DIRMNGR(8) GNU Privacy Guard 2.2 DIRMNGR(8)
NAME
dirmngr - CRL and OCSP daemon
SYNOPSIS
dirmngr [options] command [args]
DESCRIPTION
Since version 2.1 of GnuPG, dirmngr takes care of accessing the OpenPGP
keyservers. As with previous versions it is also used as a server for
managing and downloading certificate revocation lists (CRLs) for X.509
certificates, downloading X.509 certificates, and providing access to
OCSP providers. Dirmngr is invoked internally by gpg, gpgsm, or via
the gpg-connect-agent tool.
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.
This is only used for testing.
--daemon
Run in background daemon mode and listen for commands on a
socket. This is the way dirmngr is started on demand by the
other GnuPG components. To force starting dirmngr it is in gen-
eral best to use gpgconf --launch dirmngr.
--supervised
Run in the foreground, sending logs to stderr, and listening on
file descriptor 3, which must already be bound to a listening
socket. This is useful when running under systemd or other sim-
ilar process supervision schemes. This option is not supported
on Windows.
--list-crls
List the contents of the CRL cache on stdout. This is probably
only useful for debugging purposes.
--load-crl file
This command requires a filename as additional argument, and it
will make Dirmngr try to import the CRL in file into it's cache.
Note, that this is only possible if Dirmngr is able to retrieve
the CA's certificate directly by its own means. In general it
is better to use gpgsm's --call-dirmngr loadcrl filename command
so that gpgsm can help dirmngr.
--fetch-crl url
This command requires an URL as additional argument, and it will
make dirmngr try to retrieve and import the CRL from that url
into it's cache. This is mainly useful for debugging purposes.
The dirmngr-client provides the same feature for a running dirm-
ngr.
--shutdown
This commands shuts down an running instance of Dirmngr. This
command has currently no effect.
--flush
This command removes all CRLs from Dirmngr's cache. Client re-
quests will thus trigger reading of fresh CRLs.
OPTIONS
Note that all long options with the exception of --options and --home-
dir may also be given in the configuration file after stripping off the
two leading dashes.
--options file
Reads configuration from file instead of from the default per-
user configuration file. The default configuration file is
named 'dirmngr.conf' and expected in the home directory.
--homedir dir
Set the name of the home directory to dir. This option is only
effective when used on the command line. The default is the di-
rectory named '.gnupg' directly below the home directory of the
user unless the environment variable GNUPGHOME has been set in
which case its value will be used. Many kinds of data are
stored within this directory.
-v
--verbose
Outputs additional information while running. You can increase
the verbosity by giving several verbose commands to dirmngr,
such as -vv.
--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.
--debug-level level
Select the debug level for investigating problems. level may be
a numeric value or by 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
specified and may change with newer releases of this program. They are
however carefully selected to best aid in debugging.
--debug flags
Set debugging flags. This option is only useful for debugging
and its behavior may change with a new release. All flags are
or-ed and 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.
--debug-all
Same as --debug=0xffffffff
--tls-debug level
Enable debugging of the TLS layer at level. The details of the
debug level depend on the used TLS library and are not set in
stone.
--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
attach a debugger.
--disable-check-own-socket
On some platforms dirmngr is able to detect the removal of its
socket file and shutdown itself. This option disable this self-
test for debugging purposes.
-s
--sh
-c
--csh Format the info output in daemon mode for use with the standard
Bourne shell respective the C-shell. The default is to guess it
based on the environment variable SHELL which is in almost all
cases sufficient.
--force
Enabling this option forces loading of expired CRLs; this is
only useful for debugging.
--use-tor
--no-use-tor
The option --use-tor switches Dirmngr and thus GnuPG into ``Tor
mode'' to route all network access via Tor (an anonymity net-
work). Certain other features are disabled in this mode. The
effect of --use-tor cannot be overridden by any other command or
even by reloading dirmngr. The use of --no-use-tor disables the
use of Tor. The default is to use Tor if it is available on
startup or after reloading dirmngr.
--standard-resolver
This option forces the use of the system's standard DNS resolver
code. This is mainly used for debugging. Note that on Windows
a standard resolver is not used and all DNS access will return
the error ``Not Implemented'' if this option is used. Using
this together with enabled Tor mode returns the error ``Not En-
abled''.
--recursive-resolver
When possible use a recursive resolver instead of a stub re-
solver.
--resolver-timeout n
Set the timeout for the DNS resolver to N seconds. The default
are 30 seconds.
--connect-timeout n
--connect-quick-timeout n
Set the timeout for HTTP and generic TCP connection attempts to
N seconds. The value set with the quick variant is used when
the --quick option has been given to certain Assuan commands.
The quick value is capped at the value of the regular connect
timeout. The default values are 15 and 2 seconds. Note that
the timeout values are for each connection attempt; the connec-
tion code will attempt to connect all addresses listed for a
server.
--listen-backlog n
Set the size of the queue for pending connections. The default
is 64.
--allow-version-check
Allow Dirmngr to connect to https://versions.gnupg.org to get
the list of current software versions. On debian-packaged ver-
sions, this option does nothing since software updates should be
handled by the distribution. See the option --query-swdb of the
command gpgconf for more details. Note, that regardless of this
option a version check can always be triggered using this com-
mand:
gpg-connect-agent --dirmngr 'loadswdb --force' /bye
--keyserver name
Use name as your keyserver. This is the server that gpg commu-
nicates with to receive keys, send keys, and search for keys.
The format of the name is a URI: `scheme:[//]keyserver-
name[:port]' The scheme is the type of keyserver: "hkp" for the
HTTP (or compatible) keyservers, "ldap" for the LDAP keyservers,
or "mailto" for the Graff email keyserver. Note that your par-
ticular installation of GnuPG may have other keyserver types
available as well. Keyserver schemes are case-insensitive. After
the keyserver name, optional keyserver configuration options may
be provided. These are the same as the --keyserver-options of
gpg, but apply only to this particular keyserver.
Most keyservers synchronize with each other, so there is gener-
ally no need to send keys to more than one server. The keyserver
hkp://keys.gnupg.net uses round robin DNS to give a different
keyserver each time you use it.
If exactly two keyservers are configured and only one is a Tor
hidden service (.onion), Dirmngr selects the keyserver to use
depending on whether Tor is locally running or not. The check
for a running Tor is done for each new connection.
If no keyserver is explicitly configured, dirmngr will use the
built-in default of hkps://keys.openpgp.org.
Note that the above default is a Debian-specific choice. Up-
stream GnuPG prefers hkps://hkps.pool.sks-keyservers.net. See
/usr/share/doc/gpgconf/NEWS.Debian.gz for more details.
--nameserver ipaddr
In ``Tor mode'' Dirmngr uses a public resolver via Tor to re-
solve DNS names. If the default public resolver, which is
8.8.8.8, shall not be used a different one can be given using
this option. Note that a numerical IP address must be given
(IPv6 or IPv4) and that no error checking is done for ipaddr.
--disable-ipv4
--disable-ipv6
Disable the use of all IPv4 or IPv6 addresses.
--disable-ldap
Entirely disables the use of LDAP.
--disable-http
Entirely disables the use of HTTP.
--ignore-http-dp
When looking for the location of a CRL, the to be tested cer-
tificate usually contains so called CRL Distribution Point (DP)
entries which are URLs describing the way to access the CRL.
The first found DP entry is used. With this option all entries
using the HTTP scheme are ignored when looking for a suitable
DP.
--ignore-ldap-dp
This is similar to --ignore-http-dp but ignores entries using
the LDAP scheme. Both options may be combined resulting in ig-
noring DPs entirely.
--ignore-ocsp-service-url
Ignore all OCSP URLs contained in the certificate. The effect
is to force the use of the default responder.
--honor-http-proxy
If the environment variable 'http_proxy' has been set, use its
value to access HTTP servers.
--http-proxy host[:port]
Use host and port to access HTTP servers. The use of this op-
tion overrides the environment variable 'http_proxy' regardless
whether --honor-http-proxy has been set.
--ldap-proxy host[:port]
Use host and port to connect to LDAP servers. If port is omit-
ted, port 389 (standard LDAP port) is used. This overrides any
specified host and port part in a LDAP URL and will also be used
if host and port have been omitted from the URL.
--only-ldap-proxy
Never use anything else but the LDAP "proxy" as configured with
--ldap-proxy. Usually dirmngr tries to use other configured
LDAP server if the connection using the "proxy" failed.
--ldapserverlist-file file
Read the list of LDAP servers to consult for CRLs and certifi-
cates from file instead of the default per-user ldap server list
file. The default value for file is 'dirmngr_ldapservers.conf'.
This server list file contains one LDAP server per line in the
format
hostname:port:username:password:base_dn
Lines starting with a '#' are comments.
Note that as usual all strings entered are expected to be UTF-8
encoded. Obviously this will lead to problems if the password
has originally been encoded as Latin-1. There is no other solu-
tion here than to put such a password in the binary encoding
into the file (i.e. non-ascii characters won't show up read-
able). ([The gpgconf tool might be helpful for frontends as it
enables editing this configuration file using percent-escaped
strings.])
--ldaptimeout secs
Specify the number of seconds to wait for an LDAP query before
timing out. The default are 15 seconds. 0 will never timeout.
--add-servers
This option makes dirmngr add any servers it discovers when val-
idating certificates against CRLs to the internal list of
servers to consult for certificates and CRLs.
This option is useful when trying to validate a certificate that
has a CRL distribution point that points to a server that is not
already listed in the ldapserverlist. Dirmngr will always go to
this server and try to download the CRL, but chances are high
that the certificate used to sign the CRL is located on the same
server. So if dirmngr doesn't add that new server to list, it
will often not be able to verify the signature of the CRL unless
the --add-servers option is used.
Note: The current version of dirmngr has this option disabled by
default.
--allow-ocsp
This option enables OCSP support if requested by the client.
OCSP requests are rejected by default because they may violate
the privacy of the user; for example it is possible to track the
time when a user is reading a mail.
--ocsp-responder url
Use url as the default OCSP Responder if the certificate does
not contain information about an assigned responder. Note, that
--ocsp-signer must also be set to a valid certificate.
--ocsp-signer fpr|file
Use the certificate with the fingerprint fpr to check the re-
sponses of the default OCSP Responder. Alternatively a filename
can be given in which case the response is expected to be signed
by one of the certificates described in that file. Any argument
which contains a slash, dot or tilde is considered a filename.
Usual filename expansion takes place: A tilde at the start fol-
lowed by a slash is replaced by the content of 'HOME', no slash
at start describes a relative filename which will be searched at
the home directory. To make sure that the file is searched in
the home directory, either prepend the name with "./" or use a
name which contains a dot.
If a response has been signed by a certificate described by
these fingerprints no further check upon the validity of this
certificate is done.
The format of the FILE is a list of SHA-1 fingerprint, one per
line with optional colons between the bytes. Empty lines and
lines prefix with a hash mark are ignored.
--ocsp-max-clock-skew n
The number of seconds a skew between the OCSP responder and them
local clock is accepted. Default is 600 (10 minutes).
--ocsp-max-period n
Seconds a response is at maximum considered valid after the time
given in the thisUpdate field. Default is 7776000 (90 days).
--ocsp-current-period n
The number of seconds an OCSP response is considered valid after
the time given in the NEXT_UPDATE datum. Default is 10800 (3
hours).
--max-replies n
Do not return more that n items in one query. The default is
10.
--ignore-cert-extension oid
Add oid to the list of ignored certificate extensions. The oid
is expected to be in dotted decimal form, like 2.5.29.3. This
option may be used more than once. Critical flagged certificate
extensions matching one of the OIDs in the list are treated as
if they are actually handled and thus the certificate won't be
rejected due to an unknown critical extension. Use this option
with care because extensions are usually flagged as critical for
a reason.
--hkp-cacert file
Use the root certificates in file for verification of the TLS
certificates used with hkps (keyserver access over TLS). If the
file is in PEM format a suffix of .pem is expected for file.
This option may be given multiple times to add more root cer-
tificates. Tilde expansion is supported.
If no hkp-cacert directive is present, dirmngr will make a rea-
sonable choice: if the keyserver in question is the special pool
hkps.pool.sks-keyservers.net, it will use the bundled root cer-
tificate for that pool. Otherwise, it will use the system CAs.
EXAMPLES
Here is an example on how to show dirmngr's internal table of OpenPGP
keyserver addresses. The output is intended for debugging purposes and
not part of a defined API.
gpg-connect-agent --dirmngr 'keyserver --hosttable' /bye
To inhibit the use of a particular host you have noticed in one of the
keyserver pools, you may use
gpg-connect-agent --dirmngr 'keyserver --dead pgpkeys.bnd.de' /bye
The description of the keyserver command can be printed using
gpg-connect-agent --dirmngr 'help keyserver' /bye
FILES
Dirmngr makes use of several directories when running in daemon mode:
There are a few configuration files whih control the operation of dirm-
ngr. By default they may all be found in the current home directory
(see: [option --homedir]).
dirmngr.conf
This is the standard configuration file read by dirmngr on
startup. It may contain any valid long option; the leading two
dashes may not be entered and the option may not be abbreviated.
This file is also read after a SIGHUP however not all options
will actually have an effect. This default name may be changed
on the command line (see: [option --options]). You should
backup this file.
/etc/gnupg/trusted-certs
This directory should be filled with certificates of Root CAs
you are trusting in checking the CRLs and signing OCSP Re-
sponses.
Usually these are the same certificates you use with the appli-
cations making use of dirmngr. It is expected that each of
these certificate files contain exactly one DER encoded certifi-
cate in a file with the suffix '.crt' or '.der'. dirmngr reads
those certificates on startup and when given a SIGHUP. Certifi-
cates which are not readable or do not make up a proper X.509
certificate are ignored; see the log file for details.
Applications using dirmngr (e.g. gpgsm) can request these cer-
tificates to complete a trust chain in the same way as with the
extra-certs directory (see below).
Note that for OCSP responses the certificate specified using the
option --ocsp-signer is always considered valid to sign OCSP re-
quests.
/etc/gnupg/extra-certs
This directory may contain extra certificates which are pre-
loaded into the internal cache on startup. Applications using
dirmngr (e.g. gpgsm) can request cached certificates to complete
a trust chain. This is convenient in cases you have a couple
intermediate CA certificates or certificates usually used to
sign OCSP responses. These certificates are first tried before
going out to the net to look for them. These certificates must
also be DER encoded and suffixed with '.crt' or '.der'.
~/.gnupg/crls.d
This directory is used to store cached CRLs. The 'crls.d' part
will be created by dirmngr if it does not exists but you need to
make sure that the upper directory exists.
SIGNALS
A running dirmngr 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 internally cached CRLs as well as any
cached certificates. Then the certificate cache is reinitial-
ized as on startup. Options are re-read from the configuration
file. Instead of sending this signal it is better to use
gpgconf --reload dirmngr
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. You may also
use
gpgconf --kill dirmngr
instead of this signal
SIGINT Shuts down the process immediately.
SIGUSR1
This prints some caching statistics to the log file.
SEE ALSO
gpgsm(1), dirmngr-client(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 struc-
ture and an index.
GnuPG 2.2.20 2020-03-18 DIRMNGR(8)