GPG-AGENT(1) GNU Privacy Guard 2.4 GPG-AGENT(1)
NAME
gpg-agent - Secret key management for GnuPG
SYNOPSIS
gpg-agent [--homedir dir] [--options file] [options]
gpg-agent [--homedir dir] [--options file] [options] --server
gpg-agent [--homedir dir] [--options file] [options] --daemon [com-
mand_line]
DESCRIPTION
gpg-agent is a daemon to manage secret (private) keys independently from
any protocol. It is used as a backend for gpg and gpgsm as well as for
a couple of other utilities.
The agent is automatically started on demand by gpg, gpgsm, gpgconf, or
gpg-connect-agent. Thus there is no reason to start it manually. In
case you want to use the included Secure Shell Agent you may start the
agent using:
gpg-connect-agent /bye
If you want to manually terminate the currently-running agent, you can
safely do so with:
gpgconf --kill gpg-agent
You should always add the following lines to your .bashrc or whatever
initialization file is used for all shell invocations:
GPG_TTY=$(tty)
export GPG_TTY
It is important that this environment variable always reflects the out-
put of the tty command. For W32 systems this option is not required.
Please make sure that a proper pinentry program has been installed under
the default filename (which is system dependent) or use the option
pinentry-program to specify the full name of that program. It is often
useful to install a symbolic link from the actual used pinentry (e.g.
‘/usr/bin/pinentry-gtk’) to the expected one (e.g. ‘/usr/bin/pinentry’).
COMMANDS
Commands are not distinguished from options except for the fact that
only one command is allowed.
--version
Print the program version and licensing information. Note that
you cannot abbreviate this command.
--help
-h Print a usage message summarizing the most useful command-line
options. Note that you cannot abbreviate this command.
--dump-options
Print a list of all available options and commands. Note that
you cannot abbreviate this command.
--server
Run in server mode and wait for commands on the stdin. The de-
fault mode is to create a socket and listen for commands there.
--daemon [command line]
Start the gpg-agent as a daemon; that is, detach it from the con-
sole and run it in the background.
As an alternative you may create a new process as a child of gpg-
agent: gpg-agent --daemon /bin/sh. This way you get a new shell
with the environment setup properly; after you exit from this
shell, gpg-agent terminates within a few seconds.
--supervised
Run in the foreground, sending logs by default to stderr, and
listening on provided file descriptors, which must already be
bound to listening sockets. This option is deprecated and not
supported on Windows.
If in ‘common.conf’ the option no-autostart is set, any start at-
tempts will be ignored.
In --supervised mode, different file descriptors can be provided
for use as different socket types (e.g. ssh, extra) as long as
they are identified in the environment variable LISTEN_FDNAMES
(see sd_listen_fds(3) on some Linux distributions for more infor-
mation on this convention).
OPTIONS
Options may either be used on the command line or, after stripping off
the two leading dashes, in the configuration file.
--options file
Reads configuration from file instead of from the default per-
user configuration file. The default configuration file is named
‘gpg-agent.conf’ and expected in the ‘.gnupg’ directory directly
below the home directory of the user. This option is ignored if
used in an options file.
--homedir dir
Set the name of the home directory to dir. If this option is not
used, the home directory defaults to ‘~/.gnupg’. It is only rec-
ognized when given on the command line. It also overrides any
home directory stated through the environment variable
‘GNUPGHOME’ or (on Windows systems) by means of the Registry en-
try HKCU\Software\GNU\GnuPG:HomeDir.
On Windows systems it is possible to install GnuPG as a portable
application. In this case only this command line option is con-
sidered, all other ways to set a home directory are ignored.
-v
--verbose
Outputs additional information while running. You can increase
the verbosity by giving several verbose commands to gpg-agent,
such as ‘-vv’.
-q
--quiet
Try to be as quiet as possible.
--batch
Don't invoke a pinentry or do any other thing requiring human in-
teraction.
--faked-system-time epoch
This option is only useful for testing; it sets the system time
back or forth to epoch which is the number of seconds elapsed
since the year 1970.
--debug-level level
Select the debug level for investigating problems. level may be a
numeric value or a keyword:
none No debugging at all. A value of less than 1 may be used
instead of the keyword.
basic Some basic debug messages. A value between 1 and 2 may be
used instead of the keyword.
advanced
More verbose debug messages. A value between 3 and 5 may
be used instead of the keyword.
expert Even more detailed messages. A value between 6 and 8 may
be used instead of the keyword.
guru All of the debug messages you can get. A value greater
than 8 may be used instead of the keyword. The creation
of hash tracing files is only enabled if the keyword is
used.
How these messages are mapped to the actual debugging flags is not spec-
ified and may change with newer releases of this program. They are how-
ever carefully selected to best aid in debugging.
--debug flags
Set debug flags. All flags are or-ed and flags may be given in C
syntax (e.g. 0x0042) or as a comma separated list of flag names.
To get a list of all supported flags the single word "help" can
be used. This option is only useful for debugging and the behav-
ior may change at any time without notice.
--debug-all
Same as --debug=0xffffffff
--debug-wait n
When running in server mode, wait n seconds before entering the
actual processing loop and print the pid. This gives time to at-
tach a debugger.
--debug-quick-random
This option inhibits the use of the very secure random quality
level (Libgcrypt’s GCRY_VERY_STRONG_RANDOM) and degrades all re-
quest down to standard random quality. It is only used for test-
ing and should not be used for any production quality keys. This
option is only effective when given on the command line.
On GNU/Linux, another way to quickly generate insecure keys is to
use rngd to fill the kernel's entropy pool with lower quality
random data. rngd is typically provided by the rng-tools pack-
age. It can be run as follows: ‘sudo rngd -f -r /dev/urandom’.
--debug-pinentry
This option enables extra debug information pertaining to the
Pinentry. As of now it is only useful when used along with --de-
bug 1024.
--no-detach
Don't detach the process from the console. This is mainly useful
for debugging.
--steal-socket
In --daemon mode, gpg-agent detects an already running gpg-agent
and does not allow one to start a new instance. This option can
be used to override this check: the new gpg-agent process will
try to take over the communication sockets from the already run-
ning process and start anyway. This option should in general not
be used.
-s
--sh
-c
--csh Format the info output in daemon mode for use with the standard
Bourne shell or the C-shell respectively. The default is to
guess it based on the environment variable SHELL which is correct
in almost all cases.
--grab
--no-grab
Tell the pinentry to grab the keyboard and mouse. This option
should be used on X-Servers to avoid X-sniffing attacks. Any use
of the option --grab overrides an used option --no-grab. The de-
fault is --no-grab.
--log-file file
Append all logging output to file. This is very helpful in see-
ing what the agent actually does. Use ‘socket://’ to log to
socket. If neither a log file nor a log file descriptor has been
set on a Windows platform, the Registry entry HKCU\Soft-
ware\GNU\GnuPG:DefaultLogFile, if set, is used to specify the
logging output.
--no-allow-mark-trusted
Do not allow clients to mark keys as trusted, i.e. put them into
the ‘trustlist.txt’ file. This makes it harder for users to in-
advertently accept Root-CA keys.
--no-user-trustlist
Entirely ignore the user trust list and consider only the global
trustlist (‘/etc/gnupg/trustlist.txt’). This implies the [option
--no-allow-mark-trusted].
--sys-trustlist-name file
Changes the default name for the global trustlist from
"trustlist.txt" to file. If file does not contain any slashes
and does not start with "~/" it is searched in the system config-
uration directory (‘/etc/gnupg’).
--allow-preset-passphrase
This option allows the use of gpg-preset-passphrase to seed the
internal cache of gpg-agent with passphrases.
--no-allow-loopback-pinentry
--allow-loopback-pinentry
Disallow or allow clients to use the loopback pinentry features;
see the option pinentry-mode for details. Allow is the default.
The --force option of the Assuan command DELETE_KEY is also con-
trolled by this option: The option is ignored if a loopback
pinentry is disallowed.
--no-allow-external-cache
Tell Pinentry not to enable features which use an external cache
for passphrases.
Some desktop environments prefer to unlock all credentials with
one master password and may have installed a Pinentry which em-
ploys an additional external cache to implement such a policy.
By using this option the Pinentry is advised not to make use of
such a cache and instead always ask the user for the requested
passphrase.
--allow-emacs-pinentry
Tell Pinentry to allow features to divert the passphrase entry to
a running Emacs instance. How this is exactly handled depends on
the version of the used Pinentry.
--ignore-cache-for-signing
This option will let gpg-agent bypass the passphrase cache for
all signing operation. Note that there is also a per-session op-
tion to control this behavior but this command line option takes
precedence.
--default-cache-ttl n
Set the time a cache entry is valid to n seconds. The default is
600 seconds. Each time a cache entry is accessed, the entry's
timer is reset. To set an entry's maximum lifetime, use
max-cache-ttl. Note that a cached passphrase may not be evicted
immediately from memory if no client requests a cache operation.
This is due to an internal housekeeping function which is only
run every few seconds.
--default-cache-ttl-ssh n
Set the time a cache entry used for SSH keys is valid to n sec-
onds. The default is 1800 seconds. Each time a cache entry is
accessed, the entry's timer is reset. To set an entry's maximum
lifetime, use max-cache-ttl-ssh.
--max-cache-ttl n
Set the maximum time a cache entry is valid to n seconds. After
this time a cache entry will be expired even if it has been ac-
cessed recently or has been set using gpg-preset-passphrase. The
default is 2 hours (7200 seconds).
--max-cache-ttl-ssh n
Set the maximum time a cache entry used for SSH keys is valid to
n seconds. After this time a cache entry will be expired even if
it has been accessed recently or has been set using gpg-pre-
set-passphrase. The default is 2 hours (7200 seconds).
--enforce-passphrase-constraints
Enforce the passphrase constraints by not allowing the user to
bypass them using the ``Take it anyway'' button.
--min-passphrase-len n
Set the minimal length of a passphrase. When entering a new
passphrase shorter than this value a warning will be displayed.
Defaults to 8.
--min-passphrase-nonalpha n
Set the minimal number of digits or special characters required
in a passphrase. When entering a new passphrase with less than
this number of digits or special characters a warning will be
displayed. Defaults to 1.
--check-passphrase-pattern file
--check-sym-passphrase-pattern file
Check the passphrase against the pattern given in file. When en-
tering a new passphrase matching one of these pattern a warning
will be displayed. If file does not contain any slashes and does
not start with "~/" it is searched in the system configuration
directory (‘/etc/gnupg’). The default is not to use any pattern
file. The second version of this option is only used when creat-
ing a new symmetric key to allow the use of different patterns
for such passphrases.
Security note: It is known that checking a passphrase against a
list of pattern or even against a complete dictionary is not very
effective to enforce good passphrases. Users will soon figure up
ways to bypass such a policy. A better policy is to educate
users on good security behavior and optionally to run a
passphrase cracker regularly on all users passphrases to catch
the very simple ones.
--max-passphrase-days n
Ask the user to change the passphrase if n days have passed since
the last change. With --enforce-passphrase-constraints set the
user may not bypass this check.
--enable-passphrase-history
This option does nothing yet.
--pinentry-invisible-char char
This option asks the Pinentry to use char for displaying hidden
characters. char must be one character UTF-8 string. A Pinentry
may or may not honor this request.
--pinentry-timeout n
This option asks the Pinentry to timeout after n seconds with no
user input. The default value of 0 does not ask the pinentry to
timeout, however a Pinentry may use its own default timeout value
in this case. A Pinentry may or may not honor this request.
--pinentry-formatted-passphrase
This option asks the Pinentry to enable passphrase formatting
when asking the user for a new passphrase and masking of the
passphrase is turned off.
If passphrase formatting is enabled, then all non-breaking space
characters are stripped from the entered passphrase. Passphrase
formatting is mostly useful in combination with passphrases gen-
erated with the GENPIN feature of some Pinentries. Note that
such a generated passphrase, if not modified by the user, skips
all passphrase constraints checking because such constraints
would actually weaken the generated passphrase.
--pinentry-program filename
Use program filename as the PIN entry. The default is installa-
tion dependent. With the default configuration the name of the
default pinentry is ‘pinentry’; if that file does not exist but a
‘pinentry-basic’ exist the latter is used.
On a Windows platform the default is to use the first existing
program from this list: ‘bin\pinentry.exe’,
‘..\Gpg4win\bin\pinentry.exe’, ‘..\Gpg4win\pinentry.exe’,
‘..\GNU\GnuPG\pinentry.exe’, ‘..\GNU\bin\pinentry.exe’,
‘bin\pinentry-basic.exe’ where the file names are relative to the
GnuPG installation directory.
--pinentry-touch-file filename
By default the filename of the socket gpg-agent is listening for
requests is passed to Pinentry, so that it can touch that file
before exiting (it does this only in curses mode). This option
changes the file passed to Pinentry to filename. The special
name /dev/null may be used to completely disable this feature.
Note that Pinentry will not create that file, it will only change
the modification and access time.
--scdaemon-program filename
Use program filename as the Smartcard daemon. The default is in-
stallation dependent and can be shown with the gpgconf command.
--disable-scdaemon
Do not make use of the scdaemon tool. This option has the effect
of disabling the ability to do smartcard operations. Note, that
enabling this option at runtime does not kill an already forked
scdaemon.
--disable-check-own-socket
gpg-agent employs a periodic self-test to detect a stolen socket.
This usually means a second instance of gpg-agent has taken over
the socket and gpg-agent will then terminate itself. This option
may be used to disable this self-test for debugging purposes.
--use-standard-socket
--no-use-standard-socket
--use-standard-socket-p
Since GnuPG 2.1 the standard socket is always used. These op-
tions have no more effect. The command gpg-agent --use-stan-
dard-socket-p will thus always return success.
--display string
--ttyname string
--ttytype string
--lc-ctype string
--lc-messages string
--xauthority string
These options are used with the server mode to pass localization
information.
--keep-tty
--keep-display
Ignore requests to change the current tty or X window system's
DISPLAY variable respectively. This is useful to lock the pinen-
try to pop up at the tty or display you started the agent.
--listen-backlog n
Set the size of the queue for pending connections. The default
is 64.
--extra-socket name
The extra socket is created by default, you may use this option
to change the name of the socket. To disable the creation of the
socket use ``none'' or ``/dev/null'' for name.
Also listen on native gpg-agent connections on the given socket.
The intended use for this extra socket is to setup a Unix domain
socket forwarding from a remote machine to this socket on the lo-
cal machine. A gpg running on the remote machine may then con-
nect to the local gpg-agent and use its private keys. This en-
ables decrypting or signing data on a remote machine without ex-
posing the private keys to the remote machine.
--enable-extended-key-format
--disable-extended-key-format
These options are obsolete and have no effect. The extended key
format is used for years now and has been supported since 2.1.12.
Existing keys in the old format are migrated to the new format as
soon as they are touched.
--enable-ssh-support
--enable-win32-openssh-support
--enable-putty-support
On Unix platforms the OpenSSH Agent protocol is always enabled,
but gpg-agent will only set the SSH_AUTH_SOCK variable if the op-
tion enable-ssh-support is given. Some Linux distributions use
the presence of this option to decide whether the old ssh-agent
shall be started.
On Windows support for the native ssh implementation must be en-
abled using the the option enable-win32-openssh-support. For us-
ing gpg-agent as a replacement for PuTTY's Pageant, the option
enable-putty-support must be enabled.
In this mode of operation, the agent does not only implement the
gpg-agent protocol, but also the agent protocol used by OpenSSH
(through a separate socket or via Named Pipes) or the protocol
used by PuTTY. Consequently, this allows one to use the gpg-
agent as a drop-in replacement for the ssh-agent.
SSH keys, which are to be used through the agent, need to be
added to the gpg-agent initially through the ssh-add utility.
When a key is added, ssh-add will ask for the password of the
provided key file and send the unprotected key material to the
agent; this causes the gpg-agent to ask for a passphrase, which
is to be used for encrypting the newly received key and storing
it in a gpg-agent specific directory.
Once a key has been added to the gpg-agent this way, the gpg-
agent will be ready to use the key.
Note: in case the gpg-agent receives a signature request, the
user might need to be prompted for a passphrase, which is neces-
sary for decrypting the stored key. Since the ssh-agent protocol
does not contain a mechanism for telling the agent on which dis-
play/terminal it is running, gpg-agent's ssh-support will use the
TTY or X display where gpg-agent has been started. To switch
this display to the current one, the following command may be
used:
gpg-connect-agent updatestartuptty /bye
Although all GnuPG components try to start the gpg-agent as needed, this
is not possible for the ssh support because ssh does not know about it.
Thus if no GnuPG tool which accesses the agent has been run, there is no
guarantee that ssh is able to use gpg-agent for authentication. To fix
this you may start gpg-agent if needed using this simple command:
gpg-connect-agent /bye
Adding the --verbose shows the progress of starting the agent.
The --enable-putty-support is only available under Windows and allows
the use of gpg-agent with the ssh implementation putty. This is similar
to the regular ssh-agent support but makes use of Windows message queue
as required by putty.
The order in which keys are presented to ssh are:
Negative Use-for-ssh values
If a key file has the attribute "Use-for-ssh" and
its value is
negative, these keys are presented first to ssh.
The negative
values are capped at -999 with -999 being lower
ranked than -1.
These values can be used to prefer on-disk keys over
keys taken
from active cards.
Active cards
Active cards (inserted into a card reader or plugged
in tokens)
are always tried; they are ordered by their serial
numbers.
Keys listed in the sshcontrol file
Non-disabled keys from the sshcontrol file are pre-
sented in the
order they appear in this file. Note that the ssh-
control file
is deprecated.
Positive Use-for-ssh values
If a key file has the attribute "Use-for-ssh" and
its value is
"yes", "true", or any positive number the key is
presented in
the order of their values. "yes" and "true" have a
value of 1;
other values are capped at 99999.
Editing the "Use-for-ssh" values can be done with an editor or using
gpg-connect-agent and "KEYATTR" (Remember to append a colon to the key;
i.e. use "Use-for-ssh:").
--ssh-fingerprint-digest
Select the digest algorithm used to compute ssh fingerprints that
are communicated to the user, e.g. in pinentry dialogs. OpenSSH
has transitioned from using MD5 to the more secure SHA256.
--auto-expand-secmem n
Allow Libgcrypt to expand its secure memory area as required.
The optional value n is a non-negative integer with a suggested
size in bytes of each additionally allocated secure memory area.
The value is rounded up to the next 32 KiB; usual C style pre-
fixes are allowed. For an heavy loaded gpg-agent with many con-
current connection this option avoids sign or decrypt errors due
to out of secure memory error returns.
--s2k-calibration milliseconds
Change the default calibration time to milliseconds. The given
value is capped at 60 seconds; a value of 0 resets to the com-
piled-in default. This option is re-read on a SIGHUP (or gpgconf
--reload gpg-agent) and the S2K count is then re-calibrated.
--s2k-count n
Specify the iteration count used to protect the passphrase. This
option can be used to override the auto-calibration done by de-
fault. The auto-calibration computes a count which requires by
default 100ms to mangle a given passphrase. See also --s2k-cali-
bration.
To view the actually used iteration count and the milliseconds
required for an S2K operation use:
gpg-connect-agent 'GETINFO s2k_count' /bye
gpg-connect-agent 'GETINFO s2k_time' /bye
To view the auto-calibrated count use:
gpg-connect-agent 'GETINFO s2k_count_cal' /bye
EXAMPLES
It is important to set the environment variable GPG_TTY in your login
shell, for example in the ‘~/.bashrc’ init script:
export GPG_TTY=$(tty)
If you enabled the Ssh Agent Support, you also need to tell ssh about it
by adding this to your init script:
unset SSH_AGENT_PID
if [ "${gnupg_SSH_AUTH_SOCK_by:-0}" -ne $$ ]; then
export SSH_AUTH_SOCK="$(gpgconf --list-dirs agent-ssh-socket)"
fi
FILES
There are a few configuration files needed for the operation of the
agent. By default they may all be found in the current home directory
(see: [option --homedir]).
gpg-agent.conf
This is the standard configuration file read by gpg-agent on
startup. It may contain any valid long option; the leading
two dashes may not be entered and the option may not be abbre-
viated.
This file is also read after a SIGHUP however only a few
options will actually have an effect. This default name may be
changed on the command line (see: [option --options]).
You should backup this file.
trustlist.txt
This is the list of trusted keys. You should backup this file.
Comment lines, indicated by a leading hash mark, as well as
empty
lines are ignored. To mark a key as trusted you need to enter
its
fingerprint followed by a space and a capital letter S. Colons
may optionally be used to separate the bytes of a fingerprint;
this
enables cutting and pasting the fingerprint from a key listing
output. If
the line is prefixed with a ! the key is explicitly marked as
not trusted.
Here is an example where two keys are marked as ultimately
trusted
and one as not trusted:
.RS 2
# CN=Wurzel ZS 3,O=Intevation GmbH,C=DE
A6935DD34EF3087973C706FC311AA2CCF733765B S
# CN=PCA-1-Verwaltung-02/O=PKI-1-Verwaltung/C=DE
DC:BD:69:25:48:BD:BB:7E:31:6E:BB:80:D3:00:80:35:D4:F8:A6:CD S
# CN=Root-CA/O=Schlapphuete/L=Pullach/C=DE
!14:56:98:D3:FE:9C:CA:5A:31:6E:BC:81:D3:11:4E:00:90:A3:44:C2 S
.fi
Before entering a key into this file, you need to ensure its
authenticity. How to do this depends on your organisation; your
administrator might have already entered those keys which are deemed
trustworthy enough into this file. Places where to look for the
fingerprint of a root certificate are letters received from the CA or
the website of the CA (after making 100% sure that this is indeed the
website of that CA). You may want to consider disallowing interactive
updates of this file by using the [option --no-allow-mark-trusted].
It might even be advisable to change the permissions to read-only so
that this file can't be changed inadvertently.
As a special feature a line include-default will include a global
list of trusted certificates (e.g. ‘/etc/gnupg/trustlist.txt’).
This global list is also used if the local list is not available;
the [option --no-user-trustlist] enforces the use of only
this global list.
It is possible to add further flags after the S for use by the
caller:
relax Relax checking of some root certificate requirements. As of now this
flag allows the use of root certificates with a missing basicConstraints
attribute (despite that it is a MUST for CA certificates) and disables
CRL checking for the root certificate.
cm If validation of a certificate finally issued by a CA with this flag set
fails, try again using the chain validation model.
qual The CA is allowed to issue certificates for qualified signatures.
This flag has an effect only if used in the global list. This is now
the preferred way to mark such CA; the old way of having a separate
file ‘qualified.txt’ is still supported.
de-vs The CA is part of an approved PKI for the German classification level
VS-NfD. It is only valid in the global trustlist. As of now this is
used only for documentation purpose.
sshcontrol
This file is used when support for the secure shell agent protocol has
been enabled (see: [option --enable-ssh-support]). Only keys present in
this file are used in the SSH protocol. You should backup this file.
This file is deprecated in favor of the "Use-for-ssh" attribute in the
key files.
The ssh-add tool may be used to add new entries to this file;
you may also add them manually. Comment lines, indicated by a leading
hash mark, as well as empty lines are ignored. An entry starts with
optional whitespace, followed by the keygrip of the key given as 40 hex
digits, optionally followed by the caching TTL in seconds and another
optional field for arbitrary flags. A non-zero TTL overrides the global
default as set by --default-cache-ttl-ssh.
The only flag support is confirm. If this flag is found for a
key, each use of the key will pop up a pinentry to confirm the use of
that key. The flag is automatically set if a new key was loaded into
gpg-agent using the option -c of the ssh-add
command.
The keygrip may be prefixed with a ! to disable an entry.
The following example lists exactly one key. Note that keys available
through a OpenPGP smartcard in the active smartcard reader are
implicitly added to this list; i.e. there is no need to list them.
# Key added on: 2011-07-20 20:38:46
# Fingerprint: 5e:8d:c4:ad:e7:af:6e:27:8a:d6:13:e4:79:ad:0b:81
34B62F25E277CF13D3C6BCEBFD3F85D08F0A864B 0 confirm
private-keys-v1.d/
This is the directory where gpg-agent stores the private keys.
Each
key is stored in a file with the name made up of the keygrip
and the
suffix ‘key’. You should backup all files in this directory
and take great care to keep this backup closed away.
Note that on larger installations, it is useful to put predefined files
into the directory ‘/etc/skel/.gnupg’ so that newly created users start
up with a working configuration. For existing users the a small helper
script is provided to create these files (see: [addgnupghome]).
SIGNALS
A running gpg-agent may be controlled by signals, i.e. using the kill
command to send a signal to the process.
Here is a list of supported signals:
SIGHUP This signal flushes all cached passphrases and if the program has
been started with a configuration file, the configuration file is
read again. Only certain options are honored: quiet, verbose,
debug, debug-all, debug-level, debug-pinentry, no-grab, pinen-
try-program, pinentry-invisible-char, default-cache-ttl,
max-cache-ttl, ignore-cache-for-signing, s2k-count, no-allow-ex-
ternal-cache, allow-emacs-pinentry, no-allow-mark-trusted, dis-
able-scdaemon, and disable-check-own-socket. scdaemon-program is
also supported but due to the current implementation, which calls
the scdaemon only once, it is not of much use unless you manually
kill the scdaemon.
SIGTERM
Shuts down the process but waits until all current requests are
fulfilled. If the process has received 3 of these signals and
requests are still pending, a shutdown is forced.
SIGINT Shuts down the process immediately.
SIGUSR1
Dump internal information to the log file.
SIGUSR2
This signal is used for internal purposes.
SEE ALSO
gpg(1), gpgsm(1), gpgconf(1), gpg-connect-agent(1), scdaemon(1)
The full documentation for this tool is maintained as a Texinfo manual.
If GnuPG and the info program are properly installed at your site, the
command
info gnupg
should give you access to the complete manual including a menu structure
and an index.
GnuPG 2.4.7 2024-11-22 GPG-AGENT(1)
Generated by dwww version 1.16 on Tue Dec 16 04:53:22 CET 2025.