flm01/openwrt/package/luci/libs/nixio/axTLS/bindings/csharp/axTLS.cs

492 lines
17 KiB
C#

/*
* Copyright (c) 2007, Cameron Rich
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of the axTLS project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* A wrapper around the unmanaged interface to give a semi-decent C# API
*/
using System;
using System.Runtime.InteropServices;
using System.Net.Sockets;
/**
* @defgroup csharp_api C# API.
*
* Ensure that the appropriate Dispose() methods are called when finished with
* various objects - otherwise memory leaks will result.
* @{
*/
namespace axTLS
{
/**
* @class SSL
* @ingroup csharp_api
* @brief A representation of an SSL connection.
*/
public class SSL
{
public IntPtr m_ssl; /**< A pointer to the real SSL type */
/**
* @brief Store the reference to an SSL context.
* @param ip [in] A reference to an SSL object.
*/
public SSL(IntPtr ip)
{
m_ssl = ip;
}
/**
* @brief Free any used resources on this connection.
*
* A "Close Notify" message is sent on this connection (if possible).
* It is up to the application to close the socket.
*/
public void Dispose()
{
axtls.ssl_free(m_ssl);
}
/**
* @brief Return the result of a handshake.
* @return SSL_OK if the handshake is complete and ok.
* @see ssl.h for the error code list.
*/
public int HandshakeStatus()
{
return axtls.ssl_handshake_status(m_ssl);
}
/**
* @brief Return the SSL cipher id.
* @return The cipher id which is one of:
* - SSL_AES128_SHA (0x2f)
* - SSL_AES256_SHA (0x35)
* - SSL_RC4_128_SHA (0x05)
* - SSL_RC4_128_MD5 (0x04)
*/
public byte GetCipherId()
{
return axtls.ssl_get_cipher_id(m_ssl);
}
/**
* @brief Get the session id for a handshake.
*
* This will be a 32 byte sequence and is available after the first
* handshaking messages are sent.
* @return The session id as a 32 byte sequence.
* @note A SSLv23 handshake may have only 16 valid bytes.
*/
public byte[] GetSessionId()
{
IntPtr ptr = axtls.ssl_get_session_id(m_ssl);
byte sess_id_size = axtls.ssl_get_session_id_size(m_ssl);
byte[] result = new byte[sess_id_size];
Marshal.Copy(ptr, result, 0, sess_id_size);
return result;
}
/**
* @brief Retrieve an X.509 distinguished name component.
*
* When a handshake is complete and a certificate has been exchanged,
* then the details of the remote certificate can be retrieved.
*
* This will usually be used by a client to check that the server's
* common name matches the URL.
*
* A full handshake needs to occur for this call to work.
*
* @param component [in] one of:
* - SSL_X509_CERT_COMMON_NAME
* - SSL_X509_CERT_ORGANIZATION
* - SSL_X509_CERT_ORGANIZATIONAL_NAME
* - SSL_X509_CA_CERT_COMMON_NAME
* - SSL_X509_CA_CERT_ORGANIZATION
* - SSL_X509_CA_CERT_ORGANIZATIONAL_NAME
* @return The appropriate string (or null if not defined)
*/
public string GetCertificateDN(int component)
{
return axtls.ssl_get_cert_dn(m_ssl, component);
}
}
/**
* @class SSLUtil
* @ingroup csharp_api
* @brief Some global helper functions.
*/
public class SSLUtil
{
/**
* @brief Return the build mode of the axTLS project.
* @return The build mode is one of:
* - SSL_BUILD_SERVER_ONLY
* - SSL_BUILD_ENABLE_VERIFICATION
* - SSL_BUILD_ENABLE_CLIENT
* - SSL_BUILD_FULL_MODE
*/
public static int BuildMode()
{
return axtls.ssl_get_config(axtls.SSL_BUILD_MODE);
}
/**
* @brief Return the number of chained certificates that the
* client/server supports.
* @return The number of supported server certificates.
*/
public static int MaxCerts()
{
return axtls.ssl_get_config(axtls.SSL_MAX_CERT_CFG_OFFSET);
}
/**
* @brief Return the number of CA certificates that the client/server
* supports.
* @return The number of supported CA certificates.
*/
public static int MaxCACerts()
{
return axtls.ssl_get_config(axtls.SSL_MAX_CA_CERT_CFG_OFFSET);
}
/**
* @brief Indicate if PEM is supported.
* @return true if PEM supported.
*/
public static bool HasPEM()
{
return axtls.ssl_get_config(axtls.SSL_HAS_PEM) > 0 ? true : false;
}
/**
* @brief Display the text string of the error.
* @param error_code [in] The integer error code.
*/
public static void DisplayError(int error_code)
{
axtls.ssl_display_error(error_code);
}
/**
* @brief Return the version of the axTLS project.
*/
public static string Version()
{
return axtls.ssl_version();
}
}
/**
* @class SSLCTX
* @ingroup csharp_api
* @brief A base object for SSLServer/SSLClient.
*/
public class SSLCTX
{
/**
* @brief A reference to the real client/server context.
*/
protected IntPtr m_ctx;
/**
* @brief Establish a new client/server context.
*
* This function is called before any client/server SSL connections are
* made. If multiple threads are used, then each thread will have its
* own SSLCTX context. Any number of connections may be made with a
* single context.
*
* Each new connection will use the this context's private key and
* certificate chain. If a different certificate chain is required,
* then a different context needs to be be used.
*
* @param options [in] Any particular options. At present the options
* supported are:
* - SSL_SERVER_VERIFY_LATER (client only): Don't stop a handshake if
* the server authentication fails. The certificate can be
* authenticated later with a call to VerifyCert().
* - SSL_CLIENT_AUTHENTICATION (server only): Enforce client
* authentication i.e. each handshake will include a "certificate
* request" message from the server.
* - SSL_DISPLAY_BYTES (full mode build only): Display the byte
* sequences during the handshake.
* - SSL_DISPLAY_STATES (full mode build only): Display the state
* changes during the handshake.
* - SSL_DISPLAY_CERTS (full mode build only): Display the
* certificates that are passed during a handshake.
* - SSL_DISPLAY_RSA (full mode build only): Display the RSA key
* details that are passed during a handshake.
* @param num_sessions [in] The number of sessions to be used for
* session caching. If this value is 0, then there is no session
* caching.
* @return A client/server context.
*/
protected SSLCTX(uint options, int num_sessions)
{
m_ctx = axtls.ssl_ctx_new(options, num_sessions);
}
/**
* @brief Remove a client/server context.
*
* Frees any used resources used by this context. Each connection will
* be sent a "Close Notify" alert (if possible).
*/
public void Dispose()
{
axtls.ssl_ctx_free(m_ctx);
}
/**
* @brief Read the SSL data stream.
* @param ssl [in] An SSL object reference.
* @param in_data [out] After a successful read, the decrypted data
* will be here. It will be null otherwise.
* @return The number of decrypted bytes:
* - if > 0, then the handshaking is complete and we are returning the
* number of decrypted bytes.
* - SSL_OK if the handshaking stage is successful (but not yet
* complete).
* - < 0 if an error.
* @see ssl.h for the error code list.
* @note Use in_data before doing any successive ssl calls.
*/
public int Read(SSL ssl, out byte[] in_data)
{
IntPtr ptr = IntPtr.Zero;
int ret = axtls.ssl_read(ssl.m_ssl, ref ptr);
if (ret > axtls.SSL_OK)
{
in_data = new byte[ret];
Marshal.Copy(ptr, in_data, 0, ret);
}
else
{
in_data = null;
}
return ret;
}
/**
* @brief Write to the SSL data stream.
* @param ssl [in] An SSL obect reference.
* @param out_data [in] The data to be written
* @return The number of bytes sent, or if < 0 if an error.
* @see ssl.h for the error code list.
*/
public int Write(SSL ssl, byte[] out_data)
{
return axtls.ssl_write(ssl.m_ssl, out_data, out_data.Length);
}
/**
* @brief Write to the SSL data stream.
* @param ssl [in] An SSL obect reference.
* @param out_data [in] The data to be written
* @param out_len [in] The number of bytes to be written
* @return The number of bytes sent, or if < 0 if an error.
* @see ssl.h for the error code list.
*/
public int Write(SSL ssl, byte[] out_data, int out_len)
{
return axtls.ssl_write(ssl.m_ssl, out_data, out_len);
}
/**
* @brief Find an ssl object based on a Socket reference.
*
* Goes through the list of SSL objects maintained in a client/server
* context to look for a socket match.
* @param s [in] A reference to a <A HREF="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemnetsocketssocketclasstopic.asp">Socket</A> object.
* @return A reference to the SSL object. Returns null if the object
* could not be found.
*/
public SSL Find(Socket s)
{
int client_fd = s.Handle.ToInt32();
return new SSL(axtls. ssl_find(m_ctx, client_fd));
}
/**
* @brief Authenticate a received certificate.
*
* This call is usually made by a client after a handshake is complete
* and the context is in SSL_SERVER_VERIFY_LATER mode.
* @param ssl [in] An SSL object reference.
* @return SSL_OK if the certificate is verified.
*/
public int VerifyCert(SSL ssl)
{
return axtls.ssl_verify_cert(ssl.m_ssl);
}
/**
* @brief Force the client to perform its handshake again.
*
* For a client this involves sending another "client hello" message.
* For the server is means sending a "hello request" message.
*
* This is a blocking call on the client (until the handshake
* completes).
* @param ssl [in] An SSL object reference.
* @return SSL_OK if renegotiation instantiation was ok
*/
public int Renegotiate(SSL ssl)
{
return axtls.ssl_renegotiate(ssl.m_ssl);
}
/**
* @brief Load a file into memory that is in binary DER or ASCII PEM
* format.
*
* These are temporary objects that are used to load private keys,
* certificates etc into memory.
* @param obj_type [in] The format of the file. Can be one of:
* - SSL_OBJ_X509_CERT (no password required)
* - SSL_OBJ_X509_CACERT (no password required)
* - SSL_OBJ_RSA_KEY (AES128/AES256 PEM encryption supported)
* - SSL_OBJ_P8 (RC4-128 encrypted data supported)
* - SSL_OBJ_P12 (RC4-128 encrypted data supported)
*
* PEM files are automatically detected (if supported).
* @param filename [in] The location of a file in DER/PEM format.
* @param password [in] The password used. Can be null if not required.
* @return SSL_OK if all ok
*/
public int ObjLoad(int obj_type, string filename, string password)
{
return axtls.ssl_obj_load(m_ctx, obj_type, filename, password);
}
/**
* @brief Transfer binary data into the object loader.
*
* These are temporary objects that are used to load private keys,
* certificates etc into memory.
* @param obj_type [in] The format of the memory data.
* @param data [in] The binary data to be loaded.
* @param len [in] The amount of data to be loaded.
* @param password [in] The password used. Can be null if not required.
* @return SSL_OK if all ok
*/
public int ObjLoad(int obj_type, byte[] data, int len, string password)
{
return axtls.ssl_obj_memory_load(m_ctx, obj_type,
data, len, password);
}
}
/**
* @class SSLServer
* @ingroup csharp_api
* @brief The server context.
*
* All server connections are started within a server context.
*/
public class SSLServer : SSLCTX
{
/**
* @brief Start a new server context.
*
* @see SSLCTX for details.
*/
public SSLServer(uint options, int num_sessions) :
base(options, num_sessions) {}
/**
* @brief Establish a new SSL connection to an SSL client.
*
* It is up to the application to establish the initial socket
* connection.
*
* Call Dispose() when the connection is to be removed.
* @param s [in] A reference to a <A HREF="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemnetsocketssocketclasstopic.asp">Socket</A> object.
* @return An SSL object reference.
*/
public SSL Connect(Socket s)
{
int client_fd = s.Handle.ToInt32();
return new SSL(axtls.ssl_server_new(m_ctx, client_fd));
}
}
/**
* @class SSLClient
* @ingroup csharp_api
* @brief The client context.
*
* All client connections are started within a client context.
*/
public class SSLClient : SSLCTX
{
/**
* @brief Start a new client context.
*
* @see SSLCTX for details.
*/
public SSLClient(uint options, int num_sessions) :
base(options, num_sessions) {}
/**
* @brief Establish a new SSL connection to an SSL server.
*
* It is up to the application to establish the initial socket
* connection.
*
* This is a blocking call - it will finish when the handshake is
* complete (or has failed).
*
* Call Dispose() when the connection is to be removed.
* @param s [in] A reference to a <A HREF="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemnetsocketssocketclasstopic.asp">Socket</A> object.
* @param session_id [in] A 32 byte session id for session resumption.
* This can be null if no session resumption is not required.
* @return An SSL object reference. Use SSL.handshakeStatus() to check
* if a handshake succeeded.
*/
public SSL Connect(Socket s, byte[] session_id)
{
int client_fd = s.Handle.ToInt32();
byte sess_id_size = (byte)(session_id != null ?
session_id.Length : 0);
return new SSL(axtls.ssl_client_new(m_ctx, client_fd, session_id,
sess_id_size));
}
}
}
/** @} */