yassl_imp.hpp

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/* yassl_imp.hpp                                
 *
 * Copyright (C) 2003 Sawtooth Consulting Ltd.
 *
 * This file is part of yaSSL.
 *
 * yaSSL is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * yaSSL is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */

/*  yaSSL implementation header defines all strucutres from the SSL.v3 
 *  specification "draft-freier-ssl-version3-02.txt"
 *  all page citations refer to this document unless otherwise noted.
 */


#ifndef yaSSL_IMP_HPP
#define yaSSL_IMP_HPP

#ifdef _MSC_VER
    // disable truncated debug symbols
    #pragma warning(disable:4786)
#endif

#include "yassl_types.hpp"
#include "factory.hpp"
#include "list.hpp"         // mySTL::list


namespace yaSSL {


class SSL;              // forward decls
class input_buffer;
class output_buffer;


struct ProtocolVersion {
    uint8 major_;
    uint8 minor_;     // major and minor SSL/TLS version numbers

    ProtocolVersion(uint8 maj = 3, uint8 min = 0);
};


// Record Layer Header for PlainText, Compressed, and CipherText
struct RecordLayerHeader {
    ContentType     type_;
    ProtocolVersion version_;
    uint16          length_;             // should not exceed 2^14
};


// base for all messages
struct Message : public virtual_base {
    virtual input_buffer& set(input_buffer&) =0;   
    virtual output_buffer& get(output_buffer&) const =0;

    virtual void Process(input_buffer&, SSL&) =0;
    virtual ContentType get_type() const =0;
    virtual uint16      get_length() const =0;

    virtual ~Message() {}
};


class ChangeCipherSpec : public Message {
    CipherChoice type_;
public:
    ChangeCipherSpec();

    friend input_buffer& operator>>(input_buffer&, ChangeCipherSpec&);
    friend output_buffer& operator<<(output_buffer&, const ChangeCipherSpec&);

    input_buffer& set(input_buffer& in);
    output_buffer& get(output_buffer& out) const;

    ContentType get_type()   const;
    uint16      get_length() const;
    void Process(input_buffer&, SSL&);
private:
    ChangeCipherSpec(const ChangeCipherSpec&);            // hide copy
    ChangeCipherSpec& operator=(const ChangeCipherSpec&); // and assign
};



class Alert : public Message {
    AlertLevel       level_;
    AlertDescription description_;
public:
    Alert() {}
    Alert(AlertLevel al, AlertDescription ad);

    ContentType get_type()   const;
    uint16      get_length() const;
    void Process(input_buffer&, SSL&);

    friend input_buffer& operator>>(input_buffer&, Alert&);
    friend output_buffer& operator<<(output_buffer&, const Alert&);
   
    input_buffer& set(input_buffer& in);
    output_buffer& get(output_buffer& out) const;
private:
    Alert(const Alert&);            // hide copy
    Alert& operator=(const Alert&); // and assign
};


class Data : public Message {
    uint16        length_;
    opaque*       buffer_;         // read  buffer used by fillData input
    const opaque* write_buffer_;   // write buffer used by output operator
public:
    Data();
    Data(uint16 len, opaque* b);
    Data(uint16 len, const opaque* w);

    friend output_buffer& operator<<(output_buffer&, const Data&);

    input_buffer& set(input_buffer& in);
    output_buffer& get(output_buffer& out) const;

    ContentType   get_type()     const;
    uint16        get_length()   const;
    const opaque* get_buffer()   const;
    void          set_length(uint16 l);
    opaque*       set_buffer();
    void Process(input_buffer&, SSL&);
private:
    Data(const Data&);            // hide copy
    Data& operator=(const Data&); // and assign
};


uint32 c24to32(const uint24);       // forward form internal header
void   c32to24(uint32, uint24&);


// HandShake header, same for each message type from page 20/21
class HandShakeHeader : public Message {
    HandShakeType      type_;
    uint24             length_;      // length of message
public:
    HandShakeHeader() {}

    ContentType   get_type()   const;
    uint16        get_length() const;
    HandShakeType get_handshakeType() const;
    void Process(input_buffer&, SSL&);

    void set_type(HandShakeType hst);
    void set_length(uint32 u32);

    friend input_buffer& operator>>(input_buffer&, HandShakeHeader&);
    friend output_buffer& operator<<(output_buffer&, const HandShakeHeader&);

    input_buffer& set(input_buffer& in);
    output_buffer& get(output_buffer& out) const;
private:
    HandShakeHeader(const HandShakeHeader&);            // hide copy
    HandShakeHeader& operator=(const HandShakeHeader&); // and assign
};


// Base Class for all handshake messages
class HandShakeBase : public virtual_base {
    int     length_;
public:
    int     get_length() const;
    void    set_length(int);

    // for building buffer's type field
    virtual HandShakeType get_type() const =0;                

    // handles dispactch of proper >>
    virtual input_buffer&  set(input_buffer& in) =0;
    virtual output_buffer& get(output_buffer& out) const =0;

    virtual void Process(input_buffer&, SSL&) =0;

    virtual ~HandShakeBase() {}
};


struct HelloRequest : public HandShakeBase {
    input_buffer&  set(input_buffer& in);
    output_buffer& get(output_buffer& out) const;

    void Process(input_buffer&, SSL&);

    HandShakeType get_type() const;
};


// The Client's Hello Message from page 23
class ClientHello : public HandShakeBase {
    ProtocolVersion     client_version_;
    Random              random_;
    uint8               id_len_;                         // session id length
    opaque              session_id_[ID_LEN];
    uint16              suite_len_;                      // cipher suite length
    opaque              cipher_suites_[MAX_SUITE_SZ];
    uint8               comp_len_;                       // compression length
    CompressionMethod   compression_methods_;  
public:
    friend input_buffer&  operator>>(input_buffer&, ClientHello&);
    friend output_buffer& operator<<(output_buffer&, const ClientHello&);
  
    input_buffer&  set(input_buffer& in);
    output_buffer& get(output_buffer& out) const;

    HandShakeType  get_type() const;
    void Process(input_buffer&, SSL&);

    const opaque* get_random() const;
    friend void buildClientHello(SSL&, ClientHello&, CompressionMethod);
    friend void ProcessOldClientHello(input_buffer& input, SSL& ssl);

    ClientHello();
    explicit ClientHello(ProtocolVersion pv);
private:
    ClientHello(const ClientHello&);            // hide copy
    ClientHello& operator=(const ClientHello&); // and assign
};



// The Server's Hello Message from page 24
class ServerHello : public HandShakeBase {
    ProtocolVersion     server_version_;
    Random              random_;
    uint8               id_len_;                 // session id length
    opaque              session_id_[ID_LEN];
    opaque              cipher_suite_[SUITE_LEN];
    CompressionMethod   compression_method_;
public:
    explicit ServerHello(ProtocolVersion pv);
    ServerHello();
          
    friend input_buffer&  operator>>(input_buffer&, ServerHello&);
    friend output_buffer& operator<<(output_buffer&, const ServerHello&);
   
    input_buffer&  set(input_buffer& in);
    output_buffer& get(output_buffer& out) const;

    HandShakeType  get_type() const;
    void Process(input_buffer&, SSL&);

    const opaque* get_random() const;
    friend void buildServerHello(SSL&, ServerHello&);
private:
    ServerHello(const ServerHello&);            // hide copy
    ServerHello& operator=(const ServerHello&); // and assign
};


class x509;  

// Certificate could be a chain
class Certificate : public HandShakeBase {
    const x509* cert_;
public:
    Certificate();
    explicit Certificate(const x509* cert); 
    friend output_buffer& operator<<(output_buffer&, const Certificate&);

    const opaque* get_buffer() const;
  
    // Process handles input, needs SSL
    input_buffer&  set(input_buffer& in);
    output_buffer& get(output_buffer& out) const;

    HandShakeType get_type() const;
    void Process(input_buffer&, SSL&);
private:
    Certificate(const Certificate&);            // hide copy
    Certificate& operator=(const Certificate&); // and assign
};



// RSA Public Key
struct ServerRSAParams {
    opaque* rsa_modulus_;
    opaque* rsa_exponent_;
};


// Ephemeral Diffie-Hellman Parameters
class ServerDHParams {
    int pSz_;
    int gSz_;
    int pubSz_;
    opaque* p_;
    opaque* g_;
    opaque* Ys_;
public:
    ServerDHParams();
    ~ServerDHParams();

    int get_pSize()   const;
    int get_gSize()   const;
    int get_pubSize() const;

    const opaque* get_p()   const;
    const opaque* get_g()   const;
    const opaque* get_pub() const;

    opaque* alloc_p(int sz);
    opaque* alloc_g(int sz);
    opaque* alloc_pub(int sz);
private:
    ServerDHParams(const ServerDHParams&);            // hide copy
    ServerDHParams& operator=(const ServerDHParams&); // and assign
};


struct ServerKeyBase : public virtual_base {
    virtual ~ServerKeyBase() {}
    virtual void build(SSL&) {}
    virtual void read(SSL&, input_buffer&) {}
    virtual int  get_length() const;     
    virtual opaque* get_serverKey() const;
};


// Server random number for FORTEZZA KEA
struct Fortezza_Server : public ServerKeyBase {
    opaque r_s_[FORTEZZA_MAX];
};


struct SignatureBase : public virtual_base {
    virtual ~SignatureBase() {}
};

struct anonymous_sa : public SignatureBase {};


struct Hashes {
    uint8 md5_[MD5_LEN];
    uint8 sha_[SHA_LEN];
};
    

struct rsa_sa : public SignatureBase {
    Hashes hashes_;
};


struct dsa_sa : public SignatureBase {
    uint8 sha_[SHA_LEN];
};


// Server's Diffie-Hellman exchange
class DH_Server : public ServerKeyBase {
    ServerDHParams  parms_;
    opaque*         signature_;