1 files changed, 71 insertions, 0 deletions
diff --git a/gnu/usr.bin/perl/taint.c b/gnu/usr.bin/perl/taint.c
new file mode 100644
index 00000000000..6c64b39fc77
--- /dev/null
+++ b/gnu/usr.bin/perl/taint.c
@@ -0,0 +1,71 @@
+/*
+ * "...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
+ */
+
+#include "EXTERN.h"
+#include "perl.h"
+
+void
+taint_not(s)
+char *s;
+{
+    if (euid != uid)
+        croak("No %s allowed while running setuid", s);
+    if (egid != gid)
+        croak("No %s allowed while running setgid", s);
+}
+
+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);
+	    }
+	}
+    }
+}
+
+void
+taint_env()
+{
+    SV** svp;
+
+    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}");
+	}
+	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}");
+	}
+    }
+}
+