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SHA1 is allowed in @SECLEVEL=2 only if allowed by TLS SigAlgs configuration

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Also some small TLS protocol fixes/changes:

Disallow dropping Extended Master Secret extension on renegotiation
Return alert from s_server if ALPN protocol does not match
This commit is contained in:
Tomas Mraz 2020-06-05 17:39:16 +02:00
parent b9c80ecf85
commit ef93cf994d
4 changed files with 197 additions and 20 deletions
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27
openssl-1.1.1-alpn-cb.patch Normal file
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@ -0,0 +1,27 @@
commit 9e885a707d604e9528b5491b78fb9c00f41193fc
Author: Tomas Mraz <tmraz@fedoraproject.org>
Date: Thu Mar 26 15:59:00 2020 +0100
s_server: Properly indicate ALPN protocol mismatch
Return SSL_TLSEXT_ERR_ALERT_FATAL from alpn_select_cb so that
an alert is sent to the client on ALPN protocol mismatch.
Fixes: #2708
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11415)
diff --git a/apps/s_server.c b/apps/s_server.c
index bcc83e562c..591c6c19c5 100644
--- a/apps/s_server.c
+++ b/apps/s_server.c
@@ -707,7 +707,7 @@ static int alpn_cb(SSL *s, const unsigned char **out, unsigned char *outlen,
if (SSL_select_next_proto
((unsigned char **)out, outlen, alpn_ctx->data, alpn_ctx->len, in,
inlen) != OPENSSL_NPN_NEGOTIATED) {
- return SSL_TLSEXT_ERR_NOACK;
+ return SSL_TLSEXT_ERR_ALERT_FATAL;
}
if (!s_quiet) {

44
openssl-1.1.1-reneg-no-extms.patch Normal file
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@ -0,0 +1,44 @@
diff -up openssl-1.1.1g/include/openssl/ssl3.h.reneg-no-extms openssl-1.1.1g/include/openssl/ssl3.h
--- openssl-1.1.1g/include/openssl/ssl3.h.reneg-no-extms 2020-04-21 14:22:39.000000000 +0200
+++ openssl-1.1.1g/include/openssl/ssl3.h 2020-06-05 15:20:22.090682776 +0200
@@ -292,6 +292,9 @@ extern "C" {
# define TLS1_FLAGS_STATELESS 0x0800
+/* Set if extended master secret extension required on renegotiation */
+# define TLS1_FLAGS_REQUIRED_EXTMS 0x1000
+
# define SSL3_MT_HELLO_REQUEST 0
# define SSL3_MT_CLIENT_HELLO 1
# define SSL3_MT_SERVER_HELLO 2
diff -up openssl-1.1.1g/ssl/statem/extensions.c.reneg-no-extms openssl-1.1.1g/ssl/statem/extensions.c
--- openssl-1.1.1g/ssl/statem/extensions.c.reneg-no-extms 2020-04-21 14:22:39.000000000 +0200
+++ openssl-1.1.1g/ssl/statem/extensions.c 2020-06-05 15:22:19.677653437 +0200
@@ -1168,14 +1168,26 @@ static int init_etm(SSL *s, unsigned int
static int init_ems(SSL *s, unsigned int context)
{
- if (!s->server)
+ if (s->s3->flags & TLS1_FLAGS_RECEIVED_EXTMS) {
s->s3->flags &= ~TLS1_FLAGS_RECEIVED_EXTMS;
+ s->s3->flags |= TLS1_FLAGS_REQUIRED_EXTMS;
+ }
return 1;
}
static int final_ems(SSL *s, unsigned int context, int sent)
{
+ /*
+ * Check extended master secret extension is not dropped on
+ * renegotiation.
+ */
+ if (!(s->s3->flags & TLS1_FLAGS_RECEIVED_EXTMS)
+ && (s->s3->flags & TLS1_FLAGS_REQUIRED_EXTMS)) {
+ SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_FINAL_EMS,
+ SSL_R_INCONSISTENT_EXTMS);
+ return 0;
+ }
if (!s->server && s->hit) {
/*
* Check extended master secret extension is consistent with

133
openssl-1.1.1-seclevel.patch
View File

@ -1,7 +1,7 @@
diff -up openssl-1.1.1/crypto/x509/x509_vfy.c.seclevel openssl-1.1.1/crypto/x509/x509_vfy.c
--- openssl-1.1.1/crypto/x509/x509_vfy.c.seclevel 2018-09-11 14:48:22.000000000 +0200
+++ openssl-1.1.1/crypto/x509/x509_vfy.c 2018-10-01 09:52:23.535298908 +0200
@@ -3220,6 +3220,7 @@ static int build_chain(X509_STORE_CTX *c
diff -up openssl-1.1.1g/crypto/x509/x509_vfy.c.seclevel openssl-1.1.1g/crypto/x509/x509_vfy.c
--- openssl-1.1.1g/crypto/x509/x509_vfy.c.seclevel 2020-04-21 14:22:39.000000000 +0200
+++ openssl-1.1.1g/crypto/x509/x509_vfy.c 2020-06-05 17:16:54.835536823 +0200
@@ -3225,6 +3225,7 @@ static int build_chain(X509_STORE_CTX *c
}
static const int minbits_table[] = { 80, 112, 128, 192, 256 };
@ -9,20 +9,23 @@ diff -up openssl-1.1.1/crypto/x509/x509_vfy.c.seclevel openssl-1.1.1/crypto/x509
static const int NUM_AUTH_LEVELS = OSSL_NELEM(minbits_table);
/*
@@ -3264,6 +3265,8 @@ static int check_sig_level(X509_STORE_CT
@@ -3276,6 +3277,11 @@ static int check_sig_level(X509_STORE_CT
if (!X509_get_signature_info(cert, NULL, NULL, &secbits, NULL))
return 0;
-
- return secbits >= minbits_table[level - 1];
+ /* Allow SHA1 in SECLEVEL 2 in non-FIPS mode */
+ if (FIPS_mode())
+ /*
+ * Allow SHA1 in SECLEVEL 2 in non-FIPS mode or when the magic
+ * disable SHA1 flag is not set.
+ */
+ if ((ctx->param->flags & 0x40000000) || FIPS_mode())
+ return secbits >= minbits_table[level - 1];
+ return secbits >= minbits_digest_table[level - 1];
}
diff -up openssl-1.1.1/doc/man3/SSL_CTX_set_security_level.pod.seclevel openssl-1.1.1/doc/man3/SSL_CTX_set_security_level.pod
--- openssl-1.1.1/doc/man3/SSL_CTX_set_security_level.pod.seclevel 2018-09-11 14:48:22.000000000 +0200
+++ openssl-1.1.1/doc/man3/SSL_CTX_set_security_level.pod 2018-10-01 09:52:23.535298908 +0200
diff -up openssl-1.1.1g/doc/man3/SSL_CTX_set_security_level.pod.seclevel openssl-1.1.1g/doc/man3/SSL_CTX_set_security_level.pod
--- openssl-1.1.1g/doc/man3/SSL_CTX_set_security_level.pod.seclevel 2020-04-21 14:22:39.000000000 +0200
+++ openssl-1.1.1g/doc/man3/SSL_CTX_set_security_level.pod 2020-06-04 15:48:01.608178833 +0200
@@ -81,8 +81,10 @@ using MD5 for the MAC is also prohibited
=item B<Level 2>
@ -36,23 +39,115 @@ diff -up openssl-1.1.1/doc/man3/SSL_CTX_set_security_level.pod.seclevel openssl-
In addition to the level 1 exclusions any cipher suite using RC4 is also
prohibited. SSL version 3 is also not allowed. Compression is disabled.
diff -up openssl-1.1.1/ssl/ssl_cert.c.seclevel openssl-1.1.1/ssl/ssl_cert.c
--- openssl-1.1.1/ssl/ssl_cert.c.seclevel 2018-09-11 14:48:23.000000000 +0200
+++ openssl-1.1.1/ssl/ssl_cert.c 2018-10-12 15:29:12.673799305 +0200
@@ -983,6 +983,9 @@ static int ssl_security_default_callback
diff -up openssl-1.1.1g/ssl/ssl_cert.c.seclevel openssl-1.1.1g/ssl/ssl_cert.c
--- openssl-1.1.1g/ssl/ssl_cert.c.seclevel 2020-04-21 14:22:39.000000000 +0200
+++ openssl-1.1.1g/ssl/ssl_cert.c 2020-06-05 17:10:11.842198401 +0200
@@ -27,6 +27,7 @@
static int ssl_security_default_callback(const SSL *s, const SSL_CTX *ctx,
int op, int bits, int nid, void *other,
void *ex);
+static unsigned long sha1_disable(const SSL *s, const SSL_CTX *ctx);
static CRYPTO_ONCE ssl_x509_store_ctx_once = CRYPTO_ONCE_STATIC_INIT;
static volatile int ssl_x509_store_ctx_idx = -1;
@@ -396,7 +397,7 @@ int ssl_verify_cert_chain(SSL *s, STACK_
X509_VERIFY_PARAM_set_auth_level(param, SSL_get_security_level(s));
/* Set suite B flags if needed */
- X509_STORE_CTX_set_flags(ctx, tls1_suiteb(s));
+ X509_STORE_CTX_set_flags(ctx, tls1_suiteb(s) | sha1_disable(s, NULL));
if (!X509_STORE_CTX_set_ex_data
(ctx, SSL_get_ex_data_X509_STORE_CTX_idx(), s)) {
goto end;
@@ -953,12 +954,33 @@ static int ssl_security_default_callback
return 0;
break;
default:
+ /* allow SHA1 in SECLEVEL 2 in non FIPS mode */
+ if (nid == NID_sha1 && minbits == 112 && !FIPS_mode())
+ if (nid == NID_sha1 && minbits == 112 && !sha1_disable(s, ctx))
+ break;
if (bits < minbits)
return 0;
}
diff -up openssl-1.1.1/test/recipes/25-test_verify.t.seclevel openssl-1.1.1/test/recipes/25-test_verify.t
--- openssl-1.1.1/test/recipes/25-test_verify.t.seclevel 2018-09-11 14:48:24.000000000 +0200
+++ openssl-1.1.1/test/recipes/25-test_verify.t 2018-10-01 09:52:23.535298908 +0200
@@ -342,8 +342,8 @@ ok(verify("ee-pss-sha1-cert", "sslserver
return 1;
}
+static unsigned long sha1_disable(const SSL *s, const SSL_CTX *ctx)
+{
+ unsigned long ret = 0x40000000; /* a magical internal value used by X509_VERIFY_PARAM */
+ const CERT *c;
+
+ if (FIPS_mode())
+ return ret;
+
+ if (ctx != NULL) {
+ c = ctx->cert;
+ } else {
+ c = s->cert;
+ }
+ if (tls1_cert_sigalgs_have_sha1(c))
+ return 0;
+ return ret;
+}
+
int ssl_security(const SSL *s, int op, int bits, int nid, void *other)
{
return s->cert->sec_cb(s, NULL, op, bits, nid, other, s->cert->sec_ex);
diff -up openssl-1.1.1g/ssl/ssl_local.h.seclevel openssl-1.1.1g/ssl/ssl_local.h
--- openssl-1.1.1g/ssl/ssl_local.h.seclevel 2020-06-04 15:48:01.602178783 +0200
+++ openssl-1.1.1g/ssl/ssl_local.h 2020-06-05 17:02:22.666313410 +0200
@@ -2576,6 +2576,7 @@ __owur int tls1_save_sigalgs(SSL *s, PAC
__owur int tls1_process_sigalgs(SSL *s);
__owur int tls1_set_peer_legacy_sigalg(SSL *s, const EVP_PKEY *pkey);
__owur int tls1_lookup_md(const SIGALG_LOOKUP *lu, const EVP_MD **pmd);
+int tls1_cert_sigalgs_have_sha1(const CERT *c);
__owur size_t tls12_get_psigalgs(SSL *s, int sent, const uint16_t **psigs);
# ifndef OPENSSL_NO_EC
__owur int tls_check_sigalg_curve(const SSL *s, int curve);
diff -up openssl-1.1.1g/ssl/t1_lib.c.seclevel openssl-1.1.1g/ssl/t1_lib.c
--- openssl-1.1.1g/ssl/t1_lib.c.seclevel 2020-06-04 15:48:01.654179221 +0200
+++ openssl-1.1.1g/ssl/t1_lib.c 2020-06-05 17:02:40.268459157 +0200
@@ -2145,6 +2145,36 @@ int tls1_set_sigalgs(CERT *c, const int
return 0;
}
+static int tls1_sigalgs_have_sha1(const uint16_t *sigalgs, size_t sigalgslen)
+{
+ size_t i;
+
+ for (i = 0; i < sigalgslen; i++, sigalgs++) {
+ const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(*sigalgs);
+
+ if (lu == NULL)
+ continue;
+ if (lu->hash == NID_sha1)
+ return 1;
+ }
+ return 0;
+}
+
+
+int tls1_cert_sigalgs_have_sha1(const CERT *c)
+{
+ if (c->client_sigalgs != NULL) {
+ if (tls1_sigalgs_have_sha1(c->client_sigalgs, c->client_sigalgslen))
+ return 1;
+ }
+ if (c->conf_sigalgs != NULL) {
+ if (tls1_sigalgs_have_sha1(c->conf_sigalgs, c->conf_sigalgslen))
+ return 1;
+ return 0;
+ }
+ return 1;
+}
+
static int tls1_check_sig_alg(SSL *s, X509 *x, int default_nid)
{
int sig_nid, use_pc_sigalgs = 0;
diff -up openssl-1.1.1g/test/recipes/25-test_verify.t.seclevel openssl-1.1.1g/test/recipes/25-test_verify.t
--- openssl-1.1.1g/test/recipes/25-test_verify.t.seclevel 2020-04-21 14:22:39.000000000 +0200
+++ openssl-1.1.1g/test/recipes/25-test_verify.t 2020-06-04 15:48:01.608178833 +0200
@@ -346,8 +346,8 @@ ok(verify("ee-pss-sha1-cert", "sslserver
ok(verify("ee-pss-sha256-cert", "sslserver", ["root-cert"], ["ca-cert"], ),
"CA with PSS signature using SHA256");

13
openssl.spec
View File

@ -22,7 +22,7 @@
Summary: Utilities from the general purpose cryptography library with TLS implementation
Name: openssl
Version: 1.1.1g
Release: 8%{?dist}
Release: 9%{?dist}
Epoch: 1
# We have to remove certain patented algorithms from the openssl source
# tarball with the hobble-openssl script which is included below.
@ -69,6 +69,8 @@ Patch62: openssl-1.1.1-fips-curves.patch
Patch65: openssl-1.1.1-fips-drbg-selftest.patch
Patch66: openssl-1.1.1-fips-dh.patch
Patch67: openssl-1.1.1-kdf-selftest.patch
Patch68: openssl-1.1.1-reneg-no-extms.patch
Patch69: openssl-1.1.1-alpn-cb.patch
# Backported fixes including security fixes
Patch52: openssl-1.1.1-s390x-update.patch
Patch53: openssl-1.1.1-fips-crng-test.patch
@ -183,6 +185,8 @@ cp %{SOURCE13} test/
%patch65 -p1 -b .drbg-selftest
%patch66 -p1 -b .fips-dh
%patch67 -p1 -b .kdf-selftest
%patch68 -p1 -b .reneg-no-extms
%patch69 -p1 -b .alpn-cb
%build
@ -469,6 +473,13 @@ export LD_LIBRARY_PATH
%ldconfig_scriptlets libs
%changelog
* Fri Jun 5 2020 Tomáš Mráz <tmraz@redhat.com> 1.1.1g-9
- Disallow dropping Extended Master Secret extension
on renegotiation
- Return alert from s_server if ALPN protocol does not match
- SHA1 is allowed in @SECLEVEL=2 only if allowed by
TLS SigAlgs configuration
* Wed Jun 3 2020 Tomáš Mráz <tmraz@redhat.com> 1.1.1g-8
- Add FIPS selftest for PBKDF2 and KBKDF