net/tls: Add support of AES128-CCM based ciphers

Added support for AES128-CCM based record encryption. AES128-CCM is
similar to AES128-GCM. Both of them have same salt/iv/mac size. The
notable difference between the two is that while invoking AES128-CCM
operation, the salt||nonce (which is passed as IV) has to be prefixed
with a hardcoded value '2'. Further, CCM implementation in kernel
requires IV passed in crypto_aead_request() to be full '16' bytes.
Therefore, the record structure 'struct tls_rec' has been modified to
reserve '16' bytes for IV. This works for both GCM and CCM based cipher.

Signed-off-by: Vakul Garg <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: nxa22042

include/net/tls.h

@@ -60,6 +60,17 @@
 #define TLS_AAD_SPACE_SIZE		13
 #define TLS_DEVICE_NAME_MAX		32
 
+#define MAX_IV_SIZE			16
+
+/* For AES-CCM, the full 16-bytes of IV is made of '4' fields of given sizes.
+ *
+ * IV[16] = b0[1] || implicit nonce[4] || explicit nonce[8] || length[3]
+ *
+ * The field 'length' is encoded in field 'b0' as '(length width - 1)'.
+ * Hence b0 contains (3 - 1) = 2.
+ */
+#define TLS_AES_CCM_IV_B0_BYTE		2
+
 /*
  * This structure defines the routines for Inline TLS driver.
  * The following routines are optional and filled with a
@@ -123,8 +134,7 @@ struct tls_rec {
 	struct scatterlist sg_content_type;
 
 	char aad_space[TLS_AAD_SPACE_SIZE];
-	u8 iv_data[TLS_CIPHER_AES_GCM_128_IV_SIZE +
-		   TLS_CIPHER_AES_GCM_128_SALT_SIZE];
+	u8 iv_data[MAX_IV_SIZE];
 	struct aead_request aead_req;
 	u8 aead_req_ctx[];
 };
@@ -219,6 +229,7 @@ struct tls_prot_info {
 	u16 tag_size;
 	u16 overhead_size;
 	u16 iv_size;
+	u16 salt_size;
 	u16 rec_seq_size;
 	u16 aad_size;
 	u16 tail_size;

include/uapi/linux/tls.h

@@ -70,6 +70,13 @@
 #define TLS_CIPHER_AES_GCM_256_TAG_SIZE		16
 #define TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE		8
 
+#define TLS_CIPHER_AES_CCM_128				53
+#define TLS_CIPHER_AES_CCM_128_IV_SIZE			8
+#define TLS_CIPHER_AES_CCM_128_KEY_SIZE		16
+#define TLS_CIPHER_AES_CCM_128_SALT_SIZE		4
+#define TLS_CIPHER_AES_CCM_128_TAG_SIZE		16
+#define TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE		8
+
 #define TLS_SET_RECORD_TYPE	1
 #define TLS_GET_RECORD_TYPE	2
 
@@ -94,4 +101,12 @@ struct tls12_crypto_info_aes_gcm_256 {
 	unsigned char rec_seq[TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE];
 };
 
+struct tls12_crypto_info_aes_ccm_128 {
+	struct tls_crypto_info info;
+	unsigned char iv[TLS_CIPHER_AES_CCM_128_IV_SIZE];
+	unsigned char key[TLS_CIPHER_AES_CCM_128_KEY_SIZE];
+	unsigned char salt[TLS_CIPHER_AES_CCM_128_SALT_SIZE];
+	unsigned char rec_seq[TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE];
+};
+
 #endif /* _UAPI_LINUX_TLS_H */

net/tls/tls_main.c

@@ -469,27 +469,32 @@ static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
 
 	switch (crypto_info->cipher_type) {
 	case TLS_CIPHER_AES_GCM_128:
+		optsize = sizeof(struct tls12_crypto_info_aes_gcm_128);
+		break;
 	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;
-		}
-		rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info),
-				    optlen - sizeof(*crypto_info));
-		if (rc) {
-			rc = -EFAULT;
-			goto err_crypto_info;
-		}
+		optsize = sizeof(struct tls12_crypto_info_aes_gcm_256);
 		break;
 	}
+	case TLS_CIPHER_AES_CCM_128:
+		optsize = sizeof(struct tls12_crypto_info_aes_ccm_128);
+		break;
 	default:
 		rc = -EINVAL;
 		goto err_crypto_info;
 	}
 
+	if (optlen != optsize) {
+		rc = -EINVAL;
+		goto err_crypto_info;
+	}
+
+	rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info),
+			    optlen - sizeof(*crypto_info));
+	if (rc) {
+		rc = -EFAULT;
+		goto err_crypto_info;
+	}
+
 	if (tx) {
 #ifdef CONFIG_TLS_DEVICE
 		rc = tls_set_device_offload(sk, ctx);

net/tls/tls_sw.c

@@ -42,8 +42,6 @@
 #include <net/strparser.h>
 #include <net/tls.h>
 
-#define MAX_IV_SIZE	TLS_CIPHER_AES_GCM_128_IV_SIZE
-
 static int __skb_nsg(struct sk_buff *skb, int offset, int len,
                      unsigned int recursion_level)
 {
@@ -479,11 +477,18 @@ static int tls_do_encryption(struct sock *sk,
 	struct tls_rec *rec = ctx->open_rec;
 	struct sk_msg *msg_en = &rec->msg_encrypted;
 	struct scatterlist *sge = sk_msg_elem(msg_en, start);
-	int rc;
+	int rc, iv_offset = 0;
+
+	/* For CCM based ciphers, first byte of IV is a constant */
+	if (prot->cipher_type == TLS_CIPHER_AES_CCM_128) {
+		rec->iv_data[0] = TLS_AES_CCM_IV_B0_BYTE;
+		iv_offset = 1;
+	}
+
+	memcpy(&rec->iv_data[iv_offset], tls_ctx->tx.iv,
+	       prot->iv_size + prot->salt_size);
 
-	memcpy(rec->iv_data, tls_ctx->tx.iv, sizeof(rec->iv_data));
-	xor_iv_with_seq(prot->version, rec->iv_data,
-			tls_ctx->tx.rec_seq);
+	xor_iv_with_seq(prot->version, rec->iv_data, tls_ctx->tx.rec_seq);
 
 	sge->offset += prot->prepend_size;
 	sge->length -= prot->prepend_size;
@@ -1344,6 +1349,7 @@ static int decrypt_internal(struct sock *sk, struct sk_buff *skb,
 	struct scatterlist *sgout = NULL;
 	const int data_len = rxm->full_len - prot->overhead_size +
 			     prot->tail_size;
+	int iv_offset = 0;
 
 	if (*zc && (out_iov || out_sg)) {
 		if (out_iov)
@@ -1386,18 +1392,25 @@ static int decrypt_internal(struct sock *sk, struct sk_buff *skb,
 	aad = (u8 *)(sgout + n_sgout);
 	iv = aad + prot->aad_size;
 
+	/* For CCM based ciphers, first byte of nonce+iv is always '2' */
+	if (prot->cipher_type == TLS_CIPHER_AES_CCM_128) {
+		iv[0] = 2;
+		iv_offset = 1;
+	}
+
 	/* Prepare IV */
 	err = skb_copy_bits(skb, rxm->offset + TLS_HEADER_SIZE,
-			    iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
+			    iv + iv_offset + prot->salt_size,
 			    prot->iv_size);
 	if (err < 0) {
 		kfree(mem);
 		return err;
 	}
 	if (prot->version == TLS_1_3_VERSION)
-		memcpy(iv, tls_ctx->rx.iv, crypto_aead_ivsize(ctx->aead_recv));
+		memcpy(iv + iv_offset, tls_ctx->rx.iv,
+		       crypto_aead_ivsize(ctx->aead_recv));
 	else
-		memcpy(iv, tls_ctx->rx.iv, TLS_CIPHER_AES_GCM_128_SALT_SIZE);
+		memcpy(iv + iv_offset, tls_ctx->rx.iv, prot->salt_size);
 
 	xor_iv_with_seq(prot->version, iv, tls_ctx->rx.rec_seq);
 
@@ -2152,14 +2165,15 @@ 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 tls12_crypto_info_aes_ccm_128 *ccm_128_info;
 	struct tls_sw_context_tx *sw_ctx_tx = NULL;
 	struct tls_sw_context_rx *sw_ctx_rx = NULL;
 	struct cipher_context *cctx;
 	struct crypto_aead **aead;
 	struct strp_callbacks cb;
-	u16 nonce_size, tag_size, iv_size, rec_seq_size;
+	u16 nonce_size, tag_size, iv_size, rec_seq_size, salt_size;
 	struct crypto_tfm *tfm;
-	char *iv, *rec_seq, *key, *salt;
+	char *iv, *rec_seq, *key, *salt, *cipher_name;
 	size_t keysize;
 	int rc = 0;
 
@@ -2224,6 +2238,8 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
 		keysize = TLS_CIPHER_AES_GCM_128_KEY_SIZE;
 		key = gcm_128_info->key;
 		salt = gcm_128_info->salt;
+		salt_size = TLS_CIPHER_AES_GCM_128_SALT_SIZE;
+		cipher_name = "gcm(aes)";
 		break;
 	}
 	case TLS_CIPHER_AES_GCM_256: {
@@ -2239,6 +2255,25 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
 		keysize = TLS_CIPHER_AES_GCM_256_KEY_SIZE;
 		key = gcm_256_info->key;
 		salt = gcm_256_info->salt;
+		salt_size = TLS_CIPHER_AES_GCM_256_SALT_SIZE;
+		cipher_name = "gcm(aes)";
+		break;
+	}
+	case TLS_CIPHER_AES_CCM_128: {
+		nonce_size = TLS_CIPHER_AES_CCM_128_IV_SIZE;
+		tag_size = TLS_CIPHER_AES_CCM_128_TAG_SIZE;
+		iv_size = TLS_CIPHER_AES_CCM_128_IV_SIZE;
+		iv = ((struct tls12_crypto_info_aes_ccm_128 *)crypto_info)->iv;
+		rec_seq_size = TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE;
+		rec_seq =
+		((struct tls12_crypto_info_aes_ccm_128 *)crypto_info)->rec_seq;
+		ccm_128_info =
+		(struct tls12_crypto_info_aes_ccm_128 *)crypto_info;
+		keysize = TLS_CIPHER_AES_CCM_128_KEY_SIZE;
+		key = ccm_128_info->key;
+		salt = ccm_128_info->salt;
+		salt_size = TLS_CIPHER_AES_CCM_128_SALT_SIZE;
+		cipher_name = "ccm(aes)";
 		break;
 	}
 	default:
@@ -2268,24 +2303,24 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
 	prot->overhead_size = prot->prepend_size +
 			      prot->tag_size + prot->tail_size;
 	prot->iv_size = iv_size;
-	cctx->iv = kmalloc(iv_size + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
-			   GFP_KERNEL);
+	prot->salt_size = salt_size;
+	cctx->iv = kmalloc(iv_size + salt_size, GFP_KERNEL);
 	if (!cctx->iv) {
 		rc = -ENOMEM;
 		goto free_priv;
 	}
 	/* 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);
 	prot->rec_seq_size = rec_seq_size;
+	memcpy(cctx->iv, salt, salt_size);
+	memcpy(cctx->iv + salt_size, iv, iv_size);
 	cctx->rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL);
 	if (!cctx->rec_seq) {
 		rc = -ENOMEM;
 		goto free_iv;
 	}
 
 	if (!*aead) {
-		*aead = crypto_alloc_aead("gcm(aes)", 0, 0);
+		*aead = crypto_alloc_aead(cipher_name, 0, 0);
 		if (IS_ERR(*aead)) {
 			rc = PTR_ERR(*aead);
 			*aead = NULL;