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openssl/openssl-1.1.1-seclevel.patch
Tomas Mraz ef93cf994d SHA1 is allowed in @SECLEVEL=2 only if allowed by TLS SigAlgs configuration 
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
2020-06-05 17:39:16 +02:00

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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 };
+static const int minbits_digest_table[] = { 80, 80, 128, 192, 256 };
static const int NUM_AUTH_LEVELS = OSSL_NELEM(minbits_table);
/*
@@ -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 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-1.1.1g/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>
-Security level set to 112 bits of security. As a result RSA, DSA and DH keys
-shorter than 2048 bits and ECC keys shorter than 224 bits are prohibited.
+Security level set to 112 bits of security with the exception of SHA1 allowed
+for signatures.
+As a result RSA, DSA and DH keys shorter than 2048 bits and ECC keys
+shorter than 224 bits are prohibited.
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-1.1.1g/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 && !sha1_disable(s, ctx))
+ break;
if (bits < minbits)
return 0;
}
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");
-ok(!verify("ee-pss-sha1-cert", "sslserver", ["root-cert"], ["ca-cert"], "-auth_level", "2"),
- "Reject PSS signature using SHA1 and auth level 2");
+ok(!verify("ee-pss-sha1-cert", "sslserver", ["root-cert"], ["ca-cert"], "-auth_level", "3"),
+ "Reject PSS signature using SHA1 and auth level 3");
ok(verify("ee-pss-sha256-cert", "sslserver", ["root-cert"], ["ca-cert"], "-auth_level", "2"),
"PSS signature using SHA256 and auth level 2");
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