path: root/man/man8/monkeysphere-authentication.8

.TH MONKEYSPHERE-SERVER "8" "June 2008" "monkeysphere" "User Commands"

.SH NAME

monkeysphere-authentication \- Monkeysphere authentication admin tool.

.SH SYNOPSIS

.B monkeysphere-authentication \fIsubcommand\fP [\fIargs\fP]
.br
.B monkeysphere-authentication expert \fIexpert-subcommand\fP [\fIargs\fP]

.SH DESCRIPTION

\fBMonkeysphere\fP is a framework to leverage the OpenPGP web of trust for
OpenSSH authentication.  OpenPGP keys are tracked via GnuPG, and added to the
authorized_keys and known_hosts files used by OpenSSH for connection
authentication.

\fBmonkeysphere-authentication\fP is a Monkeysphere server admin utility.

.SH SUBCOMMANDS

\fBmonkeysphere-authentication\fP takes various subcommands.
.TP
.B setup
Setup the server for Monkeysphere user authentication.  `s' may be
used in place of `setup'.
.TP
.B update-users [ACCOUNT]...
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'.
.TP
.B add-id-certifier KEYID
Instruct system to trust user identity certifications made by KEYID.
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'.
.TP
.B remove-id-certifier KEYID
Instruct system to ignore user identity certifications made by KEYID.
`c-' may be used in place of `remove-id-certifier'.
.TP
.B list-id-certifiers
List key IDs trusted by the system to certify user identities.  `c'
may be used in place of `list-id-certifiers'.
.TP
.B help
Output a brief usage summary.  `h' or `?' may be used in place of
`help'.
.TP
.B version
show version number

.SH "EXPERT" SUBCOMMANDS

Some commands are very unlikely to be needed by most administrators.
These commands must prefaced by the word `expert'.
.TP
.B diagnostics
Review the state of the server with respect to authentication.  `d'
may be used in place of `diagnostics'.
.TP
.B gpg-cmd
Execute a gpg command on the gnupg-authentication keyring as the
monkeysphere user.  This takes a single command (multiple gpg
arguments need to be quoted).  Use this command with caution, as
modifying the gnupg-authentication keyring can affect ssh user
authentication.

.SH 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
\fBadd-id-certifier\fP 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
\fBremove-id-certifier\fP command, and listed with the
\fBlist-id-certifiers\fP command.

Remote users will then 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 \fBupdate-users\fP command can then be used to generate
authorized_keys file for local accounts based on the authorized 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.
sshd can then use these monkeysphere generated authorized_keys files
to grant access to user accounts for remote users.  You must also tell
sshd to look at the monkeysphere-generated authorized_keys file for
user authentication by setting the following in the sshd_config:

AuthorizedKeysFile /var/lib/monkeysphere/authentication/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.

.SH ENVIRONMENT

The following environment variables will override those specified in
the config file (defaults in parentheses):
.TP
MONKEYSPHERE_MONKEYSPHERE_USER
User to control authentication keychain (monkeysphere).
.TP
MONKEYSPHERE_LOG_LEVEL
Set the log level (INFO).  Can be SILENT, ERROR, INFO, VERBOSE, DEBUG, in
increasing order of verbosity.
.TP
MONKEYSPHERE_KEYSERVER
OpenPGP keyserver to use (pool.sks-keyservers.net).
.TP
MONKEYSPHERE_AUTHORIZED_USER_IDS
Path to user authorized_user_ids file
(%h/.monkeysphere/authorized_user_ids).
.TP
MONKEYSPHERE_RAW_AUTHORIZED_KEYS
Path to user-controlled authorized_keys file.  `-' means not to add
user-controlled file (%h/.ssh/authorized_keys).

.SH FILES

.TP
/etc/monkeysphere/monkeysphere-authentication.conf
System monkeysphere-authentication config file.
.TP
/var/lib/monkeysphere/authentication/authorized_keys/USER
Monkeysphere-generated user authorized_keys files.

.SH AUTHOR

Written by:
Jameson Rollins <jrollins@fifthhorseman.net>,
Daniel Kahn Gillmor <dkg@fifthhorseman.net>,
Matthew Goins <mjgoins@openflows.com>

.SH SEE ALSO

.BR monkeysphere (1),
.BR monkeysphere-host (8),
.BR monkeysphere (7),
.BR gpg (1),
.BR ssh (1)