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diff --git a/doc/src/sgml/ref/revoke.sgml b/doc/src/sgml/ref/revoke.sgml new file mode 100644 index 0000000..b6bac21 --- /dev/null +++ b/doc/src/sgml/ref/revoke.sgml @@ -0,0 +1,311 @@ +<!-- +doc/src/sgml/ref/revoke.sgml +PostgreSQL documentation +--> + +<refentry id="sql-revoke"> + <indexterm zone="sql-revoke"> + <primary>REVOKE</primary> + </indexterm> + + <refmeta> + <refentrytitle>REVOKE</refentrytitle> + <manvolnum>7</manvolnum> + <refmiscinfo>SQL - Language Statements</refmiscinfo> + </refmeta> + + <refnamediv> + <refname>REVOKE</refname> + <refpurpose>remove access privileges</refpurpose> + </refnamediv> + + <refsynopsisdiv> +<synopsis> +REVOKE [ GRANT OPTION FOR ] + { { SELECT | INSERT | UPDATE | DELETE | TRUNCATE | REFERENCES | TRIGGER } + [, ...] | ALL [ PRIVILEGES ] } + ON { [ TABLE ] <replaceable class="parameter">table_name</replaceable> [, ...] + | ALL TABLES IN SCHEMA <replaceable>schema_name</replaceable> [, ...] } + FROM <replaceable class="parameter">role_specification</replaceable> [, ...] + [ CASCADE | RESTRICT ] + +REVOKE [ GRANT OPTION FOR ] + { { SELECT | INSERT | UPDATE | REFERENCES } ( <replaceable class="parameter">column_name</replaceable> [, ...] ) + [, ...] | ALL [ PRIVILEGES ] ( <replaceable class="parameter">column_name</replaceable> [, ...] ) } + ON [ TABLE ] <replaceable class="parameter">table_name</replaceable> [, ...] + FROM <replaceable class="parameter">role_specification</replaceable> [, ...] + [ CASCADE | RESTRICT ] + +REVOKE [ GRANT OPTION FOR ] + { { USAGE | SELECT | UPDATE } + [, ...] | ALL [ PRIVILEGES ] } + ON { SEQUENCE <replaceable class="parameter">sequence_name</replaceable> [, ...] + | ALL SEQUENCES IN SCHEMA <replaceable>schema_name</replaceable> [, ...] } + FROM <replaceable class="parameter">role_specification</replaceable> [, ...] + [ CASCADE | RESTRICT ] + +REVOKE [ GRANT OPTION FOR ] + { { CREATE | CONNECT | TEMPORARY | TEMP } [, ...] | ALL [ PRIVILEGES ] } + ON DATABASE <replaceable>database_name</replaceable> [, ...] + FROM <replaceable class="parameter">role_specification</replaceable> [, ...] + [ CASCADE | RESTRICT ] + +REVOKE [ GRANT OPTION FOR ] + { USAGE | ALL [ PRIVILEGES ] } + ON DOMAIN <replaceable>domain_name</replaceable> [, ...] + FROM <replaceable class="parameter">role_specification</replaceable> [, ...] + [ CASCADE | RESTRICT ] + +REVOKE [ GRANT OPTION FOR ] + { USAGE | ALL [ PRIVILEGES ] } + ON FOREIGN DATA WRAPPER <replaceable>fdw_name</replaceable> [, ...] + FROM <replaceable class="parameter">role_specification</replaceable> [, ...] + [ CASCADE | RESTRICT ] + +REVOKE [ GRANT OPTION FOR ] + { USAGE | ALL [ PRIVILEGES ] } + ON FOREIGN SERVER <replaceable>server_name</replaceable> [, ...] + FROM <replaceable class="parameter">role_specification</replaceable> [, ...] + [ CASCADE | RESTRICT ] + +REVOKE [ GRANT OPTION FOR ] + { EXECUTE | ALL [ PRIVILEGES ] } + ON { { FUNCTION | PROCEDURE | ROUTINE } <replaceable>function_name</replaceable> [ ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">arg_name</replaceable> ] <replaceable class="parameter">arg_type</replaceable> [, ...] ] ) ] [, ...] + | ALL { FUNCTIONS | PROCEDURES | ROUTINES } IN SCHEMA <replaceable>schema_name</replaceable> [, ...] } + FROM <replaceable class="parameter">role_specification</replaceable> [, ...] + [ CASCADE | RESTRICT ] + +REVOKE [ GRANT OPTION FOR ] + { USAGE | ALL [ PRIVILEGES ] } + ON LANGUAGE <replaceable>lang_name</replaceable> [, ...] + FROM <replaceable class="parameter">role_specification</replaceable> [, ...] + [ CASCADE | RESTRICT ] + +REVOKE [ GRANT OPTION FOR ] + { { SELECT | UPDATE } [, ...] | ALL [ PRIVILEGES ] } + ON LARGE OBJECT <replaceable class="parameter">loid</replaceable> [, ...] + FROM <replaceable class="parameter">role_specification</replaceable> [, ...] + [ CASCADE | RESTRICT ] + +REVOKE [ GRANT OPTION FOR ] + { { CREATE | USAGE } [, ...] | ALL [ PRIVILEGES ] } + ON SCHEMA <replaceable>schema_name</replaceable> [, ...] + FROM <replaceable class="parameter">role_specification</replaceable> [, ...] + [ CASCADE | RESTRICT ] + +REVOKE [ GRANT OPTION FOR ] + { CREATE | ALL [ PRIVILEGES ] } + ON TABLESPACE <replaceable>tablespace_name</replaceable> [, ...] + FROM <replaceable class="parameter">role_specification</replaceable> [, ...] + [ CASCADE | RESTRICT ] + +REVOKE [ GRANT OPTION FOR ] + { USAGE | ALL [ PRIVILEGES ] } + ON TYPE <replaceable>type_name</replaceable> [, ...] + FROM <replaceable class="parameter">role_specification</replaceable> [, ...] + [ CASCADE | RESTRICT ] + +REVOKE [ ADMIN OPTION FOR ] + <replaceable class="parameter">role_name</replaceable> [, ...] FROM <replaceable class="parameter">role_specification</replaceable> [, ...] + [ GRANTED BY <replaceable class="parameter">role_specification</replaceable> ] + [ CASCADE | RESTRICT ] + +<phrase>where <replaceable class="parameter">role_specification</replaceable> can be:</phrase> + + [ GROUP ] <replaceable class="parameter">role_name</replaceable> + | PUBLIC + | CURRENT_USER + | SESSION_USER +</synopsis> + </refsynopsisdiv> + + <refsect1 id="sql-revoke-description"> + <title>Description</title> + + <para> + The <command>REVOKE</command> command revokes previously granted + privileges from one or more roles. The key word + <literal>PUBLIC</literal> refers to the implicitly defined group of + all roles. + </para> + + <para> + See the description of the <xref linkend="sql-grant"/> command for + the meaning of the privilege types. + </para> + + <para> + Note that any particular role will have the sum + of privileges granted directly to it, privileges granted to any role it + is presently a member of, and privileges granted to + <literal>PUBLIC</literal>. Thus, for example, revoking <literal>SELECT</literal> privilege + from <literal>PUBLIC</literal> does not necessarily mean that all roles + have lost <literal>SELECT</literal> privilege on the object: those who have it granted + directly or via another role will still have it. Similarly, revoking + <literal>SELECT</literal> from a user might not prevent that user from using + <literal>SELECT</literal> if <literal>PUBLIC</literal> or another membership + role still has <literal>SELECT</literal> rights. + </para> + + <para> + If <literal>GRANT OPTION FOR</literal> is specified, only the grant + option for the privilege is revoked, not the privilege itself. + Otherwise, both the privilege and the grant option are revoked. + </para> + + <para> + If a user holds a privilege with grant option and has granted it to + other users then the privileges held by those other users are + called dependent privileges. If the privilege or the grant option + held by the first user is being revoked and dependent privileges + exist, those dependent privileges are also revoked if + <literal>CASCADE</literal> is specified; if it is not, the revoke action + will fail. This recursive revocation only affects privileges that + were granted through a chain of users that is traceable to the user + that is the subject of this <literal>REVOKE</literal> command. + Thus, the affected users might effectively keep the privilege if it + was also granted through other users. + </para> + + <para> + When revoking privileges on a table, the corresponding column privileges + (if any) are automatically revoked on each column of the table, as well. + On the other hand, if a role has been granted privileges on a table, then + revoking the same privileges from individual columns will have no effect. + </para> + + <para> + When revoking membership in a role, <literal>GRANT OPTION</literal> is instead + called <literal>ADMIN OPTION</literal>, but the behavior is similar. + This form of the command also allows a <literal>GRANTED BY</literal> + option, but that option is currently ignored (except for checking + the existence of the named role). + Note also that this form of the command does not + allow the noise word <literal>GROUP</literal> + in <replaceable class="parameter">role_specification</replaceable>. + </para> + </refsect1> + + <refsect1 id="sql-revoke-notes"> + <title>Notes</title> + + <para> + A user can only revoke privileges that were granted directly by + that user. If, for example, user A has granted a privilege with + grant option to user B, and user B has in turn granted it to user + C, then user A cannot revoke the privilege directly from C. + Instead, user A could revoke the grant option from user B and use + the <literal>CASCADE</literal> option so that the privilege is + in turn revoked from user C. For another example, if both A and B + have granted the same privilege to C, A can revoke their own grant + but not B's grant, so C will still effectively have the privilege. + </para> + + <para> + When a non-owner of an object attempts to <command>REVOKE</command> privileges + on the object, the command will fail outright if the user has no + privileges whatsoever on the object. As long as some privilege is + available, the command will proceed, but it will revoke only those + privileges for which the user has grant options. The <command>REVOKE ALL + PRIVILEGES</command> forms will issue a warning message if no grant options are + held, while the other forms will issue a warning if grant options for + any of the privileges specifically named in the command are not held. + (In principle these statements apply to the object owner as well, but + since the owner is always treated as holding all grant options, the + cases can never occur.) + </para> + + <para> + If a superuser chooses to issue a <command>GRANT</command> or <command>REVOKE</command> + command, the command is performed as though it were issued by the + owner of the affected object. Since all privileges ultimately come + from the object owner (possibly indirectly via chains of grant options), + it is possible for a superuser to revoke all privileges, but this might + require use of <literal>CASCADE</literal> as stated above. + </para> + + <para> + <command>REVOKE</command> can also be done by a role + that is not the owner of the affected object, but is a member of the role + that owns the object, or is a member of a role that holds privileges + <literal>WITH GRANT OPTION</literal> on the object. In this case the + command is performed as though it were issued by the containing role that + actually owns the object or holds the privileges + <literal>WITH GRANT OPTION</literal>. For example, if table + <literal>t1</literal> is owned by role <literal>g1</literal>, of which role + <literal>u1</literal> is a member, then <literal>u1</literal> can revoke privileges + on <literal>t1</literal> that are recorded as being granted by <literal>g1</literal>. + This would include grants made by <literal>u1</literal> as well as by other + members of role <literal>g1</literal>. + </para> + + <para> + If the role executing <command>REVOKE</command> holds privileges + indirectly via more than one role membership path, it is unspecified + which containing role will be used to perform the command. In such cases + it is best practice to use <command>SET ROLE</command> to become the specific + role you want to do the <command>REVOKE</command> as. Failure to do so might + lead to revoking privileges other than the ones you intended, or not + revoking anything at all. + </para> + + <para> + See <xref linkend="ddl-priv"/> for more information about specific + privilege types, as well as how to inspect objects' privileges. + </para> + </refsect1> + + <refsect1 id="sql-revoke-examples"> + <title>Examples</title> + + <para> + Revoke insert privilege for the public on table + <literal>films</literal>: + +<programlisting> +REVOKE INSERT ON films FROM PUBLIC; +</programlisting> + </para> + + <para> + Revoke all privileges from user <literal>manuel</literal> on view + <literal>kinds</literal>: + +<programlisting> +REVOKE ALL PRIVILEGES ON kinds FROM manuel; +</programlisting> + + Note that this actually means <quote>revoke all privileges that I + granted</quote>. + </para> + + <para> + Revoke membership in role <literal>admins</literal> from user <literal>joe</literal>: + +<programlisting> +REVOKE admins FROM joe; +</programlisting></para> + </refsect1> + + <refsect1 id="sql-revoke-compatibility"> + <title>Compatibility</title> + + <para> + The compatibility notes of the <xref linkend="sql-grant"/> command + apply analogously to <command>REVOKE</command>. + The keyword <literal>RESTRICT</literal> or <literal>CASCADE</literal> + is required according to the standard, but <productname>PostgreSQL</productname> + assumes <literal>RESTRICT</literal> by default. + </para> + </refsect1> + + <refsect1> + <title>See Also</title> + + <simplelist type="inline"> + <member><xref linkend="sql-grant"/></member> + <member><xref linkend="sql-alterdefaultprivileges"/></member> + </simplelist> + </refsect1> + +</refentry> |