Function of Login Created from Asymmetric Key in External Access Assemblies?

SQLServerCentral is supported by Red Gate Software Ltd.

Popular Topics

Home

Members

Calendar

Who's On

Home » SQL Server 2005 » CLR Integration and Programming. » Function of Login Created from Asymmetric Key...

Function of Login Created from Asymmetric Key in External Access Assemblies?

Rate Topic

Display Mode

Topic Options

Author

Message

Marios Philippopoulos

Posted Wednesday, May 21, 2008 1:02 PM

SSCommitted

Group: General Forum Members
Last Login: Tuesday, May 14, 2013 7:10 AM
Points: 1,824, Visits: 3,477

One of the ways of creating an EXTERNAL_ACCESS assembly is to:

(1) CREATE ASYMMETRIC KEY from the assembly dll;
(2) CREATE LOGIN FROM the ASYMMETRIC KEY;
(3) Grant EXTERNAL ACCESS ASSEMBLY permission to the LOGIN created in previous step;
(4) CREATE ASSEMBLY ... WITH permission_set = EXTERNAL_ACCESS;

I understand that an increased level of trust is required when external resources are accessed, hence the asymmetric key.

However, I don't see what the purpose of the LOGIN is.

In BOL (http://msdn.microsoft.com/en-us/library/ms189751.aspx) I read:
Logins created from certificates or asymmetric keys are used only for code signing. They cannot be used to connect to SQL Server.

Can someone please explain what that means?

What does this LOGIN actually do?!

__________________________________________________________________________________

Turbocharge Your Database Maintenance With Service Broker: Part 1
Real-Time Tracking of Tempdb Utilization Through Reporting Services
Monitoring Database Blocking Through SCOM 2007 Custom Rules and Alerts
Preparing for the Unthinkable - a Disaster/Recovery Implementation

Post #504767

RBarryYoung

Posted Wednesday, May 21, 2008 7:18 PM

SSCrazy Eights

Group: General Forum Members
Last Login: Saturday, May 04, 2013 11:13 AM
Points: 9,855, Visits: 9,374

I believe that you have to make the login the Owner (or executor?) of the Assembly

-- RBarryYoung, (302)375-0451 blog: MovingSQL.com, Twitter: @RBarryYoung
Proactive Performance Solutions, Inc. "Performance is our middle name."

Post #504935

Marios Philippopoulos

Posted Thursday, May 22, 2008 7:42 AM

SSCommitted

Group: General Forum Members
Last Login: Tuesday, May 14, 2013 7:10 AM
Points: 1,824, Visits: 3,477

rbarryyoung (5/21/2008)

I believe that you have to make the login the Owner (or executor?) of the Assembly

I did not have to make it owner of the assembly. But perhaps, as you say, it is the executor...

I just don't understand the BOL speak (see opening post).

__________________________________________________________________________________

Turbocharge Your Database Maintenance With Service Broker: Part 1
Real-Time Tracking of Tempdb Utilization Through Reporting Services
Monitoring Database Blocking Through SCOM 2007 Custom Rules and Alerts
Preparing for the Unthinkable - a Disaster/Recovery Implementation

Post #505180

RBarryYoung

Posted Thursday, May 22, 2008 11:39 AM

SSCrazy Eights

Group: General Forum Members
Last Login: Saturday, May 04, 2013 11:13 AM
Points: 9,855, Visits: 9,374

I agree, it's confusing. I am not sure what the answer is either.

-- RBarryYoung, (302)375-0451 blog: MovingSQL.com, Twitter: @RBarryYoung
Proactive Performance Solutions, Inc. "Performance is our middle name."

Post #505358

Marios Philippopoulos

Posted Thursday, May 22, 2008 11:43 AM

SSCommitted

Group: General Forum Members
Last Login: Tuesday, May 14, 2013 7:10 AM
Points: 1,824, Visits: 3,477

rbarryyoung (5/22/2008)

I agree, it's confusing. I am not sure what the answer is either.

No problem, thank you for responding.

I will be making the case for SQLCLR in an upcoming meeting, and I'm trying to fill up holes in my understanding (of which there are many! w00t

)

__________________________________________________________________________________

Turbocharge Your Database Maintenance With Service Broker: Part 1
Real-Time Tracking of Tempdb Utilization Through Reporting Services
Monitoring Database Blocking Through SCOM 2007 Custom Rules and Alerts
Preparing for the Unthinkable - a Disaster/Recovery Implementation

Post #505362

RBarryYoung

Posted Thursday, May 22, 2008 3:43 PM

SSCrazy Eights

Group: General Forum Members
Last Login: Saturday, May 04, 2013 11:13 AM
Points: 9,855, Visits: 9,374

As it happens, I was just working with a customer today on CLR assemblies, and it seems that the key/login is supposed to be used to "Sign" the assembly when it is built. The list that you have looks like it combines two different things: 1) creating an assembly that has been singed with a certificate or strong name(assymetric key), whose corresponding login has the EXTERNAL_ACCESS permission, as opposed to 2) Giving TRUSTWORTHY to the database and EXTERNAL_ACCESS permission to the database owner.

here is a microsoft link that explains: http://msdn.microsoft.com/en-us/library/ms345106.aspx

-- RBarryYoung, (302)375-0451 blog: MovingSQL.com, Twitter: @RBarryYoung
Proactive Performance Solutions, Inc. "Performance is our middle name."

Post #505521

« Prev Topic | Next Topic »

Permissions