/
kmspluginclient.go
94 lines (80 loc) · 2.91 KB
/
kmspluginclient.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
// Copyright 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package pluginclient contains logic for interacting with K8S KMS Plugin.
package kmspluginclient
import (
"fmt"
"net"
"net/url"
"strings"
"time"
plugin "github.com/GoogleCloudPlatform/k8s-cloudkms-plugin/plugin/v1"
"google.golang.org/grpc"
)
// Client interacts with KMS Plugin via gRPC.
type Client struct {
plugin.KeyManagementServiceClient
connection *grpc.ClientConn
}
// Close closes the underlying gRPC connection to KMS Plugin.
func (k *Client) Close() {
k.connection.Close()
}
// New constructs Client.
func New(endpoint string) (*Client, error) {
addr, err := parseEndpoint(endpoint)
if err != nil {
return nil, err
}
connection, err := grpc.Dial(addr, grpc.WithInsecure(), grpc.WithDefaultCallOptions(grpc.FailFast(false)), grpc.WithDialer(
func(string, time.Duration) (net.Conn, error) {
// Ignoring addr and timeout arguments:
// addr - comes from the closure
// timeout - is ignored since we are connecting in a non-blocking configuration
c, err := net.DialTimeout("unix", addr, 0)
if err != nil {
return nil, fmt.Errorf("failed to create connection to unix socket: %s, error: %v", addr, err)
}
return c, nil
}))
if err != nil {
return nil, fmt.Errorf("failed to create connection to %s, error: %v", addr, err)
}
kmsClient := plugin.NewKeyManagementServiceClient(connection)
return &Client{
KeyManagementServiceClient: kmsClient,
connection: connection,
}, nil
}
// Parse the endpoint to extract schema, host or path.
func parseEndpoint(endpoint string) (string, error) {
if len(endpoint) == 0 {
return "", fmt.Errorf("remote KMS provider can't use empty string as endpoint")
}
u, err := url.Parse(endpoint)
if err != nil {
return "", fmt.Errorf("invalid endpoint %q for remote KMS provider, error: %v", endpoint, err)
}
if u.Scheme != "unix" {
return "", fmt.Errorf("unsupported scheme %q for remote KMS provider", u.Scheme)
}
// Linux abstract namespace socket - no physical file required
// Warning: Linux Abstract sockets have not concept of ACL (unlike traditional file based sockets).
// However, Linux Abstract sockets are subject to Linux networking namespace, so will only be accessible to
// containers within the same pod (unless host networking is used).
if strings.HasPrefix(u.Path, "/@") {
return strings.TrimPrefix(u.Path, "/"), nil
}
return u.Path, nil
}