Uncategorized

IE11 on Win7: no password sent during Basic Authentication

Posted on by cly

Today I set up a download directory for one of our customers. I turned on basic authentication, gave a nice /=%27gujdw765 password and tried out from Firefox.
Everything worked. Then I tried via IE11. IE started to prompt me for credentials again and again.

I checked error log on webserver and found password mismatch messages. Tried again with same results.
Tried on my second machine with same results again.

I sent over the info to my deskmate. He tried the same in IE and it worked for him!
What the hell is happening to my machines?

I modified apache config to log Authorization header value: 

CustomLog ${APACHE_LOG_DIR}/access.log  "\"%{Authorization}i\""

Now from access log it becomes clear, that my IE does not send my password over the wire!
E.g. in case of typed user name “myuser” and password “blahblah”:

"Basic bXl1c2VyOgo="

I started some experiments and found that sometimes the password was sent sometimes not.
But why?

You will never guess.

Because I was copy&pasing that nice password via clipboard AND used Shift+Insert key combination for pasting!
When I was doing my experiments I was typing directly “12345” into password field and it was sent gracefully.
My deskmate was using Ctrl+V which was working too.
But no one was able to send the password pasted via Shift+Insert!

After these it was easy to find the official info: https://support.microsoft.com/en-us/kb/2547752
It is known problem since 2011 and there is a fix for it.
But why wasnt it distributed via Windows Update since then?

assemblyBinding not working in web.config?

Posted on by cly

Check Your config’s configuration tag! Has it any namespaces? e.g.:

<configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0">
   <runtime>
      <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
         <dependentAssembly>
            <assemblyIdentity name="SomeAssembly" publicKeyToken="..." />
            <bindingRedirect oldVersion="1.0.0.0" newVersion="2.0.0.0" />
         </dependentAssembly>
         ...

Remove namespace!

<configuration>
...

Voilá, it starts working!

Credits to this poster.

Drupal SSO: An unsupported mechanism was requested…

Posted on by cly

Here is a step that may help You to debug the error above.

Today I was setting up SSO on a Drupal page against MS AD. Something went wrong and I found the following message in site’s error_log:

gss_accept_sec_context() failed: An unsupported mechanism was requested (, Unknown error)

Let’s modify a little bit apache’s config, and add this to appropriate place (global or vhost level):

 LogLevel debug

Restart apache and check the log again:

kerb_authenticate_user entered with user (NULL) and auth_type Kerberos
Acquiring creds for HTTP/intranet.kesz.hu@KESZ.HU
Verifying client data using KRB5 GSS-API
Client didn't delegate us their credential
Warning: received token seems to be NTLM, which isn't supported by the Kerberos module. Check your IE configuration.
GSS-API major_status:00010000, minor_status:00000000
gss_accept_sec_context() failed: An unsupported mechanism was requested (, Unknown error)

So the real problem was: Warning: received token seems to be NTLM, which isn’t supported by the Kerberos module. That is much more informative than the unknown error we had before!

Dont forget to set back LogLevel after You finished because the log file fast becomes really large…

hpacucli error: no controllers detected.

Posted on by cly

I would like to check my P400 controller inside a HP DL180 G5 ProLiant server which was running x64 Linux with 2.6.31.6 kernel. HP has a utility named hpacucli designed for this kind of task so I was looking for appropriate download link. After found some versions (I newer understood the logic behind HP’s software version numbering) and downloaded them I realized that neither of them was seeing my P400 controller:

root@xerxes:~/opt/compaq/hpacucli/bld# ./.hpacucli ctrl all show

Error: No controllers detected.

The Internet is full with solutions to this problem:
– Use uname26 utility to hide Your 3.x kernel! But I have 2.6…
– modprobe sg before hpacucli! Sg was compiled into kernel already…
– etc…

After some hours of trials I was strace-ing the hpacucli command and found that it tries to open it’s libcpqimgr which was placed in the same directory but not in LD_LIBRARY_PATH, so it didnt found it. So “No controllers detected” actually means “Hey guy, I didnt find my right hand which I can use for detecting controllers!”. Nice.

Little modification to command line:

root@xerxes:~/opt/compaq/hpacucli/bld# LD_LIBRARY_PATH=. ./.hpacucli ctrl all show

Smart Array P400 in Slot 6                (sn: PAFGL0M9VWK002)

I understand that if I installed the package and used the appropriate script provided by HP I never met this situation. So this is an unexpected thing. But maybe others run into same so remember: strace is (one of) Your best (non human) friends!

CLR20r3 FileLoadException and Why Keep Settings from .config?

Posted on by cly

Today one of my colleagues tried to start a newer version of one of or .Net tools on her Win7 computer which was just copied from deployment share.

The app didn’t started, only Windows Error Reporting was doing something on the systray. In the Eventlog there was an error 22 with CLR20r3 and mentioning a FileLoadException. P4’s value: PresentationFramework. Short check about installed frameworks, etc.: everything seemed to be fine. Nothing useful was found in generated WER file either.

The tool was running well on other’s machine. What happened with her’s?

In the app’s .config file there were custom app settings in the appSettings section that’s why we keeped the original file from previous installation. The problem was that in .config there was an assemblyBinding section with a bindingRedirect too:

<configuration>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="AnAssembly" publicKeyToken="123123123123" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-1.0.33334.0" newVersion="1.0.33334.0" />
      </dependentAssembly>
     ...

The new code had a newer version of the AnAssembly which wasnt used because of the bindingRedirect above! The new .config had the updated version numbers, but we overwrite it with the previous version of file because we would like to keep the correct appSettings values. It is very handy to use the appSettings section in the .config but it is a bad idea because of framework configuration is keeped in the same place. Keeping it separately seems better idea.

PS.: What about PresentationFramework in the P4 value? Completely missleading info…

Jenkins: Publish Over CIFS plugin

Posted on by cly

If You run jenkins on windows machine I may save You some hours.

I wanted to copy some files from my job’s workspace to a network share which needed authentication. So XCOPY wasn’t enough, I looked for some other solution. The Publish Over CIFS plugin can handle this situation, so I installed and configured it and added a new “Send build artifact to windows share” post build step to my job.

After a quick build delay I found these lines at the end of the build’s console output:

CIFS: Connecting from host [atlas]
CIFS: Connecting with configuration [fileserver DEPLOY share] ...
CIFS: Removing WINS from name resolution
CIFS: Setting response timeout [30 000]
CIFS: Setting socket timeout [35 000]
CIFS: cleaning [smb://fileserver.mecset.local/DEPLOY/ArdinTemplatingRedmineConnector/]
CIFS: Disconnecting configuration [fileserver DEPLOY share] ...
CIFS: Transferred 0 file(s)

0 files transferred? I naturally have some result files, so I checked paths, etc. No errors but no files copied.

After a short 2 hours of trial-and-errors I realized: despite the hosting windows isn’t the plugin IS CASE SENSITIVE! Grrrrr…

My source files were set to: 

ArdinTemplatingRedmineConnector/bin/debug/**

After changed to:

ArdinTemplatingRedmineConnector/bin/Debug/**

everything worked fine.

Nothing was written on plugins wiki pages about this so if some source engine bringed You here I hope it helps.

LINQ to Object: Skip() performance

Posted on by cly

Assume You have a List of 5000000 items. You want to do some paging so You need e.g. 100 items from offset 300000. Check these two implementations:

        public List<T> GetItems1<T>(List<T> source, int offset, int count)
        {
            List<T> ret = new List<T>();

            for (int i = offset; i < offset + count; i++)
            {
                ret.Add(source[i]);
            }

            return ret;
        }

        public List<T> GetItems2<T>(List<T> source, int offset, int count)
        {
            List<T> ret = source.Skip(offset).Take(count).ToList();

            return ret;
        }

What do You think, which performs better? You may say the second one of course. The first one indexes the source list and calls Add() method count times. The second simply enumerates once till offset then returns count items as a new List with the possibility of internal item addition optimalization. At least that were what I think.

But I was wrong!

The second implementation always slower. The magnitude depends on the offset value but it is always slower!

offset GetItems1 GetItems2
0 43 65
10000 59 729
100000 44 5162
1000000 42 52057
3000000 44 147608

The reason is inside the implemetation details of List and IEnumerable.Skip(). The first one knows where to find the nth item, the second one should enumerate to it. The conclusion as one of my colleagues pointed out: use as specialized tools as You can.

The code which I used for result above:

    [TestClass]
    public class Test
    {
        private int cycles = 100;
        private int offset = 0;
        private int count = 100;

        [TestMethod]
        public void perftest1()
        {
            var l = GetTestData();

            var sw = new Stopwatch();

            double r = 0;
            for (int i = 0; i < cycles; i++)
            {
                sw.Reset();
                sw.Start();
                var result = GetItems1(l, offset, count);
                sw.Stop();
                r += sw.ElapsedTicks;
            }

            Assert.Fail((r / cycles).ToString());
        }


        [TestMethod]
        public void perftest2()
        {
            var l = GetTestData();

            var sw = new Stopwatch();

            double r = 0;
            for (int i = 0; i < cycles; i++)
            {
                sw.Reset();
                sw.Start();
                var result = GetItems2(l, offset, count);
                sw.Stop();
                r += sw.ElapsedTicks;
            }

            Assert.Fail((r / cycles).ToString());
        }


        public List<T> GetItems1<T>(List<T> source, int offset, int count)
        {
            ...
        }


        public List<T> GetItems2<T>(List<T> source, int offset, int count)
        {
            ...
        }

        private List<int> GetTestData()
        {
            List<int> ret = new List<int>();

            for (int i = 0; i < 5000000; i++)
            {
                ret.Add(i);
            }

            return ret;
        }
    }

Redmine, awesome_nested_set, Issue.rebuild!, lock_version and ActiveRecord::StaleObjectError

Posted on by cly

Today I got a task to restructure about 400 issues in our Redmine instance. I should create a hierarchy and reparent existing issues under new ones. All the issues have a lot of related ones. But when I tried to modify parent issue field I got “Parent task is invalid” message after saving. I found pages about this problem and the only solution: remove relations, reparent the issue and recreate relations… 400 issues with a lot of relations… No.

I was updating the database instead: set the issues.parent_id to the appropriate new value. Naturally after that two things went wrong: some aggregated values e.g. estimated_hours and the hierarchy view, because of awesome_nested_set gem was used which stores hierarchy speedup values in rgt and lft fields of that table. First of all I fired out these fields in database (11840 was my main root issue):

UPDATE issues 
SET 
  rgt=null, 
  lft=null 
WHERE parent_id=11840

Than the following command needs to run in redmine root dir:

RAILS_ENV=production ruby script/rails runner Issue.rebuild!

After a long run, error occured:

ActiveRecord::StaleObjectError: ActiveRecord::StaleObjectError
from /var/lib/gems/1.8/gems/activerecord-3.2.19/lib/active_record/locking/optimistic.rb:90:in `update'
from /var/lib/gems/1.8/gems/activerecord-3.2.19/lib/active_record/attribute_methods/dirty.rb:74:in `update'
from /var/lib/gems/1.8/gems/activerecord-3.2.19/lib/active_record/timestamp.rb:71:in `update'
from /var/lib/gems/1.8/gems/activerecord-3.2.19/lib/active_record/callbacks.rb:272:in `update'
from /var/lib/gems/1.8/gems/activesupport-3.2.19/lib/active_support/callbacks.rb:403:in `_run__1446014408__update__4__callbacks'
from /var/lib/gems/1.8/gems/activesupport-3.2.19/lib/active_support/callbacks.rb:405:in `send'
from /var/lib/gems/1.8/gems/activesupport-3.2.19/lib/active_support/callbacks.rb:405:in `__run_callback'
from /var/lib/gems/1.8/gems/activesupport-3.2.19/lib/active_support/callbacks.rb:385:in `_run_update_callbacks'
from /var/lib/gems/1.8/gems/activesupport-3.2.19/lib/active_support/callbacks.rb:81:in `send'
from /var/lib/gems/1.8/gems/activesupport-3.2.19/lib/active_support/callbacks.rb:81:in `run_callbacks'
from /var/lib/gems/1.8/gems/activerecord-3.2.19/lib/active_record/callbacks.rb:272:in `update'
from /var/lib/gems/1.8/gems/activerecord-3.2.19/lib/active_record/persistence.rb:348:in `create_or_update'
from /var/lib/gems/1.8/gems/activerecord-3.2.19/lib/active_record/callbacks.rb:264:in `create_or_update'
from /var/lib/gems/1.8/gems/activesupport-3.2.19/lib/active_support/callbacks.rb:590:in `_run__1446014408__save__4__callbacks'
from /var/lib/gems/1.8/gems/activesupport-3.2.19/lib/active_support/callbacks.rb:405:in `send'
from /var/lib/gems/1.8/gems/activesupport-3.2.19/lib/active_support/callbacks.rb:405:in `__run_callback'
... 18 levels...
from /var/lib/gems/1.8/gems/activerecord-3.2.19/lib/active_record/relation/delegation.rb:6:in `__send__'
from /var/lib/gems/1.8/gems/activerecord-3.2.19/lib/active_record/relation/delegation.rb:6:in `each'
from /var/lib/gems/1.8/gems/awesome_nested_set-2.1.6/lib/awesome_nested_set/awesome_nested_set.rb:203:in `rebuild!'
from /var/lib/gems/1.8/gems/awesome_nested_set-2.1.6/lib/awesome_nested_set/awesome_nested_set.rb:213:in `call'
from /var/lib/gems/1.8/gems/awesome_nested_set-2.1.6/lib/awesome_nested_set/awesome_nested_set.rb:213:in `rebuild!'
from /var/lib/gems/1.8/gems/activerecord-3.2.19/lib/active_record/relation/delegation.rb:6:in `each'
from /var/lib/gems/1.8/gems/activerecord-3.2.19/lib/active_record/relation/delegation.rb:6:in `__send__'
from /var/lib/gems/1.8/gems/activerecord-3.2.19/lib/active_record/relation/delegation.rb:6:in `each'
from /var/lib/gems/1.8/gems/awesome_nested_set-2.1.6/lib/awesome_nested_set/awesome_nested_set.rb:210:in `rebuild!'
from /var/lib/gems/1.8/gems/activerecord-3.2.19/lib/active_record/scoping/default.rb:41:in `unscoped'
from /var/lib/gems/1.8/gems/activerecord-3.2.19/lib/active_record/relation.rb:241:in `scoping'
from /var/lib/gems/1.8/gems/activerecord-3.2.19/lib/active_record/scoping.rb:98:in `with_scope'
from /var/lib/gems/1.8/gems/activerecord-3.2.19/lib/active_record/relation.rb:241:in `scoping'
from /var/lib/gems/1.8/gems/activerecord-3.2.19/lib/active_record/scoping/default.rb:41:in `unscoped'
from /var/lib/gems/1.8/gems/awesome_nested_set-2.1.6/lib/awesome_nested_set/awesome_nested_set.rb:185:in `rebuild!'

After some googling I modified my command:

RAILS_ENV=production ruby script/rails console
irb(main):003:0> Issue.rebuild!

Same error, but instead of long nothinghappens block a lot of SQL statements were scrolling on my screen which indicate what is happening. Here are the interesting last ones:

   ...
   (0.2ms)  UPDATE `issues` SET `lock_version` = 53, `estimated_hours` = NULL, `updated_on` = '2014-11-25 12:29:00' WHERE (`issues`.`id` = 12751 AND `issues`.`lock_version` = 52)
   ...
   (0.1ms)  UPDATE `issues` SET `lock_version` = 53, `lft` = 388, `updated_on` = '2014-11-25 12:29:02', `rgt` = 419 WHERE (`issues`.`id` = 12751 AND `issues`.`lock_version` = 52)
   (0.1ms)  ROLLBACK

So it seems that the ActiveRecord contexts used by Redmine and nested set’s rebuilder differ: Redmine collects info about aggregated values and updates the record and the other one wants to update the hierarchy fields. Optimistic concurrency fails here.

My solution: stop Redmine and run this command in ruby console before Issure.rebuild!:

irb(main):003:0> ActiveRecord::Base.lock_optimistically = false

This will turn off concurrency locking in Your process so script will run. It seems the fields updated are not overlapped so running without locking is not a problem.

NuGet silently overwrites some files

Posted on by cly

On package update NuGet silently overwrites some files. Consider You have something like this in Your nuspec file:

    <file src="MyPackage\App.xaml.cs.pp" target="content\App.xaml.cs.pp" />
    <file src="MyPackage\App.xaml.pp" target="content\App.xaml.pp" />

Consider the user changed App.xaml.cs but didnt changed App.xaml. In this case when user updates Your package the App.xaml.cs file will be silently overwritten!

After a short search session on the net I found a same problem without any solutions. So here is mine install.ps1 with a workaround:

param($installPath, $toolsPath, $package, $project)
$appXamlFileName = $item.Properties.Item("FullPath").Value
Add-Content $appXamlFileName "<!-- this comment added by nuget package's install script to modify this file to workaround bug which overwrites App.xaml.cs file on next package update if this one isnt modified -->"

On update NuGet will detect that App.xaml changed and will skip it AND App.xaml.cs file too!

Howto debug NuGet package’s install.ps1

Posted on by cly

While searching for solution around install.ps1 I quickly realised that the edit file -> create package -> publish -> update target cycle isnt very handly. There are step-by-step instructions on the net how to debug install.ps1, but when I tried to use them I run into new problems about incompatibility between my packages and nuget powershell cmdlets.

So I used a poor mans solution instead:

  1. Add some dummy content file to You package.
  2. Install Your package.
  3. Edit that dummy file (each next package install cycle will ask You about overwriting and that is what we need!)
  4. Open Package Manager Console (PMC) in VS
  5. Execute “Set-PsDebug -trace 2”. It helps You later.
  6. Open the install.ps1 in some editor (I used PowerShell ISE) from target project’s packages directory.
  7. In PMC run “update-package _yourpackagename_ -reinstall”. The installation will stop because file overwriting.
  8. In the PS editor edit and save install.ps1, but dont close it.
  9. Back to PMC and answer the overwriting question (with ‘L’ or ‘N’ to keep the modified file).
  10. See the results.
  11. Go to 7.

Not to smart, didnt uses tools and libraries but it works in acceptable cycle time.