[Autofill] Sanitize all data that comes in over IPC.

components/autofill/core/common/autofill_data_validation.cc

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/autofill/core/common/autofill_data_validation.h"
+
+#include "components/autofill/core/common/form_data.h"
+#include "components/autofill/core/common/form_field_data.h"
+#include "components/autofill/core/common/password_form_fill_data.h"
+#include "url/gurl.h"
+
+namespace autofill {
+
+const size_t kMaxDataLength = 1024;
+
+// Allow enough space for all countries (roughly 300 distinct values) and all
+// timezones (roughly 400 distinct values), plus some extra wiggle room.
+const size_t kMaxListSize = 512;
+
+bool IsValidString(const std::string& str) {
+  return str.size() <= kMaxDataLength;
+}
+
+bool IsValidString16(const base::string16& str) {
+  return str.size() <= kMaxDataLength;
+}
+
+bool IsValidGURL(const GURL& url) {
+  return url.is_empty() || url.is_valid();
+}
+
+bool IsValidFormFieldData(const FormFieldData& field) {
+  return
+      IsValidString16(field.label) &&
+      IsValidString16(field.name) &&
+      IsValidString16(field.value) &&
+      IsValidString(field.form_control_type) &&
+      IsValidString(field.autocomplete_attribute) &&
+      IsValidString16Vector(field.option_values) &&
+      IsValidString16Vector(field.option_contents);
+}
+
+bool IsValidFormData(const FormData& form) {
+  if (!IsValidString16(form.name) ||
+      !IsValidString16(form.method) ||
+      !IsValidGURL(form.origin) ||
+      !IsValidGURL(form.action))
+    return false;
+
+  if (form.fields.size() > kMaxListSize)
+    return false;
+
+  for (std::vector<FormFieldData>::const_iterator it = form.fields.begin();
+       it != form.fields.end(); ++it) {
+    if (!IsValidFormFieldData(*it))
+      return false;
+  }
+
+  return true;
+}
+
+bool IsValidPasswordFormFillData(const PasswordFormFillData& form) {
+  if (!IsValidFormData(form.basic_data) ||
+      !IsValidString(form.preferred_realm))
+    return false;
+
+  for (PasswordFormFillData::LoginCollection::const_iterator it =
+           form.additional_logins.begin();
+       it != form.additional_logins.end(); ++it) {
+    if (!IsValidString16(it->first) ||
+        !IsValidString16(it->second.password) ||
+        !IsValidString(it->second.realm))
+      return false;
+  }
+
+  for (PasswordFormFillData::UsernamesCollection::const_iterator it =
+           form.other_possible_usernames.begin();
+       it != form.other_possible_usernames.end(); ++it) {
+    if (!IsValidString16(it->first.username) ||
+        !IsValidString16(it->first.password) ||
+        !IsValidString(it->first.realm) ||
+        !IsValidString16Vector(it->second))
+      return false;
+  }
+
+  return true;
+}
+
+bool IsValidString16Vector(const std::vector<base::string16>& v) {
+  if (v.size() > kMaxListSize)
+    return false;
+
+  for (std::vector<base::string16>::const_iterator it = v.begin();
+       it != v.end(); ++it) {
+    if (!IsValidString16(*it))
+      return false;
+  }
+
+  return true;
+}
+
+bool IsValidFormDataVector(const std::vector<FormData>& v) {
+  if (v.size() > kMaxListSize)
+    return false;
+
+  for (std::vector<FormData>::const_iterator it = v.begin(); it != v.end();
+       ++it) {
+    if (!IsValidFormData(*it))
+      return false;
+  }
+
+  return true;
+}
+
+}  // namespace autofill