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// Copyright 2022 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
//
// http://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 client (in testing) allows tests to get a fake or real sev-guest device.
package client
import (
"testing"
"github.com/google/go-sev-guest/abi"
"github.com/google/go-sev-guest/client"
test "github.com/google/go-sev-guest/testing"
"github.com/google/go-sev-guest/verify/trust"
"google.golang.org/protobuf/proto"
)
// SkipUnmockableTestCase returns whether we have to skip a mocked failure test case on real hardware.
func SkipUnmockableTestCase(tc *test.TestCase) bool {
return !client.UseDefaultSevGuest() && tc.FwErr != 0
}
// GetSevGuest is a cross-platform testing helper function that retrieves the
// appropriate SEV-guest device from the flags passed into "go test".
//
// If using a test guest device, this will also produce a fake AMD-SP that produces the signed
// versions of given attestation reports based on different nonce input. Its returned roots of trust
// are based on the fake's signing credentials.
func GetSevGuest(tcs []test.TestCase, opts *test.DeviceOptions, tb testing.TB) (client.Device, map[string][]*trust.AMDRootCerts, map[string][]*trust.AMDRootCerts, trust.HTTPSGetter) {
tb.Helper()
if client.UseDefaultSevGuest() {
sevTestDevice, err := test.TcDevice(tcs, opts)
if err != nil {
tb.Fatalf("failed to create test device: %v", err)
}
goodSnpRoot := map[string][]*trust.AMDRootCerts{
"Milan": {
{
Product: "Milan", // TODO(Issue#114): Remove
ProductLine: "Milan",
ProductCerts: &trust.ProductCerts{
Ask: sevTestDevice.Signer.Ask,
Ark: sevTestDevice.Signer.Ark,
Asvk: sevTestDevice.Signer.Asvk,
},
},
},
}
badSnpRoot := map[string][]*trust.AMDRootCerts{
"Milan": {
{
Product: "Milan", // TODO(Issue#114): Remove
ProductLine: "Milan",
ProductCerts: &trust.ProductCerts{
// No ASK, oops.
Ask: sevTestDevice.Signer.Ark,
Ark: sevTestDevice.Signer.Ark,
Asvk: sevTestDevice.Signer.Ark,
},
},
},
}
fakekds, err := test.FakeKDSFromSigner(sevTestDevice.Signer)
if err != nil {
tb.Fatalf("failed to create fake KDS from signer: %v", err)
}
return sevTestDevice, goodSnpRoot, badSnpRoot, fakekds
}
client, err := client.OpenDevice()
if err != nil {
tb.Fatalf("Failed to open SEV guest device: %v", err)
}
kdsImpl := test.GetKDS(tb)
badSnpRoot := make(map[string][]*trust.AMDRootCerts)
for productLine, rootCerts := range trust.DefaultRootCerts {
// Supplement the defaults with the missing x509 certificates.
pc, err := trust.GetProductChain(productLine, abi.VcekReportSigner, kdsImpl)
if err != nil {
tb.Fatalf("failed to get product chain for %q: %v", productLine, err)
}
// By removing the ASK intermediate, we ensure that the attestation will never verify.
badSnpRoot[productLine] = []*trust.AMDRootCerts{{
Product: productLine, // TODO(Issue#114): Remove
ProductLine: productLine,
ProductCerts: &trust.ProductCerts{
Ark: pc.Ark,
Ask: pc.Ark,
Asvk: pc.Ark,
},
AskSev: rootCerts.ArkSev,
ArkSev: rootCerts.AskSev,
}}
}
return client, nil, badSnpRoot, kdsImpl
}
// GetSevQuoteProvider is a cross-platform testing helper function that retrieves the
// appropriate SEV-guest device from the flags passed into "go test".
//
// If using a test guest device, this will also produce a fake AMD-SP that produces the signed
// versions of given attestation reports based on different nonce input. Its returned roots of trust
// are based on the fake's signing credentials.
func GetSevQuoteProvider(tcs []test.TestCase, opts *test.DeviceOptions, tb testing.TB) (client.QuoteProvider, map[string][]*trust.AMDRootCerts, map[string][]*trust.AMDRootCerts, trust.HTTPSGetter) {
tb.Helper()
if client.UseDefaultSevGuest() {
sevQp, err := test.TcQuoteProvider(tcs, opts)
if err != nil {
tb.Fatalf("failed to create test device: %v", err)
}
goodSnpRoot := map[string][]*trust.AMDRootCerts{
"Milan": {
{
Product: "Milan", // TODO(Issue#114): Remove
ProductLine: "Milan",
ProductCerts: &trust.ProductCerts{
Ask: sevQp.Device.Signer.Ask,
Ark: sevQp.Device.Signer.Ark,
Asvk: sevQp.Device.Signer.Asvk,
},
},
},
"Genoa": {
{
Product: "Genoa", // TODO(Issue#114): Remove
ProductLine: "Genoa",
ProductCerts: &trust.ProductCerts{
Ask: sevQp.Device.Signer.Ask,
Ark: sevQp.Device.Signer.Ark,
Asvk: sevQp.Device.Signer.Asvk,
},
},
},
}
badSnpRoot := map[string][]*trust.AMDRootCerts{
"Milan": {
{
Product: "Milan", // TODO(Issue#114): Remove
ProductLine: "Milan",
ProductCerts: &trust.ProductCerts{
// No ASK, oops.
Ask: sevQp.Device.Signer.Ark,
Ark: sevQp.Device.Signer.Ark,
Asvk: sevQp.Device.Signer.Ark,
},
},
},
"Genoa": {
{
Product: "Genoa", // TODO(Issue#114): Remove
ProductLine: "Genoa",
ProductCerts: &trust.ProductCerts{
// No ASK, oops.
Ask: sevQp.Device.Signer.Ark,
Ark: sevQp.Device.Signer.Ark,
Asvk: sevQp.Device.Signer.Ark,
},
},
},
}
fakekds, err := test.FakeKDSFromSigner(sevQp.Device.Signer)
if err != nil {
tb.Fatalf("failed to create fake KDS from signer: %v", err)
}
return sevQp, goodSnpRoot, badSnpRoot, fakekds
}
// If requested to use a different product than on the machine, fail.
if opts.Product != nil && !proto.Equal(abi.SevProduct(), opts.Product) {
return nil, nil, nil, nil
}
client, err := client.GetQuoteProvider()
if err != nil {
tb.Fatalf("Failed to open SEV guest device: %v", err)
}
kdsImpl := test.GetKDS(tb)
badSnpRoot := make(map[string][]*trust.AMDRootCerts)
for productLine, rootCerts := range trust.DefaultRootCerts {
// Supplement the defaults with the missing x509 certificates.
pc, err := trust.GetProductChain(productLine, abi.VcekReportSigner, kdsImpl)
if err != nil {
tb.Fatalf("failed to get product chain for %q: %v", productLine, err)
}
// By removing the ASK intermediate, we ensure that the attestation will never verify.
badSnpRoot[productLine] = []*trust.AMDRootCerts{{
Product: productLine, // TODO(Issue#114): Remove
ProductLine: productLine,
ProductCerts: &trust.ProductCerts{
Ark: pc.Ark,
Ask: pc.Ark,
Asvk: pc.Ark,
},
AskSev: rootCerts.ArkSev,
ArkSev: rootCerts.AskSev,
}}
}
return client, nil, badSnpRoot, kdsImpl
}
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