Just thought I would include

mark.p.jones — Wed, 07 Nov 2012 12:51:33 +0000

Just thought I would include an example of the two sets of comments combined.

The config is in C:\Program Files (x86)\ejabberd-2.1.1\conf
The file is ejabberd.cfg

%%
%% auth_method: Method used to authenticate the users.
%% The default method is the internal.
%% If you want to use a different method, 
%% comment this line and enable the correct ones.
%%
%{auth_method, internal}.
%%
%% Authentication using external script
%% Make sure the script is executable by ejabberd.
%%
{auth_method, external, internal}.
{extauth_program, "c:\\temp\\ConsoleApplication1.exe"}.

FYI - I had issues with spaces in the path and a lack of escaped \ i.e. \\. e.g. I found this failed to work "c:\\Program Files (x86)\\ConsoleApplication1.exe" and left the server running with this error:

** {badarg,[{extauth,call_port,2},
            {ejabberd_auth_external,check_password,3},
            {ejabberd_auth,check_password_loop,2},
            {cyrsasl_plain,mech_step,2},
            {cyrsasl,server_step,2},
            {ejabberd_c2s,wait_for_feature_request,2},
            {gen_fsm,handle_msg,7},
            {proc_lib,init_p,5}]}

Anyhow the code I have working is here:

using System;
using System.IO;
using System.Text;
namespace ConsoleApplication1
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            const int maxbufferLength = 1000;		// maximum buffer len
            var outputMessage = new char[maxbufferLength];	// buffer
            var stdinStream = Console.OpenStandardInput();
            var binaryReader = new BinaryReader(stdinStream);
            while (true)
            {
                // Read data from stdin
                var b1 = binaryReader.ReadByte();
                var b2 = binaryReader.ReadByte();
                // Perform big endian conversion
                var expectedInputLength = b2 + (b1 * 256);
                // Check for buffer overrun
                if (expectedInputLength > maxbufferLength)
                {
                    throw new InternalBufferOverflowException(string.Format("{0} > {1}", expectedInputLength,
                                                                            maxbufferLength));
                }
                // Read opcode, username and password
                var bytes = binaryReader.ReadBytes(expectedInputLength);
                var data = Encoding.ASCII.GetString(bytes);
                var elements = data.Split(':');
                /*
                 * PERFORM AUTHENTICATION HERE
                 */
                // Prepare return value, first short is always 2
                outputMessage[0] = (char)0;
                outputMessage[1] = (char)2;
                // Second short is 1 for success, 0 for failure
                outputMessage[2] = (char)0;
                outputMessage[3] = (char)1; // or 0 for failure
                // Send return value
                Console.Out.Write(outputMessage, 0, 4);
            }
        }
    }
}

sizeof(char) in .NET is 2.

ooo27 — Fri, 30 Mar 2012 22:46:47 +0000

sizeof(char) in .NET is 2. This code will break if the incoming data is sufficiently large. Use a binary reader to read the correct number of bytes from stdin.

// (this should be outside your while(true) loop)
var stdinStream = Console.OpenStandardInput();
var binReader = new BinaryReader(stdinStream);
// Read data from stdin
var b1 = binReader.ReadByte();
var b2 = binReader.ReadByte();
// Perform big endian conversion
int len = b2 + (b1 * 256);
// Check for buffer overrun
if (len > maxbuflen)
    throw new InternalBufferOverflowException(string.Format("{0} > {1}", len, maxbuflen));
                    
// Read opcode, username and password
var bytes = binReader.ReadBytes(len);
var data = ASCIIEncoding.ASCII.GetString(bytes);
string[] elements = data.Split(':');
// etc etc ...

I added this page, so people

mfoss — Tue, 03 Jul 2007 17:56:32 +0000

I added this page, so people can find your example easier: check_csharp

not anonymous anymore

fcipriani — Tue, 03 Jul 2007 17:03:02 +0000

Sorry, didn't register to the site before posting. Now I have an account.
fc

ejabberd - Comments for "external authentication login script using c#"

Just thought I would include

sizeof(char) in .NET is 2.

I added this page, so people

not anonymous anymore