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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
#include "secerr.h"
#include "ssl.h"
#include "ssl3prot.h"
#include "sslerr.h"
#include "sslproto.h"
#include "gtest_utils.h"
#include "nss_scoped_ptrs.h"
#include "tls_connect.h"
#include "tls_filter.h"
#include "tls_parser.h"
namespace nss_test {
TEST_P(TlsConnectStream, ServerNegotiateTls10) {
uint16_t minver, maxver;
client_->GetVersionRange(&minver, &maxver);
client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_0, maxver);
server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_0,
SSL_LIBRARY_VERSION_TLS_1_0);
Connect();
}
TEST_P(TlsConnectGeneric, ServerNegotiateTls11) {
if (version_ < SSL_LIBRARY_VERSION_TLS_1_1) GTEST_SKIP();
uint16_t minver, maxver;
client_->GetVersionRange(&minver, &maxver);
client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1, maxver);
server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
SSL_LIBRARY_VERSION_TLS_1_1);
Connect();
}
TEST_P(TlsConnectGeneric, ServerNegotiateTls12) {
if (version_ < SSL_LIBRARY_VERSION_TLS_1_2) GTEST_SKIP();
uint16_t minver, maxver;
client_->GetVersionRange(&minver, &maxver);
client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_2, maxver);
server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_2,
SSL_LIBRARY_VERSION_TLS_1_2);
Connect();
}
TEST_P(TlsConnectGeneric,
ClientOfferTls11_Tls13ServerNegotiateEachVersionOneByOne) {
// DTLS does not support 1.0
if (variant_ == ssl_variant_datagram) {
client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
SSL_LIBRARY_VERSION_TLS_1_3);
} else {
client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_0,
SSL_LIBRARY_VERSION_TLS_1_3);
}
server_->SetVersionRange(version_, version_);
Connect();
}
// Test the ServerRandom version hack from
// [draft-ietf-tls-tls13-11 Section 6.3.1.1].
// The first three tests test for active tampering. The next
// two validate that we can also detect fallback using the
// SSL_SetDowngradeCheckVersion() API.
TEST_F(TlsConnectTest, TestDowngradeDetectionToTls11) {
client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_0,
SSL_LIBRARY_VERSION_TLS_1_2);
server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_0,
SSL_LIBRARY_VERSION_TLS_1_2);
client_->SetOption(SSL_ENABLE_HELLO_DOWNGRADE_CHECK, PR_TRUE);
MakeTlsFilter<TlsMessageVersionSetter>(client_, kTlsHandshakeClientHello,
SSL_LIBRARY_VERSION_TLS_1_1);
ConnectExpectAlert(client_, kTlsAlertIllegalParameter);
client_->CheckErrorCode(SSL_ERROR_RX_MALFORMED_SERVER_HELLO);
server_->CheckErrorCode(SSL_ERROR_ILLEGAL_PARAMETER_ALERT);
}
// Attempt to negotiate the bogus DTLS 1.1 version.
TEST_F(DtlsConnectTest, TestDtlsVersion11) {
MakeTlsFilter<TlsMessageVersionSetter>(client_, kTlsHandshakeClientHello,
((~0x0101) & 0xffff));
ConnectExpectAlert(server_, kTlsAlertProtocolVersion);
client_->CheckErrorCode(SSL_ERROR_PROTOCOL_VERSION_ALERT);
server_->CheckErrorCode(SSL_ERROR_UNSUPPORTED_VERSION);
}
TEST_F(TlsConnectTest, TestDowngradeDetectionToTls12) {
client_->SetOption(SSL_ENABLE_HELLO_DOWNGRADE_CHECK, PR_TRUE);
MakeTlsFilter<TlsExtensionDropper>(client_, ssl_tls13_supported_versions_xtn);
client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_2,
SSL_LIBRARY_VERSION_TLS_1_3);
server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_2,
SSL_LIBRARY_VERSION_TLS_1_3);
ConnectExpectAlert(client_, kTlsAlertIllegalParameter);
client_->CheckErrorCode(SSL_ERROR_RX_MALFORMED_SERVER_HELLO);
server_->CheckErrorCode(SSL_ERROR_ILLEGAL_PARAMETER_ALERT);
}
// Disabling downgrade checks will be caught when the Finished MAC check fails.
TEST_F(TlsConnectTest, TestDisableDowngradeDetection) {
client_->SetOption(SSL_ENABLE_HELLO_DOWNGRADE_CHECK, PR_FALSE);
MakeTlsFilter<TlsExtensionDropper>(client_, ssl_tls13_supported_versions_xtn);
client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_2,
SSL_LIBRARY_VERSION_TLS_1_3);
server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_2,
SSL_LIBRARY_VERSION_TLS_1_3);
ConnectExpectAlert(server_, kTlsAlertDecryptError);
client_->CheckErrorCode(SSL_ERROR_DECRYPT_ERROR_ALERT);
server_->CheckErrorCode(SSL_ERROR_BAD_HANDSHAKE_HASH_VALUE);
}
typedef std::tuple<SSLProtocolVariant,
uint16_t, // client version
uint16_t> // server version
TlsDowngradeProfile;
class TlsDowngradeTest
: public TlsConnectTestBase,
public ::testing::WithParamInterface<TlsDowngradeProfile> {
public:
TlsDowngradeTest()
: TlsConnectTestBase(std::get<0>(GetParam()), std::get<1>(GetParam())),
c_ver(std::get<1>(GetParam())),
s_ver(std::get<2>(GetParam())) {}
protected:
const uint16_t c_ver;
const uint16_t s_ver;
};
TEST_P(TlsDowngradeTest, TlsDowngradeSentinelTest) {
static const uint8_t tls12_downgrade_random[] = {0x44, 0x4F, 0x57, 0x4E,
0x47, 0x52, 0x44, 0x01};
static const uint8_t tls1_downgrade_random[] = {0x44, 0x4F, 0x57, 0x4E,
0x47, 0x52, 0x44, 0x00};
static const size_t kRandomLen = 32;
if (c_ver > s_ver) {
GTEST_SKIP();
}
client_->SetVersionRange(c_ver, c_ver);
server_->SetVersionRange(c_ver, s_ver);
auto sh = MakeTlsFilter<TlsHandshakeRecorder>(server_, ssl_hs_server_hello);
Connect();
ASSERT_TRUE(sh->buffer().len() > (kRandomLen + 2));
const uint8_t* downgrade_sentinel =
sh->buffer().data() + 2 + kRandomLen - sizeof(tls1_downgrade_random);
if (c_ver < s_ver) {
if (c_ver == SSL_LIBRARY_VERSION_TLS_1_2) {
EXPECT_EQ(0, memcmp(downgrade_sentinel, tls12_downgrade_random,
sizeof(tls12_downgrade_random)));
} else {
EXPECT_EQ(0, memcmp(downgrade_sentinel, tls1_downgrade_random,
sizeof(tls1_downgrade_random)));
}
} else {
EXPECT_NE(0, memcmp(downgrade_sentinel, tls12_downgrade_random,
sizeof(tls12_downgrade_random)));
EXPECT_NE(0, memcmp(downgrade_sentinel, tls1_downgrade_random,
sizeof(tls1_downgrade_random)));
}
}
// TLS 1.1 clients do not check the random values, so we should
// instead get a handshake failure alert from the server.
TEST_F(TlsConnectTest, TestDowngradeDetectionToTls10) {
// Setting the option here has no effect.
client_->SetOption(SSL_ENABLE_HELLO_DOWNGRADE_CHECK, PR_TRUE);
MakeTlsFilter<TlsMessageVersionSetter>(client_, kTlsHandshakeClientHello,
SSL_LIBRARY_VERSION_TLS_1_0);
client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_0,
SSL_LIBRARY_VERSION_TLS_1_1);
server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_0,
SSL_LIBRARY_VERSION_TLS_1_2);
ConnectExpectAlert(server_, kTlsAlertDecryptError);
server_->CheckErrorCode(SSL_ERROR_BAD_HANDSHAKE_HASH_VALUE);
client_->CheckErrorCode(SSL_ERROR_DECRYPT_ERROR_ALERT);
}
TEST_F(TlsConnectTest, TestFallbackFromTls12) {
client_->SetOption(SSL_ENABLE_HELLO_DOWNGRADE_CHECK, PR_TRUE);
client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
SSL_LIBRARY_VERSION_TLS_1_1);
server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
SSL_LIBRARY_VERSION_TLS_1_2);
client_->SetDowngradeCheckVersion(SSL_LIBRARY_VERSION_TLS_1_2);
ConnectExpectAlert(client_, kTlsAlertIllegalParameter);
client_->CheckErrorCode(SSL_ERROR_RX_MALFORMED_SERVER_HELLO);
server_->CheckErrorCode(SSL_ERROR_ILLEGAL_PARAMETER_ALERT);
}
static SECStatus AllowFalseStart(PRFileDesc* fd, void* arg,
PRBool* can_false_start) {
bool* false_start_attempted = reinterpret_cast<bool*>(arg);
*false_start_attempted = true;
*can_false_start = PR_TRUE;
return SECSuccess;
}
// If we disable the downgrade check, the sentinel is still generated, and we
// disable false start instead.
TEST_F(TlsConnectTest, DisableFalseStartOnFallback) {
// Don't call client_->EnableFalseStart(), because that sets the client up for
// success, and we want false start to fail.
client_->SetOption(SSL_ENABLE_FALSE_START, PR_TRUE);
bool false_start_attempted = false;
EXPECT_EQ(SECSuccess,
SSL_SetCanFalseStartCallback(client_->ssl_fd(), AllowFalseStart,
&false_start_attempted));
client_->SetOption(SSL_ENABLE_HELLO_DOWNGRADE_CHECK, PR_FALSE);
client_->SetDowngradeCheckVersion(SSL_LIBRARY_VERSION_TLS_1_3);
client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_2,
SSL_LIBRARY_VERSION_TLS_1_2);
server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_2,
SSL_LIBRARY_VERSION_TLS_1_3);
Connect();
EXPECT_FALSE(false_start_attempted);
}
TEST_F(TlsConnectTest, TestFallbackFromTls13) {
client_->SetOption(SSL_ENABLE_HELLO_DOWNGRADE_CHECK, PR_TRUE);
client_->SetDowngradeCheckVersion(SSL_LIBRARY_VERSION_TLS_1_3);
client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_2,
SSL_LIBRARY_VERSION_TLS_1_2);
server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
SSL_LIBRARY_VERSION_TLS_1_3);
ConnectExpectAlert(client_, kTlsAlertIllegalParameter);
client_->CheckErrorCode(SSL_ERROR_RX_MALFORMED_SERVER_HELLO);
server_->CheckErrorCode(SSL_ERROR_ILLEGAL_PARAMETER_ALERT);
}
TEST_P(TlsConnectGeneric, TestFallbackSCSVVersionMatch) {
client_->SetOption(SSL_ENABLE_FALLBACK_SCSV, PR_TRUE);
Connect();
}
TEST_P(TlsConnectGenericPre13, TestFallbackSCSVVersionMismatch) {
client_->SetOption(SSL_ENABLE_FALLBACK_SCSV, PR_TRUE);
server_->SetVersionRange(version_, version_ + 1);
ConnectExpectAlert(server_, kTlsAlertInappropriateFallback);
client_->CheckErrorCode(SSL_ERROR_INAPPROPRIATE_FALLBACK_ALERT);
server_->CheckErrorCode(SSL_ERROR_INAPPROPRIATE_FALLBACK_ALERT);
}
// The TLS v1.3 spec section C.4 states that 'Implementations MUST NOT send or
// accept any records with a version less than { 3, 0 }'. Thus we will not
// allow version ranges including both SSL v3 and TLS v1.3.
TEST_F(TlsConnectTest, DisallowSSLv3HelloWithTLSv13Enabled) {
SECStatus rv;
SSLVersionRange vrange = {SSL_LIBRARY_VERSION_3_0,
SSL_LIBRARY_VERSION_TLS_1_3};
EnsureTlsSetup();
rv = SSL_VersionRangeSet(client_->ssl_fd(), &vrange);
EXPECT_EQ(SECFailure, rv);
rv = SSL_VersionRangeSet(server_->ssl_fd(), &vrange);
EXPECT_EQ(SECFailure, rv);
}
TEST_P(TlsConnectGeneric, AlertBeforeServerHello) {
EnsureTlsSetup();
client_->ExpectReceiveAlert(kTlsAlertUnrecognizedName, kTlsAlertWarning);
StartConnect();
client_->Handshake(); // Send ClientHello.
static const uint8_t kWarningAlert[] = {kTlsAlertWarning,
kTlsAlertUnrecognizedName};
DataBuffer alert;
TlsAgentTestBase::MakeRecord(variant_, ssl_ct_alert,
SSL_LIBRARY_VERSION_TLS_1_0, kWarningAlert,
PR_ARRAY_SIZE(kWarningAlert), &alert);
client_->adapter()->PacketReceived(alert);
Handshake();
CheckConnected();
}
class Tls13NoSupportedVersions : public TlsConnectStreamTls12 {
protected:
void Run(uint16_t overwritten_client_version, uint16_t max_server_version) {
client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_2,
SSL_LIBRARY_VERSION_TLS_1_2);
server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_2, max_server_version);
MakeTlsFilter<TlsMessageVersionSetter>(client_, kTlsHandshakeClientHello,
overwritten_client_version);
auto capture =
MakeTlsFilter<TlsHandshakeRecorder>(server_, kTlsHandshakeServerHello);
ConnectExpectAlert(server_, kTlsAlertDecryptError);
client_->CheckErrorCode(SSL_ERROR_DECRYPT_ERROR_ALERT);
server_->CheckErrorCode(SSL_ERROR_BAD_HANDSHAKE_HASH_VALUE);
const DataBuffer& server_hello = capture->buffer();
ASSERT_GT(server_hello.len(), 2U);
uint32_t ver;
ASSERT_TRUE(server_hello.Read(0, 2, &ver));
ASSERT_EQ(static_cast<uint32_t>(SSL_LIBRARY_VERSION_TLS_1_2), ver);
}
};
// If we offer a 1.3 ClientHello w/o supported_versions, the server should
// negotiate 1.2.
TEST_F(Tls13NoSupportedVersions,
Tls13ClientHelloWithoutSupportedVersionsServer12) {
Run(SSL_LIBRARY_VERSION_TLS_1_3, SSL_LIBRARY_VERSION_TLS_1_2);
}
TEST_F(Tls13NoSupportedVersions,
Tls13ClientHelloWithoutSupportedVersionsServer13) {
Run(SSL_LIBRARY_VERSION_TLS_1_3, SSL_LIBRARY_VERSION_TLS_1_3);
}
TEST_F(Tls13NoSupportedVersions,
Tls14ClientHelloWithoutSupportedVersionsServer13) {
Run(SSL_LIBRARY_VERSION_TLS_1_3 + 1, SSL_LIBRARY_VERSION_TLS_1_3);
}
// Offer 1.3 but with ClientHello.legacy_version == TLS 1.4. This
// causes a bad MAC error when we read EncryptedExtensions.
TEST_F(TlsConnectStreamTls13, Tls14ClientHelloWithSupportedVersions) {
MakeTlsFilter<TlsMessageVersionSetter>(client_, kTlsHandshakeClientHello,
SSL_LIBRARY_VERSION_TLS_1_3 + 1);
auto capture = MakeTlsFilter<TlsExtensionCapture>(
server_, ssl_tls13_supported_versions_xtn);
client_->ExpectSendAlert(kTlsAlertBadRecordMac);
server_->ExpectSendAlert(kTlsAlertBadRecordMac);
ConnectExpectFail();
client_->CheckErrorCode(SSL_ERROR_BAD_MAC_READ);
server_->CheckErrorCode(SSL_ERROR_BAD_MAC_READ);
ASSERT_EQ(2U, capture->extension().len());
uint32_t version = 0;
ASSERT_TRUE(capture->extension().Read(0, 2, &version));
// This way we don't need to change with new draft version.
ASSERT_LT(static_cast<uint32_t>(SSL_LIBRARY_VERSION_TLS_1_2), version);
}
// Offer 1.3 but with Server/ClientHello.legacy_version == SSL 3.0. This
// causes a protocol version alert. See RFC 8446 Appendix D.5.
TEST_F(TlsConnectStreamTls13, Ssl30ClientHelloWithSupportedVersions) {
MakeTlsFilter<TlsMessageVersionSetter>(client_, kTlsHandshakeClientHello,
SSL_LIBRARY_VERSION_3_0);
ConnectExpectAlert(server_, kTlsAlertProtocolVersion);
}
TEST_F(TlsConnectStreamTls13, Ssl30ServerHelloWithSupportedVersions) {
MakeTlsFilter<TlsMessageVersionSetter>(server_, kTlsHandshakeServerHello,
SSL_LIBRARY_VERSION_3_0);
StartConnect();
client_->ExpectSendAlert(kTlsAlertProtocolVersion);
/* Since the handshake is not finished the client will send an unencrypted
* alert. The server is expected to close the connection with a unexpected
* message alert. */
server_->ExpectSendAlert(kTlsAlertUnexpectedMessage);
Handshake();
}
// Verify the client sends only DTLS versions in supported_versions
TEST_F(DtlsConnectTest, DtlsSupportedVersionsEncoding) {
client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
SSL_LIBRARY_VERSION_TLS_1_3);
server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
SSL_LIBRARY_VERSION_TLS_1_3);
auto capture = MakeTlsFilter<TlsExtensionCapture>(
client_, ssl_tls13_supported_versions_xtn);
Connect();
ASSERT_EQ(7U, capture->extension().len());
uint32_t version = 0;
ASSERT_TRUE(capture->extension().Read(1, 2, &version));
EXPECT_EQ(SSL_LIBRARY_VERSION_DTLS_1_3_WIRE, static_cast<int>(version));
ASSERT_TRUE(capture->extension().Read(3, 2, &version));
EXPECT_EQ(SSL_LIBRARY_VERSION_DTLS_1_2_WIRE, static_cast<int>(version));
ASSERT_TRUE(capture->extension().Read(5, 2, &version));
EXPECT_EQ(SSL_LIBRARY_VERSION_DTLS_1_0_WIRE, static_cast<int>(version));
}
// Verify the DTLS 1.3 supported_versions interop workaround.
TEST_F(DtlsConnectTest, Dtls13VersionWorkaround) {
static const uint16_t kExpectVersionsWorkaround[] = {
SSL_LIBRARY_VERSION_DTLS_1_3_WIRE, SSL_LIBRARY_VERSION_DTLS_1_2_WIRE,
SSL_LIBRARY_VERSION_TLS_1_2, SSL_LIBRARY_VERSION_DTLS_1_0_WIRE,
SSL_LIBRARY_VERSION_TLS_1_1};
const int min_ver = SSL_LIBRARY_VERSION_TLS_1_1,
max_ver = SSL_LIBRARY_VERSION_TLS_1_3;
// Toggle the workaround, then verify both encodings are present.
EnsureTlsSetup();
SSL_SetDtls13VersionWorkaround(client_->ssl_fd(), PR_TRUE);
SSL_SetDtls13VersionWorkaround(client_->ssl_fd(), PR_FALSE);
SSL_SetDtls13VersionWorkaround(client_->ssl_fd(), PR_TRUE);
client_->SetVersionRange(min_ver, max_ver);
server_->SetVersionRange(min_ver, max_ver);
auto capture = MakeTlsFilter<TlsExtensionCapture>(
client_, ssl_tls13_supported_versions_xtn);
Connect();
uint32_t version = 0;
size_t off = 1;
ASSERT_EQ(1 + sizeof(kExpectVersionsWorkaround), capture->extension().len());
for (unsigned int i = 0; i < PR_ARRAY_SIZE(kExpectVersionsWorkaround); i++) {
ASSERT_TRUE(capture->extension().Read(off, 2, &version));
EXPECT_EQ(kExpectVersionsWorkaround[i], static_cast<uint16_t>(version));
off += 2;
}
}
// Verify the client sends only TLS versions in supported_versions
TEST_F(TlsConnectTest, TlsSupportedVersionsEncoding) {
client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_0,
SSL_LIBRARY_VERSION_TLS_1_3);
server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_0,
SSL_LIBRARY_VERSION_TLS_1_3);
auto capture = MakeTlsFilter<TlsExtensionCapture>(
client_, ssl_tls13_supported_versions_xtn);
Connect();
ASSERT_EQ(9U, capture->extension().len());
uint32_t version = 0;
ASSERT_TRUE(capture->extension().Read(1, 2, &version));
EXPECT_EQ(SSL_LIBRARY_VERSION_TLS_1_3, static_cast<int>(version));
ASSERT_TRUE(capture->extension().Read(3, 2, &version));
EXPECT_EQ(SSL_LIBRARY_VERSION_TLS_1_2, static_cast<int>(version));
ASSERT_TRUE(capture->extension().Read(5, 2, &version));
EXPECT_EQ(SSL_LIBRARY_VERSION_TLS_1_1, static_cast<int>(version));
ASSERT_TRUE(capture->extension().Read(7, 2, &version));
EXPECT_EQ(SSL_LIBRARY_VERSION_TLS_1_0, static_cast<int>(version));
}
/* Test that on reception of unsupported ClientHello.legacy_version the TLS 1.3
* server sends the correct alert.
*
* If the "supported_versions" extension is absent and the server only supports
* versions greater than ClientHello.legacy_version, the server MUST abort the
* handshake with a "protocol_version" alert [RFC8446, Appendix D.2]. */
TEST_P(TlsConnectGenericPre13, ClientHelloUnsupportedTlsVersion) {
StartConnect();
if (variant_ == ssl_variant_stream) {
server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_3,
SSL_LIBRARY_VERSION_TLS_1_3);
} else {
server_->SetVersionRange(SSL_LIBRARY_VERSION_DTLS_1_3,
SSL_LIBRARY_VERSION_DTLS_1_3);
}
// Try to handshake
client_->Handshake();
// Expect protocol version alert
server_->ExpectSendAlert(kTlsAlertProtocolVersion);
server_->Handshake();
// Digest alert at peer
client_->ExpectReceiveAlert(kTlsAlertProtocolVersion);
client_->ReadBytes();
}
INSTANTIATE_TEST_SUITE_P(
TlsDowngradeSentinelTest, TlsDowngradeTest,
::testing::Combine(TlsConnectTestBase::kTlsVariantsStream,
TlsConnectTestBase::kTlsVAll,
TlsConnectTestBase::kTlsV12Plus));
} // namespace nss_test