forked from TrueCloudLab/certificates
73 lines
1.6 KiB
Go
73 lines
1.6 KiB
Go
package acme
|
|
|
|
import (
|
|
"encoding/base64"
|
|
"encoding/json"
|
|
"time"
|
|
|
|
"github.com/pkg/errors"
|
|
"github.com/smallstep/nosql"
|
|
"github.com/smallstep/nosql/database"
|
|
)
|
|
|
|
// nonce contains nonce metadata used in the ACME protocol.
|
|
type nonce struct {
|
|
ID string
|
|
Created time.Time
|
|
}
|
|
|
|
// newNonce creates, stores, and returns an ACME replay-nonce.
|
|
func newNonce(db nosql.DB) (*nonce, error) {
|
|
_id, err := randID()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
id := base64.RawURLEncoding.EncodeToString([]byte(_id))
|
|
n := &nonce{
|
|
ID: id,
|
|
Created: clock.Now(),
|
|
}
|
|
b, err := json.Marshal(n)
|
|
if err != nil {
|
|
return nil, ServerInternalErr(errors.Wrap(err, "error marshaling nonce"))
|
|
}
|
|
_, swapped, err := db.CmpAndSwap(nonceTable, []byte(id), nil, b)
|
|
switch {
|
|
case err != nil:
|
|
return nil, ServerInternalErr(errors.Wrap(err, "error storing nonce"))
|
|
case !swapped:
|
|
return nil, ServerInternalErr(errors.New("error storing nonce; " +
|
|
"value has changed since last read"))
|
|
default:
|
|
return n, nil
|
|
}
|
|
}
|
|
|
|
// useNonce verifies that the nonce is valid (by checking if it exists),
|
|
// and if so, consumes the nonce resource by deleting it from the database.
|
|
func useNonce(db nosql.DB, nonce string) error {
|
|
err := db.Update(&database.Tx{
|
|
Operations: []*database.TxEntry{
|
|
{
|
|
Bucket: nonceTable,
|
|
Key: []byte(nonce),
|
|
Cmd: database.Get,
|
|
},
|
|
{
|
|
Bucket: nonceTable,
|
|
Key: []byte(nonce),
|
|
Cmd: database.Delete,
|
|
},
|
|
},
|
|
})
|
|
|
|
switch {
|
|
case nosql.IsErrNotFound(err):
|
|
return BadNonceErr(nil)
|
|
case err != nil:
|
|
return ServerInternalErr(errors.Wrapf(err, "error deleting nonce %s", nonce))
|
|
default:
|
|
return nil
|
|
}
|
|
}
|