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openssl3/0006-Disable-signature-veri...

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From 3f9deff30ae6efbfe979043b00cdf649b39793c0 Mon Sep 17 00:00:00 2001
From: Tomas Mraz <tmraz@fedoraproject.org>
Date: Thu, 24 Sep 2020 09:51:34 +0200
Subject: Disable signature verification with totally unsafe hash algorithms
(was openssl-1.1.1-no-weak-verify.patch)
---
crypto/asn1/a_verify.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/crypto/asn1/a_verify.c b/crypto/asn1/a_verify.c
index b7eed914b0..af62f0ef08 100644
--- a/crypto/asn1/a_verify.c
+++ b/crypto/asn1/a_verify.c
@@ -152,6 +152,11 @@ int ASN1_item_verify_ctx(const ASN1_ITEM *it, const X509_ALGOR *alg,
ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
if (ret <= 1)
goto err;
+ } else if ((mdnid == NID_md5
+ && ossl_safe_getenv("OPENSSL_ENABLE_MD5_VERIFY") == NULL) ||
+ mdnid == NID_md4 || mdnid == NID_md2 || mdnid == NID_sha) {
+ ERR_raise(ERR_LIB_ASN1, ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
+ goto err;
} else {
const EVP_MD *type = EVP_get_digestbynid(mdnid);
--
2.26.2