Ubuntu Manpage: monkeysphere-authentication - Monkeysphere authentication admin tool.

NAME

       monkeysphere-authentication - Monkeysphere authentication admin tool.

SYNOPSIS

       monkeysphere-authentication subcommand [args]

DESCRIPTION

       Monkeysphere  is  a  framework  to  leverage the OpenPGP Web of Trust (WoT) for key-based authentication.
       OpenPGP keys are tracked via GnuPG, and added to the authorized_keys files used by OpenSSH for connection
       authentication.

       monkeysphere-authentication is a Monkeysphere server admin utility for configuring and managing SSH  user
       authentication through the WoT.

SUBCOMMANDS

monkeysphere-authentication takes various subcommands:

update-users [USER]...
Rebuild the monkeysphere-controlled authorized_keys files. For each specified account, the user
ID's listed in the account's authorized_user_ids file are processed. For each user ID, 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
account's monkeysphere-controlled authorized_keys file. If the RAW_AUTHORIZED_KEYS variable is
set, then a separate authorized_keys file (usually ~USER/.ssh/authorized_keys) is appended to the
monkeysphere-controlled authorized_keys file. If no accounts are specified, then all accounts on
the system are processed. `u' may be used in place of `update-users'.

keys-for-user USER
Output to stdout authorized_keys lines for USER. This command behaves exactly like update-users
(above), except that the resulting authorized_keys lines are output to stdout, instead of being
written to the monkeysphere-controlled authorized_keys file.

refresh-keys
Refresh all keys in the monkeysphere-authentication keyring. If no accounts are specified, then
all accounts on the system are processed. `r' may be used in place of `refresh-keys'.

add-id-certifier KEYID|FILE
Instruct system to trust user identity certifications made by KEYID. The key ID will be loaded
from the keyserver. A file may be loaded instead of pulling the key from the keyserver by
specifying the path to the file as the argument, or by specifying `-' to load from stdin. Using
the `-n' or `--domain' option allows you to indicate that you only trust the given KEYID to make
identifications within a specific domain (e.g. "trust KEYID to certify user identities within the
@example.org domain"). A certifier trust level can be specified with the `-t' or `--trust' option
(possible values are `marginal' and `full' (default is `full')). A certifier trust depth can be
specified with the `-d' or `--depth' option (default is 1). `c+' may be used in place of
`add-id-certifier'.

remove-id-certifier KEYID
Instruct system to ignore user identity certifications made by KEYID. `c-' may be used in place
of `remove-id-certifier'.

list-id-certifiers
List key IDs trusted by the system to certify user identities. `c' may be used in place of
`list-id-certifiers'.

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'.

Other commands:

setup Setup the server in preparation for Monkeysphere user authentication. This command is idempotent
and run automatically by the other commands, and should therefore not usually need to be run
manually. `s' may be used in place of `setup'.

diagnostics
Review the state of the server with respect to authentication. `d' may be used in place of
`diagnostics'.

gpg-cmd
Execute a gpg command, as the monkeysphere user, on the monkeysphere authentication `sphere'
keyring. As of monkeysphere 0.36, this takes its arguments separately, not as a single string.
Use this command with caution, as modifying the authentication sphere keyring can affect ssh user
authentication.

SETUP USER AUTHENTICATION

       If the server will handle user authentication through monkeysphere-generated authorized_keys  files,  the
       server  must  be told which keys will act as identity certifiers.  This is done with the add-id-certifier
       command:

       # monkeysphere-authentication add-id-certifier KEYID

       where KEYID is the key ID of the server admin, or whoever's certifications should be  acceptable  to  the
       system  for  the  purposes  of  authenticating  remote users.  You can run this command multiple times to
       indicate that multiple certifiers are trusted.  You may also specify a filename instead of a key  ID,  as
       long  as  the  file  contains  a  single  OpenPGP  public  key.   Certifiers  can  be  removed  with  the
       remove-id-certifier command, and listed with the list-id-certifiers command.

       A remote user will be granted access to a local account based on the appropriately-signed and valid  keys
       associated   with  user  IDs  listed  in  that  account's  authorized_user_ids  file.   By  default,  the
       authorized_user_ids file for an account is ~/.monkeysphere/authorized_user_ids.  This can be  changed  in
       the monkeysphere-authentication.conf file.

       The  update-users command is used to generate authorized_keys files for a local account based on the user
       IDs listed in the account's authorized_user_ids file:

       # monkeysphere-authentication update-users USER

       Not specifying USER will cause all accounts on the system to updated.   The  ssh  server  can  use  these
       monkeysphere-generated authorized_keys files to grant access to user accounts for remote users.  In order
       for  sshd  to  look  at  the  monkeysphere-generated  authorized_keys  file  for user authentication, the
       AuthorizedKeysFile parameter must be set in  the  sshd_config  to  point  to  the  monkeysphere-generated
       authorized_keys files:

       AuthorizedKeysFile /var/lib/monkeysphere/authorized_keys/%u

       It  is  recommended  to  add "monkeysphere-authentication update-users" to a system crontab, so that user
       keys are kept up-to-date, and key revocations and expirations can be processed in a timely manner.

ENVIRONMENT

       The following environment variables will override  those  specified  in  the  config  file  (defaults  in
       parentheses):

       MONKEYSPHERE_MONKEYSPHERE_USER
              User to control authentication keychain. (monkeysphere)

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

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

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

       MONKEYSPHERE_AUTHORIZED_USER_IDS
              Path to user's authorized_user_ids file. %h gets replaced with the user's  homedir,  %u  with  the
              username.  (%h/.monkeysphere/authorized_user_ids)

       MONKEYSPHERE_RAW_AUTHORIZED_KEYS
              Path   to   regular   ssh-style   authorized_keys   file   to   append  to  monkeysphere-generated
              authorized_keys.  `none' means not to add any raw authorized_keys file.  %h gets replaced with the
              user's homedir, %u with the username. (%h/.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 users to abuse by other users
              on the system. (true)

FILES

       /etc/monkeysphere/monkeysphere-authentication.conf
              System monkeysphere-authentication config file.

       /etc/monkeysphere/monkeysphere-authentication-x509-anchors.crt or
       /etc/monkeysphere/monkeysphere-x509-anchors.crt
              If monkeysphere-authentication is configured to query an hkps keyserver,  it  will  use  the  PEM-
              encoded  X.509  Certificate Authority certificates in this file to validate any X.509 certificates
              used by the keyserver. If the monkeysphere-authentication-x509 file is present, the  monkeysphere-
              x509 file will be ignored.

       /var/lib/monkeysphere/authorized_keys/USER
              Monkeysphere-controlled user authorized_keys files.

       ~/.monkeysphere/authorized_user_ids
              A  list  of  OpenPGP  user  IDs,  one  per  line.   OpenPGP  keys with an exactly-matching User ID
              (calculated valid by the designated identity  certifiers),  will  have  any  valid  authorization-
              capable  keys  or  subkeys  added to the given user's authorized_keys file.  Any line with initial
              whitespace will be interpreted as ssh authorized_keys options applicable to the preceding User ID.

AUTHOR

       This man  page  was  written  by:  Jameson  Rollins  <jrollins@finestructure.net>,  Daniel  Kahn  Gillmor
       <dkg@fifthhorseman.net>, Matthew Goins <mjgoins@openflows.com>