383 lines
11 KiB
Go
383 lines
11 KiB
Go
package api
|
|
|
|
import (
|
|
"context"
|
|
"crypto/x509"
|
|
"encoding/base64"
|
|
"encoding/json"
|
|
"net"
|
|
"net/http"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/go-chi/chi"
|
|
|
|
"go.step.sm/crypto/randutil"
|
|
|
|
"github.com/smallstep/certificates/acme"
|
|
"github.com/smallstep/certificates/api/render"
|
|
"github.com/smallstep/certificates/authority/policy"
|
|
"github.com/smallstep/certificates/authority/provisioner"
|
|
)
|
|
|
|
// NewOrderRequest represents the body for a NewOrder request.
|
|
type NewOrderRequest struct {
|
|
Identifiers []acme.Identifier `json:"identifiers"`
|
|
NotBefore time.Time `json:"notBefore,omitempty"`
|
|
NotAfter time.Time `json:"notAfter,omitempty"`
|
|
}
|
|
|
|
// Validate validates a new-order request body.
|
|
func (n *NewOrderRequest) Validate() error {
|
|
if len(n.Identifiers) == 0 {
|
|
return acme.NewError(acme.ErrorMalformedType, "identifiers list cannot be empty")
|
|
}
|
|
for _, id := range n.Identifiers {
|
|
if !(id.Type == acme.DNS || id.Type == acme.IP || id.Type == acme.PermanentIdentifier) {
|
|
return acme.NewError(acme.ErrorMalformedType, "identifier type unsupported: %s", id.Type)
|
|
}
|
|
if id.Type == acme.IP && net.ParseIP(id.Value) == nil {
|
|
return acme.NewError(acme.ErrorMalformedType, "invalid IP address: %s", id.Value)
|
|
}
|
|
// TODO(hs): add some validations for DNS domains?
|
|
// TODO(hs): combine the errors from this with allow/deny policy, like example error in https://datatracker.ietf.org/doc/html/rfc8555#section-6.7.1
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// FinalizeRequest captures the body for a Finalize order request.
|
|
type FinalizeRequest struct {
|
|
CSR string `json:"csr"`
|
|
csr *x509.CertificateRequest
|
|
}
|
|
|
|
// Validate validates a finalize request body.
|
|
func (f *FinalizeRequest) Validate() error {
|
|
var err error
|
|
// RFC 8555 isn't 100% conclusive about using raw base64-url encoding for the
|
|
// CSR specifically, instead of "normal" base64-url encoding (incl. padding).
|
|
// By trimming the padding from CSRs submitted by ACME clients that use
|
|
// base64-url encoding instead of raw base64-url encoding, these are also
|
|
// supported. This was reported in https://github.com/smallstep/certificates/issues/939
|
|
// to be the case for a Synology DSM NAS system.
|
|
csrBytes, err := base64.RawURLEncoding.DecodeString(strings.TrimRight(f.CSR, "="))
|
|
if err != nil {
|
|
return acme.WrapError(acme.ErrorMalformedType, err, "error base64url decoding csr")
|
|
}
|
|
f.csr, err = x509.ParseCertificateRequest(csrBytes)
|
|
if err != nil {
|
|
return acme.WrapError(acme.ErrorMalformedType, err, "unable to parse csr")
|
|
}
|
|
if err = f.csr.CheckSignature(); err != nil {
|
|
return acme.WrapError(acme.ErrorMalformedType, err, "csr failed signature check")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
var defaultOrderExpiry = time.Hour * 24
|
|
var defaultOrderBackdate = time.Minute
|
|
|
|
// NewOrder ACME api for creating a new order.
|
|
func NewOrder(w http.ResponseWriter, r *http.Request) {
|
|
ctx := r.Context()
|
|
ca := mustAuthority(ctx)
|
|
db := acme.MustDatabaseFromContext(ctx)
|
|
linker := acme.MustLinkerFromContext(ctx)
|
|
|
|
acc, err := accountFromContext(ctx)
|
|
if err != nil {
|
|
render.Error(w, err)
|
|
return
|
|
}
|
|
prov, err := provisionerFromContext(ctx)
|
|
if err != nil {
|
|
render.Error(w, err)
|
|
return
|
|
}
|
|
payload, err := payloadFromContext(ctx)
|
|
if err != nil {
|
|
render.Error(w, err)
|
|
return
|
|
}
|
|
|
|
var nor NewOrderRequest
|
|
if err := json.Unmarshal(payload.value, &nor); err != nil {
|
|
render.Error(w, acme.WrapError(acme.ErrorMalformedType, err,
|
|
"failed to unmarshal new-order request payload"))
|
|
return
|
|
}
|
|
|
|
if err := nor.Validate(); err != nil {
|
|
render.Error(w, err)
|
|
return
|
|
}
|
|
|
|
// TODO(hs): gather all errors, so that we can build one response with ACME subproblems
|
|
// include the nor.Validate() error here too, like in the example in the ACME RFC?
|
|
|
|
acmeProv, err := acmeProvisionerFromContext(ctx)
|
|
if err != nil {
|
|
render.Error(w, err)
|
|
return
|
|
}
|
|
|
|
var eak *acme.ExternalAccountKey
|
|
if acmeProv.RequireEAB {
|
|
if eak, err = db.GetExternalAccountKeyByAccountID(ctx, prov.GetID(), acc.ID); err != nil {
|
|
render.Error(w, acme.WrapErrorISE(err, "error retrieving external account binding key"))
|
|
return
|
|
}
|
|
}
|
|
|
|
acmePolicy, err := newACMEPolicyEngine(eak)
|
|
if err != nil {
|
|
render.Error(w, acme.WrapErrorISE(err, "error creating ACME policy engine"))
|
|
return
|
|
}
|
|
|
|
for _, identifier := range nor.Identifiers {
|
|
// evaluate the ACME account level policy
|
|
if err = isIdentifierAllowed(acmePolicy, identifier); err != nil {
|
|
render.Error(w, acme.WrapError(acme.ErrorRejectedIdentifierType, err, "not authorized"))
|
|
return
|
|
}
|
|
// evaluate the provisioner level policy
|
|
orderIdentifier := provisioner.ACMEIdentifier{Type: provisioner.ACMEIdentifierType(identifier.Type), Value: identifier.Value}
|
|
if err = prov.AuthorizeOrderIdentifier(ctx, orderIdentifier); err != nil {
|
|
render.Error(w, acme.WrapError(acme.ErrorRejectedIdentifierType, err, "not authorized"))
|
|
return
|
|
}
|
|
// evaluate the authority level policy
|
|
if err = ca.AreSANsAllowed(ctx, []string{identifier.Value}); err != nil {
|
|
render.Error(w, acme.WrapError(acme.ErrorRejectedIdentifierType, err, "not authorized"))
|
|
return
|
|
}
|
|
}
|
|
|
|
now := clock.Now()
|
|
// New order.
|
|
o := &acme.Order{
|
|
AccountID: acc.ID,
|
|
ProvisionerID: prov.GetID(),
|
|
Status: acme.StatusPending,
|
|
Identifiers: nor.Identifiers,
|
|
ExpiresAt: now.Add(defaultOrderExpiry),
|
|
AuthorizationIDs: make([]string, len(nor.Identifiers)),
|
|
NotBefore: nor.NotBefore,
|
|
NotAfter: nor.NotAfter,
|
|
}
|
|
|
|
for i, identifier := range o.Identifiers {
|
|
az := &acme.Authorization{
|
|
AccountID: acc.ID,
|
|
Identifier: identifier,
|
|
ExpiresAt: o.ExpiresAt,
|
|
Status: acme.StatusPending,
|
|
}
|
|
if err := newAuthorization(ctx, az); err != nil {
|
|
render.Error(w, err)
|
|
return
|
|
}
|
|
o.AuthorizationIDs[i] = az.ID
|
|
}
|
|
|
|
if o.NotBefore.IsZero() {
|
|
o.NotBefore = now
|
|
}
|
|
if o.NotAfter.IsZero() {
|
|
o.NotAfter = o.NotBefore.Add(prov.DefaultTLSCertDuration())
|
|
}
|
|
// If request NotBefore was empty then backdate the order.NotBefore (now)
|
|
// to avoid timing issues.
|
|
if nor.NotBefore.IsZero() {
|
|
o.NotBefore = o.NotBefore.Add(-defaultOrderBackdate)
|
|
}
|
|
|
|
if err := db.CreateOrder(ctx, o); err != nil {
|
|
render.Error(w, acme.WrapErrorISE(err, "error creating order"))
|
|
return
|
|
}
|
|
|
|
linker.LinkOrder(ctx, o)
|
|
|
|
w.Header().Set("Location", linker.GetLink(ctx, acme.OrderLinkType, o.ID))
|
|
render.JSONStatus(w, o, http.StatusCreated)
|
|
}
|
|
|
|
func isIdentifierAllowed(acmePolicy policy.X509Policy, identifier acme.Identifier) error {
|
|
if acmePolicy == nil {
|
|
return nil
|
|
}
|
|
return acmePolicy.AreSANsAllowed([]string{identifier.Value})
|
|
}
|
|
|
|
func newACMEPolicyEngine(eak *acme.ExternalAccountKey) (policy.X509Policy, error) {
|
|
if eak == nil {
|
|
return nil, nil
|
|
}
|
|
return policy.NewX509PolicyEngine(eak.Policy)
|
|
}
|
|
|
|
func newAuthorization(ctx context.Context, az *acme.Authorization) error {
|
|
if strings.HasPrefix(az.Identifier.Value, "*.") {
|
|
az.Wildcard = true
|
|
az.Identifier = acme.Identifier{
|
|
Value: strings.TrimPrefix(az.Identifier.Value, "*."),
|
|
Type: az.Identifier.Type,
|
|
}
|
|
}
|
|
|
|
chTypes := challengeTypes(az)
|
|
|
|
var err error
|
|
az.Token, err = randutil.Alphanumeric(32)
|
|
if err != nil {
|
|
return acme.WrapErrorISE(err, "error generating random alphanumeric ID")
|
|
}
|
|
|
|
db := acme.MustDatabaseFromContext(ctx)
|
|
az.Challenges = make([]*acme.Challenge, len(chTypes))
|
|
for i, typ := range chTypes {
|
|
ch := &acme.Challenge{
|
|
AccountID: az.AccountID,
|
|
Value: az.Identifier.Value,
|
|
Type: typ,
|
|
Token: az.Token,
|
|
Status: acme.StatusPending,
|
|
}
|
|
if err := db.CreateChallenge(ctx, ch); err != nil {
|
|
return acme.WrapErrorISE(err, "error creating challenge")
|
|
}
|
|
az.Challenges[i] = ch
|
|
}
|
|
if err = db.CreateAuthorization(ctx, az); err != nil {
|
|
return acme.WrapErrorISE(err, "error creating authorization")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// GetOrder ACME api for retrieving an order.
|
|
func GetOrder(w http.ResponseWriter, r *http.Request) {
|
|
ctx := r.Context()
|
|
db := acme.MustDatabaseFromContext(ctx)
|
|
linker := acme.MustLinkerFromContext(ctx)
|
|
|
|
acc, err := accountFromContext(ctx)
|
|
if err != nil {
|
|
render.Error(w, err)
|
|
return
|
|
}
|
|
prov, err := provisionerFromContext(ctx)
|
|
if err != nil {
|
|
render.Error(w, err)
|
|
return
|
|
}
|
|
|
|
o, err := db.GetOrder(ctx, chi.URLParam(r, "ordID"))
|
|
if err != nil {
|
|
render.Error(w, acme.WrapErrorISE(err, "error retrieving order"))
|
|
return
|
|
}
|
|
if acc.ID != o.AccountID {
|
|
render.Error(w, acme.NewError(acme.ErrorUnauthorizedType,
|
|
"account '%s' does not own order '%s'", acc.ID, o.ID))
|
|
return
|
|
}
|
|
if prov.GetID() != o.ProvisionerID {
|
|
render.Error(w, acme.NewError(acme.ErrorUnauthorizedType,
|
|
"provisioner '%s' does not own order '%s'", prov.GetID(), o.ID))
|
|
return
|
|
}
|
|
if err = o.UpdateStatus(ctx, db); err != nil {
|
|
render.Error(w, acme.WrapErrorISE(err, "error updating order status"))
|
|
return
|
|
}
|
|
|
|
linker.LinkOrder(ctx, o)
|
|
|
|
w.Header().Set("Location", linker.GetLink(ctx, acme.OrderLinkType, o.ID))
|
|
render.JSON(w, o)
|
|
}
|
|
|
|
// FinalizeOrder attempts to finalize an order and create a certificate.
|
|
func FinalizeOrder(w http.ResponseWriter, r *http.Request) {
|
|
ctx := r.Context()
|
|
db := acme.MustDatabaseFromContext(ctx)
|
|
linker := acme.MustLinkerFromContext(ctx)
|
|
|
|
acc, err := accountFromContext(ctx)
|
|
if err != nil {
|
|
render.Error(w, err)
|
|
return
|
|
}
|
|
prov, err := provisionerFromContext(ctx)
|
|
if err != nil {
|
|
render.Error(w, err)
|
|
return
|
|
}
|
|
payload, err := payloadFromContext(ctx)
|
|
if err != nil {
|
|
render.Error(w, err)
|
|
return
|
|
}
|
|
var fr FinalizeRequest
|
|
if err := json.Unmarshal(payload.value, &fr); err != nil {
|
|
render.Error(w, acme.WrapError(acme.ErrorMalformedType, err,
|
|
"failed to unmarshal finalize-order request payload"))
|
|
return
|
|
}
|
|
if err := fr.Validate(); err != nil {
|
|
render.Error(w, err)
|
|
return
|
|
}
|
|
|
|
o, err := db.GetOrder(ctx, chi.URLParam(r, "ordID"))
|
|
if err != nil {
|
|
render.Error(w, acme.WrapErrorISE(err, "error retrieving order"))
|
|
return
|
|
}
|
|
if acc.ID != o.AccountID {
|
|
render.Error(w, acme.NewError(acme.ErrorUnauthorizedType,
|
|
"account '%s' does not own order '%s'", acc.ID, o.ID))
|
|
return
|
|
}
|
|
if prov.GetID() != o.ProvisionerID {
|
|
render.Error(w, acme.NewError(acme.ErrorUnauthorizedType,
|
|
"provisioner '%s' does not own order '%s'", prov.GetID(), o.ID))
|
|
return
|
|
}
|
|
|
|
ca := mustAuthority(ctx)
|
|
if err = o.Finalize(ctx, db, fr.csr, ca, prov); err != nil {
|
|
render.Error(w, acme.WrapErrorISE(err, "error finalizing order"))
|
|
return
|
|
}
|
|
|
|
linker.LinkOrder(ctx, o)
|
|
|
|
w.Header().Set("Location", linker.GetLink(ctx, acme.OrderLinkType, o.ID))
|
|
render.JSON(w, o)
|
|
}
|
|
|
|
// challengeTypes determines the types of challenges that should be used
|
|
// for the ACME authorization request.
|
|
func challengeTypes(az *acme.Authorization) []acme.ChallengeType {
|
|
var chTypes []acme.ChallengeType
|
|
|
|
switch az.Identifier.Type {
|
|
case acme.IP:
|
|
chTypes = []acme.ChallengeType{acme.HTTP01, acme.TLSALPN01}
|
|
case acme.DNS:
|
|
chTypes = []acme.ChallengeType{acme.DNS01}
|
|
// HTTP and TLS challenges can only be used for identifiers without wildcards.
|
|
if !az.Wildcard {
|
|
chTypes = append(chTypes, []acme.ChallengeType{acme.HTTP01, acme.TLSALPN01}...)
|
|
}
|
|
case acme.PermanentIdentifier:
|
|
chTypes = []acme.ChallengeType{acme.DEVICEATTEST01}
|
|
default:
|
|
chTypes = []acme.ChallengeType{}
|
|
}
|
|
|
|
return chTypes
|
|
}
|