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Add new GUC createrole_self_grant.

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Can be set to the empty string, or to either or both of "set" or
"inherit". If set to a non-empty value, a non-superuser who creates
a role (necessarily by relying up the CREATEROLE privilege) will
grant that role back to themselves with the specified options.

This isn't a security feature, because the grant that this feature
triggers can also be performed explicitly. Instead, it's a user experience
feature. A superuser would necessarily inherit the privileges of any
created role and be able to access all such roles via SET ROLE;
with this patch, you can configure createrole_self_grant = 'set, inherit'
to provide a similar experience for a user who has CREATEROLE but not
SUPERUSER.

Discussion: https://postgr.es/m/CA+TgmobN59ct+Emmz6ig1Nua2Q-_o=r6DSD98KfU53kctq_kQw@mail.gmail.com
This commit is contained in:
Robert Haas 2023-01-10 12:44:49 -05:00
parent cf5eb37c5e
commit e5b8a4c098
9 changed files with 220 additions and 5 deletions
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33
doc/src/sgml/config.sgml
View File

@ -9447,6 +9447,39 @@ SET XML OPTION { DOCUMENT | CONTENT };
</listitem>
</varlistentry>
<varlistentry id="guc-createrole-self-grant" xreflabel="createrole_self_grant">
<term><varname>createrole_self_grant</varname> (<type>string</type>)
<indexterm>
<primary><varname>createrole_self_grant</varname></primary>
<secondary>configuration parameter</secondary>
</indexterm>
</term>
<listitem>
<para>
If a user who has <literal>CREATEROLE</literal> but not
<literal>SUPERUSER</literal> creates a role, and if this
is set to a non-empty value, the newly-created role will be granted
to the creating user with the options specified. The value must be
<literal>set</literal>, <literal>inherit</literal>, or a
comma-separated list of these.
</para>
<para>
The purpose of this option is to allow a <literal>CREATEROLE</literal>
user who is not a superuser to automatically inherit, or automatically
gain the ability to <literal>SET ROLE</literal> to, any created users.
Since a <literal>CREATEROLE</literal> user is always implicitly granted
<literal>ADMIN OPTION</literal> on created roles, that user could
always execute a <literal>GRANT</literal> statement that would achieve
the same effect as this setting. However, it can be convenient for
usability reasons if the grant happens automatically. A superuser
automatically inherits the privileges of every role and can always
<literal>SET ROLE</literal> to any role, and this setting can be used
to produce a similar behavior for <literal>CREATEROLE</literal> users
for users which they create.
</para>
</listitem>
</varlistentry>
</variablelist>
</sect2>
<sect2 id="runtime-config-client-format">

1
doc/src/sgml/ref/create_role.sgml
View File

@ -506,6 +506,7 @@ CREATE ROLE <replaceable class="parameter">name</replaceable> [ WITH ADMIN <repl
<member><xref linkend="sql-grant"/></member>
<member><xref linkend="sql-revoke"/></member>
<member><xref linkend="app-createuser"/></member>
<member><xref linkend="guc-createrole-self-grant"/></member>
</simplelist>
</refsect1>
</refentry>

1
doc/src/sgml/ref/createuser.sgml
View File

@ -555,6 +555,7 @@ PostgreSQL documentation
<simplelist type="inline">
<member><xref linkend="app-dropuser"/></member>
<member><xref linkend="sql-createrole"/></member>
<member><xref linkend="guc-createrole-self-grant"/></member>
</simplelist>
</refsect1>

97
src/backend/commands/user.c
View File

@ -39,6 +39,7 @@
#include "utils/fmgroids.h"
#include "utils/syscache.h"
#include "utils/timestamp.h"
#include "utils/varlena.h"
/*
* Removing a role grant - or the admin option on it - might recurse to
@ -81,8 +82,11 @@ typedef struct
#define GRANT_ROLE_SPECIFIED_INHERIT 0x0002
#define GRANT_ROLE_SPECIFIED_SET 0x0004
/* GUC parameter */
/* GUC parameters */
int Password_encryption = PASSWORD_TYPE_SCRAM_SHA_256;
char *createrole_self_grant = "";
bool createrole_self_grant_enabled = false;
GrantRoleOptions createrole_self_grant_options;
/* Hook to check passwords in CreateRole() and AlterRole() */
check_password_hook_type check_password_hook = NULL;
@ -532,10 +536,13 @@ CreateRole(ParseState *pstate, CreateRoleStmt *stmt)
if (!superuser())
{
RoleSpec *current_role = makeNode(RoleSpec);
GrantRoleOptions poptself;
GrantRoleOptions poptself;
List *memberSpecs;
List *memberIds = list_make1_oid(currentUserId);
current_role->roletype = ROLESPEC_CURRENT_ROLE;
current_role->location = -1;
memberSpecs = list_make1(current_role);
poptself.specified = GRANT_ROLE_SPECIFIED_ADMIN
| GRANT_ROLE_SPECIFIED_INHERIT
@ -545,7 +552,7 @@ CreateRole(ParseState *pstate, CreateRoleStmt *stmt)
poptself.set = false;
AddRoleMems(BOOTSTRAP_SUPERUSERID, stmt->role, roleid,
list_make1(current_role), list_make1_oid(GetUserId()),
memberSpecs, memberIds,
BOOTSTRAP_SUPERUSERID, &poptself);
/*
@ -553,6 +560,20 @@ CreateRole(ParseState *pstate, CreateRoleStmt *stmt)
* the additional grants will fail.
*/
CommandCounterIncrement();
/*
* Because of the implicit grant above, a CREATEROLE user who creates
* a role has the ability to grant that role back to themselves with
* the INHERIT or SET options, if they wish to inherit the role's
* privileges or be able to SET ROLE to it. The createrole_self_grant
* GUC can be used to make this happen automatically. This has no
* security implications since the same user is able to make the same
* grant using an explicit GRANT statement; it's just convenient.
*/
if (createrole_self_grant_enabled)
AddRoleMems(currentUserId, stmt->role, roleid,
memberSpecs, memberIds,
currentUserId, &createrole_self_grant_options);
}
/*
@ -2414,3 +2435,73 @@ InitGrantRoleOptions(GrantRoleOptions *popt)
popt->inherit = false;
popt->set = true;
}
/*
* GUC check_hook for createrole_self_grant
*/
bool
check_createrole_self_grant(char **newval, void **extra, GucSource source)
{
char *rawstring;
List *elemlist;
ListCell *l;
unsigned options = 0;
unsigned *result;
/* Need a modifiable copy of string */
rawstring = pstrdup(*newval);
if (!SplitIdentifierString(rawstring, ',', &elemlist))
{
/* syntax error in list */
GUC_check_errdetail("List syntax is invalid.");
pfree(rawstring);
list_free(elemlist);
return false;
}
foreach(l, elemlist)
{
char *tok = (char *) lfirst(l);
if (pg_strcasecmp(tok, "SET") == 0)
options |= GRANT_ROLE_SPECIFIED_SET;
else if (pg_strcasecmp(tok, "INHERIT") == 0)
options |= GRANT_ROLE_SPECIFIED_INHERIT;
else
{
GUC_check_errdetail("Unrecognized key word: \"%s\".", tok);
pfree(rawstring);
list_free(elemlist);
return false;
}
}
pfree(rawstring);
list_free(elemlist);
result = (unsigned *) guc_malloc(LOG, sizeof(unsigned));
*result = options;
*extra = result;
return true;
}
/*
* GUC assign_hook for createrole_self_grant
*/
void
assign_createrole_self_grant(const char *newval, void *extra)
{
unsigned options = * (unsigned *) extra;
createrole_self_grant_enabled = (options != 0);
createrole_self_grant_options.specified = GRANT_ROLE_SPECIFIED_ADMIN
| GRANT_ROLE_SPECIFIED_INHERIT
| GRANT_ROLE_SPECIFIED_SET;
createrole_self_grant_options.admin = false;
createrole_self_grant_options.inherit =
(options & GRANT_ROLE_SPECIFIED_INHERIT) != 0;
createrole_self_grant_options.set =
(options & GRANT_ROLE_SPECIFIED_SET) != 0;
}

12
src/backend/utils/misc/guc_tables.c
View File

@ -3949,6 +3949,18 @@ struct config_string ConfigureNamesString[] =
check_temp_tablespaces, assign_temp_tablespaces, NULL
},
{
{"createrole_self_grant", PGC_USERSET, CLIENT_CONN_STATEMENT,
gettext_noop("Sets whether a CREATEROLE user automatically grants "
"the role to themselves, and with which options."),
NULL,
GUC_LIST_INPUT
},
&createrole_self_grant,
"",
check_createrole_self_grant, assign_createrole_self_grant, NULL
},
{
{"dynamic_library_path", PGC_SUSET, CLIENT_CONN_OTHER,
gettext_noop("Sets the path for dynamically loadable modules."),

1
src/backend/utils/misc/postgresql.conf.sample
View File

@ -703,6 +703,7 @@
#xmlbinary = 'base64'
#xmloption = 'content'
#gin_pending_list_limit = 4MB
#createrole_self_grant = '' # set and/or inherit
# - Locale and Formatting -

10
src/include/commands/user.h
View File

@ -15,9 +15,11 @@
#include "libpq/crypt.h"
#include "nodes/parsenodes.h"
#include "parser/parse_node.h"
#include "utils/guc.h"
/* GUC. Is actually of type PasswordType. */
extern PGDLLIMPORT int Password_encryption;
/* GUCs */
extern PGDLLIMPORT int Password_encryption; /* values from enum PasswordType */
extern PGDLLIMPORT char *createrole_self_grant;
/* Hook to check passwords in CreateRole() and AlterRole() */
typedef void (*check_password_hook_type) (const char *username, const char *shadow_pass, PasswordType password_type, Datum validuntil_time, bool validuntil_null);
@ -34,4 +36,8 @@ extern void DropOwnedObjects(DropOwnedStmt *stmt);
extern void ReassignOwnedObjects(ReassignOwnedStmt *stmt);
extern List *roleSpecsToIds(List *memberNames);
extern bool check_createrole_self_grant(char **newval, void **extra,
GucSource source);
extern void assign_createrole_self_grant(const char *newval, void *extra);
#endif /* USER_H */

33
src/test/regress/expected/create_role.out
View File

@ -1,6 +1,7 @@
-- ok, superuser can create users with any set of privileges
CREATE ROLE regress_role_super SUPERUSER;
CREATE ROLE regress_role_admin CREATEDB CREATEROLE REPLICATION BYPASSRLS;
GRANT CREATE ON DATABASE regression TO regress_role_admin WITH GRANT OPTION;
CREATE ROLE regress_role_normal;
-- fail, only superusers can create users with these privileges
SET SESSION AUTHORIZATION regress_role_admin;
@ -15,6 +16,7 @@ ERROR: must be superuser to create bypassrls users
-- ok, having CREATEROLE is enough to create users with these privileges
CREATE ROLE regress_createdb CREATEDB;
CREATE ROLE regress_createrole CREATEROLE NOINHERIT;
GRANT CREATE ON DATABASE regression TO regress_createrole WITH GRANT OPTION;
CREATE ROLE regress_login LOGIN;
CREATE ROLE regress_inherit INHERIT;
CREATE ROLE regress_connection_limit CONNECTION LIMIT 5;
@ -83,9 +85,37 @@ ALTER VIEW tenant_view OWNER TO regress_role_admin;
ERROR: must be owner of view tenant_view
DROP VIEW tenant_view;
ERROR: must be owner of view tenant_view
-- fail, can't create objects owned as regress_tenant
CREATE SCHEMA regress_tenant_schema AUTHORIZATION regress_tenant;
ERROR: must be able to SET ROLE "regress_tenant"
-- fail, we don't inherit permissions from regress_tenant
REASSIGN OWNED BY regress_tenant TO regress_createrole;
ERROR: permission denied to reassign objects
-- ok, create a role with a value for createrole_self_grant
SET createrole_self_grant = 'set, inherit';
CREATE ROLE regress_tenant2;
GRANT CREATE ON DATABASE regression TO regress_tenant2;
-- ok, regress_tenant2 can create objects within the database
SET SESSION AUTHORIZATION regress_tenant2;
CREATE TABLE tenant2_table (i integer);
REVOKE ALL PRIVILEGES ON tenant2_table FROM PUBLIC;
-- ok, because we have SET and INHERIT on regress_tenant2
SET SESSION AUTHORIZATION regress_createrole;
CREATE SCHEMA regress_tenant2_schema AUTHORIZATION regress_tenant2;
ALTER SCHEMA regress_tenant2_schema OWNER TO regress_createrole;
ALTER TABLE tenant2_table OWNER TO regress_createrole;
ALTER TABLE tenant2_table OWNER TO regress_tenant2;
-- with SET but not INHERIT, we can give away objects but not take them
REVOKE INHERIT OPTION FOR regress_tenant2 FROM regress_createrole;
ALTER SCHEMA regress_tenant2_schema OWNER TO regress_tenant2;
ALTER TABLE tenant2_table OWNER TO regress_createrole;
ERROR: must be owner of table tenant2_table
-- with INHERIT but not SET, we can take objects but not give them away
GRANT regress_tenant2 TO regress_createrole WITH INHERIT TRUE, SET FALSE;
ALTER TABLE tenant2_table OWNER TO regress_createrole;
ALTER TABLE tenant2_table OWNER TO regress_tenant2;
ERROR: must be able to SET ROLE "regress_tenant2"
DROP TABLE tenant2_table;
-- fail, CREATEROLE is not enough to create roles in privileged roles
CREATE ROLE regress_read_all_data IN ROLE pg_read_all_data;
ERROR: must have admin option on role "pg_read_all_data"
@ -131,6 +161,8 @@ ERROR: role "regress_nosuch_recursive" does not exist
DROP ROLE regress_nosuch_admin_recursive;
ERROR: role "regress_nosuch_admin_recursive" does not exist
DROP ROLE regress_plainrole;
-- must revoke privileges before dropping role
REVOKE CREATE ON DATABASE regression FROM regress_createrole CASCADE;
-- ok, should be able to drop non-superuser roles we created
DROP ROLE regress_createdb;
DROP ROLE regress_createrole;
@ -149,6 +181,7 @@ DROP ROLE regress_role_admin;
ERROR: current user cannot be dropped
-- ok
RESET SESSION AUTHORIZATION;
REVOKE CREATE ON DATABASE regression FROM regress_role_admin CASCADE;
DROP INDEX tenant_idx;
DROP TABLE tenant_table;
DROP VIEW tenant_view;

37
src/test/regress/sql/create_role.sql
View File

@ -1,6 +1,7 @@
-- ok, superuser can create users with any set of privileges
CREATE ROLE regress_role_super SUPERUSER;
CREATE ROLE regress_role_admin CREATEDB CREATEROLE REPLICATION BYPASSRLS;
GRANT CREATE ON DATABASE regression TO regress_role_admin WITH GRANT OPTION;
CREATE ROLE regress_role_normal;
-- fail, only superusers can create users with these privileges
@ -13,6 +14,7 @@ CREATE ROLE regress_nosuch_bypassrls BYPASSRLS;
-- ok, having CREATEROLE is enough to create users with these privileges
CREATE ROLE regress_createdb CREATEDB;
CREATE ROLE regress_createrole CREATEROLE NOINHERIT;
GRANT CREATE ON DATABASE regression TO regress_createrole WITH GRANT OPTION;
CREATE ROLE regress_login LOGIN;
CREATE ROLE regress_inherit INHERIT;
CREATE ROLE regress_connection_limit CONNECTION LIMIT 5;
@ -83,9 +85,40 @@ DROP TABLE tenant_table;
ALTER VIEW tenant_view OWNER TO regress_role_admin;
DROP VIEW tenant_view;
-- fail, can't create objects owned as regress_tenant
CREATE SCHEMA regress_tenant_schema AUTHORIZATION regress_tenant;
-- fail, we don't inherit permissions from regress_tenant
REASSIGN OWNED BY regress_tenant TO regress_createrole;
-- ok, create a role with a value for createrole_self_grant
SET createrole_self_grant = 'set, inherit';
CREATE ROLE regress_tenant2;
GRANT CREATE ON DATABASE regression TO regress_tenant2;
-- ok, regress_tenant2 can create objects within the database
SET SESSION AUTHORIZATION regress_tenant2;
CREATE TABLE tenant2_table (i integer);
REVOKE ALL PRIVILEGES ON tenant2_table FROM PUBLIC;
-- ok, because we have SET and INHERIT on regress_tenant2
SET SESSION AUTHORIZATION regress_createrole;
CREATE SCHEMA regress_tenant2_schema AUTHORIZATION regress_tenant2;
ALTER SCHEMA regress_tenant2_schema OWNER TO regress_createrole;
ALTER TABLE tenant2_table OWNER TO regress_createrole;
ALTER TABLE tenant2_table OWNER TO regress_tenant2;
-- with SET but not INHERIT, we can give away objects but not take them
REVOKE INHERIT OPTION FOR regress_tenant2 FROM regress_createrole;
ALTER SCHEMA regress_tenant2_schema OWNER TO regress_tenant2;
ALTER TABLE tenant2_table OWNER TO regress_createrole;
-- with INHERIT but not SET, we can take objects but not give them away
GRANT regress_tenant2 TO regress_createrole WITH INHERIT TRUE, SET FALSE;
ALTER TABLE tenant2_table OWNER TO regress_createrole;
ALTER TABLE tenant2_table OWNER TO regress_tenant2;
DROP TABLE tenant2_table;
-- fail, CREATEROLE is not enough to create roles in privileged roles
CREATE ROLE regress_read_all_data IN ROLE pg_read_all_data;
CREATE ROLE regress_write_all_data IN ROLE pg_write_all_data;
@ -113,6 +146,9 @@ DROP ROLE regress_nosuch_recursive;
DROP ROLE regress_nosuch_admin_recursive;
DROP ROLE regress_plainrole;
-- must revoke privileges before dropping role
REVOKE CREATE ON DATABASE regression FROM regress_createrole CASCADE;
-- ok, should be able to drop non-superuser roles we created
DROP ROLE regress_createdb;
DROP ROLE regress_createrole;
@ -131,6 +167,7 @@ DROP ROLE regress_role_admin;
-- ok
RESET SESSION AUTHORIZATION;
REVOKE CREATE ON DATABASE regression FROM regress_role_admin CASCADE;
DROP INDEX tenant_idx;
DROP TABLE tenant_table;
DROP VIEW tenant_view;