.SH NAME
-monkeysphere \- MonkeySphere client user interface
+monkeysphere - Monkeysphere client user interface
.SH SYNOPSIS
-.B monkeysphere \fIcommand\fP [\fIargs\fP]
+.B monkeysphere \fIsubcommand\fP [\fIargs\fP]
.SH DESCRIPTION
-MonkeySphere is a system to leverage the OpenPGP Web of Trust for ssh
-authentication and encryption. OpenPGP keys are tracked via GnuPG,
-and added to the ssh authorized_keys and known_hosts files to be used
-for authentication of ssh connections.
+\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\fP is the MonkeySphere client utility.
+\fBmonkeysphere\fP is the Monkeysphere client utility.
.SH SUBCOMMANDS
\fBmonkeysphere\fP takes various subcommands:
.TP
-.B update-known_hosts [HOST]...
+.B 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 URIs),
-querying a keyserver if specified. If a key is found, it will be
-converted to an ssh key, and any matching ssh keys will be removed
-from the user's known_hosts file. If the found key is acceptable (see
-KEY ACCEPTABILITY), then the key will be updated and re-added to the
-known_hosts file. If no gpg key is found for the host, then nothing
-is done. If no hosts are specified, all hosts listed in the
-known_hosts file will be processed. `k' may be used in place of
-`update-known_hosts'.
-.TP
-.B update-authorized_keys
-Update the monkeysphere authorized_keys file. For each user ID in the
-user's authorized_user_ids file, gpg will be queried for keys
-associated with that user ID, querying a keyserver if specified. If a
-key is found, it will be converted to an ssh key, and any matching ssh
-keys will be removed from the user's authorized_keys file. If the
-found key is acceptable (see KEY ACCEPTABILITY), then the key will be
-updated and re-added to the authorized_keys file. If no gpg key is
-found for the user ID, then nothing is done. `a' may be used in place
-of `update-authorized_keys'.
-.TP
-.B gen-subkey KEYID
-Generate an `a` capable subkey. For the primary key with the
-specified key ID, generate a subkey with "authentication" capability
-that can be used for MonkeySphere transactions. `g' may be used in
-place of `gen-subkey'.
+queried for a key associated with the host URI (see HOST
+IDENTIFICATION in
+.BR monkeysphere(7)),
+optionally querying a keyserver.
+If an acceptable key is found for the host (see KEY ACCEPTABILITY in
+.BR 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'.
+.TP
+.B 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
+.BR 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'.
+.TP
+.B 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'.
+.TP
+.B 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:
+
+.B ssh \-o ProxyCommand="monkeysphere ssh\-proxycommand %h %p" ...
+
+or by adding the following line to your ~/.ssh/config script:
+
+.B 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.:
+
+.B 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.
+
+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.
+
+.TP
+.B 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
+.BR 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'.
+.TP
+.B sshfpr KEYID
+Output the ssh fingerprint of a key in your gpg keyring. `f' may be
+used in place of `fingerprint'.
+.TP
+.B keys\-from\-userid USERID
+Output to stdout all acceptable keys for a given user ID literal.
+`u' may be used in place of `keys\-from\-userid'.
+.TP
+.B version
+Show the monkeysphere version number. `v' may be used in place of
+`version'.
.TP
.B help
Output a brief usage summary. `h' or `?' may be used in place of
`help'.
-.SH HOST URIs
-
-Host OpenPGP keys have associated user IDs that use the ssh URI
-specification for the host, ie. "ssh://host.full.domain".
+.SH ENVIRONMENT
-.SH KEY ACCEPTABILITY
-
-GPG keys are considered acceptable if the following criteria are met:
+The following environment variables will override those specified in
+the monkeysphere.conf configuration file (defaults in parentheses):
+.TP
+MONKEYSPHERE_LOG_LEVEL
+Set the log level. Can be SILENT, ERROR, INFO, VERBOSE, DEBUG,
+in increasing order of verbosity. (INFO)
+.TP
+MONKEYSPHERE_GNUPGHOME, GNUPGHOME
+GnuPG home directory. (~/.gnupg)
+.TP
+MONKEYSPHERE_KEYSERVER
+OpenPGP keyserver to use. (pool.sks-keyservers.net)
+.TP
+MONKEYSPHERE_CHECK_KEYSERVER
+Whether or not to check keyserver when making gpg queries. (true)
+.TP
+MONKEYSPHERE_KNOWN_HOSTS
+Path to ssh known_hosts file. (~/.ssh/known_hosts)
+.TP
+MONKEYSPHERE_HASH_KNOWN_HOSTS
+Whether or not to hash to the known_hosts file entries. (true)
+.TP
+MONKEYSPHERE_AUTHORIZED_KEYS
+Path to ssh authorized_keys file. (~/.ssh/authorized_keys)
+.TP
+MONKEYSPHERE_PROMPT
+If set to `false', never prompt the user for confirmation. (true)
.TP
-.B capability
-The key must have the "authentication" ("a") usage flag set.
+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)
.TP
-.B validity
-The key must be "fully" valid, and must not be expired or revoked.
+MONKEYSPHERE_SUBKEYS_FOR_AGENT
+A space-separated list of authentication-capable subkeys to add to the
+ssh agent with subkey-to-ssh-agent.
.SH FILES
.TP
-~/.config/monkeysphere/monkeysphere.conf
+~/.monkeysphere/monkeysphere.conf
User monkeysphere config file.
.TP
/etc/monkeysphere/monkeysphere.conf
System-wide monkeysphere config file.
.TP
-~/.config/monkeysphere/authorized_user_ids
-OpenPGP user IDs associated with keys that will be checked for
-addition to the authorized_keys file.
+~/.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.
.SH AUTHOR
-Written by Jameson Rollins <jrollins@fifthhorseman.net>
+Written by:
+Jameson Rollins <jrollins@fifthhorseman.net>,
+Daniel Kahn Gillmor <dkg@fifthhorseman.net>
.SH SEE ALSO
-.BR monkeysphere-ssh-proxycommand (1),
-.BR monkeysphere-server (8),
+.BR monkeysphere\-host (8),
+.BR monkeysphere\-authentication (8),
+.BR monkeysphere (7),
.BR ssh (1),
+.BR ssh\-add (1),
.BR gpg (1)
projects / monkeysphere.git / blobdiff