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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(const char *f, char *s)
{
dTHR; /* just for taint */
char *ug;
DEBUG_u(PerlIO_printf(Perl_debug_log,
"%s %d %d %d\n", s, PL_tainted, PL_uid, PL_euid));
if (PL_tainted) {
if (PL_euid != PL_uid)
ug = " while running setuid";
else if (PL_egid != PL_gid)
ug = " while running setgid";
else
ug = " while running with -T switch";
if (!PL_unsafe)
croak(f, s, ug);
else if (PL_dowarn)
warn(f, s, ug);
}
}
void
taint_env(void)
{
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(PL_envgv), name, strlen(name), FALSE);
if (!svp || *svp == &PL_sv_undef)
break;
if (SvTAINTED(*svp)) {
dTHR;
TAINT;
taint_proper("Insecure %s%s", "$ENV{DCL$PATH}");
}
if ((mg = mg_find(*svp, 'e')) && MgTAINTEDDIR(mg)) {
dTHR;
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)) {
dTHR;
TAINT;
taint_proper("Insecure %s%s", "$ENV{PATH}");
}
if ((mg = mg_find(*svp, 'e')) && MgTAINTEDDIR(mg)) {
dTHR;
TAINT;
taint_proper("Insecure directory in %s%s", "$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)) {
dTHR; /* just for taint */
bool was_tainted = PL_tainted;
char *t = SvPV(*svp, PL_na);
char *e = t + PL_na;
PL_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(PL_envgv), *e, strlen(*e), FALSE);
if (svp && *svp != &PL_sv_undef && SvTAINTED(*svp)) {
dTHR; /* just for taint */
TAINT;
taint_proper("Insecure $ENV{%s}%s", *e);
}
}
}
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