gpgconf - Online in the Cloud

PROGRAM:

NAME

gpgconf - Modify .gnupg home directories

SYNOPSIS

gpgconf [options] --list-components
gpgconf [options] --list-options component
gpgconf [options] --change-options component

DESCRIPTION

The gpgconf is a utility to automatically and reasonable safely query and modify
configuration files in the ‘.gnupg’ home directory. It is designed not to be invoked
manually by the user, but automatically by graphical user interfaces (GUI). ([Please note
that currently no locking is done, so concurrent access should be avoided. There are some
precautions to avoid corruption with concurrent usage, but results may be inconsistent and
some changes may get lost. The stateless design makes it difficult to provide more
guarantees.])

gpgconf provides access to the configuration of one or more components of the GnuPG
system. These components correspond more or less to the programs that exist in the GnuPG
framework, like GnuPG, GPGSM, DirMngr, etc. But this is not a strict one-to-one
relationship. Not all configuration options are available through gpgconf. gpgconf
provides a generic and abstract method to access the most important configuration options
that can feasibly be controlled via such a mechanism.

gpgconf can be used to gather and change the options available in each component, and can
also provide their default values. gpgconf will give detailed type information that can
be used to restrict the user's input without making an attempt to commit the changes.

gpgconf provides the backend of a configuration editor. The configuration editor would
usually be a graphical user interface program, that allows to display the current options,
their default values, and allows the user to make changes to the options. These changes
can then be made active with gpgconf again. Such a program that uses gpgconf in this way
will be called GUI throughout this section.

COMMANDS

One of the following commands must be given:

--list-components
List all components. This is the default command used if none is specified.

--check-programs
List all available backend programs and test whether they are runnable.

--list-options component
List all options of the component component.

--change-options component
Change the options of the component component.

--check-options component
Check the options for the component component.

--apply-defaults
Update all configuration files with values taken from the global configuration file
(usually ‘/etc/gnupg/gpgconf.conf’).

--list-dirs
Lists the directories used by gpgconf. One directory is listed per line, and each
line consists of a colon-separated list where the first field names the directory
type (for example sysconfdir) and the second field contains the percent-escaped
directory. Although they are not directories, the socket file names used by gpg-
agent and dirmngr are printed as well. Note that the socket file names and the
homedir lines are the default names and they may be overridden by command line
switches.

--list-config [filename]
List the global configuration file in a colon separated format. If filename is
given, check that file instead.

--check-config [filename]
Run a syntax check on the global configuration file. If filename is given, check
that file instead.

--reload [component]
Reload all or the given component. This is basically the same as sending a SIGHUP
to the component. Components which don't support reloading are ignored.

--launch [component]
If the component is not already running, start it. component must be a daemon.
This is in general not required because the system starts these daemons as needed.
However, external software making direct use of gpg-agent or dirmngr may use this
command to ensure that they are started.

--kill [component]
Kill the given component. Components which support killing are gpg-agent and
scdaemon. Components which don't support reloading are ignored. Note that as of
now reload and kill have the same effect for scdaemon.

OPTIONS

The following options may be used:

-o file

--output file
Write output to file. Default is to write to stdout.

-v

--verbose
Outputs additional information while running. Specifically, this extends numerical
field values by human-readable descriptions.

-q

--quiet
Try to be as quiet as possible.

-n

--dry-run
Do not actually change anything. This is currently only implemented for --change-
options and can be used for testing purposes.

-r

--runtime
Only used together with --change-options. If one of the modified options can be
changed in a running daemon process, signal the running daemon to ask it to reparse
its configuration file after changing.

This means that the changes will take effect at run-time, as far as this is
possible. Otherwise, they will take effect at the next start of the respective
backend programs.

USAGE

The command --list-components will list all components that can be configured with
gpgconf. Usually, one component will correspond to one GnuPG-related program and contain
the options of that programs configuration file that can be modified using gpgconf.
However, this is not necessarily the case. A component might also be a group of selected
options from several programs, or contain entirely virtual options that have a special
effect rather than changing exactly one option in one configuration file.

A component is a set of configuration options that semantically belong together.
Furthermore, several changes to a component can be made in an atomic way with a single
operation. The GUI could for example provide a menu with one entry for each component, or
a window with one tabulator sheet per component.

The command argument --list-components lists all available components, one per line. The
format of each line is:

name:description:pgmname:

name This field contains a name tag of the component. The name tag is used to specify
the component in all communication with gpgconf. The name tag is to be used
verbatim. It is thus not in any escaped format.

description
The string in this field contains a human-readable description of the component.
It can be displayed to the user of the GUI for informational purposes. It is
percent-escaped and localized.

pgmname
The string in this field contains the absolute name of the program's file. It can
be used to unambiguously invoke that program. It is percent-escaped.

Example:
$ gpgconf --list-components
gpg:GPG for OpenPGP:/usr/local/bin/gpg2:
gpg-agent:GPG Agent:/usr/local/bin/gpg-agent:
scdaemon:Smartcard Daemon:/usr/local/bin/scdaemon:
gpgsm:GPG for S/MIME:/usr/local/bin/gpgsm:
dirmngr:Directory Manager:/usr/local/bin/dirmngr:

Checking programs

The command --check-programs is similar to --list-components but works on backend programs
and not on components. It runs each program to test whether it is installed and runnable.
This also includes a syntax check of all config file options of the program.

The command argument --check-programs lists all available programs, one per line. The
format of each line is:

name:description:pgmname:avail:okay:cfgfile:line:error:

name This field contains a name tag of the program which is identical to the name of the
component. The name tag is to be used verbatim. It is thus not in any escaped
format. This field may be empty to indicate a continuation of error descriptions
for the last name. The description and pgmname fields are then also empty.

description
The string in this field contains a human-readable description of the component.
It can be displayed to the user of the GUI for informational purposes. It is
percent-escaped and localized.

pgmname
The string in this field contains the absolute name of the program's file. It can
be used to unambiguously invoke that program. It is percent-escaped.

avail The boolean value in this field indicates whether the program is installed and
runnable.

okay The boolean value in this field indicates whether the program's config file is
syntactically okay.

cfgfile
If an error occurred in the configuration file (as indicated by a false value in
the field okay), this field has the name of the failing configuration file. It is
percent-escaped.

line If an error occurred in the configuration file, this field has the line number of
the failing statement in the configuration file. It is an unsigned number.

error If an error occurred in the configuration file, this field has the error text of
the failing statement in the configuration file. It is percent-escaped and
localized.

In the following example the dirmngr is not runnable and the configuration file of
scdaemon is not okay.

$ gpgconf --check-programs
gpg:GPG for OpenPGP:/usr/local/bin/gpg2:1:1:
gpg-agent:GPG Agent:/usr/local/bin/gpg-agent:1:1:
scdaemon:Smartcard Daemon:/usr/local/bin/scdaemon:1:0:
gpgsm:GPG for S/MIME:/usr/local/bin/gpgsm:1:1:
dirmngr:Directory Manager:/usr/local/bin/dirmngr:0:0:

The command configuration file in the same manner as --check-programs, but only for the
component component.

Listing options

Every component contains one or more options. Options may be gathered into option groups
to allow the GUI to give visual hints to the user about which options are related.

The command argument lists all options (and the groups they belong to) in the component
component, one per line. component must be the string in the field name in the output of
the --list-components command.

There is one line for each option and each group. First come all options that are not in
any group. Then comes a line describing a group. Then come all options that belong into
each group. Then comes the next group and so on. There does not need to be any group
(and in this case the output will stop after the last non-grouped option).

The format of each line is:

name:flags:level:description:type:alt-type:argname:default:argdef:value

name This field contains a name tag for the group or option. The name tag is used to
specify the group or option in all communication with gpgconf. The name tag is to
be used verbatim. It is thus not in any escaped format.

flags The flags field contains an unsigned number. Its value is the OR-wise combination
of the following flag values:

group (1)
If this flag is set, this is a line describing a group and not an option.

The following flag values are only defined for options (that is, if the group flag is not
used).

optional arg (2)
If this flag is set, the argument is optional. This is never set for type 0
(none) options.

list (4)
If this flag is set, the option can be given multiple times.

runtime (8)
If this flag is set, the option can be changed at runtime.

default (16)
If this flag is set, a default value is available.

default desc (32)
If this flag is set, a (runtime) default is available. This and the default
flag are mutually exclusive.

no arg desc (64)
If this flag is set, and the optional arg flag is set, then the option has a
special meaning if no argument is given.

no change (128)
If this flag is set, gpgconf ignores requests to change the value. GUI
frontends should grey out this option. Note, that manual changes of the
configuration files are still possible.

level This field is defined for options and for groups. It contains an unsigned number
that specifies the expert level under which this group or option should be
displayed. The following expert levels are defined for options (they have
analogous meaning for groups):

basic (0)
This option should always be offered to the user.

advanced (1)
This option may be offered to advanced users.

expert (2)
This option should only be offered to expert users.

invisible (3)
This option should normally never be displayed, not even to expert users.

internal (4)
This option is for internal use only. Ignore it.

The level of a group will always be the lowest level of all options it contains.

description
This field is defined for options and groups. The string in this field contains a
human-readable description of the option or group. It can be displayed to the user
of the GUI for informational purposes. It is percent-escaped and localized.

type This field is only defined for options. It contains an unsigned number that
specifies the type of the option's argument, if any. The following types are
defined:

Basic types:

none (0)
No argument allowed.

string (1)
An unformatted string.

int32 (2)
A signed number.

uint32 (3)
An unsigned number.

Complex types:

pathname (32)
A string that describes the pathname of a file. The file does not
necessarily need to exist.

ldap server (33)
A string that describes an LDAP server in the format:

hostname:port:username:password:base_dn

key fingerprint (34)
A string with a 40 digit fingerprint specifying a certificate.

pub key (35)
A string that describes a certificate by user ID, key ID or fingerprint.

sec key (36)
A string that describes a certificate with a key by user ID, key ID or
fingerprint.

alias list (37)
A string that describes an alias list, like the one used with gpg's group
option. The list consists of a key, an equal sign and space separated
values.

More types will be added in the future. Please see the alt-type field for information on
how to cope with unknown types.

alt-type
This field is identical to type, except that only the types 0 to 31 are allowed.
The GUI is expected to present the user the option in the format specified by type.
But if the argument type type is not supported by the GUI, it can still display the
option in the more generic basic type alt-type. The GUI must support all the
defined basic types to be able to display all options. More basic types may be
added in future versions. If the GUI encounters a basic type it doesn't support,
it should report an error and abort the operation.

argname
This field is only defined for options with an argument type type that is not 0.
In this case it may contain a percent-escaped and localised string that gives a
short name for the argument. The field may also be empty, though, in which case a
short name is not known.

default
This field is defined only for options for which the default or default desc flag
is set. If the default flag is set, its format is that of an option argument (see:
[Format conventions], for details). If the default value is empty, then no default
is known. Otherwise, the value specifies the default value for this option. If
the default desc flag is set, the field is either empty or contains a description
of the effect if the option is not given.

argdef This field is defined only for options for which the optional arg flag is set. If
the no arg desc flag is not set, its format is that of an option argument (see:
[Format conventions], for details). If the default value is empty, then no default
is known. Otherwise, the value specifies the default argument for this option. If
the no arg desc flag is set, the field is either empty or contains a description of
the effect of this option if no argument is given.

value This field is defined only for options. Its format is that of an option argument.
If it is empty, then the option is not explicitly set in the current configuration,
and the default applies (if any). Otherwise, it contains the current value of the
option. Note that this field is also meaningful if the option itself does not take
a real argument (in this case, it contains the number of times the option appears).

Changing options

The command to change the options of the component component to the specified values.
component must be the string in the field name in the output of the --list-components
command. You have to provide the options that shall be changed in the following format on
standard input:

name:flags:new-value

name This is the name of the option to change. name must be the string in the field
name in the output of the --list-options command.

flags The flags field contains an unsigned number. Its value is the OR-wise combination
of the following flag values:

default (16)
If this flag is set, the option is deleted and the default value is used
instead (if applicable).

new-value
The new value for the option. This field is only defined if the default flag is
not set. The format is that of an option argument. If it is empty (or the field
is omitted), the default argument is used (only allowed if the argument is optional
for this option). Otherwise, the option will be set to the specified value.

The output of the command is the same as that of --check-options for the modified
configuration file.

Examples:

To set the force option, which is of basic type none (0):

$ echo 'force:0:1' | gpgconf --change-options dirmngr

To delete the force option:

$ echo 'force:16:' | gpgconf --change-options dirmngr

The --runtime option can influence when the changes take effect.

Listing global options

Sometimes it is useful for applications to look at the global options file ‘gpgconf.conf’.
The colon separated listing format is record oriented and uses the first field to identify
the record type:

k This describes a key record to start the definition of a new ruleset for a
user/group. The format of a key record is:

k:user:group:

user This is the user field of the key. It is percent escaped. See the
definition of the gpgconf.conf format for details.

group This is the group field of the key. It is percent escaped.

r This describes a rule record. All rule records up to the next key record make up a
rule set for that key. The format of a rule record is:

r:::component:option:flags:value:

component
This is the component part of a rule. It is a plain string.

option This is the option part of a rule. It is a plain string.

flag This is the flags part of a rule. There may be only one flag per rule but
by using the same component and option, several flags may be assigned to an
option. It is a plain string.

value This is the optional value for the option. It is a percent escaped string
with a single quotation mark to indicate a string. The quotation mark is
only required to distinguish between no value specified and an empty string.

Unknown record types should be ignored. Note that there is intentionally no feature to
change the global option file through gpgconf.

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