crypto: move certificate verification into x509.
People have a need to verify certificates in situations other than TLS
client handshaking. Thus this CL moves certificate verification into
x509 and expands its abilities.
R=bradfitzgo
CC=golang-dev
https://golang.org/cl/4407046
diff --git a/src/pkg/crypto/x509/verify_test.go b/src/pkg/crypto/x509/verify_test.go
new file mode 100644
index 0000000..ca9f913
--- /dev/null
+++ b/src/pkg/crypto/x509/verify_test.go
@@ -0,0 +1,390 @@
+// 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 (
+ "encoding/pem"
+ "os"
+ "strings"
+ "testing"
+)
+
+type verifyTest struct {
+ leaf string
+ intermediates []string
+ roots []string
+ currentTime int64
+ dnsName string
+
+ errorCallback func(*testing.T, int, os.Error) bool
+ expectedChains [][]string
+}
+
+var verifyTests = []verifyTest{
+ {
+ leaf: googleLeaf,
+ intermediates: []string{thawteIntermediate},
+ roots: []string{verisignRoot},
+ currentTime: 1302726541,
+ dnsName: "www.google.com",
+
+ expectedChains: [][]string{
+ []string{"Google", "Thawte", "VeriSign"},
+ },
+ },
+ {
+ leaf: googleLeaf,
+ intermediates: []string{thawteIntermediate},
+ roots: []string{verisignRoot},
+ currentTime: 1302726541,
+ dnsName: "www.example.com",
+
+ errorCallback: expectHostnameError,
+ },
+ {
+ leaf: googleLeaf,
+ intermediates: []string{thawteIntermediate},
+ roots: []string{verisignRoot},
+ currentTime: 1,
+ dnsName: "www.example.com",
+
+ errorCallback: expectExpired,
+ },
+ {
+ leaf: googleLeaf,
+ roots: []string{verisignRoot},
+ currentTime: 1302726541,
+ dnsName: "www.google.com",
+
+ errorCallback: expectAuthorityUnknown,
+ },
+ {
+ leaf: googleLeaf,
+ intermediates: []string{verisignRoot, thawteIntermediate},
+ roots: []string{verisignRoot},
+ currentTime: 1302726541,
+ dnsName: "www.google.com",
+
+ expectedChains: [][]string{
+ []string{"Google", "Thawte", "VeriSign"},
+ },
+ },
+ {
+ leaf: googleLeaf,
+ intermediates: []string{verisignRoot, thawteIntermediate},
+ roots: []string{verisignRoot},
+ currentTime: 1302726541,
+
+ expectedChains: [][]string{
+ []string{"Google", "Thawte", "VeriSign"},
+ },
+ },
+ {
+ leaf: dnssecExpLeaf,
+ intermediates: []string{startComIntermediate},
+ roots: []string{startComRoot},
+ currentTime: 1302726541,
+
+ expectedChains: [][]string{
+ []string{"dnssec-exp", "StartCom Class 1", "StartCom Certification Authority"},
+ },
+ },
+}
+
+func expectHostnameError(t *testing.T, i int, err os.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 os.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 expectAuthorityUnknown(t *testing.T, i int, err os.Error) (ok bool) {
+ if _, ok := err.(UnknownAuthorityError); !ok {
+ t.Errorf("#%d: error was not UnknownAuthorityError: %s", i, err)
+ return false
+ }
+ return true
+}
+
+func certificateFromPEM(pemBytes string) (*Certificate, os.Error) {
+ block, _ := pem.Decode([]byte(pemBytes))
+ if block == nil {
+ return nil, os.ErrorString("failed to decode PEM")
+ }
+ return ParseCertificate(block.Bytes)
+}
+
+func TestVerify(t *testing.T) {
+ for i, test := range verifyTests {
+ opts := VerifyOptions{
+ Roots: NewCertPool(),
+ Intermediates: NewCertPool(),
+ DNSName: test.dnsName,
+ CurrentTime: test.currentTime,
+ }
+
+ for j, root := range test.roots {
+ ok := opts.Roots.AppendCertsFromPEM([]byte(root))
+ if !ok {
+ t.Error("#%d: failed to parse root #%d", i, j)
+ return
+ }
+ }
+
+ for j, intermediate := range test.intermediates {
+ ok := opts.Intermediates.AppendCertsFromPEM([]byte(intermediate))
+ if !ok {
+ t.Error("#%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
+ }
+
+ chains, err := leaf.Verify(opts)
+
+ 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.Index(nameToKey(&cert.Subject), expectedChain[k]) == -1 {
+ continue TryNextExpected
+ }
+ }
+ // we matched
+ seenChains[j] = true
+ continue NextOutputChain
+ }
+ t.Errorf("#%d: No expected chain matched %s", i, chainToDebugString(chain))
+ }
+ }
+}
+
+func chainToDebugString(chain []*Certificate) string {
+ var chainStr string
+ for _, cert := range chain {
+ if len(chainStr) > 0 {
+ chainStr += " -> "
+ }
+ chainStr += nameToKey(&cert.Subject)
+ }
+ return chainStr
+}
+
+const verisignRoot = `-----BEGIN CERTIFICATE-----
+MIICPDCCAaUCEHC65B0Q2Sk0tjjKewPMur8wDQYJKoZIhvcNAQECBQAwXzELMAkG
+A1UEBhMCVVMxFzAVBgNVBAoTDlZlcmlTaWduLCBJbmMuMTcwNQYDVQQLEy5DbGFz
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+AA9WjQKZ7aKQRUzkuxCkPfAyAw7xzvjoyVGM5mKf5p/AfbdynMk2OmufTqj/ZA1k
+-----END CERTIFICATE-----
+`
+
+const thawteIntermediate = `-----BEGIN CERTIFICATE-----
+MIIDIzCCAoygAwIBAgIEMAAAAjANBgkqhkiG9w0BAQUFADBfMQswCQYDVQQGEwJV
+UzEXMBUGA1UEChMOVmVyaVNpZ24sIEluYy4xNzA1BgNVBAsTLkNsYXNzIDMgUHVi
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+bcV0oveifHtgPHfNDs5IAn8BL7abN+AqKjbc1YXWrOU/VG+WHgWv
+-----END CERTIFICATE-----
+`
+
+const googleLeaf = `-----BEGIN CERTIFICATE-----
+MIIDITCCAoqgAwIBAgIQL9+89q6RUm0PmqPfQDQ+mjANBgkqhkiG9w0BAQUFADBM
+MQswCQYDVQQGEwJaQTElMCMGA1UEChMcVGhhd3RlIENvbnN1bHRpbmcgKFB0eSkg
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+z5nRUP8pJcA2NhUzUnC+MY+f6H/nEQyNv4SgQhqAibAxWEEHXw==
+-----END CERTIFICATE-----`
+
+const dnssecExpLeaf = `-----BEGIN CERTIFICATE-----
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+Qibb2+CfKuQ+WFV1GkVQmVA=
+-----END CERTIFICATE-----`
+
+const startComIntermediate = `-----BEGIN CERTIFICATE-----
+MIIGNDCCBBygAwIBAgIBGDANBgkqhkiG9w0BAQUFADB9MQswCQYDVQQGEwJJTDEW
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+0q6Dp6jOW6c=
+-----END CERTIFICATE-----`
+
+const startComRoot = `-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----`
