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 #ifdef HAVE_OPENSSL
  67 #include <openssl/des.h>
  68 #else
  69 #include <des.h>
  70 #endif
  71
  72 #undef RCSID
  73 #include <rx/rx.h>
  74 #undef RCSID
  75 #define RCSID(msg) \
  76 static /**/const char *const rcsid[] = { (char *)rcsid, "\100(#)" msg }
  77
  78 extern int rx_epoch, rx_nextCid;
  79
  80 #include "rxkad.h"
  81
  82 #define rxkad_disipline 3
  83
  84 #define rxkad_unallocated 1
  85 #define rxkad_authenticated 2
  86 #define rxkad_expired 4
  87 #define rxkad_checksummed 8
  88
  89 #define ROUNDS 16
  90
  91 #define FC_ENCRYPT      1
  92 #define FC_DECRYPT      0
  93
  94 int fc_keysched(const void *key_, int32_t sched[ROUNDS]);
  95
  96 /* In_ and out_ MUST be uint32_t aligned */
  97 int fc_ecb_encrypt(const void *in_, void *out_,
  98                    const int32_t sched[ROUNDS], int encrypt);
  99
 100 /* In_ and out_ MUST be uint32_t aligned */
 101 int fc_cbc_encrypt(const void *in_, void *out_, int32_t length,
 102                    const int32_t sched[ROUNDS], uint32_t iv[2],
 103                    int encrypt);
 104
 105 int rxkad_EncryptPacket(const void *rx_connection_not_used,
 106                         const int32_t sched[ROUNDS], const uint32_t iv[2],
 107                         int len, struct rx_packet *packet);
 108
 109 int rxkad_DecryptPacket(const void *rx_connection_not_used,
 110                         const int32_t sched[ROUNDS], const uint32_t iv[2],
 111                         int len, struct rx_packet *packet);
 112
 113 #ifdef __GNUC__
 114 static inline
 115 void
 116 fc_cbc_enc2(const void *in, void *out, int32_t length, const int32_t sched[ROUNDS],
 117             const uint32_t iv_[2], int encrypt)
 118 {
 119   uint32_t iv[2];
 120   iv[0] = iv_[0];
 121   iv[1] = iv_[1];
 122   fc_cbc_encrypt(in, out, length, sched, iv, encrypt);
 123 }
 124 #else
 125 #define fc_cbc_enc2(in, out, length, sched, iv_, encrypt) \
 126 { uint32_t _iv_[2]; uint32_t *_tmp_ = (iv_); \
 127   memcpy(_iv_, _tmp_, 8);  \
 128   fc_cbc_encrypt((in), (out), (length), (sched), (_iv_), (encrypt)); }
 129 #endif
 130
 131 #define RXKAD_VERSION 2
 132
 133 /* Version 2 challenge format */
 134 typedef struct rxkad_challenge {
 135   int32_t version;
 136   int32_t nonce;
 137   int32_t min_level;
 138   int32_t unused;
 139 } rxkad_challenge;
 140
 141 /* To protect the client from being used as an oracle the response
 142  * contains connection specific information. */
 143 typedef struct rxkad_response {
 144   int32_t version;
 145   int32_t unused;
 146   struct {
 147     int32_t epoch;
 148     int32_t cid;
 149     uint32_t cksum;             /* Cksum of this response */
 150     int32_t security_index;
 151     int32_t call_numbers[RX_MAXCALLS];
 152     int32_t inc_nonce;
 153     int32_t level;
 154   } encrypted;
 155   int32_t kvno;
 156   int32_t ticket_len;
 157   /* u_char the_ticket[ticket_len]; */
 158 } rxkad_response;
 159
 160 typedef struct key_stuff {
 161   int32_t keysched[ROUNDS];
 162   struct ktc_encryptionKey key;
 163 } key_stuff;
 164
 165 typedef struct end_stuff {
 166   uint32_t header_iv[2];
 167   uint32_t bytesReceived, packetsReceived, bytesSent, packetsSent;
 168 } end_stuff;
 169
 170 uint32_t
 171 rxkad_cksum_response(rxkad_response *r);
 172
 173 void
 174 rxkad_calc_header_iv(const struct rx_connection *conn,
 175                      const int32_t sched[ROUNDS],
 176                      char *in_iv,
 177                      uint32_t out_iv[2]);
 178
 179 int
 180 rxkad_prepare_packet(struct rx_packet *pkt, struct rx_connection *con,
 181                      int level, key_stuff *k, end_stuff *e);
 182
 183 int
 184 rxkad_check_packet(struct rx_packet *pkt, struct rx_connection *con,
 185                    int level, key_stuff *k, end_stuff *e);
 186
 187 /* Per connection specific server data */
 188 typedef struct serv_con_data {
 189   end_stuff e;
 190   key_stuff k;
 191   uint32_t expires;
 192   int32_t nonce;
 193   char *user;
 194   rxkad_level cur_level;        /* Starts at min_level and can only increase */
 195   char authenticated;
 196 } serv_con_data;
 197
 198 #endif /* __RXKAD_LOCL_H */