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