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executor, privileges: fix privilege check fail for CREATE USER and … #11814

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merged 2 commits into from
Aug 25, 2019
Merged

executor, privileges: fix privilege check fail for CREATE USER and … #11814

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06cef5f
executor, privileges: fix privilege check fail for `CREATE USER` and …
Aug 19, 2019
b84801c
Merge branch 'release-3.0' into fix9111_30
sre-bot Aug 25, 2019
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75 changes: 58 additions & 17 deletions executor/simple.go
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Original file line number Diff line number Diff line change
Expand Up @@ -609,6 +609,23 @@ func (e *SimpleExec) executeRollback(s *ast.RollbackStmt) error {
}

func (e *SimpleExec) executeCreateUser(ctx context.Context, s *ast.CreateUserStmt) error {
// Check `CREATE USER` privilege.
if !config.GetGlobalConfig().Security.SkipGrantTable {
checker := privilege.GetPrivilegeManager(e.ctx)
if checker == nil {
return errors.New("miss privilege checker")
}
activeRoles := e.ctx.GetSessionVars().ActiveRoles
if !checker.RequestVerification(activeRoles, mysql.SystemDB, mysql.UserTable, "", mysql.InsertPriv) {
if s.IsCreateRole && !checker.RequestVerification(activeRoles, "", "", "", mysql.CreateRolePriv) {
return core.ErrSpecificAccessDenied.GenWithStackByArgs("CREATE ROLE")
}
if !s.IsCreateRole && !checker.RequestVerification(activeRoles, "", "", "", mysql.CreateUserPriv) {
return core.ErrSpecificAccessDenied.GenWithStackByArgs("CREATE User")
}
}
}

users := make([]string, 0, len(s.Specs))
for _, spec := range s.Specs {
exists, err1 := userExists(e.ctx, spec.User.Username, spec.User.Hostname)
Expand Down Expand Up @@ -639,7 +656,7 @@ func (e *SimpleExec) executeCreateUser(ctx context.Context, s *ast.CreateUserStm
if s.IsCreateRole {
sql = fmt.Sprintf(`INSERT INTO %s.%s (Host, User, Password, Account_locked) VALUES %s;`, mysql.SystemDB, mysql.UserTable, strings.Join(users, ", "))
}
_, err := e.ctx.(sqlexec.SQLExecutor).Execute(context.Background(), sql)
_, _, err := e.ctx.(sqlexec.RestrictedSQLExecutor).ExecRestrictedSQL(e.ctx, sql)
if err != nil {
return err
}
Expand Down Expand Up @@ -759,8 +776,32 @@ func (e *SimpleExec) executeGrantRole(s *ast.GrantRoleStmt) error {
}

func (e *SimpleExec) executeDropUser(s *ast.DropUserStmt) error {
// Check privileges.
// Check `CREATE USER` privilege.
if !config.GetGlobalConfig().Security.SkipGrantTable {
checker := privilege.GetPrivilegeManager(e.ctx)
if checker == nil {
return errors.New("miss privilege checker")
}
activeRoles := e.ctx.GetSessionVars().ActiveRoles
if !checker.RequestVerification(activeRoles, mysql.SystemDB, mysql.UserTable, "", mysql.DeletePriv) {
if s.IsDropRole && !checker.RequestVerification(activeRoles, "", "", "", mysql.DropRolePriv) {
return core.ErrSpecificAccessDenied.GenWithStackByArgs("DROP ROLE")
}
if !s.IsDropRole && !checker.RequestVerification(activeRoles, "", "", "", mysql.CreateUserPriv) {
return core.ErrSpecificAccessDenied.GenWithStackByArgs("CREATE USER")
}
}
}

failedUsers := make([]string, 0, len(s.UserList))
notExistUsers := make([]string, 0, len(s.UserList))
sysSession, err := e.getSysSession()
defer e.releaseSysSession(sysSession)
if err != nil {
return err
}
sqlExecutor := sysSession.(sqlexec.SQLExecutor)

for _, user := range s.UserList {
exists, err := userExists(e.ctx, user.Username, user.Hostname)
Expand All @@ -773,78 +814,78 @@ func (e *SimpleExec) executeDropUser(s *ast.DropUserStmt) error {
}

// begin a transaction to delete a user.
if _, err := e.ctx.(sqlexec.SQLExecutor).Execute(context.Background(), "begin"); err != nil {
if _, err := sqlExecutor.Execute(context.Background(), "begin"); err != nil {
return err
}
sql := fmt.Sprintf(`DELETE FROM %s.%s WHERE Host = '%s' and User = '%s';`, mysql.SystemDB, mysql.UserTable, user.Hostname, user.Username)
if _, err := e.ctx.(sqlexec.SQLExecutor).Execute(context.Background(), sql); err != nil {
if _, err := sqlExecutor.Execute(context.Background(), sql); err != nil {
failedUsers = append(failedUsers, user.String())
if _, err := e.ctx.(sqlexec.SQLExecutor).Execute(context.Background(), "rollback"); err != nil {
if _, err := sqlExecutor.Execute(context.Background(), "rollback"); err != nil {
return err
}
continue
}

// delete privileges from mysql.db
sql = fmt.Sprintf(`DELETE FROM %s.%s WHERE Host = '%s' and User = '%s';`, mysql.SystemDB, mysql.DBTable, user.Hostname, user.Username)
if _, err := e.ctx.(sqlexec.SQLExecutor).Execute(context.Background(), sql); err != nil {
if _, err := sqlExecutor.Execute(context.Background(), sql); err != nil {
failedUsers = append(failedUsers, user.String())
if _, err := e.ctx.(sqlexec.SQLExecutor).Execute(context.Background(), "rollback"); err != nil {
if _, err := sqlExecutor.Execute(context.Background(), "rollback"); err != nil {
return err
}
continue
}

// delete privileges from mysql.tables_priv
sql = fmt.Sprintf(`DELETE FROM %s.%s WHERE Host = '%s' and User = '%s';`, mysql.SystemDB, mysql.TablePrivTable, user.Hostname, user.Username)
if _, err := e.ctx.(sqlexec.SQLExecutor).Execute(context.Background(), sql); err != nil {
if _, err := sqlExecutor.Execute(context.Background(), sql); err != nil {
failedUsers = append(failedUsers, user.String())
if _, err := e.ctx.(sqlexec.SQLExecutor).Execute(context.Background(), "rollback"); err != nil {
if _, err := sqlExecutor.Execute(context.Background(), "rollback"); err != nil {
return err
}
continue
}

// delete relationship from mysql.role_edges
sql = fmt.Sprintf(`DELETE FROM %s.%s WHERE TO_HOST = '%s' and TO_USER = '%s';`, mysql.SystemDB, mysql.RoleEdgeTable, user.Hostname, user.Username)
if _, err := e.ctx.(sqlexec.SQLExecutor).Execute(context.Background(), sql); err != nil {
if _, err := sqlExecutor.Execute(context.Background(), sql); err != nil {
failedUsers = append(failedUsers, user.String())
if _, err := e.ctx.(sqlexec.SQLExecutor).Execute(context.Background(), "rollback"); err != nil {
if _, err := sqlExecutor.Execute(context.Background(), "rollback"); err != nil {
return err
}
continue
}

sql = fmt.Sprintf(`DELETE FROM %s.%s WHERE FROM_HOST = '%s' and FROM_USER = '%s';`, mysql.SystemDB, mysql.RoleEdgeTable, user.Hostname, user.Username)
if _, err := e.ctx.(sqlexec.SQLExecutor).Execute(context.Background(), sql); err != nil {
if _, err := sqlExecutor.Execute(context.Background(), sql); err != nil {
failedUsers = append(failedUsers, user.String())
if _, err := e.ctx.(sqlexec.SQLExecutor).Execute(context.Background(), "rollback"); err != nil {
if _, err := sqlExecutor.Execute(context.Background(), "rollback"); err != nil {
return err
}
continue
}

// delete relationship from mysql.default_roles
sql = fmt.Sprintf(`DELETE FROM %s.%s WHERE DEFAULT_ROLE_HOST = '%s' and DEFAULT_ROLE_USER = '%s';`, mysql.SystemDB, mysql.DefaultRoleTable, user.Hostname, user.Username)
if _, err := e.ctx.(sqlexec.SQLExecutor).Execute(context.Background(), sql); err != nil {
if _, err := sqlExecutor.Execute(context.Background(), sql); err != nil {
failedUsers = append(failedUsers, user.String())
if _, err := e.ctx.(sqlexec.SQLExecutor).Execute(context.Background(), "rollback"); err != nil {
if _, err := sqlExecutor.Execute(context.Background(), "rollback"); err != nil {
return err
}
continue
}

sql = fmt.Sprintf(`DELETE FROM %s.%s WHERE HOST = '%s' and USER = '%s';`, mysql.SystemDB, mysql.DefaultRoleTable, user.Hostname, user.Username)
if _, err := e.ctx.(sqlexec.SQLExecutor).Execute(context.Background(), sql); err != nil {
if _, err := sqlExecutor.Execute(context.Background(), sql); err != nil {
failedUsers = append(failedUsers, user.String())
if _, err := e.ctx.(sqlexec.SQLExecutor).Execute(context.Background(), "rollback"); err != nil {
if _, err := sqlExecutor.Execute(context.Background(), "rollback"); err != nil {
return err
}
continue
}

//TODO: need delete columns_priv once we implement columns_priv functionality.
if _, err := e.ctx.(sqlexec.SQLExecutor).Execute(context.Background(), "commit"); err != nil {
if _, err := sqlExecutor.Execute(context.Background(), "commit"); err != nil {
failedUsers = append(failedUsers, user.String())
}
}
Expand Down
36 changes: 36 additions & 0 deletions executor/simple_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -516,3 +516,39 @@ func (s *testSuite3) TestStmtAutoNewTxn(c *C) {
tk.MustExec("rollback")
tk.MustQuery("select * from auto_new").Check(testkit.Rows("1", "2"))
}

func (s *testSuite3) TestIssue9111(c *C) {
// CREATE USER / DROP USER fails if admin doesn't have insert privilege on `mysql.user` table.
tk := testkit.NewTestKit(c, s.store)
tk.MustExec("create user 'user_admin'@'localhost';")
tk.MustExec("grant create user on *.* to 'user_admin'@'localhost';")

// Create a new session.
se, err := session.CreateSession4Test(s.store)
c.Check(err, IsNil)
defer se.Close()
c.Assert(se.Auth(&auth.UserIdentity{Username: "user_admin", Hostname: "localhost"}, nil, nil), IsTrue)

ctx := context.Background()
_, err = se.Execute(ctx, `create user test_create_user`)
c.Check(err, IsNil)
_, err = se.Execute(ctx, `drop user test_create_user`)
c.Check(err, IsNil)

tk.MustExec("revoke create user on *.* from 'user_admin'@'localhost';")
tk.MustExec("grant insert, delete on mysql.User to 'user_admin'@'localhost';")

_, err = se.Execute(ctx, `flush privileges`)
c.Check(err, IsNil)
_, err = se.Execute(ctx, `create user test_create_user`)
c.Check(err, IsNil)
_, err = se.Execute(ctx, `drop user test_create_user`)
c.Check(err, IsNil)

_, err = se.Execute(ctx, `create role test_create_user`)
c.Check(err, IsNil)
_, err = se.Execute(ctx, `drop role test_create_user`)
c.Check(err, IsNil)

tk.MustExec("drop user 'user_admin'@'localhost';")
}
12 changes: 0 additions & 12 deletions planner/core/logical_plan_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1712,18 +1712,6 @@ func (s *testPlanSuite) TestVisitInfo(c *C) {
{mysql.IndexPriv, "test", "t", "", nil},
},
},
{
sql: `create user 'test'@'%' identified by '123456'`,
ans: []visitInfo{
{mysql.CreateUserPriv, "", "", "", ErrSpecificAccessDenied},
},
},
{
sql: `drop user 'test'@'%'`,
ans: []visitInfo{
{mysql.CreateUserPriv, "", "", "", ErrSpecificAccessDenied},
},
},
{
sql: `grant all privileges on test.* to 'test'@'%'`,
ans: []visitInfo{
Expand Down
16 changes: 0 additions & 16 deletions planner/core/planbuilder.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1309,22 +1309,6 @@ func (b *PlanBuilder) buildSimple(node ast.StmtNode) (Plan, error) {
p := &Simple{Statement: node}

switch raw := node.(type) {
case *ast.CreateUserStmt:
if raw.IsCreateRole {
err := ErrSpecificAccessDenied.GenWithStackByArgs("CREATE ROLE")
b.visitInfo = appendVisitInfo(b.visitInfo, mysql.CreateRolePriv, "", "", "", err)
} else {
err := ErrSpecificAccessDenied.GenWithStackByArgs("CREATE USER")
b.visitInfo = appendVisitInfo(b.visitInfo, mysql.CreateUserPriv, "", "", "", err)
}
case *ast.DropUserStmt:
if raw.IsDropRole {
err := ErrSpecificAccessDenied.GenWithStackByArgs("DROP ROLE")
b.visitInfo = appendVisitInfo(b.visitInfo, mysql.DropRolePriv, "", "", "", err)
} else {
err := ErrSpecificAccessDenied.GenWithStackByArgs("CREATE USER")
b.visitInfo = appendVisitInfo(b.visitInfo, mysql.CreateUserPriv, "", "", "", err)
}
case *ast.AlterUserStmt:
err := ErrSpecificAccessDenied.GenWithStackByArgs("CREATE USER")
b.visitInfo = appendVisitInfo(b.visitInfo, mysql.CreateUserPriv, "", "", "", err)
Expand Down