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authorDave Watson <davejwatson@fb.com>2019-01-30 21:58:05 +0000
committerDavid S. Miller <davem@davemloft.net>2019-02-01 15:00:55 -0800
commitfb99bce7120014307dde57b3d7def6977a9a62a1 (patch)
tree675e706950fa83542e60630c08a1eee8c91400ad /net/tls
parentd3a5fd3c987c5e341bf78b79ef4d81080081b7d2 (diff)
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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>
Diffstat (limited to 'net/tls')
-rw-r--r--net/tls/tls_main.c33
-rw-r--r--net/tls/tls_sw.c29
2 files changed, 56 insertions, 6 deletions
diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index d36d095cbcf0..0f028cfdf835 100644
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -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;
}
diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index 3f2a6af27e62..9326c06c2ffe 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -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;