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net: tls: Support 256 bit keys 

Wire up support for 256 bit keys from the setsockopt to the crypto
framework

Signed-off-by: Dave Watson <davejwatson@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dave Watson 2019-01-30 21:58:05 +00:00 committed by David S. Miller
parent d3a5fd3c98
commit fb99bce712
5 changed files with 137 additions and 7 deletions
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5
include/net/tls.h
View File

@ -206,7 +206,10 @@ struct cipher_context {
union tls_crypto_context {
struct tls_crypto_info info;
struct tls12_crypto_info_aes_gcm_128 aes_gcm_128;
union {
struct tls12_crypto_info_aes_gcm_128 aes_gcm_128;
struct tls12_crypto_info_aes_gcm_256 aes_gcm_256;
};
};
struct tls_context {

15
include/uapi/linux/tls.h
View File

@ -59,6 +59,13 @@
#define TLS_CIPHER_AES_GCM_128_TAG_SIZE 16
#define TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE 8
#define TLS_CIPHER_AES_GCM_256 52
#define TLS_CIPHER_AES_GCM_256_IV_SIZE 8
#define TLS_CIPHER_AES_GCM_256_KEY_SIZE 32
#define TLS_CIPHER_AES_GCM_256_SALT_SIZE 4
#define TLS_CIPHER_AES_GCM_256_TAG_SIZE 16
#define TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE 8
#define TLS_SET_RECORD_TYPE 1
#define TLS_GET_RECORD_TYPE 2
@ -75,4 +82,12 @@ struct tls12_crypto_info_aes_gcm_128 {
unsigned char rec_seq[TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE];
};
struct tls12_crypto_info_aes_gcm_256 {
struct tls_crypto_info info;
unsigned char iv[TLS_CIPHER_AES_GCM_256_IV_SIZE];
unsigned char key[TLS_CIPHER_AES_GCM_256_KEY_SIZE];
unsigned char salt[TLS_CIPHER_AES_GCM_256_SALT_SIZE];
unsigned char rec_seq[TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE];
};
#endif /* _UAPI_LINUX_TLS_H */

33
net/tls/tls_main.c
View File

@ -372,6 +372,30 @@ static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval,
rc = -EFAULT;
break;
}
case TLS_CIPHER_AES_GCM_256: {
struct tls12_crypto_info_aes_gcm_256 *
crypto_info_aes_gcm_256 =
container_of(crypto_info,
struct tls12_crypto_info_aes_gcm_256,
info);
if (len != sizeof(*crypto_info_aes_gcm_256)) {
rc = -EINVAL;
goto out;
}
lock_sock(sk);
memcpy(crypto_info_aes_gcm_256->iv,
ctx->tx.iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE,
TLS_CIPHER_AES_GCM_256_IV_SIZE);
memcpy(crypto_info_aes_gcm_256->rec_seq, ctx->tx.rec_seq,
TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
release_sock(sk);
if (copy_to_user(optval,
crypto_info_aes_gcm_256,
sizeof(*crypto_info_aes_gcm_256)))
rc = -EFAULT;
break;
}
default:
rc = -EINVAL;
}
@ -412,6 +436,7 @@ static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
{
struct tls_crypto_info *crypto_info;
struct tls_context *ctx = tls_get_ctx(sk);
size_t optsize;
int rc = 0;
int conf;
@ -444,8 +469,12 @@ static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
}
switch (crypto_info->cipher_type) {
case TLS_CIPHER_AES_GCM_128: {
if (optlen != sizeof(struct tls12_crypto_info_aes_gcm_128)) {
case TLS_CIPHER_AES_GCM_128:
case TLS_CIPHER_AES_GCM_256: {
optsize = crypto_info->cipher_type == TLS_CIPHER_AES_GCM_128 ?
sizeof(struct tls12_crypto_info_aes_gcm_128) :
sizeof(struct tls12_crypto_info_aes_gcm_256);
if (optlen != optsize) {
rc = -EINVAL;
goto err_crypto_info;
}

29
net/tls/tls_sw.c
View File

@ -1999,6 +1999,7 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
{
struct tls_crypto_info *crypto_info;
struct tls12_crypto_info_aes_gcm_128 *gcm_128_info;
struct tls12_crypto_info_aes_gcm_256 *gcm_256_info;
struct tls_sw_context_tx *sw_ctx_tx = NULL;
struct tls_sw_context_rx *sw_ctx_rx = NULL;
struct cipher_context *cctx;
@ -2006,7 +2007,8 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
struct strp_callbacks cb;
u16 nonce_size, tag_size, iv_size, rec_seq_size;
struct crypto_tfm *tfm;
char *iv, *rec_seq;
char *iv, *rec_seq, *key, *salt;
size_t keysize;
int rc = 0;
if (!ctx) {
@ -2067,6 +2069,24 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq;
gcm_128_info =
(struct tls12_crypto_info_aes_gcm_128 *)crypto_info;
keysize = TLS_CIPHER_AES_GCM_128_KEY_SIZE;
key = gcm_128_info->key;
salt = gcm_128_info->salt;
break;
}
case TLS_CIPHER_AES_GCM_256: {
nonce_size = TLS_CIPHER_AES_GCM_256_IV_SIZE;
tag_size = TLS_CIPHER_AES_GCM_256_TAG_SIZE;
iv_size = TLS_CIPHER_AES_GCM_256_IV_SIZE;
iv = ((struct tls12_crypto_info_aes_gcm_256 *)crypto_info)->iv;
rec_seq_size = TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE;
rec_seq =
((struct tls12_crypto_info_aes_gcm_256 *)crypto_info)->rec_seq;
gcm_256_info =
(struct tls12_crypto_info_aes_gcm_256 *)crypto_info;
keysize = TLS_CIPHER_AES_GCM_256_KEY_SIZE;
key = gcm_256_info->key;
salt = gcm_256_info->salt;
break;
}
default:
@ -2090,7 +2110,8 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
rc = -ENOMEM;
goto free_priv;
}
memcpy(cctx->iv, gcm_128_info->salt, TLS_CIPHER_AES_GCM_128_SALT_SIZE);
/* Note: 128 & 256 bit salt are the same size */
memcpy(cctx->iv, salt, TLS_CIPHER_AES_GCM_128_SALT_SIZE);
memcpy(cctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size);
cctx->rec_seq_size = rec_seq_size;
cctx->rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL);
@ -2110,8 +2131,8 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
ctx->push_pending_record = tls_sw_push_pending_record;
rc = crypto_aead_setkey(*aead, gcm_128_info->key,
TLS_CIPHER_AES_GCM_128_KEY_SIZE);
rc = crypto_aead_setkey(*aead, key, keysize);
if (rc)
goto free_aead;

62
tools/testing/selftests/net/tls.c
View File

@ -763,4 +763,66 @@ TEST_F(tls, control_msg)
EXPECT_EQ(memcmp(buf, test_str, send_len), 0);
}
TEST(keysizes) {
struct tls12_crypto_info_aes_gcm_256 tls12;
struct sockaddr_in addr;
int sfd, ret, fd, cfd;
socklen_t len;
bool notls;
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_256;
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));
EXPECT_EQ(ret, 0);
}
cfd = accept(sfd, &addr, &len);
ASSERT_GE(cfd, 0);
if (!notls) {
ret = setsockopt(cfd, IPPROTO_TCP, TCP_ULP, "tls",
sizeof("tls"));
EXPECT_EQ(ret, 0);
ret = setsockopt(cfd, SOL_TLS, TLS_RX, &tls12,
sizeof(tls12));
EXPECT_EQ(ret, 0);
}
close(sfd);
close(fd);
close(cfd);
}
TEST_HARNESS_MAIN