Changes for page KerberosAndLDAP

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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		-
6	6	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:
7	7
8		-##{{{$ sudo apt install krb5-kdc-ldap krb5-admin-server schema2ldif}}}##
	7	+##$ sudo apt install krb5-kdc-ldap krb5-admin-server schema2ldif##
9	9
10		-
11	11	Then load the ##kerberos## schema:
12	12
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		-##{{{Enter LDAP Password:}}}##
15		-##{{{adding new entry "cn=kerberos,cn=schema,cn=config"}}}##
16		-##{{{$}}}##
	11	+{{{$ 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
17	17
	13	+adding new entry "cn=kerberos,cn=schema,cn=config"
18	18
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##:
	15	+}}}
20	20
21		-##{{{$ 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		-##{{{Enter LDAP Password:}}}##
27		-##{{{modifying entry "olcDatabase={1}bdb,cn=config"}}}##
28		-##{{{$}}}##
29	29
	18	+And add an index on the ##krbPrincipalName## (improves performance and also suppresses some log messages if ##slapd## is configured to log more than default) for the database(s) where you intend to store Kerberos data:
30	30
31		-Next, you need to create and configure two entries which will be used by the Kerberos servers to connect to OpenLDAP. As you will not run the Kerberos KDC and Admin Server on the same host as OpenLDAP, these steps are required. In order to keep things nicely separated, everything will be created under a separate ##organizationalUnit##.
	20	+{{{# ldapmodify -H ldap:~/~/nas.fqhn <<EOF
32	32
33		-##{{{$ 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:}}}##
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"}}}##
	22	+dn: olcDatabase={1}bdb,cn=config
67	67
	24	+add: olcDbIndex
68	68
69		-Now, it was at this point that I had a problem, because the LDAP server on the Synology did not like adding users with placeholder passwords. I ended up working around it using a different construct:
	26	+olcDbIndex: krbPrincipalName eq,pres,sub
70	70
71		-##{{{dn: cn=kadmin,ou=kerberos,ou=Services,dc=example,dc=com}}}##
72		-##{{{sn: kadmin}}}##
73		-##{{{cn: kadmin}}}##
74		-##{{{objectClass: person}}}##
75		-##{{{objectClass: pwdPolicy}}}##
76		-##{{{pwdAttribute: userPassword}}}##
77		-##{{{pwdMinLength: 8}}}##
78		-##{{{pwdCheckQuality: 2}}}##
79		-##{{{pwdPolicySubentry: cn=kadmin,ou=kerberos,ou=Services,dc=example,dc=com}}}##
80		-##{{{userPassword: {SSHA}<hashed password>}}}##
81		-##{{{description: Kerberos Admin Server Account}}}##
	28	+EOF
82	82
83		-and that seems to have worked out fine as my KDC is fully functioning. It required modifying the rest of the guide with the fact that it no longer was ##uid=kadmin## and ##uid=kdc##, but rather ##cn=kadmin## and ##cn=kdc##. The most important thing is that it works.
	30	+modifying entry "olcDatabase={1}bdb,cn=config"
	31	+
	32	+}}}
	33	+
	34	+
	35	+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:
	36	+
	37	+
	38	+{{{# ldapadd -x -D cn=admin,dc=example,dc=com -W <<EOF
	39	+dn: ou=Services,dc=example,dc=com
	40	+objectClass: organizationalUnit
	41	+objectClass: top
	42	+ou: Services
	43	+
	44	+dn: ou=kerberos,ou=Services,dc=example,dc=com
	45	+objectClass: organizationalUnit
	46	+objectClass: top
	47	+ou: kerberos
	48	+
	49	+dn: uid=kdc,ou=kerberos,ou=Services,dc=example,dc=com
	50	+uid: kdc
	51	+objectClass: account
	52	+objectClass: simpleSecurityObject
	53	+userPassword: {CRYPT}x
	54	+description: Kerberos KDC Account
	55	+
	56	+dn: uid=kadmin,ou=kerberos,ou=Services,dc=example,dc=com
	57	+uid: kadmin
	58	+objectClass: account
	59	+objectClass: simpleSecurityObject
	60	+userPassword: {CRYPT}x
	61	+description: Kerberos Admin Server Account
	62	+EOF
	63	+Enter LDAP Password: SECRET
	64	+
	65	+adding new entry "ou=Services,dc=example,dc=com"
	66	+
	67	+adding new entry "ou=kerberos,ou=Services,dc=example,dc=com"
	68	+
	69	+adding new entry "uid=kdc,ou=kerberos,ou=Services,dc=example,dc=com"
	70	+
	71	+adding new entry "uid=kadmin,ou=kerberos,ou=Services,dc=example,dc=com"}}}
	72	+
	73	+
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