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POc# vs c++ ssl_connect
 

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  1. POc# vs c++ ssl_connect
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    <p>Hello i have a c++ application that uses openssl and winapi sockets, and the code looks like this:</p> <pre><code>sock = socket(AF_INET, SOCK_STREAM, 0); if (connect(my_sock, (struct sockaddr*)&amp;dest_addr, sizeof(dest_addr))==0) { WSAIoctl(my_sock, SIO_KEEPALIVE_VALS, &amp;alive, sizeof(alive),NULL, 0, &amp;dwSize, NULL, NULL); } } ..... SSL_load_error_strings(); SSL_library_init(); ctx = SSL_CTX_new(SSLv23_client_method()); if(!ctx) { return false; } ssl = SSL_new(ctx); SSL_CTX_free(ctx); if(!ssl) { return false; } SSL_set_fd(ssl, (int)sock); //making the socket use ssl mode result = SSL_connect(ssl); </code></pre> <p>Im using the static ssl libraries with this c++ application, which i downloaded from <a href="http://slproweb.com/download/Win32OpenSSL-1_0_1e.exe" rel="nofollow">here</a></p> <p>Everything works fine, and ssl_connect returns 1. But what i need to do is re-write this code using c#. So i tried, and c# code looks like this:</p> <pre><code> [DllImport("ssleay32.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "SSL_read")] public static extern int SSL_Read(IntPtr ssl, ref byte[] buf, int num); [DllImport("ssleay32.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "SSL_write")] public static extern int SSL_Write(IntPtr ssl, byte[] buf, int num); [DllImport("ssleay32.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "SSL_set_fd")] extern public static int SSL_set_fd(IntPtr ssl, int fd); [DllImport("ssleay32.dll", CallingConvention= CallingConvention.Cdecl, EntryPoint = "SSL_CTX_new")] extern public static IntPtr SSL_CTX_new(IntPtr method); [DllImport("ssleay32.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "SSL_new")] extern public static IntPtr SSL_new(IntPtr ctx); [DllImport("ssleay32.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "SSL_connect")] extern public static int SSL_connect(IntPtr ssl); [DllImport("ssleay32.dll",CallingConvention= CallingConvention.Cdecl, EntryPoint = "SSL_load_error_strings")] extern public static void SSL_load_error_strings(); [DllImport("ssleay32.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "SSL_library_init")] extern public static int SSL_library_init(); [DllImport("ssleay32.dll",CallingConvention= CallingConvention.Cdecl, EntryPoint = "SSLeay_add_all_algorithms")] extern public static int SSLeay_add_all_algorithms(); [DllImport("ssleay32.dll",CallingConvention= CallingConvention.Cdecl, EntryPoint = "SSLv23_client_method")] extern public static IntPtr SSLv23_client_method(); [DllImport("ssleay32.dll",CallingConvention= CallingConvention.Cdecl, EntryPoint = "SSLv3_client_method")] extern public static IntPtr SSLv3_client_method(); [DllImport("ssleay32.dll",CallingConvention= CallingConvention.Cdecl, EntryPoint = "SSL_CTX_free")] extern public static void SSL_CTX_free(IntPtr ctx); [DllImport("ssleay32.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "SSL_free")] extern public static void SSL_free(IntPtr ssl); [DllImport("ssleay32.dll",CallingConvention= CallingConvention.Cdecl, EntryPoint = "SSL_get_error")] extern public static int SSL_get_error(IntPtr ssl, int ret); [DllImport("ssleay32.dll",CallingConvention= CallingConvention.Cdecl, EntryPoint = " SSL_CTX_set_mode")] extern public static long SSL_CTX_set_mode(IntPtr ctx, long mode); [DllImport("libeay32", CallingConvention = CallingConvention.Cdecl, EntryPoint = "OPENSSL_add_all_algorithms_noconf")] extern public static void OpenSSL_add_all_algorithms(); [DllImport("libeay32", CallingConvention = CallingConvention.Cdecl, EntryPoint = "ERR_get_error")] extern public static int ERR_get_error(); [DllImport("ssleay32.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "SSL_CTX_ctrl")] public extern static int SSL_CTX_ctrl(IntPtr ctx, int cmd, int arg, IntPtr parg); [DllImport("ssleay32.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "SSLv23_method")] public extern static IntPtr SSLv23_method(); public bool Ssl_Init() { SSL_load_error_strings(); OpenSSL_add_all_algorithms(); SSL_library_init(); IntPtr method = SSLv23_client_method(); IntPtr ctx = SSL_CTX_new(method); if (ctx == IntPtr.Zero) { return false; } _ssl = SSL_new(ctx); if (_ssl == IntPtr.Zero) { return false; } int val = SSL_set_fd(_ssl, this.socket.Handle.ToInt32()); //always returns 1 int result = SSL_connect(_ssl); if(result!=1) return false; SSL_CTX_free(ctx); Ssl_Enabled.Set(); return true; } </code></pre> <p>My c# socket is created like so:</p> <pre><code> socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); this.socket.Connect(host,port); socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.KeepAlive, 1000); </code></pre> <p>I always get SSL_Connect = 0 in my c# code, with SSL_get_error() = 5 (error_syscall). So basically my question is, what's might be wrong with using .net socket with openssl? (because c++ application works perfectly with the same kind of code).</p> <p>Update: I tried to use OPENSSL_add_all_algorithms_conf but it seems it doesn't change anything... I'm begging you for help!!</p>
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