How to retrieve "server_os" , "server_type" in string format if i am using SMB2 and higher protocol ??

[Nagendra008]

Hi All,

The fields  [ server_type, server_os ] are getting filled when connection establishment with ms-servers. But there was a check saying that don't send details if the max_protocol was greater than "NT1" which means SMB1. So is there a way to get these fields in string format or an API call by using  max_protocol = SMB2.

- I checked few API's but there are giving the server_type as uint.
- I want the data from ms_server as server_type = "Windows Server 2012".

Any help will be so helpful.


struct cli_state {
         /* The following strings are the
         * ones returned by the server if
         * the protocol > NT1.
         */
        char *server_type;
        char *server_os;
        char *server_domain;  ....... }
 
cli_start_connection_send: This where will get the min and max protocol
 
        if (signing_state == SMB_SIGNING_IPC_DEFAULT) {
                state->min_protocol = lp_client_ipc_min_protocol();
                state->max_protocol = lp_client_ipc_max_protocol();
        } else {
                state->min_protocol = lp_client_min_protocol();
                state->max_protocol = lp_client_max_protocol();
        }

Regards,
Nag

[Samba - samba-technical mailing list]

Hi Nag,

> The fields  *[ server_type, server_os ] *are getting filled when connection
> establishment with ms-servers. But there was a check saying that don't send
> details if the max_protocol was greater than "NT1" which means SMB1. *So is
> there a way to get these fields in string format* or an API call by using
> max_protocol = SMB2.
>
> - I checked few API's but there are giving the server_type as uint.
> - I want the data from ms_server as *server_type = "Windows Server 2012". *
>
> Any help will be so helpful.
>
>
> struct cli_state {
>          /* The following strings are the
>          * ones returned by the server if
>          * the protocol > NT1.
>          */
>         char *server_type;
>         char *server_os;
>         char *server_domain;  ....... }
>  

That information is not available with SMB2.
The server domain might be retrieved using wkssvc_NetWkstaGetInfo(),
but that's currently not used.

I already thought about filling the server_os or server_type with
the protocol string, e.g. "SMB3_11 Server".

There's also a bug in 4.6 and master where we fail to fill in this
fields even with NT1 and older protocols (I'll post patches for this soon).

metze

[Sasi Bhushan]

Can we have some quick temp patch for this as we don't have an RPC call to fetch the info?

/Sasi

[Nagendra008]

Hi metze,

Thanks for the information, Can we have some quick temp patch for this as we don't have an RPC call to fetch the info "server_os" && "server_type" in string format with highest protocol negotiation(SMB3_11)?.

Regards,
Nag

[Nagendra008]

Hi metze,

Do we have any patch release for "server_os" && "server_type" which give the os type in string format  with SMB2/3 in latest samba-4.6.3.

Because we have multiple dependencies on those strings.

Please do needful :)

Regards,
Nag

[Samba - samba-technical mailing list]

Hi Nag,

> Do we have any patch release for *"server_os" && "server_type" which give
> the os type in string format  with SMB2/3 in latest samba-4.6.3.*
>
> Because we have multiple dependencies on those strings.

I've filled https://bugzilla.samba.org/show_bug.cgi?id=12779 to fix
the strings with SMB1.

Doing some changes for SMB2/3 might be a separate thing for future versions.

metze

[Nagendra008]

Thanks metze for update :)

Regards,
Nag

[Nagendra008]

Hi metze,

Regarding the bug https://bugzilla.samba.org/show_bug.cgi?id=12779
 
"server_os" and "server_type" filling as empty string . Above bug marked as duplicate https://bugzilla.samba.org/show_bug.cgi?id=12824 and resolved providing two patches below.

https://attachments.samba.org/attachment.cgi?id=13261
https://attachments.samba.org/attachment.cgi?id=13269

Applied two patches on samba-4.6.6 and build the source code but i am still seeing sever_os and server_type as NULL fileds with SMB2 and higher protocols.

Tested the patch with rpcclient binary, Please look into the attached gdb trace of rpcclient.
gdb_trace_after_patch.txt

Please let me know if there is anything have to do to retrive the "sever_os" and "server_type" with SMB2 protocol.

Thanks,
Nag