Develop Reference

Exception while getting sAMAccountName from DirectroryEntry

I am using DirectorySearcher to get AD groups from LDAP. The below code works when I fetch the property "cn" from DirectoryEntry and it throws an exception when "sAMAccountName" is selected. The property does exist as you can see that I search based on sAMAccountName.
Exception is
"Exception Details: System.Runtime.InteropServices.COMException:
Unknown error (0x8000500c)"
[COMException (0x8000500c): Unknown error (0x8000500c)]
System.DirectoryServices.PropertyValueCollection.PopulateList()
+519959 System.DirectoryServices.PropertyValueCollection..ctor(DirectoryEntry
entry, String propertyName) +119
System.DirectoryServices.PropertyCollection.get_Item(String
propertyName) +162
ASP._Page_app_tools_active_directory_cshtml.SearchADGroups(List1 Fields, String DomainName) in d:\inetpub\wwwroot\app\tools\active_directory.cshtml:371 ASP._Page_app_tools_active_directory_cshtml.Execute() in d:\inetpub\wwwroot\app\tools\active_directory.cshtml:154 System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +252 System.Web.WebPages.WebPage.ExecutePageHierarchy(IEnumerable1
executors) +99 System.Web.WebPages.WebPage.ExecutePageHierarchy()
+182 System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext
pageContext, TextWriter writer, WebPageRenderingBase startPage) +107
System.Web.WebPages.WebPageHttpHandler.ProcessRequestInternal(HttpContextBase
httpContext) +142
List<ADGroup> Groups = new List<ADGroup>();
using (DirectoryEntry dEntry = new DirectoryEntry("LDAP://" + DomainName))
{
using (DirectorySearcher gSearch = new DirectorySearcher())
{
gSearch.SearchRoot = dEntry;
if(GroupName != "")
{
gSearch.Filter = String.Format("(&(objectClass=group)(samaccountname=*{0}*))", GroupName);
gSearch.SearchScope = SearchScope.Subtree;
gSearch.PropertiesToLoad.Add("sAMAccountName");
SearchResultCollection group_results = gSearch.FindAll();
foreach (SearchResult group_result in group_results)
{
if(group_result != null)
{
DirectoryEntry group_entry = group_result.GetDirectoryEntry();
group_entry.Properties["cn"].Value.ToString()
group_entry.Properties["sAMAccountName"].Value.ToString()
}
}
}
}
}
I expect the value for sAMAccountName

NullPointerException while Querying for mapped CustomObject

I have following code:
ActiveModule resultObject = null;
StringBuilder sqlStringBuilder = new StringBuilder();
sqlStringBuilder.AppendLine("SELECT * FROM suite_activemodule as _module");
sqlStringBuilder.AppendLine("WHERE CityID = #CityID AND BaseModuleID = #BaseModuleID");
using (MySqlConnection connection = new MySqlConnection(ConnectionString))
{
var _resultList = connection.Query<ActiveModule>(sqlStringBuilder.ToString(), new { CityID = cityID, ModuleID = moduleID }, null, true, null, null); //<- This is were I get the error...
int listSize = _resultList.Count();
if (_resultList != null && !_resultList.Count().Equals(0))
{
resultObject = _resultList.ToList().First();
resultObject.Module = BaseModuleRepository.GetByID(resultObject.ModuleID);
}
}
The query itself works fine but as soon as I try to run the query I get the following error message:
bei MySql.Data.MySqlClient.MySqlConnection.get_ServerThread()
bei MySql.Data.MySqlClient.MySqlConnection.Abort()
bei MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior
behavior)
bei Dapper.SqlMapper.ExecuteReaderWithFlagsFallback(IDbCommand cmd,
Boolean wasClosed, CommandBehavior behavior) in
C:\projects\dapper\Dapper\SqlMapper.cs:Zeile 1053.
bei Dapper.SqlMapper.d__138`1.MoveNext() in
C:\projects\dapper\Dapper\SqlMapper.cs:Zeile 1081.
bei System.Collections.Generic.List1..ctor(IEnumerable1 collection)
bei System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
bei Dapper.SqlMapper.Query[T](IDbConnection cnn, String sql, Object
param, IDbTransaction transaction, Boolean buffered, Nullable1
commandTimeout, Nullable1 commandType) in
C:\projects\dapper\Dapper\SqlMapper.cs:Zeile 723.
...Repository.GetByCityIDAndModuleID(Int64 cityID, Int64 moduleID)
...DeactivateModule(String moduleID)
But I am running multiple queries like this kind before and dont get this error. It don't make that much sense because nothing of the used stuff is really null.
I have already did a clean build and also a full rebuild via Visual Studio.
Does anyone know about this issue and know how to fix it?

As mentioned in the comments, the NullReferenceException can be fixed by assigning the 'BaseModuleID' in your call to Query<>() like this:
var _resultList = connection.Query<ActiveModule>(sqlStringBuilder.ToString(), new { CityID = cityID, BaseModuleID = moduleID }, null, true, null, null);
Another suggestion: you are calling _resultList.Count() twice. If your query returns a large # of results, this could be expensive. Since you are only processing the first item in the list, you could use FirstOrDefault() on the list instead of Count(). Or, even better, you could use QueryFirstOrDefault<>() on the MySqlConnection like this:
ActiveModule resultObject = null;
StringBuilder sqlStringBuilder = new StringBuilder();
sqlStringBuilder.AppendLine("SELECT * FROM suite_activemodule as _module");
sqlStringBuilder.AppendLine("WHERE CityID = #CityID AND BaseModuleID = #BaseModuleID");
using (MySqlConnection connection = new MySqlConnection(ConnectionString))
{
resultObject = connection.QueryFirstOrDefault<ActiveModule>(sqlStringBuilder.ToString(), new { CityID = cityID, BaseModuleID = moduleID });
if (resultObject != null)
{
resultObject.Module = BaseModuleRepository.GetByID(resultObject.ModuleID);
}
}
Good luck!

Connecting to LDAP server throws NullReferenceException

I am trying to connect to the online test LDAP server specified here using System.DirectoryServices.AccountManagement like this:
try
{
using (PrincipalContext ctx = new PrincipalContext(ContextType.Domain, "ldap.forumsys.com:389", "dc=example,dc=com", "cn=read-only-admin,dc=example,dc=com", "password"))
{
using (var searcher = new PrincipalSearcher(new UserPrincipal(ctx )))
{
foreach (var result in searcher.FindAll().Take(usersCount))
{
DirectoryEntry de = result.GetUnderlyingObject() as DirectoryEntry;
}
}
}
}
catch(Exception ex)
{
Console.WriteLine(ex.Message);
}
But it throws the following exception:
Object reference not set to an instance of an object.
Could you please tell what is wrong with my code and how to be able to connect to that LDAP server?
PS: I am able to connect to that server using Apache Directory Studio
Stack Trace :
at System.DirectoryServices.AccountManagement.PrincipalContext.ReadServerConfig(String serverName, ServerProperties& properties)
at System.DirectoryServices.AccountManagement.PrincipalContext.DoServerVerifyAndPropRetrieval()
at System.DirectoryServices.AccountManagement.PrincipalContext..ctor(ContextType contextType, String name, String container, ContextOptions options, String userName, String password)
at System.DirectoryServices.AccountManagement.PrincipalContext..ctor(ContextType contextType, String name, String container, String userName, String password)
at ConsoleApp1.Program.GetGroups(String userName) in C:\Users\Simple Code\source\repos\ConsoleApp1\ConsoleApp1\Program.cs:line 48

As said here, the problem could be that you try to connect to an Apache Directory Studio with the class PrincipalContext that not supports this OpenLDAP,
so one way to go is using the DirectoryEntry class

Using DirectoryEntry it works for me as following:
using (var searcher = new DirectorySearcher(new DirectoryEntry("LDAP://ldap.forumsys.com:389/dc=example,dc=com", "", "", AuthenticationTypes.None)))
{
searcher.Filter = "((objectClass=person))";
searcher.PropertiesToLoad.Add("mail");//email
searcher.PropertiesToLoad.Add("givenName");//first name
searcher.PropertiesToLoad.Add("sn"); //last name
searcher.PropertiesToLoad.Add("telephoneNumber");
searcher.PropertiesToLoad.Add("description");
searcher.PropertiesToLoad.Add("memberOf"); // groups
var activeDirectoryStaffs = searcher.FindAll();
if (activeDirectoryStaffs != null)
{
for (int i = 0; i < activeDirectoryStaffs.Count; i++)
{
SearchResult result = activeDirectoryStaffs[i];
var Email = result.Properties.Contains("mail") ? (string)result.Properties["mail"][0]:null;
var Mobile = result.Properties.Contains("telephoneNumber") ? (string)result.Properties["telephoneNumber"][0] : null;
var FirstName = result.Properties.Contains("givenName") ? (string)result.Properties["givenName"][0] : null;
var LastName = result.Properties.Contains("sn") ? (string)result.Properties["sn"][0] : null;
var Description = result.Properties.Contains("description") ? (string)result.Properties["description"][0] : null;
}
}
}

UserPrincipal with context that uses SSL

I have a PrincipalContext that uses SSL. This works fine when using a method like Context.ValidateCredentials(). But when I need to find a user using UserPrincipal.FindByIdentity() I get the following error:
System.Runtime.InteropServices.COMException: The server is unwilling to process the request.
at System.DirectoryServices.DirectoryEntry.Bind(Boolean throwIfFail)
at System.DirectoryServices.DirectoryEntry.Bind()
at System.DirectoryServices.DirectoryEntry.get_SchemaEntry()
at System.DirectoryServices.AccountManagement.ADStoreCtx.IsContainer(DirectoryEntry de)
at System.DirectoryServices.AccountManagement.ADStoreCtx..ctor(DirectoryEntry ctxBase, Boolean ownCtxBase, String username, String password, ContextOptions options)
at System.DirectoryServices.AccountManagement.PrincipalContext.CreateContextFromDirectoryEntry(DirectoryEntry entry)
at System.DirectoryServices.AccountManagement.PrincipalContext.DoLDAPDirectoryInit()
--- End of inner exception stack trace ---
at System.DirectoryServices.AccountManagement.PrincipalContext.DoLDAPDirectoryInit()
at System.DirectoryServices.AccountManagement.PrincipalContext.DoDomainInit()
at System.DirectoryServices.AccountManagement.PrincipalContext.Initialize()
at System.DirectoryServices.AccountManagement.PrincipalContext.get_QueryCtx()
at System.DirectoryServices.AccountManagement.Principal.FindByIdentityWithTypeHelper(PrincipalContext context, Type principalType, Nullable`1 identityType, String identityValue, DateTime refDate)
at System.DirectoryServices.AccountManagement.Principal.FindByIdentityWithType(PrincipalContext context, Type principalType, String identityValue)
at System.DirectoryServices.AccountManagement.UserPrincipal.FindByIdentity(PrincipalContext context, String identityValue)
My method:
public List<string> GetUserInfo(string user) {
var list = new List<string>();
using (var context = new PrincipalContext(ContextType.Domain, "xxxx.xxxx.xxxx:636", "DC=xxxx,DC=xxxx,DC=xxxx", ContextOptions.SimpleBind | ContextOptions.Sealing | ContextOptions.SecureSocketLayer)) {
var uP = UserPrincipal.FindByIdentity(context, IdentityType.SamAccountName, user);
//Do stuff with uP
return list;
}
But this is working fine:
public bool ValidateCredentials(string username, string password) {
using (var context = new PrincipalContext(ContextType.Domain, "xxxx.xxxx.xxxx:636", "DC=xxxx,DC=xxxx,DC=xxxx", ContextOptions.SimpleBind | ContextOptions.Sealing | ContextOptions.SecureSocketLayer)) {
return context.ValidateCredentials(username, password);
}
}
How come I cant work with UserPrincipal using the Context with SSL? If I remove SSL it works fine..

I changed my ContextOptions to Negotiate and SSL. Then it worked

Unfortunately there are not enough code examples that show how to configure PrincipalContext or DirectoryEntry to use LDAPS (SSL Active Directory). I have found these solutions for this issue:
Configure PrincipalContext to use LDAPS:
var path = "test.domainName.local:636";
ContextOptions options = ContextOptions.Negotiate | ContextOptions.SecureSocketLayer;
using (var context = new PrincipalContext(ContextType.Domain, path, "DC=xyz,DC=local", options))
{
pr("Name: " + context.Name);
pr("ConnectedServer: " + context.ConnectedServer);
pr("Container: " + context.Container);
pr("UserName: " + context.UserName);
}
Configure DirectoryEntry to use LDAPS:
string path = "LDAP://test.domainName.local:636";
var dic = new DirectoryEntry(path);
pr("Name: " + dic.Name);
pr("Path: " + dic.Path);
pr("AuthenticationType: " + dic.AuthenticationType);
pr("SchemaClassName: " + dic.SchemaClassName);
pr("Username: " + dic.Username);

C#/SQL Parse Error

I am trying to build a register user script using C# and SQL. However when wver I try to add the users details to the database I run into a parse error. This error is below
There was an error parsing the query. [ Token line number = 1,Token line offset = 38,Token in error = = ]
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Data.SqlServerCe.SqlCeException: There was an error parsing the query. [ Token line number = 1,Token line offset = 38,Token in error = = ]
Source Error:
Line 48: {
Line 49: var db = Database.Open("Database");
Line 50: var users = db.QuerySingle("SELECT * FROM Users WHERE Username = ", username);
Line 51: if (users == null)
Line 52: {
Source File: c:\Users\***\Documents\Visual Studio 2012\WebSites\CatSystem\Account\Login.cshtml Line: 50
Stack Trace:
[SqlCeException (0x80004005): There was an error parsing the query. [ Token line number = 1,Token line offset = 38,Token in error = = ]]
System.Data.SqlServerCe.SqlCeCommand.ProcessResults(Int32 hr) +136
System.Data.SqlServerCe.SqlCeCommand.CompileQueryPlan() +798
System.Data.SqlServerCe.SqlCeCommand.ExecuteCommand(CommandBehavior behavior, String method, ResultSetOptions options) +363
System.Data.SqlServerCe.SqlCeCommand.ExecuteReader(CommandBehavior behavior) +59
System.Data.SqlServerCe.SqlCeCommand.ExecuteDbDataReader(CommandBehavior behavior) +41
System.Data.Common.DbCommand.ExecuteReader() +12
WebMatrix.Data.<QueryInternal>d__0.MoveNext() +152
System.Linq.Enumerable.FirstOrDefault(IEnumerable`1 source) +164
WebMatrix.Data.Database.QuerySingle(String commandText, Object[] args) +103
ASP._Page_Account_Login_cshtml.Execute() in c:\Users\***\Documents\Visual Studio 2012\WebSites\CatSystem\Account\Login.cshtml:50
System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +197
System.Web.WebPages.WebPage.ExecutePageHierarchy(IEnumerable`1 executors) +69
System.Web.WebPages.WebPage.ExecutePageHierarchy() +151
System.Web.WebPages.StartPage.RunPage() +17
System.Web.WebPages.StartPage.ExecutePageHierarchy() +62
System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +76
System.Web.WebPages.WebPageHttpHandler.ProcessRequestInternal(HttpContext context) +249
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.18010
The script I am using is
#{// Initialize page
var email = "";
var username = "";
var password = "";
var confirmPassword = "";
var firstname = "";
var lastname = "";
var housenumberorname = "";
var street = "";
var city = "";
var county = "";
var postcode = "";
var tel = "";
var mobile = "";
var dob = "";
var ErrorMessage = "";
// If this is a POST request, validate and process data
if (IsPost)
{
email = Request.Form["email"];
username = Request.Form["username"];
password = Request.Form["password"];
confirmPassword = Request.Form["confirmPassword"];
firstname = Request.Form["firstname"];
lastname = Request.Form["lastname"];
housenumberorname = Request.Form["housenumberorname"];
street = Request.Form["street"];
city = Request.Form["city"];
county = Request.Form["county"];
postcode = Request.Form["postcode"];
tel = Request.Form["tel"];
mobile = Request.Form["mobile"];
dob = Request.Form["dob"];
if (username.IsEmpty() || password.IsEmpty()) {
ErrorMessage = "You must specify both email and password.";
}
if (password != confirmPassword)
{
ErrorMessage = "Password and confirmation do not match.";
}
// If all information is valid, create a new account
if (ErrorMessage=="")
{
var db = Database.Open("Database");
var user = db.QuerySingle("SELECT * FROM Users WHERE Username = ", username);
if (user == null)
{
db.Execute("INSERT INTO User (Username, Password, Firstname, Lastname, House, Street, City, County, Postscode, Tel, Mobile, Email, Dob) VALUES (#0, #1, #2, #3, #4, #5, #6, #7, #8, #9, #10, #11, #12)", username, password, firstname, lastname, housenumberorname, street, city, county, postcode, tel, mobile, email, dob);
WebSecurity.CreateAccount(username, password, false);
// Navigate back to the homepage and exit
Response.Redirect("~/");
}
else
{
ErrorMessage = "Email address is already in use.";
}
}
}
}
#if (ErrorMessage!="")
{
<p>#ErrorMessage</p>
<p>Please correct the errors and try again.</p>
}
I assume there is something wrong with the SQL command but as I am unfamiliar with MS SQL I can not see the issue. Any help with this would be appreciated.

The SQL is not valid. If Username is a VARCHAR or CHAR type, you need to enclose the value in ', though a better option is to use a parameterized query, as using string concatenation/formatting means your application is open to SQL Injection .
var users = db.QuerySingle(
string.Format("SELECT * FROM Users WHERE Username = '{0}'",
username));

You should change your code to use the parametrization as you have in your insert:
var user = db.QuerySingle("SELECT * FROM Users WHERE Username = #0", username);
Currently your query does not contain the username from username it is just
SELECT * FROM Users WHERE Username =
Which is invalid sytax.
From : http://wekeroad.com/2011/01/13/someone-hit-their-head
var db = Database.Open("TDL");
var selectQueryString = "SELECT * FROM Articles WHERE slug = #0";
show = db.QuerySingle(selectQueryString, slug);