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setup.go
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setup.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package main
import (
"context"
"crypto/rand"
"encoding/base64"
"fmt"
"io/fs"
"path/filepath"
"strings"
"google.golang.org/protobuf/encoding/protojson"
"google.golang.org/protobuf/encoding/prototext"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/types/known/anypb"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
applycorev1 "k8s.io/client-go/applyconfigurations/core/v1"
"namespacelabs.dev/foundation/framework/kubernetes/kubedef"
"namespacelabs.dev/foundation/framework/kubernetes/kubetool"
"namespacelabs.dev/foundation/framework/provisioning"
"namespacelabs.dev/foundation/internal/bytestream"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/internal/fnfs"
"namespacelabs.dev/foundation/internal/keys"
fnsecrets "namespacelabs.dev/foundation/internal/secrets"
"namespacelabs.dev/foundation/schema"
"namespacelabs.dev/foundation/std/secrets"
"namespacelabs.dev/foundation/std/types"
"namespacelabs.dev/go-ids"
)
type tool struct{}
func main() {
h := provisioning.NewHandlers()
henv := h.MatchEnv(&schema.Environment{Runtime: "kubernetes"})
henv.HandleStack(tool{})
provisioning.Handle(h)
}
func (tool) Apply(ctx context.Context, r provisioning.StackRequest, out *provisioning.ApplyOutput) error {
kr, err := kubetool.FromRequest(r)
if err != nil {
return err
}
collection, err := secrets.Collect(r.Focus.Server)
if err != nil {
return err
}
data, err := fillData(ctx, r.Focus.Server, r.Env, collection, r)
if err != nil {
return err
}
devMapBytes, err := prototext.Marshal(collection.DevMap)
if err != nil {
return err
}
devMapBinaryBytes, err := proto.Marshal(collection.DevMap)
if err != nil {
return err
}
devMapJSON, err := protojson.Marshal(collection.DevMap)
if err != nil {
return err
}
if data == nil {
data = map[string][]byte{}
}
// We do something funky here, we keep the mapping as a secret, so that
// k8s also maps it to the container's namespace, and we can load it
// using our regular mechanisms. Within that dev map, we map each
// secret to other files mounted as well.
data["map.textpb"] = devMapBytes
// Servers use the binary serialized version.
data["map.binarypb"] = devMapBinaryBytes
// We also include a JSON version of the map to facilitiate JS-based uses.
data["map.json"] = devMapJSON
serverSecretName := secrets.ServerSecretName(r.Focus.Server)
out.Invocations = append(out.Invocations, kubedef.Apply{
Description: "server secrets",
SetNamespace: kr.CanSetNamespace,
Resource: applycorev1.
Secret(serverSecretName, kr.Namespace).
WithType(v1.SecretTypeOpaque).
WithAnnotations(kubedef.MakeAnnotations(r.Env, r.Focus.GetPackageName())).
WithLabels(kubedef.MakeLabels(r.Env, r.Focus.Server)).
WithData(data),
})
volId := fmt.Sprintf("fn-secrets-%s", r.Focus.Server.Id)
out.Extensions = append(out.Extensions, kubedef.ExtendSpec{
With: &kubedef.SpecExtension{
Volume: []*kubedef.SpecExtension_Volume{{
Name: volId,
VolumeType: &kubedef.SpecExtension_Volume_Secret_{
Secret: &kubedef.SpecExtension_Volume_Secret{
SecretName: serverSecretName,
},
},
}},
}})
var envVars []*schema.BinaryConfig_EnvEntry
for j, user := range collection.UserManaged {
for k, x := range user {
if x.ExperimentalMountAsEnvVar != "" {
envVars = append(envVars, &schema.BinaryConfig_EnvEntry{
Name: x.ExperimentalMountAsEnvVar,
ExperimentalFromSecret: fmt.Sprintf("%s:%s", serverSecretName, collection.Names[j][k]),
})
}
}
}
for _, gen := range collection.Generated {
if gen.Secret.ExperimentalMountAsEnvVar != "" {
envVars = append(envVars, &schema.BinaryConfig_EnvEntry{
Name: gen.Secret.ExperimentalMountAsEnvVar,
ExperimentalFromSecret: fmt.Sprintf("%s:%s", gen.ResourceName, gen.Secret.Name),
})
}
}
out.Extensions = append(out.Extensions, kubedef.ExtendContainer{
With: &kubedef.ContainerExtension{
Env: envVars,
VolumeMount: []*kubedef.ContainerExtension_VolumeMount{{
Name: volId,
ReadOnly: true,
MountPath: secrets.MountPath,
MountOnInit: true, // Allow secret access during server initialization
}},
}})
for _, gen := range collection.Generated {
generatedName := gen.ResourceName
volId := "fn-secret-" + gen.ID
out.Extensions = append(out.Extensions, kubedef.ExtendSpec{
With: &kubedef.SpecExtension{
Volume: []*kubedef.SpecExtension_Volume{{
Name: volId,
VolumeType: &kubedef.SpecExtension_Volume_Secret_{
Secret: &kubedef.SpecExtension_Volume_Secret{
SecretName: generatedName,
},
},
}},
}})
out.Extensions = append(out.Extensions, kubedef.ExtendContainer{
With: &kubedef.ContainerExtension{
VolumeMount: []*kubedef.ContainerExtension_VolumeMount{{
Name: volId,
ReadOnly: true,
MountPath: gen.Path,
MountOnInit: true, // Allow secret access during server initialization
}},
}})
switch {
case gen.Secret.InitializeWith != nil:
src := &schema.SerializedInvocationSource{
Description: "Generated server secrets",
}
create := &kubedef.OpCreateSecretConditionally{
Namespace: kr.Namespace,
SetNamespace: kr.CanSetNamespace,
Name: generatedName,
UserSpecifiedName: gen.Secret.Name,
}
var err error
src.Impl, err = anypb.New(create)
if err != nil {
return err
}
resource, err := anypb.New(&types.DeferredResource{FromInvocation: gen.Secret.InitializeWith})
if err != nil {
return err
}
src.Computable = append(src.Computable, &schema.SerializedInvocationSource_ComputableValue{
Name: "value",
Value: resource,
})
out.InvocationSources = append(out.InvocationSources, src)
case gen.Secret.SelfSignedTlsCertificate != nil:
src := &schema.SerializedInvocationSource{
Description: "Generated self-signed certificate bundle",
}
create := &kubedef.OpCreateSecretConditionally{
Namespace: kr.Namespace,
SetNamespace: kr.CanSetNamespace,
Name: generatedName,
UserSpecifiedName: gen.Secret.Name,
SelfSignedCertificate: gen.Secret.SelfSignedTlsCertificate,
}
var err error
src.Impl, err = anypb.New(create)
if err != nil {
return err
}
out.InvocationSources = append(out.InvocationSources, src)
default:
data := map[string][]byte{}
switch gen.Secret.Generate.Format {
case secrets.GenerateSpecification_FORMAT_BASE32:
data[gen.Secret.Name] = []byte(ids.NewRandomBase32ID(int(gen.Secret.Generate.RandomByteCount)))
default: // Including BASE64
raw := make([]byte, gen.Secret.Generate.RandomByteCount)
_, _ = rand.Reader.Read(raw)
data[gen.Secret.Name] = []byte(base64.RawStdEncoding.EncodeToString(raw))
}
out.Invocations = append(out.Invocations, kubedef.Create{
Description: "Generated server secrets",
SetNamespace: kr.CanSetNamespace,
SkipIfAlreadyExists: true,
Resource: "secrets",
Body: &v1.Secret{
TypeMeta: metav1.TypeMeta{
Kind: "Secret",
APIVersion: "v1",
},
ObjectMeta: metav1.ObjectMeta{
Name: generatedName,
Namespace: kr.Namespace,
Labels: kubedef.MakeLabels(r.Env, nil),
},
Data: data,
},
})
}
}
// The required secrets are then mounted to /secrets, where this extension can
// pick them up. A map.textpb is also synthesized.
if r.Focus.Server.Framework == schema.Framework_GO {
out.Extensions = append(out.Extensions, kubedef.ExtendContainer{
With: &kubedef.ContainerExtension{
Args: []string{
"--server_secrets_basepath=/secrets/server",
},
},
})
}
return nil
}
func (tool) Delete(ctx context.Context, r provisioning.StackRequest, out *provisioning.DeleteOutput) error {
kr, err := kubetool.FromRequest(r)
if err != nil {
return err
}
out.Invocations = append(out.Invocations, kubedef.Delete{
Description: "server secrets",
Resource: "secrets",
SetNamespace: kr.CanSetNamespace,
Namespace: kr.Namespace,
Name: secrets.ServerSecretName(r.Focus.Server),
})
return nil
}
func fillData(ctx context.Context, server *schema.Server, env *schema.Environment, col *secrets.Collection, r provisioning.StackRequest) (map[string][]byte, error) {
var count int
for _, userManaged := range col.UserManaged {
count += len(userManaged)
}
if count == 0 {
return nil, nil
}
snapshotKeys := r.Snapshots[keys.SnapshotKeys]
contentSnapshots := map[string]fs.FS{}
for key, snapshot := range r.Snapshots {
if key != keys.SnapshotKeys {
contentSnapshots[key] = snapshot
}
}
var bundles []*fnsecrets.Bundle
var bundleNames []string
for _, snapshot := range contentSnapshots {
if err := fnfs.VisitFiles(ctx, snapshot, func(path string, blob bytestream.ByteStream, de fs.DirEntry) error {
if filepath.Ext(path) != ".secrets" {
return nil
}
if snapshotKeys == nil {
return fmt.Errorf("can't use encrypted secrets without keys")
}
contents, err := bytestream.ReadAll(blob)
if err != nil {
return err
}
bundle, err := fnsecrets.LoadBundle(ctx, snapshotKeys, contents)
if err != nil {
return err
}
bundles = append(bundles, bundle)
if sliceContains(bundleNames, path) {
return fnerrors.InternalError("multiple secret bundles with the same name? saw: %s", strings.Join(bundleNames, "; "))
}
bundleNames = append(bundleNames, path)
return nil
}); err != nil {
return nil, err
}
}
data := map[string][]byte{}
for k, userManaged := range col.UserManaged {
for j, secret := range userManaged {
var foundValue []byte
var foundIn []string
key := &fnsecrets.ValueKey{PackageName: col.InstanceOwners[k], Key: secret.Name, EnvironmentName: env.Name}
for idx, bundle := range bundles {
value, err := bundle.Lookup(ctx, key)
if err != nil {
return nil, err
}
if value != nil {
foundValue = value
foundIn = append(foundIn, bundleNames[idx])
}
}
switch len(foundIn) {
case 0:
if !secret.Optional {
return nil, fnerrors.UsageError(
fmt.Sprintf("Try running `ns secrets set %s --secret %s:%s`", server.PackageName, key.PackageName, key.Key),
"secret %q required by %q not specified", key.Key, key.PackageName)
} else {
// XXX should not mutate DevMap here.
for _, x := range col.DevMap.Configure {
if x.PackageName == key.PackageName {
for k, s := range x.Secret {
if s.Name == secret.Name {
x.Secret[k] = nil
}
}
}
}
}
case 1:
data[col.Names[k][j]] = foundValue
default:
return nil, fnerrors.NewWithLocation(server, "%s: secret %s:%s found in multiple files: %s",
server.PackageName, key.PackageName, key.Key, strings.Join(foundIn, "; "))
}
}
}
return data, nil
}
func sliceContains(strs []string, str string) bool {
for _, s := range strs {
if s == str {
return true
}
}
return false
}