[PATCH][SMB3] allow files to be created with backslash in file name

[Jeremy Allison]

On Sat, Jan 02, 2021 at 06:19:39PM -0600, Steve French wrote:
>I agree with the idea of being safe (in the smbclient in this case),
>and not returning potentially dangerous file names (even if a very
>remote danger to the tool, smbclient in this case), but I am not
>convinced that the "user friendly" behavior is to reject the names
>with the rather confusing message - especially as it would mean that
>inserting a single file with an odd name into a server could make the
>whole share unusable for smbclient (e.g. in a backup scenario).  I
>agree with rejecting (or perhaps better skipping) it, but ... not sure
>any user would understand what SMBecho has to do with a server file
>name.

Dropping the connection on receipt of an invalid
name is the only safe response. We know the server
is insane and dangerous at that point and sending
invalid protocol responses.

Safer not to continue.

>"NT_STATUS_INVALID_NETWORK_RESPONSE listing \*
>smb: \> SMBecho failed (NT_STATUS_CONNECTION_DISCONNECTED). The
>connection is disconnected now"

The SMBecho is due to the keepalive failing once
the connection was dropped.