GPG-WKS-CLIENT(1) GNU Privacy Guard 2.2 GPG-WKS-CLIENT(1)

NAME
gpg-wks-client - Client for the Web Key Service

SYNOPSIS
gpg-wks-client [options] --supported user-id
gpg-wks-client [options] --check user-id
gpg-wks-client [options] --create fingerprint user-id
gpg-wks-client [options] --receive
gpg-wks-client [options] --read
gpg-wks-client [options] --mirror
gpg-wks-client [options] --install-key
gpg-wks-client [options] --remove-key
gpg-wks-client [options] --print-wkd-hash
gpg-wks-client [options] --print-wkd-url

DESCRIPTION
The gpg-wks-client is used to send requests to a Web Key Service provider. This is usually done to upload a key into a Web
Key Directory.

With the --supported command the caller can test whether a site supports the Web Key Service. The argument is an arbitrary
address in the to be tested domain. For example ‘foo@example.net’. The command returns success if the Web Key Service is
supported. The operation is silent; to get diagnostic output use the option --verbose. See option --with-colons for a
variant of this command.

With the --check command the caller can test whether a key exists for a supplied mail address. The command returns success
if a key is available.

The --create command is used to send a request for publication in the Web Key Directory. The arguments are the fingerprint
of the key and the user id to publish. The output from the command is a properly formatted mail with all standard headers.
This mail can be fed to sendmail(8) or any other tool to actually send that mail. If sendmail(8) is installed the option
--send can be used to directly send the created request. If the provider request a 'mailbox-only' user id and no such user
id is found, gpg-wks-client will try an additional user id.

The --receive and --read commands are used to process confirmation mails as send from the service provider. The former ex‐
pects an encrypted MIME messages, the latter an already decrypted MIME message. The result of these commands are another
mail which can be send in the same way as the mail created with --create.

The command --install-key manually installs a key into a local directory (see option -C) reflecting the structure of a WKD.
The arguments are a file with the keyblock and the user-id to install. If the first argument resembles a fingerprint the
key is taken from the current keyring; to force the use of a file, prefix the first argument with "./". If no arguments are
given the parameters are read from stdin; the expected format are lines with the fingerprint and the mailbox separated by a
space. The command --remove-key removes a key from that directory, its only argument is a user-id.

The command --mirror is similar to --install-key but takes the keys from the the LDAP server configured for Dirmngr. If no
arguments are given all keys and user ids are installed. If arguments are given they are taken as domain names to limit the
to be installed keys. The option --blacklist may be used to further limit the to be installed keys.

The command --print-wkd-hash prints the WKD user-id identifiers and the corresponding mailboxes from the user-ids given on
the command line or via stdin (one user-id per line).

The command --print-wkd-url prints the URLs used to fetch the key for the given user-ids from WKD. The meanwhile preferred
format with sub-domains is used here.

gpg-wks-client is not commonly invoked directly and thus it is not installed in the bin directory. Here is an example how
it can be invoked manually to check for a Web Key Directory entry for ‘foo@example.org’:

$(gpgconf --list-dirs libexecdir)/gpg-wks-client --check foo@example.net

OPTIONS
gpg-wks-client understands these options:

--send Directly send created mails using the sendmail command. Requires installation of that command.

--with-colons
This option has currently only an effect on the --supported command. If it is used all arguments on the command line
are taken as domain names and tested for WKD support. The output format is one line per domain with colon delimited
fields. The currently specified fields are (future versions may specify additional fields):

1 - domain
This is the domain name. Although quoting is not required for valid domain names this field is specified to
be quoted in standard C manner.

2 - WKD
If the value is true the domain supports the Web Key Directory.

3 - WKS
If the value is true the domain supports the Web Key Service protocol to upload keys to the directory.

4 - error-code
This may contain an gpg-error code to describe certain failures. Use ‘gpg-error CODE’ to explain the code.

5 - protocol-version
The minimum protocol version supported by the server.

6 - auth-submit
The auth-submit flag from the policy file of the server.

7 - mailbox-only
The mailbox-only flag from the policy file of the server.

--output file
-o Write the created mail to file instead of stdout. Note that the value - for file is the same as writing to stdout.

--status-fd n
Write special status strings to the file descriptor n. This program returns only the status messages SUCCESS or
FAILURE which are helpful when the caller uses a double fork approach and can't easily get the return code of the
process.

-C dir
--directory dir
Use dir as top level directory for the commands --mirror, --install-key and --remove-key. The default is ‘openpgp‐
key’.

--blacklist file
This option is used to exclude certain mail addresses from a mirror operation. The format of file is one mail ad‐
dress (just the addrspec, e.g. "postel@isi.edu") per line. Empty lines and lines starting with a '#' are ignored.

--verbose
Enable extra informational output.

--quiet
Disable almost all informational output.

--version
Print version of the program and exit.

--help Display a brief help page and exit.