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crypto/x509: remove x509sha1 GODEBUG 

Fixes #41682

Change-Id: I37760f2186e75ec7df9674db25ae466cf453d66d
Reviewed-on: https://go-review.googlesource.com/c/go/+/629676
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
This commit is contained in:
Roland Shoemaker 2024-11-19 11:34:19 -08:00
parent c901d93fcd
commit 7c7170e939
7 changed files with 134 additions and 352 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
doc/godebug.md
View File

@ -188,6 +188,9 @@ calling into Go code from C will enable DIT, and disable it before returning to
C if it was not enabled when Go code was entered. C if it was not enabled when Go code was entered.
This currently only affects arm64 programs. For all other platforms it is a no-op. This currently only affects arm64 programs. For all other platforms it is a no-op.
Go 1.24 removed the `x509sha1` setting. `crypto/x509` no longer supports verifying
signatures on certificates that use SHA-1 based signature algorithms.
### Go 1.23 ### Go 1.23
Go 1.23 changed the channels created by package time to be unbuffered Go 1.23 changed the channels created by package time to be unbuffered

1
src/crypto/x509/root_unix_test.go
View File

@ -151,7 +151,6 @@ func TestLoadSystemCertsLoadColonSeparatedDirs(t *testing.T) {
rootPEMs := []string{ rootPEMs := []string{
gtsRoot, gtsRoot,
googleLeaf, googleLeaf,
startComRoot,
} }
var certDirs []string var certDirs []string

449
src/crypto/x509/verify_test.go
View File

@ -134,45 +134,6 @@ var verifyTests = []verifyTest{
// entry so the results don't match. // entry so the results don't match.
systemLax: true, systemLax: true,
}, },
{
name: "dnssec-exp",
leaf: dnssecExpLeaf,
intermediates: []string{startComIntermediate},
roots: []string{startComRoot},
currentTime: 1302726541,
// The StartCom root is not trusted by Windows when the default
// ServerAuth EKU is requested.
systemSkip: true,
expectedChains: [][]string{
{"dnssec-exp", "StartCom Class 1", "StartCom Certification Authority"},
},
},
{
name: "dnssec-exp/AnyEKU",
leaf: dnssecExpLeaf,
intermediates: []string{startComIntermediate},
roots: []string{startComRoot},
currentTime: 1302726541,
keyUsages: []ExtKeyUsage{ExtKeyUsageAny},
expectedChains: [][]string{
{"dnssec-exp", "StartCom Class 1", "StartCom Certification Authority"},
},
},
{
name: "dnssec-exp/RootInIntermediates",
leaf: dnssecExpLeaf,
intermediates: []string{startComIntermediate, startComRoot},
roots: []string{startComRoot},
currentTime: 1302726541,
systemSkip: true, // see dnssec-exp test
expectedChains: [][]string{
{"dnssec-exp", "StartCom Class 1", "StartCom Certification Authority"},
},
},
{ {
name: "InvalidHash", name: "InvalidHash",
leaf: googleLeafWithInvalidHash, leaf: googleLeafWithInvalidHash,
@ -227,15 +188,15 @@ var verifyTests = []verifyTest{
leaf: nameConstraintsLeaf, leaf: nameConstraintsLeaf,
intermediates: []string{nameConstraintsIntermediate1, nameConstraintsIntermediate2}, intermediates: []string{nameConstraintsIntermediate1, nameConstraintsIntermediate2},
roots: []string{globalSignRoot}, roots: []string{globalSignRoot},
currentTime: 1382387896, currentTime: 1524771953,
dnsName: "secure.iddl.vt.edu", dnsName: "udctest.ads.vt.edu",
expectedChains: [][]string{ expectedChains: [][]string{
{ {
"Technology-enhanced Learning and Online Strategies", "udctest.ads.vt.edu",
"Virginia Tech Global Qualified Server CA", "Virginia Tech Global Qualified Server CA",
"Trusted Root CA G2", "Trusted Root CA SHA256 G2",
"GlobalSign Root CA", "GlobalSign",
}, },
}, },
}, },
@ -552,10 +513,6 @@ func testVerify(t *testing.T, test verifyTest, useSystemRoots bool) {
} }
func TestGoVerify(t *testing.T) { func TestGoVerify(t *testing.T) {
// Temporarily enable SHA-1 verification since a number of test chains
// require it. TODO(filippo): regenerate test chains.
t.Setenv("GODEBUG", "x509sha1=1")
for _, test := range verifyTests { for _, test := range verifyTests {
t.Run(test.name, func(t *testing.T) { t.Run(test.name, func(t *testing.T) {
testVerify(t, test, false) testVerify(t, test, false)
@ -724,128 +681,6 @@ c78zEqNswn6xGKXpWF5xVwdFcsx9HKhJ6UAi2bQ/KQ1yb7LPUOR6wXXWrG1cLnNP
i8eNLnKL9PXQ+5SwJFCzfEhcIZuhzg== i8eNLnKL9PXQ+5SwJFCzfEhcIZuhzg==
-----END CERTIFICATE-----` -----END CERTIFICATE-----`
const dnssecExpLeaf = `-----BEGIN CERTIFICATE-----
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Qibb2+CfKuQ+WFV1GkVQmVA=
-----END CERTIFICATE-----`
const startComIntermediate = `-----BEGIN CERTIFICATE-----
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WtBbnySGBVFaaQNlQ0lxxeBvlDRr9hvYqbBMflPrj0jfyjO1SPo2ShpTpjMM0InN
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0q6Dp6jOW6c=
-----END CERTIFICATE-----`
const startComRoot = `-----BEGIN CERTIFICATE-----
MIIHyTCCBbGgAwIBAgIBATANBgkqhkiG9w0BAQUFADB9MQswCQYDVQQGEwJJTDEW
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NOsF/5oirpt9P/FlUQqmMGqz9IgcgA38corog14=
-----END CERTIFICATE-----`
const smimeLeaf = `-----BEGIN CERTIFICATE----- const smimeLeaf = `-----BEGIN CERTIFICATE-----
MIIIPDCCBiSgAwIBAgIQaMDxFS0pOMxZZeOBxoTJtjANBgkqhkiG9w0BAQsFADCB MIIIPDCCBiSgAwIBAgIQaMDxFS0pOMxZZeOBxoTJtjANBgkqhkiG9w0BAQsFADCB
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@ -971,168 +806,136 @@ QyYBNWNgVYkDOnXYukrZVP/u3oDYLdE41V4tC5h9Pmzb/CaIxw==
-----END CERTIFICATE-----` -----END CERTIFICATE-----`
var nameConstraintsLeaf = `-----BEGIN CERTIFICATE----- var nameConstraintsLeaf = `-----BEGIN CERTIFICATE-----
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var nameConstraintsIntermediate1 = `-----BEGIN CERTIFICATE----- var nameConstraintsIntermediate1 = `-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----` -----END CERTIFICATE-----`
var nameConstraintsIntermediate2 = `-----BEGIN CERTIFICATE----- var nameConstraintsIntermediate2 = `-----BEGIN CERTIFICATE-----
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tbbg0zMm3kyfQITRusMSg6IBsDJqOnjaiaKQRcXiD0Sk43ZXb2bUKMxC7+Td3QL4 7/hl3w/zWwKxWyKJNaF7tScD5nvtLUzyBpr++aztiyJ1WliWcS6W+V2gKg9rxEC/
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hcC8roQwkHT7HvfYBoc74FM= n+DIcSIo7yKy6MX9czbFWQ==
-----END CERTIFICATE-----` -----END CERTIFICATE-----`
var globalSignRoot = `-----BEGIN CERTIFICATE----- var globalSignRoot = `-----BEGIN CERTIFICATE-----
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HMUfpIBvFSDJ3gyICh3WZlXi/EjJKSZp4A== WD9f
-----END CERTIFICATE-----` -----END CERTIFICATE-----`
const digicertRoot = `-----BEGIN CERTIFICATE----- const digicertRoot = `-----BEGIN CERTIFICATE-----

19
src/crypto/x509/x509.go
View File

@ -799,18 +799,10 @@ var ErrUnsupportedAlgorithm = errors.New("x509: cannot verify signature: algorit
// An InsecureAlgorithmError indicates that the [SignatureAlgorithm] used to // An InsecureAlgorithmError indicates that the [SignatureAlgorithm] used to
// generate the signature is not secure, and the signature has been rejected. // generate the signature is not secure, and the signature has been rejected.
//
// To temporarily restore support for SHA-1 signatures, include the value
// "x509sha1=1" in the GODEBUG environment variable. Note that this option will
// be removed in a future release.
type InsecureAlgorithmError SignatureAlgorithm type InsecureAlgorithmError SignatureAlgorithm
func (e InsecureAlgorithmError) Error() string { func (e InsecureAlgorithmError) Error() string {
var override string return fmt.Sprintf("x509: cannot verify signature: insecure algorithm %v", SignatureAlgorithm(e))
if SignatureAlgorithm(e) == SHA1WithRSA || SignatureAlgorithm(e) == ECDSAWithSHA1 {
override = " (temporarily override with GODEBUG=x509sha1=1)"
}
return fmt.Sprintf("x509: cannot verify signature: insecure algorithm %v", SignatureAlgorithm(e)) + override
} }
// ConstraintViolationError results when a requested usage is not permitted by // ConstraintViolationError results when a requested usage is not permitted by
@ -887,8 +879,6 @@ func signaturePublicKeyAlgoMismatchError(expectedPubKeyAlgo PublicKeyAlgorithm,
return fmt.Errorf("x509: signature algorithm specifies an %s public key, but have public key of type %T", expectedPubKeyAlgo.String(), pubKey) return fmt.Errorf("x509: signature algorithm specifies an %s public key, but have public key of type %T", expectedPubKeyAlgo.String(), pubKey)
} }
var x509sha1 = godebug.New("x509sha1")
// checkSignature verifies that signature is a valid signature over signed from // checkSignature verifies that signature is a valid signature over signed from
// a crypto.PublicKey. // a crypto.PublicKey.
func checkSignature(algo SignatureAlgorithm, signed, signature []byte, publicKey crypto.PublicKey, allowSHA1 bool) (err error) { func checkSignature(algo SignatureAlgorithm, signed, signature []byte, publicKey crypto.PublicKey, allowSHA1 bool) (err error) {
@ -911,12 +901,9 @@ func checkSignature(algo SignatureAlgorithm, signed, signature []byte, publicKey
case crypto.MD5: case crypto.MD5:
return InsecureAlgorithmError(algo) return InsecureAlgorithmError(algo)
case crypto.SHA1: case crypto.SHA1:
// SHA-1 signatures are mostly disabled. See go.dev/issue/41682. // SHA-1 signatures are only allowed for CRLs and CSRs.
if !allowSHA1 { if !allowSHA1 {
if x509sha1.Value() != "1" { return InsecureAlgorithmError(algo)
return InsecureAlgorithmError(algo)
}
x509sha1.IncNonDefault()
} }
fallthrough fallthrough
default: default:

9
src/crypto/x509/x509_test.go
View File

@ -1817,8 +1817,8 @@ func TestInsecureAlgorithmErrorString(t *testing.T) {
want string want string
}{ }{
{MD5WithRSA, "x509: cannot verify signature: insecure algorithm MD5-RSA"}, {MD5WithRSA, "x509: cannot verify signature: insecure algorithm MD5-RSA"},
{SHA1WithRSA, "x509: cannot verify signature: insecure algorithm SHA1-RSA (temporarily override with GODEBUG=x509sha1=1)"}, {SHA1WithRSA, "x509: cannot verify signature: insecure algorithm SHA1-RSA"},
{ECDSAWithSHA1, "x509: cannot verify signature: insecure algorithm ECDSA-SHA1 (temporarily override with GODEBUG=x509sha1=1)"}, {ECDSAWithSHA1, "x509: cannot verify signature: insecure algorithm ECDSA-SHA1"},
{MD2WithRSA, "x509: cannot verify signature: insecure algorithm 1"}, {MD2WithRSA, "x509: cannot verify signature: insecure algorithm 1"},
{-1, "x509: cannot verify signature: insecure algorithm -1"}, {-1, "x509: cannot verify signature: insecure algorithm -1"},
{0, "x509: cannot verify signature: insecure algorithm 0"}, {0, "x509: cannot verify signature: insecure algorithm 0"},
@ -1899,11 +1899,6 @@ func TestSHA1(t *testing.T) {
if _, ok := err.(InsecureAlgorithmError); !ok { if _, ok := err.(InsecureAlgorithmError); !ok {
t.Fatalf("certificate verification returned %v (%T), wanted InsecureAlgorithmError", err, err) t.Fatalf("certificate verification returned %v (%T), wanted InsecureAlgorithmError", err, err)
} }
t.Setenv("GODEBUG", "x509sha1=1")
if err = cert.CheckSignatureFrom(cert); err != nil {
t.Fatalf("SHA-1 certificate did not verify with GODEBUG=x509sha1=1: %v", err)
}
} }
// certMissingRSANULL contains an RSA public key where the AlgorithmIdentifier // certMissingRSANULL contains an RSA public key where the AlgorithmIdentifier

1
src/internal/godebugs/table.go
View File

@ -61,7 +61,6 @@ var All = []Info{
{Name: "winsymlink", Package: "os", Changed: 22, Old: "0"}, {Name: "winsymlink", Package: "os", Changed: 22, Old: "0"},
{Name: "x509keypairleaf", Package: "crypto/tls", Changed: 23, Old: "0"}, {Name: "x509keypairleaf", Package: "crypto/tls", Changed: 23, Old: "0"},
{Name: "x509negativeserial", Package: "crypto/x509", Changed: 23, Old: "1"}, {Name: "x509negativeserial", Package: "crypto/x509", Changed: 23, Old: "1"},
{Name: "x509sha1", Package: "crypto/x509"},
{Name: "x509usefallbackroots", Package: "crypto/x509"}, {Name: "x509usefallbackroots", Package: "crypto/x509"},
{Name: "x509usepolicies", Package: "crypto/x509"}, {Name: "x509usepolicies", Package: "crypto/x509"},
{Name: "zipinsecurepath", Package: "archive/zip"}, {Name: "zipinsecurepath", Package: "archive/zip"},

4
src/runtime/metrics/doc.go
View File

@ -358,10 +358,6 @@ Below is the full list of supported metrics, ordered lexicographically.
package due to a non-default GODEBUG=x509negativeserial=... package due to a non-default GODEBUG=x509negativeserial=...
setting. setting.
/godebug/non-default-behavior/x509sha1:events
The number of non-default behaviors executed by the crypto/x509
package due to a non-default GODEBUG=x509sha1=... setting.
/godebug/non-default-behavior/x509usefallbackroots:events /godebug/non-default-behavior/x509usefallbackroots:events
The number of non-default behaviors executed by the crypto/x509 The number of non-default behaviors executed by the crypto/x509
package due to a non-default GODEBUG=x509usefallbackroots=... package due to a non-default GODEBUG=x509usefallbackroots=...