monkeysphere - Online in the Cloud

PROGRAM:

NAME

monkeysphere - Monkeysphere client user interface

SYNOPSIS

monkeysphere subcommand [args]

DESCRIPTION

Monkeysphere is a framework to leverage the OpenPGP web of trust for OpenSSH and TLS key-
based authentication. OpenPGP keys are tracked via GnuPG, and added to the
authorized_keys and known_hosts files used by OpenSSH for connection authentication.
Monkeysphere can also be used by a validation agent to validate TLS connections (e.g.
https).

monkeysphere is the Monkeysphere client utility.

SUBCOMMANDS

monkeysphere takes various subcommands:

update-known_hosts [HOST]...
Update the known_hosts file. For each specified host, gpg will be queried for a
key associated with the host URI (see HOST IDENTIFICATION in monkeysphere(7)),
optionally querying a keyserver. If an acceptable key is found for the host (see
KEY ACCEPTABILITY in monkeysphere(7)), the key is added to the user's known_hosts
file. If a key is found but is unacceptable for the host, any matching keys are
removed from the user's known_hosts file. If no gpg key is found for the host,
nothing is done. If no hosts are specified, all hosts listed in the known_hosts
file will be processed. This subcommand will exit with a status of 0 if at least
one acceptable key was found for a specified host, 1 if no matching keys were found
at all, and 2 if matching keys were found but none were acceptable. `k' may be
used in place of `update-known_hosts'.

update-authorized_keys
Update the authorized_keys file for the user executing the command (see
MONKEYSPHERE_AUTHORIZED_KEYS in ENVIRONMENT, below). First all monkeysphere keys
are cleared from the authorized_keys file. Then, for each user ID in the user's
authorized_user_ids file, gpg will be queried for keys associated with that user
ID, optionally querying a keyserver. If an acceptable key is found (see KEY
ACCEPTABILITY in monkeysphere(7)), the key is added to the user's authorized_keys
file. If a key is found but is unacceptable for the user ID, any matching keys are
removed from the user's authorized_keys file. If no gpg key is found for the user
ID, nothing is done. This subcommand will exit with a status of 0 if at least one
acceptable key was found for a user ID, 1 if no matching keys were found at all,
and 2 if matching keys were found but none were acceptable. `a' may be used in
place of `update-authorized_keys'.

gen-subkey [KEYID]
Generate an authentication subkey for a private key in your GnuPG keyring. KEYID
is the key ID for the primary key for which the subkey with "authentication"
capability will be generated. If no key ID is specified, but only one key exists
in the secret keyring, that key will be used. The length of the generated key can
be specified with the `--length' or `-l' option. `g' may be used in place of
`gen-subkey'.

ssh-proxycommand [--no-connect] HOST [PORT]
An ssh ProxyCommand that can be used to trigger a monkeysphere update of the ssh
known_hosts file for a host that is being connected to with ssh. This works by
updating the known_hosts file for the host first, before an attempted connection to
the host is made. Once the known_hosts file has been updated, a TCP connection to
the host is made by exec'ing netcat(1). Regular ssh communication is then done
over this netcat TCP connection (see ProxyCommand in ssh_config(5) for more info).

This command is meant to be run as the ssh "ProxyCommand". This can either be done
by specifying the proxy command on the command line:

ssh -o ProxyCommand="monkeysphere ssh-proxycommand %h %p" ...

or by adding the following line to your ~/.ssh/config script:

ProxyCommand monkeysphere ssh-proxycommand %h %p

The script can easily be incorporated into other ProxyCommand scripts by calling it
with the "--no-connect" option, i.e.:

monkeysphere ssh-proxycommand --no-connect $HOST $PORT

This will run everything except the final exec of netcat to make the TCP connection
to the host. In this way this command can be added to another proxy command that
does other stuff, and then makes the connection to the host itself. For example,
in ~/.ssh/config:

ProxyCommand sh -c 'monkeysphere ssh-proxycommand --no-connect %h %p ; ssh -W %h:%p
jumphost.example.net'

KEYSERVER CHECKING: The proxy command has a fairly nuanced policy for when
keyservers are queried when processing a host. If the host userID is not found in
either the user's keyring or in the known_hosts file, then the keyserver is queried
for the host userID. If the host userID is found in the user's keyring, then the
keyserver is not checked. This assumes that the keyring is kept up-to-date, in a
cronjob or the like, so that revocations are properly handled. If the host userID
is not found in the user's keyring, but the host is listed in the known_hosts file,
then the keyserver is not checked. This last policy might change in the future,
possibly by adding a deferred check, so that hosts that go from non-monkeysphere-
enabled to monkeysphere-enabled will be properly checked.

Setting the CHECK_KEYSERVER variable in the config file or the
MONKEYSPHERE_CHECK_KEYSERVER environment variable to either `true' or `false' will
override the keyserver-checking policy defined above and either always or never
check the keyserver for host key updates.

subkey-to-ssh-agent [ssh-add arguments]
Push all authentication-capable subkeys in your GnuPG secret keyring into your
running ssh-agent. Additional arguments are passed through to ssh-add(1). For
example, to remove the authentication subkeys, pass an additional `-d' argument.
To require confirmation on each use of the key, pass `-c'. The
MONKEYSPHERE_SUBKEYS_FOR_AGENT environment can be used to specify the full
fingerprints of specific keys to add to the agent (space separated), instead of
adding them all. `s' may be used in place of `subkey-to-ssh-agent'.

keys-for-userid USERID
Output to stdout all acceptable keys for a given user ID. `u' may be used in place
of `keys-for-userid'.

sshfprs-for-userid USERID
Output the ssh fingerprints of acceptable keys for a given user ID.

version
Show the monkeysphere version number. `v' may be used in place of `version'.

help Output a brief usage summary. `h' or `?' may be used in place of `help'.

ENVIRONMENT

The following environment variables will override those specified in the monkeysphere.conf
configuration file (defaults in parentheses):

MONKEYSPHERE_LOG_LEVEL
Set the log level. Can be SILENT, ERROR, INFO, VERBOSE, DEBUG, in increasing order
of verbosity. (INFO)

MONKEYSPHERE_GNUPGHOME, GNUPGHOME
GnuPG home directory. (~/.gnupg)

MONKEYSPHERE_KEYSERVER
OpenPGP keyserver to use. (pool.sks-keyservers.net)

MONKEYSPHERE_CHECK_KEYSERVER
Whether or not to check keyserver when making gpg queries. (true)

MONKEYSPHERE_KNOWN_HOSTS
Path to ssh known_hosts file. (~/.ssh/known_hosts)

MONKEYSPHERE_HASH_KNOWN_HOSTS
Whether or not to hash to the known_hosts file entries. (false)

MONKEYSPHERE_AUTHORIZED_KEYS
Path to ssh authorized_keys file. (~/.ssh/authorized_keys)

MONKEYSPHERE_PROMPT
If set to `false', never prompt the user for confirmation. (true)

MONKEYSPHERE_STRICT_MODES
If set to `false', ignore too-loose permissions on known_hosts, authorized_keys,
and authorized_user_ids files. NOTE: setting this to false may expose you to abuse
by other users on the system. (true)

MONKEYSPHERE_SUBKEYS_FOR_AGENT
A space-separated list of authentication-capable subkeys to add to the ssh agent
with subkey-to-ssh-agent.

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