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backend.go
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backend.go
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package nebula
import (
"context"
"crypto/rand"
"fmt"
"net"
"strings"
"time"
"github.com/hashicorp/vault/sdk/framework"
"github.com/hashicorp/vault/sdk/helper/errutil"
"github.com/hashicorp/vault/sdk/logical"
"github.com/slackhq/nebula/cert"
"golang.org/x/crypto/ed25519"
)
type backend struct {
*framework.Backend
storage logical.Storage
}
func Factory(ctx context.Context, conf *logical.BackendConfig) (logical.Backend, error) {
b, err := Backend()
if err != nil {
return nil, err
}
if conf == nil {
return nil, fmt.Errorf("configuration passed into backend is nil")
}
if err := b.Setup(ctx, conf); err != nil {
return nil, err
}
return b, nil
}
func Backend() (*backend, error) {
var b backend
b.Backend = &framework.Backend{
Help: strings.TrimSpace(backendHelp),
BackendType: logical.TypeLogical,
Paths: []*framework.Path{
pathConfigCA(&b),
},
}
return &b, nil
}
func pathConfigCA(b *backend) *framework.Path {
return &framework.Path{
Pattern: "config/ca",
Fields: map[string]*framework.FieldSchema{
"name": {
Type: framework.TypeString,
Description: `Required: name of the certificate authority`,
},
"duration": {
Type: framework.TypeString,
Description: `Optional: amount of time the certificate should be valid for. Valid time units are seconds: "s", minutes: "m", hours: "h" (default 8760h0m0s)`,
Default: "8760h",
},
"groups": {
Type: framework.TypeString,
Description: `Optional: list of groups. This will limit which groups subordinate certs can use.`,
Default: "",
},
"ips": {
Type: framework.TypeString,
Description: `Optional: list of ip and network in CIDR notation. This will limit which ip addresses and networks subordinate certs can use.`,
Default: "",
},
"subnets": {
Type: framework.TypeString,
Description: `Optional: list of ip and network in CIDR notation. This will limit which subnet addresses and networks subordinate certs can use.`,
Default: "",
},
},
Operations: map[logical.Operation]framework.OperationHandler{
logical.UpdateOperation: &framework.PathOperation{
Callback: b.pathConfigCAUpdate,
Summary: "",
},
logical.DeleteOperation: &framework.PathOperation{
Callback: b.pathConfigCADelete,
Summary: "",
},
logical.ReadOperation: &framework.PathOperation{
Callback: b.pathConfigCARead,
Summary: "",
},
},
}
}
func (b *backend) pathConfigCAUpdate(ctx context.Context, req *logical.Request, data *framework.FieldData) (*logical.Response, error) {
name := data.Get("name").(string)
if name == "" {
return nil, fmt.Errorf("Nebula CA Name may not be empty")
}
groups := data.Get("groups").(string)
var _groups []string
if groups != "" {
for _, rg := range strings.Split(groups, ",") {
g := strings.TrimSpace(rg)
if g != "" {
_groups = append(_groups, g)
}
}
}
duration := data.Get("duration").(string)
var _duration time.Duration
_duration, err := time.ParseDuration(duration)
if err != nil {
return nil, fmt.Errorf("Invalid time format: %s", err)
}
ips := data.Get("ips").(string)
var _ips []*net.IPNet
if ips != "" {
for _, rs := range strings.Split(ips, ",") {
rs := strings.Trim(rs, " ")
if rs != "" {
ip, ipNet, err := net.ParseCIDR(rs)
if err != nil {
return nil, fmt.Errorf("invalid ip definition: %s", err)
}
ipNet.IP = ip
_ips = append(_ips, ipNet)
}
}
}
subnets := data.Get("subnets").(string)
var _subnets []*net.IPNet
if subnets != "" {
for _, rs := range strings.Split(subnets, ",") {
rs := strings.Trim(rs, " ")
if rs != "" {
_, s, err := net.ParseCIDR(rs)
if err != nil {
return nil, fmt.Errorf("invalid subnet definition: %s", err)
}
_subnets = append(_subnets, s)
}
}
}
publicKey, privateKey, err := ed25519.GenerateKey(rand.Reader)
nc := cert.NebulaCertificate{
Details: cert.NebulaCertificateDetails{
Name: name,
Groups: _groups,
Ips: _ips,
Subnets: _subnets,
NotBefore: time.Now(),
NotAfter: time.Now().Add(_duration),
PublicKey: publicKey,
IsCA: true,
},
}
entry, err := logical.StorageEntryJSON("config/ca_cert", nc)
if err != nil {
return nil, err
}
err = req.Storage.Put(ctx, entry)
if err != nil {
return nil, err
}
entry, err = logical.StorageEntryJSON("config/ca_key", privateKey)
if err != nil {
return nil, err
}
err = req.Storage.Put(ctx, entry)
if err != nil {
return nil, err
}
return nil, err
}
func (b *backend) pathConfigCARead(ctx context.Context, req *logical.Request, data *framework.FieldData) (*logical.Response, error) {
nebulaCACertEntry, err := req.Storage.Get(ctx, "config/ca_cert")
if err != nil {
return nil, errutil.InternalError{Err: fmt.Sprintf("unable to fetch nebula ca: %v", err)}
}
var nc cert.NebulaCertificate
if err := nebulaCACertEntry.DecodeJSON(&nc); err != nil {
return nil, errutil.InternalError{Err: fmt.Sprintf("unable to decode Nebula Certificate: %v", err)}
}
certDetails := nc.Details
resp := &logical.Response{
Data: map[string]interface{}{
"name": certDetails.Name,
"public_key": certDetails.PublicKey,
},
}
return resp, nil
}
func (b *backend) pathConfigCADelete(ctx context.Context, req *logical.Request, data *framework.FieldData) (*logical.Response, error) {
return nil, nil
}
const backendHelp = `
The Nebula backend generates Nebula style Curve25519 certs.
`