open-vault/builtin/logical/aws/path_config_root.go

package aws

import (
	"context"

	"github.com/aws/aws-sdk-go/aws"
	"github.com/hashicorp/vault/sdk/framework"
	"github.com/hashicorp/vault/sdk/logical"
)

func pathConfigRoot(b *backend) *framework.Path {
	return &framework.Path{
		Pattern: "config/root",
		Fields: map[string]*framework.FieldSchema{
			"access_key": {
				Type:        framework.TypeString,
				Description: "Access key with permission to create new keys.",
			},

			"secret_key": {
				Type:        framework.TypeString,
				Description: "Secret key with permission to create new keys.",
			},

			"region": {
				Type:        framework.TypeString,
				Description: "Region for API calls.",
			},
			"iam_endpoint": {
				Type:        framework.TypeString,
				Description: "Endpoint to custom IAM server URL",
			},
			"sts_endpoint": {
				Type:        framework.TypeString,
				Description: "Endpoint to custom STS server URL",
			},
			"max_retries": {
				Type:        framework.TypeInt,
				Default:     aws.UseServiceDefaultRetries,
				Description: "Maximum number of retries for recoverable exceptions of AWS APIs",
			},
		},

		Callbacks: map[logical.Operation]framework.OperationFunc{
			logical.ReadOperation:   b.pathConfigRootRead,
			logical.UpdateOperation: b.pathConfigRootWrite,
		},

		HelpSynopsis:    pathConfigRootHelpSyn,
		HelpDescription: pathConfigRootHelpDesc,
	}
}

func (b *backend) pathConfigRootRead(ctx context.Context, req *logical.Request, data *framework.FieldData) (*logical.Response, error) {
	b.clientMutex.RLock()
	defer b.clientMutex.RUnlock()

	entry, err := req.Storage.Get(ctx, "config/root")
	if err != nil {
		return nil, err
	}
	if entry == nil {
		return nil, nil
	}

	var config rootConfig

	if err := entry.DecodeJSON(&config); err != nil {
		return nil, err
	}

	configData := map[string]interface{}{
		"access_key":   config.AccessKey,
		"region":       config.Region,
		"iam_endpoint": config.IAMEndpoint,
		"sts_endpoint": config.STSEndpoint,
		"max_retries":  config.MaxRetries,
	}
	return &logical.Response{
		Data: configData,
	}, nil
}

func (b *backend) pathConfigRootWrite(ctx context.Context, req *logical.Request, data *framework.FieldData) (*logical.Response, error) {
	region := data.Get("region").(string)
	iamendpoint := data.Get("iam_endpoint").(string)
	stsendpoint := data.Get("sts_endpoint").(string)
	maxretries := data.Get("max_retries").(int)

	b.clientMutex.Lock()
	defer b.clientMutex.Unlock()

	entry, err := logical.StorageEntryJSON("config/root", rootConfig{
		AccessKey:   data.Get("access_key").(string),
		SecretKey:   data.Get("secret_key").(string),
		IAMEndpoint: iamendpoint,
		STSEndpoint: stsendpoint,
		Region:      region,
		MaxRetries:  maxretries,
	})
	if err != nil {
		return nil, err
	}

	if err := req.Storage.Put(ctx, entry); err != nil {
		return nil, err
	}

	// clear possible cached IAM / STS clients after successfully updating
	// config/root
	b.iamClient = nil
	b.stsClient = nil

	return nil, nil
}

type rootConfig struct {
	AccessKey   string `json:"access_key"`
	SecretKey   string `json:"secret_key"`
	IAMEndpoint string `json:"iam_endpoint"`
	STSEndpoint string `json:"sts_endpoint"`
	Region      string `json:"region"`
	MaxRetries  int    `json:"max_retries"`
}

const pathConfigRootHelpSyn = `
Configure the root credentials that are used to manage IAM.
`

const pathConfigRootHelpDesc = `
Before doing anything, the AWS backend needs credentials that are able
to manage IAM policies, users, access keys, etc. This endpoint is used
to configure those credentials. They don't necessarily need to be root
keys as long as they have permission to manage IAM.
`