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grant.go
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grant.go
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// Copyright 2015 The Cockroach Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License.
package sql
import (
"golang.org/x/net/context"
"github.com/cockroachdb/cockroach/pkg/sql/parser"
"github.com/cockroachdb/cockroach/pkg/sql/privilege"
"github.com/cockroachdb/cockroach/pkg/sql/sqlbase"
)
func (p *planner) changePrivileges(
ctx context.Context,
targets parser.TargetList,
grantees parser.NameList,
changePrivilege func(*sqlbase.PrivilegeDescriptor, string),
) (planNode, error) {
descriptors, err := getDescriptorsFromTargetList(ctx, p.txn, p.getVirtualTabler(), p.session.Database, targets)
if err != nil {
return nil, err
}
for _, descriptor := range descriptors {
if err := p.CheckPrivilege(descriptor, privilege.GRANT); err != nil {
return nil, err
}
privileges := descriptor.GetPrivileges()
for _, grantee := range grantees {
changePrivilege(privileges, string(grantee))
}
switch d := descriptor.(type) {
case *sqlbase.DatabaseDescriptor:
if err := d.Validate(); err != nil {
return nil, err
}
case *sqlbase.TableDescriptor:
if err := d.Validate(ctx, p.txn); err != nil {
return nil, err
}
if err := d.SetUpVersion(); err != nil {
return nil, err
}
p.notifySchemaChange(d, sqlbase.InvalidMutationID)
}
}
// Now update the descriptors transactionally.
b := p.txn.NewBatch()
for _, descriptor := range descriptors {
descKey := sqlbase.MakeDescMetadataKey(descriptor.GetID())
b.Put(descKey, sqlbase.WrapDescriptor(descriptor))
}
if err := p.txn.Run(ctx, b); err != nil {
return nil, err
}
return &zeroNode{}, nil
}
// Grant adds privileges to users.
// Current status:
// - Target: single database, table, or view.
// TODO(marc): open questions:
// - should we have root always allowed and not present in the permissions list?
// - should we make users case-insensitive?
// Privileges: GRANT on database/table/view.
// Notes: postgres requires the object owner.
// mysql requires the "grant option" and the same privileges, and sometimes superuser.
func (p *planner) Grant(ctx context.Context, n *parser.Grant) (planNode, error) {
return p.changePrivileges(ctx, n.Targets, n.Grantees, func(privDesc *sqlbase.PrivilegeDescriptor, grantee string) {
privDesc.Grant(grantee, n.Privileges)
})
}
// Revoke removes privileges from users.
// Current status:
// - Target: single database, table, or view.
// TODO(marc): open questions:
// - should we have root always allowed and not present in the permissions list?
// - should we make users case-insensitive?
// Privileges: GRANT on database/table/view.
// Notes: postgres requires the object owner.
// mysql requires the "grant option" and the same privileges, and sometimes superuser.
func (p *planner) Revoke(ctx context.Context, n *parser.Revoke) (planNode, error) {
return p.changePrivileges(ctx, n.Targets, n.Grantees, func(privDesc *sqlbase.PrivilegeDescriptor, grantee string) {
privDesc.Revoke(grantee, n.Privileges)
})
}