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backend.go
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backend.go
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package cert
import (
"context"
"crypto/x509"
"fmt"
"io"
"net/http"
"strings"
"sync"
"time"
"github.com/hashicorp/go-multierror"
"github.com/hashicorp/vault/sdk/framework"
"github.com/hashicorp/vault/sdk/logical"
)
func Factory(ctx context.Context, conf *logical.BackendConfig) (logical.Backend, error) {
b := Backend()
if err := b.Setup(ctx, conf); err != nil {
return nil, err
}
if err := b.lockThenpopulateCRLs(ctx, conf.StorageView); err != nil {
return nil, err
}
return b, nil
}
func Backend() *backend {
var b backend
b.Backend = &framework.Backend{
Help: backendHelp,
PathsSpecial: &logical.Paths{
Unauthenticated: []string{
"login",
},
},
Paths: []*framework.Path{
pathConfig(&b),
pathLogin(&b),
pathListCerts(&b),
pathCerts(&b),
pathCRLs(&b),
},
AuthRenew: b.loginPathWrapper(b.pathLoginRenew),
Invalidate: b.invalidate,
BackendType: logical.TypeCredential,
PeriodicFunc: b.updateCRLs,
}
b.crlUpdateMutex = &sync.RWMutex{}
return &b
}
type backend struct {
*framework.Backend
MapCertId *framework.PathMap
crls map[string]CRLInfo
crlUpdateMutex *sync.RWMutex
}
func (b *backend) invalidate(_ context.Context, key string) {
switch {
case strings.HasPrefix(key, "crls/"):
b.crlUpdateMutex.Lock()
defer b.crlUpdateMutex.Unlock()
b.crls = nil
}
}
func (b *backend) fetchCRL(ctx context.Context, storage logical.Storage, name string, crl *CRLInfo) error {
response, err := http.Get(crl.CDP.Url)
if err != nil {
return err
}
if response.StatusCode == http.StatusOK {
body, err := io.ReadAll(response.Body)
if err != nil {
return err
}
certList, err := x509.ParseCRL(body)
if err != nil {
return err
}
crl.CDP.ValidUntil = certList.TBSCertList.NextUpdate
return b.setCRL(ctx, storage, certList, name, crl.CDP)
}
return fmt.Errorf("unexpected response code %d fetching CRL from %s", response.StatusCode, crl.CDP.Url)
}
func (b *backend) updateCRLs(ctx context.Context, req *logical.Request) error {
b.crlUpdateMutex.Lock()
defer b.crlUpdateMutex.Unlock()
var errs *multierror.Error
for name, crl := range b.crls {
if crl.CDP != nil && time.Now().After(crl.CDP.ValidUntil) {
if err := b.fetchCRL(ctx, req.Storage, name, &crl); err != nil {
errs = multierror.Append(errs, err)
}
}
}
return errs.ErrorOrNil()
}
const backendHelp = `
The "cert" credential provider allows authentication using
TLS client certificates. A client connects to Vault and uses
the "login" endpoint to generate a client token.
Trusted certificates are configured using the "certs/" endpoint
by a user with root access. A certificate authority can be trusted,
which permits all keys signed by it. Alternatively, self-signed
certificates can be trusted avoiding the need for a CA.
`