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We have creates a webpart and in the catch block we are writing logs to uls.

My concern is regarding permission to write to this log. Will users with read-only access to sharepoint face no issue?

 private void WriteToULS(TraceSeverity Level, string OutStr)
        {
            SPDiagnosticsService.Local.WriteTrace(0, new SPDiagnosticsCategory("Portal Error", Level, EventSeverity.Error), TraceSeverity.Unexpected, OutStr, null);
        }

I would also like to know if it a good practice to use:

private void WriteToULS(TraceSeverity Level, string OutStr)
            {
 SPSecurity.RunWithElevatedPrivileges(delegate()
                {
                SPDiagnosticsService.Local.WriteTrace(0, new SPDiagnosticsCategory("Portal Error", Level, EventSeverity.Error), TraceSeverity.Unexpected, OutStr, null);
 }); 
            }

in the code for all webparts.

|improve this question
1

Call the below method ,this will ensure you are have correct/appropriate permissions while users with read permissions write to log file.

SPSecurity RunWithElevatedPriviledges{
LogData();
}

public static void LogData(string categoryName, Level type, string section, string message, string exception)
{
    try
    {
        /*Log SharePoint*/
        SPDiagnosticsService diagnosticsService = SPDiagnosticsService.Local;
        diagnosticsService.WriteTrace(0,
                                      new SPDiagnosticsCategory(categoryName, TraceSeverity.Unexpected,
                                                                EventSeverity.Error),
                                      TraceSeverity.Unexpected, exception, exception);
    }
    catch
    {
        throw new Exception("ExceptionManager.LogData > Failed !");
    }
}

Refer for ULS logs details if required : where see the log SPDiagnosticsService WriteTrace

|improve this answer
  • This is what I mentioned :-) – Nadeem Yousuf Apr 5 '14 at 17:37
  • lol , i didnt see your comment :) – Nik J Apr 5 '14 at 22:07
  • Hi Nikhil, I tested it out and it seems that the user with only read permission can write to ULS log, it didnt give me any error. I am logging to ULS at every catch block in my webpart code.. – variable Apr 7 '14 at 4:42
  • You logged in with user with read access . But SPDiagnosticService will/always use app pool account to write to ULS logs. – Nik J Apr 7 '14 at 15:07
  • Ok, can you tell me what priviledges should the apppool account (site collection administrator) have if I donot use elevated priviledges? – variable Apr 8 '14 at 12:44
0

Users with read only access won't be able to write to ULS. Write the code inside RunWithElevatedPreviliges delegate

|improve this answer
  • I have user with read only permission and I tested it out and can confirm that the user can write to ULS log without using ElevatedPriviledges.. Can you confirm this?: – variable Apr 7 '14 at 4:41
  • Also, the RunWithElevatedPreviliges code runs under the account used during webapplication creation. So unless that user has permission to write to ULS then it will throw error? – variable Apr 10 '14 at 6:45

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