From 10393b170863799bbfa785410828e468c84d4937 Mon Sep 17 00:00:00 2001
From: Guido van Rossum <guido@python.org>
Date: Tue, 10 Jan 1995 10:39:49 +0000
Subject: add restrictions in restricted mode

---
 Objects/classobject.c  | 56 ++++++++++++++++++++++++++++----------------------
 Objects/funcobject.c   |  6 ++++++
 Objects/methodobject.c |  8 +++++++-
 3 files changed, 45 insertions(+), 25 deletions(-)

diff --git a/Objects/classobject.c b/Objects/classobject.c
index 48c60d4..f18b4fb 100644
--- a/Objects/classobject.c
+++ b/Objects/classobject.c
@@ -116,21 +116,28 @@ class_getattr(op, name)
 {
 	register object *v;
 	classobject *class;
-	if (strcmp(name, "__dict__") == 0) {
-		INCREF(op->cl_dict);
-		return op->cl_dict;
-	}
-	if (strcmp(name, "__bases__") == 0) {
-		INCREF(op->cl_bases);
-		return op->cl_bases;
-	}
-	if (strcmp(name, "__name__") == 0) {
-		if (op->cl_name == NULL)
-			v = None;
-		else
-			v = op->cl_name;
-		INCREF(v);
-		return v;
+	if (name[0] == '_' && name[1] == '_') {
+		if (strcmp(name, "__dict__") == 0) {
+			if (getrestricted()) {
+				err_setstr(RuntimeError,
+					   "class.__dict__ not accessible in restricted mode");
+				return NULL;
+			}
+			INCREF(op->cl_dict);
+			return op->cl_dict;
+		}
+		if (strcmp(name, "__bases__") == 0) {
+			INCREF(op->cl_bases);
+			return op->cl_bases;
+		}
+		if (strcmp(name, "__name__") == 0) {
+			if (op->cl_name == NULL)
+				v = None;
+			else
+				v = op->cl_name;
+			INCREF(v);
+			return v;
+		}
 	}
 	v = class_lookup(op, name, &class);
 	if (v == NULL) {
@@ -365,6 +372,11 @@ instance_getattr1(inst, name)
 	classobject *class;
 	if (name[0] == '_' && name[1] == '_') {
 		if (strcmp(name, "__dict__") == 0) {
+			if (getrestricted()) {
+				err_setstr(RuntimeError,
+					   "instance.__dict__ not accessible in restricted mode");
+				return NULL;
+			}
 			INCREF(inst->in_dict);
 			return inst->in_dict;
 		}
@@ -420,15 +432,6 @@ instance_getattr(inst, name)
 	res = instance_getattr1(inst, name);
 	if (res == NULL && (func = inst->in_class->cl_getattr) != NULL) {
 		object *args;
-#if 0
-		if (name[0] == '_' && name[1] == '_') {
-			int n = strlen(name);
-			if (name[n-1] == '_' && name[n-2] == '_') {
-				/* Don't mess with system attributes */
-				return NULL;
-			}
-		}
-#endif
 		err_clear();
 		args = mkvalue("(Os)", inst, name);
 		if (args == NULL)
@@ -1132,6 +1135,11 @@ instancemethod_getattr(im, name)
 	register instancemethodobject *im;
 	char *name;
 {
+	if (name[0] != '_' && getrestricted()) {
+		err_setstr(RuntimeError,
+			   "instance-method attributes not accessible in restricted mode");
+		return NULL;
+	}
 	return getmember((char *)im, instancemethod_memberlist, name);
 }
 
diff --git a/Objects/funcobject.c b/Objects/funcobject.c
index 304fb37..e2ba2a9 100644
--- a/Objects/funcobject.c
+++ b/Objects/funcobject.c
@@ -127,6 +127,7 @@ static struct memberlist func_memberlist[] = {
 	{"func_code",	T_OBJECT,	OFF(func_code),		READONLY},
 	{"func_globals",T_OBJECT,	OFF(func_globals),	READONLY},
 	{"func_name",	T_OBJECT,	OFF(func_name),		READONLY},
+	{"__name__",	T_OBJECT,	OFF(func_name),		READONLY},
 	{"func_argcount",T_INT,		OFF(func_argcount),	READONLY},
 	{"func_argdefs",T_OBJECT,	OFF(func_argdefs),	READONLY},
 	{"func_doc",	T_OBJECT,	OFF(func_doc)},
@@ -139,6 +140,11 @@ func_getattr(op, name)
 	funcobject *op;
 	char *name;
 {
+	if (name[0] != '_' && getrestricted()) {
+		err_setstr(RuntimeError,
+		  "function attributes not accessible in restricted mode");
+		return NULL;
+	}
 	return getmember((char *)op, func_memberlist, name);
 }
 
diff --git a/Objects/methodobject.c b/Objects/methodobject.c
index c33cea5..61420aa 100644
--- a/Objects/methodobject.c
+++ b/Objects/methodobject.c
@@ -107,7 +107,13 @@ meth_getattr(m, name)
 		return None;
 	}
 	if (strcmp(name, "__self__") == 0) {
-		object *self = m->m_self;
+		object *self;
+		if (getrestricted()) {
+			err_setstr(RuntimeError,
+			 "method.__self__ not accessible in restricted mode");
+			return NULL;
+		}
+		self = m->m_self;
 		if (self == NULL)
 			self = None;
 		INCREF(self);
-- 
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