+/* taint.c
+ *
+ * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
+ * 2002, 2003, 2004, 2005, 2006, 2007, 2008 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
+ * '...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.' --Théoden
+ *
+ * [p.580 of _The Lord of the Rings_, III/x: "The Voice of Saruman"]
+ */
+
+/* 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)
-const char *f;
-char *s;
+Perl_taint_proper(pTHX_ const char *f, const char *const s)
{
- char *ug;
+#if defined(HAS_SETEUID) && defined(DEBUGGING)
+ dVAR;
+
+ PERL_ARGS_ASSERT_TAINT_PROPER;
+
+# if Uid_t_size == 1
+ {
+ const UV uid = PL_uid;
+ const UV euid = PL_euid;
- DEBUG_u(PerlIO_printf(PerlIO_stderr(),
- "%s %d %d %d\n", s, tainted, uid, euid));
+ DEBUG_u(PerlIO_printf(Perl_debug_log,
+ "%s %d %"UVuf" %"UVuf"\n",
+ s, PL_tainted, uid, euid));
+ }
+# else
+ {
+ const IV uid = PL_uid;
+ const IV euid = PL_euid;
+
+ DEBUG_u(PerlIO_printf(Perl_debug_log,
+ "%s %d %"IVdf" %"IVdf"\n",
+ s, PL_tainted, uid, euid));
+ }
+# endif
+#endif
- if (tainted) {
- if (euid != uid)
+ if (PL_tainted) {
+ const char *ug;
+
+ if (!f)
+ f = PL_no_security;
+ if (PL_euid != PL_uid)
ug = " while running setuid";
- else if (egid != gid)
+ else if (PL_egid != PL_gid)
ug = " while running setgid";
- else
+ else if (PL_taint_warn)
+ ug = " while running with -t switch";
+ else
ug = " while running with -T switch";
- if (!unsafe)
- croak(f, s, ug);
- else if (dowarn)
- warn(f, s, ug);
+ if (PL_unsafe || PL_taint_warn) {
+ Perl_ck_warner_d(aTHX_ packWARN(WARN_TAINT), f, s, ug);
+ }
+ else {
+ Perl_croak(aTHX_ f, s, ug);
+ }
}
}
void
-taint_env()
+Perl_taint_env(pTHX)
{
+ dVAR;
SV** svp;
- MAGIC *mg;
+ MAGIC* mg;
+ const char* const *e;
+ static const char* const 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 */
+#ifdef WIN32
+ "PERL5SHELL", /* used for system() on Windows */
+#endif
+ NULL
+ };
+
+ /* 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((const SV *)GvHV(PL_envgv), PERL_MAGIC_env))) {
+ const bool was_tainted = PL_tainted;
+ const char * const name = GvENAME(PL_envgv);
+ PL_tainted = TRUE;
+ if (strEQ(name,"ENV"))
+ /* hash alias */
+ taint_proper("%%ENV is aliased to %s%s", "another variable");
+ else
+ /* 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;
+ }
#ifdef VMS
+ {
int i = 0;
char name[10 + TYPE_DIGITS(int)] = "DCL$PATH";
+ STRLEN len = 8; /* strlen(name) */
while (1) {
if (i)
- (void)sprintf(name,"DCL$PATH;%d", i);
- svp = hv_fetch(GvHVn(envgv), name, strlen(name), FALSE);
- if (!svp || *svp == &sv_undef)
+ len = my_sprintf(name,"DCL$PATH;%d", i);
+ svp = hv_fetch(GvHVn(PL_envgv), name, len, FALSE);
+ if (!svp || *svp == &PL_sv_undef)
break;
if (SvTAINTED(*svp)) {
TAINT;
taint_proper("Insecure %s%s", "$ENV{DCL$PATH}");
}
- if ((mg = mg_find(*svp, 'e')) && MgTAINTEDDIR(mg)) {
+ if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) {
TAINT;
taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}");
}
i++;
}
+ }
#endif /* VMS */
- svp = hv_fetch(GvHVn(envgv),"PATH",4,FALSE);
+ svp = hv_fetchs(GvHVn(PL_envgv),"PATH",FALSE);
if (svp && *svp) {
if (SvTAINTED(*svp)) {
TAINT;
taint_proper("Insecure %s%s", "$ENV{PATH}");
}
- if ((mg = mg_find(*svp, 'e')) && MgTAINTEDDIR(mg)) {
+ if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) {
TAINT;
taint_proper("Insecure directory in %s%s", "$ENV{PATH}");
}
}
- svp = hv_fetch(GvHVn(envgv),"IFS",3,FALSE);
- if (svp && *svp != &sv_undef && SvTAINTED(*svp)) {
- TAINT;
- taint_proper("Insecure %s%s", "$ENV{IFS}");
+#ifndef VMS
+ /* tainted $TERM is okay if it contains no metachars */
+ svp = hv_fetchs(GvHVn(PL_envgv),"TERM",FALSE);
+ if (svp && *svp && SvTAINTED(*svp)) {
+ STRLEN len;
+ const bool was_tainted = PL_tainted;
+ const char *t = SvPV_const(*svp, len);
+ const char * const e = t + len;
+ 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++) {
+ SV * const * const 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);
+ }
}
}
+
+/*
+ * Local variables:
+ * c-indentation-style: bsd
+ * c-basic-offset: 4
+ * indent-tabs-mode: t
+ * End:
+ *
+ * ex: set ts=8 sts=4 sw=4 noet:
+ */
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