rxgk/rxgk_ticket.c

   1 /*
   2  * Copyright (c) 1995 - 1998, 2002 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 #include "rxgk_locl.h"
  35
  36 RCSID("$Id$");
  37
  38 #include <errno.h>
  39
  40 #include "rxgk_proto.h"
  41
  42 int
  43 rxgk_encrypt_ticket(struct rxgk_ticket *ticket, RXGK_Ticket_Crypt *opaque)
  44 {
  45     int ret;
  46     char *buf;
  47     size_t len;
  48     RXGK_Token clear, crypt;
  49     struct rxgk_keyblock key;
  50
  51     len = RXGK_TICKET_MAX_SIZE;
  52     buf = malloc(RXGK_TICKET_MAX_SIZE);
  53
  54     if (ydr_encode_rxgk_ticket(ticket, buf, &len) == NULL) {
  55         return errno;
  56     }
  57
  58     clear.val = buf;
  59     clear.len = RXGK_TICKET_MAX_SIZE - len;
  60
  61 #if DEBUG
  62     fprintf(stderr, "before encrypt:");
  63     print_chararray(clear.val, clear.len);
  64 #endif
  65
  66     ret = rxgk_get_server_ticket_key(&key);
  67     if (ret) {
  68         free(buf);
  69         return EINVAL;
  70     }
  71
  72     ret = rxgk_encrypt_buffer(&clear, &crypt, &key, RXGK_SERVER_ENC_TICKET);
  73     if (ret) {
  74         free(key.data);
  75         free(buf);
  76         return EINVAL;
  77     }
  78
  79     opaque->val = crypt.val;
  80     opaque->len = crypt.len;
  81
  82 #if DEBUG
  83     fprintf(stderr, "after encrypt:");
  84     print_chararray(crypt.val, crypt.len);
  85 #endif
  86
  87     return 0;
  88 }
  89
  90 int
  91 rxgk_decrypt_ticket(RXGK_Ticket_Crypt *opaque, struct rxgk_ticket *ticket)
  92 {
  93     size_t len;
  94     int ret;
  95     RXGK_Token clear, crypt;
  96     struct rxgk_keyblock key;
  97
  98     ret = rxgk_get_server_ticket_key(&key);
  99     if (ret) {
 100         return EINVAL;
 101     }
 102
 103     crypt.val = opaque->val;
 104     crypt.len = opaque->len;
 105
 106 #if DEBUG
 107     fprintf(stderr, "before decrypt:");
 108     print_chararray(crypt.val, crypt.len);
 109 #endif
 110
 111     ret = rxgk_decrypt_buffer(&crypt, &clear, &key, RXGK_SERVER_ENC_TICKET);
 112     if (ret) {
 113         free(key.data);
 114         return EINVAL;
 115     }
 116
 117 #if DEBUG
 118     fprintf(stderr, "after decrypt:");
 119     print_chararray(clear.val, clear.len);
 120 #endif
 121
 122     len = clear.len;
 123     if (ydr_decode_rxgk_ticket(ticket, clear.val, &len) == NULL) {
 124         return errno;
 125     }
 126
 127     return 0;
 128 }
 129
 130 int
 131 rxgk_get_server_ticket_key(struct rxgk_keyblock *key)
 132 {
 133     int i;
 134     /* XXX get real key */
 135
 136     key->length = 32;
 137     key->enctype = RXGK_CRYPTO_AES256_CTS_HMAC_SHA1_96;
 138
 139     key->data = malloc(key->length);
 140     if (key->data == NULL)
 141         return ENOMEM;
 142
 143     for (i = 0; i < key->length; i++) {
 144         ((unsigned char *)key->data)[i] = 0x23 + i * 47;
 145     }
 146
 147     return 0;
 148 }
 149