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/*
* Copyright (C) 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#pragma once
#include <arpa/nameser.h>
#include <netdb.h>
#include <string>
#include <vector>
#include <aidl/android/net/INetd.h>
#include <android-base/properties.h>
#include <android-modules-utils/sdk_level.h>
#include <firewall.h>
#include <gtest/gtest.h>
#include <netdutils/InternetAddresses.h>
#include "dns_responder/dns_responder.h"
class ScopeBlockedUIDRule {
using INetd = aidl::android::net::INetd;
public:
ScopeBlockedUIDRule(INetd* netSrv, uid_t testUid)
: mNetSrv(netSrv), mTestUid(testUid), mSavedUid(getuid()) {
// Add drop rule for testUid. Also enable the standby chain because it might not be
// enabled. Unfortunately we cannot use FIREWALL_CHAIN_NONE, or custom iptables rules, for
// this purpose because netd calls fchown() on the DNS query sockets, and "iptables -m
// owner" matches the UID of the socket creator, not the UID set by fchown().
// TODO: migrate FIREWALL_CHAIN_NONE to eBPF as well.
if (android::modules::sdklevel::IsAtLeastT()) {
mFw = Firewall::getInstance();
EXPECT_RESULT_OK(mFw->toggleStandbyMatch(true));
EXPECT_RESULT_OK(mFw->addRule(mTestUid, STANDBY_MATCH));
} else {
EXPECT_TRUE(
mNetSrv->firewallEnableChildChain(INetd::FIREWALL_CHAIN_STANDBY, true).isOk());
EXPECT_TRUE(mNetSrv->firewallSetUidRule(INetd::FIREWALL_CHAIN_STANDBY, mTestUid,
INetd::FIREWALL_RULE_DENY)
.isOk());
}
EXPECT_TRUE(seteuid(mTestUid) == 0);
};
~ScopeBlockedUIDRule() {
// Restore uid
EXPECT_TRUE(seteuid(mSavedUid) == 0);
// Remove drop rule for testUid, and disable the standby chain.
if (android::modules::sdklevel::IsAtLeastT()) {
EXPECT_RESULT_OK(mFw->removeRule(mTestUid, STANDBY_MATCH));
EXPECT_RESULT_OK(mFw->toggleStandbyMatch(false));
} else {
EXPECT_TRUE(mNetSrv->firewallSetUidRule(INetd::FIREWALL_CHAIN_STANDBY, mTestUid,
INetd::FIREWALL_RULE_ALLOW)
.isOk());
EXPECT_TRUE(
mNetSrv->firewallEnableChildChain(INetd::FIREWALL_CHAIN_STANDBY, false).isOk());
}
}
private:
INetd* mNetSrv;
Firewall* mFw;
const uid_t mTestUid;
const uid_t mSavedUid;
};
class ScopedChangeUID {
public:
ScopedChangeUID(uid_t testUid) : mTestUid(testUid), mSavedUid(getuid()) {
EXPECT_TRUE(seteuid(mTestUid) == 0);
};
~ScopedChangeUID() { EXPECT_TRUE(seteuid(mSavedUid) == 0); }
private:
const uid_t mTestUid;
const uid_t mSavedUid;
};
class ScopedSystemProperties {
public:
ScopedSystemProperties(const std::string& key, const std::string& value) : mStoredKey(key) {
mStoredValue = android::base::GetProperty(key, "");
android::base::SetProperty(key, value);
}
~ScopedSystemProperties() { android::base::SetProperty(mStoredKey, mStoredValue); }
private:
std::string mStoredKey;
std::string mStoredValue;
};
class ScopedDefaultNetwork {
using INetd = aidl::android::net::INetd;
public:
ScopedDefaultNetwork(INetd* netSrv, uid_t testDefaultNetwork) : mNetSrv(netSrv) {
EXPECT_TRUE(mNetSrv->networkGetDefault(&mStoredDefaultNetwork).isOk());
EXPECT_TRUE(mNetSrv->networkSetDefault(testDefaultNetwork).isOk());
};
~ScopedDefaultNetwork() {
EXPECT_TRUE(mNetSrv->networkSetDefault(mStoredDefaultNetwork).isOk());
}
private:
INetd* mNetSrv;
int mStoredDefaultNetwork;
};
struct DnsRecord {
std::string host_name; // host name
ns_type type; // record type
std::string addr; // ipv4/v6 address
};
// TODO: make this dynamic and stop depending on implementation details.
constexpr int TEST_NETID = 30;
// Use the biggest two reserved appId for applications to avoid conflict with existing uids.
constexpr int TEST_UID = 99999;
constexpr int TEST_UID2 = 99998;
constexpr char kDnsPortString[] = "53";
constexpr char kDohPortString[] = "443";
constexpr char kDotPortString[] = "853";
const std::string kFlagPrefix("persist.device_config.netd_native.");
const std::string kDohEarlyDataFlag(kFlagPrefix + "doh_early_data");
const std::string kDohIdleTimeoutFlag(kFlagPrefix + "doh_idle_timeout_ms");
const std::string kDohProbeTimeoutFlag(kFlagPrefix + "doh_probe_timeout_ms");
const std::string kDohQueryTimeoutFlag(kFlagPrefix + "doh_query_timeout_ms");
const std::string kDohSessionResumptionFlag(kFlagPrefix + "doh_session_resumption");
const std::string kDotAsyncHandshakeFlag(kFlagPrefix + "dot_async_handshake");
const std::string kDotConnectTimeoutMsFlag(kFlagPrefix + "dot_connect_timeout_ms");
const std::string kDotMaxretriesFlag(kFlagPrefix + "dot_maxtries");
const std::string kDotQueryTimeoutMsFlag(kFlagPrefix + "dot_query_timeout_ms");
const std::string kDotQuickFallbackFlag(kFlagPrefix + "dot_quick_fallback");
const std::string kDotRevalidationThresholdFlag(kFlagPrefix + "dot_revalidation_threshold");
const std::string kDotXportUnusableThresholdFlag(kFlagPrefix + "dot_xport_unusable_threshold");
const std::string kDotValidationLatencyFactorFlag(kFlagPrefix + "dot_validation_latency_factor");
const std::string kDotValidationLatencyOffsetMsFlag(kFlagPrefix +
"dot_validation_latency_offset_ms");
const std::string kKeepListeningUdpFlag(kFlagPrefix + "keep_listening_udp");
const std::string kParallelLookupSleepTimeFlag(kFlagPrefix + "parallel_lookup_sleep_time");
const std::string kRetransIntervalFlag(kFlagPrefix + "retransmission_time_interval");
const std::string kRetryCountFlag(kFlagPrefix + "retry_count");
const std::string kSkip4aQueryOnV6LinklocalAddrFlag(kFlagPrefix +
"skip_4a_query_on_v6_linklocal_addr");
const std::string kSortNameserversFlag(kFlagPrefix + "sort_nameservers");
const std::string kPersistNetPrefix("persist.net.");
const std::string kQueryLogSize(kPersistNetPrefix + "dns_query_log_size");
static constexpr char kLocalHost[] = "localhost";
static constexpr char kLocalHostAddr[] = "127.0.0.1";
static constexpr char kIp6LocalHost[] = "ip6-localhost";
static constexpr char kIp6LocalHostAddr[] = "::1";
static constexpr char kHelloExampleCom[] = "hello.example.com.";
static constexpr char kHelloExampleComAddrV4[] = "1.2.3.4";
static constexpr char kHelloExampleComAddrV4_2[] = "8.8.8.8";
static constexpr char kHelloExampleComAddrV4_3[] = "81.117.21.202";
static constexpr char kHelloExampleComAddrV6[] = "::1.2.3.4";
static constexpr char kHelloExampleComAddrV6_IPV4COMPAT[] = "::1.2.3.4";
static constexpr char kHelloExampleComAddrV6_TEREDO[] = "2001::47c1";
static constexpr char kHelloExampleComAddrV6_GUA[] = "2404:6800::5175:15ca";
static constexpr char kExampleComDomain[] = ".example.com";
static const std::string kNat64Prefix = "64:ff9b::/96";
static const std::string kNat64Prefix2 = "2001:db8:6464::/96";
constexpr size_t kMaxmiumLabelSize = 63; // see RFC 1035 section 2.3.4.
static const std::vector<uint8_t> kHelloExampleComQueryV4 = {
/* Header */
0x00, 0x00, /* Transaction ID: 0x0000 */
0x01, 0x00, /* Flags: rd */
0x00, 0x01, /* Questions: 1 */
0x00, 0x00, /* Answer RRs: 0 */
0x00, 0x00, /* Authority RRs: 0 */
0x00, 0x00, /* Additional RRs: 0 */
/* Queries */
0x05, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x07, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x03,
0x63, 0x6f, 0x6d, 0x00, /* Name: hello.example.com */
0x00, 0x01, /* Type: A */
0x00, 0x01 /* Class: IN */
};
static const std::vector<uint8_t> kHelloExampleComResponseV4 = {
/* Header */
0x00, 0x00, /* Transaction ID: 0x0000 */
0x81, 0x80, /* Flags: qr rd ra */
0x00, 0x01, /* Questions: 1 */
0x00, 0x01, /* Answer RRs: 1 */
0x00, 0x00, /* Authority RRs: 0 */
0x00, 0x00, /* Additional RRs: 0 */
/* Queries */
0x05, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x07, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x03,
0x63, 0x6f, 0x6d, 0x00, /* Name: hello.example.com */
0x00, 0x01, /* Type: A */
0x00, 0x01, /* Class: IN */
/* Answers */
0x05, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x07, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x03,
0x63, 0x6f, 0x6d, 0x00, /* Name: hello.example.com */
0x00, 0x01, /* Type: A */
0x00, 0x01, /* Class: IN */
0x00, 0x00, 0x00, 0x00, /* Time to live: 0 */
0x00, 0x04, /* Data length: 4 */
0x01, 0x02, 0x03, 0x04 /* Address: 1.2.3.4 */
};
const std::vector<uint8_t> kHelloExampleComResponsesV4 = {
// scapy.DNS(
// id=0,
// qr=1,
// ra=1,
// qd=scapy.DNSQR(qname="hello.example.com",qtype="A"),
// an=scapy.DNSRR(rrname="hello.example.com",type="A",ttl=0,rdata='1.2.3.4') /
// scapy.DNSRR(rrname="hello.example.com",type="A",ttl=0,rdata='8.8.8.8') /
// scapy.DNSRR(rrname="hello.example.com",type="A",ttl=0,rdata='81.117.21.202'))
/* Header */
0x00, 0x00, /* Transaction ID: 0x0000 */
0x81, 0x80, /* Flags: qr rd ra */
0x00, 0x01, /* Questions: 1 */
0x00, 0x03, /* Answer RRs: 3 */
0x00, 0x00, /* Authority RRs: 0 */
0x00, 0x00, /* Additional RRs: 0 */
/* Queries */
0x05, 0x68, 0x65, 0x6C, 0x6C, 0x6F, 0x07, 0x65, 0x78, 0x61, 0x6D, 0x70, 0x6C, 0x65, 0x03,
0x63, 0x6F, 0x6D, 0x00, /* Name: hello.example.com */
0x00, 0x01, /* Type: A */
0x00, 0x01, /* Class: IN */
/* Answers */
0x05, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x07, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x03,
0x63, 0x6f, 0x6d, 0x00, /* Name: hello.example.com */
0x00, 0x01, /* Type: A */
0x00, 0x01, /* Class: IN */
0x00, 0x00, 0x00, 0x00, /* Time to live: 0 */
0x00, 0x04, /* Data length: 4 */
0x01, 0x02, 0x03, 0x04, /* Address: 1.2.3.4 */
0x05, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x07, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x03,
0x63, 0x6f, 0x6d, 0x00, /* Name: hello.example.com */
0x00, 0x01, /* Type: A */
0x00, 0x01, /* Class: IN */
0x00, 0x00, 0x00, 0x00, /* Time to live: 0 */
0x00, 0x04, /* Data length: 4 */
0x08, 0x08, 0x08, 0x08, /* Address: 8.8.8.8 */
0x05, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x07, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x03,
0x63, 0x6f, 0x6d, 0x00, /* Name: hello.example.com */
0x00, 0x01, /* Type: A */
0x00, 0x01, /* Class: IN */
0x00, 0x00, 0x00, 0x00, /* Time to live: 0 */
0x00, 0x04, /* Data length: 4 */
0x51, 0x75, 0x15, 0xca /* Address: 81.117.21.202 */
};
static const std::vector<uint8_t> kHelloExampleComQueryV6 = {
/* Header */
0x00, 0x00, /* Transaction ID: 0x0000 */
0x01, 0x00, /* Flags: rd */
0x00, 0x01, /* Questions: 1 */
0x00, 0x00, /* Answer RRs: 0 */
0x00, 0x00, /* Authority RRs: 0 */
0x00, 0x00, /* Additional RRs: 0 */
/* Queries */
0x05, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x07, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x03,
0x63, 0x6f, 0x6d, 0x00, /* Name: hello.example.com */
0x00, 0x1c, /* Type: AAAA */
0x00, 0x01 /* Class: IN */
};
const std::vector<uint8_t> kHelloExampleComResponsesV6 = {
// The addresses are IPv4-compatible address, teredo tunneling address and global unicast
// address.
//
// scapy.DNS(
// id=0,
// qr=1,
// ra=1,
// qd=scapy.DNSQR(qname="hello.example.com",qtype="AAAA"),
// an=scapy.DNSRR(rrname="hello.example.com",type="AAAA",rdata='::1.2.3.4') /
// scapy.DNSRR(rrname="hello.example.com",type="AAAA",rdata='2001::47c1') /
// scapy.DNSRR(rrname="hello.example.com",type="AAAA",rdata='2404:6800::5175:15ca'))
/* Header */
0x00, 0x00, /* Transaction ID: 0x0000 */
0x81, 0x80, /* Flags: qr rd ra */
0x00, 0x01, /* Questions: 1 */
0x00, 0x03, /* Answer RRs: 3 */
0x00, 0x00, /* Authority RRs: 0 */
0x00, 0x00, /* Additional RRs: 0 */
/* Queries */
0x05, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x07, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x03,
0x63, 0x6f, 0x6d, 0x00, /* Name: hello.example.com */
0x00, 0x1c, /* Type: AAAA */
0x00, 0x01, /* Class: IN */
/* Answers */
0x05, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x07, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x03,
0x63, 0x6f, 0x6d, 0x00, /* Name: hello.example.com */
0x00, 0x1c, /* Type: AAAA */
0x00, 0x01, /* Class: IN */
0x00, 0x00, 0x00, 0x00, /* Time to live: 0 */
0x00, 0x10, /* Data length: 4 */
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03,
0x04, /* Address: ::1.2.3.4 */
0x05, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x07, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x03,
0x63, 0x6f, 0x6d, 0x00, /* Name: hello.example.com */
0x00, 0x1c, /* Type: AAAA */
0x00, 0x01, /* Class: IN */
0x00, 0x00, 0x00, 0x00, /* Time to live: 0 */
0x00, 0x10, /* Data length: 4 */
0x20, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x47,
0xc1, /* Address: 2001::47c1 */
0x05, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x07, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x03,
0x63, 0x6f, 0x6d, 0x00, /* Name: hello.example.com */
0x00, 0x1c, /* Type: AAAA */
0x00, 0x01, /* Class: IN */
0x00, 0x00, 0x00, 0x00, /* Time to live: 0 */
0x00, 0x10, /* Data length: 4 */
0x24, 0x04, 0x68, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x51, 0x75, 0x15,
0xCA /* Address: 2404:6800::5175:15ca */
};
// Illegal hostnames
static constexpr char kBadCharAfterPeriodHost[] = "hello.example.^com.";
static constexpr char kBadCharBeforePeriodHost[] = "hello.example^.com.";
static constexpr char kBadCharAtTheEndHost[] = "hello.example.com^.";
static constexpr char kBadCharInTheMiddleOfLabelHost[] = "hello.ex^ample.com.";
static const test::DNSHeader kDefaultDnsHeader = {
// Don't need to initialize the flag "id" and "rd" because DNS responder assigns them from
// query to response. See RFC 1035 section 4.1.1.
.id = 0, // unused. should be assigned from query to response
.ra = false, // recursive query support is not available
.rcode = ns_r_noerror, // no error
.qr = true, // message is a response
.opcode = QUERY, // a standard query
.aa = false, // answer/authority portion was not authenticated by the server
.tr = false, // message is not truncated
.rd = false, // unused. should be assigned from query to response
.ad = false, // non-authenticated data is unacceptable
};
// The CNAME chain records for building a response message which exceeds 512 bytes.
//
// Ignoring the other fields of the message, the response message has 8 CNAMEs in 5 answer RRs
// and each CNAME has 77 bytes as the follows. The response message at least has 616 bytes in
// answer section and has already exceeded 512 bytes totally.
//
// The CNAME is presented as:
// 0 1 64 65 72 73 76 77
// +---+--........--+---+---+---+---+---+---+---+---+---+---+---+---+---+
// | 63| {x, .., x} | 7 | e | x | a | m | p | l | e | 3 | c | o | m | 0 |
// +---+--........--+---+---+---+---+---+---+---+---+---+---+---+---+---+
// ^-- x = {a, b, c, d}
//
const std::string kCnameA = std::string(kMaxmiumLabelSize, 'a') + kExampleComDomain + ".";
const std::string kCnameB = std::string(kMaxmiumLabelSize, 'b') + kExampleComDomain + ".";
const std::string kCnameC = std::string(kMaxmiumLabelSize, 'c') + kExampleComDomain + ".";
const std::string kCnameD = std::string(kMaxmiumLabelSize, 'd') + kExampleComDomain + ".";
const std::vector<DnsRecord> kLargeCnameChainRecords = {
{kHelloExampleCom, ns_type::ns_t_cname, kCnameA},
{kCnameA, ns_type::ns_t_cname, kCnameB},
{kCnameB, ns_type::ns_t_cname, kCnameC},
{kCnameC, ns_type::ns_t_cname, kCnameD},
{kCnameD, ns_type::ns_t_a, kHelloExampleComAddrV4},
};
// TODO: Integrate GetNumQueries relevent functions
size_t GetNumQueries(const test::DNSResponder& dns, const char* name);
size_t GetNumQueriesForProtocol(const test::DNSResponder& dns, const int protocol,
const char* name);
size_t GetNumQueriesForType(const test::DNSResponder& dns, ns_type type, const char* name);
std::string ToString(const hostent* he);
std::string ToString(const addrinfo* ai);
std::string ToString(const android::netdutils::ScopedAddrinfo& ai);
std::string ToString(const sockaddr_storage* addr);
std::vector<std::string> ToStrings(const hostent* he);
std::vector<std::string> ToStrings(const addrinfo* ai);
std::vector<std::string> ToStrings(const android::netdutils::ScopedAddrinfo& ai);
// Wait for |condition| to be met until |timeout|.
bool PollForCondition(const std::function<bool()>& condition,
std::chrono::milliseconds timeout = std::chrono::milliseconds(1000));
android::netdutils::ScopedAddrinfo safe_getaddrinfo(const char* node, const char* service,
const struct addrinfo* hints);
void SetMdnsRoute();
void RemoveMdnsRoute();
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