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Wiki source code of KerberosAndLDAP

Version 11.1 by Sirius Rayner-Karlsson on 2024/05/01 17:06

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Sirius Rayner-Karlsson 1.1 1 = Debian =
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Sirius Rayner-Karlsson 2.1 3 The guide I followed was [[https:~~/~~/wiki.debian.org/LDAP/OpenLDAPSetup#Kerberos>>https://wiki.debian.org/LDAP/OpenLDAPSetup#Kerberos]] which while it worked required some minor tweaks. I obtained edit privileges for the Debian Wiki and updated the guide with the fixes that I found. I however have a Synology NAS and that can run an LDAP Server. So this guide differs a little from the upstream Debian Guide.
Sirius Rayner-Karlsson 1.1 4
Sirius Rayner-Karlsson 3.1 5 First, install the packages containing the LDAP-enabled Kerberos servers ([[krb5-kdc-ldap>>url:https://packages.debian.org/krb5-kdc-ldap]] and [[krb5-admin-server>>url:https://packages.debian.org/krb5-admin-server]]) and the [[schema2ldif>>url:https://packages.debian.org/schema2ldif]] tool:
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Sirius Rayner-Karlsson 11.1 7 '''
8 $ sudo apt install krb5-kdc-ldap krb5-admin-server schema2ldif
9 '''
Sirius Rayner-Karlsson 3.1 10
11 Then load the ##kerberos## schema:
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Sirius Rayner-Karlsson 11.1 13 '''
14 $ zcat /usr/share/doc/krb5-kdc-ldap/kerberos.openldap.ldif.gz | ldapadd -H ldap:~/~/nas.fqdn/ -D uid=root,cn=users,dc=example,dc=com
15 Password:
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Sirius Rayner-Karlsson 11.1 17 adding new entry "cn=kerberos,cn=schema,cn=config"
18 '''
Sirius Rayner-Karlsson 4.1 19
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Sirius Rayner-Karlsson 11.1 21
Sirius Rayner-Karlsson 3.1 22 And add an index on the ##krbPrincipalName## (improves performance and also suppresses some log messages if ##slapd## is configured to log more than default) for the database(s) where you intend to store Kerberos data:
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Sirius Rayner-Karlsson 6.1 24 {{{# ldapmodify -H ldap:~/~/nas.fqhn <<EOF
Sirius Rayner-Karlsson 3.1 25
Sirius Rayner-Karlsson 4.1 26 dn: olcDatabase={1}bdb,cn=config
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Sirius Rayner-Karlsson 3.1 28 add: olcDbIndex
Sirius Rayner-Karlsson 4.1 29
Sirius Rayner-Karlsson 3.1 30 olcDbIndex: krbPrincipalName eq,pres,sub
Sirius Rayner-Karlsson 4.1 31
Sirius Rayner-Karlsson 3.1 32 EOF
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Sirius Rayner-Karlsson 4.1 34 modifying entry "olcDatabase={1}bdb,cn=config"
Sirius Rayner-Karlsson 3.1 35
Sirius Rayner-Karlsson 4.1 36 }}}
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Sirius Rayner-Karlsson 3.1 39 Next, you need to create and configure two entries which will be used by the Kerberos servers to connect to OpenLDAP. If you are running Kerberos and OpenLDAP on the same system, these steps are optional, but recommended. In order to keep things nicely separated, everything will be created under a separate ##organizationalUnit##. Note that a simple bind (##-x -D##) is used instead of an ##EXTERNAL## bind since write access to the dc=example,dc=com DIT is necessary:
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Sirius Rayner-Karlsson 6.1 42 {{{# ldapadd -x -D cn=admin,dc=example,dc=com -W <<EOF
Sirius Rayner-Karlsson 3.1 43 dn: ou=Services,dc=example,dc=com
44 objectClass: organizationalUnit
45 objectClass: top
46 ou: Services
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48 dn: ou=kerberos,ou=Services,dc=example,dc=com
49 objectClass: organizationalUnit
50 objectClass: top
51 ou: kerberos
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53 dn: uid=kdc,ou=kerberos,ou=Services,dc=example,dc=com
54 uid: kdc
55 objectClass: account
56 objectClass: simpleSecurityObject
57 userPassword: {CRYPT}x
58 description: Kerberos KDC Account
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60 dn: uid=kadmin,ou=kerberos,ou=Services,dc=example,dc=com
61 uid: kadmin
62 objectClass: account
63 objectClass: simpleSecurityObject
64 userPassword: {CRYPT}x
65 description: Kerberos Admin Server Account
66 EOF
67 Enter LDAP Password: SECRET
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69 adding new entry "ou=Services,dc=example,dc=com"
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71 adding new entry "ou=kerberos,ou=Services,dc=example,dc=com"
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73 adding new entry "uid=kdc,ou=kerberos,ou=Services,dc=example,dc=com"
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75 adding new entry "uid=kadmin,ou=kerberos,ou=Services,dc=example,dc=com"}}}
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