Robots has a nicely implemented score file, so I decided not to touch it, except for moving to $HOME by default. Needs pledge("getpw") because of that.
Index: robots/main.c =================================================================== RCS file: /cvs/src/games/robots/main.c,v retrieving revision 1.20 diff -u -p -r1.20 main.c --- robots/main.c 26 Aug 2015 00:29:24 -0000 1.20 +++ robots/main.c 29 Nov 2015 13:39:57 -0000 @@ -43,22 +43,31 @@ int main(int ac, char *av[]) { bool show_only; - extern char *Scorefile; + extern char Scorefile[PATH_MAX]; int score_wfd; /* high score writable file descriptor */ int score_err = 0; /* hold errno from score file open */ int ch; + int ret; extern int optind; - gid_t gid; + char *home; #ifdef FANCY char *sp; #endif - if ((score_wfd = open(Scorefile, O_RDWR)) < 0) - score_err = errno; + if (pledge("stdio rpath wpath cpath getpw tty", NULL) == -1) + err(1, "pledge"); + + home = getenv("HOME"); + if (home == NULL || *home == '\0') + err(1, "getenv"); - /* revoke privs */ - gid = getgid(); - setresgid(gid, gid, gid); + ret = snprintf(Scorefile, sizeof(Scorefile), "%s/%s", home, + ".robots.scores"); + if (ret < 0 || ret >= PATH_MAX) + errc(1, ENAMETOOLONG, "%s/%s", home, ".robots.scores"); + + if ((score_wfd = open(Scorefile, O_RDWR | O_CREAT, 0666)) < 0) + score_err = errno; show_only = FALSE; while ((ch = getopt(ac, av, "srajt")) != -1) @@ -90,11 +99,11 @@ main(int ac, char *av[]) if (ac > 1) usage(); if (ac == 1) { - Scorefile = av[0]; + strlcpy(Scorefile, av[0], sizeof(Scorefile)); if (score_wfd >= 0) close(score_wfd); /* This file requires no special privileges. */ - if ((score_wfd = open(Scorefile, O_RDWR)) < 0) + if ((score_wfd = open(Scorefile, O_RDWR | O_CREAT, 0666)) < 0) score_err = errno; #ifdef FANCY sp = strrchr(Scorefile, '/'); Index: robots/pathnames.h =================================================================== RCS file: robots/pathnames.h diff -N robots/pathnames.h --- robots/pathnames.h 3 Jun 2003 03:01:41 -0000 1.3 +++ /dev/null 1 Jan 1970 00:00:00 -0000 @@ -1,35 +0,0 @@ -/* $OpenBSD: pathnames.h,v 1.3 2003/06/03 03:01:41 millert Exp $ */ -/* $NetBSD: pathnames.h,v 1.3 1995/04/22 10:09:01 cgd Exp $ */ - -/*- - * Copyright (c) 1990, 1993 - * The Regents of the University of California. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * @(#)pathnames.h 8.1 (Berkeley) 5/31/93 - */ - -#define _PATH_SCORE "/var/games/robots_roll" Index: robots/robots.6 =================================================================== RCS file: /cvs/src/games/robots/robots.6,v retrieving revision 1.13 diff -u -p -r1.13 robots.6 --- robots/robots.6 8 Sep 2014 01:27:54 -0000 1.13 +++ robots/robots.6 29 Nov 2015 13:39:57 -0000 @@ -137,8 +137,8 @@ This is a little disconcerting until you very nice. .El .Sh FILES -.Bl -tag -width /var/games/robots_roll -compact -.It Pa /var/games/robots_roll +.Bl -tag -width $HOME/.robots.scores -compact +.It Pa $HOME/.robots.scores the score file .El .Sh AUTHORS Index: robots/robots.h =================================================================== RCS file: /cvs/src/games/robots/robots.h,v retrieving revision 1.9 diff -u -p -r1.9 robots.h --- robots/robots.h 26 Aug 2015 00:29:24 -0000 1.9 +++ robots/robots.h 29 Nov 2015 13:39:57 -0000 @@ -88,8 +88,6 @@ typedef struct { char s_name[LOGIN_NAME_MAX]; } SCORE; -typedef struct passwd PASSWD; - /* * global variables */ Index: robots/score.c =================================================================== RCS file: /cvs/src/games/robots/score.c,v retrieving revision 1.11 diff -u -p -r1.11 score.c --- robots/score.c 16 Nov 2014 04:49:48 -0000 1.11 +++ robots/score.c 29 Nov 2015 13:39:57 -0000 @@ -33,7 +33,7 @@ #include "robots.h" #include "pathnames.h" -char *Scorefile = _PATH_SCORE; +char Scorefile[PATH_MAX]; #ifndef MAX_PER_UID #define MAX_PER_UID 5 @@ -130,7 +130,7 @@ score(int score_wfd) void set_name(SCORE *scp) { - PASSWD *pp; + struct passwd *pp; if ((pp = getpwuid(scp->s_uid)) == NULL) pp->pw_name = "???";