/*
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* Copyright 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* FirewallControllerTest.cpp - unit tests for FirewallController.cpp
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*/
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#include <string>
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#include <vector>
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#include <stdio.h>
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#include <gtest/gtest.h>
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#include <android-base/file.h>
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#include <android-base/stringprintf.h>
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#include <android-base/strings.h>
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#include "FirewallController.h"
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#include "IptablesBaseTest.h"
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using android::base::Join;
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using android::base::WriteStringToFile;
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namespace android {
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namespace net {
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class FirewallControllerTest : public IptablesBaseTest {
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protected:
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FirewallControllerTest() {
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FirewallController::execIptablesRestore = fakeExecIptablesRestore;
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// This unit test currently doesn't cover the eBPF owner match case so
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// we have to manually turn eBPF support off.
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// TODO: find a way to unit test the eBPF code path.
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mFw.mUseBpfOwnerMatch = android::bpf::BpfLevel::NONE;
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}
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FirewallController mFw;
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std::string makeUidRules(IptablesTarget a, const char* b, bool c,
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const std::vector<int32_t>& d) {
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return mFw.makeUidRules(a, b, c, d);
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}
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int createChain(const char* a, FirewallType b) {
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return mFw.createChain(a, b);
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}
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};
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TEST_F(FirewallControllerTest, TestCreateWhitelistChain) {
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std::vector<std::string> expectedRestore4 = {
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"*filter",
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":fw_whitelist -",
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"-A fw_whitelist -m owner --uid-owner 0-9999 -j RETURN",
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"-A fw_whitelist -m owner ! --uid-owner 0-4294967294 -j RETURN",
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"-A fw_whitelist -p esp -j RETURN",
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"-A fw_whitelist -i lo -j RETURN",
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"-A fw_whitelist -o lo -j RETURN",
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"-A fw_whitelist -p tcp --tcp-flags RST RST -j RETURN",
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"-A fw_whitelist -j DROP",
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"COMMIT\n"
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};
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std::vector<std::string> expectedRestore6 = {
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"*filter",
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":fw_whitelist -",
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"-A fw_whitelist -m owner --uid-owner 0-9999 -j RETURN",
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"-A fw_whitelist -m owner ! --uid-owner 0-4294967294 -j RETURN",
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"-A fw_whitelist -p esp -j RETURN",
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"-A fw_whitelist -i lo -j RETURN",
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"-A fw_whitelist -o lo -j RETURN",
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"-A fw_whitelist -p tcp --tcp-flags RST RST -j RETURN",
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"-A fw_whitelist -p icmpv6 --icmpv6-type packet-too-big -j RETURN",
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"-A fw_whitelist -p icmpv6 --icmpv6-type router-solicitation -j RETURN",
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"-A fw_whitelist -p icmpv6 --icmpv6-type router-advertisement -j RETURN",
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"-A fw_whitelist -p icmpv6 --icmpv6-type neighbour-solicitation -j RETURN",
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"-A fw_whitelist -p icmpv6 --icmpv6-type neighbour-advertisement -j RETURN",
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"-A fw_whitelist -p icmpv6 --icmpv6-type redirect -j RETURN",
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"-A fw_whitelist -j DROP",
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"COMMIT\n"
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};
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std::vector<std::pair<IptablesTarget, std::string>> expectedRestoreCommands = {
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{V4, Join(expectedRestore4, '\n')},
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{V6, Join(expectedRestore6, '\n')},
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};
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createChain("fw_whitelist", WHITELIST);
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expectIptablesRestoreCommands(expectedRestoreCommands);
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}
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TEST_F(FirewallControllerTest, TestCreateBlacklistChain) {
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std::vector<std::string> expectedRestore = {
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"*filter",
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":fw_blacklist -",
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"-A fw_blacklist -i lo -j RETURN",
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"-A fw_blacklist -o lo -j RETURN",
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"-A fw_blacklist -p tcp --tcp-flags RST RST -j RETURN",
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"COMMIT\n"
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};
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std::vector<std::pair<IptablesTarget, std::string>> expectedRestoreCommands = {
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{V4, Join(expectedRestore, '\n')},
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{V6, Join(expectedRestore, '\n')},
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};
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createChain("fw_blacklist", BLACKLIST);
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expectIptablesRestoreCommands(expectedRestoreCommands);
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}
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TEST_F(FirewallControllerTest, TestSetStandbyRule) {
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ExpectedIptablesCommands expected = {
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{ V4V6, "*filter\n-D fw_standby -m owner --uid-owner 12345 -j DROP\nCOMMIT\n" }
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};
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mFw.setUidRule(STANDBY, 12345, ALLOW);
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expectIptablesRestoreCommands(expected);
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expected = {
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{ V4V6, "*filter\n-A fw_standby -m owner --uid-owner 12345 -j DROP\nCOMMIT\n" }
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};
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mFw.setUidRule(STANDBY, 12345, DENY);
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expectIptablesRestoreCommands(expected);
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}
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TEST_F(FirewallControllerTest, TestSetDozeRule) {
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ExpectedIptablesCommands expected = {
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{ V4V6, "*filter\n-I fw_dozable -m owner --uid-owner 54321 -j RETURN\nCOMMIT\n" }
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};
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mFw.setUidRule(DOZABLE, 54321, ALLOW);
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expectIptablesRestoreCommands(expected);
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expected = {
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{ V4V6, "*filter\n-D fw_dozable -m owner --uid-owner 54321 -j RETURN\nCOMMIT\n" }
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};
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mFw.setUidRule(DOZABLE, 54321, DENY);
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expectIptablesRestoreCommands(expected);
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}
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TEST_F(FirewallControllerTest, TestSetFirewallRule) {
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ExpectedIptablesCommands expected = {
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{ V4V6, "*filter\n"
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"-A fw_INPUT -m owner --uid-owner 54321 -j DROP\n"
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"-A fw_OUTPUT -m owner --uid-owner 54321 -j DROP\n"
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"COMMIT\n" }
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};
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mFw.setUidRule(NONE, 54321, DENY);
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expectIptablesRestoreCommands(expected);
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expected = {
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{ V4V6, "*filter\n"
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"-D fw_INPUT -m owner --uid-owner 54321 -j DROP\n"
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"-D fw_OUTPUT -m owner --uid-owner 54321 -j DROP\n"
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"COMMIT\n" }
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};
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mFw.setUidRule(NONE, 54321, ALLOW);
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expectIptablesRestoreCommands(expected);
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}
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TEST_F(FirewallControllerTest, TestReplaceWhitelistUidRule) {
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std::string expected =
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"*filter\n"
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":FW_whitechain -\n"
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"-A FW_whitechain -m owner --uid-owner 10023 -j RETURN\n"
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"-A FW_whitechain -m owner --uid-owner 10059 -j RETURN\n"
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"-A FW_whitechain -m owner --uid-owner 10124 -j RETURN\n"
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"-A FW_whitechain -m owner --uid-owner 10111 -j RETURN\n"
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"-A FW_whitechain -m owner --uid-owner 110122 -j RETURN\n"
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"-A FW_whitechain -m owner --uid-owner 210153 -j RETURN\n"
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"-A FW_whitechain -m owner --uid-owner 210024 -j RETURN\n"
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"-A FW_whitechain -m owner --uid-owner 0-9999 -j RETURN\n"
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"-A FW_whitechain -m owner ! --uid-owner 0-4294967294 -j RETURN\n"
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"-A FW_whitechain -p esp -j RETURN\n"
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"-A FW_whitechain -i lo -j RETURN\n"
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"-A FW_whitechain -o lo -j RETURN\n"
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"-A FW_whitechain -p tcp --tcp-flags RST RST -j RETURN\n"
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"-A FW_whitechain -p icmpv6 --icmpv6-type packet-too-big -j RETURN\n"
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"-A FW_whitechain -p icmpv6 --icmpv6-type router-solicitation -j RETURN\n"
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"-A FW_whitechain -p icmpv6 --icmpv6-type router-advertisement -j RETURN\n"
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"-A FW_whitechain -p icmpv6 --icmpv6-type neighbour-solicitation -j RETURN\n"
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"-A FW_whitechain -p icmpv6 --icmpv6-type neighbour-advertisement -j RETURN\n"
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"-A FW_whitechain -p icmpv6 --icmpv6-type redirect -j RETURN\n"
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"-A FW_whitechain -j DROP\n"
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"COMMIT\n";
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std::vector<int32_t> uids = { 10023, 10059, 10124, 10111, 110122, 210153, 210024 };
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EXPECT_EQ(expected, makeUidRules(V6, "FW_whitechain", true, uids));
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}
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TEST_F(FirewallControllerTest, TestReplaceBlacklistUidRule) {
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std::string expected =
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"*filter\n"
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":FW_blackchain -\n"
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"-A FW_blackchain -i lo -j RETURN\n"
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"-A FW_blackchain -o lo -j RETURN\n"
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"-A FW_blackchain -p tcp --tcp-flags RST RST -j RETURN\n"
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"-A FW_blackchain -m owner --uid-owner 10023 -j DROP\n"
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"-A FW_blackchain -m owner --uid-owner 10059 -j DROP\n"
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"-A FW_blackchain -m owner --uid-owner 10124 -j DROP\n"
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"COMMIT\n";
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std::vector<int32_t> uids = { 10023, 10059, 10124 };
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EXPECT_EQ(expected, makeUidRules(V4 ,"FW_blackchain", false, uids));
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}
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TEST_F(FirewallControllerTest, TestEnableChildChains) {
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std::vector<std::string> expected = {
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"*filter\n"
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"-A fw_INPUT -j fw_dozable\n"
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"-A fw_OUTPUT -j fw_dozable\n"
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"COMMIT\n"
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};
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EXPECT_EQ(0, mFw.enableChildChains(DOZABLE, true));
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expectIptablesRestoreCommands(expected);
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expected = {
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"*filter\n"
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"-D fw_INPUT -j fw_powersave\n"
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"-D fw_OUTPUT -j fw_powersave\n"
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"COMMIT\n"
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};
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EXPECT_EQ(0, mFw.enableChildChains(POWERSAVE, false));
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expectIptablesRestoreCommands(expected);
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}
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TEST_F(FirewallControllerTest, TestFirewall) {
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std::vector<std::string> enableCommands = {
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"*filter\n"
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"-A fw_INPUT -j DROP\n"
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"-A fw_OUTPUT -j REJECT\n"
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"-A fw_FORWARD -j REJECT\n"
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"COMMIT\n"
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};
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std::vector<std::string> disableCommands = {
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"*filter\n"
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":fw_INPUT -\n"
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":fw_OUTPUT -\n"
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":fw_FORWARD -\n"
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"COMMIT\n"
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};
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std::vector<std::string> noCommands = {};
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EXPECT_EQ(0, mFw.resetFirewall());
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expectIptablesRestoreCommands(disableCommands);
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EXPECT_EQ(0, mFw.resetFirewall());
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expectIptablesRestoreCommands(disableCommands);
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EXPECT_EQ(0, mFw.setFirewallType(BLACKLIST));
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expectIptablesRestoreCommands(disableCommands);
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EXPECT_EQ(0, mFw.setFirewallType(BLACKLIST));
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expectIptablesRestoreCommands(noCommands);
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std::vector<std::string> disableEnableCommands;
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disableEnableCommands.insert(
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disableEnableCommands.end(), disableCommands.begin(), disableCommands.end());
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disableEnableCommands.insert(
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disableEnableCommands.end(), enableCommands.begin(), enableCommands.end());
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EXPECT_EQ(0, mFw.setFirewallType(WHITELIST));
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expectIptablesRestoreCommands(disableEnableCommands);
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std::vector<std::string> ifaceCommands = {
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"*filter\n"
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"-I fw_INPUT -i rmnet_data0 -j RETURN\n"
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"-I fw_OUTPUT -o rmnet_data0 -j RETURN\n"
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"COMMIT\n"
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};
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EXPECT_EQ(0, mFw.setInterfaceRule("rmnet_data0", ALLOW));
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expectIptablesRestoreCommands(ifaceCommands);
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EXPECT_EQ(0, mFw.setInterfaceRule("rmnet_data0", ALLOW));
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expectIptablesRestoreCommands(noCommands);
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ifaceCommands = {
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"*filter\n"
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"-D fw_INPUT -i rmnet_data0 -j RETURN\n"
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"-D fw_OUTPUT -o rmnet_data0 -j RETURN\n"
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"COMMIT\n"
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};
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EXPECT_EQ(0, mFw.setInterfaceRule("rmnet_data0", DENY));
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expectIptablesRestoreCommands(ifaceCommands);
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EXPECT_EQ(0, mFw.setInterfaceRule("rmnet_data0", DENY));
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expectIptablesRestoreCommands(noCommands);
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EXPECT_EQ(0, mFw.setFirewallType(WHITELIST));
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expectIptablesRestoreCommands(noCommands);
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EXPECT_EQ(0, mFw.resetFirewall());
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expectIptablesRestoreCommands(disableCommands);
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// TODO: calling resetFirewall and then setFirewallType(WHITELIST) does
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// nothing. This seems like a clear bug.
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EXPECT_EQ(0, mFw.setFirewallType(WHITELIST));
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expectIptablesRestoreCommands(noCommands);
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}
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TEST_F(FirewallControllerTest, TestDiscoverMaximumValidUid) {
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struct {
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const std::string description;
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const std::string content;
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const uint32_t expected;
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} testCases[] = {
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{
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.description = "root namespace case",
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.content = " 0 0 4294967295",
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.expected = 4294967294,
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},
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{
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.description = "container namespace case",
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.content = " 0 655360 5000\n"
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" 5000 600 50\n"
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" 5050 660410 1994950\n",
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.expected = 1999999,
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},
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{
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.description = "garbage content case",
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.content = "garbage",
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.expected = 4294967294,
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},
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{
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.description = "no content case",
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.content = "",
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.expected = 4294967294,
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},
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};
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const std::string tempFile = "/data/local/tmp/fake_uid_mapping";
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for (const auto& test : testCases) {
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EXPECT_TRUE(WriteStringToFile(test.content, tempFile, false));
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uint32_t got = FirewallController::discoverMaximumValidUid(tempFile);
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EXPECT_EQ(0, remove(tempFile.c_str()));
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if (got != test.expected) {
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FAIL() << test.description << ":\n"
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<< test.content << "\ngot " << got << ", but expected " << test.expected;
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}
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}
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// Also check when the file is not defined
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EXPECT_NE(0, access(tempFile.c_str(), F_OK));
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EXPECT_EQ(4294967294, FirewallController::discoverMaximumValidUid(tempFile));
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}
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} // namespace net
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} // namespace android
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