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GPG-WKS-CLIENT(1)	      GNU Privacy Guard 2.6	       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 diag-
     nostic  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 op-
     tion  --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 expects an encrypted MIME mes-
     sages, 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.

     All commands may also be given without the two leading dashes.

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  Direc-
		   tory.

	    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  fail-
		   ures.  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.	If  this  option
	    is	used  with the --check command and a key was found it is written
	    to the given file.

     --status-fd n
	    Write special status strings to the file descriptor n.  This program
	    returns only the status messages SUCCESS or FAILURE which are  help-
	    ful 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, --in-
	    stall-key and --remove-key.  The default is `openpgpkey'.

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

     --add-revocs
     --no-add-revocs
	    If	enabled  append revocation certificates for the same addrspec as
	    used in the WKD to the key.  Modern gpg version are able  to  import
	    and  apply	them  for  existing  keys.  Note that when used with the
	    --mirror command the revocation are searched in  the  local  keyring
	    and not in an LDAP directory.  The default is --add-revocs.

     --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.

EXAMPLES
     To  use  the  services with clients lacking integrated support, the mailcap
     mechanism can be used.  Simply put:
       application/vnd.gnupg.wks; \
	 /usr/local/bin/gpg-wks-client -v --read --send; \
	 needsterminal; \
	 description=WKS message
     into the `/etc/mailcap'.  This assumes  that  a  /usr/lib/sendmail  is  in-
     stalled.	With this configuration any real mail programs will run gpg-wks-
     client for messages received from a Web Key Service.

SEE ALSO
     gpg-wks-server(1)

GnuPG 2.5.18			   2026-06-12		       GPG-WKS-CLIENT(1)

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