forked from TrueCloudLab/certificates
292 lines
10 KiB
Go
292 lines
10 KiB
Go
package api
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import (
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"crypto/tls"
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"crypto/x509"
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"encoding/json"
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"encoding/pem"
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"fmt"
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"net"
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"net/http"
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"time"
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"github.com/go-chi/chi"
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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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)
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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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// Clock that returns time in UTC rounded to seconds.
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type Clock struct{}
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// Now returns the UTC time rounded to seconds.
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func (c *Clock) Now() time.Time {
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return time.Now().UTC().Truncate(time.Second)
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}
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var clock Clock
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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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// Handler is the ACME API request handler.
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type Handler struct {
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db acme.DB
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backdate provisioner.Duration
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ca acme.CertificateAuthority
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linker Linker
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validateChallengeOptions *acme.ValidateChallengeOptions
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}
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// HandlerOptions required to create a new ACME API request handler.
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type HandlerOptions struct {
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Backdate provisioner.Duration
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// DB storage backend that impements the acme.DB interface.
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DB acme.DB
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// DNS the host used to generate accurate ACME links. By default the authority
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// will use the Host from the request, so this value will only be used if
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// request.Host is empty.
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DNS string
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// Prefix is a URL path prefix under which the ACME api is served. This
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// prefix is required to generate accurate ACME links.
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// E.g. https://ca.smallstep.com/acme/my-acme-provisioner/new-account --
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// "acme" is the prefix from which the ACME api is accessed.
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Prefix string
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CA acme.CertificateAuthority
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}
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// NewHandler returns a new ACME API handler.
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func NewHandler(ops HandlerOptions) api.RouterHandler {
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client := http.Client{
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Timeout: 30 * time.Second,
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}
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dialer := &net.Dialer{
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Timeout: 30 * time.Second,
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}
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return &Handler{
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ca: ops.CA,
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db: ops.DB,
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backdate: ops.Backdate,
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linker: NewLinker(ops.DNS, ops.Prefix),
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validateChallengeOptions: &acme.ValidateChallengeOptions{
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HTTPGet: client.Get,
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LookupTxt: net.LookupTXT,
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TLSDial: func(network, addr string, config *tls.Config) (*tls.Conn, error) {
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return tls.DialWithDialer(dialer, network, addr, config)
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},
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},
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}
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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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getPath := h.linker.GetUnescapedPathSuffix
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// Standard ACME API
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r.MethodFunc("GET", getPath(NewNonceLinkType, "{provisionerID}"), h.baseURLFromRequest(h.lookupProvisioner(h.addNonce(h.addDirLink(h.GetNonce)))))
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r.MethodFunc("HEAD", getPath(NewNonceLinkType, "{provisionerID}"), h.baseURLFromRequest(h.lookupProvisioner(h.addNonce(h.addDirLink(h.GetNonce)))))
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r.MethodFunc("GET", getPath(DirectoryLinkType, "{provisionerID}"), h.baseURLFromRequest(h.lookupProvisioner(h.GetDirectory)))
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r.MethodFunc("HEAD", getPath(DirectoryLinkType, "{provisionerID}"), h.baseURLFromRequest(h.lookupProvisioner(h.GetDirectory)))
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extractPayloadByJWK := func(next nextHTTP) nextHTTP {
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return h.baseURLFromRequest(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.baseURLFromRequest(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", getPath(NewAccountLinkType, "{provisionerID}"), extractPayloadByJWK(h.NewAccount))
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r.MethodFunc("POST", getPath(AccountLinkType, "{provisionerID}", "{accID}"), extractPayloadByKid(h.GetOrUpdateAccount))
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r.MethodFunc("POST", getPath(KeyChangeLinkType, "{provisionerID}", "{accID}"), extractPayloadByKid(h.NotImplemented))
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r.MethodFunc("POST", getPath(NewOrderLinkType, "{provisionerID}"), extractPayloadByKid(h.NewOrder))
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r.MethodFunc("POST", getPath(OrderLinkType, "{provisionerID}", "{ordID}"), extractPayloadByKid(h.isPostAsGet(h.GetOrder)))
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r.MethodFunc("POST", getPath(OrdersByAccountLinkType, "{provisionerID}", "{accID}"), extractPayloadByKid(h.isPostAsGet(h.GetOrdersByAccountID)))
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r.MethodFunc("POST", getPath(FinalizeLinkType, "{provisionerID}", "{ordID}"), extractPayloadByKid(h.FinalizeOrder))
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r.MethodFunc("POST", getPath(AuthzLinkType, "{provisionerID}", "{authzID}"), extractPayloadByKid(h.isPostAsGet(h.GetAuthorization)))
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r.MethodFunc("POST", getPath(ChallengeLinkType, "{provisionerID}", "{authzID}", "{chID}"), extractPayloadByKid(h.GetChallenge))
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r.MethodFunc("POST", getPath(CertificateLinkType, "{provisionerID}", "{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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type Meta struct {
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TermsOfService string `json:"termsOfService,omitempty"`
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Website string `json:"website,omitempty"`
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CaaIdentities []string `json:"caaIdentities,omitempty"`
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ExternalAccountRequired bool `json:"externalAccountRequired,omitempty"`
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}
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// Directory represents an ACME directory for configuring clients.
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type Directory struct {
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NewNonce string `json:"newNonce"`
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NewAccount string `json:"newAccount"`
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NewOrder string `json:"newOrder"`
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RevokeCert string `json:"revokeCert"`
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KeyChange string `json:"keyChange"`
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Meta Meta `json:"meta"`
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}
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// ToLog enables response logging for the Directory type.
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func (d *Directory) ToLog() (interface{}, error) {
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b, err := json.Marshal(d)
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if err != nil {
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return nil, acme.WrapErrorISE(err, "error marshaling directory for logging")
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}
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return string(b), nil
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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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ctx := r.Context()
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acmeProv, err := acmeProvisionerFromContext(ctx)
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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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api.JSON(w, &Directory{
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NewNonce: h.linker.GetLink(ctx, NewNonceLinkType),
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NewAccount: h.linker.GetLink(ctx, NewAccountLinkType),
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NewOrder: h.linker.GetLink(ctx, NewOrderLinkType),
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RevokeCert: h.linker.GetLink(ctx, RevokeCertLinkType),
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KeyChange: h.linker.GetLink(ctx, KeyChangeLinkType),
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Meta: Meta{
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ExternalAccountRequired: acmeProv.RequireEAB,
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},
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})
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}
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// NotImplemented returns a 501 and is generally a placeholder for functionality which
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// MAY be added at some point in the future but is not in any way a guarantee of such.
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func (h *Handler) NotImplemented(w http.ResponseWriter, r *http.Request) {
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api.WriteError(w, acme.NewError(acme.ErrorNotImplementedType, "this API is not implemented"))
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}
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// GetAuthorization ACME api for retrieving an Authz.
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func (h *Handler) GetAuthorization(w http.ResponseWriter, r *http.Request) {
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ctx := r.Context()
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acc, err := accountFromContext(ctx)
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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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az, err := h.db.GetAuthorization(ctx, chi.URLParam(r, "authzID"))
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if err != nil {
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api.WriteError(w, acme.WrapErrorISE(err, "error retrieving authorization"))
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return
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}
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if acc.ID != az.AccountID {
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api.WriteError(w, acme.NewError(acme.ErrorUnauthorizedType,
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"account '%s' does not own authorization '%s'", acc.ID, az.ID))
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return
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}
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if err = az.UpdateStatus(ctx, h.db); err != nil {
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api.WriteError(w, acme.WrapErrorISE(err, "error updating authorization status"))
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return
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}
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h.linker.LinkAuthorization(ctx, az)
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w.Header().Set("Location", h.linker.GetLink(ctx, AuthzLinkType, az.ID))
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api.JSON(w, az)
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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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ctx := r.Context()
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acc, err := accountFromContext(ctx)
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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(ctx)
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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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azID := chi.URLParam(r, "authzID")
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ch, err := h.db.GetChallenge(ctx, chi.URLParam(r, "chID"), azID)
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if err != nil {
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api.WriteError(w, acme.WrapErrorISE(err, "error retrieving challenge"))
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return
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}
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ch.AuthorizationID = azID
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if acc.ID != ch.AccountID {
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api.WriteError(w, acme.NewError(acme.ErrorUnauthorizedType,
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"account '%s' does not own challenge '%s'", acc.ID, ch.ID))
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return
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}
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jwk, err := jwkFromContext(ctx)
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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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if err = ch.Validate(ctx, h.db, jwk, h.validateChallengeOptions); err != nil {
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api.WriteError(w, acme.WrapErrorISE(err, "error validating challenge"))
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return
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}
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h.linker.LinkChallenge(ctx, ch, azID)
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w.Header().Add("Link", link(h.linker.GetLink(ctx, AuthzLinkType, azID), "up"))
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w.Header().Set("Location", h.linker.GetLink(ctx, ChallengeLinkType, azID, ch.ID))
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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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ctx := r.Context()
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acc, err := accountFromContext(ctx)
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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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cert, err := h.db.GetCertificate(ctx, certID)
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if err != nil {
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api.WriteError(w, acme.WrapErrorISE(err, "error retrieving certificate"))
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return
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}
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if cert.AccountID != acc.ID {
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api.WriteError(w, acme.NewError(acme.ErrorUnauthorizedType,
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"account '%s' does not own certificate '%s'", acc.ID, certID))
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return
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}
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var certBytes []byte
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for _, c := range append([]*x509.Certificate{cert.Leaf}, cert.Intermediates...) {
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certBytes = append(certBytes, pem.EncodeToMemory(&pem.Block{
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Type: "CERTIFICATE",
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Bytes: c.Raw,
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})...)
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}
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api.LogCertificate(w, cert.Leaf)
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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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