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gitea/vendor/github.com/pingcap/tidb/privilege/privileges/privileges.go

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// Copyright 2015 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package privileges
import (
"fmt"
"strings"
"github.com/juju/errors"
"github.com/pingcap/tidb/ast"
"github.com/pingcap/tidb/context"
"github.com/pingcap/tidb/model"
"github.com/pingcap/tidb/mysql"
"github.com/pingcap/tidb/privilege"
"github.com/pingcap/tidb/sessionctx/variable"
"github.com/pingcap/tidb/util/sqlexec"
"github.com/pingcap/tidb/util/types"
)
var _ privilege.Checker = (*UserPrivileges)(nil)
type privileges struct {
Level ast.GrantLevelType
privs map[mysql.PrivilegeType]bool
}
func (ps *privileges) contain(p mysql.PrivilegeType) bool {
if ps.privs == nil {
return false
}
_, ok := ps.privs[p]
return ok
}
func (ps *privileges) add(p mysql.PrivilegeType) {
if ps.privs == nil {
ps.privs = make(map[mysql.PrivilegeType]bool)
}
ps.privs[p] = true
}
func (ps *privileges) String() string {
switch ps.Level {
case ast.GrantLevelGlobal:
return ps.globalPrivToString()
case ast.GrantLevelDB:
return ps.dbPrivToString()
case ast.GrantLevelTable:
return ps.tablePrivToString()
}
return ""
}
func (ps *privileges) globalPrivToString() string {
if len(ps.privs) == len(mysql.AllGlobalPrivs) {
return mysql.AllPrivilegeLiteral
}
pstrs := make([]string, 0, len(ps.privs))
// Iterate AllGlobalPrivs to get stable order result.
for _, p := range mysql.AllGlobalPrivs {
_, ok := ps.privs[p]
if !ok {
continue
}
s, _ := mysql.Priv2Str[p]
pstrs = append(pstrs, s)
}
return strings.Join(pstrs, ",")
}
func (ps *privileges) dbPrivToString() string {
if len(ps.privs) == len(mysql.AllDBPrivs) {
return mysql.AllPrivilegeLiteral
}
pstrs := make([]string, 0, len(ps.privs))
// Iterate AllDBPrivs to get stable order result.
for _, p := range mysql.AllDBPrivs {
_, ok := ps.privs[p]
if !ok {
continue
}
s, _ := mysql.Priv2SetStr[p]
pstrs = append(pstrs, s)
}
return strings.Join(pstrs, ",")
}
func (ps *privileges) tablePrivToString() string {
if len(ps.privs) == len(mysql.AllTablePrivs) {
return mysql.AllPrivilegeLiteral
}
pstrs := make([]string, 0, len(ps.privs))
// Iterate AllTablePrivs to get stable order result.
for _, p := range mysql.AllTablePrivs {
_, ok := ps.privs[p]
if !ok {
continue
}
s, _ := mysql.Priv2Str[p]
pstrs = append(pstrs, s)
}
return strings.Join(pstrs, ",")
}
type userPrivileges struct {
User string
Host string
// Global privileges
GlobalPrivs *privileges
// DBName-privileges
DBPrivs map[string]*privileges
// DBName-TableName-privileges
TablePrivs map[string]map[string]*privileges
}
func (ps *userPrivileges) ShowGrants() []string {
gs := []string{}
// Show global grants
g := ps.GlobalPrivs.String()
if len(g) > 0 {
s := fmt.Sprintf(`GRANT %s ON *.* TO '%s'@'%s'`, g, ps.User, ps.Host)
gs = append(gs, s)
}
// Show db scope grants
for d, p := range ps.DBPrivs {
g := p.String()
if len(g) > 0 {
s := fmt.Sprintf(`GRANT %s ON %s.* TO '%s'@'%s'`, g, d, ps.User, ps.Host)
gs = append(gs, s)
}
}
// Show table scope grants
for d, dps := range ps.TablePrivs {
for t, p := range dps {
g := p.String()
if len(g) > 0 {
s := fmt.Sprintf(`GRANT %s ON %s.%s TO '%s'@'%s'`, g, d, t, ps.User, ps.Host)
gs = append(gs, s)
}
}
}
return gs
}
// UserPrivileges implements privilege.Checker interface.
// This is used to check privilege for the current user.
type UserPrivileges struct {
User string
privs *userPrivileges
}
// Check implements Checker.Check interface.
func (p *UserPrivileges) Check(ctx context.Context, db *model.DBInfo, tbl *model.TableInfo, privilege mysql.PrivilegeType) (bool, error) {
if p.privs == nil {
// Lazy load
if len(p.User) == 0 {
// User current user
p.User = variable.GetSessionVars(ctx).User
if len(p.User) == 0 {
// In embedded db mode, user does not need to login. So we do not have username.
// TODO: remove this check latter.
return true, nil
}
}
err := p.loadPrivileges(ctx)
if err != nil {
return false, errors.Trace(err)
}
}
// Check global scope privileges.
ok := p.privs.GlobalPrivs.contain(privilege)
if ok {
return true, nil
}
// Check db scope privileges.
dbp, ok := p.privs.DBPrivs[db.Name.O]
if ok {
ok = dbp.contain(privilege)
if ok {
return true, nil
}
}
if tbl == nil {
return false, nil
}
// Check table scope privileges.
dbTbl, ok := p.privs.TablePrivs[db.Name.O]
if !ok {
return false, nil
}
tblp, ok := dbTbl[tbl.Name.O]
if !ok {
return false, nil
}
return tblp.contain(privilege), nil
}
func (p *UserPrivileges) loadPrivileges(ctx context.Context) error {
strs := strings.Split(p.User, "@")
if len(strs) != 2 {
return errors.Errorf("Wrong username format: %s", p.User)
}
username, host := strs[0], strs[1]
p.privs = &userPrivileges{
User: username,
Host: host,
}
// Load privileges from mysql.User/DB/Table_privs/Column_privs table
err := p.loadGlobalPrivileges(ctx)
if err != nil {
return errors.Trace(err)
}
err = p.loadDBScopePrivileges(ctx)
if err != nil {
return errors.Trace(err)
}
err = p.loadTableScopePrivileges(ctx)
if err != nil {
return errors.Trace(err)
}
// TODO: consider column scope privilege latter.
return nil
}
// mysql.User/mysql.DB table privilege columns start from index 3.
// See: booststrap.go CreateUserTable/CreateDBPrivTable
const userTablePrivColumnStartIndex = 3
const dbTablePrivColumnStartIndex = 3
func (p *UserPrivileges) loadGlobalPrivileges(ctx context.Context) error {
sql := fmt.Sprintf(`SELECT * FROM %s.%s WHERE User="%s" AND (Host="%s" OR Host="%%");`,
mysql.SystemDB, mysql.UserTable, p.privs.User, p.privs.Host)
rs, err := ctx.(sqlexec.RestrictedSQLExecutor).ExecRestrictedSQL(ctx, sql)
if err != nil {
return errors.Trace(err)
}
defer rs.Close()
ps := &privileges{Level: ast.GrantLevelGlobal}
fs, err := rs.Fields()
if err != nil {
return errors.Trace(err)
}
for {
row, err := rs.Next()
if err != nil {
return errors.Trace(err)
}
if row == nil {
break
}
for i := userTablePrivColumnStartIndex; i < len(fs); i++ {
d := row.Data[i]
if d.Kind() != types.KindMysqlEnum {
return errors.Errorf("Privilege should be mysql.Enum: %v(%T)", d, d)
}
ed := d.GetMysqlEnum()
if ed.String() != "Y" {
continue
}
f := fs[i]
p, ok := mysql.Col2PrivType[f.ColumnAsName.O]
if !ok {
return errors.New("Unknown Privilege Type!")
}
ps.add(p)
}
}
p.privs.GlobalPrivs = ps
return nil
}
func (p *UserPrivileges) loadDBScopePrivileges(ctx context.Context) error {
sql := fmt.Sprintf(`SELECT * FROM %s.%s WHERE User="%s" AND (Host="%s" OR Host="%%");`,
mysql.SystemDB, mysql.DBTable, p.privs.User, p.privs.Host)
rs, err := ctx.(sqlexec.RestrictedSQLExecutor).ExecRestrictedSQL(ctx, sql)
if err != nil {
return errors.Trace(err)
}
defer rs.Close()
ps := make(map[string]*privileges)
fs, err := rs.Fields()
if err != nil {
return errors.Trace(err)
}
for {
row, err := rs.Next()
if err != nil {
return errors.Trace(err)
}
if row == nil {
break
}
// DB
dbStr := row.Data[1].GetString()
ps[dbStr] = &privileges{Level: ast.GrantLevelDB}
for i := dbTablePrivColumnStartIndex; i < len(fs); i++ {
d := row.Data[i]
if d.Kind() != types.KindMysqlEnum {
return errors.Errorf("Privilege should be mysql.Enum: %v(%T)", d, d)
}
ed := d.GetMysqlEnum()
if ed.String() != "Y" {
continue
}
f := fs[i]
p, ok := mysql.Col2PrivType[f.ColumnAsName.O]
if !ok {
return errors.New("Unknown Privilege Type!")
}
ps[dbStr].add(p)
}
}
p.privs.DBPrivs = ps
return nil
}
func (p *UserPrivileges) loadTableScopePrivileges(ctx context.Context) error {
sql := fmt.Sprintf(`SELECT * FROM %s.%s WHERE User="%s" AND (Host="%s" OR Host="%%");`,
mysql.SystemDB, mysql.TablePrivTable, p.privs.User, p.privs.Host)
rs, err := ctx.(sqlexec.RestrictedSQLExecutor).ExecRestrictedSQL(ctx, sql)
if err != nil {
return errors.Trace(err)
}
defer rs.Close()
ps := make(map[string]map[string]*privileges)
for {
row, err := rs.Next()
if err != nil {
return errors.Trace(err)
}
if row == nil {
break
}
// DB
dbStr := row.Data[1].GetString()
// Table_name
tblStr := row.Data[3].GetString()
_, ok := ps[dbStr]
if !ok {
ps[dbStr] = make(map[string]*privileges)
}
ps[dbStr][tblStr] = &privileges{Level: ast.GrantLevelTable}
// Table_priv
tblPrivs := row.Data[6].GetMysqlSet()
pvs := strings.Split(tblPrivs.Name, ",")
for _, d := range pvs {
p, ok := mysql.SetStr2Priv[d]
if !ok {
return errors.New("Unknown Privilege Type!")
}
ps[dbStr][tblStr].add(p)
}
}
p.privs.TablePrivs = ps
return nil
}
// ShowGrants implements privilege.Checker ShowGrants interface.
func (p *UserPrivileges) ShowGrants(ctx context.Context, user string) ([]string, error) {
// If user is current user
if user == p.User {
return p.privs.ShowGrants(), nil
}
userp := &UserPrivileges{User: user}
err := userp.loadPrivileges(ctx)
if err != nil {
return nil, errors.Trace(err)
}
return userp.privs.ShowGrants(), nil
}