109 lines
3.0 KiB
Go
109 lines
3.0 KiB
Go
package seal
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import (
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"context"
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"time"
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metrics "github.com/armon/go-metrics"
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wrapping "github.com/hashicorp/go-kms-wrapping/v2"
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)
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type StoredKeysSupport int
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const (
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// The 0 value of StoredKeysSupport is an invalid option
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StoredKeysInvalid StoredKeysSupport = iota
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StoredKeysNotSupported
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StoredKeysSupportedGeneric
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StoredKeysSupportedShamirRoot
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)
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func (s StoredKeysSupport) String() string {
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switch s {
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case StoredKeysNotSupported:
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return "Old-style Shamir"
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case StoredKeysSupportedGeneric:
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return "AutoUnseal"
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case StoredKeysSupportedShamirRoot:
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return "New-style Shamir"
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default:
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return "Invalid StoredKeys type"
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}
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}
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// Access is the embedded implementation of autoSeal that contains logic
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// specific to encrypting and decrypting data, or in this case keys.
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type Access struct {
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wrapping.Wrapper
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WrapperType wrapping.WrapperType
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}
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func (a *Access) Init(ctx context.Context) error {
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if initWrapper, ok := a.Wrapper.(wrapping.InitFinalizer); ok {
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return initWrapper.Init(ctx)
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}
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return nil
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}
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func (a *Access) SetType(t wrapping.WrapperType) {
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a.WrapperType = t
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}
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func (a *Access) Type(ctx context.Context) (wrapping.WrapperType, error) {
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if a != nil && a.WrapperType != "" {
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return a.WrapperType, nil
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}
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return a.Wrapper.Type(ctx)
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}
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// Encrypt uses the underlying seal to encrypt the plaintext and returns it.
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func (a *Access) Encrypt(ctx context.Context, plaintext, aad []byte) (blob *wrapping.BlobInfo, err error) {
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wTyp, err := a.Wrapper.Type(ctx)
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if err != nil {
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return nil, err
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}
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defer func(now time.Time) {
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metrics.MeasureSince([]string{"seal", "encrypt", "time"}, now)
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metrics.MeasureSince([]string{"seal", wTyp.String(), "encrypt", "time"}, now)
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if err != nil {
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metrics.IncrCounter([]string{"seal", "encrypt", "error"}, 1)
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metrics.IncrCounter([]string{"seal", wTyp.String(), "encrypt", "error"}, 1)
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}
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}(time.Now())
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metrics.IncrCounter([]string{"seal", "encrypt"}, 1)
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metrics.IncrCounter([]string{"seal", wTyp.String(), "encrypt"}, 1)
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return a.Wrapper.Encrypt(ctx, plaintext, wrapping.WithAad(aad))
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}
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// Decrypt uses the underlying seal to decrypt the cryptotext and returns it.
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// Note that it is possible depending on the wrapper used that both pt and err
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// are populated.
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func (a *Access) Decrypt(ctx context.Context, data *wrapping.BlobInfo, aad []byte) (pt []byte, err error) {
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wTyp, err := a.Wrapper.Type(ctx)
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defer func(now time.Time) {
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metrics.MeasureSince([]string{"seal", "decrypt", "time"}, now)
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metrics.MeasureSince([]string{"seal", wTyp.String(), "decrypt", "time"}, now)
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if err != nil {
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metrics.IncrCounter([]string{"seal", "decrypt", "error"}, 1)
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metrics.IncrCounter([]string{"seal", wTyp.String(), "decrypt", "error"}, 1)
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}
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}(time.Now())
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metrics.IncrCounter([]string{"seal", "decrypt"}, 1)
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metrics.IncrCounter([]string{"seal", wTyp.String(), "decrypt"}, 1)
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return a.Wrapper.Decrypt(ctx, data, wrapping.WithAad(aad))
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}
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func (a *Access) Finalize(ctx context.Context) error {
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if finalizeWrapper, ok := a.Wrapper.(wrapping.InitFinalizer); ok {
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return finalizeWrapper.Finalize(ctx)
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}
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return nil
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}
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