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Allow users with BYPASSRLS to alter their own passwords.

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The intention in commit 491c029db was to require superuserness to
change the BYPASSRLS property, but the actual effect of the coding
in AlterRole() was to require superuserness to change anything at all
about a BYPASSRLS role.  Other properties of a BYPASSRLS role should
be changeable under the same rules as for a normal role, though.

Fix that, and also take care of some documentation omissions related
to BYPASSRLS and REPLICATION role properties.

Tom Lane and Stephen Frost, per bug report from Wolfgang Walther.
Back-patch to all supported branches.

Discussion: https://postgr.es/m/a5548a9f-89ee-3167-129d-162b5985fcf8@technowledgy.de
This commit is contained in:
Tom Lane 2020-11-03 15:41:32 -05:00
parent bf797a8d97
commit d907bd0543
3 changed files with 18 additions and 7 deletions
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4
doc/src/sgml/ref/alter_role.sgml
View File

@ -71,7 +71,9 @@ ALTER ROLE { <replaceable class="parameter">role_specification</replaceable> | A
Attributes not mentioned in the command retain their previous settings.
Database superusers can change any of these settings for any role.
Roles having <literal>CREATEROLE</literal> privilege can change any of these
settings, but only for non-superuser and non-replication roles.
settings except <literal>SUPERUSER</literal>, <literal>REPLICATION</literal>,
and <literal>BYPASSRLS</literal>; but only for non-superuser and
non-replication roles.
Ordinary roles can only change their own password.
</para>

11
doc/src/sgml/ref/create_role.sgml
View File

@ -181,6 +181,8 @@ in sync when changing the above synopsis!
highly privileged role, and should only be used on roles actually
used for replication. If not specified,
<literal>NOREPLICATION</literal> is the default.
You must be a superuser to create a new role having the
<literal>REPLICATION</literal> attribute.
</para>
</listitem>
</varlistentry>
@ -192,11 +194,16 @@ in sync when changing the above synopsis!
<para>
These clauses determine whether a role bypasses every row-level
security (RLS) policy. <literal>NOBYPASSRLS</literal> is the default.
You must be a superuser to create a new role having
the <literal>BYPASSRLS</literal> attribute.
</para>
<para>
Note that pg_dump will set <literal>row_security</literal> to
<literal>OFF</literal> by default, to ensure all contents of a table are
dumped out. If the user running pg_dump does not have appropriate
permissions, an error will be returned. The superuser and owner of the
table being dumped always bypass RLS.
permissions, an error will be returned. However, superusers and the
owner of the table being dumped always bypass RLS.
</para>
</listitem>
</varlistentry>

10
src/backend/commands/user.c
View File

@ -709,8 +709,10 @@ AlterRole(AlterRoleStmt *stmt)
roleid = authform->oid;
/*
* To mess with a superuser you gotta be superuser; else you need
* createrole, or just want to change your own password
* To mess with a superuser or replication role in any way you gotta be
* superuser. We also insist on superuser to change the BYPASSRLS
* property. Otherwise, if you don't have createrole, you're only allowed
* to change your own password.
*/
if (authform->rolsuper || issuper >= 0)
{
@ -726,7 +728,7 @@ AlterRole(AlterRoleStmt *stmt)
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("must be superuser to alter replication users")));
}
else if (authform->rolbypassrls || bypassrls >= 0)
else if (bypassrls >= 0)
{
if (!superuser())
ereport(ERROR,
@ -735,11 +737,11 @@ AlterRole(AlterRoleStmt *stmt)
}
else if (!have_createrole_privilege())
{
/* We already checked issuper, isreplication, and bypassrls */
if (!(inherit < 0 &&
createrole < 0 &&
createdb < 0 &&
canlogin < 0 &&
isreplication < 0 &&
!dconnlimit &&
!rolemembers &&
!validUntil &&