X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/a0d0e21ea6ea90a22318550944fe6cb09ae10cda..717c4fccde48e6e876d5a07742c5d23716c698ef:/taint.c

diff --git a/taint.c b/taint.c
index f2e1a53..c272066 100644
--- a/taint.c
+++ b/taint.c
@@ -5,63 +5,123 @@
  */
 
 #include "EXTERN.h"
+#define PERL_IN_TAINT_C
 #include "perl.h"
 
 void
-taint_not(s)
-char *s;
+Perl_taint_proper(pTHX_ const char *f, char *s)
 {
-    if (euid != uid)
-        croak("No %s allowed while running setuid", s);
-    if (egid != gid)
-        croak("No %s allowed while running setgid", s);
-}
+    dTHR;	/* just for taint */
+    char *ug;
 
-void
-taint_proper(f, s)
-char *f;
-char *s;
-{
-    if (tainting) {
-	DEBUG_u(fprintf(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 Uid_t_SIGN == -1
+    DEBUG_u(PerlIO_printf(Perl_debug_log,
+            "%s %d %"IVdf" %"IVdf"\n", s, PL_tainted, (IV)PL_uid, (IV)PL_euid));
+#else
+    DEBUG_u(PerlIO_printf(Perl_debug_log,
+            "%s %d %"UVuf" %"UVuf"\n", s, PL_tainted, (UV)PL_uid, (UV)PL_euid));
+#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
+	    ug = " while running with -T switch";
+	if (!PL_unsafe)
+	    Perl_croak(aTHX_ f, s, ug);
+	else if (ckWARN(WARN_TAINT))
+	    Perl_warner(aTHX_ WARN_TAINT, 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 (tainting) {
-	MAGIC *mg = 0;
-	svp = hv_fetch(GvHVn(envgv),"PATH",4,FALSE);
-	if (!svp || *svp == &sv_undef || (mg = mg_find(*svp, 't'))) {
-	    tainted = 1;
-	    if (mg && MgTAINTEDDIR(mg))
-		taint_proper("Insecure directory in %s%s", "$ENV{PATH}");
-	    else
-		taint_proper("Insecure %s%s", "$ENV{PATH}");
+    if (!PL_envgv)
+	return;
+
+#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}");
 	}
-	svp = hv_fetch(GvHVn(envgv),"IFS",3,FALSE);
-	if (svp && *svp != &sv_undef && mg_find(*svp, 't')) {
-	    tainted = 1;
-	    taint_proper("Insecure %s%s", "$ENV{IFS}");
+	if ((mg = mg_find(*svp, 'e')) && MgTAINTEDDIR(mg)) {
+	    dTHR;
+	    TAINT;
+	    taint_proper("Insecure directory in %s%s", "$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 */
+	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) || *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);
+	}
+    }
+}