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annotate rogue5/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 3d4252fa2ed3
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1 /*
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2 * Rogue: Exploring the Dungeons of Doom
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3 * Copyright (C) 1980-1983, 1985, 1999 Michael Toy, Ken Arnold and Glenn Wichman
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4 * All rights reserved.
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5 *
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6 * See the file LICENSE.TXT for full copyright and licensing information.
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7 *
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8 * @(#)main.c 4.22 (Berkeley) 02/05/99
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9 */
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10
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11 #include <stdlib.h>
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12 #include <string.h>
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13 #include <signal.h>
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14 #include <time.h>
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15 #include <curses.h>
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16 #include "rogue.h"
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17
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18 /*
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19 * main:
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20 * The main program, of course
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21 */
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22 int
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23 main(int argc, char **argv)
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24 {
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25 char *env;
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26 time_t lowtime;
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27
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28 md_init();
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29
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30 #ifdef MASTER
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31 /*
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32 * Check to see if he is a wizard
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33 */
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34 if (argc >= 2 && argv[1][0] == '\0')
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35 if (strcmp(PASSWD, md_crypt(md_getpass("wizard's password: "), "mT")) == 0)
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36 {
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37 wizard = TRUE;
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38 player.t_flags |= SEEMONST;
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39 argv++;
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40 argc--;
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41 }
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42
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43 #endif
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44
34
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45 /* Check to see if savefiles should be stored in the system location */
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46 #ifdef SAVEDIR
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47 if (argc >= 3 && !strcmp(argv[1], "-n"))
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48 {
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49 use_savedir = TRUE;
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50 strncpy(whoami, argv[2], MAXSTR);
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51 whoami[MAXSTR-1] = '\0';
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52 snprintf(file_name, MAXSTR, "%s/%d-%.80s.r5sav", SAVEDIR,
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53 md_getuid(), whoami);
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54 }
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55 #endif
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56
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57 open_score();
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58 open_log();
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59
33
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60 /*
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61 * get home and options from environment
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62 */
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63
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64 strcpy(home, md_gethomedir());
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65
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66 if (strlen(home) > MAXSTR - strlen("rogue5.save") - 1)
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67 *home = 0;
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68
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69 if (!use_savedir)
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70 {
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71 md_normaluser();
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72 strcpy(file_name, home);
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73 strcat(file_name, "rogue5.save");
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74 }
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75
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76 if ((env = getenv("ROGUEOPTS")) != NULL)
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77 parse_opts(env);
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78 if (!use_savedir && (env == NULL || whoami[0] == '\0'))
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79 strucpy(whoami, md_getusername(), strlen(md_getusername()));
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80 lowtime = time(NULL);
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81 if (getenv("SEED") != NULL)
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82 {
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83 dnum = atoi(getenv("SEED"));
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84 noscore = 1;
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85 }
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86 else
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87 dnum = (unsigned int) lowtime + md_getpid();
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88 seed = dnum;
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89
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90 /*
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91 * check for print-score option
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92 */
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93
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94 if (argc == 2)
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95 {
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96 if (strcmp(argv[1], "-s") == 0)
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97 {
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98 noscore = TRUE;
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99 score(0, -1, 0);
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100 exit(0);
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101 }
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102 else if (strcmp(argv[1], "-d") == 0)
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103 {
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104 dnum = rnd(100); /* throw away some rnd()s to break patterns */