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PostgreSQL before 8.4.20, 9.0.x before 9.0.16, 9.1.x before 9.1.12, 9.2.x before 9.2.7, and 9.3.x before 9.3.3 does not properly enforce the ADMIN OPTION restriction, which allows remote authenticated members of a role to add or remove arbitrary users to that role by calling the SET ROLE command before the associated GRANT command. http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-0060 Signed-off-by: Yue Tao <Yue.Tao@windriver.com> Signed-off-by: Kai Kang <kai.kang@windriver.com> Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
274 lines
12 KiB
Diff
274 lines
12 KiB
Diff
From 15a8f97b9d16aaf659f58c981242b9da591cf24c Mon Sep 17 00:00:00 2001
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From: Noah Misch <noah@leadboat.com>
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Date: Mon, 17 Feb 2014 09:33:31 -0500
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Subject: [PATCH] Shore up ADMIN OPTION restrictions.
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commit 15a8f97b9d16aaf659f58c981242b9da591cf24c REL9_2_STABLE
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Granting a role without ADMIN OPTION is supposed to prevent the grantee
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from adding or removing members from the granted role. Issuing SET ROLE
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before the GRANT bypassed that, because the role itself had an implicit
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right to add or remove members. Plug that hole by recognizing that
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implicit right only when the session user matches the current role.
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Additionally, do not recognize it during a security-restricted operation
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or during execution of a SECURITY DEFINER function. The restriction on
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SECURITY DEFINER is not security-critical. However, it seems best for a
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user testing his own SECURITY DEFINER function to see the same behavior
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others will see. Back-patch to 8.4 (all supported versions).
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The SQL standards do not conflate roles and users as PostgreSQL does;
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only SQL roles have members, and only SQL users initiate sessions. An
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application using PostgreSQL users and roles as SQL users and roles will
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never attempt to grant membership in the role that is the session user,
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so the implicit right to add or remove members will never arise.
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The security impact was mostly that a role member could revoke access
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from others, contrary to the wishes of his own grantor. Unapproved role
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member additions are less notable, because the member can still largely
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achieve that by creating a view or a SECURITY DEFINER function.
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Reviewed by Andres Freund and Tom Lane. Reported, independently, by
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Jonas Sundman and Noah Misch.
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Security: CVE-2014-0060
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Upstream-Status: Backport
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Signed-off-by: Kai Kang <kai.kang@windriver.com>
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---
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doc/src/sgml/ref/grant.sgml | 12 ++++---
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src/backend/commands/user.c | 11 ++++++-
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src/backend/utils/adt/acl.c | 50 ++++++++++++++++++++++++------
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src/test/regress/expected/privileges.out | 36 +++++++++++++++++++++-
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src/test/regress/sql/privileges.sql | 29 ++++++++++++++++-
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5 files changed, 120 insertions(+), 18 deletions(-)
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diff --git a/doc/src/sgml/ref/grant.sgml b/doc/src/sgml/ref/grant.sgml
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index fb81af4..2b5a843 100644
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--- a/doc/src/sgml/ref/grant.sgml
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+++ b/doc/src/sgml/ref/grant.sgml
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@@ -396,11 +396,13 @@ GRANT <replaceable class="PARAMETER">role_name</replaceable> [, ...] TO <replace
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<para>
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If <literal>WITH ADMIN OPTION</literal> is specified, the member can
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in turn grant membership in the role to others, and revoke membership
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- in the role as well. Without the admin option, ordinary users cannot do
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- that. However,
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- database superusers can grant or revoke membership in any role to anyone.
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- Roles having <literal>CREATEROLE</> privilege can grant or revoke
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- membership in any role that is not a superuser.
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+ in the role as well. Without the admin option, ordinary users cannot
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+ do that. A role is not considered to hold <literal>WITH ADMIN
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+ OPTION</literal> on itself, but it may grant or revoke membership in
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+ itself from a database session where the session user matches the
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+ role. Database superusers can grant or revoke membership in any role
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+ to anyone. Roles having <literal>CREATEROLE</> privilege can grant
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+ or revoke membership in any role that is not a superuser.
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</para>
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<para>
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diff --git a/src/backend/commands/user.c b/src/backend/commands/user.c
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index a22092c..39bf172 100644
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--- a/src/backend/commands/user.c
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+++ b/src/backend/commands/user.c
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@@ -1334,7 +1334,16 @@ AddRoleMems(const char *rolename, Oid roleid,
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rolename)));
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}
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- /* XXX not sure about this check */
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+ /*
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+ * The role membership grantor of record has little significance at
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+ * present. Nonetheless, inasmuch as users might look to it for a crude
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+ * audit trail, let only superusers impute the grant to a third party.
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+ *
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+ * Before lifting this restriction, give the member == role case of
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+ * is_admin_of_role() a fresh look. Ensure that the current role cannot
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+ * use an explicit grantor specification to take advantage of the session
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+ * user's self-admin right.
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+ */
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if (grantorId != GetUserId() && !superuser())
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ereport(ERROR,
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(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
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diff --git a/src/backend/utils/adt/acl.c b/src/backend/utils/adt/acl.c
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index 1d6ae8b..9a52edb 100644
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--- a/src/backend/utils/adt/acl.c
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+++ b/src/backend/utils/adt/acl.c
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@@ -4580,6 +4580,11 @@ pg_role_aclcheck(Oid role_oid, Oid roleid, AclMode mode)
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{
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if (mode & ACL_GRANT_OPTION_FOR(ACL_CREATE))
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{
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+ /*
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+ * XXX For roleid == role_oid, is_admin_of_role() also examines the
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+ * session and call stack. That suits two-argument pg_has_role(), but
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+ * it gives the three-argument version a lamentable whimsy.
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+ */
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if (is_admin_of_role(roleid, role_oid))
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return ACLCHECK_OK;
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}
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@@ -4897,11 +4902,9 @@ is_member_of_role_nosuper(Oid member, Oid role)
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/*
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- * Is member an admin of role (directly or indirectly)? That is, is it
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- * a member WITH ADMIN OPTION?
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- *
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- * We could cache the result as for is_member_of_role, but currently this
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- * is not used in any performance-critical paths, so we don't.
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+ * Is member an admin of role? That is, is member the role itself (subject to
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+ * restrictions below), a member (directly or indirectly) WITH ADMIN OPTION,
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+ * or a superuser?
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*/
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bool
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is_admin_of_role(Oid member, Oid role)
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@@ -4910,14 +4913,41 @@ is_admin_of_role(Oid member, Oid role)
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List *roles_list;
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ListCell *l;
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- /* Fast path for simple case */
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- if (member == role)
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- return true;
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-
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- /* Superusers have every privilege, so are part of every role */
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if (superuser_arg(member))
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return true;
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+ if (member == role)
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+ /*
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+ * A role can admin itself when it matches the session user and we're
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+ * outside any security-restricted operation, SECURITY DEFINER or
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+ * similar context. SQL-standard roles cannot self-admin. However,
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+ * SQL-standard users are distinct from roles, and they are not
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+ * grantable like roles: PostgreSQL's role-user duality extends the
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+ * standard. Checking for a session user match has the effect of
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+ * letting a role self-admin only when it's conspicuously behaving
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+ * like a user. Note that allowing self-admin under a mere SET ROLE
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+ * would make WITH ADMIN OPTION largely irrelevant; any member could
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+ * SET ROLE to issue the otherwise-forbidden command.
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+ *
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+ * Withholding self-admin in a security-restricted operation prevents
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+ * object owners from harnessing the session user identity during
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+ * administrative maintenance. Suppose Alice owns a database, has
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+ * issued "GRANT alice TO bob", and runs a daily ANALYZE. Bob creates
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+ * an alice-owned SECURITY DEFINER function that issues "REVOKE alice
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+ * FROM carol". If he creates an expression index calling that
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+ * function, Alice will attempt the REVOKE during each ANALYZE.
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+ * Checking InSecurityRestrictedOperation() thwarts that attack.
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+ *
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+ * Withholding self-admin in SECURITY DEFINER functions makes their
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+ * behavior independent of the calling user. There's no security or
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+ * SQL-standard-conformance need for that restriction, though.
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+ *
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+ * A role cannot have actual WITH ADMIN OPTION on itself, because that
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+ * would imply a membership loop. Therefore, we're done either way.
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+ */
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+ return member == GetSessionUserId() &&
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+ !InLocalUserIdChange() && !InSecurityRestrictedOperation();
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+
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/*
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* Find all the roles that member is a member of, including multi-level
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* recursion. We build a list in the same way that is_member_of_role does
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diff --git a/src/test/regress/expected/privileges.out b/src/test/regress/expected/privileges.out
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index e8930cb..bc6d731 100644
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--- a/src/test/regress/expected/privileges.out
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+++ b/src/test/regress/expected/privileges.out
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@@ -32,7 +32,7 @@ ALTER GROUP regressgroup1 ADD USER regressuser4;
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ALTER GROUP regressgroup2 ADD USER regressuser2; -- duplicate
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NOTICE: role "regressuser2" is already a member of role "regressgroup2"
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ALTER GROUP regressgroup2 DROP USER regressuser2;
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-ALTER GROUP regressgroup2 ADD USER regressuser4;
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+GRANT regressgroup2 TO regressuser4 WITH ADMIN OPTION;
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-- test owner privileges
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SET SESSION AUTHORIZATION regressuser1;
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SELECT session_user, current_user;
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@@ -929,6 +929,40 @@ SELECT has_table_privilege('regressuser1', 'atest4', 'SELECT WITH GRANT OPTION')
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t
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(1 row)
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+-- Admin options
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+SET SESSION AUTHORIZATION regressuser4;
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+CREATE FUNCTION dogrant_ok() RETURNS void LANGUAGE sql SECURITY DEFINER AS
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+ 'GRANT regressgroup2 TO regressuser5';
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+GRANT regressgroup2 TO regressuser5; -- ok: had ADMIN OPTION
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+SET ROLE regressgroup2;
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+GRANT regressgroup2 TO regressuser5; -- fails: SET ROLE suspended privilege
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+ERROR: must have admin option on role "regressgroup2"
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+SET SESSION AUTHORIZATION regressuser1;
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+GRANT regressgroup2 TO regressuser5; -- fails: no ADMIN OPTION
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+ERROR: must have admin option on role "regressgroup2"
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+SELECT dogrant_ok(); -- ok: SECURITY DEFINER conveys ADMIN
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+NOTICE: role "regressuser5" is already a member of role "regressgroup2"
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+CONTEXT: SQL function "dogrant_ok" statement 1
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+ dogrant_ok
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+------------
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+
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+(1 row)
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+
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+SET ROLE regressgroup2;
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+GRANT regressgroup2 TO regressuser5; -- fails: SET ROLE did not help
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+ERROR: must have admin option on role "regressgroup2"
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+SET SESSION AUTHORIZATION regressgroup2;
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+GRANT regressgroup2 TO regressuser5; -- ok: a role can self-admin
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+NOTICE: role "regressuser5" is already a member of role "regressgroup2"
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+CREATE FUNCTION dogrant_fails() RETURNS void LANGUAGE sql SECURITY DEFINER AS
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+ 'GRANT regressgroup2 TO regressuser5';
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+SELECT dogrant_fails(); -- fails: no self-admin in SECURITY DEFINER
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+ERROR: must have admin option on role "regressgroup2"
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+CONTEXT: SQL function "dogrant_fails" statement 1
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+DROP FUNCTION dogrant_fails();
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+SET SESSION AUTHORIZATION regressuser4;
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+DROP FUNCTION dogrant_ok();
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+REVOKE regressgroup2 FROM regressuser5;
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-- has_sequence_privilege tests
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\c -
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CREATE SEQUENCE x_seq;
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diff --git a/src/test/regress/sql/privileges.sql b/src/test/regress/sql/privileges.sql
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index d4d328e..5f1018a 100644
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--- a/src/test/regress/sql/privileges.sql
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+++ b/src/test/regress/sql/privileges.sql
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@@ -37,7 +37,7 @@ ALTER GROUP regressgroup1 ADD USER regressuser4;
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ALTER GROUP regressgroup2 ADD USER regressuser2; -- duplicate
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ALTER GROUP regressgroup2 DROP USER regressuser2;
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-ALTER GROUP regressgroup2 ADD USER regressuser4;
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+GRANT regressgroup2 TO regressuser4 WITH ADMIN OPTION;
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-- test owner privileges
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@@ -581,6 +581,33 @@ SELECT has_table_privilege('regressuser3', 'atest4', 'SELECT'); -- false
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SELECT has_table_privilege('regressuser1', 'atest4', 'SELECT WITH GRANT OPTION'); -- true
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+-- Admin options
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+
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+SET SESSION AUTHORIZATION regressuser4;
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+CREATE FUNCTION dogrant_ok() RETURNS void LANGUAGE sql SECURITY DEFINER AS
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+ 'GRANT regressgroup2 TO regressuser5';
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+GRANT regressgroup2 TO regressuser5; -- ok: had ADMIN OPTION
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+SET ROLE regressgroup2;
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+GRANT regressgroup2 TO regressuser5; -- fails: SET ROLE suspended privilege
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+
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+SET SESSION AUTHORIZATION regressuser1;
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+GRANT regressgroup2 TO regressuser5; -- fails: no ADMIN OPTION
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+SELECT dogrant_ok(); -- ok: SECURITY DEFINER conveys ADMIN
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+SET ROLE regressgroup2;
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+GRANT regressgroup2 TO regressuser5; -- fails: SET ROLE did not help
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+
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+SET SESSION AUTHORIZATION regressgroup2;
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+GRANT regressgroup2 TO regressuser5; -- ok: a role can self-admin
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+CREATE FUNCTION dogrant_fails() RETURNS void LANGUAGE sql SECURITY DEFINER AS
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+ 'GRANT regressgroup2 TO regressuser5';
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+SELECT dogrant_fails(); -- fails: no self-admin in SECURITY DEFINER
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+DROP FUNCTION dogrant_fails();
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+
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+SET SESSION AUTHORIZATION regressuser4;
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+DROP FUNCTION dogrant_ok();
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+REVOKE regressgroup2 FROM regressuser5;
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+
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+
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-- has_sequence_privilege tests
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\c -
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--
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1.7.5.4
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