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Add support for instance age check in GCP.

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Fixes smallstep/step#164
This commit is contained in:
Mariano Cano 2019-06-04 15:57:15 -07:00
parent 4cef086c00
commit c431538ff2
5 changed files with 60 additions and 9 deletions
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8
authority/provisioner/duration.go
View file

@ -43,3 +43,11 @@ func (d *Duration) UnmarshalJSON(data []byte) (err error) {
d.Duration = _d
return
}
// Value returns 0 if the duration is null, the inner duration otherwise.
func (d *Duration) Value() time.Duration {
if d == nil {
return 0
}
return d.Duration
}

21
authority/provisioner/duration_test.go
View file

@ -59,3 +59,24 @@ func TestDuration_MarshalJSON(t *testing.T) {
})
}
}
func TestDuration_Value(t *testing.T) {
var dur *Duration
tests := []struct {
name string
duration *Duration
want time.Duration
}{
{"ok", &Duration{Duration: 1 * time.Minute}, 1 * time.Minute},
{"ok new", new(Duration), 0},
{"ok nil", nil, 0},
{"ok nil var", dur, 0},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
if got := tt.duration.Value(); got != tt.want {
t.Errorf("Duration.Value() = %v, want %v", got, tt.want)
}
})
}
}

13
authority/provisioner/gcp.go
View file

@ -73,6 +73,7 @@ type GCP struct {
ProjectIDs []string `json:"projectIDs"`
DisableCustomSANs bool `json:"disableCustomSANs"`
DisableTrustOnFirstUse bool `json:"disableTrustOnFirstUse"`
InstanceAge Duration `json:"instanceAge,omitempty"`
Claims *Claims `json:"claims,omitempty"`
claimer *Claimer
config *gcpConfig
@ -177,6 +178,8 @@ func (p *GCP) Init(config Config) error {
return errors.New("provisioner type cannot be empty")
case p.Name == "":
return errors.New("provisioner name cannot be empty")
case p.InstanceAge.Value() < 0:
return errors.New("provisioner instanceAge cannot be negative")
}
// Initialize config
p.assertConfig()
@ -271,9 +274,10 @@ func (p *GCP) authorizeToken(token string) (*gcpPayload, error) {
// According to "rfc7519 JSON Web Token" acceptable skew should be no
// more than a few minutes.
now := time.Now().UTC()
if err = claims.ValidateWithLeeway(jose.Expected{
Issuer: "https://accounts.google.com",
Time: time.Now().UTC(),
Time: now,
}, time.Minute); err != nil {
return nil, errors.Wrapf(err, "invalid token")
}
@ -311,6 +315,13 @@ func (p *GCP) authorizeToken(token string) (*gcpPayload, error) {
}
}
// validate instance age
if d := p.InstanceAge.Value(); d > 0 {
if now.Sub(claims.Google.ComputeEngine.InstanceCreationTimestamp.Time()) > d {
return nil, errors.New("token google.compute_engine.instance_creation_timestamp is too old")
}
}
switch {
case claims.Google.ComputeEngine.InstanceID == "":
return nil, errors.New("token google.compute_engine.instance_id cannot be empty")

25
authority/provisioner/gcp_test.go
View file

@ -159,11 +159,12 @@ func TestGCP_Init(t *testing.T) {
badClaims := &Claims{
DefaultTLSDur: &Duration{0},
}
zero := Duration{Duration: 0}
type fields struct {
Type string
Name string
ServiceAccounts []string
InstanceAge Duration
Claims *Claims
}
type args struct {
@ -176,12 +177,14 @@ func TestGCP_Init(t *testing.T) {
args args
wantErr bool
}{
{"ok", fields{"GCP", "name", nil, nil}, args{config, srv.URL}, false},
{"ok", fields{"GCP", "name", []string{"service-account"}, nil}, args{config, srv.URL}, false},
{"bad type", fields{"", "name", nil, nil}, args{config, srv.URL}, true},
{"bad name", fields{"GCP", "", nil, nil}, args{config, srv.URL}, true},
{"bad claims", fields{"GCP", "name", nil, badClaims}, args{config, srv.URL}, true},
{"bad certs", fields{"GCP", "name", nil, nil}, args{config, srv.URL + "/error"}, true},
{"ok", fields{"GCP", "name", nil, zero, nil}, args{config, srv.URL}, false},
{"ok", fields{"GCP", "name", []string{"service-account"}, zero, nil}, args{config, srv.URL}, false},
{"ok", fields{"GCP", "name", []string{"service-account"}, Duration{Duration: 1 * time.Minute}, nil}, args{config, srv.URL}, false},
{"bad type", fields{"", "name", nil, zero, nil}, args{config, srv.URL}, true},
{"bad name", fields{"GCP", "", nil, zero, nil}, args{config, srv.URL}, true},
{"bad duration", fields{"GCP", "name", nil, Duration{Duration: -1 * time.Minute}, nil}, args{config, srv.URL}, true},
{"bad claims", fields{"GCP", "name", nil, zero, badClaims}, args{config, srv.URL}, true},
{"bad certs", fields{"GCP", "name", nil, zero, nil}, args{config, srv.URL + "/error"}, true},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
@ -189,6 +192,7 @@ func TestGCP_Init(t *testing.T) {
Type: tt.fields.Type,
Name: tt.fields.Name,
ServiceAccounts: tt.fields.ServiceAccounts,
InstanceAge: tt.fields.InstanceAge,
Claims: tt.fields.Claims,
config: &gcpConfig{
CertsURL: tt.args.certsURL,
@ -214,6 +218,7 @@ func TestGCP_AuthorizeSign(t *testing.T) {
assert.FatalError(t, err)
p3.ProjectIDs = []string{"other-project-id"}
p3.ServiceAccounts = []string{"foo@developer.gserviceaccount.com"}
p3.InstanceAge = Duration{1 * time.Minute}
aKey, err := generateJSONWebKey()
assert.FatalError(t, err)
@ -269,6 +274,11 @@ func TestGCP_AuthorizeSign(t *testing.T) {
"instance-id", "instance-name", "project-id", "zone",
time.Now(), &p3.keyStore.keySet.Keys[0])
assert.FatalError(t, err)
failInvalidInstanceAge, err := generateGCPToken(p3.ServiceAccounts[0],
"https://accounts.google.com", p3.GetID(),
"instance-id", "instance-name", "other-project-id", "zone",
time.Now().Add(-1*time.Minute), &p3.keyStore.keySet.Keys[0])
assert.FatalError(t, err)
failInstanceID, err := generateGCPToken(p1.ServiceAccounts[0],
"https://accounts.google.com", p1.GetID(),
"", "instance-name", "project-id", "zone",
@ -311,6 +321,7 @@ func TestGCP_AuthorizeSign(t *testing.T) {
{"fail nbf", p1, args{failNbf}, 0, true},
{"fail service account", p1, args{failServiceAccount}, 0, true},
{"fail invalid project id", p3, args{failInvalidProjectID}, 0, true},
{"fail invalid instance age", p3, args{failInvalidInstanceAge}, 0, true},
{"fail instance id", p1, args{failInstanceID}, 0, true},
{"fail instance name", p1, args{failInstanceName}, 0, true},
{"fail project id", p1, args{failProjectID}, 0, true},

2
authority/provisioner/utils_test.go
View file

@ -513,7 +513,7 @@ func generateGCPToken(sub, iss, aud, instanceID, instanceName, projectID, zone s
ComputeEngine: gcpComputeEnginePayload{
InstanceID: instanceID,
InstanceName: instanceName,
InstanceCreationTimestamp: jose.NewNumericDate(iat.Add(-24 * time.Hour)),
InstanceCreationTimestamp: jose.NewNumericDate(iat),
ProjectID: projectID,
ProjectNumber: 1234567890,
Zone: zone,