Add a TLS test for name constraints with an EE cert without a SAN

It is valid for name constraints to be in force but for there to be no
SAN extension in a certificate. Previous versions of OpenSSL mishandled
this.

Test for CVE-2021-4044

Reviewed-by: Tomas Mraz <tomas@openssl.org>

test/certs/goodcn2-chain.pem

@@ -0,0 +1,40 @@
+-----BEGIN CERTIFICATE-----
+MIIDHTCCAgWgAwIBAgIBAjANBgkqhkiG9w0BAQsFADAXMRUwEwYDVQQDDAxUZXN0
+IE5DIENBIDEwIBcNMjExMjAyMTcyNTAyWhgPMjEyMTEyMDMxNzI1MDJaMDwxIzAh
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+fIXCvUdxQx4B1LaclUDORL5r2tRhRYdAEKtUz7RpQzJK
+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
+MIIDZjCCAk6gAwIBAgIBAjANBgkqhkiG9w0BAQsFADASMRAwDgYDVQQDDAdSb290
+IENBMCAXDTIwMTIxMjIwMTk0NFoYDzIxMjAxMjEzMjAxOTQ0WjAXMRUwEwYDVQQD
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+fyVDdLXvKf30Nlbg2hZfO/cGTmwOt7RImygzhV/s41v4wtMW0EPuVanGQusRgHFm
+3JC//UMgfkkwAA==
+-----END CERTIFICATE-----

test/ssl-tests/01-simple.cnf

@@ -1,10 +1,11 @@
 # Generated with generate_ssl_tests.pl
 
-num_tests = 3
+num_tests = 4
 
 test-0 = 0-default
 test-1 = 1-Server signature algorithms bug
 test-2 = 2-verify-cert
+test-3 = 3-name-constraints-no-san-in-ee
 # ===========================================================
 
 [0-default]
@@ -76,3 +77,26 @@ ExpectedClientAlert = UnknownCA
 ExpectedResult = ClientFail
 
 
+# ===========================================================
+
+[3-name-constraints-no-san-in-ee]
+ssl_conf = 3-name-constraints-no-san-in-ee-ssl
+
+[3-name-constraints-no-san-in-ee-ssl]
+server = 3-name-constraints-no-san-in-ee-server
+client = 3-name-constraints-no-san-in-ee-client
+
+[3-name-constraints-no-san-in-ee-server]
+Certificate = ${ENV::TEST_CERTS_DIR}/goodcn2-chain.pem
+CipherString = DEFAULT
+PrivateKey = ${ENV::TEST_CERTS_DIR}/goodcn2-key.pem
+
+[3-name-constraints-no-san-in-ee-client]
+CipherString = DEFAULT
+VerifyCAFile = ${ENV::TEST_CERTS_DIR}/root-cert.pem
+VerifyMode = Peer
+
+[test-3]
+ExpectedResult = Success
+
+

test/ssl-tests/01-simple.cnf.in

@@ -39,4 +39,16 @@ our @tests = (
           "ExpectedClientAlert" => "UnknownCA",
         },
     },
+
+    {
+        name => "name-constraints-no-san-in-ee",
+        server => {
+            "Certificate" => test_pem("goodcn2-chain.pem"),
+            "PrivateKey"  => test_pem("goodcn2-key.pem"),
+        },
+        client => {
+            "VerifyCAFile" => test_pem("root-cert.pem"),
+        },
+        test   => { "ExpectedResult" => "Success" },
+    },
 );