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Instead of swapping ruid and euid before and after touching user's file,

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simply drop the privilege right after the program is started.
Thanks to bde for giving me good suggestion about this problem.
This commit is contained in:
Masafumi Max NAKANE 1997-02-01 21:30:50 +00:00
parent 93f303ace3
commit 10c4031d64
3 changed files with 12 additions and 4 deletions
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5
games/backgammon/backgammon/main.c
View File

@ -104,6 +104,11 @@ char **argv;
register int l; /* non-descript index */
register char c; /* non-descript character storage */
long t; /* time for random num generator */
uid_t uid;
/*Drop the privilege.*/
uid = getuid();
setreuid (uid,uid);
/* initialization */
bflag = 2; /* default no board */

4
games/backgammon/common_source/save.c
View File

@ -87,7 +87,6 @@ register int n;
writec (*fs++);
}
*fs = '\0';
setreuid(geteuid(), getuid());
if ((fdesc = open(fname,2)) == -1 && errno == 2) {
if ((fdesc = creat (fname,0700)) != -1)
break;
@ -130,7 +129,6 @@ register int n;
write (fdesc,&gvalue,sizeof gvalue);
write (fdesc,&raflag,sizeof raflag);
close (fdesc);
setreuid(geteuid(), getuid());
if (tflag)
curmove (18,0);
writel (saved);
@ -150,7 +148,6 @@ char *s;
register int i;
int fdesc;
setreuid(geteuid(), getuid());
if ((fdesc = open (s,0)) == -1)
norec (s);
read (fdesc,board,sizeof board);
@ -165,7 +162,6 @@ char *s;
read (fdesc,&gvalue,sizeof gvalue);
read (fdesc,&raflag,sizeof raflag);
close (fdesc);
setreuid(geteuid(), getuid());
rflag = 1;
}

7
games/backgammon/teachgammon/teach.c
View File

@ -42,6 +42,8 @@ static char sccsid[] = "@(#)teach.c 8.1 (Berkeley) 5/31/93";
#endif /* not lint */
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include "back.h"
char *hello[];
@ -78,6 +80,11 @@ char **argv;
{
register int i;
uid_t uid;
/*Drop the privilege.*/
uid = getuid();
setreuid (uid,uid);
acnt = 1;
signal (2,getout);