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POHow to add authentication to a socks5 proxy server?
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6054092
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AcceptedAnswerId
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CreationDate
2011-05-19T05:15:00.873
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2011-05-19T06:00:03.757
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text
Body
I am trying to build a socks5 proxy server using codes I found googling and customizing them. Everything works fine so far but now I want to add authentication to the socks5. This is the code that handle the requests: <pre><code>SOCKET socks5Handler( SOCKET Client, char* Buffer ) { SOCKS5AUTH sAuth; char *Host = NULL; SOCKET Target = INVALID_SOCKET; ulong Ip = 0; ushort Port = 0; byte Command = 0, Type = 0; int i = 0; if( sockRecv(Client, Buffer, 1) < 0 ) return INVALID_SOCKET; if( sockRecv(Client, Buffer, Buffer[0]) < 0 ) return INVALID_SOCKET; Buffer[0] = 0x05; Buffer[1] = 0x00; send( Client, Buffer, 2, 0 ); if( sockRecv(Client, Buffer, 4) < 0 ) return INVALID_SOCKET; Command = Buffer[1]; Type = Buffer[3]; if( Type == 0x01 ) { if( sockRecv(Client, Buffer, 4) < 0 ) return INVALID_SOCKET; Ip = *((ulong*)Buffer); } else if( Type == 0x03 ) { if( sockRecv(Client, Buffer, 1) < 0 ) return INVALID_SOCKET; i = Buffer[0]; if( sockRecv(Client, Buffer, i) < 0 ) return INVALID_SOCKET; Buffer[i] = 0; Host = Buffer; } else return INVALID_SOCKET; if( sockRecv(Client, (char*)&Port, 2) < 0) return INVALID_SOCKET; if( Command == 0x01 ) { if( Host ) Ip = sock_resolve( Host ); Target = sock_connect( sock_create(), Ip, htons(Port) ); if( Target == INVALID_SOCKET ) return INVALID_SOCKET; } else return INVALID_SOCKET; Buffer[0] = 0x05; Buffer[1] = 0x00; Buffer[2] = 0x00; Buffer[3] = 0x01; *((ulong* )(Buffer + 4)) = Ip; *((ushort*)(Buffer + 8)) = Port; send( Client, Buffer, 10, 0 ); return Target; } BOOL sockRecv( SOCKET Sock, char* Buffer, int Length ) { int r = 0; while( Length ) { r = recv( Sock, Buffer, Length, 0 ); if( r <= 0 ) return FALSE; Buffer += r; Length -= r; } return TRUE; } </code></pre> I figured out that if I add: <pre><code>if(Buffer[0] != 0x02) return INVALID_SOCKET; </code></pre> after the first sockRecv, I can know if auth is being sent or not (0x1 is not auth and 0x2 is auth). Now, how could I read the username and password sent? I tried sniffing the network but that didn't show me anything good.
Tags
<c++><sockets><authentication><proxy><winsock>
Title
How to add authentication to a socks5 proxy server?
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1. PO
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1. PTQuestion
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1. USriviraz
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