private Task <T> SearchForAsync <T>(string query, string[] attributes, Func <LdapEntry, T> mappingFunc) where T : class
{
if (string.IsNullOrEmpty(query))
{
throw new ArgumentException("Query cannot be null or empty", nameof(query));
}
if (!Regex.IsMatch(query, @"^[a-z][a-z0-9\\_]+$", RegexOptions.IgnoreCase))
{
_logger.LogInformation("Invalid characters in query {query}, returning null.", query);
return(null);
}
LdapConfiguration configuration = GetLdapConfiguration();
using LdapConnection connection = new LdapConnection();
connection.Connect(configuration.Server, 389);
connection.Bind(configuration.Username, configuration.Password);
var searchResults = connection.Search(
configuration.DistinguishedName,
LdapConnection.ScopeSub,
$"(&(objectCategory=person)(objectClass=user)(sAMAccountName={query}))",
attributes,
false);
if (searchResults.HasMore())
{
LdapEntry entry = searchResults.Next();
return(Task.FromResult(mappingFunc(entry)));
}
return(Task.FromResult((T)null)); // not found
}
private LdapConfiguration GetLdapConfiguration()
{
var section = _configuration.GetSection("LDAP");
var configuration = new LdapConfiguration
{
Server = section["Server"],
DistinguishedName = section["DistinguishedName"],
Username = section["Username"],
Password = section["Password"],
};
// TODO: check that all of these are configured, log error if they are not
List <string> missingSettings = new List <string>();
if (string.IsNullOrEmpty(configuration.Server))
{
missingSettings.Add(nameof(configuration.Server));
}
if (string.IsNullOrEmpty(configuration.DistinguishedName))
{
missingSettings.Add(nameof(configuration.DistinguishedName));
}
if (string.IsNullOrEmpty(configuration.Username))
{
missingSettings.Add(nameof(configuration.Username));
}
if (string.IsNullOrEmpty(configuration.Password))
{
missingSettings.Add(nameof(configuration.Password));
}
if (missingSettings.Count != 0)
{
string joinedSettings = string.Join(", ", missingSettings.ToArray());
throw new ConfigurationErrorsException("Missing LDAP configuration settings: " + joinedSettings + ".");
}
return(configuration);
}