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Add support for multiple SCEP provisioners

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Similarly to how ACME suppors multiple provisioners, it's
now possible to load the right provisioner based on the
URL.
This commit is contained in:
Herman Slatman 2021-03-05 12:40:42 +01:00 committed by max furman
parent a191319da9
commit 5df60c5a9b
4 changed files with 78 additions and 26 deletions
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2
ca/ca.go
View file

@ -212,7 +212,7 @@ func (ca *CA) Init(config *config.Config) (*CA, error) {
})
}
// helpful routine for logging all routes //
// helpful routine for logging all routes
//dumpRoutes(mux)
// Add monitoring if configured

39
scep/api/api.go
View file

@ -9,8 +9,10 @@ import (
"io"
"io/ioutil"
"net/http"
"net/url"
"strings"
"github.com/go-chi/chi"
"github.com/smallstep/certificates/api"
"github.com/smallstep/certificates/authority/provisioner"
"github.com/smallstep/certificates/scep"
@ -76,14 +78,10 @@ func New(scepAuth scep.Interface) api.RouterHandler {
// Route traffic and implement the Router interface.
func (h *Handler) Route(r api.Router) {
//getLink := h.Auth.GetLinkExplicit
//fmt.Println(getLink)
getLink := h.Auth.GetLinkExplicit
//r.MethodFunc("GET", "/bla", h.baseURLFromRequest(h.lookupProvisioner(nil)))
//r.MethodFunc("GET", getLink(acme.NewNonceLink, "{provisionerID}", false, nil), h.baseURLFromRequest(h.lookupProvisioner(h.addNonce(h.GetNonce))))
r.MethodFunc(http.MethodGet, "/", h.lookupProvisioner(h.Get))
r.MethodFunc(http.MethodPost, "/", h.lookupProvisioner(h.Post))
r.MethodFunc(http.MethodGet, getLink("{provisionerID}", false, nil), h.lookupProvisioner(h.Get))
r.MethodFunc(http.MethodPost, getLink("{provisionerID}", false, nil), h.lookupProvisioner(h.Post))
}
@ -202,16 +200,12 @@ func decodeSCEPRequest(r *http.Request) (SCEPRequest, error) {
func (h *Handler) lookupProvisioner(next nextHTTP) nextHTTP {
return func(w http.ResponseWriter, r *http.Request) {
// name := chi.URLParam(r, "provisionerID")
// provisionerID, err := url.PathUnescape(name)
// if err != nil {
// api.WriteError(w, fmt.Errorf("error url unescaping provisioner id '%s'", name))
// return
// }
// TODO: make this configurable; and we might want to look at being able to provide multiple,
// like the ACME one? The below assumes a SCEP provider (scep/) called "scep1" exists.
provisionerID := "scep1"
name := chi.URLParam(r, "provisionerID")
provisionerID, err := url.PathUnescape(name)
if err != nil {
api.WriteError(w, fmt.Errorf("error url unescaping provisioner id '%s'", name))
return
}
p, err := h.Auth.LoadProvisionerByID("scep/" + provisionerID)
if err != nil {
@ -275,6 +269,8 @@ func (h *Handler) PKIOperation(ctx context.Context, request SCEPRequest) (SCEPRe
response := SCEPResponse{Operation: opnPKIOperation}
fmt.Println("BEFORE PARSING")
microMsg, err := microscep.ParsePKIMessage(request.Message)
if err != nil {
return SCEPResponse{}, err
@ -287,7 +283,12 @@ func (h *Handler) PKIOperation(ctx context.Context, request SCEPRequest) (SCEPRe
Raw: microMsg.Raw,
}
fmt.Println("len raw:", len(microMsg.Raw))
fmt.Println("AFTER PARSING")
if err := h.Auth.DecryptPKIEnvelope(ctx, msg); err != nil {
fmt.Println("ERROR IN DECRYPTPKIENVELOPE")
return SCEPResponse{}, err
}
@ -311,6 +312,8 @@ func (h *Handler) PKIOperation(ctx context.Context, request SCEPRequest) (SCEPRe
response.Data = certRep.Raw
response.Certificate = certRep.Certificate
fmt.Println("HERE!!!")
return response, nil
}
@ -336,7 +339,7 @@ func writeSCEPResponse(w http.ResponseWriter, response SCEPResponse) {
func writeError(w http.ResponseWriter, err error) {
scepError := &scep.Error{
Err: fmt.Errorf("post request failed: %w", err),
Message: err.Error(),
Status: http.StatusInternalServerError, // TODO: make this a param?
}
api.WriteError(w, scepError)

55
scep/authority.go
View file

@ -8,6 +8,7 @@ import (
"crypto/x509"
"errors"
"fmt"
"net/url"
"github.com/smallstep/certificates/authority/provisioner"
database "github.com/smallstep/certificates/db"
@ -55,6 +56,8 @@ type Interface interface {
GetCACertificates() ([]*x509.Certificate, error)
DecryptPKIEnvelope(ctx context.Context, msg *PKIMessage) error
SignCSR(ctx context.Context, csr *x509.CertificateRequest, msg *PKIMessage) (*PKIMessage, error)
GetLinkExplicit(provName string, absoluteLink bool, baseURL *url.URL, inputs ...string) string
}
// Authority is the layer that handles all SCEP interactions.
@ -130,6 +133,44 @@ func (a *Authority) LoadProvisionerByID(id string) (provisioner.Interface, error
return a.signAuth.LoadProvisionerByID(id)
}
// GetLinkExplicit returns the requested link from the directory.
func (a *Authority) GetLinkExplicit(provName string, abs bool, baseURL *url.URL, inputs ...string) string {
// TODO: taken from ACME; move it to directory (if we need a directory in SCEP)?
return a.getLinkExplicit(provName, abs, baseURL, inputs...)
}
// getLinkExplicit returns an absolute or partial path to the given resource and a base
// URL dynamically obtained from the request for which the link is being calculated.
func (a *Authority) getLinkExplicit(provisionerName string, abs bool, baseURL *url.URL, inputs ...string) string {
// TODO: do we need to provide a way to provide a different suffix/base?
// Like "/cgi-bin/pkiclient.exe"? Or would it be enough to have that as the name?
link := fmt.Sprintf("/%s", provisionerName)
if abs {
// Copy the baseURL value from the pointer. https://github.com/golang/go/issues/38351
u := url.URL{}
if baseURL != nil {
u = *baseURL
}
// If no Scheme is set, then default to https.
if u.Scheme == "" {
u.Scheme = "https"
}
// If no Host is set, then use the default (first DNS attr in the ca.json).
if u.Host == "" {
u.Host = a.dns
}
u.Path = a.prefix + link
return u.String()
}
return link
}
// GetCACertificates returns the certificate (chain) for the CA
func (a *Authority) GetCACertificates() ([]*x509.Certificate, error) {
@ -164,6 +205,8 @@ func (a *Authority) DecryptPKIEnvelope(ctx context.Context, msg *PKIMessage) err
return err
}
fmt.Println("len content:", len(p7.Content))
var tID microscep.TransactionID
if err := p7.UnmarshalSignedAttribute(oidSCEPtransactionID, &tID); err != nil {
return err
@ -176,11 +219,17 @@ func (a *Authority) DecryptPKIEnvelope(ctx context.Context, msg *PKIMessage) err
msg.p7 = p7
//p7c, err := pkcs7.Parse(p7.Content)
p7c, err := pkcs7.Parse(p7.Content)
if err != nil {
return err
}
fmt.Println(tID)
fmt.Println(msgType)
fmt.Println("len p7c content:", len(p7c.Content))
envelope, err := p7c.Decrypt(a.intermediateCertificate, a.service.Decrypter)
if err != nil {
return err
@ -308,7 +357,7 @@ func (a *Authority) SignCSR(ctx context.Context, csr *x509.CertificateRequest, m
// fmt.Println(string(cert.SubjectKeyId))
// create a degenerate cert structure
deg, err := DegenerateCertificates([]*x509.Certificate{cert})
deg, err := degenerateCertificates([]*x509.Certificate{cert})
if err != nil {
return nil, err
}
@ -380,8 +429,8 @@ func (a *Authority) SignCSR(ctx context.Context, csr *x509.CertificateRequest, m
return crepMsg, nil
}
// DegenerateCertificates creates degenerate certificates pkcs#7 type
func DegenerateCertificates(certs []*x509.Certificate) ([]byte, error) {
// degenerateCertificates creates degenerate certificates pkcs#7 type
func degenerateCertificates(certs []*x509.Certificate) ([]byte, error) {
var buf bytes.Buffer
for _, cert := range certs {
buf.Write(cert.Raw)

6
scep/errors.go
View file

@ -4,8 +4,8 @@ package scep
type Error struct {
// Type ProbType
// Detail string
Err error
Status int
Message string `json:"message"`
Status int `json:"-"`
// Sub []*Error
// Identifier *Identifier
}
@ -15,5 +15,5 @@ func (e *Error) Error() string {
// if e.Err == nil {
// return e.Detail
// }
return e.Err.Error()
return e.Message
}