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net/tls: add CHACHA20-POLY1305 specific behavior

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RFC 7905 defines special behavior for ChaCha-Poly TLS sessions.
The differences are in the calculation of nonce and the absence
of explicit IV. This behavior is like TLSv1.3 partly.

Signed-off-by: Vadim Fedorenko <vfedorenko@novek.ru>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Vadim Fedorenko 2020-11-24 18:24:48 +03:00 committed by Jakub Kicinski
parent 923c40c465
commit a6acbe6235
2 changed files with 10 additions and 5 deletions
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9
include/net/tls.h
View File

@ -502,7 +502,8 @@ static inline void tls_advance_record_sn(struct sock *sk,
if (tls_bigint_increment(ctx->rec_seq, prot->rec_seq_size))
tls_err_abort(sk, EBADMSG);
if (prot->version != TLS_1_3_VERSION)
if (prot->version != TLS_1_3_VERSION &&
prot->cipher_type != TLS_CIPHER_CHACHA20_POLY1305)
tls_bigint_increment(ctx->iv + prot->salt_size,
prot->iv_size);
}
@ -516,7 +517,8 @@ static inline void tls_fill_prepend(struct tls_context *ctx,
size_t pkt_len, iv_size = prot->iv_size;
pkt_len = plaintext_len + prot->tag_size;
if (prot->version != TLS_1_3_VERSION) {
if (prot->version != TLS_1_3_VERSION &&
prot->cipher_type != TLS_CIPHER_CHACHA20_POLY1305) {
pkt_len += iv_size;
memcpy(buf + TLS_NONCE_OFFSET,
@ -561,7 +563,8 @@ static inline void xor_iv_with_seq(struct tls_prot_info *prot, char *iv, char *s
{
int i;
if (prot->version == TLS_1_3_VERSION) {
if (prot->version == TLS_1_3_VERSION ||
prot->cipher_type == TLS_CIPHER_CHACHA20_POLY1305) {
for (i = 0; i < 8; i++)
iv[i + 4] ^= seq[i];
}

6
net/tls/tls_sw.c
View File

@ -1464,7 +1464,8 @@ static int decrypt_internal(struct sock *sk, struct sk_buff *skb,
kfree(mem);
return err;
}
if (prot->version == TLS_1_3_VERSION)
if (prot->version == TLS_1_3_VERSION ||
prot->cipher_type == TLS_CIPHER_CHACHA20_POLY1305)
memcpy(iv + iv_offset, tls_ctx->rx.iv,
crypto_aead_ivsize(ctx->aead_recv));
else
@ -2068,7 +2069,8 @@ static int tls_read_size(struct strparser *strp, struct sk_buff *skb)
data_len = ((header[4] & 0xFF) | (header[3] << 8));
cipher_overhead = prot->tag_size;
if (prot->version != TLS_1_3_VERSION)
if (prot->version != TLS_1_3_VERSION &&
prot->cipher_type != TLS_CIPHER_CHACHA20_POLY1305)
cipher_overhead += prot->iv_size;
if (data_len > TLS_MAX_PAYLOAD_SIZE + cipher_overhead +