mssqlclient: Add -target-ip

[Palkovsky]

mssqlclient doesn't have equivalent of -target-ip, which makes it impossible to perform Kerberos authetication without proper DNS configuration on the local machine.

As it is now, this is what happens (without the DNS configured):

• using hostname as target: The tool won't be able to resolve the target IP, so it won't even open the connection.
• using IP as target with -k: The tool will open the connection, but will not be able to find/request proper TGS with the service name as it only has the IP address.

[gabrielg5]

Hi @Palkovsky, thanks for your PR!

was checking the code and was thinking that perhaps we could take advantage of it and, being that we are adding a new parameter to the example, create a new group for this connection parameters.

Based on the smbclient implementation, in order to standardize them, we can define the connection group and put there this -target-ip parameter and move the -dc-ip one

impacket/examples/smbclient.py

Lines 52 to 61 in 6c9a1aa

	group = parser.add_argument_group('connection')
	group.add_argument('-dc-ip', action='store', metavar="ip address",
	help='IP Address of the domain controller. If omitted it will use the domain part (FQDN) specified in '
	'the target parameter')
	group.add_argument('-target-ip', action='store', metavar="ip address",
	help='IP Address of the target machine. If omitted it will use whatever was specified as target. '
	'This is useful when target is the NetBIOS name and you cannot resolve it')
	group.add_argument('-port', choices=['139', '445'], nargs='?', default='445', metavar="destination port",
	help='Destination port to connect to SMB Server')

From the specific change you implemented, tested it and worked great!
thank you

[Palkovsky]

Hello, thanks for the response. I'll handle this over the weekend.

[Palkovsky]

Done, please take a look.

[gabrielg5]

Awesome, thanks for changing it!

merging 🚀