{"id":2011,"date":"2014-02-13T11:00:42","date_gmt":"2014-02-13T16:00:42","guid":{"rendered":"http:\/\/sqlity.net\/en\/?p=2011"},"modified":"2014-02-09T17:41:00","modified_gmt":"2014-02-09T22:41:00","slug":"deny-vs-revoke-4","status":"publish","type":"post","link":"https:\/\/sqlity.net\/en\/2011\/deny-vs-revoke-4\/","title":{"rendered":"DENY vs. REVOKE – Part 4 – Hierarchies of Privileges"},"content":{"rendered":"
\n

Introduction<\/h3>\n

\nOver the last few days we have looked at the difference between DENY<\/span> and REVOKE<\/span>, particularly in the context of hierarchies. So far we looked at hierarchies of security principals<\/a> and hierarchies of securables<\/a>. There is one more hierarchy that I would like to cover: The hierarchy of permissions.\n<\/p>\n

Permission Hierarchy Example<\/h3>\n

\nIf you look up a specific privilege in Books Online, for example under Object Permissions<\/a>, you will see next to each specific privilege another privilege that implies the former. Most object privileges are only implied by the CONTROL object privilege, but there are others.\n<\/p>\n

\nAs with the other hierarchies that we looked at, this hierarchy can be used to fine tune your permission management. Let's look at a simple example. First we need to create a user and a table:\n<\/p>\n

\n[sql]\nCREATE LOGIN TestLogin1 WITH PASSWORD='********', CHECK_POLICY = OFF;
\nCREATE USER TestUser1 FOR LOGIN TestLogin1;<\/p>\n

CREATE TABLE dbo.tst(id INT);
\nINSERT INTO dbo.tst VALUES(42);
\n[\/sql]\n<\/p><\/div>\n

\nNow we GRANT CONTROL<\/span> on that table to our user:\n<\/p>\n

\n\"CONTROL<\/a>\n<\/p>\n

\nAs you can see, the CONTROL<\/span> privilege implies the SELECT<\/span> privilege.\n<\/p>\n

\nFollowing the same pattern that we have used with the other two hierarchies, let's try to REVOKE SELECT<\/span> on that table form TestUser1<\/span>:\n<\/p>\n

\n\"REVOKE<\/a>\n<\/p>\n

\nWe had never granted SELECT<\/span> to TestUser1<\/span> so we expected the REVOKE<\/span> to not have any effect on the existing access permissions. The above confirms that we assumed correctly.
\n<\/P.\n\n\n

\nNow let's see if we can use DENY<\/span> to remove the SELECT<\/span> privilege:\n<\/p>\n

\n\"DENY<\/a>\n<\/p>\n

\nThat worked; the DENY SELECT<\/span> successfully prevented read access on the table in spite of the previously granted CONTROL<\/span> privilege.\n<\/p>\n

\nAs with all other hierarchies we looked at before, a DENY<\/span> anywhere in the hierarchy overrides any GRANT<\/span> on a different level.\n<\/p>\n

\nJust to clarify however, the DENY SELECT<\/span> does only affect attempts to read data. Other privileges that are implied by CONTROL<\/span> are not affected. So, TestUser1<\/span> is for example still able to execute an INSERT<\/span> statement against that table:\n <\/p>\n

\n\"DENY<\/a>\n<\/p>\n

\nWhile a DENY<\/span> always overrides a GRANT<\/span> if executed on different levels of a security hierarchy, the DENY<\/span> will only affect operations that require either the specific privilege that was denied or any privilege that is implied by it.\n<\/p>\n

Summary<\/h3>\n

\nPermission level hierarchies build another security related hierarchy. As with other hierarchies we looked at, a DENY<\/span> on any level of this type of hierarchy will override any number of grants on other levels.\n<\/p>\n

DENY vs. REVOKE Series<\/h3>\n

\nThis post is part of a five-part series comparing the DENY<\/span> and the REVOKE<\/span> statements.
\nBelow is a list of links to the posts that are already available.\n<\/p>\n

\n
\n

DENY vs. REVOKE – Part 1 – Are they just synonyms?<\/a><\/h2>\n
<\/div>\n<\/div>\n
\n

DENY vs. REVOKE – Part 2 – Hierarchies of Principals<\/a><\/h2>\n
<\/div>\n<\/div>\n
\n

DENY vs. REVOKE – Part 3 – Hierarchies of Securables<\/a><\/h2>\n
<\/div>\n<\/div>\n
\n

DENY vs. REVOKE – Part 4 – Hierarchies of Privileges<\/a><\/h2>\n
<\/div>\n<\/div>\n
\n

DENY vs. REVOKE – Part 5 – Durability<\/a><\/h2>\n
<\/div>\n<\/div>\n<\/div>\n\n<\/div>\n","protected":false},"excerpt":{"rendered":"

This fourth part of the short series about DENY vs. REVOKE shows that a DENY on the hierarchy of privileges can be used to fine tune permission management. Read on to get all the details.<\/p>\n

[more…]<\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[104,5,34,27],"tags":[103,275,88,50,98,38,58,15],"class_list":["post-2011","post","type-post","status-publish","format-standard","hentry","category-deny-vs-revoke","category-general","category-security","category-series","tag-deny","tag-deny-vs-revoke","tag-grant","tag-permission","tag-revoke","tag-security-2","tag-security-management","tag-sql-server"],"acf":[],"yoast_head":"\nDENY vs. REVOKE - 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