408 lines
13 KiB
Go
408 lines
13 KiB
Go
package transit
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import (
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"context"
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"encoding/base64"
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"fmt"
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"reflect"
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"github.com/hashicorp/errwrap"
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"github.com/hashicorp/vault/sdk/framework"
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"github.com/hashicorp/vault/sdk/helper/errutil"
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"github.com/hashicorp/vault/sdk/helper/keysutil"
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"github.com/hashicorp/vault/sdk/logical"
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"github.com/mitchellh/mapstructure"
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)
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// BatchRequestItem represents a request item for batch processing
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type BatchRequestItem struct {
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// Context for key derivation. This is required for derived keys.
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Context string `json:"context" structs:"context" mapstructure:"context"`
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// DecodedContext is the base64 decoded version of Context
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DecodedContext []byte
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// Plaintext for encryption
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Plaintext string `json:"plaintext" structs:"plaintext" mapstructure:"plaintext"`
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// Ciphertext for decryption
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Ciphertext string `json:"ciphertext" structs:"ciphertext" mapstructure:"ciphertext"`
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// Nonce to be used when v1 convergent encryption is used
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Nonce string `json:"nonce" structs:"nonce" mapstructure:"nonce"`
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// The key version to be used for encryption
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KeyVersion int `json:"key_version" structs:"key_version" mapstructure:"key_version"`
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// DecodedNonce is the base64 decoded version of Nonce
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DecodedNonce []byte
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}
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// EncryptBatchResponseItem represents a response item for batch processing
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type EncryptBatchResponseItem struct {
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// Ciphertext for the plaintext present in the corresponding batch
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// request item
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Ciphertext string `json:"ciphertext,omitempty" structs:"ciphertext" mapstructure:"ciphertext"`
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// KeyVersion defines the key version used to encrypt plaintext.
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KeyVersion int `json:"key_version,omitempty" structs:"key_version" mapstructure:"key_version"`
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// Error, if set represents a failure encountered while encrypting a
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// corresponding batch request item
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Error string `json:"error,omitempty" structs:"error" mapstructure:"error"`
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}
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func (b *backend) pathEncrypt() *framework.Path {
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return &framework.Path{
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Pattern: "encrypt/" + framework.GenericNameRegex("name"),
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Fields: map[string]*framework.FieldSchema{
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"name": {
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Type: framework.TypeString,
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Description: "Name of the policy",
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},
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"plaintext": {
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Type: framework.TypeString,
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Description: "Base64 encoded plaintext value to be encrypted",
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},
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"context": {
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Type: framework.TypeString,
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Description: "Base64 encoded context for key derivation. Required if key derivation is enabled",
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},
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"nonce": {
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Type: framework.TypeString,
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Description: `
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Base64 encoded nonce value. Must be provided if convergent encryption is
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enabled for this key and the key was generated with Vault 0.6.1. Not required
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for keys created in 0.6.2+. The value must be exactly 96 bits (12 bytes) long
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and the user must ensure that for any given context (and thus, any given
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encryption key) this nonce value is **never reused**.
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`,
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},
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"type": {
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Type: framework.TypeString,
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Default: "aes256-gcm96",
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Description: `
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This parameter is required when encryption key is expected to be created.
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When performing an upsert operation, the type of key to create. Currently,
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"aes128-gcm96" (symmetric) and "aes256-gcm96" (symmetric) are the only types supported. Defaults to "aes256-gcm96".`,
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},
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"convergent_encryption": {
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Type: framework.TypeBool,
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Description: `
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This parameter will only be used when a key is expected to be created. Whether
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to support convergent encryption. This is only supported when using a key with
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key derivation enabled and will require all requests to carry both a context
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and 96-bit (12-byte) nonce. The given nonce will be used in place of a randomly
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generated nonce. As a result, when the same context and nonce are supplied, the
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same ciphertext is generated. It is *very important* when using this mode that
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you ensure that all nonces are unique for a given context. Failing to do so
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will severely impact the ciphertext's security.`,
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},
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"key_version": {
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Type: framework.TypeInt,
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Description: `The version of the key to use for encryption.
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Must be 0 (for latest) or a value greater than or equal
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to the min_encryption_version configured on the key.`,
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},
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},
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Callbacks: map[logical.Operation]framework.OperationFunc{
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logical.CreateOperation: b.pathEncryptWrite,
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logical.UpdateOperation: b.pathEncryptWrite,
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},
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ExistenceCheck: b.pathEncryptExistenceCheck,
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HelpSynopsis: pathEncryptHelpSyn,
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HelpDescription: pathEncryptHelpDesc,
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}
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}
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// decodeBatchRequestItems is a fast path alternative to mapstructure.Decode to decode []BatchRequestItem.
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// It aims to behave as closely possible to the original mapstructure.Decode and will return the same errors.
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// https://github.com/hashicorp/vault/pull/8775/files#r437709722
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func decodeBatchRequestItems(src interface{}, dst *[]BatchRequestItem) error {
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if src == nil || dst == nil {
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return nil
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}
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items, ok := src.([]interface{})
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if !ok {
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return fmt.Errorf("source data must be an array or slice, got %T", src)
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}
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// Early return should happen before allocating the array if the batch is empty.
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// However to comply with mapstructure output it's needed to allocate an empty array.
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sitems := len(items)
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*dst = make([]BatchRequestItem, sitems)
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if sitems == 0 {
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return nil
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}
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// To comply with mapstructure output the same error type is needed.
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var errs mapstructure.Error
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for i, iitem := range items {
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item, ok := iitem.(map[string]interface{})
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if !ok {
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return fmt.Errorf("[%d] expected a map, got '%T'", i, iitem)
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}
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if v, has := item["context"]; has {
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if !reflect.ValueOf(v).IsValid() {
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} else if casted, ok := v.(string); ok {
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(*dst)[i].Context = casted
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} else {
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errs.Errors = append(errs.Errors, fmt.Sprintf("'[%d].context' expected type 'string', got unconvertible type '%T'", i, item["context"]))
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}
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}
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if v, has := item["ciphertext"]; has {
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if !reflect.ValueOf(v).IsValid() {
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} else if casted, ok := v.(string); ok {
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(*dst)[i].Ciphertext = casted
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} else {
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errs.Errors = append(errs.Errors, fmt.Sprintf("'[%d].ciphertext' expected type 'string', got unconvertible type '%T'", i, item["ciphertext"]))
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}
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}
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// don't allow "null" to be passed in for the plaintext value
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if v, has := item["plaintext"]; has {
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if casted, ok := v.(string); ok {
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(*dst)[i].Plaintext = casted
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} else {
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errs.Errors = append(errs.Errors, fmt.Sprintf("'[%d].plaintext' expected type 'string', got unconvertible type '%T'", i, item["plaintext"]))
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}
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}
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if v, has := item["nonce"]; has {
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if !reflect.ValueOf(v).IsValid() {
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} else if casted, ok := v.(string); ok {
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(*dst)[i].Nonce = casted
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} else {
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errs.Errors = append(errs.Errors, fmt.Sprintf("'[%d].nonce' expected type 'string', got unconvertible type '%T'", i, item["nonce"]))
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}
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}
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if v, has := item["key_version"]; has {
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if !reflect.ValueOf(v).IsValid() {
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} else if casted, ok := v.(int); ok {
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(*dst)[i].KeyVersion = casted
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} else {
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errs.Errors = append(errs.Errors, fmt.Sprintf("'[%d].key_version' expected type 'int', got unconvertible type '%T'", i, item["key_version"]))
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}
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}
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}
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if len(errs.Errors) > 0 {
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return &errs
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}
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return nil
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}
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func (b *backend) pathEncryptExistenceCheck(ctx context.Context, req *logical.Request, d *framework.FieldData) (bool, error) {
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name := d.Get("name").(string)
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p, _, err := b.lm.GetPolicy(ctx, keysutil.PolicyRequest{
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Storage: req.Storage,
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Name: name,
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}, b.GetRandomReader())
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if err != nil {
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return false, err
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}
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if p != nil && b.System().CachingDisabled() {
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p.Unlock()
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}
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return p != nil, nil
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}
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func (b *backend) pathEncryptWrite(ctx context.Context, req *logical.Request, d *framework.FieldData) (*logical.Response, error) {
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name := d.Get("name").(string)
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var err error
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batchInputRaw := d.Raw["batch_input"]
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var batchInputItems []BatchRequestItem
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if batchInputRaw != nil {
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err = decodeBatchRequestItems(batchInputRaw, &batchInputItems)
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if err != nil {
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return nil, errwrap.Wrapf("failed to parse batch input: {{err}}", err)
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}
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if len(batchInputItems) == 0 {
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return logical.ErrorResponse("missing batch input to process"), logical.ErrInvalidRequest
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}
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} else {
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valueRaw, ok := d.GetOk("plaintext")
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if !ok {
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return logical.ErrorResponse("missing plaintext to encrypt"), logical.ErrInvalidRequest
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}
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batchInputItems = make([]BatchRequestItem, 1)
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batchInputItems[0] = BatchRequestItem{
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Plaintext: valueRaw.(string),
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Context: d.Get("context").(string),
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Nonce: d.Get("nonce").(string),
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KeyVersion: d.Get("key_version").(int),
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}
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}
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batchResponseItems := make([]EncryptBatchResponseItem, len(batchInputItems))
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contextSet := len(batchInputItems[0].Context) != 0
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// Before processing the batch request items, get the policy. If the
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// policy is supposed to be upserted, then determine if 'derived' is to
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// be set or not, based on the presence of 'context' field in all the
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// input items.
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for i, item := range batchInputItems {
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if (len(item.Context) == 0 && contextSet) || (len(item.Context) != 0 && !contextSet) {
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return logical.ErrorResponse("context should be set either in all the request blocks or in none"), logical.ErrInvalidRequest
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}
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_, err := base64.StdEncoding.DecodeString(item.Plaintext)
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if err != nil {
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batchResponseItems[i].Error = err.Error()
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continue
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}
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// Decode the context
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if len(item.Context) != 0 {
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batchInputItems[i].DecodedContext, err = base64.StdEncoding.DecodeString(item.Context)
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if err != nil {
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batchResponseItems[i].Error = err.Error()
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continue
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}
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}
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// Decode the nonce
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if len(item.Nonce) != 0 {
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batchInputItems[i].DecodedNonce, err = base64.StdEncoding.DecodeString(item.Nonce)
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if err != nil {
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batchResponseItems[i].Error = err.Error()
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continue
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}
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}
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}
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// Get the policy
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var p *keysutil.Policy
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var upserted bool
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var polReq keysutil.PolicyRequest
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if req.Operation == logical.CreateOperation {
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convergent := d.Get("convergent_encryption").(bool)
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if convergent && !contextSet {
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return logical.ErrorResponse("convergent encryption requires derivation to be enabled, so context is required"), nil
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}
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polReq = keysutil.PolicyRequest{
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Upsert: true,
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Storage: req.Storage,
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Name: name,
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Derived: contextSet,
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Convergent: convergent,
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}
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keyType := d.Get("type").(string)
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switch keyType {
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case "aes128-gcm96":
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polReq.KeyType = keysutil.KeyType_AES128_GCM96
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case "aes256-gcm96":
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polReq.KeyType = keysutil.KeyType_AES256_GCM96
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case "chacha20-poly1305":
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polReq.KeyType = keysutil.KeyType_ChaCha20_Poly1305
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case "ecdsa-p256", "ecdsa-p384", "ecdsa-p521":
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return logical.ErrorResponse(fmt.Sprintf("key type %v not supported for this operation", keyType)), logical.ErrInvalidRequest
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default:
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return logical.ErrorResponse(fmt.Sprintf("unknown key type %v", keyType)), logical.ErrInvalidRequest
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}
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} else {
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polReq = keysutil.PolicyRequest{
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Storage: req.Storage,
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Name: name,
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}
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}
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p, upserted, err = b.lm.GetPolicy(ctx, polReq, b.GetRandomReader())
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if err != nil {
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return nil, err
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}
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if p == nil {
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return logical.ErrorResponse("encryption key not found"), logical.ErrInvalidRequest
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}
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if !b.System().CachingDisabled() {
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p.Lock(false)
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}
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// Process batch request items. If encryption of any request
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// item fails, respectively mark the error in the response
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// collection and continue to process other items.
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for i, item := range batchInputItems {
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if batchResponseItems[i].Error != "" {
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continue
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}
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ciphertext, err := p.Encrypt(item.KeyVersion, item.DecodedContext, item.DecodedNonce, item.Plaintext)
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if err != nil {
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switch err.(type) {
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case errutil.UserError:
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batchResponseItems[i].Error = err.Error()
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continue
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default:
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p.Unlock()
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return nil, err
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}
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}
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if ciphertext == "" {
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p.Unlock()
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return nil, fmt.Errorf("empty ciphertext returned for input item %d", i)
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}
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keyVersion := item.KeyVersion
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if keyVersion == 0 {
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keyVersion = p.LatestVersion
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}
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batchResponseItems[i].Ciphertext = ciphertext
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batchResponseItems[i].KeyVersion = keyVersion
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}
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resp := &logical.Response{}
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if batchInputRaw != nil {
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resp.Data = map[string]interface{}{
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"batch_results": batchResponseItems,
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}
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} else {
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if batchResponseItems[0].Error != "" {
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p.Unlock()
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return logical.ErrorResponse(batchResponseItems[0].Error), logical.ErrInvalidRequest
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}
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resp.Data = map[string]interface{}{
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"ciphertext": batchResponseItems[0].Ciphertext,
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"key_version": batchResponseItems[0].KeyVersion,
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}
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}
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if req.Operation == logical.CreateOperation && !upserted {
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resp.AddWarning("Attempted creation of the key during the encrypt operation, but it was created beforehand")
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}
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p.Unlock()
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return resp, nil
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}
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const pathEncryptHelpSyn = `Encrypt a plaintext value or a batch of plaintext
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blocks using a named key`
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const pathEncryptHelpDesc = `
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This path uses the named key from the request path to encrypt a user provided
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plaintext or a batch of plaintext blocks. The plaintext must be base64 encoded.
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`
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