Bug 3897 - The X509Certificate2Collection.Find method doesn't work correctly with FindBySubjectName
Summary: The X509Certificate2Collection.Find method doesn't work correctly with FindBy...
Alias: None
Product: Class Libraries
Classification: Mono
Component: System ()
Version: master
Hardware: PC Linux
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2012-03-14 12:08 UTC by David Ferguson
Modified: 2012-03-23 11:53 UTC (History)
2 users (show)

Is this bug a regression?: ---
Last known good build:

Unit test that passes on Windows and with the proposed fix. Fails on runtime without fix. (2.65 KB, text/plain)
2012-03-15 12:36 UTC, David Ferguson

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Description David Ferguson 2012-03-14 12:08:52 UTC
According to the MS documentation, FindBySubjectName looks in the subject to see if it contains the passed in string:


Suppose a X509Certificate2 has a subject name similar to:


In the current code, the .Find is executing the following code when passed the FindBySubjectName enumeration (with x being a X509Certificate2 object):

string sname = x.GetNameInfo (X509NameType.SimpleName, false);
value_match = (sname.IndexOf (str, StringComparison.InvariantCultureIgnoreCase) >= 0);

When testing GetNameInfo (X509Type.SimpleName, false) on Windows with the above subject, "MY_CN" is returned.  This is also the case on Mono.  However, if you execute the find method and pass in "MY_CERTIFICATE", Mono will not match because it uses the simple name returned from the method above.  .NET on Windows will match it.

I suggest a fix of the following code:

string sname = x.Subject;
value_match = (sname.IndexOf (str, StringComparison.InvariantCultureIgnoreCase) >= 0);
Comment 1 Sebastien Pouliot 2012-03-14 16:16:01 UTC
Could you please add a test case so:

* I can test it under Windows to confirm;

* I can add it to the unit test suite so it does not regress in the future

That will make it much quicker for me (and you ;-). Thanks
Comment 2 David Ferguson 2012-03-15 12:36:19 UTC
Created attachment 1521 [details]
Unit test that passes on Windows and with the proposed fix.  Fails on runtime without fix.
Comment 3 Sebastien Pouliot 2012-03-23 11:02:31 UTC
Thanks for the unit test. It will be added into our test suite.

Changing `GetNameInfo (X509NameType.SimpleName, false);` to `Subject` actually breaks another unit test. So the correct fix is likely a bit more complex.
Comment 4 Sebastien Pouliot 2012-03-23 11:53:44 UTC
It will now process every part of the subject name - but without the oid acronyms. Unit test updated to show this.

fixed in master: f805fe66edba3cc35e013c656f4c17ba7bf72481
mono-2-10: 28f09f89a236a74a7de1f4c90ac0a24a953014d8
thanks for the tests!