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annotate rogue3/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 ee250e3646fd
children 12e070d1a780
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1 /*
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2 * @(#)main.c 3.27 (Berkeley) 6/15/81
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3 *
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4 * Rogue: Exploring the Dungeons of Doom
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5 * Copyright (C) 1980, 1981 Michael Toy, Ken Arnold and Glenn Wichman
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6 * All rights reserved.
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7 *
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8 * See the file LICENSE.TXT for full copyright and licensing information.
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9 */
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10
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11 #include "curses.h"
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12 #include <time.h>
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13 #include <signal.h>
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14 #include <limits.h>
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15 #include <stdlib.h>
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16 #include <stdarg.h>
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17 #include <string.h>
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18 #include "machdep.h"
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19 #include "rogue.h"
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20
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21 int num_checks = 0; /* times we've gone over in checkout() */
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22 WINDOW *cw; /* Window that the player sees */
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23 WINDOW *hw; /* Used for the help command */
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24 WINDOW *mw; /* Used to store mosnters */
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25 FILE *scoreboard = NULL;
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26 FILE *logfi = NULL;
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28 main(argc, argv, envp)
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29 char **argv;
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30 char **envp;
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31 {
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32 char *env;
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33 struct linked_list *item;
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34 struct object *obj;
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35 int lowtime;
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36 time_t now;
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37
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38 md_init(MD_STRIP_CTRL_KEYPAD);
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39
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40 open_score();
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41 open_log();
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42
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43 /*
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44 * check for print-score option
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45 */
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46 if (argc == 2 && strcmp(argv[1], "-s") == 0)
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47 {
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48 waswizard = TRUE;
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49 score(0, -1, 0);
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50 exit(0);
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51 }
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52
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53 #ifdef WIZARD
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54 /*
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55 * Check to see if he is a wizard
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56 */
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57 if (argc >= 2 && argv[1][0] == '\0')
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58 if (strcmp(PASSWD, crypt(md_getpass("Wizard's password: "), "mT")) == 0)
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59 {
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60 wizard = TRUE;
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61 argv++;
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62 argc--;
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63 }
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64 #endif
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65
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66 /* Are we using the system savefile directory? */
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67 #ifdef SAVEDIR
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68 if (argc >= 3 && !strcmp(argv[1], "-n"))
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69 {
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70 strncpy(whoami, argv[2], 79);
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71 whoami[79] = '\0';
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72 use_savedir = TRUE;
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73 /* look for savefile at SAVEDIR/UID-playername.r3sav */
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74 if (snprintf(file_name, 256, "%s/%d-%s.r3sav", SAVEDIR, md_getuid(), whoami) >= 256)
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75 {
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76 /* this shouldn't happen */
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77 strcpy(file_name, "rogue3.save");
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78 use_savedir = FALSE;
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79 }
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80 }
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81 #endif
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82
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83 if (use_savedir == FALSE)
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84 {
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85 md_normaluser();
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86 /* because we don't need to create a file in the common savedir,
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87 * and the scorefile is already open */
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88 strcpy(home, md_gethomedir());
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89
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90 if (strlen(home) > PATH_MAX - strlen("rogue3.save") - 1)
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91 *home = 0;
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92
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93 strcpy(file_name, home);
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94 strcat(file_name, "rogue3.save");
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95 }
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96
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97 if ((env = getenv("ROGUEOPTS")) != NULL)
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98 parse_opts(env);
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99 if (!use_savedir && (env == NULL || whoami[0] == '\0'))
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