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Test Your Knowledge in Computers #943
Difficulty: Medium
The Smurf attack is a DDOS attack in which large numbers of Internet Control Message Protocol (ICMP) packets with the intended victim's spoofed source IP are broadcast to a computer network using an IP broadcast address.
True or False?
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knife-ssh(1) [debian man page]

KNIFE-SSH(1)							    Chef Manual 						      KNIFE-SSH(1)

NAME
knife-ssh - Run a command or interactive session on multiple remote hosts SYNOPSIS
knife ssh QUERY COMMAND (options) -a, --attribute ATTR The attribute to use for opening the connection - default is fqdn -C, --concurrency NUM The number of concurrent connections -m, --manual-list QUERY is a space separated list of servers -P, --ssh-password PASSWORD The ssh password -x, --ssh-user USERNAME The ssh username -i, --identity-file IDENTITY_FILE The SSH identity file used for authentication -p, --ssh-port PORT The ssh port --[no-]host-key-verify Verify host key, enabled by default. DESCRIPTION
The ssh sub-command opens an ssh session to each of the nodes in the search results of the QUERY. This sub-command requires that the net-ssh-multi and highline Ruby libraries are installed. On Debian systems, these are the libnet-ssh-multi-ruby and libhighline-ruby pack- ages. They can also be installed as RubyGems (net-ssh-multi and highline, respectively). TERMINAL MULTIPLEXING AND TERMINAL TAB SUPPORT
knife ssh integrates with several terminal multiplexer programs to provide a more convenient means of managing multiple ssh sessions. When the COMMAND option matches one of these, knife ssh will create multiple interactive ssh sessions running locally in the terminal multi- plexer instead of invoking the command on the remote host. The available multiplexers are: interactive A built-in multiplexer. interactive supports running commands on a subset of the connected hosts in parallel screen(1) Runs ssh interactively inside screen. ~/.screenrc will be sourced if it exists. tmux(1) Runs ssh interactively inside tmux. macterm (Mac OS X only) Opens a Terminal.app window and creates a tab for each ssh session. You must install the rb-appscript gem before you can use this option. SEE ALSO
knife-search(1) AUTHOR
Chef was written by Adam Jacob adam@opscode.com with many contributions from the community. DOCUMENTATION
This manual page was written by Joshua Timberman joshua@opscode.com. Permission is granted to copy, distribute and / or modify this docu- ment under the terms of the Apache 2.0 License. CHEF
Knife is distributed with Chef. http://wiki.opscode.com/display/chef/Home Chef 10.12.0 June 2012 KNIFE-SSH(1)

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ssh-keysign(1M) 														   ssh-keysign(1M)

NAME
ssh-keysign - ssh helper program for host-based authentication SYNOPSIS
ssh-keysign ssh-keysign is used by ssh(1) to access the local host keys and generate the digital signature required during host-based authentication with SSH protocol version 2. This signature is of data that includes, among other items, the name of the client host and the name of the client user. ssh-keysign is disabled by default and can be enabled only in the global client configuration file /etc/ssh/ssh_config by setting Host- basedAuthentication to yes. ssh-keysign is not intended to be invoked by the user, but from ssh. See ssh(1) and sshd(1M) for more information about host-based authen- tication. /etc/ssh/ssh_config Controls whether ssh-keysign is enabled. /etc/ssh/ssh_host_dsa_key /etc/ssh/ssh_host_rsa_key These files contain the private parts of the host keys used to generate the digital signature. They should be owned by root, readable only by root, and not accessible to others. Because they are readable only by root, ssh-keysign must be set-uid root if host-based authentication is used. ssh-keysign will not sign host-based authentication data under the following conditions: o If the HostbasedAuthentication client configuration parameter is not set to yes in /etc/ssh/ssh_config. This setting cannot be overri- den in users' ~/.ssh/ssh_config files. o If the client hostname and username in /etc/ssh/ssh_config do not match the canonical hostname of the client where ssh-keysign is invoked and the name of the user invoking ssh-keysign. In spite of ssh-keysign's restrictions on the contents of the host-based authentication data, there remains the ability of users to use it as an avenue for obtaining the client's private host keys. For this reason host-based authentication is turned off by default. See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWsshu | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ ssh(1), sshd(1M), ssh_config(4), attributes(5) AUTHORS
Markus Friedl, markus@openbsd.org HISTORY
ssh-keysign first appeared in Ox 3.2. 9 Jun 2004 ssh-keysign(1M)

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