linux-kernel - Re: [PATCH 5/5] selftests: tls: run all tests for TLS 1.2 and TLS 1.3

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Date:   Fri, 13 Mar 2020 16:26:43 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     shuah@...nel.org, luto@...capital.net, wad@...omium.org,
        linux-kselftest@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH 5/5] selftests: tls: run all tests for TLS 1.2 and TLS 1.3

On Thu, Mar 12, 2020 at 08:17:52PM -0700, Jakub Kicinski wrote:
> TLS 1.2 and TLS 1.3 differ in the implementation.
> Use fixture parameters to run all tests for both
> versions, and remove the one-off TLS 1.2 test.
> 
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>

I really like the resulting effect here.

Reviewed-by: Kees Cook <keescook@...omium.org>

-Kees

> ---
>  tools/testing/selftests/net/tls.c | 93 ++++++-------------------------
>  1 file changed, 17 insertions(+), 76 deletions(-)
> 
> diff --git a/tools/testing/selftests/net/tls.c b/tools/testing/selftests/net/tls.c
> index 0ea44d975b6c..63029728ac97 100644
> --- a/tools/testing/selftests/net/tls.c
> +++ b/tools/testing/selftests/net/tls.c
> @@ -101,6 +101,21 @@ FIXTURE(tls)
>  	bool notls;
>  };
>  
> +FIXTURE_PARAMS(tls)
> +{
> +	unsigned int tls_version;
> +};
> +
> +FIXTURE_PARAMS_ADD(tls, 12)
> +{
> +	.tls_version = TLS_1_2_VERSION,
> +};
> +
> +FIXTURE_PARAMS_ADD(tls, 13)
> +{
> +	.tls_version = TLS_1_3_VERSION,
> +};
> +
>  FIXTURE_SETUP(tls)
>  {
>  	struct tls12_crypto_info_aes_gcm_128 tls12;
> @@ -112,7 +127,7 @@ FIXTURE_SETUP(tls)
>  	len = sizeof(addr);
>  
>  	memset(&tls12, 0, sizeof(tls12));
> -	tls12.info.version = TLS_1_3_VERSION;
> +	tls12.info.version = params->tls_version;
>  	tls12.info.cipher_type = TLS_CIPHER_AES_GCM_128;
>  
>  	addr.sin_family = AF_INET;
> @@ -733,7 +748,7 @@ TEST_F(tls, bidir)
>  		struct tls12_crypto_info_aes_gcm_128 tls12;
>  
>  		memset(&tls12, 0, sizeof(tls12));
> -		tls12.info.version = TLS_1_3_VERSION;
> +		tls12.info.version = params->tls_version;
>  		tls12.info.cipher_type = TLS_CIPHER_AES_GCM_128;
>  
>  		ret = setsockopt(self->fd, SOL_TLS, TLS_RX, &tls12,
> @@ -1258,78 +1273,4 @@ TEST(keysizes) {
>  	close(cfd);
>  }
>  
> -TEST(tls12) {
> -	int fd, cfd;
> -	bool notls;
> -
> -	struct tls12_crypto_info_aes_gcm_128 tls12;
> -	struct sockaddr_in addr;
> -	socklen_t len;
> -	int sfd, ret;
> -
> -	notls = false;
> -	len = sizeof(addr);
> -
> -	memset(&tls12, 0, sizeof(tls12));
> -	tls12.info.version = TLS_1_2_VERSION;
> -	tls12.info.cipher_type = TLS_CIPHER_AES_GCM_128;
> -
> -	addr.sin_family = AF_INET;
> -	addr.sin_addr.s_addr = htonl(INADDR_ANY);
> -	addr.sin_port = 0;
> -
> -	fd = socket(AF_INET, SOCK_STREAM, 0);
> -	sfd = socket(AF_INET, SOCK_STREAM, 0);
> -
> -	ret = bind(sfd, &addr, sizeof(addr));
> -	ASSERT_EQ(ret, 0);
> -	ret = listen(sfd, 10);
> -	ASSERT_EQ(ret, 0);
> -
> -	ret = getsockname(sfd, &addr, &len);
> -	ASSERT_EQ(ret, 0);
> -
> -	ret = connect(fd, &addr, sizeof(addr));
> -	ASSERT_EQ(ret, 0);
> -
> -	ret = setsockopt(fd, IPPROTO_TCP, TCP_ULP, "tls", sizeof("tls"));
> -	if (ret != 0) {
> -		notls = true;
> -		printf("Failure setting TCP_ULP, testing without tls\n");
> -	}
> -
> -	if (!notls) {
> -		ret = setsockopt(fd, SOL_TLS, TLS_TX, &tls12,
> -				 sizeof(tls12));
> -		ASSERT_EQ(ret, 0);
> -	}
> -
> -	cfd = accept(sfd, &addr, &len);
> -	ASSERT_GE(cfd, 0);
> -
> -	if (!notls) {
> -		ret = setsockopt(cfd, IPPROTO_TCP, TCP_ULP, "tls",
> -				 sizeof("tls"));
> -		ASSERT_EQ(ret, 0);
> -
> -		ret = setsockopt(cfd, SOL_TLS, TLS_RX, &tls12,
> -				 sizeof(tls12));
> -		ASSERT_EQ(ret, 0);
> -	}
> -
> -	close(sfd);
> -
> -	char const *test_str = "test_read";
> -	int send_len = 10;
> -	char buf[10];
> -
> -	send_len = strlen(test_str) + 1;
> -	EXPECT_EQ(send(fd, test_str, send_len, 0), send_len);
> -	EXPECT_NE(recv(cfd, buf, send_len, 0), -1);
> -	EXPECT_EQ(memcmp(buf, test_str, send_len), 0);
> -
> -	close(fd);
> -	close(cfd);
> -}
> -
>  TEST_HARNESS_MAIN
> -- 
> 2.24.1
> 

-- 
Kees Cook