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Allow SHA1 usage in MGF1 for RSASSA-PSS signatures

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Resolves: rhbz#2031742
Signed-off-by: Clemens Lang <cllang@redhat.com>
This commit is contained in:
Clemens Lang 2022-02-23 16:56:08 +01:00
parent b33dfd3fc3
commit 53f53fedec
2 changed files with 99 additions and 23 deletions
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116
0049-Selectively-disallow-SHA1-signatures.patch
View File

@ -1,4 +1,4 @@
From 8cf6c9fce2446340f361138dfb55cb7cdcb4b776 Mon Sep 17 00:00:00 2001
From b4b38e64dc322b8852f65b73e337517e1e1d651f Mon Sep 17 00:00:00 2001
From: Clemens Lang <cllang@redhat.com>
Date: Mon, 21 Feb 2022 17:24:44 +0100
Subject: Selectively disallow SHA1 signatures
@ -36,17 +36,20 @@ signing arbitrary data).
Resolves: rhbz#2031742
---
crypto/evp/evp_cnf.c | 13 ++++
crypto/evp/m_sigver.c | 77 ++++++++++++++++++++++++
crypto/evp/pmeth_lib.c | 15 +++++
doc/man5/config.pod | 11 ++++
include/internal/cryptlib.h | 3 +-
include/internal/sslconf.h | 4 ++
providers/common/securitycheck.c | 18 ++++++
providers/common/securitycheck_default.c | 7 ++-
ssl/t1_lib.c | 8 +++
util/libcrypto.num | 2 +
10 files changed, 156 insertions(+), 2 deletions(-)
crypto/evp/evp_cnf.c | 13 ++++
crypto/evp/m_sigver.c | 77 +++++++++++++++++++
crypto/evp/pmeth_lib.c | 15 ++++
doc/man5/config.pod | 11 +++
include/internal/cryptlib.h | 3 +-
include/internal/sslconf.h | 4 +
providers/common/securitycheck.c | 20 +++++
providers/common/securitycheck_default.c | 9 ++-
providers/implementations/signature/dsa_sig.c | 11 ++-
.../implementations/signature/ecdsa_sig.c | 4 +
providers/implementations/signature/rsa_sig.c | 9 ++-
ssl/t1_lib.c | 8 ++
util/libcrypto.num | 2 +
13 files changed, 178 insertions(+), 8 deletions(-)
diff --git a/crypto/evp/evp_cnf.c b/crypto/evp/evp_cnf.c
index 0e7fe64cf9..b9d3b6d226 100644
@ -257,7 +260,7 @@ index fd7f7e3331..05464b0655 100644
+ int loadconfig);
#endif
diff --git a/providers/common/securitycheck.c b/providers/common/securitycheck.c
index 699ada7c52..c501466cdc 100644
index 699ada7c52..f3af62325d 100644
--- a/providers/common/securitycheck.c
+++ b/providers/common/securitycheck.c
@@ -19,6 +19,7 @@
@ -268,21 +271,23 @@ index 699ada7c52..c501466cdc 100644
/*
* FIPS requires a minimum security strength of 112 bits (for encryption or
@@ -235,6 +236,13 @@ int ossl_digest_get_approved_nid_with_sha1(OSSL_LIB_CTX *ctx, const EVP_MD *md,
@@ -235,6 +236,15 @@ int ossl_digest_get_approved_nid_with_sha1(OSSL_LIB_CTX *ctx, const EVP_MD *md,
mdnid = -1; /* disallowed by security checks */
}
# endif /* OPENSSL_NO_FIPS_SECURITYCHECKS */
+
+#ifndef FIPS_MODULE
+ if (mdnid == NID_sha1
+ && !ossl_ctx_legacy_digest_signatures_allowed(ctx, 0))
+ mdnid = -1; /* disallowed by security checks */
+ if (!ossl_ctx_legacy_digest_signatures_allowed(ctx, 0))
+ /* SHA1 is globally disabled, check whether we want to locally allow
+ * it. */
+ if (mdnid == NID_sha1 && !sha1_allowed)
+ mdnid = NID_undef;
+#endif
+
return mdnid;
}
@@ -244,5 +252,15 @@ int ossl_digest_is_allowed(OSSL_LIB_CTX *ctx, const EVP_MD *md)
@@ -244,5 +254,15 @@ int ossl_digest_is_allowed(OSSL_LIB_CTX *ctx, const EVP_MD *md)
if (ossl_securitycheck_enabled(ctx))
return ossl_digest_get_approved_nid(md) != NID_undef;
# endif /* OPENSSL_NO_FIPS_SECURITYCHECKS */
@ -299,7 +304,7 @@ index 699ada7c52..c501466cdc 100644
return 1;
}
diff --git a/providers/common/securitycheck_default.c b/providers/common/securitycheck_default.c
index de7f0d3a0a..0ba8285fbb 100644
index de7f0d3a0a..ce54a94fbc 100644
--- a/providers/common/securitycheck_default.c
+++ b/providers/common/securitycheck_default.c
@@ -15,6 +15,7 @@
@ -310,8 +315,12 @@ index de7f0d3a0a..0ba8285fbb 100644
/* Disable the security checks in the default provider */
int ossl_securitycheck_enabled(OSSL_LIB_CTX *libctx)
@@ -26,6 +27,7 @@ int ossl_digest_rsa_sign_get_md_nid(OSSL_LIB_CTX *ctx, const EVP_MD *md,
ossl_unused int sha1_allowed)
@@ -23,9 +24,10 @@ int ossl_securitycheck_enabled(OSSL_LIB_CTX *libctx)
}
int ossl_digest_rsa_sign_get_md_nid(OSSL_LIB_CTX *ctx, const EVP_MD *md,
- ossl_unused int sha1_allowed)
+ int sha1_allowed)
{
int mdnid;
+ int ldsigs_allowed;
@ -324,13 +333,76 @@ index de7f0d3a0a..0ba8285fbb 100644
- mdnid = ossl_digest_get_approved_nid_with_sha1(ctx, md, 1);
+ ldsigs_allowed = ossl_ctx_legacy_digest_signatures_allowed(ctx, 0);
+ mdnid = ossl_digest_get_approved_nid_with_sha1(ctx, md, ldsigs_allowed);
+ mdnid = ossl_digest_get_approved_nid_with_sha1(ctx, md, sha1_allowed || ldsigs_allowed);
if (mdnid == NID_undef)
mdnid = ossl_digest_md_to_nid(md, name_to_nid, OSSL_NELEM(name_to_nid));
+ if (mdnid == NID_md5_sha1 && !ldsigs_allowed)
+ mdnid = -1;
return mdnid;
}
diff --git a/providers/implementations/signature/dsa_sig.c b/providers/implementations/signature/dsa_sig.c
index 28fd7c498e..fa3822f39f 100644
--- a/providers/implementations/signature/dsa_sig.c
+++ b/providers/implementations/signature/dsa_sig.c
@@ -124,12 +124,17 @@ static int dsa_setup_md(PROV_DSA_CTX *ctx,
mdprops = ctx->propq;
if (mdname != NULL) {
- int sha1_allowed = (ctx->operation != EVP_PKEY_OP_SIGN);
WPACKET pkt;
EVP_MD *md = EVP_MD_fetch(ctx->libctx, mdname, mdprops);
- int md_nid = ossl_digest_get_approved_nid_with_sha1(ctx->libctx, md,
- sha1_allowed);
+ int md_nid;
size_t mdname_len = strlen(mdname);
+#ifdef FIPS_MODULE
+ int sha1_allowed = (ctx->operation != EVP_PKEY_OP_SIGN);
+#else
+ int sha1_allowed = 0;
+#endif
+ md_nid = ossl_digest_get_approved_nid_with_sha1(ctx->libctx, md,
+ sha1_allowed);
if (md == NULL || md_nid < 0) {
if (md == NULL)
diff --git a/providers/implementations/signature/ecdsa_sig.c b/providers/implementations/signature/ecdsa_sig.c
index 865d49d100..99b228e82c 100644
--- a/providers/implementations/signature/ecdsa_sig.c
+++ b/providers/implementations/signature/ecdsa_sig.c
@@ -237,7 +237,11 @@ static int ecdsa_setup_md(PROV_ECDSA_CTX *ctx, const char *mdname,
"%s could not be fetched", mdname);
return 0;
}
+#ifdef FIPS_MODULE
sha1_allowed = (ctx->operation != EVP_PKEY_OP_SIGN);
+#else
+ sha1_allowed = 0;
+#endif
md_nid = ossl_digest_get_approved_nid_with_sha1(ctx->libctx, md,
sha1_allowed);
if (md_nid < 0) {
diff --git a/providers/implementations/signature/rsa_sig.c b/providers/implementations/signature/rsa_sig.c
index 325e855333..c96e7e218f 100644
--- a/providers/implementations/signature/rsa_sig.c
+++ b/providers/implementations/signature/rsa_sig.c
@@ -289,10 +289,15 @@ static int rsa_setup_md(PROV_RSA_CTX *ctx, const char *mdname,
if (mdname != NULL) {
EVP_MD *md = EVP_MD_fetch(ctx->libctx, mdname, mdprops);
+ int md_nid;
+ size_t mdname_len = strlen(mdname);
+#ifdef FIPS_MODULE
int sha1_allowed = (ctx->operation != EVP_PKEY_OP_SIGN);
- int md_nid = ossl_digest_rsa_sign_get_md_nid(ctx->libctx, md,
+#else
+ int sha1_allowed = 0;
+#endif
+ md_nid = ossl_digest_rsa_sign_get_md_nid(ctx->libctx, md,
sha1_allowed);
- size_t mdname_len = strlen(mdname);
if (md == NULL
|| md_nid <= 0
diff --git a/ssl/t1_lib.c b/ssl/t1_lib.c
index fc32bb3556..4b74ee1a34 100644
--- a/ssl/t1_lib.c

6
openssl.spec
View File

@ -15,7 +15,7 @@
Summary: Utilities from the general purpose cryptography library with TLS implementation
Name: openssl
Version: 3.0.1
Release: 10%{?dist}
Release: 11%{?dist}
Epoch: 1
# We have to remove certain patented algorithms from the openssl source
# tarball with the hobble-openssl script which is included below.
@ -410,6 +410,10 @@ install -m644 %{SOURCE9} \
%ldconfig_scriptlets libs
%changelog
* Wed Feb 23 2022 Clemens Lang <cllang@redhat.com> - 1:3.0.1-11
- Allow SHA1 usage in MGF1 for RSASSA-PSS signatures
- Resolves: rhbz#2031742
* Wed Feb 23 2022 Dmitry Belyavskiy <dbelyavs@redhat.com> - 1:3.0.1-10
- rebuilt