+/* 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
+ */
+
+/* This file contains a few functions for handling data tainting in Perl
+ */
+
+#include "EXTERN.h"
+#define PERL_IN_TAINT_C
+#include "perl.h"
+
void
-taint_proper(f, s)
-char *f;
-char *s;
+Perl_taint_proper(pTHX_ const char *f, const char *s)
{
- DEBUG_u(fprintf(stderr,"%s %d %d %d\n",s,tainted,uid, euid));
- if (tainted && (!euid || euid != uid || egid != gid || taintanyway)) {
- if (!unsafe)
- fatal(f, s);
- else if (dowarn)
- warn(f, 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
-taint_env()
+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
+ };
- svp = hv_fetch(GvHVn(envgv),"PATH",4,FALSE);
- if (!svp || *svp == &sv_undef || (*svp)->sv_tainted) {
- tainted = 1;
- if ((*svp)->sv_tainted == 2)
- taint_proper("Insecure directory in %s", "PATH");
+ /* 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
- taint_proper("Insecure %s", "PATH");
+ /* 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;
}
- svp = hv_fetch(GvHVn(envgv),"IFS",3,FALSE);
- if (svp && *svp != &sv_undef && (*svp)->sv_tainted) {
- tainted = 1;
- taint_proper("Insecure %s", "IFS");
+
+#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);
+ }
+ }
+}