2 * Copyright 2016 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
16 * binder_test.cpp - unit tests for netd binder RPCs.
29 #include <sys/socket.h>
30 #include <sys/types.h>
31 #include <netinet/in.h>
33 #include <linux/if_tun.h>
35 #include <android-base/stringprintf.h>
36 #include <android-base/strings.h>
37 #include <cutils/multiuser.h>
38 #include <gtest/gtest.h>
39 #include <logwrap/logwrap.h>
40 #include <netutils/ifc.h>
42 #include "NetdConstants.h"
43 #include "android/net/INetd.h"
44 #include "android/net/UidRange.h"
45 #include "binder/IServiceManager.h"
47 #define TUN_DEV "/dev/tun"
49 using namespace android;
50 using namespace android::base;
51 using namespace android::binder;
52 using android::net::INetd;
53 using android::net::UidRange;
55 static const char* IP_RULE_V4 = "-4";
56 static const char* IP_RULE_V6 = "-6";
58 class BinderTest : public ::testing::Test {
62 sp<IServiceManager> sm = defaultServiceManager();
63 sp<IBinder> binder = sm->getService(String16("netd"));
64 if (binder != nullptr) {
65 mNetd = interface_cast<INetd>(binder);
69 void SetUp() override {
70 ASSERT_NE(nullptr, mNetd.get());
73 // Static because setting up the tun interface takes about 40ms.
74 static void SetUpTestCase() {
75 sTunFd = createTunInterface();
76 ASSERT_NE(-1, sTunFd);
79 static void TearDownTestCase() {
80 // Closing the socket removes the interface and IP addresses.
84 static void fakeRemoteSocketPair(int *clientSocket, int *serverSocket, int *acceptedSocket);
85 static int createTunInterface();
90 static in6_addr sSrcAddr, sDstAddr;
91 static char sSrcStr[], sDstStr[];
94 int BinderTest::sTunFd;
95 in6_addr BinderTest::sSrcAddr;
96 in6_addr BinderTest::sDstAddr;
97 char BinderTest::sSrcStr[INET6_ADDRSTRLEN];
98 char BinderTest::sDstStr[INET6_ADDRSTRLEN];
100 class TimedOperation : public Stopwatch {
102 TimedOperation(std::string name): mName(name) {}
103 virtual ~TimedOperation() {
104 fprintf(stderr, " %s: %6.1f ms\n", mName.c_str(), timeTaken());
111 TEST_F(BinderTest, TestIsAlive) {
112 TimedOperation t("isAlive RPC");
113 bool isAlive = false;
114 mNetd->isAlive(&isAlive);
115 ASSERT_TRUE(isAlive);
118 static int randomUid() {
119 return 100000 * arc4random_uniform(7) + 10000 + arc4random_uniform(5000);
122 static std::vector<std::string> runCommand(const std::string& command) {
123 std::vector<std::string> lines;
126 if ((f = popen(command.c_str(), "r")) == nullptr) {
131 char *line = nullptr;
134 while ((linelen = getline(&line, &bufsize, f)) >= 0) {
135 lines.push_back(std::string(line, linelen));
144 static std::vector<std::string> listIpRules(const char *ipVersion) {
145 std::string command = StringPrintf("%s %s rule list", IP_PATH, ipVersion);
146 return runCommand(command);
149 static std::vector<std::string> listIptablesRule(const char *binary, const char *chainName) {
150 std::string command = StringPrintf("%s -w -n -L %s", binary, chainName);
151 return runCommand(command);
154 static int iptablesRuleLineLength(const char *binary, const char *chainName) {
155 return listIptablesRule(binary, chainName).size();
158 TEST_F(BinderTest, TestFirewallReplaceUidChain) {
159 std::string chainName = StringPrintf("netd_binder_test_%u", arc4random_uniform(10000));
160 const int kNumUids = 500;
161 std::vector<int32_t> noUids(0);
162 std::vector<int32_t> uids(kNumUids);
163 for (int i = 0; i < kNumUids; i++) {
164 uids[i] = randomUid();
169 TimedOperation op(StringPrintf("Programming %d-UID whitelist chain", kNumUids));
170 mNetd->firewallReplaceUidChain(String16(chainName.c_str()), true, uids, &ret);
172 EXPECT_EQ(true, ret);
173 EXPECT_EQ((int) uids.size() + 5, iptablesRuleLineLength(IPTABLES_PATH, chainName.c_str()));
174 EXPECT_EQ((int) uids.size() + 11, iptablesRuleLineLength(IP6TABLES_PATH, chainName.c_str()));
176 TimedOperation op("Clearing whitelist chain");
177 mNetd->firewallReplaceUidChain(String16(chainName.c_str()), false, noUids, &ret);
179 EXPECT_EQ(true, ret);
180 EXPECT_EQ(3, iptablesRuleLineLength(IPTABLES_PATH, chainName.c_str()));
181 EXPECT_EQ(3, iptablesRuleLineLength(IP6TABLES_PATH, chainName.c_str()));
184 TimedOperation op(StringPrintf("Programming %d-UID blacklist chain", kNumUids));
185 mNetd->firewallReplaceUidChain(String16(chainName.c_str()), false, uids, &ret);
187 EXPECT_EQ(true, ret);
188 EXPECT_EQ((int) uids.size() + 3, iptablesRuleLineLength(IPTABLES_PATH, chainName.c_str()));
189 EXPECT_EQ((int) uids.size() + 3, iptablesRuleLineLength(IP6TABLES_PATH, chainName.c_str()));
192 TimedOperation op("Clearing blacklist chain");
193 mNetd->firewallReplaceUidChain(String16(chainName.c_str()), false, noUids, &ret);
195 EXPECT_EQ(true, ret);
196 EXPECT_EQ(3, iptablesRuleLineLength(IPTABLES_PATH, chainName.c_str()));
197 EXPECT_EQ(3, iptablesRuleLineLength(IP6TABLES_PATH, chainName.c_str()));
199 // Check that the call fails if iptables returns an error.
200 std::string veryLongStringName = "netd_binder_test_UnacceptablyLongIptablesChainName";
201 mNetd->firewallReplaceUidChain(String16(veryLongStringName.c_str()), true, noUids, &ret);
202 EXPECT_EQ(false, ret);
205 static int bandwidthDataSaverEnabled(const char *binary) {
206 std::vector<std::string> lines = listIptablesRule(binary, "bw_data_saver");
208 // Output looks like this:
210 // Chain bw_data_saver (1 references)
211 // target prot opt source destination
212 // RETURN all -- 0.0.0.0/0 0.0.0.0/0
213 EXPECT_EQ(3U, lines.size());
214 if (lines.size() != 3) return -1;
216 EXPECT_TRUE(android::base::StartsWith(lines[2], "RETURN ") ||
217 android::base::StartsWith(lines[2], "REJECT "));
219 return android::base::StartsWith(lines[2], "REJECT");
222 bool enableDataSaver(sp<INetd>& netd, bool enable) {
223 TimedOperation op(enable ? " Enabling data saver" : "Disabling data saver");
225 netd->bandwidthEnableDataSaver(enable, &ret);
229 int getDataSaverState() {
230 const int enabled4 = bandwidthDataSaverEnabled(IPTABLES_PATH);
231 const int enabled6 = bandwidthDataSaverEnabled(IP6TABLES_PATH);
232 EXPECT_EQ(enabled4, enabled6);
233 EXPECT_NE(-1, enabled4);
234 EXPECT_NE(-1, enabled6);
235 if (enabled4 != enabled6 || (enabled6 != 0 && enabled6 != 1)) {
241 TEST_F(BinderTest, TestBandwidthEnableDataSaver) {
242 const int wasEnabled = getDataSaverState();
243 ASSERT_NE(-1, wasEnabled);
246 ASSERT_TRUE(enableDataSaver(mNetd, false));
247 EXPECT_EQ(0, getDataSaverState());
250 ASSERT_TRUE(enableDataSaver(mNetd, false));
251 EXPECT_EQ(0, getDataSaverState());
253 ASSERT_TRUE(enableDataSaver(mNetd, true));
254 EXPECT_EQ(1, getDataSaverState());
256 ASSERT_TRUE(enableDataSaver(mNetd, true));
257 EXPECT_EQ(1, getDataSaverState());
260 ASSERT_TRUE(enableDataSaver(mNetd, false));
261 EXPECT_EQ(0, getDataSaverState());
265 static bool ipRuleExistsForRange(const uint32_t priority, const UidRange& range,
266 const std::string& action, const char* ipVersion) {
267 // Output looks like this:
268 // "12500:\tfrom all fwmark 0x0/0x20000 iif lo uidrange 1000-2000 prohibit"
269 std::vector<std::string> rules = listIpRules(ipVersion);
271 std::string prefix = StringPrintf("%" PRIu32 ":", priority);
272 std::string suffix = StringPrintf(" iif lo uidrange %d-%d %s\n",
273 range.getStart(), range.getStop(), action.c_str());
274 for (std::string line : rules) {
275 if (android::base::StartsWith(line, prefix.c_str())
276 && android::base::EndsWith(line, suffix.c_str())) {
283 static bool ipRuleExistsForRange(const uint32_t priority, const UidRange& range,
284 const std::string& action) {
285 bool existsIp4 = ipRuleExistsForRange(priority, range, action, IP_RULE_V4);
286 bool existsIp6 = ipRuleExistsForRange(priority, range, action, IP_RULE_V6);
287 EXPECT_EQ(existsIp4, existsIp6);
291 TEST_F(BinderTest, TestNetworkRejectNonSecureVpn) {
292 constexpr uint32_t RULE_PRIORITY = 12500;
294 constexpr int baseUid = MULTIUSER_APP_PER_USER_RANGE * 5;
295 std::vector<UidRange> uidRanges = {
296 {baseUid + 150, baseUid + 224},
297 {baseUid + 226, baseUid + 300}
300 const std::vector<std::string> initialRulesV4 = listIpRules(IP_RULE_V4);
301 const std::vector<std::string> initialRulesV6 = listIpRules(IP_RULE_V6);
303 // Create two valid rules.
304 ASSERT_TRUE(mNetd->networkRejectNonSecureVpn(true, uidRanges).isOk());
305 EXPECT_EQ(initialRulesV4.size() + 2, listIpRules(IP_RULE_V4).size());
306 EXPECT_EQ(initialRulesV6.size() + 2, listIpRules(IP_RULE_V6).size());
307 for (auto const& range : uidRanges) {
308 EXPECT_TRUE(ipRuleExistsForRange(RULE_PRIORITY, range, "prohibit"));
312 ASSERT_TRUE(mNetd->networkRejectNonSecureVpn(false, uidRanges).isOk());
313 EXPECT_EQ(initialRulesV4.size(), listIpRules(IP_RULE_V4).size());
314 EXPECT_EQ(initialRulesV6.size(), listIpRules(IP_RULE_V6).size());
315 for (auto const& range : uidRanges) {
316 EXPECT_FALSE(ipRuleExistsForRange(RULE_PRIORITY, range, "prohibit"));
319 // Fail to remove the rules a second time after they are already deleted.
320 binder::Status status = mNetd->networkRejectNonSecureVpn(false, uidRanges);
321 ASSERT_EQ(binder::Status::EX_SERVICE_SPECIFIC, status.exceptionCode());
322 EXPECT_EQ(ENOENT, status.serviceSpecificErrorCode());
324 // All rules should be the same as before.
325 EXPECT_EQ(initialRulesV4, listIpRules(IP_RULE_V4));
326 EXPECT_EQ(initialRulesV6, listIpRules(IP_RULE_V6));
329 int BinderTest::createTunInterface() {
330 // Generate a random ULA address pair.
331 arc4random_buf(&sSrcAddr, sizeof(sSrcAddr));
332 sSrcAddr.s6_addr[0] = 0xfd;
333 memcpy(&sDstAddr, &sSrcAddr, sizeof(sDstAddr));
334 sDstAddr.s6_addr[15] ^= 1;
336 // Convert the addresses to strings because that's what ifc_add_address takes.
337 sockaddr_in6 src6 = { .sin6_family = AF_INET6, .sin6_addr = sSrcAddr, };
338 sockaddr_in6 dst6 = { .sin6_family = AF_INET6, .sin6_addr = sDstAddr, };
339 int flags = NI_NUMERICHOST;
340 if (getnameinfo((sockaddr *) &src6, sizeof(src6), sSrcStr, sizeof(sSrcStr), NULL, 0, flags) ||
341 getnameinfo((sockaddr *) &dst6, sizeof(dst6), sDstStr, sizeof(sDstStr), NULL, 0, flags)) {
345 // Create a tun interface with a name based on our PID.
347 .ifr_ifru = { .ifru_flags = IFF_TUN },
349 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "netdtest%u", getpid());
351 int fd = open(TUN_DEV, O_RDWR | O_NONBLOCK | O_CLOEXEC);
352 EXPECT_NE(-1, fd) << TUN_DEV << ": " << strerror(errno);
353 if (fd == -1) return fd;
355 int ret = ioctl(fd, TUNSETIFF, &ifr, sizeof(ifr));
356 EXPECT_EQ(0, ret) << "TUNSETIFF: " << strerror(errno);
362 if (ifc_add_address(ifr.ifr_name, sSrcStr, 64) ||
363 ifc_add_address(ifr.ifr_name, sDstStr, 64)) {
370 // Create a socket pair that isLoopbackSocket won't think is local.
371 void BinderTest::fakeRemoteSocketPair(int *clientSocket, int *serverSocket, int *acceptedSocket) {
372 *serverSocket = socket(AF_INET6, SOCK_STREAM, 0);
373 struct sockaddr_in6 server6 = { .sin6_family = AF_INET6, .sin6_addr = sDstAddr };
374 ASSERT_EQ(0, bind(*serverSocket, (struct sockaddr *) &server6, sizeof(server6)));
376 socklen_t addrlen = sizeof(server6);
377 ASSERT_EQ(0, getsockname(*serverSocket, (struct sockaddr *) &server6, &addrlen));
378 ASSERT_EQ(0, listen(*serverSocket, 10));
380 *clientSocket = socket(AF_INET6, SOCK_STREAM, 0);
381 struct sockaddr_in6 client6 = { .sin6_family = AF_INET6, .sin6_addr = sSrcAddr };
382 ASSERT_EQ(0, bind(*clientSocket, (struct sockaddr *) &client6, sizeof(client6)));
383 ASSERT_EQ(0, connect(*clientSocket, (struct sockaddr *) &server6, sizeof(server6)));
384 ASSERT_EQ(0, getsockname(*clientSocket, (struct sockaddr *) &client6, &addrlen));
386 *acceptedSocket = accept(*serverSocket, (struct sockaddr *) &server6, &addrlen);
387 ASSERT_NE(-1, *acceptedSocket);
389 ASSERT_EQ(0, memcmp(&client6, &server6, sizeof(client6)));
392 void checkSocketpairOpen(int clientSocket, int acceptedSocket) {
394 EXPECT_EQ(4, write(clientSocket, "foo", sizeof("foo")));
395 EXPECT_EQ(4, read(acceptedSocket, buf, sizeof(buf)));
396 EXPECT_EQ(0, memcmp(buf, "foo", sizeof("foo")));
399 void checkSocketpairClosed(int clientSocket, int acceptedSocket) {
400 // Check that the client socket was closed with ECONNABORTED.
401 int ret = write(clientSocket, "foo", sizeof("foo"));
404 EXPECT_EQ(ECONNABORTED, err);
406 // Check that it sent a RST to the server.
407 ret = write(acceptedSocket, "foo", sizeof("foo"));
410 EXPECT_EQ(ECONNRESET, err);
413 TEST_F(BinderTest, TestSocketDestroy) {
414 int clientSocket, serverSocket, acceptedSocket;
415 ASSERT_NO_FATAL_FAILURE(fakeRemoteSocketPair(&clientSocket, &serverSocket, &acceptedSocket));
417 // Pick a random UID in the system UID range.
418 constexpr int baseUid = AID_APP - 2000;
419 static_assert(baseUid > 0, "Not enough UIDs? Please fix this test.");
420 int uid = baseUid + 500 + arc4random_uniform(1000);
421 EXPECT_EQ(0, fchown(clientSocket, uid, -1));
423 // UID ranges that don't contain uid.
424 std::vector<UidRange> uidRanges = {
425 {baseUid + 42, baseUid + 449},
426 {baseUid + 1536, AID_APP - 4},
427 {baseUid + 498, uid - 1},
428 {uid + 1, baseUid + 1520},
430 // A skip list that doesn't contain UID.
431 std::vector<int32_t> skipUids { baseUid + 123, baseUid + 1600 };
433 // Close sockets. Our test socket should be intact.
434 EXPECT_TRUE(mNetd->socketDestroy(uidRanges, skipUids).isOk());
435 checkSocketpairOpen(clientSocket, acceptedSocket);
437 // UID ranges that do contain uid.
439 {baseUid + 42, baseUid + 449},
440 {baseUid + 1536, AID_APP - 4},
441 {baseUid + 498, baseUid + 1520},
443 // Add uid to the skip list.
444 skipUids.push_back(uid);
446 // Close sockets. Our test socket should still be intact because it's in the skip list.
447 EXPECT_TRUE(mNetd->socketDestroy(uidRanges, skipUids).isOk());
448 checkSocketpairOpen(clientSocket, acceptedSocket);
450 // Now remove uid from skipUids, and close sockets. Our test socket should have been closed.
451 skipUids.resize(skipUids.size() - 1);
452 EXPECT_TRUE(mNetd->socketDestroy(uidRanges, skipUids).isOk());
453 checkSocketpairClosed(clientSocket, acceptedSocket);
457 close(acceptedSocket);