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annotate arogue5/main.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 aac28331e71d
children 56e748983fa8
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1 /*
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2 * Rogue
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3 *
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4 * Advanced Rogue
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5 * Copyright (C) 1984, 1985 Michael Morgan, Ken Dalka and AT&T
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6 * All rights reserved.
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7 *
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8 * Based on "Rogue: Exploring the Dungeons of Doom"
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9 * Copyright (C) 1980, 1981 Michael Toy, Ken Arnold and Glenn Wichman
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10 * All rights reserved.
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11 *
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12 * See the file LICENSE.TXT for full copyright and licensing information.
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13 */
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14
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15 #include "curses.h"
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16 #include <stdlib.h>
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17 #include <string.h>
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18 #include <fcntl.h>
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19 #include <sys/stat.h>
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20 #include <limits.h>
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21 #include <signal.h>
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22 #include <time.h>
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23 #include "mach_dep.h"
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24 #include "network.h"
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25 #include "rogue.h"
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26
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27 #ifdef CHECKTIME
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28 static int num_checks; /* times we've gone over in checkout() */
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29 #endif
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30
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31 /*
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32 * fruits that you get at startup
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33 */
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34 static char *funfruit[] = {
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35 "candleberry", "caprifig", "dewberry", "elderberry",
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36 "gooseberry", "guanabana", "hagberry", "ilama",
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37 "imbu", "jaboticaba", "jujube", "litchi",
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38 "mombin", "pitanga", "prickly pear", "rambutan",
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39 "sapodilla", "soursop", "sweetsop", "whortleberry",
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40 "jellybean", "apple", "strawberry", "blueberry",
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41 "peach", "banana"
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42 };
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43 #define NFRUIT (sizeof(funfruit) / sizeof (char *))
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44
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45 void open_records(void);
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46
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47 main(argc, argv, envp)
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48 char **argv;
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49 char **envp;
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50 {
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51 register char *env;
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52 int lowtime;
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53 time_t now;
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54 char *roguedir;
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56 roguedir = md_getroguedir();
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57 md_init();
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58
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59 /*
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60 * get home and options from environment
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61 */
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62 strncpy(home,md_gethomedir(),LINELEN);
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63
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64 #ifdef SAVEDIR
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65 if (argc >= 3 && !strcmp(argv[1], "-n")) {
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66 use_savedir = TRUE;
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67 strncpy(whoami, argv[2], LINELEN);
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68 whoami[LINELEN - 1] = '\0';
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69 if (snprintf(file_name, 256, "%s/%d-%s.ar5sav", SAVEDIR,
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70 md_getuid(), whoami) >= 256)
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71 {
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72 /* The name is too long */
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73 use_savedir = FALSE;
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74 }
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75 }
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76 #endif
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77 /* Get default save file */
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78 if (!use_savedir) {
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79 strcpy(file_name, home);
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80 strcat(file_name, "arogue58.sav");
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81 }
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82
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83 #ifdef SCOREFILE
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84 strncpy(score_file, SCOREFILE, LINELEN);
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85 score_file[LINELEN - 1] = '\0';
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86 #else
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87 /* Get default score file */
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88 strcpy(score_file, roguedir);
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89
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90 if (*score_file)
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91 strcat(score_file,"/");
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92
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93 strcat(score_file, "arogue58.scr");
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94 #endif
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95
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96 if ((env = getenv("ROGUEOPTS")) != NULL)
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97 parse_opts(env);
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99 if (!use_savedir && whoami[0] == '\0')
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