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Never allow a user to use crontab if opening /var/cron/{allow,deny} fails

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for any reason other than ENOENT (think resource limits). Close allow and
deny files before allowed() returns to stop the user's EDITOR being able to
read them.

Obtained from:	OpenBSD (partially)
This commit is contained in:
Tim J. Robbins 2002-08-04 04:32:27 +00:00
parent 10bc1114ce
commit 526b145c23
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=101293
1 changed files with 23 additions and 16 deletions
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39
usr.sbin/cron/lib/misc.c
View File

@ -410,31 +410,38 @@ int
allowed(username)
char *username;
{
static int init = FALSE;
static FILE *allow, *deny;
FILE *allow, *deny;
int isallowed;
isallowed = FALSE;
if (!init) {
init = TRUE;
#if defined(ALLOW_FILE) && defined(DENY_FILE)
allow = fopen(ALLOW_FILE, "r");
deny = fopen(DENY_FILE, "r");
Debug(DMISC, ("allow/deny enabled, %d/%d\n", !!allow, !!deny))
if ((allow = fopen(ALLOW_FILE, "r")) == NULL && errno != ENOENT)
goto out;
if ((deny = fopen(DENY_FILE, "r")) == NULL && errno != ENOENT)
goto out;
Debug(DMISC, ("allow/deny enabled, %d/%d\n", !!allow, !!deny))
#else
allow = NULL;
deny = NULL;
allow = NULL;
deny = NULL;
#endif
}
if (allow)
return (in_file(username, allow));
if (deny)
return (!in_file(username, deny));
isallowed = in_file(username, allow);
else if (deny)
isallowed = !in_file(username, deny);
else {
#if defined(ALLOW_ONLY_ROOT)
return (strcmp(username, ROOT_USER) == 0);
isallowed = (strcmp(username, ROOT_USER) == 0);
#else
return TRUE;
isallowed = TRUE;
#endif
}
out: if (allow)
fclose(allow);
if (deny)
fclose(deny);
return (isallowed);
}