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Add support for security invoker views.

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A security invoker view checks permissions for accessing its
underlying base relations using the privileges of the user of the
view, rather than the privileges of the view owner. Additionally, if
any of the base relations are tables with RLS enabled, the policies of
the user of the view are applied, rather than those of the view owner.

This allows views to be defined without giving away additional
privileges on the underlying base relations, and matches a similar
feature available in other database systems.

It also allows views to operate more naturally with RLS, without
affecting the assignments of policies to users.

Christoph Heiss, with some additional hacking by me. Reviewed by
Laurenz Albe and Wolfgang Walther.

Discussion: https://postgr.es/m/b66dd6d6-ad3e-c6f2-8b90-47be773da240%40cybertec.at
This commit is contained in:
Dean Rasheed
2022-03-22 10:28:10 +00:00
parent f5576a21b0
commit 7faa5fc84b
20 changed files with 1240 additions and 76 deletions
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11
src/include/utils/rel.h
View File

@@ -398,6 +398,7 @@ typedef struct ViewOptions
{
int32 vl_len_; /* varlena header (do not touch directly!) */
bool security_barrier;
bool security_invoker;
ViewOptCheckOption check_option;
} ViewOptions;
@@ -411,6 +412,16 @@ typedef struct ViewOptions
(relation)->rd_options ? \
((ViewOptions *) (relation)->rd_options)->security_barrier : false)
/*
* RelationHasSecurityInvoker
* Returns true if the relation has the security_invoker property set.
* Note multiple eval of argument!
*/
#define RelationHasSecurityInvoker(relation) \
(AssertMacro(relation->rd_rel->relkind == RELKIND_VIEW), \
(relation)->rd_options ? \
((ViewOptions *) (relation)->rd_options)->security_invoker : false)
/*
* RelationHasCheckOption
* Returns true if the relation is a view defined with either the local