ksmbd: disable SMB2_GLOBAL_CAP_ENCRYPTION for SMB 3.1.1

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commit 83912d6d55 upstream.

According to the official Microsoft MS-SMB2 document section 3.3.5.4, this
flag should be used only for 3.0 and 3.0.2 dialects. Setting it for 3.1.1
is a violation of the specification.

This causes my Windows 10 client to detect an anomaly in the negotiation,
and disable encryption entirely despite being explicitly enabled in ksmbd,
causing all data transfers to go in plain text.

Fixes: e2f34481b2 ("cifsd: add server-side procedures for SMB3")
Cc: stable@vger.kernel.org # v5.15
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Marcos Del Sol Vives <marcos@orca.pet>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Marcos Del Sol Vives 2021-12-16 11:37:22 +01:00 • committed by Greg Kroah-Hartman

parent f43ba86a82

commit a2c144d176

2 changed files with 21 additions and 7 deletions

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3

fs/ksmbd/smb2ops.c

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25

fs/ksmbd/smb2pdu.c

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