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3.3 Configuration

Dirmngr makes use of several directories when running in daemon mode: There are a few configuration files whih control the operation of dirmngr. 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 Responses.

Usually these are the same certificates you use with the applications making use of dirmngr. It is expected that each of these certificate files contain exactly one DER encoded certificate in a file with the suffix .crt or .der. dirmngr reads those certificates on startup and when given a SIGHUP. Certificates 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 certificates 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 requests.

/etc/gnupg/extra-certs
This directory may contain extra certificates which are preloaded 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.

To be able to see what's going on you should create the configure file ~/gnupg/dirmngr.conf with at least one line:

     log-file ~/dirmngr.log

To be able to perform OCSP requests you probably want to add the line:

     allow-ocsp

To make sure that new options are read and that after the installation of a new GnuPG versions the installed dirmngr is running, you may want to kill an existing dirmngr first:

     gpgconf --kill dirmngr

You may check the log file to see whether all desired root certificates have been loaded correctly.