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annotate arogue5/xcrypt.c @ 176:db1c9a21a7c3

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srogue: prevent overflowing the score file name. If SCOREFILE is not defined, roguehome() is called to find a directory for the score file. It copies up to PATH_MAX-20 bytes from an environment variable to a static buffer. Later these are strcpy()'d to scorefile, which is of size LINLEN. Unfortunately LINLEN is 80 and PATH_MAX is at least 256. On Linux, it happens to be 4096. I haven't yet managed to crash or exploit it, but there are surely no beneficial consequences, so roguehome() has been modified to check the length, and the string it returns is also checked in main().
author John "Elwin" Edwards
date Sun, 02 Aug 2015 12:14:47 -0400
parents 0ed67132cf10
children 56e748983fa8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * FreeSec: libcrypt
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3 *
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4 * Copyright (C) 1994 David Burren
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5 * All rights reserved.
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6 *
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7 * Redistribution and use in source and binary forms, with or without
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8 * modification, are permitted provided that the following conditions
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9 * are met:
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10 * 1. Redistributions of source code must retain the above copyright
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11 * notice, this list of conditions and the following disclaimer.
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 * 3. Neither the name(s) of the author(s) nor the names of other contributors
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16 * may be used to endorse or promote products derived from this software
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17 * without specific prior written permission.
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18 *
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19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) AND CONTRIBUTORS ``AS IS'' AND
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20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) OR CONTRIBUTORS BE LIABLE
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23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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29 * SUCH DAMAGE.
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30 *
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31 *
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32 * This is an original implementation of the DES and the crypt(3) interfaces
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33 * by David Burren <davidb@werj.com.au>.
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34 *
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35 * An excellent reference on the underlying algorithm (and related
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36 * algorithms) is:
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37 *
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38 * B. Schneier, Applied Cryptography: protocols, algorithms,
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39 * and source code in C, John Wiley & Sons, 1994.
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40 *
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41 * Note that in that book's description of DES the lookups for the initial,
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42 * pbox, and final permutations are inverted (this has been brought to the
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43 * attention of the author). A list of errata for this book has been
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44 * posted to the sci.crypt newsgroup by the author and is available for FTP.
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45 *
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46 * NOTE:
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47 * This file has a static version of des_setkey() so that crypt.o exports
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48 * only the crypt() interface. This is required to make binaries linked
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49 * against crypt.o exportable or re-exportable from the USA.
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50 */
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51
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52 #include <sys/types.h>
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53 #include <string.h>
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54
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55 #ifdef DEBUG
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56 # include <stdio.h>
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57 #endif
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58 #define _PASSWORD_EFMT1 '_'
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59
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60 static unsigned char IP[64] = {
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61 58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4,
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62 62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48, 40, 32, 24, 16, 8,
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63 57, 49, 41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27, 19, 11, 3,
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64 61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7
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65 };
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66
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67 static unsigned char inv_key_perm[64];
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68 static unsigned char key_perm[56] = {
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69 57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18,
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70 10, 2, 59, 51, 43, 35, 27, 19, 11, 3, 60, 52, 44, 36,
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71 63, 55, 47, 39, 31, 23, 15, 7, 62, 54, 46, 38, 30, 22,
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72 14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 28, 20, 12, 4
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73 };
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74
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75 static unsigned char key_shifts[16] = {
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76 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1
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77 };
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78
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79 static unsigned char inv_comp_perm[56];
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80 static unsigned char comp_perm[48] = {
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81 14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10,
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82 23, 19, 12, 4, 26, 8, 16, 7, 27, 20, 13, 2,
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83 41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48,
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84 44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32
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85 };
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86
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87 /*
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88 * No E box is used, as it's replaced by some ANDs, shifts, and ORs.
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89 */
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90
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91 static unsigned char u_sbox[8][64];
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92 static unsigned char sbox[8][64] = {
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93 {
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94 14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,
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95 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,
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96 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,
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97 15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13
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98 },
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99 {
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100 15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,
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101 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,
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