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crypto/x509: disable signing with MD5WithRSA

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MD5 is hopelessly broken, we already don't allow verification of
MD5 signatures, we shouldn't support generating them.

Fixes #42125

Change-Id: Ib25d750e6fc72a03198a505ac71e6d2c99eff2ed
Reviewed-on: https://go-review.googlesource.com/c/go/+/285872
Run-TryBot: Roland Shoemaker <roland@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Roland Shoemaker 2021-01-22 10:16:24 -08:00
parent 485a572243
commit fdb640b7a1
2 changed files with 8 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
src/crypto/x509/x509.go
View File

@ -1397,6 +1397,10 @@ func signingParamsForPublicKey(pub any, requestedSigAlgo SignatureAlgorithm) (ha
err = errors.New("x509: cannot sign with hash function requested")
return
}
if hashFunc == crypto.MD5 {
err = errors.New("x509: signing with MD5 is not supported")
return
}
if requestedSigAlgo.isRSAPSS() {
sigAlgo.Parameters = hashToPSSParameters[hashFunc]
}
@ -1591,15 +1595,8 @@ func CreateCertificate(rand io.Reader, template, parent *Certificate, pub, priv
}
// Check the signature to ensure the crypto.Signer behaved correctly.
sigAlg := getSignatureAlgorithmFromAI(signatureAlgorithm)
switch sigAlg {
case MD5WithRSA:
// We skip the check if the signature algorithm is only supported for
// signing, not verification.
default:
if err := checkSignature(sigAlg, c.Raw, signature, key.Public(), true); err != nil {
return nil, fmt.Errorf("x509: signature over certificate returned by signer is invalid: %w", err)
}
if err := checkSignature(getSignatureAlgorithmFromAI(signatureAlgorithm), c.Raw, signature, key.Public(), true); err != nil {
return nil, fmt.Errorf("x509: signature over certificate returned by signer is invalid: %w", err)
}
return signedCert, nil

4
src/crypto/x509/x509_test.go
View File

@ -2929,8 +2929,8 @@ func TestCreateCertificateLegacy(t *testing.T) {
SignatureAlgorithm: sigAlg,
}
_, err := CreateCertificate(rand.Reader, template, template, testPrivateKey.Public(), &brokenSigner{testPrivateKey.Public()})
if err != nil {
t.Fatalf("CreateCertificate failed when SignatureAlgorithm = %v: %s", sigAlg, err)
if err == nil {
t.Fatal("CreateCertificate didn't fail when SignatureAlgorithm = MD5WithRSA")
}
}