DocSpace-client/common/ASC.ActiveDirectory/Base/LdapHelper.cs

/*
 *
 * (c) Copyright Ascensio System Limited 2010-2021
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
*/


namespace ASC.ActiveDirectory.Base;
[Scope]
public abstract class LdapHelper : IDisposable
{
    public LdapSettings Settings { get; private set; }
    public abstract bool IsConnected { get; }

    protected readonly ILog Log;
    protected readonly InstanceCrypto InstanceCrypto;

    protected LdapHelper(
        IOptionsMonitor<ILog> option,
        InstanceCrypto instanceCrypto)
    {
        Log = option.Get("ASC");
        InstanceCrypto = instanceCrypto;
    }

    public void Init(LdapSettings settings)
    {
        Settings = settings;
    }

    public abstract void Connect();

    public abstract Dictionary<string, string[]> GetCapabilities();

    public abstract string SearchDomain();

    public abstract void CheckCredentials(string login, string password, string server, int portNumber,
        bool startTls, bool ssl, bool acceptCertificate, string acceptCertificateHash);

    public abstract bool CheckUserDn(string userDn);

    public abstract List<LdapObject> GetUsers(string filter = null, int limit = -1);

    public abstract LdapObject GetUserBySid(string sid);

    public abstract bool CheckGroupDn(string groupDn);

    public abstract List<LdapObject> GetGroups(Criteria criteria = null);

    public bool UserExistsInGroup(LdapObject domainGroup, LdapObject domainUser, LdapSettings settings) // string memberString, string groupAttribute, string primaryGroupId)
    {
        try
        {
            if (domainGroup == null || domainUser == null)
                return false;

            var memberString = domainUser.GetValue(Settings.UserAttribute) as string;
            if (string.IsNullOrEmpty(memberString))
                return false;

            var groupAttribute = settings.GroupAttribute;
            if (string.IsNullOrEmpty(groupAttribute))
                return false;

            var userPrimaryGroupId = domainUser.GetValue(LdapConstants.ADSchemaAttributes.PRIMARY_GROUP_ID) as string;

            if (!string.IsNullOrEmpty(userPrimaryGroupId) && domainGroup.Sid.EndsWith("-" + userPrimaryGroupId))
            {
                // Domain Users found
                return true;
            }
            else
            {
                var members = domainGroup.GetValues(groupAttribute);

                if (members.Count == 0)
                    return false;

                if (members.Any(member => memberString.Equals(member, StringComparison.InvariantCultureIgnoreCase)
                    || member.Equals(domainUser.DistinguishedName, StringComparison.InvariantCultureIgnoreCase)))
                    return true;
            }
        }
        catch (Exception e)
        {
            Log.ErrorFormat("UserExistsInGroup() failed. Error: {0}", e);
        }

        return false;
    }

    public string GetPassword(byte[] passwordBytes)
    {
        if (passwordBytes == null || passwordBytes.Length == 0)
            return string.Empty;

        string password;
        try
        {
            password = InstanceCrypto.Decrypt(passwordBytes, new UnicodeEncoding());
        }
        catch (Exception)
        {
            password = string.Empty;
        }
        return password;
    }

    public byte[] GetPasswordBytes(string password)
    {
        byte[] passwordBytes;

        try
        {
            passwordBytes = InstanceCrypto.Encrypt(new UnicodeEncoding().GetBytes(password));
        }
        catch (Exception)
        {
            passwordBytes = Array.Empty<byte>();
        }

        return passwordBytes;
    }

    public abstract void Dispose();
}