在 Ubuntu 18.04.4LTS 上的 System.DirectoryServices.Protocols 处调用 LdapConnection.SendRequest(SearchRequest req) 时出现分段错误（核心已转储）

Question

当我尝试从 Active Directory 获取用户信息时，LdapConnection.SendRequest(SearchRequest req) 导致：

Segmentation fault (core dumped)

在 Ubuntu 18.04.4 LTS（GNU/Linux 4.15.0-147-generic x86_64）.

如果我删除行

searchRequest.TimeLimit = new TimeSpan(0, 1, 0);

LdapPal.SearchDirectory 方法 returns LdapError.TimeOut (-7)。并抛出：

System.DirectoryServices.Protocols.LdapException: The LDAP server returned an unknown error.
   at System.DirectoryServices.Protocols.LdapConnection.SendRequest(DirectoryRequest request, TimeSpan requestTimeout)
   at System.DirectoryServices.Protocols.LdapConnection.SendRequest(DirectoryRequest request)
   at ConsoleApp16.Program.GetUserDetailsFromLdap(String username) in D:\source\repos\ConsoleApp16\ConsoleApp16\Program.cs:line 47

下面的代码在 Windows.

上没有任何问题

通过 LdapConnection.Bind(new NetworkCredential(username, password, domainName)) 验证用户名和密码没有任何问题。

代码如下：

    private static string _baseDn = "OU=org1,DC=org1,DC=com,DC=tr";
    private static LdapConnection _con = new(new LdapDirectoryIdentifier("org1.com.tr"), new NetworkCredential("#Username", "#Password", "#DomainName"));
    static void Main(string[] args)
    {
        _con.AuthType = AuthType.Basic;

        Console.ReadLine();
        Console.WriteLine("Hello World!");

        Console.WriteLine(TryLoginUser(@"#Username", "#Password","#DomainName"));

        Console.WriteLine(GetUserDetailsFromLdap(@"#Username").Email);
    }

    private static bool TryLoginUser(string username, string password, string domainName)
    {
        try
        {
            _con.Bind(new NetworkCredential(username, password, domainName));
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.ToString());
            return false;
        }
        return true;
    }

    private static LdapUser GetUserDetailsFromLdap(string username)
    {
        var searchFilter = $"(&sAMAccountName={username.Split('@')[0]})";

        var searchRequest = new SearchRequest(_baseDn, searchFilter, SearchScope.Subtree, new string[] { "mail", "givenName", "sn", "sAMAccountName" });
        searchRequest.TimeLimit = new TimeSpan(0, 1, 0);

        try
        {
            
            var response = (SearchResponse)_con.SendRequest(searchRequest);
            if (response?.ResultCode == ResultCode.Success)
            {
                var result = response?.Entries[0];
                return new LdapUser()
                {
                    Email = result.Attributes["mail"][0].ToString(),
                    FirstName = result.Attributes["givenName"][0].ToString(),
                    LastName = result.Attributes["sn"][0].ToString(),
                    UserName = result.Attributes["sAMAccountName"][0].ToString()
                };
            }
            else
            {
                return null;
            }

        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.ToString());
        }
        return null;
    }
}

public class LdapUser
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string Email { get; set; }
    public string UserName { get; set; }
}

配置

System.DirectoryServices.Protocols 版本 5.0.0

运行时间：Microsoft.NETCore.App5.0.7

目标运行时：可移植

部署模式：便携式

更新当使用 6.0.0-preview.7.21377.19 版本的 System.DirectoryServices.Protocols 而没有 SearchRequest.TimeLimit 属性会导致：

System.DirectoryServices.Protocols.LdapException: The search filter is invalid.
   at System.DirectoryServices.Protocols.LdapConnection.SendRequest(DirectoryRequest request, TimeSpan requestTimeout)
   at System.DirectoryServices.Protocols.LdapConnection.SendRequest(DirectoryRequest request)
   at ConsoleApp16.Program.GetUserDetailsFromLdap(String username) in D:\source\repos\ConsoleApp16\ConsoleApp16\Program.cs:line 47

private static LdapConnection _con = new(new LdapDirectoryIdentifier("org1.com.tr"));

bool isWindows = System.Runtime.InteropServices.RuntimeInformation.IsOSPlatform(System.Runtime.InteropServices.OSPlatform.Windows);
            
var searchFilter =isWindows?$"(&sAMAccountName={username.Split('@')[0]})": $"(&(objectCategory=person)(objectclass=user)(sAMAccountName={username.Split('@')[0]}))";

如果我将 searchFilter 设置为操作系统条件，大多数时候方法都会成功执行，即使我没有为 LDAPConnection 对象设置凭据也是如此。

但是它继续随机抛出

System.DirectoryServices.Protocols.LdapException: The LDAP server returned an unknown error.

Answer 1

当我将 LdapConnection.SessionOptions.ProtocolVersion 设置为 3 时，Linux 上的一切也都按预期工作。

在 Ubuntu 18.04.4LTS 上的 System.DirectoryServices.Protocols 处调用 LdapConnection.SendRequest(SearchRequest req) 时出现分段错误（核心已转储）

Segmentation fault (core dumped) when calling LdapConnection.SendRequest(SearchRequest req) at System.DirectoryServices.Protocols on Ubuntu 18.04.4LTS

linux

.net-core

ldap

directoryservices