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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
53 lines
1.6 KiB
Go
53 lines
1.6 KiB
Go
package bootstrap
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/*
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* in order to be able to start up pomerium in case cloud is unreachable,
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* we store the minimum bootstrap configuration (essentially, the data broker connection)
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* in a file. this file is encrypted with a key that is derived from the cluster token.
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*
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* this information should be sufficient for pomerium to locate the database and start up.
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*
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*/
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import (
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"context"
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"crypto/cipher"
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"encoding/json"
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"fmt"
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"os"
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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/health"
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cluster_api "github.com/pomerium/pomerium/pkg/zero/cluster"
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)
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// LoadBootstrapConfigFromFile loads the bootstrap configuration from a file.
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func LoadBootstrapConfigFromFile(fp string, cipher cipher.AEAD) (*cluster_api.BootstrapConfig, error) {
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ciphertext, err := os.ReadFile(fp)
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if err != nil {
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return nil, fmt.Errorf("read bootstrap config: %w", err)
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}
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plaintext, err := cryptutil.Decrypt(cipher, ciphertext, nil)
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if err != nil {
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return nil, fmt.Errorf("decrypt bootstrap config: %w", err)
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}
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var dst cluster_api.BootstrapConfig
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err = json.Unmarshal(plaintext, &dst)
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if err != nil {
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return nil, fmt.Errorf("unmarshal bootstrap config: %w", err)
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}
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return &dst, nil
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}
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// SaveBootstrapConfig saves the bootstrap configuration to a file.
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func SaveBootstrapConfig(ctx context.Context, writer writers.ConfigWriter, src *cluster_api.BootstrapConfig) error {
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err := writer.WriteConfig(ctx, src)
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if err != nil {
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health.ReportError(health.ZeroBootstrapConfigSave, err)
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} else {
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health.ReportOK(health.ZeroBootstrapConfigSave)
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}
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return err
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}
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