Changes for page KerberosAndLDAP

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...	...	@@ -22,94 +22,84 @@
22	22	##{{{$ sudo apt install krb5-kdc-ldap krb5-admin-server schema2ldif}}}##
23	23
24	24
25		-=== Load kerberos LDAP schema ===
	25	+=== Load ##kerberos LDAP## schema ===
26	26
27		-Now you need to load the kerberos schema into the LDAP server on the Synology. Use the ##cn=config## DN.
	27	+Now you need to load the kerberos schema into the LDAP server on the Synology. And here you need to use the ##cn=config## DN.
28	28
29	29	(% style="color:#400" %)
30		-##{{{
31		-$ zcat /usr/share/doc/krb5-kdc-ldap/kerberos.openldap.ldif.gz | ldapadd -H ldaps://nas.example.com/ -D cn=config -W
32		-Enter LDAP Password:
33		-adding new entry "cn=kerberos,cn=schema,cn=config"
34		-$
35		-}}}##
	30	+##{{{$ zcat /usr/share/doc/krb5-kdc-ldap/kerberos.openldap.ldif.gz | ldapadd -H ldaps://nas.example.com/ -D cn=config -W}}}##
	31	+##{{{Enter LDAP Password:}}}##
	32	+##{{{adding new entry "cn=kerberos,cn=schema,cn=config"}}}##
	33	+##{{{$}}}##
36	36
37	37
38	38	=== Create Index on krbPrincipalName ===
39	39
40		-Having an index on the ##krbPrincipalName## improves performance. Synology OpenLDAP does not use ##mdb## format, it uses ##bdb##. Debian ##slapd## uses ##mdb## format. It is different database format, but the principle is the same. Again, as you are modifying config, the DN is ##cn=config##. Use the main password you set for the Synology LDAP server. Create a file ##step1.ldif## with the following content:
	38	+Having an index on the ##krbPrincipalName## improves performance and also suppresses some log messages if ##slapd## is configured to log more than default for the database(s) where you intend to store Kerberos data. As this is OpenLDAP on the Synology, it does not use ##mdb## format, it uses ##bdb##. If you install ##slapd## on Debian, it uses ##mdb## format. It is different database format, but the principle is the same. Again, as you are modifying config, the DN is ##cn=config##. Interestingly, it is still the main password you set for the Synology LDAP server.
41	41
42	42	(% style="color:#400" %)
43		-##{{{
44		-dn: olcDatabase={1}bdb,cn=config
45		-add: olcDbIndex
46		-olcDbIndex: krbPrincipalName eq,pres,sub
47		-}}}##
	41	+##{{{$ ldapmodify -H ldaps://nas.example.com/ -D cn=config -W <<EOF}}}##
	42	+##{{{dn: olcDatabase={1}bdb,cn=config}}}##
	43	+##{{{add: olcDbIndex}}}##
	44	+##{{{olcDbIndex: krbPrincipalName eq,pres,sub}}}##
	45	+##{{{EOF}}}##
	46	+##{{{Enter LDAP Password:}}}##
	47	+##{{{modifying entry "olcDatabase={1}bdb,cn=config"}}}##
	48	+##{{{$}}}##
48	48
49		-and apply it with
50	50
51		-(% style="color:#400" %)
52		-##{{{
53		-$ ldapmodify -H ldaps://nas.example.com/ -D cn=config -W -f step1.ldif
54		-Enter LDAP Password:
55		-modifying entry "olcDatabase={1}bdb,cn=config"
56		-$
57		-}}}##
58		-
59		-
60	60	=== Create principals kadmin and kdc ===
61	61
62		-Next, you create and configure two entries which will be used by the Kerberos servers to connect to OpenLDAP. Not running the Kerberos KDC and Admin Server on the same host as OpenLDAP, these steps are required. Keeping things confined, everything will be created under a separate ##organizationalUnit##. My guide differs from the official Debian guide here. Due to Synology OpenLDAP having a strict password policy, it was necessary to adjust the DNs of ##kdc## and ##kadmin##. The official guide use placeholder passwords which does not work with the Synology LDAP server.
63		-Generate the passwords upfront with ##slappasswd -h {SSHA}##. Then create a file ##step2.ldif## with the following content:
	53	+Next, you 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##. I diverge from the official Debian guide here as I do not agree with the DN they use. I also had to make changes to the DNs of ##kdc## and ##kadmin## due to ##pwdPolicy## applied by Synology to their LDAP server. The official guide will have you use placeholder passwords and that does not work with the Synology LDAP server. You need to generate them upfront with ##slappasswd -h {SSHA}##.
64	64
65	65	(% style="color:#400" %)
66		-##{{{
67		-dn: ou=kerberos,dc=example,dc=com
68		-objectClass: organizationalUnit
69		-objectClass: top
70		-ou: kerberos
	56	+##{{{$ ldapadd -H ldap://nas.example.com/ -D uid=root,cn=users,dc=example,dc=com -W <<EOF}}}##
	57	+##{{{dn: ou=kerberos,dc=example,dc=com}}}##
	58	+##{{{objectClass: organizationalUnit}}}##
	59	+##{{{objectClass: top}}}##
	60	+##{{{ou: kerberos}}}##
71	71
72		-dn: cn=kdc,ou=kerberos,dc=example,dc=com
73		-cn: kdc
74		-sn: kdc
75		-objectClass: person
76		-objectClass: pwdPolicy
77		-pwdAttribute: userPassword
78		-pwdMinLength: 8
79		-pwdCheckQuality: 2
80		-pwdPolicySubentry: cn=kdc,ou=kerberos,dc=example,dc=com
81		-userPassword: {SSHA}<password-hash>
82		-description: Kerberos KDC Account
	62	+(% style="color:#400" %)
	63	+##{{{dn: cn=kdc,ou=kerberos,dc=example,dc=com}}}##
	64	+##{{{cn: kdc}}}##
	65	+##{{{sn: kdc}}}##
	66	+##{{{objectClass: person}}}##
	67	+##{{{objectClass: pwdPolicy}}}##
	68	+##{{{pwdAttribute: userPassword}}}##
	69	+##{{{pwdMinLength: 8}}}##
	70	+##{{{pwdCheckQuality: 2}}}##
	71	+##{{{pwdPolicySubentry: cn=kdc,ou=kerberos,dc=example,dc=com}}}##
	72	+##{{{userPassword: {SSHA}<password-hash>}}}##
	73	+##{{{description: Kerberos KDC Account}}}##
83	83
84		-dn: cn=kadmin,ou=kerberos,dc=example,dc=com
85		-cn: kadmin
86		-sn: kadmin
87		-objectClass: person
88		-objectClass: pwdPolicy
89		-pwdAttribute: userPassword
90		-pwdMinLength: 8
91		-pwdCheckQuality: 2
92		-pwdPolicySubentry: cn=kadmin,ou=kerberos,dc=example,dc=com
93		-userPassword: {SSHA}<password-hash>
94		-description: Kerberos KDC Account
95		-}}}##
	75	+(% style="color:#400" %)
	76	+##{{{dn: cn=kadmin,ou=kerberos,dc=example,dc=com}}}##
	77	+##{{{cn: kadmin}}}##
	78	+##{{{sn: kadmin}}}##
	79	+##{{{objectClass: person}}}##
	80	+##{{{objectClass: pwdPolicy}}}##
	81	+##{{{pwdAttribute: userPassword}}}##
	82	+##{{{pwdMinLength: 8}}}##
	83	+##{{{pwdCheckQuality: 2}}}##
	84	+##{{{pwdPolicySubentry: cn=kadmin,ou=kerberos,dc=example,dc=com}}}##
	85	+##{{{userPassword: {SSHA}<password-hash>}}}##
	86	+##{{{description: Kerberos KDC Account}}}##
	87	+##{{{EOF}}}##
	88	+##{{{Enter LDAP Password:}}}##
96	96
97		-Apply it with
	90	+(% style="color:#400" %)
	91	+##{{{adding new entry "ou=kerberos,dc=example,dc=com"}}}##
98	98
99	99	(% style="color:#400" %)
100		-##{{{
101		-$ ldapadd -H ldaps://nas.example.com/ -D uid=root,cn=users,dc=example,dc=com -W -f step2.ldif
102		-Enter LDAP Password:
	94	+##{{{adding new entry "cn=kdc,ou=kerberos,dc=example,dc=com"}}}##
103	103
104		-adding new entry "ou=kerberos,dc=example,dc=com"
	96	+(% style="color:#400" %)
	97	+##{{{adding new entry "cn=kadmin,ou=kerberos,dc=example,dc=com"}}}##
105	105
106		-adding new entry "cn=kdc,ou=kerberos,dc=example,dc=com"
107	107
108		-adding new entry "cn=kadmin,ou=kerberos,dc=example,dc=com"
109		-}}}##
	100	+Synology LDAP server did not like adding users with placeholder passwords, because Synology puts in place password policies. Hence changing this to a ##cn## instead of a ##uid##. It seems to have worked out fine as my KDC is fully functioning.
110	110
111	111
112		-
113	113	=== Grant kdc and kadmin permissions ===
114	114
115	115	This switches back to the ##cn=config## DN as you are changing the permissions.