{"id":2094,"date":"2014-02-20T11:00:33","date_gmt":"2014-02-20T16:00:33","guid":{"rendered":"http:\/\/sqlity.net\/en\/?p=2094"},"modified":"2014-11-13T13:15:39","modified_gmt":"2014-11-13T18:15:39","slug":"column-grant-overrides-table-deny","status":"publish","type":"post","link":"https:\/\/sqlity.net\/en\/2094\/column-grant-overrides-table-deny\/","title":{"rendered":"Security Pitfalls – Column Level GRANT overrides Table Level DENY"},"content":{"rendered":"
\n

Introduction<\/h3>\n

\nA few days ago we talked about Hierarchies of Securables<\/a>. There we saw that a DENY<\/span> on one level always wins over a GRANT<\/span> on another level. Well, as they say, there is no rule without exception.\n<\/p>\n

The Special Column Level Grant<\/h3>\n

\nAs we have seen before, for example in my post about revoking of column permissions<\/a>, column permissions are at times a little odd. In this post I would like to show you another one of those oddities. For that I first need a principal and a securable:\n<\/p>\n

\n[sql]\nCREATE LOGIN TestLogin1 WITH PASSWORD='********', CHECK_POLICY = OFF;
\nCREATE USER TestUser1 FOR LOGIN TestLogin1;
\nGO
\nCREATE SCHEMA TestSchema1;
\nGO
\nCREATE TABLE TestSchema1.tst1(id INT, col1 INT);
\nINSERT INTO TestSchema1.tst1 VALUES(42, 1);
\n[\/sql]\n<\/div>\n

\nBefore we get started however, let's recap what the expected behavior is. When a privilege is granted at the table level but denied at the schema level we expect, because we know that a DENY<\/span> always wins, that access to the table will be denied. Let's confirm:\n<\/p>\n

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

\nAs expected, TestUser1<\/span> cannot SELECT<\/span> from the table. Only after the DENY<\/span> has been explicitly revoked can the table be accessed:\n<\/p>\n

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

\nNow let's see what happens if we DENY<\/span> access to the table, but GRANT<\/span> it to a column:\n<\/p>\n

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

\nThe access attempt is successful. Even though access was denied at a different hierarchy level, and even though a DENY<\/span> should always trump a GRANT<\/span>, TestUser1<\/span> was able to SELECT<\/span> from the table.\n<\/p>\n

\nThe documentation says about this: \"A table-level DENY does not take precedence over a column-level GRANT. This inconsistency in the permissions hierarchy has been preserved for backward compatibility.<\/a>\"\n<\/p>\n

\nWhile in other cases such an inconsistency is usually marked deprecated, it seems Microsoft is reluctant to changing this behavior. So we have to live with the fact that a table level DENY<\/span> cannot be used to override a column level GRANT<\/span>.\n<\/p>\n

\nHowever, a table level DENY<\/span> and a column level GRANT<\/span> is the only coupling that fails to obey the rules. For example a schema level DENY<\/span> is stronger that a column level GRANT<\/span>:\n<\/p>\n

\n\"However,<\/a>\n<\/p>\n

Summary<\/h3>\n

\nFor reasons of backward compatibility, in SQL Server a column level GRANT<\/span> is stronger than a table level DENY<\/span>. This is a unique exception to the rule that a deny on any level of the hierarchy of securables always overrides a GRANT<\/span> on another level.\n<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

While a DENY on one level of a security hierarchy in SQL Server always overrides a GRANT on a different level, there is one important exception. Read on to learn more about this exception and how it affects your security management.<\/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":[5,34,99],"tags":[103,88,50,38,58,15],"class_list":["post-2094","post","type-post","status-publish","format-standard","hentry","category-general","category-security","category-security-pitfalls","tag-deny","tag-grant","tag-permission","tag-security-2","tag-security-management","tag-sql-server"],"acf":[],"yoast_head":"\nSecurity Pitfalls - 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