107 lines
2.8 KiB
Go
107 lines
2.8 KiB
Go
package plugin
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import (
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"crypto/ecdsa"
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"crypto/rsa"
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"encoding/gob"
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"fmt"
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"sync"
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"github.com/hashicorp/go-plugin"
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"github.com/hashicorp/vault/helper/pluginutil"
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"github.com/hashicorp/vault/logical"
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)
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// Register these types since we have to serialize and de-serialize tls.ConnectionState
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// over the wire as part of logical.Request.Connection.
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func init() {
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gob.Register(rsa.PublicKey{})
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gob.Register(ecdsa.PublicKey{})
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}
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// BackendPluginClient is a wrapper around backendPluginClient
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// that also contains its plugin.Client instance. It's primarily
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// used to cleanly kill the client on Cleanup()
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type BackendPluginClient struct {
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client *plugin.Client
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sync.Mutex
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*backendPluginClient
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}
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// Cleanup calls the RPC client's Cleanup() func and also calls
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// the go-plugin's client Kill() func
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func (b *BackendPluginClient) Cleanup() {
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b.backendPluginClient.Cleanup()
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b.client.Kill()
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}
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// NewBackend will return an instance of an RPC-based client implementation of the backend for
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// external plugins, or a concrete implementation of the backend if it is a builtin backend.
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// The backend is returned as a logical.Backend interface.
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func NewBackend(pluginName string, sys pluginutil.LookRunnerUtil) (logical.Backend, error) {
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// Look for plugin in the plugin catalog
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pluginRunner, err := sys.LookupPlugin(pluginName)
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if err != nil {
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return nil, err
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}
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var backend logical.Backend
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if pluginRunner.Builtin {
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// Plugin is builtin so we can retrieve an instance of the interface
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// from the pluginRunner. Then cast it to logical.Backend.
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backendRaw, err := pluginRunner.BuiltinFactory()
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if err != nil {
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return nil, fmt.Errorf("error getting plugin type: %s", err)
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}
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var ok bool
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backend, ok = backendRaw.(logical.Backend)
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if !ok {
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return nil, fmt.Errorf("unsuported backend type: %s", pluginName)
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}
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} else {
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// create a backendPluginClient instance
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backend, err = newPluginClient(sys, pluginRunner)
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if err != nil {
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return nil, err
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}
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}
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return backend, nil
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}
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func newPluginClient(sys pluginutil.RunnerUtil, pluginRunner *pluginutil.PluginRunner) (logical.Backend, error) {
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// pluginMap is the map of plugins we can dispense.
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pluginMap := map[string]plugin.Plugin{
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"backend": &BackendPlugin{},
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}
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client, err := pluginRunner.Run(sys, pluginMap, handshakeConfig, []string{})
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if err != nil {
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return nil, err
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}
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// Connect via RPC
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rpcClient, err := client.Client()
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if err != nil {
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return nil, err
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}
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// Request the plugin
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raw, err := rpcClient.Dispense("backend")
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if err != nil {
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return nil, err
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}
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// We should have a logical backend type now. This feels like a normal interface
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// implementation but is in fact over an RPC connection.
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backendRPC := raw.(*backendPluginClient)
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return &BackendPluginClient{
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client: client,
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backendPluginClient: backendRPC,
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}, nil
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}
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