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path_config.go
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// Copyright © 2018 Immutability, LLC
//
// 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 main
import (
"context"
"fmt"
"github.com/hashicorp/errwrap"
"github.com/hashicorp/vault/sdk/framework"
"github.com/hashicorp/vault/sdk/helper/cidrutil"
"github.com/hashicorp/vault/sdk/logical"
)
type config struct {
BoundCIDRList []string `json:"bound_cidr_list_list" structs:"bound_cidr_list" mapstructure:"bound_cidr_list"`
}
func configPaths(b *PluginBackend) []*framework.Path {
return []*framework.Path{
&framework.Path{
Pattern: "config",
Callbacks: map[logical.Operation]framework.OperationFunc{
logical.CreateOperation: b.pathWriteConfig,
logical.UpdateOperation: b.pathWriteConfig,
logical.ReadOperation: b.pathReadConfig,
},
HelpSynopsis: "Configure the trustee plugin.",
HelpDescription: `
Configure the trustee plugin.
`,
Fields: map[string]*framework.FieldSchema{
"bound_cidr_list": &framework.FieldSchema{
Type: framework.TypeCommaStringSlice,
Description: `Comma separated string or list of CIDR blocks. If set, specifies the blocks of
IP addresses which can perform the login operation.`,
},
},
},
}
}
func (b *PluginBackend) pathWriteConfig(ctx context.Context, req *logical.Request, data *framework.FieldData) (*logical.Response, error) {
var boundCIDRList []string
if boundCIDRListRaw, ok := data.GetOk("bound_cidr_list"); ok {
boundCIDRList = boundCIDRListRaw.([]string)
}
configBundle := config{
BoundCIDRList: boundCIDRList,
}
entry, err := logical.StorageEntryJSON("config", configBundle)
if err != nil {
return nil, err
}
if err := req.Storage.Put(ctx, entry); err != nil {
return nil, err
}
// Return the secret
return &logical.Response{
Data: map[string]interface{}{
"bound_cidr_list": configBundle.BoundCIDRList,
},
}, nil
}
func (b *PluginBackend) pathReadConfig(ctx context.Context, req *logical.Request, data *framework.FieldData) (*logical.Response, error) {
configBundle, err := b.readConfig(ctx, req.Storage)
if err != nil {
return nil, err
}
if configBundle == nil {
return nil, nil
}
// Return the secret
return &logical.Response{
Data: map[string]interface{}{
"bound_cidr_list": configBundle.BoundCIDRList,
},
}, nil
}
// Config returns the configuration for this backend.
func (b *PluginBackend) readConfig(ctx context.Context, s logical.Storage) (*config, error) {
entry, err := s.Get(ctx, "config")
if err != nil {
return nil, err
}
if entry == nil {
return nil, fmt.Errorf("the trustee backend is not configured properly")
}
var result config
if entry != nil {
if err := entry.DecodeJSON(&result); err != nil {
return nil, fmt.Errorf("error reading configuration: %s", err)
}
}
return &result, nil
}
func (b *PluginBackend) configured(ctx context.Context, req *logical.Request) (*config, error) {
config, err := b.readConfig(ctx, req.Storage)
if err != nil {
return nil, err
}
if validConnection, err := b.validIPConstraints(config, req); !validConnection {
return nil, err
}
return config, nil
}
func (b *PluginBackend) validIPConstraints(config *config, req *logical.Request) (bool, error) {
if len(config.BoundCIDRList) != 0 {
if req.Connection == nil || req.Connection.RemoteAddr == "" {
return false, fmt.Errorf("failed to get connection information")
}
belongs, err := cidrutil.IPBelongsToCIDRBlocksSlice(req.Connection.RemoteAddr, config.BoundCIDRList)
if err != nil {
return false, errwrap.Wrapf("failed to verify the CIDR restrictions set on the role: {{err}}", err)
}
if !belongs {
return false, fmt.Errorf("source address %q unauthorized through CIDR restrictions on the role", req.Connection.RemoteAddr)
}
}
return true, nil
}