FreeBSD - enable su for users.

While tinkering with freeBSD it convinced of its abilities qualifing as development box. Well at home FreeBSD runs over Fedora (in VirtualBox - Bridged Networking mode) and i can ssh to it both from desktop and laptop. But its really a wonder that FreeBSD denies root access remotely (aka. ssh). One easy and rather non-acceptable way is to allow root to login ( enter PermitRootLogin in /etc/ssh/sshd_config ), but it breaks the whole secure feature of FreeBSD.
The optimim way is to add a user to do 'su' which later can be used to remote login.

Steps to add user to root group (wheel).

# pw user mod -G wheel
# groups

For new users just add it to wheel along with default group while doing adduser.


Next you can allow su for all users.
Follow these steps.

# vi /etc/pam.d/su

and look for
'auth requisite pam_wheel.so no_warn auth_as_self noroot_ok exempt_if_empty' and comment it.

Happy sshing. "_"

TCP Header.

Learn this for if you are into networking.

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |          Source Port          |       Destination Port        |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                        Sequence Number                        |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                    Acknowledgment Number                      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |  Data |           |U|A|P|R|S|F|                               |
   | Offset| Reserved  |R|C|S|S|Y|I|            Window             |
   |       |           |G|K|H|T|N|N|                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |           Checksum            |         Urgent Pointer        |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                    Options                    |    Padding    |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                             data                              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                            TCP Header Format

          Note that one tick mark represents one bit position.

Details http://tools.ietf.org/html/rfc793#section-3.1

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