9#include <botan/tls_messages.h>
12#include <botan/tls_extensions.h>
14#include <botan/credentials_manager.h>
15#include <botan/internal/ct_utils.h>
16#include <botan/internal/stl_util.h>
17#include <botan/internal/tls_handshake_hash.h>
18#include <botan/internal/tls_handshake_io.h>
19#include <botan/internal/tls_handshake_state.h>
20#include <botan/internal/tls_reader.h>
22#include <botan/ecdh.h>
35 std::string_view hostname,
40 std::string identity_hint;
44 identity_hint = reader.
get_string(2, 0, 65535);
47 m_psk_identity = creds.
psk_identity(
"tls-client", std::string(hostname), identity_hint);
51 SymmetricKey psk = creds.
psk(
"tls-client", std::string(hostname), m_psk_identity.value());
53 std::vector<uint8_t> zeros(psk.
length());
63 std::string identity_hint = reader.
get_string(2, 0, 65535);
65 m_psk_identity = creds.
psk_identity(
"tls-client", std::string(hostname), identity_hint);
69 psk = creds.
psk(
"tls-client", std::string(hostname), m_psk_identity.value());
75 const std::vector<uint8_t> peer_public_value = reader.
get_range<uint8_t>(2, 1, 65535);
84 throw TLS_Exception(Alert::InsufficientSecurity,
"DH group validation failed");
92 m_pre_master = std::move(shared_secret);
100 const uint8_t curve_type = reader.
get_byte();
101 if(curve_type != 3) {
106 const std::vector<uint8_t> peer_public_value = reader.
get_range<uint8_t>(1, 1, 255);
110 "Server selected a group that is not compatible with the negotiated ciphersuite");
114 throw TLS_Exception(Alert::HandshakeFailure,
"Server sent ECC curve prohibited by policy");
125 if((curve_id == Group_Params::X25519 || curve_id == Group_Params::X448) &&
126 CT::all_zeros(shared_secret.data(), shared_secret.size()).as_bool()) {
127 throw TLS_Exception(Alert::DecryptError,
"Bad X25519 or X448 key exchange");
131 m_pre_master = std::move(shared_secret);
140 throw TLS_Exception(Alert::InternalError,
"Application did not provide a ECDH_PublicKey");
143 ecdh_key->public_value(state.
server_hello()->prefers_compressed_ec_points()
151 throw Internal_Error(
"Client_Key_Exchange: Unknown key exchange method was negotiated");
159 throw Unexpected_Message(
"No server kex message, but negotiated a key exchange that required it");
162 if(!server_public_key) {
166 if(
auto rsa_pub =
dynamic_cast<const RSA_PublicKey*
>(server_public_key)) {
175 const std::vector<uint8_t> encrypted_key = encryptor.
encrypt(m_pre_master, rng);
180 "Expected a RSA key in server cert but got " + server_public_key->
algo_name());
200 "RSA key exchange negotiated so server sent a certificate");
202 if(!server_rsa_kex_key) {
203 throw Internal_Error(
"Expected RSA kex but no server kex key set");
206 if(server_rsa_kex_key->
algo_name() !=
"RSA") {
211 const std::vector<uint8_t> encrypted_pre_master = reader.
get_range<uint8_t>(2, 0, 65535);
216 const uint8_t client_major = state.
client_hello()->legacy_version().major_version();
217 const uint8_t client_minor = state.
client_hello()->legacy_version().minor_version();
225 const size_t expected_plaintext_size = 48;
226 const size_t expected_content_size = 2;
227 const uint8_t expected_content_bytes[expected_content_size] = {client_major, client_minor};
228 const uint8_t expected_content_pos[expected_content_size] = {0, 1};
231 encrypted_pre_master.size(),
232 expected_plaintext_size,
234 expected_content_bytes,
235 expected_content_pos,
236 expected_content_size);
243 m_psk_identity = reader.
get_string(2, 0, 65535);
245 psk = creds.
psk(
"tls-server", state.
client_hello()->sni_hostname(), m_psk_identity.value());
251 throw TLS_Exception(Alert::UnknownPSKIdentity,
"No PSK for identifier " + m_psk_identity.value());
257 std::vector<uint8_t> zeros(psk.
length());
263 const std::vector<uint8_t> client_pubkey = (ka_key.
algo_name() ==
"DH")
267 const auto shared_group = state.
server_kex()->shared_group();
285 if((group == Group_Params::X25519 || group == Group_Params::X448) &&
286 CT::all_zeros(shared_secret.data(), shared_secret.size()).as_bool()) {
287 throw TLS_Exception(Alert::DecryptError,
"Bad X25519 or X448 key exchange");
295 m_pre_master = shared_secret;
302 }
catch(std::exception&) {
314 throw Internal_Error(
"Client_Key_Exchange: Unknown key exchange negotiated");
#define BOTAN_ASSERT_NOMSG(expr)
#define BOTAN_STATE_CHECK(expr)
#define BOTAN_ASSERT(expr, assertion_made)
virtual std::string algo_name() const =0
static BigInt from_bytes(std::span< const uint8_t > bytes)
virtual std::string psk_identity(const std::string &type, const std::string &context, const std::string &identity_hint)
virtual SymmetricKey psk(const std::string &type, const std::string &context, const std::string &identity)
bool verify_group(RandomNumberGenerator &rng, bool strong=true) const
const char * what() const noexcept override
secure_vector< uint8_t > bits_of() const
secure_vector< uint8_t > decrypt_or_random(const uint8_t in[], size_t length, size_t expected_pt_len, RandomNumberGenerator &rng) const
std::vector< uint8_t > encrypt(const uint8_t in[], size_t length, RandomNumberGenerator &rng) const
virtual std::vector< uint8_t > public_value() const =0
void random_vec(std::span< uint8_t > v)
virtual secure_vector< uint8_t > tls_ephemeral_key_agreement(const std::variant< TLS::Group_Params, DL_Group > &group, const PK_Key_Agreement_Key &private_key, const std::vector< uint8_t > &public_value, RandomNumberGenerator &rng, const Policy &policy)
virtual std::unique_ptr< PK_Key_Agreement_Key > tls_generate_ephemeral_key(const std::variant< TLS::Group_Params, DL_Group > &group, RandomNumberGenerator &rng)
Kex_Algo kex_method() const
Client_Key_Exchange(Handshake_IO &io, Handshake_State &state, const Policy &policy, Credentials_Manager &creds, const Public_Key *server_public_key, std::string_view hostname, RandomNumberGenerator &rng)
constexpr bool is_ecdh_named_curve() const
constexpr bool is_x448() const
constexpr bool is_x25519() const
void update(const uint8_t in[], size_t length)
virtual std::vector< uint8_t > send(const Handshake_Message &msg)=0
void server_certs(Certificate_12 *server_certs)
void server_hello(Server_Hello_12 *server_hello)
void server_kex(Server_Key_Exchange *server_kex)
Callbacks & callbacks() const
const Ciphersuite & ciphersuite() const
void client_hello(Client_Hello_12 *client_hello)
virtual bool hide_unknown_users() const
virtual Group_Params choose_key_exchange_group(const std::vector< Group_Params > &supported_by_peer, const std::vector< Group_Params > &offered_by_peer) const
uint8_t major_version() const
uint8_t minor_version() const
std::string get_string(size_t len_bytes, size_t min_bytes, size_t max_bytes)
std::vector< T > get_range(size_t len_bytes, size_t min_elems, size_t max_elems)
size_t remaining_bytes() const
secure_vector< uint8_t > strip_leading_zeros(const uint8_t in[], size_t length)
constexpr CT::Mask< T > all_zeros(const T elem[], size_t len)
void append_tls_length_value(std::vector< uint8_t, Alloc > &buf, const T *vals, size_t vals_size, size_t tag_size)
bool key_exchange_is_psk(Kex_Algo m)
T to_byte_vector(std::string_view s)