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Commit fd49612

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Clean up some mess in row-security patches.
Fix unsafe coding around PG_TRY in RelationBuildRowSecurity: can't change a variable inside PG_TRY and then use it in PG_CATCH without marking it "volatile". In this case though it seems saner to avoid that by doing a single assignment before entering the TRY block. I started out just intending to fix that, but the more I looked at the row-security code the more distressed I got. This patch also fixes incorrect construction of the RowSecurityPolicy cache entries (there was not sufficient care taken to copy pass-by-ref data into the cache memory context) and a whole bunch of sloppiness around the definition and use of pg_policy.polcmd. You can't use nulls in that column because initdb will mark it NOT NULL --- and I see no particular reason why a null entry would be a good idea anyway, so changing initdb's behavior is not the right answer. The internal value of '\0' wouldn't be suitable in a "char" column either, so after a bit of thought I settled on using '*' to represent ALL. Chasing those changes down also revealed that somebody wasn't paying attention to what the underlying values of ACL_UPDATE_CHR etc really were, and there was a great deal of lackadaiscalness in the catalogs.sgml documentation for pg_policy and pg_policies too. This doesn't pretend to be a complete code review for the row-security stuff, it just fixes the things that were in my face while dealing with the bugs in RelationBuildRowSecurity.
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11 files changed

+241
-236
lines changed

11 files changed

+241
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lines changed

‎doc/src/sgml/catalogs.sgml

+115-111
Original file line numberDiff line numberDiff line change
@@ -218,6 +218,11 @@
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<entry>template data for procedural languages</entry>
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</row>
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221+
<row>
222+
<entry><link linkend="catalog-pg-policy"><structname>pg_policy</structname></link></entry>
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<entry>row-security policies</entry>
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</row>
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<row>
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<entry><link linkend="catalog-pg-proc"><structname>pg_proc</structname></link></entry>
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<entry>functions and procedures</entry>
@@ -238,11 +243,6 @@
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<entry>replication slot information</entry>
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</row>
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<row>
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<entry><link linkend="catalog-pg-policy"><structname>pg_policy</structname></link></entry>
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<entry>table policies</entry>
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</row>
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<row>
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<entry><link linkend="catalog-pg-seclabel"><structname>pg_seclabel</structname></link></entry>
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<entry>security labels on database objects</entry>
@@ -1940,20 +1940,20 @@
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</row>
19411941

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<row>
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<entry><structfield>relrowsecurity</structfield></entry>
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<entry><structfield>relhassubclass</structfield></entry>
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<entry><type>bool</type></entry>
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<entry></entry>
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<entry>
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True if table has row level security enabled; see
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<link linkend="catalog-pg-policy"><structname>pg_policy</structname></link> catalog
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</entry>
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<entry>True if table has (or once had) any inheritance children</entry>
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</row>
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<row>
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<entry><structfield>relhassubclass</structfield></entry>
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<entry><structfield>relrowsecurity</structfield></entry>
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<entry><type>bool</type></entry>
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<entry></entry>
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<entry>True if table has (or once had) any inheritance children</entry>
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<entry>
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True if table has row-level security enabled; see
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<link linkend="catalog-pg-policy"><structname>pg_policy</structname></link> catalog
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</entry>
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</row>
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<row>
@@ -4711,6 +4711,98 @@
47114711

47124712
</sect1>
47134713

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<sect1 id="catalog-pg-policy">
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<title><structname>pg_policy</structname></title>
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<indexterm zone="catalog-pg-policy">
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<primary>pg_policy</primary>
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</indexterm>
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<para>
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The catalog <structname>pg_policy</structname> stores row-level
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security policies for tables. A policy includes the kind of
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command that it applies to (possibly all commands), the roles that it
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applies to, the expression to be added as a security-barrier
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qualification to queries that include the table, and the expression
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to be added as a <literal>WITH CHECK</> option for queries that attempt to
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add new records to the table.
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</para>
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<table>
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<title><structname>pg_policy</structname> Columns</title>
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<tgroup cols="4">
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<thead>
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<row>
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<entry>Name</entry>
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<entry>Type</entry>
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<entry>References</entry>
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<entry>Description</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><structfield>polname</structfield></entry>
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<entry><type>name</type></entry>
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<entry></entry>
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<entry>The name of the policy</entry>
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</row>
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<row>
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<entry><structfield>polrelid</structfield></entry>
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<entry><type>oid</type></entry>
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<entry><literal><link linkend="catalog-pg-class"><structname>pg_class</structname></link>.oid</literal></entry>
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<entry>The table to which the policy applies</entry>
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</row>
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<row>
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<entry><structfield>polcmd</structfield></entry>
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<entry><type>char</type></entry>
4763+
<entry></entry>
4764+
<entry>The command type to which the policy is applied:
4765+
<literal>r</> for <command>SELECT</>,
4766+
<literal>a</> for <command>INSERT</>,
4767+
<literal>w</> for <command>UPDATE</>,
4768+
<literal>d</> for <command>DELETE</>,
4769+
or <literal>*</> for all</entry>
4770+
</row>
4771+
4772+
<row>
4773+
<entry><structfield>polroles</structfield></entry>
4774+
<entry><type>oid[]</type></entry>
4775+
<entry><literal><link linkend="catalog-pg-authid"><structname>pg_authid</structname></link>.oid</literal></entry>
4776+
<entry>The roles to which the policy is applied</entry>
4777+
</row>
4778+
4779+
<row>
4780+
<entry><structfield>polqual</structfield></entry>
4781+
<entry><type>pg_node_tree</type></entry>
4782+
<entry></entry>
4783+
<entry>The expression tree to be added to the security barrier qualifications for queries that use the table</entry>
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</row>
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4786+
<row>
4787+
<entry><structfield>polwithcheck</structfield></entry>
4788+
<entry><type>pg_node_tree</type></entry>
4789+
<entry></entry>
4790+
<entry>The expression tree to be added to the WITH CHECK qualifications for queries that attempt to add rows to the table</entry>
4791+
</row>
4792+
4793+
</tbody>
4794+
</tgroup>
4795+
</table>
4796+
4797+
<note>
4798+
<para>
4799+
Policies stored in <structname>pg_policy</> are applied only when
4800+
<structname>pg_class</>.<structfield>relrowsecurity</> is set for
4801+
their table.
4802+
</para>
4803+
</note>
4804+
4805+
</sect1>
47144806

47154807
<sect1 id="catalog-pg-proc">
47164808
<title><structname>pg_proc</structname></title>
@@ -5342,94 +5434,6 @@
53425434
</table>
53435435
</sect1>
53445436

5345-
<sect1 id="catalog-pg-policy">
5346-
<title><structname>pg_policy</structname></title>
5347-
5348-
<indexterm zone="catalog-pg-policy">
5349-
<primary>pg_policy</primary>
5350-
</indexterm>
5351-
5352-
<para>
5353-
The catalog <structname>pg_policy</structname> stores row-level
5354-
security policies for each table. A policy includes the kind of
5355-
command which it applies to (or all commands), the roles which it
5356-
applies to, the expression to be added as a security-barrier
5357-
qualification to queries which include the table and the expression
5358-
to be added as a with-check option for queries which attempt to add
5359-
new records to the table.
5360-
</para>
5361-
5362-
<table>
5363-
5364-
<title><structname>pg_policy</structname> Columns</title>
5365-
5366-
<tgroup cols="4">
5367-
<thead>
5368-
<row>
5369-
<entry>Name</entry>
5370-
<entry>Type</entry>
5371-
<entry>References</entry>
5372-
<entry>Description</entry>
5373-
</row>
5374-
</thead>
5375-
5376-
<tbody>
5377-
<row>
5378-
<entry><structfield>polname</structfield></entry>
5379-
<entry><type>name</type></entry>
5380-
<entry></entry>
5381-
<entry>The name of the policy</entry>
5382-
</row>
5383-
5384-
<row>
5385-
<entry><structfield>polrelid</structfield></entry>
5386-
<entry><type>oid</type></entry>
5387-
<entry><literal><link linkend="catalog-pg-class"><structname>pg_class</structname></link>.oid</literal></entry>
5388-
<entry>The table to which the policy belongs</entry>
5389-
</row>
5390-
5391-
<row>
5392-
<entry><structfield>polcmd</structfield></entry>
5393-
<entry><type>char</type></entry>
5394-
<entry></entry>
5395-
<entry>The command type to which the policy is applied.</entry>
5396-
</row>
5397-
5398-
<row>
5399-
<entry><structfield>polroles</structfield></entry>
5400-
<entry><type>char</type></entry>
5401-
<entry></entry>
5402-
<entry>The roles to which the policy is applied.</entry>
5403-
</row>
5404-
5405-
<row>
5406-
<entry><structfield>polqual</structfield></entry>
5407-
<entry><type>pg_node_tree</type></entry>
5408-
<entry></entry>
5409-
<entry>The expression tree to be added to the security barrier qualifications for queries which use the table.</entry>
5410-
</row>
5411-
5412-
<row>
5413-
<entry><structfield>polwithcheck</structfield></entry>
5414-
<entry><type>pg_node_tree</type></entry>
5415-
<entry></entry>
5416-
<entry>The expression tree to be added to the with check qualifications for queries which attempt to add rows to the table.</entry>
5417-
</row>
5418-
5419-
</tbody>
5420-
</tgroup>
5421-
</table>
5422-
5423-
<note>
5424-
<para>
5425-
<literal>pg_class.relrowsecurity</literal>
5426-
True if the table has row security enabled. Policies will not be applied
5427-
unless row security is enabled on the table.
5428-
</para>
5429-
</note>
5430-
5431-
</sect1>
5432-
54335437
<sect1 id="catalog-pg-seclabel">
54345438
<title><structname>pg_seclabel</structname></title>
54355439

@@ -8166,7 +8170,7 @@ SELECT * FROM pg_locks pl LEFT JOIN pg_prepared_xacts ppx
81668170

81678171
<para>
81688172
The view <structname>pg_policies</structname> provides access to
8169-
useful information about each policy in the database.
8173+
useful information about each row-level security policy in the database.
81708174
</para>
81718175

81728176
<table>
@@ -8197,34 +8201,34 @@ SELECT * FROM pg_locks pl LEFT JOIN pg_prepared_xacts ppx
81978201
<row>
81988202
<entry><structfield>policyname</structfield></entry>
81998203
<entry><type>name</type></entry>
8200-
<entry><literal><link linkend="catalog-pg-class"><structname>pg_class</structname></link>.relname</literal></entry>
8204+
<entry><literal><link linkend="catalog-pg-policy"><structname>pg_policy</structname></link>.polname</literal></entry>
82018205
<entry>Name of policy</entry>
82028206
</row>
82038207
<row>
8204-
<entry><structfield>cmd</structfield></entry>
8205-
<entry><type>text</type></entry>
8208+
<entry><structfield>roles</structfield></entry>
8209+
<entry><type>name[]</type></entry>
82068210
<entry></entry>
8207-
<entry>The command type to which the policy is applied.</entry>
8211+
<entry>The roles to which this policy applies</entry>
82088212
</row>
82098213
<row>
8210-
<entry><structfield>roles</structfield></entry>
8211-
<entry><type>name[]</type></entry>
8214+
<entry><structfield>cmd</structfield></entry>
8215+
<entry><type>text</type></entry>
82128216
<entry></entry>
8213-
<entry>The roles to which this policy applies.</entry>
8217+
<entry>The command type to which the policy is applied</entry>
82148218
</row>
82158219
<row>
82168220
<entry><structfield>qual</structfield></entry>
82178221
<entry><type>text</type></entry>
82188222
<entry></entry>
82198223
<entry>The expression added to the security barrier qualifications for
8220-
queries which this policy applies to.</entry>
8224+
queries that this policy applies to</entry>
82218225
</row>
82228226
<row>
82238227
<entry><structfield>with_check</structfield></entry>
82248228
<entry><type>text</type></entry>
82258229
<entry></entry>
8226-
<entry>The expression added to the with check qualifications for
8227-
queries which attempt to add rows to this table.</entry>
8230+
<entry>The expression added to the WITH CHECK qualifications for
8231+
queries that attempt to add rows to this table</entry>
82288232
</row>
82298233
</tbody>
82308234
</tgroup>

‎src/backend/catalog/system_views.sql

+6-7
Original file line numberDiff line numberDiff line change
@@ -79,13 +79,12 @@ CREATE VIEW pg_policies AS
7979
WHERE oid = ANY (pol.polroles) ORDER BY 1
8080
)
8181
END AS roles,
82-
CASE WHEN pol.polcmd IS NULL THEN 'ALL' ELSE
83-
CASE pol.polcmd
84-
WHEN 'r' THEN 'SELECT'
85-
WHEN 'a' THEN 'INSERT'
86-
WHEN 'u' THEN 'UPDATE'
87-
WHEN 'd' THEN 'DELETE'
88-
END
82+
CASE pol.polcmd
83+
WHEN 'r' THEN 'SELECT'
84+
WHEN 'a' THEN 'INSERT'
85+
WHEN 'w' THEN 'UPDATE'
86+
WHEN 'd' THEN 'DELETE'
87+
WHEN '*' THEN 'ALL'
8988
END AS cmd,
9089
pg_catalog.pg_get_expr(pol.polqual, pol.polrelid) AS qual,
9190
pg_catalog.pg_get_expr(pol.polwithcheck, pol.polrelid) AS with_check

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