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auth.go
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auth.go
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// Copyright 2020-2021 Dolthub, 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,
// 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 auth
import (
"strings"
"github.com/dolthub/vitess/go/mysql"
"gopkg.in/src-d/go-errors.v1"
"github.com/Sndav/go-mysql-server/sql"
)
// Permission holds permissions required by a query or grated to a user.
type Permission int
const (
// ReadPerm means that it reads.
ReadPerm Permission = 1 << iota
// WritePerm means that it writes.
WritePerm
)
var (
// AllPermissions hold all defined permissions.
AllPermissions = ReadPerm | WritePerm
// DefaultPermissions are the permissions granted to a user if not defined.
DefaultPermissions = ReadPerm
// PermissionNames is used to translate from human to machine
// representations.
PermissionNames = map[string]Permission{
"read": ReadPerm,
"write": WritePerm,
}
// ErrNotAuthorized is returned when the user is not allowed to use a
// permission.
ErrNotAuthorized = errors.NewKind("not authorized")
// ErrNoPermission is returned when the user lacks needed permissions.
ErrNoPermission = errors.NewKind("user does not have permission: %s")
)
// String returns all the permissions set to on.
func (p Permission) String() string {
var str []string
for k, v := range PermissionNames {
if p&v != 0 {
str = append(str, k)
}
}
return strings.Join(str, ", ")
}
// Auth interface provides mysql authentication methods and permission checking
// for users.
type Auth interface {
// Mysql returns a configured authentication method used by server.Server.
Mysql() mysql.AuthServer
// Allowed checks user's permissions with needed permission. If the user
// does not have enough permissions it returns ErrNotAuthorized.
// Otherwise is an error using the authentication method.
Allowed(ctx *sql.Context, permission Permission) error
}