go/src/crypto/x509/verify_test.go

// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package x509

import (
	"crypto/x509/pkix"
	"encoding/pem"
	"errors"
	"fmt"
	"runtime"
	"strings"
	"testing"
	"time"
)

var supportSHA2 = true

type verifyTest struct {
	leaf                 string
	intermediates        []string
	roots                []string
	currentTime          int64
	dnsName              string
	systemSkip           bool
	keyUsages            []ExtKeyUsage
	testSystemRootsError bool
	sha2                 bool

	errorCallback  func(*testing.T, int, error) bool
	expectedChains [][]string
}

var verifyTests = []verifyTest{
	{
		leaf:                 googleLeaf,
		intermediates:        []string{giag2Intermediate},
		currentTime:          1395785200,
		dnsName:              "www.google.com",
		testSystemRootsError: true,

		// Without any roots specified we should get a system roots
		// error.
		errorCallback: expectSystemRootsError,
	},
	{
		leaf:          googleLeaf,
		intermediates: []string{giag2Intermediate},
		roots:         []string{geoTrustRoot},
		currentTime:   1395785200,
		dnsName:       "www.google.com",

		expectedChains: [][]string{
			{"Google", "Google Internet Authority", "GeoTrust"},
		},
	},
	{
		leaf:          googleLeaf,
		intermediates: []string{giag2Intermediate},
		roots:         []string{geoTrustRoot},
		currentTime:   1395785200,
		dnsName:       "WwW.GooGLE.coM",

		expectedChains: [][]string{
			{"Google", "Google Internet Authority", "GeoTrust"},
		},
	},
	{
		leaf:          googleLeaf,
		intermediates: []string{giag2Intermediate},
		roots:         []string{geoTrustRoot},
		currentTime:   1395785200,
		dnsName:       "www.example.com",

		errorCallback: expectHostnameError,
	},
	{
		leaf:          googleLeaf,
		intermediates: []string{giag2Intermediate},
		roots:         []string{geoTrustRoot},
		currentTime:   1,
		dnsName:       "www.example.com",

		errorCallback: expectExpired,
	},
	{
		leaf:        googleLeaf,
		roots:       []string{geoTrustRoot},
		currentTime: 1395785200,
		dnsName:     "www.google.com",

		// Skip when using systemVerify, since Windows
		// *will* find the missing intermediate cert.
		systemSkip:    true,
		errorCallback: expectAuthorityUnknown,
	},
	{
		leaf:          googleLeaf,
		intermediates: []string{geoTrustRoot, giag2Intermediate},
		roots:         []string{geoTrustRoot},
		currentTime:   1395785200,
		dnsName:       "www.google.com",

		expectedChains: [][]string{
			{"Google", "Google Internet Authority", "GeoTrust"},
			// TODO(agl): this is ok, but it would be nice if the
			//            chain building didn't visit the same SPKI
			//            twice.
			{"Google", "Google Internet Authority", "GeoTrust", "GeoTrust"},
		},
		// CAPI doesn't build the chain with the duplicated GeoTrust
		// entry so the results don't match. Thus we skip this test
		// until that's fixed.
		systemSkip: true,
	},
	{
		leaf:          dnssecExpLeaf,
		intermediates: []string{startComIntermediate},
		roots:         []string{startComRoot},
		currentTime:   1302726541,

		expectedChains: [][]string{
			{"dnssec-exp", "StartCom Class 1", "StartCom Certification Authority"},
		},
	},
	{
		leaf:          dnssecExpLeaf,
		intermediates: []string{startComIntermediate, startComRoot},
		roots:         []string{startComRoot},
		currentTime:   1302726541,

		// Skip when using systemVerify, since Windows
		// can only return a single chain to us (for now).
		systemSkip: true,
		expectedChains: [][]string{
			{"dnssec-exp", "StartCom Class 1", "StartCom Certification Authority"},
			{"dnssec-exp", "StartCom Class 1", "StartCom Certification Authority", "StartCom Certification Authority"},
		},
	},
	{
		leaf:          googleLeafWithInvalidHash,
		intermediates: []string{giag2Intermediate},
		roots:         []string{geoTrustRoot},
		currentTime:   1395785200,
		dnsName:       "www.google.com",

		// The specific error message may not occur when using system
		// verification.
		systemSkip:    true,
		errorCallback: expectHashError,
	},
	{
		// The default configuration should reject an S/MIME chain.
		leaf:        smimeLeaf,
		roots:       []string{smimeIntermediate},
		currentTime: 1339436154,

		// Key usage not implemented for Windows yet.
		systemSkip:    true,
		errorCallback: expectUsageError,
	},
	{
		leaf:        smimeLeaf,
		roots:       []string{smimeIntermediate},
		currentTime: 1339436154,
		keyUsages:   []ExtKeyUsage{ExtKeyUsageServerAuth},

		// Key usage not implemented for Windows yet.
		systemSkip:    true,
		errorCallback: expectUsageError,
	},
	{
		leaf:        smimeLeaf,
		roots:       []string{smimeIntermediate},
		currentTime: 1339436154,
		keyUsages:   []ExtKeyUsage{ExtKeyUsageEmailProtection},

		// Key usage not implemented for Windows yet.
		systemSkip: true,
		expectedChains: [][]string{
			{"Ryan Hurst", "GlobalSign PersonalSign 2 CA - G2"},
		},
	},
	{
		leaf:          megaLeaf,
		intermediates: []string{comodoIntermediate1},
		roots:         []string{comodoRoot},
		currentTime:   1360431182,

		// CryptoAPI can find alternative validation paths so we don't
		// perform this test with system validation.
		systemSkip: true,
		expectedChains: [][]string{
			{"mega.co.nz", "EssentialSSL CA", "COMODO Certification Authority"},
		},
	},
	{
		// Check that a name constrained intermediate works even when
		// it lists multiple constraints.
		leaf:          nameConstraintsLeaf,
		intermediates: []string{nameConstraintsIntermediate1, nameConstraintsIntermediate2},
		roots:         []string{globalSignRoot},
		currentTime:   1382387896,
		dnsName:       "secure.iddl.vt.edu",

		expectedChains: [][]string{
			{
				"Technology-enhanced Learning and Online Strategies",
				"Virginia Tech Global Qualified Server CA",
				"Trusted Root CA G2",
				"GlobalSign Root CA",
			},
		},
	},
	{
		// Check that SHA-384 intermediates (which are popping up)
		// work.
		leaf:          moipLeafCert,
		intermediates: []string{comodoIntermediateSHA384, comodoRSAAuthority},
		roots:         []string{addTrustRoot},
		currentTime:   1397502195,
		dnsName:       "api.moip.com.br",

		// CryptoAPI can find alternative validation paths so we don't
		// perform this test with system validation.
		systemSkip: true,

		sha2: true,
		expectedChains: [][]string{
			{
				"api.moip.com.br",
				"COMODO RSA Extended Validation Secure Server CA",
				"COMODO RSA Certification Authority",
				"AddTrust External CA Root",
			},
		},
	},
	{
		// Putting a certificate as a root directly should work as a
		// way of saying “exactly this”.
		leaf:        selfSigned,
		roots:       []string{selfSigned},
		currentTime: 1471624472,
		dnsName:     "foo.example",
		systemSkip:  true,

		expectedChains: [][]string{
			{"Acme Co"},
		},
	},
	{
		// Putting a certificate as a root directly should not skip
		// other checks however.
		leaf:        selfSigned,
		roots:       []string{selfSigned},
		currentTime: 1471624472,
		dnsName:     "notfoo.example",
		systemSkip:  true,

		errorCallback: expectHostnameError,
	},
}

func expectHostnameError(t *testing.T, i int, err error) (ok bool) {
	if _, ok := err.(HostnameError); !ok {
		t.Errorf("#%d: error was not a HostnameError: %s", i, err)
		return false
	}
	return true
}

func expectExpired(t *testing.T, i int, err error) (ok bool) {
	if inval, ok := err.(CertificateInvalidError); !ok || inval.Reason != Expired {
		t.Errorf("#%d: error was not Expired: %s", i, err)
		return false
	}
	return true
}

func expectUsageError(t *testing.T, i int, err error) (ok bool) {
	if inval, ok := err.(CertificateInvalidError); !ok || inval.Reason != IncompatibleUsage {
		t.Errorf("#%d: error was not IncompatibleUsage: %s", i, err)
		return false
	}
	return true
}

func expectAuthorityUnknown(t *testing.T, i int, err error) (ok bool) {
	if _, ok := err.(UnknownAuthorityError); !ok {
		t.Errorf("#%d: error was not UnknownAuthorityError: %s", i, err)
		return false
	}
	return true
}

func expectSystemRootsError(t *testing.T, i int, err error) bool {
	if _, ok := err.(SystemRootsError); !ok {
		t.Errorf("#%d: error was not SystemRootsError: %s", i, err)
		return false
	}
	return true
}

func expectHashError(t *testing.T, i int, err error) bool {
	if err == nil {
		t.Errorf("#%d: no error resulted from invalid hash", i)
		return false
	}
	if expected := "algorithm unimplemented"; !strings.Contains(err.Error(), expected) {
		t.Errorf("#%d: error resulting from invalid hash didn't contain '%s', rather it was: %s", i, expected, err)
		return false
	}
	return true
}

func certificateFromPEM(pemBytes string) (*Certificate, error) {
	block, _ := pem.Decode([]byte(pemBytes))
	if block == nil {
		return nil, errors.New("failed to decode PEM")
	}
	return ParseCertificate(block.Bytes)
}

func testVerify(t *testing.T, useSystemRoots bool) {
	for i, test := range verifyTests {
		if useSystemRoots && test.systemSkip {
			continue
		}
		if runtime.GOOS == "windows" && test.testSystemRootsError {
			continue
		}
		if useSystemRoots && !supportSHA2 && test.sha2 {
			continue
		}

		opts := VerifyOptions{
			Intermediates: NewCertPool(),
			DNSName:       test.dnsName,
			CurrentTime:   time.Unix(test.currentTime, 0),
			KeyUsages:     test.keyUsages,
		}

		if !useSystemRoots {
			opts.Roots = NewCertPool()
			for j, root := range test.roots {
				ok := opts.Roots.AppendCertsFromPEM([]byte(root))
				if !ok {
					t.Errorf("#%d: failed to parse root #%d", i, j)
					return
				}
			}
		}

		for j, intermediate := range test.intermediates {
			ok := opts.Intermediates.AppendCertsFromPEM([]byte(intermediate))
			if !ok {
				t.Errorf("#%d: failed to parse intermediate #%d", i, j)
				return
			}
		}

		leaf, err := certificateFromPEM(test.leaf)
		if err != nil {
			t.Errorf("#%d: failed to parse leaf: %s", i, err)
			return
		}

		var oldSystemRoots *CertPool
		if test.testSystemRootsError {
			oldSystemRoots = systemRootsPool()
			systemRoots = nil
			opts.Roots = nil
		}

		chains, err := leaf.Verify(opts)

		if test.testSystemRootsError {
			systemRoots = oldSystemRoots
		}

		if test.errorCallback == nil && err != nil {
			t.Errorf("#%d: unexpected error: %s", i, err)
		}
		if test.errorCallback != nil {
			if !test.errorCallback(t, i, err) {
				return
			}
		}

		if len(chains) != len(test.expectedChains) {
			t.Errorf("#%d: wanted %d chains, got %d", i, len(test.expectedChains), len(chains))
		}

		// We check that each returned chain matches a chain from
		// expectedChains but an entry in expectedChains can't match
		// two chains.
		seenChains := make([]bool, len(chains))
	NextOutputChain:
		for _, chain := range chains {
		TryNextExpected:
			for j, expectedChain := range test.expectedChains {
				if seenChains[j] {
					continue
				}
				if len(chain) != len(expectedChain) {
					continue
				}
				for k, cert := range chain {
					if !strings.Contains(nameToKey(&cert.Subject), expectedChain[k]) {
						continue TryNextExpected
					}
				}
				// we matched
				seenChains[j] = true
				continue NextOutputChain
			}
			t.Errorf("#%d: No expected chain matched %s", i, chainToDebugString(chain))
		}
	}
}

func TestGoVerify(t *testing.T) {
	testVerify(t, false)
}

func TestSystemVerify(t *testing.T) {
	if runtime.GOOS != "windows" {
		t.Skipf("skipping verify test using system APIs on %q", runtime.GOOS)
	}

	testVerify(t, true)
}

func chainToDebugString(chain []*Certificate) string {
	var chainStr string
	for _, cert := range chain {
		if len(chainStr) > 0 {
			chainStr += " -> "
		}
		chainStr += nameToKey(&cert.Subject)
	}
	return chainStr
}

func nameToKey(name *pkix.Name) string {
	return strings.Join(name.Country, ",") + "/" + strings.Join(name.Organization, ",") + "/" + strings.Join(name.OrganizationalUnit, ",") + "/" + name.CommonName
}

const geoTrustRoot = `-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
`

const giag2Intermediate = `-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
`

const googleLeaf = `-----BEGIN CERTIFICATE-----
MIIEdjCCA16gAwIBAgIIcR5k4dkoe04wDQYJKoZIhvcNAQEFBQAwSTELMAkGA1UE
BhMCVVMxEzARBgNVBAoTCkdvb2dsZSBJbmMxJTAjBgNVBAMTHEdvb2dsZSBJbnRl
cm5ldCBBdXRob3JpdHkgRzIwHhcNMTQwMzEyMDkzODMwWhcNMTQwNjEwMDAwMDAw
WjBoMQswCQYDVQQGEwJVUzETMBEGA1UECAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwN
TW91bnRhaW4gVmlldzETMBEGA1UECgwKR29vZ2xlIEluYzEXMBUGA1UEAwwOd3d3
Lmdvb2dsZS5jb20wggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQC4zYCe
m0oUBhwE0EwBr65eBOcgcQO2PaSIAB2dEP/c1EMX2tOy0ov8rk83ePhJ+MWdT1z6
jge9X4zQQI8ZyA9qIiwrKBZOi8DNUvrqNZC7fJAVRrb9aX/99uYOJCypIbpmWG1q
fhbHjJewhwf8xYPj71eU4rLG80a+DapWmphtfq3h52lDQIBzLVf1yYbyrTaELaz4
NXF7HXb5YkId/gxIsSzM0aFUVu2o8sJcLYAsJqwfFKBKOMxUcn545nlspf0mTcWZ
0APlbwsKznNs4/xCDwIxxWjjqgHrYAFl6y07i1gzbAOqdNEyR24p+3JWI8WZBlBI
dk2KGj0W1fIfsvyxAgMBAAGjggFBMIIBPTAdBgNVHSUEFjAUBggrBgEFBQcDAQYI
KwYBBQUHAwIwGQYDVR0RBBIwEIIOd3d3Lmdvb2dsZS5jb20waAYIKwYBBQUHAQEE
XDBaMCsGCCsGAQUFBzAChh9odHRwOi8vcGtpLmdvb2dsZS5jb20vR0lBRzIuY3J0
MCsGCCsGAQUFBzABhh9odHRwOi8vY2xpZW50czEuZ29vZ2xlLmNvbS9vY3NwMB0G
A1UdDgQWBBTXD5Bx6iqT+dmEhbFL4OUoHyZn8zAMBgNVHRMBAf8EAjAAMB8GA1Ud
IwQYMBaAFErdBhYbvPZotXb1gba7Yhq6WoEvMBcGA1UdIAQQMA4wDAYKKwYBBAHW
eQIFATAwBgNVHR8EKTAnMCWgI6Ahhh9odHRwOi8vcGtpLmdvb2dsZS5jb20vR0lB
RzIuY3JsMA0GCSqGSIb3DQEBBQUAA4IBAQCR3RJtHzgDh33b/MI1ugiki+nl8Ikj
5larbJRE/rcA5oite+QJyAr6SU1gJJ/rRrK3ItVEHr9L621BCM7GSdoNMjB9MMcf
tJAW0kYGJ+wqKm53wG/JaOADTnnq2Mt/j6F2uvjgN/ouns1nRHufIvd370N0LeH+
orKqTuAPzXK7imQk6+OycYABbqCtC/9qmwRd8wwn7sF97DtYfK8WuNHtFalCAwyi
8LxJJYJCLWoMhZ+V8GZm+FOex5qkQAjnZrtNlbQJ8ro4r+rpKXtmMFFhfa+7L+PA
Kom08eUK8skxAzfDDijZPh10VtJ66uBoiDPdT+uCBehcBIcmSTrKjFGX
-----END CERTIFICATE-----
`

// googleLeafWithInvalidHash is the same as googleLeaf, but the signature
// algorithm in the certificate contains a nonsense OID.
const googleLeafWithInvalidHash = `-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
`

const dnssecExpLeaf = `-----BEGIN CERTIFICATE-----
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Qibb2+CfKuQ+WFV1GkVQmVA=
-----END CERTIFICATE-----`

const startComIntermediate = `-----BEGIN CERTIFICATE-----
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0q6Dp6jOW6c=
-----END CERTIFICATE-----`

const startComRoot = `-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----`

const smimeLeaf = `-----BEGIN CERTIFICATE-----
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d/eF7xeg7TKPWC5xyOFp9SdMolJM7LTC3wnSO3frBAev+q/nGs9Xxyvs
-----END CERTIFICATE-----`

const smimeIntermediate = `-----BEGIN CERTIFICATE-----
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jUY+v9vLQXmaVwI0AYL7g9LN
-----END CERTIFICATE-----`

var nameConstraintsIntermediate2 = `-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----`

var globalSignRoot = `-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----`

var moipLeafCert = `-----BEGIN CERTIFICATE-----
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jhuy8PqqZS9OuLilTeLu4a8z2JI=
-----END CERTIFICATE-----`

var comodoIntermediateSHA384 = `-----BEGIN CERTIFICATE-----
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teoiccsq8FZ8/qyo0QYPFBRSTP5kKwxpKrgNUG4+BAe/eiCL+O5lCeHHSQgyPQ0o
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pLwltum95OmYdBbxN4SBB7SC
-----END CERTIFICATE-----`

const comodoRSAAuthority = `-----BEGIN CERTIFICATE-----
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bmFsQ0FSb290LmNybDA1BggrBgEFBQcBAQQpMCcwJQYIKwYBBQUHMAGGGWh0dHA6
Ly9vY3NwLnVzZXJ0cnVzdC5jb20wDQYJKoZIhvcNAQEMBQADggEBAGS/g/FfmoXQ
zbihKVcN6Fr30ek+8nYEbvFScLsePP9NDXRqzIGCJdPDoCpdTPW6i6FtxFQJdcfj
Jw5dhHk3QBN39bSsHNA7qxcS1u80GH4r6XnTq1dFDK8o+tDb5VCViLvfhVdpfZLY
Uspzgb8c8+a4bmYRBbMelC1/kZWSWfFMzqORcUx8Rww7Cxn2obFshj5cqsQugsv5
B5a6SE2Q8pTIqXOi6wZ7I53eovNNVZ96YUWYGGjHXkBrI/V5eu+MtWuLt29G9Hvx
PUsE2JOAWVrgQSQdso8VYFhH2+9uRv0V9dlfmrPb2LjkQLPNlzmuhbsdjrzch5vR
pu/xO28QOG8=
-----END CERTIFICATE-----`

const addTrustRoot = `-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----`

const selfSigned = `-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----`

var unknownAuthorityErrorTests = []struct {
	cert     string
	expected string
}{
	{selfSignedWithCommonName, "x509: certificate signed by unknown authority (possibly because of \"empty\" while trying to verify candidate authority certificate \"test\")"},
	{selfSignedNoCommonNameWithOrgName, "x509: certificate signed by unknown authority (possibly because of \"empty\" while trying to verify candidate authority certificate \"ca\")"},
	{selfSignedNoCommonNameNoOrgName, "x509: certificate signed by unknown authority (possibly because of \"empty\" while trying to verify candidate authority certificate \"serial:0\")"},
}

func TestUnknownAuthorityError(t *testing.T) {
	for i, tt := range unknownAuthorityErrorTests {
		der, _ := pem.Decode([]byte(tt.cert))
		if der == nil {
			t.Errorf("#%d: Unable to decode PEM block", i)
		}
		c, err := ParseCertificate(der.Bytes)
		if err != nil {
			t.Errorf("#%d: Unable to parse certificate -> %s", i, err)
		}
		uae := &UnknownAuthorityError{
			cert:     c,
			hintErr:  fmt.Errorf("empty"),
			hintCert: c,
		}
		actual := uae.Error()
		if strings.Compare(actual, tt.expected) != 0 {
			t.Errorf("#%d: UnknownAuthorityError.Error() response invalid actual: %s expected: %s", i, actual, tt.expected)
		}
	}
}

const selfSignedWithCommonName = `-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----`
const selfSignedNoCommonNameWithOrgName = `-----BEGIN CERTIFICATE-----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=
-----END CERTIFICATE-----`
const selfSignedNoCommonNameNoOrgName = `-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----`