LdapForNet 1.0.1

ldap4net

Port of OpenLdap Client library (https://www.openldap.org/software/man.cgi?query=ldap) to DotNet Core

It works with any LDAP protocol compatible directory server (including Microsoft Active Directory).

Supported SASL GSSAPI (Kerberos) authentication!

Sample usage (GSSAPI authentication)

using (var cn = new LdapConnection())
{
	// connect
	cn.Connect();
	// bind using kerberos credential cache file
	cn.Bind();
	// call ldap op
	var entries = cn.Search("<<basedn>>", "(objectClass=*)");
}

Overview

• Supported platforms
• Installation
• API
  • Connect
  • Bind
  • Search
  • SearchByCn
  • SearchBySid
  • SetOption
  • Add
  • Modify
  • Delete
  • Rename
  • GetNativeLdapPtr
  • Native
  • License
  • Authors

Supported platforms

• Most of popular Linux distributives
• Supported on the .NET Standard - minimum required is 2.0 - compatible .NET runtimes: .NET Core, Mono.

Installation

Install-Package LdapForNet -Version 0.1.0-beta

dotnet add package LdapForNet --version 0.1.0-beta

Api

Connect

using (var cn = new LdapConnection())
{
	// connect use Domain Controller host from computer hostname and default port 389
	// Computer hostname - mycomp.example.com => DC host - example.com
	cn.Connect();
	....
}

using (var cn = new LdapConnection())
{
	// connect use hostname and port
	cn.Connect("dc.example.com",636);
	....
}

Bind

using (var cn = new LdapConnection())
{
	cn.Connect();
	// bind using kerberos credential cache file
	cn.Bind();
	...
}

using (var cn = new LdapConnection())
{
	cn.Connect("ldap.forumsys.com");
	// bind using userdn and password
	cn.Bind(LdapAuthMechanism.SIMPLE,"cn=read-only-admin,dc=example,dc=com","password");
	...
}

Search

using (var cn = new LdapConnection())
{
	cn.Connect();
	cn.Bind();
	//search all objects in catalog (default search scope = LdapSearchScope.LDAP_SCOPE_SUBTREE)
	var entries = cn.Search("dc=example,dc=com","(objectClass=*)");
}

using (var cn = new LdapConnection())
{
	cn.Connect();
	cn.Bind();
	//search  objects in catalog at first level scope
	var entries = cn.Search("dc=example,dc=com","(objectClass=*)", LdapSearchScope.LDAP_SCOPE_ONELEVEL);
}

SearchByCn

using (var cn = new LdapConnection())
{
	cn.Connect();
	cn.Bind();
	//search  by CN, get @base from machine hostname (my.example.com => dn=example,dn=com )
	var entries = cn.SearchByCn("read-only-admin");
}

using (var cn = new LdapConnection())
{
	cn.Connect();
	cn.Bind();
	//search  by CN
	var entries = cn.SearchByCn("ou=admins,dn=example,dn=com", "read-only-admin", LdapSearchScope.LDAP_SCOPE_ONELEVEL);
}

SearchBySid

using (var cn = new LdapConnection())
{
	cn.Connect();
	cn.Bind();
	//search  by CN, get @base from machine hostname (my.example.com => dn=example,dn=com )
	var entries = cn.SearchBySid("S-1-5-21-2127521184-1604012920-1887927527-72713");
}

using (var cn = new LdapConnection())
{
	cn.Connect();
	cn.Bind();
	//search  by CN
	var entries = cn.SearchBySid("ou=admins,dn=example,dn=com", "S-1-5-21-2127521184-1604012920-1887927527-72713", LdapSearchScope.LDAP_SCOPE_ONELEVEL);
}

SetOption

using (var cn = new LdapConnection())
{
	cn.Connect();
	var ldapVersion = (int)LdapVersion.LDAP_VERSION3;
	cn.SetOption(LdapOption.LDAP_OPT_PROTOCOL_VERSION, ref ldapVersion);
	cn.Bind();
}

Add

using (var cn = new LdapConnection())
{
	cn.Connect();
	cn.Bind();
	cn.Add(new LdapEntry
	{
	Dn = "cn=test,dc=example,dc=com",
	Attributes = new Dictionary<string, List<string>>
	{
	    {"sn", new List<string> {"Winston"}},
	    {"objectclass", new List<string> {"inetOrgPerson"}},
	    {"givenName", new List<string> {"your_name"}},
	    {"description", new List<string> {"your_description"}}
	}
	});
}

Modify

using (var cn = new LdapConnection())
{
	cn.Connect();
	cn.Bind();
	cn.Modify(new LdapModifyEntry
	{
	Dn = "cn=test,dc=example,dc=com",
	Attributes = new List<LdapModifyAttribute>
	{
	    new LdapModifyAttribute
	    {
		LdapModOperation = LdapModOperation.LDAP_MOD_REPLACE,
		Type = "givenName",
		Values = new List<string> {"test_value_2"}
	    },
	    new LdapModifyAttribute
	    {
		LdapModOperation = LdapModOperation.LDAP_MOD_ADD,
		Type = "displayName",
		Values = new List<string> {"test_display_name"}
	    },
	    new LdapModifyAttribute
	    {
		LdapModOperation = LdapModOperation.LDAP_MOD_ADD,
		Type = "sn",
		Values = new List<string> {"test"}
	    },
	    new LdapModifyAttribute
	    {
		LdapModOperation = LdapModOperation.LDAP_MOD_DELETE,
		Type = "description",
		Values = new List<string> {"test_value"}
	    }
	}
	});
}

Delete

using (var cn = new LdapConnection())
{
	cn.Connect();
	cn.Bind();
	cn.Delete("cn=test,dc=example,dc=com");
}

Rename

using (var cn = new LdapConnection())
{
	cn.Connect();
	cn.Bind();
	cn.Rename("cn=test,dc=example,dc=com", "cn=test2", null, true);
}

GetNativeLdapPtr

For own implementations or not implemented OpenLdap functions use GetNativeLdapPtr. It's provided pointer to native structure LDAP. So we can use this pointer in own implementations. For example, implement "DIGEST-MD5" authentication

using static LdapForNet.Native.Native;

using (var cn = new LdapConnection())
{
	cn.Connect();
	var ld = cn.GetNativeLdapPtr();
	var defaults = new LdapSaslDefaults { 
		mech = "DIGEST-MD5",
		passwd="password",
        	authcid="user",
        	realm="realm.com",
        	authzid="user"
	};
	var ptr = Marshal.AllocHGlobal(Marshal.SizeOf(defaults));
            Marshal.StructureToPtr(defaults, ptr, false);
	int rc = ldap_sasl_interactive_bind_s( ld, null,defaults.mech, IntPtr.Zero, IntPtr.Zero,
                (uint)LdapInteractionFlags.LDAP_SASL_QUIET, (l, flags, d, interact) => (int)LdapResultCode.LDAP_SUCCESS, ptr);
...
}

Native

OpenLdap native methods can be used directly. Native methods implemented in static class LdapForNet.Native.Native:

using static LdapForNet.Native.Native;

using (var cn = new LdapConnection())
{
	cn.Connect();
	var ld = cn.GetNativeLdapPtr();
	var res = ldap_sasl_interactive_bind_s(ld,...);
	if (res != (int)LdapResultCode.LDAP_SUCCESS)
	{
		Trace.TraceError($"Error {method}: {LdapError2String(res)} ({res}).");
	}
}

License

This software is distributed under the terms of the MIT License (MIT).

Authors

Alexander Chermyanin / LinkedIn

Contributions and bugs reports are welcome.