2021-04-20 21:31:37 +00:00
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// Package bootstrap deals with the creation of bootstrap files
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package bootstrap
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import (
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2022-10-11 19:24:53 +00:00
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"context"
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crypticnet "cryptic-net"
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"cryptic-net/garage"
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"cryptic-net/nebula"
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2021-04-20 21:31:37 +00:00
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"cryptic-net/tarutil"
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"fmt"
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"io"
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"io/fs"
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)
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// GetHashFromFS returns the hash of the contents of the given bootstrap file.
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// It may return nil if the bootstrap file doesn't have a hash.
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func GetHashFromFS(bootstrapFS fs.FS) ([]byte, error) {
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b, err := fs.ReadFile(bootstrapFS, tarutil.HashBinPath)
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if err != nil {
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return nil, fmt.Errorf("reading file %q from bootstrap fs: %w", tarutil.HashBinPath, err)
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}
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return b, nil
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}
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// GetHashFromReader reads the given tgz file as an fs.FS, and passes that to
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// GetHashFromFS.
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func GetHashFromReader(r io.Reader) ([]byte, error) {
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bootstrapFS, err := tarutil.FSFromReader(r)
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if err != nil {
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return nil, fmt.Errorf("reading tar fs from reader: %w", err)
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}
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return GetHashFromFS(bootstrapFS)
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}
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2022-10-11 19:24:53 +00:00
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func newBootstrap(
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ctx context.Context,
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into io.Writer,
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hostname provider,
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nebulaCerts provider,
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nebulaHosts provider,
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garageRPCSecret provider,
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garageGlobalBucketKey provider,
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garageHosts provider,
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) error {
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pairs := []struct {
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path string
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provider provider
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}{
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{"hostname", hostname},
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{"nebula/certs", nebulaCerts},
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{"nebula/hosts", nebulaHosts},
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{"garage/rpc-secret.txt", garageRPCSecret},
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{"garage/global-bucket-key.yml", garageGlobalBucketKey},
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{"garage/hosts", garageHosts},
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}
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w := tarutil.NewTGZWriter(into)
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for _, pair := range pairs {
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if err := pair.provider(ctx, w, pair.path); err != nil {
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return fmt.Errorf("populating %q in new bootstrap: %w", pair.path, err)
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}
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}
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return w.Close()
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}
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// NewForThisHost generates a new bootstrap file for the current host, based on
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// the existing environment as well as data in garage.
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func NewForThisHost(env *crypticnet.Env, into io.Writer) error {
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client, err := garage.GlobalBucketAPIClient(env)
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if err != nil {
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return fmt.Errorf("creating client for global bucket: %w", err)
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}
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return newBootstrap(
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env.Context,
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into,
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provideFromFS(env.BootstrapFS), // hostname
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provideDirFromFS(env.BootstrapFS), // nebulaCerts
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provideDirFromGarage(client), // nebulaHosts
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provideFromFS(env.BootstrapFS), // garageRPCSecret
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provideFromFS(env.BootstrapFS), // garageGlobalBucketKey
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provideDirFromGarage(client), // garageHosts
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)
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}
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// NewForHost generates a new bootstrap file for an arbitrary host, based on the
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// given admin file's FS and data in garage.
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func NewForHost(env *crypticnet.Env, adminFS fs.FS, name string, into io.Writer) error {
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host, ok := env.Hosts[name]
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if !ok {
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return fmt.Errorf("unknown host %q, make sure host entry has been created", name)
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}
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client, err := garage.GlobalBucketAPIClient(env)
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if err != nil {
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return fmt.Errorf("creating client for global bucket: %w", err)
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}
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nebulaHostCert, err := nebula.NewHostCert(adminFS, host.Nebula)
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if err != nil {
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return fmt.Errorf("creating new nebula host key/cert: %w", err)
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}
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nebulaHostCertDir := map[string][]byte{
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"ca.crt": nebulaHostCert.CACert,
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"host.key": nebulaHostCert.HostKey,
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"host.crt": nebulaHostCert.HostCert,
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}
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return newBootstrap(
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env.Context,
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into,
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provideFromBytes([]byte(name)), // hostname
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provideDirFromMap(nebulaHostCertDir), // nebulaCerts
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provideDirFromGarage(client), // nebulaHosts
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provideFromFS(adminFS), // garageRPCSecret
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provideFromFS(adminFS), // garageGlobalBucketKey
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provideDirFromGarage(client), // garageHosts
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)
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}
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