt);
 129 }
 130 #else
 131 #define fc_cbc_enc2(in, out, length, sched, iv_, encrypt) \
 132 { uint32_t _iv_[2]; uint32_t *_tmp_ = (iv_); \
 133   memcpy(_iv_, _tmp_, 8);  \
 134   fc_cbc_encrypt((in), (out), (length), (sched), (_iv_), (encrypt)); }
 135 #endif
 136
 137 #define RXKAD_VERSION 2
 138
 139 /* Version 2 challenge format */
 140 typedef struct rxkad_challenge {
 141   int32_t version;
 142   int32_t nonce;
 143   int32_t min_level;
 144   int32_t unused;
 145 } rxkad_challenge;
 146
 147 /* To protect the client from being used as an oracle the response
 148  * contains connection specific information. */
 149 typedef struct rxkad_response {
 150   int32_t version;
 151   int32_t unused;
 152   struct {
 153     int32_t epoch;
 154     int32_t cid;
 155     uint32_t cksum;             /* Cksum of this response */
 156     int32_t security_index;
 157     int32_t call_numbers[RX_MAXCALLS];
 158     int32_t inc_nonce;
 159     int32_t level;
 160   } encrypted;
 161   int32_t kvno;
 162   int32_t ticket_len;
 163   /* u_char the_ticket[ticket_len]; */
 164 } rxkad_response;
 165
 166 typedef struct key_stuff {
 167   int32_t keysched[ROUNDS];
 168   struct ktc_encryptionKey key;
 169 } key_stuff;
 170
 171 typedef struct end_stuff {
 172   uint32_t header_iv[2];
 173   uint32_t bytesReceived, packetsReceived, bytesSent, packetsSent;
 174 } end_stuff;
 175
 176 uint32_t
 177 rxkad_cksum_response(rxkad_response *r);
 178
 179 void
 180 rxkad_calc_header_iv(const struct rx_connection *conn,
 181                      const int32_t sched[ROUNDS],
 182                      char *in_iv,
 183                      uint32_t out_iv[2]);
 184
 185 int
 186 rxkad_prepare_packet(struct rx_packet *pkt, struct rx_connection *con,
 187                      int level, key_stuff *k, end_stuff *e);
 188
 189 int
 190 rxkad_check_packet(struct rx_packet *pkt, struct rx_connection *con,
 191                    int level, key_stuff *k, end_stuff *e);
 192
 193 /* Per connection specific server data */
 194 typedef struct serv_con_data {
 195   end_stuff e;
 196   key_stuff k;
 197   uint32_t expires;
 198   int32_t nonce;
 199   char *user;
 200   rxkad_level cur_level;        /* Starts at min_level and can only increase */
 201   char authenticated;
 202 } serv_con_data;
 203
 204 #endif /* __RXKAD_LOCL_H */