Revert "[launcher] Merge upstream/tdx_rtmr (#513)"

.github/workflows/ci.yml

@@ -24,19 +24,13 @@ on:
       - main
   pull_request:
 
-
 jobs:
   build:
     strategy:
       matrix:
         go-version: [1.21.x]
         # TODO: Get this working on windows-latest
         os: [ubuntu-latest]
-        # ci will build and run tests based on the following matrix
-        #             mac-os                linux                           windows
-        # x32         [no builds]           . ./cmd ./verifier ./launcher   [no builds]
-        # x64         . ./cmd ./verifier    . ./cmd ./verifier ./launcher   [no builds]
-        # arm64       . ./cmd ./verifier    [no builds]                     [no builds]
         architecture: [x32, x64]
         include:
           - os: macos-latest
@@ -77,21 +71,17 @@ jobs:
       - name: Install Windows packages
         run: choco install openssl
         if: runner.os == 'Windows'
-      - name: Build all modules except launcher
-        run: go build -v ./... ./cmd/... ./verifier/...
-      - name: Build launcher module
-        run: go build -v ./launcher/...
-        if: runner.os == 'Linux'
+      - name: Build all modules
+        run: go build -v ./... ./cmd/... ./launcher/... ./verifier/...
       - name: Run specific tests under root permission
         run: |
           GO_EXECUTABLE_PATH=$(which go)
           sudo $GO_EXECUTABLE_PATH test -v -run "TestFetchImageSignaturesDockerPublic" ./launcher
-        if: runner.os == 'Linux'
       - name: Run all tests in launcher to capture potential data race
         run: go test -v -race ./launcher/...
-        if: (runner.os == 'Linux') && matrix.architecture == 'x64'
-      - name: Test all modules except launcher
-        run: go test -v ./... ./cmd/... ./verifier/... -skip='TestCacheConcurrentSetGet|TestHwAttestationPass|TestHardwareAttestationPass'
+        if: (runner.os == 'Linux' || runner.os == 'macOS') && matrix.architecture == 'x64'
+      - name: Test all modules
+        run: go test -v ./... ./cmd/... ./launcher/... ./verifier/... -skip='TestCacheConcurrentSetGet|TestHwAttestationPass|TestHardwareAttestationPass'
 
   lint:
     strategy:

client/attest.go

@@ -1,18 +1,24 @@
 package client
 
 import (
+	"crypto/x509"
 	"fmt"
+	"io"
 	"net/http"
 
 	sabi "github.com/google/go-sev-guest/abi"
 	sg "github.com/google/go-sev-guest/client"
 	tg "github.com/google/go-tdx-guest/client"
 	tabi "github.com/google/go-tdx-guest/client/linuxabi"
 	tpb "github.com/google/go-tdx-guest/proto/tdx"
-	"github.com/google/go-tpm-tools/internal"
 	pb "github.com/google/go-tpm-tools/proto/attest"
 )
 
+const (
+	maxIssuingCertificateURLs = 3
+	maxCertChainLength        = 4
+)
+
 // TEEDevice is an interface to add an attestation report from a TEE technology's
 // attestation driver or quote provider.
 type TEEDevice interface {
@@ -43,7 +49,6 @@ type AttestOpts struct {
 	// Currently, we only support PCR replay for PCRs orthogonal to those in the
 	// firmware event log, where PCRs 0-9 and 14 are often measured. If the two
 	// logs overlap, server-side verification using this library may fail.
-	// Deprecated: Manually populate the pb.Attestation instead.
 	CanonicalEventLog []byte
 	// If non-nil, will be used to fetch the AK certificate chain for validation.
 	// Key.Attest() will construct the certificate chain by making GET requests to
@@ -61,6 +66,77 @@ type AttestOpts struct {
 	TEENonce []byte
 }
 
+// Given a certificate, iterates through its IssuingCertificateURLs and returns
+// the certificate that signed it. If the certificate lacks an
+// IssuingCertificateURL, return nil. If fetching the certificates fails or the
+// cert chain is malformed, return an error.
+func fetchIssuingCertificate(client *http.Client, cert *x509.Certificate) (*x509.Certificate, error) {
+	// Check if we should event attempt fetching.
+	if cert == nil || len(cert.IssuingCertificateURL) == 0 {
+		return nil, nil
+	}
+	// For each URL, fetch and parse the certificate, then verify whether it signed cert.
+	// If successful, return the parsed certificate. If any step in this process fails, try the next url.
+	// If all the URLs fail, return the last error we got.
+	// TODO(Issue #169): Return a multi-error here
+	var lastErr error
+	for i, url := range cert.IssuingCertificateURL {
+		// Limit the number of attempts.
+		if i >= maxIssuingCertificateURLs {
+			break
+		}
+		resp, err := client.Get(url)
+		if err != nil {
+			lastErr = fmt.Errorf("failed to retrieve certificate at %v: %w", url, err)
+			continue
+		}
+
+		if resp.StatusCode != http.StatusOK {
+			lastErr = fmt.Errorf("certificate retrieval from %s returned non-OK status: %v", url, resp.StatusCode)
+			continue
+		}
+		certBytes, err := io.ReadAll(resp.Body)
+		resp.Body.Close()
+		if err != nil {
+			lastErr = fmt.Errorf("failed to read response body from %s: %w", url, err)
+			continue
+		}
+
+		parsedCert, err := x509.ParseCertificate(certBytes)
+		if err != nil {
+			lastErr = fmt.Errorf("failed to parse response from %s into a certificate: %w", url, err)
+			continue
+		}
+
+		// Check if the parsed certificate signed the current one.
+		if err = cert.CheckSignatureFrom(parsedCert); err != nil {
+			lastErr = fmt.Errorf("parent certificate from %s did not sign child: %w", url, err)
+			continue
+		}
+		return parsedCert, nil
+	}
+	return nil, lastErr
+}
+
+// Constructs the certificate chain for the key's certificate.
+// If an error is encountered in the process, return what has been constructed so far.
+func (k *Key) getCertificateChain(client *http.Client) ([][]byte, error) {
+	var certs [][]byte
+	currentCert := k.cert
+	for len(certs) <= maxCertChainLength {
+		issuingCert, err := fetchIssuingCertificate(client, currentCert)
+		if err != nil {
+			return nil, err
+		}
+		if issuingCert == nil {
+			return certs, nil
+		}
+		certs = append(certs, issuingCert.Raw)
+		currentCert = issuingCert
+	}
+	return nil, fmt.Errorf("max certificate chain length (%v) exceeded", maxCertChainLength)
+}
+
 // SevSnpQuoteProvider encapsulates the SEV-SNP attestation device to add its attestation report
 // to a pb.Attestation.
 type SevSnpQuoteProvider struct {
@@ -307,13 +383,12 @@ func (k *Key) Attest(opts AttestOpts) (*pb.Attestation, error) {
 	// Attempt to construct certificate chain. fetchIssuingCertificate checks if
 	// AK cert is present and contains intermediate cert URLs.
 	if opts.CertChainFetcher != nil {
-		attestation.IntermediateCerts, err = internal.GetCertificateChain(k.cert, opts.CertChainFetcher)
+		attestation.IntermediateCerts, err = k.getCertificateChain(opts.CertChainFetcher)
 		if err != nil {
 			return nil, fmt.Errorf("fetching certificate chain: %w", err)
 		}
 	}
 
-	// TODO: issues/504 this should be outside of this function, not related to TPM attestation
 	if err := getTEEAttestationReport(&attestation, opts); err != nil {
 		return nil, fmt.Errorf("collecting TEE attestation report: %w", err)
 	}

client/attest_network_test.go

@@ -5,7 +5,6 @@ import (
 	"net/http"
 	"testing"
 
-	"github.com/google/go-tpm-tools/internal"
 	"github.com/google/go-tpm-tools/internal/test"
 	pb "github.com/google/go-tpm-tools/proto/attest"
 	"google.golang.org/protobuf/proto"
@@ -25,7 +24,9 @@ func TestNetworkFetchIssuingCertificate(t *testing.T) {
 		t.Fatalf("Error parsing AK Cert: %v", err)
 	}
 
-	certChain, err := internal.GetCertificateChain(akCert, externalClient)
+	key := &Key{cert: akCert}
+
+	certChain, err := key.getCertificateChain(externalClient)
 	if err != nil {
 		t.Error(err)
 	}

client/attest_test.go

@@ -2,7 +2,10 @@ package client
 
 import (
 	"bytes"
+	"crypto/rand"
+	"crypto/rsa"
 	"crypto/x509"
+	"math/big"
 	"net/http"
 	"net/http/httptest"
 	"strings"
@@ -20,8 +23,112 @@ import (
 
 var localClient = http.DefaultClient
 
+// Returns an x509 Certificate with the provided issuingURL and signed with the provided parent certificate and key.
+// If parentCert and parentKey are nil, the certificate will be self-signed.
+func getTestCert(t *testing.T, issuingURL []string, parentCert *x509.Certificate, parentKey *rsa.PrivateKey) (*x509.Certificate, *rsa.PrivateKey) {
+	t.Helper()
+
+	certKey, _ := rsa.GenerateKey(rand.Reader, 2048)
+
+	template := &x509.Certificate{
+		SerialNumber:          big.NewInt(1),
+		NotBefore:             time.Now(),
+		NotAfter:              time.Now().AddDate(10, 0, 0),
+		KeyUsage:              x509.KeyUsageCertSign | x509.KeyUsageCRLSign,
+		ExtKeyUsage:           []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
+		BasicConstraintsValid: true,
+		IsCA:                  true,
+		MaxPathLenZero:        true,
+		IssuingCertificateURL: issuingURL,
+	}
+
+	if parentCert == nil && parentKey == nil {
+		parentCert = template
+		parentKey = certKey
+	}
+
+	certBytes, err := x509.CreateCertificate(rand.Reader, template, parentCert, certKey.Public(), parentKey)
+	if err != nil {
+		t.Fatalf("Unable to create test certificate: %v", err)
+	}
+
+	cert, err := x509.ParseCertificate(certBytes)
+	if err != nil {
+		t.Fatalf("Unable to parse test certificate: %v", err)
+	}
+
+	return cert, certKey
+}
+
+func TestFetchIssuingCertificateSucceeds(t *testing.T) {
+	testCA, caKey := getTestCert(t, nil, nil, nil)
+
+	ts := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, _ *http.Request) {
+		rw.WriteHeader(http.StatusOK)
+		rw.Write(testCA.Raw)
+	}))
+	defer ts.Close()
+
+	leafCert, _ := getTestCert(t, []string{"invalid.URL", ts.URL}, testCA, caKey)
+
+	cert, err := fetchIssuingCertificate(localClient, leafCert)
+	if err != nil || cert == nil {
+		t.Errorf("fetchIssuingCertificate() did not find valid intermediate cert: %v", err)
+	}
+}
+
+func TestFetchIssuingCertificateReturnsErrorIfMalformedCertificateFound(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, _ *http.Request) {
+		rw.WriteHeader(http.StatusOK)
+		rw.Write([]byte("these are some random bytes"))
+	}))
+	defer ts.Close()
+
+	testCA, caKey := getTestCert(t, nil, nil, nil)
+	leafCert, _ := getTestCert(t, []string{ts.URL}, testCA, caKey)
+
+	_, err := fetchIssuingCertificate(localClient, leafCert)
+	if err == nil {
+		t.Fatal("expected fetchIssuingCertificate to fail with malformed cert")
+	}
+}
+
+func TestGetCertificateChainSucceeds(t *testing.T) {
+	// Create CA and corresponding server.
+	testCA, caKey := getTestCert(t, nil, nil, nil)
+
+	caServer := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, _ *http.Request) {
+		rw.WriteHeader(http.StatusOK)
+		rw.Write(testCA.Raw)
+	}))
+
+	defer caServer.Close()
+
+	// Create intermediate cert and corresponding server.
+	intermediateCert, intermediateKey := getTestCert(t, []string{caServer.URL}, testCA, caKey)
+
+	intermediateServer := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, _ *http.Request) {
+		rw.WriteHeader(http.StatusOK)
+		rw.Write(intermediateCert.Raw)
+	}))
+	defer intermediateServer.Close()
+
+	// Create leaf cert.
+	leafCert, _ := getTestCert(t, []string{intermediateServer.URL}, intermediateCert, intermediateKey)
+
+	key := &Key{cert: leafCert}
+
+	certChain, err := key.getCertificateChain(localClient)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(certChain) != 2 {
+		t.Fatalf("getCertificateChain did not return the expected number of certificates: got %v, want 2", len(certChain))
+	}
+}
+
 func TestKeyAttestSucceedsWithCertChainRetrieval(t *testing.T) {
-	testCA, caKey := test.GetTestCert(t, nil, nil, nil)
+	testCA, caKey := getTestCert(t, nil, nil, nil)
 
 	caServer := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, _ *http.Request) {
 		rw.WriteHeader(http.StatusOK)
@@ -30,7 +137,7 @@ func TestKeyAttestSucceedsWithCertChainRetrieval(t *testing.T) {
 
 	defer caServer.Close()
 
-	leafCert, _ := test.GetTestCert(t, []string{caServer.URL}, testCA, caKey)
+	leafCert, _ := getTestCert(t, []string{caServer.URL}, testCA, caKey)
 
 	rwc := test.GetTPM(t)
 	defer CheckedClose(t, rwc)
@@ -66,7 +173,7 @@ func TestKeyAttestGetCertificateChainConditions(t *testing.T) {
 		t.Fatalf("Failed to generate test AK: %v", err)
 	}
 
-	akCert, _ := test.GetTestCert(t, nil, nil, nil)
+	akCert, _ := getTestCert(t, nil, nil, nil)
 
 	testcases := []struct {
 		name                 string

cmd/go.sum

@@ -348,6 +348,7 @@ github.com/google/go-replayers/httpreplay v0.1.0/go.mod h1:YKZViNhiGgqdBlUbI2MwG
 github.com/google/go-sev-guest v0.11.2-0.20241009005433-de2ac900e958 h1:GfnkFZNr80qFGLR/EY75zwk8puz8+frGj4iwPwnJbSU=
 github.com/google/go-sev-guest v0.11.2-0.20241009005433-de2ac900e958/go.mod h1:8+UOtSaqVIZjJJ9DDmgRko3J/kNc6jI5KLHxoeao7cA=
 github.com/google/go-tdx-guest v0.3.2-0.20241009005452-097ee70d0843 h1:+MoPobRN9HrDhGyn6HnF5NYo4uMBKaiFqAtf/D/OB4A=
+github.com/google/go-tdx-guest v0.3.2-0.20241009005452-097ee70d0843/go.mod h1:g/n8sKITIT9xRivBUbizo34DTsUm2nN2uU3A662h09g=
 github.com/google/go-tpm v0.9.0 h1:sQF6YqWMi+SCXpsmS3fd21oPy/vSddwZry4JnmltHVk=
 github.com/google/go-tpm v0.9.0/go.mod h1:FkNVkc6C+IsvDI9Jw1OveJmxGZUUaKxtrpOS47QWKfU=
 github.com/google/go-tspi v0.3.0 h1:ADtq8RKfP+jrTyIWIZDIYcKOMecRqNJFOew2IT0Inus=
@@ -585,6 +586,8 @@ github.com/otiai10/mint v1.3.1/go.mod h1:/yxELlJQ0ufhjUwhshSj+wFjZ78CnZ48/1wtmBH
 github.com/pact-foundation/pact-go v1.0.4/go.mod h1:uExwJY4kCzNPcHRj+hCR/HBbOOIwwtUjcrb0b5/5kLM=
 github.com/pascaldekloe/goe v0.0.0-20180627143212-57f6aae5913c/go.mod h1:lzWF7FIEvWOWxwDKqyGYQf6ZUaNfKdP144TG7ZOy1lc=
 github.com/pborman/uuid v1.2.0/go.mod h1:X/NO0urCmaxf9VXbdlT7C2Yzkj2IKimNn4k+gtPdI/k=
+github.com/pborman/uuid v1.2.1 h1:+ZZIw58t/ozdjRaXh/3awHfmWRbzYxJoAdNJxe/3pvw=
+github.com/pborman/uuid v1.2.1/go.mod h1:X/NO0urCmaxf9VXbdlT7C2Yzkj2IKimNn4k+gtPdI/k=
 github.com/pelletier/go-buffruneio v0.2.0/go.mod h1:JkE26KsDizTr40EUHkXVtNPvgGtbSNq5BcowyYOWdKo=
 github.com/pelletier/go-toml v1.2.0/go.mod h1:5z9KED0ma1S8pY6P1sdut58dfprrGBbd/94hg7ilaic=
 github.com/performancecopilot/speed v3.0.0+incompatible/go.mod h1:/CLtqpZ5gBg1M9iaPbIdPPGyKcA8hKdoy6hAWba7Yac=

go.sum

@@ -307,6 +307,7 @@ github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/go-configfs-tsm v0.3.3-0.20240919001351-b4b5b84fdcbc h1:SG12DWUUM5igxm+//YX5Yq4vhdoRnOG9HkCodkOn+YU=
+github.com/google/go-configfs-tsm v0.3.3-0.20240919001351-b4b5b84fdcbc/go.mod h1:EL1GTDFMb5PZQWDviGfZV9n87WeGTR/JUg13RfwkgRo=
 github.com/google/go-eventlog v0.0.2-0.20241003021507-01bb555f7cba h1:05m5+kgZjxYUZrx3bZfkKHl6wkch+Khao6N21rFHInk=
 github.com/google/go-eventlog v0.0.2-0.20241003021507-01bb555f7cba/go.mod h1:7huE5P8w2NTObSwSJjboHmB7ioBNblkijdzoVa2skfQ=
 github.com/google/go-github/v28 v28.1.1/go.mod h1:bsqJWQX05omyWVmc00nEUql9mhQyv38lDZ8kPZcQVoM=
@@ -317,6 +318,7 @@ github.com/google/go-replayers/httpreplay v0.1.0/go.mod h1:YKZViNhiGgqdBlUbI2MwG
 github.com/google/go-sev-guest v0.11.2-0.20241009005433-de2ac900e958 h1:GfnkFZNr80qFGLR/EY75zwk8puz8+frGj4iwPwnJbSU=
 github.com/google/go-sev-guest v0.11.2-0.20241009005433-de2ac900e958/go.mod h1:8+UOtSaqVIZjJJ9DDmgRko3J/kNc6jI5KLHxoeao7cA=
 github.com/google/go-tdx-guest v0.3.2-0.20241009005452-097ee70d0843 h1:+MoPobRN9HrDhGyn6HnF5NYo4uMBKaiFqAtf/D/OB4A=
+github.com/google/go-tdx-guest v0.3.2-0.20241009005452-097ee70d0843/go.mod h1:g/n8sKITIT9xRivBUbizo34DTsUm2nN2uU3A662h09g=
 github.com/google/go-tpm v0.9.0 h1:sQF6YqWMi+SCXpsmS3fd21oPy/vSddwZry4JnmltHVk=
 github.com/google/go-tpm v0.9.0/go.mod h1:FkNVkc6C+IsvDI9Jw1OveJmxGZUUaKxtrpOS47QWKfU=
 github.com/google/go-tspi v0.3.0 h1:ADtq8RKfP+jrTyIWIZDIYcKOMecRqNJFOew2IT0Inus=
@@ -865,6 +867,7 @@ golang.org/x/net v0.0.0-20210316092652-d523dce5a7f4/go.mod h1:RBQZq4jEuRlivfhVLd
 golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
 golang.org/x/net v0.0.0-20210503060351-7fd8e65b6420/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/net v0.27.0 h1:5K3Njcw06/l2y9vpGCSdcxWOYHOUk3dVNGDXN+FvAys=
+golang.org/x/net v0.27.0/go.mod h1:dDi0PyhWNoiUOrAS8uXv/vnScO4wnHQO4mj9fn/RytE=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20181106182150-f42d05182288/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
@@ -1169,6 +1172,7 @@ google.golang.org/genproto v0.0.0-20210805201207-89edb61ffb67/go.mod h1:ob2IJxKr
 google.golang.org/genproto v0.0.0-20210813162853-db860fec028c/go.mod h1:cFeNkxwySK631ADgubI+/XFU/xp8FD5KIVV4rj8UC5w=
 google.golang.org/genproto v0.0.0-20210821163610-241b8fcbd6c8/go.mod h1:eFjDcFEctNawg4eG61bRv87N7iHBWyVhJu7u1kqDUXY=
 google.golang.org/genproto/googleapis/rpc v0.0.0-20240722135656-d784300faade h1:oCRSWfwGXQsqlVdErcyTt4A93Y8fo0/9D4b1gnI++qo=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240722135656-d784300faade/go.mod h1:Ue6ibwXGpU+dqIcODieyLOcgj7z8+IcskoNIgZxtrFY=
 google.golang.org/grpc v1.8.0/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
 google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
@@ -1202,6 +1206,7 @@ google.golang.org/grpc v1.39.0/go.mod h1:PImNr+rS9TWYb2O4/emRugxiyHZ5JyHW5F+RPnD
 google.golang.org/grpc v1.39.1/go.mod h1:PImNr+rS9TWYb2O4/emRugxiyHZ5JyHW5F+RPnDzfrE=
 google.golang.org/grpc v1.40.0/go.mod h1:ogyxbiOoUXAkP+4+xa6PZSE9DZgIHtSpzjDTB9KAK34=
 google.golang.org/grpc v1.64.1 h1:LKtvyfbX3UGVPFcGqJ9ItpVWW6oN/2XqTxfAnwRRXiA=
+google.golang.org/grpc v1.64.1/go.mod h1:hiQF4LFZelK2WKaP6W0L92zGHtiQdZxk8CrSdvyjeP0=
 google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.1.0/go.mod h1:6Kw0yEErY5E/yWrBtf03jp27GLLJujG4z/JK95pnjjw=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=