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/* taint.c
*
* Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999,
* 2000, 2001, 2002, by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* "...we will have peace, when you and all your works have perished--and
* the works of your dark master to whom you would deliver us. You are a
* liar, Saruman, and a corrupter of men's hearts." --Theoden
*/
#include "EXTERN.h"
#define PERL_IN_TAINT_C
#include "perl.h"
void
Perl_taint_proper(pTHX_ const char *f, const char *s)
{
char *ug;
#if defined(HAS_SETEUID) && defined(DEBUGGING)
# if Uid_t_size == 1
{
UV uid = PL_uid;
UV euid = PL_euid;
DEBUG_u(PerlIO_printf(Perl_debug_log,
"%s %d %"UVuf" %"UVuf"\n",
s, PL_tainted, uid, euid));
}
# else
{
IV uid = PL_uid;
IV euid = PL_euid;
DEBUG_u(PerlIO_printf(Perl_debug_log,
"%s %d %"IVdf" %"IVdf"\n",
s, PL_tainted, uid, euid));
}
# endif
#endif
if (PL_tainted) {
if (!f)
f = PL_no_security;
if (PL_euid != PL_uid)
ug = " while running setuid";
else if (PL_egid != PL_gid)
ug = " while running setgid";
else if (PL_taint_warn)
ug = " while running with -t switch";
else
ug = " while running with -T switch";
if (PL_unsafe || PL_taint_warn) {
if(ckWARN(WARN_TAINT))
Perl_warner(aTHX_ packWARN(WARN_TAINT), f, s, ug);
}
else {
Perl_croak(aTHX_ f, s, ug);
}
}
}
void
Perl_taint_env(pTHX)
{
SV** svp;
MAGIC* mg;
char** e;
static char* misc_env[] = {
"IFS", /* most shells' inter-field separators */
"CDPATH", /* ksh dain bramage #1 */
"ENV", /* ksh dain bramage #2 */
"BASH_ENV", /* bash dain bramage -- I guess it's contagious */
NULL
};
/* Don't bother if there's no *ENV glob */
if (!PL_envgv)
return;
/* If there's no %ENV hash of if it's not magical, croak, because
* it probably doesn't reflect the actual environment */
if (!GvHV(PL_envgv) || !(SvRMAGICAL(GvHV(PL_envgv))
&& mg_find((SV*)GvHV(PL_envgv), PERL_MAGIC_env))) {
bool was_tainted = PL_tainted;
char *name = GvENAME(PL_envgv);
PL_tainted = TRUE;
if (strEQ(name,"ENV"))
/* hash alias */
taint_proper("%%ENV is aliased to %s%s", "another variable");
else
/* glob alias: report it in the error message */
taint_proper("%%ENV is aliased to %%%s%s", name);
/* this statement is reached under -t or -U */
PL_tainted = was_tainted;
}
#ifdef VMS
{
int i = 0;
char name[10 + TYPE_DIGITS(int)] = "DCL$PATH";
while (1) {
if (i)
(void)sprintf(name,"DCL$PATH;%d", i);
svp = hv_fetch(GvHVn(PL_envgv), name, strlen(name), FALSE);
if (!svp || *svp == &PL_sv_undef)
break;
if (SvTAINTED(*svp)) {
TAINT;
taint_proper("Insecure %s%s", "$ENV{DCL$PATH}");
}
if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) {
TAINT;
taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}");
}
i++;
}
}
#endif /* VMS */
svp = hv_fetch(GvHVn(PL_envgv),"PATH",4,FALSE);
if (svp && *svp) {
if (SvTAINTED(*svp)) {
TAINT;
taint_proper("Insecure %s%s", "$ENV{PATH}");
}
if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) {
TAINT;
taint_proper("Insecure directory in %s%s", "$ENV{PATH}");
}
}
#ifndef VMS
/* tainted $TERM is okay if it contains no metachars */
svp = hv_fetch(GvHVn(PL_envgv),"TERM",4,FALSE);
if (svp && *svp && SvTAINTED(*svp)) {
STRLEN n_a;
bool was_tainted = PL_tainted;
char *t = SvPV(*svp, n_a);
char *e = t + n_a;
PL_tainted = was_tainted;
if (t < e && isALNUM(*t))
t++;
while (t < e && (isALNUM(*t) || strchr("-_.+", *t)))
t++;
if (t < e) {
TAINT;
taint_proper("Insecure $ENV{%s}%s", "TERM");
}
}
#endif /* !VMS */
for (e = misc_env; *e; e++) {
svp = hv_fetch(GvHVn(PL_envgv), *e, strlen(*e), FALSE);
if (svp && *svp != &PL_sv_undef && SvTAINTED(*svp)) {
TAINT;
taint_proper("Insecure $ENV{%s}%s", *e);
}
}
}
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