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package scepserver
import (
"bytes"
"context"
"net/url"
"strings"
"sync"
"time"
"github.com/go-kit/kit/endpoint"
"github.com/go-kit/kit/log"
httptransport "github.com/go-kit/kit/transport/http"
"github.com/pkg/errors"
)
// possible SCEP operations
const (
getCACaps = "GetCACaps"
getCACert = "GetCACert"
pkiOperation = "PKIOperation"
getNextCACert = "GetNextCACert"
)
type Endpoints struct {
GetEndpoint endpoint.Endpoint
PostEndpoint endpoint.Endpoint
mtx sync.RWMutex
capabilities []byte
}
func (e *Endpoints) GetCACaps(ctx context.Context) ([]byte, error) {
request := SCEPRequest{Operation: getCACaps}
response, err := e.GetEndpoint(ctx, request)
if err != nil {
return nil, err
}
resp := response.(SCEPResponse)
e.mtx.Lock()
e.capabilities = resp.Data
e.mtx.Unlock()
return resp.Data, resp.Err
}
func (e *Endpoints) Supports(cap string) bool {
e.mtx.RLock()
defer e.mtx.RUnlock()
if len(e.capabilities) == 0 {
e.mtx.RUnlock()
e.GetCACaps(context.Background())
e.mtx.RLock()
}
return bytes.Contains(e.capabilities, []byte(cap))
}
func (e *Endpoints) GetCACert(ctx context.Context, message string) ([]byte, int, error) {
request := SCEPRequest{Operation: getCACert, Message: []byte(message)}
response, err := e.GetEndpoint(ctx, request)
if err != nil {
return nil, 0, err
}
resp := response.(SCEPResponse)
return resp.Data, resp.CACertNum, resp.Err
}
func (e *Endpoints) PKIOperation(ctx context.Context, msg []byte) ([]byte, error) {
var ee endpoint.Endpoint
if e.Supports("POSTPKIOperation") || e.Supports("SCEPStandard") {
ee = e.PostEndpoint
} else {
ee = e.GetEndpoint
}
request := SCEPRequest{Operation: pkiOperation, Message: msg}
response, err := ee(ctx, request)
if err != nil {
return nil, err
}
resp := response.(SCEPResponse)
return resp.Data, resp.Err
}
func (e *Endpoints) GetNextCACert(ctx context.Context) ([]byte, error) {
var request SCEPRequest
response, err := e.GetEndpoint(ctx, request)
if err != nil {
return nil, err
}
resp := response.(SCEPResponse)
return resp.Data, resp.Err
}
func MakeServerEndpoints(svc Service) *Endpoints {
e := MakeSCEPEndpoint(svc)
return &Endpoints{
GetEndpoint: e,
PostEndpoint: e,
}
}
// MakeClientEndpoints returns an Endpoints struct where each endpoint invokes
// the corresponding method on the remote instance, via a transport/http.Client.
// Useful in a SCEP client.
func MakeClientEndpoints(instance string) (*Endpoints, error) {
if !strings.HasPrefix(instance, "http") {
instance = "http://" + instance
}
tgt, err := url.Parse(instance)
if err != nil {
return nil, err
}
options := []httptransport.ClientOption{}
return &Endpoints{
GetEndpoint: httptransport.NewClient(
"GET",
tgt,
EncodeSCEPRequest,
DecodeSCEPResponse,
options...).Endpoint(),
PostEndpoint: httptransport.NewClient(
"POST",
tgt,
EncodeSCEPRequest,
DecodeSCEPResponse,
options...).Endpoint(),
}, nil
}
func MakeSCEPEndpoint(svc Service) endpoint.Endpoint {
return func(ctx context.Context, request interface{}) (interface{}, error) {
req := request.(SCEPRequest)
resp := SCEPResponse{operation: req.Operation}
switch req.Operation {
case "GetCACaps":
resp.Data, resp.Err = svc.GetCACaps(ctx)
case "GetCACert":
resp.Data, resp.CACertNum, resp.Err = svc.GetCACert(ctx, string(req.Message))
case "PKIOperation":
resp.Data, resp.Err = svc.PKIOperation(ctx, req.Message)
default:
return nil, errors.New("operation not implemented")
}
return resp, nil
}
}
// SCEPRequest is a SCEP server request.
type SCEPRequest struct {
Operation string
Message []byte
}
func (r SCEPRequest) scepOperation() string { return r.Operation }
// SCEPResponse is a SCEP server response.
// Business errors will be encoded as a CertRep message
// with pkiStatus FAILURE and a failInfo attribute.
type SCEPResponse struct {
operation string
CACertNum int
Data []byte
Err error
}
func (r SCEPResponse) scepOperation() string { return r.operation }
// EndpointLoggingMiddleware returns an endpoint middleware that logs the
// duration of each invocation, and the resulting error, if any.
func EndpointLoggingMiddleware(logger log.Logger) endpoint.Middleware {
return func(next endpoint.Endpoint) endpoint.Endpoint {
return func(ctx context.Context, request interface{}) (response interface{}, err error) {
var keyvals []interface{}
// check if this is a scep endpoint, if it is, append the method to the log.
if oper, ok := request.(interface {
scepOperation() string
}); ok {
keyvals = append(keyvals, "op", oper.scepOperation())
}
defer func(begin time.Time) {
logger.Log(append(keyvals, "error", err, "took", time.Since(begin))...)
}(time.Now())
return next(ctx, request)
}
}
}
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