+/* 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
*/
#include "EXTERN.h"
+#define PERL_IN_TAINT_C
#include "perl.h"
void
-taint_not(s)
-char *s;
+Perl_taint_proper(pTHX_ const char *f, const char *s)
{
- if (euid != uid)
- croak("No %s allowed while running setuid", s);
- if (egid != gid)
- croak("No %s allowed while running setgid", s);
-}
+ char *ug;
-void
-taint_proper(f, s)
-char *f;
-char *s;
-{
- if (tainting) {
- DEBUG_u(PerlIO_printf(PerlIO_stderr(), "%s %d %d %d\n",s,tainted,uid, euid));
- if (tainted) {
- char *ug = 0;
- if (euid != uid)
- ug = " while running setuid";
- else if (egid != gid)
- ug = " while running setgid";
- else if (tainting)
- ug = " while running with -T switch";
- if (ug) {
- if (!unsafe)
- croak(f, s, ug);
- else if (dowarn)
- warn(f, s, 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
+ };
+
+ if (!PL_envgv)
+ return;
- if (tainting) {
- MAGIC *mg = 0;
- svp = hv_fetch(GvHVn(envgv),"PATH",4,FALSE);
- if (!svp || *svp == &sv_undef ||
- ((mg = mg_find(*svp, 't')) && mg->mg_len & 1))
- {
- tainted = TRUE;
- if (mg && MgTAINTEDDIR(mg))
- taint_proper("Insecure directory in %s%s", "$ENV{PATH}");
- else
- taint_proper("Insecure %s%s", "$ENV{PATH}");
+#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}");
}
- svp = hv_fetch(GvHVn(envgv),"IFS",3,FALSE);
- if (svp && *svp != &sv_undef &&
- (mg = mg_find(*svp, 't')) && mg->mg_len & 1)
- {
- tainted = TRUE;
- taint_proper("Insecure %s%s", "$ENV{IFS}");
+ if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) {
+ TAINT;
+ taint_proper("Insecure directory in %s%s", "$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);
+ }
+ }
+}