smallstep-certificates/acme/api/handler.go

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package api
import (
"context"
"crypto/x509"
"encoding/pem"
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"fmt"
"net/http"
"github.com/go-chi/chi"
"github.com/pkg/errors"
"github.com/smallstep/certificates/acme"
"github.com/smallstep/certificates/api"
)
func link(url, typ string) string {
return fmt.Sprintf("<%s>;rel=\"%s\"", url, typ)
}
type payloadInfo struct {
value []byte
isPostAsGet bool
isEmptyJSON bool
}
// payloadFromContext searches the context for a payload. Returns the payload
// or an error.
func payloadFromContext(ctx context.Context) (*payloadInfo, error) {
val, ok := ctx.Value(acme.PayloadContextKey).(*payloadInfo)
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if !ok || val == nil {
return nil, acme.ServerInternalErr(errors.Errorf("payload expected in request context"))
}
return val, nil
}
// New returns a new ACME API router.
func New(acmeAuth acme.Interface) api.RouterHandler {
return &Handler{acmeAuth}
}
// Handler is the ACME request handler.
type Handler struct {
Auth acme.Interface
}
// Route traffic and implement the Router interface.
func (h *Handler) Route(r api.Router) {
getLink := h.Auth.GetLinkExplicit
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// Standard ACME API
r.MethodFunc("GET", getLink(acme.NewNonceLink, "{provisionerID}", false, nil), h.baseURLFromRequest(h.lookupProvisioner(h.addNonce(h.GetNonce))))
r.MethodFunc("HEAD", getLink(acme.NewNonceLink, "{provisionerID}", false, nil), h.baseURLFromRequest(h.lookupProvisioner(h.addNonce(h.GetNonce))))
r.MethodFunc("GET", getLink(acme.DirectoryLink, "{provisionerID}", false, nil), h.baseURLFromRequest(h.lookupProvisioner(h.addNonce(h.GetDirectory))))
r.MethodFunc("HEAD", getLink(acme.DirectoryLink, "{provisionerID}", false, nil), h.baseURLFromRequest(h.lookupProvisioner(h.addNonce(h.GetDirectory))))
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extractPayloadByJWK := func(next nextHTTP) nextHTTP {
return h.baseURLFromRequest(h.lookupProvisioner(h.addNonce(h.addDirLink(h.verifyContentType(h.parseJWS(h.validateJWS(h.extractJWK(h.verifyAndExtractJWSPayload(next)))))))))
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}
extractPayloadByKid := func(next nextHTTP) nextHTTP {
return h.baseURLFromRequest(h.lookupProvisioner(h.addNonce(h.addDirLink(h.verifyContentType(h.parseJWS(h.validateJWS(h.lookupJWK(h.verifyAndExtractJWSPayload(next)))))))))
}
r.MethodFunc("POST", getLink(acme.NewAccountLink, "{provisionerID}", false, nil), extractPayloadByJWK(h.NewAccount))
r.MethodFunc("POST", getLink(acme.AccountLink, "{provisionerID}", false, nil, "{accID}"), extractPayloadByKid(h.GetUpdateAccount))
r.MethodFunc("POST", getLink(acme.KeyChangeLink, "{provisionerID}", false, nil, "{accID}"), extractPayloadByKid(h.NotImplemented))
r.MethodFunc("POST", getLink(acme.NewOrderLink, "{provisionerID}", false, nil), extractPayloadByKid(h.NewOrder))
r.MethodFunc("POST", getLink(acme.OrderLink, "{provisionerID}", false, nil, "{ordID}"), extractPayloadByKid(h.isPostAsGet(h.GetOrder)))
r.MethodFunc("POST", getLink(acme.OrdersByAccountLink, "{provisionerID}", false, nil, "{accID}"), extractPayloadByKid(h.isPostAsGet(h.GetOrdersByAccount)))
r.MethodFunc("POST", getLink(acme.FinalizeLink, "{provisionerID}", false, nil, "{ordID}"), extractPayloadByKid(h.FinalizeOrder))
r.MethodFunc("POST", getLink(acme.AuthzLink, "{provisionerID}", false, nil, "{authzID}"), extractPayloadByKid(h.isPostAsGet(h.GetAuthz)))
r.MethodFunc("POST", getLink(acme.ChallengeLink, "{provisionerID}", false, nil, "{chID}"), extractPayloadByKid(h.GetChallenge))
r.MethodFunc("POST", getLink(acme.CertificateLink, "{provisionerID}", false, nil, "{certID}"), extractPayloadByKid(h.isPostAsGet(h.GetCertificate)))
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}
// GetNonce just sets the right header since a Nonce is added to each response
// by middleware by default.
func (h *Handler) GetNonce(w http.ResponseWriter, r *http.Request) {
if r.Method == "HEAD" {
w.WriteHeader(http.StatusOK)
} else {
w.WriteHeader(http.StatusNoContent)
}
}
// GetDirectory is the ACME resource for returning a directory configuration
// for client configuration.
func (h *Handler) GetDirectory(w http.ResponseWriter, r *http.Request) {
dir, err := h.Auth.GetDirectory(r.Context())
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if err != nil {
api.WriteError(w, err)
return
}
api.JSON(w, dir)
}
// NotImplemented returns a 501 and is generally a placeholder for functionality which
// MAY be added at some point in the future but is not in any way a guarantee of such.
func (h *Handler) NotImplemented(w http.ResponseWriter, r *http.Request) {
api.WriteError(w, acme.NotImplemented(nil).ToACME())
}
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// GetAuthz ACME api for retrieving an Authz.
func (h *Handler) GetAuthz(w http.ResponseWriter, r *http.Request) {
acc, err := acme.AccountFromContext(r.Context())
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if err != nil {
api.WriteError(w, err)
return
}
authz, err := h.Auth.GetAuthz(r.Context(), acc.GetID(), chi.URLParam(r, "authzID"))
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if err != nil {
api.WriteError(w, err)
return
}
w.Header().Set("Location", h.Auth.GetLink(r.Context(), acme.AuthzLink, true, authz.GetID()))
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api.JSON(w, authz)
}
// GetChallenge ACME api for retrieving a Challenge.
func (h *Handler) GetChallenge(w http.ResponseWriter, r *http.Request) {
acc, err := acme.AccountFromContext(r.Context())
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if err != nil {
api.WriteError(w, err)
return
}
// Just verify that the payload was set, since we're not strictly adhering
// to ACME V2 spec for reasons specified below.
_, err = payloadFromContext(r.Context())
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if err != nil {
api.WriteError(w, err)
return
}
// NOTE: We should be checking that the request is either a POST-as-GET, or
// that the payload is an empty JSON block ({}). However, older ACME clients
// still send a vestigial body (rather than an empty JSON block) and
// strict enforcement would render these clients broken. For the time being
// we'll just ignore the body.
var (
ch *acme.Challenge
chID = chi.URLParam(r, "chID")
)
ch, err = h.Auth.ValidateChallenge(r.Context(), acc.GetID(), chID, acc.GetKey())
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if err != nil {
api.WriteError(w, err)
return
}
w.Header().Add("Link", link(h.Auth.GetLink(r.Context(), acme.AuthzLink, true, ch.GetAuthzID()), "up"))
w.Header().Set("Location", h.Auth.GetLink(r.Context(), acme.ChallengeLink, true, ch.GetID()))
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api.JSON(w, ch)
}
// GetCertificate ACME api for retrieving a Certificate.
func (h *Handler) GetCertificate(w http.ResponseWriter, r *http.Request) {
acc, err := acme.AccountFromContext(r.Context())
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if err != nil {
api.WriteError(w, err)
return
}
certID := chi.URLParam(r, "certID")
certBytes, err := h.Auth.GetCertificate(acc.GetID(), certID)
if err != nil {
api.WriteError(w, err)
return
}
block, _ := pem.Decode(certBytes)
if block == nil {
api.WriteError(w, acme.ServerInternalErr(errors.New("failed to decode any certificates from generated certBytes")))
return
}
cert, err := x509.ParseCertificate(block.Bytes)
if err != nil {
api.WriteError(w, acme.Wrap(err, "failed to parse generated leaf certificate"))
return
}
api.LogCertificate(w, cert)
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w.Header().Set("Content-Type", "application/pem-certificate-chain; charset=utf-8")
w.Write(certBytes)
}