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Commit 8f04b0ca authored by Joshua Duong's avatar Joshua Duong Committed by Gerrit Code Review
Browse files

Merge "Some minor fixes to libadb_tls_connection."

parents 9d261c3f 663b3c9d

adb/tls/adb_ca_list.cpp

+18 −12
Original line number Diff line number Diff line
@@ -32,13 +32,13 @@ namespace { 
// CA issuer identifier to distinguished embedded keys. Also has version

// information appended to the end of the string (e.g. "AdbKey-0").

static constexpr int kAdbKeyIdentifierNid = NID_organizationName;

static constexpr char kAdbKeyIdentifierPrefix[] = "AdbKey-";

static constexpr int kAdbKeyVersion = 0;

static constexpr char kAdbKeyIdentifierV0[] = "AdbKey-0";



// Where we store the actual data

static constexpr int kAdbKeyValueNid = NID_commonName;



// TODO: Remove this once X509_NAME_add_entry_by_NID is fixed to use const unsigned char*

// https://boringssl-review.googlesource.com/c/boringssl/+/39764

int X509_NAME_add_entry_by_NID_const(X509_NAME* name, int nid, int type, const unsigned char* bytes,

                                     int len, int loc, int set) {

    return X509_NAME_add_entry_by_NID(name, nid, type, const_cast<unsigned char*>(bytes), len, loc,
@@ -55,13 +55,13 @@ std::optional<std::string> GetX509NameTextByNid(X509_NAME* name, int nid) { 
    // |len| is the len of the text excluding the final null

    int len = X509_NAME_get_text_by_NID(name, nid, nullptr, -1);

    if (len <= 0) {

        return {};

        return std::nullopt;

    }



    // Include the space for the final null byte

    std::vector<char> buf(len + 1, '\0');

    CHECK(X509_NAME_get_text_by_NID(name, nid, buf.data(), buf.size()));

    return buf.data();

    return std::make_optional(std::string(buf.data()));

}



}  // namespace
@@ -73,8 +73,7 @@ bssl::UniquePtr<X509_NAME> CreateCAIssuerFromEncodedKey(std::string_view key) { 
    // "O=AdbKey-0;CN=<key>;"

    CHECK(!key.empty());



    std::string identifier = kAdbKeyIdentifierPrefix;

    identifier += std::to_string(kAdbKeyVersion);

    std::string identifier = kAdbKeyIdentifierV0;

    bssl::UniquePtr<X509_NAME> name(X509_NAME_new());

    CHECK(X509_NAME_add_entry_by_NID_const(name.get(), kAdbKeyIdentifierNid, MBSTRING_ASC,

                                           reinterpret_cast<const uint8_t*>(identifier.data()),
@@ -91,27 +90,34 @@ std::optional<std::string> ParseEncodedKeyFromCAIssuer(X509_NAME* issuer) { 
    CHECK(issuer);



    auto buf = GetX509NameTextByNid(issuer, kAdbKeyIdentifierNid);

    if (!buf || !android::base::StartsWith(*buf, kAdbKeyIdentifierPrefix)) {

        return {};

    if (!buf) {

        return std::nullopt;

    }



    // Check for supported versions

    if (*buf == kAdbKeyIdentifierV0) {

        return GetX509NameTextByNid(issuer, kAdbKeyValueNid);

    }

    return std::nullopt;

}



std::string SHA256BitsToHexString(std::string_view sha256) {

    CHECK_EQ(sha256.size(), static_cast<size_t>(SHA256_DIGEST_LENGTH));

    std::stringstream ss;

    auto* u8 = reinterpret_cast<const uint8_t*>(sha256.data());

    ss << std::uppercase << std::setfill('0') << std::hex;

    // Convert to hex-string representation

    for (size_t i = 0; i < SHA256_DIGEST_LENGTH; ++i) {

        ss << std::setw(2) << (0x00FF & sha256[i]);

        // Need to cast to something bigger than one byte, or

        // stringstream will interpret it as a char value.

        ss << std::setw(2) << static_cast<uint16_t>(u8[i]);

    }

    return ss.str();

}



std::optional<std::string> SHA256HexStringToBits(std::string_view sha256_str) {

    if (sha256_str.size() != SHA256_DIGEST_LENGTH * 2) {

        return {};

        return std::nullopt;

    }



    std::string result;
@@ -119,7 +125,7 @@ std::optional<std::string> SHA256HexStringToBits(std::string_view sha256_str) { 
        auto bytestr = std::string(sha256_str.substr(i * 2, 2));

        if (!IsHexDigit(bytestr[0]) || !IsHexDigit(bytestr[1])) {

            LOG(ERROR) << "SHA256 string has invalid non-hex chars";

            return {};

            return std::nullopt;

        }

        result += static_cast<char>(std::stol(bytestr, nullptr, 16));

    }

adb/tls/include/adb/tls/tls_connection.h

+4 −5
Original line number Diff line number Diff line
@@ -55,16 +55,15 @@ class TlsConnection { 


    // Adds a trusted certificate to the list for the SSL connection.

    // During the handshake phase, it will check the list of trusted certificates.

    // The connection will fail if the peer's certificate is not in the list. Use

    // |EnableCertificateVerification(false)| to disable certificate

    // verification.

    // The connection will fail if the peer's certificate is not in the list. If

    // you would like to accept any certificate, use #SetCertVerifyCallback and

    // set your callback to always return 1.

    //

    // Returns true if |cert| was successfully added, false otherwise.

    virtual bool AddTrustedCertificate(std::string_view cert) = 0;



    // Sets a custom certificate verify callback. |cb| must return 1 if the

    // certificate is trusted. Otherwise, return 0 if not. Note that |cb| is

    // only used if EnableCertificateVerification(false).

    // certificate is trusted. Otherwise, return 0 if not.

    virtual void SetCertVerifyCallback(CertVerifyCb cb) = 0;



    // Configures a client |ca_list| that the server sends to the client in the

adb/tls/tests/tls_connection_test.cpp

+82 −90
Original line number Diff line number Diff line
@@ -199,24 +199,10 @@ using CAIssuer = std::vector<CAIssuerField>; 
static std::vector<CAIssuer> kCAIssuers = {

        {

                {NID_commonName, {'a', 'b', 'c', 'd', 'e'}},

                {NID_organizationName,

                 {

                         'd',

                         'e',

                         'f',

                         'g',

                 }},

                {NID_organizationName, {'d', 'e', 'f', 'g'}},

        },

        {

                {NID_commonName,

                 {

                         'h',

                         'i',

                         'j',

                         'k',

                         'l',

                         'm',

                 }},

                {NID_commonName, {'h', 'i', 'j', 'k', 'l', 'm'}},

                {NID_countryName, {'n', 'o'}},

        },

};
@@ -224,8 +210,6 @@ static std::vector<CAIssuer> kCAIssuers = { 
class AdbWifiTlsConnectionTest : public testing::Test {

  protected:

    virtual void SetUp() override {

        // TODO: move client code in each test into its own thread, as the

        // socket pair buffer is limited.

        android::base::Socketpair(SOCK_STREAM, &server_fd_, &client_fd_);

        server_ = TlsConnection::Create(TlsConnection::Role::Server, kTestRsa2048ServerCert,

                                        kTestRsa2048ServerPrivKey, server_fd_);
@@ -257,14 +241,8 @@ class AdbWifiTlsConnectionTest : public testing::Test { 
        return ret;

    }



    void StartClientHandshakeAsync(bool expect_success) {

        client_thread_ = std::thread([=]() {

            if (expect_success) {

                EXPECT_EQ(client_->DoHandshake(), TlsError::Success);

            } else {

                EXPECT_NE(client_->DoHandshake(), TlsError::Success);

            }

        });

    void StartClientHandshakeAsync(TlsError expected) {

        client_thread_ = std::thread([=]() { EXPECT_EQ(client_->DoHandshake(), expected); });

    }



    void WaitForClientConnection() {
@@ -313,45 +291,52 @@ TEST_F(AdbWifiTlsConnectionTest, NoCertificateVerification) { 
    // Allow any certificate

    server_->SetCertVerifyCallback([](X509_STORE_CTX*) { return 1; });

    client_->SetCertVerifyCallback([](X509_STORE_CTX*) { return 1; });

    StartClientHandshakeAsync(true);

    StartClientHandshakeAsync(TlsError::Success);



    // Handshake should succeed

    EXPECT_EQ(server_->DoHandshake(), TlsError::Success);

    ASSERT_EQ(server_->DoHandshake(), TlsError::Success);

    WaitForClientConnection();



    // Client write, server read

    // Test client/server read and writes

    client_thread_ = std::thread([&]() {

        EXPECT_TRUE(client_->WriteFully(

                std::string_view(reinterpret_cast<const char*>(msg_.data()), msg_.size())));

    auto data = server_->ReadFully(msg_.size());

    EXPECT_EQ(data, msg_);



    // Client read, server write

    EXPECT_TRUE(server_->WriteFully(

            std::string_view(reinterpret_cast<const char*>(msg_.data()), msg_.size())));

        // Try with overloaded ReadFully

        std::vector<uint8_t> buf(msg_.size());

        ASSERT_TRUE(client_->ReadFully(buf.data(), msg_.size()));

        EXPECT_EQ(buf, msg_);

    });



    auto data = server_->ReadFully(msg_.size());

    EXPECT_EQ(data, msg_);

    EXPECT_TRUE(server_->WriteFully(

            std::string_view(reinterpret_cast<const char*>(msg_.data()), msg_.size())));



    WaitForClientConnection();

}



TEST_F(AdbWifiTlsConnectionTest, NoTrustedCertificates) {

    StartClientHandshakeAsync(false);

    StartClientHandshakeAsync(TlsError::CertificateRejected);



    // Handshake should not succeed

    EXPECT_NE(server_->DoHandshake(), TlsError::Success);

    ASSERT_EQ(server_->DoHandshake(), TlsError::PeerRejectedCertificate);

    WaitForClientConnection();



    // All writes and reads should fail

    client_thread_ = std::thread([&]() {

        // Client write, server read should fail

        EXPECT_FALSE(client_->WriteFully(

                std::string_view(reinterpret_cast<const char*>(msg_.data()), msg_.size())));

    auto data = server_->ReadFully(msg_.size());

        auto data = client_->ReadFully(msg_.size());

        EXPECT_EQ(data.size(), 0);

    });



    // Client read, server write should fail

    auto data = server_->ReadFully(msg_.size());

    EXPECT_EQ(data.size(), 0);

    EXPECT_FALSE(server_->WriteFully(

            std::string_view(reinterpret_cast<const char*>(msg_.data()), msg_.size())));

    data = client_->ReadFully(msg_.size());

    EXPECT_EQ(data.size(), 0);



    WaitForClientConnection();

}



TEST_F(AdbWifiTlsConnectionTest, AddTrustedCertificates) {
@@ -359,23 +344,26 @@ TEST_F(AdbWifiTlsConnectionTest, AddTrustedCertificates) { 
    EXPECT_TRUE(client_->AddTrustedCertificate(kTestRsa2048ServerCert));

    EXPECT_TRUE(server_->AddTrustedCertificate(kTestRsa2048ClientCert));



    StartClientHandshakeAsync(true);

    StartClientHandshakeAsync(TlsError::Success);



    // Handshake should succeed

    EXPECT_EQ(server_->DoHandshake(), TlsError::Success);

    ASSERT_EQ(server_->DoHandshake(), TlsError::Success);

    WaitForClientConnection();



    // Client write, server read

    // All read writes should succeed

    client_thread_ = std::thread([&]() {

        EXPECT_TRUE(client_->WriteFully(

                std::string_view(reinterpret_cast<const char*>(msg_.data()), msg_.size())));

    auto data = server_->ReadFully(msg_.size());

        auto data = client_->ReadFully(msg_.size());

        EXPECT_EQ(data, msg_);

    });



    // Client read, server write

    auto data = server_->ReadFully(msg_.size());

    EXPECT_EQ(data, msg_);

    EXPECT_TRUE(server_->WriteFully(

            std::string_view(reinterpret_cast<const char*>(msg_.data()), msg_.size())));

    data = client_->ReadFully(msg_.size());

    EXPECT_EQ(data, msg_);



    WaitForClientConnection();

}



TEST_F(AdbWifiTlsConnectionTest, AddTrustedCertificates_ClientWrongCert) {
@@ -387,23 +375,26 @@ TEST_F(AdbWifiTlsConnectionTest, AddTrustedCertificates_ClientWrongCert) { 
    // Without enabling EnableClientPostHandshakeCheck(), DoHandshake() will

    // succeed, because in TLS 1.3, the client doesn't get notified if the

    // server rejected the certificate until a read operation is called.

    StartClientHandshakeAsync(true);

    StartClientHandshakeAsync(TlsError::Success);



    // Handshake should fail for server, succeed for client

    EXPECT_NE(server_->DoHandshake(), TlsError::Success);

    ASSERT_EQ(server_->DoHandshake(), TlsError::CertificateRejected);

    WaitForClientConnection();



    // Client write succeeds, server read should fail

    // Client writes will succeed, everything else will fail.

    client_thread_ = std::thread([&]() {

        EXPECT_TRUE(client_->WriteFully(

                std::string_view(reinterpret_cast<const char*>(msg_.data()), msg_.size())));

    auto data = server_->ReadFully(msg_.size());

        auto data = client_->ReadFully(msg_.size());

        EXPECT_EQ(data.size(), 0);

    });



    // Client read, server write should fail

    auto data = server_->ReadFully(msg_.size());

    EXPECT_EQ(data.size(), 0);

    EXPECT_FALSE(server_->WriteFully(

            std::string_view(reinterpret_cast<const char*>(msg_.data()), msg_.size())));

    data = client_->ReadFully(msg_.size());

    EXPECT_EQ(data.size(), 0);



    WaitForClientConnection();

}



TEST_F(AdbWifiTlsConnectionTest, ExportKeyingMaterial) {
@@ -415,10 +406,10 @@ TEST_F(AdbWifiTlsConnectionTest, ExportKeyingMaterial) { 
    EXPECT_TRUE(client_->AddTrustedCertificate(kTestRsa2048ServerCert));

    EXPECT_TRUE(server_->AddTrustedCertificate(kTestRsa2048ClientCert));



    StartClientHandshakeAsync(true);

    StartClientHandshakeAsync(TlsError::Success);



    // Handshake should succeed

    EXPECT_EQ(server_->DoHandshake(), TlsError::Success);

    ASSERT_EQ(server_->DoHandshake(), TlsError::Success);

    WaitForClientConnection();



    // Verify the client and server's exported key material match.
@@ -439,10 +430,10 @@ TEST_F(AdbWifiTlsConnectionTest, SetCertVerifyCallback_ClientAcceptsServerReject 
    // Client handshake should succeed, because in TLS 1.3, client does not

    // realize that the peer rejected the certificate until after a read

    // operation.

    client_thread_ = std::thread([&]() { EXPECT_EQ(client_->DoHandshake(), TlsError::Success); });

    StartClientHandshakeAsync(TlsError::Success);



    // Server handshake should fail

    EXPECT_EQ(server_->DoHandshake(), TlsError::CertificateRejected);

    ASSERT_EQ(server_->DoHandshake(), TlsError::CertificateRejected);

    WaitForClientConnection();

}
@@ -455,11 +446,10 @@ TEST_F(AdbWifiTlsConnectionTest, SetCertVerifyCallback_ClientAcceptsServerReject 
    server_->SetCertVerifyCallback([](X509_STORE_CTX*) { return 0; });



    // Client handshake should fail because server rejects everything

    client_thread_ = std::thread(

            [&]() { EXPECT_EQ(client_->DoHandshake(), TlsError::PeerRejectedCertificate); });

    StartClientHandshakeAsync(TlsError::PeerRejectedCertificate);



    // Server handshake should fail

    EXPECT_EQ(server_->DoHandshake(), TlsError::CertificateRejected);

    ASSERT_EQ(server_->DoHandshake(), TlsError::CertificateRejected);

    WaitForClientConnection();

}
@@ -469,11 +459,10 @@ TEST_F(AdbWifiTlsConnectionTest, SetCertVerifyCallback_ClientRejectsServerAccept 
    // Server accepts all

    server_->SetCertVerifyCallback([](X509_STORE_CTX*) { return 1; });

    // Client handshake should fail

    client_thread_ = std::thread(

            [&]() { EXPECT_EQ(client_->DoHandshake(), TlsError::CertificateRejected); });

    StartClientHandshakeAsync(TlsError::CertificateRejected);



    // Server handshake should fail

    EXPECT_EQ(server_->DoHandshake(), TlsError::PeerRejectedCertificate);

    ASSERT_EQ(server_->DoHandshake(), TlsError::PeerRejectedCertificate);

    WaitForClientConnection();

}
@@ -488,15 +477,15 @@ TEST_F(AdbWifiTlsConnectionTest, SetCertVerifyCallback_ClientRejectsServerAccept 
    server_->SetCertVerifyCallback([](X509_STORE_CTX*) { return 1; });



    // Client handshake should fail

    client_thread_ = std::thread(

            [&]() { EXPECT_EQ(client_->DoHandshake(), TlsError::CertificateRejected); });

    StartClientHandshakeAsync(TlsError::CertificateRejected);



    // Server handshake should fail

    EXPECT_EQ(server_->DoHandshake(), TlsError::PeerRejectedCertificate);

    ASSERT_EQ(server_->DoHandshake(), TlsError::PeerRejectedCertificate);

    WaitForClientConnection();

}



TEST_F(AdbWifiTlsConnectionTest, EnableClientPostHandshakeCheck_ClientWrongCert) {

    client_->AddTrustedCertificate(kTestRsa2048ServerCert);

    // client's DoHandshake() will fail if the server rejected the certificate

    client_->EnableClientPostHandshakeCheck(true);
@@ -504,23 +493,26 @@ TEST_F(AdbWifiTlsConnectionTest, EnableClientPostHandshakeCheck_ClientWrongCert) 
    EXPECT_TRUE(server_->AddTrustedCertificate(kTestRsa2048UnknownCert));



    // Handshake should fail for client

    StartClientHandshakeAsync(false);

    StartClientHandshakeAsync(TlsError::PeerRejectedCertificate);



    // Handshake should fail for server

    EXPECT_NE(server_->DoHandshake(), TlsError::Success);

    ASSERT_EQ(server_->DoHandshake(), TlsError::CertificateRejected);

    WaitForClientConnection();



    // Client write fails, server read should fail

    // All read writes should fail

    client_thread_ = std::thread([&]() {

        EXPECT_FALSE(client_->WriteFully(

                std::string_view(reinterpret_cast<const char*>(msg_.data()), msg_.size())));

    auto data = server_->ReadFully(msg_.size());

        auto data = client_->ReadFully(msg_.size());

        EXPECT_EQ(data.size(), 0);

    });



    // Client read, server write should fail

    auto data = server_->ReadFully(msg_.size());

    EXPECT_EQ(data.size(), 0);

    EXPECT_FALSE(server_->WriteFully(

            std::string_view(reinterpret_cast<const char*>(msg_.data()), msg_.size())));

    data = client_->ReadFully(msg_.size());

    EXPECT_EQ(data.size(), 0);



    WaitForClientConnection();

}



TEST_F(AdbWifiTlsConnectionTest, SetClientCAList_Empty) {
@@ -569,12 +561,12 @@ TEST_F(AdbWifiTlsConnectionTest, SetClientCAList_Smoke) { 
            return 1;

        });

        // Client handshake should succeed

        EXPECT_EQ(client_->DoHandshake(), TlsError::Success);

        ASSERT_EQ(client_->DoHandshake(), TlsError::Success);

    });



    EXPECT_TRUE(server_->AddTrustedCertificate(kTestRsa2048UnknownCert));

    // Server handshake should succeed

    EXPECT_EQ(server_->DoHandshake(), TlsError::Success);

    ASSERT_EQ(server_->DoHandshake(), TlsError::Success);

    client_thread_.join();

}
@@ -604,12 +596,12 @@ TEST_F(AdbWifiTlsConnectionTest, SetClientCAList_AdbCAList) { 
            return 1;

        });

        // Client handshake should succeed

        EXPECT_EQ(client_->DoHandshake(), TlsError::Success);

        ASSERT_EQ(client_->DoHandshake(), TlsError::Success);

    });



    server_->SetCertVerifyCallback([](X509_STORE_CTX*) { return 1; });

    // Server handshake should succeed

    EXPECT_EQ(server_->DoHandshake(), TlsError::Success);

    ASSERT_EQ(server_->DoHandshake(), TlsError::Success);

    client_thread_.join();

}

}  // namespace tls

adb/tls/tls_connection.cpp

+27 −20
Original line number Diff line number Diff line
@@ -61,6 +61,7 @@ class TlsConnectionImpl : public TlsConnection { 
    static const char* SSLErrorString();

    void Invalidate();

    TlsError GetFailureReason(int err);

    const char* RoleToString() { return role_ == Role::Server ? kServerRoleStr : kClientRoleStr; }



    Role role_;

    bssl::UniquePtr<EVP_PKEY> priv_key_;
@@ -75,15 +76,19 @@ class TlsConnectionImpl : public TlsConnection { 
    CertVerifyCb cert_verify_cb_;

    SetCertCb set_cert_cb_;

    borrowed_fd fd_;

    static constexpr char kClientRoleStr[] = "[client]: ";

    static constexpr char kServerRoleStr[] = "[server]: ";

};  // TlsConnectionImpl



TlsConnectionImpl::TlsConnectionImpl(Role role, std::string_view cert, std::string_view priv_key,

                                     borrowed_fd fd)

    : role_(role), fd_(fd) {

    CHECK(!cert.empty() && !priv_key.empty());

    LOG(INFO) << "Initializing adbwifi TlsConnection";

    LOG(INFO) << RoleToString() << "Initializing adbwifi TlsConnection";

    cert_ = BufferFromPEM(cert);

    CHECK(cert_);

    priv_key_ = EvpPkeyFromPEM(priv_key);

    CHECK(priv_key_);

}



TlsConnectionImpl::~TlsConnectionImpl() {
@@ -149,7 +154,7 @@ bool TlsConnectionImpl::AddTrustedCertificate(std::string_view cert) { 
    // Create X509 buffer from the certificate string

    auto buf = X509FromBuffer(BufferFromPEM(cert));

    if (buf == nullptr) {

        LOG(ERROR) << "Failed to create a X509 buffer for the certificate.";

        LOG(ERROR) << RoleToString() << "Failed to create a X509 buffer for the certificate.";

        return false;

    }

    known_certificates_.push_back(std::move(buf));
@@ -205,8 +210,7 @@ TlsConnection::TlsError TlsConnectionImpl::GetFailureReason(int err) { 
}



TlsConnection::TlsError TlsConnectionImpl::DoHandshake() {

    int err = -1;

    LOG(INFO) << "Starting adbwifi tls handshake";

    LOG(INFO) << RoleToString() << "Starting adbwifi tls handshake";

    ssl_ctx_.reset(SSL_CTX_new(TLS_method()));

    // TODO: Remove set_max_proto_version() once external/boringssl is updated

    // past
@@ -214,14 +218,14 @@ TlsConnection::TlsError TlsConnectionImpl::DoHandshake() { 
    if (ssl_ctx_.get() == nullptr ||

        !SSL_CTX_set_min_proto_version(ssl_ctx_.get(), TLS1_3_VERSION) ||

        !SSL_CTX_set_max_proto_version(ssl_ctx_.get(), TLS1_3_VERSION)) {

        LOG(ERROR) << "Failed to create SSL context";

        LOG(ERROR) << RoleToString() << "Failed to create SSL context";

        return TlsError::UnknownFailure;

    }



    // Register user-supplied known certificates

    for (auto const& cert : known_certificates_) {

        if (X509_STORE_add_cert(SSL_CTX_get_cert_store(ssl_ctx_.get()), cert.get()) == 0) {

            LOG(ERROR) << "Unable to add certificates into the X509_STORE";

            LOG(ERROR) << RoleToString() << "Unable to add certificates into the X509_STORE";

            return TlsError::UnknownFailure;

        }

    }
@@ -248,7 +252,8 @@ TlsConnection::TlsError TlsConnectionImpl::DoHandshake() { 
    };

    if (!SSL_CTX_set_chain_and_key(ssl_ctx_.get(), cert_chain.data(), cert_chain.size(),

                                   priv_key_.get(), nullptr)) {

        LOG(ERROR) << "Unable to register the certificate chain file and private key ["

        LOG(ERROR) << RoleToString()

                   << "Unable to register the certificate chain file and private key ["

                   << SSLErrorString() << "]";

        Invalidate();

        return TlsError::UnknownFailure;
@@ -259,19 +264,21 @@ TlsConnection::TlsError TlsConnectionImpl::DoHandshake() { 
    // Okay! Let's try to do the handshake!

    ssl_.reset(SSL_new(ssl_ctx_.get()));

    if (!SSL_set_fd(ssl_.get(), fd_.get())) {

        LOG(ERROR) << "SSL_set_fd failed. [" << SSLErrorString() << "]";

        LOG(ERROR) << RoleToString() << "SSL_set_fd failed. [" << SSLErrorString() << "]";

        return TlsError::UnknownFailure;

    }



    switch (role_) {

        case Role::Server:

            err = SSL_accept(ssl_.get());

            SSL_set_accept_state(ssl_.get());

            break;

        case Role::Client:

            err = SSL_connect(ssl_.get());

            SSL_set_connect_state(ssl_.get());

            break;

    }

    if (err != 1) {

        LOG(ERROR) << "Handshake failed in SSL_accept/SSL_connect [" << SSLErrorString() << "]";

    if (SSL_do_handshake(ssl_.get()) != 1) {

        LOG(ERROR) << RoleToString() << "Handshake failed in SSL_accept/SSL_connect ["

                   << SSLErrorString() << "]";

        auto sslerr = ERR_get_error();

        Invalidate();

        return GetFailureReason(sslerr);
@@ -281,16 +288,16 @@ TlsConnection::TlsError TlsConnectionImpl::DoHandshake() { 
        uint8_t check;

        // Try to peek one byte for any failures. This assumes on success that

        // the server actually sends something.

        err = SSL_peek(ssl_.get(), &check, 1);

        if (err <= 0) {

            LOG(ERROR) << "Post-handshake SSL_peek failed [" << SSLErrorString() << "]";

        if (SSL_peek(ssl_.get(), &check, 1) <= 0) {

            LOG(ERROR) << RoleToString() << "Post-handshake SSL_peek failed [" << SSLErrorString()

                       << "]";

            auto sslerr = ERR_get_error();

            Invalidate();

            return GetFailureReason(sslerr);

        }

    }



    LOG(INFO) << "Handshake succeeded.";

    LOG(INFO) << RoleToString() << "Handshake succeeded.";

    return TlsError::Success;

}
@@ -311,7 +318,7 @@ std::vector<uint8_t> TlsConnectionImpl::ReadFully(size_t size) { 
bool TlsConnectionImpl::ReadFully(void* buf, size_t size) {

    CHECK_GT(size, 0U);

    if (!ssl_) {

        LOG(ERROR) << "Tried to read on a null SSL connection";

        LOG(ERROR) << RoleToString() << "Tried to read on a null SSL connection";

        return false;

    }
@@ -321,7 +328,7 @@ bool TlsConnectionImpl::ReadFully(void* buf, size_t size) { 
        int bytes_read =

                SSL_read(ssl_.get(), p8 + offset, std::min(static_cast<size_t>(INT_MAX), size));

        if (bytes_read <= 0) {

            LOG(WARNING) << "SSL_read failed [" << SSLErrorString() << "]";

            LOG(ERROR) << RoleToString() << "SSL_read failed [" << SSLErrorString() << "]";

            return false;

        }

        size -= bytes_read;
@@ -333,7 +340,7 @@ bool TlsConnectionImpl::ReadFully(void* buf, size_t size) { 
bool TlsConnectionImpl::WriteFully(std::string_view data) {

    CHECK(!data.empty());

    if (!ssl_) {

        LOG(ERROR) << "Tried to read on a null SSL connection";

        LOG(ERROR) << RoleToString() << "Tried to read on a null SSL connection";

        return false;

    }
@@ -341,7 +348,7 @@ bool TlsConnectionImpl::WriteFully(std::string_view data) { 
        int bytes_out = SSL_write(ssl_.get(), data.data(),

                                  std::min(static_cast<size_t>(INT_MAX), data.size()));

        if (bytes_out <= 0) {

            LOG(WARNING) << "SSL_write failed [" << SSLErrorString() << "]";

            LOG(ERROR) << RoleToString() << "SSL_write failed [" << SSLErrorString() << "]";

            return false;

        }

        data = data.substr(bytes_out);