BindAsync on Linux

[Mariastakh]

Hello,

Great library so far, got a little issue.

The bug
Running BindAsync on Linux causes a null reference exception

An unhandled exception has occurred while executing the request.
System.NullReferenceException: Object reference not set to an instance of an object.
   at LdapForNet.Native.LdapNativeLinux.<>c__DisplayClass10_0.<BindSimpleAsync>b__0()
   at System.Threading.Tasks.Task`1.InnerInvoke()
   at System.Threading.Tasks.Task.<>c.<.cctor>b__274_0(Object obj)
   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location where exception was thrown ---
   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
--- End of stack trace from previous location where exception was thrown ---
   at LdapForNet.Native.LdapNativeLinux.BindSimpleAsync(SafeHandle ld, String userDn, String password, LDAP_TIMEVAL timeout)
   at LdapForNet.LdapConnection.BindAsync(LdapAuthType authType, LdapCredential ldapCredential)
   at LdapClient.Hello() in /path/to/the/Project/LdapClient.cs:line 16

To Reproduce

using var cn = new LdapConnection();
cn.Connect(new Uri("ldaps://example.co.uk"));
await cn.BindAsync(LdapAuthType.Simple, new LdapCredential());

Expected behaviour
Expected bind to be successful and to receive search results, however got a null reference exception from BindAsync(). The non async version of Bind() works fine by the way.

Desktop:

• OS: [Linux]
• Library version [2.7.11]
• .NET\core\mono version [3.1]
• LDAP server [OpenLdap 2.4.54-1]

[flamencist]

Hello! For simple auth binding you should specify username/dn and password.

[Mariastakh]

Hi! Thank you for your swift reply

It still fails with

await cn.BindAsync(LdapAuthType.Anonymous, new LdapCredential());

With the same error

System.NullReferenceException : Object reference not set to an instance of an object.
  Stack Trace:
     at LdapForNet.Native.LdapNativeLinux.<>c__DisplayClass10_0.<BindSimpleAsync>b__0()
   at System.Threading.Tasks.Task`1.InnerInvoke()
   at System.Threading.Tasks.Task.<>c.<.cctor>b__274_0(Object obj)
   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location where exception was thrown ---
   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
--- End of stack trace from previous location where exception was thrown ---
   at LdapForNet.Native.LdapNativeLinux.BindSimpleAsync(SafeHandle ld, String userDn, String password, LDAP_TIMEVAL timeout)
   at LdapForNet.LdapConnection.BindAsync(LdapAuthType authType, LdapCredential ldapCredential)
   at LdapClient.Hello() in path/to/Project/LdapClient.cs:line 16

It works with BindAsync on windows, and it works with Bind but not BindAsync on Linux.

We have managed to replicate the issue in docker and the set up is

FROM mcr.microsoft.com/dotnet/core/sdk:3.1
RUN apt-get update
RUN apt-get install ldap-utils -y

[flamencist]

What linux distributive ?

[Mariastakh]

The distribution is Manjaro

We've just uploaded a repository over here with an example that reproduces the error

https://github.com/millsaj/ldapfornet-test

From trying to isolate the issue, it looks like BindAsync on Linux either doesn't like binding using LdapAuthType.Anonymous, or it does not like connecting over secure LDAP