209 lines
7.3 KiB
Go
209 lines
7.3 KiB
Go
package api
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import (
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"fmt"
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"net/http"
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"github.com/go-chi/chi"
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"github.com/pkg/errors"
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"github.com/smallstep/certificates/acme"
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"github.com/smallstep/certificates/api"
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"github.com/smallstep/certificates/authority/provisioner"
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"github.com/smallstep/cli/jose"
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)
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func link(url, typ string) string {
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return fmt.Sprintf("<%s>;rel=\"%s\"", url, typ)
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}
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type contextKey string
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const (
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accContextKey = contextKey("acc")
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jwsContextKey = contextKey("jws")
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jwkContextKey = contextKey("jwk")
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payloadContextKey = contextKey("payload")
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provisionerContextKey = contextKey("provisioner")
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)
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type payloadInfo struct {
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value []byte
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isPostAsGet bool
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isEmptyJSON bool
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}
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func accountFromContext(r *http.Request) (*acme.Account, error) {
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val, ok := r.Context().Value(accContextKey).(*acme.Account)
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if !ok || val == nil {
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return nil, acme.AccountDoesNotExistErr(nil)
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}
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return val, nil
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}
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func jwkFromContext(r *http.Request) (*jose.JSONWebKey, error) {
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val, ok := r.Context().Value(jwkContextKey).(*jose.JSONWebKey)
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if !ok || val == nil {
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return nil, acme.ServerInternalErr(errors.Errorf("jwk expected in request context"))
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}
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return val, nil
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}
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func jwsFromContext(r *http.Request) (*jose.JSONWebSignature, error) {
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val, ok := r.Context().Value(jwsContextKey).(*jose.JSONWebSignature)
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if !ok || val == nil {
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return nil, acme.ServerInternalErr(errors.Errorf("jws expected in request context"))
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}
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return val, nil
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}
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func payloadFromContext(r *http.Request) (*payloadInfo, error) {
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val, ok := r.Context().Value(payloadContextKey).(*payloadInfo)
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if !ok || val == nil {
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return nil, acme.ServerInternalErr(errors.Errorf("payload expected in request context"))
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}
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return val, nil
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}
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func provisionerFromContext(r *http.Request) (provisioner.Interface, error) {
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val, ok := r.Context().Value(provisionerContextKey).(provisioner.Interface)
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if !ok || val == nil {
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return nil, acme.ServerInternalErr(errors.Errorf("provisioner expected in request context"))
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}
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return val, nil
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}
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// New returns a new ACME API router.
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func New(acmeAuth acme.Interface) api.RouterHandler {
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return &Handler{acmeAuth}
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}
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// Handler is the ACME request handler.
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type Handler struct {
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Auth acme.Interface
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}
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// Route traffic and implement the Router interface.
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func (h *Handler) Route(r api.Router) {
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getLink := h.Auth.GetLink
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// Standard ACME API
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r.MethodFunc("GET", getLink(acme.NewNonceLink, "{provisionerID}", false), h.lookupProvisioner(h.addNonce(h.GetNonce)))
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r.MethodFunc("HEAD", getLink(acme.NewNonceLink, "{provisionerID}", false), h.lookupProvisioner(h.addNonce(h.GetNonce)))
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r.MethodFunc("GET", getLink(acme.DirectoryLink, "{provisionerID}", false), h.lookupProvisioner(h.addNonce(h.GetDirectory)))
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r.MethodFunc("HEAD", getLink(acme.DirectoryLink, "{provisionerID}", false), h.lookupProvisioner(h.addNonce(h.GetDirectory)))
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extractPayloadByJWK := func(next nextHTTP) nextHTTP {
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return h.lookupProvisioner(h.addNonce(h.addDirLink(h.verifyContentType(h.parseJWS(h.validateJWS(h.extractJWK(h.verifyAndExtractJWSPayload(next))))))))
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}
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extractPayloadByKid := func(next nextHTTP) nextHTTP {
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return h.lookupProvisioner(h.addNonce(h.addDirLink(h.verifyContentType(h.parseJWS(h.validateJWS(h.lookupJWK(h.verifyAndExtractJWSPayload(next))))))))
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}
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r.MethodFunc("POST", getLink(acme.NewAccountLink, "{provisionerID}", false), extractPayloadByJWK(h.NewAccount))
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r.MethodFunc("POST", getLink(acme.AccountLink, "{provisionerID}", false, "{accID}"), extractPayloadByKid(h.GetUpdateAccount))
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r.MethodFunc("POST", getLink(acme.NewOrderLink, "{provisionerID}", false), extractPayloadByKid(h.NewOrder))
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r.MethodFunc("POST", getLink(acme.OrderLink, "{provisionerID}", false, "{ordID}"), extractPayloadByKid(h.isPostAsGet(h.GetOrder)))
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r.MethodFunc("POST", getLink(acme.OrdersByAccountLink, "{provisionerID}", false, "{accID}"), extractPayloadByKid(h.isPostAsGet(h.GetOrdersByAccount)))
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r.MethodFunc("POST", getLink(acme.FinalizeLink, "{provisionerID}", false, "{ordID}"), extractPayloadByKid(h.FinalizeOrder))
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r.MethodFunc("POST", getLink(acme.AuthzLink, "{provisionerID}", false, "{authzID}"), extractPayloadByKid(h.isPostAsGet(h.GetAuthz)))
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r.MethodFunc("POST", getLink(acme.ChallengeLink, "{provisionerID}", false, "{chID}"), extractPayloadByKid(h.GetChallenge))
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r.MethodFunc("POST", getLink(acme.CertificateLink, "{provisionerID}", false, "{certID}"), extractPayloadByKid(h.isPostAsGet(h.GetCertificate)))
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}
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// GetNonce just sets the right header since a Nonce is added to each response
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// by middleware by default.
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func (h *Handler) GetNonce(w http.ResponseWriter, r *http.Request) {
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if r.Method == "HEAD" {
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w.WriteHeader(http.StatusOK)
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} else {
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w.WriteHeader(http.StatusNoContent)
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}
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}
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// GetDirectory is the ACME resource for returning a directory configuration
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// for client configuration.
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func (h *Handler) GetDirectory(w http.ResponseWriter, r *http.Request) {
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prov, err := provisionerFromContext(r)
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if err != nil {
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api.WriteError(w, err)
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return
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}
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dir := h.Auth.GetDirectory(prov)
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api.JSON(w, dir)
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}
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// GetAuthz ACME api for retrieving an Authz.
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func (h *Handler) GetAuthz(w http.ResponseWriter, r *http.Request) {
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prov, err := provisionerFromContext(r)
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if err != nil {
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api.WriteError(w, err)
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return
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}
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acc, err := accountFromContext(r)
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if err != nil {
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api.WriteError(w, err)
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return
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}
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authz, err := h.Auth.GetAuthz(prov, acc.GetID(), chi.URLParam(r, "authzID"))
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if err != nil {
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api.WriteError(w, err)
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return
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}
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w.Header().Set("Location", h.Auth.GetLink(acme.AuthzLink, acme.URLSafeProvisionerName(prov), true, authz.GetID()))
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api.JSON(w, authz)
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}
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// GetChallenge ACME api for retrieving a Challenge.
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func (h *Handler) GetChallenge(w http.ResponseWriter, r *http.Request) {
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prov, err := provisionerFromContext(r)
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if err != nil {
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api.WriteError(w, err)
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return
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}
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acc, err := accountFromContext(r)
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if err != nil {
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api.WriteError(w, err)
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return
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}
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// Just verify that the payload was set, since we're not strictly adhering
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// to ACME V2 spec for reasons specified below.
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_, err = payloadFromContext(r)
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if err != nil {
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api.WriteError(w, err)
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return
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}
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// NOTE: We should be checking that the request is either a POST-as-GET, or
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// that the payload is an empty JSON block ({}). However, older ACME clients
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// still send a vestigial body (rather than an empty JSON block) and
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// strict enforcement would render these clients broken. For the time being
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// we'll just ignore the body.
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var (
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ch *acme.Challenge
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chID = chi.URLParam(r, "chID")
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)
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ch, err = h.Auth.ValidateChallenge(prov, acc.GetID(), chID, acc.GetKey())
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if err != nil {
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api.WriteError(w, err)
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return
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}
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getLink := h.Auth.GetLink
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w.Header().Add("Link", link(getLink(acme.AuthzLink, acme.URLSafeProvisionerName(prov), true, ch.GetAuthzID()), "up"))
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w.Header().Set("Location", getLink(acme.ChallengeLink, acme.URLSafeProvisionerName(prov), true, ch.GetID()))
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api.JSON(w, ch)
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}
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// GetCertificate ACME api for retrieving a Certificate.
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func (h *Handler) GetCertificate(w http.ResponseWriter, r *http.Request) {
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acc, err := accountFromContext(r)
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if err != nil {
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api.WriteError(w, err)
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return
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}
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certID := chi.URLParam(r, "certID")
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certBytes, err := h.Auth.GetCertificate(acc.GetID(), certID)
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if err != nil {
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api.WriteError(w, err)
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return
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}
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w.Header().Set("Content-Type", "application/pem-certificate-chain; charset=utf-8")
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w.Write(certBytes)
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}
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