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ksmbd: fix wrong signingkey creation when encryption is AES256

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commit 7a891d4b62 upstream.

MacOS and Win11 support AES256 encrytion and it is included in the cipher
array of encryption context. Especially on macOS, The most preferred
cipher is AES256. Connecting to ksmbd fails on newer MacOS clients that
support AES256 encryption. MacOS send disconnect request after receiving
final session setup response from ksmbd. Because final session setup is
signed with signing key was generated incorrectly.
For signging key, 'L' value should be initialized to 128 if key size is
16bytes.

Cc: stable@vger.kernel.org
Reported-by: Miao Lihua <441884205@qq.com>
Tested-by: Miao Lihua <441884205@qq.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Namjae Jeon
2023-03-01 00:01:21 +09:00
committed by Greg Kroah-Hartman
parent 0608b3da04
commit e54752f596
1 changed files with 3 additions and 2 deletions
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5
fs/ksmbd/auth.c
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@@ -727,8 +727,9 @@ static int generate_key(struct ksmbd_conn *conn, struct ksmbd_session *sess,
goto smb3signkey_ret;
}
if (conn->cipher_type == SMB2_ENCRYPTION_AES256_CCM ||
conn->cipher_type == SMB2_ENCRYPTION_AES256_GCM)
if (key_size == SMB3_ENC_DEC_KEY_SIZE &&
(conn->cipher_type == SMB2_ENCRYPTION_AES256_CCM ||
conn->cipher_type == SMB2_ENCRYPTION_AES256_GCM))
rc = crypto_shash_update(CRYPTO_HMACSHA256(ctx), L256, 4);
else
rc = crypto_shash_update(CRYPTO_HMACSHA256(ctx), L128, 4);