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Diffstat (limited to 'src/ssl/hello.cpp')
| -rw-r--r-- | src/ssl/hello.cpp | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/src/ssl/hello.cpp b/src/ssl/hello.cpp new file mode 100644 index 000000000..ba30ec5f7 --- /dev/null +++ b/src/ssl/hello.cpp @@ -0,0 +1,267 @@ +/** +* TLS Hello Messages +* (C) 2004-2006 Jack Lloyd +* +* Released under the terms of the Botan license +*/ + +#include <botan/tls_messages.h> +#include <botan/tls_exceptn.h> +#include <botan/loadstor.h> +#include <botan/exceptn.h> + +namespace Botan { + +/** +* Encode and send a Handshake message +*/ +void HandshakeMessage::send(Record_Writer& writer, HandshakeHash& hash) const + { + SecureVector<byte> buf = serialize(); + SecureVector<byte> send_buf(4); + + u32bit buf_size = buf.size(); + + send_buf[0] = type(); + send_buf[1] = get_byte(1, buf_size); + send_buf[2] = get_byte(2, buf_size); + send_buf[3] = get_byte(3, buf_size); + + send_buf.append(buf); + + hash.update(send_buf); + + writer.send(HANDSHAKE, send_buf, send_buf.size()); + writer.flush(); + } + +/** +* Create a new Hello Request message +*/ +Hello_Request::Hello_Request(Record_Writer& writer) + { + HandshakeHash dummy; // FIXME: *UGLY* + send(writer, dummy); + } + +/** +* Serialize a Hello Request message +*/ +SecureVector<byte> Hello_Request::serialize() const + { + return SecureVector<byte>(); + } + +/** +* Deserialize a Hello Request message +*/ +void Hello_Request::deserialize(const MemoryRegion<byte>& buf) + { + if(buf.size()) + throw Decoding_Error("Hello_Request: Must be empty, and is not"); + } + +/** +* Create a new Client Hello message +*/ +Client_Hello::Client_Hello(RandomNumberGenerator& rng, + Record_Writer& writer, const Policy* policy, + HandshakeHash& hash) + { + c_random.resize(32); + rng.randomize(c_random, c_random.size()); + + suites = policy->ciphersuites(); + comp_algos = policy->compression(); + c_version = policy->pref_version(); + + send(writer, hash); + } + +/** +* Serialize a Client Hello message +*/ +SecureVector<byte> Client_Hello::serialize() const + { + SecureVector<byte> buf; + + buf.append(static_cast<byte>(c_version >> 8)); + buf.append(static_cast<byte>(c_version )); + buf.append(c_random); + buf.append(static_cast<byte>(sess_id.size())); + buf.append(sess_id); + + u16bit suites_size = 2*suites.size(); + + buf.append(get_byte(0, suites_size)); + buf.append(get_byte(1, suites_size)); + for(u32bit j = 0; j != suites.size(); j++) + { + buf.append(get_byte(0, suites[j])); + buf.append(get_byte(1, suites[j])); + } + + buf.append(static_cast<byte>(comp_algos.size())); + for(u32bit j = 0; j != comp_algos.size(); j++) + buf.append(comp_algos[j]); + + return buf; + } + +/** +* Deserialize a Client Hello message +*/ +void Client_Hello::deserialize(const MemoryRegion<byte>& buf) + { + if(buf.size() == 0) + throw Decoding_Error("Client_Hello: Packet corrupted"); + + if(buf.size() < 41) + throw Decoding_Error("Client_Hello: Packet corrupted"); + + c_version = static_cast<Version_Code>(make_u16bit(buf[0], buf[1])); + if(c_version != SSL_V3 && c_version != TLS_V10) + throw TLS_Exception(PROTOCOL_VERSION, "Client_Hello: Bad version code"); + + c_random.set(buf + 2, 32); + + u32bit session_id_len = buf[34]; + if(session_id_len > 32 || session_id_len + 41 > buf.size()) + throw Decoding_Error("Client_Hello: Packet corrupted"); + sess_id.copy(buf + 35, session_id_len); + + u32bit offset = 2+32+1+session_id_len; + + u16bit suites_size = make_u16bit(buf[offset], buf[offset+1]); + offset += 2; + if(suites_size % 2 == 1 || offset + suites_size + 2 > buf.size()) + throw Decoding_Error("Client_Hello: Packet corrupted"); + + for(u32bit j = 0; j != suites_size; j += 2) + { + u16bit suite = make_u16bit(buf[offset+j], buf[offset+j+1]); + suites.push_back(suite); + } + offset += suites_size; + + byte comp_algo_size = buf[offset]; + offset += 1; + if(offset + comp_algo_size > buf.size()) + throw Decoding_Error("Client_Hello: Packet corrupted"); + + for(u32bit j = 0; j != comp_algo_size; j++) + comp_algos.push_back(buf[offset+j]); + } + +/** +* Check if we offered this ciphersuite +*/ +bool Client_Hello::offered_suite(u16bit ciphersuite) const + { + for(u32bit j = 0; j != suites.size(); j++) + if(suites[j] == ciphersuite) + return true; + return false; + } + +/** +* Create a new Server Hello message +*/ +Server_Hello::Server_Hello(RandomNumberGenerator& rng, + Record_Writer& writer, const Policy* policy, + const std::vector<X509_Certificate>& certs, + const Client_Hello& c_hello, Version_Code ver, + HandshakeHash& hash) + { + bool have_rsa = false, have_dsa = false; + for(u32bit j = 0; j != certs.size(); j++) + { + X509_PublicKey* key = certs[j].subject_public_key(); + if(key->algo_name() == "RSA") have_rsa = true; + if(key->algo_name() == "DSA") have_dsa = true; + } + + suite = policy->choose_suite(c_hello.ciphersuites(), have_rsa, have_dsa); + comp_algo = policy->choose_compression(c_hello.compression_algos()); + + s_version = ver; + s_random.resize(32); + rng.randomize(s_random, s_random.size()); + + send(writer, hash); + } + +/** +* Serialize a Server Hello message +*/ +SecureVector<byte> Server_Hello::serialize() const + { + SecureVector<byte> buf; + + buf.append(static_cast<byte>(s_version >> 8)); + buf.append(static_cast<byte>(s_version )); + buf.append(s_random); + buf.append(static_cast<byte>(sess_id.size())); + buf.append(sess_id); + + buf.append(get_byte(0, suite)); + buf.append(get_byte(1, suite)); + + buf.append(comp_algo); + + return buf; + } + +/** +* Deserialize a Server Hello message +*/ +void Server_Hello::deserialize(const MemoryRegion<byte>& buf) + { + if(buf.size() < 38) + throw Decoding_Error("Server_Hello: Packet corrupted"); + + s_version = static_cast<Version_Code>(make_u16bit(buf[0], buf[1])); + if(s_version != SSL_V3 && s_version != TLS_V10) + throw TLS_Exception(PROTOCOL_VERSION, + "Server_Hello: Unsupported server version"); + + s_random.set(buf + 2, 32); + + u32bit session_id_len = buf[2+32]; + if(session_id_len > 32 || session_id_len + 38 != buf.size()) + throw Decoding_Error("Server_Hello: Packet corrupted"); + sess_id.copy(buf + 2 + 32 + 1, session_id_len); + + suite = make_u16bit(buf[2+32+1+session_id_len], + buf[2+32+1+session_id_len+1]); + comp_algo = buf[2+32+1+session_id_len+2]; + } + + +/** +* Create a new Server Hello Done message +*/ +Server_Hello_Done::Server_Hello_Done(Record_Writer& writer, + HandshakeHash& hash) + { + send(writer, hash); + } + +/** +* Serialize a Server Hello Done message +*/ +SecureVector<byte> Server_Hello_Done::serialize() const + { + return SecureVector<byte>(); + } + +/** +* Deserialize a Server Hello Done message +*/ +void Server_Hello_Done::deserialize(const MemoryRegion<byte>& buf) + { + if(buf.size()) + throw Decoding_Error("Server_Hello_Done: Must be empty, and is not"); + } + +} |