doc: Add notes on how to setup LDAP

--

.gitignore

@@ -162,3 +162,6 @@ x.parm
 /VERSION
 /swdb.lst
 /swdb.lst.sig
+/doc/ldap/gnupg-and-ldap.pdf
+/doc/ldap/gnupg-and-ldap.tex
+/doc/ldap/gnupg-and-ldap.txt

doc/ldap/README.ldap

@@ -0,0 +1,445 @@
+# README.ldap                                             -*- org -*-
+#+TITLE: How to use LDAP with GnuPG
+#+AUTHOR:    GnuPG.com
+#+DATE:      2020-10-07
+#
+# The following comment lines are for use by Org-mode.
+#+EXPORT_FILE_NAME: gnupg-and-ldap
+#+LANGUAGE:  en
+#+OPTIONS:   H:3 num:t toc:t \n:nil @:t ::t |:t ^:{} -:t f:t *:t TeX:t LaTeX:t skip:nil d:(HIDE) tags:not-in-toc
+#+HTML_HEAD: <link rel="stylesheet" type="text/css" href="https://gnupg.org/share/site.css" />
+#+LATEX_CLASS: article
+#+LATEX_CLASS_OPTIONS: [a4paper,11pt]
+#+LATEX_HEADER: \usepackage{a4wide}
+#+LATEX_HEADER_EXTRA: \parindent0mm
+#+STARTUP: showall
+
+* How to use LDAP with GnuPG
+
+In GnuPG the handling of LDAP is done by its Dirmngr component.  This
+is due to the architecture of the system where Dirmngr is the sole
+process responsible for network related tasks.  Network access is
+required for:
+
+  - CRL fetching and caching for S/MIME
+  - OCSP checking
+  - S/MIME (X.509) certificate search via LDAP
+  - OpenPGP keyserver access (HTTP, LDAP, etc.)
+  - Checking for software updates (if enabled)
+
+In the following we describe how S/MIME and OpenPGP certificate search
+is implemented.  If you want to skip this background information feel
+free to continue with the next section where LDAP installation and
+configuration is described.  In any case we need to explain a few
+terms used with LDAP:
+
+- DIT :: /Directory Information Tree/ also known as /naming context/.
+         This is is often referred to as the /LDAP directory/.  It is
+         where the data for a single organization described by a DNS
+         name is stored (e.g. "example.org").
+- DN :: /Distinguished Name/ is the key for an entry in the DIT.  It
+        is a similar concept as used in the DNS system.
+- RDN :: /Relative Distinguished Name/ is a component or part of a
+         DN.  For example the DN "cn=admin,dc=example,dc=com" consist
+         of the 3 RDNs "cn=admin", "dc=example", and "dc=com".  Each
+         RDN has a name (e.g. "cn" for /common name/ or "dc" for
+         /domain component/) and a values (e.g. "admin").
+- LDIF :: /LDAP Data Interchange Format/ is a description for the
+          human readable data exchange format used with LDAP.
+
+
+
+** OpenPGP
+
+To serve OpenPGP certificates via LDAP a dedicated schema needs to be
+installed.  The schema supported by GnuPG was originally defined by
+PGP Inc. in the end of the 1990ies.  This is today still the schema
+installed on LDAP servers for access by PGP or GnuPG.  However, this
+schema has a couple of deficits which need to be fixed.  For that
+reason we have defined additional attributes.  These new attributes
+eventually allow to lookup certificates by their fingerprints and not
+just by the shorter and thus non-unique Key-ID.  The new schema also
+supports storing of information on the subkeys and the UTF-8 encoded
+mail addresses.  Current versions of GnuPG do not yet make use of
+these new attributes but for new LDAP installations it is highly
+recommended to use the new schema so that a future version of the
+software can make use if these attributes.
+
+Note that the OpenPGP certificates are stored in the DIT under a
+separate organizational unit using the long Key-ID to distinguish
+them.  An example for such an DN is:
+
+: pgpCertID=63113AE866587D0A,ou=GnuPG Keys,dc=example,dc=com
+
+This design means that entries stored under "GnuPG Keys" are not
+connected to the users commonly found on an LDAP server.  This allows
+to store arbitrary OpenPGP certificates in the directory and is
+commonly used to make the certificates of external communication
+partners easily available.
+
+
+** S/MIME
+
+Standard X.509 LDAP semantics apply for S/MIME certificate search.
+The current version of Dirmngr (2.2.23) supports 3 pattern formats
+which are translated from GnuPG's User-ID syntax, as given to the gpg
+and gpgsm commands, to the LDAP syntax:
+
+- Mail :: Indicated by a leading left angle and translated to the
+          query:
+          : "<ADDRSPEC>" -> "mail=ADDRSPEC"
+
+- Subject DN :: Indicated by a leading slash.  The DN is formatted
+                according to RFC-2253 rules and thus directly usable
+                for an LDAP query.
+
+- Substring search :: If no other syntax matches or the pattern is
+     prefixed with an asterisk the User-ID is translated to:
+     : "USERID" -> "(|(sn=*USERID*)(|(cn=*USERID*)(mail=*USERID*)))"
+     or in other word a substring search on the serial-number, the
+     common-name, and the mail attribute is done.
+
+The result is expected to be in one of the attributes
+"userCertificate", "cACertificate", or "x509caCert".  In cases where
+we are looking for the issuer certificate only "cACertificate" is
+used.  "ObjectClass=*" is always used a filter.
+
+Note: The attribute "mail" with the OID 0.9.2342.19200300.100.1.3 was
+originally defined with this OID under the name "rfc822Mailbox" using
+a different although similar syntax.  Take care: This is not an UTF-8
+encoded mail address and in theory GnuPG should use IDN mapping here.
+However, it is questionable whether any real world installation
+would be able to handle such a mapping.
+
+
+* How to install OpenLDAP
+
+To install a standard LDAP server to provide S/MIME certificate lookup
+follow the instructions of your OS vendor.  For example on Debian
+based systems this is:
+
+: apt-get install slapd ldap-utils libsasl2-modules
+
+Follow the prompts during installation, set an initial admin password,
+and, most important, the domain you want to serve.  Note that we use
+"example.com" in following.  If you ever need to change the
+configuration on a Debian based system you can do so by running
+
+: dpkg-reconfigure slapd
+
+Serving LDAP requests for S/MIME (X.509) certificates will then work
+out of the box.  Use your standard tools to maintain these
+entries. Some hints on how to manually add certificates can be found
+below in the section "Useful LDAP Commands".
+
+Please read on if you want to serve also OpenPGP certificates.
+
+** Installation of the OpenPGP Schema
+
+Assuming a standard OpenLDAP installation, it is easy to add a new
+schema to store OpenPGP certificate.  We describe this now step by
+step.
+
+First you need to download the two LDIF files
+- https://gnupg.org/misc/gnupg-ldap-schema.ldif
+- https://gnupg.org/misc/gnupg-ldap-init.ldif.
+
+
+As administrator (root) on your LDAP server use the command
+
+: ldapadd -v -Y EXTERNAL -H ldapi:/// -f ./gnupg-ldap-schema.ldif
+
+to install the schema.  The options given to the ldapadd tool are:
+
+ - -v :: Given some diagnostic output (be verbose).  To be even more
+         verbose you may use =-vv= or =-vvv=.  The diagnostics are
+         written to stdout.
+ - -Y :: Specify the authentication mechanism.  Here we use =EXTERN=
+         which is in this case local socket based authentication
+         (ldapi).
+ - -H :: The URL to access the LDAP server.  Only scheme, host, and
+         port are allowed.  In our case we use =ldapi:///= to request
+         a connection on the standard OpenLDAP socket (usually this is
+         =/var/run/slapd/ldapi=).
+ - -f :: Specify a file with data to add to the directory.  The file
+         used here is the specification of the keyserver schema.  If
+         this option is not used ldapadd expects this data on stdin.
+
+The new schema should now be installed. Check this by using this
+command:
+
+: ldapsearch -Q -Y EXTERNAL -L -H ldapi:/// \
+:    -b 'cn=schema,cn=config' cn | grep cn:
+(on Unix the backslash indicates that the line is continued with the
+next line)
+
+The options not used by ldapsearch which have not yet been explained
+above are:
+
+ - -Q :: Be quiet about authentication and never prompt.
+ - -b :: Specify the search base.  In this case we want the internal
+         OpenLDAP schema which stores the server's own configuration.
+
+The final argument =cn= restricts the output to the DN and the CN
+attribute; the grep then shows only the latter.  With a freshly
+installed OpenLDAP system you should get an output like:
+
+#+begin_example
+cn: schema
+cn: {0}core
+cn: {1}cosine
+cn: {2}nis
+cn: {3}inetorgperson
+cn: {4}gnupg-keyserver
+#+end_example
+
+This tells you that the keyserver schema has been installed under (in
+this case) the index "{4}".
+
+The next step is to connect the new schema with your DIT.  This means
+that entries to actually store the certificates and meta data are
+created.  This way GnuPG will be able to find the data.  For this you
+need to edit the downloaded file =gnupg-ldap-init.ldif= and replace
+all the RDNs with name "dc" with your own.  For example, in our own
+LDAP we would change
+: dn: cn=PGPServerInfo,dc=example,dc=com
+to
+: dn: cn=PGPServerInfo,dc=gnupg,dc=com
+and do that also for the other 3 appearances of the "dc" RDNs.  In case
+you use a 3-level domain, add another "dc" in the same way you did when
+setting up OpenLDAP.  With that modified file run
+
+: ldapadd -v -x -H ldapi:/// -D 'cn=admin,dc=example,dc=com' \
+:   -W -f ./gnupg-ldap-init.ldif
+
+Remember to change the "dc" RDNs also here to what you actually use.
+We use simple authentication by means of these options:
+
+ - -x :: Use simple authentication
+ - -D :: The Bind-DN used to bind to the LDAP directory
+ - -W :: Ask for the admin's passphrase.  You may also use a lowercase
+         =-w= followed by the passphrase but that would reveal the
+         passphrase in the shell's history etc.
+
+All users with access right to the LDAP server may now retrieve
+OpenPGP certificates.  But wait, we also need a user allowed to insert
+or update OpenPGP certificates.  Choose a useful name for that user
+and create a file =newuser.ldif=.  In our example domain we name that
+user "LordPrivySeal" and thus the file is:
+
+#+begin_src
+dn: uid=LordPrivySeal,ou=GnuPG Users,dc=example,dc=com
+objectClass: inetOrgPerson
+objectClass: uidObject
+sn: Lord Keeper of the Privy Seal
+cn: Lord Privy Seal
+userPassword: {SSHA}u6oxl9ulaS57RPyjApyPcE7mNECNK1Tg
+#+end_src
+
+The =userPassword= has been created by running
+: /usr/sbin/slappasswd
+entering the password, and paste the output into the file (the
+password used in the above example is "abc").
+
+Now run
+
+: ldapadd -v -x -H ldapi:/// -D 'cn=admin,dc=gnupg,dc=com' \
+:    -W -f ./newuser.ldif
+
+On the password prompt enter the admin's password (not the one of the
+new user).  Note that the user is created below the "GnuPG Users"
+organizational unit and not in the standard name space.  Thus this is
+a dedicated user for OpenPGP certificates.
+
+See below how you can list the entire DIT.  With
+a fresh install you should see these DNs:
+#+begin_example
+dn: dc=example,dc=com
+dn: cn=admin,dc=example,dc=com
+dn: cn=PGPServerInfo,dc=example,dc=com
+dn: ou=GnuPG Keys,dc=example,dc=com
+dn: ou=GnuPG Users,dc=example,dc=com
+dn: uid=LordPrivySeal,ou=GnuPG Users,dc=example,dc=com
+#+end_example
+
+Finally we need to give all users read access to the server's database
+and allow an authenticated user to modify the database.  To do this
+you need to figure out the used database; run the command
+
+: ldapsearch -Q -Y EXTERNAL -H ldapi:/// -b 'cn=config' dn | grep olcDatabase=
+
+which should give you a list like this:
+
+#+begin_example
+dn: olcDatabase={-1}frontend,cn=config
+dn: olcDatabase={0}config,cn=config
+dn: olcDatabase={1}mdb,cn=config
+#+end_example
+
+The first two databases are for internal purposes, the last one is our
+database.  Now create a file =grantaccess.ldif= with this content:
+
+#+begin_example
+dn: olcDatabase={1}mdb,cn=config
+changetype: modify
+replace: olcAccess
+olcAccess: {0} to dn.subtree="dc=example,dc=com"
+    by dn.regex="^uid=LordPrivySeal,ou=GnuPG Users,dc=example,dc=com" write
+    by * read
+#+end_example
+
+As usual replace all "dc=example,dc=com" accordingly.  Take care not
+to insert a blank line anywhere.  The first line needs to give the DN
+of the database as determined above.  Excute the rules from that file
+using the command:
+
+: ldapmodify -Q -Y EXTERNAL -H ldapi:/// -f grantaccess.ldif
+
+Now all users have read access and the user LordPrivySeal has write
+access.  In case you want to give several users  permissions to update the
+keys replace the regex line in =grantaccess.ldif= with
+
+:  by dn.regex="^uid=([^,]+),ou=GnuPG Users,dc=example,dc=com" write
+
+and create those users below the RDN "ou=GnuPG Users".
+
+That's all you need to do at the server.
+
+** Configuration for GnuPG
+
+The easiest way to enable LDAP for S/MIME is to put
+
+#+begin_src
+keyserver ldap.example.com::::dc=example,dc=com:
+#+end_src
+
+into =gpgsm.conf=.  If you prefer to use a  dedicated configuration
+file you can do this with dirmngr by adding a line
+
+: ldap.example.com::::dc=example,dc=com:
+
+to =dirmngr_ldapservers.conf=.
+
+Assuming you want to use the machine running the LDAP server also to
+maintain OpenPGP certificates, put the following line into the
+=dirmngr.conf= configuration of a dedicated user for this task:
+
+#+begin_src
+keyserver ldapi:///????bindname=uid=LordPrivySeal
+%2Cou=GnuPG%20Users%2Cdc=example%2Cdc=com,password=abc
+#+end_src
+(Enter this all on one line; "%2C" directly at the end of "Seal")
+
+That is a pretty long line with weird escaping rules.  Just enter it
+verbatim but replace the "dc" RDNs accordingly. Remember that =ldapi=
+uses local socket connection instead of TCP to connect to the server.
+The password given in that file is the password of the OpenPGP
+maintainer (LordPrivySeal).  Use appropriate permissions for that
+file to make it not too easy to access that password.  See the GnuPG
+manual for other ways to configure an LDAP keyserver.
+
+With that configuration in place you may add arbitrary OpenPGP keys to
+your LDAP.  For example user "joe@example.org" sends you a key and
+asks to insert that key.  If you feel comfortable with that you should
+first check the key, import it into your local keyring, and then send
+it off to your LDAP server:
+
+: gpg --show-key < file-with-joes-key.asc
+
+Looks good?  Note the fingerprint of the key and run
+
+: gpg --import < file-with-joes-key.asc
+: gpg --send-keys FINGERPRINT
+
+That's all.  If you want to work from a different machine or use the
+Kleopatra GUI you need to make sure that ldaps has been correctly
+configured (for example on the machine =ldap.example.org=) and you
+need to use this keyserver line:
+#+begin_src
+keyserver ldaps://ldap.example.com/????bindname=uid=LordPrivySeal
+%2Cou=GnuPG%20Users%2Cdc=example%2Cdc=com,password=abc
+#+end_src
+(Enter this all on one line; "%2C" directly at the end of "Seal")
+
+The easier case is the configuration line for anonymous users which is
+a mere
+#+begin_src
+keyserver ldaps://ldap.example.com
+#+end_src
+
+This assumes that you have a valid TLS server certificate for that
+domain and ldaps is enabled on the server.
+
+* Useful LDAP Commands
+
+** List the entire DIT
+
+To list the entire DIT for the domain "example.com" use this command:
+
+: ldapsearch -Q -Y EXTERNAL -LLL -H ldapi:/// -b dc=example,dc=com dn
+
+This lists just the DNs.  If you need the entire content of the DIT
+leave our the "dn" argument.  The option "-LLL" selects a useful
+formatting options for the output.
+
+** Insert X.509 Certficate
+
+If you don't have a handy tool to insert a certificate via LDAP you
+can do it manually.  First put the certificate in binary (DER) format
+into a file.  For example using gpgsm:
+
+: gpgsm --export berta.boss@example.com >berta.crt
+
+Then create a file =addcert.ldif=:
+#+begin_example
+dn: CN=Berta Boss,dc=example,dc=com
+objectclass: inetOrgPerson
+cn: Berta Boss
+sn: Boss
+gn: Berta
+uid: berta
+mail: berta.boss@example.com
+usercertificate;binary:< file:///home/admin/berta.crt
+#+end_example
+(Note that an absolute file name is required.)
+
+Finally run
+
+: ldapadd -x -H ldapi:/// -D 'cn=admin,dc=example,dc=com' -W -f adduser.ldif
+
+
+** Change RootDN Password:
+
+Create temporary file named =passwd.ldif=:
+#+begin_src
+dn: olcDatabase={1}mdb,cn=config
+changetype: modify
+replace: olcRootPW
+olcRootPW: XXXX
+#+end_src
+
+For XXXX insert the output of slappasswd and run
+: ldapmodify -Q -Y EXTERNAL -H ldapi:/// -f passwd.ldif
+
+followed by
+
+: ldappasswd -x -D cn=admin,dc=example,dc=com -W -S
+
+and enter the new and old password again.
+
+** Show ACLs
+
+: ldapsearch -Q -Y EXTERNAL -H ldapi:/// -b 'cn=config' olcAccess
+
+** Show a list of databases
+
+: ldapsearch -Q -Y EXTERNAL -H ldapi:/// -b 'cn=config' | grep ^olcDatabase:
+
+** Change the log level
+
+To debug access problems, it is useful to change the log level:
+
+: printf "dn: cn=config\nchangetype: %s\nreplace: %s\n%s: %s\n" \
+:   modify olcLogLevel olcLogLevel ACL | ldapadd -Q -Y EXTERNAL -H ldapi:///
+
+to revert replace "ACL" by "none".

doc/ldap/gnupg-ldap-init.ldif

@@ -0,0 +1,27 @@
+# gnupg-ldap-init.ldif                                 -*- conf -*-
+#
+# Entries connecting the schema specified in gnupg-ldap-schema.ldif.
+# Revision: 2020-10-07
+
+dn: cn=PGPServerInfo,dc=example,dc=com
+objectClass: pgpServerInfo
+cn: PGPServerInfo
+# Note that we suggest the use of ou=GnuPG keys instead of the often
+# used PGP Keys.  This makes it easy to spot this is a new schema.
+pgpBaseKeySpaceDN: ou=GnuPG Keys,dc=example,dc=com
+# Using the value GnuPG here indicates that pgpVersion below has a
+# well-defined meaning.
+pgpSoftware: GnuPG
+# Currently used values:
+#  1 :: Classic PGP schema
+#  2 :: The attributes gpgFingerprint, gpgSubFingerprint,
+#       gpgSubCertID, and gpgMailbox are part of the schema.
+pgpVersion: 2
+
+dn: ou=GnuPG Keys,dc=example,dc=com
+objectClass: organizationalUnit
+ou: GnuPG Keys
+
+dn: ou=GnuPG Users,dc=example,dc=com
+objectclass: organizationalUnit
+ou: GnuPG Users

doc/ldap/gnupg-ldap-schema.ldif

@@ -0,0 +1,209 @@
+# gnupg-ldap-scheme.ldif                                 -*- conf -*-
+#
+# Schema for an OpenPGP LDAP keyserver.  This is a slighly enhanced
+# version of the original LDAP schema used for PGP keyservers as
+# installed at quite some sites.
+# Revision: 2020-10-07
+
+# Note: The index 1000 is just a high number so that OpenLDAP assigns
+# the next available number.
+dn: cn={1000}gnupg-keyserver,cn=schema,cn=config
+objectClass: olcSchemaConfig
+# The base DN for the PGP key space by querying the
+#  pgpBaseKeySpaceDN attribute (This is normally
+#  'ou=PGP Keys,dc=example,dc=com').
+olcAttributeTypes: {0}(
+    1.3.6.1.4.1.3401.8.2.8
+    NAME 'pgpBaseKeySpaceDN'
+    DESC 'Points to DN of the object that will store the PGP keys.'
+    SYNTAX 1.3.6.1.4.1.1466.115.121.1.12
+    SINGLE-VALUE )
+# See gnupg-ldap-init.ldif for a description of the next two attributes
+olcAttributeTypes: {1}(
+    1.3.6.1.4.1.3401.8.2.9
+    NAME 'pgpSoftware'
+    DESC 'Origin of the schema'
+    SYNTAX 1.3.6.1.4.1.1466.115.121.1.15
+    SINGLE-VALUE )
+olcAttributeTypes: {2}(
+    1.3.6.1.4.1.3401.8.2.10
+    NAME 'pgpVersion'
+    DESC 'Version of this schema'
+    SYNTAX 1.3.6.1.4.1.1466.115.121.1.15
+    SINGLE-VALUE )
+#
+# The attribute holding the OpenPGP keyblock.
+# The legacy PGP LDAP server used pgpKeyV2 instead.
+olcAttributeTypes: {3}(
+    1.3.6.1.4.1.3401.8.2.11
+    NAME 'pgpKey'
+    DESC 'OpenPGP public key block'
+    SYNTAX 1.3.6.1.4.1.1466.115.121.1.26
+    SINGLE-VALUE )
+# The long key-ID
+olcAttributeTypes: {4}(
+    1.3.6.1.4.1.3401.8.2.12
+    NAME 'pgpCertID'
+    DESC 'OpenPGP long key id'
+    EQUALITY caseIgnoreMatch
+    SUBSTR caseIgnoreSubstringsMatch
+    SYNTAX 1.3.6.1.4.1.1466.115.121.1.15
+    SINGLE-VALUE )
+# A flag to temporary disable a keyblock
+olcAttributeTypes: {5}(
+    1.3.6.1.4.1.3401.8.2.13
+    NAME 'pgpDisabled'
+    DESC 'pgpDisabled attribute for PGP'
+    EQUALITY caseIgnoreMatch
+    SYNTAX 1.3.6.1.4.1.1466.115.121.1.15
+    SINGLE-VALUE )
+# The short key id.  This is actually not required and should thus not
+# be used by cleint software.
+olcAttributeTypes: {6}(
+    1.3.6.1.4.1.3401.8.2.14
+    NAME 'pgpKeyID'
+    DESC 'OpenPGP short key id'
+    EQUALITY caseIgnoreMatch
+    SUBSTR caseIgnoreSubstringsMatch
+    SYNTAX 1.3.6.1.4.1.1466.115.121.1.15
+    SINGLE-VALUE )
+# The algorithm of the key.  Used to be "RSA" or "DSS/DH".
+olcAttributeTypes: {7}(
+    1.3.6.1.4.1.3401.8.2.15
+    NAME 'pgpKeyType'
+    DESC 'pgpKeyType attribute for PGP'
+    EQUALITY caseIgnoreMatch
+    SUBSTR caseIgnoreSubstringsMatch
+    SYNTAX 1.3.6.1.4.1.1466.115.121.1.15
+    SINGLE-VALUE )
+# The User-ID.  GnuPG maps its user-ID classes this way:
+#     exact:   (pgpUserID=%s)
+#     substr:  (pgpUserID=*%s*)
+#     mail:    (pgpUserID=*<%s>*)
+#     mailsub: (pgpUserID=*<*%s*>*)
+#     mailend: (pgpUserID=*<*%s>*)
+olcAttributeTypes: {8}(
+    1.3.6.1.4.1.3401.8.2.16
+    NAME 'pgpUserID'
+    DESC 'User ID(s) associated with the key'
+    EQUALITY caseIgnoreMatch
+    SUBSTR caseIgnoreSubstringsMatch
+    SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
+# The creation time of the primary key.
+# Stored in ISO format: "20201231 120000"
+olcAttributeTypes: {9}(
+    1.3.6.1.4.1.3401.8.2.17
+    NAME 'pgpKeyCreateTime'
+    DESC 'Primary key creation time'
+    EQUALITY caseIgnoreMatch
+    ORDERING caseIgnoreOrderingMatch
+    SUBSTR caseIgnoreSubstringsMatch
+    SYNTAX 1.3.6.1.4.1.1466.115.121.1.15
+    SINGLE-VALUE )
+# Not used
+olcAttributeTypes: {10}(
+    1.3.6.1.4.1.3401.8.2.18
+    NAME 'pgpSignerID'
+    DESC 'pgpSignerID attribute for PGP'
+    EQUALITY caseIgnoreMatch
+    SUBSTR caseIgnoreSubstringsMatch
+    SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
+# A value of 1 indicated that the keyblock has been revoked
+olcAttributeTypes: {11}(
+    1.3.6.1.4.1.3401.8.2.19
+    NAME 'pgpRevoked'
+    DESC 'pgpRevoked attribute for PGP'
+    EQUALITY caseIgnoreMatch
+    SYNTAX 1.3.6.1.4.1.1466.115.121.1.15
+    SINGLE-VALUE )
+olcAttributeTypes: {12}(
+    1.3.6.1.4.1.3401.8.2.20
+    NAME 'pgpSubKeyID'
+    DESC 'Sub-key ID(s) of the PGP key.'
+    EQUALITY caseIgnoreMatch
+    SUBSTR caseIgnoreSubstringsMatch
+    SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
+# A hin on the keysize.
+olcAttributeTypes: {13}(
+    1.3.6.1.4.1.3401.8.2.21
+    NAME 'pgpKeySize'
+    DESC 'pgpKeySize attribute for PGP'
+    EQUALITY caseIgnoreMatch
+    ORDERING caseIgnoreOrderingMatch
+    SUBSTR caseIgnoreSubstringsMatch
+    SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
+# Expiration time of the primary key.
+# Stored in ISO format: "20201231 120000"
+olcAttributeTypes: {14}(
+    1.3.6.1.4.1.3401.8.2.22
+    NAME 'pgpKeyExpireTime'
+    DESC 'pgpKeyExpireTime attribute for PGP'
+    EQUALITY caseIgnoreMatch
+    ORDERING caseIgnoreOrderingMatch
+    SUBSTR caseIgnoreSubstringsMatch
+    SYNTAX 1.3.6.1.4.1.1466.115.121.1.15
+    SINGLE-VALUE )
+#
+# The hex encoded fingerprint of the primary key.
+olcAttributeTypes: {15}(
+    1.3.6.1.4.1.11591.2.4.1.1
+    NAME 'gpgFingerprint'
+    DESC 'Fingerprint of the primary key'
+    EQUALITY caseIgnoreMatch
+    SUBSTR caseIgnoreSubstringsMatch
+    SYNTAX 1.3.6.1.4.1.1466.115.121.1.15
+    SINGLE-VALUE )
+# A list of hex encoded fingerprints of the subkeys.
+olcAttributeTypes: {16}(
+    1.3.6.1.4.1.11591.2.4.1.2
+    NAME 'gpgSubFingerprint'
+    DESC 'Fingerprints of the secondary keys'
+    EQUALITY caseIgnoreMatch
+    SUBSTR caseIgnoreSubstringsMatch
+    SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
+# A list of utf8 encoded addr-spec used instead of mail/rfc822Mailbox
+olcAttributeTypes: {17}(
+    1.3.6.1.4.1.11591.2.4.1.3
+    NAME 'gpgMailbox'
+    DESC 'The utf8 encoded addr-spec of a mailbox'
+    EQUALITY caseIgnoreMatch
+    SUBSTR caseIgnoreSubstringsMatch
+    SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
+# A list of hex encoded long keyids of all subkeys.
+olcAttributeTypes: {18}(
+    1.3.6.1.4.1.11591.2.4.1.4
+    NAME 'gpgSubCertID'
+    DESC 'OpenPGP long subkey id'
+    EQUALITY caseIgnoreMatch
+    SUBSTR caseIgnoreSubstringsMatch
+    SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
+#
+#
+# Used by regular LDAP servers to indicate pgp support.
+#
+olcObjectClasses: {0}(
+    1.3.6.1.4.1.3401.8.2.23
+    NAME 'pgpServerInfo'
+    DESC 'An OpenPGP public keyblock store'
+    SUP top
+    STRUCTURAL MUST ( cn $ pgpBaseKeySpaceDN )
+                MAY ( pgpSoftware $ pgpVersion ) )
+#
+# The original PGP key object extended with a few extra attributes.
+# All new software should set them but this is not enforced for
+# backward compatibility
+olcObjectClasses: {1}(
+    1.3.6.1.4.1.3401.8.2.24
+    NAME 'pgpKeyInfo'
+    DESC 'An OpenPGP public keyblock'
+    SUP top
+    STRUCTURAL MUST ( pgpCertID $ pgpKey )
+                MAY ( pgpDisabled $ pgpKeyID $ pgpKeyType $
+                      pgpUserID $ pgpKeyCreateTime $ pgpSignerID $
+                      pgpRevoked $ pgpSubKeyID $ pgpKeySize $
+                      pgpKeyExpireTime $ gpgFingerprint $
+                      gpgSubFingerprint $ gpgSubCertID $
+                      gpgMailbox ) )
+#
+# end-of-file
+#