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Changes for page KerberosAndLDAP

Last modified by Sirius Rayner-Karlsson on 2024/05/09 10:54

From version 11.1
edited by Sirius Rayner-Karlsson
on 2024/05/01 17:06
Change comment: There is no comment for this version
To version 15.1
edited by Sirius Rayner-Karlsson
on 2024/05/01 17:28
Change comment: There is no comment for this version

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2 2  
3 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.
4 4  
5 +
5 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:
6 6  
7 -'''
8 -$ sudo apt install krb5-kdc-ldap krb5-admin-server schema2ldif
9 -'''
8 +##{{{$ sudo apt install krb5-kdc-ldap krb5-admin-server schema2ldif}}}##
10 10  
10 +
11 11  Then load the ##kerberos## schema:
12 12  
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:
13 +##{{{$ 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 -W}}}##
14 +##{{{Password:}}}##
15 +##{{{adding new entry "cn=kerberos,cn=schema,cn=config"}}}##
16 +##{{{$}}}##
16 16  
17 -adding new entry "cn=kerberos,cn=schema,cn=config"
18 -'''
19 19  
19 +Having an index on the ##krbPrincipalName## improves performance and also suppresses some log messages if ##slapd## is configured to log more than default for the database(s) where you intend to store Kerberos data. As this is OpenLDAP on the Synology, it does not use ##mdb## format, it uses ##bdb##:
20 20  
21 +##{{{$ sudo ldapmodify -H ldap://nas.fqhn/ -D uid=root,cn=users,dc=example,dc=com -W <<EOF}}}##
22 +##{{{dn: olcDatabase={1}bdb,cn=config}}}##
23 +##{{{add: olcDbIndex}}}##
24 +##{{{olcDbIndex: krbPrincipalName eq,pres,sub}}}##
25 +##{{{EOF}}}##
26 +##{{{Password:}}}##
27 +##{{{modifying entry "olcDatabase={1}bdb,cn=config"}}}##
28 +##{{{$}}}##
21 21  
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:
23 23  
24 -{{{# ldapmodify -H ldap:~/~/nas.fqhn <<EOF
31 +Next, you need to create and configure two entries which will be used by the Kerberos servers to connect to OpenLDAP. As you will not run the Kerberos KDC and Admin Server on the same host as OpenLDAP, these steps are required. In order to keep things nicely separated, everything will be created under a separate ##organizationalUnit##.
25 25  
26 -dn: olcDatabase={1}bdb,cn=config
33 +##{{{# ldapadd -H ldap://nas.fqhn/ -D uid=root,cn=users,dc=example,dc=com -W <<EOF}}}##
34 +##{{{dn: ou=Services,dc=example,dc=com}}}##
35 +##{{{objectClass: organizationalUnit}}}##
36 +##{{{objectClass: top}}}##
37 +##{{{ou: Services}}}##
38 +## ##
39 +##{{{dn: ou=kerberos,ou=Services,dc=example,dc=com}}}##
40 +##{{{objectClass: organizationalUnit}}}##
41 +##{{{objectClass: top}}}##
42 +##{{{ou: kerberos}}}##
43 +## ##
44 +##{{{dn: uid=kdc,ou=kerberos,ou=Services,dc=example,dc=com}}}##
45 +##{{{uid: kdc}}}##
46 +##{{{objectClass: account}}}##
47 +##{{{objectClass: simpleSecurityObject}}}##
48 +##{{{userPassword: {CRYPT}x}}}##
49 +##{{{description: Kerberos KDC Account}}}##
50 +## ##
51 +##{{{dn: uid=kadmin,ou=kerberos,ou=Services,dc=example,dc=com}}}##
52 +##{{{uid: kadmin}}}##
53 +##{{{objectClass: account}}}##
54 +##{{{objectClass: simpleSecurityObject}}}##
55 +##{{{userPassword: {CRYPT}x}}}##
56 +##{{{description: Kerberos Admin Server Account}}}##
57 +##{{{EOF}}}##
58 +##{{{Enter LDAP Password: SECRET}}}##
59 +## ##
60 +##{{{adding new entry "ou=Services,dc=example,dc=com"}}}##
61 +## ##
62 +##{{{adding new entry "ou=kerberos,ou=Services,dc=example,dc=com"}}}##
63 +## ##
64 +##{{{adding new entry "uid=kdc,ou=kerberos,ou=Services,dc=example,dc=com"}}}##
65 +## ##
66 +##{{{adding new entry "uid=kadmin,ou=kerberos,ou=Services,dc=example,dc=com"}}}##
27 27  
28 -add: olcDbIndex
29 29  
30 -olcDbIndex: krbPrincipalName eq,pres,sub
31 -
32 -EOF
33 -
34 -modifying entry "olcDatabase={1}bdb,cn=config"
35 -
36 -}}}
37 -
38 -
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:
40 -
41 -
42 -{{{# ldapadd -x -D cn=admin,dc=example,dc=com -W <<EOF
43 -dn: ou=Services,dc=example,dc=com
44 -objectClass: organizationalUnit
45 -objectClass: top
46 -ou: Services
47 -
48 -dn: ou=kerberos,ou=Services,dc=example,dc=com
49 -objectClass: organizationalUnit
50 -objectClass: top
51 -ou: kerberos
52 -
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
59 -
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
68 -
69 -adding new entry "ou=Services,dc=example,dc=com"
70 -
71 -adding new entry "ou=kerberos,ou=Services,dc=example,dc=com"
72 -
73 -adding new entry "uid=kdc,ou=kerberos,ou=Services,dc=example,dc=com"
74 -
75 -adding new entry "uid=kadmin,ou=kerberos,ou=Services,dc=example,dc=com"}}}
76 -
77 -
78 78