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net/tls: Fix authentication failure in CCM mode

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When the TLS cipher suite uses CCM mode, including AES CCM and
SM4 CCM, the first byte of the B0 block is flags, and the real
IV starts from the second byte. The XOR operation of the IV and
rec_seq should be skip this byte, that is, add the iv_offset.

Fixes: f295b3ae9f ("net/tls: Add support of AES128-CCM based ciphers")
Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
Cc: Vakul Garg <vakul.garg@nxp.com>
Cc: stable@vger.kernel.org # v5.2+
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tianjia Zhang 2021-11-29 17:32:12 +08:00 committed by David S. Miller
parent ef56b64001
commit 5961060692
1 changed files with 2 additions and 2 deletions
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4
net/tls/tls_sw.c
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@ -521,7 +521,7 @@ static int tls_do_encryption(struct sock *sk,
memcpy(&rec->iv_data[iv_offset], tls_ctx->tx.iv,
prot->iv_size + prot->salt_size);
xor_iv_with_seq(prot, rec->iv_data, tls_ctx->tx.rec_seq);
xor_iv_with_seq(prot, rec->iv_data + iv_offset, tls_ctx->tx.rec_seq);
sge->offset += prot->prepend_size;
sge->length -= prot->prepend_size;
@ -1499,7 +1499,7 @@ static int decrypt_internal(struct sock *sk, struct sk_buff *skb,
else
memcpy(iv + iv_offset, tls_ctx->rx.iv, prot->salt_size);
xor_iv_with_seq(prot, iv, tls_ctx->rx.rec_seq);
xor_iv_with_seq(prot, iv + iv_offset, tls_ctx->rx.rec_seq);
/* Prepare AAD */
tls_make_aad(aad, rxm->full_len - prot->overhead_size +