Add tests for deprecated sigalgs with TLS 1.3 ClientHellos

Test for each of DSA, SHA1, and SHA224.

Use the symbolic names for SignatureScheme comparisons just added.
Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3326)

test/recipes/70-test_sslsigalgs.t

@@ -39,7 +39,9 @@ use constant {
     EMPTY_SIG_ALGS_EXT => 1,
     NO_KNOWN_SIG_ALGS => 2,
     NO_PSS_SIG_ALGS => 3,
-    PSS_ONLY_SIG_ALGS => 4
+    PSS_ONLY_SIG_ALGS => 4,
+    PURE_SIGALGS => 5,
+    COMPAT_SIGALGS => 6
 };
 
 #Note: Throughout this test we override the default ciphersuites where TLSv1.2
@@ -48,7 +50,7 @@ use constant {
 
 #Test 1: Default sig algs should succeed
 $proxy->start() or plan skip_all => "Unable to start up Proxy for tests";
-plan tests => 16;
+plan tests => 18;
 ok(TLSProxy::Message->success, "Default sigalgs");
 my $testtype;
 
@@ -197,6 +199,29 @@ SKIP: {
     ok(TLSProxy::Message->success, "No TLSv1.2 sigalgs, ECDSA");
 }
 
+my ($dsa_status, $sha1_status, $sha224_status);
+SKIP: {
+    skip "TLSv1.3 disabled", 2 if disabled("tls1_3") || disabled("dsa");
+    #Test 17: signature_algorithms with 1.3-only ClientHello
+    $testtype = PURE_SIGALGS;
+    $dsa_status = $sha1_status = $sha224_status = 0;
+    $proxy->clear();
+    $proxy->clientflags("-tls1_3");
+    $proxy->filter(\&modify_sigalgs_filter);
+    $proxy->start();
+    ok($dsa_status && $sha1_status && $sha224_status,
+       "DSA/SHA2 sigalg sent for 1.3-only ClientHello");
+
+    #Test 18: signature_algorithms with backwards compatible ClientHello
+    $testtype = COMPAT_SIGALGS;
+    $dsa_status = $sha1_status = $sha224_status = 0;
+    $proxy->clear();
+    $proxy->filter(\&modify_sigalgs_filter);
+    $proxy->start();
+    ok($dsa_status && $sha1_status && $sha224_status,
+       "DSA sigalg not sent for compat ClientHello");
+}
+
 
 
 sub sigalgs_filter
@@ -232,3 +257,60 @@ sub sigalgs_filter
         }
     }
 }
+
+sub modify_sigalgs_filter
+{
+    my $proxy = shift;
+
+    # We're only interested in the initial ClientHello
+    return if ($proxy->flight != 0);
+
+    foreach my $message (@{$proxy->message_list}) {
+        my $ext;
+        my @algs;
+
+        if ($message->mt == TLSProxy::Message::MT_CLIENT_HELLO) {
+            if ($testtype == PURE_SIGALGS) {
+                my $ok = 1;
+                $ext = $message->extension_data->{TLSProxy::Message::EXT_SIG_ALGS};
+                @algs = unpack('S>*', $ext);
+                # unpack will unpack the length as well
+                shift @algs;
+                foreach (@algs) {
+                    if ($_ == TLSProxy::Message::SIG_ALG_DSA_SHA256
+                        || $_ == TLSProxy::Message::SIG_ALG_DSA_SHA384
+                        || $_ == TLSProxy::Message::SIG_ALG_DSA_SHA512
+                        || $_ == TLSProxy::Message::OSSL_SIG_ALG_DSA_SHA224
+                        || $_ == TLSProxy::Message::SIG_ALG_RSA_PKCS1_SHA1
+                        || $_ == TLSProxy::Message::SIG_ALG_DSA_SHA1
+                        || $_ == TLSProxy::Message::SIG_ALG_ECDSA_SHA1) {
+                        $ok = 0;
+                    }
+                }
+                $sha1_status = $dsa_status = $sha224_status = 1 if ($ok);
+            } elsif ($testtype == COMPAT_SIGALGS) {
+                $ext = $message->extension_data->{TLSProxy::Message::EXT_SIG_ALGS};
+                @algs = unpack('S>*', $ext);
+                # unpack will unpack the length as well
+                shift @algs;
+                foreach (@algs) {
+                    if ($_ == TLSProxy::Message::SIG_ALG_DSA_SHA256
+                        || $_ == TLSProxy::Message::SIG_ALG_DSA_SHA384
+                        || $_ == TLSProxy::Message::SIG_ALG_DSA_SHA512) {
+                        $dsa_status = 1;
+                    }
+                    if ($_ == TLSProxy::Message::SIG_ALG_RSA_PKCS1_SHA1
+                        || $_ == TLSProxy::Message::SIG_ALG_DSA_SHA1
+                        || $_ == TLSProxy::Message::SIG_ALG_ECDSA_SHA1) {
+                        $sha1_status = 1;
+                    }
+                    if ($_ == TLSProxy::Message::OSSL_SIG_ALG_RSA_PKCS1_SHA224
+                        || $_ == TLSProxy::Message::OSSL_SIG_ALG_DSA_SHA224
+                        || $_ == TLSProxy::Message::OSSL_SIG_ALG_ECDSA_SHA224) {
+                        $sha224_status = 1;
+                    }
+                }
+            }
+        }
+    }
+}