coordinator: add POST /v1/manifest handler

apitypes/manifest.go

@@ -0,0 +1,49 @@
+// Copyright 2026 Edgeless Systems GmbH
+// SPDX-License-Identifier: BUSL-1.1
+
+package apitypes
+
+// SetManifestRequest is the request body of POST /v1/manifest.
+type SetManifestRequest struct {
+	// Manifest is the JSON-encoded manifest to set.
+	Manifest []byte `json:"manifest"`
+	// Policies are the policies referenced by the manifest.
+	Policies [][]byte `json:"policies"`
+	// PreviousTransitionHash is the expected hash of the latest transition, used for
+	// compare-and-swap. If unset, the update is not conditional.
+	PreviousTransitionHash []byte `json:"previous_transition_hash,omitempty"`
+	// Signature is the workload owner's signature over the manifest.
+	//
+	// Over HTTP this is the only supported way to authorize an update to an existing
+	// manifest, because the Coordinator can't authenticate the caller by its client
+	// certificate as it does for aTLS-based gRPC calls.
+	Signature []byte `json:"signature,omitempty"`
+}
+
+// SetManifestResponse is the response body of POST /v1/manifest.
+type SetManifestResponse struct {
+	// Version is the Coordinator version.
+	Version string `json:"version"`
+	// RootCA is the PEM-encoded certificate of the deployment's root CA.
+	RootCA []byte `json:"root_ca"`
+	// MeshCA is the PEM-encoded certificate of the deployment's mesh CA.
+	MeshCA []byte `json:"mesh_ca"`
+	// SeedSharesDoc is only set when the initial manifest was set.
+	SeedSharesDoc *SeedShareDocument `json:"seed_shares_doc,omitempty"`
+}
+
+// SeedShareDocument contains the secret seed, encrypted for the seedshare owners.
+type SeedShareDocument struct {
+	// SeedShares holds the seed, encrypted once per seedshare owner.
+	SeedShares []SeedShare `json:"seed_shares"`
+	// Salt is used together with the seed to derive the Coordinator's secrets.
+	Salt []byte `json:"salt"`
+}
+
+// SeedShare is the secret seed, encrypted with a single seedshare owner's public key.
+type SeedShare struct {
+	// PublicKey is the hex-encoded public key of the seedshare owner.
+	PublicKey string `json:"public_key"`
+	// EncryptedSeed is the seed, encrypted with PublicKey.
+	EncryptedSeed []byte `json:"encrypted_seed"`
+}

coordinator/internal/httpapi/attest.go

@@ -19,6 +19,7 @@ import (
 	"github.com/edgelesssys/contrast/internal/atls"
 	"github.com/edgelesssys/contrast/internal/constants"
 	"github.com/edgelesssys/contrast/internal/manifest"
+	"google.golang.org/grpc/status"
 )
 
 var (
@@ -142,15 +143,18 @@ func (h *AttestationHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
-func writeJSONError(w http.ResponseWriter, status int, err error) {
+func writeJSONError(w http.ResponseWriter, statusCode int, err error) {
 	log.Print(err.Error())
 
 	w.Header().Set("Content-Type", "application/json")
-	w.WriteHeader(status)
-
-	apiErr := &apitypes.AttestationError{
-		Version: constants.Version,
-		Err:     err.Error(),
+	w.WriteHeader(statusCode)
+
+	apiErr := &apitypes.APIError{
+		Version:    constants.Version,
+		StatusCode: statusCode,
+		// Unwrap gRPC status errors, so that clients don't see the gRPC framing of an
+		// error that didn't travel over gRPC. For other errors, this is err.Error().
+		Err: status.Convert(err).Message(),
 	}
 	if errEncode := json.NewEncoder(w).Encode(apiErr); errEncode != nil {
 		log.Printf("encoding error response %v failed: %v", err, errEncode)

coordinator/internal/httpapi/attest_test.go

@@ -169,6 +169,7 @@ func TestAttestationHandler(t *testing.T) {
 				var apiErr apitypes.AttestationError
 				require.NoError(json.NewDecoder(res.Body).Decode(&apiErr))
 				require.Contains(apiErr.Err, tc.expErr.Error())
+				require.Equal(tc.expStatus, apiErr.StatusCode)
 			} else if res.StatusCode == http.StatusOK {
 				var resp apitypes.AttestationResponse
 				require.NoError(json.NewDecoder(res.Body).Decode(&resp))

coordinator/internal/httpapi/manifest.go

@@ -0,0 +1,133 @@
+// Copyright 2026 Edgeless Systems GmbH
+// SPDX-License-Identifier: BUSL-1.1
+
+package httpapi
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"io"
+	"mime"
+	"net/http"
+
+	"github.com/edgelesssys/contrast/apitypes"
+	"github.com/edgelesssys/contrast/internal/constants"
+	"github.com/edgelesssys/contrast/internal/userapi"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+// maxSetManifestBodySize limits the accepted request body size. A manifest and its policies
+// are much smaller than this, but they're the largest input the Coordinator accepts.
+const maxSetManifestBodySize = 16 << 20 // 16 MiB
+
+// ManifestSetter sets a manifest. It is a *userapi.Server at runtime, but can be stubbed in tests.
+type ManifestSetter interface {
+	SetManifest(context.Context, *userapi.SetManifestRequest) (*userapi.SetManifestResponse, error)
+}
+
+// SetManifestHandler handles POST requests to /v1/manifest.
+//
+// It's a thin translation layer in front of the gRPC UserAPI's SetManifest: the request is
+// converted to its protobuf equivalent, handled by the same server logic, and the response is
+// converted back to JSON.
+type SetManifestHandler struct {
+	UserAPI ManifestSetter
+}
+
+// ServeHTTP implements [http.Handler].
+func (h *SetManifestHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		w.WriteHeader(http.StatusMethodNotAllowed)
+		return
+	}
+
+	contentType := r.Header.Get("Content-Type")
+	mediaType, _, err := mime.ParseMediaType(contentType)
+	if err != nil {
+		writeJSONError(w, http.StatusBadRequest, err)
+		return
+	}
+	if mediaType != "application/json" {
+		writeJSONError(w, http.StatusUnsupportedMediaType, errContentType)
+		return
+	}
+
+	bodyReader := http.MaxBytesReader(w, r.Body, maxSetManifestBodySize)
+	defer bodyReader.Close()
+	body, err := io.ReadAll(bodyReader)
+	if err != nil {
+		var maxBytesErr *http.MaxBytesError
+		if errors.As(err, &maxBytesErr) {
+			writeJSONError(w, http.StatusRequestEntityTooLarge, maxBytesErr)
+			return
+		}
+		writeJSONError(w, http.StatusBadRequest, err)
+		return
+	}
+
+	var req apitypes.SetManifestRequest
+	if err := json.Unmarshal(body, &req); err != nil {
+		writeJSONError(w, http.StatusBadRequest, err)
+		return
+	}
+
+	resp, err := h.UserAPI.SetManifest(r.Context(), &userapi.SetManifestRequest{
+		Manifest:               req.Manifest,
+		Policies:               req.Policies,
+		PreviousTransitionHash: req.PreviousTransitionHash,
+		Signature:              req.Signature,
+	})
+	if err != nil {
+		writeJSONError(w, httpStatusFromGRPC(err), err)
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	enc := json.NewEncoder(w)
+	enc.SetEscapeHTML(false)
+	if err := enc.Encode(setManifestResponse(resp)); err != nil {
+		writeJSONError(w, http.StatusInternalServerError, err)
+	}
+}
+
+// setManifestResponse converts the gRPC response to its wire-format equivalent.
+func setManifestResponse(resp *userapi.SetManifestResponse) *apitypes.SetManifestResponse {
+	out := &apitypes.SetManifestResponse{
+		Version: constants.Version,
+		RootCA:  resp.GetRootCA(),
+		MeshCA:  resp.GetMeshCA(),
+	}
+	doc := resp.GetSeedSharesDoc()
+	if doc == nil {
+		return out
+	}
+
+	shares := make([]apitypes.SeedShare, 0, len(doc.GetSeedShares()))
+	for _, share := range doc.GetSeedShares() {
+		shares = append(shares, apitypes.SeedShare{
+			PublicKey:     share.GetPublicKey(),
+			EncryptedSeed: share.GetEncryptedSeed(),
+		})
+	}
+	out.SeedSharesDoc = &apitypes.SeedShareDocument{
+		SeedShares: shares,
+		Salt:       doc.GetSalt(),
+	}
+	return out
+}
+
+// httpStatusFromGRPC maps the gRPC status codes returned by the UserAPI to HTTP status codes.
+func httpStatusFromGRPC(err error) int {
+	switch status.Code(err) {
+	case codes.InvalidArgument:
+		return http.StatusBadRequest
+	case codes.PermissionDenied:
+		return http.StatusForbidden
+	case codes.FailedPrecondition:
+		return http.StatusPreconditionFailed
+	default:
+		return http.StatusInternalServerError
+	}
+}