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/*
* "...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"
#include "perl.h"
void
taint_proper(f, s)
const char *f;
char *s;
{
char *ug;
DEBUG_u(PerlIO_printf(Perl_debug_log,
"%s %d %d %d\n", s, tainted, uid, euid));
if (tainted) {
if (euid != uid)
ug = " while running setuid";
else if (egid != gid)
ug = " while running setgid";
else
ug = " while running with -T switch";
if (!unsafe)
croak(f, s, ug);
else if (dowarn)
warn(f, s, ug);
}
}
void
taint_env()
{
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
};
#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(envgv), name, strlen(name), FALSE);
if (!svp || *svp == &sv_undef)
break;
if (SvTAINTED(*svp)) {
TAINT;
taint_proper("Insecure %s%s", "$ENV{DCL$PATH}");
}
if ((mg = mg_find(*svp, 'e')) && MgTAINTEDDIR(mg)) {
TAINT;
taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}");
}
i++;
}
#endif /* VMS */
svp = hv_fetch(GvHVn(envgv),"PATH",4,FALSE);
if (svp && *svp) {
if (SvTAINTED(*svp)) {
TAINT;
taint_proper("Insecure %s%s", "$ENV{PATH}");
}
if ((mg = mg_find(*svp, 'e')) && MgTAINTEDDIR(mg)) {
TAINT;
taint_proper("Insecure directory in %s%s", "$ENV{PATH}");
}
}
#ifndef VMS
/* tainted $TERM is okay if it contains no metachars */
svp = hv_fetch(GvHVn(envgv),"TERM",4,FALSE);
if (svp && *svp && SvTAINTED(*svp)) {
bool was_tainted = tainted;
char *t = SvPV(*svp, na);
char *e = t + na;
tainted = was_tainted;
if (t < e && isALNUM(*t))
t++;
while (t < e && (isALNUM(*t) || *t == '-' || *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(envgv), *e, strlen(*e), FALSE);
if (svp && *svp != &sv_undef && SvTAINTED(*svp)) {
TAINT;
taint_proper("Insecure $ENV{%s}%s", *e);
}
}
}
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