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de603f87de
* Add new configurable bootstrap writers (#2405) This PR adds the ability to configure different backends to use for storing modifications to the zero bootstrap config. The two currently implemented backends allow writing changes to a file or to a Kubernetes secret. Backend selection is determined by the scheme in a URI passed to the flag '--config-writeback-uri'. In a Kubernetes environment, where the bootstrap config is mounted into the pod from a secret, this option allows Pomerium to write changes back to the secret, as writes to the mounted secret file on disk are not persisted. * Use env vars for bootstrap config filepath/writeback uri * linter pass and code cleanup * Add new config writer options mechanism This moves the encryption cipher parameter out of the WriteConfig() method in the ConfigWriter interface and into a new ConfigWriterOptions struct. Options (e.g. cipher) can be applied to an existing ConfigWriter to allow customizing implementation-specific behavior. * Code cleanup/lint fixes * Move vendored k8s code into separate package, and add license header and package comment
131 lines
3 KiB
Go
131 lines
3 KiB
Go
package bootstrap
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import (
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"crypto/cipher"
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"crypto/elliptic"
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"crypto/sha256"
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"encoding/base64"
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"fmt"
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"io"
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"time"
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"golang.org/x/crypto/hkdf"
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"github.com/pomerium/pomerium/config"
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"github.com/pomerium/pomerium/internal/atomicutil"
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"github.com/pomerium/pomerium/internal/deterministicecdsa"
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sdk "github.com/pomerium/pomerium/internal/zero/api"
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"github.com/pomerium/pomerium/internal/zero/bootstrap/writers"
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"github.com/pomerium/pomerium/pkg/cryptutil"
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"github.com/pomerium/pomerium/pkg/netutil"
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)
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// Source is a base config layer for Pomerium
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type Source struct {
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source
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api *sdk.API
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fileCachePath *string
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fileCipher cipher.AEAD
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writer writers.ConfigWriter
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checkForUpdate chan struct{}
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updateInterval atomicutil.Value[time.Duration]
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}
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// New creates a new bootstrap config source
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func New(secret []byte, fileCachePath *string, writer writers.ConfigWriter, api *sdk.API) (*Source, error) {
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cfg := new(config.Config)
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err := setConfigDefaults(cfg)
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if err != nil {
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return nil, fmt.Errorf("config defaults: %w", err)
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}
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rnd := hkdf.New(sha256.New, secret, nil, nil)
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err = initSecrets(cfg, rnd)
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if err != nil {
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return nil, fmt.Errorf("init secrets: %w", err)
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}
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cipher, err := initCipher(rnd)
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if err != nil {
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return nil, fmt.Errorf("init cypher: %w", err)
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}
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if writer != nil {
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writer = writer.WithOptions(writers.ConfigWriterOptions{
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Cipher: cipher,
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})
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}
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svc := &Source{
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api: api,
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source: source{ready: make(chan struct{})},
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fileCachePath: fileCachePath,
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fileCipher: cipher,
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checkForUpdate: make(chan struct{}, 1),
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writer: writer,
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}
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svc.cfg.Store(cfg)
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svc.updateInterval.Store(DefaultCheckForUpdateIntervalWhenDisconnected)
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return svc, nil
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}
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func setConfigDefaults(cfg *config.Config) error {
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cfg.Options = config.NewDefaultOptions()
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ports, err := netutil.AllocatePorts(6)
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if err != nil {
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return fmt.Errorf("allocating ports: %w", err)
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}
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cfg.AllocatePorts(*(*[6]string)(ports[:6]))
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return nil
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}
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func readKey(r io.Reader) ([]byte, error) {
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b := make([]byte, cryptutil.DefaultKeySize)
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_, err := io.ReadFull(r, b)
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if err != nil {
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return nil, fmt.Errorf("read from hkdf: %w", err)
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}
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return b, nil
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}
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func initCipher(r io.Reader) (cipher.AEAD, error) {
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cipherKey, err := readKey(r)
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if err != nil {
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return nil, fmt.Errorf("read key: %w", err)
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}
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cipher, err := cryptutil.NewAEADCipher(cipherKey)
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if err != nil {
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return nil, fmt.Errorf("new aead cipher: %w", err)
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}
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return cipher, nil
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}
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func initSecrets(cfg *config.Config, r io.Reader) error {
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signingKey, err := deterministicecdsa.GenerateKey(elliptic.P256(), r)
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if err != nil {
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return fmt.Errorf("read key: %w", err)
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}
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signingKeyEncoded, err := cryptutil.EncodePrivateKey(signingKey)
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if err != nil {
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return fmt.Errorf("pem: %w", err)
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}
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cookieSecret, err := readKey(r)
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if err != nil {
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return fmt.Errorf("read key: %w", err)
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}
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cfg.Options.CookieSecret = base64.StdEncoding.EncodeToString(cookieSecret)
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cfg.Options.SigningKey = base64.StdEncoding.EncodeToString(signingKeyEncoded)
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return nil
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}
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