feat: migrate from Cedar to SpiceDB authorization system

This is a major architectural change that replaces the Cedar policy-based
authorization system with SpiceDB's relation-based authorization.

Key changes:

- Migrate from Rust to Go implementation
- Replace Cedar policies with SpiceDB schema and relationships
- Switch from envoy `ext_authz` with Cedar to SpiceDB permission checks
- Update build system and dependencies for Go ecosystem
- Maintain Envoy integration for external authorization

This change enables more flexible permission modeling through SpiceDB's
Google Zanzibar inspired relation-based system, supporting complex
hierarchical permissions that were difficult to express in Cedar.

Breaking change: Existing Cedar policies and Rust-based configuration
will no longer work and need to be migrated to SpiceDB schema.

10 files changed, 638 insertions, 0 deletions

diff --git a/vendor/github.com/authzed/grpcutil/.golangci.yaml b/vendor/github.com/authzed/grpcutil/.golangci.yaml
new file mode 100644
index 00000000..f1461b4d
--- /dev/null
+++ b/vendor/github.com/authzed/grpcutil/.golangci.yaml
@@ -0,0 +1,37 @@
+---
+run:
+  timeout: '5m'
+output:
+  sort-results: true
+linters-settings:
+  goimports:
+    local-prefixes: 'github.com/authzed/grpcutil'
+linters:
+  enable:
+    - 'bidichk'
+    - 'bodyclose'
+    - 'errcheck'
+    - 'errname'
+    - 'errorlint'
+    - 'gofumpt'
+    - 'goimports'
+    - 'goprintffuncname'
+    - 'gosec'
+    - 'gosimple'
+    - 'govet'
+    - 'importas'
+    - 'ineffassign'
+    - 'makezero'
+    - 'prealloc'
+    - 'predeclared'
+    - 'promlinter'
+    - 'revive'
+    - 'rowserrcheck'
+    - 'staticcheck'
+    - 'stylecheck'
+    - 'tenv'
+    - 'typecheck'
+    - 'unconvert'
+    - 'unused'
+    - 'wastedassign'
+    - 'whitespace'
diff --git a/vendor/github.com/authzed/grpcutil/.yamllint b/vendor/github.com/authzed/grpcutil/.yamllint
new file mode 100644
index 00000000..9c1e7e32
--- /dev/null
+++ b/vendor/github.com/authzed/grpcutil/.yamllint
@@ -0,0 +1,10 @@
+# vim: ft=yaml
+---
+yaml-files:
+  - "*.yaml"
+  - "*.yml"
+  - ".yamllint"
+extends: "default"
+rules:
+  quoted-strings: "enable"
+  line-length: "disable"
diff --git a/vendor/github.com/authzed/grpcutil/DCO b/vendor/github.com/authzed/grpcutil/DCO
new file mode 100644
index 00000000..8201f992
--- /dev/null
+++ b/vendor/github.com/authzed/grpcutil/DCO
@@ -0,0 +1,37 @@
+Developer Certificate of Origin
+Version 1.1
+
+Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
+1 Letterman Drive
+Suite D4700
+San Francisco, CA, 94129
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
+
+
+Developer's Certificate of Origin 1.1
+
+By making a contribution to this project, I certify that:
+
+(a) The contribution was created in whole or in part by me and I
+    have the right to submit it under the open source license
+    indicated in the file; or
+
+(b) The contribution is based upon previous work that, to the best
+    of my knowledge, is covered under an appropriate open source
+    license and I have the right under that license to submit that
+    work with modifications, whether created in whole or in part
+    by me, under the same open source license (unless I am
+    permitted to submit under a different license), as indicated
+    in the file; or
+
+(c) The contribution was provided directly to me by some other
+    person who certified (a), (b) or (c) and I have not modified
+    it.
+
+(d) I understand and agree that this project and the contribution
+    are public and that a record of the contribution (including all
+    personal information I submit with it, including my sign-off) is
+    maintained indefinitely and may be redistributed consistent with
+    this project or the open source license(s) involved.
diff --git a/vendor/github.com/authzed/grpcutil/LICENSE b/vendor/github.com/authzed/grpcutil/LICENSE
new file mode 100644
index 00000000..261eeb9e
--- /dev/null
+++ b/vendor/github.com/authzed/grpcutil/LICENSE
@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
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+      outstanding shares, or (iii) beneficial ownership of such entity.
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+      "You" (or "Your") shall mean an individual or Legal Entity
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+          notices within Derivative Works that You distribute, alongside
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+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
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+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
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+      other commercial damages or losses), even if such Contributor
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+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
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+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
diff --git a/vendor/github.com/authzed/grpcutil/README.md b/vendor/github.com/authzed/grpcutil/README.md
new file mode 100644
index 00000000..f0b37669
--- /dev/null
+++ b/vendor/github.com/authzed/grpcutil/README.md
@@ -0,0 +1,5 @@
+# grpcutil
+
+[![GoDoc](https://godoc.org/github.com/authzed/grpcutil?status.svg)](https://godoc.org/github.com/authzed/grpcutil)
+
+grpcutil implements various utilities to simplify common gRPC APIs.
diff --git a/vendor/github.com/authzed/grpcutil/buf.gen.yaml b/vendor/github.com/authzed/grpcutil/buf.gen.yaml
new file mode 100644
index 00000000..729faeaf
--- /dev/null
+++ b/vendor/github.com/authzed/grpcutil/buf.gen.yaml
@@ -0,0 +1,12 @@
+#!/usr/bin/env -S go run github.com/bufbuild/buf/cmd/buf generate -o internal/testpb internal/testpb/test.proto --template
+---
+version: "v1"
+plugins:
+  - name: 'go'
+    path: ["go", "run", "google.golang.org/protobuf/cmd/protoc-gen-go"]
+    out: '.'
+    opt: 'paths=source_relative'
+  - name: 'go-grpc'
+    out: '.'
+    path: ["go", "run", "google.golang.org/grpc/cmd/protoc-gen-go-grpc"]
+    opt: 'paths=source_relative'
diff --git a/vendor/github.com/authzed/grpcutil/dial_opts.go b/vendor/github.com/authzed/grpcutil/dial_opts.go
new file mode 100644
index 00000000..68369d40
--- /dev/null
+++ b/vendor/github.com/authzed/grpcutil/dial_opts.go
@@ -0,0 +1,149 @@
+// Package grpcutil implements various utilities to simplify common gRPC APIs.
+package grpcutil
+
+import (
+	"context"
+	"crypto/tls"
+	"crypto/x509"
+	"errors"
+	"fmt"
+	"io/fs"
+	"os"
+
+	"github.com/certifi/gocertifi"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials"
+)
+
+type verification int
+
+const (
+	// SkipVerifyCA is a constant that improves the readability of functions
+	// with the insecureSkipVerify parameter.
+	SkipVerifyCA verification = iota
+
+	// VerifyCA is a constant that improves the readability of functions
+	// with the insecureSkipVerify parameter.
+	VerifyCA
+)
+
+func (v verification) asInsecureSkipVerify() bool {
+	switch v {
+	case SkipVerifyCA:
+		return true
+	case VerifyCA:
+		return false
+	default:
+		panic("unknown verification")
+	}
+}
+
+// WithSystemCerts returns a grpc.DialOption that uses the system-provided
+// certificate authority chain to verify the connection.
+//
+// If one cannot be found, this falls back to using a vendored version of
+// Mozilla's collection of root certificate authorities.
+func WithSystemCerts(v verification) (grpc.DialOption, error) {
+	certPool, err := x509.SystemCertPool()
+	if err != nil {
+		// Fall back to Mozilla collection of root CAs.
+		certPool, err = gocertifi.CACerts()
+		if err != nil {
+			// This library promises that this should never occur.
+			return nil, fmt.Errorf("gocertifi returned an error: %w", err)
+		}
+	}
+
+	return grpc.WithTransportCredentials(credentials.NewTLS(&tls.Config{
+		RootCAs:            certPool,
+		InsecureSkipVerify: v.asInsecureSkipVerify(), // nolint
+	})), nil
+}
+
+func forEachFileContents(dirPath string, fn func(contents []byte)) error {
+	dirFS := os.DirFS(dirPath)
+	return fs.WalkDir(dirFS, ".", func(path string, d fs.DirEntry, err error) error {
+		if !d.IsDir() {
+			contents, err := fs.ReadFile(dirFS, d.Name())
+			if err != nil {
+				return err
+			}
+			fn(contents)
+		}
+		return nil
+	})
+}
+
+// WithCustomCerts returns a grpc.DialOption for requiring TLS that is
+// authenticated using a certificate authority chain provided as a path on disk.
+//
+// If the path is a directory, all files are loaded.
+func WithCustomCerts(v verification, certPaths ...string) (grpc.DialOption, error) {
+	var caFiles [][]byte
+	for _, certPath := range certPaths {
+		fi, err := os.Stat(certPath)
+		if err != nil {
+			return nil, fmt.Errorf("failed to find certificate: %w", err)
+		}
+
+		if fi.IsDir() {
+			if err = forEachFileContents(certPath, func(contents []byte) {
+				caFiles = append(caFiles, contents)
+			}); err != nil {
+				return nil, err
+			}
+		} else {
+			contents, err := os.ReadFile(certPath)
+			if err != nil {
+				return nil, err
+			}
+			caFiles = append(caFiles, contents)
+		}
+	}
+
+	return WithCustomCertBytes(v, caFiles...)
+}
+
+// WithCustomCertBytes returns a grpc.DialOption for requiring TLS that is
+// authenticated using a certificate authority chain provided in bytes.
+func WithCustomCertBytes(v verification, certsContents ...[]byte) (grpc.DialOption, error) {
+	certPool := x509.NewCertPool()
+	for _, certContents := range certsContents {
+		if ok := certPool.AppendCertsFromPEM(certContents); !ok {
+			return nil, errors.New("failed to append certs from CA PEM")
+		}
+	}
+
+	return grpc.WithTransportCredentials(credentials.NewTLS(&tls.Config{
+		RootCAs:            certPool,
+		InsecureSkipVerify: v.asInsecureSkipVerify(), // nolint:gosec
+	})), nil
+}
+
+type secureMetadataCreds map[string]string
+
+func (c secureMetadataCreds) RequireTransportSecurity() bool { return true }
+func (c secureMetadataCreds) GetRequestMetadata(context.Context, ...string) (map[string]string, error) {
+	return c, nil
+}
+
+// WithBearerToken returns a grpc.DialOption that adds a standard HTTP Bearer
+// token to all requests sent from a client.
+func WithBearerToken(token string) grpc.DialOption {
+	return grpc.WithPerRPCCredentials(secureMetadataCreds{"authorization": "Bearer " + token})
+}
+
+type insecureMetadataCreds map[string]string
+
+func (c insecureMetadataCreds) RequireTransportSecurity() bool { return false }
+func (c insecureMetadataCreds) GetRequestMetadata(_ context.Context, _ ...string) (map[string]string, error) {
+	return c, nil
+}
+
+// WithInsecureBearerToken returns a grpc.DialOption that adds a standard HTTP
+// Bearer token to all requests sent from an insecure client.
+//
+// Must be used in conjunction with `insecure.NewCredentials()`.
+func WithInsecureBearerToken(token string) grpc.DialOption {
+	return grpc.WithPerRPCCredentials(insecureMetadataCreds{"authorization": "Bearer " + token})
+}
diff --git a/vendor/github.com/authzed/grpcutil/middleware.go b/vendor/github.com/authzed/grpcutil/middleware.go
new file mode 100644
index 00000000..052367af
--- /dev/null
+++ b/vendor/github.com/authzed/grpcutil/middleware.go
@@ -0,0 +1,118 @@
+package grpcutil
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	grpcmw "github.com/grpc-ecosystem/go-grpc-middleware"
+	grpc_auth "github.com/grpc-ecosystem/go-grpc-middleware/auth"
+	grpcvalidate "github.com/grpc-ecosystem/go-grpc-middleware/validator"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/health"
+	healthpb "google.golang.org/grpc/health/grpc_health_v1"
+)
+
+// IgnoreAuthMixin is a struct that can be embedded to make a gRPC handler
+// ignore any auth requirements set by the gRPC community auth middleware.
+type IgnoreAuthMixin struct{}
+
+var _ grpc_auth.ServiceAuthFuncOverride = (*IgnoreAuthMixin)(nil)
+
+// AuthFuncOverride implements the grpc_auth.ServiceAuthFuncOverride by
+// performing a no-op.
+func (m IgnoreAuthMixin) AuthFuncOverride(ctx context.Context, _ string) (context.Context, error) {
+	return ctx, nil
+}
+
+// AuthlessHealthServer implements a gRPC health endpoint that will ignore any auth
+// requirements set by github.com/grpc-ecosystem/go-grpc-middleware/auth.
+type AuthlessHealthServer struct {
+	*health.Server
+	IgnoreAuthMixin
+}
+
+// NewAuthlessHealthServer returns a new gRPC health server that ignores auth
+// middleware.
+func NewAuthlessHealthServer() *AuthlessHealthServer {
+	return &AuthlessHealthServer{Server: health.NewServer()}
+}
+
+// SetServicesHealthy sets the service to SERVING
+func (s *AuthlessHealthServer) SetServicesHealthy(svcDesc ...*grpc.ServiceDesc) {
+	for _, d := range svcDesc {
+		s.SetServingStatus(
+			d.ServiceName,
+			healthpb.HealthCheckResponse_SERVING,
+		)
+	}
+}
+
+// DefaultUnaryMiddleware is a recommended set of middleware that should each gracefully no-op if the middleware is not
+// applicable.
+var DefaultUnaryMiddleware = []grpc.UnaryServerInterceptor{grpcvalidate.UnaryServerInterceptor()}
+
+// WrapMethods wraps all non-streaming endpoints with the given list of interceptors.
+// It returns a copy of the ServiceDesc with the new wrapped methods.
+func WrapMethods(svcDesc grpc.ServiceDesc, interceptors ...grpc.UnaryServerInterceptor) (wrapped *grpc.ServiceDesc) {
+	chain := grpcmw.ChainUnaryServer(interceptors...)
+	for i, m := range svcDesc.Methods {
+		handler := m.Handler
+		wrapped := grpc.MethodDesc{
+			MethodName: m.MethodName,
+			Handler: func(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+				if interceptor == nil {
+					interceptor = NoopUnaryInterceptor
+				}
+				return handler(srv, ctx, dec, grpcmw.ChainUnaryServer(interceptor, chain))
+			},
+		}
+		svcDesc.Methods[i] = wrapped
+	}
+	return &svcDesc
+}
+
+// WrapStreams wraps all streaming endpoints with the given list of interceptors.
+// It returns a copy of the ServiceDesc with the new wrapped methods.
+func WrapStreams(svcDesc grpc.ServiceDesc, interceptors ...grpc.StreamServerInterceptor) (wrapped *grpc.ServiceDesc) {
+	chain := grpcmw.ChainStreamServer(interceptors...)
+	for i, s := range svcDesc.Streams {
+		handler := s.Handler
+		info := &grpc.StreamServerInfo{
+			FullMethod:     fmt.Sprintf("/%s/%s", svcDesc.ServiceName, s.StreamName),
+			IsClientStream: s.ClientStreams,
+			IsServerStream: s.ServerStreams,
+		}
+		wrapped := grpc.StreamDesc{
+			StreamName:    s.StreamName,
+			ClientStreams: s.ClientStreams,
+			ServerStreams: s.ServerStreams,
+			Handler: func(srv interface{}, stream grpc.ServerStream) error {
+				return chain(srv, stream, info, handler)
+			},
+		}
+		svcDesc.Streams[i] = wrapped
+	}
+	return &svcDesc
+}
+
+// NoopUnaryInterceptor is a gRPC middleware that does not do anything.
+func NoopUnaryInterceptor(ctx context.Context, req interface{}, _ *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp interface{}, err error) {
+	return handler(ctx, req)
+}
+
+// SplitMethodName is used to split service name and method name from the
+// method string passed into Interceptors.
+//
+// This function is vendored from:
+// https://github.com/grpc-ecosystem/go-grpc-prometheus/blob/82c243799c991a7d5859215fba44a81834a52a71/util.go#L31-L37
+//
+// Copyright 2016 Michal Witkowski. All Rights Reserved.
+// Apache 2.0 Licensed
+func SplitMethodName(fullMethodName string) (string, string) {
+	fullMethodName = strings.TrimPrefix(fullMethodName, "/") // remove leading slash
+	if i := strings.Index(fullMethodName, "/"); i >= 0 {
+		return fullMethodName[:i], fullMethodName[i+1:]
+	}
+	return "unknown", "unknown"
+}
diff --git a/vendor/github.com/authzed/grpcutil/reflection.go b/vendor/github.com/authzed/grpcutil/reflection.go
new file mode 100644
index 00000000..092b5680
--- /dev/null
+++ b/vendor/github.com/authzed/grpcutil/reflection.go
@@ -0,0 +1,51 @@
+package grpcutil
+
+import (
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/reflection"
+	rpbv1 "google.golang.org/grpc/reflection/grpc_reflection_v1"
+	"google.golang.org/grpc/reflection/grpc_reflection_v1alpha"
+)
+
+// NewAuthlessReflectionInterceptor creates a proxy GRPCServer which automatically converts
+// ServerReflectionServer instances to ones that skip grpc auth middleware.
+//
+// change:
+// reflection.Register(srv)
+// to:
+// reflection.Register(grpcutil.NewAuthlessReflectionInterceptor(srv))
+func NewAuthlessReflectionInterceptor(srv reflection.GRPCServer) reflection.GRPCServer {
+	return interceptingRegistrar{srv}
+}
+
+type interceptingRegistrar struct {
+	delegate reflection.GRPCServer
+}
+
+func (ir interceptingRegistrar) GetServiceInfo() map[string]grpc.ServiceInfo {
+	return ir.delegate.GetServiceInfo()
+}
+
+func (ir interceptingRegistrar) RegisterService(desc *grpc.ServiceDesc, impl interface{}) {
+	reflectionSrvv1, ok := impl.(rpbv1.ServerReflectionServer)
+	if ok {
+		ir.delegate.RegisterService(desc, &authlessReflectionV1{ServerReflectionServer: reflectionSrvv1})
+	}
+
+	reflectionSrvv1alpha, ok := impl.(grpc_reflection_v1alpha.ServerReflectionServer)
+	if ok {
+		ir.delegate.RegisterService(desc, &authlessReflectionV1Alpha{ServerReflectionServer: reflectionSrvv1alpha})
+	}
+}
+
+type authlessReflectionV1 struct {
+	IgnoreAuthMixin
+
+	rpbv1.ServerReflectionServer
+}
+
+type authlessReflectionV1Alpha struct {
+	IgnoreAuthMixin
+
+	grpc_reflection_v1alpha.ServerReflectionServer
+}
diff --git a/vendor/github.com/authzed/grpcutil/util.go b/vendor/github.com/authzed/grpcutil/util.go
new file mode 100644
index 00000000..65bb3bd5
--- /dev/null
+++ b/vendor/github.com/authzed/grpcutil/util.go
@@ -0,0 +1,18 @@
+package grpcutil
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+// RequireStatus asserts that an error is a gRPC error and returns the expected
+// status code.
+func RequireStatus(t *testing.T, expected codes.Code, err error) {
+	require.Error(t, err)
+	errStatus, ok := status.FromError(err)
+	require.True(t, ok)
+	require.Equal(t, expected, errStatus.Code())
+}