-
Notifications
You must be signed in to change notification settings - Fork 0
/
gce.go
184 lines (173 loc) · 5.13 KB
/
gce.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
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
package gce
import (
"fmt"
log "github.com/sirupsen/logrus"
"strconv"
"github.com/pkg/errors"
"github.com/oboukili/vault-discovery/helpers"
"github.com/oboukili/vault-discovery/types"
"golang.org/x/net/context"
"google.golang.org/api/compute/v1"
"google.golang.org/api/option"
"net"
"os"
"os/exec"
"strings"
"time"
)
func filterInstances(instances []*compute.Instance) (result []*compute.Instance) {
filter, ok := os.LookupEnv("TAG_INSTANCE_FILTER")
switch ok {
case true:
for _, i := range instances {
for _, t := range i.Tags.Items {
// Strict equality on tags
if strings.EqualFold(t, filter) {
result = append(result, i)
}
}
}
case false:
result = instances
}
filter, ok = os.LookupEnv("LABEL_INSTANCE_FILTER")
if ok {
for _, i := range result {
for _, l := range i.Labels {
// Strict equality on labels
if strings.EqualFold(l, filter) {
result = append(result, i)
}
}
}
}
filter, ok = os.LookupEnv("NAME_INSTANCE_FILTER")
if ok {
for _, i := range result {
if strings.Contains(i.Name, filter) {
result = append(result, i)
}
}
}
return result
}
func initServiceClient(ctx context.Context) (s *compute.Service, err error) {
s, err = compute.NewService(ctx, option.WithScopes(compute.ComputeReadonlyScope))
if err != nil {
return nil, err
}
return s, err
}
func GetInstances(ctx context.Context, project string, s *compute.InstancesService) (r zonalInstances, err error) {
r = make(zonalInstances)
req := s.AggregatedList(project).Context(ctx)
if err := req.Pages(ctx, func(page *compute.InstanceAggregatedList) error {
for zone, instancesScopedList := range page.Items {
if len(instancesScopedList.Instances) > 0 {
r[strings.TrimPrefix(zone, "zones/")] = filterInstances(instancesScopedList.Instances)
}
}
return nil
}); err != nil {
return nil, err
}
var instancesCount int
for _, v := range r {
if len(v) == 0 {
return nil, fmt.Errorf("(GCE) Could not get some instances' details, it usually happens if your filters (tags,name,labels) do not match: %+v", r)
}
instancesCount += len(v)
}
log.WithField("count", instancesCount).Info("(GCE) Found Vault instances ;)")
return r, err
}
func GetVaultPrimaryTunnelConn(ctx context.Context, project string, attrs types.VaultTunnelConnAttrs) (v types.VaultTunnelConn, err error) {
c, err := initServiceClient(ctx)
if err != nil {
log.WithError(err).Fatalf("(GCE) Could not initialize Service client!")
}
instanceService := compute.NewInstancesService(c)
r, err := GetInstances(ctx, project, instanceService)
if err != nil {
log.WithError(err).Fatalf("(GCE) Could not get instances!")
}
if len(r) == 0 {
log.Fatalf("(GCE) No instances were found!")
}
ch := make(chan types.VaultTunnelConn, 1)
for _, instances := range r {
for _, i := range instances {
go func() {
if err := handleInitTunnelConn(ch, i, attrs, project); err != nil {
log.WithError(err).Fatal()
}
}()
}
}
v = <-ch
return v, err
}
func handleInitTunnelConn(c chan types.VaultTunnelConn, instance *compute.Instance, attrs types.VaultTunnelConnAttrs, project string) error {
gCloudPort, err := helpers.GetAvailableLocalTCPPort()
if err != nil {
return errors.Wrapf(err, "(GCE) Could not get a free TCP port!")
}
if _, err := exec.LookPath("gcloud"); err != nil {
return errors.Wrapf(err, "(GCE) Could not find gcloud in PATH!")
}
log.WithField("port", gCloudPort).Info("(GCE) Starting IAP tunnel...")
tunnel := exec.Command("gcloud", "compute",
"start-iap-tunnel", instance.Name, attrs.LocalPort,
"--project", project,
"--local-host-port", "127.0.0.1:"+gCloudPort,
"--zone", instance.Zone)
var debug bool
d, ok := os.LookupEnv("GCE_DEBUG")
if ok {
debug, err = strconv.ParseBool(d)
if err != nil {
return errors.Wrapf(err, "GCE_DEBUG Environment variable should be boolean compatible")
}
}
if debug {
tunnel.Stderr = os.Stderr
tunnel.Stdout = os.Stdout
}
err = tunnel.Start()
if err != nil {
return errors.Wrapf(err, "(GCE) Could not start the tunnel!")
}
// Wait for IAP tunnel socket to be open before continuing
var conn net.Conn
startingTimestampInSeconds := time.Now().Second()
for {
conn, err = net.DialTimeout("tcp4", "127.0.0.1:"+gCloudPort, 60*time.Second)
if conn != nil && err == nil {
break
}
time.Sleep(1 * time.Second)
if time.Now().Second() > startingTimestampInSeconds+10 {
return errors.Wrapf(err, "(GCE) Could not connect to the TCP tunnel within 10 seconds!")
}
}
log.WithField("port", gCloudPort).Info("(GCE) IAP tunnel open ;)")
var url strings.Builder
url.WriteString(attrs.VaultScheme)
url.WriteString("://")
url.WriteString(attrs.LocalAddr)
url.WriteString(":")
url.WriteString(gCloudPort)
ok, err = helpers.IsVaultPrimaryInstance(url.String())
if err != nil {
return errors.Wrapf(err, "(GCE) Could not call Vault instance! url: %s", url.String())
}
switch ok {
case false:
helpers.HandlerCloseConn(conn, nil)
helpers.HandlerExitCommand(tunnel)
case true:
log.WithField("PrimaryInstanceName", instance.Name).Infof("(GCE) Primary Vault instance detected ;)")
c <- types.VaultTunnelConn{Conn: conn, Cmd: tunnel, Attrs: attrs}
}
return err
}